| 摘要 |
A boring device that can be attached to and detached from a lower end of one of a plurality of needle bars provided on a multi-needle embroidery sewing machine, and includes a boring knife that makes a cut in a work cloth and a first engagement portion to be engaged with a second engagement portion provided on the one of a plurality of the needle bars. The second engagement portion restricts horizontal rotation of the boring device, and a horizontal position of the boring knife with respect to the one of the needle bars is determined when the first engagement portion is engaged with the second engagement portion.
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