Patent US4330193A successfully refreshed from Google Patents.
US4330193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development system
Assignee: Xerox Corp
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Filing: 1979-10-01
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Granted: 1982-05-18
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Expires: 1999-10-01
Abstract
Abstract Apparatus in which a plurality of spaced apart magnetic members transport developer material from a supply thereof. The spaces between adjacent magnetic members enable extraneous developer material to pass therethrough and return to the storage supply thereof.
Inventors
- 👤 Klaus K. Stange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:17
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
207 words
An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed with a developer material, wherein the improvement includes: means for storing a supply of developer material; a plurality of elongated magnetic members for attracting the developer material thereto; means for rigidly supporting said magnetic members with adjacent magnetic members being spaced from one another and the longitudinal axes thereof substantially parallel to one another so that said magnetic members form the exterior circumferential surface of a cylindrical configuration defining an interior chamber with developer passing between adjacent magnetic members to the interior chamber and returning to said storing means, said supporting means being positioned relative to the photoconductive member to define a pre-selected gap between said magnetic members and the photoconductive member; and means for moving said supporting means so that said magnetic members transport the developer material from said storing means into contact with the latent image recorded on the photoconductive member so as to deposit developer material on the photoconductive member in image configuration, said moving means moving said supporting means at a preselected velocity relative to the photoconductive member to maintain the area of developer material contacting the photoconductive member at a preselected size.
Claim 2
Dependent Claim
207 words
An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed with a developer material, wherein the improvement includes: means for storing a supply of developer material; a plurality of elongated magnetic members for attracting the developer material thereto; means for rigidly supporting said magnetic members with adjacent magnetic members being spaced from one another and the longitudinal axes thereof substantially parallel to one another so that said magnetic members form the exterior circumferential surface of a cylindrical configuration defining an interior chamber with developer passing between adjacent magnetic members to the interior chamber and returning to said storing means, said supporting means being positioned relative to the photoconductive member to define a pre-selected gap between said magnetic members and the photoconductive member; and means for moving said supporting means so that said magnetic members transport the developer material from said storing means into contact with the latent image recorded on the photoconductive member so as to deposit developer material on the photoconductive member in image configuration, said moving means moving said supporting means at a preselected velocity relative to the photoconductive member to maintain the area of developer material contacting the photoconductive member at a preselected size.
Claim 3
Dependent Claim
32 words
A printing machine as recited in claim 1, wherein each of said plurality of magnetic members includes a magnetic strip with each of said magnetic strips being substantially parallel to one another.
Claim 4
Dependent Claim
54 words
A printing machine as recited in claim 2, wherein each of said supporting means includes: at least a pair of spaced apart discs; and a plurality of spaced apart bars connecting said pair of discs to one another with each of said plurality of bars being arranged to support one of said magnetic strips.
Claim 5
Dependent Claim
19 words
A printing machine as recited in claim 3, wherein said plurality of bars are equally spaced from one another.
Claim 6
Dependent Claim
31 words
A printing machine as recited in claim 4, wherein each of said plurality of bars are connected to the outer periphery of said pair of discs to define the cylindrical configuration.
Claim 7
Dependent Claim
28 words
A printing machine as recited in claims 1 or 5, further including means for metering the quantity of developer material being transported by said plurality of magnetic members.
Claim 8
Dependent Claim
40 words
A printing machine as recited in claim 6, wherein said metering means includes a blade member having the leading edge thereof spaced from said plurality of magnetic members to define a gap controlling the quantity of developer material passing therethrough.
Claim 9
Dependent Claim
30 words
A printing machine as recited in claims 2 or 5, wherein opposed magnetic poles extending longitudinally along adjacent ones of said plurality of magnetic strips have the same magnetic polarity.
Claim 10
Dependent Claim
21 words
A printing machine as recited in claim 1 or 5, wherein each of said plurality of magnetic members are electrically conductive.
Claim 11
Dependent Claim
28 words
A printing machine as recited in claims 1 or 5, wherein the developer material includes: magnetic carrier granules; and non-magnetic toner particles adhering triboelectrically to said carrier granules.
Claim 12
Dependent Claim
19 words
A printing machine as recited in claim 10, further including means for dispensing toner particles into said storing means.
Claim 13
Dependent Claim
52 words
A printing machine as recited in claim 11, further including means for detecting the concentration of toner particles in the developer material and actuating said dispensing means to discharge additional toner particles into the developer material in said storing means in response to the toner particle concentration being beneath a pre-determined level.
Claim 14
Dependent Claim
19 words
A printing machine as recited in claim 11, wherein said dispensing means is positioned interiorly of said supporting means.
Claim 15
Dependent Claim
17 words
A printing machine as recited in claims 1 or 5, wherein the developer material includes magnetic particles.
Claim 16
Dependent Claim
17 words
A printing machine as recited in claim 5, wherein each of said plurality of bars are magnetic.
Claim 17
Independent Claim
25 words
An apparatus as recited in claims 1 or 5, further including means for electrically biasing said plurality of magnetic members to a pre-determined voltage level.
References Cited (Backward Citations)
US2822779A
Cited
US3064622A
Cited
US3233586A
Cited
US3392432A
Cited
US3318284A
Cited
US3636926A
Cited
US3584601A
Cited
US3848566A
Cited
US3698926A
Cited
US3776630A
Cited
US3870017A
Cited
US3926516A
Cited
US4147127A
Cited
US4139296A
Cited
US4226524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |