Back rest arrangement for controlling warp thread tension
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United States of America Patent
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Aug 27, 1996
Grant Date -
N/A
app pub date -
Dec 5, 1994
filing date -
Jun 10, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device controls warp thread tension in a weaving machine, which the warp thread tension being dependent upon rotation of a plurality of beams forming part of the weaving machine and included in a back rest system for the warp threads, wherein the plurality of beams are pressed against each other and the warp threads run between the beams. At least one beam of the plurality of beams is suspended in a positionally mobile manner and at least one force detection mechanism is provided for detecting at least one force resulting from the wrap thread tension exerted on the beam and for generating at least one control signal. The at least one control signal controls an activation system for providing the thread tension control by affecting the rotations of the beams in both their rotational directions adjusting the feed of the warp threads continuously or by close-intervalled step-by-step changes in forward and backwards directions.
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