Needle bar movement mechanism of sewing machine
grabcad
Connecting the double slider mechanism with the crank slider mechanism creates a new system that's used in sewing machines to move the needle bar. By adjusting the distance between the connecting rod and the hinges of the two sliders, you can alter the stroke length of the needle bar itself. This principle is what makes it possible for the needle bar to move up and down in synchronization with the machine's operation.
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