US2668560A

US2668560A - Device for weaving of fabrics

Info

Publication number: US2668560A
Authority: US
Inventors: Svaty Vladimir
Original assignee: CESKOSLOVENSKE TEXTILNI ZD Y
Current assignee: CESKOSLOVENSKE TEXTILNI ZAVODY; CESKOSLOVENSKE TEXTILNI ZD Y
Priority date: 1949-04-02
Filing date: 1952-01-15
Publication date: 1954-02-09
Anticipated expiration: 1971-02-09
Also published as: BE494789A; AT185318B; GB693751A; CH285745A; FR1018805A

Description

Feb. 9, 1954 v. SVATY 3,568,560

DEVICE FOR WEAVING OF FABRICS Original Filed April 3, 1950 4 Sheets-Sheet l L a Q INVEN VLADIMIR S Y Feb. 9, 1954 v. SVATY 2,668,560

DEVICE FOR WEAVING OF FABRICS Original Filed April 3, 1950 4 Sheets-Sheet 2 "IIIIIII/II/IM INVENTOR. Vmwmn? SVATY Feb. 9, 1954 V.,SVATY 2,668,560

DEVICE FOR WEAVING OF FABRICS Original Filed April 3, 1950 4 Sheets-Sheet 3 "F" A mmw INVENTOR. VLADIMIR SvATY libb Feb. 9, 1954 v, sv 2,668,560

DEVICE FOR WEAVING OF FABRICS I Original Filed April 3, 1950 4 Sheets-Sheet 4 ilgf INVENTOR. -AOmng SVATY 'tensioning means.

Patented Feb. 9, 1954 DEVICE FOR WEAVING OF FABRICS Vladimir Svaty, Roztoky, near Jilemnice, Czechoslovakia, assignor of seventy-five per cent to Ceskoslovenske Textilni Zavody, narodni podnik, Prague, Czechoslovakia, a company of Czechoslovakia Original application April 3, 1950, Serial No.

Divided and this application'January 15, 1952, Serial No. 268,427

Claims priority, application Czechoslovakia April 2, 1949 6 Claims.

The present invention relates to a method and device for weaving of fabrics.

This application is a division of my copending application Serial No. 153,507, filed April 3, 1950.

The manufacture of fabrics on mechanical weaving looms as hitherto carried out is a rather slow operation, the average speed of which cannot practically be increased above 190 picks in a minute on fully automatic looms. Such looms are highly complex, costly and, as known, too noi y in operation.

The main object of the present invention resides in a substantial acceleration and simplification of the weaving operation. For this purpose the inserting (picking) of the weft thread into the shed by means of an air jet is made use of. The invention aims further to a substantially simpler and at the same time more efiicient arrangement of a pneumatic weaving loom,

According to the invention the weaving operation is effected in such a way that one or a plurality of weft threads are inserted into a conventional shed of warp threads either from one or from both sides of the Warp by means of air jets surrounding and entraining the weft thread or threads. The required rotation in the direction of twist of the weft thread is preferably imparted to such jets so as to prevent tearing up the thread and to smooth the picking motion.

The leading portion of each picked thread is retained at the opposite side of the warp by a marginal binding for instance by a gauze-like crossing, i. e. binding of the Weft and warp threads at the margin of the fabric, Whereas the rear portion is clamped by tensioning means and, if necessary, additionally secured also by a marginal binding, whereupon by a blow of the reed the weft thread is tensioned under simultaneous braking of the leading portion by the marginal binding and clamping of the rear portion by the The thread is finally out off, the shed changed and the weft thread Woven in. For the purpose of achieving uniform and perfect results as well as economical use of the air the individual batches of air for each picking motion of the weft thread are adjusted exactly to a quantity which is just sufficient for causing the front wave of the air jet, by its impact against the free end of the weft thread, to straighten out the thread and impart thereto a suitable acceleration producing a flying movement, whereupon the pressure gradually drops. By this drop of air pressure at the discharge portion of the nozzle there is prevented the imparting of greater ve- ,locities to the rear portions of the weft thread,

receiving the picking movement later, eliminating thus the formation of loops in the weft thread.

According to a further development of the new method the weft thread is first unwound from a storage source in the requisite length, subjected to the entraining influence of a jet produced by a predetermined batch of compressed air, driving the wound-off portion of the thread through the shed, the thread retained at the end of the fabric remote from the nozzle and tensioned by a pull acting in a direction opposite to the direction of the picking movement and after having been woven in it is cut off and its free end retracted towards the nozzle,

A device for carrying out such weaving process corresponds to a mechanical loom insofar as there remain the driving means for the warp, whereas the operating means for the weft, including its safety catches (weft stop motion) are replaced by a pneumatic apparatus for inserting the Weft into the shed, as will be described later. The operation of such a pneumatic loomis noiseless, cheap and very quick. With approximately half the input of driving force about double the number .of pickings, or even more may be achieved as compared with hitherto known looms.

In another embodiment of the device for'carrying out the improved method there is arranged in front of the nozzle a pair of cooperating retracting rollers engaging the thread, said rollers revolving in a sense so as to impart movement to the thread opposite to the direction of picking and in one or in both rollers a relieving-recess is provided, said recess being adapted torelease the thread from engagement with the retracting rollers in the moment of operation of the air nozzle.

One or both retracting rollers are preferably yieldingly mounted so as to allow for irregularities in the thickness of the thread.

In the supply of compressed air a throttling valve is provided, and a storage chamber for compressed air interposed between the throttling valve and the nozzle, the throttling valve admitting into the chamber such amount of air only as is required for one picking operation.

Several examples of devices for weaving by the method according to the present invention are shown in the accompanying drawings wherem:

Figure 1 is a diagrammatic sectional view of an example of the weft inserting means;

Figure 2 shows a detail of the nozzle;

Figures 3, 4, 5 and 6 show the succession of the individual phases of operation in diagrammatic representation;

Figure '7 is a cross-sectional view of a modified nozzle and its simplified driving-mechanism;

Figure 8 is an elevational view thereof;

Figure 9 illustrates an axial cross-section through one embodiment of the device;

Figure 10 is a front view of a 'portionuof the device;

Figure 11 represents on a redueed scalea side view;

Figure 12 illustrates a diagrammatic elevational view of a modified embodiment;

Figure 13 illustrates a further modified embodiment;

Figure 14 shows another embodiment 'ofthe winding-off device; and

Figure 15 is a front view ofthe-loomshowing. the overall arrangement of the device according;

to the invention.

Referring first to Figures 1 to 6, it may-be seen-- that from a storage bobbin 1 the weft thread 2 is wound off over a small weft brake ,3. In order to. .eXactlyadjust the-requisite. length. of the thread a winding-off apparatus is used, ;consistingsin this case of a pair of, pressure rollers 5, 4 ofwhich the lower roller 4 has a rough surface or, isv coveredawithv velvet- Its circumference may correspond approximately, to the so called reed widt; ofthe fabric, so that one revolution thereof will supply the requisite length of weft thread. It may be driven from a side by means of africtiondisc 6,;mounted'for adjustment .on its shaft 1, driven by the main shaft 8 of the loom. The upper pressure roller 5 isloaded by a spring 9.

Behind the windingeofiaapparatus the thread passes through suitable tensioning means H], II the upper jaw ID of which is rigidly mounted whereas the lower jaw. H is biassed against the upper jaw in by a spring l2,supported in a rigidly mounted casing 13.. Atwoearm lever M is journalled at the low free end of. the said jaw H, said lever 14 being operated by a cam 'disc E5 on a shaft 16 which is driven from. the main shaft of the loom, for instance by a chain, or by a. gear transmission.

The weft thread is finally passed through an axial cavity in avalve body 11 of. anain nozzle. The nozzle body .I 8 is provided with a mouthpiece is into whose orificea sharp edge of the valve body .i'l projects. Intov the annular path of air, arranged preferably according to-the principles of.a.-De Laval nozzle,-there is secured near. the mouthportion a stationary blade wheel 23 consisting of-tangentially inclined blades deflecting the air, similar to adistributionwheel of a turbine (shown diagrammatically in Fig. 2), by which rotation isimparted to the air jet... Th -.cavity in the nozzle body I8 is in open connection. with a-storage chamberv M for compressed'airconnected over a throttling valve 22 with a source of pressure medium; The chamber-2| -may be provided with adjustable. walls for the adjustment of the volume thereof to a quantity of air which is just required for one picking operation. The valve body 5? is mounted for sliding movement in longitudinal direction of the nozzle body I8 and has at its free projecting-end a flange 23 engaged by a bell crank lever--24. The latter is journalled at 25 and provided with a'follower roller 26 at its free end, which rests against the circumference of a cam disc 2?, connected with the disc [5 on the shaft 16;

The device described above operates as follows:

The prepared. portion of the weft thread is supplied by the continuously operating winding- 4 oir' mechanism always infront of the clamped tensioning means it, i i. and {the leading portion of the weft thread 2 "projects from the orifice of the mouthpiece it of the nozzle 58 after having been cut off from the weft previously inserted, see also Fig. 6. In the first phase of op- V eration, Figure 3, the valve I? of the nozzle 18 is temporarily opened by the influence of the projection 2? on the cam disc 21 acting on the follower roller is of the lever 24 and the emerging jet of compressed air, accumulated in the chamber 2i tensions the weft portion 2, remaining after the weft has been cut off, and directs it to the shed. In-theimmediately following phase, Figure =4, the projection If! on the cam disc 15 abuts against the free end of the lever M; the clamping action of the lower jaw ll of the tensioning means is temporarily released setting free the clamped thread 2 in a length previously wound-off, for flying through the shed under the tensioning influence of the air jet.- In the further phase, Figure 5,,the-leading portiomofthe picked threadis retainedatithe opposite. side of the warp by a marginal binding of sthexweft threads by e. g. 3 warp threads, the weft :thread is 'tensionedby a blow of the reed and inthe last phase woven inby the change of the shed, cut offby a cutting edge 23, Fig.5, whereupon the whole, process is repeated.

A modified embodiment of the device isshown in Figures '7 and 8.

The nozzle 3i showninFigure 7 comprises an air passage 32 and. -a.,central passage 33 .for .-the thread 34. Mounted for sliding movement in a bore 35 is a valve piston 35 adapted toclose the conduit 3'! for the supply ofcompressed'airinto the nozzle. The valvetfiis biassed by-a spring 38 into closed position. Atthe outer end of the valve stem a collar. 39 is rigidlysecureoh said collar beingengaged by a lever to. journalled on a pivot 4| in the casting 42 of the .nozzle. The lever- 40-carries a follower 43 arranged-forecoperation with a cam M. journalled on a pivot-45. The cam is'provided with a projection 46.

Mounted for rotation on top of the casing are two retracting rollers 41 and'48 driven in synchronism with the .drive of the .cam' M by any suitable means, not shown, for instance by-bevel gearing, in thedirection of arrows M. Arelieving recess l9v is provided in one or in both, of the, rollers, in the example shown in the roller 41 andpreferably at least one of the retracting rollers .is yieldingly mounted.

As shown in Fig. 7 the arrangement issuch that the thread 34 passes in a straight line from the supplying device (winding-off apparatus) throughthe

rollers

41, 48 into the passage-33 of the nozzle 3i.

The device described above operates-as follows:

Shortly before the beginning of the'picking operation the relieving recess 4% in-the-rollerfl assumes approximately .the position shownin Fig. 8 in which. it relieves the thread 34 from thread is seeuredby a gauze-like,- crossingimthe marginal portion of the fabric, for instance in the width of 3 or more warp threads at the end which is remote from the nozzle. At this time the

rollers

41 and 48 have already rotated to such an extent from the position shown in Figure 8 that the full circumferential portion of the roller 41 engages the thread 34 and exerts now a pulling action thereon in the direction of the arrow P in Figure 8, tensioning thus the thread. Hereupon the reed imparts a blow to the weft thread, the shed is changed and the weft thread woven in. A cutting edge or a shearing mechanism arranged near the margin of the fabric cuts off the thread, which is now retracted backwards in the direction of the arrow P by

rollers

41, 48 so that the free end of the thread, hanging down from the discharge orifice of the nozzle 3| is retracted back into the nozzle.

The winding-off apparatus for preparing the weft thread may also b modified and examples of such modified arrangements will now be described.

Figures 9 to 11 show one such modification.

The device comprises a winding-off drum which is preferably slightly conical, as illustrated in the drawing. The drum 5| is rigidly secured to a shaft 52 which receives movement from any desired driving mechanism, not illustrated, for instance through a gearing from the main shaft of the machine. The shaft 52 is supported in bearings 53, 54, mounted in a rigid sleeve 55 in the frame of the machine. On the sleeve 55 in the interior of the drum 5| a gear 58 is rigidly keyed on, said gear being a so-called sun-gear of a planet differential gearing which will be described later. A carrier 59 is secured to the bottom of the drum 5|, said carrier mounting for instance on a pivot 66 a planet gear 6| meshing with the sun-gear 58. The gear 6| is in engagement with a driven gear 62 which is rigidly secured to a disc 63 which in the following description will be called casting-off disc. From the embodiment as illustrated it is apparent that upon rotation of the shaft 52 through one revolution, the drum 5|, which is rigidly secured to this shaft will carry out also one revolution, whereas the casting-off disc 63 will at the same time carry out two revolutions in the same direction of rotation by the intermediary of the planet gearing.

The circumference of the drum 5| is provided with a shallow groove 64 which serves for mounting a guide 51 for the thread and further there are two thread entraining dogs having the form of projections 65 (see also Figure which are positioned diametrically opposite each other. Th disc 63 is provided with one extension 66 which in the following description will be called casting off member. This extension 66 is slightly higher than the projection 65 on the drum 5!.

On the carrier 61, which is mounted for rocking movement around the axi of the shaft 52 and is adjustable in any desired position for instance by a screw 56 on the sleeve 55, a braking wheel 69 is mounted for free rotation on a pivot 68. In the embodiment shown the wheel 69 is provided with a ring gear 10 engaging a ring gear 7| the ratio of diameters of the rings being such that upon one revolution of the drum 5| the braking wheel will carry out two revolutions. The braking wheel has a flange 12 of such a formation that between the wheel 69 and the surface of th drum 5| a gap 13 is left for the receiving of the thread 14 supplied from any suitable storage source for, instance from a bobbin or the like.

On one point of its circumference the braking wheel is provided with a braking member for instance in the shape of a projection 15 (see Fig. 10). This projection is arranged in such a way that when it is opposite the surface of the drum 5| it presses the thread 14 against the circumference thereof firmly clamping or braking the thread.

From the foregoing it is obvious that the braking wheel 69 revolves with the same velocity as the disc 63, i. e. twice as fast as the drum 5|.

The device operates as follows:

The thread supplied from the bobbin passes through the gap I3 along the circumference of the drum 5|, to point 16 (see Figure 11) where it is introduced into a taking-off mechanism, for instance a feeding device of a mehanical or pneumatic loom or the like. This position A of the thread is shown in Figure 11 with a broken line. Upon rotation of the drum 5| the dog 65 engages the thread 14 and carries it along. A loop is thus formed on the thread, marked with B in Figure 11. In the meantime, however, the casting oif extension 66 on the disc 63 catches up with the projection 65, since it travels with double its velocity, until finally in the required moment it overtakes the projection 65 and in consequence of its greater height, or possibly of its suitably shaped ramp, it casts off the thread 14 from the projection 65 i. e. disengages the thread from the projection. At the same time, however, the braking projection 15 on the braking wheel 59 has been positioned against the drum 5| and has clamped the thread, so that the feeding mechanism 16 can now feed such a length of thread only as has been pulled in this way into the loop B. The thread in the moment of feeding is shown in Figure 11 by a chain line C.

The device measures in this way a predetermined length of thread with a high degree of accuracy since the moment of casting oil the thread from the projection 65 may be exactly controlled.

In the example as described and illustrated the drum is provided with two projections 65 and the disc 63 with a single extension 66. It is evident, of course, that any other number of such projections may be arranged, for instance three or four projections 65 on the drum and one orv two extensions 66 on the disc 63. In this case the ratio or rotation of the casting-off disc to the velocity of the winding-off drum has to be selected in accordance with the proportion of the number of dogs 65 on the winding-off drum to the number of casting-off members 66 on the disc.

The same applies to the braking wheel 69 which may be provided also with the plurality of braking extensions 15; in such a case the velocity of the braking wheel has to be suitably adjusted.

Figures 12 and 13 illustrate other modified embodiments of the winding-off mechanism.

According to Figure 12 the winding-oil drum 5| and the braking wheel 69 are arranged in a similar way as in the embodiment according to Figures 9 to 11. The casting-off member, however, consists in this case of a stationary ramp 18 which in the illustrated example is rigidly secured, for instance to a sleeve 79 on which it may be adjusted in any conventional manner, for instance by a screw 66. The operation of this embodiment will be apparent from the preceding explanation. The projection 65, entraining the thread 14 carries the thread to the ramp 18, along which the thread is shifted radially in the direcaoespoo tion: from. the axis of :rotation: .of :the drum 5! until it-is castofi fromengagement withE-the projection 65.

Because the stationary ramp maybe objectionable for certain kindsof threads the device-may bearranged'ina way shown in Figure 13:.

Alsoin. this case the drum 5i andsthe bra-king wheel 69 are arranged similar as in the example according to Figure -9, but .the .lcastingeoftimember consists of a-:1ever -86; journalled 'ion a stationartyraxis 8|; The lever .isbiassed by .aspring 82 in counter-clockwise .direction.into inoperative positioniand is provided with-a rampBS cooperating with'projectionsfi l. on the drum-"5L1 :Upon movement of the drum 5! the thread. l4

--is' entrained. by :the projection and as soon 'as itereachesma .positionaoppositethe end. surface of. the. lever- 86,-". the. projection .84 cabuts. against the ramp'l83 .rockingthe lever 861 in clockwise direction; the thread is :thus, lifted-abovepthe. projectionyBS; andsoreleased; In. consequence of the ratio :ofz:distancesfromwthe axis of rotation 1.8I tolithe extension .84 .andzfrom the =.axis of rotation .81 to :the endasurfaceof the-lever '88 the said end surface ofgthe-.lev.er;moyes. with-a: "higher velocity than; the =.circ,umfer,ence .of. the

dhu'mfii, so thatialso in thiscasean overtaking movement. iae. ,a.smooth-diseng gement of, the

thread: from. the projection: 55 takes. place.-

,A further modificationzis shown, in .;Fi ure 1.4.-

lnqthisleasea pairof grooved discs-N182 ,are mounted at a-suitable distance. and provided'by a requisite numberef. ropes R preferably of round cross-section of any desired ma r als ne. :dis

9.1 of. thi :pair. 11S; driven. .at a requisite. veloc ty fr m a y desired. dr.irving mechanism or receiv drivelrrompa pu11ey'93 from-.a-ny-shaft ofi he main machine. The driven-disc 9 I- is provided :with a conical ext ion 94 al n the cir umference of which the e r lls a pre sure z'winding '3 01 e the position of the. l t r can be a justed to an desired radius of V the con ica-l extension -94 for the purpose of adjusting the winding-oijfiyelocity and in this-waythe length of the supplied piece of thread The device operates as follows:

The threadefrom .the storage bobbin 90 is inserted underneath the pressure winding oller .95 on the conical extension and is then alternately interlaced between the ropes-.Rdhy'whiGh the pair ofgrooved discs. 9t, 92 ,is surrounded, whereupon. in the places? it is introduced into .asmachine, not shown, to which it. supplies pieces of .threads. The device-is :thus preparedior operation. Afterthe machine together -with. the

feeder has been set in operation the threadds wound-on by the roller 95, entrained between-the ropes and forms ,a loose loop ,-for .such a length -.of time until its end which is gripped by any desired feeding mechanism oithe proper machine, ,such as by the pickingelement of ameehanical loom .or by a nozzle-of a pneumatic loom, is, together with the wound off loopof anadjusted length, pulled for instance into'the shed on the said loom-under simultaneous braking. and cutting-off operation, whereupon ;-the procedure is repeated.

ure 15. shows'the overall arrangement of the loom provided with a deviceaccording to the invention. The loom marked ;with .th e general reference-numeral may comprise the usual warp operatingmechanisms which are. well known and :need ot-be. described in detail-1;. At one, or .at ,both sides of the loom the-nozzle mechanism marked nerally I 26 is ,moiinted. In front of the nozzle the winding-off apparatus -l 21- is arranged, preparing the predetermined length of the thread, markedhere I28; supplied by a bobbin I29 for. picking .by-the nozzle. Compressed air is supplied by a conduit I36 .over a throttling valve 53! into a storage chamber 132 and. from here through a tube! 33 into the nozzle.

It is an important feature of the invention to provide the storage chamber 132 ior compressed air, as in this way exactly measured batchesof air. can besupplied to the nozzle; only in this way uniform results -may be obtained; For this reason it is also important ,to be able to changethe volume of this storage chamber. To this end it. is possible to use either rseveral :interchangeable chambers of different volumenorzto'arrange a substantially cylindrical. storage. chambers: provided with an adjustable piston 1.34.. "By changing pfrthe position, of -thi;s:.;piston :the wollime of the s or e chamhercan beareadily" changed-in theze rre pondence .ewiththe prevailing .conditions. Furthermore, in consequence of .thisbanrangement the entraihihg efiect; of, thesairxjet is maximum: a t be nning of r the. blowing op t on; whereu en'i gradually sinks eupon the drop of. pre ure in the .ehamber I li Theysfullpressureiinpact of the compressedair is';-impar.ted-;to the leadin -port on orthethread :onhr, whereas the subsequent portions of: the thread raressuh- ,rieetedito afar smallerinfluence ofthe an get. In

this way a correct picking-operation is-assured. 1-1 pm the {other hand. the vair pressurewould :remain constant or substantially -eonsta;nt throughout. the -full "period of picking operation: the thread would .beliableto b come entan led a the, rear portions thereoi,: which would behemojectedzto the ,dIiV IIgyfOII ofrthezair 31613; f, :a onger -,t me W0 1dbe c 1 rated-m re han :the leadin p tion and-mig t asi y overtaket e'latter during their flight. tllire l -kl. the :Shed; this Wou1d,,r u1.t inthe weft thre :be emins entangled:

It of. cour pos ible. instead ofas-ins nozzl to ..arrange whole system :of' nozzles. exit t .e ehother. or inacommon body -by whioh diffierent; o ..diii r nt v o ure weft thr adam v picked..- According toqrequirements. a substitutionlor. change .ofzawei t thread by anotherthread maybe cfiected inany momentby amere shifting of the common body.

In, addition ,.to..the abovernentioned ibafc tadvanta esthe invention is ,iurther dvant geous inter alia .by. the, factthtitit makes possible th w av n -inst. even very "thin.v Wefts and als of wefts .of any desired thickness and on little strength ,as. well as. wefts of .,a slight twister-even withoutthe Sam becauselthere are.-r1ev such i orou requirements placedon. he 1 quality Q th W -asinweavingpn-a u 1el0 m- While I have disclosed. the principles -of' my invention. in ,conne ction.- with several, embodi- ,rnents .it willqbe understood. .that these embodiments. re givenby way. -0f.. x mp1e..0n1v and-not as,1imiting.the,scope of the inv.ention,as.se t.;orth in the appended claims...

Inlaim:

1. A ,devicejor .weavingiof fabrics-comprising in combination means, for operating 1 the .tweft threads, a. .nozzle forlthe. production .of. an .7 .air jet; p ed .to entrainthe .Weft threadinto the shed o p th ads, a wind n -off. drumfor the weftthread, at least-one thread-pntrainingdog on--the winding-off drum, acastin off member adapted-to release the thread from,.engagement with? .the said dog, a braking -member adapted .to-cooperate iwith the winding-01f drum and with the weft thread passing between the said braking member and the winding-01f drum and adapted to brake the thread in the moment of its release from engagement with the dog.

2. A device for weaving of fabrics comprising in combination means for operating the weft threads, a nozzle for the production of an air jet, adapted to entrain the weft thread into the shed of warp threads, 2. winding-oil drum for the weft thread, at least one thread-entraining dog on the winding-E drum, a casting off member, adapted to release the thread from engagement with th said dog, a braking wheel cooperating with the winding-off drum, a gap between the circumference of the braking wheel and the winding-off drum for free passage of the thread, a braking extension on at least one point of the circumference of the braking wheel, said braking extension being adapted to close the gap and clamp the thread.

3. A device for weaving of fabrics comprising in combination means for operating the weft, a nozzle for the production of an air jet adapted to entrain the weft thread into the shed, a rotatable winding-off drum for the weft thread, at least one thread-entraining dog on the windingofi drum, a casting off disc mounted for rotation in close proximity of the winding-off drum, a casting off member provided on the casting off disc, means for rotating the casting off disc at a higher velocity than the winding-off drum, the ratio of velocity of the casting-off disc to the velocity of the winding-01f drum being equal to the proportion of the number of dogs on the winding-ofl drum to the number of casting-off members on the disc.

4. A device as claimed in claim 1 wherein the winding-off drum is provided with a groove for the thread.

5. A device as claimed in claim 1 wherein the winding-on drum is provided with a groove for the thread and with a guide mounted in the said groove.

6. A device for weaving of fabrics comprising in combination means for operating the weft, a nozzle for the production of an air jet adapted to entrain the weft thread into the shed, a rotatable winding-off drum for the weft thread. at least one thread-entraining do on the winding-ofi drum, a casting-off disc, mounted for rotation in close proximity of the winding-01f drum, a casting 011 member provided on the casting off disc, a planet gearing adapted to impart rotation to the winding-01f drum and rotation at higher velocity to the casting-off disc, a braking wheel mounted for cooperation with the winding-off drum, a gearing on the circumference of the winding-off drum, a gearin on the braking wheel meshing with the said gearing on the windingoif drum.

VLADIMJ IR SVATY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,368,691 Brooks Feb. 15, 1921 2,005,391 Pool June 18, 1935 2,501,982 Zerbee Mar. 28, 1950 2,519,786 Paabo Aug. 22,