JP2001073237A - Spinning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the choking of a nozzle, the choking of a hollow guide shaft and the worn damage to a front roller, when a suction pipe misses to suck. SOLUTION: This spinning device 1 is provided with a draft portion 7, an air type spinning portion 9 disposed on the downstream side in the spinning direction, a suction pipe 44 for sucking and catching a yarn discharged from the exit 34 of the air type spinning portion 9, a yarn detection sensor 53 for detecting the presence or absence of the yarn in the suction pipe 44, and a control device for controlling the operations of a draft portion 7 and the air type spinning portion 9 on the basis of the detection results of the yarn detection sensor 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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, while the yarn in the hollow guide shaft body is spun into a binding fiber by a reverse swirling flow (this is referred to as self-spinning), a feed force toward the downstream side is given to the yarn, and the yarn is fed to the hollow guide shaft. It can be discharged in the forward direction from the shaft. 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]

By the way, in the above-mentioned piecing process, when the yarn coming out of the hollow guide shaft cannot be caught by the suction tube, or when the self-spun tying yarn has insufficient strength, it is sucked by the suction tube. If the yarn breaks at this time, the yarn coming out of the outlet of the hollow guide shaft is sucked by the lower dust collector with a relatively weak force without being sucked by the suction pipe.

In this case, the yarn is not caught between the nip roller and the delivery roller, and after a while, the yarn supply nozzle is also stopped, so that no feed force is applied to the yarn. On the other hand, since the fiber is continuously supplied in the draft portion, there is a problem that a choke occurs in the nozzle choke and the hollow guide shaft as a result.

[0007] Further, if the fiber is further supplied,
The fiber is steadily fed to the choking nozzle portion, and as a result, there is a problem that the front roller of the draft portion is worn and damaged. In particular, since the wear of the front roller greatly affects the yarn properties, improvement is essential.

[0008]

A spinning apparatus according to the present invention comprises a draft section, a pneumatic spinning section provided downstream of the draft section in the spinning direction, and suction and capture of a yarn emerging from an outlet of the pneumatic spinning section. A suction pipe, a yarn detection sensor for detecting the presence or absence of a yarn in the suction pipe, and a control device for controlling the operation of the draft section and the pneumatic spinning section based on the detection result of the yarn detection sensor. It is.

Here, the pneumatic spinning unit has two nozzles for generating swirling flows in opposite directions, and the control device determines a timing after completion of the suction and capture of the yarn by the suction tube at the time of splicing. In the above, when the yarn detection sensor detects that there is no yarn, it is preferable to stop the operation of the back roller of the draft portion and control the two nozzles to continue operating for a predetermined time.

It is preferable that the control device controls the two nozzles to continue operating at least until all the fibers remaining in the draft portion when the draft portion is stopped are discharged as a thread. .

Further, the spinning apparatus according to the present invention comprises a draft section, a hollow guide shaft provided downstream of the draft direction, a spinning nozzle for generating a swirling flow at an entrance of the hollow guide shaft, and a hollow section. A yarn exit nozzle which applies a swirling flow to the yarn in the yarn passage of the guide shaft body in a direction opposite to the swirl flow, and applies a feed force toward the yarn passage outlet to the yarn; and a yarn emerging from the yarn passage outlet Pipe, a yarn detection sensor that detects the presence or absence of a yarn in the suction pipe, and a control device that controls the operation of the draft unit, the spinning nozzle, and the yarn feeding nozzle based on the detection result of the yarn detection sensor. It is provided with.

[0012] The control device may be arranged so that at the timing after the completion of the suction and capture of the yarn by the suction tube at the time of splicing,
When the yarn detection sensor detects that there is no yarn, the operation of the back roller of the draft portion is stopped, and the spinning nozzle and the yarn feeding nozzle are continuously operated for a predetermined time.

[0013] The control device, at the timing after the completion of the suction and capture of the yarn by the suction tube at the time of splicing,
When the presence of a yarn is detected by the yarn detection sensor, the back roller and the spinning nozzle of the draft section are continuously operated, and the operation of the yarn feeding nozzle is stopped after a predetermined time has elapsed. At this time, if the yarn feeding nozzle is stopped at least before the piecing operation is performed at the piecing part of the piecing device, the tied spun yarn is not mixed into the yarn after the piecing is completed, and all the yarns are formed as real twist spun yarn Can be wound up.

[0014]

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

As shown in FIG. 6, a spinning apparatus 1 includes a large number of spinning units 2 provided side by side, and a splicing device (splicing cart) 3 provided between the spinning units 2 so as to be able to run freely.
, A blower box 4 and a motor box 5.

As shown in FIGS. 7 and 8, 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 feeding section 11 provided downstream of the spinning section 9 for feeding the spun yarn 10; a suction section 50 provided downstream of the yarn feeding section 11 and formed of a sluffing tube for sucking the spun yarn 10; A yarn defect detector 51 provided downstream of the yarn 50 and configured of a yarn clearer for detecting a yarn defect of the spun yarn 10, and a winding provided downstream of the yarn defect detector 51 for winding the spun yarn 10. And a taking part 12.

As shown in FIG. 8, the draft part 7 is for drawing the sliver 13 into the 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. 3, the spinning section 9 comprises 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 portion 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 portion 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. 4
(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 portion 24 formed in a tapered cylindrical shape having a tapered end, and has a yarn passage 29 on the axis, and an inlet 28 of the yarn passage 29 formed at the distal end is needled. It is arranged toward 22.

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. 4 and 5, 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. 4) 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. As described above, the swirling direction of the spinning nozzle 27 and the swirling direction of the yarn exit nozzle 36 are opposite to each other.

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. 7 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. 7, 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 bogie 42 running on a rail 41 provided on the casing 6 of the spinning apparatus 1.
And a knotter (jet splicer) 43 which is a yarn splicing part provided on the bogie 42, and a knotter while sucking the spun yarn 10 coming out of the hollow guide shaft body 20 of the spinning part 9 rotatably provided on the bogie 42. Suction tube 44 for guiding to 43
And a suction mouth 46 for sucking the yarn end from a package 45 rotatably provided on the carriage 42 and rotatably supported by the winding unit 12 and guiding the yarn end to the knotter 43.

The suction tube 44 is provided with a yarn detecting sensor 53 for detecting the presence or absence of a yarn in the tube.
Here, the yarn detection sensor 53 is constituted by an optical sensor.

A control device (not shown) is incorporated in the spinning device 1 and controls the operation of each part described later. In particular, this is the yarn detection sensor 5
The presence or absence of a thread in the suction pipe 44 is determined based on the detection result of (3).

In the draft section 7, the back roller 14
Is connected to a constantly rotating line shaft via a clutch (not shown) independently of the other rollers 15, 17, and 18. The engagement and disengagement of the clutch is performed by a fluid cylinder (not shown), and the operation of the fluid cylinder is controlled by the control device.

Next, the operation will be described.

First, the piecing operation of the present apparatus will be described. When performing piecing for starting the spinning device 1 or piecing due to yarn breakage, the piecing device 3 is driven to the spinning unit 2 where piecing is to be performed, and all the rollers of the draft unit 7 are operated (ON). Then, the spinning nozzle 27 and the yarn feeding nozzle 36 are operated (ON) to eject compressed air.

The sliver 13 is drawn in the draft section 7, 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 pressurized air jetted from the spinning nozzle 27 flows in the feed direction of the fiber bundle 8 while turning, so that the fiber bundle 8 inserted into the guide hole 21 of the needle holder 23 is turned into a loose false twist state by the swirling flow. While being fed to the vicinity of the entrance 28 of the hollow guide shaft 20.

The compressed air injected from the yarn feed nozzle 36 is supplied to the yarn passage 2 formed in the hollow guide shaft 20.
It flows along the inner peripheral surface in 9 and forms a swirling flow.

Since the yarn passage 29 is formed so as to widen 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 small-diameter introduction portion 30 is under negative pressure. Therefore, air flows in the suction direction (the direction toward the inside of the hollow guide shaft body 20) at the inlet 28 of the hollow guide shaft body 20. Thereby, 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 swung up beforehand (see the phantom line in FIG. 7).
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. 7), the bound spun yarn 47 is guided to the knotter 43.

During this guide, the bound spun yarn 47 is sandwiched between the continuously rotating delivery roller 39 and the nip roller 40, and immediately thereafter, 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.

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. At the time of splicing, the slack of the yarn caused by the stop of the yarn running is sucked by the suction unit 50 and absorbed.

As described above, since the yarn feeding nozzle 36 for applying a feeding force in the yarn passage 29 is provided, the yarn can be fed forward and discharged from the yarn passage outlet 34 at the time of yarn splicing.
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 in the hollow guide shaft body 20 as in the conventional apparatus can be eliminated, and the splicing can be easily and reliably performed.

The normal piecing operation has been described above.
If the bound spun yarn 47 coming out of the hollow guide shaft body 20 cannot be captured by the suction tube 44, or if the yarn is broken when the self-spun bound spun yarn 47 is sucked by the suction tube 44 due to insufficient strength, the suction The yarn that has made a mistake and exits from the outlet 34 of the hollow guide shaft 20 is sucked by the lower dust collector 54 with a relatively weak force without being sucked by the suction pipe 44.

In this case, no feed force is applied to the yarn. On the other hand, if the fiber is continuously supplied in the draft portion 7, the yarn reaches the choke of the nozzle or the hollow guide shaft. If the fiber is further supplied, the fiber is continuously fed to the choking nozzle, and the front roller 18 of the draft portion 7 is worn and damaged. In particular, since the wear of the front roller 18 has a great effect on the yarn properties, improvement is essential. If such a suction error occurs, the splicing cannot be naturally performed, and the unit stops.

Therefore, in the present apparatus, a yarn detecting sensor 53 for detecting the presence or absence of a yarn in the suction pipe 44 is provided, and the control unit controls the draft unit 7 and the spinning nozzle 27 based on the detection result.
In addition, the operation of the yarn feeding nozzle 36 is controlled. Hereinafter, this will be described in detail.

[0046] First, as shown in FIG. 2, when the normal yarn splicing, the yarn end is sucked properly by the suction pipe 44, the yarn there is detected by the yarn detecting sensor 53 at a predetermined time T _0.
The yarn presence / absence detection by the yarn detection sensor 53 is not an extremely short instantaneous confirmation, but rather a confirmation that is continued for a predetermined time slightly longer than that. This makes it possible to reliably detect the absence of a thread even when the suction tube 44 has once suctioned and caught the suction tube 44, but immediately loses it. At this time, as described above, the back roller 14 (B / R) and other rollers 15
17 and 18 continue to be turned on, the spinning nozzle 27 and the yarn feeding nozzle 36 also continue to be turned on, and after a lapse of time ΔT ₂ , the yarn feeding nozzle 36 is turned off. During this ΔT ₂ , the yarn is caught between the delivery roller 39 and the nip roller 40, and after the yarn supply nozzle 36 is turned off, the process is shifted to the normal real twist spinning. The time T ₀ is a time after the completion of the suction capture of the bundled spun yarn 47 discharged from the yarn passage outlet 34 by the suction pipe 44, and the back roller 14
Is set to a time after a predetermined time has elapsed from the time when is turned on.

On the other hand, in the case of a suction error, at the time T ₀ , the absence of the yarn is detected by the yarn detection sensor 53, and at that moment the back roller 14 is turned off and the supply of the fiber is stopped.
And the other rollers 15, 17, 18 of the draft section 7,
The spinning nozzle 27 and the yarn feeding nozzle 36 are connected for a predetermined time ΔT.
₁ and the rollers 15... And both nozzles 27 and 36 are turned off at the same time that the time ΔT ₁ has elapsed.

As described above, when the suction error occurs, the back roller 14 is stopped immediately, so that the supply of the fiber is stopped to prevent the choke of the nozzle choke and the hollow guide shaft from occurring, and the front roller 18 Can prevent wear damage. In addition, since the spinning nozzle 27 and the yarn feeding nozzle 36 are operated during ΔT _1, the fiber remaining in the downstream draft section 7 from the back roller 14 can be discharged as yarn during this time. Can be prevented beforehand. When the choke is prevented in this way, it is possible to perform the yarn splicing a plurality of times (n times of knotting).

In the case of a suction error, the spinning nozzle 27
And after turning off the yarn feeding nozzle 36 (after elapse of ΔT ₁ ),
All the rollers of the draft section 7, the spinning nozzle 27, and the yarn feeding nozzle 36 may be turned on again, and the suction by the suction pipe 44 may be tried again. Then, an alarm may be output when a predetermined number of consecutive mistakes are made.

In this apparatus, the yarn detecting sensor 53 is connected to the suction pipe 44.
, That is, on the piecing device 3 side. In this case, it is not necessary to provide each spinning unit 2, and simplification and cost reduction can be realized by minimizing the number of sensors.

As described above, the back roller 14 of the draft portion 7 is operated and stopped by controlling the fluid cylinder to engage and disengage the clutch. Conventionally, once the driving of the back roller is started at the time of splicing, it cannot be stopped for a certain time determined by a predetermined cam shape. And this also caused the nozzle choke. In the present apparatus, the operation of the back roller 14 is controlled via the fluid cylinder, so that the back roller 14
Can be started and stopped. The fluid cylinder can be replaced with an electromagnetic solenoid or the like. In short, any fluid cylinder can be used as long as the operation of the back roller can be switched based on an electric signal.

As described above, various other embodiments of the present invention can be considered.

[0053]

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

(1) It is possible to prevent the choke of the nozzle choke and the hollow guide shaft at the time of a suction error, thereby preventing the front roller from being damaged.

(2) The fiber remaining in the draft portion at the time of suction error is discharged as a thread, so that chalk can be prevented.

[Brief description of the drawings]

FIG. 1 is a time chart showing an operation state when a suction error occurs.

FIG. 2 is a time chart showing an operation state when normal suction is performed.

FIG. 3 is a sectional view showing a main part of the spinning device.

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a sectional view taken along line XX of FIG. 4;

FIG. 6 is a front view of the spinning device.

FIG. 7 is a vertical sectional side view of the spinning device.

FIG. 8 is a perspective view showing a configuration of a spinning unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Spinning device 7 Draft part 8 Fiber bundle 10 Spun yarn 14 Back roller 20 Hollow guide shaft 27 Spinning nozzle 29 Thread passageway 34 Exit 36 Threading nozzle 44 Suction pipe 47 Bundled spun yarn 52 Guide shaft portion 53 Thread detection sensor ΔT ₁ , ΔT ₂ predetermined time

Claims (3)

[Claims] 1. A draft section, a pneumatic spinning section provided on the downstream side in the spinning direction, a suction pipe for sucking and catching a yarn coming out of an outlet of the pneumatic spinning section, and a yarn in the suction pipe. A spinning device, comprising: a yarn detection sensor for detecting the presence / absence of the yarn; and a control device for controlling operations of the draft unit and the pneumatic spinning unit based on a detection result of the yarn detection sensor. 2. The pneumatic spinning section has two nozzles for generating swirling flows in opposite directions, and the control device controls the timing at a timing after completion of the suction and capture of the yarn by the suction tube at the time of splicing. 2. The spinning apparatus according to claim 1, wherein when the yarn detection sensor detects that there is no yarn, the operation of the back roller of the draft portion is stopped and the two nozzles are controlled to continue operating for a predetermined time. 3. A draft section, a hollow guide shaft provided downstream of the draft direction, a spinning nozzle for generating a swirling flow at an inlet of the hollow guide shaft, and a yarn passage in the hollow guide shaft. And a suction pipe for sucking and catching the yarn coming out of the yarn passage outlet, by giving a swirl flow in the direction opposite to the above-described swirl flow to the yarn in the above, and applying a feed force toward the yarn passage outlet to the yarn. A yarn detection sensor for detecting the presence or absence of a yarn in the suction tube, and a control device for controlling the operation of the draft unit, the spinning nozzle, and the yarn feeding nozzle based on the detection result of the yarn detection sensor. A spinning device.