JPS5921029B2 - double-sided copying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-sided copying apparatus that can automatically form transferred images on the first and second sides of copying material.

Conventional duplex copying devices (e.g., U.S. Pat. No. 36151
No. 29), when the copying material has been transferred to the first side, the copying material is set on an intermediate tray so that the copying material can be transferred to the second side in the same transfer section. However, copying was interrupted and the printer was placed on the intermediate tray.

Therefore, in order to make continuous copies on both sides of the copy material, the first
It is necessary to enter a copying command for the second side in anticipation of the completion of copying according to the side copying command, which requires a lot of effort on the part of the operator. In order to eliminate such drawbacks, the present invention makes it possible to copy onto the first and second sides of a copying material without interrupting the copying, thereby reducing the operator's operations. .

However, in this case, in order to continuously copy the first and second sides, if you simply switch the paper feeding operation after copying is complete, the paper feed operation may be idle even though there is no copy material in the intermediate tray, or the copy material may be placed in an inappropriate position. Sometimes I make two copies.

The object of the present invention is to eliminate this drawback as well, and to enable accurate, uninterrupted copying to the first and second sides.

Another advantage is that it is possible to arbitrarily select between interruption after copying to the first side and copying without interruption to the first and second sides. 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 fixing system and can easily copy thick originals 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 optical path length of the document 3 is kept equal by the movable reflective mirror 4 that moves together with the illumination lamp 6 and the movable reflective mirror 5 that moves in the same direction at half the moving speed of the movable reflective mirror 4. However, the light is further 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 having a photosensitive layer covered with a transparent insulating layer, and the photoreceptor is first positively charged by a positive charger 11 to which a positive high voltage current is supplied from a high voltage power source 10.

Subsequently, upon reaching the exposure section 12, the document 3 on the transparent plate 2 of the document table is illuminated by the illumination lamp 6 and is imaged onto the drum 1 by the movable reflection mirrors 4, 5, the fixed reflection mirrors 8, 9 of the 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 latent 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 latent image is visualized.

Next, the copy paper 17 fed from the force set 16 is brought into close contact with the drum 1.

The transfer charger 18 positively charges the copy paper using the high voltage power supply 10 and transfers the image on the drum 1 onto the copy paper. The copy paper after the transfer is separated from the drum 1 by a separating section 19 and guided to a fixing section 20.

On the other hand, the remaining toner on the drum surface (photoreceptor) is cleaned by the blade 21 pressed against it, and the next cycle can be repeated again. Based on the above-described configuration, the feature of the present invention, 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
, and is conveyed by the discharge roller 22 to 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 discharge roller 22 is reversed to guide the paper to the back side copying passage 25. The guide plate 26 moves the passage 25 simultaneously with the reversal of the paper ejection roller 22.
The copy paper is moved to a position where it guides the copy paper, and the copy paper is stopped near the registration roller 29 by the conveyance rollers 27 and 28. Next, the copy paper moves to the register roller 2 again to copy the back side.
The paper is sent to the transfer device under the control of the paper feed signal 9, and after the transfer is completed, it is discharged to the tray 30 by the paper discharge roller 22 via the fixing device 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 document placement surface is in the center, side A and side B (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 illumination section of the optical system and the mirrors 6, 4 have their starting positions immediately in front of the A-side document table, and are controlled by the photosensitive drum. When the exposure process for side A starts and 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, the case of side B copying will be explained with reference to FIG. When the exposure process ends, the optical system stops at positions 4c, 5c, and 6c.

The length of the exposure stroke for side A is the sum of the length 1 of side A, which is the same for side B, plus the slit width and allowance for interlocking start and stop.

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 be started, 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 completion of B-side copying, the optical system must be aligned with the optical system start positions 4, 5, and 6 shown in FIG.

The feature of this embodiment 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 original platen mounting surface for front-side copying, and the original platen mounting surface for back-side copying, the following convenient features can be added.

Utilizing the fact that the original platen start positions for A-side copying and B-side copying are different, a signal can be issued to carry out the following operations.

When copying side A First, it is displayed 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.

In addition, as shown in Figure 8, there are two types of books that are transported: right-bound and left-bound, but 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. There is.

It is customary. Therefore, if odd-numbered pages are placed on side A and even-numbered pages are placed on side B, there is no distinction between right binding and left binding, and in either case, error-free double-sided copying becomes possible. In this case, the books are left binding A, b, right binding C, as shown in Figure 8.
Due to d, the top and bottom will be turned upside down. This is also A,
One of the advantages of setting side B to be a front copy and a back copy is that convenient instructions can be given for operation. In addition, if the copying is performed 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 the pages are It is extremely convenient to have them in order.

Although the present invention has been described above using a copying machine with a stationary document table moving type as an embodiment, it is not limited to this at all, and if it is a copying machine of a reciprocating document type, the document table can be made to correspond to both sides A and B. , and can be applied not only to the transfer type copying machine but also to all types of copying machines having an original platen, such as electrofax type copying machines. Next, during surface copying, the copying machine passes through the fixing device 20, is conveyed by the discharge port roller 22, and is removed from excess charge by the static eliminator 23. is detected, and the reverse side copying path 2 is opened by reversing the discharge roller 22.
A more detailed explanation will be given in FIG. 7 regarding the mechanical operation when the robot is guided to the point 5.

First, the fixing device 20 adopts a fixing method using a so-called heat roller, and its configuration includes a heater 45 at the core and a freely rotating heating roller 41, the surface of which is covered with silicone rubber. There is. The 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 the discharge port roller 22.
At this time, a scraper 46 is used to prevent the fixed copy paper from wrapping around the fixing roller 42 and 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, and the chain 50 rotates the discharge roller shaft 57 in the direction of the arrow. The rotation of the sprocket 51 is controlled by the discharge roller shaft 5 via an electromagnetic clutch 53.
7 can be conveyed.

Next, when the discharge roller 22 is reversed in the direction of arrow B, the electromagnetic clutch 53 is turned off and the electromagnetic clutch 54 is turned on, causing the sprocket 5 to rotate in the direction of the arrow by the chain 50.
2 is transmitted to a gear 56 via an electromagnetic clutch 54, and then a gear 55 fixed to a discharge port 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 detect the passage of the trailing edge of the copy paper.
Consisted of. When the trailing edge of the paper is electrically detected 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. The discharge roller that was holding the paper in its mouth reverses. At the same time, the swing lever 61 is normally pulled by the spring 60, and accordingly,
The guide plate 26 (which is fixed to the shaft 62 and to which the swing lever 61 is fixed) is also kept in the state shown by the solid line in FIG. 1. The guide plate 26 is moved around the shaft 62 to the position shown by the dotted line in FIG. It stops near roller 29. Next, copying operations when using this copying machine will be explained in detail with reference to FIGS. 4 and 5.

40 is a main switch that enables the copying machine to be used.

31 is the copy number setting dial. By aligning the scale of the dial with the index, it is possible to set from 1 to 99 copies.
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 that determines the darkness or lightness of the image, and 37 is a selection dial for copy types of A-side, B-side, single-sided, and double-sided AB.

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. 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 the back-side copy passage by the action of the solenoid 58 and electromagnetic clutches 53 and 54, and is prepared for the B-side copy. Stop in position. However, when copying a large number of sheets, the copy sheets that have been copied, except for the first one, are ejected to the paper ejection tray 30 as they are. Next, for side B, when dial 37 is set to B, indicator lamp B lights up and only side B on the document table is copied.After copying is completed, regardless of whether it is multiple copies or one copy, the copy paper is ejected. Tray 3
Ejected to 0. When the dial 37 is set for single-sided printing, the indicator lamps will read A, . B Neither light is lit. 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 paper ejection tray 30 as is. Next, when the dial 37 is set for AB, side A is copied and side B is automatically copied, and after side B is copied, the paper is automatically discharged to the paper discharge tray.

Moreover, continuous double-sided copying is possible even when the number of copies is set to a large number. This operating method provides various conveniences regarding double-sided copying.

For example, when copying both the front and back sides of a document, such as the pages of a general book, there are cases where the front and back sides cannot be placed on respective document placement surfaces at the same time. Even in this case, when you open a book and place it on the document stand, as when copying several consecutive pages of a book, and each opened page is placed on its own document placement surface, first turn the selection dial 37. B side 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 the dial 37 for side B, copy it to the back of the second copy paper, then set the dial 37 for side A, 3
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 by copying on the back side, the two sides of the original placed on the document placement surface will not be copied on both sides of the same copy paper, but will be copied on one side of the lth copy paper and the second copy. It will be copied on the other side of the paper.

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, it is necessary as mentioned above to set the manuscript surface 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. be.

Also, to determine whether sides A and B are being copied to either page of the book on the manuscript table, the specimen lamps are lit near side A and side B as 39 for side 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, the required number of copies is set using the number setting dial 31, and then the selection dial 37 is set for AB and the copy start button 34 is pressed to automatically make the required number of double-sided copies.

At this time, since the indicator lamps 39 and 38 of both the Al and B sides 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 according to the present invention will be explained using the above embodiments.

FIG. 9 is a block diagram in which devices related to control are divided by function. First, reference numeral 101 sets the home position of the drum when turning on the power supply, safety devices such as the power input section, door switch, shirt off in case of a jam, etc.
It also includes various setting devices such as a control circuit resetting device, which will be explained later, as well as a warm-up setting device and the like if necessary. Next, 103 is a force set similar to the conventional device,
Transfer paper, developer, and other erasers. This is the refilling and replenishment confirmation device for the product. Further, reference numeral 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) 107, which generates operation command signals to various operation parts for copying.
07 can be further divided into the following five parts.

First, 109 is 105 which includes a drum copy rotation command.
This is a part for selectively instructing various copy operations set by the . 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, that is, forward, backward, and stop, 115 is a part that generates a command signal to set the transfer paper in the preparation position for backside copying, and 117 is the part that generates the preparation position or Normally, it is a device that feeds transfer paper from a force set to a transfer position. As described above, the CPUIO7 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 CPU 107, such as a document 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 moving unit which similarly includes a position detection device and receives feedback from the CPU 107. Further, reference numeral 127 is a transfer paper detection device, which is provided at a necessary location of the transfer paper circuit, and generates a paper 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 conventional devices.

Reference numeral 129 denotes various display devices, which are parts that control necessary display 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 Fig. 10, 135, 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 single-sided copying or A-side copying, and 136 also means the start position for B-side copying. Next, 138 also means the sharp position during single-sided half-size copying and A-side copying.
9 also means the back position during single-sided full-size copying and B-side copying. Therefore, in the case of a single-sided half-size copy, the optical system 4 moves forward from the position of the position detector 135 to the position 138, and in the case of a single-sided full-size copy, the optical system 4 moves forward from the position of the position detector 135 to the position 135.
Move forward from to position 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 A4 size and the full size is an A3 size, the positional relationship of each position detection device may be as follows in order to effectively implement the present invention. That is, the 10th
In Figure a, the portion corresponding to 11 and the portion corresponding to 12 are made to match the width of the A4 size paper. Therefore 11 and 1
The sum of 2, 13, corresponds to the vertical width of the A3 size. Assuming that the original is placed at the position of the length shown in each of these, the movement range of the optical system that irradiates it and derives the optical image signal reflected on the original image is slightly larger than 11, 12, and 13 in each case. It is best to move with extra length.
That is, the starting position 135 or 136 is 11, respectively.
(or 13), with a distance margin of α1 and α3 from the left end of 12, and back position 138 or 139.
are α2, respectively, from the right end of 11, 12 (or 13)
It is better to allow distance margin for α4. Therefore, in this case, the start position 136 and the back position 138 are located apart from the center position 140 by α3 and α2 in the left and right directions, 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 shown at 137 in FIG. 10a.

Conventionally, this type of signal is a paper feed command signal (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 signal from there is used as a copy count signal to explain the subsequent operation. By combining this signal and the optical system advance execution signal, both signals are generated simultaneously in the process when copying one-sided half-size, one-sided full-size, side A, and side B. 1
This is very convenient for subsequent operations.
Further, in FIG. 1, reference numerals 24, 133, and 134 indicate paper passage detection means, which can be composed of a lamp, a pair of photosensitive elements, a pair of ultrasonic transmitter/receivers, etc., 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 a high level when paper is being detected and is at a low level when no paper is passing through. Further, the positions of these paper passage detecting sections and the roles of the signals from them in the sequence will be explained when the paper feeding operation and the preparation position setting operation are explained. Next, although this circuit is a control circuit constructed mainly using digital logic circuits, the control circuit in the present invention 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, 11-a
Figure 210 shows a positive AND gate with an input terminal 211
, 212 have two terminals, or 213 and later have three or more terminals.For those with two input terminals, both or three or more terminals become high.When all terminals become high level, the output terminal 214 becomes high level. If there is a low level signal, the output terminal 214 becomes low level. Next, the first
1-b Figure 216 shows an inverter; if the input terminal 217 is at high level, the output terminal 218 is at low level;
is at a low level, the output terminal 218 is at a high level. Also, in Figure 11-c, the positive 0R gate has two input terminals 221 and 222, or three or more input terminals starting from 223, and if at least one of those input terminals is at a high level, the output is output. The terminal 224 becomes high level. Further, FIG. 11-d shows a preset counter 200, and the overall function of this circuit is that when a data signal from a preset dial is connected to an input terminal 226, a preset command signal is input from an input terminal 228, so that the tenter digits are is set in the internal counter. Also 227
is the clock input; when a pulse is input from this terminal, the output of the internal counter is the set data from terminal 226 minus the number of pulses. Terminal 23
1 is a terminal that outputs a high level output when the output of the internal counter becomes O, 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 set to O. Also, terminal 23
0 is an output terminal for displaying the counter output. The overall function of preset counter 202 is as described above as used in the circuit of the present invention. In order to satisfy this overall function, in addition to the above-mentioned counter circuit, an O detection circuit, an encoder for converting a decimal signal into a binary signal, etc. are included internally. Since there is no such thing, detailed explanation will be omitted. Next, the flip-flop circuit 233 in FIG. 11-e used in the embodiment of the present invention is a D-type edge-triggered flip-flop, but is not limited thereto. The function of this D-type edge-triggered flip-flop is to first connect the terminal 236 to
When a change from a low level to a noise level is applied externally, the current input terminal 235 is output from the output terminal 238.
High level or low level data is output and held. In addition, the input terminal 234 is a reset input terminal.
The output of the output terminal 238 is set to low level regardless of the input terminal of the CP. In addition, the input terminal 237 is conversely connected to the output terminal 2
Achieve 38 as 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. Further, the terminal 239 outputs a level opposite to that of the output terminal 238. Next, in the 1/2 frequency divider 240 of FIG. 11-f, when a change from low level to high level is applied to the CP input terminal 241, the Q output terminal 243 causes a change in level, and when it is at high level, When the level is low, it changes to 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 2411. First, an example of the circuit of the copy selection unit 105 will be explained with reference to FIG. 12.First, the types of copies in the present invention are classified into five types: single-sided half-size copy, single-sided full-size copy, double-sided A copy, double-sided B copy, and double-sided automatic AB copy. You can consider them separately.

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 feeding power set is half size, the input terminal 14
5 is a high level, and if it is a full-size cassette, the input terminal 147 is set to a high level, and if the signal from the copy selection dial is "single-sided", the input terminal 149 is set to a high level, and if it is still a double-sided A, the input terminal 149 is set to a high level. If 151 is still in double-sided B'', 153 is at high level, and if double-sided automatic is in effect, 155 is at high level, and the others are at low-no C level. First, AND gate 181 is
The output becomes high level when both the half-size cassette signal and the one-sided copy signal become high level, and is connected to the input terminal of AND gate 186.

Further, the output of the AND gate 182 becomes high level when both signals of the single-sided copy of the full-size cassette signal become high level, and is connected to the input terminal of the AND gate 187.
Furthermore, if the half-size cassette signal is at a high level and the A-side copy, B-side copy, or automatic copy is at a high level, the AND gates 183 and 18 are activated, respectively.
The output terminals of gates 4 and 185 are at high level, and are further connected to the input terminals of AND gates 188, 189, and 190, respectively. Therefore, when performing the above five types of Q copy,
AN when the dial and paper feed power set are set correctly.
Any one of D gates 181, 182, 183, 184, and 185 becomes high level. Therefore, when the outputs of these gates are individually connected to the input terminals of the 0R gate 197, the 0R gate output becomes a low level when there is no high level output. In other words, this indicates that the dial and force settings are not set to the correct state, so the output of the 0R gate 197 is transferred to the inverter 200.
When connected to the input of
It can be a. Next, the data of the number of copies set from the input terminal 161 is input to the next set counter.
By pressing the copy start button, a high level is input to the PRS terminal from 159, and thereby the Q terminal of the preset counter 202 becomes high level. Further, Q remains at a high level until the input pulse from the CP terminal reaches the same number of copies as the set number of copies or until a stop command is received from the terminal 157. The output from the preset counter 202 is applied to the input terminals of the AND gates 186, 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 186 becomes high level.
87. In the case of double-sided A, the AND gate 188, in the case of double-sided B, the AND gate 189, and in the case of double-sided automatic, the output terminals of the AND gate 190 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 gates 186, 187, 188, 189, 1
The outputs 90 can be used as single-sided half-size, single-sided full-size, double-sided A1, double-sided B, and double-sided automatic copy command signals, respectively. According to these copy instructions,
Although each unit performs a copy operation, 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 feed power set is half size, half size copy is made, and when the paper feed power set is full size,
The drum rotates, the optical system moves, and the paper feeds in each case to perform full-size copies in exactly the same way as a conventional copier. Briefly explain the timing relationship. In FIG. 10b, 2 is a photosensitive drum, 1 is a micro switch for detecting the rotational position of the drum, 403a, 404a, 403b, 4
04b is a cam attached to the drum, and each position is detected by pushing up the lever of micro switch 1. The drum rotates in the direction of arrow 405, and when a half-size copy command is generated, if the cam 403a on the drum is at position 1 at that time, copy rotation of the drum starts. Next cam 40
When 4a reaches position 401, the optical system is at position 135 and starts 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. During this time, when it reaches position 137, it outputs one clock pulse to the preset counter 1 mentioned above. The paper feeding process for the transfer paper is started mechanically when the optical system reaches the position 141 shown in FIG.
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 time the drum rotates to (position 403b), if there is still a copy command, 403a
The copy process is executed exactly the same as when starting from the position. However, in this case, the cam 404b corresponds to the cam 404a. Next, for full size, this 403
The cams b and 404b are irrelevant, and the copying operation always starts at the position 403a, and the optical system retraction start position is 403a, but other operations are the same as half-size copying.

Next, in the case of half-size copying, the rotational position of the drum is 40.
When the drum reaches position 3a or 403b, or in the case of full-size copying, if there are no more copy commands when it reaches position 403a, the drum immediately begins to rotate for transport. 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 403a reaches the position 401 for the second time, excluding the time when the conveyance rotation is started. 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, double-sided A
In the case of 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 moved to the reverse side copy preparation position. will be introduced in 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, for any type of copying, if the optical system has finished moving forward and the double-sided B copy command has already been output, the backward movement will stop at position 136, and the double-sided B copy command will be output.
Prepare for copy execution. Also, when the optical system is at position 135 and a double-sided B copy command comes, the drum will move to 403.
The copying rotation may be started after carrying out a half-rotation transport rotation from a to 403b or from 403b to 403a. In the meantime, the optical system can be advanced from position 135 to position 136 and placed on standby for double-sided B copying. Next, in the case of double-sided automatic copying, the A side copy command is first issued and the next command switching point is 1 while the optical system is moving forward.
After passing the position 37, that is, after the signal CCRP indicating the end of the image forming operation corresponding to A copy, a double-sided B copy command can be automatically issued.

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, the clock pulse input to the preset counter 202 and the pulse CCRP generated at the position Al37 in FIG. will be described later)
By connecting , it is possible to use the signals from J and others from its output terminal. Therefore, the next step is to perform double-sided automatic copying. To decompose into B copies, you can further do as follows. First, the output of this AND gate 195 is further connected to the CP terminal of the flip-flop circuit 203, and l is connected to the D terminal of 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 gate 19
Connect to the input terminal of No. 3 and its output. When there is a double-sided automatic copy command, the optical system moves forward while copying side A, and when it passes the position Al37 in Figure 10, the output terminal Q goes to a high level, and the output terminal Q becomes high level when the optical system moves forward while copying side A and passes the position Al37 in Figure 10. When the output of the AND gate 195 is generated, the signal returns to low level. Therefore, the outputs from the Q terminal and the 0 terminal, which outputs a signal opposite to the Q terminal, are connected to AND gates 191 and 191, respectively.
192 is connected to the single-power end, and a double-sided automatic copy command signal (output of AND gate 190) is connected to each other end, the outputs of 191 and 192 are double-sided B copy and double-sided A copy in double-sided automatic copying, respectively. It is possible to make it a command. That is, when a double-sided automatic copy command is generated, the 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 is activated.
67 becomes high level and the optical system moves forward while 203
Q becomes high level. Therefore, at that point, a double-sided B copy command is generated, and A-B side copying is automatically executed in an orderly manner. Therefore, AND gate 191,
The outputs of 192 are each connected to one input terminal of 0R gates 199 and 198, and the other input terminals are connected to AND terminals, respectively.
By connecting the outputs of gates 189 and 188,
The outputs of 0R gates 199 and 198 are both sides B, respectively.
It can be used as a double-sided A copy command signal. That is, the terminals 169, 171, 167, 1 in Fig. 12-a
When the commands 73 are at a high level, they become single-sided half-size copy, single-sided full-size copy, double-sided A, and double-sided B copy commands.

Next, an example of a circuit for controlling the rotation of the photosensitive drum is shown in Section 13-a.
To explain in the figure, first, as mentioned above, copying is performed when the drum position shown in FIG. , -403b
In this case, the drum home position is set to B, and the unit of drum rotation is the home position of the next drum from the drum home position.

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. be done. Therefore, there is already a drum home position signal coming to the other end of AND gate 234, or
When this occurs, the Q terminal of the circuit 233 becomes high level, indicating that a one-sided half copy execution latch has occurred. However, here, the flip-flop circuit 231 and the AND gate 2
30. If the previous copy is a double-sided A copy, the inverter 229 sets the transfer paper in the preparation position as described above, so until it is set, the drum home position is No signal is applied to the other terminals of the AND gate 234. 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 A
The output of the ND gate 230 becomes high level and is output from the output terminal 218 as the back surface preparation position set command signal as described above. The signal further enters the S terminal of the circuit 231, and its output maintains a low level between the output terminals until the paper detection C signal PDPC indicating completion of the preparation position setting is input from the terminal 217, as will be described in detail later. do.
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 home position signal for the next drum is generated after it is input. However, at this time, the home position signal of the drum is home position A.
, B are both input through the 0R 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 is irrelevant at this time, and single-sided full-size copying is performed. The size copy execution latch is generated, but the other process is exactly the same as the half copy execution latch, and the input terminal 169 is
AND gates 229, 234, circuit 233, output terminal 2
Each of 14 is 171, 232, 236, 235, 2
15, 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 AND gate 238 to set the ready position.
The process of generating the single-sided half copy execution latch is exactly the same, and the process of generating the duplex B copy execution latch is exactly the same as the process of generating the 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 output in accordance with each copy command. Next, these outputs 214 and 216 are connected to the input terminal of the 0R gate 221 as shown in FIG. 13-b. It is led to an output terminal 224 indicating the copy execution latch that should be in position, and is also connected to one input terminal of an 0R gate 222. Also 22
The output of 215 is connected to the other input terminal of 2, and the output of 222 is further connected to one input terminal of 0R gate 223. The output of 217 is connected to the other end of 0R gate 223, and the output of 0R 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 25.
8 and is applied to the input terminal of the AND gate 252 as a low level. Therefore, its output also becomes low level, and the conveyance rotation command output terminal 259 becomes low level.
Don't issue orders.

This output is further connected as a high level to an AND gate 256 and an R terminal of a 1/2 frequency divider (bistable multivibrator: hereinafter referred to as BM) 251 via an inverter 257. Further, 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 0R gate 255 from the terminal 210. Since the drum home position B signal (hereinafter referred to as DHPB) is applied from the terminal 211 to the other input terminals of the 255 via the AND gate 256, the output of the 0R gate 255 has a signal when the output terminal 259 is at a low level. is DHPA. When both DHPB signals appear and terminal 259 goes high, only DHPA appears and is applied to the CP terminal of terminal 250. Further, this signal is further passed through the inverter 253 to the BM. terminal 2
It is also applied to the 51 CP terminals at the same time. Further circuit 250
The output of the 0R gate 254 is connected to the D terminal of the gate 254, and the CPL signal is connected to one input terminal of the gate 254, and the output Q of the tun 251 is connected to the other end. Here, when the home position signal of the drum rises, the time it takes for it to reach the CP terminal of the terminal 250 is determined by the CPL mentioned above.
This is much faster than the time it takes to change through the various gates in the circuit shown. Therefore, depending on the rise of the drum home position signal, the output Q of the circuit 250 remains at high level or changes to high level, and when the same drum home position signal (hereinafter referred to as DHP) rises, the output Q of the circuit 250 remains at high level or changes to high level. Therefore, it is only when CPL changes to low level that terminal 2
59 becomes high level and issues a transport rotation command signal. This command is canceled by the AND gate 252 when CPL becomes high level at the next rising edge of DHP.
When CPL does not rise during conveyance rotation, it is released in the following sequence, that is, at this time, DHPB is AND gate 2
Due to 56, it is not applied to the CP terminal of 250, but it is 0R.
When the output of gate 255 first falls, BM. Since the reset signal of 25l goes low and the reset has already been canceled, the output Q goes high. Therefore,
Next, when a voltage rising to a high level appears at the CP terminal of the 0R gate 250, the output of the 0R gate 254 becomes a high level because of the output Q of the BM 25l, although CPL is already at a low level. Therefore, at this time, the output Q of the circuit 250
maintains a high level. But then 0R gate 255
When the output of BM25l changes to low level, the output Q of BM25l becomes low level and 0R gate 2 changes at the next rise of DHP.
Since the output of circuit 54 is already at a low level, the output of circuit 25
The output of 0 becomes a low level, and the transfer rotation command of the terminal 259 is canceled. Next, to explain the optical system movement command 113, 1 In FIG.
, 215 are the signals caused by the drum rotation previously described using FIG. A single-sided full-size copy execution latch (hereinafter referred to as FCPL) is input.

0TSA is directly connected to the input terminal of 0R gate 275, and 0
TSB is connected to 0R gate 275 via AND gate 274
FCPL is also connected to the other input terminal of the inverter 27.
3 to the other input terminal of AND gate 274.

Therefore, an optical system movement start pulse signal is generated from the output of the 0R gate 275. However, for single-sided full-size copying, only 0TSA is output, and for other copies, both 0TSA and 10TSB signals are output. Input terminals 267, 268, 269, and 270 each have a first input terminal.
The signal from the optical system position detection device shown in Figure 0b, i.e.
Optical system home positions A, B (hereinafter referred to as 0HPAs0HP
), optical system back position A, B (hereafter 0B)
(written as PA10BPB) is input. Also 226,1
Copy execution latch (CPL), duplex B copy command (BCCP), and half stop copy latch (HSCL) signals are input to input terminals 73 and 224, respectively. First, the input and output of the circuit 272 will be explained. When the output Q becomes high level, it is outputted to the output terminal 284 via the AND gate 280 as an optical system forward latch (0FL) 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 280 and the output terminal 284 becomes a low level and is not output. . Also, the output σ of the circuit 272 is the AND gate 281
The optical system retraction latch (0BL) is connected to the output terminal 285 via
) is output as a signal.

Also, the output Q is at high level and the 0FL signal is at the R terminal.
When the signal is ready to be outputted through the ND gate 280, the forward movement of the optical system is stopped and retraction is started. That is, in order to change the output Q from a high level to a low level, an optical system back position signal is input as a reset signal. However, this optical system back position signal is 0.
BPB is input as is through 0R gate 283, but 0BPA is input through AND gate 282 and the HSCL signal connected to its other output terminal. It is input via the OR gate 283 only in the case of single-sided half-size copy and double-sided A copy. If CPL is now at a high level and is applied from terminal 226 to the D terminal of circuit 272, the optical system is at home position A and terminal 269 is applied.
becomes high level or when executing double-sided B copy, the AND gate 276 is at home position B.
When the output of the AND gate 276 becomes high level, each signal is connected to the input terminal of the 0R gate 277, so its output becomes high level. Further, since it is connected to the input terminal of the AND gate 278, the output of the 0R gate 275, that is, the optical system start pulse, is inputted from the output of the AND gate 278 to the CP terminal of the circuit 272 as a clock pulse. Therefore, the output Q becomes high level and the AND gate 28
0 from the terminal 284 as a 0FL signal. Now, if the optical system is at home position A and the double-sided B copy command signal is input, the optical system is
Proceed as described above. Reach home position B and 0
When the HPB signal is generated, the AND gate 276 becomes high level. This is applied to the CP terminal of the circuit 271, and at this time, a high level is applied to the D terminal as the BCCP signal, so the output O becomes a low level.
Since this is connected to the other input terminal of AND gate 280, its output goes low and the forward command from terminal 284 is 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. Start. Next, as described above, when the optical system generates an optical system back position signal corresponding to the type of copy being executed from the output of the 0R gate 283 and applies it to the R terminal of the circuit 272, the output Q becomes a low level. Advance command is canceled. However, since the output Q becomes high level and is outputted as a 0BL output via the AND gate 281, backward movement starts. However, the output of the 0R gate is inverter 279
Since the BCCP signal is applied to the other input terminal of the AND gate 281 via the
When B 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 0HPA becomes high level, the output of 0R gate 277 is becomes high level, and a low level signal is sent from the inverter 279 to the AND gate 281.
was added to cancel the retreat order. Next, FIG. 16 shows the process of generating the output of the drum drive latch (hereinafter referred to as DDL) at the terminal 286 that commands the rotation of the drum, but as is clear from the previous explanation, this occurs when CPL is high. It starts to rotate when the transfer rotation command (hereinafter referred to as FIL) is at high level.

That is, FIL. from terminals 259 and 226, respectively. C.P.L.
is input and connected to the 0R gate 283, and its output becomes DDL. Next, referring to FIG. 17, the process of generating the transfer paper feed command signal 117 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 the completion of setting the back side copy preparation position (indicates the end of the image forming operation corresponding to A copy), and also indicates that the transfer paper is present at the preparation position. It also shows that. Details regarding this PDPC will be described later. This signal is AN
It is connected to the single power end of D gate 308 and the input terminal of inverter 307 . Also, from the terminals 301 and 302, the first
14 respectively by moving the optical system as shown in Figure 0b.
A pulse signal generated at the 1,14V position is input. These are arranged to provide paper feeding timing pulses for single-sided copying, double-sided A copying, and double-sided B copying, respectively. Further, each signal is connected to one input terminal of AND gates 303 and 305. Further, a double-sided B copy execution latch signal BCPL is inputted from the terminal 217 and connected to the other input terminal of the AND gate 303 via the AND gate 305 and the inverter 304. An optical system advance latch signal is also input from the terminal 284 and connected to one input terminal of the AND gate 310. Therefore, during double-sided B copying, the PFSB is input to the 0R gate 306 via the AND gate 305.
When a signal is input, or during other copying, the PFS
A is input via AND gate 303. Furthermore, the paper feed start signal outputted via this 0R gate 306 is connected to one input terminal of an AND gate 310.
Further, since the 0FL signal is input to the other input terminal of the AND gate 310, the output terminal of the AND gate 310 outputs PFSA or PFSB generated when the optical system moves forward, and the paper feed timing pulse (PFSB) is output from the terminal 342.
SP) and is output to other circuits as AND gate 3.
08 and one input terminal of the AND gate 309. That is, paper feeding for the second copying process is performed using the B copy execution latch signal BCPL and the paper detection signal PDPC.

As described in the explanation of FIGS. 12 and 13, the latch signal BCPL is connected to the signal AB and the signal C when the A copy of the AB copy is completed.
It is formed by the signal BCCP which is switched out under CRP. Therefore, at this time, if the paper is set in the back paper feed preparation position, the output from the AND gate 308 will be at the terminal 3.
If no paper is set in the preparation position, a signal is output from the output of the AND gate 309 to the terminal 341 as a force set paper feed command. Next, the process of generating the preparation position set command signal will be explained. First, in FIG. 1, in order to effectively implement the present invention, when a preparation position set command signal is generated (in this example, the first
(Output of terminal 218 in Figure 31a) The transfer paper can be set in the preparation position by the following process.

First, when the transfer paper passes through the fixing device 20 and moves toward the tray 30 by the paper ejection roller 22, the paper detection device A2
After the passage of the transfer paper is confirmed by step 4, the rotation of the paper discharge roller 22 is stopped while the transfer paper is held in the paper discharge roller 22, and the guide plate 26 is moved, and the lateral deviation correction control is performed. After completion, the rollers 22 and 27 convey 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 Cl34. As a result, this high-speed preparation position setting rotation is stopped, and in response to the preparation position sheet 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-mentioned method. For example, a paper detection device Bl33 may be provided between the conveyance rollers 28 and 29,
Another possible method is to transport the paper to that position by high-speed preparation position set rotation, then stop the rotation, and then feed the paper in response to the next preparation position paper feeding command. However, at this time, the timing at which the paper reaches the transfer position must be the same whether the paper is fed from the preparation position or the paper is fed from the force set. In this embodiment, when the leading edge of the paper reaches the position of the paper detection device Cl34 located between the rollers 27 and 28, the rotation of the high-speed preparation position is stopped, and the normal transport time for the transfer paper from that position to the roller 28 is The circuit shown in FIG. 18 will be explained by taking as an example the case where the time for the paper feed command signal to be generated, the paper to be fed from the force set, and the time for the transfer paper to arrive at the roller 28 is made equal.

First, a double-sided A copy execution latch signal is input from the input terminal 216 to the D terminal of the circuit 346, and a preparatory 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 remains at a high level while holding the signal PPSC.

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 high level. This output indicates that the transfer paper to be subjected to double-sided A copy and set in the preparation position is passing through the paper detection device A section. This output is first input to the R terminal of circuit 346, resets its output Q, and is also connected to the negative 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. . At this time, the output rises and is input to the CP terminal of the 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 high level.
It is output from the terminal 355 as a preparation execution command (HPFC). At this time, the circuit 351 receives the output of the circuit 353 at its R terminal and is set. Next, when the transfer paper reaches the position of the paper detection device C, PDPC becomes high level and is input to the R terminal of the circuit 353, resetting the output Q and H
PFC is canceled. As described above, the present invention feeds a copy material from the storage section (Fig. 1: 16), forms a copy image on the first side of the copy material, and moves the copy material to the preparation position for copying on the second side without ejecting the copy material. The first copying process means (Fig. 1: 22, 4
~6), a second copying process means (for feeding the copy material from the preparation position, forming a copy image on the second surface of the copy material, and discharging the copy material;
Fig. 1: In a double-sided copying apparatus having 28, 29, 1), a first copy mode (A copy) in which the copy material is put on standby without being ejected after copying of the copy material to the first side is completed; Copy mode selection means (37 in Figs. 4 and 5) for selecting one of the second copy modes (AB copy) in which the second side copy is automatically completed and the copy material is ejected after the copy is completed.
and command means (Figs. 4 and 5: 34,
35), means for detecting the conveyance of the copy material to the preparation position (Fig. 1: 34), and when the first copy mode (A copy) is selected by the copy mode selection means 37, the first
In order to complete copying onto the surface and wait the copy material at the preparation position, a first copy mode signal (
The first copying process means is operated according to the copying start command signal (FIG. 12: CCP) from the commanding means and the second copying process means is operated after copying to the first side is completed. When the operation is blocked and the second copy mode (AB copy) is selected by the copy mode selection means 37, the copy mode is changed in order to complete copying to the first side and then continue copying to the second side. a second copy mode signal from the selection means (
AB) and a copy start signal (CCP) from the command means to operate the first copy process means, and after the copying to the first side is completed, a latch signal (AB) generated by the second copy mode signal (AB) is activated. Figures 13 and 17: BCPL) and conveyance detection signals by the detection means 134 (Figures 13 and 17:
PDPC) and control means (FIGS. 9 to 18) for causing the second copy process means to be executed without inputting a copy start command signal (CCP) by the command means. .

As a result, the copying material that has been completely copied onto the first side is checked before copying onto the second side, so that copying onto the first side and the second side can be accurately accomplished without interrupting the copying operation. Furthermore, it is extremely convenient because it is possible to arbitrarily select between discontinuing copying on the first side after completion of copying and copying without interruption on the first and second sides. 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.

First, when the power is turned on, all outputs of each flip-flop are reset, and when generating detection signals in each position detection device, a contact type switching element such as a micro switch is used. However, the explanation of the fact that these all use a chattering prevention circuit is omitted, and furthermore, the driver circuit of each device that is driven according to each command is also omitted. Furthermore, the control circuit according to the present invention is by no means limited to the circuit described here.

[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 device, Figure 5 is a front view of the operation panel of the device, Figures 6A, b, and c are illustrations of placing the original on the document table, and Figure 7 is the mechanism for back-side copying. Partial perspective view, Fig. 8A, b,
c. Illustration for explaining the placement of documents such as old bowls in case of right binding and left binding,
Figure 9 is a block diagram of the electrical control system of this embodiment, Figures 10A and b are explanatory diagrams of the position of the optical system and paper feed control, and Figures 11A, b, c, d, e, and f are the main An example of the digital logic circuit used in the embodiment, FIG. 12 is a circuit diagram of the copy selection section,
Figures 3A and 3b are circuit diagrams for controlling the rotation of the photosensitive drum, Figure 14 is a circuit diagram for conveyance rotation command (execution rat), Figure 15 is a circuit diagram for controlling the movement of the optical system, and Figure 16 is a circuit diagram for controlling the rotation of the photosensitive drum. FIG. 17 is a circuit diagram for controlling the rotational drive, FIG. 17 is a circuit diagram for controlling the paper feeding of the transfer material, and FIG. 18 is a circuit diagram for controlling the paper feeding preparation.

Claims (1)

[Claims] 1. A first copying process means for feeding a copying material from a storage section, forming a copying image on the first side of the copying material, and conveying it to a preparation position for copying the second side without ejecting the copying material, copying from the preparation position. A double-sided copying apparatus having a second copying process means for feeding a copy material, forming a copy image on the second side of the copy material, and discharging the copy material, wherein the copy material is not discharged after copying to the first side of the copy material is completed. a copying mode selection means for selecting either a first copying mode in which the copying material is placed on standby, or a second copying mode in which copying on the second side is automatically completed and the copying material is discharged after copying on the first side is completed; a command means for commanding the start of copying; a means for detecting conveyance of the copy material to the preparation position; and when a first copy mode is selected by the copy mode selection means, copying to the first side is completed and the copy material is In order to wait in the preparation position, the first copying process means is operated by a first copying mode signal from the copying mode selection means and a copying start command signal from the commanding means, and copying to the first side is completed. After blocking the operation of the second copying process means and selecting the second copying mode by the copying mode selection means, in order to complete the copying on the first side and then continue the copying operation on the second side, The first copying process means is operated by the second copying mode signal from the copying mode selection means and the copying start signal from the commanding means, and after the copying on the first side is completed, the second copying mode signal is activated. a double-sided copying apparatus, comprising: a control means for executing the second copying process means without inputting a copy start command signal from the command means, based on a latch signal and a conveyance detection signal from the detection means.