Browse Prior Art Database

THICK WALLED HEATED BELT FUSER

IP.com Disclosure Number: IPCOM000026895D
Original Publication Date: 1994-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 6 page(s) / 259K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present disclosure relates generally to a fuser mechanism for an electrophotographic printing machine, and more articularly concerns a thick printing machines. In order to fix or fuse the toner material onto a support member permanently by heat, it is necessary to elevate the temperature of the toner material to a point at which constituents of the toner material coalesce and become tacky. This action causes the toner to flow to some extent onto the fibers or pores of the support members or otherwise upon the surfaces thereof. Generally, roll fusers have a rather small nip contact area and are a speed limiting factor when fusing full color images where a minimum dwell time must be observed. It is desirable therefore to have a belt fuser which can operate at high pressures and have an extended nip so as to increase the fusing speed for multi color images. It is also desirable that such a fuser be externally heated from a single heat source which does not require a large temperature gradient to effectively heat the fuser belt.

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Page 1 of 6

XEROX DISCLOSURE JOURNAL

THICK WALLED HEATED BELT FUSER U.S. C1.355/290
Edul N. Dalal

R. Mark Jacobs

Proposed Classification Int. C1. G03g 15/20

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XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcMApril 1994 137

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Page 2 of 6

THICK WALLED HEATED BELT FUSER (Cont'd)

FIG. 2

138 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcWApril 1994

[This page contains 1 picture or other non-text object]

Page 3 of 6

THICK WALLED HEATED BELT FUSER (Cont'd)

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XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcWApril 1994 139

[This page contains 1 picture or other non-text object]

Page 4 of 6

THICK WALLED HEATED BELT FUSER (Cont'd)

The present disclosure relates generally to a fuser mechanism for an electrophotographic printing machine, and more articularly concerns a thick

printing machines.

In order to fix or fuse the toner material onto a support member permanently by heat, it is necessary to elevate the temperature of the toner material to a point at which constituents of the toner material coalesce and become tacky. This action causes the toner to flow to some extent onto the fibers or pores of the support members or otherwise upon the surfaces thereof. Generally, roll fusers have a rather small nip contact area and are a speed limiting factor when fusing full color images where a minimum dwell time must be observed. It is desirable therefore to have a belt fuser which can operate at high pressures and have an extended nip so as to increase the fusing speed for multi color images. It is also desirable that such a fuser be externally heated from a single heat source which does not require a large temperature gradient to effectively heat the fuser belt.

As shown in Figure 1, the fuser apparatus 90 is made up of a heater roll 75, a thick walled fusing belt 74 supported by rollers 73 and a pressure roll 72. The configuration illustrated allows the belt 74 to be wrapped around a relatively large portion of the heater roll 75 to effect a good heat transfer without necessitating extraordinarily high heating temperatures. The wrap allows a longer dwell time thereby heating the belt 74 in a more uniform manner. Preferably the external heating roll 75 is constructed out of aluminum with an internal quartz lamp heating element 76 as is illustrated in Figure 1. Of course other known heating elements such as a quartz lamp or other radiant heat devices (provided the paper path is shielded from the heat source so as to prevent scorching of a jammed sheet) and roll materials could also be utilized.

walled belt fusing system for use particularly in P ull color electrophotographic

The belt 74 is also wrapped over a greater portion of pressure roll 72 to create a larger fusing nip than is possible in a conventional fuser roll system. It is this extended fusing nip that results in a longer fusing dwell time and thus allows faster fusing speeds. As...