| 摘要 |
PROBLEM TO BE SOLVED: To improve heat supply efficiency for a heating member constituting a fixing device.SOLUTION: In a fixing device 70 of a belt system, using an endless fixing belt 73 as a member for heating a sheet P or the like, at fixing processing of a toner image of the sheet P or the like, control is performed so that supply power to a heat source 71L of a fixing roll 71 is the lowest, among the fixing roll 71, an internal heating roll 75, and an external heating roll 76, and the supply power to heat sources 75L, 76L of the internal heating roll 75 and the external heating roll 76 is made to increase. In addition, at the fixing processing of the toner image of the sheet P or the like, control is performed so that temperature of the external heating roll 76 in contact with an outer peripheral surface of the fixing belt 73 is the highest, among the fixing roll 71, the internal heating roll 75, and the external heating roll 76. |
