US3731069A
Expired / Lapsed
US
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Apparatus for detecting yarn quality information
Assignee: Asahi Kasei Corp
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Filing: 1971-08-27
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Granted: 1973-05-01
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Expires: 1991-08-27
Abstract
Abstract Yarn evenness or nonuniformity in thickness or mass of filamentary or film-shaped yarns formed of synthetic polymers, natural or regenerated celluloses or the like is detected in the form of electrical deviation signals, which are applied first to an areal average detector circuit to provide an areal average, lengthwise of the yarn, of irregularities, secondly to a peak value detector circuit to provide an average of crest values lengthwise of the yarn of the irregularities, and thirdly to an abnormality detector circuit to detect abnormally thick yarn portions such as fluff or slub which occur isolatedly or to detect filament abnormalities in a multi-filament yarn which also occur isolatedly. These detected outputs are derived from a running yarn or yarns travelling through a yarn production, finishing or false twist process and are adapted to be utilized in an electronic computer for overall evaluation to determine the yarn quality.
Inventors
- 👤 T Goto
- 👤 T Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:37
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/36; G01N33/365
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
121 words
Apparatus for detecting yarn quality information comprising a device for producing a deviation signal which varies in accordance with the irregularities in thickness or mass of a length of yarn being monitored, an areal average detector circuit responsive to an areal average of the deviation signal to produce an areal average signal representative of the average value of the irregularities occurring along the length of yarn, and a peak value average detector circuit responsive to an average of peak values of the deviation signal to produce a peak average signal representative of the average of peak values of the irregularities occurring along the length of yarn, said areal average and peak average signals being indicative of the quality of the yarn.
Claim 2
Dependent Claim
121 words
Apparatus for detecting yarn quality information comprising a device for producing a deviation signal which varies in accordance with the irregularities in thickness or mass of a length of yarn being monitored, an areal average detector circuit responsive to an areal average of the deviation signal to produce an areal average signal representative of the average value of the irregularities occurring along the length of yarn, and a peak value average detector circuit responsive to an average of peak values of the deviation signal to produce a peak average signal representative of the average of peak values of the irregularities occurring along the length of yarn, said areal average and peak average signals being indicative of the quality of the yarn.
Claim 3
Dependent Claim
32 words
Apparatus according to claim 1, further including a circuit for rectifying the deviation signal, and a yarn cut detector circuit for detecting the reduction of the rectified output below a given level.
Claim 4
Dependent Claim
98 words
Apparatus according to claim 1, in which the areal average detector circuit comprises a circuit for detecting one polarity of the deviation signal, a time constant circuit constituted by a capacitor and a resistor to which said detected signal of said one polarity is supplied, the time constant circuit having a charging time constant which is greater than pulse widths of the deviation signal and having a discharge time cOnstant which is chosen less than time intervals between adjacent occurring pulses, and a circuit for averaging out the signal developed across said resistor of the time constant circuit.
Claim 5
Dependent Claim
62 words
Apparatus according to claim 1, in which the areal average detector circuit comprises a first detector circuit for detecting one polarity of the deviation signal, a second detector circuit for detecting the other polarity of the deviation signal, and a circuit for adding the outputs from the first and second detector circuits together with a same polarity and averaging out the result.
Claim 6
Dependent Claim
27 words
Apparatus according to claim 1, in which the peak average detector circuit comprises a voltage doubler rectifier of the type in which a peak value is detected.
Claim 7
Dependent Claim
102 words
Apparatus according to claim 1, in which the deviation signal producing device comprises transducer means for varying the voltage of a high frequency electrical signal in a capacitive transducing fashion in accordance with irregularities in thickness or mass of the yarn, a rectifier circuit for rectifying the converted high frequency electrical signal, said rectifier circuit having a noise response which is reduced at relatively low frequencies, and an amplifier with negative feedback to which the rectified output is supplied and having a frequency response to block frequencies less than that corresponding to the length of the longest extending irregularity to be monitored.
Claim 8
Dependent Claim
112 words
Apparatus for detecting yarn quality information comprising means provided separately for a plurality of running yarns to be measured for producing a deviation signal which varies in accordance with irregularities in thickness or mass of each yarn being measured, scan means for deriving the deviation signals successively, an areal average detector circuit which is supplied with the output of the scan means, a peak value average circuit for producing an average of peak values of yarn evenness, and means for collectively evaluating the outputs of the areal average detector circuit and the peak value average circuit for each yarn to derive information concerning the quality and grade of each yarn being measured.
Claim 9
Dependent Claim
112 words
Apparatus for detecting yarn quality information comprising means provided separately for a plurality of running yarns to be measured for producing a deviation signal which varies in accordance with irregularities in thickness or mass of each yarn being measured, scan means for deriving the deviation signals successively, an areal average detector circuit which is supplied with the output of the scan means, a peak value average circuit for producing an average of peak values of yarn evenness, and means for collectively evaluating the outputs of the areal average detector circuit and the peak value average circuit for each yarn to derive information concerning the quality and grade of each yarn being measured.
Claim 10
Dependent Claim
41 words
Apparatus according to claim 7, further comprising a circuit supplied with the output of the scan means for detecting isolatedly occurring abnormal levels of the deviation signal, the output from the last mentioned circuit being also fed to the evaluating means.
Claim 11
Dependent Claim
56 words
Apparatus according to claim 7, further comprising a filter circuit supplied with the output of the scan means for detecting low frequency components thereof, and an abnormally low level detector circuit for detecting the low frequency components below a given level, the output of the last mentioned detector circuit being also fed to the evaluating means.
Claim 12
Dependent Claim
73 words
Apparatus according to claim 7, further comprising means for issuing a yarn cutting instruction for a yarn being measured which is determined to be of defective quality by the evaluating means, a circuit for producing a yarn cutting signal in response to the yarn cutting instruction, and means associated with each of the yarns being measured to cut a running yarn at a given location thereof in response to the yarn cutting signal.
Claim 13
Dependent Claim
60 words
Apparatus according to claim 10, in which the yarn cutting means is interposed between the deviation signal detecting means and the scan means, the arrangement being such that a signal of high level is produced upon disappearance of the deviation signal from the deviation signal detecting means, said signal of high level being effective to operate the yarn cutting means.
Claim 14
Dependent Claim
50 words
Apparatus according to claim 7, further comprising means for deriving from the output of the areal average detector circuit information concerning shading formed upon dyeing a cloth woven from the yarn being measured and for deriving from the output of the peak value average detector circuit information concerning dye streaking.
Claim 15
Dependent Claim
51 words
Apparatus according to claim 7, in which the evaluating means stores the outputs of the areal average detector circuit and the peak value average detector circuit separately for each of the yarns being measured and determines the quality grade of the yarns being measured on the basis of the stored outputs.
Claim 16
Dependent Claim
48 words
Apparatus according to claim 13, further comprising means for according to the outputs from the detector circuits differential weights according to the variety of the detector circuit before being added together, the sum being made the basis to determine the quality grade of a corresponding yarn being measured.
Claim 17
Independent Claim
110 words
A method of measuring the quality of yarn comprising the steps of: producing a deviation signal which varies in accordance with the irregularities in thickness or mass which occur along a length of the yarn; averaging said deviation signal to produce an areal average signal representative of the average value of irregularities occurring along the length of yarn; averaging the peak values of said deviation signal to produce a peak average signal representative of the average of the peak values of irregularities occurring along the length of yarn; and using said areal average signal and said peak average signal as a measure of the quality of the length of yarn.
Claim 18
Independent Claim
110 words
A method of measuring the quality of yarn comprising the steps of: producing a deviation signal which varies in accordance with the irregularities in thickness or mass which occur along a length of the yarn; averaging said deviation signal to produce an areal average signal representative of the average value of irregularities occurring along the length of yarn; averaging the peak values of said deviation signal to produce a peak average signal representative of the average of the peak values of irregularities occurring along the length of yarn; and using said areal average signal and said peak average signal as a measure of the quality of the length of yarn.
Claim 19
Dependent Claim
28 words
A method according to claim 15 further comprising the step of determining from said areal average and peak average signals the dyeing grade of the length of yarn.
Claim 20
Dependent Claim
36 words
A method according to claim 16 further comprising the step of determining from said areal average signal information concerning dye shading which would occur in the yarn when it is subsequently formed into cloth and dyed.
Claim 21
Dependent Claim
32 words
A method according to claim 17 further comprising the step of determining from said peak average signal information concerning dye streaking which would occur in the yarn when it is subsequently dyed.
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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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |