Weft Accumulator and Measuring Systems
topic
Weft accumulators on air-jet looms unwind a defined length of weft yarn from the supply package and store it on a rotating drum before each pick insertion, releasing the pre-measured weft length at the start of insertion to eliminate the tension spike from direct package unwinding during air insertion, with accumulator drum diameter, winding speed, and yarn feeler arm position controlling the pre-measured length accuracy.
Role
Enables consistent weft insertion at high machine speed by pre-measuring each pick length with sufficient accuracy to prevent short pick faults from insufficient length or weft loops from excess length, with accumulator reliability and yarn feeler sensitivity being critical for maintaining the high weft insertion efficiency that defines air-jet loom productivity advantage.