Patent ID: 7689135
Filing Date: 2010-03-30
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a rotary developing unit, to and from which a plurality of developing cartridges storing developers are attached and detached and which moves one of the attached developing cartridges to a developing position by being rotated around a rotation axis; a drive motor that rotates the rotary developing unit; and a controller that controls a torque of the drive motor in response to a condition of the developing cartridges to be attached to the rotary developing unit and/or a condition of the rotary developing unit, wherein the torque of the drive motor is determined based on an amount of current to be fed to the drive motor, and the controller controls the torque of the drive motor by controlling the amount of current to be fed to the drive motor in response to the condition of the developing cartridges and/or the condition of the rotary developing unit.