Shed Geometry for Different Weft Insertion Systems
topic
Weft insertion system requirements impose different shed geometry specifications, with rapier systems requiring clear physical clearance for the rapier head at the full shed width that necessitates specific minimum shed height and entry angle, air-jet requiring adequate clearance above the profiled reed channel for air flow and yarn passage without shed entry constraints, and projectile requiring the guide tooth channel within the shed height range for projectile flight path maintenance that constrains shed line positions relative to guide tooth geometry.
Role
Establishes the weft insertion mechanism-specific constraints on achievable shed geometry that prevent universal shed optimisation independent of insertion system, requiring shed geometry optimisation to begin with the insertion system clearance requirements as the lower bound on shed height before optimising within the remaining range for minimum warp extension, and making shed geometry the link between insertion mechanism selection and warp tension management that connects these two aspects of loom process optimisation.