What is the reason why industrial sewing machines are always jumpered and how to deal with it? Nowadays, whether it is an industrial sewing machine, an electric sewing machine, or some sewing machines, overwrapping machines, there will be continuous jumper problems. Our approach to such a problem is usually to check the following points to confirm the cause and correct it as follows:
1. The end of the bottom thread is too short, and the thread loop cannot cover the bottom thread; take out the hook and pull out the bottom thread about 10 cm
2. After long-term use of the needle, or improper maintenance or maintenance, the position of the parts changes, and the sewing requirements are not met; change the qualified parts according to the request, adjust the needle bar up and down position, the distance between the needle and the hook tip, gap.
3. The upper thread becomes hot due to the heat of the needle; the chemical fiber thread should be cooled by the machine needle (silicone oil)
4. When sewing special materials, the coil cannot be formed normally; the sewing speed should be slowed down and the lubricity of the upper thread should be increased
5. Equipped with an automatic thread trimming shoe machine. After trimming, the needle thread is too short and the upper thread comes out of the needle eye; adjusts the timing of the trimming cam
6. The presser foot groove is too wide. When the needle-punched cloth is withdrawn, the sewing material will move and affect the loop. This situation will have a large impact when making thin materials; according to the sewing material, move the presser foot to the left, right, or wide groove Fill up with solder and then open a narrower groove, and polish or change the qualified presser foot.
