1、YS‑4431‑LT Tubular Twin‑Needle Sewing Machine features synchronous feeding by needle, feed dog, and presser foot, preventing fabric slippage and ensuring neat, uniform stitches. It employs a slide‑bar thread take‑up and an imported vertical double‑size rotating hook to form two parallel rows of lock stitches. The upper and lower shafts are driven by synchronous toothed belts, while stitch length is adjusted via a knob‑type dial and feed direction is controlled by a lever‑type forward/reverse mechanism, making operation highly user‑friendly. In addition, a clutch‑type safety device is installed to protect the machine against overload‑induced damage

2、This model can be optionally equipped with an electronic positioning motor. During sewing pauses, the needle position can be set to consistently stop either above or below the fabric, eliminating the need for frequent handwheel adjustment and significantly improving operational convenience

This product is widely used in sewing applications such as tents, arch structures, parachutes, hot air balloons, seat cushions, and sofas. It is particularly suitable for filter bags and ring‑shaped cylindrical items