JP2001192949A - Weft insertion nozzle for water jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit water injected from a weft-insertion nozzle from dispersing thereby preventing the jetted water from coming into contact with the warp threads and damaging them, and simultaneously suppressing the speed reduction of the jetted water to increase the weft-insertion operation speed. SOLUTION: In one of the weft-insertion nozzle 1 for a water jet loom equipped with the needle 2 having thread-guiding eye 7 bored, the first jetting hole 11, the second jetting hole 12 that is opened in front of the first jetting hole 11 with a larger inner diameter than that of the first jetting hole 12 is arranged concentrically to the first jetting hole 11, and with the jetting flow path linking the first jetting hole 11 to the second jetting hole 12, an inclined face 16 is formed in the jetting flow path 13 concentrically to the first hole 11 and the second hole 12 from the hole having the inner diameter larger than that of the first jetting hole 11 toward the second jetting hole 12 as the inner diameter is gradually expanded toward the second jetting hole 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a weft insertion nozzle for a water jet loom.

[0002]

2. Description of the Related Art FIG. 1 shows a weft insertion nozzle 1 of a conventional water jet loom. The weft insertion nozzle 1 of the water jet loom is assembled by a needle 2, a stabilizer 3, a nozzle body 4 and a nozzle holder 5.
The needle 2 is fixed inside the cylindrical nozzle body 4 in the weft insertion direction, has a yarn guide hole 7 formed at the center position, and inside the yarn guide hole 7, the weft 6 is inserted. Lead. The stabilizer 3 is fixed inside the nozzle main body 4 in a state where the tip of the needle 2 is inserted inside the nozzle main body 4.
An injection port 11 is formed. The first injection port 11 communicates with a fluid path 8 formed in the nozzle body 4.

The nozzle body 4 has a cylindrical shape as described above, and incorporates the needle 2 and the stabilizer 3 in a concentric manner. The first injection port 11 is provided at the tip of the tip of the needle 2, that is, at the end on the weft insertion side. And a second injection port 12 having an inner diameter larger than the first injection port 11. In this way, the first injection port 11 and the second injection port 12 are formed concentrically about the axis 9 of the weft insertion nozzle, and the injection flow path 13 is formed between them. The nozzle holder 5 fixes the nozzle body 4 in the weft insertion direction, and supplies the pressure water 10 toward the fluid path 8 through the supply path 14 for the pressure water 10.

[0004]

When the weft is inserted, the pressurized water 10 is supplied to the supply passage 14,
Since the pressure water 10 is supplied to the first injection port 11 through the fluid path 8, the pressure water 10 becomes the injection water 10 a at the first injection port 11 and is injected into the injection flow path 13. Along with that, Needle 2
The weft yarn 6 is drawn out from the yarn introduction hole 7 and flies along with the jet water 10a to perform weft insertion.

[0005] By the injection of the injection water 10 a from the first injection port 11, the following airflow is generated inside the injection flow path 13. Air flows in from the second injection port 12 having an inner diameter larger than that of the first injection port 11 as shown by an arrow, advances along the cylindrical inner surface, hits the upstream end of the injection flow path 13 and bends. Heads toward the center, contacts the injection water 10a, and heads for the second injection port 12 together with the injection water 10a. At this time, the air flow wraps around the jet water 10a and flows.
a is prevented from diffusing.

The air flow entering from the second injection port 12 hits the upstream end face of the injection flow path 13 (end face of the stabilizer 3) at right angles. At that time, turbulence of the air flow occurs near the upstream end, and the air flow toward the second injection port 12 is also turbulent, so that the injection water 10a cannot be sufficiently wrapped, and the function of preventing the injection water 10a from diffusing. I can't do it. For this reason, the jet water 10a is diffused during the flight process, reduces the flight speed due to an increase in air resistance, and comes into contact with upper and lower warps forming an opening (not shown) to generate fluff and the like.
Damage the warp.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent the spray water from coming into contact with the warp yarn by preventing the spray water from diffusing from the weft insertion nozzle, and to suppress a decrease in the speed of the spray water, It is to increase the weft insertion speed.

[0008]

According to the present invention, there is provided a first injection port through which a needle is inserted, and a second injection port having an inner diameter larger than the first injection port and opening at a tip of a weft insertion nozzle. In the communicating injection flow path, an inclined surface whose inner diameter gradually increases toward the second injection port is formed concentrically.

Specifically, the present invention provides a needle having a yarn introduction hole formed therein, a first injection port through which the tip of the needle is inserted, and an inner diameter larger than the first injection port beyond the first injection port. A second injection port which opens concentrically with the first injection port;
In a weft insertion nozzle of a water injection loom having an injection flow path communicating the injection port and the second injection port, in the injection flow path,
An inclined surface whose inner diameter gradually increases from a hole having an inner diameter equal to or larger than the inner diameter of the first injection port toward the second injection port is formed concentrically with respect to the first injection port and the second injection port.

Here, the hole has an inner diameter larger than or equal to the first injection port, and is the same as the first injection port in the axial direction of the weft insertion nozzle. Is formed at the position.

The downstream end of the inclined surface has a cylindrical surface having the same inner diameter as the second injection port between the first injection port and the second injection port in the axial direction of the weft insertion nozzle. The cylindrical surface having the same inner diameter as the second nozzle and having the same inner diameter as the second nozzle has a larger inner diameter than the second nozzle and is connected to the cylindrical surface with a step, or weft insertion. It is located at the second injection port in the axial direction of the nozzle.

The inclined surface is formed by a concave curved surface drawn by rotating a concave curve around the axis of the weft insertion nozzle.

[0013] With the injection of the injection water from the first injection port, air flows into the injection flow path from the second injection port, and at least a part of the inflowing air flows toward the center along the inclined surface. Flows. At this time, since the airflow does not collide with the inclined surface at right angles, the turbulence of the air flow can be suppressed smaller than in the related art. In addition, the air heading toward the center converges the jet water, is brought into contact therewith, and heads toward the second jet port. At this time, the airflow flowing toward the second injection port flows around the injection water and prevents the injection water from diffusing.

[0014]

FIG. 2, FIG. 3 and FIG. 4 show a weft insertion nozzle 1 of a water jet loom according to the present invention. The weft insertion nozzle 1 of the water jet loom comprises a needle 2, a stabilizer 3, and a nozzle body 4 in the same manner as in the prior art.
And the nozzle holder 5. The needle 2 is fixed inside the cylindrical nozzle body 4 in the weft insertion direction, and has a yarn introduction hole 7 formed at the center position.
And guides the weft yarn 6 inside the yarn introduction hole 7.

The stabilizer 3 is fixed inside the nozzle body 4 in a state where the tip of the needle 2 is inserted inside the nozzle body 4, and is concentric with the tip of the needle 2 near the tip of the needle 2. One injection port 11 is formed. The first injection port 11 is annular and communicates with a fluid passage 8 formed in the nozzle body 4. In addition, the nozzle body 4
Is cylindrical as described above, incorporates the needle 2 and the stabilizer 3 concentrically, and concentrically with the first injection port 11 at the tip of the tip of the needle 2, that is, the end on the weft insertion side,
A circular second injection port 12 having an inner diameter larger than the first injection port 11 is formed.

In this manner, the first injection port 11 and the second injection port 12 are formed concentrically with respect to the axis 9 of the weft insertion nozzle, and are formed in a space in the cylindrical surface 18 between them. , An injection flow path 13. The nozzle holder 5 fixes the nozzle body 4 in the weft insertion direction, and supplies the pressure water 10 to the fluid path 8 through the supply path 14 of the pressure water 10.

According to the present invention, in the weft insertion nozzle 1 of the water jet loom described above, an annular airflow guide 15 is provided inside the injection flow path 13, and the inner surface of the airflow guide 15 defines the first injection port 11. An inclined surface 16 whose inner diameter gradually increases from a hole 17 having an inner diameter equal to or larger than the inner diameter toward the second injection port 12 is formed concentrically with the axis 9 of the weft insertion nozzle. Here, the inclined surface 16 is formed of a concave curved surface, a conical surface, a convex curved surface, or a curved surface of a combination thereof. The upstream end of the inclined surface 16 is the hole 17 described above, and the inclined surface 1
6 has the same diameter as the second injection port 12 and has a cylindrical surface 18 between the first injection port 11 and the second injection port 12.
Connected to The hole 17 of the inclined surface 16 is, as shown by a two-dot chain line,
The inner diameter may be the same as that of the first injection port 11 and may be formed from a conical surface and a convex curved surface. Further, the inclined surface 16 may be constituted by a plurality of discontinuous inclined surfaces in the direction of the axis 9 of the weft insertion nozzle.

The stabilizer 3 has a plurality of rectifying grooves 3a extending in the axial direction on the upstream side. The groove 3a can be formed not in the axial direction but in a spiral shape so as to converge the jet water 10a by turning.

At the time of weft insertion, the pressure water 10 is supplied to the supply passage 14,
The fluid is supplied to the first injection port 11 via the fluid passage 8, becomes the injection water 10 a at the first injection port 11, and is injected into the injection flow path 13. Along with this, the weft 6 is pulled out from the yarn introduction hole 7 of the needle 2, flies with the jet water 10 a, and the weft is inserted.

With the injection of the injection water 10 a from the first injection port 11, air flows from the second injection port 12 into the injection flow path 13 as shown by the arrow, and the inflow air flows along the inclined surface 16. Flow towards the center. At that time, the air is
Since the airflow does not collide at a right angle to 6, the turbulence of the air flow can be suppressed smaller than before. The air directed toward the center converges the jet water 10 a to the axis 9 of the weft insertion nozzle, is brought into contact with the jet water 10 a, and travels toward the second jet port 12. At this time, the airflow toward the second injection port 12 flows so as to wrap around the injection water 10a, thereby preventing the injection water 10a from diffusing.

According to experiments, 120 to 140 degrees is effective as the central angle of the inclined surface 16, and 2.5 to 3 is advantageous as the aperture ratio (second injection port / first injection port). .

In FIG. 5, the inclined surface 16 has a concave curved surface,
This is an example in which a conical surface and a convex curved surface are formed. Slope 1
6 is located at the second injection port 12. The hole 17 of the inclined surface 16 is made small as shown by a two-dot chain line,
It may be the same as the injection port 11.

In FIG. 6, the hole 17 of the inclined surface 16 is
This is an example in which it is formed downstream of the injection port 11 and upstream of the tip of the needle 2. The downstream end of the inclined surface 16 is located upstream of the second injection port 12.

FIG. 7 shows a structure in which the first hole 17a is provided through the upstream hole 17a.
An inclined surface 16a is formed, and a cylindrical surface is formed at the terminal position of the first inclined surface 16a. A hole 17b is formed at the terminal position of the cylindrical surface.
Is formed, and the second inclined surface 16b is formed from this. Thus, the inclined surface 16 (16a, 16b)
Are formed in a discontinuous state.

FIG. 8 shows an example in which the stabilizer 3 and the airflow guide 15 are integrated, and the inclined surface 16 is formed by a concave curved surface. The downstream end of the inclined surface 16 has an inner diameter larger than that of the second injection port 12 and is connected to the cylindrical surface 18 from the second injection port 12 with a step.

FIG. 9 shows an example in which the airflow guide 15 is not brought into contact with the stabilizer 3 but is located at a predetermined distance downstream. The hole 17 is located upstream of the tip of the needle 2.

5 to FIG. 9 as well as FIG.
Approximately the same functions and effects as those of the examples shown in FIGS.

As illustrated in FIG. 9, a plurality of fins 19 extending in the axial direction or spiral in the axial direction are provided on the inner peripheral surface of the airflow guide 15 to form a plurality of rectifying grooves. Can also. The air flow is regulated by the fins 19 in the axial direction, and the air flow wraps around the jet water 10a while turning in the axial direction, so that the diffusion of air can be further prevented. Of course, this fin 19 can also be attached to those shown in FIGS.

[0029]

According to the present invention, the following effects can be obtained.
With the injection of the injection water from the first injection port, air flows into the injection flow path from the second injection port, and at least a part of the inflowing air flows toward the center along the inclined surface.
At this time, since the airflow does not collide with the inclined surface at right angles, the turbulence of the air flow can be suppressed smaller than in the related art. In addition, the air heading toward the center converges the jet water, is brought into contact therewith, and heads toward the second jet port. At this time, the airflow toward the second injection port flows around the injection water, and prevents the injection water from diffusing. By preventing the spray water from diffusing, it is possible to prevent the spray water from hitting the warp and causing damage such as fluffing, and also to suppress the increase in the air resistance of the spray water and increase the flight speed of the weft. be able to. According to claim 4, the airflow from the inclined surface toward the center is the first airflow.
It contacts and converges the jet water immediately after being jetted from the jet port, thereby preventing the diffusion reliably. Further, according to the ninth aspect, the air flow from the second injection port can be gradually changed toward the center without being disturbed by flowing along the concave curved surface.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a weft insertion nozzle of a conventional water jet loom.

FIG. 2 is a sectional view of a weft insertion nozzle of the water jet loom according to the present invention.

FIG. 3 is an enlarged sectional view of a main part of a weft insertion nozzle of the water jet loom according to the present invention.

FIG. 4 is a cross-sectional view taken along line AA of FIG.

FIG. 5 is an enlarged sectional view of a main part of a weft insertion nozzle of the water jet loom according to the present invention.

FIG. 6 is an enlarged sectional view of a main part of a weft insertion nozzle of the water jet loom according to the present invention.

FIG. 7 is an enlarged sectional view of a main part of a weft insertion nozzle of the water jet loom according to the present invention.

FIG. 8 is an enlarged sectional view of a main part of a weft insertion nozzle of the water jet loom according to the present invention.

FIG. 9 is an enlarged sectional view of a main part of a weft insertion nozzle of the water jet loom according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Weft insertion nozzle of water jet loom 2 Needle 3 Stabilizer 3a Rectifying groove 4 Nozzle body 5 Nozzle holder 6 Weft 7 Yoke hole 8 Fluid path 9 Axis of weft insertion nozzle 10 Pressure water 10a Spray water 11 First injection port 12 second injection port 13 injection flow path 14 supply path 15 air flow guide 16 inclined surface 16a first inclined surface 16b second inclined surface 17 hole 17a, 17b hole 18 cylindrical surface 19 fin

Claims (9)

[Claims] 1. A needle having a yarn introduction hole formed therein, a first injection port through which the tip of the needle is inserted, and an inner diameter larger than the first injection port ahead of the first injection port and concentric with the first injection port. In a weft insertion nozzle of a water jet loom having a second injection port opening in a shape, and an injection flow path communicating the first injection port and the second injection port, the inner diameter of the first injection port is provided in the injection flow path. A weft for a water jet loom, wherein an inclined surface whose inner diameter gradually increases from the hole having the above inner diameter toward the second jet port is formed concentrically with respect to the first jet port and the second jet port. Put nozzle. 2. The weft insertion nozzle of a water jet loom according to claim 1, wherein said hole has an inner diameter larger than said first jet port. 3. The weft insertion nozzle for a water jet loom according to claim 1, wherein said hole has the same inner diameter as said first jet port. 4. The water jet loom according to claim 1, wherein the hole is formed at the same position as the first injection port in the axial direction of the weft insertion nozzle. Weft insertion nozzle. 5. The downstream end of the inclined surface is provided between a first injection port and the second injection port in the axial direction of the weft insertion nozzle and has a cylindrical surface having the same inner diameter as the second injection port. 5. The weft insertion nozzle of a water jet loom according to claim 1, wherein the weft insertion nozzle is connected. 6. The apparatus according to claim 5, wherein the downstream end of the inclined surface has the same inner diameter as the second injection port and is continuous with a cylindrical surface having the same inner diameter as the second injection port. Weft insertion nozzle for water jet loom. 7. The weft insertion of a water jet loom according to claim 5, wherein the downstream end of the inclined surface has an inner diameter larger than that of the second injection port and is connected to the cylindrical surface with a step. nozzle. 8. The water jet loom according to claim 1, wherein the downstream end of the inclined surface is located at the second jet port in the axial direction of the weft insertion nozzle. Weft insertion nozzle. 9. The method according to claim 1, wherein the inclined surface is formed by a concave curved surface drawn by rotating a concave curve about an axis of the weft insertion nozzle.
The weft insertion nozzle of the water jet loom according to 2, 3, 4, 5, 6, 7, or 8.