JP2001073235A - Air spinning device and its piecing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate and ensure the introduction of fibers into a hollow guide shaft, when the piecing of the fibers are started, and enhance the probability in the success for discharging the spun yarn, in its turn, for piecing the fibers. SOLUTION: This method for piecing fibers comprises producing revolved air flows in the mutually opposite directions with pressurized air jetted from a spinning nozzle and a yarn-discharging nozzle, and using the produced revolved flows as follows. Therein, in the route for discharging the spun yarn from a hollow guide shaft, the air-jetting pressure of the spinning nozzle is controlled to a low pressure P1 for a prescribed time ΔT, and then switched into a high pressure PH. Thereby, the revolved air flow produced with the spinning nozzle is weakened to control the revolution of the fibers, thus facilitating the transmission of twists and further facilitating the first introduction of the fibers into the entrance of the hollow guide shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic spinning apparatus for performing spinning using a swirling flow by compressed air and a piecing method thereof.

[0002]

2. Description of the Related Art In general, in a pneumatic spinning device, compressed air is injected from a spinning nozzle at an inlet of a hollow guide shaft to generate a swirling flow, and the yarn is fed into the hollow guide shaft while being actually twisted. . At this time, the yarn is sandwiched between the nip roller and the delivery roller on the downstream side of the hollow guide shaft and sent to the downstream side. As a result, a feed force toward the downstream side is applied to the yarn, and the yarn is actually twisted and spun.

On the other hand, when a yarn break occurs, it is necessary to reconnect the yarn. Conventionally, the yarn end of the yarn already wound on the package side is passed through the hollow guide shaft body from the opposite side, carried to the tip of the nozzle portion, and piecing with the yarn on the draft side. For this reason, there were many mistakes in the pre-splicing preparation stage, and it was difficult to keep the piecing length constant.

Accordingly, the present applicant has proposed a yarn feeding nozzle for providing a swirling flow in the hollow guide shaft body in a direction opposite to the above-described swirling flow. According to this, at the time of splicing, while the yarn in the hollow guide shaft is spun into a binding fiber by a reverse swirling flow, a feed force toward the downstream side is given to the yarn (this is called self-spinning), and the yarn is spun. Can be discharged from the hollow guide shaft body in the forward direction. Therefore, it is easy to carry this by a suction pipe, sandwich it between the nip roller and the delivery roller, change the feed force and shift to normal real twist spinning, and bind this real twist yarn with the real twist yarn on the package side with a knotter. In addition, piecing can be suitably performed.

[0005] During self-spinning, the fiber is swung by the swirling flow of the spinning nozzle at the entrance of the hollow guide shaft, and the fiber is entangled with the already-formed binding yarn for spinning.

[0006]

By the way, at the start of splicing, it is necessary to introduce the first fiber into the entrance of the hollow guide shaft.

Conventionally, the injection pressure of the spinning nozzle has been high since the start of piecing, and a relatively strong swirling flow has been generated. For this reason, the fiber is swung excessively, it is difficult to transmit the twist, and it is difficult to introduce the fiber into the entrance of the hollow guide shaft. For this reason, the probability of successful piecing was reduced, and it was difficult to cope with various spinning nozzles.

[0008]

A pneumatic spinning apparatus according to the present invention injects compressed air at an inlet of a hollow guide shaft to generate a swirling flow, and injects compressed air into the hollow guide shaft. A spinning nozzle for generating a swirling flow in a direction opposite to the swirling flow, and switching means for switching the injection pressure of the spinning nozzle to a high pressure or a low pressure.

Here, it is preferable that the switching means switches the injection pressure to a low pressure for a predetermined time from the start of piecing.

Further, in the method for splicing a pneumatic spinning apparatus according to the present invention, swirling flows are generated in opposite directions by pressurized air jetted from a spinning nozzle and a yarn feeding nozzle. In the method of splicing a pneumatic spinning device having a yarn feeding process, the injection pressure of the spinning nozzle is set to a low pressure for a predetermined time from the start of the splicing, and then switched to a high pressure.

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 5, a pneumatic spinning apparatus 1 according to the present invention has a large number of spinning units 2 provided side by side, and a splicing device (splicing bogie) provided between the spinning units 2 so as to run freely. 3, a blower box 4 and a motor box 5.

As shown in FIGS. 6 and 7, each spinning unit 2 is provided on a casing 6 of the main body of the spinning device 1, and a draft portion 7 provided near an upper end of the casing 6 is provided.
A spinning unit 9 provided downstream of the draft unit 7 in the spinning direction to spin the fiber bundle 8 sent from the draft unit 7;
A yarn feeder 11 provided downstream of the spinning unit 9 for feeding the spun yarn 10 and a suction unit 50 provided downstream of the yarn feeder 11 and formed of a slack tube for sucking the spun yarn 10.
A yarn defect detecting unit 51 provided downstream of the suction unit 50 and configured of a yarn clearer for detecting a yarn defect of the spun yarn 10; and winding the spun yarn 10 provided downstream of the yarn defect detecting unit 51. And a take-up unit 12 for taking out.

As shown in FIG. 7, the draft part 7 is for drawing the sliver 13 into a fiber bundle 8.
Back roller 14, Third roller 15, Middle roller 17 on which apron belt 16 is mounted, and Front roller 1
8 rollers.

As shown in FIG. 2, the spinning section 9 includes a spinning nozzle section 19 for applying a swirling flow to the fiber bundle 8 sent from the front roller 18 for real twisting, and a spinning nozzle section 19 after the actual twisting. And a guide shaft portion 52 through which the thread is inserted. The guide shaft 52 is provided at the center thereof with the hollow guide shaft 2.
0 is provided.

The spinning nozzle 19 has a guide hole 21 for introducing the drafted fiber bundle 8, a needle holder 23 for holding a needle 22 on the flow path of the fiber bundle 8 discharged from the guide hole 21, A swirling flow generating unit 25 that is in close contact with the downstream side of the holder 23 and covers a distal end portion 24 of a hollow guide shaft body 20 described later with a predetermined interval, and generates a swirling flow near the distal end of the hollow guide shaft body 20. Consists of

The swirling flow generating section 25 is formed in a tapered cylindrical shape, and is assembled concentrically with the needle holder 23. Inside the swirl flow generating unit 25,
A spinning chamber 26 for applying a swirling flow to the fiber bundle 8 sent from the needle holder 23 is formed.
The distal end portion 24 of the hollow guide shaft body 20 is accommodated coaxially in the inside 6.

The swirling flow generating section 25 is provided with a plurality of spinning nozzles 27 for generating a swirling flow at the entrance of the hollow guide shaft 20. The spinning nozzle 27 is a thin hole connected to the inside of the spinning chamber 26 from the radial direction outside of the swirling flow generating unit 25, and counterclockwise as viewed in the yarn traveling direction along the inner circumference of the swirling flow generating unit 25. (Counterclockwise, Fig. 3
(Refer to FIG. 2) so as to flow in the direction 48 and incline on the tangent to the spinning chamber 26 and on the downstream side in the feed direction of the fiber bundle 8. From these spinning nozzles 27, compressed air (pressurized air) is selectively injected.

The hollow guide shaft body 20 has a distal end 24 formed in a tapered cylindrical shape with a tapered end, and has a thread passage 29 on the axis thereof. It is arranged toward 22. Hollow guide shaft 2
0 is preferably non-rotatable, but may be rotatable.

The yarn passage 29 is formed so as to expand toward the yarn discharge side. Specifically, the yarn passage 29 is formed by increasing the diameter in multiple stages, and has a small-diameter introduction portion 30 extending a predetermined length from the inlet 28 toward the discharge side, and a step on the downstream side of the introduction portion 30. A first enlarged portion 31 whose diameter is increased;
A second enlarged diameter portion 32 that is smoothly connected to the downstream side of the enlarged diameter portion 31 and is enlarged in a tapered shape; and a third enlarged diameter portion that is enlarged in a stepwise manner downstream of the second enlarged diameter portion 32. 33. An outlet 34 of the yarn passage 29 is formed at an end of the third enlarged diameter portion 33.

As shown in FIGS. 3 and 4, inside the hollow guide shaft 20, a plurality of yarn feeding nozzles 36 provided tangentially to the yarn passage 29 are provided. The yarn feeding nozzle 36 is formed of a small-diameter hole, and is clockwise (clockwise, see FIG. 3) as viewed in the yarn running direction along the inner periphery of the yarn passage 29.
Eight portions are connected to the first enlarged portion 31 at equal intervals so that air flows in the direction 49.

An air passage 37 is formed inside the hollow guide shaft body 20 and extends from the vicinity of the outlet 34 to the distal end side and communicates with each of the yarn feeding nozzles 36. Air passage 37
Is connected to the compressed air supply passage 38 on the outlet 34 side. Thus, compressed air is selectively ejected from the thread take-out nozzle 36.

As shown in FIG. 6 and FIG.
Is composed of a delivery roller 39 provided on the casing 6 of the spinning device 1 and a nip roller 40 provided so as to be freely accessible to the delivery roller 39. Then, the spun yarn 10 coming out of the hollow guide shaft 20 is delivered to the delivery roller 3.
9 between the nip roller 40 and the delivery roller 39
Is rotated to rotate the spun yarn 10 into the winding section 12.
It is sent to the side. As shown in FIG. 6, a dust collector 54 is provided below the outlet 34 of the hollow guide shaft 20. A suction force is always applied to this, so that fly waste and the like near the outlet 34 are removed by suction.

The piecing apparatus 3 includes a carriage 42 running on a rail 41 provided on the casing 6 of the spinning apparatus 1.
And a knotter (jet splicer) 43 provided on the trolley 42 and the spinning unit 9
And a suction pipe 44 for guiding the spun yarn 10 coming out of the hollow guide shaft body 20 to the notter 43 while sucking the spun yarn 10 and a package 45 rotatably provided on the carriage 42 and rotatably supported by the winding unit 12. And a suction mouth 46 for sucking the end and guiding it to the notter 43.

The spinning device 1 incorporates a control device (not shown), which generally controls the operation of each part described later.

Further, the spinning apparatus 1 is provided with a switching means for switching the injection pressure of the spinning nozzle 27 to a high pressure or a low pressure. Although not shown, the switching means includes an electromagnetic switching valve provided in the middle of a compressed air passage connecting the spinning nozzle 27 and the compressed air source, and the above-described control device for electrically switching the electromagnetic switching valve.

Next, a piecing method of the present apparatus will be described.

The splicing for starting the spinning device 1 and
When performing piecing by yarn breakage, the piecing device 3 is moved to the spinning unit 2 where piecing is to be performed, all the rollers of the draft unit 7 are activated (ON), and the spinning nozzle 27 and the yarn exit nozzle 36 are activated ( ON) to inject compressed air.

As shown in FIG. 1, at time T _{0 when the} piecing is started, the spinning nozzle 27, the yarn feeding nozzle 36, and the back roller 14 (B / R) of the draft unit 7 are turned on. In this case the switching means are switched in advance to the low pressure side, the spinning nozzle 27 for injecting compressed air at low pressure P _L.

In the draft section 7, the sliver 13 is drawn and sent out to the spinning section 9 as a fiber bundle 8. The fiber bundle 8 sent to the spinning unit 9 is inserted into the guide hole 21 of the needle holder 23.

The compressed air jetted from the spinning nozzle 27 flows in the feed direction of the fiber bundle 8 while turning. For this reason, the fiber bundle 8 inserted through the guide hole 21 of the needle holder 23 is loosely twisted by the swirling flow while being set in the hollow guide shaft 20.
Near the entrance 28.

The compressed air jetted from the yarn feeding nozzle 36 flows along the inner peripheral surface in the yarn passage 29 formed in the hollow guide shaft 20, and forms a swirling flow.

Since the yarn passage 29 is formed so as to expand toward the discharge side of the spun yarn 10, the compressed air injected into the yarn passage 29 from the yarn supply nozzle 36 is discharged from the outlet 34.
Flowing toward the side, the narrow inlet 30 and the inlet 28 are under negative pressure. For this reason, a suction force is generated at the entrance 28 of the hollow guide shaft 20, whereby the first fiber bundle 8 or the fibers can be captured and introduced into the entrance 28.
After the introduction, the fiber bundle 8 can be continuously drawn in.

The fiber bundle 8 reaches the first enlarged diameter portion 31 and is exposed to a swirling flow in the direction opposite to the spinning nozzle portion 19. For this reason, the fiber bundle 8 in a loose false twist state is spun as a binding fiber-like binding spun yarn 47 while the exit 34 of the hollow guide shaft body 20 is spun by a known spinning technique of producing a spun yarn by rotating nozzles in mutually opposite directions. Is discharged from At this time, a feed force toward the outlet 34 is given to the yarn by the swirling flow.

On the other hand, before the discharge, the suction pipe 44 of the piecing apparatus 3 is turned upward in advance (see the phantom line in FIG. 6).
The inlet of the suction tube 44 faces the outlet 34. Then, when the yarn end of the bundled spun yarn 47 is discharged from the outlet 34, the yarn end is sucked and captured by the suction tube 44, and the bundled spun yarn 47 is drawn into the suction tube 44. When the suction pipe 44 is turned downward in this state (see the solid line in FIG. 6), the bundled spun yarn 47 is guided to the knotter 43.

As shown in FIG. 1, after the suction into the suction pipe 44 is completed, the switching means is switched to the high pressure side, and the spinning nozzle 2
7 injects compressed air at high pressure P _H. Thus switching means switches the injection pressure from the time T ₀ at time T ₁ of the predetermined time after ΔT has elapsed from the low pressure to the high pressure.

When the injection pressure of the spinning nozzle 27 is reduced to zero between the time T ₀ and the time T ₁ ,
Is stopped, the yarn feeding nozzle 36 and the front roller 18
Since the distance from the nip point is longer than the average fiber length, twisting does not propagate only by winding the fiber from the outlet 34 of the hollow guide shaft 20, so that a low pressure P _L different from zero is required.

Further, by setting the spinning nozzle 27 to a low pressure P _L different from zero, a suction force acts on the inlet of the guide hole 21 of the spinning nozzle portion 19, thereby improving the success rate of piecing.

While the bound spun yarn 47 is being guided to the knotter 43, the bound spun yarn 47 is continuously rotated by the delivery roller 39.
And the nip roller 40 (time T _{2 in} FIG. 1),
After a predetermined time, the yarn feeding nozzle 36 is turned off. As a result, the feed force of the yarn feeding nozzle 36 is lost, and the feed force of the roller is given to the entire yarn on the upstream side of the roller, thereby converting the feed force. In this way, the spinning nozzle 27 and the hollow guide shaft 2
0, the process is shifted to the ordinary real twist spinning by the cooperative action of the delivery roller 39 and the nip roller 40.
After a while, all of the united spun yarn 47 is sucked into the suction pipe 44, and the real twisted spun yarn is transferred to the knotter 43. To produce normal true twist yarn, spinning nozzle 27, at the latest, it is necessary to switch to the high pressure P _H is until OFF the yarn discharging nozzle 36 starts true twist spinning.

At the same time as the delivery to the notter 43, the real twist spun yarn on the package 45 side is also delivered to the knotter 43 by the turning operation of the suction mouth 46.

When the real twisted spun yarns on the suction tube 44 side and the suction mouth 46 side are respectively passed to the knotter 43 in this way, the notter 43 is driven so as to tie both the real twisted spun yarns. Thereby, the piecing is completed, and only the real twist spun yarn is wound around the package 45.

As described above, in the present apparatus, the yarn feeding nozzle 36
Is provided, so that the yarn is fed forward at the time of piecing and the yarn passage outlet 3
4 can be discharged. As a result, the discharged yarn is sucked by the suction tube 44, and is sandwiched between the delivery roller 39 and the nip roller 40 by the turning operation of the suction tube 44. it can. Therefore, complicated preparation for backflow of the yarn into the hollow guide shaft body 20 which has been performed by the conventional device can be eliminated, and the yarn splicing can be easily and reliably performed.

At the time of the above-described yarn splicing, there is a process in which the yarn is spun from the hollow spindle 20 by the spinning nozzle 27 and the yarn spun nozzle 36. And in this process, the injection pressure of the spinning nozzles 27 from the yarn splicing starts with the low pressure P _L for a predetermined time [Delta] T, then is switched to the high pressure P _H.

In this manner, the first fiber can be easily introduced into the hollow guide shaft 20. That is, the spinning nozzle 27
By setting the injection pressure to a low pressure P _L , the swirling flow due to this is weakened, the swirling of the fiber is suppressed, the propagation of the twist is facilitated, and the first introduction of the fiber into the hollow guide shaft inlet 28 can be facilitated. In other words, a negative pressure is applied to the inlet 28 at the same time when the yarn feeding nozzle is turned on. By suppressing the swinging of the fiber, the fiber can be easily captured on the negative pressure, and the probability of successful yarn feeding increases. This increases the probability of successful piecing and improves reliability. In addition, the dependence on the spinning nozzle shape is reduced, that is, the effect of the spinning nozzle on the fiber introduction is reduced, and even if the spinning nozzle shape changes, there is almost no effect on the splicing success rate. Versatility increases.

As can be seen, the predetermined time ΔT
It is necessary to set a sufficient time so that the thread can be threaded reliably within that time.

[0046] Note that the conventional as shown in Fig. 1 phantom line, the injection pressure of the spinning nozzles 27 from the yarn piecing start was difficult the first fiber introduced at high pressure P _H. The present device is intended to solve this. Meanwhile, after the fiber introduction into the hollow guide shaft 20 since the normal return to the high pressure P _H, the yarn discharging by self spinning can be performed reliably conventional. In particular, if the fiber enters once and the twist is propagated, the fiber becomes thread-like and can be drawn into the hollow guide shaft 20, so that it is advantageous to increase the injection pressure.

As described above, various other embodiments of the present invention can be considered. Various configurations of the switching means are conceivable.

[0048]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) The fiber can be easily and reliably introduced into the hollow guide shaft at the start of the splicing.

(2) The probability of success in yarn feeding and splicing can be increased, and reliability can be improved.

(3) Various spinning nozzles can be used, and versatility is improved.

[Brief description of the drawings]

FIG. 1 is a time chart showing an operation state at the start of piecing.

FIG. 2 is a sectional view showing a main part of the spinning device.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a sectional view taken along line XX of FIG. 3;

FIG. 5 is a front view of the spinning device.

FIG. 6 is a vertical sectional side view of the spinning device.

FIG. 7 is a perspective view showing a configuration of a spinning unit.

[Explanation of symbols]

1 the pneumatic spinning device 20 the hollow guide shaft 27 spinning nozzle 28 inlet 29 yarn passage 36 yarn discharging nozzle P _H high P _L low T _1, T ₂ time ΔT predetermined time

Claims (3)

[Claims] 1. A spinning nozzle that injects compressed air at an inlet of a hollow guide shaft to generate a swirling flow, and injects compressed air in the hollow guide shaft to generate a swirling flow in a direction opposite to the swirling flow. An air spinning device, comprising: a yarn feeding nozzle; and switching means for switching an injection pressure of the spinning nozzle to a high pressure or a low pressure. 2. The pneumatic spinning device according to claim 1, wherein the switching means switches the injection pressure to a low pressure for a predetermined time from the start of the piecing. 3. A yarn of an air spinning device having a process in which swirling flows are generated in opposite directions by pressurized air injected from a spinning nozzle and a yarn discharging nozzle, and the yarn is discharged from a hollow guide shaft body by using the swirling flow. A splicing method for a pneumatic spinning device, characterized in that the jetting pressure of the spinning nozzle is set to a low pressure for a predetermined time from the start of the splicing, and then switched to a high pressure.