US3648658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing apparatus
Assignee: Xerox Corp
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Filing: 1969-09-15
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Granted: 1972-03-14
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Expires: 1989-09-15
Abstract
Abstract A development system wherein developer, comprising a mixture of toner particles and carrier beads, is cascaded over the surface of an insulating plate bearing a latent electrostatic image and the toner is attracted from the carrier to the plate to develop the latent image thereon having a device for supplying additional toner to the carrier beads in the development zone as the beads give up toner particles to the plate during the development process including a development electrode located adjacent the development zone having a plurality of apertures and a toner container that places additional toner particles in the apertures of the electrode.
Inventors
- 👤 Ernest A H Weiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0801; Y; Y10; Y10S; Y10S222/00; Y10S222/01
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
257 words
In an apparatus for developing a latent electrostatic image on the surface of an electrostatic plate including a development electrode parallel to the plate and spaced at a gap from the plate, means to activate the electrode at an appropriate voltage to enhance the deposition of toner particles on the plate in imagewise configuration, and means to cascade developer over the surface of the plate between the plate and the development electrode, the developer comprising carrier beads having toner particles attracted thereto due to triboelectrification between the carrier beads and toner particles whereby, as the developer cascades over the plate, toner particles are attracted away from the carrier beads and are deposited on the image areas of the plate to develop the latent image thereon resulting in the carrier beads becoming under-toned while still in the development zone, the improvement comprising apparatus to supply additional toner particles to under-toned carrier beads including: a. a plurality of apertures in the development electrode, the apertures being sufficiently large to enable the toner particles to pass therethrough; b. a toner container attached to the development electrode adjacent the surface of the development electrode opposite to the surface facing the plate, the container adapted to position toner particles contained therein adjacent to and in the apertures to the development electrode; and c. a quantity of toner particles in the toner container, the toner particles being attracted through the apertures in the development electrode to under-toned carrier beads as the carrier beads flow adjacent to and/or in contact with the development electrode.
Claim 2
Dependent Claim
257 words
In an apparatus for developing a latent electrostatic image on the surface of an electrostatic plate including a development electrode parallel to the plate and spaced at a gap from the plate, means to activate the electrode at an appropriate voltage to enhance the deposition of toner particles on the plate in imagewise configuration, and means to cascade developer over the surface of the plate between the plate and the development electrode, the developer comprising carrier beads having toner particles attracted thereto due to triboelectrification between the carrier beads and toner particles whereby, as the developer cascades over the plate, toner particles are attracted away from the carrier beads and are deposited on the image areas of the plate to develop the latent image thereon resulting in the carrier beads becoming under-toned while still in the development zone, the improvement comprising apparatus to supply additional toner particles to under-toned carrier beads including: a. a plurality of apertures in the development electrode, the apertures being sufficiently large to enable the toner particles to pass therethrough; b. a toner container attached to the development electrode adjacent the surface of the development electrode opposite to the surface facing the plate, the container adapted to position toner particles contained therein adjacent to and in the apertures to the development electrode; and c. a quantity of toner particles in the toner container, the toner particles being attracted through the apertures in the development electrode to under-toned carrier beads as the carrier beads flow adjacent to and/or in contact with the development electrode.
Claim 3
Dependent Claim
41 words
The apparatus in claim 1 further including agitator means adapted to maintain the toner particles in a loose consistency in the toner container whereby the toner particles pass freely through the apertures as they are attracted by the under-toned carrier beads.
Claim 4
Dependent Claim
13 words
The apparatus in claim 1 wherein the development electrode comprises a mesh material.
Claim 5
Dependent Claim
38 words
The apparatus in claim 3 further including, a coating of carrier bead material over the strands of the mesh electrode whereby the toner particles in the toner container acquire a triboelectric charge as they pass through the apertures.
Claim 6
Dependent Claim
217 words
In a sYstem for developing a latent image on an electrostatic plate by cascading developer across the plate in a development zone containing a development electrode, the developer comprising carrier beads having toner particles attracted thereto due to triboelectrification between the carrier beads and toner particles, whereby toner particles are attracted from the carrier beads and deposited on the plate by the electrostatic forces on the plate resulting in under-toned carrier beads in the development zone, the improvement comprising apparatus to supply additional toner particles to under-toned carrier beads including: a. a toner container adjacent to the development zone having one side thereof parallel to the surface of the plate and separated therefrom by a gap, the gap being sufficiently large to enable the cascading developer to flow freely across the plate while the one side remains in contact with the cascading developer; b. a plurality of relatively small apertures in the one side of the container sufficiently large to enable the toner particles in the container to pass through the one side; and c. a quantity of toner particles in the toner container, the toner particles being attracted through the apertures in the one side of the container to under-toned carrier beads as the carrier beads flow adjacent to and/or in contact with the development electrode.
Claim 7
Dependent Claim
217 words
In a sYstem for developing a latent image on an electrostatic plate by cascading developer across the plate in a development zone containing a development electrode, the developer comprising carrier beads having toner particles attracted thereto due to triboelectrification between the carrier beads and toner particles, whereby toner particles are attracted from the carrier beads and deposited on the plate by the electrostatic forces on the plate resulting in under-toned carrier beads in the development zone, the improvement comprising apparatus to supply additional toner particles to under-toned carrier beads including: a. a toner container adjacent to the development zone having one side thereof parallel to the surface of the plate and separated therefrom by a gap, the gap being sufficiently large to enable the cascading developer to flow freely across the plate while the one side remains in contact with the cascading developer; b. a plurality of relatively small apertures in the one side of the container sufficiently large to enable the toner particles in the container to pass through the one side; and c. a quantity of toner particles in the toner container, the toner particles being attracted through the apertures in the one side of the container to under-toned carrier beads as the carrier beads flow adjacent to and/or in contact with the development electrode.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |