| 摘要 |
Provided is a fixing device including: at least a heating roller, a fixing roller, a heating belt which is stretched over the heating roller and the fixing roller, is heated by the heating roller, and is rotated by a driving unit so as to fix a toner image of a transfer material, and a bias preventing unit of the heating belt provided in the heating roller, wherein a first mode which is a combination mode of the heating of the heating belt and the rotation stop of the heating belt and a second mode which is a combination mode of the heating of the heating belt and the rotation of the heating belt are set, at the time of returning of the heating belt for an image forming operation from non-heating and non-rotation of the heating belt, the heating belt is controlled by the first mode and the heating belt is controlled by the second mode transitioned from the first mode, when a temperature of the heating belt becomes equal to or larger than a predetermined mode transition reference temperature, the transition from the first mode to the second mode is performed, and at the time of the start of the transition to the second mode, the heating belt is rotated in a direction reverse to a rotation direction during image formation and is rotated in the same direction as the rotation direction during the image formation.
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