Single-Rapier and Double-Rapier Insertion Principles
topic
Single-rapier systems carry the weft yarn from one selvedge all the way across the full shed width to the opposite selvedge in a single pass, requiring a rapier travel equal to the full fabric width, while double-rapier systems use two rapiers entering from opposite selvedges that meet at the centre of the shed for yarn transfer from the giving rapier head to the receiving rapier head, with each rapier traveling only half the fabric width and enabling higher insertion rates from the reduced rapier travel distance per pick.
Role
Defines two fundamental rapier insertion architectures with different productivity and mechanical characteristics, with double-rapier being the dominant commercial design from its higher insertion rate from reduced rapier travel and more positive yarn control through the defined transfer point, while single-rapier provides simpler mechanical construction for applications where the modestly lower insertion rate is acceptable and where the absence of a transfer point eliminates the yarn damage risk at the centre transfer.