Journal of the Textile Machinery Society of Japan

A New System Converter

Part 1: Tow Cutting on SUMNER's System and its Staple Diagram

Masataka Yamaguchi

1971 Volume 17 Issue 3 Pages 77-81
Published: 1971
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.17.77

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A new system converter with a revolving circular plate has been devised. The revolving circular cutter is designed to cut a twisting tow along the center axis.
This system can provide a uniform and suitable length of staples for all spinning machines ever in use.
This converter can comply with the currently used tow, e.g., 25×10 to 400×10 denier, and produces 28mm to 205mm length of staples.
This system requires no strictly rigid build.

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Mathematical Considerations of Weft Knitting Process

Noboru Aisaka

1971 Volume 17 Issue 3 Pages 82-91
Published: 1971
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.17.82

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The mathematical model of weft knitting process is formulated on the assumptions led from the knowledges obtained from the analysis of the knitting tension which was made in the previous reports. This model can be used to analyse the yarn motion in the knitting zone and the variation of yarn tension during knitting.
The results obtained by this model are:
(1) The upper the needle ascends from the step line of the stitch cam, the oftener the robbing back occurs. The lower the yarn tension is, the nearer to the feeding side the robbing back occurs.
(2) The shorter the length of the cam step is, the lower the knitting tension and the flatter the shape of the tension distribution is.
(3) To lower the knitting tension and decrease the tension variation, the cam track has to be so designed that the step of a stitch cam is short in length and that the motion of needles which left the step is controlled positively.

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Study on the Hand

Part 2: The Method for Measuring Hand

Tatsuki Matsuo, Norihisa Nasu, Minoru Saito

1971 Volume 17 Issue 3 Pages 92-104
Published: 1971
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.17.92

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There have been many studies on the hand. Not many of their results, however, can be applied to the industrial uses. In this paper, a system for measuring the hand is presented.
1. A difinition of the hand is given and its criterion is arranged as shown in Fig. 1.
2. The new concept “the basic mechanical properties” is presented, which should be the representatives of the mechanical properties of fabrics. Their measuring methods are summarized in Table 2.
3. An equation relating the basic mechanical properties to hand is derived on the basis of Weber-Fechner's law; Y_i=2.30/α_ilog₁₀X_i/X_si where Y_i is the sensibility of the hand corresponding to the basic mechanical property A_i, X_i is the measured value of A_i, α_i is the sensory differential limen and X_si is the standard value of A_i.
4. The differential limens and the standard values of the basic mechanical properties are presented in numerals in Table 6.
5. The numerical and graphical method for expressing the results of measurements are discussed. An example of the applications of this method to the practical use is given.

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