Control system for stopping sewing machine needle at predetermined position
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United States of America Patent
Stats
-
Oct 15, 1991
Grant Date -
N/A
app pub date -
Dec 1, 1989
filing date -
Dec 2, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system is provided for stopping a sewing machine needle at a predetermined position within its reciprocating path. An upper drive shaft rotating at a given rotational speed tends to decrease towards a predetermined lower rotational speed, responsive to a stop command signal. An electric motor is deenergized once the rotational speed reaches the predetermined value, and after that the upper drive shaft continues to rotate by inertia. A pulse number to be generated during the inertia rotation will be determined by an inclination of decrease of rotational speed. Another pulse number to be generated during a period when the stop command signal is generated and when the upper drive shaft rotational speed reaches the predetermined value is determined by application of a selective one or combination of prescribed fuzzy rules, so that the upper drive shaft will come to a standstill at a predetermined position or rotational angle, which governs the predetermined position of the needle.
First Claim
Family
International Classification(s)
Cited Art Landscape
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