Yarn winding device and yarn catching nozzle

Abstract

A yarn winding device and a yarn catching nozzle are provided. The yarn winding device (3) has a yarn catching nozzle (40) that guides a yarn caught by suction to a yarn receiving device. The yarn catching nozzle has a tube portion (41) provided so that one end portion is rotatable about a rotation axis and extends toward the other end portion, a yarn suction portion (42) that, when the extending direction of the tube portion is taken as a first direction, is formed with an opening (42A) that is wide in a second direction that is substantially orthogonal to the first direction and that suctions outside air by a supplied negative pressure and suctions a yarn in a third direction that is substantially orthogonal to both the first direction and the second direction from the opening, and a linking portion (43) that extends in the second direction and links the tube portion and the yarn suction portion. When the linking portion is viewed from the first direction, the linking portion is formed so that both of a pair of outer profiles opposite in the third direction bulge outward in a circular arc shape.

Description

Technical Field

[0001] One aspect of the present invention relates to a yarn winding device and a yarn capturing nozzle. Background Technology

[0002] An automatic winding machine is known that simultaneously adjusts the quality of worsted yarn while winding yarn from multiple worsted yarn bobbins into a package. In the winding device of such an automatic winding machine, for example, after the yarn on the supply side is exhausted or a defect is detected and removed from the yarn, a yarn splicing device is needed to connect the yarn on the supply side to the yarn on the winding side. Patent Document 1 (International Publication No. 2008 / 022676) discloses a method for guiding the broken yarn on the package side to the suction nozzle of the yarn splicing device when the yarn breaks as described above. Summary of the Invention

[0003] A suction nozzle different from the shape described above is known. This suction nozzle has: a tube extending in a first direction, with one end rotatable about a rotation axis; a yarn-attracting section that, using a supplied negative pressure, draws yarn upward from a wide opening in a second direction substantially orthogonal to the first and second directions; and a connecting section extending in the second direction connecting the tube and the yarn-attracting section. In such a suction nozzle, smooth airflow is desired to improve suction performance.

[0004] Therefore, one aspect of the present invention is to provide a yarn winding device and a yarn capturing nozzle that enable the suction air drawn from the opening to flow smoothly in the suction direction.

[0005] One aspect of the yarn winding apparatus of the present invention includes: a yarn feeding section; a winding section that winds the yarn from the yarn feeding section into a package; a yarn splicing device that connects the yarn on the yarn feeding section side to the yarn on the winding section side when the yarn breaks between the yarn feeding section and the winding section; and a yarn capturing nozzle that draws and captures the broken yarn on the winding section side from the package and guides the captured yarn to the yarn splicing device. The yarn capturing nozzle has: a tube portion, one end of which is rotatable about a rotation axis, and the tube portion facing the other end. The tube extends into a portion; a yarn-attracting portion, which, when the extension direction of the tube is set as a first direction, has an opening that is wide in a second direction substantially orthogonal to the first direction and attracts yarn upward from the opening in a third direction substantially orthogonal to both the first and second directions; and a connecting portion, which extends in the second direction and connects the tube to the yarn-attracting portion, wherein, when viewed from the first direction, the connecting portion is formed such that two opposing outer contours bulge outward in an arc shape in a third direction.

[0006] In the past, such suction nozzles were designed to minimize energy loss by minimizing the flow of the suction air. However, in yarn-catching nozzles like this one, where the suction air flow bends approximately 90 degrees in a second direction from a third direction and further bends approximately 90 degrees in a first direction from the second direction, the inventors found that such a design concept was not very helpful in reducing energy loss. Therefore, in the yarn winding device of the present invention, when the connecting portion is viewed from the first direction, it is formed such that both outer contours facing each other in the third direction bulge outward in an arc shape. As a result, the flow path of the suction air formed inside the connecting portion can also be formed along the aforementioned outer contour. Since the flow path of the suction air formed along such an outer contour guides the suction air smoothly downstream, the suction air drawn from the opening can flow smoothly in the suction direction.

[0007] In one aspect of the yarn winding apparatus of the present invention, an outer contour in which the third-direction upward direction is opposite to the opening side may protrude in the third-direction upward direction from the connection between the tube portion and the yarn attraction portion. Since the flow path of the attraction air formed along such an outer contour guides the attraction air more gently downstream, the attraction air attracted from the opening can flow smoothly in the attraction direction.

[0008] In one aspect of the yarn winding apparatus of the present invention, the air intake path when the connecting portion is cut with a plane orthogonal to the first direction may be formed such that a pair of inner walls facing each other in a third direction bulge out in an arc shape. Since the air intake path formed by the inner walls in this way guides the air intake gently downstream, the air intake drawn from the opening can flow smoothly in the intake direction.

[0009] In one aspect of the yarn winding apparatus of the present invention, the inner wall of one of the pair of inner walls, which is opposite to the opening side in the third direction, may protrude to the opposite side in the third direction from the air suction flow path at the connection between the tube and the yarn suction section. Since the air suction flow path formed by the inner wall in this way guides the suction air more gently downstream, the suction air drawn from the opening can flow smoothly in the suction direction.

[0010] In one aspect of the yarn winding apparatus of the present invention, a first flow path direction changing section may be formed in the connecting portion leading to the yarn attraction section in the connecting portion, wherein the orientation of the air attraction flow path changes from a third direction to a second direction. In the air attraction direction, the ratio of the cross-sectional area of ​​the air attraction flow path at the downstream end of the first flow path direction changing section to the cross-sectional area of ​​the air attraction flow path at the upstream end of the first flow path direction changing section is 0.9 or more and less than 1.1. In this structure, if the ratio of the change in cross-sectional area is small, then when the attraction force (negative pressure) from the negative pressure source is fixed, the ratio of the change in flow rate and flow velocity also becomes smaller. Therefore, since the ratio of the change in airflow within the flow path is smaller, the reduction in attraction efficiency can be suppressed.

[0011] In one aspect of the yarn winding apparatus of the present invention, the connecting portion leading to the yarn attraction portion in the connecting portion may have a first flow path direction changing portion, where the orientation of the air attraction flow path changes from a third direction to a second direction, and the rate of change of the cross-sectional area of ​​the air attraction flow path in the first flow path direction changing portion is less than 10%. In this structure, if the rate of change of the cross-sectional area is small, then when the attraction force (negative pressure) from the negative pressure source is fixed, the rate of change of the flow rate and the flow velocity also becomes smaller. Therefore, since the rate of change of the airflow in the flow path is smaller, the reduction in attraction efficiency can be suppressed.

[0012] In one aspect of the yarn winding apparatus of the present invention, a second flow path direction changing section may be formed in the connecting portion leading to the tube in the connecting portion, wherein the orientation of the air suction flow path changes from a second direction to a first direction. In the air suction direction, the ratio of the cross-sectional area of ​​the air suction flow path at the downstream end of the second flow path direction changing section to the cross-sectional area of ​​the air suction flow path at the upstream end of the second flow path direction changing section is 0.9 or more and less than 1.1. In this structure, if the ratio of the change in cross-sectional area is small, the ratio of the change in flow rate and flow velocity is also small when the suction force (negative pressure) from the negative pressure source is fixed. Therefore, since the ratio of the change in airflow within the flow path is small, the reduction in suction efficiency can be suppressed.

[0013] In one aspect of the yarn winding apparatus of the present invention, a second flow path direction changing section may be formed in the connecting portion leading to the tube in the connecting portion, wherein the orientation of the air suction flow path changes from the second direction to the first direction, and the rate of change of the cross-sectional area of ​​the air suction flow path in the second flow path direction changing section is less than 10%. In this structure, if the rate of change of the cross-sectional area is small, then when the suction force (negative pressure) from the negative pressure source is fixed, the rate of change of the flow rate and the flow velocity also becomes smaller. As a result, since the rate of change of the air flow in the flow path is smaller, the reduction in suction efficiency can be suppressed.

[0014] A yarn-catching nozzle of one aspect of the present invention is used in a yarn winding apparatus comprising: a yarn feeding section; a winding section that winds the yarn from the yarn feeding section into a package; and a yarn-receiving device that, in the event that the yarn breaks between the yarn feeding section and the winding section, connects the yarn on the yarn feeding section side to the yarn on the winding section side. The yarn-catching nozzle draws and catches the broken yarn on the winding section side from the package and guides the drawn and caught yarn to the yarn-receiving device. The yarn-catching nozzle has: a tube extending in a first direction, provided with... The tube has one end that can rotate about a rotation axis; a yarn suction part that draws in external air using a supplied negative pressure and has a wide opening in a second direction that is substantially orthogonal to the first direction, and draws in the yarn in a third direction that is substantially orthogonal to both the first and second directions; and a connecting part that extends in the second direction and connects the tube to the yarn suction part, wherein when viewed from the first direction, the connecting part is formed such that an outer pair of opposite contours in the third direction bulge outward in an arc shape.

[0015] In this structure, when viewed from the first direction, the connecting portion is formed such that one pair of opposite outer contours bulges outward in an arc shape in the third direction. Thus, the airflow path formed inside the connecting portion can also be formed along the aforementioned outer contour. Since the airflow path formed along such an outer contour gently guides the airflow downstream, the airflow drawn from the opening can flow smoothly in the suction direction.

[0016] In one aspect of the yarn-catching nozzle of the present invention, a first flow path direction changing section may be formed in the connecting portion leading to the yarn-attracting portion in the connecting portion, wherein the orientation of the air-attracting flow path changes from a third direction to a second direction, and the rate of change of the cross-sectional area of ​​the air-attracting flow path in the first flow path direction changing section is less than 10%. In this structure, if the proportion of change in cross-sectional area is small, then when the attraction force (negative pressure) from the negative pressure source is fixed, the proportion of change in flow rate and flow velocity is also small. Therefore, since the proportion of change in airflow within the flow path is small, the reduction in attraction efficiency can be suppressed.

[0017] In one aspect of the yarn-catching nozzle of the present invention, a second flow path direction changing section may be formed in the connecting portion leading to the tube in the connecting part, where the orientation of the air suction flow path changes from a second direction to a first direction, and the rate of change of the cross-sectional area of ​​the air suction flow path in the second flow path direction changing section is less than 10%. In this structure, if the rate of change of the cross-sectional area is small, then when the suction force (negative pressure) from the negative pressure source is fixed, the rate of change of the flow rate and the flow velocity also becomes smaller. As a result, since the rate of change of the airflow in the flow path is smaller, the reduction in suction efficiency can be suppressed. Invention Effects

[0018] According to one aspect of the invention, the suction air drawn from the opening can flow smoothly in the suction direction. Attached Figure Description

[0019] Figure 1 This is a front view of an automatic winding machine according to one embodiment. Figure 2 It means Figure 1 Side view of the winding unit. Figure 3 It means Figure 1 The front view of the winding unit. Figure 4 Viewed from an oblique angle Figure 1 A three-dimensional view of the winding-side capture section contained in the winding unit. Figure 5 Viewed from above Figure 4 A top view of the winding side capture section. Figure 6 Looking from the front Figure 4 Front view of the winding side capture section. Figure 7 (A) ~ Figure 7 (D) is from Figure 5 The cross-sectional views of the winding-side capture section observed along directions A to D are shown respectively. Figure 8 (E) ~ Figure 8 (G) is from Figure 5 Cross-sectional views of the winding-side capture section observed in the E~G directions respectively. Figure 9 (H)~ Figure 9 (K) is from Figure 6 Cross-sectional views of the winding-side capture section observed along the H~K directions. Figure 10 (L)~ Figure 10 (N) is from Figure 6 Cross-sectional views of the winding-side capture section observed along the L~N directions. Figure 11 (A) is a diagram showing the simulation results of the state of the suction flow in the winding-side capture section of this embodiment. Figure 11 (B) is a diagram showing the simulation results of the state of the suction flow in the previous (formed as a pair of opposite outer contours that do not bulge outward in an arc shape) winding side capture section. Explanation of reference numerals in the attached figures 1: Automatic winding machine (yarn handling device), 3: Winding unit (yarn winding device), 10: Unit control unit (control unit), 12: Yarn feeding device (yarn feeding part), 14: Winding device (winding part), 30: Yarn feeding side capture part, 30A: Suction port, 40: Winding side capture part (yarn capture nozzle), 41: Tube part, 42: Yarn suction part, 42A: Suction port (opening), 43: Connecting part, 43C: Connecting part, 43Wf: Inner wall (inner wall opposite to the opening side in the third direction), 43Wr: Inner wall, 44: First flow path direction changing part, 45: Second flow path direction changing part, 50: Machine control device, Y: Yarn. Detailed Implementation

[0020] The following is a reference to the appendix. Figure 1 The following describes one aspect of an embodiment of the present invention. It should be noted that in the description of the drawings, the same elements are labeled with the same reference numerals, and repeated descriptions are omitted.

[0021] like Figure 1 As shown, the automatic winding machine (yarn handling device) 1 includes multiple winding units (yarn winding devices) 3 arranged in a row, an end frame 5, and a doffing device 7. The multiple winding units 3 are arranged in a row (side by side) in one direction. Each winding unit 3 unwinds the yarn Y from the feed tube SB, while simultaneously winding the yarn Y onto the winding tube WB while moving the yarn Y laterally, thereby forming a package P.

[0022] An end frame 5 is positioned at one end of the direction in which the multiple winding units 3 are arranged. The end frame 5 is equipped with a machine control device 50, a display screen 52, and an input unit 54. The machine control device 50 centrally manages and controls all parts of the automatic winding machine 1. The display screen 52 can display information related to the settings and status of the winding units 3. The operator can perform setting operations on the winding units 3 by using the input unit 54. The machine control device 50 can communicate with each winding unit and doffing device 7 of the multiple winding units 3 via, for example, CAN (Controller Area Network). In other words, each winding unit and doffing device 7 of the multiple winding units 3 can communicate via the machine control device 50.

[0023] When the package P in each winding unit 3 becomes a full roll (with a specified amount of yarn wound on it), the doffing device 7 moves to the position of the winding unit 3, removes (removes) the full roll, and places an empty winding tube WB.

[0024] like Figure 2 and Figure 3As shown, the winding unit 3 includes a unit control unit (control unit) 10, a yarn feeding device (yarn feeding section) 12, and a winding device (winding section) 14. The unit control unit 10 includes, for example, a CPU (Central Processing Unit) and a ROM (Read-Only Memory). The ROM stores programs for controlling each structure of the winding unit 3. The CPU executes the programs stored in the ROM. Furthermore, various controls of the unit control unit 10 in this embodiment will be described in detail later.

[0025] The components constituting the winding unit 3 are fixed to the outer casing 8. The outer casing 8 is formed of a resin component, such as polypropylene mixed with glass fiber. The unit control unit 10 controls the operation of each component in the winding unit 3.

[0026] The yarn feeding device 12 supports the yarn feeding tube SB, which is mounted on a transport tray (not shown), at a predetermined position. The yarn feeding device 12 unwinds the yarn Y from the yarn feeding tube SB and leads the yarn Y out of the yarn feeding tube SB. The yarn feeding device 12 is configured to supply yarn Y. The yarn feeding device 12 is not limited to a transport tray type device; it can also be, for example, a yarn storage device.

[0027] The winding device 14 winds yarn Y onto a winding tube WB to form a package P. The winding device 14 includes a cradle 17 and a winding drum 18. The cradle 17 rotatably supports the winding tube WB (or package P) by clamping it. The winding drum 18 causes the yarn Y to traverse across the surface of the package P and rotates the package P. The winding drum 18 is driven to rotate by a drum drive motor 19. With the outer periphery of the package P in contact with the winding drum 18, the winding drum 18 is driven to rotate, thereby causing the package P to rotate passively. A helical traverse groove 14a is formed on the outer peripheral surface of the winding drum 18. The yarn Y, unwound from the feed tube SB, traverses across the traverse groove 14a with a fixed width while being wound onto the surface of the package P. Thus, a package P with a fixed width can be formed.

[0028] When the yarn package P is wound in the Y direction, the winding device 14 rotates the package P in the winding direction (the rotation in the winding direction is set to forward). The drum drive motor 19 of the winding device 14 drives the winding drum 18 to rotate based on the drive command from the unit control unit 10, so that the package P rotates at a predetermined winding speed.

[0029] Each winding unit 3, between the yarn feeding device 12 and the winding device 14 in the yarn travel direction Y, sequentially includes, starting from the yarn feeding device 12 side, an unwinding auxiliary device 20, a tension applying device 22, a tension detecting device 24, a yarn splicing device 26, and a yarn monitoring device 28. A yarn feeding side capturing part 30 and a winding side capturing part (yarn capturing nozzle) 40 are arranged near the yarn splicing device 26.

[0030] The unwinding auxiliary device 20 prevents the yarn Y unwound from the yarn feeding tube SB from swinging excessively due to centrifugal force, and properly unwinds the yarn Y from the yarn feeding tube SB.

[0031] The tension applying device 22 applies a predetermined tension to the traveling yarn Y. In this embodiment, the tension applying device 22 is a gate-type device with movable comb teeth arranged relative to the fixed comb teeth.

[0032] Tension detection device 24 detects the tension of the traveling yarn Y between yarn feeding device 12 and winding device 14. When the yarn Y becomes disconnected between yarn feeding device 12 and winding device 14 in the direction of yarn Y travel for some reason, yarn splicing device 26 splices the yarn Y on the yarn feeding device 12 side and the yarn Y on the winding device 14 side.

[0033] The yarn monitoring device 28 monitors the state of the yarn Y traveling in the yarn path and detects the presence of yarn defects based on the monitoring information. Yarn defects may include, for example, at least one of the following: abnormal thickness of the yarn Y, foreign matter contained in the yarn Y, or broken yarn. If the yarn monitoring device 28 detects a yarn defect, it outputs the defect information to the unit control unit 10.

[0034] The yarn-feeding side capture unit 30 draws and captures the broken yarn Y from the yarn-feeding device 12 and guides the captured yarn Y to the yarn-joining device 26. The yarn-feeding side capture unit 30 rotates using a horizontally extending shaft α as its rotation axis. The yarn-feeding side capture unit 30 is rotated by a drive source, for example, including a stepper motor. A suction port 30A that generates a suction flow is formed at the end of the yarn-feeding side capture unit 30. The suction port 30A is connected to a suction source (not shown) disposed on the end frame 5, etc., and is configured to attract and capture the yarn Y using the attractive force generated at the suction port 30A.

[0035] The yarn-feeding side capture unit 30 rotates through at least two locations: a yarn-feeding side capture position and a yarn-feeding side guide position. If a defect is detected by the yarn monitoring device 28 and the yarn Y is cut, the yarn-feeding side capture unit 30 captures the cut yarn Y from the package P at the aforementioned yarn-feeding side capture position and guides the yarn Y to the yarn splicing device 26 by rotating to the yarn-feeding side guide position.

[0036] The winding-side capturing section 40 draws in and captures the broken yarn Y on the winding side from the winding device 14, and guides the captured yarn Y to the yarn splicing device 26. The winding-side capturing section 40 rotates using a horizontally extending shaft β as its rotation axis. The winding-side capturing section 40 is rotated by a drive source, for example, including a stepper motor. A suction port (opening) 42A for generating suction flow is formed at the end of the winding-side capturing section 40. The suction port 42A is connected to a suction source (not shown) disposed on the end frame 5, etc., and is configured to attract and capture the yarn Y using the attraction force generated at the suction port 42A.

[0037] The winding-side capturing part 40 rotates through at least two locations: a winding-side capturing position and a winding-side guiding position. If a defect is detected by the yarn monitoring device 28 and the yarn Y is cut, the winding-side capturing part 40 captures the yarn Y from the package P at the winding-side capturing position and guides the yarn Y to the yarn splicing device 26 by rotating to the winding-side guiding position.

[0038] Here, in the automatic winding machine 1 equipped with multiple winding units 3, the direction in which the winding units 3 are arranged is defined as the left-right direction (second direction), the direction orthogonal to the left-right direction in the horizontal direction is defined as the front-back direction (third direction), the direction orthogonal to both the left-right and front-back directions is defined as the vertical direction (first direction), and the side in the front-back direction where the yarn Y to be wound into a package P exists relative to the rotation axis of the winding-side capture part 40 is defined as the front side. The directions "front," "back," "left," "right," "up," and "down" defined in this way are... Figures 1-3 The image in the middle shows...

[0039] like Figure 4 As shown, the winding-side capturing part 40 includes a tube part 41, a yarn attracting part 42, a connecting part 43, a first flow path direction changing part 44, and a second flow path direction changing part 45. Figure 4 As shown, with the winding-side capturing section 40 rotated upwards to attract and capture the broken yarn Y on the winding side from the winding device 14, the tube section 41 extends in the vertical direction (up-down direction). The tube section 41 is configured such that one end 41A can rotate using a horizontally extending shaft β as a rotation axis. The yarn attracting section 42 attracts the yarn Y from the attracting port 42A in the front-to-back direction. This attracting port 42A utilizes a supplied negative pressure to attract external air (yarn Y) and has a wide opening in the left-to-right direction. The connecting section 43 extends in the left-to-right direction, connecting the tube section 41 to the yarn attracting section 42.

[0040] Regarding the winding-side capturing section 40, to rephrase the previous paragraph, when the winding-side capturing section 40 is viewed from the front in the front-to-back direction while capturing the yarn Y of the package P, the yarn attracting section 42 attracts the yarn Y of the package P from the attracting port 42A, which is a wide opening in the left-to-right direction, toward the front. The connecting section 43 extends in the left-to-right direction. When the connecting section 43 is viewed from the top in the vertical direction, the connecting section 43 is formed such that a pair of opposite outer contours in the front-to-back direction bulge out toward the front and rear in an arc shape.

[0041] The tube 41 is connected to a suction source (not shown) for the flow of negative pressure (suction flow) generated at the suction port 42A. The tube 41 is fixedly formed such that the cross-sectional area of ​​its hollow portion is fixed in the extending direction and the shape of its hollow cross-section is circular. A rectifier plate 41F is formed on the hollow surface of the tube 41, extending along the extending direction of the tube 41 and protruding inwards. The protrusion height of the rectifier plate 41F varies depending on the application, for example, from 1 mm to 10 mm, more preferably from 3 mm to 7 mm. Three rectifier plates 41F are formed in the circumferential direction. The shape of the cross-section of the rectifier plate 41F orthogonal to the extending direction can be as follows... Figure 10 of (L), Figure 10 (M) and Figure 10 The (N) shown is rectangular, but can also be semi-circular, triangular, etc. When the inner hollow cross-section is circular, the rectifier 41F is positioned on the inner surface of the left semi-circular portion in the left-right direction. The rectifier 41F can also be positioned around the entire circumference of the inner hollow cross-section, but not on the right side in the left-right direction through which the attracted yarn Y passes. This prevents the yarn Y from contacting and hooking onto the rectifier 41F.

[0042] One end 41A of the tube 41 is connected to a tube portion extending in the direction of axis β, which extends in the left-right direction. This tube portion is connected to a suction source (not shown). More specifically, the hollow portion of the tube 41 is bent at 90 degrees at the aforementioned end 41A and communicates with the suction source (not shown). Unlike the yarn suction portion 42 and the connecting portion 43, which are described in detail later, the tube 41 is formed by a single component.

[0043] When viewed from above in the vertical direction, the yarn attracting portion 42 extends from the attracting port 42A toward the connecting portion 43 in the front-to-back direction. The yarn attracting portion 42 can extend horizontally from the attracting port 42A toward the connecting portion 43, or it can be inclined downwards, for example, toward the front. For example, the downward inclination angle is 10 degrees to 30 degrees relative to the horizontal direction.

[0044] When viewed from above in the vertical direction, the yarn attracting portion 42 is formed such that its width gradually decreases in the left and right directions as it faces forward. Specifically, the outer contour line 42L on the left side of the outer contour lines 42L and 42R on both sides of the yarn attracting portion 42 in the left and right directions slopes towards the right front. The inner cavity of the yarn attracting portion 42 is rectangular. The cross-sectional area of ​​the inner cavity of the yarn attracting portion 42 gradually decreases from the attracting port 42A towards the front. The yarn attracting portion 42 is formed by a concave lower part 42D and an upper part 42U arranged to cover the concave portion of the lower part 42D. The space surrounded by the lower part 42D and the upper part 42U forms the inner cavity of the yarn attracting portion 42.

[0045] When viewed from the front in the front-rear direction, the connecting portion 43 extends in the left-right direction and connects the tube portion 41 to the yarn suction portion 42. When viewed from the vertical direction, the connecting portion 43 is formed such that one pair of opposite outer contours in the front-rear direction bulges outward in an arc shape. The outer contour of the pair of opposite outer contours in the front-rear direction that is opposite to the suction port 42A side (the outer contour that is opposite to the opening side in the third direction) protrudes forward in the front-rear direction (the side opposite to the opening side in the third direction) than the connecting portion 43C of the tube portion 41 and the yarn suction portion 42.

[0046] More specifically, in the connecting portion 43, among the outer contour lines 43Lr and 43Lf of a pair of opposite outer contours in the front-rear direction, the rear outer contour line 43Lr bulges rearward, and the front outer contour line 43Lf bulges forward. When viewed from the vertical direction, the distance D between the rear outer contour line 43Lr and the front outer contour line 43Lf increases towards the right in the left-right direction. The front outer contour line 43Lf protrudes forward in the front-rear direction from the connecting portion 43C between the tube portion 41 and the yarn attracting portion 42. The connecting portion 43 is formed by a concave lower member 43D and an upper member 43U arranged to cover the concave portion of the lower member 43D. The space surrounded by the lower member 43D and the upper member 43U forms the hollow portion of the connecting portion 43.

[0047] The hollow portion of the connecting part 43 is roughly rectangular. The hollow portion of the connecting part 43 communicates with the hollow portions of the yarn suction part 42 and the tube part 41. The hollow portion of the connecting part 43 forms the air suction flow path. When the connecting part 43 is cut with a plane perpendicular to the vertical direction, the air suction flow path is formed such that a pair of inner walls 43Wr and 43Wf, facing each other in the front-rear direction, bulge out in an arc shape (become convex). When viewed from the vertical direction, the distance D between the rear inner wall 43Wr and the front inner wall 43Wf in the front-rear direction increases towards the right in the left-right direction. Of the pair of inner walls 43Wr and 43Wf that are opposite to the suction port 42A in the front-back direction, the inner wall 43Wf (the inner wall that is opposite to the opening side in the third direction) protrudes forward in the front direction (the side that is opposite to the opening side in the third direction) of the connection part 43C between the tube part 41 and the yarn suction part 42.

[0048] The first flow path direction changing section 44 is a connecting portion of the connecting portion 43 leading to the yarn attraction section 42, and is the portion where the orientation of the air attraction flow path changes from the front-to-back direction to the left-to-right direction. In other words, the first flow path direction changing section 44 is the portion where the attraction flow path (air attraction direction) of the yarn Y changes so that the yarn Y, which is attracted to the front side in the front-to-back direction, is attracted to the left side in the left-to-right direction. The first flow path direction changing section 44 is included in a part of the connecting portion 43. In the air attraction direction, the cross-sectional area SG of the air attraction flow path at the downstream end of the first flow path direction changing section 44 (refer to...) Figure 8 The cross-sectional area SA of the air suction flow path at the upstream end of the first flow path direction changing section 44 (refer to G) Figure 7 The proportion of (A) is 0.9 or more and less than 1.1, preferably 0.94 or more and less than 1.07, and more preferably 0.97 or more and less than 1.04.

[0049] Furthermore, the rate of change of the cross-sectional area of ​​the air suction flow path in the first flow path direction changing section 44 is less than 10%, preferably less than 6%, and more preferably less than 3%. The rate of change of the cross-sectional area of ​​the air suction flow path in the first flow path direction changing section 44 represents the percentage increase in the cross-sectional area of ​​the largest suction flow path relative to the smallest suction flow path in the first flow path direction changing section 44. In this embodiment, the connecting section 43 is formed such that, from... Figure 5 The cross-sectional area of ​​all sections observed along the A~G directions (i.e. Figure 7 (A) ~ Figure 8 The cross-sectional areas of SA, SB, SC, SD, SE, SF, and SG in (G) increase by less than 10% relative to the cross-sectional area of ​​the smallest attraction flow path in the first flow path direction changing unit 44.

[0050] The second flow path direction changing section 45 is the connecting portion of the connecting portion 43 to the through-pipe portion 41, and is the portion where the orientation of the air suction flow path changes from the left-right direction to the vertical direction. In other words, the second flow path direction changing section 45 is the portion where the suction direction changes so that the yarn Y, which is attracted to the left side in the left-right direction, is attracted to the lower side in the vertical direction. The second flow path direction changing section 45 is included in a part of the connecting portion 43. In the air suction direction, the cross-sectional area SN of the air suction flow path at the downstream end of the second flow path direction changing section 45 (refer to...) Figure 10 The cross-sectional area SH of the air suction flow path at the upstream end of the second flow path direction changing section 45 (refer to N) Figure 9 The proportion of (H) is 0.9 or more and less than 1.1, preferably 0.97 or more and less than 1.07, and more preferably 0.97 or more and less than 1.04.

[0051] Furthermore, the rate of change of the cross-sectional area of ​​the air suction flow path in the second flow path direction changing section 45 is less than 10%, preferably less than 6%, and more preferably less than 3%. The rate of change of the cross-sectional area of ​​the air suction flow path in the second flow path direction changing section 45 represents the percentage increase in the cross-sectional area of ​​the largest suction flow path relative to the smallest suction flow path in the second flow path direction changing section 45. In this embodiment, the connecting section 43 is formed such that, from... Figure 6 The cross-sectional area of ​​all sections observed in the H~N direction shown (i.e. Figure 9 (H)~ Figure 10 The cross-sectional areas of (N) including SH, SI, SJ, SK, SL, SM, and SN increase by less than 10% relative to the cross-sectional area of ​​the smallest attraction flow path in the second flow path direction change section 45.

[0052] Furthermore, regarding the cross-section of the suction flow path in the first flow path direction changing unit 44 and the second flow path direction changing unit 45, if the suction flow path is a curved section with a fixed curvature, it can be set as the surface where the suction flow path is cut along the direction of the radius of curvature, or it can be set as the surface where the suction flow path is cut orthogonal to the center line of the flow path extending along the flow path direction. If the suction flow path is not a single curved section, it is sufficient to set it as the surface where the suction flow path is cut orthogonal to the center line of the flow path extending along the flow path direction.

[0053] The effects of the winding-side capture unit 40 in the automatic winding machine 1, which includes the above-described embodiment, will be explained. Conventionally, in winding-side capture units as described above, energy loss is reduced by designing the suction flow path to minimize the flow of the suction air. However, in the winding-side capture unit 40, where the suction air flow path bends 90 degrees from the front-to-back direction to the left-to-right direction, and further bends 90 degrees from the left-to-right direction to the vertical direction, as in the above-described embodiment, the inventors of this application have found that such a design concept is not very helpful in reducing energy loss.

[0054] Therefore, in the winding-side capturing section 40 of the above embodiment, as Figure 5 As shown, when viewed vertically, the connecting portion 43 is formed with two opposing outer contours (outer contour lines 43Lr, 43Lf) bulging outwards in an arc shape in the front-to-back direction. Therefore, the airflow path (hollow portion) formed inside the connecting portion 43 can also be formed along the aforementioned outer contours (outer contour lines 43Lr, 43Lf). This airflow path formed along these outer contours (outer contour lines 43Lr, 43Lf) gently guides the airflow downstream, thus allowing the airflow drawn from the suction port 42A to flow smoothly in the suction direction.

[0055] In the winding-side capturing section 40 of the above embodiment, such as Figure 5 As shown, in a pair of outer contours (outer contour lines 43Lr, 43Lf), the outer contour (outer contour line 43Lf) that is opposite to the side of the opening of the suction port 42A in the front-to-back direction protrudes forward (opposite side) from the connection portion 43C between the tube portion 41 and the yarn suction portion 42 in the front-to-back direction. The flow path of the suction air formed along such an outer contour (outer contour line 43Lf) guides the suction air more gently downstream, thus enabling the suction air drawn from the suction port 42A to flow smoothly in the suction direction.

[0056] In the winding-side capturing section 40 of the above embodiment, such as Figure 5 As shown, the air intake path when the connecting portion 43 is cut with a plane orthogonal to the vertical direction is formed such that a pair of inner walls 43Wr and 43Wf bulge outwards from each other in an arc shape in the front-rear direction. The air intake path formed by these inner walls 43Wr and 43Wf guides the intake air smoothly downstream, thus enabling the intake air drawn from the intake port 42A to flow smoothly in the intake direction.

[0057] In the winding-side capturing section 40 of the above embodiment, such as Figure 5As shown, of the pair of inner walls 43Wr and 43Wf, the inner wall 43Wf, which is opposite to the suction port 42A side in the front-rear direction, protrudes forward in the front direction than the connection 43C between the tube portion 41 and the yarn suction portion 42. The airflow path formed by the inner wall 43Wf in this way guides the suction air more gently downstream, thus enabling the suction air drawn from the suction port 42A to flow smoothly in the suction direction.

[0058] In the winding-side capturing section 40 of the above embodiment, a first flow path direction changing section 44 is formed in the connecting portion 43 leading to the yarn attracting section 42, where the orientation of the air attracting flow path changes from the front-to-back direction to the left-to-right direction. In the air attracting direction, the cross-sectional area SG of the air attracting flow path at the downstream end of the first flow path direction changing section 44 (refer to...) Figure 8 The cross-sectional area SA of the air suction flow path at the upstream end of the first flow path direction changing section 44 (refer to G) Figure 7 The ratio of (A) is 0.9 or more and less than 1.1. In this structure, if the ratio of the change in cross-sectional area is small, then when the attraction force (negative pressure) from the negative pressure source is fixed, the ratio of the change in flow rate and flow velocity is also small. As a result, since the ratio of the change in airflow in the flow path is small, the reduction in the attraction efficiency in the first flow path direction changing section 44 can be suppressed.

[0059] Furthermore, in the winding-side capture section 40 of the above embodiment, the rate of change of the cross-sectional area of ​​the air suction flow path formed in the first flow path direction changing section 44 is less than 10%. In this structure, if the rate of change of the cross-sectional area is small, then when the suction force (negative pressure) from the negative pressure source is fixed, the rate of change of the flow rate and the flow velocity also becomes smaller. As a result, since the rate of change of the airflow in the flow path is smaller, the reduction in suction efficiency in the first flow path direction changing section 44 can be suppressed.

[0060] Furthermore, in the winding-side capturing section 40 of the above embodiment, a second flow path direction changing section 45 is formed in the connecting portion of the connecting section 43 leading to the tube section 41, where the orientation of the air suction flow path changes from the left-right direction to the vertical direction. In the air suction direction, the cross-sectional area SN of the air suction flow path at the downstream end of the second flow path direction changing section 45 (refer to...) Figure 10 The cross-sectional area SH of the air suction flow path at the upstream end of the second flow path direction changing section 45 (refer to N) Figure 9The ratio of (H) is 0.9 or more and less than 1.1. In this structure, if the ratio of the change in cross-sectional area is small, then with a fixed attraction force (negative pressure) from the negative pressure source, the ratio of the change in flow rate and velocity is also small. As a result, since the ratio of the change in airflow within the flow path is small, the reduction in attraction efficiency in the second flow path direction changing section 45 can be suppressed.

[0061] Furthermore, in the winding-side capture section 40 of the above embodiment, the rate of change of the cross-sectional area of ​​the air suction flow path formed in the second flow path direction changing section 45 is less than 10%. In this structure, if the rate of change of the cross-sectional area is small, then when the suction force (negative pressure) from the negative pressure source is fixed, the rate of change of the flow rate and the flow velocity also becomes smaller. As a result, since the rate of change of the airflow in the flow path is smaller, the reduction in suction efficiency in the second flow path direction changing section 45 can be suppressed.

[0062] Figure 11 (A) is a diagram showing the simulation results of the state of the suction flow in the winding-side capture section 40 of the above embodiment. Figure 11 (B) is a diagram showing the simulation results of the suction flow in the coiled-side trapping section 40 of a conventional structure (formed as a pair of opposite outer contours that do not bulge outwards in an arc shape in the front-rear direction). Those skilled in the art will understand this simply by viewing the simulation results. Figure 11 The suction flow in the winding-side capture section 40 of this embodiment shown in (A) is... Figure 11 Compared to the conventional structure shown in (B), the airflow exhibits less turbulence and a more uniform distribution. For example, it can be seen that... Figure 11 In the airflow shown in (A), there is no Figure 11 As shown in (B), the air flows in a partially swirling manner, and the airflow is further dispersed uniformly as a whole. Therefore, it can be seen that the winding-side capture section 40 of the above embodiment can make the suction air drawn from the suction port 42A flow smoothly in the suction direction.

[0063] The above description describes one embodiment, but one aspect of the present invention is not limited to the above embodiment. Various modifications can be made without departing from the spirit of the invention.

[0064] In the winding-side capturing section 40 of the above embodiment, an example was described in which the connecting section 43 extends in the left-right direction so that the external air (yarn Y) attracted by the yarn attracting section 42 in the front-back direction is attracted downstream in a state where it is bent in the left-right direction at 90 degrees, but it is not limited to this. For example, the attraction direction of the external air (yarn Y) attracted by the yarn attracting section 42 does not necessarily have to be orthogonal to the attraction direction of the connecting section 43, and the connecting section 43 may also be connected in a manner that crosses the attraction direction of the external air (yarn Y) attracted by the yarn attracting section 42 in a range of, for example, 80 degrees to 110 degrees. Similarly, the extending direction of the connecting section 43 does not necessarily have to be orthogonal to the extending direction of the tube section 41, and the connecting section 43 may also be connected in a manner that crosses the extending direction of the tube section 41 in a range of, for example, 80 degrees to 110 degrees.

[0065] In the above-described embodiments and variations of the winding-side capturing portion 40, the yarn attracting portion 42 is described as being formed by connecting (bonding, integrating) two components (lower component 42D and upper component 42U), but it can also be formed by a single component. Similarly, in the above-described embodiments, the connecting portion 43 is described as being formed by connecting (bonding, integrating) two components (lower component 43D and upper component 43U), but it can also be formed by a single component. Furthermore, in the above-described embodiments, the tube portion 41 is described as being formed by a single component, but it can also be formed by two or three or more components. Similarly, the yarn attracting portion 42 and the connecting portion 43 can also be formed by two or three or more components.

[0066] In the winding-side capturing section 40 of the above embodiments and modifications, the cross-sectional area SG of the air suction flow path at the downstream end of the first flow path direction changing section 44 is listed (refer to...). Figure 8 The cross-sectional area SA of the air suction flow path at the upstream end of the first flow path direction changing section 44 (refer to G) Figure 7 The ratio of (A) is 0.9 or more and less than 1.1, and the cross-sectional area SN of the air suction flow path at the downstream end of the second flow path direction changing section 45 is (refer to) Figure 10 The cross-sectional area SH of the air suction flow path at the upstream end of the second flow path direction changing section 45 (refer to N) Figure 9 The example described is that the connecting part 43 is formed in a manner where the ratio of (H) is 0.9 or more and less than 1.1, but it is not limited to this. It is also possible that only one of the first flow path direction changing part 44 and the second flow path direction changing part 45 meets the above ratio condition, or neither of them meets the above ratio condition.

[0067] Furthermore, in the winding-side capturing section 40 of the above-described embodiment and its modifications, an example was given in which the connecting section 43 is formed such that the rate of change of the cross-sectional area of ​​the air suction flow path in the first flow path direction changing section 44 is less than 10%, and the rate of change of the cross-sectional area of ​​the air suction flow path in the second flow path direction changing section 45 is less than 10%, but this is not a limitation. It is also possible that only one of the first flow path direction changing section 44 and the second flow path direction changing section 45 satisfies the above-described rate of change condition, or that neither of them satisfies the above-described rate of change condition.

Claims

1. A yarn winding device, characterized in that, have: Yarn feeding section; A winding section that winds the yarn from the yarn feeding section into a package; A yarn splicing device that connects the yarn on the yarn feeding section side to the yarn on the winding section side when the yarn breaks between the yarn feeding section and the winding section. and A yarn-catching nozzle that draws in and catches the broken yarn from the winding section side of the package, and guides the caught yarn to the yarn-joining device. The yarn-catching nozzle has: A tube, wherein one end of the tube is rotatable about a rotation axis, and the tube extends toward the other end; The yarn attracting section, when the extension direction of the tube is set as the first direction, has an opening that uses the supplied negative pressure to attract external air and is wide in a second direction that is substantially orthogonal to the first direction, and attracts the yarn upward from the opening in a third direction that is substantially orthogonal to both the first and second directions. and A connecting portion extending in the second direction connects the tube portion to the yarn attracting portion. When the connecting portion is viewed from the first direction, the connecting portion is formed such that it bulges outward in an arc shape on both sides of the outer contours facing each other in the third direction.

2. The yarn winding device according to claim 1, characterized in that, The outer contour of the outer contour that is opposite to the opening side in the third direction is more prominent than the connection between the tube and the yarn attraction part in the opposite direction in the third direction.

3. The yarn winding device according to claim 1 or 2, characterized in that, When the connecting portion is cut with a plane orthogonal to the first direction, the air intake path is formed such that a pair of inner walls facing each other in the third direction bulge out in an arc shape.

4. The yarn winding device according to claim 3, characterized in that, The inner wall of the pair of inner walls that is opposite to the opening side in the third direction protrudes in the opposite direction of the air suction flow path at the connection between the tube and the yarn suction part.

5. The yarn winding device according to any one of claims 1 to 4, characterized in that, In the connecting portion leading to the yarn attraction portion, a first flow path direction changing portion is formed where the orientation of the air attraction flow path changes from the third direction to the second direction. In the direction of air attraction, the ratio of the cross-sectional area of ​​the air attraction flow path at the downstream end of the first flow path direction changing section to the cross-sectional area of ​​the air attraction flow path at the upstream end of the first flow path direction changing section is 0.9 or more and less than 1.

1.

6. The yarn winding apparatus according to any one of claims 1 to 4, characterized in that, In the connecting portion leading to the yarn attraction portion, a first flow path direction changing portion is formed where the orientation of the air attraction flow path changes from the third direction to the second direction. The rate of change of the cross-sectional area of ​​the air intake flow path in the first flow path direction changing section is less than 10%.

7. The yarn winding apparatus according to any one of claims 1 to 4, characterized in that, In the connecting portion leading to the pipe, a second flow path direction changing portion is formed, where the orientation of the air suction flow path changes from the second direction to the first direction. In the direction of air attraction, the ratio of the cross-sectional area of ​​the air attraction flow path at the downstream end of the second flow path direction changing section to the cross-sectional area of ​​the air attraction flow path at the upstream end of the second flow path direction changing section is 0.9 or more and less than 1.

1.

8. The yarn winding apparatus according to any one of claims 1 to 4, characterized in that, In the connecting portion leading to the pipe, a second flow path direction changing portion is formed, where the orientation of the air suction flow path changes from the second direction to the first direction. The rate of change of the cross-sectional area of ​​the air intake flow path in the second flow path direction changing section is less than 10%.

9. A yarn-catching nozzle, characterized in that, Used in a yarn winding device, the yarn winding device comprising: Yarn feeding section; The winding section winds the yarn from the yarn feeding section into a package; and A yarn splicing device that connects the yarn on the feeding section side to the yarn on the winding section side when the yarn breaks between the feeding section and the winding section. The yarn-catching nozzle draws in and catches the broken yarn from the winding side of the package, and guides the caught yarn to the yarn-joining device. The yarn-catching nozzle has: A tube extending in a first direction, wherein one end is configured to rotate about a rotation axis; The yarn attracting section draws in external air using a supplied negative pressure and has a wide opening in a second direction that is substantially orthogonal to the first direction, and draws the yarn upward in a third direction that is substantially orthogonal to both the first and second directions. and A connecting portion extending in the second direction connects the tube portion to the yarn attracting portion. When the connecting portion is viewed from the first direction, the connecting portion is formed such that one of its outer contours facing the third direction bulges outward in an arc shape.

10. The yarn-catching nozzle according to claim 9, characterized in that, In the connecting portion leading to the yarn attraction portion, a first flow path direction changing portion is formed where the orientation of the air attraction flow path changes from the third direction to the second direction. The rate of change of the cross-sectional area of ​​the air intake flow path in the first flow path direction changing section is less than 10%.

11. The yarn-catching nozzle according to claim 9, characterized in that, In the connecting portion leading to the pipe, a second flow path direction changing portion is formed, where the orientation of the air suction flow path changes from the second direction to the first direction. The rate of change of the cross-sectional area of ​​the air intake flow path in the second flow path direction changing section is less than 10%.

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