Patent ID: 9405246
Filing Date: 2016-08-02
CPC Classification: G03G

Claim Text:
1. A fixing device comprising: a fixing belt configured to be rotatable around a rotation axis; a pressuring member configured to be rotatable and to come into pressure contact with the fixing belt so as to form a fixing nip; a heat source arranged at an inner diameter side of the fixing belt, provided at a position displaced from the rotation axis and configured to heat the fixing belt; a pressing member configured to press the fixing belt to a side of the pressuring member; and a first heating stop device configured to face an outer circumferential face of a closest part to the heat source of the fixing belt and to operate at a first operating temperature so as to stop the heat source from heating the fixing belt; wherein, when the heat source heats the fixing belt in a state where a rotation of the fixing belt is stopped, the closest part to the heat source of the fixing belt is deformed by a thermal expansion and comes into contact with the first heating stop device and the first heating stop device operates, the fixing device further comprising a second heating stop device configured to face an outer circumferential face of an end part at an upstream side or an end part at a downstream side of the fixing belt in a conveying direction of a recording medium and to operate at a second operating temperature so as to stop the heat source from heating the fixing belt, wherein, when the fixing belt is broken in a circumferential direction, the fixing belt is deformed so that the end part at the upstream side or the end part at the downstream side of the fixing belt comes into contact with the second heating stop device and the second heating stop device operates.