Yarn feeder with rotary storage drum and yarn-unwinding sensor
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United States of America Patent
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Aug 22, 2017
Issued Date -
N/A
app pub date -
Sep 8, 2015
filing date -
Sep 5, 2014
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A motorized rotary drum supported on a motor housing bears a plurality of yarn loops wound thereon, such loops being adapted to be unwound upon request from a downstream machine. A yarn-unwinding sensor comprises light-emitting elements and light-receiving elements both of which are integral with the motor housing. Light-guiding elements which are integral with the drum guide the light from the light-emitting elements to a window which is defined on the rotary drum in a position such that it is repeatedly engaged by the yarn during its rotary unwinding motion, and vice versa. A reflecting surface reflects the light coming out of the window back towards the window. Light-deviating elements which are integral with the motor housing deviate the light coming back from the window towards the light-receiving elements. The unwinding of a yarn loop from the drum is determined on the basis of the variation of light resulting from the yarn transiting on the window.
First Claim
Family
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Cited Art Landscape
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