| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus, which can accurately correct a nip transport speed of a fixing nip part according to a temperature change of a fixing device in simple apparatus configuration. SOLUTION: The image forming apparatus 1 includes: an endless fixing belt 52 stretched between a heat roller 55 containing a heater lamp 55a and a fixing roller 53; a pressure roller 54 disposed in pressure contact with the fixing belt 52; a thermistor 84 for detecting the temperature of the fixing belt 52; a driving means 57 having a motor for driving the pressure roller 54 in rotation; and a control part 74 for controlling the rotation of the driving means 57, wherein a paper sheet P where an unfixed toner image is supported is passed through a nip part N formed by pressure contact of the fixing belt 52 and the pressure roller 54 to perform heat fixing. The control part 74 controls the rotational frequency of the driving means 57 based on the detected temperature of the thermistor 84, so that the pressure roller 54 achieves a predetermined peripheral speed regardless of the temperature of the heating roller. COPYRIGHT: (C)2009,JPO&INPIT |
