Patent ID: 10955790

Abstract:
An image forming apparatus, having a motor, a first photosensitive drum, a second photosensitive drum, a first developing roller, a second developing roller, a first cam, a second cam, a first clutch, a second clutch, a first phase sensor, and a controller, is provided. On condition that a triggering condition is satisfied, the controller starts the motor to operate, place the first clutch in a transmittable condition to cause the first developing roller to move for a first separated position, and place the second clutch in a discontinuing condition; and place the second clutch in the transmittable condition to cause the second developing roller to move to the second separated position in one of cases where a predetermined period since the first clutch is placed in the transmittable condition elapses and where the controller receives the separation signal from the first phase sensor before the predetermined period elapses.