Method and apparatus for accurately controlling the seam margins produced by a semi-automatic sewing machine
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United States of America Patent
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-
Oct 8, 1985
Grant Date -
N/A
app pub date -
Dec 29, 1983
filing date -
Dec 29, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An adaptive semi-automatic sewing system (10) comprises a sewing machine (12), a drive unit (42) including a variable speed direct drive motor and encoder for counting stitches sewn and for sensing the rotation of the motor, at least one material edge sensor (40) mounted ahead 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 number of final stitches responsive to detection of the material edge by the sensors (40). The amount of stitch completion at the time of detection of the material edge is monitored and a stitch length variance mechanism (17) is actuated at a selected angle of motor rotation taking into account the time delay of the stitch length variance mechanism and the feed characteristics of sewing machine (12) to precisely control the length of the last stitch sewn to improve the accuracy of the seam end point.
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