Patent US4291505A successfully refreshed from Google Patents.
US4291505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing negative-crowned roller
Assignee: Canon Inc
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Filing: 1979-09-26
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Granted: 1981-09-29
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Expires: 1999-09-26
Abstract
Abstract The disclosure provides a process for producing a negative-crowned roller having a progressively decreasing diameter from both ends toward the center thereof by means of a one-dimensional mutual displacement between the raw material of the roller and the shaping tool.
Inventors
- 👤 Shinnosuke Taniishi
- 👤 Tsukasa Kuge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:27
CPC Classifications
B; B24; B24B; B24B5/00; B24B5/02; B24B5/16; B24B5/167
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
A process for producing a negative-crowned roller, which comprises: maintaining a grinding tool in contact with a cylindrical-form material to be ground; maintaining said material in rotation; and linearly displacing said grinding tool relative to said material to be ground along a direction inclined with respect to the rotary axis of said material to be ground to produce the negative crowned roller surface thereon.
Claim 2
Dependent Claim
64 words
A process for producing a negative-crowned roller, which comprises: maintaining a grinding tool in contact with a cylindrical-form material to be ground; maintaining said material in rotation; and linearly displacing said grinding tool relative to said material to be ground along a direction inclined with respect to the rotary axis of said material to be ground to produce the negative crowned roller surface thereon.
Claim 3
Dependent Claim
30 words
A process according to claim 1, wherein said grinding tool is provided with a grinding portion of a length shorter than the length of the negative-crowned roller to be formed.
Claim 4
Dependent Claim
30 words
A process according to claim 1, wherein said grinding tool is formed as a roller and is maintained in rotation while in said contact with said material to be ground.
Claim 5
Dependent Claim
24 words
A process according to claim 3, wherein the rotary axis of said grinding tool is aligned in the direction of said relative linear displacement.
Claim 6
Dependent Claim
82 words
A process for producing a negative-crowned roller, which comprises: maintaining a grinding tool provided with a linear grinding portion in contact with a cylindrical-form material to be ground in such a manner that the rotary axis thereof is inclined with respect to the linear direction of said tool; maintaining said material to be ground in rotation; and linearly displacing said grinding tool relative to said material to be ground along the radial direction thereof to produce the negative crowned roller surface thereon.
Claim 7
Dependent Claim
82 words
A process for producing a negative-crowned roller, which comprises: maintaining a grinding tool provided with a linear grinding portion in contact with a cylindrical-form material to be ground in such a manner that the rotary axis thereof is inclined with respect to the linear direction of said tool; maintaining said material to be ground in rotation; and linearly displacing said grinding tool relative to said material to be ground along the radial direction thereof to produce the negative crowned roller surface thereon.
Claim 8
Dependent Claim
26 words
A process according to claim 5, wherein said grinding tool is provided with a length longer than the length of the negative-crowned roller to be formed.
Claim 9
Dependent Claim
33 words
A process according to claim 6, wherein said grinding tool is a roller of a straight cylindrical form and is maintained in rotation while in said contact with the material to be ground.
Claim 10
Dependent Claim
19 words
A process according to claim 3, 4, or 7, wherein said material to be ground is a rubber roller.
Claim 11
Dependent Claim
26 words
A process according to claim 3, 4, 5 or 7 for producing a negative-crowned roller wherein said material comprises a material for fixing a toner image.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |