JPS6169669A - Method of collapsing projection on crosswind wound yarn member - Google Patents

Abstract

PURPOSE:To aim at preventing a yarn from being wound in a ribbon winding pattern, and from forming a high projection, by providing such an arrangement, on a diagram of a traverse stroke v.s. time, a phantom line connecting the turning points of traverse motion of the end part of a wound yarn is bent at the turning points. CONSTITUTION:A yarn wind-up bobbin is rotatably supported while a traverse guide carrying out a traverse motion in the axial direction of the bobbin, is coupled to a reversible motion member through the intermediary of a traverse rod, and therefore, the direction of motion of the reversible motion member is changed over to form a cross-wind wound yarn body. Accordingly, a phantom line C connecting the turning points P1, P2... of traverse motion of each end of the wound yarn body gives bent points at the turning points P1, P2. Since the positional variation of the yarn turning point for each stroke becomes larger so that the distance of the turning point adjacent to one end of the yarn wound body, measured in the axial direction of the yarn wound body, is longer than 25% of the distance between the outer end position A of the traverse turning point in the vicinity of the turning point and the innermost end position B of the traverse turning point, the approaching of the yarn for each stroke is prevented, thereby it is possible to avoid winding the yarn in a ribbon winding pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for breaking the edges of a cross-wound yarn, and more specifically, the present invention relates to a method for breaking the edges of a cross-wound yarn, and more specifically, it is a yarn that has a large specific S2 supply like a covering yarn, and has a core portion. The surrounding threads are covered by other threads, and when the ribbon is crushed, it will become taut, and even if the ribbon has not reached the stage of four symptoms, if the threads that connect to G5 on the camellia thread body are close together, the surface threads will form. The present invention relates to a method for breaking the edge of a crosswind thread in a method for forming a crosswind winding body on a bobbin using yarn whose unwinding property is easily impaired due to entangled loops.

(Prior art) When winding a thread on a thread winding bobbin by crosswinding it, that is, winding the thread by intersecting it with the thread inclined with respect to the axis of the bobbin, the thread is wound while rotating the bobbin. swing from side to side using the traverse guide.

The conventional method for f[ing] thread is to rotate a cylindrical cam with a grooved cam around it in one direction using a rotary motor, engage a slider in the groove of the cylindrical cam, and rotate the cam in the axial direction of the bobbin. The slider is fitted into an extending guide groove. Therefore, the unidirectional rotational movement of the cylindrical cam is transferred to the guide 3)
This is converted into the left-right movement of the matching slide, and the yarn is traversed from side to side by a rubber guide attached to the slide.

In the above-mentioned method of swinging the traverse cam from side to side with a cylindrical cam, if the left and right traversing length is constant from the start to the end of winding, a straight sea 1-chief is formed. 35-19710 Publication '7
(Double water and Cτ haru 1 kosara (two-motivated): 11) 1
) From 8% to the end of gluing, gradually reduce the 41y pitch to form a tapered end cheese with both ends slanted at around 1. L
t/',).

In the crosswind method described above, I! Ipposition a on the thread body
When the yarn turns back and ends up with a ribbon-like appearance, or when the direction of the traverse guide changes at both r) 11 parts of the winding body! *Sing p! 2 decrease (2 rI! A selvedge occurs at both ends of the thread, and furthermore, the hardness of the 10 thread increases locally due to the selvedge being pressed by the 7 ri x 1 roller. As a result, the unwinding property of the thread from the Wi thread body is reduced, and the workability in the subsequent process is reduced.

In order to prevent such deterioration in unwinding performance and workability, it is necessary to prevent ribbon winding, selvage height, or an increase in hardness in between areas. As a method of preventing ribbon wrapping, ear iris, or local hardness increase, it has been conventionally known that the position of the shoulder should be avoided in an irregular or conspicuous manner (also known as creeping). (Jikko Sho 35-19)
740, Utility Model Publication No. 45-32784).

However, instead of using a cross wind device, as a parallel wind L'4 for forming a pirt, a traverse guide that swings in the axial direction of the bobbin is connected to an AC nervo motor, DC servo motor, stepping motor, etc. via a traverse rod. It is known to perform a traversing motion by connecting to a forward/reverse moving member and setting the direction of movement of the forward/reverse moving member in the same direction (Japanese Patent Publication No. 43-17634, Japanese Patent Publication No. 49-2395). However, this conventionally known device does not cross-wind cheese. When cheese is cross-winded using this device for one warp, the displacement of the forward-reverse motion member and the traverse distance are substantially proportional, and when the motion speed of the forward-reverse motion member is constant, the traverse speed It remains constant from the beginning of the bush to the spring holly. On the other hand, in the case of the usual winding rate π for cheese formation, the periphery of the winding body is driven by a friction roller at a constant speed. Therefore, when crosswinding is performed using the traverse device using the above-mentioned forward and reverse moving members, the ridge angle of the threads on the surface of the winding body is constant, the threads are parallel, and therefore this winding! In this case, 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 adverse effect on unwinding properties. In addition, in a traverse device using the above-mentioned forward/reverse motion member, a method has been proposed in which the traverse speed is appropriately changed from 1 to lap speed (Japanese Patent Publication No. 4-2395 of 1983). In some cases, the occurrence of ribbon winding can be prevented, but there is a problem in 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 designed for repair, a cam profile that changes extremely rapidly cannot be adopted in consideration of the ability of the cam follower to follow the cam, the rfly 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 too rapidly.

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 difficult to prevent ribbons of the thread, prevent the height of the edges at both ends, and prevent local ripple from increasing by one degree. Sometimes it cannot be measured adequately.

Particularly in the case of a yarn whose core portion is covered with another yarn, such as a covering yarn, when adjacent yarns are located close to each other, the loops of the covered yarns tend to pinch each other. For this reason, it becomes difficult to wind the ribbon six times even when the ribbon has not yet reached the normal state of winding. Also, because the yarn is bulky compared to its fineness,
There is a problem called II1 where high ears are likely to occur.

Means for Solving Problem C) In the present invention, a traverse guide which rotatably supports a yarn winding bobbin and makes Ia swing motion in the axial direction of the bobbin is connected to a reciprocating member via a traverse rod. In the method of forming a crosswind wound body on a bobbin by connecting the forward and reverse movement members to VJ and changing the movement direction of the forward and reverse movement member, the turning of the traverse motion of each end of the winding body on the traverse stroke vs. time diagram. The above-mentioned problem is solved by a method of breaking the ends of the cross-winded thread body by changing the switching timing of the forward/reverse motion member so that the imaginary line connecting the points becomes a bending point at each turning point.

[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. In contrast, in the present invention, a traverse guide that performs traverse movement in the axial direction of the bobbin is connected to a forward/reverse movement member via a traverse rod, and the PI swing movement is achieved by switching the direction of movement of the forward/reverse movement 11 member. I'm letting you do it.

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

Particularly when focusing on one end of the thread, by making the virtual line reach a till (maximum value, minimum value) at each turning point, the turning point position of the traverse movement of the yarn can be can be said to be brought closer to the outermost position of the traverse turning point in the vicinity in one double stroke, moved away in the next double stroke, brought closer in the next double stroke, and moved away in the next double stroke.

Therefore, the selvage can be sufficiently broken, and ribbons can be prevented from being wound.
It is possible to sufficiently prevent the edges from becoming too high at both ends and prevent local hardness from increasing. In particular, even if the core is covered with other yarns such as covering yarn, it is possible to prevent adjacent yarns from being located close to each other, and prevent the covered yarns from sticking to each other. A yarn with a large fineness can be wound without creating a selvage height.

The distance measured in the axial direction of the thread body at the turning point Ia) 1 at one end of the thread body is between the outermost end position of the traverse turning point and the innermost end position of the traverse turning point in the vicinity of the turning point. It is preferable that the distance be 25% or more of the distance of , in order to fully exhibit the ear breaking effect of the present invention. A large percentage means that the change in shape of the virtual line connecting the turning points of the traverse movement is large, and the effect of preventing ribbons is correspondingly large.

Furthermore, the imaginary lines at both ends of the thread body may be asymmetrical 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 thread may be changed for each traverse stroke from the turning point on one end side of the thread 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 value and the minimum value of the traverse linear velocity.

In addition, in the present invention, the imaginary line that defines the turning point of the traverse movement at each end y1 may include a portion that coincides with the outermost position of the traverse turning point.

[Examples] Hereinafter, the present invention will be described in detail based on drawings illustrating embodiments of the present invention.

1 to 3 are strategic perspective views of a winding device embodying the invention, respectively.

The friction roller 1 is connected to a drive source (not shown) so as to rotate at a constant speed.
The yarn winding bobbin 2 is brought into contact with and rotatably supported. A traverse guide 3 that swings in the axial direction of the bobbin 2 is attached to a traverse rod 4, and the traverse rod 4 is connected to an AC servo motor 5 (FIG. 18, FIG. It is connected to the forward/reverse moving member of the cylinder 6'4.

That is, in FIG. 1, a pair of traverse rods 4
are supported reciprocally along guide rails 7, and the pair of traverse rods 4 are connected to each other by a transmission member such as a timing belt 8. The timing belt is stretched around pulleys 9, a pulley 10 is provided coaxially with one of the pulleys 9, and the AC
A pulley 11 is attached to the output shaft of the servo motor 5, and a transmission member such as a timing belt 12 is stretched around the pulley 10, 1111i. However, the AC servo motor 5
The traverse guide 3 can be traversed left and right along the bobbin 2 by switching the direction of rotation.

In FIG. 2, a pair of traverse rods 4 are connected to each other by a bracket, and the bracket 13 is
It is connected to another bracket 15 via 4.

The bracket 15 is suspended between a sliding block 17 which is movable on the guide rail 7 and a block 17 which is movable from side to side along a screw shaft 18.

A transmission member such as a timing belt 12 is stretched between one pulley attached to the end of the screw shaft and a pulley 11 attached to the output shaft of the AC servo motor 5. However,
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 rotor af 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 swung left and right along the bobbin 2.

The present invention provides an apparatus as shown in FIGS. 1 to 3, in which an imaginary line 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 crosswind winding system is broken by changing the switching timing of the forward/reverse motion 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.

Figures 4, 5, and 6 are developed views of the cylindrical surface including the yarn layer on the surface of the winding body at certain points during winding when the traverse linear velocity is constant, and the horizontal axis is If is the direction that fits the circumferential surface of the thread body, therefore.

M! The distance between the L axis L+ and 12 B is the length of the thread diameter multiplied by the circumference. Moreover, lines IA and 1B indicate the outer end position of the traverse turn point scene (the position of the turning point of the maximum traverse when no ear breaking is performed). FIGS. 4 and 5 show the case where selvedge breaking is not performed, and the lines sloping down to the right or up to the right in FIGS. 4 to 6 indicate yarns.

As shown in FIG. 4, if the threads wound around the thread body are spaced apart from each other by 1Wl, ribbon winding will not occur on the surface of the thread 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. The distance measured on the line of the outer end position of the traverse turnaround point between starting from the line of the outer end position of the entourage and returning to the camp at the outer end position of the traverse turnaround point approaches an integer ratio or an integer ratio. The threads are then wound in the same location or in close proximity to form a ribbon wrap. Even in such a case, as shown in Figure 6, by reducing the traverse width and appropriately setting the traverse turning point to the inside of the traverse turning point outer end position, 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 selvedge end of the thread from touching the selvage.

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

In FIG. 7, the pulse generation instructing device 21 is equipped with a trowel for creating 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. 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, is attached to the AC servo motor 5 (Figs. 1 and 2) or the hydraulic cylinder (Fig. 3), and is proportional to the magnitude of the forward/reverse angle of the AC servo motor 5. or generate a number of pulses proportional 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 a 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 driving device W126, and the forward/reverse motion member drive device 26 issues a forward or reverse motion command to the forward/reverse motion member (A).
C servo motor, DC servo motor, stepping motor, hydraulic cylinder) 27 are driven. That is, if the forward/reverse moving member is an AC servo motor, the phase of the power supply is reversed, if it is a DC servo motor, the polarity (positive/negative) of the N source is reversed, and in the case of a stepping motor, the input to the fixed pre-winding wire is reversed. In addition, in the case of a hydraulic cylinder, the supply voltage of pressure oil supplied to the cylinder is reversed.
Switch.

In addition, the symbol @28 is a speed command device, and the forward and reverse motion member (AC servo motor, DC servo motor, stepping motor, hydraulic cylinder) 27 is sent to the forward and reverse motion member drive device 26.
Give a command to change the speed of. A pulse generation instruction is also given to the speed command device 28! The same as 1t21 (!) may be provided with a speed change pattern creation function using a microcomputer.

Reference numeral 29 is a device for detecting the moving speed of the forward/reverse moving member (revolutions per minute for a rotary motor, movement path 12I per minute for a hydraulic cylinder; for example, a known tacho generator may be used). Can be done. Detection BF! 29
The moving speed detected in 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, the speed command device 28 sends the forward/reverse motion member layer 11J installation f! ! ! A command is issued to 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 i* as described with reference to FIGS. 1 to 3, and branches the yarn left and right.

The position of the traverse end of the yarn is determined by the given selvedge diagram,
That is, it changes based on a given change pattern of the position of the turning point of the traverse movement of the yarn. Does this pattern consist of one fixed piece or? ! It can be given so that several patterns are repeated, or it can be given so that it does not have p-law property using a random number table.

As described above, the length of the driver's 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 point of the traverse turning point of a yarn that has an 11:i5 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 taber end cheese). Cotton B is the end position inside the traverse turning point view in the same part. Also, point P+ in the figure
, Pz, . . . are the points of 1 double 1 to Roku (traverse where the traverse guide traverses from one end of the winding body to the other end, and then returns from the other end to the original end) This indicates the turning position of the yarn for each stroke (in other words, the position of the end of the traverse movement). The track C is an imaginary line that crosses the points P+, Pl, . . . above. The line is a line parallel to the axis of the thread.

In the case of straight cheese, the position of mA does not change from the beginning to the end of winding, but in the case of tapered cheese, the traverse stroke decreases as the winding becomes thicker, so it changes from Figure M8 to Figure 15. Although not shown, mA will slope (for example, in Figures 8 to 13, if the left side is the beginning of winding and the time axis is taken to the right, line A will slope upward to the right. ).

On the other hand, IB may be parallel to MA as shown, or may be non-parallel, that is, the distance between the rows A8 may be changed, for example by increasing, depending on the winding time.

In FIG. 8, an imaginary line C connecting turning points P+, P:, .
The distance measured in the axial direction of the thread between adjacent turning points at one end of the thread, i.e.

For example, Pl and Pl! ilD), the distance measured along the line between Pl and P3, and the distance between P3 and Pl.
The distance measured along the line between Pj and P5, the distance measured along the ID between P5 and P6, the i'! between P and P. The distance measured by fixing D is,
Traverse turning point view outer end position H in the vicinity of the turning point
25% or more of the distance between A and the traverse turning point position [8 (distance measured along the line between line A and line 8), and the turning point of the yarn for each double stroke. The change in position is very large.

In the case of Jq where the traverse stroke is constant, even if the yarn has a head such that it forms a ribbon winding as shown in FIG. - By greatly changing the turning point of the lapasing movement, the yarns in each traverse are prevented from coming close to each other, and ribbon winding is prevented. It is difficult to greatly change the turning point of the traverse movement in this way with the conventional l1lfN using a cam. This becomes possible for the first time in a method in which a cross-wind camellia thread body is formed on the bobbin by connecting a traverse guide to the forward and reverse movement via a traverse rod, and switching the direction of movement of the movement direction of the forward and reverse movement assisting member.

In order to make the selvage breaking method of a cross-wound thread body of the present invention even more effective, the coarse stiffness measured in the axial direction of the thread body at an adjacent turning point provided at one end of the thread body must be 30 of the distance between the traverse turnback point view outer end position A and the traverse turnback point view MQ[FlB in the vicinity of the turnaround point
% or more, preferably 40% or more.

In the curved line diagram of the present invention shown in FIG. 9, the curved line diagram shown in FIG. value or minimality).

As a result, the ends of the traversal movement of the yarn, which occur sequentially in time, move closer to or away from IIA from the beginning to the end of the traverse. By changing in this way, the effect of breaking the edges and preventing the occurrence of ribbons of the present invention can be exhibited even more markedly. In addition, in Fig. 9, the yarn traverse movement speed from the lower side to the upper side is fast;
Conversely, the traverse speed from the upper side to the lower side (δ is increasing).

The selvage line diagram shown in Fig. 10 shows a special method of the selvage line diagram shown in Fig. 9 (1), which shows the position of the end of the traverse movement of the yarn for each double I-rubber stroke. f!
When moving the slurry closer to or farther away from the 8th point, the position when the sushi is brought closer is set on the outer end position A of the traverse turnaround scene. It has the advantage of being

The Mimiboshi line diagram shown in Fig. 11 also shows a special method of the Mimiboshi r8 diagram shown in Fig. 9, and Fig. 10 (2 shown;
One method C is the type of yarn, 11 angle, cutting speed, etc. -C is near the line A (although there may be a small 45 mm left in the force: 1 stitch, this ear In this example, from point P1 to point PIQ
Well, the positions of the thread clusters are every other on line A, and from point Pl+ to point P26 is IIi! It is on A', and from the point pz+ to the point Pi2 is again on the side A, and is swept back below. Select an appropriate ratio between the stroke ends on @A and the number of stroke ends on gland A', and also set the slope at which the stroke ends move onto mA and IIA' appropriately. By selecting this, it is possible to prevent the small ear height that may occur in the case of FIG. 1 described above.

The 12th Leap is a further development of Figure 1411,
In addition to #A', there is a profit A" that is different from the 8th place of $IA'.
By introducing this, it is intended to sufficiently prevent even minute ear heights.

FIG.
°When winding the yarn around the seine body, the selvage is broken to prevent the ribbon from being scratched and to prevent the selvage from becoming too high. If the selvedge has a circle or 7 meshes and is A-sized, Part 1: The thread thread tends to come off from the outer circumferential surface of the winding body, causing so-called selvedge removal (also called selvedge, skipped thread, or crossover thread). This may occur.

As a method to prevent such ear dislodgement, there is a method of inserting a part of the ear break that has a continuous length at the position of the turning point of the traverse movement into the traverse turning point 1 outpost or stomach. The ear line diagram shown in the figure is a diagram in which this method is applied to the present invention, and the period from point P9 to point PI3 coincides with the traverse movement-kuvers turn point scene outer end position A and is held constant. ing.

How long should the stroke be to match the outer end MA of the traverse turning point?

The specific conditions for how much M degree to press are
It can be determined by carrying out fruiting after setting various conditions such as 1.

This method may be implemented with any of the selvedge lines shown in FIGS. 8 to 12 described above.

In the above description, C refers to the turning point of the traverse movement in one gap of the thread body, but the turning point at the @ end may be set to be substantially symmetrical to the turning point at the one end.

However, in the present invention, forward and reverse; By changing the switching timing of the moving member, a hypothetical line connecting the turning points of the traverse movement of each end of the winding body on the bare diagram between the driver's suth 1-loaf and rn is set at each turning point. Since the diffraction point is set at 1j, it is always assumed to be f4 symmetric. It is not necessary, and it is possible to make it asymmetric.

Examples of such asymmetrical selvage diagrams are shown in FIGS. 14 and J15. When we adopt an asymmetrical selvage diagram like this, there is not much difference in terms of the effect of preventing the selvage height at both ends compared to the lq case where a symmetrical selvedge diagram is adopted.
Regarding the prevention of ribbon wrapping, there were 21 results and 4 results.
] Ru.

Note that the selvedge line diagram for each end may be used in combination with the selvage line diagrams described above. - As an example, in Fig. 15, the above-mentioned selvage line diagram of Fig. 13 is used at both ends, but when viewed at each point in time, the selvage lines at both ends are asymmetrical. By doing so, it is possible to achieve an effect of preventing ribbon winding and an effect of preventing ear removal at each end.

(Effects of the Invention) In the present invention, the provisional M4 connects the turning points of the traverse motion of each end of the thread body on the traverse stroke versus time diagram by changing the switching timing of the forward and reverse motion members.
1 is a bending point at each turning point, and unlike conventional devices that use cams to change the end of the winding body, the traverse width can be changed rapidly, and the winding When spring is applied to one end of the body, the position of the turning point of the traverse movement of the yarn approaches or coincides with the outer end position of the traverse turning point in the vicinity of that double stroke, and the next double stroke In the stroke, move away, and in the next double stroke, move closer or match,
In the next double stroke, you can move it further away. Therefore, the selvage can be sufficiently broken, and the ribbon of the M thread body, the height of the selvage at both ends thereof, and the local increase in hardness can be sufficiently prevented. In particular, even if 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 yarns from sticking to each other, and it is possible to wind up yarns with a relatively large fineness without creating a selvage height. Further, even when applied to winding elastic yarn, it is effective because ribbon winding and selvage can be prevented while reducing tension changes.

[Brief explanation of the drawing]

Figures 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 thread according to the present invention, and the fourth to sixth factors are when the traverse speed is constant. FIG. 7 is a developed diagram of the cylindrical surface including the thread layer on the surface of the thread body during winding, and FIG.
8 to 15 are selvage diagrams expressed as traverse stroke vs. time diagrams according to the present invention.

Claims (1)

[Claims] 1. A traverse guide that rotatably supports a yarn winding bobbin and makes traverse 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. 1. A method for breaking the edge of a cross-wound yarn body, characterized in that the switching timing of the forward/reverse motion member is changed so that a point becomes an inflection point. 2. The method for breaking the edges of a cross-wound yarn body according to claim 1, wherein the virtual line has an extreme value at each turning point. 3. 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 traverse turning point position A and the innermost traverse turning point position B in the vicinity of the turning point. 3. The method for breaking the edges of a cross-wound thread according to claim 1 or 2, wherein the distance between the threads is 25% or more of the distance between the threads. 4. Claims 1, 2, or 3, wherein the virtual lines at both ends of the thread body are asymmetrical to each other.
The method for breaking the edges of a cross-wound thread body described in Section 1. 5. The crosswind yarn body according to claim 1, 2, 3, or 4, wherein the traverse linear velocity of the yarn is changed by changing the movement speed of the forward/reverse motion member. How to break your ears. 6. The crosswind winding body according to claim 5, wherein the traverse linear velocity of the yarn is changed for each traverse stroke from a turning point on one end side of the winding body to a turning point on the other end side. How to break your ears. 7. The method for breaking the selvage of a crosswind yarn body according to claim 5 or 6, wherein the change in the traverse linear velocity of the yarn is given based on a random number table. 8. The selvage of the cross-wound yarn according to claim 6, wherein the difference in traverse linear velocity between the adjacent traverse strokes is 40% or more of the difference between the maximum and minimum traverse linear velocities. How to break it. 9. A traverse guide that rotatably supports a yarn winding bobbin and makes traverse motion in the axial direction of the bobbin is connected to a forward/reverse motion member via a traverse rod, and the direction of motion of the forward/reverse motion member is switched. In the method of forming a crosswind winding body on a bobbin using a traverse stroke vs. A cross-wind yarn body characterized in that the switching timing of the forward/reverse motion member is changed so that the switching timing of the forward/reverse motion member is changed so as to consist of a portion that coincides with A and a portion that is continuous with the portion and is a bending point at each turning point. How to break your ears. 10. The method for breaking the edges of a cross-wound yarn body according to claim 9, wherein the virtual line of the portion serving as the bending point has an extreme value at each turning point. 11. The distance measured in the axial direction of the winding body between the adjacent turning point at the bending point at one end of the winding body is the distance between the outermost end position A of the traverse turning point in the vicinity of the turning point and the traverse. Claim 9, which is 25% or more of the distance between the turning point and the innermost end position B
10. A method for breaking the edges of a cross-wound thread according to item 1 or 10. 12. The method for breaking the edges of a cross-wound thread body according to claim 9, 10, or 11, wherein virtual lines at both ends of the thread body are asymmetrical to each other. 13. Claim 9, wherein the traverse linear speed of the yarn is changed by changing the movement speed of the forward and reverse movement member.
The method for breaking the edges of a cross-wound thread according to item 10, item 11, or item 12. 14. The crosswind wound body according to claim 13, wherein the traverse linear velocity of the yarn is changed for each traverse stroke from a turning point on one end side of the yarn body to a turning point on the other end side. How to break your ears. 15. The method for breaking the edge of a crosswind yarn body according to claim 13 or 14, wherein the change in the traverse linear velocity of the yarn is given based on a random number table. 16. The selvage of the cross-wound yarn body according to claim 14, 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 the traverse linear velocity. How to break it.