US4295443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing apparatus for electrostatic copying machine
Assignee: Toshiba Corp
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Filing: 1980-03-25
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Granted: 1981-10-20
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Expires: 2000-03-25
Abstract
Abstract A developing apparatus for developing an electrostatic image on an electrostatic image bearing member comprises a single component developer, a stationary developing roller adjacent the electrostatic image bearing member. The developing roller comprises an electrically conductive sleeve having a plurality of spaced apart channels on the surface of the conductive sleeve and an electrically conductive segment in each of the channels. The electrically conductive segments are insulated from the conductive sleeve by an insulator in each of the channels. A voltage source is connected between the conductive sleeve and the conductive segments for applying voltage to the developer to thereby charge the developer. The developer is then moved across the developing roller to the electrostatic image bearing member. The developer is evenly charged by the voltage source as it moves across the surface of the developing roller.
Inventors
- 👤 Mitsuaki Kohyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:21
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0914
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A developer apparatus for developing an electrostatic image on an electrostatic image bearing member, comprising: a single component developer; a stationary developing roller adjacent said electrostatic image bearing member, said developing roller comprising an electrically conductive sleeve having a plurality of spaced apart channels on the surface of said conductive sleeve, an electrically conductive segment in each of said channels and an insulator in each of said channels between said conductive sleeve and said electrically conductive segment; voltage means connected to said conductive sleeve and said conductive segments for applying voltage between said conductive sleeve and said conductive segments to charge the developer; and developer moving means for moving the developer across said developing roller to said electrostatic image bearing member.
Claim 2
Dependent Claim
121 words
A developer apparatus for developing an electrostatic image on an electrostatic image bearing member, comprising: a single component developer; a stationary developing roller adjacent said electrostatic image bearing member, said developing roller comprising an electrically conductive sleeve having a plurality of spaced apart channels on the surface of said conductive sleeve, an electrically conductive segment in each of said channels and an insulator in each of said channels between said conductive sleeve and said electrically conductive segment; voltage means connected to said conductive sleeve and said conductive segments for applying voltage between said conductive sleeve and said conductive segments to charge the developer; and developer moving means for moving the developer across said developing roller to said electrostatic image bearing member.
Claim 3
Dependent Claim
19 words
The developing apparatus of claim 1 further comprising bias voltage means for applying a DC voltage to said sleeve.
Claim 4
Dependent Claim
19 words
The developing apparatus of claim 1 further comprising bias voltage means for applying an AC voltage to said sleeve.
Claim 5
Dependent Claim
20 words
The developing apparatus of claim 1 further comprising bias voltage means for applying an AC voltage to said conductive segments.
Claim 6
Dependent Claim
21 words
The developing apparatus of claim 1 wherein said sleeve is electrically connected to a ground and faces said image bearing member.
Claim 7
Dependent Claim
121 words
A developing apparatus for developing an electrostatic image on an electrostatic image bearing member, comprising: a single component developer; a stationary developing roller adjacent said electrostatic image bearing member, said developing roller comprising non-magnetic sleeve having a plurality of spaced apart channels on the surface of said sleeve and an electrically conductive segment in each of said channels; voltage means having a first terminal connected to a first group of said conductive segments and a second terminal connected to a second group of said conductive segments for applying a voltage between said first and second groups of conductive segments to charge the developer; and developer moving means for moving the developer across said developing roller to said electrostatic image bearing member.
Claim 8
Dependent Claim
121 words
A developing apparatus for developing an electrostatic image on an electrostatic image bearing member, comprising: a single component developer; a stationary developing roller adjacent said electrostatic image bearing member, said developing roller comprising non-magnetic sleeve having a plurality of spaced apart channels on the surface of said sleeve and an electrically conductive segment in each of said channels; voltage means having a first terminal connected to a first group of said conductive segments and a second terminal connected to a second group of said conductive segments for applying a voltage between said first and second groups of conductive segments to charge the developer; and developer moving means for moving the developer across said developing roller to said electrostatic image bearing member.
Claim 9
Dependent Claim
30 words
The developer apparatus of claim 6 wherein at least one segment of a first group of said conductive segments is electrically connected to ground and faces said image bearing member.
Claim 10
Dependent Claim
34 words
The developing apparatus of claims 1 or 6 wherein said voltage means applies a DC voltage having a polarity opposite to the polarity of the electrostatic image formed on said electrostatic image bearing member.
Claim 11
Dependent Claim
43 words
The developing apparatus of claims 1 or 6 wherein said single component developer is a single component magnetic toner and said developer moving means comprises a cylindrical magnetic roller having a plurality of magnetic poles, said magnetic roller being rotatable within said sleeve.
References Cited (Backward Citations)
US4187330A
Cited
US4218691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |