US3685898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper flip control apparatus
Assignee: Xerox Corp
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Filing: 1971-12-08
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Granted: 1972-08-22
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Expires: 1991-12-08
Abstract
Abstract An improvement for apparatus for heat fixing a heat fusible image to a cut sheet of support material on which a xerographic powder image has been electrostatically transferred and wherein a charging device tacks the support material into thermal communication with a moving preheat roll for a predetermined period, and wherein another charging device of opposite polarity produces a pretacking condition of the moving preheat roll, a control circuit coupled to a guide baffle feeding the support sheet towards the preheat roll which control circuit includes a variable resistance for controlling a flow of charges to ground from the guide in order to minimize trail edge flip of the support material. The underside of the guide is coated with an electrically insulated material while the top side is electrically coupled to control circuit. The flow of electrical charges from the guide varies with the particular type of stock for the support material.
Inventors
- 👤 Ricardo A Gonzalez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:30
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007; Y; Y10; Y10S; Y10S271/00; Y10S271/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
In an apparatus for heat fixing a heat fusible image to a cut sheet of support material on which a xerographic powder image has been electrostatically transferred and wherein charging means tack the support material into thermal communication with a moving preheat means for a predetermined period of time and further, wherein other charging means of opposite polarity produce a pretacking condition on the moving preheat means the improvement comprising guide means made out of a conductive material for guiding the sheet material into contact with the preheat means and circuit means coupled to the guide means and ground and including an RC network for causing a flow of charges from the guide means to ground to control the electrical forces acting on the support material as it passes over the guide means into contact with the preheat means.
Claim 2
Dependent Claim
139 words
In an apparatus for heat fixing a heat fusible image to a cut sheet of support material on which a xerographic powder image has been electrostatically transferred and wherein charging means tack the support material into thermal communication with a moving preheat means for a predetermined period of time and further, wherein other charging means of opposite polarity produce a pretacking condition on the moving preheat means the improvement comprising guide means made out of a conductive material for guiding the sheet material into contact with the preheat means and circuit means coupled to the guide means and ground and including an RC network for causing a flow of charges from the guide means to ground to control the electrical forces acting on the support material as it passes over the guide means into contact with the preheat means.
Claim 3
Dependent Claim
13 words
Apparatus according to claim 1 wherein the RC network includes a variable resistance.
Claim 4
Dependent Claim
24 words
Apparatus according to claim 2 wherein the side of the guide means not in contact with the support material has an electrically insulating coating.
Claim 5
Dependent Claim
115 words
Improved apparatus for transporting paper sheet material comprising first transport means for conveying paper sheet material along a predetermined path, baffle means interposed in the sheet path for changing the direction of the paper sheet material, said baffle means having a conductive surface for contacting the paper sheet material and an electrically insulating surface, tacking corotron means positioned adjacent the baffle means for producing charges on the baffle means and paper sheet material for tacking the paper sheet material to the baffle means, and circuit means coupled to the baffle means and ground and incLuding an RC network having a variable resistance for selectively controlling the flow of charges from the baffle means to ground.
Claim 6
Dependent Claim
115 words
Improved apparatus for transporting paper sheet material comprising first transport means for conveying paper sheet material along a predetermined path, baffle means interposed in the sheet path for changing the direction of the paper sheet material, said baffle means having a conductive surface for contacting the paper sheet material and an electrically insulating surface, tacking corotron means positioned adjacent the baffle means for producing charges on the baffle means and paper sheet material for tacking the paper sheet material to the baffle means, and circuit means coupled to the baffle means and ground and incLuding an RC network having a variable resistance for selectively controlling the flow of charges from the baffle means to ground.
References Cited (Backward Citations)
US3519253A
Cited
US3508824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |