Weft insertion device of air jet loom

Abstract

The invention provides a weft insertion device of an air jet loom, which can restrain air from being discharged to an opening part side of a weft yarn running path and can stably insert weft yarns to the weft yarn running path. A weft insertion nozzle (20) of an air jet loom (1) is provided with: a main nozzle (22); and a guide nozzle (60) which is arranged in parallel with the main nozzle (22) and injects air towards an inlet (41a) of the weft yarn path (41). The guide nozzle air injection starting time when the guide nozzle (60) starts to inject the air is before the main nozzle air injection starting time when the main nozzle (22) starts to inject the air, so that the air can be prevented from being discharged to the opening part side of the weft yarn running path (41), and the weft yarn (11) can be stably inserted into the weft yarn running path (41).

Description

[0001] This application is a divisional application of the application with application number 2021 1 1158 409.2, application date September 28, 2021, and invention name “Weft insertion device for air jet loom” Technical Field

[0002] The invention relates to a weft insertion device of an air jet loom. Background Art

[0003] As a weft insertion device of an air jet loom that ejects a weft yarn by ejecting compressed air (air) from a weft insertion nozzle, there is known a weft insertion device of an air jet loom such as that described in Patent Document 1. The weft insertion device described in Patent Document 1 has a structure for preventing the weft yarn from flying out of the weft yarn running path due to the discharge of air toward the opening side of the weft yarn running path of the profiled reed. In this structure, the inclination angle of the guide hole wall surface of the reed tooth forming the weft yarn running path, which is arranged in a section close to the main nozzle, is formed to be smaller than the inclination angle of the guide hole wall surface arranged in a section close to the opposite side of the main nozzle.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 5-86544

[0005] However, even if the guide hole wall of the reed tooth is formed with an inclined angle like the weft insertion device of the air jet loom described in Patent Document 1, it is impossible to completely prevent the air from being discharged to the opening side of the weft yarn running path. Therefore, it is known from experiments that, especially when using a weft yarn with high rigidity such as a filament, it is impossible to prevent the weft yarn from flying out of the weft yarn running path. Summary of the invention

[0006] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a weft insertion device for an air jet loom which can suppress the discharge of air toward the opening side of a weft yarn running path and stably insert the weft yarn into the weft yarn running path.

[0007] The weft insertion device of the air jet loom according to the present invention comprises: a profiled reed having a weft yarn running path; a main nozzle for ejecting the weft yarn toward the weft yarn running path by ejecting air toward the inlet of the weft yarn running path; and a guide nozzle arranged in parallel with the main nozzle for ejecting air toward the inlet of the weft yarn running path. The guide nozzle starts ejecting air before the main nozzle starts ejecting air.

[0008] In addition, the diameter of the outlet of the pilot nozzle may be smaller than the diameter of the outlet of the main nozzle.

[0009] Furthermore, the guide nozzle may be provided on the front side of the air jet loom relative to the main nozzle, and the jetting direction of the air may form an acute angle with respect to the longitudinal direction of the weft yarn running path.

[0010] In addition, the pressure value of the air ejected from the pilot nozzle may be equal to or higher than the pressure value of the air ejected from the main nozzle.

[0011] Furthermore, the air tank may include: a main air tank storing air ejected from the main nozzle; and a pilot nozzle air tank provided separately from the main air tank and storing air ejected from the pilot nozzle.

[0012] Furthermore, the timing at which the pilot nozzle ends the injection of air may be before the timing at which the main nozzle ends the injection of air.

[0013] According to the present invention, the weft insertion device of the jet loom includes a guide nozzle which is arranged in parallel with the main nozzle and sprays air toward the inlet of the weft yarn running path, and the time when the guide nozzle starts to spray air is before the time when the main nozzle starts to spray air. Therefore, the discharge of air to the opening side of the weft yarn running path can be suppressed, and the weft yarn can be stably inserted into the weft yarn running path. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the air jet loom according to the first embodiment.

[0015] Figure 2 yes Figure 1 A schematic diagram of the main nozzle and pilot nozzle is shown.

[0016] Figure 3 yes Figure 2 A top view of the first main nozzle acceleration tube, the second main nozzle acceleration tube and the guide nozzle acceleration tube is shown.

[0017] Figure 4 yes Figure 3 A schematic side view of the first main nozzle acceleration tube, the second main nozzle acceleration tube and the guide nozzle acceleration tube is shown.

[0018] Figure 5 is from Figure 2 The timing diagram of the main nozzle and pilot nozzle spraying air is shown.

[0019] Figure 6 This is a schematic diagram showing the flow velocity distribution of air in the weft yarn path of a conventional air jet loom.

[0020] Figure 7 This is a schematic diagram showing the flow velocity distribution of air in the weft yarn traveling path of the air jet loom according to the first embodiment.

[0021] Figure 8 This is a graph showing the relationship between the angle between the longitudinal direction of the weft yarn path and the air jet direction of the guide nozzle, the weft yarn flying frequency during weft insertion, and the difference in the weft yarn arrival time to the RH feeler.

[0022] Fig. 9 It is a side schematic diagram of the first main nozzle acceleration tube, the second main nozzle acceleration tube, and the guide nozzle acceleration tube of the first example of the second embodiment.

[0023] Fig.10 This is a side schematic view of the first main nozzle acceleration tube, the second main nozzle acceleration tube, and the guide nozzle acceleration tube of the second example of embodiment 2.

[0024] Fig.11 This is a schematic side view of the first main nozzle acceleration tube, the second main nozzle acceleration tube, and the guide nozzle acceleration tube of the third example of the second embodiment.

[0025] Fig.12 This is a schematic diagram of a main nozzle and a pilot nozzle according to the third embodiment.

[0026] Fig.13 yes Fig.12 A schematic side view of the 1st to 6th main nozzle acceleration tubes and the pilot nozzle acceleration tubes is shown.

[0027] Fig.14 It is a side schematic diagram of the first to sixth main nozzle acceleration tubes and the pilot nozzle acceleration tube of the first example of the fourth embodiment.

[0028] Fig.15 It is a side schematic diagram of the first to sixth main nozzle acceleration tubes and the pilot nozzle acceleration tube of the second example of the fourth embodiment.

[0029] Fig.16 It is a side schematic view of the first to sixth main nozzle acceleration tubes and the pilot nozzle acceleration tube of the third example of the fourth embodiment.

[0030] Fig.17 It is a top view of the main nozzle and the pilot nozzle involved in Embodiment 5.

[0031] Fig.18 It is a top view of the guide nozzle involved in Embodiment 6.

[0032] Fig.19 yes Fig.18 A schematic side view of the first main nozzle acceleration tube, the second main nozzle acceleration tube, the first pilot nozzle outlet and the second pilot nozzle outlet is shown.

[0033] Fig. 20 It is a schematic diagram of a guide nozzle of an air jet loom according to a seventh embodiment.

[0034] Description of Reference Numerals

[0035] 11...weft yarn; 22...main nozzle; 29...main air tank; 40...profile reed; 41...weft yarn path; 41a...inlet; 60, 60a, 66...guide nozzle; 63...guide nozzle air tank; A...angle; C...angle; M1...main nozzle air injection start time; M2...main nozzle air injection end time; N1...guide nozzle air injection start time; N2...guide nozzle air injection end time; ...diameter of the outlet; ...diameter of the outlet; ...the diameter of the outlet. DETAILED DESCRIPTION

[0036] Implementation method 1.

[0037] Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

[0038] Figure 1 1 is a schematic diagram of an air jet loom according to Embodiment 1. The air jet loom 1 is provided with a yarn feeding device 10 for supplying a weft yarn 11. The weft yarn 11 is drawn out by the rotation of a winding arm (not shown) and is wound around a storage drum 12 and stored. A weft yarn clamping pin 13 for unwinding the weft yarn 11 from the storage drum 12 or clamping the weft yarn 11 and a balloon sensor 14 for detecting that the weft yarn 11 is unwound from the storage drum 12 are provided near the storage drum 12. The yarn feeding device 10, the storage drum 12, the weft yarn clamping pin 13, and the balloon sensor 14 are fixed to a frame (not shown) of the air jet loom 1. In addition, the weft yarn clamping pin 13 and the balloon sensor 14 are connected to a main control device 50 for controlling the overall operation of the air jet loom 1. The main control device 50 controls the weft yarn clamping pin 13 to put the weft yarn 11 into an unwound state or a clamped state. In addition, the detection result of the balloon sensor 14 is input to the main control device 50.

[0039] In addition, a weft insertion nozzle 20 is provided in the air jet loom 1. The weft insertion nozzle 20 includes: a double nozzle 21, which draws out the weft yarn 11 of the storage drum 12 by ejecting compressed air (air) toward the inlet 41a of the weft insertion path, i.e., the weft yarn running path 41 described later; and a main nozzle 22, which is used to eject the weft yarn 11 from the outlet to the weft yarn running path 41 and run the yarn. In addition, the weft insertion nozzle 20 includes: a guide nozzle 60 arranged in parallel with the main nozzle 22. A brake 23 for braking the running of the weft yarn 11 is provided on the double nozzle 21. The brake 23 is a well-known braking device such as a mechanical brake or an air brake. The double nozzle 21 and the brake 23 are fixed to a frame (not shown) of the air jet loom 1. In addition, the brake 23 is connected to the main control device 50 and is controlled by the main control device 50. In addition, the weft insertion nozzle 20 constitutes a weft insertion device.

[0040] The double nozzle 21 is connected to the double valve 26 via a hose 24. The main nozzle 22 is connected to the main valve 27 via a hose 25. The double valve 26 and the main valve 27 are connected to the main air tank 29 via a hose 28. The main air tank 29 stores air supplied from an air supply system (not shown) of a weaving factory in which the air jet loom 1 is installed. The air stored in the main air tank 29 is ejected from the double nozzle 21 and the main nozzle 22. In addition, the double valve 26 and the main valve 27 are connected to and controlled by the main control device 50. In addition, the main air tank 29 constitutes a weft insertion device.

[0041] The elongated guide nozzle 60 guides the weft yarn 11 sent out from the main nozzle 22 to the weft yarn running path 41 by jetting air. In addition, unlike the main nozzle 22 and the double nozzle 21, the guide nozzle 60 does not have the weft yarn 11 passing therethrough. In addition, the guide nozzle 60 is connected to the guide nozzle valve 62 via a hose 61. The guide nozzle valve 62 is connected to the guide nozzle air tank 63 via a hose 69. The guide nozzle air tank 63 stores air supplied from the air supply system of the weaving factory in which the air jet loom 1 is installed. The air stored in the guide nozzle air tank 63 is ejected from the guide nozzle 60. In addition, the guide nozzle valve 62 is connected to the main control device 50 and controlled. In addition, the guide nozzle air tank 63 constitutes a weft insertion device.

[0042] The main nozzle 22, the guide nozzle 60, the profile reed 40, and the sub-nozzle 35 are arranged on a sley (not shown) described later, and reciprocate in the front-rear direction of the air jet loom 1. The profile reed 40 has a weft yarn running path 41 for the weft yarn 11 to run. The weft yarn running path 41 is arranged throughout the entire length direction of the profile reed 40. That is, the weft yarn running path 41 is arranged from Figure 1 The sub-nozzle 35 is arranged from the upstream side of the left end to the downstream side of the right end of the special-shaped reed 40. A plurality of sub-nozzles 35 are arranged along the weft yarn running path 41, and the weft yarn 11 is transported along the weft yarn running path 41 from the main nozzle 22 side, that is, the upstream side of the left end, by injecting air. That is, the weft yarn running path 41 is the conveying path of the weft yarn 11. In addition, the sub-nozzle 35 is connected to the sub-valve 33 via the hose 34. The sub-valves 33 are respectively connected to the sub-air tanks 32. The sub-air tanks 32 store air supplied from the air supply system of the weaving factory where the jet loom 1 is installed. The air stored in the sub-air tank 32 is ejected from the sub-nozzle 35. In addition, the sub-valves 33 are respectively connected to the main control device 50, and the opening and closing of the sub-valve 33 is controlled by the main control device 50.

[0043] The RH feeler 36 for detecting the running state of the weft yarn is provided on the right end side of the profile reed 40. The RH feeler 36 is connected to the main control device 50. The main control device 50 is connected to the function panel 51. The function panel 51 is a touch panel that displays the state of the air jet loom 1 and is used by the user to operate the air jet loom 1.

[0044] Figure 2 2 is a schematic diagram of the main nozzle 22 and the guide nozzle 60. The main nozzle 22 is a two-color main nozzle that delivers two-color weft yarns, and has a main nozzle base 22a, a first main nozzle acceleration tube 70 and a second main nozzle acceleration tube 71 corresponding to the colors of the weft yarns. The first main nozzle acceleration tube 70 and the second main nozzle acceleration tube 71 are provided at the main nozzle base 22a. The guide nozzle 60 is provided at the main nozzle base 22a, and has: a slender guide nozzle acceleration tube 64 extending in parallel with the first main nozzle acceleration tube 70 and the second main nozzle acceleration tube 71. The main nozzle supply port 80 formed on the side of the main nozzle base 22a is connected to the main nozzle via a hose 25 (see Figure 1 ) is connected to the main valve 27, and the pilot nozzle supply port 65 formed on the side of the main nozzle base 22a is connected to the main valve 27 via a hose 61 (see Figure 1 ) and connected to the pilot nozzle valve 62. In addition, Figure 2 In the figure, for convenience of description, description of the hose 25 and the hose 61 is omitted.

[0045] Air is supplied to the main nozzle 22 from the main nozzle supply port 80, and air is supplied to the pilot nozzle 60 from the pilot nozzle supply port 65. The main nozzle base 22a is attached to the sley 42 via the main nozzle support member 82. In addition, the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, and the pilot nozzle acceleration tube 64 are supported by the acceleration tube support member 81. The acceleration tube support member 81 is attached to the main nozzle support member 82.

[0046] Figure 3 It is a top view of the outlets of the first main nozzle accelerator tube 70, the second main nozzle accelerator tube 71 and the guide nozzle accelerator tube 64. The first main nozzle accelerator tube 70 is arranged in a direction substantially the same as the length direction of the weft yarn running path 41 of the profiled reed 40. The second main nozzle accelerator tube 71 is arranged on the front side (Y direction) of the profiled reed 40 relative to the first main nozzle accelerator tube 70, and is arranged to contact the first main nozzle accelerator tube 70 on the side close to the weft yarn running path 41 and form an acute angle with the first main nozzle accelerator tube 70. In addition, the guide nozzle accelerator tube 64 (guide nozzle 60) is arranged on the front side (Y direction) of the profiled reed 40 relative to the second main nozzle accelerator tube 71, and contacts the second main nozzle accelerator tube 71 on the side close to the weft yarn running path 41. In addition, the front side of the profiled reed 40 here refers to the air jet loom 1 (refer to Figure 1) is on the front side in the horizontal direction of the weft yarn running path 41, and on the opening side (open side) of the weft yarn running path 41. The first main nozzle accelerator tube 70 (main nozzle 22) and the guide nozzle accelerator tube 64 (guide nozzle 60) are configured so that the extension direction of the first main nozzle accelerator tube 70, i.e., the length direction of the weft yarn running path 41, forms an acute angle with the guide nozzle accelerator tube 64. In addition, it is preferred that the angle A is in the range of 5 to 25 degrees. Angle A may also be an obtuse angle, but this causes the point where the jets converge to be too close to the main nozzle 22, thereby reducing the effect of the guide nozzle 60, and thus an acute angle is preferred. In the case where angle A is an acute angle, it may also be outside the range of 5 to 25 degrees, but if Figure 8 As shown, in order to suppress the inconsistency in the weft flying frequency and the weft arrival time, the range of 5 to 25 degrees is more preferable.

[0047] Figure 4 This is a side view schematic diagram of the outlets of the first main nozzle accelerator tube 70, the second main nozzle accelerator tube 71, and the guide nozzle accelerator tube 64 when viewed from the side of the profile reed 40. The second main nozzle accelerator tube 71 is arranged on the side farther from the front side (Y direction) of the weft yarn running path 41, that is, the deep wall side of the weft yarn running path 41, i.e., the outer side, relative to the first main nozzle accelerator tube 70. The guide nozzle accelerator tube 64 is arranged on the front side of the second main nozzle accelerator tube 71. That is, the first main nozzle accelerator tube 70, the second main nozzle accelerator tube 71, and the guide nozzle accelerator tube 64 are arranged in sequence in a straight line from the deep wall side, i.e., the inner side, of the weft yarn running path 41.

[0048] Refer again Figure 3 The length direction of the weft yarn path 41 and the guide nozzle acceleration tube 64 are configured to form an acute angle A. Figure 4 The air ejected from the guide nozzle acceleration pipe 64 is ejected toward the deep wall side (inner side) of the weft traveling path 41, that is, in the direction B, and toward the inlet 41a of the weft traveling path 41.

[0049] In addition, the diameter of the outlet of the pilot nozzle accelerating tube 64 (the outlet of the pilot nozzle 60) is The diameter of the outlet of the first main nozzle accelerator tube 70 (the outlet of the main nozzle 22) is formed larger than and the diameter of the outlet of the second main nozzle acceleration tube 71 (the outlet of the main nozzle 22) The diameter of the outlet of the guide nozzle acceleration tube 64 is preferably The diameter of the outlet of the first main nozzle acceleration tube 70 and the diameter of the outlet of the second main nozzle acceleration tube 71 In addition, it is preferred that the cross-sectional area of ​​the outlet of the guide nozzle acceleration tube 64 is approximately 25% or less of the sum of the cross-sectional area of ​​the outlet of the first main nozzle acceleration tube 70 and the cross-sectional area of ​​the outlet of the second main nozzle acceleration tube 71. In addition, the diameter of the outlet of the guide nozzle acceleration tube 64 (the outlet of the guide nozzle 60) is The diameter of the outlet of the first main nozzle acceleration tube 70 (the outlet of the main nozzle 22) may be formed to be equal to the diameter of the outlet of the first main nozzle acceleration tube 70. and the diameter of the outlet of the second main nozzle acceleration tube 71 (the outlet of the main nozzle 22) The diameter of the outlet of the first main nozzle accelerator tube 70 (the outlet of the main nozzle 22) is preferably equal to or larger than the diameter of the outlet of the first main nozzle accelerator tube 70. and the diameter of the outlet of the second main nozzle acceleration tube 71 (the outlet of the main nozzle 22) Small.

[0050] Next, the operation of the air jet loom according to the first embodiment will be described.

[0051] exist Figure 1 When inserting the weft in the air jet loom 1 shown, the weft 11 is drawn out from the storage drum 12 and ejected into the main nozzle 22 by ejecting air from the double nozzle 21. The ejected weft 11 is inserted into the weft running path 41 of the profiled reed 40 by ejecting air from the main nozzle 22 and the guide nozzle 60 toward the inlet 41a of the weft running path 41. The air ejection from the double nozzle 21 is implemented by opening and closing control of the double valve 26 by the main control device 50. The air ejection from the main nozzle 22 is implemented by opening and closing control of the main valve 27 by the main control device 50. The air ejection from the guide nozzle 60 is implemented by opening and closing control of the guide nozzle valve 62 by the main control device 50.

[0052] The weft yarn 11 inserted into the weft yarn running path 41 of the profiled reed 40 is transported by air jets to the weft yarn running path 41 by the main nozzle 22 and the guide nozzle 60 and by air jets from the sub-nozzle 35, and runs downward in the weft yarn running path 41. The air jets from the sub-nozzle 35 are implemented by opening and closing the sub-valve 33 by the main control device 50.

[0053] Figure 5 is from the main nozzle 22 (refer to Figure 2 ) and the timing diagram of the air jet from the guide nozzle 60. Figure 1) During the period from when the rotation angle of the loom main shaft (not shown) during operation, that is, the crank angle is 0 degrees to when the next crank angle is 0 degrees, the main nozzle 22 sprays air from the main nozzle air injection start time M1 to the main nozzle air injection end time M2, and the guide nozzle 60 sprays air from the guide nozzle air injection start time N1 to the guide nozzle air injection end time N2. The guide nozzle air injection start time N1 of the guide nozzle 60 is before the main nozzle air injection start time M1. That is, at the main nozzle air injection start time M1 after a predetermined delay time T1 has passed from the guide nozzle air injection start time N1, the air injection from the main nozzle 22 is started. The guide nozzle air injection end time N2 is after a predetermined injection time T2 has passed from the guide nozzle air injection start time N1 and before the main nozzle air injection end time M2.

[0054] The jet time T2 of the guide nozzle 60 of the first embodiment is a time predetermined according to the type of the weft yarn 11 used. In addition, the guide nozzle air jet end time N2 of the guide nozzle 60 may be delayed to an arbitrary guide nozzle air jet end time N3 according to the type of the weft yarn 11, so that the air jet time is an arbitrary jet time T3 longer than the jet time T2. The guide nozzle air jet end time N3 is before the main nozzle air jet end time M2. In addition, the air jet pressure value of the guide nozzle 60 at this time is set to be greater than the air jet pressure value of the main nozzle 22.

[0055] Figure 6 The guide nozzle 60 of the first embodiment is not provided (see Figure 1 ) is a schematic diagram of the flow velocity distribution of the air in the weft yarn running path 41 when viewed from the inlet 41a side of the weft yarn running path 41 of the existing air jet loom. The measurement position of the air flow velocity distribution at this time is the position between the first sub-nozzle 35a closest to the main nozzle 22 and the second sub-nozzle 35b adjacent to the first sub-nozzle 35a. V1, V2 and V3 are lines connecting the positions where the air flow velocities are equal, V1 is the maximum flow velocity, V2 is the flow velocity second only to V1, and V3 is the minimum flow velocity. In the special-shaped reed 40 of the existing air jet loom, the air ejected from the main nozzle 22 diffuses and expands from the initial stage after the start of the injection. Then, the diffused and expanded air overflows to the front side (outside) of the weft yarn running path 41 and is discharged, so the air flow velocity V2 and the flow velocity V3 area are located on the front side of the weft yarn running path 41. That is, the air diffuses and expands to the outside of the weft yarn running path 41.

[0056] Therefore, in the existing profiled reed 40, especially when using a relatively high rigidity spun yarn, filament yarn, etc. as the weft yarn 11 (refer to Figure 1), there is a situation where the weft yarn 11 flows in the airflow discharged to the front side of the weft yarn running path 41 during weft insertion, causing the end of the weft yarn 11 to fly out to the front side (outside) of the weft yarn running path 41. In addition, in the existing special-shaped reed 40, there is a situation where the end of the weft yarn 11 returns to the deep wall side (inside) of the weft yarn running path 41 again because the weft yarn 11 runs from the upstream to the end, so that the weft yarn 11 needs a longer time to run a specified distance. Therefore, there is a situation where, depending on the flying condition of the end of the weft yarn 11, the weft yarn 11 cannot run to the exit of the weft yarn running path 41 within the specified time, and since the weft yarn 11 is not detected by the RH feeler 36, it is determined that the weft yarn 11 is inserted incorrectly.

[0057] Figure 7 The guide nozzle 60 of the first embodiment (see Figure 1 ) and the main nozzle 22 of the air jet loom 1 when observing the flow velocity distribution of the air in the weft yarn path 41 from the inlet 41a side of the weft yarn path 41. The measurement position of the air flow velocity distribution at this time is the same as Figure 6 At this time, at the main nozzle air injection start time M1 (refer to Figure 5 ), the guide nozzle 60 starts to spray air at a higher pressure value than the main nozzle 22. Therefore, a relatively high-speed airflow with less diffusion is formed on the inlet 41a side of the weft yarn running path 41. The relatively high-speed airflow formed initially guides the initial flow of the air sprayed from the main nozzle 22 after the spraying starts, into the weft yarn running path 41.

[0058] The air ejected from the main nozzle 22 is guided into the weft yarn running path 41 by the air ejection from the guide nozzle 60, thereby suppressing the diffusion and expansion of the air ejected from the main nozzle 22. Therefore, the discharge of the air to the front side (outside) of the weft yarn running path 41 is suppressed, and the air flow velocity V2 and the flow velocity V3 are located in the weft yarn running path 41. In addition, since there is a high-speed jet ejected from the guide nozzle 60 earlier than the main nozzle 22, there is a higher speed than the main nozzle 22. Figure 6 According to the above, even when using high-rigidity filament yarn, spun yarn, etc. as the weft yarn 11, weft insertion can be stably performed. As a result, the frequency of stopping the air jet loom 1 due to weft insertion errors can be reduced, and the operation rate of the air jet loom 1 can be improved.

[0059] On the other hand, if the outlet diameter is For large-diameter accelerating tubes Figure 4The first main nozzle accelerator tube 70 and the second main nozzle accelerator tube 71 shown in the figure increase the propulsion force of the weft yarn, but the degree of diffusion of the air ejected from the main nozzle 22 also increases. Therefore, such a large-diameter accelerator tube is difficult to use in practice. On the other hand, when the guide nozzle 60 is provided as in the present embodiment 1, the air ejected from the main nozzle 22 is guided into the weft yarn path 41 by the airflow ejected from the guide nozzle 60, thereby suppressing the discharge of air to the front side (outside) of the weft yarn path 41. Therefore, even if an accelerator tube with a large diameter at the outlet is used, the weft can be inserted stably. Thus, an accelerator tube with a large diameter at the outlet can be used, and the weft yarn 11 (refer to Figure 1 ) is improved to realize the lowering of the injection pressure of the sub-nozzle 35 and the reduction of the air consumption. Therefore, the operation cost of the air jet loom 1 can be reduced.

[0060] Figure 8 is the angle A between the length direction of the weft yarn path 41 and the guide nozzle acceleration tube 64 (see Figure 3 ), a coordinate graph showing the relationship between the frequency of weft yarn 11 flying out from the weft yarn path 41 during weft insertion, i.e., the weft yarn flying out frequency F, and the inconsistency G of the weft yarn arrival time to the RH feeler 36 caused by the flying out of the weft yarn 11. The horizontal axis of the coordinate graph represents the guide nozzle injection angle A, the vertical axis on the left side of the coordinate graph represents the weft yarn flying out frequency F, and the vertical axis on the right side of the coordinate graph represents the inconsistency G of the weft yarn arrival time. As a result of the experiment, it can be seen that if the angle A shown as the range E in the coordinate graph is in the range of about 5 to 25 degrees, the weft yarn flying out frequency F and the inconsistency G of the weft yarn arrival time can be suppressed to a lower range.

[0061] Thus, the weft insertion nozzle 20 of the air jet loom 1 according to the first embodiment includes: the profiled reed 40 having the weft running path 41; the main nozzle 22 for ejecting the weft 11 toward the weft running path 41 by ejecting air toward the inlet 41a of the weft running path 41; and the guide nozzle 60 which is arranged in parallel with the main nozzle 22 and ejects air toward the inlet 41a of the weft running path 41. Moreover, the guide nozzle air ejection start time N1 at which the guide nozzle 60 starts ejecting air is before the main nozzle air ejection start time M1 at which the main nozzle 22 starts ejecting air, so that the discharge of air toward the opening side of the weft running path 41 can be suppressed, and the weft 11 can be stably inserted into the weft running path 41.

[0062] In addition, the diameter of the outlet of the guide nozzle 60 is is the diameter of the outlet of the first main nozzle acceleration tube 70 of the main nozzle 22 and the diameter of the outlet of the second main nozzle acceleration tube 71 Therefore, the air ejected from the guide nozzle 60 can more effectively guide the air ejected from the main nozzle 22 into the weft yarn running path 41.

[0063] In addition, relative to the main nozzle 22, the guide nozzle 60 is arranged on the front side of the air jet loom 1, and the air injection direction is at an angle A of 5 to 25 degrees relative to the length direction of the weft yarn running path 41. Therefore, the air injected from the guide nozzle 60 can more effectively guide the air injected from the main nozzle 22 into the weft yarn running path 41.

[0064] Furthermore, since the pressure of the air ejected from the guide nozzle 60 is higher than the pressure of the air ejected from the main nozzle 22, the air ejected from the guide nozzle 60 can be more effectively guided into the weft running path 41 than the air ejected from the main nozzle 22.

[0065] In addition, since there are a main air tank 29 for storing air ejected from the main nozzle 22 and a guide nozzle air tank 63 which is separately arranged from the main air tank 29 and stores air ejected from the guide nozzle 60, the pressure of the air ejected from the guide nozzle 60 is stabilized without being affected by the main air tank 29 and is passed through the separate and independent guide nozzle air tank 63, so that the air ejected from the main nozzle 22 can be stably guided into the weft yarn path 41.

[0066] Furthermore, since the pilot nozzle air jetting end timing N2 at which the pilot nozzle 60 ends air jetting is before the main nozzle air jetting end timing M2 at which the main nozzle 22 ends air jetting, air consumption can be suppressed and the operating cost of the air jet loom 1 can be reduced.

[0067] In the first embodiment, the pressure value of the air ejected from the pilot nozzle 60 is higher than the pressure value of the air ejected from the main nozzle 22, but the pressure value of the air ejected from the pilot nozzle 60 may be lower than the pressure value of the air ejected from the main nozzle 22. In the present embodiment, the main air tank 29 and the pilot nozzle air tank 63 are independently provided, but the main air tank 29 may also serve as the pilot nozzle air tank 63. However, in order to stabilize the pressure of the air ejected from the pilot nozzle 60, it is preferable to provide an independent pilot nozzle air tank.

[0068] In addition, in the present embodiment 1, the guide nozzle air injection end time N2 at which the guide nozzle 60 ends the injection of air is before the main nozzle air injection end time M2 at which the main nozzle 22 ends the injection of air, but in order to simplify the control, the guide nozzle air injection end time N2 and the main nozzle air injection end time M2 can also be made simultaneous.

[0069] Implementation method 2.

[0070] Next, the weft insertion device of the air jet loom according to the second embodiment of the present invention will be described. Figures 1 to 8 The same reference numerals as those in the figure indicate the same or similar components, and therefore, their detailed description is omitted. The weft insertion device of the air jet loom according to the second embodiment is a structure in which the configurations of the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, and the guide nozzle acceleration tube 64 are changed relative to the first embodiment.

[0071] Figures 9 to 11 This is a schematic side view of the outlets of the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, and the guide nozzle acceleration tube 64, which are arranged differently from the first embodiment, as viewed from the profile reed 40 side. Fig. 9 In the embodiment shown, the guide nozzle accelerator tube 64 is arranged on the front side (outside) of the weft yarn running path 41 relative to the first main nozzle accelerator tube 70. In addition, the second main nozzle accelerator tube 71 is arranged on the front side of the weft yarn running path 41 relative to the guide nozzle accelerator tube 64. In this embodiment, the air ejected from the guide nozzle accelerator tube 64 is directed toward the deep wall side (inside) of the weft yarn running path 41, that is, the direction B and toward the inlet 41a of the weft yarn running path 41 (see Figure 1 ) injection. The other structures are the same as those in the first embodiment.

[0072] exist Fig.10 In the illustrated embodiment, the radial center of the outlet of the guide nozzle accelerator tube 64 is disposed on the upper side in the vertical direction relative to the radial centers of the outlets of the first main nozzle accelerator tube 70 and the second main nozzle accelerator tube 71. In addition, the radial center of the outlet of the guide nozzle accelerator tube 64 is disposed on the front side of the weft yarn running path 41 relative to the radial center of the outlet of the first main nozzle accelerator tube 70, and is disposed on the deep wall side of the weft yarn running path 41 relative to the radial center of the outlet of the second main nozzle accelerator tube 71. In this embodiment, the air ejected from the guide nozzle accelerator tube 64 is directed toward the deep wall side of the weft yarn running path 41 and vertically downward, i.e., obliquely downward inward, i.e., in the direction B, and toward the inlet 41a of the weft yarn running path 41 (refer to Figure 1 ) injection. The other structures are the same as those in the first embodiment.

[0073] exist Fig.11In the illustrated embodiment, the radial center of the outlet of the guide nozzle accelerator tube 64 is arranged on the lower side in the vertical direction relative to the radial centers of the outlets of the first main nozzle accelerator tube 70 and the second main nozzle accelerator tube 71. In addition, the radial center of the outlet of the guide nozzle accelerator tube 64 is arranged on the front side of the weft yarn running path 41 relative to the radial center of the outlet of the first main nozzle accelerator tube 70, and is arranged on the deep wall side of the weft yarn running path 41 relative to the radial center of the outlet of the second main nozzle accelerator tube 71. In this embodiment, the air ejected from the guide nozzle accelerator tube 64 is directed toward the deep wall side of the weft yarn running path 41 and vertically upward, that is, obliquely upward inside, that is, in the direction B, and toward the inlet 41a of the weft yarn running path 41 (refer to Figure 1 ) injection. The other structures are the same as those in the first embodiment.

[0074] In this way, the configuration of the first main nozzle accelerator tube 70, the second main nozzle accelerator tube 71 and the guide nozzle accelerator tube 64 involved in this embodiment 2 is the same as that in embodiment 1. The air ejected from the main nozzle 22 is also guided into the weft yarn running path 41 through the air injection from the guide nozzle 60, so that the weft yarn 11 can be stably inserted into the weft yarn running path 41.

[0075] Furthermore, the arrangement of the first main nozzle acceleration tube 70 , the second main nozzle acceleration tube 71 , and the pilot nozzle acceleration tube 64 described in the second embodiment is an example of the embodiment, and an arrangement other than the example arrangement may be used.

[0076] Implementation method 3.

[0077] Next, a weft insertion device of an air jet loom according to a third embodiment of the present invention will be described. Compared with the first embodiment, the weft insertion device of an air jet loom according to the third embodiment has a main nozzle changed to a main nozzle having a main nozzle accelerator tube corresponding to six-color weft yarns.

[0078] Fig.12 2 is a schematic diagram of the main nozzle 22 and the guide nozzle 60. The main nozzle 22 is a six-color main nozzle for feeding six-color wefts, and includes a main nozzle base 22a, and a first main nozzle acceleration tube 70, a second main nozzle acceleration tube 71, a third main nozzle acceleration tube 72, a fourth main nozzle acceleration tube 73, a fifth main nozzle acceleration tube 74, and a sixth main nozzle acceleration tube 75, which are respectively provided on the main nozzle base 22a and correspond to the colors of the wefts. In addition, the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, the third main nozzle acceleration tube 72, the fourth main nozzle acceleration tube 73, the fifth main nozzle acceleration tube 74, the sixth main nozzle acceleration tube 75, and the guide nozzle acceleration tube 64 are supported by an acceleration tube support member 81. The guide nozzle acceleration tube 64 is formed so that the diameter of the guide nozzle acceleration tube inlet 64b is larger than that of the guide nozzle acceleration tube outlet 64a.

[0079] Fig.13 This is a side view schematic diagram when the outlets of the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, the third main nozzle acceleration tube 72, the fourth main nozzle acceleration tube 73, the fifth main nozzle acceleration tube 74, the sixth main nozzle acceleration tube 75 and the guide nozzle acceleration tube 64 are viewed from the side of the profile reed 40. The first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, the third main nozzle acceleration tube 72, the fourth main nozzle acceleration tube 73, the fifth main nozzle acceleration tube 74 and the sixth main nozzle acceleration tube 75 are arranged in two layers, one above the other. In the upper layer, the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71 and the third main nozzle acceleration tube 72 are arranged in order from the deep wall side (inside) of the weft yarn running path 41. In the lower layer, the fourth main nozzle acceleration tube 73, the fifth main nozzle acceleration tube 74 and the sixth main nozzle acceleration tube 75 are arranged in order from the deep wall side of the weft yarn running path 41.

[0080] The guide nozzle accelerator tube 64 is disposed on the front side of the weft yarn running path 41 relative to the third main nozzle accelerator tube 72 and the sixth main nozzle accelerator tube 75. In addition, the radial center of the outlet of the guide nozzle accelerator tube 64 is disposed vertically below the radial center of the outlet of the third main nozzle accelerator tube 72 and vertically above the radial center of the outlet of the sixth main nozzle accelerator tube 75. The air ejected from the guide nozzle accelerator tube 64 is directed toward the deep wall side of the weft yarn running path 41, that is, in the direction B and toward the inlet 41a of the weft yarn running path 41 (see FIG. 1 ). Figure 1 ) injection. The other structures are the same as those in the first embodiment.

[0081] In this way, when the number of wefts corresponding to the number of main nozzle acceleration tubes used is 6, the air ejected from the main nozzle 22 is also guided into the weft running path 41 by the air ejection from the guide nozzle 60, and the weft 11 can be stably inserted into the weft running path 41. In addition, the guide nozzle acceleration tube 64 of the guide nozzle 60 is formed so that the diameter of the inlet is larger than that of the outlet, so that the pressure loss of the air in the guide nozzle acceleration tube 64 can be reduced, and the jet speed of the air ejected from the guide nozzle acceleration tube 64 can be increased.

[0082] In the third embodiment, the number of main nozzle accelerator tubes is 6, but the present invention is not limited thereto, and any number of main nozzle accelerator tubes corresponding to the number of colors of weft yarns used may be provided.

[0083] Implementation method 4.

[0084] Next, the weft insertion device of the air jet loom according to the fourth embodiment of the present invention will be described. Compared with the third embodiment, the weft insertion device of the air jet loom according to the fourth embodiment is a structure in which the arrangement of the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, the third main nozzle acceleration tube 72, the fourth main nozzle acceleration tube 73, the fifth main nozzle acceleration tube 74, the sixth main nozzle acceleration tube 75 and the guide nozzle acceleration tube 64 are changed. In addition, in the following embodiments, the arrangement of the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, the third main nozzle acceleration tube 72, the fourth main nozzle acceleration tube 73, the fifth main nozzle acceleration tube 74, the sixth main nozzle acceleration tube 75 and the guide nozzle acceleration tube 64 are changed. Fig.12 and Fig.13 The same reference numerals as those in the figures denote the same or similar components, and therefore, their detailed description is omitted.

[0085] Figure 14 to Figure 16 This is a side view schematic diagram of the outlets of the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, the third main nozzle acceleration tube 72, the fourth main nozzle acceleration tube 73, the fifth main nozzle acceleration tube 74, the sixth main nozzle acceleration tube 75 and the guide nozzle acceleration tube 64, which are configured differently from the third embodiment, when viewed from the side of the profiled reed 40. Fig.14 In the illustrated embodiment, the radial center of the outlet of the guide nozzle accelerator tube 64 is arranged on the front side of the weft yarn running path 41 relative to the radial center of the outlet of the second main nozzle accelerator tube 71 and the fifth main nozzle accelerator tube 74, and is arranged on the deep wall side of the weft yarn running path 41 relative to the radial center of the outlet of the third main nozzle accelerator tube 72 and the sixth main nozzle accelerator tube 75. Furthermore, the radial center of the outlet of the guide nozzle accelerator tube 64 is arranged on the lower side in the vertical direction relative to the radial center of the outlet of the second main nozzle accelerator tube 71 and the third main nozzle accelerator tube 72, and is arranged on the upper side in the vertical direction relative to the radial center of the outlet of the fifth main nozzle accelerator tube 74 and the sixth main nozzle accelerator tube 75. In this embodiment, the air ejected from the guide nozzle accelerator tube 64 is directed toward the deep wall side of the weft yarn running path 41, that is, the direction B and toward the inlet 41a of the weft yarn running path 41 (refer to Figure 1 ) injection. The other structures are the same as those in implementation mode 3.

[0086] exist Fig.15In the illustrated embodiment, the radial center of the outlet of the guide nozzle accelerator tube 64 is disposed on the upper side in the vertical direction relative to the radial centers of the outlets of the second main nozzle accelerator tube 71 and the third main nozzle accelerator tube 72. In addition, the radial center of the outlet of the guide nozzle accelerator tube 64 is disposed on the front side (outside) of the weft yarn running path 41 relative to the radial center of the outlet of the second main nozzle accelerator tube 71, and is disposed on the deep wall side (inside) of the weft yarn running path 41 relative to the radial center of the outlet of the third main nozzle accelerator tube 72. In this embodiment, the air ejected from the guide nozzle accelerator tube 64 is directed toward the deep wall side of the weft yarn running path 41 and vertically downward, i.e., obliquely downward inside, i.e., in the direction B, and toward the inlet 41a of the weft yarn running path 41 (refer to Figure 1 ) injection. The other structures are the same as those in implementation mode 3.

[0087] exist Fig.16 In the illustrated embodiment, the radial center of the outlet of the guide nozzle accelerator tube 64 is arranged on the lower side in the vertical direction relative to the radial centers of the outlets of the fifth main nozzle accelerator tube 74 and the sixth main nozzle accelerator tube 75. In addition, the radial center of the outlet of the guide nozzle accelerator tube 64 is arranged on the front side of the weft yarn running path 41 relative to the radial center of the outlet of the fifth main nozzle accelerator tube 74, and is arranged on the side of the depth wall relative to the radial center of the outlet of the sixth main nozzle accelerator tube 75. In this embodiment, the air ejected from the guide nozzle accelerator tube 64 is directed toward the side of the depth wall of the weft yarn running path 41 and vertically upward, i.e., obliquely upward inward, i.e., in the direction B, and toward the inlet 41a of the weft yarn running path 41 (refer to Figure 1 ) injection. The other structures are the same as those in implementation mode 3.

[0088] In this way, the configuration of the first main nozzle accelerator tube 70, the second main nozzle accelerator tube 71, the third main nozzle accelerator tube 72, the fourth main nozzle accelerator tube 73, the fifth main nozzle accelerator tube 74, the sixth main nozzle accelerator tube 75 and the guide nozzle accelerator tube 64 involved in this embodiment 4 is also the same as that in embodiment 3. By the air injection from the guide nozzle 60, the air injected from the main nozzle 22 is guided into the weft yarn running path 41, so that the weft yarn 11 can be stably introduced into the weft yarn running path 41.

[0089] In addition, the configurations of the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, the third main nozzle acceleration tube 72, the fourth main nozzle acceleration tube 73, the fifth main nozzle acceleration tube 74, the sixth main nozzle acceleration tube 75 and the guide nozzle acceleration tube 64 listed in this embodiment 4 are examples of embodiments and may also be configurations other than the illustrated configurations.

[0090] Implementation method 5.

[0091] Next, a weft insertion device for an air jet loom according to a fifth embodiment of the present invention will be described. The weft insertion device for an air jet loom according to the fifth embodiment is different from the first embodiment in that the shape of the outlet of the guide nozzle accelerating pipe is changed.

[0092] Fig.17 This is a plan view of the main nozzle 22 and the pilot nozzle 60 according to Embodiment 5. A bent portion 64c bent toward the first main nozzle accelerating tube 70 and the second main nozzle accelerating tube 71 of the main nozzle 22 is formed at the outlet of the pilot nozzle accelerating tube 64 of the pilot nozzle 60 .

[0093] The extending direction of the first main nozzle accelerating tube 70, i.e., the longitudinal direction of the weft yarn running path 41, forms an acute angle C with the bent portion 64c of the guide nozzle accelerating tube 64. In addition, the bent portion 64c is formed so that the angle C becomes larger than the angle formed by the longitudinal direction of the weft yarn running path 41 and the guide nozzle accelerating tube 64. The other structures are the same as those of the first embodiment.

[0094] In this way, a bent portion 64c of the guide nozzle accelerator tube 64 is formed, so that even if the angle of the guide nozzle accelerator tube 64 relative to the length direction of the weft yarn running path 41 cannot be made large due to constraints on the configuration space of the guide nozzle 60, the angle of the air ejected from the guide nozzle accelerator tube 64 relative to the length direction of the weft yarn running path 41 can be increased.

[0095] Implementation method 6.

[0096] Next, a weft insertion device for an air jet loom according to a sixth embodiment of the present invention will be described. Compared with the first embodiment, the weft insertion device for an air jet loom according to the sixth embodiment has a structure in which two outlets of the guide nozzle accelerating pipe are provided.

[0097] Fig.18 1 is a plan view of a pilot nozzle according to Embodiment 6. The pilot nozzle 66 has a pilot nozzle accelerating tube 64. The pilot nozzle accelerating tube 64 is provided with a total of two outlets, namely, a first pilot nozzle outlet 64d and a second pilot nozzle outlet 64e.

[0098] The first guide nozzle outlet 64d is formed with a bent portion 64c. The bent portion 64c forms an angle C with the extension direction of the first main nozzle accelerator tube 70, that is, the longitudinal direction of the weft yarn running path 41. The second guide nozzle outlet 64e is formed in a straight line and does not have a bent portion. In addition, the second guide nozzle outlet 64e is configured to form an angle A with the extension direction of the first main nozzle accelerator tube 70, that is, the longitudinal direction of the weft yarn running path 41.

[0099] Fig.19This is a side view schematic diagram of the first main nozzle acceleration tube 70, the second main nozzle acceleration tube 71, the first guide nozzle outlet 64d, and the second guide nozzle outlet 64e when viewed from the side of the profiled reed 40. The first guide nozzle outlet 64d is arranged on the front side of the weft yarn running path 41 relative to the second main nozzle acceleration tube 71. The second guide nozzle outlet 64e is arranged on the front side of the weft yarn running path 41 relative to the first guide nozzle outlet 64d. In addition, the air ejected from the first guide nozzle outlet 64d and the second guide nozzle outlet 64e is directed toward the deep wall side (inner side) of the weft yarn running path 41, that is, the direction B, and toward the inlet 41a of the weft yarn running path 41 (see FIG. 1 ). Figure 1 ) injection. The other structures are the same as those in the first embodiment.

[0100] As described above, since the guide nozzle 66 includes the first guide nozzle outlet 64d having the bent portion 64c and the linear second guide nozzle outlet 64e, the same effects as those of the air jet looms according to the first and fifth embodiments can be obtained.

[0101] In the sixth embodiment, the guide nozzle accelerating tube 64 is provided with two outlets in total, namely the first guide nozzle outlet 64 d and the second guide nozzle outlet 64 e , but three or more outlets in total may be provided.

[0102] Implementation method 7.

[0103] Next, a weft insertion device for an air jet loom according to a seventh embodiment of the present invention will be described. The weft insertion device for an air jet loom according to the seventh embodiment has a configuration in which the shape of the guide nozzle is changed compared to the first embodiment.

[0104] Fig. 20 1 is a schematic diagram of a guide nozzle of an air jet loom according to the seventh embodiment. The guide nozzle 60a is provided near the first main nozzle acceleration tube 70 and the second main nozzle acceleration tube 71 of the main nozzle 22. The guide nozzle 60a includes a rectangular parallelepiped main body 68, a connecting member 67 extending obliquely downward from the main body 68, and a guide nozzle terminal 64h extending upward from the main body 68. The connecting member 67 is connected to the air jet loom 1 (see Figure 1 ) is engaged with the T-slot 43 of the sley 42 to connect the sley 42 and the guide nozzle 60a.

[0105] The guide nozzle terminal portion 64h is arranged on the side close to the outlet of the first main nozzle acceleration tube 70 and the second main nozzle acceleration tube 71. In addition, a guide nozzle outlet hole 64f is provided at the guide nozzle terminal portion 64h. The guide nozzle outlet hole 64f is formed at a predetermined angle so that the direction of the opening forms an acute angle with respect to the extension direction of the first main nozzle acceleration tube 70. A guide nozzle supply port 65 is provided on the side of the main body 68 close to the main nozzle base 22a. An air flow path 64g is formed inside the guide nozzle 60a, which is connected from the guide nozzle supply port 65 to the guide nozzle terminal portion 64h. The other structures are the same as those in embodiment 1. In addition, the guide nozzle 60a can also be composed of a nozzle that is the same as the sub-nozzle 35.

[0106] Next, the operation of the air jet loom according to Embodiment 7 will be described. When the guide nozzle 60a ejects air, the air D supplied to the guide nozzle supply port 65 flows through the air flow path 64g and is ejected from the guide nozzle outlet hole 64f.

[0107] Thus, in the seventh embodiment, the elongated guide nozzle 60 (see Figure 2 ) The guide nozzle 60a has a different shape, and therefore, there is an advantage that the pressure loss of the air ejected by the guide nozzle 60a having a relatively short air flow path 64g compared with the guide nozzle 60 can be reduced. In addition, the guide nozzle 60a of the present embodiment 7 is installed on the air jet loom 1 by combining the connecting member 67 with the T-slot 43 of the sley 42. Therefore, when the number or arrangement of the main nozzle accelerator tubes is changed due to a change in the number of colors of the weft yarn used, etc., the position of the guide nozzle outlet hole 64f can be simply changed by adopting a corresponding method such as setting a spacer (not shown) between the T-slot 43 and the connecting member 67, which can reduce the initial cost generated before the air jet loom 1 is put into operation.

Claims

1. A weft insertion device for an air jet loom, characterized in that: have: a profiled reed having a weft yarn running path; and a main nozzle for ejecting the weft yarn toward the weft yarn running path by injecting air toward the inlet of the weft yarn running path, The weft insertion device includes a guide nozzle, which is arranged in parallel with the main nozzle and guides the air ejected from the main nozzle into the weft yarn path by ejecting air toward the inlet of the weft yarn path, thereby suppressing the discharge of air to the outside of the weft yarn path. The pilot nozzle starts to inject air at a pressure value greater than the pressure value of the air injected by the main nozzle before the main nozzle starts to inject air. The guide nozzle guides the initial flow of the air ejected from the main nozzle into the weft yarn running path after the ejection of the air starts, by forming an air flow that is faster than the air ejected from the main nozzle at the entrance side of the weft yarn running path before the air ejected from the main nozzle reaches the entrance of the weft yarn running path.

2. The weft insertion device of the air jet loom according to claim 1, characterized in that: The diameter of the outlet of the pilot nozzle is smaller than the diameter of the outlet of the main nozzle.

3. The weft insertion device of the air jet loom according to claim 1 or 2, characterized in that: The guide nozzle is arranged at the front side of the profiled reed relative to the main nozzle, and the jetting direction of the air forms an acute angle with respect to the length direction of the weft yarn running path.

4. The weft insertion device of the air jet loom according to claim 1 or 2, characterized in that: The air tank includes a main air tank for storing air ejected from the main nozzle and a pilot nozzle air tank for storing air ejected from the pilot nozzle.

5. The weft insertion device of the air jet loom according to claim 1 or 2, characterized in that: The pilot nozzle ends the injection of air at a time before the main nozzle ends the injection of air.

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