Patent US2368692A successfully refreshed from Google Patents.
Patent US4034186A successfully refreshed from Google Patents.
US4034186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement for preventing sheets from charring in copying machines
Assignee: Agfa Gevaert AG
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Filing: 1976-03-10
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Granted: 1977-07-05
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Expires: 1996-03-10
Abstract
Abstract In an electro-photographic copier of the type wherein an image is formed on an image-carrying sheet and is thereafter fixed by subjecting the sheet at a fixing station to the influence of heat, a combination comprises a heating device at the fixing station for fixing an image on a sheet, and a conveyor device for moving the heating device relative to a sheet located in the fixing station at a predetermined speed sufficient to permit the heating device to fix the image on the sheet and also to prevent charring of the latter. A sheet-advancing device advances a sheet through the fixing station in direction opposite to the direction of movement of the conveyor device so as to increase the relative speed between the heating device and the advancing sheet. The movement of the heating device relative to the sheet prevents charring or burning of the sheet in the event that the sheet-advancing device malfunctions and advances a sheet at speeds lower than its normally rated speed, including zero speed, i.e., complete breakdown.
Inventors
- 👤 Friedrich Bestenreiner
- 👤 Dieter Giglberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:45
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
In an electro-photographic copier of the type wherein an image is formed on an image-carrying sheet and is thereafter fixed by subjecting the sheet at a fixing station to the influence of heat, a combination comprising heating means at said station for fixing an image on a sheet; and means for moving said heating means relative to a sheet located in said station at a predetermined speed sufficient to permit said heating means to fix the image on the sheet and also to prevent charring of the latter.
Claim 2
Dependent Claim
88 words
In an electro-photographic copier of the type wherein an image is formed on an image-carrying sheet and is thereafter fixed by subjecting the sheet at a fixing station to the influence of heat, a combination comprising heating means at said station for fixing an image on a sheet; and means for moving said heating means relative to a sheet located in said station at a predetermined speed sufficient to permit said heating means to fix the image on the sheet and also to prevent charring of the latter.
Claim 3
Dependent Claim
51 words
A combination as defined in claim 1; and further comprising means for advancing a sheet through said station in one direction, and wherein said moving means moves said heating means in direction opposite to said one direction so as to increase the relative speed between said heating means and said sheet.
Claim 4
Dependent Claim
24 words
A combination as defined in claim 2, wherein said heating means is a radiating lamp elongated in direction substantially normal to said one direction.
Claim 5
Dependent Claim
69 words
A combination as defined in claim 1; and further comprising means for advancing a sheet through said station at rated speeds; and wherein said moving means moves said heating means through said station at said predetermined speed which is sufficient to prevent charring of the sheet in the event that the latter is advanced by said advancing means at speeds lower than said rated speeds, including substantially zero speed.
Claim 6
Dependent Claim
34 words
A combination as defined in claim 1; and further comprising means for advancing a sheet through said station; and further comprising actuating means for actuating said heating means when a sheet enters said station.
Claim 7
Dependent Claim
24 words
A combination as defined in claim 1; and further comprising means for automatically deactuating said heating means after a predetermined time interval has elapsed.
Claim 8
Dependent Claim
42 words
A combination as defined in claim 1, wherein said moving means comprises means for towing said heating means from an initial towards a final position, and also comprises means for returning said heating means from said final position towards said initial position.
Claim 9
Dependent Claim
32 words
A combination as defined in claim 7; and further comprising a guide rail mounted to the copier, and rollers connected with said heating means and mounted for movement on said guide rail.
Claim 10
Independent Claim
98 words
A method of protecting image-carrying sheets in an electro-photographic copier of the type wherein an image is formed on a sheet and is thereafter fixed by subjecting the latter at a fixing station to the influence of heat, comprising the steps of actuating a heating device which is operative for supplying image-fixing heat energy to a sheet located in said station; and moving said heating device relative to the sheet located in said station at a predetermined speed sufficient to permit the heating device to fix the image on the sheet and also prevent charring of the latter.
Claim 11
Independent Claim
98 words
A method of protecting image-carrying sheets in an electro-photographic copier of the type wherein an image is formed on a sheet and is thereafter fixed by subjecting the latter at a fixing station to the influence of heat, comprising the steps of actuating a heating device which is operative for supplying image-fixing heat energy to a sheet located in said station; and moving said heating device relative to the sheet located in said station at a predetermined speed sufficient to permit the heating device to fix the image on the sheet and also prevent charring of the latter.
Claim 12
Dependent Claim
44 words
A method as defined in claim 9; and further comprising the step of advancing a sheet through said station in one direction; and wherein said step of moving said heating device is performed by moving the latter in direction opposite to said one direction.
Claim 13
Dependent Claim
65 words
A method as defined in claim 9; and further comprising the step of advancing a sheet through said station at rated speeds, and wherein said step of moving said heating device is performed by moving the latter at said predetermined speed which is sufficient to prevent charring of the sheet in the event that the latter is advanced at speeds lower than said rated speeds.
Claim 14
Dependent Claim
62 words
A method as defined in claim 9; and further comprising the step of advancing a sheet through said station at rated speeds, and wherein said step of moving said heating device is performed by moving the latter at said predetermined speed which is sufficient to prevent charring of the sheet in the event that the latter is advanced at substantially zero speeds.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |