US2603939A

US2603939A - Guide for centrifugal spinning

Info

Publication number: US2603939A
Application number: US118957A
Authority: US
Inventors: John A Miles
Original assignee: American Viscose Corp
Current assignee: Akzo Nobel UK PLC
Priority date: 1949-09-30
Filing date: 1949-09-30
Publication date: 1952-07-22
Anticipated expiration: 1969-07-22

Description

July 22, 1952 J. A. MILES GUIDE FOR CENTRIFUGAL SPINNING Filed Sept. 30, 1949 t v INVENTOR. JOHN A. M/LE ATTORNE Y.

Patented July 22, T952 1 f UNITED STATES PAT EN T OFFICE f ifi GUIDE Fon 'CEN"rRIFUGa/'ALv vsPnaNINGf John A. Miles, Chester, Pa., assignor to Americanv l' f Viscose Corporation, Wilmington, Del., a cor' porationofDelaWare 'f- Ap'plieation september 3o, 1949,'seria1'N'o. 118,957V

Claims.

` This invention relates to yarn guides adapted to 'control the centrifugal delivery of a strand into: a rotary bucket 'such as is used to collect artificial'iilamentary-material from a spinning machine therefor.

` In spinning viscose rayon, for example, minute streams of viscose solutions are continuously extruded into an acid ybath and coagulated into lam'ents which are withdrawn therefrom and passed over a series of guides and godets and through a reciprocating'v guide which vextends centrally into a'rotating Vbucket whichv collects the strand. The strand is discharged from the guide through' a smooth-or rounded-edged annular tip which is accurately centered withi'nthe bucket. In conventional equipment, the reciprocating guide may consist of a glass tube having a flared or funnel-shaped end portion for receiving 'a yarn and being interiorly constrieted at several places to reduce the contact of the yarn Iwith the'-inner walls of the tube and thus thev 'friction to which the yarn passing therethrough is subjected. Y

The tube is usually supported within anannular sleeve or ferrule constructed of lead. The lferrule is attached to the glass tubular stem by 'pouring molten sulphur between the'inner sur` face of the ferrule and outer'surface of the stem. :The 4outer surface of the ferrule is smooth and approximately cylindrical, and contiguous with Aa radially'Y extending flange which enables theA funnelf'guide to ybe'supported within asmooth bore lcfa'reciprocable bracket. On installations in'which itis not necessary to remove the funnel duringa dofflng operation, the exterior surface lof the ferrule may be threaded and permanently secured in threaded reianonship with the bracket.

The threaded surface of the f errule is Asui'liciently v:long to permit a range of verticaladjustment of 'the guide with respect to the bracket.

When using apparatus such as described above,y

cakes of'rayon are often formed in 4which yarn. of the outer layer is curly. Generally, the wavy .or curly condition of the yarn is most evident in ythe outermost layers, and is progressively less noticeable as the outermost windings are removed. Frequently, several hundred yards or more must be removed before straight yarn is obtained It is also observed that winding of the yarn around the stem of the funnel guideis most dudes-curly cakes. When the yarn starts winding either the bucket cover or thebottom of'the Not vonly must the yarn collected and the'broken funnel guide be discarded, it may be necessary to f replacethe damaged bucket. Ektremely'acc'u- ,50 likely tooccur when the spinning equipment prorate centering of the` spinning funneLalthoug'h difficultv to obtain in normal production'practice, may eliminate to-some extent the productioniof curl'yyarns. It has been noted,` however, that these objectionable winding and cake-forming conditions are more likely toy occur when the size ofthe spinning'bucket is increased; for example, it isextre'mely diirlcult to spina cake having an outer .diameter of eight inches withl conventional equipment without producing-curly yarn inthe outer windings. Reciprocating vguides having flared or bell-shaped threadfdischargingportions have been heretofore used to avoid the productionof curly filament or yarn, but have notl been generallyaccepted because of the difficulty; of removing' yarn.. .which inadvertently .became wrapped thereabout, also because of their greater vexpense and bulk, susceptibility todamage from handling, and the modification required 4in supporting apparatus therefor.

It is an object of the present invention to preventthe formation of ,curly filaments or yarns while spinning or otherwise forming filamentary packages. It` is another object `to reduce the tendency ofthe yarnato wrap about the stem of "a guide used to. direct. thestrand-into a rotary receiver. Still another .object-is to providegfa guide-lforcentrifugal spinning from Iwhich yarn occasionally wrappedthereabout'may be readily removed. Another object is to yprovide a support for 'the stem portion of the funnel whiCh supplants lthe conventionally appliedferrule of lead or other metal used in the construction of a fun- It is, also `an object to provide an nel guide. improved funnelguide of simple inexpensive construction which may be readily appliedfto y'existing equipment. Other objects, features and advantages Will be apparent from the following `description of the invention and thedrawing relating thereto n which:

Fig. lis an elevation partly in section of a guide according to the invention, a portion cfa spinning'bucket, and a conventional support for the guide; v

I Fig. 2 is an elevation view amodified guide; and i Fig. s illustrates sun another moqrnd'gaide.'

It hasv been found that-,an annular member maybe incorporated into a thread guide assembly any'. aan

3 of a bucket spinning apparatus which provides an annular thread-discharging surface of sumcient diameter to prevent the formation of curly yarn, and an outer surface from which wrapped yarn may be readily removed; moreover, the member may be used nplace of the ierrule included atheconstruction ofi-the conventional funnel guide' to support the flared-bildv tubular yarn-conducting member. Accordingly, the invention concerns a strand guide comprising an: inner thread conducting member supported with-V in an outer concentric annular' member which has an annular end surface spkaedendwise of the thread-discharging end of the inner memberL` The guide is supported along an outer surface of the outer member and may b e constructed to fit within a bracket such as 'normally provided to support a conventional funnel guide by its f=errule.

Fig. 1 illustrates a thread conducting tubular memberj/such as that to `the stem of which a lead ferrule conventionally appliedi'adja'cent tlieg'hiiared Asection 6.. However, vin 'the Apresent invention. the `need for 'such a ferrule' is' eliminat- .edlarid ithe fmember is supported' by the upper annular edges# of a tube'i 0. The lower' endp'ortionV` IZ Y of the member 5. isVV centered vwithin the .tubelhv means suesse@ Sleeve' .4 'which may y'beconstructed to fit tightly within the tube vfrom any material resistant to the'V variousI corrosive lmaterials which occurin the vicinity of the spinning equipment. w The aperturey of the sleeve `Orring I4 -is preferably large enough to provide a loose fit with the funnel stem and theperiphery :ofi the aperture may be rounded in lan axialvdirection to facilitate Vinsertion of the stem.m In order -that a strand passing through the member vil''liiay"establish sufficient contact with the end- `surface fI5 of the .tube l0, preferably the tube should 'extend in an axial direction beyond the member 5 suicient distance to maintain an angle 1A" `of v'less than'about 45V degrees `.between their axisA and th'eportion o'f yarn path-which extends between the threadedischarging ends of the 'members'. A desirable 'ratio exists between the inner diameter of the member 'l0 and the 'distance between the thread-discharging ends of 'the y.ne'mb'ers land I 0 when angle-A is4 approxi- `Vi'ral'te'ly 30 degrees. i tThethread-engaging 'end of the-'member 5 being-thus spaced-invvardly'A of the oter'member l'llin -a1direetionlengthwise thereof from--the I'sti''alrizle'nga'gin'g-^`surface |-5,..yarn bears-on the rslrfacel5 to `such an extent that this surface "m'ayfbe vconsidered ithe point of departure Yfrom the gide'forl-th'read or ya'rn being :centrifugally deposited Vwithin -'a'rotarylbucket l1. An exterirlyl threaded surface I Sp'ermits vertical adjustrment of the member l0 Within'thesleeve '20'to @settingneeded te obtain e. desiredembit ef "the endsurface--I'E with respect-to the interior of 'thejbcket The adjustment'may be fixed by tightening a Vlockr'iu't 122.V Lateral adjustment of thefgu'ides is obtained' by loosening a lock nut' 24 threadedreieuenshiprwiththe exterior threads of the flanged sleeve 'and'shifti'ngthe sleeve laterally within an aperture ofthe support arm "f5:- Theannular -clearance`21 is an outer por- `time ofthe aperture ofthe' erm'zs. The guide is supported by a conventional parallel bracket de- "vice of which' only 'thesupport-arm 25 andzportions of arms 29 and `3l) are shown.

Vl1-iig. 2- lniustrates' aeg-mue forY` centrifugal vpet fng adapted! tof be `lmounted onequipment complish dofng. A glass funnel member 5 4, which may be identical with that shown in Fig. 1, is supported within a sleeve member la. The glass member rests within the sleeve Illa by contact of the outer surface of its upper flared section 6 with the inner edge of a flange 33. The sleeve lila is supported within an exteriorly threaded sleeve 34 by Yengagement of the lower surface of vthe rim 33 iwi'tl'vthe up'p'e'rslirface of a sleeve 34. The rim 33 is flared to provide a peripheral surface by Which the guide may be gripped by the fingers when lifting the guide from `they support sleeve 34. The sleeve 34 is vvertically adjustable' in threaded relationship with respect-to theffsleeve 26a provided for lateral T'adjustment of thegguide, such as obtained with the vsleeve 20 of Fig. 1. The strand-discharging end 'of the funnel is 'centered Within the sleeve 10a 'by a collar Ida. A ring element 36 in threaded relationship with the yarn discharging end kportion of the tube lID@ provides .a wearresistant surface 37 laround fwhich the `'Si'rfand passes. The element 136 maybe abricated'frdm such materials asglas's, poreel'a'iniz'ed ceramicor metallic material,y synthetic' sapphire`,'orq1artfz. An equivalent abrasive-resistant element'maybe attached to the tube |0a` by cementing, 'orby clamping, such as by" springtens'ion in thematerial itself, into engagement With a'periph'eral surface of the tube. Any thread-guiding'tbe member according to theirveiition analog'c'iu's"v to the tube Illa may be-adapte'dr and provided with an abrasion-resistant,ring',elementl n u Fig.- 3 illustrates a modified vform of frfel guide having a necked tubular memberl I`0`b" f which the strand-discharging rim I'5b-is greater in diameter than the threaded .surface 'IB'by which the sleeve is supported. Thestem 'oftlie inner member -5 is centered with'i'nftl'ie outer member by a ring member lMblsecufred within the member IIJb. The contourof the *memberl IDU is yapproximately cylindrical .between theV rin-Sb and the threaded section |917- so that when'an-y yarn is Wound onto the guide, it windsonto tliis section and may be readily removed. The rim Vsection I5b may be enlarged to any diameter which will reduce the distance whic-hthethrea'd diameter of the completed package so that-an aperture of intermediate diameter maybe'maintained'in thebucket coverV to prevented overflow of strand through the cover aperture. *"The sleeve construction of Fig. 3 is resorted to. when spinning buckets of larger' diameters are used so as to reduce the distance through which'theyarn has to -pass between the guide vand the inner surface of the bucket or the cake. l

Sleeves such as ID, 10a, and lb maybe formed of any material resistant to 'the corrosive 'donditions in a particular spinning operation. When spinning viscose 'filaments for ez'ianiple, such sleeves may be fabricated from `matefrials such as hard rubber, ,porcelainizedmetaL .polymers of styrene or'acrylonitrilefand lva'riosllaminated fabric and Athermoplastic vor thermosettig compositions which may or may. notbeeated l with an inert materialsuchas a-s'ilioohresli.'

guides and provide anarrangement for preventingy the formation.. of curly yarniwhereby the distancebetween theeffectiv'e point lof departure ofthe fstrand from the kguide and the surface Within the .bucketnforreceiving Atherstrand may b'e maintained below that which contributes to the production 'of curly strand. Bythe present invention,` there is less tendency for thestrand tobe vwrapped around the guide when the distance between the guide andthe inner surface ofthe cake is relatively short. However. if the strand does become wrapped around the guide, the wrapped portionis not solikely tobreak as the s tems of -the conventional guidesand the yarn is `readily* removedfrom the outer cylindrical surface of'any one :of the .sleeves illustrated. The construction herein disclosed is economical and readily displaces the guides of conventional design. vvvSubstantial savings accrue from the reductionlin breakagelof the glass stemv portions of the'funnel guides as the result of the protection provided by the outer supporttubes.VV Moreover, Athe vinexpensive glass portion ofk the funnel guide may be readily replacedwhen it becomes broken or chipped without also discarding a ferrule such as that attached to `conventional guides.

While preferredembodiments of the invention have been shown and described, it is to be understoodthat changes andvariations may be ,made without departing from the spirit and scope of the invention as definedin the vappended claims.

I claim: i 1. A strand guide for delivering thread into a rotary bucket comprising an inner elongate member having a passageway for conducting the strand longitudinally therethrough and having an enlarged strand-receiving end portion, an outer elongate annular member having a surface at one end for engaging the exterior-surface of the enlarged portion to loosely support the inner member, said'outer member having an annular exterior surface adjacent the end which supports the inner member'for enga'gin'ga` support means and terminating at its strand-discharging end vvinan annular surface.v of greater diameter than the surface for engaging a support means,

v-aaidfannular surface spaced' .endwise of the .strand-discharging end of the inner member. and means supported within the outer member for centering the strand-discharging end of the inner member therewithin.

2. A strand guide for delivering thread to a rotary bucket comprising an inner elongate member having a passageway for conducting the strand longitudinally therethrough and having an enlarged strand-receiving end portion, an outer elongate annular member having a surface at one end for engaging the exterior surface of the enlarged end portion to loosely support the inner member, said outer member having an exterior annular surface adjacent the end which supports the inner member for engaging a complementary surface of a support means, an exterior substantially cylindrical surface of the outer member which is greater in diameter than the surface which engages the support means extending axially from its strand-discharging end for a distance at least equal to the depth of the bucket, said strand-dischargingk end spaced beyond the strand-discharging end portion of the inner member, and means for centering the strand-discharging end portion of the inner member withinthe outer member.

3. A strand guide for delivering thread into a rotary bucket comprising an inner elongate member havingy a passageway for conducting. a strand longitudinally therethrough, said inner member having an enlarged strand-receiving end-portion and an annularstrand-discharging end-surface,r

and an outer elongate mem-ber for supporting the inner member centrally therewithin, said outer member ,having an annular strand-engagingendsurface of substantially larger diameter Athan the strand-discharging surface ofthe inner member, said inner member extending substantially through the outer member Iwith said strand-discharging surface being spaced adjacent to, and inwardly lof. the outer memberv in a direction lengthwise thereof from, said strand-.engaging surface, and means for maintaining. the stranddischarging surface in concentric relationship with the strand-engaging surface. v, s y

4. A strand guide forv delivering thread into a rotary bucket compri-sing an inner .tubular member having alilared end-portion for receivingl a strand and an annular strand-discharging end surface, and an outer elongate annular member for supporting the inner member concentrically therewithin, said outer member having an annular strand-engaging vend-surface of substantially larger vdiameter than said strand-discharging surface of the inner member, said inner member `extending substantially through the outer vmember with said strand-discharging Isurface besurfaCe, and an outer elongate annular member for supporting the inner member concentrically 4therewithin, said outer member having a surface at one end for engaging an exterior surface of said flared end-portion and having an annular strand-engaging vsurface at the other end of substantially larger diameter than the strand-discharging surface vof the inner member,.said inner member extending substantially through the outeromember with said strand-discharging surface being spaced adjacent to,and inwardly of the outer member in a direction lengthwise thereof from, said strand-engaging surface.

6. A strand guide for delivering thread into a rotary bucket comprising an inner tubular member having an enlarged end-portion for receiving a strand and an annular strand-discharging surface, and an outer elongate member for supporting the inner member concentrically therewithin, said outer member having a surface at oneend to engage the exterior surface of said enlarged end-portion and an annular strand-engaging surface at the other end of substantially larger diameter than the strand-discharging surface of the inner member, said inner member extending substantially through the outer member with said strand-discharging surface being spaced adjacent to, and inwardly of the outer member in a direction lengthwise thereof from, said strand-engaging surface.

7. A strand guide for delivering thread into a rotary bucket comprising an inner tubular member having a flared end-portion for receiving a strand and an annular strand-discharging endsurface, and an outer tubular member having an annular surface at one end of smaller diameter than the larger diameter of said flared end-p0rtion for engaging an exterior surface thereof to support the inner member concentrically within porting# the irr'fminber concentricallythere; within, said outervm'e'iberfhavng'anendsurfaee forferig'fagirigI the exterior-'surface of` said flared portie :final-anv exterior '-'thre'adedeperipheralrsur faire' crjae'erit'fsaiiiendsurface" frf'engaging'ran 'treaded f-srfa'cebfi laisupport 'member having@ surfaceat-fone fend "for spportingithe 'inner'me'mber byitsfflaredfportion, 'aan'ge ex!- tndingradially' outwardly from? the @endl-'portion "of the`- outer 'membenadjaeent the 'end-'surface 'frl'supporting the'dnner'ffnember, said? 'outer member having an#annularstrand-engaging endL "surfaceffsubstantialiy larger' diameter thanithe Stranddisthargi'lgsurface -Of 'tlfe' inner'. member, means-'fr centeririg`- trie inner member 'Wi-thin the outermember. said-in-nerlmembe'r extending sub'- "stantia-llfyY Y`through fthe'A outer" 'member-1 with sa'id s'tra-'ddiShjrgrlgsurfacebeingv spaeedadj a'eert to; 'fardiinv'ardlyt of f* thef outer-f member inrdi.- reetinf'len'gthwise thereof 'from-, said` 4strand-exifgaging.,-'surfacegel said: outer: -member-4v having:A ra.. smooth prpheralvsurface extending-fromg-the Hnge lforI engagirrga'complementary ysurianeyof a? sportafor thewcmter/ member havingya bore complementary tosaidperipheral surfaces .y

Y 11119` 'Astrand guider-for delivering-thread.inta-a rota bucket v'comprising an: innerv elongate neiberhavng-fa: passageway for conducting; the s't'r-ani-1engtudinalyf therethrough, said inner memberslaring: aneniarged-f-end-portion 'for-reeeivin the 1lstra-nd;fanol an annular' strand-dis @fendi-surface: and-.eanfouter elongate anf nular member for.' :loosely: supporting theA inner meinber-infiid longtudinall'alignment1:therefwithn; said-immer member beinggjsupperted by engageurentf'of-:aniexterior' surface: of.itsfv enlarged prtoniwitirfanendesurfacefof the outerlmember, t'er memberhaving 'arr annular strand.- gffsurfa'oe at. itsrotlier endofsubstantially meter.' than.z thestrand-discharg-ing sur- Iie inner; member; -saidy outer member -ha ng faJsubstaiitially" cylindricalv outer surface extending;fromtsi*strande'engagingf surfacefor a distancev` atleast` 'asflongh-asf the flde'pthof the lrotaryfbeket," said: inner member extending substantially through :1 the: Youter member with tsaid "stranci-di'schargin'g:Y surface bei-ng --spacedad- -j iaeeri't?y to2- fand' 1 inwardly ofuthe -ou-terAV member afdircti'onf-lengthwiseltiereof froml said'strandengaging surface. z j JOHN=A.MII1ES.

-REFERENeEsCr-ED' "'rhfa f1-1owmgreferences arefof record m the n 'STATES PTENTS