Browse Prior Art Database

Protection of the Temperature Sensing Zone of a Hot Roll Fuser

IP.com Disclosure Number: IPCOM000084772D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Brown, LC: AUTHOR [+4]

Abstract

In an electrophotographic reproduction system in which thermoplastic toner material is distributed on a substrate, the toner material is adhered to the substrate by passing the substrate and toner between a pair of rollers, at least one of which is heated. U. S. Patent 3,809,855 discloses means for thermal sensing a hot roll unit in such an electrophotographic reproduction apparatus. In the referenced patent, a contact type thermal sensing apparatus for the hot roll is described in detail. In operation, the system requires that an exposed, clean, conductive metal surface on the roll, usually at or near one end, be available for electrical and thermal contact.

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Protection of the Temperature Sensing Zone of a Hot Roll Fuser

In an electrophotographic reproduction system in which thermoplastic toner material is distributed on a substrate, the toner material is adhered to the substrate by passing the substrate and toner between a pair of rollers, at least one of which is heated. U.

S. Patent 3,809,855 discloses means for thermal sensing a hot roll unit in such an electrophotographic reproduction apparatus. In the referenced patent, a contact type thermal sensing apparatus for the hot roll is described in detail. In operation, the system requires that an exposed, clean, conductive metal surface on the roll, usually at or near one end, be available for electrical and thermal contact.

In one type of fusing system, the hot roll is capable of being reversed, end-to- end, so that at various times both ends of the roll must be used for contact thermal sensing. However, in operation, the end of the roll which is not being sensed is subject to corrosion, contamination, and the accumulation of vagrant toner.

Now, in order to protect the end of the roll which is not being sensed from contamination, a ring is placed on the roll surface for its protection. One preferred ring composition is provided in the form of a band of SILASTIC* E silicone polymer supplied by Dow Corning Corp. Silicone E is useful for this function because of its high-tear resistance, stability under high-temperature conditions, and its low-surface energy which disc...