JP2003166132A - Spinning machinery and spinning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide spinning machinery especially for real twist spun yarns, adjusting, even in piecing, tension, torque and the fluff number of the yarn not to cause uneven dyeing of fiber in a produced package. <P>SOLUTION: This spinning machinery has a higher rank controller 64 and lower rank controllers 31, 32 and 36, wherein these controllers switch the driving speed of a drafting device 4, a delivery roller 17 for sending out a spun yarn Y formed by an air spinning device 5, and a winder 8 from the first driving speed in normal spinning to the second driving speed in piecing made lower than the first spinning speed according to the detected result obtained by a slub catcher 18, and a lower rank controller 33 for switching and controlling the air jet pressure of whirling air flow in an air spinning nozzle 19 of the air spinning device 5 corresponding to the above mentioned change of the driving speed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow guide shaft, an air spinning nozzle for generating a swirling air flow around the yarn feeding upstream end of the hollow guide shaft, and a swirl in a yarn passage of the hollow guide shaft. The present invention relates to a spinning device having an auxiliary nozzle for generating an air flow, and particularly to a technique for preventing a change in a yarn state during yarn splicing.

[0002]

2. Description of the Related Art Conventionally, a hollow guide shaft, an air spinning nozzle for generating a swirling air flow at the yarn feeding upstream end of the hollow guide shaft, and a yarn passage in the hollow guide shaft are provided in the midway of the Japanese Unexamined Patent Application Publication No. There is known a spinning device that includes a nozzle shown in No. -40532 (in the expression in the same item, a suction force generating means) to generate a real twisted yarn. In such a spinning device, first, spinning by the two swirling airflows is started (spinning at the start of spinning is referred to as yarn discharge spinning in the present specification), whereby yarn discharge on the spinning side is performed and knotting is performed. Splicer or other splicing device is used for splicing. in this case,
At the time of yarn joining, the yarn end on the spinning side and the yarn end on the winding side are clamped (gripped) to stop the running of the yarn, and then the two yarn ends are connected. At this time, the yarn is continuously generated and fed from the spinning side, although the yarn end on the spinning side is clamped. Therefore, although slack occurs in the yarn on the spinning side, the slack tube that is a suction means for the yarn slack and has a suction opening on the yarn path absorbs the slack by sucking the yarn. The thread tension is maintained.

[0003]

In recent years, there has been an increasing demand for high-speed spinning in both spinning devices for producing spun yarn in the form of real twist and spinning devices for producing bundled spun yarn.
However, when the yarn feeding speed is increased, the slack length of the yarn becomes long, and the tension cannot be maintained by the conventional suction with the slack tube. Therefore, it may be possible to increase the capacity of the slack tube, but it is difficult in terms of installation space. Then, when the tension changes, the form of the yarn portion spun at the time of change becomes different from the form of the other portion where the tension is maintained. Uneven dyeing occurs in the yarn portion having a different shape. Also, due to the thread slack,
Blipping and thread clogging are likely to occur. Further, by being wound around the package in a state where the tension is lowered, that portion is loosely wound around the package, and a hard package cannot be formed, resulting in a low quality package. The change in the torque and the number of fluffs that occur because the yarn is a true twisted yarn also causes the uneven dyeing.

Here, as a conventional technique for maintaining the tension, there is a technique of Japanese Patent No. 2560474 by the same applicant. The spinning device of the technology includes an air nozzle (spinning nozzle).
And a belt type false twisting device for applying false twisting in a direction opposite to the twisting direction by the swirling airflow of the air nozzle. The spinning principle of this spinning device is different from that of the spinning device that spins the above-described twisted yarn,
The belt type false twisting device acts to propagate the twist to the front roller of the drafting device so as to collect the single fibers fed from the drafting device. Then, the bundled spun yarn is spun by the action of the false twist by the belt type false twist device and the action of the swirling airflow of the air nozzle. The twist applied by the belt is a false twist, and is untwisted after passing through the belt, so that it has little influence on the yarn form produced. Also in the technology of Japanese Patent No. 2560474, the mechanism of the yarn splicing operation, the slack tube, and the like are the same as those of the spinning device for the above-described twisted yarn.

The belt type false twisting device is constructed so that the driving speed is variable, and at the time of yarn splicing, the yarn feeding speed is made lower than that at the time of normal spinning to reduce the slack suction amount by the slack tube and maintain the tension. Accordingly, the belt driving speed of the device is set to a low speed. If the belt driving speed remains fixed when the yarn feeding speed is reduced, the twisting amount that the yarn receives per unit length increases. In addition, the provision of false twist using a belt is to directly contact the yarn and mechanically perform false twist. Therefore, if the number of twists is not adjusted by controlling the belt drive speed according to the yarn feed speed, twist breakage occurs. Therefore, belt drive speed control is performed in order to prevent untwisting.

In the technique of the above-mentioned Japanese Patent No. 2560474,
As described above, the number of twists can be adjusted to prevent the twisting. However, the produced spun yarn is
Wound fibers are wound around the untwisted portion, and the yarn is formed by the balance between the two. Therefore, the belt drive control cannot adjust the torque and the number of fluffs according to the yarn feeding speed. Further, the technology of Japanese Patent No. 2560474 relates to a device for spinning a bundled spun yarn, and compared with the spinning of a real twisted yarn by a hollow guide shaft and an air swirling airflow,
Since the types of yarn that can be spun are limited and the texture is poor, the range of application is limited.

In view of the above, the present invention intends to prevent the occurrence of uneven dyeing of the yarn of the manufactured package by adjusting the tension, torque, and the number of fluffs of the spun yarn, especially in the case of spun yarn in the form of actual twist, even during splicing. To aim.

[0008]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. That is, in claim 1, a draft device, an air spinning unit, a yarn feeding unit for feeding the yarn spun from the air spinning unit, and a winding unit are provided, and the air spinning unit includes a hollow guide shaft body. An air spinning nozzle for generating a swirling air flow around the yarn feeding upstream end of the hollow guide shaft,
A spinning device equipped with an auxiliary nozzle for generating a swirling airflow in a yarn passage of a hollow guide shaft, wherein the draft device, the yarn feeding means, and the winding means are respectively driven at a first driving speed during normal spinning. And a second drive speed at the time of yarn splicing which is lower than the first drive speed.

According to a second aspect of the present invention, a yarn defect detecting section for detecting a defect of the yarn is provided on the yarn path, and the control device controls the first drive speed and the second drive speed based on the detection result of the yarn defect detecting section. The speed is switched.

According to a third aspect of the present invention, an air pressure switching control device for controlling the injection air pressure of the swirling airflow of the air spinning nozzle in accordance with changes in driving speed of the draft device, the yarn feeding means and the winding means. Is provided.

According to a fourth aspect of the present invention, there is provided switching means for continuously changing the air pressure of the pneumatic spinning nozzle, and the driving of the switching means is controlled by the air pressure switching control device.

According to a fifth aspect of the present invention, there is provided switching means for changing the air pressure of the pneumatic spinning nozzle stepwise, and the driving of the switching means is controlled by the air pressure switching control device.

According to a sixth aspect of the present invention, a plurality of weights including the draft device, the yarn feeding means, and the winding means are provided, and the speeds of the weights can be controlled individually.

According to a seventh aspect of the present invention, by using the spinning device according to the first aspect, the driving speed is set to the second driving speed at the time of yarn splicing, and is set to the first driving speed again when the yarn splicing is completed. It is a thing.

According to an eighth aspect of the present invention, when the yarn defect is detected by using the spinning device according to the second aspect, the drive speed is set to the second drive speed, and when the yarn splicing is completed, the first drive speed is resumed. It is what

According to a ninth aspect of the present invention, the spinning device according to the third aspect is used, and at the time of yarn splicing, the driving speed is reduced and the first driving speed is changed to the second driving speed. Then, the injection air pressure of the air spinning nozzle is changed to a pressure lower than that during normal spinning, and then the air is responded to when the drive speed changes from the second drive speed to the first drive speed again. The injection air pressure of the spinning nozzle is changed to the air pressure during normal spinning.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A spinning device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an arrangement configuration diagram of each device of the spinning device of the first embodiment, and FIG. 2 is a front view of the spinning device showing a state in which a large number of spinning units 1 are arranged in parallel. The spinning device of the first embodiment is configured by arranging a large number of spinning units 3 for spinning a single spun yarn Y in the longitudinal direction of a frame 10 that is a machine base. As shown in FIG. 2, a large number of spinning units 3 are arranged in a frame 10 that connects the prime mover box 1 and the blower box 2. In each spinning unit 3, as shown in FIG. 1, a draft device 4, an air spinning section 5, a nip roller 16 / delivery roller 17 which is a yarn feeding means, and a winding means 8 for a spun yarn Y are arranged along a yarn path. Has been done. The draft device 4 is a device that draws the sliver S to form a fiber bundle F and sends the fiber bundle F to the air spinning unit 5. The air spinning unit 5 causes a swirling airflow to act on the fiber bundle F to form a spun yarn Y in a real twist shape. This is a spinning device.
The nip roller 16 and the delivery roller 17 are devices for sending out the spun yarn Y together with the air spinning unit 5, and the winding means 8 is for winding the spun yarn Y around the package P. Hereinafter, the starting end side of the yarn path through which the sliver S is delivered will be referred to as the upstream side of the yarn path, and the ending side of the yarn path with the winding means 8 will be referred to as the downstream side.

The frame 10 is open on the front side and has a U-shaped cross section. Inside the open portion on the front side, the yarn splicing cart 9 is moved along the rails 14 and 15,
It is configured to be able to run between the spinning units 3 ... The yarn splicing carriage 9 includes a yarn splicing device 11 such as a knotter or a splicer equipped with a clamp device (not shown), and a suction nozzle 12 that sucks and captures the spun yarn Y on the spinning side (upstream side of the yarn cutting point) during yarn splicing. A suction mouth 13 for sucking and capturing the spun yarn Y on the winding side (downstream side of the yarn cutting point) from the package P is mounted. The suction nozzle 12 and the suction mouth 13 are each configured to be rotatable. A blower 76 is mounted on the yarn splicing cart 9 as a suction pressure source for both suctions. When performing yarn splicing, the yarn splicing carriage 9 is moved to the spinning unit 3 from which the spun yarn Y has been cut, and stopped at the corresponding unit 3, and the suction nozzle 12 is swung upward to move the air spinning unit 5. The spun yarn Y spun from the pneumatic spinning unit 5 is sucked near the downstream side of the. Further, the suction mouth 13 is swung downward to bring it into contact with the surface of the package P wound by the winding means 8, pull out the once wound yarn end, and suck the spun yarn Y from the package P. Both the suction nozzle 12 and the suction mouth 13 have a yarn end on the spinning side (upstream side of the yarn cutting point) and a winding side (downstream side of the yarn cutting point).
Of the yarn is sucked and captured. Both yarn ends are introduced into the yarn splicing device 11 by swiveling of both the suction nozzle 12 and the suction mouth 13, and are spliced while being clamped by the clamp device.

In the present specification, terms relating to yarn splicing are defined as follows. “Yarn splicing” means the suction nozzle 12 and the suction mouth 13 by the yarn splicing device 11.
Both of the yarn ends that are suction-captured are connected. The “yarn splicing operation” means that the yarn splicing carriage 9 makes the spun yarn Y
Indicates the work operation in the spinning device from the arrival at the cut spinning unit 3 to the end of the “yarn splicing” and the start of normal spinning. In addition, “during yarn splicing” is the time during which “yarn splicing” is performed, that is, the time during which both yarn ends are connected by the yarn splicing device 11 (from time T2 to time T described later).
9). Similarly, the "during the yarn splicing operation" is the time during which the "yarn splicing operation" is performed, that is, the time from the arrival time of the yarn splicing device 11 to the start time of the normal spinning (time T6 to T7 described later), Refers to.

Next, each device constituting each spinning unit 3 will be described along the yarn path. The devices described below are provided for each spinning unit 3. The draft device 4 is provided with a back roller 21a and a third roller 21b along the yarn path, as well as a second roller 23 with an apron 22 and a front roller 24. Back roller 21a and third roller 21b
Is rotatably driven by a motor 25, and the second roller 23
Is rotated by a motor 26. The front roller 24, which sends out the fiber bundle F from the draft device 4 toward the pneumatic spinning unit 5, is rotationally driven by a motor 35. The nip roller 16 / delivery roller 17 and the friction roller 38 of the winding means 8 which will be described later. Is also rotationally driven by the motor 35. Each motor 25 ・ 26 ・ 3
5 includes encoders 28 and 29 for feedback control.
39 is directly connected, and acceleration / deceleration is controlled by lower controllers (control devices) 31, 32, and 36 which are also individually connected. In particular, the front roller 24, the delivery roller 17, and the friction roller 38 are controlled in a synchronized state by the acceleration / deceleration control of the motor 35.

The pneumatic spinning unit 5 will be described with reference to FIGS. 3 to 5. 3 is a side sectional view showing the pneumatic spinning unit 5, FIG. 4 is an enlarged view of a main part of FIG. 3, and FIG.
FIG. As shown in FIG. 3, the air spinning unit 5 is provided with an air spinning nozzle 19 for inserting a stretched fiber bundle F sent from the front roller 24 and applying a swirling airflow to the fiber bundle F. ing. And
Swirl airflow by air spinning nozzle 19 and hollow guide shaft 2
By the action with 0, the spun yarn Y is spun. The spun yarn Y is a true twisted yarn, and because it is a true twisted yarn, it is wound around the package P with a torque.

As shown in FIG. 3, the pneumatic spinning nozzle 19 comprises a needle holder 43 and casings 65 and 66. The auxiliary nozzle 5 is provided downstream of the needle holder 43.
A hollow guide shaft 20 having 5 is arranged.

The needle holder 43 is provided with a guide hole 41 for introducing the fiber bundle F stretched at its upstream end, and a needle 42 is held on the yarn path of the fiber bundle F delivered from the guide hole 41. Has been done. Hollow guide shaft 2
No. 0 is supported by the casing 66 at an intermediate portion in the axial direction. The upstream end 44 of the hollow guide shaft body 20 and the casing 65 are arranged with a predetermined space therebetween, and the casing 65 is hollow. By covering the tip of the guide shaft body 20, the spinning chamber 5 is provided between the tip of the hollow guide shaft body 20 and the rear end (downstream end) of the needle holder 43.
7 are formed.

In the casing 65, a plurality of first swirling nozzle holes 47 opening to the spinning chamber 57 are formed. The first swirling nozzle hole 47 is a hole that is provided so as to face the hollow guide shaft body 20 and that is connected to the inside of the spinning chamber 57 from the outside in the radial direction of the yarn path formed in the air spinning portion 5, and the air is fed into the spinning chamber. 57
As shown in FIG. 4, along the inner circumference of the spinning chamber 5, when viewed from the yarn feeding direction, in the case of Z-twist, the yarn is flown in the counterclockwise direction R1 and the spinning chamber 5
A swirling airflow is generated within 7. in addition,
The first swirling nozzle hole 47 is formed so as to be inclined toward the downstream side in the feeding direction of the fiber bundle F so that the air flows toward the downstream side.

The hollow guide shaft 20 is arranged so that the opening 48 formed in the tip portion 44 faces the needle 42.
It is formed in a substantially cylindrical shape that tapers on the upstream side, and a spun yarn passage 49 is formed on the axial center. The spun yarn passage 49 is
It is formed in a divergent shape toward the yarn delivery side. Specifically, the spun yarn passage 49 is formed by expanding the diameter in multiple stages, and has an introduction hole 50 on the tip end 44 side that opens to the needle holder 43 side and a step on the downstream side of the introduction hole 50. A first enlarged diameter hole 51 whose diameter is enlarged, a second enlarged diameter hole 52 which is smoothly connected to the downstream side of the first enlarged diameter hole 51, and whose diameter is enlarged in a tapered shape, and a second enlarged diameter hole 52. And a third diameter-increasing hole 53 whose diameter is enlarged to form a step on the downstream side. A delivery hole 54 is formed at an end of the third expanded diameter hole 53 on the delivery side of the spun yarn Y.

At the midway portion of the hollow guide shaft body 20 in the axial direction,
An auxiliary nozzle 55 for sucking the fiber bundle F swung by the first swirling nozzle hole 47 and introducing the fiber bundle F into the introducing hole 50 is provided. As shown in FIGS. 4 and 5, the auxiliary nozzle 5
Reference numeral 5 denotes a plurality of second swirling nozzle holes 56 provided in the hollow guide shaft body 20 at an axially intermediate portion in a direction perpendicular to the spun yarn passage 49. Second swirling nozzle hole 56
5, as shown in FIG. 5, along the inner circumference of the spun yarn passage 49, when viewed from the yarn feeding direction, in the case of Z twist, air is made to flow in the clockwise direction R2, for example, at eight locations at equal intervals. ,
It is formed so as to be connected to the first expanded diameter hole 51. That is, the auxiliary nozzle 55 is configured to generate a swirling airflow in a direction opposite to that of the air spinning nozzle 19. Inside the hollow guide shaft body 20, an air passage 37 is formed which extends from the vicinity of the delivery port 54 toward the upstream front end side and communicates with each second swirling nozzle hole 56. The air passage 37 has an outlet 54.
It is connected to the compressed air supply passage 58 on the side and can supply air to the second swirl nozzle hole 56.

The auxiliary nozzle 55 is preferably located as close as possible to the nip point of the fiber bundle F of the front roller 24. This is because the fiber bundle F exiting the front roller 24 is drawn into the hollow guide shaft body 20 by a stronger suction force during the yarn discharge spinning, and the swirling airflow from the auxiliary nozzle 55 causes the front roller 24 to move. This is because the twist is propagated to the ejected fiber bundle F to help capture the fibers.

As shown in FIG. 1, the air is supplied to the air spinning unit 5 by the compressed air generating source 6 provided in the spinning device, the first air pressure switching means 27 provided for each spinning unit 3, This is performed via the second air pressure switching means 68. The air having a predetermined injection air pressure by the first air pressure switching means 27 is supplied to the first swirling nozzle hole 47 of the air spinning nozzle 19, and is made a predetermined injection air pressure by the second air pressure switching means 68. Air is supplied to the second swirl nozzle hole 56 of the auxiliary nozzle 55.

Next, the operation of the pneumatic spinning section 5 at the time of yarn splicing will be described. The fiber bundle F sent to the pneumatic spinning unit 5 is inserted through the guide hole 41 of the needle holder 43,
In the air spinning unit 5, compressed air is jetted from both the first swirling nozzle hole 47 and the second swirling nozzle hole 56. The first swirling nozzle hole 47 is formed so as to be inclined toward the downstream side of the fiber bundle F in the yarn feeding direction, and the compressed air jetted from the first swirling nozzle hole 47 flows in the feeding direction of the fiber bundle F while swirling. Therefore, the fiber bundle F inserted through the guide hole 41 of the needle holder 43 is sent to the vicinity of the opening 48 of the hollow guide shaft body 20 while being loosely twisted by the swirling airflow.

Further, at the time of yarn splicing, compressed air is jetted from the second swirling nozzle hole 56 of the auxiliary nozzle 56, and the compressed air flows along the inner peripheral surface in the spun yarn passage 49 formed in the hollow guide shaft body 20. Flow to form a swirling airflow. In addition, during normal spinning, which is not the yarn discharge spinning (at the start of spinning the yarn),
Compressed air is not jetted from the second swirl nozzle hole 56, but compressed air is jetted only from the first swirl nozzle hole 47 to spun the spun yarn Y in the real twist shape.

Since the spun yarn passage 49 is formed in a divergent shape toward the delivery side of the spun yarn Y, the compressed air injected into the spun yarn passage 49 through the second swirl nozzle hole 56 is The spun yarn Y flows toward the delivery side, and the introduction portion 50
Is negative pressure. Therefore, the opening 48 formed at the tip of the hollow guide shaft body 20 has a suction direction (the hollow guide shaft body 2).
A flow of air is generated in the direction (0). Thereby, the fiber bundle F can be continuously drawn.

The false-twisted fiber bundle F sent near the opening 48 of the hollow guide shaft 20 is sucked into the spun yarn passage 49 in the opening 48 by the suction flow from the opening 48. Then, the fiber bundle F reaches the first diameter-expanding hole 51 and is exposed to a swirling airflow in a direction opposite to that of the air spinning nozzle 19. Therefore, according to a known spinning technique of spinning the spun yarn Y by rotating nozzles in mutually opposite directions, the loose fiber-twisted fiber bundle F is delivered from the hollow guide shaft body 20 while being spun into a bundled fiber shape, and is spun out. Is done.

Next, the yarn feeding means will be described. The delivery roller 17 on the downstream side of the pneumatic spinning unit 5 has a motor 35.
It is driven to rotate with the yarn path in between, and the delivery roller 1
The nip roller 16 is arranged so as to be able to come into contact with and separate from the delivery roller 17 so as to face the roller 7. The spun yarn Y passing through the yarn path is delivered by the delivery roller 17 and the delivery roller 17.
And is nipped by the nip roller 16 that is driven to rotate and is delivered to the downstream side. At the time of yarn splicing, first, the yarn end on the spinning side is formed into a bundle spun yarn U by the above-described yarn discharge spinning, and the bundle spun yarn U is sent out from the air spinning unit 5. The yarn is sucked into the suction nozzle 12 and the suction nozzle 1
By the turning of 2, the spun yarn Y is guided between the nip roller 16 and the delivery roller 17. Then, the yarn is arranged along the yarn path to give a yarn feeding force to the downstream side. When the yarn is spun into the united spun yarn U and nipped between the nip roller 16 and the delivery roller 17, and stable yarn feeding is performed, the lower controller 34 and the second air pressure switching means 68 cause The supply of compressed air to the double swirl nozzle hole 56 is stopped. When the yarn discharge spinning is completed, air is jetted only by the air spinning nozzle 19. The delivery roller 17 is driven by the same motor 35 as the front roller 24 and the friction roller 38, as described above.

On the downstream side of the delivery roller 17, a suction pipe called a slack tube 40 for removing the slack in the yarn splicing is provided. During the yarn splicing operation, the yarns on the spinning side and the winding side that are suction-captured by the suction nozzle 12 and the suction mouth 13 are introduced from the yarn splicing device 11 until the yarn splicing ends. Although the traveling of the yarn end is stopped by the clamp device of the yarn joining device 11, the yarns on the spinning side are spun one after another, so that yarn slack occurs. Here, in order to continue to apply tension to the yarn on the spinning side, suction is performed by the slack tube 40 to absorb the slack of the yarn.

On the downstream side of the slack tube 40, a slab catcher 18, which is a yarn defect detecting section, is provided as a means for detecting a yarn defect and detecting the presence or absence of yarn running. A thread defect is detected by the slab catcher 18,
When the spun yarn Y is cut or natural yarn breakage occurs, the spun yarn Y on the winding side (downstream side of the yarn cutting point) is wound up on the package P side, and the spun side (upstream of the yarn cutting point). side)
Then, the feeding of the sliver S is stopped.

The winding means 8 comprises a friction roller 38 which comes into contact with the peripheral surface of the package P, and a traverse device 7. The friction roller 38, as described above,
It is driven by the same motor 35 as the front roller 24 and the delivery roller 17. A traverse device 7 for uniformly winding the spun yarn Y around the package P is provided near the upstream side of the friction roller 38. The traverse device 7 is driven by the motor 44,
The motor 44 includes an encoder 45 for feedback control.
Are directly connected. A lower controller 46 for controlling acceleration / deceleration of the motor 44 is connected to the motor 44.

The spinning unit 3 is provided with an upper controller (control device) 64 for controlling and controlling the lower controllers 31, 32, 36, and 46, and mainly applies a timing signal to each controller, The movements of are designed so that they can be moved smoothly. Further, the host controller 64 includes a slab catcher 18 which is a yarn defect detecting section.
The signal from is also input.

Next, spinning and yarn splicing operations in the spinning device of the first embodiment will be described with reference to FIGS. 1 and 6. FIG. 6 is a diagram showing an acceleration / deceleration pattern of the yarn feeding speed of each device. Here, the yarn feeding speed of the spun yarn Y is set to the front roller 24 (draft device 4) and the delivery roller 17
(Yarn feeding means) and the rotational speed of the friction roller 38 (winding means 8). In the present invention, the yarn slack Ya length is reduced by accelerating and decelerating the rollers 24, 17 and 38 that determine the yarn feeding speed of the spun yarn Y during yarn splicing.

To repeat, "yarn splicing" means nozzle 12
The two yarn ends sucked and captured by the mouse 13 are connected, and the "yarn splicing operation" is started after the yarn splicing cart 9 arrives at the spinning unit 3 in question. Up to the work operation in the spinning device. Further, the time during which the "yarn splicing" is performed is "during the splicing operation", and the time during which the "yarn splicing operation" is performed is the "during the splicing operation". In FIG. 6, FIG. 9, and FIG. 12 used in the description of the first to third embodiments below, “during splicing” is time T
It indicates the time from 6 to T7, and the "during the yarn splicing operation" indicates the time from time T2 to T9.

A yarn defect such as a slab is detected by the slab catcher 18 and the yarn Y is cut by a cutter (not shown), or the absence of the yarn is detected by clogging of the fiber bundle F in the air spinning unit 5. If so, the yarn defect signal is input to the host controller 64 based on these detections. The detection time of the yarn defect is set to T0 shown in FIG. The following other times also match those shown in FIG. At this time, based on the yarn defect signal, the host controller 64
A command signal is output to each lower controller,
As shown in FIG. 6A, the motor 25 of the draft device 4 is immediately stopped, and as shown in FIG. 6B, the motor 29 for driving the second roller 23 and the following three rollers, namely, Front roller 24, delivery roller 1
7, a motor 35 for driving the friction roller 38,
A deceleration command is given to the motor 44 that drives the traverse device 7 (time T0), and the yarn feeding speed during normal spinning is switched to the yarn feeding speed during yarn splicing (time T1). Hereinafter, the yarn feeding speed during normal spinning will be referred to as a first driving speed, and the yarn feeding speed during yarn splicing will be referred to as a second driving speed. The second drive speed is lower than the first drive speed. Here, when the motors 25 of the draft device 4 are stopped, the supply of the sliver S is stopped and the delivery of the spun yarn Y from the pneumatic spinning unit 5 is also stopped. Further, by detecting the yarn defect, the spun yarn Y on the downstream side of the cut portion is wound into the package P.

When a yarn defect or no yarn is detected, the yarn splicing carriage 9 arrives at the corresponding unit 3 for yarn splicing (time T).
2). Then, the yarn splicing operation described above is started by turning the suction nozzle 12 and the suction mouth 13, etc., but prior to this yarn splicing operation, the draft device 4
And the pneumatic spinning unit 5 is started up as follows. That is, a command from the upper controller 64 is issued to the lower controller 31, and based on the programmed acceleration / deceleration pattern as shown in FIG. 6A, at time T2 when the suction nozzle 12 and the suction mouse 13 turn, A speed-up instruction is given to the motor 25.
This speed-up command is indicated by the inclined portion from time T2 to time T3 in the acceleration / deceleration pattern of FIG. Incidentally, time T
Immediately before 2, the package P is separated from the friction roller 38, and the package P is reversely driven.
As a result, the supply of the sliver S is restarted, the compressed air supply to the second swirl nozzle hole 56 is started by the second air pressure switching means 68, and the yarn discharge spinning is started.

In response to the above deceleration / acceleration command, each motor 2
When the yarn feeding speeds by the driving of 5.26, 35, and 44 each become the second driving speed, the yarn feeding speed is maintained at the second driving speed (time T3 to T7). The drive speed of the traverse device 7 is also controlled according to the yarn feed speed.
At the time of this deceleration / acceleration, the sliver S is successively stretched by the draft device 4 and sent to the air spinning unit 5, but in the draft device 4, the peripheral acceleration of the rollers 23, 24 is controlled to be constant, After time T3, each roller 21.2
By controlling the peripheral speed ratios of 1a, 23, and 24 to be the same as those during normal spinning, the sliver S having a proper thickness and a proper thickness is introduced into the air spinning unit 5, and the nozzle It does not cause clogging and reduces threading failures.

During the time T3 to T6 when the yarn feed speed is maintained at the second drive speed, the suction nozzle 12 sucks and captures the yarn on the spinning side and turns to the original position. The yarn is nipped between the delivery roller 17 and the nip roller 16 (time T4). The yarn on the spinning side is
By being nipped by both rollers, a feeding force to the downstream side is given on the yarn path.

In order to wind only the real twist spun yarn Y into the package P, in the yarn on the spinning side, the bundle spun yarn U is used.
Is unnecessary. What is useful is the part of the twisted yarn upstream of the part of the united spun yarn U. Therefore, of the yarn on the spinning side, the portion formed on the spun yarn Y having a real twist shape is sucked and captured by the suction nozzle 12, and the yarn joining device 1
Introduced into No. 1 to perform yarn splicing. That is,
At the time of yarn splicing, the suction nozzle 12 first sucks the portion of the yarn on the spinning side formed on the bundled spun yarn U and nips it between the nip roller 16 and the delivery roller 17 to feed the yarn to the downstream side. A force is applied and the force is introduced into the yarn joining device 11. Next, the suction nozzle 12 sucks the spun-side yarn end until at least the portion of the spun yarn Y, which is sent in association with the end of the yarn discharge spinning and is formed into a true twist, is supplied into the yarn joining device 11. It is supposed to do.

When the bundled spun yarn U portion of the yarn on the spinning side is nipped (time T4), the spinning of the real twist spun yarn Y is started in the air spinning portion 5 (time T5). . Then, between the time T6 and the time T7, the yarn ends on the spinning side and the winding side are respectively clamped, and both yarn ends are maintained at predetermined positions to perform the yarn splicing operation. At time T6, the air twisting unit 5 spun the real twisted spun yarn Y.
The bundled spun yarn U portion of the spun yarn Y completely enters the suction nozzle 12 and is continuously sucked. In the yarn splicing operation, the suction nozzle 12 sucks and catches the spun yarn Y portion of the yarn on the spinning side, and when the yarn defect is detected and the yarn is cut, the friction roller 38 and the package are used. After the contact with P is released, the reverse rotation of the package P and the suction mouth 13 suction-capture the yarn end on the winding side including the yarn defect. In the suction by the suction mouth 13, at least the yarn defect portion completely enters the suction mouth 13 and a normal real twisted yarn is obtained in the yarn splicing device 1.
It is performed until it is supplied to 1. Then, the portions of both yarns that are in the normal twisted state are introduced into the yarn joining device 11 and are joined together. At this time, the yarn end portion including the bound spun yarn U and the yarn end portion including the yarn defect by the yarn discharge spinning are removed, and only the actual twisted yarn is wound.

At the time of yarn splicing from time T6 to time T7, the yarn on the spinning side and the yarn end on the winding side are held at predetermined positions for a predetermined time, so that the yarn spun during that time is the slack tube 40. Inside, it is sucked in a U shape as shown in FIG. During this time, in order to reduce the length of the yarn slack Ya sucked into the slack tube 40, the yarn feeding speed is controlled to be accelerated or decelerated. Specifically, the acceleration / deceleration control is first performed by deceleration control (time T0 to T1) to the second drive speed, and is maintained at the second drive speed for a certain period of time (time T1 to T7).

Time T7, which is the timing for switching the yarn feeding speed to the high speed side (first driving speed rather than second driving speed)
Can be specified in the host controller 64 by the following method, for example, but is not limited to this method. As a first method, when a predetermined time passes from time T2 or T3 to time T7 using a timer, a detection signal is transmitted from the timer to the host controller 64, and time T7 is set in the host controller 64. To identify. As a second method, the yarn joining device 11 detects that both yarn ends are connected, and the time T7 is specified by the host controller 64.

At the end of the yarn splicing (time T7), the clamped state by the yarn splicing device 11 is released, and the friction roller 38 comes into contact with the package P again, so that the winding of the package P is restarted and the slack tube is restarted. 40
The thread slack that has accumulated inside begins to be resolved. When the clamped state by the yarn joining device 11 is released and the winding is resumed, the yarn slack is reduced. Therefore, in order to return to the normal spinning state, the yarn feeding speed is set to the first drive speed again, and then (time After T9), the first drive speed is maintained. Further, preferably, when the contact point between the package P and the friction roller 38 is set slightly earlier than the start point of the speedup control of the front roller 24 and the delivery roller 17, the speedup of the rotation of the package P itself is speeded up. It is possible to eliminate the yarn slack accumulated in the slack tube 40 in a short time. Since the acceleration timing of the package P is delayed due to the inertia of the weight of the package P itself and the like, this is taken into consideration to accelerate the speed earlier.

When the yarn splicing is completed, the spun yarn Y is continuously spun at the first driving speed.

As described above, in the spinning machine of the first embodiment, the upper controller 64 and the lower controllers 31, 32, 36, 46 are provided and the slab catcher 18 is provided.
Based on the detection result of the yarn defect by
The second roller 23 and the front roller 24, the delivery roller 17, which is the yarn feeding means, and the friction roller 38, which is the winding means, are subjected to acceleration / deceleration control. It should be noted that depending on the yarn type, only by lowering the yarn feeding speed, even if the jet air pressure from the air spinning nozzle 19 is the same as that during normal spinning as in the first embodiment, the yarn torque,
In some cases, the number of fluffs is not affected, and the number is maintained almost constant. In the above, at the time of yarn splicing, the yarn feeding speed by each device provided along the yarn path is reduced, so that the length of the yarn slack Ya can be shortened while maintaining the tension of the yarn. Therefore, the length of the slack tube 40 for sucking the yarn slack Ya can be shortened. It is also possible to prevent the occurrence of warp and thread clogging in the slack portion, which tends to occur due to an excessive slack length.

In addition, when the yarn defect of the slab catcher 18 is detected, the upper controller 64 and the lower controllers 31, 32, 36, and 46 control the yarn feed speed to be reduced. The thread feed speed can be set to a low speed before starting,
The yarn feed speed is reliably reduced at the time of yarn splicing.

Next, the spinning device of the second embodiment will be described with reference to FIGS. 6 to 9. FIG. 7 is a layout configuration diagram of each device of the spinning device of the second embodiment, FIG. 8 is a block diagram showing the configuration of the first switching mechanism 27, and FIG. 9 is a diagram showing the injection air pressure of the air spinning nozzle 19. It is a figure which shows a pressure reduction pattern. Members common to those of the first embodiment are designated by the same reference numerals as those of the first embodiment, and description of common parts will be omitted below.

In the second embodiment, at the time of yarn splicing, the rollers 24, 17 ... Which determine the yarn feeding speed of the spun yarn Y
In addition to the acceleration / deceleration control of 38, the air pressure injected from the air spinning nozzle 19 of the air spinning unit 5 is controlled to be switched between high and low. This is for the following reason. With yarn types other than the yarn described in the first embodiment (the control of the nozzle 19 is unnecessary),
When the spun yarn Y is spun, if the air pressure ejected from the air spinning nozzle 19 is kept fixed while the yarn feeding speed is reduced, it is added per unit length of the yarn (fiber bundle F). The air injection amount increases more than usual. That is,
The monofilaments constituting the fiber bundle F are more tightly wound than in ordinary spinning, and the strongly tightened yarn is formed only in that portion, and there is a portion where the torque changes and the number of fluffs decreases. As a result, uneven dyeing occurs at that portion. Therefore, the jet air pressure is also controlled substantially in synchronization with the control of the yarn feeding speed.

In the spinning unit 103 which constitutes the spinning apparatus of the second embodiment, as shown in FIG. 7, the lower controller 3 individually connected to the air pressure switching means 27, 68.
3.34 is provided. In addition, the lower controller 3
The 3.34 are also controlled by the upper controller 64, and these controllers constitute an air pressure switching control device.

In the second embodiment, the pressurizing / depressurizing control of the air pressure of the air spinning nozzle 19 is performed at the time of yarn splicing.
The control of the yarn feeding speed is performed in the same manner as described above. Based on the acceleration / deceleration pattern shown in FIGS. 6A and 6B, the control of the motors 25, 26, 35 and 44 is performed by the lower controller. It is performed by 31, 32, 36, 46.

As shown in FIGS. 6 (a) and 6 (b), the yarn discharge spinning from the pneumatic spinning unit 5 is after time T3. Therefore, the minimum pressure reduction control of the injection air pressure is required after the time T3 when the yarn feeding speed changes.
The time when the deceleration command for the motors 39 and 44 is given (time T
0) to the time (time T4) when the nip of the yarn on the spinning side is completed (time T4), the jet air pressure of the air spinning nozzle 19 is controlled by the motor 25.
The pressure is reduced in synchronization with changes in 26, 35, and 44.
The air pressure of the auxiliary nozzle 55 is preferably set to a lower pressure than the air pressure of the first embodiment by the lower controller 34. The bundled spun yarn U portion formed at the tip of the spinning side yarn is prevented from being broken and is properly spun by appropriately switching the injection air pressure of the air spinning nozzle 19 during spinning. The success rate is improved.

The first air pressure switching means 27 is, as shown in FIG. 8, a stepless switching valve 70 and a driving means 7 for the switching valve 70.
1 and 1. The compressed air generating source 6 and the air spinning nozzle 19 provided in the air spinning unit 5 are connected so as to be communicable with each other through an air path 72, and are supplied to the air spinning nozzle 19 by switching the air pressure of a switching valve 70. The air pressure applied can be changed steplessly. The switching valve 70 is switched by driving the driving means 71, and the driving means 71 is connected to the lower controller 33. And in FIG.
The drive means 71 is controlled by the lower controller 33 so as to switch the switching valve 70 based on the programmed pressure increase / decrease pattern as shown in FIG. Since the compressed air jet from the auxiliary nozzle 55 is performed while the air spinning nozzle 19 is at the jet air pressure at the time of yarn splicing, it is not necessary to switch the air pressure of the auxiliary nozzle 55.

In the second embodiment, the change in the jet air pressure at the air spinning nozzle 19 during yarn splicing is continuously performed in accordance with the yarn feeding speed, as shown in FIGS. 6 and 9. It is something that can be done. When the yarn feed speed is reduced, the jet air pressure is also reduced, when the yarn feed speed is constant, the jet air pressure is also constant, and when the yarn feed speed is increased again, the jet air pressure is also increased. To be done. Therefore, at time T6
From T to T7, and at the time of returning to normal spinning, the torque and the number of fluffs of the actual twisted spun yarn Y spun in the air spinning unit 5 are the same as those in normal spinning. be able to. This is because the injection air pressure is increased or decreased according to the acceleration / deceleration of the yarn feeding speed, so that the energy amount of the injection air applied per unit length of the yarn is also maintained substantially constant.

Since the auxiliary nozzle 55 is involved in spinning the bundled spun yarn U, air is not ejected from the auxiliary nozzle 55 during the yarn splicing operation from time T6 to T7. For this reason, since there is no relation to spinning during the yarn splicing operation, the injection is stopped during this period.

As described above, in the spinning device of the second embodiment, the lower controller 33 is added in addition to the structure of the first embodiment, and the draft device 4 of the draft device 4 is detected based on the detection result of the yarn defect by the slab catcher 18. Front roller 24,
The delivery roller 17 constituting the yarn feeding means and the friction roller 38 of the winding means are controlled to be accelerated and decelerated, and the injection air pressure from the air spinning nozzle 19 is controlled to be increased and decreased. Therefore, at the time of yarn splicing, the amount of slack Ya of the yarn can be suppressed while maintaining the tension of the yarn, and even if the yarn feeding speed changes, the jet air applied per unit length of the spun yarn Y can be reduced. It is possible to maintain constant energy, and the yarn torque and the number of fluffs can be brought into a state almost equal to those during normal spinning. Therefore, it is possible to prevent the occurrence of uneven dyeing at the yarn spliced portion.

Further, in the second embodiment, the pressure control of the injection air pressure from the air spinning nozzle 19 is configured to be continuously performed by using the continuously variable switching valve 71. Therefore, the injection air pressure from the air spinning nozzle 19 can be changed accurately by following the yarn feeding speed. Therefore, the energy of the blast air applied per unit length of the spun yarn Y can be maintained in the same state as during normal spinning. Therefore, the spun yarn Y of the yarn splicing portion and the portion manufactured by other ordinary spinning are
It is possible to get closer to the equivalent state.

Next, the spinning device of the third embodiment will be described with reference to FIGS. 6 and 10 to 12. FIG. 10 is an arrangement configuration diagram of each device of the spinning device of the third embodiment.
1 is a block diagram showing the configuration of the first switching mechanism 127, and FIG. 12 is a diagram showing a pressure increase / decrease pattern of the injection air pressure of the air spinning nozzle 19. The spinning device of the third embodiment is provided with a step-type switching valve 170 as shown in FIG. 11, instead of the stepless switching valve 70 provided in the spinning device of the second embodiment. Along with this, a drive means 171 is provided instead of the drive means 71 shown in the second embodiment, and the first air pressure switching means 127 is provided instead of the first air pressure switching means 27 provided in the second embodiment. Is provided. Further, in response to the change of the switching mechanism, a lower controller 133 is installed in the spinning device of the third embodiment instead of the lower controller 33 of the second embodiment. For example, the compressed air preparation chamber 172a supplied with the air pressure in the middle of FIG. 12 and the compressed air preparation chamber 172 supplied with the air pressure during normal spinning.
b and the path not passing through the compressed air producing chamber are connected in parallel to the switching valve 170. Further, the compressed air pressure of the compressed air generation source 6 is used as the air pressure at the time of yarn splicing, and
The air pressure passing through 2a and 172b can be supplied as air pressure during normal spinning, and air pressure that is lower than the air pressure but higher than the air pressure during yarn splicing. And The switching valve 170 is appropriately switched by driving the driving means 171, and the driving means 171.
Is connected to the lower controller 133. Then, the drive means 171 is controlled by the lower controller 133 so as to switch the switching valve 170 based on the programmed pressure increasing / decreasing pattern as shown in FIG. The lower controller 133 is also controlled by the upper controller 64. The number of the compressed air producing chambers provided is not limited to the above-mentioned number, and those having different air pressures may be added so that the number of stages is further increased.

The difference between the spinning devices of the third embodiment and the second embodiment is that the first air pressure switching means 27 for the air spinning nozzle 19
The only difference is the configuration of the 127 (switching valves 70, 170) and the other configurations are the same as each other. Similar members are denoted by the same reference numerals, and description thereof is omitted. Due to the difference in the configuration of the first air pressure switching means, in the third embodiment,
The pressurization / depressurization pattern (illustrated in FIG. 12) of the air jetted from the air spinning nozzle 19 is different from the pressurization / depressurization pattern (illustrated in FIG. 8) of the second embodiment. on the other hand,
Regarding the control of the yarn feeding speed, the control of the motors 25, 26, 35, 44 is based on the acceleration / deceleration pattern shown in FIGS. 6 (a) and 6 (b) as in the first and second embodiments. It is performed by the controllers 31, 32, 36, and 46.

In the third embodiment, the change in the jet air pressure at the air spinning nozzle 19 during the yarn splicing operation is as shown in FIGS. 6 and 12, when the yarn feed speed is reduced. When the yarn feed speed is constant, the jet air pressure is also constant, and when the yarn feed speed is increased again, the jet air pressure is also increased. Is performed stepwise after a time T8 at which the air pressure is switched to the middle stage in accordance with the yarn feeding speed. In the graph drawn in FIG. 12, the solid line shows the injection air pressure, and the alternate long and short dash line shows the compressed air pressure switched by the switching valve 170 of the first air pressure switching means 127. Since the propagation velocity of compressed air is sonic velocity, there is a time lag between the time of switching by the switching valve 170 and the time when the compressed air pressure supplied from the switching valve 170 propagates to the air spinning nozzle 19. Therefore, the compressed air pressure switched by the switching valve 170 and the injection air pressure at the air spinning nozzle 19 do not completely match, and the injection air pressure changes gently. When the yarn feed speed is increased, the injection air pressure changes in a substantially stepwise manner.

When the injection air pressure is not controlled in accordance with the yarn feeding speed because the injection air pressure is configured to change in a step-like manner at the time of increasing the speed (injection air pressure Of the spun yarn Y, the change in the form of the spun spun yarn Y can be reduced. That is, since the fluctuation of the energy amount of the jet air applied per unit length of the yarn in the pneumatic spinning unit 5 is suppressed to be small as compared with the case where the control is not performed, the spinning in the pneumatic spinning unit 5 is performed. The torque and the number of fluffs of the actual twisted spun yarn Y can be approximated to the yarn state during normal spinning.

In the spinning devices of the first to third embodiments described above, when yarn splicing is performed with a certain weight, the yarn feeding speed is reduced without affecting other weights that are normally spinning. In order to do so, each device related to the yarn feeding of the spun yarn Y, that is, the draft device 4, the delivery roller 17 constituting the yarn feeding means, and the winding means 8 are, as described above,
Each weight (each spinning unit) is driven by its own drive motor. Therefore, it is easy to perform the acceleration / deceleration control of the yarn feeding speed for each weight. In the case of the conventional case where a plurality of weights are driven by a common drive means such as a line shaft, each weight has only two choices: a drive state or a stopped state, and acceleration / deceleration control for each weight alone is not possible. Have difficulty. However, the configuration is not limited to the above-described configuration in which a drive motor is used for each weight independently, as long as transmission means for transmitting drive is arranged for each weight so that speed can be individually controlled.

At the time of yarn splicing, the slab catcher 18
Based on the yarn defect detection by
In addition to starting the deceleration control of the yarn feeding speed by 35 and 44, for example, detection means for detecting the arrival of the yarn splicing carriage 9 may be provided, and deceleration control may be performed based on the detection by the detection means. . Alternatively, the timing of clamping the yarn end by the yarn joining device 11 may be detected, and deceleration control may be performed based on the detection.

The pneumatic spinning unit in the embodiment of the present invention is
The configuration is not limited to the above. For example,
The hollow guide shaft body includes a front external cylinder including a tip portion and an introduction portion, a rear external cylinder connected to a compressed air supply passage, a first expanded diameter portion, a second expanded diameter portion, and a third expanded diameter portion. , A separate body such as an internal cylinder including a second swirling nozzle hole, which are fitted together to form an air passage by a gap between the front external cylinder, the rear external cylinder, and the internal cylinder. Good. With the above configuration, the auxiliary nozzle configured by the second swirling nozzle hole,
Be as close as possible to the nip point of the fiber bundle of the front roller. The fitting may be detachable via a seal member such as an O-ring in order to prevent air leakage. The second swirling nozzle hole may be configured so as to be inclined toward the downstream side with respect to the plane orthogonal to the first expanded diameter portion. The air flow of the yarn passage formed by the compressed air jetted from the auxiliary nozzle is not limited to the swirling air flow, and may be a non-swirling straight air flow from the opening at the tip of the hollow guide shaft toward the discharge port. .

[0069]

As described in claim 1, a draft device,
An air spinning unit, a yarn feeding unit for feeding the yarn spun from the air spinning unit, and a winding unit are provided, and the air spinning unit includes a hollow guide shaft and a yarn feeding upstream end of the hollow guide shaft. A spinning device comprising an air spinning nozzle for generating a swirling airflow in the periphery and an auxiliary nozzle for generating a swirling airflow in a yarn passage of a hollow guide shaft, the drafting device, a yarn feeding means,
Since a control device for switching the drive speed of the winding means between the first drive speed during normal spinning and the second drive speed during yarn splicing, which is slower than the first drive speed, is provided, so that during yarn splicing The yarn feeding speed of each device provided along the yarn path is reduced, and the tension of the yarn can be maintained while shortening the length of the slack of the yarn as compared with the normal spinning. Therefore, a high quality package can be manufactured. Moreover, since the change in the tension applied to the yarn is suppressed, the yarn form is maintained and uneven dyeing can be prevented. Furthermore, it is possible to prevent the occurrence of looseness and thread clogging in the slack portion, which is likely to occur due to an excessive slack length.

According to a second aspect of the present invention, a yarn defect detecting section for detecting a defect of the yarn is provided on the yarn path, and the control device determines the first drive speed and the second speed based on the detection result of the yarn defect detecting section. Since the drive speed is switched, the control to reduce the yarn feed speed is performed, and the yarn feed speed can be lowered in advance before the yarn splicing operation of the yarn splicing device is started. Will definitely slow down.

According to a third aspect of the present invention, an air pressure switching control for controlling the injection air pressure of the swirling airflow of the air spinning nozzle in accordance with changes in the driving speed of the draft device, the yarn feeding means and the winding means. Since the device is provided, it is possible to suppress the amount of slack in the yarn while maintaining the tension of the yarn at the time of yarn splicing, and even if the yarn feed speed changes, the jetting given per unit length of the spun yarn The energy of the air can be kept constant, and the torque and the number of fluffs of the yarn can be made almost the same as those in normal spinning. Therefore, it is possible to prevent the occurrence of uneven dyeing at the yarn spliced portion.

As described in claim 4, since the switching means for continuously changing the air pressure of the air spinning nozzle is provided, and the driving of the switching means is controlled by the air pressure switching control device, the air spinning nozzle is driven. The jet air pressure can be changed accurately by following the yarn feed speed. Therefore, the energy of the blast air applied per unit length of the spun yarn can be maintained in the same state as during normal spinning. Therefore, the spun yarn of the yarn splicing portion and the portion manufactured by other ordinary spinning can be brought into a state of being substantially equivalent.

As described in claim 5, since the switching means for changing the air pressure of the pneumatic spinning nozzle in a stepwise manner is provided, and the driving of the switching means is controlled by the air pressure switching control device, the unit length of yarn is Fluctuations in the amount of energy of the injection air applied per hit, compared with the case where the control is not performed,
The torque and the number of fluffs of the actual twisted spun yarn Y spun in the air spinning unit 5 can be made small, and can be approximated to the state during normal spinning. Moreover, when the difference between the normal pressure and the pressure at the time of yarn splicing is large, compared to the case where the air pressure is continuously changed to follow the yarn feed speed, the air jet nozzle's jet air The pressure is gradually changed in a plurality of steps.

As described in claim 6, a plurality of weights provided with the draft device, the yarn feeding means and the winding means are provided, and the speed can be controlled individually for each weight, so that a certain weight can be used. When performing yarn splicing, the yarn feeding speed can be reduced only by the weight performing the yarn splicing, without affecting other weights that are normally spinning.

According to a seventh aspect of the present invention, by using the spinning device according to the first aspect, the driving speed is set to the second driving speed at the time of yarn splicing, and when the yarn splicing is completed, the driving speed is set to the first driving speed again. Therefore, at the time of yarn splicing, the yarn feeding speed by each device provided along the yarn path is slowed down, and the tension of the yarn is maintained while shortening the length of the slack of the yarn as compared with that during normal spinning. You can Therefore, a high quality package can be manufactured. Moreover, since the change in the tension applied to the yarn is suppressed, the yarn form is maintained and uneven dyeing can be prevented. Furthermore, it is possible to prevent the occurrence of looseness and thread clogging in the slack portion, which is likely to occur due to an excessive slack length.

According to the eighth aspect, when the yarn defect is detected by using the spinning device according to the second aspect, the driving speed is set to the second driving speed, and when the yarn splicing is completed, the first driving is performed again. Since the speed is set to the speed, control is performed to reduce the yarn feeding speed, and the yarn feeding speed can be reduced in advance before the yarn joining operation of the yarn joining device is started. Certainly slow down.

According to a ninth aspect of the present invention, it is possible to use the spinning device according to the third aspect, and to cope with the fact that the drive speed is reduced and the first drive speed is changed to the second drive speed at the time of yarn splicing. Then, the injection air pressure of the air spinning nozzle is changed to a pressure lower than that during normal spinning, and thereafter, in response to the drive speed again changing from the second drive speed to the first drive speed, Since the air pressure of the air spinning nozzle is changed to the air pressure during normal spinning, the amount of slack in the yarn can be suppressed while maintaining the tension of the yarn during yarn splicing, and even if the yarn feed speed changes. The energy of the jetting air applied per unit length of the spun yarn can be kept constant, and the torque of the yarn and the number of fluffs can be made almost the same as those during normal spinning. Therefore, it is possible to prevent the occurrence of uneven dyeing at the yarn spliced portion.

[Brief description of drawings]

FIG. 1 is an arrangement configuration diagram of each device of a spinning device according to a first embodiment.

FIG. 2 is a front view of the spinning device, showing how many spinning units 1 are arranged in parallel.

FIG. 3 is a side sectional view showing a pneumatic spinning unit 5.

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

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a diagram showing an acceleration / deceleration pattern of a yarn feeding speed of each device.

FIG. 7 is an arrangement configuration diagram of each device of the spinning device according to the second embodiment.

FIG. 8 is a block diagram showing a configuration of a first switching mechanism 27.

FIG. 9 is a diagram showing a pressure increase / decrease pattern of the air pressure injected from the air spinning nozzle 19.

FIG. 10 is an arrangement configuration diagram of each device of the spinning device according to the third embodiment.

FIG. 11 is a block diagram showing a configuration of a first switching mechanism 127.

FIG. 12 is a view showing a pressure increase / decrease pattern of the injection air pressure of the air spinning nozzle 19.

[Explanation of symbols]

1 Spinning Unit 4 Draft Device 8 Winding Means 17 Delivery Roller (Yarn Feeding Means) 18 Slab Catcher (Yarn Defect Detection Section) 19 Air Spinning Nozzle (Spinning Nozzle) 20 Hollow Guide Shaft 25/26/35/44 Motor 27 First Air pressure switching means 31, 32, 33, 36, 46 Lower controller (control device) 55 Auxiliary nozzle 64 Upper controller (control device)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D01H 13/22 D01H 13/22 (72) Inventor Kenji Baba 136 Takeda Mukoyo-cho, Fushimi-ku, Kyoto Murata Machinery Machinery Co., Ltd.Headquarters factory (72) Inventor Toshio Nishikawa 136 Takeda Mukoyo-cho, Fushimi-ku, Kyoto Murata Machinery Co., Ltd. Headquarters factory (72) Inventor Katsuya Tanaka 136 Takeda Mukoyo-cho, Fushimi-ku, Kyoto Murata Machinery Kikai Co., Ltd. Headquarters factory F-term (reference) 4L056 AA19 BD12 DA20 EA04 EA13 EA25 EA41 EB18 EC05 EC85

Claims (9)

[Claims] 1. A draft device, an air spinning portion, a yarn feeding means for feeding the yarn spun from the air spinning portion, and a winding means. The air spinning portion includes a hollow guide shaft body and a hollow guide. A spinning device equipped with an air spinning nozzle that generates a swirling airflow around the yarn feeding upstream end of the shaft, and an auxiliary nozzle that generates a swirling airflow in the yarn passage of the hollow guide shaft, the drafting device comprising: A control device is provided for switching the drive speeds of the yarn feeding means and the winding means between a first drive speed during normal spinning and a second drive speed during yarn splicing that is lower than the first drive speed. A spinning device characterized by: 2. A yarn defect detecting unit for detecting a yarn defect is provided on the yarn path, and the control device switches between a first driving speed and a second driving speed based on a detection result of the yarn defect detecting unit. The spinning device according to claim 1, wherein: 3. An air pressure switching control device is provided for controlling the injection air pressure of the swirling air flow of the air spinning nozzle to be increased / decreased in response to changes in the driving speed of the draft device, the yarn feeding device, and the winding device. Claim 1 or Claim 2 characterized by
The spinning device described in 1. 4. The spinning according to claim 3, further comprising switching means for continuously changing the air pressure of the pneumatic spinning nozzle, wherein the driving of the switching means is controlled by the air pressure switching control device. apparatus. 5. The spinning according to claim 3, further comprising switching means for changing the air pressure of the pneumatic spinning nozzle in a stepwise manner, and driving of the switching means is controlled by the air pressure switching control device. apparatus. 6. The weight according to claim 1, wherein a plurality of weights including the draft device, the yarn feeding means, and the winding means are provided, and the speed can be controlled individually for each weight. The spinning device according to any one of 5 above. 7. The spinning device according to claim 1, wherein during the yarn splicing, the drive speed is set to the second drive speed,
A spinning method wherein the first driving speed is set again when the yarn splicing is completed. 8. The spinning device according to claim 2, wherein when a yarn defect is detected, the drive speed is set to a second drive speed, and when the yarn splicing is completed, the drive speed is set to the first drive speed again. Characteristic spinning method. 9. The spinning device according to claim 3, wherein during the yarn splicing, the air speed is reduced in response to the drive speed decelerating and changing from the first drive speed to the second drive speed. The air pressure of the spinning nozzle is changed to a pressure lower than that during normal spinning, and then the air velocity of the air spinning nozzle is changed in response to the drive speed changing from the second drive speed to the first drive speed again. A spinning method characterized in that the air pressure is changed to the air pressure during normal spinning.