| 摘要 |
PURPOSE:To save developer and to reduce power consumption by providing a potential application means that applies potential to a photosensitive body during a non-image period. CONSTITUTION:A drum bias is applied to the photosensitive drum 1 from a constant voltage transformer 9. In this case, the potential of the drum is controlled by the constant voltage transformer 9. That is, at the end of printing, the main charger 4 is first turned off, and at the same time that the rotation of the drum 1 reaches a development section A, a constant voltage transformer 6 is turned off, and the application of a development bias to a development roller 2 is stopped. Also, at the same time, the constant voltage transformer 9 is turned on, and a drum bias is applied to the photosensitive drum 1. This application continues until the main motor is turned off, that is, until the rotation of the photosensitive drum 1 stops. Thus, during the non-image period in which electrification is not carried out, the potential having the same polarity as that of developer is applied to the photosensitive body, the area where the development means acts on it. |
