US4158284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yarn quality monitoring apparatus
Assignee: Rockwell Collins Deutschland GmbH
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Filing: 1977-12-22
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Granted: 1979-06-19
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Expires: 1997-12-22
Abstract
Abstract In order to monitor irregularities and changes in structure of yarn being produced in an open-end spinning turbine provided with its own individual drive motor, there is provided a circuit which senses and evaluates changes in the current consumption by the motor.
Inventors
- 👤 Heinz Wehde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:19
CPC Classifications
D; D01; D01H; D01H13/00; D01H13/14; D01H13/22; D01H4/00; D01H4/04; D01H4/08; D01H4/12; D01H4/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
In apparatus for monitoring yarn being produced in an open-end spinning turbine provided with its own electric drive motor, which apparatus includes means for detecting spinning condition variations which cause irregularities and/or changes in structure in the yarn and an evaluation circuit providing an indication upon the occurrence of such irregularity, the improvement wherein said detecting means comprises a sensor connected for sensing changes in the current consumption of the drive motor indicative of the occurrence of such spinning condition variations.
Claim 2
Dependent Claim
81 words
In apparatus for monitoring yarn being produced in an open-end spinning turbine provided with its own electric drive motor, which apparatus includes means for detecting spinning condition variations which cause irregularities and/or changes in structure in the yarn and an evaluation circuit providing an indication upon the occurrence of such irregularity, the improvement wherein said detecting means comprises a sensor connected for sensing changes in the current consumption of the drive motor indicative of the occurrence of such spinning condition variations.
Claim 3
Dependent Claim
15 words
An arrangement as defined in claim 1 wherein said motor is a brushless d.c. motor.
Claim 4
Dependent Claim
28 words
An arrangement as defined in claim 1 wherein said evaluation circuit is arranged to respond to a single such change of a given magnitude in the current consumption.
Claim 5
Dependent Claim
19 words
An arrangement as defined in claim 3 wherein said circuit responds to such changes having a predetermined minimum duration.
Claim 6
Dependent Claim
37 words
An arrangement as defined in claim 1 wherein said evaluation circuit responds to short-duration changes in motor current consumption and provides an indication when a given number of such changes occur during a given period of time.
Claim 7
Dependent Claim
68 words
An arrangement as defined in claim 1 wherein the turbine includes a rotor and an elastically mounted bearing bush supporting the rotor, and further comprising a second sensor disposed for sensing radial deflections experienced by the bush during rotation of the rotor due to imbalances, and a second evaluation circuit connected to said second sensor and operative to produce an indication upon the occurrence of such radial deflections.
Claim 8
Dependent Claim
32 words
An arrangement as defined in claim 6 wherein the evaluation circuit is operative to produce the indication upon the occurrence of a given number of radial deflections during a given time period.
References Cited (Backward Citations)
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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) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |