JP3718950B2 - Yarn switching control method for revolving winding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a yarn switching control method for a revolving winding machine, and more particularly, a yarn switching control for a revolving winding machine that reduces tension variation during yarn switching so that a package having excellent uniform characteristics can be obtained. Regarding the method.
[0002]
[Prior art]
For example, as a winder that winds the yarn at a high speed of 4000 m / min or more, a spindle equipped with a bobbin and a roller bale that contacts a package wound up on the bobbin are driven by individual induction motors, There is also a revolving type winder that is provided so that two or more of its spindles can be switched alternately and the thread is switched without interrupting the supply of the yarn every time it is fully wound so that high productivity can be obtained. Well known in the industry.
[0003]
As a disadvantage of this revolving winding machine, there is a so-called end face swelling phenomenon in which both end faces of the package wound at high speed swell in the axial direction, and this phenomenon causes yarn dropping during winding, or breakage of the package during transportation, etc. There was a case.
In Japanese Patent Laid-Open No. 4-341464, as a solution to such a problem, the driving frequency of the roller bale driving induction motor is set so that the roller bail peripheral speed is slightly higher than the package peripheral speed, and the roll is wound up. Proposed method. By setting the drive frequency of the roller veil drive induction motor during regular winding as described above, the thread tension just before being wound on the package can be lowered, so the stress and distortion inside the package is reduced, and the end face bulges. As a result, a package with a very small size can be obtained, and stable operation without thread breakage due to thread dropping at the time of winding becomes possible.
[0004]
However, although this improved winding method has the above-mentioned excellent improvements during normal winding, the driving frequency during normal winding of the roller veil drive induction motor is overfeeding the package peripheral speed. When set to, the roller bale always rotates at the same peripheral speed as the package peripheral speed while being braked from the package side. Therefore, when the package is full and the yarn is switched, if the full package is separated from the roller bale, the roller bale suddenly releases the load of the full package and suddenly increases the peripheral speed. . The next new empty bobbin comes into contact with the roller bale at a peripheral speed higher than the winding speed, so that the yarn tension changes significantly due to the impact, and the yarn at the initial stage of thread switching is made uniform in the bobbin. There was a problem that it could not be rolled up.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to reduce tension fluctuation at the time of yarn switching in a revolving type winding machine in which the driving frequency at the time of normal winding of a roller bale driving induction motor is set to an overfeed state with respect to the package peripheral speed. Another object of the present invention is to provide a yarn switching control method that can obtain a package having excellent uniform characteristics.
[0006]
[Means for Solving the Problems]
The yarn switching control method of the present invention that achieves the above-described object is characterized in that the spindle on which the bobbin is mounted and the roller bale that contacts the package on the bobbin are individually driven by the induction motor, and the driving frequency of the roller bale driving induction motor In the revolving type winder that performs normal winding by controlling the roller bail circumferential speed to be larger than the package circumferential speed,
When switching the thread from the spindle where the bobbin is full to the spindle where the empty bobbin is mounted, the driving frequency of the roller bale driving induction motor is higher than the driving frequency when making the same as the package peripheral speed at the time of normal winding. small so as to switch Rutotomoni, the roller bail is varied in two stages or more in until it comes into contact with the empty bobbin, and controlling such yarn switching ends with returning the drive frequency during the normal winding Is.
[0007]
In this way, the full-winding package is detached by switching the yarn by switching the driving frequency of the induction motor for driving the roller bale so as to be lower than the driving frequency when making it equal to the package peripheral speed at the time of normal winding . The increase in the peripheral speed of the roller bale at the time can be suppressed, and the speed can be almost the same as the peripheral speed of the package, that is, the peripheral speed of the next new empty bobbin. Therefore, even if the next empty bobbin is brought into contact with the roller bale, the yarn can be switched to the empty bobbin with the yarn tension kept in a uniform and stable state without causing impact vibration.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings.
The following figure illustrates the case of 4 yarn winding, but the same applies to other windings such as 2 yarn winding, 8 yarn winding, 12 yarn winding. can do.
[0009]
1 (A) to 1 (C) show a revolving winding machine that implements the yarn switching control method of the present invention in the order of yarn switching, and FIG. 2 shows the side of FIG. 1 (A).
1 and 2, a turret disk 2 is rotatably supported on a base frame 1 and two spindles 3a and 3b are axially supported in parallel so as to face the turret disk 2 with a rotation center therebetween. Each of the four bobbins 4 is mounted so as to be aligned in the axial direction. A drive motor 7 such as a stepping motor is attached to the drive source of the turret board 2, and induction motors 8a and 8b are attached to the drive sources of the spindles 3a and 3b. The rotation speeds of the induction motors 8a and 8b for driving the spindles 3a and 3b are controlled by the frequencies output from the inverters 9a and 9b in accordance with commands from the controller 12, respectively.
[0010]
The turret board 2 has a winding position A on the upper side and a standby position B on the lower side, and two spindles 3a and 3b are separately arranged at the winding position A and the standby position B, respectively. At the winding position A, an elevating bracket 5 is provided on the frame 1 side, and a traverse mechanism (not shown) and a roller bale 6 are provided on the elevating bracket 5. The traverse mechanism supplies the yarn Y supplied from above to the bobbin 4 at the winding position A while traversing left and right.
[0011]
The roller bale 6 is rotationally driven by the induction motor 10, rotates in the same direction as the peripheral surface of the package P while being in contact with the package P on the bobbin 4, and together with the lifting bracket 5 as the diameter of the package P grows. It is designed to move upward. The rotation speed of the induction motor 10 of the roller bale 6 is controlled by the frequency output from the inverter 11 in accordance with a command from the controller 12.
[0012]
In the revolving type winder described above, when the spindle at the winding position A becomes full, the turret board 2 is revolved by 180 ° every time the full winding is reached, and the standby position B is put on standby with an empty bobbin. Instead of the spindle, the thread was switched from the full bobbin to the empty bobbin.
FIGS. 1A to 1C show a situation when the turret board 2 is revolved to switch the yarn. As shown in FIG. 1A, when the bobbin 4 at the winding position A reaches full winding, a revolving driving command is output from the controller 12 to the driving motor 7, and the turret board 2 is operated as shown in FIG. Revolve in the direction of arrow R. As shown in FIG. 1C, the turret board 2 stops when 180 ° revolving is performed, the spindle 3a of the full bobbin is moved to the standby position B, and the spindle 3b of the empty bobbin 4 is moved to the winding position A. The empty bobbin 4 is moved and the roller bale 6 is touched. When the empty bobbin 4 is touched in this way, the yarn Y being wound around the full bobbin at the standby position B by a known means is switched to the empty bobbin 4.
[0013]
In the revolving winding machine of the present invention, when the spindle set at the winding position A performs winding, the rotational speeds of the driving induction motors 8a and 8b of the spindles 3a and 3b at the winding position A are It is controlled by the drive frequency output from the inverters 9a and 9b according to the program set in the controller 12. The control is performed so that the package peripheral speed is constant, and the rotation speed (the number of rotations per unit time) of the spindles 3a and 3b is gradually decreased as the package P grows in diameter.
[0014]
During the normal winding, the roller bale 6 that contacts the package P is such that the drive frequency from the inverter 11 to the drive induction motor 10 is slightly higher at the roller bail peripheral speed than at the package peripheral speed. Be controlled. By controlling the driving frequency for the driving induction motor 10 as described above, the yarn tension just before being wound around the package can be lowered, and the winding can be wound up on the package with a reduced end surface bulge.
[0015]
The roller bale 6 controls the drive frequency for the drive induction motor 10 as described above during normal winding, but underfeeds so that the roller bale peripheral speed becomes smaller than the package peripheral speed during yarn switching. It can be switched to the state. As described above, the drive frequency when underfeeding is set to an underfeed rate of 1 to 5% with respect to the drive frequency when making the same as the package peripheral speed during normal winding. Is preferred. More preferably, the magnitude of the underfeed rate is changed in two steps or more, the underfeed rate in the first half of the yarn switching is large, and the underfeed rate in the second half is gradually reduced so as to decrease. It is good to change it.
[0016]
When the yarn being wound on the full bobbin is switched to the empty bobbin and the normal winding is completed, the driving frequency is again set so that the roller bail peripheral speed becomes higher than the package peripheral speed from that point on. Try to bring it back.
FIG. 3A shows an example of drive frequency control set for the roller bale driving induction motor according to the elapsed time from normal winding before thread switching, thread switching, and normal winding after thread switching. Is graphed with reference to the drive frequency when the speed is the same as the winding speed (package peripheral speed) during normal winding . FIG. 3B shows the change in the roller bale peripheral speed as the difference from the winding speed (package peripheral speed) during normal winding in correspondence with the change in the driving frequency.
[0017]
As shown in FIG. 3A, the driving frequency for the roller bale driving induction motor during normal winding before thread switching is driven when the roller bale peripheral speed is the same as the package peripheral speed during normal winding. The frequency is set to be about 1.5% overfeed with respect to the frequency . The overfeed rate is lowered with the start of the yarn switching operation, and simultaneously with the start of the revolving of the turret board, the underfeed rate is lowered to 2% with respect to the drive frequency when the package peripheral speed is made the same . After maintaining the time T1 during the revolving of the turret board at the same underfeed rate of 2%, the underfeed rate is relaxed to about 1%, and the empty bobbin is touched to the roller bale at the Q point. The underfeed rate is maintained until the yarn switching is completely completed, and when the next normal winding process is started, the drive frequency is returned to the overfeed rate of about 1.5% again.
[0018]
As described above, during normal winding, as shown in FIG. 3B, the roller bail peripheral speed is the same as the package peripheral speed because the roller bale contacts and is braked against the package. Next, at the time of thread switching operation, when the full-wound package is released from the roller bale due to the start of revolving of the tread board, the braking force of the full-wound package is released at the same time as the release, so the roller bale circumferential speed is As indicated by the broken line, it becomes faster than the package peripheral speed. However, the degree of the increase is suppressed as compared with the case where the conventional overfeed rate is kept set (shown by a solid line), and becomes almost the same as the winding speed when the empty bobbin comes into contact pressure after revolving.
[0019]
Therefore, according to the control method of the present invention, there is no impact or the like when the empty bobbin makes contact pressure, and the yarn can be switched with the yarn tension kept in a uniform and stable state.
[0020]
【The invention's effect】
As described above, according to the present invention, the driving frequency of the induction motor for driving the roller bale is smaller than the driving frequency for making the same as the package peripheral speed during normal winding from the overfeed state during normal winding. Therefore, when the yarn is switched, an increase in the peripheral speed of the roller bale when the full winding package is detached from the roller bale can be suppressed, and the speed can be made substantially the same as the winding peripheral speed of the empty bobbin. Therefore, even if the empty bobbin for the next winding comes into contact with the roller bale, no impact is generated, and the yarn can be switched in a stable uniform state.
[Brief description of the drawings]
FIGS. 1A to 1C are explanatory views showing a revolving winding machine that implements the yarn switching control method of the present invention in the order of yarn switching.
FIG. 2 is a side view corresponding to FIG.
FIG. 3A is a graph showing changes in driving frequency for a roller bale driving induction motor at the time of yarn switching and normal winding before and after that, and FIG. 3B is a roller bail circumference corresponding to the above-mentioned (A). It is a graph which shows the change of speed.
[Explanation of symbols]
2 Turret boards 3a and 3b Spindle 4 Bobbin 6 Roller bale 8a, 8b, 10 Induction motors 9a, 9b, 11 Inverter 12 Controller A Winding position B Standby position

Claims (2)

The spindle on which the bobbin is mounted and the roller bale that contacts the package on the bobbin are individually driven by the induction motor, and the driving frequency of the roller bale driving induction motor is greater at the roller bale peripheral speed than at the package peripheral speed. In the revolving type winder that performs regular winding by controlling so that
When switching the thread from the spindle where the bobbin is full to the spindle where the empty bobbin is mounted, the driving frequency of the roller bale driving induction motor is higher than the driving frequency when making the same as the package peripheral speed at the time of normal winding. small so as to switch Rutotomoni, Revolving Shikimakito machine the roller bail is changed in two steps or more in until it comes into contact with the empty bobbin is controlled so that the yarn switching ends with returning the drive frequency during the normal winding Thread switching control method. 2. The underfeed rate is set to 1 to 5% with respect to the driving frequency when the driving frequency of the roller bale driving induction motor at the time of yarn switching is made equal to the package peripheral speed at the time of normal winding. Yarn switching control method for the revolving winding machine.

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