Electrophotographic fixing device

An electrophotographic fixing device which comprises in combination:

• a heat fusing roller of elastic heat-insulating material provided at a position to contact a developed image on a reproduction material;
• a press-contacting roller provided at a position to urge said reproduction material against said heat fusing roller, wherein said press-contacting roller deforms the surface of said heat fusing roller;
• and a heating roller provided at a position to heat the peripheral surface of said heat fusing roller, wherein said heating roller is provided with a set temperature and includes means for increasing said set temperature at the time of contact with the reproduction material.

An electrophotographic fixing device which comprises in combination:

• a heat fusing roller of elastic heat-insulating material provided at a position to contact a developed image on a reproduction material;
• a press-contacting roller provided at a position to urge said reproduction material against said heat fusing roller, wherein said press-contacting roller deforms the surface of said heat fusing roller;
• and a heating roller provided at a position to heat the peripheral surface of said heat fusing roller, wherein said heat fusing roller is constructed with a discontinuous surface and has a separation guide member provided at each of the discontinuous portions thereof.

an electrophotographic fixing device which comprises in combination:

• a heat fusing roller of elastic heat-insulating material provided at a position to contact a developed image on a reproduction material;
• a press-contacting roller provided at a position to urge said reproduction material against said heat fusing roller, wherein said press-contacting roller deforms the surface of said heat fusing roller;
• and a heating roller provided at a position to heat the peripheral surface of said heat fusing roller, wherein the diameter of said heat fusing roller is made smaller than the diameter of said heating roller.

An electrophotographic fixing device which comprises in combination:

• a heat fusing roller of elastic heat-insulating material provided at a position to contact a developed image on a reproduction material;
• a press-contacting roller provided at a position to urge said reproduction material against said heat fusing roller, wherein the diameter of the elastic heat fusing roller is made larger than the diameter of the press-contacting roller, and wherein said press-contacting roller deforms the surface of said heat fusing roller;
• and a heating roller provided at a position to heat the peripheral surface of said heat fusing roller, wherein the diameter of said heat fusing roller is made smaller than the diameter of said press-contacting roller.