US4205220A
Expired / Lapsed
US
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Electrographic fusing apparatus and method
Assignee: Eastman Kodak Co
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Filing: 1974-07-29
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Granted: 1980-05-27
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Expires: 1994-07-29
Abstract
Abstract Loose toner particles carried by a flexible support are fused thereto by cylindrically curling the support about the longitudinal axis of a flashlamp, and momentarily energizing the flashlamp while the toner-bearing support is curled thereabout. A transport mechanism, adapted for use in a high-speed recording apparatus, advances a toner-bearing sheet along a circular path such that the toner-bearing surface of the sheet is untouched and continuously faces toward the center of curvature of the path.
Inventors
- 👤 Robert J. O'Brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:39
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007; G03G15/201
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
An improved flash fusing apparatus for fusing toner images onto a copy sheet comprising: an elongated flashlamp, a cylindrically shaped member circling said flashlamp along the longitudinal axis thereof, and means for positioning a copy sheet bearing toner images along the cylindrical member to form a circular path around said flashlamp whereupon energizing said lamp uniform direct radiation is imparted to the sheet to fuse the toner particles at a reduced power output.
Claim 2
Dependent Claim
73 words
An improved flash fusing apparatus for fusing toner images onto a copy sheet comprising: an elongated flashlamp, a cylindrically shaped member circling said flashlamp along the longitudinal axis thereof, and means for positioning a copy sheet bearing toner images along the cylindrical member to form a circular path around said flashlamp whereupon energizing said lamp uniform direct radiation is imparted to the sheet to fuse the toner particles at a reduced power output.
Claim 3
Dependent Claim
23 words
Apparatus according to claim 1 including sensing means for detecting the lead edge of sheet to provide a signal to energize the flashlamp.
Claim 4
Dependent Claim
36 words
The invention according to claim 1 wherein said flashlamp comprises a xenon flashlamp having a pulse width of between 0.25 and 1.5 milliseconds and operating at an input power level of between 600 and 800 joules.
Claim 5
Dependent Claim
46 words
The invention according to claim 1 wherein said positioning means includes an endless web composed of a dielectric material, means for imparting an electrostatic charge to said web to render said web attractive to such a sheet and means for advancing said web around said flashlamp.
Claim 6
Dependent Claim
70 words
The invention defined in claim 1 wherein said flashlamp is adapted to emit a pulse of high intensity radiant energy comprised primarily of wavelengths that are substantially reflected by a paper copy sheet positioned by said positioning means and substantially absorbed by such toner images on that sheet whereby radiant energy from said flashlamp will be reflected by non-image bearing portions of such sheet toward other portions of such sheet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-27 | 1983-11-26 | 1984-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-27 | 1987-11-26 | 1988-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-27 | 1991-11-26 | 1992-05-27 | $7700.00 | Window Closed / Lapsed |