US4288889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for drafting fibers
Assignee: Individual
•
Filing: 1979-09-05
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Granted: 1981-09-15
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Expires: 1999-09-05
Abstract
Abstract The invention contemplates a method for separating fibers fed in the form of fibrous material, wherein the material is pinched in the cross-section in such a manner that the pinching action is applied to fibers spaced from one another at a certain distance. Simultaneously, the velocity of fibrous material is substantially increased so that individual fibers are pulled out. An apparatus for carrying out the method comprises an outlet pair of rolls having an appropriately profiled cylindrical roll.
Inventors
- 👤 Valentin N. Tikhonov
- 👤 Vitaly I. Zhestkov
- 👤 Gennady N. Shlykov
- 👤 Vasily M. Diachkov
- 👤 Viktor M. Mukhin
- 👤 Gennady V. Zhigalov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:19
CPC Classifications
D; D01; D01H; D01H5/00; D01H5/18; D01H5/70; D01H5/74; D01H5/78
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
190 words
An apparatus for isolating fibers of a fibrous material and for feeding isolated fibers to a subsequent operation comprising: a feeding pair of rolls; and an outlet pair of rolls, the outlet pair of rolls including a cylindrical roll with a profiled peripheral surface and a pressure roll in contact with said cylindrical roll along generatrix lines to define a zone of pinching of the fibrous material for isolating individual fibers, linear velocity of said outlet pair of rolls being many times greater than the linear velocity of said feeding pair of rolls, and said profiled peripheral surface being formed by alternating spaced projections arranged at points of intersection of helical lines, one group of said helical lines including a plurality of parallel righthand helical lines, and another group of said helical lines including a plurality of parallel lefthand helical lines, the ratio of angles of inclination of these lines to the generatrix of the roll being from 1.0 to 1.8, and the spacing of the projections along the righthand helical lines being different from the spacing of the projections along the lefthand helical lines when the ratio is 1.0.
Claim 2
Independent Claim
190 words
An apparatus for isolating fibers of a fibrous material and for feeding isolated fibers to a subsequent operation comprising: a feeding pair of rolls; and an outlet pair of rolls, the outlet pair of rolls including a cylindrical roll with a profiled peripheral surface and a pressure roll in contact with said cylindrical roll along generatrix lines to define a zone of pinching of the fibrous material for isolating individual fibers, linear velocity of said outlet pair of rolls being many times greater than the linear velocity of said feeding pair of rolls, and said profiled peripheral surface being formed by alternating spaced projections arranged at points of intersection of helical lines, one group of said helical lines including a plurality of parallel righthand helical lines, and another group of said helical lines including a plurality of parallel lefthand helical lines, the ratio of angles of inclination of these lines to the generatrix of the roll being from 1.0 to 1.8, and the spacing of the projections along the righthand helical lines being different from the spacing of the projections along the lefthand helical lines when the ratio is 1.0.
Claim 3
Dependent Claim
39 words
An apparatus according to claim 1, wherein the distance between said projections which are in contact with said pressure roll and extend along one and the same generatrix line is of at least 200 times the thickness of fibers.
Claim 4
Dependent Claim
43 words
An apparatus according to claim 2, wherein the width of the part of the surface of said projection in contact with the fiber along said generatrix of the roll does not exceed 0.2 of the distance between the projections arranged along said generatrix.
Claim 5
Dependent Claim
20 words
An apparatus according to claim 1, wherein said angle of inclination of said helical lines ranges from 45° to 80°.
Claim 6
Dependent Claim
34 words
An apparatus according to claim 1, wherein the area of said projections in contact with the pressure roll ranges from 0.04 to 0.2 of the area of the cylindrical surface of said pressure roll.
References Cited (Backward Citations)
US709694A
Cited
US1994176A
Cited
FR1033490A
Cited
US2853847A
Cited
GB852449A
Cited
FR2189548A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |