US3894513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copying machine with bead pickoff roller
Assignee: Xerox Corp
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Filing: 1972-12-06
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Granted: 1975-07-15
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Expires: 1992-12-06
Abstract
Abstract An electrostatic copying machine of the type having a moving photoconductive surface defined by an endless belt, and a development system such as a magnetic brush assembly for supplying toner particles to the surface, has a pickoff roller rotatably mounted adjacent the surface for removing any magnetic carrier beads which may have become attached to the surface at the development zone. The roller is non-magnetic, and has a magnet and a magnetic pole piece arranged therein for creating a magnetic field which attracts the beads to the roller and which is necessary to hold them on the roller so as to be conveyed away from said surface by said roller until reaching a location where the field decreases sufficiently to allow the beads at that location to descend via gravity into a receptacle where they can be collected for reuse.
Inventors
- 👤 Michael R Stanley
- 👤 Salvatore Latone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G21/00; G03G21/0005; G03G21/0047
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
190 words
The combination of a copying machine having a flexible belt mounted for movement around a closed path and defining a photoconductive surface, means for supporting a portion of said flexible belt as it moves around said closed path, and means including magnetic carrier beads for applying toner to said surface at a first location along said closed path, with means located immediately adjacent to said supported section for removing any of said carrier beads which may have become attached to said surface at said first location, said removing means comprising: a non-magnetic cylindrical pickoff roller mounted for rotation about its axis adjacent said surface, the peripheral surface of said pickoff roller being rough finished, a receptacle disposed beneath said pickoff roller, and means disposed within said pickoff roller for creating a magnetic field to attract said carrier beads from said surface to said pickoff roller and to hold said beads on said pickoff roller so as to be conveyed along a course away from said surface until said beads reach a location where the field decreases sufficiently to permit beads at said location to descend via gravity into said receptacle.
Claim 2
Dependent Claim
190 words
The combination of a copying machine having a flexible belt mounted for movement around a closed path and defining a photoconductive surface, means for supporting a portion of said flexible belt as it moves around said closed path, and means including magnetic carrier beads for applying toner to said surface at a first location along said closed path, with means located immediately adjacent to said supported section for removing any of said carrier beads which may have become attached to said surface at said first location, said removing means comprising: a non-magnetic cylindrical pickoff roller mounted for rotation about its axis adjacent said surface, the peripheral surface of said pickoff roller being rough finished, a receptacle disposed beneath said pickoff roller, and means disposed within said pickoff roller for creating a magnetic field to attract said carrier beads from said surface to said pickoff roller and to hold said beads on said pickoff roller so as to be conveyed along a course away from said surface until said beads reach a location where the field decreases sufficiently to permit beads at said location to descend via gravity into said receptacle.
Claim 3
Dependent Claim
49 words
The combination according to claim 1, wherein said means for applying said toner comprises a magnetic brush assembly having a plurality magnetic brush rollers mounted for rotation about their axes adjacent said belt, said axes lying in a plane which is at least substantially parallel to said straight portion.
References Cited (Backward Citations)
US3574301A
Cited
US3642364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |