EP0007543B1 - Loom with weft cutting device and such a device for use therein - Google Patents

Loom with weft cutting device and such a device for use therein Download PDF

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Publication number
EP0007543B1
EP0007543B1 EP19790102460 EP79102460A EP0007543B1 EP 0007543 B1 EP0007543 B1 EP 0007543B1 EP 19790102460 EP19790102460 EP 19790102460 EP 79102460 A EP79102460 A EP 79102460A EP 0007543 B1 EP0007543 B1 EP 0007543B1
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EP
European Patent Office
Prior art keywords
weft
loom
support
shear
knife
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19790102460
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German (de)
French (fr)
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EP0007543A1 (en
Inventor
André Dewispelaere
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Cessione ferromatrix Nv
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"pvba Van De Wiele International"
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Priority claimed from BE189601A external-priority patent/BE869386A/en
Application filed by "pvba Van De Wiele International" filed Critical "pvba Van De Wiele International"
Publication of EP0007543A1 publication Critical patent/EP0007543A1/en
Application granted granted Critical
Publication of EP0007543B1 publication Critical patent/EP0007543B1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/70—Devices for cutting weft threads

Definitions

  • the invention relates to a weaving loom according to the preamble of claim 1.
  • weaving machines provided with a weft cutter device are known inter alia from documents US-A-4,077,438; DE-C-1,083,756; FR-A-2,277,916; FR-A-1.566.536 and DE-A-1.710.291.
  • the document FR-A-1.566.536 relates to a trade in which the cutting movement of the weft cutter device is obtained as the result of two movements: the movement of raising and lowering of the scissors themselves, controlled by a cam, and cutting by means of scissors by a sliding cam.
  • the object of the invention is to eliminate these drawbacks and to offer a weaving loom with a weft cutter device in which the loss of weft yarn on each pick is relatively low while the weft cutter device can however be maintained relatively simple construction.
  • the weaving loom according to the invention meets the conditions as defined in the characterizing part of claim 1.
  • the transmission by rod between the support of the cam follower and the chisel comprises at one end a connecting rod which is fixed, at a certain distance from the axis of articulation of the support, articulated around an axis parallel to this axis of articulation, on the aforementioned support.
  • the articulated or pivoting attachment of the rod to one end of the rod transmission on the support of the cam follower is formed by a shaft with respect to which at least one of the elements formed by the aforementioned rod and the support can rotate, shaft which can be moved in the longitudinal direction relative to at least one of the last aforementioned elements.
  • the rod transmission between the follower support and the weft chisel has at one end a rod which is positively connected to one of the knives of the weft chisel and which is therefore articulated about the axis of rotation about which the knives can pivot relative to each other, relative to the other knife.
  • the weft cutter device comprises a clamping part and means for applying the latter elastically against one of the knives.
  • the weft cutter also acts as a weft presentation device for the gripper, so that no auxiliary mechanism is required for this presentation.
  • the invention also relates to a weft cutter device intended for use in a weaving loom according to one of the preceding embodiments.
  • the weaving loom illustrated in the drawings is of a known type with pliers and bars with rigid pliers. For the sake of simplification, the loom will be described below and illustrated in the accompanying drawings only to the extent necessary to illustrate the invention.
  • the loom includes a drive shaft 1 which is supported in the frame 2 and is driven by a motor not shown in the drawings.
  • auxiliary shaft 3 which can be actuated by an alternating pivoting movement using a known transmission not illustrated in the drawings from the drive shaft 1, is mounted the rose lever 4, which carries at the upper part the leaf 5 and the ros 6. Opposite the latter are mounted two clamp bars 7, which each carry a clamp 8. These clamp bars 7 and clamps 8 are part of the weft introduction mechanism which introduces a weft thread into the crowd or interval of the warp.
  • the first clamp 8 grabs on one side of the loom, the weft thread which is unwound from a reel and transmits it, in the middle of the loom, to the other clamp 8 which pulls the thread even further through the crowd .
  • the ros lever 4, the leaf 5 and the ros 6 can be driven in a back-and-forth pivoting movement relative to a fabric table 9 mounted on the frame 2 and which supports the fabric already formed.
  • the weft cutter mechanism On the side of the loom from which the weft thread is brought into the crowd and where therefore, with each pick, the weft thread is driven by the first clamp, there is a weft cutter mechanism which, when the thread of weft has been completely pulled through the crowd, cut this weft thread so that the clamp, during the next pick, can again bring a free end of the weft thread through the next crowd.
  • the weft cutter mechanism consists of a weft chisel, generally designated by the reference 10, and by a transmission between this chisel and the drive shaft 1, a transmission which controls the opening and closing of the chisel to frame.
  • the weft scissor 10 comprises a fixed knife 11 which is fixed by two bolts 12 at a certain distance from a fixing piece 13. The latter is itself fixed by bolts 14 and nuts 15 to leaf 5, immediately next to ros 6. Between the fixed knife 11 and the fixing piece 13 is the movable knife 16, which is rotatably mounted relative to the fixing piece 13. On the side of the movable knife 16 opposite the stationary knife 11, pressure is exerted by a clamping piece 18 which partially penetrates into an opening 19 of the fixing piece 13. A spring 20 pushes this clamping piece out of the opening 19 , with his head against the knife 16.
  • the articulated fixing of the movable knife 16 on the fixing piece 13 is obtained by means of a lever 21 of the aforementioned transmission.
  • the knife 16 is positively secured by bolts 22 of one end of the lever 21, which end is articulated on a shaft 24 screwed firmly by one end into the fixed knife 11.
  • This shaft extends in the direction of the frame, so that the movable knife 16 can be moved in a vertical plane extending parallel to the warp threads.
  • a pressure spring 23 is arranged around the shaft 24, between a plate 17 fixed to the end of this shaft 24 and the movable knife 16, and it pushes the latter against the fixed knife 11. It is obvious that the bolts 12 must not hinder the movement of the knife 16 relative to the stationary knife 11, nor the corresponding tilting of the lever 21.
  • the end of the lever 21 remote from the weft chisel 10 is provided with a groove 25 extending in the longitudinal direction.
  • a shaft 26 which extends parallel to the shaft 24 and which connects the lever 21 to a second connecting rod 27.
  • the latter consists of three parts which can be screwed into one another, which allows you to adjust the length of the connecting rod.
  • the lever 21 and the connecting rod 27 form a rod transmission between the movable knife 16 and the support 28 of a cam follower 29.
  • the latter is a wheel which circulates on a cam disc 30.
  • the latter is fixed against a wheel toothed 31.
  • the latter and the cam disc 30 are mounted together in free rotation around the auxiliary shaft 3.
  • the toothed wheel 31 meshes with a toothed wheel 32 of the same dimension which is integral with the drive shaft 1.
  • the support 28 has approximately the shape of an inverted T.
  • One end of the tail is hingedly attached by means of a small pin 33 to one end of the connecting rod 27.
  • the support 28 is fixed articulated by a hinge pin 34 to a support 35 which is fixed to the auxiliary shaft 3 and is therefore also fixed relative to the rose lever 4.
  • the hinge pin 34 therefore oscillates back and forth together with the leaf 5 and the ros 4 around the shaft 3.
  • the cam follower 29 On one end of the head of the support 28 approximately in the shape of a T, the cam follower 29 has been fixed in rotation by means of a small pin 36.
  • the other end of the head is fixed by means of a small pin 37 to a piston 38 which penetrates by one end into a cylindrical opening 39 of the support 35. Between the bottom of the opening 39 and the piston 38 is situated in . the opening 39, a pressure spring 40 which pushes the piston 38 outwards and therefore ensures that the cam follower 29 remains constantly in contact with the cam disc 30.
  • the assembly formed by the support 35, the support 28, the transmission constituted by the lever 21 and the connecting rod 27 and the weft knife 10 accompanies the oscillation of the ros lever 4, of the leaf 5 and of the ros 6.
  • the support 28 will have to perform an alternative oscillation around its hinge axis 34 relative to the above-mentioned assembly. This oscillation is transmitted via the lever 21 and the connecting rod 27 to the weft chisel 10. In the position of the support 28 illustrated in the figures, the movable knife 16 is in its lowest position and the weft knife 10 is therefore closed. In this position, the ros 6 is in its rearmost position, that is to say the furthest from the tissue.
  • the movable knife 16 is caused to pivot via the connecting rod 27 and the lever 21 and therefore the chisel frame 10 is open.
  • a guide plate 41 which is mounted in front of the fabric table 9 on the frame 2, pushes the weft thread into the open chisel.
  • the cam disc 30 is constructed such that immediately after the movable knife 16 is pivotally returned to its initial position. Therefore, the weft thread is first pinched between the movable knife 16 and the clamping piece 18, then it is cut.
  • the weft scissor 10 is completely closed.
  • weft scissor 10 Due to the fact that the weft scissor 10 is mounted in the immediate vicinity of the ros 6, the cutting of a weft thread having just been introduced into the crowd takes place in the immediate vicinity of the selvedge and the part of this thread weft still coming from the reserve reel is also gripped by the clamp in the immediate vicinity of the cut end.
  • the weft cutter mechanism therefore also forms a mechanism for the presentation of the weft yarn to a clamp, so that this presentation does not require any particular or additional mechanism. The weft loss is therefore extremely limited.
  • the weft chisel 10 can, in fact, be moved in this direction to allow adaptation of the cutting mechanism to different widths of fabric.
  • This is obtained in a simple manner thanks to the fact that the small axis 33, by means of which the connecting rod 27 is hingedly connected to the support 28, can slide in its longitudinal direction relative to the support 28.
  • the connecting rod 27 is located on one side around an end of small diameter of the minor axis 33. On this end is screwed a nut 42 intended to hold the connecting rod 27 in position.
  • the other part of the minor axis 33 which therefore has a larger diameter, has a relatively large length and slides to penetrate through an opening 43 in the support 28.
  • the cutting device described above can be adapted to very different fabric widths and, when the fabric width is changed, adapting the weft cutter mechanism is very simple. If when changing the width of the fabric, we replace the ros 6, we simply have to move the fixing part 13 of the weft chisel 10 and mount it in the correct place on the leaf 5. Therefore minor axis 33 then slides relative to the support 28, so that the transmission by rod between the weft chisel 10 and the support 28 remains ensured.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Description

L'invention est relative à un métier à tisser selon le préambule de la revendication 1.The invention relates to a weaving loom according to the preamble of claim 1.

Des métiers à tisser munis d'un dispositif coupe-trame sont connus entre autre par des documents US-A-4.077.438; DE-C-1.083.756; FR-A-2.277.916; FR-A-1.566.536 et DE-A-1.710.291.Weaving machines provided with a weft cutter device are known inter alia from documents US-A-4,077,438; DE-C-1,083,756; FR-A-2,277,916; FR-A-1.566.536 and DE-A-1.710.291.

Le document FR-A-1.566.536 concerne un métier dans lequel le mouvement de coupe du dispositif coupe-trame est obtenu comme résultante de deux mouvements: le mouvement de montée et de descente des ciseaux mêmes, commandé par une came, et la coupe au moyen des ciseaux par une came à coulisse.The document FR-A-1.566.536 relates to a trade in which the cutting movement of the weft cutter device is obtained as the result of two movements: the movement of raising and lowering of the scissors themselves, controlled by a cam, and cutting by means of scissors by a sliding cam.

Par ailleurs, le document DE-:-A-1.710.291 fait état d'un dispositif coupe-trame à double commande: un mouvement de pinçage et de coupe par un lévier à coulisse commandé par un exentrique.In addition, the document DE -: - A-1.710.291 mentions a weft cutter device with double control: a gripping and cutting movement by a sliding lever controlled by an eccentric.

D'une façon générale, les dispositifs coupe-trame connus sont d'un fonctionnement et d'une construction relativement compliqués.In general, the known weft cutters are of relatively complicated operation and construction.

L'invention a pour but d'éliminer ces inconvénients et d'offrir un métier à tisser avec dispositif coupe-trame dans lequel la perte en fil de trame à chaque duite est relativement faible tandis que le dispositif coupe-trame peut cependant être maintenu de construction relativement simple.The object of the invention is to eliminate these drawbacks and to offer a weaving loom with a weft cutter device in which the loss of weft yarn on each pick is relatively low while the weft cutter device can however be maintained relatively simple construction.

A cette fin, le métier à tisser suivant l'invention répond aux conditions telles que définies dans la partie caractérisante de la revendication 1.To this end, the weaving loom according to the invention meets the conditions as defined in the characterizing part of claim 1.

Dans une forme de réalisation particuliere de l'invention, la transmission par tringle entre le support du suiveur de came et le ciseau, comporte à une extrémité une bielle qui est fixée, à une certaine distance de l'axe d'articulation du support, de manière articulée autour d'un axe parallèle à cet axe d'articulation, sur le support précité.In a particular embodiment of the invention, the transmission by rod between the support of the cam follower and the chisel, comprises at one end a connecting rod which is fixed, at a certain distance from the axis of articulation of the support, articulated around an axis parallel to this axis of articulation, on the aforementioned support.

De préférence, la fixation articulée ou pivotante de la tringle à une extrémité de la transmission par tringle sur le support du suiveur de came est formée par un arbre par rapport auquel au moins l'un des éléments formé par la tringle précitée et le support peut tourner, arbre qui peut être déplacé suivant la direction longitudinale par rapport à au moins l'un des derniers éléments précités.Preferably, the articulated or pivoting attachment of the rod to one end of the rod transmission on the support of the cam follower is formed by a shaft with respect to which at least one of the elements formed by the aforementioned rod and the support can rotate, shaft which can be moved in the longitudinal direction relative to at least one of the last aforementioned elements.

Dans cette forme de réalisation, il est possible d'une façon simple avec les mêmes moyens destinés à ouvrir et fermer le ciseau à trame, de déplacer ce dernier suivant le sens de la largeur du métier à tisser, afin d'adapter par exemple ce ciseau à trame à la largeur du tissu.In this embodiment, it is possible in a simple way with the same means intended to open and close the weft scissor, to move the latter according to the direction of the width of the loom, in order to adapt for example this weft scissor the width of the fabric.

Dans une forme de réalisation avantageuse de l'invention, la transmission par tringle entre le support du suiveur et le ciseau à trame comporte à une extrémité une tringle qui est reliée positivement à l'un des couteaux du ciseau à trame et qui est donc articulé autour de l'axe de rotation autour duquel les couteaux peuvent pivoter l'un par rapport à l'autre, par rapport à l'autre couteau.In an advantageous embodiment of the invention, the rod transmission between the follower support and the weft chisel has at one end a rod which is positively connected to one of the knives of the weft chisel and which is therefore articulated about the axis of rotation about which the knives can pivot relative to each other, relative to the other knife.

Dans une forme de réalisation préférée de l'invention, le dispositif coupe-trame comporte une pièce de serrage et des moyens pour appliquer cette dernière élastiquement contre l'un des couteaux.In a preferred embodiment of the invention, the weft cutter device comprises a clamping part and means for applying the latter elastically against one of the knives.

Dans cette forme de réalisation, le dispositif coupe-trame agit également en tant que dispositif de présentation de la trame la pince, de telle sorte qu'aucun mécanisme auxiliaire n'est nécessaire pour cette présentation.In this embodiment, the weft cutter also acts as a weft presentation device for the gripper, so that no auxiliary mechanism is required for this presentation.

L'invention concerne également un dispositif coupe-trame destiné à être utilisé dans un métier à tisser suivant l'une des formes de réalisation précédentes.The invention also relates to a weft cutter device intended for use in a weaving loom according to one of the preceding embodiments.

D'autres détails et particularités de l'invention ressortiront de la description ci-après, donnée à titre d'exemple non limitatif et en se référant aux dessins annexés, dans lesquels:

  • La figure 1 est une vue en élévation latérale d'une partie du métier à tisser avec dispositif coupe-trame suivant l'invention.
  • La figure 2 est une vue en coupe suivant la ligne II-II de la figure 1.
  • La figure 3 est une vue en plan de dessus, à grande échelle, du ciseau à trame du dispositif coupe-trame du métier à tisser illustré à la figure 1.
Other details and particularities of the invention will emerge from the description below, given by way of nonlimiting example and with reference to the appended drawings, in which:
  • Figure 1 is a side elevational view of part of the loom with weft cutter device according to the invention.
  • Figure 2 is a sectional view along line II-II of Figure 1.
  • FIG. 3 is a top plan view, on a large scale, of the weft chisel of the weft cutter device of the weaving loom illustrated in FIG. 1.

Dans les diverses figures, des références identiques désignent des éléments analogues.In the various figures, identical references designate similar elements.

Le métier à tisser illustré aux dessins est d'un type connu avec des pinces et des barres à pinces rigides. Dans un but de simplification, le métier à tisser ne sera décrit ci-après et illustré dans les dessins annexés que dans la mesure nécessaire pour illustrer l'invention.The weaving loom illustrated in the drawings is of a known type with pliers and bars with rigid pliers. For the sake of simplification, the loom will be described below and illustrated in the accompanying drawings only to the extent necessary to illustrate the invention.

Le métier à tisser comprend un arbre d'entraînement 1 qui est supporté dans le bâti 2 et est entraîné par un moteur non illustré aux dessins.The loom includes a drive shaft 1 which is supported in the frame 2 and is driven by a motor not shown in the drawings.

Sur un arbre auxiliaire 3, qui peut être animé d'un mouvement de pivotement alternatif à l'aide d'une transmission connue non illustrée aux dessins à partir de l'arbre d'entraînement 1, est monté le levier de ros 4, qui porte à la partie supérieure le battant 5 et le ros 6. En face de ce dernier sont montées deux barres à pinces 7, qui portent chacune une pince 8. Ces barres à pince 7 et pinces 8 font parties du mécanisme d'introduction de trame qui introduit un fil de trame dans la foule ou intervalle de la chaîne. La première pince 8 saisit sur un côté du métier, le fil de trame qui est déroulé d'une bobine et le transmet, au milieu du métier à tisser, à l'autre pince 8 qui tire le fil encore plus loin à travers la foule. Le levier à ros 4, le battant 5 et le ros 6 peuvent être animés d'un mouvement de pivotement en va-et-vient par rapport à une table à tissu 9 montée sur le bâti 2 et qui soutient le tissu déjà formé.On an auxiliary shaft 3, which can be actuated by an alternating pivoting movement using a known transmission not illustrated in the drawings from the drive shaft 1, is mounted the rose lever 4, which carries at the upper part the leaf 5 and the ros 6. Opposite the latter are mounted two clamp bars 7, which each carry a clamp 8. These clamp bars 7 and clamps 8 are part of the weft introduction mechanism which introduces a weft thread into the crowd or interval of the warp. The first clamp 8 grabs on one side of the loom, the weft thread which is unwound from a reel and transmits it, in the middle of the loom, to the other clamp 8 which pulls the thread even further through the crowd . The ros lever 4, the leaf 5 and the ros 6 can be driven in a back-and-forth pivoting movement relative to a fabric table 9 mounted on the frame 2 and which supports the fabric already formed.

Sur le côté du métier à tisser à partir duquel le fil de trame est amené dans la foule et où donc, à chaque duite, le fil de trame est entraîné par la première pince, se trouve un mécanisme coupe-trame qui, lorsque le fil de trame a été complètement tiré à travers la foule, dé-coupe ce fil de trame afin que la pince, lors de la duite suivante, puisse à nouveau amener un bout libre du fil de trame à travers la foule suivante. Le mécanisme coupe-trame est constitué par un ciseau à trame, désigné dans son ensemble par la référence 10, et par une transmission entre ce ciseau et l'arbre d'entraînement 1, transmission qui commande l'ouverture et la fermeture du ciseau à trame.On the side of the loom from which the weft thread is brought into the crowd and where therefore, with each pick, the weft thread is driven by the first clamp, there is a weft cutter mechanism which, when the thread of weft has been completely pulled through the crowd, cut this weft thread so that the clamp, during the next pick, can again bring a free end of the weft thread through the next crowd. The weft cutter mechanism consists of a weft chisel, generally designated by the reference 10, and by a transmission between this chisel and the drive shaft 1, a transmission which controls the opening and closing of the chisel to frame.

Ainsi qu'il ressort en particulier de la figure 3, le ciseau à trame 10 comprend un couteau fixe 11 qui est fixé par deux boulons 12 à une certaine distance d'une pièce de fixation 13. Cette dernière est elle-même fixée par des boulons 14 et des écrous 15 au battant 5, immédiatement à côté du ros 6. Entre le couteau fixe 11 et la pièce de fixation 13 se trouve le couteau mobile 16, qui est monté à rotation par rapport à la pièce de fixation 13. Sur le côté du couteau mobile 16 opposé au couteau fixe 11, une pression est exercée par une pièce de serrage 18 qui pénètre partiellement dans une ouverture 19 de la pièce de fixation 13. Un ressort 20 repousse cette pièce de serrage hors de l'ouverture 19, avec sa tête contre le couteau 16.As can be seen in particular from FIG. 3, the weft scissor 10 comprises a fixed knife 11 which is fixed by two bolts 12 at a certain distance from a fixing piece 13. The latter is itself fixed by bolts 14 and nuts 15 to leaf 5, immediately next to ros 6. Between the fixed knife 11 and the fixing piece 13 is the movable knife 16, which is rotatably mounted relative to the fixing piece 13. On the side of the movable knife 16 opposite the stationary knife 11, pressure is exerted by a clamping piece 18 which partially penetrates into an opening 19 of the fixing piece 13. A spring 20 pushes this clamping piece out of the opening 19 , with his head against the knife 16.

La fixation articulée du couteau mobile 16 sur la pièce de fixation 13 est obtenue par l'intermédiaire d'un levier 21 de la transmission précitée. Le couteau 16 est rendu solidaire positivement par des boulons 22 d'une extrémité du levier 21, extrémité qui est articulée sur un arbre 24 vissé fermement par une extrémité dans le couteau fixe 11. Cet arbre s'étend suivant la direction de la trame, de telle sorte que le couteau mobile 16 peut être déplacé dans un plan vertical s'étendant parallèlement aux fils de chaîne. Un ressort de pression 23 est disposé autour de l'arbre 24, entre une plaquette 17 fixée à l'extrémité de cet arbre 24 et le couteau mobile 16, et il repousse ce dernier contre le couteau fixe 11. Il est évident que les boulons 12 ne doivent gêner ni le mouvement du couteau 16 par rapport au couteau fixe 11, ni le basculement correspondant du levier 21.The articulated fixing of the movable knife 16 on the fixing piece 13 is obtained by means of a lever 21 of the aforementioned transmission. The knife 16 is positively secured by bolts 22 of one end of the lever 21, which end is articulated on a shaft 24 screwed firmly by one end into the fixed knife 11. This shaft extends in the direction of the frame, so that the movable knife 16 can be moved in a vertical plane extending parallel to the warp threads. A pressure spring 23 is arranged around the shaft 24, between a plate 17 fixed to the end of this shaft 24 and the movable knife 16, and it pushes the latter against the fixed knife 11. It is obvious that the bolts 12 must not hinder the movement of the knife 16 relative to the stationary knife 11, nor the corresponding tilting of the lever 21.

L'extrémité du levier 21 éloignée du ciseau à trame 10 est dotée d'une rainure 25 s'étendant suivant la direction longitudinale. Dans cette rainure 25 pénètre un arbre 26 qui s'étend parallèlement à l'arbre 24 et qui relie le levier 21 à une seconde bielle 27. Cette dernière est constituée par trois parties pouvant être vissées l'une dans l'autre, ce qui permet d'ajuster la longueur de la bielle. Le levier 21 et la bielle 27 forment une transmission par tringle entre le couteau mobile 16 et le support 28 d'un suiveur de came 29. Ce dernier est une roulette qui circule sur un disque de came 30. Ce dernier est fixé contre une roue dentée 31. Cette dernière et le disque de came 30 sont montés conjointement en rotation libre autour de l'arbre auxiliare 3. La roue dentée 31 engrène avec une roue dentée 32 de même dimension qui est solidaire de l'arbre d'entraînement 1.The end of the lever 21 remote from the weft chisel 10 is provided with a groove 25 extending in the longitudinal direction. In this groove 25 penetrates a shaft 26 which extends parallel to the shaft 24 and which connects the lever 21 to a second connecting rod 27. The latter consists of three parts which can be screwed into one another, which allows you to adjust the length of the connecting rod. The lever 21 and the connecting rod 27 form a rod transmission between the movable knife 16 and the support 28 of a cam follower 29. The latter is a wheel which circulates on a cam disc 30. The latter is fixed against a wheel toothed 31. The latter and the cam disc 30 are mounted together in free rotation around the auxiliary shaft 3. The toothed wheel 31 meshes with a toothed wheel 32 of the same dimension which is integral with the drive shaft 1.

Le support 28 a approximativement la forme d'un T renversé. Une extrémité de la queue est fixée de façon articulée au moyen d'un petit axe 33 à une extrémité de la bielle 27. A l'endroit de la jonction de la .queue et de la tête du T, le support 28 est fixé de façon articulée par un axe d'articulation 34 à un appui 35 qui est fixé à l'arbre auxiliaire 3 et est donc également fixe par rapport au levier de ros 4. L'axe d'articulation 34 oscille donc en va-et-vient conjointement avec le battant 5 et le ros 4 autour de l'arbre 3. Sur une extrémité de la tête du support 28 approximativement en forme de T, le suiveur de came 29 a été fixé à rotation au moyen d'un petit axe 36. L'autre extrémité de la tête est fixée au moyen d'un petit axe 37 à un piston 38 qui pénètre par une extrémité dans une ouverture cylindrique 39 de l'appui 35. Entre le fond de l'ouverture 39 et le piston 38 est situé, dans . l'ouverture 39, un ressort de pression 40 qui repousse le piston 38 vers l'extérieur et assure donc que le suiveur de came 29 reste constamment en contact avec le disque de came 30. L'ensemble formé par l'appui 35, le support 28, la transmission constituée par le levier 21 et la bielle 27 et le couteau à trame 10 accompagne l'oscillation du levier de ros 4, du battant 5 et du ros 6. Etant donné que le disque de came 30 tourne également en continu et que le suiveur de came 29 circule sur ce disque de came 30, le support 28 sera amené à effectuer une oscillation alternative autour de son axe d'articulation 34 par rapport à l'ensemble précité. Cette oscillation est transmise par l'intermédiaire du levier 21 et de la bielle 27 au ciseau à trame 10. Dans la position du support 28 illustrée aux figures, le couteau mobile 16 se trouve dans sa position la plus basse et le couteau à trame 10 est donc fermé. Dans cette position, le ros 6 se trouve dans sa position la plus en arrière, c'est-à-dire la plus éloignée du tissu. Lors du pivotement de l'oscillation vers l'avant du ros 6 et à cause de l'oscillation du support 28, le couteau mobile 16 est amené à pivoter par l'intermédiaire de la bielle 27 et du levier 21 et par conséquent le ciseau à trame 10 est ouvert. Une plaque de guidage 41, qui est montée devant la table à tissu 9 sur le bâti 2, repousse le fil de trame dans le ciseau ouvert. Le disque de came 30 est construit de telle sorte qu'immédiatement après le couteau mobile 16 est ramené par pivotement à sa position initiale. De ce fait, le fil de trame est d'abord pincé entre le couteau mobile 16 et la pièce de serrage 18, puis il est découpé. Quand le ros 6 a atteint sa position la plus en avant, le ciseau à trame 10 est complètement fermé. La partie du fil de trame qui vient d'être introduite dans la foule est alors complètement libre de la partie de ce fil provenant de la bobine de réserve ou d'alimentation. L'extrémité la plus en avant de cette dernière partie se trouve encore dans le ciseau, entre le couteau mobile 16 et la pièce de serrage 18. Lors du retour à sa position la plus en arrière du ros 6, la partie du fil de trame qui s'étend entre le ciseau 10 et la bobine d'alimentation est ainsi offerte à une pince 8, de telle sorte que cette dernière peut à nouveau saisir le fil de trame au voisinage immédiat de l'extrémité avant découpée de la dernière partie précitée du fil de trame, afin d'amener celui-ci lors de la phase suivant dans la foule. A cause du fait que le ciseau à trame 10 est monté au voisinage immédiat du ros 6, le découpage d'un fil de trame venant d'être introduit dans la foule a lieu au voisinage immédiat de la lisière et la partie de ce fil de trame provenant encore de la bobine de réserve est également saisie par la pince au voisinage immédiat de l'extrémité découpée. Le mécanisme coupe-trame forme donc aussi un mécanisme pour la présentation du fil de trame à une pince, de telle sorte que cette présentation n'exige aucun mécanisme particulier ou supplémentaire. La perte en fil de trame est donc extrêmement limitée.The support 28 has approximately the shape of an inverted T. One end of the tail is hingedly attached by means of a small pin 33 to one end of the connecting rod 27. At the location of the junction of the tail and the head of the T, the support 28 is fixed articulated by a hinge pin 34 to a support 35 which is fixed to the auxiliary shaft 3 and is therefore also fixed relative to the rose lever 4. The hinge pin 34 therefore oscillates back and forth together with the leaf 5 and the ros 4 around the shaft 3. On one end of the head of the support 28 approximately in the shape of a T, the cam follower 29 has been fixed in rotation by means of a small pin 36. The other end of the head is fixed by means of a small pin 37 to a piston 38 which penetrates by one end into a cylindrical opening 39 of the support 35. Between the bottom of the opening 39 and the piston 38 is situated in . the opening 39, a pressure spring 40 which pushes the piston 38 outwards and therefore ensures that the cam follower 29 remains constantly in contact with the cam disc 30. The assembly formed by the support 35, the support 28, the transmission constituted by the lever 21 and the connecting rod 27 and the weft knife 10 accompanies the oscillation of the ros lever 4, of the leaf 5 and of the ros 6. Since the cam disc 30 also rotates continuously and that the cam follower 29 circulates on this cam disc 30, the support 28 will have to perform an alternative oscillation around its hinge axis 34 relative to the above-mentioned assembly. This oscillation is transmitted via the lever 21 and the connecting rod 27 to the weft chisel 10. In the position of the support 28 illustrated in the figures, the movable knife 16 is in its lowest position and the weft knife 10 is therefore closed. In this position, the ros 6 is in its rearmost position, that is to say the furthest from the tissue. During the pivoting of the forward oscillation of the ros 6 and due to the oscillation of the support 28, the movable knife 16 is caused to pivot via the connecting rod 27 and the lever 21 and therefore the chisel frame 10 is open. A guide plate 41, which is mounted in front of the fabric table 9 on the frame 2, pushes the weft thread into the open chisel. The cam disc 30 is constructed such that immediately after the movable knife 16 is pivotally returned to its initial position. Therefore, the weft thread is first pinched between the movable knife 16 and the clamping piece 18, then it is cut. When the ros 6 has reached its most forward position, the weft scissor 10 is completely closed. The part of the weft thread which has just been introduced into the crowd is then completely free from the part of this wire from the supply or supply coil. The most forward end of this last part is still in the chisel, between the movable knife 16 and the clamping piece 18. When returning to its rearmost position of the ros 6, the part of the weft thread which extends between the chisel 10 and the supply reel is thus offered to a clamp 8, so that the latter can again grasp the weft thread in the immediate vicinity of the cut front end of the last aforementioned part weft thread, in order to bring it during the next phase in the crowd. Due to the fact that the weft scissor 10 is mounted in the immediate vicinity of the ros 6, the cutting of a weft thread having just been introduced into the crowd takes place in the immediate vicinity of the selvedge and the part of this thread weft still coming from the reserve reel is also gripped by the clamp in the immediate vicinity of the cut end. The weft cutter mechanism therefore also forms a mechanism for the presentation of the weft yarn to a clamp, so that this presentation does not require any particular or additional mechanism. The weft loss is therefore extremely limited.

Tandis que la roue dentée 32, et donc aussi la roue dentée associée 31, le disque de came 30 et le support 28 avec le suiveur de came 29 ne peuvent pas être déplacés suivant la direction longitudinale des arbres 1 et 3, le ciseau à trame 10 peut, en fait, être déplacé suivant cette direction pour permettre une adaptation du mécanisme de découpage à différentes largeurs de tissu. Ceci est obtenu d'une manière simple grâce au fait que le petit axe 33, à l'aide duquel la bielle 27 est reliée de façon articulée au support 28, peut coulisser suivant sa direction longitudinale par rapport au support 28. La bielle 27 est située sur un côté autour d'une extrémité de petit diamètre du petit axe 33. Sur cette extrémité est vissé un écrou 42 destiné à maintenir la bielle 27 en position. L'autre partie du petit axe 33, qui a donc un plus grand diamètre, a une relativement grande longueur et pénètre à coulissement à travers une ouverture 43 dans le support 28. De cette façon, le dispositif de découpe décrit précédemment peut être adapté à des largeurs de tissus très différentes et, lors d'une éventuelle modification de la largeur du tissu, l'adaptation du mécanisme coupe-trame est très simple. Si lors d'une modification de la largeur du tissu, on remplace le ros 6, on doit simplement déplacer la pièce de fixation 13 du ciseau à trame 10 et la monter à l'endroit correct sur le battant 5. De ce fait, le petit axe 33 coulisse alors par rapport au support 28, de telle sorte que la transmission par tringle entre le ciseau à trame 10 et le support 28 reste assurée.While the toothed wheel 32, and therefore also the associated toothed wheel 31, the cam disc 30 and the support 28 with the cam follower 29 cannot be moved in the longitudinal direction of the shafts 1 and 3, the weft chisel 10 can, in fact, be moved in this direction to allow adaptation of the cutting mechanism to different widths of fabric. This is obtained in a simple manner thanks to the fact that the small axis 33, by means of which the connecting rod 27 is hingedly connected to the support 28, can slide in its longitudinal direction relative to the support 28. The connecting rod 27 is located on one side around an end of small diameter of the minor axis 33. On this end is screwed a nut 42 intended to hold the connecting rod 27 in position. The other part of the minor axis 33, which therefore has a larger diameter, has a relatively large length and slides to penetrate through an opening 43 in the support 28. In this way, the cutting device described above can be adapted to very different fabric widths and, when the fabric width is changed, adapting the weft cutter mechanism is very simple. If when changing the width of the fabric, we replace the ros 6, we simply have to move the fixing part 13 of the weft chisel 10 and mount it in the correct place on the leaf 5. Therefore minor axis 33 then slides relative to the support 28, so that the transmission by rod between the weft chisel 10 and the support 28 remains ensured.

Claims (12)

1. Loom, with weft-cutting device (10), said loom comprising a frame (2), a driving shaft (1) supported inside said frame (2), a batten (5) mounted on said frame (2) with a to-and-fro swinging capacity, means (21, 27, 30, 31) to swing the batten (5) alternately and a weft-feeding mechanism (7, 8) to feed a weft into at least one shed or interval, while the weft-cutting device (10) cooperates with the weft-feeding mechanism (7, 8) and comprises a weft shear proper with two knives (11, 16) movable relative to one another, and means to open and close said weft shear, loom in which the weft shear (10) is mounted on the batten (5) and moves together with the swinging thereof, said means to open and close said weft shear comprising a cam disk (30) rotatably mounted on the loom, a transmission (31, 32) between the cam disk (30) and the driving shaft (19) to drive said cam disk, a cam follower (29) which rides on the cam disk, a support (28) on which said cam follower is mounted, which support is hingedly mounted on the batten (5) to convert a swinging motion of the support (28) into a folding-back of at least one knife (16) from the weft shear, said loom being characterized in that the cam disk (30) is rotatably mounted about an axis common with the rotation axis of the batten (5), and the means for swing alternately the batten (5) also cooperate with the weft shear (10) to open same, a rod transmission (21, 27) being provided between the support (28) and the movable knife (16) from the shear (10), said knife being positively controlled by the rod (21).
2. Loom as defined in claim 1, characterized in that the cam disk (30) is mounted to rotate freely on the auxiliary rotation shaft (3) from the batten (5).
3. Loom as defined in either one of claims 1 and 2, characterized in that the rod transmission (21, 27) between the support (28) for the cam follower (29) and the weft shear (11, 16) comprises on the one end, a link (27) hingedly connected some distance away from the support hinge axis (34), about a small shaft (33) extending in parallel relationship with said hinge axis, to said support (28).
4. Loom as defined in claim 3, characterized in that the hinged connection of the link (27) at the one end of the rod transmission, to the support (28) for the cam follower (29), is formed by a small shaft (33) relative to which at least one of those elements comprised of said link and the support (28), can rotate, which small shaft (33) is moable along the lengthwise direction thereof relative to at least the one said elements.
5. Loom as defined in any one of the preceding claims, characterized in that the rod transmission (21, 27) between the support (28) for the cam follower (29) and the weft shear (10) comprises at the one end, a lever (21) positively connected to the one knife (16) from the weft shear, and which is thus hinged about the rotation axis about which the movable knife (16) can swing relative to the fixed knife (11).
6. Loom as defined in either one of claims 3 and 5, characterized in that the rod transmission (21, 27) between the support (28) for the cam follower (29) and the weft shear (10) is comprised of a link (27) which is hingedly connected some distance away from the support rotation axis, to said support with a lever (21) which is so hinged as to be slidable over a very short distance inside the end of the link (27) and which is fixedly connected to the one knife (16) from the weft shear (10).
7. Loom as defined in any one of the preceding claims, characterized in that the one part of the rod transmission is formed by the small shaft (33), and in that the link (27) is adjustable in the length.
8. Loom as defined in any one of the preceding claims, characterized in that the weft-cutting device (10) comprises a clamping part (18) and means (20) to press said part resiliently against the movable knife (16).
9. Loom as defined in claim 8, characterized in that the weft shear (10) comprises a fastener (13) which is secured to the batten (5) and to which is connected the fixed knife (11) from the shear (10), while the movable knife (16) is mounted between the fixed knife (11) and the fastener (13), the clamping part 18 being resiliently mounted on said fastener (13) and being pressed against the movable knife (16).
10. Loom as defined in any one of the preceding claims, in which the cam disk (30) is mounted to rotate freely about the auxiliary shaft (3) from the loom, and the transmission between said cam disk (30) and the driving shaft (1) comprises a wheel (31) fixedly connected to the cam disk (30) and having the same rotation axis, and transmission means (32) between said wheel and the driving shaft (1).
11. Loom as defined in claim 10, characterized in that the wheel (31) which is connected to the cam disk (30) is a gear wheel and the transmission means between said wheel and the driving shaft are comprised of a gear transmission (31, 39).
12. Weft-cutting device, used in a loom as defined in any one of the preceding claims.
EP19790102460 1978-07-28 1979-07-16 Loom with weft cutting device and such a device for use therein Expired EP0007543B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE189601 1978-07-28
BE189601A BE869386A (en) 1978-07-28 1978-07-28 Loom with weft cutting direction and weft cutting device used therein

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EP0007543A1 EP0007543A1 (en) 1980-02-06
EP0007543B1 true EP0007543B1 (en) 1983-04-06

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Application Number Title Priority Date Filing Date
EP19790102460 Expired EP0007543B1 (en) 1978-07-28 1979-07-16 Loom with weft cutting device and such a device for use therein

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DE (1) DE2965138D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3373319D1 (en) * 1982-09-02 1987-10-08 Wiele Michel Van De Nv Weft yarn control device for shuttleless looms
US4489762A (en) * 1983-04-11 1984-12-25 Draper Corporation Weaving loom selvedge trimmer drive mechanism
JP2560569B2 (en) * 1991-06-03 1996-12-04 株式会社豊田自動織機製作所 Weft processing device for shuttleless loom
CN105463668A (en) * 2016-01-05 2016-04-06 高阳县慧强纺织机械制造有限公司 Weft shearing device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1290866A (en) * 1961-02-14 1962-04-20 Alsacienne Constr Meca Further training in pick cutters in shuttle-less looms
DE1710244B2 (en) * 1967-03-17 1977-03-24 Elitex, Koncern Textilniho Strojirenstvi, Reichenberg (Tschechoslowakei) METHOD AND DEVICE FOR CUTTING THE WEFT FEEDS ON GRIPPER WEB MACHINES
DE1710291B2 (en) * 1967-04-22 1973-10-04 Fa. S. Lentz, 4060 Viersen Device for cutting and clamping weft threads on rapier weaving machines
ES193243Y (en) * 1973-07-07 1975-01-16 Incotex, S. A. PERFECTED MECHANISM OF CUTTING, CLAMPING AND PRESENTATION OF THE FRAME FOR LOOMS.
US3899008A (en) * 1974-07-10 1975-08-12 Rockwell International Corp Weft cutter control apparatus
JPS5310966U (en) * 1976-06-25 1978-01-30

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EP0007543A1 (en) 1980-02-06
DE2965138D1 (en) 1983-05-11

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