EP0896075B1 - Dispositif de présentation de fil de trame pour métiers à tisser - Google Patents

Dispositif de présentation de fil de trame pour métiers à tisser Download PDF

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Publication number
EP0896075B1
EP0896075B1 EP19980114840 EP98114840A EP0896075B1 EP 0896075 B1 EP0896075 B1 EP 0896075B1 EP 19980114840 EP19980114840 EP 19980114840 EP 98114840 A EP98114840 A EP 98114840A EP 0896075 B1 EP0896075 B1 EP 0896075B1
Authority
EP
European Patent Office
Prior art keywords
rods
carrying
driving
rod
presenting device
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 - Lifetime
Application number
EP19980114840
Other languages
German (de)
English (en)
Other versions
EP0896075A2 (fr
EP0896075A3 (fr
Inventor
Giuseppe Casarotto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Promatech SpA
Original Assignee
Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP0896075A2 publication Critical patent/EP0896075A2/fr
Publication of EP0896075A3 publication Critical patent/EP0896075A3/fr
Application granted granted Critical
Publication of EP0896075B1 publication Critical patent/EP0896075B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/38—Weft pattern mechanisms

Definitions

  • the present invention concerns a weft presenting device for looms.
  • the weft yarn insertions, and the exchanges of position of the warp yarns obtained through the weave devices suitably follow one another and lead to the forming of the desired fabric.
  • Such devices consist of devices performing the function to select the weft yarns to be inserted, and present them to the carrying grippers which provide for their insertion.
  • Such devices substantially comprise one or more rods provided, at their working end, with an eyelet through which is let a respective weft yarn: the movement of the rods involves shifting the eyelets and thus the position of the corresponding weft yarns sliding therethrough.
  • the weft yarns are thereby alternately shifted from a position of rest, away from the trajectory of the gripper, into a "presenting" position in which they can be caught by the carrying gripper and carried towards and into the warp shed.
  • the EP-A1-598.264 in the name of PICANOL N.V., discloses a presenting device wherein the single rods are independently controlled by electric motors, through cam mechanisms.
  • the electric motors do not perform continuous, but alternate rotations, in one direction and in the other, between a position corresponding to the top dead center and a position corresponding to the bottom dead center of the respective rod. Hence, the adjustment of such motors requires a complicated electronic control system.
  • the head of the rod namely its end connected to the cam mechanism, follows a curved trajectory involving the surrounding area: it is thus necessary to provide for a sufficient lateral spacing between one rod and the next, in order to prevent a mutual interference thereof.
  • the EP-A1-598.264 provides for the single rods, with the respective drive mechanisms, to be mounted on corresponding support plates, so as to form modules positioned one next to the other without any interferences: it is evident that such a multiple presenting device covers on the whole a considerable space sidewise, which - as already stated - is highly undesirable.
  • the trajectory of the rod eyelet end is not rectilinear, but is also curved. This, besides determining bounds in the mutual arrangement of the rods, forces to adopt oscillating guide bushes, which may cause seizures and jammings and which anyhow represent a delicate and costly component.
  • EP 0 362 089 discloses an articulated drive mechanism in which two drive rods are connected each other and with an eccentric pin of a motor by using spatial bearings; the presenting rod driven by said mechanism is constrained against lateral forces by two sliding bushes.
  • the EP-B1-461.524 in the name of the present Applicant, discloses a presenting device wherein the rods are singly controlled by electric linear motors.
  • the object of the present invention is to thus supply a weft presenting device apt to fully overcome the aforecited drawbacks, and particularly a device allowing to singly control each weft yarn presenting rod, both in synchronism with the working motion of the loom and independently therefrom, while simultaneously providing an easy control of the device, a simple and economic structure and, at the same time, a modularity and compactedness which allow to obtain a multiple presenting device involving minimum overall dimensions and competitive costs.
  • a device to select and present weft yarns to a carrying gripper in looms - of the type comprising a set of rods having an eyelet to let the weft yarns through, rod guiding elements and a rotary driving motor for each rod - in which exact straight-line guide mechanisms are interposed between the driving motors and said rods.
  • the weft presenting device is positioned in correspondence of the loom side of weft yarn insertion. It comprises a set of weft carrying rods 1 provided, at their working end 1a (figs. 2A and 2B) with an eyelet 2 to let the weft yarn through, said rods 1 being guided into guide bushes 3.
  • the shifting of a rod 1 leads the corresponding weft yarn T, sliding through the respective eyelet 2, to interfere with the trajectory followed by the loom carrying gripper N, so as to allow this latter to clamp said weft yarn and insert it into the warp shed.
  • each rod 1 of the presenting device is connected, through its head 1b, to an outlet member 10 of a driving mechanism 11 controlled by a respective electric motor M.
  • the motor M is preferably an electric step-by-step motor.
  • the driving mechanism 11 reproduces an exact straight-line guide.
  • the mechanism 11 of the present invention is preferably that illustrated in figs. 4 and 5.
  • a housing C - on which the electric step-by-step motor M is mounted - contains the elements forming the exact straight-line guide.
  • a rotor 12, rotatably mounted on a bearing 13, is fixed to the outlet shaft 14 of the electric motor M.
  • a planetary gear 15 is rotatably mounted on the rotor 12 by way of a support spindle 15a positioned parallel, but eccentric, in respect of the rotation axis of the shaft 14.
  • the gear 15 has an external toothing 16 meshing with an internal gear 17 applied into or formed in one piece with the housing C.
  • Said driving mechanism 11 allows to change the purely rotary motion of the motor shaft 14 into a reciprocating straightaway motion of the pin 10 (figs. 4B and 4C); in fact, the rolling of the planetary gear 15 over the internal gear 17 leads the pin 10 to follow a rectilinear trajectory (fig. 4C) while spinning, thus performing a full rotation for each rotation of the motor shaft 14.
  • the pin 10 follows a law which is perfectly sinusoidal in time, if the rotation of the electric motor M is continuous and constant, but it may follow different laws by suitably controlling the electric motor M.
  • This mechanism 11 is to be able to perform a reciprocating straightaway motion without the help of cam mechanisms, or other type of eccentrics, which forcedly require to reverse the rotation of the motor in order to obtain a reciprocating motion. This results into a substantially easy control of the motor M, thereby reaching a first object of the present invention.
  • the perfectly rectilinear movement of the rods allows to adopt fixed bushes 3 - rather than oscillating bushes, as in prior art - thereby reaching a second object of the present invention.
  • Fig. 5 illustrates the two opposite positions of the planetary gear 15, in correspondence of the two end-of-stroke positions of the rod 1.
  • the rod 1 performs a straightaway motion along a vertical axis (in respect of the plane of the drawing).
  • Fig. 3 shows a weft presenting device with nine rods, wherein all the units are mounted, drawn close, onto a same support plate P.
  • the different inclination of the rods 1 allows the various weft yarns, inserted into the single eyelets 2, to substantially converge in the same restricted area (shown by small circles). This last characteristic is very important to make sure that the weft yarns are presented in an optimal zone, to be caught by the carrying gripper N.
  • the keying of the blocks 18 on the respective spindles 15a can be identical for all the rods 1 (as shown, for example, in fig. 5) and the different inclinations of the rods are obtained by mounting the driving mechanisms 11 on the support plate P according to different angles (this condition is not shown) instead of equal angles (as in fig. 3).
  • This last mounting arrangement is advantageous, in that it does not require a specific keying of the blocks 18 for each position taken up by the mechanisms 11, and thus allows an easy and prompt interchangeableness of such driving mechanisms.
  • the device according to the invention is easy to assemble and disassemble, to the full advantage of its maintenance.
  • a proximity sensor S detects the position of the head 1b of the rod 1, then timing the working motion of the loom with the rotation of the motor M.
  • the electronic control of the electric step-by-step motor M also allows to obtain motion laws for the rods 1 which perfectly fulfil the requirements of the specific product having to be woven, without having to replace or modify any mechanical component of the system.
  • the various units of the weft presenting device - instead of being drawn close onto a same support plate, as in fig. 3 - could be positioned according to different geometries, at least partially opposite one to the other, or mutually offset.
  • the driving mechanism 11 has been described herein, other embodiments can be conceived for the exact straight-line guide, all falling within the protection field of the present invention.

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

Claims (5)

  1. Dispositif pour sélectionner et présenter des fils de trame à une pince porteuse dans des métiers - du type comprenant un jeu de barres (1) comportant un oeillet (2) pour laisser passer les fils de trame, des éléments de guidage de barres (3), un moteur d'entraínement rotatif (M) pour chaque barre (1) ne tournant que dans un seul sens et un mécanisme guide d'alignement exact intercalé entre chaque moteur (M) et lesdites barres (1) - caractérisé en ce que ledit mécanisme guide d'alignement exact n'est doté que de manchons d'accouplement rotatifs par paires sous la forme d'un rotor fixé à l'arbre (14) du moteur d'entraínement (M) et supportant de manière excentrique par rapport audit arbre (14) un engrenage planétaire (15) s'engrenant avec un engrenage intérieur (17), lequel engrenage planétaire (15) supporte une cheville excentrique (10) entraínant lesdites barres (1), la trajectoire de ladite cheville (10) étant rectiligne.
  2. Dispositif selon la revendication 1, dans lequel ledit engrenage planétaire (15) supporte une broche coaxiale (15a) à l'extrémité de laquelle ladite cheville d'entraínement (10) est supportée excentriquement..
  3. Dispositif selon la revendication 2, dans lequel lesdits moteurs d'entraínement (M) sont des moteurs rotatifs pas à pas, électriques.
  4. Dispositif selon la revendication 1, 2 ou 3, dans lequel ledit élément de guidage de barre (3) consiste en une douille fixe.
  5. Dispositif selon la revendication 4, dans lequel les barres (1), les douilles de guidage (3), le mécanisme guide d'alignement exact (11) et les moteurs d'entraínement (M) sont tous montés sur une même plaque de support (P), de manière que les barres (1) puissent converger vers la zone dans laquelle les fils de trame sont serrés par la pince porteuse (N) du métier.
EP19980114840 1997-08-07 1998-08-06 Dispositif de présentation de fil de trame pour métiers à tisser Expired - Lifetime EP0896075B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI001900 IT1293828B1 (it) 1997-08-07 1997-08-07 Presentatrice di trama per telai di tessitura
ITMI971900 1997-08-07

Publications (3)

Publication Number Publication Date
EP0896075A2 EP0896075A2 (fr) 1999-02-10
EP0896075A3 EP0896075A3 (fr) 1999-06-16
EP0896075B1 true EP0896075B1 (fr) 2003-10-01

Family

ID=11377738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980114840 Expired - Lifetime EP0896075B1 (fr) 1997-08-07 1998-08-06 Dispositif de présentation de fil de trame pour métiers à tisser

Country Status (4)

Country Link
EP (1) EP0896075B1 (fr)
DE (1) DE69818588T2 (fr)
ES (1) ES2209013T3 (fr)
IT (1) IT1293828B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4310233A1 (fr) * 2022-07-19 2024-01-24 Picanol Dispositif pour la sélection et la présentation de fils de trame

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1353000A1 (fr) * 2002-04-10 2003-10-15 Lin, Chen-Hui Dispositif de sélection de trame pour métier à tisser les rubans
EP1500731B1 (fr) * 2003-07-10 2006-01-18 Promatech S.p.A. Dispositif de présentation de fil de trame pour métiers à tisser avec une seule barre de présentation
ATE356236T1 (de) 2004-06-25 2007-03-15 Luigi Omodeo Zorini Nadelwebmaschine mit automatischem wechsel des schussfadens
ATE421602T1 (de) * 2005-10-20 2009-02-15 Luigi Omodeo Zorini Nadelwebmaschine mit automatischem schussfadenwechsel
ITUB20160421A1 (it) * 2016-02-01 2016-05-01 Rinaldo Sperotto PRESENTATRICE ROTATIVA per macchine da tessere a preselezione meccanica e comando elettronico
EP4310234A1 (fr) * 2022-07-19 2024-01-24 Picanol Dispositif de sélection et de présentation de fils de trame

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1043098B (it) * 1975-10-03 1980-02-20 Somet Soc Mec Tessile Presentatrice della trama per te lai di tessitura ad alimentazio ne continua della trama
CH650290A5 (de) * 1981-06-09 1985-07-15 Saurer Ag Adolph Schussfaden-auswahlvorrichtung an einer webmaschine.
FR2636979B1 (fr) * 1988-09-27 1990-11-02 Marsande Petrus Dispositif d'alimentation des fils de trame pour metiers a tisser sans navette
BE1003978A3 (nl) * 1989-05-18 1992-07-28 Picanol Nv Inrichting voor het presenteren van inslagdraden bij weefmachines.
CH682498A5 (de) * 1990-10-05 1993-09-30 Walter Kleiner Schussfadenauswahl- und Zuführvorrichtung für Webmaschine.
BE1006347A3 (nl) * 1992-11-16 1994-07-26 Picanol Nv Inrichting voor het presenteren van inslagdraden bij weefmachines.
DE4325905C1 (de) * 1993-08-02 1994-10-06 Dornier Gmbh Lindauer Vorrichtung zum Zuführen von Schußfäden zu einem Schußfadeneintragorgan in Webmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4310233A1 (fr) * 2022-07-19 2024-01-24 Picanol Dispositif pour la sélection et la présentation de fils de trame
WO2024017541A1 (fr) * 2022-07-19 2024-01-25 Picanol Dispositif de sélection et de présentation de fils de trame
BE1030686B1 (nl) * 2022-07-19 2024-06-17 Picanol Inrichting voor het selecteren en presenteren van inslagdraden

Also Published As

Publication number Publication date
DE69818588T2 (de) 2004-08-05
EP0896075A2 (fr) 1999-02-10
DE69818588D1 (de) 2003-11-06
EP0896075A3 (fr) 1999-06-16
ES2209013T3 (es) 2004-06-16
ITMI971900A1 (it) 1999-02-07
IT1293828B1 (it) 1999-03-10

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