JPH07106838B2 - Duplex copying machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided copying machine for obtaining double-sided copying from a double-sided original.

2. Description of the Related Art When copying an original using an electrostatic copying machine, the original is placed on a flat platen glass in order to read the original image, and a light source, a reflecting mirror, or the like is placed on the stationary original. There is a method in which the exposure means is scanned along the document surface to form a document image on the photoconductor to perform the exposure operation. On the other hand, there is a method in which the exposure means is stopped and the originals are sequentially moved one by one with respect to the exposure means to read the original image, and the exposure operation to the photoconductor is performed. Generally, when copying a plurality of sheet originals having the same size, the latter method can realize a faster and more efficient copying operation than the former method.

FIG. 6 shows the configuration of a conventional copying machine capable of performing the above-mentioned copying operation. A transfer type electrostatic copying machine (hereinafter, simply referred to as a "copying machine") 1 has a circulation type in which a sheet-shaped document D is sequentially conveyed one by one to the reading positions 3 and 4 of the main body 2 above the main body 2. An automatic document feeder (hereinafter, simply referred to as “document feeder”) 5 is provided. A plurality of documents D arranged in page order are stored in the document storage unit 6 of the document supply device 5. At this time, the document D is placed so that the document surface of the first page faces the lower side.

Documents D in the document storage unit 6 are conveyed one by one to the conveyance path 8 by the paper feed roller 7 in order from the document located at the uppermost position. The document Di transported on the transport path 8 is wrapped around the first document support tube 9 and the document image on one surface thereof is presented at the first reading position 3. Next, the document Di is conveyed to the second document support cylinder 11 after the conveyance direction is reversed via the switchback path 10. The original document image on the other surface of the original document Di is presented at the second reading position 4 while being wound around the original document support tube 11. Manuscript Di which has been presented
Is returned to the lowermost position of the document D stored in the document storing means 6 by the storing and conveying means 13 via the conveying path 12.

Inside the main body 2 of the copying machine, there is provided an exposing means 14 for reading an original image presented at the reading positions 3 and 4 and performing an exposure operation for the photoconductor 22. The exposure means 14 includes a light source 15 and reflecting mirrors 16 and 1.
A moving body 21 having 7,18, a lens 19, a reflecting mirror 20, and the like, and including the light source 15 and the reflecting mirror 16 moves to a position directly below the reading positions 3 and 4, respectively, and is presented at these reading positions 3 and 4. The original image is passed through the reflecting mirrors 16 to 18, the lens 19 and the reflecting mirror 20, and the photoconductor 22
An electrostatic latent image is formed on the surface of the photoconductor 22 which has been image-formed on the surface of the photoconductor 22 and which has been previously charged by the charging corona discharger 23. This electrostatic latent image is developed by the developing device 24 as the photoconductor 22 rotates clockwise.
The image is visualized by the transfer corona discharger 25 and transferred onto the recording paper P conveyed from the paper feed trays 26, 27, 28 or the intermediate storage means 29.

The recording sheet P after the transfer is conveyed to the fixing device 31 by the conveying means 30 and fixed. The recording paper P after fixing is sent to the finishing means 33 when copying is completed. Further, when copying is performed on both surfaces, the recording paper P whose copying on one surface is completed
Switch path 132 to arrow 133 direction, then arrow
After being conveyed in the direction of 134, it is accumulated in the intermediate storage means 29 and temporarily stored. From the intermediate storage means 29, the recording paper P is again conveyed to the photoconductor 22 in response to the reading and exposing operation of the original image on the other surface of the original Di, and the transfer to the other surface is performed.
The recording paper P after transfer is sent to the finishing means 33 via the conveying means 30 and the fixing device 31. In the finishing means 33, spelling and punching of the recording paper P and binding processing are performed,
The offset trays 32 are sorted one by one and discharged.

As described above, in the copying machine 1 including the document feeding device 5,
The document D is conveyed to the reading positions 3 and 4, respectively, and in cooperation with the operation of presenting each document image on one surface and the other surface thereof,
A corresponding electrostatic latent image is formed on the photoconductor 22 each time, and the image is visualized and recorded on the recording paper P. As described above, in the electrostatic copying machine, the laser printer, etc., the characteristics of the electrophotographic technique such as the production of the original plate (the formation of the electrostatic latent image on the surface of the photoconductor and the visualization thereof) are performed at each recording operation, It is possible to perform a recording operation that cannot be performed by an ordinary printing machine, in which the copy paper is sequentially finished in units of one copy for one set of copy originals.

FIG. 7 schematically shows a document feeding operation state of the document feeding device 5 of the copying machine 1 and a recording sheet feeding operation state of the copying machine main body 2. In FIG. 7, first on both sides
Assuming a case where two-sided copying is performed from a total of four originals having originals images of pages 8 to 8, the even numbered pages (second to eighth pages) of the original feeding device 5 are moved to the first reading position 3. Consider a case where the first cycle of the feeding operation of 1 is finished and a paper jam occurs in the copying operation of the second cycle of feeding the original stored in the original storing means 6 to the second reading position 4 again.

If a paper jam occurs in the recording paper conveyed in the copying machine main body 2 at the fifth page of the operation of presenting an odd number of pages of the original to the second reading position, the paper jam recording paper P3 in the main body 2 is removed. A recording sheet that can be fed from the intermediate storing means 29 to the photoconductor 22 even if the original D3 stopped on the conveying path in the original feeding device 5 is returned to the uppermost part of the original storing means 6 and the copying operation is continued. Is the recording paper P2 with the fourth page copied on one surface. The recording paper obtained by such a copying operation has the page order of the front and back surfaces shifted except for the recording paper P4 which has already been recorded on both sides and is discharged to the tray 32a, and the first page of the original D1. On the other surface of the recording paper P1 to be copied, the third page of the document D2 is copied and discharged, and is not recorded.

When such a paper jam occurs, in order to discharge the recording paper arranged in page order onto the tray 32a, the third sheet of the document D2 should be ejected.
Before copying the page, the sixth page of the document D3 is manually copied on one surface of a new recording paper P5 in advance, and this recording paper P5 is copied on the uppermost part of the paper feed tray 26 on the other surface. Place it like this, copy the 5th page of the manuscript D3 and complete double-sided copying,
The copying operation before the paper jam occurs must be continued.

As described above, conventionally, without discarding the recording paper which has been copied on both sides or at least one side thereof,
In order to arrange the recording paper discharged onto the tray 32a in page order, the complicated procedure and time described above are required. It is also possible to restart copying from the beginning without performing such complicated copying work. However, in that case, all the recording papers P1 to
Since P4 is discarded, there is a problem that the loss of recording paper is large.

An object of the present invention is to reduce the time required for processing when an undesired situation such as a paper jam that has no choice but to interrupt the recording operation occurs when recording on both front and back sides of a plurality of recording papers. It is an object of the present invention to provide a double-sided copying machine which can reduce the trouble and minimize the loss.

Means for Solving the Problems According to the present invention, a double-sided document stacked in a document storage unit is presented at a first reading position, and then the document is inverted by a reversing unit and presented at a second reading position. Feeding means for feeding recording paper, copying means for copying the original images of the original presented at the first and second reading positions onto the surface of the recording paper, and the original image at the first reading position for feeding The intermediate storage means for stacking and storing after being copied by the copying means on one surface of the recording paper from the means, and the recording paper of the intermediate storage means is taken out from either the uppermost part or the lowermost part, and is transferred to the copying means. In a double-sided copying apparatus that includes a take-out unit that guides the original image at the second reading position to the other surface of the recording paper to obtain a double-sided copy from a double-sided original, the take-out unit includes the recording paper of the intermediate storage unit as the uppermost portion. Or at the bottom It is configured so that it can be picked up from either the misalignment or the other side, and it detects paper jams in recording paper or originals, and responds to the detection output of the detection means, and after the paper jam is cleared, paper jams from the original storage means The original corresponding to the above is presented at the first reading position, and the original image is copied on the recording paper from the paper feeding means by the copying means and is stored in either the uppermost or the lowermost of the intermediate storing means. A duplexer characterized by including control means for taking out the stored recording paper by means of taking-out means and copying the original image presented at the second reading position of the original corresponding to the paper jam by copying means. It is a device.

Operation According to the invention, one surface of a double-sided original stacked in the original storing means is presented at the first reading position, the original is inverted by the inverting means, and the other surface of the original is read by the second reading. The recording paper presented at the position and fed from the paper feeding means is copied by the copying means onto one surface of the recording paper of the original image presented at the first reading position, and is stacked and stored in the intermediate storage means. In this way, the original image on one surface of each original to be copied is copied on one surface of the same number of recording sheets as the number of originals and stacked on the intermediate storing means, and thereafter, by the take-out means, the recording sheets in the intermediate storing means are printed. The recording paper is taken out from either the top or the bottom, and the original image on the other surface of the original presented at the second reading position is taken out so as to be copied on the other surface of each recording paper.
In this way, the original image of the double-sided original is copied on both the front and back sides of the recording paper. If a recording paper or document jam occurs, and that is detected by the detection unit, and the recording paper jams, remove the recording paper and place the document corresponding to the jam in the document storage unit. When the sheets are returned and stacked, or when a document is jammed, the document is taken out and returned to the document storing means, and the document corresponding to the paper jam is presented from the document storing means to the first reading position, and the paper feeding means is provided. To a new recording paper from
The intermediate storing means is stored in the other one of the uppermost portion and the lowermost portion, and is different from the taking-out method by the taking-out means for the double-sided copying from the other of the intermediate storing means, that is, in a normal state in which no paper jam occurs. Then, the original image presented at the second reading position is copied by the copying means on the other surface of the recording paper thus taken out.

The take-out means can take out the recording papers located in the lowermost part of the recording papers stacked in the accommodating means in order, and can also take out in order from the recording papers located in the uppermost part. Therefore, when the recording paper for which recording on one surface has been completed is temporarily stored in the storage means and then conveyed to the recording means again to perform recording on the other surface, there is no choice but to interrupt the recording operation such as paper jam. When a desired situation occurs, the recording paper for which recording has been interrupted is discarded, a new recording paper is conveyed to the recording means, and the recording on the other side is performed again, and the recording paper stacked in the storing means is re-recorded. Store at the top. Next, the take-out means takes out the recording paper stored in the uppermost part of the storage means, conveys it to the recording means, and performs the interrupted recording on the other surface again.

Next, the take-out means sequentially takes out the recording papers located at the bottom of the remaining recording papers stacked in the storing means, conveys them to the recording means, and continues the recording on the other surface which has been interrupted. By such an operation, the double-sided recording apparatus can quickly reproduce the corresponding recording paper even when the recording operation is interrupted during the conveyance of the recording paper, and perform the recording with the recording order on the front and back sides.

First Embodiment FIG. 1 shows a basic structure of a transfer type electrostatic copying machine (hereinafter, simply referred to as “copier”) 41 including a circulating automatic document feeder (hereinafter, simply referred to as “manuscript feeder”) 40. It is sectional drawing shown. At the top of the main body 42 of the copying machine 41, a document feeder 40
And a pressing plate 36. The document feeding device 40 is provided with a right cylindrical first document supporting cylinder 50 and a second document supporting cylinder 51 having a horizontal rotation axis, and immediately below them is a first transparent body 42 along the axis thereof. A plate 37 and a second transparent plate 38 are formed, and a first reading position 43 and a second reading position, respectively.
Make up 44.

A third transparent plate 39 is formed on the pressing surface of the pressing plate 36 against the main body 42 and constitutes a third reading position 45. The original image of a book bound into a book is presented and read at the third reading position 45, and the exposure operation is performed.

Sheet-shaped originals D having the same size and arranged in the order of a plurality of pages
Is placed in the document storage means 46 of the document supply device 40 so that the document surface of the first page faces downward. The document D stored in the document storage means 46 is fed from the upper side thereof with a paper feed roller.
The sheets 47 are brought into contact with each other, so that the originals located at the top are fed one by one to the conveyance path 48.

The transport path 48 includes a pair of guide members and a plurality of rollers provided along the transport direction, and transports the fed document Di to the first document support tube 50. Document Di is the first document support tube
The document image on one surface is conveyed along the outer peripheral surface of 50 while presenting it to the first reading position 43. Next, the document Di is guided along the reversing path 52, its transport direction is reversed, and then the document Di is transported to the second document support cylinder 51 by the direction changing claw 35. The document Di whose conveyance direction is reversed is conveyed along the outer peripheral surface of the second document support cylinder 51 to present the document image on the other surface to the second reading position 44.

The document Di whose presentation of the document placement on both surfaces is completed is stored in the document storage means by the storage / transport means 53 via the transport path 49.
The plurality of documents D stored in 46 are returned to the lowest position.

An exposure unit 54 is provided inside the main body 42 of the copying machine, and an original image presented at the first to third reading positions 43 to 45 is displayed.
An image is formed on a right cylindrical photosensitive member 62 having a horizontal axis of rotation and driven to rotate clockwise. In the exposure means 54, the light source
The moving body 61 including the 55 and the reflecting mirror 57 is displaced to the first to third reading positions 43 to 45, respectively, and reflects the reflected light of the presented document image to the reflecting mirrors 58 and 59, the lens 56, and the reflecting mirror 60. To form an electrostatic latent image on the surface of the photoconductor 62 that has been previously charged by the corona discharger 63 for charging.

The electrostatic latent image formed on the photoconductor 62 is visualized as a toner image by the developing device 65 as the photoconductor 62 rotates clockwise, and the one surface of the recording paper P is transferred by the transfer corona discharger 64. Is transcribed to. The recording paper P is previously fed to the paper feed trays 66, 67,
It is housed in 68 and is guided to the transfer area of the photoconductor 62 by the conveying means 34 including the registration roller 34a. The recording paper P on which the toner image has been transferred is guided from the conveying means 70 to the fixing device 71 and fixed. A recording unit is configured to include the photoconductor 62, the developing device 65, the charging and transferring corona dischargers 63 and 64, and the fixing device 71.

The recording paper P having the toner image fixed by the fixing device 71 is
The switchback path is indicated by the arrow 111 by the direction changing means 76.
Direction, and then the direction of arrow 112, the conveyance direction of the recording paper P is reversed, and the recording paper P is stacked and temporarily stored in the intermediate storage means 69 from the transport path 80. The recording paper P stacked in the intermediate storage means 69 is again guided to the transfer area of the photoconductor 62 by the take-out means 77 or the take-out means 78, and the toner image is transferred to the other surface of the recording paper P. Recording paper P after transfer
Is the finishing means after passing through the conveying means 70 and the fixing device 71.
Sent to 72.

Here, when one surface of the document Di is exposed, the moving body 61 is located immediately below the first reading position 43, and when the other surface is exposed, it is located immediately below the second reading position 44. In the case of a document such as a book, the moving body 61 is the third
Exposure is performed by scanning the reading position 45. Thus the original D
Both the front and back sides of the above are copied on the front and back sides of the corresponding recording paper P, respectively. From the paper feed trays 66, 67, 68, recording papers P having different sizes are selectively conveyed to the photoconductor 62.

The recording paper P, which has been copied on both front and back sides, is once held in the tray 79 of the finishing means 72, and when a copy corresponding to one set of a plurality of documents D is completed, it is bound by the stapler 73 or the puncher 74. After being subjected to processing such as punching binding holes, the sheets are sorted and discharged to the offset tray 75. Such a series of copying work is performed on the manuscript D of one section.
Is repeated until a desired number of copies are made.

In this embodiment, the recording sheet P is reversed in the conveying direction by the direction changing means 76 before being stored in the intermediate storing means 69, and the recording surface thereof is switched from one surface to the other surface. However, the present invention is not limited thereto, and for example, the intermediate storage means 69.
The recording surface may be switched when the recording paper is fed from the to the photoconductor 62.

FIG. 2 is a sectional view showing a simplified configuration of the intermediate storage means 69. The recording paper P conveyed from the direction changing means 76 via the conveying path 80 is stacked and stored on the bottom portion 106 of the intermediate storing means 69. Extraction means 77 and 78 are provided on the recording paper ejection side of the intermediate storage means 69, and the recording papers stacked on the bottom portion 106 are sequentially ejected from the recording papers located at the lowest position and located at the uppermost position. It can be taken out in order from the recording paper.

The take-out means 77 is configured to include a suction conveyance means 81, an exhaust duct 83, and a pair of conveyance rollers 85. Removal means 78
Is configured to include an adsorbing and conveying means 82, an exhaust duct 84, and a pair of conveying rollers 86.

The suction conveyance means 81 is provided on the lower side in the stacking direction of the recording paper P stacked on the bottom portion 106, and has a driving roller 93a and a driven roller 9a.
An endless conveyor belt 97 having a plurality of suction holes 95 scattered is wound around 3b. Drive roller 93
A motor M1 is connected to the rotating shaft of a through an electromagnetic clutch CLT1 (not shown). An intake duct 87 is provided on the inner surface side of the conveyor belt 97 so as to face the upper stretched portion 97a, and is connected to the induction fan 90 via a solenoid valve 102.

An exhaust duct 83 is provided on the downstream side of the suction conveyance means 81 in the conveyance direction of the recording paper P and is connected to a pushing fan 89. Further, a pair of transport rollers 85 is provided on the downstream side in the transport direction of the recording paper P.

Adsorption transport means 82 provided on the upper side in the stacking direction of the recording paper P
An endless conveyor belt 98 having a plurality of suction holes 96 scattered around the drive roller 94a and the driven roller 94b is wound around. The motor M1 is connected to the rotary shaft of the drive roller 94a via an electromagnetic clutch CLT2 (not shown). An intake duct 88 is provided on the inner surface side of the conveyor belt 98 so as to face the lower stretched portion 98a, and is connected to an induction fan 90 via a solenoid valve 103.

An exhaust duct 84 is provided on the downstream side of the suction conveyance means 82 in the conveyance direction of the recording paper P, and is connected to a pushing fan 89. Further, a pair of transport rollers 86 is provided on the downstream side in the transport direction of the recording paper P.

The recording paper P from the direction changing means 76 is placed at the bottom of the intermediate storing means 69.
The conveying path 80 that guides onto 106 is formed by a pair of guide members 105. Paper exit on the downstream side of the transport path 80 in the transport direction
A pair of delivery rollers 104 are disposed near 107 to eject the recording paper to be conveyed onto the bottom portion 106. A pair of guide members 1
The lower side of 05 bends in an inverted L-shape at the sheet discharge port 107, and the rear end portion (second portion) of the recording paper P stacked on the bottom portion 106 in the transport direction.
In the drawing, the end portion of the recording paper P is aligned by contacting the left end portion). Further, the pair of guide members 105 and the sending-out roller 104 that form the transport path 80 are provided so that the displacement can be adjusted over the interval l1 between the position shown by the solid line and the position shown by the two-dot chain line in FIG.

When the recording paper P is once stored on the bottom 106 of the intermediate storage means 69 and is then conveyed again by the take-out means 77 or 78, the pair of guide members 105 are displaced as described above. The feeding state of the recording paper P to the suction conveyance means 81, 82 is optimized.

When the recording paper P is re-supplied from the intermediate storage means 69 from the lower side in the stacking direction, the drive roller 93a of the suction conveyance means 81.
The electromagnetic clutch CLT1 provided in the is connected. As a result, the rotational power from the motor M1 is transmitted to the drive roller 93a, and the conveyor belt 97 is rotationally driven in the arrow 109 direction. At this time, the attraction fan 90 and the pushing fan 89 are also activated, and the solenoid valve 102 is opened at a predetermined timing. As a result, the intake duct 87 becomes an induction fan.
The suction operation of the recording paper P is started via the suction hole 95 of the transport belt 97 which is in communication with 90 and is rotationally driven.

On the other hand, from the loosening nozzle 91 of the exhaust duct 83 provided on the downstream side of the recording paper P in the paper feeding direction, the air blown from the pushing fan 89 is blown to the end surface of the recording paper P, and this air layer forms the recording paper. One sheet of sheet P is separated at the end portion on the downstream side in the sheet feeding direction. As a result, the separated recording sheet is attracted to the outer peripheral surface of the upper portion 97a of the conveyor belt 97, and the conveyor belt 97
It is conveyed in the direction of the arrow 109 in accordance with the rotational drive of, and is further conveyed by the conveying roller 85 to the transfer area of the photoconductor 62 via the conveying path 108.

When the recording paper P is re-supplied from the intermediate storage means 69 from the upper side in the stacking direction by the take-out means 78, the suction conveyance means
The electromagnetic clutch CLT2 provided on the drive roller 94a of 82 is brought into the connected state. As a result, the rotational power from the motor M1 is transmitted to the drive roller 94a, and the conveyor belt 98 is rotationally driven in the direction of arrow 110. At this time, the attraction fan 90 and the pushing fan 89 are also activated, and the solenoid valve 103 is opened at a predetermined timing. This allows the intake duct 88
Is connected to the induction fan 90 and is driven to rotate.
The suction operation of the recording paper P is started through the suction holes 96 of the.

On the other hand, from the loosening nozzle 92 of the exhaust duct 84 provided on the downstream side of the recording paper P in the paper feeding direction, the air blown from the pushing fan 89 is blown to the end surface of the recording paper P, and this air layer forms the recording paper. One sheet of paper P is separated at the end portion on the downstream side in the paper feeding direction and floats to the suction conveyance means 82 side. As a result, 1 is separated and floated on the outer peripheral surface of the underhang portion 98a of the conveyor belt 98.
A sheet of recording paper is adsorbed, is conveyed in the direction of arrow 110 as the conveyor belt 98 is driven to rotate, and is further conveyed by the conveyor roller 86 to the transfer area of the photoconductor 62 via the conveyor path 108.

As another means for taking out the recording paper P stored in the intermediate storage means 69 from the upper side and the lower side in the stacking direction, the recording paper P is brought into contact with the recording paper positioned at the top or the bottom of the stacked recording papers P. The paper feed roller and the recording paper fed by the paper feed roller may be configured to include a separating roller that rotates in the same direction and has outer peripheral surfaces having different frictional forces on the recording paper.

Although not shown in the figure, a plurality of detectors S1, S2, ... Are arranged at predetermined intervals in the document transport path of the document feeder 40 and the recording sheet transport path of the copying machine main body 42. It The paper jam of the original and the recording paper is detected based on the output timing of the detector which is determined by the conveying speed of the original and the recording paper and the distance between the detectors. That is, in the pair of detectors along the conveyance path, after the original (or recording paper) is detected by the detector on the upstream side in the conveying direction, the original (or the recording paper) is detected by the detector on the downstream side in the conveying direction after a predetermined time set by the timer elapses (or If recording paper) is not detected, it is determined that a paper jam has occurred.

FIG. 3 is a block diagram showing the electrical configuration of the copying machine 41. In the configuration of the copying machine 41, motors M2, M3, ... For rotating and driving a plurality of rollers such as the motor M1 for rotationally driving the conveying rollers 85, 86 and drive rollers 93a, 94a, etc. Is connected to the motor drive circuit 120. Electromagnetic clutch C provided on drive rollers 93a, 94a, etc.
LT1, CLT2, ... Are connected to the clutch drive circuit 121.

Electromagnetic solenoids SOL1 and S that drive the direction change pawls 35 and drive members in the reversing path 52 including the solenoid valves 102 and 103.
OL2, ... Are connected to the solenoid drive circuit 122.
These drive circuits 120-122 are interface circuits 128.
It is connected to the.

The interface circuit 128 includes a DC power supply 127, detectors S1 and S for detecting the conveyance state of the document D and the conveyance state of the recording paper P.
2, ..., Drive circuit 123 for driving exposure means 54, and further main body 4
2, the input operation keys 126 of the operation panel 125,
A display drive circuit 124 for driving the display device 132 of the operation panel 125 and the like are connected.

The interface circuit 128 is connected to a control circuit 129 realized by a microcomputer or the like, sends a detection signal from the detector or the like to the control circuit 129, and sends a control signal from the control circuit 129 to the various drive circuits 120.
Send to ~ 124. A read only memory (ROM) 130 and a random access memory (RAM) 131 are connected to the control circuit 129. According to the control program stored in advance in the memory 130, the control circuit 129 causes the copying machine main body 4
2 and the document feeder 40 cooperate to control the copying operation. The memory 131 is used as a calculation area such as a counter or a timer necessary for controlling the copying operation.

Further, the interface circuit 128 drives the exposure means 54 via the drive circuit 123 and controls the turning on / off of the light source 55 at the first to third reading positions 43 to 45. Further, the interface circuit 128 sends a signal input by the input operation key 126 of the operation panel 125 to the control circuit 129, and also displays information regarding the progress status of the copying operation, for example, the paper jam position of the recording paper P. The display device 132 is driven and displayed by 124.

Furthermore, the interface circuit 128 includes a document feeder 4
Select switch SSW1 to S that selects the copy mode using 0
SW4 is connected as part of the operation panel 125. As a mode for copying a plurality of copies from one set of a plurality of originals D, various copying modes such as a single-sided original to a single-sided copy, a single-sided original to a double-sided copy, a double-sided original to a single-sided copy, or a double-sided original to a double-sided copy are selected. To be done.

With reference to FIG. 1, description will be given of a copying operation in the case of making a double-sided copy from a double-sided original.

The double-sided originals D arranged in page order are placed by the operator in the original storing means 46 so that the original surface of the first page faces downward. The operator inputs the input operation keys 126 on the operation panel 125.
When the start of copying is instructed by, the document feeder 40 starts the operation of feeding the document D. As a result, the document D is conveyed to the first reading position 43 in order from the document of the last page, and the document image of the even page is read. Then, the document conveyed to the second reading position 44 through the conveyance path 52 is the second reading position 44.
Then, the original image of the odd-numbered page is returned to the lowermost portion of the original storing means 46 without being read.

In synchronism with the operation of supplying the document D to the first reading position 43, the recording paper P is conveyed from the paper feed tray 66 to the photoconductor 62 in the copying machine main body 42, and the even-numbered pages of the document D are transferred. The recording sheets P are stacked and temporarily stored in the intermediate storing means 69 via the conveying means 70, the fixing device 71, and the direction reversing means 76.

When the first circulation of the document D in the document supply device 40 is completed in this way, the recording paper P having one surface of the even number page of the document D copied is stacked in the intermediate storage means 69 of the copying machine main body 42. .

Next, in the document feeding device 40, the feeding operation of the second circulation of the document D is started, and the document D stored in the document storing means 46 is sequentially conveyed from the document located at the uppermost position. The document Di conveyed is not read at the first reading position 43, and after the original image of the odd number page of the document D is read at the reading position 44 through the reversing path 52, the original document Di is again read through the conveying path 49. It is stored in the storage means 46 from the lower side.

In synchronism with the document feeding operation of the document feeding device 40, in the copying machine main body 42, the recording sheets P stacked from the intermediate storing means 69 are sequentially taken out by the take-out means 77 from the recording paper located at the bottom. It is conveyed to the transfer area of the photoconductor 62. At this time, the recording sheet P conveyed to the photoconductor 62 has its conveying direction reversed in advance by the direction changing means 76, and its recording surface is switched to the other surface. Therefore, the recording paper P
, An original image corresponding to an odd page of the original D read at the second reading position 44 of the original feeding device 40 is transferred to the other surface. The recording paper P after the transfer is conveyed by the conveying means 70 and the fixing device 71.
And is sent to the tray 79 of the finishing means 72.

FIG. 4 is a flow chart for explaining a copying operation according to the present invention, and FIG. 5 is a document feeder 40 and a copying machine main body.
FIG. 6 is a schematic diagram for explaining a cooperative operation with 42. In FIG. 5, for simplification, one set of four originals arranged in page order having the original images of pages 1 to 8 on the front and back sides is 1
The following is a case of making a double-sided copy.

Referring to FIG. 4, when the start of copying is instructed in step n1, the process proceeds to step n2, and the copying machine 41 performs a series of copying operations. In step n3, it is determined that a paper jam has occurred,
If no paper jam has occurred, the process proceeds to step n4, where it is determined that a series of copying operations have been completed. When the series of copying operations is completed, the copying machine 41 temporarily stops the copying operation and enters the standby state. If the copying operation is not completed, return to step n2,
The copy operation continues.

In step n3, when it is determined that the document is jammed in the document feeder 40 or the recording paper is jammed in the copying machine main body 42, the document feeding apparatus 40 and the copying machine main body 42 perform the feeding operation of the document and the recording paper. Both are temporarily stopped. In particular, in this embodiment, as shown in FIG. 5A, the recording paper P once stored in the intermediate storage means 69 after the copying of the even pages of the document D onto one surface of the recording paper P is completed.
An example will be described below in which the recording paper is jammed at the fifth page when the sheet is conveyed again to the photoconductor 62 and the odd-numbered pages are transferred.

When it is determined in step n3 that a paper jam has occurred, the process proceeds to step n5, and the display device 132 displays the paper jam location and the message "Please clear the paper jam" for the operator. The paper jam location is displayed by, for example, a jam map, which is a simplified transport path in the copying machine 41. A display element is provided at a key point in the middle of the transport path, and when a paper jam occurs, a corresponding position is displayed. This is done by activating the device.

In step n6, when the operator removes the jammed recording paper P3 of the copying machine main body 42 according to the above display, step n7
Go to. In step n7, the display device 132 prompts you to "Remove the document in the transport path and return it to the top of the hopper."
Is displayed. Follow this display to step n8
If it is determined that the operator has returned the document D3 to the document storing means 46, the process proceeds to step n9. In step n9, "Please press the copy start button" is displayed.
At n10, the pressing operation is judged.

When the copy start button of the input operation key 126 is pressed, the copying machine 41 reproduces the recording paper P3 lost due to the paper jam based on the operation described below.

As shown in FIG. 5 (2), a recording paper P5 is newly created in which the sixth page lost due to the paper jam is copied.
That is, in step n11, the document D3 being conveyed in the document supply device 40 at the time of paper jam occurrence is replaced with the document storing means.
The paper 46 is again conveyed to the first reading position 43, and in synchronization with this, a new recording paper P5 is conveyed from the paper feed tray 66 to the photoconductor 62.
In this way, the original image of the sixth page read at the first reading position 43 is transferred onto one surface of the recording paper P5, and after fixing is completed, the uppermost portion of the recording paper stacked in the intermediate storing means 65 through the direction changing means 76. To store. The document D3 from which the document image of the sixth page has been read is fed by a document feeding device as shown in FIG. 5 (3).
The reversal path 52 of 40 is once stopped and put in a standby state.

Next, at step n12, as shown in FIG. 5 (3), the recording paper P5 in which the sixth page has been copied stored in the intermediate storage means 69 is taken out from the upper side in the stacking direction of the recording paper. It is taken out by 78 and is fed to the photoconductor 62. The document D3, which has been waiting in advance in the reversing path 52 of the document feeding device 40, is conveyed to the second reading position 44 at the feeding timing. As a result, the original image of the fifth page is read and transferred to the other surface of the recording paper P5 having the sixth page copied on one surface. The recording paper P5 on which the transfer is completed is sent to the finishing means 72 via the carrying means 70 and the fixing device 71.

When the operation of step n12 is completed, the process proceeds to step n4, and it is judged that a series of copying operations are completed. If the series of copying operations have not been completed, the process returns to step n2 to continue the copying operation.

As described above, in this embodiment, when the recording paper P3 is jammed in the copying operation, the jammed recording paper P3 is reproduced in step n5 to step n12, and then the interrupted remaining copying operation is performed. Be seen. In that case, the recording paper that must be discarded during the copying operation due to the paper jam is only one of the recording papers P3 in which the paper jam has occurred, and the loss is small. When a paper jam occurs, it is only necessary to redo the copy of the recording paper P3 only, and it is not necessary to redo all of the recording paper. Therefore, the copy operation that was interrupted after the paper jam occurred is restarted. The recovery time is short and the efficient copying operation is performed.

In the above-described embodiment, the case where the recording paper P3 is jammed in the copying machine main body 42 has been described. However, when the recording paper P3 is conveyed in the copying machine main body 42 due to the jamming of the document in the document feeding device 40, the recording is performed. The same recovery operation is possible even when the paper is stopped and the copying operation is interrupted.

According to the present invention, the double-sided original from the original storing means is presented at the first reading position, so that one side of the recording paper from the paper feeding means is copied by the copying means and stacked on the intermediate storing means. Next, the recording paper from the intermediate storage means is taken out from either the uppermost part or the lowermost part, and the second
The original image of the other surface of the original presented at the reading position is copied to the other surface of the recording paper, thus making it possible to obtain a double-sided copy from a double-sided original, and the detection unit detects the paper jam of the recording paper or the original. When the paper jams, remove the jammed recording paper, return the original to the original storage unit, and when the original jams, store the original with the paper jam. To the first reading position, and the new recording paper from the paper feeding means is printed on one surface, and the original image on one surface of the original is copied and intermediately stored. The image of the original when the other surface of the original is presented at the first reading position is stored in the other of the uppermost portion or the lowermost portion of the means, and is placed in front of the uppermost portion or the lowermost portion of the intermediate storing means. On the other surface of the recording paper is taken out by the take-out means the recording sheet from the other one, is copied original image of the other surface of the document. If the recording operation is interrupted due to a paper jam in the conveyance path or a temporary stop of the conveyance operation, you can discard only the recording paper for which recording has been interrupted, and print on both sides of the obtained recording paper. The recording operation can be performed properly. Therefore, the loss of the recording paper is minimized, the time for dealing with the interruption of recording is shortened, the labor is reduced, and the functionality and operability of the double-sided recording apparatus are improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing the basic structure of an embodiment of the present invention,
2 is a sectional view showing a simplified configuration of the intermediate storage means 69, FIG. 3 is a block diagram showing an electrical configuration, FIG. 4 is a flow chart for explaining a copying operation, and FIG. 5 is one embodiment of the present invention. FIG. 6 is a schematic view showing the operation of the example, FIG. 6 is a cross-sectional view showing the configuration of a conventional typical copying machine 1, and FIG. 7 is a schematic view explaining paper jam in the copying machine 1. 1,41 …… Copier, 2,42 …… Copier body, 5,40 …… Document feeder, 14,54 …… Exposure means, 22,62 …… Photoconductor, 23,63
...... Corona discharger for charging, 24,64 ...... Corona discharger for transfer, 25,65 …… Developing device, 29,69 …… Intermediate storage means, 31,7
1 ... Fixing device, 76 ... Direction changing means, 77,78 ... Ejecting means

Claims (1)

[Claims] 1. A means for presenting a double-sided original stacked in an original storing means at a first reading position, then inverting the original by a reversing means and presenting it at a second reading position, and a recording paper. The paper feeding means, a copying means for copying the original images of the original presented at the first and second reading positions onto the surface of the recording paper, and the original image at the first reading position is recorded on the recording paper from the paper feeding means. The intermediate storage means for stacking and storing after being copied by the copying means on one surface, and the recording paper of the intermediate storage means is taken out from either the uppermost part or the lowermost part, and guided to the copying means to the second reading position. In a double-sided copying apparatus for obtaining a double-sided copy from a double-sided original, including the take-out means for copying the original document image on the other surface of the recording paper. Take out from the other Is configured to detect paper jams in recording paper or originals, and in response to the detection output of the detection means, after the paper jam is cleared, the original corresponding to the paper jam from the original storage means is detected. 1 The document image is presented at the reading position, the original image is copied onto the recording paper from the paper feeding means by the copying means, and is stored in either the uppermost or lowermost one of the intermediate storing means, and the stored recording paper. 2. A double-sided copying apparatus, comprising: a control unit that causes a copying unit to copy a document image taken out by a take-out unit and presented at a second reading position of the document corresponding to the paper jam.