US4488802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic device with single stations serving multiple functions
Assignee: Fujifilm Business Innovation Corp
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Filing: 1983-01-14
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Granted: 1984-12-18
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Expires: 2003-01-14
Abstract
Abstract An electrophotographing device for copying is small and inexpensive to manufacture due to the placement of multiple functions at single operating stations. A copying operation is carried out during two revolutions of a photo-sensitive member rather than one revolution as in the conventional copying operation.
Inventors
- 👤 Ryuzo Sunaga
- 👤 Seiji Joh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:08
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/28; G03G15/30; G03G15/307
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
An electrophotographing device for copying from an original onto a transfer sheet by charging, exposing, developing, transferring and cleaning, said device comprising: a photo-sensitive member arranged to revolve past operating stations during a copying operation, a developing and cleaning unit means located at one operating station for applying toner to said photo-sensitive member and for cleaning said photo-sensitive member during alternate revolutions of said photo-sensitive member, respectively, said developing and cleaning unit means having a wiper blade positioned therein to provide the cleaning operation of said copying operation, and a charging and transferring unit means located at another operating station for alternately carrying out the charging and transferring operations of said copying operation during alternate revolutions of said photo-sensitive member past said charging and transferring unit means, whereby said copying operation requires two revolutions of said photo-sensitive member.
Claim 2
Dependent Claim
138 words
An electrophotographing device for copying from an original onto a transfer sheet by charging, exposing, developing, transferring and cleaning, said device comprising: a photo-sensitive member arranged to revolve past operating stations during a copying operation, a developing and cleaning unit means located at one operating station for applying toner to said photo-sensitive member and for cleaning said photo-sensitive member during alternate revolutions of said photo-sensitive member, respectively, said developing and cleaning unit means having a wiper blade positioned therein to provide the cleaning operation of said copying operation, and a charging and transferring unit means located at another operating station for alternately carrying out the charging and transferring operations of said copying operation during alternate revolutions of said photo-sensitive member past said charging and transferring unit means, whereby said copying operation requires two revolutions of said photo-sensitive member.
Claim 3
Dependent Claim
26 words
An electrophotographing device as claimed in claim 1 wherein said wiper blade is arranged as a doctor blade with one end pressing against said photo-sensitive member.
Claim 4
Dependent Claim
24 words
An electrophotographing device as claimed in claim 1 wherein said photo-sensitive member is made of selenium and has a coating of zinc stearate thereon.
Claim 5
Dependent Claim
24 words
An electrophotographing device as claimed in claim 2 wherein said photo-sensitive member is made of selenium and has a coating of zinc stearate thereon.
Claim 6
Dependent Claim
67 words
An electrophotographing device as claimed in claim 2 wherein said developing and cleaning unit comprises a holding means for receiving and holding toner for application to said photo-sensitive member, and an application means for applying toner from said holding means to said photo-sensitive member, said wiper blade being positioned so that toner removed thereby from said photo-sensitive member falls along said wiper blade into said holding means.
Claim 7
Dependent Claim
24 words
An electrophotographing device as claimed in claim 5 wherein said photo-sensitive member is made of selenium and has a coating of zinc stearate thereon.
Claim 8
Independent Claim
105 words
A method of electrophotographing an original comprising the steps of: (a) revolving a photo-sensitive member for two revolutions; (b) charging said photo-sensitive member during said first revolution; (c) exposing said charged photo-sensitive member to an image of said original during the first revolution to form a latent image; (d) developing said latent image during said first revolution by applying toner to said photo-sensitive member; (e) transferring said developed image to transfer paper during the second revolution; (f) removing said latent image during said second revolution by exposing said photo-sensitive member to light; and (g) cleaning the toner from said photo-sensitive member during said second revolution.
Claim 9
Independent Claim
105 words
A method of electrophotographing an original comprising the steps of: (a) revolving a photo-sensitive member for two revolutions; (b) charging said photo-sensitive member during said first revolution; (c) exposing said charged photo-sensitive member to an image of said original during the first revolution to form a latent image; (d) developing said latent image during said first revolution by applying toner to said photo-sensitive member; (e) transferring said developed image to transfer paper during the second revolution; (f) removing said latent image during said second revolution by exposing said photo-sensitive member to light; and (g) cleaning the toner from said photo-sensitive member during said second revolution.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |