JPH02132069A - Duplicating device - Google Patents

Abstract

PURPOSE:To prevent contamination of the back of a document and to enable taking out of the documents placed in a state that documents are arranged, in order of a page, even after a circulation feed by a method wherein a walking bar carrying and carrying-back system is applicable for the circulation type document conveyance unit of a duplicating device. CONSTITUTION:A plurality of documents D are placed on a document plating plate in a state that a picture surface is up, the documents are placed in order of a first page, second page,... from above and are detected by means of a placement sensor. When, with the button of a picture forming sensor unit 20 depressed, the whole of the document D is pushed on a rear end regulating plate 11 of an RDH unit (recycling type document feed unit) 10 and edges are trued, a gate 12 is lowered. When the whole of the document D is fed between a roller 16 and a belt 15 by means of a roller 14, the gate 12 is lowered. In which case, when the feed signal is outputted from the unit 20, the belt 15 effects one full rotation and the topmost layer document D is fed and moved forward by means of a roller 16, and moved over a platen glass 28 at a given speed. The document D is exposed in a moved state by an optical system 21 below the glass 28. The exposed document D is detected by a discharge sensor and conveyed by means of a belt 19, and is placed on a remaining document D on a placing plate.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is equipped with a circulation type document feeding unit using a top-feed and top-return conveyance method to feed a plurality of documents, and to transfer image-formed documents. The present invention relates to a copying apparatus that collects and binds sheets of paper.

[Conventional technology]

A copying device that copies a manuscript consisting of multiple sheets (for example, five manuscript pages from page 1 to page 5 of a book) to obtain at least one copy, and punches or binds the copy. requires a document conveying device that has a function of repeatedly feeding and copying a plurality of copies of a plurality of documents in sequence. A circulating document feeding unit (hereinafter referred to as RD) is a unit for this purpose.
H unit) is used.

This type of copying apparatus includes the RDH unit, an image forming unit that copies the image surface of a document to obtain a copy, and a transfer paper process that collects and binds transfer sheets discharged from the image forming unit in sections. It is composed of units.

Conventional RDH units use a bottom-feed and top-return conveyance method in which multiple documents are sequentially conveyed from the bottom layer to the document table (feed down) and then returned to the top onto the document stacked on the document placement plate. It has been adopted.

In this conventional RDH unit, when a document consisting of multiple sheets is set on the document placement plate, the trailing edge regulating plate moves the entire document consisting of multiple sheets between the output port-ra and the pressure roller. - The roller rotates to feed the document between the double-feed prevention roller and the separation belt. The double-feed prevention roller rotates together with the separation belt, and only the lowest document is fed. The fed document moves forward along the guide plate, is fed by the second delivery port, is taken over by the conveyor belt, and moves over the plantain glass at a predetermined speed.

The document moving on the plantain glass is positioned at a predetermined position by a stopper provided on the plantain glass.

In the image forming unit, an exposure optical system provided under the plantain glass exposes the image surface of the document,
An electrostatic latent image is formed by irradiating the photoreceptor drum with light reflected from the image surface of the document. The electrostatic latent image formed on the photosensitive drum is developed by a developing device to become a toner image. On the other hand, the toner image is transferred to the transfer paper fed from the paper feeding unit by a transfer device, and fixed by a fixing device. The transfer image transferred to the transfer paper is fixed by the fixing device and then ejected. Next, in the transfer paper processing unit, the copies are collected one by one on a stable, punch, etc., subjected to bookbinding processing, and then discharged.

[Problem that the invention seeks to solve]

By the way, in a circulating document feeding unit that uses the bottom-feed and top-back transport method, the separation belt rotates and the double-feed prevention roller rotates in the opposite direction to feed only one original from the bottom layer of multiple originals. send

Therefore, the lowest layer document is fed with its image surface in contact with the back surface of the upper layer document. Moreover, the document consisting of a plurality of sheets is pressed by a pressing roller.

Therefore, the back side of the document pressed by the pressure roller comes into strong contact with the image surface of the lowest layer document being conveyed, and the large area of the image surface comes into contact, causing the problem that the back surface of this upper layer document gets dirty. .

Therefore, if the top-feed and top-return transport method is adopted in the RDH unit, only one original from the top layer of a plurality of originals is transported. The document located in the upper layer moves, but the image surface of the document in the lower layer, which is pressed by the suppression roller, does not move. The image surface of the document located in the lower layer pressed by the pressure roller does not stain the back surface of the document located in the upper layer.

On the other hand, in the top-feed and top-return transport method, the stacking order of the originals stacked on the document placement plate is that they are fed from the top layer of a multi-page document and returned to the top layer of the document on the document placement plate. Therefore, each time the originals are fed, the order in which the originals are stacked on the original plate is reversed. Therefore, the copying order of the copies copied by the image forming unit is also reversed, resulting in a problem that the transfer paper processing unit becomes complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a copying apparatus that can collate, bind, and eject copies without staining the back side of the original.

[Means for solving problems]

The above purpose is to feed a plurality of originals to the original platen in sequence, starting from the top layer of originals stacked on the original stacking plate, and then place the originals on the original stacking surface on the original stacking plate. an image forming unit that reads the image of the document and forms the image on transfer paper; and a circulating document feeding unit that detects the number of times the document is circulated. When the number of times the document is circulated is an odd number by a signal, the transfer paper after image formation is conveyed to the first processing section, collated, bound, and discharged, and the number of times the document is circulated is an even number. This is achieved by a copying apparatus characterized in that it includes a transfer paper processing unit that transports the transfer paper after image formation to a second processing section, collates and binds the transfer paper, and then discharges the transfer paper.

〔Example〕

The present invention will be explained based on the drawings.

FIG. 1 shows an embodiment of the copying apparatus of the present invention, and is a cross-sectional view showing its configuration, and FIG. 2 shows details of the RDH unit 10 installed in the copying apparatus of the embodiment of FIG. FIG. .

In these figures, the copying apparatus is composed of an RDH unit IO, an image forming unit 20, a paper feeding unit 30, and a transfer paper processing unit 40, and the RDH unit 10 feeds originals one by one through a normal electrophotographic process. It is configured so that the transfer paper obtained by copying is punched, stapled, etc., and subjected to binding processing.

The RDH unit 10 of this embodiment has a configuration in which the separation bell I-15 is positioned above and the double-feed prevention roller 16 is positioned below. It is characterized in that it is fed from the top layer, and the document fed by the transport pel l-19 is placed on the top layer of the documents that remain on the original stack.

The RDH unit 10 is installed on the top surface of a blunt glass 28 provided on the top surface of the image forming unit 20. A plurality of originals D to be copied are stacked on top of the original #C stack in the order of page 1, page 2, etc. from the top with the image side facing upward. The document D is detected by an original stack sensor (not shown). Here, when the copy button provided on the operation panel of the image forming unit 20 is pressed, the rear end regulating plate 1l of the RDH unit 10 moves forward, and the entire document D is pushed forward (to the right in the figure) and passes through the gate. Manuscript D by l2
When the entire edges are aligned, the gate 12 is raised. and,
When the feed roller l4 rotates and feeds the entire document D between the double-feed prevention roller l6 and the separation belt l5, the gate l2 is lowered. Note that the gate 12 separates the document fed by the separation bell l-15 and the double-feed prevention roller l6 and the document already fed by the document feed prevention roller l6. Separate the text from the original.

Here, when the image forming unit 20 outputs a document feed signal at a predetermined timing, the separation belt l5 rotates once and the double-feed prevention roller l6 rotates to remove the uppermost deep document D.
Only one sheet is fed. The fed document D advances along the guide plate, is fed by the delivery port l7, is taken over by the conveyor belt l8, and moves over the plantain glass 28 at a predetermined speed.

An optical system 21 consisting of a lamp for illuminating the original, a reflecting mirror, etc. installed under the plantain glass 28
The object is exposed to light while moving. The exposed document D is detected by the circulation discharge sensor S and transferred to another conveyor belt 19.
, and is placed on the remaining original document D placed on the original document placement plate.

The final discharge of the document D is detected by a circulation discharge sensor S. This circulation discharge sensor S outputs a circulation feeding number signal indicating the number of circulation feeding times of the document D.

Feeding of the second document starts when the trailing edge of the first document is detected by a timing sensor (not shown).

In the same manner, when the exposure by the optical system of the image forming unit is completed for all originals, such as the third, fourth, etc., the number of originals is confirmed by the original edge detection sensor (not shown), and the number of originals is The feeding of one part of the document is completed.

If a plurality of copies (for example, 5 copies) of the same copy are to be made, the document is automatically fed again sequentially from the last page and exposure is performed sequentially up to page l. This document feeding operation is repeated for the required number of copies.

Next, since the general structure and functions of the image forming unit 20 are already known, they will be briefly explained with reference to FIG.

The following electrophotographic process is performed within the image forming unit 20 in synchronization with the above operations of the RDH unit 1-10.

When the original D on the blunt glass 28 of the image forming unit 20 is exposed to light by the optical system 21, the reflected light from the original D passes through the mirror lens and the mirror to the photosensitive drum 27.
projected onto the top. Since the surface of the photosensitive drum 27 is uniformly charged by the charger 22, an electrostatic latent image is formed when reflected light from the original D is projected onto the surface of the photosensitive drum 27. The electrostatic latent image is developed into a visible image by the developing device 23, and the original D
The image is transferred by the transfer device 24a onto the transfer paper P fed in synchronization with the automatic feeding operation. The transfer paper P on which the visible image has been transferred is separated from the photoreceptor by the separator 24b, conveyed by the conveyor belt 34, and fixed by the fixing device 25.

A cleaning device 26 removes toner remaining on the surface of the photoreceptor 27 after the transfer paper P is separated.

As shown in FIG. 1, the copy paper processing unit 40 according to the present embodiment ejects the paper from the image forming unit 20 depending on whether the circulation feeding number signal detected from the RDH unit 10 indicates an odd number or an even number. a switching unit 4l that switches the conveyance path for conveying the transfer paper; and a first processing unit 42.
, a second processing section 43 , and a discharging section 44 .

The switching unit 4l is composed of a guide plate, an upstream roller and a downstream roller consisting of upper and lower rollers, a movable branch body (7 trumpets) with an inverted triangular cross section that is swingable about a shaft, an electromagnetic solenoid, etc. ing.

A discharge path along the upper surface of the movable branch, an introduction path continuous to the guide plate along one side, and a reversal discharge path communicating with the guide plate and the downstream roller along the other side are provided.

The movable branch is a drive device such as an electromagnetic solenoid (not shown)
As a result of the operation, the right tip on the upstream roller side is displaced up and down in the vicinity of the pressure contact point of the roller, and the introduction path is opened and the paper ejection path is closed, or vice versa.

Furthermore, when the movable branch body opens the introduction path as described above, the lower tip of the movable branch body approaches the outer guide plate of the path leaving a small gap for the transfer paper to pass through, and the lower tip of the movable branch body approaches the inversion path discharge path. They are spaced apart from each other more than the guide plates on the outside of the paper path. Therefore, the transfer paper that has been fixed and is discharged with its front and back reversed passes through the lower tip of the movable branching body, passes through the guide plate, is switched back by the reverse rotation of the forward/reverse roller of the branch conveyance section, and is conveyed in the reverse direction to the reverse paper discharge path. This prevents the transfer paper from flowing back into the introduction path when it is transferred.

FIG. 4 is a configuration diagram showing a conveyance path by the first processing section 42.

The first processing section 42 includes a transport roller 2411a for introduction from the switching section 4l, a forward/reverse roller 41lb, and a forward/reverse gate 41.
2, conveyance rollers 4 13a, 4 13b, fixed stacker 415, stopper 416, and collation processing device 417
and discharge ports 418a and 418b.

The first processing unit 42 transports the recording paper that has been fixed and is to be reversed, with the image side facing down, to the stacker 415, and when a portion of the recording paper is stacked on the stacker 415, processing is performed i4.
17, the collation and bookbinding process is performed, and the discharge rollers 441a, 44
Transfer to lb.

FIG. 6 is a configuration diagram showing a transport route by the second processing section 43.

The second processing section 43 includes a conveying roller 421a. 42lb, 4
28a to 428d, stacker 425, stopper 426
and the collation processing unit 427. Ru. Conveyance roller 42
Reference numerals 1a and 42lb are reversing rollers that reverse the front and back sides of the copy so that the image surface of the copy faces downward.

The second processing unit 43 transports the fixed and discharged recording paper P to the stacker 425 with the image side facing upward, and when a portion of the recording paper P is stacked on the stacker 425, the collation processing unit 427 for collation and bookbinding, and then turn the front and back sides so that the image side is facing down, and exit the exit slots 441a and 44l.
Transport to b.

The stacker 425 is an inclined plate fixed at an inclined angle,
It consists of a pair of side plates that are slidably provided on the upper surface so that the mutual spacing can be adjusted, and a stopper 426 that is provided directly below the inclined plate so that it can move forward and backward.

The stacker 425 includes an inclined plate that is tilted and fixed, a pair of side plates that are slidably provided on the upper surface of the plate so that the mutual interval can be adjusted, and a stopper 426 that is provided directly below the inclined plate so that it can move back and forth. It consists of

The collation processing section 427 consists of one punch machine and two staplers (so-called staplers) placed on both sides of the punch machine, and the collation processing section 417 can be independently pulled out to the front of the unit. It looks like this. This is to facilitate the disposal of bunch waste produced as a result of punching by the punching machine, the loading or replenishment of staples in the binding machine, or the removal of jammed staples.

The collation processing unit 427 consists of one punch machine and two staplers (so-called staplers) placed on both sides of the punch machine. It can be pulled out.

This is to facilitate the disposal of punch residue resulting from punch processing by the punch machine, the loading or replenishment of staples in the binding machine, or the removal of jammed staples.

The paper discharge tray 442 is a paper discharge plate on which a copy that has been collated onto a portion of the transfer paper is placed.

The collation and binding process in the copying apparatus of this embodiment will be described.

First, the first part, that is, the case where the circulating feed transmission signals are odd numbers will be explained.

FIG. 3 is a schematic diagram showing the stacking state of the original document D on the original stacking slope of the RDH unit IO when the number of circulation feeding is an odd number. A plurality of documents D to be copied are stacked one on top of the other in the order of D1 page side, D2 page side, etc. from the top with the image side facing upward.

FIG. 4 is a schematic diagram showing the paper feeding path in the transfer paper processing unit 40 when the number of circulating feedings is an odd number.

Since the RDH unit IO transports the originals D in the order of DI, D2, . The transfer paper P is conveyed along the arrow via the switching section 4l.

The switching unit 4l is previously switched to the l-th processing unit 42 based on the circulation feeding number signal from the RDH unit 10. The transfer paper P is transported to a forward/reverse rotation roller 41lb by an introduction transport roller 411a. At this time, the forward/reverse gate 4l
2 is located at the position indicated by the dotted line. The transfer paper P is conveyed in the same direction by the forward/reverse rotation roller 41lb until its trailing edge is detected by the trailing edge detection sensor 414.

When the trailing edge detection sensor 414 detects the trailing edge of the transfer paper P,
The forward/reverse gate 4l2 is switched to the position shown by the solid line,
The forward/reverse rotation roller 41lb starts to reverse rotation. The transfer paper P passes through a forward/reverse gate 412 and is transferred to transport rollers 413a, 413.
b, and is transferred to the stacker 415 with the image surface facing down.
will be loaded on.

When a portion of the transfer paper P is conveyed to the stacker 415 and stacked with the image side facing down, the stopper 416 moves forward and fits into the collation processing section 417, and a portion of the transfer paper P is conveyed to the stacker 415 and stacked with the image side facing down.
It is possible to obtain a copy that has been punched or stapled from the image plane direction and collated.

Next, the stopper 416 moves backward, the stacker 415 falls off, and the processed copies are transferred to the conveyance roller 418a with the image side facing down. 418b, and is further conveyed by the discharge port 441a. Conveyed with 44lb paper to output tray 442
will be stored in.

Next, the second copy, that is, the case where the number of times of circulation feeding is an even number, will be explained.

FIG. 5 is a schematic diagram showing the stacking state of the originals D on the original plate of the RDH unit 30 when the number of times of circulation feeding is an even number. The RDH unit 10 is stacked on the original stacking slope in the order of page D5, page D4, . . . with the image side of the document D facing upward.

FIG. 6 is a schematic diagram showing the paper feeding path in the transfer paper processing unit 40, in which the switching unit 4l has already been switched to the second processing unit 43 in response to the circulating feeding number signal from the circulating original feeding unit 10. be.

Since the RDH unit 10 transports the originals D in the order of D5, D4, . The transfer paper P is conveyed along the arrow via the switching section 4l.

This transfer paper P is transferred to the transport roller 421a. 42lb, and stacked on the stacker 425 with the image side facing upward.

When a portion of the transfer paper P is stacked on the stacker 425, the stopper 426 moves forward and is stored in the collation processing section 427, and this portion of the transfer paper P is punched or stapled from the image surface direction. It is possible to obtain some copies that have been collated.

Next, the stopper 426 moves backward and falls off the stacker 426, and the collated copies are transferred to the transport roller 428a.
, 428b and reversed. Therefore, the collated and bound copies are conveyed with the image side facing down by conveyance rollers 428c to 428d, further conveyed by discharge port rollers 441a and 44lb, and stored in a paper discharge tray 441.

The copying apparatus of this embodiment is capable of copying by switching between the first processing section 42 and the second processing section 43 in the transfer paper processing unit 40 based on the circulation feeding frequency signal from the RDH unit I-10. It is possible to obtain a double-bound copy.

Specify t: When the number of copies is an odd number, after all processing has been completed, the document stacking state in the RDH unit 10 is as shown in FIG. 5, with the image side of the document D facing upward on the document placement plate. The pages are stacked one on top of the other in the order of page D5, page D4, and so on from the top.

Therefore, when the number of copies of the original D is an odd number, the RDH unit 10 feeds the entire original D once after the processing in the image forming unit 20 is completed, so that it is placed on the original plate as shown in FIG. The stacking order is arranged by stacking the originals D with the image side facing upward in the order of DI page, D2 page, etc. from the top.

In the embodiment described above, copies that have been collated and bound by the first processing section 42 and the second processing section 43 are stored in one paper ejection tray 442, but the first processing section 42 and the second processing section 43 Separate paper ejection trays may be provided for the second processing section 43 and the second processing section 43, respectively.

〔Effect of the invention〕

The copying apparatus according to the present invention employs a top-feed and top-return conveyance method in the circulation-type document conveyance unit, so that the back side of the document is not soiled, and the document fed through the circulation-type document conveyance unit can be transported even after being circulated. It is now possible to provide a copying device that can be loaded and taken out with correct page alignment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the copying apparatus according to the present invention, FIG. 2 is a sectional view of the RDH unit installed in the copying apparatus shown in FIG. The fourth factor and FIG. 6 are schematic diagrams showing the paper feeding path in the transfer paper processing unit provided in the copying apparatus of FIG. 1. lO... Circulating document feeding (RDH) unit}11...
・Rear end regulation plate l2...Gate l3...Press roller 14...Half-moon roller l5...Separation belt l6...Double feed prevention roller l7...Conveyance roller
18, 19...Transport belt 20...Image forming unit 2l...Optical system 22...Charger 2
3...Developing device 24a...Transfer device 24b
... Separator 25 ... Fixing device 26 ... Cleaning device 27 ... Photosensitive drum 28 ...
・Plantain glass 30...Paper feeding unit 31
~33...Paper feed cassette 40...Transfer paper processing unit 4l...Switching section 42...First processing section 4
3... Second processing section 44... Paper discharge section 41lb.
・Forward/reverse rotation gate~ra 412...Forward/reverse rotation gate 415
, 425... Stacker 416, 426... Stopper 417, 427... Collation processing device 411a, 413a, 413b, 418a. 418b=
- Conveyance rollers 421a, 42lb, 428a ~ 428
d River conveyance rollers 441a, 44lb-discharge port-ra 442...paper discharge tray

Claims (1)

[Claims] A multi-page original is set on the document placement plate, and the document stacked on the top layer of the multi-page original is sequentially fed to the document table, and then the top layer of the document is placed on top of the document surface on the document placement plate. a circulating document feeding unit that returns the document; an image forming unit that reads the image of the document and forms the image on transfer paper;
The transfer paper after image formation is conveyed to the first processing section when the number of times the document is circulated is an odd number based on the number of circulation times of the document detected by the circulation type document feeding unit. After the document is collated and bound, it is ejected, and when the number of times the document is circulated and fed is an even number, the transfer paper after image formation is transferred to the second sheet.
1. A copying apparatus comprising: a transfer paper processing unit that transports the paper to a processing section, collates and binds the paper, and discharges the paper.