Image Forming Apparatus with Operation Stopping Control Upon Temperature Sensing in Fixing Device

Abstract

An image forming apparatus includes a heat source, a thermal fixing member, a temperature sensing unit, a temperature change determining unit and a halting unit. The heat source generates heat. The thermal fixing member is heated by the heat source and performs a thermal fixing operation by thermally fixing a toner image deposited on a sheet of paper. The temperature sensing unit senses a temperature of the thermal fixing member and outputs temperature data. The temperature change determining unit determines that the temperature of the thermal fixing member decreases based on two pieces of temperature data sensed by the temperature sensing unit at two different timings. The halting unit halts the thermal fixing operation when determination made by the temperature change determining unit is consecutively made for a predetermined number of times.

Dependencies are inferred from the claim text.