free end 56 of the bill of the looper see fig4 and 5 element 22 is a rocking arm secured to the knife shaft 2 and at the front side of the arm a knife bar 26 is fixed and on the knife bar 26 a plurality of knives 24 extending upwardly are secured to a knife block 25 and the upper end of a knife touches the side of the corresponding looper mounted above it so that as the knife bar 26 is reciprocably driven by the knife shaft 2 the knives mounted thereon cooperatively engage with respective loopers 20 to cut the selected loop seized on the various loopers to form cut pile 27 as hereafter described in the preferred embodiment as illustrated in fig2 and 3 there are three flanges 28 29 and 30 on the upper side of the looper block 19 paralled to each other and laterally extending and two paralled channels 31 and 32 are provided between them on front flange 28 and middle flange 29 a plurality of vertical thin through slits 34 and 35 are provided at the same regular interval as the gauge of row stitching for a shank 33 of the looper 20 to push in and be slidingly supported on a back flange 30 a plurality of small through holes are provided each hole being in a straight line extending from two slits 34 and 35 to pass a wire 36 through the back end 38 of the shank 33 of each looper see fig3 5 is pushed in the slits 34 and 35 and is pivotably connected with a pin 39 to a connecting piece 40 which is connected to the end of the wire 36 the other end of.