Upper and Lower Thread Breakage Switch for Nylon Zipper Sewing Machine
The Upper and Lower Thread Breakage Switch is a precision spare part designed for nylon zipper sewing machines. It detects thread breakage on the upper or lower thread during sewing operations and immediately stops the machine to prevent defective stitching. Manufactured from high-quality, durable materials, it provides reliable performance, long service life, and ensures consistent stitch quality in industrial zipper production.