JP2500800B2 - Optical system controller for copiers - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system control device for a copying machine, which is capable of making a copy appropriately corresponding to a set reduction ratio.

[0002]

2. Description of the Related Art As a conventional optical system controller for a copying machine,
For example, when the operator selects a reduction ratio, the motor driving force is transmitted to an optical system (including a mirror, a lens, etc.) through a mechanical means including a cam, a link, etc., and the optical system is adjusted to the reduction ratio. Some are designed to be moved to the optical position.

However, according to the conventional optical system control device for a copying machine, the driving force of a single motor is transmitted to the mirrors, lenses, etc. of the optical system through mechanical means such as cams and links. Therefore, the positional accuracy of the optical system is determined based on the mechanical accuracy of the mechanical means, and therefore, the improvement of the positional accuracy of the optical system is restricted due to the restriction of the mechanical accuracy. In particular, in a small-sized copying machine where the focal length of the lens becomes short, the influence based on mechanical precision becomes relatively large, and the precision of magnification copying decreases, and it cannot be used for copying such as public figures requiring precision. Sometimes.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and in order to make a copy that properly corresponds to the set reduction ratio, the optical system of the optical system according to the reduction ratio is provided. The present invention provides an optical system control device for a copying machine, the position of which can be finely adjusted.

Furthermore, the present invention provides an optical system control device for a copying machine which does not require fine adjustment of the reduction ratio each time the reduction ratio is changed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The optical system control device for a copying machine according to the present invention will be described in detail below.

FIG. 1 shows an embodiment of the present invention. A copying machine to which the optical system control device for a copying machine according to the present invention is applied,
A document table 1 on which a document is placed and moves, a fixed lamp 2 for scanning the moving document, and a mirror 3 for guiding scanning light.
4, 5 and the lens 6, the photoconductor drum 7 that is exposed by scanning light, and then undergoes the processes of development and cleaning, and the mirror 4 via the drive belt 8 and a drive motor (for example, according to the number of input pulses). A first sensor 11 (contacts the stepping motor that rotates by an angle) 9 and an actuator 10 that moves together with the mirror 4 to detect that the mirror 4 is at a predetermined reference position (this sensor position is the first reference position). Position) and the lens 6 to the drive belt 12
A motor (for example, a stepping motor that rotates by an angle according to the number of input pulses) 13 driven via
A second sensor 15 that detects that the lens 6 is at a predetermined reference position by making contact with the actuator 14 that moves together with the lens 6 (this sensor position is the second reference position); A microcomputer 17 that inputs various signals from the sensors 11 and 15 or the console 16 of FIG. 2 and outputs signals that control each part of the copying machine, and a drive motor 1 that drives the document table 1 based on the output of the microcomputer 17.
8 and drive circuits 19 and 20 for controlling the drive of the motors 9 and 13 based on the output of the microcomputer 16.

As shown in FIG. 2, the console 16 includes a display unit 21, a reduction ratio key 22 and a fine adjustment dial 23 (1 to 16) in addition to other operation keys (not shown) (for example, a numeric keypad, a start key, etc.). Of the first and second sensors 11, 1
Ports I ₁ and I ₂ for inputting signal 5 and reduction ratio key 2
2. Port I ₃ for inputting the signal of the fine adjustment dial 23,
An input interface 17a having I ₄ (other input ports are not shown), a ROM 17b having a program necessary for signal processing of the microcomputer 17, a CPU 17c performing signal processing based on the program, necessary data and the like are stored. 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 RAM 17d and the reduction ratio key 22, and the motors 9 and 13 are the number of clock pulses corresponding to the added value. A preset counter 17e (which is sequentially subtracted by a clock pulse) for driving the motors 9 and 13 to drive the motors 9 and 13 until the added value becomes zero.
Ports O ₂ and O ₄ that output drive signals to 0, ports O ₁ and O ₃ that output drive direction signals (forward rotation, reverse rotation), motor 18
Port O ₅ for outputting a drive signal for driving the display device, and port O ₅ for outputting a display signal to the display unit 21 of the console 16.
_It has an output interface 17f with ₄ (other input ports not shown).

In the above structure, the first and second sensors 1 are turned on after the power of the copying machine is turned on and the power-on reset is performed.
When 1 and 15 do not output the sensor signal (when the mirror 4 and the lens 6 are not at the first and reference positions), the reverse signal from the microcomputer 17 (“0” from the output ports O ₁ and O ₃ )
And a drive signal (“1” from the output ports O ₂ and O ₄ ) are output to return the mirror 4 and the lens 6 to the reference position. As a result, when the sensors 11 and 15 output the sensor signals, the output of both signals from the microcomputer 17 is stopped. Next, when the reduction ratio signal is output by operating the reduction ratio key 22, the number of reference pulses corresponding to the reduction ratio is calculated by the program processing of the CPU 17c and stored in the RAM 17d. Incidentally, the number of reference pulses corresponding to each reduction ratio is as follows.

[0010]

[Table 1]

At the same time, the operator makes a fine adjustment dial 23.
When is operated, a fine adjustment signal is output, and the number of pulses corresponding to the dial value is R by the program processing of the CPU 17c.
It is stored in the AM 17d. If the operator selects 100% reduction ratio and the dial setting value is 8 (median value of 1 to 16), the CPU 17 performs the following calculation,
The calculated value is preset in the preset counter 17e.

[0012]

[Equation 1] 402 (reference pulse) + 8 (dial value) = 410

[0013] preset calculation value 410 is subtracted for each output clock pulse, the drive signal from the output port O _2, O ₄ of the output interface 17f to the calculated value becomes zero is "1", the output port O _1, A normal signal “1” is output from O ₃ . The drive circuits 19 and 2 are output by the output of both signals.
0 outputs a drive pulse synchronized with the clock pulse to rotate the stepping motors 9 and 13 in the forward direction, and
Mirror 4 from the reference position to the position corresponding to 100% reduction ratio
And the lens 16 is moved (when the movement is completed, the preset value of the preset counter 17e is zero).

As described above, since the fine adjustment dial value can be selected in the range of 1 to 16, for example, the precision of the set magnification is lowered without reassembling after the optical system is assembled. It is possible to copy without doing this, and since the optimum value of the fine adjustment dial value for each reduction ratio is stored in the RAM 17d (for example,
The fine adjustment dial 23 does not have to be operated each time (via the numeric keypad).

FIG. 3 is a flowchart showing the operation described above. In the above embodiment, after the reference pulse number and the dial value are added, the optical system is moved based on the added value. However, based on the reference pulse predetermined according to the selected reduction ratio, After the movement, fine adjustment may be performed based on the pulse corresponding to the dial value.

[0016]

As described above, according to the optical system control device for a copying machine of the present invention, since the optical position of the optical system can be finely adjusted according to the reduction ratio, the reduction ratio can be set appropriately. You can make a suitable copy.

Further, according to the optical system control device for a copying machine of the present invention, the number of fine adjustment pulses for each reduction ratio is read and the preset value is set in the preset counter using the number of fine adjustment pulses for each reduction ratio. Since the input is input, it is possible to obtain an optical system control device for a copying machine which does not require fine adjustment of the reduction ratio each time the reduction ratio is changed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing an embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the present invention.

[Explanation of symbols]

1 original table, 2 fixed lamps, 3, 4, 5 mirrors, 6 lenses, 7 photosensitive drums, 8, 12 drive belts, 9, 13 stepping motors 10, 1
4 actuators, 11, 15 sensors, 16
Console, 17 microcomputer, 18 platen drive motor, 19, 20 drive circuit, 21 display section, 22
Reduction ratio key, 23 fine adjustment dial.

Claims (1)

(57) [Claims] 1. A copying machine comprising a control unit for moving an optical system such as a lens and a mirror via a drive pulse motor to a position corresponding to a selected reduction ratio, wherein a plurality of copying machines are provided from the outside of the copying machine. An input unit for selectively inputting a preset reduction ratio, and a fine adjustment amount input unit for inputting a fine adjustment amount of the position of the optical system for each of a plurality of preset reduction ratios from the outside of the copying machine. A reference pulse number holding means for holding a reference pulse number according to each preset reduction ratio, and a computing means for outputting a fine adjustment pulse number according to the fine adjustment amount input from the fine adjustment amount input means. A preset counter for inputting the reference pulse number or the fine adjustment pulse number as a preset value, and the reference pulse number read out from the reference pulse number holding means according to each reduction ratio input from the input means, Drive means for alternately inputting the number of fine adjustment pulses output by the arithmetic means to the preset counters to move the optical system by the drive pulse motors based on the preset value of each preset counter; and the fine adjustment amount. Storage means for storing the number of fine adjustment pulses finely adjusted by the input means for each preset reduction ratio; and the storage means when the fine adjustment amount input means does not finely adjust the position of the optical system. And a control means for reading the number of fine adjustment pulses for each reduction ratio stored in the means and for inputting a preset value to the preset counter using the number of fine adjustment pulses for each reduction ratio. Optical system controller for copiers.