51 which is connected by a link 52 to the rock arm of a feed rock shaft 54 for imparting feed and return motion to the feed dogs not shown alternately with the lifting and falling action imparted by cam 24 referring to fig6 on the end of the lower shaft 45 opposite the sprocket 44 there is supported a crank 60 and spaced inwardly thereof a cam disk 62 the crank 60 is connected by way of connecting rod 61 to a lug 64 transverse of and affixed to an upright needle looper assembly 66 by means of screw 65 the needle looper assembly 66 is urged in vertical endwise reciprocation by the crank 60 and connecting rod 61 within bearings provided in appendages 68 affixed to an adjacent extension 47 the needle looper assembly 66 includes a tube 72 which slides within bearings in the appendages 68 the tube having a constricted bore at the upper end to receive an outer needle bar 75 therein the outer needle bar 75 is fashioned with a hollow interior and at the end thereof tapers to a point 76 at a shallow angle so as to provide ready penetration of a work material see fig2 approximately midway of the taper there is formed a scallop 78 for a purpose to be explained below internally of the outer needle bar 75 there is situated a rod like.