Patent US3272541A successfully refreshed from Google Patents.
US3802467A
Expired / Lapsed
US
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Warp unwinder for weaving looms
Assignee: Picanol NV
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Filing: 1972-02-22
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Granted: 1974-04-09
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Expires: 1992-02-22
Abstract
Abstract The invention pertains a process for warp let off from a thread shaft in a weaving loom with take-up device and in which the thread shaft is driven by an electric motor, comprising the steps of transforming the motion of a movable part of the take-up device into an electric magnitude inversely proportional to the pick density; transforming continuously the thread shaft diameter into an electric magnitude inversely proportional to such diameter; detecting and transforming at least the tension variations of the warp into an electric amplitude proportional thereto; conducting the rotary speed of said electric motor with these three electric magnitudes in such a manner that this speed remains constantly inversely proportional to the pick density and to the diameter of the thread shaft and that this speed changes in the same direction as the said tension variations of the warp, during normal operation of the loom.
Inventors
- 👤 B Steverlynck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:39
CPC Classifications
D; D03; D03D; D03D49/00; D03D49/04; D03D49/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
Process for warp let off from a warp beam in a weaving loom with take up device and in which the warp beam is driven by an electric motor, comprising the steps of transforming the motion of a movable part of the take up device into an electric magnitude inversely proportional to the pick density; transforming continuously the warp beam diameter into an electric magnitude inversely proportional to such diameter; detecting and transforming at least the tension variations of the warp into an electric amplitude proportional thereto; conducting the rotary speed of said electric motor with these three electric magnitudes in such a manner that this speed remains constantly inversely proportional to the pick density and to the diameter of the warp beaM and that this speed changes in the same direction as the said tension variations of the warp, during normal operation of the loom.
Claim 2
Dependent Claim
146 words
Process for warp let off from a warp beam in a weaving loom with take up device and in which the warp beam is driven by an electric motor, comprising the steps of transforming the motion of a movable part of the take up device into an electric magnitude inversely proportional to the pick density; transforming continuously the warp beam diameter into an electric magnitude inversely proportional to such diameter; detecting and transforming at least the tension variations of the warp into an electric amplitude proportional thereto; conducting the rotary speed of said electric motor with these three electric magnitudes in such a manner that this speed remains constantly inversely proportional to the pick density and to the diameter of the warp beaM and that this speed changes in the same direction as the said tension variations of the warp, during normal operation of the loom.
Claim 3
Dependent Claim
26 words
Process according to claim 1, wherein the electric magnitude into which the warp tension variations are transformed is also maintained proportional to the momentary motor speed.
Claim 4
Dependent Claim
156 words
Device for warp let off from the warp beam in a weaving loom with take up device and in which the warp beam is driven by an electric motor, comprising the combination of means aimed at transforming the motion of a movable part of the take up device into an electric magnitude inversely proportional to the pick density; means for continually transforming the warp beam diameter into an electric magnitude inversely proportional to such diameter, means for detecting and transforming at least the warp beam variations into an electric magnitude proportional to it and means for conducting the rotary speed of said electric motor on the basis of the three said electric magnitudes in such a manner that such speed remains constantly inversely proportional to the pick density and to the warp beam diameter and that such speed further changes in the same direction as the said warp tension variations, during normal operation of the loom.
Claim 5
Dependent Claim
156 words
Device for warp let off from the warp beam in a weaving loom with take up device and in which the warp beam is driven by an electric motor, comprising the combination of means aimed at transforming the motion of a movable part of the take up device into an electric magnitude inversely proportional to the pick density; means for continually transforming the warp beam diameter into an electric magnitude inversely proportional to such diameter, means for detecting and transforming at least the warp beam variations into an electric magnitude proportional to it and means for conducting the rotary speed of said electric motor on the basis of the three said electric magnitudes in such a manner that such speed remains constantly inversely proportional to the pick density and to the warp beam diameter and that such speed further changes in the same direction as the said warp tension variations, during normal operation of the loom.
Claim 6
Dependent Claim
27 words
Device according to claim 3, including means for also maintaining the electric magnitude into whiclh the warp tension variations are transformed proportional to the momentary motor speed.
Claim 7
Dependent Claim
67 words
Warp unwinder according to claim 3, for a weaving loom in which the warp beam spindle is driven by an electric motor with variable speed, said unwinder being equipped with three separate recorders, respectively influence by the pick density, the warp beam diameter and the tension and/or tension fluctuations of the warp, while the outlet signals of such recorders determine simultaneously the rotary speed of the motor.
Claim 8
Dependent Claim
49 words
Warp unwinder according to claim 5, wherein said recorder which is influenced by the pick density consists of a magnetic recorder, placed near the cogging of a cog-wheel provided for such purpose and which is secured on the spindle of one of the usual shot wheels of the loom.
Claim 9
Dependent Claim
29 words
Warp unwinder according to claim 4, wherein said recorder which is influenced by the warp shaft diameter, consists of a potentiometer controlled by the motion of a shaft scanner.
Claim 10
Dependent Claim
43 words
Warp unwinder according to claim 4, wherein said recorder which is influenced by the tension and/or tension fluctuations of the warp, consists of a pressure recorder, placed under a fixing pedestal of the bearings of a conducting roller on which the warp runs.
Claim 11
Dependent Claim
17 words
Warp unwinder according to claim 3, wherein said motor is a direct current motor with constant field.
References Cited (Backward Citations)
US3125127A
Cited
FR928471A
Cited
US2674109A
Cited
US2627592A
Cited
US2871685A
Cited
US3072154A
Cited
US3308854A
Cited
US3489967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |