IMAGE FORMING APPARATUS

摘要

An image forming apparatus includes an optical detecting device; a movable unit including a rotatable member having a first light-blocking surface and a second light-blocking surface; and a control unit. The movable unit rotates with rotation of the rotatable member so that the second light-blocking surface is movable to a first position where the optical detecting device is light-blocked and a second position where the optical detecting device is not light-blocked, and includes a locking member for locking the second light-blocking surface in the second position. When the first and second light-blocking surfaces pass through a detecting portion of the optical detecting device, the control unit discriminates a state of the movable unit on the basis of a detection result of the optical detecting device.

主权项

1. A unit detachably mountable to an image forming apparatus including an optical detecting device, said unit comprising:
a rotatable member including a first light blocking portion configured to block light for the optical detecting device and a second light blocking portion having a light blocking range having a length different from that of a light blocking range of the first light blocking portion; and a contacting member contacting said second light blocking portion, wherein said second light blocking portion is retractable to a retracted position which is inside a peripheral surface of said rotatable member by contacting said contacting member with rotation of said rotatable member, and wherein said second light blocking portion is not detected by the optical detecting device when said second light blocking portion is in the retracted position.