EP0284307A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Copier control system
Assignee: Xerox Corp
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Filing: 1988-03-18
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Granted: —
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Expires: 2008-03-18
Abstract
Abstract An electrophotographic printing apparatus comprising a photoreceptor (12) and an electrically biassed developer roll (56). Means (66) are provided for sensing the current biassing the developer roll (56) and for generating a proportional control signal for regulating a processing station. Preferably it is the discharge of toner which is regulated. Before the control signal is applied, it is modified by a further signal sampled at selected intervals. The further signal may be generated by either (a) a densitometer (24) measuring the mass to area ratio of the developer deposited on a test area of the photoreceptor (12); or (b) a voltage probe adjacent the photoreceptor. In an alternative embodiment the main control signal is generated by the voltage probe and is modified at selected intervals by the signal from the current sensing means (66).
Inventors
- 👤 Jeffrey J. Folkins
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:47
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G15/5041; G03G15/06; G03G15/08; G03G15/0822; G03G15/0848; G03G15/0849; G03G15/5037; G03G2215/00; G03G2215/00025; G03G2215/00029; G03G2215/00033; G03G2215/00037; G03G2215/00042
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
An electrophotographic printing machine having a photoconductive member and at least one processing station, including means for transporting marking particles closely adjacent the photoconductive member; means for electrically biasing said transporting means to a selected magnitude and polarity; means for sensing the current electrically biasing said transporting means and transmitting a signal proportional thereto; means for generating, at selected intervals, a signal adapted to adjust the signal from said sensing means; and means, responsive to the signal from said sensing means and from said generating means, for producing a control signal for regulating the processing station.
Claim 2
Dependent Claim
96 words
An electrophotographic printing machine having a photoconductive member and at least one processing station, including means for transporting marking particles closely adjacent the photoconductive member; means for electrically biasing said transporting means to a selected magnitude and polarity; means for sensing the current electrically biasing said transporting means and transmitting a signal proportional thereto; means for generating, at selected intervals, a signal adapted to adjust the signal from said sensing means; and means, responsive to the signal from said sensing means and from said generating means, for producing a control signal for regulating the processing station.
Claim 3
Dependent Claim
107 words
An electrophotographic printing machine having a photoconductive member and at least one processing station, including means for transporting marking particles closely adjacent the photoconductive member, means for electrically biassing said transporting means to a selected magnitude and polarity, means for sensing the charge on the photoconductive member and transmitting a signal proportional thereto, means for sensing the current electrically biassing the transporting means and transmitting, at selected intervals, a signal adapted to adjust the signal from the charge sensing means, and means, responsive to the signal from said charge sensing means and from said current sensing means, for producing a control signal for regulating the processing station.
Claim 4
Dependent Claim
107 words
An electrophotographic printing machine having a photoconductive member and at least one processing station, including means for transporting marking particles closely adjacent the photoconductive member, means for electrically biassing said transporting means to a selected magnitude and polarity, means for sensing the charge on the photoconductive member and transmitting a signal proportional thereto, means for sensing the current electrically biassing the transporting means and transmitting, at selected intervals, a signal adapted to adjust the signal from the charge sensing means, and means, responsive to the signal from said charge sensing means and from said current sensing means, for producing a control signal for regulating the processing station.
Claim 5
Dependent Claim
42 words
A printing machine according to claim 1 or 2, wherein said transporting means includes: a tubular member mounted rotatably for transporting the marking particles adjacent the photoconductive member; and an elongated magnetic member disposed interiorly of and spaced from said tubular member.
Claim 6
Dependent Claim
17 words
A printing machine according to any preceding claim, wherein said electrical biasing means includes a voltage source.
Claim 7
Dependent Claim
40 words
A printing machine according to claim 1, or claims 3 or 4, when dependent on claim 1, further including means for forming a test area on the photoconductive member with said transporting means being adapted to deposit marking particles thereon.
Claim 8
Dependent Claim
41 words
A printing machine according to claim 5, wherein said generating means includes a densitometer positioned adjacent said photoconductive member for measuring the mass to area ratio of the marking particles deposited on the test area and generating a signal indicative thereof.
Claim 9
Dependent Claim
24 words
A printing machine according to claim 6, wherein the processing station being regulated by the control signal from said producing means discharges marking particles.
Claim 10
Dependent Claim
31 words
A printing machine according to claim 1, or claims 3 or 4 when dependent from claim 1, wherein said generating means includes an electrostatic voltage probe positioned adjacent said photoconductive member.
Claim 11
Dependent Claim
32 words
A printing machine according to claim 2, or claims 3 and 4 when dependent on claim 2, wherein the charge sensing means includes an electrostatic voltage probe positioned adjacent the photoconductive member.
Claim 12
Dependent Claim
51 words
A printing machine according to claim 8 or 9, wherein the processing station being regulated by the control signal from said producing means (a) charges the photoconductive member; or, (b) exposes the charged portion of the photoconductive member to record the latent image thereon; or (c) controls said electrical biasing means.
References Cited (Backward Citations)
No citation records indexed.
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