Patent ID: 9025974
Filing Date: 2015-05-05
Classification: G03G

Abstract:
1. A fixing device for thermally fixing an unfixed image on a recording sheet, comprising: a heating rotor including a cylindrical resistance heating layer, and configured to fix an unfixed image on a recording sheet by thermal fusion bonding using heat generated by the resistance heating layer, the resistance heating layer generating heat when supplied with power and configured to rotate with the heating rotor in a rotation direction relative to the fixing device; a power supply unit configured to supply power to the resistance heating layer; a heat sensitive resistor having an elongated shape extending along an entire length of an axis of the resistance heating layer, located to face a portion of a circumferential surface of the resistance heating layer, and configured to exhibit a change in resistance according to a temperature of the portion of the resistance heating layer, the heat sensitive resistor being fixed with respect the fixing device; and an abnormal heat determination unit configured to determine whether the temperature of the portion of the resistance heating layer has reached an abnormal temperature by detecting the change in resistance of the heat sensitive resistor, the abnormal temperature possibly causing damage to the resistance heating layer.