US3574301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing apparatus
Assignee: Xerox Corp
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Filing: 1969-04-02
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Granted: 1971-04-13
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Expires: 1989-04-02
Abstract
Abstract An apparatus for developing an electrostatic image on an insulating plate with toner particles including a brushlike developing member, means to generate a cloud of toner particles, a conductive donor member, and means to selectively place electrical biases on the donor member.
Inventors
- 👤 John S Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:37
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0805
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
227 words
An apparatus for developing a surface bearing a latent electrostatic image with toner particles comprising: means for containing a quantity of toner particles adjacent said surface; a fibrous developing brush supported for rotation in the toner container means with the fibers of said brush extending into contact with said surface; means to rotate said developing brush; means to form a cloud of toner particles in said toner container means; a conductive donor member supported for rotation in said toner container means, a portion of said donor member being in contact with said developing brush; means to rotate said donor member to bring successive portions of said donor member in contact with said developing brush; and means to bias said successive portions of said donor member before they are brought in contact with said developing brush to attract toner particles from the toner cloud to said successive portions of the donor member, the the periphery of said donor member having a collection zone in which toner cloud are attracted to the periphery of the donor member and a release zone in which toner particles attracted to said donor member are transferred from said donor member to said developing brush; said release zone encompassing said portion of said donor member which is in contact with said developing brush and said collection zone encompassing the remainder at said donor member.
Claim 2
Independent Claim
227 words
An apparatus for developing a surface bearing a latent electrostatic image with toner particles comprising: means for containing a quantity of toner particles adjacent said surface; a fibrous developing brush supported for rotation in the toner container means with the fibers of said brush extending into contact with said surface; means to rotate said developing brush; means to form a cloud of toner particles in said toner container means; a conductive donor member supported for rotation in said toner container means, a portion of said donor member being in contact with said developing brush; means to rotate said donor member to bring successive portions of said donor member in contact with said developing brush; and means to bias said successive portions of said donor member before they are brought in contact with said developing brush to attract toner particles from the toner cloud to said successive portions of the donor member, the the periphery of said donor member having a collection zone in which toner cloud are attracted to the periphery of the donor member and a release zone in which toner particles attracted to said donor member are transferred from said donor member to said developing brush; said release zone encompassing said portion of said donor member which is in contact with said developing brush and said collection zone encompassing the remainder at said donor member.
Claim 3
Dependent Claim
34 words
The apparatus in claim 1 further including means to bias said portion of said donor member in contact with said developing brush to urge toner particles from said donor member to said developing brush.
Claim 4
Dependent Claim
81 words
The apparatus in claim 2 wherein the donor member is a hollow cylinder having individual elements of conducting and relatively nonconducting material placed adjacent one another in alternate fashion, and means to separately bias said portion of said donor member in contact with said developing brush and said successive portions of said donor member including a source of electrical power operatively connected to a conductive brush which contains electrical contact with the internal surface of said donor member as it rotates.
Claim 5
Dependent Claim
18 words
The apparatus in claim 1 wherein the developing brush is a fur brush having elongated fibers extending therefrom.
Claim 6
Independent Claim
276 words
An apparatus for developing a surface bearing a lent latent electrostatic image with toner particles having a positive charge comprising: means for containing a quantity of toner particles adjacent said surface; a fibrous developing brush supported for rotation in the toner container means with the fibers of said brush extending into contact with said surface; means to rotate said developing brush; means to form a cloud of toner particles in said toner container means; an intermediate roller supported for rotation in said toner container means, said intermediate roller being in contact with said developing brush and being made of a material adapted to carry toner particles having a positive charge; means to roTate said intermediate roller; a conductive donor member supported for rotation in said toner container means, a portion of said donor member being in contact with said intermediate roller; means to rotate said donor member to bring successive portions of said donor member in contact wit said intermediate roller; and means to bias said successive portions of said donor member before they are brought in contact with said intermediate roller to attract toner particles from the toner cloud to said successive portions of the donor member; the periphery of said donor member having a collection zone in which toner particles in said cloud are attracted to the periphery of the donor member and a release zone in which toner particles attracted to said donor member are transferred from said donor member to said intermediate roller, said release zone encompassing said portion of said donor member which is in contact with said intermediate roller and said collection zone encompassing the remainder of said donor member.
Claim 7
Independent Claim
276 words
An apparatus for developing a surface bearing a lent latent electrostatic image with toner particles having a positive charge comprising: means for containing a quantity of toner particles adjacent said surface; a fibrous developing brush supported for rotation in the toner container means with the fibers of said brush extending into contact with said surface; means to rotate said developing brush; means to form a cloud of toner particles in said toner container means; an intermediate roller supported for rotation in said toner container means, said intermediate roller being in contact with said developing brush and being made of a material adapted to carry toner particles having a positive charge; means to roTate said intermediate roller; a conductive donor member supported for rotation in said toner container means, a portion of said donor member being in contact with said intermediate roller; means to rotate said donor member to bring successive portions of said donor member in contact wit said intermediate roller; and means to bias said successive portions of said donor member before they are brought in contact with said intermediate roller to attract toner particles from the toner cloud to said successive portions of the donor member; the periphery of said donor member having a collection zone in which toner particles in said cloud are attracted to the periphery of the donor member and a release zone in which toner particles attracted to said donor member are transferred from said donor member to said intermediate roller, said release zone encompassing said portion of said donor member which is in contact with said intermediate roller and said collection zone encompassing the remainder of said donor member.
Claim 8
Dependent Claim
12 words
The apparatus in claim 5 wherein the intermediate roller material is rayon.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |