JP2018131301A - Yarn winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the position of a dancer roll to be properly controlled, in a yarn winder, a plurality of bobbins (packages) of which are supported by a common spindle.SOLUTION: A yarn winder comprises: a plurality of traverse devices 19 for traversing a plurality of yarns Y; a plurality of dancer rolls 31 by which the plurality of yarns Y are each wound, and each of which is movable from a specified reference position to a relaxation side where the yarn Y is slackened or a tension side where the slack of the yarn Y is removed; a plurality of position detecting parts 34 for detecting the positions of the plurality of dancer rolls 31; and a control device 20 for controlling the positions of the dancer rolls 31 by which the yarns Y to be traversed by the traverse devices 19 are wound, by means of adjusting the traverse speed of at least any one of the traverse devices 19 corresponding to the output from the plurality of position detecting parts 34.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a yarn winding machine provided with a dancer roll for suppressing fluctuations in yarn tension.

  When winding a highly rigid yarn in a yarn winding machine, even if the yarn length changes due to, for example, a change in yarn production speed or traverse operation, the change in yarn length cannot be absorbed by the expansion and contraction of the yarn. Therefore, the tension of the yarn will fluctuate. In order to suppress such tension fluctuations, Patent Document 1 discloses providing a dancer roll. The dancer roll is wound with a thread. When the thread length is short, the dancer roll moves to the loose side to loosen the thread, and when the thread length is long, the dancer roll moves to the tension side to remove the slack of the thread. It is configured as follows. And it is possible to suppress a tension | tensile_strength fluctuation | variation by moving a dancer roll to the relaxation | loosening side or a tension | tensile_strength side suitably according to yarn length.

  Here, when the yarn length changes greatly, the dancer roll may reach the limit position on the relaxation side or the tension side, and the tension fluctuation may not be further suppressed. In such a case, control is performed to return the dancer roll to a predetermined reference position by adjusting the number of rotations of the spindle that supports the package, that is, by adjusting the yarn winding speed.

Japanese Patent Laid-Open No. 11-301930

  In the case of a yarn winding machine for a single spindle that forms only one package, the dancer roll can be returned to the reference position as appropriate by adjusting the number of rotations of the spindle as described above, and the tension fluctuation can be continuously maintained. Can be suppressed. However, in the case of a yarn winding machine for a plurality of spindles in which a plurality of packages are supported by a common spindle, there is a possibility that the control for adjusting the rotation speed of the spindle may fail. Hereinafter, this point will be described.

  In a yarn winding machine for a plurality of spindles, a plurality of dancer rolls are provided corresponding to a plurality of yarns, but the position of each dancer roll varies depending on the yarn length of each yarn, and the difference in position between dancer rolls increases. Sometimes. In such a case, if the number of rotations of the spindle is adjusted to return a certain dancer roll to the reference position, all dancer rolls supported by this spindle will move uniformly to the relaxation side or the tension side. As a result, even if the certain dancer roll can be returned to the reference position, another dancer roll may reach the limit position. Although Patent Document 1 describes a yarn winding machine for a plurality of spindles, no mention is made of such a problem.

  The present invention has been made in view of the above problems, and an object thereof is to appropriately control the position of a dancer roll in a yarn winding machine that supports a plurality of bobbins (packages) by a common spindle.

  The present invention is a yarn winding machine in which a plurality of bobbins are supported by a common spindle, and a plurality of yarns are wound around the plurality of bobbins by rotating the spindle to form a plurality of packages, A plurality of traverse devices for traversing a plurality of yarns, a plurality of yarns wound around each of the plurality of yarns, and a plurality of movable devices that can be moved to a relaxing side that loosens the yarns from a predetermined reference position and a tension side that removes slackness of the yarns A traverse of at least one of the plurality of traverse devices according to outputs from the dancer roll, a plurality of position detection units that detect positions of the plurality of dancer rolls, and the plurality of position detection units The dancer roll around which the yarn traversed by the traverse device is wound by adjusting the speed A control device for controlling the position, characterized in that it comprises a.

  In the present invention, traverse devices are individually provided for a plurality of yarns. Then, by adjusting the traverse speed of any of the traverse devices, the position of the dancer roll around which the yarn traversed by the traverse device is wound can be controlled. Thus, by controlling the position of the dancer roll by adjusting the traverse speed, the position of each dancer roll can be individually controlled, and the position of each dancer roll can be appropriately controlled.

  In the present invention, the control device may include a yarn wound around the two dancer rolls when a difference in position between any two dancer rolls of the plurality of dancer rolls exceeds a predetermined threshold. It is preferable to execute position difference elimination control that adjusts the traverse speed of at least one of the two traverse devices that traverse the position to suppress the difference between the positions of the two dancer rolls within the threshold value.

  By executing such position difference elimination control, when the position difference between the dancer rolls is large, the difference can be reduced.

  In the present invention, the control device traverses the traverse speed of the traverse device that traverses the yarn wound around the dancer roll on the more relaxed side of the two dancer rolls in the positional difference elimination control. It is good to lower.

  By doing so, the dancer roll on the more relaxed side moves to the tension side, and the difference in position between the dancer rolls can be reduced. Further, when the traverse speed is increased, there is a possibility that the thread slips. However, as described above, by controlling the dancer roll position by lowering the traverse speed, the thread slip can be avoided.

  In the present invention, the control device may execute the position difference elimination control only within a period during which the traverse device reciprocates the yarn once in the traverse direction.

  If position difference elimination control for changing the traverse speed is performed for a long period of time, the shape of the package may be destroyed. Therefore, as described above, the package quality can be favorably maintained by performing the position difference elimination control only for a short period of time.

  In the present invention, the two spindles may be mutually connected between a winding position for winding the plurality of yarns around the plurality of bobbins and a collection position for collecting the plurality of packages. A switching device that is switchably supported, and a plurality of cuttings that cut the plurality of yarns connected to the plurality of packages supported by the spindle that is switched from the winding position to the collection position by the switching device. And the control device, whether or not the difference between the positions of the two dancer rolls exceeds the threshold immediately before switching the positions of the two spindles by the switching device, The position difference elimination control may be executed.

  If the position difference between the dancer rolls is large when the yarn is cut, the timing at which the plurality of yarns are cut may vary, or some of the yarns may not be cut. Thus, as described above, the position difference elimination control is forcibly executed immediately before the spindle position is switched, so that a plurality of yarns can be cut simultaneously.

  Further, in the present invention, the control device may determine whether the position of the two dancer rolls exceeds the threshold immediately after cutting the plurality of yarns by the plurality of cutting means, regardless of whether or not the position exceeds the threshold. It is preferable to execute difference elimination control.

  In the present invention, the position of the dancer roll can be controlled by adjusting the traverse speed. However, in order to improve the quality of the package, the traverse speed is preferably as constant as possible. Therefore, as described above, immediately after the yarn is cut, that is, at the start of winding on a new bobbin, the position difference canceling control is forcibly controlled to suppress the need to change the traverse speed during winding. can do.

  In the present invention, the control device may be capable of changing a traverse width of the plurality of traverse devices.

  As will be described in detail later, when the traverse speed is changed, the actual winding width may change. Thus, as described above, if the traverse width of the traverse device is configured to be changeable, the winding width can be maintained constant by adjusting the traverse width according to the change in the traverse speed.

  In the present invention, the control device may narrow the traverse width of the traverse device when lowering the traverse speed of the traverse device.

  As described above, by controlling the position of the dancer roll by lowering the traverse speed, the yarn can be prevented from slipping. However, if the traverse speed is lowered, the winding width becomes wider and the traverse may occur. is there. Therefore, when the traverse speed is lowered, the traverse width is narrowed at the same time, so that the winding width can be kept constant while avoiding yarn slippage.

  In the present invention, the control device may execute a winding speed control for moving the positions of the plurality of dancer rolls by adjusting the rotational speed of the spindle.

  By executing such winding speed control, the position of the dancer roll can be controlled not only by adjusting the traverse speed but also by the number of rotations of the spindle.

  In the present invention, the control device may adjust the rotation speed of the spindle so that any one of the plurality of dancer rolls is moved to the reference position in the winding speed control. .

  In this way, if a dancer roll is moved to a reference position by winding speed control, position difference elimination control is executed on the other dancer rolls so as to reduce the difference in position with this dancer roll. All dancer rolls can be kept in the reference position.

  In the present invention, the control device adjusts the number of revolutions of the spindle so that the dancer roll that is closest to the tension side among the plurality of dancer rolls is moved to the reference position in the winding speed control. Good.

  If the winding speed control is executed so that the dancer roll on the most tension side is moved to the reference position in this way, the other dancer rolls are located on the relaxation side with respect to the reference position. Therefore, when performing position difference elimination control for other dancer rolls so as to reduce the difference in position with this dancer roll, the traverse speed may be lowered. Can be avoided.

It is a schematic block diagram of the yarn winding machine which concerns on this embodiment. It is a schematic diagram which shows the position switching operation | movement of a spindle. It is a flowchart which shows the position control of a dancer roll. It is a flowchart which shows winding speed control. It is a flowchart which shows position difference cancellation control. It is a schematic diagram which shows the change of the winding width | variety at the time of changing traverse speed. It is a flowchart which shows the winding speed control in other embodiment. It is a flowchart which shows the position difference elimination control in other embodiment.

(Configuration of yarn winding machine)
Hereinafter, an example of an embodiment of a yarn winding machine according to the present invention will be described. FIG. 1 is a schematic configuration diagram of a yarn winding machine according to the present embodiment. The yarn winding machine 1 winds a plurality (two in this embodiment) of yarns Y produced in the yarn production apparatus 100 onto a plurality of (two in this embodiment) bobbins B, and a plurality of (this embodiment). Then, two packages P are formed.

  As shown in FIG. 1, the yarn winding machine 1 includes a first roller 11, a dancer roll mechanism 12, a second roller 13, a fulcrum roller 14, and a winding device 15 in order from the upstream side in the yarn traveling direction. . Among these, the 1st roller 11, the dancer roll mechanism 12, the 2nd roller 13, and the fulcrum roller 14 are arrange | positioned at each of the thread path of the two thread | yarns Y, and the winding device 15 has 2 Common to the yarn Y.

  The first roller 11 and the second roller 13 are fixedly arranged. A dancer roll 31 of the dancer roll mechanism 12 is disposed between the first roller 11 and the second roller 13. The yarn Y is wound on the upper part of the first roller 11 and the second roller 13 and is also wound on the lower part of the dancer roll 31, whereby the second roller 13 passes from the first roller 11 through the dancer roll 31. The yarn path leading to is formed in a V shape. The dancer roll mechanism 12 will be described in detail later. The fulcrum roller 14 is fixedly disposed and serves as a fulcrum when the yarn Y is traversed by the winding device 15. Note that the fulcrum roller 14 can be omitted by using the second roller 13 also as the fulcrum roller 14.

  The winding device 15 includes a machine base 16, a turret 17, a spindle 18, a traverse device 19, a control device 20, and the like. A disk-shaped turret 17 that is rotationally driven by a turret motor 21 is attached to the machine base 16. Two long cylindrical spindles 18 that are rotationally driven by a spindle motor 22 are cantilevered on the turret 17. Each spindle 18 is mounted with two bobbins B aligned in the axial direction. The operations of the turret motor 21 and the spindle motor 22 are controlled by the control device 20.

  By rotating the turret 17 around a central axis C parallel to the axial direction of the spindle 18 by the turret motor 21, the positions of the two spindles 18 are mutually changed between the winding position L1 and the collection position L2. Can be switched. At the time of winding the yarn Y, the yarn Y is wound around the bobbin B attached to the spindle 18 at the winding position L1, and the package P is formed. When the package P is fully wound, the positions of the two spindles 18 are switched to each other, and the spindle 18 that supports the package P moves to the collection position L2, and then the package P is collected.

  In the vicinity of the position where the bobbin B of each spindle 18 is mounted, a ring-shaped thread gripping portion 18a is externally fitted so as to be movable in the axial direction. Then, the thread gripping part 18a is separated from the bobbin B so that a gap is formed between the thread gripping part 18a and the bobbin B, and the thread gripping part 18a is adjacent to the bobbin B at the moment when the thread Y enters the clearance. By moving the thread Y, the thread Y can be gripped by sandwiching the thread Y between the thread gripping portion 18a and the bobbin B. Further, a cutter 23 for cutting the yarn Y connected to the fully packaged package P is provided in the vicinity of each yarn gripping portion 18a. The operations of the yarn gripping portion 18a and the cutter 23 are controlled by the control device 20.

  Here, the operation when starting the winding of the yarn Y onto the bobbin B attached to the spindle 18 newly at the winding position L1 by switching the positions of the two spindles 18 will be described. FIG. 2 is a schematic diagram showing the position switching operation of the spindle 18, and is a view of the two spindles 18 as viewed from the left side of FIG.

  As shown in FIG. 2 (a), when the package P supported by the spindle 18 at the winding position L1 is fully wound, as shown in FIG. 2 (b), the turret 17 is moved counterclockwise in FIG. The position of the two spindles 18 is switched by rotating 180 degrees. At this time, the yarn Y is still connected to the package P, and this yarn Y comes into contact with the outer peripheral surface of the bobbin B attached to the spindle 18 that has newly arrived at the winding position L1. Then, almost simultaneously with gripping the yarn Y by operating the yarn gripping portion 18a provided on the spindle 18 at the winding position L1, the cutter 23 removes the yarn Y between the gripping portion of the yarn Y and the package P. Disconnect. Then, as shown in FIG. 2C, the yarn Y is transferred from the package P at the collection position L2 to the bobbin B at the winding position L1, and winding of the yarn Y onto the new bobbin B is started.

  Returning to FIG. 1, the traverse device 19 is attached to the machine base 16 via a support member (not shown). The traverse device 19 is individually provided for each of the two yarns Y, and each traverse device 19 is independently controlled by the control device 20. A traverse guide 19 a provided in the traverse device 19 is configured to be capable of reciprocating in the axial direction (traverse direction) of the spindle 18. With the yarn Y hung on the traverse guide 19a, the traverse guide 19a reciprocates in the traverse direction, whereby the yarn Y is wound around the corresponding bobbin B while being traversed around the fulcrum roller 14. In FIG. 1, the traverse device 19 is configured by a combination of a pulley and a belt. However, the configuration of the traverse device 19 is not limited to this, and for example, a device using a ball screw may be used.

  Here, the type of the yarn Y wound by the yarn winding machine 1 is assumed to be a high-rigidity yarn having an elastic modulus of 3 GPa or more made of, for example, carbon fiber or aramid fiber. In the case of a synthetic fiber yarn made of general nylon, since the rigidity is relatively low, even if tension variation occurs in the yarn, the tension variation can be absorbed by the yarn itself expanding and contracting. On the other hand, in the high-rigidity yarn as described above, the tension hardly fluctuates because the yarn hardly expands or contracts. Therefore, the yarn winding machine 1 is provided with the dancer roll mechanism 12 so that the tension variation of the yarn Y can be suppressed even when the yarn Y is a high-rigidity yarn. Further, the yarn winding machine 1 has a traverse speed of 35 m / min or less and a winding speed of 100 m / min or less, and is configured to wind the yarn Y at a relatively low speed.

  The dancer roll mechanism 12 includes a dancer roll 31, a dancer arm 32, a shaft 33, and a position sensor 34. As described above, the dancer roll 31 is disposed between the first roller 11 and the second roller 13 in the yarn traveling direction, and the yarn reaches from the first roller 11 through the dancer roll 31 to the second roller 13. The road is V-shaped. The dancer roll 31 is rotatably supported at the tip of the dancer arm 32. The base end portion of the dancer arm 32 is swingably attached to the shaft 33, whereby the dancer roll 31 is movable in the vertical direction.

  The dancer roll mechanism 12 is adjusted so that the dancer roll 31 is basically located at a predetermined reference position (position indicated by a solid line in FIG. 1). When the tension of the yarn Y varies due to a change in the length of the yarn Y or the like, the tension variation can be suppressed by moving the dancer roll 31 in the vertical direction from the reference position. Specifically, when the length of the yarn Y between the yarn production device 100 and the winding device 15 becomes shorter, the dancer roll 31 moves upward so as to loosen the yarn Y (corresponding to the “relaxation side” of the present invention). The tension fluctuation of the yarn Y can be suppressed by moving to. On the other hand, when the length of the yarn Y between the yarn production device 100 and the winding device 15 is increased, the dancer roll 31 is on the lower side (corresponding to the “tension side” of the present invention) to remove the slackness of the yarn Y. The tension fluctuation of the yarn Y can be suppressed by moving to. However, there is a limit to the movement of the dancer roll 31 in the vertical direction. The dancer roll 31 has an upper limit position (a position indicated by a one-dot chain line in FIG. 1) and a lower limit position (a position indicated by a two-dot chain line in FIG. 1). Can only move between.

  The position sensor 34 is a sensor that detects the swing angle of the dancer arm 32, and can thereby grasp the position of the dancer roll 31. The control device 20 controls the rotational speed of the spindle 18, the traverse speed and the traverse width of the traverse device 19 based on the output from the position sensor 34.

(Dancer roll position control)
Conventionally, when the length of the yarn Y between the yarn production device 100 and the winding device 15 changes greatly and the dancer roll 31 reaches the upper limit position or the lower limit position, the rotational speed of the spindle 18 is adjusted. Thus, the winding speed is adjusted to return the dancer roll 31 to the reference position. However, when a plurality of bobbins B are supported by the common spindle 18 as in the present embodiment, the dancer roll by adjusting the number of rotations of the spindle 18 increases as the position difference between the dancer rolls 31 increases. There is a possibility that position control 31 may fail.

  This is because, when the two bobbins B are supported by the common spindle 18 as in this embodiment, if the rotation speed of the spindle 18 is adjusted to return one dancer roll 31 to the reference position, at the same time, The dancer roll 31 will also move. As a result, even if one dancer roll 31 can be returned to the reference position, the other dancer roll 31 may reach the upper limit position or the lower limit position. That is, in the adjustment based on the rotation speed of the spindle 18, all the dancer rolls 31 are moved uniformly, so that there is a limit to the position control of each dancer roll 31. Therefore, in the present embodiment, in addition to the “winding speed control” for adjusting the rotation speed of the spindle 18, the “positional difference elimination control” for individually adjusting the traverse speed of each traverse device 19 is executed. It is possible to control with

  An example of a factor that increases the difference between the positions of the two dancer rolls 31 is a difference in the production speed of the two yarns Y. For example, when a yarn Y made of carbon fiber is produced by the yarn production device 100, the yarn Y is generated by firing a precursor as a raw material. A difference in production speed between the two yarns Y may increase due to a difference in grip force. In such a case, the position difference elimination control of this embodiment is particularly effective.

  FIG. 3 is a flowchart showing position control of the dancer roll 31, FIG. 4 is a flowchart showing winding speed control, and FIG. 5 is a flowchart showing position difference elimination control. While winding the yarn Y, the winding speed control (step S10) and the position difference elimination control (step S11) are executed at an appropriate timing (for example, every predetermined time). In the present embodiment, the position difference elimination control is executed following the winding speed control. However, both controls may be executed simultaneously. In the following description, with respect to the position of the dancer roll 31, the upper side (relaxation side) is defined as the positive direction of coordinates, and the lower side (tensile side) is defined as the negative direction of coordinates.

  The winding speed control will be described with reference to FIG. In the winding speed control of the present embodiment, the rotational speed of the spindle 18 is adjusted so that the dancer roll 31 positioned on the lower side is returned to the reference position PO. Hereinafter, if necessary, an element relating to one yarn Y is distinguished by attaching A to the end, and an element relating to the other yarn Y is appended with B at the end.

  First, the control device 20 acquires the positions PA and PB of the dancer rolls 31A and 31B detected by the position sensors 34A and 34B, respectively (step S20). Then, it is determined whether or not the position PA of the dancer roll 31A is below the position PB of the dancer roll 31B (step S21). As a result, when the position PA of the dancer roll 31A is below the position PB of the dancer roll 31B (YES in step S21), it is subsequently determined whether the position PA of the dancer roll 31A is above the reference position PO. Judgment is made (step S22). As a result, when the position PA of the dancer roll 31A is above the reference position PO (YES in step S22), the rotational speed of the spindle 18 is decreased so as to lower the position PA of the dancer roll 31A to the reference position PO (step S23). ), The winding speed control is terminated.

  On the other hand, when the position PA of the dancer roll 31A is not above the reference position PO (NO in step S22), it is subsequently determined whether or not the position PA of the dancer roll 31A is below the reference position PO (step S24). . As a result, when the position PA of the dancer roll 31A is below the reference position PO (YES in step S24), the rotational speed of the spindle 18 is increased so as to raise the position PA of the dancer roll 31A to the reference position PO (step S25), the winding speed control is terminated. On the other hand, if the position PA of the dancer roll 31A is not below the reference position PO (NO in step S24), it means that the position PA of the dancer roll 31A is equal to the reference position PO. Then, the winding speed control is terminated.

  If NO is determined in step S21, it is subsequently determined whether or not the position PB of the dancer roll 31B is above the reference position PO (step S26). As a result, when the position PB of the dancer roll 31B is above the reference position PO (YES in step S26), the rotational speed of the spindle 18 is decreased so as to lower the position PB of the dancer roll 31B to the reference position PO (step S27). ), The winding speed control is terminated.

  On the other hand, when the position PB of the dancer roll 31B is not above the reference position PO (NO in step S26), it is subsequently determined whether the position PB of the dancer roll 31B is below the reference position PO (step S28). . As a result, when the position PB of the dancer roll 31B is below the reference position PO (YES in step S28), the rotational speed of the spindle 18 is increased so as to raise the position PB of the dancer roll 31B to the reference position PO (step S29), the winding speed control is terminated. If the position PB of the dancer roll 31B is not below the reference position PO (NO in step S28), it means that the position PB of the dancer roll 31B is equal to the reference position PO, so the rotation speed of the spindle 18 is changed. Then, the winding speed control is terminated.

  Next, the position difference elimination control will be described with reference to FIG. In the position difference elimination control of this embodiment, when the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B is large, the dancer 31 is moved so that only the dancer roll 31 on the upper side is moved to the reference position PO. The traverse speed of the traverse device 19 that traverses the yarn Y wound around the roll 31 is adjusted.

  First, the control device 20 acquires the positions PA and PB of the dancer rolls 31A and 31B detected by the position sensors 34A and 34B, respectively (step S30). Then, it is determined whether or not the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B is equal to or less than a predetermined threshold value PX (step S31). As a result, if the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B is equal to or less than the threshold value PX (YES in step S31), the traverse speed of any of the traverse devices 19A and 19B is not changed. Terminate control.

  On the other hand, if the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B exceeds the threshold PX (NO in step S31), then the position PA of the dancer roll 31A is the position PB of the dancer roll 31B. It is determined whether or not the lower side (step S32). As a result, when the position PA of the dancer roll 31A is below the position PB of the dancer roll 31B (YES in step S32), the traverse device 19B is configured to lower the position PB of the dancer roll 31B on the upper side to the reference position PO. The traverse speed is reduced for a predetermined period (step S33). Thereafter, the traverse speed of the traverse device 19B is returned to the original (step S34), and the position difference elimination control is ended.

  If NO is determined in step S32, the traverse speed of the traverse device 19A is decreased for a predetermined period so as to lower the position PA of the dancer roll 31A on the upper side to the reference position PO (step S35). Thereafter, the traverse speed of the traverse device 19A is returned to the original (step S36), and the position difference elimination control is ended. In addition, although the said predetermined period which adjusts traverse speed in step S33, S35 can be set suitably, in this embodiment, it is set as the short period during which the traverse guide 19a reciprocates once in the traverse direction. .

  As described above, in the position control of the dancer roll 31 according to the present embodiment, first, the winding speed control is executed so that the lower one of the dancer rolls 31A and 31B returns to the reference position PO. Both of the dancer rolls 31A and 31B move uniformly upward or downward. In the subsequent position difference elimination control, when the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B is large, only the dancer roll 31 located on the upper side is moved to the reference position PO. The difference in position with the other dancer roll 31 already moved to the reference position PO can be reduced by the winding speed control. That is, both the dancer rolls 31A and 31B can be maintained at the reference position PO as much as possible by executing the winding speed control in step S10 and subsequently executing the position difference elimination control in step S11.

  Returning to FIG. 3, after executing Steps S10 and S11, the control device 20 determines whether or not the formation of the package P is completed, that is, whether or not the package P is fully wound from a sensor (not shown). A determination is made based on the output or the like (step S12). When the formation of the package P is not completed (NO in step S12), the winding speed control and the position difference elimination control are repeated.

  On the other hand, when the formation of the package P is completed (YES in step S12), forced position difference elimination control is executed (step S13). This forced position difference cancellation control is position difference cancellation control that is forcibly executed regardless of whether or not the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B exceeds the threshold value PX. Specifically, in the flowchart of FIG. 5, this means control in which step S31 is omitted and step S32 is executed after step S30. Immediately after executing the forced position difference cancellation control, the position of the two spindles 18 is switched between each other by rotating the turret 17, and the yarn Y is gripped by the new bobbin B by the thread gripping portion 18 a and at the same time by the cutter 23. The yarn Y connected to the package P is cut (step S14). As a result, winding of the yarn Y around the new bobbin B is started. Immediately thereafter, forced position difference elimination control is executed again (step S15), and a series of operations are repeated from step S10.

(effect)
In this embodiment, the position of the dancer roll 31 around which the yarn Y traversed by the traverse device is wound can be controlled by adjusting the traverse speed of any of the traverse devices 19A and 19B. Thus, by controlling the position of the dancer roll 31 by adjusting the traverse speed, the positions PA and PB of the dancer rolls 31A and 31B can be individually controlled, and the positions PA and PB of the dancer rolls 31A and 31B are appropriately controlled. can do.

  In the present embodiment, the control device 20 is wound around the two dancer rolls 31A and 31B when the difference between the positions PA and PB of the two dancer rolls 31A and 31B exceeds a predetermined threshold PX. Position difference elimination control is performed by adjusting the traversing speed of at least one of the two traversing devices 19A and 19B for traversing the yarn Y so that the difference between the positions PA and PB of the two dancer rolls 31A and 31B is within the threshold value PX. Run. By executing such position difference elimination control, when the difference between the positions PA and PB of the dancer rolls 31A and 31B is large, the difference can be reduced.

  In the present embodiment, the control device 20 traverses the yarn Y wound around the dancer roll 31 on the upper side (relaxation side) of the two dancer rolls 31A and 31B in the position difference elimination control. The traverse speed of the traverse device 19 is lowered. In this way, the dancer roll 31 on the upper side moves downward (tension side), and the difference between the positions PA and PB of the dancer rolls 31A and 31B can be reduced. Further, when the traverse speed is increased, the yarn Y may slip, but as described above, the yarn Y can be prevented from slipping by controlling the position of the dancer roll 31 by decreasing the traverse speed. .

  In the present embodiment, the control device 20 executes the position difference elimination control only within a period during which the traverse device 19 makes the yarn Y reciprocate once in the traverse direction. If position difference elimination control for changing the traverse speed is performed for a long period of time, the shape of the package P may be destroyed. Therefore, as described above, the quality of the package P can be favorably maintained by executing the position difference elimination control only for a short period.

  In the present embodiment, the control device 20 determines that the difference between the positions PA and PB of the two dancer rolls 31A and 31B exceeds the threshold value PX immediately before the positions of the two spindles 18 are switched by the turret 17 (switching device). Regardless of whether or not it is, position difference elimination control is executed (forced position difference elimination control is executed). If the difference between the positions PA and PB of the dancer rolls 31A and 31B is large when the yarn Y is cut, the timing at which the plurality of yarns Y are cut may be shifted or one of the yarns Y may not be cut. Therefore, as described above, by forcibly executing the position difference elimination control immediately before the position of the spindle 18 is switched, a plurality of yarns Y can be cut simultaneously.

  In the present embodiment, the control device 20 immediately after the cutting of the plurality of yarns Y by the plurality of cutters 23 (cutting means), the difference between the positions PA and PB of the two dancer rolls 31A and 31B exceeds the threshold value PX. Regardless of whether it is present or not, position difference elimination control is executed (forced position difference elimination control is executed). In this embodiment, it is possible to control the positions PA and PB of the dancer rolls 31A and 31B by adjusting the traverse speed, but in order to improve the quality of the package P, the traverse speed is as constant as possible. It is preferable. Therefore, as described above, it is necessary to change the traverse speed during winding by forcibly performing position difference elimination control immediately after cutting the yarn Y, that is, at the start of winding on the new bobbin B. Can be suppressed.

  In the present embodiment, the control device 20 is configured to change the traverse width of the plurality of traverse devices 19. This advantage will be described with reference to FIG. FIG. 6 is a schematic diagram showing a change in the winding width when the traverse speed is changed, and shows a state where the package P is developed on the paper surface. During normal times when the position difference elimination control is not executed, the traverse guide 19a reciprocates at the traverse speed V1 and the traverse width W1, and draws a locus S1 (illustrated by a one-dot chain line). The yarn Y between the traverse guide 19a and the outer peripheral surface of the package P has a portion where the yarn Y does not follow the traverse guide 19a when the traverse guide 19a is reversed, so-called free length, so when the traverse guide 19a is reversed, As shown by a thick solid line in FIG. 6, the yarn Y is wound so as to be folded back inside the trajectory of the traverse guide 19a. That is, the actual winding width X1 is smaller than the traverse width W1. In anticipation of such a phenomenon, the traverse speed V1 and the traverse width W1 are determined in advance so that the winding width X1 becomes a desired value.

  Here, in the position difference elimination control, if the traverse speed is lowered to V2 while keeping the traverse width W1, the trajectory of the traverse guide 19a becomes S2 (illustrated by a two-dot chain line). By lowering the traverse speed, the yarn Y can follow the traverse guide 19a when the traverse guide 19a is reversed, and the winding width X2 at this time becomes wider than the normal winding width X1. On the other hand, although illustration is omitted, when the traverse speed is increased, the winding width becomes narrower than the normal winding width X1. In this way, when the traverse speed is changed, the actual winding width changes. Therefore, if the traverse width of the traverse device 19 is configured to be changeable as described above, the traverse width is changed according to the change in the traverse speed. By adjusting, the winding width can be kept constant.

  For example, in the present embodiment, the control device 20 may narrow the traverse width of the traverse device 19 when the traverse speed of the traverse device 19 is decreased. As described above, by controlling the position of the dancer roll 31 by lowering the traverse speed, the yarn Y can be prevented from slipping. However, if the traverse speed is lowered, the actual winding width becomes wider and the traversing occurs. May occur. Therefore, when lowering the traverse speed, the traverse width is made narrower than W1 at the same time, so that the winding width can be kept constant at X1 while avoiding slippage of the yarn Y.

  Moreover, in this embodiment, the control apparatus 20 is comprised so that the winding speed control which moves the position of several dancer roll 31A, 31B by adjusting the rotation speed of the spindle 18 may be performed. By executing such winding speed control, the positions of the dancer rolls 31A and 31B can be controlled not only by adjusting the traverse speed but also by the rotational speed of the spindle 18.

  In the present embodiment, the control device 20 adjusts the rotation speed of the spindle 18 so as to move any one of the dancer rolls 31A and 31B to the reference position PO in the winding speed control. To do. Thus, if the dancer roll 31A (or 31B) is moved to the reference position PO by the winding speed control, the difference in position PA (or PB) from the dancer roll 31A (or 31B) is reduced. By executing the position difference elimination control for the other dancer roll 31B (or 31A), all the dancer rolls 31A and 31B can be maintained at the reference position PO.

  In the present embodiment, the control device 20 controls the rotation speed of the spindle 18 so that the lowermost dancer roll among the plurality of dancer rolls 31A and 31B is moved to the reference position PO in the winding speed control. adjust. If the winding speed control is performed so that the lowermost dancer roll 31A (or 31B) is moved to the reference position PO in this way, the other dancer roll 31B (or 31A) is positioned above the reference position PO. Will do. Therefore, when the position difference elimination control is executed for the other dancer roll 31B (or 31A) so as to reduce the difference in the position PA (or PB) from the dancer roll 31A (or 31B), the traverse speed Therefore, the slippage of the yarn Y can be avoided as described above.

(Other embodiments)
In the above embodiment, an example of the position control of the dancer roll 31 has been described, but the specific content of the control is not limited to that shown in the above embodiment. For example, in the winding speed control, one predetermined dancer roll 31 may be moved to the reference position PO, or the spindle 18 so that the average position of the plurality of dancer rolls 31 becomes the reference position PO. The number of rotations may be adjusted. In the position difference elimination control, it is possible to appropriately change which dancer roll 31 is moved, and to move a plurality of dancer rolls 31 at the same time (change the traverse speeds of the plurality of traverse devices 19 simultaneously). May be.

  Winding speed control and position difference elimination control in another embodiment will be described with reference to FIGS. In the winding speed control of the present embodiment, the rotational speed of the spindle 18 is adjusted so that the dancer roll 31A is returned to the reference position PO. First, the control device 20 acquires the position PA of the dancer roll 31A detected by the position sensor 34A (step S40). Then, it is determined whether or not the position PA of the dancer roll 31A is above the reference position PO (step S41). As a result, if the position PA of the dancer roll 31A is above the reference position PO (YES in step S41), the rotational speed of the spindle 18 is decreased so as to lower the position PA of the dancer roll 31A to the reference position PO ( Step S43), the winding speed control is terminated. If NO is determined in step S41, it is subsequently determined whether or not the position PA of the dancer roll 31A is below the reference position PO (step S43). As a result, if the position PA of the dancer roll 31A is below the reference position PO (YES in step S43), the rotational speed of the spindle 18 is increased so as to raise the position PA of the dancer roll 31A to the reference position PO. (Step S44), the winding speed control is terminated. If NO is determined in step S41, it means that the position PA of the dancer roll 31A is equal to the reference position PO, and therefore the winding speed control is terminated without changing the rotational speed of the spindle 18.

  Further, in the position difference elimination control of the present embodiment, when the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B is large, the traverse of the traverse device 19B is performed so as to move the dancer roll 31B to the reference position PO. The speed is adjusted. First, the control device 20 acquires the positions PA and PB of the dancer rolls 31A and 31B detected by the position sensors 34A and 34B, respectively (step S50). Then, it is determined whether or not the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B is equal to or less than a predetermined threshold PX (step S51). As a result, if the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B is equal to or less than the threshold value PX (YES in step S51), the traverse speed of any of the traverse devices 19A and 19B is not changed. Terminate control.

  On the other hand, when the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B exceeds the threshold PX (NO in step S51), it is determined whether or not the position PB of the dancer roll 31B is above the reference position PO. Judgment is made (step S52). As a result, when the position PB of the dancer roll 31B is above the reference position PO (YES in step S52), the traverse speed of the traverse device 19B is set to a predetermined period so as to lower the position PB of the dancer roll 31B to the reference position PO. (Step S53). Thereafter, the traverse speed of the traverse device 19B is restored (step S54), and the position difference elimination control is terminated. If NO is determined in step S52, the traverse speed of the traverse device 19B is decreased for a predetermined period so as to raise the position PB of the dancer roll 31B to the reference position PO (step S55). Thereafter, the traverse speed of the traverse device 19B is restored (step S56), and the position difference elimination control is terminated.

  Thus, according to the position control of the dancer roll 31 of the present embodiment, in the winding speed control, the dancer roll 31A is controlled to move to the reference position PO, and in the position difference elimination control, the dancer roll 31B is the reference. Control is made to move to position PO. That is, since the dancer roll which is the target of position control in each control is fixed, the control becomes easy.

  Further, the yarn winding machine 1 of the above embodiment is configured to support the two bobbins B (package P) by the common spindle 18, but the number of bobbins B (package P) supported by one spindle 18 is the same. May be three or more.

  In the above embodiment, the reference position PO of the dancer roll 31 is defined as a predetermined position. However, the reference position PO may be defined as a predetermined range.

1: Yarn winding machine 17: Turret (switching device)
18: Spindle 19: Traverse device 20: Control device 23: Cutter (cutting means)
34: Position sensor (position detection unit)
Y: Yarn B: Bobbin P: Package L1: Winding position L2: Collection position

Winding speed control and position difference elimination control in another embodiment will be described with reference to FIGS. In the winding speed control of the present embodiment, the rotational speed of the spindle 18 is adjusted so that the dancer roll 31A is returned to the reference position PO. First, the control device 20 acquires the position PA of the dancer roll 31A detected by the position sensor 34A (step S40). Then, it is determined whether or not the position PA of the dancer roll 31A is above the reference position PO (step S41). As a result, if the position PA of the dancer roll 31A is above the reference position PO (YES in step S41), the rotational speed of the spindle 18 is decreased so as to lower the position PA of the dancer roll 31A to the reference position PO ( step S 42), and terminates the winding speed control. If NO is determined in step S41, it is subsequently determined whether or not the position PA of the dancer roll 31A is below the reference position PO (step S43). As a result, if the position PA of the dancer roll 31A is below the reference position PO (YES in step S43), the rotational speed of the spindle 18 is increased so as to raise the position PA of the dancer roll 31A to the reference position PO. (Step S44), the winding speed control is terminated. If it is determined that NO in step S 43, since the position PA of the dancer roll 31A is that equal to the reference position PO, without changing the rotational speed of the spindle 18, and terminates the winding speed control.

On the other hand, when the difference between the position PA of the dancer roll 31A and the position PB of the dancer roll 31B exceeds the threshold PX (NO in step S51), it is determined whether or not the position PB of the dancer roll 31B is above the reference position PO. Judgment is made (step S52). As a result, when the position PB of the dancer roll 31B is above the reference position PO (YES in step S52), the traverse speed of the traverse device 19B is set to a predetermined period so as to lower the position PB of the dancer roll 31B to the reference position PO. (Step S53). Thereafter, the traverse speed of the traverse device 19B is restored (step S54), and the position difference elimination control is terminated. If it is determined NO in step S52, so as to raise the position PB of the dancer roll 31B to the reference position PO, increase the traverse speed of the traverse device 19B by a predetermined time period (step S55). Thereafter, the traverse speed of the traverse device 19B is restored (step S56), and the position difference elimination control is terminated.

Claims (11)

A plurality of bobbins are supported by a common spindle, and a yarn winding machine that forms a plurality of packages by winding a plurality of yarns around the plurality of bobbins by rotating the spindle,
A plurality of traverse devices for traversing the plurality of yarns;
A plurality of dancer rolls that are respectively wound around the plurality of yarns and are movable to a relaxing side that loosens the yarn from a predetermined reference position and a tension side that removes slackness of the yarn;
A plurality of position detectors for detecting positions of the plurality of dancer rolls;
The yarn traversed by the traverse device is wound by adjusting the traverse speed of at least one of the plurality of traverse devices in accordance with outputs from the plurality of position detection units. A control device for controlling the position of the dancer roll;
A yarn winding machine comprising:   The control device traverses the two yarns wound around the two dancer rolls when the difference between the positions of any two dancer rolls of the plurality of dancer rolls exceeds a predetermined threshold. 2. The yarn winding according to claim 1, wherein position difference elimination control is performed to suppress a difference in position between the two dancer rolls within the threshold by adjusting a traverse speed of at least one of the traverse devices. Machine.   In the positional difference elimination control, the control device lowers a traverse speed of the traverse device that traverses a yarn wound around a dancer roll on the more relaxed side of the two dancer rolls. The yarn winding machine according to claim 2.   The yarn winding machine according to claim 2 or 3, wherein the control device executes the position difference elimination control only within a period during which the traverse device makes the yarn reciprocate once in the traverse direction. Switching that supports the two spindles so as to be switchable between a winding position for winding the plurality of yarns around the plurality of bobbins and a collection position for collecting the plurality of packages. Equipment,
A plurality of cutting means for cutting the plurality of yarns connected to the plurality of packages supported by the spindle that is switched from the winding position to the collection position by the switching device;
Further comprising
The control device executes the position difference elimination control immediately before switching the positions of the two spindles by the switching device, regardless of whether or not the difference between the positions of the two dancer rolls exceeds the threshold value. The yarn winding machine according to any one of claims 2 to 4, wherein   The control device executes the position difference elimination control immediately after cutting the plurality of yarns by the plurality of cutting means, regardless of whether or not the difference between the positions of the two dancer rolls exceeds the threshold value. The yarn winding machine according to claim 5.   The yarn winding machine according to any one of claims 1 to 6, wherein the control device is capable of changing a traverse width of the plurality of traverse devices.   The yarn winding machine according to claim 7, wherein when the traverse speed of the traverse device is lowered, the control device narrows a traverse width of the traverse device.   9. The control device according to claim 1, wherein the control device executes a winding speed control for moving the positions of the plurality of dancer rolls by adjusting the number of rotations of the spindle. Yarn winder.   The said control apparatus adjusts the rotation speed of the said spindle so that any one dancer roll of these dancer rolls may be moved to the said reference position in the said winding speed control. The yarn winding machine according to 9.   In the winding speed control, the control device adjusts the number of rotations of the spindle so as to move the dancer roll that is closest to the tension side among the plurality of dancer rolls to the reference position. The yarn winding machine according to claim 10.

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