Invention Grant
US4774899A Speed setting device for an electric sewing machine 失效
电动缝纫机调速装置

Speed setting device for an electric sewing machine
Abstract:
A flat touch switch having plural switch components with rotation speeds of the sewing machine shaft indicated on each component is positioned in the region of the needle bar. Pushing a component part of the switch drives the machine at the indicated speed. A control logic circuit senses the pushed component and by sensing the speed of the driven shaft, drives the machine at the selected speed.
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