Cyclical Position
Rotational measurement of the loom’s main shaft at the moment the weft yarn reaches the receiving side defines the window for a successful insertion. Adjusting the pick arrival angle ensures that the weft yarn reaches the opposite side of the loom at the correct point in the machine cycle. Technicians monitor this angle on the loom’s digital display to verify the timing of the air jet system.
A shift outside the boundaries triggers an automatic stop to prevent weaving errors.
Mechanical Coordination
Adjustments to the pick arrival angle involve fine-tuning the pressure at the relay nozzles and the timing of the solenoid valves. Flax yarn requires a specific acceleration curve because its weight and stiffness differ from other natural fibers. Increasing the pressure usually results in an earlier arrival angle.
Consistent timing prevents the formation of frayed edges or loose weft picks. Every weaving cycle depends on this coordination to maintain the speed of production. Modern looms use optical sensors to detect the exact moment of yarn arrival.
Timing Boundary
Variations in the pick arrival angle indicate potential issues with the air supply or the yarn quality. A late arrival might signal a drop in line pressure or a thick spot in the yarn. Corrective measures include cleaning the nozzles or checking the compressor output.
