Electric sewing machine circuit

Convert an ordinary sewing machine into an electric sewing machine to save labor, time and increase speed. The circuit
    of the modified electric sewing machine is shown in Figure 1-43. In solid, sQ is the travel switch and S is the micro switch. Adjust the RP adjustable potentiometer to reduce the motor speed by about half. When in use, the foot switch is activated, the travel switch S is closed, the motor runs at half the rated speed, the sewing machine rotates slowly, and the micro switch S is closed; the potentiometer is short-circuited, the motor runs at the rated speed, and the sewing machine rotates at high speed.     If an AC motor or fan motor is used, the reactor of the electric fan replaces the adjustable potentiometer in the figure. If the wiper motor of Beijing Jeep is used to drive the sewing machine, a 1ZV, 1A low-voltage DC power supply should be used. At this time, a transformer can be used to step down the voltage and a diode can be used for rectification. The low-voltage direct current obtained is low-voltage electricity, so it is safe to use the modified sewing machine. If possible, install a thyristor speed regulator to make the modified electric sewing machine more ideal. The modified sewing machine should be connected to the ground wire and pay attention to the safety of electricity.