Method and apparatus for automatically decelerating and stopping a sewing machine motor
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United States of America Patent
Stats
-
Apr 30, 1985
Grant Date -
N/A
app pub date -
Aug 30, 1982
filing date -
Aug 30, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for automatically positioning a reciprocating needle while rotating the motor a minimum number of degrees. Apparatus is provided for sensing the motor angle and comparing it with a preset braking angle. After the braking angle has been reached, the motor is decelerated until it reaches a needle positioning speed, whereupon the motor angle is again sensed and compared to the needle positioning angle. The motor rotates until the needle positioning angle has been reached, whereupon the brake is reapplied to stop the motor at the desired needle position in a minimum time duration without performing an additional stitch.
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Family
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Cited Art Landscape
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