Controlling rotation of a rotating drum in an imaging device for printing plates

摘要

As a rotational reference position (40) of a rotating drum (16) is detected by a rotational position detection sensor (42) for each rotation of the rotating drum, a rotational position of the rotating drum at a time of detection can be known. Subsequent to a signal for instructing stop of the rotating drum being input, the rotational reference position is detected. Then, a stop position calculation processing section (56) calculates a stop control pulse for stopping the rotating drum from the rotational position at a trailing edge chuck (36) detaching position. Thus, the rotating drum is reliably stopped at the trailing edge chuck detaching position. A stop processing is performed by a rotating drum drive control section (58) when the rotational reference position is detected after the calculation. As a result, the stop position is not shifted by the time required for calculation and generation of the stop control pulse.