JPS609246B2 - Copy machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine having a document stacking area for two screens, a first screen and a second screen.

In the conventional copying machine, there was no copying machine that had a document placement area for two screens and separately exposed and optically scanned the document placement area for two screens.

Therefore, in conventional copying machines, when it is desired to obtain copies of two screens, after the first screen has been exposed and scanned, the original must be replaced and the second screen must be exposed and scanned. Therefore, in the present invention, the document layer area for two screens of the document table is
It is an object of the present invention to provide a copying machine which can perform exposure optical scanning without moving the original table and is extremely easy to operate.

The present invention will be described in detail below with reference to one embodiment.

This embodiment is a transfer-type electronic copying machine that employs a document table fixation system and can easily copy even thick Minamoto bridges and three-dimensional objects.

The operation of the copying machine will be explained with reference to FIG.

The original 3 is placed on the transparent plate 2 of the original table, and the optical system is composed of movable reflection mirrors 4, 5, lenses 7, and fixed reflection mirrors 8, 9.

That is, the original 3 is kept with the same optical path length by the movable reflection mirror 4 that moves together with the illumination lamp 6 and the movable reflection mirror 5 that moves in the same direction at 1/2 the moving speed of the movable reflection mirror 4. Further, the light is subjected to slit exposure through a lens 7 and fixed reflection mirrors 8 and 9, and is imaged onto the drum 1. The surface of the drum 1 is composed of a photoreceptor with a photosensitive layer covered with a transparent insulating layer, and the photoreceptor is first positively charged by a positive charger 11 supplied with a positive high voltage current from a high voltage power source 10.

Subsequently, upon reaching the exposure section 12, the original 3 on the transparent plate 2 of the original table is illuminated by an illumination lamp 6, and is imaged onto the drum 1 by movable reflection mirrors 4, 5 and fixed reflection mirrors 8, 9 with a lens 7. . The photoreceptor is exposed to an original image and at the same time is connected to an AC discharger 13 which is supplied with an AC high voltage current from a high voltage power source 10.
receives an alternating current discharge. Next, the entire surface is exposed by the entire surface exposure lamp 14, and an electrostatic image is formed on the surface of the photoreceptor drum, which enters the developing device 15. Development is performed by powder development using a magnetic sleeve method, and the electrostatic port image is converted into a coin image.

Next, the copy paper 17 sent from the cassette 16 is brought into close contact with the drum 1.

The transfer charger 18 positively charges the copy paper from the high voltage power supply 101 and transfers the image on the drum 1 onto the copy paper. After the transfer, the copy paper is separated from the drum 1 by a separating section 19 and guided to a fixing section 2.

On the other hand, the remaining toner on the drum surface (photoreceptor) is cleaned by the compressed blade 21, and the next cycle can be repeated again. Based on the above-described configuration, the feature of this embodiment, which allows copying to be easily performed on both the front and back sides of copy paper, will be explained.

First, regarding the paper conveyance system, it is constructed so that the copy paper on which front side copying has been completed is guided back to the transfer device for back side copying without being ejected from the machine. That is, when copying the front side, the fixing device 20
The discharge roller 22 passes through the discharge roller 22, and the static eliminator 23
Copying paper advances while having excess charge removed by
The passage of the rear end is detected by the light receiving element 24, and the ejecting roller 22 is reversed to guide the paper to a passage 26 for copying the back side. The guide plate 26 moves the passage 25 simultaneously with the reversal of the paper ejection roller 22.
It moves to the position where it guides the copy paper, and the copy paper is transported. rollers 27 and 28 to stop near register rollers 29. Next, the copy paper moves to the register roller 2 again to copy the back side.
The sheet is sent to the transfer device under the control of the paper feed signal 9, and after the transfer is completed, the sheet is discharged onto the tray 30 by the sheet discharge roller 22 via the fixing section 20 and the static eliminator 23.

Next, the operation of the optical system during double-sided copying will be explained with reference to FIGS. 2 and 3.

The document table of this embodiment has a size that covers A3 size, and a case where a double-sided copy of an A4 size book is to be made on A4 size copy paper is taken as an example.

The manuscript side is in the center, A side and B side (each A4 size)
It is divided into two sides of A4 size paper and can be placed on the document table at the same time.

First, the case of A-side copying will be explained with reference to FIG. 2.As in a normal copying machine, the starting position of the intersecting illumination section and mirrors 6 and 4 is immediately in front of the A-side document table, and the photosensitive drum is controlled. It starts with the start signal and starts the exposure process for the A side. When the exposure is completed, the mirror and illumination parts 4 and 6 of the optical system start.
stops at positions 4a and 6a.

At this time, the movable reflection mirror 5 also moves to the position 5a.

Next, explaining the case of side B copying with reference to FIG. When this is completed, the optical system stops at positions 4c, 5c, and 6c.

The length of the exposure stroke for the A side (the same is true for the B side) is the length 1 of the A side plus the allowance for the slit, the start of the movement, and the movement.

Therefore, the optical system is at the stop positions 4a, 5a, 6a shown in FIG.
become. Therefore, when copying of side A is completed and copying of side B is to proceed, it is necessary to move back the optical systems 4, 5, and 6 to match the optical system start positions 4b, 5b, and 6b for copying of side B. Similarly, when moving to A-side copying after the B-side copying is completed, the optical system is moved to the starting positions 4, 5, 6 of the optical system shown in FIG.
The feature of this embodiment that needs to be met is that it is easy to copy both the front and back sides of each copy sheet, and it is easy to realize an apparatus that automatically copies the front side and then the back side.

Next, by determining these sides A and B to be the document matching layer surface for front side copying and the document matching layer surface for backside copying, side B can add the following convenient features.

Utilizing the fact that the optical system start positions for A-side copying and B-side copying are different, it is possible to output a signal and carry out the following operations.

When making an A-side copy, it is first indicated that it is a front copy.

Further, after the copying is completed, an instruction or warning means is provided so that the copy paper is set in the paper feeding state for backside copying.

Alternatively, it may be further automated to set the paper feeding state for back-side copying after copying is completed.

In other words, the copy paper that has been copied is not discharged from the discharge roller, but is reversed and placed in the back side copy paper feeding state. Also, when copying the B side, it is first displayed that it is a back side copy.

Furthermore, after copying is completed, an instruction or warning is issued to discharge the copy paper onto the tray, or the copy paper is actively automated and discharged onto the tray.

In this way, it is possible to improve operability by changing the display and operation of the copying machine for A-side copying and B-side copying.

Generally speaking, there are two types of books: right-bound and left-bound, as shown in Figure 8. In both cases, the front side of each sheet of paper is an odd-numbered page, and the back side is an even-numbered page.

It is customary. Therefore, by placing odd-numbered pages on side A and even-numbered pages on side B, there is no distinction between right-hand binding and left-hand binding, and in either case, error-free double-sided copying is possible. In this case, the books are left binding a, b, right binding c, as shown in Figure 8.
d causes him to be hawked upside down. This is also A,
One of the advantages of setting the B side to be a front copy and a back copy is that convenient instructions can be given for operation. In addition, if copies are made in the order of A-side copying, B-side copying, that is, front-side copying, then back-side copying, in this embodiment, the copied paper is stacked on the tray with the back side facing up, so there is no contribution. It is extremely convenient to have them in order.

Although this embodiment has been described above using a copying machine with a stationary document table moving type, the present invention is not limited to this at all; in a case of a copying machine with a reciprocating document type, the document table can be relatively used for both sides A and B. Moreover, it is applicable not only to the transfer type copying machine but also to all types of copying machines having an original platen, such as the electrofax type copying machine. Next, during surface copying, the copying machine passes through the fixing device 20, is conveyed by the ejection roller 22, and is removed from excess charge by the defroster 23. The mechanical operation when the paper 22 is reversed and guided to the back side copying passage 25 will be explained in more detail with reference to FIG.

First, the fixing device 20' adopts a fixing method using a so-called heat roller, and its structure includes a heater 45 at the core and a freely rotating heating roller 41, the surface of which is covered with silicone rubber. ing. A fixing roller 42 has a heater 44 at its core and is supplied with heat by a freely rotating pressure roller 43.

The transferred copy paper is sandwiched between a heating roller 41 and a fixing roller 42 and fixed thereon, and then guided to a discharge roller 22.
At this time, a scraper 46 is used to prevent the fixed copy paper from wrapping around the fixing roller 42 and the heating roller 41.
and a separation claw 47 are provided. Next, how the discharge roller 22 is rotated forward and reverse will be explained.

First, when the discharge roller 22 is rotating in the direction of arrow A, the electromagnetic clutch 53 is on and the electromagnetic clutch 54 is off. 51 is rotated by the discharge roller shaft 5 via an electromagnetic clutch 53.
7 can be conveyed.

Next, when the discharge roller 22 reverses in the direction of arrow B, the electromagnetic clutch 53 is turned off and the electromagnetic clutch 54 is turned on, and the sprocket 5 rotates in the direction of the arrow by the chain 5.
2 is transmitted to a gear 56 via an electromagnetic clutch 54, and then a gear 55 fixed to a discharge roller shaft 57.
, the discharge roller 22 rotates in the B direction. Now, the copy paper that has passed through the fixing device is conveyed by the discharge roller 22 and the discharge roller 48 that follows it.

A light receiving element 24 and a lamp 49 as a light source are used to pass the trailing edge of the copy paper. When the trailing edge of the paper is detected electrically by the paper trailing edge detection mechanism, the electromagnetic clutch 53, which had been on until now, is turned off, and the electromagnetic clutch 54, which had been off until now, is turned on, and the trailing edge of the copy paper is detected electrically. The discharge roller that was holding the paper in its mouth reverses. At the same time, the swinging lever 61 is normally pulled by the spring 601, and accordingly, the guide plate 26 (fixed to the shaft 62, to which the swinging lever 61 is fixed) also moves as shown in FIG. The state is maintained as shown by the solid line shown. Information board 2
6 is displaced around the shaft 62 to the position shown by the dotted line in FIG. Stop at. Next, copying operations when using this copying machine will be explained in detail with reference to FIGS. 4 and 5.

This is to enable the copying machine to be used with the main switch.

31 has a copy number setting dial, and by aligning the scale of the dial with the index, it is possible to set from 1 to 9 nephews,
A number indicator 32 indicates the number of copies that have been made.

34 is a copy start button when copying multiple copies, and when you wish to copy only one copy, press another copy start button 35 and the number of copies set dial 3 is pressed.
Only one copy is made regardless of the instruction in step 1.

Reference numeral 36 is a shading selection dial for determining the darkness or lightness of the image, and 37 is a selection dial for copy types such as A-side, B-side, single-sided, and double-sided (AB) copying.

Here, "for side A" means that when this dial 37 is set to A, indicator lamp A lights up and only side A of the document table is copied, and when copying a single sheet, the copy paper is not ejected to the output tray but the 7th side. As shown in the figure, after the trailing edge of the copy paper is detected by the light receiving element 24, it is guided to a path for back side copying by the action of a solenoid 58 and clutches 53 and 54, and stopped at a preparation position for side B copying. However, when copying a large number of sheets, the copy sheets that have been copied, except for the first one, are ejected to the SE paper tray 301 as they are. Next, for B side, when dial 37 is set to B, indicator lamp B lights up.
After copying is completed, regardless of whether only side B of the document table is copied and multiple copies or single copies are made, the copy paper is placed in the 9E paper tray 3.
It is discharged into the river. If the dial 37 is set for one side, neither indicator lamps A nor B will light up. As with conventional copying machines, copies up to A3 size can be made on one side of the copy paper, and the copy paper that has been copied on one side is ejected to the pseudo paper tray 301 as is. Next, when the dial 37 is set for AB, the copying process for side B is automatically started after side A has been copied, and after side B has been copied, the brochures are automatically discharged to the brochure paper tray.

Furthermore, double-sided copying can be performed continuously even if the copy number set is large. This operating method provides various conveniences regarding double-sided copying.

For example, when copying both the front and back sides of a manuscript, such as the pages of a general book, there are cases where the front and back sides cannot be placed on the front side of each manuscript at the same time. Even in this case, when you open a book and place it on the manuscript table, as when copying several consecutive pages of a book, and each opened page is placed on its own manuscript layer, first turn the selection dial 37 to B. For face 1
Copy the original on side B onto the back of the second sheet of copy paper and eject it.
Next, the selection dial 37 is set to side A, and the original on side A is copied onto the front side of the second copy sheet.

Turn over one page of the book, set dial 37 for side B, copy to the back of the second copy paper, then set dial 37 for side A,
Copy on the back side of the 3rd copy paper, turn over one page of the book, use the dial 37 for side B, copy on the back side of the 3rd copy paper, then set the dial 37 for both A and copy on the 4th copy paper. If you copy on the back side, the two sides of the manuscript placed on the manuscript podium will not be copied on both sides of the same copy paper, but on one side of the first copy paper and on the second copy paper. It will be copied on the other side.

However, even in this case, the two sides to be copied are placed on the document table at the same time. Also, in this case, as mentioned above, it is necessary to set the manuscript on the paper board side so that the odd numbered pages of the book are on side A and the even numbered pages of the book are on side B to save operational effort. .

Also, to determine whether sides A and B are being copied to either page of the book on the draft stand, specimen lamps are lit near side A and side B as 39 for both sides A and 38 for side B, respectively. So it can be easily identified.

Next, if the two sides of the original can be separated and placed on sides A and B on the document table at the same time, and you want to copy them onto both sides of a single sheet of copy paper, you can perform double-sided copying as follows. .

First, set the required number of copies using the number setting dial 31, then use the selection dial 37 for AB and press the copy start button 34 to automatically make the required number of double-sided copies.

At this time, since both indicator lamps 39 and 38 of both A and B are lit, it can be confirmed that double-sided copying is being performed automatically. As described above, one of the features of this copying apparatus is that it can perform double-sided copying without any operational complexity in any case where double-sided copying occurs. Next, the electrical control method in this embodiment will be explained using the previous embodiment.

FIG. 9 is a block diagram in which devices related to control are divided by function. First, 101 is a drum home position set when turning on safety equipment such as a power input unit, door switch, shirt off in case of a jam, etc.
It also includes various reset devices for resetting the control circuit, etc., which will be described later, and, if necessary, a warm-up setting device. Next, 103 is a cassette similar to the conventional device;
This is a device to confirm the refilling of transfer paper, developer, and other depleted items. Further, 105 includes a copy selection dial, a copy number setting dial, a copy start button, and a copy stop button. Signals from these three parts are input to the central control unit (hereinafter referred to as CPU) of 107, which generates operation command signals to various operation parts for copying.
It can be further divided into the following five parts. First, 109 is a part that selectively commands various copying operations set by 105, which includes a drum copy rotation command. Further, reference numeral 111 is a part that generates a conveyance rotation command signal which is further required after the developing process of copying. Next, 113 is a part that generates commands to move the optical system, ie, forward, backward, and stop, and 115 is a part that generates a command signal to set the transfer paper in the preparation position for backside copying.
Reference numeral 17 denotes a device that feeds transfer paper from a preparation position or, in normal times, a cassette to a transfer position. As above, C
The PUI07 issues operation command signals to each operation execution section. Reference numeral 121 includes elements in the operation execution unit that do not require feedback to the CPUI 07, such as an original irradiation lamp, a high-voltage power supply, a paper feed operation unit, etc., as in a conventional copying machine.

Reference numeral 123 denotes a drum rotation operation unit, which includes a drum rotation position detection device at a necessary position, and its signal is fed back to the CPU 107. Furthermore, 125 is an optical system movement unit which similarly includes a position detection device and feeds back to the CPUI07. Reference numeral 127 denotes a transfer paper detection device, which is provided at a necessary location in the transfer paper circuit and generates a grade detection signal.
107. Next, 131 is a jam detection device,
This is to confirm the normal conveyance of the transfer paper, and is no different from that in the follower device.

Reference numeral 129 denotes various display devices, which are responsible for controlling necessary displays on the panel surface. Although the configuration has been briefly explained above, parts related to the present invention will be explained in more detail below with reference to the drawings. First, in Figure 10 a and b, 135,
Reference numerals 136, 137, 138, and 139 are position detection devices for the optical system 4, which are composed of microswitches, but other object detection devices such as photodetectors may be used in addition to this example.

Here, 135 also means the home position (start position) for one-sided copying or A-side copying, and 136 also means the starting position for B-side copying. Next, 138 also means the back position for single-sided half-size copying and A-side copying, and 139
also means the back position for single-sided full-size copying and B-side copying. Therefore, in the case of single-sided half-size copying, the optical system 4 advances from the position of the position detector 135 to position 138, and in the case of single-sided full-size copying, it advances from 135 to 139. Further, in the case of A-side copying, it is exactly the same as single-sided half-size copying, and in the case of B-side copying, it advances from position 136 to 139. Here, in this embodiment, assuming that the half size is an A-sized version and the full size is an A3 version, the positional relationship of each layer detection device may be as follows in order to effectively implement the present invention. That is, Figure jo a
The portion corresponding to 1 and the portion corresponding to 12 are made to match the width of the A needle slope size. Therefore, 13, which is the sum of 1 and 12, corresponds to the vertical width of the A3 size. Assuming that a document is placed at a position with the length indicated in each case, the movement range of the optical system that irradiates the document and derives the optical image signal reflected on the document image is 1, . It is most convenient to move with a little extra length than 12 and 13. In other words, the start position 135 or 136 has a distance margin of Q,,03 from the left end of 1, (or 13), or 12, respectively, and the back position 138 or i39 has a distance of 1,03, respectively. , Q2, Q4 from the right end of 12 (or 13)
It is better to allow some distance margin. Therefore, in this case, the start position 136 and the back position 138 are located apart from the center position and 140 by Q3 and Q2 to the left and right, respectively. Next, a signal generating device for counting the number of copies may be provided as an optical system position detecting device at the position indicated by 137 as shown in FIGS. 10a and 10b.

Conventionally, this type of signal uses a paper feed command signal to be described later, a paper detection signal in a transfer paper path, or a signal from another optical system position detection means or a drum rotational position detection device. In this embodiment, an optical system position detecting means located between 136 and 138 is provided to detect this signal, and the subsequent operation will be described using the signal as a copy count signal. By roughly matching this signal with the optical system advance execution signal, both signals are generated simultaneously only once per process when copying one-sided half-size, one-sided full-size, side A, and side B. This is convenient for subsequent operations. Further, in FIG. 1, reference numerals 24, 133, and 134 denote paper passage detection means, which can be composed of a lamp-photosensitive element bear or an ultrasonic transmitter/receiver bear, but in this embodiment, in order to avoid complication of explanation, this detection is simply used. The following explanation will be made assuming that the signal from the section is at /. level when paper is being detected, and is at low level when no paper is passing through.

Further, the positions of these paper passage detection units and the roles of signals from them in the sequence will be explained when explaining the picture paper operation and the preparation position setting operation. Next, although this circuit is a control circuit constructed mainly using digital logic circuits, the control circuit in this embodiment is not limited to this. First, in order to simplify the following explanation, the digital logic symbols and some circuit units used in this circuit example will be explained in advance. First, Figure 11-a 210 is a positive AND gate, and some have two input terminals, 211 and 212, or three or more terminals starting from 213. Those with two or more input terminals have either both or all three or more input terminals. When the terminal becomes high level, the output terminal 21
4 becomes a high level, and if there is even one low level, the output/output terminal 214 becomes a low level. Next, the 11th-
FIG. 216 shows an inverter, and when the input terminal 217 is at a high level, the output terminal 218 is at a low level, and when the input terminal 217 is at a low level, the output terminal 218 is at a high level.
Further, Fig. 11-c shows a positive OR gate having two input terminals 221 and 222, or three or more input terminals starting from 223, and if at least one of these input terminals is at /. The output terminal 224 becomes high level. Also, FIG. 111d shows a preset counter 200, and the overall function of this circuit is that when the data signal from the preset dial is connected to the input terminal 226, the input terminal 2
By inputting a preset command signal from 28, tenter numbers are set in the internal counter. Further, 227 is a clock input, and when a pulse is input from this terminal, the output of the internal counter becomes the data set from the terminal 226 minus the number of pulses. Terminal 231
is a terminal that outputs a level output when the output of the internal counter becomes 0, and 229 is a reset input terminal.
When a positive pulse is input from this terminal, both the set input and output of the internal counter are reset to 0. Also, terminal 23
This is the output terminal for displaying the counter output. The overall function of the brisset counter 202 is as described above and is used in the circuit of the present invention. In order to satisfy this overall function, internally, in addition to the above-mentioned counter circuit, a 0 detection circuit and an encoder for converting the 1G Hayabusa signal into a binary signal are included. Since there is no such thing, detailed explanation will be omitted. Next, the flip-flop circuit 233 in FIG. 111e used in the embodiment of the present invention is a D-type edge-triggered flip-flop, but is not limited to this. This D type edge trigger flip. The function of the top is that when a change from a low level to a high level is applied externally to the terminal 236,
From the output terminal 238, the data of whether the input terminal 235 is at the high level or low level at that time is output and held. In addition, the input state 234 is the reset input terminal. The output of the output terminal 238 is set to low level regardless of the input terminal of the CP. Moreover, the input terminal 237 makes the output terminal 238 a high level. Here, R. Generally speaking, most of the S input terminals perform their functions at a low level, but for the sake of simplicity, the following description will be made assuming that they function when the level is set to a high level. Also, the terminal 239 is the output terminal 23
It outputs the opposite level to 8. Next 1st 1-f
When a change from low level to high level is applied to the CP input terminal 241, the 1/2 frequency divider 240 in FIG.
43. When the level is low, it changes to a low level, and when it is a low level, it changes to a high level. Further, the R input terminal resets the Q output terminal 243, and when a high level is applied to the R terminal, the Q becomes a low level regardless of the CP input terminal 241. Therefore, first, a circuit example of the copy selection section 105 will be described.
To explain with reference to FIG. 2, first, the copy types in this embodiment can be divided into five types: single-sided half-size copy, single-sided full-size copy, double-sided A copy-duplex B copy, and double-sided automatic AB copy.

At this time, in the case of single-sided half-size copying or double-sided copying, half-size transfer paper must be fed. Therefore, if the paper feed cassette is half size, input terminal 14
5 is a high level, and if it is a full-size cassette, the input terminal 149 is set to /.
is at a high level, and in the case of “double-sided A”, 151 is,
Also, assuming that 153 is at a high level for "duplex B" and 155 is at a high level for "duplex automatic", and the others are at a low level, the output of the AND gate 181 is the half-size cassette signal and the single-sided copy signal. When both signals become high level, it becomes high level and AND gate 1
86 input terminals. Also, AND gate 182
The output becomes high level when the full-size cassette signal single-sided copy signal reaches the both/.-a level, and is connected to the input terminal of the AND gate 187. Furthermore, if the half-size cassette signal is at high level and A side copy, B side copy, or automatic copy is at high level, the output terminals of AND gates 1 83, 1 84, and 185 become /. are connected to the input terminals of AND gates 188, 189, and 190. Therefore, when performing the above five types of copying, if the dial and paper cassette are correctly set, the AND gate 181
, 182, 183, 184, and 185 becomes high level. Therefore, if the outputs of these gates are individually connected to the input terminals of the OR gate 197, the OR gate output will be at a low level if there is no output at the level /. In other words, this indicates that the dial and cassette are not set correctly, so O
When the output of the R gate 197 is connected to the input of the inverter 200, this output becomes a level, which can be used as the cassette/dial inspection indicator lamp lighting signal 1291a. Next, the preset counter has input terminal 16.
The data of the number of copies to be set from 1 is input to the PO terminal, and by pressing the copy start button, a high level is input from 159 to the PRS terminal, and thereby the Q terminal of the preset counter 202 becomes high level. Further, Q maintains the level until the input pulse from the CP terminal becomes equal to the set number of copies or until a stop command is received from the terminal 157. The output from this preset counter 202 is the AND gate 1.
It is added to other input terminals 86, 187, 188, 189, and 190. Therefore, at this time, in the case of single-sided half-size copying, the output terminal of AND gate 186 becomes high level, and in the case of single-sided full-size copying, the output terminal of AND gate 187 becomes high level.
, the output terminals of AND gate 188 for double-sided A, AND gate 189 for double-sided B, and AND gate 190 for double-sided automatic mode become high level, and a predetermined number of pulses are applied to the CP terminal of the preset counter. When the output Q becomes low level, it returns to low level. Therefore, AND gate 1 86, 187, 1 88, 189,
The outputs 190 can be used as single-sided half-size, single-sided full-size, double-sided A, double-sided B, and double-sided automatic copy command signals, respectively. Each unit executes a copy operation according to these copy commands, and an effective embodiment of the present invention may be specifically as follows.

In other words, although it overlaps with the above, the copy selection dial is set to "single-sided".
When the paper cassette is half-size, half-size copying is performed, and when the paper cassette is full-size, full-size copying is performed in exactly the same way as a conventional copying machine. Rotation, movement of the optical system, and paper feeding.The timing relationship will be briefly explained.Figure 10b
, 2 is a photosensitive drum, 1 is a microswitch for detecting the rotational position of the drum, 403a, 404a, 403b
, 404b are cams attached to the drum, and the respective positions are detected by pushing up the lever of the micro switch 1. Also, the drum rotates in the direction of arrow 405, but now a half-size copy command is issued.
When this occurs, if the cam 403 on that drum is in position 1 at that time, copy rotation of the drum starts. Next, when the cam 404a reaches the position 4001, the optical system
At position 35, start moving forward. During this forward movement, the original is exposed to light, and when it reaches position 138 (the exposure process) ends, and the optical system begins to move backward. Also during that time 137
When it reaches the position, it outputs one clock pulse to the preset counter mentioned above. In addition, the paper feeding process for transfer paper is started at 141 shown in FIG. 10b (however, both sides are
Only in the case of copying, when the copy reaches the position 141'), it is done mechanically. Therefore, if the copy execution corresponds to the last one of the designated number, the copy command is canceled by the time the optical system reaches position 138. Next, the rotation of the drum (
403b), if there is still a copy command, the copying process is executed in exactly the same way as when starting from the position 403a. However, in this case, the cam 404b corresponds to the cam 404a.

Next, in the case of full size, the cams 403b and 404b are irrelevant, and the copy operation always starts at position 403a, and the optical system retraction start position is 403a, but other operations are the same as half size copy. be. Next, when the rotational position of the drum reaches position 403a or 403b in the case of a half-size copy, or if there is no longer a copy command when it reaches the position 403a in the case of a full-size copy, the drum immediately starts the transport rotation. becomes. In this transport rotation, the optical system and paper feeding operation remain stopped. Further, at this time, if there is no copy command again, it is not inconvenient to stop the drum when the position of the drum 403a reaches the twice-split position 401, except when the conveyance rotation starts. During this time, the last copy of the transfer paper is completely ejected. As mentioned above, in the case of single-sided copying, there is no major difference from conventional copying machines. Next, regarding double-sided copying, a specific example can be made as follows. First, in the case of double-sided A copying, the copying operation is exactly the same as single-sided half-size copying, but if there is no subsequent duplex A copy command, in the duplex A copy execution process, the transferred transfer paper is not ejected and is printed on the reverse side. is introduced into the copy preparation position. Here, when the transfer paper is introduced into the preparation position, whatever type of copy is to be made next, the paper is fed from the preparation position. Next, in the case of double-sided B copying, the difference from the case of single-sided half-size copying is that the exposure of the original is performed in the range of 136 to 139 in the movement of the optical system in FIG. 10a. At this time, any type of copy
After the optical system has finished moving forward, if the double-sided B copy command has already been output, the retracting stops at position 136 to prepare for the double-sided B copy execution. Also, when the optical system is at position 135,
When the double-sided B copy command comes, the drum 403a to 4
The copying rotation may be started after carrying out the conveyance rotation for half a rotation from 03b or 403b to 403a. In the meantime, the optical system can be advanced from position 135 to position 136 and can be put on standby for double-sided B copying.
Next, in the case of double-sided automatic copying, first issue the A-side copy command, and then automatically issue the double-sided B copy command after the optical system passes the sliding door point (i.e., position 137 while moving forward). I can do it. By disassembling the execution of double-sided automatic copying as described above, an example of the implementation circuit will be explained by returning to FIG. 12 again. First, as for the clock pulse input to the preset counter 202, the pulse generated at the position a137 in FIG. do)
By connecting , it is possible to use the signal from the output terminal. Therefore, to further divide the double-sided automatic copy into double-sided, A, and B copies, the following can be done. First, the output of this AND gate 195 is connected to the CP terminal of the flip-flop circuit 203, and the D terminal is connected to the A side copy execution latch (the generation process will be described later, but this means that the A side copy is being executed. ) and a double-sided automatic copy command are connected to the input terminals of an AND gate 193, and their outputs are connected. When there is a double-sided automatic copy command, the output terminal Q becomes high level when the optical system moves forward while copying side A and passes the position a137 in Figure 10, and the output terminal Q becomes high level due to the advance of the optical system while copying the next side B. , returns to low level upon generation of the output of AND gate 195. Therefore, the Q terminal and the output from the Q terminal which outputs a signal opposite to the Q terminal are connected to one input terminal of AND gates 191 and 192, respectively, and the double-sided automatic copy command signal (the output of AND gate 190) is connected to the other terminal of each. ) is connected to 191
, 192 can be respectively a double-sided B copy command and a double-sided A copy command during double-sided automatic copying. That is, when a double-sided automatic copy command is generated, Q of the flip-flop 203 is initially at a high level, so the output of the AND gate 192 becomes a high level. This first commands double-sided A copy, and by that command, the A side copy execution latch shell 0, 167 is /
・The Q level of 203 becomes the /・ level while the optical system is moving forward. Therefore, at that point, a double-sided B copy command is generated, and A and B side copies are automatically executed in order.

Therefore, by connecting the outputs of AND gates 191 and 192 to one input terminal of OR gates 199 and 198, respectively, and connecting the outputs of AND gates 189 and 188 to the other input terminals,
The outputs of 8 can be used as double-sided B and double-sided A copy command signals, respectively. That is, the terminals 169, 171, 167, 173 in FIG. 121a are respectively /.
When the copy level is at the double-sided copy level, single-sided half-size copy, single-sided full-size copy, double-sided A, and double-sided B copy commands are issued. next,
An example of a circuit for controlling the rotation of the photosensitive drum will be explained with reference to FIG. The high level output produced when the drum is lowered is taken as the drum home position A, and when it is 403b, it is taken as the drum home position B, and the next drum home position from the drum home position is the unit of drum rotation.

First, to explain the process of generating the single-sided half copy execution latch 214, the single-sided half copy command input from the terminal 169 is connected to the D terminal of the flip-flop circuit 233 and also connected to one input terminal of the AND gate 234. Therefore, when the drum home position signal coming to the other end of the AND gate 234 already exists or is generated, the Q terminal of the circuit 233 becomes the /. level, and a single-sided half copy execution latch is generated. However, here, the flip-flop circuit 231 and the AND gate 23
0. If the previous copy is a double-sided A copy, the transfer paper is set in the preparation position as described above by the inverter 229, so until it is set, the drum home position signal is is the AND gate 2
It will not be applied to other terminals of 34. That is, when the double-sided A copy execution latch of the output terminal 216 is at a high level and there is no single-sided A copy command of the input terminal 167, the AN
The output of the D gate 230 becomes high level and is output from the output terminal 218 as the back surface preparation position setting command signal as described above. The signal further enters the S terminal of circuit 231,
Although details will be described later, paper detection C indicates completion of preparation position setting.
Its output maintains a low level at the output terminal Q until the signal (PDPC) is input from the 217 terminal.
By connecting the output to one input terminal of each of the AND gates 232 and 229, even if the drum home position signal is generated during the preparation position setting, the circuit 2
No high level signal is input to the CP terminal of 33. Therefore, at this time, the next drum's home position signal will be generated after being input. However, at this time, the drum's home position signal will be the home position A
, B are both input via OR gate 228. However, in the next case of single-sided full-size copying, by directly connecting drum home position A to one input terminal of AND gate 232, drum home position B becomes irrelevant at this time, and single-sided full-size copying is performed. The execution latch generation operation is performed, but the other steps are exactly the same as in the case of the half-size copy execution latch.
5,215, resulting in exactly the same developmental process.

Next, the duplex A copy execution latch generation process does everything except that it is not necessary to prevent the home position signal from being input to the AND gate 238 for setting the ready position.
The process of generating a single-sided half copy execution latch is performed in exactly the same way as the process of generating a latch for executing a single-sided half copy.Furthermore, the process of generating a latch for executing a double-sided copy is generated in the same process as the process of generating a single-sided half copy execution latch. The copy execution latches for single-sided half, single-sided full, double-sided A, and double-sided B are set to high level and are output in accordance with each copy command. Next, as shown in Fig. 13-b, the outputs 214 and 216 are connected to the input terminal of the ○R gate 221, so that the optical system forward stop position is at the position shown in Fig. 10a, It is led to an output terminal 224 indicating a copy execution latch which should be in position 138, and is also connected to one input terminal of an OR gate 222. Also 222
The output of 215 is connected to the other input terminal of , and the output of 222 is further connected to one input terminal of OR gate 223 . Further, the output of 217 is connected to the other end of OR gate 223, and the output of OR gate 223 is ultimately led to output terminal 226 as a copy execution latch meaning all types, and is used for subsequent operations. Next, the transport rotation command (execution latch) 111 will be explained with reference to FIG.

Assuming that the copy execution latch CPL (hereinafter referred to as CPL) is at a high level and copy rotation is in progress, this signal is sent from the terminal 226 to the inverter 2.
58 to the input terminal of AND gate 252 as a low level. Therefore, its output also becomes low level, and the transport rotation command output terminal 259 becomes low level, and no command is issued. This output is further passed through an inverter 257 to an AND gate 256 and 1/2 as a no level.
It is connected to the R terminal of a frequency divider (bistable multipipulator: hereinafter referred to as BM) 215. In addition, in the flip-flop circuit 250, a drum home position signal is applied to the terminal CP, and at this time, a drum home position A signal (hereinafter referred to as DHPA) is applied directly to the OR gate 255 from the terminal 210, but the drum home position signal Since the home position B signal (hereinafter referred to as DHPB) is applied from terminal 211 to the other input terminal of 255 via AND gate 256, the output of OR gate 255 is DHPA,
When both DHPA and DHPA signals appear and the terminal 259 goes to /. level, only DHPB appears and the C of the terminal 250
added to the P terminal. In addition, this signal is further transmitted to inverter 2.
53, BM. It is also applied to the CP terminal of terminal 251 at the same time. Furthermore, an OR gate 2 is connected to the D terminal of the circuit 250.
The CPL signal is connected to one input terminal of the gate 254, and the output Q of the BM 251 is connected to the other end. Here, when the drum home position signal rises, the time it takes for it to reach the CP terminal of terminal 250 is much longer than the time it takes for CPL to change through various gates in the circuits shown in Figures 13-a and 13-b. early. Therefore, depending on the rise of the drum home position signal, the output Q of the circuit 250 may remain high level or/
- When CPL changes to low level due to the rise of the same drum's home position signal (hereinafter referred to as DHP), the terminal 259 becomes high level and issues a transport rotation command signal. This command is the following D
When CPL becomes high level at the rise of HP, AND
Although it is released by the gate 252, CPL during conveyance rotation
When does not rise, it is released in the following sequence, that is,
At this time, DHPB is set to 2 by the AND gate 256.
Although it is not applied to the CP terminal of BM.50, when the output of the OR gate 255 falls first, the BM. Since the reset signal of 251 has become low level and the reset has already been canceled, the output Q becomes low level. Therefore, next 250 C
When a voltage rising to a high level appears at the P terminal, the output of the OR gate 254 becomes a high level because of the output Q of the BM 251, although CPL is already at a low level. Therefore, the output Q of the circuit 250 at this time maintains the level. However, when the output of the OR gate 255 changes to a low level next time, the output Q of the BM251 becomes a low level, and at the next rise of DHP, the output of the OR gate 254 becomes a low level, so the output of the circuit 250 becomes a low level. The conveyance rotation command of the terminal 259 is canceled. Next, to explain the optical system movement command 113, in FIG. 15, the input terminals 265, 266, and 215 each receive the signal generated by the drum rotation described earlier using FIG. 10b, that is, the optical system movement start pulse A. (hereinafter referred to as OTSB), optical system movement start pulse B (hereinafter referred to as OTSB), and single-sided full-size copy execution latch (hereinafter referred to as F
(written as CPL) is input.

OTSA is connected directly to the input terminal of OR gate 275, and also to the input terminal of OR gate 275.
TSB is connected to OR gate 275 via AND gate 274.
and FCPL to the other input terminal of inverter 2.
73 to the other input terminal of AND gate 274. Therefore, an optical system movement start pulse signal is generated from the output of the OR gate 275. However, for single-sided full-size copying, only OTSA signals are output, and for other types of copying, both OTSA and OTSB signals are output. Input terminals 267, 268, 269, and 270' respectively receive signals from the optical system position detection device shown in FIG.
PA, OHPB), optical system back position A.
B (hereinafter referred to as OBPA, OBPB) is input. In addition, the input terminals 226, 173, and 224 each have a copy execution latch (CPL) and a double-sided B copy command (BCC).
P) Half stop copy latch (HSCL) signals are input. First, the input and output of the circuit 272 will be explained. When output Q becomes high level, AND gate 2
The optical system advance latch (OF
L) Output as a signal. However, since the output Q of the circuit 271 is connected to the other input terminal of the AND gate 280, when this output is at a low level, it is blocked by the gate 28, and the output terminal 284 becomes a low level and output Not done. Also, the output Q of the circuit 272 is AND
The signal is outputted to an output terminal 285 via a gate 281 as an optical system backward latch (OBL) signal. In addition, the output Q is at high level and the OFL signal is at the R terminal at the AND gate 28.
0, the optical system stops advancing and starts retracting. That is, the optical system back position signal is input as a reset signal in order to change the output Q from the low level to the low level. However, as this optical system back position signal, OBPB is OR.
Although it is input as is through the gate 283, OBPA is connected to the AND gate 282 and other input terminals.
It is input by the SCL signal. It is input via the OR gate 283 only in the case of single-sided half-size copy and double-sided A copy. Now CPL is at high level and terminal 22
6 to the D terminal of the circuit 272, the optical system is at the home position A and the terminal 269 is at /. 276, and when the output of the AND gate 276 becomes high level, each signal is connected to the input terminal of the OR gate 277, so its output becomes the /. Furthermore, since it is connected to the input terminal of the AND gate 278, the output of the OR gate 275, that is, the optical system start pulse, is input to the AND gate 278 as a clock pulse.
is input to the CP terminal of the circuit 272 from the output of the circuit 272 . Therefore, the output Q becomes high level and is output from the terminal 284 via the AND gate 280 as an OFL signal. now,
Assuming that the optical system is at home position A and the double-sided B copy command signal is input, the optical system moves forward as described above. When the home position B is reached and the OHPB signal is generated, the AND gate 276 becomes high level. When this is applied to the CP terminal of the circuit 271, the output Q, which has a high level applied to the D terminal as an 8CCP signal, becomes a low level. This is A
Since it is connected to the other input terminal of the ND gate 280, its output becomes a low level, and the forward command from the terminal 284 is temporarily canceled. Therefore, at this time, the optical system stops at the home position B, but when the next optical system movement start pulse is generated and applied to the R terminal of the circuit 271, the output Q returns to high level and starts moving forward again. .
Next, as described above, when the optical system generates an optical system back position signal from the output of the R gate 283 according to the type of copy being executed and applies it to the R terminal of the circuit 272, the output Q becomes a low level. The advance command is canceled. However, since the output Q becomes high level and is outputted as an OBL output via the AND gate 281, the vehicle starts moving backward. However, since the output of the OR gate is applied to the other input terminal of the AND gate 281 via the inverter 279, if the BCCP signal is at a high level, indicating that the next copy is also a double-sided B copy, the OHPB becomes high level, or when double-sided B copying is completed and the double-sided B copy command (BCCP) signal has already returned to low level, when OHPA becomes /...
The output of R gate 277 becomes high level, and a low level signal is applied from inverter 279 to AND gate 281, canceling the backward command. Next, FIG. 16 shows the drum drive latch (hereinafter referred to as DDL) of the terminal 286 that commands rotation of the drum.
As is clear from the previous explanation, this shows the output generation process of the output when the CPL is at the /- level or the transfer rotation command (hereinafter referred to as FIL) is at the high level. I come to do it.

That is, FIL and CPL are output from terminals 259 and 226, respectively.
is input and connected to the OR gate 283, and its output becomes DDL. Next, referring to FIG. 17, the process of generating the transfer paper feed command signal i17 will be explained.

First, a paper detection signal C (PDPC) is input to the input terminal 212 . As described in the explanation of FIG. 13-a, this signal indicates that the rear side copy preparation position has been set, and also indicates that there is a transfer sheet at the preparation position. Details regarding this PDPC will be described later. This signal is connected to one input terminal of AND gate 308 and inverter 307.
connected to the input terminal of Furthermore, pulse signals are inputted from the terminals 301 and 302 at positions 141 and 141', respectively, by moving the optical system as shown in FIG. 10b. These are arranged to provide paper feeding timing pulses for single-sided copying, double-sided A copying, and double-sided B copying, respectively. Also, each A
It is connected to one input terminal of ND gates 303 and 305. Also, a double-sided B copy execution latch signal is input from the terminal 217, and the AND gate 305 and the inverter 304
is connected to the other input terminal of AND gate 303 via. Further, an optical system advance latch signal is inputted from the terminal 284 and connected to one input terminal of the AND gate 310 . Therefore, the PFSB signal is input to the OR gate 306 via the AND gate 305 during double-sided B copying, and the PFSA signal is input via the AND gate 303 during other copying. Furthermore, this OR gate 30
A paper feed start signal outputted through the gate 6 is connected to one input terminal of an AND gate 310. Also, since the OFL signal is input to the input terminal of the AND gate 310,
PFSA or PFSB generated when the optical system advances is output from the output terminal of the ND gate 310, and the terminal 34
2 to other circuits as a paper feed timing pulse (PFSP), and is further connected to one input terminal of an AND gate 308 and an AND gate 309. Therefore, at this time, if paper is set in the back side paper feed preparation position, the output from the AND gate 308 is output as the terminal 34 river preparation position paper feed command, and if no paper is set in the preparation position, the AND gate 308 A signal is output from the output of the gate 309 to the terminal 341 as a cassette sheet feeding command. Next, the process of generating the preparation position set command signal will be explained. First, in FIG. 1, in order to effectively carry out the present invention, when a preparation position set command signal is generated (in this example, terminal 28 in FIG.
1 output) The transfer paper can be set in the preparation position through the following process.

First, when the transfer paper passes through the fixing device 20 and is moved toward the tray 30 by the scarlet paper roller 22, the paper detection device A2
After the passage of the transfer paper is confirmed by step 4, the transfer paper is moved to the pseudo paper roller 22 with the transfer paper held in the 9E paper roller 22.
After the rotation of the transfer paper is stopped and the guide plate 26 is moved and the lateral shift correction control is completed, the rollers 22 and 27 transport the transfer paper at high speed in the direction of the roller 28, and the leading edge of the transfer paper is detected by the paper detection device C134. be done. As a result, this high-speed preparation position setting rotation is stopped, and in response to the preparation position paper feeding command, normal rotation is performed this time and the sheet is conveyed to the transfer position via rollers 28 and 29. However, the conveyance method for the preparation position is not limited to the above method. For example, a paper detection device B133 is provided between the conveyance rollers 28 and 29, and after the paper is conveyed to that position by high-speed preparation position setting rotation, the rotation It is also possible to consider a method such as stopping the paper and feeding the paper in response to the next preparation position paper feeding command. However, the timing at which the paper reaches the transfer position must be the same whether the paper is fed from the preparation position or from the cassette.
Don't cry. In this embodiment, when the leading edge of the paper reaches the position of the paper detection device CI34 located between the rollers 27 and 28, the high-speed preparation position setting rotation is stopped, and from that position,
Taking as an example the case where the normal transport time of the transfer paper to the roller 28 and the time for the transfer paper to arrive at the loaf 28 after the paper feed command signal is generated and the paper is fed from the cassette, the 18th
The circuit shown in the figure will be explained. First, the double-sided A copy execution latch signal is input from the input terminal 216 to the D terminal of the circuit 346, and the preparation position set command signal (PPSC) is input from the terminal 218 to the CP terminal of the circuit 346. Therefore, the output Q of the circuit 346 holds the signal PPSC and remains at a high level.

This output is connected to one input terminal of AND gate 350, and the other input terminal is connected to paper detection A24 from terminal 345.
When the signal rises, the output becomes high level and is input to the CP terminal of the circuit 351. At this time, since the signal from the paper detection signal C is applied from the terminal 212 to the D terminal of the circuit 351 via the inverter 349, if there is no transfer paper at the position of the paper detection device C, the output Q of the circuit 351 will be /・becomes a level. This output indicates that the transfer paper to be subjected to double-sided A copy and set in the preparation position is detected by the paper detection device A.
This indicates that the vehicle is currently passing through the section. This world power is first input to the R terminal of circuit 346 to reset its output Q, and is also connected to one input terminal of AND gate 352. Therefore, at this time, when the transfer paper passes through the paper detection device A and the PDPA signal becomes low level, it is connected to the other input terminal of the AND gate 352 as a rising signal to high level via the inverter 348. has been done. At this time, the output is input to the CP terminal of the rising circuit 355. At this time, the D terminal of the circuit 353 has a PD
Since the PC signal is applied via the inverter 349, it is at a high level, and the output Q is at a /. At this time, the circuit 351 receives the output of the circuit 353 at its R terminal and is reset. Next, when the transfer paper reaches the position of the paper detection device C, the PDPC goes to the '-- level and is input to the R terminal of the circuit 353, the output Q is reset, and the HPFC is released. An example of an electric control circuit for carrying out the present invention has been described above, but details have been omitted from the following to avoid complicating the explanation.

The first is to reset all outputs of each flip-flop when the power is turned on, and to generate detection signals in each layer detection device by using contact-type switching elements such as microswitches. However, the explanation of the use of chattering prevention circuits in all of these has been omitted, and the driver circuits of each device driven in accordance with each command have also been omitted. Furthermore, the control circuit according to the present invention is by no means limited to the circuit described here. As described above, the present invention provides a copying machine that can perform exposure optical scanning for two screens without moving the document recording table, and has excellent operability.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus showing one embodiment of the present invention, and FIG.
Figures 3 to 3 are explanatory diagrams showing the relationship between double-sided copying and the optical system, and Figure 4
The figure is an external view of the same device, FIG. The figure is an explanatory diagram of the military history in the case of right binding and left binding of manuscripts such as books, Figure 9 is a block diagram of the electrical control system of this embodiment, Figure 10 is an explanatory diagram of the position of the optical system and paper feed control, FIG. 11 is an example of a digital logic circuit used in this embodiment, FIG. 12 is a circuit diagram of a copy selection section, and FIG. 13 is a circuit diagram of a copy selection section.
The figure is a circuit diagram for controlling the rotation of the photoreceptor drum, Figure 14 is a circuit diagram for the transport rotation command (execution latch), Figure 15 is a circuit diagram for controlling the movement of the optical system, and Figure 16 is for driving the rotation of the photoreceptor drum. , FIG. 17 is a circuit diagram for controlling the sheet feeding of the transfer material, and FIG. 18 is a circuit diagram for controlling the sheet feeding preparation. Younger brother'tu rust Z Kan・31st seal 4th figure 5th round 69 Ongu bottle tangle 2 group q! Gentsutomu'0zu (4) Son'0zuku b) Mai l - Zuzurin l2l2 *13121 (Q) *'319 Hoshigami 14th week 15-2 Shizutane 2 Rakutanegun Shigen poem

Claims (1)

[Scope of Claims] 1. A stationary document placement table having a document placement area for two screens, a first screen and a second screen, and provided with a center reference position that aligns the centers of the two screens; and the stationary document placement table. a moving scanning optical system that moves along the document mounting table and optically scans the surface of the original placed on the document mounting table; Furthermore, a first optical system scanning start position corresponding to a predetermined distance upstream position, a second optical system scanning start position corresponding to a predetermined distance upstream position from the center reference position, and from the first optical system scanning start position, The moving scanning optical system performs exposure optical scanning of the first screen, and after completing the exposure optical scanning of the first screen, moves the scanning optical system backward, and then exposes the second screen from the second optical system scanning start position. After performing optical scanning and exposing the second screen, the scanning optical system is moved back and returned to the first optical system scanning start position, and the image of the document placed on the first screen and the second screen is scanned. A copying machine characterized by copying images corresponding to different images on different transfer materials (on both sides of the same transfer material or on two surfaces of two transfer materials). 2. A stationary document placement table that has document placement areas for two screens, a first screen and a second screen, and a center reference position that aligns the center of the two screens; a moving scanning optical system that optically scans the surface of the document placed on the document mounting table; and a moving scanning optical system that optically scans the surface of the document placed on the document mounting table; an optical system scan start position corresponding to the position; and from the optical system scan start position, perform exposure optical scanning of the document placement area of the first screen by the scanning optical system, and after completion of the exposure optical scan of the first screen, After the scanning optical system is moved back to the above-mentioned optical system scanning start position, it is moved forward again to perform exposure optical scanning of the document placement area of the second screen, and after completing the exposure optical scanning of the second screen, the scanning optical system is moved back again. The optical system is moved back and returned to the scanning start position, and the image corresponding to the image of the original placed on the first screen and the second screen is transferred to different sides of the transfer material (both sides of the same transfer material or two sheets of the same transfer material). A copying machine is characterized in that it makes copies on each side of a transfer material.