| 摘要 |
PROBLEM TO BE SOLVED: To improve the tightness of stitches in both left/right needle locations respectively and prevent the stitch skipping, when a needle bar swings between a right needle swing position and a left needle swing position. SOLUTION: A driving force transmission system 50 transmitting a rotating driving force from a lower shaft 48 to a rotating shuttle 8 is provided with a second phase adjusting mechanism 51 capable of transmitting the rotating driving force of the lower shaft 48 and adjusting the rotation phase of the rotating shuttle 8 to the lower shaft 48 by being interlocked with the swing of the needle bar; the driving force transmission system 50 is provided with a driving gear 60 fixed to first and second shuttle driving shafts 56 and 58 and the lower shaft 48, and a driven gear 61 axially movably and externally fitted around the second shuttle driving shaft 58 and threadedly engaged with the driving gear 60; and the second phase adjusting mechanism 51 is provided with a helical spline external tooth 56a formed in the right end of the first shuttle driving shaft 56, a helical spline internal tooth 61c formed in the driven gear 61, and a moving driving mechanism 65 movingly driving the driven gear 61 in the axial direction by being interlocked with the swing of the needle bar. COPYRIGHT: (C)2006,JPO&NCIPI
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