The working principle of compound twisting machine and outer winding machine: The plied yarn drawn from the bobbin is output from the yarn guide roller through the yarn guide rod and the transverse yarn guide, and is wound on the bobbin through the yarn guide hook and the traveler. When the spindle drives the bobbin to rotate together, the yarn drives the traveler to rotate on the ring to twist the yarn.

Most of the bobbins on the creel are placed horizontally on the insertion spindle, and the plied yarn drives the bobbin to rotate and unwind from the side. The twist winding machine is fed by a single yarn bobbin. In order to reduce the breakage caused by excessive tension when the single yarn is unwinding, the tapered bobbin is tightly sleeved on the insertion spindle, and the single yarn is axially drawn out from the end of its own bobbin, so as to realize the integration in the feeding creel. . The double-twisting machine can save the drawing process, and is generally only suitable for spinning double-ply yarns with low quality requirements. The guide rollers are usually a pair of smooth round rollers. The lower roller is a section of 6 to 8 spindles, and the whole length is spliced. The upper roll is an ingot, which is pressurized by its own weight and driven by the friction of the lower roll. The plied yarn has a certain winding method on the roller, so that the yarn and the roller have a long enough friction envelope arc to ensure that the roller delivers the yarn to the twisting area at a uniform speed. Two bottom rollers, or even two pairs of rollers, are used to accommodate high twisting tensions and achieve uniform yarn feeding on special spun thick strands or multi-compound twisting machines. In the roller part, some compound twisting machines are equipped with automatic stop device for broken ends. Some compound twisting machines have a water tank under the yarn guide rod to water the twisted yarn before twisting, which is called a wet twisting machine. Wet twisted yarn has the advantages of high strength and smooth surface, but the roller and yarn guide parts need to use anti-rust material.

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