A sewing machine is usually composed of many spare parts. The quality of the spare parts is crucial to whether the sewing machine can be used normally and achieve the highest working efficiency.
Needle plate and fabric feed dog
The needle plate and fabric feed dog of medium-speed needle sewing machines are double-rowed, with the rear part bearing greater force. When the operator uses a sewing machine with a reverse feed lever to perform reverse feeding, it is easy to cause needle breakage. If needle breakage occurs, the needle plate may sag. Using a high-quality needle plate can help prevent this issue.
Testing method: Insert a hacksaw blade into the groove of the fabric feed teeth on the needle plate and shake it left and right. Observe carefully if it deforms under stress. If deformation occurs, it is an inferior product. Therefore, it is important to choose high-quality computerized needle sewing machine components.
Presser foot
The presser foot holds the fabric in place while sewing, and it should be able to apply adequate pressure needed for the sewing application. A good quality presser foot should be adjustable so that it can provide the appropriate pressure needed for different types of fabrics.
Testing method: You can use pliers to grip the presser foot and see if it leaves any marks when bitten. The presser foot of high-hardness needle sewing machines, which have been hardened by quenching, will not leave marks when gripped. This type of presser foot is suitable for various computerized needle sewing machines.
Machine needles
Most sewing product manufacturers use high-speed needle sewing machines, and many sewing products are made of new waterproof materials and chemically synthesized fiber materials. Therefore, computerized needle sewing machine needles must be heat-resistant. Generally, chrome-plated needles are not suitable, and even if they can be used, the results are not ideal.
Rotary hook
The rotary hook plays an important role in computerized needle sewing machine components. It has a bright electroplated surface with a slightly rough texture. The printing on the rotary hook's surface is rough and uneven. If the hardness of the rotary hook tip is insufficient, it can lead to rough edges and dull tips during use.
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