IMAGE FORMING APPARATUS

摘要

An image forming apparatus comprises a drive motor configured to rotate the lower pressure roller, a torque generation unit for generating a breaking force in the direction to hinder rotation of a fixing belt in order to adjust the differential speed between the surface speed of the fixing belt and the surface speed of the lower pressure roller 64, and a control unit for adjusting the breaking force generated by the torque generation unit. The control unit adjusts the breaking force generated by the torque generation unit to decrease if the rotational torque of the drive motor is larger than a predetermined target torque, and increase if the rotational torque of the drive motor is smaller than the predetermined target torque.

主权项

1. An image forming apparatus comprising:
a fixing side member configured to rotate; a back side member configured to rotate in contact with the outer peripheral surface of the fixing side member under pressure, and cooperate with the fixing side member for forming a fixing nip portion and holding and conveying a sheet with a toner image therebetween; a drive motor configured to rotate the back side member; a braking force generation unit configured to generate a breaking force in the direction to hinder rotation of the fixing side member to set a differential speed between the surface speed of the fixing side member and the surface speed of the back side member; a control unit configured to adjust the breaking force generated by the braking force generation unit; and a torque detection unit configured to detect the rotational torque of the drive motor, wherein the control unit adjusts the breaking force generated by the braking force generation unit to decrease if the rotational torque of the drive motor detected by the torque detection unit is larger than a predetermined target torque, and increase if the rotational torque of the drive motor detected by the torque detection unit is smaller than the predetermined target torque.