PURPOSE: To eliminate the need for wiring a signal between an original rotating part and a copying machine body part by providing a means for detecting a rotation of an original drum for obtaining a signal for synchronizing in original feed and a copying operation on the copying machine body.

CONSTITUTION: In a copying machine body 1, when a rotation of an original drum 5 is detected by a magnetic sensor 9, a one-chip microcomputer 2 functioning as a control means for controlling a copying process controls a copying operation, and rotates a main motor 10. As a result, a photosensitive drum 11 rotates clockwise synchronously with the original drum 5, and also, a primary electrifier 16, and an original illuminating lamp 14 are energized. On the photosensitive drum 11 which has been electrified uniformly by the primary electrifier 16, a reflected image of an original on the original drum 5 illuminated by the original illuminating lamp 14 formed through a selfoc lens array 15 and a latent image is formed. When the photosensitive drum 11 rotates and passes through a developing cylinder 17, a toner is given to the latent image. By separating electrically the original rotating part and the copying machine body, troublesomeness for wiring is eliminated.