Importance

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Abstract

A button sewing machine includes a table which is reciprocated, and which is moved at a right angle to the direction of reciprocation by use of motors, instead of by a mechanical movement and a ROM (read-only memory) as found in conventional machines. The desired changes in stitch number and, in particular, a button sewing on pattern, are controlled automatically by making use of an electronic control device. Needle drop positions at which a deep stitch (show stitch) and a shallow stitch (ordinary stitch) are to be carried out are established by the use of two cylinders. Once a neck thread is sewn, during forward movement of the table the middle of the neck thread is wrapped and then during rearward movement of the table the outside of the neck thread is wrapped, or, the outside of the neck thread is wrapped during the forward movement and the middle of the neck thread is wrapped during the rearward movement, or only the outside of the neck thread is wrapped during both the forward movement and the rearward movement of the table. Then, as a last step, the wrapped or bunched part is subject to end stitching. This apparatus dispenses with the replacement of cams and ROMs that wear out in conventional sewing machines.

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First Claim