This paper mainly introduces the simple quality inspection method for some spare parts of medium speed sewing machine.

  1. Needle plate and feed dog

  The needle plate and the feed dog of the medium speed machine are double-row, and the rear half is subjected to a large force. When the operator uses the sewing machine with the inverted feed wrench as the reverse feeding operation, it is easy to inject the needle. The board will collapse, such as the use of good quality needle board is not easy to occur. Inspection method: use a compass knife into the feeding alveolar on the needle board, and shake it from side to side, carefully observe whether the force is deformed, such as deformation That is inferior goods.

    2. Presser foot

 Inspection method: You can use the pliers to bite the presser foot to see if you can bite the imprint. The harder presser foot is hardened, and the pliers can't bite the imprint. (The needle plate and presser foot of the domestic standard GC6-1 type high level machine, The quality of the feed dog is better. The 12481 feed screw fastening screw made in Taiwan has TAI WAN print and 12481 Arabic numerals in the middle of the two holes. This product is sturdy and durable, and the feed tip is not easy to slip.

    3. Needle

 Diamond brand high-grade double-speed, silver-white and nickel-plated needles produced by Shanghai Diamond Needle Factory are selected. Because most sewing products companies use high-speed machines, many sewing products are new waterproof materials and chemical synthetic fibers. The material requires the needle to be resistant to high temperatures. Generally, the chrome-plated needle is not suitable. Even if it is available, the effect is not satisfactory. The Japanese needle is better than the Korean and Japanese piano companies. The surface is smooth and the use time is longer.

     4.Bobbin case

 There is a mark of "q" in the middle of the hook of Japan's Hirose Hook. The printing is fine and uneven, the plating is smooth and soft, and the hand feels smooth and no hair. The left side of the hole inside the hook shell is printed as "N" and the right side is printed as "T". The shovel tip is not easy to appear when it is used. The sham hook frame has a sloshing phenomenon in the bobbin case, the plating surface is bright, and the hand feels burrs. The "q" print on the hook is rough and rough, and the hook tip Hardness is not enough, it is easy to appear bristles and blunt tip when used. The word "MADE IN JAPAN" is printed on the right side of the hook of the Japanese Sawyer. The left side of the hole inside the hook shell is printed as "N" and the right side is printed as "". Y", this brand has not found any counterfeit products. The X-type high-speed rotary hook produced by Shanghai Huasheng Sewing Machine Parts Factory has a fine processing technology, and is similar to the Japanese Hirose HSH-7.94B type. , suitable for high speed sewing machine, the effect is very good.