Patent ID: 9400466
Filing Date: 2016-07-26
CPC Classification: G03G

Claim Text:
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 configured to be movable between an open position and closed position, the sensor being exposed to the image-bearing member at the open position, the sensor being shielded from the image-bearing member at the closed position; a rotatable cam configured to move the shutter member, the cam being rotatable in a first phase range and a second phase range, the second phase range being not contained in the first phase range, a distance from a rotation center of the cam continuously increasing or decreasing in a circumferential direction in the first phase range, the distance varying in a stepped manner in the circumferential direction in the second phase range; and an execution portion capable of selectively executing a first mode and a second mode, the cam being rotated within the first phase range for moving the shutter member from the open position to the closed position mutually in the first mode, the cam being rotated at least through the second phase range for applying an impact to the shutter member in the second mode.