US4003334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer roller for electrostatic copier
Assignee: Speed O Print Business Machines Corp
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Filing: 1975-12-22
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Granted: 1977-01-18
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Expires: 1995-12-22
Abstract
Abstract An electrostatic photocopy machine of the type which uses a magnetic dry toner is disclosed, wherein the toner particles are magnetically attracted to the surface of a developer roller, and thereafter deposited onto the charged image areas on one surface of a copy sheet. The developer roller is provided with an outer shell which is electrically non-conductive, thereby producing improved results in the copy.
Inventors
- 👤 Abe Samuels
- 👤 Roger Wiggerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:23
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
In an electrostatic photocopy machine, wherein a single component magnetic toner material is collected on the surface of a developer roller from a source of said material and transferred to electrically charged image areas on the surface of a copy sheet moving in a plane adjacent thereto, an improved developer roller construction which comprises a shaft mounted for rotation, an axially extending magnetic core surrounding said shaft and divided into axially extending segments, wherein adjacent segments have opposite polarity, and producing a uniform magnetic field, and an outer shell surrounding said magnetic core in spacial relation thereto, said shell and core being rotatable relative to each other thereby to collect uniformly the single component toner material on the surface of said shell during rotation of one of said shell or core, said shell being electrically non-conductive, thereby to resist attack by chemicals in said toner which tend to create imperfections in the surface of said shell which cause poor reproduction of copies.
Claim 2
Dependent Claim
162 words
In an electrostatic photocopy machine, wherein a single component magnetic toner material is collected on the surface of a developer roller from a source of said material and transferred to electrically charged image areas on the surface of a copy sheet moving in a plane adjacent thereto, an improved developer roller construction which comprises a shaft mounted for rotation, an axially extending magnetic core surrounding said shaft and divided into axially extending segments, wherein adjacent segments have opposite polarity, and producing a uniform magnetic field, and an outer shell surrounding said magnetic core in spacial relation thereto, said shell and core being rotatable relative to each other thereby to collect uniformly the single component toner material on the surface of said shell during rotation of one of said shell or core, said shell being electrically non-conductive, thereby to resist attack by chemicals in said toner which tend to create imperfections in the surface of said shell which cause poor reproduction of copies.
Claim 3
Dependent Claim
40 words
The combination of elements defined in claim 1, wherein said shell is aluminum, and is made electrically non-conductive by anodizing and creating a hard surface of aluminum oxide on the outer surface thereof on which said toner material is collected.
Claim 4
Dependent Claim
33 words
The combination of elements defined in claim 1, wherein said shell is aluminum, and is made electrically non-conductive by anodizing and creating a hard surface of aluminum oxide on all external surfaces thereof.
Claim 5
Dependent Claim
24 words
The combination of elements defined in claim 1, wherein the entire body of said electrically non-conductive shell is formed of an electrically non-conductive material.
Claim 6
Dependent Claim
32 words
The combination of elements defined in claim 1, wherein said electrically non-conductive shell is formed of a moldable plastic material having sufficient thermosetting properties to resist deformation during operation of the machine.
Claim 7
Dependent Claim
31 words
The combination of elements defined in claim 1, wherein said electrically non-conductive shell is formed of a plastic material and has an outer covering thereon of an electrically nonconductive plastic material.
Claim 8
Dependent Claim
22 words
The combination of elements defined in claim 4, wherein said shell also includes an outer covering of an electrically nonconductive plastic material.
Claim 9
Dependent Claim
27 words
The combination of elements defined in claim 4, wherein said shell also includes an outer covering of heat shrinkable plastic material shrunk onto the outer surface thereof.
Claim 10
Dependent Claim
22 words
The combination of elements defined in claim 5, wherein said shell also includes an outer covering of an electrically non-conductive plastic material.
Claim 11
Dependent Claim
28 words
The combination of elements defined in claim 5, wherein said shell also includes an outer covering of a heat shrinkable plastic material shrunk onto the outer surface thereof.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |