Abstract For use in a xerographic reproducing apparatus, a fuser roll structure comprising a core member having a sleeve carried thereby and a heat source disposed internally or externally of the core member. The fuser roll structure is characterized by the fabrication process wherein the sleeve is elevated in temperature above the operational temperature of the fuser roll structure and/or the core is chilled below ambient or room temperature. The sleeve is then installed on the core, and the assembly allowed to return to normal room temperature thereby creating a secure shrink fit of the sleeve onto the core. Structurally, the fuser roll comprises a sleeve the inside diameter of which is slightly larger than the outside diameter of the core when the sleeve temperature is elevated above said operational temperature and/or the core is chilled below said room or ambient temperature. At the operating temperature or below the aforementioned shrink fit exists. The process is also suitable for the fabrication of other types of roll structures for employment in a xerographic reproducing apparatus, for example, transport rolls which move the copy paper through the apparatus.
Fuser apparatus for use in reproducing apparatus, including: an elongated rigid core member having a generally circular cross section adapted to be mounted for rotation about its longitudinal axis; a sleeve member having an inside diameter slightly greater than the outside diameter of said core when the temperature of said sleeve is elevated above the operational temperature of said fuser apparatus and/or the core is chilled below ambient temperature and wherein the outer surface of said rigid core securely engages the inner surface of said sleeve when the sleeve-core assembly is at or below operating temperature; and means for elevating the temperature of said sleeve member whereby toner images supported on substrates are softened when they are contacted by said sleeve.
Claim 2
Dependent Claim
121 words
Fuser apparatus for use in reproducing apparatus, including: an elongated rigid core member having a generally circular cross section adapted to be mounted for rotation about its longitudinal axis; a sleeve member having an inside diameter slightly greater than the outside diameter of said core when the temperature of said sleeve is elevated above the operational temperature of said fuser apparatus and/or the core is chilled below ambient temperature and wherein the outer surface of said rigid core securely engages the inner surface of said sleeve when the sleeve-core assembly is at or below operating temperature; and means for elevating the temperature of said sleeve member whereby toner images supported on substrates are softened when they are contacted by said sleeve.
Claim 3
Dependent Claim
18 words
Apparatus according to claim 1 wherein the outer surface of said sleeve is coated with a fluorocarbon resin.
Claim 4
Dependent Claim
24 words
Apparatus according to claim 2 wherein said means for elevating the temperature of said sleeve comprises a heater disposed internally of said core member.