| 摘要 |
PURPOSE:To allow a pressing member such as a cleaning member and a pressed member such as a photoreceptor to contact and leave each other with constant contacting pressure without any damage by permitting both members to contact and leave each other by a cam member through a spring member. CONSTITUTION:An output shaft 16 in a noncleaning state is rotated by a specified extent to turn a lever 11 by an eccentric cam 17. Consequently, the lever 11 elevates one end 14 of a roll arm 12 through the spring member 15. Therefore, the roll arm 12 turns around a fulcrum 10 until a cleaning roll 1 supported at the other end of the arm 12 abuts on the photoreceptor 3. Since the eccentric cam 17 further rotates even after the roll arm 12 stops, the eccentric cam 17 and roll arm 12 leave each other and the spring member 15 expands to press the cleaning roll 1 against the photoreceptor 3 with constant pressure. Thus, the pressing member and pressed member are permitted to contact and leave each other with the specified pressure without being damaged. |
