Sewing machine-driving apparatus
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United States of America Patent
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-
Sep 15, 1992
Grant Date -
N/A
app pub date -
Jul 9, 1991
filing date -
Jul 16, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A sewing machine-driving apparatus forms an accurate and stable seam at a first stitch in a conventional double chain stitch or covering chain stitch sewing machine. Its motor is controlled so as to drive the sewing machine in a direction reverse to that of the usual sewing operation for a limited time period between the completion of a thread cutting operation and a point of time when the sewing machine needles reach their needle-down position. Thus, the stitching needles reach their lowest points without scooping a looper thread at the first stitch; assuring the formation of a stable and accurate seam in the second stitch.
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