JPH04217557A - Yarn winding method - Google Patents

Abstract

PURPOSE:To provide such a yarn winding method that avoids any critical winding number coming to a problem awaiting solution in particular and makes the effect of a ribbon reducible to the utmost, in a winding method of yarn, making a conical package contact with a traverse drum provided with a traverse groove on the surface. CONSTITUTION:A reference winding diameter of a conical package P with a traverse drum 1 is shifted in the axial direction, through which package rotational frequency is suddenly reduced, passing through a critical wind number in a short time, and after passing, the reference winding diameter D of the conical package P is restored to the original one.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a yarn winding method in which a cone-shaped package is brought into contact with a traverse drum having traverse grooves carved on its surface. This invention relates to a method for winding thread to prevent the occurrence of tangles.

0002

2. Description of the Related Art First, a winding device using a traversing drum will be explained with reference to FIG. FIG. 8(a) is a front view, and FIG.
(b) is a side view. Reference numeral 1 denotes a traverse drum, on the surface of which a reciprocating helical traverse groove 2 is cut, and the yarn Y is guided by this traverse groove 2 and reciprocates. 3 is a conical bobbin, on which the thread Y is wound to form a cone-shaped package P. 4 is a cradle arm that rotatably supports the bobbin 3, and one side 4A of the cradle arm is rotatable in the {circle around (2)} direction. Reference numeral 5 designates a swinging arm, the tip of which is integrated with the cradle arm 4, and swings in the {circle around (2)} direction about a shaft 6 as the cone-shaped package P is formed.

In the winding device using the traverse drum 1 described above, when the traverse drum 1 rotates, the yarn Y reciprocates, the cone-shaped package P that rolls into contact rotates, and the yarn Y is wound up. By the way, although the circumferential length of a cone-shaped package differs in the axial direction, the contact pressure in the axial direction is usually the same, so A near the center is the standard drive diameter, and the circumferential speed of this standard drive diameter A is This corresponds to the circumferential speed of the traversing drum 1. In this way, when the reference drive diameter A is at a constant position in the axial direction,
When the yarn is traversed regularly, the traverse angle during winding is constant. In this winding method with a constant winding angle, when the number of winds reaches a certain value, a ribbon is generated in which the wound threads pass through the same location and overlap. This ribbon is used for vibration of the traversing drum (
This can cause problems such as a part of the package becoming high due to the overlapping of the yarns and hitting the traversing drum), or the overlapping yarns becoming a lump and falling out when the yarns are unwound.

This ribbon generation will be explained with reference to FIG. For convenience of explanation, I will explain using a cheese-like package. rectangle 20
is the development of the package in the circumferential direction, and the locus 21 of the yarn is shown on this development surface. Here, D is the winding diameter of the package (corresponding to the standard drive diameter), S is the stroke, WA is the winding angle, and πDtan WA indicates the distance that the yarn travels during one rotation of the package. If the trajectory of the first rotation of the thread is 21a, the trajectory of the second rotation is 21b, reaches the upper right corner of the package development surface, and is reversed to become a trajectory 21c shown by a dotted line. In FIG. 9, the threads draw trajectories that overlap at the same location, resulting in a so-called ribbon generation state. In order to analyze such ribbon generation, the wind number WN, which represents how many times the thread turns back during a single stroke S, is used.
=S/(π×D×tan WA) is used.

In the case of FIG. 9, WN=2, which means that the package rotates twice while the thread advances S. When this WN becomes an integer value X, a ribbon is generated. In the graph of the number of winds and the reference winding diameter in FIG. 10, winding with a constant winding angle is represented as one hyperbola. Therefore, when trying to obtain the maximum reference drive diameter Dmax from the initial reference drive diameter Do, if the wind number WN is an integer value,
The dangerous wind number will be crossed and a ribbon will occur. Note that the ribbons do not only overlap after one reciprocation as shown in FIG. 9, but also may overlap every two or three reciprocations. In such a case, for the integer value X of the wind number WN, X/1 (one round trip), X/2 (two round trips), X/3
,...X/n, and the number of dangerous winds is not limited to integers but is infinite. However, as the denominator n of X/n increases, the degree of overlapping of the threads naturally decreases, so the influence of the critical wind number, where the wind number WN is an integer value such as 2, is greatest.

Conventionally, as a method for winding yarn to avoid such a ribbon, turning on and off the drive of the traversing drum 1 as shown in FIG.
A disturb method is known in which the rotation ratio of the package P and the traversing drum 1 is varied by F to scatter the ribbon. As shown in FIG. 10, as the rotation ratio between the package and the traversing drum changes, the number of winds also changes regularly, and the passage of a critical number of winds, such as an integer value, is divided into multiple passes and the ribbon is scattered.

[0007]

In the yarn winding method using the disturb method described in the prior art, although the yarn is divided into many times, it always passes through a critical wind number such as an integer value. In particular, the ribbon in question has a dangerous wind number of 2.
This is a case of an integer value such as , and there is a problem that the influence of the ribbon generated by passing through this cannot be completely eliminated.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to roll a cone-shaped package onto a traverse drum having traverse grooves. It is an object of the present invention to provide a method for winding a yarn that is brought into contact with the ribbon, in which the number of dangerous winds, which is a particular problem, can be avoided and the influence of the ribbon can be minimized as much as possible.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the yarn winding method of the present invention involves rolling a cone-shaped package into contact with a traversing drum having traverse grooves carved on its surface. In the winding method, by shifting the standard drive diameter of the cone-shaped package relative to the traversing drum in the axial direction, the package rotation speed is suddenly changed to pass the critical wind number, and after passing, the standard drive diameter of the cone-shaped package is changed. It is something to restore.

0010

[Operation] By rapidly changing the package rotational speed, the critical wind number, which is particularly problematic, can be passed in a short time.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a method of shifting the reference drive diameter of a cone-shaped package in the axial direction will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows a cone-shaped package P viewed from directly above. In order to shift the reference drive diameter in the axial direction, the cone-shaped package P is tilted within a horizontal plane. Therefore, the fulcrum 7 of the swing arm 5 is a spherical surface, and the cylinder 8 is attached to the side surface of the swing arm 5. The state shown in FIG. 1(a) is normal, and the reference driving diameter of the cone-shaped package P with respect to the traversing drum 1 is at position A. As shown in FIG. 1(b), when the cylinder 8 is extended and the swinging arm 5 is suddenly tilted by an angle α in the horizontal plane, the axis of the traversing drum 1 and the axis of the cone-shaped package P also intersect in the horizontal plane. , the reference drive diameter moves to position B. Since the reference drive diameter of B is large, the package rotational speed suddenly changes in the decreasing direction. Then, when the cylinder 8 is gradually shortened to its original size, the reference drive diameter gradually shifts from B to A, and the package rotational speed also gradually returns to its original value.

FIG. 2 shows a case where the package rotational speed is suddenly changed in an increasing direction or a decreasing direction, with FIG. 2(a) being a top view and FIG. 2(b) being a side view. The cradle arm 9 is supported on both sides, and is swingably attached to a base portion 11 with some play at its center point 10. and,
Contact pressure adjustment cylinders 12A are attached to both arms of the cradle arm 9,
12B, so that the contact pressure of the cone-shaped package P against the traversing drum 1 can be adjusted separately for the left and right sides. When the contact pressure adjustment cylinder 12A is suddenly pressurized, A
The nearby reference drive diameter shifts to part B, and the package rotational speed suddenly changes in the decreasing direction. Further, when the pressure in the contact pressure adjustment cylinder 18A is gradually released, the package rotational speed gradually returns to the original value. Conversely, when the contact pressure adjustment cylinder 18B is suddenly pressurized, the standard drive diameter shifts to the C portion, and the package rotational speed suddenly changes in the increasing direction.

Next, a method of winding yarn by shifting the reference drive diameter shown in FIG. 1 or 2 in the axial direction will be described. Figure 3
is the dangerous wind number 3. 5, 3, 2. 5, 2, 1.
A characteristic curve of the wind number WN and the reference drive diameter D in the case of avoiding 5.1 is shown. For example, the number of dangerous winds is 3.
．． If the rotational speed of the package is rapidly reduced before 5, the winding speed is suddenly reduced, the winding speed suddenly moves from point a to point b, and the critical wind number 3.5 is passed in a short period of time. Then, when the package rotational speed is gradually returned to the original value, the package gradually moves from point b to point c. By repeating the above steps, the dangerous number of winds can be avoided. The movement from point a to point b will be explained in more detail. The standard driving diameter D of the package is expressed as D=YS/π×B. Here, YS is yarn speed and B is package rotation speed. Substituting this formula into the formula for the wind number WN mentioned above, we get
Wind number WN=(S×B)/(tan WA×YS)
Therefore, when the package rotation speed B is reduced, the wind number also becomes smaller.

FIGS. 4 to 6 are diagrams showing other winding methods, in which the dangerous number of winds 2 is avoided. In FIG. 4, when the package rotation speed is gradually increased before the critical wind number 2, the package gradually moves from point d to point e. Then, when a certain speed is reached, the package rotational speed is suddenly reduced and returned to the original speed, and the package suddenly moves from point e to point f, passing through the critical wind number 2 in a short time. In Figure 5, if the package rotation speed suddenly increases as the critical wind number approaches 2,
If you suddenly move from point h to point h and maintain that position for a certain period of time, you will gradually move from point h to point i. Then, just before the dangerous wind number 2, if the package rotation speed is suddenly returned to its original value,
It suddenly moves from point i to point j and passes through the dangerous wind number 4 in a short time. In FIG. 6, when the package rotational speed is suddenly reduced before reaching the critical wind number 2, the package suddenly moves from the k point to the l point and passes through the critical wind number 2 in a short time. If it is maintained as it is for a certain period of time, it will gradually move from point l to point m. Then, when the package rotational speed is suddenly returned to its original value, the package suddenly moves from point m to point n and returns to the original rotational speed. As in the case of FIG. 5 or FIG. 6, there is also a winding method that avoids the dangerous number of winds by a sudden change due to a combination of a sudden increase and a sudden decrease in the package rotational speed.

FIG. 7 is a diagram showing a combination with other ribbon avoidance methods. The method of the present invention is combined with a disturb method in which the rotation ratio of the package and the traverse drum is varied by turning on and off the drive of the traverse drum to scatter the ribbon. In other words, the number of dangerous winds that have the most serious effect (2 in the illustrated example) can be avoided by the method of the present invention (rapid deceleration from point o to point p, gradual return from point p to point q), and other dangers can be avoided. The number of winds is scattered by disturbance.

By the way, as the standard driving diameter of the package increases, the dangerous wind number is passed, so it is necessary to detect when the dangerous wind number is approached. An example of the detection method will be explained. In FIG. 2(b), as the standard drive diameter of the package increases, the cradle arm 9 swings in the {circle around (2)} direction. By measuring this swing angle with the sensor 13, the package standard drive diameter D is known, and the number of winds WN can be calculated using the above-mentioned formula WN = S/(π x D x tan WA) (stroke S, The winding angle WA is constant). Therefore, for example, in FIG. 2, if the swing angle of the cradle arm 9 is measured by the sensor 13,
The wind number WN can be calculated, and the timing for abruptly changing the package rotation speed can be determined.

[0018]

Effects of the Invention In the yarn winding method of the present invention, a cone-shaped package is rolled in contact with a traverse drum having traverse grooves carved on its surface. By shifting the standard drive diameter of the cone-shaped package in the axial direction, the package rotation speed is suddenly changed to pass the dangerous wind number, and after passing, the standard drive diameter of the cone-shaped package is returned to the original value, which is a particularly dangerous problem. Since the passing time of the number of winds is reduced, the number of ribbons near the critical number of winds can be extremely reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a method of shifting the standard drive diameter of a cone-shaped package in the axial direction.

FIG. 2 is a diagram showing a method of shifting the standard drive diameter of a cone-shaped package in the axial direction.

FIG. 3 is a graph diagram showing the yarn winding method of the present invention.

FIG. 4 is a graph diagram showing the yarn winding method of the present invention.

FIG. 5 is a graph diagram showing the yarn winding method of the present invention.

FIG. 6 is a graph diagram showing the yarn winding method of the present invention.

FIG. 7 is a graph diagram showing a combination of the yarn winding method and the disturb method of the present invention.

FIG. 8 is a diagram showing a winding device using a traversing drum.

FIG. 9 is a developed view of a bobbin showing ribbon generation.

FIG. 10 is a graph diagram showing a conventional winding method.

[Explanation of symbols]

1. Twill drum D Standard drive diameter P Cone-shaped package WN Number of winds

Claims (1)

[Claims] Claim 1: In a yarn winding method in which a cone-shaped package is brought into contact with a traverse drum having traverse grooves carved on its surface, the reference driving diameter of the cone-shaped package relative to the traverse drum is shifted in the axial direction. A yarn winding method characterized in that the package rotation speed is suddenly changed to pass a critical wind number, and after passing, the standard drive diameter of the cone-shaped package is returned to the original value.