Showa Electric Wire & Cable Co., Ltd.

Toshio Kida

Toshinobu Asai

Takatoshi Murakami

Shiji Kon

Yoshiyuki Nunome

A method of manufacturing a rubber or plastic-coated roller such as a fixing roller to be used in the thermal fixing part of an electrophotographic copying machine. The method is directed to the production of the rubber or plastic-coated roller by placing a cylindrical mold upright, fitting into the lower part of the cylindrical mold a lower plug provided in the inside thereof with a tapered surface for guiding a core shaft and at the center thereof with a material injection hole, inserting into the cylindrical mold the core shaft having tapered surfaces one each the opposite ends thereof or the core shaft having tapered surface one each at the opposite ends thereof and covered with caps, fitting into the upper part of the cylindrical mold an upper plug provided in the inside thereof with a tapered surface for guiding the core shaft and at the center thereof with an air vent, injecting liquid rubber or plastic under pressure into the cylindrical mold via the material injection hole of the lower plug, and allowing the injected rubber or plastic to set. By this method, there is produced a coated roller the rubber or plastic layer of which is free from eccentricity, and requires no secondary fabrication such as polishing.

Method for producing a rubber or plastic-coated roller

This invention concerns particularly a rubber or plastic-coated roller such as a fixing roller to be used in a thermal fixing part of an electrophotographic copying machine, and a method and an apparatus for production thereof. It effects the production of the rubber or plastic-coated roller by placing a cylindrical mold upright, fitting into the lower part of the cylindrical mold a lower plug provided in the inside thereof with a tapered surface for guiding a core shaft and at the center thereof with a material injection hole, inserting into the cylindrical mold the core shaft having tapered surfaces one each the opposite ends thereof or the core shaft having tapered surface one each at the opposite ends thereof and covered with caps, fitting into the upper part of the cylindrical mold an upper plug provided in the inside thereof with a tapered surface for guiding the core shaft and at the center thereof with an air vent, injecting liquid rubber or plastic under pressure into the cylindrical mold via the material injection hold of the lower plug, and allowing the injected rubber or plastic to set. By this method, there is produced a coated roller the rubber or plastic layer of which is free from eccentricity, and requires no secondary fabrication such as polishing.

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Yokohama, Japan

Toshio Kida