JPH01198765A - Imprinting device for marks around sheet in copying machine - Google Patents

Abstract

PURPOSE:To prevent wasteful imprinting by imprinting marks on only one side when a double-side copying mode and a mark imprinting mode are selected. CONSTITUTION:When a selecting means 68 selects the double-side copying mode, a means forming a copying image of an original on a copying sheet is operated to form said image on both sides of one copying sheet. At that time, when a means 67 selecting the peripheral mark imprinting mode is operated, a control means 81 controls the imprinting means 81 so that it can be operated only when an image is formed on either of both sides. Thereby, peripheral marks can be imprinted on one specific side of a copying sheet as well as images of the original formed on both sides. Thus, peripheral marks can be formed on only one side of a transfer sheet having images on its both sides, thereby preventing wasteful imprinting.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a peripheral mark 5-incorporating device for imprinting peripheral marks such as punch reference images and index images used around the periphery of a sheet in a copying machine. It is used to form peripheral marks such as punch reference images and index images on copies, and to provide a reference when punching holes for files, or to display for indexing and sorting. be done.

(Prior art) As this type of peripheral mark 5-incorporating device, the conventional
2. Description of the Related Art A punch reference image transfer device described in Japanese Patent No. 19938 is known.

In this method, a punch reference image is imprinted on one side of a copy obtained using a normal copying process, and it is possible to provide a positional reference when punching holes without the need for a special copying process. So flight.

It is advantageous.

(Problems to be Solved by the Invention) - The applicant has also developed a peripheral mark imprinting device that forms an index image around a copy sheet and uses it as an index for the copies or as an indication for sorting. I am proposing it first.

By the way, these conventional or previously proposed peripheral mark imprinting devices only refer to the case of copying on one side of a copy sheet. If this was simply applied to copying in the double-sided copying mode that has become popular in recent years, peripheral marks would be imprinted on opposite sides of both the front and back of the copy sheet. Particularly in the case of punch reference lines, since the binding side is a specific side, the marks on the side that is not the binding side are wastefully formed and become unwieldy and unsightly. In addition, in the case of index images, for sorting, etc., it is possible to select and use either one on both the front and back sides as a guide, but it is sufficient to use one separately, and it is also large enough to be easily noticeable as an index mark image. Because of the formation, the excess formation also becomes an eyesore. Furthermore, when the copy sheet is bound, the index image is also present on the binding side that cannot be opened, making it confusing. Furthermore, toner is wasted.

Therefore, the present invention provides a method for printing sheets in a copying machine that can solve the above-mentioned problems by allowing marks to be printed only on either side when both the double-sided copying mode and the mark imprinting mode are selected. The object of the present invention is to provide a peripheral mark imprinting device.

(Means for Solving the Problems) In order to achieve the above objects, the present invention provides a mark imprinting means for imprinting a peripheral mark such as a punch reference image or an index image on the periphery of a copy sheet; means for selecting an imprint mode for imprinting marks; means for forming images on both sides of a copy sheet; means for selecting a duplex copy mode; and both duplex copy mode and mark imprint mode selected. The present invention is characterized in that it includes a control means for operating the mark imprinting means only during one of front side copying and back side copying.

(Function) When the double-sided copy mode is selected by the selection means, the means for forming a copy image of the original on the copy sheet is operated, and images of the original are formed on both the front and back sides of one copy sheet.

At this time, if the means for selecting the peripheral mark imprinting mode is operated, the mark imprinting means is activated only when image formation is performed on either the front or the back side by the function of the control means, In addition to forming an image corresponding to the original, it is possible to imprint a peripheral mark on a specific side of the copy sheet. Therefore, the peripheral mark is formed only on one side of the copy sheet that has been copied on both sides, and unnecessary imprinting can be prevented.

(Embodiment) An embodiment will be described in which the present invention is applied to a centering type electrophotographic copying machine as shown in FIG. 1, and the punch reference line is imprinted as a peripheral mark.

This electrophotographic copying machine is provided with a photosensitive drum 2 that is driven counterclockwise at approximately the center of a machine body 1. As shown in FIG.

Around the photoconductor drum 2, there is a main eraser lamp 3,
A main charger 4, a developing device 5, a transfer charger 6, a separation charger 8 for the copy sheet 7, a cleaning device 9, etc. are arranged in order in a counterclockwise direction.

The photoreceptor drum 2 has a photoreceptor layer provided on its surface, and this photoreceptor layer is charged by passing through the main eraser lamp 3 and the main charger 4, and the photoreceptor layer is charged by passing through the main eraser lamp 3 and the main charger 4. The image is exposed by an exposure optical system 11 provided below. The exposure optical system 11 includes a light source 12, movable mirrors 13, 14, 15, a projection lens 16, and a mirror 17. The light source 12 and the movable mirror 13 move to the left at a speed of (V/n) (where n: copying magnification □ ratio) with respect to the circumferential speed (V) of the photosensitive drum 20 (constant regardless of the magnification or variable magnification). Move the movable mirror 14.1
5 moves to the left at a speed of (V/2n), DC
The scanner is driven by a motor to scan the original image on the original platen glass 10 and expose the photosensitive drum 2 to slit light. When changing the copy magnification, use the stamping motor M2.
As a result, the projection lens 16 moves on the optical axis, and the mirror 17 moves or swings. M3 is the main motor, and the old one is the developing motor.

Paper feed units 20 and 21 each having paper feed rollers 18 and 19 are installed at the bottom of the machine body 1, and the copy sheet 7 is transferred to a transfer unit between the photoreceptor drum 2 and each transfer/separation charger 6.8. It is set to feed paper. An intermediate tray 26 for double-sided copying and composite copying, a manual paper feeding section 22, etc. are also provided above the paper feeding section 20.21. Further, a pair of register rollers 23 is provided immediately before the transfer section to determine the paper feeding timing. On the other hand, behind the transfer section, there are provided a conveyor belt 24, a fixing device 25, and a pair of discharge rollers 30, which receive the toner image transferred from the photoreceptor drum 2 and convey the separated copy sheet 7. After the sheet 7 is subjected to a fixing process by a fixing device 25, it is discharged to a paper discharge tray 31 outside the machine body 1 via a pair of discharge rollers 30.

Further, an inter-image eraser unit 32 is provided at a position around the photosensitive drum 2 and between the exposure section and the charger 4. When operated, the inter-image eraser unit 32 removes the charge received by the charger 4 on the photoreceptor drum 2, and prevents formation and development of an electrostatic latent image in the removed portion. This is commonly used to prevent image formation between images formed on the photoreceptor drum 2.

This inter-image eraser unit 32, as shown in FIG.
A large number of light emitting diodes (hereinafter referred to as LEDs) 32a are arranged in the axial direction of the photoreceptor drum 2, and by controlling the operation timing and which of the LEDs 32a is emitted during operation, static electricity is generated on the photoreceptor drum 2. Image formation can be blocked anywhere in the normal image area where latent image formation and development occurs.

As shown in FIGS. 1 and 3, a document scale 41 is provided on one side of the document placement glass 1o on the top surface of the device 1. As shown in FIGS. This manuscript scale 41 has a center reference scale that matches the aircraft 1, which is a center alignment method, and has
The Tagawa scale 41a, which mainly uses the B series, is provided as an example.

On the back of the original scale 41, as shown in FIGS. 3 and 4, a punch reference line 42 is provided at the center position common to each original size, and only the original whose edge is in contact with the old original scale is copied. It is not copied using normal copying. Therefore, in order to copy the punch reference line 42, only when the punch reference line feed mode is selected, by changing the paper feeding timing by the register roller pair 23, the copy image area is changed to the original scale 4.
1 side so that the punch reference line 42 can be imprinted and copied as necessary.

Further, a switching pawl 27 is provided immediately before the pair of ejection rollers 30, and by switching the pawl 27, the copy sheet 7 to be ejected is sent to the conveying path 28a side toward the intermediate tray 26. The conveyance path 28a carries the received copy sheet 7.
are sent to the intermediate tray 26 through the sub-conveyance path 28b and stored face-up, or directly sent through the sub-conveyance path 28b to the intermediate tray 26 without using a bucket and stored face-down.

As a result, the copy sheet 7 after the surface copying is fed out from the intermediate tray 26 by the paper feed roller 44 in either a face-up state or a face-down state.
There is Mr. A. Due to the face-up feeding, the back side of the copy sheet on which no image is formed is subjected to the next image formation process, resulting in double-sided copying. Further, by feeding the copy sheet face-down, the surface on which the image has been formed is again subjected to transfer for the next image formation, resulting in a composite copy.

Furthermore, an automatic document feeder 45 and an automatic document reversal device 46 are installed on the body 1. Automatic document feeder 45
In the case of single-sided copying, the sheet original on the original tray 4o is sent out by a transport roller 47 and a pair of separating rollers 47a, and the sheet original is transported to a predetermined position on the original placing glass 10 by a transport belt 48, and is once stopped for exposure. , and is transported again and discharged onto the discharge tray 49. In double-sided copying, after being exposed to light on the document placement glass 10, the document is sent to the document reversing device 46 in order to copy the back side of the document next to the front side. Placement glass 1
The document is conveyed to a predetermined position on the document and once stopped, and the back side of the document is exposed. After this, the process is the same as in the case of single-sided copying.

As a result, double-sided copying, in which the front and back sides of a double-sided original are copied onto the front and back sides of a single copy sheet, is achieved by automatically handling the original. However, by storing the copy sheet 7 on which a single-sided original is copied on the front side in the -H intermediate tray 26 and feeding it so that it is copied on the back side when copying another single-sided original, the single-sided original is automatically sequentially copied. It is also possible to make double-sided copies.

An operation panel 51 as shown in FIGS. 3 and 5 is provided at the upper front of the aircraft body 1. As shown in FIGS. The operation panel 51 is the fifth
As shown in detail in the figure, it has a print key 52, and next to this print key 52 is a numeric keypad group 53 with keys 53° to 539 for setting the number of copies.
a clear/stop key 54 for clearing the number of copies to be made in a group or interrupting the copying operation midway;
An interrupt key 55 for interrupt copying is provided.

A display section 56 for displaying the number of copies, etc. is provided above the print key 52. Copy density adjustment keys 57 and 58 and a copy density display section 59 are provided beside the display section 56.
When key 7 is operated, the copy density becomes darker, and when key 58 is operated, the copy density becomes lighter.

A copy size switching key 60 and a copy size display section 61 are provided next to the numeric keypad group 53, and by operating the key 60, the currently used paper feed section is switched to the use state of another paper feed section and the display is displayed. In section 61, the copy size corresponding to the switched paper feed section is displayed.

Next to the copy size switching section are a selection key 62 for arbitrarily selecting a copy magnification, a specific magnification display section 63 that shows the copy magnification in relation to the original size and copy size, and a selection key 64 for selecting a specific magnification accordingly. .65.66 Furthermore, the operation display section 62a of each of those keys 62, 64, 65, 66,
64a, 65a, and 66a are provided, respectively.

Further, the punch reference line 42 is located near the specific magnification display section 63.
Select the mode of whether or not to take pictures.

A mark imprinting mode selection key 67 and a display section 67a for displaying the selection made by the key are provided. When the mark imprinting mode selection key 67 is operated, the normal mode is switched to the punch reference line imprinting mode, and when it is operated again, the mode returns to the normal mode.

Above the copy mode selection key 67, there is provided a double-sided copy mode selection key 68 and a display section 68a that displays that the selection has been made. The double-sided copy mode selection key 68 is used to switch from single-sided copy mode to double-sided copy mode by operating it, and to return to single-sided copy mode when operated again.

By the way, when copying the punch reference line 42,
If you do this each time you make a copy, then in the case of double-sided copying, copy sheet 7
0, the image of the punch reference line 42 is printed on the opposite side of the front and back sides.

In this case, the punch reference line printed on one side is wasted and becomes unwieldy and unsightly, and it becomes difficult to determine on which side the punch hole is to be punched. Furthermore, toner is wasted.

Therefore, in the present invention, when the mark imprinting mode is selected at the same time as the double-sided copying mode, the punch reference line 42 is controlled so that it is imprinted only when copying the back side. This solves the above problem. In addition, since the copy sheet is discharged with the last copied side facing up and the paper is output with the paper face up, the punch reference line 42 is imprinted on the back side facing upward when the copy sheet is discharged after copying the back side. This can be confirmed while the paper is being discharged onto the paper discharge tray 31.

The operations of the viper photographic machine described above are controlled by a microcomputer (hereinafter referred to as microcomputer) 81 shown in FIG. 6, to which the various operating means, operation section, display section, etc. are connected. In particular, the inter-image eraser unit 32
D 32a are arranged in 60 pieces at a pitch of 5M so that the entire width of the photosensitive drum 2 can be erased, and the eraser control circuit 82
controlled via.

In addition to the above, the microcomputer 81 also includes a main motor h1, a developing motor M4, a clutch CL for the timing roller pair 23,
, a clutch CL2 of the main paper feed roller 18, a clutch CL1 of the lower paper feed roller 19, a sheet position detection sensor 9 just before the timing roller pair 23, a fixed position detection switch 92 for the first mirror 13 as a scanner, and an image leading edge position detection A switch 93 and the like are also connected.

Next, based on the flowcharts shown in FIG. 7 and subsequent figures, the punch reference line imprint control will be mainly explained.

First, in the main flow of copying operation control shown in FIG. 7, in step #1, the microcomputer 81 performs an initial operation after being reset, and in step #2, an internal timer that defines the time for one routine is set, and then step Move on to #3. In step #3, it is determined whether or not copying is in progress. If copying is in progress, the process proceeds to step #7; if not, the process proceeds to step #4. In step #4, it is determined whether or not the mark rotation mode is selected, and the mode setting for whether or not the mark rotation mode is performed is performed accordingly.

Next, the process proceeds to step #5, where it is determined whether or not the double-sided copying mode is set, and the mode setting for double-sided copying or single-sided copying is performed accordingly. Thereafter, the process proceeds to step #6, where other settings such as the number of copies are made, and the process proceeds to step #7. In step #7, registration control is performed by turning on and off the register roller 23, and in the next step #8, if the double-sided copy mode is set, that process is performed. In step #9, the scanning system and the area around the photosensitive drum 2 are controlled, and in the final step #lO, a routine timer is checked, and when the timer exceeds, the process returns to step #2.

The mark rotation mode setting subroutine in step #4 will be explained based on the flowchart of FIG. 8.

At step #100, a flag F1 indicating whether mark rotation mode is set is checked. When flag F1 is “1”, “O” is set during mark rotation mode setting.
” indicates a non-setting state, and is cleared after reset.

When the flag Fl is 0" in step #100, the process proceeds to step #101; when it is "1'', the process proceeds to step #108.

In step #101, mark rotation mode selection key 67
Checks the flag F2 indicating whether or not it is on. Flag F2 indicates key-on when it is "1" and key-off when it is "0", and is cleared after reset.

When the flag F2 is "O" in step #101, the process proceeds to step #102, and when it is 1n, the process proceeds to step #105.

In step #102, it is checked whether the key 74 is on or not, and if it is off, the program returns directly. If it is on, the program proceeds to steps #103 and #104 to set the flag F2 to "1" and also display the mark rotation mode. 67a is turned on to display switching to mark rotation mode setting, and the process returns.

In step #105, it is checked whether the key 67 has been turned off after being turned on, that is, whether the operation of the key 67 has been completed. If it remains on, the process returns, and if it is turned off, the mark pass mode is not set. This means that the key 67 has been operated once, and step #106
, proceed to #107, set flag F1 to "1", and set flag F2
to 0" and set the shift amount to 2".

This shift m is set so that the punch reference line 42, which does not enter the copy area in the non-mark wrapping setting state, enters the copy area.
Copy sheet 7 at the drive timing of register roller 23
This is to shift the feeding timing to the transfer unit, and may be arbitrarily determined according to the set length of the punch reference line to be printed.

After setting the shift amount, flag F1 is “1” and F2 is “0”.
”, the process proceeds to step #109 via step #100.4108. In step #109, it is determined whether the key 67 has been turned on again, and if it has not been turned on, the process returns directly and maintains the mark 5 included mode setting state. Also, when the key 67 is turned on, step #110
, proceeds to #111, sets the flag F2 to "In", turns off the display section 67a, and displays the switch to cancel the setting state of the photo mode.Then, this flag I?2 becomes "1". Then, the process proceeds to step #112 via step #108.Here, it is determined whether the key 67 has been turned off after being turned on, and therefore whether the key 67 has been operated once in the photo mode setting state.Key 6
If 7 remains on, it returns as is, and when it turns off, it moves to steps #113 and #114 and sets the flag Fl.
, After setting F2 to 0'', set the shift amount to 0IIT.
Return to ln.

Next, the double-sided copy mode setting subroutine in step #5 of the main routine of FIG. 6 will be explained based on the flowchart of FIG. 9.

This subroutine is shown in step # of the main routine in Figure 6.
Setting and canceling of the double-sided copy mode, which determines whether or not to perform the double-sided copy control in step 8, is performed by setting the states of flags F4 and F5 in accordance with the operation of the key 68.

First, in step #200, the flag F4 indicating whether the double-sided copy mode is set is checked. This flag F4 indicates that the double-sided copy mode is set when it is "1", and the double-sided copy mode is canceled when it is "0", and is cleared after reset.

If the flag F4 is "0", the process proceeds to step #201 and subsequent steps, and if it is "1", the process proceeds to step #208 and subsequent steps.

In step #201, a flag F5 indicating whether the double-sided copy mode selection key 68 is on is checked. When this flag F5 is "1", the double-sided copy mode selection key 68 is turned on.
"0# indicates that the key 68 is off, and is cleared after reset. If flag F5 is "0" in step #201, proceed to step #202 and below; if "1", step #
Proceed to 205 and below.

In step #202, it is determined whether the key 68 is turned on. If it is not on, it returns as is, and if it is on, it proceeds to steps #203 and #204 and sets the flag F.
5 is set to "1" and the double-sided copy mode setting display section 68a is turned on to display switching to the double-sided copy mode setting state.

Here, since the flag F5 becomes "1", the process goes through steps #200 and #201 and then proceeds to step #205. Here, it is determined whether the key 68 is turned off. If it remains on, the program returns as is, and if it is turned off, it means that the key 68 has been operated once in the duplex copy mode non-setting state, and the process proceeds to step #206, sets flag F4 to "1", and sets flag F5. Set it to “0”.

As a result, the next step is step #200 and then step #
Proceed to 208. Here, flag F5 is checked.

Since flag F5 is “0”, step #20
9, it is determined whether the key 68 has been turned on. If it is not turned on, the process returns as is; if it is turned on, it means that the key 6B has been turned on in the double-sided copy mode setting state, and the process proceeds to steps #210 and #211 to set the flag F5 to "1" and display the The section 68a is turned off to display switching from the double-sided copy mode setting state to the single-sided copy mode setting state.

Since the flag F5 is set to "1" here, the process moves from step #208 to step #212.

In step #212, it is determined whether the key 68 is turned off. If it remains on, the process returns, and if it is turned off, the process moves to step #213 and flags F4 and F5 are set to "0".

Next, regarding the register storage engine control subroutine at step #7 in the main routine of FIG.
This will be explained based on the flowchart shown in the figure.

This subroutine controls whether the registration timing is shifted or not, depending on whether or not the punch reference line 42 is captured.

First, in steps #300a to 300e, the state counter for registration timing control is checked, and depending on which state counter is from O to 5, steps #301, #311, #321, # are performed.
Proceed to step 331, #341, or #351.

In step #301, it is determined whether or not copying is in progress. If copying is not in progress, the process returns; if copying is in progress, the process proceeds to step #302. In step #302, it is determined whether the position detection sensor 91 that detects the copy sheet 7 immediately before the register roller 23 is on. If it is not on, return as is; if it is on, step #303, #
The process moves to step 304. In step #303, copy sheet 7
When the roller reaches the register roller 23 and is stopped, the timer T1 necessary for the tip to align with the nip portion of the register roller 23 while forming a loop is set, and step #304
Now update the state counter.

With this update, the state counter becomes 1, and the process then proceeds to step #311. Here, it is determined whether timer T has expired. If it has not been completed, the process returns as is; if it has been completed, the process proceeds to steps #312 and #313, where the drive motor of the scanning system of the exposure optical system 11 is driven in the normal direction to start scanning exposure, and the state counter is updated. .

With this update, the state counter becomes 2, and the process then proceeds to step #321. In step #321, it is determined whether the switch 92 for scanning position detection of the exposure optical system 11 is turned on. If it is not turned on, the process returns as is, and if it is turned on, the process proceeds to step #322 and checks the flag F3 indicating whether or not the back side copy is being copied in the double-sided copy mode. Flag F3 is “0” for surface copying,
"1" indicates back side copying, and if the flag F3 is not "1", the process advances to step #323 and sets the time T2, which determines the timing for driving the register roller 23 in the case of normal copying without mark imprinting, in the timer. After step #
325. At step #322, flag F3 is set to “
l", the process advances to step #324. Here, the shift amount 2 set in the mark imprinting mode setting subroutine is
The value obtained by dividing the cylinder by the process speed is subtracted from the time T2, the obtained value is set in the timer, and the process moves to step #325. In other words, the time is set so that the drive timing of the register roller 23 is early when copying the back side. In step #325, the state counter is updated.

This update causes the state counter to become 3, and the process then proceeds to step #331. In step #331, it is determined whether the timer has completed the set time T2. If the process has not been completed, the process returns; if it has been completed, the process moves to step #332, where the clutch CLI for driving the register roller 23 is turned on.

Here, the setting time T2 of the timer that determines the timing to turn on the clutch CLI is based on the previous setting, and is shorter in the case of back side copying in the duplex copying mode than in the front side copying, and is shorter than the shift M 21 nm set by the copy sheet 7. As a result, the image of the punch reference line 42 formed at the leading edge of the image on the photosensitive drum 2 is transferred and an image is formed only when copying the back side of a copy sheet.

After this, the state counter is updated in step #333. As a result, the state counter becomes 4 and the process then proceeds to step #341. Here, position detection sensor 91
Determine whether the is turned off. If it is not turned off, the copy sheet 7 is still passing and returns as is.

When it is turned off, it means that the copy sheet 7 has passed, and the process moves to steps #342 and #343. After setting the timer to a time T3 that is sufficient for the copy sheet 7 to pull out of the register roller 23, the state counter is started. Update.

This update causes the state counter to become 5, and the process then proceeds to step #351. Here, the timer is set to T.
Determine whether or not step 3 has been completed, and if not, return as is, and if completed, proceed to steps #352 and #3.
53, turn off the clutch CLI, and copy sheet 7.
The drive of the register roller 23 that has finished passing is stopped, and the state is returned to 0.

Further, the double-sided copy control subroutine at step #8 in the main flow of FIG. 6 will be explained based on the flowchart of FIG. 11.

In the double-sided copy mode, this subroutine sets the flag F3 to "0" or "1" depending on whether it is front side copy or back side copy.
Set to crab.

First, in step #400, it is determined whether the flag F4 indicating whether the duplex copying mode is set is "1". If not “1”, return as is; if “1”, step #40
1, it is checked whether the state counter is "0", and if it is "0", it proceeds to step #402 and below, and becomes "1".
If so, proceed to step #405 and subsequent steps.

In step #402, it is determined whether front side copying is in progress.

If the front side is not being copied, the process returns directly; if the front side is being copied, the process proceeds to steps #403 and #404, where the flag F3 is set to 0" and the state counter is set to "1".

This causes the process to proceed to step #405. Here, it is determined whether the front side is being copied. If the back side is not being copied, return directly; if the back side is being copied, step #406
, proceeds to #407, sets the flag F3 to "1", and then sets the state counter to "0".

FIG. 12 is a flowchart of a double-sided copy control subroutine showing a second embodiment of the present invention.

In this embodiment, in the case of double-sided copying, it is possible to select whether to imprint the punch reference line 42 on the front side or the back side. Most of the flow is the same as in the previous embodiment, and to explain only the different points, the operation panel is provided with a changeover switch (not shown) for selecting whether to print the punch reference line on the front side or the back side. . In response to this,
In the front side copy control, it is determined whether imprinting on the back side is selected in step #503, and in the back side copy control, the state of the flag F3 is determined in step #508. performs the opposite control.

If imprinting on the back side is selected in step #503, the flag F3 is set to "0" in step #504 as in the previous embodiment.
”, proceed to step #506 and set the state counter to “1”. If back side imprinting is not selected, front side imprinting is selected, and step #506 is set to “1”. The process proceeds to step #505, where the flag F3 is set to "1", contrary to the previous embodiment, and then the process proceeds to step #506.

In step #508, it is determined whether the flag F3 is "0". This corresponds to changing the way the flag F3 is set depending on whether printing of the punch reference line is selected on the back side or not. Step #5 after setting it to “1”
11 and sets the state counter to "0", but if flag F3 is not "0", step #510
Proceed to step #511 after setting flag F3 to “0”
to move to.

As a result, if the back side is selected as the surface on which the punch reference line will be printed, the flag 1'+3 will be set to "1" during back side copying, and the punch reference line will be printed on the back side. Also, if the front side is selected, the flag F3 will be set to “
1'' and the punch reference line is printed on the front side.

Further, in the above embodiment, only the case of imprinting a punch reference image has been described, but the present invention can be similarly applied to a case where an index image whose position is changed for each page or for each type of image is imprinted on one side of a copy sheet. The index image can be imprinted by allowing a line image to be imprinted on the entire length of one side of the copy sheet, and by performing erase control so that portions of the line image in different positions are successively copied.

(Effects of the Invention) According to the present invention, since it has the above-described structure and operation, in the case of double-sided copying, the peripheral mark is imprinted only when copying either the front side or the back side, so that imprinting is performed on both sides. This eliminates things that are unsightly or confusing when done. Also, unnecessary toner consumption is eliminated.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electrophotographic copying machine showing a first embodiment of the present invention, FIG. 2 is a perspective view of an inter-image eraser, FIG. 3 is a perspective view of the machine body 1, and FIG. 4 is a view of the original scale. 5 is a plan view of the operation panel, FIG. 6 is a block diagram of the control circuit, FIG. 7 is a flowchart showing the main routine of overall control, and FIG. 8 is a flowchart of the mark imprint mode setting subroutine. FIG. 9 is a flowchart of the double-sided copy mode setting subroutine, FIG. 1O is a flowchart of the registration control subroutine, FIG. 11 is a flowchart of the double-sided copy control subroutine, and FIG. 12 is a double-sided copying mode showing a second embodiment of the present invention. 3 is a flowchart of a control subroutine. 7・・・−・−−−m−・−・・−−−−−−m−Copy sheet 2−−−−−−−−−−−−Photosensitive drum 11−
・−−11−−−−−−−−−−−−・−Exposure optical system 1
8.19.44---Paper feed roller 26------Intermediate tray 23a
, 28b --- Conveyance path 42 --- Punch reference line 67 ---
-1-- −−−−−−−・・−
Microcomputer control means, mark imprinting means, double-sided image forming means

Claims (1)

[Claims] (1) A sheet peripheral mark imprinting means for imprinting a peripheral mark such as a punch reference image or an index image on the periphery of a copy sheet, a means for selecting an imprint mode for imprinting the peripheral mark, and an image forming apparatus for imprinting peripheral marks on both sides of the copy sheet. means for selecting a double-sided copying mode; and a control means for operating the mark imprinting means only on one of the front side copying and the back side copying when both the double-sided copying mode and the mark imprinting mode are selected. A device for imprinting a mark around a sheet of a copying machine, characterized in that the device includes: