US4972230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner usage detector based on current biasing mixing means
Assignee: Xerox Corp
•
Filing: 1989-10-31
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Granted: 1990-11-20
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Expires: 2009-10-31
Abstract
Abstract An apparatus which measures the usage of toner in a developer unit. A donor roll receives toner material from a mixer. The mixer fluidizes the toner with the pressure from newly discharged toner moving the fluidized toner from one end of the developer unit to the other end thereof. An electrical bias is applied between the donor roll and mixer. The current biasing the mixer is detected and a signal transmitted in response thereto corresponding to the usage of toner in the developer unit. This signal controls the discharge of toner into the developer unit.
Inventors
- 👤 William H. Wayman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; G03G15/0848; G03G15/0849; G03G15/0851
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
80 words
An apparatus for measuring the usage of toner in a developer unit, including: means for developing a latent image with toner; means for mixing the toner in the developer unit; means for applying an electrical bias between said mixing means and said developing means so that toner is attracted to said developing means; and means for detecting the current biasing said mixing means and transmitting a signal in response thereto corresponding to the usage of toner in the developer unit.
Claim 2
Independent Claim
80 words
An apparatus for measuring the usage of toner in a developer unit, including: means for developing a latent image with toner; means for mixing the toner in the developer unit; means for applying an electrical bias between said mixing means and said developing means so that toner is attracted to said developing means; and means for detecting the current biasing said mixing means and transmitting a signal in response thereto corresponding to the usage of toner in the developer unit.
Claim 3
Dependent Claim
25 words
An apparatus according to claim 1, further including means, responsive to the signal from said detecting means, for discharging additional toner into the developer unit.
Claim 4
Dependent Claim
26 words
An apparatus according to claim 2, further including means for electrically charging the toner being advanced into contact with the latent image by said developing means.
Claim 5
Dependent Claim
25 words
An apparatus according to claim 3, wherein said charging means meters the quantity of toner being advanced by said developing means to the latent image.
Claim 6
Dependent Claim
14 words
An apparatus according to claim 4, wherein said developing means includes a donor roller.
Claim 7
Dependent Claim
27 words
An apparatus according to claim 5, wherein said charging means includes a blade having the free end region thereof resiliently urged into engagement with said donor roller.
Claim 8
Dependent Claim
59 words
An apparatus according to claim 6, wherein said mixing means includes a rotatably mounted elongated member disposed interiorly of the developer unit for fluidizing the toner with the toner being discharged into the developer unit exerting a pressure on the fluidized toner to move the fluidized toner from one end of the developer unit to the other end thereof.
Claim 9
Dependent Claim
37 words
An apparatus according to claim 7, wherein said applying means includes a voltage source electrically coupled to said elongated member and said donor roll to apply an electrically bias between said elongated member and said donor roll.
Claim 10
Dependent Claim
31 words
An apparatus according to claim 8, wherein said voltage source applies an electrical bias ranging from about 250 volts to about 1000 volts between said elongated member and said donor roll.
Claim 11
Dependent Claim
27 words
An apparatus according to claim 9, wherein said voltage source applies an electrical bias preferably of about 600 volts between said elongated member and said donor roll.
Claim 12
Dependent Claim
93 words
An electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member and a developer unit, wherein the improvement includes: means for developing the electrostatic latent image with toner; means for mixing the toner in the developer unit; means for applying an electrical bias between said mixing means and said developing means so that toner is attracted to said developing means; and means for detecting the current biasing said mixing means and transmitting a signal in response thereto corresponding to the usage of toner in the developer unit.
Claim 13
Dependent Claim
93 words
An electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member and a developer unit, wherein the improvement includes: means for developing the electrostatic latent image with toner; means for mixing the toner in the developer unit; means for applying an electrical bias between said mixing means and said developing means so that toner is attracted to said developing means; and means for detecting the current biasing said mixing means and transmitting a signal in response thereto corresponding to the usage of toner in the developer unit.
Claim 14
Dependent Claim
26 words
A printing machine according to claim 11, further including means, responsive to the signal from said detecting means, for discharging additional toner into the developer unit.
Claim 15
Dependent Claim
28 words
A printing machine according to claim 12, further including means for electrically charging the toner being advanced into contact with the electrostatic latent image by said developing means.
Claim 16
Dependent Claim
27 words
A printing machine according to claim 13, wherein said charging means meters the quantity of toner being advanced by said developing means to the electrostatic latent image.
Claim 17
Dependent Claim
15 words
A printing machine according to claim 14, wherein said developing means includes a donor roller.
Claim 18
Dependent Claim
28 words
A printing machine according to claim 15, wherein said charging means includes a blade having the free end region thereof resiliently urged into engagement with said donor roller.
Claim 19
Dependent Claim
60 words
A printing machine according to claim 16, wherein said mixing means includes a rotatably mounted elongated member disposed interiorly of the developer unit for fluidizing the toner with the toner being discharged into the developer unit exerting a pressure on the fluidized toner to move the fluidized toner from one end of the developer unit to the other end thereof.
Claim 20
Dependent Claim
38 words
A printing machine according to claim 17, wherein said applying means includes a voltage source electrically coupled to said elongated member and said donor roll to apply an electrically bias between said elongated member and said donor roll.
Claim 21
Dependent Claim
32 words
A printing machine according to claim 18, wherein said voltage source applies an electrical bias ranging from about 250 volts to about 1000 volts between said elongated member and said donor roll.
Claim 22
Dependent Claim
28 words
A printing machine according to claim 19, wherein said voltage source applies an electrical bias preferably of about 600 volts between said elongated member and said donor roll.
References Cited (Backward Citations)
US3821938A
Cited
US3932034A
Cited
US4064834A
Cited
US4270487A
Cited
US4338019A
Cited
US4343548A
Cited
US4786869A
Cited
US4508052A
Cited
US4669852A
Cited
US4686934A
Cited
JPS61235872A
Cited
US4643561A
Cited
JPS63180983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |