| 摘要 |
The invention provides a sewing machine which comprises needle 1 that moves up and down while sticking into a cloth W on a needle plate and a looper 2 that projects and withdraws under the needle plate so that the looper 2 projects to catch a needle thread 10 left under the needle plate in accordance with the rise of the needle 1 and draw out the thread in accordance with the feeding of the cloth W, and on the other hand, the needle 1 falls to catch the looper thread left under the needle plate upon the withdrawal of the looper 2, whereby multi-thread chain stitches or covering stitches are formed, wherein a retainer rod 30 is provided which projects and withdraws backward and forward within a plane roughly in parallel with the feed surface of the cloth W while interlocked with the rise and fall of the needle 1, and this retainer rod 30 catches the looper thread 20 at the projection side of the looper 2 ahead of the needle 1 when projecting rearward, and holds the caught looper thread 20 between the rod and needle 1 under tension.
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