Figure 9 shows the point diagram of the tufting needle and loop hook movement mechanism of the designed LCL tufting machine. The solid line in the figure is the tufting needle actuator, and the dashed line is the loop hook actuator. Adjust the phase difference between the needle and the hook 105. , Carry out ADAMs simulation on the mechanism in Fig. 9, set the simulation speed to 400r/m, take the horizontal line of the looped hook tip as the needle displacement zero point, and the vertical position of the tufting needle as the hook displacement zero point simulation time 0.4S. Export the ADAMS simulation data to MATLAB E91 to get the motion law curve, as shown in Figure 10. It also reflects the timing relationship between the tufting needle and the loop-forming hook mechanism, that is, the phase difference 105. , The thick solid line is the motion path curve of the tufting needle actuator, and the thin solid line is the loop hook motion path curve.
In the process of tufting weaving movement, the tufting needle takes the yarn through the base fabric to make a reciprocating linear movement, and the loop-forming hook swings back and forth around the rocking shaft, and is synthesized by a certain regular relationship between the two. The cyclic action of yarn, hooking and de-yarn causes the pile yarn to form pile loops on the back of the base fabric. It can be seen from Figure 10 that the time of the needle on the carpet surface is 0.0496s, which accounts for 33% of the movement period (0.15s); it is beneficial to the hooking action. At point a, the hooking process passes through the vertical line of the tufting needle, and the hooking starts. At this time, the needle has not yet reached the bottom dead point, and the yarn is in a stretched state, which meets the technological requirements. It is assumed that the timing of the reed is known and the action of the reed is consistent with the hook. When the loop-forming hook moves back from the far dead center to the near dead center, the yarn is placed at the same time to form a pile loop. The loop-forming hook releases the yarn within a period of time after 6 o'clock, and the end of the yarn release is slightly behind the top dead center time of the tufting needle to ensure that the yarn maintains a certain tension and the yarn has a consistent amount of retraction, thereby forming A row of pile loops with a consistent height completes the loop pile process. Through analysis, the timing coordination of the tufting needle and loop-forming hook movement mechanism of the designed LCL tufting machine can meet the process requirements of loop-forming.
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