| 摘要 |
PURPOSE:To prevent carriers from floating and toner from adhereing to a photosensitive body by controlling a power source by a voltage control means based on a voltage control timing detected by a detecting means after picture forming operations are completed. CONSTITUTION:After the potential of the photosensitive body 1 is uniformly electrified at a prescribed High level by a main electrifier 2, the photosensitive body 1 is reversely electrified by a transfer electrifier 6 and its surface potential becomes Low. Then, after the surface potential of the photosensitive body 1 is electrified to be such a potential that the carriers do not float, the developing bias of the developing device 4 is turned off. After the developing bias is turned off, the operation of the exposure device 16 is controlled by an exposure device control means 14 based on the timing of operating the exposure device 16, which timing is detected by the detecting means 15, and the surface potential of the photosensitive body 1 is lowered to near a ground potential by light emitted from the exposure device 16. Thus, the carriers floating and the toner adhereing to the photosensitive body can be prevented. |
