Image forming apparatus

Details Image forming apparatus Image forming apparatus

1988-11-15

1990-09-04

Hix, L. T.

Photocopying

Projection printing and copying cameras

Original moves continuously

355 56, 355235, G03B 2734

Patent

active

049548638

ABSTRACT:
An image forming apparatus includes a movable optical system for reading an original image, a motor for driving the optical system, a motor driving circuit, an encoder which outputs signals responsive to velocities of the motor, a control circut which controls the motor driving circuit such that the optical system starts from a home position and turns at a predetermined point to return again to the home position, and applies braking to the motor when the optical system is stopped at the home position, and a microcomputer for deciding timing to apply braking in response to an output of the encoder. By deciding brake timing in response to the output of the encoder, the optical system can be stopped accurately at the home position even when a moving load is abnormally increased due to stains on component members forming a running path for the optical system, or due to replacement of the optical system.

REFERENCES:
patent: 4561774 (1985-12-01), Takahashi et al.
patent: 4568171 (1986-02-01), Ikenoue
patent: 4693595 (1987-09-01), Kunikawa et al.
patent: 4731657 (1988-03-01), Miyagi

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