JPS6322307B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine, particularly to a device for correcting positional deviation of copy material being conveyed in a double-sided copying machine or the like.

In conventional copying, it was common to copy onto one side of a single sheet of copy paper. However, when storing a large amount of copies, the amount is twice that of a book or the like that is copied on a single screen, which poses a problem in terms of storage space and weight. Further, from the viewpoint of resource saving, labor saving, copying cost, etc., there is a need for a double-sided copying machine that copies on both sides of a sheet of copy paper.

As a copying device capable of double-sided copying using the transfer method,
Several formats have been considered, one of which is to perform normal copying (transfer/fixing) on one side of transfer paper, and then return the copied paper to the original or second paper feeding device. The paper is then turned over and fed into the copying machine again, and the back side is copied in the same way as the front side. This method can be said to be the most practical method because the copying process requires only one set of copies, which is the same as for single-sided copying, and the copying machine can be made inexpensive and compact.

However, in a copying device that guides the transferred paper after copying to the second paper feeding device and sends it back to the copying device to make the second copy as described above, the difference between the first copy and the second copy is If the copy paper is deviated from the normal position (reference), the positions of the first and second copy images formed on the copy paper will also be deviated, which is undesirable.

On the other hand, as shown in Japanese Patent Application Laid-Open No. 49-107239, it has been known that
A known configuration is known in which the original is shifted in the width direction before the second circulation to correct the positional deviation.

However, since the purpose of the conventional example described above is to correct the lateral deviation of the original, the positional deviation correction device is simply provided within the original circulation path. Therefore, when the document is shifted in the width direction, the trailing edge of the document is held between other rollers, etc., and the document may be easily damaged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional example, and an object of the present invention is to provide a preferable positional deviation correcting device for correcting lateral deviation of copy paper of a copying machine.

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 original 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, lens 7
The light is slit exposed through fixed reflection mirrors 8 and 9, and is imaged onto the drum 1.

The surface of the drum 1 consists of a photoreceptor whose photoreceptor layer is covered with a transparent insulating layer.
1, it is positively charged. Next, the exposure section 12
When the original 3 on the transparent plate 2 of the original table is illuminated by the illumination lamp 6, an image is formed on the drum 1 by the movable reflecting mirrors 4, 5 and the fixed reflecting mirrors 8, 9 of the lens 7. At the same time as the photoreceptor is exposed to the original image, it receives an AC discharge from an AC discharger 13 to which AC high voltage current is supplied from a high voltage power supply 10.

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 1 sent from the cassette 16
7 is brought into close contact with the drum 1. The transfer charger 18 positively charges the transfer 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, the copy paper that passes through the fixing device 20 during front side copying, is conveyed by the ejection roller 22, and advances while having excess charge removed by the static eliminator 23.
The passage of the rear end is detected by the light receiving element 24, and the ejection roller 22 is reversed, leading to the path 2 for back side copying.
5. The guide plate 26 is moved to a position where it guides the copy paper into the path 25 at the same time as the paper discharge roller 22 is reversed, and the copy paper is stopped near the register roller 29 by conveyance rollers 27 and 28.

Next, the process moves to backside copying, and the copy paper is sent to the transfer device by the paper feed signal while being controlled by the register roller 29 again. After the transfer is completed, it is transferred to the tray by the paper discharge roller 22 via the fixing device 20 and the static eliminator 23. 3
Ejected to 0.

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, A side and B side (each A4
Two A4-sized pages 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 with ordinary copying paper, the illumination section of the optical system and 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 mirrors and illumination parts 4 and 6 of the optical system are activated by the start signal 4a and 6.
Stop at position a.

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

Next, the case of B-side copying will be explained with reference to FIG. When the exposure process for the surface is completed, the optical system stops at positions 4c, 5c, and 6c.

The length of the exposure stroke for side A (same for side B) is the length l of side A plus the slit width and allowance for starting and stopping the movement. Therefore, the optical system is the second
The stop positions 4a, 5a, and 6a shown in the figure are reached. 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 proceeding 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, the following convenient features can be added by determining these sides A and B to be the original platen mounting surface for front-side copying, and the B-side to be the original platen mounting surface for back-side copying.

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 side B, First, it is displayed that it is a reverse 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, books are bound on the right, as shown in Figure 9.
There are two types of left binding, but in both cases, the front side of each sheet of paper is usually an odd numbered page, and the back side is an even numbered page. 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 book is as shown in Figure 9.
By binding on the left (a, b) and binding on the right (c, d), the book will be placed upside down. This is also one of the advantages that by determining sides A and B to be front copy and back copy, respectively, 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 other 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 static eliminator 23. The passing of the rear end of the copying machine is detected by the light receiving element 24. , by reversing the discharge roller 22, the passage 25 for backside copying is opened.
A more detailed explanation will be given of the mechanical operation when the robot is guided in FIGS. 7 and 8. First, fuser 2
No. 0 employs a fixing method using a so-called heat roller, and its structure includes a heater 45 at the core and a freely rotating heat roller 41, and the surface is covered with silicone rubber. The heating roller 42 is a fixing roller that 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, fixed thereon, and guided to a discharge roller 22. At this time, the fixed copy paper is transferred to the fixing roller 4.
2, and a scraper 46 and a separation claw 47 are provided to prevent the heating roller 41 from being wrapped.

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
As a result, the rotation of the sprocket 51, which is free from the discharge roller shaft 57 in the direction of the arrow, is transmitted to the discharge roller shaft 57 via the electromagnetic clutch 53.

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 off.
is turned on, and the rotation of the sprocket 52, which rotates in the direction of the arrow by the chain 50, causes the electromagnetic clutch 5 to rotate.
4 to the gear 56, and then to the gear 55 fixed to the discharge roller shaft 57, the discharge roller 22 rotates in the direction B.

Now, the copy paper that has passed through the fixing device is ejected to the ejection roller 2.
2 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 electrically detected by the paper trailing edge detection mechanism, the electromagnetic clutch 53, which had been on until now, is turned off by the electrical signal, and the movement of the paper is stopped. By the way, it cannot be said that the transfer paper that has reached the ejection roller section will not be subject to lateral deviation in the direction of movement, so it is necessary to check whether or not there is lateral deviation and to correct the lateral deviation before entering the reverse side copying process. is necessary. To this end, we propose a lateral shift correction mechanism as shown in FIGS. 7 and 8.

First, as described above, the electromagnetic clutch 53 is turned off and the movement of the paper is stopped for a moment. In FIG. 8, in order to correct the deviation in the lateral direction with respect to the traveling direction of the paper using the CdS 70 and the lamp 71, first until the side edge A of the paper comes on the optical axis connecting the lamp 71 and the CdS 70 as shown in the figure. The paper must be moved in the direction of arrow B. Conversely, if the side edge of the paper is at arrow A' as shown by the dotted line, move the paper in the direction of arrow B' and place the edge on the optical axis connecting CdS 70 and lamp 71. By stopping the movement when the copy arrives, the horizontal deviation of the paper can be corrected.

Next, referring to FIG. 8, the mechanism for correcting the lateral deviation of paper will be described.

22 is a discharge roller, and 48 is a discharge driven roller that follows the discharge roller. The driven roller 48 is fixed to a driven roller mounting shaft 72 with a screw, and this mounting shaft 72 is rotatably held by a bearing 73. The bearing 73 is fixed to a discharge roller mounting board 74, and the shaft 72 is positioned by a tension washer 75 so as not to move in the thrust direction. On the other hand, the discharge roller 22 is fixed to a discharge roller shaft 57 with a screw, and the shaft 57 is rotatably fixed to a bearing 76. Also, the shaft 57 is attached to the mounting board 74 in the thrust direction.
and is positioned by a tension washer 77. Further, a pin 77 is driven into the shaft, and the shaft 57 is engaged with an elongated hole C formed in a part of a collar 78 that freely moves in the thrust direction. It is firmly fixed to the shaft 79 with screws or the like. Further, the shaft 79 is fixed to the gear 55 (FIG. 7). The other end of the shaft 57 is attached to a slide bearing 81 attached to a main body side plate 80 so as to be freely movable in the thrust direction. The mounting board 74 is connected and fixed at the lower part to a part 82a of the slide rail, and this slide rail 82a is connected to the other slide rail 82.
b and is slidably connected by a steel ball 83. The slide rail 82b is fixed to a mounting plate 84, and the mounting plate 84 is fixed to the main body side plates 80 and 85.

On the other hand, a shaft 86 is fixed to the mounting board 74 by caulking or the like, and on the other hand, this shaft 86 is held by a slide bearing 88 attached to a main body side plate 85 so as to be freely slidable in the sliding direction. The other end of this shaft 86 is threaded. On the other hand, a collar 89 having a female threaded portion that engages with the threaded portion of the shaft 86 is fixed at one end to the shaft of the reversible motor 90 . The reversible motor 90 is fixed to a motor mounting plate 91.
is fixed to a substrate 92 attached to the side plate 85 of the main body. Here, when the collar 89 rotates in the direction of arrow D, the shaft 86 moves in the direction of arrow E.

Further, the lamp 71, the CdS 70, and a slit 93 for narrowing the optical axis in order to accurately stop the side edge of the paper at a specified position are fixed to the main body side plate 85 with a mounting plate or the like.

On the other hand, regarding the CdS 24 and the lamp 49, there is still a slit 94 to narrow down the optical axis.
The lamp 49 and the CdS 24 are fixed to the main body side plate 80 with a mounting plate or the like, and the slit 94 is fixed to the mounting board 74.

Next, the operation of this correction mechanism will be explained.
When the paper stops advancing with the side edge of the paper at position A in FIG. 8, the optical axis of the lamp 71 and CdS 70 is Until the side edge of the paper crosses the optical axis, the reversible motor 90 operates so that its collar 89 rotates in the D direction, moves the shaft 86 in the direction of arrow E, and the side edge of the paper crosses the optical axis. Momentary motors instantly stop their operation.

On the other hand, if the paper stops at the position indicated by the dotted line in FIG. Due to the mechanism, the color 8
9 rotates in the opposite direction to the rotation direction D, the shaft 86 moves in the opposite direction to the arrow E, and the moment the side edge of the paper crosses the optical axis, the motor instantly stops its operation.

As described above, when the side edge of the paper reaches its normal position, the electromagnetic clutch 54, which had been off until now, turns on, and the ejection roller that grips the rear edge of the copy paper rotates in the opposite direction. 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) also moves as shown in FIG. The state is maintained as shown by the solid line shown. The guide plate 26 is displaced around the shaft 62 to the position shown by the dotted line in FIG. 1 by the operation of the solenoid 58.
The copy paper is guided into a path 25 for backside copying and stopped near a register roller 29 by conveying rollers 27 and 28.

After the paper has come out of the ejection roller section, the reversible motor, for example, first moves to the paper side until the light from the lamp 49 hits the CdS 24, in other words, until the slit 94 returns to its normal position (the position shown in Figure 8). In order to detect the end, the mounting board 74 moves in a direction opposite to the direction in which it is moved (direction E) and stops the moment the light from the lamp 49 is detected by the CdS 24.

As mentioned above, correcting the horizontal misalignment of the paper is to correct the original image on the copy paper.
This will help prevent lateral slippage.

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.

Reference numeral 31 is a copy number setting dial which allows setting of 1 to 99 copies by aligning the scale of the dial with the index, and 32 is a number display tube that shows the number of copies that have been made. Reference numeral 34 is a copy start button for copying multiple copies, and if you wish to copy only one copy, press another copy start button 35 to copy only one copy regardless of the instruction on the number of copies set dial 31. . 36 is a shade selection dial that determines whether the image is dark or light; 37
is a copy type selection dial for side A, side B, single-sided, and double-sided (AB). Here, "for side A" means that when this dial 37 is set to A, the display 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 As shown in FIG. 6, after the trailing edge of the copy paper is detected by the light receiving element 24, the solenoid 58 and the electromagnetic clutch 5
3 and 54, and stops at the preparation position for copying side B. However, when making multiple copies,
The copy sheets on which copying has been completed except for the last one are discharged as they are to the paper discharge tray 30.

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, whether copying multiple copies or one copy, the copy paper is ejected. It is discharged onto the tray 30. 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 paper ejection tray 30 as is.

Next, when the dial 37 is set for AB, the copying process for side B is automatically started after copying side A, and after copying side B, the paper is automatically discharged to the paper output 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 manuscript table, such as when copying several consecutive pages of a book, and each opened page is placed on its own manuscript placement surface, first turn the selection dial 37. Copy the original on side B onto the back side of the first sheet of copy paper and eject it, then set the selection dial 37 to side A and copy the original on side A on the front side of the second copy sheet. Copy.

Turn over one page of the book, use dial 37 for side B, copy on the back of the second copy paper, then use dial 37 for side A, copy on the front of the third copy paper, and turn the book again. Then use the dial 37 for side B to copy onto the back of the third sheet of copy paper, then set the dial 37 for side A to copy onto the front of the fourth sheet of copy paper, and so on. The placed two-sided originals are not copied onto both sides of the same copy paper, but are copied onto one side of the first copy paper and the other side of the second copy 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 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, as mentioned above, to save operational effort. It is.

Also, to determine whether sides A and B are being copied to either page of the book on the manuscript table, the specimen lamp should be near side A.
Since they are lit near the B side as 39 for the A side and 38 for the B side, they can be easily distinguished.

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 number of copies you need using the number set dial 3.
1, then turn the selection dial 37 to AB.
When the user presses the copy start button 34 for convenience, the required number of double-sided copies can be automatically made. At this time,
Since both display 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 according to the present invention will be explained using the above embodiments. FIG. 10 is a block diagram in which devices related to control are divided by function. first,
101 is a home position set of the drum when turning on the power of the morgue, such as a power input section, a door switch, a shut-off in case of a jam, etc.;
It also includes various reset devices such as those for resetting the control circuit, which will be explained later, and a warm-up setting device if necessary. Next, reference numeral 103 is a device for checking the filling and replenishment of cassettes, transfer paper, developer, and other consumables, similar to the conventional device. 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) of 107, which generates operation command signals to various operation parts for copying.
7 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, 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 cassette to a transfer position. As described above, the CPU 107 issues operation command signals to each operation execution section. Reference numeral 121 includes operation execution sections that do not require feedback to the CPU 107, such as a document irradiation lamp, a high-voltage power supply operation section, 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
Feedback is provided to the CPU 107. 12 more
5 is an optical system movement unit which similarly includes a position detection device and receives feedback from the CPU 107. Reference numeral 127 denotes a transfer paper detection device, which is provided at a necessary location in the transfer paper circuit and generates a paper detection signal.
7 is input.

Next, reference numeral 131 is a roller detection device, which is used to confirm the normal conveyance of the transfer paper, and is the same as 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 Figure 1, 135, 136, 13
Reference numerals 7, 138, and 139 indicate 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 start 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 a single-sided half-size copy, the optical system 4 advances 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 138.
Move forward from position 35 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, this example is shown in half size.
Assuming that the full size A4 size is the A3 size, the positional relationship of each position detection device may be as follows in order to effectively implement the present invention. That is, in FIGS. 11 and 12, the portion corresponding to l ₁ and the portion corresponding to l ₂ are made to match the width of the A4 size sheet. Therefore, l ₃ , which is the sum of l ₁ and l ₂ , corresponds to the vertical width of the A3 version.
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 l ₁ , l ₂ , l ₃ in each case. It is best to move with a little extra length. That is, starting position 1
35 or 136 are l ₁ (or l ₃ ) and l ₂ respectively
A distance margin of α ₁ and α ₃ is provided from the left end of , and the back position 138 or 139 is
It is better to have a distance margin of α ₂ and α ₄ from the right end of l ₁ and l ₂ (or l ₃ ). Therefore, in this case, the start position 136 and the back position 138 are respectively the center position and
It is located at a distance of α ₃ and α ₂ from 140 to the left and right.

Next, the signal generating device for counting the number of copies is used as an optical system position detecting device, as shown in FIGS. 11 and 12.
37 may be provided. Conventionally, this type of signal is
A paper feed command signal, which will be described later, may be used, a paper detection signal in the transfer paper path, or a signal from another optical system position detection means or a drum rotational position detection device may be used. In this embodiment, an optical system position detecting means located between 136 and 138 is provided to detect this signal, and the signal therefrom 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. This is done only once and is convenient for subsequent operations.

Further, in FIG. 1, reference numerals 24, 133, and 134 indicate paper passage detection means, which may be constructed of a lamp-photosensitive element bear or an ultrasonic transmitter/receiver bear. 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, Figure 13 a2
10 is a positive AND gate, input terminal 21
1,212 has two terminals, or 213 and later have three or more terminals.For those with two input terminals, both of them or three or more terminals become high level, and when all the terminals become high level, the output terminal 214 becomes high level and one However, if there is a low level signal, output terminal 2
14 is a low level. Next, Figure 13 b216
is 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. FIG. 13c shows a positive tape OR gate with two or two input terminals 221 and 222.
The output terminal 224 has three or more input terminals after 23, and if at least one of these input terminals is at a high level, the output terminal 224 becomes a high level. Also the first
3 d200 is a preset counter, and the overall function of this circuit is that when the data signal from the preset dial is connected to input terminal 226,
By inputting a preset command signal from 8, tenter numbers are set in the internal counter. Also, 227 is a clock input, and when a pulse is input from this terminal, the output of the internal counter is output from the terminal 226.
The number of pulses is subtracted from the set data from . Terminal 231 is a terminal that outputs a high level output when the output of the internal counter reaches 0, and 229 is a reset input terminal, and when a positive pulse is input from this terminal, both the set input and output of the internal counter are reset to 0. be done. Further, the terminal 230 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, a 0 detection circuit and an encoder for converting a decimal signal into a binary signal are included internally, but these are not directly related to the present invention. Since there is no such thing, detailed explanation will be omitted. Next, the flip-flop circuit 233 in FIG. 13e used in the embodiment of the present invention is D.
The type is an edge trigger top flip-flop, but is not limited thereto. The function of this D-type edge-triggered flip-flop is that when a change from a low level to a high level is externally applied to the terminal 236, the output terminal 238
From there, the data of whether the input terminal 235 is at the high level or low level at that time is output and held. Further, the input terminal 234 is a reset input terminal and sets the output of the output terminal 238 to a low level regardless of the input terminal of the D.CP. Moreover, the input terminal 237 makes the output terminal 238 a high level. Here, most of the RS input terminals generally perform their functions at low level, but in order to simplify the explanation, the following explanation will be based on the assumption that the terminals perform their functions when the level is high. Further, the terminal 239 outputs a level opposite to that of the output terminal 238.

Next, in the f1/2 frequency divider 240 in FIG. 13, when a change is applied to the CP input terminal 241 from low level to high level, the Q output terminal 243 causes a level change, and when it is at high level, it becomes low level. In addition, when the level is low, it changes to high level. Also, the B input terminal is the Q output terminal 243
When a high level is applied to the R terminal, 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. 4, first, the copy types in the present invention may be divided 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. 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 a half-size paper cassette, the input terminal 145 is set to a high level, and if it is a full-size paper cassette, the input terminal 147 is set to a high level, and the signal from the copy selection dial is input if it is "one-sided". Terminal 149 is at high level, and 151 is at high level for "Double-sided A", 153 is at "Double-sided B", and 155 is at high level for "Double-sided automatic", and the others are at low level. Then, first, the output of the AND gate 181 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 the AND gate 186. Furthermore, the output of the AND gate 182 becomes high level when both the full-size cassette signal single-sided copy signals become high level, and the output of the AND gate 187 becomes high level.
connected to the input terminal of Furthermore, the half-size cassette signal is at high level, and the A-side copy is
Or, if side B copy or automatic copy is at a high level, AND gates 183, 184,
The output terminal of 185 becomes high level, and is further connected to the input terminals of AND gates 188, 189, and 190, respectively. Therefore, when performing the five types of copying described above, if the dial and paper cassette are correctly set, the AND gates 181, 182, 1 are activated.
Any one of 83, 184, and 185 becomes high level. Therefore, when the outputs of these gates are individually connected to the input terminals of the OR gate 197, the OR gate output becomes a low level when there is no high level output. In other words, this indicates that the dial and cassette are not set in the correct state, so when the output of OR gate 197 is connected to the input of inverter 200, this output becomes high level and this is displayed as the cassette and dial inspection display. It can be the lamp lighting signal 129-a.

Next, the data of the number of copies to be set from the input terminal 161 is input to the preset counter to the PD terminal, and by pressing the copy start button, a high level is input to the PRS terminal from 159, thereby causing the preset counter to The Q terminal of 202 becomes high level. Further, Q remains at a high level until the input pulse from the CP terminal becomes the same as the set number of copies or until a stop command is received from the terminal 157. The output from this preset counter 202 is connected to the AND gate 186,
It is added to other input terminals 187, 188, 189, and 190. Therefore, at this time, the output terminal of the AND gate 186 becomes high level in the case of a single-sided half-size copy, and the output terminal of the AND gate 186 becomes high level in the case of a single-sided full-size copy.
The output terminals of AND gate 187, 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. is added and its output Q becomes low level, it returns to low level. Therefore, AND gates 186, 187, 188, 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 instructions, and an effective embodiment of the present invention may specifically be as follows. In other words, although this overlaps with the above, when the copy selection dial is set to "single-sided" and the paper cassette is half size, a half-size copy is made, and when the paper cassette is full-size, a full-size copy is made, and a conventional copy is made. Execute exactly the same as the machine. The relationship between drum rotation, optical system movement, paper feeding, and timing in each case will be briefly explained. In FIG. 12, 2 is a photosensitive drum, 401 is a micro switch for detecting the rotational position of the drum, 403a, 404a, 403
b, 404b is a cam attached to the drum, 401
Each position is detected by pushing up the lever of the micro switch. The drum rotates in the direction of arrow 5, and when a half-size copy command is generated, if the cam 403a on the drum is at the position 401 at that time, copy rotation of the drum starts. Next, cam 404
When a reaches the position 401, the optical system moves to 135
Start moving forward at the position. During this forward movement, the original is exposed to light, and when it reaches position 138,
(Exposure process) is completed and the optical system begins to retreat.
During this time, when it reaches position 137, it outputs one clock pulse to the aforementioned preset counter. Further, the paper feeding process of the transfer paper is started mechanically when the optical system reaches the position 141 while moving forward.
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, when the rotation of the drum reaches (position 403b), if there is still a copy command, the copying process is executed in exactly the same way as when starting from position 403a.

However, in this case, cam 404a corresponds to cam 404a.
It becomes 04b. Next, in the case of full size, this 40
The cams 3b and 404b are irrelevant and are always 40
The copy operation is started at position 3a, and the optical system retraction start position is 403a, but other operations are the same as half-size copy. Next, in the case of half-size copying, when the rotational position of the drum reaches position 403a or 403b, and in the case of full-size copying, if there are no more copy commands when it reaches position 403a, the drum immediately It becomes conveyance rotation. 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, in the case of double-sided A copy, the copy operation is exactly the same as single-sided half-size copy, but if there is no subsequent double-sided copy command, the transferred transfer paper is not ejected and the reverse side copy is prepared in the double-sided A copy execution process. introduced into 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 single-sided half-size copying is that the movement of the optical system is as shown in Figure 12.
The exposure of the original is performed in the range of 136 to 139. 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, the optical system is 135
When the double-sided B copy command is received at the position , the drum performs a half-rotation transport rotation from 403a to 403b or from 403b to 403a, and then
It may also be possible to enter copy rotation. In the meantime, advance the optical system from position 135 to 136,
It can be placed on standby for double-sided copying. Next, in the case of double-sided automatic copying, the A-side copy command is first issued, and after the next command switching point, that is, the position 137 in which the optical system is moving forward, is passed, the 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. 14 again. First, as for the clock pulse input to the preset counter 202, the pulse generated at the position 137 in FIG. (described later), it is possible to use the signal from the output terminal. Therefore, in order to further divide the double-sided automatic copy into double-sided, A, and B copies, the following can be done. First of all, this
The output of the AND gate 195 is further connected to the CP terminal of the flip-flop circuit 203, and its D terminal is
The A-side copy execution latch (the process of occurrence will be described later, but this means that the A-side copy is in progress) and the double-sided automatic copy command are connected to AND gate 1.
93 input terminal and its output.
Output terminal Q is used when there is a double-sided automatic copy command.
The optical system moves forward while copying the A side, and as shown in FIG.
When it passes the position 37, it becomes high level, and the AND
When the output of gate 195 is generated, it returns to low level. Therefore, outputs from the Q terminal and a terminal that outputs a signal opposite to the Q terminal are connected to AND gates 191 and 19, respectively.
2, and a double-sided automatic copy command signal (output of AND gate 190) at the other end of each.
When connected, the outputs of 191 and 192 are respectively,
During double-sided automatic copying, double-sided B copy and double-sided A copy commands can be provided. That is, when a double-sided automatic copy command is issued, the flip-flop 203 is initially at a high level.
The output of AND gate 192 becomes high level.
This command first commands double-sided A copying, and with that command, the A-side copy execution latch, ie, 167, goes high, and while the optical system is moving forward, Q 203 goes high.

Therefore, at that point, a double-sided B copy command is generated, and side A and B copies are automatically executed in order. Therefore, AND gate 191,1
92 outputs to OR gates 199 and 198, respectively.
By connecting the outputs of AND gates 189 and 188 to the other input terminals, the outputs of OR gates 199 and 198 can be used as double-sided B and double-sided A copy command signals, respectively. It can be used. That is, when the terminals 169, 171, 167, and 173 in FIG. 15 are at high level, they respectively issue a single-sided half-size copy, double-sided A, and double-sided B copy command.

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 that is generated at this time is the drum home position A, and when it is 3b, it is the drum home position B, and the next drum home position from the drum home position is the drum rotation unit. First, to explain the process of generation of the single-sided half copy execution latch signal 214, the single-sided half copy command input from the terminal 169 is as follows:
It is connected to the D terminal of flip-flop circuit 233 and also to one input terminal of AND gate 234. Therefore, when the drum home position signal coming to the other end of AND gate 234 already exists or is generated, the Q terminal of circuit 233 becomes high level, indicating that a single-sided half copy execution latch has occurred.

However, here the flip-flop circuit 231,
If the previous copy is a double-sided A copy, the transfer paper is set in the preparation position by the AND gates 230 and 229 as described above.
Until this is set, the drum home position signal is not applied to the other terminals of the AND gate 234. That is, the duplex A copy execution latch of the output terminal 216 is at high level, and
When there is no one-sided A copy command at input terminal 167,
The output of the AND 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 remains at a low level at the output terminal until the paper detection C signal (PDPC) indicating completion of the preparation position setting is input from the circuit 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, a high level signal will not be sent to the CP terminal of the circuit 233. Not entered. Therefore, at this time, the home position signal for the next drum is generated after it is input. However, at this time, both home positions A and B are inputted via the OR gate 228 as the drum home position signals.

However, next time you make a single-sided full-size copy,
Direct drum home position A to AND gate 2
By connecting to one input terminal of 32, the home position B of the drum becomes irrelevant at this time, and the single-sided full-size copy execution latch is generated, but the other processes are the half-copy execution latch. It is exactly the same as the input terminal 169,
AND gates 229, 234, circuit 233, and output terminal 214 are 171, 232, 23, respectively.
6,235,215, resulting in exactly the same developmental process. Next, the double-sided A copy execution latch generation process is exactly the same as the single-sided half copy execution latch generation process, except that there is no need to prevent the home position signal from being input to AND gate 238 to set the ready position. Further, the double-sided B copy execution latch generation process is generated in exactly the same process as the single-sided half copy execution latch generation process, and as a result, the output terminals 214, 215, 21
From 6,217, one side half, one side full,
The copy execution latches for double-sided A and double-sided B are set to high level and are output in accordance with each copy command. These outputs are then converted to 21 as shown in FIG.
The output of 4,216 is connected to the input terminal of OR gate 221, and this output is therefore led to output terminal 224 indicating the copy execution latch whose optical system advance stop position should be at position 138 in FIG. , and is further connected to one input terminal of the OR gate 222. Also, the other input terminal of 222 has 21
5 is connected, and the output of 222 is further connected to one input terminal of an OR gate 223. Also
The output of 217 is connected to the other end of OR gate 223, and the output of OR gate 223 is eventually 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.
AND gate 252 as a low level through 8
is applied to the input terminal of

Therefore, its output also becomes low level, and the transport rotation command output terminal 259 becomes low level and does not issue a command. This output is further connected to the inverter 257
AND gate 256 and 1/2 frequency divider (BM after bistable multivibrator) as high level through
) is connected to the R terminal of 251. In addition, in the flip-flop circuit 250, a drum home position signal is applied to the terminal CP, but at this time, the drum home position A signal (hereinafter referred to as DHPA) is directly connected to the OR from the terminal 210.
The drum home position B signal (hereinafter referred to as DHPB) is applied to the gate 255, but the drum home position B signal (hereinafter referred to as DHPB) is applied to the terminal 21.
1 to the other input terminal of 255 via AND gate 256, so OR gate 255
When the output terminal 259 is low level, the output of
When both the DHPA and DHPB signals appear and the terminal 259 goes high, only DHPA appears and is applied to the CP terminal of the terminal 250. Further, this signal is also simultaneously applied to the CP terminal of the BM terminal 251 via the inverter 253. Further, the output of the OR gate 254 is connected to the D terminal of the circuit 250, and 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 for it to reach the CP terminal of terminal 250 is much faster than the time for CPL to change through the various gates in the circuits of FIGS. 15 and 16. . 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 the same drum home position signal (hereafter
Only when CPL changes to low level due to the rise of DHP (written as DHP), terminal 259 becomes high level and issues a transport circuit command signal. This command is
When CPL becomes high level at the next rise of DHP, it is released by AND gate 252, but
If CPL does not rise during transport rotation, it will be released in the following sequence, that is, at this time, DHPB will:
Although it is not applied to the CP terminal of 250 by the AND gate 256, when the output of the OR gate 255 first falls, the reset signal of the BM251 becomes low level and the reset has already been released, so the output Q is Becomes a high level. Therefore, next 25
When a high-level rising voltage appears at the CP terminal of 0, the output of the OR gate 254 is CPL, which is already at a low level, but because of the output Q of the BM 251, it is at a high level. Therefore, at this time, the output Q of the circuit 250 maintains a high level. However, when the output of OR gate 255 changes to low level next time, the output Q of BM251 becomes low level, and since the output of OR gate 254 is already low level at the next rise of DHP, circuit 255
The output becomes low level, and the transfer rotation command of the terminal 259 is canceled.

Next, to explain the optical system movement command 113, in FIG.
6, 215 are the signals generated by the drum rotation described earlier using FIG. 12, namely, optical system movement start pulse A (hereinafter referred to as OTSA), optical system movement start pulse B (hereinafter referred to as OTSB), and The single-sided full-size copy execution latch (hereinafter referred to as FCPL) is input. OTSA directly OR gate 27
5 input terminal, and OTSB is AND gate 27
4 to the other input terminal of OR gate 275, and FCPL to the other input terminal of OR gate 275 via inverter 273.
Connected 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, when making single-sided full-size copies, only OTSA
For other copies, both OTSA and OTSB signals are output. In addition, input terminals 267, 268,
269 and 270 respectively show signals from the optical system position detection device shown in FIG.
(written as OBPA, OBPB) is input. Also, 2
Each of the input terminals 26, 173, and 224 has a copy execution latch (CPL), double-sided B copy command (BCCP), and half-stop copy latch (HSCL).
Each signal is input. First, the input and output of the circuit 272 will be explained. When output Q becomes high level, output terminal 2 is output through AND gate 280.
84 as an optical system forward latch (OFL) signal. However, since the output 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 is at a low level and is not output. Further, the output of the circuit 272 is output via an AND gate 281 to an output terminal 285 as an optical system backward latch (OBL) signal. Further, when the output Q is at a high level and the OFL signal can be outputted to the R terminal through the AND gate 280, the forward movement of the optical system is stopped and the backward movement is started. That is, an optical system back position signal is input as a reset signal to change the output Q from high level to low level.
However, as this optical system back position signal,
OBPB is input as is through OR gate 283, but OBPA is input via AND gate 282 and the HSCL signal connected to other input terminals. 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 applied as a high level from the terminal 226 to the D terminal of the circuit 272, when the optical system is at home position A and the terminal 269 becomes high level, or when double-sided B copying is executed, At home position B, AND
each connected to the input terminal of gate 276.
When the output of AND gate 276 becomes high level,
Since each signal is connected to the input terminal of OR gate 277, its output becomes high level. 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 used as a clock pulse.
The output of AND gate 278 is input to the CP terminal of circuit 272. Therefore, the output Q becomes high level and is outputted 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. Reach home position B
When the OHPB 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, the BCC
Since a high level signal is added, the output Q becomes a low level. This is AND gate 28
Since it is connected to the other input terminal of 0, its output becomes a low level, and the forward command from the terminal 284 is canceled. Therefore, at this time, the optical system stops at the home position B, but the next optical system movement start pulse is generated and the circuit 271
When applied to the R terminal of the motor, the output returns to high level and starts moving forward again. Next, as described above, an optical system back position signal corresponding to the type of copying that the optical system is performing is generated from the output of the OR gate 283 and applied to the R terminal of the circuit 272, resulting in an output Q.
becomes low level and the forward command is released. However, the output becomes high level and is outputted as the OBL output via the AND gate 281, so it 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, the BCCP signal becomes high level. If the next copy also indicates a double-sided B copy, the double-sided B copy command (BCCP) signal has already returned to low level when OHPB goes high or after the double-sided B copy is completed. In this case, when OHPA becomes high level, the output of OR gate 277 becomes high level, and a low level signal is applied from inverter 279 to AND gate 281, canceling the backward command.

Next, Figure 19 shows terminal 2 which commands the rotation of the drum.
This shows the process of generating the output of the 86 drum drive latch (hereinafter referred to as DDL).
As is clear from the previous explanation, rotation begins when CPL is at a high level or when a transfer rotation command (hereinafter referred to as FIL) is at a high level. That is,
FIL and CPL are input from terminals 259 and 226, respectively, and connected to an OR gate 283, whose output becomes DDL.

Next, in FIG. 20, transfer paper feed command signal 1
The developmental process of 17 will be explained. First, input terminal 212
A paper detection signal C (PDPC) is input to the . As described in the explanation of FIG. 15, this signal indicates that the back side copy preparation position has been set, and also indicates that the transfer paper is present 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 an input terminal of inverter 307. Also terminal 3
From 01 and 302, pulse signals generated at positions 140 and 141, respectively, by moving the optical system as shown in FIG. 12 are input. These are arranged to serve as 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. Also, a double-sided B copy execution latch signal is input from the terminal 217.
It is connected to the other input terminal of AND gate 303 via AND gate 305 and inverter 304 . 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, OR gate 30
6, the PFSB signal is input through the AND gate 305 during double-sided B copying, and the PFSA is input through the AND gate 303 during other types of copying. Furthermore, the paper feed start signal outputted via this OR gate 306 is output to the AND gate 3.
It is connected to one input terminal of 10. Also AND
Since the OFL signal is input to the other input terminal of the gate 310, the output terminal of the AND gate 310 receives the PFSA or
PFSB is output, and is output from terminal 342 as a paper feed timing pulse (PFSP) to other circuits.
Furthermore, it is also connected to one input terminal of each of AND gate 308 and AND gate 309. Therefore, at this time,
If the paper is set in the rear paper feed preparation position,
An output from the AND gate 308 is output to a terminal 340 as a paper feed command at the ready position, and if no paper is set at the ready position, a signal is output from the output of the AND gate 309 to a terminal 341 as a 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 carry out the present invention, when the preparation position set command signal is generated (in this example, the output from the terminal 218 in FIG. 15), the transfer paper is set to the preparation position in the following process. Can be set to First, the transfer paper passes through the fixing device 20 and is moved toward the tray 30 by the paper ejection roller 22. After the passage of the transfer paper is confirmed by the paper detection device A24, the transfer paper is moved to the paper ejection roller 22. The rotation of the paper ejection roller 22 is stopped while the paper is held in its grip, and the guide plate 26 is moved. After the above-mentioned lateral shift correction control is completed, the rollers 22 and 27 move the transfer paper in the direction of the roller 28. The paper is conveyed at high speed, and its leading edge is detected by the paper detection device C134. This stops this high-speed preparation position set rotation,
In response to the preparation position paper feeding command, the paper rotates normally and is conveyed to the transfer position via rollers 28 and 29. However, the conveyance method for the preparation position is not limited to the method described above; 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 set rotation, Another possible method is to stop the rotation and feed 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. In this embodiment, when the leading edge of the paper reaches the position of the paper detection device C134 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 and,
A paper feed command signal is generated, paper is fed from the cassette, and
The circuit shown in FIG. 18 will be explained by taking as an example the case where the time for the transfer paper to reach 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.
Also, the preparation position set command signal (PPSC) is input to terminal 2.
18 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 the AND gate 350, and when the signal from the paper detection device A24 rises from the terminal 345 to the other input terminal, 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, the output Q of the circuit 351 is high if there is no transfer paper at the position of the paper detection device C. 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 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. . At this time, the signal is input to the CP terminal of the rising circuit 355. At this time, since the PDPC signal is applied to the D terminal of the circuit 353 via the inverter 349, it is at a high level, and the output Q is at a high level. Output. 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, PDPC becomes high level, which is input to the R terminal of the circuit 353 and the output Q
is reset and HPFC is released.

Next, an example of a control circuit for correcting the lateral shift will be explained with reference to FIGS. 7 and 22. First, when the transfer paper is stopped while being caught by the paper ejection rollers 22 and 48, the paper detection device D70 (However, in this embodiment, this device is composed of the CdS 70, the lamp 71, and the shield plate 93. (However, it will be expressed as paper detection device D70 in the following explanation)
If no paper is detected, the reversible motor 90 is driven by the lateral shift correction control circuit so that the rollers 22, 48 move in the direction of arrow E in FIG.

On the other hand, if paper has already been detected, the reversible motor 90 is driven to move in the opposite direction, and the moment paper is detected and the moment paper is no longer detected, the reversible motor 90 stops rotating, and then the roller 22 ，
27 until the preparation position execution command (HPFC) is exhausted, and then the transfer paper is conveyed by the next preparation position paper feeding command. At this time, the trailing edge of the longest sheet of transfer paper that can be loaded into the copying machine after the paper feed command is issued passes the position of the paper detection device A. After the above period of time has elapsed, the rollers 22 and 4 moved for lateral deviation correction.
The reversible motor 90 is driven again so that 8 returns to its original predetermined position. However, in this embodiment, when the shielding plate 94 in the paper detection device A24 shifts laterally to the predetermined position of the rollers 22 and 48, the light from the lamp 49 that was blocked once again returns to the CdS2.
This position was taken as the position when the sensor returned to the position detected in step 4. FIG. 22 shows a lateral shift correction control circuit. In this figure, first, a signal (hereinafter referred to as
PDPD) is connected via terminal 360,
A preparation position execution command (hereinafter referred to as HPFC) is connected to the CP terminal via a terminal 355. Therefore,
When the Q terminal becomes high level, the reversible motor 90 moves the rollers 22,
48 is output as a signal indicating that it should move in the direction of arrow E in FIG. 8, and if the Q terminal is at a high level, it is output as a signal indicating that it should move in the opposite direction. Furthermore, the flip-flop circuit 366 is a circuit for outputting the output terminal Q at a high level for only the time period during which the reversible motor 90 should rotate, regardless of the rotational direction of the reversible motor 90.

First, when the D terminal is connected to the power supply and a rising signal is applied to the CP terminal, a high level signal appears at the Q terminal. First, to start the lateral shift correction, a rising signal of the HPFC input from the terminal 355 is applied to the CP terminal of the flip-flop circuit 366 via the OR gate 364, and the output terminal Q becomes high level. At this time, the flip-flop circuit 365 stores whether or not the transfer paper is detected by the paper detector D70. That is,
Assuming that it is not detected now, that is, assuming that the output of the flip-flop circuit 365 is at a high level,
The AND gate 376 outputs a horizontal movement command signal to the left (in the direction of arrow E in FIG. The control signal is output as SSLD from the terminal 382, and the reversible motor 90 is driven by this control signal. Also, if the transfer paper is detected by the paper detection device D
70, the Q output of the flip-flop circuit 365 becomes high level,
This is connected to one input terminal of the AND gate 374, and the other two input terminals are connected from the output terminal of the AND gate 374 to the OR gate 3 in exactly the same state.
A lateral rightward movement command signal is sent to the terminal 381 via 79.
is output as SSRD, and the reversible motor 90 is driven in the reverse rotation direction. Next, the transfer paper
For example, when the sheet is detected by the paper detection device D70 by moving in the horizontal left direction, the signal PDPD from the terminal 360 rises. This signal is connected to one input terminal of the AND gate 371, and at this time, since the output terminal and HPFC of the flip-flop circuit 365 are each connected to the other two input terminals as high level, the signal at the output terminal is stands up at this time. This signal is passed through OR gate 372 to R of flip-flop circuit 366.
Since it is connected to the terminal, at this time the circuit 366
is reset, the output terminal Q becomes a low level, the output SSLD becomes a low level via an AND gate 376 and an OR gate 380, and the lateral leftward movement is stopped. Also, if you are moving horizontally and to the right,
This time, when the paper detection device D70 no longer detects the transfer paper, PDPD becomes low level, and this signal is inverted by the inverter 367. That is,
This results in a high-level rising signal, which is applied to one input terminal of AND gate 370. The other two input terminals are exactly the same as AND gate 371, and the output of AND gate 370 rises and the OR
Through gate 372, flip-flop circuit 3
66. Also, when the signal from output terminal Q falls, AND gate 374 and OR gate 379
When the SSRD signal falls via , horizontal and rightward movement stops.

Next, the sequence to return to the predetermined position begins with terminal 2.
It is input from 12. Signal from paper detection device C
When the paper feed timing pulse PFSP is generated as described above when PDPD is at a high level, that is, when there is transfer paper at the preparation position, the AND gate 36
Since each is connected to the input terminal of 2,
At this time, a pulse is generated at the output terminal. This output is further input to the timer device 363, and after being delayed for the predetermined time described above, a pulse is output from the timer device 363, and is applied to the CD terminal of the flip-flop circuit 366 via the OR gate 364, causing the output terminal Q to go high again. level. As described above, at this time, HPFC has already become low level, and the signal that has become high level via inverter 368 is input to one terminal of AND gates 375 and 377. Therefore, when the output terminal of the flip-flop circuit 365 is at a high level, that is, according to the above sequence, the rollers 22,
If 48 is moving to the left, this output is
It is added to the other input terminal of AND gate 375. When the Q output terminal of the flip-flop circuit 366 becomes high level, this
Since it is applied to the other input terminal of the gate 375, the output rises at this time, and the SSRD rises again via the OR gate 379 and starts moving laterally to the right. Through this movement, the roller reaches a predetermined position, and as described above, at this time, the paper detection device A24
The light from the lamp 49 that was partially blocked by the movement of the shielding plate 94 is irradiated onto the CdS 24 again. When the falling signal of PDPA is input from the input terminal 345, a high level signal via the inverter 361 is input to one input terminal of the AND gate 373, and at this time, the Q signal of the flip-flop circuit 366 is input to the other input terminal. Since the output is input as a high level, the high level signal from the inverter 361 is applied to the R terminal of the flip-flop circuit 366 via the OR gate 372, the circuit 366 is reset, and the output Q becomes low level and the AND Gate 375, OR gate 379
SSRD falls via . Furthermore, when the Q output of the flip-flop circuit 365 is at a high level,
Through AND gate 377 and OR gate 380
When the SSLD rises and moves the displaced rollers 22, 48 to the left and returns to the predetermined position, the SSLD becomes low level and the reversible motor 90 is stopped in exactly the same manner as in the previous case.

Also, at this time, when the transfer paper passes the paper detection device A24 due to the high-speed preparation position setting and preparation position paper feeding, if there is almost no movement amount for lateral deviation correction and the rollers 22 and 48 are in the predetermined position. If it remains, the PDPA signal will fall at this time. Therefore, even if the paper feed timing pulse is generated, a delayed pulse is applied to the CP terminal of the flip-flop circuit 366 by the timer device, and the output Q rises, at that moment this rising signal is
Since it is applied to the R terminal of the circuit 366 via the AND gate 373 and the OR gate 372, the output Q immediately returns to a low level, and the horizontal movement command SSRD or
SSLD does not occur.

An example of an electric control circuit for implementing the present invention has been described above, but details of the following have been omitted to avoid complication of explanation. First of all, when the power is turned on, all outputs of each flip-flop are reset, and a contact type switching element such as a micro switch is used to generate the detection signal in each position detection device. I also omitted the explanation that these things all use chattering prevention circuits, although they do cause chattering. Furthermore, the driver circuits of each device that are driven according to each command are also omitted. Furthermore, the control circuit according to the present invention is by no means limited to the circuit described here.

As explained above, according to the configuration of the present invention, it is possible to accurately correct the positioning of a single-sided copied copy material that has been processed in the copy processing unit, so that even if the copy material is led to the copy processing unit again, the same processing is performed. This allows for easy alignment when copying.

Furthermore, since the means for sandwiching and moving the copy sheet laterally is a conveying means that first conveys the copy sheet toward a space where there is no sheet clamping means and can also convey the sheet in forward and reverse directions, one end of the copy sheet The copy sheet can be moved in the lateral direction while only the copy sheet is being held. Therefore, there is an effect that the copy sheet can be moved smoothly.

Furthermore, since the correction device is provided after the fixing by the fixing means, it is possible to correct lateral deviation of the copy sheet that occurs during fixing, for example, lateral deviation due to dimensional deformation due to heat fixing, and subsequent image formation can be performed satisfactorily. be.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an apparatus showing one embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams showing the relationship between double-sided copying and the optical system, Fig. 4 is an external view of the apparatus, and Fig. 5 is A front view of the operation panel of the device, FIG. 6 is an explanatory diagram of placing a document on the document table, FIG. 7 is a perspective view of the mechanism for back side copying, and FIG. 8 is an explanation of the means for correcting lateral deviation of the copying material. Figure 9 is an explanatory diagram of the placement of documents such as books in the case of right binding and left binding, Figure 10 is a block diagram of the electrical control system of this embodiment, and Figures 11 and 12 are the positions of the optical system. FIG. 13 is a digital logic circuit diagram used in this embodiment, FIG. 14 is a circuit diagram of a copy selection section, and FIGS. 15 and 16 are rotation control circuit diagrams of a photosensitive drum. , Fig. 17 is a circuit diagram of the conveyance rotation command (execution latch), Fig. 18 is a circuit diagram of optical system movement control, Fig. 19 is a circuit diagram for rotational driving of the photosensitive drum, and Fig. 20 is a circuit diagram of transfer material rotation. FIG. 21 is a circuit diagram for paper feeding control, FIG. 21 is a control circuit diagram for paper feeding preparation, and FIG. 22 is a control block diagram for the lateral deviation correcting means.

Claims (1)

[Scope of Claims] 1. A copying machine that guides a conveyed copy sheet to a copy processing section having a fixing section, performs single-sided copying and fixing, and then guides the copy sheet again to the copy processing section to make copies on the copy sheet. In the positional deviation correction device, a reversible and conveying device disposed on the downstream side of the fixing means, which pinches and conveys the single-sided copied copy sheet guided from the copying processing section toward a space where there is no sheet clamping means. a conveyance means movable in a lateral direction orthogonal to the direction; a control means for reversing the conveyance means with the rear end of the copy sheet being held by the conveyance means; a position detecting means for detecting the side edge position of the copy sheet, and a position detecting means for detecting the side edge position of the copy sheet; a control means for correcting the positional deviation of the copy sheet by moving the conveyance means in the lateral direction; and a conveyance path for guiding the copy sheet whose conveyance direction has been reversed by reversing the conveyance means to the copy processing section again. A positional deviation correction device for a copying machine.