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Quick Warm-Up Hot Roll Fuser

IP.com Disclosure Number: IPCOM000049112D
Original Publication Date: 1982-May-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Machmer, JA: AUTHOR [+2]

Abstract

A xerographic hot roll fuser is provided having a low thermal mass working surface. This is achieved by insulating the working surface or skin from the underlying hot roll core. The roll is preferably heated externally. Since such a hot roll may exhibit a tendency to distort under load, it is mounted on a rigid, nonrotating axle which is bent to compensate for any such distortion.

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Quick Warm-Up Hot Roll Fuser

A xerographic hot roll fuser is provided having a low thermal mass working surface. This is achieved by insulating the working surface or skin from the underlying hot roll core. The roll is preferably heated externally. Since such a hot roll may exhibit a tendency to distort under load, it is mounted on a rigid, nonrotating axle which is bent to compensate for any such distortion.

Figs. 1 and 2 are an end view and a longitudinal view, respectively, of this fuser. In Fig. 1, the thickness of the various hot roll layers is exaggerated for clarity of viewing.

Hot roll 10 mates with cold backup roll 11 to form fusing nip 12. A sheet of copy paper 13, bearing a toner image on its upper side, is fused as it passes through the fusing nip.

Hot roll 10 includes a thin, flexible outer sheath 14 of an elastomer known to possess the properties needed by fuser hot rolls. This elastomer includes a darkening agent, or its external surface is otherwise colored, to better enable external heating of the hot roll by heat source 15. Preferably. nip 12 closes only when paper 13 is available for fusing. During standby, nip 12 is open. However, hot roll 10 may continue to rotate when the nip is open in order to heat the roll's external surface, perhaps with a lower level of heater energization than is used when paper is being fused. upon initial turn-on of the xerographic device, the hot roll is rotated, with the fusing nip open and the heater energized, in order to bring the xerographic device to a "ready" conditio...