Air jet loom

Abstract

Provided is an air jet loom capable of reducing a load generated at a supply pipe. An air jet loom (100) includes 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. A sub-nozzle supply pipe (40) connects a sub-nozzle S supported by the sley (13) to a second electromagnetic on-off valve (22) provided on the base (10). The sub-nozzle supply pipe (40) has a pre-formed bent portion (43). As a result, the air jet loom (100) can reduce the load generated at the sub-nozzle supply pipe (40).

Description

Technical Field

[0001] The present invention relates to air-jet looms. Background Art

[0002] For example, Patent Document 1 discloses a projectile loom as an air-jet loom, which includes a profile reed, a reed base, and a base including an air tank. In addition, Patent Document 1 discloses a projectile loom (jet loom) as an air-jet loom, which includes a main nozzle for weft insertion and an auxiliary nozzle for weft insertion as air nozzles, an electromagnetic on-off valve, and a flexible tube as a supply pipe.

[0003] A profile reed is erected on the reed base, and a main nozzle for weft insertion and an auxiliary nozzle for weft insertion are assembled. The electromagnetic on-off valve is installed in the air tank. The main nozzle for weft insertion and the auxiliary nozzle for weft insertion are connected to the electromagnetic on-off valve that controls the supply of air through a flexible tube.

[0004] In an air-jet loom, the weft yarn ejected from the main nozzle for weft insertion is towed by a relay jet formed by the auxiliary nozzle for weft insertion, and thus travels in a passage within the reed, i.e., a weft insertion passage, formed at the profile reed. The weft yarn being inserted is beaten up by the swinging of the profile reed.

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-239160

[0006] The profile reed beats up the weft yarn by the swinging of the reed base. In other words, the beating-up of the weft yarn is accompanied by the swinging of the air nozzle supported by the reed base. The electromagnetic on-off valve connected to the air nozzle is installed at a part that does not swing during beating-up, such as the base. Therefore, the supply pipe connected to the air nozzle swings in the direction of the swinging of the profile reed due to the swinging of the air nozzle.

[0007] In other words, due to the swinging 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 cause 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 swinging of the air nozzle. Summary of the Invention

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

[0009] Accordingly, the supply pipe has a preformed bent portion even when not installed on the air-jet loom. By pre-setting the bent portion on the supply pipe, when the air-jet loom installs the supply pipe at the air nozzle and the electromagnetic on-off valve, the load generated at the supply pipe can be reduced.

[0010] In addition, the air-jet loom performs weaving by beating up the weft yarn using the swing of the reed. With the swing of the reed, the supply pipe deforms with elongation or buckling. The supply pipe generates a load corresponding to the magnitude of the deformation. In the preformed supply pipe, due to the swing of the air nozzle, elongation or buckling occurs with the shape having the bent portion as a reference. In other words, compared with the case where the supply pipe is straight when not installed on the air-jet loom, for example, the deformation generated at the supply pipe is small. In other words, the load generated at the supply pipe having the bent portion is reduced due to the preformed bent portion. Based on the above, by making the supply pipe of the air-jet loom have a preformed bent portion, the load generated at the supply pipe can be reduced.

[0011] Alternatively, the above air nozzle is a sub-nozzle that jets air to the weft yarn drawn to the inner passage of the reed provided on the above reed.

[0012] Accordingly, the supply pipe connects the electromagnetic on-off valve that controls the supply of air to the sub-nozzle to the sub-nozzle provided on the reed. In addition, the supply pipe buckles at the bent portion even when not connected to the electromagnetic on-off valve and the sub-nozzle. Compared with the supply pipe that connects the electromagnetic on-off valve to the main nozzle, for example, the supply pipe that connects the electromagnetic on-off valve to the sub-nozzle buckles more significantly when installed on the air-jet loom. In other words, by pre-setting the bent portion on the supply pipe that connects the electromagnetic on-off valve to the sub-nozzle, the air-jet loom can significantly reduce the load compared with setting the bent portion at the supply pipe connected to the main nozzle, for example.

[0013] Alternatively, in the above air-jet loom, the above supply pipe is preformed into a shape that connects the electromagnetic on-off valve to the above sub-nozzle supported by the above reed when the reed is at the center of the swing range.

[0014] The greater the deformation of the supply pipe relative to its shape when not connected to the electromagnetic on-off valve and the sub-nozzle, the greater the load generated at the supply pipe. Therefore, the smaller the deformation of the supply pipe, the smaller the load generated at the supply pipe. In particular, when the supply pipe pre-has the shape when the reed is at the center of the swing range, on the supply pipe that connects the electromagnetic on-off valve to the sub-nozzle, the deformation generated due to the swing of the reed is the smallest. In other words, due to the air-jet loom having the above structure, the load generated due to the swing of the reed on the supply pipe that connects the electromagnetic on-off valve to the sub-nozzle can be reduced.

[0015] Alternatively, in the above air-jet loom, the bent portion has: the 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 the 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.

[0016] Accordingly, the supply pipe deforms at each of the first turning portion and the second turning portion as the reed race moves. After the flow direction of the air introduced from the electromagnetic on-off valve into the supply pipe changes in the flow path defined by the first turning portion, it flows into the flow path defined by the second turning portion. And the air flowing 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 then is supplied to the sub-nozzle. For example, in the case of a supply pipe connecting the electromagnetic on-off valve and the sub-nozzle, if the supply pipe has only one portion that forms a bend extending from the electromagnetic on-off valve toward the sub-nozzle, the deformation of the supply pipe accompanying the swing of the reed race concentrates on this portion, which is not preferable. In other words, by respectively having the first turning portion and the second turning portion, the supply pipe can disperse the load formed accompanying the deformation generated in the supply pipe due to the swing of the reed race.

[0017] Alternatively, in the above air-jet loom, the bent portion is preformed into a shape that connects the electromagnetic on-off valve and the sub-nozzle, which are at different positions in the weft insertion direction.

[0018] Accordingly, even in the case where 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 formed on the supply pipe accompanying the swing of the reed race. For example, in the case where a plurality of sub-nozzles are connected to one electromagnetic on-off valve, the electromagnetic on-off valve and each sub-nozzle are not in the same position in the weft insertion direction. In other words, in the case where a plurality of sub-nozzles are connected to one electromagnetic on-off valve, the above structure can also reduce the load generated on the supply pipe accompanying the swing of the reed race.

[0019] Alternatively, in the above air-jet loom, the supply pipe is preformed into a shape having a central axis orthogonal to the weft insertion direction.

[0020] Accordingly, the supply pipe extends in a direction orthogonal to the weft insertion direction. A supply pipe with the above structure is easier to produce than, for example, a supply pipe that also extends in the weft insertion direction. In other words, by having a supply pipe with a central axis orthogonal to the weft insertion direction, the air-jet loom can reduce the load generated at the supply pipe during the swing of the reed race and improve the productivity of the supply pipe.

[0021] Alternatively, in the above air-jet loom, the air nozzle is a main nozzle that inserts the weft yarn into the passage within the reed provided at the reed.

[0022] Accordingly, the supply pipe connects the electromagnetic on-off valve that controls the supply of air to the main nozzle to the main nozzle provided on the reed. In other words, when the air nozzle swings, the main nozzle and the supply pipe swing together with the reed. According to the above structure, when the reed swings, deformation accompanied by elongation and buckling formation occurs in the supply pipe that connects the electromagnetic on-off valve to the main nozzle. Since the supply pipe has a preformed bent portion, the deformation of the supply pipe accompanying the swing of the reed can be made smaller compared to a case where, for example, the supply pipe connecting the electromagnetic on-off valve to the main nozzle does not have a bent portion. In other words, 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 that connects the electromagnetic on-off valve to the main nozzle along with the swing of the reed.

[0023] Alternatively, in the above air-jet loom, there may be a repeater provided on the reed and sandwiched between the electromagnetic on-off valve and the main nozzle. The supply pipe includes: a first connecting supply pipe that connects the electromagnetic on-off valve to the repeater; and a second connecting supply pipe that connects the repeater to the main nozzle. The bent portion is preformed in the first connecting supply pipe.

[0024] According to the above structure, between the main nozzle and the electromagnetic on-off valve, the first connecting supply pipe has a bent portion. In other words, compared to a case where, for example, 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.

[0025] According to the present invention, the load generated in the supply pipe can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram showing an air-jet loom.

[0027] Figure 2 It is a partial perspective view showing an air-jet loom.

[0028] Figure 3 It is a partial side view showing an air-jet loom.

[0029] Figure 4 It is a partial perspective view showing an air-jet loom.

[0030] Figure 5 It is a perspective view showing a sub-nozzle supply pipe.

[0031] Figure 6 It is a schematic diagram showing the first posture, the reference posture, and the second posture of the reed.

[0032] Figure 7 It is a partial perspective view showing another air-jet loom.

[0033] Explanation of reference numerals

[0034] 10...Base; 13...Sley; 15...Reed; 15b...Inner passage of reed; 21...First electromagnetic on-off valve as an electromagnetic on-off valve; 22...Second electromagnetic on-off 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. Detailed implementation mode

[0035] Hereinafter, according to Figures 1 to 6 An embodiment of embodying an air-jet loom will be described.

[0036] <Air-jet loom>

[0037] As Figure 1 , Figure 2 and Figure 3 shown, 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.

[0038] The air-jet loom 100 has a locking shaft 12, a sley 13, and a reed 15 provided on the sley 13. The air-jet loom 100 performs weft insertion by causing the weft yarn Y to travel along the weft insertion direction W by means of 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 a fabric C by beating the weft yarn Y being inserted with the reed 15. The fabric C is formed by the weft yarn Y and warp yarns T extending in the front-back direction F orthogonal to the weft insertion direction W. In the air-jet loom 100, the up-down direction U is a direction orthogonal to the weft insertion direction W and the front-back direction F respectively. Hereinafter, the traveling direction of the weft yarn Y traveling in the weft insertion direction W will be referred to as the "downstream" side, and the opposite side will be referred to as the "upstream" side. In other words, the weft yarn Y travels from the upstream side toward the downstream side in the weft insertion direction W. Further, in the front-back direction F, the direction in which the woven fabric C is wound will be referred to as the "front" side, and the direction opposite to the front side across the air-jet loom 100 will be referred to as the "rear" side.

[0039] <Base>

[0040] As Figure 1 and Figure 2As shown, the air tank 11 is in the shape of a long strip with its long side extending in the width direction of the air-jet loom 100. In other words, the air tank 11 extends in the weft insertion direction W. Each end of the air tank 11 in the long side direction is supported by the side frame 14. The air tank 11 is supported by a pair of side frames 14 that are separately provided in the width direction of the air-jet loom 100, and is installed on the pair of side frames 14. Moreover, the air tank 11 functions as a beam member of the loom frame that extends and is fixedly provided in the width direction of the air-jet loom 100.

[0041] The air tank 11 has a structure in which the hollow interior of the beam extending between the pair of side frames 14 is used 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 supply source (not shown), and the compressed air is stored in the tank chamber 11a.

[0042] <Locking shaft, reed carrier and reed>

[0043] As Figure 3 shown, the locking shaft 12 is cylindrical and extends in the width direction of the air-jet loom 100. In other words, the locking shaft 12 extends in the weft insertion direction W. The locking shaft 12 is installed on the pair of side frames 14. Both ends of the locking shaft 12 in the extending direction are supported by the pair of side frames 14 via bearings (not shown) so that the locking shaft 12 can rotate about its axis. The locking shaft 12 rotates relative to the pair of side frames 14 with the axis extending in the weft insertion direction W as the rotation axis.

[0044] An arm 12a that extends upward in the up-and-down direction U of the air-jet loom 100 is integrally provided on the locking shaft 12. The reed carrier 13 is supported by the upper end of the arm 12a. The reed carrier 13 extends in the width direction of the air-jet loom 100. In other words, the reed carrier 13 extends in the weft insertion direction W of the weft yarn Y. The reed carrier 13 rotates integrally with the locking shaft 12. When the locking shaft 12 rotates relative to the pair of side frames 14, the reed carrier 13 swings in the front-and-back direction F. The reed carrier 13 is located above the air tank 11 in the up-and-down direction U and behind the air tank 11 in the front-and-back direction F.

[0045] As Figure 1 and Figure 2 shown, the air-jet loom 100 is equipped with a reed 15. The reed 15 is supported by the reed carrier 13. The lower end of the reed 15 is fixed to the reed carrier 13. In other words, the reed carrier 13 supports the reed 15. The reed 15 is formed by a plurality of reed teeth 15a arranged in a row in the weft insertion direction W. In other words, the plurality of reed teeth 15a are arranged in the width direction of the air-jet loom 100. In addition, Figure 3 only one reed tooth 15a among the plurality of reed teeth 15a is shown.

[0046] As Figure 1 and Figure 2As shown, a plurality of reed teeth 15a are arranged at intervals in the weft insertion direction W on the reed base 13. Each reed tooth 15a is supported by the reed base 13 by fixing the lower end of each reed tooth 15a to the reed base 13. In other words, in the reed 15, a plurality of gaps are formed in the weft insertion direction W. The warp yarns T pass through these gaps.

[0047] 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. In other words, the passage 15b extends in the direction in which the reed teeth 15a are arranged. The passage 15b opens at both ends of the reed 15 in the direction in which the reed teeth 15a are arranged.

[0048] The reed 15 swings in the front - rear direction F together with the reed base 13 by the locking shaft 12. The reed 15 beats the weft yarn Y by swinging together with the reed base 13. In other words, the air jet loom 100 beats the weft yarn Y by swinging the reed 15 in the front - rear direction F. As Figure 6 shown, the reed base 13 swings in the 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. Figure 6 In, the reed 15 in the first posture P1 and the sub - nozzle S are indicated by a single - dotted line, and the reed 15 in the second posture P2 and the sub - nozzle S are indicated by a double - dotted line. The reed 15 swings along the circumferential direction of the locking shaft 12. When the reed 15 is in the second posture P2, the reed 15 contacts the cloth fell C1. The reed 15 beats the weft yarn Y when it becomes the second posture P2 along with the weft yarn Y passing through the passage 15b. The position of the reed base 13 when the reed 15 is in the first posture P1 is the most retracted position in the front - rear direction F within the swing range of the reed base 13 relative to the position where the reed 15 is in the second posture P2. In other words, the reed base 13 swings in the 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.

[0049] <Weft Insertion Device>

[0050] As Figure 1 shown, 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.

[0051] <Main Nozzle and First Electromagnetic On - Off Valve>

[0052] The main nozzle M is provided on the reed base 13. In other words, the reed base 13 supports the main nozzle M. Therefore, the main nozzle M swings in the front - rear direction F together with the reed base 13. The main nozzle M is provided on the most upstream side of the reed base 13 in the weft insertion direction W. More specifically, the main nozzle M is provided at a position on the reed base 13 upstream of the reed 15 in the weft insertion direction W.

[0053] The main nozzle M ejects the weft yarn Y into the passage 15b in the reed by ejecting air supplied from a pressure supply source (not shown). In other words, the main nozzle M guides the weft yarn Y to the passage 15b in the reed 15. The weft yarn Y ejected into the passage 15b in the reed travels along the weft insertion direction W in the passage 15b. In other words, the air-jet loom 100 guides the weft yarn Y to the passage 15b in 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 from the main nozzle M travels.

[0054] 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. Alternatively, the first electromagnetic on-off valve 21 may not 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 a main nozzle supply pipe 31. In other words, the air-jet loom 100 has a 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 pipe.

[0055] <Sub-nozzles and Second Electromagnetic On-Off Valve>

[0056] As Figure 2 shown, the air-jet loom 100 is provided with a plurality of sub-nozzles S. The sub-nozzles S are provided on the front side of the reed base 13. The reed base 13 supports the sub-nozzles S. The sub-nozzles S swing in the front-rear direction F together with the reed base 13. As Figure 6 shown, the sub-nozzles S are provided at positions where they do not contact the cloth fell C1 and the fabric C respectively when the reed 15 is in the second posture P2.

[0057] As Figure 3 shown, the sub-nozzle S has a supply port Sa at the first end and a jet port Sb at the second end. Air is supplied from the air tank 11 to the supply port Sa. The jet port Sb jets the air supplied to the supply port Sa. In other words, the sub-nozzle S jets the air supplied from the air tank 11 to the supply port Sa toward the passage 15b in the reed from the jet port Sb. In other words, the sub-nozzle S jets air to the weft yarn Y guided to the passage 15b in the reed. Therefore, in the present embodiment, the air nozzle is the sub-nozzle S that jets air to the weft yarn Y guided to the passage 15b in the reed. The jet direction of the air jetted from the sub-nozzle S is along the weft insertion direction W. The weft yarn Y is pulled by the air jetted from the sub-nozzle S and travels in the passage 15b in the reed.

[0058] As Figure 1As shown, a plurality of second electromagnetic on-off valves 22 are installed on the air tank 11. In other words, the second electromagnetic on-off valves 22 are provided on the base 10. The second electromagnetic on-off valves 22 are installed on the rear surface of the outer surface of the air tank 11. In other words, the second electromagnetic on-off valves 22 are located below the reed base 13 in the vertical direction U. In other words, the second electromagnetic on-off valves 22 are located below the sub-nozzle S. In addition, the second electromagnetic on-off valves 22 are located in front of the reed base 13 in the front-rear direction F. In other words, the second electromagnetic on-off valves 22 are located in front of the sub-nozzle S.

[0059] As Figure 1 and Figure 2 shown, the second electromagnetic on-off valve 22 has an inlet (not shown), a first outlet 22a, and a second outlet 22b. The first outlet 22a and the second outlet 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. In addition, the first outlet 22a and the second outlet 22b are each located below the sub-nozzle S. Air flows into the second electromagnetic on-off valve 22 from the air tank 11 via the inlet (not shown). The air flowing into the second electromagnetic on-off valve 22 flows out from the first outlet 22a and the second outlet 22b.

[0060] As Figure 2 and Figure 4 shown, in the second electromagnetic on-off valve 22, the first outlet 22a opens to the rear side in the front-rear direction F. In other words, the opening direction of the first outlet 22a is the front-rear direction F. In the second electromagnetic on-off valve 22, in a plane orthogonal to the vertical direction U, the second outlet 22b opens toward the downstream side in the weft insertion direction W relative to the first outlet 22a and opens to the rear side in the front-rear direction F. In other words, when viewed from the vertical direction U, the second outlet 22b opens in a direction different from that of the first outlet 22a.

[0061] The second electromagnetic on-off valve 22 can be switched between an excited state and a demagnetized state. The excited state is a state in which the inlet communicates with the first outlet 22a and the second outlet 22b respectively, and the demagnetized state is a state in which the inlet is disconnected from the first outlet 22a and the second outlet 22b respectively. The second electromagnetic on-off valve 22 is connected to a control device (not shown) and is switched between the excited state and the demagnetized state according to a signal from the control device. The control device can control each of the plurality of second electromagnetic on-off valves 22 individually. For example, the control device can make one of the plurality of second electromagnetic on-off valves 22 in the excited state and make the other second electromagnetic on-off valves 22 in the demagnetized state. In other words, the second electromagnetic on-off valve 22 controls the supply of air from the air tank 11 to the sub-nozzle S.

[0062] The second electromagnetic on-off valve 22 supplies air to the sub-nozzle S through the first outlet 22a and the second outlet 22b respectively. In other words, for one second electromagnetic on-off valve 22, two sub-nozzles S are connected. One of the two sub-nozzles S connected to the second electromagnetic on-off valve 22 is defined as the first sub-nozzle S1, and the other of the two sub-nozzles S is defined as the second sub-nozzle S2. The first sub-nozzle S1 is supplied with the air flowing out from the first outlet 22a. The second sub-nozzle S2 is supplied with the air flowing out from the second outlet 22b.

[0063] As Figure 4 shown, the first sub-nozzle S1 is located at a position slightly downstream of the second electromagnetic on-off valve 22 in the weft insertion direction W. The second sub-nozzle S2 is provided at a position downstream of the second electromagnetic on-off valve 22 and the first sub-nozzle S1 in the weft insertion direction W. In other words, the second sub-nozzle S2 is located at a position different from that of the second electromagnetic on-off valve 22 in the weft insertion direction W.

[0064] The distance between the sub-nozzle S and the second electromagnetic on-off valve 22, that is, the distances between the sub-nozzle S and the second electromagnetic on-off valve 22 in the front-back direction F and the up-down direction U respectively, change together with the swing of the reed seat 13. In other words, the distance between the sub-nozzle S and the second electromagnetic on-off valve 22 changes due to the swing of the sub-nozzle S. When the reed seat 13 is at the position where the reed 15 is in the first posture P1, the distance between the sub-nozzle S and the second electromagnetic on-off valve 22 in the front-back direction F is the largest. In addition, when the reed seat 13 is at the position where the reed 15 is in the second posture P2, the distance between the sub-nozzle S and the second electromagnetic on-off valve 22 in the front-back direction F is the smallest. During the process of the reed 15 changing from the first posture P1 to the second posture P2, at the position where the extending direction of the reed teeth 15a is aligned with the up-down direction U, the distance between the sub-nozzle S and the second electromagnetic on-off valve 22 in the up-down direction U is the largest.

[0065] As Figure 6 shown, in the circumferential direction of the locking shaft 12, the position that is the middle between the position of the reed seat 13 where the reed 15 is in the first posture P1 and the position of the reed seat 13 where the reed 15 is in the second posture P2 is the position of the reed seat 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 reed seat 13 is at the center of the swinging range. The angle formed by the extending direction of the reed teeth 15a in the first posture P1 and the extending direction of the reed teeth 15a in the reference posture PP is equal to the angle formed by the extending direction of the reed teeth 15a in the reference posture PP and the extending direction of the reed teeth 15a in the second posture P2. In other words, in the circumferential direction of the locking shaft 12, the reed 15 in the reference posture PP is separated from the reed 15 in the first posture P1 and the reed 15 in the second posture P2 by the same distance respectively.

[0066] <Sub-nozzle supply pipe>

[0067] The air-jet loom 100 has a sub-nozzle supply pipe 40. The sub-nozzle supply pipe 40 is a flexible and bendable 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, for example, by thermoforming.

[0068] The first pipe end portion 41 and the second pipe end portion 42 extend linearly respectively. The sub-nozzle supply pipe 40 has a first opening 41a that opens at the first pipe end portion 41. And, it has a second opening 42a that opens at the second pipe end portion 42. An internal flow path 40c that communicates the first opening 41a and the second opening 42a is formed inside the sub-nozzle supply pipe 40. The internal flow path 40c opens at the first opening 41a and the second opening 42a. Figure 5 The center axis L of the sub-nozzle supply pipe 40 is indicated by a single-dot chain line. The center axis L is also the axis of the internal flow path 40c.

[0069] The first opening 41a is connected to either the first outlet 22a or the second outlet 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 via 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 guides the air supplied from the first opening 41a to the sub-nozzle S from the second opening 42a via the internal flow path 40c. The air flowing into the sub-nozzle supply pipe 40 from the first opening 41a forms a flow in the internal flow path 40c and then reaches the second opening 42a.

[0070] The bent portion 43 is a part different from both the first pipe end portion 41 and the second pipe end portion 42 in the sub-nozzle supply pipe 40. The bent portion 43 is pre-formed on the sub-nozzle supply pipe 40. In other words, the sub-nozzle supply pipe 40 has a pre-formed bent portion 43.

[0071] 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 state where the first pipe end portion 41 is not connected to the second electromagnetic on-off valve 22 and the second pipe end portion 42 is not connected to the sub-nozzle S. In this state, no load is generated on the sub-nozzle supply pipe 40. When the sub-nozzle supply pipe 40 in this state is deformed by applying a load, it returns to the shape before being deformed by the load over time from the moment when the application of the load is stopped. The shape of the sub-nozzle supply pipe 40 where it is not connected to the second electromagnetic on-off valve 22 and the sub-nozzle S respectively is defined as the natural shape N. In other words, the sub-nozzle supply pipe 40 that has been deformed from the natural shape N becomes the natural shape N after being deformed in the direction of restoring the natural shape N.

[0072] When the sub-nozzle supply pipe 40 installed on the air-jet loom 100 is in the natural shape N, the sub-nozzle supply pipe 40 does not apply force to the second electromagnetic on-off valve 22 and the sub-nozzle S respectively. In other words, when the sub-nozzle supply pipe 40 is not in the natural shape N, the sub-nozzle supply pipe 40 applies force to the second electromagnetic on-off valve 22 and the sub-nozzle S respectively. Let the shape of the sub-nozzle supply pipe 40 in this case be the force-applying shape A. The sub-nozzle supply pipe 40 can be deformed from the natural shape N to the force-applying shape A due to the swing of the reed base 13.

[0073] The sub-nozzle supply pipe 40 has a shape that connects the second electromagnetic on-off valve 22 and the sub-nozzle S in a state where the reed 15 is in the reference posture PP as the natural shape N. In other words, the sub-nozzle supply pipe 40 is preformed into a shape that connects the second electromagnetic on-off valve 22 and the sub-nozzle S in a state where the reed 15 is in the reference posture PP. In other words, the sub-nozzle supply pipe 40 is preformed into a shape that connects the second electromagnetic on-off valve 22 and the sub-nozzle S supported by the reed base 13 at the center of the swing range of the reed base 13.

[0074] The bent portion 43 has a first turning portion 43a and a second turning portion 43b respectively. The first turning portion 43a is the portion of the bent portion 43 closer to the first pipe end portion 41 side. The second turning portion 43b is the portion of the bent portion 43 closer to the second pipe end portion 42 side. The first turning portion 43a and the second turning portion 43b each delimit a part of the internal flow path 40c. The first turning portion 43a and the second turning portion 43b each cause the delimited part of the internal flow path 40c to bend. The first turning portion 43a in the internal flow path 40c delimits the first turning flow path 43c. The second turning portion 43b in the internal flow path 40c delimits the second turning flow path 43d. Figure 5In this case, the first boundary B1 between the first tube end portion 41 and the first turning portion 43a, the second boundary B2 between the first turning portion 43a and the second turning portion 43b, and the third boundary B3 between the second turning portion 43b and the second tube end portion 42 are each indicated by a double-dashed line.

[0075] When viewed from the weft insertion direction W, the first turning flow path 43c changes the flow direction of the air flowing in from the second electromagnetic on-off valve 22 via the first opening portion 41a in the front-rear direction F. In other words, at the first turning portion 43a, the air flowing in 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 observed 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. In other words, when viewed from the weft insertion direction W, the flow direction of the air flowing in from the first opening portion 41a is changed from backward in the front-rear direction F to forward in the front-rear direction F due to the first turning portion 43a. Therefore, when viewed from the weft insertion direction W, 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. In other words, the first turning portion 43a changes the flow direction of the air flowing inside in a plane orthogonal to the weft insertion direction W.

[0076] When viewed from the weft insertion direction W, 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. More specifically, the air passing through the second turning flow path 43d changes the flow direction observed 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, when viewed from the weft insertion direction W, 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. In other words, the second turning portion 43b changes the flow direction of the air flowing inside in a plane orthogonal to the weft insertion direction W. The air whose flow direction has been changed due to the second turning portion 43b is introduced into the second opening portion 42a. In other words, the second turning portion 43b introduces the air that has passed through the first turning portion 43a into the sub-nozzle S. The first turning flow path 43c and the second turning flow path 43d respectively guide the air flowing in from the first opening portion 41a upward along the central axis L. In other words, the sub-nozzle supply pipe 40 connects the second electromagnetic on-off valve 22 and the sub-nozzle S at different positions in the up-down direction U.

[0077] Connected to the second electromagnetic on-off valve 22 are a first sub-nozzle supply pipe 401 connected to the first outlet 22a and a second sub-nozzle supply pipe 402 connected to the second outlet 22b. The first sub-nozzle supply pipe 401 allows air to flow into the first outlet 22a through the first opening 41a and supplies air to the supply port Sa of the first sub-nozzle S1 through the second opening 42a. In other words, the second electromagnetic on-off valve 22 supplies air to the first sub-nozzle S1 via the first sub-nozzle supply pipe 401. The second sub-nozzle supply pipe 402 allows air to flow into the second outlet 22b through the first opening 41a and supplies air to the supply port Sa of the second sub-nozzle S2 through the second opening 42a. In other words, the second electromagnetic on-off valve 22 supplies air to the second sub-nozzle S2 via the second sub-nozzle supply pipe 402.

[0078] As Figure 4 shown, the second electromagnetic on-off valve 22 is located slightly upstream of the first sub-nozzle S1 in the weft insertion direction W. When the second electromagnetic on-off valve 22 is in the same position as the first sub-nozzle S1 in the weft insertion direction W, the first sub-nozzle supply pipe 401 has a two-dimensional shape in a plane orthogonal to the weft insertion direction W. In addition, when the second electromagnetic on-off valve 22 is slightly downstream of the first sub-nozzle S1 in the weft insertion direction W, the shape of the first sub-nozzle supply pipe 401 is also included in the two-dimensional shape.

[0079] The first sub-nozzle supply pipe 401 connects the first outlet 22a to the supply port Sa of the first sub-nozzle S1. The first sub-nozzle S1 is located slightly downstream of the first outlet 22a in the weft insertion direction W. 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 makes it flow upward in the up-down direction U. The first sub-nozzle supply pipe 401 has this pre-formed bent portion 43.

[0080] In the internal flow path 40c of the first sub-nozzle supply pipe 401, air hardly flows in the weft insertion direction W. In this case, the first sub-nozzle supply pipe 401 is pre-formed into a shape having a central axis L orthogonal to the weft insertion direction W. Even when the first sub-nozzle S1 is located slightly downstream of the second electromagnetic on-off valve 22 in the weft insertion direction W, the first sub-nozzle supply pipe 401 can connect the second electromagnetic on-off valve 22 and the first sub-nozzle S1 with almost no deformation.

[0081] The second electromagnetic on-off valve 22 is located upstream of the second sub-nozzle S2 in the weft insertion direction W. In other words, the second sub-nozzle supply pipe 402 connects the second outlet 22b, which is at a different position in the weft insertion direction W, to the supply port Sa of the second sub-nozzle S2. Therefore, the second sub-nozzle supply pipe 402 has a bent portion 43 in its natural shape N that causes the air supplied from the second electromagnetic on-off valve 22 to change its flow direction in the front-rear direction F, flow upward in the up-down direction U, and flow downstream in the weft insertion direction W. In other words, the second sub-nozzle supply pipe 402 has a bent portion 43 that is pre-formed into a shape that allows the second sub-nozzle supply pipe 402 to connect the second electromagnetic on-off valve 22, which is at a different position in the weft insertion direction W, to the sub-nozzle S.

[0082] <Weaving performed by the air-jet loom 100>

[0083] As Figure 1 shown, during the operation of the air-jet loom 100, the weft yarn Y is ejected from the main nozzle M and travels in the weft insertion direction W in the reed passage 15b. 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 between the warp yarns T. The relay injection is performed by switching between the excited state and the demagnetized state of a 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.

[0084] The weft yarn Y weft-inserted by the weft insertion device 20 is beaten at the cloth fell C1 by the reed 15 that swings together with the reed base 13. When the reed base 13 swings, the sub-nozzles S also swing together with the reed base 13. In other words, in the front-rear direction F, the distance between the sub-nozzle S and the second electromagnetic on-off valve 22 changes. This causes the sub-nozzle supply pipe 40 to deform relative to the natural shape N. The air-jet loom 100 weaves the fabric C by this beating.

[0085] [Function of the present embodiment]

[0086] The function of the present embodiment will be described.

[0087] When the sub-nozzle S swings, the sub-nozzle supply pipe 40, which is pre-formed with the bent portion 43, deforms based on the shape of the bent portion 43. In other words, the deformation generated in the sub-nozzle supply pipe 40 due to the swing of the sub-nozzle S occurs as a change amount formed from the pre-formed bent portion 43. In other words, a load corresponding to the change amount from the bent portion 43 is generated in the sub-nozzle supply pipe 40 due to the swing of the sub-nozzle S.

[0088] [Effects of the present embodiment]

[0089] The effects of the present embodiment will be described.

[0090] (1) The sub-nozzle supply pipe 40 has a bent portion 43 that is pre-formed even when not installed in the air-jet loom 100. By providing the bent portion 43 in the sub-nozzle supply pipe 40 in advance, the air-jet loom 100 can reduce the load generated on the sub-nozzle supply pipe 40 when installing the sub-nozzle supply pipe 40 on the sub-nozzle S and the second electromagnetic on-off valve 22.

[0091] In addition, the sub-nozzle supply pipe 40 having the pre-formed bent portion 43 deforms with the shape having the bent portion 43 as a reference due to the swing of the sub-nozzle S. In other words, compared with the case where the sub-nozzle supply pipe 40 is linear when not installed in the air-jet loom 100, for example, the deformation generated on the sub-nozzle supply pipe 40 is small. In other words, the load generated on the sub-nozzle supply pipe 40 having the bent portion 43 is reduced due to the pre-formed bent portion 43. Based on the above, the air-jet loom 100 can reduce the load generated on the sub-nozzle supply pipe 40 by making the sub-nozzle supply pipe 40 have a pre-formed bent portion 43.

[0092] (2) 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 arranged together with the swing of the reed base 13. In other words, the sub-nozzle supply pipe 40 deforms in the direction in which the reed base 13 swings. On the sub-nozzle supply pipe 40, the direction in which the bent portion 43 is pre-buckled is the same as the direction of the deformation generated on the sub-nozzle supply pipe 40 due to the swing of the sub-nozzle S. As a result, compared with the case where the bent portion 43 is formed in a direction different from the direction of deformation due to the swing of the sub-nozzle S, for example, the deformation of the bent portion 43 due to the swing of the sub-nozzle S is smaller. As a result, the sub-nozzle supply pipe 40 can reduce the load generated at the bent portion 43 by having the pre-formed bent portion 43.

[0093] (3) The greater the deformation relative to the natural shape N, the greater the load generated at the sub-nozzle supply pipe 40. Therefore, the smaller the deformation of the sub-nozzle supply pipe 40, the smaller the load generated at the sub-nozzle supply pipe 40. When the shape of the reed base 13 at the center of the swing range is the natural shape N, the deformation generated at the sub-nozzle supply pipe 40 due to the swing of the sub-nozzle S is the smallest. In other words, the air-jet loom 100 can reduce the load generated on the sub-nozzle supply pipe 40 due to the swing of the reed base 13 by pre-forming the natural shape N on the sub-nozzle supply pipe 40.

[0094] (4) The sub-nozzle supply pipe 40 is provided with a first turning portion 43a and a second turning portion 43b respectively. Thus, compared with a case where only one of the first turning portion 43a and the second turning portion 43b is provided, for example, it is possible to disperse the load acting on the bending portion 43 that accompanies the deformation generated on the bending portion 43. As a result, by providing the sub-nozzle supply pipe 40 with the first turning portion 43a and the second turning portion 43b, the air-jet loom 100 can reduce the load formed accompanying the deformation generated in the bending portion 43 when the sub-nozzle S swings.

[0095] (5) The second sub-nozzle supply pipe 402 is preformed into a shape that connects the second electromagnetic on-off valve 22 at different positions in the weft insertion direction W to the sub-nozzle S. In other words, even in a case where 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 generated at the second sub-nozzle supply pipe 402 that connects the second electromagnetic on-off valve 22 to each sub-nozzle S.

[0096] (6) The first sub-nozzle supply pipe 401 has a central axis L orthogonal to the weft insertion direction W in its natural shape N. Compared with, for example, a pipe formed to be pre-buckled also in the weft insertion direction W, the first sub-nozzle supply pipe 401 is easier to produce. In other words, by providing the air-jet loom 100 with the first sub-nozzle supply pipe 401 having a central axis L orthogonal to the weft insertion direction W, the load generated at the sub-nozzle supply pipe 40 during the swing of the reed base 13 can be reduced, and the productivity of the sub-nozzle supply pipe 40 can be improved.

[0097] (7) Compared with, for example, the main nozzle supply pipe 31, the sub-nozzle supply pipe 40 is greatly buckled in the state provided in the air-jet loom 100. In other words, compared with, for example, providing a bending portion 43 on the main nozzle supply pipe 31, by providing the bending portion 43 in advance on the sub-nozzle supply pipe 40, the air-jet loom 100 can greatly reduce the load applied to the air-jet loom 100.

[0098] [Modification Example]

[0099] In addition, 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 within a range where there is no technical contradiction.

[0100] ○ The air-jet loom 100 may also be provided with only one sub-nozzle supply pipe 40 that connects the sub-nozzle S to 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 the same-shaped bending portion 43 in the natural shape N.

[0101] ○Alternatively, the air-jet loom 100 may connect the second outlet 22b to the second sub-nozzle S2 through the first sub-nozzle supply pipe 401. In this case, two first sub-nozzle supply pipes 401 are installed on the second electromagnetic on-off valve 22.

[0102] ○Alternatively, the air-jet loom 100 may connect the first outlet 22a to the first sub-nozzle S1 through the second sub-nozzle supply pipe 402. In this case, two second sub-nozzle supply pipes 402 are installed on the second electromagnetic on-off valve 22.

[0103] ○Alternatively, the first turning portion 43a may change the flow direction of the air flowing inside in the weft insertion direction W. In addition, 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 in such a way that the load generated at the sub-nozzle supply pipe 40 can be reduced.

[0104] ○Alternatively, the sub-nozzle supply pipe 40 may not have the first turning portion 43a and the second turning portion 43b at the bending portion 43 respectively. For example, the sub-nozzle supply pipe 40 may have a portion that buckles from the second electromagnetic on-off valve 22 toward the sub-nozzle S. In addition, the sub-nozzle supply pipe 40 may have three or more turning portions at the bending portion 43 in such a way as to connect the second electromagnetic on-off valve 22 to the sub-nozzle S.

[0105] ○Alternatively, the sub-nozzle supply pipe 40 may not be preformed in a shape that connects the second electromagnetic on-off valve 22 to the sub-nozzle S supported by the reed base 13 at the center of the range where the reed base 13 swings. For example, the sub-nozzle supply pipe 40 may be preformed as the natural shape N in the state where the reed 15 is in either the first posture P1 or the second posture P2.

[0106] ○Alternatively, the natural shape N of the sub-nozzle supply pipe 40 may not be a shape that the sub-nozzle supply pipe 40 can present during the swing of the reed base 13. In other words, the bending portion 43 preformed on the sub-nozzle supply pipe 40 may not be a shape realized during the swing of the reed base 13.

[0107] ○Alternatively, the bending portion 43 may be preformed on the main nozzle supply pipe 31. In other words, the main nozzle supply pipe 31 has a preformed bending portion 43. In other words, the air nozzle of the air-jet loom 100 may be the main nozzle M that inserts the weft yarn Y into the reed inner passage 15b provided in the reed 15.

[0108] The main nozzle M is provided on the reed base 13. In other words, the main nozzle M swings together with the reed base 13 when the reed base 13 swings. When the reed base 13 swings, the main nozzle supply pipe 31 deforms along with elongation or buckling in the front-rear direction F. The greater the deformation of the main nozzle supply pipe 31, the greater the load generated at the main nozzle supply pipe 31. The main nozzle supply pipe 31 has a bent portion 43 that is pre-bent and formed. Thus, compared with a situation where, for example, the main nozzle supply pipe 31 does not have the bent portion 43, the deformation of the main nozzle supply pipe 31 associated with the swing of the reed base 13 can be made smaller. In other words, the bent portion 43 can reduce the load generated at the main nozzle supply pipe 31. As a result, the air-jet loom 100 can reduce the load generated at the main nozzle supply pipe 31 along with the swing of the reed base 13.

[0109] ○Alternatively, the air-jet loom 100 may interpose a repeater D between the main nozzle M and the first electromagnetic on-off valve 21. In this case, as Figure 7 shown, the air-jet loom 100 has a repeater D interposed between the first electromagnetic on-off valve 21 and the main nozzle M. The repeater D is provided on the reed base 13.

[0110] 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 that connects the first electromagnetic on-off valve 21 and the repeater D and a second connection supply pipe 312 that connects the repeater D and the main nozzle M. The first electromagnetic on-off valve 21 is provided in either one of the pair of side frames 14. Alternatively, in addition, the first electromagnetic on-off valve 21 is not provided in the pair of side frames 14. In short, the first electromagnetic on-off valve 21 may be provided on the base 10.

[0111] The first connection supply pipe 311 has a pre-formed bent portion 43. A shape that buckles in the case of connecting the first electromagnetic on-off valve 21 and the repeater D is pre-formed on the first connection supply pipe 311. In this case, compared with the case of pre-forming the entire main nozzle supply pipe 31, the pre-formed portion is shorter. In other words, by pre-forming the bent portion 43 at the first connection supply pipe 311 in the main nozzle supply pipe 31, the production cost of the main nozzle supply pipe 31 can be reduced.

[0112] In addition, in this case, the repeater D is provided on the reed base 13. In other words, the portion that deforms together with the swing of the reed base 13 is limited to the first connection supply pipe 311 in 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 using the repeater D, the air-jet loom 100 can reduce the production cost of the main nozzle supply pipe 31 and can reduce the load generated at the main nozzle supply pipe 31 due to the swing of the main nozzle M.

[0113] ○Alternatively, the bent portions 43 may be pre-formed in the main nozzle supply pipe 31 and the sub-nozzle supply pipe 40 respectively. Or, alternatively, the bent portion 43 may be pre-formed in the main nozzle supply pipe 31 and not pre-formed in the sub-nozzle supply pipe 40.

[0114] ○Alternatively, the air nozzle may not be the main nozzle M and the sub-nozzle S. For example, the air nozzle may be a stretching nozzle supported by the reed base 13, a pneumatic nail gun. In other words, the supply pipe pre-formed with the bent portion 43 is not limited to the main nozzle supply pipe 31 and the sub-nozzle supply pipe 40. In short, it is sufficient that the supply pipe connects the air nozzle supported by the reed base 13 to the electromagnetic on-off valve supported by the base 10. For example, when the stretching nozzle and the electromagnetic on-off valve are connected by a supply pipe, the bent portion 43 of the supply pipe is pre-formed in a shape in which the supply pipe connects the stretching nozzle and the electromagnetic on-off valve. According to the above, as long as the air nozzle connected to the supply pipe with the pre-formed bent portion is an air nozzle supported by the reed base 13, it may also be a nozzle other than the main nozzle M and the sub-nozzle S, such as a stretching nozzle or a pneumatic nail gun.

[0115] [Supplementary Note]

[0116] The following describes the technical idea that can be grasped based on the above-described embodiments and modification examples.

[0117] (1) A jet loom having: a reed base that supports a reed and extends in the weft insertion direction of the weft yarn; an air nozzle supported by the reed base; an electromagnetic on-off valve supported by a base; and a supply pipe that connects the air nozzle to the electromagnetic on-off valve, wherein the reed performs beating-up of the weft yarn by swinging together with the reed base, and the jet loom is characterized in that the supply pipe has a bent portion that is bent in a natural shape without applying force to the electromagnetic on-off valve and the air nozzle respectively, and the bent portion can be deformed into a force-applying shape that applies force to the electromagnetic on-off valve and the air nozzle respectively due to the swing of the reed base.

Claims

1. An air jet loom having: A sley supporting the reed and extending in a 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 connecting the air nozzle and the electromagnetic on-off valve, The reed beats up the weft yarn by swinging together with the sley. The air jet loom is characterized in that: The supply tube has a preformed bend.

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

3. The air jet loom according to claim 2, characterized in that: The supply pipe is formed in advance into a shape that connects the electromagnetic on-off valve and the sub-nozzle supported by the sley when the sley is located at the center of the swing range.

4. The air jet loom according to claim 2 or 3, characterized in that: The bent portion has: a first deflection portion that changes the flow direction of the air flowing in from the electromagnetic opening and closing valve within a plane orthogonal to the weft insertion direction; as well as The second turning portion changes the flow direction of the air having passed through the first turning portion within a plane perpendicular to the weft insertion direction.

5. The air jet loom according to claim 2 or 3, characterized in that: The bent portion is formed in advance into a shape in which the supply pipe connects the electromagnetic on-off valve and the sub-nozzle at different positions in the weft insertion direction.

6. The air jet loom according to claim 2 or 3, characterized in that: The supply pipe is pre-formed into a shape having a central axis orthogonal to the weft insertion direction.

7. The air jet loom according to claim 1, characterized in that: The air nozzle is a main nozzle for inserting the weft yarn into a reed inner passage provided in the reed.

8. The air jet loom according to claim 7, characterized in that: A relay is provided between the electromagnetic opening and closing valve and the main nozzle and is 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 connecting supply pipe connecting the relay to the main nozzle, The bent portion is pre-formed on the first connection supply pipe.

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