Patent US3804401A successfully refreshed from Google Patents.
US3804401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic stripping apparatus
Assignee: Xerox Corp
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Filing: 1972-10-30
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Granted: 1974-04-16
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Expires: 1992-10-30
Abstract
Abstract This invention relates to an apparatus for stripping copy sheets bearing developed electrostatic images from the surface of a photoreceptor drum member, in which the stripping member is supported on a cushion of air so as not to contact the drum surface during the stripping operation. A stripping member is formed with a wedge portion member positioned adjacent to the drum surface to affect stripping of the paper from the drum surface. A stripping member is formed with a plenum channel with the bottom thereof, and is in communication with a source of air that effects an air cushion formed between a stripping member and a drum surface. Air channels are formed at the leading edge of the stripping member to direct air in the vicinity of the leading edge of the copy sheet to facilitate lifting of the copy sheet off the drum surface. In another embodiment, air channels are formed in the face of the wedge portion to assist in separating the copy sheet from the drum surface after it has been initially stripped. The stripping member is loaded against the photoreceptor drum member by a gimbal spring which allows the stripping member to maintain a constant relationship to the photoreceptor under conditions of runout or eccentricity of the photoreceptor while operating under dynamic conditions.
Inventors
- 👤 K Stange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; Y; Y10; Y10S; Y10S271/00; Y10S271/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
Apparatus for stripping copy sheets bearing developed electrostatic images from a xerographic surface in the shape of a drum comprising; a frame, a stripping member supported from said frame on resilient mounting means in close proximity to a xerographic drum at a distance from said xerographic drum less than the thickness of copy sheets bearing developed images to be stripped, said stripping member having a wedge portion positioned adjacent to the drum path and being formed with a plenum chamber on the bottom thereof, air supply means to provide low pressurized air in communication with said plenum chamber to effect formation of an air cushion between said stripping member and the drum surface acting against said resilient mounting means to maintain a predetermined uniform spacing therebetween while the wedge portion strips the leading edge of each copy sheet from the drum surface without destroying the developed images on the copy sheets.
Claim 2
Dependent Claim
151 words
Apparatus for stripping copy sheets bearing developed electrostatic images from a xerographic surface in the shape of a drum comprising; a frame, a stripping member supported from said frame on resilient mounting means in close proximity to a xerographic drum at a distance from said xerographic drum less than the thickness of copy sheets bearing developed images to be stripped, said stripping member having a wedge portion positioned adjacent to the drum path and being formed with a plenum chamber on the bottom thereof, air supply means to provide low pressurized air in communication with said plenum chamber to effect formation of an air cushion between said stripping member and the drum surface acting against said resilient mounting means to maintain a predetermined uniform spacing therebetween while the wedge portion strips the leading edge of each copy sheet from the drum surface without destroying the developed images on the copy sheets.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1 wherein said plenum chamber is formed with plurality of channels at the leading end thereof.
Claim 4
Dependent Claim
19 words
Apparatus according to claim 1 wherein guide members are positioned on said stripping member to assist in sheet separation.
Claim 5
Dependent Claim
46 words
Apparatus according to claim 1 wherein said wedge portion is formed with a plurality of conduits in communication with the air supply to exert an air force against the leading edge of each copy sheet as it is moved along the surface of the wedge portion.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 1 wherein said frame is pivotally mounted for loading and unloading of said stripping member into stripping position.
Claim 7
Dependent Claim
174 words
Apparatus for stripping copy sheets bearing developed electrostatic images from a xerographic surface in the shape of a drum comprising; a frame, a stripping member supported by said frame in close proximity to a xerographic drum at a distance from said xerographic drum less than the thickness of copy sheets bearing developed images to be stripped, said stripping member having a wedge portion positioned adjacent to the drum path and being formed with a plenum chamber on the bottom thereof, air supply means in communication with said plenum chamber to effect formation on an air cushion between said stripping member and the drum surface to maintain a predetermined spacing thereabove, while the wedge portion strips the leading edge of each copy sheet from the drum surface without destroying the developed images on the copy sheets, wherein said frame is pivotally mounted for loading and unloading of said stripping member into stripping position, wherein said frame includes a gimbal spring to maintain constant relationship of stripping member and drum surface for stripping subsequent copy sheet.
Claim 8
Dependent Claim
174 words
Apparatus for stripping copy sheets bearing developed electrostatic images from a xerographic surface in the shape of a drum comprising; a frame, a stripping member supported by said frame in close proximity to a xerographic drum at a distance from said xerographic drum less than the thickness of copy sheets bearing developed images to be stripped, said stripping member having a wedge portion positioned adjacent to the drum path and being formed with a plenum chamber on the bottom thereof, air supply means in communication with said plenum chamber to effect formation on an air cushion between said stripping member and the drum surface to maintain a predetermined spacing thereabove, while the wedge portion strips the leading edge of each copy sheet from the drum surface without destroying the developed images on the copy sheets, wherein said frame is pivotally mounted for loading and unloading of said stripping member into stripping position, wherein said frame includes a gimbal spring to maintain constant relationship of stripping member and drum surface for stripping subsequent copy sheet.
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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |