JPH0860492A - Auxiliary nozzle of air jet loom - Google Patents

Abstract

PURPOSE: To enhance the use efficiency of compressed air and dispose an auxiliary nozzle in parallel to warps. CONSTITUTION: The main body 2 of an auxiliary nozzle 1 is formed in a flat hollow shape in which the front wall 2a and the rear wall 2b are arranged in substantially parallel to each other. The first end (upper end) of the nozzle main body 2 is closed by a throttling processing method to be tapered. A nozzle hole 3 is formed at a place near to the first end of the front wall 2a. The nozzle hole 3 is formed so that the center of the nozzle hole is eccentric from the center of the auxiliary nozzle 1. The eccentric direction of the nozzle hole 3 is set in the direction approaching a reed, when the auxiliary nozzle 1 is attached to a sley. The nozzle hole 3 is formed so that the axis of the hole is directed to the oblique upper side. The nozzle hole 3 is processed so that the axis of the hole is upward directed with respect to the horizontal direction and tilted with respect to the longitudinal direction of the nozzle hole 3. The peripheral wall of the nozzle hole 3 is formed in a tapered shape where the angle to the axis of the hole is constant and the diameter of the hole is contracted toward the lower side in the blowing direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary nozzle for an air jet loom.

[0002]

2. Description of the Related Art Generally, in an air jet loom, a weft flying path surrounded by a U-shaped guide wall formed on a reed or a weft flying path formed by a large number of guide pieces arranged along the reed. Is placed in the warp opening when weft-inserting. Then, the weft yarn is inserted into the weft flying path together with the air flow ejected from the main nozzle. In these air jet looms, in order to extend the flight distance of the weft yarn end and weave a wide woven fabric, auxiliary nozzles are arranged on the sley at appropriate intervals along the reed, and the auxiliary nozzles The air flow is intermittently injected from the nozzle hole into the weft flying path. The air flow ejected from the auxiliary nozzle joins the air flow ejected from the main nozzle to compensate for the decrease in speed, pressure and kinetic energy, and the weft tip is moved to a position corresponding to the adjacent auxiliary nozzle on the downstream side. It becomes the main air flow to be transported.

The auxiliary nozzle has a wall thickness of less than 1 mm (0.
2 to 0.6 mm) is formed from a hollow tube member, the first end of the hollow tube member is closed, the second end is connected to a compressed air source, and air is supplied from a nozzle hole formed on the first end side. It is designed to jet. Japanese Patent Laid-Open No. 51-17368 discloses an auxiliary nozzle 50 as shown in FIGS.
As the above, there is disclosed a hollow needle 51 having a large number of small-diameter nozzle holes 52 formed at the tip thereof. Moreover, JP-A-3-9
As shown in FIG. 10 of Japanese Patent No. 7939, the auxiliary nozzle 5
As No. 3, a nozzle hole 54 having a large diameter is formed. The peripheral wall of the nozzle hole 54 is formed in a tapered shape whose diameter decreases toward the downstream side in the injection direction.

[0004]

The small diameter nozzle hole 52
A large number of auxiliary nozzles 50 have nozzle holes 52 with a diameter
Since the wall thickness of the auxiliary nozzle 50 is equal to or smaller than that of the auxiliary nozzle 50, the nozzle hole 5
The directivity of the air flow injected from 2 is good, and the auxiliary nozzle 5
Injection so as to deflect from a direction orthogonal to the outer surface of 0
You can adjust the direction. Therefore, in FIG.
As shown, the auxiliary nozzle 50 is arranged in parallel with the warp W,
To improve the warp handling and reduce the frictional resistance with the warp W.
You can However, in the case of this auxiliary nozzle 50, many
The center of the entire nozzle hole 52 of the
Therefore, the weft in the weft flight path formed by the reed
And the large distance from the center of the entire nozzle hole 52 is large.
The air flow ejected from each nozzle hole 52 reaches the weft.
The air that is used to convey the weft yarn
Is not used efficiently. Also, it is ejected from the auxiliary nozzle 50.
Air flow diameter D₁, The tip of the first end of the auxiliary nozzle 50
Length L from the center of the nozzle hole group 52₁And auxiliary nozzle
Air flow diameter D from the tip of 50₁Length S to the bottom of ₁Is
Auxiliary nozzle shown in FIG. 10 in order to obtain the required injection air flow rate.
Each diameter and length D in the le 53₂, L₂And S
₂Is larger than the length, especially the length S₁Grows larger. This
Therefore, the warp W is easily exposed to the jet air flow, and the auxiliary nose
There is also a problem that the injection period of the fuel 50 is limited to a short period.

On the other hand, when one nozzle hole 54 having a diameter reduced toward the downstream side in the injection direction is formed, the directivity of the injection air flow is good, but the directivity is in the direction orthogonal to the outer surface of the auxiliary nozzle 53. Limited to. When the nozzle holes 54 are formed at an angle that deflects with respect to the direction orthogonal to the outer surface, the directivity deteriorates. Therefore, when using the auxiliary nozzle 53, the auxiliary nozzle 53 shown in FIG.
As shown in (b), it is necessary to arrange the auxiliary nozzle 53 so as to intersect the warp yarn W, and there is a problem that the frictional resistance when the auxiliary nozzle 53 enters the warp yarn opening is large.
Further, since the center of the nozzle hole 54 is located at the center of the auxiliary nozzle 53, the air flow jetted from the nozzle hole 54, like the auxiliary nozzle 50, is largely diffused until it reaches the weft,
Inefficient use of air.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide an auxiliary nozzle of an air jet loom which can improve the use efficiency of compressed air of the auxiliary nozzle. It is in. A second object is, in addition to the first object, to provide an auxiliary nozzle for an air jet loom in which the auxiliary nozzle can be installed in parallel with the warp.

[0007]

In order to achieve the first object, the invention according to claim 1 is an auxiliary nozzle of an air jet loom for weft insertion of weft yarns into a warp shed by the action of jet air. The center of the nozzle hole formed in the vicinity of the first end of the nozzle body with the first end closed was eccentric to the reed side from the center of the auxiliary nozzle.

In order to achieve the second object, according to the invention of claim 2, in the invention of claim 1, the nozzle hole is formed such that the hole axis is directed obliquely upward. .

According to the invention described in claim 3, claim 1
Alternatively, in the invention according to claim 2, the nozzle hole is 1
Individually formed, the area of the cross section orthogonal to the hole axis becomes smaller toward the injection side.

[0010]

In the invention described in claim 1, since the center of the nozzle hole is eccentric to the reed side from the center of the auxiliary nozzle, the nozzle hole is formed at the center of the auxiliary nozzle as compared with the case where the center of the nozzle hole is formed. The distance between the center of the hole and the weft in the weft flight path becomes shorter. As a result, the diffusion of the air flow ejected from the nozzle holes until the air flow reaches the wefts in the weft flight path is reduced, and the efficiency of the air used to convey the wefts is improved. The center of the nozzle hole means the center of the nozzle hole when there is one nozzle hole, and in the case of an auxiliary nozzle having a large number of small-diameter nozzle holes, the center of the shape including all nozzle holes. The center of the nozzle hole.

Further, according to the second aspect of the invention, since the hole axis of the nozzle hole is formed to be directed obliquely upward, the air flow is deflected from a direction orthogonal to the outer surface of the auxiliary nozzle. Is jetted. As a result, the auxiliary nozzle can be arranged in a state where the warp yarn can be easily separated, that is, in parallel with the warp yarn.

According to the invention of claim 3, the invention of claim 1
Alternatively, the same operation as the invention described in claim 2 is performed. Further, since there is one nozzle hole, the diameter of the jet air flow becomes smaller than that of the auxiliary nozzle having a large number of nozzle holes, and the air flow is jetted from the auxiliary nozzle in a state where the warp yarn is not exposed to the jet air flow. It is possible to extend the period.

[0013]

【Example】

(Embodiment 1) A first embodiment embodying the present invention will be described below with reference to FIGS. The auxiliary nozzle 1 is formed of a thin stainless steel plate, and as shown in FIGS. 2A and 2B, the nozzle body 2 is formed into a flat hollow tube in which a front wall 2a and a rear wall 2b are arranged in parallel with each other. Has been done. The first end (upper end) of the nozzle body 2 is closed by drawing so as to be tapered. The nozzle body 2 is not symmetrical in the front-rear direction, and as shown in FIG. 2A, the inclined portion on the rear wall 2b side of the first end of the auxiliary nozzle 1 is formed longer than the inclined portion on the front wall 2a side.

One nozzle hole 3 is formed near the first end of the front wall 2a of the nozzle body 2. As shown in FIG. 1, the nozzle hole 3 is formed so that its center is eccentric from the center of the auxiliary nozzle 1. The eccentric direction of the nozzle hole 3 is a direction (reed side) that approaches the reed when the auxiliary nozzle 1 is attached to a sley (not shown).

The nozzle hole 3 is formed so that its hole axis 4 is directed obliquely upward. That is, the nozzle hole 3 is
As shown in FIG. 2 (a), the hole shaft 4 faces upward with respect to the horizontal direction by a processing angle E, and as shown in FIG. 2 (b), the hole shaft 4 is arranged in the front-back direction (thickness) of the nozzle body 2. Direction), and is processed so as to be inclined by a deflection processing angle F.
The peripheral wall 3a of the nozzle hole 3 has a constant angle C with the hole axis 4, and is formed in a tapered shape with a reduced diameter toward the ejection side. That is, the nozzle hole 3 is formed so that the area of the cross section orthogonal to the hole axis 4 becomes smaller toward the downstream side in the injection direction. Peripheral wall 3 in a cross section with the hole axis 4 as the central axis
The taper angle C formed by a and the hole axis 4 is preferably 10 to 50 degrees. The nozzle hole 3 is formed by electric discharge machining.

Next, the auxiliary nozzle 1 constructed as described above
The operation of will be described. The auxiliary nozzle 1 is used in a modified reed type air jet loom in which a guide recess is formed in the reed.
As shown in FIG. 3, guide recesses 5a are formed on the front side of a large number of deformed reeds 5 (only one is shown) that are erected in parallel on a sley (not shown). A weft flying path 6 along which the weft Y jetted from a nozzle (not shown) flies is constituted by a row of guide recesses 5a. The weft yarn Y put in the weft flying route 6 has a plurality of auxiliary nozzles 1 (only one is shown) along the weft flying route 6.
Is conveyed by the jetting action of. The auxiliary nozzle 1 has a nozzle hole 3 on the side of the deformed reed 5 and is arranged in parallel with a warp (not shown). Since the tip of the auxiliary nozzle 3 is tapered and the auxiliary nozzle 1 is arranged in parallel with the warp, the auxiliary nozzle 1 can smoothly enter between the warps.

A second end of the auxiliary nozzle 1 is connected to a compressed air source (neither is shown) via a connector and a pipe, and is intermittently adjusted to the weft insertion timing via a supply valve provided in the connector. A stream of air is injected into. As shown in FIG. 4, the air flow injected from the nozzle hole 3 forms a deflection angle β with respect to the longitudinal direction of the weft flying path 6, that is, the front-back direction of the auxiliary nozzle 1, and an upward angle α with respect to the vertical direction.
To proceed.

The deflection angle β does not match the deflection processing angle F because the hole diameter D is larger than the plate thickness t of the nozzle body 2.
In addition, as in the conventional device, the center of the nozzle hole 3 is placed in the auxiliary nozzle
When it is formed so as to coincide with the center of, the deflection angle β cannot be made the target size even if the deflection processing angle F is increased. On the other hand, when the center of the nozzle hole 3 is decentered from the center of the auxiliary nozzle 1 as in the present invention, the air flow is ejected from the nozzle hole 3 at a large deflection angle β that is the target.

In the auxiliary nozzle 1 of this embodiment, when the taper angle C of the nozzle hole 3 is set to, for example, about 20 °, the air flow injected from the nozzle hole 3 when the pressure of the compressed air supplied is changed. Upward angle α of the injection direction of
Was measured. FIG. 6A is a graph showing the measurement results, in which the solid line shows the result of the auxiliary nozzle 1 of this embodiment, and the broken line shows the auxiliary nozzle of the conventional example that does not decenter the position of the nozzle hole (see FIG. 10). The result of the auxiliary nozzle 53) shown is shown. In either case, the upward angle α is maintained substantially constant when the pressure of the compressed air is above a certain level, and the characteristics similar to those of the conventional example are exhibited. Further, when the taper angle C is set to a value larger than 20 ° (for example, 30 °), the upward angle α becomes almost constant from a smaller pressure state as shown by a chain line in FIG.

Further, FIG. 6B shows that the taper angle C of the nozzle hole 3 of the auxiliary nozzle 1 of this embodiment is, for example, about 20.
9 is a graph showing the measurement result of the deflection angle β of the jet direction of the air flow jetted from the nozzle hole 3 when the pressure of the compressed air supplied is changed in the case of °. The solid line in the figure shows the result of the auxiliary nozzle 1 of this embodiment, and the broken line shows the auxiliary nozzle of the conventional example (FIG.
The result of the auxiliary nozzle 53) shown in 0 is shown. In the conventional example, the deflection angle β is kept constant at approximately 0 °, and the ejection direction can hardly be deflected. On the other hand, the deflection angle β of the auxiliary nozzle 1 of this embodiment is hardly affected by the pressure of compressed air,
It is held at the desired angle (1 ° -10 °).

The reason why the air flow is jetted at a large deflection angle β by forming the nozzle hole 3 at a position eccentric from the center of the auxiliary nozzle 1 is considered as follows. When the nozzle hole 3 is eccentric, a large amount of compressed air supplied to the auxiliary nozzle 1 flows to the side opposite to the eccentric side of the nozzle hole 3 toward the eccentric side, as indicated by the broken line in FIG. It is easy to inject. In addition to this state, the peripheral wall 3a of the nozzle hole 3
Is formed in a taper shape in which the diameter is reduced toward the downstream side in the injection direction, so that the air flow is directed in a predetermined direction in which the hole axis 4 is directed together with the eccentricity of the nozzle hole 3. It is jetted well. On the other hand, when the nozzle hole 3 is not eccentric, the compressed air supplied to the auxiliary nozzle 1 flows to the left and right sides of the nozzle hole 3 with substantially equal strength as shown by the broken line in FIG. Attempt to spray almost straight from the hole 3. Even if a tapered surface is formed on the peripheral wall of the nozzle hole 3, the diameter D of the nozzle hole 3 is larger than the thickness of the nozzle body.
Is large, it is difficult to deflect the direction of the injection air flow. This is supported by the graphs of FIGS. 6 (a) and 6 (b).

Further, in this embodiment, as shown in FIG. 3, the distance L1 between the weft Y flying in the weft flying path 6 and the center of the nozzle hole 3 formed in the auxiliary nozzle 1 is the weft Y. Since it is smaller than the distance L2 from the center of the auxiliary nozzle 1, the air flow injected from the nozzle hole 3 is unlikely to diffuse while reaching a predetermined position, and the efficiency of use of the air flow used to convey the weft Y is improved. .

As described above, in this embodiment, the nozzle hole 3
Since the center of the auxiliary nozzle 1 is eccentric to the deformation reed 5 side with respect to the center of the auxiliary nozzle 1 and the hole shaft 4 is directed obliquely upward, even if the auxiliary nozzle 1 is arranged parallel to the warp, the nozzle hole 3 It is possible to effectively apply the jet air flow from the weft yarns Y flying on the weft yarn flying path 6. Further, since the nozzle hole 3 is formed in a taper shape such that the diameter is reduced toward the downstream side in the injection direction, the flow velocity of the air flow becomes faster at the same flow rate as compared with the nozzle hole having a constant diameter. It becomes possible to save consumption. Further, since the change in the injection direction with respect to the change in the pressure of the supplied compressed air is small, the weft insertion is stable. Further, as compared with the auxiliary nozzle in which a large number of small-diameter nozzle holes are formed, the completion time of entry of the nozzle holes 3 into the warp yarn openings is advanced and the departure start time of the nozzle holes 3 from the warp yarn openings is delayed. As a result, the period in which the nozzle hole 3 exists in the warp yarn opening becomes longer, and the ejection timing of the auxiliary nozzle 1 can be made longer. Further, since the hole diameter is larger than that in the case where a large number of small-diameter nozzle holes are formed, dust is not clogged.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. This embodiment is largely different from the previous embodiment in that a large number of small diameter nozzle holes are formed in the nozzle body. The nozzle body 2 is formed in a flat tubular shape as in the above embodiment, and has a large number of small-diameter nozzle holes 7a in its front wall 2a.
A nozzle hole 7 composed of is formed. The nozzle hole 7 is formed so that its center is eccentric from the center of the auxiliary nozzle 1. The center of the nozzle holes 7 means all nozzle holes 7a.
It means the center of the figure S having a shape including. The eccentric direction of the nozzle hole 7 is a direction (reed side) that approaches the reed when the auxiliary nozzle 1 is attached to a sley (not shown). Each nozzle hole 7a is not a tapered hole but has a constant diameter and is formed so that the hole axis is directed obliquely upward.

Also in this embodiment, since the center of the nozzle hole 7 approaches the weft Y flying in the weft flying path 6, the air flow jetted from the nozzle hole 7 diffuses while reaching a predetermined position. It is difficult, and the efficiency of the air flow to convey the weft yarn Y is improved. Further, since the diameter of each nozzle hole 7a is small, the nozzle hole 7a
Even if a is not formed as a tapered hole, it is possible to inject an airflow having good directivity so that the desired upward angle α and deflection angle β can be obtained.

The present invention is not limited to the above embodiments, but may be embodied as follows. (1) The shape of the nozzle hole 3 may be such that the cross-sectional area on the downstream side in the injection direction is smaller than the inner cross-sectional area of the nozzle body 2. For example, as shown in FIG. The peripheral wall 3a may have a sectional shape formed by a curve bulging toward the hole axis 4. Further, as shown in (b), the inner peripheral wall 3a of the nozzle body 2 is a cylindrical surface parallel to the hole axis 4 and the downstream side in the injection direction is a surface inclined with respect to the hole axis. As shown, the inclination with respect to the hole axis 4 may be changed in the central portion of the nozzle hole 3.
Further, as shown in (d), the outer peripheral wall 3a of the nozzle hole 3 may be a cylindrical surface parallel to the hole axis 4, and the inner peripheral wall 3a of the nozzle body 2 may be a surface inclined with respect to the hole axis. Of these shapes, the so-called bell mouth-shaped nozzle hole 3 shown in (a) is most preferable. In FIG. 8, the right side of each drawing is the inside of the nozzle body. Also, the nozzle hole 3
The sectional shape orthogonal to the hole axis 4 is not limited to a circle or an ellipse, and may be a quadrangle or a polygon.

(2) In the first embodiment, the hole axis 4 of the nozzle hole 3 may be formed without being deflected in the front-back direction of the auxiliary nozzle 1. In this case, by arranging the auxiliary nozzle 1 so as to intersect the warp, the air flow is jetted in a desired direction. Further, similarly to the first embodiment, the jet air flow can be effectively applied to the weft Y flying in the weft flying path 6.

(3) In the first embodiment, the angle between the peripheral wall 3a of the nozzle hole 3 and the hole axis 4 is not constant at all points, but the peripheral wall 3 at the portion away from the center of the auxiliary nozzle 1
The angle formed by a and the hole axis 4 may be reduced, or the peripheral wall 3a of the portion may be formed parallel to the hole axis 4.

(4) When forming the nozzle hole 7 consisting of a large number of small-diameter nozzle holes 7a, each nozzle hole 7a may be a tapered hole having a small diameter on the downstream side in the ejection direction. In this case, the directivity of the jet air flow is further improved.

(5) When forming the nozzle holes 7 composed of small-diameter nozzle holes 7a, the number and arrangement shape of the nozzle holes 7a may be appropriately changed. (6) The shape of the first end of the nozzle body 2 is not limited to the shape of the first embodiment, but the front wall 2a and the rear wall 2b are symmetrical shapes,
The nozzle hole 3 may be formed in the upper inclined portion of the front wall 2a.

Inventions other than those described in the claims that can be grasped from the respective embodiments and modifications will be described below together with their effects. (1) In the invention described in claim 1 or 2, the nozzle holes are composed of a large number of small diameter nozzle holes. In this case, the directivity of the jet direction of the air flow is improved without making the nozzle hole a tapered hole.

[0032]

As described in detail above, the first to third aspects of the invention are described.
According to the invention described in (1), it is possible to improve the use efficiency of the compressed air of the auxiliary nozzle for conveying the weft yarn. Further, according to the invention described in claim 2, the auxiliary nozzle can be installed in parallel with the warp, and the warp handling is improved. Further, according to the invention described in claim 3, in addition to exhibiting the same effect as the invention described in claim 1 or claim 2, it becomes possible to lengthen the injection timing of the auxiliary nozzle.

[Brief description of drawings]

FIG. 1 is a partial front view of an auxiliary nozzle according to a first embodiment of the present invention.

2A is a vertical sectional view of FIG. 1, and FIG. 2B is a horizontal sectional view of FIG.

FIG. 3 is a schematic diagram showing the arrangement of a modified reed and an auxiliary nozzle.

FIG. 4 is a schematic perspective view illustrating the operation of an auxiliary nozzle.

FIG. 5A is a schematic view illustrating the operation of the auxiliary nozzle of the embodiment, and FIG. 5B is a schematic view illustrating the operation of the comparative example.

6A and 6B show air characteristics of an auxiliary nozzle, FIG. 6A is a graph showing a relationship between an upward angle α and pressure, and FIG. 6B is a deflection angle β.
It is a graph which shows the relationship between pressure and pressure.

FIG. 7 is a partial front view of an auxiliary nozzle according to a second embodiment.

FIG. 8 is a cross-sectional view showing a shape of a nozzle hole of a modified example.

9A is a partial cross-sectional view of a conventional example, and FIG. 9B is a partial front view.

FIG. 10 is a partial front view of another conventional example.

FIG. 11 is an explanatory diagram showing a relationship between auxiliary nozzles and warp yarns.

[Explanation of symbols]

1 ... Auxiliary nozzle, 2 ... Nozzle body, 2a ... Front wall, 2b ...
Rear wall, 3 ... Nozzle hole, 3a ... Peripheral wall, 4 ... Hole shaft, 7, 7a
… Nozzle hole, α… Upward angle, β… Deflection angle, C… Angle, Y
... weft, W ... warp.

Claims (3)

[Claims] 1. A center of a nozzle hole formed in the vicinity of a first end of a nozzle body having a closed first end in an auxiliary nozzle of an air jet loom for weft insertion into the warp opening by the action of jet air. Is an auxiliary nozzle for an air-jet loom that is eccentric to the reed side from the center of the auxiliary nozzle. 2. The auxiliary nozzle for an air jet loom according to claim 1, wherein the nozzle hole is formed so that the hole axis is directed obliquely upward. 3. The air jet type according to claim 1, wherein one nozzle hole is formed, and the area of the cross section orthogonal to the hole axis is smaller toward the downstream side in the injection direction. Auxiliary nozzle of the loom.