Patent ID: 8805227

Claim:
An image forming apparatus including a fixing device that includes a heating rotating body and a pressurizing rotating body forming a fixing nip by the pressurizing rotating body applying pressure to the heating rotating body, and commencing an image forming operation with respect to a recording sheet following a warm-up operation during which a temperature of the heating rotating body reaches a predetermined temperature that is lower than a fixing temperature, the image forming apparatus comprising: a temperature acquisition unit that acquires an index value indicating a temperature of the pressurizing rotating body upon commencement of the warm-up operation; and a control unit that is configured to when the index value is smaller than a predetermined threshold value, perform a first control of heating the heating rotating body until the temperature of the heating rotating body reaches the fixing temperature while causing the heating rotating body and the pressurizing rotating body to rotate at a first speed, and when the index value is equal to or greater than the predetermined threshold value, perform a second control of (i) heating the heating rotating body until the temperature of the heating rotating body reaches the predetermined temperature while causing the heating rotating body and the pressurizing rotating body to rotate at a second speed that is slower than the first speed and (ii) heating the heating rotating body until the temperature of the heating rotating body reaches the fixing temperature while causing the heating rotating body and the pressurizing rotating body to rotate at the first speed after the temperature of the heating rotating body reaches the predetermined temperature.