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Browse Prior Art Database

Hot Roll Fuser

IP.com Disclosure Number: IPCOM000048530D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Machmer, JA: AUTHOR

Abstract

Silicone oil is metered to the hot roll of a xerographic hot roll fuser when the fusing nip closes or, in the alternative, when a copy sheet is to be fused.

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Hot Roll Fuser

Silicone oil is metered to the hot roll of a xerographic hot roll fuser when the fusing nip closes or, in the alternative, when a copy sheet is to be fused.

In the figure, hot roll 10 is mounted to rotate about fixed-postion axis 11. This hot roll is internally heated, and is covered by a relatively soft elastomeric sleeve whose outer surface engages and fuses xerographic toner carried by copy paper
12.

The fusing nip is formed by force-loading rigid backup roll 13 into the soft hot roll. Roll 13 freely rotates on link 14, about axis 30. Link 14 is pivoted at fixed- position pivot 15. Rotatable cam 16 operates to open and close the fusing nip. The nip, as shown, is closed. In order to open the nip, cam 16 rotates counterclockwise 180 degrees.

A container 17 of silicone oil 18 is mounted above hot roll 10. A conduit 19, which includes valve 20. filter 21, metering orifice 22 and wick 23, communicates silicone oil to the external fusing surface of the hot roll by way of wick 23. Valve control rod 24 operates to open valve 20 when the fusing nip closes.

When the xerographic device is not in use, the fusing nip is open, and valve 20 is closed. In this stand-by condition, oil-soaked wick 23 prevents air from entering the bottom end of conduit 19, while valve 20 prevents oil from entering the top end of the conduit. Thus, oil seepage to the hot roll is prevented during non-use of the device.

When valve 20 subsequently opens, orifice 22 meters a controlle...