1、YS-4431D-ML Tubular Twin-Needle Sewing Machine features synchronous feeding by needle, feed dog, and presser foot to prevent fabric slippage and ensure neat, uniform stitches. It utilizes a slide-bar thread take-up mechanism 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-style dial and feed direction is controlled by a lever-type forward/reverse mechanism, making operation highly user‑friendly. Additionally, a clutch‑type safety device is installed to protect the machine from overload‑induced damage

2、This model can be optionally equipped with an electronic positioning motor, which allows the needle to be controlled to always stop either above or below the fabric during sewing pauses. This eliminates the need for frequent handwheel rotation when stopping the machine, making operation more convenient

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