US3559620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyance of electrically charged sheets
Assignee: Individual
•
Filing: 1968-08-16
•
Granted: 1971-02-02
•
Expires: 1988-08-16
Abstract
Abstract An electrophotographic apparatus wherein charged sheets are conveyed from a liquid developer to a dryer by a pair of rollers of insulating material, suitably polyurethane. Each of these insular rollers is engaged by a stainless steel roller which is maintained at a predetermined electrical potential and thereby reduces the amount of electrical charge, picked up by the associated insulating roller, which is returned to a subsequent part of the sheet. The stainless steel rollers may be maintained at a high potential of the same polarity of the toner particles used in the developer, in which case there is a reduction in the number of particles, picked up by the insulating rollers, which is returned to the sheet.
Inventors
- 👤 Martin R P Seib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:12
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/11
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
Means for conveying a charged sheet of electrophotographic paper from liquid developer means to drying means comprising cooperating driving rollers which are adapted to engage respective opposite sides of the sheet and, in driving the sheet along a predetermined path, to remove liquid developer therefrom, each driving roller having the sheet engaging surface thereof formed of electrically insulating material, each driving roller which engages a photoconductive layer of the sheet being engaged at a location spaced from the path of the sheet by an electrically conductive roller, and means for maintaining the electrically conductive rollers at a predetermined electrical potential, whereby the electrically conductive roller reduces the amount of electrical charge, transferred to the associated driving roller from the charged sheet, which is transferred back from the driving roller to a part of the sheet subsequently engaged by the driving rollers.
Claim 2
Dependent Claim
141 words
Means for conveying a charged sheet of electrophotographic paper from liquid developer means to drying means comprising cooperating driving rollers which are adapted to engage respective opposite sides of the sheet and, in driving the sheet along a predetermined path, to remove liquid developer therefrom, each driving roller having the sheet engaging surface thereof formed of electrically insulating material, each driving roller which engages a photoconductive layer of the sheet being engaged at a location spaced from the path of the sheet by an electrically conductive roller, and means for maintaining the electrically conductive rollers at a predetermined electrical potential, whereby the electrically conductive roller reduces the amount of electrical charge, transferred to the associated driving roller from the charged sheet, which is transferred back from the driving roller to a part of the sheet subsequently engaged by the driving rollers.
Claim 3
Dependent Claim
22 words
Conveying means as claimed in claim 1, wherein means are provided for maintaining the or each electrically conductive roller at earth potential.
Claim 4
Dependent Claim
77 words
Conveying means as claimed in claim 1, wherein means are provided for maintaining the or each electrically conductive roller at a high electrical potential of the same polarity as the polarity of the toner particles on the sheet, whereby there is a reduction in the number of toner particles, transferred to the or each associated driving roller from the charged sheet, which are transferred back to a part of the sheet subsequently engaged by the driving rollers.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |