US4809036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic image apparatus utilizing distortion free development means
Assignee: Toshiba Corp
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Filing: 1987-10-19
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Granted: 1989-02-28
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Expires: 2007-10-19
Abstract
Abstract A developing apparatus is disclosed which includes a rotatable development sleeve which carries a non-magnetic one-constituent toner on a surface thereof. When the development sleeve rotates, the toner thereon is transferred to an electrostatic latent image, an elastic blade being urged against the surface of the development sleeve, to ensure that the layer of toner thereon is of uniform thickness. The interior of the development sleeve has a ribbed structure which provides additional structural rigidity.
Inventors
- 👤 Mitsuo Yamashita
- 👤 Shinji Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:37
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0818
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A developing apparatus comprising: movable developing means carrying a developing agent on its surface and adapted to transfer, during its movement, the developing agent to a photosensitive drum, thereby to form an electrostatic latent image, said movable development means being supported for rotation by a shaft in the center thereof; layer-forming means adapted to press the developing agent against the surface of said developing means, to form a layer of developing agent thereon said movable developing means being positioned a predetermined distance from said photosensitive drum, said photosensitive drum and said layer forming means being located oppositely each other in relation to said movable developing means, the shaft of said movable developing means positioned therebetween; and rigidity-adding means provided relative to the rear surface of said developing means, to endow said developing means with additional structural strength.
Claim 2
Dependent Claim
137 words
A developing apparatus comprising: movable developing means carrying a developing agent on its surface and adapted to transfer, during its movement, the developing agent to a photosensitive drum, thereby to form an electrostatic latent image, said movable development means being supported for rotation by a shaft in the center thereof; layer-forming means adapted to press the developing agent against the surface of said developing means, to form a layer of developing agent thereon said movable developing means being positioned a predetermined distance from said photosensitive drum, said photosensitive drum and said layer forming means being located oppositely each other in relation to said movable developing means, the shaft of said movable developing means positioned therebetween; and rigidity-adding means provided relative to the rear surface of said developing means, to endow said developing means with additional structural strength.
Claim 3
Dependent Claim
15 words
The developing apparatus according to claim 1, wherein said developing means including a cylindrical sleeve.
Claim 4
Dependent Claim
19 words
The developing apparatus according to claim 2, wherein said rigidity-adding means including a ribbed structure inside said cylindrical sleeve.
Claim 5
Dependent Claim
18 words
The developing apparatus according to claim 3, wherein said rib structure is formed integrally with said cylindrical sleeve.
Claim 6
Dependent Claim
20 words
The developing apparatus according to claim 4, wherein said sleeve and said rib structure are formed of an extrusion-molded aluminum.
Claim 7
Dependent Claim
30 words
The developing apparatus according to claim 2, wherein said rigidity-adding means is so formed that the ribs of said ribbed structure extend radially from the longitudinal axis of said sleeve.
Claim 8
Dependent Claim
21 words
The developing apparatus according to claim 2, wherein said rigidity-adding means is formed continuously along the axial direction of said sleeve.
Claim 9
Dependent Claim
24 words
The developing apparatus according to claim 1, wherein said developing means transfers said developing agent to an electrostatic latent image in a non-contact fashion.
Claim 10
Dependent Claim
82 words
A developing apparatus comprising: movable developing means carrying a developing agent on its surface and adapted to transfer, during its movement, the developing agent to a device for forming an electrostatic latent image; layer-forming means adapted to press said developing agent against the surface of said developing means, to form a layer of developing agent thereon, while triboelectrically charging the developing agent; and rigidity-adding means provided on the rear surface of said developing means to endow said developing means with structural strength.
Claim 11
Dependent Claim
82 words
A developing apparatus comprising: movable developing means carrying a developing agent on its surface and adapted to transfer, during its movement, the developing agent to a device for forming an electrostatic latent image; layer-forming means adapted to press said developing agent against the surface of said developing means, to form a layer of developing agent thereon, while triboelectrically charging the developing agent; and rigidity-adding means provided on the rear surface of said developing means to endow said developing means with structural strength.
Claim 12
Dependent Claim
16 words
The developing apparatus according to claim 9, wherein said developing agent is a nonmagnetic one-component toner.
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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) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |