Sewing – Special machines – Darning
Patent
1983-12-29
1985-10-08
Nerbun, Peter
Sewing
Special machines
Darning
1122621, 112315, 112272, D05B 1900
Patent
active
045453101
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.
REFERENCES:
patent: 4154179 (1979-05-01), Arnold
patent: 4381719 (1983-05-01), Goldbeck
patent: 4404919 (1983-09-01), Martell et al.
Isett Donald D.
Treadwell Stephen S.
Howison Gregory M.
Microdynamics, Inc.
Mills Jerry W.
Nerbun Peter
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