Importance

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Abstract

A sewing machine includes: a sewing needle, holding an upper thread; an upper thread tension adjustment mechanism, adjusting a tension of the upper thread; a shuttle cooperating with the sewing needle to form a seam; a feed mechanism, in which endless feed belts feeding a sewing object disposed at a sewing position along a first direction are disposed on two sides with respect to the sewing position in a second direction orthogonal to the first direction, and in which a belt drive part independently driving the feed belts on two sides with respect to the sewing position in the second direction is provided; and a control part, controlling the mechanism, so that, from beginning to end of sewing, a tension of the upper thread varies in an amount according to a difference between feed amounts of the feed belts.

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First Claim