US4664504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus
Assignee: Toshiba Corp
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Filing: 1984-01-18
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Granted: 1987-05-12
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Expires: 2004-01-18
Abstract
Abstract In an image forming apparatus according to the present invention, a cleaning device which allows for the repeated use of an 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 23:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
An image forming apparatus comprising: an image carrier mounted for rotation in a predetermined direction; charging means for charging the image carrier; exposure means for exposing the charged image carrier, to form a latent image thereon; developing means for developing the latent image on the image carrier, via a developing agent; transfer means for transferring the developed image onto a sheet-like material; and cleaning means for removing the residual developing agent remaining on the image carrier after transfer, said cleaning means being disposed between said exposure means and said developing means such that during the rotation of said image carrier in said predetermined direction the image carrier encounters said exposure means, said cleaning means and said developing means in the stated order; said image carrier being disposed to stop when a jamming of the sheet-like material occurs, and restart and rotate for a predetermined distance after the jamming of the sheet-like material is cleared in order for said developing means to remove the residual developing agent remaining on the image carrier after said jamming occurs.
Claim 2
Dependent Claim
175 words
An image forming apparatus comprising: an image carrier mounted for rotation in a predetermined direction; charging means for charging the image carrier; exposure means for exposing the charged image carrier, to form a latent image thereon; developing means for developing the latent image on the image carrier, via a developing agent; transfer means for transferring the developed image onto a sheet-like material; and cleaning means for removing the residual developing agent remaining on the image carrier after transfer, said cleaning means being disposed between said exposure means and said developing means such that during the rotation of said image carrier in said predetermined direction the image carrier encounters said exposure means, said cleaning means and said developing means in the stated order; said image carrier being disposed to stop when a jamming of the sheet-like material occurs, and restart and rotate for a predetermined distance after the jamming of the sheet-like material is cleared in order for said developing means to remove the residual developing agent remaining on the image carrier after said jamming occurs.
Claim 3
Dependent Claim
18 words
The apparatus according to claim 1, wherein said developing means comprises a developing unit of a reverse-development system.
Claim 4
Dependent Claim
22 words
The apparatus according to claim 1, wherein said charging means is operated when said image carrier is rotated by the predetermined distance.
Claim 5
Dependent Claim
22 words
The apparatus according to claim 1, wherein said discharging means is operated when said image carrier is rotated by the predetermined distance.
Claim 6
Dependent Claim
24 words
The apparatus according to claim 1, wherein said cleaning means comprises a fur brush which is brought into sliding contact with said image carrier.
Claim 7
Dependent Claim
24 words
The apparatus according to claim 1, wherein said cleaning means comprises a cleaning blade which is brought into sliding contact with said image carrier.
Claim 8
Dependent Claim
33 words
The apparatus according to claim 1, wherein said cleaning means comprises a roller which is so disposed as to be spaced apart from said image carrier, with said roller generating a magnetic field.
References Cited (Backward Citations)
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |