| 摘要 |
PURPOSE:To stabilize the relation of driving positions of respective parts and to prevent an image from color deviation by servo-driving any one of a scanning part, the 1st drum and the 2nd drum by a motor. CONSTITUTION:When a photosensitive drum 11 and a transfer drum 15 reaches a prescribed angle of rotation, a speed command data N1 is outputted and a value obtained by multiplying the command data N1 by a constant K is supplied to a preset counter 53. When a carry signal CY1 is outputted from the preset counter 53, a counting difference is generated in a controller 52 and a motor 50 is driven. When the motor 50 starts to be driven, a pulse P1 is outputted from a pulse encoder 51 and fed back to the controller 52. Since the controller 52 drives the motor 50 so that the difference between the pulse P1 and the signal CY1 is turned to '0', the motor 50 is driven following the output timing of the carry signal CY1. |
