JPS6051830A - Optical system driving controller - Google Patents

Abstract

PURPOSE:To speed up the backward movement of an optical system by providing a switch which is operated by the optical system in its backward movement and a means which switches a motor which drives said optical system from backward drive to forward drive by the operation of said switch. CONSTITUTION:The 1st carriage 2 is provided with a switching operating piece 6 for operating a home position switch 4 and a timing switch 5. The optical system is moved back by using the turning force of the motor at a maximum without speed control, and when the timing switch 5 installed in front of the home position is turned on by the operating piece 6, the current backward moving speed of the optical system is detected to determine a braking time T according to the detected speed and drives the motor forward for the time T, braking the backward movement. Consequently, the optical system is stopped accurately at the home position and the backward scan of the optical system is speeded up.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a drive control device for an optical system of a copying machine.

In particular, the present invention relates to a control device that controls a deceleration operation when an optical system is retracted.

[Prior art]

The optical scanning drive of a copying machine is operated from a single motor that drives the entire copying machine, including a paper I-channel, a photoreceptor ram drive, etc., via an optical forward clutch, a reverse clutch, and the like. Furthermore, in recent years, due to technological advances in DC motors and the demand for variable magnification copying modes, a system in which a DC motor is used exclusively for the optical scanning drive has been used.

FIG. 1 is a speed diagram of a conventional optical system drive control device when moving forward and backward.

In the figure, the vertical axis is centered on the 0 point, the upper side represents the forward speed, the lower side represents the backward speed, and the horizontal axis represents time.

Also, when the sequence is high, speed control is working in the forward direction, and when it is low, it shows that speed control is working in the backward direction.

In this optical system drive method using a DC motor, the forward drive is driven at a predetermined constant speed by the controller, and the backward drive is operated as fast as possible to increase the number of copies per unit time. In this case, it is difficult to stop the vehicle accurately at the home position, especially since the speed is increased during reverse drive J. For this reason, as a way to stop the robot reliably without causing a shock, the speed is controlled before it reaches the Baum position accurately, and a detector is installed at a position slightly before reaching the home position to keep the f & retreat scanning speed constant. This applies a certain amount of braking to f& clocking out work.

[Problems with conventional technology]

In the case of the conventional method, speed control is required even when the optical system is backward scanned, and the optical system cannot be moved backward by the motor rotation speed itself. Therefore, it takes time for the optical system to perform backward scanning, which has the drawback of limiting the number of copies.

In addition, when there are many types of variable magnification copying, the forward and backward speeds are 5
It is more than twice as wide. Therefore, forward and backward speed control is
It is technically difficult to execute with a single controller, and the conventional method has had the disadvantage of requiring a complicated control device such as installing a plurality of controllers.

[Purpose of the invention]

This invention has been made in view of the above-mentioned drawbacks of the present invention, and its purpose is to drive the optical system to perform backward scanning of the optical system as quickly as possible, and to stop the optical system precisely at the Baume position. The purpose of this invention is to provide a control device.

[Key points of the invention]

In order to achieve the above object, the present invention provides an optical system drive control device in which an optical system is driven forward and backward by an intermediate motor. The present invention is characterized by comprising means for switching the motor for driving the optical system from backward drive to forward drive, and means for varying the time period for applying forward drive force to the morph after the switching.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram of the optical system drive control device of the present invention included in a light source side moving type copying machine. In the figure, a first carriage 2 that moves together with a light d5 is installed at the lower left of the Haramatsu J stand l, and a second carriage that moves at a speed of % of the first carriage 2 is placed to the left of the first carriage 2. Install 3. Further, a switch operating piece 6 for switching the Bauhm position switch 4 and the timing switch 5 is installed on the first canalon 2. On the other hand, a document image is exposed on the drum 7, and a registration roller 8 is installed at the lower right of the drum 7.

FIG. 3 shows the forward and backward speeds of the optical system drive control device of the present invention. In the figure, the vertical axis is centered on the 0 point, the upper side shows the forward speed, the lower side shows the backward speed, and the horizontal axis shows time. Also, when the time chart is high, speed control works in the forward direction.
When it is 0-, it indicates that the speed control is in the reverse direction.

The optical system starts moving forward in response to the optical system advance signal, and the first
A timing switch/notch 5 is turned on by a switch operating piece 6 installed on the carriage 2.

By turning on the timing switch 5, the registration roller 8 is turned on.
starts rotating and feeds the paper waiting on the registration roller 8 one position. Further, the forward movement of the optical system is controlled at a constant speed to complete scanning of the original.

The speed of the optical system is controlled when the optical system moves backward by using the maximum rotational force of the motor. Detects the backward speed of the optical system, determines the braking time T according to that speed, applies forward drive to the motor for 1゛ time, brakes the backward movement, and stops the optical system accurately at the home position.・Kell.

FIG. 4 is a block diagram showing that the optical system detects the backward speed of the optical system when the timing switch 5 is turned on, determines the braking time 'r according to the detected speed, and brakes the motor. FIG. 5 is a flowchart of the 191 works.

In FIG. 4, the output of rotary encoder 9 is connected to the input of motor controller 10 and F/V converter 11, and the output of F/V converter 11 is connected to sample bold circuit 12.
Connect to the input of The output of the timing switch 5 is also input to the sample and hold circuit 12, and the output of the sample and hold circuit 12 is connected to the input of the A/D converter 13. The outputs of the A/D converter 13 and timing switch 5 are input to a microcomputer 14, and the output of the microcomputer 14 is input to a motor controller 10. The output of the motor controller 1o is connected to the input of the motor 15.

A method for determining the motor speed control time T shown in FIG. 4 will be explained according to the flowchart shown in FIG. The forward movement of the optical system is the same as that described above, and the output signal of the rotary encoder 9 is input to the motor controller 10 to control the forward movement of the optical system to a constant speed, and the command to end the forward movement (sl) is used to control the forward movement of the optical system. End forward movement.

The optical system moves backward in response to a command to reverse the motor (S2). The output signal of the rotary encoder 9 is input to the F/V converter 11, and the F/V converter 11 outputs a voltage value according to the output frequency of the rotary encoder 9. That is, the output frequency of the rotary encoder 9 synchronized with the rotation of the morph 15 ρ outputs a high frequency when the motor 15 rotates at high speed, and outputs a low frequency when the motor 15 rotates at low speed. F/V
The converter 11 outputs the output voltage value from the F/V converter 11 as a voltage value that changes every moment while the optical system is moving backward.

Here, the timing switch-on (S3) point before the home position is confirmed.

If this is yes, from timing switch 5.

An on signal is input to the sample hold circuit 12.

Timing switch 5 by sample hold circuit 12
The output voltage value of the A/F converter 11 when it is turned on is held (S4). The voltage value held in the sample bold circuit 12 is input to the A/D converter 13, which converts the input voltage value into digital data and inputs it to the microcomputer 14. The microcomputer 14 operates a timer according to the input digital data, and in response to the commands from the timer SF-1 to (S6), a signal to brake the rotation of the motor 15 is input to the motor controller 10, and the motor controller 10 starts the motor. Motor forward rotation to I5 (
The control in step S7) is added to start braking the rotation of the motor 15.

The microcomputer 14 determines the braking time T of the motor 15 when the digital data input from the A/D converter 13 is large.
A long comb, if the digital data input is small, motor 15
Shorten the braking time T, check the time-up (S8), and send the motor off (S9) signal to the motor controller 1.
0 to accurately stop the optical system at the home position.

Therefore, depending on the magnitude of the frequency of the rotary encoder 9, that is, the magnitude of the retraction speed of the optical system, the motor 15
The braking time T can be changed.

Note that the present invention is not limited to the above-mentioned case, and A/
It is also possible to use a microcomputer with a built-in D converter, or to use a high-speed A/D converter and remove the sampling bold circuit.

Further, the present invention can be applied not only to copying machines of the light source side movement type, but also to copying machines of the document table movement type.

〔Effect of the invention〕

As described above in detail, according to the present invention, the backward movement of the optical system can be stopped at the home position reliably in a short time. Furthermore, since the switching time for switching from backward drive to forward drive can be controlled when the optical system moves backward, it is possible to brake without difficulty even when the backward speed changes.

[Brief explanation of the drawing]

FIG. 1 is a speed diagram of a conventional optical system drive control device. FIG. 2 is a configuration diagram of an optical system drive control device of the present invention. FIG. 3 is a speed diagram of the optical system drive control device of the present invention. FIG. 4 is a block diagram of motor speed control, and FIG. 5 is a flowchart of motor speed control. ■...Document stand, 2...First carriage. 3...Second carriage, 4...Position position switch, 5...Timing switch, 6...
Switch actuation piece. 7...Drum, 8...Regis I. Laura. 9... Rotary encoder, 10... Motor controller, 11... F/V converter, 12...
Sample and hold circuit. 13...A/D converter, 14...Microcomputer, 15...Motor patent applicant Casio Computer Co., Ltd. Same as above ID Co., Ltd. Representative Patent Attorney Yoshiyuki Osuga Figure 1 Figure 2 Eye diagram 4

Claims (3)

[Claims] (1) In an optical system drive control device in which an optical system is driven forward and backward by an fD-1 motor, a switch is operated by the optical system when the optical system is retracted. 1? and means for switching the motor for driving the optical system from backward drive to forward drive by operating a switch. An optical system drive control device comprising means for varying the time period for applying forward driving force to the motor after the switching. (2) The optical system drive control device according to claim 1, characterized in that the variable means detects the backward speed of the optical system. (3) The optical system drive control device according to claim 1, wherein the switch is a timing switch for refeeding paper.