Dynamics of Thread Tension in the Knitting Process

Abstract

The change of thread tension in the compensating and knitting zone of knitting machine in some phases of loop formation is discussed. For the purposes of investigations presented in this paper, special sensors were constructed. Powers, exerting their influence in the semi-loop and loop of the plain weave in several phases of loop formation, as well as in several cycles, were determined. By means of direction and tension mechanisms, the change of the thread friction and stiffness of the thread in all its contact points was studied. The stiffness elasticity modulus as one of important parameters in this phase of investigation, was studied. Regarding the dynamism, the automatic regulation of the warp thread feeding was studied and the second degree differential eqation settled. The time constant obtained, resp. the period of one cycle of loops formation was compared with the period of one cycle obtained by means of experiments in the process of knitting.