JPH10297832A - Untwisting nozzle of piecing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the untwisting property of a thread in an untwisting nozzle by forming a part in contact with a thread end absorbed in a suction port of the untwisting nozzle in such a way that the stress which acts on the thread end is dispersed. SOLUTION: An untwisting nozzle 1 consists of a suction port 5 which absorbs untwisted thread ends, a nozzle 4 which jets air from an air supply source to generate a turning stream of air, and a nozzle space 7 which untwists thread ends. The suction port 5 and the nozzle space 7 are brought in contact mutually and continuously. An inside diameter of an opening end of the suction port 5, namely, a thread contact face 6 with which the absorbed thread comes in contact, is curved in such a manner that a thread end absorbed into the nozzle space 7 is not bent in its middle and is not bent at a sharp angle. Moreover, a surface of the thread contact face 6 is smooth so that a thread can turn freely. For this reason, the twisting in the direction of untwisting does not stop on the thread contact face 6 and is continuously transmitted to the thread ends by turning the thread ends to untwist the thread ends up to the upstream from a section where the thread ends come in contact with the thread contact face 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an untwisting nozzle of a yarn splicing device which sucks a yarn end by a suction flow and untwists the yarn end by a swirling flow. For example, the present invention is applied to a yarn joining device in which two yarn ends are untwisted by an untwisting nozzle, and the untwisted yarn ends are joined by a yarn joining nozzle.

[0002]

2. Description of the Related Art FIG. 6 shows a yarn splicing apparatus to which a conventional untwisting nozzle 1 of this kind is applied. The yarn splicing device 3 sucks and introduces the cut yarn end Y, and connects the untwisted nozzle 1 for untwisting with the swirling force of air in the nozzle space 7 inside the yarn end Y to the untwisted yarn end Y. And a yarn splicing nozzle 2 for joining. The untwisting nozzle 1 is provided with an air injection hole 4 in a nozzle space 7 for generating a suction flow and a swirling flow. At a portion where the yarn end Y sucked from the suction port 5 of the untwisting nozzle 1 comes into contact, a corner 29 bent at a right angle is provided so that the yarn end Y comes into contact at one sharp point. This is similar to the case where the sucked yarn end Y is bent at the corner 29 of the suction port 5 and the yarn is gripped at the broken position, and the propagation of the twist is stopped at the broken position. The area from the tip of Y to the contact portion with the corner 29 is defined as the untwisting range 28 and the yarn Y
Was sufficiently untwisted.

[0003]

However, the splicing of a strongly twisted yarn having a long fiber length such as wool and a tight twist is very difficult to untwist sufficiently to obtain high quality as a seam. Had been a problem since. Simply thinking, if untwisting is insufficient, for example, a method of adjusting only the air injection time comes to mind, but if the injection time is lengthened, twisting in the opposite direction due to excessive untwisting will occur. In many cases, the untwisted state is obtained as a result, and the strength is weak when the seam is thick, so that a high quality yarn splicing satisfying the appearance and the strength cannot be easily obtained.

In addition, since the yarn introduced into the untwisting nozzle is sucked in a state where the yarn is bent at the corner of the suction port, the so-called strong strain yarn such as a strongly twisted yarn has a moderate stress during untwisting. You will concentrate on the broken part. For this reason, when the untwisting is completed and the supply of air to the untwisting nozzle is stopped, the stress stored in the broken part is instantaneously released, and a large number of fiber bundles are twisted. In addition, the repulsive force of the yarn itself is applied, and the yarn jumps out of the suction port. In the worst case, the yarn jumps out of the yarn splicing nozzle, and the yarn splicing cannot be performed. .

The present invention has been made by paying attention to such problems existing in the prior art. The challenge is
An object of the present invention is to provide an untwisting nozzle which is excellent in the untwisting property of a yarn at the untwisting nozzle and is used for a yarn splicing device in which yarn spatter is less likely to occur.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a portion of the suction port of the untwisting nozzle, which comes into contact with the sucked yarn end, acts on the yarn end. In which the applied stress is dispersed.

According to the second aspect of the present invention, at the suction port of the untwisting nozzle, the portion where the sucked yarn end comes into contact has a shape in which the contacting yarn end is curved. According to the third aspect of the present invention, a portion of the suction port of the untwisting nozzle where the sucked yarn end comes into contact has a curved surface.

According to the first aspect of the present invention, at the suction port of the untwisting nozzle, the portion where the sucked yarn end comes into contact is
By dispersing the stress acting on the yarn end, it is possible to prevent the sucked yarn end from bending at the corner of the suction port and stopping the propagation of twist. Since the twist propagation increases, the fiber bundles constituting the yarn are untwisted to an appropriate length, the fibers are cut and spun by the swirling air to promote the untwisting, and the amount of untwisted fibers is moderated. I do. By controlling the amount of fibers to an appropriate amount, the swirling flow sufficiently acts on the fiber bundle. In addition, since the propagation of twist increases, at the suction port, at the portion where the sucked yarn end comes into contact, the fiber is defibrated and becomes substantially parallel, the repulsive force of the yarn itself is weakened, and the yarn splash is less likely to occur. .

According to the second aspect of the present invention, the portion where the suctioned yarn end of the suction nozzle comes into contact is formed into a shape in which the contacted yarn end is curved, so that the yarn end rolls at the suction port. Act like so. According to the third aspect of the present invention, the portion where the yarn end sucked into the suction port of the untwisting nozzle is in contact with the curved surface has a curved surface, so that the sucked yarn end easily rolls and the yarn end. The contact area between the wire and the suction port increases, and the yarn being untwisted is stabilized.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A yarn splicing device 3 provided with an untwisting nozzle 1 according to the present embodiment is mainly used for a winding unit 23 of a winder. Winder winding unit 2
3 will be described with reference to FIG. Winding unit 23
Is a machine that supplies a spinning bobbin B and removes yarn defects of the yarn wound on the spinning bobbin B, repeats splicing, and rewinds the yarn from a plurality of bobbins B into one large package P. The configuration of the winding unit 23 will be described below. The winding unit 23 untwists the two yarn ends by an air flow, entangles the untwisted yarn ends by an air flow, and splices the two yarns. A yarn clearer 24 that detects and cuts the yarn is provided. In addition, a tensioner 16 which is a device for applying tension when the yarn Y is wound up, and a balloon which is a device for suppressing a balloon of the yarn Y unwound from the bobbin B and suppressing a rapid change in the yarn tension. A breaker 26, a suction mouth 21 connected to a suction device (not shown) and provided with a suction port at the tip thereof, and a yarn end Y on the bobbin B side connected to the suction device (not shown) during splicing. A splicing pipe 20 which is a hollow member that is sucked together and introduced into the yarn path of the yarn joining device 3, a yarn trap 30 that sucks and holds the yarn end Y cut by the yarn clearer 24, and a main body frame 7. I have. From the yarn supplying bobbin B side to the package P side, a balloon breaker 26, a tensor 2
5, the yarn trap 30, the yarn clearer 24, the yarn joining device 3, and the package P are sequentially arranged from the downstream side.

The suction port of the suction mouth 21 is usually located between the tensor 25 and the yarn clearer 24. At the time of splicing, the arm 11 pivots to move to the vicinity of the package P, and sucks the yarn end Y of the package P. It has become. The suction port of the relay pipe 20 is provided with the normal package P.
In the middle of the piecing operation, the splicing pipe 20 turns to move to a position near the upper portion of the balloon breaker 26 at the time of piecing, and sucks the yarn end Y sucked and held by the yarn trap 30. .

The yarn splicing device 3 comprises a untwisting nozzle 1 for sucking the yarn end Y and untwisting the yarn end by the action of a swirling flow of air in a nozzle space 7 provided therein; A yarn splicing nozzle 2 is provided which entangles the yarn ends with each other by the action of a swirling air flow and connects the yarn ends. Yarn joint hole 8
And the untwisting nozzle 1 is arranged above and below the yarn joining nozzle 2 so as to be symmetrical to the yarn joining hole 8. Further, as shown in FIG. 1, the suction port 5 of the untwisting nozzle 1 protrudes from the installation surface 9 of the yarn splicing nozzle 2 toward the yarn splicing hole 8. As shown in FIG. 2, a U-shaped holding member 22 for holding the yarn Y introduced into the yarn joining hole 8 is provided so as to act between the yarn joining nozzle 2 and the untwisting nozzle 1. The yarn guides 10 and 11 are provided outside the yarn guides.
Are provided. Outside the yarn guides 10 and 11, a yarn guide 1 is provided.
A thread pulling lever 27 for pushing the thread Y into 0 and 11 is provided. Then, the untwisting nozzle 1 and the yarn guide 10,
Cutters 16 and 17 are provided between 11 and
Clamping devices 18 and 19 are provided between the yarn pulling lever 27 and the yarn guides 10 and 11.

Operation of the winding unit 23 and the yarn joining device 3
The operation of is described below. First, the winding unit 2
As for the operation of No. 3, the yarn Y unwound by the bobbin B suppresses a sudden change in the unwinding tension by the balloon breaker 26, imparts a tension for winding by the tensor 25, and The film is wound around the package P while detecting the presence or absence of a yarn defect such as unevenness in the thickness of the yarn. When a yarn defect is detected by the yarn clearer 24, the yarn defect is removed by suction, the yarn Y is spliced by the yarn joining device 3, and the winding is continued until the yarn defect is detected. The above operation is repeated to complete one package P from the plurality of bobbins B.

When a yarn defect is detected by the yarn clearer 24, the yarn clearer 24 operates to cut the yarn Y. The cut yarn Y on the downstream side is captured by the yarn trap 30. The yarn Y on the upstream side (the yarn on the package side) is wound around the package P. Then, the suction mouth 21 is turned, the suction port is brought close to the package P, and the yarn P on the upstream side is sucked while the package P is rotated in the reverse direction, and the suction mouth 21 is turned in the opposite direction to the turning direction to make the yarn clearer. Return the suction port to below 24. Next, the splicing pipe 20 is swirled up to above the balloon breaker 26, and while the yarn Y on the downstream side is sucked at the suction port, the splicing pipe 20 is swung in a direction opposite to the direction in which the splicing pipe 20 is swirled, and the suction port is lowered to the package P. Back.

Intermediate pipe 20 and suction mouth 2
Assuming that the yarn Y sucked in 1 is Yp on the package P side and Yb on the bobbin B side, the yarns Yp and Yb are gripped by the clamp devices 18 and 19 and the yarn splicing device 3 performs the yarn splicing.
One of the grasped yarns Yp and Yb is transferred to the yarn guides 10 and 1 by the yarn pulling lever 27.
The first and second yarns Yb are guided and inserted into the guide grooves 13 and 14 and the yarn splicing hole 8, and the other yarn Yb is also guided and inserted into the guide grooves 15 and 16 and the yarn splicing hole 8.
Yb is pressed and fixed to the yarn splicing hole 8. Next, each yarn Yp, Y
b is cut by the cutters 16 and 17 and the yarn is loosened by returning the yarn pulling lever 27, and the cut yarn end is sucked into the untwisting nozzle by the suction airflow of the untwisting nozzles 1 and 1. It is untwisted by the swirling force of the air injected in the direction opposite to the twist. After the untwisting process, when the yarn pulling lever 27 is operated again, the untwisted yarn ends are pulled out from the untwisting nozzles 1 and 1, and both yarn ends are in the yarn splicing holes 8 of the yarn splicing nozzle 2. Superimposed. In this state, the overlapped portion of the two yarn ends is entangled by the action of the compressed fluid by the swirling flow of air, including the untwisted portion in the yarn joining hole 8, to form a single yarn. Done.

The untwisting nozzle 1 of the present embodiment used in the yarn joining device 3 will be described in detail with reference to FIGS. The untwisting nozzle 1 of the present embodiment includes a suction port 5 for sucking a yarn end Y to be untwisted, a nozzle hole 4 for ejecting air from an air supply source (not shown) to create a swirling flow, and a yarn end Y. A suction space 5 and a nozzle space 7
Are connected continuously. A nozzle hole which is formed at a predetermined distance on the suction port 5 side of the nozzle space 7 on the side opposite to the suction port 5 and which is obliquely opened so that air is jetted in a direction opposite to the twisting direction. 4 is provided, and the air jetted from the nozzle hole 4 generates a swirling flow in the nozzle space 7 in the direction opposite to the twist. At the inner diameter of the open end of the suction port 5, the yarn contact surface 6 with which the sucked yarn Y contacts is curved so that the yarn end Y sucked to the nozzle space 7 does not bend in the middle and does not bend at a steep angle. And the surface is smooth and the yarn Y
Is rolling freely.

When air is injected from the nozzle hole 4 in the direction opposite to the twist, the air generates a swirling flow in the nozzle space 7 and generates a negative pressure in the vicinity of the suction port 5. The action works. By this suction action, the yarn Y
Is introduced into the untwisting nozzle 1. Thread end Y introduced
Starts to be untwisted in the nozzle space 7 due to the swirling flow of air. The twist in the untwisting direction due to the swirling flow propagates to the yarn end Y, whereby the untwisting proceeds, and reaches the portion in contact with the yarn joining surface 6. The yarn contact surface 6 is smooth,
Is curved. For this reason, the twist in the untwisting direction does not stop at the yarn joining surface 6, but continues to propagate to the yarn end Y by rotating and rolling the yarn end Y, so that the yarn is upstream from a position in contact with the yarn joining surface 6. Untwist the yarn end Y to the side. In particular, since the shape of the yarn joining surface 6 of the present embodiment is curved,
Not only does the sucked yarn end Y bend reliably, but also the yarn end Y
The contact area between the thread end and the yarn joining surface 6 is increased, so that the yarn end Y is stabilized at each moment of contact, and is reliably untwisted.

That is, the range of twist propagation (untwisting range 28) due to the swirling flow is widened. In other words, the untwisting does not stop abruptly at the yarn-attaching surface 6 and the fibrillation is smoothly performed in a stepwise manner, so that the stress generated by the untwisting is dispersed and does not concentrate on one place of the yarn end Y. Has become. As a result,
This is because the thread splash is less likely to occur.

Further, by expanding the untwisting range 28, the yarn Y having a long fiber length can be sufficiently untwisted without only a part of the fiber length being untwisted. Untwisting in which the fibers are cut by the swirling flow occurs, the number of fibers constituting the yarn Y decreases, and the effect of the swirling flow is sufficiently transmitted. As a result, the entanglement between the fibers is strengthened, whereby the seam is strengthened, and the number of entangled fibers is reduced, so that the seam can be prevented from becoming thick.

In order to widen the untwisting range 28, it is important that the propagation of twist of the sucked yarn Y is not hindered on the way. Ideally, the yarn Y draws a smooth curve from the yarn splicing hole 8 to the nozzle space 7, but at least the yarn end Y comes into strong contact with one location and bends ( It is necessary that there is no stress concentration at the yarn end Y, such as a middle bend. For this purpose, it is necessary that at least the shape of the yarn contact surface 6 where the yarn ends Y are in contact with each other and stress concentration easily occurs is such that the stress acting on the yarn Y is dispersed. Then, it is preferable that the surface is made smooth and the yarn Y rolls freely.

In order to prevent stress concentration at the yarn end Y, it is preferable that the yarn end surface 6 has a shape in which the yarn end Y is curved. For example, it is preferable to form a step as shown in FIG. And when it is made into a step shape as shown in FIG.
It is preferable to round the corner at the end of the stairs because the stress concentration of the yarn Y is prevented and the rolling of the yarn Y is facilitated.

In order to form the threading surface 6 as shown in FIG. 4, the processing becomes complicated and the production cost is increased. Curving as shown in FIG. 3 is preferable from the viewpoint of manufacturing the untwisting nozzle 1. The contact area between the yarn end Y and the yarn surface 6 increases by bending the yarn surface 6 as well as in manufacturing,
At each moment when the yarn end Y is in contact, the yarn end Y is stabilized and untwisted reliably. The range in which the shape of the yarn joining surface 6 is curved is at least a portion where the yarn Y actually contacts the suction port 5.

Depending on the type of the yarn Y, the so-called strong yarn Y is difficult to be sucked by the untwisting nozzle 1. Therefore, it is preferable to increase the suction force by bringing the suction port 5 closer to the yarn path. For this reason, as shown in FIG.
It is preferable to change the height of the suction port 5 by changing the width of the suction port 5 so that the suction port 5 can be brought closer to the yarn path, because it can be easily performed. Of course, it is preferable to prepare a plurality of untwisting nozzles 1 having different widths of the curved portion 31 and replace them according to the type of the yarn Y.

[0024]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, at the suction port of the untwisting nozzle, the portion where the sucked yarn end comes into contact is formed into a shape in which the stress acting on the yarn end is dispersed, thereby providing the yarn end. Since the propagation of untwisting from the fiber increases, the fiber bundle constituting the yarn is untwisted to an appropriate length, and the fiber is cut by the swirling flow of air,
Accelerates scattered untwisting and makes the amount of untwisted fibers moderate. By adjusting the amount of fibers to an appropriate amount, the swirling flow sufficiently acts on the fiber bundle, and a good seam can be formed. Further, since the propagation of twist increases, the fibers are defibrated and become substantially parallel, the repulsive force of the yarn itself is weakened, and the yarn is less likely to splash. As a result, it is possible to provide an untwisting nozzle of a yarn splicing device which is excellent in untwisting property of the yarn and hardly generates a yarn spatter that the yarn jumps out of the untwisting nozzle.

According to the second aspect of the present invention, the portion of the suction port with which the suctioned yarn comes into contact is formed into a shape in which the yarn end is curved, so that the rolling of the yarn end is facilitated, and the yarn end is released. The twisting range can be expanded.

According to the third aspect of the present invention, the portion where the drawn yarn end comes into contact with the suction port of the untwisting nozzle has a curved surface, so that the drawn yarn end easily rolls. This increases the contact area between the yarn end and the suction port, and stabilizes the yarn during untwisting. As a result, the yarn end is reliably untwisted, and the success rate of the yarn splicing is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a yarn splicing device using the untwisting nozzle of the present invention.

FIG. 2 is a schematic view of a winding unit of a winder in which a yarn joining device is used.

FIG. 3 is a sectional view of a main part of the untwisting nozzle of the present invention.

FIG. 4 is a sectional view of a main part of another embodiment of the untwisting nozzle of the present invention.

FIG. 5 is a cross-sectional view of a main part of a yarn joining device using an untwisting nozzle according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main part of a yarn splicing device using a conventional untwisting nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Untwisting nozzle 3 Yarn splicing device 5 Suction port 6 Yarning surface (the part where the sucked yarn end contacts)

Claims (3)

[Claims] In a untwisting nozzle of a yarn splicing device for sucking a yarn end by a suction flow and untwisting the yarn end by a swirling flow, a portion where the sucked yarn end comes into contact with a suction port of the untwisting nozzle. ,
An untwisting nozzle for a yarn joining device, wherein a stress acting on a yarn end is dispersed. 2. The untwisting nozzle of the yarn splicing apparatus according to claim 1, wherein a portion of the suction opening of the untwisting nozzle where the sucked yarn end contacts is formed into a shape in which the contacting yarn end is curved. 3. The untwisting nozzle of the yarn splicing device according to claim 2, wherein a portion of the suction port of the untwisting nozzle, which comes into contact with the sucked yarn end, has a curved surface.