JPH043785A - Document automatic circulation feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 1! Upper section ■Anti-distribution The present invention feeds originals one by one from a document stack consisting of a plurality of documents to a predetermined document exposure position, returns the exposed document 1 to the top of the document stack, and circulates it repeatedly. The present invention relates to an automatic document circulation feeding device that feeds a document to an exposure position.

When making multiple copies from a multi-page original using a Moxibustion Technique Copy Machine, it is possible to automatically feed the original onto the contact glass of the copy machine to save time by stacking the pages in the order of pages. 1 from the bottom of the document stack placed on the document placement table
The originals are extracted sheet by sheet and fed onto the contact glass of the copying machine, and the exposed originals are returned and stacked on top of the stack of originals placed on the original platen to make a number of copies. An automatic document circulation feeding device (Recycle) feeds each document onto a contact glass by repeatedly circulating each document in page order through a circulation path consisting of a paper feed path and a return path a number of times corresponding to
automatic docu＋++ent fee
der (hereinafter abbreviated as RADF) is used.

In the conventional automatic document circulation feeder (RADF),
The originals are circulated by the number of copies desired to be made, and each time the originals are circulated, the originals are restacked on top of the original stack on the original table. Therefore, unless the stackability of originals is improved and the originals are not stacked without causing skew as much as possible, the accuracy of transporting the originals will decrease and the quality of each image will also be affected.

In the conventional RADF, a side fence and an abutment plate are provided on the document table to regulate and align the positions of the documents to be restacked. However, documents are used in a wide range of sizes from B5 horizontal size to A3 vertical size, and in order to accommodate the various sizes, the ejection unit of the ejection section is configured to be moved according to the size of the original. In such a structure in which the ejection unit is moved, the side fence cannot be made longer than the length corresponding to the minimum document size, for example, B5 horizontal size. For this reason, in the case of large-sized documents, the latter half of the document moves away from the side fence, and the side fence's positional regulation is not effective. Therefore, stackability is not improved for large-sized originals.

In order to ensure alignment of documents, side fences are sometimes configured in a jogger type, but this has the problem of increasing the size of the device, and furthermore, the length of the side fences is short, so the jogger effect cannot be fully utilized. was there.

Problems to be Solved by the Invention The present invention solves the above-mentioned conventional problems and provides an automatic document circulation feeding device that can reliably stack documents of various sizes with corrected skew using a simple device. is the issue.

The present invention solves the above-mentioned problems by providing a document placing table for placing a document stack consisting of a plurality of originals, and a document placing table for placing a document stack consisting of a plurality of originals, and a document placing table for placing a document stack on the document placing table with the front end thereof aligned at a predetermined position. A paper feeding unit that has a paper feeding member that pulls out the lowest original from a stack of placed originals, and a means that separates the pulled out originals and feeds them one by one, and the originals fed from the paper feeding unit are Transport it to the exposure position,
a conveying section having a conveying means for discharging the original after exposure of the original; a document ejecting section for returning the original discharged from the conveying section through a reversing path so as to overlap with the stack of originals placed on the document placing table; In the automatic document circulation feeding device, the document fed from the paper feeding unit is placed on the document regardless of the method of positioning the document at a predetermined feeding time determined according to the number of circulation feeding times. The problem was solved by an automatic document circulation feeding device that is characterized by reversing the document on a placement table and positioning the document by abutting it against a predetermined member.

In the working RADF, the original is fed, positioned at the exposure position, and stopped. There are two methods for positioning and stopping: a non-contact positioning method that detects that the document has passed a predetermined position, and then stops at a predetermined timing from that detection point, and a butt positioning method that positions the document by abutting it against a positioning member. There is.

When the butt positioning method and the non-butt positioning method are selectively used, or when only the non-butt positioning method is used, the skew of the document is avoided when the document is fed by the non-butt positioning method. There is no opportunity to correct it, and the skew gradually increases during repeated recirculation.

In the RADF according to the present invention, at a predetermined feeding time determined according to the number of circulating paper feeds, for example, every 10th feeding, the document is fed backward toward a predetermined member, for example, a scale, which always positions the document, and the document is abutted and positioned. Add a process to For example 30
When the original is circulated 30 times to make copies, even if the original is positioned using the non-stop positioning method, for example, when copying the 10th or 20th sheet, all originals will reach the specified position. The document is fed, stopped, and then the document is fed slightly backwards to perform abutment positioning. When performing abutment positioning, the document is not only positioned but also corrected for skew.

By performing abutment positioning at a predetermined time, the skew of the original is corrected, and even when the original is circulated, the skew is corrected in a timely manner, improving the stackability of the original and improving the conveyance quality.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side sectional view showing the overall configuration of a RADF as an embodiment of the present invention. This RADF is the copying machine body 1
A paper feed table 1 is provided in a cover-type case that covers a contact glass 101 provided on the top surface of the contact glass 101, and a paper feed table 1 is provided over an area excluding the left and right ends of the upper part of the case, and a paper feed table is provided at the left end in the figure. A paper feeding unit 70 consisting of a paper feeding mechanism that sequentially feeds sheets of paper onto the contact glass 101 from the bottom of a stack of paper stacks placed on the contact glass 101, and a downward running part slidingly contact each other over the entire length of the upper surface of the contact glass 101. A transport unit 71 includes a transport belt 12 that transports the original fed from the paper unit to a predetermined original exposure position on the contact glass and discharges the original from the contact glass after exposing the original, and a transport unit 71 that inverts the original sent from the transport unit. The reversing unit 72 is configured to include a reversing unit 72 for reversing the original, and a document ejecting unit 73 for returning the original reversed by the reversing unit onto the stack of originals on the paper feed table 1.

Hereinafter, each of the paper feeding section, conveying section, reversing section, and document ejecting section will be explained in order.

Paper Feeding Unit> Side fences 2 are provided on both left and right sides of the front portion of the paper feeding table 1 within the minimum document placement range with respect to the conveying direction. Near the front end of the paper feeding table 1 in the paper feeding direction, two calling rollers 3a and 3b having an inlet are placed back and forth in the conveying direction at a position that does not protrude from the document placement surface when the inlet is up. It is provided. Calling roller 3a,
As shown in FIG. 2, the shaft of 3b is provided with a slit plate 60 having a slit 61 at the end of the shaft that is detected by a photoelectric sensor 62, and a positioning plate 63 with a recess at a position corresponding to the insertion part of the calling roller. and a positioning plate 6.
A pressing roller 64 biased by a spring is engaged with the peripheral edge of 3. These mechanisms allow two calling rollers 3a.
, 3b rotate in synchronization so that the inner parts thereof are parallel to each other with the same phase, and the slit plate 61 and the photoelectric sensor 62 detect the rotation angle at which the paper feed table 1 and the inner part are on the same plane. It is stopped, and is reliably positioned and held at that position by the positioning plate 63 and the pressing roller 64.

Above the calling roller 3a, there are
As shown in FIG. 1, a stopper 5 is provided which is rotated by a solenoid 67 about its rear end as a fulcrum and is displaced between a retracted position shown by a broken line in FIG. 1 and an operating position shown by a solid line. In the operating position, the toe of the stopper 5 comes into contact with the top surface of the table 1 or the top surface of the stack of originals set (see FIG. 3(b)).
, functions as a set claw when setting a stack of originals, and
It has a function of pushing down the leading edge of a document and pressing it against the calling roller 3a, and a partitioning and skew correction function by abutting the leading edges of the documents that are circulated and returned from the rear onto the stack of documents on the table 1. A stopper sensor 85 is provided at the shaft end of the stopper 5 to detect that the stopper has come into contact with the paper feed table 1 .

The document stack stacked on the calling rollers 3a, 3b by the stopper 5 is caused by the synchronous rotation of the calling rollers 3a, 3b and the pushing plate 82 in the paper discharge unit 18, which will be described in detail later, on the calling rollers 3a, 3b. By pushing out the rear end of the document bundle in synchronization, the document bundle is reliably conveyed to the separating section. The neutral number 6 in FIG. 1 is a document set sensor, which detects that a bundle of documents is set on the table 1, and based on the detection signal, rotates the calling rollers 3a, 3b by a certain amount, and controls the pushing plate 82. is activated to move the document stack to the position shown in Figure 3 (
Transport it to the position shown in b).

The calling rollers 3a and 3b further include an endless belt 7.
It also has a function of reliably feeding the lowest sheet of the stack of documents at the above position in cooperation with a separation section consisting of a separation roller 8 and a separation roller 8. The separation roller 8 rotates in the direction in which the original is transported in the direction in which the peripheral speed becomes the original transport speed, while the endless belt 7 is in pressure contact with the separation roller 8 over its part in the opposite direction to the original transport direction. direction (direction indicated by arrow A in FIG. 1) at a low speed of, for example, about 1/2 of the document conveyance speed, and the coefficient of friction between the separation roller 8 and the document and the friction coefficient between the endless belt 7 and the document are By appropriately setting the friction coefficient of
If it is a sheet, leave it as it is\downstream pull-out rollers 9, 10
If there are two or more sheets, only the lowest one is separated and transported toward the pull-out rollers 9 and 10.

The separation roller 8 has a built-in one-sided clutch, and when the document is conveyed by the pull-out rollers 9 and 10, the separation roller 8
Even if the drive of the document is turned off, the document rotates with the movement of the document, lightening the document conveyance load and conveying the document at a predetermined speed. The separation roller 8 is driven on and off by a clutch (not shown), and when the registration sensor 11 provided at the discharge section from the paper feed section 70 to the conveyance section 71 detects the leading edge of the document, the clutch is turned off and the drive to the separation roller 8 is turned off. Drive is cut off.

The registration sensor 11 also serves as a detection means for detecting the trailing edge of the document and controlling the document to stop at a predetermined exposure position on the contact glass 101.

The above-mentioned calling rollers 3a, 3b, separation roller 8, and pull-out roller 9 can be driven by a single motor or by separate motors.

<Conveyance Unit> The conveyance unit 71 is composed of one wide conveyance belt 12 wrapped around a pair of rollers 65 and 66, and the lower running part of the belt is pressed against the contact glass 101 by a plurality of pressure rollers 13. There is.

In the conveying section 71, there are a butting mode and a non-butting mode for determining the stop position of the conveyed document.

In the abutting mode, the document fed from the paper feed section 70 is stopped once a certain distance to the right from the predetermined exposure position (the right end of the left scale 68), and then the conveyor belt 12 is driven in reverse to move the document. By conveying the document an excessive distance to the left, the document hits the right end of the scale 68 and stops. In this way, the skew of the document is corrected and the accuracy of the stopping position is increased. On the other hand, in the non-abutment mode, the drive of the conveyor belt 12 is controlled so that the document sent from the paper feed section 7o just abuts against a predetermined exposure position (the right end of the scale 68) and stops.

At this time, the accuracy of the stopping position of the document is better in the abutment mode than in the non-abutment mode.

The original transported to the exposure position in this manner is sent to the reversing section 72 by the transport belt 12 after the exposure is completed.

<Reversing section> The reversing section 72 includes a reversing roller 15 provided along a reversing guide, a pressure roller 16 that presses against the reversing roller 15, and a position indicated by a solid line and a broken line in FIG. 1 on the downstream side thereof. A displaceable switching pawl 14 is provided between them. The switching claw 14 is
In the double-sided original mode, the switching claw 14 is switched to the position shown by the broken line, and when the single-sided original mode is switched to the position shown by the broken line, and the original with one side exposed is reversed and sent to the transport section 71 again, or when the double-sided exposed original is discharged in the open-sided original mode. is located at the position indicated by the solid line in the figure, and is discharged to the document discharge section 73. A reversing sensor 17 is located between the pressure roller 16 and the switching claw 14 and facing the reversing roller.
is provided, thereby controlling the drive timing of the conveyor belt 12. The conveyor belt and the reversing roller are each driven by a single motor (not shown).

Original ejection section> The original ejection section 73 moves the document over the paper feed table 1 in the original transport direction (
Paper ejection unit 1 movable in the horizontal direction (in Fig. 1)
8 and the rear part of the paper discharging unit in the transport direction, expands and contracts according to the movement of the paper discharging unit 18, and forms a document reversal path between the upper surface of the paper feeding table 1 and the rear part of the paper discharging unit 18. A plurality of guide plates 21, 22, 23, reversing part 72
It is configured to include an intermediate belt 27 for conveying the document ejected from the paper to the paper ejection unit 18.

The above multiple guide plates (three guide plates in the example shown) 2
1, 22, and 23 are arranged in a partially overlapping state and move relative to each other to form one extendable and retractable guide section, and by moving the paper discharge unit 18, each guide plate 21, 22 , 23 are changed to expand and contract. Each guide plate 21, 22,
The guide plates 23 are arranged so as to overlap one after another outward in the order of the document conveyance direction, so that the front end of the document conveyed through the return path does not get caught in the overlapping portion of the guide plate. Above each guide plate 21, 22, 23 are exterior covers 24, 25, respectively.
．． 26, the rear end of which is fixed to a rising portion formed by bending the rear end of each guide plate upward, and is provided so that it can be expanded and contracted by being stacked on top of each other like the guide plates. 4 to 6 show the guide plates 21, 22, 23 and the exterior cover 24, 2.
5.26 is a diagram showing an extended state, an intermediate state, and a contracted state. These figures show the storage process in a state where the rear ends of the guide plate 23 and the exterior cover 26 at the rear end (right end in the figures) coincide with the rear end of the RADF.

However, the rearmost guide plate 23 and exterior cover 26 are not fixed at this position.

It is possible to slide between the position shown by the solid line in FIG. 1 and the position shown by the chain line. When the guide plates 21, 22 and 23 are extended and their rear ends are positioned at the position indicated by the solid line, the distance between the front end surface 40 of the paper ejection unit 18 and the contact surface of the document front end surface of the stopper 5 is the minimum. The distance is set to be slightly longer than the length of the original. Then, the rear end of the rearmost guide plate 23 and the exterior cover 26 are aligned with the rear end of the RADF as shown by the chain line in FIG. That is, the sixth
When the state shown in FIG. It is set up for long distances. When the length of the document is between the minimum document length and the maximum document length, the guide plate and exterior cover are expanded and contracted accordingly, and the front end of the document is brought into contact with the front end surface 40 of the paper ejection unit 18 and the stopper 5. The distance to the surface may be slightly longer than the length of the document. That is, the front end surface 40 of the paper ejection unit 18 serves as a rear guide when placing a document on the paper feed table 1.

As shown in detail in FIGS. 6 and 7, the paper ejection unit 18 directly receives the original ejected from the outlet 30 of the reversing section 72.
Alternatively, a lower guide 29 inclined at a front end that scoops up the document conveyed by the intermediate belt 27 on the table 1, which is the return surface of the return path, and guides it to the discharge port at the upper part of the front end, and The upper guide formed as the front end of the guide plate 21 and the pair of paper ejection rollers 19'' and 19' provided at the entrance and exit of the paper ejection unit transport path formed between these and the paper ejection roller pairs 19'' and 19', respectively. It has a motor 20 that drives a paper roller.Furthermore, the front part of the exterior cover 24 serves as an exterior cover for the paper discharge unit 18.

The intermediate belt 27 is provided forward of the outlet 30 of the reversing section 72 and is divided into a plurality of strips in the width direction so that the upper surface of the upper running section thereof is flush with the upper surface of the document table 1. When the guide 22 is extended, a driven roller 28 is provided via a leaf spring at a position facing each strip of the intermediate belt, as shown in FIGS. 4 and 7, and the guide 22 is pulled out in the direction of arrow B. When the document is placed above the intermediate belt 27, the driven roller 28 presses against the intermediate belt 27 due to the force of the plate spring and conveys the document, and the guide 22 moves in the direction of arrow C in FIG.
If the intermediate belt is retracted backwards from above, the driven roller 2
8 is flipped up by a protruding member 31 that protrudes above the table surface, retreats from the intermediate belt 27, and is stored rearward from the reversing section outlet 30 as shown in FIG. In this state, the maximum size document discharged from the reversing section outlet 30 is conveyed along the paper discharge unit conveyance path by the discharge roller pair 19''19' without being obstructed by the driven rollers or the guide plates 22, 23, and is transported to the front edge. The documents are then ejected onto the document bundle placed on the document table, collide with the stopper 5, correct the skew, and are stacked on the document bundle.

A seventh paper feed table 1 is provided between each strip of the intermediate belt 27 and in a range that becomes a return path due to the movement of the paper discharge unit 18.
As shown in the figure and FIG. 12, a plurality of parallel grooves 55 extending in the document transport direction are provided, and the lower end of the lower guide 29 has a comb-like shape that fits into these grooves 55 so as to be able to move smoothly. A protrusion 29a is provided. As a result, the document conveyed by the intermediate belt 27 and the driven roller 28 is reliably and smoothly scooped up by the lower guide 29 and discharged through the discharge section, regardless of the position of the discharge unit 18. The distance from the ejection roller pair 19'' and the pressure roller 16 of the reversing section to the driven roller 28 is set to be shorter than the length of the corresponding document size in the transport direction at any position of the ejection unit 18. This allows documents of any size to be transported smoothly without any problems.

In addition, since a belt is used as a means for conveying the document discharged from the reversing section outlet 30 to the paper discharge unit 18, the belt will not move even if the guide plate is displaced depending on the document size and the driven roller 28 is displaced over a considerable range. It becomes possible to engage the Guide plates 21, 22, 2 that can be expanded and contracted by stacking
3.As a means for slidably supporting the exterior cover 24, 25, 26 and the paper discharge unit, as shown in FIG.
A shaft 33 with a circular cross section is provided on the back side when viewed from the DF operator and extends parallel to the document conveyance direction over the entire sliding range of the guide plate, exterior cover, and paper ejection unit. Exterior cover unit and paper ejection unit 18
A circular hole in a support part provided on the back side of the support part is slidably fitted into the support part.

Links 35, 36, 3 are provided on the back and front sides of each guide plate 21, 22, 23 over approximately the entire length of each guide plate.
7 is fixed to the guide plate 21.23, and the link 35.37 fixed to the guide plate 21.23 has a slit 35a extending almost the entire length.
37a, and two engaging pins 34' implanted at the ends of adjacent links at a certain distance in the longitudinal direction.
, 34'' are connected by engaging with the slits 35a and 37a.

A fixed shaft 39 having a length corresponding to the moving distance of the rearmost guide plate 23 is extended on the frame on the front side of the RADF.
A recessed portion of a lever 38, which is swingably provided on the right side of the guide plate 23 and has a recessed portion at its tip, is slidably engaged by its own weight or by a spring force. R
A guide rail 53 and a rack 50 are fixed to other parts of the front frame of the ADF in the document transport direction, and a plurality of rollers 47 provided on the front side plates of the paper ejection unit 18 are connected to the upper surface of the guide rail 53. A pinion 46 provided coaxially with the rollers 47 is engaged with the rank 50 to artificially move the paper discharge unit 18 to a predetermined position according to the document size and stop it. Positioning corresponding to the document size can be easily performed by engaging the click pin 45 provided on the front side of the paper ejection unit with the click groove 51 provided on the front frame of the RADF at a position corresponding to the standard paper size. can. Since the click grooves can be provided quite close together, they can be provided to correspond to various original sizes. However, when feeding an intermediate size original, the tip of the click pin 45 should be inserted into the irregularities on the inner surface of the frame. Secure by engaging with the surface. The click pin 45 can be easily engaged and disengaged from the click groove 51 or the inner surface of the frame by operating the lever 52 provided on the front end surface of the paper ejection unit, and the paper ejection unit 18 can be easily moved and engaged at the desired position. can be combined.

The document conveyance path guide and the outer cover of the paper ejection unit 18 are formed as part of the guide plate 21 and the outer cover 24, respectively, but as shown in FIGS. Magnetic pins 49 are fixed to the front and rear sides of the vicinity of the paper roller pair 19', respectively, so as to protrude downward, and correspondingly, magnetic pins 49 are fixed to the main body side of the paper ejection unit 18. , a magnetic attraction means (permanent magnet) 48 having a slightly long groove transverse to the conveyance direction into which the pin 49 can fit is fixed, and by attracting the magnetic pin 49 to the magnetic attraction means 48, a guide is created. The plate 21 and the exterior cover 24 are locked to the paper discharge unit body and can be easily removed to open the conveyance path. The paper discharge unit 18 is slidably supported on the shaft 33 by support portions 56 provided at two locations on the back side thereof, and one of the support portions supports the guide plate 21 so as to be slidable on the shaft 33. It is sandwiched between the bifurcated supporting parts with almost no gap. Therefore, the paper discharge unit 18, the guide plate 21, and the exterior cover 24 can always maintain their mutual positional relationship, and if the pinion 46 is rotated and the paper discharge unit 18 is moved, the guide plates 21, 22, 23, and Exterior cover 24
．． 25.26 connects the slit of link 35.37 to link 3
As the engagement pins 34' and 34'' of No. 6 slide, they expand and contract accordingly.

Near the front end of the exterior cover 25 of the central guide plate 22, there is a position that does not interfere with storage of the exterior covers 24, 25, 26, and approximately near the center when the exterior covers 24, 25, 26 are extended. A handle 32 is attached at the position.

Therefore, regardless of the position of the guide plates 21, 22.23 and the exterior cover 24, 25, 26, by holding the handles 32 and lifting them, the locks 38 at both ends of the guide plates can be used.
39, 48, and 49 are removed, and the guide plate, exterior cover, and link are rotated as a unit around the shaft 33 on the back side, as shown in FIG. 12, and the document return path can be widened. In this case, each guide plate 21, 22, 23
The links 35, 36, 37 on each side are fixed to two pins 34', 34 spaced apart in the transport direction.
” are joined by engaging the slit, so each side 3
The book links are held in a straight line when viewed from the side, each guide plate and outer cover do not fall apart or both ends sag, and the locks 38, 39 and 48, 49 do not require great force to be applied. Can be canceled.

The position where the paper ejection unit 18 is adjusted to the maximum document size (6th
from the state shown in the figure) to the position that matches the minimum original size (the state shown in the figure)
Links 35, 3 when moving to the position indicated by the solid line in the figure)
The overlapping state of 6 and 37 and changes in the positional relationship with respect to the guide shaft 33 and 39 are sequentially shown in FIGS. 8 to 11. 9 and 10, only the back side is shown for the sake of simplicity. That is, from the state in which the three links 35, 36, and 37 overlap as shown in FIG. 8, the link 35 is pulled out together with the sheet discharge unit 18 and the guide plate 21 as shown in FIG. As shown, the link 36 is pulled by the rear end of the link 35 and pulled out together with the guide plate 22, and finally, all the links are united and the lever 38 slides along the fixed shaft 39 and moves forward.
It comes to a position corresponding to the minimum document size shown in FIG.

When moving from a position corresponding to the minimum original size to a position corresponding to the maximum original size, this is reversed.

By moving the guide plate and the outer cover in this manner, the guide plate and the outer cover are moved backward from the reversing parts opening 30 (to the right in Fig. 1) when the maximum original size is accommodated, and the paper is fed. You can use the table without wasting it. Note that the method of pulling out the links above is just an example, and you may first pull out links 35 and 36 at the same time,
It is also possible to move all of the links 35, 36, 37 along the axis 39.

By the above-described operation, when the paper ejection unit is moved to a position corresponding to the document size, the guide for the document return path and the exterior cover are automatically formed.

Note that the paper ejection unit 18 has the following configurations: FIG. 1, FIG. 3(b),
As shown in FIG. 6, the paper ejection sensor 42 and the paper ejection unit 18
A positioning sensor 44 that detects whether the document set position is correct, and a push plate 82 that pushes out the document bundle are provided. This positioning sensor 44 detects whether the set position of the paper ejection unit 18 is correct by detecting the rear end of the document shafted against the stopper 5. If the trailing edge is not detected, either the paper ejection unit 18 is far away from the rear edge of the document, or the paper ejection unit 18 has moved forward too far and the trailing edge of the document is caught on the front wall 4 degrees of the paper ejection unit. Therefore, document feeding operation is prohibited and paper ejection unit 1 is
Correct the set position of 8. The paper discharge unit 18 can be moved easily and smoothly by pressing and releasing the click on a lever 52 (see FIG. 7) provided on the front surface of the paper discharge unit.

The drive mechanism of the pushing plate 82 is shown in FIGS. 13 and 14, and the movement of the pushing plate 82 is shown in FIG. 15.

The push-out plate 82 is housed so as to be able to protrude into a recessed part of the front plate 40 of the paper ejection unit 18, and in the housed state, its front surface is flush with the outer surface of the other front plate. ing. The extrusion plate 82 is L-shaped when viewed from the side (FIG. 15).

The bottom side 82a passes through a suitable relief hole and is inserted into the paper ejection unit 1.
It is inside 8. A slit 82b is provided on the bottom side 82a of the push-out plate 82 and extends in the document ejection direction, and two pins 87 fixed to the frame of the paper ejection unit 18 are slidably engaged with the slit 82b.

The bottom side 82a of the extrusion plate 82 is attached to a bell crank (L
The lever 83 is connected via a link 81 to a plunger of a solenoid 80 fixed to the paper discharge unit.

Therefore, when the solenoid 80 is de-energized, the push-out plate 82 is moved to the front plate 4 of the paper discharge unit 18, as shown in FIG.
0 (solid line position in FIG. 15), and in the suction state where the solenoid is energized, the push-out plate 82 connects to the slit 82b and pin 87 via the link 81 and the bell crank 83, as shown in FIG. Guided to paper ejection unit 18
The position protruding from the front plate 40 (the position shown by the broken line in Fig. 15)
Move to. When the solenoid 80 is turned off, the extrusion plate 8
2 is returned to its original position by a spring 84.

The movement of the document bundle by the above-mentioned pushing plate 82 will be explained. When a stack of originals collides with the stopper 5 and is set on the original feeding table 1, and when the original setting sensor 6 detects the stack of originals, or after the original has gone around, the stopper 5 is set on the original feeding table 1.
The stopper sensor 85 (Fig. 3(a))
When this is detected, the stopper 5 is released, the solenoid 80 is energized to project the pushing plate 82, and at the same time, the calling rollers 3a and 3b are rotated to move the document bundle to the feeding position where it comes into contact with the separating section. After extrusion, the solenoid 80 is turned off and the extrusion plate 82 is returned to its original position by the spring 84. This operation is repeated every time one job starts.

<Description of Operation> The document feeding operation by the RADF having the above configuration will be described below using the flowchart shown in FIG.

First, a stack of originals stacked in page order with the image side facing upward is placed on the paper feed table 1 with the leading edge of the stack colliding with the stopper 5, and then the side fences 2 are moved to hold both sides of the stack of originals. . Thereafter, the paper ejection unit 18 is set at a position that matches the document size.

When the print key of the copying machine is turned on and a paper feed signal is sent, the stopper claw solenoid and the pusher plate solenoid are turned on, the stopper 5 is retracted from the leading edge of the paper stack, and the pusher plate 82 moves the document stack in synchronization with the rotation of the calling roller. The document bundle is sent by pushing out the rear part, and only the lowest document is separated by the endless belt 7 and separation roller 8 and sent to the pull-out roller 9. The leading edge of the document is the registration sensor 11
When this is detected, the driving of the separation roller 8 is stopped by the clutch, the document is conveyed to the contact glass 101 only by the pull-out roller 9, and the document is conveyed over the contact glass 101 by the conveyance belt 12. call koro 3
a and 3b, the drive is cut off when the photoelectric sensor 62 shown in FIG. 2 detects the slit 61 of the slit plate 60.
It stops when the omitted circular surface is aligned with the surface of the paper feed table 1.

After the registration sensor 11 detects the trailing edge of the document.

At a predetermined timing (based on pulse counting by an encoder), the conveyor belt 12 stops and the document is positioned in the case of non-abutment positioning, and the conveyor belt 12 reverses in the case of abutment positioning, and the document is placed on the scale 68. After hitting it, it stops.

Even in the case of non-abutment positioning, abutment positioning is performed every number of times determined by the number of times of circulating sheet feeding, for example every 10th time. As a result, the skew of the original is corrected and the original is stopped at a predetermined exposure position. In this state, original exposure scanning is performed. In response to the exposure scan end signal from the copying machine main body, the conveyor belt 12 rotates forward again, the document is sent to the reversing section 72 and makes a U-turn, and the single-sided or double-sided document, which has been exposed on both sides, enters the document ejection section 73. , an intermediate belt 27 and a guide plate 21 that can be retracted with the paper feed table 1 according to the document size;
22 and 23, is scooped up by the lower guide 29 of the paper ejection unit 18, and ejected onto the document stack on the paper feed table 1 by the paper ejection rollers 19'' and 19'. Ru.

At a predetermined timing after the paper ejection sensor 42 of the paper ejection unit 18 detects the leading edge of the document, the stopper 5 comes into contact with the top of the document bundle as shown in FIG. 3(b), and the document is ejected from the paper ejection unit 18. When the leading edge of the original documents hits the stopper 5, the skew is corrected and the documents are stacked.

As shown in FIG. 3(a), if a rib 1a of an appropriate height is formed on the upper surface of the paper feed table 1 at a distance from the pawl provided at a distance from the stopper 5, the paper feed can be easily performed. The document placed on the table 1 is pushed by the stopper claw and waves so as to enter from the upper end of the rib, so that the document discharged from the paper discharge unit 18 is prevented from slipping under the stopper 5.

While the original on the contact glass 101 is being exposed and scanned, that is, before the end of exposure, the drive is transmitted to the paper feed unit via the clutch and the primary original is separated and fed. By shortening the replacement interval and transporting at high speed, the total copy processing time can be shortened.

The manuscript that has gone through the rounds is in good shape to some extent, but it is not perfect and may be in a state of undulations. Therefore, before the next paper feeding operation, the calling roller 3a is activated.

It is preferable to rotate the document 3b to apply vertical vibration to the document to arrange it. At this time, the stopper 5 is retracted to a position away from the document, and the calling rollers 3a, 3b are
At the same time, by generating a conveying force in the conveying direction by the pushing plate 82, the front end of the document bundle advances to the vicinity of the pressure contact portion between the separation roller 8 and the endless belt 7. As a result of the above, the document stack is reset so as not to interfere with paper refeeding, and the next paper feeding operation is started in response to the paper feeding signal.

Summer - End According to the present invention, no matter what positioning method is used during circulating document feeding, the document is positioned by butt once during a predetermined feeding determined according to the number of circulating documents, so that the document will not be skewed. Therefore, no matter how many copies are copied, it is possible to improve the restackability of the original and obtain good conveyance quality, and at the same time, the image quality (registration, skew) is also improved.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the overall configuration of an automatic document circulation feeding device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a part of the calling roller and its control mechanism, and FIG. 3(a) is a front view showing the document on the paper feed table and the stopper, and FIG.
) are side sectional views showing an enlarged view of the paper feeding section, Figures 4 and 5.
Figure 6 is a side sectional view showing the state of the guide plate and exterior cover when the paper ejection unit of the original ejection unit is in various positions, and Fig. 7 is a perspective view showing the overall configuration of the original ejection unit. , FIG. 8 to FIG. 11 are explanatory diagrams sequentially showing the overlapping state of the links provided on each guide plate when the document discharge section guide plate changes from the most contracted state to the most expanded state. Figure 12 is a sectional view showing the guide plate in an open state, Figures 13 and 14 are plan views showing the drive mechanism of the extrusion plate, Figure 15 is a side view showing the movement of the extrusion plate, and Figure 15 is a side view showing the movement of the extrusion plate.
6(a) and 6(b) are flowcharts showing the operation flow of document feeding and document ejection from the contact glass of the apparatus of the above embodiment, respectively. 1... Paper feed table (original plate) 3a, 3b... Call roller (paper feed member) 4... Presser plate 5... Stopper 8... Separation roller 9... Pull-out roller 12. ...Transport belt 15...Reversing roller 18...Paper discharge unit (discharge unit) 19', 19''...Paper discharge roller 21.22.23...Guide plate 24.25, 26...Exterior Cover 68...Scale (protruding member) 70...Paper feed section 71...Transport section 72...Reversing section 73...Document discharge section 85...Stopper sensor 101...Contact glass

Claims (1)

[Claims] (1) An original document stack for placing a document stack consisting of multiple originals, and its front edge.The lowest document from the document stack is placed on the document platform with its front edge aligned at a predetermined position. a paper feeding unit having a paper feeding member for pulling out the document, and means for separating and feeding the pulled out originals one by one; transporting the original fed from the paper feeding unit to a document exposure position;
a conveying section having a conveying means for discharging the original after exposure of the original; a document ejecting section for returning the original discharged from the conveying section through a reversing path so as to overlap with the stack of originals placed on the document placing table; In the automatic document circulation feeding device, the document fed from the paper feeding unit is placed on the document regardless of the document positioning method at the time of predetermined feeding determined according to the number of circulation feeding times. An automatic document circulation feeding device characterized in that the document is reversely fed on a placing table and positioned by abutting the document against a predetermined member.