Air-jet loom

Abstract

To provide an air-jet loom capable of reducing a load which occurs in a supply pipe.SOLUTION: An air-jet loom 100 comprises a base 10, a sley 13, a sub-nozzle S as an air nozzle, and a sub-nozzle supply pipe 40 as a supply pipe. The sub-nozzle supply pipe 40 connects between the sub-nozzle S supported by the sley 13 and a second solenoid on-off valve 22 disposed on the base 10. The sub-nozzle supply pipe 40 has a preformed bent part 43. As a result, the air-jet loom 100 can reduce the load which occurs in the sub-nozzle supply pipe 40.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an air-jet loom.

Background Art

[0002] For example, Patent Document 1 discloses a jet room which is an air-jet loom including a heald frame, a reed, and a base including an air tank. Further, Patent Document 1 discloses a jet room which is an air-jet loom including a main nozzle for weft insertion and an auxiliary nozzle for weft insertion which are air nozzles, an electromagnetic on-off valve, and a flexible tube which is a supply pipe.

[0003] A heald frame is erected on the reed, and the main nozzle for weft insertion and the auxiliary nozzle for weft insertion are attached thereto. The electromagnetic on-off valve is attached to the air tank. The main nozzle for weft insertion and the auxiliary nozzle for weft insertion are connected by an electromagnetic on-off valve for controlling the supply of air and a flexible tube.

[0004] In the air-jet room, the weft yarn ejected by the main nozzle for weft insertion is pulled by relay injection by the auxiliary nozzle for weft insertion, and then flies through the weft insertion passage which is the passage inside the heald frame formed on the heald frame. The inserted weft yarn is beaten by the swinging of the heald frame.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The heddle frame beats the weft yarn due to the oscillation of the sley. That is, the beating of the weft yarn is accompanied by the oscillation of the air nozzle supported by the sley. The electromagnetic on-off valve connected to the air nozzle is attached to a place that does not oscillate during beating, such as a base. Therefore, the supply pipe connected to the air nozzle is swung in the direction in which the heddle frame oscillates due to the oscillation of the air nozzle.

[0007] That is, due to the oscillation of the air nozzle, a load is applied to the supply pipe that supplies air to the air nozzle. The load applied to the supply pipe may lead to breakage of the supply pipe. In an air-jet loom, it is desired to reduce the load applied to the supply pipe due to the oscillation of the air nozzle.

Means for Solving the Problem

[0008] An air-jet loom for solving the above problems includes a sley that supports a heddle frame and extends in the weft insertion direction of the weft yarn, an air nozzle supported by the sley, an electromagnetic on-off valve supported by a base, and a supply pipe that connects the air nozzle and the electromagnetic on-off valve. The heddle frame is an air-jet loom that beats the weft yarn by oscillating together with the sley, and the gist is that the supply pipe has a pre-formed bent portion.

[0009] According to this, the supply pipe has a pre-formed bent portion even in a situation where it is not provided in the air-jet loom. By providing the bent portion in the supply pipe in advance, the air-jet loom can reduce the load generated in the supply pipe when attaching the supply pipe to the air nozzle and the electromagnetic on-off valve.

[0010] Also, an air jet loom weaves by beating a weft yarn with a reed by swinging the reed. Due to the swinging of the reed, the supply pipe deforms with elongation or bending. A load corresponding to the magnitude of the deformation occurs in the supply pipe. In a preformed supply pipe, elongation or bending occurs due to the swinging of the air nozzle with reference to the shape having a bent portion. That is, the deformation occurring in the supply pipe is small compared to, for example, the case where the supply pipe is linear in a situation where the supply pipe is not provided in the air jet loom. In other words, the load occurring in the supply pipe having a bent portion is reduced by the preformed bent portion. From the above, the air jet loom can reduce the load occurring in the supply pipe by having a preformed bent portion in the supply pipe.

[0011] The air nozzle may be a sub-nozzle that injects air into the weft yarn inserted into the in-reed passage provided in the reed. According to this, the supply pipe connects an electromagnetic on-off valve that controls the supply of air to the sub-nozzle and the sub-nozzle provided on the reed. Also, the supply pipe is bent at the bent portion even in a situation where it is not connected to the electromagnetic on-off valve and the sub-nozzle. The supply pipe connecting the electromagnetic on-off valve and the sub-nozzle is bent more greatly in a situation where it is provided in the air jet loom compared to, for example, the supply pipe connecting the electromagnetic on-off valve and the main nozzle. That is, the air jet loom can reduce the load more greatly by providing a preformed bent portion in the supply pipe connecting the electromagnetic on-off valve and the sub-nozzle than by providing a bent portion in the supply pipe connecting to the main nozzle.

[0012] In the above air jet loom, the supply pipe may be preformed into a shape that connects the electromagnetic on-off valve and the sub-nozzle supported by the reed when the reed is located at the center of the range in which the reed swings.

[0013] The load generated in the supply pipe increases as the deformation from the shape in the state where the supply pipe is not connected to the electromagnetic on-off valve and the sub-nozzle increases. Therefore, the smaller the deformation of the supply pipe, the smaller the load generated in the supply pipe. In particular, in the supply pipe connecting the electromagnetic on-off valve and the sub-nozzle, the deformation caused by the swing of the sley is minimized when the supply pipe has in advance the shape when the sley is at the center of the swing range. That is, the air jet loom can reduce the load in the supply pipe connecting the electromagnetic on-off valve and the sub-nozzle generated by the swing of the sley by having the supply pipe with the above configuration.

[0014] In the air jet loom, the bent portion may include a first turning portion that changes the flow direction of the air flowing in from the electromagnetic on-off valve within a plane orthogonal to the weft insertion direction, and a second turning portion that changes the flow direction of the air that has passed through the first turning portion within a plane orthogonal to the weft insertion direction.

[0015] According to this, the supply pipe deforms at each of the first turning portion and the second turning portion as the sley swings. The air introduced into the supply pipe from the electromagnetic on-off valve changes its flow direction in the flow path defined by the first turning portion and then flows into the flow path defined by the second turning portion. Further, the air that has flowed into the flow path defined by the second turning portion changes its flow direction in the flow path defined by the second turning portion and is then supplied to the sub-nozzle. For example, in the supply pipe connecting the electromagnetic on-off valve and the sub-nozzle, when the supply pipe has only one bent portion that bends from the electromagnetic on-off valve toward the sub-nozzle, the deformation of the supply pipe accompanying the swing of the sley concentrates on this portion, which is not preferable. That is, by providing each of the first turning portion and the second turning portion, the supply pipe can disperse the load associated with the deformation occurring in the supply pipe due to the swing of the sley.

[0016] In the air jet loom, the bent portion may be preformed into a shape connecting the electromagnetic on-off valve and the sub-nozzle at different positions in the weft insertion direction. According to this, even when the electromagnetic on-off valve and the sub-nozzle are at different positions in the weft insertion direction, the bent portion can reduce the load on the supply pipe due to the swing of the sley. For example, when a plurality of sub-nozzles are connected to one electromagnetic on-off valve, the electromagnetic on-off valve and each sub-nozzle will not be at the same position in the weft insertion direction. That is, the above configuration can reduce the load generated in the supply pipe due to the swing of the sley even when a plurality of sub-nozzles are connected to one electromagnetic on-off valve.

[0017] In the above air jet loom, the supply pipe may be pre-formed into a shape having a central axis perpendicular to the weft insertion direction. According to this, the supply pipe extends in a direction perpendicular to the weft insertion direction. The supply pipe with the above configuration is, for example, easier to produce than a supply pipe that also extends in the weft insertion direction. That is, the air jet loom can improve the productivity of the supply pipe while reducing the load generated in the supply pipe when the sley swings by having a supply pipe with a central axis perpendicular to the weft insertion direction.

[0018] In the above air jet loom, the air nozzle may be a main nozzle that inserts the weft yarn into a reed inner passage provided in the reed. According to this, the supply pipe connects an electromagnetic on-off valve that controls the supply of air to the main nozzle and a main nozzle provided on the sley. That is, each of the main nozzle and the supply pipe swings with the sley when the air nozzle swings. According to the above configuration, when the sley swings, the supply pipe connecting the electromagnetic on-off valve and the main nozzle undergoes deformation involving elongation and bending. By having a pre-formed bent portion, the supply pipe can, for example, reduce the deformation of the supply pipe due to the swing of the sley compared to a case where the supply pipe connecting the electromagnetic on-off valve and the main nozzle does not have a bent portion. That is, the bent portion can reduce the load generated in the supply pipe. As a result, the air jet loom can reduce the load generated in the supply pipe connecting the electromagnetic on-off valve and the main nozzle due to the swing of the sley.

[0019] In the air jet loom, there is a relay provided between the electromagnetic on-off valve and the main nozzle and provided on the sley. The supply pipe has a first connection supply pipe connecting the electromagnetic on-off valve and the relay, and a second connection supply pipe connecting the relay and the main nozzle. The bent portion may be preformed on the first connection supply pipe.

[0020] According to the above configuration, between the main nozzle and the electromagnetic on-off valve, the first connection supply pipe has a bent portion. That is, for example, compared with the case where the main nozzle and the electromagnetic on-off valve are connected by a single preformed pipe, the preformed portion is less. As a result, the air jet loom can reduce the manufacturing cost.

Effect of the Invention

[0021] According to the present invention, the load generated in the supply pipe can be reduced.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0023] Hereinafter, an embodiment in which the air jet loom is embodied will be described with reference to FIGS. 1 to 6. <Air Jet Loom> As shown in FIGS. 1, 2, and 3, the air jet loom 100 includes a base 10 and a weft insertion device 20. The base 10 includes an air tank 11 and a pair of side frames 14.

[0024] The air jet loom 100 has a rocking shaft 12, a reed 13, and a heddle 15 provided on the reed 13. The air jet loom 100 inserts the weft yarn Y by causing the weft yarn Y to fly in the weft insertion direction W by the weft insertion device 20. The width direction of the air jet loom 100 coincides with the weft insertion direction W. The air jet loom 100 weaves the woven fabric C by beating the inserted weft yarn Y with the reed 15. The woven fabric C is formed by the weft yarn Y and warp yarns T extending in the front-rear direction F orthogonal to the weft insertion direction W. In the air jet loom 100, the vertical direction U is a direction orthogonal to each of the weft insertion direction W and the front-rear direction F. Hereinafter, in the weft insertion direction W, the traveling direction of the flying weft yarn Y is described as the "downstream" side, and the opposite side is described as the "upstream" side. That is, the weft yarn Y flies from the upstream side to the downstream side in the weft insertion direction W. Also, in the front-rear direction F, the direction in which the woven fabric C is wound is described as the "front" side, and the opposite direction to the front side across the air jet loom 100 is described as the "rear" side.

[0025] <Base> As shown in FIGS. 1 and 2, the air tank 11 is in a long shape extending longitudinally in the width direction of the air jet loom 100. That is, the air tank 11 extends in the weft insertion direction W. Each end in the longitudinal direction of the air tank 11 is supported by the side frame 14. The air tank 11 is supported by a pair of side frames 14 provided apart from each other in the width direction of the air jet loom 100 and is installed on the pair of side frames 14. And the air tank 11 functions as a beam member of the loom frame that extends in the width direction of the air jet loom 100 and is fixedly provided.

[0026] The air tank 11 has a hollow interior of a beam extending between a pair of side frames 14 as an air storage space. Specifically, a tank chamber 11a is formed inside the air tank 11. The air tank 11 is supplied with compressed air from a pressure source (not shown) and stores the compressed air in the tank chamber 11a.

[0027] <Rocking shaft, sley, and reed> As shown in FIG. 3, the rocking shaft 12 is cylindrical and extends in the width direction of the air jet loom 100. That is, the rocking shaft 12 extends in the weft insertion direction W. The rocking shaft 12 is installed on a pair of side frames 14. Both ends of the rocking shaft 12 in the extending direction are supported by the pair of side frames 14 via bearings (not shown) so that the rocking shaft 12 can rotate around its axis. The rocking shaft 12 rotates with respect to the pair of side frames 14 with an axis extending in the weft insertion direction W as a rotation axis.

[0028] The rocking shaft 12 is integrally provided with an arm 12a extending above the air jet loom 100 in the vertical direction U. The sley 13 is supported at the upper end of the arm 12a. The sley 13 extends in the width direction of the air jet loom 100. That is, the sley 13 extends in the weft insertion direction W of the weft yarn Y. The sley 13 rotates integrally with the rocking shaft 12. When the rocking shaft 12 rotates with respect to the pair of side frames 14, the sley 13 swings in the front-rear direction F. The sley 13 is above the air tank 11 in the vertical direction U and is behind the air tank 11 in the front-rear direction F.

[0029] As shown in FIGS. 1 and 2, the air jet loom 100 includes a reed 15. The reed 15 is supported by a sley 13. The lower end of the reed 15 is fixed to the sley 13. In other words, the sley 13 supports the reed 15. The reed 15 is formed by a plurality of reed blades 15a arranged in a row in the weft insertion direction W. In other words, the plurality of reed blades 15a are arranged in the width direction of the air jet loom 100. Note that FIG. 3 shows only one of the plurality of reed blades 15a.

[0030] As shown in FIGS. 1 and 2, the plurality of reed blades 15a are arranged at intervals in the weft insertion direction W on the sley 13. Each reed blade 15a is supported by the sley 13 by fixing the lower end of each reed blade 15a to the sley 13. In other words, a plurality of gaps are formed in the reed 15 in the weft insertion direction W. The warp threads T pass through the gaps.

[0031] A passage 15b is formed in the reed 15. In other words, the passage 15b is provided in the reed 15. The passage 15b extends in the weft insertion direction W of the air jet loom 100. That is, the passage 15b extends in the direction in which the reed blades 15a are arranged. The passage 15b opens at both ends of the reed 15 in the direction in which the reed blades 15a are arranged.

[0032] The reed 15 swings back and forth in the front-rear direction F together with the sley 13 by means of the rocking shaft 12. The reed 15 swings together with the sley 13 to beat the weft yarn Y. In other words, the air-jet loom 100 beats the weft yarn Y by swinging the reed 15 back and forth in the front-rear direction F. As shown in FIG. 6, the sley 13 swings between a position where the reed 15 is in the first posture P1 and a position where the reed 15 is in the second posture P2. In FIG. 6, the reed 15 and the sub-nozzle S in the first posture P1 are shown by a one-dot chain line, and the reed 15 and the sub-nozzle S in the second posture P2 are shown by a two-dot chain line. The reed 15 swings along the circumferential direction of the rocking shaft 12. When the reed 15 is in the second posture P2, the reed 15 contacts the front of the loom C1. The reed 15 beats the weft yarn Y by assuming the second posture P2 together with the weft yarn Y flying through the reed passage 15b. The position of the sley 13 where the reed 15 is in the first posture P1 is the position that is most retracted in the front-rear direction F from the position where the reed 15 is in the second posture P2 within the range in which the sley 13 swings. In other words, the sley 13 swings within a range from the position where the reed 15 is in the first posture P1 to the position where the reed 15 is in the second posture P2.

[0033] <Weft insertion device> As shown in FIG. 1, the weft insertion device 20 includes a main nozzle M, a sub-nozzle S as an air nozzle, a first electromagnetic on-off valve 21, and a second electromagnetic on-off valve 22 as an electromagnetic on-off valve.

[0034] <Main nozzle, and first electromagnetic on-off valve> The main nozzle M is provided on the sley 13. In other words, the sley 13 supports the main nozzle M. Therefore, the main nozzle M swings back and forth in the front-rear direction F together with the sley 13. The main nozzle M is provided on the sley 13 at the most upstream side in the weft insertion direction W. More specifically, the main nozzle M is provided on the sley 13 upstream of the reed 15 in the weft insertion direction W.

[0035] The main nozzle M injects air supplied from a pressure supply source (not shown) to eject the weft yarn Y into the passage 15b inside the reed. That is, the main nozzle M inserts the weft yarn Y into the passage 15b inside the reed provided in the reed 15. The weft yarn Y ejected into the passage 15b inside the reed flies through the passage 15b in the weft insertion direction W. That is, the air jet loom 100 inserts the weft yarn Y into the passage 15b inside the reed by the main nozzle M. In other words, the weft insertion direction W is the direction in which the weft yarn Y ejected by the main nozzle M flies.

[0036] The main nozzle M is connected to a pressure supply source (not shown) via the first electromagnetic on-off valve 21. The first electromagnetic on-off valve 21 is provided on the base 10. For example, the first electromagnetic on-off valve 21 is provided in the air tank 11. Note that the first electromagnetic on-off valve 21 does not have to be provided in the air tank 11. The first electromagnetic on-off valve 21 controls the supply of air to the main nozzle M. The first electromagnetic on-off valve 21 and the main nozzle M are connected by the main nozzle supply pipe 31. That is, the air jet loom 100 has the main nozzle supply pipe 31. The air flowing into the first electromagnetic on-off valve 21 from the pressure supply source is supplied to the main nozzle M via the main nozzle supply pipe 31. The main nozzle supply pipe 31 is, for example, a flexible tube.

[0037] <Sub-nozzle and second electromagnetic on-off valve> As shown in FIG. 2, the air jet loom 100 includes a plurality of sub-nozzles S. The sub-nozzle S is provided on the front side of the sley 13. The sley 13 supports the sub-nozzle S. The sub-nozzle S swings in the front-rear direction F together with the sley 13. As shown in FIG. 6, the sub-nozzle S is provided at a position where it does not contact each of the front of the reed C1 and the woven fabric C when the reed 15 is in the second posture P2.

[0038] As shown in FIG. 3, the sub-nozzle S has a supply port Sa at its first end and an injection port Sb at its second end. Air is supplied from the air tank 11 to the supply port Sa. The injection port Sb injects the air supplied to the supply port Sa. That is, the sub-nozzle S injects the air supplied from the air tank 11 to the supply port Sa from the injection port Sb toward the inside passage 15b of the reed. In other words, the sub-nozzle S injects air onto the weft yarn Y inserted into the inside passage 15b of the reed. Therefore, in the present embodiment, the air nozzle is the sub-nozzle S that injects air onto the weft yarn Y inserted into the inside passage 15b of the reed. The injection direction of the air from the sub-nozzle S is along the weft insertion direction W. The weft yarn Y is pulled by the air injected from the sub-nozzle S and travels through the inside passage 15b of the reed.

[0039] As shown in FIG. 1, a plurality of second electromagnetic on-off valves 22 are attached to the air tank 11. That is, the second electromagnetic on-off valve 22 is provided on the base 10. The second electromagnetic on-off valve 22 is attached to the rear surface of the outer surface of the air tank 11. That is, the second electromagnetic on-off valve 22 is located below the sley 13 in the vertical direction U. In other words, the second electromagnetic on-off valve 22 is located below the sub-nozzle S. Also, the second electromagnetic on-off valve 22 is located in front of the sley 13 in the front-rear direction F. In other words, the second electromagnetic on-off valve 22 is located in front of the sub-nozzle S.

[0040] As shown in FIGS. 1 and 2, the second electromagnetic on-off valve 22 has an inflow port (not shown), a first outflow port 22a, and a second outflow port 22b. The first outflow port 22a and the second outflow port 22b are provided at the upper part of the second electromagnetic on-off valve 22 and are at the same position in the vertical direction U. Also, each of the first outflow port 22a and the second outflow port 22b is located below the sub-nozzle S. Air flows into the second electromagnetic on-off valve 22 from the air tank 11 through an inflow port (not shown). The air that has flowed into the second electromagnetic on-off valve 22 flows out from the first outflow port 22a and the second outflow port 22b.

[0041] As shown in FIGS. 2 and 4, in the second electromagnetic on-off valve 22, the first outflow port 22a opens to the rear side in the front-rear direction F. In other words, the opening direction of the first outflow port 22a is the front-rear direction F. In the second electromagnetic on-off valve 22, the second outflow port 22b opens to the downstream side in the weft insertion direction W and the rear side in the front-rear direction F of the first outflow port 22a in a plane orthogonal to the vertical direction U. In other words, the second outflow port 22b opens in a direction different from that of the first outflow port 22a when viewed from the vertical direction U.

[0042] The second electromagnetic on-off valve 22 can be switched between an excited state in which the inflow port communicates with each of the first outflow port 22a and the second outflow port 22b, and a demagnetized state in which the inflow port is blocked from each of the first outflow port 22a and the second outflow port 22b. The second electromagnetic on-off valve 22 is connected to a control device (not shown) and switches between the excited state and the demagnetized state according to a signal from the control device. The control device can individually control each of the plurality of second electromagnetic on-off valves 22. For example, the control device can set one of the plurality of second electromagnetic on-off valves 22 to the excited state and the other second electromagnetic on-off valves 22 to the demagnetized state. That is, the second electromagnetic on-off valve 22 controls the supply of air from the air tank 11 to the sub-nozzle S.

[0043] The second electromagnetic on-off valve 22 supplies air to the sub-nozzle S through each of the first outflow port 22a and the second outflow port 22b. That is, two sub-nozzles S are connected to one second electromagnetic on-off valve 22. Of the two sub-nozzles S connected to the second electromagnetic on-off valve 22, one is designated as the first sub-nozzle S1 and the other is designated as the second sub-nozzle S2. Air flowing out from the first outflow port 22a is supplied to the first sub-nozzle S1. Air flowing out from the second outflow port 22b is supplied to the second sub-nozzle S2.

[0044] As shown in FIG. 4, the first sub-nozzle S1 is slightly downstream in the weft insertion direction W from the second electromagnetic on-off valve 22. The second sub-nozzle S2 is provided downstream in the weft insertion direction W from the second electromagnetic on-off valve 22 and the first sub-nozzle S1. That is, the second sub-nozzle S2 is at a different position from the second electromagnetic on-off valve 22 in the weft insertion direction W.

[0045] The distance between the sub-nozzle S and the second electromagnetic on-off valve 22, in each of the front-rear direction F and the vertical direction U, changes with the oscillation of the sley 13. That is, the distance between the sub-nozzle S and the second electromagnetic on-off valve 22 changes due to the oscillation of the sub-nozzle S. When the sley 13 is at the position where the reed 15 is in the first posture P1, the distance in the front-rear direction F between the sub-nozzle S and the second electromagnetic on-off valve 22 becomes the largest. Also, when the sley 13 is at the position where the reed 15 is in the second posture P2, the distance in the front-rear direction F between the sub-nozzle S and the second electromagnetic on-off valve 22 becomes the smallest. In the process of the reed 15 moving from the first posture P1 to the second posture P2, the distance in the vertical direction U between the sub-nozzle S and the second electromagnetic on-off valve 22 becomes the largest at the position where the extending direction of the reed blade 15a coincides with the vertical direction U.

[0046] As shown in FIG. 6, in the circumferential direction of the rocking shaft 12, the position intermediate between the position of the sley 13 where the reed 15 is in the first posture P1 and the position of the sley 13 where the reed 15 is in the second posture P2 is the position of the sley 13 where the reed 15 is in the reference posture PP. In other words, the reference posture PP is the posture taken by the reed 15 when the sley 13 is at the center of the range in which it oscillates. The angle formed between the direction in which the reed blade 15a extends in the first posture P1 and the direction in which the reed blade 15a extends in the reference posture PP is equal to the angle formed between the direction in which the reed blade 15a extends in the reference posture PP and the direction in which the reed blade 15a extends in the second posture P2. In other words, the reed 15 in the reference posture PP is separated from each of the reed 15 in the first posture P1 and the reed 15 in the second posture P2 by the same distance in the circumferential direction of the rocking shaft 12.

[0047] <Sub-nozzle supply pipe> The air jet loom 100 has a sub-nozzle supply pipe 40. The sub-nozzle supply pipe 40 is a flexible and bent cylindrical pipe. The sub-nozzle S and the second electromagnetic on-off valve 22 are connected by the sub-nozzle supply pipe 40. In other words, the sub-nozzle supply pipe 40 connects the sub-nozzle S and the second electromagnetic on-off valve 22. The sub-nozzle supply pipe 40 has a first pipe end portion 41 on the first end side, a second pipe end portion 42 on the second end side, and a bent portion 43 other than the first pipe end portion 41 and the second pipe end portion 42. The sub-nozzle supply pipe 40 is made of, for example, synthetic resin. The bent shape of the sub-nozzle supply pipe 40 is formed by, for example, thermoforming.

[0048] Each of the first pipe end portion 41 and the second pipe end portion 42 extends linearly. The sub-nozzle supply pipe 40 has a first opening 41a that opens at the first pipe end portion 41 and a second opening 42a that opens at the second pipe end portion 42. Inside the sub-nozzle supply pipe 40, an internal flow path 40c that communicates the first opening 41a and the second opening 42a is formed. The internal flow path 40c opens at the first opening 41a and the second opening 42a. In FIG. 5, the central axis L of the sub-nozzle supply pipe 40 is shown by a dashed line. The central axis L is also the axis of the internal flow path 40c.

[0049] The first opening 41a is connected to either the first outflow port 22a or the second outflow port 22b of the second electromagnetic on-off valve 22. Air is supplied to the sub-nozzle supply pipe 40 from the second electromagnetic on-off valve 22 through the first opening 41a. The second opening 42a is connected to the supply port Sa of the sub-nozzle S. The sub-nozzle supply pipe 40 introduces the air supplied from the first opening 41a to the sub-nozzle S through the internal flow path 40c from the second opening 42a. The air that has flowed into the sub-nozzle supply pipe 40 from the first opening 41a reaches the second opening 42a after flowing through the internal flow path 40c.

[0050] The bent portion 43 is a portion of the sub-nozzle supply pipe 40 that is different from both the first pipe end portion 41 and the second pipe end portion 42. The bent portion 43 is pre-formed in the sub-nozzle supply pipe 40. In other words, the sub-nozzle supply pipe 40 has the pre-formed bent portion 43.

[0051] Here, the sub-nozzle supply pipe 40 removed from the air-jet loom 100 will be described. The sub-nozzle supply pipe 40 removed from the air-jet loom 100 is in a situation where the first pipe end portion 41 and the second electromagnetic on-off valve 22 are not connected, and the second pipe end portion 42 and the sub-nozzle S are not connected. In this situation, no load is generated on the sub-nozzle supply pipe 40. When the sub-nozzle supply pipe 40 in this situation is deformed by applying a load, from the time when the application of the load is stopped, it returns to the shape before being deformed by the load as time passes. The shape of the sub-nozzle supply pipe 40 not connected to each of the second electromagnetic on-off valve 22 and the sub-nozzle S is defined as the natural shape N. That is, the sub-nozzle supply pipe 40 deformed from the natural shape N becomes the natural shape N after being deformed in the direction of restoring the natural shape N.

[0052] When the sub-nozzle supply pipe 40 attached to the air-jet loom 100 is in the natural shape N, the sub-nozzle supply pipe 40 does not bias each of the second electromagnetic on-off valve 22 and the sub-nozzle S. In other words, when the sub-nozzle supply pipe 40 is not in the natural shape N, the sub-nozzle supply pipe 40 biases each of the second electromagnetic on-off valve 22 and the sub-nozzle S. The shape of the sub-nozzle supply pipe 40 in this case is defined as the biased shape A. The sub-nozzle supply pipe 40 can be deformed from the natural shape N to the biased shape A by the swing of the reed 13.

[0053] The sub-nozzle supply pipe 40 has a natural shape N that connects the second electromagnetic on-off valve 22 and the sub-nozzle S in a situation where the weir 15 is in the reference posture PP. In other words, the sub-nozzle supply pipe 40 is pre-formed into a shape that connects the second electromagnetic on-off valve 22 and the sub-nozzle S in a situation where the weir 15 is in the reference posture PP. That is, the sub-nozzle supply pipe 40 is pre-formed into a shape that connects the second electromagnetic on-off valve 22 and the sub-nozzle S supported by the slay 13 at the center of the range where the slay 13 swings.

[0054] The bending portion 43 has each of a first turning portion 43a and a second turning portion 43b. The first turning portion 43a is a portion on the first pipe end portion 41 side among the bending portion 43. The second turning portion 43b is a portion on the second pipe end portion 42 side among the bending portion 43. Each of the first turning portion 43a and the second turning portion 43b defines a part of the internal flow path 40c. Each of the first turning portion 43a and the second turning portion 43b bends a part of the internal flow path 40c that it defines. Among the internal flow path 40c, the first turning portion 43a defines a first turning flow path 43c. Among the internal flow path 40c, the second turning portion 43b defines a second turning flow path 43d. In FIG. 5, each of a first boundary B1 between the first pipe end portion 41 and the first turning portion 43a, a second boundary B2 between the first turning portion 43a and the second turning portion 43b, and a third boundary B3 between the second turning portion 43b and the second pipe end portion 42 is indicated by a two-dot chain line.

[0055] The first turning flow path 43c changes the flow direction of the air flowing in from the second electromagnetic on-off valve 22 through the first opening 41a in the front-rear direction F when viewed from the weft insertion direction W. In other words, air flowing into the first turning portion 43a from the second electromagnetic on-off valve 22 flows inside. More specifically, the air passing through the first turning flow path 43c changes the flow direction viewed from the weft insertion direction W from backward to forward in the front-rear direction F before and after passing through the first turning flow path 43c. That is, the flow direction of the air flowing in from the first opening 41a is changed by the first turning portion 43a from backward in the front-rear direction F to forward in the front-rear direction F when viewed from the weft insertion direction W. Therefore, the first turning portion 43a changes the flow direction of the air supplied from the second electromagnetic on-off valve 22 in the front-rear direction F when viewed from the weft insertion direction W. In other words, the first turning portion 43a changes the flow direction of the air flowing inside within a plane orthogonal to the weft insertion direction W.

[0056] The second turning flow path 43d changes the flow direction of the air that has passed through the first turning flow path 43c in the front-rear direction F when viewed from the weft insertion direction W. More specifically, the air passing through the second turning flow path 43d changes the flow direction viewed from the weft insertion direction W from forward to backward in the front-rear direction F before and after passing through the second turning flow path 43d. Therefore, the second turning portion 43b changes the flow direction of the air flowing in from the first turning portion 43a in the front-rear direction F when viewed from the weft insertion direction W. In other words, the second turning portion 43b changes the flow direction of the air flowing inside within a plane orthogonal to the weft insertion direction W. The air whose flow direction has been changed by the second turning portion 43b is introduced into the second opening 42a. That is, the second turning portion 43b introduces the air that has passed through the first turning portion 43a into the sub-nozzle S. Each of the first turning flow path 43c and the second turning flow path 43d guides the air flowing in from the first opening 41a upward along the central axis L. That is, the sub-nozzle supply pipe 40 connects the second electromagnetic on-off valve 22 and the sub-nozzle S that are at different positions in the vertical direction U.

[0057] The second electromagnetic on-off valve 22 is connected to a first sub-nozzle supply pipe 401 that connects to the first outflow port 22a and a second sub-nozzle supply pipe 402 that connects to the second outflow port 22b. When air flows into the first sub-nozzle supply pipe 401 from the first outflow port 22a through the first opening 41a, the air is supplied to the supply port Sa of the first sub-nozzle S1 through the second opening 42a. That is, the second electromagnetic on-off valve 22 supplies air to the first sub-nozzle S1 through the first sub-nozzle supply pipe 401. When air flows into the second sub-nozzle supply pipe 402 from the second outflow port 22b through the first opening 41a, the air is supplied to the supply port Sa of the second sub-nozzle S2 through the second opening 42a. That is, the second electromagnetic on-off valve 22 supplies air to the second sub-nozzle S2 through the second sub-nozzle supply pipe 402.

[0058] As shown in FIG. 4, the second electromagnetic on-off valve 22 is slightly upstream in the weft insertion direction W from the first sub-nozzle S1. When the second electromagnetic on-off valve 22 is at the same position as the first sub-nozzle S1 in the weft insertion direction W, the sub-nozzle supply pipe 40 has a two-dimensional shape in a plane orthogonal to the weft insertion direction W. Also, when the second electromagnetic on-off valve 22 is slightly downstream in the weft insertion direction W from the first sub-nozzle S1, the shape of the first sub-nozzle supply pipe 401 is also included in the two-dimensional shape.

[0059] The first sub-nozzle supply pipe 401 connects the first outflow port 22a and the supply port Sa of the first sub-nozzle S1. The first sub-nozzle S1 is slightly upstream in the weft insertion direction W from the first outflow port 22a. In this case, the first sub-nozzle supply pipe 401 has a bent portion 43 in the natural shape N that changes the flow direction of the air supplied from the second electromagnetic on-off valve 22 in the front-rear direction F and causes the air to flow upward in the up-down direction U. The first sub-nozzle supply pipe 401 has the pre-formed bent portion 43.

[0060] The first sub-nozzle supply pipe 401 hardly allows air to flow in the weft insertion direction W in the internal flow path 40c. In this case, the first sub-nozzle supply pipe 401 is preformed into a shape having a central axis L orthogonal to the weft insertion direction W. Even when the first sub-nozzle S1 is slightly downstream in the weft insertion direction W with respect to the second electromagnetic on-off valve 22, the first sub-nozzle supply pipe 401 can connect the second electromagnetic on-off valve 22 and the first sub-nozzle S1 with hardly any deformation.

[0061] The second electromagnetic on-off valve 22 is upstream in the weft insertion direction W from the second sub-nozzle S2 in the weft insertion direction W. That is, the second sub-nozzle supply pipe 402 connects a second outflow port 22b at a different position in the weft insertion direction W and a supply port Sa of the second sub-nozzle S2. Therefore, the second sub-nozzle supply pipe 402 has a bent portion 43 that changes the flow direction of the air supplied from the second electromagnetic on-off valve 22 in the front-rear direction F and causes the air to flow upward in the vertical direction U and downstream in the weft insertion direction W in the natural shape N. In other words, the second sub-nozzle supply pipe 402 has a bent portion 43 that is preformed into a shape connecting the second electromagnetic on-off valve 22 and the sub-nozzle S at different positions in the weft insertion direction W.

[0062] <Weaving by the air jet loom 100> As shown in FIG. 1, during the operation of the air jet loom 100, the weft yarn Y is ejected by the main nozzle M and travels through the reed inner passage 15b in the weft insertion direction W. During this travel, each of the plurality of sub-nozzles S provided in the weft insertion device 20 ejects the air supplied from the air tank 11 in the travel direction of the weft yarn Y. The sub-nozzles S perform relay injection from the upstream side to the downstream side in the weft insertion direction W. This relay injection pulls the weft yarn Y ejected into the opening of the warp yarn T. The relay injection is performed by switching the excitation state and the demagnetization state of the plurality of second electromagnetic on-off valves 22 by a control device (not shown). The supply of air to the sub-nozzles S is performed via the second electromagnetic on-off valves 22 and the sub-nozzle supply pipes 40.

[0063] The weft yarn Y inserted by the weft insertion device 20 is beaten against the reed 15 that swings together with the sley 13 in the front of the loom C1. When the sley 13 swings, the sub-nozzle S also swings together with the sley 13. In other words, the distance in the front-rear direction F between the sub-nozzle S and the second electromagnetic on-off valve 22 changes. This leads to the deformation of the sub-nozzle supply pipe 40 from its natural shape N. The air jet loom 100 weaves the woven fabric C by this beating.

[0064] [Operation of the present embodiment] The operation of the present embodiment will be described. When the sub-nozzle S swings, the sub-nozzle supply pipe 40 with the bending part 43 pre-formed deforms based on the shape of the bending part 43. In other words, the deformation occurring in the sub-nozzle supply pipe 40 due to the swing of the sub-nozzle S occurs as a change from the pre-formed bending part 43. That is, a load corresponding to the change from the bending part 43 is generated in the sub-nozzle supply pipe 40 due to the swing of the sub-nozzle S.

[0065] [Effect of the present embodiment] The effect of the present embodiment will be described. (1) The sub-nozzle supply pipe 40 has the pre-formed bending part 43 even in a situation where it is not provided in the air jet loom 100. By providing the bending part 43 in the sub-nozzle supply pipe 40 in advance, the air jet loom 100 can reduce the load on the sub-nozzle supply pipe 40 that occurs when the sub-nozzle supply pipe 40 is attached to the sub-nozzle S and the second electromagnetic on-off valve 22.

[0066] Further, the sub-nozzle supply pipe 40 with the bent portion 43 pre-formed deforms due to the swing of the sub-nozzle S, based on the shape having the bent portion 43. That is, the deformation occurring in the sub-nozzle supply pipe 40 is small compared to the case where the sub-nozzle supply pipe 40 is linear in a situation where it is not provided in the air-jet loom 100. In other words, the load occurring in the sub-nozzle supply pipe 40 with the bent portion 43 is reduced by the pre-formed bent portion 43. From the above, the air-jet loom 100 can reduce the load occurring in the sub-nozzle supply pipe 40 by having the sub-nozzle supply pipe 40 with the pre-formed bent portion 43.

[0067] (2) Along with the swing of the reed 13, the sub-nozzle supply pipe 40 deforms in the front-rear direction F in which the sub-nozzle S and the second electromagnetic on-off valve 22 are aligned. In other words, the sub-nozzle supply pipe 40 deforms in the direction in which the reed 13 swings. In the sub-nozzle supply pipe 40, the direction in which the bent portion 43 is pre-bent coincides with the direction of the deformation occurring in the sub-nozzle supply pipe 40 due to the swing of the sub-nozzle S. As a result, the deformation of the bent portion 43 caused by the swing of the sub-nozzle S becomes smaller compared to the case where the bent portion 43 is formed in a direction different from the direction in which it deforms due to the swing of the sub-nozzle S, for example. As a result, the sub-nozzle supply pipe 40 can reduce the load occurring in the bent portion 43 by having the pre-formed bent portion 43.

[0068] (3) The load occurring in the sub-nozzle supply pipe 40 increases as the deformation from the natural shape N becomes larger. For this reason, the smaller the deformation of the sub-nozzle supply pipe 40, the smaller the load occurring in the sub-nozzle supply pipe 40. Due to the swing of the sub-nozzle S, the deformation occurring in the sub-nozzle supply pipe 40 becomes the smallest when the shape at the center of the range in which the reed 13 swings is taken as the natural shape N. That is, the air-jet loom 100 can reduce the load in the sub-nozzle supply pipe 40 caused by the swing of the reed 13 by pre-forming the natural shape N in the sub-nozzle supply pipe 40.

[0069] (4) The sub-nozzle supply pipe 40 includes each of the first turning portion 43a and the second turning portion 43b. Thus, for example, compared with the case of having only one of the first turning portion 43a and the second turning portion 43b, the load associated with deformation can be dispersed. As a result, in the air jet loom 100, when the sub-nozzle S swings, the load associated with the deformation occurring in the bending portion 43 can be reduced because the sub-nozzle supply pipe 40 has the first turning portion 43a and the second turning portion 43b.

[0070] (5) The second sub-nozzle supply pipe 402 is preformed in a shape that connects the second electromagnetic on-off valve 22 and the sub-nozzle S at different positions in the weft insertion direction W. That is, even when one second electromagnetic on-off valve 22 controls the supply of air to two sub-nozzles S, the air jet loom 100 can reduce the load occurring in the second sub-nozzle supply pipe 402 that connects the second electromagnetic on-off valve 22 and each sub-nozzle S.

[0071] (6) The first sub-nozzle supply pipe 401 has a central axis L orthogonal to the weft insertion direction W in the natural shape N. The first sub-nozzle supply pipe 401 is easier to produce compared to, for example, a pipe preformed to be bent in the weft insertion direction W. That is, by having the first sub-nozzle supply pipe 401 with the central axis L orthogonal to the weft insertion direction W, the air jet loom 100 can reduce the load generated in the sub-nozzle supply pipe 40 during the swing of the reed 13 and improve the productivity of the sub-nozzle supply pipe 40.

[0072] (7) The sub-nozzle supply pipe 40 is bent significantly in the situation where it is provided in the air jet loom 100 compared to, for example, the main nozzle supply pipe 31. That is, by providing the bending portion 43 in the sub-nozzle supply pipe 40 in advance, the air jet loom 100 can reduce the load more significantly than, for example, providing the bending portion 43 in the main nozzle supply pipe 31.

[0073] [Modified Example] Incidentally, the above-described embodiment can be implemented with the following modifications. The above-described embodiment and the following modification examples can be implemented in combination with each other as long as they do not technically conflict with each other.

[0074] ○ The air jet loom 100 may be provided with only one sub-nozzle supply pipe 40 that connects the sub-nozzle S and the second electromagnetic on-off valve 22. In this case, only the first sub-nozzle supply pipe 401 may be provided. In this case, all the sub-nozzle supply pipes 40 have bent portions 43 of the same shape in the natural shape N.

[0075] ○ The air jet loom 100 may connect the second outflow port 22b and the second sub-nozzle S2 with the first sub-nozzle supply pipe 401. In this case, two first sub-nozzle supply pipes 401 are attached to the second electromagnetic on-off valve 22.

[0076] ○ The air jet loom 100 may connect the first outflow port 22a and the first sub-nozzle S1 with the second sub-nozzle supply pipe 402. In this case, two second sub-nozzle supply pipes 402 are attached to the second electromagnetic on-off valve 22.

[0077] ○ The first turning portion 43a may change the flow direction of the air flowing inside in the weft insertion direction W. Also, the second turning portion 43b may change the flow direction of the air flowing inside in the weft insertion direction W. In short, the shapes of the first turning portion 43a and the second turning portion 43b may be appropriately changed so as to reduce the load generated in the sub-nozzle supply pipe 40.

[0078] ○ The sub-nozzle supply pipe 40 may not be provided with each of the first turning portion 43a and the second turning portion 43b at the bent portion 43. For example, the sub-nozzle supply pipe 40 may have only one portion that bends from the second electromagnetic on-off valve 22 toward the sub-nozzle S. Also, the sub-nozzle supply pipe 40 may be provided with three or more turning portions at the bent portion 43 so as to connect the second electromagnetic on-off valve 22 and the sub-nozzle S.

[0079] ○ The shape of the sub-nozzle supply pipe 40 that connects the second electromagnetic on-off valve 22 and the sub-nozzle S supported by the sley 13 at the center of the range where the sley 13 swings does not necessarily need to be pre-formed. For example, the sub-nozzle supply pipe 40 may be pre-formed into the shape of the sub-nozzle supply pipe 40 in a situation where the reed 15 is in either the first posture P1 or the second posture P2 as the natural shape N.

[0080] ○ The natural shape N of the sub-nozzle supply pipe 40 does not necessarily need to be a shape that the sub-nozzle supply pipe 40 can take during the swinging process of the sley 13. In other words, the bent portion 43 pre-formed in the sub-nozzle supply pipe 40 does not necessarily need to be a shape realized during the swinging process of the sley 13.

[0081] ○ The bent portion 43 may be pre-formed in the main nozzle supply pipe 31. In other words, the main nozzle supply pipe 31 has a pre-formed bent portion 43. That is, the air nozzle of the air-jet loom 100 may be the main nozzle M that inserts the weft yarn Y into the in-reed passage 15b provided in the reed 15.

[0082] The main nozzle M is provided on the sley 13. That is, the main nozzle M swings together with the sley 13 when the sley 13 swings. When the sley 13 swings, the main nozzle supply pipe 31 deforms with elongation or bending in the front-rear direction F. The load generated in the main nozzle supply pipe 31 increases as the deformation of the main nozzle supply pipe 31 becomes larger. By having the pre-bent bent portion 43, the main nozzle supply pipe 31 can reduce the deformation of the main nozzle supply pipe 31 accompanying the swinging of the sley 13 compared to, for example, the case where the main nozzle supply pipe 31 does not have the bent portion 43. That is, the bent portion 43 can reduce the load generated in the main nozzle supply pipe 31. As a result, the air-jet loom 100 can reduce the load generated in the main nozzle supply pipe 31 accompanying the swinging of the sley 13.

[0083] ○ The air jet loom 100 may have a relay D interposed between the main nozzle M and the first electromagnetic on-off valve 21. In this case, as shown in FIG. 7, the air jet loom 100 has a relay D interposed between the first electromagnetic on-off valve 21 and the main nozzle M. The relay D is provided on the sley 13.

[0084] In this case, the main nozzle M is connected to the first electromagnetic on-off valve 21 via the main nozzle supply pipe 31. The main nozzle supply pipe 31 has a first connection supply pipe 311 connecting the first electromagnetic on-off valve 21 and the relay D, and a second connection supply pipe 312 connecting the relay D and the main nozzle M. The first electromagnetic on-off valve 21 is provided on either one of the pair of side frames 14. Note that the first electromagnetic on-off valve 21 may not be provided on the pair of side frames 14. In short, the first electromagnetic on-off valve 21 may be provided on the base 10.

[0085] The first connection supply pipe 311 has a pre-formed bent portion 43. The bent shape in the situation where the first electromagnetic on-off valve 21 and the relay D are connected to the first connection supply pipe 311 is pre-formed. In this case, compared with the case where the entire main nozzle supply pipe 31 is pre-formed, the portion to be pre-formed becomes shorter. That is, by forming the bent portion 43 in advance in the first connection supply pipe 311 of the main nozzle supply pipe 31, the production cost of the main nozzle supply pipe 31 can be reduced.

[0086] Also, in this case, the relay D is provided on the sley 13. That is, along with the swing of the sley 13, the deformation is limited to the portion of the first connection supply pipe 311 among the main nozzle supply pipe 31. Therefore, by dividing the main nozzle supply pipe 31 into the first connection supply pipe 311 and the second connection supply pipe 312 and connecting the two with the relay D, the air jet loom 100 can reduce the production cost of the main nozzle supply pipe 31 and reduce the load generated in the main nozzle supply pipe 31 due to the swing of the main nozzle M.

[0087] ○ The bent portion 43 may be pre-formed on each of the main nozzle supply pipe 31 and the sub-nozzle supply pipe 40. Alternatively, the bent portion 43 may be pre-formed on the main nozzle supply pipe 31 and not pre-formed on the sub-nozzle supply pipe 40.

[0088] ○ The air nozzle does not have to be the main nozzle M and the sub-nozzle S. For example, the air nozzle may be a stretch nozzle or an air tacker supported by the sley 13. That is, the supply pipe on which the bent portion 43 is pre-formed is not limited to the main nozzle supply pipe 31 and the sub-nozzle supply pipe 40. In short, the supply pipe only needs to connect an air nozzle supported by the sley 13 and an electromagnetic on-off valve supported by the base 10. For example, when a stretch nozzle and an electromagnetic on-off valve are connected in the supply pipe, the bent portion 43 of the supply pipe is pre-formed into a shape connecting the stretch nozzle and the electromagnetic on-off valve. From the above, the air nozzle to which the supply pipe having the pre-formed bent portion is connected may be other than the main nozzle M and the sub-nozzle S as long as it is an air nozzle supported by the sley 13, and may be, for example, a stretch nozzle or an air tacker.

[0089] [Appendix] The technical idea understood from the above-described embodiment and modification examples is described below. (A) An air jet loom having a sley that supports a reed and extends in the weft insertion direction of the weft yarn, an air nozzle supported by the sley, an electromagnetic on-off valve supported by a base, and a supply pipe that connects the air nozzle and the electromagnetic on-off valve, wherein the reed performs reed beating of the weft yarn by swinging together with the sley, and the supply pipe has a bent portion that takes a natural shape without biasing each of the electromagnetic on-off valve and the air nozzle, and the bent portion can be deformed into a biasing shape that biases each of the electromagnetic on-off valve and the air nozzle by the swinging of the sley.

Explanation of Signs

[0090] 10…Base, 13…Sley, 15…Reed, 15b…Inner passage of the reed, 21…First electromagnetic valve as an electromagnetic on-off valve, 22…Second electromagnetic valve as an electromagnetic on-off valve, 31…Main nozzle supply pipe as a supply pipe, 40…Sub-nozzle supply pipe as a supply pipe, 43…Bending part, 43a…First turning part, 43b…Second turning part, 100…Air jet loom, 311…First connecting supply pipe, 312…Second connecting supply pipe, D…Repeater, L…Central axis, M…Main nozzle as an air nozzle, S…Sub-nozzle as an air nozzle, W…Weft insertion direction, Y…Weft yarn.

Claims

1. A reed support, a sley extending in the weft insertion direction of the weft yarn, an air nozzle supported by the sley, a solenoid valve supported by a base, and a supply pipe connecting the air nozzle and the solenoid valve, and the reed performs reed beating of the weft yarn by swinging together with the sley, and is an air jet loom, wherein the supply pipe has a preformed bent portion, characterized by the air jet loom.

2. The air jet loom according to claim 1, wherein the air nozzle is a sub-nozzle that injects air into the weft yarn inserted into the in-reed passage provided in the reed.

3. The air jet loom according to claim 2, wherein the supply pipe is preformed in a shape connecting the solenoid valve and the sub-nozzle supported by the sley when the sley is located at the center of the range in which the sley swings.

4. The bent portion has a first turning portion that changes the flow direction of the air flowing in from the solenoid valve in a plane orthogonal to the weft insertion direction, and a second turning portion that changes the flow direction of the air that has passed through the first turning portion in a plane orthogonal to the weft insertion direction, characterized by the air jet loom according to claim 2 or claim 3.

5. The air jet loom according to claim 2 or claim 3, wherein the bent portion is preformed in a shape connecting the solenoid valve and the sub-nozzle at different positions in the weft insertion direction.

6. The air jet loom according to claim 2 or claim 3, wherein the supply pipe is preformed in a shape having a central axis orthogonal to the weft insertion direction.

7. The air jet loom according to claim 1, wherein the air nozzle is a main nozzle that inserts the weft yarn into the in-reed passage provided in the reed.

8. having a relay provided between the solenoid valve and the main nozzle and provided on the sley, and the supply pipe has a first connection supply pipe connecting the solenoid valve and the relay, and a second connection supply pipe connecting the relay and the main nozzle, wherein the bent portion is preformed in the first connection supply pipe, characterized by the air jet loom according to claim 7.

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