Control apparatus for sewing machine with automatic needle stopp

Details Control apparatus for sewing machine with automatic needle stopp Control apparatus for sewing machine with automatic needle stopp

1975-05-12

1977-03-29

Schroeder, Werner H.

Sewing

With tables or stands

For plural sewing units

D05B 6918

Patent

active

040142779

ABSTRACT:
A control apparatus for sewing machine with automatic needle stopping means comprises a motor for supplying a driving force to a sewing machine, a speed control device for controlling the rotational speed of the motor by controlling a driving thyristor connected to the motor, a position detector unit for detecting the position of a sewing machine needle, a braking unit for applying a braking force to the motor to stop the motor and the sewing machine at a predetermined position, and a pedal manipulated by an operator for manipulating the sewing machine. The speed control device comprises a speed command means including a speed detector means resetable by an output signal from the position detector unit for detecting the motor speed, and a counter means having inputs setable by electrical signals generated in response to the manipulation of the pedal, a given sewing cycle being performed by output signals of the counter means.

REFERENCES:
patent: 3074632 (1963-01-01), Braun et al.
patent: 3209713 (1965-10-01), Cohen et al.
patent: 3757232 (1973-09-01), Matsuda

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