Browse Prior Art Database

HIGH SPEED NON-CONTACT FUSING

IP.com Disclosure Number: IPCOM000025215D
Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 114K

Publishing Venue

Xerox Disclosure Journal

Abstract

Flash fusing is perceived to be a significant opportunity in high volume products to achieve high reliability and low shutdown rates. It has the added benefit of no oil on copy to hinder typing on copies. This opportunity comes at a significant cost, however, in terms of manufacturing cost, size of the power supplies, saÔéČety concerns, air and heat removal requirements and effluent management. Flash fusers typically operate with a pulse width of one to a few milliseconds. In general, fusing efficiency tends to degrade slightly with longer pulse widths but the level of effluent drops dramatically due to lower peak toner temperatures. This makes for a difficult tradeoff between higher capacity effluent collectors/filters and the larger high voltage power supplies and system power.

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XEROX DISCLOSURE JOURNAL

HIGH SPEED NON-CONTACT FUSING Proposed Ronald A. Andrews Classification

U.S. C1. 355/3FU Int. CI. G03g 15/00

Flash fusing is perceived to be a significant opportunity in high volume products to achieve high reliability and low shutdown rates. It has the added benefit of no oil on copy to hinder typing on copies. This opportunity comes at a significant cost, however, in terms of manufacturing cost, size of the power supplies, sa&euroety concerns, air and heat removal requirements and effluent management. Flash fusers typically operate with a pulse width of one to a few milliseconds. In general, fusing efficiency tends to degrade slightly with longer pulse widths but the level of effluent drops dramatically due to lower peak toner temperatures. This makes for a difficult tradeoff between higher capacity effluent collectors/filters and the larger high voltage power supplies and system power.

Conventional flash fusing uses a pulsed light source that covers a wide area. In the fuser concept presented here, and referring to the drawing figure, the same effect can be produced by translating an image bearing copy sheet 5 passed a narrow aperture 6 of a continuous light source 7. The light source 7 is disposed in a highly reflective elliptical cavity 8 having a rotating quartz shield 9. A suitable cleaner 10 is provided to maintain the shield 9 free of dirt. A movable shutter 11 with driver 12 therefor is provided to close the aperture 6 when the system is not in use or in the event of failure or stopping of the copy sheet 5, motion detectors 13 being provided to sense stoppage of the copy sheet 5. In addition, suitable means would be provided to force cooling air through the cavity 8.

Volume 9 Number 1 January/February 1984 41

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HIGH SPEED NON-CONTACT FUSING (Cont'd)

An effect equivalent to pulse widths on the order of 10-20 msec. can be obtained by translating the copy sheet 5 at 25 to 30 inches/sec. passed an aperture 6 of
.25-.50 inches. The advantages achieved include use of a continuous light source
(i.e., tungsten) instead of a flash lamp; no high voltage power...