US4763699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System of detection of shed closed to shuttle passage in multi-step textile looms
Assignee: Nuovo Pignone Holding SpA
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Filing: 1987-07-24
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Granted: 1988-08-16
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Expires: 2007-07-24
Abstract
Abstract System of detection of a shed closed to passage of a shuttle in a multi-phase weaving textile loom. This invention is comprised of the following: sensitive control bars made elastically movable along the vertical direction, with a stroke at least equalling the vertical shift necessary for the shuttle roller to disengage from the corresponding thrust roller of the dragging chain of the same shuttle; two adjoining sensitive control blades, both are on the rotary-reed facing divergent side wall of each shuttle; the outward blade is fixed and rigid while the longer inward blade is rotatable around a vertical axis; and upon detection of a persistent entanglement by the control blades, a lever pin, kept in a retracted position by a retainer hook, is freed by movement of the retainer hook such that the lever pin springs outwards to protrude from the shuttle plane, pressing upon a sensitive control bar, generating a stop loom signal.
Inventors
- 👤 Luciano Corain
- 👤 Gianni Maitan
- 👤 Giulio Bortoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:13
CPC Classifications
D; D03; D03D; D03D47/00; D03D47/12; D03D47/26; D03D51/00; D03D51/18; D03D51/44; D03D51/46
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
202 words
A system for the detection of a shed closed by a persistent entanglement to passage of a shuttle in multiphase weaving type textile looms comprising: (a) a plurality of shuttles, each shuttle being provided in its bottom portion with a roller; (b) the roller of each shuttle cooperates with a corresponding thrust roller of a dragging chain; (c) a plurality of control bars that guide said shuttles on their upper portion, said control bars and shuttles being elastically moveable along a vertical direction; (d) two adjoining control blades, an inward rotatable blade and a shorter rigid and stationary outward blade, both located on a divergent side wall of each shuttle on a rotary reed-facing side thereof, wherein said inward control blade is maintained against the outward control blade by a spring; (e) a rotatable lever pin held in a retracted position within each shuttle such that movement of the inward control blade upon engagement of a persistent entanglement frees the rotation of said lever pin, whereupon the lever pin protrudes from the shuttle, thereby pushing a corresponding control bar upwards; and (f) means operatively connected to the loom for converting the upward movement of said control bars into a loom stop signal.
Claim 2
Independent Claim
202 words
A system for the detection of a shed closed by a persistent entanglement to passage of a shuttle in multiphase weaving type textile looms comprising: (a) a plurality of shuttles, each shuttle being provided in its bottom portion with a roller; (b) the roller of each shuttle cooperates with a corresponding thrust roller of a dragging chain; (c) a plurality of control bars that guide said shuttles on their upper portion, said control bars and shuttles being elastically moveable along a vertical direction; (d) two adjoining control blades, an inward rotatable blade and a shorter rigid and stationary outward blade, both located on a divergent side wall of each shuttle on a rotary reed-facing side thereof, wherein said inward control blade is maintained against the outward control blade by a spring; (e) a rotatable lever pin held in a retracted position within each shuttle such that movement of the inward control blade upon engagement of a persistent entanglement frees the rotation of said lever pin, whereupon the lever pin protrudes from the shuttle, thereby pushing a corresponding control bar upwards; and (f) means operatively connected to the loom for converting the upward movement of said control bars into a loom stop signal.
Claim 3
Dependent Claim
11 words
The system of claim 1 wherein each shuttle is triangularly shaped.
Claim 4
Dependent Claim
41 words
The system according to claim 1 wherein shifting means shifts said shuttle and corresponding control bar by at least a vertical stroke necessary for a roller of said shuttle to become disengaged from a corresponding thrust roller of a dragging chain.
Claim 5
Dependent Claim
29 words
The system of claim 1 wherein said means of converting the upward movement of said control bars into a loom stop signal comprises an excitation circuit of a transducer.
Claim 6
Dependent Claim
29 words
The system of claim 1 wherein said inward control blade has at one end a retainer hook as an appendage, the retainer hook controlling rotation of said lever pin.
Claim 7
Dependent Claim
27 words
The system of claim 1 wherein said outward rigid control blade engages and frees weak entanglements without causing loom stoppage by movement of said inward control blade.
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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |