US3702482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bias roll transfer
Assignee: Xerox Corp
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Filing: 1970-12-23
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Granted: 1972-11-07
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Expires: 1990-12-23
Abstract
Abstract A biasable transfer member is herein disclosed suitable for use in transferring xerographic images from a photoconductor to a final support sheet. The member is adapted to electrically cooperate with the photoconductor to establish a directional force field therebetween capable of attracting toner from the photoconductor toward the member and features a structure which provides for a more efficient transfer operation while at the same time accurately matching the speed of the support sheet to the photoconductor.
Inventors
- 👤 Charles Dolcimascolo
- 👤 Daniel S Hoffman
- 👤 Hugh L Jones
- 👤 James E Mercik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:20
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167; G03G15/1685; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A transfer member for electrically cooperating with a conductive support surface to electrically attract charge particles from the support surface towards the member including a conductive substrate for supporting a uniform bias potential thereon, an intermediate resilient blanket placed in contact with said substrate having an electrical resistivity such that the blanket is capable of transmitting said bias potential on said substrate to the outer periphery of said blanket, and an outer coating placed over said blanket having an electrical resistivity to minimize ionization of the surrounding atmosphere when said transfer member is placed in electrical cooperation with said support surface.
Claim 2
Dependent Claim
101 words
A transfer member for electrically cooperating with a conductive support surface to electrically attract charge particles from the support surface towards the member including a conductive substrate for supporting a uniform bias potential thereon, an intermediate resilient blanket placed in contact with said substrate having an electrical resistivity such that the blanket is capable of transmitting said bias potential on said substrate to the outer periphery of said blanket, and an outer coating placed over said blanket having an electrical resistivity to minimize ionization of the surrounding atmosphere when said transfer member is placed in electrical cooperation with said support surface.
Claim 3
Dependent Claim
26 words
The transfer member of claim 1 wherein said intermediate blanket is formed of an elastomeric material having a resistivity of between 109 and 1010 ohms cm.
Claim 4
Dependent Claim
26 words
The transfer member of claim 2 wherein said outer coating is formed of an elastomeric material having a resistivity of between 1013 and 1015 ohms cm.
Claim 5
Dependent Claim
22 words
The transfer member of claim 3 wherein said substrate is formed of a conductive metal in the shape of an endless belt.
Claim 6
Dependent Claim
124 words
A transfer roll for electrically cooperating with a photoconductive plate when brought into contact therewith to attract charged toner particles from the plate toward the roll including a rigid cylindrical core or electrically conductive material, means to connect said core to a biasing source whereby a uniform biasing potential is placed upon said core, a resilient intermediate blanket placed over said core, in contact therewith, having an electrical resistivity such that the blanket is capable of transmitting said bias potential from said conductive core to the outer periphery of said blanket, an outer resilient coating Placed over said blanket having a resistivity to minimize ionization of the surrounding atmosphere in and about the zone of contact between the transfer roll and the photoconductive plate.
Claim 7
Dependent Claim
124 words
A transfer roll for electrically cooperating with a photoconductive plate when brought into contact therewith to attract charged toner particles from the plate toward the roll including a rigid cylindrical core or electrically conductive material, means to connect said core to a biasing source whereby a uniform biasing potential is placed upon said core, a resilient intermediate blanket placed over said core, in contact therewith, having an electrical resistivity such that the blanket is capable of transmitting said bias potential from said conductive core to the outer periphery of said blanket, an outer resilient coating Placed over said blanket having a resistivity to minimize ionization of the surrounding atmosphere in and about the zone of contact between the transfer roll and the photoconductive plate.
Claim 8
Dependent Claim
26 words
The transfer roll of claim 5 wherein said intermediate blanket is formed of a polyurethane material having a resistivity of between 109 and 1010 ohms cm.
Claim 9
Dependent Claim
26 words
The transfer roll of claim 6 wherein said outer coating is formed of a polyurethane material having a resistivity of between 1013 and 1015 ohms cm.
Claim 10
Dependent Claim
20 words
The transfer roll of claim 7 further including dielectric end caps for rotatably supporting and electrically isolating said transfer roll.
Claim 11
Dependent Claim
26 words
The apparatus of claim 8 further including sheet gripping means to secure a sheet of final support material to the outer surface of said transfer roll.
Claim 12
Dependent Claim
20 words
The apparatus of claim 7 wherein said intermediate blanket has a hardness of between 15 and 25 durometers, Shore A.
Claim 13
Dependent Claim
20 words
The apparatus of claim 10 wherein said outer coating has a hardness of between 65 and 75 durometers, Shore D.
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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |