Weft Presentation and Cutting in Projectile Looms
topic
Weft presentation systems on projectile looms advance the yarn end from the feeder drum to the projectile gripper jaw position before each pick, with the presenter mechanism aligning the yarn precisely at the gripper jaw for positive pickup, and with the weft cutter severing the weft tail after pick insertion at the picking selvedge to defined tail length, with cutting position accuracy governing tail length consistency and the tucked selvedge quality that binds each weft tail into the following shed.
Role
Governs the reliability of weft pickup by the projectile gripper and the quality of the selvedge formed from the cut weft tail, with presenter mechanism calibration being a regular maintenance requirement that maintains the precise yarn positioning relative to the gripper jaw that ensures consistent gripping force and prevents the grip failures that cause dropped picks or partially inserted picks that create fabric defects.
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