US5754918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic control with compensation for coupling effects
Assignee: Xerox Corp
•
Filing: 1996-12-04
•
Granted: 1998-05-19
•
Expires: 2016-12-04
Abstract
Abstract An electrostatographic printing machine having an imaging member with a surface voltage potential and a control system including first and second reference values. A sensor measures first and second surface voltage potentials that are compared to the first and second reference values to provide first and second error signals to control first and second process stations in the printing machine. A first compensator responds to the first error signal to provide a first weighted adjustment to the first process station and a second weighted adjustment to the second process station. A second compensator responds to the second error signal to provide a first weighted adjustment to the second process station and a second weighted adjustment to the first process station in order to compensate for coupling effects between adjustments to either the first or second processing stations.
Inventors
- 👤 Lingappa K. Mestha
- 👤 Prasad Padmanabhan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G15/5037; G03G15/02; G03G15/0266
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
121 words
In an electrostatographic printing machine having an imaging member with a surface including a control system: a sensor to measure first and second surface voltage potentials, a first control loop responsive to the first surface voltage potential measured by the sensor to provide a first adjustment to the printing machine, a second control loop responsive to the second surface voltage potential measured by the sensor to provide a second adjustment to the printing machine, wherein the improvement comprises first circuitry responsive to the first surface voltage potential to effect the second control loop and second circuitry responsive to the second surface voltage potential to effect the first control loop wherein the first circuitry and the second circuitry include look up tables.
Claim 2
Dependent Claim
121 words
In an electrostatographic printing machine having an imaging member with a surface including a control system: a sensor to measure first and second surface voltage potentials, a first control loop responsive to the first surface voltage potential measured by the sensor to provide a first adjustment to the printing machine, a second control loop responsive to the second surface voltage potential measured by the sensor to provide a second adjustment to the printing machine, wherein the improvement comprises first circuitry responsive to the first surface voltage potential to effect the second control loop and second circuitry responsive to the second surface voltage potential to effect the first control loop wherein the first circuitry and the second circuitry include look up tables.
Claim 3
Dependent Claim
18 words
The electrostatographic printing machine of claim 1 wherein the first circuitry and the second circuitry include summing nodes.
Claim 4
Dependent Claim
18 words
The electrostatographic printing machine of claim 1 wherein the first circuitry and the second circuitry include weighted compensators.
Claim 5
Dependent Claim
24 words
The electrostatographic printing machine of claim 2 including a Direct Loop Compensator interconnecting said first and second surface voltage potentials to the summing nodes.
Claim 6
Dependent Claim
163 words
A printing machine having an imaging member with a surface including a control system comprising: first and second reference values, a sensor to measure first and second surface voltage potentials of the imaging member the first and second surface voltage potentials being compared to the first and second reference values to provide first and second error signals to control first and second process stations in the printing machine, a first compensator responsive to the first error signal to provide a first weighted adjustment to the first process station and a second weighted adjustment to the second process station, and a second compensator responsive to the second error signal to provide a first weighted adjustment to the second process station and a second weighted adjustment to the first process station in order to compensate for coupling effects between adjustments to either the first or second processing stations wherein the first and second surface voltage Potentials are unexposed and exposed voltages on the imaging member.
Claim 7
Dependent Claim
163 words
A printing machine having an imaging member with a surface including a control system comprising: first and second reference values, a sensor to measure first and second surface voltage potentials of the imaging member the first and second surface voltage potentials being compared to the first and second reference values to provide first and second error signals to control first and second process stations in the printing machine, a first compensator responsive to the first error signal to provide a first weighted adjustment to the first process station and a second weighted adjustment to the second process station, and a second compensator responsive to the second error signal to provide a first weighted adjustment to the second process station and a second weighted adjustment to the first process station in order to compensate for coupling effects between adjustments to either the first or second processing stations wherein the first and second surface voltage Potentials are unexposed and exposed voltages on the imaging member.
Claim 8
Dependent Claim
24 words
The printing machine of claim 5 wherein the first process station is a charging station and the second process station is an exposure station.
Claim 9
Dependent Claim
32 words
The printing machine of claim 5 including a first summing node connecting the compensators to the first process station and a second summing node connecting the compensators to the second process station.
Claim 10
Dependent Claim
13 words
The printing machine of claim 5 wherein the sensor is an electrostatic voltmeter.
Claim 11
Dependent Claim
89 words
A printing machine having an imaging member and a control system comprising: a first reference value, a sensor to measure a first characteristic of the imaging member, the first characteristic being compared to the first reference value to provide a first error signal to control process stations in the printing machine, and first circuitry responsive to the first error signal to provide a first weighted adjustment to a first process station and a second weighted adjustment to a second process station wherein the first circuitry includes a summing node.
Claim 12
Dependent Claim
89 words
A printing machine having an imaging member and a control system comprising: a first reference value, a sensor to measure a first characteristic of the imaging member, the first characteristic being compared to the first reference value to provide a first error signal to control process stations in the printing machine, and first circuitry responsive to the first error signal to provide a first weighted adjustment to a first process station and a second weighted adjustment to a second process station wherein the first circuitry includes a summing node.
Claim 13
Dependent Claim
67 words
The printing machine of claim 9 including a second reference value, the sensor measuring a second characteristic of the imaging member, the second characteristic being compared to the second reference value to provide a second error signal, and second circuitry responsive to the second error signal to provide a first weighted adjustment to the second process station and a second weighted adjustment to the first process station.
Claim 14
Dependent Claim
15 words
The printing machine of claim 10 wherein the first and second characteristics are voltage potentials.
Claim 15
Dependent Claim
14 words
The printing machine of claim 9 wherein the first circuitry includes a weighted compensator.
Claim 16
Dependent Claim
15 words
The printing machine of claim 9 wherein the first circuitry includes a look up table.
Claim 17
Dependent Claim
19 words
The printing machine of claim 9 including a Direct Loop Compensator interconnecting the second characteristic to the summing node.
Claim 18
Dependent Claim
61 words
In a printing machine having process stations: a sensor to measure machine characteristics, control loops responsive to machine characteristics to provide adjustments to process stations, and circuitry responsive to a control loop providing adjustments to a first process station effecting adjustments to a second process station in order to compensate for coupling effects wherein the circuitry includes a look up table.
Claim 19
Dependent Claim
61 words
In a printing machine having process stations: a sensor to measure machine characteristics, control loops responsive to machine characteristics to provide adjustments to process stations, and circuitry responsive to a control loop providing adjustments to a first process station effecting adjustments to a second process station in order to compensate for coupling effects wherein the circuitry includes a look up table.
Claim 20
Dependent Claim
13 words
The printing machine of claim 15 wherein the circuitry includes a summing node.
Claim 21
Dependent Claim
13 words
The printing machine of claim 15 wherein the circuitry includes a weighted compensator.
Claim 22
Dependent Claim
108 words
A printing machine having an imaging member and a control comprising: a sensor to measure first and second surface voltage potentials, a first control loop responsive to the first surface voltage potential measured by the sensor to provide a first adjustment to the printing machine, a second control loop responsive to the second surface voltage potential measured by the sensor to provide a second adjustment to the printing machine, first circuitry including a summing node responsive to the first surface voltage potential to effect the second control loop, and second circuitry including a summing node responsive to the second surface voltage potential to effect the first control loop.
Claim 23
Dependent Claim
108 words
A printing machine having an imaging member and a control comprising: a sensor to measure first and second surface voltage potentials, a first control loop responsive to the first surface voltage potential measured by the sensor to provide a first adjustment to the printing machine, a second control loop responsive to the second surface voltage potential measured by the sensor to provide a second adjustment to the printing machine, first circuitry including a summing node responsive to the first surface voltage potential to effect the second control loop, and second circuitry including a summing node responsive to the second surface voltage potential to effect the first control loop.
References Cited (Backward Citations)
US5243383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |