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1. Polyester thread problem: Keyi checks whether the quality of the polyester thread is qualified, and whether the selected polyester thread matches the needle. Also, check if the tension of the upper thread is too tight, because the tension is too tight and it is easy to break. Finally, pay attention to whether the needle hole is silted up, which will cause the polyester thread to break due to poor conveyance.
2. Needle problem: It is necessary to check whether there is a phenomenon that the needle is hot-melted, especially when using chemical fiber suture, because the sewing machine runs at high speed, the needle repeats the friction of the fabric to generate heat, so that the chemical fiber with lower melting point The suture is blown. Also, check if the hook hook line position is appropriate.
3. Other problems: Check whether the needle and needle plate are installed firmly. Check whether all the upper thread passes through the bend or the defect. Also check whether the bottom thread is too full or the winding is uneven. In addition, the operator's gestures are not good or the speed of the car is not rhythmic, which will pull the fabric and cut the polyester thread by the feed dog, or make the thread hook hook up and down to make the cross section line.
Solve the jumper problem of polyester thread
When the polyester thread is used on the sewing machine, the jumper problem sometimes occurs. The jumper is the polyester thread in the sewing process of the machine. Since the hook at the bottom of the machine tool cannot be hooked off the upper thread or the upper thread is taken off and slipped off, it cannot be continuously formed. A phenomenon of line steps. What kind of aspect do we have to check for this phenomenon?