US3840879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excess toner shield for electrographic apparatus
Assignee: Xerox Corp
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Filing: 1973-01-29
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Granted: 1974-10-08
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Expires: 1993-01-29
Abstract
Abstract An excess toner shield for use in an electrographic apparatus which includes a writing stylus movable back and forth across a recording medium. The stylus projects through an opening intermediate the developer housing and the recording paper with the opening being substantially closed by a fiber brush through which the stylus moves. A urethane foam strip having a slit thereacross through which the stylus projects may also be employed to prevent excess toner from passing through the opening between the developer housing and the recording paper.
Inventors
- 👤 J Catabrette
- 👤 M Beckman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0805
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
Apparatus comprising a platen on which is moved a recording medium, a container for housing developer particles, a stylus assembly projecting intermediate said container and said recording medium to a position adjacent said recording medium, means for moving said stylus widthwise of said recording medium, a developer brush for depositing developer particles on said charged medium immediately after each character is imprinted thereon by said stylus, the fibers of said brush contacting said stylus during rotation thereof, a donor roller located in part in said container and in contact with both said development particles and said development brush, and a fibrous element substantially spanning the opening between said container and said medium, said stylus projecting through the fibers of said element, said element substantially blocking the passage of developer material through said opening to other parts of the apparatus while permitting movement of said stylus widthwise of said media.
Claim 2
Dependent Claim
149 words
Apparatus comprising a platen on which is moved a recording medium, a container for housing developer particles, a stylus assembly projecting intermediate said container and said recording medium to a position adjacent said recording medium, means for moving said stylus widthwise of said recording medium, a developer brush for depositing developer particles on said charged medium immediately after each character is imprinted thereon by said stylus, the fibers of said brush contacting said stylus during rotation thereof, a donor roller located in part in said container and in contact with both said development particles and said development brush, and a fibrous element substantially spanning the opening between said container and said medium, said stylus projecting through the fibers of said element, said element substantially blocking the passage of developer material through said opening to other parts of the apparatus while permitting movement of said stylus widthwise of said media.
Claim 3
Dependent Claim
13 words
The combination reciteD in claim 1 wherein said element is a natural fur.
Claim 4
Dependent Claim
137 words
An electrographic machine comprising a writing stylus movable widthwise of a recording medium, said writing stylus having a writing head and a body portion, a developer housing containing developer material and defining in combination with said medium an opening through which said stylus projects to a position adjacent said medium, a developer brush mounted above said opening for depositing developer particles on said medium immediately after each character is imprinted thereon by said stylus, the fibers of said brush contacting said writing head during rotation thereof, and a resilient member spanning substantially said entire opening, said stylus extending through said member, said member maintaining loose contact with said body portion of said stylus and blocking the passage of excess development material through said opening to other parts of the machine while permitting widthwise movement of said stylus.
Claim 5
Dependent Claim
137 words
An electrographic machine comprising a writing stylus movable widthwise of a recording medium, said writing stylus having a writing head and a body portion, a developer housing containing developer material and defining in combination with said medium an opening through which said stylus projects to a position adjacent said medium, a developer brush mounted above said opening for depositing developer particles on said medium immediately after each character is imprinted thereon by said stylus, the fibers of said brush contacting said writing head during rotation thereof, and a resilient member spanning substantially said entire opening, said stylus extending through said member, said member maintaining loose contact with said body portion of said stylus and blocking the passage of excess development material through said opening to other parts of the machine while permitting widthwise movement of said stylus.
Claim 6
Dependent Claim
13 words
The combination recited in claim 3 wherein said member comprises a natural fur.
Claim 7
Dependent Claim
14 words
The combination recited in claim 3 wherein said member comprises a synthetic plastic foam.
Claim 8
Dependent Claim
20 words
The combination recited in claim 5 wherein said foam includes a slit widthwise thereacross, said stylus projecting through said slit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |