Abstract
The sewing needle-temperature rises considerably in accordance with increase of machine velocity and the number of fabric layers. The temperature rises under constant number of fabric layers increases rapidly first and then slowly, and may level off at very high machine velocity. The dependence of the temperature rise under constant machine velocity on the number of fabric layers has also similar behaviors described above.The complex shape of the needle is simplified as a semi-infinite rod having a uniform cross-sectional area. Then, it was derived the reasonable formula of the needle-temperature rises as a function of machine velocity and the number of fabric layers during the sewing without thread. This formula explains the relationship between the heat generation for a needle to move in and out of fabrics and the heat dissipation from the needle surface. The dissipation involves both the heat transfer to air and the heat transmission to fabrics. The formula has well-agreed not only with the experimental results but also with those reported in the literature.
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