US6353718B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic fusing apparatus with multiple heating elements
Assignee: Xerox Corp
•
Filing: 2000-11-17
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Granted: 2002-03-05
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Expires: 2020-11-17
Abstract
Abstract A fusing apparatus for xerographic printing includes a fuser roll with two parallel lamps, or heating elements, therein. Each lamp defines a relatively hot end and a relatively cold end when electrical power is applied. The two lamps are disposed so that a hot end of one lamp is adjacent to the cold end of the other lamp. At power-up, power is applied to each lamp in a stair-step fashion, in which incremental increases in applied power for each lamp are staggered in time. Also during power-up, the lamps are connected in series, but the series connection is removed for a running condition. These features contribute to desirable anti-flicker effects of the whole apparatus.
Inventors
- 👤 John Roxon
- 👤 Ian Pitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:42
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2039; G03G15/2042
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A fusing apparatus for use in xerographic printing, comprising: a first heating element and a second heating element, each of the first heating element and the second heating element having a relatively hot portion and a relatively cold portion; the relatively hot portion of each heating element being defined by a major portion of heat-producing material, the major portion of heat-producing material extending for greater than one-half of a main length of the heating element; the first heating element and the second heating element being arranged whereby the relatively hot portion of the first heating element is adjacent the relatively cold portion of the second heating element; and the major portion of heat-producing material in the first heating element partially overlapping the major portion of heat-producing material in the second heating element along the main lengths of the heating elements.
Claim 2
Dependent Claim
140 words
A fusing apparatus for use in xerographic printing, comprising: a first heating element and a second heating element, each of the first heating element and the second heating element having a relatively hot portion and a relatively cold portion; the relatively hot portion of each heating element being defined by a major portion of heat-producing material, the major portion of heat-producing material extending for greater than one-half of a main length of the heating element; the first heating element and the second heating element being arranged whereby the relatively hot portion of the first heating element is adjacent the relatively cold portion of the second heating element; and the major portion of heat-producing material in the first heating element partially overlapping the major portion of heat-producing material in the second heating element along the main lengths of the heating elements.
Claim 3
Dependent Claim
43 words
The apparatus of claim 1 , the first heating element and the second heating element each defining a main length thereof, and disposed so that the main length is substantially perpendicular to a process direction of a substrate passing through the fusing apparatus.
Claim 4
Dependent Claim
27 words
The apparatus of claim 1 , further comprising a fuser roll, and the first heating element and the second heating element being arranged inside the fuser roll.
Claim 5
Dependent Claim
29 words
The apparatus of claim 1 , wherein, for at least one heating element, the relatively hot portion has a higher distribution of heat-producing material than the relatively cold portion.
Claim 6
Dependent Claim
24 words
The apparatus of claim 1 , wherein the first heating element and the second heating element have substantially identical configurations of heat producing material.
Claim 7
Dependent Claim
33 words
The apparatus of claim 1 , each heating element including a major portion of heat-producing material disposed toward one end of the heating element, and at least one smaller portion of heat-producing material.
Claim 8
Dependent Claim
26 words
The apparatus of claim 6 , the major portion of heat-producing material and the at least one smaller portion of heat-producing material being connected in series.
Claim 9
Dependent Claim
22 words
The apparatus of claim 1 , further comprising means for selectably energizing the first heating element and not the second heating element.
References Cited (Backward Citations)
US4001545A
Cited
US4075455A
Cited
US4309591A
Cited
US4297562A
Cited
US4301359A
Cited
US4585325A
Cited
US4801968A
Cited
US4825242A
Cited
EP0361562A1
Cited
US5355203A
Cited
US5300996A
Cited
US5497218A
Cited
US5819134A
Cited
US5904871A
Cited
US5826152A
Cited
US6008829A
Cited
US5899599A
Cited
US5862436A
Cited
EP0962837A2
Cited
US6011939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-03-04 | 2005-09-03 | 2006-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-03-04 | 2009-09-03 | 2010-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-03-04 | 2013-09-03 | 2014-03-05 | $7700.00 | Window Closed / Lapsed |