US4843424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse developing image forming apparatus with disturbing means
Assignee: Toshiba Tec Corp
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Filing: 1987-12-29
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Granted: 1989-06-27
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Expires: 2007-12-29
Abstract
Abstract In an image forming apparatus according to the present invention, a cleaning device which allows for the repeated use of the photosensitive drum is removed from a space between a transferring device for transferring a visible image to the transfer sheet and a charging device for charging the photosensitive drum. The cleaning device is omitted from the image forming apparatus and a developing device for developing an electrostatic latent image can also serve as the cleaning device. Alternatively, the cleaning device is disposed between the charging device and the developing device.
Inventors
- 👤 Goro Oda
- 👤 Haruhiko Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
207 words
An image forming apparatus comprising a photosensitive member; charging means for uniformly electrostatically charging the photosensitive member and nay residual toner on said photosensitive member; exposure means for selectively exposing the electrostatically charged photosensitive member and said residual toner in accordance with data representative of an image, thereby forming an electrostatic latent image corresponding to said image on the photosensitive member; disturbing means for disturbing the residual toner on said photosensitive member; reverse developing means having a developing electrode for developing the latent image with toner, said developing means being provided adjacent to the surface of said photosensitive member for causing particles of said toner charged in the same polarity as the electrostatic latent image to adhere to said photosensitive member so as to form a toner image corresponding to the latent image on said photosensitive member and for causing particles of the disturbed residual toner on non-image portions of said photosensitive member which have been charged by said charging means and exposed by said exposure means to be attracted to said developing means to thereby simultaneously develop said latent image and clean said disturbed residual toner from said photosensitive member; and transfer means for transferring said toner image from said photosensitive member to a sheet-like medium.
Claim 2
Dependent Claim
207 words
An image forming apparatus comprising a photosensitive member; charging means for uniformly electrostatically charging the photosensitive member and nay residual toner on said photosensitive member; exposure means for selectively exposing the electrostatically charged photosensitive member and said residual toner in accordance with data representative of an image, thereby forming an electrostatic latent image corresponding to said image on the photosensitive member; disturbing means for disturbing the residual toner on said photosensitive member; reverse developing means having a developing electrode for developing the latent image with toner, said developing means being provided adjacent to the surface of said photosensitive member for causing particles of said toner charged in the same polarity as the electrostatic latent image to adhere to said photosensitive member so as to form a toner image corresponding to the latent image on said photosensitive member and for causing particles of the disturbed residual toner on non-image portions of said photosensitive member which have been charged by said charging means and exposed by said exposure means to be attracted to said developing means to thereby simultaneously develop said latent image and clean said disturbed residual toner from said photosensitive member; and transfer means for transferring said toner image from said photosensitive member to a sheet-like medium.
Claim 3
Dependent Claim
31 words
The image forming apparatus according to claim 1, wherein said disturbing means includes a disturbing member which is provided in sliding contact with the photosensitive member for disturbing the residual toner.
Claim 4
Dependent Claim
16 words
The image forming apparatus according to claim 2, wherein said disturbing member includes a fur brush.
Claim 5
Dependent Claim
23 words
The image forming apparatus according to claim 3, wherein said disturbing member includes a paper pipe around which said fur brush in provided.
Claim 6
Dependent Claim
15 words
The image forming apparatus according to claim 2, wherein said disturbing member includes a blade.
Claim 7
Dependent Claim
227 words
An image forming apparatus comprising: storing means for storing a sheet-like medium of a predetermined length; a photosensitive drum having a circumferential length shorter than said predetermined length; charging means for uniformly electrostatically charging the photosensitive drum and any residual toner on said photosensitive drum; exposure means for selectively exposing the electrostatically charged photosensitive drum and said residual toner in accordance with data representative of an image, thereby forming an electrostatic latent image corresponding to said image on the photosensitive drum; disturbing means for disturbing the residual toner on said photosensitive drum; reverse developing means having a developing electrode for developing the latent image with toner, said developing means being provided adjacent to the surface of said photosensitive drum for causing particles of said toner charged in the same polarity as the electrostatic latent image to adhere to said photosensitive drum so as to form a toner image corresponding to the latent image on said photosensitive drum and for causing particles of the disturbed residual toner on non-image portions of said photosensitive drum which have been charged by said charging means and exposed by said exposure means to be attracted to said developing means to thereby simultaneously develop said latent image and clean said disturbed residual toner from said photosensitive drum; and transfer means for transferring said toner image from said photosensitive drum to the sheet-like medium.
Claim 8
Dependent Claim
227 words
An image forming apparatus comprising: storing means for storing a sheet-like medium of a predetermined length; a photosensitive drum having a circumferential length shorter than said predetermined length; charging means for uniformly electrostatically charging the photosensitive drum and any residual toner on said photosensitive drum; exposure means for selectively exposing the electrostatically charged photosensitive drum and said residual toner in accordance with data representative of an image, thereby forming an electrostatic latent image corresponding to said image on the photosensitive drum; disturbing means for disturbing the residual toner on said photosensitive drum; reverse developing means having a developing electrode for developing the latent image with toner, said developing means being provided adjacent to the surface of said photosensitive drum for causing particles of said toner charged in the same polarity as the electrostatic latent image to adhere to said photosensitive drum so as to form a toner image corresponding to the latent image on said photosensitive drum and for causing particles of the disturbed residual toner on non-image portions of said photosensitive drum which have been charged by said charging means and exposed by said exposure means to be attracted to said developing means to thereby simultaneously develop said latent image and clean said disturbed residual toner from said photosensitive drum; and transfer means for transferring said toner image from said photosensitive drum to the sheet-like medium.
Claim 9
Dependent Claim
31 words
The image forming apparatus according to claim 6, wherein said disturbing means includes a disturbing member which is provided in sliding contact with the photosensitive member for disturbing the residual toner.
Claim 10
Dependent Claim
16 words
The image forming apparatus according to claim 7, wherein said disturbing member includes a fur brush.
Claim 11
Dependent Claim
23 words
The image forming apparatus according to claim 8, wherein said disturbing member includes a paper pipe around which said fur blush is provided.
Claim 12
Dependent Claim
15 words
The image forming appartus according to claim 7, wherein said disturbing member includes a blade.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |