US3986037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yarn detector with a self-calibrating circuit
Assignee: EIDP Inc
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Filing: 1975-10-03
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Granted: 1976-10-12
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Expires: 1995-10-03
Abstract
Abstract In a yarn inspection system for detecting variations in yarn diameter wherein a plurality of yarns move past a plurality of transducers for generating electrical signal outputs corresponding to yarn diameter and including discriminator circuitry sequentially connected to each of the transducers for processing the signal outputs, a self calibrating circuit arrangement has been devised to compensate for normal variations in the output of individual transducers due to different characteristics among the separate transducers.
Inventors
- 👤 Mark Edwin Faulhaber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:10
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/08; G01B11/10; G01B11/105; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8914; G01N21/8915
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
156 words
In a yarn inspection system for detecting variations in yarn diameter wherein a yarn moves past a transducer for generating electrical signal outputs corresponding to yarn diameter and including electronic discriminator means connected to said transducer for processing said electrical signal outputs to indicate variations above a predetermined level, the improvement comprising: a variable gain amplifier circuit responsive to said electrical signal outputs for supplying a voltage output; a means summing the voltage output from the variable gain amplifier with a reference voltage of opposite polarity for supplying a resultant signal to said electronic discriminator means; means for automatically adjusting the gain of the amplifier to maintain the output of said amplifier at a constant level when yarn of substantially constant diameter is passing through the transducers; and means actuated by said discriminator means for maintaining the gain of said amplifier at a constant level when instantaneous variations in yarn diameter occur above a predetermined level.
Claim 2
Dependent Claim
156 words
In a yarn inspection system for detecting variations in yarn diameter wherein a yarn moves past a transducer for generating electrical signal outputs corresponding to yarn diameter and including electronic discriminator means connected to said transducer for processing said electrical signal outputs to indicate variations above a predetermined level, the improvement comprising: a variable gain amplifier circuit responsive to said electrical signal outputs for supplying a voltage output; a means summing the voltage output from the variable gain amplifier with a reference voltage of opposite polarity for supplying a resultant signal to said electronic discriminator means; means for automatically adjusting the gain of the amplifier to maintain the output of said amplifier at a constant level when yarn of substantially constant diameter is passing through the transducers; and means actuated by said discriminator means for maintaining the gain of said amplifier at a constant level when instantaneous variations in yarn diameter occur above a predetermined level.
Claim 3
Dependent Claim
39 words
The system as defined in claim 1, there being a plurality of yarns moving past a plurality of transducers, each of said transducers being sequentially connected to said electronic discriminator means for processing electrical signal outputs from each transducer.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |