JPH054305B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for winding yarn;
For example, the present invention relates to a winding method that can be applied to a yarn winding device in a false twisting machine, a DTY machine, etc., or a winding device in a spinning machine.

[Conventional technology]

In false twisting machines, spinning machines, etc., yarn is fed at a constant speed, and this yarn is generally wound into a package in the form of straight cheese or tapered end cheese. In this winding, various winding methods have been proposed in the past in order to keep the thread tension as constant as possible during winding, or to prevent the selvage height of the package or ribbon winding.

For example, in Japanese Patent Application Laid-Open No. 58-176066, the inventor of the present application has proposed a method in which the traverse width is pulsated (so-called creeping), the traverse speed is pulsated at the same period, and the maximum time of the traverse speed and the minimum time of the traverse width are In addition, we proposed to match the minimum traverse speed and the maximum traverse width.

In addition, in Japanese Patent Publication No. 61-38100, in order to reduce fluctuations in yarn tension and prevent ribbon winding,
It has been proposed that when winding a yarn at a nearly constant speed, the traverse speed is varied with a constant amplitude and period, and the winding speed is varied with a constant amplitude and period with the same period as the fluctuation of the traverse speed. .

[Problems that the invention attempts to solve]

In conventionally proposed winding methods, even if the yarn tension during winding can be kept almost constant, high-speed unwinding of the yarn is difficult due to the height of the package edge and ribbon winding. On the other hand, even if it is possible to prevent package cage selvage and ribbon winding, it may not be possible to keep the thread tension constant, or it may be applicable only to winding package cages of a specific shape, or However, the quality and hardness of the package were adversely affected, and it was not possible to obtain a fully satisfactory product.

When yarn is wound by the method disclosed in JP-A-58-176066, the yarn tension can be kept almost constant and the yarn can be wound while preventing the selvage height. Depending on the relationship between the variation pattern and the variation pattern of the traverse width, the effect of preventing ribbon winding may not be sufficient and a state close to ribbon winding may occur. When unwinding a package in which a state similar to ribbon winding has occurred, it is difficult to smoothly draw out the yarn at high speed in the ribbon winding portion, which is a problem.

Furthermore, as disclosed in Japanese Patent Publication No. 61-38100, when winding a yarn at a constant speed, the traverse speed is varied with a constant amplitude and a constant cycle, and the yarn is wound at the same cycle as the variation in the traverse speed. When the take-up speed is varied with a constant amplitude and period, and the yarn is wound without selvage prevention, that is, without changing the traverse width at all, the fluctuation in yarn tension is reduced. However, when the yarn is wound with the traverse width being completely constant in this way, the height of the selvage of the package occurs, which is a problem. When so-called creeping is performed to prevent ear height (i.e., when the traverse width is periodically varied)
However, this was a problem because the tension fluctuation during winding increased.

[Means for solving problems]

According to the present invention, in the method of winding a yarn while pulsatingly changing the traverse width, the traverse width, the number of traverses, and the winding speed are each driven by separate drive devices so that they can be changed independently of each other, The amount of change in the traverse width and the number of traverses are changed so that the magnitude of the composite vector of the horizontal direction vector, which is the product of twice the traverse width and the number of traverses, and the longitudinal vector of the winding speed is approximately constant. The above-mentioned problem was solved by controlling the amount and the amount of change in the winding speed.

[Effect]

Generally, the yarn winding speed is considered to be the winding speed of the winding device (i.e., the circumferential speed of the friction roller or package).
When winding a yarn supplied at a constant speed, such as in a spinning machine, the winding speed is assumed to be constant.

On the other hand, the traverse width and traverse speed are varied in order to prevent the selvage height of the package or ribbon winding. However, according to the inventor's observation, the inventor of the present application
As proposed in Publication No. 58-176066, if a special relationship is established between fluctuations in traverse width and fluctuations in traverse speed, fluctuations in yarn tension can be made extremely small. This causes fluctuations in yarn tension. As a result of intensive research on this point, the inventor of the present application found that the actual winding speed of the yarn is not the winding speed of the winding device itself, and that the movement of the yarn is the lateral movement due to traversing of the yarn and the winding. It has been found that this is a combination of the longitudinal motion due to The traversing speed of the yarn is obtained by multiplying the number of traverses per unit time by twice the traverse width (the number of traverses is counted as one round trip, so multiply by 2). Therefore, the actual winding speed of the yarn is the magnitude of the composite vector of the horizontal direction vector, which is twice the traverse width multiplied by the number of traverses, and the longitudinal direction vector due to winding.

According to the present invention, the traverse width changing mechanism, the traverse guy drive mechanism, and the package drive mechanism in the winding device are each driven by separate drive devices, and the transverse direction vector is calculated by multiplying twice the traverse width by the number of traverses. The amount of change in the traverse width, the amount of change in the number of traverses, and the amount of change in the winding speed are controlled so that the magnitude of the composite vector of The effective winding speed of the yarn becomes almost constant, and fluctuations in the tension of the yarn are reduced.

Furthermore, according to the present invention, the selvage height at both ends of the package cage, which causes fluctuations in unwinding tension, yarn breakage, and staining spots in the subsequent process, can be reduced by pulsatingly changing the traverse width. High incidence is prevented.

Ribbon winding occurs at or near points where the winding angle is approximately constant and the number of revolutions of the package and the number of traverses are in an integer ratio. The inventor of this application is JP-A-58-
As proposed in Publication No. 176066, the winding speed of the winding device is kept constant, the traverse width is made to pulsate (so-called creeping), and the traverse speed (rotational speed of the cylindrical cam) is made to pulse at the same period. When the maximum speed matches the minimum traverse width, and the minimum traverse speed matches the maximum traverse width, the substantial yarn winding speed remains constant as described above. However, since the traverse width and traverse speed are combined in this way, the traverse speed of the yarn is almost constant, and the winding speed of the winding device, that is, the circumferential speed of the package is constant, so the helix angle is It always remains almost constant. Since the winding angle is always almost constant, even if the traverse turning end is varied by creeping, the effect of preventing ribbon winding is insufficient, and ribbon winding is almost the same at points where the number of rotations of the package cage and the number of traverses are an integer ratio. state.

According to the present invention, the winding speed is varied, the traverse width and the traverse speed are varied, and a vector is created in which the horizontal direction vector obtained by multiplying the traverse width and the number of traverses matches the longitudinal direction vector of the winding speed. Since the size is regulated to be approximately constant, the helix angle fluctuates and is not constant. Therefore, even when the number of rotations of the package and the number of traverses are in an integer ratio, ribbon winding is unlikely to occur.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the drawings.

1 and 2 are perspective views each showing a winding device for carrying out the method of the invention. The winding device shown in FIG. 1 is suitable for winding straight cheese, and the winding device shown in FIG. 2 is suitable for winding tapered end cheese.

The motor 1 is a drive device for a traverse guide drive mechanism, and is capable of changing its rotational speed. The traverse guide drive mechanism includes a cylindrical cam 3 with a cam groove 4 connected to the output shaft 2 of the motor 1, a rod 5 movable parallel to the axis of the cylindrical cam 3, and a rod 5 attached to the rod 5 and engaged with the cam groove 4. It consists of a cam follower 6 that fits together, and a traverse guide 8 provided at the tip of an arm 7 fixed to the rod 5. The traverse guide 8 reciprocates to traverse the yarn. Therefore, by changing the rotational speed of the motor 1, it is possible to change the number of traverses per unit time, that is, the number of reciprocations of the traverse guide 8.

The motor 11 is a drive device for a traverse width changing mechanism, and has an eccentric disk cam 13 attached to an output shaft 12 of the motor 11, which can be rotated in forward and reverse directions and can change the rotation angle and rotation speed. A rotating shaft 16 is rotatably supported by a boulder 15 fixed to the machine base, and a slider stand 17 is fixed to the rotating shaft 16. A slider 18 is slidably fitted into the slider base 17.
is connected to the traverse guide 8 via a link 19. Further, a cam follower 14 is rotatably supported at one end of the slider stand 17.

In the winding device shown in FIG. 1, the cam follower 14 is always in rolling contact with the outer periphery of the eccentric disc cam 13.

In the winding device shown in FIG. 2, a substantially triangular cam plate 20 is connected to the tip of an arm 25 that supports a bobbin 24 via a pin 26, and this cam plate 20 is connected to a cam follower 14 and an eccentric disc cam. It is sandwiched between 13 and 13.

Therefore, in the winding device shown in FIGS. 1 and 2, the rotation of the eccentric disc cam 13 changes the inclination angle of the slider base 17, and as a result,
The traverse width of the traverse guide 8 changes.
When the eccentric disc cam 13 rotates forward and backward within a certain angle range, creeping is performed to prevent the height of the ears. That is, by changing the rotation speed or rotation angle of the motor 11, the traverse width can be changed with any desired creeping pattern.

In addition, in the winding device shown in FIG. 2, as the package Y on the bobbin 24 becomes thicker, the arm 25 swings in the direction of arrow A, and the cam plate 20 connected thereto moves, resulting in a slider stand. The inclination angle of 17 changes gradually. Therefore, the traverse width gradually decreases and the cheese can be rolled up into a tapered end cheese shape.

The motor 21 is a drive device for a package drive mechanism, and is capable of changing its rotational speed. The package drive mechanism consists of a friction roller 23 connected to an output shaft 22 of a motor 21. The bobbin 24 is rotatably supported at the tip of an arm 25 that is swingable about its base end. The friction roller 23 contacts the outer periphery of the bobbin 24 or the yarn wound around the bobbin 24 to rotate the bobbin 24 . As the package Y on the bobbin 24 becomes thicker, the arm 25 swings in the direction of arrow A. By changing the rotational speed of the motor 21, the circumferential speed of the friction roller 23 or the package, that is, the winding speed can be changed.

Each of the motors 1, 11, and 21 can rotate independently, and their rotation is controlled by a control device 30.
controlled by.

The control device 30 has a computer, and electrically controls each motor so that the substantial winding speed of the yarn is constant in order to equalize the yarn tension. In other words, the motors 1, 11, and 2 are controlled so that the magnitude of the vector that is the sum of the horizontal vector, which is the product of twice the traverse width and the number of traverses, and the vertical vector of the take-up speed is approximately constant.
Control the rotation speed of 1.

If the traverse width is L, the number of traverses (not necessarily an integer) is T, and the winding speed is V, the yarn traverse speed is 2L x T, so the actual yarn winding speed is [ V ² + (2L×T) ² ] ^1/2 . In order to make the thread tension uniform, this value may be controlled to be approximately constant.

In this case, it is essential to pulsatically change (creep) the traverse width L in order to prevent the height of the sag.

Furthermore, the winding angle is expressed as tan ^-1 (2L×T)/V, and changing this winding angle, that is, (2L
By changing the value of ×T)/V, ribbon winding can be prevented. Therefore, it is necessary to vary the traverse width L and simultaneously vary both the number of traverses T and the winding speed V. Further, although the traverse width L always changes little by little due to creeping, it is preferable to avoid the same winding angle repeatedly at the same position on the package.

For example, if the average winding speed is determined, when the traverse width is maximum, the number of traverses is set to the maximum and the winding speed is set to the minimum, while when the traverse width is the minimum, the number of traverses is set to the minimum and the winding speed is set to the minimum. If it is set to the maximum, the change in winding angle can be made the largest. However, when this combination is applied to winding straight cheese, the helix angle is always tan ^-1 (2L _nax × T _nax )/V at both ends of the creeping, i.e. at the maximum and minimum traverse width positions, respectively. _nio and tan ^-1
(2L _nio × T _nio )/V _nax , so there is no change at the same winding position on the package.
The effect of preventing ribbon winding will be reduced.

Therefore, in order to enhance the effect of preventing ribbon winding, as shown in FIG. It is preferable to make a slight change in the change rate (e.g., speed of change, etc.).

Considering the above points, in order to satisfy the relational expression of traverse width, number of traverses, and winding speed: [V ² + (2LxT) ² ] ^1/2 = constant, first determine which of V, L, and T. It is convenient to determine one variation and then determine the rest by calculation. For example, the number of traverses and the winding speed may be determined after first determining the variation in the traverse width.

Furthermore, once the fluctuation pattern and fluctuation period of two of the three factors, traverse width, number of traverses, and take-up speed, are determined, [V ² + (2L×T) ² ]
Based on the relationship that the value of ^1/2 is approximately constant, the fluctuation pattern and period of the remaining one factor are also determined by calculation. Note that the fluctuation period is the time interval from the start of an increase or decrease to the start of the next increase or decrease in a fluctuation pattern of increase or decrease.

In this way, there are a number of concrete methods that can be used to enhance the effect of preventing ribbon winding.
Typical examples are as follows.

If the periods (time intervals) of two factors are each constant, and the fluctuation pattern in each period is a constant pattern, by making the periods (time intervals) of the two factors different from each other, the remaining one The period of one factor is also different from the period of the other two factors, and the timing of fluctuations is shifted.

If the periods (time intervals) of the two factors are each constant and the periods of both are made to match,
The period of the remaining one factor also matches. As a countermeasure against this, the fluctuation pattern of one of the at least two factors is changed every cycle, and the fluctuation pattern of the remaining one factor is also changed every cycle. For example, when changing the creeping pattern (i.e. traverse width) for each creeping, even if all cycles are synchronized, the winding angle at the same winding position can be changed, increasing the effect of preventing ribbon winding. be able to.

The periods (time intervals) of the two factors are each constant, but the periods of the two do not match, and furthermore,
The variation pattern of one of the at least two factors is changed every cycle, the cycle of the remaining one factor is made different from the cycle of the other two factors, and the variation pattern is also changed every cycle.

The period (time interval) of at least one of the two factors is not kept constant, but the time interval of each period is changed. As a result, the fluctuation pattern also changes every cycle, and the cycle of the remaining one factor is not constant, and the fluctuation pattern also changes every cycle.

To change the fluctuation period and fluctuation pattern, you can store a random number table in the control device in advance and use that, or you can generate pseudo-random numbers within the control device and use that. good.

In addition, the fluctuations in the traverse width, the number of traverses, and the winding speed from the start to the end of package winding are calculated in advance, and the results are input into the control device, and each motor is controlled accordingly. 1, 11, and 21 may be controlled.

Alternatively, each of the fluctuation factors of the traverse width, the number of traverses, and the winding speed can be input as data into the condition setting device of the control device, and the values at each moment of two of the traverse width, the number of traverses, and the winding speed can be inputted as data. may be calculated from the data, and the remaining one may be calculated by a computer from the above relational expression. For example, the traverse width and the number of traverses are first calculated from the data, and the winding speed is calculated from the relational expression. Then, each motor 1, 11, and 21 may be controlled based on the calculation result.

Regarding the traverse width, the fluctuation factors input to the condition setting device of the control device include the amount of creeping, the creeping period, the creeping pattern,
In the case of tapered end cheese, these are the taper angle, time change, random number for timing shift, etc., and the number of traverses is the standard number, maximum value, minimum value, period, time change, random number for timing shift, etc. The speed is a standard winding speed, a maximum value, a minimum value, etc.

Note that, in reality, the value of the relational expression [V ² +(2L×T) ² ] ^1/2 (that is, the actual winding speed) does not have to be strictly constant, but only needs to be approximately constant. In addition, the value determined by the above relational expression only needs to be approximately constant over a certain time period of the winding time from the start of winding to the end of winding, and the value obtained by dividing the total winding time into several time periods in advance Keep it
The value determined by the above relational expression for each time period may be made different, and the winding tension may be changed depending on the winding diameter of the package.

In addition, in the case of tapered end cheese, the change in traverse width is not only due to creeping to prevent the edge height, but also because the winding width gradually becomes smaller as the winding diameter increases. is larger than the change in traverse width due to creeping. Therefore, in winding tapered end cheese, in order to keep the substantial winding speed of the yarn constant, the number of traverses or the winding speed, or both, must fluctuate more than when winding straight cheese. In other words, in order to compensate for the decrease in the winding width of tapered end cheese, it is necessary to increase either the number of traverses or the winding speed, or both. greater than the width variation. In the case of tapered end cheese, even if the winding tension is somewhat reduced when winding the outer layer of the package than when winding the inner layer, high-speed unwinding in the subsequent process is possible.

In the illustrated embodiment, the method of the present invention is applied to a friction drive type winding device, but the winding method of the present invention can also be applied to a spindle type winding device.

〔Effect of the invention〕

According to the present invention, the traverse width changing mechanism, the traverse guide drive mechanism, and the package drive mechanism in the take-up device are each driven by separate drive devices, and a transverse direction vector obtained by multiplying twice the traverse width by the number of traverses is provided. The amount of change in the traverse width, the amount of change in the number of traverses, and the amount of change in the winding speed are controlled so that the magnitude of the composite vector of The effective winding speed of the yarn becomes almost constant, and fluctuations in the tension of the yarn are reduced, and the selvage height at both ends of the package is prevented by pulsatingly changing the traverse width.

Further, according to the present invention, the winding angle always varies and is not constant, so that ribbon winding does not occur even when the number of rotations of the package and the number of traverses are in an integer ratio.

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views of a winding device for carrying out the method of the present invention, and FIG. 3 is a graph showing the relationship between the traverse width, the number of traverses, and the winding speed. 1, 11, 21...Motor, 8...Traverse guide, 13...Eccentric disk cam, 14...Cam follower, 20...Cam plate, 24...Bobbin, 23...
Friction roller, 30...control device.

Claims (1)

[Claims] 1. In a method of winding a yarn while pulsatingly changing the traverse width, the traverse width, the number of traverses, and the winding speed are each driven by separate drive devices so that they can be changed independently of each other. ,
The amount of change in the traverse width and the number of traverses are changed so that the magnitude of the vector that is the result of the horizontal vector multiplied by twice the traverse width and the number of traverses and the longitudinal vector of the winding speed is approximately constant. A yarn winding method characterized by controlling the amount of change in winding speed and the amount of change in winding speed. 2. The yarn winding method according to claim 1, wherein the amount of change in the winding speed is controlled after determining the amount of change in the traverse width and the amount of change in the number of traverses.