Abstract: An improved squeegee holder for screen printing. A squeegee with a diamond or square shaped portion is clamped between two clamping plates inside V-shaped grooves in the clamping plates. Corner relief portions are provided within the clamping plates so that the corners not in use are not damaged. The clamping plates are aligned by two alignment pins and screwed together by a threaded rod with a handle. A spring surrounds each of the alignment pins urging the two clamping plates apart so that they separate when the screw handle is loosened.

Abstract: An apparatus for printing a viscous material onto a surface of a board through the medium of a screen having openings therein. The apparatus comprises a viscous material dispenser (S) of the type having a box-like housing (A) in which a chamber (5) for containing the material and a slit-like bottom aperture (3) communicating therewith are provided. A pair of blades (2A, 2B) depend from the housing (A) on opposite sides of the bottom aperture (3). A rear wall (8) of the housing (A) comprises a fixed upper wall section (8A) and a lower flap wall section (8B) swingably and slidably connected thereto and depending therefrom. The lower flap wall section (8B) defines the rear side of the bottom aperture (3). One of said blades which serves as a squeegee blade is fixed to the flap wall section.

Abstract: An improved squeegee for screen printing a thick film ink onto a substrate of a microelectronics circuit in order to form a thick film on the substrate. The squeegee is specifically configured to eliminate the creation of voids in a thick film deposited using the squeegee by enhancing the flow characteristics of the thick film ink as it is forced through a printing screen by the squeegee. Improved flow characteristics are achieved be appropriately configuring the cross-sectional profile of the squeegee in order to localize the printing forces on the ink at the working edge of the squeegee, in order to prevent ink ahead of the working edge from prematurely filling the openings in the screen.

Abstract: A printing drum is rotatable supported by a fixed hollow cylindrical member at two axially spaced positions thereof so that the printing drum may be supported in a highly stable fashion and any mis-alignment of the printing drum can be avoided. Also, the interior of the fixed hollow cylindrical member provides an easily accessible space for accommodating a printing ink container and a pump for supplying printing ink. In particular, by using a squeegee blade instead of a squeegee roller, a particularly advantage can be obtained because the diameter of the fixed hollow cylindrical member can be such that an annular chamber defined between the fixed hollow cylindrical member and the inner circumferential surface of the printing drum is barely sufficient to accommodate the squeegee blade in the annular chamber, and the fixed hollow cylindrical member can provide a highly rigid support structure.

Abstract: A squeegee apparatus for a screen printing machine wherein the vertical operation rod being connected to the moving shaft of the air cylinder fixed to the horizontal movement plate of the squeegee drive section, the cushion member being provided between the vertical operation rod and the vertical movement support rod of the squeegee holder, and the guide posts having stoppers at their top ends being provided on the vertical movement support rod which are slidably inserted through the guide sleeves of the vertical operation rod.

Abstract: A screen printing apparatus has simultaneously movable multiple print heads made movable by a single fluid cylinder. The apparatus also has multiple printing platens, and structure for indexing and simultaneously registering the multiple platens into printing position, as well as combined flood bar/squeegee ink applicators which are capable of simultaneously shifting of operational positions, and provide a high quality printed image on the goods printed thereby.

Abstract: The stencil printing device of the present invention comprises a mixing unit for receiving the first liquid from the first liquid storage container and the second liquid from the second liquid storage container, and producing printing ink by mixing the two liquids, a printing ink supply passage for conducting the printing ink produced by the mixing unit to an ink squeegee unit of a printing drum, ink amount sensor for detecting the amount of the printing ink in the ink squeegee unit, and ink supply control unit for controlling the amount of the printing ink that is supplied from the mixing unit to the ink squeegee unit according to the amount of printing ink detected by the ink amount sensor. Thus, a relatively large number of prints can be made with each bottle of printing ink so that the frequency of replacing the ink bottle may be reduced.

Abstract: A squeegee assembly including an outer pair of longitudinal plate brackets secured about a squeegee holder for retaining and positioning a squeegee blade. The squeegee holder secures the squeegee blade and is connected to positioning shafts at each end of the outer brackets. The positioning shafts may be rotated to adjust the position of the squeegee holder and blade, which retains the printing edge of the blade at the desired distance from a slotted opening in the outer brackets. The squeegee holder may consist of one or two longitudinal bars and includes a longitudinal flange which is positioned in a longitudinal groove in the squeegee blade to ensure the proper retention of the squeegee blade. The outer brackets are secured at the top end and include a longitudinal groove for connecting the squeegee assembly to the carriage of the screen printing apparatus.

Abstract: Silk-screen printing apparatus is provided for the silk-screen printing of articles such as oval-shaped bottles and containers on the two major curved peripheral surfaces thereof, sequentially, with one printing pass. The apparatus utilizes, in this case, two squeegees positioned one behind the other and synchronized in such a manner as to force ink through a screen provided with two image patterns as each of the two image patterns on the screen moves sequentially over the two curved surfaces to be printed.

Abstract: A sensor system utilized with a screen printing press for selectively adjusting a length and relative position of the front and rear ends of a printing stroke to traverse a variably sized and positioned image area being applied to a substrate. The sensor system includes fixed reference sensors mounted on the printing press for detecting the position of the front and rear ends of the printing stroke and indicating a distance along which the carriage travels. The sensor system permits the stroke length and the relative position of the printing stroke proximate the image area to be readily adjusted by varying the position of the carriage and monitoring the stroke length of the printing stroke between the front and rear positions.

Abstract: A screen printing apparatus includes a screen frame disposed above a ceramic green-sheet, and a screen on which an electrode pattern is formed is held by the screen frame. A cover is detachably attached to the screen frame by making a recess formed on upper surface of the screen frame engage with a projection formed on a lower end surface of the cover. An interior of the cover becomes an airtight state substantially except for a stitch portion of the screen. Therefore, when a vapor pressure of a volatile solvent of an electrode paste becomes to be saturated in the interior of the cover after volatilization of the volatile solvent to some extent, the volatile solvent of the electrode paste is prevented from further volatilizing.

Abstract: A printing machine comprises a turntable carrying a plurality of object supports in a circular arrangement, at least one of which object supports is adjustable in position on said turntable perpendicularly thereto. The printing machine may be a silkscreen printing machine, for example.

Abstract: This invention relates to a flood bar and squeegee for printing apparatus. In accordance with one aspect of the present invention, the flood bar or squeegee comprises an elongated member having an ink engaging face. A plurality of spaced apart fins are arranged across the face. The fins are generally parallel to one another and each end of the member is bent inwardly so as to inhibit the flow of ink to the sides of the screen.

Abstract: A squeegee head includes a squeegee carried by a squeegee-holder carried by a support and whose inclination on the support is adjustable by rotation about a pivot axis parallel to the lengthwise direction of the squeegee. The squeegee-holder pivot axis is substantially coplanar with the free edge of the squeegee. The squeegee heads finds a specific application in silkscreen printing machines.

Abstract: An inking device effective to provide a faultless ink-tight fit comprises a sheet-like support for a plate, and a cartridge, similar in shape to an overturned glass, which is adapted to contain an ink and has a lip in liquid-tight doctoring engagement with the plate, wherein the cartridge has a ring formed from a zirconia-containing ceramic material and provided with a sharp edge constituting the lip.

Abstract: A printing machine comprises a print line along which at least one object support can move and a printhead overlying said print line at at least one printing station and twinned with another printhead disposed on standby away from said print line and with which it is interchangeable.

Abstract: Doctor blade and doctor blade device for the application of flowable substances on flat surfaces with a doctor blade profiled rod and a doctor blade element, a magnetic device is assigned to the doctor blade, the arrangement, shape, strength of the magnetic field produced by this device determines the local position of the doctor blade, and additionally through this magnetically determined position and fixation and through device parts, the angular position of the doctor blade is also adjusted, whereby the doctor blade has limited freedom of movement.

Abstract: The invention relates to a doctor blade carrier intended particularly for a silk-screen printing machine, wherein it has a first pair of fastening reliefs (13a, 13b) arranged facing each other; a second pair of fastening reliefs (14a, 14b) arranged facing each other; the reliefs of the first and second pairs (13a, 13b, 14a, 14b) being respectively complementary to one another so as to be able to interact with each other in a removable fashion; one of the two pairs of reliefs (13a, 13b, 14a, 14b) having a double plurality of similar successive reliefs, the same clamping means (10, 15) allowing the angular locking of the vise (5) with respect to the base (6) about the main axis (12) between two limiting positions.

Abstract: Silk-screen printing apparatus is provided for the silk-screen printing of articles such as oval-shaped bottles and containers on the two major curved peripheral surfaces thereof, sequentially, with one printing pass. The apparatus utilizes, in this case, two squeegees positioned one behind the other and synchronized in such a manner as to force ink through a screen provided with two image patterns as each of the two image patterns on the screen moves sequentially over the two curved surfaces to be printed.

Abstract: An offset printing method wherein, by using a screen stencil, ink is once printed on a transfer sheet whose top most layer is made of silicone rubber, and thereafter, the ink is transferred from said transfer sheet onto a substrate to be printed on, or by the use of an ink containing at least an organic solvent and a thermoplastic resin, the ink is transferred from said transfer sheet onto a substrate for printing through heating said substrate for printing or said transfer sheet, and an offset printing machine to be employed in said offset printing method which comprises, at least, a screen stencil movable in the horizontal direction, a rotatable cylindrical roller with a transfer sheet whose top most layer is made of silicone rubber being wound thereon, and a squeeze movable up and down.

Abstract: The stencil emulsion coating apparatus of the present invention includes a screen frame holder and cooperating troughs which coat opposite sides of the screen by running upwardly there against. All motion is provided mechanically without use of hydraulics or pneumatics, with the required motions being electronically controlled in known manner. Each end of each trough is provided with a warpage sensor which senses pressure between the screen and leading trough edge and adjusts trough position in areas of warpage to accommodate same.

Abstract: A machine screen-prints the surface of flat objects or objects with a convex, curvilinear transverse section, such as bottles or cans. It is formed to be adapted rapidly for the printing of containers with any radius of curvature, however small, without having to go through the laborious replacement of mechanical parts and without causing harmful mechanical vibrations, even during heavy duty use. The machine includes a printing station in which the container (2) oscillates around a longitudinal axis passing through the center of the mouth of the container, with the top surface of the container, tangent to a screen (3) which moves in a longitudinal direction. The upper surface of the screen is scraped by a squeegee fitted above it which presses the ink through the mesh of the screen and is synchronized to operate alternately with it (in opposite directions). The bottom edge of the squeegee follows an arcuate oscillating trajectory.

Abstract: Disclosed is a screen printing apparatus for filling minute through-holes in a board with conductive paste or the like by screen printing. When screen printing is performed with this screen printing apparatus, the board is placed on a stage through the intermediation of a film which is supplied to the stage by means of adhesive pads. The adhesive pads are brought into contact with the uppermost one of a plurality of stacked films to catch it by adhesion and then transfer the film to a position above the stage. Films are caught one after another by adhesion.

Abstract: A screen printing apparatus for printing solder paste onto a surface of a printed circuit board through the medium of a screen having openings. The apparatus includes a solder paste automatic supply dispenser of a nonflexible box-like structure which is arranged to be displased along a pair of guide rails back and forth and to be raised and lowered relative to the guide rails. The dispenser has a chamber for containing solder paste to be printed on the surface of the circuit board and an adjusting device attached to the dispenser for adjusting the temperature of the solder paste contained in the chamber so as to be capable of maintaining the temperature at a predetermined degree.

Abstract: A squeegee drive structure for a solder paste printing machine. The circuit board and screen are aligned in the machine. The squeegee drive structure is mounted on the machine independently of the screen to which the paste is applied. The drive structure which supports the squeegee is adapted for linear movement away from the solder paste application area and upward pivotal movement in order to provide easy access to the squeegee.

Abstract: A portable automatic silk screen printer including a frame (24) supporting a transport device (26) which selectively moves a printing head (28) which is programmed to control the flood and squeegee bars (56, 58).

Abstract: In the application of a decorative coating onto a glass pane by the silk screen printing process, a printing screen (2) is used, the printing surface of which extends beyond the peripheral face (9) of the glass pane (1). The printing ink situated in the meshes of the printing screen outside the glass surface in the printing operation is blown away or is sucked away by a suction nozzle (23), which is guided over the printing screen (2) behind the scraper (21).

Abstract: A silk screen printer includes a printing table, a stencil held in a frame, and a squeegee which is movable relative to the frame to enable a first pattern on the stencil to be transferred to print material registered on the printing table in order to form a second pattern. During an actual printing sequence, the squeegee is intended to move over the stencil and relative to the frame in a first direction, whereas the stencil and the stencil-frame are intended to move in another direction opposite to the first direction. The printing table is a flat printing-table, which can be displaced synchronously with the frame. During a printing sequence, a gripper operative to collect print material located in a laying-on station is registered to the printing table for movement in common therewith.

Abstract: A vertical screening apparatus in which the board to be screened is reciprocally shuttled into and out of the print zone before and after vertical reciprocation of the flood blades and print squeegees. A mechanism is provided to horizontally locate each board and to jog each board between successive sequences of flood and print strokes. Means are provided for tilting the print squeegee between successive print strokes.

Abstract: A multi-station screen printer is provided with components which simplify maintenance, reduce repair and increase ease of use. The printer includes at least one printing head which defines a printing station, a screen holding device positioned thereunder for holding a screen, and at least one arm for carrying substrates positionable below the screen holding device. A flood bar and squeegee carriage is slideably mounted to the printing head and is shiftable by a telescoping cable which shifts the carriage between a print position wherein the squeegee is lowered to the screen and a non-print position wherein a flood bar is lowered near the screen. The arm for carrying platens is provided with a ball and socket system of registration which reliably positions the arm at each station and releases the arm therefrom after printing on the substrate.

Abstract: A dual-purpose apparatus for selectively applying an emulsion onto a mesh screen of a screen printing plate and attaching an emulsion layer-containing film to the screen, comprises a printing plate support for supporting the screen printing plate, a film feed device for feeding the emulsion layer-containing film, a film guiding-and-cutting mechanism for guiding the emulsion layer-containing film along the mesh screen of the screen printing plate, and a pressing-and-applying mechanism for pressing the emulsion layer-containing film and for applying the emulsion onto the mesh screen. The pressing-and-applying mechanism includes a support for replaceably supporting a pressure roller unit or an emulsion bucket.

Abstract: A screen printer which has a cleaning device for cleaning a mask which is formed with at least a hole of a printing pattern. The cleaning device includes a spatula member and an airstream generating device. The spatula member is moved along the surface of the mask in contact therewith so as to scrape ink adhered to the mask surface. The airstream generating device generates an airstream passing through the hole of the mask so as to remove ink within the hole of the mask.

Abstract: Screen printing machines of the carousel type and apparatus for use in those machines. One of the features relates to a print head assembly having a carriage mounted for reciprocating movement, the carriage comprising two spaced apart bearing sections arranged relative to three support members. Another feature relates to an improved air manifold for the print head assembly. Yet another feature is concerned with an improved screen holding device utilizing inflatable bags. Yet another feature relates to an improved vacuum supply mechanism. A further feature is concerned with an improved frame structure.

Abstract: A screen printer effects a printing by moving a squeegee in contact with a screen to force a printing paste through a printing pattern formed on the screen. The squeegee is held by a squeegee head. The squeegee head includes a support member for supporting the squeegee in such a manner as to move the squeegee upward and downward, and at least one moving member which swingably supports the support member and is movable together with the support member. When the squeegee is to be exchanged, only the support member is angularly movable relative to the moving member so as to provide a sufficient space above the screen to facilitate the exchange of the squeegee.

Abstract: A machine for screen printing curved objects has a frame with support rods and positioning rods, a scraping assembly which slides on the support rods under the influence of a motor and a gear wheel/spur rail combination, and a pair of screen-holding structures which are anchored to the positioning rods and hold a screen therebetween. The scraping assembly and the screen-holding assembly can be vertically positioned under the influence of pneumatic cylinders. A workpiece mold holds a curved workpiece such as a bowl and is rotatable under the influence of an axle and another gear wheel/spur rail combination. Three scrapers are attached to the scraping assembly. When the motor is activated, the scraping assembly moves and the workpiece mold rotates. Outside scrapers spread ink on the screen and a center scraper applies the ink to the workpiece. A proximity switch stops the motor when the scraping assembly has moved a predetermined distance.

Abstract: A detachable scraper attachment for a flood bar having a pair of opposing opposite edges comprising a portion adapted to mount on a portion of the flood bar holder, a flange having an upper and lower edge, the lower edge being generally arcuate, the upper edge attached to the channel portion, and means for detachably affixing the scraper attachment to the edges of the flood bar.

Abstract: A printing machine comprises a frame and a turntable adapted to rotate on the frame to move objects to be printed along a displacement circumference. At least one silkscreen type printing head is aligned with the turntable and includes a support beam and, carried by the support beam, a screen support adapted to receive a screen and a squeegee carriage adapted to move relative to the screen support. The support beam extends along a line which is secant to the displacement circumference and is coupled to the frame at at least two points thereon disposed on respective sides of the displacement circumference. The squeegee carriage moves parallel to the support beam.

Abstract: An automatic screen printing press has a frame with a plurality of platens which are movable seriatim through a plurality of stations in an endless path of movement past printing heads having a power-driven squeegee carriage thereon. At least one of the printing heads is mounted for movement and is positioned at a first location adjacent an open printing station at which cooling or drying of the ink is done when printing in a first sequence. When desiring to print in a different or second sequence, the movable printing head is shifted to previously open printing station to print at this latter station during this second sequence thereby leaving its previously-occupied station open for cooling or drying of ink during this second sequence. The movable head allows the user to print a larger number of sequences using fewer printing heads than a user can print using a conventional, automated screen printer which has the same number of printing heads, but all of which heads are fixedly mounted.

Abstract: A printing apparatus including: a screen having a printing plate portion and reinforcing strips formed on both sides of the printing plate portion; a stretching device for stretching the screen by applying a predetermined tension thereto in a longitudinal direction of the strips; a squeegee for sliding on the screen in the same direction as the longitudinal direction of the strips, thereby transferring ink onto a surface subjected to printing; and a support table for supporting a material subjected to printing. The squeegee has a width larger than the minimum spacing of the strips on both sides of the printing plate portion. When the squeegee slides on the screen, it presses the printing plate portion and the strips on both sides simultaneously. In printing, the portion of the screen in contact with the surface subjected to printing is maintained flat in the transverse direction. A stretching amount of the screen in the moving direction of the squeegee is equal to a stretching amount of each strip.

Abstract: In a coating machine in which a doctor blade is magnetically applied, at least one strap or profiled section is tensioned longitudinally or transversely with a supporting surface for the conveyor belt or a substrate web. Between this strap or section and the magnet table on the one hand, and the conveyor belt and the substrate web, on the other hand, a relative movement is produced.

Abstract: The carriage of a printing machine, in particular a silkscreen printing machine, carrying the printing device is mobile on a guide carried by arms forming with uprights a set of deformable parallelograms. Lifting means include a cam whose edge cooperates with a cam follower roller carried by a longitudinal member controlling this set of deformable parallelograms. The longitudinal member is pivotally supported by two same level arms of the set of deformable parallelograms. It interacts with an angular orientation maintaining device which maintain the axis of the cam follower roller parallel to the axis of the cam.

Abstract: A method and apparatus for pre-registering a set of multi-color print screens prior to installation into a registration apparatus of a screen printing machine.

Abstract: A doctor blade for use in an adhesive screen printing apparatus is formed of a main blade member of spring steel along with a U-shaped cap. The cap is ideally formed of a filled nylon material and is attached to the blade member with a silicon RTV compound. The use of this construction results in much more even laydown of adhesive from pattern to pattern and from the left and right hand sides of the screen. Use of the invention also serves to increase screen life.

Abstract: An assembly for holding a squeegee blade provides a levelness control of the squeegee blade and a pressure control on the squeegee blade. The assembly includes a wedge having a length approximately equal to that of the squeegee blade. The wedge also has a right triangle shape along its longitudinal axis. The wedge is positioned between an upper stationary body and the squeegee blade. There is also a pressure adjustment for moving the wedge in either direction along its longitudinal axis, such that the motion of the wedge produces pressure on the squeegee blade; thus, providing the pressure control. The leveling control is accomplished by a micrometer attached to a rigid plate. The micrometer being rotatable along its longitudinal axis. A gear, which is attached to the upper stationary body, is rotatable about a pivot point on the ridged plate by the rotation of the micrometer.

Abstract: The invention discloses an automatic manual set for screen printing which delivers constant pressure of a squeegee and uniformity in printing. The automatic manual set basically includes an ensemble of four levers inter-clamped by sleeved axles. Provided is anatomic handle, an ink spreading knife, and printing squeegees.

Abstract: A doctor for screen printing comprises a doctor strip having a lip of elastic material intended to rest on the printing screen, as well as a soft or hard elastic backing arranged on one or both sides of the doctor strip, the doctor strip and the backing being clamped in a doctor holder extending across the width of the printing screen. To improve the ink distribution on the print pattern and the guiding of the scraper on the printing screen, and to provide a more satisfactory reproducible contact pressure behavior or flexural rigidity under a constant angle of incidence of the scraper, the doctor strip and the backing are laminated together over substantially their whole surface area to form a composite material with layers of two different degrees of elasticity. In one embodiment, relatively soft strips are applied to both sides of a hard elastic backing to form composite.

Abstract: A screen printer comprising a squeegee for applying a printing material to a work face when the squeegee moves on an upper side face of a screen while being kept in contact therewith, a doctor for uniforming a thickness of the printing material left on the upper side face of the screen, and a cleaner including a scraping bucket which moves on the underside face of the screen while being kept in contact therewith so as to scrape the printing material attached to the underside face of the screen upon applying operation of the squeegee. The scraping bucket comprises a bucket body formed into a concave shape with an open top in profile, and a scraping strip formed on an end of one side wall of the bucket body, which is inclined toward an advance direction of the scraping bucket.

Abstract: A flat bed screen printing machine wherein the material to be printed is movable in stepwise fashion with or relative to an assembly including a flat bed at one side and a screen at the opposite side of the path for the material. The material moves with the assembly during application of paste and moves slowly relative to the assembly while the latter moves rearwardly to its starting position. The slow movement of the material serves to move its passer marks to optimum positions with reference to a detector. One or more squeegees are adjacent the screen. The squeegee(s) are mounted on the assembly for movement relative to the screen.

Abstract: A compact, multi-function screen printing table is provided which, with the exception of the emulsion rinsing step, permits all of the steps of a screen printing process to be carried out at a single, space-saving work station. The upper side of the table is provided with a translucent foam-backed glass cover plate which cooperates with a clear glass base plate to form a vacuum exposure chamber and, when in a lowered position, also forms a convenient work surface for screen assembly, layout and stripping purposes. The cover plate is also used in conjunction with an automated printing arm assembly to carry out the actual imprintation process. The cover plate is movably mounted on the base plate and may be selectively and adjustably moved to effect precise registration and alignment between a printing screen and a substrate. Suitable backlighting and exposure lighting systems are disposed in a housing which depends from the table top.

Abstract: An improved printing machine includes a screen stencil supported over a surface of a material to be printed and having first and second ends, a squeegee which applies a force on the screen stencil as it travels thereacross, and the screen stencil having first and second ends, the first end being parallel to the squeegee sides and supported for movement forward and backward in accordance with forward and backward movement of the squeegee across the screen stencil so as to maintain the tension in the screen stencil constant on the side of the squeegee holding the ink.