US3097471A

US3097471A - foster

Info

Publication number: US3097471A
Authority: US
Publication date: 1963-07-16
Anticipated expiration: 1980-07-16

Description

July 16, 1963 B. H. FOSTER 3,097,471

METHOD AND APPARATUS FOR COVERING THREAD Filed June 30. 1961 4 Sheets-Sheet 1 FIG. 4.

FIG. I.

INVENTOR BOUTWELL H. FOSTER M BMW ATTORNEY.

July 16, 1963 B. H. FOSTER METHOD AND APPARATUS FOR COVERING THREAD 4 Sheets-Sheet 2 Filed June 50. 1951 FIG. ZAT

INVENTOR BOUTWELL H. FOSTER AT TORNEY.

July 16, 1963 B. H. FOSTER 3,097,471

' METHOD AND APPARATUS FOR COVERING THREAD Filed June 50. 1961 4 SheetsSheet 3 FIG. 8.

CURVES SHOWING EFFECT OF CORE SIZE AND TWIST II PER INCH QN PERcENT QVER-FEED I (SLOT W'DTH V32 I 2 SLOT MOUNTED UNDER AND CLOSE TO PIGTAIL-(APPROX. 3/l6") E I l 30/2 COTTON CORE. 420 DEN. NYLON COVER 30/I COTTON CORE. 420 DEN. NYLON COVER E WITH NO TENSION. I.E. LESS THAN ONE GRAM ON 53/ COVER YARN.

n: LLI 5 H5 TWISTS U 6.4 TWISTS PER INCH PER INCH I/4II I 7 O r S a: LIJ I I/8" E i IO 20 3O 4O 5O 6O 7O 8O 90 I00 IIO I I PERCENT OVER-FEED OF COVER YARN coRE YARN. 30/2 COTTON covER YARN. 42o DEN. NYLON F I G. 9.

TWIST PER INcI-I ||.5

SLOT MOUNTED UNDER PIGTAIL. DIsTANcEs AS SHOWN (SLOT WIDTH V32 I V2" 1 I I NO TENSION ON covER YARN (LESS THAN I GRAMI 'z 9 ll: 8!! I I,,I 5/8 (2 L- I I- O z FEEDING covER ,1 V I YARN INTO SLOTTED FEEDlNG COVER- 3/l6" 3 I TUBE BENEATH YARN BENEATH u PIGTAIL \PIGTAIL WITHOUT E \USE OF SLOTTED I/ TUBE a II II V8 3/!6 O I O 0 IO 20 3o 40 so 7o I00 I0 I20 I30 I40 I50 I60 m NVENTOR BOUTWELL H. FOSTER WWW ATTORNEY.

LENGTH OF SLOT. INCHES y 16, 1963 B. H. FOSTER 3, 9

METHOD AND APPARATUS FOR COVERING THREAD Filed June 30, 1961 4 Shests-Sheet 4 FIG. IO.

30/2 COTTON CORE: 42ODEN. NYLON: II.5 T.P.I.

- VARIABLE DISTANCE BELOW PIGTAIL II FIXED DISTANCE BELOW PIGTAIL (SI-0T WIDTH V32 I v2" I l I I l :2! NO TENSION ON COVER YARN E LE. LESS THAN ONE GRAM m 5 ,1 i U l 9 LL 3 0. 0 v4" A6 3 I\ 9 E I7/I6" SETTING 77 To SETTINGS ,r 1/ 2/ "w I/ V8 g E g I, Q 0 D FIG. II.-

OVER-FEED CHARACTERISTICS COTTON CORE AND SPANTEX CORE (SLOT WIDTH 3/64") 5/12 75 SPANTEX CORE 100 DEN. NYLON CORE I 1/4 5/24 y 7 30/2 COTTO CORE V8 42o DEN. NYLON CORE V12 V24 0 IO 3O 4O 5O 6O 7O 8O 90 I00 IIO I20 I I I I OVER-FEED OF COVER YARN MB-W ATTORNEY.

United States Patent 3,097,471 METHOD AND APPARATUS FOR COVERING THREAD Boutwell Hyde Foster, 3 Sunset Terrace, Maplewood, NJ. Filed June 30, 1961, Ser. No. 121,225 12 Claims. (Cl. 5712) This invention relates to a novel method and apparatus for covering threads. More particularly, this invention relates to a method and apparatus for covering threads, the apparatus comprising feed means for said thread, a spool for storing yarn-covered thread, means for disposing the covered thread on the spool, means for guiding the thread from the feed means to the disposing means, means for delivering the cover yarn to the thread in a lateral zone between the thread guiding means and the disposing means, whereby the yarn balloon is caused to conform to a predetermined pattern so that the length of the cover can be regulated at the point of wrapping.

At the present time there are three well known methods for the covering of threads with a suitable cover yarn. One of these utilizes a hollow spindle for the passage of the core thread and a ring-traveler to wrap the covering yarn about the core. A second method utilizes a cotton spinning frame wherein drafted fibers are wrapped about a rubber thread (during the twisting operation). The rubber thread either by-passes the set of drafting rolls or else is fed through the front delivery rolls along with the drafted fibers. The third method utilizes a twister frame. This twister frame is generally equipped with an extra set of feed rolls in order to feed the cover yarns faster than the core thread.

In all cover yarn constructions the cover yarn is always longer than the core thread for any given length of covered yarn. That is, the cover yarn must be fed faster than the core thread for twisting. This difference in length is frequently referred to as over-feed. The over-feed has an important bearing on such properties as softness, bulk, the degree to which the core thread is covered, balance, hand, appearance of the end product, and the like.

Whenever the over-feed is less than about 12%, the length of the cover yarn is governed primarily by the number of turns of twist and the diameter of the core thread. With over-feeds of greater than about 12%, however, a genuine problem is encountered, for heretofore there has been no reliable or accurate way of controlling the length of the cover yarn.

Accordingly, it is an object of this invent-ion to provide a novel apparatus for controlling the length of cover yarn at ranges beyond the length of that obtained from the usual twisting operation, that is, by the number of twists and the diameter of the core thread.

Another object is to provide an apparatus whereby a greater degree of precision and control of feeding cover yarn to core thread is afforded than was heretofore possible.

Yet another object is to provide an apparatus for covering core threads whereby a greater variety of end characteristics of the covered thread are obtainable.

A funther object is to provide a novel method for covering a core thread with cover yarn, which method affords a greater degree of precision and control and hence a greater variety of end characteristics of covered thread than was heretofore obtainable.

Additional objects and characteristics of the invention will become apparent hereinafter.

My invention will be more fully understood by reference to the accompanying drawings, wherein:

' FIG. 1 is a schematic representation showing one emice bodiment of my apparatus for feeding the thread and cover yarn;

FIG. 2 is an enlarged section of that area of FIG. 1 around the pigtail guide and shows an adjustable slotted tube for the introduction of the cover yarn to the core thread beneath the thread guide means;

FIG. 2A shows an alternative embodiment of my invention and is an enlarged section \of that area around the pigtail guide and shows a member to which is attached a series of guides for the introduction of the cover yarn to the core thread beneath the thread guide means;

FIG. 3 is a side view taken along the line 33 of FIG. 2;

FIG. 4 is a schematic illustration showing the two images that are seen by the naked eye when my apparatus is in operation;

FIG. 5 is a schematic representation showing the apparatus arranged for use in the production of covered thread wherein the core thread is non-stretchable;

FIG. 6 is a schematic representation showing the apparatus arranged for use in the production of a covered thread wherein the core thread is elastic or stretchable;

FIG. 7 schematically illustrates certain desirable operating conditions of my apparatus when used to produce such covered stretchable thread;

FIG. 8 is a graph showing the over-feed obtainable as a function of the length of traverse of the cover yarn and core thread in the slotted tube shown in FIG. 2;

FIG. 9 is a graph showing the degree of control in overfeed obtainable with and without the use of my slotted tube construction;

FIG. 10 is a graph showing the eifect of distance of the slotted tube from the core thread guide means upon the degree of control obtainable and upon end yarn characteristics; and

FIG. 11 is a graph showing the wide range of control in over-feed characteristics [obtainable through the use of my apparatus.

My invention will be better understood by reference to the accompanying drawings, and particularly to FIGS. 1 and 2. Core thread 10 is fed into a pair of rollers 12 and then through a pigtail guide 14. Cover yarn 16 is introduced at a zone generally designated by the reference numeral 18, this zone being beneath the pigtail guide 14, that is, between the pigtail guide 14 and spool 19. Spool 19 serves to store the covered thread 20. The spool is mounted on rotatable twister spindle 22. The rotating twister spindle 22 causes the cover yarn to be twisted around the core thread. The centrifugal force from the rotation causes the covered thread 20 to conform to the shape of a yarn balloon 24. Ring-traveler 26 traverses up and down the length of spool 19 and accordingly distributes the covered thread 20 [evenly over the spool. Referring to FIG. 2, cover yarn 16 passes into a guide device, generally designated by the numeral 27. This guide device comprises a tube 28, one end of which con tains a slot 30. A sleeve 32 has internal threads 33 which match external threads 34 on tube 28. Accordingly, the sleeve can be adjusted by rotating the head 35 thereof to thereby cause the sleeve 32 to either decrease or increase the length of the slot 30. The slot 30 is desirably disposed directly beneath pigtail guide 14. Both the core thread 10 and the cover yarn 16 are caused to traverse through this slot. Since the cover yarn 16 is introduced to the core thread 10 at a point beneath the pigtail 14, the periphery of the yarn balloon 24 is restricted and caused to conform to a desired predetermined pattern. (The periphery of the yarn balloon as it would have appeared without restriction is shown by dotted line 25.) Further, slot 30 provides a zone wherein both cover yarn 16 and core thread 10 traverse laterally back and forth a predetermined distance as they join for twisting. This slot compels the cover yarn to remain in close proximity with the core thread while the twisting occurs so as to promote uniform coverage or" the core thread.

. The over-feed is readily controlled and adjusted by merely controlling the length of the lateral traverse of the core thread and cover yarn in the slot 30', and this control is eflected by simply adjusting the position of the sleeve 32 with respect to the slot 30.

In accordance with another embodiment of my invention shown in FIG. 2A, instead of a guide device comprising a slotted tube and rotatable sleeve (FIG. 2), a solid member 27a, to which a plurality of pigtail guides 28a are attached, can be used to deliver the cover yarn 16 to the core thread 10 at a point below pigtail guide 14. A pigtail guide 39a having a small cross-sectional area is secured at one end of member 27a. As the cover yarn 16 and core thread It} are brought together through pigtail guide 30a, the small cross-sectional area of the guide 30a keeps the cover yarn in close proximity With the core thread while the twisting occurs and this results in uniform coverage of the core thread.

Of course, devices other than slot 30 or pigtail guide 30a can be used to provide the requisite small cross-sectional area zone for the juncture Otf cover yarn and core thread. I have :found that the maximum cross-sectional area at this juncture point should not exceed about 0.20 square inch when making non-stretchable covered threads, and should not exceed about 0.02 square inch when making stretchable covered threads. The minimum cross-sectional area at this juncture point is limited only by the cross sectional areas of the core thread and cover yarn. That is, the cross-sectional area at the juncture point must exceed the cross-sectional area of cover yarn and core thread by a margin sufiicient to permit the covered thread to pass through such cross-sectional area without appreciable frictional drag.

The lateral traverse of the thread and cover yarn in the slot while being twisted together is clearly seen when my machine is in operation. This is schematically shown in FIG. 4. The position of core thread and cover yarn at the end of the slot remote from the sleeve 32 is shown by the solid line whereas when the position of core thread and cover yarn at the opposite end of the slot (wherein the core thread and cover yarn virtually abut the end of sleeve 32) is shown by the dot-dash line 36. Both images are visible to the naked eye when my apparatus is in operation.

A schematic representation of my apparatus arranged for use in the production of covered threads wherein the core thread is of a non-stretchable material is shown in FIG. 5. The non-stretchable core thread 10 is led olf from cone 40, travels across lease rods 42., 44, 46 and 48, through pigtail 50, past a pair of positively driven rfeed rolls 52, and then into pigtail 14 and slot 30 as previously described and shown in FIG. 2. Cover yarn 16 is led off pirn 60 and travels past guide rod 62 and into tube 28 and slot 30 (FIG. 2).

A schematic representation of my apparatus arranged for use in the production of covered threads wherein the core thread is of a stretchable or elastic material is shown in FIG. 6. The core yarn .10 is led off a tensioned flange spool 70. A tensioned weight 72 is attached to the flange spool 70 against a fixed point 74. The cover yarn is thus stretched as it is led off the roll 70, through pigtail guide 72, and through the pair of positively driven feed rollers *12. From feed rollers 12 the thread 10 is led through the pigtail guide 14 and into slot 30 as previously described (FIGS. 1 and 2). The cover yarn 16 is led off .pirn '80 and passes lease rods 82, 84, 86 and 88, then passes guide rod 90, and from there enters into the slotted tube 218 and passes through slot 30.

I have found that the operating conditions for covering a stretchable core thread are rather exacting. FIG. 7 shows three zones, A, B and C, wherein certain specified conditions should prevail in order to obtain optimum results. Specifically, it is advisable that the elastic core thread 10 be stretched from 350 to 450 percent prior to reaching feed rolls 12, that is, in the zone designated A. In the zone between feed rolls 112 and pigtail guide 14, zone B, the core thread should be stretched less than that imparted to it in zone A, say from 200 to 250 percent. The weight of the traveler 26 selected for controlling the size of the yarn balloon 24 and the tension of the core thread as it leaves rolls 12 should be such as to permit an accumulation of twist spirals in the zone between pigtail guide 14 and slot 30 (zone C), and to permit some of the twist spirals formed in zone C to pass through the pigtail guide and into zone B. Desirably the twist spirals in zone B should be approximately half in number of the spirals in zone C and should approximate the number of turns of twist obtained in the relaxed end product. For example, for a covered yarn having 16 t.p.i., the number of twist spirals that are visually observed under operating conditions should be about 16 to the inch in zone B. This is brought about by weight adjustment of the flange spool and by selection of the size or weight of the traveler.

The operating conditions for the obtaining of a covered non-stretchable core thread are not so exacting. However, essentially the same mechanism does occur with the exception that the core thread is not appreciably elongated. With a non-stretchable core thread it is much more diflicult to observe accumulation of twist in zones B and C, however a similar accumulation probably does take place, although in lesser magnitude than that occurring when covering a stretchable core thread.

It is desirable that the tension in the cover yarn at the point of twisting with the core thread be kept to a minimum i.e. the weight on the cover yarn at the point of twisting should not exceed about three grams.

Referring to FIG. 8, there is shown a plot of overfeed as a function of the length of lateral traverse of the cover yarn, that is, the length of the slot 30 through which the cover yarn traverses. Curves are shown for twists per inch of 6.4 and 11.5 respectively. It will be noted that whereas yarn diameter does not appreciably effect the over-feed control, the number of twists per inch is an important factor. Thus, the higher the twists per inch, the greater the range of over feed obtainable.

I have found that the use of my apparatus results in greatly improved uniformity of coverageof the core thread as compared to prior-art methods. I have compared the use of my apparatus for controlling the lateral traverse of core thread and cover yarn with the use of an unmodified twister wherein the cover yarn was fed in to the periphery of the yarn balloon below the pigtail guide, but without the use of such a slotted traverse. Whereas excellent coverage and excellent control of overfeed from 20% to in excess of could be obtained by the use of my apparatus, without such apparatus, when the cover yarn was tied to the core thread at a point beneath the pigtail guide so as to restrict the periphery of the yarn balloon, no genuinely satisfactory covering of the core thread was obtained. Further, overfeed was erratic and not readily controllable. FIG. 9 shows the dilierence in control of overfeed obtainable when (1) using my apparatus including the slotted tube beneath the pigtail 1 4 and introducing the cover yarn therethrough to control the cover thread at the slot for twisting, and 2) introducing the cover yarn beneath the pigtail but not using my slotted tube construction, so that the periphery of the core yarn balloon is not restricted. When the tension in the cover yarn is less than 1 gram the control of over-feed, using my invention, is excellent over a wide range, i.e., for about 2.0 to over-teed. In striking contrast, the degree of control obtainable without the use of the slotted tube 26 is erratic.

FIG. 10 is of interest in showing that the distance of the slot 30 from the pigtail guide 14 has no particular eifect upon the degree of control of over-feed. Thus, even at a distance of 1 inches, uniform and consistent control of over-'feed is obtained.

FIG. 11 shows the very considerable range of control in over-feed available whether the core thread is elastic or non-stretchable. For the elastic core thread it will be noted that the range of over-feed varies from approximately 4 up to in excess of 50%. For a non-stretchable core thread the range varies from about 12 to excess of 120%.

As will be seen from a consideration of FIGS. 8-11, the degree of control of over-feed is largely a function of the length of slot 30 for this controls the extent of lateral traverse of the cover yarn and core thread. I have found that good results are obtained when the length of the slot is from approximately to /8 of an inch. More preferably, I prefer a range from about to of an inch. 1

I have also found that the relative angle between the axis of the slotted tube 26 and the horizontal has an effect upon the overall operation of my apparatus. Thus, the tube may be slightly inclined from the horizontal so that the slotted end 30 is inclined downwardly such that the angle between the axis of the tube and the horizontal is from about zero to 20 degrees. A more preferred range is from about 5 to 15 degrees, with an angle of about degrees conferring optimum results. i

The following two examples, presented in table form, show specific yarns used both for core and cover, show the machine settings utilized (size of slot opening, etc.),

and indicate the type of superior coverage obtainable.

so long as the means for delivering the cover yarn to the core thread are disposed between the last of such guide means and the ring traveler.

Variations can, of course, be made without departing from the spirit of my invention.

Having thus described my invention, what I desire to secure and hereby claim by Letters Patent is:

1. An apparatus for covering a core thread with a cover yarn, said apparatus comprising feed means for core thread, a spool for storing yarn-covered thread, said spool being mounted on a rotatable spindle, said rotatable spindle being adapted to impart twist to core thread and cover yarn, means for disposing covered thread on said spool, means for guiding core thread from said feed means to said means for disposing covered thread on said spool, and means for delivering cover yarn to core thread in a delivery zone between said thread guiding means and said means for disposing covered thread on said spool, said delivering means comprising a slotted tube for cover yarn to pass through, said slot being disposed beneath said thread-guiding means so that core thread will pass therethrough, whereby cover yarn will be delivered to core thread in the zone defined by said slot, said apparatus having space between said. delivering means and said means for disposing covered thread on said spool whereby no restriction is imposed upon core thread and cover yarn.

2. An apparatus for covering a core thread with a cover yarn, said apparatus comprising feed means for core thread, a spool for storing yarn covered thread, said spool being mounted on a rotatable spindle, said rotatable spin- EXAMPLE 1 Stretchable Covered Yarns Latex rubber core Polyurethane core Polyurethane core Yarns:

Cor s Lactron 135's Spandex 110s Spandex. Cover 24s cotton". 70 den. nylon 70 den. nylon. Machine settings:

Twist per inr'h 5. 7 2. 5. 7. Tension weight ms 2. 6 0. Q 1. 2. Traveler sire #17 #6. #11. Dimensions of slot opening (length 2: width) /32 x %4, lz X %4 152 x $62. Tests on covered yarn (reloped):

Twist per inch 13. 3- 16. 8 16.0. Length of core in 36 of y 7.7 6.3 8.1. Length of cover in 36 of yarn 9"--. 6. 5". Description of cover on core Loosely wrapped Loosely wrapped Loosely wrapped.

EXAMPLE 2 Non-Stretchable Covered Yarns Yarns:

Cor 30/2 cotton 185 den. polypropylene. Covet 420 den. nylon 420 den. nylon 2-ends of 40 den. nylon. Machine settings:

Twist per inch 11. 5 11. i 24. 0. Tension on core Lease rods Lease rods Lease rods. Traveler size 6. Dimension of slot opening (length x width). $62 x %4 x %a" H2" x A32. Tests on covered yarn:

Twist per inch 11. 8. 12. 0 26.0. Length of core in 36 of yarn 36 36 36. 4". Length of cover in 36 of yar 40 79 52. Description of cover on core Tightly wrapped Loop yarn formations.-- Tightly wrapped.

Throughout this application I have used the word thread with the intention that it cover a single monofilament as well as a plurality of filaments or staple fibers twisted together to form a yarn.

It will be noted that my invention comprehends an apparatus with means for delivering a cover yarn to a core thread in a lateral zone, i.e. the slot 30 (FIG. 2) or the opening defined by the pigtail guide 30a (FIG. 2A), between the ring traveler 26 and the guide means, e.g. pigtail guide 14. Of course, additional guide means can be employed in the apparatus besides pigtail guide 14,

dle being adapted to impart twist to core thread and cover yarn, means for disposing covered thread on said spool, core thread guide means between said feed means and said means for disposing covered thread on said spool, means for delivering cover yarn to core thread at a delivery zone between said core thread guiding means and said means for disposing covered thread on said spool, means for limiting the movement at said delivery Zone of cover yarn and core thread in a direction substantially perpendicular to the longitudinal axis of the core thread to maintain cover yarn in close proximity with core thread at said delivery zone and to permit core thread to generate a balloon between said guide means and said delivery zone and covered thread to generate a balloon be? tween said delivery zone and said means for disposing covered thread on said spool, said apparatus having space between said delivering means and said means for disposing covered thread on said spool whereby no restriction is imposed upon core thread and cover yarn.

3. A method for covering a core thread with a cover yarn in apparatus having means for guiding the core thread from a core thread supply to means for disposing covered thread on a rotatable spool adapted to impart twist to core thread and cover yarn, this method comprising passing core thread from said supply means to said disposing means, delivering cover yarn to said core thread in a delivery zone between said core thread guiding means and said means for disposing covered thread on said spool, limiting the movement at said delivery zone of said cover yarn and said :core thread in a direction perpendicular to the longitudinal axis of said core thread to maintain said cover yarn in close proximity with said core thread at said delivery zone and to permit said core thread to generate a balloon between said guide means and said delivery zone and said covered thread to generate a balloon between said delivery zone and said means for disposing covered thread on said spool.

4. The apparatus of claim 2 wherein said means for delivering said cover yarn to said thread are disposed beneath said thread-guiding means.

5. The apparatus of claim 1 wherein said slotted tube is axially disposed substantially perpendicular to the longitudinal axis of said thread.

6. The apparatus of claim 1 wherein the slotted tube 8 is providedwith means for adjusting the length thereof.

7. The apparatus of claim 6 wherein said adjusting means comprises a sleeve disposed around said tube. 8. The apparatus of claim 1 wherein said slotted tube is disposed so that the slotted end thereof is tilted downwardly with respect to the opposite end thereof, the angle of said tilt being from about 5 to 15 degrees.

9. The apparatus of claim 2 wherein said delivery means for said covering yarn comprises a plurality of pigtail guides, the last of said pigtail guides disposed beneath said thread-guiding means so that said thread will pass therethrough, whereby said covering yarn will be delivered to said thread in the zone defined by said last pigtail guide.

10. The apparatus of claim 2 wherein the cross-sectional area of said lateral zone does not exceed about 0.2 square inch.

11. The method of claim 3 wherein said cover yarn is delivered to said core thread in a delivery zone beneath said thread-guiding means, the cross-sectional area of said zone not exceeding about 0.2 square inch.

12. The method of claim 3 wherein the traverse of said cover yarn just prior to delivery thereof to said core thread is substantially perpendicular to the traverse of said core thread.

References Cited in the file of this patent UNITED STATES PATENTS 1,433,242 Shardlow Oct. 24, 1922 2,263,614 Cote Nov. 25, 1941 2,338,656 McNalley et a1 Jan. 4, 1944 2,854,812 Harris et a1. Oct. 7, 1958

Claims

3. A METHOD FOR COVERING A CORE THREAD WITH A COVER YARN IN APPARATUS HAVING MEANS FOR GUIDING THE CORE THREAD FROM A CORE SUPPLY TO MEANS FOR DISPOSING COVERED THREAD ON A ROTATABLE SPOOL ADAPTED TO IMPART TWIST TO CORE THREAD AND COVER YARN, THIS METHOD COMPRISING PASSING CORE THREAD FROM SAID SUPPLY MEANS TO SAID DISPOSING MEANS, DELIVERING COVER YARN TO SAID CORE THREAD IN A DELIVERY ZONE BETWEEN SAID CORE THREAD GUIDING MEANS AND SAID MEANS FOR DISPOSING COVERED THREAD ON SAID SPOOL, LIMITING THE MOVEMENT AT SAID DELIVERY ZONE OF SAID COVER YARN AND SAID CORE THREAD IN A DIRECTION PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID CORE THREAD TO MAINTAIN SAID COVER YARN IN CLOSE PROXIMITY WITH SAID CORE THREAD AT SAID DELIVERY ZONE AND TO PERMIT SAID CORE THREAD TO GENERATE A BOLLOON BETWEEN SAID GUIDE MEANS AND SAID DELVIERY ZONE AND SAID COVERED THREAD TO GENERATE A BOLLOON BETWEEN SAID DELIVERY ZONE AND SAID MEANS FOR DISPOSING COVERED THREAD ON SAID SPOOL.