US3848994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line charge toner cleaning
Assignee: Xerox Corp
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Filing: 1973-10-29
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Granted: 1974-11-19
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Expires: 1993-10-29
Abstract
Abstract An electrostatographic system in which dry imaging material (toner) is cleaned from a photoreceptor surface by a soft cleaning member, and the cleaning member in turn is electrostatically cleaned by a secondary or pickoff roller having a multiplicity of closely adjacent and differently charged conductors, which attract toner particles of either polarity and also uncharged toner. This electrical charge pattern may be provided by differentially biasing a bifilar helical conductive winding on an insulative surface of the secondary roller.
Inventors
- 👤 L Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:26
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/10; G03G21/0005; G03G21/0035
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
In electrostatographic apparatus in which electrostatically attractable imaging material is cleaned from an imaging surface, the improvement comprising: a moving surface cleaning member making a cleaning engagement with said imaging surface for removing said imaging material from said imaging surface; a moving surface pick-off member making a cleaning engagement with said cleaning member for removing said imaging material from said surface of said cleaning member to said surface of said pick-off member; electrostatic field means for generating a multiplicity of closely adjacent differently charged areas on said pick-off member in said engagement with said cleaning member for producing a plurality of non-uniform imaging material attractive electrical fringe fields between said pick-off member and said cleaning member; and imaging material removal means for removing said imaging material from said pick-off member.
Claim 2
Dependent Claim
130 words
In electrostatographic apparatus in which electrostatically attractable imaging material is cleaned from an imaging surface, the improvement comprising: a moving surface cleaning member making a cleaning engagement with said imaging surface for removing said imaging material from said imaging surface; a moving surface pick-off member making a cleaning engagement with said cleaning member for removing said imaging material from said surface of said cleaning member to said surface of said pick-off member; electrostatic field means for generating a multiplicity of closely adjacent differently charged areas on said pick-off member in said engagement with said cleaning member for producing a plurality of non-uniform imaging material attractive electrical fringe fields between said pick-off member and said cleaning member; and imaging material removal means for removing said imaging material from said pick-off member.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 wherein said cleaning member is a cylindrical rotating cleaning brush and said pickoff member is a rigid cylindrical roller.
Claim 4
Dependent Claim
25 words
The apparatus of claim 1 wherein said cleaning member comprises a foraminous surfaced cylindrical roller deformably engaging both said imaging surface and said pickoff member.
Claim 5
Dependent Claim
20 words
The apparatus of claim 3 wherein said pickoff member is a rigid cylindrical roller having an substantially electrically insulative surface.
Claim 6
Dependent Claim
37 words
The apparatus of claim 4 wherein said electrostatic field means comprises a plurality of closely spaced conduCtive elements on said insulative surface of said pickoff member and electrical biasing means for differently electrically biasing said conductive elements.
Claim 7
Dependent Claim
47 words
The apparatus of claim 5 wherein said electrical biasing means applies substantially different electrical potentials to adjacent said conductive elements to create a plurality of non-uniform electrostatic fields between said plurality of adjacent conductive elements attractive to all of said imaging material including electrically uncharged imaging material.
Claim 8
Dependent Claim
16 words
The apparatus of claim 5 wherein said conductive elements are thinly covered by said insulative surface.
Claim 9
Dependent Claim
21 words
The apparatus of claim 5 wherein said conductive elements comprise a two conductor bifilar helical winding pattern on said pickoff member.
Claim 10
Dependent Claim
37 words
The apparatus of claim 8 wherein said electrical biasing means comprises a positive voltage source connected to one conductor of said bifilar winding and a negative voltage source connected to the other conductor of said bifilar winding.
References Cited (Backward Citations)
US3523319A
Cited
US3780391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |