| 摘要 |
A fixing device including a heating belt stretched over heating and fixing rollers is rotated to fix a toner image of a transfer material. A first mode combines heating and rotation stop of the heating belt. A second mode combines heating and rotation of the heating belt. When returning the heating belt for an image forming operation from a non-heating and non-rotation state, the heating belt is controlled by the first mode and then transitioned to the second mode when the heating belt temperature equals or exceeds a predetermined mode transition reference temperature. At the start of the transition to the second mode, the rotation speed of the heating belt is controlled such that a temperature difference between a winding portion of the heating belt that is wound on the heating roller and a non-winding portion that is not wound on the heating roller is decreased.
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