| 摘要 |
PURPOSE: A bottom yarn feeding device for sewing machine is provided to increase winding amount of bottom yarns by extending lengths of bobbin or bobbin case, in which bottom yarns for sewing fabrics are wound. CONSTITUTION: The bottom yarn feeding device for sewing machine includes a driving shaft; an outer shuttle; an inner shuttle, a bobbin case; and a moving bar. In the driving shaft(210), an inserting projection(212) is formed in one end and a penetration hole(211) is formed in the central part. A fitting hole(222), in which the inserting projection is combined, is formed in one side of the outer shuttle, and a point(221) is installed in the external circumference. The inner shuttle(230) is installed inside the outer shuttle(220) to be possibly rotatable. In the bobbin case, a magnet(250) for bobbin case is installed in both end parts, respectively. In the moving bar(270), a connection rod(271) inserted into the penetration hole is installed.
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