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Common faults and solutions of sewing machine

作者:点击:85 发布时间:2021-08-30

Common faults include jumper, broken wire, broken needle, sluggish feeding, no motor action, etc. fault phenomena and treatment methods:


1、 Jumper


There are two kinds of Jumper: 1. Jumper during sewing 2. Single line after sewing


1. Reasons for jumper during sewing: ① the gap between machine needle and hook needle is too large; ② the sewing bag is too thin; ③ the needle plate hole is worn; ④ the sewing bag is elastic; ⑤ there is no overpressure device for the sewing bag; ⑥ the groove surface of machine needle is not parallel to the face of machine body


Treatment: ① adjust the gap between machine needle and hook needle


② Replace sewing bag


③ Replace the needle plate


④ Seam changing envelope


⑤ Crimping device for sewing wrapped wire clamp


⑥ The needle groove surface of the alignment machine is parallel to the face of the machine body


2. Causes of single line after sewing: ① wear of needle plate ② excessive gap between presser foot and feeding tooth ③ excessive gap between machine needle and hook needle


Treatment: ① replace the needle plate


② Check whether the presser foot is worn and whether the feeding teeth are worn


③ Adjust the clearance between machine needle and hook needle


2、 Broken needle


There are two cases of needle breakage:


1. Needle installation reverse treatment: reinstall the needle


2. Treatment of too small gap between machine needle and hook needle: adjust the gap between machine needle and hook needle


3、 Disconnection


Identification of two phenomena: 1. The thread head is flush, indicating that it is cut. Possible causes: on the line, a part is sharp, such as hook needle, machine needle, panel, feeding tooth, etc.


Treatment: check the parts passed by the line. If sharp parts are found, polish them.


2. There are many burrs at the thread end, which indicates that it is broken. Possible causes: ① the quality of sewing and wrapping is too poor; ② the setting pressure of the thread presser is too high; ③ on the line, the thread is knotted somewhere


Treatment: ① replace the seam wrapping


② Reset the crimper pressure


③ Check the wiring