JPS60102651A - Both-face copying machine - Google Patents

Abstract

PURPOSE:To continue surface copy processing by front and rear picture recording body sides by utilizing a transfer paper inverting intermediate tray even if a jam occurs in the post-stage side, by providing selectively the second intermediate tray on a transfer paper carrying path. CONSTITUTION:In a both-face copying mode, a pre-stage image forming means 18a generates a surface copy mode, a post-stage image forming means 18b generates a rear- side copy, and a both-face copy is completed. In case when a jam is generated in the post-stage image forming means 18b side, a rear-side copying operation by the post- stage image forming means 18b side is stopped by detection of a jam sensor, and jam processing for removing jam paper is required. However, a switching pawl 29 is switched, a transfer paper inverting intermediate tray 24 is selected, transfer paper 7a of a surface copy generated continuously by the pre-stage image forming means 18a is stored temporarily in the transfer paper inverting intermediate tray 24, and a machine becomes a holding state. In the post-stage image forming means 18b side, when the jam processing is ended, a rear-side copying operation of the post-stage image forming means 18b side is restarted by feeding again the transfer paper 7a from the transfer paper inverting intermediate tray 24, by which a both face copy is completed.

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 double-sided copying machines, but generally they use one photosensitive drum, as shown in Japanese Patent Publication No. 49:3 G2 (I 'I). The conveyance path of the transfer paper is formed in a loop including both prime 1-lays, etc. As a result, the probability of the transfer paper jamming is high, 1-2 troubles occur frequently, and the time required for double-sided copying is reduced. It's a long one.

In this regard, U.S. Patent No. 3,536,398 and
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 complicated improvements to the optical system.

Therefore, the present applicant used two photoreceptor trams, formed a surface image on each photoreceptor drum using an optical system, and transferred the surface image of one photoreceptor tram onto transfer paper. A front-side copy is created using a transfer paper reversing device, and this transfer paper is sent through a transfer paper transport path to the other photoreceptor drum side while being reversed by a transfer paper reversing device, where the back-side image is transferred and a back-side copy is created. A new double-sided copying machine has been proposed that completes double-sided copying by the linked operation of .

According to this, the transfer paper conveyance system is simplified and shortened, jams are reduced, and double-sided copying speed is reduced.

However, even in such a double-sided copying machine, jams do not occur at all, and countermeasures must be taken when jams occur.

Purpose The present invention was made in view of the above points, and it is an object of the present invention to further improve the double-sided copying machine proposed by the applicant and to obtain a double-sided copying machine that can efficiently handle jams even if they occur. Let be 1j target.

composition One embodiment of the present invention is shown on the first page.

First, two photoconductor trams 18°1b which will become image recording bodies
are juxtaposed in the front and rear rows. These photoreceptor drums
According to the electronic 'rfL'C process for a and lb, a; pffi charger 2a, 21+, and eraser 3a.

3b, contact glasses 4a, 4b, optical systems 5a, 5L+ that expose and image the J2 original, developing devices 6a, 6b, v
, paper feed section +(, 'I, 8b, separation transfer charger 9a, 9b, cleaning device 10a, 10
b, static eliminator 11a, llb, fixing device 12a, ], 2
b is provided. Here, contact glass 4a,
Automatic document transport bags [13a, 13b] are provided on 4b. This page 1'JJ I77 Document conveyance device 13a, 1
3b is the document 1 set on the document table 14a, 1.4b.
It mainly consists of conveyor belts 16a and 16b for conveying 5a and 15b, and also includes recycling paths 1.7a 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 trams la and lb to convey the transfer paper 7a from the 01j stage side to the rear stage side! 118 is formed in a straight line, and has a transfer paper reversing device 22 in the middle. This transfer paper reversing device 22
The transfer paper reversing conveyance device 23 is capable of reversing only one sheet of transfer paper 7a and immediately transporting it to the subsequent stage side, and the transfer paper located below it is capable of storing a plurality of sheets of transfer paper 7a and can then be reversely fed. and an inverted intermediate tray 24. As is well known, the transfer sheet reversing conveyance device 23 is composed of three roller pairs 25 and a reversing path 26, and as shown in the figure, the two upper rollers of the three roller pairs 25 are connected to the reversing path 26.
If 5 is opened, the transfer paper 7a enters the reversing path 26 and is reversed and conveyed, but if the 5 reversing path 26 is closed, the transfer paper 7a
is simply passed through without being reversed.

The transfer paper reversal intermediate 1-lay 24 is provided with a J linori pressure plate 27 and a paper feed roller 28.

Transfer paper reversal conveyance device 23 side and transfer paper reversal intermediate tray 24
A switching claw 29 is provided to selectively switch the side by 1JJ. Furthermore, a second medium 1111 that can store the reversed transfer paper '1a' is provided at the downstream stage of the transfer paper reversal + ffJ feeding device 23.
The L-ray 30 and the paper feed roller 31 move along the transfer paper conveyance path 2.
A switching claw 32 is provided in parallel to 0 and selectively switches between the two. Meanwhile, document transport &!
821 is also the automatic document feeder 13a.

13b to convey the original 15a from the +)ii stage side to the rear stage side, and is formed in a substantially straight line, and a document reversing device 35 is provided in the middle thereof.

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 recycle path 17a side is provided at the rear stage of the automatic document feeder 1.3a. A switching claw 40 is provided for selectively switching between the paper 1-lay 39 side and the recycling path 17a side.

Next, a reversing device 53 having a paper folding stopper 52 as well as three roller pairs 50 and a reversing path 51 is provided at the rear stage of the fixing and feeding station 12b on the side of the photosensitive drum lb, and at the rear stage there is provided a reversing device 53 having a paper folding stopper 52, and a switching claw 54 at the rear stage. A B1-1b lay 55 and a sorter 56 are provided. Also, at the rear of the automatic document feeder 13b, three roller pairs 57 and a reversing path 58 are provided.
A paper ejection tray 60 is provided via a reversing and ejection device 59 having a reversing and ejecting device 59. Reference numeral 61 denotes a switching claw for selectively switching between the reverse discharge feed fa59 side and the recycle path 17b side.

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

In such a groove bottom, the double-sided copying machine of this embodiment can deal with various aspects. Here, switches, control circuits, etc. are listed in 1. Various modes (not shown in +1) can be set freely.

First, obtain one double-sided copy from one double-sided original 1-1
Consider the case of double-sided copy mode. At this time, manuscript +5a @
-Set on document table L4al. When copying is started, this original 15a is fed and transferred to the conveyor belt l-I.
Ga sends it to contact 1 to crow/IaJ, : and stops. Therefore, the optical system 5a is connected to the contact glass 4a.
The surface of the upper original 15a is exposed and scanned to form a latent image on the rotating photosensitive drum la. this/! After the image is developed by the developing device 6a, it is transferred to a transfer sheet 7fl fed at a predetermined timing from the sheet feeding section 8a side by the action of the pre-transfer charger 9a. Then, the image passes through the fixing device 12a and the surface copying onto the transfer paper 7.1 is completed. When the front copy is completed in this way, the original (1', +115a) on the contact glass 4a is conveyed to the document reversing device 35 side by the conveyor belt 16a.

The document is reversed by the document reversing device 35 and directed to the automatic document feeder 13a side with the back side facing down.
It is set on the contact glass 4bJ2 by b. At the same time, the next document 15a is transferred to the automatic document feeder 13a.
is placed on the contact 1 on the glass 4a. On the other hand, the transfer paper 7a on which one side has been copied is sent from the fixing unit 9 12a to the transfer paper reversing conveyance device 23, where it is reversed so that the uncopied back side faces up, passes through the transfer paper conveyance path 20, and is transferred to the photoreceptor drum ib. On the other hand, it is in a standby state. Therefore, backside copying is performed on the photosensitive drum lb side (at this time, frontside copying of the next document is performed on the photosensitive drum 1-ram la side). That is, the surface side of the original 15am printed on the contactor 1-glass 4b is exposed and scanned by the optical system 5b, and a latent image is formed on the photoreceptor 1-ram lbl, and the surface copy is transferred according to the development, transfer, and fixing processes. paper 7
A back side copy will be formed on the back side of a. Then, the original 15a and the transfer paper 7a on which both sides have been copied are discharged 1-
The paper is transferred to tJj paper such as Reiro 0.55 (inverted or selected by the sorter 56 if necessary).

Next, let us consider the repeat 1-double-sided copy mode in which a predetermined number of double-sided copies are made from one double-sided original in the double-sided original-double-sided 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 tray 24 is selected instead of the transfer paper reversing conveyance device 23. First, the automatic document feeder 13a feeds the document 15, 1 onto the contactor 1 to the glass 4a, and for each document 1, the photosensitive drum Ja side repeats copying and tiling the number of copies of 1 copy, and makes a front copy. Create J mark. Transfer Jdt7a whose surface has been copied is sequentially reversed from transfer paper intermediate 1 to r2.
IJI on 1. It will be papered and temporarily stored. Then, when the front side copying for the number of repeat sheets is completed, the original f on the contacts 1 to 4d is printed.
z: 'X'U II'''j :l !While being conveyed and set on the contact glass 4b, the contact 1 was
~Glass/Irri send set 1 to I b J-. On the other hand, in the transfer paper reversing intermediate 1-ray 1'24 or in the conveyance path immediately before it, there is a stage 1111 (paper sheet number 1 detection r stage), which can store transfer paper 7.1 for the number of sheets of repeater 1. When the image is detected, the partition pressure plate 27 moves 2.Nia stone (Roller: 18
The paper is switched to the r'8 paper standby state on the photosensitive tram 11) side. However, regarding the document 15a that was transferred to the camera 1 on the contact 1~glass llb! 88 tram 1b
Back side copying will be performed on the side, and the transfer paper 7a on which the chiseled side has been copied is fed one by one in reverse order by the paper feed roller 28, completing the double-sided copying. .

Also, in the double-sided copy mode, let's consider a case where an 11-sided original or one double-sided copy is to be made. In this case as well, there are I- (duplex copy mode and Libby 1-duplex copy mode I-), but in the front sound field 0-, 41 mm'q paper roll 1 (] 4 admixture device 23 is selected). However, in the case of rear 11, transfer is selected from 3 inversion intermediate 1-ray 24.On the other hand, for the original side, two methods can be adopted. Place a photosensitive f(15.1) on the surface of the odd-numbered (for the surface) surface (15.1); 11 original document I5a is transferred immediately through Muro 21-Contact 10,000 Rano, 4b.
JI' Paper 1, Jj, Original [1゛) Table 1, 1a Next even quantity (m commercial) original 15 +1 Contact glass 41 after passing through the document conveyance path 21] ''Secondly, there is a method in which the back side is copied using the conveyance cell IL. t), document reversing device 35
becomes inactive. Also, from the beginning, divide the original TA into one for the front side and one for the back side; for the front side; "J', J4I ftr
i I 5a as the document table 141)-1-Pitch,) W commercial as the document 15b' claw (high platform 14 b l
Set it to 7, Famous own iFJ + original transport'! Place 1
, "r a , l ', 1 b !'i shi11] W
You can have J+ make it. At this time, send the manuscript 1fffl.
! 121 is closed, 1;su, J゛, the original L' that collapsed into a surface copy, 1i15d is Ijl° paper 1-ray 39 11
1 sheet is printed, 4 sheets are printed, and in the double-sided copy mode as described above, the front-stage image forming means 18a creates the front-side copy mode 1~, and the 1-stage image forming means +8b creates the back-side copy mode. This is to make a copy and complete a double-sided copy. in this case,
Transfer paper 7 a is approximately straight R house-shaped and short) Transfer paper transport y: +
Since the photosensitive drum 1a is transported from the photosensitive drum 1a side to the photosensitive drum lb side in 20 seconds, the probability of occurrence of transfer paper jam t1 is reduced, and the production of a series of copies is also facilitated. This is the original ζδ side'CbF-1i 1. With Ti 7Q, there is no need to move between the automatic document transport and transport stations 13a and 13b.
Since the high IIQ feed path 21 is substantially straight and short, the document
decreases by 1-ru. Also, since the transfer paper 7a is reversed by the surface copy 1 te 2, the transfer paper ash is inverted by the - holder 23, and the 1·y light ((ri 1 spatula A l +) side l·vertical 1 is sent, the photoreceptor For Dora Ala□\, it is equivalent to A'r: Drum 1a, I
You can do both the I+Q way and the 2nd way.

Follow-] and conventional! 111 <, If 4! to the optical system, such as adjusting the orientation of the image, etc. If there is no need to work as a worker,
q′l-can be purified. In addition, as a result, the manuscript can also be written in a straight line, and a flow J type can be adopted from the +'+i4 stage side to the rear stage side.
By using the automatic document feeders 13a and 13L+, a large amount of double-sided copying can be performed automatically and in a short period of time if+f.

Therefore, in this 7'□1 double-sided copying process 11),
GX”!-y;J” on the rear image forming means +8b side
Consider the case where this occurs. At this time, the rear side imitation form IA f
Step 181) is filled with J31, and sensor Suzu 41 shows this f, ζ step.
Processing Q and equipment will be required.

However, for some reason, the front image forming stage L8a does not stop its copying operation, and the front side copying operation f1 continues to the top. For this reason, assuming that transfer A11 (reversing conveyance device 23) is selected as the transfer paper reversing device 22 and a double-sided copying operation is being performed, Transfer paper reversal intermediate 1-G (2 nol is selected, 1) "transfer paper 7 a + J of the front side copy that is continuously created by the stage both blood forming plate, 1 role 18a. Temporarily stored in 24,), 1[, l:
, there will be one aircraft.

At this time, transfer at reversal intermediate 1-ray 1゛24'' CL1 transfer paper 7a 1 sheet fσ and apply pressure Saka 27 Ganryoku l ＼ Overthrow 1, : I! / J copy, grind 7.1 order to go crazy (,1
7, second stage image formation-f 1st stage 181) side C
Haji\+4 processing is 8. '! After 'f', re-feed the transfer paper from intermediate 1, 1, 42, 1 to Φ and copy JJ's 7a, and resume the backside copying operation on the rear image formation r r', 't + + l+ side U゛By doing this, a double-sided copy is completed. In other words, even if the second-stage image forming means + 8h "C jam" occurs in the method of this embodiment in one-sided copying, the first-stage image forming means 18a does not stop and continues the copying operation, so that the jam can be cleared. During this time, front copy will be performed, and after clearing the jam, the transfer paper will be reversed and
The transfer paper 7a3 is fed from the transfer paper 7a3 from the transfer paper 7a3, which is the same as the single-sided copying operation of a normal copying machine, and even if a jam occurs, it is efficient. Regarding the operation after such a jam clearing, the previous stage image 91
In some cases, the forming means 18a side does not finish all surface copying. In such a case, it is not possible to continue front side copying and send the transfer paper 7a to the subsequent stage side through the transfer paper reversal conveyance device 23, or to store the transfer paper 7a in the transfer paper reversal intermediate I-ray 24 (the back side of the partition pressure plate 27 ). However, according to this embodiment, the problem can be solved by using the second intermediate one-way rail 30. That is, when the jam has been cleared and the reverse side copy is being performed based on refeeding of the transfer paper from the transfer paper reversing intermediate tray 24, the front image forming stage 18a
The front surface copying is continued, and the transfer paper 7a on which the front surface copy has been copied is reversed by the transfer paper reversing conveyance device 23, and then temporarily stored in the second intermediate 1-ray 30 via the switching claw 32t. be. Such an operation is temporarily performed until the refeeding of the transfer paper 7a from the transfer paper reversal intermediate 1-lay 24 is completed. When the eM photo paper is reversed in this manner and the re-feeding from f24 is completed, the paper feed roller 3I operates to transfer the transfer paper 7a whose front side has been copied and stored in the second intermediate 1 to ray 30. is provided for back side copying. If there is a front side copy to be made at the front image forming means 1.8a, the transfer paper is reversed at the intermediate stage 1.l/r.
It is stored in 24.

Thus, due to the presence of the second intermediate 1-Le (3(l),
Back side copy after jam removal 11 Yiko, I) 6 rows 0111
Therefore, surface copying can be carried out continuously, and from this point of view as well, the efficiency of post-processing when a jam occurs can be reduced by 1'.

By alternately selecting and using the second intermediate 1-lay 30 (including the operation of the transfer paper sheet 11 and conveying device 23) and the transfer paper reversing intermediate tray 24, it is possible to perform front side copying and back side copying even in the repeat duplex copy mode. Can be created in parallel.

By the way, regarding the processing of the originals at this time, if you set all the originals on the automatic document feeder 13a side and perform double-sided copying, all the originals after the jam and before the jam removal are placed in the output tray 39. 1l111°, and when the subsequent image forming means 18b side resumes operation, only the original required for reverse side copying is manually fed from the reversing unit 37, or the document platen 14. b, and place it on the automatic document feeder 13b.
may be made to operate. Further, the document 15a is a single-sided document, and is divided into a front side document and a back side document 15a. 15b is set on the document trays 14a and 14b, the automatic document feeder 13b is stopped after a jam is detected, but the automatic document feeder 13a is allowed to continue operating.

You can also select one-sided copy mode.

Various single-sided copy processes are possible. First, the double-sided copying machine of this embodiment can perform double-sided copying by linking the front and rear image forming means 1'8a and 18b.
Each of the elements 18b can be driven independently. That is, q1
Since there are two copying machines, originals 15a and 15b are set in automatic document transport bags 13a and 13b, respectively, and transfer paper 7a+7b is fed from each paper feed section 8a and 8b. Photosensitive drums la, lb, optical system 5
A, 5b, etc. can perform one-sided copying simultaneously in parallel. Therefore, when copying a large amount, if Jb is divided into one copy, the time will be halved, resulting in high-speed processing. In this case, the original 15a is ejected to the ejection tray 39,
171 sheets of transfer paper 7a are placed on the transfer paper reversing intermediate tray 24. In this case, the front and rear image forming means 18a, 18
Even if a jam occurs in either of the image forming means 18a and 18b, the operations of the two stages of image forming means 18a and 18b are not linked and copy processing is not performed on the same transfer paper 78. Only the image forming means 18b is stopped, and the other image forming means 18b or 18a is not affected.

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 18b
In parallel with the single-sided copying performed by the image forming means 18a, front-side copying processing can be performed by the front-stage image forming means 18a. The transfer paper 7a on which the front side has been copied is temporarily stored in the transfer paper reversing intermediate 1 on the lay 24. After the one-sided copying by the subsequent image forming means 18b is completed, the second-side image forming means +8b may perform back-side copying. 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. .

Even in such an operation, if a jam occurs in the rear image forming means 181) which is performing single-sided copying, the latter image forming means +8b is stopped, but the operation of the front image forming means 18a is continued to copy the front side. can be created. Such processing is also effective for interrupt copying during double-sided copying. That is, during interrupt copying (single-sided copying), subsequent image forming means], 8
This process is performed using b. 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 1/shelf 24. After canceling the interrupt copy, the back side copy of the transfer paper 7a in the transfer paper reversing intermediate 1 to the lay 24 is performed by the subsequent image forming means 18.
All you have to do is open IF.

Effects The present invention, as described above, connects the recording body with the transfer paper reversing conveyance device and the transfer paper conveyance path having the transfer paper reverse conveyance device and the transfer paper reverse conveyance device and the transfer paper reverse conveyance device and the transfer paper reverse conveyance device and the intermediate!−ray. , and because the second intermediate 1-lay was provided selectively to the transfer paper conveyance path,
Even if a jam occurs on the later stage side, the front side copying process can be continued on the previous stage image recording body side by using the transfer paper reversing intermediate tray, and furthermore, the transfer paper reversing intermediate 1-lay after the jam removal can be continued. By using the second intermediate 1-lay, it is possible to continue making front side copies even when the back side is being copied by feeding paper, which makes it possible to continue making front side copies when a jam occurs or after handling it. -It is something that can be used to achieve two goals.

[Brief explanation of the drawing]

The drawing is a schematic side view showing an embodiment of the present invention. 1a-1b...photosensitive drum (image recording body), 58-
5b...Optical system, 7a...Transfer paper, 20...Transfer paper transport path, 22...Transfer paper reversing device, 23...Transfer paper reversing transport device, 24...Transfer paper reversing intermediate I- Ray, 30
...Second intermediate tray applicant Rico Co., Ltd. −

Claims (1)

[Claims] A plurality of image recording bodies each having an optical system are provided, and a transfer paper reversing conveyance device that reversely conveys the transfer paper into a transfer paper conveyance path that connects these image recording bodies, and a plurality of transfer papers are temporarily stored in an inverted state. A transfer paper reversing intermediate tray for refeeding and transporting the transfer paper is selectively provided, and a second intermediate tray capable of storing the transfer paper reversed by the transfer paper reversing and transporting device and refeeding and transporting the transfer paper is provided as a transfer paper transport path. A double-sided copying machine characterized by being freely selectable.