Four stitches and six threads, all socks will break.

What you want to ask is why all socks are broken on a four-needle six-thread sewing machine?

1, the thread is too tight, and the adjusting screw in front of the nose can be adjusted.

2. There is fiber fluff in the shuttle, and the fluff and the thread are intertwined, which makes the thread thicker and can't pass through the pinhole, resulting in thread breakage. Clean up around the shuttle.