Yarn feeder provided with a stationary drum and with a controlled, weft-braking device
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United States of America Patent
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May 31, 2016
Grant Date -
Jul 4, 2013
app pub date -
Dec 21, 2012
filing date -
Dec 28, 2011
priority date (Note) -
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Abstract
A drum has a plurality of yarn loops wound thereon which are to be unwound upon request from a downstream machine. A weft-braking device provided with a braking member having a circular profile is biased against a delivery edge of the drum by driving elements. The yarn is adapted to run between the delivery edge and the braking member to receive a braking action by friction from them. The driving elements comprise at least one piezoelectric actuator which is deformable in response to a voltage applied thereto and has a movable operative end which is operatively connected to the braking member and a stationary operative end which is anchored to a stationary support.
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