| 摘要 |
PURPOSE:To clean a cleaning blade by charging electrostatically a photosensitive drum to form an electrostatic charging part, and passing the tip of the cleaning blade through said part while an exposing means, transfer means and separating means are not operated. CONSTITUTION:A photosensitive drum 1 is rotated at a speed of 150mm./sec in an arrow direction and a pulse voltage of 0.1sec is impressed on an electrostatic charger 2 to form an electrostatic charging part 13 of 15mm. length in the circumferential direction on the drum surface. A cleaning blade 7 shifts from the state detached from the drum into the state in press contact therewith upon starting of rotation of the drum 1. An exposing means 3, developing means 4, transfer means 5 and separating means 6 are not operated until the part 13 is passed through the means 3-6 by the rotation of the drum. A destaticizing lamp 9 provided underneath the blade 7 is not operated as well. When the part 13 arrives at a blade 8, the toner 10 sticking on the rear 8a of the blade is attracted by the part 13 and the blade is thus cleaned. The formation of a black line on the 1st sheet of the transfer paper is thus prevented. |
