【摘要】 <正> 前言由于环锭细纱机的断头大部分出现在前罗拉至导纱钩间的纺纱段,而断头是细纱张力与强力矛盾的表现,因此纺纱段张力的研究一直引起重视,甚至将纺纱张力作为衡量加捻卷绕正常与否的依据。更多还原

【Abstract】 In this paper, the dynamical Characteristics of yarn tension during ring spinning were investigated by means of the data analyser. Based on the data obtained, the characteristics of frequency and amplitude of dynamical yarn tension were derived through the high speed photography and other techniques.The paper proposes to use the effective value of yarn tension as its physical measurement. It incidues the statical component of its average value, and the dynamical component of its variances.Experiments show that dynamical yarn tension is a function of traveller revolution period. The simplest form of the function is a sine curve, which takes place at the nose of cop build during each ringrail movement. The complicated forms consist of four spectral values, i. e. fundamental, twice, triple, quadruple frequency traveller revolution. The dynamical component of yarn tension has no connection with the instantaneous changes of the friction between ring and traveller, but does depend on the change of contact between the yarn and thread guide.The amplitude of different spectral band of yarn tension can be obtained from the power spectrum. The maximum tension during each traveller revolution is T_o, which is the tension at the top of ballon, and at this instant, yarn slips off the thread guide as Fig. 4 shows.Finally, the paper points out that yarn tension has a close relation with the conditions of the thread guide.更多还原