Patent US4223993A successfully refreshed from Google Patents.
US4223993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic apparatus
Assignee: Olympus Corp
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Filing: 1979-06-22
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Granted: 1980-09-23
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Expires: 1999-06-22
Abstract
Abstract An electrophotographic apparatus comprising a charge retentive drum such as a photosensitive drum including an electrically conductive drum substrate and a charge retentive layer applied on the drum substrate, a developing device for developing an electrostatic latent image formed on the drum with toner to form a toner image, a transfer roller for transferring the toner image onto a record paper, the record paper being fed between the drum and the transfer roller, a peelling claw for peeling the record paper having the toner image transferred thereto off the drum surface, the peeling claw being made of conductive metal and its free end being urged against a depressed edge portion of the conductive drum substrate, and means for connecting the peeling claw to the earth potential.
Inventors
- 👤 Hiroshi Tsuda
- 👤 Kiyoshi Miyashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:30
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; B; B65; B65H; B65H29/00; B65H29/54; B65H29/56; G03G21/00; G03G21/0005; G03G21/0035; G03G2221/00; G03G2221/0005; Y; Y10; Y10S; Y10S271/00; Y10S271/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
144 words
An electrophotographic apparatus comprising an electrostatic charge retentive drum arranged rotatably about its axis and including a drum-shaped substrate made of electrically conductive material and a charge retentive layer applied on the drum substrate; means for transferring a toner image formed on the charge retentive layer onto a record carrier, while the record carrier is fed with being made into intimately contact with the charge retentive drum surface; at least one peeling claw for peeling the record carrier off the drum after the toner image has been transferred onto the record carrier and made of electrically conductive material, said peeling claw being urged against one side edge portion of the drum substrate of the charge retentive drum; and means for connecting the peeling claw to the earth potential so as to contact conductively the drum substrate to the earth potential via the peeling claw.
Claim 2
Dependent Claim
144 words
An electrophotographic apparatus comprising an electrostatic charge retentive drum arranged rotatably about its axis and including a drum-shaped substrate made of electrically conductive material and a charge retentive layer applied on the drum substrate; means for transferring a toner image formed on the charge retentive layer onto a record carrier, while the record carrier is fed with being made into intimately contact with the charge retentive drum surface; at least one peeling claw for peeling the record carrier off the drum after the toner image has been transferred onto the record carrier and made of electrically conductive material, said peeling claw being urged against one side edge portion of the drum substrate of the charge retentive drum; and means for connecting the peeling claw to the earth potential so as to contact conductively the drum substrate to the earth potential via the peeling claw.
Claim 3
Dependent Claim
41 words
An electrophotographic apparatus according to claim 1, wherein the drum substrate has formed along its periphery a depressed step portion having a diameter smaller than an outer diameter of the drum, and the peeling claw is urged against said depressed portion.
Claim 4
Dependent Claim
22 words
An electrophotographic apparatus according to claim 1, further comprising spring means for urging resiliently the peeling claw against the conductive drum substrate.
Claim 5
Dependent Claim
20 words
An electrophotographic apparatus according to claim 1, wherein a free end of said peeling claw is formed as a fork.
Claim 6
Dependent Claim
20 words
An electrophotographic apparatus according to claim 1, wherein a free end of said peeling claw is formed as a stylus.
Claim 7
Dependent Claim
44 words
An electrophotographic apparatus according to claim 1, wherein said peeling claw comprises a peeling portion made of a strip and an electrical contact portion made of fork or stylus, free ends of which are bent in a direction of the rotation of the drum.
Claim 8
Dependent Claim
125 words
An electrophotographic apparatus according to claim 1, further comprising first and second side plates made of electrically insulating material such as plastics and secured to respective sides of the drum substrate, these side plates being formed integrally therewith first and second flanges, respectively extending in an axial direction of the drum; a guide tube connected between the first and second flanges; a stationary shaft arranged between first and second frames and removably inserted into said guide tube; and first and second bearing members made of insulating material such as plastics arranged between the first and second flanges and the stationary shaft, respectively; whereby the drum, first and second side plates, flanges and bearing members, and the guide tube are rotated relative to the stationary shaft.
Claim 9
Dependent Claim
29 words
An electrophotographic apparatus according to claim 7, wherein one of said frames has formed therein an aperture through which the drum assembly can be withdrawn in the axial direction.
Claim 10
Dependent Claim
80 words
An electrophotographic apparatus according to claim 8, wherein the first bearing member facing to said frame having the aperture is secured to the first flange, that the second bearing is so arranged on the stationary shaft that its axial movement is limited, but its rotational movement with respect to the shaft is allowed, and that the second bearing member and second flange have means for allowing relative movement in the axial direction, but limiting rotational movement relative to each other.
Claim 11
Dependent Claim
23 words
An electrophotographic apparatus according to claim 9, wherein said first flange and first bearing member are formed integrally with the first side plate.
Claim 12
Dependent Claim
41 words
An electrophotographic apparatus according to claim 8, wherein a coiled spring is arranged between the free end of the stationary shaft and the first bearing member so as to push the drum assembly in a direction opposite to the withdrawing direction.
References Cited (Backward Citations)
US3912256A
Cited
US4072307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |