JPH02306267A - Image forming device - Google Patents

Abstract

PURPOSE:To speedily set an image forming magnification by shifting a lens moving means in response to a change in a display numeric. CONSTITUTION:When a stepping motor 30 is normally and reversely rotated, a lens 14 moves horizontally in an optical axis via a driving wire 37 and is stopped in a position corresponding to a current magnification. The rotation of the motor 30 moves a moving body 41, that is, a mirror 15, back and forth in the optical axis via a cam 53 to correct the length of an optical path in response to the alteration of the magnification. When the moving body 41 moves back and forth, a pinion gear 59 rolls on a rack 60, and the mirror 15 rocks according to the peripheral shape of a cam 57 with a shaft 43 as a fulcrum, thereby correcting an exposure point. Thus, an image forming magnification can be speedily set.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image forming apparatus whose image forming magnification is changeable and allows an operator to select a desired image forming magnification.

Conventionally, so-called variable copy magnification type copiers that enlarge or reduce manuscripts can only set the copy magnification in predetermined stepwise magnifications. There was the inconvenience of not being able to do so. In addition, once the predetermined magnification is set in this way, even if there is a slight deviation from the exact value due to mechanical error or other factors, the user will not be able to perform any adjustment operations. I couldn't do it.

Problems to be Solved by the Invention For this reason, it is conceivable to set the copy magnification arbitrarily by external operation, but in this case, a specific value must be input to set the magnification, and it is difficult to obtain the desired copy. This method has the disadvantage that the magnification value must be determined by calculation or the like, and the input operation is also troublesome.

Furthermore, setting the magnification by inputting numerical values even when special magnification is requested on an ad hoc basis is inconvenient, such as increasing the number of memories more than necessary, and the operation is also troublesome. There is also.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide an image forming apparatus that allows a desired magnification to be set virtually steplessly, with extremely simple operation, and quickly.

Means for Solving the Problems In order to achieve the above-mentioned objects, an image forming apparatus of the present invention includes: an optical system including a lens; a lens moving means for moving the lens in order to change the imaging magnification; a numerical display means; , an operating means for increasing or decreasing the numerical value displayed on the numerical display means; a display control means for changing the numerical value displayed on the display means by a predetermined unit according to the operation of the operating means; and the operating means and a magnification control means for operating the lens moving means in response to a change in the numerical value displayed on the display means during the operation.

When the operation means for increasing/decreasing the cropping month value is operated, the data displayed on the numerical display means changes. During operation of the operating means, the lens moving means can also be moved in accordance with changes in the data to increase or decrease the imaging magnification. Therefore, the imaging magnification can be set quickly.

subjugation An embodiment of the present invention will be described below with reference to the drawings.

Copying mechanism FIG. 1 shows an example of an electrophotographic copying machine equipped with a magnification setting device according to the present invention. A photoreceptor drum 1 that can be rotated in a counterclockwise direction is disposed approximately in the center of the copying machine body, and a main eraser lamp 2. Sub charger 3. Sub eraser lamp 4. Main charger 5
．． Developing device6. Transfer charger 7, copy paper separation charger 8. A blade type cleaning device 9 is provided.

The photoreceptor drum 1 has a photoreceptor layer provided on its surface, and this photoreceptor is sensitized and charged by passing through the eraser lamp 2.4 and the chargers 3, 5, and the optical system 10
receives image exposure from.

The optical system 10 is installed below the original glass 16 so that the original image can be scanned, and includes a light source (not shown) and a movable mirror 11.
, 12, 13, a lens 14, and a mirror 15. The light source and the movable mirror 11 are connected to the circumferential velocity (V) of the photoreceptor drum l (at the same magnification).

(constant regardless of magnification) versus (v/n) (where n:
The movable mirror moves to the left at a speed of 12°1 (copy magnification).
3 moves to the left at a speed of (v/2 n),
It is driven by DC motor M3. When changing the copying magnification, the lens 14 moves on the optical axis and the mirror 15 moves and swings, but such a magnification changing device will be described in detail later.

On the other hand, there are paper feed rollers 21 on the left side of the copying machine body.
.
, a conveyor belt 27, a fixing device 28, and a pair of discharge rollers 29.

Next, a mechanism for moving lenses, mirrors, etc. for changing magnification will be explained with reference to FIGS. 3 and 4. This magnification change mechanism allows virtually stepless selection of magnification from enlargement to reduction, specifically from enlargement (Xl, 414) to same size (x1) to reduction (Xo, 647). The magnification up to can be selected as appropriate.

The magnification changing mechanism generally includes a lens moving mechanism 35, a mirror moving mechanism 40, a mirror swinging mechanism 55, and a stepping motor M4 that drives these.

The lens moving mechanism 35 has the lens 14 movably mounted on a guide rail 36 installed parallel to the optical axis, and rotates a drive wire 37 wound around a drive pulley 32 fixed to the output shaft 31 of the stepping motor M4. The drive wire 37 is stretched around pulleys 38, 38 which can be freely moved, and the middle part of the drive wire 37 is fixed to the side part of the lens 14.
By rotating the steering/knobbing motor M4 in forward and reverse directions at a predetermined rotation speed, the drive wire 3 is connected via the drive pulley 32.
7 rotates forward and backward, the rail 14 moves along the guide rail 36 on the optical axis in the left-right direction in FIG. 3, and is stopped at a position corresponding to the magnification.

The mirror moving mechanism 40 has a guide shaft in which the mirror 15 is fixed on the back side to a shaft 43 rotatably supported by a moving body 41, and side pieces 42 and 42 of this moving body 41 are installed parallel to the optical axis. 45, and a rotatable roller 44 provided at the end of the shaft 43 is placed on an auxiliary guide rail 46. Also, a bracket 49 is attached to the moving body 41.
The peripheral surface of a movable drive cam 53 comes into contact with the pin 50 provided through the pin 50, and the movable body 41 is urged toward the cam 53 by a coil spring 48 whose one end is fixed to the pin 47. A gear 33 fixed to the output shaft 31 of the stepping motor M4
The cam 53 meshes with a gear 52 fixed to one end of the support shaft 51, and the cam 53 is fixed to the other end of the support shaft 51.

Therefore, the rotation of the stepping motor M4 is controlled by the gear 33.
is transmitted to the cam 53 via the gear 52 and the support shaft 51,
The movable body 41, ie, the mirror 15, moves back and forth on the optical axis according to the shape of the circumferential surface of the cam 53, and corrects the optical path length as the magnification changes. That is, the lens 14 and mirror 15 are driven in conjunction with each other by a stepping motor M4 as the magnification changes, and their positional relationship is as shown in FIG. In addition, in the embodiment of the present invention, the rotation amount of the stepping motor M4 can be continuously adjusted in order to perform stepless magnification, but if this is done stepwise, a mechanism that selects several types of magnification is used. be able to.

On the other hand, the mirror swing mechanism 55 brings the peripheral surface of a swing drive cam 57 fixed to a rotatable support shaft 56 provided on the moving body 41 into contact with the back surface of the mirror 15, and moves the mirror 15 to the shaft 4.
The pinion gear 59 fixed to the support shaft 56 is engaged with the lever 60 attached to the main body of the copying machine, and the rack 60
extends parallel to the guide shaft 45. This mirror swinging mechanism 55 corrects the deviation of the exposure point where the optical axis of the light beam reflected by the mirror 15 hits the photosensitive drum 1 by simply moving the mirror 15 when changing the magnification. At this time, the mirror 15 is also swung so that the optical axis is directed to the same exposure point. That is, when the movable body 41 moves back and forth in accordance with the change in magnification, the pinion gear 59 is transferred on the rack 60, the cam 57 rotates together with the support shaft 56, and the mirror 15 moves around the shaft 43 in accordance with the circumferential shape of the cam 57. The exposure point is corrected by swinging around the fulcrum.

In this case, the swing angle of the mirror 15 is positioned such that the optical axis of the light beam reflected by the mirror 15 is directed toward the center of the photoreceptor drum 1 at maximum magnification (in this embodiment, at the time of magnification), and at smaller magnifications. For this, the optical axis is adjusted so that it is aligned with the same exposure point as the exposure point at maximum magnification.This is because the slit-shaped image is enlarged and projected, so the distortion of the exposed image is most noticeable. By making the light incident on the photosensitive drum 1 perpendicularly to the optical axis at the time of the maximum magnification that appears, distortion of the exposed image due to deviation in the angle of incidence is made inconspicuous as a whole.

FIG. 5 shows the arrangement of the operation keys on the operation panel of the copying machine. The operation panel 70 includes a print key 71 for starting the copying operation, a numerical display device 72 capable of displaying a four-digit numerical value. 1 and 2 respectively. ..., 9.
Numeric keypad 80, 89 corresponding to the value of O, interrupt key 90° for specifying interrupt copying, clear slide l-'y jib key 1. A paper selection key 92 for specifying copy paper loaded in multiple stages by size. Up and down keys 9 for changing and specifying TM photo image density in steps
3.94 and key group 9 related to the copying magnification setting device of the present invention
5 to 103 etc. are arranged.

The first group of magnification setting keys 95, 96, 97, and 98 are arranged for the purpose of arbitrarily setting the magnification, and when the key 99 for switching the first magnification setting mode is operated, the copying machine is controlled. When any key is operated while the mode is switched to the first magnification setting mode, the numerical value inputted by the numeric keypad and displayed on the display device 72 is
The copy magnification is stored in the memory corresponding to the operated key.

Second magnification setting key group 100, 101, 102° 103
have preset copy magnifications in their corresponding memories, and do not need to set numerical values as in the case of the first group of keys (but copying operations can be executed based on the preset numerical values). Therefore, the preset copying magnification is selected, for example, at the time of shipment from the factory, at a magnification that is considered to be normally used for brightness.This will be described in detail later.

In this way, the first group of keys allows the user to arbitrarily set the required copying magnification, and the second group of keys is generally used, for example, for domestic specifications, A4 → B5. B4→A4. A
3→A4. Alternatively, it is given a functional role such that the magnification corresponding to A4→A3 etc. is preset. However, since the numerical value preset for the second key group is a general or calculated copying magnification,
Due to mechanical or design errors, the actual copy may differ slightly from its copy magnification.

For example, even if you select the same size (×1), the actual size is (×1
．． 004) or (Xo, 996) times. In such a case, the control mode of the copying machine is switched to the second magnification setting mode by operating the second magnification setting mode switching key 104 shown in FIG. Set any numerical value in the memory corresponding to each key 100 to 103 with a simple operation,
It is possible to obtain the desired copy magnification. in particular,
A numerical value of 1.002 or 0.998 can be set for the same size key.

110 is a magnification display key used when setting the magnification according to the present invention, 111 is a magnification increase key, and 112 is a magnification decrease key.

FIG. 6 shows a control circuit used in the magnification setting device of the present invention, in which 201 is a first cPU, 202 is a second CPU,
0'3 is a battery-backed RAM, 204 is a switch matrix, and 205 is a DC motor M3 for document scanning.
206 is a stepping motor M4 for variable magnification.
207 is a decoder. Note that output terminal A
I to A7 are the main motor Ml, the developing motor M31, and the timing roller clutch CL, respectively.1. Upper paper feed clutch CL2, lower paper feed latch CL3. The charger 5° is connected to each drive switching transistor (FIG. 7) of the transfer charger 7.

Various data for copying operation control is written in the RAM 203 or shifted from the ROM in the CPU and stored therein.
Corresponding to the memory Ql.

Q2. Q3. As will be described in detail later, for example, when the selection key 100 is turned on, the magnification displayed on the display device 72 is written to or read out from the memory Ql, and when the selection key 100 is turned on, the magnification is is written to or read from the memory Q2.

In addition, for selection keys 95 to 98, memories Q5 and Q6 are
．． Q7. Q8 is provided in the same manner as described above, and for example, when the selection key 95 is turned on, the magnification is written to or read from the memory Q5.

FIGS. 8 to 17 are flowcharts showing processing procedures for setting magnification and controlling copying operations executed by the first CPU. The present invention will be specifically explained below based on this.

FIG. 8 is a flowchart schematically and comprehensively showing the processing procedure in the first CPU.

In steps Sl and S2, the above-mentioned memories Q1-
Presetting processing of the magnification for Q4 is executed. Details of this process are shown in FIG.

Step s3. In s4, when the copying machine is not in a copying operation, processing is executed to set magnifications A to H in association with the selection keys 95 to 98 or lOO to 103. Details of this process are shown in FIGS. 10 to 12.

In step S5, data for controlling the lens position and motor drive speed is transferred to the second CPIJ 202 in accordance with the magnification determined in step S4.

When transferring this data, the second CPU 202 processes it by interrupt.

Details of step S5 are shown in FIGS. 13, 14, and 17.

In step S6, other processes such as controlling the temperature of the heater of the copying machine and determining the size of copy paper are collectively shown.

In step S7, processing for controlling the copying operation is executed. Details of this process are shown in FIG. In addition, the first
FIG. 6 is a time chart showing the operation.

FIG. 9 is a flowchart showing details of initial sector processing for presetting predetermined numerical values in the memories Q1 to Q4 corresponding to the eleventh groups 100 to 103 for second magnification setting. The initial switch in step S1 in FIG. 8 is a switch set in a position in the copying machine that cannot normally be operated, so that it can only be released during assembly at a factory or by a service person, for example.
The process shown in FIG. 9 is executed only when this switch is operated.

The numerical values preset in the memories Ql to Q4 are determined by the on/off states of the switches associated with the operation of the keys 105 and 106 shown in FIG. Alternatively, at the factory shipping stage, etc., a worker turns on and off switches 105 and 106 according to a combination determined in advance by the destination, etc., and sets the initial switch to blank, thereby storing a predetermined value in memories Q1 to Q4. The value will be preset. The next process is to switch 1 stored in the first cPtJ201.
05.106 for the combination of on and off in each memory Ql-Q4, and specific examples of preset values for the combination of on and off of the switches 105 and 106 are shown in Table 1.

Table 1 When setting numerical values as copy magnifications in the memories Q1 to Q8 corresponding to selection keys 95 to 98 and 100 to 103, the processes shown in FIGS. 10 to 12 are executed.

In FIG. 10, in steps 5IOI and 5IO2, when the key 99 or 104 is operated to switch to the copy magnification setting mode, the first. It is determined for which second key group magnification setting is requested. key 99
When is operated, the mode is the first copy magnification setting mode,
Set flag A to "1". When the key 104 is operated, flag B indicating the second copy magnification setting mode is set to “1”.
Set.

When the key 99 or 104 is operated, in either case, in step S10.3, 5105, a process is executed in which the 1000th place flag is set to "1" and the display of the 1st place is set to "0". That is, when the control of the copying machine is switched to the magnification setting mode, the numerical display device 72 displays "bbb o" (b is blank) and enters a standby state in which input is accepted from the 1000th digit.

If the numeric keypad is operated in this state, step 5107
The type of the key is determined in step 3108 and "1" is displayed in the 1000th place only when "11 cow - 80". Numerical values input using expressions such as 10th place and 1st place will be explained, but the numerical value as a magnification is treated as a decimal number with 3 digits after the decimal point and 4 significant digits.

When the 1000th place flag is 1″, the input value is 0
Or in the case of 2 to 9, proceed to step 5110 and set 100.
“0゛′” is displayed in the 0th position.Next, if the input is “O”, proceed to step 5109 as well as if the input is “1”, and display 1.
Set the 000th flag to “o゛°,” and set the 100th flag to “1.”
” and wait for input to the 100th place digit. If the input is 2 to 9, set the 1000th place flag to 0” in step 5112, then proceed to step 5115 and change the input value to 100.
Display in digits.

The processing described above when the 1000th place flag is 1'' is based on the premise that values in the range of 0.647 to 1.414 are treated as valid copy magnifications, and therefore, the 1000th place flag is Only 1'' or “O” can be displayed. Also, by doing this, “
This simplifies the key operation when inputting 0". Even if such processing is performed, depending on the number entered below the 100th place, the number may fall outside the range of the above effective copy magnification. The processing in this case will be explained in the subroutine section of FIGS. 11 and 12.

When a value is entered in the 1000th place digit, the 100th place flag becomes “1”, and when the numeric keypad is operated in this state, 10
The numerical value corresponding to the manipulated cow is entered in the 0th digit, and in step 5115 that numerical value is displayed, and in step 8116 a process is executed in which the 100th place flag is set to "0" and the 10th place flag is set to "1". Hereinafter, the input of the 10th place and the 1st place are also performed by operating the numeric keypad.

The flowchart of FIG. 11 shows the process of storing the numerical values input and displayed in the process of FIG. 10 in the memory corresponding to the next operated selection key.

In step 5201, first, it is determined whether the mode is the first magnification setting mode or the second magnification setting mode. Since step 5201 is executed only when either flag A or B is "1", here, for example, only the determination of whether flag A is "l" is executed; If ", it is the first magnification setting mode, so the process advances to step 8218 and subsequent steps to determine the operation of the first selection key group 95 to 98. If flag A is not "1",
That is, when flag B is "1", it is the second magnification setting mode, so the process advances to step 5202 and subsequent steps to determine the operation of the second group of selection keys 100-103.

In the process shown in FIG. 11, in any magnification setting mode, the displayed numerical value is basically stored in the memory corresponding to the operated selection key. However, as described above, at this stage, a value that is not within the range of permissible copying magnifications may be displayed.

Therefore, in the process shown in FIG. 11, after determining the operation of each key, the subroutine shown in step 5203 is executed to prevent numerical values outside the permissible range from being stored in the memory. The process of step 5203 is shown in FIG.

In FIG. 12, if the display is not °°0'', then in step 5230 the displayed value is 0.64.
Determine whether it is smaller than 7, and if it is smaller, proceed to step 5.
231 and the display is set to 0.647.

Also, in step 5232, the displayed value is 1.4.
It is determined whether or not it is greater than 14. If it is greater, the display is set to 1.414 in step 5233.

Therefore, to explain in relation to FIG. 11, when a predetermined selection key is operated in the magnification setting mode, if the displayed value is outside the allowable range, the display is changed to the allowable limit value and then the display is changed to the allowable limit value. Stores the numeric value in the memory corresponding to that key. When the process of storing numerical values in the memory is executed, the flag A is set to "0" in the first magnification setting mode, and the flag B is set to "0" in the second magnification setting mode, and the process advances to step 8206.

Steps 8206 to 5208 show processing when the clear stop key 91 (see FIG. 5) is operated. When the clear stop key 91 is pressed, step 520
7, 3208, "'bbb l" is displayed on the display device 72.
is displayed, and flags A and B are set to 0''. That is, when the clear stop key 91 is operated, the displayed numerical value is cleared and the magnification setting mode is canceled. , the number “1” displayed by this
" is "1°°, which is the standard setting value for the number of actual images.

13 and 14 show the second selection key group 100~
103 and the first selection key group 95 to 98 are operated.

In FIG. 13, keys 100, 101, 102 and 1
03 is operated, light emitting diodes 100a, 101a,
The one corresponding to the operated key among 102a and 103a (see FIG. 5) is lit, and then the second CPU 202 uses the numerical value stored in the memory as magnification data.
The process then proceeds to step 5406 in FIG.

In FIG. 14, when any of the selection keys 95 to 98 is operated, in this case, the corresponding light emitting diode is turned on as described above, and an arbitrary magnification is set, so steps 5402, 5408, 5415 and 542
At 0, the numerical values set in the corresponding memories Q5 to Q8 are displayed on the display device 72. This display is set, for example, only when each key is pressed, and when the key is released, the number of copies set in another storage device is called up and displayed on the display device 72. There is. Also in the case of this first group of selection keys, if the numerical value stored in the memory corresponding to the operated key is not "O", the numerical value is sent to the second CPU 202 as magnification data.
If it is “0”, the process advances to step 5412.

FIG. 17 shows the increase key 111. 7 is a flowchart showing a magnification setting method by operating a decrease key 112. FIG.

In this case, the process passes through step E in the flowchart of FIG. 14 and proceeds to step 5501 of FIG. 17. The rising edge at which the increase key 111 is turned on is determined, and if YES, in step 5502, one of the light emitting diodes 95a to 103a corresponding to the currently selected magnification key is turned off, and in step 5503 Set the auto-increment timer. Then, as will be described later, when this automatic increase timer finishes counting a predetermined period of time, for example, 0.5 seconds, step S522. S 523), increase key 111
Generates the same rising signal as when turning on.

Then, in step 5504, the CPU 201 increases the magnification by 1 unit (for example, 0.002), and in step 5
Proceed to 505. Steps 5505 and 5506 have a magnification of 1
．． Determine whether it does not exceed 414, and the magnification is 1.41.
It is limited to 1.414 so that it does not become larger than 4.

The magnification is sent to the second CPU 202 in step 5507,
As described above, the second CPU 202 controls the lens position through interrupt processing and enables copying at the set magnification.

Also, in steps 5518, 5519, 5520, the increase key 111. It is determined whether either the decrease key 1121 or the magnification key 110 is turned on, and only when YES, the magnification is displayed on the display device 72.

Then, the process proceeds to the next step 5522, reads the time counting state of the increment timer, and, for example, when 0.5 seconds have passed after the timer is reset, it is assumed that the increment timer has finished counting in step 5522, and a YES determination is made. key 11
A signal similar to the rising edge of 1 is emitted. Then, the process returns to step 5501 again. The above operation is repeated while the increase key 111 is turned on, and the magnification increases by 0.002 every 0.5 seconds.

When the increase key 111 is turned off, the falling edge of the increase key signal is determined, and the process proceeds to step 5509, where the increase timer is reset and the change in magnification is completed.

When the decrease key 112 is turned on, step 3501
．． The process advances to 5510 via 5508, and if it is determined that the decrease key 112 is on, the process proceeds to step 3511.
1L light emitting diode 95a that corresponds to the magnification key
103a is turned off, and in step 5511, an automatic decrement timer is set. Then, at step 5512, the magnification is decreased by 0.002 every 0.5 seconds.

This operation continues as long as the decrease key 112 is turned on. If the magnification is 0.646 or less, step 55
14 limits the magnification to 0.647 and prevents it from decreasing below that.

The above-mentioned magnification setting operation is performed to modify the magnification already stored in the memories Q1 to Q8, and after completing one or a series of copying operations using the modified magnification. returns to the original magnification.

In addition, if you turn on the increase key ill only once for a short time,
The unit amount can increase the magnification by 0.002. When the decrease key 112 is turned on only once for a short period of time, the magnification is decreased by one unit.

Also, increase key 111. When the decrease key 112 is operated, the numerical value displayed on the display device 72 is not changed, and the numerical value read before the key is operated is continued to be displayed, while the number of times the magnification has changed may be displayed on a separate display device, Alternatively, the display lamp may simply be blinked every time the numerical value changes.

Also, increase key 111. If the decrease key 112 is kept on, the rate of change of the numerical value may be increased in accordance with the time of operation.

The above is an explanation of the setting operation in the magnification setting device of the present invention. As is clear from this explanation, according to this magnification setting device, any copying magnification required by each user can be easily set using the first magnification setting mode, and the magnification can be set at any time as necessary. You can check the set magnification on the display and use the value as control data for the copying machine. In addition, according to the second magnification setting mode, the work is mainly to correct the magnification by reading the error with the numerical copy magnification from the copy actually obtained with a preset predetermined copy magnification. The effect achieved is that this can be carried out very easily.

Further, by operating the increase key I L This type of operation is effective when using a copying magnification that is not often used.

With respect to the numerical value set in this way, the movement of the lens 14 is controlled by the interrupt processing of the control device 206 based on the output of the second C, P U 202 in accordance with the copying magnification. For example, the stepping motor M4 is controlled to rotate in both forward and reverse directions so as to rotate by one pitch with respect to a numerical value of 0.001 or 01002. Therefore, the magnification may be changed by 0.002 by operating the increase key 111 and the decrease key 112, and the display may be associated with the smallest unit in which the copy magnification can be adjusted. In addition, a second
It is controlled by a control device 205 based on the output of the CPtJ, 202, but many methods have been proposed or provided in the past regarding the speed control of the DC motor that is the drive source, and will not be described in detail here. .

In FIG. 5, the panel portion 70a adjacent to the first group of selection keys 95 to 98 can be configured as a whiteboard that can be written on and erased with a predetermined writing instrument, a removable adhesive sticker, or a panel that can be attached and detached by magnetic force. It is convenient for use if the magnification of the numerical value set arbitrarily by the user is used, for example, to write characters such as "Paper → A4J".The panel part 70a is recessed with other panel parts as necessary. Alternatively, a convex step may be provided.

Copying Operation FIG. 15 is a flowchart showing an example of controlling the copying operation of the copying machine. This will be briefly explained with reference to the time chart of FIG. 16.

In block 10, when the print switch is turned on, the main motor Ml, the developing motor M2 . Charging charger 12. Each of the transfer chargers 14 is activated, a copy flag indicating that a copy operation is in progress is set to "1", and a control timer T-
Start A, T-B, and turn on the clutch of the paper feed roller on the selected side.

In block 11, the end of the timer TA is determined and the paper feed clutch is turned off.

In block 12, the end of timer T-B is determined, and
Turn on the scan motor M3 to start the scan operation.

In block 13, when the timing signal is output during the scan operation, the timing roller
3 is turned on, and a process of setting timer TC is executed. The copy sheet is conveyed by the timing roller 35 in synchronization with the image on the photoreceptor drum 10.

In block 14, it is determined that the timer TC has ended, and the charging, scan motor, and timing roller clutch are turned off. Note that the timer TC may be set variably depending on the size of the copy sheet used.

In block 15, when the optical system returns to the home position due to the return operation and the home position switch is turned on, the developing motor M2. Each transfer charger 14 is turned off, the copy flag is set to °゛O゛, and the timer T is turned off.
-D is set.

In block 16, it is determined that the timer TD has ended, and the main motor M1 is turned off. Professional.

17 executes processing for various outputs.

Note that the timer T-A-T-D, etc. explained in the above flowchart and time chart is one of the processes of the MC 50 that is executed within the time specified by the internal timer 7-.
This is a digital timer that is programmed to count up by 1" in a routine, and the time-up time is stored as numerical data.

Effects As detailed above, this invention allows the copying magnification to be set steplessly and corrected in units of ■ by an extremely simple operation, making it possible for the user to copy at any magnification at any time and with ease of operation. Above all, it is extremely convenient. Moreover, the error between the preset copying magnification and the actual copying magnification can be corrected at the user level, making it possible to obtain accurate variable-magnification copies.

Further, since the lens moving means is operated in accordance with the operation of the increasing/decreasing means, the apparatus quickly becomes ready for operation at a desired image forming magnification.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a copying machine to which the present invention is applied;
2 is a diagram showing the positional relationship of lenses in the copying machine shown in FIG. 1, FIG. 3 is a perspective view of the mirror moving mechanism in the copying machine shown in FIG. 1, and FIG. FIG. 5 is a plan view showing the operation panel of the copying machine shown in FIG. 1, FIG. 6 is a block diagram showing an embodiment of the present invention, and FIG. The output circuit diagram used, FIG. 8 is a flowchart showing a schematic operation of the main part of the present invention, FIG. 9 is a flowchart showing a specific magnification setting program, and FIG. 10 is a flowchart showing an example of a method for displaying a set magnification. Fig. 11 is a flowchart showing details of the magnification setting program, Fig. 12 is a flowchart showing details of subroutines in the setting program of Fig. 11, Fig. 13 is a flowchart showing a series of specific magnification programs, Fig. 14 is an arbitrary Flowchart showing the magnification reading program, Fig. 15 is a flowchart showing the copying operation, Fig. 16 is a waveform diagram showing the main part of the copying operation shown in Fig. 15, Fig. 17 is correcting the magnification using the increase key and the decrease key. It is a flowchart showing the operation. 72...Display device, 71...Print switch, 80~
89...Numeric keypad, 95-98. too~103...
- Selection key, 111...Increase key, 112...Decrease key.

Claims (1)

[Claims] (1) An optical system including a lens, a lens moving means for moving the lens to change the imaging magnification, a numerical display means, and an operating means for increasing or decreasing the numerical value displayed on the numerical display means. and display control means for changing the numerical value displayed on the display means by a predetermined unit in accordance with the operation of the operation means, and responding to the change in the numerical value displayed on the display means while the operation means is being operated. and a magnification control means for operating the lens moving means.