Yarn winding machine

Abstract

To provide a yarn winding machine capable of avoiding the occurrence of a problem related to a yarn splicing operation even when the yarn splicing operation is performed in a state where a suction air flow is not generated in a suction duct.SOLUTION: A spinning machine 1 is equipped with a suction nozzle 27 having a first capturing part 33, and a suction device 13 having a function of blowing air onto the yarn Y2 to capture the yarn Y2, wherein a carriage controller 32 causes a yarn splicing carriage 3 to wait at an operation position with respect to a spinning unit 2 when the yarn splicing operation has been performed a predetermined number of times while the suction air flow by a blower 55 is no longer generated in a first suction duct 51 and a second suction duct 52, and when the suction air flow by the blower 55 is again generated in the first suction duct 51 and the second suction duct 52, the yarn pieces are collected in a collection box 58 via the first suction duct 51 and the second suction duct 52.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a yarn winding machine. [Background technology]

[0002] The yarn winding machine includes a plurality of winding units each having a yarn supplying device that supplies a yarn and a winding device that winds the yarn supplied from the yarn supplying device to form a package, a yarn splicing device that splices a first yarn from the yarn supplying device and a second yarn from the package on the winding device, a first capturing device that guides the first yarn to the yarn splicing device, a second capturing device that guides the second yarn to the yarn splicing device, a suction duct connected to the first and second capturing devices, a blower that generates a suction airflow in the suction duct, and a collection unit that collects yarn pieces generated by the yarn splicing operation via the suction duct (see, for example, Patent Document 1). The first and second capturing devices capture the yarn using the suction airflow of the connected suction duct. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-183338 Summary of the Invention [Problem to be solved by the invention]

[0004] In a yarn winding machine, it is necessary to periodically perform a recovery operation to remove yarn pieces recovered in the recovery unit or to clean the recovery unit. When performing these operations, for example, the door of the housing housing the recovery unit is opened. When the door is opened, the pressure inside the recovery unit becomes atmospheric pressure, and no suction airflow is generated in the suction duct connected to the recovery unit. This reduces the suction force of the first and second capturing devices connected to the suction duct. In a yarn winding machine, typically, when various operations are performed, the yarn splicing operation using the first and second capturing devices is not performed. However, there are cases where various operations are performed while the yarn splicing operation is being performed. In this case, the suction force of the first and second capturing devices is reduced during the yarn splicing operation, making it impossible to perform the yarn splicing operation.

[0005] After the yarn splicing operation, yarn fragments generated by the operation are collected in a collection section via the suction duct. However, if the yarn splicing operation is performed without generating a suction airflow in the suction duct and a large amount of yarn fragments accumulates in the suction duct, problems such as the suction duct becoming clogged with yarn fragments may occur.

[0006] An object of one aspect of the present invention is to provide a yarn winding machine that can avoid problems related to the yarn splicing operation even when the yarn splicing operation is performed without generating suction airflow in the suction duct. [Means for solving the problem]

[0007] A yarn winding machine according to one aspect of the present invention includes a plurality of winding units, each having a yarn supplying device that supplies yarn and a winding device that winds the yarn supplied from the yarn supplying device to form a package; a yarn splicing device that splices a first yarn from the yarn supplying device and a second yarn from the package of the winding device; a first capturing device that guides the first yarn to the yarn splicing device, the first capturing device having a first capturing part that sucks and captures a yarn end of the first yarn by injecting compressed air; a second capturing device that guides the second yarn to the yarn splicing device, the second capturing part having a function of sucking and capturing a yarn end of the second yarn by injecting compressed air, or a second capturing part that has a function of blowing compressed air to the second yarn to capture the second yarn. The machine includes a capturing device, a suction duct connected to the first capturing device and the second capturing device, a blower that generates a suction airflow in the suction duct, a recovery section that recovers yarn pieces generated by the yarn splicing operation via the suction duct, a carriage that has the first capturing device and is movable along the arrangement direction of the plurality of winding units, and a control section that controls the operation of the carriage, wherein when the yarn splicing operation has been performed a predetermined number of times while the suction airflow by the blower is no longer being generated in the suction duct, the control section causes the carriage to wait at an operation position relative to the winding unit, and when the suction airflow by the blower is again generated in the suction duct, the yarn pieces are recovered in the recovery section via the suction duct.

[0008] In a yarn winding machine according to one aspect of the present invention, the first capturing device has a first capturing section. The first capturing section captures the yarn end of the first yarn by injecting compressed air while sucking it. As a result, the first capturing device can capture the first yarn and guide it to the yarn joining device even when the suction airflow generated by the blower is no longer generated in the suction duct. The second capturing device has at least one of a second capturing section and a function of blowing air onto the second yarn to capture it. As a result, the second capturing device can capture the second yarn and guide it to the yarn joining device even when the suction airflow generated by the blower is no longer generated in the suction duct. Therefore, in the yarn winding machine, even if cleaning work, etc., is performed on the collection section during the yarn joining operation and the suction airflow generated by the blower is no longer generated in the suction duct, compressed air is acting on the first yarn and the second yarn, allowing the yarn joining operation to be performed. Therefore, the yarn winding machine can avoid failures in the yarn joining operation.

[0009] Furthermore, in the yarn winding machine, when the yarn splicing operation has been performed a predetermined number of times while the suction airflow by the blower is no longer being generated in the suction duct, the carriage is made to wait at the working position relative to the winding unit. In this way, the yarn winding machine limits the number of times the yarn splicing operation is performed while the suction airflow by the blower is no longer being generated in the suction duct to a predetermined number or less, so there is no risk of a large amount of yarn fragments generated during the yarn splicing operation accumulating in the suction duct. Therefore, in the yarn winding machine, when the suction airflow by the blower is generated in the suction duct again, the yarn fragments do not clog the suction duct and are collected in the collection section via the suction duct. Therefore, in the yarn winding machine, problems related to the yarn splicing operation can be avoided even when the yarn splicing operation is performed while the suction airflow is not being generated in the suction duct.

[0010] In one embodiment, the yarn winding machine includes a cutting device that cuts the yarn guided to the yarn joining device by the first capturing device and the second capturing device, and when the suction airflow by the blower is no longer generated in the suction duct, a piece of the yarn cut by the cutting device may remain in the suction duct at a recovery position relative to the winding unit where the piece of yarn was generated, and when the suction airflow by the blower is generated again in the suction duct, the retained piece of yarn may be recovered in the recovery section. With this configuration, the piece of yarn generated by the cutting device cutting the yarn is automatically recovered in the recovery section when the suction airflow by the blower is generated again in the suction duct, thereby avoiding problems such as the yarn pieces clogging the suction duct.

[0011] In one embodiment, when the blower no longer generates a suction airflow in the suction duct and the yarn splicing operation has been performed a predetermined number of times for the same winding unit, the control unit may make the carriage wait at the operation position for that winding unit. With this configuration, the yarn splicing operation can be performed a predetermined number of times for one winding unit even after the blower no longer generates a suction airflow in the suction duct.

[0012] In one embodiment, the predetermined number of times may be 1. With this configuration, the carriage waits after one yarn splicing operation, thereby preventing yarn pieces from accumulating in the suction duct.

[0013] In one embodiment, the second capturing device is provided in each of the plurality of winding units and has the function of capturing the second yarn by blowing air onto it, and when a yarn splicing operation is being performed in one winding unit in a state in which suction airflow is no longer generated in the suction duct, the second yarn may be captured by the second capturing device in another winding unit that requires the yarn splicing operation. With this configuration, when the carriage is positioned at another winding unit that requires the yarn splicing operation, the second yarn has already been captured by the second capturing device, allowing the yarn splicing operation to be performed efficiently.

[0014] In one embodiment, when the suction airflow by the blower is generated again in the suction duct, the first and second catching devices may perform a sending operation to send the yarn pieces into the suction duct, which can prevent the yarn pieces from remaining in the first and second catching devices.

[0015] In one embodiment, the yarn winding machine includes a detection device that detects yarn defects and a reversing device that rotates the package in a direction opposite to the winding direction. When the length of the yarn defect detected by the detection device is longer than a predetermined length in a state where the suction airflow from the blower is no longer generated in the suction duct, the reversing device may rotate the package by an amount less than the amount of reverse rotation of the package required to remove the defect and then stop the package rotation. When the suction airflow from the blower is no longer generated in the suction duct, rotating the package in the reverse direction to remove all so-called long defects may cause yarn pieces to become tangled in the suction duct. Therefore, in the above configuration, the package rotation is stopped after rotating by an amount less than the amount of reverse rotation of the package required to remove the defect. This prevents all long defects from entering the suction blower in a state where the suction airflow from the blower is no longer generated in the suction duct, thereby avoiding problems such as tangled yarn pieces in the suction duct.

[0016] In one embodiment, the air conditioner may include an operating unit for switching between a first state in which a suction airflow is generated in the suction duct by the blower and a second state in which a suction airflow is not generated in the suction duct by the blower, and when an operation for switching to the second state is performed using the operating unit, the suction airflow in the suction duct is immediately stopped. In this configuration, the first state and the second state can be switched immediately, so that no time is required for the transition between the first state and the second state. Therefore, the time the operator has to wait for the state to be switched can be reduced. [Effects of the Invention]

[0017] According to one aspect of the present invention, even when the yarn splicing operation is performed in a state where no suction airflow is generated in the suction duct, problems related to the yarn splicing operation can be avoided. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a front view of a spinning machine according to one embodiment. [Figure 2] FIG. 2 is a side view of a spinning unit included in the spinning machine of FIG. [Figure 3] FIG. 3 is a diagram showing the configuration of the first capturing unit. [Figure 4] Fig. 4(A) is a schematic diagram of the suction airflow supply mechanism, Fig. 4(B) is a plan view showing a lever provided in the first suction duct, and Fig. 4(C) is a cross-sectional view showing a shutter provided in the first suction duct. [Figure 5] FIG. 5 is a diagram for explaining the yarn splicing operation. [Figure 6] FIG. 6 is a diagram for explaining the yarn splicing operation. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicate explanations will be omitted. "Upstream" and "downstream" refer to the upstream and downstream in the running direction of the yarn during spinning. The dimensional proportions in the drawings do not necessarily match those in the description.

[0020] As shown in Fig. 1, a spinning machine (yarn winding machine) 1 includes a main frame 2A, a first end frame 4, a second end frame 5, a yarn splicing carriage (carriage) 3, a doffing carriage (not shown), and a suction airflow supply mechanism 50. The first end frame 4, the main frame 2A, and the second end frame 5 are arranged in one direction. The main frame 2A is provided with a plurality of spinning units (winding units) 2 that produce yarn Y and wind it into a package P, as well as a first suction duct 51 and a second suction duct 52 that are part of the suction airflow supply mechanism 50, which will be described in detail later. The plurality of spinning units 2 are arranged in one direction on the main frame 2A.

[0021] A part of the first suction duct 51, a part of the second suction duct 52, a blower 55, a collection box 58, etc., which are part of the suction air flow supply mechanism 50 described in detail later, are arranged on the first end frame 4. The first end frame 4 is arranged at one end in the arrangement direction of the multiple spinning units 2.

[0022] The second end frame 5 houses an air pressure adjusting unit for adjusting the pressure of compressed air (air) supplied from an air pressure supplying device (not shown) located in the textile factory where the spinning machine 1 is installed and supplying air to each part of the spinning machine 1, as well as a drive motor for supplying power to each part of the spinning unit 2.

[0023] The second end frame 5 is provided with a machine controller (control unit) 15 and an input device 18. The machine controller 15 centrally manages and controls each unit of the spinning machine 1. The machine controller 15 has an input / output interface for inputting and outputting signals to and from the outside, a storage unit such as a ROM (Read Only Memory) that stores programs and information for performing processing, a RAM (Random Access Memory) that temporarily stores data, a CPU (Central Processing Unit), and a communication circuit. Based on signals output by the CPU, the machine controller 15 stores input data in the RAM, loads programs stored in the ROM into the RAM, and executes the programs loaded into the RAM to perform various processes.

[0024] The input device 18 has a display screen 16 and input keys 17. The display screen 16 can display information about at least one of the settings and the status of the spinning unit 2. The operator can perform setting work for the spinning unit 2 by performing appropriate operations using the input keys 17. If the display screen 16 is configured as a touch panel display, the display screen 16 and the input keys 17 are configured integrally. The input device 18 allows the user to set spinning conditions for the air spinning device 7 via the display screen 16 or the input keys 17. The spinning conditions include the yarn type, yarn thickness, spinning speed, etc. The machine controller 15 controls each part of the spinning machine 1 based on these spinning conditions.

[0025] 1 and 2, each spinning unit 2 includes, in order from the upstream side in the running direction of the yarn Y, a draft device 6, an air spinning device (yarn supplying device) 7, a yarn monitoring device (detection device) 8, a tension sensor 9, a yarn pooling device 11, a waxing device 12, a suction device (second capturing device) 13, and a winding device 14. The draft device 6, the air spinning device 7, the yarn monitoring device 8, the tension sensor 9, the yarn pooling device 11, the waxing device 12, the suction device 13, and the winding device 14 are fixed to the main frame 2A. A unit controller (controller) 10 is provided for each of a predetermined number of spinning units 2 and controls the operation of the spinning units 2. The unit controller 10 may be provided in each spinning unit 2.

[0026] The draft device 6 drafts the sliver S. The draft device 6 has, in order from the upstream side in the running direction of the sliver S, a back roller pair, a third roller pair, a middle roller pair, and a front roller pair. Each roller pair has a bottom roller and a top roller. The bottom rollers are rotationally driven by a drive motor (not shown) provided on the second end frame 5 or a drive motor (not shown) provided on each draft device 6.

[0027] The air spinning device 7 twists the fiber bundle F drafted by the draft device 6 with a swirling air flow to produce yarn Y. The air spinning device 7 supplies the produced yarn Y downstream. In more detail (not shown), the air spinning device 7 has a spinning chamber, a fiber guide, a swirling airflow generating nozzle, and a hollow guide shaft. The fiber guide guides the fiber bundle F supplied from the upstream draft device 6 into the spinning chamber. The swirling airflow generating nozzle is disposed around the path along which the fiber bundle F travels. Air is sprayed from the swirling airflow generating nozzle, generating a swirling airflow within the spinning chamber. This swirling airflow inverts and swirls the fiber ends of the multiple fibers that make up the fiber bundle F. The hollow guide shaft guides the yarn Y from the spinning chamber to the outside of the air spinning device 7.

[0028] The yarn monitoring device 8 monitors the state of the traveling yarn Y between the air spinning device 7 and the yarn pooling device 11. The yarn monitoring device 8 monitors the state of the traveling yarn Y and detects the presence or absence of a yarn defect based on the monitored information. When the yarn monitoring device 8 detects a yarn defect, it transmits a yarn defect detection signal to the unit controller 10. When the unit controller 10 receives the yarn defect detection signal from the yarn monitoring device 8, it stops the operation of the air spinning device 7, thereby cutting the yarn Y. The cutting of the yarn Y may be achieved by stopping the drafting by the draft device 6 (rotation of the back roller pair).

[0029] The tension sensor 9 measures the tension of the traveling yarn Y between the air spinning device 7 and the yarn pooling device 11, and transmits a measurement signal to the unit controller 10.

[0030] The yarn pooling device 11 pools the yarn Y between the air spinning device 7 and the winding device 14. The yarn pooling device 11 has the functions of stably drawing out the yarn Y from the air spinning device 7, pooling the yarn Y sent out from the air spinning device 7 during a yarn splicing operation by the yarn splicing cart 3, and preventing the yarn Y from slackening, and adjusting the tension of the yarn Y on the winding device 14 side to prevent fluctuations in the tension of the yarn Y on the winding device 14 side from being transmitted to the air spinning device 7. The yarn pooling device 11 includes a yarn pooling roller 11A, a yarn hooking member 11B, and a pool amount sensor (not shown).

[0031] The waxing device 12 applies wax to the yarn Y between the yarn storage device 11 and the winding device 14.

[0032] The suction device 13 sucks in the yarn Y2 on the package P side when the yarn Y is broken between the air spinning device 7 and the winding device 14. The suction device 13 is provided between the yarn pooling device 11 and the winding device 14. In the present embodiment, the suction device 13 is fixedly provided on the main frame 2A. The suction device 13 may be provided movably. For example, the suction device 13 may be provided movably in a direction approaching and retracting from the yarn path. When the yarn splicing cart 3 performs an operation on the spinning unit 2, the suction device 13 is located upstream of the yarn splicing device 26 provided on the yarn splicing cart 3. When the yarn Y is broken, the suction device 13 can capture the yarn Y2 on the winding device 14 side, in other words, the package P side, upstream of the yarn splicing device 26.

[0033] The suction device 13 has a suction section 19, a shutter 20 that switches between communication with a first suction duct 51 (described later) (switching between suction in the suction section 19 and non-communication), a spray section 21, and a yarn capture detection sensor 22. The suction section 19 is provided with a suction port 19A. The suction section 19 is connected to the first suction duct 51. The opening and closing operation of the shutter 20 is controlled by the unit controller 10.

[0034] The jetting unit 21 jets compressed air toward the suction unit 19. The jetting unit 21 is disposed in a position where it can jet compressed air toward the suction port 19A of the suction unit 19. The jetting unit 21 jets compressed air toward the path of the yarn Y, blowing the compressed air against the yarn Y and pushing the yarn Y into the suction unit 19. The jetting of compressed air by the jetting unit 21 applies a blowing force to the suction device 13 that is different from the suction force caused by the suction air flow generated in the first suction duct 51. The jetting unit 21 is connected to a compressed air source (not shown). Whether or not compressed air is supplied from the jetting unit 21 is controlled by the unit controller 10.

[0035] The yarn capture detection sensor 22 is disposed immediately downstream of the suction section 19 (suction port 19A) of the suction device 13. The yarn capture detection sensor 22 can detect whether the suction device 13 has successfully captured the yarn Y2 on the package P side. The yarn capture detection sensor 22 detects the presence or absence of the yarn Y2 immediately downstream of the suction device 13, and transmits a detection signal to the unit controller 10. The unit controller 10 can detect whether the suction device 13 has successfully captured the yarn Y2 based on the detection signal from the yarn capture detection sensor 22. The yarn capture detection sensor 22 may be provided inside the suction section 19.

[0036] The winding device 14 winds the yarn Y onto a bobbin B to form a package P. The winding device 14 has a cradle arm 23, a winding drum 24, and a traverse guide 25. The cradle arm 23 rotatably supports the bobbin B. The cradle arm 23 is swingably supported by a support shaft 23A. When rotating the bobbin B (package P) in the winding direction (forward rotation), the cradle arm 23 brings the surface of the bobbin B or the surface of the package P into contact with the surface of the winding drum 24 with an appropriate pressure. A drive motor provided on the second end frame 5 simultaneously drives the winding drums 24 of the multiple spinning units 2. As a result, the bobbin B or package P is rotated in the winding direction in each spinning unit 2.

[0037] The traverse guide 25 of each spinning unit 2 is provided on a shaft shared by multiple spinning units 2. The drive motor of the second end frame 5 drives the shaft back and forth in the direction of the rotation axis of the winding drum 24, causing the traverse guide 25 to traverse the yarn Y at a predetermined width relative to the rotating bobbin B or package P.

[0038] When the yarn Y in one of the spinning units 2 is cut or broken for some reason, the yarn splicing cart 3 performs a yarn splicing operation on that spinning unit 2. For example, a plurality of yarn splicing carts 3 are provided in the spinning machine 1. The yarn splicing cart 3 is provided so as to be movable relative to the plurality of spinning units 2, and moves in the arrangement direction of the spinning units 2 (the left-right direction in FIG. 1). The yarn splicing cart 3 is movable to an operating position (a position where the yarn splicing operation is performed) relative to each of the plurality of spinning units 2.

[0039] The yarn splicing carriage 3 has a yarn splicing device 26, a suction nozzle (first capturing device) 27, a suction mouth (second capturing device) 28, a reversing device 29, and a carriage controller (control unit) 32.

[0040] The yarn joining device 26 performs a yarn joining operation to make the yarn Y continuous when the yarn Y is broken between the air spinning device 7 and the winding device 14. The yarn joining device 26 includes a clamp (not shown), a cutter (cutting device) 26A, and a yarn shifting lever (not shown). The yarn joining device 26 takes in the yarn (first yarn) Y1 (see FIG. 6) captured by the suction nozzle 27 by operating the yarn shifting lever, and holds and cuts the yarn by the clamp and cutter 26A. The yarn joining device 26 takes in the yarn (second yarn) Y2 (see FIG. 6) captured by the suction device 13 or the suction mouth 28 by operating the yarn shifting lever, and holds and cuts the yarn by the clamp and cutter 26A.

[0041] The yarn joining device 26 joins the cut yarn Y2 on the winding device 14 side with the cut yarn Y1 on the air spinning device 7 side. The yarn joining device 26 is a splicer that uses compressed air, or a knotter that mechanically joins the yarns Y together. In this embodiment, a splicer will be described as an example. In this embodiment, the yarn joining device 26 is movable in a direction approaching the path of the traveling yarn Y (to the left in the example of FIG. 2) or in a direction away from it (to the right in the example of FIG. 2). The yarn joining device 26 does not have to be provided so as to be able to approach or move away from the path of the yarn Y.

[0042] The suction nozzle 27 is rotatably supported by a support shaft 27a, and captures the yarn Y on the air spinning device 7 side and guides it to the yarn joining device 26. When capturing the yarn Y, the suction nozzle 27 sucks the yarn Y supplied from the air spinning device 7. The suction airflow during suction at the suction nozzle 27 is supplied from a second suction duct 52. The suction nozzle 27 is movable between a standby position, a first yarn capturing position where it captures the yarn Y supplied from the air spinning device 7, and a first yarn guiding position where it guides the yarn Y to the yarn joining device 26. The standby position and the first yarn guiding position may be the same position. The movement (rotation) of the suction nozzle 27 is controlled by a carriage controller 32.

[0043] As shown in FIG. 3, the suction nozzle 27 has a first capturing part 33. The first capturing part 33 is provided at the tip of the suction nozzle 27. The first capturing part 33 captures the yarn end of the yarn Y1 while sucking it by injecting compressed air. The first capturing part 33 has a nozzle member 34. The nozzle member 34 is configured in a cylindrical shape, and a suction passage 35 with a circular cross section is formed therein. One end of the suction passage 35 is connected to a suction port 34A formed in the tip surface of the nozzle member 34.

[0044] The suction passage 35 is configured as a stepped passage having a small-diameter portion 35A formed near the suction port 34A and a large-diameter portion 35B connected to the small-diameter portion 35A. The flow path cross-sectional area of the large-diameter portion 35B is larger than the flow path cross-sectional area of the small-diameter portion 35A. An annular first air chamber 36A and a second air chamber 36B are formed inside the nozzle member 34 so as to surround the suction passage 35. A compressed air pipe 39A is connected to the first air chamber 36A, and a compressed air pipe 39B is connected to the second air chamber 36B. Compressed air can be supplied to the first air chamber 36A and the second air chamber 36B from a compressed air source (not shown).

[0045] An ejector nozzle (intake nozzle) 37 for injecting compressed air into the suction passage 35 is connected to the first air chamber 36A. The ejector nozzle 37 is formed as a ring-shaped nozzle with a triangular cross section, and the cross-sectional outline is formed so as to gradually narrow toward the inner suction passage 35. The tip of the ejector nozzle 37 forms an outlet in the inner wall of the suction passage 35 (large diameter portion 35B), and is configured so that compressed air can be injected from this outlet toward the suction passage 35.

[0046] The ejector nozzle 37 has a ring-shaped outlet that ejects air all around. The ejector nozzle 37 is positioned at an appropriate angle to create an oblique airflow toward the base end of the suction nozzle 27. With this configuration, compressed air is injected at high speed from the first air chamber 36A through the ejector nozzle 37 into the suction passage 35, causing a pressure drop due to the well-known Venturi effect (ejector effect), and a suction flow toward the base end of the suction nozzle 27 acts on the suction port 34A.

[0047] A plurality of twisting nozzles 38 for injecting compressed air into the suction passage 35 are connected to the second air chamber 36B. The twisting nozzles 38 are arranged at equal intervals around the periphery of the suction passage 35, and each forms an outlet on the inner wall of the suction passage 35. For the sake of convenience in illustrating the cross section, the twisting nozzles 38 are depicted in Figure 3 as extending in the radial direction, but in reality the twisting nozzles 38 are oriented in the tangential direction of the circular suction passage 35.

[0048] In the first capturing section 33, compressed air is injected from the second air chamber 36B through the twisting nozzle 38 into the suction passage 35, thereby generating a swirling air current in the suction passage 35. The yarn Y1 introduced into the suction passage 35 of the first capturing section 33 is twisted by the action of the swirling air current generated at the twisting nozzle 38, and is drawn toward the base of the suction nozzle 27.

[0049] When the yarn splicing operation starts, compressed air is supplied from the compressed air pipes 39A and 39B, a swirling air flow is generated in the suction passage 35, and the first capturing part 33 sucks in and captures the yarn Y1. When the suction nozzle 27 guides the yarn Y1 to the yarn splicing device 26, the first capturing part 33 stops the supply of compressed air from the compressed air pipes 39A and 39B.

[0050] As shown in FIG. 2 , the suction mouth 28 is rotatably supported by a support shaft 28a. The suction mouth 28 approaches the winding device 14 to capture the yarn Y on the winding device 14 side, and moves away from the winding device 14 to guide the captured yarn Y to the yarn joining device 26. The suction airflow during suction in the suction mouth 28 is supplied from a second suction duct 52. The suction mouth 28 is movable between a standby position, a second yarn capturing position where it captures the yarn Y from the winding device 14, and a second yarn guiding position where it guides the yarn Y to the yarn joining device 26. The standby position and the second yarn guiding position may be the same position. The movement (rotation) of the suction mouth 28 is controlled by the carriage controller 32. The suction mouth 28 has a second capturing portion 40. The second capturing portion 40 is provided at the tip of the suction mouth 28. The second capturing portion 40 captures the yarn end of the yarn Y2 while sucking it with a jet of compressed air.

[0051] The suction airflow is supplied to the yarn splicing cart 3 via a second suction duct 52 extending from the first end frame 4 to the main frame 2A. The second suction duct 52 has a plurality of supply ports 52a. Each supply port 52a is formed in the second suction duct 52 at a position corresponding to each spinning unit 2 in order to supply the suction airflow to the yarn splicing cart 3. The second suction duct 52 has a plurality of shutters (not shown) corresponding to each supply port 52a. The shutters open and close each supply port 52a when the tip end 41a of the carriage-side duct 41 provided on the yarn splicing cart 3 comes into contact with the shutter. In other words, the shutters open and close each supply port 52a in conjunction with the movement of the yarn splicing cart 3. When the yarn splicing cart 3 is stopped at the working position, the corresponding supply port 52a is not closed by the shutter, and the suction nozzle 27 and suction mouth 28 of the yarn splicing cart 3 are connected to the second suction duct 52 via the carriage-side duct 41.

[0052] The reversing device 29 reverses the rotation of the package P of the winding device 14. The reversing device 29 has a support arm 30 and a reversing roller 31. One end of the support arm 30 is connected to a support shaft. This allows the support arm 30 to swing around the support shaft. The support arm 30 is moved by a drive unit (not shown), such as a motor, between a retracted position where the reversing roller 31 does not contact the package P and a contact position where the reversing roller 31 contacts the package P. The swing of the support arm 30 is controlled by a carriage controller 32.

[0053] The reverse roller 31 is provided at the other end of the support arm 30. The reverse roller 31 rotates (reverses) the package P in the unwinding direction, which is the opposite direction to the winding direction. When rotating the package P in the unwinding direction, the cradle arm 23 lifts up the surface of the package P away from the surface of the winding drum 24, and the yarn splicing carriage 3 brings the reverse roller 31 into contact with the surface of the package P. This allows the package P in contact with the reverse roller 31 to rotate in the unwinding direction. The rotation of the reverse roller 31 is controlled by a carriage controller 32.

[0054] The carriage controller 32 comprehensively controls the operation of the yarn splicing carriage 3. The carriage controller 32 has an input / output interface for inputting and outputting signals to and from the outside, a ROM in which programs and information for processing are stored, a storage unit such as RAM for temporarily storing data, a CPU, a communication circuit, etc. Based on signals output by the CPU, the carriage controller 32 stores input data in the RAM, loads programs stored in the ROM into the RAM, and executes the programs loaded into the RAM to perform various processes. The carriage controller 32 is capable of communicating with the unit controller 10 and the machine controller 15.

[0055] The carriage controller 32 controls the yarn splicing operation by the yarn splicing carriage 3 and the movement of the yarn splicing carriage 3. The carriage controller 32 is connected to the unit controller 10. At an appropriate timing after the yarn monitoring device 8 of a certain spinning unit 2 detects a yarn defect, the unit controller 10 transmits a yarn splicing request signal to the machine controller 15. Upon receiving the yarn splicing request signal, the machine controller 15 transmits a control signal to the carriage controller 32. This allows the yarn splicing carriage 3 to perform a yarn splicing operation for the spinning unit 2 that transmitted the yarn splicing request signal.

[0056] The following describes how to use the suction device 13 and the suction mouth 28 when performing a yarn splicing operation in the spinning machine 1. In this embodiment, there are two types of yarn splicing operations: "fixed capture yarn splicing" and "movable capture yarn splicing," and the suction device 13 and the suction mouth 28 are alternatively selected. When spinning is interrupted, the machine controller 15 determines whether to perform fixed capture yarn splicing or movable capture yarn splicing based on various factors.

[0057] In the fixed capture yarn splicing operation, the yarn Y2 on the winding device 14 side is captured by the suction device 13, and the yarn is spliced by the yarn splicing device 26. In the movable capture yarn splicing operation, the yarn Y2 on the winding device 14 side is captured by the suction mouth 28, and the suction mouth 28 guides the yarn Y2 so that the yarn splicing device 26 can take in the yarn Y2, and then the yarn splicing is performed by the yarn splicing device 26.

[0058] In both the fixed capture yarn splicing and the moving capture yarn splicing, the yarn Y1 on the air spinning device 7 side is captured by the suction nozzle 27, and the yarn Y1 is guided by the suction nozzle 27 so that the yarn splicing device 26 can take in the yarn Y1.

[0059] For example, consider a case where the yarn monitoring device 8 detects a yarn defect and the yarn Y is cut to remove the yarn defect. If fixed capture yarn splicing is to be performed, the rotation of the package P needs to be stopped in a state where the yarn end of the yarn Y on the package P side is captured by the suction device 13. If the amount of yarn stored on the yarn storage roller 11A is equal to or greater than a predetermined amount when the yarn defect is detected, it is determined that fixed capture yarn splicing will be performed.

[0060] If the amount of accumulated yarn on the yarn accumulation roller 11A is less than a predetermined amount, the suction device 13 cannot catch the yarn Y in time, and the yarn end passes through the suction device 13 due to the rotation of the package P until it actually stops. In this case, the machine controller 15 determines to perform mobile capture yarn splicing. If the yarn Y is cut downstream of the suction device 13 due to abnormal tension generated during winding of the package P, for example, the machine controller 15 also determines to perform mobile capture yarn splicing.

[0061] The above description is merely an example of the determination of whether to perform fixed capture yarn splicing or moving capture yarn splicing, and the determination can also be made based on other criteria.

[0062] When a package P becomes full in a certain spinning unit 2, the doffing cart doffs the package P and supplies a new bobbin B to the spinning unit 2.

[0063] 1 and 4(A), the suction air flow supply mechanism 50 supplies a suction air flow to the suction device 13 provided in the spinning unit 2 and to the suction nozzle 27 and the suction mouth 28 provided in the yarn splicing cart 3. The suction air flow supply mechanism 50 includes a first suction duct 51, a second suction duct 52, a blower 55, and a collection box (collection unit) 58.

[0064] The first suction duct 51 is connected to the suction devices 13 of the multiple spinning units 2. The first suction duct 51 extends in the arrangement direction of the spinning units 2. The first suction duct 51 is, for example, a rectangular tube member with a rectangular inner cross section. The second suction duct 52 is connected to the suction nozzle 27 and the suction mouth 28. The second suction duct 52 extends in the arrangement direction of the spinning units 2. The second suction duct 52 is, for example, a rectangular tube member with a rectangular inner cross section. In this embodiment, the end of the second suction duct 52 (the portion located on the blower 55 side) merges with the end of the first suction duct 51 (the portion located on the blower 55 side).

[0065] The blower 55 generates a suction airflow. The blower 55 is driven by a blower motor 55M. The blower 55 is connected to one end of the first suction duct 51 and one end of the second suction duct 52 via a collection box 58. The suction port 55A of the blower 55 is connected to the first suction duct 51 and the second suction duct 52, and generates a suction airflow in the first suction duct 51 and the second suction duct 52. The discharge port 55B of the blower 55 is connected to a sub-duct (not shown).

[0066] The collection box 58 uses a filter (not shown) to collect yarn pieces contained in the suction airflow circulating from the suction device 13 via the first suction duct 51, and yarn pieces contained in the suction airflow circulating from the suction nozzle 27 and suction mouth 28 of the yarn splicing cart 3 via the second suction duct 52. The collection box 58 is provided with an openable and closable door 59. The collected yarn pieces are stored in the collection box 58 and are removed by an operator through the door 59 by collection or cleaning under predetermined conditions. The collection box 58 is also provided with a static pressure sensor 58A that detects the static pressure of the suction airflow inside the collection box 58.

[0067] 4(B), in this embodiment, a lever (operating portion) 57 is provided on the outer surface of the end portion of the first suction duct 51 (a portion closer to the collection box 58 than the joining position of the second suction duct 52). The lever 57 is rotatably supported by a support shaft 57A that penetrates the first suction duct 51. A plate-shaped shutter 57B is attached to a portion of the support shaft 57A that is located inside the first suction duct 51. As a result, when an operator rotates the lever 57, the shutter 57B rotates in conjunction with the rotation of the lever 57, thereby permitting or prohibiting the flow of suction airflow through the first suction duct 51 and the second suction duct 52.

[0068] The lever 57 functions as a switching unit that switches the mode of the suction airflow through the first suction duct 51 and the second suction duct 52 between a flow mode (first state) and a stop mode (second state). The flow mode is a mode for allowing the flow of the suction airflow through the first suction duct 51 and the second suction duct 52. As shown in FIG. 4(C), in the flow mode, the shutter 57B is arranged parallel to the flow direction of the suction airflow through the first suction duct 51, and the shutter 57B allows the flow of the suction airflow through the first suction duct 51. The stop mode is a mode for stopping the flow of the suction airflow through the first suction duct 51 and the second suction duct 52. In the stop mode, the shutter 57B is arranged perpendicular to the flow direction of the suction airflow through the first suction duct 51, and the shutter 57B immediately prohibits the flow of the suction airflow through the first suction duct 51. That is, in the stop mode, the suction airflow is immediately stopped from being generated in the first suction duct 51. "Immediately" means approximately simultaneously with the operation of the lever 57.

[0069] The first suction duct 51 is provided with a proximity sensor 57C that detects the operation of the lever 57 or the operation of at least a part of a portion that operates in conjunction with the lever 57. The proximity sensor 57C detects a first lever operation and a second lever operation of the lever 57. The first lever operation is the operation of the lever 57 when the lever 57 switches from the circulation mode to the stop mode. The second lever operation is the operation of the lever 57 when the lever 57 switches from the stop mode to the circulation mode. The proximity sensor 57C is positioned so that it can detect the first lever operation at a position where the lever 57 has rotated approximately 10° when the lever 57 switches from the circulation mode to the stop mode.

[0070] Next, a description will be given of the operation of the spinning machine 1. The following describes, as an example, a case where the yarn splicing operation is performed using the suction device 13 of the spinning unit 2 and the suction nozzle 27 of the yarn splicing carriage 3. The following also describes a case where a yarn defect is detected and the yarn Y is cut.

[0071] When the yarn monitoring device 8 detects a yarn defect during winding of the yarn Y, the yarn monitoring device 8 transmits a yarn defect detection signal to the unit controller 10. Upon receiving the yarn defect detection signal, the unit controller 10 stops the supply of air to the air spinning device 7 to interrupt the production of the yarn Y and cut the yarn Y. The yarn defect detected by the yarn monitoring device 8 is contained in the yarn Y2 on the package P side.

[0072] Next, the unit controller 10 controls the deceleration of the rotation of the package P. The unit controller 10 also decelerates the rotation of the yarn pooling roller 11A of the yarn pooling device 11. The deceleration of the rotation of the yarn pooling roller 11A is preferably performed simultaneously with the deceleration of the rotation of the package P, but may be performed after the deceleration of the rotation of the package P.

[0073] As winding by the winding device 14 progresses, the yarn Y remaining on the yarn storage roller 11A of the yarn storage device 11 is pulled out, and the amount of yarn Y stored on the yarn storage roller 11A decreases. As shown in Fig. 5, the unit controller 10 opens the shutter 20 of the suction device 13 at a predetermined timing and activates the ejection unit 21 of the suction device 13 to start suction of the yarn Y2 by the suction device 13. Almost simultaneously with the start of suction by the suction device 13, the unit controller 10 stops winding by the winding device 14.

[0074] The unit controller 10 transmits a yarn splicing request signal to the machine controller 15 at an appropriate timing. Upon receiving the yarn splicing request signal, the machine controller 15 transmits a control signal to the carriage controller 32. In response to this, the carriage controller 32 causes the yarn splicing carriage 3 to travel to the spinning unit 2 that transmitted the yarn splicing request signal, and stops the yarn splicing carriage 3 at the working position of the spinning unit 2.

[0075] The unit controller 10 detects whether or not the suction device 13 has successfully captured the yarn Y2 based on the detection signal from the yarn capture detection sensor 22. When detecting that the suction device 13 has successfully captured the yarn Y2, the carriage controller 32 may operate the reversing device 29 to cause the suction device 13 to suck in the yarn Y2 of a length required to remove the yarn defect.

[0076] The carriage controller 32 also rotates the suction nozzle 27 to position the first catching portion 33 between the air spinning device 7 and the yarn pooling device 11. Substantially simultaneously with the rotation of the suction nozzle 27, a suction flow is generated in the first catching portion 33 of the suction nozzle 27, and air is ejected from the air spinning device 7. When air is ejected from the air spinning device 7, the air pressure causes the yarn end of the yarn Y1 to be sent out of the air spinning device 7. This allows the suction nozzle 27 to capture the yarn Y1.

[0077] 6, when the suction nozzle 27 captures the yarn Y1, the unit controller 10 rotates the suction nozzle 27 downward while continuing suction, thereby pulling out the yarn Y1 from the air spinning device 7 and guiding it to the yarn joining device 26. When guiding the yarn Y1 to the yarn joining device 26 is completed, the yarn Y1 between the air spinning device 7 and the suction nozzle 27 engages with the yarn hooking member 11B of the yarn pooling device 11, and winding of the yarn Y1 around the yarn pooling roller 11A begins. Thereafter, the unit controller 10 stops spraying air from the twisting nozzle 38.

[0078] Thereafter, the unit controller 10 starts the yarn splicing by the yarn splicing device 26. The yarn splicing device 26 takes in the yarns Y1 and Y2 by operating the yarn pulling lever. The yarn splicing device 26 also cuts a portion of the yarns Y1 and Y2 with the cutter 26A. The pieces of yarn cut by the cutter 26A are collected in the collection box 58 via the first suction duct 51 and the second suction duct 52. This completes the yarn splicing operation. When the yarn splicing operation is completed, the unit controller 10 causes the winding device 14 to resume winding of the yarn Y.

[0079] In the spinning machine 1, if the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52 during the above-mentioned yarn splicing operation, and the yarn splicing operation has been performed a predetermined number of times, the carriage controller 32 makes the yarn splicing carriage 3 wait at the working position for the spinning unit 2. The machine controller 15 determines that the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52 when the static pressure value detected by the static pressure sensor 58A falls below a predetermined value, or when the state of the spinning machine 1 is changed to the stop mode by operation of the lever 57 (when operation of the lever 57 is detected by the proximity sensor 57C).

[0080] In this embodiment, when one yarn splicing cart 3 performs a yarn splicing operation for one spinning unit 2 once, the yarn splicing cart 3 is made to wait at the work position for that spinning unit 2. That is, in this embodiment, the predetermined number of times is one time. The predetermined number of times can be set arbitrarily. In this embodiment, the spinning machine 1 includes multiple yarn splicing carts 3. A different number of times may be set as the predetermined number for each yarn splicing cart 3, or the same number may be set. If multiple times (for example, three times) are set as the predetermined number, one yarn splicing cart 3 is made to wait at the work position for that spinning unit 2 once it has performed the yarn splicing operation for one spinning unit 2 (the same spinning unit 2) multiple times.

[0081] Performing the yarn splicing operation means performing a series of operations until the yarn splicing is completed, such as capturing the yarn Y with the suction device 13 and the suction nozzle 27 and guiding it to the yarn splicing device 26, and then performing the yarn splicing with the yarn splicing device 26. For example, a failure to capture the yarn Y1 by the suction device 13 is not counted as a yarn splicing operation. That is, even if the suction device 13 fails to capture the yarn Y1 twice, the predetermined number of times is not counted as two. In other words, if the suction device 13 fails to capture the yarn Y1 twice and then succeeds in capturing it the next time and performs a yarn splicing, the predetermined number of times is counted as one. Note that if the suction device 13 or the suction nozzle 27 fails to capture the yarn Y three times in a row, for example, the yarn splicing operation may be stopped and a notification to that effect may be issued.

[0082] Yarn pieces generated by the yarn splicing operation are retained in the first suction duct 51 and the second suction duct 52. In the spinning machine 1, when the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52, the yarn pieces are collected in the collection box 58 via the first suction duct 51 and the second suction duct 52.

[0083] Furthermore, in the spinning machine 1, when the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, if a yarn splicing operation is required in another spinning unit 2 other than the spinning unit 2 that is the target of the yarn splicing operation (a spinning unit 2 whose yarn splicing carriage 3 is not positioned at the working position), the yarn Y2 is captured by the suction device 13 in the other spinning unit 2. In this case, in the spinning machine 1, when the suction airflow by the blower 55 is again generated in the first suction duct 51 and the second suction duct 52, the yarn splicing carriage 3 travels to the other spinning unit 2, and the other spinning unit 2 performs the yarn splicing operation.

[0084] When the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52, the carriage controller 32 causes the suction nozzle 27 (first capturing portion 33) to perform a sending operation to send the yarn piece to the second suction duct 52. Specifically, the yarn splicing carriage 3 continues to stop at the work position where it was stopped, and causes the suction nozzle 27 to inject compressed air regardless of the yarn splicing operation. As a result, even if there is a yarn piece remaining in the suction nozzle 27, the yarn piece is blown away to the second suction duct 52. The machine controller 15 determines that the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52 when the static pressure value detected by the static pressure sensor 58A becomes larger than a predetermined value, or when the state of the spinning machine 1 is changed to the circulation mode by operation of the lever 57 (when operation of the lever 57 is not detected by the proximity sensor 57C).

[0085] When the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52, the unit controller 10 activates the injection part 21 of the suction device 13 to send the yarn piece to the first suction duct 51. The sending operation may be performed by both the suction nozzle 27 and the suction device 13, or by only one of them.

[0086] When the length of a defect in the yarn Y detected by the yarn monitoring device 8 is longer than a predetermined length in a state in which the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, the reversing device 29 rotates the package P by an amount of rotation that is smaller than the amount of rotation of the package P in the reverse direction that is necessary to remove the defect, and then stops the rotation of the package P. The predetermined length is set as appropriate. The carriage controller 32 obtains the length of the yarn defect based on the detection result of the yarn monitoring device 8.

[0087] In the spinning machine 1, when the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, the yarn splicing operation is not performed if the length of the defect in the yarn Y detected by the yarn monitoring device 8 is longer than a predetermined length. In the spinning machine 1, when the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52, the carriage controller 32 controls the reversing device 29 to reverse the rotation of the package P by the amount of rotation of the package P required to remove the defect, thereby performing the yarn splicing operation.

[0088] As described above, in the spinning machine 1 according to this embodiment, the suction nozzle 27 has the first capturing section 33. The first capturing section 33 captures the yarn end of the yarn Y1 while sucking it in by injecting compressed air. This allows the suction nozzle 27 to capture the yarn Y1 and guide it to the yarn joining device 26 even when the suction airflow caused by the blower 55 is no longer generated in the second suction duct 52. The suction mouth 28 has the second capturing section 40. Furthermore, the suction device 13 has the ejection section 21. This allows the suction mouth 28 and the suction device 13 to capture the yarn Y2 and guide it to the yarn joining device 26 even when the suction airflow caused by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52. Therefore, in the spinning machine 1, even if the collection box 58 is cleaned during the yarn splicing operation and the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, the compressed air acts on the yarns Y1 and Y2, so the yarn splicing operation can be performed. Therefore, in the spinning machine 1, failures in the yarn splicing operation can be avoided.

[0089] Furthermore, in the spinning machine 1, when the yarn splicing operation has been performed a predetermined number of times in a state in which the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, the yarn splicing carriage 3 is made to wait at the working position relative to the spinning unit 2. In this way, in the spinning machine 1, the number of times the yarn splicing operation is performed in a state in which the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52 is limited to a predetermined number of times or less, so there is no risk of a large amount of yarn fragments generated by the yarn splicing operation accumulating in the first suction duct 51 and the second suction duct 52. Therefore, in the spinning machine 1, when the suction airflow by the blower 55 is again generated in the first suction duct 51 and the second suction duct 52, the yarn fragments do not clog the first suction duct 51 and the second suction duct 52, and the yarn fragments are collected in the collection box 58 via the first suction duct 51 and the second suction duct 52. Therefore, in the spinning machine 1, even if the yarn splicing operation is performed in a state where no suction airflow is generated in the first suction duct 51 and the second suction duct 52, problems related to the yarn splicing operation can be avoided.

[0090] In the spinning machine 1 according to this embodiment, when the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, the yarn pieces of the yarns Y1, Y2 cut by the cutter 26A of the yarn splicing device 26 remain in the first suction duct 51 and the second suction duct 52 at the recovery position relative to the spinning unit 2 where the yarn pieces were generated. In the spinning machine 1, when the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52, the retained yarn pieces are recovered in the recovery box 58. With this configuration, when the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52, the yarn pieces generated by the cutting of the yarns Y1, Y2 by the cutter 26A are automatically recovered in the recovery box 58, thereby preventing problems such as clogging of the first suction duct 51 and the second suction duct 52 with yarn pieces.

[0091] In the spinning machine 1 according to this embodiment, each of the multiple spinning units 2 is equipped with a suction device 13. In the spinning machine 1, when one spinning unit 2 is performing a yarn splicing operation in a state in which suction airflow is no longer generated in the first suction duct 51 and the second suction duct 52, the yarn Y2 is captured by the suction device 13 in the other spinning units 2 that require the yarn splicing operation. With this configuration, when the yarn splicing carriage 3 is positioned in the other spinning units 2 that require the yarn splicing operation, the yarn Y2 has already been captured by the suction device 13, allowing the yarn splicing operation to be performed efficiently.

[0092] In the spinning machine 1 according to this embodiment, when the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52, the suction nozzle 27, the suction mouth 28, and the suction device 13 perform a delivery operation to deliver the yarn pieces to the first suction duct 51 and the second suction duct 52. This configuration makes it possible to prevent yarn pieces from remaining in the suction nozzle 27, the suction mouth 28, and the suction device 13.

[0093] In the spinning machine 1 according to this embodiment, when the length of a defect in the yarn Y detected by the yarn monitoring device 8 is longer than a predetermined length in a state in which the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, the reverse rotation device 29 rotates the package P by an amount smaller than the amount of rotation of the package P in the reverse direction necessary to remove the defect, and then stops the rotation of the package P. If the package P is rotated in the reverse direction to remove all so-called long defects in a state in which the suction airflow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, there is a risk that yarn pieces will become tangled in the first suction duct 51 and the second suction duct 52. Therefore, in the spinning machine 1, the rotation of the package P is stopped after rotating the package P by an amount smaller than the amount of rotation of the package P in the reverse direction necessary to remove the defect. As a result, in the spinning machine 1, when the suction air flow by the blower 55 is no longer generated in the first suction duct 51 and the second suction duct 52, not all long defects enter the first suction duct 51 and the second suction duct 52, thereby avoiding problems such as tangled pieces of yarn in the first suction duct 51 and the second suction duct 52.

[0094] The spinning machine 1 according to this embodiment includes a lever 57 that switches between a circulation mode in which a suction airflow by the blower 55 is generated in the first suction duct 51 and the second suction duct 52, and a stop mode in which a suction airflow by the blower 55 is not generated in the first suction duct 51 and the second suction duct 52. When the lever 57 is operated to switch to the stop mode, the suction airflow is immediately stopped from being generated in the first suction duct 51 and the second suction duct 52. With this configuration, the circulation mode and the stop mode can be switched immediately, so no time is required for the transition between the circulation mode and the stop mode. This reduces the time an operator has to wait for the mode to be switched.

[0095] Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0096] In the above embodiment, an example has been described in which each of the multiple spinning units 2 is equipped with a suction device 13, and the suction mouth 28 is equipped with the second capturing section 40. However, the spinning machine 1 may be equipped with only one of the suction device 13 and the suction mouth 28.

[0097] In the above embodiment and modified example, an embodiment has been described in which, when the suction airflow by the blower 55 is generated again in the first suction duct 51 and the second suction duct 52, the first catching part 33 of the suction nozzle 27 is activated to perform the operation of feeding the yarn piece inside the suction nozzle 27. However, the operation of feeding the yarn piece inside the suction nozzle 27 may be performed by a device other than the first catching part 33. Similarly, the suction device 13 and the suction mouth 28 may be performed by a device other than those described in the embodiment.

[0098] In the above embodiment and modified examples, the yarn splicing device 26 has been described as having the cutter 26A. However, the cutting device that cuts the yarn Y guided to the yarn splicing device 26 by the suction nozzle 27 and the suction device 13 (suction mouth 28) may be provided outside the yarn splicing device 26.

[0099] In the above embodiment and modified example, an example has been described in which the winding drums 24 and traverse guides 25 of multiple spinning units 2 are driven simultaneously. However, each spinning unit 2 may be configured to include a drive unit that drives the winding drum 24 and a drive unit that drives the traverse guide 25. In this case, the reversing device 29 of the yarn splicing cart 3 may be omitted, and the winding drum 24 (reversing device) may rotate the package P in the direction opposite to the winding direction.

[0100] In the above embodiment and modified example, a configuration in which a plurality of yarn splicing carriages 3 are provided has been described as an example. However, a configuration in which only one yarn splicing carriage 3 is provided may also be used.

[0101] In the above embodiment and modified examples, the first suction duct 51 and the second suction duct 52 suck in the yarn pieces. However, the concept of "yarn pieces" may also include fluff.

[0102] In the above embodiment and modified examples, a spinning machine 1 equipped with an air spinning device 7 has been described as an example of a yarn winding machine. A yarn winding machine according to one aspect of the present invention is not limited to the above spinning machine 1, and may be, for example, an open-end spinning machine or an automatic winder. [Explanation of symbols]

[0103] 1...spinning machine (yarn winding machine), 2...spinning unit (winding unit), 3...yarn splicing carriage (carriage), 7...air spinning device (yarn feeding device), 13...suction device (second capturing device), 14...winding device, 15...machine controller (control unit), 26...yarn splicing device, 27...suction nozzle (first capturing device), 28...suction mouth (second capturing device), 29...reversing device, 32...carriage controller (control unit), 33...first capturing section, 40...second capturing section, 51...first suction duct (suction duct), 52...second suction duct (suction duct), 55...blower, 57...lever (operating section), P...package, Y...yarn, Y1...first yarn, Y2...second yarn.

Claims

1. a plurality of winding units each including a yarn supplying device that supplies a yarn and a winding device that winds the yarn supplied from the yarn supplying device to form a package; a yarn splicing device that splices a first yarn from the yarn supplying device and a second yarn from the package of the winding device; a first capturing device that guides the first yarn to the yarn joining device, the first capturing device having a first capturing portion that sucks and captures a yarn end of the first yarn by injecting compressed air; a second capturing device that guides the second yarn to the yarn joining device, the second capturing device having a function of a second capturing section that sucks and captures a yarn end of the second yarn by injecting compressed air, or a second capturing device that blows compressed air onto the second yarn to capture the second yarn; a suction duct connected to the first capturing device and the second capturing device; a blower that generates a suction airflow in the suction duct; a collecting section that collects yarn pieces generated by the yarn splicing operation through the suction duct; a carriage having the first capturing device and movable along an arrangement direction of the plurality of winding units; a control unit for controlling the operation of the carriage, the control unit causes the carriage to wait at an operation position for the winding unit when the yarn splicing operation has been performed a predetermined number of times in a state in which the suction airflow by the blower is no longer generated in the suction duct, When the suction airflow by the blower is generated again in the suction duct, the yarn pieces are collected in the collection section via the suction duct.

2. a cutting device that cuts the yarn guided to the yarn joining device by the first capturing device and the second capturing device, when the suction airflow by the blower is no longer generated in the suction duct, the yarn piece of the yarn cut by the cutting device remains in the suction duct at a recovery position relative to the winding unit where the yarn piece was generated, The yarn winding machine according to claim 1 , wherein when the suction airflow by the blower is generated again in the suction duct, the retained yarn pieces are collected in the collection section.

3. 3. The yarn winding machine according to claim 1, wherein when the yarn splicing operation has been performed the predetermined number of times in the same winding unit in a state in which the suction airflow by the blower is no longer generated in the suction duct, the control unit causes the carriage to wait at an operation position for the winding unit.

4. The yarn winding machine according to any one of claims 1 to 3, wherein the predetermined number of times is one time.

5. the second catching device is provided in each of the plurality of winding units and has a function of blowing compressed air to the second yarn to catch the second yarn; 5. The yarn winding machine according to claim 1, wherein, when the suction airflow is no longer generated in the suction duct and the yarn splicing operation is being performed in one of the winding units, the second yarn is captured by the second capturing device in the other winding units that require the yarn splicing operation.

6. The yarn winding machine according to any one of claims 1 to 5, wherein when the suction airflow by the blower is generated again in the suction duct, the first capturing device and the second capturing device perform a delivery operation to deliver the yarn piece to the suction duct.

7. a detection device for detecting defects in the yarn; a reversing device that rotates the package in a direction opposite to the winding direction, 7. The yarn winding machine according to claim 1, wherein, when the length of the yarn defect detected by the detection device is longer than a predetermined length in a state in which the suction airflow by the blower is no longer generated in the suction duct, the reversing device rotates the package by an amount of rotation that is smaller than an amount of rotation of the package in the reverse direction that is necessary to remove the defect, and then stops the rotation of the package.

8. an operating unit that switches between a first state in which the suction airflow by the blower is generated in the suction duct and a second state in which the suction airflow by the blower is not generated in the suction duct, The yarn winding machine according to any one of claims 1 to 7, wherein when the operation unit is operated to switch to the second state, the suction airflow is immediately no longer generated in the suction duct.

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