Five-channel hollow-spindle fancy yarn forming device and method

The invention provides a five-channel hollow-spindle fancy yarn forming device and method. The yarn forming device comprises a first channel, a second channel, a third channel, a fourth channel and afifth channel; first component yarn, second component yarn, third component yarn, fourth component yarn and fifth component yarn are alternately twined and twisted at a first twisting point to form afancy yarn main body; a hollow spindle is arranged at a second twisting point, and the sixth component yarn on the hollow spindle and the fancy yarn main body intersect and the fancy yarn main body iscoated. Alternate drafting, alternate twining and twisting and coating processes are performed in one step, and one-step spinning of fancy yarn is achieved; besides, on-line change of colors and shapes of the fancy yarn such as slub yarn, big-belly yarn, knot yarn, loop yarn and pigtail yarn is achieved with technological means of adjusting and controlling the speed at which decorative yarn and core yarn are cooperatively