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

Patent metadata

Field	Value
Publication number	US-10351975-B2
Application number	US-201515306762-A
Country	US
Kind code	B2
Filing date	Jul 27, 2015
Priority date	Mar 27, 2015
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

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.

First claim

What is claimed is:

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 h1 , V h2 , V h3 , and V h4 respectively; the middle roller rotates at a speed of V 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 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 ρ 1 , ρ 2 , ρ 3 , and ρ 4 , 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

+

V

h
⁢

⁢
3

*

ρ
3

+

V

h
⁢

⁢
4

*

ρ
4

)

(
1
)

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 1 , k 2 , k 3 , and k 4 ,

k
1

=

ρ
1
″

ρ
1
″

+

ρ
2
″

+

ρ
3
″

+

ρ
4
″

=

ρ
1
′

ρ
1
′

+

ρ
2
′

+

ρ
3
′

+

ρ
4
′

=

ρ
1

*

V

h
⁢

⁢
1

ρ
1

*

V

h
⁢

Assignees

• Univ Jiangnan

Inventors

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

Classifications

• D01H5/36 Primary

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

• D01H5/74

  Rollers {or roller bearings} · CPC title