How to adjust the needle size of the overlock sewing machine

The size of the needle code (needle pitch) for overlock sewing machine adjustment mainly depends on the machine type, and is divided into two adjustment methods: mechanical and computerized. Before operation, it is necessary to ensure that the machine is in a stopped state.
Mechanical overlock sewing machine adjustment
Find the adjusting component: The needle distance adjustment knob or lever is usually located on the right side, front, or near the handwheel of the machine head. Some models require loosening the fixing screw first. ‌‌
Adjust the scale: Rotate the knob or move the lever to the target scale, the larger the number, the larger the needle spacing, and the smaller the number, the smaller the needle spacing.
Locking and fixing: After the adjustment is completed, tighten the fixing screws to prevent the needle pitch from changing during the sewing process.
Computerized overlock sewing machine adjustment
Enter setting mode: Turn on the power and enter the needle distance setting interface through the operation panel.
Button adjustment: Press the needle count button and use the plus or minus sign to set the desired number of needle codes. The display panel will show the current set value. ‌‌
Confirm and save: After setting, return to normal mode and try sewing to verify the stitch length.
Precautions
Distinguish between needle spacing and tension: Needle size refers to the length of the stitch, which is different from the tension of the suture thread (thread output), and should not be confused for adjustment. ‌‌
Trial sewing verification: After adjustment, first use waste cloth to test sewing, and use a ruler to measure whether the stitch length meets the standard.
Refer to the instruction manual: There are significant differences in the adjustment position between different brand models. It is recommended to refer to the user manual of the specific model. ‌