JP2618013B2 - Threading nozzle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a threading nozzle for passing a thread through a through hole of an object to be inserted by using compressed air.

(Prior Art) Generally, a threading device for passing a thread through an object to be inserted is used in various fields for handling a thread or a similar linear object.
As a typical example, there is an automatic warp drawing device using compressed air found in a loom factory. Such a warp threading device is provided with a threading nozzle composed of a compression nozzle divided into a plurality of blocks, and the yarn is caused to fly by a flow of compressed air, and positioned between the compression nozzles. The thread is automatically inserted into the inserted dropper and heald, that is, the through hole of the object to be inserted.

As such a threading nozzle, the applicant of the present invention has
No. 62-153002, the threading nozzle of which is shown in FIGS. 3 and 4. In FIGS. 3 and 4, the symbol 1 is arranged on the axis xx in the threading direction. The first compression nozzle 1 has an axis x
A guide passage 2 is bored along -x. Guideway 2
Are the upper surface 3 and the lower surface 4 facing each other and a pair of side surfaces 5
And 6 smoothly decrease in the threading direction, that is, from the inlet 7 on the left side to the outlet 8 on the right side in the figure, and a main nozzle 9 is formed below the first compression nozzle 1. Although the lower end of the main nozzle 9 is not shown,
The other upper end is connected to a compressed air source and is open to the guide passage 2 through an elongated notch 10 formed in the first compression nozzle 1 along the lower surface 4 of the guide passage 2. The bottom surface 11 of the notch 10 rises from the other end of the main nozzle 9 at a gentle slope and intersects the lower surface 4. When compressed air is introduced into the main nozzle 9 from the above-described compressed air source, the main nozzle 9 9
Through the guide passage 2. Then, the supplied compressed air forms a flow in the threading direction along the guide passage 2, sucks the yarn 12 from the inlet 7 of the guide passage 2, and simultaneously puts the yarn 12 on the formed flow. It is made to fly in the through direction, and is inserted from the leading terminal 12a into the through hole 13a of the first dropper 13 positioned on the exit 8 side of the guide passage 2. Reference numeral 14 denotes a lower part of the first compression nozzle 1 and a main nozzle 9.
Is a sub-nozzle formed on the downstream side of the main nozzle 9 and is connected to a compressed air source (not shown) similarly to the main nozzle 9 to form a flow of compressed air toward the center of the hole 13a. It assists insertion into the through-hole 13a.

On the other hand, reference numerals 15 and 16 denote a second compression nozzle and a third compression nozzle having the same configuration and function as the first compression nozzle 1, respectively. The second compression nozzle 15 and the third compression nozzle 16 are the first compression nozzle 1 respectively. Similarly, the second dropper 17 is disposed downstream of the first dropper 13 on the axis xx. The second compression nozzle 15 is connected to the first compression nozzle 1
Thread 1 inserted into the through hole 13a of the first dropper 13
2 is inserted into the through hole 17a of the second dropper 17, and the third compression nozzle 16 is not shown in the drawing.
Insert the thread 12 into the through hole of the dropper. Since the second compression nozzle 15 and the third compression nozzle 16 have the same configuration as the first compression nozzle 1 as described above, the same members as those of the first compression nozzle 1 necessary for the following description will be the same. And a suffix s for the second compression nozzle 15 and a third
The compression nozzle 16 will be described with a subscript t.

(Problems to be Solved by the Invention) However, in such a conventional threading nozzle, the compressed air supplied to the first compression nozzle 1 and formed in the threading direction is threaded through the thread 12. At the same time, it collides with the wall surface of the guide passage 2s of the second compression nozzle 15, that is, the upper surface 3s and the left and right side surfaces 5s and 6s, and generates a reverse flow and a turbulent flow at the inlet 7s side as shown in part A in FIG. However, there was a problem that a threading error was caused. That is, the reverse flow and the turbulent flow of the compressed air shown in the part A disturb the flow of the compressed air formed in the guide passage 2 of the first compression nozzle 1 in the threading direction, and the flying direction of the terminal 12a of the yarn 12 Not only instability, but also, as shown by the phantom line in FIG. 3, the end of the yarn 12 acts to bend to the upstream side of the first dropper 13 so that the insertion of the through hole 13a fails. there were. A similar situation occurs for the guide passage 2t of the third compression nozzle 16, and in this case, the turbulence of the compressed air generated in the first compression nozzle 1 and the second compression nozzle 15 for the third compression nozzle 16 on the downstream side. The accumulated backflow and turbulence further increase, the threading error increases, and the probability of the threading error increases. Also, it goes without saying that the more the number of compression nozzles is increased, the more this tendency becomes more remarkable.

The backflow and turbulence generated in such a guide passage are reduced,
As measures to prevent the threading error, it is conceivable to reduce the amount of compressed air supplied to each compression nozzle or to increase the area of the inlet and outlet of the guide passage. However, in the former, the flying force for flying the yarn is reduced with respect to the tension applied to the yarn by the yarn supply mechanism or the like, and in the latter, the size of the through hole of the inserted object is reduced. The exit dimensions of the guide passage are restricted and the area of the entrance and exit cannot be increased, and neither is a feasible measure.

(Objects of the Invention) Accordingly, the present invention provides a guide nozzle of a compression nozzle which has an appropriate size for threading, and which is formed in the guide passage while appropriately maintaining the tension and flying force applied to the yarn. It is an object of the present invention to provide a threading nozzle that reduces backflow and turbulence of compressed air and eliminates threading errors.

(Means for Solving the Problems) In order to achieve the above object, a threading nozzle according to the present invention has a block provided with an inserted object having a threaded through hole formed therein and having a guide passage formed therein. At the same time, the compressed air introduced into the guide passage of the block from outside is caused to fly the yarn by being carried on the flow generated along the inner wall surface of the guide passage, and the plurality of yarns are inserted into the through hole of the object to be inserted. In a threading nozzle provided with a compression nozzle, a large number of communication holes with a small diameter communicating outward from the inner wall surface of the guide passage to the block of the compression nozzle are provided so as to reduce turbulence generated in the flow of compressed air. I have.

(Operation) In the present invention, since a large number of small-diameter communication holes communicating from the inner wall surface of the guide passage to the outside are provided in the block of the compression nozzle, turbulence generated in the compressed air in the guide passage, that is, backflow, turbulence The flow is reduced to almost nothing. Therefore, the yarn rides on the flow of the compressed air having a high flow rate formed in the threading direction in the guide passage of the compression nozzle on the upstream side, and is inserted into the through hole of the object to be inserted with the end of the yarn at the head. Is done. Further, the inserted yarn is smoothly transferred to the guide passage of the compression nozzle on the downstream side, and the yarn is sequentially inserted into the through hole of the object to be inserted. Therefore, the success probability of threading is significantly improved with a simple structure.

Hereinafter, the present invention will be described with reference to the drawings.

1 and 2 are views showing an embodiment according to the present invention.

 First, the configuration will be described.

In FIG. 1, reference numerals 21 and 22 denote a first dropper and a second dropper as through objects in the present invention in which through holes 21a and 22a are respectively formed. A plurality of, in the present embodiment, 3
The first compression nozzle 23, the second compression nozzle 24, and the third compression nozzle 25 are provided. The first compression nozzle 23 is
As shown in FIGS. 2A and 2B, the first block 26 includes an upper first block 26 and a lower second block 27. The first block 26 has a guide passage 28 formed on an axis XX. The guide passage 28 is defined by an upper inner wall surface 29 formed in the first block 26, a pair of left and right side inner wall surfaces 30 and 31, and a lower inner wall surface 32 which is the upper surface of the second block 27. Inner wall 29, lower inner wall 32 and side inner wall
30 and 31 are close to each other along the threading direction Y,
The cross-sectional area of 28 decreases from the passage entrance 33 toward the passage exit 34. The upper inner wall surface 29, the side inner wall surfaces 30, 31 and the lower inner wall surface 32 each constitute an inner wall surface 35 of the guide passage 28. The first block 26 constitutes a block of the plurality of compression nozzles in the present invention.

In FIGS. 1 and 2, reference numeral 36 denotes a second block.
27, a lower end of the main compressed air supply hole 36 is opened to the outside of the first compression nozzle 23, and an upper end is bent in a threading direction indicated by an arrow Y. The compressed air injection port 37 is opened into the guide passage 28 through the notch 38. The bottom surface 39 of the notch 38 rises at a gentle inclination from the compressed air injection port 37 and intersects the lower inner wall surface 32.Although not shown, the compressed air source is connected to the main compressed air supply hole 36. When compressed air is supplied to the main compressed air supply hole 36 from a compressed air source,
The compressed air is injected into the guide passage 28 from the compressed air injection port 37 through the notch 38 and is introduced. Then, the introduced compressed air forms a flow in the threading direction Y along the inner wall surface 35 of the guide passage 28. Further, since the cross-sectional area of the guide passage 28 is reduced in the threading direction Y, the flow velocity of the flow formed by the compressed air is large, and therefore, the yarn 40 supplied by the supply device (not shown) Then, the air is sucked into the guide passage 28, flies along the flow of the compressed air, and is inserted into the through hole 21a of the first dropper 21. That is, the first compression nozzle 23
The compressed air introduced from the outside into the guide passage 28 formed in the first block 26 through the main compressed air supply hole 36 is caused to flow on the flow generated along the inner wall surface 35 of the guide passage 28 to fly the yarn 40. Has a function of inserting the thread 40 from the terminal 40a into the through hole 21a of the first dropper 21. Reference numeral 41 denotes a sub-compressed air supply hole formed in the second block 27 downstream of the main compressed air supply hole 36.
The lower end is connected to the aforementioned compressed air source for supplying compressed air to the main compressed air supply hole 36, the upper end is bent, and the compressed air injection port 42 of the terminal faces the through hole 21a of the first dropper 21. Open. When the compressed air is introduced from the compressed air source into the sub-compressed air supply hole 41, the sub-compressed air supply hole 41 is directed toward the center of the compressed air flow hole 21a along the threading direction Y. It is formed to assist the flight of the yarn 40 and the insertion into the through-hole 21a.

On the other hand, the first block 26 of the first compression nozzle 23 has a large number of small diameters communicating from the inner wall surface 35 of the guide passage 28, that is, the upper inner wall surface 29 and the side inner wall surfaces 30, 31 to the outside of the first compression nozzle 23. Communication hole 43 is provided. In the present embodiment, the first block 26 is formed of a porous material such as ceramics, for example, and the terminal 40a of the yarn 40 flying in the guide passage 28 with the communication hole 43 having a very small diameter is connected to the communication hole 43. The opening ratio of the inner wall surface 35 is further increased so as not to be caught by the opening on the inner wall surface 35 side. The configuration of the second compression nozzle 24 and the third compression nozzle 25 is the same as that of the first compression nozzle 25 described above.
The components of the second compression nozzle 24 and the third compression nozzle 25, which are the same as the configuration of the compression nozzle 23, are given the same reference numerals as those of the first compression nozzle 23, and
The compression nozzle 24 and the third compression nozzle 25 will be described with subscripts s and t, respectively. Further, in this embodiment, the case where the number of objects to be inserted is two and the number of compression nozzles provided in the threading nozzle 44 is three has been described, but the present invention is not limited to this, and a single Naturally, the present invention is applicable to the case of an object and two compression nozzles, or the case of three or more inserted objects and four or more compression nozzles.

 Next, the operation will be described.

1 and 2, when compressed air is supplied from a compressed air source (not shown) to the main compressed air supply hole 36 and the sub-compressed air supply hole 41 of the first compression nozzle 23, the compressed air is supplied to the main compressed air supply hole 36. The supplied compressed air is injected into the guide passage 28 from the compressed air injection port 37 through the notch 38 and is introduced. The compressed air introduced into the guide passage 28 forms a flow in the threading direction Y along the inner wall surface 35 of the guide passage 28, and the yarn 40 supplied to the passage entrance 33 of the guide passage 28 is sucked into the guide passage 28. Then, the yarn 40 is further carried on the above-mentioned flow of compressed air from the terminal 40a toward the through hole 21a of the first dropper 21. At the same time, the compressed air supplied to the sub-compressed air supply hole 41 and injected from the compressed air injection port 42 is formed toward the center of the flow hole 21a in the threading direction Y, and the yarn 40
To assist the flight of The compressed air injected from the main compressed air supply hole 36 and the sub-compressed air supply hole 41 is introduced into the guide passage 28s from the passage inlet 33s of the second compression nozzle 24 and collides with the inner wall surface 35s of the second compression nozzle 24. As a result, a backflow and a turbulent flow are generated, and an attempt is made to generate a turbulence in the flow of the compressed air that makes the yarn 40 fly smoothly. At this time, the first block 26s of the second compression nozzle 24 has an inner wall surface 35s of the guide passage 28s.
Since a large number of communication holes 43s having a small diameter communicating with the outside of the second compression nozzle 24 are formed, the compressed air colliding with the inner wall surface 35s is radiated outward through the communication holes 43s. In addition, since the first block 26s is formed of a porous material and the porosity of the inner wall surface 35s is high, the backflow and turbulent flow of the compressed air that tends to occur on the inner wall surface 35 are significantly reduced. For this reason, the backflow and turbulence generated in the flow of the compressed air that causes the yarn 40 to fly toward the through hole 21a of the first dropper 21 are significantly reduced, and the yarn 40 rides on the flow with almost no turbulence. Thread
From 40a, it is inserted into the through hole 21a of the first dropper 21, and is more smoothly guided to the guide passage 28s of the second compression nozzle 24. Then, in the same procedure, the second compression nozzle 24
The third compression nozzle 25 is inserted through the through hole 22a of the dropper 22,
Passed to. In this case, if the wall thicknesses of the guide passages 28s and 28t are reduced, the compressed air that has collided can be easily diffused outward, and the occurrence of backflow and turbulence can be further reduced.

As described above, in the present embodiment, a large number of small-diameter communication holes 43 communicating outward from the inner wall surface 35 of the guide passage 28 are formed in the first passage.
It is provided in block 26. For this reason, while keeping the dimensions of the guide passage 28 at an appropriate size corresponding to the through hole of the dropper,
In addition, while maintaining the tension given to the yarn 40 by the supply device and the flight force of the threading given by the flow of the compressed air properly, the turbulence generated in the flow of the compressed air in the guide passage 28, that is, the reverse flow, the turbulence The flow can be almost eliminated.
Therefore, the success probability of threading can be significantly improved with a simple structure, and a threading error can be eliminated. Further, in the present embodiment, the case where the number of objects to be inserted is two and the number of compression nozzles is three has been described, but in the case of a single object to be inserted and two compression nozzles, In the case where the number of inserted objects is three or more and the number of compression nozzles is four or more, that is, in the case where threading is performed by arranging a large number of compression nozzles on the same straight line, turbulence is reliably reduced for each compression nozzle, and turbulence is reduced. Is kept from reaching downstream, the more the number of compression nozzles increases, the more the result can be exhibited.

(Effects of the Invention) As described above, according to the present invention, since a large number of small-diameter communication holes communicating from the inner wall surface of the guide passage to the outside are provided in the block of the compression nozzle, the guide passage can be appropriately adjusted. While maintaining the dimensions and at the same time properly maintaining the tension and the flying force of the yarn, the turbulence generated in the flow of the compressed air in the guide passage, that is, the backflow and the turbulent flow can be reduced.
Therefore, it is possible to provide a threading nozzle that has a simple structure and significantly improves the probability of successful threading, and is free from a threading error, which is an object of the present invention. Further, the threading nozzle provided by the present invention is particularly effective for threading by arranging a large number of compression nozzles on the same straight line. Since the number of compression nozzles can be reliably reduced, the effect can be exerted as the number of compression nozzles increases.

[Brief description of the drawings]

1 and 2 are views showing an embodiment of a threading nozzle according to the present invention. FIG. 1 is a front cross-sectional view showing the entire structure thereof, and FIG. 2 is II-II of FIG. It is an arrow view. Third
FIG. 4 and FIG. 4 show the threading nozzle of the prior application.
FIG. 3 is a front sectional view showing the entire structure, and FIG.
FIG. 21: first dropper (object to be inserted), 22: second dropper (object to be inserted), 21a, 22a: through hole, 23: first compression nozzle (a plurality of compression nozzles), 24 ... 2 compression nozzles (plurality of compression nozzles), 25… third compression nozzle (plurality of compression nozzles), 26… first block (block), 28… guide passage, 35… inner wall surface, 40… thread Article 43, communicating hole 44, threading nozzle

Claims (2)

(57) [Claims] 1. A block having a guide passage formed therein and having a guide passage formed therein, the compressed air being introduced from outside into the guide passage of the block. In a threading nozzle provided with a plurality of compression nozzles that fly the yarn on a flow generated along the inner wall surface of the object and insert the yarn into a through hole of an object to be inserted, the yarn is guided to a block of the compression nozzle. A threading nozzle characterized in that a large number of communication holes having a small diameter communicating from the inner wall surface of the passage to the outside are provided to reduce turbulence generated in the flow of compressed air. 2. The threading nozzle according to claim 1, wherein the block of the compression nozzle is made of a porous material.