Electrically driven sewing machine control apparatus

Sewing – Elements – Starting or stopping

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Details

D05B 6922

Patent

active

040785076

ABSTRACT:
A motor control apparatus for driving a power sewing machine comprises a main motor circuit for supplying a motor current to a DC motor from an AC power supply through a main switch and a semiconductor element with a control electrode, a controller for controlling the speed of the motor, a first control means for effecting normal stitching by controlling the conduction state of the semiconductor element, a second control means for effecting a single stitch by controlling the conduction state of the semiconductor element, and a means for switching the operation between the first and second control means. The second control means includes a needle position detector means for detecting the needle to reach predetermined positions, a switching means connected in series to the needle position detector means, a trigger voltage supply means for applying a trigger voltage to the control electrode of the semiconductor element, and a switch-operating means. The switch-operating means operates in such a manner that, when the main switch is closed without the depression of the controller, the switching means is closed, while upon the depression of the controller, the switching means is opened for predetermined time and thereafter to close again upon the lapse of said predetermined time. If the needle position detector means detects that the needle has reached the predetermined positions with the switching means closed, the trigger voltage supply means is made ineffective.

REFERENCES:
patent: 3209713 (1965-10-01), Cohen et al.
patent: 3622854 (1971-11-01), Imai et al.
patent: 3780681 (1973-12-01), Sasaki
patent: 3987739 (1976-10-01), Wurst et al.

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