Specification
Title of invention: Thread winding unit
Technical field
[0001]
　The present invention relates to a yarn winding device. More specifically, the present invention relates to control of reverse rotation of a package when performing a yarn joining operation in a yarn winding unit of a yarn winding device.
Background technology
[0002]
　2. Description of the Related Art Conventionally, a yarn winding device has been known in which a yarn supplied from a yarn supplying unit is wound by a winding unit to form a package. Generally, in a winding unit of this yarn winding device, a yarn catching and guiding device that catches a yarn end divided between a yarn supplying part and a winding part, and a yarn end guided by the yarn catching and guiding device A yarn splicing device for splicing is installed. Patent Document 1 discloses a winding unit which is a package forming unit of this type of yarn winding device.
[0003]
　The winding unit of Patent Document 1 has a drive source of an upper yarn guide pipe that captures a yarn unwound from a reverse rotating package, and a speed equal to or lower than a speed at which the yarn is unwound from a yarn layer by the reverse rotation of the package. A control unit for moving the mouth portion of the upper thread guide pipe at a speed. Further, Japanese Patent Laid-Open No. 2004-242242 discloses that it is preferable to control so that the speed at which the mouth portion moves after the upper thread is captured and the speed at which the thread is unwound by the reverse rotation of the package become equal.
Prior art documents
Patent literature
[0004]
Patent Document 1: Japanese Patent Laid-Open No. 2009-155101
Summary of the invention
Problems to be Solved by the Invention
[0005]
　In the winding unit shown in Patent Document 1, even after the operation of guiding the upper thread captured by the upper thread guide pipe to the yarn joining device is completed, the state in which the mouse portion captures the upper thread continues. Therefore, when the mouse portion stands still, it is preferable to stop the reverse rotation of the package. However, since the rotational inertia varies depending on the mass, the time from the start of the control to stop the reverse rotation of the package to the actual stop of the package depends on the amount of the yarn wound on the package (winding amount). It depends on the size of the thread layer taken). As a result, the length of the yarn unwound from the package may change, and the upper yarn guided by the upper yarn guide pipe may become tense or loose, and the yarn splicing work may not be performed well. is there.
[0006]
　The present invention has been made in view of the above circumstances, and an object thereof is to provide a yarn winding unit that can control the timing at which the reverse rotation of the package actually stops.
Means and effects for solving the problems
[0007]
　The problem to be solved by the present invention is as described above. Next, means for solving the problem and its effect will be described.
[0008]
　According to a first aspect of the present invention, a yarn winding unit having the following configuration is provided. That is, this yarn winding unit includes a winding unit, a driving unit, a yarn catching unit, and a unit control unit. The winding unit winds a yarn to form a package. The drive unit is capable of rotating the package and switching the rotation direction. The yarn catching unit causes the drive unit to rotate the package in a direction opposite to the winding direction of the yarn to catch the yarn from the package. The unit controller controls the rotation direction of the package and the start and stop of the rotation. The unit control unit, according to the rotational inertia of the package, at least one of an instruction to stop the reverse rotation, which is the rotation of the package in the reverse direction, and an instruction to decelerate the reverse rotation for that purpose. Change the timing.
[0009]
　As a result, the timing at which the reverse rotation of the package actually stops can be controlled according to the rotational inertia.
[0010]
　In the yarn winding unit, when the rotational inertia of the package is large, the unit control unit instructs the drive unit to stop the reverse rotation of the package, and the reverse rotation for that purpose. It is preferable to issue at least one of the deceleration instructions in (1) at an early timing.
[0011]
　As a result, by sending a stop/deceleration instruction to the drive unit at a stop/deceleration instruction timing according to the magnitude of the rotational inertia, fluctuations in the timing at which the reverse rotation of the package actually stops can be suitably suppressed.
[0012]
　In the yarn winding unit, the unit control unit controls the drive unit so that the reverse rotation of the package is actually stopped at a constant timing regardless of the amount of the yarn wound in the package. It is preferable to issue at least one of an instruction to stop the reverse rotation of the package and an instruction to decelerate the reverse rotation for that purpose.
[0013]
　As a result, the timing of the operation after the reverse rotation of the package is stopped can be aligned, so that the control can be simplified.
[0014]
　The yarn winding unit preferably has the following configuration. That is, the yarn winding unit includes a yarn joining device that joins the yarns captured by the yarn capturing section. The unit controller controls the timing at which the reverse rotation of the package actually stops, and the timing at which the yarn catching unit reaches a guide position for guiding the yarn to the yarn joining device in a state where the yarn catching unit catches the yarn from the package and stops. , And match.
[0015]
　This makes it possible to match the timing at which the reverse rotation of the package actually stops with the timing at which the yarn catching unit finishes guiding the yarn to the yarn joining device and stands still. Therefore, the yarn can be prevented from being stretched or loosened immediately before the yarn splicing device is operated, and thus the yarn splicing by the yarn splicing device can be stably performed.
[0016]
　The yarn winding unit preferably has the following configuration. That is, the yarn winding unit includes a yarn layer diameter acquisition unit that acquires the diameter of the yarn layer wound around the package. When the diameter of the yarn layer acquired by the yarn layer diameter acquisition unit is large, the unit control unit instructs the drive unit to stop the reverse rotation of the package and when the diameter of the yarn layer acquired by the yarn layer diameter acquisition unit is large. At least one of the rotation deceleration instructions is changed.
[0017]
　This makes it possible to appropriately control the timing at which the reverse rotation of the package actually stops by utilizing the fact that the size of the yarn layer diameter of the package greatly affects the size of the rotational inertia.
[0018]
　The yarn winding unit preferably has the following configuration. That is, the yarn winding unit includes a cradle that rotatably supports the package and that rotates as the yarn layer diameter of the yarn wound around the package increases. The yarn layer diameter acquisition unit is an angle sensor that detects a turning angle of the cradle.
[0019]
　Thereby, the size of the yarn layer diameter of the package can be acquired with a simple configuration.
[0020]
　The yarn winding unit may have the following configuration. That is, this yarn winding unit includes a yarn supplying section and a yarn traveling speed detecting device. The yarn supplying section unwinds the yarn from the yarn supplying bobbin and supplies the yarn to the winding section. The yarn traveling speed detecting device is provided in a yarn traveling path between the yarn supplying section and the winding section, and detects a traveling speed of the yarn. The yarn layer diameter acquisition unit acquires the diameter of the yarn layer by calculation using the traveling speed of the yarn detected by the yarn traveling speed detection device.
[0021]
　Also in this case, the size of the yarn layer diameter of the package can be acquired with a simple configuration.
[0022]
　According to a second aspect of the present invention, there is provided the following configuration of a yarn winding device including the yarn winding unit. That is, in this yarn winding device, at least one of the instruction to stop the reverse rotation of the package to the drive unit and the deceleration instruction to reverse the rotation for that purpose corresponds to the magnitude of the rotational inertia of the package. A setting unit that can be attached and set is provided.
[0023]
　Accordingly, even when the type of yarn forming the package is changed, the timing at which the reverse rotation of the package actually stops can be appropriately controlled by changing the setting content accordingly.
Brief description of the drawings
[0024]
FIG. 1 is a schematic front view showing the overall configuration of an automatic winder according to an embodiment of the present invention.
FIG. 2 is a front view and a block diagram showing a schematic configuration of a winder unit.
FIG. 3 is a side view showing how the yarn end is guided to the yarn joining device when the yarn is cut in the winder unit.
FIG. 4 is an enlarged right side view showing the vicinity of the cradle of the winder unit.
FIG. 5 is a timing chart showing an example of reverse rotation control of the package in the winder unit.
FIG. 6 is a diagram for explaining the contents set in the machine control device regarding the timing for instructing the package drive motor to decelerate the reverse rotation and the timing for instructing to stop the reverse rotation.
FIG. 7 is a timing chart showing reverse rotation control of the package in the first modified example.
FIG. 8 is a timing chart showing the reverse rotation control of the package in the second modified example.
MODE FOR CARRYING OUT THE INVENTION
[0025]
　Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view showing the overall configuration of an automatic winder 100 according to an embodiment of the present invention.
[0026]
　An automatic winder (yarn winding device) 100 shown in FIG. 1 includes a plurality of winder units (yarn winding units) 10 arranged side by side, a blower box 70, a machine base control device (setting unit) 80, and a doffing device 90. And, mainly.
[0027]
　An unillustrated blower is arranged inside the blower box 70. The blower functions as a compressed air source for supplying compressed air to each winder unit 10 and also as a negative pressure source for supplying negative pressure.
[0028]
　The machine control device 80 includes an operation unit 81 and a display unit 82, and is configured to be communicable with each winder unit 10. By operating the operation unit 81, the operator of the automatic winder 100 can input a predetermined set value or select an appropriate control method. As a result, the plurality of winder units 10 can be centrally managed. Further, the machine base controller 80 controls the operation of the doffing device 90. The display unit 82 can display the winding state of the yarn 12 of each winder unit 10, the content of the trouble that has occurred, and the like.
[0029]
　The doffing device 90 travels to the position of the winder unit 10 when the package 20 in the winder unit 10 is fully wound (a specified amount of the yarn 12 is wound), and the package 20 is in full winding. Is removed, and an empty winding bobbin 22 is set.
[0030]
　Next, the configuration of the winder unit 10 will be described mainly with reference to FIGS. 2 to 4. FIG. 2 is a front view and a block diagram showing a schematic configuration of the winder unit 10. FIG. 3 is a side view showing how the yarn end is guided to the yarn joining device 3 when the yarn 12 in the winder unit 10 is divided. FIG. 4 is an enlarged right side view showing the vicinity of the cradle 21 of the winder unit 10.
[0031]
　As shown in FIG. 2, each winder unit 10 includes a winding unit body 40 including a yarn supplying section 1 and a winding section 2, and a unit control section 50. The winder unit 10 unwinds the yarn 12 of the yarn supplying bobbin 11 supplied to the yarn supplying section 1 and winds the unwound yarn 12 around a winding bobbin 22 while traversing the package. 20 is formed. In the following description, the rotation of the package 20 in the winding direction of the yarn 20 may be referred to as “forward rotation”, and the rotation in the opposite direction may be referred to as “reverse rotation”. The terms "upstream" and "downstream" mean upstream and downstream in the traveling direction of the yarn 12 when winding the yarn.
[0032]
　The unit controller 50 includes, for example, a CPU and a ROM. The ROM stores a program for controlling each component of the winding unit body 40, a control table, and the like. The CPU executes the program stored in this ROM.
[0033]
　The yarn supplying section 1 can support a yarn supplying bobbin 11 placed on a transport tray (not shown) at a predetermined position, and can unwind the yarn 12 from the yarn supplying bobbin 11. When all the yarns 12 are unwound from the yarn supplying bobbin 11, the yarn supplying unit 1 discharges the empty yarn supplying bobbin 11 and a new yarn supplying bobbin 11 from a yarn supplying bobbin supplying device (not shown). It is configured to be able to receive the supply of. The yarn supplying unit 1 is not limited to the transport tray type as described above, and may be, for example, a magazine type that supports a yarn supplying bobbin supplied from a magazine (not shown) at a predetermined position to unwind and supply the yarn 12. It may be a yarn feeding section.
[0034]
　The winding unit 2 mainly includes a cradle 21 to which the winding bobbin 22 can be attached, a contact roller 26, and a traverse device 25.
[0035]
　The cradle 21 detachably holds the winding bobbin 22 (package 20). The cradle 21 is configured to be rotatable (swirl) toward the front side and the back side of the winder unit 10, and increases the yarn layer diameter of the package 20 accompanying winding of the yarn 12 around the winding bobbin 22 with the cradle. It is configured so that it can be absorbed by rotating 21.
[0036]
　That is, even if the yarn layer diameter of the package 20 changes due to the winding of the yarn 12, the surface of the package 20 can be appropriately brought into contact with the contact roller 26.
[0037]
　The cradle 21 is attached with a package drive motor 61 composed of a servo motor, for example. The winding section 2 winds the yarn 12 on the surface of the winding bobbin 22 (or the surface of the package 20) by rotationally driving the winding bobbin 22 by the package drive motor 61.
[0038]
　The rotation shaft of the package drive motor 61 is connected to the take-up bobbin 22 such that the take-up bobbin 22 is relatively non-rotatable when the take-up bobbin 22 is supported by the cradle 21 (so-called direct drive system). The package drive motor 61 is electrically connected to the unit controller 50, and the unit controller 50 can control the rotation speed and the rotation direction of the package drive motor 61.
[0039]
　The contact roller 26 is rotatably supported, and is configured to be capable of contacting the surface of the winding bobbin 22 or the surface of the package 20 from below. The contact roller 26 can support at least a part of the weight of the winding bobbin 22 or the package 20.
[0040]
　The traverse device 25 includes a traverse arm 35 and a traverse drive motor 36. The traverse arm 35 is rotatably supported, and is configured to be able to hold the thread 12 at its tip. The traverse drive motor 36 drives the traverse arm 35. The traverse drive motor 36 is electrically connected to the unit control unit 50, and the unit control unit 50 interlocks with the package drive motor 61 to drive the traverse drive motor 36 to reciprocally rotate, so that the yarn is wound into the package 20. It is possible to traverse 12 at a predetermined traverse angle.
[0041]
　The cradle 21 includes a lift-up mechanism 60 shown in FIG. The lift-up mechanism 60 can rotate the cradle 21 as necessary to separate the package 20 from the contact roller 26.
[0042]
　As shown in FIG. 4, the lift-up mechanism 60 includes a rotating plate 17, a spring 18, and an air cylinder 71.
[0043]
　The rotating plate 17 is provided so as to rotate integrally with the cradle 21 with the rotating shaft 16 as the center of rotation. The rotation shaft 16 is provided with an angle sensor (thread layer diameter acquisition unit) 63 that detects the turning angle of the cradle 21. The angle sensor 63 can be configured as a potentiometer, for example.
[0044]
　The spring 18 is configured as a tension spring and is connected to the rotating plate 17. The spring 18 is configured to pull the rotating plate 17 in a direction of raising the cradle 21. As a result, even if the yarn 12 is wound around the winding bobbin 22 and the package 20 becomes large, the contact pressure between the contact roller 26 and the package 20 is canceled by offsetting a part of the weight by the spring force. You can prevent it from becoming too large.
[0045]
　The air cylinder 71 is connected to the rotating plate 17 and is configured to expand and contract by the compressed air supplied from the electromagnetic valve 64. The air cylinder 71 lowers the cradle 21 against the spring 18 and brings the contact roller 26 and the package 20 into contact with each other with an appropriate contact pressure when the yarn 12 is not wound around the package 20 much. Further, in the air cylinder 71, when the yarn 12 is wound around the package 20 and becomes large, the spring 18 lifts the cradle 21 to reduce an increase in contact pressure due to the weight of the package 20.
[0046]
　Further, the air cylinder 71 springs when the yarn 12 loses the continuity between the yarn supplying section 1 and the winding section 2 (hereinafter sometimes referred to as a divided state). A force is applied in the direction of lifting the cradle 21 together with 18, and the package 20 is lifted away from the contact roller 26 as shown by the chain line in FIG. As a result, the lift-up function described above is realized.
[0047]
　The winder unit 10 includes an unwinding assisting device 13, a tension applying device 14, a lower yarn catching pipe 4, a yarn joining device 3 in a yarn traveling path between the yarn supplying section 1 and the winding section 2. The yarn quality measuring device (yarn monitoring device) 19 and the upper yarn catching pipe (yarn catching part) 5 are arranged.
[0048]
　The unwinding assisting device 13 includes a restricting member 13a that can be put on the core tube of the yarn supplying bobbin 11. The regulating member 13a is configured in a substantially tubular shape, and is arranged so as to come into contact with the balloon formed above the yarn layer of the yarn supplying bobbin 11. The balloon is a portion in which the yarn 12 unwound from the yarn supplying bobbin 11 is swung by centrifugal force.
[0049]
　By bringing the regulating member 13a into contact with the balloon, tension is applied to the yarn 12 in the balloon portion, and the yarn 12 is prevented from being swung excessively. Thereby, the yarn 12 can be appropriately unwound from the yarn supplying bobbin 11.
[0050]
　The tension applying device 14 applies a predetermined tension to the traveling yarn 12. In the present embodiment, the tension applying device 14 has a gate-type configuration in which movable comb teeth are arranged with respect to fixed comb teeth. The movable comb teeth are urged so that the comb teeth mesh with each other.
[0051]
　By passing the yarn 12 while bending the comb teeth in the meshed state, it is possible to impart appropriate tension to the yarn 12 and improve the quality of the package 20. However, the tension applying device 14 is not limited to the gate type, but may be a disc type, for example.
[0052]
　The bobbin thread catching pipe 4 catches the thread 12 (thread end) on the side of the bobbin 11 when the thread 12 is divided between the yarn supplying section 1 and the winding section 2 for some reason. The yarn joining device 3 can be guided.
[0053]
　Specifically, the lower thread catching pipe 4 is configured to be rotatable around a pipe shaft 41, and a suction port 42 is formed at the tip thereof. An appropriate negative pressure source is connected to the lower thread catching pipe 4, and a suction flow can be applied to the suction port 42.
[0054]
　With this configuration, when the yarn is split, the suction port 42 of the lower yarn catching pipe 4 catches the lower yarn at the position shown by the chain line in FIG. 3, and then turns upward around the pipe shaft 41. By moving, the lower yarn is guided to the yarn joining device 3.
[0055]
　The yarn splicing device 3 splices the yarn 12 (yarn end) on the yarn supplying section 1 side and the yarn 12 (yarn end) on the winding section 2 side when the yarn 12 is in the above-mentioned divided state. To do. In the present embodiment, the yarn joining device 3 is configured as a splicer device that twists the yarn ends with each other by a swirling air flow generated by compressed air. However, the yarn splicing device 3 is not limited to the splicer device, and a mechanical knotter or the like may be used.
[0056]
　The yarn quality measuring device 19 detects a yarn defect by monitoring the thickness of the traveling yarn 12 and the like with an appropriate sensor. A cutter 24 for cutting the yarn 12 immediately when the yarn quality measuring device 19 detects a yarn defect is provided near the yarn quality measuring device 19.
[0057]
　The upper yarn catching pipe 5 is configured so as to be able to catch the yarn 12 (yarn end) on the winding section 2 side and guide it to the yarn joining device 3 when the yarn 12 is in the above-mentioned divided state. ing.
[0058]
　Specifically, the upper thread catching pipe 5 is configured to be rotatable around a shaft 51, and a suction mouth 52 is formed at its tip. The above-mentioned blower is connected to the upper thread catching pipe 5, and the suction flow can be made to act on the suction mouth 52.
[0059]
　The suction mouth 52 is formed to be elongated so as to include the winding width of the package 20. Thereby, the suction flow can be applied to the outer peripheral surface of the package 20 over the entire winding width direction.
[0060]
　A shutter member (not shown) is arranged between the upper thread catching pipe 5 and the blower. By opening/closing this shutter member, generation/stop of the suction flow in the suction mouth 52 can be switched.
[0061]
　An output shaft of a motor 62 is connected to the upper thread catching pipe 5. The motor 62 is electrically connected to the unit controller 50, and the unit controller 50 can control rotation/stop of the motor 62.
[0062]
　With this configuration, at the time of thread cutting or thread cutting, the suction mouth 52 of the upper thread catching pipe 5 catches the upper thread at the upper thread catching position shown by the chain line in FIG. The upper yarn is guided to the yarn joining device 3 by rotating to the yarn joining position indicated by the solid line 3.
[0063]
　As described above, the winder unit 10 can form the package 20 by winding the yarn 12 around the winding bobbin 22.
[0064]
　Next, regarding the operation of the winder unit 10 until the yarn 12 is spliced ​​between the yarn supplying unit 1 and the winding unit 2 and the yarn 12 is spliced ​​and the winding is restarted. , FIG. 2, FIG. 3 and FIG. 5 will be described in detail. FIG. 5 is a timing chart showing an example of reverse rotation control of the package 20 in the winder unit 10.
[0065]
　In the winder unit 10, when the yarn 12 is in the divided state, the yarn end of the divided yarn 12 on the package 20 side (winding unit 2 side) is wound around the inertially rotating package 20. The reason why the yarn 12 is in the cut state is that the yarn 12 is automatically cut by the cutter 24 because the yarn quality measuring device 19 detects the yarn defect, and the yarn 12 is cut by a large tension generated accidentally. However, the present invention is not limited to these. In the following description, the yarn end on the package 20 side may be referred to as the upper yarn end.
[0066]
　The unit controller 50 sends a drive signal to the motor 62 to rotate the needle thread catching pipe 5 upward so that the suction mouth 52 approaches the package 20, and moves to the needle thread catching position shown by the chain line in FIG. Let As a result, the suction mouth 52 of the upper thread catching pipe 5 moves to a position substantially facing the surface of the package 20.
[0067]
　When the suction mouth 52 reaches the upper thread catching position, the unit controller 50 sends a drive signal to the package drive motor 61 to rotate the package 20 in a direction opposite to the yarn winding direction, that is, in the yarn unwinding direction. At the same time (reverse rotation), suction air flow is generated in the suction mouth 52. As a result, the upper yarn end unwound from the package 20 due to the reverse rotation of the package 20 is sucked into the upper yarn catching pipe 5 by the action of the suction air flow when passing through the portion facing the suction mouth 52. ..
[0068]
　On the other hand, the yarn end of the divided yarn 12 on the yarn supplying bobbin 11 side (the yarn supplying portion 1 side) is caught by the suctioned airflow generated at the tip of the lower yarn catching pipe 4. In the following description, the yarn end on the yarn supplying bobbin 11 side may be referred to as a lower yarn end.
[0069]
　After the upper thread end and the lower thread end are captured, the unit controller 50 sends a drive signal to the motor 62 to rotate the upper thread capture pipe 5 downward as shown by the thick arrow in FIG. Further, the unit controller 50 turns the lower thread catching pipe 4 upward as indicated by a thick arrow. As a result, the yarn end on the package 20 side captured by the upper yarn capture pipe 5 and the yarn end on the yarn supplying bobbin 11 side captured by the lower yarn capture pipe 4 are guided to the yarn joining device 3.
[0070]
　After that, the divided yarn ends are joined by the yarn joining device 3. When the yarn 12 is in a continuous state between the yarn supplying unit 1 and the winding unit 2, the unit controller 50 controls the package drive motor 61 to rotate the package 20 in the forward direction and restarts winding the yarn 12.
[0071]
　Next, the above control will be described in detail with reference to the timing chart of FIG.
[0072]
　If the yarn 12 is in the cut state while the yarn 12 is being wound, the unit controller 50 controls the package drive motor 61 to immediately stop the rotation of the package 20. Further, almost at the same time, the lift-up mechanism 60 operates to lift the cradle 21 to separate the package 20 from the contact roller 26.
[0073]
　After that, at the timing of time t0 in FIG. 5, the unit controller 50 starts the upper yarn catching pipe 5 to turn upward. As a result, at the timing of time t1, the suction mouth 52 reaches the upper thread catching position shown by the chain line in FIG. The shutter member arranged in the path connecting the upper thread catching pipe 5 and the blower is opened when the upper thread catching pipe 5 starts to turn upward. At the upper thread catching position, the suction mouth 52 is close to the surface of the package 20, and a strong suction flow can be applied to the surface of the package 20.
[0074]
　At the timing of this time t1, the unit controller 50 sends a signal to the package drive motor 61 to start the reverse rotation of the package 20. The lift-up mechanism 60 releases the lift of the package 20 at a timing when a predetermined time has elapsed after the reverse rotation of the package 20 is started. After that, the reverse rotation speed of the package 20 is maintained at the above-described first speed V1.
[0075]
　With this reverse rotation, the upper yarn end is unwound from the package 20 and captured by the suction mouth 52. A thread detecting sensor 53 is arranged inside the upper thread catching pipe 5, and when the upper thread end is sucked to the suction mouth 52 to some extent, the thread detecting sensor 53 detects the upper thread end. The yarn detection sensor 53 can be configured as an optical sensor, for example.
[0076]
　The reverse rotation of the package 20 at the first speed V1 is continued for a predetermined amount after starting the reverse rotation, and is continued until a predetermined time elapses. After that, at the timing of time t2, the unit controller 50 causes the lift-up mechanism 60 to raise the package 20 again, and at the same time, the reverse rotation speed of the package 20 is increased from the first speed V1 to a predetermined speed higher than the first speed V1. The speed is controlled to increase up to V2. Further, the suction mouse 52 moves so as to be slightly away from the surface of the package 20. Around the timing when the reverse rotation speed of the package 20 reaches the second speed V2, the lift of the package 20 by the lift-up mechanism 60 is canceled.
[0077]
　With this reverse rotation, the upper yarn end is further unwound from the package 20 and sucked into the suction mouth 52. The reverse rotation of the package 20 at the second speed V2 with the suction mouth 52 slightly separated from the package 20 causes the yarn 12 to be separated by the yarn quality measuring device 19 when it detects a yarn defect. It is continued for a time obtained by adding a time corresponding to the length of the detected yarn defect and an appropriate margin time. As a result, of the yarn 12 wound around the package 20, all the portions including the yarn defect can be discarded. Further, since the reverse rotation speed of the package 20 at this time is the relatively high second speed V2, the yarn 12 can be unwound quickly.
[0078]
　After that, at the timing of time t3, the unit controller 50 sends a drive signal to the upper thread catching pipe 5 to turn the suction mouth 52 downward (movement to a yarn joining position where the upper yarn is guided to the yarn joining device 3). ) Is started. At time t4, which is the timing before the upper yarn catching pipe 5 reaches the yarn joining position, the unit controller 50 sends a drive signal to the package drive motor 61 to start decelerating the reversely rotating package 20. Let
[0079]
　In the present embodiment, the unit controller 50 linearly decreases the command speed from the above-described second speed with respect to the package drive motor 61 starting from time t4 which is the timing of the start of deceleration (deceleration command). Finally, at time t5, the instruction speed is set to zero (stop instruction). However, when the yarn layer diameter of the package 20 is large, even if the instructed speed is reduced to zero as described above, the strong inertial rotation of the package 20 cannot be sufficiently weakened. The timing at which the rotation actually stops is delayed from time t5.
[0080]
　In this respect, the unit control unit 50 of the present embodiment changes the timing of the instruction to stop the reverse rotation of the package 20 to the package drive motor 61 and the instruction to decelerate the reverse rotation therefor according to the yarn layer diameter of the package 20. To do. Specifically, when the yarn layer diameter of the package 20 is large, the package driving motor 61 is instructed to decelerate and stop the reverse rotation earlier than when the yarn layer diameter is small. Referring to the example of FIG. 5, when the yarn layer diameter of the package 20 is small, the reverse rotation deceleration is instructed at time t4 and the stop is instructed at time t5. Is larger, deceleration of the reverse rotation is instructed at time t4x, and stop is instructed at time t5x. By changing the timing of the instruction of deceleration and stop in this way, the intended timing (in other words, the time t5 at which the upper thread catching pipe 5 reaches the yarn joining position and stands still regardless of the size of the yarn layer diameter). The reverse rotation of the package 20 can be actually stopped at the timing. As a result, it is possible to prevent the upper thread from being stretched or loosened.
[0081]
　In this way, the yarn 12 from the package 20 is guided to the yarn joining device 3, and the yarn joining by the yarn joining device 3 is started. Almost at the same time, the shutter member arranged in the path connecting the upper yarn catching pipe 5 and the blower is closed, and as a result, the suction flow in the suction mouth 52 is stopped.
[0082]
　The relationship between the timing at which the unit controller 50 gives an instruction to stop or decelerate the reverse rotation and the size of the yarn layer diameter can be set by the operator operating the machine base controller 80. For example, as shown in FIG. 6, the size of the yarn layer diameter is divided into three stages, and for each stage of the yarn layer diameter, the timing of instructing the package drive motor 61 to decelerate the reverse rotation and the reverse rotation It is conceivable to set the timing to instruct the stop.
[0083]
　The setting content can be changed by the operator operating the operation unit 81 of the machine control device 80. Therefore, even if the weight density of the package 20 changes due to a change in the type of the yarn 12 forming the package 20 or a change in the winding angle of the yarn 12 in the automatic winder 100, it is possible to respond flexibly. You can
[0084]
　As described above, the winder unit 10 of this embodiment includes the winding unit 2, the package drive motor 61, the upper thread catching pipe 5, and the unit control unit 50. The winding unit 2 winds the yarn 12 to form the package 20. The package drive motor 61 drives the package 20 to rotate, and the rotation direction can be switched. The upper yarn catching pipe 5 catches the yarn 12 from the package 20 by rotating the package 20 in a direction opposite to the winding direction of the yarn 12 by the package drive motor 61. The unit controller 50 controls the rotation direction of the package 20 and the start and stop of the rotation. The unit controller 50 changes the timing of the instruction to stop the reverse rotation of the package 20 to the package drive motor 61 and the instruction to decelerate the reverse rotation for the stop according to the rotation inertia of the package 20.
[0085]
　As a result, the timing at which the reverse rotation of the package 20 actually stops can be controlled according to the rotational inertia.
[0086]
　Further, in the winder unit 10 of the present embodiment, the unit controller 50 instructs the package drive motor 61 to stop the reverse rotation of the package 20 when the rotational inertia of the package 20 is large, compared to when the rotational inertia of the package 20 is small, and Therefore, at least one of the reverse rotation deceleration instructions is issued at an early timing.
[0087]
　As a result, by sending a stop/deceleration instruction to the package drive motor 61 at a stop/deceleration instruction timing according to the magnitude of the rotational inertia, fluctuations in the timing at which the reverse rotation of the package 20 actually stops can be suitably suppressed. You can
[0088]
　In the winder unit 10 of the present embodiment, the unit controller 50 actually performs the reverse rotation of the package 20 at a constant timing (timing at time t5) regardless of the amount of the yarn 12 wound around the package 20. To stop the reverse rotation of the package 20 to the package drive motor 61, and to decelerate the reverse rotation for stopping.
[0089]
　As a result, the timing of the operation after the reverse rotation of the package 20 is stopped (for example, the timing of the yarn joining operation by the yarn joining device 3) can be made uniform, so that the control can be simplified.
[0090]
　Further, the winder unit 10 of the present embodiment includes the yarn joining device 3 that joins the yarn 12 captured by the upper yarn capturing pipe 5. The unit controller 50 determines the timing at which the reverse rotation of the package 20 actually stops and the timing at which the upper yarn catching pipe 5 reaches the guide position for catching the yarn 12 from the package 20 and guiding it to the yarn joining device 3 (time t5). ), and match.
[0091]
　This makes it possible to match the timing at which the reverse rotation of the package 20 actually stops with the timing at which the upper yarn catching pipe 5 finishes guiding the yarn 12 to the yarn joining device 3 and stands still. Therefore, the yarn 12 can be prevented from being stretched or loosened immediately after the reverse rotation of the package 20 is actually stopped, and thus the yarn joining by the yarn joining device 3 can be stably performed.
[0092]
　Further, the winder unit 10 of the present embodiment includes an angle sensor 63 that acquires the diameter of the yarn layer wound around the package 20. When the diameter of the yarn layer acquired by the angle sensor 63 is large, the unit controller 50 instructs the package driving motor 61 to stop the reverse rotation of the package 20 and to instruct the deceleration of the reverse rotation accordingly, as compared with the case where the diameter is small. Perform at an early timing.
[0093]
　This makes it possible to appropriately control the timing at which the reverse rotation of the package 20 actually stops by utilizing the fact that the size of the yarn layer diameter of the package 20 greatly affects the size of the rotational inertia.
[0094]
　Further, the winder unit 10 of the present embodiment includes a cradle 21 that rotatably supports the package 20 and swivels as the yarn layer diameter of the yarn 12 wound around the package 20 increases. The angle sensor 63 acquires the yarn layer diameter by detecting the turning angle of the cradle 21.
[0095]
　Thereby, the size of the yarn layer diameter of the package 20 can be acquired with a simple configuration.
[0096]
　However, the winder unit 10 may acquire the yarn layer diameter of the package 20 as follows. That is, a yarn traveling speed detecting device (not shown) is provided in the yarn traveling path between the yarn supplying section 1 and the winding section 2. By obtaining the winding length of the yarn 12 by integrating the yarn traveling speed detected by the yarn traveling speed detecting device with time, and converting the winding length into the yarn layer diameter by a known calculation formula, The yarn layer diameter of the package 20 is calculated.
[0097]
　This yarn traveling speed detection device detects yarn unevenness by, for example, two sensors (for example, optical sensors) arranged along the yarn traveling path, and compares the time variation of the waveform detected by the sensor to detect the yarn unevenness. It is possible to obtain a time difference when the same portion has passed the two sensors, and obtain the traveling speed of the yarn based on the time difference. The yarn quality measuring device 19 may be configured to have a function of detecting the traveling speed of the yarn based on the above principle.
[0098]
　Also in this case, the size of the yarn layer diameter of the package 20 can be acquired with a simple configuration.
[0099]
　Further, the automatic winder 100 of this embodiment includes a winder unit 10. The automatic winder 100 includes a machine base controller 80. The machine base control device 80 responds to the magnitude of the rotational inertia of the package 20 by at least one of the instruction to stop the reverse rotation of the package 20 to the package drive motor 61 and the deceleration instruction to the reverse rotation for that purpose. It can be attached and set. The setting contents of the machine control device 80 can be changed by an operator's operation.
[0100]
　Thereby, even when the type of the yarn 12 forming the package 20 is changed, the reverse rotation of the package 20 can be appropriately controlled by changing the setting content accordingly.
[0101]
　Next, two modifications regarding deceleration and stop of the reverse rotation of the package will be described. In the description of these two modified examples, the same or similar members as those in the above-described embodiment may be designated by the same reference numerals and the description thereof may be omitted.
[0102]
　In the first modified example shown in FIG. 7, when the yarn layer diameter of the package 20 is large, the unit controller 50 instructs the package drive motor 61 to decelerate the reverse rotation at an earlier timing than when the yarn layer diameter of the package 20 is small. Specifically, when the yarn layer diameter of the package 20 is small, reverse rotation deceleration is instructed at time t4, whereas when the package 20 yarn layer diameter is large, reverse rotation deceleration is performed at time t4. Instructed at t4x.
[0103]
　However, in the present modified example, when the yarn layer diameter of the package 20 is large, the gradient of decreasing the instruction speed in order to decelerate the reverse rotation of the package 20 is gentle as compared with the case where the yarn layer diameter is small. As a result, the timing for instructing the package drive motor 61 to stop the reverse rotation (that is, zero speed) is the same time t5 regardless of the size of the yarn layer diameter of the package 20.
[0104]
　In the second modification shown in FIG. 8, the unit controller 50 instructs the package drive motor 61 to decelerate the reverse rotation regardless of the yarn layer diameter of the package 20 at the same time t4.
[0105]
　However, in the present modified example, when the yarn layer diameter of the package 20 is large, the gradient that decreases the instruction speed in order to decelerate the reverse rotation of the package 20 becomes steeper than when it is small. As a result, when the yarn layer diameter of the package 20 is large, the timing at which the unit controller 50 instructs the package drive motor 61 to stop the reverse rotation (that is, zero speed) is time t5x, and the yarn layer of the package 20 is It is faster than when the diameter is small (time t5).
[0106]
　As shown in the above two modified examples, the gradient that decreases the instruction speed to the package drive motor 61 in order to decelerate the reverse rotation of the package 20 is changed according to the size of the yarn layer diameter of the package 20. May be.
[0107]
　Although the preferred embodiment and modification of the present invention have been described above, the above configuration can be modified as follows, for example.
[0108]
　The control of the reverse rotation of the package 20 before the time t3 in FIG. 5 can be changed as appropriate instead of the above-described control.
[0109]
　Regarding the change in the instruction speed output from the unit controller 50 to the package drive motor 61 in order to decelerate the reverse rotation of the package 20, instead of changing linearly as shown in FIG. It may be configured to change with.
[0110]
　The timing for instructing the package drive motor to decelerate/stop the reverse rotation is set in two steps or in four steps or more instead of setting the thread layer diameter in three steps as shown in FIG. Can be changed. Further, for example, by setting a function parameter in the machine control device 80, the above timing can be changed so as to change steplessly.
[0111]
　Instead of the control based on the yarn layer diameter, control based on another parameter (for example, package weight) indicating the magnitude of the rotational inertia may be performed.
[0112]
　When the package 20 is rotating in the reverse direction, the unit controller 50 may give a stop instruction (instruction of zero speed) to the package drive motor 61 without giving a deceleration instruction in advance.
[0113]
　A brake mechanism may be provided in the package drive motor 61 so that the brake mechanism operates when the reverse rotation is stopped or decelerated.
[0114]
　The reverse rotation control of the package 20 of the present invention is not limited to the winder unit 10 configured to directly rotate the package 20 by the package drive motor 61 and traverse the yarn 12 by the arm type traverse device 25. For example, a cylindrical drum that contacts the outer peripheral surface of the package 20 may be driven by a motor, and the yarn 12 may be traversed by a spiral traverse groove formed in the drum. In this case, the motor that drives the drum corresponds to the drive unit.
Explanation of symbols
[0115]
　2 winding section
　5 upper thread catching pipe (thread catching section)
　10 winder unit (thread winding unit)
　12 thread
　20 package
　50 unit control section
　61 package drive motor (driving section)
The scope of the claims
[Claim 1]
　A winding unit that winds up a yarn to form a
　package, a drive unit that rotationally drives the package and can switch the rotation direction of the package, and the
　drive unit that rotates the package in a direction opposite to the winding direction of the yarn. a thread catching portion for catching the yarn from the packages designed,
　the rotational direction of the package, the start and stop of the rotation, and a unit control section for controlling,
with a
　said unit control section, the rotational inertia of the package In accordance with the above, at least one of the instruction to stop the reverse rotation, which is the rotation in the reverse direction of the package, and the deceleration instruction for the reverse rotation for that purpose, is changed to the drive unit. Thread winding unit.
[Claim 2]
　The yarn winding unit according to claim 1,
　wherein the unit control unit instructs the drive unit to stop the reverse rotation of the package when the rotational inertia of the package is large, as compared with when the rotational inertia of the package is small, and A yarn winding unit, wherein at least one of the reverse rotation deceleration instructions for that purpose is issued at an early timing.
[Claim 3]
　The yarn winding unit according to claim 1 or 2,
　wherein the unit controller actually stops the reverse rotation of the package at a constant timing regardless of the amount of the yarn wound around the package. As described above, the yarn winding unit is configured to issue at least one of an instruction to stop the reverse rotation of the package and an instruction to decelerate the reverse rotation for that purpose to the drive unit.
[Claim 4]
　The yarn winding unit according to claim 3, further
　comprising a yarn joining device that joins the yarns caught by the yarn catching unit,
　wherein the unit control unit sets a timing at which reverse rotation of the package actually stops. And a timing at which the yarn catching portion reaches a guide position for guiding the yarn to the yarn joining device in a state where the yarn catching portion catches the yarn from the package and stops the yarn winding unit.
[Claim 5]
　The yarn winding unit according to any one of claims 1 to 4, further
　comprising: a yarn layer diameter acquisition unit configured to acquire a diameter of the yarn layer wound around the package,
　wherein the unit control unit includes: When the diameter of the yarn layer acquired by the yarn layer diameter acquisition unit is large, at least one of the instruction to stop the reverse rotation of the package to the drive unit and the instruction to decelerate the reverse rotation therefor, as compared with the case where the diameter is small. A yarn winding unit characterized by changing any timing.
[Claim 6]
　The yarn winding unit according to claim 5
　, further comprising a cradle that rotatably supports the package and that rotates with an increase in a yarn layer diameter of the yarn wound in the package, the
　yarn layer diameter acquiring unit. Is an angle sensor that detects a turning angle of the cradle.
[Claim 7]
　The yarn winding unit according to claim 5,
　wherein a yarn supplying unit that unwinds a yarn from a yarn supplying bobbin and supplies the yarn to the
　winding unit, and a yarn traveling between the yarn supplying unit and the winding unit. A yarn traveling speed detecting device provided in the route for detecting a traveling speed of the yarn
,
　wherein the yarn layer diameter acquiring section uses the traveling speed of the yarn detected by the yarn traveling speed detecting device to detect the yarn traveling speed. A yarn winding unit characterized in that the diameter of a layer is obtained by calculation.
[Claim 8]
　A yarn winding device including the yarn winding unit according to any one of claims 1 to 7,
　wherein a reverse rotation stop instruction for the package to the drive unit and a reverse rotation deceleration instruction therefor are provided. A yarn winding device comprising a setting unit capable of setting at least one of the timings in association with the magnitude of the rotational inertia of the package.