Weft insertion device for air jet loom

Abstract

To provide a constitution capable of diminishing turbulence of air current toward each of a pair of branch pipelines in a weft insertion device of an air-jetting type loom formed so that both branch pipelines direct front and rear directions of a loom, the weft insertion device provided with a plurality of supply devices each composed of one electromagnetic on-off valve and a distributor for distributing air supplied from a supply source through the electromagnetic on-off valve to two sub-nozzles, where the distributor includes the pair of branch pipelines one end of which communicates with the electromagnetic on-off valve, and the other end of which communicates with a main pipeline closed by an end wall and the other end side of the main pipeline, the pair of branch pipelines connected to a corresponding sub-nozzle.SOLUTION: Each branch pipeline communicates with a main pipeline so that at least one part opens to an end wall of the main pipe line.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a weft insertion device for an air jet loom equipped with a plurality of supply devices, each of which is made up of an electromagnetic valve and a distributor that distributes air supplied from a supply source via the electromagnetic valve to two sub-nozzles, in which the distributor includes a main duct having one end connected to the electromagnetic valve and the other end closed by a tip wall, and a pair of branch ducts connected to the other end of the main duct and to which corresponding sub-nozzles are connected, and both branch ducts are formed to face in the front-to-rear direction of the loom. [Background technology]

[0002] An example of such a weft insertion device for an air jet loom is disclosed in Patent Document 1. In the weft insertion device disclosed in Patent Document 1, a plurality of sub-nozzles for conveying the weft injected from the main nozzle into the warp shed are provided across the width of the loom. The weft insertion device also includes a plurality of supply devices for supplying air from a supply source to the sub-nozzles. In the weft insertion device, the sub-nozzles are grouped in units of several nozzles from the main nozzle side, and a corresponding supply device is connected to each group of sub-nozzles.

[0003] Each supply device is composed of one electromagnetic on-off valve and a distributor that distributes air from a supply source to multiple sub-nozzles via the electromagnetic on-off valve. Inside the distributor, a main pipe line, one end of which is connected to the electromagnetic on-off valve and the other end of which is closed by a tip wall, and multiple branch pipe lines, which are connected to the other end of the main pipe line and to which corresponding sub-nozzles are connected, are formed. Therefore, air supplied from the supply source to the supply device is sent to the main pipe line via the electromagnetic on-off valve, and then supplied to each sub-nozzle through each branch pipe line. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-239160 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the supply device of the weft insertion device disclosed in Patent Document 1, the branch pipe in the distributor is formed so as to open to the peripheral wall of the main pipe at the other end side of the main pipe. The air supplied from the electromagnetic valve to the main pipe flows in a direction along the axis of the main pipe (i.e., along the peripheral wall of the main pipe) toward the branch pipe. Therefore, in the configuration of Patent Document 1 (hereinafter referred to as the "conventional configuration"), most of the air that reaches the position of the branch pipe does not flow into the branch pipe, but flows toward the tip side of the branch pipe. Then, the air that flows toward the tip side bounces off the tip wall and flows toward the branch pipe, collides with the air from the electromagnetic valve, and flows into the branch pipe.

[0006] As described above, in the conventional configuration, the flow rate of air flowing toward the tip side (rebounding from the tip wall) is greater than that of the branch pipe, and as a result, the air from the electromagnetic valve side collides with the air that has rebounded from the tip wall, causing severe turbulence in the airflow. As a result of such severe turbulence in the airflow, there is a risk of problems occurring, such as adverse effects on weft insertion.

[0007] Furthermore, when the airflow to each branch pipe becomes severely turbulent in this way, it also causes a phenomenon in which it takes a long time for the injection pressure of the sub-nozzle to rise to the desired pressure. If it takes a long time for the injection pressure to rise, the timing to start the air supply (the timing to open the solenoid valve) must be made earlier in order for the injection pressure to rise to the desired pressure by the time the weft reaches the position of that sub-nozzle. This results in a problem of the injection period of the sub-nozzle becoming longer, and an increase in the amount of air consumed.

[0008] Therefore, an object of the present invention is to provide a weft insertion device configuration capable of reducing turbulence of air flow to each branch pipe line, thereby minimizing the effect of turbulence of air flow on weft insertion as much as possible and reducing the amount of air consumption. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides a weft insertion device as described above, characterized in that each branch pipe is connected to the main pipe in such a manner that at least a part of the branch pipe opens into a tip wall of the main pipe.

[0010] Furthermore, in the present invention, each branch pipe may be formed such that, as viewed in the weft insertion direction, the angle that the center line (a line that passes through the center of the pipe and extends in the extension direction of the pipe) of the branch pipe connected to the upstream sub-nozzle (first branch pipe) forms with the center line of the main pipe is larger than the angle that the center line of the branch pipe (second branch pipe) connected to the downstream sub-nozzle forms with the center line of the main pipe.

[0011] Furthermore, in the present invention, both branch pipes may be formed to overlap each other at the end portion on the main pipe side, and after both branch pipes are formed in this manner, each branch pipe may be formed such that the center of the inlet is located within the range in which the main pipe exists when viewed in the longitudinal direction of the main pipe. Effect of the Invention

[0012] According to the weft insertion device of the present invention, each branch duct is connected to at least a part of the tip wall of the main duct by opening therein, so that air introduced into the main duct and reaching the formation position of the branch duct can easily flow directly into each branch duct, compared to the conventional configuration. As a result, the amount of air bouncing off the tip wall of the main duct is reduced, compared to the conventional configuration, and the generation of an air flow that disturbs the air flow flowing into the branch duct from the main duct is suppressed.

[0013] Therefore, according to the configuration of the weft insertion device of the present invention, the airflow to each branch pipe is less likely to be disturbed (airflow disturbance is reduced), so that the influence of airflow disturbance on weft insertion is minimized. Also, by reducing airflow disturbance in this way, the time it takes for the jet pressure to rise to the desired pressure is shortened, so that the jet period of the sub-nozzles can be shortened, and the amount of air consumed can be reduced.

[0014] In addition, in the weft insertion device according to the present invention, the branch pipes are configured such that the angle of the first branch pipe is larger than that of the second branch pipe when viewed in the weft insertion direction, and the flow resistance of the first branch pipe to the air flowing in is smaller than that of the second branch pipe. This allows air to flow more smoothly into each branch pipe on the first branch pipe side. As a result, the time it takes for the jet pressure to reach a desired pressure is shorter for the upstream sub-nozzle than for the downstream sub-nozzle. Therefore, according to this configuration, the jet pressure of the upstream sub-nozzle, which is the side where the weft yarn arrives first, can be made to rise earlier than the jet pressure of the downstream sub-nozzle during weft insertion, thereby shortening the jet period of the sub-nozzles and thereby reducing the amount of air consumed.

[0015] Furthermore, in the weft insertion device according to the present invention, by forming both branch pipes to overlap each other at the end on the main pipe side, the spray pattern of air sprayed from each sub-nozzle can be made appropriate according to the pipe configuration, compared to a case in which both branch pipes are formed to be generally separated (independent).

[0016] Specifically, it is assumed that the ejection behavior, such as the rise in pressure, of the air ejected from the sub-nozzle corresponds to the pipeline configuration. However, this is premised on the premise that the flow of air into each of the branch pipelines corresponds to the pipeline configuration. However, when both branch pipelines are formed independently, at least in the initial stage when air starts to flow from the main pipeline into the branch pipeline, the flow rate of air flowing into each branch pipeline may not correspond to the pipeline configuration, causing a delay in the rise in the ejection pressure, and the ejection behavior from the sub-nozzle may not correspond to the pipeline configuration.

[0017] On the other hand, if the two branch pipes are formed to overlap each other at the end on the main pipe side, the branch pipes communicate with the main pipe at a common portion formed by the overlap. As a result, air supplied to the main pipe from the solenoid on-off valve side first flows into the common portion, and then flows from the common portion that is a part of each of the branch pipes into each portion downstream of that common portion. Therefore, with this configuration, compared to the case where the two branch pipes are formed independently, the flow rate of air flowing into each branch pipe in the initial stage corresponds to the pipe configuration, and the spray mode of air from the sub-nozzle can also be made appropriate according to the pipe configuration.

[0018] Furthermore, if the branch pipes are formed in an overlapping manner as described above, and each branch pipe is formed so that the center of the branch pipe inlet is located within the range of the main pipe when viewed in the longitudinal direction of the main pipe, each branch pipe will be in communication with the main pipe at a position closer to the tip wall. This allows air to flow into each branch pipe more smoothly than when the center of the branch pipe inlet is located outside the range of the main pipe. Therefore, with this configuration, the injection pressure of each sub-nozzle can be raised more quickly, further reducing air consumption. [Brief description of the drawings]

[0019] [Figure 1]FIG. 1 is a front view of a weft insertion device of an air jet loom according to an embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1. [Diagram 3] FIG. 2 is a cross-sectional view of FIG. [Figure 4] FIG. 4 is a front view of FIG. [Diagram 5] 5 is a side view of a main pipeline and a branch pipeline in the supply device of FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, one embodiment (example) of a weft insertion device for an air jet loom (hereinafter simply referred to as a "loom") according to the present invention will be described with reference to Figs. 1 to 5.

[0021] The loom 1 is equipped with a beating device 3 that drives a reed 5 to swing. In the beating device 3, the reed 5 is supported by a rocking shaft 11 via a sley 7 and a sley sword 9. The rocking shaft 11 is supported so as to be swingable, being installed between the loom frames. The loom frame is composed of a pair of side frames 12 (only one of which is shown in the drawing) that are spaced apart in the width direction of the loom 1 (direction parallel to the weft insertion direction), and multiple (generally four) beams that connect the side frames 12. However, the drawing only shows a front top stay 13, which is located at the upper end of the side frame 12 on the winding side of the woven fabric W from the cloth fell.

[0022] The loom 1 also includes a weft insertion device 2 for inserting a weft into a warp shed. The weft insertion device 2 has a main nozzle MN and multiple sub-nozzles SN. The main nozzle MN and multiple sub-nozzles SN are mounted on a sley 7. The multiple sub-nozzles SN are arranged side by side at predetermined intervals in the width direction. During weaving, air is supplied to each sub-nozzle SN for a preset period during the weft insertion period, and air is sprayed from each sub-nozzle SN.

[0023] The loom 1 is provided with an air tank for storing the air supplied to each of the sub-nozzles SN. In this embodiment, the front top stay 13 is used as the air tank. The front top stay 13 has a rectangular columnar appearance and is a hollow columnar body with a space inside. The front top stay (hereinafter also referred to as the "air tank") 13 has a supply hole 13a through which air with adjusted pressure is supplied from a supply source (not shown) via a regulator or the like, and air is supplied from the supply hole 13a to the inside.

[0024] In the weft insertion device 2, the sub-nozzles SN are grouped in pairs from the main nozzle MN side, and air is sprayed for each group. Therefore, the weft insertion device 2 has a plurality of supply devices 14 provided for each group of the sub-nozzles SN. In this embodiment, each supply device 14 is provided by being attached to the side wall of the air tank (front top stay) 13 via a screw member 20.

[0025] The supply device 14 is composed of an electromagnetic on-off valve 15 and a distributor 16 that distributes air supplied from the air tank 13 via the electromagnetic on-off valve 15 to the two sub-nozzles SN, SN. The distributor 16 has a supply pipe 17 formed to allow air from the air tank 13 to flow toward the electromagnetic on-off valve 15. The supply pipe 17 is formed in the distributor 16 so as to communicate at one end with the nozzle hole 13b formed in the air tank 13 when the supply device 14 is attached to the air tank 13. The supply pipe 17 is formed so as to communicate at the other end with the input port of the electromagnetic on-off valve 15.

[0026] Further, the distributor 16 has a main pipe 18 formed so as to communicate with the output port of the electromagnetic on-off valve 15 at one end and closed at the other end, and two branch pipes 19, 19 formed so as to communicate with the other end of the main pipe 18. Therefore, in the supply device 14, air introduced from the air tank 13 to the supply pipe 17 in the distributor 16 is introduced into the main pipe 18 and the branch pipe 19 via the electromagnetic on-off valve 15. Incidentally, in the supply device 14, the electromagnetic on-off valve 15 and the distributor 16 are provided integrally. Also, the main pipe 18 in the distributor 16 is formed so that its tip wall 18a is a plane parallel to a direction perpendicular to the longitudinal direction of the main pipe 18.

[0027] Moreover, the supply device 14 is connected to the two corresponding sub-nozzles SN, SN by tubes 22 that are connected to each branch pipe 19 via pipe joints 21. As a result, air introduced into each branch pipe 19 is supplied to each sub-nozzle SN via each tube 22.

[0028] As described above, the supply device 14 in the weft insertion device 2 is configured to supply the air introduced from the air tank 13 into the distributor 16 to the two sub-nozzles SN, SN by branching it in the branch pipe 19. In the present invention, each branch pipe 19 is formed to communicate with the main pipe 18 in such a manner that at least a part of the branch pipe 19 is open to the tip wall 18a, which is the wall on the other end side of the main pipe 18 that is closed. In addition, this embodiment is an example in which the two branch pipes 19, 19 are formed to overlap each other at the end on the main pipe 18 side. The supply device 14 of this embodiment will be described in detail below.

[0029] In the supply device 14, the two branch pipes 19, 19 are formed to open at the tip wall 18a of the main pipe 18. As shown in Fig. 3, the two branch pipes 19, 19 are formed to face rearward in the front-to-rear direction of the loom (the rocking shaft 11 side relative to the air tank 13) and obliquely upward when viewed in the weft insertion direction. As shown in Fig. 4, the two branch pipes 19, 19 are formed to be inclined to the left and right at the same angle β with respect to the center line of the main pipe 18 when viewed in the front-to-rear direction.

[0030] In addition, as shown in FIG. 4, the branch pipes 19a and 19b are formed so as to overlap each other at their ends on the main pipe 18 side. As a result, each branch pipe 19 communicates with the main pipe 18 at a common portion formed by the overlapping. In addition, the branch pipes 19a and 19b (the common portion) are formed so as to open to the tip wall 18a of the main pipe 18 as described above, but in this embodiment, they are formed so as to open to the peripheral wall 18b of the main pipe 18 in part (the opening straddles the tip wall 18a and the peripheral wall 18b). However, most of the opening is on the tip wall 18a side, so that the center of the end (inlet) of each branch pipe 19 on the main pipe 18 side is present on the tip wall 18a side. That is, the center of the inlet of each branch pipe 19 is located within the range in which the main pipe 18 exists as viewed in the longitudinal direction of the main pipe 18.

[0031] In this embodiment, the branch pipes 19 are formed such that the center line of the first branch pipe 19a (the left branch pipe 19 in FIG. 4) which is a branch pipe connected to the upstream sub-nozzle SN of the two sub-nozzles SN in each group and the center line of the second branch pipe 19b (the right branch pipe 19 in FIG. 4) which is a branch pipe connected to the downstream sub-nozzle SN intersect on the center line of the main pipe 18. Furthermore, as shown in FIG. 5, both branch pipes 19a, 19b are formed such that the angle α1 that the center line of the first branch pipe 19a makes with the center line of the main pipe 18 is larger than the angle α2 that the center line of the second branch pipe 19b makes with the center line of the main pipe 18 when viewed in the weft insertion direction.

[0032] In the weft insertion device 2 of the present embodiment described above, each branch pipe 19 in the supply device 14 (distributor 16) is formed so that most of it opens to the tip wall 18a of the main pipe 18. Therefore, according to the weft insertion device 2 in which the supply device 14 is so configured, air introduced into the main pipe 18 and reaching the formation position of the branch pipe 19 can easily flow directly into each branch pipe 19, compared to a conventional configuration in which each branch pipe in the distributor opens only to the peripheral wall of the main pipe. As a result, the flow rate of air bouncing off the tip wall 18a of the main pipe 18 is reduced compared to the conventional configuration, and disturbance of the air flow flowing into the branch pipe 19 is suppressed as much as possible.

[0033] As a result, the airflow supplied to the sub-nozzle SN through each branch pipe 19 can be made as turbulent as possible, and the effect of turbulence on the weft insertion due to the turbulence of the airflow can be reduced. Furthermore, by reducing the turbulence of the airflow in this way, the time it takes for the jet pressure of the sub-nozzle SN to rise to the desired pressure is also shortened, so that the jet period of the sub-nozzle SN can be shortened, and the amount of air consumed can be reduced.

[0034] Furthermore, in this embodiment, the angle α1 between the center line of the first branch pipe 19a and the center line of the main pipe 18 is larger than the angle α2 between the center line of the second branch pipe 19b and the center line of the main pipe 18 when viewed in the weft insertion direction. With such a pipe configuration of each branch pipe 19, the flow resistance of each branch pipe 19 to the air flowing in is smaller in the first branch pipe 19a than in the second branch pipe 19b. Therefore, the air flows into each branch pipe 19 more smoothly on the first branch pipe 19a side. As a result, the time until the jet pressure rises to a desired pressure is shorter for the upstream sub-nozzle SN than for the downstream sub-nozzle SN. In other words, during weft insertion, the jet pressure of the upstream sub-nozzle SN, which is the side where the weft yarn arrives earlier, rises earlier than the jet pressure of the downstream sub-nozzle SN. Therefore, with this configuration, the ejection period of the sub-nozzles SN for each group can be made shorter, and in turn, the amount of air consumed can be reduced.

[0035] Moreover, in this embodiment, the branch pipes 19a, 19b communicate with the main pipe 18 at the common portion formed by overlapping each other at the ends on the main pipe 18 side. As a result, air introduced into the main pipe 18 first flows into the common portion, and then flows from the common portion that forms part of each branch pipe 19 to each portion downstream of the common portion. According to this configuration, the flow rate of air flowing into each branch pipe 19 becomes appropriate according to the pipe configuration, at least in the initial stage when air starts to flow from the main pipe side into the branch pipe, compared to the case where the branch pipes 19, 19 are formed independently. As a result, the injection mode of the air injected from the sub-nozzle SN, such as the pressure rise at least in the initial stage, can be made appropriate according to the pipe configuration.

[0036] Furthermore, in this embodiment, the branch pipes 19a, 19b are formed in an overlapping manner as described above, and are formed so that the center of the inlet of the branch pipe 19 is located within the range of the main pipe 18 when viewed in the longitudinal direction of the main pipe 18. That is, each branch pipe 19 is in communication with the main pipe 18 at a position closer to the tip wall 18a. This allows air to flow into each branch pipe 19 more smoothly than when the center of the inlet of the branch pipe 19 is located outside the range of the main pipe 18. Therefore, with this configuration, the injection pressure of each sub-nozzle SN rises more quickly, and the amount of air consumed can be further reduced.

[0037] The above describes one embodiment of the weft insertion device of a loom to which the present invention is applied (hereinafter, referred to as the "embodiment"). However, the present invention is not limited to the configuration described in the embodiment, and can be embodied in other embodiments (variations) as follows.

[0038] (1) Regarding the opening positions of the branch pipes relative to the distal end wall of the main pipe, in the above embodiment, both of the two branch pipes 19a, 19b are formed so that their openings straddle the distal end wall 18a and the peripheral wall 18b. However, in the present invention, the two branch pipes are not limited to being formed in such a shape, and one or both of them may be formed so as to open only on the distal end wall.

[0039] In the above embodiment, both of the two branch pipes 19a and 19b are formed so that the majority of the openings to the main pipe 18 are on the tip wall 18a side. However, in the present invention, it is sufficient that at least a portion of the two branch pipes open to the tip wall. That is, one or both of the two branch pipes may be formed so as to open more toward the peripheral wall side than the tip wall side. In that case, the center of the inlet of the branch pipe formed so as to open more toward the peripheral wall side is located outside the existence range of the main pipe when viewed in the longitudinal direction of the main pipe. Thus, in the present invention, the two branch pipes are not limited to being formed so that the centers of both inlets are located within the existence range of the main pipe 18 as in the above embodiment when viewed in the longitudinal direction of the main pipe, but may be formed so that the center of at least one inlet is located outside the existence range of the main pipe 18.

[0040] (2) Regarding the relationship between the two branch pipes, in the above embodiment, the two branch pipes 19a, 19b are formed to overlap each other at the end on the main pipe 18 side. However, in the present invention, the two branch pipes are not limited to being formed in this manner, and may be formed independently (separately) from each other, including the opening positions relative to the main pipe.

[0041] (3) Regarding the direction in which the two branch pipes are formed, in the above embodiment, the two branch pipes 19a, 19b are formed such that, as viewed in the weft insertion direction, the angle α1 between the center line of the first branch pipe 19a and the center line of the main pipe 18 is larger than the angle α2 between the center line of the second branch pipe 19b and the center line of the main pipe 18. However, in the present invention, the two branch pipes may be formed to form the same angle with the center line of the main pipe as viewed in the weft insertion direction.

[0042] In the above embodiment, both branch pipes 19a, 19b are formed so as to be inclined to the left and right at the same angle β with respect to the center line of the main pipe 18 when viewed in the front-rear direction of the loom. However, in the present invention, the two branch pipes may be formed so as to be inclined to the left and right at different angles with respect to the center line of the main pipe when viewed in the front-rear direction.

[0043] Furthermore, in the above embodiment, each branch pipe 19 is formed such that the center lines of the two branch pipes 19a, 19b intersect. The two branch pipes 19a, 19b are also formed such that both center lines intersect with the center line of the main pipe 18, and the position where the center lines of the branch pipes 19a, 19b intersect is on the center line of the main pipe 18. However, in the present invention, the two branch pipes are not limited to being formed in this manner.

[0044] For example, even if the center lines of both branch pipelines are formed to intersect, the intersection may be at a position other than the center line of the main pipeline. Also, the center lines of both branch pipelines may be formed to intersect, and only the center line of one of the branch pipelines may intersect with the center line of the main pipeline. Furthermore, the center lines of both branch pipelines may be formed so that they do not intersect, and in that case, one or both center lines may be formed so that they intersect with the center line of the main pipeline, or both center lines may be formed so that they do not intersect with the center line of the main pipeline.

[0045] (4) Regarding the method of providing the supply device, in the above embodiment, the supply device 14 is provided in a form directly attached to the side wall of the front top stay 13. However, in the present invention, the supply device is not limited to being directly attached to the front top stay in this manner.

[0046] For example, the supply device may be provided by using a support member such as a bracket and attaching it to the front top stay via the support member. In this case, the nozzle hole of the front top stay and the supply pipe in the distributor of the supply device are connected via a pipe joint, tube, etc.

[0047] In addition, when the supply device is provided using the support member in this way, the degree of freedom in the arrangement and orientation of the supply device in the front-rear direction is increased compared to the case of the above-mentioned embodiment. Therefore, in this case, instead of providing the branch pipe 19 facing backward as in the above-mentioned embodiment, it is also possible to provide the supply device so that the branch pipe faces forward when viewed in the weft insertion direction.

[0048] Furthermore, in the above embodiment, the supply device 14 is configured such that the distributor 16 is configured so that the branch pipe 19 is directed obliquely upward (the branch pipe 19 is formed in the distributor 16) in consideration of the installation state such as the installation position and installation state. However, when the supply device is installed using a support member as described above, the branch pipe may be configured so that the branch pipe is directed horizontally (front-rear direction) or obliquely downward in the above installation state. In other words, the direction of the branch pipe in the supply device in the above installation state may include the front-rear direction, and may be horizontal or obliquely downward, not limited to the obliquely upward direction of the above embodiment. Furthermore, with regard to the orientation directions of obliquely upward, horizontal, and obliquely downward, the supply device (distributor) is not limited to being configured so that both branch pipes are directed in the same direction, and one branch pipe and the other branch pipe may be configured to be directed in different directions.

[0049] (5) Regarding the main pipe, in the above embodiment, the main pipe 18 is formed so that its tip wall 18a is a plane parallel to a direction perpendicular to the longitudinal direction of the main pipe 18. However, in the present invention, the main pipe is not limited to being formed so that its tip wall forms such a plane. For example, the main pipe may be formed so that its tip portion forms a cone shape, in which case the tip wall of the main pipe is formed so as to be inclined with respect to the longitudinal direction of the main pipe.

[0050] (6) In the present invention, the pipelines (main pipeline and branch pipelines) in the distributor may be formed so that their cross-sectional shape is circular, elliptical, or polygonal.

[0051] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0052] 1. Loom 2 Weft Insertion Device MN Main nozzle SN Sub-nozzle 3. Reed beating device 5. Reed 7. Sleigh 9 Slay Sword 11 Locking shaft 12 Side frame 13 Front top stay (air tank) 13a Supply hole 13b Blowout hole 14 Feeding device 15 Solenoid valve 16 Distributor 17 Supply pipeline 18 Main pipeline 18a End wall 18b Surrounding wall 19a Branch pipe (first branch pipe) 19b Branch pipe (second branch pipe) 21 Pipe fittings 22 Tube

Claims

1. A weft insertion device for an air jet loom comprising a plurality of supply devices each including an electromagnetic valve and a distributor for distributing air supplied from a supply source via the electromagnetic valve to two sub-nozzles, the distributor including a main pipe having one end connected to the electromagnetic valve and the other end closed by a tip wall, and a pair of branch pipes connected to the other end of the main pipe and to which the corresponding sub-nozzles are connected, the branch pipes being oriented in the front-rear direction of the loom, Each of the branch pipes is connected to the main pipe in such a manner that at least a portion of the branch pipe opens to the tip wall. A weft insertion device characterized by:

2. When viewed in the weft insertion direction, each of the branch pipes is formed such that an angle formed by a center line of the branch pipe connected to the sub-nozzle on the upstream side and a center line of the main pipe is larger than an angle formed by a center line of the branch pipe connected to the sub-nozzle on the downstream side and a center line of the main pipe.

2. The weft insertion device according to claim 1 .

3. The branch pipes are formed so as to overlap each other at the ends on the main pipe side.

3. The weft insertion device according to claim 1 or 2.

4. Each of the branch pipes is formed such that the center of the inlet is located within the range in which the main pipe exists when viewed in the longitudinal direction of the main pipe.

4. The weft insertion device according to claim 3.

Images