IMAGE FORMING APPARATUS

• Main Authors: MICHIDA KAZUHIRO, YOSHIDA TSUGUHIRO, SATO YUTAKA, WAKATSU KOHEI, NAKAGAWA TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 18.03.2021
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To reduce temperature unevenness in the longitudinal direction of a fixing device.SOLUTION: An image forming apparatus comprises: a pair of sub thermistors 60, 61 that are provided at positions corresponding to both ends of a heating element 54b3; a pair of paper width sensors 31a that are provided on the upstream side of a fixing device 50 in a conveyance direction and provided at positions corresponding to both ends of a heating element 54b1; a pair of paper width sensors 31b that are provided on the upstream side of the fixing device 50 in the conveyance direction and provided at positions corresponding to both ends of a heating element 54b2; and a CPU 94 that determines the width of a recording material based on results of detection performed by the paper width sensors 31a, 31b and the sub thermistors 60, 61.SELECTED DRAWING: Figure 6 【課題】定着装置の長手方向の温度ムラを低減すること。【解決手段】発熱体５４ｂ３の両端に対応する位置に設けられた１対のサブサーミスタ６０、６１と、搬送方向において定着装置５０よりも上流側に設けられ、発熱体５４ｂ１の両端に対応する位置に設けられた１対の紙幅センサ３１ａと、搬送方向において定着装置５０よりも上流側に設けられ、発熱体５４ｂ２の両端に対応する位置に設けられた１対の紙幅センサ３１ｂと、紙幅センサ３１ａ、３１ｂ及びサブサーミスタ６０、６１の検知結果に基づいて、記録材の幅を判断するＣＰＵ９４と、を備える。【選択図】図６