| 摘要 |
PURPOSE:To surely eliminate a light shielding paper and to surely set a photoreceptive drum. CONSTITUTION:When a new photoreceptive drum unit 1 is installed in a device main body, the filler 40a of a sensor 40 is positioned at a through-hole 23a formed on the grip 23 of the unit 1. When the light shielding paper 34 is left, the filler 40a abuts on the paper 34 covering the hole 23a and it is turned large. When the paper 34 is not left, the filler 40a abuts on the edge of the hole 23a and it is turned small. When the unit 1 is not installed in the device main body, the filler 40a is not turned. The existence of the paper 36 and the unit 1 is detected by the movement of the filler 40a. |
