Controlling Card Sliver Irregularity

概要

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This report describes how the irregularity of card slivers is removed on an automatically controlled drafting machine. It also fixes the most adequate condition for revolving irregularity. (1) The frequency-response fuction of this automatically controlled drafting mechanism is G(jω)= Ke-jωL / (jω / ωn)2+2ξ jω / ωn +1 |G(jω)|=K / [{1-(ω / ωn)2}2+(2ξ ω / ωn)2]1/2 ∠G(jω)=-Tan-1 2ξ ω / ωn / 1-(ω / ωn)2 -ωL, where ωn is undamped natural frequency, K a constant, ξ damping ratio and L delay time. (2) The controlling efficiency is expressed by |Gs(λ)|, i.e., |Gs(λ)|[1+ 1 / {1-(2πVm / ωnλ)2} + (2ξ 2πVm / ωnλ)2 - 2cos{φ-(Lx-L)} / √ {1-(2πVm / ωnλ)2} + (2ξ 2πVm / ωn)2] 1/2 φ=Tan-1 2ξ 2πVm / ωnλ / 1-(2πVm / ωnλ)2, where Vm is the mean speed of fed slivers, λ wave length of irregularity, and Lx transfer lag. In this equation, there is the most optimum value of Lx-L. (3) The most optimum roller gauge is given by R= S0 +S+ l / 2(1+CV2), where S0 is Lx · Vm, S distance from front roller to speed change point, l mean length of fibres, and CV coefficient of variation. (4) It is possible to control the short wave length irregularity to some extent.
社団法人日本繊維機械学会の論文