IMAGE FORMING APPARATUS

摘要

An image forming apparatus includes a movable image-bearing member, a sensor opposed to the image-bearing member, a shutter member arranged between the image-bearing member and the sensor and capable of moving between an open position and a closed position, a rotatable cam configured to move the shutter member, and an execution portion configured to selectively execute a first mode in which the shutter member is opened or closed by rotating the cam within a first phase range and a second mode in which the shutter member is vibrated by rotating the cam at least through a second phase range different from the first phase range.

主权项

1. An image forming apparatus comprising:
a movable image-bearing member configured to bear a toner image; a sensor opposed to the image-bearing member; a shutter member arranged between the sensor and the image-bearing member and movable between an open position at which the sensor is exposed to the image-bearing member and a closed position at which the sensor is shielded from the image-bearing member; a rotatable cam configured to move the shutter member; and an execution portion capable of selectively executing a first mode in which the cam is rotated within a first phase range and the shutter member is opened or closed and a second mode in which the cam is rotated at least through a second phase range different from the first phase range and the shutter member is vibrated.