JPH01292363A - Copying machine - Google Patents

Abstract

PURPOSE:To align punch holes on a paper discharge tray regardless of whether a one-side copy or both-side copy is taken and to enable the use of a finisher by providing a form top-reverse inverting means on the form feed passage between a form feed part and a transfer part. CONSTITUTION:A photosensitive material layer is provided on the surface of a photosensitive drum 1. This photosensitive material layer is charge electrostatically and uniformly by passing an eraser lamp 2 and an electrostatic charger 3 and exposed to an image from a scanning optical system 10 through a slit part 5 to have an electrostatic image formed on its surface. An image-end and inter-image eraser 4 has light emitting diodes arrayed in the image width direction and removes unnecessary charges on the surface of the drum 1. Then the front end part of a form being moved is carried to the left side on the T-shaped form passage part extending between a roller couple 4 and a switching claw 41 and then the rear end part of the form is guided as the front end part to a transfer part 7 from the right side. When a both-side copy is taken and a 1st side (2nd page of a document) is copied, inverting operation before the form is sent to the transfer part is only added.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a copying machine, and more specifically, the present invention relates to a copying machine, and more specifically, each optical image obtained by optically sequentially scanning a plurality of originals is guided to a photoreceptor and developed. This invention relates to a copying machine that has an automatic duplex copying function that sequentially forms each image on both sides of a sheet of paper and discharges the image, and in particular relates to improvements to the paper feeding unit when using pre-punched paper (pre-punched paper) for filing purposes. .

[Prior art] In general, in a copying machine equipped with a double-sided copying function, the front and back sides of the copy paper are reversed after one-sided copying is completed, so the number of copies ejected onto the tray differs between one-sided copying and double-sided copying. The front and back edges of the paper are swapped. For this reason, if a finisher for automatically stabilizing the ejected copy paper is installed on the copying machine and you try to stabilize the copy paper, the finisher will automatically stabilize the copy paper when making one-sided copies and when making two-sided copies. It is necessary for the operator to consider the orientation of the document and set it so that the images have the same positional relationship, which requires a very complicated operation. Furthermore, when using pre-punched paper as copy paper, the punch holes give direction to the copy paper, so the punch hole position relative to the finisher is
It is necessary to load the copy paper with the front and back ends of the copy paper reversed so that both one-sided copying and double-sided copying are the same.

[Problems to be Solved by the Invention] In order to solve the above-mentioned problems, it has been considered to use two paper feed sections and set the printed sheets in different directions.

However, there are many copying machines that have only two or three paper feed stages, and the use of two paper feed sections therefore causes other problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a copying machine in which the position of punch holes does not change between single-sided copying and double-sided copying even when printed sheet paper is used, and the above-mentioned disadvantages do not occur. It is.

[Means for Solving the Problems] The above-mentioned purpose is to optically scan a plurality of originals sequentially, guide each optical image obtained to a photoreceptor, develop it, and sequentially print each optical image on both sides of each sheet of paper. In a copying machine that has an automatic double-sided copying function that forms and discharges the paper, the front and back edges of the paper are selectively reversed in the paper transport direction in the paper path between the paper feed section and the transfer section. This can be achieved by providing a means for reversing the front and back sides of the paper.

[Operation] After the leading edge of the paper that is moving in the T-shaped paper passing path section between the pair of rollers 42 and the switching die 41 shown in FIG. It is guided to the transfer section 7 from the right side.

Note that with respect to the intermediate tray used when performing double-sided copying or composite copying, the front and rear ends of the paper are reversed at the intermediate tray delivery point from the image transfer section, and such reversing means are already known.

An illustrated example of detailed operation is as follows.

FIGS. 5 to 8 show an example of copying using printed paper, and the copying machine system shown in FIG. 1, which sequentially copies from the last page of the original, is used.

When performing single-sided copying, the pre-punched paper set in the paper feed tray in FIG.
It is discharged onto 03. In this case, the setting direction of the printed sheet paper set on the paper feed tray is determined by the stable position of the finisher. - In terms of transport, many documents are configured to be bound at the top left of the document.

However, when copying the screen, the first page (
When copying the second page of the original, if it is sent to the transfer unit in the same way as one-sided copying, the punched holes will be reversed after copying the second side (the first page of the original).

In order to solve this problem, the pre-punched paper may be set in two paper feed sections so that the hole positions are different from each other, but this will crush one of the paper feed sections. Furthermore, if the pages are reversed after transfer and the punch hole positions are aligned, the page order will not match.

Therefore, when copying the first side (second page of the original) in double-sided copying, it is possible to add a reversing operation before sending the document to the transfer section. FIG. 7 is a diagram when copying is performed using this method, and the punch hole positions and page order are aligned on the paper output tray 603.

In the case of composite copying, as shown in FIG. 8, the first side (page 2) may be copied in the same way as in single-sided copying.

[Example] A preferred embodiment of the invention will be explained based on the drawings.

The main parts of the embodiment are shown in FIG. 1 and FIGS. 11 to 16.

FIG. 1 is a longitudinal sectional view showing an example of a copying machine to which the present invention is applied.

A photosensitive drum 1 is rotatably supported approximately in the center of the copying machine main body 100 in the direction of arrow a in the figure, and around it are an eraser lamp 2, a charger 3, an end-to-image tracer 4, A developing device 6, a transfer charger 7, a separation charger 8, and a cleaning device 9 are arranged in this order.

The photoreceptor drum 1 has a photoreceptor layer provided on its surface, and this photoreceptor layer is uniformly charged by passing through the eraser lamp 2 and the charging charger 3, and is charged by the scanning optical system 1.
0 through the slit section 5, and an electrostatic latent image is formed on its surface. Said end, image eraser 4
has a plurality of light emitting diodes arranged in the image width direction, and removes unnecessary charges from the surface of the photoreceptor drum 1 during image formation.

The optical system 10 is installed below the document platen glass 16 so as to be able to scan the document image, and includes an exposure lamp 17, movable mirrors 11, 12, 13, a lens 14, and a mirror 15. The exposure lamp 17 and the movable mirror 1
1 moves integrally in the direction indicated by the arrow at a speed of V/m (where m: copying magnification) with respect to the circumferential speed V of the photosensitive drum 1 (constant regardless of whether the magnification is the same or variable magnification). , movable mirror 12.
13 are driven by a scan motor (not shown) so as to move integrally in the direction indicated by the arrow at a speed of 772 m.
When changing the copying magnification, the stepping motor moves the lens 14 on the optical axis and the mirror 1
5 is moved and oscillated to correct the optical path, but such a magnification changing mechanism is already known in principle.

Furthermore, regarding Mfllll with respect to the scanning speed of the optical system 10, control is performed to change the rotational speed of the scan motor according to the copy magnification data, but a detailed explanation of the control method and the like will be omitted.

The copy paper is fed into the machine by an automatic paper feed mechanism 20 provided at the lower part of the copying machine main body 100 in the figure and having two upper and lower copy paper storage sections, or by a manual paper feed mechanism 30 provided above the automatic paper feed mechanism 20. After being temporarily stopped by the timing roller pair 21, the toner image is sent to the transfer section in synchronization with the image formed on the surface of the photosensitive drum 1, the toner image is transferred by the transfer charger 7, and the toner image is transferred to the photosensitive drum by the separation charger 8. The body drum 1 is separated from the surface of the fixing device 2 by a conveyor belt 22.
3, the image is fixed, and the sheet is sent to the finisher 600 side by the upper surface of the switching die 35 and the ejection roller pair 36. After the transfer, the photosensitive drum 1 is cleaned of residual toner and electric charge by a cleaning device 9 and an eraser 2, and is ready for the next copying process.

Either the automatic paper feed mechanism 20 or the manual paper feed mechanism 30 is selectively used. For automatic paper feeding, copy machine 1
Print key 71 (
The image forming system including the photoreceptor drum 1 is started by the operation (see FIG. 2), and when the pre-driving process for the photoreceptor drum 1 is completed, the paper feed roller 25 or 26 is driven.
Drive of the optical system 10 is started by a scan start signal output as the copy paper is transported, and the copy paper is fed in synchronization with the image forming operation. 2.3 sheets of copy paper are pushed out by the rotation of paper feed rollers 25 or 26, and only the topmost sheet is sent out by a separating mechanism 27 at the next stage.

In the sorting mechanism 27, upper rollers 27a and 27c are rotated in the feeding direction, and lower rollers 27b and 27d are rotated in the pushing direction, in the directions of the arrows shown in the figure. The second and subsequent sheets of copy paper that are pushed out together with the top layer of copy paper by the paper feed roller 25 or 26 are transferred to the lower rollers 27b and 2.
7d, and only the uppermost layer of copy paper is sent out toward the next pair of intermediate rollers 28a, 28b, and 28c. The intermediate roller pairs 28a, 28b, and 28c are associated with the timing roller pair 21 at the next stage, and their driving is controlled by a method described later.

On the other hand, in the case of manual paper feeding, when a copy paper is inserted from the manual paper insertion slot and a sensor (not shown) detects this, the manual paper feed roller 33 rotates and feeds the copy paper into the machine. At the same time or with a slight delay, the driving of the photosensitive drum 1 and the like starts in the same manner as when the print key 71 is operated.

Then, the manually fed copy paper is detected by the copy paper leading edge detection sensor S.
It is temporarily stopped at the detection part of E2 and waits, and the photoreceptor drum 1
When the pre-driving process including the rotation of the sheet is completed, the sheet feeding roller 33 rotates again, thereby feeding the sheet into the machine.

The copy paper storage section (hereinafter referred to as paper feed tray) of the automatic paper feed mechanism 20 is provided with a regulation plate that regulates the rear edge and width, and is configured to be movable depending on the size of the copy paper to be accommodated, and can be adjusted to an appropriate size. The size of the copy paper can be determined by a plurality of correspondingly arranged sensors. Note that a sensor SET is provided below the copy paper placement surface of the upper paper feed tray 91 at a position corresponding to the punch hole portion when prevent paper is set.

The operation when performing double-sided copying is different from that during single-sided copying described above, from paper feeding to timing roller pair 21.

The paper conveyed upward from either the upper paper feed tray 91 or the lower paper feed tray 92 is once sent to the left side as the switching pressure 41 is rotated counterclockwise by a solenoid (not shown). Next, a pair of rollers 42, which are connected by a latch so that they can be rotated forward or backward, are rotated so as to send the paper to the left, so that the paper is sent further to the left. After the trailing edge of the copy paper is detected by the sensor SE6 and reaches the vicinity of the nip between the pair of rollers 42, the pair of rollers 42 is driven in the reverse direction, and is fed in the upper right direction until it reaches the pair of timing rollers 21. The same processing as when copying is performed.

The copy paper copied on the side 4 is fixed by a pair of fixing rollers 23,
The switching pressure 35 is sent downward through a pair of rollers 43 by being rotated clockwise by a solenoid (not shown).
It is U-turned twice by the roller pairs 37a, 37b, 37c, and 37d, and is housed in the intermediate tray 40 with the image surface facing upward.

A paper feed belt 39 supported by a boot IJ 38 is provided on the lower left side of the intermediate tray 40, and the copy sheets are fed one by one starting from the lowest copy paper. On the left side is the paper feed mechanism 20
Similarly to the above, an upper roller 27e1 and a lower roller 27f of the sorting mechanism 27 are provided.

The paper sent out from the intermediate tray 40 for copying on the back side is sent upward when the switching pressure 41 returns to the solid line position, and is copied in the same manner as in single-sided copying, and the switching pressure 35 returns to the solid line position. Finisher 60 by
Sent to the 0 side.

Furthermore, when performing composite copying, the operations from paper feeding and refeeding to the timing roller pair 21 are different from those during double-sided copying. Copy paper fed from either of the paper feed trays 91 or 92 is copied onto one side as in the case of single-sided copying, and by rotating the switching pressure 35 clockwise, the image side is transferred into the intermediate tray 40. It is stored in an upward position.

The copy paper sent out to copy another image on the image surface again is once sent to the left by rotating the switching pressure 41 counterclockwise, and the pair of rollers 42 feed it to the left. By rotating, it is sent further to the left.

When the trailing edge of the copy paper is detected by the sensor SE4 and reaches the vicinity of the nip between the roller pair 42, the roller pair 42 is reversed to feed the copy paper in the upper right direction, and the post-copy switching die 35 returns to the solid line position. , and sent to the finisher 600 side.

The ADF 200 generally includes a document tray 201, a paper feed belt 202, a pair of paper feed rollers 203, and a reversing guide slope 204.
, a conveyor belt 205, a reversing roller 206, and a pair of discharge rollers 207.

The ADF 200 circulates and conveys originals sequentially starting from the last page, and the originals are placed in the tray 20 with the back side of the last page facing down.
The paper feed belt 20 is placed on the paper feed belt 20 starting from the last page.
The sheet is pulled out by the second rotation, and is sent between the conveyor belt 205 and the document table glass 16 from the sheet feed roller pair 203 via the reversing guide plate 204 . Next, the conveyor belt 20
5, the document is set at a predetermined position on the document table glass 16, and is irradiated with light by the optical system 10. After the image exposure, the original is transported from above the original glass 16 to the right by a transport bell (205), and transferred to a pair of ejection rollers 20 via a reversing roller 206.
7, the document is discharged onto the document placed on the tray 201 with the image side facing up.

The finisher 600 includes a paper output tray 603 on which copy sheets sent from the copying machine 100 are stacked as is, and an ADF.
When the stapling mode is selected in which the 200 continuously makes one copy per original and stabilizes when one set of copies is completed to bind a predetermined number of copies (see Figure 2). (selected by operating the key 85 in ) is roughly composed of a stable tray 605 for once stacking each copy, and a stacker 610 for stacking the stabilized copy sheets.

If not bound, the copy paper is rolled by roller pair 601.60.
2 on the paper discharge tray 603. When the stable mode is selected, the switching claw 609 rotates clockwise, the copy paper is fed downward, and the stable tray 609 is rotated clockwise.
It is accommodated in 05.

The copy paper is conveyed downward while moving toward the front side by a paddle wheel that rotates while tilting slightly toward the front side with respect to the direction of travel, and is positioned at the front corner by regulating the lower end with a stopper 608. . An electronic stapler 607 is provided at that position, and after copy sheets corresponding to the number of original documents are accommodated and positioned, the electronic stapler 607 is driven and stapled. Then stopper 6
08 is retracted in a substantially horizontal direction, the bound copy sheets slide into the stacker 610 and are stored and stacked.

FIG. 2 is an exemplary top view of the operation panel.

The operation panel 70 is installed on the upper front part of the copying machine main body 100, and includes a print key 71 for starting a copying operation,
Interrupt key 72 for temporarily interrupting the multi-copy operation, clear/stop key 73 for stopping the copy operation or canceling the set number, numeric keypad 74 for setting the number of multi-copy sheets, the number of copies and the status of the copying machine. A display section 75 for displaying , an up/down key 76 for setting copy density, a paper selection key 77 for selecting copy paper size, and a paper size display section for displaying the selected copy paper size. 78, magnification selection key 79 for selecting the copy magnification, magnification display section 80 for displaying the selected magnification, duplex key 81 for selecting duplex copying, duplex display for displaying the selection status. Part 8
2. A composite key 83 for selecting a composite copy, a composite display section 84 for displaying the selection status, and a finisher 600
a stable key 85 for selecting a stapling mode for automatically binding copies, a stable display section 86 for displaying the selected state, and a pre-punch key for displaying that the selected copy paper is pre-punched paper. It consists of a paper display section 87.

FIGS. 3 and 4 are circuit diagrams of the control section.

FIG. 3 shows a control circuit of the copying machine, in which CPU1 is a first microcomputer for controlling the operation of the copying machine main body 100, and CPU2 is a second microcomputer for controlling the optical system 10.

303 is a switch matrix equipped with a display section 75;
04 is a decoder. In addition, output terminal AI or A
12, a main motor of the copying machine book 100, a developing motor of the developing device 6, a timing roller clutch of the timing roller 21, a first paper feed clutch of the paper feed roller 25, and
Second paper feed clutch of paper feed roller 26, charger 2
, a transfer charger 7, a roller normal rotation clutch for transmitting leftward conveyance of the roller 42, a roller reverse clutch for transmitting rightward conveyance of the roller 42, and rollers 28a and 28b.

Drive switching transistors (not shown) for the intermediate roller clutch 28c, the solenoid 1 that rotates the switching type 41 counterclockwise from the solid line position, and the solenoid 2 that rotates the switching type 55 clockwise from the solid line position is connected. CPU3 is a third computer for controlling the operation of the ADF 200, and CPU4 is a fourth computer for controlling the operation of the finisher 600.

9 to 16 are flowcharts showing examples of control of the copying machine 1000.

FIG. 9 shows the main routine. When the power is turned on, initial settings are performed in step S1, and flags, timers, etc. are reset. In step S2, an internal timer is started to keep the time for one cycle of the main routine constant. In step S3, a copy condition setting routine for selecting a copy mode is performed, in step S4, a copy operation routine for executing copying is performed, and in step S5, communication processing with CPU2, CPU3, and CPU4 is performed. In step S6, the process waits for the internal timer set in step S2 to end, and then returns to step S2.

FIG. 10 shows a copy condition setting routine for selecting each mode of double-sided copying and composite copying shown in step S3 of FIG. 9.

In the following, F means a flag.

In step S4, start F=rlJ is set while the copying machine system is operating, and F=rOJ is set when the copying machine system is not operating. Also, both sides F = rlJ
is set when double-sided copying is selected, "0" is set when it is not, furthermore, "Composition F=r1" is set when composition copy is selected, and "0" is set when it is not.

In the routine of the copy condition setting example shown in FIG. 10, it is determined in step 5301 whether the start flag is "0", and if not, the process returns, and if so, it is determined in step 5302 whether or not the double-sided key 810 is on-edge. If so, the process advances to step 5303; otherwise, the process advances to step 8306. In step 5303, it is determined whether the double-sided flag is "0", and if so, in step 5304, the double-sided flag is set to "1" and the composite flag is reset to rOJ; otherwise, in step 5305, the double-sided flag is set to "1", and the composite flag is reset to rOJ. Reset to "0".

In step 8306, it is determined whether or not the composite key 83 is on edge, and if not, the process returns. If so, in step 5307, it is determined whether the composite flag is "0", and if so, in step 8308, the composite flag is Set to "1" and reset the same side flag to O,
Otherwise, set the composition flag to "0" in step 5309.
Reset and return.

11 to 15 show the copy operation routine shown in step S4 in FIG. 9.

First, regarding FIG. 11, when the on-edge of the print key 71 is detected in step 5401, step 540
When it is confirmed in step 2 that the start flag is "0", the start flag is set to "1" in step 5403.

If the on-edge of the print key 71 is not detected in step 5401, the process advances to step 5404, and an original exchange signal (issued from the CPU 3 each time a copied original is ejected by the ADF 200 and the next original is set on the platen 16). It is determined whether or not is "1", and if so, the start flag is set to "1" in step 5405 and the process proceeds to step 8408; otherwise, the process proceeds to step 5407. Also, if the start flag is determined to be "1" in step 5402, step 5407
Proceed to.

If the start flag is determined to be "1" in step 5407, the process advances to step 8408, and if the determination is "NO", the process returns.

In step 5408, the ISt flag (flag indicating that this is the first copy of double-sided copying or composite copying)
If is not "0", proceed to step 5412, and if it is "0", confirm in step 5409 that the 2nd flag (flag indicating that this is the second copy of double-sided copying or composite copying) is "0". Then, in step 5410, the 1st flag is set to "1". Step 540
If the determination in step 9 is "NO", it is determined in step 5411 whether the duplex flag (set when the duplex copy mode is selected) is "1", and if so, step 3450 ( FtgSd), otherwise proceed to step 5460.

If it is determined in step 5412 that the double-sided flag is not "1", it is determined in step 5415 whether the composite flag is "1", and if so, the process proceeds to step 3470 (FIG. 14); otherwise, step 3480 ( Figure 14)
Proceed to.

If the duplex flag is "1" in step 5412, it is determined in step 5413 whether the paper feed flag (set during execution of one cycle of paper feeding) is "0", and if not, the process advances to step 3418; If so, step 54
14, set the paper feed flag to "1", and turn the main motor,
Developing motor, electrification charger, transfer charger, exposure lamp, solenoid SLI (for switching type 41 drive), solenoid SL2 (for switching type 35 drive), roller reversing clutch (rotation direction clutch that feeds the paper leftward)
, and turn on the intermediate roller clutch (clutch of roller 28). Note that steps 5413 and subsequent steps are executed when the first duplex copying is in progress.

Regarding FIG. 12, if the first paper feed tray 91 (referred to as J21 lower A paper feed) is selected in step 5416, the A paper feed clutch is turned on, and if not, the B paper feed clutch is turned on. In step 3418, it is determined again whether A paper feed is selected, and if so, in step 5419, it is determined whether sensor SEI is on edge, and if not, in step 5421, it is determined whether sensor SE5 is on edge, and if rYESJ, then A paper feed clutch is selected. , B paper feed clutches are turned off, and if r N OJ, the process advances to step 5422. At step 5422 sensor 5EL
If the off edge of No. 6 is detected, timer B (set to the time when the trailing edge of the paper reaches the nip portion of the roller 42) is started, and if not, step 5 is started.
Proceed to 424.

When it is determined in step 5424 that timer B has ended, in step 5425 the roller reverse rotation clutch is turned off, the roller forward rotation clutches (clutches for conveying paper in the right direction) are turned on, and timer B is reset. Otherwise, the process advances to step 8426. Step 5426
When the on-edge of sensor SE2 is detected, a timer C is set to hit the leading edge of the paper against the stopped timing roller to form a loop (to prevent diagonal feeding), and if not, go to step 5428. move on.
When it is confirmed in step 5428 that the timer 0 has ended, in step 5429 the roller normal rotation clutch and the intermediate roller clutch are respectively turned off and the timer C is reset.
In step 5430, when it is confirmed that the timing signal has been issued from the CPU 2, the timing roller clutch
The intermediate roller clutch and the roller normal rotation clutch are each turned on, and a timer D is set to the time when the trailing edge of the paper passes through the intermediate roller. If not, step 54
Proceed to 32. In step 5432, it is determined whether the timer D has ended, and if so, in step 5433, the roller normal rotation clutch and the intermediate roller clutch are turned off and timer 0 is reset; otherwise, the process proceeds to step 5434.

Regarding FIG. 13, in step 5434, when the set number of multi-copy end signals issued from the CPU 2 are turned on, the developing motor and transfer charger are turned off in step 5435, and if not, in step 5436, the paper feed flag is set to rOJ. and return. In step 5437, off-edge of sensor SE3 is detected, and if so, in step 8438, the 1st flag is set to "1", and in step 54
When the double-sided flag is "0" in Step 39 and the composite flag is "0" in Step 5440, the 1st flag is reset to "0" in Step 5441 (this indicates the case of single-sided copying). If it is determined in step 5438 that the ISt flag is not "1", solenoid 1 is turned off in step 5444, the 2nd flag is set to "0", and the process proceeds to step 5442 (at the time of the second copy of screen copy or composite copy). ). If rNOJ is determined in step 5439 or step 5440, step 54
At step 43, the solenoid 11 and solenoid 2 are turned off, the 1st flag is reset to "0", and the 2nd flag is set to "1" (indicating the case of the first duplex copy or composite copy). In step 5442, the paper feed flag and start flag are each reset to "0", and a timer E for turning off the main motor is started. In step 5445, it is determined whether timer E has ended, and if so, in step 8446 the main motor is turned off, timer E is reset, and the process returns; otherwise, it returns directly.

The routine after step 5450 shown in FIG. 14 shows the paper feeding operation during the second screen copy. In step 5450, it is determined whether the paper feed flag is "0", and if not, the process proceeds to step 5452; if so, the process proceeds to step 5451, where the paper feed flag is set to "1", and the main motor, developing motor, Turn on the charging charger, transfer charger, exposure lamp, intermediate roller clutch, and paper refeed clutch. In step 5452, it is determined whether the sensor SE4 is on-edge, and if so, the paper refeed clutch is turned off in step 5453, and if not, the process directly returns to step 5426 in FIG.

The routine after step 8460 uses the second copy of the synthetic copy.
The paper feeding operation during the first copying is shown. If it is determined in step 5460 that the paper feed flag is “0”, step 3
Set the paper feed flag to "1" in step 461, turn on the main motor, developing motor, charging charger, transfer charger, exposure lamp, intermediate roller clutch, paper refeed clutch, roller reversing clutch, and solenoid L, respectively. If not, the process advances to step 5462. Step 846
If the ON edge of sensor SE4 is detected in step 2, the paper refeeding clutch is turned off in step 8463, and if not, the process proceeds to step 8464.

If the off-edge of sensor SE4 is detected in step 5464, a timer 〇 (set to the time until the trailing edge of the paper reaches the vicinity of the nip portion of the roller 42) is set in step 5465, and if not, step 546
Proceed to step 6. If it is determined in step 8466 that the timer G has ended, the roller reverse clutch is turned off, the roller forward rotation clutch is turned on, and the timer G is reset in step 8467, and if not, directly step 84 in FIG.
Return to 26.

The routine after step 5470 in FIG. 15 shows the paper feeding operation during the first copying in composite copying. In step 5470, it is determined that the paper feed flag is "0",
If not, go to step 5475. If so, go to step 5471 to set the paper feed flag to "1" and turn on each of the main motor, developing motor, charger, transfer charger, exposure lamp, intermediate roller clutch, and solenoid 2. let In step 5472, it is determined whether or not paper feed A is selected. If so, the paper feed clutch A is turned on in step 5473, and if not, the paper feed clutch B is turned on in step 5474.

In step 5475, it is determined again whether the A paper feed is being selected, and if so, in step 3476, the sensor S
EI, otherwise in step 5478 sensor S
Determine whether E5 is on-edge. If rYEsJ is determined in either step 5476 or step 5478, the A paper feed clutch and B paper feed clutch are turned off in step 5477, and if "NO" in either step, the process directly proceeds to step 8426 in FIG. move on.

The routine after step 5480 in FIG. 16 shows the paper feeding operation during one-sided copying. In step 8480, it is determined whether or not the paper feed flag is "0". If not, the process proceeds to step 5485. If so, in step 5481, the paper feed flag is set to "1", and the main motor, developing motor, Turn on the charging charger, transfer charger, and intermediate roller clutch. In step 3482, A
It is determined whether or not the paper feed is being selected. If so, the A paper feed clutch is turned on in step 8483, and if not, the B paper feed clutch is turned on in step 8484.
In step 5485, it is determined again whether the A paper feed is being selected, and if so, in step 8486, the sensor S
E1, otherwise in step 5488 sensor 3
Determine whether E5 is on-edge. In step 8486, the on-edge of sensor SE1 is determined, and in step 3488, the on-edge of sensor SE5 is determined, and either rY
If EsJ, the A paper feed clutch and the B paper feed clutch are turned off in step 8487, and if "No" in both cases, the process directly proceeds to step 3426 in FIG.

Each of the single-sided copy, double-sided copy, and composite copy modes shown in FIGS. 5, 7, and 8, respectively! In the third example, holes are punched on the front end side of the paper with respect to the paper feeding direction, but for paper with punch holes punched on the rear end side with respect to the paper feeding direction, Fig. 17, Figure 18 and 1
The various aspects of control shown in FIG. 9 can also be implemented by referring to the processing examples shown in FIGS. 9 to 16, although they are not particularly shown in flowcharts. In this case, although not shown, a sensor similar to the sensor SET in Fig. 1 is placed on the rear end side, and a punch hole is detected selectively from the front and rear ends, and the QIIM control is automatically selected accordingly. be done.

FIG. 17 shows the case of single-sided copying, in which the front and rear ends of the vapor are converted before reaching the transfer section, and the vapor is guided directly to the paper discharge tray.

Figure 18 shows the case of same-sided copying, where the first side of the copy (original 2
The front and back of the paper is not converted while it is being conveyed to the transfer unit, but the front and back of the paper is converted while it is stored in the intermediate tray, and the second side (first page of the same page) is executed, and then the paper is ejected. loaded onto a tray.

FIG. 19 shows the case of composite copying, in which the first side is copied in the same way as single-sided copying, the paper is stored in the intermediate tray, and before the second side is copied, the front and back are converted and copied, and the paper is placed in the output tray. be accommodated in.

(g) Effect: Pre-punched paper can be used, the punch holes are aligned on the paper output tray whether one-sided copying or two-sided copying is performed, the position of the binding margin remains unchanged, and a finisher or automatic stapler can be used.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a copying machine to which the present invention is applied, FIG. 2 is a top view of the operation panel, FIGS. 3 and 4 are illustrations of the control section, and FIGS. 5 to 8 are FIG. 9 is an example of the main routine of the control unit; FIG. 1O is a flowchart of an example of setting copy conditions;
1 to 16 are flowcharts of examples of copying operations, and FIGS. 17 to 19 are diagrams illustrating the movement of sheets with punch holes at the rear end. 1 is photosensitive paper, 6 is a developing section, 7 is a transfer section, 10 is an optical system,
20 is a paper feed unit, 35 and 41 are switching claws, 40 is an intermediate tray, 42 is a pair of rollers, 200 is an ADF (automatic document feeder)
, 600 is a finisher. (Full 5 drawings 61 ℃ 1; Stay 71 tray) Small 13 Drawing 141z

Claims (1)

[Claims] 1. A copying machine that has an automatic double-sided copying function that sequentially scans multiple originals optically, guides and develops each optical image obtained on a photoreceptor, and sequentially forms each image on both sides of each sheet of paper before ejecting it. In the paper feeding section, there is provided a sheet reversing means for selectively reversing the front and back ends of the sheet in the conveying direction in the sheet passing path section between the sheet feeding section and the transfer section, and a sheet reversing means for reversing the front and back edges of the sheet in the conveying direction; On the other hand, for sheets with punch holes on the front edge side, when making single-sided copies, the front and rear ends of the paper are left as they are, and when making double-sided copies, the front and rear ends of the paper are converted using the reversing means for copying the first side and via the intermediate tray for copying the second side, respectively. For sheets with punch holes on the trailing edge with respect to the paper feeding direction, the reversing means is used when making single-sided copies, and when making double-sided copies, the first side is copied as is, and the second side is copied via an intermediate tray to move the front and back of the paper, respectively. 1. A copying machine, comprising: a control means adapted to convert an edge.