JPS61196269A - Electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To take a copy efficiently without performing any unnecessary operation when a final original is copied in composite copy mode by resetting the composite copy mode during final original copying operation and performing normal copying operation when it is decided in composite copy mode that the final original is odd-numbered. CONSTITUTION:When F1='1' (composite copy mode), it is discriminated whether an original to be copied is the final original or not. This decision making operation is performed with the detection signal of the 2nd CPUP 67 which indicates whether there or not is an original on the original platen 11 of an original conveying device ADF 100. When it is decided that the final original is present, it is discriminated by the 2nd CPU 67 whether an original count signal indicates an add number or not. When so, the composite flag F1 is set to '0', namely, a normal copy mode is entered; when a composite copy is taken in ADF mode, the final is copied in normal copy mode.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an electrophotographic copying machine that can combine and copy two originals onto one side of a single sheet of copy paper.

(Prior Art and Problems to be Solved by the Invention) In recent years, with the reduction in documents and copy saving, double-sided copying or two-original copying has been practiced. .

Conventionally, in order to copy two originals onto one side of one sheet of copy paper, the two originals were placed side by side on the original table of the copying machine.
This was then copied onto a single sheet of copy paper with a single exposure. However, with this method, if the two originals are different sizes, the conditions under which two large-sized originals can be copied (copy paper size) must be met.

If you select a condition that allows copying of two small-sized originals, problems may occur such as if you select a condition that allows copying of two small-sized originals.

2. Description of the Related Art An electrophotographic copying machine that has the function of copying two originals onto one side of a single sheet of copy paper has already been commercialized as an actual machine. In this copying machine, copy paper can be passed twice in the composite copy mode, but the apparatus becomes larger and more complicated. Also, it is necessary to consider where to place the second manuscript.

In another application, the inventors of the present invention have disclosed an electrophotographic copying machine with a simple configuration that has the function of copying two originals onto one side of a single sheet of copy paper. This electrophotographic copying machine includes a copy paper transport means that transports the copy paper to a transfer section or stops the transport in response to a control signal, and a copy paper transport means that separates the copy paper from the photoreceptor in the transfer section in response to a control signal. a separating means for contacting;
A document conveyance means that conveys the document to an exposure position and outputs an arrival signal to the control means when the document reaches a predetermined position, and after receiving the arrival signal from the document conveyance means, starts a copying operation and In copying the original document, when the center of the length of the copy paper in the conveying direction reaches the transfer section, outputting a control signal to the copy paper conveying means to stop conveying the copy paper, and A control signal for separating the copy paper from the photoreceptor is output to the above-mentioned separating means, and in one copy of the second original, the surface portion of the photoreceptor corresponding to the start of exposure of the second original reaches the transfer section. and a control means for outputting a control signal for bringing the copy paper into contact with the photoreceptor to the above-mentioned separating means, and a control signal for conveying the copy paper to the above-mentioned copy paper conveying means. It is characterized by:

In this electrophotographic copying machine, two original documents can be copied into the first half and the second half of one side of a sheet of copy paper in the transport direction using the document transport means. When scanning the first document, the conveyance of the copy paper is stopped when the end of the first half of the copy paper reaches the transfer section, and the copy paper is temporarily separated from the photoreceptor. The copy paper remains on standby until the second original is copied. Next, when scanning the second original, the copy paper is brought into contact with the photoconductor when the corresponding photoconductor surface portion reaches the transfer section at the start of the second exposure.
Conveyance of copy paper is resumed.

With this copying machine, it is possible to combine two original documents onto one side of one copy paper by scanning twice and copying once, using very simple means.

(Problems to be Solved by the Invention) When creating a composite copy in the composite copy mode with this electrophotographic copying machine, if the number of original sheets is an odd number, only half of the copy paper is conveyed into the copying machine when the final original is copied. So it remains. To eject this remaining copy paper,
You have to press the print key and perform a useless blank copy operation.

An object of the present invention is to provide an electrophotographic copying machine that efficiently completes the copying operation without performing this last wasteful operation.

(Means for Solving the Problems) The electrophotographic copying machine according to the present invention includes a copy paper conveyance means that conveys copy paper to a transfer section or stops conveyance in response to a control signal, and a copy paper conveyance means that conveys copy paper to a transfer section in response to a control signal, and a separating means for separating or contacting the copy paper from the photoreceptor in the transfer section; a document conveying means for conveying the document to the exposure position and outputting an arrival signal to the control means when the document reaches a predetermined position; Final document determining means for determining whether or not the final document is an odd-numbered sheet when two documents are sequentially combined and copied on one side of one copy paper with the first half and the second half in the conveying direction. After receiving the arrival signal from the document transport means, when the center of the length of the copy paper in the transport direction reaches the transfer section in copying the first original, the copy paper transport means outputting a control signal for stopping the conveyance of the copy paper, and outputting a control signal for separating the copy paper from the photoreceptor to the separating means, and in copying the second original; When the surface portion of the photoconductor corresponding to the start of exposure reaches the transfer section, a control signal is output to the separating means to bring the copy paper into contact with the photoconductor; and a control means for outputting a control signal for conveying the paper,
When the final original determining means determines that the final original is an odd-numbered sheet, the controlling means copies one original onto one sheet of copy paper. It is characterized by outputting a control signal to.

(Function) When it is determined that the final document is an odd-numbered sheet in composite copy mode, the composite copy mode is canceled when copying the final document, and normal copying operation is performed.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

(a) Structure of Copying Machine FIG. 3 is a sectional view schematically showing an electrophotographic copying machine according to the present invention. A photoreceptor drum 2 that can be rotated counterclockwise is disposed in the center of the copying machine main body l.A main eraser lamp 3, a main charger 4, and a sub-eraser are arranged around the photoreceptor drum 2. lamp 5, developing device 6, transfer charger 7, transfer paper separation charger 8,
A blade type cleaner device 9 and the like are sequentially installed.

The photoreceptor drum 2 is a drum provided with a photoreceptor (for example, selenium) on its surface, and an eraser lamp 3 is used for each copy.
．． At step 5, it is irradiated with light, passed through a charger 4 to be charged, and then subjected to image exposure from an optical system, which will be described next.

The optical system is installed below the document table 11 so that it can scan the document image. The optical system includes a light source 12 and a first mirror 1.
3. Second mirror 14, third mirror 15, projection lens I6
, and a fourth mirror 17. The original image is displayed on each mirror 13, 14, 15.1 as indicated by a dashed line 18.
7 and reaches the photosensitive drum 2. When the copying magnification is n, the light source 12 and the first mirror 13. What is photoreceptor drum 2?
It moves to the left at a speed of (v/n) in response to the rotation at the circumferential velocity V (constant regardless of the magnification or magnification change), and at the same time, the second mirror I4 and the third mirror ■5 is (v/2
Move to the left at a speed of n). Along with this movement, the image is exposed from the fourth mirror 17 onto the photosensitive drum 2 in a slit shape.

Operation panel (see Figure 7) 19 for operating the copying machine
is provided on the upper surface of the copying machine main body l.

On the left side of the copying machine body is an automatic paper feed cassette 20°2!
A paper feed section 22,23 and a manual paper feed section 24 are installed. The copy paper is selectively fed to each paper feed roller 2 from the automatic paper feed cassette 20.21 or the manual paper feed section 24.
6, 27, 28. It is supplied into the copying machine main body i at 29,
The timing upper roller 38. which passes through each pair of conveying rollers 3° to 37 and is in a pressed state. It is conveyed to the lower roller 39, where it is temporarily on standby.

The transfer stopper mechanism 40 is a mechanism that brings the copy paper into contact with or separates from the photoreceptor drum 2. Figures 4 and 5 are
Transfer stopper mechanism 4° cross section MJ - 姐坩M, respectively
Timing rollers 38 and 39 provided near the copying machine are configured so that driving force is transmitted via a registration clutch (not shown), and the copying process is performed by a mechanism described later. Stops copy paper transport during operation.

On the other hand, the timing rollers 38 and 39 and the transfer charger 7
Upper and lower transfer guides 41 and 42 located between the transfer guides 41 and 42 are swingably supported by a shaft 43, and are connected to a transfer solenoid 46 via a transfer lever 44 and a connecting ring 45. The swinging distance of the shaft 43 can be adjusted by a stroke adjustment plate 47. The copy paper passes between transfer guides 41,42. The transfer guides 41, 42 are connected to the transfer solenoid 46.
The photoreceptor 2 is rotated counterclockwise around the shaft 43 by the operation of the photoreceptor 2, and the photoreceptor 2 and the copy paper are brought into contact with each other at the transfer section. Conversely, when the transfer solenoid 46 is inactivated (off), the transfer guide parts 41 and 42 rotate clockwise around the shaft 43 from the solid line position in FIG. Forcibly separate the copy paper that is being used. The transfer solenoid 46 and the registration clutch are connected to the output port of the CPU 61 of the control circuit (FIG. 6). Note that the operation of the transfer solenoid 46 and the operation of the transfer guides 41, 42 may be reversed.

The explanation will be returned to FIG. 3. During transfer, the copy paper fed by the timing rollers 38 and 39 comes into close contact with the photoreceptor drum 2 at the transfer section, and the toner image is transferred by the corona discharge of the transfer charger 7, and then by the corona discharge of the separation charger 8. The transfer paper is separated from the photosensitive drum 2 by its own stiffness. Subsequently, the copy paper is conveyed to the right as the belt 5I rotates clockwise while being sucked onto a conveyor belt 51 equipped with an air suction means (not shown). Next, the toner image is melted and fixed by passing through a fixing device 52. and,
It passes through a pair of discharge rollers 53 and 54 and is discharged to a tray 55 outside the copying machine main body I or to a collating machine (not shown).

Switches SWI to SW4 and SW6 to SW9 are microswitches installed in parallel to each paper feed unit 22.23, and are used to switch the copy paper in either the vertical or horizontal direction with respect to the size of the copy paper in the cassette 20.21 and the paper feed direction. Detect whether it is installed. The sizes that can be copied, that is, the sizes of copy paper that can be set in each paper feed section 22.23 are, for example, [A3], [A4], [A
5], [A6].

[B11. [B5], [B6], [A4], [A
5].

For [B5], vertical or horizontal can be selected. In addition, switches 5WI-9W4, SW6 to SW9 are cassettes) 20
．． 21 is also detected, and this is detected when the paper feed section 22.
This means that the presence or absence of copy paper at step 23 is indirectly detected. The size and setting direction of the copy paper in each paper feed section 22, 23 are controlled by switches SWt~SW4, SW6~
SW9 on.

A 4-bit code corresponding to the OFF combination is detected and stored in the RAM of the CPU 61 of the control circuit (see FIG. 6). An example of the code table for switches 5W1-9W4 is shown in the table. In this table, "0" indicates that the switch is on, and "B" indicates that the switch is off. If all the switches are off, it means that the cassette 21 is not installed in the paper feed section, that is, copy paper is not loaded. In addition, the microswitch SW5 provided in each paper feed section 22, 23
5WIO directly detects the presence or absence of copy paper in the cassettes 20 and 21, respectively.

On the other hand, an document feeder (ADF) 100 is removably installed on the upper surface of the main body of the copying machine. As described below, AD
When it is detected that the F 100 is electrically connected to the copying machine main body and installed in a predetermined position, the ADF'lOO
The control of the copying machine and the copying machine are related to each other. Furthermore, A
When a document is inserted into the DF' 100, the copy start mode of the copier changes from the manual start mode, in which the copy operation is started by turning on the print key SWI, to A.
The copying operation is switched to the ADF start mode in which a copying operation is started by a start signal sent from DFloo.

In the ADF start mode, when a document is inserted into the ADFloo's document tray 11 and the ADF start switch is pressed, the copying machine remains in the standby state and starts the ADF start mode.
The F I OO starts operating, feeds the inserted originals one by one along the original platen 11 of the copying machine, stops at a predetermined position, and the ADF 100 issues a start signal to the copying machine to start copying. The operation begins. Furthermore, when the final scanning movement for the original is completed, the copying machine outputs an original ejection signal to the ADF+00, and the ADFlo
o discharges the original onto the output tray 118.

The interlocking with the ADF 100 described above will be explained in detail. A document is fed into the paper feed section 104 of the ADF 100 by an automatic feeding and loading section or a manual insertion section.

The automatic feeding device 102 includes a paper feed tray 122 equipped with a slidable document guide (not shown) that regulates the position of the sheet document 120 in the width direction, a pickup roller 124, and forward and reverse rotation separating rollers 126a and 126b. When the original 120 is placed in a predetermined position on the paper feed tray 122, this state is detected by the original presence/absence sensors 128a and 1.
28b detects. In this state, when the operator turns on an operation switch (not shown) to give a copy start signal, the pickup roller 130 descends and the top layer of the document 120 is
Then, the paper feeding operation is performed, and the document 120 is transferred to the document sensor 13.
2, the signal causes the reverse separation roller 126b to rotate.
is in pressure contact with the normal rotating separation roller 126a, and the original 120 is fed into the paper feed section 102 by the relative rotation of both rollers.

A paper feeding path is formed in the paper feeding section 104 by a guide plate. When the document inserted between the pair of pinch coolers 106 and 107 is detected by the document insertion detection sensor 5EN3, the pair of pinch rollers 106 and 107 are pressed against each other, and the belt 110 is driven. Thereafter, the pair of pinch rollers 106 and 107 are driven with a slight delay, and the gate stopper 108 is retracted from the passage by the action of a solenoid (not shown), and the original is sent out.

The document insertion detection sensor 5EN3 turns on when it detects the leading edge of the fed document and turns off when the trailing edge passes.The pinch roller 106 and the auxiliary roller 107 are separated after a predetermined delay time from the off signal, and the stopper 108 returns to its locked position within the passageway.

The fed original is conveyed while being sandwiched between the guide member and a belt 110 driven in the direction of arrow A, and further guided onto the original placing table 11 by the belt 110, and stopped at a predetermined exposure position. The document stop control is performed by the document insertion detection sensor 5EN3 described above or the document sensor 5 described later.
A signal for stopping the drive of the belt 110 may be obtained by operating an appropriate timer means from the detection signal from the ENI, or a stopper may be protruded to the document stopping position. Note that 112 is a drive roller that drives the belt 11O, 114 is a tension roller, and 116 is a presser roller.

When the original is stopped on the original placing table 11, the ADFloo
A signal is output to the copying machine, and the copying operation is started. When the scanning movement of the scanning optical system accompanying the copying operation is completed, the copying machine issues a signal to the ADF 100, and the belt 110 is driven again to transport the original on the original placing table 2 in the ejection direction. Note that, if the copying machine is in the multi-copy mode, the document ejecting operation does not start until the scanning movement related to the final copy is completed.

FIG. 6 is a circuit diagram of a control circuit that controls the operation of the embodiment of the present invention. The input/output board of the first CPU 61 includes a numeric keypad 62, a print key 5Wll, and a mode switching key 5W arranged on the operation panel 19 of the copying machine (see FIG. 7).
12, a magnification select key 5WI3, a registration switch 5W19 provided in the optical system (see FIG. 3), and a key matrix 63 including the previously described SWI to 5WIO and the like are connected. Further, a display device 64 that displays the number of copies in response to the operation of the numeric keypad 62 and a light emitting diode 65 for various displays are connected to the output port via a decoder 66. Furthermore, a main motor, a developing motor, an optical system drive motor, a resist clutch, and a transfer solenoid 46 are connected to the output port. In addition, the terminal Bl
, B2 are the main motor and AD of the copying machine, respectively.
A motor pulse signal generated in synchronization with the rotation of the motor that drives the belt in F is input. This input signal synchronizes the mechanical drive and the control by the first CPU 61.

The second CPU 67 is provided within the ADF 100 and
Controls the operation of Ploo. The input port of the second CPU 67 includes an ADF open/close detection switch P.

SW, a start switch SSW of ADF', a sensor 5EN1 that detects the presence or absence of a document on the document table 11, and sensors 5EN2 to 5EN4 that detect the conveyance state of the document.
is connected. The output port is connected to a drive circuit (not shown) for a motor that drives a pinch roller or the like, a drive circuit that presses a pair of pinch rollers, and a press solenoid.

The second CPU 67 operates under the first CPU 61 . Clock SCK for data sampling and output of tth CPU61, interrupt signal output PCO, data output terminal 5OUT
and data input terminal SIN are clock S
CK, an interrupt signal INT, a data input terminal SIN, and a data output terminal 5OUT.

As described above, the first and second CPUs 61 and 67 associated with the copying machine and the ADF 100 perform the processes shown in the flowcharts of FIGS. 1, 2, and 9 to 11 while exchanging signals with each other. Execute.

The operation panel shown in FIG. 7 is equipped with various operation keys. The print key 5WII is a key for starting a copying operation. Mode switching key (copy mode) SW12
is a key for switching between normal copy mode and composite copy mode.

Note that the first original mode (original 1) is available in composite copy mode.
) and a second original mode (original 2). The magnification select key (magnification) SW13 is a key for selecting the magnification. The paper selection key is a key for selecting the size of copy paper.

(b) Copying Function Next, the copying mode of the electrophotographic copying machine having the above configuration will be explained. Documents are fed in two modes. In manual mode, documents are fed one by one manually by an operator. In ADF mode, documents are automatically fed by the document feeder. The copy mode includes a normal copy mode and a composite copy mode (2 scan copy mode). In the normal copy mode, normal copying operations are performed. In other words, in one scan (exposure)! Make a copy. For this normal copy mode,
Further explanation will be omitted. In the composite copy mode, two originals are each copied onto the first half and the second half of one sheet of copy paper by scanning twice.

FIG. 8 shows a copy sheet made in composite copy mode. 1 of the first document (original L) in the front (right side) in the transport direction.
An image corresponding to the exposure of the second scan is obtained, and an image corresponding to the exposure of the second scan of the second document (original 2) is obtained at the rear (left side) in the conveyance direction. At this time, the copy paper is transported by 1/2 for each scan.

Both modes can be selectively set, and the switching is performed by operating the mode switching key 5W12. The copying operation in each mode is started by turning on the print key 5WII or the ADF start switch SSW.

The composite copy mode using ADF will be further explained. Cooperation between the copying machine and the ADF 100 enables composite copying without the presence of an operator. 1 at ADF
Manuscript mounting table for the 1st sheet of manuscript! 1 After the transfer to the top is completed,
Copy sheets selectively fed from each sheet feeding section are conveyed via intermediate rollers to timing rollers 38 and 39, which are in a pressed state, and are temporarily put on standby there. The optical system scans the document at a speed corresponding to a preselected magnification.

The copying operation is started by turning on the registration switch 5W19.

The times that determine the copying operation are a magnification timer T0, a registration delay timer T, and a registration timer T.

It is. Magnification timer T. is determined corresponding to the selected magnification, and is the time during which the copy paper should wait further at the timing roller position. The registration delay timer T1 is activated by the timing roller 3 during the second original mode of the composite copy mode.
This is a timer that further delays the driving of 8 and 39. In the second original mode, the copy paper is waiting in advance at a position half way past the transfer section. Therefore, in order to synchronize this position with the leading edge position of the second document on the photoreceptor drum 2, the registration rollers 38 and 39 are operated until the corresponding photoreceptor drum surface portion reaches the transfer section at the start of the second exposure. Because it has to be delayed. The registration timer T is the conveyance time of copy paper during transfer. This registration timer T2 has the following formula: (1) In normal copy mode, T t = T
s + L / V + α, (2a) When the first original is in composite copy mode, T! = T3 + L / 2V, (2b) When the second original is in composite copy mode, T 2 = L /
2 given as v+α. Here, if L is the distance from the timing rollers 38, 39 to the transfer section, then T
3=R,/v.

In the first original mode, exposure of the first original is started after the ADF completes transporting the original onto the original placing table 11 of the copying machine. Timing rollers 38 and 39 set the timing so that the leading edge of the copy paper waiting here coincides with the leading edge of the image formed on the photoreceptor at the transfer section.
That is, the time T elapses after the registration switch 5W19 is turned on.

It is rotated when the time has elapsed.

The transfer solenoid 46 is the timing roller 3B.

It operates simultaneously with the start of rotation of the transfer guide 41.39.
42 is rotated to the position shown by the solid line in FIG. 1, the copy paper is brought into contact with the photosensitive drum 2, and transfer is started. When the copying of the first original is completed, that is, 'rt = Ts +
After L/2v has elapsed, the length of the selected copy paper in the conveyance direction! /2 reaches the transfer section, the driving of the timing rollers 38 and 39 is stopped, the transfer solenoid 46 is turned off, and the copy paper is separated from the photoreceptor.

Subsequently (in the second original mode), originals are exchanged in the ADF, and after the first original is ejected, the second original is conveyed onto the original placing table 11. After the conveyance is completed, exposure of the second original is started. T after turning on the resist switch 5W19. +T, when time has elapsed, i.e.
When the leading edge of the image formed on the photoreceptor reaches the transfer section, the transfer solenoid 46 is activated to bring the copy paper into contact with the photoreceptor, and the timing rollers 38 and 39 are driven to start the transfer. . Registration time T.

After a time period of =L/2v+α has elapsed, the copying of the second original is completed. Subsequently, the copy paper is suction-conveyed by a conveyor belt 51 equipped with an air suction means, passes through a fixing device 52, and is transferred from discharge rollers 53 and 54 to a tray 5 outside the copying machine main body.
5 or discharged to a collating machine (not shown) or the like.

(C) Flowchart of copying control The operation of the copying machine is controlled by a program stored in the CPU 61 of the control circuit. Figure 1, Figure 2, Figure 9~
FIG. 1I shows a flowchart of this program.

FIG. 9 is a flowchart generally showing the processing executed by the CPU 61. First, various initial states of the copying operation are set. In step P1, initialization such as resetting various flags is performed.

The flags include a copy flag (Fo) that indicates that the copier is ready for copying, a composition flag (Fl) that indicates that it is in composite copy mode, and a document flag that indicates that it is the first document in composite copy mode. There is a flag (F,).

In step P2, a timer (main timer) for defining the length of the l routine is set. In step P3, processing for inputting from the numeric keypad 62 and the like and processing for storing the copy paper size set in each paper feed section in the internal RAM are performed. Furthermore, set the magnification. In step P4, a mode switching process is performed to switch the mode of the copying machine to normal copy mode or composite copy mode (see FIG. 1θ). When the mode switching key 5W12 is operated, the state of the copying machine is determined, and if it is the first original mode in the composite copy mode, it is switched to the normal copy mode, and if it is the normal copy mode, it is switched to the composite copy mode. Note that during the copying operation, the mode switching key 5
WI2 operations are not accepted. In step P5, copy start processing is performed (see FIGS. 1 and 2).

Next, a copying operation is performed. If it is determined in step P6 that the copying machine is in the operating state (F'Q="bi"), then in step P7, copying is performed in accordance with each copy mode (see FIG. 11).

Next, in step P8, data is transmitted to and received from ADFloo. The transmission and reception processing of the ADF 10'O is processed by an interrupt from the first CPU 61. In step P9, it is determined whether the timer time set in step P2 has expired. If it has ended, return to step P2. If not, loop step P9 and
End routine length.

Next, the mode switching subroutine (step P4) will be explained with reference to the flowchart of FIG. 1O. In steps P21 and P22, it is determined whether the copying machine is not in operation (copy flag F.="0") and whether the mode switching key 5W12 is on. If so, proceed to step P23. If the mode switching key 5W12 is in operation, the operation of the mode switching key 5W12 is not accepted.

Steps P22 to P25 are processing for switching from normal copy mode to composite copy mode. If it is determined in step P22 that the mode switching key 5W12 has been operated, and if it is determined in step P23 that the composite copy flag (FD is "0"), in step P24, the flag (FD is set to composite copy mode) Step P
In step 25, the flag (F2) indicating that it is the first original is set to "B".

On the other hand, step P22. P23. P26. P27 is a process for switching from composite copy mode to normal copy mode. In step P22, it is determined that the mode switching key 5W12 has been operated, and then in step P23, the composition flag (Fl) is "BI", and further, in step P26, the original flag (F,) is "1". If it is determined that this is the case, the composition flag (Fl) is set to "0" in step P27. In step P26, if the composite copying is in the second original mode (F, -0"), the mode is not switched. To prevent copy paper from being left in a copying machine.

Next, the copy processing subroutine (step P10) will be explained with reference to the flowchart of FIG. First, in step P31, the main motor etc. are driven and scanning is started at a speed corresponding to the selected magnification.

Next, in step P32, a scan timer is set. The copy paper is conveyed to timing rollers 38 and 39, where it is temporarily put on standby.

Next, the timing of operation of the registration clutch and the transfer solenoid 46 will be explained. First, in step P33, the state of the registration switch 5W19 provided in the optical system is determined. If the registration switch 5W19 is not on, wait until it is on. If it is on, i.e.
When the optical system has moved by a predetermined distance, the registration corresponding to the preselected magnification (i.e., the holding of the copy paper by the timing rollers 38 and 39) is performed.
Magnification timer T0 is set. Next, step P35
At , it is determined whether T is completed or not. Continue judging until finished. If it has finished, then step P3
At step 6, it is determined whether the copy is a normal copy or a composite copy. When the composite copy flag F+ is not "Pi", that is, when it is a normal copy, the process advances to step P40.Fl is "
1', that is, when the composite copy mode is in effect, in step P37, the second original (i.e.,
It is determined whether the original document) lag F2-“0”). If it is the first original, step P4 is applied as in the case of normal copying.
Go to 0. If it is the second document, then in step P38, a registration delay timer T is set. That is, T is set only in the composite copy mode and when the second original is used. T1 is the time during which the exposed portion of the photosensitive drum 2 is rotated to the transfer section. Next, in step P39, it is determined whether T1 has ended. If it is not finished, wait until it is finished. When finished, next, in step P40, the resist clutch and transfer solenoid 46 are
is turned on, and the transfer guides 41 and 42 are moved to bring the copy paper into contact with the photoreceptor. Transfer is thus started.

In the next steps P41 to P45, a registration timer T is set. T is the conveyance time of copy paper during transfer. Let T3 be the transport time from the timing rollers 38 and 39 to the transfer section, L be the length in the copy paper transport direction, ■ be the speed at which the copy paper is transported through the transfer section, and α be a margin value taking into account slips and the like.

This transportation time T is (f)! In normal copy mode, T
t=T3+L/V+(1(Step P
43), (2a) When the first original is in composite copy mode,
T, = 'l', 10L/2v (step P44), (2b
) When creating the second original in composite copy mode, T x = L
/ 2 v+α (step P45). When each mode is determined based on the composition flag Fl (step P41) and the original flag pt (step P42), a registration timer T is set correspondingly.

(Steps P43 to P45).

Next, in step P46, it is determined whether the registration timer T has expired, that is, whether or not transfer is in progress. If it is not finished, wait until it is finished. When the process is completed, the registration clutch and the transfer solenoid 46 are turned off in step P47. Next, in step P48, it is determined whether the scan timer has expired. If not, repeat this step. If it ends,
At step P49, the optical system is reset.

Next, in step P50, it is determined whether the mode is ADF mode. If it is the ADP mode, then set the document discharge signal to "B" (step P5I) and proceed to step P52. If the mode is the manual mode, proceed directly to step P52.
Proceed to. Note that the document ejection signal is sent to the second CPU 6 of the ADF.
7, and upon receiving this signal, AD
F100 discharges the original onto the paper discharge tray [18].

In the next steps P52 to P56, flag processing is performed after the copy processing. First, in step P52, the composition flag F is determined. If FI="1" (composite copy mode), then in step P53, the process proceeds to step P56.
The document flag F is determined. If P,="Bi (first original)," set F2="0" (step P54).F,
If = "0" (second original), Ft = "1" (step P55). Finally, in any mode, set the copy flag FO to "0" (step P
56), return.

(d) Copy start processing (automatic processing at the time of final document) Copy start processing (step P5), which is a feature of this embodiment
will be explained with reference to the flowchart in FIG. First, in step P61, it is determined whether the mode is ADF' mode. When the ADF start switch SSW is turned on after it is detected that there is a document on the document table 11 of the ADP 100, the ADF start switch SSW is turned on by the signal from the 20th PU 67.
mode. If it is determined that the mode is ADF mode, a copy start signal transmitted from the ADF 100 is determined in step P62. If the copy start signal is not "Bi", the process returns. If it is "Bi", the synthesis flag Fl is determined in step P63. F+=“1”
If it is (composite copy mode), then it is determined in step P64 whether or not it is the final document. This judgment is based on the 20th
Document mounting table 1 of ADF I OO sent from PU67
This can be done using a detection signal indicating the presence or absence of a document on the document. If it is determined that it is the final manuscript, then in step P65, the 20th page
It is determined whether the document count signal at U87 is an odd number. If it is determined that the number is odd, then step P6
In step P6, the composition flag F1 is set to "0", that is, the normal copy mode is set, and the process proceeds to step P69.

If a negative determination is made in steps P63 to P65, the process proceeds to step P69. If it is determined in step P61 that the mode is not ADF mode, then in step P67 the copy flag F is set. Make a judgment. Copy start ready state (F0
="0"), proceed to step P68; otherwise, return. In step P68, print key 5
It is determined whether WII is on. If not on, return. If it is on, the process advances to step P69.

In step P69, the copy flag F0 is set to "1", and the process returns.

In the above process, when composite copying is performed in the ADF mode, if the final document is an odd-numbered document, the normal copy mode is set.

FIG. 2 shows a flowchart of another embodiment of copy start processing. The difference from the flowchart shown in FIG. 1 is step P64 and step P65. Step P
In 64, the document flag F, is determined, and F,=
If it is the first document, the process proceeds to step P65. In step P65, if it is determined that there is no document on the document table 11 of the ADFloo for a predetermined period of time, it is determined that the document is the final document. In step P66, the normal copy mode is set.

(Effects of the Invention) According to the present invention, when copying the final original in composite copy mode,
Copying can be completed efficiently without unnecessary operations.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are flowcharts of copy start processing, respectively. FIG. 3 is a cross-sectional view of an embodiment of the invention. FIG. 4 and FIG. 5 are a partial cross-sectional view and a perspective view, respectively, of the vicinity of the transfer section according to the embodiment of the present invention. FIG. 6 is a circuit diagram of the control circuit. FIG. 7 is a plan view of the operation panel. FIG. 8 is a plan view of copy paper in composite copy mode. FIG. 9 is a flowchart of copying. FIG. 1O is a flowchart of mode switching. FIG. 11 is a flowchart of the copy processing subroutine. ■... Copying machine body, 2... Photosensitive drum, 3... Eraser lamp, 4... Charger, 6... Developing device, 7... Transfer charger, 8... Separation Charger, 11... Document placement table, 12-17... Optical system, 22-24... Paper feeding system, 38.39... Timing roller, 40... Transfer stopper mechanism, 5I... Conveyor belt, 52... Fixing device, 5
3.54...Discharge roller. Patent applicant Minolta Camera Co., Ltd. Representative
Person Patent attorney Aohaku Ao and 2 others Fig. 4 91 ◆ Fig. 1 Fig. 2 Fig. 7 Fig. 8 Fig. 9 Fig. 10

Claims (1)

[Claims] (1) Copy paper transport means for transporting the copy paper to the transfer section or stopping the transport in response to a control signal; and separation means for separating the copy paper from or in contact with the photoreceptor at the transfer section in response to the control signal. a document conveying means that conveys the document to an exposure position and outputs an arrival signal to the control means when the document reaches a predetermined position; When the first half and the second half are combined and copied, a final document determining means determines whether or not the final document is an odd-numbered sheet; In copying the original document, when the center of the length of the copy paper in the conveying direction reaches the transfer section, outputting a control signal to the copy paper conveying means to stop conveying the copy paper, and A control signal for separating the copy paper from the photoreceptor is output to the above-mentioned separating means, and the second
outputs a control signal for bringing the copy paper into contact with the photoreceptor to the separating means when the surface portion of the photoreceptor corresponding to the start of exposure of the original reaches the transfer section; and control means for outputting a control signal for conveying the copy paper, and when the final document determining means determines that the final document is an odd-numbered sheet, the control means outputs a control signal for conveying the copy paper. An electrophotographic copying machine characterized in that a control signal is output to the above-mentioned copy paper conveying means and separating means so as to make copies onto one sheet of copy paper.