FIXING DEVICE AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To quickly prevent the thermal runaway of a heat source body or the like by detecting the abnormal temperature rise of a fixing belt in an early stage by a heat source controller and to prevent the malfunction of the heat source controller caused by the flapping of the fixing belt and temperature rise in the controllable range of the fixing belt.SOLUTION: A thermostat 38 as the heat source controller for detecting that the temperature of a fixing belt 25 abnormally rises and forcibly stopping a halogen heater 28 is arranged in a position corresponding to a boundary C between a part not covered with a cover member 41 in the halogen heater 28 and a part covered with the cover member 41 in the halogen heater 28 and the upper limit value of a controllable temperature range of the fixing belt 25 and a temperature value indicating the abnormal temperature rise of the fixing belt 25 are clearly identified by the thermostat 38.SELECTED DRAWING: Figure 4