EP3073003B1 - Métiers à tisser comprenant un dispositif de rentrage avec tête d'exploitation mobile comprenant un mécanisme de levier de commande - Google Patents

Métiers à tisser comprenant un dispositif de rentrage avec tête d'exploitation mobile comprenant un mécanisme de levier de commande Download PDF

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Publication number
EP3073003B1
EP3073003B1 EP16161562.0A EP16161562A EP3073003B1 EP 3073003 B1 EP3073003 B1 EP 3073003B1 EP 16161562 A EP16161562 A EP 16161562A EP 3073003 B1 EP3073003 B1 EP 3073003B1
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Prior art keywords
tuck
levers
control
head
travelling
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EP16161562.0A
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German (de)
English (en)
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EP3073003A1 (fr
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Stefano Calzaferri
Andrea Panzetti
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Itema SpA
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/40—Forming selvedges
    • D03D47/48—Forming selvedges by inserting cut end of weft in next shed, e.g. by tucking, by blowing

Definitions

  • the present invention refers to a control leverage mechanism for tuck-in devices meant for weaving machines and in particular to tuck-in devices the operating head of which alternately moves in the warp direction, during each weft insertion cycle.
  • the selvedge-forming devices consist of mechanical, electric, pneumatic devices, or combinations thereof, which are used in shuttle-less weaving looms for forming a false selvedge (thus defined in opposition to the true selvedge which is formed in shuttle weaving looms) along the lateral edge of the fabric being woven, steadily fastening the weft tails which laterally protrude from the cloth being woven, after the insertion and cutting of the weft yarns.
  • This operation is performed through an operating head of the tuck-in device which, in various possible operating modes, of a mechanical, electronic, pneumatic or mixed type, grabs the free weft tail of the last inserted weft, immediately after the closing of the shed and the beating of the reed against such weft, and immediately inserts it back into the shed, thus anticipating both shed closing and the reed beating-up on the subsequent weft, so that said weft tail is steadily retained in position among the warp yarns together with said subsequent weft, thus causing selvedge forming, as an alternative to the free fringe of weft tails, with remarkable advantages in terms of stability and resistance of the fabric edges during the subsequent processing and handling of the fabric.
  • Tuck-in devices are more frequently provided with a fixed operating head and they are positioned at the two sides of the cloth being woven next to the reed. Since one or more pieces of a reduced width are often simultaneously woven on the loom width, in order to allow the positioning of the tuck-in devices with fixed operating head within the loom shed, it is of course necessary to shorten or cut the reed into two or more segments, since, in the contrary, a mechanical interference would occur between the reed and the tuck-in device during reed movement.
  • Tuck-in devices with travelling operating head solve this problem due to the fact that the travelling head thereof is provided with an alternate movement in the direction of the warp yarns, which movement allows the backward travel of said operating head during reed beating-up and the subsequent quick forward travel of the same in the immediately subsequent step. It is hence possible to operate with these tuck-in devices with a whole reed, that is, a reed which extends across the entire loom width, regardless of the size and of the number of cloths simultaneously processed on the loom.
  • Tuck-in devices with a fixed head of a different structure and actuating system are disclosed for example in EP 0286443 , US 4905740 and US 2006/0207676 .
  • a weft-cutting device was furthermore made integral, according to an arrangement already known for a long time, so that said device follows the head of the tuck-in device in the alternate movement thereof in a longitudinal direction, to be able to perform weft cutting at the selected time, after the insertion of said weft into the shed.
  • the control of the above-said cutting device was independent from the control of the travelling head of the tuck-in device and was normally entrusted to a pneumatic or electric device.
  • a first critical point of the control of the travelling head of the tuck-in device illustrated above consists in the linear guides on which the travelling head of the tuck-in device slides.
  • these guides are sensitive components which generally require, in order to provide regular performances and a satisfactory life duration, a lubrication system or, at least, regular greasing operations, in order to avoid too quick a wear with the forming of plays which reduce the reliability of the device.
  • a second critical point can be identified in the cam system per se, linked to the need to provide a suitable lubrication, or at least a regular greasing of the cam-follower rollers. Such rollers then present serious reliability problems in this type of applications.
  • a first object of the present invention is hence to offer a travelling-head tuck-in device provided with a new-concept control which does not require the use of cylindrical guides to obtain the alternate translation movement of the travelling head.
  • a second object of the present invention is the removal of a system which provides the use of any cam system for generating the alternate motion of the travelling head.
  • a third object of the present invention is then to offer a tuck-in device wherein the execution of the weft cut may be performed without the use of pneumatic or electric actuators and hence allows a simpler, more effective and cheaper construction.
  • forward and forward movement it is meant to refer to the progression direction of the fabric on the loom, represented in the drawing by arrow T.
  • backward and backward movement indicate of course the opposite direction.
  • control leverage mechanism of a tuck-in device in order to achieve the first and the second object highlighted above, consists of the following functional groups of levers, highlighted in fig. 2 :
  • said first rod-crank mechanism G1 lies at the dead point thereof when the travelling head of the tuck-in device is at the backward operating position thereof.
  • the connecting rod of said rod-crank mechanism G1 has a longitudinal movement having a direction consistent with the movement of the sley S.
  • control leverage mechanism of a tuck-in device in order to achieve the third object highlighted above, furthermore comprises the following functional group of levers:
  • said weft cutting device furthermore comprises a fixed cutting blade, integral with the travelling head of the tuck-in device.
  • the first articulated quadrilateral Q1 consists of the sley S, of a forward-transmission connecting rod LF and of a lever L1 hinged in A to the body CC of the tuck-in device and hence comprises two hinges 1 and A fixed with respect to the loom, and two moving hinges 2 and 3.
  • Rod-crank mechanism G1 consists of a lever L2 and of a backward-transmission connecting rod LR hinged in B on the travelling head LC of the tuck-in device and hence comprises a fixed hinge A and two moving hinges 4 and B.
  • Levers L1 and L2 hinged in A form with each other a suitably determined fixed angle.
  • Parallelogram P1 consists of a pair of identical and mutually parallel levers LP; said levers are hinged in 5 and 6 to the body CC of the tuck-in device and in 7 and 8 to the travelling head of the tuck-in device, schematised in the figs. 1 to 3 by a body LC.
  • the second articulated quadrilateral Q2 consists of a first lever L3, of an upward-transmission connecting rod LH and of a lever L4 integral with a moving cutting blade 9.
  • Said cutting blade 9 forms a weft cutting device together with a fixed cutting blade 10 which is integral with the travelling head LC of the tuck-in device.
  • Lever L3 is integral with backward-transmission connecting rod LR and consists in an extension thereof beyond hinge point B of the same.
  • the second articulated quadrilateral Q2 hence comprises two hinges B and C, fixed with respect to the travelling head LC of the tuck-in device, and two moving hinges 12 and 13.
  • the leverage mechanism of the present invention illustrated above has the features indicated in the following.
  • the first articulated quadrilateral Q1 which has the function of taking the movement from the sley S for generating the rotation of the lever L1 on hinge A, has a similar structure to that of the known devices mentioned in the introductory part.
  • Rod-crank mechanism G1 provides to transform the rotary motion of lever L1 into a translation movement of connecting rod LR.
  • the movement of such lever has the feature of being consistent with that of the sley, and can hence be directly used for generating a movement of the travelling head of the tuck-in device synchronous with that of the sley, and furthermore it exploits - through an adequate choice of the angle between levers L1 and L2 - the dead point position of the rod-crank mechanism for generating an almost stationary condition at the point of utmost backward movement, that is an area where, despite continuing the movement of the sley S, the travelling head LC of the tuck-in device is virtually stationary and can hence correctly perform the operation of insertion of the weft tail into the shed.
  • Articulated quadrilateral Q2 exploits the further rotation of lever L3 on hinge B, during the almost stationary condition step of connecting rod LR along the longitudinal direction, for generating the rotation of lever L4 on hinge C, which hence operates the moving cutting blade 9.
  • connecting rod LH of articulated quadrilateral Q2 is of an adjustable length, for example through an eccentric, so that it is easily possible to change the initial angular position of lever L4 and hence the adjustment of the cutting instant.
  • lever L3 on hinge B occurs mostly when rod-crank mechanism G1 is in the dead point area and hence precisely in the time period in which the travelling head LC of the tuck-in device is almost stationary and the cutting device must operate.
  • Rod-crank mechanism G1 hence performs a twofold function, exploiting in two different ways the dead point area thereof, that is for determining first an almost stationary condition of the travelling head LC of the tuck-in device and, in such step, for continuing the rotation to operate the cutting device through the articulated quadrilateral Q2.
  • Parallelogram P1 used about the quadrature thereof, allows to the travelling head LC of the tuck-in device a movement along a sufficiently wide arc which can be approximated to a rectilinear movement.
  • This part of the leverage mechanism hence replaces the cylindrical guides of the known devices, with an evident construction simplification and a dramatic reduction of maintenance interventions.
  • the entire leverage mechanism is structured so as to allow the removal of the bearings, due to generally rather modest angular travels. This allows to further reduce the costs of the device and to further simplify the maintenance thereof.

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

Claims (16)

  1. Métier à tisser comprenant un peigne diviseur (S) et un dispositif de rentrage à tête mobile comprenant un mécanisme de levier de commande, caractérisé en ce que ledit mécanisme de levier de commande comprend les groupes de leviers fonctionnels suivants :
    - un premier quadrilatère articulé (Q1) dont les charnières d'extrémité (1, A) sont fixées sur le métier, qui permet le mouvement alterné dudit peigne diviseur (S) ;
    - un mécanisme de bielle-manivelle (G1) qui reçoit sur une manivelle (L2), le mouvement du premier quadrilatère articulé (Q1) et le transmet via une bielle (LR) à la tête mobile (LC) du dispositif de rentrage sur lequel l'extrémité mobile de ladite bielle (LR) est articulée (en B) ; et
    - un parallélogramme articulé (P1) qui raccorde un corps (CC) du dispositif de rentrage à la tête mobile (LC) de ce dernier, pour guider ladite tête mobile (LC) du dispositif de rentrage entre une position initiale vers l'avant et une position de fonctionnement vers l'arrière, le long d'un arc assez large pour se rapprocher d'un mouvement rectiligne.
  2. Métier à tisser avec un mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 1, dans lequel ledit mécanisme de bielle-manivelle (G1) est à son point mort lorsque la tête mobile (LC) du dispositif de rentrage est dans sa position de fonctionnement vers l'arrière.
  3. Métier à tisser avec un mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 2, dans lequel la bielle (LR) dudit premier mécanisme de bielle-manivelle (G1) a un mouvement longitudinal ayant une direction cohérente avec le mouvement du peigne diviseur (S).
  4. Métier à tisser avec un mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 3, dans lequel ledit mécanisme de bielle-manivelle (G1) est à son point mort avant que ledit peigne diviseur (S) n'ait atteint sa position la plus en arrière.
  5. Métier à tisser avec un mécanisme de levier de commande d'un dispositif de rentrage selon les revendications 1 à 4, comprenant en outre les groupes de leviers fonctionnels suivants :
    - un second quadrilatère articulé (Q2) dont les charnières d'extrémité (B, C) sont fixées à la tête mobile (LC) du dispositif de rentrage, le levier de commande (L3) dudit quadrilatère se composant d'une extension de l'extrémité de commande de la bielle (LR) du premier mécanisme de bielle-manivelle (G1), au-delà du raccordement de charnière (B) avec la tête mobile (LC) du dispositif de rentrage, et le levier commandé (L4) étant solidaire de la lame de coupe mobile (9) d'un dispositif de coupe de trame, ledit dispositif de coupe de trame comprenant en outre une lame de coupe fixe (10), solidaire de la tête mobile (LC) du dispositif de rentrage.
  6. Métier à tisser avec un mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 5, dans lequel ledit premier quadrilatère articulé (Q1) se compose dudit peigne diviseur (S), d'une bielle de transmission vers l'avant (LF) et d'un levier (L1) articulé (en A) au corps (CC) du dispositif de rentrage.
  7. Métier à tisser avec un mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 6, dans lequel l'angle fixe formé par les leviers (L1) et (L2) est calculé afin d'amener le mécanisme de bielle-manivelle (G1) dans sa zone de point mort au début du cycle de fonctionnement du dispositif de rentrage.
  8. Métier à tisser avec un mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 7, dans lequel ledit parallélogramme (P1) se compose d'une paire de leviers identiques et parallèles (LP), lesdits leviers étant articulés, au niveau d'une extrémité (en 5 et 6), au corps (CC) du dispositif de rentrage et au niveau de l'extrémité opposée (en 7 et 8) à la tête mobile (LC) du dispositif de rentrage.
  9. Métier à tisser avec un mécanisme de levier de commande d'un dispositif de rentrage selon l'une quelconque des revendications précédentes, dans lequel les déplacements angulaires des leviers au niveau des charnières sont petits et les charnières sont dépourvues de paliers et de lubrification.
  10. Mécanisme de levier de commande d'un dispositif de rentrage à tête mobile pour un métier à tisser, caractérisé en ce qu'il comprend les groupes de leviers fonctionnels suivants :
    - un premier quadrilatère articulé (Q1), dont les charnières d'extrémité (1, A) peuvent être fixées au métier, pour prendre le mouvement alterné de son levier ;
    - un mécanisme de bielle-manivelle (G1) qui reçoit, sur la manivelle (L2), le mouvement du premier quadrilatère articulé (Q1) et le transmet via la bielle (LR) à la tête mobile (LC) du dispositif de rentrage sur lequel l'extrémité mobile de ladite bielle (LR) est articulée (en B) ; et
    - un parallélogramme articulé (P1) qui raccorde le corps (CC) du dispositif de rentrage à la tête mobile (LC) de ce dernier, pour guider ladite tête mobile (LC) du dispositif de rentrage entre une position initiale vers l'avant et une position de fonctionnement vers l'arrière, le long d'un arc assez large pour se rapprocher d'un mouvement rectiligne.
  11. Mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 10, dans lequel ledit mécanisme de bielle-manivelle (G1) est à son point mort lorsque la tête mobile (LC) du dispositif de rentrage est dans sa position de fonctionnement vers l'arrière.
  12. Mécanisme de levier de commande d'un dispositif de rentrage selon les revendications 10 et 11, comprenant en outre le groupe de leviers fonctionnels suivant :
    - un second quadrilatère articulé (Q2), dont les charnières d'extrémité (B, C) sont fixées à la tête mobile (LC) du dispositif de rentrage, le levier de commande (L3) dudit quadrilatère se composant d'une extension de l'extrémité de commande de la bielle (LR) du premier mécanisme de bielle-manivelle (G1), au-delà du raccordement de charnière (B) avec la tête mobile (LC) du dispositif de rentrage, et le levier commandé (L4) étant solidaire avec la lame de coupe mobile (9) d'un dispositif de coupe de trame, ledit dispositif de coupe de trame comprenant en outre une lame de coupe fixe (10), solidaire avec la tête mobile (LC) du dispositif de rentrage.
  13. Mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 12, dans lequel ledit premier quadrilatère articulé (Q1) se compose d'un levier d'entraînement (S), d'une bielle de transmission vers l'avant (LF) et d'un levier (L1) articulé (en A) au corps (CC) du dispositif de rentrage.
  14. Mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 13, dans lequel l'angle fixe formé par les leviers (L1) et (L2) est calculé afin d'amener le mécanisme de bielle-manivelle (G1) dans sa zone de point mort au moment du départ du cycle de fonctionnement du dispositif de rentrage.
  15. Mécanisme de levier de commande d'un dispositif de rentrage selon la revendication 14, dans lequel ledit parallélogramme (P1) se compose d'une paire de leviers identiques et parallèles (LP), lesdits leviers étant articulés au niveau d'une extrémité (en 5 et 6) au corps (CC) du dispositif de rentrage et au niveau de l'extrémité opposée (en 7 et 8) à la tête mobile (LC) du dispositif de rentrage.
  16. Mécanisme de levier de commande d'un dispositif de rentrage selon l'une quelconque des revendications 10 à 15, dans lequel les déplacements angulaires des leviers au niveau des charnières sont petits et les charnières sont dépourvues de paliers et de lubrification.
EP16161562.0A 2015-03-26 2016-03-22 Métiers à tisser comprenant un dispositif de rentrage avec tête d'exploitation mobile comprenant un mécanisme de levier de commande Active EP3073003B1 (fr)

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CN (1) CN106012248A (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600122838A1 (it) * 2016-12-02 2018-06-02 Itema Spa Leverismo di comando per cimossatrice a testa di lavoro mobile per macchine tessili

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT992532B (it) * 1973-05-04 1975-09-30 Doriguzzi Sas Dispositivo per l azionamento degli aghi portatrama nei telai tessili senza navetta
CH624440A5 (en) * 1976-07-30 1981-07-31 Silvio Sbabo Device on a weaving machine for cutting off, holding and bending round the weft-thread end to form the selvedge
JPS54156862A (en) * 1978-05-30 1979-12-11 Ishikawa Seisakusho Kk Apparatus for cutting and gripping weft yarn end in tuck in apparatus
IT1208212B (it) 1987-04-10 1989-06-12 Ind Cremonese S P A Soc Dispositivo posizionatore dellatrama sulle macchine per tessere che utilizzano cimossatrici a capo rientrante.
BE1001310A3 (nl) 1987-12-22 1989-09-19 Picanol Nv Inrichting voor het vormen van een zelfkant aan een weefsel bij weefmachines.
IT1244762B (it) * 1991-03-08 1994-08-08 Nuovo Pignone Spa Meccanismo perfezionato di selezione della movimentazione degli organi mobili del dispositivo di formazione di una cimossa rientrata, particolarmente adatto ai telai per spugna
DE502006007250D1 (de) 2005-02-23 2010-08-05 Itema Switzerland Ltd Leistenleger für Schussfäden

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JP2016183442A (ja) 2016-10-20
CN106012248A (zh) 2016-10-12
EP3073003A1 (fr) 2016-09-28

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