DEVICE FOR FEEDING PAPER SHEETS OR THE LIKE
A device for feeding paper sheets or the like has a feed path whereby paper sheets are fed, a distribution unit for distributing the paper sheets that are fed thereto, and a stacking unit that holds the paper sheets that are distributed, wherein the stacking unit comprises: a rotary feed unit having a rotary shaft; gripping claws that extend in a spiral fashion with respect to this rotary shaft and grip and feed one edge of a paper sheet therebetween; an extraction unit that extracts the paper sheets fed by the rotary feed path from the gripping claws; a stage that conforms with the rotary feed unit and that holds between itself and the rotary feed unit one edge of a paper sheet that has been extracted from the gripping claws; and a stopping element that abuts one edge of a paper sheet that is held on the stage.
This application claims benefit of priority from Japanese application number JP 2008-281579 filed Oct. 31, 2008, the entire contents of which are incorporated by reference herein.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a device for feeding paper sheets or the like that feeds paper sheets (documents or forms) to a stacking unit.
2. Description of the Related Art
Conventional feeding devices are capable of feeding paper sheets of a large number of different types and distributing these sheets before stacking them in a stacking unit. Techniques have been disclosed for respectively gripping these fed paper sheets by a gripping claw unit comprising spiral tooth members and placing these in an inverted fashion in the stacking unit: an example is to be found in Laid-open Japanese Patent Application No. Tokkai 2005-263453 (hereinbelow referred to as Patent Reference 1).
However, the spiral tooth members must be at least of a size matching the maximum size of the paper sheets that are to be fed. Also, in cases where the paper size is large, or where the paper sheets are folded, the paper sheets may become bent, or may be placed with the edges of sheets of different size not lined up with each other. In such cases, the paper sheets must be lined up by hand.
SUMMARY OF THE INVENTIONThe present invention was made in order to solve the above problem, its object being to provide a device for feeding paper sheets or the like whereby stacking of paper sheets of different size can be reliably performed and the blade wheel that grips the sheets can be made of small size.
In order to achieve the above object, a device for feeding paper sheets or the like according to the present invention is constructed as follows. Specifically, in a device for feeding paper sheets or the like having
a feed path whereby paper sheets are fed,
a distribution unit for distributing said paper sheets that are fed thereto, and
a stacking unit that holds aforementioned distributed paper sheets,
aforementioned stacking unit comprises:
a rotary feed unit having a rotary shaft;
a plurality of gripping claws that extend in a spiral fashion with respect to the rotary shaft and grip and feed one edge of a paper sheet therebetween;
an extraction unit that extracts aforementioned paper sheets fed by aforementioned rotary feed unit from aforementioned gripping claws;
a stage that conforms with aforementioned rotary feed unit and that holds between itself and aforementioned rotary feed unit one edge of aforementioned paper sheet that has been extracted from aforementioned gripping claws; and
a stopping element that abuts one edge of a paper sheet that is held on aforementioned stage.
With the present invention, there is provided a device for feeding paper sheets or the like whereby stacking of paper sheets of different sizes can be performed in a reliable fashion.
An embodiment of the present invention is described by way of example below with reference to the drawings. In the drawings, the same structural elements are indicated by the same reference symbols and further detailed description thereof is omitted.
The distribution unit is constituted by the feed rollers 14, branch gates 15 and discharge rollers 17.
It may be noted that it is also possible to provide additional stacking units 23 by connecting a mutual horizontal feed path 11 with this device 10 for feeding paper sheets or the like.
The vertical feed path 13 is a guide for feeding forms A to a stacking unit constituting the discharge destination.
A plurality of feed rollers 14 are arranged on the vertical feed path 13. The feed rollers 14 feed forms A upwards by rotating in one direction (clockwise direction in
The branch gates 15 are provided at the branch positions of the horizontal feed path 11 and the vertical feed path 13 and at the branch position of the vertical feed path 13 and the stacking units 23. The feed direction of the branch gates 15 is changed over by means of relay circuits 42 to the vertical feed path 13 or stacking unit 23 so that the forms A that are supplied are distributed to the designated stacking unit 23. Distribution of the forms A can be achieved by changing over the branch gate 15 to the horizontal feed path 11 or a vertical feed path 13 by means of a relay circuit 42. The relay circuits 42 are started up by operation control performed by the control unit 25.
As the paper detection unit 16, for example optical sensors are respectively arranged on the feed paths 11, 13 and between the branch gates 15 and discharge rollers 17, so as to detect the forms A. The optical sensors detect passage of the forms A along the feed path when the light that is output from a light emitting unit to a photodetection unit is interrupted by a form A that has been fed thereto, and detect arrival of the leading end of a form A at the position of discharge to the stacking unit 23. The control unit 25 commences drive control of the blade wheel 18 provided in the designated stacking unit, a suction fan 24a, and a suction feed belt 24b, when the paper detection unit 16 detects a form. It may be noted that the control unit 25 may also calculate the feed length of a form (length in the feeding direction) L=v·t from the time t at which the light of the paper detection unit 16 is interrupted and the preset feed speed v of a form.
The discharge rollers 17 are arranged between the paper detection unit 16 and the blade wheel 18. These discharge rollers 17 rotate in one direction (clockwise direction in
The blade wheel 18 comprises a rotary shaft 18a and a plurality of gripping claws 18b that are arranged with a prescribed separation about this rotary shaft 18a.
The rotary shaft 18a rotates in the direction of winding up the forms A (i.e. the anticlockwise direction in
The extracting plates 19 extend in the peripheral direction from the rotary shaft 18a and are arranged in an interpolated fashion between the blade wheels 18 as shown in
In the initial condition, in which no forms A are gripped between the stage 20 and the leading ends of the blade wheels 18, as shown in
The blade wheels 18 and stages 20 are constituted as a pair and a plurality of these are arranged corresponding to the paper size of the forms that are fed by the device 10 for feeding paper sheets or the like. The stages 20 are respectively independent and are raised and lowered in accordance with the weight/thickness of the forms to be held (see
Stopping elements 21 (or stopper 21) are arranged substantially in the vertical direction below one end of the extracting plates 19, so that the leading ends of the forms A that are held on the stages 20 respectively make contact with these stopping elements. With the rotation of the blade wheel 18, a form A that is in contact with the extracting plates 19 moves downwards from above the extracting plate 19 so as to make contact with the stopping element 21. Thus the forms are stacked on the stage 20 in a condition with the leading ends of the forms making contact with the stopping element 21 and held in a condition with the leading ends of the forms A aligned.
The stacking units 23 are arranged below the stages 20 and hold the other end (rear ends) of forms A that are longer than the stages 20. A plurality of stacking units 23 are provided (eight levels in the vertical direction in the case shown in
The suction feed unit 24 comprises a suction fan 24a that applies suction to the forms and is arranged above the blade wheel 18, on the line of extension thereof in the discharge direction, and a suction feed belt 24b for feeding the forms to which suction was thus applied.
Suction is applied to the forms by the suction fan 24a, in the feed surface of the suction feed unit 24″ means that holes 24c are provided in a feed guide 24e (plate-shaped and non-moving), and suction is applied to the forms by the suction fan 24a through these holes 24c.
The suction feed belt 24b is an open belt that effects feeding by applying suction to the rear end of the forms A whose leading ends are gripped by the blade wheel 18. The suction feed belt 24b is provided with a plurality of holes 24d connected with the suction fan 24a in order to increase the suction produced by the suction fan 24a. The suction feed belt 24b is driven by the rotary operation of a motor 41, whose rotation is controlled by a driver 40. The operation of the driver 30 is controlled by the control unit 25.
Also, as shown in the Figure, a plurality of holes 24d are provided in the suction belt 24b and holes (not shown) are also provided in the feed guide 24e at prescribed intervals with respect to these holes 24d. Consequently, suction is of course also applied to the forms A at the holes 24c of the suction belt 24b.
The suction feed belt 24b rotates in the feed direction (clockwise direction in
Since the leading end of the forms is held by the blade wheel 18 and stage 20 and their rear ends are suction-fed by the suction feed unit 24, there is no need to match the size of the blade wheel 18 to the maximum size of the forms: in this way, the size of the blade wheel 18 can be reduced. Also, even when the paper size is large (long feed length), or even when the paper is folded, stretching of the paper means that it can still be reliably placed in the stacking unit 23.
The control unit 25 performs feed control of the forms A by controlling the operation of various types of drivers and relay circuits (not shown) in the device 10 for feeding paper sheets or the like, in accordance with the instructions from a control host 100.
The control host 100 is loaded with and starts up an OCR application software program. It also gives instructions to the control unit 25 so that, after reading processing of the forms has been carried out, designation of the stacking unit that is the destination of discharge of the forms, and printing of numbering data, are performed for each form, in accordance with the results of recognition processing of the images obtained by such reading. The control unit 25 performs control of the operation of the various drivers and relay circuits in accordance with these instructions. It should be noted that it would also be possible for the control unit 25 to be loaded with this OCR application software program and to perform the recognition processing of the images as described above.
Next, the operation of feeding forms using this device 10 for feeding paper sheets or the like will be described.
First of all, the case where the forms A that are fed are forms of small paper size i.e. the length of these forms (feed length) is shorter than the length of the blades of the blade wheel 18 will be described.
The control unit 25 performs drive control of the feed belt 12 on the horizontal feed path 11, and the feed rollers 14 and branch gate 15 on the vertical feed path 13, and performs feeding of the forms A in accordance with instructions to execute paper feed that are input from the control host 100. The forms A are fed to the designated discharge destination stacking unit 23.
When the paper detection units 16 that are arranged on the feed paths 11, 13 and in the vicinity of the designated stacking unit 23 detect an incoming form A that is being fed, the control unit 25 performs drive control of the blade wheel 18, suction fan 24a and suction feed belt 24b of the designated stacking unit 23.
At the start of rotation, control is performed at such that the speed of rotation of the blade wheel 18 is slower than the paper feed speed of the discharge rollers 17. As a result, the forms A are gripped by the gripping claws 18b when they are inserted in the gaps 18c of the blade wheel 18. In this condition in which such gripping is effected, the blade wheel 18 is rotated, thereby feeding the forms A to the position of arrangement of the stage 20 (see paper feeding, in the upper part of
Next, the control unit 25 ascertains whether or not the suction fan 24a and the suction feed belt 24b are being driven. To achieve this, the control unit 25 for example calculates L=v·t, where t is the time for which a form A blocks the passage of light to the paper detection unit 16, v is the paper feed speed of the forms, which is set beforehand, and L is the feed length of a form (length in the direction of feeding). Then, if the feed length of the form that is being fed is less than a preset feed length, for example if the feed length of this form is less than the length of the blades of the blade wheel 18, a stationary condition is maintained without driving the suction fan 24a or the suction belt 24b. In this case, since the feed length of the form is shorter than the length of the blades of the blade wheel 18, the suction fan 24a and suction feed belt 24b maintain a stationary condition.
Next, when the leading end of this gripped form A comes into contact with the extracting plate 19, this extracting plate 19 arrests the feeding of the form A accompanying the rotation of the blade wheel 18. It should be noted that, even after feeding of the form A has been arrested, the blade wheel 18 continues to rotate in the feed direction (anticlockwise direction in
The leading end of the extracted form A is placed on the stage 20. The leading end of this form A is restrained by the stage 20 and the periphery of the blade wheel 18 (leading end portion of the gripping claws 18) in a condition in which rotation of the blade wheel 18 can still be performed, and the form A is thus held on this stage 20. Then, when the next form is fed, a feeding operation identical to that described above is performed, and the forms are thus held, overlaid in a sequential fashion, on the stage 20. When a plurality of forms are thus held, the stage 20 is lowered in response to their weight, and a plurality of forms can thus be held with their leading ends aligned, between the stage 20 and the gripping claws 18b.
Next, the case where the forms A that are fed are forms of larger paper size i.e. the length of these forms (feed length) is longer than the length of the blades of the blade wheel 18 will be described.
The control unit 25 drives the suction fan 24a and the suction feed belt 24b of the discharge destination stacking unit 23. In this way, the suction fan 24a and the suction feed belt 24b effect suction and feeding of the rear end of the form. The form length is calculated based on the detection result of the paper detection unit 16 and the paper feed speed. Based on this calculated form length, the suction fan 24a and the suction feed belt 24b are driven with the timing with which the rear end of the form reaches the suction feed belt 24b.
As shown in
The form A comes into contact with the stopping element 21 and its leading end is held between the stage 20 and the periphery of the blade wheel 18. As a result, the forms A are held on the stage 20 with their leading ends aligned by the stopping element 21 and their rear ends held by the stacking unit 23.
In this way, it is possible to feed forms of longer feed length than the size of the blade wheel. In other words, the blade wheel 18 in the feed device for paper sheets or the like according to this embodiment can be made smaller than the size of the conventional blade wheel, which matched the forms in size. Even though the blade wheel is made small, forms of a size which was conventionally difficult to feed can be reliably fed to the stacking unit 23.
Also, even when the feed length of the forms is long, the forms can be reliably placed in the stacking unit 23 thanks to being stretched by the suction feed unit 24.
In this way, in the device for feeding paper sheets or the like according to this embodiment, the leading ends of the forms that are fed by the blade wheel are held between the stage and the periphery of the blade wheel, and alignment of the leading ends of the forms is performed by the stopping element. In this way, alignment of the leading ends of the forms can be reliably performed.
Also, since, in the device for feeding paper sheets or the like according to this embodiment, the leading ends thereof are held between the stage and the periphery of the blade wheel, the forms can be prevented from getting out of sequence.
Also, conventionally, the limit in respect of feed length of the forms that was achievable was about ¾ of the blade wheel periphery. In contrast, in the case of the device for feeding paper sheets or the like according to the present embodiment, the leading ends of the forms are held on the stage and the rear ends of the forms are sucked onto the suction feed unit (suction fan, suction feed belt), so that these rear ends are fed in the opposite direction to the stopping element with respect to the stage. As a result, feeding of forms having a feed length equal to or exceeding the periphery can be achieved, for a blade wheel of the same size as conventionally.
Also, as described above, by forcibly feeding the rear ends of the forms in the opposite direction to the stopping element with respect to the stage, by using a suction feed unit (suction fan and suction feed belt), feeding of the forms can be achieved irrespective of the feed length of the forms, and the occurrence of paper jamming can thereby be prevented.
Also, in the device for feeding paper sheets or the like according to this embodiment, the blade wheel can be made smaller than the size of a conventional blade wheel, which matched the size of the forms. Forms of a size that was conventionally difficult to feed can thus be reliably discharged into a stacking unit even with a small blade wheel.
Also, since it is possible to make the blade wheel smaller, the number of forms that can be stacked on a single level of the stacking unit can be increased. Also, by making the height of a single stacking unit stage lower, the device can be reduced in size. Also, if the device is made of the same size as conventionally, more stacking units can be installed therein.
It should be noted that the present invention is not restricted to the above embodiment and extensions or modifications thereof are possible: such extended or modified embodiments are also included in the technical scope of the present invention.
Claims
1. A device for feeding paper sheets or the like having
- a feed path whereby paper sheets are fed,
- a distribution unit for distributing said paper sheets that are fed thereto by the feed path, and
- a stacking unit that holds said paper sheets distributed by said distribution unit,
- wherein said stacking unit comprises:
- (1) a rotary feed unit having
- (a) a rotary shaft;
- (b) a plurality of gripping claws that extend in a spiral fashion with respect to said rotary shaft and grip and feed one edge of a paper sheet therebetween;
- (2) an extraction unit that extracts said paper sheets fed by said rotary feed unit from said gripping claws;
- (3) a stage that conforms with said rotary feed unit and that holds between itself and said rotary feed unit one edge of said paper sheet that has been extracted from said gripping claws; and
- (4) a stopping element that abuts one edge of a paper sheet that is held on said stage.
2. The device for feeding paper sheets or the like according to claim 1, further comprising
- a suction feed unit arranged above said rotary feed unit, that suctionally attaches thereto the other end of said paper sheet and thereby feeds this other end.
3. The device for feeding paper sheets or the like according to claim 2,
- wherein said suction feed unit comprises:
- a suction fan that applies suction to said paper sheets; and
- a suction feed belt that feeds said other end of said paper sheet to which suction is being applied at a surface, passing over said suction fan, facing said rotary feed unit.
4. The device for feeding paper sheets or the like according to any of claims 1 to 3,
- wherein said stage comprises:
- a groove with which part of a periphery of said rotary feed unit conforms in a manner such as to permit rotation, and that holds said paper sheet between itself and said periphery.
5. The device for feeding paper sheets or the like according to any of claims 1 to 3,
- wherein a gap between said stage and said rotary feed unit is variable in accordance with a quantity of sheets loaded.
6. The device for feeding paper sheets or the like according to claim 4,
- wherein said gap between said stage and said rotary feed unit is variable in accordance with a quantity of sheets loaded.
Type: Application
Filed: Oct 30, 2009
Publication Date: May 6, 2010
Inventors: Tadashi OBARA (Tokyo), Makiko Obara (Tokyo)
Application Number: 12/609,887
International Classification: B65H 5/12 (20060101); B65H 5/22 (20060101);