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

A method of dynamically configuring a linear density and a blending ratio of a yarn by five-ingredient asynchronous/synchronous drafting, using an actuating mechanism, which includes a five-ingredient asynchronous/synchronous two-stage drafting mechanism, a twisting mechanism and a winding mechanism;

• the five-ingredient asynchronous/synchronous two-stage drafting mechanism further includes a first stage asynchronous drafting unit and a successive second stage synchronous drafting unit;
• the first stage asynchronous drafting unit further includes a combination of back rollers and a middle roller;
• the combination of back rollers has five rotational degrees of freedom and includes a first back roller, a second back roller, a third back roller, a fourth back roller and a fifth back roller, which are set abreast on a same back roller shaft;
• the first back roller, the second back roller, the third back roller, the fourth back roller and the fifth back roller move at speeds of Vh1, Vh2, Vh3, Vh4 and Vh5 respectively;
• the middle roller rotates at a speed of Vz;
• the second stage synchronous drafting unit includes a front roller and the middle roller;
• the front roller rotates at a surface linear speed of Vq;
• the method comprising:
• assuming linear densities of a first roving yarn ingredient, a second roving yarn ingredient, a third roving yarn ingredient, a fourth roving yarn ingredient and a fifth roving yarn ingredient drafted by the first back roller, the second back roller, the third back roller, the fourth back roller and the fifth back roller are respectively ρ1, ρ2, ρ3, ρ4 and ρ5, the linear density of the yarn Y drafted and twisted by the front roller is ρy,
• 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
• +
• V
• h
• ⁢
• ⁢
• 5
• ⋆
• ρ
• 5
• )
• (
• 1
• )
• wherein blending ratios of the first roving yarn ingredient, the second roving yarn ingredient, the third roving yarn ingredient, the fourth roving yarn ingredient and the fifth roving yarn ingredient are respectively k1, k2, k3, k4 and k5,
• k
• 1
• =
• ρ
• 1
• ⋆
• V
• h
• ⁢
• ⁢
• 1
• ρ
• 1
• ⋆
• V
• h
• ⁢
• ⁢
• 1
• +
• ρ
• 2
• ⋆
• V
• h
• ⁢
• ⁢
• 2
• +
• ρ
• 3
• ⋆
• V
• h
• ⁢
• ⁢
• 3
• +
• ρ
• 4
• ⋆
• V
• h
• ⁢
• ⁢
• 4
• +
• ρ
• 5
• ⋆
• V
• h
• ⁢
• ⁢
• 5
• k
• 2
• =
• ρ
• 2
• ⋆
• V
• h
• ⁢
• ⁢
• 2
• ρ
• 1
• ⋆
• V
• h
• ⁢
• ⁢
• 1
• +
• ρ
• 2
• ⋆
• V
• h
• ⁢
• ⁢
• 2
• +
• ρ
• 3
• ⋆
• V
• h
• ⁢
• ⁢
• 3
• +
• ρ
• 4
• ⋆
• V
• h
• ⁢
• ⁢
• 4
• +
• ρ
• 5
• ⋆
• V
• h
• ⁢
• ⁢
• 5
• k
• 3
• =
• ρ
• 3
• ⋆
• V
• h
• ⁢
• ⁢
• 3
• ρ
• 1
• ⋆
• V
• h
• ⁢
• ⁢
• 1
• +
• ρ
• 2
• ⋆
• V
• h
• ⁢
• ⁢
• 2
• +
• ρ
• 3
• ⋆
• V
• h
• ⁢
• ⁢
• 3
• +
• ρ
• 4
• ⋆
• V
• h
• ⁢
• ⁢
• 4
• +
• ρ
• 5
• ⋆
• V
• h
• ⁢
• ⁢
• 5
• k
• 4
• =
• ρ
• 4
• ⋆
• V
• h
• ⁢
• ⁢
• 4
• ρ
• 1
• ⋆
• V
• h
• ⁢
• ⁢
• 1
• +
• ρ
• 2
• ⋆
• V
• h
• ⁢
• ⁢
• 2
• +
• ρ
• 3
• ⋆
• V
• h
• ⁢
• ⁢
• 3
• +
• ρ
• 4
• ⋆
• V
• h
• ⁢
• ⁢
• 4
• +
• ρ
• 5
• ⋆
• V
• h
• ⁢
• ⁢
• 5
• k
• 5
• =
• ρ
• 5
• ⋆
• V
• h
• ⁢
• ⁢
• 5
• ρ
• 1
• ⋆
• V
• h
• ⁢
• ⁢
• 1
• +
• ρ
• 2
• ⋆
• V
• h
• ⁢
• ⁢
• 2
• +
• ρ
• 3
• ⋆
• V
• h
• ⁢
• ⁢
• 3
• +
• ρ
• 4
• ⋆
• V
• h
• ⁢
• ⁢
• 4
• +
• ρ
• 5
• ⋆
• V
• h
• ⁢
• ⁢
• 5
• keeping a ratio of linear speeds of the front roller and the middle roller Vq/Vz constant, and speeds of the front roller and the middle roller depend on a reference linear density of the yarn;
• dynamically adjusting the linear density or/and a blending ratio K of a yarn Y online, by adjusting rotation rates of the first back roller, the second back roller, the third back roller, the fourth back roller and the fifth back roller.