| 摘要 |
PROBLEM TO BE SOLVED: To stabilize tension of a bobbin thread by sufficient spring force of a tension spring provided at a bobbin case always, to decrease the probability that a sewing needle penetrates the bobbin thread from a bobbin-thread outlet of the bobbin case to a pinhole of a throat plate and to securely prevent forming of hitch stitches regardless of a seaming direction. SOLUTION: A bobbin-thread through hole 3d is formed in a locking wall part 3c of a bobbin-thread guide part 3a integrally formed at a middle case 3 of the vertical full-rotation shuttle 1. A swelling part 3f swelling backward is formed on the back of an upper end of the wall part 3c above the through hole 3d. The bobbin thread DT drawn outside the outlet 19 of the bobbin case 4 through a bobbin-thread guide member 20 is inserted into the through hole 3d from the front of a bobbin-thread guide part 3a to be guided by the expansion part 3f, passing through the pinhole 5a of the throat plate 5 and connecting with a processed fabric W on the throat plate 5. COPYRIGHT: (C)2008,JPO&INPIT
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