| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus in which the uniform nip width between a backup roller and a heat roller can be obtained even in case the backup roller bends in its axial direction due to web tension. SOLUTION: The electrophotographic image forming apparatus, in which a fixing means has a heat roller, a pressure roller, and a cleaning means for clearing away residual toner on the heat roller, is characterized in that the cleaning means has a backup roller which is in contact with and pressed against the backup roller, the backup roller is a two-layer structure consisting of a metal shaft core and an elastic layer, formed of an elastic body, which is disposed on the external layer of the shaft core, and the shape of the backup roller is such that the diameters of its both ends are smaller than the diameter of its central part in the longitudinal direction, and the diameter of the central part is 10 to 30 mm. COPYRIGHT: (C)2004,JPO |
