Weft Feeder Monitoring and Coil Count Control
topic
Electronic weft feeder coil count monitoring uses optical sensors detecting yarn presence on the storage drum to maintain the programmed coil count by adjusting winding motor speed in real time, with coil count too low causing insertion tension spikes from insufficient stored yarn buffer and coil count too high causing yarn accumulation on the drum that increases unwinding tension, with closed-loop coil count control maintaining the optimal storage level that provides consistent zero-tension weft delivery throughout each pick cycle.
Role
Maintains the consistent weft delivery tension that is the feeder's primary quality function by controlling the yarn storage level that determines whether the pick draws from a full or nearly empty buffer, with coil count control being the active closed-loop function that compensates for the variation in winding and unwinding rates caused by speed changes, pick length variation, and supply package tension differences that would otherwise cause coil count drift and insertion tension variation.