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

Abstract

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.

Claims

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 V.sub.h1, V.sub.h2, and V.sub.h3 respectively; the middle roller rotates at the speed V.sub.z; the second stage synchronous drafting unit includes a front roller and the middle roller; 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 drafted by the first back roller, the second back roller, the third back roller are respectively .sub.1, .sub.2, and .sub.3, the linear density of the yarn Y drafted and twisted by the front roller is .sub.y; $\begin{matrix} _{y} = \frac{1}{V_{q}} (V_{h 1} *_{1} + V_{h 2} *_{2} + V_{h 3} *_{3}) & (1) \end{matrix}$ the blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, and the third roving yarn ingredient are respectively k.sub.1, k.sub.2, and k.sub.3; $k_{1} = \frac{_{1}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{1}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{1} * V_{h 1}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3}}$ $k_{2} = \frac{_{2}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{2}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{2} * V_{h 2}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3}}$ $k_{3} = \frac{_{3}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{3}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{3} * V_{h 3}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3}}$ keeping the ratio of linear speeds of the front roller and the middle roller V.sub.q/V.sub.z 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 and a blending ratio K of a yarn Y online.

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

3. The method of claim 1, wherein if .sub.1=.sub.2=.sub.3=, then: 1) changing the speed of any one of the first back roller, the second back roller, and the third back roller, and keeping the speeds of the other two back rollers unchanged; the yarn ingredient and the linear density thereof of the yarn Y drafted by this back roller change accordingly; the linear density .sub.y of the yarn Y is adjusted as: $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 3}) or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 2}) or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * (V_{h 1} + V_{h 2} + V_{h 3} + V_{h 1})$ wherein .sub.y is a linear density change of the yarn, V.sub.h1, V.sub.h2 and V.sub.h3 is a speed change of the first back roller, the second back roller, and the third back roller respectively; 2) changing the speeds of any two back rollers of the first back roller, the second back roller, and the third back roller, and keeping the speed of the other back roller 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 yarn Y is adjusted as: $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + (V_{h 1} + V_{h 2})] or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + (V_{h 2} + V_{h 3})] or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + (V_{h 1} + V_{h 3})]$ 3) changing the speeds of three back rollers of the first back roller, the second back roller, and the third back roller simultaneously; 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 the yarn Y is adjusted as: $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [V_{h 1} + V_{h 2} + V_{h 3} + (V_{h 1} + V_{h 2} + V_{h 3})] .$

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

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

6. The method of claim 3, wherein further changing the speeds of the first back roller, the second back roller, and the third back roller, making the speeds of any two back rollers equal to zero simultaneously, while the speeds of the other one back rollers unequal to zero; the yarn ingredients of the yarn Y drafted by the any two 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: $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3})] (0 t T_{1})$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1})] (T_{1} t T_{2}) or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [(V_{h 2} + V_{h 2})] (T_{1} t T_{2}) or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [(V_{h 3} + V_{h 3})] (T_{1} t T_{2}) .$

7. The method of claim 3, wherein changing the speeds of the first back roller, the second back roller, and the third back roller, and keeping V.sub.h1*.sub.1+V.sub.h2*.sub.2+V.sub.h3*.sub.3=constant and .sub.1=.sub.2=.sub.3=, then the linear density of the yarn Y is thus fixed while the blending ratios of the ingredients thereof change; the blending ratios of the first yarn ingredient, the second yarn ingredient, and the third yarn ingredient are k.sub.1, k.sub.2, k.sub.3: $k_{1} = \frac{V_{h 1} + V_{h 1}}{V_{h 1} + V_{h 1} + V_{h 2} + V_{h 2} + V_{h 3} + V_{h 3}}$ $k_{2} = \frac{V_{h 2} + V_{h 2}}{V_{h 1} + V_{h 1} + V_{h 2} + V_{h 2} + V_{h 3} + V_{h 3}}$ $k_{3} = \frac{V_{h 3} + V_{h 3}}{V_{h 1} + V_{h 1} + V_{h 2} + V_{h 2} + V_{h 3} + V_{h 3}} .$

8. The method of claim 1, wherein further, 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 the 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 are V.sub.h1i, V.sub.h2i, V.sub.h3i, wherein i(1, 2, . . . , n); the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient are two-stage drafted and twisted to form segment i of the yarn Y, and the blending ratios k.sub.1i, k.sub.2i and k.sub.3i thereof are expressed as below: $\begin{matrix} k_{1 i} = \frac{_{1} * V_{h 1 i}}{_{1} * V_{h 1 i} +_{2} * V_{h 2 i} +_{3} * V_{h 3 i}} & (2) \\ k_{2 i} = \frac{_{2} * V_{h 2 i}}{_{1} * V_{h 1 i} +_{2} * V_{h 2 i} +_{3} * V_{h 3 i}} & (3) \\ k_{3 i} = \frac{_{3} * V_{h 3 i}}{_{1} * V_{h 1 i} +_{2} * V_{h 2 i} +_{3} * V_{h 3 i}} & (4) \end{matrix}$ the linear density of segment i of yarn Y is: $\begin{matrix} _{yi} = \frac{V_{z}}{V_{q}} * (\frac{V_{h 1 i}}{V_{z}} *_{1} + \frac{V_{h 2 i}}{V_{z}}_{2} + \frac{V_{h 3 i}}{V_{z}}_{3}) = \frac{1}{e_{q}} * (\frac{V_{h 1 i}}{V_{z}} *_{1} + \frac{V_{h 2 i}}{V_{z}}_{2} + \frac{V_{h 3 i}}{V_{z}}_{3}) & (5) \end{matrix}$ wherein $e_{q} = \frac{v_{q}}{v_{z}}$ is the two-stage drafting ratio; (1) 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 for this segment are respectively V.sub.h10, V.sub.h20, V.sub.h30; and the reference blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient for this segment are respectively k.sub.10, k.sub.20, k.sub.30; keep the linear speed of the middle roller constant, and
V.sub.z=V.sub.h10+V.sub.h20+V.sub.h30(6); (2) also keep two-stage drafting ratio $e_{q} = \frac{v_{q}}{v_{z}}$ constant; wherein the reference linear speeds of the first back roller, the second back roller, the third back roller for this segment are respectively V.sub.h10, V.sub.h20, V.sub.h30, which are predetermined according to the material, reference linear density .sub.0 and reference blending ratios k.sub.10, k.sub.20, k.sub.30 of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient; (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, the linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i, of the first back roller, the second back roller, the third back roller are calculated according to equations (2)-(6); (4) based on the reference linear speeds V.sub.h10, V.sub.h20, V.sub.h30 for the reference segment, increase or decrease the rotation rates of the first back roller, the second back roller, the third back roller to dynamically adjust the linear density or/and blending ratio for the segment i of the yarn Y.

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

10. The method of claim 9, wherein 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 reference linear density; and thus the first back roller, the second back roller, the third 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).fwdarw.(V.sub.h10+V.sub.h1i+V.sub.h20+V.sub.h2i+V.sub.h30 V.sub.h3i) the linear density increment of yarn Y is: $_{yi} = \frac{}{e_{q} + V_{z}} * (V_{h 1 i} + V_{h 2 i} + V_{h 3 i});$ then the linear density .sub.yi of the yarn Y is expressed as $\begin{matrix} _{yi} =_{y 0} +_{yi} =_{y 0} + \frac{V_{h 1 i} + V_{h 2 i} + V_{h 3 i}}{V_{z}} * \frac{}{e_{q}}; & (8) \end{matrix}$ let V.sub.1=V.sub.h1i+V.sub.h2i+V.sub.h3i; then equation (8) is simplified as: $\begin{matrix} _{yi} =_{y 0} + \frac{V_{1}}{V_{z}} * \frac{}{e_{q}}; & (9) \end{matrix}$ the linear density of yarn Y is 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.

11. The method of claim 10, wherein let .sub.1=.sub.2=.sub.3= 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)-(4) are simplified as: $\begin{matrix} k_{1 i} = \frac{V_{h 10} + V_{h 1 i}}{V_{z} + V_{i}} & (10) \\ k_{2 i} = \frac{V_{h 20} + V_{h 2 i}}{V_{z} + V_{i}} & (11) \\ k_{3 i} = \frac{V_{h 30} + V_{h 3 i}}{V_{z} + V_{i}}; & (12) \end{matrix}$ the blending ratios of the yarn Y are adjusted by controlling the linear speed increments of the first back roller, the second back roller, the third 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.

12. The method of claim 11, wherein let V.sub.h1i*.sub.1+V.sub.h2i*.sub.2+V.sub.h3i*.sub.3=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.

13. The method of claim 11, wherein let any one to two of V.sub.h1i, V.sub.h2i, V.sub.h3i be equal to zero, while the remaining ones are not zero, then the one to two roving yarn ingredients are changed while the other roving yarn ingredients are unchanged; 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) and kj; let none of V.sub.h1i, V.sub.h2i, V.sub.h3i be equal to zero, then the proportion of the three roving yarn ingredients in the yarn Y is changed.

14. The method of claim 11, wherein let any one to two of V.sub.h1i, V.sub.h2i, V.sub.h3i be equal to zero, while the remaining ones are not zero, then the one to two roving yarn ingredients of the segment i of the yarn Y are discontinuous.

15. A device for implementing a method of dynamically configuring a linear density and a blend ratio of a yarn by three-ingredient asynchronous/synchronous drafting, comprising: a control system, and an actuating mechanism, wherein the actuating mechanism includes a three-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 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 second stage drafting unit includes a front roller and the middle roller.

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) As demonstrated by FIG. 1-5, a method of dynamically configuring linear density and blending ratio of yarn by three-ingredient asynchronous/synchronous drafting is disclosed, comprising:

(8) 1) 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 11 and a middle roller 3; The combination of back rollers has three rotational degrees of freedom and includes a first back roller 5, a second back roller 7, a third back roller 9, which are set abreast on a same back roller shaft. The second stage synchronous drafting unit includes a front roller 1 and the middle roller 3. 4 is the top roller of middle roller 3. 6, 8, 10 are the top rollers of three back rollers respectively. 2 is the top roller of front roller 1. 14 and 13 are the winding device and guider roller respectively. 15 is the yarn Y. 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.

(10) The first back roller, the second back roller, the third back roller move at the speeds V.sub.h1, V.sub.h2, and V.sub.h3 respectively. The middle roller rotates at the speed V.sub.z. The second stage synchronous drafting unit includes a front roller and the middle roller. The front roller rotates at the surface linear speed V.sub.q.

(11) FIG. 2 shows a three-nested combination of back rollers with three rotational degrees of freedom. The three movable back rollers 5, 7, 9 are respectively driven by a core shaft and pulleys 16, 22 and 17.

(12) FIG. 4 illustrates the yarn route of the two-stage drafting. During the process of spinning, the three roving yarns are fed in parallel into the corresponding independently driven first stage drafting mechanism to be asynchronously drafted, and synchronously drafted and integrated by the second stage drafting mechanism, and then twisted to form a yarn Y. Dynamical change of blend ratio and yarn density can be controlled exactly by the first-stage asynchronous drafting. The yarn density can be controlled by the second-stage drafting. Thus the yarn can be produces with much fine mixing and low breaking ration.

(13) As figured out by 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. PLC programmable controller controls rollers, ring rails and spindles by servo motor which is controlled by servo driver.

(14) 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 .sub.1, .sub.2, and .sub.3, the linear density of the yarn Y drafted and twisted by the front roller is .sub.y.

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

(16) The blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, and the third roving yarn ingredient are respectively k.sub.1, k.sub.2, and k.sub.3.

(17) $k_{1} = \frac{_{1}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{1}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{1} * V_{h 1}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3}}$ $k_{2} = \frac{_{2}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{2}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{2} * V_{h 2}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3}}$ $k_{3} = \frac{_{3}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{3}^{}}{_{1}^{} +_{2}^{} +_{3}^{}} = \frac{_{3} * V_{h 3}}{_{1} * V_{h 1} +_{2} * V_{h 2} +_{3} * V_{h 3}}$

(18) 3) Keeping the ratio of linear speeds of the front roller and the middle roller V.sub.q/V.sub.z constant, the speeds of the front roller and the middle roller depend on reference linear density of the yarn;

(19) 4) The linear density of yarn Y or/and blending ratio can be dynamically adjusted on line, by adjusting the rotation rates of the first back roller, the second back roller, the third back roller.

(20) 5) Further, the blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient are set respectively as k.sub.1, k.sub.2, and k.sub.3. The ratios of blending ratios of the yarn Y are respectively K.sub.1, and K.sub.2.

(21) $K_{1} = \frac{k_{1}}{k_{2}} = \frac{_{1} V_{h 1}}{_{2} V_{h 2}}$ $K_{2} = \frac{k_{1}}{k_{3}} = \frac{_{1} V_{h 1}}{_{3} V_{h 3}}$

(22) Linear density of yarn Y is

(23) $_{y} = \frac{V_{h 1} *_{1} + V_{h2} *_{2} + V_{h 3} *_{3}}{V_{q}}$

(24) then a surface linear speed of the back roller 1:

(25) 0 $V_{h 1} = \frac{_{y} V_{q}}{_{1} (1 + \frac{1}{K_{1}} + \frac{1}{K_{2}})}$

(26) a surface linear speed of the back roller 2:

(27) $V_{h 2} = \frac{_{y} V_{q}}{_{2} (1 + K_{1} + \frac{K_{1}}{K_{2}})}$

(28) a surface linear speed of the back roller 3:

(29) $V_{h 3} = \frac{_{y} V_{q}}{_{3} (1 + K_{2} + \frac{K_{2}}{K_{1}})}$

(30) wherein .sub.1, .sub.2 and .sub.3 are constants, and K.sub.i and .sub.y are functions changing with time t.

(31) 6) Further, let .sub.1=.sub.2=.sub.3=, then:

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

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

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

(35) (2) change the speeds of any two back rollers of the first back roller, the second back roller, and the third back roller, and keep the speeds of the other backer roller 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 yarn Y is adjusted as:

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

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

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

(39) 7) Further, change the speeds of the first back roller, the second back roller, and the third back roller, and make the speed of any of back rollers equal to zero, while the speeds of the other two 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 two yarn ingredients are continuous. The linear density .sub.y of yarn Y is adjusted as:

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

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

(42) 8) Further, change the speeds of the first back roller, the second back roller, and the third back roller, make the speeds of any two 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 two back rollers are thus discontinuous, while the other yarn ingredients are continuous. The linear density .sub.y of the yarn Y is adjusted as:

(43) (1) When the first back roller is unequal to zero

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

(45) wherein T.sub.3 is time points, and T.sub.1T.sub.2T.sub.3.

(46) (2) When the second back roller is unequal to zero

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

(48) (3) When the third back roller is unequal to zero

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

(50) 9) further change the speeds of the first back roller, the second back roller, and the third back roller, make the speeds of any two back rollers equal to zero simultaneously, while the speeds of the other one 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 one yarn ingredients are continuous. The linear density .sub.y of the yarn Y is adjusted as:

(51) 0 $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1}) + (V_{h 2} + V_{h 2}) + (V_{h 3} + V_{h 3})] (0 t T_{1})$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [(V_{h 1} + V_{h 1})] (T_{1} t T_{2}) or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [(V_{h 2} + V_{h 2})] (T_{1} t T_{2}) or$ $_{y}^{} =_{y} +_{y} = \frac{}{V_{q}} * [(V_{h 3} + V_{h 3})] (T_{1} t T_{2}) .$

(52) 10) Further, change the speeds of the first back roller, the second back roller, and the third back roller, and keep

(53) V.sub.h1*.sub.1+V.sub.h2*.sub.2+V.sub.h3*.sub.3=constant

(54) and .sub.1=.sub.2=.sub.3=,

(55) then the linear density of the yarn Y is thus fixed while the blending ratios of the ingredients thereof change; the blending ratios of the first yarn ingredient, the second yarn ingredient, and the third yarn ingredient are k.sub.1, k.sub.2, k.sub.3.

(56) $k_{1} = \frac{V_{h 1} + V_{h 1}}{V_{h 1} + V_{h 1} + V_{h 2} + V_{h2} + V_{h 3} + V_{h 3}}$ $k_{2} = \frac{V_{h 2} + V_{h 2}}{V_{h 1} + V_{h 1} + V_{h 2} + V_{h2} + V_{h 3} + V_{h 3}}$ $k_{3} = \frac{V_{h 3} + V_{h 3}}{V_{h 1} + V_{h 1} + V_{h 2} + V_{h2} + V_{h 3} + V_{h 3}}$

Embodiment 2

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

(58) 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 the 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 are V.sub.h1i, V.sub.h2i, V.sub.h3i, wherein i(1, 2, . . . , n) The first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient ingredient are two-stage drafted and twisted to form segment i of the yarn Y, and the blending ratios k.sub.1i, k.sub.2i and k.sub.3i thereof are expressed as below:

(59) $\begin{matrix} k_{11} = \frac{_{1} * V_{h 11}}{_{1} * V_{h 11} +_{2} * V_{h 21} +_{3} * V_{h 31}} & (2) \\ k_{21} = \frac{_{2} * V_{h 21}}{_{1} * V_{h 11} +_{2} * V_{h 21} +_{3} * V_{h 31}} & (3) \\ k_{31} = \frac{_{3} * V_{h 31}}{_{1} * V_{h 11} +_{2} * V_{h 21} +_{3} * V_{h 31}} & (4) \end{matrix}$

(60) the linear density of segment i of yard Y is:

(61) $\begin{matrix} _{yi} = \frac{V_{z}}{V_{q}} * (\frac{V_{h 11}}{V_{x}} *_{1} + \frac{V_{h 21}}{V_{}}_{2} + \frac{V_{}}{V_{x}}_{3}) = \frac{1}{e_{q}} * (\frac{V_{h 11}}{V_{x}} *_{1} + \frac{V_{h 21}}{V_{x}}_{2} + \frac{V_{h 31}}{V_{x}}_{3}) & (5) \end{matrix}$

(62) wherein

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

(64) 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 for this segment are respectively V.sub.h10, V.sub.h20, V.sub.h30; and the reference blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient for this segment are respectively k.sub.10, k.sub.20, k.sub.30,

(65) Keep the linear speed of the middle roller constant, and
V.sub.z=V.sub.h10+V.sub.h20+V.sub.h30(6);
also keep two-stage drafting ratio

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

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

(68) 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, the linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i, of the first back roller, the second back roller, the third back roller are calculated according to Equations (2)-(6);

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

(70) 5) Further, let .sub.1=.sub.2=.sub.3=

(71) then Equation (5) can be simplified as

(72) $\begin{matrix} _{yi} = \frac{}{e_{q}} * \frac{V_{h 11} + V_{h 21} + V_{h 31}}{V_{1}}; & (7) \end{matrix}$

(73) According to Equations (2)-(4) and (6)-(7), the linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i of the first back roller, the second back roller, the third back roller are calculated; based on the reference linear speeds V.sub.h10, V.sub.h20, V.sub.h30, the rotation rates of the first back roller, the second back roller, the third back roller are increased or decreased to reach the preset linear density and blending ratio for the segment i of yarn Y.

(74) 6) Further, 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 reference linear density; and thus the first back roller, the second back roller, the third 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).fwdarw.(V.sub.h10+V.sub.h1i+V.sub.h20+V.sub.h2i+V.sub.h30+V.sub.h3i), the linear density increment of yarn Y is:

(75) $_{yi} = \frac{}{e_{q} V_{z}} * (V_{h 11} + V_{h 21} + V_{h 31}) .$

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

(77) $\begin{matrix} _{y i} =_{y 0} +_{yi} =_{y 0} + \frac{V_{h 1 i} + V_{h 2 i} + V_{h 3 i}}{V_{z}} * \frac{}{e_{q}} . & (8) \end{matrix}$

(78) Let V.sub.1=V.sub.h1i+V.sub.h2i+V.sub.h3i,

(79) then Equation (8) is simplified as:

(80) $\begin{matrix} _{y i} =_{y 0} + \frac{V_{1}}{V_{z}} * \frac{}{e_{q}} . & (9) \end{matrix}$

(81) The linear density of 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.

(82) 7) Further, let .sub.1=.sub.2=.sub.3=

(83) at the moment of switching the segment i1 to the segment i of the yarn Y, the blending ratios of the yarn Yin Equations (2)-(3) can be simplified as:

(84) 0 $\begin{matrix} k_{1 i} = \frac{V_{h 10} + V_{h 1 i}}{V_{z} + V_{i}} & (10) \\ k_{2 i} = \frac{V_{h 20} + V_{h 2 i}}{V_{z} + V_{i}} & (11) \\ k_{3 i} = \frac{V_{h 30} + V_{h 3 i}}{V_{z} + V_{i}} & (12) \end{matrix}$

(85) 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;

(86) 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.

(87) 8) Further, let V.sub.h1i*.sub.1+V.sub.h2i*.sub.2+V.sub.h3i*.sub.3=H

(88) 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.

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

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

(91) wherein k, j(1, 2, 3), and kj.

(92) 10) Further, let none of V.sub.h1i, V.sub.h2i, V.sub.h3i be equal to zero, then the proportion of the three roving yarn ingredients in the yarn Y may be changed.

(93) 11) Further, let any one to two of V.sub.h1i, V.sub.h2i, V.sub.h3i be equal to zero, while the remaining ones are not zero, then the one to two roving yarn ingredients of the segment i of the yarn Y may be discontinuous.

Embodiment 3

(94) The method of dynamically configuring linear density and blending ratio of a yarn by three-ingredient asynchronous drafting disclosed in this embodiment is substantially the same as Embodiment 2, and the differences are:

(95) Set the initial linear speeds of the first back roller, a second back roller, a third back roller as V.sub.h10, V.sub.h20, V.sub.h30; the initial linear speed of the middle roller V.sub.z0=V.sub.h10+V.sub.h20+V.sub.h30

(96) In addition, set V.sub.Zi=V.sub.h1(i-1)+V.sub.h2(i-1)+V.sub.h3(i-1),

(97) and let the two-stage drafting ratio

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

(99) 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, the linear speeds V.sub.h1i, V.sub.h2i, V.sub.h3i of a first back roller, a second back roller, a third back roller are calculated.

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

(101) In the method, V.sub.Zi=V.sub.h1(i-1)+V.sub.h2(i-1)+V.sub.h3(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.

(102) 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.

(103) TABLE-US-00003 TABLE 3 Parameter comparison between asynchronous drafting and synchronous drafting (taking 18.45tex cotton yarn as an example) Synchronous drafting Synchronous drafting Asynchronous drafting for double ingredients for double ingredients for three ingredients Synchronous drafting spinning spinning spinning for single ingredient Ingredi- Ingredi- Ingredi- Ingredi- Ingredi- Ingredi- Ingredi- spinning ent 1 ent 2 ent 1 ent 2 ent 1 ent 2 ent 3 Roving yarn 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 weight (g/5 in) 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 3(k1 + 3(k1 + 3(k1 + drafting k2 + 3)/k1 k2 + k3)/k2 k2 + k3)/k3 ratio Changes with Changes with Changes with the blending the blending the blending ratio ratio ratio Front area 24.6-20.8 32.7 49.2-41.6 49.2-41.6 45.4 45.4 81.6 81.6 81.6 drafting ratio Back roller unchanged changed unchanged changed Asynchronous Asynchronous Asynchronous speed change change change Middle roller unchanged unchanged unchanged unchanged unchanged speed Front roller unchanged unchanged unchanged unchanged unchanged speed Average 18.45 18.45 18.45 18.45 18.45 spinning number (tex) Linear speed invariable Limitedly invariable Limitedly Variable, adjustable variable variable variable Blending invariable invariable invariable Limitedly Variable, adjustable ratio variable variable Linear speed invariable invariable invariable Limitedly Variable, adjustable and blending variable ratio both variable Spinning Even yarn Slub yarn Even yarn Limited Even yarn Even yarn Even yarn Even yarn effect segmented Any Any Any Any color blending blending blending blending Limited ratio ratio ratio ratio slub yarn Color- Segment- Segment- slub yarn blended color color yarn blended blended yarn yarn

(104) 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 three-ingredient asynchronous/synchronous drafted

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