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

Patent metadata

Field	Value
Publication number	US-10316435-B2
Application number	US-201515309802-A
Country	US
Kind code	B2
Filing date	Jul 28, 2015
Priority date	Mar 27, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

The invention discloses a method of dynamically configuring linear density and blending ratio of yarn by two-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 the two 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 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.

First claim

The invention claimed is:

1. A method of dynamically configuring a linear density and a blending ratio of a yarn by two-ingredient asynchronous/synchronous drafting, the method comprising:
1) providing an actuating mechanism, wherein the actuating mechanism includes a two-ingredient asynchronous/synchronous two-stage drafting mechanism, a twisting mechanism and a winding mechanism; wherein the two-ingredient asynchronous/synchronous two-stage drafting mechanism includes a first stage asynchronous drafting unit and a successive second stage synchronous drafting unit;
2) providing a combination of a plurality of back roller and a middle roller included by the first stage asynchronous drafting unit; the combination of the back rollers has two rotational degrees of freedom and includes a first back roller, a second back roller, which are set abreast on a same back roller shaft; the first back roller, the second back roller move at the speeds V h1 , V h2 respectively; the middle roller rotates at the speed V 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 q ;
assuming the linear densities of a first roving yarn ingredient, a second roving yarn ingredient, drafted by the first back roller, the second back roller are respectively ρ 1 , ρ 2 , the linear density of the yarn Y drafted and twisted by the front roller is ρ y ;

ρ
y

=

1

V
q

⁢

(

V

h
⁢

⁢
1

*

ρ
1

+

V

h
⁢

⁢
2

*

ρ
2

)

(
1
)

blending ratios of the first roving yarn ingredient, the second roving yarn ingredient are respectively k 1 , k 2 ;

K
=

k
1

k
2

=

ρ
1

⁢

V

h
⁢

⁢
1

ρ
2

⁢

V

h
⁢

⁢
2

3) keeping the ratio of linear speeds of the front roller and the middle roller V q /V z constant, the speeds of the front roller and the middle roller depend on reference linear density of the yarn;
4) adjusting the rotation rates of the first back roller, the second back roller, so as to adjust the linear density of yarn Y or/and blending ratio, according to the changes of the blending ratio K of the yarn Y with a time t, and the changes of the linear density ρ y of the yarn Y with the time t, the changes of the surface linear speeds of the first back roller, the second back roller, are derived;
wherein surface linear speeds of the first back roller V h1 :

V

h
⁢

⁢
1

=

ρ
y

⁢
K

ρ
1

⁢

V
q

⁡

(

1
+
K

)

surface linear speeds of the second back roller V h2 :

V

h
⁢

⁢
2

=

ρ
y

ρ
2

⁢

V
q

⁡

(

1
+
K

)

.

Assignees

• Univ Jiangnan

Inventors

• Xue Yuan
• Gao Weidong
• Guo Mingrui
• Zhou Jian
• Yang Ruihua
• Wang Hongbo

Classifications

• D01H5/74

  Rollers {or roller bearings} · CPC title

• D01H5/36 Primary

  according to a pre-arranged pattern, e.g. to produce slubs · CPC title

• D01H5/44

  Adjusting drafting elements, e.g. altering ratch · CPC title

• D01H5/82

  Arrangements for coupling roller sections · CPC title

• D02G3/34

  Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns {(carding machines for producing decorative or fancy effects in products D01G; drafting machines with varying draft according to a pre-arranged pattern D01H5/36)} · CPC title