automatic overlock machine

Applications of Lockstitch Seam

Conclusion

However, it is important to note that while double needles chain stitch sewing machines offer numerous benefits, they may not be suitable for every sewing task. For instance, in applications where a stronger, more secure seam is required, a lock-stitch machine may be more appropriate. Moreover, because chain stitches can unravel if not secured properly, additional techniques such as backstitching or using extra layers of fabric may be necessary in certain situations to prevent seam failure.

The lockstitch is formed by a combination of two threads the top thread, which is typically fed from the sewing machine’s needle, and the bobbin thread, which is located beneath the fabric. When the needle penetrates the fabric and completes its upward motion, the hook in the sewing machine catches the needle thread and loops it around the bobbin thread. This process tightly interlocks the two threads, forming a secure and balanced stitch.

3. Leather-Specific Thread Use polyester or nylon thread for sewing leather. These types of thread have the strength and flexibility necessary for heavy materials, unlike standard cotton thread, which may break under stress.