Patent ID: 6351619
Filing Date: 2002-02-26
Classification: G03G

Abstract:
A belt type fixing device comprising:an endless belt; a conveyor roller supporting said belt such that said belt is rotatable; a first heat source for heating said belt; a press roller for pressing a recording medium against said belt; a hollow roller contacting an outer surface of said belt, wherein said hollow roller is rotatable in a same direction as said belt, as seen at a position where said hollow roller and said belt contact each other, at a peripheral speed equal to or higher than a peripheral speed of said belt; a second heat source disposed in or adjoining said hollow roller; a controller configured to control a driving of said fixing device and said hollow roller, wherein said fixing device and said hollow roller are not driven until a surface layer, included in said hollow roller, reaches at least a temperature higher than a softening point of toner; first temperature sensing means for sensing a temperature of a surface layer included in said hollow roller, wherein said second heat source is controlled on the basis of the temperature being sensed by said first temperature sensing means; and second temperature sensing means for sensing a temperature of a surface layer included in said belt, wherein said first heat source is so controlled as to cause the temperature being sensed by said second temperature sensing means to coincide with a first preselected temperature while said second heat source is so controlled as to cause the temperature being sensed by said first temperature sensing means to coincide with a second preselected temperature lower than or equal to said first preselected temperature.