Spinning machine

Abstract

To provide a spinning machine capable of suppressing an increase in cycle time while securing a success rate of catching a yarn end in a yarn splicing process.SOLUTION: The spinning machine (1) includes a spinning device (22), a winding device (25), a yarn accumulating device (23), a yarn joining device (82), a suction device (24), and a control device (27). The spinning device generates a yarn (5) by spinning a fiber bundle and supplies the yarn. The winding device forms a package (7) by winding the yarn around a yarn winding tube (7a) supplied from the spinning device. The yarn accumulating device is arranged in a yarn path formed between the spinning device and the winding device, and accumulates the yarn supplied by the spinning device. The control device controls rotation of the winding device and rotation of the yarn accumulating device. When the yarn is cut between the spinning device and the winding device, the control device executes a first process of setting the rotation speed of the winding tube from a first speed (V1) to a second speed (V2) that is lower than the first speed and that is set based on information relating to the thickness of the yarn.SELECTED DRAWING: Figure 11

Description

[Technical Field]

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

[0002] A known spinning machine temporarily stores a supplied yarn in a yarn storage device, and then winds the yarn onto a take-up tube (bobbin) in a winding device to form a package. Patent Document 1 discloses this type of spinning machine.

[0003] In the spinning machine of Patent Document 1, the yarn pooling device includes a yarn pooling roller. The yarn pooling device can temporarily pool the yarn wound around the outer peripheral surface of the yarn pooling roller. The spinning machine performs a yarn splicing process when the yarn is broken. In the yarn splicing process, a suction device provided downstream of the yarn pooling roller captures the end of the yarn unwound from the yarn pooling roller. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-189204 Summary of the Invention [Problem to be solved by the invention]

[0005] The thicker the yarn, the smaller the amount of yarn stored in the yarn storage device. Therefore, if a thick yarn is cut, driving the take-up tube at the same rotational speed as for a thin yarn shortens the time it takes for all of the stored yarn to be unwound from the yarn storage device. As a result, the suction device may not be ready to capture the yarn end in time, and the yarn may not be captured. On the other hand, if the take-up tube is always driven at a rotational speed that can reliably capture a thick yarn, the cycle time will be longer for a thin yarn. Thus, there is room for improvement in controlling the rotational speed of the take-up tube during the yarn splicing process.

[0006] An object of the present invention is to provide a spinning machine that can prevent the cycle time from becoming long while ensuring a high success rate of capturing a yarn end in a yarn joining process. [Means for solving the problem]

[0007] Below, several aspects will be described as means for solving the problems. These aspects can be arbitrarily combined as necessary.

[0008] The spinning machine includes a spinning device, a winding device, a yarn storage device, a yarn joining device, a suction device, and a control device. The spinning device spins a fiber bundle to produce a yarn and supplies the yarn. The winding device winds the yarn supplied from the spinning device onto a rotating take-up tube to form a package. The yarn storage device is disposed on a yarn path formed between the spinning device and the winding device and stores the yarn supplied by the spinning device. The yarn joining device joins the yarn on the package side with the yarn on the spinning device. The suction device is disposed downstream of the yarn storage device and upstream of the yarn joining device and sucks and captures the yarn on the package side. The control device controls the rotation of the winding device and the yarn storage device. When the yarn is broken between the spinning device and the winding device, the control device executes a first process to change the rotation speed of the take-up tube from a first speed to a second speed that is slower than the first speed and set based on information about the yarn thickness.

[0009] This spinning machine can ensure a sufficient time between when the yarn is cut and when it is ready to catch the yarn, even when the yarn is thick, and can therefore ensure a high success rate of catching the yarn end during the yarn joining process. Furthermore, by setting the rotation speed for thin yarns differently from that for thick yarns, the cycle time is prevented from becoming long. Therefore, this spinning machine can prevent the cycle time from becoming long while ensuring a high success rate of catching the yarn end during the yarn joining process.

[0010] The spinning machine further includes a first detection unit that detects the amount of yarn stored in the yarn storage device. The control device determines whether the yarn is equal to or greater than a predetermined threshold thickness based on information about the yarn thickness. If the yarn thickness is equal to or greater than the predetermined threshold thickness, the control device executes a second process in which the rotation speed of the winding tube is changed from a second speed to a third speed that is slower than the second speed and set based on the information about the yarn thickness when the first detection unit detects that the stored amount is less than a predetermined second stored amount after executing the first process. The control device stops rotation of the winding tube when the first detection unit detects that the stored amount is less than a predetermined second stored amount, which is less than the first stored amount, after executing the second process. Furthermore, if the yarn thickness is less than the threshold thickness, the control device stops rotation of the winding tube when the first detection unit detects that the stored amount is less than the second stored amount after executing the first process.

[0011] In this spinning machine, when the yarn is equal to or larger than a threshold thickness (i.e., thick), the rotation speed is gradually reduced in accordance with the decrease in the amount of yarn stored on the take-up tube. Therefore, this spinning machine can more effectively prevent the cycle time from becoming longer while ensuring the success rate of capturing the yarn end in the yarn joining process.

[0012] The spinning machine further includes a first detection unit that detects the amount of yarn stored in the yarn storage device. After the first process is performed, if the first detection unit detects that the stored amount is less than a predetermined first stored amount, the control device changes the rotation speed of the take up tube from the second speed to a third speed that is slower than the second speed and is set based on information about the yarn thickness.

[0013] In this spinning machine, the rotation speed is gradually reduced in accordance with the decrease in the amount of yarn stored on the take-up tube, so that the spinning machine can more effectively prevent the cycle time from becoming longer while ensuring a high success rate in capturing the yarn end during the yarn splicing process.

[0014] The yarn storage device has a yarn storage roller that can store the yarn by winding it around its outer periphery. When the yarn is cut between the spinning device and the winding device, the control device changes the rotation speed of the yarn storage roller from the fourth speed to a fifth speed that is slower than the fourth speed and is set based on information about the thickness of the yarn.

[0015] In this spinning machine, the difference in rotation speed between the yarn pooling roller and the winding tube can be set within an appropriate range, thereby preventing twisting of the yarn between the yarn pooling device and the winding device.

[0016] The yarn storage device further includes a yarn acting member that acts on the yarn to reduce the amount of yarn stored in the yarn storage roller based on rotation of the yarn storage roller. The control device reduces the rotational speed of the take up tube to a sixth speed just before the yarn acting member acts on the yarn.

[0017] In this spinning machine, the difference in rotational speed between the yarn pooling roller and the winding tube when the yarn acting member acts on the yarn can be kept within an appropriate range. This prevents the yarn tension from increasing between the yarn pooling device and the winding device. Therefore, this spinning machine prevents the yarn from being broken between the yarn pooling device and the winding device. Furthermore, this spinning machine allows the suction device to easily capture the yarn.

[0018] The spinning machine further includes a second detector that detects the tension of the yarn. The control device sets at least one of the fifth speed and the sixth speed based on information about the thickness of the yarn and the tension detected by the second detector.

[0019] In this spinning machine, at least one of the fifth speed and the sixth speed is set based on the tension. Generally, a yarn with high tension has high rigidity and is difficult to bend. If the yarn tension is high, the suction device may fail to capture the yarn. Therefore, by setting at least one of the fifth speed and the sixth speed based on the information about the yarn thickness and the tension, the suction device can more easily capture the yarn.

[0020] The spinning machine includes an operation unit that receives yarn count information. The control device uses the count information received by the operation unit as information related to the thickness of the yarn.

[0021] The control device uses the detection result of the yarn monitoring device as information about the yarn thickness.

[0022] In this spinning machine, an operator does not need to provide yarn count information to the operation unit, so that the spinning machine can more effectively prevent the cycle time from becoming longer.

[0023] The information regarding the thickness of the thread is whether the thread count is Ne15 or less. [Effects of the Invention]

[0024] According to the spinning machine of the present invention, the cycle time can be shortened without reducing the success rate of capturing the yarn end in the yarn joining process. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a front view showing the overall configuration of a spinning machine according to an embodiment of the present invention; [Figure 2] FIG. 2 is a side view showing a spinning unit in the spinning machine. [Figure 3] FIG. 10 is a side view showing a state in which a breakage of a spun yarn occurs in the spinning unit. [Figure 4] 10 is a side view showing how the yarn removal lever moves from the standby position to the yarn removal position during the fixed capture yarn joining process, the spun yarn remaining on the yarn storage roller is unwound, and the slackened spun yarn is sucked into the suction device. FIG. [Figure 5] 10 is a side view showing a state in which the yarn end of the spun yarn on the package side has come off the yarn pooling roller and been captured by the suction device, and the spun yarn on the package side is ready to be taken in by the yarn splicing device of the yarn splicing cart. FIG. [Figure 6] 6 is a side view showing a state in which the spinning device has started yarn discharge spinning from the state in FIG. 5, and the spun yarn from the spinning device has been guided to the yarn joining device by a suction pipe. [Figure 7] 10 is a side view showing how, after transition from yarn discharge spinning to normal spinning, the yarn removal lever is set to the yarn removal position and the spun yarn remaining on the yarn storage roller during yarn discharge spinning is unwound. FIG. [Figure 8] FIG. 10 is a side view showing a state in which the yarn removal lever is in the standby position and yarn splicing is being performed by the yarn splicing device. [Figure 9] FIG. 10 is a side view showing how, during the moving capture yarn joining process, the spun yarn on the package side is captured by the suction mouth, and the spun yarn on the spinning device side is captured by the suction pipe, and both are guided to the yarn joining device for yarn joining. [Figure 10] FIG. 5 is a schematic diagram showing the positions of a first sensor 56a and a second sensor 56b. [Figure 11] 10 is a flowchart of rotation speed control when thread is cut. [Figure 12] 10 is an image diagram of a table in which the speeds corresponding to the counts of spun yarn 5 are recorded. [Figure 13] 5 is a time chart showing the rotation speed of each part in the rotation speed control at the time of yarn cutting. [Figure 14] 10 is a flowchart of rotation speed control at the time of yarn cutting, which is executed by a unit control section 28 of a spinning machine 1 according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] 1. First embodiment (1) Overall structure A spinning machine 1 according to one embodiment of the present invention will be described with reference to the drawings. In the following description, "upstream" and "downstream" respectively refer to the upstream and downstream in the running direction (yarn running direction) of the spun yarn 5, sliver 4a, or fiber bundle 4b when the spun yarn 5 (yarn) is being wound. "Front" and "rear" refer to the near side and the far side (the near side and the far side in FIG. 1) when facing the spinning machine 1 from the front of the spinning machine 1.

[0027] As shown in Fig. 1, the spinning machine 1 includes a blower box 111, a control box 112, a plurality of spinning units 2, and a yarn splicing cart 80. The plurality of spinning units 2 are arranged side by side in a predetermined direction. Each spinning unit 2 performs spinning using a spinning device 22 (described later) and the like. In this embodiment, the spinning machine 1 is configured as an air spinning machine.

[0028] A blower 113 that functions as a negative pressure source and the like are disposed in the blower box 111. The blower 113 is controlled by a central control device 115, which will be described later.

[0029] The control box 112 has a central control unit 115, a display unit 116, and an operation unit 117 arranged therein.

[0030] The central control device 115 centrally manages and controls each part of the spinning machine 1. The central control device 115 is connected to a unit control device 28 (control device) provided in each spinning unit 2 as shown in FIG. 2 via a signal line (not shown). In this embodiment, each spinning unit 2 is provided with a unit control device 28, but a predetermined number (for example, two or four) of spinning units 2 may share one unit control device 28. The central control device 115 is configured by a known computer having a CPU, ROM, RAM, etc. (not shown).

[0031] The display unit 116 can display settings for the spinning units 2 and / or information about the status of each spinning unit 2. The operation unit 117 is operated by an operator to set the spinning machine 1 and / or to select information to be displayed on the display unit 116. The operation unit 117 transmits the received information to the unit control unit 28 as appropriate. The display unit 116 and the operation unit 117 may be configured as touch panel displays.

[0032] As shown in FIG. 1, the spinning machine 1 is provided with a rail 101. The rail 101 is arranged to extend in the direction in which the multiple spinning units 2 are lined up. The yarn splicing cart 80 is configured to be able to run on the rail 101. This allows the yarn splicing cart 80 to move relative to the multiple spinning units 2. Although one yarn splicing cart 80 is shown in FIG. 1, the spinning machine 1 may be provided with multiple yarn splicing carts 80.

[0033] (2) Detailed configuration (2-1) Spinning Unit 2 2, each spinning unit 2 includes a draft device 21, a spinning device 22, a yarn pooling device 23, a suction device 24, a winding device 25, a yarn monitoring device 26, a spinning sensor 27 (second detection unit), and a unit control unit 28. These devices are arranged in this order from upstream to downstream in the running direction of the spun yarn 5, etc.

[0034] (2-1-1) Draft device 21 The draft device 21 is provided above the spinning machine 1 and the spinning unit 2. The draft device 21 includes a plurality of draft roller pairs. Each draft roller pair is made up of two draft rollers.

[0035] Specifically, the draft device 21 includes four draft roller pairs. The four draft roller pairs are, arranged in this order from upstream to downstream, a back roller pair 41, a third roller pair 42, a middle roller pair 43, and a front roller pair 44. An apron belt 45 is provided on each draft roller of the middle roller pair 43.

[0036] Each of the four draft roller pairs has a drive roller and a driven roller facing each other. A drive source, such as a motor (not shown), is provided for each drive roller of the four draft roller pairs. Each drive roller is driven and rotated around its axis by the drive source. The driven roller of each draft roller pair is rotatable around its axis via a bearing (not shown) or the like. The drive sources for the draft roller pairs are controlled by the unit control unit 28.

[0037] The draft device 21 sandwiches and conveys the sliver 4a supplied from the sliver supply unit 20 between the draft rollers of each draft roller pair (between a drive roller and a driven roller), thereby stretching (drafting) the sliver 4a to a predetermined fiber amount (or thickness) and generating a fiber bundle 4b. The fiber bundle 4b generated by the draft device 21 is supplied to the spinning device 22.

[0038] The sliver supplying section 20 is arranged upstream of the drafting device 21. In the sliver supplying section 20, cans that are containers for accommodating the sliver 4a are arranged.

[0039] (2-1-2) Spinning device 22 The spinning device 22 spins the fiber bundle 4b to produce a spun yarn 5, and supplies the spun yarn 5. More specifically, in this embodiment, the spinning device 22 is configured as an air spinning device. The spinning device 22 applies a swirling air flow to the fiber bundle 4b (drafted sliver 4a) produced by the draft device 21 to add twist and spin the fiber bundle 4b, thereby producing the spun yarn 5. The spinning device 22 is disposed downstream of the draft device 21. The spun yarn 5 produced by the spinning device 22 is supplied to the yarn storage device 23.

[0040] (2-1-3) Yarn storage device 23 The yarn pooling device 23 is disposed on a yarn path formed between the spinning device 22 and the winding device 25, and temporarily pools the spun yarn 5 supplied by the spinning device 22.

[0041] The yarn pooling device 23 includes a yarn pooling roller 51, an electric motor 52, a yarn hooking member 53, a guide 54, a yarn removal lever 55 (yarn acting member), and a pooled yarn amount detection sensor 56 (first detection unit).

[0042] The yarn pooling roller 51 is driven to rotate by an electric motor 52. The yarn pooling roller 51 winds the spun yarn 5 around its outer periphery and temporarily stores it. By rotating at a predetermined rotational speed with the spun yarn 5 wound around its outer periphery, the yarn pooling roller 51 can pull out the spun yarn 5 from the spinning device 22 at a predetermined speed. The electric motor 52 is controlled by the unit control unit 28.

[0043] The yarn hooking member 53 can hook the spun yarn 5. The yarn hooking member 53 rotates integrally with the yarn pooling roller 51 with the spun yarn 5 hooked thereon, thereby guiding the spun yarn 5 to the outer peripheral surface of the yarn pooling roller 51.

[0044] Hereinafter, the rotation of the yarn pooling roller 51 in the direction in which the spun yarn 5 is drawn out from the spinning device 22 may be referred to as "forward rotation," and the rotation in the opposite direction may be referred to as "reverse rotation." Regarding the yarn hooking member 53, the rotation in the same direction as the yarn pooling roller 51 may be referred to as "forward rotation," and the rotation in the opposite direction may be referred to as "reverse rotation." Normally, the yarn pooling roller 51 and the yarn hooking member 53 are driven in the forward rotation direction.

[0045] The yarn removal lever 55 acts on the spun yarn 5 to reduce the amount of yarn stored in the yarn storage roller 51 based on the rotation of the yarn storage roller 51. The yarn removal lever 55 is located near the yarn storage roller 51. The yarn removal lever 55 can perform a yarn removal operation to remove the spun yarn 5 from the yarn hooking member 53. As shown in FIG. 1, the yarn removal lever 55 is configured as an L-shaped member, and one end of the lever is rotatably supported.

[0046] The yarn removing lever 55 is provided so as to be movable between a standby position P1 and a yarn removing position P2. Figure 2 shows the state in which the yarn removing lever 55 is at the standby position P1. In the process of moving from the standby position P1 to the yarn removing position P2, the yarn removing lever 55 passes through the space downstream of the yarn pooling roller 51. At this time, if there is a spun yarn 5 caught on the yarn hooking member 53, the yarn removing lever 55 acts on the spun yarn 5, causing the spun yarn 5 to be released from the yarn hooking member 53. The state in which the yarn removing lever 55 is at the yarn removing position P2 is shown in Figures 4 and 7.

[0047] In this embodiment, the yarn removing lever 55 is provided in each spinning unit 2, and an independent drive unit (motor, air cylinder, etc.) is provided for each yarn removing lever 55. Therefore, the yarn removing lever 55 can operate independently of the yarn removing levers 55 of the other spinning units 2. The drive unit of the yarn removing lever 55 is controlled by the unit control unit 28.

[0048] The guide 54 is disposed downstream of the yarn pooling roller 51. The guide 54 regulates the trajectory of the spun yarn 5 swung by the rotating yarn hooking member 53, and stabilizes the yarn path along which the spun yarn 5 travels downstream of the guide 54 (on the winding device 25 side), thereby guiding the spun yarn 5. The guide 54 is disposed downstream of the yarn removal lever 55.

[0049] The yarn storage amount detection sensor 56 can detect the storage amount S of the spun yarn 5 in the yarn storage device 23 (more specifically, the yarn storage roller 51). The yarn storage amount detection sensor 56 has a first sensor 56a and a second sensor 56b. The first sensor 56a detects whether the storage amount S in the yarn storage roller 51 is equal to or greater than a predetermined first storage amount S1. The second sensor 56b detects whether the storage amount S in the yarn storage roller 51 is equal to or greater than a predetermined second storage amount S2 that is smaller than the first storage amount S1. The yarn storage amount detection sensor 56 transmits the detection result to the unit control unit 28.

[0050] The first sensor 56a is positioned to face the position of the spun yarn 5 on the outer peripheral surface of the yarn storage roller 51 when the storage amount S becomes the first storage amount S1. The second sensor 56b is positioned to face the position of the spun yarn 5 on the outer peripheral surface of the yarn storage roller 51 when the storage amount S becomes the second storage amount S2. The first sensor 56a and the second sensor 56b detect that the spun yarn 5 has reached the outer peripheral surface of the opposing yarn storage roller 51. Figure 10 is a schematic diagram showing the positions of the first sensor 56a and the second sensor 56b.

[0051] The first sensor 56a and the second sensor 56b transmit the detection results to the unit control section 28. Based on the detection results, the unit control section 28 can detect whether the storage amount S is equal to or greater than a predetermined amount.

[0052] The yarn pooling device 23 can temporarily pool the spun yarn 5 on the outer peripheral surface of the yarn pooling roller 51, and therefore functions as a kind of buffer for the spun yarn 5. This can eliminate problems (such as slack in the spun yarn 5) caused by a mismatch between the spinning speed in the spinning device 22 and the winding speed (the running speed of the spun yarn 5 wound into the package 7, which will be described later) for some reason.

[0053] (2-1-4) Suction device 24 When the spun yarn 5 is cut between the spinning device 22 and the winding device 25, the suction device 24 can suck the spun yarn 5 on the winding device 25 side. The suction device 24 is provided between the yarn pooling device 23 and the winding device 25. In this embodiment, the suction device 24 is provided fixedly, but it may also be provided to be somewhat movable. For example, the suction device 24 may be provided to be movable slightly toward and away from the yarn path.

[0054] The suction device 24 includes a suction pipe 61. The suction pipe 61 has a suction port 62 formed at its tip (one longitudinal end). The suction port 62 opens toward the middle of the yarn path. The suction pipe 61 is connected to a negative pressure source such as a blower 113 via piping or the like. This generates a suction airflow in the suction port 62 (inside the suction pipe 61). Unlike a suction mouth 84 described below, the suction pipe 61 is fixedly provided to the spinning unit 2. Therefore, the position of the suction port 62 is constant.

[0055] In this embodiment, the suction device 24 includes a shutter 63. The shutter 63 changes the state of the suction device 24 between a suction state and a suction stop state. The shutter 63 is disposed, for example, between the suction port 62 and a portion of the suction device 24 that is downstream of the suction pipe 61 in the air flow direction. The shutter 63 can be configured, for example, by an opening / closing mechanism having a plate-like member. The shutter 63 is controlled by the unit control unit 28. Opening the shutter 63 only when necessary achieves energy conservation in the spinning machine 1. Note that the suction device 24 does not necessarily have to include the shutter 63.

[0056] The suction device 24 is equipped with a yarn capture detection sensor 64. The yarn capture detection sensor 64 can detect whether the suction device 24 has successfully captured the spun yarn 5 on the winding device 25 side. In this embodiment, the yarn capture detection sensor 64 is disposed immediately downstream of the suction port 62 of the suction device 24. The yarn capture detection sensor 64 detects the presence or absence of the spun yarn 5 immediately downstream of the suction device 24, and transmits the detection result to the unit control unit 28. The yarn capture detection sensor 64 may be provided inside the suction pipe 61.

[0057] (2-1-5) Winding device 25 The winding device 25 winds the spun yarn 5 supplied from the spinning device 22 onto a rotating winding tube 7a to form a package 7. The winding device 25 is disposed downstream of the yarn storage device 23.

[0058] The winding device 25 includes a cradle device 71 , a package rotating device 72 , and a traverse device 73 .

[0059] The cradle device 71 includes a pair of cradle arms 74. The cradle device 71 can rotatably support a winding tube 7a (and thus a package 7) for winding the spun yarn 5 between the pair of cradle arms 74. The cradle arms 74 can rotate about a support shaft 75.

[0060] The package rotation device 72 includes a winding drum 76 and a drum drive motor 77. The winding drum 76 can come into contact with the outer peripheral surface of the winding tube 7a or the package 7. The output shaft of the drum drive motor 77 is connected to the winding drum 76 by appropriate means (for example, a belt). By driving the winding drum 76 with the drum drive motor 77, the winding tube 7a and the package 7 can be rotated in the direction in which the spun yarn 5 is wound. The drum drive motor 77 is configured to be rotatable forward and reverse. Therefore, the drum drive motor 77 can also rotate the winding tube 7a and the package 7 in the direction opposite to the direction in which the spun yarn 5 is wound. The drum drive motor 77 is controlled by the unit control unit 28.

[0061] The traverse device 73 includes a yarn guide 78 and a traverse drive motor 79. The yarn guide 78 can hook the spun yarn 5 to be wound onto the package 7. The yarn guide 78 can move back and forth in the winding width direction of the package 7. The output shaft of the traverse drive motor 79 is connected to the yarn guide 78 by appropriate means (for example, a belt and pulley, etc.). With the yarn guide 78 holding the spun yarn 5, the spun yarn 5 to be wound onto the package 7 can be traversed by driving the yarn guide 78 back and forth using the traverse drive motor 79. The traverse drive motor 79 is controlled by the unit control unit 28.

[0062] The winding device 25 rotates the winding drum 76 of the package rotation device 72 while reciprocating the yarn guide 78 of the traverse device 73. This allows the winding device 25 to wind the spun yarn 5 onto the winding tube 7a while traversing.

[0063] (2-1-6) Yarn monitoring device 26 The yarn monitoring device 26 detects the state of the spun yarn 5 before it is stored in the yarn storage device 23 and the thickness T (diameter of the spun yarn 5) of the spun yarn 5. The yarn monitoring device 26 is provided between the spinning device 22 and the spinning sensor 27. As a result, the spun yarn 5 produced by the spinning device 22 passes through the yarn monitoring device 26 before passing through the spinning sensor 27.

[0064] The yarn monitoring device 26 monitors the traveling spun yarn 5 with an optical sensor, and detects yarn defects in the spun yarn 5, breaks in the spun yarn 5, and the thickness T of the spun yarn 5. Yarn defects include, for example, an abnormality in the thickness T of the spun yarn 5 and / or foreign matter in the spun yarn 5. When the yarn monitoring device 26 detects a yarn defect in the spun yarn 5 or a break (break) in the spun yarn 5 for some reason, it transmits the yarn defect detection result to the unit control unit 28. The yarn monitoring device 26 also transmits the detected thickness T of the spun yarn 5 to the unit control unit 28.

[0065] The yarn monitoring device 26 may use, for example, a capacitance sensor instead of an optical sensor to monitor the quality of the spun yarn 5. The yarn monitoring device 26 may be configured to detect abnormalities in the tension of the spun yarn 5 instead of or in addition to these yarn defects.

[0066] (2-1-7) Spinning Sensor 27 The spinning sensor 27 detects the tension of the spun yarn 5. The spinning sensor 27 is provided between the yarn monitoring device 26 and the yarn pooling device 23. The spun yarn 5 that has passed through the yarn monitoring device 26 passes the spinning sensor 27 before being pooled in the yarn pooling device 23. The spinning sensor 27 transmits the detected tension of the spun yarn 5 to the unit control unit 28.

[0067] (2-1-8) Unit control unit 28 The unit control unit 28 centrally manages and controls each part of the spinning unit 2, and realizes the operation of the spinning unit 2 described later in cooperation with the central control device 115 and a carriage control unit 85 described later. The unit control unit 28 is connected to each part of the spinning unit 2 via signal lines (not shown). The unit control unit 28 is configured by a known computer having a CPU, ROM, RAM, etc. (not shown). The unit control unit 28 controls the rotation of the winding device 25 and the rotation of the yarn storage device 23, and executes "rotational speed control at yarn cutting" described later.

[0068] (2-2) Yarn splicing cart 80 When a break in the spun yarn 5 occurs in any of the spinning units 2, the yarn splicing cart 80, in response to a command from the unit control unit 28, travels to the working position corresponding to the spinning unit 2 where the break in the spun yarn 5 occurred, and performs a yarn splicing in that spinning unit 2. The yarn splicing cart 80 waits at an appropriate position on the rail 101 until a break in the spun yarn 5 occurs. As will be described in detail later, the yarn splicing cart 80 performs this yarn splicing in cooperation with the suction device 24 or the like provided in the spinning unit 2, or by using a device provided in the yarn splicing cart 80 (such as the suction mouth 84 described later).

[0069] The yarn splicing carriage 80 includes traveling wheels 81, a yarn splicing device 82, a suction pipe 83, a suction mouth 84, and a carriage control unit 85.

[0070] (2-2-1) Running wheel 81 The traveling wheels 81 are configured to be rotatably driven by a driving means (e.g., a motor) not shown. Driving the traveling wheels 81 allows the yarn splicing carriage 80 to travel relative to each of the multiple spinning units 2. The driving means of the traveling wheels 81 is controlled by a carriage control unit 85.

[0071] (2-2-2) Suction pipe 83 The suction pipe 83 is a member having a pipe-shaped portion. An opening is formed at the tip 88 of the suction pipe 83. The suction pipe 83 is connected to a negative pressure source such as a blower 113. This causes a suction airflow to be generated at the opening at the tip 88 of the suction pipe 83. The suction pipe 83 is supported rotatably. As the suction pipe 83 rotates, the tip 88 can move closer to or retract from the spinning device 22. If the spun yarn 5 is broken, the suction pipe 83 can suck in and capture the spun yarn 5 on the spinning device 22 side from the tip 88 at a position close to the spinning device 22.

[0072] (2-2-3) Suction Mouse 84 The suction mouth 84 is a member having a pipe-shaped portion. An opening is formed at the tip 89 of the suction mouth 84. The suction mouth 84 is connected to a negative pressure source such as a blower 113. This causes the suction mouth 84 to generate a suction airflow at the opening at the tip 89. The suction mouth 84 is supported rotatably. By rotating the suction mouth 84, the tip 89 can be moved to a position closer to the winding device 25 or a retracted position. If the spun yarn 5 is broken, the suction mouth 84 can suck in and capture the spun yarn 5 on the winding device 25 side from the tip 89 when it is close to the winding device 25.

[0073] (2-2-4) Yarn joining device 82 After the spun yarn 5 is broken, the yarn splicing device 82 splices the spun yarn 5 on the spinning device 22 side captured by the suction pipe 83 with the spun yarn 5 on the winding device 25 side captured by the suction device 24 or suction mouth 84. In this embodiment, the yarn splicing device 82 is a splicer device that twists yarn ends together using a swirling airflow. The yarn splicing device 82 is not limited to the splicer device described above, and may be, for example, a mechanical knotter. The yarn splicing device 82 is controlled by a carriage control unit 85.

[0074] The yarn joining device 82 is equipped with a yarn shifting lever (not shown). The spun yarn 5 captured by the suction device 24 is taken into the yarn joining device 82 by operating the yarn shifting lever. The yarn joining device 82 may be configured to be movable in a direction approaching or retracting from the yarn path.

[0075] When the yarn splicing cart 80 travels to the working position, the yarn splicing device 82 is located downstream of the suction device 24 of the spinning unit 2 that is the target of the yarn splicing. Furthermore, when the tip 89 of the suction mouth 84 is retracted from the winding device 25 (the state shown by the solid line in FIG. 9 ), the yarn splicing device 82 is located downstream of the tip 89 of the suction mouth 84.

[0076] (2-2-5) Truck control unit 85 The carriage control unit 85 centrally manages and controls each part of the yarn splicing carriage 80, and performs yarn splicing in cooperation with the central control device 115 and the unit control unit 28. As will be described in detail later, when the carriage control unit 85 receives a yarn splicing request sent by the unit control unit 28, it controls each part of the yarn splicing carriage 80 so that the carriage travels to the work position corresponding to the spinning unit 2 that sent the yarn splicing request and performs yarn splicing in that spinning unit 2. The carriage control unit 85 is connected to each part of the spinning unit 2 via signal lines (not shown). The carriage control unit 85 is configured by a known computer having a CPU, ROM, RAM, etc. (not shown).

[0077] (3) Yarn splicing (3-1) Overview of yarn joining process The spinning unit 2 performs a yarn joining process when the spun yarn 5 is cut. The spinning unit 2 performs either a "fixed capture yarn joining process" or a "moving capture yarn joining process" as the yarn joining process.

[0078] In the fixed capture yarn joining process, as shown in Fig. 8, the suction device 24 captures the spun yarn 5 on the winding device 25 side. The suction device 24 prepares the captured spun yarn 5 so that it can be taken in by the yarn joining device 82. After that, the yarn joining device 82, which has taken in the spun yarn 5, performs yarn joining. The detailed operation of each part in the fixed capture yarn joining process will be described later.

[0079] In the mobile capturing and joining process, as shown in Fig. 9, the suction mouth 84 captures the spun yarn 5 on the winding device 25 side. The suction mouth 84 guides the captured spun yarn 5 so that it can be taken in by the yarn joining device 82. After that, the yarn joining device 82, which has taken in the spun yarn 5, performs the yarn joining. The detailed operation of each part in the mobile capturing and joining process will be described later.

[0080] In either process, the spun yarn 5 on the spinning device 22 side is captured by the suction pipe 83, and the suction pipe 83 guides the spun yarn 5 so that the yarn joining device 82 can take in the spun yarn 5.

[0081] When the spun yarn 5 is cut, the unit control unit 28 determines whether to perform the fixed capture yarn joining process or the mobile capture yarn joining process based on the storage amount S of the spun yarn 5 on the yarn storage roller 51. Specifically, when the spun yarn 5 is cut, the unit control unit 28 determines to perform the fixed capture yarn joining process if the storage amount S of the spun yarn 5 on the yarn storage roller 51 is equal to or greater than a predetermined amount, and determines to perform the mobile capture yarn joining process if the storage amount S on the yarn storage roller 51 is less than the predetermined amount.

[0082] Unlike the mobile capture yarn joining process, the fixed capture yarn joining process does not require the guiding operation of the suction mouth 84. Therefore, in terms of energy conservation, it is preferable to always perform the fixed capture yarn joining process. On the other hand, if the fixed capture yarn joining process is performed when the amount S of spun yarn 5 stored on the yarn storage roller 51 is small, there is a risk that the suction device 24 will not be able to capture the spun yarn 5 in time.

[0083] Therefore, by determining whether to perform the fixed capture yarn joining process or the mobile capture yarn joining process based on the amount S of spun yarn 5 stored in the yarn storage roller 51, it is possible to achieve both energy savings and reliable capture of the spun yarn 5 during the yarn joining process.

[0084] The above description of the determination of whether to perform the fixed capture yarn joining process or the mobile capture yarn joining process is merely an example, and the determination may be made based on other criteria.

[0085] The above-mentioned "when the spun yarn 5 is cut" includes a case where the yarn monitoring device 26 detects a yarn defect in the spun yarn 5 and the spinning unit 2 cuts the spun yarn 5 to remove the defect, and a case where the spun yarn 5 is cut for some reason. The yarn monitoring device 26 detects that the spun yarn 5 has been cut.

[0086] When the yarn monitoring device 26 detects a yarn defect in the spun yarn 5, the unit control unit 28 determines whether or not to cut the spun yarn 5 to remove the defect. The spun yarn 5 is cut by stopping spinning by the spinning device 22. Cutting of the spun yarn 5 is not limited to this method, and may be achieved by stopping drafting by the draft device 21 (for example, rotation of the back roller pair 41), or by cutting the spun yarn 5 with a cutter provided in the spinning unit 2.

[0087] (3-2) Details of yarn joining process The following describes the details of the yarn joining process using as an example a case where the yarn monitoring device 26 detects a yarn defect in the spun yarn 5 and the spinning unit 2 cuts the spun yarn 5 to remove the defect. When the yarn monitoring device 26 detects a yarn defect in the spun yarn 5 and the spinning device 22 stops spinning, the spun yarn 5 is cut between the spinning device 22 and the yarn storage device 23, as shown in FIG. 3 .

[0088] At an appropriate timing after the yarn monitoring device 26 detects that the spun yarn 5 has been cut, the unit control unit 28 transmits a yarn joining request to the carriage control unit 85. The carriage control unit 85, which has received the yarn joining request, causes the yarn joining carriage 80 to travel to the spinning unit 2 where the spun yarn 5 has been cut. Furthermore, at an appropriate timing after the yarn monitoring device 26 detects that the spun yarn 5 has been cut, the unit control unit 28 determines whether to perform the fixed capture yarn joining process or the mobile capture yarn joining process based on the amount S of spun yarn 5 stored in the yarn storage roller 51.

[0089] (3-2-1) Fixed capture yarn joining process When the fixed capture yarn joining process is started, the unit control section 28 starts the "rotation speed control at yarn breakage." By executing the rotation speed control at yarn breakage, the speed at which the spun yarn 5 on the winding device 25 passes through the suction device 24 decreases, making it easier for the suction device 24 to capture the yarn. The rotation speed control at yarn breakage will be described in detail later.

[0090] As winding by the winding device 25 progresses due to the rotation of the winding tube 7a, the amount S of spun yarn 5 stored on the yarn storage roller 51 decreases. At this time, the yarn removal lever 55 is stationary at the standby position P1, as shown in Figure 3. This causes the yarn hooking member 53 to come into contact with the spun yarn 5 being unwound from the yarn storage roller 51 and apply tension to it.

[0091] After a predetermined time has elapsed since the second sensor 56b detected that the storage amount S of the spun yarn 5 has become equal to or less than the second storage amount S2, the yarn removal lever 55 moves to the yarn removal position P2, as shown in Fig. 4. This changes the yarn path of the spun yarn 5 unwound from the yarn storage roller 51, and the spun yarn 5 is removed from the yarn hooking member 53.

[0092] Almost simultaneously with the movement of the yarn removing lever 55 to the yarn removing position P2, the shutter 63 opens and the suction device 24 starts suction. Almost simultaneously with the start of suction by the suction device 24, the take up tube 7a stops rotating. The suction by the suction device 24 may start before the start of movement of the yarn removing lever 55 to the yarn removing position P2.

[0093] At this time, the yarn pooling roller 51 continues to rotate. Furthermore, because the spun yarn 5 has been released from the yarn hooking member 53 and the rotational speed control during yarn breakage is being executed, the tension of the spun yarn 5 being unwound as the yarn pooling roller 51 rotates decreases between the yarn pooling roller 51 and the winding tube 7a. As a result, even before the yarn end of the spun yarn 5 on the winding device 25 side comes off the yarn pooling roller 51, the suction device 24 can suck in the middle of the slackened spun yarn 5, as shown in Figure 4. The unit control unit 28 determines whether the suction device 24 has successfully captured the spun yarn 5 based on the detection result of the yarn capture detection sensor 64. Note that if the detection sensitivity of the yarn capture detection sensor 64 is too high, there is a risk of false detection due to fly. Therefore, the winding tube 7a may be rotated in the reverse direction while the shutter 63 is open, or the spun yarn 5 may be moved by the traverse device 73, thereby detecting the spun yarn 5 and determining whether the suction device 24 has successfully captured the spun yarn 5.

[0094] After that, the yarn removal lever 55 returns to the standby position P1 at an appropriate timing. Also, the yarn pooling roller 51 stops rotating. Figure 5 also shows the yarn splicing cart 80 that has arrived at the spinning unit 2 in response to the yarn splicing request.

[0095] When the yarn splicing carriage 80 arrives, the suction pipe 83 moves the tip 88 to a position where it can capture the spun yarn 5 on the spinning device 22 side. Almost simultaneously, the spinning device 22 resumes supplying the spun yarn 5. The yarn pooling roller 51 and the yarn hooking member 53 also resume rotation.

[0096] 6, the suction pipe 83 guides the captured spun yarn 5 on the spinning device 22 side to the yarn joining device 82. At this time, the yarn removal lever 55 maintains the standby position P1. As a result, the spun yarn 5 pulled out from the spinning device 22 is hooked onto the yarn hooking member 53, and the rotating yarn hooking member 53 winds the spun yarn 5 around the yarn pooling roller 51.

[0097] Until a predetermined time has passed since the spun yarn 5 began to be wound around the yarn storage roller 51, the low-quality spun yarn 5 produced when spinning was first restarted remains on the yarn storage roller 51. In order to suck and discard the low-quality spun yarn 5 wound around the yarn storage roller 51 using the suction pipe 83, the yarn removal lever 55 moves to the yarn removal position P2, as shown in FIG.

[0098] After all of the spun yarn 5 to be removed has been unwound from the yarn storage roller 51, the yarn removal lever 55 moves to the standby position P1 shown in Fig. 8. As a result, the spun yarn 5 is hooked again on the yarn hooking member 53, and the amount S of spun yarn 5 stored on the yarn storage roller 51 increases.

[0099] In this state, the yarn joining device 82 performs a yarn joining between the spun yarn 5 on the winding device 25 side that has been sucked into the suction device 24 and the spun yarn 5 on the spinning device 22 side.

[0100] During yarn splicing, the excess spun yarn 5 is cut in the yarn splicing device 82. This cutting separates the portion of the yarn defect detected by the yarn monitoring device 26 from the spun yarn 5 on the winding device 25 side. The cut excess spun yarn 5 is sucked into the suction device 24 or the suction pipe 83 and discarded.

[0101] Almost simultaneously with the completion of the yarn splicing, the take up tube 7a resumes rotation in the direction of winding the spun yarn 5. The shutter 63 is closed at an appropriate timing after the completion of the yarn splicing. In this way, the spinning unit 2 returns to the normal state shown in FIG.

[0102] When the rotation speed of the winding tube 7a is reduced, the tension of the spun yarn 5 on the winding device 25 side is likely to become unstable. This makes the position at which the spun yarn 5 is guided onto the outer surface of the package 7 by the yarn guide 78 unstable, which may result in "end drop," in which the spun yarn 5 is wound at a position outside the winding width of the package 7. To prevent end drop, the traverse device 73 may narrow the traverse width when the winding tube 7a rotates to wind the spun yarn 5. For example, it is preferable to set the traverse width to no more than half the traverse width before the spun yarn 5 is cut (maximum traverse width). In this case, the traverse width continues to be reduced until the rotation of the package 7 stops. In addition to narrowing the traverse width, the traverse device 73 may also slow down the traverse speed.

[0103] Even if the suction device 24 has succeeded in capturing the spun yarn 5, if the yarn defect contained in the package 7 is long, the winding tube 7a may rotate in the direction opposite to the winding direction for a predetermined time. This allows the spun yarn 5 to be unwound from the package 7 and sucked into the suction device 24, thereby removing the yarn defect.

[0104] (3-2-2) Moving capture yarn joining process When the moving capture yarn joining process is started, the winding tube 7a continues to rotate (without decelerating). As a result, the yarn end of the spun yarn 5 on the winding device 25 side is wound onto the winding tube 7a. Furthermore, the suction device 24 keeps the shutter 63 closed if it is closed, and closes the shutter 63 if it is open. As a result, the yarn end of the spun yarn 5 on the winding device 25 side is prevented from being sucked into the suction port 62 of the suction device 24. Thereafter, the yarn end of the spun yarn 5 on the winding device 25 side moves near or to the outer peripheral surface of the package 7, and is completely wound onto the package 7. The shutter 63 may be closed at any appropriate timing.

[0105] When the yarn splicing cart 80 arrives, the suction mouth 84 brings the leading end 89 closer to the winding device 25, as shown by the chain line in Figure 9. In this state, the package rotation device 72 of the winding device 25 rotates the winding tube 7a in the direction opposite to the direction in which the spun yarn 5 is wound. This allows the suction mouth 84 to capture the spun yarn 5 on the winding device 25 side. The package 7 continues to rotate in the reverse direction until all of the spun yarn 5 on the winding device 25 side, including yarn defects, is sucked into the suction mouth 84. Once the suction mouth 84 has sucked in the portion of the spun yarn 5 including the yarn defect, it moves the leading end 89 away from the winding device 25. As a result, the spun yarn 5 on the winding device 25 side is guided to the yarn splicing device 82.

[0106] In this state, the yarn splicing device 82 splices the spun yarn 5 on the winding device 25 side, which has been sucked into the suction mouth 84, with the spun yarn 5 on the spinning device 22 side.

[0107] During yarn splicing, the excess spun yarn 5 is cut in the yarn splicing device 82. This cutting separates the portion of the yarn defect detected by the yarn monitoring device 26 from the spun yarn 5 on the winding device 25 side. The cut excess spun yarn 5 is sucked into the suction mouth 84 or suction pipe 83 and discarded.

[0108] Almost simultaneously with the completion of the yarn splicing, the take-up tube 7a resumes rotation in the winding direction. The shutter 63 is closed at an appropriate timing after the completion of the yarn splicing. In this way, the spinning unit 2 returns to the normal state shown in FIG. 2.

[0109] Before the spun yarn 5 on the winding device 25 side is completely wound onto the winding tube 7a, the rotation speed in the winding direction of the winding tube 7a may be reduced compared to before the break. This makes it easier for the yarn end of the spun yarn 5 on the winding device 25 side to separate from the spun yarn 5 on the outer circumferential surface of the package 7, allowing the suction mouth 84 to easily capture the yarn end. For the same reason, the rotation of the package 7 may be stopped immediately before the spun yarn 5 on the winding device 25 side is completely wound onto the package 7.

[0110] In the moving capture yarn splicing process, the traverse device 73 may also narrow the traverse width when the package 7 rotates to wind the spun yarn 5, and may also slow down the traverse speed. This prevents the end face from dropping, and allows the suction mouth 84 to easily capture the yarn end.

[0111] (3-3) Rotation speed control when cutting yarn (3-3-1) Control Overview In controlling the rotation speed at the time of yarn cutting, the unit control section 28 controls each section as described below.

[0112] When the spun yarn 5 is broken between the spinning device 22 and the winding device 25 (in other words, when the yarn monitoring device 26 detects that the spun yarn 5 has been broken), the unit control unit 28 executes a process to change the rotation speed Vb of the winding tube 7a from the previous first speed V1 to a second speed V2. For convenience, this process will be referred to as the first process below. The second speed V2 is slower than the first speed V1 and is set based on information about the thickness of the spun yarn 5.

[0113] The unit control unit 28 determines whether the thickness T of the spun yarn 5 is equal to or greater than a predetermined threshold thickness Tth based on the information about the thickness of the spun yarn 5. If the thickness T of the spun yarn 5 is equal to or greater than the threshold thickness Tth, after performing the first process, when the first sensor 56a of the yarn storage amount detection sensor 56 detects that the storage amount S of the spun yarn 5 in the yarn storage roller 51 is less than the predetermined first storage amount S1, the unit control unit 28 performs a process to change the rotation speed Vb of the take-up tube 7a from the previous second speed V2 to a third speed V3. For convenience, this process will be referred to as the second process below. The third speed V3 is slower than the second speed V2 and is set based on the information about the thickness of the spun yarn 5. Furthermore, after the second process is performed, the unit control unit 28 stops the rotation of the winding tube 7a when the second sensor 56b of the yarn storage amount detection sensor 56 detects that the storage amount S is less than a predetermined second storage amount S2 that is less than the first storage amount S1. Furthermore, if the thickness T of the spun yarn 5 is less than the threshold thickness Tth, the unit control unit 28 stops the rotation of the winding tube 7a when the second sensor 56b of the yarn storage amount detection sensor 56 detects that the storage amount S is less than the second storage amount S2 after the first process is performed.

[0114] When the spun yarn 5 is cut between the spinning device 22 and the winding device 25, the unit control unit 28 changes the rotation speed Vr of the yarn pooling roller 51 from the previous fourth speed V4 to a fifth speed V5. The fifth speed V5 is slower than the fourth speed V4 and is set based on information about the thickness of the spun yarn 5.

[0115] The unit control section 28 reduces the rotational speed Vb of the winding tube 7a to a sixth speed V6 when the yarn removal lever 55 acts on the spun yarn 5. More specifically, the yarn removal lever 55 is raised and the winding tube 7a is decelerated to the sixth speed V6 almost simultaneously. As a result, the winding tube 7a has already started rotating at the sixth speed V6 by the time the yarn removal lever 55 is raised and comes into contact with the spun yarn 5, and the tension of the spun yarn 5 can be reduced.

[0116] The unit control unit 28 uses the count information received by the operation unit 117 as "information regarding the thickness of the spun yarn 5." The information regarding the thickness of the spun yarn 5 is whether the count of the spun yarn 5 is Ne15 or less.

[0117] (3-3-2) Control flow Next, the control flow of the rotation speed control when the yarn is cut will be explained using a flowchart. Figure 11 is a flowchart of the rotation speed control when the yarn is cut.

[0118] The operation unit 117 receives count information and threshold thickness Tth of the spun yarn 5 and transmits them to the unit control unit 28 before starting the rotation speed control at the time of yarn cutting.

[0119] The first speed V1, second speed V2, third speed V3, fourth speed V4, and fifth speed V5 are determined in advance, for example, at the start of the spinning unit 2, based on count information of the spun yarn 5 received by the operation unit 117. Specifically, the unit control unit 28 determines the first speed V1, second speed V2, third speed V3, fourth speed V4, and fifth speed V5 by referring to a table in which the count of the spun yarn 5 is associated with each speed. FIG. 12 is an image diagram of the table in which each speed corresponding to the count of the spun yarn 5 is recorded. This table is recorded in a memory unit (not shown) of the unit control unit 28. Note that the rotation speeds shown in FIG. 12 are just an example, and the first speed V1, second speed V2, third speed V3, fourth speed V4, and fifth speed V5 are not limited to these.

[0120] 12, in this embodiment, each speed except for the first speed V1 is different when the spun yarn 5 is Ne15 or less and when the spun yarn 5 is greater than Ne15. More specifically, the second speed V2, third speed V3, and fifth speed V5 are set so that the speed of a spun yarn 5 with a smaller count (thicker) is equal to or less than the speed of a spun yarn 5 with a larger count (thinner). For convenience, the speed group when the spun yarn 5 is Ne15 or less will be referred to as group 1, and the speed group when the spun yarn 5 is greater than Ne15 will be referred to as group 2.

[0121] Before the start of the rotation speed control in case of yarn breakage, the rotation speed Vb of the take up tube 7a is the first speed V1, and the rotation speed Vr of the yarn storage roller 51 is the fourth speed V4.

[0122] The unit control section 28 starts (starts) the rotation speed control at the time of yarn cutting at the same time as the fixed capture yarn joining process starts.

[0123] In step S100, the unit control unit 28 determines whether the speed group of group 1 or group 2 will be used in subsequent processing based on information about the thickness of the spun yarn 5, and proceeds to step S110. Specifically, if the spun yarn 5 is Ne15 or less, the unit control unit 28 uses the speed group of group 1 in subsequent processing, and if the count of the spun yarn 5 is finer than Ne15, the unit control unit 28 uses the speed group of group 2 in subsequent processing.

[0124] In step S110, the unit control section 28 changes the rotation speed Vb of the winding tube 7a from the previous first speed V1 to the second speed V2, and proceeds to step S120. In other words, in step S110, the unit control section 28 executes the first process.

[0125] In step S120, the unit control section 28 changes the rotation speed Vr of the yarn storage roller 51 from the fourth speed V4 to a fifth speed V5, and then proceeds to step S130. Step S120 may be executed before step S110.

[0126] In step S130, if the thickness T of the spun yarn 5 is equal to or greater than the predetermined threshold thickness Tth (YES), the unit control unit 28 proceeds to step S130, and if the spun yarn 5 is not equal to or greater than the predetermined threshold thickness Tth (NO), the unit control unit 28 proceeds to step S160. The threshold thickness Tth is, but is not limited to, Ne15.

[0127] In step S140, if the storage amount S of the spun yarn 5 is less than the first storage amount S1 (Yes), the unit control unit 28 proceeds to step S140, and if the storage amount S of the spun yarn 5 is equal to or greater than the first storage amount S1 (No), the unit control unit 28 repeats the processing of step S130.

[0128] When the yarn is cut, the stored amount S of the spun yarn 5 may be less than the first stored amount S1. For this reason, the unit control unit 28 may execute a process similar to step S140 immediately after step S100, and determine whether to proceed to step S150.

[0129] In step S150, the unit control section 28 changes the rotation speed Vb of the winding tube 7a from the previous second speed V2 to the third speed V3, and proceeds to step S150. In other words, in step S150, the unit control section 28 executes the second process.

[0130] In step S160, if the storage amount S of the spun yarn 5 is less than the second storage amount S2 (Yes), the unit control unit 28 proceeds to step S170, and if the storage amount S of the spun yarn 5 is equal to or greater than the second storage amount S2 (No), the unit control unit 28 repeats the processing of step S160.

[0131] The unit control unit 28 may proceed to step S170 after a predetermined time has elapsed since detecting in step S160 that the stored amount S of the spun yarn 5 is less than the second stored amount S2. For example, the unit control unit 28 may proceed to step S170 after the second sensor 56b detects that the stored amount S of the spun yarn 5 has become equal to or less than the second stored amount S2, and before moving to the yarn removal position P2.

[0132] In step S170, the unit control section 28 reduces the rotational speed Vb of the take up tube 7a to a sixth speed V6 immediately before the yarn removal lever 55 acts on the spun yarn 5, and then proceeds to step S180.

[0133] Here, the time when the yarn removing lever 55 acts on the spun yarn 5 is the timing when the second sensor 56b detects that the storage amount S of the spun yarn 5 has become equal to or less than the second storage amount S2, and after a predetermined time has elapsed, the yarn removing lever 55 moves to the yarn removing position P2. Therefore, at this timing, the unit control unit 28 moves the yarn removing lever 55 to the yarn removing position P2, and just before the yarn removing lever 55 acts on (comes into contact with) the spun yarn 5, the unit control unit 28 decelerates the rotational speed Vb of the take up tube 7a to the sixth speed V6.

[0134] In step S180, the unit control section 28 stops the rotation of the winding tube 7a (in other words, sets the rotation speed Vb of the winding tube 7a to zero) and stops (stops) the rotation speed control during yarn breakage. The sixth speed V6 may be zero. In this case, the unit control section 28 processes steps S170 and S180 simultaneously.

[0135] (3-3-3) Activities of each department Next, the operation of each part in the rotation speed control at the time of yarn cutting will be described using a time chart. Figure 13 is a time chart showing the operation of each part in the rotation speed control at the time of yarn cutting.

[0136] When the rotational speed control during yarn breakage is started (t1), the rotational speed Vb of the winding tube 7a changes from the first speed V1 to the second speed V2 set based on information about the thickness of the spun yarn 5 (step S100), and the rotational speed Vr of the yarn storage roller 51 changes from the fourth speed V4 to the fifth speed V5 set based on information about the thickness of the spun yarn 5 (step S110).

[0137] Next, if the thickness T of the spun yarn 5 is equal to or greater than the threshold thickness Tth, when the storage amount S of the spun yarn 5 becomes less than the first storage amount S1 (t2), the rotation speed Vb of the winding tube 7a changes from the second speed V2 to a third speed V3 set based on the information about the thickness of the spun yarn 5 (step S130, "Yes" in step S140, step S150). If the thickness T of the spun yarn 5 is less than the threshold thickness Tth, the rotation speed Vb of the winding tube 7a remains at the second speed V2, as shown by the dotted line in FIG. 13 (step S130, "No" in step S140).

[0138] Next, when the stored amount S of the spun yarn 5 becomes less than the second stored amount S2 (t3), immediately before the yarn removal lever 55 acts on the spun yarn 5 (t4), the rotational speed Vb of the take-up tube 7a becomes the sixth speed V6 ("Yes" in step S150, step S160). In the example of FIG. 13, the sixth speed V6 is zero. The timing t4, which is the timing immediately before the yarn removal lever 55 acts on the spun yarn 5, can be set to a predetermined time after t3. The predetermined time may be zero (in other words, t3 = t4).

[0139] Thereafter, the take up tube 7a stops rotating (step S170, stop).

[0140] (4) Variations (4-1) In the above embodiment, the unit control unit 28 used the count information received by the operation unit 117 as information regarding the thickness of the spun yarn 5. However, the unit control unit 28 may also use the detection results of the yarn monitoring device 26 as information regarding the thickness of the spun yarn 5. More specifically, the unit control unit 28 may also use the thickness of the spun yarn 5 detected by the yarn monitoring device 26 as information regarding the thickness of the spun yarn 5.

[0141] (4-2) In the above embodiment, the amount S of spun yarn 5 stored in the yarn storage device 23 is reduced by the yarn removal lever 55, but the amount S of spun yarn 5 stored in the yarn storage device 23 may also be reduced by stopping the rotation of the yarn hooking member 53.

[0142] (4-3) In the above embodiment, the information regarding the thickness of the spun yarn 5 was whether the count of the spun yarn 5 was Ne15 or less, but the information regarding the thickness of the spun yarn 5 is not limited to this and may be based on a count other than Ne15.

[0143] (4-4) In the above embodiment, the second speed V2, the third speed V3, and the fifth speed V5 are fixed values ​​recorded in the table, but the second speed V2, the third speed V3, and the fifth speed V5 may be variable values. Specifically, the unit control section 28 can calculate at least one of the second speed V2, the third speed V3, and the fifth speed V5 based on a preset relational expression every time the rotation speed control at yarn cutting is performed.

[0144] (4-5) In the above embodiment, when the spun yarn 5 is less than the predetermined threshold thickness Tth, the unit control unit 28 proceeds to step S160, thereby maintaining the rotation speed Vb of the winding tube 7a at the second speed V2. However, this control may be achieved in other ways. Specifically, when the spun yarn 5 is less than the predetermined threshold thickness Tth, the unit control unit 28 may proceed from step S130 to step S140, thereby setting the third speed V3 to the same value as the second speed V2, thereby maintaining the rotation speed Vb of the winding tube 7a at the second speed V2. Note that even when the spun yarn 5 is less than the predetermined threshold thickness Tth, the second speed V2 may be set to a value different from the third speed V3.

[0145] (4-6) In the above embodiment, the stored amount S of the spun yarn 5 is obtained using the detection result of the stored yarn amount detection sensor 56, but the stored amount S of the spun yarn 5 may be obtained by other methods. Specifically, in the rotation speed control at yarn breakage, the unit control unit 28 may use a value calculated by subtracting the amount of spun yarn 5 wound around the winding tube 7a from the amount of spun yarn 5 stored in the yarn storage device 23 as the stored amount S of the spun yarn 5.

[0146] (4-7) In the above embodiment, the second speed V2, the third speed V3, and the fifth speed V5 are set to different speeds based on information regarding the thickness of the spun yarn 5, but any one of the second speed V2, the third speed V3, and the fifth speed V5 may be the same regardless of the information regarding the thickness of the spun yarn 5.

[0147] (4-8) Although the rotation speed Vb has three stages, namely, the first speed V1, the second speed V2, and the third speed V3, it is not limited to this and may have four or more stages. Similarly, the rotation speed Vr has two stages, namely, the fourth speed V4 and the fifth speed V5, it is not limited to this and may have three or more stages.

[0148] (4-9) In controlling the rotation speed during yarn breakage, the unit control unit 28 may set at least one of the fifth speed V5 and the sixth speed V6 based on information related to the thickness of the spun yarn 5 and the tension detected by the spinning sensor 27. Specifically, the unit control unit 28 sets at least one of the fifth speed V5 and the sixth speed V6 lower the higher the tension of the spun yarn 5. More specifically, for example, if the tension detected by the spinning sensor 27 is greater than a predetermined value, the unit control unit 28 sets the new fifth speed V5 to a speed lower than the fifth speed V5 determined based on the information related to the thickness of the spun yarn 5. Furthermore, for example, if the tension detected by the spinning sensor 27 is less than a predetermined value, the unit control unit 28 sets the new sixth speed V6 to a speed higher than a predetermined sixth speed V6 (e.g., sixth speed V6 = 0).

[0149] (5) Features of the embodiment The above embodiment can also be explained as follows.

[0150] A spinning machine (for example, spinning machine 1) includes a spinning device (for example, spinning device 22), a winding device (for example, winding device 25), a yarn storage device (for example, yarn storage device), a yarn splicing device (for example, yarn splicing device 82), a suction device (for example, suction device 24), and a control device (for example, unit control unit 28). The spinning device spins a fiber bundle (for example, fiber bundle 4b) to produce a yarn (for example, spun yarn 5) and supplies the yarn. The winding device winds the yarn supplied from the spinning device onto a rotating winding tube (for example, winding tube 7a) to form a package (for example, package 7). The yarn storage device is disposed midway along the yarn path formed between the spinning device and the winding device, and stores the yarn supplied by the spinning device. The control device controls the rotation of the winding device and the rotation of the yarn storage device. The yarn splicing device splices the yarn on the package side with the yarn on the spinning device side. The suction device is provided downstream of the yarn storage device and upstream of the yarn joining device, and sucks and captures the yarn on the package side. When the yarn is cut between the spinning device and the winding device, the control device executes a first process to change the rotation speed of the winding tube from a first speed (e.g., first speed V1) to a second speed (e.g., second speed V2) that is slower than the first speed and set based on information about the yarn thickness.

[0151] The thicker the yarn, the smaller the amount of yarn stored in the yarn storage device. Therefore, if a thick yarn is cut, driving the winding tube at the same rotation speed as for a thin yarn shortens the time it takes for all of the stored yarn to be unwound from the yarn storage device. As a result, there are cases where the suction device is not ready in time and the yarn cannot be captured. On the other hand, if the winding tube is always driven at a rotation speed that can reliably capture a thick yarn, the cycle time cannot be shortened.

[0152] In this spinning machine, the second speed, which is the rotation speed of the take-up tube after the yarn is cut, is set based on information about the yarn thickness, and the time until all of the stored yarn is unwound from the yarn storage device also changes based on the information about the yarn thickness. Therefore, by setting the second speed lower the thicker the yarn, the time from when the yarn is cut until all of the stored yarn is unwound from the yarn storage device can be made longer the thicker the yarn. This ensures sufficient time from when the yarn is cut until preparation for catching is made, even when the yarn is thick, and ensures a high success rate of catching the yarn end in the yarn splicing process.

[0153] Furthermore, the second speed is higher when the yarn is thin than when the yarn is thick. In this case, because the yarn is thin, a large amount of yarn is stored in the yarn storage device, and it takes a long time from when the yarn is cut until all of the stored yarn is unwound from the yarn storage device. As a result, the success rate of capturing the yarn end in the yarn splicing process can be ensured even when the yarn is thin. In addition, when the yarn is thin, the second speed is high, which prevents the cycle time from becoming long.

[0154] Therefore, according to the present spinning machine, it is possible to prevent the cycle time from becoming long while ensuring a high success rate of capturing the yarn end in the yarn joining process.

[0155] The spinning machine further includes a first detection unit (e.g., a stored yarn amount detection sensor 56) that detects the amount of yarn stored in the yarn storage device. The control device determines whether the yarn is equal to or greater than a predetermined threshold thickness based on information about the yarn thickness. If the yarn thickness is equal to or greater than the predetermined threshold thickness (threshold thickness Tth), the control device executes a second process to change the rotation speed of the take up tube from the second speed to a third speed (e.g., third speed V3) that is slower than the second speed and set based on the information about the yarn thickness when the first detection unit detects, after executing the second process, that the stored amount is less than a predetermined second stored amount (e.g., second stored amount S2), which is less than the first stored amount. The control device stops rotation of the take up tube when the first detection unit detects, after executing the second process, that the stored amount is less than a predetermined second stored amount (e.g., second stored amount S2), which is less than the first stored amount. Furthermore, if the yarn thickness is less than the threshold thickness, the control device stops the rotation of the take up tube when the first detection unit detects that the stored amount is less than the second stored amount after the first process is performed.

[0156] In this spinning machine, when the yarn is equal to or larger than a threshold thickness (i.e., thick), the rotation speed is gradually reduced in accordance with the decrease in the amount of yarn stored on the take-up tube. Therefore, this spinning machine can more effectively prevent the cycle time from becoming longer while ensuring the success rate of capturing the yarn end in the yarn joining process.

[0157] The yarn pooling device has a yarn pooling roller (e.g., yarn pooling roller 51) that can store the yarn by winding it around its outer periphery. When the yarn is cut between the spinning device and the winding device, the control device changes the rotation speed of the yarn pooling roller from a fourth speed (e.g., fourth speed V4) to a fifth speed (e.g., fifth speed V5) that is slower than the fourth speed and is set based on information about the thickness of the yarn.

[0158] In this spinning machine, the difference in rotation speed between the yarn pooling roller and the winding tube can be set within an appropriate range, thereby preventing twisting of the yarn between the yarn pooling device and the winding device.

[0159] The yarn storage device further includes a yarn acting member (e.g., a yarn removal lever 55) that acts on the yarn to reduce the amount of yarn stored in the yarn storage roller based on the rotation of the yarn storage roller. The control device reduces the rotational speed of the take up tube to a sixth speed (e.g., a sixth speed V6) that is slower than the fifth speed and is just before the yarn acting member acts on the yarn.

[0160] In this spinning machine, the difference in rotational speed between the yarn pooling roller and the winding tube when the yarn acting member acts on the yarn can be kept within an appropriate range. This prevents the yarn tension from increasing between the yarn pooling device and the winding device. Therefore, this spinning machine prevents the yarn from being broken between the yarn pooling device and the winding device. Furthermore, this spinning machine allows the suction device to easily capture the yarn.

[0161] The spinning machine further includes a second detection unit (for example, spinning sensor 27) that detects the tension of the yarn. The control device sets at least one of the fifth speed and the sixth speed based on information related to the thickness of the yarn and the tension detected by the second detection unit.

[0162] In this spinning machine, at least one of the fifth speed and the sixth speed is set based on the tension. Generally, a yarn with high tension has high rigidity and is difficult to bend. If the yarn tension is high, the suction device may fail to capture the yarn. Therefore, by setting at least one of the fifth speed and the sixth speed based on the information about the yarn thickness and the tension, the suction device can more easily capture the yarn.

[0163] The spinning machine includes an operation unit (for example, operation unit 117) that receives yarn count information. The control device uses the count information received by the operation unit as information related to the thickness of the yarn.

[0164] The system is provided with a yarn monitoring device (for example, yarn monitoring device 26) that detects the thickness of the yarn. The control device uses the detection result of the yarn monitoring device as information regarding the thickness of the yarn.

[0165] In this spinning machine, an operator does not need to provide yarn count information to the operation unit, so that the spinning machine can more effectively prevent the cycle time from becoming longer.

[0166] The information regarding the thickness of the thread is whether the thread count is Ne15 or less.

[0167] 2. Second embodiment (1) Overall structure The unit control unit 28 may execute the above-mentioned second process (step S150) regardless of the thickness T of the spun yarn 5, and after executing the second process, if the second sensor 56b of the yarn storage amount detection sensor 56 detects that the storage amount is less than the second storage amount S2 (step S160), it may stop the rotation of the winding tube 7a.

[0168] Fig. 14 is a flowchart of the rotation speed control at yarn breakage executed by the unit control unit 28 of the spinning machine 1 according to the second embodiment. In Fig. 14, the same reference numerals are used for the processes that are the same as or correspond to those in the flowchart shown in Fig. 11. As shown in Fig. 14, the control flow of the rotation speed control at yarn breakage executed by the unit control unit 28 of the spinning machine 1 according to the second embodiment differs from the flowchart shown in Fig. 11 in that it does not include step S130.

[0169] (2) Features of the embodiment The above embodiment can also be explained as follows.

[0170] The spinning machine further includes a first detection unit that detects the amount of yarn stored in the yarn storage device. After the first process is performed, if the first detection unit detects that the stored amount is less than a predetermined first stored amount, the control device changes the rotation speed of the take up tube from the second speed to a third speed that is slower than the second speed and is set based on information about the yarn thickness.

[0171] In this spinning machine, the rotation speed is gradually reduced in accordance with the decrease in the amount of yarn stored on the take-up tube, so that the spinning machine can more effectively prevent the cycle time from becoming longer while ensuring a high success rate in capturing the yarn end during the yarn splicing process.

[0172] 3. Third embodiment (1) Overall structure In the first process, the unit control section 28 may set the second speed based on the tension of the spun yarn 5 detected by the spinning sensor 27.

[0173] (2) Features of the embodiment The above embodiment can also be explained as follows.

[0174] A spinning machine (for example, spinning machine 1) includes a spinning device (for example, spinning device 22), a winding device (for example, winding device 25), a yarn storage device (for example, yarn storage device), a yarn joining device (for example, yarn joining device 82), a suction device (for example, suction device 24), and a control device (for example, unit control unit 28). The spinning device spins a fiber bundle (for example, fiber bundle 4b) to produce a yarn (for example, spun yarn 5) and supplies the yarn. The winding device winds the yarn supplied from the spinning device onto a rotating winding tube (for example, winding tube 7a) to form a package (for example, package 7). The yarn storage device is disposed on a yarn path formed between the spinning device and the winding device, and stores the yarn supplied by the spinning device. The control device controls the rotation of the winding device and the rotation of the yarn storage device. The yarn joining device joins the yarn on the package side with the yarn on the spinning device side. The suction device is provided downstream of the yarn storage device and upstream of the yarn joining device, and sucks and captures the yarn on the package side. When the yarn is cut between the spinning device and the winding device, the control device executes a first process to change the rotation speed of the winding tube from a first speed (e.g., first speed V1) to a second speed (e.g., second speed V2) that is slower than the first speed and set based on the tension of the yarn.

[0175] Thicker yarns have higher rigidity than thinner yarns. Therefore, in a spinning device, the thicker the yarn, the higher the tension tends to be. In the first embodiment, the second speed was set based on information about the yarn thickness. However, for the reasons described above, the second speed, which is the rotation speed of the winding tube after the yarn is cut, can be set using the yarn tension. Therefore, like the spinning machine according to the first embodiment, the spinning device according to the third embodiment can prevent the cycle time from becoming longer while ensuring the success rate of capturing the yarn end during the yarn joining process. The third and fifth speeds in the first embodiment may also be set using the yarn tension.

[0176] 4. Conclusion Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention. In particular, the multiple embodiments and modifications described in this specification can be arbitrarily combined as necessary. [Explanation of symbols]

[0177] 1: Spinning machine 2: Spinning unit 4a: Sliver 4b: Fiber bundle 5: Spun yarn 7: Package 7a: Winding tube 20: Sliver supply section 21: Draft device 22: Spinning device 23: Yarn storage device 24:Suction device 25: Winding device 26: Yarn monitoring device 27: Spinning sensor 28: Unit control section 41: Back roller pair 42: Third Roller vs. 43: Middle Roller vs. 44: Front roller pair 45: Apron belt 51: Yarn storage roller 52: Electric motor 53: Yarn hooking member 54: Guide 55: Thread release lever 56: Yarn storage amount detection sensor 56a: First sensor 56b: Second sensor 61: Suction pipe 62: Suction port 63: Shutter 64: Yarn catch detection sensor 71: Cradle device 72: Package rotation device 73: Traverse device 74: Cradle arm 75: Support shaft 76: Winding drum 77: Drum drive motor 78: Thread guide 79: Traverse drive motor 80: Yarn splicing cart 81: Running wheel 82: Yarn splicing device 83: Suction pipe 84: Suction mouth 85: Carriage control unit 88: Tip 89: Tip 101: Rail 111: Blower box 112: Control box 113: Blower 115: Central control unit 116:Display section 117:Operation unit P1: Standby position P2: Thread removal position S1: First storage volume S2: Second storage volume V1: 1st speed V2: 2nd speed V3: 3rd speed V4: 4th speed V5: 5th speed V6: 6th speed Vb: Rotation speed Vr: rotation speed

Claims

1. a spinning device that spins a fiber bundle to produce a yarn and supplies the yarn; a winding device that winds the yarn supplied from the spinning device onto a rotating winding tube to form a package; a yarn pooling device that is disposed on a yarn path formed between the spinning device and the winding device and pools the yarn supplied by the spinning device; a yarn splicing device that splices the yarn on the package side and the yarn on the spinning device side; a suction device that is provided downstream of the yarn pooling device and upstream of the yarn joining device and that sucks and captures a package-side yarn; a control device that controls the rotation of the winding device and the rotation of the yarn pooling device; Equipped with The control device When the yarn is broken between the spinning device and the winding device, a first process is executed to change the rotation speed of the winding tube from a first speed to a second speed that is slower than the first speed and is set based on information about the thickness of the yarn. Spinning machine.

2. The yarn storage device further includes a first detection unit that detects the amount of the yarn stored in the yarn storage device, The control device determining whether the yarn has a thickness equal to or greater than a predetermined threshold based on the information about the yarn thickness; If the thickness of the thread is equal to or greater than a predetermined threshold thickness, when the first detection unit detects that the stored amount is less than a predetermined first stored amount after the first process is executed, a second process is executed to change the rotation speed of the take up tube from the second speed to a third speed that is slower than the second speed and is set based on information about the yarn thickness; After the second process is performed, when the first detection unit detects that the storage amount is less than a predetermined second storage amount that is less than the first storage amount, the rotation of the winding tube is stopped; If the thickness of the thread is less than the threshold thickness, After the first process is performed, when the first detection unit detects that the stored amount is less than the second stored amount, the rotation of the winding tube is stopped. The spinning machine according to claim 1.

3. The yarn storage device further includes a first detection unit that detects the amount of the yarn stored in the yarn storage device, The control device When the first detection unit detects that the stored amount is less than a predetermined first stored amount after the first process is performed, the rotation speed of the take up tube is changed from the second speed to a third speed that is slower than the second speed and is set based on information about the thickness of the yarn. The spinning machine according to claim 1.

4. The yarn storage device is a yarn storage roller capable of storing the yarn by winding it around its outer periphery; The control device When the yarn is broken between the spinning device and the winding device, the rotation speed of the yarn pooling roller is changed from a fourth speed to a fifth speed that is slower than the fourth speed and is set based on information about the thickness of the yarn. The spinning machine according to any one of claims 1 to 3.

5. The yarn storage device is The yarn storage device further includes a yarn acting member that acts on the yarn so as to reduce the amount of the yarn stored in the yarn storage roller based on the rotation of the yarn storage roller, The control device the rotation speed of the take-up tube is reduced to a sixth speed, which is lower than the fifth speed, just before the yarn acting member acts on the yarn; The spinning machine according to claim 4.

6. Further provided is a second detection unit that detects the tension of the thread, The control device at least one of a fifth speed and a sixth speed is set based on the information about the thickness of the yarn and the tension detected by the second detection unit; The spinning machine according to claim 5.

7. an operation unit that receives the yarn count information, The control device The count information received by the operation unit is used as information regarding the thickness of the yarn. The spinning machine according to any one of claims 1 to 6.

8. a yarn monitoring device that detects the thickness of the yarn; The control device The detection result of the yarn monitoring device is used as information regarding the thickness of the yarn. The spinning machine according to any one of claims 1 to 6.

9. The information about the thickness of the thread is The thread count is Ne15 or less. The spinning machine according to any one of claims 1 to 8.

10. a spinning device that spins a fiber bundle to produce a yarn and supplies the yarn; a winding device that winds the yarn supplied from the spinning device onto a rotating winding tube to form a package; a yarn pooling device that is disposed on a yarn path formed between the spinning device and the winding device and pools the yarn supplied by the spinning device; a yarn splicing device that splices the yarn on the package side and the yarn on the spinning device side; a suction device that is provided downstream of the yarn pooling device and upstream of the yarn joining device and that sucks and captures a package-side yarn; a control device that controls the rotation of the winding device and the rotation of the yarn pooling device; Equipped with The control device When the yarn is broken between the spinning device and the winding device, a first process is executed to change the rotation speed of the winding tube from a first speed to a second speed that is slower than the first speed and is set based on the tension of the yarn. Spinning machine.

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