JPH0810384B2 - Magnification control device for copiers - Google Patents

Description

The present invention relates to a magnification control device for a copying machine having a variable magnification function.

(B) Conventional Technology In the conventional magnification control device of this type, the magnification is set, and the scaling means (lens or mirror) is driven after the copy start key is pressed, or the scaling means is operated at the same time as the setting. You can see what drives.

(C) Problems to be Solved by the Invention However, in the case of driving the scaling means after the copy start key is pressed, it takes time to start the copying operation, and the scaling is performed simultaneously with the setting. If the magnification setting value is changed during driving, the means for driving the means must stop the driving of the scaling means abruptly and re-drive the scaling means in the opposite direction in accordance with the changed setting value. However, since the driving means is suddenly overloaded, there is a problem in that the driving means may malfunction or the life of the driving means may be shortened.

The present invention has been made in consideration of such circumstances, and provides a magnification control device that does not cause unnecessary movement or sudden reverse movement of the magnification varying means even when the magnification setting value is changed. It is a thing.

(D) Means for Solving the Problems FIG. 1 is a block diagram showing the configuration of the present invention.
Reference numeral 1 is a fixed magnification setting means for selecting a fixed magnification with the equal magnification key 102 and fixed magnification key 103, 104 is a time counting means for outputting a setting signal from the fixed magnification setting means 101 after a predetermined time after the fixed magnification is set, 105 Is an arbitrary magnification setting means for arbitrarily setting the magnification with the magnification up key 106 or the magnification down key 107, 108 is a display means for displaying the magnification set by the fixed magnification setting means 101 and the arbitrary magnification setting means 105, and 110 is a fixed magnification. It is a driving means for driving the scaling means 111 by the output of the setting means 101 or the arbitrary magnification setting means 105 to change the magnification. When the magnification is set in the arbitrary magnification setting means 105, the timing operation of the timing means 104 is reset. At the same time, the set magnification is displayed on the display means 108 by the output of the arbitrary magnification setting means 105, and the driving means 110 drives the scaling means 111 according to the set magnification.

(E) Action When the fixed magnification is set in the fixed magnification setting means 101 by the equal magnification key 102 and the fixed magnification change key 103, the magnification is displayed on the display means 108, but within a predetermined time measured by the time counting means 104. Drive unit 110 does not drive scaling unit 111. Therefore, if the magnification up key 106 or the magnification down key 107 is operated within this predetermined time, the timing operation of the timing means 104 is reset and the set magnification is displayed on the display means 108 by the output of the arbitrary magnification setting means 105. Then, the driving unit 110 is driven to control the magnification of the scaling unit 111. in this way,
Even if the fixed magnification is set, the fixed magnification and the arbitrary magnification can be reset within a predetermined time without driving the driving unit 110.

(F) Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. The present invention is not limited to this.

FIG. 2 (a) is a block diagram showing an embodiment of the present invention, FIG. 2 (b) is a front view showing the operation panel of FIG. 2 (a), and 1 is a magnification of 100% (actual magnification). 100% key to set, 2 is a fixed scaling key that sequentially selects 5 fixed magnifications of 70%, 82%, 87%, 115%, 141%, 3 and 4 are magnification ratios between 64 and 141%. Up key and down key that can be set arbitrarily, 5 is CPU,
Microcomputers (hereinafter referred to as microcomputers) 6 and 7 with built-in ROM and RAM are input / output I / O ports of the microcomputer 5, 8
Is a stepping motor for moving the zooming means, that is, the lens 9a and the mirror 9b (the mirror 9b is mechanically interlocked with the lens 9a), 10 is a display for displaying the magnification set by the fixed zoom key 2, and 11 is 100 A display that can display the magnification set by the% key 1, fixed variable magnification key 2, up key 3, or down key 4 in 1% increments by 1%. 12 indicates that the lens 9a is at the home position (of the lens 9a). This is the position that serves as a reference for position calculation, and is a switch that is output when it reaches a movement range corresponding to a magnification of 64% to 141%).

When the zooming means is a zoom lens, it is not necessary to move only the lens and the mirror.

The operation of FIG. 2 will be described with reference to the flowcharts of FIGS. 3 (a) to 3 (d). To explain the terms used in this flow chart, timer 1: 100% timer that drives the stepping motor 8 750 msec after pressing the key 1 or pressing and releasing the fixed scaling key 2, timer 2: fixed variable. 750mse if you keep pressing the double key 2
A timer that changes the magnification display for each c. Timer 3: A timer that works the same as timer 2 when pressing up key 3 or down key 4 (however, if you press and hold up key 3 or down key 4 for 1 second or more, (The display is changed every 100 msec), Timer 4: A timer provided to eliminate the chattering period of the switch when recognizing whether the home position switch 12 is on or off, and the home position switch 12 is turned on. After that, every time the timer 4 counts up, it is confirmed whether the home position switch 12 is turned off.

100% key ON flag: A flag for performing the processing only once when the 100% key 1 is pressed. Movement enable flag: When this flag is set, movement of the lens 9a shown in FIG. 3 (d) As in the routine, when the stepping motor 8 moves the lens 9a by the calculated number of steps and the lens 9a moves by the calculated number of steps, this flag is cleared.

Home position passage flag: A flag for moving the lens 9a by a predetermined number of steps after passing the home position when the lens 9a moves toward each home position.

First, if the 100% key 1 is not turned on in step 201, the 100% key ON flag is cleared (step 202) and the fixed scaling key is not turned on (step 20).
3) The timer 2 is cleared (step 204). When the up or down keys 3 and 4 are not turned on (step 205), the timer 3 is neither counting nor counting up (step 206), and when the timer 1 is not counting up (step 207), the operation routine is stepped again. Return to 201.

In step 201, if 100% key 1 is turned on, timer 2 and timer 3 are cleared (step 20
8), 100% key ON flag is not turned on (step 20
9) Furthermore, when 100% is not displayed on the display unit 11 (step 210), 100% is displayed on the display unit 11, the 100% key ON flag is set, and the timer 1 is set to 750ms.
It is set to ec, the movement enable flag is cleared (step 211), and the routine proceeds to step 207.

When the fixed variable magnification key 2 is turned on in step 203, the timer 3 is cleared, the timer 1 is set to 750 msec, and the movement enable flag is cleared (step 212). If the timer 2 is not counting (step 213), the timer 2 is set to 750 msec (step 214), the magnification display of the display 11 is changed (step 215), and the operation routine proceeds to step 201. Return.

If the up or down keys 3 and 4 are turned on in step 205, the timer 1 is cleared (step 21
6) When the timer 3 is not counting (step 217) and the timer 3 is not counting up (step 218), 1 sec is set in the timer 3 (step 219) and the magnification display of the display 11 is changed. (Step 220). When the 1% digit of the magnification display indicates 2 or 7 (step 221), the timer 1 is cleared (step 222),
The number of steps of the stepping motor 8 for moving the lens 9a is calculated (step 223), and when the magnification display is not 100% (step 224), the home position passage flag is cleared (step 225) and the movement enable flag is set. After that (step 226), the operation routine returns to step 201. If the timer 3 is counting in step 217, the operation routine returns to step 201. Further, when the timer 3 counts up in step 218, 100 msec is set in the timer 3 (step 227). Also, in step 221,
If the 1% digit of the magnification display is not 2 or 7, the operation routine returns to step 201. In step 224, if the magnification display is 100%, the home position passage flag is set (step 228). If the timer 3 is counting or counting up in step 206, the timer 3 is cleared (step 229) and the operation routine proceeds to step 222. If the 100% key ON flag is on in step 209, the operation routine proceeds to step 207. Furthermore, if 100% is displayed in step 210, the operation routine returns to step 201, and if the timer 2 is counting in step 213, the operation routine also returns to step 201.

When the power of this control device is turned on, the display 11 is set to display 100% (step 23
0), the operation routine proceeds to step 223.

FIG. 3 (d) shows an operation routine of the lens 9a, which is processed at regular intervals by a timer interrupt or the like.

In step 301 of the figure, if the movement enable flag is on, the home position passage flag is determined (step 302), and if it is not on, the number of steps calculated in step 223 (FIG. 3 (c)). Is compared with the movement count number of the lens 9a (the integrated value of the steps in which the lens 9a has moved from the home position) (step 303). If the calculated step number is larger, the stepping motor 8 advances the lens 9a by one step. Then, the movement count number is incremented by 1 (step 304), and 1 is added (step 305). If the number of calculation steps is smaller (steps 303 and 306), the lens 9a moves back one step (step 307), and the movement count number is decremented by 1 (step 308). Furthermore, when the number of calculation steps and the movement count number match (steps 303 and 306), the movement enable flag is cleared (step 309).
When the home position passage flag is turned on in step 302, the timer 4 is counted up (step 310) and the home position switch 12
Is turned off (step 311), the home position passage flag is cleared, the movement count number is cleared, and the timer 4 is cleared (steps 312, 313, 314). When the home position switch 12 is not turned off in step 311, the lens 9a moves forward by one step (step 315) and the timer 4 is set to 125 msec (step 316). If the timer 4 does not count up or is not counting in step 310 (step 317) and the home position switch 12 is not on (switch 318), the lens 9a moves backward by one step (step 319). . If the timer 4 is counting in step 317, the operation routine returns to the control main routine of the copying machine (not shown). If the home position switch 12 is turned on in step 318, the operation routine proceeds to step 315.

In this way, 100% key 1 and fixed scaling key 2
Even if the magnification is set by
9a does not move, and when the magnification is set by the up key 3 or the down key 4, the lens 9a moves correspondingly and the timer 1 is cleared. Therefore, even if the magnification is reset, the lens 9a moves. Is done smoothly.

(G) Effect of the Invention According to the present invention, even if the setting value is changed immediately after setting the fixed magnification, the optical system driving mechanism is locked for a predetermined short time, so that the sudden reverse movement of the lens, mirror, etc. It is possible to smoothly and efficiently move the optical system to the set value without advancing or overloading the motor, and the durability of the device is improved. Further, when the fixed magnification setting and the arbitrary magnification setting are used together, the locking operation is automatically released, so that the desired arbitrary magnification setting can be quickly executed and the operability and durability of the copying apparatus can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIGS. 3a to 3d are flow charts showing the operation of FIG. 1 …… 100% key, 2 …… Fixed scaling key, 3 …… Up key, 4 …… Down key, 5 …… Microcomputer, 6,7 …… I / O port, 8 …… Stepping motor, 9a
…… Lens, 9b …… Mirror, 10,11 …… Display, 12 ……
Home position switch.

Claims (1)

[Claims] 1. A control unit for a scaling means for forming a document image on a photosensitive member by changing the magnification, wherein fixed magnification setting means for selecting a fixed magnification by an equal magnification key and a fixed magnification key, and fixed magnification Time setting means for outputting a setting signal from the fixed magnification setting after a predetermined time after setting, arbitrary magnification setting means for arbitrarily setting the magnification with a magnification up key or a magnification down key, the fixed magnification setting means and the arbitrary magnification The display device displays a magnification set by the setting means, and a driving means for driving the scaling means by the output of the fixed magnification setting means or the arbitrary magnification setting means to change the magnification. When a magnification is set in the arbitrary magnification setting means during operation, the timing operation of the time measuring means is reset and the output of the arbitrary magnification setting means is set. Ri set magnification is displayed on the display means, the driving means is the magnification control device for a copying machine, characterized by driving said zooming means in accordance with the set magnification.