Patent ID: 9188917
Filing Date: 2015-11-17
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a fuser unit, which includes a heating member, a heat source configured to heat the heating member, and a backup member configured to nip a recording sheet between itself and the heating member; a temperature detector, which is configured to detect a temperature of the heating member; and a control unit, which is configured to start print control when the temperature detected by the temperature detector reaches a fixing temperature when a print command is received while the temperature of the heating member is increasing to the fixing temperature, and which is configured to perform decreasing control when the detected temperature reaches a predetermined temperature higher than the fixing temperature, so that the detected temperature is decreased to the fixing temperature, wherein, in a case that an increasing rate of the detected temperature at a beginning of the print control is equal to or less than a predetermined value, the control unit is configured to control the heat source so that a heat quantity radiated from the heat source during the decreasing control becomes larger than in a case that the increasing rate of the detected temperature at the beginning of the print control is larger than the predetermined value, and wherein the control unit is configured to calculate the increasing rate based on a temperature history during printing on a plurality of recording sheets, wherein, in the case that the increasing rate of the detected temperature at the beginning of the print control is larger than the predetermined value, the control unit is configured to control the heat source so that the detected temperature is decreased during a first predetermined time period during the decreasing control, and wherein, in the case that the increasing rate of the detected temperature at the beginning of the print control is equal to or less than the predetermined value, the control unit is configured to control the heat source so that the detected temperature is decreased during a second predetermined time period longer than the first predetermined time period, during the decreasing control.