US2567993A - Weft inserting device - Google Patents

Description

R. DEwAs WEFT INSERTING 'DEVICE Sept. 18, 195i 2 Sheets-Sheet 2 Filed Aug. 2v, 1948 INVENTOR Raymond Dewos ATTOFLN Patented Sept. 18, 1951 ApplicatiomAugust 27, 1948;?Seria hNoe 46;!5432 IncFrance-SeptemheriQr1947 i The invention relatestto weft-inserting devices.

for continuous-lead! weaving, looms; it concerns;

weft inserters comprising a holding member withv auresilientclampand more especially the holding member with. a resilient-clamp of f the.v

pulling needles of the type describediand'illfis;

trated in the-applicantsU. SJPatent No.. 2',1l9',57'3" granted .June: 7,- ;1938, saidctype .of needles bein providd,,on one. or. oneboth' of. the. arms or branches oi the resilient-clamp, withmeans for. enabling. 'the,weftthread which comes from the stationary bobbin andflwhich. nipped by, the" clamp, .to come. into contact .with the outer face of the resilient arm,- said means,- in. addition .to. their) not preventing; the releasing blade from. passing, enable the. thread,' stretched between the bobbin .and' the. point. of nipping, to produce automatically of its own accord, while it is. unwinding, and.by the actual effect of its tension,

an increase of' pressure; of" the. resilient arm.

against th rigid. arm and. consequentlia. an. in-

crease inthe clamping. force-at; thelpjoint" of nipping, proportionally to. said.' tension The invention. relates iniparticular to. the case in which said meansare. adapted to effect the exchange. of. the thread? b'etween' the conveyingj needle. and. the. pulling. needle .at" the moment" prise, interalia, the.arr'angen'ient', on the edgeof the resilient arm located'opposite the felloffth'e cloth; of'alater'arnotch extendedby' a longitudinalslit; the ,portion cutioutiformin'g an up? tiirn'edf t'ooth directed? towards the. rear ofth'e" clamp. fPractice .has shown that. in .this. type .of'. pull mg needle, the front portion ofltheresilihtarni".

isweak and "comparatively; fragile, thereby mak; ing, it able. to .hecome...deformedl' and'tov break.-

Furthermore; the sliding of" the weft thread suppliediby the conveying needle is efiected'bv'er the'fupturned' tooth;.. which .causesa' fatigue: of"

thjethreadi .On the. other hand,. it. sometimes" happens; owing? to. a faulty... adjustment. of the clamp, that the freeendfof fthe. thread tends, byfthepulli'r'ig.

forceito place .its'elfi' in alignment'w ith the portion .co'mingirom the bobbin and is". thus name:

toescape from thehook.

provide additional. iriiprovementsv in the mamh'e'rsin question.

Flor thispurpose. the. invention provides; provementsnin they construction...off the resilient clamp of, the aforesaidltypfi .01. pul1in'g, needle},

and more particularly in..the' .construction" of 'its'ii resilient armor branch, said. improvements. being;

mainly characterizedb'y thefact" that "the front portion of the resilient arm is provided" with an anglesectionon each offits. sides; the downwardly. directed: .wi'ng. ofi'theangl'. on .tlie".reed"sid 1ed'ge extendingwover. a-,comparatively;1 great'ilength; .on'

the one handftoward's'lthe ,rear,',beyondthe zone containing the..upti1rried; tooth, and; the lateral notch, .and'ion..the othenhand'ltowfldsthe front';; so'-as.to.iform the. tip,.or: noseof, saidi resilient arm, whereas theupwardl'ydirecte'd wing 'of "the" angle. on. the .fell. side .edge is of smallerilngtlr and.- extends from the? froirit endjiof, said edge'ito the tip of the ito'oth;

' According; tor aribtheri 'featureof .the' invention; the. end'ofQ'tlie f resilient, arm* extends ibeyon'd" the: end of the. rigid, arm; which; intenali'a; offers the? advantage of enabling the distancebetween" the tip, of the guard and. the point of nipping. ,of the thread tobefdcreased.

Accordin'gto anotherfeature-tottheinvention: the angleon thefellsi'de edgeexterrdsto: the'tip ofthe tooth? therebyjm'aldn'gj saidtooth undeforma'ble and enabling ititdhe'tgiven thefshape' of ahook, the tip"of wliich.isbent towardethe According" to anotherfatnremfthe-invention; the" width of the .front portion" of the resilient-' arm is" decreased; which is? mad'epossioleby theadditional strength imparted b'y the angle-- seer-- tions,-- andenablesa: pulling clamp to' be obtained wherein the front portion, a'long whi'ch'the weft" thread"passes'atthe instant when the exchange is taking place, is narrower. Y

Accordingqto-anotherriatine off'theinvention. at 'abotifitheihei'ghfof o1"in'line"with:.'theb0ttonr of the slit" extending the lateral notch; a? mew is providedon theoutside, which straddles the angle ofthe angle'section' on-thefllsid edge, said nick forming, with the face of 'ther rigid arm against whichthefrorit portion of the r'ee silient arm bears for nipping the thread; a' hind oi: stopqi'otch which *faci'li-tates' the exchange-and fixes the position OFthe fiee-emd oFthe thread? According ttr a furthenfeatm'e of the inven tion, thestopmotclr m'a=y;-* be provided onthe rigid arm; or two-stop-notches"may heprovidedf one on the resilient arn'r and the otheroir therigid arm;-

Owing "to these" improvements? providd' in the" resilient clamp of the pulling needle: itwill" beunderstood, in particular as regards the angle sections, that the one on the reed side is chiefly intended to compensate for the lack of strength of the resilient arm, and the angle section on "the fell side fulfils two main purposes: it renders the hook rigid and remarkably facilitates the sliding of the weft thread owing to the fact that said Weft thread does not have to hoist itself, so to speak, along said hook, so that the weft thread is still less fatigued and the safety margin in the longitudinal direction, which is necessary for the thread to be caught reliably by the hook, can be reduced to a strict minimum.

It will also be understood that by bringing the tip of the hook closer to the reed, and consequently to the guard, a further protection is obtained, all other things remaining equal, against an untimely penetration into the hook, of the warp threads which are pushed away by the guard.

It will further be understood that owing to the decrease of the width of the pulling clamp in the front portion thereof through which the weft thread passes, the margin is increased between the pulling clamp and the surface of the head of the conveying needle.

On the other hand, it should be noted that the elimination of the resilience of the front portion of the resilient arm owing to the provision of angle sections produces particularly important results, the applicant having found that the adjustment of the clamp is facilitated thereby and the life of the releasing blade is prolonged to a considerable extent, whereby many advantages are procured.

In order to enable the invention to be clearly understood, an embodiment of a pulling clamp of the type specified, involving the application of said improvements, is described hereinafter and diagrammatically illustrated, by way of a nonlimitative example, in the accompanying drawings in which:

Fig. 1 is an elevational view of the improved resilient arm on the side facing the fell;

Fig. 2 is a top plan view thereof;

Fig. 3 is a perspective view, showing separately, before they are assembled, the rigid arm and the resilient arm, and also the guard;

Fig. 4 is a perspective view, showingthe rigid and resilient arms assembled to one another, forming the improved resilient clamp, and also the guard, the assembly being shown mounted at the end of the arm of apulling needle;

Fig. 5 is a view in transverse section along the plane VV of Fig. 4;

Fig. 6 is a view'in transverse section along the plane VI-VI of Fig. 4;

Fig. 7 is a plan view, on a larger scale, of the front end of the resilient clamp, showing the position of the thread during the pulling operation;

Fig. 8 is a similar view to Fig. 7, relating to a modification, and

Fig. 9 is a view in section along the line IX-IX of Fig. 8.

According to these figures, I is the resilient arm or branch, 2 the rigid arm, 3 the guard, 4 the arm or stock of the pulling needle, made of moulded plastic material for example, and the end of which is suitably shaped to enable the rear ends of the rigid arm 2 and of the guard 3 to be mounted and fixed thereon; 4 is the groove provided laterally over the greater part of the length of thestock 4 in order to form a passage for the releasing blade, not shown, which 4 is mounted on a support located outside the shed, near the selvedge, said blade being intended, when the pulling needle is coming out of the shed, to separate the two arms I and 2 of the clamp and thereby release the end of the weft thread which is nipped between them.

The resilient arm I is fixed at its rear part I, by means of screws or otherwise, in the rear part 2 of the rigid arm 2, and is adapted to bear resiliently, by means of its front portion I, against the front end 2 of the rigid arm 2 so as to nip the weft thread.

As already stated, the improvements provided in the resilient arm relate particularly to the front portion I thereof.

They are characterised in that said portion I forms, opposite the reed, a right angle, the wing I of which is directed downwards. Said wing is extended and forms the tip with an inclined ramp I which extends beyond the end of the rigid arm 2. The portion of weft thread, stretched between the resilient clamp of the conveying needle and the support of same, slides over said ramp, straddles the upper surface of the resilient arm up to the tooth I when the two needles meet one another.

Opposite the fell, the portion I of the resilient arm forms a right angle, the wing I of which is directed upwards and extends from the tapered end I to the tip I of the tooth-shaped cut out portion I that bounds the longitudinal slit I extending the lateral notch I The slope I on the reed side edge I thereof, is of increased length, which reduces its slope and enables the thread coming from the bobbin, once it has been caught by the hook I to pass readily over the end I and assume its self-tensioning position.

The end of the angle section I forms the hook I which extends above the slit I Finally, at the height of or level with the bottom of said slit I is provided a nick I that straddles the outer angle of the resilient arm I opposite the fell. Said nick (Fig. 6) extends over a portion of the height of the outer face of said resilient arm and also over a portion of its inner face in contact with the upper face of the portion 2 of the rigid arm. The weft thread 5 is stretched, while it is being pulled, between the feed bobbin and the point of nipping passing through the bottom of the slit I where it forms a bend; the movement of its free end 5 by sliding owing to the pull, and consequently the straightening out thereof in alignment with the portion coming from the bobbin, which might cause the thread to escape from the hook, are prevented by its engagement in the nick I which forms a stop-notch.

In the modification shown in Figs. Band 9, the resilient arm I is provided on its upper face with a boss I which is provided with an approach ramp I extending alongside the slit l Said boss then passes round the bottom of said slit and merges obliquely into the wing I of the angle section which it encounters at I Owing to this arrangement, the thread 5 caught by the hook" I mounts the boss by means of the ramp I the oblique shape of said boss constraining thev thread to continue to move up to .Iiwhereby as soon as it is stretched between the clamp and side facing the fell.

outer face of the resilient arm in a zone which is closer to the fell side edge and therefore at on the reed side is decreasedinwidth fthereby I theepolnt where theiseiietensiomng emreeisefi tneihottemr ithez rm nds in'inaonne i e the greatest eflicacyi efiurthernappreeiahlit nteet on 9! 3 3 1 Pa Qf:-.,. h.e tee h... a crease;iior;a given. tensioning'foree-of theolamp th'hQl-Il bent. .towen tile-item thez safe'guard against. an untimely slippingmofi o rl e-nettethethreadiinstheclemp.- v 5 -leit if ;;d Vi r 1 .9 2

-:l2he .boss; may. originate; C1OSeI..l70.:.l7heJhOQki weavin looms-havin a r i I. In this case, it may overhang the bottom th v ;i of the-slit. Ia 'so..tha.t..-the point I may be cated approximately at the height of the bottom of said slit i 1 g as -regards the rigid-arm 2,, its f-r-rmtportion onti nuges;

I it dweavinaloem: ar eider :p

involving t eli in tion o the nn l section eenl ee mnrris nge ninn nermembeena 1 2 (Fig. 3) over a certain'length so as to leave resilient. arm -having. a tooth, and a. ico ac n room-for the angle sectionw-l of the resilient. lateral ,notch, an arm L. Said frontportion ofthe rigid -arm z the notoh on may be provided with a recess 2 formed for cloth, and further having an angular section on example in the manner shown in Fig. 9, for the side opposite the rigid arm and a substanfavouring the removal of the impurities pushed tially narrow portion through which the weft back by the releasing blade. my thread passes at the instant of exchange.

As regards the guard 3, the same is reinforced 5. In a weft inserting device for continuous by right angle flanges 3 and is at the same time feed weaving loom having a pulling needle comlightened by holes 3 prising a m'pping member having a resilient arm,

It is of course to be understood that, without the arm having a tooth and a coacting lateral exceeding the spirit of the invention, it is pos- 5 notch and a longitudinal slit extending the sible to make improvements, modifications and. notch on the edge facing the fell of the cloth, additions, and also to consider the use of equivathe arm further having a second notch on said lent means. edge aligned with the bottom of the lateral notch For example, as hereinbefore stated, the stop and adap ed t prevent the thread from escapin notch I may be provided on the rigid arm 2, so from the tooth. as shown at 2 (Fig. 3), or the clamp may be 6. In a weft inserting device for continuous provided with two stop notches such as I and 2 feed weaving loom having a pulling needle comrespectively. prising a nipping member having a resilient arm,

Likewise, the boss I after it has passed round Said arm having a tooth n e en c in lateral the bottom of the slit may encounter the angle neteh and a longitudinal Slit extending t e notch section I for example at right angle, while on the edge facing the fell f the 1 t a rigid gradually decreasing in thickness, so that the arm against Which the front po of t e rethread 5 caught in the hook and having mounted, silient r b r the rigid m h vi g a n t h by means of the ramp the boss In, extends on said edge aligned with the bottom of the londownwards again in the direction Of the angle gitudinel Slit O e resilient m When S cu ed section I so that in this case again, as soon as thereto and adapted to form with the resilient it is stretched between the clamp and the bobbin, arm a stop notch. it is shifted sideways towards the fell side edge. In a Weft inserting device for on inuous In this case, the boss may also overhang the e Weaving 100m having a pulling e d e 00mbottom of the slit I prising a nipping member having a resilient arm,

Such arrangements of the boss, or any other Said am having a tooth and a meeting lateral sijnflar arrangements tending to produce the notch and a longitudinal Slit extending the notch sam result, may of course be applied by way of on the edge facing the fell Of the 010th, the resiliimprovements to the boss I3 of the resilient arm ent arm further having a Second notch on said 5 of the resilient clamp 0f the pulling needle dee aligned with the bottom of the longitudinal scribed in the applicants aforesaid patent. it; a rigid arm against which the front of the 1 1 m; resilient arm bears and adapted to nip the thread,

1. In a weft-inserting device for a continuous the rigid arm having a notch on a e e and feed weaving loom having a front, a pulling neeadapted to coact with the second notch of the dle comprising a nipping member having a re- 55 s e t arm When Secured thereto. silient arm, the arm having a tooth on the edge 8. In a weft inserting device for a continuous facing the fell of the cloth and an angular secfeed weaving loom having a front and reed sides; tion on the front portion intermediate the tooth a pulling needle comprising a nipping member and the bottom of the arm, the downwardly dihaving a resilient arm with an angular section; rected wing of the angular section extendin to a rigid arm against which the front portion of from the apex thereof to the bottom, the upthe resilient arm rests, the edges of the front wardly directed wing of the angular section exportion of the rigid arm on the reed side being tending from the apex thereof to the tip of recessed, whereby said front portion is narrower the tooth and relatively shorter than the downthan the rear portion of the rigid arm. wardly directed wing. 9. In a weft inserting device for continuous 2. In a weft inserting device for continuous feed weaving loom having reed sides; a pulling feed weaving loom having a front and reeds, a needle comprising a nipping member having a pulling needle comprising a nipping member havresilient arm; a rigid arm, means securing the ing a resilient arm, the arm having a tooth and resilient arm to the rigid arm and adapted to a coacting lateral notch and a longitudinal slit (0 provide a nipping member for the weft thread, extending the notch on the edge facing the fell the opposed face of the rigid arm being provided of the cloth, the arm further having an angular with a recess on the reed side. section on the front portion on said edge inter- 10. In a weft inserting device for continuous mediate the tooth and the bottom of the arm feed weaving loom having reed side edges, a. and extending in one direction downwardly to pulling needle comprising anipping member hav- 7 ing a resilient arm, the arm having a tooth and a coacting lateral notch and a longitudinal slit extending the notch on the edge facing the tell of the cloth, the front portionof the resilient arm between the bottom of theslit and the bottom of the arm sloping toward the reed side edge. 11. In a weft inserting device for continuous feed weaving loom having a pulling needle comprising a nipping member having a resilient arm, the arm having a tooth and a coacting lateral notch and a longitudinal slit extending the notch on the edge facing the fell of the cloth, the arm further having on the upper face thereof an angular section intermediate the tooth and the bottom of the arm and a boss, a ramp -for the boss, the ramp and boss extending alongside the longitudinal slit and the bottom thereof to merge obliquely with the angular section.

12. In a weft inserting device for continuous feed weaving loom according to claim 11 in which the boss is characterized by gradually decreasing in thickness toward the edge facing the tell of the cloth.

4 RAYMOND DEWAS.

REFERENCES CITED Name Date Number Dewas Nov. 3, 1936'

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