US3593756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broken weft thread detector
Assignee: ROJ CONTROLLI AUTOMATIC PAR L
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Filing: 1968-01-22
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Granted: 1971-07-20
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Expires: 1988-01-22
Abstract
Abstract A detector device for detecting breakage of a weft thread in a loom utilizes induction between a coil carried by the shuttle and a fixed coil on the thrashboard to provide a signal-indicating thread failure. The coil on the shuttle is effective to induce a signal in the fixed coil only when a circuit is completed through the shuttle coil by contacts which are acted upon by the thread in the shuttle and which close when the tension in the thread relaxes.
Inventors
- 👤 Sergio Vella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:47
CPC Classifications
D; D03; D03D; D03D51/00; D03D51/18; D03D51/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
197 words
A detector device for detecting broken weft thread in a weaving loom, comprising: a shuttle having means for mounting a spool of thread therein to supply a weft thread to the loom, a first c4il assembly carried in said shuttle with means responsive to the presence of a weft thread under tension to disable the coil and responsive to a broken weft to activate the coil, a thrashboard on the loom to define the path of the shuttle, a second coil assembly mounted in the thrashboard in the path of the shuttle, a source of magnetic flux mounted in the path of the shuttle, in spaced relation to said second coil, whereby when the shuttle passes the flux source and the weft is broken the means responsive activates the first coil assembly so that said flux will induce a current pulse therein which will in turn induce a signal voltage in the second coil assembly to stop the loom and when the weft is iNtact and under tension the means responsive will disable the first coil assembly so that there is no current flow therethrough and the second coil assembly will have no signal voltage induced therein.
Claim 2
Dependent Claim
197 words
A detector device for detecting broken weft thread in a weaving loom, comprising: a shuttle having means for mounting a spool of thread therein to supply a weft thread to the loom, a first c4il assembly carried in said shuttle with means responsive to the presence of a weft thread under tension to disable the coil and responsive to a broken weft to activate the coil, a thrashboard on the loom to define the path of the shuttle, a second coil assembly mounted in the thrashboard in the path of the shuttle, a source of magnetic flux mounted in the path of the shuttle, in spaced relation to said second coil, whereby when the shuttle passes the flux source and the weft is broken the means responsive activates the first coil assembly so that said flux will induce a current pulse therein which will in turn induce a signal voltage in the second coil assembly to stop the loom and when the weft is iNtact and under tension the means responsive will disable the first coil assembly so that there is no current flow therethrough and the second coil assembly will have no signal voltage induced therein.
Claim 3
Dependent Claim
77 words
A device as claimed in claim 1 wherein said second coil assembly includes two coils mounted adjacent opposite ends of the path of movement of the shuttle and two respective sources of magnetic flux mounted inwardly thereof beside the respective coils of the second assembly, whereby an electrical signal is induced in a coil of the second assembly only by movement of the shuttle towards the end of the said path adjacent which said coil is situated.
Claim 4
Dependent Claim
21 words
A device as claimed in claim 2 wherein the source of magnetic flux is a permanent magnet imbedded in the lay.
Claim 5
Dependent Claim
84 words
A device as claimed in claim 1 wherein the first coil assembly comprises a pair of coils spaced-apart longitudinally on the shuttle and the means responsive includes normally closed contacts which connect the two coils in series and which are adapted to be held open by tension in the weft thread, the source of magnetic flux being spaced inwardly from the respective coil of the second coil assembly by a distance which exceeds the distance between the two coils of the first coil assembly.
Claim 6
Dependent Claim
42 words
A device as claimed in claim 4 wherein the difference between the distance separating the second coil assembly and the magnetic flux source and the distance separating the coils of the first coil assembly lies in the range 10 to 15 mm.
Claim 7
Dependent Claim
54 words
A device as claimed in claim 4 wherein said second coil assembly includes two coils mounted adjacent opposite ends of the lay and two magnetic flux sources mounted on the lay and spaced inwardly from the respective coils by equal distances which exceed the distance between the two coils of the first coil assembly.
References Cited (Backward Citations)
US2535369A
Cited
DE861829C
Cited
US3298401A
Cited
DE1253647B
Cited
US3373773A
Cited
US3326246A
Cited
FR1473899A
Cited
US3322162A
Cited
US3467149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |