US4302094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development method and apparatus
Assignee: Xerox Corp
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Filing: 1980-03-31
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Granted: 1981-11-24
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Expires: 2000-03-31
Abstract
Abstract In the development of xerographic images wherein the latent image is in the form of a periodic charge pattern, polar or polarizable toner particles are employed. It is desirable to utilize a development system that will bring the polar or polarizable toner into contact with the periodic charge pattern without triboelectrically charging the particles. To achieve this aim, an apparatus and method are described for moving the polar or polarizable toner particles through a development zone at substantially the same speed and in the same direction as that of the imaging member.
Inventors
- 👤 Robert W. Gundlach
- 👤 Richard F. Bergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:18
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
108 words
A method of developing a latent electrostatic nonuniform charge pattern on an imaging member with polar or polarizable toner particles which comprises defining a development zone for the deposition of the toner particles on the imaging member in image configuration, moving the imaging member containing said nonuniform charge pattern through said development zone, moving a blanket of toner particles through said development zone in the same direction as that of the imaging member and at a speed substantially equal to that of the imaging member, the thickness of said blanket of toner being such that toner particles forming the toner blanket are captured by the nonuniform charge pattern.
Claim 2
Independent Claim
108 words
A method of developing a latent electrostatic nonuniform charge pattern on an imaging member with polar or polarizable toner particles which comprises defining a development zone for the deposition of the toner particles on the imaging member in image configuration, moving the imaging member containing said nonuniform charge pattern through said development zone, moving a blanket of toner particles through said development zone in the same direction as that of the imaging member and at a speed substantially equal to that of the imaging member, the thickness of said blanket of toner being such that toner particles forming the toner blanket are captured by the nonuniform charge pattern.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the blanket of toner particles is subjected to a vibratory motion.
Claim 4
Dependent Claim
27 words
The method of claim 2 wherein the force creating the vibratory motion has a vector at right angles to the direction of travel of the toner blanket.
Claim 5
Dependent Claim
40 words
The method of claim 2 wherein the force creating the vibratory motion has a vector at right angles to the direction of travel of the toner blanket and a vector parallel to the direction of travel of the toner blanket.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the thickness of the blanket of toner is controlled by gravity.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the thickness of the blanket of toner is controlled by a wiping action.
Claim 8
Dependent Claim
102 words
In an electrostatographic recording apparatus including an imaging member that moves through a plurality of processing stations said imaging member having thereon a nonuniform charge pattern in image configuration, the improvement comprising a development means, said development means together with said imaging member defining a development zone where polar or polarizable uncharged toner particles are deposited on said nonuniform charge pattern present on said imaging member, said development means including a toner transport means for moving said uncharged toner through said development zone at a rate substantially equal to the rate at which said imaging member moves through said plurality of stations.
Claim 9
Dependent Claim
102 words
In an electrostatographic recording apparatus including an imaging member that moves through a plurality of processing stations said imaging member having thereon a nonuniform charge pattern in image configuration, the improvement comprising a development means, said development means together with said imaging member defining a development zone where polar or polarizable uncharged toner particles are deposited on said nonuniform charge pattern present on said imaging member, said development means including a toner transport means for moving said uncharged toner through said development zone at a rate substantially equal to the rate at which said imaging member moves through said plurality of stations.
Claim 10
Dependent Claim
39 words
The electrostatographic recording apparatus of claim 7 wherein said toner transport means includes a toner support member and a means for providing motion to said uncharged toner particles along said toner support member towards and through said development zone.
Claim 11
Dependent Claim
19 words
The apparatus of claim 8 wherein said toner support member has associated therewith a toner pile height control means.
Claim 12
Dependent Claim
16 words
The apparatus of claim 9 wherein the toner pile height control means is a blade member.
Claim 13
Dependent Claim
25 words
The apparatus of claim 8 wherein the toner support member is provided with a vibration means for imparting vibratory motion to said toner support member.
Claim 14
Dependent Claim
27 words
The apparatus of claim 11 wherein the plane of vibration of said vibration means provides a force component to said uncharged toner particles toward said development zone.
Claim 15
Dependent Claim
21 words
The apparatus of claim 7 wherein the toner support member is inclined with respect to the horizontal toward said development zone.
Claim 16
Dependent Claim
29 words
The electrostatographic apparatus of claim 7 wherein the toner transport means is a conveyor that moves at the same speed and in the same direction as said imaging member.
Claim 17
Dependent Claim
19 words
The apparatus of claim 14 wherein said transport means includes a means for imparting vibration to said conveyor belt.
Claim 18
Dependent Claim
12 words
The apparatus of claim 14 wherein the conveyor is a continuous belt.
Claim 19
Dependent Claim
12 words
The apparatus of claim 14 wherein the conveyor is a paddle conveyor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |