Stock-controlling method for a storage yarn feeder with rotary drum
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United States of America Patent
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Mar 28, 2017
Grant Date -
Aug 13, 2015
app pub date -
Feb 12, 2015
filing date -
Feb 13, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A yarn feeder is provided with a drum which is driven to rotate by a motor controlled by a control unit for drawing yarn from a reel and winding it upon itself in the shape of loops forming a stock. The control unit estimates the stock on the drum on the basis of an information indicative of the amount of yarn which is unwound from the drum upon request from a downstream machine, and of an information indicative of the amount of yarn which is wound on the drum, and retroactively controls the motor to substantially stabilize the stock on a reference value. The control unit also performs a parallel correction routine in which compares the stock with the reference value to estimate a stock status RES
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