EP1013808B1 - Träger und Führungselement für die Führungsbahn für die Greiferbände in eine Greiferwebmaschine - Google Patents

Träger und Führungselement für die Führungsbahn für die Greiferbände in eine Greiferwebmaschine Download PDF

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Publication number
EP1013808B1
EP1013808B1 EP99125835A EP99125835A EP1013808B1 EP 1013808 B1 EP1013808 B1 EP 1013808B1 EP 99125835 A EP99125835 A EP 99125835A EP 99125835 A EP99125835 A EP 99125835A EP 1013808 B1 EP1013808 B1 EP 1013808B1
Authority
EP
European Patent Office
Prior art keywords
support
strap
gripper
guide
guide element
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
EP99125835A
Other languages
English (en)
French (fr)
Other versions
EP1013808A1 (de
Inventor
Stefano Nanni
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 EP1013808A1 publication Critical patent/EP1013808A1/de
Application granted granted Critical
Publication of EP1013808B1 publication Critical patent/EP1013808B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/277—Guide mechanisms
    • 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
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/271—Rapiers
    • D03D47/272—Rapier bands

Definitions

  • the present invention concerns a support and guide element to form guide tracks for gripper straps in a gripper loom.
  • Strap guide tracks of this type are known, in the sector, as "floating" tracks, as opposed to the conventional tracks wherein the strap bears with its bottom surface onto a suitable sliding surface formed on the sley, rubbing onto the lower warp yarns.
  • the strap is instead supported, along its path, by a plurality of support and guide elements positioned at intervals along the track and fixed to the sley, so that the strap moves in an intermediate position of the loom shed, without thereby interfering either with the lower warp yarns or with the upper warp yarns.
  • a strap guide track of this type is known, for example, from EP-A-275.479.
  • This new type of track has provided a high number of advantages in respect of the previous tracks, thanks to the "open" configuration of the bracket type support and guide elements which, on one hand, leads to a considerably reduced number of warp yarn breakages determined by the yarn getting caught into the support and guide elements and, on the other hand, allows to make the surfaces of the support and guide elements, onto which slides the strap, with characteristics of perfect flatness and smoothness, thereby considerably reducing the phenomena of vibration and wear of the strap. Furthermore, the lack of a guiding support on the lateral surface of the strap prevents any possible roughening of its edges and, consequently, any possible negative effects due to pulling of the warp yarns sideways during motion of the strap.
  • the EP-A-709.505 has still not fully solved the problems determined by the presence in the shed of deeply angled warp yarns, such as can be found either at the ends of the shed - where the fabric gets laterally deformed due to the tensioning action of the templates - or even inside the shed, due to some irregularity which may have occurred during weft yarn insertion.
  • the sliding of the strap onto the support and guide elements may thus determine the breakage of the warp yarn, especially when this latter is positioned upstream of the tip of said elements in respect of the strap moving forward direction; in fact, in this case, the tip of the support and guide element imparts a pulling action on the warp yarn, preventing it from freely moving under the action of the advancing strap.
  • US-A-3842869 discloses support and guide elements for gripper straps in a gripper loom according to the preamble of claim 1, each of one comprises two separate sliding surfaces separated by a central saddle-shaped depression.
  • DE-U-29506561 discloses support and guide elements for gripper straps in a gripper loom, each of one comprises two separate sliding surfaces separated by a central U-shaped depression.
  • the object of the present invention is to thus supply a support and guide element to form guide tracks for gripper straps in looms which, while providing all the advantages of the aforedescribed support and guide elements of prior art, also allows to eliminate or anyhow considerably reduce the drawback of the frequent warp yarn breakages in the presence of deeply angled warp yarns.
  • said object is reached by means of a support and guide element to form guide tracks for gripper straps in a gripper loom according to claim 1.
  • Fig. 1 is an axonometric view, with an enlarged detail, showing a part of a loom weaving zone incorporating a known-type floating guide for the gripper straps;
  • Fig. 2 is an axonometric view of a lower support and guide element, shaped as an upturned bracket, according to an embodiment of the present invention
  • Fig. 3 is a side elevation of the support and guide element shown in fig. 2;
  • Fig. 4 is a plan view of the support and guide element of fig. 2;
  • the assembly view of fig. 1 represents a part of the loom weaving zone incorporating a known-type floating guide, so as to clearly illustrate the arrangement of the single components and, in particular, of the support and guide elements according to the present invention.
  • Fig. 1 shows the following loom components: the sley A comprising a rail R to which can be fixed the support and guide elements G; the reed P; the warp yarns O and the shed F formed by such yarns; a gripper S and the respective strap N; and, finally, the fabric T being woven.
  • the support and guide elements G are of two types and, precisely, the lower support and guide elements Gi shaped as upturned brackets and the upper support and guide elements Gs shaped as downturned brackets, alternately positioned along the rail R.
  • Figs. 2 to 4 show a lower support and guide element Gi, formed according to an embodiment of the invention.
  • the bracket horizontal surface of the support and guide elements according to the present invention comprises a central depression 1, so that the bracket surface, onto which slides the strap N, is reduced to two separate surfaces 2 and 3 between which is interposed said depression 1.
  • the depression 1 has a characteristic saddle shape, which is radiused to said horizontal strap sliding surfaces 2 and 3 only sideways in respect of a plane of symmetry of the support and guide element G, whose trace is indicated in fig. 4 by the dashed line a .
  • the two sliding surfaces 2 and 3 extend into said depression with arched buttresses 2a and 3a having substantially vertical walls, radiused only at their base to the saddle-shaped surface of the depression 1, as shown in fig, 3.
  • This particular configuration of the depression 1 allows, on one hand, to obtain an overall area of the sliding surface of the strap N (sum of the areas of the surfaces 2 and 3) which is sufficiently wide as not to impart any excessive stresses to said strap and, on the other hand, to highly facilitate the shifting of any possible angled warp yarns 0 into one of the two positions illustrated in figs. 2 and 4, namely inside the depression 1 and away from the surfaces 2 and 3.
  • the embodiment of the support and guide elements according to the present invention is particularly meant for yarns which are more likely to get entangled as, for example, in the case of natural yarns.
  • the presence of the buttress 2a on the surface 2 facilitates the fast shifting of the warp yarn O, while the presence of the buttress 3a on the surface 3 prevents the warp yarns 0 - in the event they should be pulled by the gripper - from bearing onto said surface 3.
  • the warp yarns 0 behave as described heretofore both in correspondence of the lower support and guide elements Gi - shown in figs. 2 to 4 - and in correspondence of the upper support and guide elements Gs.
  • the configurations of the horizontal bracket surface of the upper support and guide elements Gs, and thus of the depression 1 provided therein, are in fact perfectly symmetrical to those described for the lower bracket elements Gi.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (1)

  1. Trag- und Führungselement zur Bildung von Führungsbahnen für die Greiferbänder in einer Greiferwebmaschine, von der Art mit wenigstens einer horizontalen Gleitfläche für das Band (N), die wie ein Träger von dem Körper des Trag- und Führungselements (G) vorragt, wobei die Gleitfläche für das Band (N) eine sattelförmige Vertiefung (1) aufweist, die auf dem horizontalen Träger des Trag- und Führungselements (G) zwei gesonderte Gleitflächen (2, 3) für das Band (N) ausbildet, dadurch gekennzeichnet, dass die sattelförmige Vertiefung (1) zu den Bandgleitflächen (2, 3) in Bezug auf eine Symmetrieebene des Trag- und Führungselements (G) nur seitlich gekrümmt ist, während sich die beiden Gleitflächen (2, 3) mit bogenförmigen Stützen (2a, 3a) mit im wesentlichen vertikalen Wänden in die Vertiefung (1) erstrecken.
EP99125835A 1998-12-23 1999-12-23 Träger und Führungselement für die Führungsbahn für die Greiferbände in eine Greiferwebmaschine Expired - Lifetime EP1013808B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998MI002808A IT1303652B1 (it) 1998-12-23 1998-12-23 Gancino per piste di guida dei nastri delle pinze in un telaio ditessitura a pinze
ITMI982808 1998-12-23

Publications (2)

Publication Number Publication Date
EP1013808A1 EP1013808A1 (de) 2000-06-28
EP1013808B1 true EP1013808B1 (de) 2004-05-12

Family

ID=11381332

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99125835A Expired - Lifetime EP1013808B1 (de) 1998-12-23 1999-12-23 Träger und Führungselement für die Führungsbahn für die Greiferbände in eine Greiferwebmaschine

Country Status (5)

Country Link
EP (1) EP1013808B1 (de)
AT (1) ATE266754T1 (de)
DE (1) DE69917197T2 (de)
ES (1) ES2221295T3 (de)
IT (1) IT1303652B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049254B4 (de) * 2004-10-05 2013-07-25 Picanol Greifertransportelement für eine Webmaschine
DE102004049256B4 (de) * 2004-10-05 2014-01-02 Picanol Führungselemente für ein Greifertransportelement einer Webmaschine
DE102004049255B4 (de) * 2004-10-05 2013-07-18 Picanol Führungselemente für ein Greifertransportelement einer Webmaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE658330A (de) * 1964-01-17 1900-01-01
ES400984A1 (es) * 1972-03-04 1975-02-01 Desveus Duran Perfeccionamientos en la construccion de maquinas de tejer sin lanzadera.
US3842869A (en) * 1973-10-09 1974-10-22 Rockwell International Corp Tapeguide raceway for rapier loom
IT1171737B (it) * 1983-10-10 1987-06-10 Vamatex Spa Gancio per la guida di nastri portapinze all'interno del passo di telai di tessitura e complesso di guida con esso realizzabile
IT1198246B (it) * 1986-12-23 1988-12-21 Vamatex Spa Mezzi per guidare il moto di una coppia di pinze portatrama all'interno del passo di telai di tessitura
IT1270681B (it) * 1994-10-27 1997-05-07 Somet Soc Mec Tessile Pista guidanastri per telai di tessitura a pinze
DE29506561U1 (de) * 1995-04-18 1995-06-08 Textilma Ag, Hergiswil Webmaschine
GB2314095B (en) * 1996-06-14 2000-05-17 Griffith Textile Mach Ltd Gripper type loom

Also Published As

Publication number Publication date
DE69917197D1 (de) 2004-06-17
DE69917197T2 (de) 2005-05-19
ES2221295T3 (es) 2004-12-16
IT1303652B1 (it) 2001-02-21
ATE266754T1 (de) 2004-05-15
ITMI982808A1 (it) 2000-06-23
EP1013808A1 (de) 2000-06-28

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