ABNORMAL TEMPERATURE RISING PREVENTION DEVICE FOR FIXING DEVICE

摘要

PROBLEM TO BE SOLVED: To forcedly interrupt energizing of a heating roll when the temperature of the heating roll arranged in a fixing device rises to an abnormal temperature. ;SOLUTION: The heating roll 10 arranged in the fixing device is rotated in the direction of the arrow R, and a heating lamp 12 is disposed at the inside of the roll 10. The heating lamp 12 is connected to a controller 30 through circuits L₁ and L₂, and is electrically heated. A bimetal 40 is attached on the outer peripheral surface of the heating roll 10 by a fixing part 42 and a switch 50 is provided opposed to the bimetal 40. When the temperature of the heating roll 10 rises to an abnormal temperature set, the bimetal 40 is thermally deformed and pushes the lever 52 of the switch 50, so that a contact 54 is opened and the circuit L₂ for the heating lamp is opened.;COPYRIGHT: (C)1997,JPO