US2338723A - Manufacture of bobbin spun rayon - Google Patents

Description

Jan. 11, 1944. A. JACKSON 2,338,723

MANUFACTURE OF BOBBIN SPUN RAYON I Filed June 12, 1941 3 Sheets-Sheet l Jan. 11, 1944. A. L. JACKSON MANUFACTURE OF BOBBIN SPl IN RAYON Filed Jui'le 12, 1941 3 Sheets-Sheet 2 W 3 s WWW m i! m m m o mm W o [IF 9 km fi/M .ulm Q n\ \w w w a r4 x \PnN NR m a; Y m I56 I Fl. um

112%11. Jackson 3 Sheets-s 3 V A. L. JACKSON MANUFACTURE OF BOBBIN SPUN RAYON Filed June 12, 1941 1 6 3 fil I t a lll-l Ill- II II III "II Patented Jan. 11, 1944 OFFICE MANUFACTURE OF BOBBIN SPUN RAYON Arthur L. Jackson, West Ashevllle, N. 0., assignor to American Enka Corporation, Enka, N. 6., a corporation of Delaware Application J ne 12,1941, Serial No. 397,193

15 Claims. (01. 242-43) This invention relates to the manufacture of 7 threads of synthetic origin, and is more particularly directed to an improved method and apparatus for the bobbin spinning of rayon.

Although bobbin spinning is one of the oldersystems for the manufacture of rayon, it persists as the leading commercial method. This is unquestionably due to the basic simplicity and versatility of the process, as well as to the superior q lity of yarn produced thereby. I

Essentially, bobbin spinning consists in the collection of freshly spun thread upon a foraminated bobbin and the after-treatment of the bobbinsupported wound body. Necessarily, bobbin spinning is intermittent. for a spinning machine must be dolled upon the completion of the simultaneous preparation of a large number. of thread packages; and. since each doiling requires concomitantly the replacement of the filled bobbins b empty ones and the threading up of each unit of the machine, it is inherently advantageousto wind packages of as great weight as possible consistent with satisfactory after-treatment. Furthermore, since each bobbin undergoes the same amount of manipulation during after-treatment, it is in the interest of operating economy to treat as much thread as possible on 9. single bobbin during each such operation.

Previous efforts to attain the foregoing advantages have, in general, followed two lines. One of these involves the use of larger spools and the other is concerned with the winding pattern of the thread.

The employment of large spools has not resulted in a solution of the basic problem of bobbin spinning for. although it is obvious that a bobbin of large size will hold more thread than a small one. there are limits beyond which in creases in bobbin size are no longer feasible. These limits are imposed by the structure of varionsimitsonwhichthethreadistreatedasweli cormteredifthelengthorthebobbin the bobbins being customarily supported from one endonlyandthethreadbeingiaidupthereon vgenerallyaccordingtoapatterncontrolledIna reciprocating traverse bar. Thus, 'the optimum bobbinsiseisnowfairlywellstabilisedinthe rayonindustryandrecenteiiortsdirectedtothe productionofwashabiethrccdpacksgesorincreased weight have been directed to control of the winding operations.

- The winding pattern schemes heretofore proposed in the interest of producing heavier packages "of rayon thread susceptible to'satisfactory after-treatment have not met'with commercial success, although some improvement in the washing qualities of smaller packages has resulted. Usually, pattern control systems involve a cam directed traverse bar, the purpose of which is to control the manner in which successive layers of thread are laid up on the spinning bobbin. In theory, there have been several patterns suggested which should result in the production of large packages of satisfactory size. In practice, however, this has not been the case, the packages produced being characterized by non-uniform permeability. This non-uniformity may take a number of forms. Thus, thread packages are frequently characterized by areas too dense to be washed at all, while others may be washed.

. but, because of differences in thickness along varions radii of the packages, each after-treatment must be continued for a period of time sufllcient to properly wash the portions of greatest radial thickness, with resultant ineiiicient waste of that the industry has been heretofore forced to forego the economy inherent in the preparation of thread packages of substantial weight.

It is, therefore, an object of this invention to overcome all of. the foregoing di'iiiculties and to provide a process and apparatus for the preparation of wound packages of freshly spun thread of synthetic origin characterized by imiform permeability and density and a weight greatly cess "of that heretofore attainable.

According to this invention, it is contemplated that thread be laid up inrpackage form by apparatus so controlled as to accurately reproduce a theoretically desirable pattern.

It is within the purview of this invention to greatly increase the winding periods in the manufacture of bobbin spun men while, at-thesame gingimproving the quality of the thread pro- Other. objects and advantages of this invention will be apparent upon'consideration of the following detailed description of s cminexbodiment thereof in conjunction with the an- Figure 6 illustrates a .completed thread pack-l age according to the present invention, broken away at one end to show the first several layers of thread on the package. I

The illustrated apparatus consists of a plurality of driven foraminated collecting bobbins l onto each of which a thread issuing from a spinning bath, not shown, is wound. The thread is laid up on each package by a thread guide these guides being attached to andcarried by a traverse bar l2. Traversebar l2 underlies and reciprocates axially of bobbins ID, the movement thereof being initiated bya cam l3 and controlled as to length of stroke by a stroke shortening mechanism designated generally by the numeral I4.

It will be seen that each of the bobbins I0 is mounted on a bobbin holder l5 which is provided with a drive shaft l6 mounted in bearings I1 and 8 suitably attached to portions of the frame IQ of the machine. Each drive shaft I8 is provided with a drive gear 20 meshing with and driven by a gear 2|. The gears 2|," corresponding in number to the number of bobbins with which the machine is provided, are keyed at spaced points along a shaft mounted for rotation in bearings '23 and 24 supported by portions of frame |9.

Shaft 22 constitutes the main drive shaft of the spinning machine, rotation being imparted thereto through gear 25 driven from any suitable source, not shown. It is, of course, contemplated that said suitable power source may operate through a variable speed transmission so that the rotational speed of bobbins III will be progressively decreased during the winding period to an extent sumcient to compensate for a tendency toward increased take-up speed brought about by increase in the eflective diameter of the bobbin because of the body of thread built thereon. Such variable speed transmissions for maintaining a constant bobbin take-up speed are per se known and form no part of this invention. An example of such an arrangement is shown and described in Patent 2,159,032 to W. G. Lea. It is apparent, therefore, that when shaft 22 is driven each of the bobbins II is caused to rotate and,

since all gears 2| and 20 arethe same size, the speed of rotation of each bobbin ill will be equal to that of all other bobbins with which the machine is provided.

a Upon reference to Figures 1 and 2, it will be noted that, in addition to gears 2| and gear-2|,

' shaft 22 is likewiseprovided with a gear 2! the purpose of which is to drive cam IS. The movement of cam," is eflected through a speedreduction gear train consisting of gears 21, 28, 20, 30, II and 3m. Gears 21. and. are keyed adiacent opposite ends of a shaft 32 mounted in bearings 33 and 34. Gear. 21 meshes with gear 28 and through shaft 32 drives gear 2|. Gears 2! and so are mounted on stub shaft II, gear 29 meshing with gear 28 and gear 30 serving to drive gear 3| of larger diameter. Gear 3| is mounted on a shaft 36. and meshes with gear lia mounted on shaft 31.

The shaft-31, in addition to supporting gear em, likewise supports cam, l3, the hub 38 of which is keyed thereto for rotation therewith.

Inasmuch as shaft 31 must support cam |I as well as gearllla, bearings 39, 40, 4| and 42 are provided, their. design being such as to insure proper absorption of axial as well as -radial thrust.

It is now apparent that cam l3, although driven from shaft 22 which drives the bobbins III, will rotate at a far slower speed than said bobbins. Thus, since the speed of rotation of cam l3 controls the speed of reciprocation of traverse bar i2, while the speed'of the bobbins l0 controls the linear speed of take-up, the thread will be wound on said bobbins in the form of a helix, the angle'of which at the beginning of thespinning period, primarily depends upon the ratio of cam speed to bobbin speed. It is equally evident, how ever, that to insure the production of a truly helical wind by the synchron zation of the rotation of cam l3 and bobbins the former must develop along a straight line, i. e.,-'the linear movement of its follower must always be directly proportionalto the angular displacement of the cam throughout its rotation." In this way, the cam imparts to its follower a reciprocating motion of substantially unvarying characteristics or, in other words, between reversals of direction at any given timeythe follower will move at a constant speed; To this end, cam I3 is provided with a groove, so cut as to insure movement of its follower 43 in a linear sense in direct proportion to the angular displacement of cam I! in its rotation with shaft 31. The movement of the follower is transmitted unimpaired to the traverse bar by apparatus to be hereinafter described,

Cam follower 43 is supported in a cross head 44 provided with apertures for the reception-of rods 45 and 48 on which thecross head may freely reciprocate while at all times being confined to movement in a single plane. Rods 45 and 46 are rigidly held in spaced sleeves of a pair of brackets 41 and 48 which are attached to vertical portions of frame is.

An arm 48 is pivotally attached to cam follower 43 at one of itsaends while, at its other.

end, it is pivotally attached to a nut 50. In this regard, note Figures 1, Sand 5 in which it can be seen that arm 49 is a double one and that pins 50a and 50b connect the free ends thereof to nut 50.

Nut 50 is arranged to slide vertically in a curved double trackway ii which constitutes an integral portion of stroke shortening device l4. Device I4 is attached, at its end remote from the location of nut 5|, to a rock shaft 52 mounted in bearings 53 and 54 atop frame l9. Depending from rock shaft 52 'are arms I! and 58 which support traverse bar 2. The support of traverse bar I! economy the left side of the spinning machine as viewed in Figure 2 may also. be'provided with a series of bobbins and the laying up of thread thereon can be controlled by cam I8. Because the links 51 and 58 are pivoted to the depending arms 55, 58 and 58, the reciprocating motion ultimately transmitted to thread guide II will be in a single moving horizontal plane thus preventing the guides from tilting in passing from one end to the other on the spools. Y

Depending from links 51 and 58 are traverse bar supporting members Bi and 82. Thus, when cam I8 is rotated, follower l3 reciprocates causing oscillation of shaft 52 through rocking stroke I shortening device I. Oscillation of shaft 52, of course, causes reciprocation of traverse bar i2. Itshould be noted that, although stroke shortening device I4 is susceptible to simple harmonic motion, the nut 50 is so remote from shaft 52- as to maintain and transmit substantially unimpaired the movement of the cam follower. Since it is desirable that the ends of wound packages of sitely directed true helices upon the bobbin cannot occur.

' To insure stroke shortening, without interference with the transmission of 0am development to traverse bar I2, is the purpose of stroke shortening device l4. Device It consists of two parallel frame members 63 and 84 attached to and depending from a sleeve 65 which rotates with a ratchet wheel 55 is mounted for rotation on a shaft 51, this shaft also having pivoted thereto desired size on bobbins i0.

- shaft 52. Betweemthe two members 63 and 64 the bifurcated end of an arm 88 which is normally maintained in afixed position by a spring 69, Spring 89 serves to bias arm 88 against a stop member 68a of any conventional type. Pivoted between the shanks oftlfe bifurcated portion of arm 68 is a. pawl 10 maintained in en'- gagement with the teeth of ratchet wheel 66 by a spring 'II.' The end of arm 68 remote from the point of attachment to shaft'fl is arranged to contact a roller 12 depending. from the top of frame is. Thus. as the entire stroke shortening assembly ll is rocked by arm 49 each; cycle of movement will be accompanied by. thestriking of arm 88 against .roller 12 to ca'use'said arm'to move in'a clockwise direction as viewed in Figure 3 thereby driving ratchet wheel 66 in the direction of the arrow through the medium of pawl 10. As spring returns arm 68 to normal positionwhen said arm and roller 12 are'out of contact, a pawl 13 maintains ratchet wheel '86 in position. Another ratchet-wheel I8 is mounted on a shaft ll parallel but below shaft 81. Also mounted on shaft I4 is a driving pawl 15 in eluding a pivoted tooth normally maintained in engagement with ratchet wheel 18 by. aspring f 11. Pawl I5 is adapted to be successively engaged by each of the four pins 18 with which ratchet wheel 88 is provided. These pins causemovement of pawl "I5 in'a counterclockwise direction as viewed in Figure 3, and such movement is as also attached thereto. Gear at meshes with a gear 8| mounted on a shaft 82 parallel but below shaft II. On this shaft a bevel gear 88 is also mounted. Bevel gear 88 meshes with bevel gear 88 which is amxed to one end of a threaded shaft 85 upon which nut 58 is threaded.v Intermediate shafts 14 and 82 a rod is provided ex-.

tending from frame member 68 to frame member 84. This rod serves to anchor spring 19 acting on pawl 15 as well as a spring 88 acting on the shank of pawl 13 and spring 81 acting on a pawl 88 which serves to hold ratchet wheel 18 against. undesired rotationduring the return of pawl I5. Pawl 88 is mounted for free rotation in turn will depend upon th'iiurnber of revolutions of cam I3. It can be further seen that rotation of screw 85 will vary the distance of nut .58 from shaft 52 and thus vary the amplitude of the rocking movement of the latter to an extent varying with the distance of the nut therefrom. For this reason screw 85 is arranged to be driven in such a way as -to cause nut to gradually move away from the rock shaft 52 during the spinning period, the movement, by virtue of the speed reduction pawl drive, being so gradual that its completion will coincide with the completion of the winding of packages of the The effect of the shortening of the amplitude of rocking movement of shaft 52 is to reduce the length of the path of travel of traverse bar. I: thereby producing packages having conical ends. 5 Despite the shortening of the stroke of the tarverse bar, it will be seen that its movement will remain directlyproportional to the linear displacement of the cam. Thus, the packages between the'conical ends will be of uniform cross-section. Necessarily, of course, stroke shortening will reduce the speed of'travel' of the traverse bar between reversals of direction for any given frequency, but the actual speed of travel of the traverse bar between reversals of direction, at any one time, will be directly controlled by the speed of rotation of the cam. The phenomenon just mentioned is evidenced in the package by a progressively closer spacing'of truly helical coils of thread 'during the winding period. The result of this is a controlled pattern wind of maximum uniform density consistent with good washing character- I isti'cs;

At the close of the spinning period, it .will be recognized that nut 58 will be located a maximum distance away from rock shaft 52. As a consequence, the motion of screw 85 must be reversed and nut 58 returned to starting position before the beginning of the next spinning period.

posite to that in which it is driven through gear J 8i. Pawls 88 and 15 are provided with pins 88a transmitted to ratchet wheel 15. The return,

' of pawl 15 is effected by spring "attached to a portion of its shank which extends below the pivot point about shatt l4. Ratchet wheel 18,

being-keyed to shaft H, serves to drive agear and 15a, respectively, which are held down by hand to allow ratchet wheel 16 to turn freely during this operation. Note that pawl 88, being freely rotatable about shaft 82, is not driven duringreversal of screw to m s I It has now been shown that the production of a satifactory winding control movement of return nut 50 to startmovement of the traverse bar. To this end, a novel type of thread guide has been devised.

Referring again to traverse bar l2, it will be.

seen that said bar is provided with a plurality of winding with uniform interstices throughout the raised portions 90 underlying and in the same vertical plane as the various bobbins ID. A rod 95 is passed through each of the raised portions 9d and a hub 92 is pivoted thereto. Extending upwardly from each hub 92 is a fork 93 the tines of which are adapted to contact tangentially the respective bobbin. In order to insure firm con tact and at the same time to allow for increases in package diameter during winding, a counterweight extends from each hub 92 at a point diametrically opposite fork 93. The distance of the weight from the axis may be made adjustable to insure proper contact consistent with avoidance of injury to threads having different, characteristics as regards resistance to abrasion.

Because of the fact that the tines of each forked guide 93 actually contact the bobbin and the coils of thread wound thereon,'there can be no lag between the movement of the traverse barand the thread directed thereby. will follow accurately the pattern of movement of traverse bar l2 even during changes of direction, the break being sharp to insure avoidance of humps at the end of the package.

A plurality of self-threading guides 95, see Fig -ure 4, are attached to traverse bar l2, at spaced points along its length coinciding with the points of location of packages contacting thread guides I l. The self -threading guides 85 are provided with a slot at 96 arranged below and in registry with the slot defined by the tines 93 of thread guides H. Thus, in threading up, the pull between the thread source and the collecting bobbin will cause the thread to slide along the right-hand surface of guide 95, as viewed in Figure 4, thus pulling the thread into the slot at 96. Guide 95 is provided with an extension 9] received .in a socket in traverse bar l2, the extension serving to lock the guide in position. A pin 98 constitutes the primary support for guide 95, said pin passing through the traverse bar as can be seen in Figwound packages of thread may be produced, the.

packages being characterized by uniform permeability and uniform radial thickness, except at the conical ends. It is evident that because cam Thus, the thread package which permit the passage of washing liquid therethrough. The interstices'are not con tinuous, however, in a radial sense, so that all portions of the thread are properly treated during the washing operation.

It is an important phase of this invention that the stroke shortening device H does not interfere with the transmittal of the cam development to the traverse bar. The importance of-this is emphasized when it is borne in mind that the prior art constructions are characterized by a stroke shortening effected by alteration of the axis of the cam with incident interference with the development thereof or by divorced stroke shortening means having a movement such as to interfere with the cam development.

Having now described the invention in its preferred form, it is understood that variations and modifications may be made therein without departing from the spirit of the invention, and it is desired that the scope thereof be limited only by the spirit of the appended claims.

What is clhimed is: 1. A method for the preparation of heavy packages of freshly spun thread of synthetic origin which comprises, supplying forcollection thread moving at a substantially uniform linear speed, forming such thread as supplied into "a plurality of superimposed oppositely directed substantially true helices, traversing the thread across the face of the said package at a constant speed between reversals of direction at any given time and from a point in contact with the surface of the package, and regularly progressively decreasing throughout the collecting period the axial length of successively formed helices.

2. A method for the preparationof heavy packages of freshly spun rayon thread which comprises, supplying for collection thread moving at a substantially uniform linear speed, forming such thread as supplied into a'plurality of superp a point in contact with the surface of the pack- I3 and bobbins ID are each driven from shaft 22 they are driven in synchronism. The linear movement of the follower associated with cam I3 is directly proportional to the angular displacement of said cam. The consequence of this is the production of truly helical coils throughout the entire winding period. As the coilsare superimposed, the angles of succeeding helices will be reduced due to the shortened travel ofthe traverse bar; but, at all in its path 'of travel between reversals of movement, traverse bar I: will move, at a constant speed: There is no acceleration'or deceleration thereof between reversals of movement which will cause localized close coil spacing evidenced in the final package by humps and valleys, the former requiring a longer washing. period. The winding pathbeing so accurately controlled allows for very close of the traverse member and thespeed of travel Q age; and continuously decreasing throughout the collecting period the axial length of successively formed helices at a rate in direct proportion to.

means for continuously producing reciprocating motion of unvarying characteristics, a'connecting means for imparting unimpaired the motion produced by said first means to the traverse member, means for continuously reducing at it directly proportional ratio the stroke amplitude thereof between changes in direction, and a package contacting thread guide carried by said traverse member and movable axially of the bobb to direct laying up of thread thereon.

4. In apparatus for the bobbin spinning of rayon including, a thread source, a driven thread package collecting. bobbin and atraverse member, means for continuously producing reciprocating motion of unvarying characteristics, a connecting means for imparting unimpaired the motion produced by said first means to the traverse member, means constituting a part of said connecting means for continuously reducing at a package collecting bobbin and a traverse mem-' bet, a cam for continuously producing recipro-- eating motion of unvarying characteristics, connecting means for imparting unimpaired the motion or said cam to the traverse member, means constituting a part of saidconnecting means for continuously reducing at'a directly proportional ratio the stroke amplitude of the traverse member and the speed of travel 'thereof between changes in direction, and a package contacting thread guide carried by said traverse member and movable axially of the bobbin to direct the laying up of thread thereon. 1

6. In apparatus for the bobbin spinning of rayon including, a thread source, a driven thread package collecting bobbin and a traverse member, a cam for continuously producing reciprocating motion of a linear speed directly proportional to the angular velocity of the cam, connecting means for imparting unimpaired the motion of said cam to the traverse member, means constituting a part of said connecting means for continuously reducing at a directly proportional ratio the stroke amplitude of'the traverse member and the speed of travel thereof between changes in direction, and a package contacting thread guide 'carried by said traverse member and movable tothe angular velocity of the cam, connecting means for imparting unimpaired the motion of said cam to the traverse member, means constituting a part of said connecting means for continuously reducing at a directly proportional ratio the stroke amplitude of the traverse memcam for continuously producing reciprocating motion of a linear speed directly proportional to the angular velocity of the cam, connecting means for imparting unimpaired the motion of said cam to the traverse member, means constituting a part of said connecting means for reducing at a directly proportional ratio of the stroke amplitude of the traverse member and the speed of travel thereof between changes in direction, means for actuating said reducing means proportionally to the number of changes of direction of said connecting means, a package contacting thread guide carried by said traverse member and movable axially of the bobbin to direct the laying up of thread thereon, and means for driving said cam and bobbin in synchronism.

10. In apparatus for the bobbin spinning of i'reshly spun rayon thread including, a thread source, a foraminated thread package collecting bobbin and a traverse bar, a cam for continuously producing reciprocating motion of a linear speed directly proportional to the angular velocity of the cam, said cam having a peripheral groove therein, a follower in said groove, means for conlining the movement of said follower to a single plane, a rod pivotally connected to said follower,

ber and the speed of travel thereof between changes in direction, a package contacting thread guide carried by said traverse member and movable axially of the bobbin to direct the laying up of thread thereon, and means for driving said cam and bobbin in synchronism.

8. In apparatus for the bobbin spinning of rayon including, a thread source, a threadpackage collecting bobbin and a traverse member, a cam for continuously producing reciprocating motion of a linear speed directly proportional to the angular velocity of the cam, connecting ing at a directly proportional ratio the stroke amplitude of the traverse member and the speed of travel thereof between'changes in direction,

means for actuating said reducing means proportionally to the number m! changes oi direction of said connecting means, and a package contacting thread guide carried by said traverse member and movable axially of the bobbin to direct the laying up'of thread thereon.

a In apparatus for the bobbin spinning 01' a rayon including, a thread source, a thread packle c i g bobbin and a traverse member-,1 15 motion'otunnrving characteristics, a, connecting the free end of said rod being pivotally attached to a nut, an arm including a screw receiving said nut, a rock shaft, said arm being attached to said rock shaft at a point substantially remote from the location of said screw, said rockshaft being driven through said arm by the rod connected to the. cam follower, means carried by said arm for turning said screw to vary the distance of said nut from the rock shaft proportional to the number of reciprocating. strokes thereof, a traverse bar driven from the rock shaft to which said am is attached, a package contacting thread guide carried by said traverse bar, and means for driving said cam and bobbin in synchronism;

1. In apparatus for the bobbin spinning of freshly spun rayon including, a source of thread, a driven collecting bobbin and a reciprocating traverse bar operatively associated therewith, a package contacting thread guide comprising, a

hub portion pivotally attached to. the traverse bar at a point below but in the same vertical plane as the axis of the bobbin, a thread receiving portion extending upwardly from said hub to contact tangentially the cylindrical wall of said bobbin, and a counterweight depending downwardly from said hub in alignment with said thread receiving portion.

12. In apparatus for the bobbin spinning of freshly spun rayon including, a source of thread,

a driven collecting bobbin and a reciprocating hub in alignment with Sam bifurcated-portion,

whereby the bifurcated portion will always con-' tact the bobbin or the package wound thereon to insure the laying up of thread exactly in accordance with the pattern of movement or the" traverse bar.

13. In apparatus for the bobbin spinning of rayon including a thread source, a driven thread package collecting bobbin and a traverse member. means for conflnuously producing reciprocating s sesame means for transmitting to the traverse member substantially unimpaired the motion produced by said first means and a package contacting thread guide carried by said traverse member and movable axially of the bobbin'to direct laying up oi thread thereon.

14. In apparatus for the bobbin spinning of rayon including, a thread source, a driven thread package collecting bobbin and a traverse member, means for continuously producing reciprocating motion of unvarying characteristics, a, connecting means for transmitting to the traverse member substantially unimpaired the motion produced toy said first means, means acting on said connecting means for reducing'the stroke amplitude of the traverse member without altering the reoiprocatin motion of unvarylng characteristics, and e package eontoctlng thread guide carried by said traverse member and movable cruelly oi the lacin bin-to direct loving up or thread 15. In apparatus for the bobbin spinning of rayon including a thread source, a driven thread package collecting bobbin and a traverse member, means for continuously producing reciprocating motion of unvarying characteristics, a connectin means for transmitting to the traverse member substantially unimpaired the motion produced by said first means, means for progressively reducing the stroke amplitude of the traverse member during the collection period, the speed of travel of the -traverse member between changes in 61:- rection varying directly with the speed of the means for continuously producing reciprocating motion and as a function oi the stroke amplitude, and c paclmce contacting thread guide can rierl by sold traverse member and movable arise-lit of the bobbin to direct laying; up of the thread thereon.

ARTHUfi JACKEiUE

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