Patent ID: 7966955

Claim:
A multi-needle embroidery sewing machine comprising: a plurality of needle bars; a second engagement portion provided on a predetermined needle bar of the plurality of needle bars; and a detachable boring device that is attached to a lower end of the predetermined needle bar, wherein: the boring device comprises a boring knife that makes a cut in a work cloth and a first engagement portion that is engaged with the second engagement portion; the second engagement portion restricts horizontal rotation of the boring device; a horizontal position of the boring knife with respect to the predetermined needle bar is determined when the first engagement portion is engaged with the second engagement portion; the boring device further comprises an attachment portion configured to fix the boring device to the lower end of the predetermined needle bar; and the multi-needle embroidery sewing machine further comprises an interference member that interferes with the attachment portion when the boring device is attached to the lower end of a needle bar other than the predetermined needle bar, thereby restricting the attachment of the boring device to the needle bar other than the predetermined needle bar.