METHOD OF AND APPARATUS FOR PREVENTING SCANNING LINE DEVIATION IN A PROCESS SCANNER OF A SEPARATED DRUM TYPE

摘要

An original drum (2) and a recording drum (9) are driven by synchronous motors (5, 12), respectively, and encoders (6, 13) output rotation timing pulses (Pa, Pb) at every rotation of the recording drum (9) and the original drum (2), respectively. If an interval of the timing pulses (Pa, Pb) becomes smaller than a prescribed value, a scanning line deviation control circuit (20) generates a motor control signal (Tb), thereby breaking electric power supply to the faster motor (5) for a prescribed period.