Normally on a sewing machine, You sew in one direction. You sew seams going in one direction. If you want to make a button hole, you dial the button hole setting. Sometimes, there are little places where you want to have thread go back and forth across a few spots. At those places you use the reverse lever. It changes the direction it makes the material go through the machine.
At one time, you had to use the reverse lever to make your own button holes or to do your own embroidery.
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You find the lever that will lift them. It is on the back of the arm of the machine.
theory of sewing machine
sewing machine:) A sewing machine uses thread to fasten fabric together. A sowing machine plants seeds.
what is the function of the head of the sewing machine
The difference between an electric sewing machine and a manual sewing machine is only the method of propulsion. The electric machine uses an electric motor, while the manual machine uses a hand crank or foot pump to power it. The actual sewing machine is the same.