are engaged by shafts 12 and 13 as will be seen from fig9 band like member or ribbon 24 is engageable with shaft 12 and drives puller or plunger 28 in channel 16 and band like member or ribbon 25 is engageable with shaft 13 and drives puller or plunger 29 in channel or pocket 17 with reference to fig1 a a clamp 20 is shown and it is to be understood that the same structure may be used for clamps 21 and 22 clamp 20 comprises an inner solid cylindrical member 72 through which diametric bores 74 are made for yarn strands s an outer cylindrical sleeve 76 has bores 78 alignable with the bores 74 of the inner solid cylindrical member 72 relative motion between member 72 and sleeve 76 will cause the yarn to be clamped although movement cannot be so great as to shear the yarn strands each of the yarn strands s is fed through a separate feeding unit to a different needle 40 as will be clear from the following description with reference to fig2 4 the mechanism which causes the engagement of band 24 which drives the puller in channel 16 by means of oscillating drive shaft or tube 12 is shown the band or ribbon is contained in channel 18 and while it may slide it will not bend when subjected to compression forces as will be seen from fig5 and 9 the band or ribbon 24 extends to plunger 28 which is.