US3740864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning device in an electrophotographic copying apparatus
Assignee: Canon Inc
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Filing: 1970-08-25
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Granted: 1973-06-26
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Expires: 1990-08-25
Abstract
Abstract An improved cleaning device for use with an electrophotographic copying apparatus especially of the image transfer type. The cleaning device provides a cleaning web turned into S-shaped rolls and movable into contact with and away from a photosensitive medium, whereby any residual toner present on the surface of the photosensitive member can be readily removed by both sides of the cleaning web to completely prevent the formation of ghost images during the repeated use of the photosensitive medium for the image reproduction. The cleaning web can be moved from one of the rolls to the other to remove used portions of the web from the cleaning position and supply fresh portions of the web in place thereof.
Inventors
- 👤 Y Ito
- 👤 H Katayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:21
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G21/0041
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
182 words
A cleaning device for use in an electrophotographic copying apparatus having a photosensitive medium on which an electrophotographic image is formed, comprising a cleaning web, two rolls disposed adjacent said photosensitive medium, said cleaning web being wound in the form of an S-shape between said two rolls, means for supporting said two rolls individually and pivotally whereby said two rolls are moveable to a cleaning position and at least one of said two rolls is also moveable to a non-cleaning position, means for urging said two rolls into contact with the surface of a photosensitive medium when in said cleaning position whereby said cleaning web cleans said photosensitive medium, means for moving at least said one of said two rolls from said cleaning position to said non-cleaning position to permit removal of a used portion of said cleaning web, and means associated with said one of two rolls for advancing said cleaning web to remove a used portion of said cleaning web and supply a fresh portion thereof when at least said one of said two rolls is in said non-cleaning position.
Claim 2
Dependent Claim
182 words
A cleaning device for use in an electrophotographic copying apparatus having a photosensitive medium on which an electrophotographic image is formed, comprising a cleaning web, two rolls disposed adjacent said photosensitive medium, said cleaning web being wound in the form of an S-shape between said two rolls, means for supporting said two rolls individually and pivotally whereby said two rolls are moveable to a cleaning position and at least one of said two rolls is also moveable to a non-cleaning position, means for urging said two rolls into contact with the surface of a photosensitive medium when in said cleaning position whereby said cleaning web cleans said photosensitive medium, means for moving at least said one of said two rolls from said cleaning position to said non-cleaning position to permit removal of a used portion of said cleaning web, and means associated with said one of two rolls for advancing said cleaning web to remove a used portion of said cleaning web and supply a fresh portion thereof when at least said one of said two rolls is in said non-cleaning position.
Claim 3
Dependent Claim
29 words
A cleaning device according to claim 1, wherein said urging means comprises springs provided to pull said two rolls in a direction toward the surface of said photosensitive medium.
Claim 4
Dependent Claim
20 words
A cleaning device according to claim 1, including means for maintaining said two rolls stationary when in said cleaning position.
Claim 5
Dependent Claim
68 words
A cleaning device according to claim 1, wherein said electrophotographic copying apparatus includes means for moving said photosensitive medium relative to said two rolls, wherein said two rolls comprise a web supply roll and a web take-up roll, and further including means for rotating said web supply roll in the same rotational direction as that of said photosensitive medium when said two rolls are in said cleaning position.
Claim 6
Dependent Claim
29 words
A cleaning device according to claim 4, wherein the used portion of said cleaning web is taken up when said web take-up roll is in said second non-cleaning position.
Claim 7
Dependent Claim
71 words
A cleaning device according to claim 4, wherein said web take-up roll includes means charged with a recovery force when said web supply roll is being rotated and said web take-up roll is in said cleaning position, for rotating said web take-up roll by the use of said recovery force when said web take-up roll is in said non-cleaning position whereby the used portion of said cleaning web is taken up.
Claim 8
Dependent Claim
35 words
A cleaning device according to claim 4, wherein the speed of movement of said web provided by said web supply roll is at or less than one-tenth of the peripheral speed of said photosensitive medium.
Claim 9
Dependent Claim
58 words
A cleaning device according to claim 1, wherein said moving means includes means for moving said two rolls to said non-cleaning position and said advancing means includes means for rotating said two rolls for taking up the used portion of said cleaning web and supplying a fresh portion thereof when said two rolls are in said non-cleaning position.
Claim 10
Dependent Claim
47 words
A cleaning device according to claim 1, further comprising means for restraining the rotation of at least one of said two rolls when in said cleaning position and means for releasing said restraining means upon movement of said one of said two rolls to said non-cleaning position.
Claim 11
Dependent Claim
49 words
A cleaning device according to claim 1, wherein said two rolls comprise a web supply roll and a web take-up roll and wherein said cleaning web is unwound from the bottom of said web-supply rolL adjacent said photosensitive medium to and around the top of said web take-up roll.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |