| 摘要 |
PROBLEM TO BE SOLVED: To prevent a bobbin thread from surfacing on a cloth piece in an embroidery sewing machine having a sound needle thread when sewing is restarted by returning an embroidery frame when a needle thread of one embroidery sewing machine is broken. SOLUTION: A plurality of embroidery sewing machines including embroidery function are provided interlockingly with each other, whereby when a needle thread of one embroidery sewing machine is broken in the course of sewing, the plurality of embroidery sewing machines and embroidery frames are stopped in a plurality of stitches, and the embroidery frames are returned to the thread breakage portion to restart sewing, in the embroidery sewing machine having a sound needle thread which is not broken, the needle thread is slackened in the process of returning the embroidery frames.
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