Control system for sewing machine
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United States of America Patent
Stats
-
Nov 23, 1982
Grant Date -
N/A
app pub date -
Jul 14, 1980
filing date -
Jul 14, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A semiautomatic sewing system (10) comprises a sewing machine (12), a drive unit (42) including a variable speed motor and encoder for counting stitches sewn, material edge sensors (40) mounted in spaced relationship in front of the needle (22) of the sewing machine, and a microprocessor controller (51) coupled to the sewing machine controls. Accurate control of seam lengths and end points is achieved by initiating countdown of a variable preprogrammed number of final stitches responsive to material edges detected by the sensors (40) only when the stitch count falls within a predetermined window of values so that inaccuracies from stitch counting are limited to a small portion of the overall seam length. If the sensors (40) do not detect a material edge within the window of stitch values, the sewing system (10) reverts to pure stitch counting to determine seam length.
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Family
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Cited Art Landscape
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