| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixing device which can perform satisfactory image fixing at all times and can prevent the occurrence of wrinkles in a recording medium. SOLUTION: Recording paper P is held between a fixing roll 1 and a first pad 3a provided to a pressing pad 3 via an endless belt 2 and a toner image is press-fixed to the recording paper by being heat melted. In the pressing surface of the first pad 3a, the ratio a/b (=α) between the size "a" in the circumferential direction in the central part in the width direction of the endless belt 2 and the size "b" in the circumferential direction on both ends in the width direction is 1>α>0.3. By making the ratio 1>α, the carrying force of the recording paper P is made greater in the vicinity of both ends than in the central part in the width direction in a nip part of the first pad 3a and the fixing roll 1. Thus, a pulling force in the width direction is applied to the endless belt 2 and the recording paper P in the upstream side of the nip part and occurrence of wrinkles is prevented. Furthermore, by making the ratioα>0.3, fixing which is approximately uniform in the width direction can be carried out satisfactorily. COPYRIGHT: (C)2005,JPO&NCIPI
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