Patent ID: 7603073

Claim:
An image forming apparatus comprising: an image supporting member disposed to be rotatable; a belt facing the image supporting member and disposed to be rotatable; a belt drive unit for rotating the belt; an acceleration and deceleration information storage unit for storing acceleration and deceleration information to control acceleration and deceleration of the belt; and a belt speed control unit for controlling the belt drive unit to adjust a speed of the belt according to the acceleration and deceleration information stored in the acceleration and deceleration information storage unit, said belt speed control unit determining a difference between a first moving amount corresponding to rotations of the image supporting member from a stationary state thereof to a specific speed and a second moving amount corresponding to rotations of the belt from a stationary state thereof to the specific speed, said belt speed control unit controlling the belt drive unit to start decelerating the belt after the image supporting member starts decelerating and before the image supporting member stops rotating, and controlling the belt drive unit to stop the belt after the image supporting member stops rotating so that a third moving amount corresponding to rotations of the belt from the specific speed to the stationary state thereof becomes larger than a fourth moving amount corresponding to rotations of the image supporting member from the specific speed to the stationary state thereof according to the difference between the first moving amount and the second moving amount.