The filling yarn threaded into nozzle tubes 1 is accelerated by the concentrated air-jet and inserted into the shed. The amount of air needed depends on the yarn structure and the yarn count. It is controlled by means of pressure control valve 3. To keep the motionless pick tensioned, a weak air stream is blown onto the yarn lying in the main nozzle. The air volume needed for this purpose can be individually controlled.To reduce the weft insertion time, a tandem nozzle 4 is used, which is the equivalent of two main nozzles positioned one behind the other. The tandem nozzle has the job of unwinding the weft yarn from the drum feeder. The winding resistance is thus compensated for by the tandem nozzle. The pressure can be reduced at the main nozzle, assuring very gentle yarn insertion.
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