Fixing device and image forming apparatus

摘要

A fixing device includes a heating roller and a pressuring roller, a first holding member, a supporting member and a temperature detecting part. The heating roller and pressuring roller sandwiches and heats a sheet to fix a toner image formed on the sheet onto the sheet. The first holding member has a facing part facing to a circumference face of the heating roller to hold the heating roller. The supporting member is made of material with high heat resisting property as compared with the first holding member, arranged between the facing part of the first holding member and the circumference face of the heating roller so as to face to the circumference face of the heating roller, and formed in an elongated shape along an axial direction of the heating roller. The temperature detecting part is arranged in the supporting member to detect temperature of the heating roller.

主权项

1. A fixing device comprising:
a heating roller and a pressuring roller sandwiching and heating a sheet to fix a toner image formed on the sheet onto the sheet; a first holding member having a facing part facing to a circumference face of the heating roller and a recessed part composed of the facing part to hold the heating roller; a supporting member made of material with high heat resisting property as compared with the first holding member, arranged between the facing part of the first holding member and the circumference face of the heating roller and fitted into the recessed part so as to face to the circumference face of the heating roller, and formed in an elongated shape along an axial direction of the heating roller; a temperature detecting part arranged in the supporting member to detect temperature of the heating roller; and bearings rotatably supporting rotation shafts arranged at both ends of the heating roller, wherein the supporting member includes, at both ends, second protruding parts supporting the bearings, the second protruding parts have end parts extending to sides of the bearings and the end parts of the second protruding parts are formed in curved shapes so that curvature centers are matched with centers of the bearings.