JPH0515628B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for breaking the ends of a cross-wound yarn, and more specifically, the present invention relates to a method for breaking the edges of a cross-wound yarn. The loops of the surface yarns become entangled and unravel when adjacent yarns on the winding body are close together, not only during ribbon winding, but also when adjacent yarns on the winding body are close together. The present invention relates to a method for breaking the edges of a crosswind thread in a method of forming a crosswind thread on a bobbin using yarn whose windability is easily impaired.

[Conventional technology]

When winding a thread winding body on a thread winding bobbin by crosswinding it, that is, winding the thread by tilting the thread with respect to the axis of the bobbin and intertwining it, the thread is moved left and right by a traverse guide while rotating the bobbin. Shake Aya.

A conventional yarn traversing method involves rotating a cylindrical cam with a grooved cam on its circumferential surface in one direction by an electric motor, engaging a slider in the groove of the cylindrical cam, and extending the cam in the axial direction of the bobbin. The slider is fitted into the existing guide groove. Thus, the unidirectional rotational movement of the cylindrical cam is converted into the left-right movement of the slider along the guide groove, and the yarn is traversed left and right by a traverse guide attached to the slider.

In the above-mentioned method of traversing the traverse cam from side to side using a cylindrical cam, if the left and right traversing length is constant from the start to the end of winding, a straight cheese is formed.
As disclosed in Publication No. 19740, etc., a special mechanism is added to gradually reduce the traverse length from the start of winding to the end of winding, thereby creating a tapered end cheese whose both ends are inclined. is formed.

In the above-mentioned cross-winding method, the yarn is repeatedly wound at the same position on the winding body, resulting in ribbon winding that looks like a ribbon, and the twill of the traverse guide at both ends of the winding body. As the traversing speed decreases when the swinging direction changes, a selvage occurs at both ends of the thread, and the selvedge is pressed by the friction roller, causing local hardness of the thread. If it increases, the unwinding property of the yarn from the winding body decreases, and the workability in the subsequent process decreases.

In order to prevent such deterioration in unwinding performance and workability, it is necessary to prevent ribbon winding, selvage height, or local hardness increase. As a method of preventing ribbon winding, selvage height, or local hardness increase, the position of the traversing end is changed regularly or irregularly.
So-called creeping (also referred to as creeping) has been practiced for a long time (Japanese Utility Model Publication No. 19740/1974, Japanese Patent Publication No. 32784/1983).

In addition, it is not a cross wind device, but a parallel wind device for forming a pirn.A traverse guide that traverses in the axial direction of the bobbin is connected to an AC servo motor via a traverse rod.
It is known that a DC servo motor, a stepping motor or the like is connected to a forward/reverse moving member, and a traversing motion is achieved by switching the direction of movement of the forward/reverse moving member (Japanese Patent Publication No. 17634/1989, 49−
Publication No. 2395). However, this conventionally known device is not designed to cross-wind cheese. If this device is used to crosswind cheese, the displacement of the forward-reverse motion member and the traverse distance will be substantially proportional, and if the motion speed of the forward-reverse motion member is constant, the traverse speed will be It remains constant from the beginning of winding to the end of winding. On the other hand, in a typical cheese-forming winding device, the circumferential surface of the winding body is frictionally driven by a friction roller at a constant speed. Therefore, when crosswinding is performed using the traverse device using the above-mentioned forward/reverse motion member, the winding angle of the threads on the surface of the winding body is constant and the threads are parallel. Ribbon winding is likely to occur, and especially when a covering yarn whose core portion is covered with other threads is wound, the ribbon winding has a large negative effect on unwinding properties. In addition, a method has been proposed for appropriately changing the traverse speed in a traverse device using the above-mentioned forward/reverse moving member (Japanese Patent Publication No. 49-2395).
When the traverse speed is changed in this way, the generation of ribbons and the like can be prevented, but there is a problem that the tension of the yarn fluctuates.

[Problem that the invention seeks to solve]

When breaking the selvedge using a conventional crosswind device, the traversing length is changed by changing the inclination of the guide groove with respect to the axis of the bobbin using a cam member such as an eccentric cam. Although the shape of the circumferential surface of the cam can be arbitrarily designed, a cam profile that changes extremely rapidly cannot be adopted in consideration of the ability of the cam follower to follow the cam, the wear resistance of the cam and the cam follower, etc. For this reason, in the conventional method of breaking the edge of a cross-wound yarn body, the traverse width cannot be changed rapidly because the traverse width is too large.

In other words, when focusing on one end of the thread winding body, the turning point position of the traverse movement of the yarn is the outermost position of the traverse turning point in the vicinity (the turning point position of the maximum traverse width) in a certain double stroke. It is not possible to move closer to the object, move it further away with the next double stroke, move closer with the next double stroke, and move further away with the next double stroke.

For this reason, in the conventional method of breaking the edges of a cross-wound thread, it is not possible to break the edges sufficiently, and it is not sufficient to prevent ribbons of the thread, prevent high edges at both ends, and prevent local hardness increases. There are some things that cannot be measured. Particularly in the case of a yarn such as a covering yarn in which the core portion is covered with another yarn, the loops of the covered yarn tend to stick together when adjacent yarns are located close to each other. For this reason, it becomes difficult to unwind even if the ribbon has not yet reached the normal state of winding. Furthermore, since the yarn is bulky relative to its fineness, there is a problem in that selvage height is likely to occur.

[Means for solving problems]

In the present invention, a traverse guide which rotatably supports a yarn winding bobbin and makes a traverse movement in the axial direction of the bobbin is connected to a forward/reverse moving member via a traverse rod, and the forward/reverse moving member is In a method of forming a cross-wound thread body on a bobbin by switching the movement direction, an imaginary line connecting the turn points of the traverse motion of each end of the winding body on the traverse stroke vs. time diagram is formed at each turn point. The above-mentioned problem can be solved by a method of breaking the ends of the crosswind winding body by changing the switching timing of the forward/reverse motion member so that the imaginary line has an extreme value at each turning point. solve.

[Effect]

In the conventional device described above, the traverse guide is moved left and right by a combination of a cylindrical cam that rotates in one direction and a slide that engages with a grooved cam formed on the circumferential surface of the cylindrical cam, thereby traversing the yarn. On the other hand, in the present invention, a traverse guide that makes traverse motion in the axial direction of the bobbin is connected to a forward/reverse motion member via a traverse rod, and the traverse motion is achieved by switching the direction of motion of the forward/reverse motion member. I'm letting you do it.

In the present invention, by changing the switching timing of the forward/reverse motion member, the virtual line connecting the turning points of the traverse motion of each end of the thread on the traverse stroke vs. time diagram becomes a turning point at each turning point. Unlike conventional devices in which the ends of the wound body are changed using cams, the traverse width can be changed rapidly.

Moreover, when focusing on one end of the thread, the virtual line has an extreme value (maximum value, minimum value) at each turning point, and the turning point position of the traverse movement of the yarn can be determined at a certain point. In a double stroke, it can be moved closer to the outermost position of the traverse turning point, in the next double stroke it can be moved away, in the next double stroke it can be moved closer, and in the next double stroke it can be moved further away.

Therefore, the selvage can be sufficiently broken, and the ribbon formation of the thread body, the height of the selvage at both ends thereof, and the local increase in hardness can be sufficiently prevented. In particular, even in the case of a yarn whose core portion is covered with other yarns, such as covering yarn, it is possible to prevent adjacent yarns from being located close to each other, and it is possible to prevent the covered yarns from pinching each other.
It is possible to wind a yarn having a relatively large fineness without creating a selvage height.

The distance measured in the axial direction of the winding body between adjacent turning points at one end of the winding body is the distance between the outermost end position of the traverse turning point and the innermost position of the traverse turning point in the vicinity of the turning point. 25% of
The above conditions are preferable in order to fully exhibit the ear breaking effect of the present invention. A large percentage means that the shape of the virtual line connecting the turning points of the traverse motion remains unchanged,
This increases the ribbon prevention effect accordingly.

Further, the virtual lines at both ends of the thread body may be asymmetrical with respect to each other.

Furthermore, the traverse linear speed of the yarn may be changed by changing the speed of movement of the forward/reverse moving member. In this case, the traverse linear velocity of the yarn may be changed for each traverse stroke from the turning point on one end side of the winding body to the turning point on the other end side. Further, the change in the traverse linear velocity of the yarn may be given based on a random number table. Furthermore, it is preferable that the difference in traverse linear velocity between adjacent traverse strokes is 40% or more of the difference between the maximum and minimum traverse linear velocities.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings illustrating embodiments of the present invention.

1 to 3 are schematic perspective views of a winding device implementing the present invention, respectively.

A friction roller 1 is connected to a drive source (not shown) to rotate at a constant speed, and a yarn winding bobbin 2 is brought into contact with and rotatably supported by the friction roller 1. A traverse guide 3 that traverses in the axial direction of the bobbin 2 is attached to a traverse rod 4.
is connected to forward/reverse motion members such as an AC servo motor 5 (FIGS. 1 and 2), a DC servo motor, a stepping motor, and a hydraulic cylinder 6.

That is, in FIG. 1, a pair of traverse rods 4 are each supported so as to be able to reciprocate along a guide rail 7, and the pair of traverse rods 4 are connected to each other by a transmission member such as a timing belt 8. ing. The timing belt is stretched around pulleys 9, and a pulley 10 is provided coaxially with one of the pulleys 9, and a pulley 11 is attached to the output shaft of the AC servo motor 5. A transmission member such as a timing belt 12 is stretched between them. Thus, the traverse guide 3 can be traversed from side to side along the bobbin 2 by switching the rotational direction of the AC servo motor 5.

In FIG. 2, a pair of traverse rods 4
are connected to each other by brackets, and this bracket 13 is connected to another bracket 15 via a connecting rod 14.

A bracket 15 is suspended between a sliding block 17 movable along a guide rail 7 and a block 17 movable left and right along a screw shaft 18.
A transmission member such as a timing belt 12 is stretched between a pulley 19 attached to the end of the screw shaft 18 and a pulley 11 attached to the output shaft of the AC servo motor 5. Thus, by switching the rotation direction of the AC servo motor 5 and switching the rotation direction of the screw shaft 18, the traverse guide 3 can be traversed left and right along the bobbin 2.

In FIG. 3, the piston rod 6a of the hydraulic cylinder 6 is directly connected to the bracket 13 shown in FIG. By expanding and contracting the piston rod 6a of the hydraulic cylinder 6, the traverse guide 3 can be traversed from side to side along the bobbin 2.

The present invention provides an apparatus as shown in FIGS. 1 to 3, in which a virtual axis connecting turn points of the traverse motion of each end of a winding body on a traverse stroke vs. time diagram is set at each turn point. The edge of the cross-wound thread is broken by changing the switching timing of the forward/reverse moving member so as to form a bending point.

Before specifically explaining the ear breaking method of the present invention, the principle of the present invention will be explained first.

FIGS. 4, 5, and 6 are exploded views of the cylindrical surface including the yarn layer on the surface of the thread body at a certain point during winding when the traverse linear velocity is constant;
The horizontal axis is the direction along the circumferential surface of the thread body, therefore,
The distance between the vertical axes L1 _and L2 is equal to the diameter of the spool multiplied by pi. Further, lines 1A and 1B indicate the outermost position of the traverse turning point (the position of the turning point of the maximum traverse when no selvedge breaking is performed). 4 and 5 show the case where selvage is not performed, and the axes slanting downward to the right or upward to the right in the figures of FIGS. 4 to 6 indicate the threads.

As shown in FIG. 4, if the threads wound around the winding body are spaced apart from each other, ribbon winding will not occur on the surface of the winding body even if the edges are not broken. However, in the process of gradually increasing the winding thickness after starting to wind the thread onto the bobbin, as shown in Fig. 5,
The circumference of the cylindrical surface of the thread winding body and the distance between the yarn starting from the axis at the outermost position of the traverse turning point on one side of the winding body and returning to the line at the outermost position of the traverse turning point on one side of the winding body. When the distance measured on the outermost position line of the traverse turning point approaches an integer ratio or an integer ratio, the yarn is wound in the same place or very close to each other,
A ribbon wrap is formed. Even in such a case, as shown in Figure 6, by reducing the traverse width and appropriately setting the traverse turn point to the inside of the outermost position of the traverse turn point, the yarn may not be wound in the same place or in an emergency. It is possible to prevent the ribbon from being wound close to the ribbon, thereby preventing the formation of ribbon winding.
In addition, by making the turning point of the traverse different from the outermost end position of the traverse, it is possible to prevent the selvage height of the selvedge end of the thread.

Next, a control system for carrying out the method of breaking the edge of a cross-wound thread body according to the present invention will be explained with reference to FIG.

In FIG. 7, the pulse generation instruction device 21 is
It is equipped with a function to create a traverse stroke change pattern using a microcomputer based on a preset pattern of change in the position of the turning point of the traverse movement of the yarn (edge breaking diagram), and instructs the pulse generator 22 to generate pulses. do. The pulse generator 22 generates a large number of pulses when the traverse stroke is long, and a small number of pulses when the traverse stroke is short, in proportion to the traverse stroke.

The pulse generator 24 has a known structure,
It is attached to the AC servo motor 5 (Figures 1 and 2) or the hydraulic cylinder (Figure 3), and the AC
A number of pulses are generated in proportion to the magnitude of the forward and reverse rotation angle of the servo motor 5, or in proportion to the amount of movement of the hydraulic cylinder in both forward and reverse directions.

Pulses generated from the pulse generator 24 and the pulse generator 22 are input to the comparison counter 23 and compared. When the number of pulses input from the pulse generator 24 matches the predetermined number of pulses generated from the pulse generator 22, a signal is transmitted from the comparison counter 23 to the forward/reverse motion command device 25.

As a result, a forward or reverse motion command is issued from the forward/reverse motion command device 25 to the forward/reverse motion member drive device 26, and the forward/reverse motion member drive device 26 causes the forward/reverse motion member (AC servo motor, CD servo motor, Stepping motor, hydraulic cylinder) 27 is driven. In other words, if the forward/reverse motion member is an AC servo motor, the phase of the power supply will be reversed, and the DC
In the case of a servo motor, the polarity (positive and negative) of the power supply is reversed, in the case of a stepping motor, the order of pulses input to the stator winding is reversed, and in the case of a hydraulic cylinder, the supply port of the pressure oil supplied to the cylinder is reversed. Switch.

In addition, the reference numeral 28 is a speed command device, and the forward/reverse moving member driving device 26 is used to control a forward/reverse moving member (AC servo motor, DC servo motor, stepping motor, etc.).
A command is given to change the speed of the hydraulic cylinder) 27. The speed command device 28 also has a pulse generation command device 2.
Similarly to 1, a speed change pattern creation function may be provided using a microcomputer.

Reference numeral 29 is a device that detects the moving speed of the forward and reverse moving member (number of revolutions per minute for a rotary motor, moving distance per minute for a hydraulic cylinder);
For example, a known tachogenerator can be used. The moving speed detected by the detection device 29 is fed back to the forward/reverse moving member drive device 26.

When changing the traverse linear velocity of the yarn for each traverse stroke from the turning point on one side of the yarn traverse movement to the turning point on the opposite side, It is reported that the yarn has reached the turning point, and in response to this, a command is issued from the speed command device 28 to the forward/reverse moving member drive device 26 to change the speed of the forward/reverse moving member 27.

The forward and reverse motion of the forward and reverse motion member is transmitted to the traverse guide 3 by the mechanism described with reference to FIGS. 1 to 3, thereby traversing the yarn from side to side. The position of the traverse end of the yarn changes based on a given selvedge diagram, that is, a given change pattern of the position of the turning point of the traverse movement of the yarn. This pattern is a fixed one
One or more patterns can be given so as to repeat, or it can be given so as not to have any regularity using a random number table.

As described above, the length of the traverse stroke, the position of the turning point of the traverse movement, the traverse linear velocity, etc. can be changed according to the present invention.

Next, some examples of selvage diagrams expressed as traverse stroke vs. time diagrams according to the present invention will be explained. In the figure below, line A is the outermost position of the traverse turning point of the yarn corresponding to the end face shape at one end of the winding body (i.e., the shape of the end face of the winding body such as straight cheese or tapered end cheese). Line B is the innermost position of the traverse turning point in the same section. Also, points P1 _, P2 _,
The points of ... are each a double stroke (a traverse stroke in which the traverse guide traverses from one end of the thread body to the other end, and then returns from the other end to the original end). Indicates the turn-around position, ie, the position of the end of the traverse movement. Line C is an imaginary line connecting the points P1 _, P2 _, . . . above. Axis D is an axis parallel to the axis of the thread body.

In the case of straight cheese, the position of axis A does not change from the beginning to the end of winding, but in the case of tapered end cheese, the traverse stroke decreases as the winding becomes thicker. Although not shown in the figure, axis A will be tilted (for example, if the left side is the beginning of winding in Figures 8 to 12 and the time axis is taken to the right, axis A will rise to the right. ).

On the other hand, the axis B may be parallel to the line A, as shown, or it may be non-parallel, ie the distance between the lines AB may vary, for example by increasing, depending on the winding time.

In Fig. 8, the imaginary line C connecting the turning points P1 _, P2 _, ... of the traverse motion of each end of the winding body is the bending point that reaches the extreme value at each turning point P1 _, P2, and the winding The distance measured in the axial direction of the winding body between adjacent turning points at one end of the thread body, that is, for example, the distance measured along the line D between P1 and P2, and the distance measured along the line D between P2 and P3. ivy distance, P3
The distance measured along line D between and P4, the distance measured along line D between P4 and P5, the distance measured along line D between P5 and P6, the distance measured along line D between P6 and P7. The distance measured along the line D between line A and line B is the distance between the outermost position A of the traverse turning point and the innermost position B of the traverse turning point in the vicinity of the turning point ), which means that the change in the position of the turning point of the yarn for each double stroke is extremely large.

If the traverse stroke is constant, the fifth
Even if the yarn forms a ribbon winding as shown in the figure, by greatly changing the turning point of the traverse movement, the yarn from each traverse is prevented from coming close to each other, and the ribbon winding is prevented. Prevented. In this way, it is difficult to greatly change the turning point of the traverse motion using a conventional mechanism using a cam. This becomes possible for the first time in a method in which a traverse guide is connected to a forward/reverse moving member via a traverse rod, and the direction of movement of the forward/reverse moving member is switched to form a cross-wound thread body on the bobbin.

In order to make the method of breaking the edge of a cross-wound thread body of the present invention even more effective, the distance measured in the axial direction of the winding body between adjacent turning points at one end of the winding body should be The distance should be at least 30%, more preferably at least 40%, of the distance between the outermost traverse turning point position A and the innermost traverse turning point position B in the vicinity.

As shown in FIG. 8, in the selvage diagram of the present invention, the virtual line C has an extreme value (maximum value or minimum value) at each of the turning points P1 _, P2, . . . . As a result, the position of the end of the traverse movement of the yarn, which occurs continuously over time, approaches or moves away from the line A with each double traverse stroke. By changing in this way, the present invention can significantly exhibit the effect of breaking the edges and preventing the occurrence of ribbons. Also, in Figure 8, the speed of yarn traverse movement from the bottom to the top (indicated by the thin lines extending upward to the right from each bending point in Figure 8) is fast (the slope of the thin lines is steep), and conversely The traverse speed on the lower side is slow.

The selvedge line diagram shown in Figure 9 shows a special method of the selvedge line diagram shown in Figure 8, in which the position of the end of the traverse movement of the yarn is brought closer to line A with every double traverse stroke. When moving the member closer to each other, the position when approaching the member is located above the outermost end position A of the traverse turning point, and this method has the advantage that the control of the forward/reverse moving member drive device is simplified.

The selvedge diagram shown in FIG. 10 also shows a special method of the selvedge diagram shown in FIG.
Note that with the method shown in the figure, a small selvage height may remain near line A depending on various conditions such as the yarn type, winding angle, winding speed, etc., and attempts are made to prevent this selvage height. It is something to do. In this example, from point P ₁ to point P ₁₀ , every other yarn end is on line A, and from point P ₁₁ to point P ₂₀ is on line A.
It is on line A′, and from point P ₂₁ to point P ₃₂ is again on line A, and this is repeated thereafter. The number of stroke ends on line A and the number of stroke ends on line A' are selected at an appropriate ratio, and the frequency at which stroke ends appear on line A and line A' is appropriately selected. By doing so, it is possible to prevent the small ear height that may occur in the case of FIG. 9 described above.

Figure 11 is a further development of Figure 10, and in addition to line A', a line A'', which is different from the position of line A', is introduced in order to sufficiently prevent minute heights. be.

In the above description, the turning point of the traverse movement at one end of the thread body has been explained, but the turning point at the other end may be set substantially symmetrically with the turning point at the one end.

However, in the present invention, by changing the switching timing of the forward/reverse motion member, the imaginary line connecting the turning points of the traverse motion of each end of the winding body on the traverse stroke vs. time diagram is set at each turning point. Since it is made to be a point of refraction, it is not necessarily necessary to make it symmetrical, and it is also possible to make it asymmetrical.

When adopting an asymmetrical selvage diagram like this, there is not much difference in the effect of preventing selvage height at both ends compared to when a symmetrical selvage diagram is adopted,
In terms of preventing ribbon winding, excellent effects are achieved.

Note that the selvedge line diagram for each end may be used in combination with the selvage line diagrams described above.

〔Effect of the invention〕

In the present invention, by changing the switching timing of the forward/reverse motion member, the imaginary line connecting the turning points of the traverse motion of each end of the thread winding body on the traverse stroke vs. time diagram becomes a turning point at each turning point, and The imaginary line has an extreme value at the turning point, and unlike conventional devices in which the end of the winding body is changed by a cam, the traverse width can be changed rapidly, and the end of the winding body can be changed rapidly. When paying attention to one end of Furthermore, the next double stroke can bring them closer together or coincide with each other, and the next double stroke can move them further apart. Therefore, the selvage can be sufficiently broken, and the ribbon of the wound body, the height of the selvage at both ends thereof, and the local increase in hardness can be sufficiently prevented. In particular, even when the core is covered with other yarns, such as covering yarns, which are bulky and have many loops, it is possible to prevent adjacent yarns from being located close to each other, and the loops of the covered yarns can be It is also possible to prevent the yarn from picking up, and to wind up a yarn having a relatively large fineness without creating a selvage height. Further, even when winding an elastic material, it is effective because ribbon winding and selvage can be prevented while reducing tension changes.

[Brief explanation of the drawing]

FIGS. 1 to 3 are perspective views of an embodiment of a crosswind device for carrying out the method of breaking the edge of a crosswind wound body according to the present invention, and FIGS. 4 to 6 show a case where the traverse linear velocity is constant. A developed view of the cylindrical surface including the yarn layer on the back side of the thread body at a certain point during winding;
FIG. 7 is a control system diagram for carrying out the method of breaking the edge of a cross-wound thread body according to the present invention, and FIGS. 8 to 11 are curve breaking diagrams expressed as traverse stroke versus time diagrams according to the present invention. . 2... Yarn winding bobbin, 3... Traverse guide, 4... Traverse rod, 5... Forward/reverse movement member,
P1, P2... Turning point of traverse motion, A... Outermost position of traverse turning point of yarn, B... Innermost position of traverse turning point of yarn, C... Imaginary line connecting turning points of traverse movement.

Claims (1)

[Scope of Claims] 1. A traverse guide which rotatably supports a yarn winding bobbin and makes a traversing motion in the axial direction of the bobbin is connected to a forward/reverse motion member via a traverse rod, and the forward/reverse motion is In a method of forming a cross-wound thread body on a bobbin by switching the movement direction of a member, an imaginary line connecting the return points of the traverse motion of each end of the thread body on a traverse stroke vs. time diagram corresponds to each turn. The selvage of the cross-wound thread body is characterized in that the switching timing of the forward and reverse motion member is changed such that the imaginary line has an inflection point at each turning point and the virtual line has an extreme value at each turning point. How to break it. 2. The distance measured in the axial direction of the winding body between adjacent turning points at one end of the winding body is the outermost end position A of the traverse turning point in the vicinity of the turning point.
2. The method for breaking the edge of a cross-wound yarn body according to claim 1, wherein the distance is 25% or more of the distance between the innermost end position B of the traverse turning point. 3. The method for breaking edges of a cross-wound thread body according to claim 1 or 2, wherein virtual lines at both ends of the thread body are asymmetrical to each other. 4. The method for breaking the edge of a crosswind yarn body according to claim 1, 2, or 3, wherein the traverse linear velocity of the yarn is changed by changing the movement speed of the forward/reverse motion member. 5. The crosswind winding body according to claim 4, in which the traverse linear velocity of the yarn is changed for each traverse stroke from a turning point on one end of the winding body to a turning point on the other end side. How to break your ears. 6. The method for breaking the edge of a cross-wound thread body according to claim 4 or 5, wherein the change in the traverse linear velocity of the yarn is given based on a random number table. 7. The selvage of the cross-wound yarn body according to claim 5, wherein the difference in traverse linear velocity between the adjacent traverse strokes is 40% or more of the difference between the maximum value and the minimum value of traverse linear velocity. How to break it.