US3765026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic recording system
Assignee: Xerox Corp
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Filing: 1970-11-03
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Granted: 1973-10-09
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Expires: 1990-11-03
Abstract
Abstract An electrographic contact charging apparatus is provided comprising a roll containing a plurality of spaced electrodes in the surface thereof, said electrodes being disposed concentrically with the axis of rotation of said roll; a grounded electrode being spaced from said roll and parallel with the axis of rotation thereof and extending substantially coterminously with said roll; said grounded electrode and the electrodes in said roll being adapted to make contact in the nip formed therebetween with a dielectric medium adapted to pass therethrough; means for generating sequential informational triggering pulses; and commutating means for connecting the electrodes in said roll with said means for generating said triggering pulses. In another embodiment, a process is provided for continuous electrographic recording comprising passing an insulating web through the nip formed by a first roll containing a plurality of spaced electrodes in the surface thereof, said electrodes being disposed concentrically with the axis of rotation of said roll and at least one grounded electrode spaced from said roll and parallel with the axis of rotation thereof and extending substantially coterminously with said roll; forming electrostatic latent images on the web by selective charge transfer between the electrodes in said roll and said grounded electrode generated by sequential informational triggering pulses applied to the electrodes in said roll; and developing said electrostatic latent images.
Inventors
- 👤 A Rittler
- 👤 M Wilmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:18
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
162 words
An electrographic contact charging apparatus imparting to a dielectric medium surface an image, said apparatus comprising first and second rolls adapted to make line contact in the nip formed therebetween with said dielectric medium adapted to pass therethrough, said first roll having a plurality of spaced electrodes in the surface thereof, said first roll electrodes being disposed concentrically with the axis of rotation; said second roll having a plurality of spaced electrodes in the surface thereof, said second roll electrodes being disposed parallel with the axis of rotation, means for grounding the electrodes of said second roll upon entering the nip, means for generating sequential informational triggering pulses, and commutating means for connecting the electrodes of said first roll with said means for generating said triggering pulses, each of said triggering pulses causing transfer of a single electrostatic point image to said dielectric medium at the point of virtual intersection of a spaced electrode receiving a triggering pulse and said grounded electrode.
Claim 2
Dependent Claim
162 words
An electrographic contact charging apparatus imparting to a dielectric medium surface an image, said apparatus comprising first and second rolls adapted to make line contact in the nip formed therebetween with said dielectric medium adapted to pass therethrough, said first roll having a plurality of spaced electrodes in the surface thereof, said first roll electrodes being disposed concentrically with the axis of rotation; said second roll having a plurality of spaced electrodes in the surface thereof, said second roll electrodes being disposed parallel with the axis of rotation, means for grounding the electrodes of said second roll upon entering the nip, means for generating sequential informational triggering pulses, and commutating means for connecting the electrodes of said first roll with said means for generating said triggering pulses, each of said triggering pulses causing transfer of a single electrostatic point image to said dielectric medium at the point of virtual intersection of a spaced electrode receiving a triggering pulse and said grounded electrode.
Claim 3
Dependent Claim
196 words
An electrographic contact charging apparatus imparting to a dielectric medium surface an image, said apparatus comprising first and second rolls adapted to make line contact in the nip formed therebetween with said dielectric medium adapted to pass therethrough, means including an ionization electrode for electrically prestressing said web to a potential below the critical stress value at which charge migration occurs, said first roll having a plurality of spaced electrodes in the surface thereof, said first roll electrodes being disposed concentrically with the axis of rotation; said second roll having a plurality of spaced electrodes in the surface thereof, said second roll electrodes being disposed parallel with the axis of rotation, means for grounding the electrodes of said second roll upon entering the nip, means for generating sequential informational triggering pulses, and commutating means for connecting the electrodes of said first roll with said means for generating said triggering pulses, each of said triggering pulses providing an electrostatic field sufficient to exceed said critical stress value causing transfer of a single electrostatic point image to said dielectric medium at the point of virtual intersection of a spaced electrode receiving a triggering pulse and said grounded electrode.
Claim 4
Dependent Claim
196 words
An electrographic contact charging apparatus imparting to a dielectric medium surface an image, said apparatus comprising first and second rolls adapted to make line contact in the nip formed therebetween with said dielectric medium adapted to pass therethrough, means including an ionization electrode for electrically prestressing said web to a potential below the critical stress value at which charge migration occurs, said first roll having a plurality of spaced electrodes in the surface thereof, said first roll electrodes being disposed concentrically with the axis of rotation; said second roll having a plurality of spaced electrodes in the surface thereof, said second roll electrodes being disposed parallel with the axis of rotation, means for grounding the electrodes of said second roll upon entering the nip, means for generating sequential informational triggering pulses, and commutating means for connecting the electrodes of said first roll with said means for generating said triggering pulses, each of said triggering pulses providing an electrostatic field sufficient to exceed said critical stress value causing transfer of a single electrostatic point image to said dielectric medium at the point of virtual intersection of a spaced electrode receiving a triggering pulse and said grounded electrode.
Claim 5
Dependent Claim
172 words
Process for continuous electrographic recording comprising: i. passing an insulating web through the nip formed by a first roll containing a plurality of spaced electrodes in the surface thereof, said electrodes being disposed concentrically with the axis of rotation of said roll and at least one grounded electrode spaced from said roll and parallel with the axis of rotation thereof and extending substantially coterminously with said roll, said grounded electrode comprising a second roll containing a plurality of spaced electrodes in the surface thereof, said second roll electrodes being disposed parallel with the axis of rotation, and means for grounding the electrodes of said second roll upon entering the nip formed between said first and second rolls; ii. providing electrostatic latent images formed of an arrangement of like point images on the web by selective charge transfer of point images between the electrodes in said first roll and said grounded electrode generated by sequential informational triggering pulses applied to the electrodes in said first roll; and iii. developing said electrostatic latent images.
Claim 6
Dependent Claim
172 words
Process for continuous electrographic recording comprising: i. passing an insulating web through the nip formed by a first roll containing a plurality of spaced electrodes in the surface thereof, said electrodes being disposed concentrically with the axis of rotation of said roll and at least one grounded electrode spaced from said roll and parallel with the axis of rotation thereof and extending substantially coterminously with said roll, said grounded electrode comprising a second roll containing a plurality of spaced electrodes in the surface thereof, said second roll electrodes being disposed parallel with the axis of rotation, and means for grounding the electrodes of said second roll upon entering the nip formed between said first and second rolls; ii. providing electrostatic latent images formed of an arrangement of like point images on the web by selective charge transfer of point images between the electrodes in said first roll and said grounded electrode generated by sequential informational triggering pulses applied to the electrodes in said first roll; and iii. developing said electrostatic latent images.
Claim 7
Dependent Claim
35 words
Process as defined in claim 3 wherein the insulatIng web is initially prestressed to a potential below the critical stress value at which charge migration occurs upon passage through a zone containing an ionization electrode.
Claim 8
Dependent Claim
15 words
Process as defined in claim 3 wherein the developed image is subsequently fused in place.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |