JPS6046543A - Copying machine - Google Patents

Abstract

PURPOSE:To control the movement of an optical system through simple constitution by controlling the starting and stopping positions of an optical system for exposure with the number of pulses determined by the side of an original or copying paper. CONSTITUTION:A control part 37 instructs a coincidence circuit 38 to set the number of pulses on the basis of signals inputted from various switches 35 and 36, etc., and drives a motor driving circuit 39. The motor driving circuit 39 rotates or reverses a driving motor 15 according to the control signal from the control part 37. When the driving motor 15 is rotated, a pulse generator 18 generates pulses, which are counted down by a pulse counting circuit 40, whose output is inputted to the coincidence circuit 38. The coincidence circuit 38 outputs a signal to the control circuit 37 when the set number of pulses coincides with the number of pulses applied from the counting circuit 40.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a copying machine that is capable of dividing a document placed on a document table into a right side and a left side, and copying each side independently. Regarding.

(Prior Art) The copying machine of the above type is suitable for copying a document such as a book, that is, a document whose side is divided into a right side and a left side when placed on a document table. .

For example, if you want to copy both the right side and the left side, you can divide the movement range of the exposure optical system into the right side copying area and the left side copying area, so that you do not have to move the book original placed on the document mounting table. It is also possible to copy the left and right sides. In particular, in a copying machine capable of double-sided copying, double-sided copying can be performed without moving the book original, which has the great effect of shortening the copying time.

By the way, when copying each side of a document, not limited to book manuscripts, where a single document has left and right document surfaces, the exposure optical system has a length corresponding to half the length of the document in the direction of movement. It is designed to move only the area.

For this purpose, a means for detecting the position of half of the document is provided to control the movement range of the exposure optical system. On the other hand, there are various sizes of originals, and in order to detect the half position of all sizes of originals, it is necessary to provide a number of detection means corresponding to the size of the original. , there is a problem that the configuration becomes complicated. However, if the original document placement table is simply made partial, there are problems in that the method for placing the document becomes cumbersome, and a wasted area is created in the movement area of the optical system, resulting in an increase in copying time.

(Objective) The present invention was made in order to solve the above-mentioned defects and problems, and it is an object of the present invention to provide a copying machine that can set the movement area of an exposure optical system with a simple mechanism.

(Structure) The copying machine of the present invention generates a pulse corresponding to the amount of movement of the exposure optical system, detects the copy size, and makes a copy.
The feature is that the movement area of the optical system is controlled according to the mode.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

In FIG. 1, the reference numeral 1 indicates a document mounting table made of a transparent glass plate, and the reference numeral 2 indicates a photosensitive drum rotating in the direction of the arrow. An exposure optical system 3 is disposed between the document table 1 and the photosensitive drum 2. This optical system 3 consists of an illumination light source 4, a reflecting mirror 5, 6, 7, an imaging lens 8, and a reflecting mirror 9. The illumination light source 4 and the reflecting mirror 5 are integrally supported by a support 10 (see FIG. 2). In FIG. 2, the support body 10 is a document mounting table l.
It is slidably supported by a guide shaft 11 provided in parallel with. Near the guide shaft 11, a pair of goo'J 12.
A twisted wire 14 is stretched around the wire 13.

A portion of the wire 14 is fixed to the support 10. Further, the wire 14 is wound around a driving shaft 7 fixed to an output shaft 16 of a driving shaft 15. When the drive motor 15 rotates reversibly, the support 1-0 reciprocates along the guide shaft 11. The movement area of this support 1o will be described later. A pulse generator 18 is provided on the output shaft 16 of the motor.
are connected.

In FIG. 1, when the illumination light source 4 and the reflecting mirror 5 move forward at a speed V, the reflecting mirrors 6 and 7 are moved by a drive motor 15 and a wire 14 so that they move forward at a speed of 1/2V. It will be done. Around the photoreceptor drum 2, well-known chargers 19. Developing device 20. Registration roller pair 21. Transfer device 221 Separator 232 Separation conveyance device 24. A pair of registration rollers 21 in which cleaning devices 25 are arranged in this order are provided on a paper feed path 26. Paper feed passage 26
are a double-sided paper feed section 27, a first paper feed section 28. Second paper feed section 29
It is connected to the. Each paper feed section includes a tray that stores copy sheets, a paper feed roller that separates and feeds the copy sheets stored in the tray, and a pair of conveyance rollers that transports the separated sheets. Only one of the paper feed units operates depending on the copy size and copy mode selected. Still, the first one. The second paper feed section is provided with a detection means for detecting the size of the copy paper that can be accommodated in the second paper feed section.

A fixing device 30 is arranged on the right side of the separation and conveyance device 24. This fixing device 30 is connected to a path for conveying the fixed copy paper. In the case of a single-sided copy mode, which will be described later, the copy paper is sent out of the machine by a pair of paper ejection rollers 31. When the duplex copying mode is selected, the copy paper that has been fixed on the first side is led to the reversing path 32 by means not shown, and then passes through the duplex copying path 33 in a switchback manner to be fed into the duplex paper feed. It is sent to section 27.

The pulse generator 18 (see FIG. 2) is configured to output one pulse depending on the amount of movement of the exposure optical system, for example, every time the optical system moves 1 mm.

Therefore, by counting the output pulses, the position of the optical system can be known.

The relationship between the number of pulses and the position of the exposure optical system will be explained based on FIG. 3. Note that in the following description, an A3-sized document table 1 will be taken as an example. In this case, the length of the mounting table 1 is 420 ynm. A certain run-up distance is required until the exposure optical system starts to move at a constant speed, but in the case shown, the run-up distance is 100 mm. That is, the left end of the document mounting table 1 is the reference edge on which the document is placed, and a position further lQQmm to the left from there is the home position of the exposure optical system. In FIG. 3, the position indicated by the symbol C is the position reached when the optical system starts from the home position indicated by the number 0 and counts 310 pulses. It is exactly in the middle of 1.

In the document mounting table 1, the left side from the center position C is called the left side, and the right side is called the right side R. If we replace this with the number of pulses, the range between 100 and 310 is left facing, and between 310 and 310
The area between 520 and 520 is the right surface R. The exposure optical system in the copying machine of the present invention has two starting positions corresponding to copy modes. The individual copy modes will be described later, but the starting position from the position where the number of pulses is 0 is called the first starting position A (see Figure 3 (GL (force, (e))), and from the position where the number of pulses is 210. from the second starting position B (same figure (
b), (C)). The number of pulses 210 at the second starting position B is a value when the copy size is A4 size.

The copy mode is divided into a left side copy mode for copying only the left side, a right side copy mode for copying only the right side R, and a full page copy mode for copying the entire left and right sides. Further, by combining the left-side copy mode and the right-side copy mode, it is possible to adopt a double-sided copy mode for sheet-like originals and a double-sided copy mode for book originals.

Referring to FIG. 4, a drive control circuit for the exposure optical system will be explained. The size detecting means 34 may be a means for detecting the size of the original placed on the original placing table 1, or the first. It may be a means for detecting the size of the selected copy paper stored in the second paper feed section 28, 29. The copy mode selection switch 35 is a switch for selecting each of the above-mentioned copy modes, and as shown in FIG.
Right → left.

It consists of four parts: left → right, and right only. In addition, the left side L (
There is no special switch for selecting the modes of copying only (see Figure 3) and copying the entire left and right sides, and the moving area of the exposure optical system is unique depending on the size of the selected copy paper. It is now determined that The print switch 36 is a switch for starting the exposure process, but
The exposure optical system is configured to move to the starting position in the selected mode before the print switch 36 is pressed. The control unit 37 instructs the coincidence circuit 38 to set the number of pulses and drives the motor drive circuit 39 based on the signals input from the various switches. The motor drive circuit 39 reversibly drives the drive morph 15 in response to a control signal from the control unit 37 . Drive motor 1
5 rotates, the pulse generator 18 generates a pulse. These pulses are added/subtracted by a pulse counting circuit 40 and inputted to a matching circuit 38. The matching circuit 38 is connected to the control section 37
When the number of pulses set by and the number of pulses added from the counting circuit 40 match, the signal is sent to the control circuit 3.
Output to 7.

Although it has already been explained that there are various copy modes, the operation of each copy mode will be explained below with reference to FIGS. 3 and 4. In FIG. 1, the first paper feed section 28 has an A3
It is assumed that A4 size copy paper is stored in the second paper feed section 29.

■ Single-sided copy mode This mode is for copying only on one side of copy paper, and there are three modes: left-side copy mode, right-side copy mode, and right-side full-page copy mode.

■-i Left-side copy mode This mode copies only the portion of the original placed on the left side of the original placed on the original platen 1, as shown in Figure 3 (, z). It is.

In this mode, there is no need to operate the copy mode selection switch, and the copy paper size is A4.
Just choose your size. Since the copy mode selection switch is not operated, the exposure optical system starts moving from the first starting position A. If there is no optical system at this first starting position A, the optical system is moved to the first starting position A where the pulse is O when the copy paper size is selected.

This mode selection, i.e. copy paper size (A4)
By selecting , the control unit 37 causes the minus number circuit 38 to
At the same time as inputting the value of , the pulse counting circuit 4° is converted to amplifier counting mode.゛When the print switch 36 is pressed, the controller 37. The drive motor 15 rotates forward via the motor drive circuit 39 to move the exposure optical system from the first starting position A.

At this time, the pulse generator 18 generates a number of pulses corresponding to the amount of movement of the optical system, the pulse divider circuit 7IO counts and adds the pulses, and inputs the result to the matching circuit 38.

When the optical system is moved to the right end position C on the left side, the total number of pulses is 310. Therefore, when the preset number of pulses matches the added number of pulses, the minus number circuit 38 outputs a signal to that effect to the control unit 37.

The control unit 37 uses this signal to control the motor drive circuit 39.
At the same time, a value of 0 is input to the coincidence circuit 38, and the pulse counting circuit 40 is converted to the down-count mode. When the drive motor 15 reverses, pulses are generated accordingly, and these pulses are input to the matching circuit 38 while being subtracted by the pulse counting circuit 40. When the number of pulses reaches O, the minus number circuit 38 outputs a coincidence signal to the control section 37. This signal controls the control unit 3.
7 issues a motor stop signal to the motor drive circuit 39. At this time, the exposure optical system, specifically the illumination light source 4 and the reflecting mirror 5, have been returned to the first starting position A.

The above is a description of the movement of the optical system. When the print switch 36 is pressed, A4 size copy paper is sent out from the second paper feed section 29. Then, the toner image of the document image located on the left surface L (see FIG. 3), which is irradiated onto the photosensitive drum 2 by the exposure optical system, is transferred onto this copy paper. The copy paper onto which the toner image has been transferred is transferred to the fixing device 30. The paper is discharged outside the machine via a pair of paper discharge rollers 31.

Note that if you want to obtain multiple copies from one original, operate a copy number setting device (not shown) and input a set number signal to the control section 37. The system is caused to reciprocate in the movement area shown in FIG. 3 (α) a number of times corresponding to the set number of sheets.

1- i i Right side copy mode In this mode, only the part of the original placed on the right side I (of the original placed on the original platen 1) is copied, as shown in FIG. 3(c). mode.

This mode is selected from the copy mode selection switch 35.
Selected by pressing ``Right only'' (see Figure 5). On the other hand, the types of manuscripts include book manuscript BO as shown in Fig. 6(a), and sorted manuscript SF as shown in Fig. 6(h).
There is. Each of the illustrated documents has two A4 size document surfaces.

When these originals are opened and placed on the document mounting table 1, as shown in FIGS. 7 and 8, they will be placed on substantially the entire surface of the A3-sized document mounting table 1. This mode is selected when it is desired to obtain one copy of each page from these originals. For example, in FIG. 7(α), a copy of the third page of the book manuscript BO is obtained in the left-side copy mode, but when trying to copy the second page in the left-side copy mode, the manuscript BO is moved to the left. need to be moved. Therefore, in this mode, the right side R is copied without moving the original. By selecting "right only" on the copy mode selection switch 35 and selecting the first paper feed section 29 for using A4 size copy paper, the control section 37 converts the pulse counting circuit 4o to the up-count mode. , - inputs the number of pulses 210 to the number circuit 38, and drives the drive motor 15 via the motor drive circuit 39' to move the exposure optical system. When the number of pulses due to the rotation of the drive motor 15 reaches 210, the minus number circuit 38 outputs a coincidence signal to the control section 37.

Upon receiving this signal, the control unit 37 outputs a motor stop signal to the motor drive circuit 39 and also outputs a signal to the coincidence circuit 38 to stop the motor.
Enter a value of 0. As a result, the optical system is stopped at the second starting position B.

When the print switch 36 is pressed, the control unit 37. The drive motor 15 rotates forward via the motor drive circuit 39 to move the exposure optical system from the second starting position B, as shown in FIG. 3(C). At this time, the pulse generator 18 generates a number of pulses corresponding to the rotational speed of the motor, that is, the amount of movement of the optical system.

These pulses are counted and added by a pulse counting circuit 40 and input to a matching circuit 38. Then, the optical system is on the right side R.
When it is moved to the right end, the total number of pulses is 52.
Since the number of pulses is 0, the matching circuit 38 outputs a signal to the control unit 37 indicating that the number of pulses matches. Based on this coincidence signal, the control section 37 issues a motor reversal signal to the motor drive circuit 39, inputs a numerical value of 210 to the coincidence circuit 38, and converts the pulse counting circuit 40 to a down-count mode.

When the drive motor 15 reverses, the pulse generator 18 generates pulses, which are subtracted by the pulse counting circuit 40 and input to the matching circuit 38. Then, when the number of pulses reaches 210, the coincidence circuit 38 outputs a coincidence signal to the control section 37. Based on this signal, the control section 37 issues a signal to the motor drive circuit 39 to stop the motor. At this time, the exposure optical system has been returned to the second starting position B and is stopped at this position. Note that the other copying steps, except for feeding out the copy paper by pressing the print switch 36, are the same as those in the left side copying mode, so a description thereof will be omitted. Original table 1
If you want to obtain multiple copies from the original placed on the right side R of the machine, operate a copy number setting device (not shown) and input a set number signal to the control section 37. , the exposure optical system reciprocates in the movement area shown in FIG. 3(c) a number of times corresponding to the set number of sheets.

1 for each page from the manuscript paginated in the order shown in Figure 6.
When it is desired to obtain multiple copies, by sequentially selecting the left side copy mode and the right side copy mode, copying can be performed page by page without moving the original placed on the original table 1.

■-i i i Left and right full copy mode In this mode, as shown in Fig. 3(e),
This mode copies the entire surface of the original placed on the machine. Similar to the left side copy mode, this mode does not require operation of the copy mode selection switch 35, and only requires the user to select A3 size as the copy paper size. A3 size copy paper is stored in the first paper feed section 28. By not operating the copy mode selection switch, the exposure optical system starts moving from the first starting position A. If the optical system is not located at this first starting position A,
When the copy paper size (A3) is selected, the optical system is moved to the first starting position A, and the control unit 37 inputs the value 520 to the matching circuit 38, and sets the pulse counting circuit 40 to the amplifier count mode. Convert to When the print switch 36 is pressed, the controller 37. The drive motor 15 rotates forward via the motor drive circuit 39 to move the exposure optical system from the first starting position A. The subsequent movement of the optical system and the copying process are the same as in the left side copying mode.

The difference is that when the number of pulses reaches 520, the motor 15
is reversed, and A3 size copy paper is fed from the first paper feed section 28.

■ Double-sided copy mode This mode is for copying on both sides of a sheet of copy paper, and the first double-sided copying mode copies each page of the original placed on the document tray 1, replacing each page page by page. The mode is roughly divided into a copy mode and a second double-sided copy mode in which two-page originals (see FIG. 6) are copied on both sides without being replaced. The former mode uses the optical system movement areas shown in Figures 3(α) and 3(C), and the latter mode uses the optical system movement areas shown in Figures 3(h) and 3(d).
'), , (in the case of a book manuscript, the movement area is a combination of (C) in the same figure). In addition, if the multi-copy mode is selected in the latter mode, Fig. 3(a)
A moving area based on the combination of and (c) in the same figure is used.

Regardless of which mode is selected, if duplex copying is to be performed, the "duplex" switch of the copy mode selection switch 35 (see FIG. 5) is pressed.

(2)-i First double-sided copy mode This mode is used to copy both sides of a document when there are a large number of original pages each having one page.

Assuming that there are many A4 size originals, this is A4 size.
The case of duplex copying on four sizes of copy paper will be explained. Place the first page of the original on the left side of the original placing table 1. Next, press the copy mode selection switch 35 and select A as the copy paper.
Press the switch to select 4 sizes. At this time, if the exposure optical system is not located at the first starting position A, the control section 37 controls the drive motor "5" via the motor drive circuit 39.
The optical system is moved to the position A by reversing. In response to the A4 size copy paper selection signal, the control section 37 inputs 310 to the matching circuit 38 and also inputs 310 to the pulse counting circuit 40.
cent to up-count mode.

When the print switch 36 is pressed, the drive motor 15 is rotated forward via the control unit 37 and the motor drive circuit 39 to move the exposure optical system from the first starting position A. At this time, the pulse generator 18 generates a number of pulses corresponding to the amount of movement of the optical system. This pulse is transmitted to the pulse counting circuit 4
o is counted and added and input to the matching circuit 38.

When the optical system is moved to the right end position C on the left side, the total number of pulses is 310. Therefore, the matching circuit 38 outputs a signal that matches 310 that has been input in advance. Based on this coincidence signal, the control section 37 controls the drive motor 1 via the motor drive circuit 39.
5 is reversed, 0 is input to the coincidence circuit 38, and the pulse counting circuit 40 is switched to the down count mode.

When the drive motor 15 reverses and the pulse becomes O, the coincidence circuit 38 outputs a coincidence signal to the control section 37. Control part 3
7 issues a motor stop signal based on this signal. At this time, the exposure optical system has been returned to the first starting position A.

On the other hand, when the print switch 36 is pressed, A4 size copy paper is being fed from the second paper feeding section 29. Then, on the first page of this paper, the original image of the first page is copied. After exiting the fixing device, the copy sheet is guided to a reversing path 32, from which it is fed into a duplex paper feed section 27 via a duplex copying path 33 in a switchback manner.

Next, when the original on the left side of the original placing table 1 is replaced with the one on the second page and the print switch 36 is pressed, as shown in FIG. The exposure optical system moves back and forth. In the process of copying the second page, copy paper is fed from the duplex paper feeder 27, and copies are made on the second side. The copy paper that has been copied onto the second side is
The sheet is discharged to the outside of the machine by a pair of paper discharge rollers 31.

The above is an explanation for the case of double-sided copying from an A4 size document with one page per sheet. However, when double-sided copying is performed from an A3 size document, the exposure optical system is as shown in Figure 3 (g).
The copy paper moves back and forth in the movement area shown in
The paper is fed from the double-sided paper feed section 27.

ll-7i 2nd double-sided copy mode As shown in Figure 6, this mode is for duplex copying of each page of an open book or a document with two original pages per sheet without moving the document. Therefore, Fig. 6 (α
There is a book original double-sided copying mode shown in ), a sheet-like original double-sided copying mode shown in FIG.

H-ii-i Book manuscript double-sided copy mode Book manuscript BO paged as shown in Figure 6 (α) is copied to Figure 7 (cLL
The original is placed on the original placing table 1 as shown in (h). In this case, the second page is placed on the right side R, and the third page is placed on the left side.

The copy mode selection switch 35 is set to “Double-sided” and “Right → Left”
is pushed. Furthermore, since A4 size copy paper is used, paper feeding from the second paper feeding section 29 is selected. These signals are input to the control section 37.

Based on these signals, the control section 37 inputs the numerical value 210 to the matching circuit 38 and also sets the pulse counting circuit 40 to the amplifier count mode. At this time, matching circuit 3
If the numerical value 210 exists in 8, that is, if the optical system is located at the second starting position B, a coincidence signal is immediately output, and the control unit 37 inputs the numerical value 520 into the coincidence circuit 38. . When the optical system is located at the first starting position A, the control unit 37 rotates the drive motor 15 via the motor drive circuit 39 to move the optical system to the second starting position B. When a coincidence signal is issued at this position B, the control section 37 outputs a numerical value of 520 to the minus number circuit 38.

When the print switch 36 is pressed, the drive motor 15 is rotated in the forward direction via the control unit 37 and the motor drive circuit 39, and the exposure optical system is moved from the second starting position B as shown in FIG. 3(h). move it to At this time, the pulse generator 18 generates a number of pulses corresponding to the amount of movement of the optical system. This number of pulses is counted by the pulse counting circuit 40 and input to the matching circuit 38.

Then, when the number of pulses reaches 520, that is,
When the optical system finishes scanning the right surface R, the minus number circuit 38 outputs a coincidence signal. The control section 37, which has received the coincidence signal, outputs a motor reversal signal to the motor drive circuit 39, sets the pulse counting circuit 40 to down count mode, and inputs the value of O to the minus number circuit 38.

On the other hand, by pressing the print switch 36, the second page of the book manuscript BO is copied onto the first side of the A4 size copy paper fed from the second paper feed section 29. After fixing, this copy paper is discharged to the outside of the machine via a pair of paper discharge rollers 31.

When the drive motor 15 reverses and the number of pulses reaches O,
-Number circuit 38 outputs a coincidence signal. In response to this signal, the control section 37 issues a signal to the motor drive circuit 39 to stop the motor, issues a signal to switch the pulse count circuit 40 to the up-count mode, and gives a numerical value of 310 to the minus number circuit 38. At this time, the exposure optical system is stopped at the first starting position A, as shown in FIG. 3(d).

When the print switch 36 is pressed, the control section '37. Drive motor 15 via motor drive circuit 39
rotates in the normal direction to move the exposure optical system from the first starting position A as shown in FIG. 3(d). At this time, A4 size copy paper is fed from the second paper feeding section 29. Then, when the number of pulses reaches 310 and the minus number circuit 38 outputs a coincidence signal, the control section 37 outputs a motor reversal signal to the motor drive circuit 39 based on this signal, and the pulse counting circuit 40 outputs a motor reversal signal to the motor drive circuit 39. It outputs a signal for switching to the down-count mode, and also inputs the numerical value 210 to the matching circuit 38.

When the drive motor 15 rotates in reverse and the number of pulses generated by the pulse counting circuit 40 reaches 210, the minus number circuit 38 outputs a coincidence signal. In response to this signal, the control section 37 outputs a motor stop signal to the motor drive circuit 39, switches the pulse counting circuit 40 to the amplifier count mode, and gives a numerical value 520 to the matching circuit 38.

At this time, the exposure optical system is stopped at the second starting position B.

On the other hand, the copy sheet on which the third negative number of the book original BO placed on the left side is copied passes through the reversing path 322 and the duplex copying path 33 to the duplex paper feed section 27 (see FIG. 1) after being fixed. He was sent there and waited here.

When copying of the third page is completed, the pages of the book manuscript BO are turned over, the fourth and fifth pages are opened, and these are placed on the manuscript table 1. At this time, the 4th page is on the right side R, and the 5th page is on the right side R.
Each page is placed facing left.

Thereafter, when the print switch 36 is pressed, the exposure optical system moves through the movement area shown in FIG. 3 (/I) already explained, and reaches the first starting position A. At this time, the fourth page of the book manuscript BO is to be copied, but the copy paper at this time is kept waiting in the double-sided paper feed section 27.
A copy sheet is used on which the third page is copied on the first side. Therefore, the third page has been copied on the first side of the copy sheet, and the fourth page has been copied on the second side. Second
After the copy paper has been copied onto the surface of
1, it is ejected from the machine.

Next, when the print switch is pressed, the exposure optical system moves through the movement area shown in FIG. .

In this mode, the pages of the book manuscript are turned over when the left-sided copying is completed.

As mentioned above, double-sided copying of a book manuscript is performed using <h
> and (the force cannot be repeated. Note that (b) is (d
), there is no need to turn over the pages of the document, so the optical system may be moved continuously without pressing the print switch.

-1i-ii Multi-sheet book original double-sided copy mode This mode is a mode in which a plurality of copies are obtained from each page of a book original. The optical system in the above mode is one in which copies are made continuously on both sides of a sheet of copying paper by continuously and alternately moving the force movement area (h) in Figure 3. In this mode, the right side R original image is continuously copied onto the first side of a desired number of copy sheets, and the copy sheets are temporarily stacked and stored in the duplex paper feed section 27, and then, While feeding this copy paper, left-sided original images are successively copied onto the second side of the paper to complete double-sided copying.

The original is placed as shown in FIGS. 7(α) and (A).

Prior to pressing the print switch, "both sides" and "right only" of the copy mode selection switch 35 are pressed, and at the same time, the number of copies is set by a copy number setting device (not shown), and copies are made at the same time. Select paper size, in this case A4? Select the second paper feed section 29 that stores the size.

These signals are input to the control section 37 (see FIG. 4). The control unit 37 inputs the numerical value 210 to the coincidence circuit 38 and switches the pulse counting circuit 40 to the amplifier count mode. When the exposure optical system is located at the second starting position B, the value of the matching circuit 38 is changed to 520, and when it is not located at the second starting position B, the motor 15 is rotated via the motor drive circuit 39. After the optical system is positioned at the second starting position B, the numerical value is changed to 520.

When the print switch 36 is pressed, the control section 37 rotates the motor drive circuit 39 to rotate the drive motor 15 in the forward direction, thereby moving the exposure optical system as shown in FIG. 3(c). On the other hand, A4 size copy paper is fed from the second paper feed section 29 . When the number of pulses generated as the drive motor 15 rotates, that is, the optical system moves, reaches 520, the coincidence circuit 38 outputs a coincidence signal. At this time, the forward movement of the optical system has ended. The control unit 37 that has received the coincidence signal outputs a morph reversal signal to the motor drive circuit 39 and also inputs a numerical value 210 to the coincidence circuit 38 .

At the same time, the pulse counting circuit 40 is switched to down count mode. By reversing the drive motor 15, the optical system moves back and forth. Then, when the number of pulses reaches 210, the coincidence circuit 38 outputs a coincidence signal, and the control section 37 that receives this outputs a motor stop signal. As a result, the optical system returns to the second starting position B after completing the exposure of the right surface R, that is, the second page (see FIG. 7(α)). On the other hand, the copy sheet on which the second page has been copied on the first side is fed into the double-sided paper feed section 27 via the reversing path 321 and the double-sided copying path 33 after being fixed.

When returning to the second starting position B, if the copying process for the predetermined number of sheets has not yet been completed, the control unit 37 controls the coincidence circuit 38
A numerical value of 520 is input to , the pulse counting circuit 40 is switched to the amplifier count mode, and a monitor normal rotation signal is output to the motor drive circuit 39 . This causes the drive motor 15 to rotate forward and move the optical system as shown in FIG. 3(C).

Further, new copy paper is fed from the second paper feed section 29. Thereafter, by repeating the same process as described above, a set number of copy sheets with the second page of the book manuscript copied on the first side are stored in the double-sided paper feed section 27. Then, the optical system is installed as many times as the set number of copies (see Figure 3).
During the final copying of the right surface R, the moving area shown in FIG.

The optical system positioned at the first starting position A is moved through the movement area shown in FIG. 3 (α) by pressing the print switch or automatically. The action of the control circuit at this time is exactly the action shown in FIG. 3 (α), so its explanation will be omitted. In this case, the third negative side (left side L) of the book manuscript BO is copied, and the copy paper used for this is stored in the duplex paper feeder 27, and the second side A sheet of paper on which a page has already been copied and which is to be copied on its second side. The copy paper that has been copied onto the first side and the second side is discharged from the machine via a pair of paper discharge rollers 31.

This left-facing copying operation is repeated for the set number of copies.

■-1l-iil Sheet original double-sided copy mode This mode is used to copy A3 size sorted originals that have two original sides, the first page and the second page, as shown in FIG. 6(A).
In this mode, a double-sided copy of A4 size is obtained from F, and the moving areas shown in FIGS. 3(A) and 3'(d) are used.

As shown in FIG. 8, the sheet-like original SE is placed with the first page on the right side R and the second page on the left side.

Prior to pressing the print switch, "both sides" and "right to left" of the copy mode selection switch 35 are pressed to select the copy paper size, in which case the second paper feed section 29 is selected. These signals are input to the control section 37. Control part 3
7 inputs the numerical value 21 to the minus number circuit 38 based on these signals.
0 is input and the pulse counting circuit 40 is set to up count mode. At this time, if the numerical value 210 exists in the minus number circuit 38, in other words, if the optical system is located at the second starting position B, the circuit 38 immediately outputs a coincidence signal, so that the control unit 37 inputs the numerical value 520 to the match circuit 38. When the optical system is located at the first starting position A, the control section 37 rotates the drive motor 15 via the motor drive circuit 39 to move it to the second starting position B with the number of pulses 210. This coincidence signal at position B causes the control section 37 to output the numerical value 520 to the coincidence circuit 38.
Enter.

When the print switch 36 is pressed, the drive motor 15 rotates forward via the control unit 37 and the motor drive circuit 39, and the exposure optical system is moved from the second starting position B as shown in FIG. 3(b). move it to At this time, the pulse generator 18 generates a number of pulses corresponding to the amount of movement of the optical system. This pulse is counted by the pulse counting circuit 40 and -
It is input to the number circuit 38.

Then, when the number of pulses reaches 520, -number circuit 3
8 outputs a match signal. At this time, the optical system is at the position where it has finished exposing the first page of the right surface R. The control unit 37, which has received the coincidence signal, outputs a motor reversal signal to the motor drive circuit 39, switches the pulse counting circuit 40 to down count mode, and inputs a value of 0 to the minus number circuit 38.

On the other hand, by pressing the print switch 36, the first page of the sheet original SE is copied onto the first side of the A4 size copy paper fed from the second paper feed section 29. After the copying paper is fixed, it passes through the reversing path 32 and the double-sided copying path 33.
The paper is fed into the double-sided paper feed section 27, where it waits in preparation for copying on the second side.

When the drive motor 15 reverses and the number of pulses becomes 0,
-Number circuit 38 outputs a coincidence signal. In response to this signal, the control unit 37 outputs a signal for normal rotation of the motor to the motor drive circuit 39, switches the pulse number circuit 40 to the up-count mode, and inputs a numerical value 310 to the minus number circuit 38. At this time, the exposure optical system is moved to the first starting position A.
will be temporarily stopped.

When the drive motor 15 is rotated forward, the exposure optical system moves from the first starting position A as shown in FIG. Then, the waiting copy paper is supplied to the duplex paper feed section 27. When the number of pulses accompanying the movement of the optical system reaches 310, the minus number circuit 38 outputs a coincidence signal. In response to the signal, the control section 37 outputs a motor reversal signal to the motor drive circuit 39, switches the pulse counting circuit 40 to the down count mode, and outputs the numerical value 21 to the coincidence circuit 38.
Enter 0. The drive motor 15 reverses and the pulse is 2.
When the number reaches 10, the minus number circuit 38 outputs a match signal.

In response to this signal, the control unit 37 outputs a motor stop signal to the motor drive circuit 39, and the -number circuit 38 outputs a numeric value of 5.
At the same time as inputting 20, the pulse counting circuit 4o is switched to up-count mode.

At this time 1, the exposure optical system is stopped at the second starting position B. On the other hand, the second page of the sheet-like original SF is copied onto the second side of the copy paper fed from the double-sided paper feed section 27. Therefore, two sheets of the original sheet are on both sides of this copy paper.
This means that the images on each page have been copied, and after being fixed, they are discharged outside the machine.

After double-sided copying of the first sheet original SF is completed,
When the next ()-1. document is placed on the document table 1 and the print switch 36 is pressed, the optical system moves through the movement areas shown in FIG. 3(b) and FIG. 3(d) in this order. Become.

(2)-1i-iv Multi-sheet double-sided copy mode This mode is a mode in which a plurality of double-sided copies are obtained from one notebook-like original.

The operation and effects of this mode are described in ■-ii above.
Since it is the same as the double-sided copying mode of multi-sheet book originals in -ii, the explanation thereof will be omitted.

The above description is based on A4 size originals, but there are a wide variety of originals including B4 size, B5 size, and A5 size. Therefore, when attempting to control the movement of the exposure optical system capable of copying the right side R or double-sided copying using these originals, it is necessary to set various optical system movement areas depending on the original size.

In Figure 9, (α) to (g) each page is A4
The size indicates the movement area of the optical system when copying a document with two pages, and (α)′~<ef is the movement area of the optical system when copying a document with two pages, and (α)′~<ef is that of a document with two pages where one page is B5 size. It shows. Note that (α) to (g) are the same as those shown in FIG. 3, but are shown for comparison with B5 (B4) size. In Figure 9, <J
-(J corresponds to (α) to (e)K above, and the difference is that the length of the forward movement is A-C-+A-C,
It only changes based on the difference between A size and B size, such as BD-+B-D or DA→DA.

What we can see from this Figure 9 is that A3 size and B4 size
The inversion positions C (C'), D (D') and the stop position B (B) of the exposure optical system are different depending on the two original sizes. In addition,
Reference numeral B indicates the second starting position when copying a B5 size document.

In the present invention, the start position and stop position of the exposure optical system described above are controlled by the number of pulses determined by the original size or the copy paper size, so it is not necessary to arrange many switches on the movement trajectory of the optical system. do not have.

In other words, the movement of the optical system can be controlled with a simple configuration.

Furthermore, when making multiple double-sided copies of half the size of a single original, there is no need to move the original, so the copying speed is not slowed down and the operability is improved.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a copying machine according to the present invention;
Figure 2 is a front view showing an overview of the driving device of the exposure optical system;
Figure 3 is a diagram showing the movement area of the exposure optical system when an A4 size document is placed on an A3 size document table and various copy modes are selected, and Figure 4 is an example of the control circuit. FIG. 5 is a plan view showing an example of a copy mode selection switch, FIG. 6 (α) is a block diagram showing a book manuscript, FIG.
A) is a perspective view showing each note-like manuscript, and FIG.
), (h) is a plan view and a front view showing a state in which a book manuscript is placed on a document placing table, FIG. 8 is a front view showing a state in which a sheet manuscript is placed on a document placing table, and FIG. FIG. 3 is a diagram illustrating an example of a document size and a movement area of an exposure optical system according to the document size. 1 Document placement table, L...Left side, R...Right side, 3.
...Exposure optical system, 12. 13. 17...Pulley, 14...Wire, 15...Motor, 18...Pulse generator, 27...Double-sided paper feed section, 28...First paper feed section, 29...Second paper feed Part, 30... Fixing device, 32.
...Reversing path, 33...Double-sided copying path, 31...Paper discharge roller pair, 34...Size detection means, 35...Copy mode selection switch, 36...Print switch, 37
. . . control unit, 38 . . . - number circuit, 39 . . . motor drive circuit, 40 . . . pulse counting circuit. 7) Ryo1 (ii most 1 zu〆■δ shaku

Claims (1)

[Claims] A document placed on a document table is divided into a right side and a left side,
A copying machine capable of copying each side independently has an optical system drive device that moves the exposure optical system back and forth, a left side copy mode that copies only the left side of the original, and a left side copy mode that copies only the right side. a copy mode selection means for selecting a right-side copy mode and a full-page copy mode for copying the entire left and right sides; a copy size detection means for detecting the size of the original placed on the original table and/or the size of the copy paper; and an optical system. A pulse generator that generates pulses corresponding to the amount of movement; pulse counting means that counts the pulses generated by the pulse generator; and copy mode selection means. In response to input signals from the copy size detection means and the pulse number means, the optical system is moved from the first starting position of the right and left full copy reservoir, or the second optical system is moved a predetermined distance from the first starting position. The optical system driving device is characterized by comprising a control circuit that controls the operation of the optical system driving device by selecting whether to move it from a starting position and to stop it at a first starting position or a second starting position. Copying equipment.