| 摘要 |
PROBLEM TO BE SOLVED: To provide a lock-stitch sewing machine for achieving sufficient sealing by sewing up without using a secondary material such as waterproof tape or the like. SOLUTION: An lock-stitch sewing machine has N-needles and N + 1 threads, wherein N needles are arranged in a stitch direction. Thus, it is possible to have fine seams so as to prevent liquid from leaking from gaps of the seams. Thereby, sufficient sealing can be achieved by sewing once without using the secondary material such as the waterproof tape or the like, and without performing sewing two or more times. COPYRIGHT: (C)2004,JPO
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