US3842582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for imparting twist to filamentary material
Assignee: Leesona Corp
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Filing: 1972-12-18
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Granted: 1974-10-22
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Expires: 1992-12-18
Abstract
Abstract A novel process and apparatus for twisting filamentary material such as yarn is disclosed wherein yarn is twisted down stream of a heating means and intermediate of take-up and feed stations. Opposite sides of the yarn are contacted at successive points therealong thus gripping the yarn while both an advancing and rolling motion is imparted thereto. Such motion is imparted to the yarn in one physical embodiment of the invention by means of a pair of rolls provided with meshed teeth formed along circumferential surfaces thereof. The rolls in such embodiment are mounted in angular relationship to each other so as to permit the teeth of respective rolls to engage opposite sides of a filamentary piece of material passing between said rolls at opposite sides and at successive points therealong. Such contact along successive opposite portions of the yarn causes the yarn to take a continuous and essentially stable path between the rolls and enables a positive grip to be imparted to the yarn thereby overcoming the torque imparted to the yarn as a frictional twist component of the meshed teeth. The apparatus of the present invention may thus be characterized as a friction twist head and its method of operation a process for imparting false twist to filamentary material by frictional contact.
Inventors
- 👤 H Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:06
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
217 words
Apparatus for imparting twist to filamentary material comprising: a pair of members, each of said members provided with parallel projections along a surface thereof, a section of each of said member surfaces adjacent to and in partial overlapping relationship to each other to define an area of overlap between said member surfaces whereby projections of each member are in meshed interdigitative relationship with each other within a portion of said overlapping area, said projections being spaced apart from each other at their points of closest opposition by a distance at least equal to the thickness of said filamentary material, said portion defining a zone of filamentary contact, and a plurality of said projections contacting said filamentary material at spaced location on opposite sides thereof within said zone, means for directing filamentary material across said projections and generally normal thereto within said zone and means for moving said member surfaces through said zone, said member surfaces further being disposed to each other so that planes respectively disposed normal to the direction of travel of each said member surface through said zone are disposed in nonparallel angular relationship to each other and the projections of each of said members in angular relation to the respective plane normal to the direction of travel of the surface of its respective member.
Claim 2
Dependent Claim
217 words
Apparatus for imparting twist to filamentary material comprising: a pair of members, each of said members provided with parallel projections along a surface thereof, a section of each of said member surfaces adjacent to and in partial overlapping relationship to each other to define an area of overlap between said member surfaces whereby projections of each member are in meshed interdigitative relationship with each other within a portion of said overlapping area, said projections being spaced apart from each other at their points of closest opposition by a distance at least equal to the thickness of said filamentary material, said portion defining a zone of filamentary contact, and a plurality of said projections contacting said filamentary material at spaced location on opposite sides thereof within said zone, means for directing filamentary material across said projections and generally normal thereto within said zone and means for moving said member surfaces through said zone, said member surfaces further being disposed to each other so that planes respectively disposed normal to the direction of travel of each said member surface through said zone are disposed in nonparallel angular relationship to each other and the projections of each of said members in angular relation to the respective plane normal to the direction of travel of the surface of its respective member.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein said projections are equidistant and including means driving said members at equal surface speeds.
Claim 4
Dependent Claim
10 words
The apparatus of claim 1 wherein said members are rolls.
Claim 5
Dependent Claim
10 words
The apparatus of claim 1 wherein said members are belts.
Claim 6
Dependent Claim
13 words
Apparatus of claim 1 wherein the surface of each said projection is hyperbolic.
Claim 7
Dependent Claim
139 words
Apparatus for imparting twist to filamentary material comprising a pair of rolls, said rolls mounted with the longitudinal axis of each roll in non-parallel angular relationship to each other, the circumferential surface of each of said rolls provided with equidistant parallel teeth projecting therefrom and in angular relation to the axis of each said roll, thE teeth of one said roll meshed in non contacting relationship with the teeth of the other of said rolls, said teeth being spaced apart from each other at their points of closest opposition by a distance slightly greater than the thickness of said filamentary material means for directing filamentary material across said teeth and generally normal thereto a plurality of said teeth contacting said filamentary material at spaced locations on opposite sides thereof, and means for driving said rolls at equal surface speeds.
Claim 8
Dependent Claim
139 words
Apparatus for imparting twist to filamentary material comprising a pair of rolls, said rolls mounted with the longitudinal axis of each roll in non-parallel angular relationship to each other, the circumferential surface of each of said rolls provided with equidistant parallel teeth projecting therefrom and in angular relation to the axis of each said roll, thE teeth of one said roll meshed in non contacting relationship with the teeth of the other of said rolls, said teeth being spaced apart from each other at their points of closest opposition by a distance slightly greater than the thickness of said filamentary material means for directing filamentary material across said teeth and generally normal thereto a plurality of said teeth contacting said filamentary material at spaced locations on opposite sides thereof, and means for driving said rolls at equal surface speeds.
Claim 9
Dependent Claim
15 words
Apparatus of claim 6 wherein said teeth are equiangularly disposed in relation to said rolls.
Claim 10
Dependent Claim
96 words
A process for imparting twist to filamentary material comprising directing said filamentary material into a zone comprising opposed surfaces spaced apart from each other at their points of closest opposition by a distance slightly greater than the thickness of said filamentary material, contacting said filamentary material in said zone solely at a plurality of spaced locations on opposite sides thereof, and rolling said filamentary material by contact with said opposed surfaces to simultaneously impart circumferential and axial direction force components thereto so as to simultaneously advance said filamentary material through said zone while imparting twist thereto.
Claim 11
Dependent Claim
96 words
A process for imparting twist to filamentary material comprising directing said filamentary material into a zone comprising opposed surfaces spaced apart from each other at their points of closest opposition by a distance slightly greater than the thickness of said filamentary material, contacting said filamentary material in said zone solely at a plurality of spaced locations on opposite sides thereof, and rolling said filamentary material by contact with said opposed surfaces to simultaneously impart circumferential and axial direction force components thereto so as to simultaneously advance said filamentary material through said zone while imparting twist thereto.
Claim 12
Dependent Claim
17 words
The process of claim 8 wherein the path of said filamentary material in said zone is sinuous.
Claim 13
Dependent Claim
23 words
The process of claim 8 wherein said opposed surfaces are in meshed interdigitive relationship to each other during contact with said filamentary material.
Claim 14
Dependent Claim
29 words
The process of claim 8 wherein said opposed surfaces are in meshed interdigitive relationship to each other in said zone and wherein said surfaces cumulatively grip said filamentary material.
Claim 15
Dependent Claim
62 words
The process of claim 11 wherein said filamentary material is fed to said zone by feed and take-up means respectively upstream and downstream of said zone at a first rate and wherein said first rate is greater than the advancement rate imparted by said axial force component but not great enough to cause frictional slip between said filamentary material and said surfaces.
Claim 16
Dependent Claim
54 words
The process of claim 8 wherein said filamentary material is fed to said zone by feed and take-up means respectively upstream and downstream of said zone at a first rate and wherein the advancement rate said axial force component imparts to said filamentary material in said zone is substantially equal to said first rate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |