EP1013808A1 - 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
EP1013808A1
EP1013808A1 EP99125835A EP99125835A EP1013808A1 EP 1013808 A1 EP1013808 A1 EP 1013808A1 EP 99125835 A EP99125835 A EP 99125835A EP 99125835 A EP99125835 A EP 99125835A EP 1013808 A1 EP1013808 A1 EP 1013808A1
Authority
EP
European Patent Office
Prior art keywords
support
guide element
strap
depression
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.)
Granted
Application number
EP99125835A
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English (en)
French (fr)
Other versions
EP1013808B1 (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
SOMET Societa Meccanica Tessile SpA
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Application filed by SOMET Societa Meccanica Tessile SpA filed Critical SOMET Societa Meccanica Tessile SpA
Publication of EP1013808A1 publication Critical patent/EP1013808A1/de
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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.
  • 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 t'o form guide tracks for gripper straps in a gripper loom, of the type comprising at least a horizontal sliding surface for the strap, projecting like a bracket from the body of the support and guide element, characterized in that said horizontal sliding surface for the strap comprises a central depression.
  • 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 a first 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;
  • Fig. 5 shows three views - an axonometric view, a side elevation and a plan view, respectively - similar to those of figs. 2, 3 and 4, of a different embodiment of the lower support and guide element according to the present invention
  • Fig. 6 shows three views, similar to those of fig. 5, of an upper support and guide element according to the embodiment of the invention illustrated in fig. 5.
  • 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 a first 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 O 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.
  • Fig. 5 illustrates a second embodiment of the invention, of simpler construction, wherein the depression 1 has a V-shaped configuration and its radiusing edges to the surfaces 2 and 3 consist of segments perpendicular to the plane of symmetry of the support and guide element G (indicated in fig. 4 by the dashed line a ) and do not have the arched buttresses with vertical walls described with reference to the first embodiment of said support and guide element G.
  • the first 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 O - in the event they should be pulled by the gripper - from bearing onto said surface 3.
  • the warp yarns O behave as described heretofore both in correspondence of the lower support and guide elements Gi - shown in figs. 2 to 5 - 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 two embodiments of the lower bracket elements Gi and, for the sake of simplicity, are illustrated in fig. 6 merely with reference to the second embodiment of the invention.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Treatment Of Fiber Materials (AREA)
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
ITMI982808 1998-12-23
IT1998MI002808A IT1303652B1 (it) 1998-12-23 1998-12-23 Gancino per piste di guida dei nastri delle pinze in un telaio ditessitura a pinze

Publications (2)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049254A1 (de) * 2004-10-05 2006-04-06 Picanol N.V. Greifertransportelement für eine Webmaschine
DE102004049256A1 (de) * 2004-10-05 2006-04-06 Picanol N.V. Führungselemente für ein Greifertransportelement einer Webmaschine
DE102004049255A1 (de) * 2004-10-05 2006-04-06 Picanol N.V. Führungselemente für ein Greifertransportelement einer Webmaschine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1397230A (fr) * 1964-01-17 1965-04-30 Perfectionnements aux machines à tisser à alimentation continue en trame
US3842869A (en) * 1973-10-09 1974-10-22 Rockwell International Corp Tapeguide raceway for rapier loom
FR2270356A1 (de) * 1972-03-04 1975-12-05 Desveus Duran Magin
EP0137376A2 (de) * 1983-10-10 1985-04-17 VAMATEX S.p.A. Vorrichtung zum Führen der schussfadentragenden Greifer in das Webfach einer Webmaschine
EP0275479A1 (de) * 1986-12-23 1988-07-27 VAMATEX S.p.A. Mittel zum Führen der Greiferbewegung im Fach von Webmaschinen
DE29506561U1 (de) * 1995-04-18 1995-06-08 Textilma Ag Webmaschine
EP0709505A1 (de) * 1994-10-27 1996-05-01 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Führungsbahn für Greiferbanden in Webmaschinen
GB2314095A (en) * 1996-06-14 1997-12-17 Griffith Textile Mach Ltd Gripper Axminster type loom

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1397230A (fr) * 1964-01-17 1965-04-30 Perfectionnements aux machines à tisser à alimentation continue en trame
FR2270356A1 (de) * 1972-03-04 1975-12-05 Desveus Duran Magin
US3842869A (en) * 1973-10-09 1974-10-22 Rockwell International Corp Tapeguide raceway for rapier loom
EP0137376A2 (de) * 1983-10-10 1985-04-17 VAMATEX S.p.A. Vorrichtung zum Führen der schussfadentragenden Greifer in das Webfach einer Webmaschine
EP0275479A1 (de) * 1986-12-23 1988-07-27 VAMATEX S.p.A. Mittel zum Führen der Greiferbewegung im Fach von Webmaschinen
EP0709505A1 (de) * 1994-10-27 1996-05-01 SOMET SOCIETA' MECCANICA TESSILE S.p.A. Führungsbahn für Greiferbanden in Webmaschinen
DE29506561U1 (de) * 1995-04-18 1995-06-08 Textilma Ag Webmaschine
GB2314095A (en) * 1996-06-14 1997-12-17 Griffith Textile Mach Ltd Gripper Axminster type loom

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049254A1 (de) * 2004-10-05 2006-04-06 Picanol N.V. Greifertransportelement für eine Webmaschine
DE102004049256A1 (de) * 2004-10-05 2006-04-06 Picanol N.V. Führungselemente für ein Greifertransportelement einer Webmaschine
DE102004049255A1 (de) * 2004-10-05 2006-04-06 Picanol N.V. Führungselemente für ein Greifertransportelement einer Webmaschine
DE102004049255B4 (de) * 2004-10-05 2013-07-18 Picanol Führungselemente für ein Greifertransportelement einer Webmaschine
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

Also Published As

Publication number Publication date
ITMI982808A1 (it) 2000-06-23
ATE266754T1 (de) 2004-05-15
DE69917197D1 (de) 2004-06-17
IT1303652B1 (it) 2001-02-21
DE69917197T2 (de) 2005-05-19
ES2221295T3 (es) 2004-12-16
EP1013808B1 (de) 2004-05-12

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