JPH0377507B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical system control device for a copying machine that allows copies to be made in accordance with a set reduction ratio.

Conventional optical system control devices for copying machines, for example, transmit motor driving force to the optical system (including mirrors, lenses, etc.) through mechanical means such as cams, links, etc. when the operator selects the reduction ratio. ,
There is one in which the optical system is moved to an optical position according to the magnification.

However, with conventional optical system control devices for copying machines, the driving force of a single motor is transmitted to mirrors, lenses, etc. of the optical system through mechanical means such as cams and links. The mechanical accuracy of the mechanical means determines the positional accuracy of the optical system;
Due to limitations in mechanical accuracy, there are limits to improving the positional accuracy of the optical system. In particular, in small copy machines where the focal length of the lens is short, the influence based on mechanical precision becomes relatively large, so the precision of magnification copying decreases and it cannot be used for copying official maps etc. that require precision. Sometimes.

The present invention has been made in view of the above,
To provide an optical system control device for a copying machine that can finely adjust the optical position of an optical system according to a set magnification factor in order to make copies that accurately correspond to a set magnification factor.

The optical system control device for a copying machine according to the present invention will be explained in detail below.

FIG. 1 shows an embodiment of the present invention, which includes a document table 1 on which an original is placed and moved, a fixed lamp 2 that scans the moving original, a mirror 3 that guides scanning light,
4, 5 and a lens 6, a photosensitive drum 7 that is exposed to scanning light and then undergoes each process of development, transfer, and cleaning, and a motor that drives the mirror 4 via a drive belt 8 (for example, Stepping motor that rotates by an angle corresponding to the number of pulses) 9
and actuator 1 that moves together with mirror 4.
0 and detects that the mirror 4 is at a predetermined reference position (this sensor position is the first reference position), the lens 6 is driven via the drive belt 12 A second motor (for example, a stepping motor that rotates by an angle corresponding to the number of pulses when input) contacts the actuator 14 that moves together with the lens 6 to detect that the lens 6 is at a predetermined reference position. sensor 15 (this sensor position is taken as the second reference position), the first and second sensors 11,
A microcomputer 17 that inputs various signals from the console 15 or the console 16 and outputs signals for controlling each part of the copying machine, a drive motor 18 that drives the document table 1 based on the output of the microcomputer 17, and the microcomputer 16.
It has drive circuits 19 and 20 that control the drive of the motors 9 and 13 based on the outputs of the motors 9 and 13. console 16
As shown in FIG. 2, in addition to other operation keys (e.g., numeric keypad, start key, etc.) not shown, the display unit 21, reduction ratio key 22, and fine adjustment dial 23 (adjustment values 1 to 16) has),
The microcomputer 17 also controls the first and second sensors 11,
an input interface 17 having ports I ₁ and I ₂ for inputting signals of 15 and ports I ₃ and I ₄ for inputting signals of the reduction ratio key 22 and fine adjustment dial 23;
a (other input ports are not shown) and microcomputer 1
ROM containing the programs necessary for signal processing of 7.
17b and perform signal processing based on the program.
CPU17e and RAM that stores necessary data etc.
17d, the number of pulses corresponding to the dial value of the fine adjustment dial 23 is added to the reference pulse number predetermined according to the reduction ratio signal of the reduction ratio key 22, and the motors 9, 13 are activated by the number of clock pulses corresponding to the added value. A preset counter 17e (sequentially subtracted by clock pulses) presets the added value for driving, and the motor 9,
Ports O ₃ and O ₄ output drive signals to drive circuits 19 and 20 to drive motor 13, ports O ₁ and O ₂ output drive direction signals (forward rotation, reverse rotation), motor 1
an output interface 1 comprising a port O ₅ for outputting a drive signal for driving the 8 and a port O ₆ for outputting a display signal to the display section 21 of the console 16;
7f (other input ports are not shown).

In the above configuration, if the first and second sensors 11 and 15 do not output sensor signals after the copying machine is turned on and the power-on reset is performed (the mirror 4 and the lens 6 are at the first and second reference positions) _{When the mirror 4}
and return the lens 6 to the standard position. As a result, when the sensors 11 and 15 output sensor signals, the output of both signals from the microcomputer 17 is stopped. Next, when a reduction ratio signal is output by operating the reduction ratio key 22, a reference pulse number corresponding to the reduction ratio is calculated by program processing of the CPU 17e and stored in the RAM 17d. Incidentally, the number of reference pulses corresponding to each reduction ratio is as follows.

Reduction ratio Reference pulse number 70% 62 81% 192 86% 242 96% 342 100% 402 122% 662 141% 872 At the same time, when the operator operates the fine adjustment dial 23, a fine adjustment signal is output, and the fine adjustment signal is output by the program processing of the CPU 17e. Then, the number of pulses corresponding to the dial value is stored in the RAM 17d. If the operator's selection of the reduction ratio is 100% and the dial setting value is 8 (median value from 1 to 16), the next calculation will be performed by the CPU.
17, and the calculated value is preset in the preset counter 17e.

402 (reference pulse) + 8 (dial value) = 410 The preset calculation value 410 is subtracted every time the clock pulse is output, and the drive signal "" is sent from the output ports O ₂ and O ₄ of the output interface 17f until the calculation value becomes zero. Normal rotation signal "1" is output from output ports O ₁ and O ₃ . By outputting these two signals, the drive circuits 19 and 20 output drive pulses synchronized with the clock pulses to drive the stepping motor 1.
1 and 13 in the normal direction, and move the mirror 4 and lens 16 from the first and second reference positions to positions corresponding to the magnification of 100% (when the movement is completed, the preset value of the preset counter 17e is zero). be). As mentioned above, the fine adjustment dial value can be selected within the range of, for example, 1 to 16, so after the optical system is assembled, there is no need to reassemble it and the accuracy of the set magnification is not reduced. It can be copied, and if the optimum value of the fine adjustment dial value for each reduction ratio is stored in the RAM 17d, there is no need to operate the fine adjustment dial 23 each time (for example, via the numeric keypad). .

FIG. 3 shows the operations described above in the form of a flowchart.

In the above embodiment, after adding the reference pulse number and the dial value, the optical system is moved based on the added value. After the movement, fine adjustment may be made based on pulses corresponding to the dial value.

As explained above, according to the optical system control device for a copying machine according to the present invention, the optical position of the optical system can be finely adjusted according to the magnification ratio, so that copies can be made accurately according to the set magnification ratio. be able to.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. Second
The figure is a perspective view showing one embodiment of the present invention. FIG. 3 is a flowchart showing the operation of the present invention. 1...Original table, 2...Fixed lamp, 3, 4, 5
... Mirror, 6 ... Lens, 7 ... Photosensitive drum, 8, 12 ... Drive belt, 9, 13 ... Stepping motor, 10, 14 ... Actuator, 11, 15 ... Sensor, 16 ... Console, 17...Microcomputer, 18...Document plate drive motor, 19, 20...Drive circuit, 21...Display section,
22...Reduction ratio key, 23...Fine adjustment dial.

Claims (1)

[Scope of Claims] 1. A copying machine equipped with a control section that moves lenses and mirrors to positions according to a selected magnification factor via a drive pulse motor, wherein the magnification factor is input from outside the copying machine. input means for inputting a fine adjustment amount of the lens and mirror positions from outside the copying machine; and input means for inputting a fine adjustment amount of the lens and mirror positions from outside the copying machine; a calculation means for calculating the number of pulses corresponding to the fine adjustment amount inputted from the amount input means; a preset counter for inputting the result calculated by the calculation means; and a preset counter for inputting the result calculated by the calculation means; and driving means for driving the drive pulse motor.