Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1991-05-28
1992-09-08
Falik, Andrew M.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
1394352, 73862473, D03D 4730
Patent
active
051449889
ABSTRACT:
An instrument for measuring the tension of yarns--particularly weft yarns which wind or unwind forming a "balloon"--avoiding further deviations thereof, which makes use of a variable impedance, for example a differential capacitor or a variable inductor, comprising a movable component and at least one fixed component as parts of an electric measuring circuit. All the components of the instrument have a centered symmetry and a passage through their center for the yarn whose tension has to be measured, with a yarn guiding and deviating eyelet positioned in correspondence of the closing vertex of the "balloon" and fixed to the movable component of the variable impedance. The variable voltage detected on one of the components of the impedance, as a function of the tension of the yarn sliding through the eyelet, is measured by a measuring device connected to the movable component. A weft yarn feeder for looms, having at its outlet an instrument with centered symmetry as described hereabove, positioned on the main axis of the weft feeder so as to measure the tension of the unwinding yarn being fed to the loom is also disclosed.
REFERENCES:
patent: 4932442 (1990-06-01), Ishido et al.
patent: 5050648 (1991-09-01), Pezzoli
Falik Andrew M.
Roj Electrotex S.p.A.
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