1. Needle plate and feed dog The needle plate and feed dog of the medium-speed lockstitch sewing machine are in double rows, and the latter part is stressed. When the operator performs the reverse feeding operation on the sewing machine with the reverse feeding wrench, It is easy to get an injection. If an injection occurs, the needle plate will collapse. If a good quality needle board is used, this phenomenon is not easy to occur. Inspection method: Put the screwdriver into the feed slot on the needle plate and shake it left and right, carefully observe whether it is deformed under force, if it is deformed, it is inferior.
2. Presser foot inspection method: Clamp the presser foot with pliers to see if the print can be caught. For the hardened presser foot, the pliers will not catch the mark. (The quality of the needle plate, presser foot, and feed dog of the domestic standard brand GC6-1 high-level machine is good. The 12481 feed dog made in Taiwan is marked with "TAIWAN" and "12481" between the two holes of the fastening screw. This product is sturdy and durable, and the tip of the cloth feeder is not easy to slip.)
3. Machine needles Most clothing companies use high-speed machines. Many sewing products are made of new waterproof materials and chemical synthetic fiber materials. Therefore, the needles must be resistant to high temperatures. Generally, chrome-plated needles are not suitable, even if they can be used. , The effect is not ideal. The Japanese organ needles are of good quality, smooth surface and longer use time. The diamond high-speed nickel-plated needles produced by Shanghai Diamond Needle Factory are also of good quality.
4. The inferior quality of the rotary hook will shake in the case of the rotary hook, the electroplated surface is bright, and the hand feels burr, the "q" print on the surface of the rotary hook is rough, and the hardness of the hook tip is not enough, easy to use Burrs and blunt tips appear. Good quality hooks include Japan Hirose and Shanghai Huaxin. Japan Hirose rotary hook has a "q" mark in the middle of the surface of the rotary hook. The printing area is finely concave and convex, the electroplating is smooth and soft, and the hand feels smooth and burr-free. The tip of the Hirose hook is not prone to burrs during use. On the right side of the hook surface of the Japanese Zawun hook, the words "MADEINJAPAN" are printed on the surface of the hook. The left side of the inner hole of the hook shell is printed as "N" and the right side is printed as "Y". No counterfeit products of this brand have been found. The I-brand X-30 high-speed rotary hook produced by Shanghai Huaxin Sewing Machine Parts Factory has a finer processing technology. It is similar to the Japanese Hirose HSH-7.94B rotary hook. It is suitable for high-speed lockstitch sewing machines and has a good effect.
