JPH02306266A - Image forming device - Google Patents

Abstract

PURPOSE:To correct the difference between any magnification and an actual one at any point by forming an image at a magnification according to selected numerical data. CONSTITUTION:When a stepping motor 30 is normally and reversely rotated with a prescribed revolving speed, a lens 14 moves horizontally in an optical axis along a guide rail 36 via a driving wire 37, and is stopped in a position corresponding to the 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 in response to the change in the magnification, the mirror 15 rocks according to the peripheral shape of the cam 57 with a shaft 43 as a fulcrum, and an exposure point is corrected. Thus, a copying magnification is readily set point by point; therefore copying at any magnification is attainable at any point.

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.

Conventional technology Copying machines with variable copying magnification that enlarge or reduce originals can only set the copying magnification in predetermined stepwise magnifications, and therefore cannot copy at magnifications between each step. That was an inconvenience. Furthermore, once the predetermined magnification is set in this way, even if the actual copied magnification deviates slightly from the correct value due to mechanical error, the user cannot 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 for special magnification requests only on a temporary basis may be 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 an object of the present invention is to provide an image forming apparatus in which a desired magnification can be set virtually steplessly and with an extremely simple operation.

Means for Solving the Problems In order to achieve the above-mentioned object, an image forming apparatus of the present invention includes an image forming means, a storage means capable of storing numerical data of one summer number, and a storage means for storing the numerical data stored in the storage means. selection means for selecting one of them; selection display means for displaying which numerical data has been selected by the selection means; magnification control means for setting the numerical data selected by the selection means as a copy magnification; A numerical value display means, and a numerical value increase/decrease means for increasing or decreasing the numerical value displayed on the numerical value display means, and the magnification control means is configured to increase or decrease the numerical value displayed on the numerical value display means when the numerical value increase/decrease means is activated. is set as a copying magnification, and the display by the selection means is inactivated.

(g) When one numerical data is selected by the river selection means, that numerical data is read out from the storage means, the numerical data is displayed on the display means, and the magnification control means is operated according to the selected numerical data. An image is formed by the image forming means at the magnification.

On the other hand, when the magnification data displayed on the numerical display means is increased or decreased by the numerical increase/decrease means, the magnification control means is operated according to the increased or decreased magnification data, and an image is formed with the increased or decreased magnification.

Example 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. Approximately in the center of the main body of the copying machine, a photoreceptor drum l that can be driven to rotate in a counterclockwise direction is arranged, and around it are main eraser lamps 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 is provided with a photoreceptor layer on its surface, and this photoreceptor is sensitized and charged by passing through the eraser lamps 2 and 4 and the charging chargers 3 and 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 photosensitive drum 1 (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 a DC motor M3. When changing the copying magnification, the lens 14 moves on the optical axis and the mirror 15 moves and swings. 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 paper feed section 20, 22 equipped with 23 is installed, and the copy paper conveyance path is provided with a pair of rollers 24, 25, a pair of timing rollers 26,
It is composed of 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 and 38, and the middle part of the drive wire 37 is fixed to the side of the lens 14. Therefore, by rotating the stepping motor M4 forward and backward at a predetermined rotation speed, the drive wire 37 is rotated forward and backward via the drive pulley 32, and the rail 14 is moved along the guide rail 36 on the optical axis as shown in FIG. It moves left and right and stops at a position according 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 of the moving body 41 are set 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 circumferential surface of a movable drive cam 53 contacts the bin 50 provided through the movable body 41, and the movable body 41 is urged toward the cam 53 by a coil spring 48 whose one end is fixed to a 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 rack 60 attached to the main body of the copying machine.
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 photoreceptor drum l by simply moving the mirror 15 when changing the magnification, and changes 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 response to a change in magnification, the pinion gear 59 moves on the rack 60, the cam 57 rotates together with the support shaft 56, and the shaft 43 rotates depending on the peripheral surface shape of the mirror 15 or 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, it is adjusted so that the exposure point is the same as the exposure point at the maximum magnification.
Since the slit-shaped image is enlarged and projected, the distortion of the exposed image is most noticeable.By making the light incident perpendicularly to the photosensitive drum l on the optical axis at the maximum magnification, the exposed image due to the deviation of the incident angle can be obtained. This makes the distortion less noticeable.

Control device FIG. 5 shows the arrangement of each operation key on the operation panel section of the 1st summer photographic 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
, 0 corresponding to the numerical values 80, 89 . Interrupt key 90° to specify interrupt copy Clear/stop key 91
．． A paper selection key 92 for specifying copy paper loaded in multiple stages by size. Up and down keys 93 for changing and specifying the copy image density in steps.
94 and a group of keys 95 to 95 related to the copying magnification setting device of the present invention.
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. mode or the first magnification setting mode, when any key is operated, the numerical value inputted by the numeric keypad and displayed on the display device 72 will be changed to the first magnification setting mode.
The copy magnification is stored in the memory corresponding to the operated key.

Second magnification setting key group 100, 101, 102° 103
has a predetermined copy magnification set in its corresponding memory in advance, and the copying operation can be executed based on the preset numerical value without having to set numerical values as in the case of the first group of keys. It is considered as such. Therefore, the preset copying magnification is selected, for example, from a magnification that is considered to be commonly used for the leading cylinder at the time of factory shipment. This will be explained 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, the magnification corresponding to A4→A3, etc. is given a role with a functional upper limit, such as being preset. However, since the numerical value preset for the second key group is a general or calculated copying magnification,
Due to mechanical errors or design-L errors, the actual copy may differ slightly from its copy magnification.

For example, even if you select the same size (Xl), 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 1002 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,
03 is a battery-backed RAM, 204 is a switch matrix, 205 is a drive circuit for a DC motor M3 for document scanning, 206 is a drive circuit for a stepping motor M4 for variable magnification, and 207 is a decoder. Note that output terminal A
t to A7 are the main motor Ml, the developing motor M3, the timing roller clutch CLI, the upper paper feed clutch CL2, the lower paper feed latch CL3 . Charger 5゜Transistor for each drive switching of transfer charger 7 (
(Fig. 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 7 memory Ql, and when the selection key 101 is turned on, the magnification is read out. The magnification is written to or read from 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 St and S2, the memory Ql-
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, a process for setting magnifications A to H in association with each of the selection keys 95 to 98 or 100 to 103 is executed. 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 CPU 202 in accordance with the magnification set 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 the initial setting process for presetting predetermined numerical values in the memories Q1 to Q4 corresponding to the second magnification setting key groups 100 to 103. 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 memory Ql-Q4 are determined by the on/off state of the switch associated with the operation of the keys 105 and 106 shown in FIG. Alternatively, at the factory shipping stage, the worker or the destination turns on and off the switches 105 and 106 according to a combination predetermined by the supplier, etc., and leaves the initial/yield switch blank to store the predetermined information in the memories Ql to Q4. The value will be preset. The next process is to use the switch 10 stored in the first cPU 201.
5.106 is set in each memory Ql-Q4, and specific examples of preset values for the on/off combinations of switches 105.106 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 group of keys magnification setting is requested. key 99
When is operated, the mode is the first copy magnification setting mode,
The flag A is set to "1pa." When the key 104 is operated, the flag B indicating the second copy magnification setting mode is set to "pi."

When the key 99 or +04 is operated, in either case, in steps 5I03 and 5105, processing is executed in which the 1000th place flag is set to "0" and the display for the 1st place is set to "0". That is, when the copying machine is controlled or switched to the magnification setting mode, the numerical display device 72 displays "bbbO" (b is blank), ioo.

It is in a standby state where human power is applied from the digit.

If the numeric keypad is operated in this state, step 5I07
The type of key is determined in step 5108 and "1" is displayed in the 1000th place only when the key is I-1 or J-80. In addition, here, for the sake of convenience in relation to the numerical display device 72, the numerical values input are explained as 1000th place, 100th place, 10th place, and 1st place, but the numerical value as a magnification is 3 digits after the decimal point and 4 significant figures. Treated as a decimal number of digits.

If the 1000th place flag is "1" and the input numerical value is O or 2 to 9, step SLi is executed.

, and display “O” at the 1000th place. Then, if the input is ``10'', step 510 is performed as well as if the input is ``1''.
Proceed to step 9, set the 1000th flag to "0°", set the 100th flag to "1"°, and wait for input to the 100th digit. If the input is from 2 to 9, set the 1000th flag to "0" in step 5112. ”, proceed to Step 1.B 5115 and display the entered numerical value in the 100th digit.

The process described above when the 1000th flag is “1” is as follows:
This is based on the premise that numerical values in the range of 0.647 to 1.414 are treated as valid copying magnifications, and therefore only "l" or "0" can be displayed in the 1000th digit. Moreover, by doing this, the key operation when inputting "0" into the 1000th digit is simplified.

Incidentally, even if such processing is executed, depending on the numerical value inputted below the 100th place, the numerical value may fall outside the range of the above-mentioned effective copying magnification. The processing at this time will be explained in the subroutine sections of FIGS. 1I and 12.

When a value is entered in the 1000th place digit, the 100th place flag becomes “pi”, and if the numeric keypad is operated in this state, 100
A numerical value corresponding to the key operated in the digit digit is input, and in step 5115, the numerical value is displayed, and in step 5116, a process is executed in which the 100th place flag is set to "o" and the 10th place flag is set to "1". . Thereafter, 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. Step 5201 is executed only when either flag A or B is "1", so here, for example, only the determination of whether flag A is "1" is executed, and flag A is "1". If the flag A is not "l", the mode is the first magnification setting mode, so the process proceeds to step 5218 and subsequent steps to determine the operation of the first selection key group 95 to 98. If the flag A is not "l", that is, the flag B is "1" When ``'', the mode is the second magnification setting mode, so the process advances to step 5202 and subsequent steps in which the operation of the second selection key group 100-103 is determined.

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 3203 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++", the displayed value is 0.647 in step 5230.
Determine whether the value is smaller than
31, the area 647 is displayed.

Also, in step 5232, the displayed value is 1.4.
It is determined whether or not it is greater than 14, and if it is greater, the display is set to 1414 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 stopped. Stores the numeric value in the memory corresponding to that key. When the process of storing numerical values in the memory is executed, flag A is set to O'' in the first magnification setting mode, and flag B is set to O'' in the second magnification setting mode, and the process proceeds to step 5206.

Steps 8206 to 8208 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 too is displayed on the display device 72, 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.Therefore, the numerical value "BI" displayed thereby is "1"' as the standard setting value for the number of copies.

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 8406 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 lit as described above, and an arbitrary magnification is set, so step S402.5408.5415 and 54
At 20, 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 1.11. 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 Ill is turned on is determined, and if YES, in step 5502, one of the light emitting diodes 95a=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 (steps S522 and S523), the increase key 111 is pressed.
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, and 3520, 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 was set, it is assumed that the increment timer has finished counting in step 5522, and a YES determination is made, and the increment key is pressed. 111
It emits a signal similar to the rising edge of . Then, the process returns to step 5501 again. The above operation is repeated while the increase key 111 is turned on, and the 1g rate 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 5501
, 3508 and 5510, and if it is determined that the decrease key 112 is on, the process proceeds to step S5]1
Light emitting diodes 95a to 1 corresponding to the magnification key with a
03a is turned off, and in step 5511, an automatic decrement timer is set. Then, in step 5512, the magnification is decreased by 0.002 every time 5 seconds elapse.

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 memo IJQ1 to Q8, and the modified magnification can be used once or a series of copying operations are completed. After that, return to the original magnification.

Note that if the increase key 111 is turned on once for a short time,
The unit amount can increase the magnification by 002 areas.

Turning the decrease key 112 on only once for a short period of time will decrease the magnification by a unit amount.

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 be simply flashed every time the numerical value changes.

Also, increase key 111. If the a-uki-112 is kept on, the rate of change of the numerical value may be made faster in accordance with the time of operation.

This concludes the explanation of the setting operation in the one-tone rate 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 can be set at any time as necessary. While calling up the magnification and confirming the set magnification on the display, the numerical value can be used as control data for the first ear crosspiece. 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. This effect is achieved with great ease.

Further, by operating the increase key 11x and the g decrease key 112, the preset magnification value can be finely adjusted only at the time of copying, so that the desired magnification can be obtained very easily. 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 CPU 202 in accordance with the copying magnification, but the stamping motor M4 is For example, the drive is controlled in both forward and reverse directions so as to rotate by l pitch relative to the numerical value area 001 or 01002. Therefore, by operating the increase key 111 and decrease key 112, 0.002
The display may be associated with the smallest adjustable unit of the copying magnification by changing the magnification in increments. In addition, the second CPU 20 controls the moving speed of the optical system to be variable in accordance with the set numerical value.
The speed control of the direct current DC motor, which is the drive source, is controlled by the control device 205 based on the output of the drive source 2. Many methods have been proposed or provided in the past, 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 has a whiteboard that can be written on and erased with a prescribed writing instrument, a removable adhesive sticker, a spring le that can be attached and detached by magnetic force, etc. It would be convenient for use if the configuration was such that the user could write in the purpose of the numerical magnification arbitrarily set by the user, for example, characters such as "Paper paper → Δ4". The panel portion 70a may have a 1 m concave or convex level difference from the panel portion, if necessary.

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, by turning on the print switch, main motor ML 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 TA,
Start 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 clutch CL
3 is turned on, and a process of setting timer T-0 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. The transfer charger 14 is turned off, the copy flag is set to 0'', and the timer T-D is turned off.
Processing to set is executed.

In block 16, it is determined that the timer TD has ended, and the main motor M1 is turned off. Block 17 executes processing for various outputs.

Note that the timer T-A-T-D, etc. explained in the above flowcharts and time charts are incremented to "l" in one routine of the MC5Q process, which is executed within the time specified by the internal timer. This is a digital timer that is programmed into the timer, and the time-up time is stored as numerical data.

Effects As detailed above, in this invention, the copying magnification can be set by an extremely simple operation of selecting the stored magnification data, and it can be corrected in unit amounts, so it is convenient for the user to copy at any desired magnification at any time. This makes it possible and extremely convenient to operate. In addition, the error between the tentatively set copying magnification and the actual copying magnification can be corrected at the user level, making it possible to obtain accurate variable-magnification copies.

Furthermore, when the copy magnification is corrected using the increase/decrease means, the display means that displays the display corresponding to the fixed magnification selected at that time is turned off, so the operator can quickly and accurately confirm the set magnification. can.

[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 a magnification setting program, FIG. 12 is a flowchart showing details of a subroutine in the setting program of FIG. 11, FIG. 13 is a flowchart showing a specific magnification reading program, and FIG. 14 is an optional 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, 100~103・
...Selection key, 111...Increase key, 112...Decrease key〇

Claims (1)

[Claims] (1) An image forming means, a storage means capable of storing a plurality of numerical data, a selection means for selecting one of the numerical data stored in the storage means, and which numerical data is selected by the selection means. a selection display means for displaying whether a selection has been made; a magnification control means for setting the numerical data selected by the selection means as a copy magnification; a numerical display means; and a numerical value for increasing or decreasing the numerical value displayed on the numerical display means. an increase/decrease means, and the magnification control means sets the numerical value displayed on the numerical display means as a copy magnification and disables the display by the selection means when the numerical value increase/decrease means is activated. Features of the image forming device.