| 摘要 |
PROBLEM TO BE SOLVED: To enable a sewing machine to sew well using a bobbin. SOLUTION: The bobbin changer and the automatic bobbin thread feeder are structured so that vibration of a bobbin 7 in stand-by before sewing after thread hanging and cutting of wound bobbin thread 150 is restricted by bobbin restricting means such as a clutch mechanism 50a, a cylinder head 75b, etc. to prevent the bobbin thread 150 wound in the bobbin 7 from being swollen and loosened by vibration even when vibration is transmitted to the bobbin thread wound bobbin 7. COPYRIGHT: (C)2005,JPO&NCIPI
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