Projectile Loom Shedding and Beat-Up Systems
topic
Projectile loom shedding uses cam or dobby shedding for the standard 8 to 12 shaft constructions used in most technical fabric applications, with the long shed required for projectile flight across wide machine widths requiring large heald frame stroke and precise shed timing that provides adequate projectile clearance above and below the warp sheet without warp thread contact that would damage yarn or deflect the projectile.
Role
Provides the shed geometry for projectile flight across wide machine widths that must maintain adequate clearance for the projectile carrier height above the bottom shed line while providing sufficient shed opening for projectile entry and exit without deflection, with shed angle and timing being more critical on wide-width looms where small angular deviations create proportionally larger absolute clearance variations.