JP2010189127A - Yarn winding machine and yarn winding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for preventing the generation of a ribbon regardless of a classification of a yarn kind while restraining a bulge. <P>SOLUTION: A winder 1 has a contact roller 8 contacting a package 4 when forming the package 4, a traverse device 7 arranged at the upstream side in the traveling direction of elastic yarn 2 to the contact roller 8, a free length changing means 9 capable of changing the free length FL of the elastic yarn 2 existing between the contact roller 8 and the traverse device 7 when forming the package 4, and a control part 80 for controlling the free length changing means 9 so as to reduce the free length FL toward the winding finish after increasing the free length FL in the winding start of the package 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  As a technique for preventing a so-called bulge when winding a yarn traversed by a traverse device onto a winding bobbin via a contact roller to form a package, Patent Document 1 discloses a traverse angle at an initial stage of winding. To reduce the tightness of the yarn layer in the initial stage. This Patent Document 1 further describes that the end of the winding is reached while gradually lowering the twill angle so that the number of winds does not fall below 1, for the purpose of avoiding the ribbon.

JP-A-9-71367

  However, according to the technique of the above-mentioned Patent Document 1, in the case where a relatively small bulge is generated, the bulge can be suppressed without problems, but in the case where a relatively large bulge is generated. If you try to suppress the bulge, ribbon will be generated. Hereinafter, after explaining the meaning of each term, the above-mentioned problems will be described in more detail.

  The bulge is a phenomenon in which the middle of the package end surface bulges out by stacking the yarns.

  Ribbon is a phenomenon in which the yarn is wound up so as to overlap on the same route on the peripheral surface of the package. When this ribbon is generated, various problems such as causing the end face of the package to fall, inducing the vibration of the contact roller, and causing the package to be unwound in a later process are caused. As for the above-described unwinding failure, particularly in the case of elastic yarn, the above-described unwinding failure is particularly likely to occur because the yarn is pulled in the circular tangential direction of the package. There is a risk of thread breakage.

  The wind number N is a numerical value for predicting the occurrence of the ribbon. FIG. 3 is a diagram for explaining the definition of the number of winds. A rectangle 90 shown in FIG. 3 indicates a development surface of the peripheral surface of the package, and the winding position of the yarn is indicated by symbols a to d on the development surface. Here, the symbol D is the winding diameter of the package, the symbol S is the stroke, the symbol WA is the traverse angle, and πDtanWA is advanced in the axial direction of the package while the yarn makes one round on the circumferential surface of the package in the circumferential direction. Distance. In the example of FIG. 3, when the initial winding position of the yarn is indicated by a symbol “a”, the winding position of the second turn becomes the symbol “b” and reaches the upper right corner of the development surface, and then the winding position is indicated by a broken line. It becomes the code | symbol c and the code | symbol d. When the yarn is wound at the winding position as shown in FIG. 3, the yarn is wound so as to overlap on the same route on the peripheral surface of the package, that is, a ribbon is generated. In order to analyze the occurrence of this ribbon, the wind number N of the following formula (1) representing how many times the yarn is folded back during the double stroke 2 × S is used. According to the following formula (1), the wind number N is 4 in the case of FIG. Thus, when the number of winds N is an integer value and N = 1, the degree of local overlap between the yarns is significantly increased. The wind number N when N = 1 is generally called the dangerous wind number Nd. Therefore, in order to prevent the occurrence of a ribbon, it is general that the wind number N avoids the dangerous wind number Nd. It is said.

  The explanation of each term has been described above, and the problem of the present application will be described below with reference to FIGS. 1 and 2. FIG. 1 is a diagram for explaining a technique for suppressing a bulge by increasing / decreasing a twill angle. FIG. 2 is a diagram for explaining a new problem that occurs when an attempt is made to suppress bulge by increasing or decreasing the twill angle. In each figure, the horizontal axis indicates the winding diameter of the package, and the vertical axis indicates the traverse angle.

  FIG. 1A shows a winding without a bulge countermeasure, and FIG. 1B shows a winding with a bulge countermeasure disclosed in Patent Document 1. FIG. In the figure, a two-dot chain line indicated by “N = Nd” illustrates a condition in which the wind number N matches the dangerous wind number Nd. As shown in (a1) of FIG. 1A, when winding is performed at a constant traverse angle WA regardless of the winding diameter D of the package (hereinafter also simply referred to as winding diameter D), FIG. As shown in (a2) of (a), the middle of the package end surface bulges, that is, a bulge is generated due to the stacking of the yarn winding. Therefore, in Patent Document 1, as shown in (b1) of FIG. 1 (b), the twill angle WA is increased in the initial stage of winding (the winding diameter D is small), and the yarn layer in this initial stage is increased. The density is gradually reduced. Further, in the latter stage of the end of winding (the winding diameter D is large), the twill angle WA is reduced so that the twill angle WA line does not straddle the two-dot chain line indicating the generation condition of the ribbon. According to such winding, as shown in (b2) of FIG. 1 (b), the yarn layer density increases due to the stacking of the yarn winding, and the yarn layer density accompanying the increase in the twill angle WA. As a result, a package with a suppressed bulge is formed.

  However, for example, when winding a yarn type such as an elastic yarn, the tightening force is large, so that a bulge more marked than the bulge shown in (a2) of FIG. And if this remarkable bulge is also suppressed by the technique of the above-mentioned Patent Document 1, as shown in (c1) of FIG. 2 (c), the twill angle WA must be further increased. As a result, the line of the twill angle WA straddles the two-dot chain line indicating the generation condition of the ribbon and the above-described ribbon is generated, and when the winding diameter D corresponds to the intersection indicated by the symbol X in FIG. As shown in (c2) of FIG. 2), the end face of the package may fall and problems such as the above-described unwinding failure may occur. As described above, in the technique disclosed in Patent Document 1, even if bulge can be suppressed, the generation of a ribbon may not be avoided depending on the yarn type.

  The present invention has been made in view of these points, and a main object thereof is to provide a technique for preventing the occurrence of a ribbon regardless of the type of yarn type while suppressing bulges.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above, and the inventors of the present invention have conducted intensive research to drastically review the technology for suppressing bulges. As a result, for example, in FIG. As shown in FIG. 5, attention was paid to increasing or decreasing the so-called free length during the formation of the package.

  Here, the relationship between the free length and the bulge suppressing effect will be described. FIG. 4 is a diagram illustrating the relationship between free length and traverse delay. The free length FL (FL1, FL2) shown in FIG. 4 is the free length of the yarn from when the yarn engaged with the traverse guide of the traverse device is released from the traverse guide to contact the peripheral surface of the contact roller. That is. The free length FL can be increased or decreased by moving the traverse guide away from or closer to the contact roller as shown. When the free length FL is increased from FL1 to FL2, the angle formed by the straight line perpendicular to the axial direction of the bobbin and the running direction of the wound yarn, that is, the twill angle WA is constant (WA = WA1). If there is, the traverse delay E which is the difference between the axial position of the traverse guide and the axial position where the yarn is actually inherited on the peripheral surface of the package increases from E1 to E2. On the other hand, when the free length FL is decreased from FL2 to FL1, similarly, if the traverse angle WA is constant, the traverse delay E decreases from E2 to E1.

  This will be specifically described with reference to FIG. 4. First, when the traverse angle WA is WA1 and the free length FL is FL1, the yarn is inherited by the contact roller at the axial position N1. The traverse delay E at this time is E1. That is, even if the traverse guide reaches the end of the traverse range, the yarn is actually wound around the package at a position closer to the center in the axial direction by the traverse delay E1. Similarly, when the traverse angle WA is directly set to WA1 and the free length FL is set to FL2, the traverse delay E becomes E2. Therefore, when the free length FL is increased from FL1 to FL2, the end face of the package is formed at a position closer to the center in the axial direction by the sign ΔE (= E2−E1) in the drawing. On the other hand, when the free length FL is decreased from F2 to FL1, the end face of the package is similarly formed at a position closer to the axial end by ΔE. That is, in short, when the free length FL is increased, the winding width of the package is decreased, and conversely, when the free length FL is decreased, the winding width of the package is increased.

  The present invention intends to suppress the bulge as shown in FIG. 5 by incorporating a technical interlocking relationship between the free length FL and the winding width of the package. FIG. 5 is a diagram for explaining the reason for suppressing bulges using free length. FIG. 5A shows winding when the free length is constant, and FIG. 5B shows winding when the free length is changed from FL1 → FL2 → FL1 (where FL1 <FL2). . That is, when the free length FL is wound at a constant without incorporating the technique disclosed in the above-mentioned Patent Document 1 (increase / decrease in the twill angle WA), it is assumed that there is no tightening force due to the stacking of the winding of the yarn. The winding width is constant from the beginning of winding to the end of winding as shown in the left diagram of FIG. 5A, and actually, as shown in the right diagram of FIG. The middle of the package end face bulges, that is, a bulge is generated. On the other hand, if the free length FL is changed from FL1 → FL2 → FL1, assuming that there is no tightening force due to the accumulation of the winding of the yarn, the winding is started from the beginning as shown in the left figure of FIG. 5 (b). When the width gradually decreases and eventually the free length FL becomes FL2, the winding width becomes smaller by ΔE × 2 minutes than the initial winding width, and then the winding width gradually increases toward the end of the winding, and eventually the free length When the FL becomes the original FL1, the winding width coincides with the initial winding width. In short, the package cross-sectional shape is a drum shape. Therefore, in actuality, the concave portion in the middle of the package end surface disappears as shown in the right diagram of FIG. 5B due to the tightening force caused by stacking the winding of the yarn, that is, the package end surface becomes flat.

  In short, the above technique tries to offset the bulge caused by the winding force of the winding of the yarn by increasing or decreasing the winding width so that the package cross-sectional shape becomes a drum shape. In other words, the bulge is to be suppressed by increasing or decreasing the free length FL.

  It should be noted that increasing or decreasing the free length FL does not cause an undesired change in the wind number N. Here, the superiority of the above-mentioned technique over the above-mentioned Patent Document 1 is recognized.

  The technical spirit of the present invention is as described above. Next, means for solving the above-described problems and the effects thereof will be described.

  According to the first aspect of the present invention, the yarn winding machine forming the package is configured as follows. That is, the yarn winding machine includes a contact roller that contacts the package during package formation, a traverse device that is disposed upstream of the contact roller in the running direction of the yarn, and during the package formation, Free length changing means capable of changing the free length of the yarn between the contact roller and the traverse device, and the free length is increased at the beginning of winding of the package, and then the free length is increased toward the end of winding. And control means for controlling the free length changing means so as to decrease. According to the above configuration, bulge can be suppressed. Moreover, since the increase / decrease in the free length does not cause a change in the number of winds, it is possible to easily realize winding that avoids the number of dangerous winds while suppressing bulges. If the number of dangerous winds can be avoided, it is possible to avoid various inconveniences such as causing the end face of the package to fall, inducing contact roller vibrations, and causing the package to be unwound in a subsequent process.

  Note that, as indicated by a broken line in (d1) of FIG. 2D, the case where the twill angle is constant or the case where the tread angle is increased or decreased similarly to the free length can be considered.

  The above-described yarn winding machine is further configured as follows. That is, the yarn winding machine further includes a twill angle changing means capable of changing the twill angle. The control means controls the traverse angle changing means to increase the traverse angle at the beginning of winding of the package and then decrease the traverse angle toward the end of winding. Thus, when suppressing the bulge, if the increase / decrease of the free length and the increase / decrease of the twill angle are used together, the increase / decrease width of the free length for suppressing the bulge can be reduced, and the free length changing means Can be configured compactly.

  According to a second aspect of the present invention, a package is formed using a contact roller that comes into contact with the package during the formation of the package, and a traverse device that is disposed upstream of the contact roller in the running direction of the yarn. The yarn winding to be formed is performed by the following method. That is, the free length of the yarn between the contact roller and the traverse device is increased at the beginning of winding of the package and then decreased toward the end of winding. According to the above configuration, bulge can be suppressed. Moreover, since the increase / decrease in the free length does not cause a change in the number of winds, it is possible to easily realize winding that avoids the number of dangerous winds while suppressing bulges. If the number of dangerous winds can be avoided, it is possible to avoid various inconveniences such as causing the end face of the package to fall, inducing contact roller vibrations, and causing the package to be unwound in a subsequent process.

  The above-described yarn winding is further performed by the following method. That is, the twill angle is increased at the beginning of winding of the package and then decreased toward the end of winding. Thus, when suppressing the bulge, if the increase / decrease of the free length and the increase / decrease of the twill angle are used together, the increase / decrease width of the free length for suppressing the bulge can be reduced.

  Further, when the yarn is an elastic yarn, the winding force is large, so that a remarkable bulge is generated as described above. The ribbon cannot be avoided if it is attempted to deal with this remarkable bulge only by increasing / decreasing the twill angle, but if it is addressed by increasing / decreasing the free length, the ribbon can be avoided. As described above, the technique for suppressing the bulge by increasing or decreasing the free length is particularly beneficial when the yarn is an elastic yarn.

Diagram for explaining technology to suppress bulge by increasing / decreasing twill angle Diagram for explaining a new problem when trying to suppress bulge by increasing or decreasing the twill angle Illustration for explaining the definition of the number of winds Diagram showing the relationship between free length and traverse delay Illustration to explain the reason for suppressing bulges using free length Front view of the winder according to the first embodiment of the present invention Winder system diagram Graph showing the content of free length control based on the winding diameter of the package Flow chart of control program Winder operation diagram Graph showing the relationship between package winding time and slide box height position The graph which shows the test result of the test for confirming the technical effect of this invention It is a figure similar to FIG. 8, Comprising: The graph which shows the content of the control of the free length based on the winding diameter of a package, and a twill angle in 2nd embodiment of this invention It is a figure similar to FIG. 9, Comprising: The flowchart which concerns on 2nd embodiment of this invention

  Hereinafter, a winder 1 as a yarn winding machine according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a front view of the winder according to the first embodiment of the present invention. FIG. 7 is a system diagram of the winder.

  The winder 1 is a yarn winder that winds an elastic yarn 2 as a yarn around a bobbin 3 to form a package 4 (see FIG. 10). In the following, a yarn winding machine for winding the elastic yarn 2 will be described. However, the present invention is not limited to this, and a yarn winding machine for winding yarns of other yarn types can also be used. . As shown in FIG. 6, the winder 1 includes a machine body frame 5, a turret plate 6, a slide box 16, a traverse device 7, a contact roller 8, and a free length changing unit 9. As shown in FIG. 7, each configuration of the winder 1 is electrically connected to a control unit 80 (control means). The control unit 80 includes a CPU (Central Processing Unit) which is an arithmetic processing unit, a control program executed by the CPU and a ROM (Read Only Memory) in which data used for the control program is stored, and data when the program is executed. RAM (Random Access Memory) for temporary storage. Then, the control program stored in the ROM is read by the CPU and executed on the CPU, so that the control program can control the hardware such as the CPU by means for controlling the free length changing means 9, which will be described later. It functions as a means for controlling the traverse change means.

  As shown in FIG. 6, the turret plate 6 is provided on the machine body frame 5, and can be rotated around the rotation shaft 11 by a rotation driving device (not shown). On the turret plate 6, two bobbin holders 12 on which the bobbin 3 is mounted are provided so as to be symmetric with respect to the rotation shaft 11. The turret plate 6 is rotated by the above-described rotation driving device, so that the bobbin 3 at the upper winding position can be replaced. As shown in FIG. 7, the two bobbin holders 12 provided on the turret plate 6 are respectively connected to the drive motor 27 and are rotated by the drive motor 27. Each drive motor 27 is electrically connected to the control unit 80, so that the control unit 80 can control the rotation speed of the bobbin holder 12 by controlling the drive of the drive motor 27. The bobbin holder 12 is provided with a bobbin holder rotation sensor 35, and the bobbin holder rotation sensor 35 is electrically connected to the control unit 80. The bobbin holder rotation sensor 35 detects the rotation speed of the bobbin holder 12 and transmits a detection signal to the control unit 80. Therefore, the control unit 80 can obtain the rotation speed of the bobbin holder 12 based on the detection signal by receiving the detection signal from the bobbin holder rotation sensor 35.

  As shown in FIG. 6, the slide box 16 is guided in the vertical direction of the body frame 5 by a pair of rails 17 and 17 provided at both ends of the slide box 16, and is movable in this direction. When the slide box 16 is raised, the traverse device 7 fixed to the slide box 16 is separated from the contact roller 8, and when the slide box 16 is lowered, the traverse device 7 approaches the contact roller 8. The slide box 16 is moved up and down by the above-described free length changing means 9.

  The traverse device 7 is a device that traverses the elastic yarn 2 and is fixed in position relative to the slide box 16. The traverse device 7 is of a type in which the traverse width is fixed to a constant width, and includes a traverse cam 30, a traverse guide 31, and a traverse motor 28 (see FIG. 7). The traverse cam 30 is rotatably supported in the slide box 16 and is provided with a spiral traverse cam groove on the peripheral surface. The traverse guide 31 moves along the traverse cam groove when the traverse cam 30 rotates, and reciprocates in the axial direction of the traverse cam 30. The traverse guide 31 guides the traveling elastic yarn 2 to the contact roller 8 while swinging left and right. The traverse motor 28 rotationally drives the traverse cam 30 and is electrically connected to the control unit 80. The control unit 80 controls the driving of the traverse motor 28, thereby rotating the traverse cam 30. Can be controlled freely. Since the above-mentioned traverse angle WA is determined by the rotational speed of the traverse cam 30, in this sense, the control unit 80 can freely control the traverse angle WA through the control of the rotational speed of the traverse cam 30. ing. The above-described traverse angle changing means includes a traverse cam 30 and a traverse motor 28 that is a drive source of the traverse cam 30.

  The contact roller 8 is disposed downstream of the traverse device 7 in the traveling direction of the elastic yarn 2. The contact roller 8 rotates following the package 4 during formation of the package 4, inherits the elastic yarn 2 traversed by the traverse device 7, and delivers the elastic yarn 2 to the peripheral surface of the package 4. . The contact roller 8 is rotatably supported on the first end 13 a side of the arm 13. The second end 13 b of the arm 13 is inserted into the slide bar 14 supported by the slide box 16 and is slidable in the vertical direction with respect to the slide box 16. That is, the contact roller 8 is configured to be slidable in the vertical direction with respect to the slide box 16 via the arm 13. The contact roller 8 is provided with a rotation sensor 40 that detects the rotation speed of the contact roller 8. The rotation sensor 40 is electrically connected to the control unit 80, detects the rotation speed of the contact roller 8 that rotates following the package 4, and transmits a detection signal to the control unit 80. Therefore, the control unit 80 can acquire the rotational speed of the contact roller 8 based on the detection signal by receiving the detection signal from the rotation sensor 40. In order to keep the traveling speed of the elastic yarn 2 constant, that is, the controller 80 appropriately controls the drive motor 27 so that the rotational speed or the peripheral speed of the contact roller 8 is constant.

  During the formation of the package 4, the free length changing means 9 raises and lowers the slide box 16 to change the free length FL (see FIG. 10) of the elastic yarn 2 between the contact roller 8 and the traverse device 7. Is. The free length changing means 9 includes a ball screw mechanism 15, a position detection sensor 18, and a cylinder 19. Here, the free length FL is the free length of the elastic yarn 2 until the elastic yarn 2 engaged with the traverse guide 31 of the traverse device 7 is released from the traverse guide 31 and comes into contact with the peripheral surface of the contact roller 8. I mean.

  The ball screw mechanism 15 is a drive source for moving the slide box 16 up and down, and includes a screw rod 20, a ball nut 21, and a lift drive unit 22. The screw rod 20 is disposed along the vertical direction of the body frame 5 and is supported rotatably with respect to the body frame 5. The ball nut 21 is screwed onto the screw rod 20 and engages with the slide box 16 upward. The lifting / lowering drive unit 22 rotationally drives the screw rod 20, and when the screw rod 20 rotates forward and backward by the lifting / lowering drive unit 22, the slide box 16 moves up and down via the ball nut 21. The elevating drive unit 22 includes a motor 23, a first gear 24, a belt 25, and a second gear 26. The motor 23 is connected to the first gear 24, the belt 25 is wound between the first gear 24 and the second gear 26, and the screw rod 20 is connected to the second gear 26. With this configuration, when the motor 23 is driven, the rotational driving force of the motor 23 is transmitted to the screw rod 20 via the first gear 24, the belt 25, and the second gear 26, and the screw rod 20 rotates. As shown in FIG. 7, the motor 23 is electrically connected to the control unit 80, so that the control unit 80 can control the motor 23. Therefore, the control unit 80 can freely move the slide box 16 up and down through the control of the motor 23.

  The position detection sensor 18 is provided to face the second gear 26, and detects the rotation of the second gear 26 at every predetermined angle. The position detection sensor 18 is electrically connected to the control unit 80, and transmits a detection signal to the control unit 80 each time rotation of the second gear 26 is detected for each predetermined angle. Therefore, the control unit 80 can acquire the height position of the slide box 16 and consequently the height position of the traverse device 7 supported by the slide box 16 based on the number of times the detection signal from the position detection sensor 18 is received. It is like that.

  The cylinder 19 bears most of the weight of the slide box 16 by the cylinder pressure, and is used for moving the slide box 16 up and down by the above-described lift drive unit 22 with a small driving force. The cylinder pressure of the cylinder 19 is adjusted by the air supply unit 36.

  As described above, the free length changing means 9 includes the position detection sensor 18 that detects the height position of the traverse device 7, so that the winder 1 appropriately feeds back the detection result of the position detection sensor 18 while traversing the device 7. Thus, the above-described free length FL can be accurately controlled.

  FIG. 8 is a graph showing the content of free length control based on the winding diameter of the package. The horizontal axis indicates the winding diameter D of the package 4, and the vertical axis indicates the free length FL. The ROM of the control unit 80 described above stores a correspondence relationship FL = f (D) between the package winding diameter D and the free length FL as shown in FIG. 8, for example, in a table format. Specifically, as shown in FIG. 8, this correspondence relationship FL = f (D) is the winding diameter in the beginning of winding of the package 4, that is, in the period from the winding diameter D to D2. As the D increases, the free length FL increases rapidly from FL1 to FL2, and then reaches the end of winding, that is, during the period from the winding diameter D to D3, the winding diameter D increases. Along with this, the free length FL gradually decreases from FL2 to FL1. As described above, the free length FL is rapidly increased at the beginning of winding of the package 4 and gradually decreased toward the end of winding. In other words, (D2-D1) <(D3-D2) is as follows. Because of the reason. That is, the yarn layer at the beginning of winding is strongly compressed, while the yarn layer at the end of winding is hardly compressed.

  Next, the operation of the winder 1 will be described with reference to FIGS. FIG. 9 is a flowchart of the control program. FIG. 10 is an operation diagram of the winder. In the present embodiment, unlike the above-described Patent Document 1, increase / decrease of the twill angle WA for suppressing the bulge is not adopted.

  When the winding of the elastic yarn 2 is started with the free length FL set to FL1 as shown in FIG. 10A, the control unit 80 first calculates the winding diameter D of the current package 4 ( S300). Specifically, the control unit 80 acquires the rotation speed of the contact roller 8 based on the detection signal received from the rotation sensor 40 and acquires the rotation speed of the bobbin holder 12 based on the detection signal received from the bobbin holder rotation sensor 35. To do. And the control part 80 calculates the winding diameter D of the present package 4 based on the rotational speed of the contact roller 8, the rotational speed of the bobbin holder 12, and the diameter of the contact roller 8 previously memorize | stored in ROM. .

  Next, the control unit 80 calculates an increment ΔD of the winding diameter D of the package 4 (S310). Specifically, the control unit 80 obtains the difference between the previous winding diameter D calculated in the above-described S300 and the winding diameter D of the package 4 calculated in the above-described S300, so that the package 4 The increment ΔD of the winding diameter D is calculated.

  Next, the control unit 80 calculates a free length FL corresponding to the winding diameter D as shown in FIG. 8 (S320). Specifically, the control unit 80, based on the winding diameter D calculated in S300 above and the correspondence FL = f (D) (see FIG. 8) stored in the table format in the ROM, As shown in FIG. 8, a free length FL corresponding to the winding diameter D is calculated.

  Next, the control unit 80 calculates the change amount ΔFL of the free length FL (S330). Specifically, the control unit 80 obtains the difference between the past free length FL calculated in the above S320 and the free length FL calculated this time in the above S320, so that the change amount ΔFL of the free length FL is obtained. Is calculated. Note that, according to FIG. 8, the amount of change ΔFL is a positive value during the period from the winding diameter D from D1 to D2. On the other hand, the change amount ΔFL is a negative value during the period when the winding diameter D is from D2 to D3.

  Next, the control unit 80 calculates the movement amount ΔG of the slide box 16 (S340). Specifically, the control unit 80 includes the increment ΔD of the winding diameter D of the package 4 calculated in S310, the change amount ΔFL of the free length FL calculated in S330, the following equation (2), Based on the above, the movement amount ΔG of the slide box 16 (however, the upward direction of the body frame 5 is assumed to be positive) is calculated. Since ΔFL in the following formula (2) may be a negative value as described above, if the absolute value of the change amount ΔFL exceeds the increment ΔD, then the movement amount ΔG is negative. It becomes the value of.

  Next, the control unit 80 moves the slide box 16 in the vertical direction based on the movement amount ΔG calculated in S340 (S350). Specifically, the control unit 80 controls the drive of the motor 23 to slide until the height position of the slide box 16 obtained based on the detection signal received from the position detection sensor 18 changes by the movement amount ΔG. The box 16 is raised and lowered.

  Next, the control unit 80 determines whether or not the winding diameter D of the package 4 calculated in S300 has reached the predetermined winding diameter Dmax (S360), and the winding diameter D still reaches the predetermined winding diameter Dmax. If it is determined that there is not (S360: NO), the process returns to S300. On the other hand, if it is determined that the winding diameter D has reached the predetermined winding diameter Dmax (S360: YES), the turret plate 6 is rotated to change the bobbin, and a new winding is started.

  According to the above series of controls, the operation of the winder 1 shown in FIG. 10 is realized. That is, under the correspondence relationship FL = f (D) shown in FIG. 8, as shown in FIG. 10, the free length FL gradually increases during the period from the winding diameter D to D2 as shown in FIG. The free length FL gradually decreases from FL2 to FL1 during the period from the first to FL2 and the winding diameter D from D2 to D3.

  Further, according to the above-described series of controls, the slide box 16 is lifted and lowered as shown by a solid line in FIG. FIG. 11 is a graph showing the relationship between the winding time of the package and the height position of the slide box. The horizontal axis indicates the winding time, and the vertical axis indicates the height position of the slide box 16. In FIG. 11, the solid line shows the change in the height position of the slide box 16 according to the present embodiment, and the two-dot chain line shows the change in the height position of the slide box 16 when the free length FL is constant. Show. The two-dot chain line rises to the right because the slide box 16 is lifted so that the free length FL can be maintained constant even when the contact roller 8 is pushed up due to the package 4 being rolled up. This is to cancel the increment ΔD of the winding diameter D. In the present embodiment, as indicated by the solid line in the drawing, the slide box 16 has an absolute value of the variation ΔFL that exceeds the increment ΔD during the period from the winding diameter D of the package 4 to D3 to D3. The movement amount ΔG of the slide box 16 is a negative value, and therefore the slide box 16 is lowered.

  The operation of the winder 1 has been described above. Next, since the test for confirming the effect which suppresses the bulge of the winder 1 which concerns on this embodiment was implemented, the result is reported.

(Test conditions)
Used yarn: Spandex yarn 44dtex
Twill angle WA: 12 deg at the beginning of winding and 10 deg at the end of winding. If the twill angle WA is constant, the winding number N is the same as the dangerous winding number Nd at the end of winding, so the twill angle WA is slightly reduced at the end of winding. This decrease in the twill angle WA is not related to the suppression of the bulge.
Free-length FL: As shown by a two-dot chain line in FIG.

  FIG. 12 is a graph showing test results of a test for confirming the technical effect of the present invention. The horizontal axis represents the winding diameter D of the package 4, and the vertical axis represents the end face of the package and the free length FL. In FIG. 12, the alternate long and two short dashes line indicates the correspondence relationship FL = f (D) employed in the test. In FIG. 12, a thick solid line indicates an example in which the free length FL is increased or decreased based on the correspondence relationship FL = f (D), and a thin solid line indicates a comparative example in which the free length FL is constant (minimum). The left vertical axis is based on the end face of the bobbin 3 (origin). In FIG. 12, the axial direction of the bobbin 3 coincides with the vertical direction of the paper surface, and the radial direction of the bobbin 3 coincides with the horizontal direction of the paper surface.

  According to FIG. 12 above, it can be seen that if the free length FL is increased at the beginning of winding of the package 4 and then the free length FL is decreased toward the end of winding, the bulge can be sufficiently suppressed. In addition, the trace of the falling was not recognized by the end surface of the package 4 which concerns on an Example, and the end surface of the package 4 which concerns on a comparative example.

(Summary)
(Claim 1, Claim 3)
As described above, in the above embodiment, the winder 1 forming the package 4 is configured as follows. That is, the winder 1 includes a contact roller 8 that contacts the package 4 during the formation of the package 4, a traverse device 7 disposed on the upstream side of the contact roller 8 in the traveling direction of the elastic yarn 2, and a package 4 during the formation of the package 4. The free length changing means 9 capable of changing the free length FL of the elastic yarn 2 between the contact roller 8 and the traverse device 7 (specifically, the traverse guide 31), and the free length FL is increased at the beginning of winding of the package 4. And a control unit 80 for controlling the free length changing means 9 so as to decrease the free length FL toward the end of winding. According to the above configuration, bulge can be suppressed. Further, since the increase / decrease in the free length FL does not cause a change in the number N of winds, it is possible to easily realize winding while avoiding the dangerous wind number Nd while suppressing bulges. If the dangerous wind number Nd can be avoided, various problems such as the package end face being traversed, the contact roller 8 being vibrated, and the package 4 being unwound in a later process can be avoided. .

  In the above embodiment, the increase / decrease of the twill angle WA for suppressing the bulge is not adopted, but the increase / decrease of the twill angle WA may be used in combination. If the winding angle WA is constant and the winding number N always coincides with the dangerous winding number Nd at the end of winding, the winding angle WA is set at the end of winding as in the above confirmation test. It may be slightly reduced.

  In addition, as shown in FIG. 8, the free length FL increases from FL1 to FL2 and then increases or decreases to return to FL1, but does not necessarily need to be returned to FL1. However, in order to make the winding width of the package 4 constant regardless of the winding diameter D of the package 4 as shown in the right figure of FIG. 5B, the free length FL is increased from FL1 to FL2, and then again FL1 It is preferable to increase or decrease so as to return.

  In the above embodiment, the increase / decrease in the free length FL is set based on the winding diameter D, that is, the correspondence relationship FL = f (D). Instead, the increase / decrease in the free length FL is wound up. May be set on the basis of the time t, i.e., FL = f (t).

  Moreover, it is preferable to increase / decrease the winding diameter D2 of the package 4 corresponding to the turning point of the increase / decrease of the free length FL shown in FIG. 8 according to the winding condition of the yarn.

(Claim 5)
In the above embodiment, the elastic yarn 2 is wound around the bobbin 3. That is, when the yarn is the elastic yarn 2, a remarkable bulge is generated as described above because the winding force is large. If it is attempted to deal with this remarkable bulge only by increasing / decreasing the twill angle WA, the ribbon cannot be avoided, but if it is handled by increasing / decreasing the free length FL, the ribbon can be avoided. As described above, the technique for suppressing the bulge by increasing / decreasing the free length FL is particularly beneficial when the yarn is the elastic yarn 2.

  Next, a second embodiment of the present invention will be described with reference to FIGS. Here, this embodiment will be described mainly with respect to differences from the first embodiment, and overlapping descriptions will be omitted as appropriate.

  FIG. 13 is a graph similar to FIG. 8 and is a graph showing the contents of free length and twill angle control based on the winding diameter of the package in the second embodiment of the present invention. The horizontal axis indicates the winding diameter D of the package 4, and the vertical axis indicates the free length FL and the traverse angle WA. In the first embodiment, the correspondence relationship FL = f (D) between the winding diameter D of the package 4 and the free length FL as shown in FIG. 8 is stored in the ROM of the control unit 80 described above. He said. However, in the present embodiment, another correspondence relationship FL = g (D) between the winding diameter D of the package 4 and the free length FL as shown in FIG. Stored in the format. The difference between the correspondence relationship FL = f (D) according to the first embodiment and the correspondence relationship FL = g (D) according to the present embodiment is that the free length FL is between FL1 and FL2 in the former. In the latter case, the free length FL reciprocates between FL1 and FL3 (where FL1 <FL3 <FL2). In short, the correspondence relationship FL = g (D) according to the present embodiment has a smaller increase / decrease width of the free length FL than the correspondence relationship FL = f (D) according to the first embodiment.

  In the present embodiment, the correspondence relationship FL = g (D) between the winding diameter D of the package 4 and the free length FL as shown in FIG. 13 is stored in the ROM of the control unit 80 described above. In addition, as shown in FIG. 13, the correspondence relationship WA = h (D) between the winding diameter D of the package 4 and the twill angle WA is stored in a table format. Specifically, as shown in FIG. 13, this correspondence relationship WA = h (D) is the winding diameter in the beginning of winding of the package 4, that is, in the period from the winding diameter D to D2. As the D increases, the twill angle WA increases from WA1 to WA2, while the winding number N is the critical winding number at the end of winding of the package 4, that is, the winding diameter D changes from D2 to D3. As the winding diameter D increases, the traverse angle WA decreases from WA2 to WA1 so as not to coincide with Nd.

  Next, the operation of the winder 1 according to this embodiment will be described with reference to FIGS. 10, 13, and 14. FIG. 14 is a view similar to FIG. 9 and a flowchart according to the second embodiment of the present invention. In the present embodiment, as shown in FIG. 13, similarly to Patent Document 1, the increase / decrease of the twill angle WA for suppressing the bulge is adopted.

  When the winding of the elastic yarn 2 is started with the free length FL set to FL1 as shown in FIG. 10A, the control unit 80 first calculates the winding diameter D of the current package 4 ( S300).

  Next, the control unit 80 calculates an increment ΔD of the winding diameter D of the package 4 (S310).

  Next, the control unit 80 calculates a free length FL corresponding to the winding diameter D as shown in FIG. 13 (S320). Specifically, the control unit 80, based on the winding diameter D calculated in S300 and the correspondence relationship FL = g (D) (see FIG. 13) stored in the table format in the ROM, As shown in FIG. 13, a free length FL corresponding to the winding diameter D is calculated.

  Next, the control unit 80 calculates the change amount ΔFL of the free length FL (S330).

  Next, the control unit 80 calculates the movement amount ΔG of the slide box 16 (S340).

  Next, the control unit 80 moves the slide box 16 in the vertical direction based on the movement amount ΔG calculated in S340 (S350).

  Next, the control unit 80 calculates a twill angle WA corresponding to the winding diameter D as shown in FIG. 13 (S360). Specifically, the control unit 80, based on the winding diameter D calculated in the above S300 and the correspondence relationship WA = h (D) (see FIG. 13) stored in the table format in the ROM, As shown in FIG. 13, the twill angle WA corresponding to the winding diameter D is calculated.

  Next, the control unit 80 changes the current twill angle WA to the twill angle WA calculated in S360 (S370). Specifically, the control unit 80 acquires the rotation speed of the contact roller 8 based on the detection signal received from the rotation sensor 40. Then, the control unit 80 considers the rotational speed of the contact roller 8, that is, the peripheral speed of the package 4 so that the current traverse angle WA reaches the traverse angle WA calculated in S360 above. The drive is controlled to increase or decrease the rotational speed of the traverse cam 30.

  Next, the control unit 80 determines whether the winding diameter D of the package 4 calculated in S300 has reached the predetermined winding diameter Dmax (S380), and the winding diameter D still reaches the predetermined winding diameter Dmax. If it is determined that there is not (S380: NO), the process returns to S300. On the other hand, if it is determined that the winding diameter D has reached the predetermined winding diameter Dmax (S380: YES), the turret plate 6 is rotated to change the bobbin, and a new winding is started.

(Summary)
(Claim 2, Claim 4)
As described above, in the present embodiment, the winder 1 is further configured as follows. That is, the winder 1 further includes twill angle changing means that can change the twill angle WA. The control unit 80 controls the traverse angle changing means to increase the traverse angle WA at the start of winding of the package 4 and then decrease the traverse angle WA toward the end of winding. Thus, when suppressing the bulge, if the increase / decrease of the free length FL and the increase / decrease of the twill angle WA are used in combination, the increase / decrease width of the free length FL for suppressing the bulge can be reduced. 9 can be configured compactly.

  Further, when changing the winding width by changing the traverse width, and when changing the winding width by changing the free length FL and the traverse angle WA (that is, the traverse speed) with the traverse width being constant as in the above embodiment. In the latter, since the traverse width is constant, the latter can be smoothly wound even with a yarn type such as an elastic yarn, and the finish of the end face is also good.

  Although the preferred embodiments of the present invention have been described above, the above embodiments can be implemented with the following modifications.

  In the second embodiment, as shown in FIG. 13, both the turning point of the increase / decrease of the free length FL and the turning point of the increase / decrease of the twill angle WA are both when the winding diameter D of the package 4 becomes D2. did. However, instead of this, the turning point of the increase / decrease of the free length FL and the turning point of the increase / decrease of the twill angle WA may be shifted on the time axis.

  In the second embodiment, as shown in FIG. 13, the twill angle WA is set to WA <b> 1 at both the winding start time and end time. However, instead of setting the twill angle WA at the start time and the twill angle WA at the end time to the same value, different values may be used.

DESCRIPTION OF SYMBOLS 1 Winder 2 Elastic thread 4 Package 7 Traverse device 8 Contact roller 80 Control part

Claims (5)

A yarn winding machine for forming a package,
A contact roller that contacts the package during package formation;
A traverse device disposed upstream of the contact roller in the running direction of the yarn;
Free length changing means capable of changing the free length of the yarn between the contact roller and the traverse device during the formation of the package;
Control means for controlling the free length changing means to increase the free length at the beginning of winding of the package and then decrease the free length toward the end of winding;
A yarn winding machine characterized by comprising: A yarn winder according to claim 1,
A twill angle changing means capable of changing the twill angle is further provided.
The control means controls the traverse angle changing means to increase the traverse angle at the beginning of winding of the package and then decrease the traverse angle toward the end of winding.
A yarn winder characterized by that. A yarn winding method for forming a package using a contact roller that comes into contact with the package during package formation and a traverse device that is arranged upstream of the contact roller in the running direction of the yarn,
The free length of the yarn between the contact roller and the traverse device is increased at the beginning of winding of the package and then decreased toward the end of winding;
A yarn winding method characterized by that. The yarn winding method according to claim 3,
The twill angle is increased at the beginning of winding of the package and then decreased toward the end of winding.
A yarn winding method characterized by that. The yarn winding method according to claim 3 or 4,
The yarn is an elastic yarn,
A yarn winding method characterized by that.

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