Electric heating – Heating devices – Combined with diverse-type art device
Patent
1980-09-19
1982-05-11
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
Combined with diverse-type art device
219469, 219388, 355 3FU, 432 60, H05B 100
Patent
active
043295657
ABSTRACT:
An image fixing device for an electrophotographic copying apparatus and the like including a fixing roller and a pressing roller in pressing contact with each other. The fixing roller includes a metallic core, a resilient material layer and an offset preventing layer superposed one over another in the indicated order and having a heating member disposed therein for heating the metallic core. A copy sheet formed thereon with a toner image is passed between the two rolls so that the toner image will be fixed to the copy sheet by melt adhesion by being pressed between them while being heated. The offset preventing layer has a higher heat intake than the toner image so as to be highly responsive to heat. The offset preventing layer is formed of a material containing a synthetic resinous material, such as silicone rubber, silicone resin, etc., which is highly resistant to heat and which has a high parting property, added with over 1% by weight of metal powder of high thermal conductivity. To prevent the temperature at the surface of the fixing roll from dropping from a level necessary for obtaining satisfactory fixing of images when a plurality of toner images are consecutively fixed, the resilient material layer preferably has a thermal conductivity of over 1.times.10.sup.-3 cal/cm..degree.C. sec.
REFERENCES:
patent: 3884181 (1975-05-01), Thettu
patent: 3902845 (1975-09-01), Murphy
patent: 4019024 (1977-04-01), Namiki
patent: 4087676 (1978-05-01), Fukase
patent: 4150181 (1979-04-01), Smith
patent: 4216327 (1980-08-01), Idstein
Higashi Yuichiro
Namiki Ryoichi
Mayewsky Volodymyr Y.
Ricoh Co. Ltd.
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