Brother Kogyo Kabushiki-Kaisha

Yoshiharu Higuchi

Kazuhisa Ito

Shushin Mori

Ikuzo Kondo

Satoshige Yoneji

Tomoyuki Fujita

A sewing machine control device performs a closed loop control of an induction motor without using an encoder for detecting the motor speed. The control device includes an inverter for driving the induction motor, and controls the inverter output so that the actual speed of the motor is brought into coincidence with a target speed instructed from a speed instruction device. When the control device executes the inverter control, it uses not only the target speed fed from the speed instruction device but also a detection signal generated from a needle position detector that represents the position of a needle bar and the moving speed thereof.

Sewing machine control device with an inverter for controlling an

A sewing system includes a plurality of sewing machines and a managing apparatus for managing sewing operations of the sewing machines. The managing apparatus determines a type of a work to be sewn by each of the sewing machines and sewing steps for such work, and supplies an identification code thereof to the sewing machines. A controller of the sewing machine reads out sewing data corresponding to the identification code from sewing data storage, and controls the sewing machine in accordance with the sewing data.

Sewing management system for a plurality of sewing machines

A sewing machine including a mercury switch for detecting tilt of the sewing machine. When the tilt of the sewing machine is detected by the mercury switch, a machine motor of the sewing machine is inhibited from being driven. Accordingly, even if a foot switch for driving the machine motor is depressed under the tilted condition of the sewing machine, the machine motor is not driven, thereby improving the safety of the machine. Furthermore, when the sewing machine is tilted during driving of the machine motor, the inhibition of drive of the machine motor is canceled, and a driving speed of the machine motor is set to a low speed. Under this condition, an operator can easily adjust a fabric feeding device, a thread cutting device and a rotating hook.

Motor driving device for sewing machine

A control system for a sewing machine includes at least an impulse generating circuit and a counter means connected thereto. A shift register having at least four bits and a mode selecting circuit connected thereto is provided. A circuit for feeding the work material or fabric forwards, a circuit for feeding the work material backwards, and a circuit for resetting these circuits are provided. The system is:

Control system for a sewing machine

An improved speed controlling system for an electric motor, mainly used in a sewing machine includes a motor connected to a power supply, a speed controlling circuit or circuits for operating the motor at variably controlled speeds, and an electrical braking circuit or circuits for braking the motor upon receiving deceleration command from the speed controlling circuit(s) to transfer the motor from a high speed running state to a low speed running one. Electromechanical braking means are provided for acting on the motor, during at least a part of the braking period, the braking means being controlled by the electrical braking circuit(s). A low speed setting circuit is disposed in the speed controlling circuit(s) for maintaining the low speed running state caused by the electromechanical braking means and the electrical braking circuit(s). A stoppage commanding circuit is provided for stopping the motor operation, after the motor has been transferred to its low speed running state by a low speed setting circuit, by means of actuating again, owing to a stopping command, the electrical braking circuit(s) and/or the electromechanical braking means.

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Yokkaichi, Japan

Yoshiharu Higuchi