raw cloth(10) being put into a guide gutter(11), going forward along a zig-zag shaped guide frame(12), and being folded in the shape of the frame(12); strings(20) being conveyed by a feeding equipment(2); a cam(17) for turning and a needle(16) for passing through a needle hole(14), piercing he zig-zag folded raw cloth(10); a string supplier(28) for pushing the string(20) toward the guide frame(12) and the middle of the string being hooked by a needle(16); the blade(30) of a string cutting equipment(3) for cutting the string(20); the needle(16) for hooking the string(20) which returns to the original position, having the string(20) which penetrates the raw cloth(10); and a raw cloth(10) going into the cloth flolding equipment(6) to be folded in halves; and being sewed by the sewing equipment(7)(7') and made into a sack(100).
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