CN1157321C

CN1157321C - Spinning take-up machine for elastic silk and silk-changing method thereof

Info

Publication number: CN1157321C
Application number: CNB97120215XA
Authority: CN
Inventors: 桥本欣三
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 1996-12-16
Filing date: 1997-11-06
Publication date: 2004-07-14
Anticipated expiration: 2017-11-06
Also published as: JP2917947B2; EP0847952A1; CN1185404A; JPH10167573A; DE69735326D1; KR19980063557A; DE69735326T2; EP0847952B1; TW414201U; KR100400098B1

Abstract

To provide a take-up winder for elastic yarn that can reliably transfer yarn using a simple structure, and that can remove unwanted yarn resulting from yarn-transferring without damaging a package. A take-up winder for elastic yarn comprises bobbin holders; a touch roller; a traversing device; a turret; and a yarn guide. The yarn guide releases yarn Y wound around a package P from the winding width to reduce yarn tension in order to loosen the yarn Y, and using the reducing yarn tension, elastic yarn is reliably wound around the empty bobbin Be from the full one. In this way, the essential control device can be saved during yarn transfering.

Description

The conversion method of spinning take-up machine that elastic yarn is used and silk thereof

Technical field

The present invention relates to the spinning take-up machine that elastic yarn is used, it is provided with seat of reel, contact cylinder, seal wire traverse range device, seat of reel place-exchange mechanism, when package becomes full volume, make the seat of reel of full package side carry out place-exchange, thereby silk is transformed on the bare bobbin with the seat of reel that is provided with bare bobbin.

Background technology

The spinning take-up machine that this elastic yarn is in the past used generally is the turntable type spinning take-up machine, and it is to make the rotary table plate revolution that 2 seat of reel are housed and carry out the seat of reel place-exchange, when package becomes full volume silk is transformed into continuously and batches silk on the bare bobbin.On this spinning take-up machine, shown in Fig. 2 (c), surpass the midway location M that batches position K up to bare bobbin Be arrival the revolution of turntable 2 is stopped.And make the silk guide member 7 that constitutes the silk winding mechanism mobile as elastic yarn Y is enclosed the land around one on bare bobbin Be, to after completely package P carries out emergency braking and elastic yarn Y is relaxed, a Ya is stretched on the surface of bare bobbin Be.Be wound on the surface of bare bobbin Be by silk Ya and thread tension that the silk Ya of package P side produces when being involved in, at bare bobbin Be with completely between the package P silk is broken, the silk end was fixed by reeling above the elastica Y of follow-up elastic yarn Y on being stretched in bare bobbin Be.Make after a guide member 7 returns, shown in Fig. 2 (d), 2 (e), bare bobbin Be is got back to batch position K, and thread guide traverse device 4 is moved on on this volume.

Fig. 4 represents as the silk guide member 7 of silk winding mechanism and full package P and be wound onto the position relation of silk between the Y on the bare bobbin Be.Under the state shown in Fig. 2 (c), silk guide member 7 moves, and the silk Y that is traversing is captured 9 li in guiding ditch, and guiding ditch 9 is made of 2 curves 10 on the guide bar 18 that is arranged on a guide member 7.Make a Y guide member 7 be moved around 1 then, make a Y lax, the silk in downstream is contacted with the silk of upstream side fully reliably and be stretched on the surface of bare bobbin Be full package P apply the emergency brake along the periphery of bare bobbin Be.This is because a silk Y when being wound up on the bare bobbin Be, if thread tension is relaxed, makes under the deflated state in advance, makes insufficient contact the between silk and silk, then during batching, extended thread with thread between the amount of contact reduce; The contact amount of silk is few, can separate between the silk in then not at all easy contact and makes a convert failed.

As mentioned above, the spinning take-up machine before this is owing to be after apply the emergency brake relaxes silk in full package, elastic yarn is stretched on the bare bobbin surface, thereby such brake equipment must be arranged, that is, it applies the emergency braking that the auxiliary bare bobbin of a kind of energy is reeled.And the N/R silk that produces when completely the i.e. silk conversion of rod volume appears in the package surface is twisted on the parts.Though under this occasion, above-mentioned N/R silk is a rod volume, because condition such as thread tension is different when batching usually, thereby also difference just of the physical property of silk, must be removed.But because elastic yarn is thinner, gleyness is strong, can not find silk end (the silk end of the last winding part of elastic yarn) when attracting with suction method, that is to say that very difficulty finds the silk end.For this reason, just grabbing above-mentioned with pawl is not the silk of the rod volume part of silk end, and moves package outside face ground to the rod volume is removed.At this moment the accident on gripper damage package surface takes place in regular meeting.

Summary of the invention

The present invention makes for the problem that solves above-mentioned prior art existence.Its objective is provides the simple structure of a kind of usefulness just can carry out an elastic yarn spinning take-up machine of changing, can easily take out from package the silk end of last winding part reliably.

First technical scheme of the present invention of making in order to achieve the above object is that a switching mechanism also is set in the taking-up device for spinning that elastic yarn is used, it is by the silk that is batching in the package being come off from batching the width of cloth, silk is reeled and the thread tension that produces reduces to the bobbin end of the full volume package that has the peripheral speed difference, carries out the silk conversion to bare bobbin.

Second technical scheme of the present invention is silk switching mechanism dual-purpose silk winding mechanism, and elastic yarn is wound up on the bare bobbin.

The 3rd technical scheme of the present invention is in the spinning take-up machine that second described elastic yarn of technical scheme used, the silk that will feed to full volume package side by silk switching mechanism from batch the width of cloth come off after, to the silk winding mechanism that the silk in bare bobbin downstream is during this period of time contacted with the silk of bare bobbin upstream side, be set at and form the time that roll up in packet header in full package end.

Therefore, first technical scheme of the present invention reduces tension force by the silk of supplying with is shed to the slow bobbin end side of rotating speed from the fast package surface of rotating speed, utilize the minimizing of this tension force and make elastic yarn lax, therefore when being wound up into silk on the bare bobbin, can help out.

In second technical scheme of the present invention, can come off the batch width of cloth of silk by silk switching mechanism from package, and again it as the silk winding mechanism, come off the silk intactly be wound up on the bare bobbin.

In the 3rd scheme of the present invention, can be transformed into silk under the occasion of bare bobbin from full package, before the silk of silk that makes the bare bobbin downstream and upstream side contacts, finishes a conversion, guarantee to form the time margin of packet header volume usefulness in the bobbin end of completely package.

Description of drawings

Below, with reference to accompanying drawing embodiments of the present invention are described.

Fig. 1 is the front elevation of main portion of the spinning take-up machine of present embodiment,

Fig. 2 (a)-(e) is the scheme drawing that the spinning take-up machine of expression present embodiment carries out a switching process,

Fig. 3 is the silk guide member of expression present embodiment, completely package and be wound onto the scheme drawing of position relation between the silk on the bare bobbin,

Fig. 4 is silk guide member, the completely package and be wound onto the scheme drawing of position relation between the silk on the bare bobbin before the expression.

The specific embodiment

The basic structure of the spinning take-up machine 5 among Fig. 1 is described earlier.Spinning take-up machine 5 is being provided with crane 1 and turntable 2; Crane 1 can be on support 8 free lifting, turntable 2 is as the position switching mechanism of bobbin line and can turn round.

Supporting contact cylinder 3, thread guide traverse device 4 on above-mentioned crane 1 respectively, above-mentioned contact cylinder 3 is crimped on following being in for a long time and batches on the silk layer of locational bobbin, and bobbin is rotated along anticlockwise direction.Move a hook 6 and be provided with on the thread guide traverse device 4, be incorporated in and move back and forth in the journey scope of traversing and a Y is traversed by moving a hook 6 and silk Y knot.Silk Y is by not having the a/s gait of march of the machine that spins of expression to supply with continuously among the figure.

Above-mentioned turntable 2 is that middle heart is rotated by drive sources such as the induction motor driving that does not have expression among the figure, with axis of revolution 14.And a plurality of bobbins are inserted in respectively on 2 seat of reel 15,16, and the seat of reel 15 of a side is in and batches on the K of position, and the seat of reel 16 of opposite side is on the position of readiness L.For convenience of explanation, the bobbin that the bobbin that forms the silk layer is promptly had package P is labeled as bobbin Bf, and bare bobbin is labeled as bobbin Be.

Silk guide member 7 as the silk winding mechanism is made of swing arm 17 and guide bar 18, and swing arm 17 can be bearing in the following quadrate part of support 8 rotationally by fulcrum, and guide bar 18 is mounted on the front end of swing arm 17.The ratio that swing arm 17 is provided with is at the front end of seat of reel 15,16 position above also, and from this front end to the root of seat of reel 15,16, be provided with cantilevered fashion with extending.The axis of revolution 19 of arm swing arm 17 is being set on such position, and when bare bobbin Be was in the midway location M of the conduct silk dislocation shown in Fig. 2 (c), swing arm 17 rotated the back, guide bar 18 can be wound up into silk Y on the bare bobbin Be.It is in order to make simplifying the structure of spinning take-up machine by following structures that silk dislocation is taken on the midway location M that batches between position K and the position of readiness L, promptly handle silk Y is increased to about more than 1/3 of whole circumference with respect to the winding angle of bare bobbin Be, the revolution amount of a guide member 7 is reduced, only make a guide member 7 make gyroscopic movement on the position of the rotary track that leaves seat of reel 15,16 simultaneously.

Is the center by the driver trains of not representing such as rotary power element to make swing arm 17 among the figure with axis of revolution 19, swing in about 180 degree are interval, and silk guide member 7 moves in the interval of control position shown in the long and two-short dash line from the position of readiness of solid line shown in Figure 1.When silk guide member 7 from the position of readiness to the control position, when anticlockwise direction rotates, on shown in Fig. 2 (c), with the silk Ya in downstream, reeling along the periphery of bare bobbin Be, make a guide member 7 turn on it guiding ditch 9 fully with from the contacted position of upstream side spun silk Yb.Like this, in guiding ditch 9 (member that it also moves as the restriction silk), make from the spun silk of upstream side Yb to contact with a Ya in the guiding ditch 9.Silk Ya, the Yb that is being in contact with one another is owing to be elastic yarn, and viscosity is stronger, and silk Ya is involved in by a quilt silk Yb and is wound up on the bare bobbin Be, and silk Ya is broken.

Guide bar 18 is installed in the front end of swing arm 17, as shown in Figure 3.The guiding ditch 9 that has a Y to enter.Guiding ditch 9 is made of curve 10 and notch 11, and the former is with the part of silk Y along the curve guiding, and the latter is the part that the silk Y by curve 10 guidings is limited.The size of the ditch 9 at the merging position of curve 10 and notch 11 is slightly thicker than silk, and Ya can be contacted really with silk Yb.The position that curve 10 and notch 11 merged is located at from the width of cloth (journey of traversing scope) that batches of package P to be located, silk guide member 7 is with guiding ditch 9 silk Y (beginning winding part) to be wound up into the silk winding mechanism of initial coiling end on the bare bobbin Be end, is again a switching mechanism that silk Y is shed to the end side of bobbin Bf from the full silk laminar surface of package P.Like this, can reduce the number of packages of member, make the simple in structure of spinning take-up machine, and be convenient to control.

At guiding ditch 9, fall the silk Ya of bobbin Bf end side from the silk pull-up of full package P, drop to the slow peripheral speed of bobbin Bf from the full very fast peripheral speed of the silk layer of package P, thread tension moment is reduced significantly.Utilize the instantaneous reduction of above-mentioned line tension can be used for substituting mechanism of the prior art energetically, promptly to package P apply the emergency brake, make a Ya relax, make silk Ya contact fully really, to assist mechanism to the coiling of bare bobbin Be with a silk Yb with retractility.

And the silk Ya that is shed to bobbin Bf end side from full package P not only reduces on tension force moment ground, and till silk end of conversion, silk were cut off, tension force continued reducing.This is because spinning take-up machine is identical with the peripheral speed of bare bobbin Be the peripheral speed that the revolution of seat of reel is controlled to full volume package P, and the peripheral speed of bare bobbin Be is just fast than the peripheral speed of the full bobbin Bf of package P thus.In other words, owing to bare bobbin Be carries out the work identical with feeding roller the tension force of the silk Ya in bare bobbin Be downstream is reduced.

This situation is meant after completely package P is shed to the end side of bobbin Bf, even also can positively carry out the silk conversion a little while.That is to say that the N/R silk that takes place in the time of can changing silk is positioned at ground, a position of bobbin Bf end side really to carry out after the packet header volume 12 of several times curled hair, a Ya contact with Yb and carry out silk conversion.Packet header volume 12 is different with the rod volume that the several times curled hair is carried out at a position on package surface, because the silk end that is wound on the last winding part on the package P is in the end side of bobbin Bf, thereby find this end also to take out easily easily, and, promptly use pawl to grab also and can not damage the package surface, the N/R silk that takes place in the time of also not damaging package P and easily remove the silk conversion.

By the control setup that does not have expression among the figure, to the revolution of the drive source of the driver train of silk guide member 7 and turntable 2 synchronously and speed etc. control.

Below, with reference to Fig. 2 the method that the silk of above-mentioned spinning take-up machine 5 is changed is described.In Fig. 2 (a), turntable 2 is turned round along anticlockwise direction, its silk dislocation that surpasses common spinning take-up machine 5 is turned round (being shown in Fig. 2 (b)), when bare bobbin Be is in the midway location M last (shown in Fig. 2 (c)) that batches between position K and the position of readiness L, make turntable 2 stop revolution.At this moment elastic yarn Y is crimped on the surface of bare bobbin Be, with contacted more than 1/3 (bonding) state of the whole circumference of bare bobbin Be under send to.For ease of explanation, silk Y is designated as Yb in the part of bare bobbin Be upstream side, the part of silk Y in bare bobbin Be downstream is designated as Ya.And, contacted at silk Y and bare bobbin Be simultaneously with the peripheral speed increase 0%-50% of bare bobbin Be, the tension force of Ya side is descended.

In the process of coiling elastic yarn even when carrying out the seat of reel place-exchange, also continue to carry out traversing of a Y.When bare bobbin Be arrived midway location M, silk guide member 7 rotated along anticlockwise direction, and the silk Ya that is traversing is captured 9 li in guiding ditch.A guide member 7 is rotated, make a Ya move to the end side of bobbin Bf from the full surface of package P, simultaneously the silk Yb of upstream side is caught and guided, make a guide member 7 turn to a Ya and contact with a Yb along curve 10.When silk Ya when completely the surface of package P moves to the end side of bobbin Bf, because completely the tension force of the official post silk of the peripheral speed of the peripheral speed of package P and bobbin Bf reduces significantly.And, owing to completely do not add emergency braking on the seat of reel 15 of package P side, thereby reduce and make a Y lax by this thread tension, a Ya and silk Yb are fully contacted in guiding ditch 9 really, a Ya positively is involved in by silk Yb, thus silk Ya is broken.Silk Y (silk of beginning winding part) is wound on the end of bare bobbin Be, forms the packet header volume that begins to reel in the end of bare bobbin Be.

When silk Y is wound up into that bare bobbin Be goes up and during the silk end of conversion, silk guide member 7 is revert to original position of readiness, turntable 2 is deasil turned round, shown in Fig. 2 (e), bare bobbin Be is moved to and batch position K, bare bobbin Be is contacted with contacting cylinder 3, and move on on this volume.At this moment also can make turntable 2 stop revolution in the position shown in Fig. 2 (d), treat that package is moved into state shown in Fig. 2 (e) after forming the diameter of stipulating.

In above-mentioned method for coiling, silk guide member 7 makes tension force in the silk conversion reduce, silk Y is moved on the bobbin Bf from full package P by guiding ditch 9, and silk Ya is hung up, and a guide member 7 is turned to a Ya is contacted with a Yb.That is to say that the minimizing of tension force makes a Ya lax when only utilizing silk Y to be shed to bobbin Bf end side with package P surface, and silk Ya positively is wound on the bare bobbin Be.But in this method, the packet header volume on the end of the bobbin Bf of package P (the packer head volume of coiling latter end) 12 may not necessarily meet the demands quite fully.For this reason below explanation another kind of when carrying also otherwise the energy that the silk end is dismissed forms the method for packet header volume 12 infalliblely.

Because in the method, when bare bobbin Be arrives midway location M, and it is identical with said method to make a guide member 7 rotate this part process along anticlockwise direction, thereby its explanation is omitted.

When bare bobbin Be arrives midway location M, a guide member 7 is rotated along anticlockwise direction.Silk guide member 7 usefulness guiding ditch 9 moves to the end side of bobbin Bf with silk Ya from the full surface of package P, and catches the silk Yb of upstream side and guided, in silk Ya and the rotation that stops a guide member 7 before a Yb contacts soon.When silk guide member 7 stops operating, silk Ya (silk of last winding part) is come off from the scope of batching, continuing to reel in 1 position on bobbin Bf, just forms packet header volume 12.And on bobbin Bf, form after the packet header volume 12 of abundant meet requirements, make a guide member 7 turn to a Ya and contact with silk Yb.Make the gait of march of all speed ratio silks of bobbin Bf of package P slow, the peripheral speed of bare bobbin Be is almost equal with the gait of march of silk, because bobbin Bf is different with the speed of revolutions of bare bobbin Be, thereby silk Ya remains on the state that tension force reduces; Owing to the full seat of reel 15 of package P side is not added urgent braking, thereby silk Ya one-tenth relaxed state, guiding ditch 9 interior common restricted silk Ya are contacted really fully with silk Yb, a Ya is involved in by silk Yb really, and broken, thereby silk Y is wound up on the bare bobbin Be.

Be wound up on the bare bobbin Be and behind the end of conversion of silk, bare bobbin Be be in batch on the K of position at silk Y,, thereby omit explanation them because these processes are identical with said method.As mentioned above, silk guide member 7 also is also used as the winding mechanism that the silk of last winding part is wound up into the last undrawn yarn on the reeled tubing end.

The present invention can also specifically constitute as described below.

(1) method that positively forms packet header volume 12 in the present embodiment is that a guide member 7 is stopped operating halfway, but the speed that a guide member 7 is rotated makes a Ya and silk Yb contact with reducing, thereby a Ya is cut off more lentamente, packet header volume 12 is positively formed.

(2) be that silk guide member 7 is also used as a switching mechanism and silk winding mechanism in the present embodiment, the former is used for silk Y is shed on the bobbin Bf from package P, and the latter is used for silk Ya is wound up on the bare bobbin Be that is in a dislocation.But a switching mechanism also is set discriminably also to be controlled respectively independently with the silk winding mechanism.Also can only use silk switching mechanism in silk winding mechanism ground.That is to say, can form that the thread tension that only utilizes moment reduces and constant thread tension reduces, the silk Ya in downstream is involved in and is wound up on the bare bobbin Be, thereby carry out the structure that silk is changed.

In addition, though in the present embodiment shape of silk guide member 7 has been descended the time, the silk Y of the journey scope of traversing is moved to outside the journey scope of traversing, but also can as before silk guide member 7 be made the shape of energy bridle in the journey scope of traversing, and be free to slide abreast with seat of reel 15,16, after when silk is changed, once constraining in silk Y in the journey scope of traversing, a guide member 7 is slided, make a Y be shed to bobbin Bf, be wound on then on the bare bobbin Be with package P.At this moment a rotation mechanism and silk winding mechanism can be set respectively, also a switching mechanism can only be set.

(3) in the present embodiment, silk conversion is bare bobbin Be to be moved to batch the midway location M between position K and the position of readiness L and carry out, but also can not carry out on midway location M, and carries out bare bobbin Be being moved to batch under the state of position K.

(4) if just in order to form the packet header volume of last coiling, also can be with the spinning take-up machine that does not possess the switching mechanism of seat of reel position.

Spinning take-up machine of the present invention because it has above-mentioned structure, thereby can produce effect as described below:

According to first technical scheme of the present invention, owing to utilize energetically peripheral speed and the full volume of package The bobbin peripheral speed of package poor, thereby just do not need to arrange to the full volume package usefulness that applies the emergency brake Large-scale brake apparatus. Like this, even being set, brake apparatus also is used for stopping at last full volume as long as arrange The rotating midget plant of the inertia of package is just passable, can use simple structure thereby provide a kind of Just can carry out the spinning take-up machine of silk conversion infalliblely.

According to second technical scheme of the present invention, because silk switching mechanism is with silk batching from package The width of cloth comes off, and the silk that intactly this mechanism is used as a silk winding mechanism again, will come off is wound on sky On the bobbin, thereby can reduce the part number of packages, can make the simple in structure of spinning take-up machine, and be convenient to Control.

According to the 3rd technical scheme of the present invention, because not the last winder bundling of elastic yarn On the silk layer of full reeled tubing, but be wound on the end of bobbin, thereby just find the most easily The silk end of rear coiling also takes out the end easily. Again because not needing of taking place can change silk the time Silk positively be wound on the tube, so can not damage package unwanted silk is removed. Therefore, A kind of such elastic yarn spinning take-up machine can be provided, and it can not damage package and when silk changed The unwanted silk that takes place is removed.

Claims

1, the spinning take-up machine used of elastic yarn, it is provided with the bobbin that batches elastic yarn, make the range device that traverses that elastic yarn traverses, adorning 2 seat of reel of bobbin and above-mentioned 2 seat of reel are being batched the place-exchange mechanism that carries out place-exchange between position and position of readiness; Make elastic yarn traverse, this elastic yarn be batched on the bobbin that is installed in the seat of reel that batches the position on one side by the range device that traverses on one side; When becoming full volume, above-mentioned bobbin carries out the place-exchange of 2 seat of reel, the elastic yarn that is wound on the full reeled tubing is changed to bare bobbin, it is characterized in that: also be provided with a switching mechanism, it is by making the elastic yarn that is wound on the full reeled tubing move and come off from batching the width of cloth to the end of full reeled tubing, will be wound on elastic yarn on the full reeled tubing thus to the bare bobbin conversion.

2, the spinning take-up machine used of elastic yarn as claimed in claim 1 is characterized in that: silk switching mechanism is also used as the winding mechanism that begins undrawn yarn, and it is wound on the beginning winding part of elastic yarn on the end of bare bobbin.

3, the spinning take-up machine used of elastic yarn as claimed in claim 1 or 2, it is characterized in that: it is to make that section elastic yarn after move the end of full reeled tubing, up to expiring the elastic yarn rolled up on the reeled tubing to the time of bare bobbin conversion, sets for to be rolled onto time on the full reeled tubing end to the last winding part of elastic yarn.

4, the spinning take-up machine used of elastic yarn, the range device and adorning the seat of reel of bobbin of traversing that it is provided with the bobbin that batches elastic yarn, make that elastic yarn traverses; And make elastic yarn traverse, this elastic yarn be batched on the bobbin that is installed on the seat of reel on one side by the range device that traverses on one side, it is characterized in that: the winding mechanism that also is provided with last undrawn yarn, it is that the elastic yarn that will batch on the bobbin comes off from batching the width of cloth, and its end to bobbin is moved, with the last winding part of the elastic yarn that batching on the bobbin around to the end of above-mentioned bobbin.

5, the silk conversion method of the spinning take-up machine used of elastic yarn, it is to be used in the spinning take-up machine that this elastic yarn uses, and is provided with the bobbin that batches elastic yarn in this spinning take-up machine, makes traverse gear that elastic yarn traverses, is adorning 2 seat of reel of bobbin and above-mentioned 2 seat of reel are being batched the place-exchange mechanism that carries out place-exchange between position and position of readiness; This method makes elastic yarn traverse, this elastic yarn be batched on the bobbin that is installed in the seat of reel that batches the position on one side by the range device that traverses on one side, when becoming full volume, above-mentioned bobbin carries out the place-exchange of 2 seat of reel, and the elastica of rolling up on the full reeled tubing changed to bare bobbin, it is characterized in that; By making the elastic yarn that batching on the full reeled tubing move and come off from batching the width of cloth to the end of full reeled tubing, utilize the minimizing of the thread tension that comes off on the silk course bobbin of elastic yarn with full reeled tubing and produce, the elastic yarn of rolling up on the full reeled tubing is changed to bare bobbin.

6, the silk conversion method of the spinning take-up machine used of elastic yarn as claimed in claim 5 is characterized in that: make elastic yarn after move the end of full reeled tubing, the downstream elastic yarn of empty tube is contacted with the upstream side elastic yarn of bare bobbin.

7, the silk conversion method of the spinning take-up machine of using as claim 5 or 6 described elastic yarns, it is characterized in that: make elastic yarn after move the end of full reeled tubing and will expire the elastic yarn rolled up on the reel before bare bobbin is changed, the last winding part of elastic yarn is wound up on the end of full reeled tubing.

8, the silk conversion method of the spinning take-up machine of using as any described elastic yarn among the claim 5-7, it is characterized in that: the elastic yarn of rolling up on the full reeled tubing after the bare bobbin conversion, is wound up into the beginning winding part of elastic yarn on the end of bare bobbin.