US3901186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer roller assembly
Assignee: Xerox Corp
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Filing: 1973-07-02
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Granted: 1975-08-26
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Expires: 1993-07-02
Abstract
Abstract A transfer roller assembly having a transfer roller, is mounted adjacent a curved photoconductive surface of an electrostatographic machine so that the transfer roller is biased into contact with the surface with a minimal force sufficient only to maintain uniform contact therewith during machine operation; the roller is mounted so that it may move in a direction which is at least generally perpendicular to a tangent at the point of contact. The ratio of the radius of the photoconductive surface to that of the roller at the point of contact is not less than 3, and preferably in the range of 3 to 3.5.
Inventors
- 👤 Daniel S Hoffman
- 👤 John Maksymiak
- 👤 Frank S Sanza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:55
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
196 words
Apparatus comprising: a. means defining a surface adapted to support a developed electrostatic image, the surface being mounted for movement around a closed path; b. a transfer roller assembly having a transfer roller in contact with the surface, wherein the ratio of (i) the distance from the surface at the point of contact to the center of curvature of the surface at that point to (ii) the radial dimension of the roller, is not less than 3; c. means for mounting the transfer roller so that it may move in a direction which is at least generally perpendicular to a tangent at the point of contact between the surface and the roller; d. means for feeding a support sheet between the surface and the roller; and e. means for biasing the roller against the support sheet with a minimal force which is sufficient only to keep the roller in contact with the support sheet and the support sheet in contact with the surface during movement of the support sheet between the surface and the rollers during operation of the apparatus so that transfer can be effected solely by an electrical bias applied to the transfer roller.
Claim 2
Dependent Claim
196 words
Apparatus comprising: a. means defining a surface adapted to support a developed electrostatic image, the surface being mounted for movement around a closed path; b. a transfer roller assembly having a transfer roller in contact with the surface, wherein the ratio of (i) the distance from the surface at the point of contact to the center of curvature of the surface at that point to (ii) the radial dimension of the roller, is not less than 3; c. means for mounting the transfer roller so that it may move in a direction which is at least generally perpendicular to a tangent at the point of contact between the surface and the roller; d. means for feeding a support sheet between the surface and the roller; and e. means for biasing the roller against the support sheet with a minimal force which is sufficient only to keep the roller in contact with the support sheet and the support sheet in contact with the surface during movement of the support sheet between the surface and the rollers during operation of the apparatus so that transfer can be effected solely by an electrical bias applied to the transfer roller.
Claim 3
Dependent Claim
22 words
Apparatus as set forth in claim 1 wherein the ratio of (i) to (ii) is in the range of 3 to 3.5.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |