SEWING MACHINE CONTROLLING APPARATUS

摘要

A sewing machine controlling apparatus which starts and stops a sewing machine or controls its speed in accordance with the position of an adjusting means, e.g. control pedal, for setting a sewing machine speed, as speed. The sewing machine controlled by the controlling apparatus is independent of the influences caused by changes in the pedal position signal PA through the vibrations of the machine or through the variations in a power-supply voltage. A smooth speed switching operation, which is free from speed variations, can be realized even at a stepped switching point of the machine speed control pedal.