Patente de Telar de Lanzaderas Positiva

8/12/2019 Patente de Telar de Lanzaderas Positiva

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JE u r o p a , s c h e s P _ MM M II II INI Mil IN Ml Ml MlEuropean Patent Office . . . _ .* . . , Publication number: 0 3 6 3 0 1 6 B 1Office europeen des brevets

EUROPEAN PATENT S P E C I F I C A T I O N Date of publication of patent specification: 17.05.95 Int. CI.6: D03D 29/00, D03D 47/12 Application number: 89309042.3@ Date of filing: 06.09.89

Hand loom.

Priority: 07.09.88 GB 8820952 Proprietor: Griffith Textile Machines Limited9 Walton Road@ Date of publication of application: District 1511.04.90 Bulletin 90/15 Pattinson North Industrial EstateWashington Publication of the grant of the patent: Sunderland17.05.95 Bulletin 95/20 Tyne &Wear NE38 8QA (GB)

Designated Contracting States: @ Inventor: Griffith, John DaltonBE CH DE ES FR GB IT LI 16 Burdon RoadCleddon References cited: SunderlandAT-B- 368 200 Tyne &Wear SR6 7RU (GB)CH-A- 577 575DE-B- 161 060 Representative: Dealtry, Brian et alINDUSTRIE TEXTILE, no. 1101, June 1980, Eric Potter &Clarksonpages 539-540, Paris, FR; J. PILISI: Le tis- St. Mary's Courtsage a bras contemporain St. Mary's GateNottingham NG1 1LE (GB)

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CO00 Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of oppositionCL shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition feeLU has been paid (Art. 99(1) European patent convention).Rank Xerox (UK) Business Services(3. 10/3.09/3.3.3)


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DescriptionThe present invention relates to weavinglooms.In particular the invention relates to a weavingloom which is compact, light in weight and which iscapable of being programmed to produce a varietyof patterns by suitable choice of weft yarn selectionand/or warp shed sequences.Weaving looms with rapiers are well known andthe majority have two flexible rapiers which meet inthe centre and transfer the weft from one to theother. By transferring the weft in the centre, theends of the rapiers have to be positioned ac-curately and, in this respect, it is usual for therapiers to be guided by guide members whichhave to enter the warp shed. These guides causeproblems in that they add to the machine complex-ity, can mark some warp yarns, and can wear therapiers. A known loom of this type is described inCH-A-577 575.It is an object of this invention to provide animproved weaving loom.According to one aspect of this invention, thereis provided a weaving loom comprising a reed, aflexible rapier capable of reciprocating movementthrough a warp shed between a first position at oneside of the warp shed and a second position at theopposite side of the warp shed, said rapier havinga rapier head adapted to grip a weft yarn when therapier is at the first position, to draw the weft yarn

through the warp shed and to release the weft yarnwhen the rapier is at the second position, whereinthe reed is adapted to define a tunnel with the warpshed such that said rapier can be guided entirelyby the tunnel as the rapier moves between saidfirst and second positions.According to another aspect of this inventionthere is provided a weaving loom including a reedmounted on an oscillatable reed shaft, and a rapierfor drawing weft yarn through a warp shed, therapier having a rapier head mounted on the end ofan elongate drive member which is capable ofreciprocating the head through the warp shed,drive means for oscillating the reed shaft such thatduring said insertion and retraction strokes the reedis spaced from the fell to enable unhindered travelof the rapier head and such that the reed is ad-vanced to urge the rapier toward the fell when therapier is at its fuly inserted position such that therapier head is positively located for co-operationwith weft yarn guide means for collection of weftyarn.A weaving loom according to the invention hasthe advantage that it enables the rapier to movethrough the warp unrestrained by any guide mem-ber projecting through the warp. A rapier loom witha single rapier does not have to be positioned

acurately in the warp shed; it merely has to passthrough the shed. Consequently the provision ofguides which project into the warp shed is notrequired.5 In a particular embodiment of the invention, theweaving loom is a single rapier weaving loom.The weaving loom is particularly suited for be-ing manually driven and able to weave fabrics upto about one metre in width.io The invention is claimed in claim 1, with furtherpreferred embodiments being claimed in claims 2-15. Various aspects of the present are hereinafterdescribed with reference to the accompanying75 drawings, in which:-Figure 1 is a schematic perspective view of aloom according to the present invention as view-ed from one end and the front;Figure 2 is a view similar to Figure 1 showing20 part of the loom as viewed from the oppositeend and the rear;Figure 3 is a more detailed schematic perspec-tive view showing emergence of the rapier fromthe warp shed to collect weft yarn; and25 Figure 4 is a schematic front view showingemergence of the rapier from the warp shed atthe rapier insertion side of the loom.The loom 10 according to the present inventionincludes a frame having a pair of end walls 14, 1630 spaced apart and secured to one another by cross-members 18, 19 located at the front of the loomand cross-members 20, 22 located toward the rearof the loom.It will be appreciated that if needed, additional35 cross-members may be provided. The end walls14, 16 are preferably made from a metal sheet.The loom 10 includes a main drive shaft 25which is rotatably mounted in the end walls 14, 16.The drive shaft 25 extends beyond end wall 14 and40 has a sprocket 25a mounted thereon. The Sprocket25a drives a plurality of cams 26 via a chain 27.The cams 26 operate levers 26a for raising andlowering the heald frames 30 in a conventionalmanner via cables 30a. The opposite end of the

45 main drive shaft 25 projects beyond the end wall16 and has a flywheel 28 mounted thereon (seeFigure 2.)A reed shaft 40 is rotatably mounted at op-posite ends in end walls 14, 16. The reed shaft 4050 projects beyond end wall 14 and has a crank arm46 mounted thereon. The crank arm 46 has a pairof pawls 47, 48 extending therefrom, pawl 47 beingarranged to drive a weft yarn selection mechanism50 and pawl 48 being arranged to index a toothed55 disc 53.The loom includes a fabric tension take downroller 52 which has a toothed pulley 52a fixedthereto. A toothed belt 54 is trailed about the pulley

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of the toothed disc 53 and pulley 52a so thatindexing of disc 53 causes an indexing movementof the take down roller 52.Woven fabric W extends from the fabric ten-sion take down roller 52 over a guide shaft 58 to bewrapped onto a take-off roller 59. The roller 59 islocated at either end in a cradle 59a formed on theside of respective end walls 14, 16 and is sup-ported at each end by a belt 60 which is trainedabout roller 52.The opposite end of the reed shaft 40 projectsbeyond each wall 16 and has bolted thereto asupport bar 60 which extends longitudinally fromthe shaft 40. The support bar 60 has an arm 61projecting laterally therefrom and is connected viaa push rod 62 to a lever 63. The lever 63 extendsfrom a shaft 64 which is rotatably mounted in aframe 65 secured to end wall 16. A bell crank 67 issecured to the shaft 64 and one arm 67a of the bellcrank is connected via a push rod 69 to theflywheel 28.Accordingly rotation of the flywheel 28 causesthe shaft 64 to oscillate backwards and forwardsdue to the connection between push rod 69 andarm 67a.Such oscillation of shaft 64 causes the reedshaft 40 to oscillate as determined by the lever 63and push rod 62.Lever 63 and push rod 62 can be set so thatthe reed moves rapidly from the front to the rear,and then moves forward and back a small amountfrom the rear before returning to the front.This results in a dwell of the reed at its rearposition and a movement to help support the rapierwhen it is through the shed and picking up a weftthread.Figure 5 shows how this is done. The pivot 80at the end of lever 63, moves from a position 80,past 80a to 80b. This causes the arm 61 to movefrom position 61 (reed at front) to 61a (reed at rear)and then to 61b (reed moved slightly forwardagain) before returning via the same route.Also mounted on the support bar 60 is a rapierdrive mechanism 70 which drives a rapier 72 (Fig-

ure 3) across the warp sheet.The rapier 72 is connected to the end of aflexible drive strip 73, formed for instance from asuitable plastics material, which includes a seriesof regularly spaced apertures 74. The drive strip 73is trained about a toothed drive wheel 76 which hasregularly spaced projections 78 formed on its pe-riphery for engagement in the regularly spacedapertures 74 of the drive strip.A toothed drive belt 80 is trained about a drivepulley 82 attached to the drive wheel 76 and anidler pulley 83 rotatably mounted on the supportbar 60.

A clamp head 86 is secured to the lower run ofthe drive belt 80 and is connected via a push rod88 to the other arm 67b of the bell crank 67.Accordingly as the shaft 64 oscillates the rapier5 drive mechanism 70 is driven simultaneously withoscillation of the reed shaft 40. Since the rapierdrive strip 73 is driven via a toothed wheel 76which is itself driven by a toothed drive belt 80 themovement of the rapier 72 is synchronised withio movement of the reed shaft 40.The reed 90 is attached to a reed support plate91 which extends along the reed shaft 40. A guidechannel 93 is secured at one end to the reedsupport plate 91 and is attached at its other end tois a support plate 94 at a location adjacent to thetoothed drive wheel 76. The guide channel 93provides support and guidance for the drive strip73 between the drive wheel 76 and its entry intothe shed. A support sleeve 96 is secured to the20 support plate 94 and to a drive strip support plate97 which is secured to the reed shaft 40. Thesupport plate 97 includes a flange 98 on which ismounted a guide channel 99 for guiding movementof the drive strip 73.25 The movement of the reed shaft 40 is arrangedso as to provide as much clearance as possibleduring insertion and retraction of the rapier 72.Accordingly for the majority of the duration ofmovement of the rapier 72 the reed 90 is located at30 a rearward position.In order to ensure that the rapier 72 is ac-curately positioned to pick up weft yarn as itemerges from the shed the reed 90 is advanced toan intermediate forward position whereat it urges35 the rapier drive strip 73 against the fell.This situation is schemcatically illustrated inFigure 3.The weft yarn 100 from the previous pick ex-tends from the weave through a weft yarn guide40 eye 101. A combined guide and knife device 103 isprovided which is movable between a lower posi-tion and a raised position. The guide and knifedevice 103 includes an angled support plate 106having a substantially vertical arm 106a to which a

45 knife blade 107 is attached. The plate 106 has asubstantially horizontal arm 106b which is hingedlyattached to part of the loom from LF. The supportplate 106 has an upper edge 108 which engagesthe weft yarn 100 as it is moved to its upper50 position. Such movement causes the weft yarn 100to wrap about the underside of the rapier 72 so thatwhen the rapier 72 begins to retract the weft yarn100 is trapped between the spring wire 110 and thebody of the rapier 72. Raising and lowering of the55 support plate 106 is effected by a push rod 150which is operated upon by a cam (not shown)mounted on the main drive shaft.

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As the rapier 72 begins to retract further theweft yarn 100 between the rapier and the weave ispulled taught across the knife blade 107 and is cutthereby. In addition as the rapier 72 begins toretract the reed 90 is also retracted toward itsrearward position.When the rapier 72 is near to emergence fromthe rapier insertion side of the weave, the reed 90beings to advance. As the rapier 72 emerges theupper portion of the spring wire 110 engages acam block 120 mounted on the reed 90 whichcauses the lower portion of the spring wire to moveaway from the body of the rapier and therebyrelease the weft yarn. As the rapier 72 continues toretract the reed 90 advances to beat-up.A pair of cutters 130 are provided for trimmingthe edges of the weave. The cutters 130 are moun-ted on a fabric guide bar 132 and include a staticblade 133 and a movable blade 134 which isbiased to an open position and closed by a roller135 being engaged by the reed 90 when it ismoved to its beat-up position.The weft yarn selection mechanism 50 prefer-ably comprises a series of laterally spaced rods200 inter-connected to form a continuous belt. Thebelt is supported on a roller 202. The pawl 47 isarranged to successively engage each rod 200 sothat during each weaving cycle the belt is ad-vanced by one rod spacing. Each rod 200 carries acam wheel 205 which, dependent upon its axialposition along its associated rod engages with aweft yarn guide arm 210 (only one of which isshown for clarity). When a guide arm 210 is en-gaged by a cam wheel 205 it is raised to an upperfeed position whereat it presents weft yarn to therapier 70. When not engaged by a cam wheel 205each guide arm 210 is located at a lower stowedposition whereat weft yarn guided thereby is notpresented to the rapier 70.Programming of weft selection is simplyachieved by sliding each cam wheel 205 to anappropriate axial position along its associated rod200. The pattern repeat is determined by the num-ber of rods 200 making up the belt and this maybe changed as desired.The main drive shaft 25 is rotatably driven inthe embodiment illustrated by means of a manuallyoperated drive means 180 in the form of a continu-ous chain 181 entrained about a sprocket wheel182 mounted on the drive shaft 25 and a drivesprocket wheel 183 rotatably mounted on a frame185. The drive sprocket wheel 183 is rotated bymeans of a pedal crank assembly 175. The frame185 preferably extends upwardly to support a seat(not shown) for an operative.It will be appreciated that a motorised drivemeans may be incorporated for rotating the maindrive shaft 25.

Claims1. A weaving loom comprising a reed (90) moun-ted on a reed shaft (40), a flexible rapier (72)5 which reciprocatively undergoes insertion andretraction strokes through a warp shed, saidrapier having a rapier head for gripping a weft

yarn (100) and for drawing the weft yarnthrough the warp shed and drive meansw (28,61-64,67,69) drivingly connected to thereed shaft (40) to oscillate the reed simulta-neously with insertion and retraction strokes ofthe rapier (72), characterised in that the drivemeans during the insertion stroke of the rapieris (72) moves the reed (90) from a front beatupposition to a fully retracted position (61a) andthen advances to an intermediate front position(61b) when the rapier (72) at its fully insertedposition to urge the rapier towards the fell, and20 that during the retraction stroke of the rapier(72) the drive means moves the reed from theintermediate front position (61b) to the fullyretracted position (61a) and then from the fullyretracted position to the front beat-up position.25 2. A weaving loom according to claim 1, whereinthe drive means includes a drive lever (63)mounted on a drive shaft (64) which undergoesoscillatory rotation, an arm (61) projecting from30 the reed shaft and a push rod (62) drivinglyconnecting the arm and the drive lever so thatoscillatory rotation of the shaft causes saidmovement of the reed shaft.

35 3. A weaving loom according to claim 2, whereinthe rapier head is mounted on a flexible stripmember (73).4. A weaving loom according to claim 3, wherein40 the flexible strip member (73) is drawn longitu-dinally by a drive wheel (76) mounted on thereed shaft at a location axially spaced from thereed, a first guide member (93) mounted onthe reed shaft being provided for guiding the

45 flexible strip between the drive wheel and thereed.5. A weaving loom according to claim 4, whereinthe flexible strip member (73) is guided be-50 neath the warp sheet by a second guide mem-ber (99) mounted on said reed shaft.6. A weaving loom according to claim 4 or 5,wherein the drive wheel and reed shaft are55 driven in synchronism by a common drivetransmission (28,61-64,67,69).

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5. Webstuhl nach Anspruch 4, wobei das flexibleBandelement (73) durch ein am Blattschaftmontiertes zweites Fuhrungselement (99) unterdem Kettfach gefuhrt ist.6. Webstuhl nach Anspruch 4 oder 5, wobei dasAntriebsrad und der Blattschaft durch eine ge-meinsame Antriebsubertragung (28, 61 - 64,67, 69) synchron miteinander angetrieben wer-den.7. Webstuhl nach Anspruch 6, wobei die gemein-same Antriebsubertragung einen Winkelhebel(67) mit einem Arm (67a), der mit einer rotie-renden Hauptantriebswelle (25) verbunden ist,urn durch diese in Schwingung versetzt zuwerden, aufweist, der andere Arm (67b) desWinkelhebels antriebsmaBig mit dem Antriebs-rad verbunden ist, urn dessen schwingendeDrehung herbeizufuhren, (und) der Winkelhe-bel an der Antriebswelle (64) montiert ist, urnderen schwingende Drehung herbeizufuhren.8. Webstuhl nach einem der vorangehenden An-spruche, wobei der Rapierkopf einen Rapier-korper aufweist, der eine Schlaufe aus Feder-draht (110) zum Verklingen (latching) vonSchuBfaden tragt, (und) die SchuBfadenfuh-rungseinrichtung (101) wirksam ist, urn denSchuBfaden vor dem Zuruckziehen des Ra-piers urn den Rapierkorper zu drangen undsein Einziehen in das Fach zu veranlassen.9. Webstuhl nach Anspruch 8, wobei ein(e)SchloB oder Kurve (120) in der Bahn des Ra-piers am Blatt montiert ist, urn an der Schlaufeaus Federdraht anzugreifen und das Freigebendes SchuBfadens wahrend des Zuruckzieh-hubs des Rapiers zu veranlassen.10. Webstuhl nach einem der vorangehenden An-spruche, umfassend eine sich in der Richtungdes SchuB(faden)einzugs uber die Breite desWebstuhls erstreckende Hauptantriebswelle

(25), die am einen Ende ein in Antriebsverbin-dung mit dem Blattschaft stehendes Schwun-grad (28) aufweist.11. Webstuhl nach Anspruch 10, wobei der Web-stuhl eine Anzahl von Litzenrahmen (30) auf-weist und die Hauptantriebswelle (25) ubereine Musterwahleinrichtung (26) antriebsmaBigmit den Litzenrahmen verbunden ist.12. Webstuhl nach Anspruch 11, wobei die Mu-sterwahleinrichtung (26) eine Anzahl von Kur-ven oder Nocken (26) aufweist, die eine Anzahl

von zum Heben und Senken der Litzenrahmen

(30) angeordneten Hebeln (26a) betatigen, wel-che Kurven oder Nocken durch die Hauptan-triebswelle fur Drehung angetrieben werden.5 13. Webstuhl nach einem der Anspruche 10 bis12, wobei manuell betatigte Antriebsmittel(180) zum Drehen der Hauptantriebswelle vor-gesehen sind.70 14. Webstuhl nach einem der vorangehenden An-spruche, wobei keine in das Kettfach vorste-henden oder hineinragenden Fuhrungsmittelzum Fuhren des Rapiers wahrend seiner Ein-fuhr- und Zuruckziehhube vorgesehen sind.75 15. Webstuhl nach einem der vorangehenden An-spruche, wobei das Blatt mit dem Kettfacheinen Tunnel festzulegen vermag, so daB dasRapier wahrend der Ausfuhrung seiner Einfuhr-20 und Zuruckziehhube vollstandig durch denTunnel gefuhrt werden kann.

Revendicatlons25 1. Metier a tisser comprenant un peigne (90)monte sur un arbre de peigne (40), une rapiereflexible (72) qui est soumise a des coursesd'insertion et de retraction dans un sens etdans I'autre, par I'intermediaire d'une foule de30 chaTne, ladite rapiere ayant une tete de rapiere

pour saisir un fil de trame (100) et pour extrai-re le fil de trame de la foule de chaTne et desmoyens d'entraTnement (28, 61 a 64, 67, 69)connectes en entraTnement a I'arbre de peigne35 (40), pour faire osciller le peigne simultane-ment aux courses d'insertion et de retractionde la rapiere (72), caracterise en ce que lemoyen d'entraTnement, durant la course d'in-sertion de la rapiere (72), deplace le peigne40 (90), depuis une position avant de battage,vers une position completement retractee(61a), et avance ensuite vers une positionavant (61b) intermediaire, lorsque la rapiere(72) se trouve dans sa position completement

45 inseree, en vue de pousser la rapiere vers lafagure, et en ce que, durant la course deretraction de la rapiere (72), le moyen d'entraT-nement deplace le peigne depuis la positionavant (61b) intermediaire vers la position com-50 pletement retractee (61a) et ensuite de la posi-tion completement retractee a la position avantde battage.2. Metier a tisser selon la revendication 1, dans55 lequel le moyen d'entraTnement comprend unlevier d'entraTnement (63) monte sur un arbred'entraTnement (64) qui subit une rotation oscil-

latoire, un bras (61) faisant saillie de I'arbre de6


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peigne et une tige de poussee (62) reliant parentraTnement le bras et le levier d'entraTne-ment, de maniere qu'une rotation oscillatoirede I'arbre provoque ledit mouvement de I'arbre 10.de peigne. 5

3. Metier a tisser selon la revendication 2, danslequel la tete de rapiere est montee sur unorgane formant bande (73) flexible. 104. Metier a tisser selon la revendication 3, danslequel I'organe formant bande (73) flexible est 11.tire longitudinalement par une roue d'entraTne-ment (76) montee sur I'arbre de peigne, en unemplacement espace axialement du peigne, un ispremier organe de guidage (93) monte surI'arbre de peigne, etant prevu pour guider labande flexible entre la roue d'entraTnement etle peigne. 20 12.5. Metier a tisser selon la revendication 4, danslequel I'organe formant bande flexible (73) estguide au-dessous de la feuille de chaTne parun deuxieme organe de guidage (99) montesur ledit arbre de peigne. 25

6. Metier a tisser selon la revendication 4 ou 5,dans lequel la roue d'entraTnement et I'arbre 13.de peigne sont entraTnes en synchronisme parune transmission d'entraTnement (28, 61 a 64, 3067, 69) commune.7. Metier a tisser selon la revendication 6, danslequel la transmission d'entraTnement commu- 14.ne comprend une genouillere (67) ayant un 35bras (67a) connecte a un arbre d'entraTnement(25) principal rotatif, de maniere a etre mise enoscillation, I'autre bras (67b) de la genouillereetant relie en entraTnement a ladite roue d'en-traTnement pour provoquer sa rotation oscilla- 40 15.toire, la genouillere etant montee sur ledit ar-bre d'entraTnement (64) pour provoquer sa ro-tation oscillatoire.

8. Metier a tisser selon I'une quelconque des 45revendications precedentes, dans lequel la tetede rapiere comprend un corps de rapiere sup-portant une boucle de fil elastique (110) pourfermer le fil de trame, le moyen de guidage defil de trame (101) pouvant fonctionner pour 50pousser le fil de trame autour du corps derapiere, avant la retraction de la rapiere et pourle forcer a etre tire dans la foule.

15.

quer la liberation du fil de trame durant lacourse de retraction de la rapiere.Metier a tisser selon I'une quelconque desrevendications precedentes, comprenant un ar-bre d'entraTnement (25) principal, s'etendantdans la direction d'insertion de trame sur lalargeur du metier a tisser, I'arbre d'entraTne-ment ayant a une extremite un volant (28) enliaison d'entraTnement avec I'arbre de peigne.Metier a tisser selon la revendication 10, danslequel le metier a tisser comprend une plurali-te de cadres de lames de harnais (30) etI'arbre d'entraTnement (25) principal est en liai-son d'entraTnement avec les cadres de lamesde harnais via des moyens de selection demotifs (26).Metier a tisser selon la revendication 11, danslequel le moyen de selection de motifs (26)comprend une pluralite de cames (26) qui ac-tionnent une pluralite de leviers (26a) agencespour lever et abaisser lesdits cadres de lamesde harnais (30), les cames etant entraTnees enrotation par I'arbre d'entraTnement principal.Metier a tisser selon I'une quelconque desrevendications 10 a 12, dans lequel desmoyens d'entraTnement (180) actionnes ma-nuellement sont prevus pour faire tourner I'ar-bre d'entraTnement principal.Metier a tisser selon I'une quelconque desrevendications precedentes, dans lequel aucunmoyen de guidage n'est prevu, faisant sailliedans la foule de chaTne, pour guider la rapieredurant ses courses d'insertion et de retraction.Metier a tisser selon I'une quelconque desrevendications precedentes, dans lequel le pei-gne est adapte pour definir un tunnel conjoin-tement avec la foule de chaTne, de maniereque ladite rapiere puisse etre guidee entiere-ment par le tunnel lorsque la rapiere est expo-see a ses courses d'insertion et de retraction.

9. Metier a tisser selon la revendication 8, danslequel une came (120) est montee sur le pei-gne dans le chemin de la rapiere servant aengager la boucle de fil elastique, pour provo-

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Patente de Telar de Lanzaderas Positiva