US3751216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuser roll assembly
Assignee: Xerox Corp
•
Filing: 1971-11-26
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Granted: 1973-08-07
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Expires: 1991-11-26
Abstract
Abstract A fuser roll assembly for use in a xerographic copying machine including a cylindrical roll formed of aluminum and having an electric heating element disposed along its longitudinal axis. A substantially cylindrical shell, formed of stainless steel, is slidably mounted about the roll when the heating element is deenergized; energization of the heating element causing said roll to diametrally expand so the outer surface of the roll firmly engages the inner surface of the shell.
Inventors
- 👤 P Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:14
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A fuser roll assembly for use in a xerographic copying machine, including: a cylindrical roll member of a first material having a first coefficient of thermal expansion and being mounted for rotation about its longitudinal axis, heating means disposed along the longitudinal axis of said roll member for supplying heat thereto, said heating means being energizable and de-energizable as desired to control the temperature of said roll member, a hollow cylindrical shell member of a second material having a second and lower coefficient of thermal expansion, said shell member being rotatably and translatably disposable around said roll member when said roll member is at room temperature and being securely engaged by said roll member when said rollmember is at operating temperature.
Claim 2
Dependent Claim
121 words
A fuser roll assembly for use in a xerographic copying machine, including: a cylindrical roll member of a first material having a first coefficient of thermal expansion and being mounted for rotation about its longitudinal axis, heating means disposed along the longitudinal axis of said roll member for supplying heat thereto, said heating means being energizable and de-energizable as desired to control the temperature of said roll member, a hollow cylindrical shell member of a second material having a second and lower coefficient of thermal expansion, said shell member being rotatably and translatably disposable around said roll member when said roll member is at room temperature and being securely engaged by said roll member when said rollmember is at operating temperature.
Claim 3
Dependent Claim
28 words
A fuser roll assembly as defined in claim 1 wherein said roll member is composed substantially of aluminum and said shell member is composed substantially of stainless steel.
Claim 4
Dependent Claim
21 words
The fuser roll assembly in accordance with claim 1 wherein said shell is provided with a coating of a flurocarbon resin.
Claim 5
Dependent Claim
97 words
A fuser roll assembly for use in a xerographic copying machine comprising: a generally cylindrical roll member formed of aluminum, heating means disposed along the longitudinal axis of said roll for supplying heat thereto, and a substantially cylindrical shell member formed of stainless steel and having a flurocarbon resin coating provided on its outer surface, said shell member being slidably mounted about said roll member when said heating means is deenergized, energization of said heating means causing said roll member to diametrally expand so the outer surface thereof firmly engages the inner surface of said shell member.
Claim 6
Dependent Claim
97 words
A fuser roll assembly for use in a xerographic copying machine comprising: a generally cylindrical roll member formed of aluminum, heating means disposed along the longitudinal axis of said roll for supplying heat thereto, and a substantially cylindrical shell member formed of stainless steel and having a flurocarbon resin coating provided on its outer surface, said shell member being slidably mounted about said roll member when said heating means is deenergized, energization of said heating means causing said roll member to diametrally expand so the outer surface thereof firmly engages the inner surface of said shell member.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |