Functional adjustment of buttonhole sewing machines is a key step to ensure stable operation. When frequent thread breakage occurs, first check whether the needle and thread tension is too tight or too loose, and adjust the feed mechanism to optimize stitch smoothness.
Next, adjusting the needle bar height is critical. By loosening the fixing screws and making fine adjustments to the proper position, stitch skewing or skipped stitches can be effectively prevented. In addition, improper upper thread tension often causes uneven stitching, so the tension dial should be calibrated gradually.
If the shuttle casing experiences oil leakage, promptly cleaning the oil residue and replacing the sealing ring can quickly restore the machine’s sealing integrity. Mastering these techniques can significantly improve work efficiency.