How to solve jumper problems

(1) Check whether the upper thread has been threaded wrongly or missed a certain thread position.

(2) Check whether the needle is installed correctly, such as the long groove of the needle is installed reversely or skewed.

(3) Check whether the needle model is applicable, whether the height of the needle bar adjustment is accurate, and check whether the needle is close to the top of the needle bar. If the needle is installed too high or too low, it will affect the hook thread.

(4) Check whether the needle is distorted. When sewing with a distorted needle, the hook cannot pick up the suture because the loop formed is far away from the hook. Slightly bent needles are difficult to identify directly with the naked eye, and can be identified by turning the needle on the platform.

(5) Check whether the movement time of the needle and the hook coincide. The movement time of the needle and the hook is fully matched, so that the hook can accurately hook the suture.

(6) Check whether the thickness of the needle and the sewing thread are appropriate. The use of a large needle with a thin sewing thread will also cause the thread to jump. This is because the needle eye of the large machine needle is longer and wider, and the hole position for piercing the fabric is larger, so that the thin sewing thread has a larger space to move. If it exceeds the hook and hook thread range, a jumper will appear;

(7) Check whether the needle eye of the machine needle is blocked due to the melting of chemical fiber sewing thread scraps, so that the suture cannot be conveyed normally and cannot form a loop.