Fixing unit for picture image forming equipment having a three layered fixing roller
AssigneeFuji Xerox Co., Ltd.
InventorYutaka Inasaki
Life of this patent
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Abstract
A fixing unit for picture image forming equipment including a heating roller and a pressure roller, fixes unfixed picture images formed on paper by applying heat thereto. The fixing unit for a picture image forming equipment includes a pressure roller having a structure consisting of three layers, namely, a silicone sponge layer, a silicone rubber layer, and a relatively hard tubular layer, which are arranged in the stated order outwards from the central part to the outermost shell. The tubular layer is a tetrafluoroethylene fluorocarbon polymer layer having a thickness in the range from 30 .mu.m to 70 .mu.m. The silicone sponge layer has a thickness in the range of 50% to 60% of the outside diameter of the pressure roller.
Claims3
A fixing unit for picture image forming equipment, comprising:
- a heating roller;
- a pressure roller contacting said heating roller along a pressure line, said pressure roller having at least three layers including an innermost silicone sponge layer, an intermediate silicone rubber layer and an outer polytetrafluoroethylene layer;
- means for creating pressure between the rollers along the pressure line,
- wherein said innermost silicone sponge layer has a thickness in the range of 50 to 60 percent of the outside diameter of the pressure roller.
Dependencies are inferred from the claim text.