Interlacing device and yarn winding machine

Abstract

To reduce flow rate irregularity of fluid among a plurality of nozzles in an entangling device for entangling a plurality of yarns.SOLUTION: An entangling device 13 has a plurality of nozzles 66 for injecting compressed air to a plurality of yarns Y arranged in an arrangement direction and a feed channel 70 configured to feed the compressed air to the plurality of nozzles 66. The feed channel 70 has at least an inflow path 42 extending in the arrangement direction, a chamber 71 that is disposed between the inflow path 42 and the plurality of nozzles 66 in a flow direction of the compressed air and extends in the arrangement direction and a height direction, and a bent flow path 43 that is disposed between the inflow path 42 and the chamber 71 in the flow direction and bends from the arrangement direction toward the height direction. At least on the bent flow path 43, one or more rectifier fins 72 extending in the height direction are provided so as to at least partially overlap an opening 41f (inlet of the bent flow path) when seen from an extending direction in which the inflow path 42 extends.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an intertwining device and a yarn winding machine equipped with the intertwining device. [Background technology]

[0002] Patent Document 1 discloses an intertwining device that entangles multiple yarns and a yarn winding machine that winds the multiple yarns that have been entangled by the intertwining device to simultaneously form multiple packages. The intertwining device includes multiple nozzles for spraying a fluid onto each of the multiple yarns and a supply flow path that supplies the fluid to the multiple nozzles. The supply flow path extends at least in the direction in which the multiple nozzles are arranged. When the fluid is supplied to the supply flow path, the fluid flows into the multiple nozzles via the supply flow path and is sprayed from each nozzle to entangle each yarn. Although not described in Patent Document 1, for example, by arranging the inlet portion of the supply flow path to extend approximately parallel to the supply flow path, the fluid can be efficiently delivered to the back of the supply flow path. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-160550 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to reduce the variation in yarn quality among multiple yarns, it is necessary to make the efficiency of entangling multiple yarns as uniform as possible. One measure to achieve this is to reduce the variation in fluid flow velocity among nozzles. In particular, in recent years, the number of yarns that can be entangled at one time in an entangling device has been increasing, making the reduction of the variation in flow velocity among nozzles an even more important issue.

[0005] An object of the present invention is to reduce variations in fluid flow speed among a plurality of nozzles in an entangling device that entangles a plurality of yarns. [Means for solving the problem]

[0006] The entanglement device of the first invention is an entanglement device that entangles a plurality of yarns with a fluid, and comprises a plurality of nozzles arranged in a predetermined first direction for spraying the fluid onto each of the plurality of yarns, and a supply flow path configured to supply the fluid to the plurality of nozzles, wherein the supply flow path has an inlet flow path extending at least in the first direction into which the fluid flows, a chamber arranged between the inlet flow path and the plurality of nozzles in the flow direction of the fluid, the chamber extending in the first direction and also extending in a second direction intersecting the first direction, and a bent flow path arranged between the inlet flow path and the chamber in the flow direction, the bent flow path bending from the first direction toward the second direction, and wherein at least the bent flow path is provided with one or more rectifying fins arranged to extend in the second direction and to at least partially overlap with an inlet of the bent flow path when viewed from the extension direction of the inlet flow path.

[0007] In a configuration in which a curved flow path is provided in a supply flow path, for example, when a high-pressure fluid is supplied to the supply flow path, a large amount of the fluid tends to reach the end position of the curved flow path far from the inlet in the first direction, which may increase the flow velocity at the end position far from the inlet in the first direction, resulting in a large difference from the flow velocity at a position closer to the inlet.

[0008] In the present invention, a fluid that has flowed into a supply channel flows in at least a first direction in the inlet channel, and then, in the curved channel, its flow direction is changed from a direction having a component in the first direction to a direction having at least a component in a second direction. At this time, a portion of the fluid flowing in the first direction can be received by one or more straightening fins. This allows the fluid to be straightened while preventing a large amount of fluid from flowing into a space farther from the inlet channel in the curved channel. Therefore, the flow velocity of the fluid flowing within the chamber can be made uniform in the first direction compared to when no straightening fins are provided. This reduces variation in flow velocity among multiple nozzles.

[0009] The interlacing device of the second invention is characterized in that, in the first invention, the one or more straightening fins are a plurality of straightening fins arranged in a line in the first direction, and the more the plurality of straightening fins are farther from the inlet in the first direction, the larger the area of ​​the portion overlapping with the inlet when viewed from the extension direction.

[0010] The present invention can effectively prevent a large amount of fluid from reaching the end of the curved flow path farther from the inlet in the first direction. Furthermore, the present invention can receive the fluid little by little by each straightening fin. Therefore, the fluid can be distributed approximately evenly in the first direction within the curved flow path. Therefore, the variation in the flow velocity of the fluid supplied to the chamber through the curved flow path in the first direction can be effectively reduced.

[0011] The interlacing device of the third invention is characterized in that, in the first or second invention, the one or more straightening fins are a plurality of straightening fins arranged side by side in the first direction, and ends of the plurality of straightening fins that are closer to the plurality of nozzles in the second direction are arranged side by side along the first direction.

[0012] The downstream end in the flow direction of the space formed between two adjacent rectifying fins in the first direction (or between the wall forming the curved flow path and the rectifying fin) is provisionally referred to as the outlet. In the present invention, the distance in the second direction from the multiple outlets to the multiple nozzles can be made approximately constant without changing depending on the position in the first direction. Therefore, compared to, for example, a case where the distance varies depending on the position in the first direction, it is possible to reduce the risk that the flow velocity variation reduced in the first direction by the rectifying fins will increase again within the chamber.

[0013] The intertwining device of the fourth invention is characterized in that, in any one of the first to third inventions, the chamber has a downstream region that is located closer to the plurality of nozzles in the second direction than a straightening region, which is a region in which the one or more straightening fins are arranged, and the downstream region is longer in the second direction than the straightening region.

[0014] In the present invention, the fluid, after being rectified by the rectifying fins, travels a long distance in the second direction before reaching the multiple nozzles. As a result, adjacent molecules of the fluid, after being rectified by the rectifying fins, collide with each other and are encouraged to move in a generally straight line along the second direction. This makes it possible to more effectively reduce the variation in flow velocity among the multiple nozzles.

[0015] The intertwining device of the fifth invention is characterized in that, in the fourth invention, the length of the downstream region in the second direction is at least twice the length of the flow straightening region.

[0016] The inventors of the present application have found that when the length of the downstream region in the second direction is at least twice the length of the flow straightening region, the variation in flow velocity is reduced significantly.

[0017] The interlacing device of the sixth invention is characterized in that, in any one of the first to fifth inventions, the chamber has a first downstream region arranged downstream in the flow direction of the straightening region, which is a region in which the one or more straightening fins are arranged, and a second downstream region arranged downstream in the flow direction of the first downstream region, the second downstream region having a length in a third direction perpendicular to both the first direction and the second direction shorter than the length of the first downstream region in the third direction.

[0018] Generally, for a given fluid flow rate, the flow velocity is relatively slow where the cross-sectional area of ​​the flow path is large, and the flow velocity is relatively fast where the cross-sectional area is small. In other words, the flow velocity is fast in a nozzle with a small cross-sectional area. Here, if the cross-sectional area of ​​the flow path suddenly decreases immediately upstream of the nozzle in the flow direction, the flow velocity suddenly increases, and there is a risk that the flow of the fluid will be easily disturbed near the nozzle. In the present invention, the cross-sectional area of ​​the flow path in the second downstream region is smaller than the cross-sectional area of ​​the flow path in the first downstream region. That is, in the chamber, the cross-sectional area of ​​the flow path can be gradually (at least stepwise) reduced toward the downstream side in the flow direction. This allows the flow velocity of the fluid to be increased at least stepwise. This makes it possible to prevent the flow velocity from increasing suddenly near the nozzle. Therefore, it is possible to prevent the flow of the fluid from being disturbed near the nozzle.

[0019] The intertwining device of a seventh invention is the sixth invention, characterized in that the second downstream region is longer than the first downstream region in the second direction.

[0020] When fluid moves from the first downstream region, which has a large cross-sectional area, to the second downstream region, which has a relatively small cross-sectional area, a large amount of compressed air enters the relatively narrow flow path, which can cause some turbulence in the airflow. Therefore, by lengthening the downstream region in the height direction, the turbulence in the airflow can be effectively alleviated while directing the compressed air downstream in the flow direction. Therefore, the flow velocity variation can be further reduced.

[0021] The yarn winding machine of the eighth invention is characterized by comprising an intertwining device of any one of the first to seventh inventions, and a winding section that winds multiple yarns that have been entangled by the intertwining device to simultaneously form multiple packages.

[0022] In the present invention, it is possible to reduce variations in the efficiency of entanglement among a plurality of yarns, and therefore to reduce variations in quality among a plurality of packages formed simultaneously. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a side view of a spinning take-up machine equipped with an intertwining device according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. 2 is a view of the interlacing device as seen from the yarn running direction. [Figure 4] FIG. 2 is a cross-sectional view of the interlacing device, taken perpendicular to the yarn running direction. [Figure 5] 5A is a view taken along the arrow V(a) in FIG. 4, and FIG. 5B is a cross-sectional view taken along the line V(b)-V(b) in FIG. [Figure 6] FIG. 2 is a perspective view of an interlacing unit. [Figure 7] FIG. 5 is an enlarged view of FIG. 4, showing a cross-sectional view of a plurality of interlacing pieces and their vicinity. [Figure 8] 10 is a table showing analysis results of the average flow velocity of a fluid and the flow velocity variation between nozzles. [Figure 9] 9(a) and 9(b) are tables showing some of the analysis results shown in FIG. 8. [Figure 10] 9(a) and 9(b) are tables showing some of the analysis results shown in FIG. 8. [Figure 11] 9 is a table showing a part of the analysis results shown in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0024] Next, an embodiment of the present invention will be described. For convenience of explanation, the directions shown in Fig. 1 are referred to as the up-down direction and the front-back direction. The up-down direction is the vertical direction in which gravity acts. The front-back direction is the direction perpendicular to the up-down direction in which multiple bobbins B (described later) are arranged side by side. The direction perpendicular to both the up-down direction and the front-back direction (the direction perpendicular to the paper surface) is referred to as the left-right direction. The direction in which a yarn Y (described later) runs is referred to as the yarn running direction.

[0025] (Yarn take-up machine) An outline of a yarn take-up machine 1 (yarn winding machine of the present invention) according to this embodiment will be described with reference to FIG. 1. FIG. 1 is a side view of the yarn take-up machine 1 equipped with an interlacing device 13 (described below) according to this embodiment. The yarn take-up machine 1 is configured to take up multiple yarns Y (e.g., 32 yarns in this embodiment) spun from a spinning device 2 and wind them onto multiple bobbins B, respectively, to simultaneously form multiple packages P. Each yarn Y is a multifilament yarn having multiple filaments (not shown). Each filament is a synthetic fiber made of, for example, polyester.

[0026] The yarn take-off machine 1 includes, for example, a take-off section 3 and two winding sections 4 (winding sections 4A and 4B; only one winding section 4A is shown in FIG. 1). The take-off section 3 is configured to take up a plurality of yarns Y (32 yarns in this embodiment) spun from the spinning device 2. The take-off section 3 includes, for example, a drawing device 10, a first godet roller 11, a second godet roller 12, and an entangling device 13. The drawing device 10 is disposed below the spinning device 2. The drawing device 10 includes a plurality of drawing rollers (not shown) and is configured to draw the yarns Y. The first godet roller 11 is a roller whose rotation axis direction is approximately parallel to the left-right direction. The first godet roller 11 is disposed downstream of the drawing device 10 in the yarn running direction. The first godet roller 11 is rotationally driven by a motor (not shown). The multiple yarns Y spun from the spinning device 2 are arranged in the left-right direction and wound around the first godet roller 11 before being sent to the second godet roller 12. The second godet roller 12 is a roller whose rotation axis direction is approximately parallel to the left-right direction. The second godet roller 12 is disposed above and behind the first godet roller 11. The second godet roller 12 is driven to rotate by a motor (not shown). Each of the multiple yarns Y is sent from the first godet roller 11 to the second godet roller 12 and then sent to one of the two winding sections 4. Half of the multiple yarns Y are sent to the winding section 4A, and the other half are sent to the winding section 4B. The yarn path along which the yarn Y travels from the first godet roller 11 to the second godet roller 12 extends diagonally upward and rearward. This yarn path has both vertical and longitudinal components and is approximately perpendicular to the left-right direction. The entangling device 13 is disposed, for example, between the drawing device 10 and the first godet roller 11 in the yarn running direction. Alternatively, the entangling device 13 may be disposed between the first godet roller 11 and the second godet roller 12 in the yarn running direction. Alternatively, two entangling devices 13 may be disposed, one between the drawing device 10 and the first godet roller 11 in the yarn running direction, and the other between the first godet roller 11 and the second godet roller 12 in the yarn running direction. The entangling device 13 is configured to entangle each of the multiple yarns Y (details will be described later).

[0027] Each of the two winding units 4 (winding units 4A, 4B) is configured to wind multiple yarns Y onto multiple bobbins B to simultaneously form multiple packages P. For example, in this embodiment, each of the winding units 4A, 4B is configured to wind 16 yarns Y. The winding units 4A, 4B are arranged below the take-up unit 3. The winding units 4A, 4B are arranged side by side in the left-right direction. In FIG. 1, only the winding unit 4A is shown. The winding unit 4B is arranged on the far side of the page of the winding unit 4A in FIG. 1 (for more details, see, for example, Japanese Patent Application Laid-Open No. 2020-20069). The winding unit 4B may have the same structure as the winding unit 4A. Alternatively, the winding unit 4B may be configured symmetrically to the winding unit 4A, with a plane parallel to both the up-down direction and the front-to-rear direction as the plane of symmetry. Each winding unit 4 includes a plurality of fulcrum guides 21, a plurality of traverse guides 22, a turret 23, two bobbin holders 24, and a contact roller 25.

[0028] The multiple fulcrum guides 21 serve as fulcrums when the yarn Y is traversed by each traverse guide 22. The multiple fulcrum guides 21 are provided corresponding to the multiple yarns Y, respectively. The multiple fulcrum guides 21 are arranged in the front-rear direction. Like the multiple fulcrum guides 21, the multiple traverse guides 22 are also provided corresponding to the multiple yarns Y, respectively. The multiple traverse guides 22 are arranged side by side in the front-rear direction. The traverse guides 22 are configured to traverse the yarn Y in the front-rear direction by being driven, for example, by a traverse motor (not shown). The turret 23 is a disk-shaped member whose rotation axis direction is approximately parallel to the front-rear direction. The turret 23 is rotationally driven by a turret motor (not shown). Each of the two bobbin holders 24 has its rotation axis direction approximately parallel to the front-rear direction and is rotatably supported at the upper and lower ends of the turret 23. A plurality of bobbins B corresponding to the multiple yarns Y, respectively, are attached to each bobbin holder 24 and arranged side by side in the front-rear direction. The multiple bobbins B are rotatably supported by bobbin holders 24. Each of the two bobbin holders 24 is independently rotated by a winding motor (not shown). The contact roller 25 is a roller whose rotation axis direction is approximately parallel to the front-to-rear direction, and is disposed immediately above the upper bobbin holder 24. The contact roller 25 comes into contact with the surfaces of the multiple packages P supported by the upper bobbin holder 24, thereby applying contact pressure to the surfaces of the packages P during winding and shaping the packages P.

[0029] In each of the two winding units 4 having the above-described configuration, when the upper bobbin holder 24 is rotationally driven, the yarn Y traversed by the traverse guide 22 is wound onto the bobbin B to form a package P. When the package P is fully wound, the turret 23 is rotated, swapping the upper and lower positions of the two bobbin holders 24. As a result, the lower bobbin holder 24 moves upward, and the yarn Y can be wound onto the bobbin B attached to this bobbin holder 24 to form the package P. The bobbin holder 24 with the fully wound package P attached thereto moves downward. The fully wound package P is collected, for example, by a package collection device (not shown).

[0030] (Interlacing device) Next, the configuration of the interlacing device 13 will be described with reference to FIGS. 2 to 7. FIG. 2 is a perspective view of the entire interlacing device 13. FIG. 3 is a view of the interlacing device 13 as seen from the yarn traveling direction. Here, the yarn traveling direction in the interlacing device 13 (third direction of the present invention) is a direction substantially parallel to the direction in which each of the multiple interlacing pieces 63 described later extends. FIG. 4 is a cross-sectional view of the interlacing device 13 perpendicular to the yarn traveling direction. FIG. 5(a) is a view seen from the arrow V(a) in FIG. 4. FIG. 5(b) is a cross-sectional view taken along line V(b)-V(b) in FIG. 4. FIG. 6 is a perspective view of the interlacing unit 33 described later. FIG. 7 is a cross-sectional view of the multiple interlacing pieces 63 and their vicinity perpendicular to the yarn traveling direction. As will be described later, the direction in which the multiple interlacing pieces 63 are arranged side by side is referred to as the arrangement direction (first direction of the present invention). As will be described later, the direction perpendicular to both the yarn traveling direction and the arrangement direction is referred to as the height direction (second direction of the present invention). For convenience of explanation, "one side" and "the other side" in each of the yarn running direction, the arrangement direction, and the height direction are defined as shown in FIG.

[0031] The entangling device 13 is configured to entangle each of the multiple (e.g., 32 in this embodiment) yarns Y, for example, by using compressed air (the fluid of the present invention). To entangle roughly means to intertwine the multiple filaments (not shown) constituting each yarn Y with one another in order to prevent the multiple filaments from becoming too far apart from one another.

[0032] As shown in FIGS. 2 to 5(b), the entanglement device 13 includes, for example, a fluid supply member 31, a connecting member 32, and an entanglement unit 33. The fluid supply member 31, the connecting member 32, and the entanglement unit 33 are arranged in this order in a predetermined height direction perpendicular to the yarn running direction. Hereinafter, the fluid supply member 31 side in the height direction will be referred to as "one side." The entanglement unit 33 side in the height direction will be referred to as "the other side." Roughly speaking, compressed air flowing into the fluid supply member 31 from a supply source 100 (see FIG. 3) is supplied to the entanglement unit 33 via the connecting member 32. As a result, compressed air ejected from each of the multiple nozzles 66 (see FIG. 4, etc.) provided in the entanglement unit 33 is sprayed onto each of the multiple yarns Y. As a result, each yarn Y is entangled. In other words, the entangling device 13 includes a plurality of nozzles 66 for spraying compressed air onto the plurality of yarns Y, and a supply flow path 70 configured to supply compressed air to the plurality of nozzles 66 (see FIG. 4). In this embodiment, the supply flow path 70 is configured by a fluid supply member 31, a connection member 32, and a part of the entanglement unit 33. Details of the supply flow path 70 will be described later.

[0033] The fluid supply member 31 is configured to send the compressed air supplied from the supply source 100 downstream (toward the entanglement unit 33) in the flow direction of the compressed air (hereinafter simply referred to as the flow direction). The other end of the fluid supply member 31 in the height direction is fixed to one end of the connection member 32 in the height direction by, for example, a plurality of screws (not shown).

[0034] As shown in FIGS. 2 to 4, the fluid supply member 31 has a main body 41 and an inlet channel 42. The main body 41 is a substantially rectangular parallelepiped portion. The main body 41 has a bottom surface 41a (see FIGS. 3 to 5(b)) that is substantially perpendicular to the height direction, inner side surfaces 41b and 41c (see FIGS. 3 and 4), and inner side surfaces 41d and 41e (see FIGS. 5(a) and 5(b)). The bottom surface 41a is provided substantially perpendicular to the height direction and is a surface located at one end of the main body 41 in the height direction. The inner side surface 41b extends in the height direction and is a surface located at one end of the main body 41 in the arrangement direction. The inner side surface 41c extends in the height direction and is a surface located at the other end of the main body 41 in the arrangement direction. The inner side surfaces 41b and 41c face each other in the arrangement direction. An opening 41f (see Figs. 3 to 5(b)), for example, having a substantially circular shape, is formed at one end in the height direction of the wall on which the inner surface 41b is formed. One end in the arrangement direction of the main body 41 is connected to the inlet channel 42 via the opening 41f. The opening 41f is an entrance to a curved channel 43, which will be described later. The inner surface 41d extends in the height direction and is a surface located at one end of the main body 41 in the yarn traveling direction. The inner surface 41e extends in the height direction and is a surface located at the other end of the main body 41 in the yarn traveling direction. The inner surfaces 41d and 41e face each other in the yarn traveling direction.

[0035] As shown in FIG. 4, the main body 41 has a curved flow path 43 disposed on one side of the other end of the opening 41f in the height direction, and a chamber-forming flow path 44 disposed on the other side of the other end of the opening 41f in the height direction. The curved flow path 43 is a portion bent from the arrangement direction to the height direction. The curved flow path 43 is disposed between the inlet flow path 42 and the chamber-forming flow path 44 in the flow direction. The curved flow path 43 is disposed on the other side of the inlet flow path 42 in the arrangement direction, and on one side of the chamber-forming flow path 44 in the height direction. More specifically, when viewed from the yarn running direction, a virtual straight line passing through the other end of the opening 41f in the height direction and extending in the arrangement direction is defined as a straight line 101 (see FIG. 4). The curved flow path 43 is a portion disposed on one side of the straight line 101 in the height direction. The chamber-forming flow path 44 is disposed on the other side of the curved flow path 43 in the height direction (i.e., on the other side of the straight line 101) and extends in the height direction. The chamber-forming flow path 44 constitutes a part of a chamber 71, which will be described later. The other end of the chamber-forming flow path 44 in the height direction is connected to one end of a connection flow path 45, which will be described later, in the height direction.

[0036] The inlet channel 42 is a portion arranged on the upstream side of the main body 41 in the flow direction. The inlet channel 42 is arranged to extend, for example, along the arrangement direction. That is, in this embodiment, the arrangement direction is the extension direction of the inlet channel 42. The inlet channel 42 is arranged on one side of the main body 41 in the arrangement direction. The inlet channel 42 is connected to the curved flow path 43 via an opening 41f. To the inlet channel 42, for example, the tip of a hose (not shown) extending from the supply source 100 (see FIG. 3) is attached.

[0037] The connecting member 32 is, for example, a substantially rectangular parallelepiped member. The connecting member 32 is configured to connect the fluid supply member 31 and the entanglement unit 33. The connecting member 32 is disposed downstream of the fluid supply member 31 and upstream of the entanglement unit 33 in the flow direction. One end of the connecting member 32 in the height direction is fixed to the other end of the main body 41 of the fluid supply member 31 in the height direction. The other end of the connecting member 32 in the height direction is fixed to one end of the entanglement unit 33 in the height direction by, for example, a plurality of screws (not shown). The connecting member 32 has a connecting flow path 45 penetrating therethrough in the height direction. The connecting flow path 45 constitutes a part of the chamber 71 described below. In this embodiment, the cross-sectional area of ​​the connecting flow path 45 perpendicular to the height direction is, for example, substantially equal to the cross-sectional area of ​​the chamber-forming flow path 44 perpendicular to the height direction.

[0038] The entanglement unit 33 is configured to entangle the plurality of yarns Y by spraying compressed air supplied from a supply source 100 onto the plurality of yarns Y. As shown in FIG. 6 , the entanglement unit 33 has a base member 51, an entanglement section 52, two guide support members 53 and 54, and two regulating guide members 55 and 56.

[0039] The base member 51 is a generally rectangular parallelepiped member. One end of the base member 51 in the height direction is fixed to the other end of the connecting member 32 in the height direction. A main pipe flow path 61 and multiple branch flow paths 62 are formed in the base member 51. The main pipe flow path 61 and the multiple branch flow paths 62 are configured to flow compressed air to the other side in the height direction. The main pipe flow path 61 is a flow path formed from one end of the base member 51 in the height direction to the other side. The main pipe flow path 61 extends in the arrangement direction from the position where the nozzle 66 on the most one side of the multiple nozzles 66 described below is arranged to the position where the nozzle 66 on the most other side is arranged. The main pipe flow path 61 forms a part of a chamber 71 described below. Further details of the main pipe flow path 61 will be described later. The multiple branch flow paths 62 are flow paths branching off from the main pipe flow path 61. The multiple branch flow paths 62 are arranged at the other end of the base member 51 in the height direction and are arranged side by side in the arrangement direction. Each of the plurality of branch flow paths 62 is connected to, for example, two of the plurality of nozzles 66 described below.

[0040] As shown in FIGS. 6 and 7 , the intertwining section 52 has a plurality of intertwining pieces 63 (16 in this embodiment) arranged side by side in the arrangement direction. Each of the intertwining pieces 63 extends in the yarn traveling direction. The intertwining pieces 63 are fixed to the other end face of the base member 51 in the height direction. Each of the intertwining pieces 63 has two yarn traveling spaces 64 (yarn traveling spaces 64a, 64b), two yarn insertion slits 65 (yarn insertion slits 65a, 65b), and two nozzles 66 (nozzles 66a, 66b), as shown in FIG. 7 . The two yarn traveling spaces 64 penetrate the intertwining piece 63 in the yarn traveling direction. One yarn Y travels through each yarn traveling space 64. The two yarn traveling spaces 64 include a yarn traveling space 64a arranged on one side in the arrangement direction and a yarn traveling space 64b arranged on the other side in the arrangement direction. The yarn insertion slit 65a is disposed, for example, on one side in the arrangement direction of the yarn traveling space 64a. The yarn insertion slit 65a extends in the yarn traveling direction along the yarn traveling space 64a. The yarn insertion slit 65b is disposed, for example, on the other side in the arrangement direction of the yarn traveling space 64b. The yarn insertion slit 65b extends in the yarn traveling direction along the yarn traveling space 64b. The nozzle 66 is disposed on the other side in the height direction of the branch flow path 62 and on one side in the height direction of the corresponding yarn traveling space 64. In other words, the nozzle 66 is disposed downstream in the flow direction of the branch flow path 62 and upstream in the flow direction of the corresponding yarn traveling space 64. In this embodiment, the nozzle 66 extends at least in the height direction. The nozzle 66 may, for example, have a component extending in the yarn traveling direction (i.e., may be inclined obliquely with respect to the height direction). Furthermore, each entangling piece 63 does not necessarily have to be configured to entangle two yarns Y. For example, the interlacing section 52 may have 32 interlacing pieces (not shown), each configured to impart interlacing to a corresponding yarn Y.

[0041] The guide support member 53 is a member that supports the restricting guide member 55. As shown in FIG. 6 , the guide support member 53 is a generally U-shaped plate member. The guide support member 53 is fixed to one side surface of the base member 51 in the yarn traveling direction. The guide support member 54 is a member that supports the restricting guide member 56. Like the guide support member 53, the guide support member 54 is also a generally U-shaped plate member. The guide support member 54 is fixed to the other side surface of the base member 51 in the yarn traveling direction. Note that instead of the base member 51 and the guide support members 53, 54, a single base member (not shown) may be provided. In the base member (not shown), a base portion (not shown) that functions as the base member 51 and guide support portions (not shown) that function as the guide support members 53, 54 may be integrally formed.

[0042] The restricting guide members 55, 56 are members that restrict movement of the multiple yarns Y in the arrangement direction. As shown in Fig. 6, the restricting guide member 55 is fixed to the guide support member 53. The restricting guide member 56 is fixed to the guide support member 54. Each of the restricting guide members 55, 56 has multiple guide grooves 57 formed and aligned in the arrangement direction. The yarn Y is inserted into each of the multiple guide grooves 57.

[0043] The compressed air supplied to the entangling device 13 having the above configuration flows into the plurality of nozzles 66, passing through the inlet channel 42, the bent channel 43, the chamber-forming channel 44, the connecting channel 45, the main channel 61, and the branch channel 62, in that order from the upstream side in the flow direction. Then, compressed air is sprayed from each of the plurality of nozzles 66 into the corresponding yarn traveling space 64. This causes the yarn Y traveling in the yarn traveling space 64 to be entangled.

[0044] Here, in order to reduce variations in yarn quality among the plurality of yarns Y, it is necessary to make the efficiency of imparting entanglement to the plurality of yarns Y as uniform as possible. As one measure to achieve this, it is desirable to reduce variations in the flow velocity of compressed air among the nozzles 66. Therefore, in order to reduce variations in the flow velocity of compressed air, the entanglement device 13 has the following configuration.

[0045] (Detailed configuration of the interlacing device) The detailed configuration of the intertwining device 13 will be described with reference to FIGS. 4 to 5(b). First, the supply flow path 70 will be described again. The supply flow path 70 includes, in order from the upstream side in the flow direction, the inlet channel 42, the bent flow path 43, and a chamber 71. The chamber 71 is configured, for example, with a chamber-forming flow path 44 formed in the fluid supply member 31, a connecting flow path 45 formed in the connecting member 32, and a main flow path 61 formed in the base member 51 of the entanglement unit 33. The chamber 71 extends in the height direction from one end of the chamber-forming flow path 44 to the other end of the main flow path 61. In addition, in this embodiment, the chamber 71 extends in the arrangement direction from the position where the nozzle 66 on the most one side is arranged to the position where the nozzle 66 on the most other side is arranged.

[0046] At least one rectifying fin 72 is arranged in at least the curved flow path 43. In this embodiment, a plurality of rectifying fins 72 are provided. Each of the plurality of rectifying fins 72 extends, for example, in the height direction. The plurality of rectifying fins 72 are arranged, for example, at approximately equal intervals in the arrangement direction. When viewed from the arrangement direction (the extension direction of the inflow channel 42), the plurality of rectifying fins 72 partially overlap with the opening 41f (see FIGS. 5(a) and 5(b)). When viewed from the arrangement direction, it is preferable that the lengths in the height direction of the portions where the plurality of rectifying fins 72 overlap with the opening 41f (hereinafter, overlapping portions) differ among the rectifying fins 72. More specifically, the further the rectifying fin 72 is from the opening 41f in the arrangement direction, the longer the overlapping portion in the height direction. In other words, the further the plurality of rectifying fins 72 is from the inflow channel 42 in the arrangement direction, the larger the area of ​​the overlapping portion when viewed from the arrangement direction (see FIGS. 5(a) and 5(b)). In other words, the more the rectifying fins 72 are farther from the inflow channel 42 in the arrangement direction, the closer they are to the bottom surface 41a in the height direction. The length in the height direction of the overlapping portion between the rectifying fin 72 (rectifying fin 72L) closest to the opening 41f in the arrangement direction and the opening 41f is the shortest. The length in the height direction of the overlapping portion between the rectifying fin 72 (rectifying fin 72R) farthest from the opening 41f in the arrangement direction and the opening 41f is the longest.

[0047] It is preferable that the positions of the ends of the multiple rectifying fins 72 on the other side (the side closer to the multiple nozzles 66) in the height direction are approximately the same (see FIG. 4). That is, it is preferable that the ends of the multiple rectifying fins 72 on the other side in the height direction are arranged side by side along the arrangement direction. In other words, the end on the other side in the height direction of a flow path formed between two rectifying fins 72 adjacent to each other in the arrangement direction (or between the inner surface 41b and the rectifying fin 72L or between the inner surface 41c and the rectifying fin 72R) is defined as an outlet 73 (see FIG. 4). In this case, it is preferable that the positions of the multiple outlets 73 in the height direction are approximately the same.

[0048] In the supply flow path 70, an area where the rectifying fins 72 are arranged will be referred to as a rectifying area RA (see FIGS. 4, 5(a), and 5(b)). Specifically, the rectifying area RA is an area where the rectifying fins 72 are arranged when viewed from the arrangement direction (see FIGS. 5(a) and 5(b)). More specifically, when viewed from the yarn running direction, an imaginary line passing through one end of the rectifying fin 72R in the height direction and parallel to the arrangement direction is defined as a line 102 (see FIG. 4). Furthermore, when viewed from the yarn running direction, an imaginary line passing through the other ends of the plurality of rectifying fins 72 in the height direction and parallel to the arrangement direction is defined as a line 103 (see FIG. 4). In this case, when viewed from the yarn running direction, the area surrounded by the lines 102 and 103, the inner surface 41c, the inner surface 41b, and an imaginary extension plane extending to one side in the height direction of the inner surface 41b is the rectifying area RA.

[0049] The flow rectification area RA is preferably disposed so as to protrude toward both the curved flow path 43 and the chamber 71. In other words, in the height direction, the other ends of the multiple flow rectification fins 72 preferably protrude to some extent toward the other side in the height direction than the curved flow path 43 (i.e., into the chamber 71). In this case, the flow rectification area RA has a first flow rectification area RA1 on the curved flow path 43 side (one side in the height direction from the straight line 101 described above) and a second flow rectification area RA2 on the chamber 71 side (the other side in the height direction from the straight line 101).

[0050] Generally, when high-pressure compressed air is supplied, a large amount of compressed air tends to reach the end of the curved flow path 43 farther from the inlet channel 42 in the extension direction of the inlet channel 42 (the arrangement direction in this embodiment). Conversely, the compressed air tends to simply pass through the space of the curved flow path 43 closer to the inlet channel 42 in the extension direction. For this reason, it may be relatively difficult for compressed air to be supplied to the space closer to the inlet channel 42 in the extension direction. Therefore, there is a risk that the flow velocity of the compressed air may be more likely to vary among the multiple nozzles 66 in the arrangement direction. In this regard, as described above, in this embodiment, multiple rectifying fins 72 are provided in at least the curved flow path 43. This makes it possible to prevent a large amount of compressed air from reaching the end of the curved flow path 43 farther from the inlet channel 42 in the extension direction. Furthermore, in this embodiment, the area of ​​the portion of the multiple rectifying fins 72 that overlaps with the opening 41f when viewed from the extension direction increases as the rectifying fins 72 are farther from the inlet channel 42 in the extension direction (see FIGS. 5(a) and 5(b)). This allows the compressed air to be received little by little by each straightening fin 72. Therefore, the compressed air can be distributed approximately evenly in the arrangement direction within the curved flow path 43. The compressed air distributed approximately evenly in this manner is sent to the chamber 71. Furthermore, in this embodiment, the distance in the height direction between the multiple outlets 73 and the multiple nozzles 66 does not change depending on the position in the arrangement direction but is approximately constant. Therefore, compared to a case where the distance varies depending on the position in the arrangement direction, for example, it is possible to avoid the risk that the flow velocity variation reduced in the arrangement direction by the straightening fins 72 will increase again downstream in the flow direction.

[0051] (Chamber) Next, the structure of the chamber 71 will be described. The chamber 71 is a space for allowing the compressed air, which has been rectified by the multiple rectifying fins 72, to flow smoothly to the other side in the height direction. The chamber 71 is composed of, for example, the chamber-forming flow path 44, the connecting flow path 45, and the main flow path 61, as described above. The chamber 71 has the second flow rectification area RA2 (the area in which the other side portion in the height direction of the flow rectification fins 72 is arranged) and a downstream area DA arranged on the other side in the height direction of the second flow rectification area RA2. The length of the entire chamber 71 in the height direction is, for example, L. The length of the second flow rectification area RA2 in the height direction is, for example, Lr2. The length of the downstream area DA in the height direction is, for example, Ld.

[0052] Further, the downstream area DA has, for example, a first downstream area DA1 and a second downstream area DA2 (see FIGS. 4 and 5(a)). The first downstream area DA1 is a roughly rectangular parallelepiped area located on the other side in the height direction of the second flow straightening area RA2. The first downstream area DA1 is configured, for example, by an area of ​​the chamber-forming flow path 44 where the flow straightening fins 72 are not arranged (an area on the other side in the height direction of the straight line 103), the connecting flow path 45, and the first main pipe flow path 61a. No components are arranged in the first downstream area DA1. The second downstream area DA2 is a roughly rectangular parallelepiped area located on the other side in the height direction of the first downstream area DA1. The second downstream area DA2 is configured, for example, by the second main pipe flow path 61b. No components are arranged in the second downstream area DA2. As shown in FIG. 5(a), the length of the second downstream area DA2 in the yarn running direction is shorter than the length of the first downstream area DA1 in the yarn running direction. In other words, the second downstream region DA2 is narrower in the yarn traveling direction than the first downstream region DA1. In this embodiment, the above-described main channel 61 includes a portion of the first downstream region DA1 in the height direction and the second downstream region DA2. That is, the main channel 61 includes a first main channel 61a that constitutes a portion of the first downstream region DA1 and a second main channel 61b that constitutes the second downstream region DA2 (see FIGS. 4 and 5(a)). As a result, in the main channel 61 (chamber 71), the cross-sectional area of ​​the channel gradually decreases toward the downstream side in the flow direction. Generally, for a given fluid flow rate, the flow velocity is relatively slow where the cross-sectional area of ​​the channel is large and relatively fast where the cross-sectional area is small. Therefore, the flow velocity of the fluid can be gradually increased. This prevents the flow velocity from suddenly increasing near the nozzle 66. This prevents the flow of the fluid from being turbulent near the nozzle 66.

[0053] Here, the inventors of the present application focused on whether the height lengths of various regions of the chamber 71 could affect the flow straightening effect. For example, as shown in FIG. 4, the height length of the entire chamber 71 is defined as L. The height length of the downstream region DA is defined as Ld. The height length of the first downstream region DA1 is defined as Ld1. The height length of the second downstream region DA2 is defined as Ld2. The height length of the second flow straightening region RA2 is defined as Lr2. The inventors investigated how the flow velocity of the compressed air and the flow velocity variation among the multiple nozzles 66 change when at least one of these conditions (L, Ld, Ld1, Ld2, and Lr2) is changed. The inventors of the present application found, through fluid analysis described below, that these conditions affect the flow velocity and flow velocity variation.

[0054] (Analysis conditions) The fluid analysis performed by the inventors of the present invention will be described with reference to the tables in FIGS. 8 to 11. First, the common conditions for Examples 1 to 9 and Comparative Examples 1 and 2 shown in FIG. 8 are as follows: The type of fluid was assumed to be air (compressed air). The pressure of the compressed air was assumed to be 0.35 MPa. The inner diameter of the inlet channel 42 (the diameter of the opening 41f) was assumed to be 25 mm. The diameter of the opening 41f was assumed to be equal to the length of the curved channel 43 in the height direction. The length of the curved channel 43 and the chamber 71 in the arrangement direction (the distance in the arrangement direction from the inner surface 41b to the inner surface 41c) was assumed to be 130 mm. The length of the first downstream area DA1 in the yarn running direction was assumed to be 28 mm. The length of the second downstream area DA2 in the yarn running direction was assumed to be 10 mm. The number of rectifying fins 72 was assumed to be 11. The rectifying fins 72 were arranged at equal intervals in the arrangement direction. The protrusion length of the flow straightening fin 72L from the straight line 101 to one side in the height direction was assumed to be 3 mm. The protrusion length of the flow straightening fin 72R from the straight line 101 to one side in the height direction was assumed to be 24 mm. In other words, when the height direction length of the flow straightening area RA is Lr (see FIG. 4), the value of Lr is Lr2 + 24 mm. The protrusion length was assumed to be linearly larger for the flow straightening fin 72 located on the other side in the arrangement direction. The nozzles 66 were assumed to extend parallel to the height direction. The number of nozzles 66 was assumed to be 32. Note that the above common conditions are merely set for convenience as an example for analyzing the dependency of the compressed air flow velocity and the flow velocity variation between the nozzles 66 on the length of the chamber 71 in the height direction. In other words, it should be noted that even if the above common conditions are slightly changed, qualitatively similar analysis results are expected to be obtained.

[0055] Next, details of the analysis conditions and the analysis results will be described with reference to Figs. 8 to 11. Figs. 8 to 11 are tables showing details of the analysis conditions and the analysis results. Fig. 8 shows the analysis conditions and analysis results for all examples (Examples 1 to 9) and comparative examples (Comparative Examples 1 and 2). Figs. 9(a) to 11 show examples and comparative examples classified by type of condition setting. In Figs. 9(a) to 11, parameters whose conditions have been changed are surrounded by a thick frame.

[0056] 8 to 11 show, as specific conditions, the presence or absence of the rectifying fins 72, L, Ld, Ld1, Ld2, Lr2, and Lr. The sum of Ld and Lr2 is L. The sum of Ld1 and Ld2 is Ld. Note that in Comparative Examples 1 and 2, the rectifying fins 72 are not provided, so only L and Ld2 can be defined among L, Ld, Ld1, Ld2, Lr2, and Lr. Therefore, the values ​​of Ld, Ld1, Lr2, and Lr are not shown for Comparative Examples 1 and 2 (see FIGS. 8 and 9(a)). Furthermore, as analysis results, the average flow velocity at the position of each tip of the 32 nozzles 66 and the flow velocity variation among the 32 nozzles 66 are shown. The average flow velocity is the average value (unit: m / s) of the flow velocity of the compressed air at the above-mentioned 32 locations. The flow rate variation is a coefficient of variation (unit: %) obtained by dividing the standard deviation of the flow rates at the 32 locations described above by the average flow rate. It is expected that the larger the average flow rate, the more easily the yarn Y will be entangled. It is expected that the smaller the flow rate variation, the more uniform the ease with which the yarns Y will be entangled.

[0057] (Depends on whether or not fins are present) First, as shown in FIG. 9( a), the average flow velocity and the flow velocity variation were compared between cases where the flow straightening fins 72 were provided in the supply flow path 70 (Examples 1 and 6) and cases where they were not provided (Comparative Examples 1 and 2). Here, the average flow velocity and the flow velocity variation were compared between examples where L and Ld2 were equal. That is, the average flow velocity and the flow velocity variation were compared between Example 1 and Comparative Example 1, and the average flow velocity and the flow velocity variation were compared between Example 6 and Comparative Example 2. In both cases, the average flow velocity was higher and the flow velocity variation was smaller when the flow straightening fins 72 were provided than when the flow straightening fins 72 were not provided. Specifically, the average flow velocity and the flow velocity variation in Comparative Example 1 were 369.1 m / s and 0.43%, respectively, and the average flow velocity and the flow velocity variation in Example 1 were 371.7 m / s and 0.26%, respectively. The average flow velocity and flow velocity variation in Comparative Example 2 were 379.8 m / s and 0.62%, respectively, and the average flow velocity and flow velocity variation in Example 6 were 382.5 m / s and 0.10%. Therefore, the analysis results showed that the flow straightening fins 72 provided a good flow straightening effect.

[0058] (Ld1 dependence, Ld2 dependence) The present inventors further confirmed whether better effects could be obtained by changing the height of the chamber 71. As shown in FIG. 9(b), the inventors changed the height of the first downstream region DA1 (Ld1) in the range of 10 to 1,087 mm (Examples 1 to 4). Ld was also changed in accordance with the change in Ld1. It was confirmed that as Ld1 increased, the average flow velocity increased and the flow velocity variation decreased, at least until Ld1 reached 587 mm (Example 3). Meanwhile, no significant difference was observed between the case where Ld1 was 587 mm (Example 3) and the case where Ld1 was 1,087 mm (Example 4). Therefore, from the viewpoint of avoiding an increase in the size of the device, it is preferable that Ld1 be approximately 600 mm or less. In addition, since Ld2 was not necessarily uniform in Examples 1 to 4 (Ld2 was 9 mm in Example 1, and Ld2 was 14 mm in Examples 2 to 4), the inventors of the present application also evaluated whether or not differences in Ld2 had any effect on flow velocity variations, as described below.

[0059] As shown in FIG. 10(a), the inventors varied the height direction length (Ld2) of the second downstream region DA2 within a range of 9 to 91 mm (Examples 1, 5, 6, 7). Ld was also varied in accordance with the change in Ld2. In Examples 1, 5, 6, 7, and 7, Ld1 was uniformly set to 10 mm. Analysis results showed that as Ld2 increased, the average flow velocity increased and / or the flow velocity variation decreased. For example, comparing Example 1 (Ld2 was 9 mm) and Example 5 (Ld2 was 27 mm), the flow velocity variation was similar at 0.26%. Meanwhile, the average flow velocity was 371.7 m / s in Example 1, but increased to 378.7 m / s in Example 5. Furthermore, when Ld2 was 46 mm or longer (Examples 6, 7), the flow velocity variation was significantly reduced (to 0.10% or less).

[0060] In addition, in the above-mentioned Examples 2 to 4 used in the analysis of the Ld1 dependency of the flow velocity variation, etc., Ld2 is 14 mm. 14 mm is the value between Example 1 (Ld2 is 9 mm) and Example 5 (Ld2 is 27 mm). Since no difference in the flow velocity variation was observed between Example 1 and Example 5, it is considered that the difference in Ld2 does not affect the difference in the flow velocity variation between Example 1 and Examples 2 to 4. In other words, it can be considered that the difference in the flow velocity variation in Examples 1 to 4 was simply caused by the difference in Ld1.

[0061] In addition, when the flow straightening fins 72 were not provided (Comparative Examples 1 and 2), the analysis result showed that the flow velocity variation was not reduced even when Ld2 was increased, but rather increased (see FIG. 9(a)). In other words, it was found that the effect of reducing the flow velocity variation by increasing Ld2 (Ld) is only possible if the flow straightening fins 72 are provided.

[0062] As described above, the analysis results show that providing the straightening fins 72 and lengthening Ld1 and / or Ld2 to increase the downstream area DA in the height direction increases the average flow velocity and reduces the flow velocity variation. The inventors of the present application considered this result as follows: The compressed air molecules, whose flow velocity variation has been reduced to a certain extent by the straightening fins 72, flow approximately uniformly in the height direction through the downstream area DA of the chamber 71 while colliding with each other in the arrangement direction. As a result, the variation in the velocity component of the compressed air molecules in the arrangement direction gradually decreases, and the molecules are encouraged to move approximately straight along the height direction. This makes the velocity component in the height direction more uniform in the arrangement direction. This effect becomes more pronounced as the downstream area DA (i.e., the area where nothing is placed) becomes longer in the height direction. For the reasons described above, the inventors of the present application speculated that increasing the downstream area DA would increase the average flow velocity and / or reduce the flow velocity variation. As described above, in the comparative example, when the chamber 71 was lengthened (comparative example 2), the flow velocity variation was not reduced, but rather increased. Considering this result, the inventors of the present application thought that the above effect was only possible on the premise that the compressed air was rectified to some extent by the rectifying fins 72.

[0063] The present inventors also obtained analytical results (Examples 2 and 7) when L was set equal and Ld1 and Ld2 were set as shown in FIG. 10(b). By making Ld2 longer than Ld1, the flow velocity variation was significantly reduced. The present inventors considered the reason for this as follows: When fluid moves from the first downstream region DA1, which has a large cross-sectional area, to the second downstream region DA2, which has a relatively small cross-sectional area, a large amount of compressed air may enter the relatively narrow flow path, causing some turbulence in the airflow. Therefore, the present inventors considered that by lengthening the second downstream region DA2 in the height direction, the compressed air can flow downstream in the flow direction while effectively alleviating airflow turbulence, thereby reducing flow velocity variation.

[0064] Furthermore, the inventors of the present invention obtained analytical results when varying Lr2 while keeping L constant, as shown in FIG. 11 (Examples 2, 8, and 9). As a result, even if Lr2 was increased, the effect of reducing flow velocity variation was not obtained. In Examples 8 and 9, the length (Lr) of the flow straightening area RA in the height direction was increased, and the length (Ld) of the downstream area DA in the height direction was shortened accordingly. Therefore, it is believed that the effect of shortening Ld was also significant in Examples 8 and 9.

[0065] From the above viewpoints, it is preferable that the length (Ld) in the height direction of the downstream area DA where nothing is arranged in the chamber 71 is long. For example, if the length (Ld) of the downstream area DA is longer than the length (Lr) of the flow straightening area RA where the flow straightening fins 72 are arranged, the effect of further increasing the average flow velocity and / or further reducing the flow velocity variation can be obtained. Furthermore, considering Examples 2 to 4, 6, and 7, it was found that when Ld is about twice or more of Lr, the flow velocity variation is further significantly reduced (flow velocity variation is smaller than 0.2%).

[0066] As described above, the compressed air that has flowed into the supply flow path 70 flows in the inlet path 42 in at least the arrangement direction, and then, in the curved flow path 43, its flow direction is changed from the arrangement direction to a direction having at least a height component. At this time, the rectifying fins 72 can receive a portion of the compressed air flowing in the extension direction of the inlet path 42. This allows the curved flow path 43 to rectify the compressed air while preventing a large amount of compressed air from flowing into a space farther from the inlet path 42. Therefore, the flow velocity of the compressed air flowing within the chamber 71 can be made more uniform in the arrangement direction than in a case where the rectifying fins 72 are not provided. This reduces variation in flow velocity among the multiple nozzles 66.

[0067] Furthermore, the area of ​​the portion of the rectifying fins 72 that overlaps with the opening 41f when viewed from the extension direction increases as the rectifying fins 72 are further from the inlet channel 42 in the arrangement direction. This effectively prevents a large amount of compressed air from reaching the end of the curved flow channel 43 that is farther from the opening 41f in the extension direction. Furthermore, in this embodiment, the compressed air can be received little by little by each rectifying fin 72. This allows the compressed air to be distributed approximately evenly in the extension direction (arrangement direction) within the curved flow channel 43. This effectively reduces the variation in flow velocity in the arrangement direction of the compressed air supplied to the chamber 71 through the curved flow channel 43.

[0068] Furthermore, the ends of the plurality of rectifying fins 72 that are closer to the plurality of nozzles 66 in the height direction are aligned along the arrangement direction. This allows the distance in the height direction from the plurality of outlets 73 to the plurality of nozzles 66 to be kept substantially constant without varying depending on the position in the arrangement direction. Therefore, compared to a case where the distance varies depending on the position in the arrangement direction, for example, it is possible to reduce the risk that the flow velocity variation reduced in the arrangement direction by the rectifying fins 72 will increase again within the chamber 71.

[0069] Furthermore, it is preferable that the downstream area DA is longer in the height direction than the straightening area RA. This allows the compressed air, after being straightened by the straightening fins 72, to travel a long distance in the height direction before reaching the multiple nozzles 66. As a result, adjacent molecules of the compressed air, after being straightened by the straightening fins 72, collide with each other, and are urged to travel generally straight along the height direction. This makes it possible to further effectively reduce the variation in flow velocity among the multiple nozzles 66.

[0070] Furthermore, the inventors of the present application have found that when the length in the height direction of the downstream area DA is at least twice the length in the height direction of the flow straightening area RA, the flow velocity variation is reduced significantly.

[0071] The chamber 71 also has a first downstream region DA1 and a second downstream region DA2, the length of which in the yarn traveling direction is shorter than the length of the first downstream region DA1 in the yarn traveling direction. That is, the cross-sectional area of ​​the flow path in the second downstream region DA2 is smaller than the cross-sectional area of ​​the flow path in the first downstream region DA1. That is, in the chamber 71, the cross-sectional area of ​​the flow path can be gradually reduced toward the downstream side in the flow direction. This allows the flow velocity of the compressed air to be gradually increased. This prevents the flow velocity from increasing suddenly near the nozzle 66. This prevents the flow of compressed air from being disturbed near the nozzle 66.

[0072] It is even more preferable that the second downstream region DA2 be longer in the height direction than the first downstream region DA1. That is, when the fluid moves from the first downstream region DA1, which has a large cross-sectional area, to the second downstream region DA2, which has a relatively small cross-sectional area, a large amount of compressed air may enter the relatively narrow flow path, causing some turbulence in the airflow. Therefore, by lengthening the second downstream region DA2 in the height direction, the turbulence in the airflow can be effectively alleviated while the compressed air flows downstream in the flow direction, thereby reducing flow velocity variation.

[0073] Furthermore, in this embodiment, it is possible to reduce variations in the efficiency of entangling by the entangling device 13 among the multiple yarns Y. Therefore, it is possible to reduce variations in quality among the multiple packages P simultaneously formed by the yarn take-up machine 1.

[0074] Next, a modified example of the embodiment will be described, with the same reference numerals being used to designate components having the same configuration as the embodiment, and the description thereof will be omitted as appropriate.

[0075] (1) In the above embodiment, the length of the first downstream region DA1 of the chamber 71 in the yarn traveling direction is constant. However, this is not limited to this. For example, the length of the chamber-forming flow path 44 in the yarn traveling direction and the length of the connecting flow path 45 in the yarn traveling direction may be different from each other. For example, the connecting flow path 45 may be shorter (i.e., narrower) than the chamber-forming flow path 44 in the yarn traveling direction. In this case, it can be said that the chamber-forming flow path 44 corresponds to the first downstream region of the present invention, and the connecting flow path 45 corresponds to the second downstream region of the present invention.

[0076] (2) In the above-described embodiments, the downstream area DA of the chamber 71 includes the first downstream area DA1 and the second downstream area DA2. However, this is not limited to this. The downstream area DA may include only one of the first downstream area DA1 and the second downstream area DA2.

[0077] (3) In the above-described embodiments, it is preferable that the downstream area DA is longer than the flow straightening area RA in the height direction. However, even if the downstream area DA has a length equal to or shorter than the flow straightening area RA in the height direction, the flow straightening effect can be obtained by providing the flow straightening fins 72.

[0078] (4) In the above-described embodiment, the ends of the other sides in the height direction of the plurality of rectifying fins 72 are arranged side by side along the arrangement direction. However, this is not limited to this. The positions of the ends of the other sides in the height direction of the plurality of rectifying fins 72 may be different from each other in the height direction.

[0079] (5) In the above-described embodiments, the multiple rectifying fins 72 that are farther from the inflow channel 42 in the arrangement direction have a larger area of ​​their overlapping portions with the inflow channel 42 when viewed in the arrangement direction. However, this is not limited to this. For example, the protrusion lengths of the multiple rectifying fins 72 to one side in the height direction may be approximately equal among the multiple rectifying fins 72.

[0080] (6) In the above-described embodiment, the curved flow path 43 is provided with a plurality of rectifying fins 72. However, this is not limited to this. For example, depending on the length of the curved flow path 43 in the arrangement direction, only one rectifying fin 72 may be provided.

[0081] (7) In the above-described embodiments, the supply flow path 70 is configured by the fluid supply member 31, the connecting member 32, and the base member 51 of the entanglement unit 33. However, this is not limited to this. For example, the fluid supply member 31 and the connecting member 32 may be integrally formed as a single member, for example, by welding. Alternatively, the entanglement device 13 may not have the connecting member 32. In this case, the main body 41 of the fluid supply member 31 and the base member 51 of the entanglement unit 33 may be screwed together.

[0082] (8) The side surfaces (e.g., inner side surfaces 41b to 41e) that form the chamber 71 do not necessarily need to extend substantially parallel to the height direction. These side surfaces may, for example, be inclined relative to the height direction. As a result, for example, the cross-sectional area of ​​the downstream region DA perpendicular to the height direction may become smaller toward the other side in the height direction. Conversely, the cross-sectional area may become larger toward the other side in the height direction.

[0083] (9) In the above embodiments, the arrangement direction and the height direction are substantially perpendicular to each other. However, this is not limited to this. The arrangement direction and the height direction do not necessarily have to be substantially perpendicular to each other. Furthermore, although the extension direction of the inflow channels 42 is substantially parallel to the arrangement direction, this is not limited to this. The extension direction may be inclined relative to the arrangement direction.

[0084] (10) The interlacing device 13 may be applied to a textile machine other than the yarn take-up machine 1 that handles the traveling yarn Y. [Explanation of symbols]

[0085] 1. Yarn take-up machine (yarn winding machine) 13 Interlacing device 41f opening (entrance) 42 Inflow channel 43 Bent Channel 66 nozzles 70 Supply channel 71 Chamber 72 Straightening fin DA downstream area DA1 1st downstream area DA2 2nd downstream region P Package RA rectification area Y thread

Claims

1. An intertwining device that entangles a plurality of yarns with a fluid, a plurality of nozzles arranged in a first direction perpendicular to a yarn running direction in which the plurality of yarns run, for spraying the fluid onto each of the plurality of yarns; a supply channel configured to supply the fluid to the plurality of nozzles; The supply flow path is an inlet channel extending at least in the first direction and through which the fluid flows; a chamber disposed between the inlet channel and the plurality of nozzles in the fluid flow direction, extending in the first direction and also extending in a second direction intersecting the yarn running direction and intersecting the first direction; a bent flow path disposed between the inlet channel and the chamber in the flow direction, the bent flow path being bent from the first direction toward the second direction, At least the tortuous flow path has An intertwining device characterized in that one or more straightening fins are provided which are arranged to extend in the second direction and are arranged so as to at least partially overlap with the inlet of the curved flow path when viewed from the extension direction of the inlet path.

2. The one or more rectifying fins include a plurality of rectifying fins arranged side by side in the first direction, The interlacing device according to claim 1, wherein the area of ​​the portion of the plurality of flow straightening fins that overlaps with the inlet when viewed from the extension direction increases as the fins are further from the inlet channel in the first direction.

3. The one or more rectifying fins include a plurality of rectifying fins arranged side by side in the first direction, 3. The interlacing device according to claim 1, wherein ends of the plurality of flow straightening fins that are closer to the plurality of nozzles in the second direction are arranged side by side along the first direction.

4. The chamber comprises: a downstream region that is disposed closer to the plurality of nozzles in the second direction than a flow straightening region that is a region in which the one or more flow straightening fins are disposed, 4. The interlacing device according to claim 1, wherein the downstream region is longer than the straightening region in the second direction.

5. 5. The intertwining device according to claim 4, wherein the length of the downstream region in the second direction is at least twice the length of the flow straightening region.

6. The chamber comprises: a first downstream region disposed downstream in the flow direction of a flow straightening region, which is a region in which the one or more flow straightening fins are disposed; A second downstream region is disposed downstream in the flow direction of the first downstream region, and has a length in a third direction perpendicular to both the first direction and the second direction, which is shorter than the length of the first downstream region in the third direction.

7. The interlacing device according to claim 6 , wherein the second downstream region is longer than the first downstream region in the second direction.

8. An interlacing device according to any one of claims 1 to 7, a winding section that winds the plurality of yarns that have been entangled by the entangling device to simultaneously form a plurality of packages.

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