Sewing machine control apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 8, 1987
Grant Date -
N/A
app pub date -
Nov 4, 1986
filing date -
Nov 6, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a control device for a sewing machine control apparatus wherein an electric motor generates a reverse torque against a torque due to a load on the sewing machine in abeyance state, to hold a sewing needle in an upper or a lower position, the reverse torque reaches a maximum value by a known feedback system at its turn to a predetermined revolution angle. The control apparatus is devised such that, when it is further turned in excess of the predetermined revolution angle, the reverse torque falls to zero, hence the driving motor remains at the position turned to the predetermined revolution angle.
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