Heat roller type fixing apparatus for electrophotographic copying machine

A heat roller type fixing apparatus for electrophotographic copying machine comprising:

• a heat roller containing a heating element, the heating element having a heating characteristic such that, when said heating element is energized, the surface of the heat roller exhibits a minimum low temperature area at its longitudinally central portion and a maximum high temperature areas on both sides of the minimum low temperature area;
• and spaced longitudinally therefrom a press roller which presses against and rotates with the heat roller;
• a temperature sensing element for detecting the surface temperature of the heat roller;
• a control circuit which controls the operation of the heating-element in response to the output from the temperature sensing element, the improvement comprising that said temperature sensing element is located midway between said minimum low temperature area and one of said maximum high temperature areas.