CN109825916B

CN109825916B - Double-channel hollow spindle fancy yarn forming device and method

Info

Publication number: CN109825916B
Application number: CN201910190432.6A
Authority: CN
Inventors: 费强; 薛元; 霍允乐
Original assignee: Jiangyin Meilun Yarn Co ltd
Current assignee: Jiangyin Meilun Yarn Co ltd
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2024-04-19
Anticipated expiration: 2039-03-13
Also published as: CN109825916A

Abstract

The invention provides a double-channel hollow spindle fancy yarn forming device and a method, wherein the yarn forming device comprises a first channel, a first auxiliary channel, a second auxiliary channel and a yarn fixing channel; the three front rollers on the channel can be arranged in a relative rotation way; the first and second component yarns are alternately twisted by the first twisting points to form a fancy yarn main body; the second twisting point is provided with a hollow spindle, the fancy yarn main body passes through the hollow spindle, the hollow spindle rotates rapidly, and the fixed yarn on the hollow spindle is intersected with the fancy yarn main body and coats the fancy yarn main body. The invention realizes the one-step spinning of fancy yarn, and simultaneously realizes the online change of the color and the form of the bamboo joints, the large belly, the knots, the circles and the braids of the fancy yarn by the technical means of regulating and controlling the speed of the cooperative feeding of the fancy yarn and the core yarn into the twisting point, regulating and controlling the linear density and the blending ratio of the fancy yarn, regulating and controlling the twist of the core yarn, regulating and controlling the switching of the core yarn and the fancy yarn, and the like, thereby expanding the new variety of the fancy yarn.

Description

Double-channel hollow spindle fancy yarn forming device and method

Technical Field

The invention relates to the technical field of spinning in textile engineering, in particular to a double-channel hollow spindle fancy yarn forming device and method.

Background

The hollow spindle spinning machine is used for producing fancy yarn by a two-step method, wherein the first step is that core yarn, decorative yarn and solid yarn are spun respectively; secondly, false twisting is carried out on the core yarns and the decoration yarns fed at different speeds by using a hollow spindle device, the decoration yarns are twisted on the core yarns to form knots, rings, braids and other patterns by overfeeding the core yarns, and then the formed patterns are bound and fixed by using the fixed yarns unreeled from the hollow spindle to form the hollow spindle fancy yarns. The main problems of producing fancy yarn by a hollow spindle spinning machine are as follows:

1) The change of the color of the fancy yarn cannot be regulated and controlled when the fancy yarn is spun by the hollow spindle: in order to realize the color change of fancy yarns, one is to regulate and control the mutual wrapping relation among the decorative yarns, the core yarns and the fixed yarns, and the other is to regulate and control the color of the decorative yarns. The traditional hollow spindle spinning machine for producing fancy yarn does not have a means for regulating and controlling the mutual wrapping relation among the decorative yarn, the core yarn and the fixed yarn, and the color of the decorative yarn cannot be regulated and controlled, so that the color change of the fancy yarn cannot be regulated and controlled;

2) The size and color of knots, loops and braids cannot be regulated and controlled when the hollow spindle spins fancy yarns: the hollow spindle fancy yarn comprises three components (core yarn, decorative yarn and solid yarn), wherein the decorative yarn is a main body for forming fancy yarn knots, rings and braids, and the traditional hollow spindle spinning machine cannot regulate the thickness and color change of the decorative yarn on line, so that the size and color change of knots, rings and braids cannot be regulated;

3) When the hollow spindle spins the three-thread fancy yarn comprising (core yarn + fancy yarn + solid yarn), only one fancy yarn and one core yarn can be simply combined, and multiple combination modes of a plurality of fancy yarns and a plurality of core yarns can not be realized, so that the on-line regulation and control of the combination modes of the fancy yarn and the core yarn can not be realized.

4) The change of the coating ratio of the core yarn, the decorative yarn and the solid yarn cannot be regulated and controlled when the hollow spindle spins the fancy yarn: when a three-thread fancy yarn including (core yarn+decorative yarn+solid yarn) is spun by a hollow spindle, a regulating means is absent in the process of twisting the core yarn and the decorative yarn and then coating the yarn with the solid yarn, so that the change of the coating ratio of the core yarn, the decorative yarn and the solid yarn cannot be regulated on line.

5) Low efficiency, high production cost, etc. Because the hollow spindle spinning machine has the problems, in the spinning process of fancy yarns, the wrapping structure, the shape, the color, the style and the hand feeling of the fancy yarns are difficult to change on line through the regulation and control of spinning equipment and spinning technology, and the requirements of the fancy yarn clothing fabric with various shapes, rich and fine colors and flexible front guard style cannot be met.

Disclosure of Invention

The invention aims to provide a double-channel hollow spindle fancy yarn spinning device and a one-step forming method, which combine decorative yarns, core yarns and fixed yarns into a complex fancy yarn comprising combined flowers such as knots, loops, braids and the like through alternating drafting, cooperative conveying, alternating twisting, cladding and other processes so as to solve at least one technical problem in the prior art.

In order to solve the technical problems, the invention provides a double-channel hollow spindle fancy yarn forming device, which comprises a first channel for passing a first component yarn, a first auxiliary channel for passing a second component yarn and a second auxiliary channel for passing a third component yarn;

The first channel is sequentially provided with a back roller, a middle roller, a first front roller, a first twisting point and a second twisting point; the first auxiliary channel is sequentially provided with a second front roller, the first twisting point and the second twisting point; a third front roller, the first twisting point and the second twisting point are sequentially arranged on the second auxiliary channel; in the circumferential direction, the first front roller, the second front roller and the third front roller can be arranged in a relative rotation mode;

The area between the rear roller, the middle roller and the first front roller on the first channel is a drafting area, and an interactive twisting triangle area is formed among the first front roller, the second front roller, the third front roller and the first twisting point; the first front roller, the second front roller and the third front roller respectively and independently move, and respectively introduce corresponding component yarns into an interactive twisting triangle; one or a plurality of first component yarns, second component yarns and third component yarns are led to the alternating twisting triangular area and twisted to form a fancy yarn main body;

The second twisting point is provided with a hollow spindle, the fancy yarn main body passes through the hollow spindle, the hollow spindle rotates rapidly, and the fixed yarn on the hollow spindle is intersected with the fancy yarn main body and coats the fancy yarn main body.

The invention breaks through the technical bottleneck of hollow spindle spinning in the aspect of fancy yarn forming, realizes the one-step spinning of fancy yarns (comprising core yarns, ornamental yarns and solid yarns) by carrying out alternating drafting, cooperative output, alternating twisting and cladding processes through a one-step method, and simultaneously realizes the online change of the colors and the forms of fancy yarn bamboo joints, large belly, knots, circles and braids by regulating and controlling the output speed of the ornamental yarns and the core yarns, the linear density and blending ratio of the ornamental yarns, the twist of the core yarns, the switching of the core yarns and the ornamental yarns and other technical means, and expands new varieties of fancy yarns.

Further, the yarn feeding device also comprises a filament bobbin, wherein the filament bobbin is sleeved on the hollow spindle and synchronously rotates along with the hollow spindle, and the fixed yarn is wound on the filament bobbin.

Further, the hollow spindle includes a false twister for twisting the fancy yarn body.

Further, the rear roller and the middle roller are connected through a first transmission gear set, and the first transmission gear set is used for keeping the traction ratio (linear velocity ratio) between the middle roller and the rear roller constant and not more than 1.4.

The invention forms a first-stage drafting unit (namely a first drafting zone) between the middle roller and the rear roller, the front roller and the middle roller form a second-stage drafting unit (namely a second drafting zone), the speed ratio of the middle roller and the rear roller in the same channel is constant and less than 1.4, and the speed ratio is synchronously changed relative to the front roller in the channel, and the speed ratio of the middle roller and the rear roller in different channels is alternately changed relative to the front roller, so that the alternating drafting of the first component yarn is realized. Of particular importance, the first draft is pre-draft, the first draft ratioA constant C is a constant draft, a draft ratio of the first-order draft/>The continuity of the roving can be ensured, and no drafting singular point is generated in the first drafting zone. Meanwhile, the fiber in the roving can be straightened, tensioned and oriented in the pre-drafting process, so that the preparation of sliding in the main drafting process is finished, the breakage rate or the singular point rate in the main drafting process is reduced, the drafting and twisting process is more stable, and the labor intensity of workers is greatly reduced.

Further, the first auxiliary channel further comprises a first drawing roller (a first unwinding shaft), and the first drawing roller, the second front roller, the first twisting point and the second twisting point are sequentially arranged;

And/or the second auxiliary channel further comprises a second drawing roller (a second unwinding shaft), and the second drawing roller, the third front roller, the first twisting point and the second twisting point are sequentially arranged.

Preferably, an upper leather roller is correspondingly arranged above the middle roller, and the yarn forming device further comprises an upper leather ring sleeved on the upper pin and the middle leather roller and keeping synchronous movement with the middle roller, and a lower leather ring sleeved on the lower pin and the middle roller and keeping synchronous movement with the middle roller; the distance between the holding jaws of the upper leather collar and the lower leather collar and the jaw line of the front roller is less than 3mm.

Two-stage draftingFor dynamic main drafting, the speed of the middle roller is changed relative to the front roller, when the blending ratio K=0% of the first component yarn in the first channel, the channel yarn forms a drafting singular point in the second drafting zone when the second level drafting ratio e _q = infinity of the channel yarn, the distance delta between the drafting singular point and the front roller nip is less than or equal to 3mm (the gauge of the rear roller and the middle roller is generally greater than 25mm in the prior art, the drafting singular point positions in the first drafting zone are randomly distributed between the middle roller and the rear roller, when the drafting singular point is more than 3mm away from the middle roller nip, the time for the drafting singular point to be fed into the middle roller nip again has an uncertain factor, if the matching is poor, either coarse detail is generated or spinning broken ends are caused, so that spinning becomes an unstable process, and the reliability and the spinning quality are affected. When/>When the spinning machine is gradually increased, along with synchronous starting of the rear roller and the middle roller, the fiber strands held by the upper leather collar and the lower leather collar are instantaneously fed into a jaw of the front roller to carry out secondary drafting, so that the drafting singular point positioned in the secondary drafting zone does not influence the stability of spinning.

Further, the device also comprises a rear roller shaft, a middle roller shaft and an auxiliary shaft;

The rear roller is rotatably sleeved on the rear roller shaft (for example, by a bearing) in the circumferential direction of the rear roller shaft; in the circumferential direction of the middle roller shaft, the middle roller is movably sleeved on the middle roller shaft in a relatively rotatable manner; the first transmission gear set comprises a first driving gear, a first bridging gear and a first driven gear which are sequentially meshed for transmission; the first driving gear is fixedly connected with the rear roller in a coaxial manner, and the first driven gear is fixedly connected with the middle roller in a coaxial manner; the first bridge gear is sleeved on the auxiliary shaft in a relatively fixed mode.

Therefore, the back roller and the middle roller can be synchronously driven to operate through the auxiliary shaft, so that the feeding speed of the first component yarn is adjusted.

Further, the front roller shaft is also included; the first front roller is sleeved on the front roller shaft relatively fixedly in the circumferential direction of the front roller shaft; the second front roller and the third front roller are sleeved on the front roller shaft in a relatively rotatable manner.

Further, the device also comprises a second front shaft and a third front shaft, wherein the second front shaft is connected with the second front roller through a second gear transmission pair; the third front shaft is connected with the third front roller through a third gear transmission pair; the second front roller and the third front roller can be respectively driven to rotate by the second front shaft and the third front shaft.

Further, the second gear pair includes: the second main gear and the second auxiliary gear are meshed with each other for transmission, the second main gear is fixedly sleeved on the second front shaft, and the second auxiliary gear is fixedly connected with the second front roller in a coaxial mode;

The third gear pair includes: the third main gear and the third auxiliary gear are meshed with each other for transmission, the third main gear is fixedly sleeved on the third front shaft, and the third auxiliary gear is coaxially and fixedly connected with the third front roller.

Wherein the rear roller, the middle roller and the front roller are preferably nested rollers.

And an upper leather roller is correspondingly arranged above each rear roller, each middle roller and each front roller, and the upper leather roller is matched with the rollers below to clamp yarns.

Further, the device also comprises a control system and a servo driving system; the servo driving system comprises a servo driver and a servo motor; the control system comprises a controller (preferably a PLC programmable controller) and a rotating speed sensor; the controller is connected with the servo motor through a servo driver in sequence;

The servo motor includes: the device comprises a first servo motor for driving a front roller shaft, a second servo motor for driving a second front shaft, a third servo motor for driving an auxiliary shaft to rotate, a fourth servo motor for driving a first drawing roller to rotate, a fifth servo motor for driving the first drawing roller to rotate, a sixth servo motor for driving the third front shaft and a hollow spindle motor for driving a hollow spindle to rotate, wherein the first servo motor is used for driving the front roller shaft;

The rotational speed sensor includes: the hollow spindle sensor is used for monitoring the rotating speeds of the front roller shaft, the second front shaft, the auxiliary shaft, the first drawing roller, the second drawing roller and the third front shaft respectively, and comprises a first sensor, a second sensor, a third sensor, a fourth sensor, a fifth sensor and a sixth sensor and a hollow spindle sensor used for monitoring the rotating speeds of the hollow spindles.

The controller in the invention sequentially controls the feeding speed of the component yarn on the yarn channel through the servo driver and the servo motor, the rotating speed sensor monitors the actual feeding speed of the component yarn in real time, the monitoring value is fed back to the controller, and the controller can adjust the magnitude of the control signal on the yarn channel according to the monitoring value.

Further, the twisting mechanism comprises a ring plate, and the controller controls the ring plate to move through a servo driver and a servo motor. In addition, the control system includes a series of instructions and a modular program.

Further, the control system further comprises a first comparison module, the first comparison module is respectively connected with the third sensor, the fourth sensor, the fifth sensor and the controller, the first comparison module is used for monitoring the rotation speed ratio between the auxiliary shaft, the first extraction roller and the second extraction roller, and the controller regulates and controls the rotation speed of the auxiliary shaft, the first extraction roller and the second extraction roller according to the numerical value fed back by the first comparison module, so that the blending ratio of the first component yarn, the second component yarn and the third component yarn is regulated and controlled.

Further, the outer diameter sizes of the first front roller, the second front roller and the third front roller are the same.

By adopting the technical scheme, the invention has the following beneficial effects:

The invention provides a double-channel hollow spindle fancy yarn forming device, which is characterized in that a hollow spindle spinning system with two paths of spinning channels and two twisting points is constructed, the first twisting point (at the first twisting point) is subjected to alternate twisting and forms a fancy yarn main body, the second twisting point (at the second twisting point) is subjected to cladding twisting by the output solid yarn and the formed fancy yarn main body to form fancy yarn comprising decorative yarn, core yarn and solid yarn, and the hollow spindle fancy yarn spinning of the decorative yarn, the core yarn and the solid yarn by one-step method is realized.

In addition, through regulating and controlling the cooperative change of the speeds of the rear roller, the middle roller and the three front rollers, the fancy yarn with multiple structures such as single-twist coating, cross-twist coating, twining coating and the like is spun; the yarn is spun into a combined fancy yarn with changeable appearance and shape by regulating and controlling the speeds of the rear roller, the middle roller and the three front rollers to cooperatively change, on-line changing the combination of the decorative yarn and the core yarn, on-line changing the combination of the patterns such as knots, braids, loops and the like, on-line changing the sizes of the patterns such as knots, braids, loops and the like, on-line changing the colors of the patterns such as knots, braids, loops and the like; finally, the coating ratio of the core wire, the decorative wire and the fixed wire is regulated and controlled by regulating and controlling the speeds of the rear roller, the middle roller and the three front rollers in a cooperative mode, the color fancy yarn with online color change is spun, and the production efficiency is greatly improved.

In addition, the invention also discloses a fancy yarn forming method adopting the double-channel hollow spindle fancy yarn forming device.

The hollow spindle spinning device consists of a drawing channel of one roving, a core yarn channel of two short fiber yarns (or filaments) and a cladding yarn channel. The roving is subjected to alternating drafting to form untwisted strands with variable thickness, the untwisted strands are output by a drafting channel and are converged with yarns (or filaments) output by other two core yarn channels at a first twisting point, and under the action of twisting effect, three strands complete alternating twisting and form a fancy yarn main body; the yarn (or filament) is wrapped and twisted with the main body of the formed fancy yarn at the second twisting point due to the twisting effect of the hollow spindle, so that the fancy yarn comprising the decorative yarn, the core yarn and the solid yarn is formed, and the hollow spindle fancy yarn is spun by the decorative yarn, the core yarn and the solid yarn in one-step method.

Further, through online regulation and control of the speeds of the rear roller, the middle roller and the three front rollers, single-twist cladding structure fancy yarns, cross-twist cladding structure fancy yarns and twining cladding structure fancy yarns can be spun respectively by synergizing with input decorative yarns and core yarns;

The untwisted yarn strip or yarn is twisted at the first twisting point through the first channel, the first auxiliary channel or the second auxiliary channel, and is covered by the solid yarn at the second twisting point to form the single-twist cladding structure fancy yarn;

Two untwisted strands or yarns are respectively led into the cross-twisting triangular area through two channels in the first channel, the first auxiliary channel or the second auxiliary channel, and are covered by a solid yarn at a second twisting point after being twisted at a non-constant speed at the first twisting point to form a cross-twisting cladding structure fancy yarn;

Three untwisted strands or yarns are respectively led into the alternating twisting triangular area through the first channel, the first auxiliary channel and the second auxiliary channel, and are subjected to non-constant-speed twisting at the first twisting point, and then are covered by the solid yarn at the second twisting point to form the twisting cladding structure fancy yarn.

Further, the speeds of the first front roller, the second front roller and the third front roller are respectively、/>And/>By on-line regulation/control、/>And/or/>; The on-line change of the pattern combination modes of the decorative yarn and the core yarn, the on-line change of the pattern combination modes of knots, braids, loops and the like, the on-line change of the pattern sizes of knots, braids, loops and the like, the on-line change of the pattern colors of knots, braids, loops and the like, and the spinning of the combined fancy yarn with changeable appearance forms can be realized by regulating and controlling the speeds of the rear roller, the middle roller and the three front rollers on line.

Further, the first component yarn, the second component yarn and the third component yarn are respectively led into the alternating twisting triangular region by a first front roller, a second front roller and a third front roller, wherein the component yarn with the lowest front roller speed is core yarn of fancy yarn, the component yarn with higher front roller speed is decorative yarn of fancy yarn, and the online change of the combination mode of the decorative yarn and the core yarn in the fancy yarn is realized by online adjustment of the speeds of the first front roller, the second front roller and the third front roller.

Further, the spinning step of the fancy yarn with the combination of the flowers such as knots, braids, loops and the like changed in the loop comprises the following steps:

① When (when) When the first component yarn (yarn/>) The second component yarn and the third component yarn (core yarn/>) Forming a knot on the upper part;

When (when) When the first component yarn (yarn/>) The second component yarn and the third component yarn (core yarn/>) Forming a ring on the upper part;

② When (when) When the second component yarn and the third component yarn (yarn for decoration/>) The first component yarn (core yarn/>) Forming a knot on the upper part;

When (when) When the second component yarn and the third component yarn (yarn for decoration/>) The first component yarn (core yarn/>) Forming a braid or a ring on the upper part;

③ When (when) When the yarn of the third component (yarn for decoration/>) The first component yarn and the second component yarn (core yarn/>) Forming a knot on the upper part;

When (when) When the yarn of the third component (yarn for decoration/>) The first component yarn and the second component yarn (core yarn/>) Forming a braid or a ring on the upper part;

④ When (when) When the first component yarn and the second component yarn (decorative yarn/>) Inter-twist and kink in the third component yarn (core yarn/>) Forming a knot on the upper part;

When (when) When the first component yarn and the second component yarn (decorative yarn/>) Inter-twist and kink in the third component yarn (core yarn/>) Forming a braid or a ring on the upper part;

⑤ When (when) When the first component yarn and the third component yarn (yarn for decoration/>) The second component yarn (core yarn/>) Forming a knot on the upper part;

When (when) When the first component yarn and the third component yarn (yarn for decoration/>) The second component yarn (core yarn/>) Forming a braid or a ring on the upper part;

⑥ When (when) When the yarn is twisted, the second component yarn is twisted and knotted alternately to form knots on the first component yarn and the third component yarn;

When (when) When the yarn is twisted, the second component yarn is twisted and twined alternately to form a braid or loop on the first component yarn and the third component yarn.

Further, the spinning step of the double-loop fancy yarn includes:

When (when) In the case of the yarn, the second component yarn and the third component yarn are decorative yarns (decorative yarns/>)) The first component yarn is core yarn; the second component yarn and the third component yarn are low-twist yarns with a twist coefficient lower than 320, the second component yarn is alternately twisted and kinked on the first component yarn to form a first loop, and the third component yarn is alternately twisted and kinked on the first component yarn to form a second loop, so that a double-loop fancy yarn is formed;

Second component yarn and third component yarn (decorative line 、/>) The second component yarn and the third component yarn are respectively twisted and kinked on the first component yarn to form symmetrical double-loop fancy yarns; otherwise, the second component yarn and the third component yarn are respectively twisted and kinked on the first component yarn to form asymmetric double-loop fancy yarns;

Namely, a second component yarn and a third component yarn (decorative line 、/>) The linear density is not equal, the twist is equal, or the second component yarn and the third component yarn (ornamental thread/>、/>) Equal linear density, unequal twist, or a second component yarn and a third component yarn (decorative yarn、/>) The yarn has different linear density and twist, and forms asymmetric double-loop fancy yarn on the first component yarn.

Further, the spinning step of the double braid pattern yarn includes:

In the case of the yarn, the second component yarn and the third component yarn are decorative yarns (decorative yarns/>) ) First component yarn (core yarn/>) Is a core yarn; the second component yarn and the third component yarn are strong twist yarns with twist coefficients higher than 480, the second component yarn is alternately twisted and kinked on the first component yarn to form a first braid, and the third component yarn is alternately twisted and kinked on the first component yarn to form a second braid, so that a double-braid fancy yarn is formed;

the densities and the twists of the second component yarn and the third component yarn are equal to each other, so that symmetrical double plait fancy yarns are formed; the second component yarn and the third component yarn have unequal densities or twists, so that asymmetric double-braid fancy yarns are formed.

If the decorative line、/>The linear density and the twist are equal, so that symmetrical double braid fancy yarns are formed; if the decorative line/>、/>The linear density is unequal, the twist is equal, or the ornamental thread/>、/>Equal linear density, unequal twist, or trim/>、/>The asymmetric double plait fancy yarn can be formed by the unequal linear density and the unequal twist.

Further, the spinning step of the fancy yarn with the flower shape size changed in the coil, such as knots, braids, coils and the like, comprises the following steps:

the size of the flower-shaped yarn knots, braids, loops and the like depends on the thickness and twist of the decorative yarn and the core yarn, and the overfeeding speed of the decorative yarn relative to the core yarn. When the knots are formed, the knots formed by twisting the fancy yarn with large coarse twist and the fancy yarn with small fine twist are larger; when the loop is formed, the loop formed by twisting the fancy yarn with large thick twist and large overfeeding ratio of the decorative yarn is larger than the fancy yarn with small thin twist and small feeding ratio of the decorative yarn; when the braid is formed, the braided braid formed by twisting the fancy yarn with large thick twist and large overfeeding ratio of the fancy yarn is longer than the fancy yarn with small thin twist and small feeding ratio of the fancy yarn;

① Regulation and control of fancy yarn knot size

When (when)When the yarn is used, the first component yarn is a decorative yarn, and the second component yarn and the third component yarn are core yarns; first component yarn (yarn/>) The second component yarn and the third component yarn are alternately twisted and twined to form a core yarn (core yarn/>) Forming a knot on the upper part; the yarn density of the yarn at this time is:

speed of rear roller regulated by PLC The change of the linear density of the decorative yarn can be regulated, when the feeding speed of the rear roller is increased, the density of the decorative yarn is increased, and when the feeding speed of the rear roller is reduced, the linear density of the decorative yarn is reduced. Thereby regulating and controlling the online change of the size of the formed fancy yarn knots;

② Control of fancy yarn loop size

When (when)When the yarn is used, the first component yarn is a decorative yarn, and the second component yarn and the third component yarn are core yarns; first component yarn (yarn/>) The second component yarn and the third component yarn are alternately twisted and twined to form a core yarn (core yarn/>) Forming a ring on the upper part; the yarn density of the yarn at this time is:

by regulating and controlling the speed of the rear roller The change of the linear density of the decorative yarn can be regulated and controlled, when the feeding speed of the rear roller is increased, the density of the decorative yarn is increased, and when the feeding speed of the rear roller is reduced, the linear density of the decorative yarn is reduced;

simultaneously, the speed difference of the first front roller relative to the second front roller and the third front roller is regulated and controlled, and the yarn decorating speed is regulated and controlled Relative core yarn/>Overfeeding quantity of linear speed, under the looping condition, the loop is large when the overfeeding quantity of the decorative yarn is thick, and the loop is small when the overfeeding quantity of the decorative yarn is thin, so that the size of the formed fancy yarn loop is regulated to be changed on line;

③ Control of thickness of fancy yarn braid

When (when)When the yarn is a core yarn, the yarn is a decorative yarn; the second component yarn and the third component yarn are strong twist yarns (the twist coefficient is not less than 480), and the second component yarn and the third component yarn are immediately twisted on the first component yarn under the action of self-twisting stress to form braids;

The second component yarn and the third component yarn are set as the decorative yarn with the linear density of At this time, the speeds of the second component yarn and the third component yarn are regulated and controlledRelative to the first component yarn speed/>The overfeed amount of (2) is large, the braid is long, and the overfeed amount is small, so that the length of the formed fancy yarn braid is regulated and controlled to change on line.

Further, the spinning step of the fancy yarn with the cladding ratio and the linear density being changed in line comprises the following steps:

the first component yarn, the second component yarn, the third component yarn and the solid yarn are yarns with different colors, and the online change of the colors of the fancy yarns is realized by online adjustment of the wrapping structure, the wrapping proportion and/or the linear density of the fancy yarns.

The fancy yarn is formed by mutually wrapping core yarn, decorative yarn and fixed yarn, and when the wrapping structure and the wrapping proportion are changed on line, the color of the fancy yarn can be changed on line. According to formulas (6) (7) (8) (9) (10), if four sliver is fed in two twisting processesThe colors of red, yellow, blue, black and the like are respectively adopted, so that the color of the fancy yarn can be regulated and controlled by changing the coating ratio. Let the linear density of fancy yarn be/>The coating ratio of the fancy yarn is/>. Then

(4)

(5)

(6)

(7)

(8)

The servo motor is regulated and controlled and driven by the PLC、/>The on-line change of the density and the coating ratio of the fancy yarn can be regulated and controlled.

The following explains the structural parameters of the forming fancy yarn of the alternating draft twisting coating hollow spindle spinning system.

The linear density of the first component yarn (roving) used as the decorative yarn, the density of the second component yarn (i.e. the core yarn 1) and the density of the third component yarn and the density of the solid yarn are respectivelyAfter alternating drafting, alternating twisting and yarn fixing coating, the linear density of the fancy yarn is/>Setting three front roller speeds, back roller speed, middle roller speed and core wire feeding speeds of the first drawing roller and the second drawing roller in spinning process as/>, respectively、、/>C=1.25 is the speed ratio of the rear roller in each channel. After alternating drafting, alternating twisting and coating of the yarn fixing of the yarn core yarn, the formed fancy yarn has the following structural parameters:

1. Line density of decorative yarn

(1)

2. Linear density of core yarn:

(2)

3. Linear density of the solid yarn:

(3)

4. Yarn density and coating ratio of fancy yarn

(4)

(5)

(6)

(7)

(8)

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a hollow spindle fancy yarn forming device provided in embodiment 1 of the present invention;

fig. 2 is a schematic view of first to third channels of the hollow spindle fancy yarn forming apparatus in example 1;

FIG. 3 is a transmission structure diagram of a hollow spindle fancy yarn forming device provided in embodiment 1 of the present invention;

FIG. 4 is a schematic circuit diagram of a hollow yarn fancy yarn forming apparatus in example 1 of the present invention;

Fig. 5 is a circuit diagram showing a comparison module in the apparatus for forming a fancy yarn with hollow spindle in example 3 of the present invention.

Reference numerals:

y-first component yarn; x ₁ -a second component yarn; x ₃ -third component yarn; g ₁ -fixing yarn; r ₁ -a first drawing roller, R ₂ -a second drawing roller; r ₃ hollow spindle, D ₁ first twisting point; d ₂ -second twisting point; 41-a rear roller; 51-a first idler gear; 61-middle roller; 71-a first front roller; 72-a second front roller; 73-a third front roller; 4-a rear roller shaft; 5-an auxiliary shaft; 6-middle roller shaft; 7-a front roller shaft; 8-a second front axle; 11-a third front axle; 411-first drive gear; 611-a first driven gear; 82-second main gear, 721-second auxiliary gear, 113-third main gear, 731-third auxiliary gear, P ₄ -rear upper leather roller; p ₆ -middle epithelial roller; p ₇ -front epithelial roller; q ₁ -an upper apron; q ₂ -lower apron.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

As shown in FIGS. 1-3, the dual-channel hollow spindle fancy yarn forming device provided in this embodiment comprises a first channel ABC ₁D₁D₂ E for passing a first component yarn Y and a second component yarnA first auxiliary passage R ₁C₂D₁D₂ E for the third component yarn/>A second auxiliary channel R ₂C₃D₁D₂ E therethrough; the first channel is provided with a rear roller 41, a middle roller 61, a first front roller 71, a first twisting point D ₁ and a second twisting point D ₂ in sequence; the first auxiliary channel is provided with a second front roller 72, a first twisting point D ₁, and a second twisting point D ₂ in this order. The second auxiliary channel is provided with a third front roller 73, a first twisting point D ₁, and a second twisting point D ₂ in this order. The third front roller 73 and the second front roller 72 are rotatably provided relative to each other in the circumferential direction.

The area between the rear roller 41, the middle roller 61 and the first front roller 71 on the first channel is a drafting area, and an alternate twisting triangle area is formed among the first front roller 71, the second front roller 72, the third front roller 73 and the first twisting point; the first front roller, the second front roller and the third front roller respectively and independently move, and respectively introduce corresponding component yarns into an interactive twisting triangle; the first component yarn and the second component yarn are led to the alternating twisting triangular area and twisted to form the fancy yarn main body. The second twisting point D ₂ is provided with a hollow spindle R ₃, the fancy yarn main body passes through the hollow spindle R ₃, the hollow spindle R ₃ rotates rapidly, and the fixed yarn on the hollow spindle R ₃ is intersected with the fancy yarn main body and coats the fancy yarn main body.

The embodiment also comprises a filament bobbin (not shown), wherein the filament bobbin is sleeved on the hollow spindle and synchronously rotates along with the hollow spindle, and the yarn is wound on the filament bobbin. The hollow spindle includes a false twister (not shown) for twisting the fancy yarn body.

Wherein the rear roller 41 and the middle roller 61 are connected through a first transmission gear set, and the first transmission gear set is used for keeping the traction ratio between the middle roller 61 and the rear roller 41 constant and not more than 1.4.

The middle roller 61 and the rear roller 41 form a first-stage drafting unit, the front roller and the middle roller 61 form a second-stage drafting unit, the speed ratio of the middle roller 41 and the rear roller 41 in the same channel is constant and smaller than 1.4, the speed ratio is synchronously changed relative to the front roller in the channel, and the speed ratio of the middle roller 41 and the rear roller 41 in different channels is alternately changed relative to the front roller, so that alternating drafting of the first component yarn is realized. Of particular importance, the first draft is pre-draft, the first draft ratioDraft ratio of first-order draft with constant C being constant draftThe continuity of the roving can be ensured, and no drafting singular point is generated in the first drafting zone. Meanwhile, the fiber in the roving can be straightened, tensioned and oriented in the pre-drafting process, so that the preparation of sliding in the main drafting process is finished, the breakage rate or the singular point rate in the main drafting process is reduced, the drafting and twisting process is more stable, and the labor intensity of workers is greatly reduced.

The first auxiliary channel further comprises a first drawing roller R ₁ (a first unwinding shaft), and the first drawing roller, the second front roller 72, the first twisting point and the second twisting point are sequentially arranged; the second auxiliary channel further includes a second drawing roller R ₂ (second unwinding shaft), and the second drawing roller, the third front roller 73, the first twisting point, and the second twisting point are sequentially disposed.

The rear roller, the middle roller and the front roller are respectively provided with a rear upper leather roller P ₄, a middle upper leather roller P ₆ and a front upper leather roller P ₇. An upper leather roller P ₆ is correspondingly arranged above the middle roller 61, and the yarn forming device also comprises an upper leather collar Q ₁ sleeved on the upper pin and the middle leather roller and keeping synchronous movement with the middle roller 61, and a lower leather collar Q ₂ sleeved on the lower pin and the middle roller 61 and keeping synchronous movement with the middle roller 61; the distance between the holding jaws of the upper leather collar and the lower leather collar and the jaw line of the front roller is less than 3mm.

Two-stage draftingFor dynamic main drawing, the speed of the middle roller 61 is changed relative to the front roller, when the blending ratio k=0% of the first component yarn in the first channel, the channel yarn forms a drawing singular point in the second drawing zone when the second drawing ratio e _q = infinity of the channel yarn, the distance delta between the drawing singular point and the jaw of the front roller is less than or equal to 3mm (the distance delta between the rear roller 41 and the middle roller 61 in the prior art is generally greater than 25mm, the drawing singular point positions in the first drawing zone are randomly distributed between the middle roller 41 and the rear roller 41, when the drawing singular point is more than 3mm away from the jaw of the middle roller 61, the time for the drawing singular point to be fed into the jaw of the middle roller 61 again has an uncertain factor, if the matching is poor, or coarse detail is generated, or spinning breakage is caused, the spinning becomes an unstable process, and the reliability and the yarn forming quality of spinning are affected. When/>When the spinning machine is gradually increased, along with synchronous starting of the rear roller 41 and the middle roller 61, the fiber strips held by the upper leather collar and the lower leather collar are instantaneously fed into the jaw of the front roller to carry out secondary drafting, so that the drafting singular point positioned in the secondary drafting zone does not influence the spinning stability.

The embodiment also comprises a rear roller shaft 4, a middle roller shaft 6, a front roller shaft 7 and an auxiliary shaft 5; the rear roller 41 is rotatably journaled (e.g., by means of bearings) on the rear roller shaft 4 in the circumferential direction of the rear roller shaft 4; in the circumferential direction of the middle roller shaft 6, the middle roller 61 is movably sleeved on the middle roller shaft 6 in a relatively rotatable manner; the first transmission gear set comprises a first driving gear 411, a first carrier gear 51 and a first driven gear 611 which are sequentially meshed for transmission; the first driving gear is fixedly connected with the rear roller 41 in a coaxial center, and the first driven gear is fixedly connected with the middle roller 61 in a coaxial center; the first carrier gear 51 is mounted on the auxiliary shaft 5 in a relatively fixed manner. Thus, the back roller 41 and the middle roller 61 can be synchronously driven to operate by the auxiliary shaft 5, and the feeding speed of the first component yarn can be adjusted.

The first front roller 71 is sleeved on the front roller shaft 7 relatively fixedly in the circumferential direction of the front roller shaft 7; the second front roller 72 and the third front roller 73 are rotatably mounted on the front roller shaft 7.

The device also comprises a second front shaft 8 and a third front shaft 11, wherein the second front shaft 8 is connected with a second front roller 72 through a second gear transmission pair; the third front axle 11 is connected with a third front roller 73 through a third gear transmission pair; the second front roller and the third front roller can be respectively driven to rotate by the second front shaft and the third front shaft.

The second gear transmission pair includes: a second main gear 82 and a second auxiliary gear 721 which are meshed with each other for transmission, wherein the second main gear is fixedly sleeved on the second front shaft 8, and the second auxiliary gear is fixedly connected with the second front roller 72 in a coaxial manner; the third gear pair includes: the third main gear 113 and the third auxiliary gear 731 are meshed with each other, the third main gear is fixedly sleeved on the third front axle 11, and the third auxiliary gear 731 is fixedly connected with the third front roller 73 in a coaxial center.

Referring to fig. 4, the present embodiment further includes a control system and a servo drive system; the servo driving system comprises a servo driver and a servo motor; the control system comprises a controller (preferably a PLC programmable controller) and a rotating speed sensor; the controller is connected with the servo motor through a servo driver in sequence;

the servo motor includes: the hollow spindle comprises a first servo motor for driving a front roller shaft, a second servo motor for driving a second front shaft, a third servo motor for driving an auxiliary shaft to rotate, a fourth servo motor for driving a first drawing roller to rotate, a fifth servo motor for driving the first drawing roller to rotate, a sixth servo motor for driving the third front shaft and a hollow spindle motor for driving a hollow spindle to rotate.

The controller in the invention sequentially controls the feeding speeds of the four component yarns on the four yarn channels through the servo driver and the servo motor, the rotating speed sensor monitors the actual feeding speeds of the four component yarns in real time, the monitoring value is fed back to the controller, and the controller can adjust the magnitude of control signals on the four yarn channels according to the monitoring value. The twisting mechanism comprises a ring plate, and the controller controls the ring plate to move through a servo driver and a servo motor. In addition, the control system includes a series of instructions and a modular program.

According to the double-channel hollow spindle fancy yarn forming device provided by the invention, through constructing a hollow spindle spinning system with two paths of spinning channels and two twisting points, the first twisting point is subjected to alternate twisting and forms a fancy yarn main body, the second twisting point is subjected to cladding twisting by the output solid yarn and the formed fancy yarn main body, so that the fancy yarn comprising the decorative yarn, the core yarn and the solid yarn is formed, and the spinning of the decorative yarn, the core yarn and the solid yarn hollow spindle fancy yarn by a one-step method is realized.

Example 2

The embodiment also discloses a fancy yarn forming method adopting the double-channel hollow spindle fancy yarn forming device.

1. Spinning of hollow spindle fancy yarn formed by twisting decorative thread, core thread and fixed thread in one step

The hollow spindle spinning device consists of a drawing channel of one roving, a core yarn channel of two short fiber yarns (or filaments) and a cladding yarn channel. The roving is subjected to alternating drafting to form untwisted strands with variable thickness, the untwisted strands are output by a drafting channel and are converged with yarns (or filaments) output by other two core yarn channels at a first twisting point, and under the action of a twisting effect of a hollow spindle, three strands are subjected to alternating twisting and form a fancy yarn main body; the yarn (or filament) is wrapped and twisted with the main body of the formed fancy yarn at the second twisting point due to the twisting effect of the hollow spindle, so that the fancy yarn comprising the decorative yarn, the core yarn and the solid yarn is formed, and the hollow spindle fancy yarn is spun by the decorative yarn, the core yarn and the solid yarn in one-step method.

2. Spinning of fancy yarn with online changing wrapping structure

The speeds of the rear roller, the middle roller and the three front rollers can be regulated and controlled on line, so that the single-twist cladding structure fancy yarn, the cross-twist cladding structure fancy yarn and the twining cladding structure fancy yarn can be spun respectively by synergically inputting the decorative yarn and the core yarn;

⑴ Spinning of the fancy yarn with the cross-twisting cladding structure:

The twisting cladding structure of the effect yarn is a structure of the effect yarn formed by twisting two non-twisted strands (or yarns) at a constant speed at a first twisting point and cladding the two non-twisted strands with a solid yarn at a second twisting point.

In the device of the invention, the first channel (main channel), the first auxiliary channel and the second auxiliary channel respectively correspond to the first front roller, the second front roller and the third front roller, and the roving is used forAfter alternating drafting through the main channel, the yarn is output by a first front rollerOutput from the second front roller through the first auxiliary channel, yarn/>And is output from the third front roller through the second auxiliary channel. Roving yarnThe sliver output under the condition of alternating drafting is intermittent, when the linear density of the sliver output by the main channel is zero, two front rollers corresponding to the two auxiliary channels output two slivers at constant speed to twist at a first twisting point, and the yarn is fixed at a second twisting point by a fixed line/>, which is output by the yarn fixing channelCladding to form a fancy yarn structure with the cross-twisted cladding. For example, can be formed in this wayFancy yarn of the cross-twisted cladding structure.

⑵ Spinning of the twisting cladding structure fancy yarn:

the twist coating structure of the effect yarn is a structure of effect yarn in which three or more non-twisted strands (or yarns) are non-uniformly twisted at a first twisting point and are coated with a solid yarn at a second twisting point.

In the device of the invention, the first channel, the first auxiliary channel and the second auxiliary channel correspond to the first front roller, the second front roller and the third front roller, and the roving is used forAfter alternating drafting through the main channel, the yarn is output by a first front roller、/>The two yarns (or filaments)/>, at the first twisting point, are output at constant speed through a second front roller and a third front roller corresponding to the first auxiliary channel and the second auxiliary channelWith an untwisted yarn (roving/>)) Non-constant velocity twisting is carried out to form a twisting structure, and the yarn fixing/>, which is output by the yarn fixing channel, is carried out at the second twisting pointThe wrapping forms a twisting wrapped fancy yarn structure. Can be formed in this wayIs wrapped around the fancy yarn of the wrapping structure.

3. Spinning of fancy yarn with on-line changing morphology

The speeds of the first front roller, the second front roller and the third front roller are respectively、/>And/>By on-line regulation/control、/>And/or/>; The on-line change of the pattern combination modes of the decorative yarn and the core yarn, the on-line change of the pattern combination modes of knots, braids, loops and the like, the on-line change of the pattern sizes of knots, braids, loops and the like, the on-line change of the pattern colors of knots, braids, loops and the like, and the spinning of the combined fancy yarn with changeable appearance forms can be realized by regulating and controlling the speeds of the rear roller, the middle roller and the three front rollers on line.

⑴ Fancy yarn spinning with online changing decorative yarn and core yarn combined mode

The first component yarn, the second component yarn and the third component yarn are respectively led into the alternating twisting triangular region by a first front roller, a second front roller and a third front roller, wherein the component yarn (whisker strip) with the lowest front roller speed is core yarn of fancy yarn, the component yarn with the higher front roller speed is decorative yarn of fancy yarn, and the online change of the combination mode of the decorative yarn and the core yarn in the fancy yarn is realized by online adjusting the speeds of the first front roller, the second front roller and the third front roller.

Wherein the first component yarn (roving) After alternating drafting through the first channel, the first front roller is used for/>Output, second component yarn and third component yarn (yarn/>) From the second front roller and the third front rollerIs provided.

The strands with the lowest speed generally become the core yarn of the fancy yarn, and the strands with relatively higher speed become the ornamental yarn of the fancy yarn. When (when)Minimum time,/>、/>Is a core yarn,/>Is a decorative yarn; when/>Minimum time,/>Is a core yarn,/>、/>Is a decorative yarn. Thus, by PLC control/>The on-line change of the combination mode of the decorative yarn and the core yarn can be realized.

⑵ Spinning of fancy yarn with combined online variation of patterns such as knots, braids, loops and the like

① When (when)When the first component yarn (yarn/>) The second component yarn and the third component yarn (core yarn/>) Forming a knot on the upper part;

③ When (when) When the yarn of the third component (yarn for decoration/>) The first component yarn and the second component yarn (core yarn/>) Forming a knot on the upper part; /(I)

When (when)When the yarn of the third component (yarn for decoration/>) The first component yarn and the second component yarn (core yarn/>) Forming a braid or a ring on the upper part;

⑶ Spinning of double-loop fancy yarn

When (when)In the case of the yarn, the second component yarn and the third component yarn are decorative yarns (decorative yarns/>)) The first component yarn is core yarn; the second component yarn and the third component yarn are low-twist yarns with a twist coefficient lower than 320, the second component yarn is alternately twisted and kinked on the first component yarn to form a first loop, and the third component yarn is alternately twisted and kinked on the first component yarn to form a second loop, so that a double-loop fancy yarn is formed;

⑷ Spinning of double plait fancy thread

In the case of the yarn, the second component yarn and the third component yarn are decorative yarns (decorative yarns/>)) First component yarn (core yarn/>) Is a core yarn; the second component yarn and the third component yarn are strong twist yarns with twist coefficients higher than 480, the second component yarn is alternately twisted and kinked on the first component yarn to form a first braid, and the third component yarn is alternately twisted and kinked on the first component yarn to form a second braid, so that a double-braid fancy yarn is formed;

If the decorative line、/>The linear density and the twist are equal, so that symmetrical double braid fancy yarns are formed; if the decorative line/>、/>The linear density is unequal, the twist is equal, or the ornamental thread/>、/>Equal linear density, unequal twist, or trim/>、/>The asymmetric double braid fancy yarns can be formed by the unequal linear density and the unequal twist;

⑸ Spinning of fancy yarn with yarn-like size changing in-line like knots, braids, loops, etc

The size of the flower-shaped yarn knots, braids, loops and the like depends on the thickness and twist of the decorative yarn and the core yarn, and the overfeeding speed of the decorative yarn relative to the core yarn. When the knots are formed, the knots formed by twisting the fancy yarn with large coarse twist and the fancy yarn with small fine twist are larger; when the loop is formed, the loop formed by twisting the fancy yarn with large thick twist and large overfeeding ratio of the decorative yarn is larger than the fancy yarn with small thin twist and small feeding ratio of the decorative yarn; when the braid is formed, the braided braid formed by twisting the fancy yarn with large thick twist and large overfeeding ratio is longer than the fancy yarn with small thin twist and small feeding ratio.

① Regulation and control of fancy yarn knot size

② Control of fancy yarn loop size

speed of rear roller regulated by PLC The change of the linear density of the decorative yarn can be regulated and controlled, when the feeding speed of the rear roller is increased, the density of the decorative yarn is increased, and when the feeding speed of the rear roller is reduced, the linear density of the decorative yarn is reduced;

③ Control of thickness of fancy yarn braid

3. Spinning of fancy yarn with on-line variation of coating ratio and linear density

(4)

(5)

(6)

(7)

(8)

Example 3

The present embodiment is basically the same in structure as embodiment 1, except that:

As shown in fig. 5, the control system further includes a first comparing module, where the first comparing module is connected to the third sensor, the fourth sensor, the fifth sensor and the controller, and the first comparing module is used to monitor a rotation speed ratio among the auxiliary shaft, the first drawing roller and the second drawing roller, and the controller regulates and controls the rotation speeds of the auxiliary shaft, the first drawing roller and the second drawing roller according to the numerical value fed back by the first comparing module, so as to regulate and control the blending ratio of the first component yarn, the second component yarn and the third component yarn.

In order to accurately and rapidly realize yarn blending ratio regulation and control, the invention directly regulates and controls according to the numerical value fed back by the first comparison module, even if the rotation speeds of the auxiliary shaft, the first extraction roller and the second extraction roller respectively exceed the set error range due to various error reasons, the production can be continued without additionally regulating the actual rotation speeds of the middle roller shaft 6 and the rear roller shaft 4 as long as the rotation speed ratio fed back by the first comparison module is ensured to be within the set error range. Compared with the prior art, the invention only needs to monitor one parameter, widens the control precision of the rotation speeds of the auxiliary shaft, the first extraction roller and the second extraction roller, increases the redundancy of system control, highlights the importance of the rotation speed ratio of the upper rollers of different channels, greatly reduces the processing workload of the controller, greatly improves the control precision of the blending ratio of the yarns, and avoids the shutdown or adjustment time in the production process, and the production efficiency of the equipment is improved by more than 30 percent.

The comparison module may be a prior art, may be an existing comparator or integrated comparison circuit, or may be a comparison module in the form of software in the controller CUP. The sensor is also in many forms, and can be, for example, a photoelectric encoder or a Hall rotation speed sensor.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The double-channel hollow spindle fancy yarn forming device is characterized by comprising a first channel for passing a first component yarn, a first auxiliary channel for passing a second component yarn and a second auxiliary channel for passing a third component yarn;

A hollow spindle is arranged at the second twisting point, the fancy yarn main body passes through the hollow spindle, the hollow spindle rotates rapidly, and the fixed yarn on the hollow spindle is intersected with the fancy yarn main body and coats the fancy yarn main body;

the rear roller and the middle roller are connected through a first transmission gear set, and the first transmission gear set is used for keeping the traction ratio between the middle roller and the rear roller constant and not more than 1.4;

An upper leather roller is correspondingly arranged above the middle roller, and the yarn forming device also comprises an upper leather ring sleeved on the middle upper leather roller and the upper pin and keeping synchronous movement with the middle roller, and a lower leather ring sleeved on the middle roller and the lower pin and keeping synchronous movement with the middle roller; the distance between the holding jaws of the upper leather collar and the lower leather collar and the jaw line of the front roller is less than 3mm;

the speeds of the first front roller, the second front roller and the third front roller are respectively 、/>And/>By on-line regulation/control、/>And/or/>; The method is characterized in that the speeds of a rear roller, a middle roller and three front rollers are regulated and controlled in a coil mode, so that the on-line change of the combination modes of the decorative yarn and the core yarn, the on-line change of the combination modes of knots, braids and loop patterns, the on-line change of the sizes of knots, braids and loop patterns, the on-line change of the colors of knots, braids and loop patterns and the spinning of the combination fancy yarn with changeable appearance forms are realized;

The spinning step of the fancy yarn with the online change of the flower type combination comprises the following steps:

① When (when) When the yarn is twisted, the first component yarn is twisted and knotted alternately to form knots on the second component yarn and the third component yarn;

When (when) When the yarn is twisted, the first component yarn is twisted and knotted alternately to form a loop on the second component yarn and the third component yarn;

② When (when) When the yarn is twisted, the second component yarn and the third component yarn are alternately twisted and kinked on the first component yarn to form knots;

When (when) When the yarn is twisted, the second component yarn and the third component yarn are alternately twisted and knotted on the first component yarn to form a braid or a loop;

③ When (when) When the yarn is twisted, the yarn is twisted and knotted alternately to form knots on the yarn of the first component and the yarn of the second component;

When (when) When the yarn is twisted, the third component yarn is twisted and knotted alternately on the first component yarn and the second component yarn to form a braid or a loop;

④ When (when) When the yarn is twisted, the first component yarn and the second component yarn are alternately twisted and kinked on the third component yarn to form knots;

When (when) When the yarn is twisted, the first component yarn and the second component yarn are alternately twisted and knotted on the third component yarn to form a braid or a loop;

⑤ When (when) When the yarn is twisted, the first component yarn and the third component yarn are alternately twisted and knotted on the second component yarn to form knots;

When (when) When the yarn is twisted, the first component yarn and the third component yarn are alternately twisted and knotted on the second component yarn to form a braid or a loop;

2. The apparatus according to claim 1, wherein the first auxiliary channel further comprises a first drawing roller, and the first drawing roller, the second front roller, the first twisting point and the second twisting point are sequentially arranged;

And/or the second auxiliary channel further comprises a second drawing roller, and the second drawing roller, the third front roller, the first twisting point and the second twisting point are sequentially arranged.

3. The hollow spindle fancy yarn forming device of claim 1 further comprising a back roller shaft, a middle roller shaft and an auxiliary shaft;

The rear roller is movably sleeved on the rear roller shaft in a relatively rotatable manner in the circumferential direction of the rear roller shaft; in the circumferential direction of the middle roller shaft, the middle roller is movably sleeved on the middle roller shaft in a relatively rotatable manner; the first transmission gear set comprises a first driving gear, a first bridging gear and a first driven gear which are sequentially meshed for transmission; the first driving gear is fixedly connected with the rear roller in a coaxial manner, and the first driven gear is fixedly connected with the middle roller in a coaxial manner; the first bridge gear is sleeved on the auxiliary shaft in a relatively fixed mode.

4. The hollow spindle yarn forming device as in claim 1 further comprising a front roller shaft; the first front roller is sleeved on the front roller shaft relatively fixedly in the circumferential direction of the front roller shaft; the second front roller and the third front roller are sleeved on the front roller shaft in a relatively rotatable manner.

5. The apparatus for forming a fancy yarn of a hollow spindle as claimed in claim 4 further comprising a second front axle and a third front axle, the second front axle being connected to the second front roller by a second gear pair; the third front shaft is connected with the third front roller through a third gear transmission pair; the second front roller and the third front roller can be respectively driven to rotate by the second front shaft and the third front shaft.

6. The hollow spindle yarn forming device of claim 5 wherein said second gear train pair comprises: the second main gear and the second auxiliary gear are meshed with each other for transmission, the second main gear is fixedly sleeved on the second front shaft, and the second auxiliary gear is fixedly connected with the second front roller in a coaxial mode;

7. A fancy yarn forming method using the double-channel hollow spindle fancy yarn forming device as claimed in any one of claims 1 to 6.

8. The fancy yarn forming method of claim 7 wherein the single twist clad structured fancy yarn, the cross twist clad structured fancy yarn and the twist clad structured fancy yarn can be spun respectively by controlling the speeds of the back roller, the middle roller and the three front rollers on line in cooperation with the input decorative yarn and the core yarn;

9. The fancy yarn forming method of claim 7 wherein the first component yarn, the second component yarn and the third component yarn are respectively led into the alternating twisting triangle area by a first front roller, a second front roller and a third front roller, wherein the component yarn with the lowest front roller speed is the core yarn of the fancy yarn, the component yarn with the higher front roller speed is the decorative yarn of the fancy yarn, and the online change of the combination mode of the decorative yarn and the core yarn in the fancy yarn is realized by online adjusting the speeds of the first front roller, the second front roller and the third front roller.

10. The fancy yarn forming method of claim 7 wherein the step of spinning the double loop fancy yarn includes:

When (when) The second component yarn and the third component yarn are decorative yarns, and the first component yarn is core yarn; the second component yarn and the third component yarn are low-twist yarns with a twist coefficient lower than 320, the second component yarn is alternately twisted and kinked on the first component yarn to form a first loop, and the third component yarn is alternately twisted and kinked on the first component yarn to form a second loop, so that a double-loop fancy yarn is formed;

the density and the twist of the second component yarn and the third component yarn are equal, and the second component yarn and the third component yarn are respectively twisted and kinked on the first component yarn to form symmetrical double-loop fancy yarns; otherwise, the second component yarn and the third component yarn are respectively twisted and kinked on the first component yarn to form an asymmetric double-loop fancy yarn.

11. The fancy yarn forming method of claim 7 wherein the step of spinning the double braid includes:

The second component yarn and the third component yarn are decorative yarns, and the first component yarn is core yarn; the second component yarn and the third component yarn are strong twist yarns with twist coefficients higher than 480, the second component yarn is alternately twisted and kinked on the first component yarn to form a first braid, and the third component yarn is alternately twisted and kinked on the first component yarn to form a second braid, so that a double-braid fancy yarn is formed;

12. The fancy yarn forming method of claim 7 wherein the step of spinning fancy yarn of which the pattern size varies on line includes:

The sizes of fancy yarn knots, braids and loop patterns depend on the thickness and twist of the decorative yarn and the core yarn, and the overfeeding speed of the decorative yarn relative to the core yarn; when the knots are formed, the knots formed by twisting the fancy yarn with large coarse twist and the fancy yarn with small fine twist are larger; when the loop is formed, the loop formed by twisting the fancy yarn with large thick twist and large overfeeding ratio of the decorative yarn is larger than the fancy yarn with small thin twist and small feeding ratio of the decorative yarn; when the braid is formed, the braided braid formed by twisting the fancy yarn with large thick twist and large overfeeding ratio of the fancy yarn is longer than the fancy yarn with small thin twist and small feeding ratio of the fancy yarn;

① Regulation and control of fancy yarn knot size

When (when)When the yarn is used, the first component yarn is a decorative yarn, and the second component yarn and the third component yarn are core yarns; the first component yarn is alternately twisted and kinked to form knots on the core yarn which is the second component yarn and the third component yarn; the yarn density of the yarn at this time is:

Is the linear density of the first component yarn;

the linear density of the decorative yarn;

The speed of the rear roller;

By regulating and controlling the speed of the rear roller The change of the linear density of the decorative yarn can be regulated, when the feeding speed of the rear roller is increased, the density of the decorative yarn is increased, and when the feeding speed of the rear roller is reduced, the linear density of the decorative yarn is reduced, so that the online change of the size of the formed fancy yarn knots is regulated;

② Control of fancy yarn loop size

When (when)When the yarn is used, the first component yarn is a decorative yarn, and the second component yarn and the third component yarn are core yarns; the first component yarn is alternately twisted and kinked on the second component yarn and the third component yarn to form a loop; the yarn density of the yarn at this time is:

Is the linear density of the first component yarn;

the linear density of the decorative yarn;

The speed of the rear roller;

Meanwhile, regulating and controlling the speed difference of the first front roller relative to the second front roller and the third front roller, further regulating and controlling the overfeeding amount of the decorative yarn speed relative to the core yarn speed, and regulating and controlling the online change of the size of the formed fancy yarn loop when the decorative yarn is thick and overfeeding amount is large and the decorative yarn is thin and overfeeding amount is small under the looping condition;

③ Control of thickness of fancy yarn braid

When (when)When the yarn is a core yarn, the yarn is a decorative yarn; the second component yarn and the third component yarn are strong twisting yarns, and the second component yarn and the third component yarn are immediately twisted on the first component yarn under the action of self-twisting stress to form braids;

The second component yarn and the third component yarn are respectively provided as the decorative yarn with the linear density of At this time, the second component yarn speed/>, is regulated and controlledAnd third component yarn speed/>Relative to the first component yarn speed/>The overfeed amount of (2) is large, the braid is long, and the overfeed amount is small, so that the length of the formed fancy yarn braid is regulated and controlled to change on line.

13. The fancy yarn forming method of claim 7 wherein the step of spinning the fancy yarn with a cladding ratio that varies in line with the linear density comprises: