Patent US4648054A successfully refreshed from Google Patents.
US4648054A
Expired / Lapsed
US
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Continuous measurement of yarn diameter and twist
Assignee: Unisearch Ltd
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Filing: 1984-06-20
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Granted: 1987-03-03
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Expires: 2004-06-20
Abstract
Abstract A yarn twist measurement device having a freely rotatable disc with its axis parallel to the axis of a travelling yarn. The disc being rotated by the surface twist of the yarn in contact with the circumference of the disc as the yarn travels past the disc. By measuring the circumferential displacement of the disc and the corresponding linear translation of the yarn, the amount of twist on the surface of the yarn can be calculated.
Inventors
- 👤 Boshra D. Farah
- 👤 Jae L. Woo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:55
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/12; G01B7/125; D; D01; D01H; D01H13/00; D01H13/32; G01B11/00; G01B11/08; G01B11/10; G01B11/105; G01B7/02; G01B7/06; G01B7/08; G01B7/087
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
87 words
A method of determining the surface twist angle of a translating yarn comprising, during a predetermined period of time, measuring the displacement of a circumference of a freely rotatable circular disc in contact with the translating yarn, said disc being oriented with its axis parallel to the axis of the yarn at the point of contact between the yarn the disc, measuring the linear translation of the yarn past the disc and calculating the surface twist angle of the yarn from the ratio between the two measurements.
Claim 2
Independent Claim
87 words
A method of determining the surface twist angle of a translating yarn comprising, during a predetermined period of time, measuring the displacement of a circumference of a freely rotatable circular disc in contact with the translating yarn, said disc being oriented with its axis parallel to the axis of the yarn at the point of contact between the yarn the disc, measuring the linear translation of the yarn past the disc and calculating the surface twist angle of the yarn from the ratio between the two measurements.
Claim 3
Dependent Claim
31 words
A method as claimed in claim 1 wherein the linear translation of the yarn is determined by measuring the circumferential displacement of a further disc over which the translating yarn travels.
Claim 4
Dependent Claim
31 words
A method as claimed in claim 1 wherein the linear translation of the yarn is determined by measuring the circumferential displacement of a guide roller over which the translating yarn travels.
Claim 5
Dependent Claim
109 words
Apparatus for measuring the surface twist angle of a travelling yarn comprising means for measuring the linear translation of the yarn, and means for measuring a displacement of the circumference of a freely rotatable circular disc mounted to be in contact with the travelling yarn, and having its axis of rotation substantially parallel to the axis of the yarn at the point of contact between the circumference of the disc and the yarn, such that the motion of the yarn surface imparts rotational force to the disc whereby the displacement of the circumference of the disc relative to the translation of the yarn corresponds to said surface twist angle.
Claim 6
Dependent Claim
109 words
Apparatus for measuring the surface twist angle of a travelling yarn comprising means for measuring the linear translation of the yarn, and means for measuring a displacement of the circumference of a freely rotatable circular disc mounted to be in contact with the travelling yarn, and having its axis of rotation substantially parallel to the axis of the yarn at the point of contact between the circumference of the disc and the yarn, such that the motion of the yarn surface imparts rotational force to the disc whereby the displacement of the circumference of the disc relative to the translation of the yarn corresponds to said surface twist angle.
Claim 7
Dependent Claim
50 words
Apparatus as claimed in claim 4 wherein the means for measuring the translation of the yarn comprises a further circular disc around a circumferential portion of which the yarn travels so as to rotate said further disc, and means for measuring the displacement of the circumference of said further disc.
Claim 8
Dependent Claim
28 words
Apparatus as claimed in claim 5 wherein the respective means for measuring the displacement of the circumference of each of said discs comprises a rotational speed sensing element.
Claim 9
Dependent Claim
18 words
Apparatus as claimed in claim 6 wherein each rotational speed sensing element comprises an opto coupler and reflectors.
Claim 10
Dependent Claim
16 words
Apparatus as claimed in claim 6 wherein each rotational speed sensing element comprises a shaft encoder.
Claim 11
Dependent Claim
47 words
Apparatus as claimed in claim 4 wherein the means for measuring the translation of the yarn comprises a further roller around a circumferential portion of which the yarn travels so as to rotate said roller, and means for measuring the displacement of the circumference of said roller.
Claim 12
Dependent Claim
30 words
Apparatus as claimed in claim 9 wherein the means for measuring the respective displacements of the circumferences of said disc and said roller each comprise a rotational speed sensing element.
Claim 13
Dependent Claim
18 words
Apparatus as claimed in claim 10 wherein each rotational speed sensing element comprises an opto coupler and reflectors.
Claim 14
Dependent Claim
16 words
Apparatus as claimed in claim 10 wherein each rotational speed sensing element comprises a shaft encoder.
Claim 15
Independent Claim
198 words
A system for measuring surface twist angle and diameter of a travelling yarn comprising means for measuring the linear translation of the yarn, and means for measuring the displacement of a circumference of a freely rotatable circular disc mounted to be in contact with the travelling yarn, and having its axis of rotation substantially parallel to the axis of the yarn at the point of contact between the circumference of the disc and the yarn, such that the motion of the yarn surface imparts rotational force to the disc whereby the displacement of the circumference of the disc relative to the translation of the yarn corresponds to said surface twist angle, and photoelectric means and a light source positioned on opposite sides of the travelling yarn such that the output of the photoelectric means varies in accordance with changes in diameter of the yarn and, a further light source and further photoelectric means with a reference yarn therebetween such that the output of said further photoelectric means corresponds to the diameter of the reference yarn, and means for comparing the outputs of said photoelectric means as a measure of the relative diameters of said travelling and reference yarns.
Claim 16
Independent Claim
198 words
A system for measuring surface twist angle and diameter of a travelling yarn comprising means for measuring the linear translation of the yarn, and means for measuring the displacement of a circumference of a freely rotatable circular disc mounted to be in contact with the travelling yarn, and having its axis of rotation substantially parallel to the axis of the yarn at the point of contact between the circumference of the disc and the yarn, such that the motion of the yarn surface imparts rotational force to the disc whereby the displacement of the circumference of the disc relative to the translation of the yarn corresponds to said surface twist angle, and photoelectric means and a light source positioned on opposite sides of the travelling yarn such that the output of the photoelectric means varies in accordance with changes in diameter of the yarn and, a further light source and further photoelectric means with a reference yarn therebetween such that the output of said further photoelectric means corresponds to the diameter of the reference yarn, and means for comparing the outputs of said photoelectric means as a measure of the relative diameters of said travelling and reference yarns.
Claim 17
Dependent Claim
94 words
A system as claimed in claim 13 in combination with yarn drafting means and twist insertion means wherein yarn formed by the drafting and twist insertion means passes through said system for measuring surface twist angle and diameter to calculate yarn twist and linear density, and wherein feedback control means are provided to regulate the diameter and linear density of the yarn from the drafting means and the twist imparted to the yarn by the twist insertion means so as to maintain the twist and linear density of the output yarn within predetermined limits.
Claim 18
Dependent Claim
96 words
A system as claimed in claim 13 comprising means for measuring the linear density of the travelling yarn relative to the linear density of the reference yarn comprising a capacitance head with one of each of its opposite poles positioned on opposite sides of the travelling yarn and a second capacitance head, with one of each its opposite poles positioned on opposite sides of the reference yarn such that a comparison of the outputs of each of said first and second heads provides a measure of the relative linear densities of the travelling and reference yarns.
Claim 19
Dependent Claim
33 words
A system as claimed in claim 13 wherein the yarn twist is calculated in accordance with the formula: T=(tan α)/(πd) where T=twist in turns per unit length; α=surface twist angle; and d=yarn diameter.
Claim 20
Dependent Claim
97 words
A system as claimed in claim 16 comprising means for measuring the linear density of the travelling yarn relative to the linear density of the reference yarn comprising a capacitance head with one of each of its opposite poles positioned on opposite sides of the travelling yarn and a second capacitance head, with one of each of its opposite poles positioned on opposite sides of the reference yarn such that a comparison of the outputs of each of said first and second heads provides a measure of the relative linear densities of the travelling and reference yarns.
Claim 21
Dependent Claim
95 words
A system as claimed in claim 17 in combination with yarn drafting means and twist insertion means wherein yarn formed by the drafting and twist insertion means passes through said system for measuring surface twist angle and diameter to calculate yarn twist and linear density, and wherein feedback control means are provided to regulate the twist imparted to the yarn by the twist insertion means and the diameter and linear density of the yarn from the drafting means, respectively, so as to maintain the twist and linear density of the output yarn within predetermined limits.
Claim 22
Dependent Claim
108 words
Apparatus for measuring the diameter of a travelling yarn relative to the diameter of a reference yarn comprising photoelectric means and a light source positioned on opposite sides of the travelling yarn such that the output of the photoelectric means varies in accordance with changes in diameter of the travelling yarn and, further photoelectric means with the reference yarn between said light source and said further photoelectric means such that the output of said further photoelectric means corresponds to the diameter of the reference yarn, and means for comparing the outputs of said photoelectric means as a measure of the relative diameters of said travelling and reference yarns.
Claim 23
Dependent Claim
108 words
Apparatus for measuring the diameter of a travelling yarn relative to the diameter of a reference yarn comprising photoelectric means and a light source positioned on opposite sides of the travelling yarn such that the output of the photoelectric means varies in accordance with changes in diameter of the travelling yarn and, further photoelectric means with the reference yarn between said light source and said further photoelectric means such that the output of said further photoelectric means corresponds to the diameter of the reference yarn, and means for comparing the outputs of said photoelectric means as a measure of the relative diameters of said travelling and reference yarns.
References Cited (Backward Citations)
US3945181A
Cited
US4045659A
Cited
US4000641A
Cited
US4168604A
Cited
US4148178A
Cited
US4430720A
Cited
US4506339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |