Image forming apparatus

摘要

An image forming apparatus includes a fixing portion for heating and fixing an unfixed image formed on a recording material, the fixing portion including a cylindrical film, a heater provided in an inside space of the film, a switch portion actuatable by heat from the heater, and a protection element for shutting off electric power supplied to the heater; a DC voltage source for generating a DC voltage from a commercial AC voltage source. The protection element is connected in a DC circuit operable by the DC voltage source, and when the switch portion is rendered off, the electric power supply to the heater is shut off.

主权项

1. An image forming apparatus comprising:
a fixing portion configured to heat and fix an unfixed image formed on a recording material, said fixing portion including a cylindrical film, a heater disposed in an inside space of said film, and a protection element, having a switch portion actuatable by heat from said heater, configured to shut off electric power supplied to said heater; a DC voltage source configured to generate a DC voltage from a commercial AC voltage source; a controller configured to control an electric power supply to said heater, a relay connected in an electric power supply line to said heater, wherein said protection element is disposed in the inside space of said film, wherein said protection element is connected in a DC circuit operable by said DC voltage source and is connected in said DC circuit extending from said controller to said relay, and wherein when said switch portion is rendered off, said relay is rendered off to shut off the electric power supply to said heater.