Browse Prior Art Database

A LOW COST INSTANT-ON FUSTNG SYSTEM

IP.com Disclosure Number: IPCOM000025977D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

It is known to provide instant-on roll fusers by gluing a foil heating layer inside a nickel tube and outside a filament wound tube. The drawbacks of putting the heater circuit on the inside surface of a Ni tube are defects in the Ni tube and cost and difficulty in fabrication. Putting the heater circuit on the outside surface of a tube is a simpler and cost effective process.

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XEROX DISCLOSURE JOURNAL

I

A LOW COST INSTANT-ON FUSTNG SYSTEM U.S. C1.355/3FU Shy-Shung Hwang

Proposed Classification

Int. C1. G03g 15/00

It is known to provide instant-on roll fusers by gluing a foil heating layer inside a nickel tube and outside a filament wound tube. The drawbacks of putting the heater circuit on the inside surface of a Ni tube are defects in the Ni tube and cost and difficulty in fabrication. Putting the heater circuit on the outside surface of a tube is a simpler and cost effective process.

Furthermore, by designing the heating foil width/pitch ratio to be greater than a certain fraction, the outermost metallic layer for heat distribution is not required. This will further minimize the cost, warm-up time, and the fabrication process. For instance, if the width of heating foil is greater the 70% of the spatial pitch, the variation of roller surface temperatures becomes less than 1% for the case of spatial pitch = 0.085 in., mean roller surface temperature = 374oF, and heat flow of 25 W/in2.

The fuser roller can be fabricated by adding a heating foil layer on the outside surface of an insulating tube. Plastics with good dimensional stability and insulating characteristics under high temperatures (400oF), such as polyimides or their copolymers (amide-imide and ether-imide) with or without reinforcer, are good candidates for this tube. Ultem produced by G.E., which can be molded or extruded, is also an attractive candidate.

The thin heating foi...