JPS6097364A - Double-side copying machine - Google Patents

Abstract

PURPOSE:To simplify a conveying path and to enable decrease in jam and reduction in copying time by providing a device for upsetting transfer paper in a passage for conveying the transfer paper connecting plural image recording bodies. CONSTITUTION:A device 23 for upsetting transfer paper is constituted of a three- roller pair 25 and an upsetting path 26. If the two driven rollers on the upper side of the roller pair 25 open the path 26, transfer paper 7a enters an upsetting path 26 and is upset. If the upsetting path is closed, the paper 7a passes simply through said path. An upsetting conveyor 23 side and an upsetting intermediate tray 24 side are selectively changed over by a changeover pawl 29. The paper 7a is thus conveyed from a photosensitive body 1a side to a photosensitive body 1b side in a short and linear conveying path 20 for upsetting and therefore the generation of the jam of the transfer paper is decreased and the copying speed is improved.

Description

[Detailed description of the invention] Technical field The present invention relates to a double-sided copying machine.

PRIOR ART Conventionally, there are various types of machines for double-sided ty'ing, but generally speaking, as shown in 11111II photoreceptor drum 11, the The conveyance path of the transfer paper is formed in a loop, including the duplex tray, etc. As a result, there is a high probability that the transfer paper will jam, and troubles occur frequently, and the duplex copying It takes a long time.

In this regard, US Pat.
There is also a double-sided copying machine using two photosensitive drums, as shown in Japanese Patent No. 61559. However, even with this method, in order to match the image orientation between the front and back copies,
It is not sufficient, as it requires two complicated optical systems.

Purpose The present invention has been made in view of the above points, and an object of the present invention is to provide a new double-sided copying machine that can reduce jams and shorten one hour of copying by simplifying the transport path of transfer paper. shall be.

composition An embodiment of the present invention will be described based on the drawings.

First, two photoreceptor drums that become image recording bodies
.

lb are juxtaposed in the front and rear rows. Electrophotograph ↓'' (according to the process,
Charger 2a, 21), eraser; 3a.

3b, optical systems 5a, 5b that expose and image the original on the contact glasses 4a, 4b, QR image "yj[i'?6a, 6
b, paper feed sections 8a, 8b for transfer papers 7a, 7b, separation transfer chargers 9a, 9b, cleaning devices lOa, 10b
, static elimination bag [11a, Ilb, constant, r1 packaging @12a, 12
b is provided. Here, contact glass 4a,
An automatic document feeder [13a, 13b] is provided on 4b. These automatic document feeders 13a and 13b are operated by document 15a and 15b set on document table 14a and 1/Ib.
It mainly consists of conveyor belts 16a and 16b for conveying the water, and also includes recycling paths 17a and 17b.

In this way, the front-stage image forming means 18a and the rear-stage image forming means 18b are formed.

The front and rear image forming means 18a and 18b are connected by a transfer paper transport path 20 and an original transport path 21. First, the transfer paper conveyance path 20 connects the photoreceptor drums Ia and lb to convey the transfer paper 7a from the front side to the rear side, and is formed in a substantially straight line. have This transfer paper reversing device 22 includes a transfer paper reversing device W23 that can invert only one sheet of transfer paper 7a and immediately convey it to the subsequent stage side, and a transfer paper reversing device W23 located below it that can store a plurality of sheets of transfer paper 7a, and then inverting the transfer paper 7a. It is composed of a transfer paper reversing intermediate tray 24 that can feed paper. As is well known, the transfer sheet reversing conveyance device 23 is electrically powered by three roller pairs 25 and a reversing path 26, and as shown in the figure, two slave rollers on the two sides of the three roller pairs 25 are connected to the reversing path 26. If it is open, the transfer paper 7a enters the reversing path 26 and is reversed and conveyed, but if the reversing path 26 is closed, the transfer paper 7a simply passes through without being reversed.

The transfer paper reversing intermediate tray 24 is provided with a partition pressure plate 27 and a paper feed roller 28. and.

Transfer paper reversal conveyance device 23 side and transfer paper reversal intermediate 1-lay 2
Switching claws 29 for selectively switching between the four sides are numbered. Furthermore, a second intermediate tray 30 that can accommodate the reversed transfer paper 7a is provided downstream of the transfer paper reversal conveyance device 23, and is provided in parallel with the transfer paper conveyance path 20 together with a paper feed roller 31, so that both A switching claw 32 for switching selection is provided. On the other hand, the document conveyance path 21 is also
I3a.

13b to transport the original 15a from the front side to the rear side, and is formed in a substantially straight line, and a document reversing device 35 is provided along the way.

This document reversing device 35 is composed of three roller pairs 36 and a reversing path 37, similar to the transfer sheet reversing conveyance and feeding station 23, and the reversing path 3
7 also serves as a manual manuscript feeder. Here, a switching claw 38 for selectively switching between the document transport path 21 side and the recycling path 17a side is provided at the rear stage of the automatic document feeder 13a.
Furthermore, a switching claw 40 is provided for selectively switching between the paper discharge tray 39 side provided for the automatic document feeder 13a and the recycling path 1.7a side.

Next, a reversing and discharging device 53 having a paper folding stopper 52 as well as a three-roller pair 50 and a reversing path 51 is provided at the rear stage of the fixing feed [12b] on the photosensitive drum lb side. A paper discharge tray 55 and a sorter 56 are provided. Also, automatic document feeder 1
A paper discharge tray 60 is provided downstream of the paper tray 3b via a reversing and discharging device 59 having a pair of three rollers 57 and a reversing path 58. 61 is the reversing discharge transfer station 59 side and recycling path 1
This is a switching claw that selectively switches between the 7b side and the 7b side.

Note that 70 is a manual paper feed section provided in parallel with the paper feed section 8a.

With such a configuration, the double-sided copying machine of this embodiment can handle various aspects. Although switches, control circuits, etc. are not particularly illustrated here, various modes can be set freely.

First, obtain one double-sided copy from one double-sided original 1-1
Double-sided copy mode 11. Consider +1'. At this time, the original 15a is placed on the original table 14a. However,
When copying is started, the original 15a is fed, conveyed onto the contact glass 4a by the conveyor belt 16a, and stopped. Therefore, the optical system 5a exposes and scans the surface of the document 15a on the contact glass 4a to form a latent image on the rotating photoreceptor drive i, I*, 1. After this latent image is developed by the viewing device Ga, it is transferred to the transfer paper 7a fed at a predetermined timing from the paper feed section 8a side by the action of the separation transfer charger 9a. Then, the image passes through the fixing device 12a and the surface copying onto the transfer paper 7a is completed. Once the surface copy is completed in this way.

The document 15a on the contact glass 4a is transported by the conveyor belt 16.
The document is conveyed to the document reversing device 35 side by the document reversing device 35, and is then reversed by the document reversing device 35 and placed with the back side facing down.
Heading toward the WI feeding device 13a side, its conveying belt 1.6
b, the contact 1 is set on the glass 4b. At the same time, the next document 15a is transferred to the automatic document feeder 13a.
is applied onto the contact glass 4a. on the other hand,
The transfer paper 7a on which the front surface has been copied is sent from the fixing device 12a to the transfer paper reversing conveyance device 23, where it is reversed so that the uncopied back side is ``2'', passes through the transfer paper conveyance path 20, and is transferred to the photoreceptor drive 81b. On the other hand, it is in a standby state. Therefore, backside copying is performed on the photosensitive drum 1b side (at this time, frontside copying of the next document is performed on the photosensitive drum 1-ra side). That is, contact 1~glass/lb
The reverse side of the original 15a that has been printed on the photoreceptor drum 1 is exposed and scanned by the optical system 5b. b, l:
A latent image is formed on , and a back side copy is formed on the back side of the front side copied transfer paper 7a according to the development, transfer and fixing process. Then, the original 15a and the transfer paper 7a on which both sides have been copied are discharged to a paper discharge tray 60, 55, etc. (
(or the sorter 56 is selected as necessary)
.

Next, we will consider a repeat duplex copy mode in which a predetermined number of double-sided copies, set as repeat~i~, are made from one double-sided original, although this is also the double-sided original-duplex copy mode. Basically, it is the same as in the 1-1 double-sided copy mode described above, but the switching claw 29 is switched and the transfer paper reversing intermediate 1 lay 24 is selected instead of the transfer paper reversing conveyance device 23. First, the automatic document feeder 13a transfers the contact 1 to the glass 4.
For the original 15a that is fed to the second copy 15a, the scanning operation is repeated for the number of repeat sheets on the photosensitive drum 111a side, and a front side copy is created. The transfer paper 7a on which the front side has been copied is sequentially discharged to the transfer paper reversing intermediate 1-lay 24 and temporarily stored therein. Then, when the front side copying of the number of pages to the repeater 1 is completed, the original 1 is placed on the contact glass 4a''2.
5a is being reversed by the document reversing device 35 and the contact 1 is
-The glass 4bJ2 is conveyed to the cellar 1-. On the other hand, a paper discharge number detection means is provided in the transfer paper reversing intermediate tray 24 or in the conveyance path immediately before it, and when it is detected that the transfer paper 7a corresponding to the number of repeat sheets has been stored, the partition pressure plate 27 is activated to feed the paper. It switches to the roller 28 side and enters a standby state for paper feeding to the photosensitive drum lb side. As a result, the back side of the original 15a set on the contact glass 4b is copied on the photosensitive drum lb side, and the transfer paper 7a on which the front side has been copied is transferred from the intermediate tray 24 by the paper feed roller 28 in an inverted state. Paper is fed one by one, and duplex copying is completed.

Also, in the double-sided copy mode, consider the case where a double-sided copy is obtained from a single-sided original. In this case as well, there is a 1-1 double-sided copy mode and a repeat double-sided copy mode, but in the former case, the transfer paper reversing conveyance device 23 is selected, and in the latter case, the transfer paper reversing intermediate tray 24 is selected. . on the other hand,
On the manuscript side, two methods can be adopted. First, all originals are set on the original platen 14a of the automatic document feeder 13a, and after the front side copy is completed on the photosensitive drum la side for the odd-numbered (front side) original 15a, the odd-numbered original 15a on the contact glass 4a is The th original 15a is transferred to the original transport path 21.
- While immediately ejecting the paper through the contact glass 4b, the next even-numbered (back side) original 15 on the original platen 14a
There is a method in which the document a is passed through the contact glass 4a and the document conveyance path 21, and is then placed on the contact glass 4b to be used for back side copying. That is, the document reversing device 35 becomes inactive. Also, from the beginning, the original is divided into one for the front side and one for the back side, and the one for the front side is placed on the document table 1 as the original 15a.
4b, and the back side document 15b is placed on the document platen 14b, and each automatic document feeder 13a
, 13b may be operated separately. At this time, Jif
The Ioi conveyance path 21 is closed, and 114 sheets of originals 15a subjected to front side copying are placed on the paper discharge tray 39.

In any case, in the double-sided copy mode 1- as described above, the front-stage image forming means 18a creates the front-side copy mode, and the rear-stage image forming means tab creates the back-side copy to complete the double-sided copy. . In this case, transfer paper 7
Since the sheet a is conveyed from the photoreceptor drum Ala side to the photoreceptor drum Ib side by a substantially linear and short transfer paper conveyance path 20, the probability of occurrence of a transfer paper jam is reduced and the copying speed is also improved. This JL is the same on the document side, and since the document transport path 21 connecting the automatic document transport stations 13a and 13b is substantially straight and short, document jams are reduced. Furthermore, after the front surface copying of the transfer paper 7a is performed, the transfer paper 7a is reversed by the transfer paper reversing device 23 and conveyed to the photoreceptor drum 1b side, which is equivalent to the case where the paper is fed toward the photoreceptor drum 1a.
The arrangement of the copying process components such as photosensitive drums 1a, 1.a, 5b, etc. b Both can be made exactly the same.

Therefore, there is no need to make complicated improvements to the optical system, such as adjusting the orientation of the images, as in the past, and the system can be simplified. Furthermore, as a result, it is possible to adopt a method in which originals are simply passed from the front side to the rear side, and by using the automatic document feeders 13a and 13b, it is possible to automatically perform a large amount of double-sided copy processing in a short time. be.

Furthermore, a single-sided copy mode can also be selected, and various single-sided copy processes can be performed. First, the double-sided copying machine of this embodiment can perform double-sided copying by linking the front and rear image forming means 18a and 18b; It is powered by Uruchino. In other words, there are two independent copying machines, and each automatic document feeder 13a,
Place originals 15a and 15b on paper 13b and transfer paper 7a.
, 7b feed paper from the respective paper feed sections 8a, 8b, so that the respective photoconductors Ala, lb and the optical systems 5a, 5b are connected to each other.
etc., it is possible to simultaneously perform one-sided copying in parallel. Therefore, when copying a large amount of copies, if the copying is done by dividing the copying process, the time will be halved, resulting in high-speed processing. In this case, the original 15a is ejected to the paper ejection tray 39, and the transfer paper 7a
The paper is damaged in the transfer paper reversal intermediate 1-lay 24.

Next, one-sided copying that takes advantage of the feature that the front and rear image forming means 1.8a and 18b are linked will be explained. For example, you may want to make a single-sided copy of a double-sided original, but in this case, set the double-sided original on the document table 14a, and copy the front side of the original onto the transfer paper 7a using the photoreceptor driver lz l a side, as in the case of front-side copying. A copy is made, and this transfer paper 7a is discharged to the transfer paper reversing intermediate tray 24. After this operation is completed, the document 15atI on the contact glass 4a is reversed through the document reversing device 35, and conveyed and set on the contact glass 4b. Then, one-sided copying of the original 15a is performed on the transfer paper 7b on the side of the photosensitive drum lb. By repeating the same operation, double-sided original-single-sided copy processing can be performed automatically.

In addition, even when copying the same one-sided copy, there are cases where multiple copying is required in which multiple original contents are overlapped and copied on the same copying side. In this case, after performing the first one-sided copying on the transfer paper 7a, 7a is sent to the photosensitive drum 1b side in a non-inverted state through the transfer paper reversing conveyance device 23 in an inactive state, and a second single-sided copy is performed by overlapping the documents on the contactors 1 to glass 4b.

Furthermore, for example, two B5 size originals can be converted into one B4 size document.
In some cases, it may be desired to make a copy of one sheet of paper, but in this case, the first-stage image forming means 18a copies one document onto half of the B4 size transfer paper 7a, and the transfer paper 7a is transferred to the photoreceptor drum without reversing. It is sufficient to send it to the lb side and copy the second original onto the remaining half of the transfer paper 7a on the post-stage image forming means +8b side. This can also be applied to double-sided originals, allowing double-sided originals to be made into double-sided copies.

Next, the coexistence of double-sided copying and single-sided copying will be explained. First, when normal one-sided copying is required, the first-stage image forming means 18a is not used, and only the second-stage image forming means 18b is used to perform the one-sided copying. As a result, the front-stage image forming means 18a is not in use, and if double-sided copying is required, the rear-stage image forming means 18a
) in parallel with single-sided copying by the front-stage image forming means 18a
Surface copy processing can be performed by. The transfer paper 7a on which the front side has been copied is the transfer paper inverted intermediate 1-lay 24.
It will be temporarily stored in. and.

After the single-sided copying by the subsequent image forming means 18b is completed,
It is only necessary to perform backside copying using this rear-stage image forming means 18b. At this time, the transfer paper 7a is fed from the transfer paper reversing intermediate tray 24, and the feeding state is the same as in normal one-sided copying, and there is no need to wait for processing on the front-stage image forming means 18a side, so it can be done in a short time. - Such processing is also effective for interrupt copying during double-sided copying. That is, at the time of interruption copying (single-sided copying), the subsequent image forming means 18b is used to perform the processing. At this time, the interrupted original is manually fed from the reversing path 37. Then, the front side copying process by the front image forming means 18a is continued, and the transfer paper 7a is stored in the transfer paper reversing intermediate tray 24. After canceling the interruption copy, it is only necessary to restart backside copying of the transfer paper 7a in the transfer paper reversing intermediate tray 24 by the subsequent image forming means 18b.

This is the same when a jam occurs on the side of the rear image forming means 18b, and the latter image forming means 18b is stopped, but the front side copying by the front image forming means 18a continues and the transfer paper 7a is rotated between All that is required is to store the paper in the tray 24 and, after clearing the jam, resume backside copying by the subsequent image forming means 18b.

In this embodiment, the optical systems 5a and 5b are used for the photoreceptor drums Ala and lb, but one optical system scans the photoreceptor drum Ia when copying the front side, and scans the photoreceptor drum Ia when copying the back side. The imaging system can be moved to the photoreceptor drum lb side for scanning, or it can be placed in the center and the imaging system can be moved to the photoreceptor drum la, Ib side.
It is also possible to allocate them to each.

Effects In the present invention, as described above, a plurality of image recording bodies are interconnected by a transfer paper conveyance path including a transfer paper reversing device, so that the transfer paper conveyance path passing through the plurality of image recording bodies can be simply arranged in an axial straight line. It is possible to shorten the time, enable high-speed double-sided copying while reducing transfer paper jams, and simplify the optical system.

[Brief explanation of the drawing]

The drawing is a schematic side view showing an embodiment of the present invention. ■a~lb...photosensitive drum (image recording body), 58~
5b...Optical system, 7a...Transfer paper, 2o...Transfer paper conveyance path, 22...Transfer paper reversing device Applicant Rico Co., Ltd. -

Claims (1)

[Claims] 1. A double-sided copying machine, comprising a plurality of image recording bodies on which images are formed by an optical system, and a transfer paper reversing device provided in a transfer paper conveyance path connecting these image recording bodies.