US3632370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple brush development
Assignee: Xerox Corp
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Filing: 1970-03-20
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Granted: 1972-01-04
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Expires: 1990-03-20
Abstract
Abstract Two or more brushes are placed adjacent to and in mesh with each other and a surface bearing a latent electrostatic image to form a high-speed development system. Adjacent development brushes in the system are rotated at different speeds relative to one another to create a swirling motion during development. The primary brush in the system is the brush which initially contacts the latent image as it passes the development area and is, preferably, the only brush in the system which is loaded with toner by external means, the other brushes in the system receiving toner as a result of their meshing one with another.
Inventors
- 👤 Ernest A Weller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:24
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0805
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
140 words
In a development apparatus for applying electrically charged toner particles to a moving surface bearing a latent electrostatic image comprising a primary rotatable brush adapted to initially contact the image and at least one secondary rotatable brush wherein the brushes contact the surface for applying toner particles thereon, and wherein the bristles of the secondary brush are in interference with the bristles of the primary brush, means for imparting rotative peripheral movement to the primary brush and means for loading the outer periphery of the primary brush with toner particles, the improvement comprising, means for imparting rotative peripheral movement to the secondary brush and at a speed different than the speed of the rotative movement of the first brush, said rotative movement of the secondary brush being in a direction opposite that of the rotative movement of the primary brush.
Claim 2
Dependent Claim
46 words
The apparatus of claim 1 wherein the speed of said rotative movement of the primary brush is greater than the speed of movement of the surface and the speed of rotative movement of the secondary brush is less than the speed of movement of the surface.
Claim 3
Dependent Claim
138 words
In a method of developing a surface bearing a latent electrostatic charge pattern with charged toner particles which comprises the steps of contacting at least two brushes having their bristles in interferring relationship, one being a primary brush arranged to initially contact the pattern and the other being a secondary brush, loading the primary brush with toner particles, moving the surface relative to and in interference with the brushes whereby the first brush to contact the pattern is the primary brush, simultaneously oscillating the brushes in a plane parallel to the plane of the surface and perpendicular to the movement of the surface, the improvement comprising: IMPARTING rotative peripheral movement to each of said brushes and at speeds wherein the rotative movement of said primary brush is different than the speed of rotative movement for the secondary brush.
References Cited (Backward Citations)
CA611794A
Cited
US3103445A
Cited
US2751616A
Cited
US3318284A
Cited
US3296965A
Cited
US3357402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |