- Presents the weft yarn: This might involve holding the weft yarn package (like a bobbin) and unwinding the yarn as needed for insertion.
- Prepares the yarn for insertion: Some weft loaders might involve devices for tension control or yarn storage (accumulators) to ensure that the weft yarn is delivered to the insertion mechanism at the proper tension and rate.
- Collaborates with the insertion mechanism: The weft loader acts as a supply system, presenting the yarn to the shuttle, rapier, air nozzle, or water jet that will carry or propel the weft through the shed.
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