COMPACT SELF-SHIELDED IRRADIATION SYSTEM AND METHOD

Abstract

A carousel and first and second members have common axes in a first direction. The carousel, preferably cylindrical, has a ring-shaped configuration defined by inner and outer diameters. The first member has an outer diameter preferably contiguous to the carousel inner diameter. The second member has an inner diameter preferably contiguous to the carousel outer diameter. The carousel is divided into compartments by vanes. The carousel rotates at a substantially constant speed past radiation directed by an accelerator in the first direction. When a fault occurs in the system operation, (1) the carousel and radiation stop and (2) the carousel reverses in direction. When the fault is resolved, the carousel moves in the forward direction at the substantially constant speed and the radiation resumes at the position where the article was being irradiated at the time that the fault occurred. Each article is transferred from a first conveyor into one of the compartments from a position above the compartment and, after being irradiated, is transferred to a second conveyor from the position above the compartment. A cover at the top of the compartment normally covers the compartment. The cover becomes opened to provide for the article transfer into the compartment, remains open during the article irradiation in the compartment and becomes closed after the article transfer to the second conveyor. The leading edge of the article in the compartment is determined to facilitate the article transfer from the compartment after the article irradiation.

Description

[0001] This invention relates to systems for, and methods of, irradiating products, including food products to make them safe to use or eat. More particularly, the invention relates to systems for, and methods of, providing a simplified arrangement in a minimal space and at a minimal cost without any significant sacrifice in the quality of the irradiation provided to the products including food products.

BACKGROUND OF A PREFERRED EMBODIMENT OF THE INVENTION

[0002] It has been known for some time that drugs and medical instruments and implements have to be irradiated so that they will not cause patients to become ill from harmful bacteria when they are applied to the patients. Systems have accordingly been provided for irradiating drugs and medical instruments and implements. The drugs and the medical instruments and implements have then been stored in sterilized packages until they have been ready to be used.

[0003] In recent years, it has been discovered that foods can carry harmful bacteria if they are not processed properly or, even if they are processed properly, that the foods can harbor and foster the proliferation of such harmful bacteria if they are not stored properly or retained under proper environmental conditions such as temperature. Some of the harmful bacteria can even be deadly.

[0004] For example, harmful bacteria have been discovered in recent years in hamburgers prepared by one of the large hamburger chains. Such harmful bacteria have caused a number of purchasers of hamburgers at stores in the chain to become sick. As a result of this incident and several other similar incidents, it is now recommended that hamburgers should be cooked to a well done, or at least a medium, state rather than a medium rare or rare state. Similarly, harmful bacteria have been found to exist in many chickens that are sold to the public. As a result of a number of incidents which have recently occurred, it is now recommended that all chickens should be cooked until no blood is visible in the cooked chickens.

[0005] To prevent incidents such as discussed in the previous paragraphs from occurring, various industries have now started to irradiate foods before the foods are sold to the public. This is true, for example, of hamburgers and chickens. It is also true of fruits, particularly fruits which are imported into the United States from foreign countries.

[0006] In previous years, gamma rays have generally been the preferred medium for irradiating various articles. The gamma rays have been obtained from a suitable material such as cobalt and have been directed to the articles to be irradiated. The use of gamma rays has had certain disadvantages. One disadvantage is that irradiation by gamma rays is slow. Another disadvantage is that irradiation by gamma rays is not precise. This results in part from the fact that the strength of the source (e.g. cobalt) of the gamma rays decreases over a period of time and that the gamma rays cannot be directed in a sharp beam to the articles to be irradiated. This prevents all of the gamma rays from being useful in irradiating the articles.

[0007] In recent years, electron beams have been directed to articles to irradiate the articles. Electron beams have certain advantages over the use of gamma rays to irradiate articles. One advantage is that irradiation by electron beams is fast. For example, a hamburger patty having a square cross section can be instantaneously irradiated by a passage of an electron beam of a particular intensity through the hamburger patty. Another advantage is that irradiation by an electron beam is relatively precise because the strength of the electron beam remains substantially constant even when the electron beam continues to be generated over a long period of time.

[0008] X-rays have also been used to irradiate articles. The x-rays may be formed from electron beams. An advantage in irradiating articles with x-rays is that the articles can be relatively thick. For example, x-rays can irradiate articles which are thicker than the articles which are irradiated by electron beams. A disadvantage is that the x-ray cannot be focused in a sharply defined beam.

[0009] The systems now in use are relatively complicated and relatively expensive and occupy a considerable amount of space. These systems are particularly effective when used at companies requiring radiation of large volumes of products at a particular location. These companies are generally large and have considerable assets. No system apparently exists for irradiating reduced volumes of products at a particular location. No system apparently exists for use by companies of small or medium size.

[0010] In co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) a system and method are disclosed and claimed for irradiating articles in a minimal space, and at a minimal cost, without any significant sacrifice in the quality of the radiation of the articles compared to the irradiation provided in the prior art. The invention disclosed and claimed in the co-pending application is particularly effective for use by companies of small or medium size or where the irradiation of products is only sporadic.

[0011] In co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008), an accelerator provides radiant energy in a first direction. A carousel and first and second members have a common axis in the first direction. The carousel, preferably cylindrical, has a ring-shaped configuration defined by inner and outer diameters. The first member has an outer diameter preferably contiguous to the inner diameter of the carousel. The second member has an inner diameter preferably contiguous to the outer diameter of the carousel. The first and second members provide shielding against the radiant energy from the accelerator.

[0012] A single motor (e.g., a stepping member) rotates the carousel past the radiant energy in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) continuously at a substantially constant speed in successive revolutions. Vanes made from a shielding material are disposed at spaced positions in the carousel to divide the carousel into compartments for receiving the articles and to isolate each compartment against the radiant energy in other compartments.

[0013] A loader in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) loads the articles into compartments before the movement of the articles in the compartments past the radiant energy. An unloader in the co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) unloads the articles from the compartments after the movement of the articles in the compartments past the radiant energy.

[0014] Each article is transferred from a first conveyor into one of the compartments from a position above the compartment and, after being irradiated, is transferred to a second conveyor from the position above the compartment. A cover at the top of the compartment normally covers the compartment. The cover becomes opened to provide for the article transfer into the compartment, remains open during the article irradiation in the compartment and becomes closed after the article transfer to the second conveyor. The leading edge of the article in the compartment is determined to facilitate the article transfer from the compartment.

BRIEF DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

[0015] A carousel and first and second members have common axes in a first direction. The carousel, preferably cylindrical, has a ring-shaped configuration defined by inner and outer diameters. The first member has an outer diameter preferably contiguous to the carousel inner diameter. The second member has an inner diameter preferably contiguous to the carousel outer diameter.

[0016] The carousel is divided into compartments by vanes. The carousel is divided into compartments by vanes. The carousel rotates at a substantially constant speed past radiation directed by an accelerator in the first direction. When a fault occurs in the system operation, the carousel and radiation stop and the carousel reverses in direction. When the fault is resolved, the carousel moves in the forward direction at the substantially constant speed and the radiation resumes at the position where the article was being irradiated at the time that the fault occurred.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the drawings:

[0018] FIG. 1 is a perspective view, as seen from a position above the apparatus, of a preferred embodiment of a system disclosed and claimed in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) for irradiating articles, the preferred embodiment including a rotary carousel, compartments in the carousel and articles in the compartments;

[0019] FIG. 2 is a fragmentary sectional view of the carousel, the compartments and the articles shown in FIG. 1 and of an accelerator for irradiating the articles in the compartments;

[0020] FIG. 3 is a fragmentary perspective view of the carousel shown in FIGS. 1 and 2 and of a stepping motor arrangement for rotating the carousel at a substantially constant speed;

[0021] FIG. 4 is a top plan view of the embodiment shown in FIGS. 1-3 for irradiating articles;

[0022] FIG. 5 is a perspective view of apparatus constituting a preferred embodiment of the invention, as seen from a position above the apparatus, the apparatus including a carousel and members for loading articles into the carousel from a first conveyor before the irradiation of the articles and for unloading articles from the carousel into a second conveyor after the irradiation of the articles and FIG. 5 additionally shows a shutter in a closed position on one of the carousel compartments and other shutters in open positions on others of the compartments;

[0023] FIG. 6 is a top plan view of the apparatus shown in FIG. 5;

[0024] FIG. 7 is a schematic top plan view showing the disposition of an article in the carousel relative to the accelerator upon the occurrence of a fault;

[0025] FIG. 7A shows the voltage applied to a scanner in the accelerator at the time that the fault occurs;

[0026] FIG. 8 is a schematic top plan view similar to that shown in FIG. 7 and shows the disposition of the article in the conveyor relative to the accelerator after the fault has occurred and the carousel has been reversed in position from the position shown in FIG. 7;

[0027] FIG. 8A shows the voltage applied to the accelerator scanner during a reverse movement of the accelerator from the position of the fault;

[0028] FIG. 9 is a schematic top plan view similar to that shown in FIGS. 7 and 8 and shows the disposition of the article in the carousel after the fault has been resolved and the carousel has been moved to the position corresponding in FIG. 7 to the position where the fault has occurred;

[0029] FIG. 9A additionally shows the voltage applied to the scanner at the instant that the accelerator again becomes activated after the fault has been resolved;

[0030] FIG. 10 is a fragmentary schematic plan view of a control system for sensing the position of an article in a compartment so as to provide for a proper operation of the apparatus shown in FIGS. 5 and 6 for removing articles from one of the compartments in the carousel;

[0031] FIG. 11 is an enlarged fragmentary elevational view of an article and members included in the control system shown in FIG. 10 for sensing the position of the leading edge of the article in the compartment during the rotation of the carousel;

[0032] FIG. 12 is a flow chart showing the sequence of steps in transferring an article from a first conveyor into one of the compartments in the carousel;

[0033] FIG. 13 is a flow chart showing the sequence of steps in transferring an article from a compartment in the carousel to a second conveyor after radiant energy has been applied to the article;

[0034] FIG. 14 is a simplified elevational view of the accelerator and shows a scan magnet in the accelerator for receiving a saw tooth voltage which causes an electron beam to be scanned in a direction substantially perpendicular to the direction of movement of the carousel and the direction of the electron beam;

[0035] FIG. 15 is a flow chart showing the sequence of steps in interrupting the operation of the accelerator and the carousel upon the occurrence of a fault and in resuming the operation of the accelerator and the carousel, at the same position on the article as the position on the article upon the occurrence of the fault, after the resolution of the fault and the movement of the accelerator to that position.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

[0036] A system generally indicated at 10 and shown in FIGS. 1-4 is disclosed and claimed in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) assigned of record to the assignee of record of this application. The system shown in FIGS. 1-4 is designated as prior art because it is disclosed in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008). The system is provided for irradiating articles 12. The radiation may be provided by gamma rays, electron beams or x-rays, although electron beams are generally preferred. The articles 12 may be drugs, medical instruments and medical products which are irradiated so that they will not cause patients to become ill from harmful bacteria when they are applied to the patients. The articles 12 may also be different food articles such as meat, poultry, vegetables and fruit, particularly those imported from foreign countries.

[0037] The system 10 includes a carousel 14. The carousel 14 has a ring shape, preferably cylindrical, defined by an axis of rotation and by an inner diameter 16 and an outer diameter 18. The inner and outer diameter 16 and 18 of the carousel 14 are coaxial with the carousel axis of rotation. The carousel is rotatable as by a motor 20, preferably at a substantially constant speed. The motor 20 may be a stepping motor which drives a pinion gear 21 along a rack gear 23 provided in the carousel 14. The rotary movement of the carousel 14 is past radiation from a source or accelerator 22. The radiation from the source or accelerator 22 is in a direction corresponding to the axis of rotation of the carousel 14.

[0038] In the system disclosed and claimed in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008), vanes 24 are disposed in the carousel 14, preferably at spaced intervals in the annular direction around the carousel. The vanes 24 divide the carousel 14 into compartments 26 for receiving the articles 12. The vanes 24 may be made from a suitable material such as a steel or other metal having properties of providing radiation shielding to prevent radiation in one compartment from entering into other compartments. The vanes 24 extend within the carousel 14 between the inner diameter 16 and the outer diameter 18 of the carousel. The vanes 20 particularly provide shielding in each compartment 26 against x-rays.

[0039] A radiation shielding member 28 is disposed within the inner diameter 16 of the carousel 14. The shielding member 28 is stationary and preferably cylindrical and is provided with the same axis as the carousel 14. The radiation shielding member 28 is preferably made from a suitable material such as concrete.

[0040] A radiation shielding member 30 is provided with a hole 32, preferably cylindrical and preferably having an axis corresponding to the axis of rotation of the carousel 14. Preferably the shielding member 30 is contiguous to the outer diameter 18 of the carousel 14. The shielding member 30 may be made from a suitable material such as steel or any suitable metal or from concrete or from a combination of steel and concrete.

[0041] Walls 34 and 36 in the system disclosed and claimed in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) define an opening 38 in the shielding member 30. Preferably the walls 34 and 36 are separated from each other to provide the opening 38 with an angle of approximately 45 degrees. A loading area 40 is provided adjacent the wall 34 to provide for the loading of the articles 12 on the carousel 14. Mechanisms 41 well known in the art may be provided for loading the articles 12 into the compartments 26 from the loading area 40. An unloading area 42 is provided adjacent the wall 36 to provide for the unloading of the articles 12 from the carousel 14 after the articles have been irradiated by the source or accelerator 22. Mechanisms 43 well known in the art may be provided for unloading the articles 12 from the compartments 26 into the unloading area 42.

[0042] The articles 12 are loaded into the compartments 26 at the loading area 40 while the carousel 14 is moved at a substantially constant speed by the stepping member 20. The articles 12 then move at the substantially constant speed past the radiation from the source or accelerator 22. This causes progressive positions in the articles 12 to be irradiated with a substantially constant dosage of radiation. After being irradiated, the articles 12 move at the substantially constant speed to the unloading area 42 where the articles are unloaded from the carousel 14.

[0043] The articles 12 may have irregular shapes. This causes the radiation dosage at progressive positions in the articles 12 to vary dependent upon the thickness of the articles at these positions. application Ser. No. 09/971,986 (Attorneys file 57334) assigned of record to the assignee of record of this application discloses a system for providing fixtures complementary to the irregular configuration of the articles at the progressive position. These fixtures cause the radiation dosage of the articles at progressive positions in the articles to be substantially constant, within acceptable limits, even with irregularities in the configuration of the articles at the progressive positions.

[0044] The system 10 disclosed above and also disclosed and claimed in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) irradiates the articles 12 from only one side of the articles. If it is desired to irradiate the articles 12 from two (2) opposite sides of the articles, the articles may be rotated through an angle of 180 degrees to expose the second side of the articles to radiation from the source or accelerator 22. Alternatively, a second source or accelerator may be disposed on the opposite side of the articles from the source or accelerator 22 to irradiate the second side of the articles. These arrangements are well known in the art.

[0045] The system and method described above and disclosed and claimed in co-pending application Ser. No. 09/971,986 (attorneys file SUREB-58008) have certain important advantages over the prior art. For example, the manufacturing cost and the floor space required by the system is considerably less than is presently being provided. This difference may be by as much as a factor of four (4). Furthermore, the system and method of this invention extend the market to customers who cannot afford the systems now being furnished and offered in the market. Novel and patentable features of this invention include the closed loop ring-shaped carousel, the single motor for driving the carousel at a substantially constant speed, the radiation shielding within the carousel and outside of the carousel and the vanes for dividing the carousel into compartments and for shielding the articles in the compartments against extraneous radiation, particularly x-rays.

[0046] FIGS. 5 and 6 show an improvement in the system of FIGS. 1-4. The improvement shown in FIGS. 5 and 6 constitutes one of the features of this invention. It includes a transfer mechanism, generally indicated at 50, for loading the articles 12 into the carousel 14 from the loading area 40 and a transfer mechanism, generally indicated at 52, for unloading the articles from the carousel 14 and transferring the documents to the unloading area 42. A conveyor generally indicated at 54 (FIG. 6) may be provided for transferring the articles 12 from the loading area 40 to the carousel 14.

[0047] The transfer mechanism 50 includes a beam 56 which extends from a support 58 adjacent the conveyor 54. A translator 60 is disposed on the beam 56 for movement in opposite directions along the beam in accordance with the operation of a motor 62. The operation of the motor 62 is controlled by a microprocessor 64.

[0048] A translator 66 is suitably coupled to the translator 60 for movement upwardly or downwardly on the translator 60 in accordance with the operation of a motor 68. The translator 66 is transverse, preferably perpendicular, to the movement of the translator 60. The operation of the motor 68 is controlled by the microprocessor 64. A gripping mechanism generally indicated at 71 is supported on the translator 66. The gripping member 70 includes a block 72 on which a plurality of vacuum or suction cups 72 are disposed. A vacuum is applied by a vacuum source 74 to the vacuum ducts 72 to provide a gripping action by the cups on one of the articles 12.

[0049] The translator 60 is initially disposed so that the suction cups 72 are disposed adjacent the conveyor 54. A vacuum is applied to the suction cups 72 to provide a gripping action on the article 12 on the conveyor 54. The translator 60 is then driven by the motor 62 along the beam 56 to a position where the cups 72 are disposed above one of the compartments 26 in the carousel 14. This movement is controlled by the microprocessor 64. The vacuum cups 72 are then moved downwardly by the translator 66 to a position where the article 12 is disposed on the floor of the compartment 26. The vacuum in the cups 72 is then released to provide for a separation of the vacuum cups from the article 12 and the vacuum cups are moved upwardly by the translator 66 to a position above the top of the carousel 14. The translator 60 is then moved to the right along the beam 56 until the vacuum cups are disposed adjacent the next one of the articles 12 on the conveyor 54.

[0050] As shown in FIGS. 1, 2 and 5, the accelerator 22 is disposed above the articles 12 on the carousel 14. A plurality of closure members generally indicated at 78 (FIG. 6) are disposed at or near the top of the carousel 14. Each of the closure members 78 is associated with an individual one of the compartment 26 to open the compartment to receive the radiant energy from the accelerator 22 in one operative relationship of the closure member and, in a second operative relationship, to close the compartment 26 against the passage of the radiant energy into the compartment. The closure member 78 may be in the form of a bellows having collapsed and expanded relationships. In the collapsed relationship of the bellows, the compartment 26 is open to receive the radiant energy from the accelerator 22. In the expanded relationship of the bellows, the compartment 26 is closed to prevent the passage of the radiant energy into the compartment. The closure member 78 may be made from a suitable material with resilient and radiation shielding properties. For example, the closure member may be made from a resilient steel.

[0051] The closure member 78 is normally in the closed relationship to prevent radiant energy from entering the associated compartment 26 when there is no article 12 in the compartment. When the article 12 on the conveyor 54 is transferred to an individual one of the compartments 26, the closure member is compressed by a motor 80 to open the compartment. This may preferably occur while the transfer mechanism 50 is moving the article 12 from the conveyor 54 to the individual one of the compartments 26. As will be appreciated, the transfer of the article 12 to the individual one of the compartments 26 occurs before the article in the compartment reaches the radiant energy from the accelerator 22.

[0052] FIG. 12 is a flow chart of the successive steps in transferring one of the articles 12 from the conveyor 54 to the individual one of the compartments 26 and for concurrently opening the closure member 78 in the compartment. As a first step in the process as indicated at 82, the compartment 26 in the carousel 14 is sensed to determine if the compartment is clear so that an article 12 can be disposed in the compartment. If the answer is yes, the position of an article 12 is sensed on the conveyor 54 to determine if the article is properly positioned to be transferred from the conveyor to the empty compartment 26 in the carousel 14. This is indicated at 84 in FIG. 12. For example, the position of the article 12 may be sensed to determine if it is at the end of the conveyor 54.

[0053] If the article is disposed at a particular position such as the end of the conveyor 54, a determination is made as at 86 that the horizontal translator 60 is disposed in a home position above the conveyor 54 with the vertical translator 66 raised. A valve (not shown) in the vacuum source 74 is then opened (see 88) to provide for a vacuum in the suction cups 72. The vertical translator 66 is thereafter moved downwardly (see 90) to a position for grasping the article 12 in the conveyor 54. After a pre-set delay, the vertical translator 66 is moved upwardly to a position where the horizontal translator 60 can move horizontally without interference from the conveyor 54. This is indicated at 92 in FIG. 12.

[0054] The horizontal translator 60 is then actuated to move to a position above the carousel 14 as indicated at 94 in FIG. 12. The closure member or shutter 78 for the pre-selected one of the compartments 26 is thereafter moved (see 96 in FIG. 12) to the open position so that the article 12 can be moved into the pre-selected one of the compartments 26. The vertical translator 66 is then moved downwardly, as indicated at 98, to a particular position such as approximately ¼ inch above the bottom wall of the conveyor 54. The valve in the vacuum pump 74 (which may be a venturi vacuum pump) is then closed, as indicated at 100, to discontinue the operation of the pump and the vacuum cups 72 are operated, as indicated at 102, to eliminate the vacuum in the cups and to impose a compression on the article. The article 12 then becomes disposed on the floor of the carousel 14. The vertical translator 66 and the horizontal translator 60 are then operated sequentially to return the vacuum cups 72 to a home position above the conveyor 54.

[0055] It will be appreciated that the carousel 14 is rotating at a substantially constant speed during the time that the successive steps shown in FIG. 12 and described above take place. The synchronization between the operation of these successive steps and the rotational positions of the carousel is provided by the microprocessor 64. For example, the vertical translator 66 is lowered at a time to deposit the article 12 in the preselected one of the compartments 26 in the carousel 14.

[0056] The transfer mechanism 52 in FIGS. 5 and 6 is constructed in a manner similar to the construction of the transfer mechanism 50. The transfer mechanism 52 includes a beam 104, a horizontal translator 106, a motor 108 for moving the translator 106 horizontally, a vertical translator 112, a motor 114 for moving the translator 112 vertically, a block 116, vacuum cups 118 and the vacuum source 74. The transfer mechanism 52 provides a transfer of the articles 12 from the compartments 26 in the carousel to a conveyor 120 in the unloading area 42 after radiant energy has been applied to the articles. The transfer of the articles 12 from the compartments 26 in the carousel to the conveyor 120 in the unloading area 42 is synchronized by, and under the control of, the microprocessor 64.

[0057] FIG. 13 shows a flow chart similar to that shown in FIG. 12. However, the flow chart shown in FIG. 13 is for the transfer of articles 12 from the carousel 14 to the unloading area 42 where a conveyor 120 is located. The steps in FIG. 13 are performed after the article 12 in an individual one of the carousel compartments 26 has received radiant energy. As a first step indicated at 122, the individual one of the carousel compartments 26 is sensed to determine if one of the articles 12 is in the compartment. If the answer is yes, the conveyor 120 is sensed, as at 124, to determine if the conveyor is clear of any articles 12. If the answer is yes, a determination is made, as at 126, as to whether the horizontal translator 60 is above the conveyor 120 and as to whether the vertical translator 66 is raised above the conveyor. Upon the occurrence of a yes answer, a determination (see 128) is made as to whether the closure member or shutter 78 in the individual one of the carousel compartments is in the open position.

[0058] The horizontal translator 106 is then actuated (see 130) for movement to a position above the carousel 14. The valve in the vacuum source or pump 74 is then opened as at 132 to apply a vacuum to the vacuum cups 72. The vertical translator 134 is then moved downwardly to grasp the article 14 in the individual one of the carousel compartments 26. After a pre-selected delay, the vertical translator 134 is moved upwardly through a sufficient distance to clear the carousel 14. This is indicated at 136. The horizontal translator 116 is thereafter moved to a position above the conveyor 120 (see 138).

[0059] The vertical translator 70 is subsequently lowered (see 140) to a position where the vacuum cups are within a suitable distance (e.g. ¼ inch) above the floor of the carousel 14. The valve in the vacuum source or pump 74 is then closed, as indicated at 142, to discontinue the vacuum in the vacuum source or pump 74. The valve in the vacuum source or pump 74 is then opened (see 144) to apply compressed air to the vacuum cups 72 to insure that the articles 12 move downwardly to the support surface of the conveyor 120. The horizontal translator 60 and the vertical translator 66 are then returned to their home positions above the conveyor 120. This is indicated at 146 in FIG. 12.

[0060] It is desirable to know the position of each article 12 in the individual one of the carousel compartments 26 in which the article is disposed. It is desirable to know the position of the article in the individual one of the compartments so that the microprocessor 64 can coordinate the movement of the translators 106 and 112 with the rotation of the carousel at the substantially constant speed, thereby assuring that the article will be transferred properly from the carousel compartment 26 to the conveyor 120. The apparatus shown in FIGS. 10 and 11 determines the position of each article 12 in the individual one of the carousel compartments 26.

[0061] FIG. 10 is a fragmentary top plan view of the carousel 14 and shows a plurality of successive compartments 26 which are indicated by broken lines 146 as being separated from one another. An energy source (e.g., light source 148) is shown on one side of the carousel as shining light into and through the carousel. A plurality of apertures 150a, 150b and 150c (FIG. 11) are disposed on the opposite side of the carousel at progressive vertical positions in a member 152 displaced from the carousel. This is schematically shown in FIG. 11. The apertures 150a, 150b and 150c are progressively staggered from one another in the direction of rotational movement of the carousel. This direction of rotational movement is indicated at 154 in FIG. 11. Although three (3) apertures are shown in FIG. 11, it will be appreciated that any number of apertures, preferably at least two (2), may be provided in the member 152. A sensing member 153 is disposed on the opposite side of the carousel from the energy source such as the light source 148.

[0062] The carousel 14 is shown in the enlarged elevational view of FIG. 11 by an arrow 154 as rotating in a counterclockwise direction. One of the articles 12 is shown in FIGS. 10 and 11 as being disposed in one of the compartments 26 in the carousel 14. As will be seen from FIG. 11, the article 12 is positioned as progressively blocking light from the light source 148 so that the light is not able to pass through the apertures 150a, 150b and 150c to a sensor 156. The member 152 and the sensor 156 are shown in FIG. 10 as having an arcuate length corresponding to the arcuate length of one of the compartments 26. When the article 12 completely blocks the passage of light through all of the apertures 150a, 150b and 150c, the sensor 156 provides an indication of the position of the article 12 in the compartment. The microprocessor 64 then uses this indication to synchronize the movements of the horizontal translator 106 and the vertical translator 112 (see FIG. 13) with the rotational position of the article 14 in the individual one of the compartments 26 as shown in FIG. 11. As will be appreciated, the inclusion of more than one (1) of the apertures 50 in the staggered relationship provides for an enhanced sensitivity in the determination of the position of the article in the compartment.

[0063] The accelerator 22 is standard and is well known in the art. It provides a beam of electrons which flow downwardly in FIG. 1. It includes a scan magnet 160 which is shown in FIG. 14 and which provides for a scan of the beam in a direction extending into and out of the plane of the paper as the carousel 14 rotates in the direction 154 in FIG. 13. This scan is shown at 161 in FIG. 14 as being to the left and right in that Figure. This scan is provided by applying a cyclic voltage progressively increasing as at 162 to a particular magnitude 164 in a sawtooth waveform in FIGS. 7A and 9A, then decreasing instantaneously to zero and then progressively increasing in the sawtooth waveform 162 to the particular magnitude 164. The scan magnet 160 bends the electron beam into and out of the plane of the paper in FIG. 13 and to the left and right in FIG. 14 at each instant through an angle dependent upon the magnitude of the voltage applied to the scan magnet at that instant. The accelerator 22 also includes a bar magnet 166 (FIG. 14) which adjusts the angle of the electron beam so that the electron beam extends vertically downward in FIG. 1.

[0064] The rotational speed of the carousel 14 may be sensed at each instant and the speed may be adjusted in a servo loop so that the speed remains substantially constant. Furthermore, the magnitude of the voltage applied to the scan magnet 160 increases linearly in each cycle at a substantially constant rate. In this way, the position at each instant of the radiant energy beam in the scan direction may be precisely determined.

[0065] At some time, a fault may occur in the operation of the system shown in the drawings and described above. For example, one of the motors 62, 68, 80, 108 and 114 in the system (FIG. 6) may become completely or partially inoperative or the valve in the vacuum source 74 may become stuck. When a fault occurs, the operation of the accelerator 22 is discontinued and the rotary movement of the carousel 14 is simultaneously discontinued. A record is provided in the microprocessor 64 of the position of the carousel 14 relative to the accelerator 22 in the direction 154 in FIG. 11 at the occurrence of the fault. A record is also provided in the microprocessor 64 of the magnitude of the voltage introduced to the scan magnet 160 at the occurrence of the fault. This voltage magnitude is illustratively shown at 168 in FIG. 7A. The fault is schematically illustrated at 170 in FIGS. 7 and 9. The magnitude of the voltage applied to the scan magnet 160 at the time of the fault is indicated at 168 in FIGS. 7A and 9A.

[0066] After a slight delay to make certain that the movement of the carousel 14 in the direction 154 in FIG. 11 has stopped and that the accelerator 22 is not operative, the direction of rotation of the carousel 14 is reversed from the direction 154 shown in FIG. 1 1. The article 12 is then moved in a reverse direction (clockwise in FIG. 8) to a position indicated in broken lines at 12 in FIG. 8. As will be seen, the article 12 is now displaced from the fault 166 by a distance in a direction opposite to the normal direction 154 of movement of the article with the carousel. This distance is sufficiently great that the carousel can be accelerated to reach the substantially constant speed in the forward (counterclockwise in FIGS. 7-9) direction before the article reaches the position 170 of the fault. When the carousel 14 moves in the reverse (clockwise in FIG. 8) direction, it generates a voltage 174 which extends progressively on a cyclic basis from the particular magnitude 164 to a zero magnitude and then rises instantaneously to the particular magnitude for another progressive decrease to a zero (0) value.

[0067] When the fault has become positively resolved so that the system shown in the drawings and described above is again fully operative, the generation of the voltage 162 in FIG. 7A is restored and rotational movement of the carousel 14 in the direction 154 (FIG. 11) is resumed. This is shown in FIG. 9A by the voltage wave form 162 in broken lines until the particular magnitude 164 is provided after the clearance of the fault. The carousel 14 is accelerated in the direction 154 (FIG. 11) to reach the substantially constant speed before the carousel reaches the fault position 170. When the magnitude of the generated voltage reaches the level 168 in FIG. 9A, the voltage is applied to the scan magnet 160. In this way, the scanning in the direction into and out of the plane of the paper in FIG. 11 is resumed at the position where the scan was interrupted at the occurrence of the fault. A substantially constant voltage is accordingly applied to the article 12 at every position in the article even though a fault has occurred during the movement of the article on the carousel.

[0068] FIG. 15 is a flow chart showing the operation of the system 10 when a fault occurs. As a first step during the normal operation of the carousel 14, the speed of the carousel is sensed by redundant systems on the carousel 14. This is indicated at 180 in FIG. 14. As shown at 182 in FIG. 15, a feedback loop in the system 10 automatically adjusts the voltage of the stepping motor 20 to a substantially constant magnitude so that the carousel rotates at a substantially constant speed. If and when a fault such as 170 occurs, a pulse is skipped (see 184) to provide time for the carousel 14 to stop and the accelerator 22 to become de-energized. The fault is detected by monitoring the system 10 for the occurrence of the fault as indicated at 186.

[0069] After the pulse is skipped, the position of the carousel 14 is determined at the time of the fault (see 188). This may be accomplished by providing a start position for the carousel rotation and by counting the number of steps taken by the stepping motor from the start position. The voltage applied to the scan magnet 160 at the time of occurrence of the fault is also determined as indicated at 190. The movement of the carousel 14 is stopped as indicated at 192, and the operation of the accelerator 122 is also discontinued at the occurrence of the fault as indicated at 193. The carousel is then reversed in direction as shown in FIG. 8 and at 194 in FIG. 15 and the carousel 14 is moved through a particular distance. This distance provides for a subsequent movement of the carousel in a forward direction (154 in FIG. 11) at the substantially constant speed past the position at which the fault occurred. The movement of the carousel 14 in the reverse direction is indicated in FIGS. 8A and 8B.

[0070] When the fault is cleared or resolved, the rotational direction of the carousel 14 is again reversed so that the carousel now moves in the forward direction 154 in FIG. 11. The carousel 14 is then accelerated to the substantially constant speed in the forward direction 154. This speed is monitored as indicated at 182 and 198 so that the carousel is rotating at the substantially constant speed when the carousel reaches the position where the fault occurred. At this time, the power supply for the scan magnet 160 is set at the same voltage that the power supply had when the fault occurred. This voltage is indicated at 168 in FIGS. 7A and 9A. The accelerator 22 is then energized to apply radiant energy to the article 12. In this way, the article 12 is provided with radiant energy of a particular magnitude at every position just as if no fault has occurred.

[0071] Although this invention has been disclosed and illustrated with reference to particular embodiments, the principles involved are susceptible for use in numerous other embodiments which will be apparent to persons of ordinary skill in the art. The invention is, therefore, to be limited only as indicated by the scope of the appended claims.

Claims

1. In combination for applying radiant energy to articles,

an accelerator for providing the radiant energy in a first direction,

an annular carousel for rotating the articles past the radiant energy from the accelerator on an axis corresponding to the first direction,

a loading mechanism for disposing the articles into the carousel for a rotary movement of the articles with the carousel past the radiant energy from the accelerator,

members in the carousel for dividing the carousel into compartments for receiving the articles,

a sensing system including a microprocessor for determining the positions of the articles in the receptacles, and

a transfer mechanism responsive to the determination by the sensing system of the position of the articles in the compartments for removing the articles from the carousel after the irradiation of the articles.

2. In a combination as set forth in claim 1,

the members constituting vanes disposed in the carousel at spaced intervals around the carousel for dividing the carousel into compartments for receiving the articles,

the transfer mechanism including a first member for lifting the articles from the carousel after the irradiation of the articles, and

the transfer mechanism including at least a second member responsive to the lifting of the articles from the container for moving the articles to a particular position displaced from the carousel.

3. In a combination as set forth in claim 1,

the carousel having an annular opening at the center of the carousel, and

material disposed in the annular opening for providing a shielding against the radiant energy from the accelerator,

the transfer mechanism including suction cups for producing a vacuum force to hold the articles after the movement of the transfer mechanism to the articles and for moving the articles from the carousel to the particular position.

4. In a combination as set forth in claim 3,

the members constituting vanes disposed in the carousel at spaced intervals around the carousel for dividing the carousel into compartments for receiving the articles, the vanes being made from a material providing a shielding in each compartment against radiant energy from adjacent compartments,

the transfer mechanism including the suction cups being operative, with the suction cups and the articles being responsive to a vacuum, to lift the articles from the carousel to move the articles to the particular position,

the transfer mechanism being further operative to remove the vacuum from the suction cups to provide for a separation of articles from the suction cups after the movement of the articles to the particular position.

5. In a compartment as set forth in claim 2,

material disposed exterior to the carousel for providing shielding against radiant energy from the carousel and from the accelerator,

the first and second members being coupled to each other and to the suction cups for a movement of the suction cups in accordance with the movements of the first and second members.

6. In combination for applying radiant energy to articles,

an accelerator for providing the radiant energy in a first direction,

a carousel having a ring-shaped configuration with inner and outer dimensions and rotatable past the radiant energy from the accelerator at a particular speed on an axis extending in the first direction,

first material having the particular axis and having an outer dimension substantially corresponding to the inner dimension of the carousel and having properties of providing shielding against the radiant energy from the accelerator,

second material having the particular axis and having an inner dimension substantially conforming to the outer dimension of the carousel and having properties of providing shielding against the radiant energy from the accelerator,

an unloading area,

the carousel being divided into compartments each constructed to hold at least one of the articles, and

sensing apparatus disposed relative to the carousel for determining the position of the articles in the compartments, and

a transfer mechanism responsive to the determination by the sensing apparatus for providing for a transfer of the articles from the compartments to the unloading area during the rotation of the articles at the particular speed.

7. In a combination as set forth in claim 6,

the carousel having an annular configuration and the first material having an annular configuration and being disposed within the annular configuration of the carousel and the second material having an annular configuration and the carousel being disposed within the annular configuration of the second material,

the carousel defining a loop centered on the particular axis,

the first material defining a closed loop centered on the particular axis,

the second material defining a closed loop centered on the particular axis,

the transfer mechanism being movable on a pair of axes substantially perpendicular to each other to raise the article from the compartment on the first axis, move the article on the second axis to the unloading area and lower the article to the unloading area on the second axis.

8. In a combination as set forth in claim 6,

a loading area for providing for a disposition of the articles in the carousel for a rotary movement of the articles with the carousel past the radiant energy from the accelerator,

the unloading area providing for a removal of the articles from the carousel after the movement of the articles with the carousel past the radiation energy from the accelerator, and

a plurality of covers each associated with an individual one of the compartments and each movable between open and closed positions in the individual one of the compartments, and each movable to the open position upon the disposition of one of the articles in the individual one of the compartments and each movable to the closed position upon a lack of disposition of one of the articles in the individual one of the compartments.

9. In a combination as set forth in claim 6 wherein

a loading area is disposed to provide for a disposition of the articles in the carousel for a rotary movement of the articles with the carousel past the radiant energy from the accelerator and wherein

a second transfer mechanism is provided for holding the articles and for moving the articles from the loading area to the carousel during the movement of the carousel at the particular speed.

10. In a combination as set forth in claim 6 wherein

the top of the carousel is open and wherein

a plurality of covers are made from a radiation shielding material, each of the covers being disposed at the top of an individual one of the compartments and each being movable between an open position and a closed position and each being movable to the open disposition upon a disposition of one of the articles in the individual one of the compartments and each being movable to the closed position upon a lack of a disposition of one of the articles in the individual one of the compartments and wherein

the transfer mechanism is responsive to the determination of the position of the articles in the compartment for lifting the articles from the compartments after the application of the radiant energy to the articles in the compartments and is movable to the unloading area for transferring the articles to the unloading area.

11. In combination for applying radiant energy to articles,

a carousel having a hollow configuration and movable continuously in a loop at a substantially constant speed, the carousel defining compartments for holding the articles for movement with the carousel,

an accelerator disposed relative to the carousel to provide radiant energy to the articles in the carousel during the movement of the carousel continuously at the substantially constant speed in the closed loop,

a first member disposed within the hollow configuration of the carousel and having the configuration of the loop and having properties of shielding against the radiant energy from the accelerator,

a second member disposed externally of the carousel and having the configuration of the loop and having properties of shielding against the radiant energy from the accelerator,

a motor for driving the carousel in a first direction, and

a control system for detecting a fault, for stopping the motor upon the detection of the fault, for reversing the motor after the stoppage of the motor and for resuming the operation of the motor in the first direction upon a clearing of the fault.

12. In a combination as set forth in claim 11,

the motor being operative to drive the carousel at a substantially constant speed in the first direction in the closed loop,

the control system being operative to detect the position of the carousel upon the occurrence of the fault,

the control system being responsive to the detection of the fault for interrupting the operation of the accelerator and being responsive to a resumption in the movement of the carousel at the substantially constant speed in the first direction at the detected fault position for resuming the operation of the accelerator.

13. In a combination as set forth in claim 11 wherein

the carousel, the first member and the second member are disposed on a common axis and wherein

the beam is scanned in a second direction substantially perpendicular to the first direction and wherein

the control system is operative to detect the position of the scan of the beam by the accelerator at the time of the occurrence of the fault and is operative to resume the scan of the beam at the detected scan position when the motor has moved the carousel in the first direction to the detected scan position.

14. In a combination as set forth in claim 12 wherein

the control system is operative to reverse the direction of the motor from the first direction upon the occurrence of the fault and for resuming the operation of the motor in the first direction upon a clearance of the fault and for providing for an operation of the motor at the substantially constant speed in the first direction at the detected scan position.

15. In a combination as set forth in claim 14 wherein

the carousel, the first member and the second member are disposed on a common axis and wherein

the beam is scanned in a second direction substantially perpendicular to the first direction and wherein

the control system is operative to detect the position of the scan by the accelerator at the time of the occurrence of the fault and is operative to resume the scan at the detected scan position when the motor has moved the carousel in the first direction to the detected scan position after the fault has been cleared.

16. In a combination for applying radiant energy to an article,

a carousel having a hollow configuration and movable in a loop, the carousel defining compartments for holding the articles for movement with the carousel,

an accelerator disposed relative to the carousel to provide radiant energy to the articles in the carousel during the movement of the carousel in the loop,

a first member disposed within the hollow configuration of the carousel and having the configuration of the loop and having properties of shielding against the radiant energy from the accelerator,

a second member disposed externally of the carousel and having the configuration of the loop and having properties of shielding against the radiant energy from the accelerator,

a motor for driving the carousel in the loop, and

a control system responsive to the occurrence of a fault for interrupting the operation of the motor and the accelerator in providing for an irradiation of article in the carousel and for thereafter positioning the carousel to obtain a resumption of the irradiation of the article at the position in the article where the irradiation has been interrupted by the occurrence of the fault.

17. In a combination as set forth in claim 16 wherein

the carousel, the first member and the second member are disposed on a common axis and wherein

the carousel, the first member and the second member are disposed in a common plane and wherein

the motor is initially operated to move the carousel in a first direction until the occurrence of the fault and is then operated to reverse the direction of movement of the carousel and is subsequently operated to move the carousel in the first direction past the position of the fault after the fault has been cleared.

18. In a combination asset forth in claim 17 wherein

the control system provides for an interruption in the operation of the accelerator upon the occurrence of the fault and provides for a resumption in the operation of the accelerator upon the clearance of the fault.

19. In a combination as set forth in claim 16,

a first transfer mechanism disposed in a spaced relationship to the carousel for providing for a transfer of articles to the carousel for introduction of the radiant energy to the articles without interrupting the movement of the carousel,

a second transfer mechanism disposed in a spaced relationship to the carousel for providing for a transfer of the articles from the carousel after the provision of the radiant energy to the articles without interrupting the movement of the carousel.

20. In a combination as set forth in claim 16 wherein

the control system detects the position of the carousel upon the occurrence of the fault and wherein

the radiant energy from the accelerator is applied to the article until the occurrence of the fault and then remains interrupted during the reversal in the movement of the carousel after the occurrence of the fault and is subsequently provided, after the clearance of the fault, upon the movement of the carousel in the first direction at the substantially constant speed to the detected position of the carousel at the occurrence of the fault.

21. In a mechanism as set forth in claim 20,

a loading area disposed in a spaced relationship to the carousel for providing for a transfer of articles to the carousel for introduction of radiant energy to the articles without interrupting the movement of the carousel,

a first mechanism disposed in the loading area and controlled by the control system for transferring the articles from the loading area to the carousel,

an unloading area disposed in a spaced relationship to the carousel and the loading area for providing for a transfer of the articles from the carousel after the provision of the radiant energy to the articles without interrupting the movement of the carousel, and

a second carousel disposed in the unloading area and controlled by the control system for transferring the articles from the carousel to the unloading area after the irradiation of the articles.

22. In a combination for applying radiant energy to articles,

a carousel having a hollow configuration and movable in a loop and constructed to receive and hold the articles for movement of the articles in the loop,

a first member disposed within the hollow configuration of the carousel and having the configuration of the loop and having properties of providing radiation shielding,

a second member disposed externally of the carousel and having the configuration of the loop and having properties of providing radiation shielding,

an accelerator for irradiating the articles with a radiation beam substantially perpendicular to the direction of movement of the articles, the accelerator providing a scan of the articles in a direction substantially perpendicular to the direction of movement of the articles and to the direction of the beam, and

a control system responsive to a fault for interrupting the movement of the carousel and the provision of the radiation beam, the control system being operative, upon the clearance of the fault, to resume the irradiation of the article at the position of the article, including the position of the scan of the article, where the fault occurred.

23. In a combination as set forth in claim 22,

the control system being operative to move the carousel in a first direction past the radiation from the accelerator and, upon the occurrence of the fault, to reverse the article movement to a second direction, opposite to the first direction, from the article position upon the occurrence of the fault and, upon the clearance of the fault, being operative to move the article in the first direction past the position of the fault and to resume the application of the radiant energy from the accelerator at the position of the carousel upon the occurrence of the fault and at the position of the radiation in the scan direction upon the occurrence of the fault.

24. In a combination as set forth in claim 22,

the carousel being movable at a substantially constant speed in the first direction before the occurrence of the fault and the carousel being movable at the substantially constant speed in the first direction upon the resumption of the radiation after the clearance of the fault.

25. In a combination as set forth in claim 24,

an unloading area for removing the articles from the carousel after the irradiation of the articles in the carousel,

the control system being operative to locate the position of the articles in the carousel after the irradiation of the articles, and

a mechanism for transferring the articles from the carousel to the unloading area upon the location of the articles in the carousel.

26. In a combination as set forth in claim 23,

the carousel being movable at a substantially constant speed in the first direction before the occurrence of the fault and the carousel being movable at the substantially constant speed in the first direction upon the resumption of the application of the radiant energy after the clearance of the fault,

an unloading area for removing the articles from the carousel after the irradiation of the articles in the carousel,

the control system being operative to locate the position of the articles in the carousel after the irradiation of the articles, and

a mechanism for transferring the articles from the carousel to the unloading area upon the location of the articles in the carousel.

27. In combination for applying radiant energy to articles,

an accelerator for providing radiant energy in a particular direction,

a carousel movable past the radiant energy from the accelerator,

a plurality of vanes disposed at spaced positions in the carousel to divide the carousel into compartments for receiving the articles, the vanes being made from a material providing a shielding against the radiant energy from the accelerator,

closures disposed on the carousel and made from radiation shielding material, each closure being movable on the carousel between an open position providing for an irradiation of an article in an individual one of the compartments and a closed position preventing the direction of radiation into the individual one of the compartments, and

a control system for normally providing for a disposition of each of the closures in the closed position and for a movement of each of the closures to the open position in accordance with a disposition of one of the articles in the individual one of the compartments.

28. In combination as set forth in claim 27,

a loading area,

an unloading area,

the control system being operative to provide for a movement of articles from the loading area to the compartments in the carousel and to provide for a movement of the closures in the compartments to the open position in accordance with a disposition of the articles in the compartments and being operative to provide for a movement of the articles from the compartments to the unloading area upon an application of radiant energy to the articles and to close the compartments upon the movement of the articles from the compartments.

29. In combination as set forth in claim 27 wherein

the control system is operative to provide for an opening of one of the closures for an insertion of one of the articles into the individual one of the compartments and to provide for a closing of the closure upon an application of radiant energy to the article in the individual one of the compartments and a withdrawal of the article from the individual one of the compartments.

30. In a combination asset forth in claim 27,

a conveyor,

the control system including a vacuum source and vacuum cups responsive to the vacuum from the source for holding the articles during the movement of the articles between the conveyor and the individual one of the compartments in the carousel.

31. In a combination as set forth in claim 27 wherein

the control system is operative to provide for an opening of the closure for an insertion of one of the articles into the individual one of the compartments and to provide for a closing of the closure upon an irradiation of the article in the individual one of the compartments and a withdrawal of the article from the individual one of the compartments,

a conveyor, and

the control system including a vacuum source and vacuum cups responsive to the vacuum from the source for holding the articles during the movement of the articles between the conveyor and the individual one of the compartments in the carousel.

32. In combination for applying radiant energy to articles,

an accelerator for providing radiant energy in a particular direction,

a carousel rotatable past the radiant energy from the accelerator,

a plurality of vanes disposed at spaced positions in the carousel to divide the carousel into compartments for receiving the articles, the vanes being made from a material providing a shielding against the radiant energy from the accelerator,

a loading mechanism for loading the articles into the compartments before the movement of the compartments past the radiant energy,

an unloading mechanism for unloading the articles from the compartments after the movement of the articles with the carousel past the radiant energy from the accelerator, and

a sensor mechanism for determining the position of the articles in the compartments to provide for a control of the operation of the unloader mechanism in unloading the articles from the compartments in the carousel after the irradiation of the articles in the compartments.

33. In a combination as set forth in claim 32 wherein

the articles are movable continuously in the carousel at a substantially constant speed past the radiant energy from the accelerator, and then to the unloading mechanism and wherein

the unloading mechanism is responsive to the determination of the position of the articles in the compartments for unloading the articles from the carousel.

34. In a combination as set forth in claim 33 wherein

a conveyor is provided for receiving the articles from the unloading mechanism and for conveying the articles from the carousel and wherein

the unloading mechanisms includes a first sub-assembly for moving the articles between the carousel and the conveyor and includes a second sub-assembly for lifting the articles from the carousel and depositing the articles on the conveyor.

35. In a combination as set forth in claim 34 wherein

the second sub-assembly includes vacuum cups for removing the articles from the carousel and for depositing the articles in the conveyor and wherein

a vacuum pump is operative on the vacuum cups to remove articles from the carousel and deposit the article in the conveyor.

36. In a combination for applying radiant energy to articles,

a carousel constructed to hold articles and movable in a loop,

an accelerator for applying radiant energy to the articles during the movement of the carousel in the loop,

a plurality of vanes disposed in spaced relationship to one another in the carousel for defining compartments in the carousel,

a loading area displaced from the carousel for providing for the transfer of the articles into the compartments in the carousel, and

a transfer mechanism for moving the articles in a first direction from the loading area to the carousel and for depositing the articles into the compartments in a second direction transverse to the first direction.

37. In a combination as set forth in claim 36,

the transfer mechanism being operative, after the transfer of the articles into the compartments, to move in a third direction opposite to the second direction, and then to move in a fourth direction opposite to the first direction to return to the loading area.

38. In a combination as set forth in claim 36,

suction cups for holding the articles during the movement of the articles in the first and second directions, and

a vacuum pump for producing a vacuum in the suction cups during the movement of the articles in the first and second directions.

39. In a combination as set forth in claim 36,

the carousel having a doughnut-shaped configuration,

first radiating shielding material within the doughnut-shaped configuration,

second radiation shielding material enveloping the doughnut-shaped configuration, and

the vanes being made from radiation shielding material to limit the passage of radiation between the compartments.

40. In a combination as set forth in claim 39,

the transfer mechanism being operative, after the transfer of the articles into the compartments, to move in a third direction opposite to the second direction, and then to move in a fourth direction opposite to the first direction to return to the loading area,

suction cups for holding the articles during the movement of the articles in the first and second directions, and

a vacuum pump for producing a vacuum in the suction cups during the movement of the articles in the first and second directions.

41. In a combination for applying radiant energy to articles,

a carousel constructed to hold the articles and movable in a loop,

an accelerator for applying radiant energy to the articles during the movement of the articles in the loop,

a plurality of vanes disposed in spaced relationship to one another in the carousel for defining compartments in the carousel,

an unloading area displaced from the carousel for providing for a transfer of articles from the compartments to the unloading area after the application of the radiant energy to the articles, and

a transfer mechanism for moving the articles in a first direction from the carousel to the unloading area and for depositing the articles in the unloading area in a second direction transverse to the first direction.

42. In a combination as set forth in claim 41,

the transfer mechanism being initially disposed in the unloading area and being movable in a third direction opposite to the first direction to move to a position above the carousel during the movement of the carousel in the loop and being then movable in a fourth direction opposite to the second direction to receive the articles in the carousel.

43. In a combination as set forth in claim 41,

suction cups for holding the articles during the movement of the articles in the first and second directions from the carousel to the unloading area, and

a vacuum pump for producing a vacuum in the suction cups during the movement of the articles in the first and second directions.

44. In a combination as set forth in claim 41,

the carousel having a doughnut-shaped configuration,

first radiating shielding material within the doughnut,

second radiation shielding enveloping the doughnut-shaped configuration on the outside of the doughnut shape, and

the vanes being made from radiation shielding material to limit the passage of radiation between the compartments.

45. In a combination as set forth in claim 44,

the transfer mechanism being initially disposed in the unloading area and being movable in a third direction opposite to the first direction to move to a position above the carousel during the movement of the carousel in the loop and being then movable in a fourth direction opposite to the second direction to receive the articles in the carousel,

suction cups for holding the articles during the movement of the articles in the first and second directions from the carousel to the unloading area, and

a vacuum pump for producing a vacuum in the suction cups during the movement of the articles in the first and second directions.

46. In a combination as set forth in claim 45,

the carousel being rotatable at a particular speed on a particular axis,

the radiation being provided in a direction corresponding to the particular axis, and

the second and fourth directions being substantially parallel to the particular axis.

47. In combination for applying radiant energy to articles,

a carousel movable in a loop and constructed to hold articles,

an accelerator for applying radiant energy to the articles in the carousel during this movement of the carousel,

vanes disposed at spaced positions in the carousel to define compartments in the carousel,

cover members disposed on the carousel and each movable between a first position for opening an individual one of the compartments to the application of radiant energy from the accelerator and a second position for closing the individual one of the compartments against the application of radiant energy, and

a control system for moving each of the closure members between the open and closed positions in accordance with the disposition, or lack of disposition, of one of the articles in the individual one of the compartments.

48. In a combination as set forth in claim 47,

the control system being operative to move each of the closure members to the open position upon a disposition of one of the articles in the individual one of the compartments and to move each of the closure members to the closed disposition upon a lack of a disposition of one of the articles in the individual one of the compartments.

49. In a combination as set forth in claim 47,

a loading area for holding articles, and

a transfer mechanism for transferring articles from the loading area into the individual ones of the compartments,

the control system being responsive to the transfer of the articles into the compartments for opening the closure members in the compartment to the passage of the radiant energy into the compartment.

50. In a combination as set forth in claim 47,

an unloading area for holding articles, and

a transfer mechanism for transferring articles from the individual ones of the compartments to the loading area,

the control system being responsive to the transfer of the articles from the individual ones of the compartments for closing the individual ones of the compartments against the passage of the radiant energy into the compartments.

51. In a combination as set forth in claim 47,

the control system being operative to move each of the closure members to the open position upon a disposition of one of the articles in the individual one of the compartments and to move each of the closure members to the closed position upon a lack of a disposition of one of the articles in the individual one of the compartments,

a loading area for holding articles, and

a transfer mechanism for transferring articles from the loading area into the individual ones of the compartments,

the control system being responsive to the transfer of the articles into the compartments for opening the closure members in the compartments to the passage of the radiant energy into the compartment.

52. In combination for applying radiant energy to articles,

a carousel constructed to move articles in a loop,

an accelerator for applying radiant energy to the articles in the carousel,

a plurality of vanes for dividing the carousel into compartments,

a sensor mechanism disposed relative to the carousel for sensing the positions of the articles in the compartments after the application of the radiant energy to the articles,

an unloading area, and

a transfer mechanism responsive to the sensing of the position of the position of the articles in the carousel compartments for providing for the transfer of the irradiated articles from the compartments to the unloading area.

53. In a combination as set forth in claim 52 wherein

the carousel has a ring-shaped configuration defined by inner and outer diameters and wherein

a light source is disposed on one side of the ring-shaped configuration to pass light through the carousel and wherein

apertures are provided on the other side of the ring-shaped configuration to receive the light from the light source through the apertures when one of the articles is not disposed in an individual one of the compartments and the apertures are blocked from the light source when one of the articles is disposed in the individual one of the compartments.

54. In a combination as set forth in claim 52,

a conveyor disposed relative to the transfer mechanism for receiving the articles transferred by the transfer mechanism from the carousel.

55. In a combination as set forth in claim 54 wherein

the transfer mechanism provides a movement of the articles upwardly from the carousel in a first direction, and then horizontally in a second direction, to transfer the articles from the carousel to the conveyor.

56. In a combination as set forth in claim 55,

the carousel has a ring-shaped configuration defined by inner and outer diameters and wherein

a light source is disposed on one side of the ring-shaped configuration to pass light through the carousel and wherein

apertures are provided on the other side of the ring-shaped configuration to receive the light from the light source through the apertures when one of the articles is not disposed in an individual one of the compartments and the apertures are blocked by the light source when one of the articles is disposed in the individual one of the compartments.

57. In a method of applying radiant energy to articles, the steps of

rotating a compartmentalized carousel in a loop, there being articles in the compartments,

applying the radiant energy to the articles in the compartments during the rotation of the compartments,

providing an unloading area,

determining the position of the articles in the compartments, and

grasping the articles in the compartments, during the rotation of the carousel, in accordance with the determination of the positions of the articles in the compartments, and

transferring the grasped articles to the unloading area.

58. In a method as set forth in claim 57 wherein

the transferring step includes the step of initially lifting the articles from the compartments to positions above the compartments and then moving the articles horizontally to the unloading area.

59. In a method as set forth in claim 57, the steps of

applying a vacuum force to the articles in the compartments to provide for the transfer of the articles from the compartments to the unloading area, and

releasing the vacuum force on the articles when the articles have been transferred to the unloading area.

60. In a method as set forth in claim 57, the step of:

determining the positions of the articles in the compartments includes the steps of directing light through apertures in the compartments and determine when during the rotation of the carousel, the articles in the compartments block the passage of the light through the compartments.

61. In a method as set forth in claim 58, including the steps of:

applying a vacuum force to the articles in the compartments to provide for the transfer of the articles from the compartments to the unloading area,

releasing the vacuum force on the articles when the articles have been transferred to the unloading area, and

determining the positions of the articles in the compartments by directing light through apertures in the compartments to determine when, during the rotation of the carousel, the articles in the compartments block the passage of the light through the compartments.

62. In a method of applying radiant energy to articles, the steps of:

providing compartments in a carousel,

rotating the carousel in a loop on a particular axis,

applying radiant energy to the carousel in the direction of the particular axis during the rotation of the carousel, and

determining the positions of the articles in the compartments during the rotation of the carousel.

63. In a method as set forth in claim 62 wherein

the carousel has a ring-shaped configuration with inner and outer diameters and wherein

first radiation shielding material having a diameter less than the first diameter is disposed within the ring defined by the carousel and wherein

second radiation shielding material having a diameter greater than the second diameter is disposed in enveloping relationship to the ring defined by the carousel and wherein

the position of the articles in the compartments is determined by disposing a light source within the ring defined by the carousel, and disposing sensors outside of the ring defined by the carousel at positions after the application of the radiant energy to the articles, for receiving the light passing through the carousel from the source.

64. In a method as set forth in claim 63 wherein

apertures are provided in a member on the opposite side of the ring from the light source to pass the light from the source when the articles are not disposed between the light source and the sensor and to block the passage of the light to the sensor when the articles are disposed between the light source and the sensor.

65. In a method as set forth in claim 62 wherein

the carousel is rotated at a substantially constant speed and wherein

the articles are removed from the compartments in the carousel in accordance with the determination of the positions of the articles in the compartments and wherein

the articles are transferred to a conveyor after their removal from the compartments in the carousel.

66. In a method as set forth in claim 63 wherein

apertures are provided in a member on the opposite side of the ring from the light source to pass the light when the articles are not disposed between the light source and the sensor and to block the passage of the light to the sensor when the articles are disposed between the light source and the sensor and wherein

the carousel is rotated at a substantially constant speed and wherein

the articles are removed from the compartments in the carousel in accordance with the determination of the positions of the articles in the compartments and wherein

the articles are transferred to a conveyor after their removal from the compartments in the carousel.

67. In a method of applying radiant energy to articles, the steps of:

rotating a carousel in a loop,

providing compartments in the carousel for receiving the articles,

applying radiant energy to the articles in the carousel during the rotation of the carousel,

providing a transfer of the articles into the carousel from a loading area for movement of the articles with the carousel past a position for applying the radiant energy to the articles,

providing a transfer of the articles from the carousel to an unloading area after the application of the radiant energy to the articles,

providing for each of the compartments a closure member movable between open and closed positions and having properties of shielding the compartment against radiation when the closure member is closed,

providing for a movement of each closure member to the open position in accordance with a transfer of one of the articles into the compartments in which the closure member is located, and

providing for a movement of each closure member to the closed position after an application of the radiant energy to the article in the compartment in which the closure member is located and after the transfer of the article from the compartment.

68. In a method as set forth in claim 67, the steps of:

determining the disposition of the article in each of the compartments containing one of the articles, and

providing the transfer of the articles from the compartments to the unloading area in accordance with the determination of the positions of the articles in the compartments.

69. In a method as set forth in claim 67, the steps of:

providing for a transfer mechanism to grasp one of the articles in the loading area, then to move the grasped article from the loading area to the carousel, to move the grasped article into one of the compartments in the carousel, then to release the grasped article, then to move out of the carousel and then to move to the loading area.

70. In a method as set forth in claim 67, the steps of:

providing for a transfer mechanism to move from the unloading area to a position adjacent one of the compartments holding one of the articles, then to move into the compartment and grasp the article in the compartment, then to move out of the compartment, then to move to the unloading area and then to release the article in the unloading area.

71. In a method as set forth in claim 68,

providing for a first transfer mechanism to grasp one of the articles in a loading area, then to move the grasped article from the loading area to the carousel, then to move the grasped article into one of the compartments in the carousel, then to release the grasped article, then to move out of the carousel and then to move to the loading area.

providing for a transfer member to move from an unloading area to a position adjacent one of the compartments holding one of the articles, then to move into the compartment and grasp the article in the compartment, then to move out of the compartment, then to move to the unloading area and then to release the article in the unloading area.

72. In a method of applying radiant energy to articles, the steps of:

rotating a carousel in a loop at a substantially constant speed in a first direction,

applying the radiant energy in a beam to the articles in a second direction substantially perpendicular to the first direction during the rotation of the carousel at the substantially constant speed,

scanning the beam in a third direction substantially perpendicular to the first and second directions during the rotation of the carousel at the substantially constant speed,

interrupting the radiant energy and the movement of the carousel upon the occurrence of a fault,

moving the carousel in a fourth direction opposite to the first direction through a distance sufficient to bring the movement of the carousel in the first direction to the substantially constant speed at the position of the fault,

moving the carousel in the first direction to provide the carousel with the substantially constant speed at the position of the fault, and

renewing the beam of radiant energy, and the scan of the beam, at the position in the scan where the fault occurred.

73. In a method as set forth in claim 72 wherein

the carousel is cylindrical and rotates at the substantially constant speed in a closed loop having an axis extending in the second direction and wherein

the carousel has a ring-shaped configuration and wherein

radiation shielding material is disposed within the ring and outside of the ring.

74. In a method as set forth in claim 72,

dividing the carousel into compartments,

disposing individual ones of the articles in the different compartments, and

determining the positions of the articles in the compartments during the rotation of the carousel at the substantially constant speed.

75. In a method as set forth in claim 72, the steps of:

moving a transfer mechanism to the articles in the compartments at the position determined for the articles in the compartments during the movement of the carousel at the substantially constant speed, and

operating the transfer mechanism to transfer the articles from the carousel after the application of the radiant energy to the articles during the movement of the carousel at the substantially constant speed.

76. In a method as set forth in claim 73, the steps of:

dividing the carousel into compartments,

disposing individual ones of the articles in the different compartments, and

determining the positions of the articles in the compartments during the rotation of the carousel at the substantially constant speed,

moving a transfer mechanism to the articles in the compartments at the position determined for the articles in the compartments during the movement of the carousel at the substantially constant speed, and

operating the transfer mechanism to transfer the articles from the carousel, after the application of the radiant energy to the articles, during the movement of the carousel at the substantially constant speed.

77. In a method of applying radiant energy to articles, the steps of:

providing the articles in a carousel and rotating the carrousel continuously in a looped configuration,

applying radiant energy to the articles in the carousel during the movement of the carousel continuously in the looped configuration,

providing an unloading area displaced from the carousel, and

moving a transfer mechanism in a first direction from the unloading area to the carousel and then moving the transfer mechanism in a second direction transverse to the first direction to grasp one of the articles in the carousel after the application of the radiant energy to the article and then moving the transfer mechanism in a third direction opposite to the second direction and then moving the transfer mechanism in a fourth direction opposite to the first direction to transfer the grasped article to the unloading area.

78. In a method as set forth in claim 77, the steps of:

dividing the carousel into compartments,

determining the positions of the articles in the compartments, and

moving the transfer mechanism, in accordance with the determination of the positions of the articles in the compartments, to transfer the articles from the compartments to the unloading area after the application of the radiant energy to the articles and during the movement of the carousel in the closed loop.

79. In a method as set forth in claim 77 wherein:

the carousel has a cylindrical ring-shaped configuration defined by an inner diameter and an outer diameter and wherein

an energy source is provided at one of the inner and outer diameters of the carousel, and sensors are provided at the other one of the inner and outer diameters of the carousel, to determine the positions of the articles in the carousel.

80. In a method as set forth in claim 78 wherein

the carousel has a cylindrical ring-shaped configuration defined by an inner diameter and an outer diameter and wherein

an energy source is provided at one of the inner and outer diameters of the carousel, and sensors are provided at the other one of the inner and outer diameters, of the carousel to determine the positions of the articles in the compartments in the carousel.

81. In a method of applying radiant energy to articles, the steps of:

providing the articles in a carousel and rotating the carousel continuously in a looped configuration,

applying radiant energy to the articles in the carousel during the movement of the carousel continuously in the looped configuration,

providing a loading area displaced from the carousel, and

operating a transfer mechanism to grasp one of the articles in the loading area, then move the article in a first direction to the carousel, then move the article into the carousel in a second direction transverse to the first direction, then release the article in the carousel, then move from the carousel in a third direction opposite to the second direction and then move to the loading area in a fourth direction opposite to the first direction.

82. In a method as set forth in claim 81, the steps of:

providing vacuum cups to grasp the article,

applying a vacuum to the vacuum cups to grasp the articles when the articles are in the loading area, and

discontinuing the vacuum in the vacuum cups to release the articles when the articles have been moved into the carousel.

83. In a method as set forth in claim 81 wherein

the carousel has a cylindrical ring-shaped configuration defined by inner and outer diameters and wherein

a first member made from a radiation shielding material is disposed in the space defined by the inner diameter of the carousel and wherein

a second member made from a radiation shielding material is disposed in the space outside of the second diameter of the carousel.

84. In a method as set forth in claim 81 wherein

a stepping motor rotates the carousel continuously at a substantially constant speed.

85. In a method as set forth in claim 82 wherein

the carousel has a cylindrical ring-shaped configuration defined by inner and outer diameters and wherein

a first member made from a radiation shielding material is disposed in the space defined by the inner diameter of the carousel and wherein

a second member made from a radiation shielding material is disposed in the space outside of the second diameter of the carousel, and

a stepping motor rotates the carousel continuously at a substantially constant speed.

86. In combination for applying radiant energy to articles,

an accelerator for applying the radiant energy in a first direction,

a carousel movable past the radiant energy from the accelerator in a second direction having a particular relationship to the first direction, the carousel being divided into compartments,

closures disposed on the carousel and made from radiation shielding material, each closure being movable to a first position in the carousel to open an individual one of the compartments and to a second position in the compartment to close the individual one of the compartments, the closures being normally disposed in the second position, and

a control system for providing each closure in the open position to obtain a disposition of an article in an individual one of the compartments and for providing the closure in the closed position after the irradiation of the article and the removal of the article from the individual one of the compartments.

87. In a combination as set forth in claim 86,

a control system for determining the position of the articles in the compartments and for transferring the articles from the compartments after the application of the radiant energy to the articles in the compartments and during the opening of the closures in the compartments and in accordance with the determination of the positions of the articles in the compartments.

88. In a combination as set forth in claim 86,

the control system being operative to determine the disposition of the articles in the compartments and to open the closures in the compartments before the application of the radiant energy to the articles in the compartments, and

vanes made from a radiation shielding material and disposed in the carousel to define the compartments.

89. In a combination as set forth in claim 87,

the closure constituting a bellows wherein the bellows is compressed in the open position and is expanded in the closed position.

90. In combination for applying radiant energy to articles,

an accelerator for applying the radiant energy to the articles,

a carousel movable past the radiant energy from the accelerator in a second direction having a particular relationship to the first direction, the carousel being divided into compartments,

a first conveyor displaced from the carousel,

a second conveyor displaced from the carousel and the first conveyor, and

a control system for moving each article in first and second related directions from the first conveyor to a position above the carousel and then to a position in an individual one of the compartments in the carousel before the irradiation of the article and for moving the articles in the first and second related directions, after the irradiation of the article, to a position above the carousel and then to a position on the second conveyor.

91. In a combination as set forth in claim 90,

the control system including a first transfer mechanism for transferring the articles on the first conveyor into the carousel and including a second transfer mechanism for transferring the articles in the carousel to the second conveyor.

92. In a transfer mechanism as set forth in claim 90,

the carousel being divided into compartments,

apparatus for determining the positions of the articles in the compartments, and

the control system being operative to determine the positions of the articles in the compartments and to transfer the articles from the carousel to the second conveyor in accordance with this determination.

93. In a combination as set forth in claim 91,

the carousel being rotatable at a substantially constant speed,

the control system being operative to move the articles from the carousel to the second conveyor during the movement of the carousel at the substantially constant speed.

94. In a combination as set forth in claim 92,

the control system including a first transfer mechanism for transferring the articles in the first conveyor into the carousel and a second transfer mechanism for transferring the articles in the carousel to the second conveyor,

the carousel being rotatable at a substantially constant speed, and

the control system being operative to move the articles from the carousel to the second conveyor during the movement of the carousel at the substantially constant speed.

95. In combination for applying radiant energy to articles,

an accelerator for providing radiant energy,

a carousel movable past the radiant energy from the accelerator, the carousel being divided into compartments,

a first conveyor displaced from the carousel,

a second conveyor displaced from the carousel and the first conveyor, and

a control system for moving each article in first and second related directions from the first conveyor to a position above the carousel and then to a position in an individual one of the compartments in the carousel, to deposit the articles in the individual ones of the compartments before the application of the radiant energy to the articles in the compartments and for moving the articles in the first and second related directions, after the application of the radiant energy to the articles, to a position above the carousel and then to a position on the second conveyor to deposit the articles on the second conveyor.

96. In a combination for applying radiant energy to articles,

a carousel movable in a loop in a particular plane in a forward direction and constructed to hold the articles,

an accelerator for applying radiant energy to the articles in a direction transverse to the particular plane, the accelerator including a scanner for scanning the articles in the particular plane in a direction transverse to the movement of the articles in the loop and transverse to the direction of the radiation, and

a control system responsive to the occurrence of a fault for interrupting the radiation and the movement of the carousel in the loop and responsive to the resolution of the fault for initially reversing the movement of the article in the loop and for then resuming the movement of the carousel in the loop in the forward direction and resuming the irradiation of the article at the position in the interruption of the movement of the article on the carousel, the interruption of the radiant energy occurring at a particular position in the scanning by the scanner and the application of the radiant energy to the articles being resumed at the particular position in the interruption of the scanning by the scanner.

97. In a combination as set forth in claim 96 wherein

the carousel is moved at a particular speed in the forward direction before the occurrence of the fault and the carousel is moved at the particular speed in the forward direction at the instant that the application of the radiant energy to the article is resumed after the clearance of the fault.