| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deterioration of an image by making pressing force between a developing roller and a processing member coming in contact with the developing roller zero with simple constitution. SOLUTION: The developing roller 24 is supported so that it can contact with/separate from a photoreceptor drum 12, and a developing blade 30 is supported so that is can contact with/separate from the roller 24. When image forming operation is started, a developing device 22 (driven member 34) is pressed to a turning cam 32 and displaced in a specified direction. Namely, the blade 30 is pressed to the roller 24 and the roller 24 is pressed to the drum 12. When the image forming operation is finished, the cam 32 is turned again and the developing device 22 is displaced in a direction where it is separated from the drum 12, whereby the pressing of the blade 30 to the roller 24 and the pressing of the roller 24 to the drum 12 are released. |
