US3679808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring yarn tension
Assignee: Akzona Inc
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Filing: 1970-06-30
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Granted: 1972-07-25
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Expires: 1990-06-30
Abstract
Abstract A method and apparatus for measuring yarn tension during highspeed transport of the yarn. The method involves engaging the running yarn with a pair of coupled torque-imparting rollers or similar yarn-contacting surfaces and electrically measuring the resulting torque which is proportional to the yarn tension. The apparatus is a torsion bar assembly with the two yarn-engaging rollers radially mounted on an arm connected by an axle to one end of the torsion bar with means to electrically measure the torque of the torsion bar produced by the yarn tension while the other end of the torsion bar is held in a fixed position by any suitable means.
Inventors
- 👤 Dieter Rohner
- 👤 Wolfgang Duhring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:47
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/04; B; B65; B65H; B65H59/00; B65H59/40; B65H2402/00; B65H2402/40; B65H2402/41; B65H2402/414; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
A method of measuring the tension of a transported yarn which comprises: aligning and engaging the yarn during its transport with a handheld coupled pair of torque-imparting yarn-contacting surfaces such that the yarn is directed from its normally linear path into a shallow S-curve path over one of said yarn-contacting surfaces and under the other of said yarn-contacting surfaces; mechanically transmitting the yarn tension exerted on said yarncontacting surfaces to a single torsion bar as a torque applied to said bar; and electrically measuring the resulting torque in said torsion bar with a wire strain gauge connected to said torsion bar so as to convert changes in the amount of applied torque into correspondingly proportional changes in electrical resistance, calibrated to indicate the tension in said yarn.
Claim 2
Independent Claim
127 words
A method of measuring the tension of a transported yarn which comprises: aligning and engaging the yarn during its transport with a handheld coupled pair of torque-imparting yarn-contacting surfaces such that the yarn is directed from its normally linear path into a shallow S-curve path over one of said yarn-contacting surfaces and under the other of said yarn-contacting surfaces; mechanically transmitting the yarn tension exerted on said yarncontacting surfaces to a single torsion bar as a torque applied to said bar; and electrically measuring the resulting torque in said torsion bar with a wire strain gauge connected to said torsion bar so as to convert changes in the amount of applied torque into correspondingly proportional changes in electrical resistance, calibrated to indicate the tension in said yarn.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1 in which the yarn is transported at a linear velocity above about 1,000 meters per minute.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1 in which the transported yarn is placed under a tension of more than about 1,000 kilograms.
Claim 5
Dependent Claim
22 words
A method as claimed in claim 3 in which the yarn has a total yarn size of at least 1 million dtex.
Claim 6
Independent Claim
120 words
An apparatus for measuring the tension of a transported yarn which comprises: a single elongated torsion bar; two coupled yarn-engaging means having substantially parallel axes spaced equidistantly and parallel to the axis of said torsion bar on a radially positioned supporting arm; means to rigidly connect said supporting arm at its midpoint between said yarn-engaging means to one end of said torsion bar; means to rigidly hand-hold the other end of said torsion bar in a substantially fixed position; and at least one wire strain gauge strip fastened to said torsion bar on a free portion of its circumference for measurement of the amount of torque imparted by the tension of a transported yarn in contact with said yarn-engaging means.
Claim 7
Independent Claim
120 words
An apparatus for measuring the tension of a transported yarn which comprises: a single elongated torsion bar; two coupled yarn-engaging means having substantially parallel axes spaced equidistantly and parallel to the axis of said torsion bar on a radially positioned supporting arm; means to rigidly connect said supporting arm at its midpoint between said yarn-engaging means to one end of said torsion bar; means to rigidly hand-hold the other end of said torsion bar in a substantially fixed position; and at least one wire strain gauge strip fastened to said torsion bar on a free portion of its circumference for measurement of the amount of torque imparted by the tension of a transported yarn in contact with said yarn-engaging means.
Claim 8
Dependent Claim
15 words
An apparatus as claimed in claim 5 wherein said torsion bar is composed of steel.
Claim 9
Dependent Claim
21 words
An apparatus as claimed in claim 5 wherein two coupled rollers as yarn-engaging means are rotatably mounted on said supporting arm.
Claim 10
Dependent Claim
34 words
An apparatus as claimed in claim 7 wherein each roller is rotatably supported at both ends by an arm including an axially extended member adjacent to each roller opposite the side of yarn engagement.
Claim 11
Dependent Claim
36 words
An apparatus as claimed in claim 5 wherein said means rigidly connecting and holding said torsion bar at either end consists of two axle members which are axially separated and joined solely by said torsion bar.
Claim 12
Dependent Claim
30 words
An apparatus as claimed in claim 9 wherein the axle member corresponding to said means rigidly holding said torsion bar in a substantially fixed position is provided with handle means.
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |