JPH03205268A - Taking up of cross winding type yarn body - Google Patents

Abstract

PURPOSE:To enable the taking-up method in which the high shoulder or hardness increase are not generated on the inside of the creeping area of a cross winding type yarn winding body, by carrying out acceleration to the speed exceeding the stationary traverse speed from the turning-back point and carrying out the return to the stationary traverse speed. CONSTITUTION:A yarn is accelerated at a constant speed from the turning-back point O (time t0) on a traverse speed diagram to a speed S exceeding the station ary traverse speed S1, and the yarn is shifted (between A and B) at a prescribed speed S during the time t2 from the time t1 (point A at the time t1), and the stationary traverse speed S1 is restored (point C at the time t3). Though the speed S can be set at a proper speed, the speed is increased by 2-8% for preventing the high shoulder. Further, the position for returning the speed from S to S1 is set at the position which is close to the center side in the longitudinal direction of a package P by a distance X which is arbitrarity set from the turning-back position Z1 on the innermost side in the creeping area. The distance X is set inside in comparison with the position of a traverse guide where the speed reaches S1, in the case of turning back at the position Z1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for winding up a cross-wound thread, and more particularly to a method for breaking the edges when winding a cross-wound thread.

The present invention can be carried out generally for winding cross-wound threads, but is particularly suitable for winding threads such as covering yarns, which have a relatively large fineness and whose core is covered with other threads. Suitable for taking.

The following will explain the covering yarn as an example.

[Conventional technology]

Covering yarn has a relatively large fineness, and the core is covered with other yarns, so that when winding a ribbon, even when the ribbon is not wound, adjacent yarns on the winding body are covered. If they are placed close to each other, the loops of the surface thread loops will become entangled and the unwinding performance will be impaired.

In order to prevent such a decrease in unwinding performance, it is effective to prevent ribbon winding, and to prevent ribbon winding, it is effective to change the traversing length and break the edges.

However, when traversing with a cam-type traverse device of a conventional crosswind device, which performs traverse by attaching a thread guide to a cam with a spiral groove and a cam follower guided by a cam follower guided by a guide groove inside the spiral groove and a straight axial guide groove, For example, the traverse 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 curved surface 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 thread, it is not possible to change the trapper width 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 determined by the outermost end position of the traverse turning point (during maximum traverse) in the vicinity of the turning point position of the traverse movement of the yarn in a certain double stroke (-reciprocating). approach the turning point position),
You can't move 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 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 yarn tend to stick to each other. For this reason, it becomes difficult to unwind even when the ribbon has not yet reached its normal state. Also, because the yarn is bulky compared to its fineness,
There is a problem in that ear height is likely to occur.

The inventor of the present invention has previously solved these problems, and has developed a method that can sufficiently break the edges, prevent ribbons on the thread body, prevent high edges at both ends, and prevent local hardness increases. In particular, even in the case of a yarn whose 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 it is also possible to prevent the covered yarns from sticking to each other. We have proposed a method that can wind up yarns with extremely large fineness without creating selvage height.

In this method, a traverse guide which rotatably supports a yarn winding revolving 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 moving direction of the forward/reverse moving member is In the method of forming a cross-wound thread body on a bobbin by switching the This is a method of breaking the edges of a cross-winding thread body by changing the switching timing of the forward/reverse moving member (Japanese Patent Application Laid-open No. 69669/1983).

[Problem that the invention seeks to solve]

Generally, at the turning point of traverse interlocking, the traverse speed becomes zero, and is accelerated from there to a steady traverse speed according to a linear or curved speed diagram. During this time,
Although the feeding speed of the yarn is constant, the traverse speed is slower than the steady traverse speed, so the vicinity of the turning point is in an overlapping state and a selvage is formed.

In order to solve this problem,
In the method disclosed in Japanese Patent No. 69, the turning point of the traverse movement is dispersed within the breaking area located between the innermost and outermost switching positions to perform the breaking.

However, according to the research of the present inventor, although the above-mentioned method was able to prevent the formation of ears in the ear-breaking area, On the center side, although smaller than before,
An increase in ear height or package hardness was observed. Due to this partial increase in hardness, the threads of the outer layer may bite into the inner layer, or the package shape may be deformed. This causes problems such as increased yarn tension when unwinding the wound yarn from the package, and yarn breakage due to excessive tension. This effect is particularly noticeable in covering yarns such as spandex.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a method for winding a cross-wound yarn body in which no increase in selvage height or hardness occurs inside the selvedge-breaking region of the cross-wind yarn body.

[Means to solve the problem]

In the present invention, a traverse guide which rotatably supports a yarn winding revolving 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 traverse of the forward/reverse motion member is The innermost switching position is set at the innermost position of the stroke width, and many turning points are arranged between the outermost switching position and the innermost switching position. , the switching timing of the forward/reverse motion member is determined such that the virtual line connecting the turn points of the traverse motion of each end of the thread body on the traverse stroke vs. time diagram is a bend point at each turn point. A method for winding a cross-wind yarn body that changes the speed of the cross-wind yarn body, which is characterized by accelerating from a turning point to a speed exceeding a steady traverse speed, and then returning to a steady traverse speed, Achieving the above objectives.

Particularly, in the present invention, a traverse speed changing position is set further inside the innermost turning position, and when the traverse movement position from the turning point reaches the traverse speed changing position, the speed exceeding the steady traverse speed changes. It is preferable to return to a steady traverse speed.

[For production]

In the present invention, the speed is accelerated from the turning point to a speed exceeding the steady traverse speed, and then the speed is returned to the steady traverse speed, so that the occurrence of a selvage height and an increase in hardness at a position inside the selvage breaking area when viewed in the longitudinal direction of the package is prevented. A package with good winding appearance and good unwinding properties can be obtained.

〔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) so as to rotate at a constant speed, and a thread take-up ribbin 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, and the traverse rod 4 is connected to an AC servo motor 5 (Figs. 1 and 2).
It is connected to forward and reverse moving members such as a DC servo motor, a stepping motor, and a pressure cylinder 6 (FIG. 3).

That is, in FIG. 1, a pair of traverse rods 4
are supported so that they can reciprocate along guide rails 7, and a pair of traverse rods 4 are connected to a timing belt 8.
They are connected to each other by transmission members such as. The timing belt 8 is stretched around a pulley 9.
A pulley 10 is provided coaxially with the AC servo motor 5, 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 the parts 11 and 11. 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 slots 4 are connected to each other by brackets, and the brackets 13 are connected to another bracket 15 via a connecting rod 14.

The bracket 15 is spanned between a sliding block 17 movable along the guide rail 7 and a block 17 movable left and right along the 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 18 and a pulley 11 attached to the output shaft of the AC servo motor 5. Therefore, the rotation direction of the AC servo motor 5 is changed and the screw shaft 18
The traverse guide 3 can be traversed left and right along the bobbin 2 by switching the zero rotation direction.

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.

In the apparatus shown in FIGS. 1 to 3, the imaginary line connecting the return points of the traverse motion of each end of the winding body on the traverse stroke vs. time diagram is, for example, as shown in FIG. Next, the edges of the cross-wound thread are broken by changing the switching timing of the forward/reverse motion member so that each turning point becomes a bending point.

In general, the larger the selvedge width L (that is, the distance between the outermost position S of the traverse turning point of the yarn and the innermost position S1 of the traverse turning point), the greater the ribbon prevention effect. has been confirmed.

Further, according to the inventor's study, the relationship between the selvedge width and the occurrence of twill drop changes depending on the brand of thread to be wound, winding conditions, etc. When it is constant, the rate of change in speed at the turning point of the traverse basically has an effect.

FIG. 4 shows a time-traverse speed relationship diagram, with time on the horizontal axis and traverse speed on the vertical axis.

The conventional traverse speed line shown in Fig. 4 turns around at a traverse turning point, then rapidly accelerates to a predetermined traverse speed, heads to the other traverse turning point at the predetermined traverse speed, then rapidly decelerates and traverses. Turn around at the turning point.

Figure 5 is a package position vs. thread length diagram, with the horizontal axis representing the distance measured from one end surface of the package and the vertical axis representing the winding amount, for a package wound according to the traverse diagram in Figure 4. be.

When the selvedge is broken as shown in Fig. 6, the selvedge height curve shown in Fig. 5 is drawn at each traverse turning point as shown in Fig. 7, and the curves are superimposed. The selvage height of the traverse turning point shown in Fig. 5 is distributed within the selvedge area.

Therefore, a basic traverse pattern is set, turning points are set between the outermost switching position and the innermost switching position of the traverse stroke, and the distribution of each turning point is arranged sufficiently randomly in terms of time. If so, the edge shape of the resulting package is drawn by drawing an edge height curve as shown in FIG. 7 for each folding point and superimposing the edge height curves.

Since the package ear shapes shown in FIG. 7 are formed on the same package, if drawn on the same line as shown in FIG. That is, a minute edge height, such as the shaded area a, is formed closer to the center of the package than the inner switching position.

In order to solve this problem, the present invention employs a traverse speed diagram as shown in FIG. That is, from the turning point O (time 1o), the speed S exceeding the steady traverse speed S1 is accelerated at a constant acceleration (time 11).
Point A) is moved at the speed S for a predetermined time between time t1 and t2 (between AB), and then the steady traverse speed So
(point C at time t3).

Here, the magnitude of the speed S exceeding the steady traverse speed S1 can be set to an appropriate value, but it is preferable to increase the speed S by about 2 to 8% from the steady traverse speed St in order to prevent ear height.

Further, the position where the speed S exceeding the steady traverse speed Sl returns to the steady traverse speed S1 is determined by an arbitrarily set distance Select a position close to the center of the

This distance X is preferably selected to be inside the position of the traverse guide when the steady traverse speed is reached when the traverse is turned back at the innermost turn-back position Z1.

Further, the position on the traverse stroke from the speed S exceeding the steady traverse speed St to the steady traverse speed Sl (point B in Fig. 9) is always a constant position when the winding body is a straight cheese; If the winding body is tapered end cheese as shown in Figure 10, as it is rolled up (as it becomes thicker from the innermost layer to the outermost layer of the package)
, parallel to the tapered portion of the package.

In the traverse speed diagram shown in FIG. 9, the time t
. The speed has increased at a constant acceleration (that is, the speed change rate is constant) from the turning point O to the speed S exceeding the steady traverse speed S1. It may be changed in a curved shape or in a curved shape.

Further, the traverse pattern (OA) from the turning point O to A where the speed S exceeding the steady traverse speed is reached may be always the same, or may be changed as appropriate depending on the turning position.

Furthermore, the turning point O is the innermost turning point (21 in Fig. 10).
), when the speed S exceeds the steady traverse speed S1, the constant speed portion AB may be eliminated and the speed is immediately decelerated to the steady traverse speed St.

〔Effect of the invention〕

In the present invention, the speed is accelerated from the turning point to a speed that exceeds the steady traverse speed, and then the speed is returned to the steady traverse speed, so that it is possible to prevent the shape of the selvedge height and the hardness of the package from increasing in the longitudinal direction of the package than the selvage breaking area. The yarn in the outer layer does not bite into the inner layer, the package is not deformed, there is little tension variation when the yarn is unwound from the package, and yarn breakage is prevented.

[Brief explanation of drawings]

1 to 3 are perspective views of an embodiment of a crosswind device for carrying out the crosswind winding method of the present invention, FIG. 4 is a conventional time-traverse speed relationship diagram, and FIG.
The figure is a package position per winding amount curve, Figure 6 is a selvage line diagram, Figure 7 is a diagram explaining how to draw the selvage height line when selvage is broken, and Figure 8 is the same as Figure 7. FIG. 9 is a traverse speed diagram according to the present invention, and FIG. 10 is a partial front view of Taber end cheese rolled up according to the present invention. 2... Yarn winding ribobin, 3... Traverse guide, 4... Traverse rod, 5... Forward/reverse motion member.

Claims (1)

[Claims] 1. A traverse guide that rotatably supports a yarn winding bobbin and makes a traverse movement 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 Set the innermost switching position at a position inside the outermost switching position of the member's traverse stroke by the selvedge width, and place a number of turning points between the outermost switching position and the innermost switching position. The forward/reverse motion member is arranged so that the virtual line connecting the turning points of the traverse motion of each end of the winding body on the traverse stroke vs. time diagram is a bending point at each turning point. A method for winding a cross-wind yarn body in which the switching timing of the cross-wind yarn body is changed, the winding method of the cross-wind yarn body being characterized by accelerating from a turning point to a speed exceeding a steady traverse speed, and then returning to a steady traverse speed. Method. 2. A traverse speed change position is set further inside the innermost turning point, and when the traverse movement position from the turning point reaches the traverse speed changing position, the steady traverse speed changes from a speed exceeding the steady traverse speed. 2. The method for winding up a cross-wound thread according to claim 1, wherein the cross-wound thread is returned to the original state.