Spinning machine

Abstract

The invention provides a spinning machine capable of ensuring the capturing success rate of a yarn end in yarn splicing processing and inhibiting the cycle time from being prolonged at the same time. A 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 generates a yarn by spinning a fiber bundle and supplies the yarn. The winding device forms a package by winding a yarn supplied from a spinning device onto a winding tube. 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. When the yarn is cut between the spinning device and the winding device, the control device executes a first process of changing the rotation speed of the winding tube from a first speed to a second speed which is slower than the first speed and set based on information related to the thickness of the yarn.

Description

Technical Field

[0001] This invention relates to spinning machines. Background Technology

[0002] A spinning machine is known in which, after the supplied yarn is temporarily stored in a yarn storage device, it is wound onto a winding tube (yarn tube) in a winding device to form a package. This spinning machine is disclosed in Japanese Patent Application Publication No. 2022-189204.

[0003] In the spinning machine disclosed in Japanese Patent Application Publication No. 2022-189204, the yarn retention device includes a yarn retention roller. The yarn retention device is capable of temporarily retaining yarn wound on the outer periphery of the yarn retention roller. The spinning machine performs a splicing process when the yarn is cut. In the splicing process, a suction device located downstream of the yarn retention roller captures the yarn end unwound from the yarn retention roller.

[0004] The thicker the yarn, the less yarn is retained in the yarn holding device. Therefore, when a thick yarn is cut, if the winding tube is driven at the same rotational speed as for a thin yarn, the time until all the retained yarn is unwound from the yarn holding device is shorter. As a result, sometimes the suction device cannot catch the yarn in time to prepare to catch the yarn end. On the other hand, if the winding tube is always driven at a rotational speed that reliably catches the yarn when it is thick, the cycle time (operational cycle time) becomes longer when it is thin. Thus, there is room for improvement in controlling the rotational speed of the winding tube during yarn splicing. Summary of the Invention

[0005] The purpose of this invention is to provide a spinning machine that can ensure the success rate of yarn end capture during the yarn splicing process while suppressing the increase of cycle time.

[0006] The following describes several methods as means to solve the problem. These methods can be combined arbitrarily as needed.

[0007] A spinning machine includes a spinning unit, a winding unit, a yarn holding unit, a yarn splicing unit, a suction unit, and a control unit. The spinning unit generates yarn by spinning a fiber bundle and supplies the yarn. The winding unit winds the yarn supplied from the spinning unit onto a rotating winding tube to form a package. The yarn holding unit is positioned on the yarn path formed between the spinning unit and the winding unit, holding the yarn supplied by the spinning unit. The splicing unit splices the yarn from the package side to the yarn from the spinning unit side. The suction unit is located downstream of the yarn holding unit and upstream of the splicing unit, attracting and capturing the yarn from the package side. The control unit controls the rotation of the winding unit and the yarn holding unit. When the yarn is cut between the spinning unit and the winding unit, the control unit performs a first process, changing the rotation speed of the winding tube from a first speed to a second speed set based on information related to the yarn thickness, which is slower than the first speed.

[0008] Even with coarse yarn, this spinning machine can adequately ensure the time from yarn cutting to preparation for yarn capture, thus guaranteeing a high success rate in capturing the yarn end during the splicing process. Furthermore, by using a different rotation speed for fine yarn compared to coarse yarn, the cycle time can be suppressed from becoming longer. Therefore, according to this spinning machine, a high success rate in capturing the yarn end during the splicing process can be ensured while suppressing a longer cycle time.

[0009] The spinning machine also has a first detection unit for detecting the amount of yarn stored on the yarn storage device. After the control device performs the first process, when the first detection unit detects that the amount of yarn stored is less than the specified first amount of yarn stored, it changes the rotation speed of the winding tube from the second speed to a third speed that is slower than the second speed and is set based on information related to the thickness of the yarn.

[0010] In this spinning machine, the rotational speed is reduced in stages due to the decrease in the amount of yarn retained on the yarn retention device. Therefore, according to this spinning machine, it is possible to more effectively ensure the success rate of yarn end capture during the splicing process while suppressing the increase in cycle time.

[0011] The spinning machine also includes a first detection unit for detecting the amount of yarn stored on the yarn storage device. The control device determines whether the yarn thickness is above or below a predetermined threshold based on information related to the yarn's thickness. If the yarn thickness is above or below the predetermined threshold, after performing the first processing, if the first detection unit detects that the stored amount is less than the predetermined first stored amount, the control device performs a second processing: changing the rotation speed of the winding tube from a second speed to a third speed, which is slower than the second speed and set based on information related to the yarn thickness. After performing the second processing, if the first detection unit detects that the stored amount is less than the predetermined second stored amount, the control device stops the rotation of the winding tube, where the second stored amount is less than the first stored amount. Furthermore, if the yarn thickness is less than the threshold thickness, after performing the first processing, if the first detection unit detects that the stored amount is less than the second stored amount, the control device stops the rotation of the winding tube.

[0012] In this spinning machine, when the yarn thickness is above a threshold (i.e., the yarn is thick), the rotational speed decreases in stages due to a reduction in the amount of yarn retained on the yarn retention device. Therefore, according to this spinning machine, it is possible to more effectively ensure the success rate of yarn end capture during the splicing process while suppressing the increase in cycle time.

[0013] The yarn retention device has a yarn retention roller capable of retaining 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 retention roller from a fourth speed to a fifth speed, which is slower than the fourth speed and is set based on information related to the thickness of the yarn.

[0014] In this spinning machine, the difference in rotational speed between the yarn holding roller and the winding tube can be kept within an appropriate range. This prevents the yarn from twisting between the yarn holding device and the winding device.

[0015] The yarn retention device also includes a yarn actuating component that acts on the yarn to reduce the amount of yarn retained on the yarn retention roller based on the rotation of the yarn retention roller. A control device decelerates the rotational speed of the winding tube when the yarn actuating component acts on the yarn, the rotational speed of the winding tube just before the yarn actuating component acts on the yarn, or the rotational speed of the winding tube immediately after the yarn actuating component acts on the yarn, towards a sixth speed, which is slower than the fifth speed.

[0016] In this spinning machine, the difference in rotational speed between the yarn holding roller and the winding tube when the yarn action component acts on the yarn is within an appropriate range. This prevents the yarn tension from increasing between the yarn holding device and the winding device. Therefore, according to this spinning machine, yarn cutting between the yarn holding device and the winding device can be prevented. Furthermore, according to this spinning machine, the suction device can easily capture the yarn.

[0017] The spinning machine also has a second detection unit for detecting yarn tension. The control device sets at least one of a fifth speed and a sixth speed based on information related to the yarn thickness and the tension detected by the second detection unit.

[0018] In this spinning machine, at least one of the fifth and sixth speeds is set based on tension. Generally, yarns with high tension are highly rigid and difficult to bend. When the yarn tension is high, the suction device may fail to capture the yarn. Therefore, by setting at least one of the fifth and sixth speeds based on information related to the yarn thickness and tension, the suction device can capture the yarn more easily.

[0019] The spinning machine has an operating unit that receives yarn count information. The control device uses the yarn count information received by the operating unit as information related to the yarn's thickness.

[0020] It is equipped with a yarn monitoring device to detect the thickness of the yarn. The control device uses the detection results of the yarn monitoring device as information related to the thickness of the yarn.

[0021] In this spinning machine, the operator does not need to provide yarn count information to the operating unit. Therefore, this spinning machine can more effectively suppress the increase in cycle time.

[0022] Information related to yarn thickness refers to whether the yarn count is below Ne15.

[0023] Invention Effects

[0024] The spinning machine according to the present invention can shorten the cycle time without reducing the success rate of yarn end capture during the splicing process. Attached Figure Description

[0025] Figure 1 This is a front view showing the overall structure of a spinning machine according to one embodiment of the present invention.

[0026] Figure 2 This is a side view of the spinning unit in a spinning machine.

[0027] Figure 3 This is a side view showing the state of yarn cutting in the spinning unit.

[0028] Figure 4 This is a side view showing the situation during the fixed capture and splicing process where the yarn release lever moves from the standby position to the yarn release position, the yarn remaining on the yarn retention roller is unwound, and the slack yarn is attracted by the suction device.

[0029] Figure 5 This is a side view showing the state in which the yarn end of the spun yarn on the package side falls off the yarn retention roller and is captured by the suction device, and the spun yarn on the package side becomes a state in which it can be received by the yarn receiving device of the yarn receiving trolley.

[0030] Figure 6 This indicates that the spinning device starts from... Figure 5 A side view of the state in which the spinning process begins and the spun yarn from the spinning device is guided by the suction tube to the yarn receiving device.

[0031] Figure 7 This is a side view showing the situation where the yarn is unwound during the spinning process after the transition from yarn exit spinning to normal spinning, with the yarn release rod in the yarn release position and the yarn remaining on the yarn retention roller.

[0032] Figure 8 This is a side view showing the yarn release lever in the standby position and yarn splicing in the yarn splicing device.

[0033] Figure 9 This is a side view showing the situation in which the yarn on the package side is captured by the suction nozzle and the yarn on the spinning device side is captured by the suction tube during the moving capture and splicing process, and both are guided to the splicing device for splicing.

[0034] Figure 10 This is a schematic diagram showing the positions of the first sensor 56a and the second sensor 56b.

[0035] Figure 11 This is a flowchart of the rotation speed control during yarn cutting.

[0036] Figure 12 It is a graph that records the speeds corresponding to the count of the spinning yarn 5.

[0037] Figure 13 It is a time graph showing the rotational speed of each part in the rotational speed control during yarn cutting.

[0038] Figure 14 This is a flowchart of the rotation speed control during yarn cutting performed by the unit control unit 28 of the spinning machine 1 in the second embodiment. Detailed Implementation

[0039] 1. First Implementation Method

[0040] (1) Overall structure

[0041] A spinning machine 1 according to one embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, "upstream" and "downstream" refer to the upstream and downstream directions of the spinning yarn 5, the yarn sliver 4a, or the fiber bundle 4b in the direction of travel (yarn travel direction) when the spinning yarn 5 (yarn) is wound. "Front" and "rear" refer to the near front and inner sides when the front of the spinning machine 1 is facing the spinning machine 1. Figure 1 (near the anterior and medial sides).

[0042] like Figure 1 As shown, the spinning machine 1 includes a blower housing 111, a control box 112, multiple spinning units 2, and a yarn receiving trolley 80. The multiple spinning units 2 are arranged in a predetermined direction. Each spinning unit 2 uses a spinning device 22, etc., described later, to spin yarn. In this embodiment, the spinning machine 1 is configured as an air spinning machine.

[0043] A blower 113, which functions as a negative pressure source, is installed inside the blower housing 111. The blower 113 is controlled by a central control device 115, which will be described later.

[0044] The control box 112 is equipped with a central control device 115, a display unit 116 and an operation unit 117.

[0045] The central control unit 115 centrally manages and controls all parts of the spinning machine 1. The central control unit 115 connects to each spinning unit 2 via signal lines (not shown in the diagram). Figure 2 The unit control unit 28 (control device) is connected in this way. In this embodiment, each spinning unit 2 has a unit control unit 28, but a predetermined number (e.g., two or four) of spinning units 2 may share one unit control unit 28. The central control device 115 is composed of a well-known computer (not shown) having a CPU, ROM, RAM, etc.

[0046] The display unit 116 can display settings for the spinning units 2 and / or information related to the status of each spinning unit 2. The operation unit 117 is operated by the operator to set the spinning machine 1 and / or select information displayed on the display unit 116. The operation unit 117 appropriately sends the received information to the unit control unit 28. The display unit 116 and the operation unit 117 may also be configured as a touch panel display.

[0047] like Figure 1 As shown, a guide rail 101 is provided on the spinning machine 1. The guide rail 101 is arranged to extend along the arrangement direction of the plurality of spinning units 2. The yarn receiving carriage 80 is configured to travel on the guide rail 101. Therefore, the yarn receiving carriage 80 can move relative to the plurality of spinning units 2. Figure 1The diagram shows one yarn receiving trolley 80, but the spinning machine 1 can also have multiple yarn receiving trolleys 80.

[0048] (2) Detailed Structure

[0049] (2-1) Spinning Unit 2

[0050] like Figure 2 As shown, each spinning unit 2 includes a drafting device 21, a spinning device 22, a yarn storage 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 sequentially from upstream to downstream in the direction of travel of the spun yarn 5, etc.

[0051] (2-1-1) Drafting device 21

[0052] The drafting device 21 is located on the upper part of the spinning machine 1 and the spinning unit 2. The drafting device 21 has multiple pairs of drafting rollers. Each pair of drafting rollers consists of two drafting rollers.

[0053] Specifically, the drafting device 21 has four pairs of drafting rollers. The four pairs of drafting rollers are arranged sequentially from upstream to downstream: a rear roller pair 41, a third roller pair 42, an intermediate roller pair 43, and a front roller pair 44. Each drafting roller in the intermediate roller pair 43 is provided with a conveyor belt 45.

[0054] Each of the four drafting roller pairs has a drive roller and a driven roller that are opposite each other. For each of the four drafting roller pairs, a drive source, such as a motor (not shown), is provided on each drive roller. Each drive roller is driven to rotate about its own axis by the drive source. The driven roller of each drafting roller pair is configured to rotate about its own axis via a bearing (not shown). The drive source for the drafting roller pairs is controlled by the unit control unit 28.

[0055] The drafting device 21 stretches (drafts) the yarn 4a supplied from the yarn supply unit 20 into a predetermined fiber quantity (or thickness) by conveying the yarn 4a between each pair of drafting rollers (between the driving roller and the driven roller) to generate a fiber bundle 4b. The fiber bundle 4b generated by the drafting device 21 is then supplied to the spinning device 22.

[0056] The yarn supply section 20 is located upstream of the drafting device 21. The yarn supply section 20 is equipped with a sliver can that serves as a container for holding the yarn 4a.

[0057] (2-1-2) Spinning device 22

[0058] The spinning device 22 generates spun yarn 5 by spinning the fiber bundle 4b 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 spins yarn 5 by twisting the fiber bundle 4b (the drafted yarn 4a) generated by the drafting device 21 by acting a swirling airflow. The spinning device 22 is located downstream of the drafting device 21. The spun yarn 5 generated by the spinning device 22 is supplied to the yarn storage device 23.

[0059] (2-1-3) Yarn retention device 23

[0060] The yarn holding device 23 is arranged on the yarn path formed between the spinning device 22 and the winding device 25 to temporarily hold the spun yarn 5 supplied by the spinning device 22.

[0061] The yarn retention device 23 includes a yarn retention roller 51, an electric motor 52, a yarn hanging component 53, a guide 54, a yarn release rod 55 (yarn action component), and a yarn retention amount detection sensor 56 (first detection unit).

[0062] The yarn retention roller 51 is driven to rotate by an electric motor 52. The yarn retention roller 51 temporarily retains the spun yarn 5 by winding it around its outer periphery. By rotating at a predetermined speed with the spun yarn 5 wound around its outer periphery, the yarn retention roller 51 can draw 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.

[0063] The yarn-hanging component 53 is capable of hooking the spinning yarn 5. The yarn-hanging component 53 guides the spinning yarn 5 to the outer peripheral surface of the yarn-retaining roller 51 by rotating together with the yarn-holding roller 51 while the spinning yarn 5 is hooked.

[0064] Hereinafter, the rotation of the yarn holding roller 51 in the direction from which the spinning yarn 5 is drawn from the spinning device 22 is sometimes referred to as forward rotation, and the rotation in the opposite direction is sometimes referred to as reverse rotation. Similarly, regarding the yarn hanging component 53, the rotation in the same direction as the yarn holding roller 51 is sometimes referred to as forward rotation, and the rotation in the opposite direction is sometimes referred to as reverse rotation. Normally, the yarn holding roller 51 and the yarn hanging component 53 are driven in the forward rotation direction.

[0065] The yarn release lever 55 acts on the spinning yarn 5 to reduce the amount of yarn retained on the yarn retention roller 51 due to the rotation of the yarn retention roller 51. The yarn release lever 55 is positioned near the yarn retention roller 51. The yarn release lever 55 is capable of performing a yarn release action that disengages the spinning yarn 5 from the yarn hanging member 53. The yarn release lever 55 is as follows... Figure 1 The component shown is configured in an L-shape, with its ends supported in a rotatable manner.

[0066] The yarn release lever 55 is configured to move between the standby position P1 and the yarn release position P2. Figure 2 The diagram shows the yarn release lever 55 in the standby position P1. As the yarn release lever 55 moves from the standby position P1 to the yarn release position P2, it passes through the space downstream of the yarn holding roller 51. At this time, if there is a spun yarn 5 hooked on the yarn hanging member 53, the yarn release lever 55 will act on the spun yarn 5 to detach it from the yarn hanging member 53. Figure 4 and Figure 7 The diagram shows the state of the yarn release lever 55 in the yarn release position P2.

[0067] In this embodiment, yarn release levers 55 are provided in each spinning unit 2, and each yarn release lever 55 has a separate drive unit (motor or cylinder, etc.). Therefore, the yarn release lever 55 can operate independently relative to the yarn release levers 55 of other spinning units 2. The drive unit of the yarn release lever 55 is controlled by the unit control unit 28.

[0068] The guide 54 is positioned downstream of the yarn holding roller 51. The guide 54 restricts the track of the spinning yarn 5, which oscillates due to the rotating yarn hanging member 53, thereby stabilizing the yarn path downstream of the guide 54 (on the winding device 25 side) in the yarn path of the spinning yarn 5 and guiding the spinning yarn 5. The guide 54 is positioned downstream of the yarn release bar 55.

[0069] The yarn accumulation detection sensor 56 can detect the accumulation amount S of the spun yarn 5 on the yarn accumulation device 23 (more specifically, the yarn accumulation roller 51). The yarn accumulation detection sensor 56 has a first sensor 56a and a second sensor 56b. The first sensor 56a detects whether the accumulation amount S on the yarn accumulation roller 51 is greater than or equal to a predetermined first accumulation amount S1. The second sensor 56b detects whether the accumulation amount S on the yarn accumulation roller 51 is greater than or equal to a predetermined second accumulation amount S2, which is less than the first accumulation amount S1. The yarn accumulation detection sensor 56 sends the detection result to the unit control unit 28.

[0070] The first sensor 56a is positioned relative to the position of the spun yarn 5 on the outer peripheral surface of the yarn holding roller 51 when the holding amount S is the first holding amount S1. The second sensor 56b is positioned relative to the position of the spun yarn 5 on the outer peripheral surface of the yarn holding roller 51 when the holding amount S is the second holding amount S2. The first sensor 56a and the second sensor 56b detect when the spun yarn 5 has reached the outer peripheral surface of the corresponding yarn holding roller 51. Figure 10 This is a schematic diagram showing the positions of the first sensor 56a and the second sensor 56b.

[0071] The first sensor 56a and the second sensor 56b send the detection results to the unit control unit 28. The unit control unit 28 can detect whether the storage amount S is above a predetermined amount based on the detection results.

[0072] The yarn holding device 23 functions as a buffer for the yarn 5 because it can temporarily hold the spinning yarn 5 on the outer periphery of the yarn holding roller 51. This eliminates undesirable conditions (such as slack in the spinning yarn 5) caused by a mismatch between the spinning speed and the winding speed (the travel speed of the spinning yarn 5 wound by the package 7 described later) in the spinning device 22 for some reason.

[0073] (2-1-4) Suction device 24

[0074] When the spun yarn 5 is cut between the spinning device 22 and the winding device 25, the suction device 24 can attract the spun yarn 5 on the winding device 25 side. The suction device 24 is provided between the yarn storage device 23 and the winding device 25. In this embodiment, the suction device 24 is fixedly provided, but it can also be provided to be slightly movable. For example, the suction device 24 can also be provided to be able to move slightly in the direction of approaching and retracting relative to the yarn path.

[0075] The suction device 24 includes a suction tube 61. A suction port 62 is formed at the top end (one end in the longitudinal direction) of the suction tube 61. The suction port 62 opens toward the middle of the aforementioned yarn path. The suction tube 61 is connected to a negative pressure source such as a blower 113 via piping. As a result, a suction airflow is generated in the suction port 62 (within the suction tube 61). Unlike the suction nozzle 84 described later, the suction tube 61 is fixedly provided in the spinning unit 2. Therefore, the position of the suction port 62 is constant.

[0076] In this embodiment, the suction device 24 includes a gate 63. The gate 63 changes the state of the suction device 24 between a suction state and a suction stop state. The gate 63 is, for example, disposed between the suction port 62 and the downstream portion of the suction tube 61 in the airflow direction of the suction device 24. The gate 63 can be, for example, constructed by an opening and closing mechanism having a plate-like component. The gate 63 is controlled by the unit control unit 28. By opening the gate 63 only when needed, energy saving of the spinning machine 1 can be achieved. It should be noted that the suction device 24 may also be without the gate 63.

[0077] The suction device 24 includes 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 downstream of the suction device 24, immediately adjacent to the suction port 62. The yarn capture detection sensor 64 detects the presence of non-woven yarn 5 downstream of the suction device 24 and sends the detection result to the unit control unit 28. The yarn capture detection sensor 64 may also be disposed inside the suction tube 61.

[0078] (2-1-5) Winding device 25

[0079] The winding device 25 winds the spun yarn 5 supplied from the spinning device 22 onto the rotating winding tube 7a to form a package 7. The winding device 25 is located downstream of the yarn storage device 23.

[0080] The winding device 25 includes a cradle device 71, a winding rotation device 72, and a traversing device 73.

[0081] The cradle assembly 71 has a pair of cradle arms 74. The cradle assembly 71 is capable of rotatably supporting the winding tube 7a (and thus the package 7) for winding the spun yarn 5 between the pair of cradle arms 74. The cradle arms 74 are rotatable about a pivot 75.

[0082] The winding rotation device 72 includes a winding drum 76 and a drum drive motor 77. The winding drum 76 can contact 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 a suitable means (e.g., a belt). By driving the winding drum 76 by the drum drive motor 77, the winding tube 7a and the package 7 can be rotated in the direction of winding the spun yarn 5. The drum drive motor 77 is configured to rotate in both directions. Therefore, the drum drive motor 77 can also rotate the winding tube 7a and the package 7 in the opposite direction to the direction of winding the spun yarn 5. The drum drive motor 77 is controlled by the unit control unit 28.

[0083] The traverse device 73 includes a yarn guide 78 and a traverse drive motor 79. The yarn guide 78 is capable of hooking the spun yarn 5 wound onto the package 7. The yarn guide 78 is capable of reciprocating in the width direction of the package 7. The output shaft of the traverse drive motor 79 is connected to the yarn guide 78 by a suitable means (e.g., a belt and pulleys). By driving the yarn guide 78 to reciprocate while holding the spun yarn 5 on the yarn guide 78, the spun yarn 5 wound onto the package 7 can be traversely moved. The traverse drive motor 79 is controlled by the unit control unit 28.

[0084] The winding device 25 moves the yarn guide 78 of the traverse device 73 back and forth while rotating the winding drum 76 of the winding rotation device 72. Thus, the winding device 25 can wind the spun yarn 5 onto the winding tube 7a while moving the yarn 5 traversely.

[0085] (2-1-6) Yarn monitoring device 26

[0086] The yarn monitoring device 26 detects the state of the spun yarn 5 and its thickness T (diameter of the spun yarn 5) before it is stored by the yarn storing device 23. The yarn monitoring device 26 is located between the spinning device 22 and the spinning sensor 27. Thus, the spun yarn 5 generated by the spinning device 22 passes through the yarn monitoring device 26 before passing through the spinning sensor 27.

[0087] The yarn monitoring device 26 uses a light sensor to monitor the moving yarn 5 and detects yarn defects, yarn breakage, and yarn thickness T within the yarn 5. Yarn defects include, for example, abnormalities in the yarn thickness T and / or foreign matter contained within the yarn 5. When the yarn monitoring device 26 detects yarn defects or yarn breakage for some reason, it sends the yarn defect detection result to the unit control unit 28. Additionally, the yarn monitoring device 26 sends the detected yarn thickness T to the unit control unit 28.

[0088] The yarn monitoring device 26 can also replace the optical sensor with a sensor such as an electrostatic capacitive sensor to monitor the quality of the spun yarn 5. The yarn monitoring device 26 can also be configured to detect abnormalities in the tension of the spun yarn 5, either in place of these yarn defects or based on these yarn defects.

[0089] (2-1-7) Spinning Sensor 27

[0090] The spinning sensor 27 detects the tension of the spun yarn 5. The spinning sensor 27 is located between the yarn monitoring device 26 and the yarn holding device 23. The spun yarn 5, after passing through the yarn monitoring device 26, passes through the spinning sensor 27 before being held by the yarn holding device 23. The spinning sensor 27 transmits the detected tension of the spun yarn 5 to the unit control unit 28.

[0091] (2-1-8) Unit Control Section 28

[0092] The unit control unit 28 centrally manages and controls all parts of the spinning unit 2, cooperating with the central control device 115 and the trolley control unit 85 (described later) to realize the operation of the spinning unit 2. The unit control unit 28 is connected to all parts of the spinning unit 2 via signal lines (not shown). The unit control unit 28 is composed of a well-known computer (not shown) equipped with a CPU, ROM, RAM, etc. The unit control unit 28 controls the rotation of the winding device 25 and the yarn holding device 23, and performs the "rotation speed control during yarn cutting" (described later).

[0093] (2-2) Yarn receiving trolley 80

[0094] When the yarn 5 is cut in any spinning unit 2, the yarn splicing carriage 80, under the instruction of the unit control unit 28, moves to the working position corresponding to the spinning unit 2 where the yarn 5 was cut, and performs yarn splicing in that spinning unit 2. The yarn splicing carriage 80 is in a ready position on the guide rail 101 before the yarn 5 is cut. The yarn splicing carriage 80 performs the splicing in cooperation with the suction device 24 or the like provided in the spinning unit 2, or performs the splicing using a device provided with the yarn splicing carriage 80 (such as the suction nozzle 84 described later), as detailed later.

[0095] The yarn receiving trolley 80 has traveling wheels 81, yarn receiving device 82, suction pipe 83, suction nozzle 84 and trolley control unit 85.

[0096] (2-2-1) Traveling wheels 81

[0097] The traveling wheels 81 are configured to rotate via a drive mechanism (e.g., a motor) not shown in the diagram. Driven by the traveling wheels 81, the yarn receiving trolley 80 can travel relative to the multiple spinning units 2 respectively. The drive mechanism of the traveling wheels 81 is controlled by the trolley control unit 85.

[0098] (2-2-2) Straw 83

[0099] The straw 83 is a component with a tubular portion. An opening is formed at the tip 88 of the straw 83. The straw 83 is connected to a negative pressure source such as a blower 113. Thus, the opening at the tip 88 of the straw 83 generates a suction airflow. The straw 83 is supported in a rotatable manner. By rotating the straw 83, the tip 88 can approach or retract relative to the spinning device 22. In the event that the spun yarn 5 is cut, the straw 83 can draw in and capture the spun yarn 5 on the side of the spinning device 22 from the tip 88 at a position close to the spinning device 22.

[0100] (2-2-3) Suction nozzle 84

[0101] The suction nozzle 84 is a component with a tubular portion. An opening is formed at the tip 89 of the suction nozzle 84. The suction nozzle 84 is connected to a negative pressure source such as a blower 113. Thus, the suction nozzle 84 generates a suction airflow at the opening at the tip 89. The suction nozzle 84 is supported in a rotatable manner. By rotating the suction nozzle 84, the tip 89 can move towards or away from the winding device 25. In the event of a cut in the spun yarn 5, the suction nozzle 84 can draw in and capture the spun yarn 5 on the winding device 25 side from the tip 89 at a position close to the winding device 25.

[0102] (2-2-4) Yarn splicing device 82

[0103] After the cutting of the spinning yarn 5 occurs, the yarn splicing device 82 splices the spinning yarn 5 captured by the suction tube 83 on the spinning device 22 side with the spinning yarn 5 captured by the suction device 24 or the suction nozzle 84 on the winding device 25 side. In this embodiment, the yarn splicing device 82 is a splicing device that uses a swirling airflow to twist the yarn ends together. The yarn splicing device 82 is not limited to the splicing device described above; for example, it can also be a mechanical knotter. The yarn splicing device 82 is controlled by the trolley control unit 85.

[0104] The yarn receiving device 82 includes a yarn gathering rod (not shown). By actuating the yarn gathering rod, the spun yarn 5 captured by the suction device 24 is drawn into the yarn receiving device 82. The yarn receiving device 82 may also be configured to move in a direction that approaches or retracts radially relative to the yarn path.

[0105] When the yarn receiving trolley 80 moves to the working position, the yarn receiving device 82 is located downstream of the suction device 24 of the spinning unit 2, which is the target of yarn receiving. Additionally, the tip 89 of the suction nozzle 84 is in a retracted state relative to the winding device 25. Figure 9 In the state of solid line, the yarn splicing device 82 is located downstream of the top 89 of the suction nozzle 84.

[0106] (2-2-5) Car Control Section 85

[0107] The trolley control unit 85 centrally manages and controls all parts of the yarn-feeding trolley 80, performing yarn feeding in cooperation with the central control unit 115 and the unit control unit 28. When the trolley control unit 85 receives a yarn feeding request from the unit control unit 28, it controls each part of the yarn-feeding trolley 80 to move it to the working position corresponding to the spinning unit 2 that sent the request, and performs yarn feeding in that spinning unit 2, as detailed later. The trolley control unit 85 is connected to each part of the spinning unit 2 via signal lines (not shown). The trolley control unit 85 is composed of a well-known computer (not shown) with a CPU, ROM, RAM, etc.

[0108] (3) Regarding yarn splicing

[0109] (3-1) Overview of yarn splicing treatment

[0110] Spinning unit 2 performs splicing processing when the spun yarn 5 is cut. Spinning unit 2 performs one of the following splicing processes: "fixed capture splicing processing" or "moving capture splicing processing".

[0111] In the fixed capture and splicing process, such as Figure 8 As shown, the suction device 24 captures the spun yarn 5 on the side of the winding device 25. The suction device 24 makes the captured spun yarn 5 ready to be received by the yarn splicing device 82. Then, the yarn splicing device 82, which receives the spun yarn 5, performs the splicing. The detailed operation of each part in the fixed capture and splicing process will be described later.

[0112] In the process of moving capture and splicing, such as Figure 9 As shown, the suction nozzle 84 captures the spun yarn 5 on the side of the winding device 25. The suction nozzle 84 guides the captured spun yarn 5 so that it can be received by the yarn splicing device 82. Then, the yarn splicing device 82, which receives the spun yarn 5, performs the splicing. The detailed operation of each part in the moving capture and splicing process will be described later.

[0113] In any of the processes, the spun yarn 5 on the side of the spinning device 22 is captured by the suction tube 83, and the suction tube 83 can guide the spun yarn 5 so that the yarn splicing device 82 can take the spun yarn 5 into it.

[0114] When the spinning yarn 5 is cut, the unit control unit 28 determines whether to perform a fixed capture splicing process or a moving capture splicing process based on the amount S of the spinning yarn 5 retained on the yarn retention roller 51. Specifically, when the spinning yarn 5 is cut, the unit control unit 28 determines to perform a fixed capture splicing process if the amount S of the spinning yarn 5 retained on the yarn retention roller 51 is more than a predetermined amount, and determines to perform a moving capture splicing process if the amount S of the spinning yarn 5 retained on the yarn retention roller 51 is less than the predetermined amount.

[0115] Unlike moving yarn capture splicing, fixed capture splicing does not require the guiding action of the suction nozzle 84. Therefore, considering energy saving, it is best to always perform fixed capture splicing. On the other hand, if fixed capture splicing is performed when the amount of spinning yarn 5 stored on the yarn storage roller 51 is small, there is a concern that the suction device 24 may not be able to capture the spinning yarn 5 in time.

[0116] Therefore, by determining whether to perform a fixed capture splicing process or a moving capture splicing process based on the amount of yarn 5 stored on the yarn storage roller 51, it is possible to simultaneously achieve energy saving and reliable capture of the yarn 5 in the splicing process.

[0117] It should be noted that the above description is an example of how to decide whether to perform fixed capture splicing or moving capture splicing, and other criteria can also be used.

[0118] The aforementioned "situation where the spinning yarn 5 is cut" includes situations where the yarn monitoring device 26 detects a yarn defect contained in the spinning yarn 5 and the spinning unit 2 cuts the spinning yarn 5 to remove the defect, and situations where the spinning yarn 5 is cut for some reason. The situation where the spinning yarn 5 is cut is detected by the yarn monitoring device 26.

[0119] When the yarn monitoring device 26 detects a yarn defect in the spun yarn 5, the unit control unit 28 decides whether to cut the spun yarn 5 to remove the defect. Cutting the spun yarn 5 is achieved by stopping spinning through the spinning device 22. Cutting the spun yarn 5 is not limited to this method; it can also be achieved by stopping the drafting of the drafting device 21 (e.g., rotating the back roller pair 41), or by cutting the spun yarn 5 using a cutter provided in the spinning unit 2.

[0120] (3-2) Details of yarn splicing treatment

[0121] The following details regarding the splicing process will be explained using the 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 as an example. When the yarn monitoring device 26 detects a yarn defect in the spun yarn 5, and the spinning unit 22 stops spinning, the spun yarn 5... Figure 3 As shown, it is cut off between the spinning device 22 and the yarn storage device 23.

[0122] At an appropriate time after the yarn monitoring device 26 detects the cutting of the spinning yarn 5, the unit control unit 28 sends a yarn splicing request to the trolley control unit 85. Upon receiving the yarn splicing request, the trolley control unit 85 causes the yarn splicing trolley 80 to move to the spinning unit 2 where the spinning yarn 5 was cut. Furthermore, at an appropriate time after the yarn monitoring device 26 detects the cutting of the spinning yarn 5, the unit control unit 28 determines whether to perform a fixed-capture splicing process or a moving-capture splicing process based on the amount S of the spinning yarn 5 stored on the yarn storage roller 51.

[0123] (3-2-1) Fixed capture and splicing treatment

[0124] When the fixed capture and splicing process begins, the unit control unit 28 initiates "rotational speed control during yarn cutting". By executing rotational speed control during yarn cutting, the speed of the spun yarn 5 on the winding device 25 side as it passes through the suction device 24 decreases, thus making capture by the suction device 24 easier. Details regarding rotational speed control during yarn cutting will be described later.

[0125] When winding occurs in the winding device 25 based on the rotation of the winding tube 7a, the amount S of yarn 5 stored on the yarn storage roller 51 decreases. At this time, the yarn release rod 55... Figure 3 The yarn is shown stationary in the standby position P1. Thus, the yarn hanging component 53 contacts the spun yarn 5 unwound from the yarn holding roller 51 and applies tension to it.

[0126] After a predetermined time has elapsed since the second sensor 56b detected that the retention amount S of the spun yarn 5 has fallen below the second retention amount S2, the yarn release rod 55... Figure 4 The yarn moves to the yarn disengagement position P2 as shown. As a result, the yarn path of the spinning yarn 5 unwound from the yarn holding roller 51 is changed, and the spinning yarn 5 disengages from the yarn hanging part 53.

[0127] Almost simultaneously with the movement of the yarn release lever 55 toward the yarn release position P2, the gate 63 opens, and the suction device 24 begins to attract. When the suction device 24 begins to attract, the winding tube 7a stops rotating almost simultaneously. The attraction of the suction device 24 can also begin before the yarn release lever 55 begins to move toward the yarn release position P2.

[0128] At this time, the yarn retention roller 51 continues to rotate. Furthermore, since the spinning yarn 5 is detached from the yarn hanging member 53 and rotational speed control is being performed during yarn cutting, the tension of the unwound spinning yarn 5, which is being unwound as the yarn retention roller 51 rotates, decreases between the yarn retention roller 51 and the winding tube 7a. As a result, even before the yarn end of the spinning yarn 5 on the winding device 25 side detaches from the yarn retention roller 51, the suction device 24 can still... Figure 4 The image shows the midpoint of the slack spun yarn 5 being attracted. The unit control unit 28 determines whether the attraction device 24 has successfully captured the spun yarn 5 based on the detection result of the yarn capture detection sensor 64. It should be noted that if the detection sensitivity of the yarn capture detection sensor 64 is too high, it may falsely detect the yarn due to fly waste. Therefore, the spun yarn 5 can also be detected and the success of the attraction device 24 in capturing the spun yarn 5 can be determined by reversing the winding tube 7a while the gate 63 is open, or by moving the spun yarn 5 using the traverse device 73.

[0129] Then, the yarn release lever 55 returns to the standby position P1 at the appropriate time. Additionally, the yarn retention roller 51 stops rotating. Figure 5 Also shown is the yarn receiving trolley 80 that arrives at the spinning unit 2 according to the yarn receiving requirements.

[0130] When the yarn receiving carriage 80 arrives, the suction tube 83 moves its tip 88 towards a position where it can capture the yarn 5 on the side of the spinning device 22. Almost simultaneously, the spinning device 22 resumes feeding the yarn 5. In addition, the yarn holding roller 51 and the yarn hanging component 53 also resume rotating.

[0131] like Figure 6 As shown, the suction tube 83 guides the captured yarn 5 from the spinning device 22 to the yarn receiving device 82. At this time, the yarn release rod 55 remains in the standby position P1. Thus, the yarn 5 drawn from the spinning device 22 is hooked onto the yarn hanging member 53, and the rotating yarn hanging member 53 winds the yarn 5 onto the yarn storing roller 51.

[0132] Before a predetermined time elapses after the spinning yarn 5 begins winding onto the yarn retention roller 51, low-quality spun yarn 5 remains on the yarn retention roller 51, a residue formed when spinning initially resumed. To remove and discard this low-quality spun yarn 5 from the yarn retention roller 51 using a suction tube 83, as... Figure 7 As shown, the yarn release lever 55 moves to the yarn release position P2.

[0133] After all the yarn 5 to be removed has been unwound from the yarn holding roller 51, the yarn release rod 55 moves to... Figure 8 The standby position P1 is shown. As a result, the spinning yarn 5 is hung on the yarn hanging part 53 again, and the amount of spinning yarn 5 stored on the yarn storage roller 51 increases.

[0134] In this state, the yarn splicing device 82 splices the yarn 5 attracted by the attraction device 24 on the winding device 25 side with the yarn 5 on the spinning device 22 side.

[0135] During the splicing process, excess yarn 5 is cut off in the splicing device 82. This cutting separates portions of the yarn with defects detected by the yarn monitoring device 26 from the yarn 5 on the winding device 25 side. The cut excess yarn 5 is then sucked in by the suction device 24 or the suction tube 83 and discarded.

[0136] Almost simultaneously with the completion of yarn splicing, the winding tube 7a resumes rotation in the direction of winding the spun yarn 5. The gate 63 closes at the appropriate time after the yarn splicing is completed. Thus, the spinning unit 2 returns to... Figure 2 The usual state.

[0137] When the rotational speed of the winding tube 7a is reduced, the tension of the spinning yarn 5 on the winding device 25 side tends to become unstable. Consequently, the position where the spinning yarn 5 is guided by the yarn guide 78 towards the outer periphery of the package 7 also becomes unstable, thus raising the risk of "end-face drop" where the spinning yarn 5 becomes entangled and detaches from the package width of the package 7. To suppress end-face drop, the traverse device 73 can also narrow the traverse amplitude when the winding tube 7a rotates and winds the spinning yarn 5 compared to normal. For example, it is preferable to set the traverse amplitude to less than half of the traverse amplitude before the spinning yarn 5 is cut (maximum traverse amplitude). In this case, the reduction in traverse amplitude continues until the rotation of the package 7 stops. Alternatively, the traverse device 73 can not only narrow the traverse amplitude but also reduce the traverse speed.

[0138] Even if the suction device 24 successfully captures the yarn, if the yarn defect contained in the yarn 5 on the package 7 side is long, the winding tube 7a can rotate in the opposite direction to the winding direction for a predetermined time. Thus, by unwinding the yarn 5 from the package 7 and attracting it with the suction device 24, the yarn defect can be removed.

[0139] (3-2-2) Moving capture yarn splicing process

[0140] When the moving capture and splicing process begins, the winding tube 7a continues the rotation up to this point (without slowing down). 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 maintains the gate 63 closed when it is closed, and closes the gate 63 when it is open. Consequently, it is possible to prevent the yarn end of the spun yarn 5 on the winding device 25 side from being sucked into the suction port 62 of the suction device 24. Afterwards, the yarn end of the spun yarn 5 on the winding device 25 side moves to the vicinity or outer circumference of the package 7 and is completely wound onto the package 7. It should be noted that the gate 63 can be closed at any appropriate time.

[0141] When the yarn receiving trolley 80 arrives, the suction nozzle 84... Figure 9 The dotted line indicates that the tip 89 approaches the winding device 25. In this state, the winding rotation device 72 of the winding device 25 rotates the winding tube 7a in the opposite direction to the direction of winding the spun yarn 5. As a result, the suction nozzle 84 can capture the spun yarn 5 on the winding device 25 side. The rotation of the package 7a in the opposite direction continues until all the portion of the spun yarn 5 containing yarn defects on the winding device 25 side is attracted by the suction nozzle 84. When the suction nozzle 84 attracts the portion of the spun yarn 5 containing yarn defects, it causes the tip 89 to retract from the winding device 25. As a result, the spun yarn 5 on the winding device 25 side is guided to the splicing device 82.

[0142] In this state, the yarn splicing device 82 splices the yarn 5 on the winding device 25 side attracted by the suction nozzle 84 with the yarn 5 on the spinning device 22 side.

[0143] During splicing, excess yarn 5 is cut off in the splicing device 82. This cutting separates the portion of the yarn with defects detected by the yarn monitoring device 26 from the yarn 5 on the winding device 25 side. The cut excess yarn 5 is then sucked in by the suction nozzle 84 or the suction tube 83 and discarded.

[0144] Almost simultaneously with the completion of yarn splicing, the winding tube 7a resumes rotation in the winding direction. The gate 63 closes at the appropriate time after the yarn splicing is complete. Thus, the spinning unit 2 returns to... Figure 2 The usual state.

[0145] Alternatively, before the yarn 5 on the winding device 25 side is fully wound onto the winding tube 7a, the rotational speed of the winding tube 7a in the winding direction is lower than before cutting. Therefore, since the yarn end of the yarn 5 on the winding device 25 side easily separates from the yarn 5 on the outer periphery of the package 7, the suction nozzle 84 can easily capture the yarn end. For the same reason, the rotation of the package 7 can also be stopped just before the yarn 5 on the winding device 25 side is about to be fully wound onto the package 7.

[0146] In the moving yarn-catching process, the traverse device 73 can make the traverse amplitude when the package 7 rotates and winds the spun yarn 5 narrower than usual, and can also reduce the traverse speed. As a result, the occurrence of end-face drop can be suppressed, and the suction nozzle 84 can easily catch the yarn end.

[0147] (3-3) Rotation speed control during yarn cutting

[0148] (3-3-1) Overview of Control

[0149] In the control of rotational speed during yarn cutting, the unit control unit 28 controls each part as described below.

[0150] When the yarn 5 between the spinning device 22 and the winding device 25 is cut (in other words, when the yarn monitoring device 26 detects the cutting of the yarn 5), the unit control unit 28 performs a process to change the rotational speed Vb of the winding tube 7a from the first speed V1 up to that point to the second speed V2. Hereinafter, for convenience, this process will be referred to as the first process. The second speed V2 is a rotational speed that is slower than the first speed V1 and is set based on information related to the thickness of the yarn 5.

[0151] The unit control unit 28 determines whether the thickness T of the spinning yarn 5 is above or below a predetermined threshold thickness Tth based on information related to the thickness of the spinning yarn 5. If the thickness T of the spinning yarn 5 is above or below the threshold thickness Tth, after performing the first process, when the first sensor 56a of the yarn accumulation detection sensor 56 detects that the accumulation amount S of the spinning yarn 5 on the yarn accumulation roller 51 is less than the predetermined first accumulation amount S1, the unit control unit 28 performs a process that changes the rotation speed Vb of the winding tube 7a from the second speed V2 up to that point to a third speed V3. Hereinafter, for convenience, this process will be referred to as the second process. The third speed V3 is a rotation speed that is slower than the second speed V2 and is set based on information related to the thickness of the spinning yarn 5. Furthermore, after performing the second process, the unit control unit 28 stops the rotation of the winding tube 7a when the second sensor 56b of the yarn accumulation detection sensor 56 detects that the accumulation amount S is less than a predetermined second accumulation amount S2, which is less than the first accumulation amount S1. Additionally, when the thickness T of the spun yarn 5 is less than the threshold thickness Tth, after performing the first process, the unit control unit 28 stops the rotation of the winding tube 7a when the second sensor 56b of the yarn accumulation detection sensor 56 detects that the accumulation amount S is less than the second accumulation amount S2.

[0152] When the spun yarn 5 is cut between the spinning device 22 and the winding device 25, the unit control unit 28 changes the rotational speed Vr of the yarn retention roller 51 from the fourth speed V4 up to that point to the fifth speed V5. The fifth speed V5 is a rotational speed that is slower than the fourth speed V4 and is set based on information related to the thickness of the spun yarn 5.

[0153] The unit control unit 28 decelerates the rotational speed Vb of the winding tube 7a towards the sixth speed V6 when the yarn release lever 55 acts on the spinning yarn 5. More specifically, the rising of the yarn release lever 55 and the deceleration of the winding tube 7a towards the sixth speed V6 occur almost simultaneously. Therefore, since the sixth speed V6 of the winding tube 7a begins before the yarn release lever 55 rises and contacts the spinning yarn 5, the tension of the spinning yarn 5 can be reduced.

[0154] The unit control unit 28 uses the count information received by the operation unit 117 as "information related to the thickness of the spun yarn 5". Furthermore, the information related to the thickness of the spun yarn 5 refers to whether the count of the spun yarn 5 is less than or equal to Ne15.

[0155] (3-3-2) Control Flow

[0156] Next, a flowchart is used to illustrate the control process of rotation speed control during yarn cutting. Figure 11 This is a flowchart of the rotation speed control during yarn cutting.

[0157] The operation unit 117 receives the count information and threshold thickness Tth of the spinning yarn 5 and sends it to the unit control unit 28 before the rotation speed control starts when the yarn is cut.

[0158] The first speed V1, the second speed V2, the third speed V3, the fourth speed V4, and the fifth speed V5 are predetermined based on the yarn count information of the spinning yarn 5 received by the operation unit 117, etc., when the spinning unit 2 is started. Specifically, the unit control unit 28 refers to a table that records the yarn count of the spinning yarn 5 and each speed accordingly to determine the first speed V1, the second speed V2, the third speed V3, the fourth speed V4, and the fifth speed V5 respectively. Figure 12 This is a graph showing tables corresponding to various speeds for each yarn count in the spinning yarn 5. These tables are stored in a storage unit (not shown) within the unit control unit 28. It should be noted that... Figure 12 The rotational speed shown is an example, and the first speed V1, the second speed V2, the third speed V3, the fourth speed V4, and the fifth speed V5 are not limited to this.

[0159] like Figure 12 As shown, in this embodiment, the speeds, except for the first speed V1 and the fourth speed V4, differ between the case where the spinning yarn 5 has a count of Ne15 or less and the case where the spinning yarn 5 has a count greater than Ne15. More specifically, the second speed V2, the third speed V3, and the fifth speed V5 are set such that the speed of the spinning yarn 5 with a small count (coarse) is less than or equal to the speed of the spinning yarn 5 with a large count (fine). Hereinafter, for convenience, the speed group for the case where the spinning yarn 5 has a count of Ne15 or less will be referred to as Group 1, and the speed group for the case where the spinning yarn 5 has a count greater than Ne15 will be referred to as Group 2.

[0160] Let's assume that before the rotational speed control starts when the yarn is cut, the rotational speed Vb of the winding tube 7a is the first speed V1, and the rotational speed Vr of the yarn retention roller 51 is the fourth speed V4.

[0161] The unit control unit 28 starts controlling the rotation speed during yarn cutting (start) at the same time as the fixed capture and splicing process begins.

[0162] In step S100, the unit control unit 28 determines which speed group from group 1 and group 2 to use in subsequent processing based on information related to the thickness of the spun yarn 5, and proceeds to step S110. Specifically, the unit control unit 28 uses the speed group of group 1 in subsequent processing when the yarn 5 has a count of Ne15 or less, and uses the speed group of group 2 in subsequent processing when the yarn 5 has a count finer than Ne15.

[0163] In step S110, the unit control unit 28 changes the rotational speed Vb of the winding tube 7a from the first speed V1 up to that point to the second speed V2, and proceeds to step S120. In other words, in step S110, the unit control unit 28 performs the first process.

[0164] In step S120, the unit control unit 28 changes the rotational speed Vr of the yarn holding roller 51 from the fourth speed V4 up to that point to the fifth speed V5, and proceeds to step S130. Step S120 may also be performed before step S110.

[0165] In step S130, the unit control unit 28 proceeds to step S140 if the thickness T of the spun yarn 5 is above a predetermined threshold thickness Tth (yes), and proceeds to step S160 if the spun yarn 5 is not above the predetermined threshold thickness Tth (no). The threshold thickness Tth is Ne15, but it is not a limiting factor.

[0166] In step S140, the unit control unit 28 causes the process to proceed to step S150 when the amount of yarn 5 stored in the spinning yarn 5 is less than the first amount of yarn stored in the spinning yarn 5 (yes), and repeats the process of step S140 when the amount of yarn 5 stored in the spinning yarn 5 is greater than the first amount of yarn stored in the spinning yarn 5 (no).

[0167] When the yarn is cut, there may be a situation where the amount of yarn 5 retained S is less than the first amount S1. Therefore, the unit control unit 28 may also perform the same process as step S140 immediately after step S100 to decide whether to proceed to step S150.

[0168] In step S150, the unit control unit 28 changes the rotational speed Vb of the winding tube 7a from the second speed V2 up to that point to the third speed V3, and proceeds to step S160. In other words, in step S150, the unit control unit 28 performs the second process.

[0169] In step S160, the unit control unit 28 causes the process to proceed to step S170 when the amount of yarn 5 stored S is less than the second amount of yarn stored S2 (yes), and repeats the process of step S160 when the amount of yarn 5 stored S is greater than the second amount of yarn stored S2 (no).

[0170] The unit control unit 28 may also proceed to step S170 in step S160 after a predetermined time has elapsed since the detection that the amount of yarn 5 remaining is less than the second amount of yarn remaining S2. For example, the unit control unit 28 may also proceed to step S170 after the second sensor 56b detects that the amount of yarn 5 remaining S has become less than the second amount of yarn remaining S2, and before moving to the yarn departure position P2.

[0171] In step S170, the unit control unit 28 decelerates the rotational speed Vb of the winding tube 7a towards the sixth speed V6 just before the yarn release lever 55 is about to act on the spinning yarn 5, and proceeds to step S180. In step S170, the unit control unit 28 may also decelerate the rotational speed Vb of the winding tube 7a towards the sixth speed V6, which is slower than the fifth speed V5, either when the yarn release lever 55 is about to act on the spinning yarn 5 or immediately after the yarn release lever 55 acts on the spinning yarn 5. "Just before the yarn release lever 55 is about to act on the spinning yarn 5" means approximately one second before the yarn release lever 55 acts on the spinning yarn 5. "Just after the yarn release lever 55 acts on the spinning yarn 5" means approximately one second after the yarn release lever 55 acts on the spinning yarn 5.

[0172] Here, the phrase "when the yarn release lever 55 acts on the spinning yarn 5" refers to the moment when the yarn release lever 55 moves towards the yarn release position P2 after the second sensor 56b detects that the accumulation amount S of the spinning yarn 5 is below the second accumulation amount S2 and a predetermined time has elapsed. Therefore, at this moment, the unit control unit 28 moves the yarn release lever 55 towards the yarn release position P2 and decelerates the rotational speed Vb of the winding tube 7a towards the sixth speed V6 just before the yarn release lever 55 is about to act on (contact) the spinning yarn 5.

[0173] In step S180, the unit control unit 28 stops the rotation of the winding tube 7a (in other words, sets the rotational speed Vb of the winding tube 7a to zero) and stops the rotational speed control during yarn cutting (end). The sixth speed V6 can also be zero. In this case, the unit control unit 28 processes steps S170 and S180 simultaneously.

[0174] (3-3-3) Actions of each part

[0175] Next, a time diagram is used to illustrate the actions of each part of the rotation speed control during yarn cutting. Figure 13 It is a time diagram showing the actions of each part in the rotation speed control when the yarn is cut.

[0176] When the yarn is cut, the rotation speed control starts (t1), the rotation speed Vb of the winding tube 7a changes from the first speed V1 to the second speed V2 set based on information related to the thickness of the spun yarn 5 (step S110), and the rotation speed Vr of the yarn retention roller 51 changes from the fourth speed V4 to the fifth speed V5 set based on information related to the thickness of the spun yarn 5 (step S120).

[0177] Next, when the thickness T of the spun yarn 5 is above the threshold thickness Tth, and the amount S of the spun yarn 5 becomes less than the first amount S1 (t2), the rotational speed Vb of the winding tube 7a changes from the second speed V2 to the third speed V3 set based on information related to the thickness of the spun yarn 5 ("Yes" in steps S130 and S140, step S150). When the thickness T of the spun yarn 5 is less than the threshold thickness Tth, as... Figure 13 As shown by the dotted line, the rotational speed Vb of the winding tube 7a does not change from the second speed V2 (No in steps S130 and S140).

[0178] Next, if the amount of yarn 5 retained S becomes less than the second amount S2 (t3), then before the yarn release rod 55 acts on the yarn 5 (t4), the rotational speed Vb of the winding tube 7a becomes the sixth speed V6 ("Yes" in step S160, step S170). Figure 13 In the example, the sixth speed V6 is zero. The timing t4, before the yarn release lever 55 acts on the spinning yarn 5, can be set to be a predetermined time elapsed from t3. This predetermined time can also be zero (in other words, t3 = t4).

[0179] After that, the winding tube 7a stops rotating (step S180, end).

[0180] (4) Variations

[0181] (4-1)

[0182] In the above embodiment, the unit control unit 28 uses the yarn count information received by the operation unit 117 as information related to the thickness of the spun yarn 5. However, the unit control unit 28 may also use the detection result of the yarn monitoring device 26 as information related to 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 related to the thickness of the spun yarn 5.

[0183] (4-2)

[0184] In the above embodiment, the amount S of yarn 5 stored in the yarn storage device 23 is reduced by the yarn release rod 55, but the amount S of yarn 5 stored in the yarn storage device 23 can also be reduced by stopping the rotation of the yarn hanging member 53.

[0185] (4-3)

[0186] In the above embodiments, the information related to the thickness of the spun yarn 5 refers to whether the count of the spun yarn 5 is less than Ne15. However, the information related to the thickness of the spun yarn 5 is not limited to this, and the count other than Ne15 can also be used as a reference.

[0187] (4-4)

[0188] 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 can also be variable values. Specifically, the unit control unit 28 can calculate at least one of the second speed V2, the third speed V3, and the fifth speed V5 in the rotation speed control each time the yarn is cut based on a preset formula.

[0189] (4-5)

[0190] In the above embodiment, the unit control unit 28 maintains the rotational speed Vb of the winding tube 7a at the second speed V2 by proceeding to step S160 when the spinning yarn 5 is less than a predetermined threshold thickness Tth. However, this control can also be implemented by other methods. Specifically, when the spinning yarn 5 is less than the predetermined threshold thickness Tth, the process can proceed from step S130 to step S140 by setting the third speed V3 to the same value as the second speed V2, and the rotational speed Vb of the winding tube 7a can be maintained at the second speed V2. It should be noted that even when the spinning yarn 5 is less than the predetermined threshold thickness Tth, the second speed V2 can be set to a value different from the third speed V3.

[0191] (4-6)

[0192] In the above embodiment, the amount of yarn 5 stored S is obtained by using the detection result of the yarn storage amount detection sensor 56. However, the amount of yarn 5 stored S can also be obtained by other methods. Specifically, the unit control unit 28 can also use the value calculated by subtracting the amount of yarn 5 wound by the winding tube 7a from the amount of yarn 5 stored by the yarn storage device 23 as the amount of yarn 5 stored in the rotation speed control when the yarn is cut as the amount of yarn 5 stored S.

[0193] (4-7)

[0194] In the above embodiments, the second speed V2, the third speed V3 and the fifth speed V5 are set to different speeds based on information related to the thickness of the spun yarn 5, but any one of the second speed V2, the third speed V3 and the fifth speed V5 can also be the same regardless of the information related to the thickness of the spun yarn 5.

[0195] (4-8)

[0196] The rotational speed Vb is set to three stages: speed 1 V1, speed 2 V2, and speed 3 V3, but it is not limited to these; more than four stages can also be set. Similarly, the rotational speed Vr is set to two stages: speed 4 V4 and speed 5 V5, but it is not limited to these; more than three stages can also be set.

[0197] (4-9)

[0198] The unit control unit 28 can also set at least one of a fifth speed V5 and a sixth speed V6 during the rotational speed control when the yarn is cut, based on information related to the thickness of the spun yarn 5 and the tension detected by the spinning sensor 27. Specifically, the higher the tension of the spun yarn 5, the lower the unit control unit 28 sets at least one of the fifth speed V5 and the sixth speed V6. More specifically, for example, if the tension detected by the spinning sensor 27 is greater than a predetermined value, a speed smaller than the fifth speed V5 determined based on the information related to the thickness of the spun yarn 5 is set as a new fifth speed V5. Conversely, for example, if the tension detected by the spinning sensor 27 is less than a predetermined value, a speed larger than a predetermined sixth speed V6 (e.g., sixth speed V6 = 0) is set as a new sixth speed V6.

[0199] (5) Features of the implementation method

[0200] The above-described embodiments can also be described as follows.

[0201] A spinning machine (e.g., spinning machine 1) includes a spinning device (e.g., spinning device 22), a winding device (e.g., winding device 25), a yarn holding device (e.g., yarn holding device 23), a yarn splicing device (e.g., yarn splicing device 82), a suction device (e.g., suction device 24), and a control device (e.g., unit control unit 28). The spinning device generates yarn (e.g., spun yarn 5) by spinning a fiber bundle (e.g., fiber bundle 4b) and supplies the yarn. The winding device winds the yarn supplied from the spinning device onto a rotating winding tube (e.g., winding tube 7a) to form a package (e.g., package 7). The yarn holding device is positioned midway along the yarn path formed between the spinning device and the winding device, and holds the yarn supplied by the spinning device. The control device controls the rotation of the winding device and the yarn holding device. The yarn splicing device splices the yarn on the package side with the yarn on the spinning device side. The suction device is located downstream of the yarn storage device and upstream of the yarn splicing device to attract and capture the yarn on the package side. When the yarn is cut between the spinning device and the winding device, the control device performs a first process that changes the rotational 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 is set based on information related to the thickness of the yarn.

[0202] The thicker the yarn, the less yarn is retained in the yarn holding device. Therefore, when a thick yarn is cut, if the winding tube is driven at the same rotational speed as in the case of a thin yarn, the time until all the retained yarn is unwound from the yarn holding device becomes shorter. As a result, sometimes the suction device cannot prepare in time and fails to capture the yarn. On the other hand, if the winding tube is always driven at a rotational speed that reliably captures the yarn when it is thick, the cycle time cannot be shortened.

[0203] In this spinning machine, since the rotational speed of the winding tube after yarn cutting (the second speed) is set based on information related to the yarn thickness, the time until all the stored yarn is unwound from the yarn holding device also varies based on this information. Therefore, by setting the second speed lower for thicker yarns, it is possible to ensure that the time from yarn cutting to complete unwinding from the yarn holding device is longer for thicker yarns. This ensures sufficient time from yarn cutting to preparation for yarn capture, even with thicker yarns, thus guaranteeing a high success rate in capturing the yarn end during the splicing process.

[0204] Furthermore, the second speed is higher when the yarn is finer than when the yarn is thicker. In this case, because the yarn is finer, a larger amount of yarn is retained in the yarn retention device, and the time from when the yarn is cut until all the retained yarn is unwound from the yarn retention device is longer. As a result, even with finer yarn, the success rate of yarn end capture during splicing is ensured. In addition, the higher second speed when the yarn is finer helps to prevent the cycle time from becoming longer.

[0205] Therefore, this spinning machine can ensure the success rate of yarn end capture during the splicing process while suppressing the increase in cycle time.

[0206] The spinning machine also includes a first detection unit (e.g., yarn accumulation detection sensor 56) for detecting the amount of yarn accumulated on the yarn accumulation device. The control device determines whether the yarn thickness is above a predetermined threshold thickness based on information related to the yarn's thickness. If the yarn thickness is above the predetermined threshold thickness (threshold thickness Tth), after performing the first process, when the first detection unit detects that the accumulation amount is less than a predetermined first accumulation amount (e.g., first accumulation amount S1), the control device performs a second process, changing the rotation speed of the winding tube from a second speed to a third speed (e.g., third speed V3) that is slower than the second speed and set based on information related to the yarn thickness. After performing the second process, when the first detection unit detects that the accumulation amount is less than a predetermined second accumulation amount (e.g., second accumulation amount S2), the control device stops the rotation of the winding tube. In addition, when the yarn thickness is less than the threshold thickness, after the control device performs the first process, when the first detection unit detects that the amount of yarn left is less than the second amount of yarn left, the rotation of the winding tube is stopped.

[0207] In this spinning machine, when the yarn thickness is above a threshold (i.e., the yarn is thick), the rotational speed decreases in stages due to a reduction in the amount of yarn retained on the yarn retention device. Therefore, according to this spinning machine, it is possible to more effectively ensure the success rate of yarn end capture during the splicing process while suppressing the increase in cycle time.

[0208] The yarn retention device has a yarn retention roller (e.g., yarn retention roller 51) capable of retaining yarn by winding it around the outer periphery. When the yarn is cut between the spinning device and the winding device, the control device changes the rotational speed of the yarn retention 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 related to the thickness of the yarn.

[0209] In this spinning machine, the difference in rotational speed between the yarn holding roller and the winding tube can be kept within an appropriate range. This prevents the yarn from twisting between the yarn holding device and the winding device.

[0210] The yarn holding device also includes a yarn actuating component (e.g., yarn release lever 55) that acts on the yarn to reduce the amount of yarn held on the yarn holding roller based on the rotation of the yarn holding roller. A control device decelerates the rotational speed of the winding tube when the yarn actuating component acts on the yarn, the rotational speed of the winding tube just before the yarn actuating component acts on the yarn, or the rotational speed of the winding tube immediately after the yarn actuating component acts on the yarn, towards a sixth speed (e.g., sixth speed V6) that is slower than the fifth speed.

[0211] In this spinning machine, the difference in rotational speed between the yarn holding roller and the winding tube when the yarn action component acts on the yarn is within an appropriate range. This prevents the yarn tension from increasing between the yarn holding device and the winding device. Therefore, according to this spinning machine, yarn cutting between the yarn holding device and the winding device can be prevented. Furthermore, according to this spinning machine, the suction device can easily capture the yarn.

[0212] The spinning machine also includes a second detection unit (e.g., spinning sensor 27) for detecting yarn tension. The control device sets at least one of a fifth speed and a sixth speed based on information related to the yarn thickness and the tension detected by the second detection unit.

[0213] In this spinning machine, at least one of the fifth and sixth speeds is set based on tension. Generally, yarns with high tension are highly rigid and difficult to bend. When the yarn tension is high, the suction device may fail to capture the yarn. Therefore, by setting at least one of the fifth and sixth speeds based on information related to the yarn thickness and tension, the suction device can capture the yarn more easily.

[0214] The spinning machine has an operation unit (e.g., operation unit 117) that receives yarn count information. The control device uses the yarn count information received by the operation unit as information related to the thickness of the yarn.

[0215] The control device is equipped with a yarn monitoring device (e.g., yarn monitoring device 26) for detecting the thickness of the yarn. The control device uses the detection results of the yarn monitoring device as information related to the thickness of the yarn.

[0216] In this spinning machine, the operator does not need to provide yarn count information to the operating unit. Therefore, this spinning machine can more effectively suppress the increase in cycle time.

[0217] Information related to yarn thickness refers to whether the yarn count is below Ne15.

[0218] 2. Second Implementation Method

[0219] (1) Overall structure

[0220] The unit control unit 28 can also perform the second process described above (step S150) regardless of the thickness T of the spinning yarn 5, and after performing the second process, when the second sensor 56b of the yarn retention detection sensor 56 detects that the retention amount is less than the second retention amount S2 (step S160), the rotation of the winding tube 7a is stopped.

[0221] Figure 14 This is a flowchart illustrating the rotational speed control during yarn cutting, executed by the unit control unit 28 of the spinning machine 1 in the second embodiment. Figure 14In the middle, to and Figure 11 Refer to the attached diagram for flowcharts that are identical to or have the same corresponding processing labels. For example... Figure 14 As shown, the control flow for controlling the rotational speed during yarn cutting executed by the unit control unit 28 of the spinning machine 1 in the second embodiment is different from the one in that it does not have step S130. Figure 11 The flowcharts shown are different.

[0222] (2) Features of the implementation method

[0223] The above-described embodiments can also be described as follows.

[0224] The spinning machine also has a first detection unit for detecting the amount of yarn stored on the yarn storage device. After the control device performs the first process, when the first detection unit detects that the amount of yarn stored is less than the specified first amount of yarn stored, it changes the rotation speed of the winding tube from the second speed to a third speed that is slower than the second speed and is set based on information related to the thickness of the yarn.

[0225] In this spinning machine, the rotational speed is reduced in stages due to the decrease in the amount of yarn retained on the yarn retention device. Therefore, according to this spinning machine, it is possible to more effectively ensure the success rate of yarn end capture during the splicing process while suppressing the increase in cycle time.

[0226] 3. Third Implementation Method

[0227] (1) Overall structure

[0228] The unit control unit 28 can also set the second speed in the first process based on the tension of the spinning yarn 5 detected by the spinning sensor 27.

[0229] (2) Features of the implementation method

[0230] The above-described embodiments can also be described as follows.

[0231] A spinning machine (e.g., spinning machine 1) includes a spinning device (e.g., spinning device 22), a winding device (e.g., winding device 25), a yarn holding device (e.g., yarn holding device 23), a yarn splicing device (e.g., yarn splicing device 82), a suction device (e.g., suction device 24), and a control device (e.g., unit control unit 28). The spinning device generates yarn (e.g., spun yarn 5) by spinning a fiber bundle (e.g., fiber bundle 4b) and supplies the yarn. The winding device winds the yarn supplied from the spinning device onto a rotating winding tube (e.g., winding tube 7a) to form a package (e.g., package 7). The yarn holding device is disposed on the yarn path formed between the spinning device and the winding device and holds the yarn supplied by the spinning device. The control device controls the rotation of the winding device and the rotation of the yarn holding device. The yarn splicing device splices the yarn on the package side with the yarn on the spinning device side. The suction device is located downstream of the yarn storage device and upstream of the yarn splicing device to attract and capture the yarn on the package side. When the yarn is cut between the spinning device and the winding device, the control device performs a first process that changes the rotational 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 yarn tension.

[0232] Corrugated yarns are more rigid than fine yarns. Therefore, in a spinning apparatus, the tension of a coarser yarn is more easily increased. In the first embodiment, the second speed is set based on information related to the yarn thickness, but for the reasons mentioned above, the rotational speed of the winding tube after yarn cutting, i.e., the second speed, can be set using the yarn tension. Therefore, similar to the spinning machine of the first embodiment, the spinning apparatus of the third embodiment can also suppress the increase of cycle time while ensuring the success rate of yarn end capture during the splicing process. It should be noted that the third and fifth speeds in the first embodiment can also be set using the yarn tension.

[0233] 4. Summary

[0234] The present invention has been described above as one embodiment, but the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. In particular, the various embodiments and modifications described in this specification can be arbitrarily combined as needed.

Claims

1. A spinning machine, characterized in that, have: A spinning device that generates yarn by spinning a fiber bundle 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 retention device is disposed on the yarn path formed between the spinning device and the winding device to retain the yarn supplied by the spinning device. A yarn splicing device that splices the yarn on the package side to the yarn on the spinning device side; An attraction device is located downstream of the yarn storage device and upstream of the yarn receiving device to attract and capture the yarn on the package side. and A control device that controls the rotation of the winding device and the yarn retention device. When the yarn is cut between the spinning device and the winding device, the control device performs a first process that changes the rotational 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 related to the thickness of the yarn.

2. The spinning machine according to claim 1, characterized in that, It also includes a first detection unit for detecting the amount of yarn stored on the yarn storage device. After performing the first process, when the first detection unit detects that the amount of accumulation is less than the predetermined first amount of accumulation, the control device changes the rotation speed of the winding tube from the second speed to a third speed that is slower than the second speed and is set based on information related to the thickness of the yarn.

3. The spinning machine according to claim 1, characterized in that, It also includes a first detection unit for detecting the amount of yarn stored on the yarn storage device. The control device determines whether the yarn is above a predetermined threshold thickness based on information related to the yarn's thickness. When the thickness of the yarn is above a predetermined threshold thickness. After performing the first process, when the first detection unit detects that the amount of yarn stored is less than the predetermined first amount of yarn stored, the control device performs a second process, changing the rotational speed of the winding tube from the second speed to a third speed that is slower than the second speed and is set based on information related to the thickness of the yarn. After performing the second process, when the first detection unit detects that the accumulated amount is less than a predetermined second accumulated amount, the control device stops the rotation of the winding tube, wherein the second accumulated amount is the accumulated amount less than the first accumulated amount. If the yarn thickness is less than the threshold thickness, after performing the first process, the control device stops the rotation of the winding tube when the first detection unit detects that the amount of yarn stored is less than the second amount of yarn stored.

4. The spinning machine according to any one of claims 1 to 3, characterized in that, The yarn retention device has a yarn retention roller capable of retaining yarn by winding it around the outer periphery. When the yarn is cut between the spinning device and the winding device, the control device changes the rotational speed of the yarn retention roller from a fourth speed to a fifth speed that is slower than the fourth speed and is set based on information related to the thickness of the yarn.

5. The spinning machine according to claim 4, characterized in that, The yarn retention device further includes a yarn actuating component that acts on the yarn to reduce the amount of yarn retained on the yarn retention roller due to the rotation of the yarn retention roller. The control device causes the rotational speed of the winding tube when the yarn action component acts on the yarn, the rotational speed of the winding tube just before the yarn action component acts on the yarn, or the rotational speed of the winding tube just after the yarn action component acts on the yarn to decrease to a sixth speed, which is slower than the fifth speed.

6. The spinning machine according to claim 5, characterized in that, It also includes a second detection unit for detecting 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.

7. The spinning machine according to any one of claims 1 to 6, characterized in that, It has an operation unit that accepts the yarn count information. The control device uses the yarn count information received by the operation unit as information related to the thickness of the yarn.

8. The spinning machine according to any one of claims 1 to 6, characterized in that, It is equipped with a yarn monitoring device for detecting the thickness of the yarn. The control device uses the detection results of the yarn monitoring device as information related to the thickness of the yarn.

9. The spinning machine according to any one of claims 1 to 8, characterized in that, Information related to the yarn thickness refers to whether the yarn count is less than Ne15.

10. A spinning machine, characterized in that, have: A spinning device that generates yarn by spinning a fiber bundle 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 retention device is disposed on the yarn path formed between the spinning device and the winding device to retain the yarn supplied by the spinning device. A yarn splicing device that splices the yarn on the package side to the yarn on the spinning device side; An attraction device is located downstream of the yarn storage device and upstream of the yarn receiving device to attract and capture the yarn on the package side. and A control device that controls the rotation of the winding device and the yarn retention device. When the yarn is cut between the spinning device and the winding device, the control device performs a first process that changes the rotational 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.

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