Rubber or plastics-coated roller and method and apparatus for production thereof.

摘要

This invention concerns particularly a rubber or plastics-coated roller, such as a fixing roller to be used in the 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 plastics-coated roller by placing a cylindrical mold 3 upright, fitting into the lower part of the cylindrical mold 3 a lower plug 40 provided in the inside thereof with a tapered surface 51 for guiding a core shaft 1 and at the centre thereof with a material injection hole 42, inserting into the cylindrical mold 3 the core shaft 1 having tapered surfaces 1c one each at the opposite ends thereof or the core shaft 1 having tapered surface 1c one each at the opposite ends thereof and covered with caps 50, 60, fitting into the upper part of the cylindrical mold 3 an upper plug 70 provided in the inside thereof with a tapered surface 71 for guiding the core shaft 1 and at the centre thereof with an air vent 72, injecting rubber or plastics liquid under pressure into the cylindrical mold 3 via the material injection hole 42 of the lower plug 40, and allowing the injected rubber or plastics liquid 8 to set. By this method, there is produced a coated rollerthe rubber or plastics layer of which is free from eccentricity, and requires no secondary fabrication such as polishing.