What are the steps for threading a flat car sewing machine?

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material. The sewing machine can sew fabrics such as cotton, fiber crops, silk, wool, and artificial fibers, and products such as leather, plastics, and paper.
1.

The thread passes from the bobbin into the top of the machine, passes through the thread eyelet, and passes through the thread pressing spring on the top of the machine;
2. After the third eye, the wire passing rod is first lowered, then upper, and then lowered to the thread pressing spring of the machine head;
3. The over-pressure wire spring passes through the jumper rod again, and the wire hook must be passed through the wire jumper before passing through the jumper rod;
4.

When the jumper rod comes out, it should be stuck in the thread hook and then thread the needle.

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