Patent ID: 9014587
Filing Date: 2015-04-21
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a fixing member configured to fix an image to a medium by heating the medium; a heating member configured to heat the fixing member; a pressure member pressed against the fixing member so as to press the medium against the fixing member; a first temperature detection unit that detects a temperature of the fixing member; a second temperature detection unit that detects a temperature of the pressure member; and a control unit that controls a rotation speed of the fixing member; wherein the control unit controls the rotation speed of the fixing member based on a temperature difference between the temperature detected by the first temperature detection unit and the temperature detected by the second temperature detection unit; wherein the control unit has a plurality of selectable printing speeds that define rotation speeds of the fixing member when the medium passes the fixing member, and has a plurality of selectable speed-change-decision criterion temperature differences respectively corresponding to the printing speeds; and wherein the control unit selects one of the speed-change-decision criterion temperature differences according to the selected printing speed, and determines the rotation speed to be the same as or different from the printing speed based on the selected speed-change-decision criterion temperature difference.