EP0461524B1 - Dispositif de présentation de fil de trame pour métiers à griffer - Google Patents

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

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Publication number
EP0461524B1
EP0461524B1 EP91109116A EP91109116A EP0461524B1 EP 0461524 B1 EP0461524 B1 EP 0461524B1 EP 91109116 A EP91109116 A EP 91109116A EP 91109116 A EP91109116 A EP 91109116A EP 0461524 B1 EP0461524 B1 EP 0461524B1
Authority
EP
European Patent Office
Prior art keywords
presenting
weft
yarn
rods
gripper
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
EP91109116A
Other languages
German (de)
English (en)
Other versions
EP0461524A1 (fr
EP0461524B2 (fr
Inventor
Luigi Pezzoli
Rossano Maffeo
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.)
NUOVA VAMATEX SpA
Original Assignee
NUOVA VAMATEX SpA
Vamatex Nuova SpA
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Publication date
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Application filed by NUOVA VAMATEX SpA, Vamatex Nuova SpA filed Critical NUOVA VAMATEX SpA
Publication of EP0461524A1 publication Critical patent/EP0461524A1/fr
Publication of EP0461524B1 publication Critical patent/EP0461524B1/fr
Application granted granted Critical
Publication of EP0461524B2 publication Critical patent/EP0461524B2/fr
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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 yarn presenting device for gripper looms.
  • one or more weft yarns are inserted by a pair of grippers with alternate motion, cooperating at the centre of the shed, into the sequence of the warp yarns forming said shed.
  • presenting devices i.e. devices performing the function of selecting the weft yarns to be inserted and presenting them to the weft carrying or insertion grippers.
  • Such devices substantially comprise one or more rods having an eyelet into which passes a respective wet yarn to be presented. When one of said eyelets moves, it shifts the respective weft yarn from a rest position far from the gripper trajectory, to another position (called presenting position) wherein the weft yarn can be gripped by the carrying gripper and conveyed towards and into the warp shed.
  • weft control ends when the gripper moves out of the warp shed and the selection step requires a certain time for the yarn to be hooked, which depends on the force of the electromagnet and/or on the masses of the mechanical hooking elements having to be shifted.
  • said time corresponds to wider rotation angles of the loom for the selection step, hence to the detriment of the angles utilizable for the presenting step, the reduction of which leads to an increase in the mechanical stresses, in the wears and in the vibrations of the presenting device.
  • one is forced to anticipate the start of the selection step before the outlet of the gripper from the warp shed - which outlet determines the final time within which weft control can take place - rather than reducing the times for the presenting step.
  • the mechanical presenting devices require furthermore a motion transmission obtained with a mechanical drive by means of belts, chains or gears, which cause problems of alignment on assembly, require maintenance and limit the choice of the most suitable positioning on the loom for a proper weaving operation.
  • Said device is of the type comprising a plurality of presenting rods having a yarn guiding eyelet, which converge towards the zone in which the weft yarn has to be gripped by the loom carrying gripper and which are each controlled by a linear electric motor through a flexible cable sliding into a sheath, and is characterized in that electronic control means are associated to each linear electric motor of the device for constantly detecting the position of the presenting rod operated by said motor and for governing the motor, according to said position, to the working of the loom and to the physical/textile features of the yarn being woven.
  • each of the presenting rods can act so as to regulate the tension of the weft yarn moved by the same.
  • the device according to the invention comprises - in known manner - a plurality of presenting rods 1, ending with an eyelet 2 for the weft yarn f and each controlled by a flexible cable 3 sliding into a sheath 4.
  • Figure 1 shows, by way of example, a device with eight rods 1, of which only one can be seen in figure 2. Also in known manner the rods 1, which are slidably guided into stiff guides 5 wherein their rotation is prevented, converge into the zone P where the weft yarn has to be gripped by the loom carrying gripper to be drawn into the shed.
  • the most suitable position of the guides 5, and thus of the rods 1 - for an efficient presenting of the various weft yarns - is obtained by acting on adjustable supports 6.
  • each of the flexible cables 3 controlling the rods 1 is operated by a linear electric motor.
  • the linear electric motors 7 are positioned radially, each aligned on the common axis of the rod 1, of the flexible cable 3 and of the corresponding guide 5 and sheath 4. These motors act directly on the flexible cables 3, causing short rectilinear alternate movements thereof, of adjustable amplitude. Equal movements are thus imparted on the rods 1.
  • the linear electric motors 8 are positioned in block and they operate the flexible cables 3 each through a rotating lever 9, to which the cable 3 is anchored in 10 and which is caused to perform, by the respective motor 8, short angular back and forth movements of adjustable amplitude (to which correspond short rectilinear alternate movements, of adjustable amplitude, of the rods 1).
  • linear electric motors used are of the conventional type and are hence not described in detail; it should simply be remembered that they allow to perform very precise movements, even if of limited amplitude, and to carry out a very precise adjustment of the operating times, of the working speeds, of the length and amplitude of the movements.
  • the presenting device is completed by electronic control means - preferably comprising a microprocessor - which also require no particular description as they are of conventional type. These means, shown by 11 in figure 2, are connected to the electronic control system 12 of the loom - to which the presenting device of the invention is applied - and to the linear electric motors 7 or 8, so as to allow constantly detecting, by way of a position sensor 13, the position taken up by the corresponding presenting rods 1.
  • the control system can therefore detect the tension of the weft yarn being inserted by the gripper into the warp shed, by measuring the feed current required by the bobbin to balance the force resulting on the eyelet 2. It ensues that the rod 1 in a presenting position can also act - see figure 4 - as tension regulator during insertion, in that, according to the position of the eyelet 2 at the end of the presenting rod 1, in respect of fixed yarnguides 14, 15, weft yarn tension (T) varies to a certain extent during insertion. In fact, the more the eyelet 2 moves down in respect of the yarnguides 14, 15, the wider the winding angles of the weft yarn around said yarnguides.
  • the device according to the invention requires no mechanical motion transmissions and can thus be associated to the loom in the most functional area, for instance in a position high above the presenting area, so as not to hamper the intervention of the weaver and the insertion of the wefts.

Claims (5)

1. Dispositif de présentation de fil de trame pour métiers à pinces, du type comprenant une pluralité de tiges de présentation (1) comportant un oeillet de guidage de fil (2), qui convergent vers la zone (P) dans laquelle le fil de trame doit être saisi par la pince de transport du métier et qui sont chacune commandées par un câble flexible (3) coulissant dans une gaine (4), caractérisé en ce que chacun des câbles flexibles commandant lesdites tiges est actionné par un moteur électrique linéaire (7, 8) et en ce qu'un moyen de commande électronique (11) est associé à chaque moteur électrique linéaire (7, 8) pour détecter en permanence la position de la tige de présentation actionnée par ledit moteur et pour régler le moteur, en fonction de ladite position, du fonctionnement du métier et des caractéristiques textiles physiques du fil étant tissé.
2. Dispositif selon la revendication 1, dans lequel le fonctionnement de chaque moteur actionnant les tiges de présentation (1), et donc les mouvements de présentation et de retour de chaque fil de trame, peuvent être programmés ainsi que les mouvements, la vitesse, l'accélération, les temps d'arrêt dans la position de présentation et dans la position de repos, en fonction des caractéristiques textiles physiques du fil et avec la possibilité de prendre en compte la position de la trame au repos par rapport à la pince.
3. Dispositif selon la revendication 2, dans lequel les courses, les vitesses, les accélérations, et les moments de début et/ou de fin de la loi de présentation et/ou de retour, sont modifiés en fonction de la tendance statistique des arrêts de trame détectés par le système de commande du métier (12).
4. Dispositif selon la revendication 2, adapté à signaler au technicien toute anomalie au moyen d'un programme de diagnostic approprié.
5. Dispositif selon la revendication 1, dans lequel chacune des tiges de présentation (1) peut servir à ajuster la tension du fil de trame qu'elle déplace.
EP91109116A 1990-06-11 1991-06-04 Dispositif de présentation de fil de trame pour métiers à griffer Expired - Lifetime EP0461524B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT02059890A IT1248715B (it) 1990-06-11 1990-06-11 Dispositivo di presentazione della trama per telai di tessitura a pinze
IT2059890 1990-06-11

Publications (3)

Publication Number Publication Date
EP0461524A1 EP0461524A1 (fr) 1991-12-18
EP0461524B1 true EP0461524B1 (fr) 1995-02-22
EP0461524B2 EP0461524B2 (fr) 1999-03-10

Family

ID=11169360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109116A Expired - Lifetime EP0461524B2 (fr) 1990-06-11 1991-06-04 Dispositif de présentation de fil de trame pour métiers à griffer

Country Status (8)

Country Link
EP (1) EP0461524B2 (fr)
AT (1) ATE118831T1 (fr)
DE (1) DE69107517T3 (fr)
DK (1) DK0461524T3 (fr)
ES (1) ES2069120T5 (fr)
GR (1) GR3015932T3 (fr)
HK (1) HK46396A (fr)
IT (1) IT1248715B (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
IT1273103B (it) * 1994-04-05 1997-07-04 Panter Srl Dispositivo di presentazione dei fili di trama per una macchina di tessitura
DE29713979U1 (de) 1997-07-04 1997-10-16 Textilma Ag Kettenwirkmaschine, insbesondere Häkelgalonmaschine
IT1293506B1 (it) * 1997-07-30 1999-03-01 Nuovo Pignone Spa Dispositivo modulare per la presentazione dei fili di trama nei telai tessili senza navetta
IT1293507B1 (it) * 1997-07-30 1999-03-01 Nuovo Pignone Spa Dispositivo selettore per la presentazione dei fili di trama nei telai tessili senza navetta
JP2000220060A (ja) 1999-01-28 2000-08-08 Sulzer Textil Ag レピア織機の緯糸供給装置及び配列構造
EP1024214B1 (fr) * 1999-01-28 2006-05-17 Sultex AG Dispositif et système pour positioner un fil de trame dans un métier à tisser à griffes
EP1099784B1 (fr) 1999-09-23 2009-11-11 ITEMA (Switzerland) Ltd. Métier à tisser avec système d'insertion pour une pluralité de fils de trame en règle générale différents
DE50015789D1 (de) 1999-09-23 2009-12-24 Itema Switzerland Ltd Webmaschine mit einem Eintragungssystem für eine Mehrzahl von in der Regel unterschiedlicher Schussfäden
EP1353000A1 (fr) * 2002-04-10 2003-10-15 Lin, Chen-Hui Dispositif de sélection de trame pour métier à tisser les rubans
DE60303286T2 (de) * 2003-07-10 2006-07-27 Promatech S.P.A., Colzate Schussfadenzubringvorrichtung für Webmaschinen mit einer einzigen Zubringstange
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH418248A (de) * 1964-10-26 1966-07-31 Scheffel Walter Farbenwechselapparat für schützenlose Webmaschinen
CH450315A (de) * 1967-05-09 1968-01-15 Rueti Ag Maschf Anordnung zum wahlweisen Zubringen von Schussfäden verschiedener Art an eine Fadenübernahmestelle
US3780775A (en) * 1972-08-25 1973-12-25 Rockwell International Corp Weft control mechanism for shuttleless looms
JPS57205553A (en) * 1981-06-10 1982-12-16 Tsudakoma Ind Co Ltd Weft yarn selector of loom
DE3315320A1 (de) * 1983-04-27 1984-10-31 Emil Jäger GmbH & Co KG, 4400 Münster Vorrichtung zum eintragen von schussfaeden bei webmaschinen

Also Published As

Publication number Publication date
DE69107517T3 (de) 2000-08-10
EP0461524A1 (fr) 1991-12-18
DK0461524T3 (da) 1995-07-24
ES2069120T3 (es) 1995-05-01
DE69107517T2 (de) 1995-08-10
HK46396A (en) 1996-03-22
ATE118831T1 (de) 1995-03-15
GR3015932T3 (en) 1995-07-31
EP0461524B2 (fr) 1999-03-10
ES2069120T5 (es) 1999-08-01
IT9020598A0 (fr) 1990-06-11
DE69107517D1 (de) 1995-03-30
IT1248715B (it) 1995-01-26
IT9020598A1 (it) 1991-12-11

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