1. Machine bent pins, needles, needle screw loose replace needle, tighten the screws.
2. The hook and the needle must not adjust the hook position.
3. Hook and needle tie too tightly regulating the hook and needle position.
4. Hook gear gap is too large to readjust gears in the box clearance.
5. Needle out signals are not allowed to adjust needle on canvas oil on canvas height position encoder.
6. Head of the needle without synchronous adjustment needle at the same time in and out of the well head oil on canvas.