US1918288A - Loom having a stationary weft supply - Google Patents

Description

`uly 18, 1933. w, Pool.

LOOM HAVING A STATIONARY WEFT SUPPLY Filedep- 9, 1931 2 Sheets-Sheet l WILUAM POOL INVENTOR TTOHNEYS July E8, 1933. w. POOL 33939288 LOOM HAVING A STATIONARY WEFT SUPPLY Filed Sept. 9, 1931 1 2 Sheets-Sheet 2 WiLLIAM POOL INVENTOB /MM Patented July V18, 1933 UNITED STATES PATENT OFFICE,

WILLIAM POOL, OF SPONDON, NEAR DERBY, ENGLAND, ASSIGNOR TO CELANESE CR- f PORATJGI OF AMERICA, A'CQRPORATEON OF BELAWARE LOOM HAVEN Application filed September 9, 1931, Serial No. 561,839, and. in Great Britain September 12, 1930.

inserted in turn into separate sheds.

l n this class of loom weft is supplied from a stationary yarn package and is fed to leop measuring device, the weft being secured by one of two trapping devices between which it is drawn into-leon form by travelling means adapted to pass between the two trapping devices. The weft is seized by 'the second device when the required length of ueft has been drawn, the travelling means then releasing itself from the loop of weft.

'llhe weft is then ready for insertion into the shed, the i'irst trapping device releasing its end of loop se that the limb of the loep which has been attained te that device can be ,iresnnl'ed to dummy shuttle ori other weft iris-ser' and carried into the shed. The remaining limb of the loop is afterwards .ered from the weft supply near to the .econd trapping device, which retains its heid on the end of the weft connected to the supply, and presented in turn to the inserting means, generally after insertion of a Diel; of weft from the other side of the loom. The lcon of Wett is thus laid as a hairpin in the fabric, with its two limbs in separate sheds.

ln c piel( (l limb-1, the sentation t '.ncmber is caused to enfer loop in proper position for pref n the insert-er, a loop retaining bight of the cvp, so that after insertioirof a limb of the loep the 'L passes from the ci'lggjc' of the 7 rino: beat-up and to keep the second up of the length extending from the edge of the fabric to the second trapping device round the retaining member.

Though in order to keep the vWidth of the loom to a minimum, the path of the travelmeans is arranged as near to the edge of the fabric as possible, it is necessaryrin practice for there to be a considerable gap between the nath of the travelling means and the edge of the fabric. This makes a considerable difference between the amount of weft which has to be available for the first insertion and the amount remaining between the retaining member and the second trapping device before the second insertion. This difference may be provided forA during formation ofthe weft by allowing'suiicient travel of the travelling means beyond the retaining member before release of the bight of the loop', but in View of the fact that the retaining member should be placed roughly in the line ef the :fell of the fabric so that on beat-up of the first pick the weft extends in practifally a straight'line from the far edge of the fabric through the fabric to thev retaining member, and Since release fromv .Y

the bight of the loop lmusttake place only a very short distance in frontV of the fell of the fabric in order to avoid mechanism projecting beyond the front of the loom, the amount thus available is relatively small. y

Moreover, when it is remembered that'it is most advisable to arrange that the loom can Weave fabrics of greatly differing Width, and V- that the position of the retaining member at the sideof the loom does not permit of adjustment with respectto the edge of the fabric, it will be seen that the amount of yweft available in the manner referred to aboveis inadequate for all Widths of fabric. For example, if a `fabric of considerably less VWidth is to be Woven, it Will be seen that While the amount ofvveft available for insertion of the first pick has to be reduced by an amount length adjustment which might be made corresponding to half the reduction of the Width of the fabric, a greatly increasedV distance has to be covered between the edge of the fabric and the retaining vmember after the first pick, and the amount available between the retaining member and the second trapping device for the second pick has to be reduced still more because of the increasedv member; vet at the same time itis undesii able to cii'ect the adjustment by individua-' movement of the trapping devicesA towards.

and away from the point of release of the loop, in viewofthe fact that foi-some widths of fabric the two devices would thus require to be sofar apart that insertion of the weft during'loop for-mation into thetrappingI device which for the time` beingisV open becomes uncertain. For: this reason it is important to keep thetrapping devices, whatever. the widtlrof fabric beine; weven, as oloseftoget'heras possible, preferably infact, sok close as-only toaffordzjust sufficient room foirthe passage between them of the travellingineans..

` The principal-1 object' of the present' inrention isto'enable the correct` loop length to be drawnfandi correct amounts ofy weft lo be available for the first and second pickaivbile enabling-the weft toV be engaged.' with certainty'by the trapping de iices.` A* further object` of the invention'is to enable correct measuring of theweft' to be effected without the. necessity for individuali adjustment of the trapping devices.. A still' further object of; the' invention is to .en able correction ofthe loop length to beeffeeted'by the act' of formingt'lie weft loopfitsclf.

According to= the'inventiou the weft is brought bythe travelling; means into engagement with mcans which Vformy a subsidiary loop within themainsloep during; 'the fermationiof the mainloop liythetravellinp' means,

` the extra length thus added to the main loop beingavail'able for engagement by the weft inserteron insertion' of the, first pick'.

Thus, the travelling loop-forming means may' comprise two pegs or rollers spaced apart solas to bring tlie` short lengthl of weft extending' between them' intoi engagement with. a further peni' or. roller-,the continued movement ofthe travellingpee's or rollers causing the bight endv of the weft-loopto be doubled back` intoa subsidiary loop wit-hin themainlloop; Talle-further perror roller is preferably' fixed, but; may be` adjusted relatively tothe travellingpegs or; rollers topro- ,du'ce aisubsidiary loop whose length correspondsw-ith'tho distance between the: edge of thefabric andthe retaining'membcr for alli widths of; fabric.. Compensation forthis ,differenceV being thus: provided, variation in thedength of' tlieimainA weft loopA can4` be effected by' movingthetrapping devices together Without altering `their distance apa-rl.

The loop forming means may be of any convenient form, it being,` preferred to use two travelling devicesfor engaging the weft in turn, so that While a loop is being formed by the one device, the second device is moving` into position in readiness for forming a second loop. Thus, for example,.an endless band or chain may be arranged to traverse a path in proximity to which the Weft loops are to be'formedso that pegs, rollers, ortlie lil-zeon the band or chain engage the weft betweenthe two trapping devices. Similarly one or more oscillating` or reciprocating hooked arms or rods may` be used for the same purpose.

Means may be provided 'to retain tension in the weft: thread during beat-up, after one limb ofthe loophas been inserted, themeans for this purpose being?r fur-ther adapted to be removed when the second limb is being inserted and to bedisplaced in case of accidental contact with thek travelling device.

The retaining member is preferably7 locked iii-position to maintain and cont-rol the tensionf on the first pick of weft during beatrp, andinay also be arranged to moveagainst spring: action, as described in U. S; applicationI S. No. 484,785 dated 27th September, i920, toV avoid excessive tension onthefirst pick. by movement of the trapping device holding` the end of the second pick, if movable trapping devices are used.

A weft loop havingbeen formed at one side of theloem, itis presented one limb al; af time toinserting means. which may be of the dummy shuttle type; or a rigid or Hexibl'o inserting member which carri-es the limb part way through the shed' and transfers it toY a withdrawingr member which carries it ,throughV the remainder of the shed; or a member'which. carriesthe limbfthrough thc whole of the shed.

vleft loop for-mation may take place at each side of the loom, devices being provided to` present the limbs of the loops in any desired order to the inserting means.

`The invention will nowA be described in Lgreater detail with reference to the accompanying drawings. however, that the following; description is ggiif'en by Way of example only andv is in no way limitative.

in the drawings:

Fig. 1 is a sideV elevation of the loop- ].ength adjusting means according to the in.- vention; e

Fig. 2 is an endI elevation of the mechanismsliown in Fig. 1, looking in the direction 2-2;

F igs. 3, 4 and 5 show three different positions of the mechanism shown in Fig; 1, Fig. 5 showing,` also an operating cam mechanism;

Fig. 6 is another view of the cam'mechanism of Fig. 5; and

It is'to be understood,

Figs. 7 to 10 are diagrammatic views illustrating the manner in which weaving takes place.

left thread supplied from a stationary bobbin is led to one of a pair of trapping devices mounted on a disc which is rotated to cause the weft engaged by one trapping device to be engaged by the second trapping device as described in U. S. application S. No. 484,7 dated 27th September, 1930, and as illustrated diagrammatically in Figs. 7 to 10 of the accompanying drawings. The loopforming means comprises a pair of small pegs or rollers 11 which project from an endless chain 12 which carries the pegs 11 towards the front of the loom, thus drawingI a loop of weft 13 from a stationary bobbin (not shown). The two pegs 11 which may be of capstan shape, are mounted on a transverse plate 14 attached to a small bracket 15 carried by the endless chain, the two pegs being spaced a little distance apart.

The weft loop 13 thus formed passes between the pegs 11, and at some distance before the pegs are released from the loop, the portion of the loop between the pegs engages a projection 16, so that the continued movement of the pegs 11 causes the projection 16 to draw a subsidiary loop which entends backwards from the pegs 11.

The projection 16 is attachedby means of a wing nut 17 to a bracket 18 mounted in front of the sprocket 19 round which the chain 12 turns to release the pegs 11 from the weft loop 13. The bracket 18 is slotted in the direction of the chain run and the wing nut 17 enables the position ofthe projection 16 to be adjusted in accordance with the length of subsidiary loop required. The pegs 11 extend to such a height above the chain 12 as to reach the axis 20 of the sprocket 19 as the chain 12 runs round the sprocket 19, so that the loop 13 is drawn out as far as the axis 2O and then released from the pegs.

On release of the loop one limb is present-ed to a dummy shuttle or the like and inserted in the shed, the bight of the loop being drawn back from the point of release,

.a guard 23, whose front edge may constitute the projection 16, preventing fouling of the loop on the proj cction 16 as the weft is drawn past th-e projection 16 by the dummy shuttle carrying the weft into the shed. 1n this way, the weft engages a retaining member 24 which has been inserted in the loop 13, by means to be described later, just after the passage of the rollers 11. A guard 12 prevents the weft from fouling the chain 12 as it is being pulled into the shed.

The retaining member 24 inserted into the loop by means of a toggle mechanism consisting of links 25, 26, a rod 27 and a lever 28. A toggle mechanism is operated by means of a rod 29 and a bell crank 30 which kis held by moansof a. spring 31, against the is connected .to a lever 30, actuated through .1

a lever 13() from the rod 29. The means for operating the rod 29 are shown in Fig. 5 to be referred to hereafter.

in Fig. 1 the member 24 is shown locked in position by the links 25, 26 having been brought into alignment with each other. In order to maintain and control'4 the tension on the weft, the toggles 25, 26 are released, thus allowing the finger 24 to move against the action of the sprinok33. scribed in U. S. appiication S. No. 484,785 dated 27th September, 1930, in order to avoid excessive tensioning of the weftL by movement of a. trapping device which is moving while still holding the second limb of the loop 13, the rod 29 is permitted to move to the right nnderthe action of the spring 31'to allow the linger 24 to move to the position shown in Fig. 4, tl e spring 33 continuing to maintain the desired tension on the weft. The compression of the spring 33is adjusted by means of the lock nuts 33.

Immediately before the shuttle engages the second limb ofV the loop 13, the retaining member 24 is whipped ont of the loop by a movement of the rod 29 to the right, as shown in Fig. 5.

The means for operating the` retaining member 24 is'shown in Figs. 5 and'6. The rod 29 is pivotally connected to a lever 38 pivo'ted at 39 and connected by a rod 40 to one limb of a bell-crank lever 41, the other end of the bell-c 1ank llever carrying a bowl 42 and a nib 43; The bowl 42 engages with a cam 44 rotating on a shaft 44', while the nib 43 is engaged by a supplementary cam plate 45, attached to one side of the cam 44. The weft retaining member 24 is brought into the position shown in Fig. 1 by the engagement of a quick rise 46 on the cam 44 with the bowl l42. VFollowing the quick rise 46 is a gradual drop to the point 47, at which point the nib 43 by engaging with the plate 45 has lifted the bowl 42 from the cam surface, bringing the weft retaining member 24 to the position shown in Fig. 4 under the action of the spring 31. At the point 47 and nib 43 drops suddenly over the end of the plate 45, causing the weft retaining member 24 to be whipped out ofthe loop just be- Further, as deist) by the pegs without damage to either part, the rod 34 connected to the togoles 25, 26 being capable of movement against the action of the spring: 36 to permit this movement of the finger 24. The toggle mechanism and tlie subsidiary loop forming mechanism is carried in a frame 48 which is attached to the end frame 49 and cross member 50 of the leoni, the positionof the mechanism on. the loom being indicated by the illustration in Fig. l of the sley 37, which is shown in its forward or beat-up position and not in a position corresponding to the position of the parts of the loop forming mechanism.

Figs. 7 to l0 show the sequence of operations of drawing. the loops and inserting them as picks'of weft into the fabrics on a loom provided with weft compensatingr means according to the invention. Though in these figures, moving trapping and cutting devices are shown of the type described in U. S. application S. No. 484,785 dated 27th September, 1930, it will-readily be understood thatany other form of device enabling the presentation .of weft to loop-forming means to be effected may be employed, In each figure, loop formation. at both sides of theloom isshown', one side being approximately one pick out of phase with the other.

The associated trapping and cutting devices 52, 53 and 52 53 are carried respectively on discs 51.1.51 which rotate to cause the weft to extend between the trapping devices on each disc for the engagement of the weft by loop forming devices.

On the left-hand side of Fig. 7 a weft loop comprising limbs 54, 56 has been drawn out by the pegs 1l between trapping and cutting devices 52, 53, the projection 16 having been engaged by the weftbetweenthe pegs 11 to produce a smbsidiary loop 55.

On the left-hand side of Fig. 8 the limb 54 is shown released from the trapping device in readiness for insertion into the shed, 'he retaining finger 24 having been inserted into the loop. The ri glit-hand side of Fig. 7 shows loop formation which proceeds to the extent shown on the left-hand side of Fig. 8. On the right-hand side of Fig. 8 the limb 54 is shown inserted into the fabric and drawn up against the retaining member 24.

On the left-hand side of Fig. 9 the limb 54 is picked into the fabric to follow the pick 54, and the left-hand side of Fig. l() shows the limb 56 about to be released from the retaining member 24 for insertion into the shed, it being clear that the length of the limb 54, together with the length of weft in the subsidiary loop 55, enables the weft to extend from the finger 24 to the other side of the fabric.

Following the pick 54 from the left-hand side the limb 56 of the loop at the right-hand side is pickedv into the fabric, as shown in Fig. 10. The limb 56 follows from the lefthand sidethe pick 56"., the limb 56 carrying with it into the shed the length of weft eX- tending between the pick 54 and the finger 24.

During the insertion of picks in the order above described, further weft loops arebeing produced at` the two sides of the loom. The righthand side of Fig. 7 shows weft 61 engaged by the trapping device 53 and extending back tothe supply package, not shown, about to be. engaged by the trapping device 52,. At the left-hand side of that figure, the trapping device 52 is shown moving towards the weft 6l in readiness for the formation of aloop at that side of the loom. On the righthand side of Fig. 8 av further pair of travelling pegs 11 is shown as having passed between the trapping devices 52, 53 to commence the formation of a further weft loop. The right-hand side of Fig. 9 shows this new weft loop 57 drawn to about two-thirds its full length, and the right-hand side of Fig. 10 shows it at almost full'length with the projection 16' drawing a subsidiary loop 60 as before. The limbs of this new weft loof 57 are inserted into the fabric in the same manner and order as the limbs 54, 56 of the preceding loop on that side of the loom. ln a similar manner a further loop 57 is drawn on the left-hand side of the loom by pegs il() which follow the pegs 11v in the loop forming operation.

lVhat l claim.; and desire to secure by Letters Patent is l. Veft-measuring apparatus for looms having a stationary weft supply, said apparatus comprising means for drawing a measured loop of weft, and means into engagement with which the weft is brought by the loop-forming means so as toform a subsidiary loop within the main loop during the formation of the main loop.

2. Apparatus `according to claim l, comprising a pair of travelling pegs adapted to engage the weft thread and to draw it out into a measured loop, and a further peg adapted to engage the length of weft between said pair of pegs, so that the continued movement of the pair of pegs past the further peg draws the weft into a subsidiary loop within the main loop.

3. Apparatus according to claim 1 comprising a pair of travelling pegs having the form of freely-mounted rollers and adapted to move into engagement with the weft thread and to draw it out into a measured loop, and a further peg adapted to engage the length` of weft between said pair of pegs, so that the continued movement of the pair of pegs past the further peg draws the weft into a subsidiary loop within the main loop.

4. Neft measuring apparatus for looms having a stationary weft supply, said apparatus comprising means for drawing a measured loop of weft, means into engagefurther peg adapted to engage the length of weft between said pair of pegs, so that the continued movement of the pair of pegs past the further peg draws the weft into a subsidary loop Within the main loop, and means for adjusting the position of the further peg so as to enable the length of the subsidiary loop drawn Within the main loop to be adj usted.

" WILLAM POOL.

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