Method and device of dynamically configuring linear density and blending ratio of yarn by four-ingredient asynchronous/synchronous drafted

Abstract

A device includes a drafting and twisting system. The drafting and twisting system 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 the four 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 a linear density change, but also accurately control color change of the yarn. Further, rotation rate of the middle roller is constant, ensuring a reproducibility of patterns and colors of the yarn with changing linear density.

Claims

1. A method of dynamically configuring a linear density and a blending ratio of a yarn by four-ingredient asynchronous drafting, comprising: 1) an actuating mechanism includes a four-ingredient asynchronous/synchronous two-stage drafting mechanism, a twisting mechanism and a winding mechanism; the four-ingredient asynchronous/synchronous two-stage drafting mechanism includes a first stage asynchronous drafting unit and a successive second stage synchronous drafting unit; 2) the first stage asynchronous drafting unit includes a combination of back rollers and a middle roller; the combination of back rollers has four rotational degrees of freedom and includes a first back roller, a second back roller, a third back roller, and a fourth back roller, which are set abreast on a same back roller shaft; the first back roller, the second back roller, the third back roller, and the fourth back roller move at speeds of V.sub.h1, V.sub.h2, V.sub.h3, and V.sub.h4 respectively; the middle roller rotates at a speed of V.sub.z; the second stage synchronous drafting unit includes a front roller and the middle roller; the front roller rotates at a surface linear speed of V.sub.q; assuming linear densities of a first roving yarn ingredient, a second roving yarn ingredient, a third roving yarn ingredient, and a fourth roving yarn ingredient drafted by the first back roller, the second back roller, the third back roller, and the fourth back roller are respectively .sub.1, .sub.2, .sub.3, and .sub.4, the linear density of the yarn Y drafted and twisted by the front roller is .sub.y; $\begin{matrix} _{y} = \frac{1}{V_{q}} (V_{h 1} *_{1} + V_{h 2} *_{2} + V_{h 3} *_{3} + V_{h 4} *_{4}) & (1) \end{matrix}$ blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, and the fourth roving yarn ingredient are respectively k.sub.1, k.sub.2, k.sub.3, and k.sub.4, $k_{1} = \frac{_{1}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{1}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{1} * V_{h 1}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3} ++_{4} * V_{h 4}}$ $k_{2} = \frac{_{2}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{2}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{2} * V_{h 2}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3} ++_{4} * V_{h 4}}$ $k_{3} = \frac{_{3}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{3}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{3} * V_{h 3}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3} ++_{4} * V_{h 4}}$ $k_{4} = \frac{_{4}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{4}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{1} * V_{h 1}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3} ++_{4} * V_{h 4}}$ 3) a ratio of linear speeds of the front roller and the middle roller V.sub.q/V.sub.z is kept constant, and speeds of the front roller and the middle roller depend on a reference linear density of the yarn; 4) the linear density or/and a blending ratio K of a yarn Y are dynamically adjusted online, by adjusting rotation rates of the first back roller, the second back roller, the third back roller, and the fourth back roller.

2. The method of claim 1, wherein according to a change of the blending ratio K of the yarn Y with a time t, and a change of the linear density .sub.y of the yarn Y with the time t, a change of surface linear speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller is derived; blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, and the fourth roving yarn ingredient are set respectively as k.sub.1, k.sub.2, k.sub.3, and k.sub.4, and ratios of blending ratios of the yarn Y are respectively K.sub.1, K.sub.2, and K.sub.3, $K_{1} = \frac{k_{1}}{k_{2}} = \frac{_{1} V_{h 1}}{_{2} V_{h 2}}$ $K_{2} = \frac{k_{1}}{k_{3}} = \frac{_{1} V_{h 1}}{_{3} V_{h 3}}$ $K_{3} = \frac{k_{1}}{k_{4}} = \frac{_{1} V_{h 1}}{_{4} V_{h 4}}$ the linear density of the yarn Y $_{y} = \frac{V_{h 1}^{*} +_{1} + V_{h 2}^{*} +_{2} + V_{h 3}^{*} +_{3} + V_{h 4}^{*} +_{4}}{V_{q}}$ then a surface linear speed of the first back roller is $V_{h 1} = \frac{_{y} V_{q}}{_{1} (1 + \frac{1}{K_{1}} + \frac{1}{K_{2}} + \frac{1}{K_{3}})}$ a surface linear speed of the second back roller is $V_{h 2} = \frac{_{y} V_{q}}{_{2} (1 + K_{1} + \frac{K_{1}}{K_{2}} + \frac{K_{2}}{K_{3}})}$ a surface linear speed of the third back roller is $V_{h 3} = \frac{_{y} V_{q}}{_{3} (1 + K_{2} + \frac{K_{2}}{K_{1}} + \frac{K_{2}}{K_{3}})}$ a surface linear speed of the fourth back roller is $V_{h 4} = \frac{_{y} V_{q}}{_{4} (1 + K_{3} + \frac{K_{3}}{K_{1}} + \frac{K_{3}}{K_{2}})}$ wherein .sub.1, .sub.2, .sub.3, and .sub.4 are constants, and K.sub.i and .sub.y are functions changing with the time t.

3. The method of claim 1, wherein assuming .sub.1=.sub.2=.sub.3=.sub.4=, then: 1) a speed of any one of the first back roller, the second back roller, the third back roller and the fourth back roller is changed, and speeds of the other three back rollers are kept unchanged, and then a yarn ingredient drafted by the any one of back rollers and a linear density thereof change, and the linear density p.sub.y of the yarn Y is adjusted as: $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + V_{h 4})$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + V_{h 3})$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + V_{h 2})$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + V_{h 1})$ wherein .sub.y is a linear density change of the yarn, V.sub.h1, V.sub.h2, V.sub.h3 and V.sub.h4 is a speed change of the first, second, third and fourth back roller respectively; 2) speeds of any two back rollers of the first back roller, the second back roller, the third back roller, and the fourth back roller are changed, and speeds of the other two back rollers are kept unchanged, two yarn ingredients drafted by the any two back rollers and linear densities thereof change, and the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 2})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 4})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 2} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 2} + V_{h 4})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 3} + V_{h 4})]$ 3) speeds of any three back rollers of the first back roller, the second back roller, the third back roller and the fourth back roller are changed, and speeds of the other back rollers are kept unchanged, three yarn ingredients drafted by the any three back rollers and the linear densities thereof change, and the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 2} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 4} + V_{h 2} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 4} + V_{h 1} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 4} + V_{h 2} + V_{h 1})] .$ 4) speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller are changed simultaneously, and a sum of speeds of four back rollers is unequal to zero, yarn ingredients drafted by the four back rollers and linear densities thereof change, and the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4})] .$

4. The method of claim 3, wherein speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller are changed, and a speed of any one of back rollers is equal to zero, while speeds of other three back rollers are unequal to zero, a yarn ingredient drafted by the any one of back rollers is discontinuous, while other three yarn ingredients are continuous, and the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3})] (T_{1} t T_{2})$ $or$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 4} + V_{h 4}) + (V_{h 3} + V_{h 3})] (T_{1} t T_{2})$ $or$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h 4} + V_{h 4}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3})] (T_{1} t T_{2})$ $or$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 4} + V_{h 4})] (T_{1} t T_{2})$ wherein T.sub.1, and T.sub.2 are time points, and t is a time variable.

5. The method of claim 3, wherein speeds of the first back roller, the second back roller, the third back roller, the fourth back roller, and speeds of any two back rollers are equal to zero, while speeds of other two back rollers are unequal to zero, and the yarn ingredients drafted by the any two back rollers are discontinuous, while other two yarn ingredients are continuous, and the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j})] (T_{1} t T_{2})$ wherein T.sub.1, and T.sub.2 are time points, t is a time variable, ij and i,j(1,2,3,4).

6. The method of claim 3, wherein speeds of the first back roller, the second back roller, the third back roller and the fourth back roller are changed, and speeds of any three back rollers are equal to zero, while speeds of other one back roller is unequal to zero, three yarn ingredients drafted by the any three back rollers are discontinuous, while the other yarn ingredients are continuous, and the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h j} + V_{h j})] (T_{1} t T_{2})$ wherein T.sub.1, and T.sub.2 are time points, t is a time variable, and j(1,2,3,4).

7. The method of claim 3, wherein the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller are changed, and speeds of any two back rollers are equal to zero successively, while speeds of other back rollers are unequal to zero, and yarn ingredients drafted by the any two back rollers are discontinuous successively, while other yarn ingredients are continuous, and the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j}) + (V_{h k} + V_{h k})] (T_{1} t T_{2})_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j})] (T_{2} t T_{3})$ wherein T.sub.1, T.sub.2 and T.sub.3 are time points, t is a time variable, ijk and i,j,k(1,2,3,4).

8. The method of claim 3, wherein the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller are changed, and speeds of any three back rollers are equal to zero successively, while speeds of the other back rollers are unequal to zero, and yarn ingredients drafted by the any three back rollers are discontinuous successively, while other yarn ingredients are continuous, and the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j}) + (V_{h k} + V_{h k})] (T_{1} t T_{2})_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j})] (T_{2} t T_{3})_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i})] (T_{3} t T_{4})$ wherein T.sub.1, T.sub.2 T.sub.3 and T.sub.4 are time points, and t is a time variable, ijk and i,j,k(1,2,3,4).

9. The method of claim 3, wherein the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller are changed, and V.sub.h1*.sub.1+V.sub.h2*.sub.2+V.sub.h3*.sub.3+V.sub.h4*.sub.4 are a constant, and .sub.1=.sub.2=.sub.3=.sub.4= then the linear density of the yarn Y is unchanged while the blending ratios of the ingredients change; the blending ratios k.sub.1, k.sub.2, k.sub.3, k.sub.4 of the first yarn ingredient, the second yarn ingredient, the third yarn ingredient, and the fourth yarn ingredient are provided as below: $k_{j} = \frac{V_{hj} + V_{hj}}{V_{h 1} + V_{h 1} + V_{h 2} + V_{h 2} + V_{h 3} + V_{h 3} + V_{h 4} + V_{h 4}}$ wherein j(1,2,3,4).

10. The method of claim 1, wherein according to the set blending ratio and/or linear density, the yarn Y is divided into n segments; then a linear density and a blending ratio of each segment of yarn Y are the same, while linear densities and blending ratios of adjacent segments are different; when drafting the segment i of the yarn Y, linear speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller are V.sub.h1i, V.sub.h2i, V.sub.h3i, V.sub.h4i, wherein i(1, 2, . . . , n); the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, and the fourth roving yarn ingredient are two-stage drafted and twisted to form segment i of yarn Y, and blending ratios k.sub.1i, k.sub.2i, k.sub.3i, and k.sub.4i thereof are: $\begin{matrix} k_{1 i} = \frac{_{1} * V_{h 1 i}}{p_{1} * V_{h 1 i} + p_{2} * V_{h 2 i} + p_{3} * V_{h 3 i} + p_{4} * V_{h 4 i}} & (2) \\ k_{2 i} = \frac{_{2} * V_{h 2 i}}{p_{1} * V_{h 1 i} + p_{2} * V_{h 2 i} + p_{3} * V_{h 3 i} + p_{4} * V_{h 4 i}} & (3) \\ k_{3 i} = \frac{_{3} * V_{h 3 i}}{p_{1} * V_{h 1 i} + p_{2} * V_{h 2 i} + p_{3} * V_{h 3 i} + p_{4} * V_{h 4 i}} & (4) \\ k_{4 i} = \frac{_{4} * V_{h 4 i}}{p_{1} * V_{h 1 i} + p_{2} * V_{h 2 i} + p_{3} * V_{h 3 i} + p_{4} * V_{h 4 i}} & (5) \end{matrix}$ the linear density of the segment i of the yarn Y is: $\begin{matrix} _{y 1} = \frac{V_{z}}{V_{q}} * (\frac{V_{h 1 i}}{V_{z}} *_{1} + \frac{V_{h 2 i}}{V_{z}}_{2} + \frac{V_{h 3 i}}{V_{z}}_{3} + \frac{V_{h 4 i}}{V_{z}}_{4}) = \frac{1}{e_{q}} * (\frac{V_{h 1 i}}{V_{z}} *_{1} + \frac{V_{h 2 i}}{V_{z}}_{2} + \frac{V_{h 3 i}}{V_{z}}_{3} + \frac{V_{h 4 i}}{V_{z}}_{4}) & (6) \end{matrix}$ wherein $e_{q} = \frac{V_{q}}{V_{z}}$ is a two-stage drafting ratio; (1) a segment with the lowest density is taken as a reference segment, whose reference linear density is .sub.0; reference linear speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller for the reference segment are respectively V.sub.h10, V.sub.h20, V.sub.h30, and V.sub.h40; and reference blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, and the fourth roving yarn ingredient for the reference segment are respectively k.sub.10, k.sub.20, k.sub.30, and k.sub.40, a linear speed of the middle roller is kept constant, and
V.sub.Z=V.sub.h10+V.sub.h20+V.sub.h30+V.sub.h40(7); and the two-stage drafting ratio $e_{q} = \frac{V_{q}}{V_{z}}$ is kept constant; wherein reference linear speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller for the reference segment are respectively V.sub.h10, V.sub.h20, V.sub.h30, and V.sub.h40, which are predetermined according to a material, a reference linear density .sub.0 and a reference blending ratios k.sub.10, k.sub.20, k.sub.30 and k.sub.40 of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, and the fourth roving yarn ingredient; (2) when the segment i of the yarn Y is drafted and blended, on a premise of known set linear density .sub.yi and blending ratios k.sub.1i, k.sub.2i, k.sub.3i, and k.sub.4i, linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i and V.sub.h4i of the first back roller, the second back roller, the third back roller, and the fourth back roller are calculated according to equations (2)-(7); (3) based on reference linear speeds V.sub.h10, V.sub.h20, V.sub.h30, and V.sub.h40 for the reference segment, rotation rates of the first back roller, the second back roller, the third back roller, or/and the fourth back roller are increased/decreased to dynamically adjust the linear density or/and the blending ratio for the segment i of the yarn Y.

11. The method of claim 10, wherein .sub.1=.sub.2=.sub.3=.sub.4=, equation (6) is simplified as $\begin{matrix} _{y i} = \frac{}{e_{q}} * \frac{V_{h 11} + V_{h 21} + V_{h 31} + V_{h 41}}{V_{z}} & (8) \end{matrix}$ according to equations (2)-(5) and (7)-(8), linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i, V.sub.h4i of the first back roller, the second back roller, the third back roller and the fourth back roller are calculated; based on reference linear speeds V.sub.h10, V.sub.h20, V.sub.h30, V.sub.h40, rotation rates of the first back roller, the second back roller, the third back roller, or/and the fourth back roller are increased or decreased to reach a preset linear density and blending ratio for the segment i of the yarn Y.

12. The method of claim 10, wherein at a moment of switching segment i1 to segment i of the yarn Y, the linear density of the yarn Y is increased by dynamic increment .sub.yi, i.e., linear density change .sub.yi, on a basis of the reference linear density; and the first back roller, the second back roller, the third back roller and the fourth back roller have corresponding increments on a basis of the reference linear speed, when (V.sub.h10+V.sub.h20+V.sub.h30+V.sub.h40).fwdarw.(V.sub.h10+.sub.h1i+V.sub.h20+V.sub.h2i+V.sub.h30+V.sub.h3i+V.sub.h40+V.sub.h4i) a linear density increment of the yarn Y is: $_{yi} = \frac{}{e_{q} V_{z}} * (V_{h 1 i} + V_{h 2 i} + V_{h 3 i} + V_{h 4 i}) :$ the linear density .sub.yi of the yarn Y is $\begin{matrix} _{yi} =_{y 0} +_{yi} =_{y 0} + \frac{V_{h 1 i} + V_{h 2 i} + V_{h 3 i} + V_{h 4 i}}{V_{z}} * \frac{}{e_{q}} & (9) \end{matrix}$ let V.sub.i=V.sub.h1i+V.sub.h2i+V.sub.h3i+V.sub.h4i, then equation (9) is simplified as: $\begin{matrix} _{yi} =_{y 0} + \frac{V_{i}}{V_{z}} * \frac{}{e_{q}} & (10) \end{matrix}$ the linear density of the yarn Y is adjusted by controlling a sum of linear speed increments V.sub.i of the first back roller, the second back roller, the third back roller, and the fourth back roller.

13. The method of claim 12, wherein .sub.1=.sub.2=.sub.3=.sub.4=, at a moment of switching the segment i1 to the segment i of the yarn Y, blending ratios of the yarn Y in equations (2)-(5) are simplified as: $\begin{matrix} k_{1 i} = \frac{V_{h 10} + V_{h 1 i}}{V_{z} + V_{i}} & (11) \\ k_{2 i} = \frac{V_{h 20} + V_{h 2 i}}{V_{z} + V_{i}} & (12) \\ k_{3 i} = \frac{V_{h 30} + V_{h 3 i}}{V_{z} + V_{i}} & (13) \\ k_{4 i} = \frac{V_{h 40} + V_{h 4 i}}{V_{z} + V_{i}} & (14) \end{matrix}$ blending ratios of the yarn Y are adjusted by controlling linear speed increments of the first back roller, the second back roller, the third back roller, the fourth back roller; wherein
V.sub.h1i=k.sub.1i*(V.sub.Z+V.sub.i)V.sub.h10
V.sub.h2i=k.sub.2i*(V.sub.Z+V.sub.i)V.sub.h20
V.sub.h3i=k.sub.3i*(V.sub.Z+V.sub.i)V.sub.h30
V.sub.h4i=k.sub.4i*(V.sub.Z+V.sub.i)V.sub.h40.

14. The method of claim 12, wherein
V.sub.h1i*.sub.1+V.sub.h2i*.sub.2+V.sub.h3i*.sub.3+V.sub.h4i*.sub.4=H, H is a constant, and V.sub.i is constantly equal to zero, the linear density is unchanged when the blending ratios of the yarn Y are adjusted.

15. The method of claim 12, wherein any one to three of V.sub.h1i, V.sub.h2i, V.sub.h3i, and V.sub.h4i are equal to zero, while the remaining ones are not zero, and one to three roving yarn ingredients are changed while the other rovings ingredients are unchanged, and the adjusted blending ratios are: $k_{ki} = \frac{V_{hk 0} + V_{hki}}{V_{z} + V_{i}}$ $k_{ji} = \frac{V_{hj 0}}{V_{z} + V_{i}}$ wherein k, j(1,2,3,4) and kj.

16. The method of claim 12, wherein none of V.sub.h1i, V.sub.h2i, V.sub.h3i, and V.sub.h4i are equal to zero, and the four roving yarn ingredients in the yarn Y change.

17. The method of claim 12, wherein any one to three of V.sub.h1i, V.sub.h2i, V.sub.h3i, and V.sub.h4i is equal to zero, while the remaining ones are not zero, then the one to three roving yarn ingredients of the segment i of the yarn Y are discontinuous.

18. The method of claim 1, wherein yellow roving yarns, magenta roving yarns, cyan roving yarns, and black yarns are respectively drafted by the first back roller, the second back roller, the third back roller, and the fourth back roller; a speed V.sub.q of the front roller is kept constant and speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller are adjusted to regulate colors of the yarns; when blending colors, a concentration or brightness and a hue is adjusted with a proportion of black color.

19. A device for implementing a method of dynamically configuring a linear density and a blending ratio of a yarn by four-ingredient asynchronous drafting and dynamically configuring a linear density and a blending ratio of a yarn by four-ingredient asynchronous/synchronous drafting, comprising: a control system, and an actuating mechanism, wherein the actuating mechanism includes a four-ingredient separate/integrated asynchronous/synchronous two-stage drafting mechanism, a twisting mechanism and a winding mechanism; the two-stage drafting mechanism includes a first stage drafting unit and a second stage drafting unit; the first stage drafting unit includes a combination of back rollers and a middle roller; the combination of back rollers has four rotational degrees of freedom and includes a first back roller, a second back roller, a third back roller, and a fourth back roller, which are set abreast on a same back roller shaft; four back rollers are adjacently provided in sequence and driving pulleys thereof are located on both sides of the four back rollers; the second stage drafting unit includes a front roller and a middle roller.

20. The device of claim 19, wherein any one of the four back roller is fixedly set on the back roller shaft; other three back rollers are respectively symmetrically set on the back roller shaft and independently rotatable with each other.

21. The device of claim 20, wherein the third back roller is fixed on the back roller shaft and the other three back rollers are respectively symmetrically set on the back roller shaft and independently rotatable with each other; the second back roller has a second sleeve connected to a driving mechanism of the second back roller, and the second sleeve is sleeved around the back roller shaft, and the first back roller is rotatably sleeved around the second sleeve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a principle schematic diagram of the two-stage drafting spinning device;

(2) FIG. 2 is a structural schematic diagram of a combination of back rollers;

(3) FIG. 3 is a structural side view of the two-stage drafting spinning device;

(4) FIG. 4 is a yarn route of the two-stage drafting in an embodiment;

(5) FIG. 5 is a structural schematic diagram of a control system.

DETAILED DESCRIPTION OF THE INVENTION

(6) The embodiments of the invention are described as below, in combination with the accompanying drawings.

Embodiment 1

(7) A method and device of configuring linear density and blending ratio of yarn by four-ingredient asynchronous/synchronous drafted is disclosed, comprising:

(8) 1) as shown in FIGS. 1-5, a drafting and twisting system includes a first stage drafting unit and a successive second stage drafting unit;

(9) 2) the first stage drafting unit includes a combination of back rollers and a middle roller 3; the combination of back rollers has four rotational degrees of freedom and includes a first back roller 6, a second back roller 8, a third back roller 10, a fourth back roller 12, which are set abreast on a same back roller shaft; the second stage drafting unit includes a front roller land the middle roller 3.

(10) 4 is the top roller of middle roller 3, 5, 7, 9, 11 are the top rollers of four back rollers respectively. 2 is the top roller of front roller 1. O.sub.1,O.sub.1, O.sub.2,O.sub.2, O.sub.3,O.sub.3 respectively refer to axis lines of back rollers, the middle roller and the front roller. The first stage drafting is implemented by the middle roller and the back rollers and the second drafting is implemented by the front roller and the middle roller. 15 is the winding device and 14 is guider roller. 16 is the yarn Y.

(11) FIG. 2 shows a four-nested combination of back rollers with four rotational degrees of freedom. The four movable back rollers 6,8,10,12 are respectively driven by a core shaft and pulleys 20, 24, 30 and 32. The first back roller, the second back roller, the third back roller and the fourth back roller move at the speeds V.sub.h1, V.sub.h2, V.sub.h3, and V.sub.h4 respectively; the middle roller rotates at the speed V.sub.z; the front roller rotates at the surface linear speed V.sub.q. Assuming the linear densities of a first roving yarn ingredient, a second roving yarn ingredient, a third roving yarn ingredient, a fourth roving yarn ingredient drafted by the first back roller, the second back roller, the third back roller and the fourth back roller are respectively .sub.1, .sub.2, .sub.3, and .sub.4, the linear density of the yarn Y drafted and twisted by the front roller is .sub.y.

(12) The four coaxial back rollers with the same diameters correspond with four coaxial top rollers with the same diameters. The roving yarns are held by the four pairs of parallel arranged upper aprons and corresponding lower aprons located in the back area. When spinning, the four roving yarns are located by a guide rod and a bell mouth in the process of drafting and twisting, to travel according to the route showed in FIG. 4. The four roving yarns .sub.1, .sub.2, .sub.3, .sub.4 are fed into the first stage drafting area via the jaws a.sub.1, a.sub.2, a.sub.3, a.sub.4 of the back rollers at different speeds, and travel in parallel to the holding points b.sub.1, b.sub.2, b.sub.3, b.sub.4 and output at the speed V.sub.z. The linear densities of the four strands are respectively .sub.1, .sub.2, .sub.3, .sub.4. Then the four strands enter into the second stage drafting area and integrate at the jaw c of the front roller. The linear densities of the four strands are changed to .sub.1, .sub.2, .sub.3, .sub.4 after synchronously drafted by the front roller at the surface speed V.sub.q. The four strands are integrated at the jaw c of the front roller and then twisted together to form the yarn Y

(13) $\begin{matrix} _{y} = \frac{1}{V_{q}} (V_{h 1} *_{1} + V_{h 2} *_{2} + V_{h 3} *_{3} + V_{h 4} *_{4}) & (1) \end{matrix}$

(14) 3) The second stage drafting unit includes the front roller and the middle roller; the front roller moves at the speed V.sub.q;

(15) 4) The speed V.sub.q of the front roller and the speed V.sub.z of the middle roller are kept constant, and only the speeds of first back roller, the second back roller, the third back roller and the fourth back roller are adjusted, and the linear density or/and the blending ratio of the yarn can be adjusted.

(16) The Specific Adjusting Method for the Linear Density:

(17) Assuming the linear densities of a first roving yarn ingredient, a second roving yarn ingredient, a third roving yarn ingredient, a fourth roving yarn ingredient drafted by the first back roller, the second back roller, the third back roller and the fourth back roller are respectively .sub.1, .sub.2, .sub.3, and .sub.4, the linear density of the yarn Y drafted and twisted by the front roller is .sub.y.

(18) $_{y} = \frac{1}{V_{q}} (V_{h 1} *_{1} + V_{h 2} *_{2} + V_{h 3} *_{3} + V_{h 4} *_{4})$

(19) 1) change the speed of any of the first back roller, the second back roller, the third back roller, the fourth back roller, and keep the speeds of the other three backer rollers unchanged, and then the yarn ingredient of the yarn Y drafted by this back roller and the linear density thereof change accordingly. The linear density .sub.y of the yarn Y is adjusted as:

(20) $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + V_{h 4})$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + V_{h 3})$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + V_{h 2})$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + V_{h 1})$

(21) wherein .sub.y is a linear density change of the yarn, V.sub.h1, V.sub.h2, V.sub.h3 and V.sub.h4 is a speed change of the first back roller, second, third and fourth respectively.

(22) 2) change the speeds of any two back rollers of the first back roller, the second back roller, the third back roller, the fourth back roller, and keep the speeds of the other two backer rollers unchanged, the yarn ingredients of the yarn Y drafted by these any two back rollers and the linear densities thereof change accordingly. The linear density .sub.y of the yarn Y is adjusted as:

(23) $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 2})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 4})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 2} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 2} + V_{h 4})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 3} + V_{h 4})]$

(24) 3) change the speeds of any three back rollers of the first back roller, the second back roller, the third back roller, the fourth back roller simultaneously, and keep the speeds of the other one backer rollers unchanged, the yarn ingredients of the yarn Y drafted by these any three back rollers and the linear densities thereof change accordingly. The linear density .sub.y of yarn Y is adjusted as:

(25) $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 2} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 4} + V_{h 2} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 4} + V_{h 1} + V_{h 3})]$ $or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 4} + V_{h 2} + V_{h 1})]$

(26) 4) change the speeds of the first back roller, the second back roller, the third back roller and the fourth back roller simultaneously, and the sum of the speeds of the four back rollers is unequal to zero. The yarn ingredients of the yarn Y drafted by these four back rollers and the linear densities thereof change accordingly. The linear density .sub.y of the yarn Y is adjusted as:

(27) $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4} + (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4})]$

(28) 5) change the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller, and make the speed of any of back rollers equal to zero, while the speeds of the other three backer rollers unequal to zero. The yarn ingredient of the yarn Y drafted by the any one of back rollers is thus discontinuous, while the other four yarn ingredients are continuous. The linear density .sub.y of the yarn Y is adjusted as:

(29) $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $\begin{matrix} _{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3})] (T_{1} t T_{2}) \end{matrix}$ $or$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 4} + V_{h 4}) + (V_{h 3} + V_{h 3})] (T_{1} t T_{2}) or_{y}^{} = \frac{}{V_{q}} * [(V_{h 4} + V_{h 4}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3})] (T_{1} t T_{2}) or$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 4} + V_{h 4})] (T_{1} t T_{2})$

(30) wherein T.sub.1, and T.sub.2 are time points, and t is a time variable.

(31) 6) change the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller, and make the speeds of any two back rollers equal to zero, while the speeds of the other two backer rollers unequal to zero. The yarn ingredients of the yarn Y drafted by the any two back rollers are thus discontinuous, while the other two yarn ingredients are continuous. The linear density .sub.y of the yarn Y is adjusted as:

(32) $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j})] (T_{1} t T_{2})$

(33) wherein T.sub.1, and T.sub.2 are time points, and t is a time variable; ij and i,j(1,2,3,4).

(34) 7) change the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller, and make the speeds of any three back rollers equal to zero, while the speeds of the other one backer rollers unequal to zero. The yarn ingredients of the yarn Y drafted by the any three back rollers are thus discontinuous, while the other one yarn ingredients are continuous. The linear density .sub.y of the yarn Y is adjusted as:

(35) 0 $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h j} + V_{h j})] (T_{1} t T_{2})$

(36) wherein T.sub.1, and T.sub.2 are time points, and t is a time variable; j(1,2,3,4).

(37) 8) change the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller, and make the speeds of any two back rollers equal to zero successively, while the speeds of the other two backer rollers unequal to zero. The yarn ingredients of the yarn Y drafted by the any two back rollers are thus discontinuous successively, while the other two yarn ingredients are continuous. The linear density .sub.y of the yarn Y is adjusted as:

(38) $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j}) + (V_{h k} + V_{h k})] (T_{1} t T_{2})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j})] (T_{2} t T_{3})$

(39) wherein T.sub.1, T.sub.2 and T.sub.3 are time points, and t is a time variable; ijk and i,j,k(1,2,3,4).

(40) 9) change the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller, and make the speeds of any three back rollers equal to zero successively, while the speeds of the other one backer rollers unequal to zero. The yarn ingredients of the yarn Y drafted by the any three back rollers are thus discontinuous successively, while the other yarns ingredients are continuous. The linear density .sub.y of yarn Y is adjusted as:

(41) $_{y}^{} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3}) + (V_{h 4} + V_{h 4})] (0 t T_{1})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j}) + (V_{h k} + V_{h k})] (T_{1} t T_{2})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i}) + (V_{h j} + V_{h j})] (T_{2} t T_{3})$ $_{y}^{} = \frac{}{V_{q}} * [(V_{h i} + V_{h i})] (T_{3} t T_{4})$

(42) wherein T.sub.1, T.sub.2, T.sub.3 and T.sub.4 are time points, and t is a time variable; ijk and i,j,k(1,2,3,4).

(43) The specific adjusting method for blending ratio:

(44) change the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller, and keep
V.sub.h1*.sub.1+V.sub.h2*.sub.2+V.sub.h3*.sub.3+V.sub.h4*.sub.4=constant

(45) assuming .sub.1=.sub.2=.sub.3=.sub.4= then linear density of the yarn Y is thus fixed while the blending ratios of the ingredients thereof change; the blending ratios k.sub.1, k.sub.2, k.sub.3 and k.sub.4 of the first yarn ingredient, the second yarn ingredient, the third yarn ingredient, and the fourth yarn ingredient are provided as below:

(46) $k_{j} = \frac{V_{hj} + V_{hj}}{V_{h 1} + V_{h 1} + V_{h 2} + V_{h 2} + V_{h 3} + V_{h 3} + V_{h 4} + V_{h 4}}$

(47) wherein j(1,2,3,4)

(48) let .sub.1=.sub.2=.sub.3=.sub.4= and adjust the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller by V.sub.h1+V.sub.h2+V.sub.h3+V.sub.h4=V.sub.Z, i.e., the sum of the linear speeds of the four back rollers is equal to the linear speed of the middle roller, then:

(49) $k_{1} = \frac{V_{h 1}}{V_{z}} = \frac{1}{e_{h 1}}$ $k_{2} = \frac{V_{h 2}}{V_{z}} = \frac{1}{e_{h 2}}$ $k_{3} = \frac{V_{h 3}}{V_{z}} = \frac{1}{e_{h 3}}$ $k_{4} = \frac{V_{h 4}}{V_{z}} = \frac{1}{e_{h 4}}$

(50) i.e., the blending ratios of the four yarn ingredients 1, .sub.2, .sub.3, .sub.4 of the yarn Y are equal to the inverses of their drafting ratios in the first stage drafting area

(51) $e_{h 1} = \frac{V_{z}}{V_{h 1}} = \frac{1}{k_{1}}$ $e_{h 2} = \frac{V_{z}}{V_{h 2}} = \frac{1}{k_{2}}$ $e_{h 3} = \frac{V_{z}}{V_{h 3}} = \frac{1}{k_{3}}$ $e_{h 4} = \frac{V_{z}}{V_{h 4}} = \frac{1}{k_{4}}$

(52) Wherein there is an integrator between the combination of back rollers and the middle roller, the speed of the middle roller is kept unchanged, and then the first stage drafting unit functions as a blended or color-mixing unit, and the second stage drafting unit functions as a pure liner density regulating unit.

(53) By controlling the operating speed of the middle roller, without regard for the later linear density adjusting process, the yarn can be blended more even and thorough, preventing the influences on the blending process from the linear density adjusting process. Further, the yarn can be ensured to be blended more evenly by controlling the speed of the middle roller under V.sub.h1+V.sub.h2+V.sub.h3+V.sub.h4.

Embodiment 2

(54) The method of this embodiment is substantially the same as Embodiment 1, and the differences are:

(55) The yellow, magenta, cyan, and black yarns are respectively drafted by the first back roller, the second back roller, the third back roller, and the fourth back roller; the speed V.sub.q of the front roller is kept constant and the speeds of the first back roller, the second back roller, the third back roller, and the fourth back roller are adjusted to regulate the colors of the yarns; when blending the colors, the color depth or the saturation of the colored spun yarn is adjusted by the black yarn.

(56) Linear density of yellow, magenta, cyan, and black yarns are .sub.1, .sub.2, .sub.3 and .sub.4 respectively. Let
V.sub.h1*.sub.1+V.sub.h2*.sub.2+V.sub.h3*.sub.3+V.sub.h4*.sub.4=constant

(57) or

(58) $\frac{_{1}}{E_{1}} + \frac{_{2}}{E_{2}} + \frac{_{3}}{E_{3}} + \frac{_{4}}{E_{4}} = constant$

(59) then the linear density of blended yarn can be unchanged.

(60) Wherein E.sub.i=V.sub.q/V.sub.hi is the drafting ratio of front roller to the i back roller, i=1, 2, 3.

(61) In this invention, blending ratios of yellow, magenta, cyan, and black yarns are respectively adjusted by changing the speed of first back roller, the second back roller, the third back roller and the fourth back roller respectively. Blending ratios of the four basic color are as followings:

(62) $K_{1} = \frac{_{1}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{1} / E_{1}}{_{1} / E_{1} +_{2} / E_{2} +_{3} / E_{3} +_{4} / E_{4}} = \frac{V_{h 1}_{1}}{V_{h 1}_{1} + V_{h 2}_{2} + V_{h 3}_{3} + V_{h 4}_{4}}$ $K_{2} = \frac{_{2}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{1} / E_{2}}{_{1} / E_{1} +_{2} / E_{2} +_{3} / E_{3} +_{4} / E_{4}} = \frac{V_{h 1}_{1}}{V_{h 1}_{1} + V_{h 2}_{2} + V_{h 3}_{3} + V_{h 4}_{4}}$ $K_{3} = \frac{_{3}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{3} / E_{3}}{_{1} / E_{1} +_{2} / E_{2} +_{3} / E_{3} +_{4} / E_{4}} = \frac{V_{h 1}_{3}}{V_{h 1}_{1} + V_{h 2}_{2} + V_{h 3}_{3} + V_{h 4}_{4}}$ $K_{4} = \frac{_{4}^{}}{_{1}^{} +_{2}^{} +_{3}^{} +_{4}^{}} = \frac{_{4} / E_{4}}{_{1} / E_{1} +_{2} / E_{2} +_{3} / E_{3} +_{4} / E_{4}} = \frac{V_{h 4}_{4}}{V_{h 1}_{1} + V_{h 2}_{2} + V_{h 3}_{3} + V_{h 4}_{4}}$
Let .sub.1=.sub.2=.sub.3=.sub.4, the sum of linear speeds of the first back roller, the second back roller, the third back roller and the fourth back roller are unchanged, thus V.sub.h1+V.sub.h2+V.sub.h3+V.sub.h4=constant, blending ratios of different base colors in the yarn can be adjusted by changing V.sub.h1, V.sub.h2, V.sub.h3, V.sub.h4. For example, the blending ratios are calculated as followings:

(63) $K_{1} = \frac{V_{h 1}}{V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4}}$ $K_{2} = \frac{V_{h 2}}{V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4}}$ $K_{3} = \frac{V_{h 3}}{V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4}}$ $K_{4} = \frac{V_{h 4}}{V_{h 1} + V_{h 2} + V_{h 3} + V_{h 4}}$

(64) Therefore the process of calculations of the blending ratio is simplified and the efficiency are improved, also the mixed color are more accurate.

Embodiment 3

(65) The method of this embodiment is substantially the same as Embodiment 1, and the differences are:

(66) 1) According to the set blending ratio and/or linear density, divide the yarn Y into n segments. The linear density and blending ratio of each segment of yarn Y are the same, while the linear densities and blending ratios of the adjacent segments are different; when drafting the segment i of the yarn Y, the linear speeds of the first back roller, the second back roller, the third back roller and the fourth back roller are V.sub.h1i, V.sub.h2i, V.sub.h3i, V.sub.h4i, wherein i(1, 2, . . . , n); the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, the fourth roving yarn ingredient are two-stage drafted and twisted to form segment i of yarn Y, and the blending ratios k.sub.1i, k.sub.2i, k.sub.3i and k.sub.4i thereof are expressed as below:

(67) $\begin{matrix} k_{1 i} = \frac{_{1} * V_{h 1 i}}{_{1} * V_{h 1 i} +_{2} * V_{h 2 i} +_{3} * V_{h 3 i} +_{4} * V_{h 4 i}} & (2) \\ k_{2 i} = \frac{_{2} * V_{h 2 i}}{_{1} * V_{h 1 i} +_{2} * V_{h 2 i} +_{3} * V_{h 3 i} +_{4} * V_{h 4 i}} & (3) \\ k_{3 i} = \frac{_{3} * V_{h 3 i}}{_{1} * V_{h 1 i} +_{2} * V_{h 2 i} +_{3} * V_{h 3 i} +_{4} * V_{h 4 i}} & (4) \\ k_{4 i} = \frac{_{4} * V_{h 4 i}}{_{1} * V_{h 1 i} +_{2} * V_{h 2 i} +_{3} * V_{h 3 i} +_{4} * V_{h 4 i}} & (5) \end{matrix}$

(68) the linear density of the segment i of yarn Y is:

(69) 0 $\begin{matrix} _{yi} = \frac{V_{s}}{V_{q}} (\frac{V_{h 1 i}}{V_{z}} *_{1} + \frac{V_{h 2 i}}{V_{z}}_{2} + \frac{V_{h 3 i}}{V_{z}}_{3} + \frac{V_{h 1 i}}{V_{z}}_{4}) = \frac{1}{e_{q}} * (\frac{V_{h 1 i}}{V_{z}} *_{1} + \frac{V_{h 2 i}}{V_{z}}_{2} + \frac{V_{h 3 i}}{V_{z}}_{3} + \frac{V_{h 4 i}}{V_{z}}_{4}) & (6) \end{matrix}$

(70) wherein

(71) $e_{q} = \frac{V_{q}}{V_{z}}$
is the two-stage drafting ratio;

(72) 2) Take the segment with the lowest density as a reference segment, whose reference linear density is .sub.0; the reference linear speeds of the first back roller, the second back roller, the third back roller and the fourth back roller for this segment are respectively V.sub.h10, V.sub.h20, V.sub.h30, and V.sub.h40; and the reference blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, the fourth roving yarn ingredient for this segment are respectively k.sub.10, k.sub.20, k.sub.30, and k.sub.40,

(73) keep the linear speed of the middle roller constant, and
V.sub.Z=V.sub.h10+V.sub.h20+V.sub.h30+V.sub.h40(7);

(74) also keep two-stage drafting ratio

(75) $e_{q} = \frac{V_{q}}{V_{z}}$
is constant;

(76) wherein the reference linear speeds of the first back roller, the second back roller, the third back roller and the fourth back roller for this segment are respectively V.sub.h10, V.sub.h20, V.sub.h30, and V.sub.h40, which can be predetermined according to the material, the reference linear density .sub.0 and the reference blending ratios k.sub.10, k.sub.20, k.sub.30, and k.sub.40 of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, and the fourth roving yarn ingredient.

(77) 3) When the segment i of the yarn Y is drafted and blended, on the premise of known set linear density .sub.yi and blending ratios k.sub.1i, k.sub.2i, k.sub.3i, and k.sub.4i, the linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i, and V.sub.h4i of the first back roller, the second back roller, the third back roller, the the fourth back roller are calculated according to Equations (2)-(7);

(78) 4) Based on the reference linear speeds V.sub.h10, V.sub.h20, V.sub.h30, and V.sub.h40 for the reference segment, increase or decrease the rotation rates of the first back roller, the second back roller, the third back roller, or/and the fourth back roller to dynamically adjust the linear density or/and blending ratio for the segment i of yarn Y.

(79) 5) Let .sub.1=.sub.2=.sub.3=.sub.4= the Equation (6) can be simplified as

(80) $\begin{matrix} _{yi} = \frac{}{e_{q}} * \frac{V_{h 1 i} + V_{h 2 i} + V_{h 3 i} + V_{h 4 i}}{V_{z}} . & (8) \end{matrix}$

(81) According to Equations (2)-(5) and (7)-(8), the linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i, V.sub.h4i of the first back roller, the second back roller, the third back roller, and the fourth back roller are calculated. Based on the reference linear speeds V.sub.h10, V.sub.h20, V.sub.h30, and V.sub.h40, the rotation rates of the first back roller, the second back roller, the third back roller, or/and the fourth back roller are increased or decreased to reach the preset linear density and blending ratio for the segment i of the yarn Y.

(82) 6) At the moment of switching the segment i1 to the segment i of yarn Y, let the linear density of the yarn Y increase by dynamic increment .sub.yi, i.e., thickness change .sub.yi, on the basis of the reference linear density; and thus the first back roller, the second back roller, the third back roller and the fourth back roller have corresponding increments on the basis of the reference linear speed, i.e., when (V.sub.h10+V.sub.h20+V.sub.h30+V.sub.h40).fwdarw.(V.sub.h10+V.sub.h1i+V.sub.h20+V.sub.h2i+V.sub.h30+V.sub.h3i+V.sub.h40+V.sub.h4i), the linear density increment of yarn Y is:

(83) $\begin{matrix} _{yi} = \frac{}{e_{q} * V_{z}} * (V_{h 1 i} + V_{h 2 i} + V_{h 3 i} + V_{h 4 i}); \end{matrix}$

(84) Then the linear density .sub.yi of the yarn Y is expressed as

(85) $\begin{matrix} _{yi} =_{y 0} +_{yi} =_{y 0} + \frac{V_{h 1 i} + V_{h 2 i} + V_{h 3 i} + V_{h 4 i}}{V_{z}} * \frac{}{e_{q}} & (9) \end{matrix}$

(86) Let V.sub.i=V.sub.h1i+V.sub.h2i+V.sub.h31+V.sub.h4i, then Equation 9) is simplified as:

(87) $\begin{matrix} _{yi} =_{y 0} + \frac{V_{i}}{V_{z}} * \frac{}{e_{q}} & (10) \end{matrix}$

(88) The linear density of the yarn Y can be adjusted by controlling the sum of the linear speed increments V.sub.i of the first back roller, the second back roller, the third back roller, the fourth back roller.

(89) 7) Let .sub.1=.sub.2=.sub.3=.sub.4=, at the moment of switching the segment i1 to the segment i of the yarn Y, the blending ratios of the yarn Y in Equations (2)-(6) can be simplified as:

(90) $\begin{matrix} k_{1 i} = \frac{V_{h 10} + V_{h 1 i}}{V_{z} + V_{i}} & (11) \\ k_{2 i} = \frac{V_{h 20} + V_{h 2 i}}{V_{z} + V_{i}} & (12) \\ k_{3 i} = \frac{V_{h 30} + V_{h 3 i}}{V_{z} + V_{i}} & (13) \\ k_{4 i} = \frac{V_{h 40} + V_{h 4 i}}{V_{z} + V_{i}} & (14) \end{matrix}$

(91) The blending ratios of the yarn Y can be adjusted by controlling the linear speed increments of the first back roller, the second back roller, the third back roller, the fourth back roller;

(92) wherein
V.sub.h1i=k.sub.1i*(V.sub.Z+V.sub.i)V.sub.h10
V.sub.h2i=k.sub.2i*(V.sub.Z+V.sub.i)V.sub.h20
V.sub.h3i=k.sub.3i*(V.sub.Z+V.sub.i)V.sub.h30
V.sub.h4i=k.sub.4i*(V.sub.Z+V.sub.i)V.sub.h40

(93) 8) Let V.sub.h1i*.sub.1+V.sub.h2i*.sub.2+V.sub.h3i*.sub.3+V.sub.h4i*.sub.4=H and H is a constant, then V.sub.i is constantly equal to zero, and thus the linear density is unchanged when the blending ratios of the yarn Y are adjusted.

(94) 9) Let any one to three of V.sub.h1i, V.sub.h2i, V.sub.h3i, and V.sub.h4i be equal to zero, while the remaining ones are not zero, then the one to three roving yarn ingredients can be changed while the other roving yarn ingredients are unchanged. The adjusted blending ratio are:

(95) $k_{ki} = \frac{V_{hk 0} + V_{hki}}{V_{z} + V_{i}}$ $k_{ji} = \frac{V_{hj 0}}{V_{z} + V_{i}}$

(96) wherein k, j(1,2,3,4,5) and kj.

(97) 10) Let none of V.sub.h1i, V.sub.h2i, V.sub.h3i, and V.sub.h4i be equal to zero, then the four roving yarn ingredients in the yarn Y may be changed.

(98) 11) Let any one to three of V.sub.h1i, V.sub.h2i, V.sub.h3i, and V.sub.h4i be equal to zero, while the remaining ones are not zero, then the one to three roving yarn ingredients of the segment i of the yarn Y may be discontinuous.

Embodiment 4

(99) The method of dynamically configuring linear density and blending ratio of a yarn by four-ingredient asynchronous drafting disclosed in this embodiment is substantially the same as Embodiment 3, and the differences are:

(100) Set the initial linear speeds of the first back roller, a second back roller, a third back roller, and a fourth back roller as V.sub.h10, V.sub.h20, V.sub.h30, V.sub.h40; the initial linear speed of the middle roller V.sub.Z0=V.sub.h10+V.sub.h20+V.sub.h30+V.sub.h40.

(101) In addition, set V.sub.Zi=V.sub.h1(i-1)+V.sub.h2(i-1)+V.sub.h3(i-1)+V.sub.h4(i-1), and let the two-stage drafting ratio

(102) $e_{qi} = \frac{V_{qi}}{V_{zi}}$
constantly be equal to the set value e.sub.q;

(103) When drafting and blending the segment i of the yarn Y, take the linear density and the blending ratio of the segment i1 as a reference linear density and a reference blending ratio of segment i. On the premise of the known set linear density .sub.yi and blending ratios k.sub.1i, k.sub.2i, k.sub.3i, k.sub.4i, the linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i, V.sub.h4i of a first back roller, a second back roller, a third back roller, and a fourth back roller are calculated.

(104) On the basis of the segment i1, the rotation rates of the first back roller and/or the second back roller are adjusted to dynamically regulate the linear density or/and blending ratio of segment i of the yarn Y on line.

(105) In the method, V.sub.Zi=V.sub.h1(i-1)+V.sub.h2(i-1)+V.sub.h3(i-1)+V.sub.h4(i-1) and the two-stage drafting ratio is constant, and thus the speeds of the middle roller and the front roller are continually adjusted with the speeds of the back rollers, to avoid a substantial change of the drafting ratio of the yarn resulted from untimely adjusted speeds of the middle roller and the front roller as opposed to a relatively large speed adjustment of the combination of the back rollers, and effectively prevent yarn breakage.

(106) In addition, the operating speed of each roller is recorded in real time by a computer or other intellectual control unit, and thus the speeds of the middle roller and the front roller in the next step can be automatically calculated if the current speeds of the back rollers are known. The speed increments/decrements of the combination of the back rollers are calculated quickly with the above equations and models, to adjust the set blending ratio and linear density more easily and accurately.

Embodiment 5

(107) A device for spinning a multi-color slub yarn and a dotted yarn by four-ingredient two-stage drafting, comprises a control system and an actuating mechanism. The actuating mechanism includes four-ingredient separate/integrated asynchronous/synchronous two-stage drafting mechanism, a twisting mechanism and a winding mechanism; the two-stage drafting mechanism includes a first stage drafting unit and a second stage drafting unit.

(108) As shown in FIGS. 1 and 2, the first stage drafting unit includes combination 15 of back rollers and middle roller 3; combination 15 of back rollers has four rotational degrees of freedom and includes first back roller 6, second back roller 8, third back roller 10, and fourth back roller 12, which are set abreast on a same back roller shaft 21. The second stage drafting unit includes front roller 1 and middle roller 3. The numeral 4 refers to a top roller corresponding to middle roller 3, and the numerals 5, 7, 9, and 11 refer to four top rollers corresponding to the four back rollers. The numeral 2 refers to a top roller corresponding to front roller 1, 23, 26 and 27 are bearings.

(109) As shown in FIG. 2, a four-nested combination of back rollers with four rotational degrees of freedom is provided. The four movable back rollers 6, 8, 10, 12 are movably placed around the same core shaft 21 and respectively driven by pulleys 30, 32, 20, 24. The four back rollers are adjacently provided in sequence and the driving pulleys 30, 32, 20, 24 are located on both sides of the four back rollers.

(110) As shown in FIG. 5, the control system mainly includes a PLC programmable controller, a servo driver, a servo motor, Recommended Standard (RS) 232 serial port, RS 485 serial port, etc.

(111) The PLC programmable controller controls the motor by the servo driver, to drive the rollers, rings and spindles.

(112) The four back rollers are set abreast on a same back roller shaft, with the driving mechanisms set on both sides, which makes the mechanic structure more compact and the four types of roving yarns drafted by the four back rollers more close when blending, so as to effectively prevent the yarn from interferences and pollutions when the driving mechanisms work. In addition, the four basic colors yarns go through the bell mouth with a smaller clamping angle, rendering the blending of the yarn more even and almost unbreakable.

(113) TABLE-US-00003 TABLE 2 Parameter comparison between asynchronous drafting and synchronous drafting (taking 18.45 tex cotton yarn as an example) Synchronous Synchronous drafting for drafting for Synchronous double double drafting ingredients ingredients for single spinning spinning Asynchronous drafting for four ingredients spinning ingredient Ingredient Ingredient Ingredient Ingredient Ingredient Ingredient Ingredient Ingredient spinning 1 2 1 2 1 2 3 4 Roving 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 yarn weight (g/5 m) Back area 1.1-1.3 1.1-1.3 1.1-1.3 1.1-1.3 1.1-1.3 1.1-1.3 4*(k1 + k2 + 4*(k1 + k2 + 4*(k1 + k2 + 4*(k1 + k2 + drafting k3 + k4)/k1 k3 + k4)/k1 k3 + k4 + k3 + k4)/k1 ratio Changes with Changes k5)/k1 Changes the blending with the Changes with the ratio blending with the blending ratio blending ratio ratio Front area 24.6-20.8 22.7 49.2-41.6 45.4 45.4 45.4 108.4 108.4 108.4 108.4 drafting ratio Back unchanged changed unchanged changed Asynchronous Asynchronous Asynchronous Asynchronous rollers change unchange unchange change speed Middle unchanged unchanged unchanged unchanged unchanged roller speed Front unchanged unchanged unchanged unchanged unchanged roller speed Average 18.45 18.45 18.45 18.45 18.45 spinning number (tex) Linear invariable Limitedly invariable Limitedly Variable, adjustable speed variable variable variable Blending invariable invariable invariable Limitedly Variable, adjustable ratio variable variable Linear invariable invariable invariable Limitedly Variable, adjustable speed and variable blending ratio both variable Spinning Even yarn Slub yarn Even yarn Limited Even yarn Even yarn Even yarn Even yarn effect segmented color Any blending Any blending Any blending Any blending Limited slub yarn ratio ratio ratio ratio Color-blended Segment-color Segment-color slub yarn yarn blended yarn slub yarn

(114) Several preferable embodiments are described, in combination with the accompanying drawings. However, the invention is not intended to be limited herein. Any improvements and/or modifications by the skilled in the art, without departing from the spirit of the invention, would fall within protection scope of the invention.

Method and device of dynamically configuring linear density and blending ratio of yarn by four-ingredient asynchronous/synchronous drafted

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D01H5/36

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