JPH0461097B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a yarn splicing method for a binding spinning device,
Specifically, two nozzles that generate swirling flows in opposite directions are provided at a steady spinning position close to the front roller of a drafting device, and a space is provided between the two nozzles for the exhaust discharge of a first nozzle disposed on the upstream side. The present invention relates to a yarn splicing method for a binding spinning device arranged in a state in which the yarn is spun.

(Prior art) In a binding and spinning device, untwisted ribbon-shaped fiber bundles continuously supplied from a draft device are introduced into a twisting nozzle, and twisted and untwisted by air swirling flow within the twisting nozzle. A bundled spun yarn is produced by applying this process, and it has been attracting attention in recent years because it can be spun at high speeds of over 100 m/min. Incidentally, yarn splicing in binding and spinning devices is generally performed by knotting, in which yarn ends are tied together in a knot, or piecing, in which yarn and fiber bundles are intertwined. Knotting creates knots in the knotted thread, and the cut end of the thread protrudes from the thread.
This causes troubles in the operation of knitting machines and looms, such as getting caught in yarn guides and yarn feeding members in subsequent processes of knitting machines and the like. Therefore, piecing is better, but in order to carry out piecing with the above-mentioned binding and spinning apparatus, it is necessary to unwind the ends of the completed yarn from the package and feed it back through the twisting nozzle. In order to send the yarn ends backward through the twisting nozzle in this way,
Publication No. 11 of Jikko No. 56-42374 published on the 3rd of May.
As shown in the figure, an air injection hole 50a that injects air in the yarn running direction and generates a swirling airflow, and an air injection hole 50a that injects air in the opposite direction to the yarn running direction and generates a swirling airflow. It is disclosed that the hole 50b is formed inside one twisting nozzle 50. In this twisting nozzle, the thread passage is continuous from the inlet to the outlet, and the thread can be threaded smoothly from the outlet to the inlet of the twisting nozzle 50.
However, since the air injection hole 50b for yarn reverse feeding is formed in the same nozzle, not only does the structure of the twisting nozzle become complicated, but also fiber clogging occurs in the air injection hole 50b for reverse feeding during steady spinning. There is also a risk of Moreover, the internal volume of the twisting nozzle 50 is expanded by the air injection hole 50b for reverse feeding, which tends to cause problems such as air diffusion and pressure fluctuation during steady spinning.

On the other hand, in order to obtain a bound spun yarn with high yarn strength, two things are important: increasing the number of bound fibers and tightly winding the bound fibers around the core fibers at a large twist angle. However, it is very difficult to satisfy these two conditions with one twisting nozzle. In other words, in order to increase the number of bundled fibers, it is necessary to prevent the twist applied to the fiber bundle from reaching near the nip point of the front roller. If a greater twist is applied to the fiber bundle for winding, the twist will be traced back to near the nip point of the front roller. In order to solve this problem and fully enhance the cohesive effect, for example,
As disclosed in Japanese Patent No. 52-50293, a twisting nozzle consisting of two blocks divided along the yarn path and spaced apart from each other has been used. However, in such a twisting nozzle, the two blocks are far apart, so even if suction is applied from the nozzle inlet side using the suction means during yarn splicing, the suction force is significantly reduced due to the gap between the blocks, and the yarn may be fed backwards. There is a problem that thread splicing cannot be performed smoothly. The above-mentioned Japanese Utility Model Publication No. 56-42374 discloses that when the twisting nozzle is constituted by two twisting nozzles 50 each having an air injection hole 50b for reverse feeding as shown in FIG. A method has been proposed in which one of the twisting nozzles 50 is moved in the out position to connect the yarn passages and air is jetted from the air injection hole 50b to thread the yarn.
However, the gap between both nozzles in the steady spinning state must be kept strictly constant because it has a subtle effect on the spinning action, and if one nozzle is moved during threading, it must be kept at the predetermined steady spinning position. It is necessary to return it mechanically and forcibly, making the mechanism complicated.

(Problems to be Solved by the Invention) In order to increase the bundling effect, this invention consists of a twisting nozzle consisting of two nozzles, and in a steady spinning position, both nozzles are arranged between the two nozzles on the upstream side. This solves the problem that in a binding spinning device that is arranged with a gap for exhaust discharge from one nozzle, it is difficult to feed the yarn back into the twisting nozzle during yarn splicing.

Structure of the Invention (Means for Solving the Problems) As a means for solving the above-mentioned problems, in this invention, two nozzles that generate swirling flows in opposite directions are placed close to the front roller of the drafting device. In a binding spinning device in which a space is provided between both nozzles for emitting exhaust gas from a first nozzle disposed on the upstream side at a steady spinning position,
At the time of yarn splicing, a suction means is applied to the inlet of the first nozzle, and a blowing means is applied to the outlet of the second nozzle, which is discharged downstream, so that the end of the yarn connected to the package is connected to the second nozzle. 1st from the exit
A configuration is adopted in which the suction means and the blowing means are operated simultaneously until the yarn end is led out to the inlet of the nozzle and at least until the yarn end is led out to the inlet of the second nozzle.

(Function) In the present invention, threading is performed with the exhaust gas release space provided to enhance the bundling effect left open without being blocked. The suction means acting on the inlet of the first nozzle and the blowing means acting on the outlet of the second nozzle are operated simultaneously until the end of the thread connected to the package is led out to the inlet of the second nozzle. let Since the passage of the second nozzle becomes narrower toward the inlet, if the blowing means is only applied to the outlet, the air blown from the outlet will flow backwards and the yarn end will not be led out to the inlet. By applying the blowing means to the outlet of the second nozzle and simultaneously applying the suction means to the inlet of the first nozzle, the action of the suction means extends to the inlet of the second nozzle, and the suction means acts on the outlet of the second nozzle. The air flow blown into the outlet of the second nozzle from the acting blowing means is promoted to flow into the inlet. Then, the yarn end rides on this incoming airflow and is guided to the inlet of the second nozzle. The thread end is the second
After passing through the nozzle, the blowing means stops. The yarn end is smoothly led out from the outlet of the first nozzle to the inlet by the suction action of the suction means acting on the inlet of the first nozzle.

Example 1 A first example embodying this invention will be described below as a first example.
This will be explained according to Figures 6 to 6. As shown in Fig. 1, each binding spinning device has a pair of cross rollers 1,
A twisting nozzle 4 is arranged above a draft device consisting of a middle apron 2 and a front roller 3,
The yarn Y, which is spun as a bundled spun yarn through the twisting and untwisting actions of the twisting nozzle 4, passes through a pull-out roller 5 and a traversing drum 6, and then is placed in a package on a bobbin B rotatably supported by a cradle arm 7. P
It is now being rolled up as a. The twisting nozzle 4 is a first nozzle 8 that generates swirling flows in mutually opposite directions.
and a second nozzle 9, which are arranged in a steady spinning position close to the front roller 3 of the drafting device, with a wedge-shaped space S for discharging the exhaust from the first nozzle 8 provided between both nozzles. . 1st
As shown in FIG. 3, the nozzle 8 has a thread passage consisting of a small diameter inlet part 8a, a large diameter hole part 8b, and an outlet part 8c, which are continuously formed from the front roller 3 side (upstream side) to the downstream side. A large diameter hole 8b is formed.
has an air injection hole 11 whose one end communicates with the air storage chamber 10.
is inclined in a direction that promotes the advancement of the yarn Y and has a large diameter hole 8.
It is opened eccentrically so as to generate a swirling flow in b. The second nozzle 9 disposed on the downstream side has a small-diameter inlet portion 9a formed at a position facing the outlet portion 8c of the first nozzle 8, and a large-diameter hole portion 9b and an outlet toward the downstream side. The portion 9c is continuously formed and constitutes a thread passage. The large diameter hole 9b has an air injection hole 13 that communicates with the air storage chamber 12 at one end.
The first nozzle 8 is inclined in a direction that promotes the advancement of the
The opening is eccentric to create a swirling flow in the opposite direction. In order for the air flow injected into the large-diameter hole portion 9b to form a swirling flow that effectively twists the yarn Y, the diameter of the air injection holes 13 should be made small and 3 to 7 holes should be formed. , and each air injection hole 1
It is preferable that the air injection holes 13 are opened in a tangential direction to the wall surface of the large diameter hole 9b so that the air flow is injected from 3 along the wall surface of the large diameter hole 9b as much as possible. The twisting nozzle 4 can slide along a pair of guide rods 14 extending along the longitudinal direction of the machine base while being fitted into the first nozzle 8 and the second nozzle 9, respectively. is supported by. As shown in FIGS. 3 to 6, the injection nozzle 15 as a blowing means that acts during threading has a nozzle body 16 formed with an injection hole 16b that is inclined in a direction that promotes the advancement of the thread with respect to the thread path 16a. Compressed air supply section 1 that supplies compressed air to each injection hole 16b
7, and as shown in FIG. 6, a thread removal opening 18 is formed on the opposite side (left side in FIG. 6) of the retraction direction of the injection nozzle 15 to communicate the thread passage 16a with the outside.

Next, the operation of the apparatus configured as described above will be explained. During steady spinning, the fiber bundle (fleece) F is drafted to a predetermined magnification by a draft device and continuously supplied to the twisting nozzle 4, where it is twisted and untwisted to produce a bundled spun yarn Y. The package is then wound onto a bobbin B as a package P via a pull-out roller 5 and a traverse drum 6. Since the exhaust gas from the first nozzle 8 is discharged to the outside from the space S, the exhaust gas from the first nozzle 8 does not enter the inlet portion 9a of the second nozzle 9 and obstruct the action of the second nozzle 9. The action of the twisting nozzle 4 is sufficient to make the yarn Y
In addition to this, the bundling effect is enhanced and a tied spun yarn with high yarn strength is produced.

When the yarn Y is cut during spinning, the clade arm 7 supporting the package P is pushed up by a push-up mechanism (not shown) to separate the package P from the traversing drum 6. On the other hand, the back roller 1 of the draft device immediately stops, and the other rollers continue to rotate to cut the fiber bundle F between the back roller 1 and the middle apron 2. Next, by operating the yarn end pick-up mechanism while reversing the package drive roller of the yarn splicing device, the yarn end wound around the package P is pulled out, and the piecing roller 19
grip by. Further, the injection nozzle 15 is positioned directly above the outlet portion 9c of the second nozzle 9. Next, the twisting nozzle 4 is moved along the axial direction of the front roller 3 to the threading position together with the piecing roller 19 and the injection nozzle 15, as shown by the chain line in FIG. The twisting nozzle 4 is guided by a guide rod 14 and moves in parallel while maintaining its posture at the steady spinning position. This movement creates a space below the twisting nozzle 4, that is, on the inlet side of the first nozzle 8, into which a yarn end suction tube 20 having a known structure can enter.

Then, with the twisting nozzle 4 moved to this threading position, the yarn end suction tube 20 is joined to the inlet of the first nozzle 8 as shown in FIG. are operated simultaneously for a predetermined period of time. The yarn passage of the second nozzle 9 is an inlet portion 9a.
Since the side is narrower, the injection nozzle 15
When only the second nozzle is operated, the air flow injected from the injection nozzle 15 flows backward from the outlet part 9c, and the yarn end is not introduced into the second nozzle 9. However, by operating the yarn end suction pipe 20, the suction effect is reduced. Second nozzle 9
from the injection nozzle 15 to the inlet part 9a of the
The air blown into the outlet 9c of the nozzle 9 is promoted to flow into the large diameter hole 9b and the inlet 9a. Therefore, by simultaneously operating the injection nozzle 15 and the yarn end suction tube 20, an air flow is generated that flows into the yarn path of the second nozzle 9 from the outlet section 9c side to the inlet section 9a side, and is sent by the piecing roller 19. The yarn end is smoothly inserted into the yarn passage of the second nozzle by the incoming air flow. When the yarn end passes through the second nozzle 9, the operation of the injection nozzle 15 is stopped and only the yarn end suction tube 20 is activated. The yarn end passed through the second nozzle 9 and led out to a position corresponding to the outlet section 8c of the first nozzle 8 is moved from the outlet section 8c of the first nozzle 8 to the entrance section 8a by the suction action of the yarn end suction tube 20.
It is inserted smoothly. When threading is completed, the injection nozzle 15 moves to the second position as shown by the chain line in FIG.
It is evacuated from the position corresponding to the outlet part 9c of the nozzle 9. At this time, the yarn Y inserted into the yarn passage 16a of the injection nozzle 15 passes through the yarn removal opening 18, so the yarn Y inserted into the twisting nozzle 4 will not be pulled out when the injection nozzle 15 moves to retreat. do not have. Next, after the yarn end is cut to a fixed length, the twisting nozzle 4 and the yarn end suction tube 20 are moved to the steady spinning position, whereupon the yarn end is guided to the nip point of the front roller 3 and joined to the fiber bundle F in the drafting device. Thread splicing is performed in a predetermined motion.

Embodiment 2 Next, a second embodiment will be described with reference to FIGS. 7 and 8. In this embodiment, the first nozzle 8 and the second nozzle 9 constituting the twisting nozzle 4 are arranged so that the yarn passage formed therein is bent at a certain angle in a plane perpendicular to the axis of the front roller 3. This embodiment differs from the previous embodiment in that it is integrally formed and in the structure of the blowing means. The blowing means includes an arc-shaped compressed air supply pipe 21 that is open on the side opposite to the retreating direction, and a plurality of blowing pipes 2 branched from the compressed air supply pipe 21.
It is composed of 2. When the blowing means is composed of the compressed air supply pipe 21 and the blowing pipe 22, the structure is simpler than that of the injection nozzle 15 of the previous embodiment, and the thread removal process 18 is not required. can be done reliably. or,
When both nozzles 8 and 9 are in a bent state,
Since the yarn Y runs while rubbing against the inner wall surface of the entrance portion 9a of the second nozzle 9, the twist applied to the yarn Y by the second nozzle 9 is prevented from propagating to the first nozzle 8 side, and The swirling flow from the nozzle 8 flows through the second nozzle 9
The binding effect at the second nozzle 9 acts in the direction of untwisting the fiber bundle to reduce the number of twists in the central fiber bundle, and promotes the derivation of fibers with one end free, which is not twisted into the central fiber bundle. is significantly increased. In this embodiment, as in the previous embodiment, when threading for thread splicing, the twisting nozzle 4 is moved laterally to the threading position, and the thread end suction tube 2
and the blowing means are operated at the same time, and the yarn end is led out to the inlet end of the second nozzle 9, and then the yarn end suction tube 20
The needle is operated and threading is performed smoothly in the same manner as described above.

Note that the present invention is not limited to the above-mentioned embodiments. For example, as shown in FIG. The yarn end suction tube 20 may be connected to the inlet of the first nozzle 8 from within the gap spaced apart from the front roller to perform threading. Further, as shown in FIG. 10, it is also possible to arbitrarily change the shape, structure, etc. of each part without departing from the spirit of the invention, such as by arranging a large number of blowing pipes 23 in parallel as blowing means.

Effects of the Invention As detailed above, according to the present invention, at the steady spinning position, the space S formed between both nozzles is
Since the exhaust gas from the first nozzle is smoothly discharged from the nozzle, it is possible to sufficiently enhance the bundling effect during steady spinning without adversely affecting the operation of the second nozzle. To easily and reliably perform yarn splicing work by applying a blowing means and a suction means from the outside to smoothly and reliably insert the yarn end connected to the package into the yarn passage of a twisting nozzle. In addition to this, the device for threading the thread has a simple structure, which is an excellent effect.

[Brief explanation of the drawing]

1 to 6 show a first embodiment embodying the present invention, in which FIG. 1 is a side view of a binding and spinning device for carrying out a yarn splicing method, FIG. 2 is a front view of main parts, Fig. 3 is a side sectional view, Figs. 4 and 5 are side sectional views showing the operation, Fig. 6 is a plan sectional view of the injection nozzle, and Figs. 7 and 8 show the second embodiment. 7
The figure is a side sectional view, Figure 8 is a plan view of the blowing means, and Figure 9 is a side sectional view.
10 is a plan view showing a modification of the blowing means, and FIGS. 11 and 12 are side sectional views of a conventional device. Front roller...3, Twisting nozzle...4, First nozzle...8, Second nozzle...9, Inlet section...
8a, 9a, outlet section...8c, 9c, injection nozzle as blowing means...15, thread removal opening...18,
Piecing roller...19, Yarn end suction tube as suction means...20, Space...S.

Claims (1)

[Scope of Claims] 1. Two nozzles that generate swirling flows in opposite directions to each other are arranged at a steady spinning position close to the front roller of a drafting device, and the first nozzle disposed upstream between the two nozzles discharges the exhaust gas. In the bundling and spinning device, which is arranged with a space provided for the yarn, when piecing the yarn, a suction means is applied to the inlet of the first nozzle, and a blowing means is applied to the outlet of the second nozzle, which is disposed on the downstream side. By this, the end of the thread connected to the package cage is led out from the outlet of the second nozzle to the inlet of the first nozzle, and at least until the end of the thread is led out to the inlet of the second nozzle, the suction means and a method for splicing yarn in a binding spinning device, characterized by operating a blowing means at the same time. 2. The splicing of the binding and spinning device according to claim 1, wherein the suction means and the blowing means are operated at a threading position where both nozzles are moved laterally in parallel from the steady spinning position. Method.