METHOD AND DEVICE OF DYNAMICALLY CONFIGURING LINEAR DENSITY AND BLENDING RATIO OF YARN BY THREE -INGREDIENT ASYNCHRONOUS/SYNCHRONOUS DRAFTED

摘要

The invention discloses a method of dynamically configuring linear density and blending ratio of yarn by three-ingredient asynchronous/synchronous drafted, comprising: a drafting and twisting system, which includes a first stage drafting unit, a successive second stage drafting unit and an integrating and twisting unit. The first stage drafting unit includes a combination of back rollers and a middle roller. The second stage drafting unit includes a front roller and the middle roller. Blending proportion and linear densities of three ingredients are dynamically adjusted by the first stage asynchronous drafting mechanism, and reference linear density is adjusted by the second stage synchronous drafting mechanism. The invention can not only accurately control linear density change, but also accurately control a color change of the yarn. Further, the rotation rate of the middle roller is constant, ensuring a reproducibility of the patterns and colors of the yarn with a changing linear density.

主权项

1. A method of dynamically configuring a linear density and a blending ratio of a yarn by three-ingredient asynchronous/synchronous drafting, comprising:
providing an actuating mechanism, wherein the actuating mechanism includes a three-ingredient asynchronous/synchronous two-stage drafting mechanism, a twisting mechanism and a winding mechanism; wherein the three-ingredient asynchronous/synchronous two-stage drafting mechanism includes a first stage asynchronous drafting unit and a successive second stage synchronous drafting unit; providing a combination of a plurality of back roller and a middle roller included by the first stage asynchronous drafting unit; wherein the combination of back rollers has three rotational degrees of freedom and includes a first back roller, a second back roller, a third back roller, which are set abreast on a same back roller shaft; the first back roller, the second back roller, the third back roller move at the speeds Vh1, Vh2, and Vh3 respectively; the middle roller rotates at the speed Vz; the second stage synchronous drafting unit includes a front roller and the middle roller; the front roller rotates at the surface linear speed Vq; assuming the linear densities of a first roving yarn ingredient, a second roving yarn ingredient, a third roving yarn ingredient drafted by the first back roller, the second back roller, the third back roller are respectively ρ1, ρ2, and ρ3, the linear density of the yarn Y drafted and twisted by the front roller is ρy;
ρy=1/Va(Vh1*ρ1+Vh2*ρ2+Vh3*ρ3)  (1)the blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, and the third roving yarn ingredient are respectively k1, k2, and k3:k1=ρ1″ρ1″+ρ2″+ρ3″=ρ1′ρ1′+ρ2′+ρ3′=ρ1*Vh1ρ1*Vh1+ρ2*Vh2+ρ3*Vh3k2=ρ2″ρ1″+ρ2″+ρ3″=ρ2′ρ1′+ρ2′+ρ3′=ρ2*Vh2ρ1*Vh1+ρ2*Vh2+ρ3*Vh3k3=ρ3″ρ1″+ρ2″+ρ3″=ρ3′ρ1′+ρ2′+ρ3′=ρ3*Vh3ρ1*Vh1+ρ2*Vh2+ρ3*Vh3 keeping the ratio of linear speeds of the front roller and the middle roller Vq/Vz constant, the speeds of the front roller and the middle roller depend on reference linear density of the yarn; adjusting the rotation rates of the first back roller, the second back roller, the third back roller, so as to dynamically adjust the linear density of the yarn Y and the blending ratio on line.