WO2020075383A1

WO2020075383A1 - Yarn winding device and yarn winding method

Info

Publication number: WO2020075383A1
Application number: PCT/JP2019/031771
Authority: WO
Inventors: 志郎播戸
Original assignee: Ｔｍｔマシナリー株式会社
Priority date: 2018-10-09
Filing date: 2019-08-09
Publication date: 2020-04-16
Also published as: EP3865443A4; JP7410047B2; JPWO2020075383A1; TWI766185B; CN112739636A; TW202014369A; EP3865443A1; JP2022159556A

Abstract

The present invention suppresses fluctuations in winding ratio and prevents the surface shape of a package from being disturbed, even if creeping is performed during the execution of precision winding. The yarn winding machine comprises a guide driving unit that reciprocatingly drives a traverse guide and that can change the reversal position of the traverse guide during a yarn winding operation, and a control device. The control device can perform: a first reversing control wherein the traverse guide, which is traveling outward at a predetermined speed in the traversal direction, is decelerated, then reversed so as to travel inward at a first reversal position, and then re-accelerated to a predetermined speed; and a second reversing control wherein, the traverse guide, which is traveling outward at a predetermined speed in the traversal direction, is decelerated, then reversed so as to travel inward at a second reversal position further inward than the first reversal position, and then re-accelerated to a predetermined speed. The control device makes second reverse time (Trb) in the second reversing control longer than first reverse time (Tra) in the first reversing control during the execution of the precision winding.

Description

Yarn winding machine and yarn winding method

The present invention relates to a yarn winding machine and a yarn winding method.

Patent Document 1 discloses a yarn winding machine that winds a yarn around a bobbin while traversing the yarn with a traverse guide to form a package. The yarn winding machine includes a bobbin driving motor that rotationally drives the bobbin, a guide driving mechanism that causes the traverse guide to travel back and forth by the guide driving motor, and a control unit that controls the bobbin driving motor and the guide driving motor. One of the winding methods of the yarn in such a yarn winding machine is a "precision winding" method in which the ratio (wind ratio) between the number of revolutions of the bobbin and the number of traverses per unit time is controlled to be constant. In precision winding, the wind ratio is generally set to a value that is slightly different from an integer so that ribbon winding does not occur (no repeated winding of the yarn on the same path on the package surface). By doing so, in the precision winding, the ribbon winding can be avoided, and the yarn can be regularly wound in parallel while shifting the winding route of the yarn on the package surface little by little. Thereby, the unwinding property of the yarn from the formed package can be improved, and the package density can be easily controlled according to the application of the package.

Separately from this, Patent Document 2 discloses a traverse device capable of performing creeping for suppressing the height of the ear of the package. Ear height is because it is generally difficult to rapidly reverse (direction change) the traverse guide, and the amount of yarn wound around the axial end of the package surface is greater than the amount of yarn wound around other parts. It will be many. The ear height may cause deterioration of the package shape and / or non-uniformity of the package density. Creeping refers to temporarily narrowing the width of the reciprocating region of the traverse guide (traverse width) during package formation. As a result, as compared with the case where creeping is not performed, the amount of yarn wound around the axial end portion of the package is reduced, and the ear height is reduced.

Japanese Patent Laid-Open No. 3-115060 JP-A-57-13058

In the yarn winding machine described in Patent Document 1, the following problems may occur when trying to perform creeping during precision winding (more details will be described in an embodiment described later). First, for example, if the traverse width during creeping is simply made narrower than during normal traverse (hereinafter referred to as normal time), the traverse cycle changes and the wind ratio cannot be kept constant. For this reason, the position where the yarn is actually wound on the package surface is displaced from the position where the yarn is originally intended to be wound, and the shape of the package surface is disturbed. Therefore, in order to prevent this, it is necessary to perform creeping without changing the traverse cycle. However, for example, if the wind ratio is made constant by simply changing the moving speed of the traverse guide between the normal time and the creeping time, the angle formed by the yarn and the package surface (twist angle) will be changed. There is a shift between normal and creeping. Therefore, the shape of the package surface is also disturbed.

The object of the present invention is to suppress the fluctuation of the wind ratio and the disturbance of the shape of the package surface even if creeping is performed during the execution of precision winding.

The yarn winding machine of the first invention is capable of winding a running yarn on a rotating bobbin while traversing the traveling traverse guide, and the number of revolutions of the bobbin and the number of reciprocating movements of the traverse guide per unit time. Is a yarn winding machine configured to form a package while performing a precision winding for maintaining a constant wind ratio, which is a yarn winding operation for reciprocally driving the traverse guide in a predetermined traverse direction. A guide driving unit capable of changing the reverse position of the traverse guide and a control unit are provided therein, and the control unit controls the guide driving unit to move outward at a predetermined speed in the traverse direction. A first reversal control for decelerating the traveling traverse guide to invert at a predetermined first reversal position, and reaccelerating to the predetermined speed; The idling drive unit is controlled to decelerate the traverse guide traveling outward at the predetermined speed in the traverse direction to invert at a second reversal position inside the first reversal position. The second reversal control for reaccelerating to the predetermined speed can be executed, and during the execution of the precision winding, the time from the deceleration start of the traverse guide to the reacceleration completion in the first reversal control can be performed. The second reversal time, which is the time from the start of deceleration of the traverse guide to the completion of reacceleration in the second reversal control, is made longer than a certain first reversal time.

As a premise for normally performing precision winding while performing creeping, the traverse guide is reversed at the first reverse position (hereinafter also referred to as normal time) and at the second reverse position (hereinafter, during creeping). Also called), it is necessary to make the wind ratio equal. In order to equalize the wind ratio, for example, when the bobbin rotation speed is constant, the traverse guide movement period is set to be equal to the normal time even during creeping when the width of the traverse guide movement area is narrower than in the normal time. There is a need.

In the present invention, the second inversion time is longer than the first inversion time. Thus, by positively prolonging the reversal time during creeping, it is possible to prolong the movement cycle of the traverse guide during creeping. This makes it possible to equalize the movement cycle of the traverse guide between the normal time and the creeping time. Therefore, it is possible to prevent the fluctuation of the wind ratio.

Further, since the traverse cycle at the time of creeping can be adjusted by adjusting the second reversal time in this manner, the traveling speed of the traverse guide can be made equal between the normal time and the creeping at timings other than the reversal timing. it can. Therefore, the angles of the yarn wound around the package surface can be made uniform. Therefore, it is possible to prevent the shape of the package surface from being disturbed.

As described above, even if creeping is performed during the execution of precision winding, it is possible to suppress the fluctuation of the wind ratio and prevent the shape of the package surface from being disturbed.

In the yarn winding machine of the second invention, in the first invention, in the second inversion control, the control unit has a longer distance between the first inversion position and the second inversion position in the traverse direction. The width of the region in which the traverse guide moves in the traverse direction is widened within the second inversion time.

In order to suppress the disturbance of the shape of the package surface while suppressing the fluctuation of the wind ratio, the longer the distance between the first reversal position and the second reversal position (that is, the narrower the traverse width during creeping) is, 2 It is necessary to lengthen the reversal time. Here, when the width of the region in which the traverse guide moves in the traverse direction within the second reversal time (hereinafter referred to as the reversal region) is constant, if the second reversal time becomes long, the traverse guide causes the second reversal control. Occasionally, it will remain in the area near the second reversal position for a long time. Then, the yarn is likely to be intensively wound around the narrow area on the surface of the package. As a result, the surface of the package is likely to have a step, and the yarn may fall off, which may adversely affect the shape of the package.

In the present invention, the longer the distance between the first reversal position and the second reversal position, the wider the reversal region. That is, when the second reversal time becomes long due to the narrowing of the traverse width during creeping, the region where the traverse guide can move during the second reversal control becomes wider. Therefore, it is possible to prevent the traverse guide from being continuously positioned for a long time within a narrow area in the traverse direction. Therefore, it is possible to prevent the yarn from being intensively wound in a narrow area on the surface of the package.

In the yarn winding machine according to a third aspect of the present invention, in the first or second aspect of the invention, in the second reversal control, the control unit starts deceleration of the traverse guide for half the second reversal time. The guide drive unit is controlled so that the traverse guide is positioned at the second reversal position in the traverse direction when time passes.

In the second reversal control, for example, the traverse guide can be rapidly decelerated to reach the second reversal position, and then gradually re-accelerated. However, in this case, the shape of the inverted portion of the yarn wound around the package surface may be significantly different between when the traverse guide is decelerated and when it is re-accelerated. For this reason, the shape of the reverse portion of the yarn on the package surface becomes asymmetric, and the reverse portion may not be formed cleanly. In the present invention, the time from the start of deceleration of the traverse guide until the traverse guide reaches the second inversion position is equal to the time from the departure of the traverse guide from the second inversion position to the completion of reacceleration. can do. As a result, the shape of the inverted portion of the yarn can be made symmetrical with respect to the center axis of the package (that is, the inverted portion can be formed neatly). Therefore, it is possible to suppress the disorder of the shape of the inverted portion of the package surface.

The yarn winding machine of a fourth invention is the yarn winding machine of any one of the first to third inventions, further comprising a bobbin drive unit that rotationally drives the bobbin, and the control unit controls the rotation angle of the bobbin and the traverse guide. A storage unit that stores information about a relationship with a position in the traverse direction, and controls the bobbin drive unit and the guide drive unit based on the information stored in the storage unit. Is.

In the present invention, by performing control based on information regarding the relationship between the rotation angle of the bobbin and the position of the traverse guide, while maintaining a constant wind ratio, as compared with the case of performing control using a complicated mechanical structure, for example. The complicated operation of creeping can be facilitated. Further, by rewriting the information, it is possible to easily adjust the position and / or speed of the traverse guide during the second inversion control.

The yarn winding machine of the fifth invention is characterized in that, in any one of the first to fourth inventions, the guide drive unit has a drive source configured to be capable of forward and reverse drive.

For example, in a general cam type traverse device, a motor that rotates in one direction is used as a drive source, and the structure for performing creeping is a complicated mechanical structure. For this reason, it is difficult for the cam type traverse device to perform fine control of creeping. In the present invention, the traverse guide can be made to travel back and forth by the forward and reverse drive of the drive source. Therefore, the position and timing of reversal of the traverse guide can be finely controlled by the control unit. Therefore, fine control of creeping can be easily performed.

A yarn winding machine according to a sixth aspect of the present invention is characterized in that, in the fifth aspect, the guide drive unit includes a belt member to which the traverse guide is attached and which is reciprocally driven by the drive source. .

For example, in a configuration in which a traverse guide is attached to the tip of a swingable arm and the arm is driven to swing, the traverse guide travels back and forth in an arc. Therefore, even if precision winding is performed, it may be difficult to regularly wind the yarn around the package surface. In the present invention, the portion of the belt member to which the traverse guide is attached is stretched linearly and is reciprocally driven, so that the traverse guide can be easily linearly reciprocated. Therefore, it is possible to easily and regularly wind the yarn around the package surface.

In the yarn winding method of the seventh invention, the running yarn is wound around a rotating bobbin while being traversed by a traverse guide, and the ratio of the number of revolutions of the bobbin to the number of reciprocating movements of the traverse guide per unit time is calculated. A yarn winding method for forming a package while performing precision winding for maintaining a certain wind ratio constant, by decelerating the traverse guide running outward at a predetermined speed in a predetermined traverse direction A first reversing step of reversing inward at the first reversing position and re-accelerating to the predetermined speed, and decelerating the traverse guide traveling outward at the predetermined speed in the traverse direction, A second reversing step of reversing inward at a second reversing position inside the first reversing position and re-accelerating to the predetermined speed. During the execution of the precision winding, from the deceleration start of the traverse guide in the second reversing step to the first reversal time which is the time from the deceleration start of the traverse guide to the re-acceleration completion in the first reversing step. The second reversal time, which is the time until the completion of reacceleration, is lengthened.

Like the first invention, in the present invention, even if creeping is performed during the execution of precision winding, it is possible to suppress the fluctuation of the wind ratio and to prevent the shape of the package surface from being disturbed.

It is the schematic diagram which looked at the rewinder which concerns on this embodiment from the front. It is a figure which shows the electric constitution of a rewinder. (A) is a graph showing the relationship between the position of the traverse guide and time, and (b) is a graph showing the relationship between the speed of the traverse guide and time. (A) And (b) is explanatory drawing of precision winding, (c) is explanatory drawing of creeping. (A) is a graph which shows the relationship between the speed of a traverse guide and time, (b) is explanatory drawing which shows the path | route of the thread | yarn on the surface of a winding package. (A) is a graph which shows the relationship between the speed of a traverse guide and time, (b) is explanatory drawing which shows the path | route of the thread | yarn on the surface of a winding package. (A) is a graph showing the relationship between the position of the traverse guide and time, and (b) is a graph showing the relationship between the speed of the traverse guide and time. (A) is a graph showing the relationship between the acceleration of the traverse guide and time, and (b) is a graph showing the relationship between the width of the reversal region and the creeping amount. (A) And (b) is explanatory drawing which shows the path | route of the thread | yarn on the package surface. (A) is a graph which shows the relationship between the position of a traverse guide and time which concerns on a modification, and (b) is a graph which similarly shows the relationship between the speed of a traverse guide and time. 11 is a graph showing a relationship between acceleration of the traverse guide and time according to the modified example shown in FIG. 10.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 9. The vertical direction and the horizontal direction shown in FIG. 1 are the vertical direction and the horizontal direction of the rewinder 1, respectively. The direction orthogonal to both the up-down direction and the left-right direction (the direction perpendicular to the paper surface of FIG. 1) is the front-back direction. The traveling direction of the yarn Y is referred to as a yarn traveling direction.

(Rewinder configuration)
First, the configuration of the rewinder 1 (yarn winding machine of the present invention) according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic view of the rewinder 1 viewed from the front. As shown in FIG. 1, the rewinder 1 includes a yarn supplying unit 11, a winding unit 12, a control device 13 (control unit of the present invention), and the like. The rewinder 1 unwinds the yarn Y from the yarn supplying package Ps supported by the yarn supplying unit 11, rewinds the yarn Y onto the winding bobbin Bw (bobbin of the present invention) by the winding unit 12, and the winding package Pw (book). The invention package). More specifically, the rewinder 1 is, for example, for rewinding the yarn Y wound around the yarn supplying package Ps more neatly, or forming a winding package Pw having a desired density.

The yarn feeder 11 is attached to the front surface of the lower part of the machine stand 14 that is erected, for example. The yarn supplying unit 11 is configured to support a yarn supplying package Ps formed by winding a yarn Y on a yarn supplying bobbin Bs. Thereby, the yarn supplying section 11 can supply the yarn Y.

The winding unit 12 is for winding the yarn Y on the winding bobbin Bw to form a winding package Pw. The winding unit 12 is provided on the upper portion of the machine base 14. The winding unit 12 includes a cradle arm 21, a winding motor 22 (bobbin driving unit of the present invention), a traverse device 23, a contact roller 24, and the like.

The cradle arm 21 is swingably supported by the machine base 14, for example. The cradle arm 21 rotatably supports the take-up bobbin Bw with the left-right direction as the axial direction of the take-up bobbin Bw. A bobbin holder (not shown) that holds the take-up bobbin Bw is rotatably attached to the tip of the cradle arm 21. The winding motor 22 is for rotating and driving the bobbin holder. The winding motor 22 is, for example, a general AC motor, and is configured to be able to change the rotation speed. Accordingly, the winding motor 22 can change the rotation speed of the winding bobbin Bw. The winding motor 22 is electrically connected to the control device 13 (see FIG. 2).

The traverse device 23 is a device for traversing the yarn Y in the axial direction of the winding bobbin Bw (in the present embodiment, the left-right direction). The traverse device 23 is arranged immediately upstream of the winding package Pw in the yarn traveling direction. The traverse device 23 includes a traverse motor 31 (guide drive unit of the present invention), an endless belt 32 (belt member of the present invention), and a traverse guide 33.

The traverse motor 31 is, for example, a general AC motor. The traverse motor 31 is a drive source that is configured to be capable of normal rotation driving and reverse rotation driving and that is capable of changing the number of rotations. The traverse motor 31 is electrically connected to the control device 13 (see FIG. 2). The endless belt 32 is a belt member to which the traverse guide 33 is attached. The endless belt 32 is wound around a pulley 34 and a pulley 35 that are spaced apart from each other in the left-right direction and a drive pulley 36 that is connected to the rotation shaft of the traverse motor 31, and is stretched in a substantially triangular shape. There is. The endless belt 32 is reciprocally driven by the traverse motor 31. The traverse guide 33 is attached to the endless belt 32, and is arranged between the

pulleys

34 and 35 in the left-right direction. The traverse guide 33 is linearly reciprocated in the left-right direction when the endless belt 32 is reciprocally driven by the traverse motor 31 (see the arrow in FIG. 1). As a result, the traverse guide 33 traverses the yarn Y in the left-right direction. Below, the left-right direction is also referred to as the traverse direction. In the traverse device 23 having the above-described configuration, the width of the moving region of the traverse guide 33 (traverse width) during the winding operation of the yarn Y is controlled by controlling the switching timing of the rotation direction of the rotation shaft of the traverse motor 31. ) Can be changed.

The contact roller 24 is for applying a contact pressure to the surface of the winding package Pw to adjust the shape of the winding package Pw. The contact roller 24 contacts the winding package Pw and rotates following the rotation of the winding package Pw.

A yarn guide 15, a guide roller 16, and a tension sensor 17 are arranged in this order from the upstream side between the yarn supplying section 11 and the winding section 12 in the yarn traveling direction. The yarn guide 15 is arranged, for example, on an extension line of the central axis of the yarn supplying bobbin Bs, and guides the yarn Y unwound from the yarn supplying package Ps to the downstream side in the yarn traveling direction. The guide roller 16 is for guiding the yarn Y guided by the yarn guide 15 further downstream in the yarn traveling direction. The guide roller 16 is arranged on the front surface of the machine base 14 and above the thread guide 15. The guide roller 16 is rotationally driven by, for example, a roller drive motor 18. The roller drive motor 18 is, for example, a general AC motor, and is configured to be able to change the rotation speed. Thereby, the roller drive motor 18 can change the rotation speed of the guide roller 16. The roller drive motor 18 is electrically connected to the control device 13 (see FIG. 2). In the present embodiment, tension is applied to the yarn Y by the speed difference between the peripheral speed of the guide roller 16 and the peripheral speed of the winding package Pw.

The tension sensor 17 is arranged between the winding package Pw and the guide roller 16 in the yarn traveling direction, and detects the tension applied to the yarn Y. The tension sensor 17 is electrically connected to the control device 13 (see FIG. 2) and sends the tension detection result to the control device 13.

The control device 13 includes a CPU, a ROM, a RAM (storage unit 19), and the like. The storage unit 19 stores parameters such as the winding amount and winding speed of the yarn Y and the strength of the tension applied to the yarn Y. The control device 13 controls each unit by the CPU according to the program stored in the ROM based on the parameters stored in the RAM (storage unit 19).

In the rewinder 1 as described above, the yarn Y unwound from the yarn supply package Ps runs downstream in the yarn running direction. The traveling yarn Y is wound around the rotating winding bobbin Bw while being traversed in the left-right direction (traverse direction) by the traverse guide 33 (a yarn winding operation).

(Movement control of traverse guide)
Next, basic movement control of the traverse guide 33 by the control device 13 will be described with reference to FIG. FIG. 3A is a graph showing the relationship between the position of the traverse guide 33 in the traverse direction and time. FIG. 3B is a graph showing the relationship between speed and time in the traverse direction of the traverse guide 33.

Information related to the traverse width is stored in the storage unit 19 (see FIG. 2) of the control device 13. The control device 13 controls the traverse motor 31 based on the information stored in the storage unit 19. As a result, the endless belt 32 is reciprocally driven, and the traverse guide 33 travels back and forth in the traverse direction.

In the graph shown in FIG. 3A, the horizontal axis represents time, and the vertical axis represents the position of the traverse guide 33 in the traverse direction. For convenience of explanation, the left side of the center of the region (traverse region) where the traverse guide 33 reciprocates in the left-right direction is the positive direction of the vertical axis of the graph. The right side of the center of the traverse area is the negative direction of the vertical axis of the graph.

As an example, when the traverse width is W, as shown in FIG. 3 (a), the traverse guide 33 travels back and forth within the region of −W / 2 to W / 2 in the traverse direction. More specifically, for example, at a predetermined time (the left end of the graph in FIG. 3A), the traverse guide 33 is located at the right end (position of −W / 2). After a lapse of a predetermined time (denoted by T), the traverse guide 33 moves to the left end (W / 2 position). After that, the traverse guide 33 is reversed rightward and reaches the right end again. By repeating this, the traverse guide 33 travels back and forth.

In the graph shown in FIG. 3 (b), the horizontal axis represents time and the vertical axis represents the speed of the traverse guide 33 in the traverse direction. Hereinafter, a specific example will be described. When the traverse guide 33 is located at the right end (position of -W / 2), the speed of the traverse guide 33 is zero. The controller 13 controls the traverse motor 31 to accelerate the traverse guide 33 to a predetermined speed (V). After that, the control device 13 maintains the speed of the traverse guide 33 constant until the traverse guide 33 reaches the vicinity of the left end (position of W / 2). When the traverse guide 33 reaches the vicinity of the left end, the controller 13 controls the traverse motor 31 to perform the following reversal control. That is, the control device 13 decelerates the traverse guide 33 traveling leftward (outward in the traverse direction) and reverses it rightward (inward in the traverse direction) at the position W / 2. After that, the control device 13 re-accelerates the traverse guide 33 to a predetermined speed (see -V in FIG. 3B). In the present embodiment, the time from the deceleration start of the traverse guide 33 to the re-acceleration completion in the reversal control is called the reversal time (Tr shown in FIGS. 3A and 3B).

(Precision winding and creeping)
Next, precision winding and creeping will be described with reference to FIGS. FIGS. 4A and 4B are explanatory diagrams of precision winding, and are diagrams in which the winding package Pw is developed in the rotation angle direction. For convenience of explanation, as shown in FIGS. 4A and 4B, the rotation angle at the upper end of the paper surface of the winding package Pw is 0 degrees, and the rotation angle at the lower end of the paper surface is 360 degrees. FIG. 4C is an explanatory diagram of creeping.

First, I will explain the precision volume. Precision winding is a winding method that maintains a constant ratio (wind ratio) between the number of revolutions of the winding bobbin Bw and the number of reciprocating movements of the traverse guide 33 per unit time. As a result, the relationship between the rotation angle of the winding bobbin Bw and the position of the traverse guide 33 in the traverse direction can be controlled regardless of the winding diameter of the winding package Pw.

The storage unit 19 (see FIG. 2) of the control device 13 stores, for example, information (table and calculation formula) regarding the relationship between the rotation angle of the winding bobbin Bw and the position of the traverse guide 33 in the traverse direction. As a specific example, the storage unit 19 stores the rotation angle of the winding bobbin Bw, and the acceleration / deceleration start position and the reversal position of the traverse guide 33 in the traverse direction in association with each other. Further, the storage unit 19 stores a calculation formula for calculating the speed and / or the acceleration of the traverse guide 33 based on the information about the rotation angle of the winding bobbin Bw and the information about the position of the traverse guide 33. There is. The control device 13 controls the winding motor 22 and the traverse motor 31 based on the information stored in the storage unit 19. In the present embodiment, the control device 13 controls the winding motor 22 so as to maintain the rotation speed of the winding bobbin Bw constant. As a first example, as shown in FIG. 4A, when the wind ratio is 5, the take-up bobbin Bw makes 5 revolutions each time the traverse guide 33 makes one reciprocation. That is, as shown in FIG. 4A, each time the traverse guide 33 makes one reciprocation, the yarn Y is wound up by the amount of 5 rotations of the winding package Pw.

Note that when the winding ratio is an integer as described above, there is a problem that the yarn Y is repeatedly wound on the same path on the surface of the winding package Pw (so-called ribbon winding occurs). To avoid this, the wind ratio is actually set to a value (for example, 5 + α) slightly different from an integer, as shown in FIG. 4B. By doing so, in the precision winding, while avoiding the ribbon winding, the winding Y of the yarn Y on the surface of the winding package Pw can be regularly wound in parallel while being slightly shifted. As a result, it is possible to improve the unwinding property of the yarn Y from the winding package Pw in the subsequent step and to easily control the package density according to the application of the winding package Pw.

Next, I will explain about creeping. Creeping is to temporarily change the traverse width during the winding operation of the yarn Y for the purpose of suppressing the height of the winding package Pw. The ear height means that the amount of yarn wound around the axial end portion of the surface of the winding package Pw is larger than the amount of yarn wound around other portions because it is generally difficult to rapidly reverse the traverse guide 33. Will also increase. As a result, a step is likely to be formed on the surface of the winding package Pw, which may cause the yarn Y to traverse. In addition, it may cause deterioration of the shape of the winding package Pw and / or uneven density of the winding package Pw.

As described above, the traverse device 23 is configured to reciprocally drive the endless belt 32 having the traverse guide 33 attached thereto by the traverse motor 31. Therefore, by controlling the traverse motor 31 with the control device 13, the reverse position of the traverse guide 33 can be arbitrarily changed. As an example, the control device 13 can switch the traverse width between a predetermined first width (Wa) and a second width (Wb) smaller than the first width, as shown in FIG. That is, creeping is possible). In the following, when the traverse width is the first width is the normal time, and when the traverse width is the second width is the creeping time. The distance between the reverse position of the traverse guide 33 during normal operation and the reverse position of the traverse guide 33 during creeping is ΔW (= (Wa−Wb) / 2). Hereinafter, this distance is also referred to as a creeping amount. The control device 13 can change the creeping amount by controlling the traverse motor 31. The creeping amount is generally about 5 to 20 mm, but is not limited to this. Further, the control device 13 can execute creeping at any timing. As an example, as shown in FIG. 4C, the control device 13 can execute creeping once every three reciprocations of the traverse guide 33. By performing creeping, as compared with the case where creeping is not performed, it is possible to reduce the amount of yarn wound at the axial end portion of the winding package Pw, and it is possible to reduce ear height.

If you try to execute creeping during the precision winding, the following problems may occur. Specifically, description will be made with reference to FIGS. 5A and 5B and FIGS. 6A and 6B. FIG. 5A is a graph similar to FIG. 3B, showing the relationship between the speed of the traverse guide 33 and the time when the traverse width is simply narrowed during creeping (details will be described later). FIG. 5B is an explanatory diagram showing the path of the yarn Y on the surface of the winding package Pw when the traverse width is simply narrowed during creeping, and is an enlarged view of the left end portion of the winding package Pw. . FIG. 6A is a graph similar to FIG. 3B, showing the relationship between the speed of the traverse guide 33 and time when the traverse speed is simply slowed during creeping (details will be described later). FIG. 6B is an explanatory diagram showing the path of the yarn Y on the surface of the winding package Pw when the traverse speed is simply reduced during creeping, and is an enlarged view of the left end portion of the winding package Pw. . In the graphs shown in FIGS. 5A and 6A, the solid line indicates the traverse speed during normal operation, and the broken line indicates the traverse speed during creeping.

First of all, I will explain the case where the traverse width is simply narrowed during creeping compared to normal times. As shown in FIG. 5A, simply reducing the traverse width does not change the above-described reversal time (Tr) and traverse speed (V) other than during the reversal control, but changes only the execution timing of the reversal control. It is to be. In this case, at the time of creeping, the traverse width is narrowed only by reversing the traverse guide 33 earlier than in the normal state. As a result, the traverse cycle becomes shorter during creeping than in normal times. Therefore, the precision winding is not normally performed, and the path of the yarn Y on the surface of the winding package Pw is as shown in FIG. 5B. That is, the yarns Y1 and Y2 that are part of the yarn Y that is normally wound into the winding package Pw are inverted at

points

101 and 102 on the end surface Pw1 of the winding package Pw, respectively. Further, the yarn Y3, which is a part of the yarn Y wound up in the winding package Pw during creeping, is inverted at the point 103 which is inside the

points

101 and 102 by ΔW in the traverse direction. The point 103 is located closer to the front in the rotation angle direction than the reversal position (point 104) in the case where the traverse width when the yarn Y3 is wound is the same as the normal time. That is, the yarn Y3 is wound in a state in which the yarn Y3 is largely displaced from the route 105 in which the yarn Y is wound when the creeping is not performed. Therefore, the shape of the surface of the winding package Pw is disturbed.

Next, I will explain the case where the traverse speed is simply slowed down during creeping compared to normal times. To simply reduce the traverse speed, as shown in FIG. 6A, do not change the inversion time (Tr) and the execution timing of the inversion control, and make the traverse speed other than the inversion control slower than the normal time. That is. For example, if the traverse speed during normal operation is Va and the traverse speed during creeping is Vb, then Vb <Va. In this case, since the traverse cycle is the same in the normal time and the creeping time, the wind ratio is also kept constant. In this case, as shown in FIG. 6B, the yarn Y3 wound during creeping is reversed at the point 106. The point 106 is in the same position as the point 104 described above in the rotation angle direction. However, in this case, due to the change of the traverse speed, the angle (the winding angle) formed by the yarn Y and the winding package Pw is deviated from each other between the normal time and the creeping time. That is, the yarns Y1 and Y2 that are a part of the yarn Y that is normally wound in the winding package Pw and the yarn Y3 that is a part of the yarn Y that is wound in the winding package Pw during creeping are parallel to each other. Disappear. Therefore, the shape of the surface of the winding package Pw is disturbed. Therefore, in the present embodiment, in order to suppress the fluctuation of the wind ratio even when creeping is performed during the execution of the precision winding, and to prevent the surface shape of the winding package Pw from being disturbed, the control device 13 is provided. The following control is performed.

(Details of yarn winding method using reversal control)
For details of the yarn winding method using the above-described inversion control by the control device 13, FIGS. 7 (a), (b), 8 (a), (b), 9 (a), and (b) will be used. explain. FIG. 7A is a graph showing the relationship between the position of the traverse guide 33 in the traverse direction and time. FIG. 7B is a graph showing the relationship between speed and time in the traverse direction of the traverse guide 33. FIG. 8A is a graph showing the relationship between the acceleration of the traverse guide 33 in the traverse direction and time. FIG. 8B is a graph showing the relationship between the width of the reverse region and the creeping amount, which will be described later. FIGS. 9A and 9B are explanatory views similar to FIGS. 5B and 6B, which show the paths of the yarn Y on the surface of the winding package Pw. In the following description, it is assumed that the number of rotations of the winding package Pw is constant.

First, the control device 13 performs the following control as the reversal control in the normal time (first reversal control). In the first inversion control, the control device 13 inverts the traverse guide 33 at the first inversion position (Wa / 2 in FIG. 7A) in the traverse direction (first inversion step). In the first reversal control, the time from the start of deceleration of the traverse guide 33 to the completion of reacceleration is defined as the first reversal time (Tra). Further, the control device 13 performs the following control as the reversal control during creeping (second reversal control). In the second reversal control, the controller 13 reverses the traverse guide 33 at the second reversal position in the traverse direction (Wb / 2 in FIG. 7A) (second reversal step). In the second reversal control, the time from the start of deceleration of the traverse guide 33 to the completion of reacceleration is defined as the second reversal time (Trb). In addition, a region where the traverse guide 33 moves in the traverse direction from the start of deceleration to the completion of reacceleration is referred to as a reversal region. The width of the inversion region in the second inversion control is Wt, for example (see FIG. 7A).

The controller 13 makes the second inversion time longer than the first inversion time (Trb> Tra), as shown in FIG. 7 (a). From another viewpoint, the control device 13 gently accelerates / decelerates the traverse guide 33 during the second inversion control as compared to during the first inversion control. More specifically, as compared with the maximum value of acceleration within the first inversion time during the first inversion control (Aa), the maximum value of acceleration within the second inversion time during the second inversion control (Ab) Yes) is made smaller (see FIG. 8A). In other words, the time average value of acceleration during the second reversal time during the second reversal control is made smaller than the time average value of acceleration during the first reversal control during the first reversal control.

By this, even if the traverse width is different between the normal time and the creeping time, the traverse cycle can be made equal (see FIG. 7 (a)). That is, the fluctuation of the wind ratio can be suppressed. Further, the control device 13 makes the traverse speed at the time other than the reversal control equal in the normal time and the creeping time (see FIG. 7B). Further, in the second reversal control, the control device 13 moves the traverse guide 33 to the second reversal position when half the second reversal time (Trb / 2) has elapsed since the deceleration of the traverse guide 33 was started. The traverse motor 31 is controlled so as to position.

By performing the control as described above, the yarn Y is wound into the winding package Pw as shown in FIG. 9 (a). That is, the portion of the yarn Y that is wound around the winding package Pw during creeping (the yarn Y3) is reversed at the point 107 in the traverse direction. The point 107 is at the same position as the point 104 described above in the rotation angle direction. Further, during the second inversion control (that is, when the traverse guide 33 is moving in the inversion region described above), the yarn Y3 is wound around the winding package Pw in an arc (see FIG. 9A). See hatched area 201). Further, since the traverse speeds other than during the reversal control are the same in the normal time and the creeping, the traverse angles are the same in the normal time and the creeping except the reversal control. As a result, the yarn Y3 is wound along the above-described path 105 on the inner side of the region 201 in the traverse direction. That is, in this embodiment, the precision winding is normally performed, and the shape of the surface of the winding package Pw is prevented from being disturbed.

Also, as described above, the traverse guide 33 is located at the second reversal position when half the second reversal time (Trb / 2) has elapsed since the deceleration of the traverse guide 33 was started. Therefore, the inverted portion of the yarn Y3 has a symmetrical shape with the center axis of the winding package Pw as the center line. That is, the inverted portion of the yarn Y3 is formed cleanly.

Further, the controller 13 increases the width of the reversal region in the traverse direction as the creeping amount increases (see FIG. 8B). For example, when the creeping amount is ΔW1 larger than ΔW, the control device 13 sets the width of the inversion region to Wt1 wider than Wt (see FIGS. 9A and 9B). That is, when the second reversal time becomes long due to the narrowing of the traverse width during creeping, the region in which the traverse guide 33 can move in the traverse direction becomes wide during the second reversal control. Therefore, it is possible to prevent the traverse guide 33 from being continuously located in a narrow area in the traverse direction for a long time. Further, in this case, the arc drawn when the yarn Y3 is wound around the winding package Pw becomes large (see the area 202 in FIG. 9B).

As mentioned above, the second inversion time is longer than the first inversion time. Thus, by positively prolonging the reversal time during creeping, it is possible to prolong the movement cycle of the traverse guide 33 during creeping. As a result, the movement cycle of the traverse guide 33 can be made equal in the normal time and the creeping time. Therefore, it is possible to prevent the fluctuation of the wind ratio.

Further, since the traverse cycle at the time of creeping can be adjusted by adjusting the second reversal time in this way, the traveling speed of the traverse guide 33 can be made equal between the normal time and the creeping at timings other than the reversal. it can. Therefore, the angles of the yarn Y wound on the surface of the winding package Pw can be made uniform. Therefore, it is possible to prevent the surface shape of the winding package Pw from being disturbed.

Also, the larger the creeping amount, the wider the reversal area. That is, when the second reversal time becomes long due to the narrowing of the traverse width during creeping, the movable area of the traverse guide 33 becomes large during the second reversal control. Therefore, it is possible to prevent the traverse guide 33 from being continuously located in a narrow area in the traverse direction for a long time. Therefore, it is possible to prevent the yarn Y from being intensively wound in a narrow area on the surface of the winding package Pw.

In addition, the time from the start of deceleration of the traverse guide 33 until the traverse guide 33 reaches the second reversal position and the time from the departure of the traverse guide 33 from the second reversal position to the completion of the re-acceleration. Can be equal. As a result, the shape of the inverted portion of the yarn Y can be made symmetrical with respect to the center axis of the winding package Pw (that is, the inverted portion can be formed neatly). Therefore, it is possible to prevent the shape of the inverted portion of the surface of the winding package Pw from being disturbed.

Further, the control device 13 performs control based on information regarding the relationship between the rotation angle of the winding bobbin Bw and the position of the traverse guide 33. As a result, as compared with the case of performing control using a complicated mechanical structure, for example, a complicated operation of performing creeping while maintaining a constant wind ratio can be facilitated. Further, by rewriting the information, it is possible to easily adjust the position and speed of the traverse guide 33 during the second reversal control.

Also, the traverse motor 31 is configured to be able to drive forward and reverse. This allows the traverse guide 33 to reciprocate by the forward and reverse driving of the traverse motor 31. Therefore, the reversing position and timing of the traverse guide 33 can be finely controlled by the control unit. Therefore, fine control of creeping can be easily performed.

Further, the traverse guide 33 can be easily linearly reciprocated by stretching the portion of the endless belt 32 to which the traverse guide 33 is attached and driving the same reciprocally. Therefore, it is possible to easily and regularly wind the yarn Y around the surface of the winding package Pw.

Next, a modified example in which the above embodiment is modified will be described. However, the components having the same configuration as the above embodiment are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

(1) In the above-described embodiment, the control device 13 is configured to gently accelerate and decelerate the traverse guide 33 during the second inversion control as compared with during the first inversion control, but the invention is not limited to this. For example, as shown in FIGS. 10A, 10B, and 11, the control device 13 sets the maximum value of the acceleration within the second reversal time during the second reversal control to the first acceleration during the first reversal control. It may be equal to the maximum value of the acceleration within the reversal time. Then, the control device 13 may accelerate the traverse guide 33 again after stopping the traverse guide 33 at the second reversal position in the traverse direction for a predetermined time. In this way, the second inversion time may be set longer than the first inversion time. When the second reversal control in the above embodiment is A control and the second reversal control in the above modification examples (FIGS. 10A, 10B, and 11) is B control, the control device 13 is as follows. You may perform various controls. That is, the control device 13 may perform only the A control or only the B control as the second reversal control during the winding operation. Alternatively, the control device 13 may perform the A control and the B control in combination during the winding operation. More specifically, the control device 13 may repeatedly perform A control and B control as a second inversion control in a predetermined pattern. As an example of repetition, the control device 13 may alternately perform A control and B control.

(2) In the above embodiments, the larger the creeping amount, the wider the width of the reversal region of the traverse guide 33 in the traverse direction, but the invention is not limited to this. The width of the reversal region may be constant regardless of the creeping amount.

(3) In the above-described embodiments, the control device 13 moves to the second reversal position when the half of the second reversal time has elapsed since the deceleration of the traverse guide 33 was started in the second reversal control. The traverse motor 31 is controlled so as to position the traverse guide 33. However, it is not limited to this. For example, the control device 13 may perform control such that the traverse guide 33 is rapidly decelerated and then gently re-accelerated in the second reversal control. Alternatively, the control device 13 may perform control such that the traverse guide 33 is gently decelerated and then rapidly accelerated in the second reversal control.

(4) In the above-described embodiments, the storage unit 19 of the control device 13 stores both the table and the calculation formula as information regarding the relationship between the rotation angle of the winding bobbin Bw and the position of the traverse guide 33 in the traverse direction. Although it is assumed to be stored, it is not limited to this. For example, the storage unit 19 may store only a calculation formula for calculating the position and / or speed of the traverse guide 33 based on the rotation angle of the winding bobbin Bw. That is, the control device 13 may always calculate the position and / or the speed of the traverse guide 33 based on the rotation angle of the winding bobbin Bw and the calculation formula during the winding operation. Alternatively, only the table may be stored in the storage unit 19 as information regarding the relationship between the rotation angle of the winding bobbin Bw and the position, speed, and acceleration of the traverse guide 33.

(5) In the above embodiments, the traverse guide 33 is attached to the endless belt 32, but the present invention is not limited to this. For example, the traverse guide 33 may be attached to the tip end portion of the swing-driven arm (see Japanese Patent Laid-Open No. 2007-153554). Alternatively, the traverse guide 33 may be reciprocally driven by a linear motor or the like.

(6) In the embodiments described above, the traverse guide 33 is driven by the drive source configured to be capable of forward and reverse driving, but the present invention is not limited to this. For example, the rewinder 1 may include a cam type traverse device that uses a motor that is rotationally driven in one direction as a drive source.

(7) In the above embodiments, the number of rotations of the winding bobbin Bw is constant, but the number of rotations is not limited to this. That is, the control device 13 may control the winding motor 22 and the traverse motor 31 so as to keep the wind ratio constant in order to perform precision winding, and changes the rotation speed of the winding bobbin Bw during the winding operation. May be.

(8) The present invention is not limited to the rewinder 1 and can be applied to various yarn winding machines.

1 Rewinder (thread winder)
13 Control device (control unit)
19 storage unit 22 winding motor (bobbin drive unit)
31 Traverse motor (guide drive unit)
32 Endless belt (belt member)
33 Traverse Guide Bw Winding bobbin (bobbin)
Pw winding package (package)
Y thread

Claims

The running yarn can be wound around a rotating bobbin while traversing with a traverse guide, and the wind ratio, which is the ratio of the number of revolutions of the bobbin to the number of reciprocating movements of the traverse guide per unit time, is kept constant. A yarn winding machine configured to form a package while executing a precision winding,
A guide drive unit that reciprocally drives the traverse guide in a predetermined traverse direction, and that can change the reverse position of the traverse guide during a yarn winding operation;
And a control unit,
The control unit includes:
The guide drive unit is controlled to decelerate the traverse guide traveling outward at a predetermined speed in the traverse direction to reverse the traverse guide inward at a predetermined first reversal position, and re-rotate to the predetermined speed. First reversal control to accelerate,
In the traverse direction, the guide drive unit is controlled to decelerate the traverse guide traveling outward at the predetermined speed to move the traverse guide inward at the second reversal position inside the first reversal position. A second reversal control for reversing and re-accelerating to the predetermined speed can be executed;
During the execution of the precision winding, a time period from the deceleration start of the traverse guide in the second reversal control to the reversal control is longer than the first reversal time which is a time from the deceleration start of the traverse guide to the reacceleration completion in the first reversal control. A yarn winding machine characterized in that a second reversal time which is a time until completion of acceleration is lengthened.
The control unit includes:
The longer the distance between the first reversal position and the second reversal position in the traverse direction, the wider the width of the region in which the traverse guide moves in the traverse direction within the second reversal time in the second reversal control. The yarn winding machine according to claim 1, wherein the yarn winding machine is widened.
The control unit includes:
In the second inversion control, when the half of the second inversion time has elapsed since the deceleration of the traverse guide was started, the traverse guide is positioned at the second inversion position in the traverse direction, The yarn winding machine according to claim 1 or 2, wherein the guide driving unit is controlled.
A bobbin drive unit that rotationally drives the bobbin,
The control unit includes:
A storage unit that stores information regarding the relationship between the rotation angle of the bobbin and the position of the traverse guide in the traverse direction,
The yarn winding machine according to any one of claims 1 to 3, wherein the bobbin drive section and the guide drive section are controlled based on the information stored in the storage section.
The guide driver is
The yarn winding machine according to any one of claims 1 to 4, further comprising a driving source configured to be capable of forward and reverse driving.
The guide driver is
The yarn winding machine according to claim 5, further comprising a belt member to which the traverse guide is attached and which is reciprocally driven by the drive source.
Precision winding that winds a running yarn while winding it on a rotating bobbin while traversing it with a traverse guide and maintains a constant wind ratio, which is the ratio of the number of revolutions of the bobbin to the number of reciprocating movements per unit time of the traverse guide. A yarn winding method for forming a package while executing
In a predetermined traverse direction, a first reversal step of decelerating the traverse guide traveling outward at a predetermined speed to invert it at a predetermined first reversal position, and re-accelerating to the predetermined speed.
In the traverse direction, the traverse guide traveling outward at the predetermined speed is decelerated to be inverted inward at the second inversion position which is inside the first inversion position, and is re-reproduced until the predetermined speed. A second inversion step of accelerating,
During the execution of the precision winding, the time from the deceleration start of the traverse guide in the second reversal step to the reversal start from the deceleration start of the traverse guide in the first reversal step to the completion of reacceleration A yarn winding method characterized in that a second reversal time which is a time until completion of acceleration is lengthened.