JPS6392578A - Controlling method for filament winder - Google Patents

Abstract

PURPOSE:To keep off the occurrence of defective yarn and the release failure of a filament, by setting a winding angle between the filament in a package and an empty bobbin to the specified range according to a bobbin's winding diameter and altering a turret turning angle according to a diameter of the package just prior to transference. CONSTITUTION:Plural pieces of bobbin holders 2 and 3 are installed in a turret table 1 free of rotation, and if a filament to be wound on one side of these bobbin holders comes to the specified quantity, the filament is designed so as to transferred to the other side of the bobbin holder in order. At the time of transferring, each rotational direction of these bobbin holders 2 and 3 and that of the turret table 1 are rotated in the reverse direction to each other. And, in this winder, a winding angle between the filament wound on a package and an empty bobbin is properly set within the range of more than 0 deg. to 30 deg. according to a full wind and a winding diameter of the empty bobbin, while axial timing (or, a turret turning angle) of these bobbin holders 2 and 3 is properly altered according to a diameter of the package wound just prior to transferrence.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control method for a turret type winder, particularly a method for controlling a winding angle formed between a yarn and an empty bobbin when switching yarns during high-speed winding. This invention relates to a method of controlling a turret type winder.

(Prior Art) In recent years, in turret type winding machines in which a turret table equipped with a plurality of bobbin holders is rotated by a drive device and a fully wound bobbin is sequentially switched to an empty bobbin, the number of yarns wound on a single bobbin is The weight is 200 kg, and the length of the bobbin is 1200 mm, and the structure thereof tends to become larger and longer. In particular, today there are 4,000 winding machines.
The speed has increased to more than m/min, the size has increased, and the winding diameter ratio (
As the maximum winding diameter/empty bobbin diameter increases, it is important to be able to switch appropriately from small to full packages, regardless of the winding diameter, in order to improve yarn quality and reduce costs. This has become a major issue.

As such conventional turret type winding machines, for example, Japanese Patent Application Laid-Open No. 59-212366 and Japanese Patent Application Laid-open No. 57-85764 are known.
There is something described in the No.

17 to 26 are diagrams for explaining the winding method of the turret type winder. In FIG. 17(a), l is a turret table rotatably mounted on the frame of the winding machine, and the turret table 1 has a bobbin holder 2.
．． 3 is provided. These bobbin holders 2.3 are rotationally driven by an electric motor (not shown). On the other hand, the turret table 1 is operated by an electric motor with a reducer installed in the frame, and a sprocket (not shown) attached to the output shaft of the turret table 1, an electric shaft with a reducer, and a chain mounted on these sprockets. Driven through. 4.5 is a bobbin that is fitted and attached to the bobbin holder 2.3 and winds the thread, and a contact roller 6 contacts the bobbin 4 or 5 on the winding side to apply surface pressure to a traverse device (not shown). The yarn is traversed to form a package on the bobbin 4 or 5 at a constant winding speed. In the turret type winder configured in this way,
Conventionally, the following two methods have been implemented.

(b) Method of guiding the yarn to the gripping means by bringing the empty bobbin into contact with the yarn: Fig. 17 (a), (b), Fig. 18 (a), (b),
Figure 20 (a), (b), Figure 21 (a), (b) (b) Method of gripping the yarn with the gripping means at the same time as the empty bobbin and the yarn come into contact: Figure 17 (a), (C), Figure 18 (a), (C),
FIGS. 20(a) and 21(b), FIGS. 21(a) and 21(b) Below, problems with switching between the two methods described above will be explained.

FIGS. 17(a) and 17(b) are diagrams showing the moment when the thread wound around the package comes into contact with the empty bobbin.

When the thread is removed from the traverse guide (not shown), the thread is punch-wound onto the package 7, and the thread curls while the outer periphery of the empty bobbin 4 and the direction of thread travel are opposite to each other as shown in FIGS. The turret table 1 rotates clockwise until contact is made at θ8 as shown in b), and when the winding angle reaches θ, the empty bobbin holder moves to the right in the figure until the thread and the slit of the empty bobbin engage. The thread is caught in the slit.

Figure 19 is a diagram showing the behavior of yarn tension upstream of the empty bobbin when changing the yarn in a small winding package. The tension on the take-up side is increased slightly and the thread is switched from the take-up side to the empty bobbin side at the 0th part.
The punch is wound onto the empty bobbin between d and d. During this time, the punch is wound in one place, so the diameter increases and the tension increases slightly.Next, a winding coil is applied between e and the yarn is caught by the traverse guide to form the package.

Figures 20 (a) and (b) of the Teiichi Yosan piece show the moment when the thread wound on the package contacts the empty bobbin during the full winding change, and the thread is removed from the traverse guide and punch-wound onto the package. However, the outer periphery of the empty bobbin and the direction of travel of the thread are opposite to each other, and although the thread is jostling, the empty bobbin slits due to contact at the same turret angle as in the case of small winding, that is, θ2 (approximately 45° when fully wound) as shown in Fig. 21. The thread is caught. At this time, θ2 is approximately 45°.

Figure 22 is a diagram showing the behavior of thread tension upstream of the empty bobbin when switching threads in a full package. In the figure, when the turret starts, the number of revolutions on the winding side Although the tension is increased slightly by increasing the tension, the winding angle θ between the yarn wound into the full package and the empty bobbin is as shown in FIGS. 21(a) and (b).
2, because the traveling direction of the yarn and the traveling direction of the surface of the empty bobbin are opposite to each other, the tension between the part b and the part 0 in Figure 22 decreases as the yarn and the empty bobbin are strained, and the empty bobbin Even after the yarn is gripped, the tension of the yarn upstream of the empty bobbin decreases as shown in section d.

Note that the timing of moving the bobbin holder 2 or 3 in the axial direction is changed at the same turret angle both when switching to small winding and when switching to full winding.

(Problem to be Solved by the Invention) However, in such a conventional control method for a yarn winding machine, the winding angle between the yarn wound on the package and the empty bobbin is different from full winding to empty bobbin. Since the winding diameter is determined independently of the winding diameter of the bobbin, there is a problem in that the winding angle becomes inappropriate especially when switching to full winding, and the switching success rate decreases significantly. These problems will be discussed below when switching to a full volume and when switching to a small volume.

In a turret type winding machine in which the rotating direction of the bobbin holder and the rotating direction of the turret table are opposite to each other, the outer circumference of the bobbin and the direction of the thread are opposite to each other at the time of switching. The thread may loosen due to squeezing, but when switching to full winding, the wrapping angle θ2 is as shown in Figure 21 (a).
, (b), the angle is about 45°, and the slack of the thread is large compared to when switching to a small winding, and the switching success rate is significantly lowered.

FIG. 23 is a diagram showing the relationship between the wrapping angle θ2 and the switching success rate when switching is performed 50 times at each wrapping angle (
However, the winding speed is 4000 m/min at the φ point and 6000 m/ll1n at the x point, both when the denier is 75 de. As is clear from the figure, the inventor found that when the wrapping angle θ2 exceeds about 30°, the switching success rate decreases significantly.

+1B old I call When switching to small winding, the winding angle θ between the yarn and the empty bobbin.

As described above in FIGS. 18(a) and 18(b), the switching success rate is relatively good, but as the winding diameter increases, the contact angle between the empty bobbin and the yarn increases and 2
As shown in Figure 2, the thread tension decreases and the thread is not gripped by the empty bobbin, the thread is squeezed and breaks, or the thread becomes loose and wraps around the feed roller, resulting in poor switching success rate. decreases. Furthermore, even if the yarn switching is successful, as shown in Figure 22, there is a problem in that the tension in the inner layer is not recovered properly, causing unevenness in the yarn quality and loosening of the yarn in the inner layer, resulting in poor unwinding in the subsequent process. . Figure 26 shows denier of 75 de and 150 de and winding speed of 4000 m/min.
It is a figure showing the relationship between the amount of punches formed on the empty bobbin (that is, the time for forming the amount of punches on the empty bobbin) and the switching success rate when switching at 6000 m/min.

In addition to the above-mentioned problems such as a decrease in the winding success rate,
The conventional winding method also has the following problems. In other words, in the conventional winding method, as shown in FIG. 17(c) or FIG. 19(C), the yarn wound around the package contacts the empty bobbin at the time of switching, and the bobbin catches the yarn at the same time. In addition to forming the pig till, the timing of moving the bobbin holder in the axial direction is carried out at the same timing angle whether switching to small or full winding, so when switching to full winding, the amount of punches wound on the empty bobbin increases, causing contact. The outer diameter that comes into contact with the roller becomes larger, and the rotational speed of the empty bobbin decreases. Therefore, as shown in the tension behavior shown in Figure 25, the circumferential speed at which the yarn is wound decreases until the outer diameter of the yarn layer wound on the inner layer exceeds the outer diameter of the punch from the zero point, and the yarn slackens and the switching is successful. There has been a problem in that the inner layer becomes loose and the threads of the package become in-centered, resulting in poor unwinding even if there is no reduction in rate or switching errors.

(Purpose of the Invention) Therefore, the present invention aims to appropriately set the winding angle between the yarn wound on the package and the empty bobbin in a range of more than 0° and 30° depending on the winding diameter of the full winding or empty bobbin. At the same time, by appropriately changing the timing of the axial movement of the bobbin holder (i.e., the turret rotation angle) according to the diameter of the package wound just before switching, it is possible to handle any winding diameter from small to full. The purpose is to achieve a high switching success rate and prevent the generation of defective yarns or yarn unwinding defects that occur during switching.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a control method for a yarn winding machine according to the present invention includes a plurality of bobbin holders rotatably protruding from a turret plate, and winding is performed on one bobbin holder. When the yarn reaches a predetermined amount, the yarn is sequentially transferred to the other bobbin holder, and at the time of switching, the rotation direction of the bobbin holder and the rotation direction of the turret table are rotated in opposite directions. A method for winding a yarn using a winding machine, wherein the timing at which the yarn gripping means grips the yarn is such that the winding angle between the yarn wound on the package and the empty bobbin exceeds 0 degrees and is in the range of 30 degrees. I try to control it.

(Function) In the present invention, the winding angle between the yarn wound on the package and the empty bobbin is appropriately set in a range of 30° exceeding Oo, depending on the winding diameter of the full winding or the empty bobbin. The timing of the axial movement of the bobbin holder (that is, the turret rotation angle) is appropriately changed according to the diameter of the package wound up immediately before switching. Therefore, a high switching success rate is achieved for any winding diameter from small winding to full winding, and generation of defective yarns or yarn unwinding failures that occur during switching are prevented.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1-16 is a diagram showing an embodiment of a winding machine to which the control method according to the present invention is applied. First, the configuration will be explained. FIG. 1 is a partially sectional perspective view of the appearance of the winding machine, and FIG. 2 is an overall configuration diagram. Components that are the same as those of the conventional example described above are given the same numbers and their explanations will be omitted. In Figure 1, 2.3
is a bobbin holder, the bobbin holders 2 and 3 are slidably provided in the axial direction on the turret table 1, and a spindle (not shown) that rotatably supports the bobbin holder 2.3 is connected to a motor (induction motor) 8. .9 respectively. In addition, the turret table 1 is equipped with a torque limiter 1.
1 (not shown), is connected to a turret motor 10 via sprockets 12, 13 and a chain 14 (not shown), and thread switching is performed by driving (rotating) the turret motor 10. A contact roller 6 is disposed above the bobbin holder 2 and is driven by friction in pressure contact with the bobbin holder 2 (or 3), and the contact roller 6 is in contact with the bobbin 5 (or 4) during yarn winding, and the contact pressure is applied to the bobbin 5 (or 4). is held at a predetermined value. Further, an electromagnetic pickup 15 (not shown) is disposed close to a gear 16 connected to the shaft of the contact roller 6, and detects the rotational speed of the gear 16 (not shown) to indirectly support the contact roller 6.
Detects the rotation speed. Then, the frequency of the inverter 36 (or 35) is operated so that the rotation speed of the contact roller 6 becomes a predetermined value, and the bobbin holder 3 (or 2
) that drives the motor 9 (or 8). A traverse case 20 has a traverse guide 19 that traverses the yarn approximately parallel to the contact roller 6.
The motor 17 is driven by an inverter 18b, and the motor 17 is connected to the traverse cam 18a and drives the traverse cam 18a.
8. The yarn is traversed by the traverse guide 19 that engages with a.The traverse case 20 has a traverse guide provided above the traverse guide 19 so as to push out the yarn held by the traverse guide 19 and traversed toward the contact roller 6 side. A thread removal plate 21 is provided for removing the thread from the thread removal member 19, and thread removal is performed by operating a fluid cylinder 22 (not shown) and rotating the thread removal temporary 21. Further, in the traverse case 20, the yarn traversed from the yarn removal plate 11 is removed from the traverse guide 19, and the contact roller 6 is placed at a position facing the traverse case 20.
A punch guide 23 is disposed above the yarn gripping means formed in a bobbin that grips the yarn in the traverse range when switching the yarn. A frame supporting these contact rollers 6, a traverse case 20, is fixed to a slide block 24, and the slide block 24 is supported by a slide shaft 25 so as to be movable up and down, and moves up and down as the winding process progresses. Reference numeral 26 denotes a guide, which is a thread hook provided on the side of the bobbin holder 2.3 in parallel along the axis of the bobbin holder 2.3;
7, they are arranged at intervals corresponding to the thread gripping grooves formed on the bobbin. Furthermore, the holder 27 projects from the arm 28 and is connected to an actuator 29, and the thread hook is sometimes swung downward by the actuator 29, and this swinging position is such that the thread hook is sometimes rotated downwardly by the actuator 29. The thread hook is arranged so that the thread hung on the guide 26 does not come into contact with the outer periphery of the contact roller 6 when it passes between the thread removal plate 21 at the thread removal position. The thread guide 26 may be configured to be movable toward the front of the winder, or may be fixed.

In FIG. 2, 30 is a rotary encoder,
The rotary encoder 30 detects the rotation angle when the turret table 1 rotates, and cylinders 31, 32 and punch guides 23 for moving the bobbin holders 2 and 3 according to predetermined data preset in the ROM 52, which will be described later. Thread removal plate 21, cylinder 33 and arm 2
8, solenoid valves 34a, 34b,
The operation timings of 34c, 34d, 34e, 34f, etc. are determined. On the other hand, electric power from the inverter 17 is supplied to the motor 18b that drives the traverse cam 18a, and electric power from the inverters 35 and 36 is supplied to the motors 8 and 9 that drive the bobbin holder 2.3. In addition, motor 8.9
does not necessarily have to be an induction motor. In addition, the output from the electromagnetic pickup 15 is output from the microcomputer 37.
The output from the setting device 38 is further input to the microcomputer 37. The setting device 38 is used to set the yarn winding speed, the number of packages, etc., and this setting input is performed by, for example, an operator of the winding machine.

The microcomputer 37 includes a CPU51 and a ROM52.
, RAM 53 and I10 port 54,
These are connected to each other by a common bus 55.

The CPU 51 takes in necessary external data according to the program written in the ROM 52, exchanges data with the RAM 53, and calculates processing values necessary for yarn winding control. , and outputs the processed data to the I10 port 54 as necessary. I1
Signals from the electromagnetic converter 15 and setting device 38 are input to the 0 port 54, and command signals to the inverters 17, 35, and 36 are output from the I10 port 54. The ROM 52 stores execution programs and data for the CPU 51, and the RAM 53 temporarily stores external information and data used in calculations.

FIG. 3 is a flowchart showing a winding control program executed by the microcomputer 37.

This program starts when the yarn is placed on the bobbin 4 (or 5), and a timer for setting the winding time is set (step P). When the program starts, the yarn is wound while the winding speed is controlled to a predetermined value according to the steps described below. That is, when the yarn is applied, it is continuously spun and the yarn supplied from above is traversed by the traverse guide 19 to form a package on the bobbin 4 mounted on the bobbin holder 2.

At this time, a predetermined contact pressure is applied between the package 7 and the contact roller 6, and the winding speed is controlled by the contact roller 6.
The rotation speed of becomes a predetermined value.

In Pl, it is determined whether or not the yarn wound on the bobbin 4 has reached a predetermined winding amount (the timer has timed up). Wait until the yarn reaches a predetermined amount of winding. Next, at P3, remove the bobbin holder on the back side (B
H) 3 is started, and it is determined in P4 whether the number of revolutions of the bobbin holder 20 has reached a predetermined number of revolutions. Here, when starting the bobbin holder 3 on the backup side, the bobbin holder 3 is rotated at a predetermined rotation speed N (for example, when the circumferential speed of the bobbin 4 is 0.00000 times the winding speed).
Start up the engine so that the rotational speed increases by about 2 to 1.5%. When the number of revolutions N of the bobbin holder 20 reaches a predetermined number of revolutions, the number of revolutions N of the bobbin holder 3 on the winding side is counted at P, and the number of revolutions N counted at P is combined with the speed set in advance in the setting device 38. The package diameter d during winding is calculated according to the following equation (2). On the other hand, when the number of rotations of the bobbin holder 2 does not reach the predetermined number of rotations, the process remains in standby at P4. In this embodiment, the rotation speed N of the bobbin holder 3 is used as a parameter for calculating the pan cage diameter d, but the parameter is not limited to this, and may be an inverter frequency or an inverter setting signal.

Further, the package diameter d may be calculated from the amount of movement of the slide block to which the contact roller is attached.

■ d=□ ......■ πN In P7, each rotation angle ml is set at the timing corresponding to the package diameter d based on the preset data.
, mt...read out the values of m, Figure 4(a)
- (e)), the punch guide 23 is returned to the predetermined position in P6. Next, at P9, the solenoid valve 34e
Remove the notch (not shown) that fixes the turret table 1 with the cylinder 33 via the cylinder 33, and confirm that the notch has come out (Step P16).
Proceed to , and if it hasn't come out yet, just press P. Wait there.

Furthermore, the turret motor 10 that drives the turret table 1 is started at P. Here, guard motor 1
Sprocket 1 is connected to the 0 axis via a torque limiter 11.
3 is attached to the sprocket 12 which is attached integrally with the turret table 1, and the turret table 1 is rotated by the chain 14 in the direction opposite to the rotation of the bobbin holder 2 (or 3) in FIG. 1 described above (that is, clockwise). . Then, the encoder 30 connected to the turret table 1 rotates, and the rotation angle of the turret table 1 is detected.

Pl! When the rotational speed m reaches a predetermined value A (when m+=A), the speed increase rate H of the winding side bobbin holder with respect to the package diameter d is read out from a predetermined memory at Pl.
(see figure (f)), the reference value R of the winding-side bobbin holder is calculated in accordance with the following equation (0) at PIa.

R = -N-H...■ However, K: Constant N: The frequency of the inverter, which is the power source of the motor 6 that drives the bobbin holder 2 at the bobbin holder rotation speed P1% detected by Ps, becomes f = H. and raise f=H with ptb.
When this happens, the frequency f is held at Pl&+1. Furthermore, the value mt detected by the rotary encoder 30 at PI
When becomes a predetermined value B (mz=]3), the cylinder 22 operates the guide thread removal plate 21 via the solenoid valve 34d at PIs (step P+s).

Then, by the operation of the thread removal plate 21, the traverse cam 18
The yarn that is traversed by the traverse guide 19 that reciprocates while being engaged with a is detached from the traverse guide 19 and formed into the punch guide 23! 23a, and punch-wound at one place in a full package. As shown in Figure 5.6, the yarn punch-wound onto the full package has a contact angle with the surface of the empty bobbin of more than 0° and 30° (preferably more than 0° and 15°), and the PI.

When m3=C, the bobbin holder 3 moves in the R direction as shown in Figure 5.6, so that the groove formed on the bobbin crosses the thread (see Figure 5(c) or Figure 6(C)), (0 ~4 fl is preferred) in the actual direction.

Further, at P2°, the bobbin holder 2 is retracted and the limit switch is turned on, and at P□, it is determined whether or not the retraction is completed. P when retreat is complete.

It is determined whether m,=p. When m, = D, the bobbin holder 2 moves in the opposite R direction and the punch guide moves in the R direction, and the pig till is formed due to the relative speed difference between the bobbin holder 2 and the punch guide 23 (see Figure 7.8). In this way, pz
By executing steps + and pzz, a punch winding is formed on or near the thread gripping groove formed in the empty bobbin 4. The value of D is the time [(sec) for forming this punch winding. Determine whether or not. When m,=E, the thread removal plate 21 returns to its original position during the movement of the bobbin holder 2 in the counter-R direction, and the process proceeds to step P.
, %), After pig till forming is completed, the yarn is gripped by a traverse guide and traversed.

Next, Ptb determines whether m, =F or not, and m6 =F
When this happens, the turret motor 10 stops at pi7.

Furthermore, use pza to push the notch into the groove formed on the outer periphery of turret table 1, and use pzz to insert the notch into the groove.
It is determined whether or not the solimit switch for tz is ON. When the limit switch for input iiH of the notch is turned on, the current process ends.

As described above, in this embodiment, the winding angle between the yarn to be wound on the winding side and the empty bobbin is appropriately set within a range of 30 degrees exceeding O. Therefore, even when switching yarns at a speed of 4000 m/win or more, it is possible to prevent yarn breakage due to straining of the empty bobbin and yarn, and yarn loosening due to a decrease in switching tension (see Figures 14 and 15). ), the switching success rate can be significantly improved from the conventional 80 to 95% to 99.9 to 100%. In particular, 6000m/min
In the above winding, as shown in FIG. 23, the switching success rate was conventionally extremely low at 50 to 60%, but according to the present invention, even at high speed winding, the switching success rate was 99.9 to 10%.
A high switching success rate of 0% can be achieved. Furthermore, it has become possible to obtain a similarly high switching success rate even in a winder with a winding diameter ratio (winding diameter ratio=full winding diameter/empty bobbin diameter) of 4 or more.

In addition to the above-mentioned effects, in this embodiment, the empty bobbin is punched to an appropriate amount (because the punch is formed when the punch is formed, it is possible to improve the switching success rate and the yarn quality of the inner layer, and prevent unwinding defects. be able to.

In other words, since the winding angle between the empty bobbin and the yarn wound on the take-up side can be made smaller, the tension of the yarn on the take-up side can be lowered ('rz /T, ≦2) at the time of switching, and the speed-up time can be reduced. This makes it possible to shorten the yarn length (see FIG. 16), and even if the conventional method would result in a defective yarn, the present invention makes it possible to use the yarn as it is at the time of the turret.

Furthermore, since this embodiment does not require expensive sensors or special components, the method of the present invention can be applied as is to conventional turret-type winding machines, so there is no need to modify the hardware of the device. There is no. In other words, since it is possible to provide the device with only software support, it is possible to avoid complicating the device and increasing costs.

In this example, the empty punch forming time was determined using an encoder signal, but in the winding control shown in FIG. 3, the timer was set by the ON signal of the bobbin holder retraction confirmation limit switch as shown in FIG. In P and P3, the bobbin holder and punch guide may be moved when the timer expires. (However, steps that are the same as the flow in Fig. Only the steps are circled and explained).

In addition, in this embodiment, notch insertion was performed using the Ptb signal, but before the turret motor stops (for example, Pt9, P2□, and Pz4, etc.), the solenoid valve 34e is turned off and the turret is pressed while pressing the notch against the outer periphery of the turret table l. Alternatively, after the turret starts, the speed of the bobbin holder on the winding side is increased, but the turret Before starting,
It can be done at the same time.

Furthermore, although the bobbin holder was moved in the R direction after the yarn and the empty bobbin came into contact, the yarn and the empty bobbin came into contact (see Figure 13) after the bobbin holder was moved in the R direction (see Figure 12). Needless to say, it is also possible to do this (the same applies to the case of large rolls as shown in Figure 12.13).

Furthermore, in this embodiment, the bobbin holder is moved in the axial direction by a cylinder, but the cam groove may be engaged with the fixed portion of the bobbin holder to allow the empty bobbin to move in the axial direction. In this case, the locus of the cam groove and the interval between the two bobbin holders may be set so that the winding angle between the empty bobbin and the yarn is between 0 and 30° between the small winding and the full winding.

(Effects) According to the present invention, the winding angle between the yarn wound on the pancage and the empty bobbin is appropriately set in a range of 30° exceeding Oo, depending on the winding diameter of the full winding or empty bobbin. Since the timing of the axial movement of the bobbin holder (i.e., the turret rotation angle) is changed according to the diameter of the package wound just before switching, a high switching success rate can be achieved for any winding diameter from small to full. By realizing this, it is possible to prevent the generation of defective yarns or defective release of yarns that occurs at the time of switching.

[Brief explanation of the drawing]

1 to 16 are diagrams showing an embodiment of a winding machine to which the control method according to the present invention is applied. 3 is a flowchart showing the winding control program, FIG. 4 is a characteristic diagram showing the rotation angle with respect to the buff cage diameter, FIG. 5 is a diagram showing the switching method, and FIG. 6 is the switching method. FIG. 7 is a diagram showing the switching method, FIG. 8 is a diagram showing the switching method, FIG. 9 is a diagram showing the switching method, FIG. 10 is a diagram showing the switching method, and FIG. 11 is a diagram showing the switching method. Figure 12 is a flowchart showing another aspect of the winding control program, Figure 12 is a diagram showing the switching method, Figure 13 is a diagram showing the switching method, and Figure 14 is a diagram showing the tension when switching to the small winding. Figure 15 is a diagram showing the behavior of the tension when switching to the full volume, Figure 16 is a diagram showing the behavior of the tension when switching to the small volume, Figures 17 to 2
6 is a diagram showing a winding machine to which a conventional control method is applied, FIG. 17 is a diagram showing a switching method for small winding, FIG. 18 is a diagram showing a switching method for small winding, Figure 19 is a diagram showing the behavior of tension when switching to small windings in Figures 17 (a), (b), and Figures 18 (a), (b), and Figure 20 shows the switching method at full winding. Figure 21 shows the switching method at full winding, and Figure 22 shows the tension at full winding in Figures 20 (a), (b) and Figure 21 (a), (b). Figure 23 is a diagram showing the behavior, and Figure 24 is a diagram for explaining the relationship between the wrapping angle θ and the switching success rate.
), (C), FIG.
a), (C), and FIGS. 21(a) and (C) are diagrams showing the behavior of the tension at the time of full-volume switching, and FIG. 26 is a diagram showing the relationship between the punch amount and the switching success rate. 2.3...Bobbin holder, 6...Contact roller, 7...Package, 8.9...Motor, 17.35.36... ...Inverter, 37...
...Microcomputer.

Claims (1)

[Scope of Claims] (1) A plurality of bobbin holders are rotatably protruded from a turret plate, and when a predetermined amount of yarn is wound on one bobbin holder, the yarn is sequentially switched to the other bobbin holder. A yarn winding method using a yarn winding machine in which the rotational direction of the bobbin holder and the rotational direction of the turret table are rotated in opposite directions to each other at the time of switching, wherein the yarn gripping means is A method for controlling a yarn winding machine, characterized in that the timing of gripping the yarn is such that the winding angle between the yarn wound on the package and the empty bobbin is in the range of more than 0 degrees and 30 degrees. (2) The above winding method is a yarn winding device in which the bobbin holder moves in the axial direction when switching the yarn using a yarn gripping means of the bobbin or a yarn gripping means attached to the bobbin holder. The method of controlling a yarn winding machine according to claim 1, characterized in that the timing of the axial movement of the bobbin holder is changed according to the diameter of the package wound immediately before switching. (3) The winding method is such that the time t [sec] from when the yarn gripping means grips the yarn to when the winding device starts forming the pigtail is within the range expressed by the following formula. A method for controlling a yarn winding machine according to claim 1, characterized in that: 0.05≦t≦500000/V・De However, V: Yarn winding speed [m/min] De: Yarn denier [de]