Abstract:

The basic research on carpet tufting technology is relativelly weak in China, and the guiding ideology and basic theory of tufting machine design were provided. The sequential relation of needle and looper in level-cut-loop (LCL) tufting machine was proposed according to the design method of phase circle and the technological requirements of general cut carpet tufting machine. The sequence chart of LCL carpet tufting machine was acquired by studying the loop-forming process under the circumstances in continuous loop pile, continuous cut pile and alternating loop and cut pile. It is showed that the latch should close upon the looper at the time which is slightly ahead the looper’s far stop time when a loop pile is tufted, and separate from the looper at leastbefore the looper’s far stop time when a cut pile is tufted. Owing to the motion of latch in the LCL carpet tufting machine is electrically controlled, and it is independent from the spindle drive movement system of needle, looper and knife, and the time sequence analysis and design provides the foundation for the machine design of loop-forming mechanism and the electrical design of control system.

Key words: level-cut-loop, carpet tufting machine, time sequence, loop-forming motion, looper's far stop time