Patent US1675185A successfully refreshed from Google Patents.
Patent US3828728A successfully refreshed from Google Patents.
US3828728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic development system
Assignee: Xerox Corp
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Filing: 1971-11-11
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Granted: 1974-08-13
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Expires: 1991-11-11
Abstract
Abstract An apparatus for maintaining a substantially uniform distribution of toner particles within the developer flow in a latent electrostatic image development system in which an electrically conductive member positioned adjacent the flow path of the developer material is connected to a source of electrical potential and biased to a polarity opposite from the polarity on the toner particles in the developer flow. The electrically conductive member is moved in a direction generally transverse to the direction of developer flow. Toner particles are attracted to the conductive member from developer material in portions of the developer flow having greater quantities of toner particles dispersed therein and as the conductive member is transported across the developer flow, toner particles are attracted from the conductive member to portions of the developer flow having lesser quantities of toner particles dispersed therein.
Inventors
- 👤 F Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
299 words
A development system for developing latent electrostatic images on a photosensitive surface comprising: a housing including a sump portion containing a quantity of magnetically attractable developer material comprising carrier granules and toner particles triboelectrically attracted to said carrier granules, a generally cylindrical applicator member supported for rotation within said housing adjacent said photosensitive surface, magnetic field producing means supported within said applicator member, for supporting quantities of said developer material on the surface of said applicator member for contact with said photosensitive surface, a developer distributing member supported for rotation within said housing having a plurality of vanes extending therefrom for transporting developer material from said sump portion into operative contact with said cylindrical applicator member, an electrically conductive member disposed adjacent the path of movement of developer material supported on said applicator member, a source of electrical potential connected to said electrically conductive member to bias said conductive member to a polarity opposite from the polarity of the toner particles in said developer material on said applicator member to create an electric field extending from said electrically conductive member to the developer material on said applicator member, said electric field attracting toner particles to said conductive member from said applicator member from portions of said developer material having greater quantities of toner particles dispersed therein, and means for moving said electrically conductive member in a direction generally transverse to the direction of movement of said developer material on said applicator member to transport toner particles on said conductive member proximate to portions of developer material on said applicator member having lesser quantities of toner particles dispersed therein to permit an attraction of the transported toner particles from said conductive member to said portions of developer material on said applicator member having lesser quantities of toner particles dispersed therein.
Claim 2
Dependent Claim
299 words
A development system for developing latent electrostatic images on a photosensitive surface comprising: a housing including a sump portion containing a quantity of magnetically attractable developer material comprising carrier granules and toner particles triboelectrically attracted to said carrier granules, a generally cylindrical applicator member supported for rotation within said housing adjacent said photosensitive surface, magnetic field producing means supported within said applicator member, for supporting quantities of said developer material on the surface of said applicator member for contact with said photosensitive surface, a developer distributing member supported for rotation within said housing having a plurality of vanes extending therefrom for transporting developer material from said sump portion into operative contact with said cylindrical applicator member, an electrically conductive member disposed adjacent the path of movement of developer material supported on said applicator member, a source of electrical potential connected to said electrically conductive member to bias said conductive member to a polarity opposite from the polarity of the toner particles in said developer material on said applicator member to create an electric field extending from said electrically conductive member to the developer material on said applicator member, said electric field attracting toner particles to said conductive member from said applicator member from portions of said developer material having greater quantities of toner particles dispersed therein, and means for moving said electrically conductive member in a direction generally transverse to the direction of movement of said developer material on said applicator member to transport toner particles on said conductive member proximate to portions of developer material on said applicator member having lesser quantities of toner particles dispersed therein to permit an attraction of the transported toner particles from said conductive member to said portions of developer material on said applicator member having lesser quantities of toner particles dispersed therein.
Claim 3
Dependent Claim
26 words
The development system in accordance with claim 1 wherein said conductive member is positioned substantially adjacent one of the poles of said magnetic field producing means.
Claim 4
Dependent Claim
22 words
The development system in accordance with claim 2 wherein said conductive member includes meanS associated therewith to increase the surface area thereof.
Claim 5
Dependent Claim
22 words
The development system in accordance with claim 1 wherein said conductive member includes means associated therewith to increase the surface area thereof.
Claim 6
Dependent Claim
120 words
A development system for developing latent electrostatic images carried by a photoconductive surface: a sump having developer material therein, means including a magnetic transport means for moving said developer material from said sump along a predetermined path to the photoconductive surface, said developer material including magnetic carrier granules and toner particles triboelectrically attracted to said carrier granules, a member disposed adjacent said magnetic transport means, means for reciprocally moving said member in a transverse direction to said predetermined path for moving toner particles from portions of said developer material on said magnetic transport means having greater quantities of toner particles dispersed therein to portions of developer material on said magnetic transport means having lesser quantities of toner particles dispersed therein.
Claim 7
Dependent Claim
120 words
A development system for developing latent electrostatic images carried by a photoconductive surface: a sump having developer material therein, means including a magnetic transport means for moving said developer material from said sump along a predetermined path to the photoconductive surface, said developer material including magnetic carrier granules and toner particles triboelectrically attracted to said carrier granules, a member disposed adjacent said magnetic transport means, means for reciprocally moving said member in a transverse direction to said predetermined path for moving toner particles from portions of said developer material on said magnetic transport means having greater quantities of toner particles dispersed therein to portions of developer material on said magnetic transport means having lesser quantities of toner particles dispersed therein.
Claim 8
Dependent Claim
21 words
The structure as recited in claim 5 wherein said magnetic transport means is located to present developer to the latent image.
Claim 9
Dependent Claim
188 words
In a development system for developing latent electrostatic images carried by a photoconductive surface: a sump having developer material therein, means including magnetic transport means for moving said developer material from said sump along a predetermined path to the photoconductive surface, said developer material including magnetic carrier granules and toner particles triboelectrically attracted to said carrier granules, an electrically conductive member, an electrically conductive member disposed adjacent said magnetic transport means, means for moving said conductive member in a transverse direction to said predetermined path, a source of electrical potential connected to said electrically conductive member to bias said conductive member to a polarity which is the same as the polarity of the electrostatic image, said electrically conductive member being so located relative to said magnetic transport means that during movement thereof toner particles are attracted thereto from portions of developer material on said magnetic transport means having a greater quantity of toner particles dispersed therein for movement to portions of developer material on said magnetic transport means having lesser quantities of toner particles dispersed therein to permit attraction thereto of the toner particles on said conductive member.
Claim 10
Dependent Claim
188 words
In a development system for developing latent electrostatic images carried by a photoconductive surface: a sump having developer material therein, means including magnetic transport means for moving said developer material from said sump along a predetermined path to the photoconductive surface, said developer material including magnetic carrier granules and toner particles triboelectrically attracted to said carrier granules, an electrically conductive member, an electrically conductive member disposed adjacent said magnetic transport means, means for moving said conductive member in a transverse direction to said predetermined path, a source of electrical potential connected to said electrically conductive member to bias said conductive member to a polarity which is the same as the polarity of the electrostatic image, said electrically conductive member being so located relative to said magnetic transport means that during movement thereof toner particles are attracted thereto from portions of developer material on said magnetic transport means having a greater quantity of toner particles dispersed therein for movement to portions of developer material on said magnetic transport means having lesser quantities of toner particles dispersed therein to permit attraction thereto of the toner particles on said conductive member.
Claim 11
Dependent Claim
16 words
The structure as recited in claim 7 wherein the movement of said conductive member is reciprocal.
Claim 12
Dependent Claim
21 words
The structure as recited in claim 7 wherein said magnetic transport means is located to present developer to the latent image.
References Cited (Backward Citations)
US3380437A
Cited
US3357403A
Cited
US3396700A
Cited
US3645770A
Cited
US3575139A
Cited
US3680779A
Cited
US3707390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |