Patent ID: 7493059

Claim:
An image forming apparatus, comprising: an image forming mechanism configured to form a toner image on a recording medium according to image data; a fixing roller configured to fix the toner image on the recording medium by applying heat; a heater configured to heat the fixing roller to warm up the fixing roller; a sensor configured to detect a temperature of the fixing roller; a warm-up mechanism configured to warm up the fixing roller by using the heater; a controller configured to perform a first warm-up control that finishes the warm-up of the fixing roller on either one of conditions that the temperature of the fixing roller detected by the sensor reaches a predetermined first temperature or that a predetermined time period elapses; and the controller configured to perform a second warm-up control that continues the warm-up of the fixing roller until the temperature of the fixing roller detected by the sensor reaches a predetermined third temperature, which is not lower than the predetermined first temperature, when the temperature of the fixing roller detected by the sensor does not reach a predetermined second temperature, which is not higher than the predetermined first temperature, even when the predetermined time period elapses.