Mandrel for a ball winding machine

Claim 1

A mandrel for winding yarn into self-supporting balls comprising a central rod having a hub at one end, a collar freely movable axially over said rod and a plurality of sets of arms and connecting links pivotly secured between the hub and collar, and shiftable on movement of said collar relative to said rod from a first collapsed position having a small diameter to a second open position having a larger diameter, a plurality of flat blades having an arcuate exterior surface arranged concentrically about said central rod and spaced therefrom, each of said blades being respectively connected at one end to said collar extending cantilevered over said rod with the ends opposite said collar free of connection with each other and said hub and located between adjacent ones of said sets of arms and connecting links, said blades defining a radially resilient cylinder having a diameter intermediate the diameter defined by said arms and links in the first and second position open at the end opposite said collar to form a smooth surface from which yarn wound thereon can be easily doffed.