Method of controlling tension in a yarn sheet during winding

摘要

Yarn sheet tension in a warp beaming operation is controlled by supplying a primary analog correcting signal to the drive of the warp beam based upon ultrasonic measurement of the progressively increasing effective beam diameter and by adding a supplementary proportional-plus-integral-plus-derivative (PID) correcting signal thereto based upon detected movements of a movable dancer roll biased into peripheral engagement with the yarn sheet as it is delivered to the warp beam.