supplied to port 94 from air line 25 and permeates bearing 90 to decrease the fricton between ring 86 and bearing 90 and enables ring 86 to rotate with very little frictional resistance the means for withdrawing the weft helically deposited on core 39 comprises a port 96 located adjacent outlet opening 38 and the end of second frusto conical portion 52 port 96 pneumatically connects chamber 36 to high pressure source 22 by means of air line 26 a valve 98 is located in line 26 and upon being opened allows air at super atmospheric pressure to enter port 96 from source 22 valve 98 is opened and closed by a cam 102 mounted on a shaft 104 which is rotated in timed relation with the loom in the same manner as shafts 76 and 84 at the proper time during the loom cycle valve 98 is opened and valves 80 and 72 are closed so that chamber 36 is pressurized from port 96 this forces core 39 to the right as viewed in fig3 and causes portion 50 of the core to seat within portion 46 of the chamber and seal inlet opening 37 from space 40 at the same.