| 摘要 |
PURPOSE:To reduce the capacity of an electric power source by controlling a driving motor for an optical scanning means synchronously while a motor contributing to copying is in operation, and driving said motor at the electric current below the intended value in the other prescribed period. CONSTITUTION:A photosensitive drum is rotated at a specified speed by a driving motor, and the speed thereof is detected by a speed detector 5 for the photosensitive drum. On the other hand, the number of revolutions of a motor 1 for driving an optical scanning means is controlled so as to keep the prescribed relation with the output of the detector 5 in accordance with said output. More specifically, the 1st switch 22 which changes the rotating direction of the motor 1, and the 2nd switch 26 which changes the speed of the motor in the stage of starting or inverting and in the stage of scanning cycle are provided. In the stage of starting or inverting the motor 1, the switch 26 is changed to the contact (a) side, by which the electric current of the motor 1 is controlled to a specified value. In the stage of scanning cycle, the switch 26 is connected to the contact (b) side, and the motor 1 is controlled according to the speed of the photosensitive drum. |
