Patent US4184769A successfully refreshed from Google Patents.
US4184769A
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Determination of yarn defects
Assignee: Zellweger Uster AG
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Filing: 1976-09-03
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Granted: 1980-01-22
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Expires: 1996-09-03
Abstract
Abstract In a method and apparatus for the detection of yarn defects, which may be effected in combination with a standard yarn clearer or independently thereof, the cross section of the yarn is continuously scanned and an electrical signal is generated representing not only the cross section and length of yarn defects, but also their frequency or periodicity, and these features are used as the criterion for generating a defect signal as an indication of detection of regular or irregular sequences of thick places in the yarn.
Inventors
- 👤 Kurt Aeppli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:53
CPC Classifications
B; B65; B65H; B65H63/00; B65H63/06; B65H63/062; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
128 words
A method for the detection of yarn defects after the spinning thereof, comprising the steps of continuously running the yarn through a conventional yarn clearer system to remove thick places greater than a particular cross section in the yarn, continuously scanning the yarn as it passes a detection point, producing an electrical signal representing the cross section of the yarn passing said detection point, analyzing said electrical signal to determine the length and periodicity of defects in the yarn, and indicating detection of a defective yarn on the basis of occurrence of only predetermined sequences of thick places that approximate periodic defects that would be caused by the yarn spinning process itself in the yarn as determined from analysis of said electrical signal over a period of time.
Claim 2
Independent Claim
128 words
A method for the detection of yarn defects after the spinning thereof, comprising the steps of continuously running the yarn through a conventional yarn clearer system to remove thick places greater than a particular cross section in the yarn, continuously scanning the yarn as it passes a detection point, producing an electrical signal representing the cross section of the yarn passing said detection point, analyzing said electrical signal to determine the length and periodicity of defects in the yarn, and indicating detection of a defective yarn on the basis of occurrence of only predetermined sequences of thick places that approximate periodic defects that would be caused by the yarn spinning process itself in the yarn as determined from analysis of said electrical signal over a period of time.
Claim 3
Dependent Claim
39 words
A method for the detection of yarn defects, as defined in claim 1, wherein said step of indicating detection of a defective yarn includes activation of a display producing a visual indication of the detection of the defective yarn.
Claim 4
Dependent Claim
46 words
A method for the detection of yarn defects, as defined in claim 1, wherein the step of analyzing includes the step of detection of regular sequences of thick places having at least a predetermined length and occurring at least at a predetermined frequency in the yarn.
Claim 5
Dependent Claim
46 words
A method for the detection of yarn defects, as defined in claim 1, wherein said step of analyzing includes the step of detection of irregular sequences of thick places having at least a predetermined length and occurring at least at a predetermined frequency in the yarn.
Claim 6
Independent Claim
123 words
A method for the detection of yarn defects to be performed in combination with and as an addition to the functioning of a standard yarn clearer, comprising the steps of producing an electrical signal representing the cross section of the yarn as it passes through said yarn clearer, analyzing said electrical signal to determine the length and periodicity of defects in the yarn, detecting the occurrence of only predetermined sequences of thick places having at least a predetermined length and occurring at least at a predetermined frequency in the yarn which would approximate the periodic defects that would be caused by the yarn spinning process itself, and indicating presence of a defective yarn as determined from said analysis and detection of the yarn.
Claim 7
Independent Claim
123 words
A method for the detection of yarn defects to be performed in combination with and as an addition to the functioning of a standard yarn clearer, comprising the steps of producing an electrical signal representing the cross section of the yarn as it passes through said yarn clearer, analyzing said electrical signal to determine the length and periodicity of defects in the yarn, detecting the occurrence of only predetermined sequences of thick places having at least a predetermined length and occurring at least at a predetermined frequency in the yarn which would approximate the periodic defects that would be caused by the yarn spinning process itself, and indicating presence of a defective yarn as determined from said analysis and detection of the yarn.
Claim 8
Dependent Claim
39 words
A method for the detection of yarn defects as defined in claim 5 wherein said step of indicating detection of a defective yarn includes activation of a display producing a visual indication of the detection of the defective yarn.
Claim 9
Dependent Claim
164 words
A yarn processing apparatus comprising: conventional means for removing defects having a predetermined cross section in the yarn, detection means connected to said conventional defect removing means for detecting defects in yarn moving past a detection point in said detection means and producing an electrical signal representing the cross section of the yarn, filter means responsive to the output of said detection means for passing only signal components in a selectively adjustable frequency range representing defects of only predetermined length and occurring at least at a predetermined frequency in the yarn which would be caused by the yarn spinning process itself, first comparator means for producing an output only when the signal components passed by said filter means exceed a predetermined amplitude, monostable multivibrator means connected to the output of said first comparator means, integrator means connected to the output of said multivibrator means, and second comparator means for producing a defect signal when the output of said integrator means exceeds a predetermined level.
Claim 10
Dependent Claim
164 words
A yarn processing apparatus comprising: conventional means for removing defects having a predetermined cross section in the yarn, detection means connected to said conventional defect removing means for detecting defects in yarn moving past a detection point in said detection means and producing an electrical signal representing the cross section of the yarn, filter means responsive to the output of said detection means for passing only signal components in a selectively adjustable frequency range representing defects of only predetermined length and occurring at least at a predetermined frequency in the yarn which would be caused by the yarn spinning process itself, first comparator means for producing an output only when the signal components passed by said filter means exceed a predetermined amplitude, monostable multivibrator means connected to the output of said first comparator means, integrator means connected to the output of said multivibrator means, and second comparator means for producing a defect signal when the output of said integrator means exceeds a predetermined level.
Claim 11
Dependent Claim
17 words
An apparatus as defined in claim 7, wherein said filter means is a variable low pass filter.
Claim 12
Dependent Claim
17 words
An apparatus as defined in claim 7, wherein said filter means is a variable band pass filter.
Claim 13
Dependent Claim
30 words
An apparatus as defined in claim 7, further including display means responsive to said defect signal for providing a visual indication of detection of a defective condition of said yarn.
Claim 14
Dependent Claim
119 words
In combination with a yarn clearer, an apparatus for the detection of both regularly and irregularly occurring sequences of thick places in a yarn comprising: means for generating an electrical signal representing the cross section of the yarn, means for analyzing said electrical signal to determine the length and periodicity of defects in the yarn including detection means for detecting the occurrence of only predetermined sequences of thick places having at least a predetermined length and occurring at least at a predetermined frequency in the yarn that would approximate periodic defects that would be caused by the yarn spinning process itself, and indicating means responsive to said detection means for indicating detection of a defective condition of said yarn.
Claim 15
Dependent Claim
119 words
In combination with a yarn clearer, an apparatus for the detection of both regularly and irregularly occurring sequences of thick places in a yarn comprising: means for generating an electrical signal representing the cross section of the yarn, means for analyzing said electrical signal to determine the length and periodicity of defects in the yarn including detection means for detecting the occurrence of only predetermined sequences of thick places having at least a predetermined length and occurring at least at a predetermined frequency in the yarn that would approximate periodic defects that would be caused by the yarn spinning process itself, and indicating means responsive to said detection means for indicating detection of a defective condition of said yarn.
Claim 16
Dependent Claim
26 words
An apparatus as defined in claim 11 wherein said indicating means includes a combination of indicating elements of different type operable independently of said yarn clearer.
Claim 17
Dependent Claim
35 words
An apparatus as defined in claim 11 wherein said detection means comprises frequency-dependent means for passing only components of said electrical signal which fall within a selectively adjustable frequency range representing defects of predetermined length.
Claim 18
Dependent Claim
49 words
An apparatus as defined in claim 13 wherein said detection means further comprises first comparator means for producing an output signal upon receipt of a signal component exceeding a predetermined amplitude from said frequency dependent means, and a monostable multivibrator connected to the output of said first comparator means.
Claim 19
Dependent Claim
42 words
An apparatus as defined in claim 14 wherein said detection means further comprises an integrator connected to the output of said monostable multivibrator, and second comparator means for producing a defect signal when the output of said integrator exceeds a predetermined level.
Claim 20
Dependent Claim
18 words
An apparatus as defined in claim 13 wherein said frequency dependent means comprises a variable low pass filter.
Claim 21
Dependent Claim
18 words
An apparatus as defined in claim 13 wherein said frequency dependent means comprises a variable band pass filter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |