JPS61206753A - Automatic paper feeding device - Google Patents

Abstract

PURPOSE:To enable sheets to be positively separated one by one and transferred without both any folding of the sheet and damage made by providing a sheet stopper which is in an evacuation position when separating members are in operation, but is in a stop position when the sheet transfer operation is resumed making the separating members inoperative. CONSTITUTION:The lowermost sheet S1 of sheet groups is frictionally separated while a separating roller 26 is pressed on a separating belt 25 with pressure allowing the sheet to be transferred to No.2 paper feeding roller 30 by means of the separating belt 25. Subsequently, a link 27A and 27B is pulled by a solenoid 28 allowing the separating roller 26 to be separated from the separating belt 25. This causes the tip end 29A of a sheet stopper 29 to rotate clockwise while it is pushed by the link 27A allowing it to No.2 position. At this No.2 position, the lower end surface 29B of the sheet stopper 29 holds the tip end of following sheet groups with exception of the sheet S1 preventing the groups from passing through underneath the separating roller 26. Under this condition, the tip end of the sheet S1 which is held by No.2 paper feeding roller 30, is transferred to a transfer belt 34 located on a subject copy table 50 by means of the separating belt 25.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a paper conveyance device, and more particularly, to a processing device that processes paper by holding it in a horizontal position at a predetermined position, conveys the paper to the predetermined position, stops the paper, and resumes conveyance of the paper after processing is completed. The present invention relates to a device for conveying paper to the predetermined position.

[Conventional technology]

Generally, when making multiple copies of a document consisting of multiple sheets of copy paper or manuscript paper (hereinafter referred to as sheets), first, place the first sheet on the document table and copy a predetermined number of copies, then copy the first sheet. In place of the second sheet, a second sheet is placed on the document table and a predetermined number of copies are made, and in the same manner, all the sheets are sequentially placed one by one on the document table and a predetermined number of copies are made. On the other hand, the copies with the first sheet copied are sorted into separate locations one by one, and the copies with the second sheet copied are stacked one by one on top of them, and subsequent copies are made in the same way using a pan. It is common practice to copy multiple copies of multiple documents by stacking them one by one, but such work is extremely complicated and time-consuming. For this reason, sorters (automatic sorting devices) have been commercialized as devices that automatically sort the copies one by one, but a sorter requires a large amount of space to sort 20 or 30 or more copies. This was indispensable, and moreover, it was time-consuming to take out the sorted documents one by one from their respective stacking positions. Recently, when stacking documents consisting of multiple sheets, the first sheet is transported onto the document table, one copy is made, and then the document is returned to its original stacking position. , then transport the second sheet of paper onto the document table and
After copying just the copy, return it to the original stacked position of the documents,
After that, copy all the sheets one by one in the same way, return them to the original document stacking position, make only one copy of the document consisting of all the sheets, and then repeat the above operation. For example, a device that made a predetermined number of copies of documents using
Publication No. 18, Japanese Utility Model Publication No. 51-55445 and its full text, Japanese Patent Publication No. 55-27343, Japanese Patent Publication No. 55-5544
Various proposals have been made in Publication No. 6-37538 and the like. However, in this type of device, the following items must be carried out reliably. In other words, (1) To reliably separate sheets one by one from a stack of documents and send them out. This is because if two or more sheets are fed multiple times, the number of copies of the document produced will be insufficient. (2) Correctly convey the sheet separated from the document to a predetermined position on the document table. This is because if the sheet is not placed correctly on the document table, it will not be possible to copy correctly, and a group of originals may be missing or
This is because a slanted copy may be created. (3) Each sheet of the document must not be damaged, such as wrinkles or tears. This is especially important when there is no backup of the manuscript. (4) Correctly return the copied sheet to its original document stacking position. This is because if the paper is not correctly returned to its original document stack position, it will interfere with subsequent copy preparation. (5) Regardless of the size or thickness of the sheets to be copied, each operation such as conveyance, copying, and return to the original stacking position must be performed reliably. This is because sheets constituting a document may include sheets of different sizes and thicknesses. Of the above matters, especially regarding (1), the sheet (
2. Description of the Related Art Various devices have been proposed in the past for reliably separating sheets of paper (original documents or sheets for copying) one by one. In FIG. 8, (a) is a mechanism that presses the separation member 2 against the delivery row 21 and sends out the sheets S, which have been conveyed to the separation section by the conveyance roller 3, one by one starting from the bottom layer. (b) shows a reversing row 2 instead of the separating member 2 in (a) above.
11 was used. In (c), a reversing belt 12 is used in place of the reversing roller 11 in (b). In (d), the reversing roller 13 is connected to the two delivery rollers IA
and IB, with a predetermined overlap amount d, and the separation operation is performed using the rigidity of S. 6 In any of the above cases, the coefficient of friction of each member is taken as follows. , the material of each member is selected so that the relationship shown below is established, and performs a predetermined separation function. Coefficient of friction between the sending member (1) and sheet S: μ9 Coefficient of friction between the separation member (2, 11, 12, 13) and the sheet S: 2 μ8 Coefficient of friction between the upper and lower surfaces of the sheets: 2 μ. μ 〉 μ 〉 μ BC

[Problems to be solved by the invention]

With 5DF (manual document feeder) and ADF (automatic document feeder), the document is separated only once, but with RDF (circulating automatic document feeder), the document is separated many times. The following problem occurs because the separation operation is performed using (1) Since the separating member is always in a pressed state, the surface of the document is abraded during the separating operation. In particular, when the original document is a pencil original, when the original document is fed in the direction indicated by the arrow in FIG. The surface of the document is rubbed, causing pencil writing to smudge or smear, or to erase pencil writing. (2) Since one of the separation members is in a fixed state or constantly rotates in reverse during the separation operation, the leading edge of the document tray may collide with the fixed separation member when entering the separation section; If a force is applied in the opposite direction to the conveyance direction, the
) The leading edge of the manuscript paper may be bent, curled, or wrinkled, and in serious cases, it may be torn.

[Means to solve the problem]

This invention eliminates the drawbacks of the prior art as described above, and reliably separates sheets one by one without causing scratches on the sheet surface of originals or copy paper, or bending or damaging the leading edge of the sheets. The purpose of the present invention is to provide a paper conveying device for paper feeding. Furthermore, another object of the invention is to achieve the above-mentioned operations in a compact configuration. The automatic sheet feeder of the present invention that achieves the above object is an automatic sheet feeder that feeds a single sheet by frictionally separating sheets to be fed one by one stacked on a sheet loading table. The paper device is composed of a separation device consisting of a friction member that separates and conveys sheets and another friction member that presses against and separates from the friction member, a sheet stop member, and a sheet conveyance member, and the separation device separates and conveys a sheet. The sheet is separated by friction and then fed.
After the leading edge of the sheet is held between the sheet conveying members,
After the sheet stopping member is moved to come into contact with a group of sheets other than one sheet to be conveyed and to prevent the sheet from advancing, the pressing operation of the separating device is released and the sheet conveying member is allowed to feed the sheet. It is characterized by what it has done.

【Example】

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. FIG. 1 shows an automatic document handling device to which an automatic paper feeder according to the present invention is applied. This automatic document handling device is equipped with a setting stand 21 on which sheets S made up of a plurality of sheets of paper are set in a stacked state. First paper feed rollers 22A and 22B are provided on the right side of the set table 21 in the drawing. At the right end of this set table 21 is a slit plate 2.
There are 3. In the figure, 20 is a separation device. An enlarged view of the separation device 20 is shown in FIG. This separation device 20 includes a roller 24A. A separation belt 25 suspended between the separation belts 24B, a separation roller 26 that faces and presses onto the separation belt 25, and a link 27A that presses and releases the separation roller 26. 27B, a thread maid 28 that provides drive to the link mechanism 27, a sheet stopping member 29, and a w&2 paper feed driven roller 3.
0.31 and an id plate 32. In front of the guide plate 32, a conveyor belt 34 is disposed on a document table 50 of the copying apparatus and stretched between rollers 33, 33. A stop member 40 is provided at the left end in the figure of the document table 50 at a predetermined copying position, and a paper discharge guide 35 and paper discharge rollers 36A and 36B are further provided from the left side to the top in the figure. *#, A sheet receiving plate 37 is fixed to one end of the guide 35, and further to the right of the plate 37 is provided a paper aligning belt 39 rotated by rollers 38A and 38B. A plurality of sheets S set in a stacked state on the setting table 21 between the end of the paper alignment belt 39 and the abutting plate 23 is connected to the first paper feed roller 22A. 22B, several sheets of the lower layer reach the slit plate 23 and pass through the lower gap to the separation device 20.
Move up to. Here, the sheet S is subjected to a separating operation by the separating device 20 to separate only the lowest sheet SI, which is then conveyed by the separating belt 25 and reaches the second paper feed rollers 30 and 31, and is then placed on the side plate 32. The sheet is then conveyed by the conveyor belt 34 on the document table 50 until the leading edge of the sheet reaches the stop member 40 . Then, in this state, only one copy is copied, and when the copying is completed, the stop member 40 is released, and the sheet SL is moved along the conveyance guide 35 by the conveyance belt 34 to the discharge roller 3.
6A and 36B, followed by the paper ejection roller 36A. 36B leads to the paper alignment belt 39, and the paper alignment belt 3
9, it is returned to the top of the sheet S on the set table 21. Then, the sheet S2, which was initially the second sheet from the bottom, is separated from the lowest position in the same manner as described above, fed and conveyed, and stopped at a predetermined position by the stop member 40. Only one copy is copied, and once the copying is completed, the stop by the stop member 40 is released, the sheet is conveyed again, the sheet is ejected, and the sheet S is returned to the uppermost position at that time on the set stage l. Thereafter, in the same manner, the total number of original sheets S) is fed, conveyed, stopped, one copy is copied, conveyed and discharged, and each time the sheet S is returned to the top of the sheet S on the setting table 21.
One copy of S) will be created, consisting of all the copies of the sheets of paper that make up the paper, and by repeating this process as many times as necessary, a predetermined number of copies of S) will be created. becomes. Next, the movement of the separating device 20 will be explained with reference to FIG. 3 (aL(b)). FIGS. In Fig. f53 (a), the sheet group
, 22B in the direction of the separation device °20, and the tip is regulated by the slit plate 23 so that only the group of lower layers is further transported. At this time, the separation roller 26
The plunger 28A of the solenoid 28 is in an extended state and is in a state where it is pressed against the separation belt 25 via links 27A and 27B. One group of sheets is slit plate 2
3 to the separation roller 26, where only one sheet Sl of the bottom layer is separated and separated, and a portion is conveyed to the paper feed roller 30 by the separation belt 25. At this time, the sheet stop member 29 is in the first position where it does not interfere with sheet conveyance, as shown in the figure. In FIG. 3(b), the solenoid 28 is the link 27A. By pulling 27B, the pressure on the separation roller 26 is released. At the same time, the tip end 29A of the sheet stop member 29 is
Pushed by the side surface of the swinging link 27A, it rotates clockwise as shown, moves to the second position, and stops. In this second position, the lower end surface 29B of the sheet stop member 29 is
The separation belt 25 and the separation roller 26 are located almost on an extension of the external tangent line when they were in pressure contact as shown in FIG. 3 (&). As a result, the lower side surface of the sheet stopping member 29 presses the leading ends of the following sheets other than S1 and prevents them from passing under the separation roller 26. In this state, S, whose leading end is held between the second paper feed rollers 30, passes through the second paper feed rollers 31 by the conveyance force of the separation belt 25, and is further transferred to the document table 50.
It is sent to the upper conveyor belt 34. Figure 4 is similar to Figure 3 (
It is a perspective view seen from the slit plate 23 direction in the state of b). (The slit plate 23 is omitted.) A friction member such as urethane rubber or silicone rubber is used as the separation roller 26, but it transmits the sleeve torque of the sleeve until the force applied to the roller circumferential surface reaches a certain value. It is desirable to have a limiting power transmission means (a so-called torque limiter) that sets the torque to a free state when the value exceeds this value. The configuration of the torque limiter will be explained with reference to FIG. The separation roller 26 is attached to a separation roller boss 62 that is rotatably fitted onto the separation roller shaft 61, and is located on one end surface of the separation roller boss 62, so that a spring joint 63 is attached to the separation roller boss 61. is fitted externally. One end of this spring joint 63 is connected to the separation roller shaft 61.
The other end of the spring joint 63 is fixedly held by a fixedly attached spring support member 64. It is configured to be fitted onto the outside while being tightened at its inner diameter. And spring joint 6
The separation roller 26 transfers the pongee torque of the separation roller shaft 61 to the attached separation roller boss 6 by the friction force between the inner diameter part of the separation roller 26 and the outer peripheral surface of the cylindrical part 62a of the separation roller boss 62.
2. The function of the torque limiter will now be explained with reference to FIGS. 6(a) and (b). When a torque limiter is used for the separation roller 26, it is common to apply rotational torque in a constant direction D2 to the shaft 61. FIG. 6(,) shows a case where the separation operation has been performed and there is one sheet S1 between the separation roller 26 and the separation belt 25. At this time, each member The coefficient of friction between the separation belt 25 and the sea) 3 has the following relationship: 2μ to 1ll
The coefficient of friction between I7-226 and the sheet S is 2μ. μ 〉 μ, μ 〉 μ80
At the time of B, by setting the limit value of the torque limiter to be less than the pongee torque generated based on the pressing force of the separation row 226 and the friction coefficient μ, the separation roller 26 can move the pongee 61
It becomes free between the two and rotates in the direction D1 of the arrow shown in the figure. As shown in FIG. 6(b), if the separation is insufficient and two sheets S, S, are formed between the separation roller 26 and the separation belt 25. S, the friction coefficient μ between the sheets becomes smaller than the friction coefficient μ,μ between the sheet S and the separation row 226 or between the sheet S and the separation belt 25, so that the Torque is that*ma separation low 22
6 and rotates in the direction of D3. Follow me)
S2 is returned in the opposite direction to the conveying direction to prevent double feeding, and only S+ is sent. As explained above, in the separating operation, the separating roller 26
Since the pressure bonding of the separation roller 26 is released, direct contact between the separation roller 26 and the sheet surface is limited to the tip portion. Specifically, Figure 3 (
In a), the length between the separating roller 26 and the second paper feed roller 30 is limited to Ω, and this length is generally about 10 to 20 −1. Therefore, even if the sheet S is a pencil original, the wrinkles on the original surface are limited to this range, and in many cases, this area is generally a blank space, so it is extremely unlikely to be a problem in practice. Furthermore, if a torque limiter is used as the separation roller 26, not only will the reliability be improved by returning the sheet S in the opposite direction, but in the case of a single sheet, the torque limiter will become free from the transfer 61 and follow the rotation direction of the separation belt 25. Therefore, unlike when a fixed separating member or a reversing roller (belt) is used, a force in the opposite direction is not applied to the leading edge of the sheet, so there is no possibility of damage such as bending or tearing the leading edge of the sheet. FIGS. 7(a) and 7(b) are perspective views of a separation device showing another embodiment of the present invention. Although the sheet stopping member 29 of the separating device is stopped and released by rotating around the rotation axis, as shown in the figure, it is also possible to use a solenoid 48 or the like to directly stop and release the sheet by moving it up and down. . FIG. 7(a) shows that the sheet stop member 49 is pulled up and
S indicates a release operation state in which passage is possible. At this time, the bent portion 49A of the sheet stop member 49 comes into contact with the upper fixing plate 47 to be at the upper stop position. FIG. 7(b) shows the stopping operation when the plunger 48A of the solenoid 48 is extended. As a result, the sheet stop member 49 is pushed down and presses against the outer peripheral surface of the separation belt 25. In this state, the sheet S is prevented from advancing and stops. In the above embodiments of the present invention, the copied sheet is returned to the original document stacking position, but the invention is not limited to this. For example, the copied sheet is returned to the original document stacking position. It goes without saying that the present invention can also be applied to a device for transporting the present invention to a predetermined position other than the above, and can also be applied to a processing device that performs appropriate processing other than copying.

【Effect of the invention】

As described above, according to the automatic paper feeder of the present invention, the sheet stopping member is in the retracted position while the separating member for preventing double feeding of fed sheets is in the operation of frictionally separating the sheets in a crimped state. When the frictional separation is released and the sheet is conveyed, it moves to the stop position that prevents the double feeding of subsequent sheets, which improves the reliability of the separation performance in bottom-feeding automatic sheet feeding, and prevents non-feeding. It is possible to prevent single feeding, image loss on the sheet surface, damage to the leading edge of the sheet, etc., and it is now possible to separate and feed a wider range of paper types than before.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an automatic document handling device to which a paper conveying device according to the present invention is applied, and FIG. 2 is a partially enlarged view of the separating device. 3(a) and 3(b) are diagrams for explaining the operation of the separation device, and FIG. 4 is a partial perspective view thereof. FIG. 5 is a perspective view of the torque limiter, and FIGS. 6(a) and 6(b) are diagrams for explaining the operation of the torque limiter. Figure 7(a), (
b) is a perspective view of a separation device showing another embodiment according to the invention; FIG. 8 is a diagram illustrating various conventional separation devices. FIG. 9 is a diagram showing defects in sheets fed by a conventional separating device. 22 A, 22 B...First paper feed roller 23.
...Slit plates 24A, 24B ...Rollers 25 ...Separation belt (sheet conveyance belt) 26
... Separation roller 27 A, 27 B ... Link 28.48...
... Solenoid 29.49 ... Seat stop member 30.31 ...
...Second paper feed roller 32...Guide plate S, S,, S2...Sheet applicant Roku Konishi Photo Industry Co., Ltd. 1'J Pi (/1. ) V co'tJ times -LAJJ Figure 5 2 Figure 6 (α) (b)

Claims (1)

[Claims] In an automatic sheet feeding device that feeds sheets by frictionally separating them one by one from sheets stacked on a sheet loading table, a friction member for separating and conveying the sheets and a friction member for separating and conveying the sheets are used. It is composed of a separating device consisting of another friction member that presses and separates, a sheet stopping member, and a sheet conveying member. After sandwiching the sheet, the sheet stopping member is moved so that it comes into contact with a group of sheets other than the one sheet being conveyed to prevent the sheet from advancing, and then the pressing operation of the separating device is released and the sheets are fed by the sheet conveying member. An automatic paper feeder characterized in that it is configured to perform operations.