US2354284A - Pneumatic thread holder - Google Patents

Description

July 25, 1944. R. G. 'ruNER PNEUMATIC THREAD HOLDER Filed March 23. 1942 Hlm-IARD G:TURNER ATTORNEY Patented July 25, 1944 f UNITED sTArES .PATENT-:orales `v Application March 23, 1942, serial No. 435,875vv 7 Claims.

This invention relates tol pneumatic thread holders for weft replenishinglooms andit is the general object to provide means by which the thread holder is adapted for use with both coarse In my prior Patents Nos. 2,199,353 and 2,199,354 I have shown pneumatic 'thread holders for creating tension on the weft ends extending from reserve bobbins in a weft replenishing loom. As heretofore used the intake mouth of the thread holderl has been of xed cross-'sectional area proportioned to operate with ne '.yarns. When coarseyarn is usedin suchathread holder and the magazine is provided with a full complement,

of reserve bobbing the weft ends` occupy so much ofthe intake mouth and airpassagebehind it that the small amount of air. which can get through the unobstructed passage is insuincient for proper operation. As .a result' of this condition a thread holderwhich operates'satisfactorily with small yarns will not operate successfully on large yarns. The reverse condition is also found to be true, namely, that vif the.l thread holder is made' Vsuilciently large to operate properly en 725 backward motionof the lay creates a partial vaclarge yarns there is uncertainty in its operation on small yarns due to reduced pressure caused by the large mouth. For successful loperation there appears tobe a rather limited range in the re' lation which the cross-sectionaljarea .of the threadreceiving passage bears to the volume of yarns obstructing the passagei It is an impor' tant object of my present invention to provide means by which the effectivejcross-sectional area of the pneumatic thread receiving passage can bevariedto accommodate the particulartype of yarn being used 'in a magazine.

The pneumatic thread holder is generally used in vconnection with av thread accumulator located in'such position as to cause the threads to extend along'one side of the pneumatic.passage It is" a further object of my ypresent invention to provide the oppositeside of the pneumatic passage with .means by which the eiective crosssectional area ofthe passa'gemaybe varied. By

this relationship the means employed to effectI the adjustment doesnot interferewith the pas'- sage of threads along thatpartfof the passa-ge whichthey generally occupy.

With these and other objects in appear as the description proceeds, my invention.

resides'in the combinationand varrangement of parts hereinafter .described andjset forth In the accompanying drawing, wherein a con- Venient embodiment of my. inyention is set forth.

Fig. 1 is an end elevation ofa portion of a loomV viewwhi'ch win having applied thereto a thread holder made according to my present invention,

Fig. 2 is an enlarged front elevation looking in the direction of arrow 2, Fig. 1,

Fig. 3 is ahorizontal section on line 3-3 of Fig z ,"Fig.'4 is an end elevation looking in the direction of arrow 4, Fig. 3 showing thethrea'd'holder being used with small diameter or ne yarns,

Fig. 5 is a vertical section on line 5-5 of Fig. 3,

Y Fig. 6A is a Verticalsection on line 6- -6 of Fig. 3, andv` v .I

Fig. l isa view similar to Fig. 4 but showing the thread holder associated with large diameter v' or coarse yarns. Y

Referring to thedrawing, I have shown a loom frame IIJ havinga layv II which reciprocates backwardly and forwardly by l means of a'connector I2 driven by the top'or crankshaft I3'.

A pump cylinder I4 is secured to the frame and is provided with a. piston I5 the connector I6 of which is attached to the upper end of a lever Il pivote'd at its lower' end as at I8. An operating f W, rod I8 connectsftheleverTI to the lay II so that or Ythe like designated'at'2`2 'having anvintake mouth 23 which faces preferably toward the cen-v tei-"of the loom. The`base'2i' Ireceives the'lower` In, end ofi a cylinder 24 made preferably of trans- 35I parent material. Acap 25 for the cylinder re` ceivs the forward veridoi'a pneumatictube 26 the rear end 'of which is'connected as at 2l to the interior of the' pump I Il.v 'Athread vand air` passage extending throughitube 22 connects di the 'intake f mouth z3 with the' interior 'of kthe cylinder 24 and duringfbackwardmotion of the lay 'the pumpl acts through the 'tube 2 6 rto create near the center of the cylinder 24.v The threads are generally disposed as shown in Fig,v 3, that is, A 50 theyextendalong therear part ofthe passage 3Q.

The replenishing .mechanism R.,comprises a magazine f rarne whichlrockson a iix'ed pivot 36 by means of a trainoi mechanismincluding link 31, leve1 38 and asecondjlink'39. The pivot miD 36 ifs-mounted cna foot-"40 ywhichis secured to the loom frame. Transfer mechanism T includes a transfer latch 42 normally below the path of a bunter 43 on the lay and pivoted to a transferrer arm 44. The magazine is provided in the present instance with front and back stacks 45 and 46, respectively, of reserve bobbins from which extend weft ends W. It is these weft ends which extend to the intake mouth 23 and lie along therear part of Ithe passagefll to be entangled With the thread lmass M within'the cylin-l der 24.

The matter thus far described of itself forms' no part of my present invention and may be made as set forth in the aforesaid patents.

Depending upon the kindz of -fabric being'. woven in the loom the magazine may be pro-,j` vided with bobbins wound either with fine or When ne weft is lemployed it is coarse weft. desirable that the effective cross-sectional diameter of the passage 30 be relatively small so that suiiicient draft will be created to suck the weft ends into the passage. Whencoarse yarns are used, however, it is desirable thatthe passage 3S be altered so that its effective. cross section will be enlarged to prevent excessive obstruction by the coarse weft. In order to accommof date these conditions I provide the tube 22 with a forwardly extending hub 50fthreaded at 5I to receive the threaded shank. 52 of an adjusting screw 53 having a. thumb head 54. The periphery of this head may be provided with va series of notches 55 for cooperation with a spring detent 56 secu-red as at 51 to thebase 2|. The rear part of the threaded shank of the screw is positioned to move across the passage 30. The latter is made amply large to operate .successfully with coarse yarns when the screw is in its out or forward position so that thefull cross section of the passage is availablefor both the yarn and the passage of air. When fine lyarns are employed the .screw is turned so asrto move rearwardly and` thereby 'reduce `the effective cross-sectional area of the passage 3l). The first .of these conditions, that is with coarse yarns,

Fig. 4 fine yarns are indicated as occupying only` a small part of thepassage 30, in which case the screw is moved to its rearpositionto reduce.

the area of the passage. The detent 56 will hold the screw in any of its adjusted positions, and the operator may turn the screw while the loom is in'operation if necessary.- Y This latter operation may be desirable when the coarse yarns are beingused, since `depletion of the number of bobbins in thema'gaz'ine Rwill enlarge the unobstructed area of the passage 3D, in which case thescrew'may be moved fromthe positions of Figf'l toward the'positions 'of Fig. 4.

From the foregoing it will be seen that 'I have provided a simple'means by which the effective cross-sectional area of the thread pasl sage off a pneumatic thread holder Vmaybe varied to accommodate the size of'weftbein'g used. It will also be seen that the screw is' onthat side of the passage 301opposite the ,side along which the weft endsW tend normally tolie as they pass from the intakemouth to the interior of the cylinder 24. It will further beseen that vpro.-`

ytend, a pneumatic thread holder having a pas- `sa`ge therein to receive the weft ends, means to induce a draftcf air into said passage away from the bobbins to attract the weft ends, and means `movable laterally into said @passage to assume Y a"plural ity of positions in said passage to elect avariationiin the eiective cross-sectional area cf said passage.

2. In a weft replenishing loom having a group of reserve bobbins from which weft ends extend, a pneumatic thread holderv having a. passage therein to receive .the weft ends, means to induce a draft of air into said passageway from the bobbins to attract theweft ends, and means movable into said passage laterally thereof .by which the effective cross-sectional area .of said passage maybe diminished as the .number ofbobbins in said group is decreased.

3. In a weft replenishing loom having'argroup of reserve bobbins from which weft ends extend, a pneumatic thread holder havingA -a passage therein to receive the weft ends, means to induce a draft of air into said passage away `from the bobbins to .attract the weft ends, said'holder having a threaded bore communicating with the passage, and threaded means in said bore and movable therein to diierent positions in said passage to vary the effective cross-sectional area of said passage.

4.Y In a weft replenishing loom having a group of reserve bobbins from which weft ,ends extend, a pneumatic thread holder having a passage therein to receive the weft ends, means, to induce a draft of airinto said passage away from the bobbins to attract the weft ends, said holder having a threaded l.bore `communicating 'with the passage. threadedmeans in said borejmovable therein to different positions in said passage to vary the effectivecross-sectional areal vofsaid passage, and means to hold said threaded means and prevent turning thereof with respect vto said threaded bore. l, I

5. In a weft replenishing loom having a group of reserve bobbins from which weft vends extend, a pneumaticthread holder having a passage therein to receive the weft ends, means to induce a draft of air into said passage -awayfroirn `the bobbins to attract the weft ends, said thread holder having a .screw threaded bore therein communicating with the passage, a threaded member located within the bore and movable-.- therealong to project differentv distancesl into said passage to vary the effective cross-sectional area of said passage, and a hand hold on said member by which the latter may be .turned'in said bore to vary the distance by which said.

member projects into said thread passage.

in a direction, away from vthe bobbins, and means located at that side of said passage oppositesaid one sidey mov-,able to differentpositionsiri said' in a direction avvay from the bobbins, means movable laterally with respect to said thread passage into the latter from the side thereof opposite said one side to vary the effective cross' 5 sectional area of said` passage..

y HARD G. TURNER..v

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