Patent DE854029C successfully refreshed from Google Patents.
US4023899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excess developing liquid removing device for electrophotography
Assignee: Ricoh Co Ltd
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Filing: 1975-06-25
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Granted: 1977-05-17
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Expires: 1995-06-25
Abstract
Abstract A roller is disposed parallel and adjacent to a photoconductive drum with a small gap inbetween. The roller is made of an electrically conductive material and covered with an insulating coating of hard anodized aluminum. The roller is fixed to a shaft which is driven to rotate the roller in the same direction as the drum to remove excess developing liquid from the drum through viscous friction. Electrically conductive bearings are mounted on the ends of the shaft which have an outer diameter greater than the diameter of the roller. The bearings rotatably contact the surface of the drum to maintain the gap. Either insulating plastic bushings or layers of alumite are disposed between the ends of the shaft and the bearings to insulate the shaft from the bearings and thereby from the drum.
Inventors
- 👤 Toshio Hayashi
- 👤 Osamu Haruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:44
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/11
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
In an electrophotographic device having a moving photoconductive member and means for applying liquid developer to the surface of the photoconductive member, the combination therewith of: an electrically conductive shaft disposed downstream of said means, the axis of the shaft being perpendicular to the direction of movement of the photoconductive member; an electrically conductive roller integrally fixed for rotation with the shaft, the shaft extending external of the ends of the roller; two rolling contact bearings supported by the respective ends of the shaft, the outer diameters of the bearings being greater than the diameter of the roller, the outer surfaces of the bearings rollingly engaging with the surface of the photoconductive member; drive means to rotate the shaft so that the surface of the roller moves in a direction opposite to the surface of the photoconductive member, the drive means being electrically insulated from the shaft; first electrical insulating means covering the surface of the roller; and second electrical insulating means disposed between the ends of the shaft and the respective bearings.
Claim 2
Dependent Claim
173 words
In an electrophotographic device having a moving photoconductive member and means for applying liquid developer to the surface of the photoconductive member, the combination therewith of: an electrically conductive shaft disposed downstream of said means, the axis of the shaft being perpendicular to the direction of movement of the photoconductive member; an electrically conductive roller integrally fixed for rotation with the shaft, the shaft extending external of the ends of the roller; two rolling contact bearings supported by the respective ends of the shaft, the outer diameters of the bearings being greater than the diameter of the roller, the outer surfaces of the bearings rollingly engaging with the surface of the photoconductive member; drive means to rotate the shaft so that the surface of the roller moves in a direction opposite to the surface of the photoconductive member, the drive means being electrically insulated from the shaft; first electrical insulating means covering the surface of the roller; and second electrical insulating means disposed between the ends of the shaft and the respective bearings.
Claim 3
Dependent Claim
38 words
The device according to claim 1, in which the first electrical insulating means is a layer of hard anodized aluminum having a dielectric breakdown strength greater than 250 volts and an insulation resistance greater than 10 6 ohms.
Claim 4
Dependent Claim
37 words
The device according to claim 1, in which the first electrical insulating means is a layer of hard resin having a dielectric breakdown strength greater than 250 volts and an insulation resistance greater than 10 6 ohms.
Claim 5
Dependent Claim
33 words
The device according to claim 1, in which the second electrical insulating means comprises two bushings made of an electrical insulating material disposed between the ends of the shaft and the respective bearings.
Claim 6
Dependent Claim
14 words
The device according to claim 4, in which the electrical insulating material comprises plastics.
Claim 7
Dependent Claim
18 words
The device according to claim 1, in which the second electrical insulating means comprises a layer of alumite.
Claim 8
Dependent Claim
18 words
The device according to claim 1, further comprising biasing means for applying a bias potential to the roller.
Claim 9
Dependent Claim
18 words
The device according to claim 7, in which the biasing means comprises a direct current electric power source.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |