Patent US5034775A successfully refreshed from Google Patents.
US5034775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triboelectric charge measurement
Assignee: Xerox Corp
•
Filing: 1990-02-26
•
Granted: 1991-07-23
•
Expires: 2010-02-26
Abstract
Abstract An apparatus in which the triboelectric charge of developer material toner adhering to carrier is measured. In the development system, a magnetic roller transports developer material closely adjacent a donor roller. The donor roller is electrically biased relative to the magnetic roller so that toner is developed onto the donor roller. The instantaneous current flow electrically biasing the donor roller is integrated and is indicative of the triboelectric charge to the developer material.
Inventors
- 👤 Jeffrey J. Folkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0803; G03G15/0806; G03G15/0808; G03G15/0822; G03G15/0848; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/0619; G03G2215/0634; G03G2215/0636; G03G2215/0643
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
128 words
An apparatus for measuring triboelectric charge of developer material having toner adhering to carrier, including: a housing defining a chamber storing a supply of the developer material therein; a donor member disposed, at least partially in the chamber of said housing; means for transporting developer material to a region adjacent said donor member; means for electrically biasing said donor member and said transporting means relative to one another so as to deposit toner on said donor member; means for detecting a current biasing said donor member and said transporting means relative to one another and transmitting a signal in response thereto corresponding to the triboelectric charge of the developer material; and means, responsive to the signal from said detecting and transmitting means, for controlling said electrical biasing means.
Claim 2
Independent Claim
128 words
An apparatus for measuring triboelectric charge of developer material having toner adhering to carrier, including: a housing defining a chamber storing a supply of the developer material therein; a donor member disposed, at least partially in the chamber of said housing; means for transporting developer material to a region adjacent said donor member; means for electrically biasing said donor member and said transporting means relative to one another so as to deposit toner on said donor member; means for detecting a current biasing said donor member and said transporting means relative to one another and transmitting a signal in response thereto corresponding to the triboelectric charge of the developer material; and means, responsive to the signal from said detecting and transmitting means, for controlling said electrical biasing means.
Claim 3
Dependent Claim
30 words
An apparatus according to claim 1, wherein said detecting and transmitting means includes means for integrating the current biasing said donor member and said transporting means relative to one another.
Claim 4
Dependent Claim
57 words
An apparatus according to claim 1, further including an electrode member positioned adjacent said donor member in a region thereof opposed from said transporting means, said electrode member being closely spaced from said donor member and being adapted to be electrically biased to detach toner from said donor member to form a toner cloud in the space.
Claim 5
Dependent Claim
12 words
An apparatus according to claim 3, wherein the developer material is magnetic.
Claim 6
Dependent Claim
32 words
An apparatus according to claim 4, wherein said transporting means includes means for attracting magnetically developer material from the supply thereof in the chamber of said housing to the exterior surface thereof.
Claim 7
Dependent Claim
55 words
An apparatus according to claim 5, wherein said attracting means includes: a non-magnetic tubular member mounted rotatably so as to advance developer material from the chamber of said housing to said donor member; and an elongated magnetic member disposed interiorly of said tubular member for attracting developer material to the surface of said tubular member.
Claim 8
Dependent Claim
13 words
An apparatus according to claim 5, wherein said donor member includes a roll.
Claim 9
Dependent Claim
17 words
An apparatus according to claim 6, wherein said electrode member includes a plurality of small diameter wires.
Claim 10
Dependent Claim
156 words
An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed to form a visible image thereof, wherein the improvement includes: a housing defining a chamber storing a supply of developer material comprising at least carrier and toner; a donor member spaced from the photoconductive member and being adapted to transport toner to a region opposed from the photoconductive member; means for transporting developer material to a region adjacent said donor member; means for electrically biasing said donor member and said transporting means relative to one another so as to deposit toner on said donor member; means for detecting a current biasing said donor member and said transporting means relative to one another and transmitting a signal in response thereto corresponding to the triboelectric charge of the developer material; and means, responsive to the signal from said detecting and transmitting means, for controlling said electrical biasing means.
Claim 11
Dependent Claim
156 words
An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed to form a visible image thereof, wherein the improvement includes: a housing defining a chamber storing a supply of developer material comprising at least carrier and toner; a donor member spaced from the photoconductive member and being adapted to transport toner to a region opposed from the photoconductive member; means for transporting developer material to a region adjacent said donor member; means for electrically biasing said donor member and said transporting means relative to one another so as to deposit toner on said donor member; means for detecting a current biasing said donor member and said transporting means relative to one another and transmitting a signal in response thereto corresponding to the triboelectric charge of the developer material; and means, responsive to the signal from said detecting and transmitting means, for controlling said electrical biasing means.
Claim 12
Dependent Claim
31 words
A printing machine according to claim 9, wherein said detecting and transmitting means includes means for integrating the current biasing said donor member and said transporting means relative to one another.
Claim 13
Dependent Claim
58 words
A printing machine according to claim 9, further including an electrode member positioned adjacent said donor member in the region thereof opposed from the photoconductive member, said electrode member being closely spaced from said donor member and being adapted to be electrically biased to detach toner from said donor member to form a toner cloud in the space.
Claim 14
Dependent Claim
19 words
A printing machine according to claim 11, wherein the developer material in the chamber of said housing is magnetic.
Claim 15
Dependent Claim
33 words
A printing machine according to claim 12, wherein said transporting means includes means for attracting magnetically developer material from the supply thereof in the chamber of said housing to the exterior surface thereof.
Claim 16
Dependent Claim
56 words
A printing machine according to claim 13, wherein said attracting means includes: a non-magnetic tubular member mounted rotatably so as to advance developer material from the chamber of said housing to said donor member; and an elongated magnetic member disposed interiorly of said tubular member for attracting developer material to the surface of said tubular member.
Claim 17
Dependent Claim
14 words
A printing machine according to claim 14, wherein said donor member includes a roll.
Claim 18
Dependent Claim
18 words
A printing machine according to claim 15, wherein said electrode member includes a plurality of small diameter wires.
References Cited (Backward Citations)
JPS53119049A
Cited
US4319544A
Cited
JPS5868758A
Cited
US4538897A
Cited
US4492179A
Cited
US4833500A
Cited
US4686934A
Cited
US4643561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |