Mechanism of end breakage due to knot in knitting zone of 1×1 rib

Abstract

The mechanism of the end breakage due to knots (a weaver's knot and a fisherman's knot in the 1×1 rib knitting zone using a combed cotton yarn c30s/1cotton count) is investigated in detail, using a high speed video camera. The results obtained are as follows : (1) It clarifies that the end breakage due to knots in the 1×1 rib knitting zone occurs in the following three steps: 1) jam of knots on a cylinder needle-hook, 2) increase in the yarn tension, 3) end breakage due to knots. (2) The end breakage due to an air-splice in the 1×1 rib knitting zone is not occurred under every knitting condition. (3) The rate of jammed knots, the end breakage rate for jammed knots and that for knots increase with the increase of the depth of stitch draw, the input tension and the take-down weight for any knot. (4) The rate of jammed knots, the end breakage rate for jammed knots and that for knots due to a fisherman's knot are always more than these due to a weaver's knot under every knitting condition.