By using simple model, diffusion process of the new products of clothing was analysed. The model was set up on the following two assumptions; (1) new products would be used for a long period, (2) the influence of the users of these new products upon the other people's purchase desire would be always equal. Using this model, variation of the number of people with elapsed time, who had bought this new product, was analysed. Then some equations related to diffusion process of the new products were derived. According to these equations, it was appeared that; (1) N(t)/M, the diffusion rate curve of the new products, formes S-shape curve, so-called logistic curve, (2) F(t)/M, curve of the number of people who buy the new products in a unit time, forms bell-shape curve, which is similar to the normal distribution curve.
Shapes and values of these curves are determined by the value of coefficients α and k. Coefficient α relates to the influence of the users of the new products upon the other people's purchase desire, who have not bought this new product yet. As α increases, the diffusion speed becomes faster. Coefficient k relates to the number of people who possess these new products at the beginning of the sales. As k increases, diffusion of the new products requires long time. For bigger k, the curves of N(t)/M and F(t)/M move to right on the graph, but their shapes do not change.

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The mechanism of the end breakage due to knots (a weaver's knot and a fisherman's knot using a combed cotton yarn c30s/1 cotton count) in the plain-weft knitting zone 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 plain-weft knitting zone occurs in the following three steps:1) jam of knots in the space between a needle-hook and -latch and an old loop, or in the space between a needle-head and a verge, 2) increase in the yarn tension, 3) end breakage due to knots. (2) The end breakage due to an air-splice in the plain-weft knitting zone hardly occurs 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 those due to a weaver's knot under every knitting condition.

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The mechanism of the end breakage due to knots (a weaver's knot and a fisherman's knot using a combed cotton yarn c30s/1 cotton count) in the 1×1 rib knitting zone 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 at 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 does not occurs 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 those due to a weaver's knot under every knitting condition.

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