The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 1982
Filed:
Sep. 19, 1980
Ryoichi Namiki, Yokohama, JP;
Yuichiro Higashi, Kawasaki, JP;
Ricoh Co., Ltd., , JP;
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.