Yarn winding device

Abstract

The invention provides a yarn winding device which enables the winding amount of yarn to be constant even if the speed of the yarn in the process of forming the package is different. The winding unit (2) is provided with a yarn supply section (6), a package forming section (8), and a control device (25). The yarn supply section (6) supplies a yarn (Y). The package forming unit (8) forms a package (30) by winding a yarn (Y). The control device (25) controls the package forming unit (8). The control device (25) executes a deceleration stop control for the package forming unit (8) to decelerate the yarn speed of the yarn (Y) from the yarn speed during the formation of the package (30) and to make the yarn speed zero when the length of the yarn (Y) wound around the package (30) becomes the package winding completion length. In this case, the start timing of the deceleration stop control is determined on the basis of the package winding completion length, the yarn speed during the formation of the package (30), and the length of the yarn wound around the package (30).

Description

Technical Field

[0001] This invention relates to a yarn winding device for forming a package by winding yarn. Background Technology

[0002] A yarn winding device is known that winds yarn supplied from a yarn supply unit onto a winding bobbin to form a package. In this yarn winding device, it is required that the amount of yarn wound at the end of winding the package does not deviate from a predetermined amount. Therefore, when the amount of yarn wound into the package becomes slightly smaller than the predetermined amount, the deceleration of the package begins (for example, see Japanese Patent JP H05-286646A). Summary of the Invention

[0003] The problem the invention aims to solve

[0004] In yarn winding devices, the yarn speed is sometimes changed during the formation of the package, depending on the winding conditions. In this case, as mentioned above, if the timing for slowing down the package is determined solely by considering the amount of yarn wound onto the package, the amount of yarn wound at the end of the winding process will deviate. Specifically, the amount of yarn wound onto the package at the end of the winding process will vary depending on the yarn speed just before slowing down the package.

[0005] The purpose of this invention is to maintain a constant amount of yarn wound into the package at the end of the winding process, even when the yarn speed is changed during the winding process.

[0006] means for solving problems

[0007] The following sections will explain several methods as means to solve the problem. These methods can be combined arbitrarily as needed.

[0008] One aspect of the yarn winding apparatus of the present invention includes a yarn supply section, a winding section, and a control section. The yarn supply section supplies yarn. The winding section winds the yarn to form a package. The control section controls the winding section. The control section performs deceleration and stop control on the winding section. The deceleration and stop control reduces the yarn's travel speed (i.e., the yarn speed) from the yarn speed during the package formation process, and controls the yarn speed to become 0 when the length of the yarn wound on the package reaches a predetermined package winding completion length. In this case, the start timing of the deceleration and stop control is determined based on the package winding completion length, the yarn speed during package formation, and the length of the yarn wound on the package.

[0009] In a yarn winding device that ends the winding of yarn into a package by deceleration and stop control as described above, the timing of starting the deceleration and stop control takes into account not only the length of the yarn wound into the package, but also the yarn speed during the formation of the package, i.e. the yarn speed just before the deceleration and stop control is about to start. Therefore, even if the yarn speed is different during the formation of the package, the amount of yarn wound into the package at the end of the winding can be kept approximately constant at the length of the package winding.

[0010] In the aforementioned yarn winding device, the deceleration rate of the yarn during deceleration stop control can also be preset. Therefore, since the time it takes for the yarn speed to decrease from its initial speed just before the deceleration stop control begins is known, the start timing of the deceleration stop control can be accurately determined.

[0011] In the yarn winding device described above, the deceleration rate of the yarn in the deceleration stop control can also be changed. This allows for more flexible setting of the package formation conditions.

[0012] In the yarn winding apparatus described above, the winding section may also include a rotary drive section that rotates the package. In this case, the control section can measure the length of the yarn wound on the package based on the drive amount of the rotary drive section. Therefore, a sensor capable of directly measuring the length of the wound yarn is not required.

[0013] In the aforementioned yarn winding apparatus, the winding section may also include a braking device that reduces the rotational speed of the package. In this case, the control section may also perform deceleration stop control by combining the deceleration of the package based on the braking device and the deceleration of the rotary drive section. This suppresses slippage between the package and the rotary drive section and stops the rotation of the package within a short time.

[0014] Furthermore, when using both a deceleration mechanism based on a braking device and a rotary drive for deceleration, the package contacts the rotary drive at the end of the deceleration stop control, resulting in a yarn connection. That is, at the end of the deceleration stop control, there is no lifting action to separate the package from the rotary drive; however, by determining the start timing of the deceleration stop control as described above, even without lifting, the amount of yarn wound onto the package at the end of the winding process can be kept approximately constant at the completed winding length of the package.

[0015] The yarn winding device described above may also include a storage roller. The storage roller is positioned between the yarn supply section and the winding section in the yarn travel direction, winding and temporarily storing the yarn. In this case, the control unit can also measure the length of the yarn wound on the package based on the rotational speed of the storage roller. Therefore, regardless of the shape of the package, the length of the yarn wound on the package can be accurately measured.

[0016] The yarn winding device described above may also include a yarn quantity detection sensor. The yarn quantity detection sensor detects when the amount of yarn stored on the storage roller reaches a predetermined quantity. In this case, the control unit can also measure the length of the yarn wound on the package based on the rotational speed of the storage roller after the yarn quantity detection sensor detects that the amount of yarn stored on the storage roller has reached the predetermined quantity. At the start (restart) of package formation, the amount of yarn stored on the storage roller is unclear (deviation exists), therefore, the yarn length measured based on the rotational speed of the storage roller from the start of formation is inaccurate. Therefore, as described above, by measuring the yarn length based on the rotational speed of the storage roller after the amount of yarn stored on the storage roller has reached the predetermined quantity, the yarn length can be measured more accurately.

[0017] In the yarn winding device described above, the control unit may set the winding speed of the yarn onto the package to be lower than the accumulation speed of the yarn onto the accumulation roller at the beginning of package formation. This shortens the time from the start of package formation to the accumulation of a predetermined amount of yarn onto the accumulation roller, thus allowing for earlier timing of the measurement of yarn length based on the rotational speed of the accumulation roller.

[0018] In the aforementioned yarn winding device, the control unit may calculate the length of the yarn wound on the package from the start to the end of the deceleration stop control, i.e., the deceleration stop yarn length, based on the yarn speed during the package formation process. The moment when the length of the yarn wound on the package becomes the deceleration start yarn length is determined as the start timing of the deceleration stop control. This deceleration start yarn length is obtained by subtracting the deceleration stop yarn length from the package winding completion length. Therefore, the start timing of the deceleration stop control can be accurately determined based on the package winding completion length, the yarn speed during the package formation process, and the length of the yarn wound on the package.

[0019] In the aforementioned yarn winding device, the length of the deceleration stop yarn can also vary linearly with respect to the yarn speed during the package formation process. Therefore, the length of the deceleration stop yarn can be calculated easily.

[0020] Invention Effects

[0021] According to the present invention, even if the yarn speed is different during the formation of the package, the amount of yarn wound into the package at the end of the winding can be kept approximately constant at the end length of the package winding. Attached Figure Description

[0022] Figure 1 This is a diagram showing the structure of an automatic winding machine.

[0023] Figure 2 This is a diagram showing the structure of a winding unit.

[0024] Figure 3This is a diagram showing the structure of the roll forming section.

[0025] Figure 4 This is an enlarged view of the accumulation roller.

[0026] Figure 5 It is a diagram showing the control structure of the control device.

[0027] Figure 6 This is a flowchart illustrating the formation process of a package using a winding unit.

[0028] Figure 7 This is a graph illustrating how the winding length of yarn changes over time at different yarn speeds.

[0029] Figure 8 This is a diagram illustrating the time variation of yarn speed after multiple stages of deceleration, assuming the formation of the package is completed. Detailed Implementation

[0030] 1. First Implementation Method

[0031] (1) Automatic winding machine

[0032] The first embodiment will now be described in detail. Furthermore, in the description of the accompanying drawings, the same or equivalent elements will be labeled with the same reference numerals, and repeated descriptions will be omitted. "Upstream" and "downstream" refer to the upstream and downstream directions of the yarn's travel, respectively.

[0033] use Figure 1 The automatic winding machine 1 is described below. Figure 1 This diagram shows the structure of an automatic winding machine 1. The automatic winding machine 1 includes multiple winding units 2 arranged in an array, a machine control device 3, a yarn supply bobbin supply device 4, and a doffing device 5. Additionally, a blower box is provided in the automatic winding machine 1.

[0034] The winding unit 2 winds the yarn Y onto the winding bobbin 22 to form a package 30. The winding unit 2 unwinds the yarn Y from the yarn supply bobbin 21 and temporarily stores the unwound yarn Y in the yarn storage device 40. Then, the yarn Y stored in the yarn storage device 40 is pulled out and wound onto the winding bobbin 22 to form a package 30.

[0035] The machine control device 3 is configured to communicate with each winding unit 2. The operator of the automatic winding machine 1 can centrally manage multiple winding machine units 2 by appropriately operating the machine control device 3. The machine control device 3 controls the operation of the yarn feeding bobbin supply device 4 and the doffing device 5.

[0036] The yarn feeding bobbin supply device 4 places the yarn feeding bobbins 21 one by one on the conveyor tray 26. The yarn feeding bobbin supply device 4 supplies the yarn feeding bobbins 21 placed on the conveyor tray 26 to multiple winding units 2 respectively.

[0037] When the winding unit 2 has a full roll of yarn 30 (with a specified amount of yarn Y wound on it), the doffing device 5 moves to the position of the winding unit 2 and removes the full roll of yarn 30. The doffing device 5 then provides the winding unit 2 with a winding bobbin 22 containing the unwound yarn Y.

[0038] (2) Winding unit

[0039] (2-1) Simplified structure of the winding unit

[0040] The structure of winding unit 2 will be explained below. First, using... Figure 2 This section describes the general structure of winding unit 2. Figure 2 This diagram shows the structure of the winding unit 2. The winding unit 2 includes a yarn supply section 6, a yarn storage device 40, a yarn guide section 7, a package forming section 8, and a control device 25.

[0041] The yarn supply unit 6 is configured to support the yarn supply bobbin 21, which is disposed on the conveyor tray 26, at a predetermined position, and unwind the yarn Y from the yarn supply bobbin 21. If the yarn supply unit 6 unwinds all the yarn Y from the yarn supply bobbin 21, it discharges the core tube of the yarn supply bobbin 21 that is not wound with yarn Y, and receives a new yarn supply bobbin 21 from the yarn supply bobbin supply device 4.

[0042] The yarn storage device 40 is positioned midway along the yarn travel path between the yarn supply section 6 and the package forming section 8. The yarn storage device 40 is located upstream of the waxing device 70 in the yarn Y's travel direction. The yarn storage device 40 winds up the yarn Y unwound from the yarn supply section 6 and temporarily stores it. The yarn storage device 40 supplies the stored yarn Y to the package forming section 8.

[0043] A yarn guide 7 is disposed between the yarn supply section 6 and the yarn storage device 40, guiding the yarn Y supplied from the yarn supply section 6 between the yarn supply section 6 and the yarn storage device 40. In the yarn guide 7, when the yarn Y breaks between the yarn supply section 6 and the yarn storage device 40, the end portion of the yarn Y present on the yarn supply section 6 side is spliced ​​with the end portion of the yarn Y present on the yarn storage device 40 side.

[0044] The package forming section 8 winds the yarn Y supplied from the yarn storage device 40 onto the winding bobbin 22 to form a package 30.

[0045] The control device 25 is a computer system equipped with hardware such as a CPU and other information processing circuits, storage devices (ROM, RAM, etc.), and various interfaces. The storage devices contain software such as control programs. The control device 25 controls the various structures of the winding unit 2 through the cooperation of hardware and software. The control device 25 is configured to communicate with the machine control device 3. Therefore, the operation of the multiple winding units 2 of the automatic winding machine 1 can be centrally managed in the machine control device 3.

[0046] The winding unit 2 may also be equipped with a waxing device 70. The waxing device 70 is disposed between the yarn storage device 40 and the package forming section 8. The waxing device 70 waxes the yarn Y that travels from the yarn storage device 40 toward the package forming section 8.

[0047] (2-2) Roll forming section

[0048] The following uses Figure 3 The roll forming section 8 will be described. Figure 3 This is a diagram showing the structure of the package forming section 8. The package forming section 8 has a cradle 23 and a traverse roller 24. The cradle 23 supports the winding bobbin 22 (or package 30) so that it can rotate. The cradle 23 is configured to allow the outer peripheral surface of the supported package 30 to contact or separate from the outer peripheral surface of the traverse roller 24.

[0049] The cradle 23 has a pair of cradle arms 23a and 23b. The cradle arms 23a and 23b are supported so that they can rotate about axis A1 and in a direction toward or away from the transverse roller 24.

[0050] At the front ends of the rocker arms 23a and 23b are bobbin supports 23c and 23d for holding the winding bobbin 22 in a rotatable position. The bobbin supports 23c and 23d respectively have support bodies 23e and 23f that engage with the ends of the winding bobbin 22 in the direction of the rotation axis. The support bodies 23e and 23f engage with both ends of the winding bobbin 22 and rotate integrally with the winding bobbin 22.

[0051] A braking device 60 is built into the bobbin support 23c. The braking device 60 has a brake shoe that is close to or away from the support body 23e. The brake shoe can be moved by the pressure of the air supplied by the variable air pressure unit 60a. Specifically, if the air pressure of the variable air pressure unit 60a is increased, the brake shoe contacts the support body 23e and acts as a brake on the rotation of the wound bobbin 22 (winding 30). The deceleration of the rotational speed of the wound bobbin 22 (winding 30) can be adjusted by the air pressure of the variable air pressure unit 60a.

[0052] In addition, a winding speed sensor 61 is arranged near the bobbin support 23d to detect the winding speed of the winding 30 and output it to the control device 25.

[0053] The traverse roller 24 is driven to rotate by the roller drive motor 62. With the roll 30 in contact with the traverse roller 24, the traverse roller 24 rotates, thereby causing the bobbin 22 and the roll 30 to rotate consequently. The roller drive motor 62 is, for example, a DC brushless motor, a stepper motor, a servo motor, or any other motor capable of position control.

[0054] A roller speed sensor 63 is disposed near the traversing roller 24. The roller speed sensor 63 detects the rotational speed of the traversing roller 24 and outputs it to the control device 25. Alternatively, the rotational speed of the traversing roller 24 can also be measured by a sensor (e.g., an encoder) that measures the rotational speed of the roller drive motor 62.

[0055] A transverse groove 24a is formed on the outer peripheral surface of the transverse roller 24. The transverse roller 24 rotates while passing the yarn Y through the transverse groove 24a, thereby causing the yarn Y to move back and forth (transversely) at a predetermined width. With the above structure, the yarn Y can be wound onto the winding bobbin 22 while transversely moving, thereby forming a package 30 of a predetermined shape.

[0056] (2-3) Yarn storage device

[0057] use Figure 2 as well as Figure 4 The detailed structure of the yarn storage device 40 is described below. Figure 4 This is an enlarged view of the accumulation roller 41. The yarn accumulation device 40 includes an accumulation roller 41 capable of winding yarn Y and a drive motor 45 for rotating and driving the accumulation roller 41.

[0058] The accumulation roller 41 has a drum shape and temporarily stores the yarn Y by winding it around the accumulation area A on the outer peripheral surface 41d of the accumulation roller 41. The accumulation roller 41 is supported on the body (frame) of the automatic winding machine 1 in a manner that allows it to rotate about a rotation axis C1 that is slightly inclined relative to the horizontal direction. Figure 2 and Figure 4 As shown, tapered portions 41a and 41b, which increase in diameter as they approach the ends, are formed on both axial ends of the accumulation roller 41. The portion between the two tapered portions 41a and 41b forms a cylindrical portion 41c with a constant diameter, and its outer peripheral surface 41d is the accumulation area A of the wound yarn Y. The outer peripheral surface 41d of the cylindrical portion 41c is mirror-finished. The two tapered portions 41a and 41b on both ends prevent the yarn Y wound on the cylindrical portion 41c from falling off.

[0059] A ring member 42 is wound around the outer peripheral surface 41d of the cylindrical portion 41c of the accumulation roller 41. The ring member 42 is formed into a ring shape, for example, from rubber. The ring member 42 is installed at the boundary between the cylindrical portion 41c and the tapered portion 41b on the front end side. The ring member 42 is a tension ring that surrounds and contacts the yarn Y pulled out from the accumulation roller 41 by the package forming portion 8, applying resistance to the yarn Y. The ring member 42 is installed in the cylindrical portion 41c by an elastic force that tightens it radially inward. The ring member 42 applies resistance to the yarn Y pulled out from the accumulation roller 41 by this elastic force. By applying appropriate tension to the yarn Y pulled out from the accumulation roller 41 by the ring member 42, the unwinding of the yarn Y from the accumulation roller 41 is stabilized.

[0060] On the outer peripheral surface 41d of the accumulation roller 41, a first recess 43a is provided in the region spanning the mounting position of the ring member 42 in the direction along the rotation axis C1. That is, viewed from the radially outer side of the accumulation roller 41, the first recess 43a is provided and intersects the mounting position of the ring member 42, and a portion of the first recess 43a overlaps with the mounting position. Here, the first recess 43a constitutes a groove extending from one end of the accumulation roller 41 to the other end in the direction along the rotation axis C1. The first recess 43a has, for example, the same cross-sectional shape in its length direction, and is formed as a generally rectangular cross-section. A second recess 43b is also provided on the outer peripheral surface 41d of the accumulation roller 41. The second recess 43b is a recess (so-called downgage) provided in such a way that when a boss or reinforcing rib for embedding a sensor magnet is formed on the inner peripheral surface 41g of the cylindrical portion 41c, no sink mark (so-called sink mark) is formed.

[0061] The drive motor 45 rotates the accumulation roller 41 in the direction of winding the yarn Y from the yarn supply section 6. Alternatively, the drive motor 45 can also rotate the accumulation roller 41 in the opposite direction of winding. The drive motor 45 is, for example, a DC brushless motor, a stepper motor, a servo motor, or any other motor capable of position control.

[0062] The yarn storage device 40 has a storage roller speed sensor 46. Figure 5 The rotational speed sensor 46 measures the rotational speed of the accumulation roller 41. This sensor 46 is connected, for example, to the output rotational shaft of the drive motor 45, and the rotational speed of the accumulation roller 41 is determined based on the rotational speed of the output rotational shaft. The accumulation roller rotational speed sensor 46 is, for example, an encoder.

[0063] The yarn Y wound on the storage roller 41 is pulled out from the tapered portion 41b at the other end of the storage roller 41 (the upstream side of the storage roller 41) and conveyed downstream (towards the package forming portion 8). At the tapered portion 41b, the yarn Y on the storage roller 41 is pulled downstream via a pull-out guide 37 located on the extension line of the rotation axis C1 of the storage roller 41. The yarn Y wound on the storage roller 41 is unwound between itself and the aforementioned loop member 42, thereby applying appropriate tension to the unwound yarn Y.

[0064] A yarn quantity detection sensor 50 is disposed near the outer peripheral surface 41d of the cylindrical portion 41c of the accumulation roller 41. The yarn quantity detection sensor 50 detects when the amount of yarn Y accumulated in the accumulation roller 41 reaches a predetermined amount. Furthermore, the yarn quantity detection sensor 50 can also use an upper limit to a lower limit of the accumulated amount as its detection range. The yarn quantity detection sensor 50 can, for example, consist of a light source 53 and a sensor 55. The light source 53 illuminates the accumulation roller 41, and the sensor 55 is configured such that light reflected from the outer peripheral surface 41d is not incident, but light reflected from the yarn Y accumulated in the accumulation roller 41 is incident. In this case, the yarn quantity detection sensor 50 can detect that the amount of yarn Y accumulated has reached the predetermined amount by the reflection of light from the light source 53 onto the yarn Y and the detection by the sensor 55.

[0065] The light source 53 can be, for example, an LED (Light Emitting Diode). Additionally, the sensor 55 can be, for example, a photodiode. Furthermore, the sensor 55 can also be a CCD image sensor or a CMOS image sensor, i.e., a linear sensor, that obtains light through a row of photodiodes arranged in a line.

[0066] (2-4) Yarn guiding section

[0067] use Figure 2 The detailed structure of the yarn guide 7, which guides the yarn Y between the yarn supply section 6 and the yarn storage device 40, will be described. The yarn guide 7 is disposed in the yarn path (yarn travel path) of the yarn Y and includes an unwinding assist device 7a, a yarn unwinding detector 7b, a tension application section 7c, a capturing device 7d, a splicing device 7e, a yarn monitoring device 7f, a yarn ejection section 7g, and a yarn guiding component 7h.

[0068] The unwinding assist device 7a causes the movable part 71 to oscillate and contact the air ring formed on the upper part of the yarn supply tube 21 as the yarn Y is unwound from the yarn supply tube 21, and assists in the unwinding of the yarn Y by appropriately controlling the size of the air ring.

[0069] The yarn detection detector 7b is positioned downstream of the unwinding aid 7a, close to the unwinding aid 7a. The yarn detection detector 7b indicates whether there is yarn Y supplied from the unwinding aid 7a.

[0070] The tension applying unit 7c applies a predetermined tension to the traveling yarn Y. Based on the tension of the yarn Y detected by a tension sensor, the tension applying unit 7c applies a predetermined tension to the yarn Y. The tension applying unit 7c is configured as a gate-type structure with movable comb teeth arranged relative to fixed comb teeth, applying a predetermined resistance by causing the yarn Y to travel between the comb teeth. The movable comb teeth are configured to be movable via, for example, a solenoid, so that the comb teeth are in an engaged or unengaged state. Furthermore, the structure of the tension applying unit 7c is not particularly limited; for example, it can also be a disc-type tension applying unit.

[0071] The capturing device 7d is disposed downstream of the tension applying part 7c. The capturing device 7d has a first capturing part 72 and a second capturing part 73. In this embodiment, the first capturing part 72 and the second capturing part 73 are integrated into one component. The first capturing part 72 and the second capturing part 73 are respectively connected to a negative pressure source.

[0072] The first capturing part 72 is configured as a cylindrical component with an opening at its front end. When the first capturing part 72 is joined, it generates an airflow that draws in the internal space of the yarn guiding component 7h, thereby drawing in and capturing the yarn Y on the side of the yarn storage device 40.

[0073] The second capturing part 73 is configured as a cylindrical component with an opening at its front end. The second capturing part 73 is configured to be oscillating. The second capturing part 73 is positioned to capture the yarn Y supplied from the unwinding assist device 7a side. Figure 2 The position shown by the solid line), and the guide position that guides the yarn Y-direction splicing device 7e ( Figure 2 It swings between the positions shown by the dashed line. The capture position can also be the standby position of the second capture unit 73.

[0074] When the second capturing unit 73 is in the capturing position, near the yarn channel downstream of the yarn detector 7b, it generates an attractive airflow at its front end, thereby attracting and capturing the yarn end from the yarn supply bobbin 21. When the yarn Y is cut by the cutter 74, the second capturing unit 73 attracts and captures the yarn end of the cut yarn Y on the yarn supply bobbin 21 side. Alternatively, the second capturing unit 73 can also be configured to attract and remove fly waste or other debris adhering to the traveling yarn Y by generating an attractive airflow at its front end.

[0075] An auxiliary blowing unit 75 is provided. When the yarn Y is captured by the second capturing unit 73, the auxiliary blowing unit 75 blows the yarn end to the downstream side of the yarn detector 7b (the front end of the second capturing unit 73) immediately after a new yarn supply bobbin 21 has been supplied to the yarn supply unit 6.

[0076] The auxiliary blowing unit 75 sprays compressed air into the hollow conveying tray 26 and the interior of the yarn supply bobbin 21, thereby creating an airflow at the front end of the yarn supply bobbin 21 that blows the yarn Y of the yarn supply bobbin 21 toward the lower yarn detector 7b. When a newly supplied yarn supply bobbin 21 is supported by the yarn supply unit 6, the auxiliary blowing unit 75 operates, thereby reliably conveying the yarn end on the side of the yarn supply bobbin 21 toward the lower yarn detector 7b.

[0077] The splicing device 7e splices disconnected yarn Y. When the yarn Y is disconnected between the yarn supply bobbin 21 and the yarn storage device 40, such as when the yarn monitoring device 7f detects a yarn defect and cuts the yarn Y using the cutter 74, when the yarn Y breaks off while unwinding from the yarn supply bobbin 21, or when the yarn supply bobbin 21 is replaced, the splicing device 7e splices the end of the yarn Y on the yarn supply bobbin 21 side with the end of the yarn Y on the yarn storage device 40 side. The splicing device 7e is positioned slightly recessed from the yarn path. The splicing device 7e can connect the introduced yarn ends to each other, making the yarn Y continuous. The splicing device 7e can be a device utilizing fluids such as compressed air, or a mechanical device.

[0078] The yarn monitoring device 7f detects yarn defects such as thick yarns and foreign matter intrusion by monitoring the thickness of yarn Y using appropriate sensors. A cutter 74 is positioned upstream of the yarn monitoring device 7f, close to it. The cutter 74 immediately cuts the yarn Y upon detection of a yarn defect by the yarn monitoring device 7f. The cutter 74 and the yarn monitoring device 7f are housed in a shared housing 76. The housing 76 housing the yarn monitoring device 7f is located downstream of the splicing device 7e.

[0079] The yarn ejector 7g is located near the tapered portion 41a on one end side (upstream side of the accumulation roller 41) of the accumulation roller 41, and is composed of a thin cylindrical member that allows yarn Y to pass through. Compressed air is ejected from the opening of the yarn ejector 7g on the side near the yarn supply section 6 in the direction from the yarn storage device 40 toward the yarn supply section 6. When the yarn Y is disconnected between the yarn supply bobbin 21 and the yarn storage device 40, the yarn ejector 7g draws the yarn end of the yarn Y on the yarn storage device 40 side into the interior and captures it by ejecting air in the direction from the yarn storage device 40 toward the yarn supply section 6, and blows it away into the guide path of the yarn guide member 7h.

[0080] On the other hand, during normal yarn winding, the yarn ejector 7g guides the yarn Y supplied from the yarn supply section 6 towards the tapered portion 41a at one end of the accumulation roller 41. When the drive motor 45 is driven to rotate the accumulation roller 41 in one direction, the yarn Y guided by the yarn ejector 7g to the tapered portion 41a at one end of the accumulation roller 41 is wound sequentially along the yarn layer before being pushed up from one end (upstream side) of the cylindrical portion 41c. As a result, the yarn Y already wound on the outer peripheral surface 41d of the accumulation roller 41 is pushed by the newly wound yarn Y and conveyed sequentially to the other end (downstream side). Thus, on the outer peripheral surface of the cylindrical portion 41c of the accumulation roller 41, the yarn Y is arranged in a spiral shape and wound regularly from one end to the other end.

[0081] The yarn ejection section 7g can be moved by the moving section 77 to the optimal position (called the yarn guiding position) for guiding the yarn Y that crosses from the yarn supply section 6 to the accumulation roller 41, and to the optimal position (called the yarn pulling position) for pulling out the yarn end of the yarn Y stored in the yarn accumulation device 40 by attraction and guiding it to the splicing device 7e (the guide path of the yarn guiding member 7h).

[0082] The yarn guide member 7h is a curved cylindrical component with openings at both ends along its length. One opening of the yarn guide member 7h is positioned near the yarn supply section 6 of the yarn ejector section 7g. The other opening is positioned opposite the first capturing section 72. A guide path is formed inside the yarn guide member 7h. The guide path connects the openings at both ends of the yarn guide member 7h to each other, bypassing the yarn monitoring device 7f and the splicing device 7e, etc. A slit extending through to the guide path is formed along the entire length of the yarn guide member 7h.

[0083] When the yarn Y is disconnected between the yarn supply bobbin 21 and the yarn storage device 40, the yarn guiding member 7h guides the yarn Y blown by the yarn ejector 7g along the guiding path to the first capturing part 72, so that the first capturing part 72 captures the guided yarn Y. Since a slit extending through the guiding path is formed along the entire length of the yarn guiding member 7h, the yarn guiding member 7h can pull the yarn Y captured by the first capturing part 72 out of the guiding path of the yarn guiding member 7h and guide it toward the splicing device 7e.

[0084] (2-5) Control device

[0085] The following uses Figure 5 The structure of the control device 25 will be described. In particular, the control structure related to the rotation control of the package 30 and the control of the yarn storage device 40 in the control device 25 will be described. Figure 5This is a diagram showing the control structure of the control device 25. The control device 25 includes an information processing unit 25a and a storage unit 25b.

[0086] The information processing unit 25a consists of information processing circuits such as the CPU of the control device 25, and performs various information processing related to the winding unit 2. The information processing unit 25a performs various information processing by executing programs stored in the storage unit 25b. The storage unit 25b consists of the storage device of the control device 25, and stores various programs, various parameters related to the control of the winding unit 2, etc.

[0087] The storage unit 25b stores at least deceleration information IN1, winding completion length information IN2, and deceleration stop yarn length information IN3. Deceleration information IN1 is used to set the deceleration rate of yarn Y in the deceleration stop control. The deceleration stop control is as follows: when the package 30 becomes fully wound and the winding of yarn Y stops, the travel speed of yarn Y in the yarn travel path, i.e., the yarn speed, decelerates from the yarn speed during the formation of the package 30 at a constant deceleration (i.e., the deceleration rate set by the deceleration information IN1), until the length of yarn Y wound on the package 30 reaches the winding completion length (referred to as the package winding completion length). Furthermore, in the deceleration stop control, the yarn speed when the length of yarn Y wound on the package 30 reaches the package winding completion length can also be slightly increased or decreased from 0 (error).

[0088] The deceleration of yarn Y, set by the deceleration information IN1, i.e., the deceleration of yarn Y in the deceleration stop control, can be changed according to the formation conditions of package 30, etc. This allows for more flexible setting of the formation conditions of package 30.

[0089] The winding completion length information IN2 is used to set the winding completion length of the aforementioned package. The winding completion length of the package can be determined as the winding completion length information IN2 when setting the formation conditions of the package 30.

[0090] The deceleration stop yarn length information IN3 is used to determine the yarn length (referred to as the deceleration stop yarn length) of the yarn Y wound on the package 30 from the start to the end of the aforementioned deceleration stop control. The inventors experimentally investigated the relationship between the yarn speed before the deceleration stop control was about to begin and the deceleration stop yarn length by changing the yarn speed before the deceleration stop control was about to begin, and found that the deceleration stop yarn length changes linearly with respect to the yarn speed before the deceleration stop control was about to begin. That is, it was found that when the yarn speed before the deceleration stop control was about to begin is set to x, and the deceleration stop yarn length is set to y, it is expressed as y = a * xb (a, b: positive constants). The deceleration stop yarn length information IN3 stores this formula or the constants a and b contained in this formula.

[0091] As described above, the deceleration stop yarn length information IN3 can be obtained experimentally, for example, by obtaining data representing the relationship between the yarn speed before the deceleration stop control is about to begin and the deceleration stop yarn length, and the obtained data can be used for calculation.

[0092] Furthermore, for example, the above formula can be theoretically calculated based on the yarn speed at the time of forming the package 30 (i.e., the yarn speed before the deceleration stop control is about to begin) and the deceleration set in the deceleration information IN1, to determine the deceleration stop yarn length information IN3. Specifically, if the yarn speed at the time of forming the package 30 is set to V, the deceleration is set to Ac, and the time taken from the yarn speed being decelerated from V to 0 at the deceleration Ac is set to t, then the yarn length from the start to the end of the deceleration stop control is expressed as (Ac*t). 2 ) / 2. The above t can be expressed as V / Ac, therefore the yarn length from the start to the end of the deceleration stop control can ultimately be expressed as V using the yarn speed and deceleration at the time the package 30 is formed. 2 / (2*Ac).

[0093] Furthermore, although not described in detail, the aforementioned reduction speed can vary depending on the type of yarn being wound in a 30-wind package. The reduction speed can be preset, taking into account factors such as yarn thickness, specific gravity, and weight per unit length, and can be appropriately set according to the type of yarn being wound.

[0094] The information processing unit 25a of the control device 25 feeds back the rotational speed of the traverse roller 24 measured by the roller speed sensor 63, and controls the rotational speed of the roller drive motor 62 so that the fed-back rotational speed becomes the target rotational speed, thereby enabling accurate control of the rotational speed of the traverse roller 24.

[0095] In addition, the information processing unit 25a feeds back the rotational speed of the accumulation roller 41 based on the rotational speed of the accumulation roller 41 measured by the accumulation roller speed sensor 46, and controls the rotational speed of the drive motor 45 so that the feedback rotational speed becomes the target rotational speed, thereby enabling accurate control of the rotational speed of the accumulation roller 41.

[0096] When the roll 30 is decelerated, the information processing unit 25a feeds back the rotational speed of the roll 30 based on the rotational speed measured by the roll rotational speed sensor 61, and controls the air pressure of the air pressure variable unit 60a so that the feedback rotational speed becomes the target rotational speed, thereby enabling the roll 30 to be decelerated with high precision.

[0097] In the winding unit 2 with the above-described structure, the yarn Y is wound around the traverse roller 24 by rotating the traverse roller 24, and then supplied from the traverse roller 24 to the package 30 while traversing traversely. Therefore, the rotational speed of the traverse roller 24 corresponds to the length of the yarn Y wound on the package 30. Therefore, the information processing unit 25a can measure the length of the yarn Y wound on the package 30 based on the rotational speed of the traverse roller 24 measured by the roller speed sensor 63.

[0098] Furthermore, the amount of yarn Y supplied to the traverse roller 24 corresponds to the amount of yarn Y supplied from the accumulation roller 41 to the traverse roller 24 after being wound on the accumulation roller 41 of the yarn accumulation device 40. Therefore, the amount of yarn Y wound on the accumulation roller 41 due to the rotation of the accumulation roller 41 also corresponds to the length of the yarn Y wound on the package 30. Therefore, the information processing unit 25a can measure the length of the yarn Y wound on the package 30 based on the rotational speed of the accumulation roller 41 measured by the accumulation roller speed sensor 46.

[0099] In this embodiment, the information processing unit 25a combines the measurement of the yarn Y length using the roller speed sensor 63 and the measurement of the yarn Y length using the accumulation roller speed sensor 46 to measure the length of the yarn Y wound on the package 30.

[0100] Specifically, when the formation of package 30 begins, or when the formation of package 30 is stopped and restarted due to yarn breakage, yarn cutting, bobbin replacement, etc., the length of yarn Y wound on package 30 is measured using roller speed sensor 63. In addition, the length of yarn Y wound on package 30 is measured using accumulation roller speed sensor 46. Specifically, when the yarn quantity detection sensor 50 detects that the accumulation amount of yarn Y on accumulation roller 41 has reached a predetermined amount, the information processing unit 25a switches from measuring the length of yarn Y using roller speed sensor 63 to measuring the length of yarn Y using accumulation roller speed sensor 46.

[0101] At the start / restart of package 30, especially during restart operations such as removing yarn Y, the amount of yarn Y accumulated on the accumulation roller 41 is unknown. Therefore, at the start / restart of package 30, the length of yarn Y cannot be accurately measured using the accumulation roller speed sensor 46. Therefore, by measuring the length of yarn Y at the start / restart of package 30, the length of yarn Y wound on package 30 can be accurately measured.

[0102] On the other hand, during the formation of the package 30, especially when the package 30 is conical (frustum-shaped), the length of the yarn Y cannot be accurately measured using the roller speed sensor 63. On the other hand, since the accumulation roller 41 has a roller shape (cylindrical shape), if the accumulation roller 41 has accumulated a predetermined amount of yarn Y, the length of the yarn Y wound on the package 30 can be accurately measured based on the rotational speed of the accumulation roller 41, regardless of the shape of the package 30.

[0103] Therefore, after the yarn quantity sensor 50 detects that the yarn quantity Y in the accumulation roller 41 has reached the specified quantity, the length of the yarn Y wound on the package 30 is measured based on the rotational speed of the accumulation roller 41, thereby enabling accurate measurement of the length of the yarn Y wound on the package 30 regardless of the shape of the package 30.

[0104] Furthermore, the information processing unit 25a is able to calculate the yarn speed of yarn Y as the length of yarn Y wound on package 30 per specified unit time.

[0105] (3) Roll forming action

[0106] The following uses Figure 6 The forming operation of the package 30 using the winding unit 2 will be explained. Figure 6 This is a flowchart illustrating the forming action of the package 30 using the winding unit 2. Figure 6 This is a flowchart illustrating the process of forming a package 30. First, the forming conditions for the package 30 are set (step S1). For example, the forming conditions for the package 30 can be set using the input device of the machine control device 3 or the input device of the control device 25. Specifically, for example, the yarn length of the yarn Y wound on the package 30 (i.e., the package winding completion length (winding completion length information IN2)), the yarn speed of the yarn Y during the forming process of the package 30, and the deceleration in the deceleration stop control (i.e., deceleration information IN1), etc. The deceleration in the deceleration stop control can be set to the maximum deceleration. The information processing unit 25a of the control device 25 stores the set forming conditions in the storage unit 25b.

[0107] Then, the information processing unit 25a calculates the length of the yarn Y wound on the package 30 at the start of deceleration stop control (referred to as the deceleration start yarn length) (step S2). Specifically, the deceleration start yarn length is calculated as follows.

[0108] First, the information processing unit 25a refers to the deceleration stop yarn length information IN3 to understand the relationship between the deceleration stop yarn length and the yarn speed during the formation of the package 30, and uses this relationship to calculate the deceleration start yarn length. For example, if the information processing unit 25a understands the formula y = a * xb (x: yarn speed during the formation of the package 30, y: deceleration stop yarn length, a, b: positive constants) based on the deceleration stop yarn length information IN3, the information processing unit 25a can substitute the yarn speed during the formation of the package 30 set in step S1 (the yarn speed before the start of deceleration stop control) into x in the formula to calculate the deceleration stop yarn length.

[0109] Furthermore, when the deceleration stop yarn length calculated using the above formula is 0 or less (0 or a negative value), the deceleration stop yarn length is set to 0. That is, the start timing of the deceleration stop control is set to the timing when the length of the yarn Y wound on the package 30 becomes the completed winding length of the package. This occurs when the yarn speed during the formation of the package 30 becomes b / a or less, which is calculated by solving the equation where y = 0 in the above formula with respect to x.

[0110] When the yarn speed is low during the formation of package 30, even if deceleration and stop control are performed at the time when the length of yarn Y wound on package 30 reaches the completed winding length of package 30, the length of yarn Y wound on package 30 is still relatively short at the time of execution of deceleration and stop control. Therefore, even if deceleration and stop control are performed at the time when the length of yarn Y wound on package 30 reaches the completed winding length of package 30, it can still be considered that the length of yarn Y wound on package 30 is within the error range of the completed winding length of package 30.

[0111] For example, based on the yarn length information IN3 at the deceleration stop, y = x is known. 2 In the case of the formula / (2*Ac)(x: yarn speed during the formation of package 30, y: length of yarn to stop deceleration, Ac: deceleration), the information processing unit 25a substitutes the yarn speed during the formation of package 30 set in step S1 into x in the formula, and substitutes the deceleration set in the deceleration information IN1 into Ac, and can calculate the length of yarn to stop deceleration.

[0112] Next, the information processing unit 25a can calculate the deceleration start yarn length by subtracting the deceleration stop yarn length calculated as described above from the package winding completion length set in the winding completion length information IN2. That is, it can calculate (deceleration start yarn length) = (package winding end length) - (deceleration stop yarn length).

[0113] After calculating the starting yarn length for deceleration, the formation of package 30 begins (step S3). The information processing unit 25a controls the drive motor 45 to rotate the storage roller 41, winding and storing the yarn Y supplied from the yarn supply unit 6 and passing through the yarn guide unit 7 onto the storage roller 41. Additionally, the information processing unit 25a controls the roller drive motor 62 to rotate the traverse roller 24, thereby rotating the winding bobbin 22 (package 30). Thus, the yarn Y is wound onto the winding bobbin 22 (package 30) to form package 30.

[0114] At the start of the formation of package 30, the information processing unit 25a causes the winding speed of yarn Y towards package 30 based on the rotation of the traverse roller 24 to be lower than the accumulation speed of yarn towards accumulation roller 41 based on the rotation of accumulation roller 41. As a result, the accumulation of yarn Y towards accumulation roller 41 takes precedence over the supply of yarn Y from accumulation roller 41 to traverse roller 24, and thus the accumulation amount of yarn Y towards accumulation roller 41 reaches a predetermined accumulation amount in a short time, which is then detected by yarn quantity detection sensor 50. Consequently, the method for measuring the length of yarn Y wound on package 30 switches from the measurement method using roller speed sensor 63 to the measurement method using accumulation roller speed sensor 46 in a short time.

[0115] That is, the time from the formation of the package 30 to the accumulation of a predetermined amount of yarn Y in the accumulation roller 41 can be shortened, thus enabling the timing of the measurement of the yarn Y length based on the rotational speed of the accumulation roller 41 to be advanced.

[0116] During the formation of package 30, as described above, the information processing unit 25a uses the roller speed sensor 63 or the storage roller speed sensor 46 to measure the length of the yarn Y wound on package 30 (step S4).

[0117] When measuring the length of the yarn Y wound on the package 30, the information processing unit 25a determines whether the measured length of the yarn Y is the same as the deceleration start yarn length calculated in step S2 above (step S5). If the measured length of the yarn Y is smaller than the deceleration start yarn length ("No" in step S5), the formation of the package 30 continues while measuring the length of the yarn Y wound on the package 30.

[0118] On the other hand, if the measured length of yarn Y is the starting yarn length for deceleration ("Yes" in step S5), the information processing unit 25a begins deceleration stop control (step S6). Specifically, the information processing unit 25a decelerates the yarn speed of yarn Y to 0 from the yarn speed during the formation of package 30 at the deceleration rate set in the deceleration information IN1 (e.g., the maximum deceleration rate), thereby stopping the rotation of package 30 and ending the formation of package 30.

[0119] During the execution of the aforementioned deceleration and stop control, the information processing unit 25a also uses the braking device 60 to decelerate the roll 30 and the traverse roller 24. Specifically, the deceleration using these two methods is performed as follows.

[0120] The information processing unit 25a first controls the air pressure variable unit 60a of the braking device 60 to begin decelerating the roll 30 at a set deceleration. Then, the information processing unit 25a controls the roller drive motor 62 to begin decelerating the traverse roller 24. That is, the information processing unit 25a first decelerates the roll 30, and then decelerates the traverse roller 24. This results in a state where the circumferential speed of the roll 30 is slower than the circumferential speed of the traverse roller 24.

[0121] At this time, the information processing unit 25a controls the air pressure variable unit 60a of the braking device 60 to adjust the deceleration of the roll 30 so that the difference between the circumferential speed of the roll 30 and the circumferential speed of the traverse roller 24, i.e., the amount of slippage between the roll 30 and the traverse roller 24, is within a specified range. It also controls the rotation of the roller drive motor 62 to control the deceleration of the traverse roller 24. The allowable range of slippage is preferably set to 50–1000 m / min, and more preferably to 200–400 m / min.

[0122] In this way, by using both the deceleration of the roll 30 based on the braking device 60 and the deceleration of the traverse roller 24 to slow down the roll 30, slippage between the roll 30 and the traverse roller 24 can be suppressed, and the rotation of the roll 30 can be stopped in a short time. That is, for example, even if the roll 30 is stopped in a short time with maximum deceleration, no damage will be caused to the roll 30.

[0123] Furthermore, by using both the deceleration of the winding 30 by the braking device 60 and the deceleration of the traverse roller 24 to lift the winding 30 away from the traverse roller 24, the winding 30 can be stopped without cutting the yarn Y. That is, in the winding unit 2 of this embodiment, the winding 30 stops while the winding 30 is in contact with the traverse roller 24 and the yarn Y between the winding 30 and the yarn storage device 40 is connected (not cut).

[0124] In the winding unit 2 described above, which terminates the winding of yarn Y into package 30 via deceleration stop control, the start timing of the deceleration stop control is determined not only by considering the length of yarn Y wound on package 30, but also by considering the yarn speed during the formation of package 30, i.e., the yarn speed just before the deceleration stop control is about to begin. Specifically, based on the yarn speed during the formation of package 30, the yarn length of yarn Y wound on package 30 from the start to the end of the deceleration stop control, i.e., the deceleration stop yarn length, is calculated. The moment when the length of yarn Y wound on package 30 becomes the deceleration start yarn length obtained by subtracting the deceleration stop yarn length from the completed package winding length is taken as the start timing of the deceleration stop control.

[0125] Therefore, even if the yarn speed varies during the formation of package 30, the amount of yarn wound onto package 30 at the end of the winding process can remain approximately constant along the completed winding length of the package. For example, as Figure 7 As shown, when the yarn speed of yarn Y is V1, the yarn length at the start of deceleration is calculated to be L1. At time t1, when the length of yarn Y wound on package 30 becomes the yarn length at the start of deceleration L1, deceleration and stop control begin. At time tf1, when the yarn speed becomes 0, the formation of package 30 ends, and the winding length of yarn Y becomes the winding completion length LF of package. Figure 7 This is a graph illustrating an example of how the winding length of yarn Y changes over time at different yarn speeds.

[0126] On the other hand, when the yarn speed of yarn Y is V2, which is less than V1, the yarn length at the start of deceleration is calculated to be L2, which is greater than L1. The time t2 when the length of yarn Y wound on package 30 becomes the yarn length L2 at the start of deceleration is later than time t1. By starting deceleration and stopping control at this time t2, the yarn speed becomes 0 at time tf2, and the formation of package 30 ends. The winding length of yarn Y at the end of the formation of package 30 becomes the same winding end length LF as at yarn speed V1.

[0127] 2. Other implementation methods

[0128] The present invention has been described above as an 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 variations described in this specification can be arbitrarily combined as needed.

[0129] (A) indicates the forming action of the package 30 using winding unit 2. Figure 6 The processing content and execution order of each step in the flowchart can be arbitrarily changed without departing from the spirit of the invention.

[0130] (B) In the above embodiment, the formation of the package 30 ends when the yarn speed is reduced to 0 during the process of forming the package 30. However, it is not limited to this; the formation of the package 30 may end after more than one deceleration stage, where the yarn speed is reduced to 0. Specifically, for example, as... Figure 8 As shown, the formation of roll 30 can also be completed after three stages of deceleration. Figure 8 This is a diagram illustrating an example of the time-varying yarn speed when the formation of package 30 is completed after multiple stages of deceleration.

[0131] More specifically, the yarn speed during the formation of package 30 is set to V3. At time t3, the speed is reduced to a constant V4 to continue forming package 30. Then, at time t4, the speed is further reduced to a constant V5 to continue forming package 30. Afterward, at time t5, the speed reduction control is stopped, reducing the yarn speed from V5 to 0, thus ending the formation of package 30. In this case, the yarn length at the start of deceleration is calculated as the winding length of yarn Y at time t5.

[0132] By ending the formation of package 30 after multiple deceleration stages as described above, compared to the case where the yarn speed suddenly becomes 0 during the formation of package 30, the yarn speed before the deceleration and stop control is about to begin can be reduced. Therefore, the length of the yarn Y wound on package 30 at the end of the formation of package 30 can be made close to the length of the package winding completion.

[0133] (C) When the sensor 55 of the yarn quantity detection sensor 50 is set as a linear sensor, even if the yarn Y is removed due to yarn breakage or the like, the amount of yarn Y stored in the storage roller 41 can be determined. Therefore, the length of the yarn Y wound on the package 30 can be measured based solely on the rotational speed of the storage roller 41.

[0134] (D) In ​​the first embodiment described above, the yarn supply unit 6 supplies yarn Y unwound from the yarn supply bobbin 21. That is, the winding unit 2 in the first embodiment is an automatic winding machine. However, it is not limited to this; other forms of the yarn supply unit 6 may also be used. The yarn supply unit 6 may also be configured to supply, for example, yarn Y spun by airflow. That is, the winding unit 2 may also be an airflow spinning machine.

[0135] (E) Alternatively, the yarn supply unit 6 can be configured to supply yarn Y spun by the rotational force of the rotor. That is, the winding unit 2 can also be a free-end spinning machine.

[0136] 3. Features of the implementation method

[0137] The above-described embodiments can also be described as follows.

[0138] (1) A yarn winding device (e.g., winding unit 2) includes a yarn supply section (e.g., yarn supply section 6), a winding section (e.g., package forming section 8), and a control section (e.g., control device 25). The yarn supply section supplies yarn (e.g., yarn Y). The winding section winds the yarn to form a package (e.g., package 30). The control section controls the winding section. The control section performs deceleration and stop control on the winding section. The deceleration and stop control is a control that reduces the yarn travel speed, i.e., the yarn speed, from the yarn speed during the package forming process, and makes the yarn speed 0 when the length of the yarn wound on the package reaches a predetermined package winding completion length. In this case, the start timing of the deceleration and stop control is determined based on the package winding completion length, the yarn speed during the package forming process, and the length of the yarn wound on the package.

[0139] In a yarn winding device that ends the winding of yarn into a package by deceleration and stop control as described above, the timing of starting the deceleration and stop control takes into account not only the length of the yarn wound into the package, but also the yarn speed during the formation of the package, i.e. the yarn speed just before the deceleration and stop control is about to start. Therefore, even if the yarn speed is different during the formation of the package, the amount of yarn wound into the package at the end of the winding can be kept approximately constant at the length of the package winding.

[0140] (2) In the yarn winding device described in (1) above, the deceleration rate of the yarn in the deceleration stop control can also be preset. Therefore, since the time it takes for the yarn speed to change from the speed just before the deceleration stop control is about to start is known, the start timing of the deceleration stop control can be accurately determined.

[0141] (3) In the yarn winding device described in (1) or (2) above, the deceleration rate of the yarn in the deceleration stop control can also be changed. As a result, the formation conditions of the package can be set more flexibly.

[0142] (4) In any of the yarn winding devices described in (1) to (3) above, the winding section may also have a rotary drive section (e.g., a traverse roller 24) that rotates the package. In this case, the control section may also measure the length of the yarn wound on the package based on the driving amount of the rotary drive section (e.g., the rotational speed of the traverse roller 24). Thus, it is not necessary to have a sensor that can directly measure the length of the wound yarn.

[0143] (5) In the yarn winding apparatus described in (4) above, the winding section may also include a braking device (e.g., braking device 60) to reduce the rotational speed of the package. In this case, the control section may also perform deceleration stop control by combining the deceleration of the package based on the braking device and the deceleration of the rotary drive section. As a result, slippage between the package and the rotary drive section can be suppressed, and the rotation of the package can be stopped in a short time.

[0144] Furthermore, when using both a deceleration mechanism based on a braking device and a rotary drive for deceleration, the package contacts the rotary drive at the end of the deceleration stop control, resulting in a yarn connection. That is, at the end of the deceleration stop control, there is no lifting action to separate the package from the rotary drive; however, by determining the start timing of the deceleration stop control as described above, even without lifting, the amount of yarn wound onto the package at the end of the winding process can be kept approximately constant at the completed winding length of the package.

[0145] (6) The yarn winding device of any one of (1) to (5) above may also include a storage roller (e.g., storage roller 41). The storage roller is disposed between the yarn supply section and the winding section in the yarn travel direction, and winds and temporarily stores the yarn. In this case, the control unit may also measure the length of the yarn wound on the package based on the rotational speed of the storage roller. Thus, the length of the yarn wound on the package can be accurately measured regardless of the shape of the package.

[0146] (7) The yarn winding device described in (6) above may also include a yarn quantity detection sensor (e.g., yarn quantity detection sensor 50). The yarn quantity detection sensor detects when the amount of yarn stored on the storage roller reaches a predetermined amount. In this case, the control unit can also measure the length of the yarn wound on the package based on the rotational speed of the storage roller after the yarn quantity detection sensor detects that the amount of yarn stored on the storage roller has reached the predetermined amount. At the beginning of package formation (restart), the amount of yarn stored on the storage roller is unclear (deviation), so the length of the yarn measured based on the rotational speed of the storage roller from the beginning of formation is inaccurate. Therefore, as described above, by measuring the length of the yarn based on the rotational speed of the storage roller after the amount of yarn stored on the storage roller has reached the predetermined amount, the length of the yarn can be measured more accurately.

[0147] (8) In the yarn winding device described in (7) above, the control unit may set the winding speed of the yarn into the package to be lower than the accumulation speed of the yarn into the accumulation roller at the beginning of package formation. As a result, the time from the beginning of package formation to the accumulation of a predetermined amount of yarn into the accumulation roller can be shortened, and the timing for starting the measurement of yarn length based on the rotational speed of the accumulation roller can be advanced.

[0148] (9) In any of the yarn winding devices described in (1) to (8) above, the control unit may calculate the length of the yarn wound on the package from the start to the end of the deceleration stop control, i.e., the deceleration stop yarn length, based on the yarn speed during the package formation process. The time when the length of the yarn wound on the package becomes the deceleration start yarn length obtained by subtracting the deceleration stop yarn length from the package winding completion length is determined as the start timing of the deceleration stop control. Thus, the start timing of the deceleration stop control can be accurately determined based on the package winding completion length, the yarn speed during the package formation process, and the length of the yarn wound on the package.

[0149] (10) In the yarn winding device described in (9) above, the length of the deceleration stop yarn can also vary linearly with respect to the yarn speed during the formation of the package. Therefore, the length of the deceleration stop yarn can be calculated easily.

[0150] Industrial applicability

[0151] This invention can be widely applied to yarn winding devices.

Claims

1. A yarn winding device, comprising: The yarn supply department supplies yarn. The winding section winds the aforementioned yarn to form a package; and The control unit controls the aforementioned winding unit. The control unit performs deceleration and stop control on the winding unit. This deceleration and stop control reduces the yarn speed from the yarn speed during the formation of the package and makes the yarn speed zero when the length of the yarn wound on the package reaches a preset package winding completion length. The start timing of the deceleration and stop control is determined based on the package winding completion length, the yarn speed during the formation of the package, and the length of the yarn wound on the package.

2. The yarn winding device according to claim 1, characterized in that, The deceleration rate of the yarn in the aforementioned deceleration and stop control is preset.

3. The yarn winding device according to claim 1 or 2, characterized in that, The deceleration rate of the yarn in the aforementioned deceleration and stop control can be changed.

4. The yarn winding device according to any one of claims 1 to 3, characterized in that, The winding section described above has a rotary drive section that rotates the package. The control unit measures the length of the yarn wound on the package based on the driving amount of the rotary drive unit.

5. The yarn winding device according to claim 4, characterized in that, The aforementioned winding section also includes a braking device for reducing the rotational speed of the aforementioned roll. The aforementioned control unit performs the deceleration and stop control by combining the deceleration of the winding caused by the aforementioned braking device and the deceleration of the aforementioned rotary drive unit. When the aforementioned deceleration and stop control ends, the aforementioned roll contacts the aforementioned rotary drive unit, resulting in the aforementioned yarn connection state.

6. The yarn winding device according to any one of claims 1 to 5, characterized in that, The yarn winding device described above also includes a storage roller, which is disposed between the yarn supply section and the winding section in the yarn travel direction to wind and temporarily store the yarn. The control unit measures the length of the yarn wound on the package based on the rotational speed of the accumulation roller.

7. The yarn winding device according to claim 6, characterized in that, The aforementioned yarn winding device also includes a yarn quantity detection sensor, which detects when the amount of yarn accumulated on the aforementioned accumulation roller reaches a predetermined amount. The control unit measures the length of the yarn wound on the package based on the rotational speed of the accumulation roller after the yarn accumulation amount detected by the yarn quantity detection sensor reaches a predetermined accumulation amount.

8. The yarn winding device according to claim 7, characterized in that, At the start of the formation of the package, the control unit makes the winding speed of the yarn toward the package lower than the accumulation speed of the yarn toward the accumulation roller.

9. The yarn winding apparatus according to any one of claims 1 to 8, characterized in that, The control unit calculates the yarn length wound onto the package from the start to the end of the deceleration stop control, i.e., the deceleration stop yarn length, based on the yarn speed during the formation of the package. The moment when the length of the yarn wound onto the package becomes the starting yarn length for deceleration is determined as the starting timing for the deceleration stop control. This starting yarn length for deceleration is obtained by subtracting the deceleration stop yarn length from the length of the package after winding.

10. The yarn winding device according to claim 9, characterized in that, The length of the deceleration stop yarn varies linearly with respect to the yarn speed during the formation of the package.

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