JP7364356B2 - Sub-nozzle for air-jet looms - Google Patents

Description

The present invention relates to a sub-nozzle for an air-injection type loom, which is a hollow tubular sub-nozzle having an arcuate tip and a closed end, the sub-nozzle having an injection hole formed in the tip.

Generally, a sub-nozzle for an air-injection type loom is formed in the shape of a hollow tube with a closed end as described above, and has an injection hole at the end. In addition, a plurality of sub-nozzles are arranged in the weft insertion direction on the reed holder that supports the reed, and as the reed swings during weaving, the sub-nozzles enter the warp opening to separate the warp threads. It is supposed to be done. Therefore, the sub-nozzle is formed to have a small diameter in order to improve the handling of the warp threads when entering the warp opening. Additionally, along with this, the wall thickness of the sub-nozzle is very thin, generally 0.5 mm or less.

In addition, in such a sub-nozzle, since the injection hole is bored in a thin wall, its length in the center line direction is short, and the ratio of the length in the center line direction to the diameter is very small. It has become a thing. Therefore, in such a sub-nozzle, the degree of diffusion of the airflow injected from the injection hole is high, and the directivity of the airflow toward the weft guide groove is low. There is a problem in that the weft conveyance force is small relative to the weft (referred to as "supply pressure").

Therefore, as a technique for solving such a problem, there is a technique disclosed in Patent Document 1 (hereinafter referred to as "prior art"). More specifically, in the prior art, in order to solve the above-mentioned problem, the sub-nozzle is provided with a cylindrical member for guiding compressed air toward the injection hole of the sub-nozzle in a direction toward the inside of the weft guide groove.

Utility Model Publication No. 61-159386

However, since the sub-nozzle has a small diameter as described above, the injection hole naturally has an even smaller diameter. Therefore, the cylindrical member attached to such an injection hole becomes an extremely small member. Therefore, manufacturing such a cylindrical member and attaching the cylindrical member to the injection hole are not easy, and as a result, manufacturing the sub-nozzle requires a lot of effort and manufacturing cost.

Furthermore, in the prior art, the cylindrical member is provided to protrude into the sub-nozzle. Therefore, the compressed air supplied to the sub-nozzle and flowing inside the sub-nozzle collides with the cylindrical member. This may cause turbulence in the flow of compressed air inside the sub-nozzle, which may adversely affect the jetting of compressed air from the sub-nozzle and cause a reduction in conveying force.

Therefore, the present invention provides an air-injection type loom that can increase the weft conveying force against the supply pressure by increasing the directivity of the air flow without providing a member for guiding compressed air such as a cylindrical member. The purpose is to provide sub-nozzles for

The present invention is based on a sub-nozzle for an air-injection type loom, which is a hollow tubular sub-nozzle whose tip is arcuate and closed, and has an injection hole formed at the tip. In addition, in order to achieve the above object, the present invention provides a sub-nozzle for an air-injection type loom based on which the present invention is based on a position on the outer periphery of the sub-nozzle when viewed in the direction of the center line of the injection hole. The position closest to the center of the injection hole is defined as X, and the position where the line connecting the center of the injection hole and the position X intersects with the periphery of the injection hole is defined as Y, and the injection hole is , when viewed in the direction of the center line, a line passing through the center of the injection hole and the position It is characterized in that it is formed at a position closer to the deformed reed , and the distance between the position X and the position Y is 0.75 mm or less when viewed in the direction of the center line .

In addition, the "injection hole" referred to in the present invention is not limited to one formed by a single hole, but also includes a plurality of holes formed in the area where the injection hole is to be formed, and a collection of the plurality of holes. including In that case, the position where the injection hole is formed is the area where the plurality of holes are formed, and the center position of the area is the center position of the injection hole.

Furthermore, in the sub-nozzle for an air-injection type loom of the present invention, the injection hole may be formed such that the center line does not intersect with the axis.

Further, in the sub-nozzle for an air-injection type loom of the present invention, the injection hole has a tapered portion whose inner peripheral surface is formed so that the hole diameter gradually increases toward the inner surface of the sub-nozzle. It may be formed as follows.

According to the sub-nozzle for an air-injection type loom of the present invention, by forming the injection hole at a position where the distance is 0.75 mm or less, a member for guiding compressed air such as a cylindrical member in the prior art can be replaced. It is possible to improve the weft conveying force against the supply pressure of compressed air without providing it in the injection hole. The details are as follows.

Sub-nozzles commonly used in air-injection looms include those in which the front surface where the injection holes are formed are flat toward the tip, or those that do not have such a flat part. The portion corresponding to the planar portion is formed into an arcuate surface, and the cross-sectional shape in the direction perpendicular to the axial direction is formed into an ellipse (oval shape) or a circle. In addition, in such a sub-nozzle, the injection hole is formed by being drilled in the peripheral wall of the sub-nozzle. For example, if the injection hole is formed so that the center line faces in a specific direction, the center of the injection hole may be When placed in front and viewed in the direction of the center line (center line direction), the direction of the thickness of the peripheral wall (including the wall forming the tip) (hereinafter simply referred to as the "thickness direction") is the direction of the center line. The angle formed with respect to the sub-nozzle becomes larger closer to the outer peripheral edge (edge forming the outline) of the sub-nozzle.

Therefore, when comparing an injection hole formed at a certain position with an injection hole formed closer to the outer periphery of the sub-nozzle without changing the center line direction, the periphery of the latter injection hole near the outer periphery of the sub-nozzle The angle that the thickness direction of the part where the part is located makes with the center line direction is larger than the angle of the former injection hole. That is, in the case of the latter injection hole, the peripheral edge portion is formed at a larger angle with respect to the thickness direction than in the former injection hole. The larger the angle formed by the drilling direction of the peripheral edge with respect to the thickness direction, the longer the inner peripheral surface of the injection hole becomes in the center line direction at the peripheral edge.

Therefore, when viewed in the direction of the center line, the position on the outer periphery of the sub-nozzle that is closest to the center of the injection hole is defined as X, and the line connecting the center of the injection hole and that position By forming the injection hole so that the distance between the position becomes longer in the center line direction.

Note that the longer the inner circumferential surface of the injection hole that guides the injected airflow in the center line direction, the higher the directivity of the airflow after injection. Further, by increasing the directivity of the air flow, the weft conveying force for a predetermined supply pressure of compressed air is improved. Furthermore, improving the weft conveyance force for a given supply pressure of compressed air means that the compressed air supply pressure required to obtain the prescribed weft conveyance force can be kept low. becomes. By lowering the pressure of the compressed air supplied to the sub-nozzle during weft insertion, it is possible to reduce the amount of air consumed during weaving, and it is possible to save energy.

In addition, as a result of intensive research by the inventors of the present invention, by forming the injection hole at a position where the distance is 0.75 mm or less, the sub-nozzle can achieve the desired reduction in air consumption. It has been discovered that it is possible to obtain a conveying force that can achieve the desired conveyance force. Therefore, the present invention is characterized in that, in a sub-nozzle for an air-injection type loom, the injection holes are formed such that the distance is 0.75 mm or less, thereby achieving the desired amount of air consumption. It is possible to obtain a weft conveying force that can be reduced.

Further, according to the present invention, in order to improve the directivity of the air flow so as to obtain such a conveying force, a cylindrical member for guiding the compressed air as in the above-mentioned prior art is provided in the injection hole. Since this is achieved without any problems, the manufacturing cost of the sub-nozzle can be significantly reduced compared to the conventional technology, and the above-mentioned conveying force can be stably obtained.

Further, in the sub-nozzle for an air-injection type loom according to the present invention, by forming the injection hole so that its center line does not intersect with the axis of the sub-nozzle, even if the injection holes are formed at the same position, the center Compared to the case where the injection hole is formed so that the line intersects with the axis of the sub-nozzle, the peripheral edge is formed at a larger angle with respect to the thickness direction, and the direction of the center line of the inner peripheral surface becomes longer. Therefore, the above-mentioned effect of improving the weft conveying force can be achieved to a higher degree, and air consumption can be reduced more effectively.

Furthermore, by forming the injection hole to have a tapered portion as described above, as the airflow passes through the tapered portion whose diameter is gradually reduced toward the periphery of the injection hole, the airflow is The flow rate is increased. As a result, the flow velocity at the position of the weft yarn flying in the weft guide groove is also increased, so the weft conveying force for the same supply pressure is air consumption and reduce air consumption.

FIG. 1 is a front view of an air injection loom to which the present invention is applied. FIG. 2 is a view taken along arrow A in FIG. 1. FIG. FIG. 3 is a front view of a sub-nozzle for an air-jet loom according to the present invention. FIG. 4 is a side view of FIG. 3; FIG. 3 is an enlarged view of the tip of a sub-nozzle. 6 is a sectional view taken along line DD in FIG. 5. FIG. 6 is a sectional view taken along line GG in FIG. 5. FIG. 6 is a sectional view taken along line JJ in FIG. 5. FIG. 6 is a sectional view taken along line HH in FIG. 5. FIG. It is a graph which shows the relationship between the wind speed ratio of the compressed air injected from a sub-nozzle, and the distance C about the sub-nozzle for air-injection type looms of this invention. It is a figure which shows the other example of the sub nozzle for air injection type looms by this invention.

As shown in FIGS. 1 and 2, the air injection loom to which the sub-nozzle of the present invention is applied includes a main nozzle 1 for inserting the weft, and a weft weft ejected from the main nozzle 1 to assist the flight of the weft. It is equipped with a plurality of sub-nozzles 2 arranged along the flight path. The air-jet loom also includes a reed 3 that beats inserted weft yarns against the front of the woven fabric.

The reed 3 is a so-called deformed reed, and is composed of a plurality of deformed reed blades 4 having recesses arranged in a row. The modified reed 3 has a well-known configuration, so a detailed explanation will be omitted, but each reed wing 4 has a recessed portion formed approximately at the center in the longitudinal direction. In addition, the modified reed 3 is constructed by arranging a large number of each reed feather 4 in a row and integrating them with upper and lower lead channels 5 and 6. The modified reed 3 has a weft guide groove 7 formed by a concave portion of each reed 4 due to the large number of reed fins 4 arranged in a row.

On the loom, the modified reed 3 is attached to the reed holder 8 in the lower reed channel 6, and the longitudinal direction of the reed channels 5 and 6 (width direction of the modified reed 3) is in the width direction of the loom (woven width). direction). Further, in the air injection type loom, the main nozzle 1 is also attached to the reed holder 8, and the main nozzle 1 is arranged on the reed holder 8 on the yarn feeding side of the modified reed 3.

Further, each sub-nozzle 2 is attached to a nozzle holder 9, and the nozzle holder 9 is attached to the reed holder 8, so that each sub-nozzle 2 is fixedly arranged with respect to the reed holder 8 in front of the modified reed 3. I'm doing it. Note that the plurality of sub nozzles 2 provided on the loom (on the reed holder 8) are arranged at equal intervals in the weaving width direction (the width direction of the deformed reed 3). Moreover, each sub-nozzle 2 is arranged so that its injection hole 10 faces the weft guide groove 7.

Next, one embodiment of the sub-nozzle in the air injection loom of the present invention will be described based on FIGS. 3 to 10.

As shown in FIGS. 3 and 4, the sub nozzle 2 is a hollow rod as a whole, and has a closed end and an open base end. In the illustrated example, the proximal end portion 11, which is the proximal side portion of the sub-nozzle 2, is a flat section that is perpendicular to the central axis (hereinafter simply referred to as "axis") 14 of the sub-nozzle 2. The cross-sectional shape (plane cross-sectional shape) is circular. On the other hand, the main body part 12, which is a part on the distal side of the proximal end part 11 and includes the closed end as described above, is formed so that the planar cross-sectional shape is an ellipse. Further, the main body portion 12 has a cross-sectional shape when the main body portion 12 is divided by the long axis 42 of the ellipse that is the planar cross-sectional shape, and the main body portion 12 is divided by the short axis 43 of the ellipse. In its cross-sectional shape, its tip is formed in an arcuate shape.

Further, the main body portion 12 is composed of a distal end portion 13 in the present invention, which is a portion where the injection hole 10 can be formed, and an intermediate portion 40, which is a portion between the distal end portion 13 and the base end portion 11. . Note that when the main body part 12 is divided by the long axis 42 of the ellipse having the planar cross-sectional shape, one side is the front wall part 18 and the other is the rear wall part 17, the injection holes 10 are , is formed on the front wall portion 18 at the distal end portion 13 thereof.

Regarding the injection hole 10, in this embodiment, the injection hole 10 is formed by a single hole as shown in FIG. However, in FIG. 5, the front wall portion 18 of the tip portion 13 is viewed in the direction of the center line 26 of the injection hole 10 (hereinafter also referred to as the “center line direction”) (hereinafter referred to as “front view”). ). Incidentally, the diameter of the portion of the injection hole 10 that opens to the outer surface 16 of the sub-nozzle 2 (the outer opening 31) is approximately 1.6 mm in this embodiment. Further, the injection hole 10 is formed such that the center 33 thereof is located off the axis 14. More specifically, the injection hole 10 is formed at a position such that when the sub-nozzle 2 is installed on the loom (on the reed holder 8), its center 33 is closer to the deformed reed 3 than the axis 14. .

Furthermore, the injection hole 10 is formed such that the distance C between the illustrated position X and the position Y is 0.75 mm or less. The details of the injection hole 10 are as follows.

First, as shown in FIG. 5, the position X is the position of the point closest to the center 33 of the injection hole 10 among the positions on the outer peripheral edge of the sub-nozzle 2. Incidentally, the position X is, for example, the position where the circle with the smallest radius among the circles drawn so as to be in contact with the outer circumferential edge of the sub-nozzle 2 with the center 33 of the injection hole 10 as the center touches the outer circumferential edge in the front view. , position X can also be determined in this way. In this embodiment, the position X is located on the outer peripheral edge of the tip of the main body 12 formed as described above. The injection hole 10 is formed so that the center 33 is located off the axis 14 as described above, but in this embodiment, the center 33 and the position are located off the axis 14 in the front view. It is formed at a position such that a line passing through X (imaginary line 32 in the figure) forms an angle of about 70° with a line (imaginary line 41 in the figure) perpendicular to the axis 14.

However, in this embodiment, the injection hole 10 is formed such that its center line 26 is inclined from the inner surface 15 side of the sub nozzle 2 toward the outer surface 16 side toward the tip side of the sub nozzle 2. More specifically, FIG. 6 is a cross-sectional view (DD cross-sectional view in FIG. 5) of the sub-nozzle 2 taken along a plane passing through the center 33 of the injection hole 10 and the above-mentioned position X. The injection hole 10 is formed in its cross section so that the center line 26 forms an angle of about 10° with respect to the direction orthogonal to the axis 14. Therefore, the position As shown in FIG. 2, it is located on the outer peripheral edge of the rear wall portion 17.

Moreover, the position Y is the position of the point on the periphery of the injection hole 10 where the virtual line 32 intersects with the periphery in the front view. Note that, as described above, FIG. 6 is a cross-sectional view of the sub-nozzle 2 taken along a plane passing through the center 33 of the injection hole 10 and the position X, so in FIG. This is the position of the edge on the tip side of the edges of the outer opening 31 of No. 2.

Then, as shown in FIG. 6, the distance C between the position This is the distance from a line (imaginary line 45 shown) parallel to the center line 26 passing through Y. In addition, the injection holes 10 are formed so that the distance C is 0.75 mm or less as described above, and in this embodiment, the injection holes 10 are formed at a position where the distance C is 0.5 mm. There is.

In this embodiment, the injection hole 10 is formed so that its center line 26 does not intersect with the axis 14. More specifically, FIG. 7 is a plan sectional view (GG sectional view in FIG. 5) at the center 33 of the injection hole 10; The center line 26 (more precisely, an extension of the center line 26) is formed so as not to intersect with the axis 14. That is, the injection hole 10 is formed in the sub-nozzle 2 so that the direction of the injection hole 10 is offset from the axis of the sub-nozzle 2.

Further, in this embodiment, the injection hole 10 is formed so that its inner circumferential surface 34 has a tapered portion that is formed so that the hole diameter gradually increases toward the inner surface 15 of the sub-nozzle 2. There is. Specifically, as shown in FIG. 6, the injection hole 10 has a straight portion 27 which is a portion of the sub-nozzle 2 on the outer surface 16 side and whose inner circumferential surface 34 is formed parallel to its center line 26. and a tapered portion 28 which is a portion closer to the inner surface 15 of the sub-nozzle 2 than the straight portion 27 and is formed so that the inner circumferential surface 34 thereof gradually expands in diameter toward the inner surface 15. It is formed to consist of. Therefore, in the injection hole 10, the hole diameter of the outer opening 31 and the hole diameter of the portion opening to the inner surface 15 (inner opening 30) are different, and the hole diameter of the inner opening 30 is larger. .

As explained above, in the sub-nozzle 2 of this embodiment, the injection hole 10 is formed such that the distance C from the position X to the position Y is 0.5 mm. According to the sub-nozzle 2 in which the injection hole 10 is formed in this way, the inner circumferential surface 34 of the injection hole 10 is long in the center line direction around the position Y, and the length is such that the desired air consumption is achieved. This makes it possible to obtain a conveying force that allows the amount to be reduced. The details are as follows.

First, regarding the position Y, as described above, the position Y is the position where the line connecting the center 33 of the injection hole 10 and the position X intersects the periphery of the injection hole 10, and the position This is the position closest to the center 33 of the injection hole 10 among the positions on the periphery. Therefore, position Y is the position closest to the outer periphery of the sub-nozzle 2 among the positions on the periphery of the injection hole 10 .

In addition, when considering the position of the injection hole 10 in the front view, the direction perpendicular to the axis 14 of the sub-nozzle 2 (width direction) and the direction of the axis 14 of the sub-nozzle 2 (axial direction) are considered as follows: The position of is confirmed in the plane section. Note that, as described above, the sub-nozzle 2 of this embodiment is formed so that the planar cross-sectional shape is elliptical. Further, the wall thickness of a typical sub-nozzle is substantially uniform throughout. Thereby, the thickness direction (thickness direction) in the plane cross section forms a larger angle with respect to the thickness direction at the center position in the width direction as the position nearer to the outer periphery of the sub nozzle 2 increases. Become.

Therefore, when drilling the injection hole 10 with the center line direction as a specific direction, the thickness direction at the peripheral edge position of the injection hole 10 in the plane cross section is such that the position of the peripheral edge is the outer peripheral edge of the sub nozzle 2. The closer it is to the larger it is. In other words, in the plane section, the angle that the wall thickness direction at the peripheral edge of the injection hole 10 makes with the center line direction of the injection hole 10 is such that the position of the peripheral edge (the position of the center 33 of the injection hole 10) is The closer it is to the outer periphery of the sub nozzle 2, the larger it becomes.

When viewed at position Y, which is the closest position to the outer peripheral edge of the sub-nozzle 2 on the peripheral edge of the injection hole 10, the plane cross section at that position Y is shown in FIG. 8 (JJ cross-sectional view in FIG. 5). As such, the thickness direction at position Y forms an angle θa with respect to the center line direction. In this embodiment, the injection hole 10 is formed such that the distance C is 0.5 mm, but the angle θa becomes larger as the distance C becomes smaller (or smaller as the distance C becomes larger). The larger the angle θa is, the longer the inner circumferential surface 34 of the injection hole 10 at that position becomes longer in the center line direction.

Similarly, regarding the position of the injection hole 10 in the axial direction, a cross section in a direction parallel to the axial direction (a cross section when divided by the short axis 43 of the ellipse; hereinafter referred to as a "longitudinal cross section"). will be confirmed. Note that, as described above, the main body portion 12 of the sub-nozzle 2 is formed so that its tip forms an arc shape in the longitudinal section. Therefore, when the injection hole 10 is formed at a position near the outer periphery of the sub-nozzle on the periphery, the distance from the outer periphery is small (near), the portion (part) on the periphery is Located on a circular arc surface in the axial direction.

In such a case where a part of the periphery is located on a circular arc surface in the axial direction, and when the injection hole 10 is bored with the center line direction as a specific direction, the injection hole in the longitudinal section Regarding the wall thickness direction at the position of the peripheral edge of the hole 10, the closer the position of the peripheral edge is to the outer peripheral edge of the sub-nozzle 2, the larger the angle formed with the center line direction becomes. Then, when viewed at position Y, which is the position closest to the outer peripheral edge of the sub-nozzle 2 on the peripheral edge of the injection hole 10, the meat at position Y is seen as shown in FIG. 9 (HH cross-sectional view in FIG. 5). The thickness direction forms an angle θb with respect to the centerline direction. In this embodiment, the injection holes 10 are formed so that the distance C is 0.5 mm, but the angle θb becomes larger as the distance C becomes smaller (or smaller as the distance C becomes larger). The larger the angle θb is, the longer the inner circumferential surface 34 of the injection hole 10 at that position becomes longer in the center line direction.

In this way, by forming the injection hole 10 at a position where the distance C is small, the injection hole 10 is The length of the inner peripheral surface 34 becomes longer in the center line direction. As a result, the directivity of the airflow injected from the injection holes 10 increases, so that the weft conveying force for a predetermined supply pressure of compressed air is improved.

FIG. 10 is a graph showing the relationship between the distance C and the wind speed of compressed air injected from the sub-nozzle, which is largely related to the weft conveying force, for the sub-nozzle in which the injection hole is formed in this manner. Note that the graph shows cases where the pressure (supply pressure) of the compressed air supplied to the sub nozzle 2 is set to two different types (0.3 MPa, 0.4 MPa).

Furthermore, in the graph, the horizontal axis is the distance C, but the vertical axis uses the wind speed ratio as a parameter, not the wind speed itself. Note that the wind speed ratio is a ratio when the wind speed of the air flow injected from the injection hole of the comparison sub-nozzle is set to 100 at the same supply pressure. Further, the wind speed was measured at a predetermined position within the area where the air flow acts within the weft guide groove of the modified reed. The comparison sub-nozzle in this case has the injection hole formed at a position where the center of the injection hole is on the axis of the sub-nozzle and the distance C is 0.8 mm when looking at the front wall. This is a sub-nozzle with a different configuration.

As can be read from the graph in FIG. 10, the sub-nozzle of this example, in which the injection holes are formed so that the distance C is 0.5 mm, has a wind speed ratio of The value is 105 or more. That is, in the sub-nozzle 2 of this embodiment, since the injection holes 10 are formed so that the distance C is 0.5 mm, the wind speed ratio is increased by 5% or more. Therefore, according to the sub-nozzle 2 of this embodiment, it is possible to obtain a weft conveyance force that can achieve a desired reduction in air consumption.

Further, in this embodiment, the injection hole 10 is formed so that its center line 26 does not intersect with the axis 14 of the sub-nozzle 2, so the center line 26 of the injection hole 10 intersects with the axis 14 (in the plane section The angle that the center line 26 makes with respect to the thickness direction of the front wall portion 18 becomes larger than in the case where the center line 26 is formed so as to face the center of the sub-nozzle 2. As a result, the length of the inner circumferential surface 34 of the injection hole 10 in the center line direction becomes longer, so that the effect of improving the weft conveying force is achieved to a higher degree, and as a result, the effect becomes more effective. It is possible to reduce air consumption.

Furthermore, in this embodiment, since the injection hole 10 is formed to have the tapered portion 28, the length of the inner circumferential surface 34 of the injection hole 10 in the center line direction is longer than that of an injection hole that does not have a tapered portion. The length will be longer. Specifically, as described above, the center line direction of the injection hole 10 forms an angle with respect to the thickness direction of the front wall portion 18. In addition, the inner circumferential surface 34 of the injection hole 10 is formed so that the hole diameter gradually increases toward the inner surface 15, so that the injection hole is not formed in this way (it does not have a tapered part). ), the position of the inner opening 30 in the center line direction is closer to the rear wall 17 side. Therefore, the length of the inner circumferential surface 34 of the injection hole 10 in the center line direction is longer than when the injection hole does not have such a tapered portion. As a result, the effect of increasing the weft conveying force is achieved to a higher degree, and the air consumption can be reduced more effectively.

It should be noted that the present invention is not limited to the embodiments described above (the above-mentioned embodiments), but can also be implemented in the following modified embodiments.

(1) In the embodiment described above, the injection hole 10 is formed so that the diameter of the outer opening 31 is 1.6 mm. However, the sub-nozzle for an air-injection type loom according to the present invention is not limited to the one in which the hole diameter of the outer opening is formed as described above, and the sub-nozzle is not limited to the one in which the hole diameter of the outside opening is formed as described above. If the injection hole is formed so that the distance (distance C in the above example) is 0.75 mm or less, the injection hole is formed so that the hole diameter of the outer opening is different from that of the above example. It may be something that

(2) In the above embodiment, the injection hole has a straight portion whose inner circumferential surface is parallel to the center line of the injection hole, and a portion which is on the inner side of the straight portion and whose inner circumferential surface is parallel to the center line of the injection hole. The hole is formed to have a tapered portion formed so that the hole diameter gradually increases toward the inner surface. However, in the sub-nozzle according to the present invention, the injection hole is not limited to having such a tapered portion, but may be formed straight in the direction of its center line. Even in such a sub-nozzle, the inner circumferential surface of the injection hole is long in the center line direction at and around position Y, which is the position of the periphery of the injection hole, as described above.

Further, the injection hole may be formed so that its inner circumferential surface gradually increases in diameter toward the inner surface in the direction of its center line. In the sub-nozzle in which the injection hole is formed in this way, the length of the inner circumferential surface of the injection hole in the center line direction at position Y and its surroundings is longer than that in the sub-nozzle having a straight part as in the above embodiment. It will be a long one.

In addition, in the case of a configuration in which the injection hole has a tapered part on the inner surface side as described above, if the thickness of the tip part of the sub-nozzle remains uniform, the diameter of the tapered part will increase. Depending on the degree, a step may occur between the inner circumferential surface of the tapered portion and the inner surface of the tip portion of the sub-nozzle. Therefore, when such a step occurs, as shown in Fig. 11, at the inner position of the tip of the sub-nozzle where the step occurs, there is a Alternatively, a curved slope 35 may be formed.

(3) In the embodiment described above, the injection holes are formed so that the distance C is 0.5 mm. However, in the sub-nozzle according to the present invention, the position where the injection hole is formed is not limited to a position where the distance C is 0.5 mm, but may be any position where the distance C is 0.75 mm or less. The details are as follows.

In general, weaving factories are required to reduce air consumption in air-jet looms as part of energy conservation efforts. Moreover, regarding the amount of reduction, it is required to increase the wind speed ratio by 3% or more. As can be read from the graph of FIG. 10, if the distance C is 0.75 mm or less, the wind speed ratio will be a value greater than 103 for any of the two types of supply pressures. In other words, by forming the injection holes of the sub-nozzles so that the distance C is 0.75 mm or less, it is possible to improve the wind speed ratio at the rate required to reduce air consumption by 3% or more. It is possible to reduce air consumption as described above.

Regarding the distance C, the distance C is the distance between the position Y and the outer peripheral edge of the sub-nozzle in the front view, and as the distance becomes smaller, the wall thickness around the position Y of the sub-nozzle increases. Become thin. As the wall thickness becomes thinner, the sub-nozzle is more likely to be damaged. On the other hand, looking at the graph of FIG. 10, it can be seen that there is no change in the wind speed ratio when the distance C is 0.15 mm or less, regardless of whether the supply pressure is 0.3 MPa or 0.4 MPa. Therefore, it is desirable that the distance C be 0.15 mm or more.

(4) In the embodiment described above, the injection hole is formed so that its center line does not intersect with the axis of the sub-nozzle. However, in the sub-nozzle according to the present invention, except when the planar cross-sectional shape of the sub-nozzle is circular, the injection hole may be formed such that its center line intersects with the axis of the sub-nozzle. Even in such a sub-nozzle, the inner circumferential surface of the injection hole is long in the center line direction as described above in the thickness direction at and around position Y, which is the position of the periphery of the injection hole.

(5) In the above embodiment, when the injection hole is viewed from the front, a line (imaginary line 32/hereinafter referred to as "first imaginary line") passing through its center and position It forms an angle (specifically, an angle of about 70° with respect to the second imaginary line) with respect to a line (imaginary line 41/hereinafter referred to as "second imaginary line") perpendicular to the axis of the sub-nozzle. It is formed in a certain position. However, in the sub-nozzle of the present invention, the injection holes do not necessarily have to be formed at such positions.

For example, even if the first imaginary line is formed at a position such that it forms an angle with the axis of the sub-nozzle and the second imaginary line when viewed from the front, as in the embodiment, the angle is The injection hole may be formed at a position larger or smaller than the example.

Further, the injection hole may be formed in such a position that the center thereof is located away from the axis of the sub-nozzle when viewed from the front, and the first imaginary line is parallel to the second imaginary line. good. Even in this case, as is clear from the explanation regarding the relationship between the position Y of the injection hole in the width direction and the shape of the planar cross section (ellipse), as the distance C is reduced, The length of the inner circumferential surface of the injection hole at position Y and its surroundings becomes long in the center line direction.

(6) In the embodiments described above, the configuration of the sub-nozzle according to the present invention was explained as an example in which the injection hole was formed by a single hole. However, in the present invention, the sub-nozzle is not limited to one in which a single hole functions as an injection hole, but, for example, a plurality of holes are formed in an area where an injection hole is to be formed, and a collection of the plurality of holes functions as an injection hole. It may be configured to function as a hole. In that case, on the surface of the sub-nozzle, the area where the plurality of holes are open corresponds to the outer opening of the injection hole, and the center position of this area corresponds to the center of the injection hole. Moreover, in such a sub-nozzle, since each hole is bored in the same direction, the direction of the center line of the injection hole is the direction in which the hole is drilled.

Note that the present invention is not limited to the examples described above, and can be modified as appropriate without departing from the spirit thereof.

1 Main nozzle 2 Sub-nozzle 3 Modified reed 4 Reed blade 7 Weft guide groove 8 Reed holder 9 Nozzle holder 10 Injection hole 11 Base end portion 12 Main portion 14 Center axis line (axis line)
15 Inner surface 16 Outer surface 17 Rear wall 18 Front wall 26 Center line 27 Straight section 28 Tapered section 30 Inner opening 31 Outer opening 33 Center 35 Slope 40 Intermediate section 42 Long axis 43 Short axis

Claims (3)

In a sub-nozzle for an air injection loom, the sub-nozzle is a hollow tubular sub-nozzle having an arcuate tip and a closed end, the sub-nozzle having an injection hole formed at the tip,
When viewed in the direction of the center line of the injection hole, the position on the outer peripheral edge of the sub-nozzle that is closest to the center of the injection hole is defined as X, and a line connecting the center of the injection hole and the position X The position where Y intersects with the periphery of the injection hole is determined as Y, and
The injection hole is such that a line passing through the center of the injection hole and the position It is formed at a position closer to the deformed reed than the axis of the sub-nozzle , and is formed so that the distance between the position X and the position Y is 0.75 mm or less when viewed in the direction of the center line. A sub-nozzle for air-jet looms. The sub-nozzle for an air-injection type loom according to claim 1, wherein the injection hole is formed so that the center line does not intersect with the axis. The injection hole is formed so that its inner peripheral surface has a tapered portion that is a portion formed so that the hole diameter gradually increases toward the inner surface of the sub-nozzle. 2. The sub-nozzle for an air-jet loom according to item 2.

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