Patent US3719452A successfully refreshed from Google Patents.
US5350896A
Expired / Lapsed
US
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Dual lamp fuser
Assignee: Xerox Corp
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Filing: 1993-11-22
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Granted: 1994-09-27
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Expires: 2013-11-22
Abstract
Abstract A heat and pressure fuser for fixing toner images to substrates. A dual heating lamp arrangement is utilized for elevating the surface temperature of a heated fuser roll. The operation of the dual heat lamps is controlled using dual thermistors for maintain steady state temperature fluctuations to ±3° F. The thermistors are positioned, one adjacent the inboard end of the fuse and the other adjacent the outboard end thereof. The outboard thermistor is used to determine the desired on time of the fuser lamp and the inboard thermistor is used to determine which of the two lamps is on. If the inboard temperature is below a predetermined target value a 14 inch lamp is turned on. If the inboard temperature is at or above a predetermined target value an 11 inch lamp is turned.
Inventors
- 👤 Mark S. Amico
- 👤 Mark A. Scheuer
- 👤 Irwin Wagman
- 👤 Dale E. Seeley
- 👤 David M. Thompson
- 👤 Dawn M. Kelsch
- 👤 Wayne D. Drinkwater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:33
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2025; G03G15/2039; G03G15/205
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
114 words
A method of controlling the surface temperature of a heated fuser member having a plurality of heating elements operatively supported internally thereof, said method including the steps of: heating said heated fuser member using two heating elements supported internally thereof; energizing only one of said heating elements at a time for elevating the surface temperature of said fuser member to a predetermined temperature; measuring the surface temperature of said heated fuser roll at two locations; and using the temperature measured at one of said two locations to determine which heating element is energized and using the temperature measured at the other of said two locations to control the operation of the heating element energized.
Claim 2
Independent Claim
114 words
A method of controlling the surface temperature of a heated fuser member having a plurality of heating elements operatively supported internally thereof, said method including the steps of: heating said heated fuser member using two heating elements supported internally thereof; energizing only one of said heating elements at a time for elevating the surface temperature of said fuser member to a predetermined temperature; measuring the surface temperature of said heated fuser roll at two locations; and using the temperature measured at one of said two locations to determine which heating element is energized and using the temperature measured at the other of said two locations to control the operation of the heating element energized.
Claim 3
Dependent Claim
38 words
The method according to claim 1 wherein said step of measuring comprises using temperature sensing means for generating first and second signals representative of the surface temperature of said fuser member adjacent the outboard and inboard ends thereof.
Claim 4
Dependent Claim
26 words
The method according to claim 2 wherein said step of heating comprises using a first heating element adapted to uniformly dissipate energy over its entire length.
Claim 5
Dependent Claim
26 words
The method according to claim 3 wherein said step of heating further comprises using a second heating element adapted to differentially dissipate energy over its length.
Claim 6
Dependent Claim
15 words
The method according to claim 4 wherein said step of measuring comprises using two thermistors.
Claim 7
Dependent Claim
25 words
The method according to claim 4 further including the step of generating first and second signals representative of the temperatures measured at said two locations.
Claim 8
Dependent Claim
59 words
The method according to claim 6 further including the step of comparing one of said first and second signals to a reference value and energizing one of said heating elements when said one of said signals is above said reference value and the other of said heating elements when said one of said signals is below said reference value.
Claim 9
Dependent Claim
60 words
The method according to claim 7 including the step of comparing the other of said signals to another reference value and inhibiting energization of said heating elements when said other of said signals is above said another reference value and allowing energization of one of said heating elements when said other of said signals is below said another reference value.
Claim 10
Dependent Claim
24 words
The method according to claim 6 wherein said two locations are adjacent an inboard end of said fuser member and an outboard end thereof.
Claim 11
Dependent Claim
33 words
The method according to claim 9 wherein said step of using a second heating element comprises heating said fuser member at a greater rate adjacent said outboard end than adjacent its inboard end.
Claim 12
Dependent Claim
174 words
Heat and pressure fuser apparatus comprising: a fuser roll; a plurality of heating elements disposed internally of said fuser roll for elevating the surface temperature of said fuser roll to a fusing temperature; a pressure roll cooperating with said fuser roll to form a nip through which copy substrates carrying toner images pass with said toner images contacting said fuser roll, said rolls having inboard and outboard ends; means for sensing the surface temperature of said fuser roll adjacent said inboard and outboard ends; means for energizing only one of said heating elements at a time for elevating the surface temperature of said fuser member to a said fusing temperature; means for measuring the surface temperature of said heated fuser roll at two locations; and means responsive to one to the measurement of said surface temperature at one of said locations for energizing one or the other of said heating elements means responsive to the measurement of the temperature at the other of said locations for controlling the operation of the heating element energized.
Claim 13
Dependent Claim
174 words
Heat and pressure fuser apparatus comprising: a fuser roll; a plurality of heating elements disposed internally of said fuser roll for elevating the surface temperature of said fuser roll to a fusing temperature; a pressure roll cooperating with said fuser roll to form a nip through which copy substrates carrying toner images pass with said toner images contacting said fuser roll, said rolls having inboard and outboard ends; means for sensing the surface temperature of said fuser roll adjacent said inboard and outboard ends; means for energizing only one of said heating elements at a time for elevating the surface temperature of said fuser member to a said fusing temperature; means for measuring the surface temperature of said heated fuser roll at two locations; and means responsive to one to the measurement of said surface temperature at one of said locations for energizing one or the other of said heating elements means responsive to the measurement of the temperature at the other of said locations for controlling the operation of the heating element energized.
Claim 14
Dependent Claim
36 words
Apparatus according to claim 11 wherein said means for measuring comprises temperature sensing means for generating first and second signals representative of the surface temperature of said fuser member adjacent the outboard and inboard ends thereof.
Claim 15
Dependent Claim
23 words
Apparatus according to claim 12 wherein means for elevating comprises a first heating element adapted to uniformly dissipate energy over its entire length.
Claim 16
Dependent Claim
22 words
Apparatus according to claim 13 wherein for elevating further comprises a second heating element adapted to differentially dissipate energy over its length.
Claim 17
Dependent Claim
13 words
Apparatus according to claim 14 wherein said means for measuring comprises two thermistors.
Claim 18
Dependent Claim
23 words
Apparatus according to claim 15 further including means for generating first and second signals representative of the temperatures measured at said two locations.
Claim 19
Dependent Claim
58 words
Apparatus according to claim 16 further including means for comparing one of said first and second signals to a reference value and for energizing one of said heating elements when said one of said signals is above said reference value and the other of said heating elements when said one of said signals is below said reference value.
Claim 20
Dependent Claim
58 words
Apparatus according to claim 17 including means for comparing the other of said signals to another reference value and inhibiting energization of said heating elements when said other of said signals is above said another reference value and allowing energization of one of said heating elements when said other of said signals is below said another reference value.
Claim 21
Dependent Claim
23 words
Apparatus according to claim 16 wherein said two locations are adjacent an inboard end of said fuser member and an outboard end thereof.
Claim 22
Dependent Claim
29 words
Apparatus according to claim 19 wherein second heating element comprises means for heating said fuser member at a greater rate adjacent said outboard end than adjacent its inboard end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-09-26 | 1998-03-28 | 1998-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-26 | 2002-03-28 | 2002-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-26 | 2006-03-28 | 2006-09-27 | $7700.00 | Window Closed / Lapsed |