Abstract: A pressing device includes a pressed unit, a pressing member, a support shaft, and a drive transmission mechanism. The pressed unit is supported to be rotatable. The pressing member presses the pressed unit. The support shaft supports the pressing member such that the pressing member is rotatable. The drive transmission mechanism transmits a drive force of a drive source to the pressed unit, is disposed on the pressing member, and includes a pressing-member-side drive transmission member to transmit the drive force to a unit drive transmission member of the pressed unit. The support shaft is disposed coaxially on a fulcrum of rotation of the pressed unit.

Abstract: A drive mechanism that drives a rotator to rotate includes a main motor, an assist motor, and processing circuitry. The main motor drives the rotator. The assist motor drives the rotator and assists a drive of the rotator by the main motor. The processing circuitry controls a speed of the main motor so that a rotational speed of the rotator is constant, and controls a motor voltage of the assist motor so that the motor voltage of the assist motor changes according to a change in a motor current of the main motor.

Abstract: A drive mechanism that drives a rotator to rotate includes a main motor, an assist motor, and processing circuitry. The main motor drives the rotator. The assist motor drives the rotator and assists a drive of the rotator by the main motor. The processing circuitry controls a speed of the main motor so that a rotational speed of the rotator is constant, and controls a motor voltage of the assist motor so that the motor voltage of the assist motor changes according to a change in a motor current of the main motor.