| 摘要 |
PROBLEM TO BE SOLVED: To prevent rattling, burning, thread cutting, or the like, of whole devices by forming an almost uniform composite plating skin of eutectoid of nickel or a nickel based alloy and fluorine containing compound microparticles on the surface of a sewing machine metallic part. SOLUTION: A rotary shuttle device A as a sewing machine part to be in contact with thread or cloth comprises an inner shuttle 1 and an outer shuttle 2. The inner shuttle 1 is equipped with a rail 11 on the outer periphery face 1a and a storage room 12 and a stud 13 inside. On the whole surfaces of such rotary shuttle device, a composite plating skin of eutectoid of nickel or a nickel based alloy and fluorine containing microparticles is formed. It is also preferable to form the composite plating skin on only the rotation sliding positions of the rotary shuttle device A, i.e., the inner periphery face 2b of the outer shuttle, the outer periphery face 1a and the inner periphery face 1b of the inner shuttle 1, and the outer face 13a of the stud 13. As the nickel based alloy to form eutectoid with fluorine containing compound microparticles, a ternary nickel- phosphorus-tungsten alloy, or the like, is used.
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