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Fuser Drive Mechanism

IP.com Disclosure Number: IPCOM000086626D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Williams, GT: AUTHOR [+2]

Abstract

A drum-type xerographic copier includes, among other things, an imaging station, a transfer station and a fusing station. A preferred type of fuser is a hot-roll fuser, wherein the copy sheet passes through the pressure nip formed by a hot roll and a cool backup roll, with the toned side of the sheet in contact with the hot roll. With such a fuser, it is preferred that the fusing nip be closed only when a sheet is in the nip, or, at least, that the time of contact between the two rolls be minimized. For this reason, it is sometimes necessary to open and close the fusing nip for each sheet to be fused.

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Fuser Drive Mechanism

A drum-type xerographic copier includes, among other things, an imaging station, a transfer station and a fusing station. A preferred type of fuser is a hot- roll fuser, wherein the copy sheet passes through the pressure nip formed by a hot roll and a cool backup roll, with the toned side of the sheet in contact with the hot roll. With such a fuser, it is preferred that the fusing nip be closed only when a sheet is in the nip, or, at least, that the time of contact between the two rolls be minimized. For this reason, it is sometimes necessary to open and close the fusing nip for each sheet to be fused.

When the copier requires frequent opening and closing of the fusing nip, it is necessary to insure that such mechanical operation does not introduce velocity errors in the photoconductor movement. Such velocity errors can produce a smearing or loss of resolution on a copy being imaged or transferred.

In the figure, electric motor 10 supplies motive power to photoconductor drum 11 and to the cam 12 which operates to open and close the fusing nip between hot roll 13 and backup roll 14. Drum 11 is driven by motor 10 through belt 15, pulley 16 and gears 17-20.

While the copy paper path is not shown, a sheet first moves into engagement with drum 11 at the transfer station, and then passes through the fusing nip.

In order to isolate the drum from the dynamic disturbance caused by the opening and closing of the fusing nip, cam 12 is driven by chain 2...