JPH04246663A - Composite copy preparing method for copying machine - Google Patents

Abstract

PURPOSE:To perform composite-copying from a lot of document groups at a high speed. CONSTITUTION:In the case of composite copying of images on two pages among the document groups successively fed by an automatic document feeder (RDH) on one page of a transfer paper, the image on every other page (odd numbered page) among the document groups is copied on only the 1st area of the transfer paper with keeping a 1st process until the document comes back to where it started, and thereafter, the process is switched to a 2nd process, and each document among the document groups coming back to where started is successively fed by the RDH again, and then, the document image on each page(even numbered page) which is not copied at the stage of the 1st process is successively copied on the 2nd area of each transfer paper having the 1st area where the image has been already copied. Thus, it is enough to switch the process mode once, so that a composite copying speed can be increased.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is applicable to an electrophotographic copying machine, for example, for making a composite copy of two A4-sized single-sided originals onto one A3-sized sheet of transfer paper, or for copying one-sided A4-sized originals at the same size. The present invention relates to a composite copying method for copying two pages of original images onto different areas of one sheet of transfer paper, such as reducing the size and copying the images onto a sheet of transfer paper.

0002

2. Description of the Related Art Conventionally, as a copying machine capable of making such a composite copy, there is a document feeding device that automatically circulates and feeds stacked documents, as shown in Japanese Patent Application Laid-Open No. 63-15273, for example. (hereinafter abbreviated as "RDH"), an optical device that projects (exposes) the image of the fed document onto the photoreceptor, and an electrostatic latent image formed on the photoreceptor by the projection. A developing device that visualizes the image, a normal paper feeding device that feeds new transfer paper, a refeeding device that stocks and refeeds the transfer paper on which the copy image has been transferred, and the developing device that makes the image visible. A transfer device that transfers the image formed on the photoreceptor onto a transfer paper fed from the paper feed device or the paper refeed device; In the first process of copying to the first half area in the paper feeding direction of the transfer paper and the second process of copying to the second half area, the relationship between the image forming area on the photoreceptor and the transfer paper on which the image is transferred by the transfer device is determined. There is a copying machine equipped with a means (timing control means) for shifting the relative position.

[0003] As a means for shifting the above-mentioned relative positions, there may be used methods such as changing the stop positions corresponding to the photoreceptors of each document, or changing the projection (exposure) start position of each document by an optical device. Then, the image of the first page (the first page in the case of a single-sided document, the front side of the first page in the case of a double-sided document) of the document sequentially fed by the RDH is printed on the transfer paper P as shown in FIG. The first process of copying to the first area S1 in the first half in the paper feeding direction and sending the transfer paper to the re-feeding device, and the second page of the original (the second page in the case of a single-sided original, the second page in the case of a double-sided original) A composite copy is created by alternately executing a second process of copying the image on the back side of the first sheet to a second area S2 in the latter half of the transfer paper P in the paper feeding direction and ejecting the copy.

As a result, for example, as shown in (a) of FIG. 8, two A4-sized single-sided originals can be compositely copied onto one A3-sized sheet of transfer paper at the same size, or as shown in (b) of FIG. It is possible to reduce the size of two single-sided originals onto one sheet of A4 size transfer paper and make a composite copy.

[0005]

[Problems to be Solved by the Invention] However, such a composite copying method in a conventional copying machine creates an image by sequentially projecting images of each page of a document sequentially fed by an RDH onto a photoreceptor. Then, it is developed and transferred alternately to the first and second half of the transfer paper to create a composite copy, so after the copy cycle for the first half of the transfer paper is completed, the copy cycle for the second half begins. Become.

[0006] Therefore, when trying to create a composite copy from a group of many originals, the first process for the first sheet of transfer paper →
The first process and the second process are executed alternately many times, such as 2nd process → 1st process for the second sheet of transfer paper → 2nd process → etc., and the process mode is changed every copy cycle. It is necessary to perform switching (shifting the relative position of the image forming area on the photoreceptor and the transfer paper, switching paper feed/ejection, etc.).

However, in general, it takes longer to switch the process mode than the net copying time (for example, if the first half is copied and the transfer paper enters the refeeding device and the paper is ready for refeeding) Therefore, there was a problem in that it took a long time to complete the composite copying of a group of documents for one job. The present invention has been made to solve these problems, and an object of the present invention is to enable high-speed composite copying from a group of multiple original documents.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a copying machine capable of making composite copies as described above, in which the following first process (1) and second process (
A synthetic copy method characterized by sequentially executing step 2) is provided.

(1) The control timing by the timing control means is set so that the copy image of the original is transferred to the first area of the first process transfer paper, and the original is sequentially fed by the original feeding device (RDH). The image is projected onto the photoreceptor every other page by an optical device, and the electrostatic latent image formed on the photoreceptor by the projection is visualized by the developing device, and a new transfer paper is fed from the paper feeder. After the transfer device transfers the visualized image onto the first area of the transfer paper, the transfer paper is sent to the paper refeeding device.

(2) A second area of the second process transfer paper whose position in the paper feeding direction is different from that of the first area.
The control timing by the timing control means is set so that the copy image of the original is transferred to the area, and the original feeding device (RDH) sequentially re-feeds each original of the original group that has passed through the feeding in the first process. The original image of the page that was not projected in the first process is projected onto the photoreceptor by an optical device, and the electrostatic latent image formed on the photoreceptor by the projection is visualized by a developing device, The transfer paper on which the copy image has been transferred to the first area is fed from the paper refeeding device, and the visualized image is transferred to the second area of the transfer paper by the transfer device.

[0011]

[Operation] In the composite copy making method according to the present invention, even when creating a composite copy from a group of multiple manuscripts, the RDH
Until each document is fed one after another by
Execute the copy cycle with the first process unchanged, copy the image of every other page of the document group only to the first area of each transfer sheet, then switch the process mode to the second process, and repeat the cycle by RDH. Each original in the original group is sequentially re-fed, and the original image of each page that was not copied in the first process is sequentially copied to the second area of each transfer sheet whose image was copied to the first area, so the process mode Switching only needs to be done once.

Therefore, the copying speed is approximately 1/2 that of normal continuous copying (approximately equivalent to normal copying in page units), and is about 5 times faster than that of the conventional example described above. Therefore, it is most suitable for copying for bookbinding, and by performing reduction composite copying, it is possible to save paper resources and improve copying productivity.

[0013]

[Embodiments] [Embodiments] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. FIG. 2 is an overall configuration diagram showing an example of a copying machine for carrying out the composite copy making method according to the present invention.

This copying machine can stack and set a large number of originals on the original table 40, and after conveying the originals one by one from the bottom to the projection unit, the originals are placed on the original tray 40 again. A circulation type automatic document feeder (RDH: the details will be described later) 1 that discharges and circulates transfer sheets Pa and Pb of different sizes from paper feed cassettes 3A and 3B arranged in multiple stages. feed the paper,
It consists of a copying machine main body 2 that transfers images to it to make copies.

Then, the document D set on the document table 40 of the RDH 1 is separated one by one from the bottom sheet and conveyed in the direction of arrow A, and the A3 size document in the copying machine main body 2 is moved in the horizontal direction. It is sent to a predetermined position on the contact glass 4 of a size that can be placed on it and stopped.

Next, the image of the document is irradiated by the exposure lamp 5 moving in the direction of the arrow of the optical device 10, and the reflected light is reflected by the first mirror 6, the second mirror 7, and the third mirror 8.
, the photosensitive drum 13 via the lens 9 and the fourth mirror 11.
is projected (exposed) to.

The photosensitive drum 13 is connected to a charger 14.
, and forms an electrostatic latent image thereon according to the image of the document projected by the optical device 10,
A developing unit 15 attaches toner to it and develops it.

On the other hand, by turning on a paper feed clutch (not shown), a paper feed cassette 3A, 3B, which is selected according to the document size, is selected from among the paper feed cassettes 3A and 3B, each of which stores transfer sheets of different sizes. rotates to feed the transfer paper one by one, and the paper is fed by the paper feed roller 20 and separation roller 21 so as not to send two sheets, and when it is transported by the pair of transport rollers 22 and reaches the photosensitive drum 13, The toner image is transferred by the transfer charger 16,
Thereafter, it is separated from the photoreceptor drum 13 by a separation charger 17 and transferred to a fixing unit 24 by a conveyor belt 23.
The transferred toner image is fixed as it passes there.

After the toner image has been transferred, residual toner is removed from the surface of the photosensitive drum 13 by a cleaning unit 18 in preparation for the next image formation. The transfer paper that has passed through the fixing unit 18 is transferred based on the instructions given in advance for "normal paper ejection,""reverse paper ejection,""paper refeed unit transport," and "reverse paper refeed unit transport." The paper is guided by a switching unit 25 (details of which will be described later) that switches the direction of each conveyance path, and is sent out to the designated conveyance path.

[0020] Also, the contact glass 4 after exposure is
The upper document is conveyed again by the RDH and discharged onto the document table 40 as shown by arrow B.

Reference numeral 26 denotes a refeeding unit, which stocks the transfer paper Pc on which a copy image has been transferred on one side, which is conveyed via the switching unit 25, on a refeeding tray 26a, and transfers the lowest transfer paper to a vacuum unit. 27, the other transfer paper is attracted to the conveyor belt 28, and at least the paper feed section side of the other transfer paper is floated by air blown out from an air blower (not shown).

When the paper refeeding clutch (not shown) is turned on, the lowest sheet of the stocked transfer paper Pc is sent to the left in the figure by the conveyor belt 28, and then transferred to the paper feed roller 29. The paper is reliably separated and fed by the reversing rollers 30, conveyed by the pair of conveyance rollers 22, and fed again to the transfer site of the photosensitive drum 13. In addition,
38 is a copy output tray, and 39 is a document output tray.

As shown in FIG. 3, the switching unit 25 consists of a main reversing roller 31, front and rear reversing rollers 32A, 32B, a branch claw 33, a reversing guide 34, a lateral paper ejection guide 35, and a lower paper ejection guide 36. Then, reverse rollers 32A, 32B
By moving the branch claw 33, the paper discharge mode of the transfer paper sent from the fixing unit 24 is changed.

During normal paper ejection, the copied transfer paper is directly ejected onto the copy ejection tray 38 shown in FIG. 2 through the lateral paper ejection guide 35. During double-sided copying, the transfer paper on which the front side has been copied is sent to the reversing guide 34 to reverse the conveyance direction, and sent through the lower paper ejection guide 36 to the paper refeeding unit 26 in FIG. After the paper is fed into a reversing guide 34 and its conveyance direction is reversed, it is ejected onto a copy ejection tray 38 through a horizontal ejection guide 35.

[0025] During composite copying, the first area (first half)
When conveying the transfer paper that has only been copied, the state is shown in FIG.
32B, is guided to the lower paper discharge guide 36 by the branch claw 33, and is discharged onto the paper refeed tray 26a of the paper refeed unit 26 by the pair of transport rollers 37, 37 shown in FIG. The transfer paper that has also been copied in the second area (second half) is discharged onto the copy discharge tray 38 through the horizontal discharge guide 35 in the same manner as in normal paper discharge.

FIG. 4 is a block diagram of the circulating automatic document feeder (RDH) 1 shown in FIG. This automatic document feeder 1 feeds documents D stacked on a table 40 one by one from the bottom.
The sheets are sequentially fed onto the contact glass 4 of the copying machine main body 2 in the direction of arrow A, and after a predetermined projection is made,
The document is discharged onto the document table 40 again from 1.

At this time, instead of directly discharging the document through the common paper path 42 in the direction of arrow B, the document is once switched back in the direction of arrow G and the document is moved in the discharging direction of the paper discharging roller 43 (arrow B). It is possible to select a reversal mode in which the sheet is returned to the opposite direction, reversed, and then discharged through the reversal sheet discharge path 44, and a non-reversal mode in which the sheet is discharged as is without being reversed.

The automatic document feeder 1 includes a common paper path 42 through which the document D passes in both the non-inversion mode and the inversion mode, and a common path 42 used to eject the document in the inversion mode. A reverse paper discharge path 44 is provided branching off from the paper path 42, and a reversal sheet discharge path 44 is provided at the branching portion for transferring originals to the common sheet path 4.
Arrow C1 direction to send to 2 and opposite arrow C2
An entrance roller 45 that rotates in forward and reverse directions, and an arrow H that is provided corresponding to the entrance roller 45 and enters the common paper passage path 42.
For documents conveyed in the direction shown in FIG. A plate-shaped feed pressure guide piece 4 that guides the paper to the paper discharge path 44
6 is provided.

The automatic document feeder 1 also includes a paper discharge roller 43 provided near a paper discharge port 41 that rotates only in the direction of the arrow to press the document passing through the common paper passage path 42. A movable pressure member 47 that rotates in the direction of arrow E and can be released from pressure to selectively enable or disable conveyance of the document in the paper discharge direction (direction of arrow B), and a reversing paper discharge path. A fixed pressure member 48 is provided to constantly press the document passing through the paper path 44 to the paper ejection roller 43, and in the reversal mode, the movable pressure member 47 discharges the document in the common paper path 42 in the direction of arrow B. The original is passed through the reversing paper ejection path 44 to the paper ejection port 4.
I am trying to discharge it from 1.

Further, the automatic document feeding device 1 includes an end plate 50 and a side plate 51 for setting and aligning the bundled originals D on the original table 40 in a fixed position, and an end plate 50 and a side plate 51 for setting and aligning the bundled originals D on the original table 40. A blower tank 52 that lifts the document D with compressed air blown in the direction of the arrow from a blow-out nozzle, and a vacuum tank 5 that lifts only the lowest document.
A conveyance device 55 is provided which uses the suction force from 3 to attract the paper to the paper feed belt 54, and pulls out and separates the paper into one sheet.

Further, on the paper feeding downstream side of the conveyance device 55, a first turn roller 57 for conveying the document D to the first turn paper path 56 and two pairs of conveyance rollers 58, 58 are provided. a horizontal conveyance path 60 that conveys the paper to the second turn paper passage path 59;
A second turn roller 61 provided in the turn paper passage 59, a conveyance device 62 in which a part of the conveyance belt contacts the contact glass 4 provided on the downstream side, and a branch serving as the entrance portion of the common paper passage 42. A switching claw 63 provided in the section is provided.

Furthermore, a reversal paper pull-out roller 6 is provided at the branching portion of the reversal paper ejection path 44 that branches from the common paper passage path 42.
4, and a branching claw 65 that switches back the original from the common paper path 42 to guide it to the horizontal conveyance path 60 when copying the back side again. A rotatable reversing drive roller 66 is provided respectively.

Reference numeral 67 is a partition lever rotatably attached to the outside of the blower tank 52.
It is provided to separate the originals D stacked on the 0 and the originals that are returned after projection, and to detect when the group of originals rotates greatly when the group of originals has completed one round.

When copying is started with a bundle of documents D placed on the document table 40 of the automatic document feeder 1 configured as described above, the blower tank 52 and the conveyance device 55 move the documents to the lowest position. Only the original is separated, and is sent from the first turn paper passage path 56 to the horizontal transport path 60 by the conveyance force of the first turn roller 57, and then to the second turn paper passage path 59.
By the conveying force of the second turn roller 61 and the conveying device 62, the image is sent to a predetermined projection position on the contact glass 4 and stopped.

When the lower surface of the original is scanned by the optical device 10 shown in FIG. The sheet is picked up and conveyed to the common paper path 42 while being pressed against the entrance roller 45 by the feed pressure guide piece 46 .

When the non-reversing mode document ejection is selected, the original is transported by the reversing drive roller 66 that rotates in the direction of the arrow F1, and further rotates in the same direction as the arrow F1. The document table 40 is pressed against the paper discharge roller 43 by the movable pressure member 47 and is moved from the paper discharge port 41 to the document table 40
is discharged to the top.

Further, when the document ejection in the reversal mode is selected, if the document is not directly ejected from the paper ejection port 41 and the trailing edge of the document passes the entrance roller 45, the reversal drive roller 66 is activated. The original is reversely rotated in the direction of arrow F2 to switch back the original.

As a result, the original is guided to the upper surface of the feed pressure guide piece 46, and is also guided to the reverse paper discharge path 4 by the conveyance force of the reverse pull-out roller 64 rotating in the direction of the arrow.
4, is pressed against the paper ejection roller 43 by the fixed pressure member 48, and is ejected from the paper ejection port 41 onto the document table 40 with the image surface reversed.

Note that during this switchback reversal, the movable pressure member 47 separates from the paper ejection roller 43 and retreats upward (as shown in the figure), thereby applying pressure to the document being switched back in the direction of arrow G in the direction of arrow B. It is designed so that almost no conveying force is applied.

Further, the switching claw 63 is rotated upward, and the rotation direction of the inlet roller 45 is changed from the C1 direction to the C2 direction.
By reversing the direction, the projected original can be moved straight in the direction of arrow I and ejected onto the original ejection tray 39 in FIG. 2.

FIG. 5 is a block diagram of the control section of the copying machine shown in FIG. 2, which includes a copying machine main body control section 100 and an RDH control section 200. The copying machine main body control section 100 includes an operation panel 70, a power supply section 101 that supplies DC voltage to each part of the copying machine, and paper feeding and transfer from the two-stage paper feeding cassettes 3A and 3B and the paper refeeding unit 26. A large number of unit controllers such as a paper feed controller 102 that controls paper conveyance, a lens controller 103 that moves the lens 9 in FIG. 2 when changing the magnification ratio, and a main controller that centrally controls these units. 11
Consists of 0.

[0042] The operation panel has a power supply unit 10 connected to the commercial power supply.
a main switch 71 that turns ON/OFF the power to 1;
Various switches and keys including a composite copy key 72 for specifying a composite copy mode and a copy start key (not shown) according to the present invention, various indicators including a count display for the number of copy sets and number of copies, and these Drive and control circuits etc. are provided, and the main control section 110
It is connected to the.

[0043] The main control unit 110 is a central processing unit (CPU).
), program memory (ROM), data memory (RA
A one-chip or multiple-chip microcomputer with M), I/O ports, etc. connected by a bus is used.

[0044] The unit control section, which is not shown, is as follows:
In addition to the above, there is a main motor control section that rotates the photoreceptor drum 13, etc., an optical device control section, a high voltage control section, a developing unit control section, a cleaning unit control section, a paper refeeding unit control section, etc. 110 controls each of these unit controllers according to the copy sequence.

[0045] The RDH control section includes a motor, a solenoid, and a
It controls clutches, sensors, etc., and also uses a microcomputer and interface line 80.
It is connected to the main control section 110 by. Therefore, the RDH 1 is operated in cooperation with the copying machine main body 2.

Next, the operation of the composite copy mode according to this embodiment will be explained. Pressing the composite copy key on the operation panel shown in FIG. 5 enters composite copy mode, and pressing this key again returns to normal copy mode.

In the composite copy mode, as described in the explanation of the prior art, images of two pages of a document (two pages in the case of a single-sided document, front and back sides in the case of a double-sided document) are printed on different sheets of transfer paper. area (for example, the first half S in the paper feeding direction shown in Figure 7)
1 and the second half S2). As a result, for example, as shown in Figure 8(a), you can make a composite copy of two A4-sized single-sided originals onto one A3-sized sheet of transfer paper at the same size,
Alternatively, as shown in (b), two A4-sized single-sided originals can be reduced to one A4-sized transfer sheet for composite copying.

First, a stack of originals for which composite copies are to be made is transferred to the automatic document feeder (RDH) shown in FIGS. 2 and 4.
A single-sided original is placed with the image side facing down, and a double-sided original is placed with the first side (front side: usually an odd-numbered page) facing down on the original table 40.

Then, continuous feeding is started in response to the copy start signal, and in the case of a single-sided original, the contact glass 4 is inserted from the bottom side.
After being sequentially fed upwards, the document fed into the common paper path 42 in FIG. let As a result, the originals are arranged and stacked in page order, and after one round, the originals are placed in the same state as the first time, so the second round of original feeding is started.

In the case of double-sided originals, there are the following two methods of feeding the original. (Part 1) A document is fed from the document table 40 onto the contact glass 4 with the first side facing downward, and is switched back from the common paper path 42 shown in FIG. 4 and sent to the horizontal conveyance path 60.
The sheet is fed through the second turn path 59 onto the contact glass 4 again by the conveying device 62 with the second surface facing downward. Thereafter, when the originals are returned to the original table 40 in the non-inversion mode described above, the first side faces downward and the originals are arranged and stacked in page order. Therefore, in this case, the documents are fed onto the contact glass 4 in the order of the front and back of the first sheet, the front and back of the second, the front and back of the third, and so on.

(Part 2) The originals are sequentially fed one by one onto the contact glass 4 from above the original table 40 with the first side (front side) facing downward, and each original is fed onto the original table 40 in the non-reversing mode described above. Return to top. As a result, each document is stacked with the second side (back side) facing downward, so after one round, each document is fed one more time from the bottom onto the contact glass 4 with the second side (back side) facing downward. , the original is returned onto the original table 40 again in the non-inversion mode. Therefore, in this case, the order is 1st front, 2nd front, 3rd front, ..., 1st back, 2nd back, 3rd back, etc. The document will be fed onto the contact glass 4.

On the other hand, on the copying machine main body 2 side, the following first process copying operation is executed during the first round of the original, and the second copy of the original is
In turn, the copy operation of the second process is executed.

(1) The control timing is set so that the copy image of the original is transferred to the first area (first half) of the first process transfer paper, and the image of the original that is sequentially fed by the RDH 1 is transferred to the optical device 10. , the electrostatic latent image formed on the photoreceptor drum 13 by the projection is visualized by the developing unit 15, and a new transfer from the paper feed cassette 3A or 3B is performed. Feed paper and transfer charger 1
After the visualized image (toner image) is transferred to the first area by 6, the transfer paper is sent through the fixing unit 24 and the switching unit 25 to the paper refeeding unit 26 and stocked.

(2) Set the control timing so that the copy image of the original is transferred to the second area (second half) of the second process transfer paper, which is located at a different position in the paper feeding direction from the first area, and use the RDH1 to perform the above-mentioned process. Each original of the original group that has passed through the feeding in the first process is sequentially re-fed, and the original image of the page that was not projected in the first process is projected onto the photoreceptor drum 13 by the optical device 10, and the projection The electrostatic latent image formed on the photoreceptor drum 13 is visualized by the developing unit 15, and the transfer paper on which the copy image has been transferred is fed from the paper refeeding unit 26 to the first area, and then the transfer charger 16 transfers the visualized image onto the second area of the transfer paper, and discharges it onto a copy output tray 38 through a fixing unit 24 and a switching unit 25.

Note that the control timing is set because it is necessary to shift the relative position between the transfer paper and the photosensitive drum 13 by half the length of the transfer paper in the paper feeding direction between the first process and the second process. For example, in the second process, the scanning start timing or paper feeding start timing of the optical device 10 is delayed from the first process,
One method is to increase the waiting time at the registration roller.

FIG. 1 shows the page relationship between the original and the copy when a composite copy is created using this method. (A) is for a single-sided original, and (B) is for a double-sided original that is fed using the second method described above. When feeding using the first method, it is the same as when making a one-sided copy. "Skip" in the diagram
There is no copy cycle, and in order to avoid creating unnecessary images in the area, for example, the photoreceptor drum 1 is erased by an eraser.
It is necessary to take measures such as exposing the entire surface of 3.

FIG. 6 is a flowchart showing the operation when creating a composite copy according to this embodiment. In this example, the control timing is set such that the start timing of the scanner of the optical device 10 is different between the first process and the second process. In addition, although odd-numbered pages of the manuscript are copied in the first round and even-numbered pages in the second round, it is also possible to copy even-numbered pages in the first round, and in that case, when the odd-numbered pages skip.

Furthermore, if n copies of composite copies are required, n copies of odd numbered pages may be copied in the first round, n copies of even numbered pages in the second round, or the number of copies of odd numbered pages may be copied in the second round. It is also possible to alternately copy pages and even-numbered pages one by one, and repeat this process 2n times. The transfer paper inside the copying machine is actually conveyed every other sheet.

By projecting and copying the image of the original every other page in this way, it is only necessary to execute the first process during the first round of the original, and only the second process during the second round. , the process mode only needs to be switched once. Therefore, the copy speed is approximately 1/2 that of normal continuous copying (approximately equivalent to normal continuous copying in page units)
This is approximately five times faster than conventional composite copying.

[0060]

[Effects of the Invention] As explained above, according to the composite copy making method of the present invention, copies that combine two pages of original into one page can be made at approximately the same speed as normal continuous copying on a page-by-page basis. This can significantly increase the copy speed when making multiple composite copies. Therefore, work efficiency when making copies for bookbinding can be greatly improved. Further, by performing reduction composite copying, it is possible to save paper resources and improve copy productivity.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the page relationship between an original and a copy when a composite copy is created according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing an example of a copying machine for carrying out the composite copy making method according to the present invention.

3 is a diagram showing details of the switching unit 25 in FIG. 2. FIG.

FIG. 4 is a diagram showing details of the automatic document feeding device in FIG. 2;

FIG. 5 is a block diagram showing the configuration of a control section of the copying machine shown in FIG. 2;

FIG. 6 is a flowchart showing the operation of the same copying machine when creating a composite copy.

FIG. 7 is an explanatory diagram of synthetic copying.

FIG. 8 is an explanatory diagram showing a specific example of synthetic copying.

[Explanation of symbols]

1 Circulating automatic document feeder (RDH) 2
Copying machine main body 3A, 3B Paper feeding cassette 4 Contact glass 10 Optical device 13 Photosensitive drum 14 Charging charger 15 Developing unit 16 Transfer charger 24 Fixing unit 25 Switching unit 26 Paper refeeding unit 40 Document table 42 Common paper path 44 Reverse discharge Paper path 60
Sideways running path 62 Conveying device 70 Operation panel 72
Synthetic copy key 100 Copier main body control unit 1
10 Main control section 200 RDH control section

Claims (1)

[Claims] 1. A document feeding device that circulates and feeds stacked documents, an optical device that projects an image of the document fed by the device onto a photoreceptor, and an image of an image formed on the photoreceptor by the projection. A developing device that visualizes the electric latent image, a normal paper feeding device that feeds new transfer paper, and a paper refeeding device that stocks and refeeds the transfer paper on which the copy image has been transferred. a transfer device that transfers the image visualized by the developing device on the photoconductor onto a transfer paper fed from the paper feeding device or the paper refeeding device; an image forming area on the photoconductor; and the transfer device. In a copying machine equipped with a timing control means for shifting the relative position of a transfer sheet on which an image is transferred by the device, the control timing by the timing control means is controlled so that a copy image of a document is transferred to a first area of the transfer sheet. Set,
The image of the document sequentially fed by the document feeding device is projected onto the photoreceptor every other page by the optical device, and an electrostatic latent image formed on the photoreceptor by the projection is formed by the developing device. A new transfer paper is fed from the paper feeding device, the visualized image is transferred to the first area of the transfer paper by the transfer device, and then the transfer paper is transferred to the first area of the transfer paper. In the first process of sending the paper to the paper refeeding device, the control timing by the timing control means is set so that the copy image of the document is transferred to a second area of the transfer paper whose position in the paper feeding direction is different from the first area. , the document feeding device sequentially re-feeds each document of the document group that has been fed in the first process, and the document image of the page that was not projected in the first process is exposed to the light by the optical device. The electrostatic latent image is projected onto the body, and the electrostatic latent image formed on the photoreceptor by the projection is visualized by the developing device, and the transfer paper on which the copy image is transferred from the paper refeeding device to the first area is transferred. A second process of feeding paper and transferring the visualized image to the second area of the transfer paper by the transfer device, and sequentially performing the first process and the second process. Synthetic copy method.