EP3425096A1 - Herstellungsverfahren eines webblattes und mit diesem verfahren hergestelltes webblatt - Google Patents

Herstellungsverfahren eines webblattes und mit diesem verfahren hergestelltes webblatt Download PDF

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Publication number
EP3425096A1
EP3425096A1 EP18177261.7A EP18177261A EP3425096A1 EP 3425096 A1 EP3425096 A1 EP 3425096A1 EP 18177261 A EP18177261 A EP 18177261A EP 3425096 A1 EP3425096 A1 EP 3425096A1
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EP
European Patent Office
Prior art keywords
reed
rods
spacing
yarn
blades
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
EP18177261.7A
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English (en)
French (fr)
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EP3425096B1 (de
Inventor
Matteo Antonio Schoch
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Schoch Matteo Antonio
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Individual
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/60—Construction or operation of slay
    • D03D49/62—Reeds mounted on slay

Definitions

  • the present invention relates to reeds for weaving looms, and more particularly, to a method for manufacturing said reeds.
  • each of the aforementioned rods is currently formed by a pair of opposed metal shaped bars between which the blades of the reed are positioned, said shaped bars having a flat profile at the side in contact with the blades and a rounded profile at the other side (i.e., in practice, a circular segment cross-section), such that, taking into account the spacing imposed by the blades, the assembly of two opposed shaped bars forms a roughly circular cross-section.
  • each pair of adjacent blades there can be alternated not just one coil of spacing yarn, but also two or more adjacent coils; the number of coils and the thickness of the spacing yarn precisely determining the distance between the blades intended to form the dents of the finished reed and therefore their parallelism. This distance should in fact be absolutely accurate, along the length of the reed, so that the resulting fabric be then perfectly regular, i.e., without any weaving marks.
  • the reed blades should be arranged with their depth direction perpendicular to the axes of the rods; however, considering that, as stated above, the shaped bars forming the rods are tightly locked against said blades by the spacing yarn, in order to easily accomplish the insertion of the new blades, these are normally inserted between the pairs of shaped bars in a tilted position, i.e., with their depth side suitably tilted, for example at ⁇ 45°, or even parallel to the shaped bars in case of shaped bars for air looms, and then rotated at the angle required to arrange said depth side in its final inclination, i.e., perpendicular to the shaped bars and parallel to the predefined blade lying plane, before pushing and tightening them against the previously assembled blades or, more precisely, against the spacing yarn coils wound on the last assembled blade, in the reed being formed.
  • This blade assembling process starts at one end of the rods and continues, one blade after the other and always alternating the blades with the coils of spacing yarn, up to the opposite end of the rods.
  • these rods are each comprised of two pairs of shaped bars, which thus have, already at the beginning of the process, the desired final length of the reed (therefore even up to 4-6 meters) .
  • the rods are naturally arranged parallel, appropriately locked to a supporting structure at their opposite ends, and mutually spaced apart by a distance substantially corresponding to the desired height of the finished reed.
  • the reed is usually assembled, for greater operating convenience, with the two rods being arranged in a horizontal plane so that the new blades inserted rest on the shaped bars below, in a stable equilibrium position.
  • the underlying problem of the invention is therefore to provide a new blade assembly method for forming a reed structure for weaving looms, and a new reed structure thus obtained, which overcome the aforementioned drawbacks.
  • a main object of the invention is to provide a method for manufacturing loom reeds in which any residual stresses on the blades are completely eliminated.
  • Another important object of the invention is to provide a method for manufacturing loom reeds that allows for achieving a very precise blade parallelism, along the whole extension of the blades, independently of the thickness, and then of the stiffness, of the blades and of the height of the reed.
  • a further object of the present invention is to provide a method for manufacturing loom reeds in which the main steps of blade insertion and spacing yarn positioning may overlap at least in part, so as to achieve greater continuity of the manufacturing method and therefore greater productivity thereof.
  • Still another important object of the present invention is to achieve a constant quality of the end product, independently of the experience of the manpower employed in its manufacture.
  • Figures 1 and 2 show two reeds of the prior art, with rectilinear blades ( Figure 1 ) for gripper-, projectile- and water-looms, and shaped blades ( Fig. 2 ) for air looms, respectively.
  • the group of blades L is clearly visible, which blades are retained at their lower and upper ends by rods C; the structure of each of these rods - well known in the art and not further shown here - comprises coupling of two opposed shaped bars upon the two sides of the reed.
  • the basic principle of the method for manufacturing a reed for weaving looms according to the invention consists in using, as a spacing member, at least a length of a spacing yarn, running across the blade height and being positioned against the lateral surface of the blade, in a wavy configuration lying in a plane parallel to the lying plane of said blades.
  • the term "wavy configuration", referred to the shape of the length of spacing yarn, should be understood herein to comprise any type of sinusoidal, zig-zag, fret-shape, or any other, even irregular shape allowing the length of spacing yarn to cross each blade several times, possibly protruding from its opposite edges, in different points of the same blade, thus creating a much more stable scattered support for the blades, even when these, due to their reduced thickness, are characterized by a high flexibility.
  • the above described support structure comprising a continuous spacing yarn wound as a spiral on two rods C intended to be permanently incorporated in the reed is in fact abandoned.
  • a temporary support structure wherein the reciprocal spacing of the blades, in order to form gaps S for the passage of the warp yarns having a perfectly constant width, is obtained by means of single lengths of spacing yarn having a suitable gauge.
  • Said spacing yarn is of the same type already in use in the known manufacturing methods and, as already mentioned above, is formed according to a wavy configuration, then laid and tightened on the lateral surface of blades L to make up the spacing member between two successive blades, and finally removed when the manufacturing of the reed is completed.
  • Said temporary support structure should therefore simply apt to impart stability and compactness to the reed being formed - consisting of the set of blades L and the lengths of spacing yarn F interposed therebetween - during the reed assembly steps and the subsequent locking of the opposed blade ends into U-section crosspieces T by means of an impregnation resin, and therefore is not particularly limited.
  • this temporary structure comprises a plurality of rods, e.g. at least three rods, each consisting - instead of a pair of opposed shaped bars as in the prior art - of a single shaped bar.
  • the optimum number of rods is determined according to the thickness of the blades and the height of the reed. Said rods are all arranged either on the same side of the reed or in an alternate manner, on both sides of the blades, as will be better described below.
  • the individual shaped bars forming said rods may have a circular segment cross-section - as in the prior art - or any other convenient section, for example a semicircular, or an elliptical or a perfectly circular cross-section as illustrated by way of example in the drawings.
  • a semicircular, or an elliptical or a perfectly circular cross-section as illustrated by way of example in the drawings.
  • these shaped bars are intended to perform their function autonomously, i.e. without direct cooperation with an opposed shaped bar and are also intended to be removed at the end of processing, as will be better explained below, their cross-section shape is not particularly critical.
  • any other embodiment of the temporary support structure - which includes for example trays, bars, or other shaped sections, optionally coupled to magnetic means - provided that this temporary structure is apt to keep the blades L and the interposed lengths of spacing yarn F adjacent and mutually tightened during the reed assembly process and the final locking step thereof. It must therefore be understood that anyone of such temporary locking structures of this type, regardless of its nature and configuration, is included within the protection scope of the present invention.
  • the temporary support structure comprises five parallel rods 2, alternately arranged along the height of reed 1 being formed, on one side and on the opposite side thereof, and preferably at the same reciprocal distance.
  • Figure 3 shows schematically, in a front view and in an enlarged scale for a better understanding, a portion of a weaving loom reed being formed, in which blades L, separated by empty gaps S - each intended for the passage of one or more warp yarns - whose width is determined, according to the invention, by the insertion of a length of spacing yarn F (not shown in Fig. 3 for clarity).
  • rods 2 are positioned alternately on one side and on the other side of blades L, respectively, as can be seen more clearly in Fig. 4 , which shows a side view of the reed being formed.
  • the Applicant has in fact supposed that the blade residual stresses frequently arising in the reeds of the prior art, be essentially due to a not perfectly balanced compression action that the spacing yarn coils can apply on the individual blades, in the area in which said coils cross over the blades, and therefore that, by completely eliminating this cross over area - thanks to the fact that the spacing yarn is used in the form of different and mutually independent lengths - it would be possible to root out the problem related to blade residual stresses and, at the same time, lay the basis for an improved reed assembly method that would achieve all the desired objects.
  • the spacing yarn F forms in fact a plurality of "mutual spacing" points of the blades F1, F2, F3, F4, F5, and F6 where the branches of spacing yarn F in a wavy configuration pass from one side of blades L to the other, offering a stable and scattered support, particularly effective in assuring a perfect blade parallelism even when operating with blade having an extremely reduced thickness.
  • the initial deformation of the lengths of spacing yarn F is preferably achieved by means of a bending apparatus for yarn F placed in proximity of rods 2 and comprising movable fingers which can be mutually inserted between fixed abutments and a feeding reel for spacing yarn F.
  • a movable gripper grips the free end of the yarn and brings it into the working area of the movable fingers.
  • the movable fingers advance in succession, in a direction perpendicular to spacing yarn F, each inserting between two adjacent fixed abutments, so as to progressively deform the yarn F with a series of loops, withdrawing the additional required yarn F from the feeding reel.
  • a fixed gripper grips the yarn in proximity of the feeding reel and a cutting device pull apart yarn F from the reel, thus creating the desired length of spacing yarn in a wavy configuration, which can thus be inserted on rods 2.
  • the number n of movable fingers is equal to the number n of desired loops to be formed on spacing yarn F, while the number of fixed abutments is equal to n + 1, considering however that one or both fixed end abutments may be replaced, in their function, by said mobile and fixed gripper.
  • the movable fingers may operate either by thrust or by traction, preferably by means of a particular conformation of the tip or by means of a gripping member transversely protruding from said tip and suitable for hooking spacing yarn F. Particular preferred conformations of the bending of each loop may be obtained simply by modifying the shape of the movable fingers, of their gripping members, or of the fixed abutments.
  • the final result of the operations described in the aforesaid embodiments A, B, and C of the method for manufacturing a reed of the invention is therefore the formation of a length of spacing yarn F having a desired wavy conformation comprising a plurality of loops, suitable to be coupled to the rods 2 arranged either on one side only of the reed being formed, or in an alternating and offset position on both sides of the reed being formed. Therefore, once spacing yarn F has assumed this wavy conformation, in whatever position it was thus formed, it is slid along rods 2 to the necessary extent - through an abutting member, known per se - until it comes into contact with the blade L last inserted on the reed being formed.
  • each length of spacing yarn F thus shaped is intended to be simply laid on the side surface of a blade L, upon which it is then tightened when the next blade is inserted.
  • rods 2 are in an alternating arrangement on the two sides of the reed, to apply a moderate pulling force on the two ends of spacing yarns F, by means of a dual gripper traction device, in order to bring said spacing yarn F in close contact with rods 2 and then to bend the two ends of said yarn around external rods 2 to the desired extent.
  • this arrangement which comprises several rods 2 arranged alternately, on one side and on the other side of blades L, respectively, and lengths of spacing yarn F in a wavy configuration between said rods 2, the blades L are held in the correct position, as a result of the pressure exerted on their edges by rods 2, just as well as with the rods with opposed shaped bar pairs of the prior art.
  • a longitudinal cut of spacing yarns F may be made at the back of one or more of said rods. It is also preferable to arrange the outermost rods 2 in a slightly more internal position than the usual position of the rods of the prior art, so as to prevent such rods and the spacing yarns F resting thereon from being affected by resin impregnation in the U-section and to allow for easy removal thereof.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP18177261.7A 2017-07-06 2018-06-12 Herstellungsverfahren eines webblattes und mit diesem verfahren hergestelltes webblatt Active EP3425096B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000076151A IT201700076151A1 (it) 2017-07-06 2017-07-06 Metodo di fabbricazione di un pettine per telai di tessitura e pettine ottenuto con tale metodo

Publications (2)

Publication Number Publication Date
EP3425096A1 true EP3425096A1 (de) 2019-01-09
EP3425096B1 EP3425096B1 (de) 2022-04-27

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EP18177261.7A Active EP3425096B1 (de) 2017-07-06 2018-06-12 Herstellungsverfahren eines webblattes und mit diesem verfahren hergestelltes webblatt

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EP (1) EP3425096B1 (de)
IT (1) IT201700076151A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023025478A1 (de) 2021-08-27 2023-03-02 Groz-Beckert Kg Webblatt und verfahren zur herstellung eines webblatts
DE102021122217A1 (de) 2021-08-27 2023-03-02 Groz-Beckert Kommanditgesellschaft Webblatt und Verfahren zur Herstellung eines Webblatts
DE102021122220A1 (de) 2021-08-27 2023-03-02 Groz-Beckert Kommanditgesellschaft Webblatt und Verfahren zur Herstellung eines Webblatts

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048001A (en) * 1934-05-25 1936-07-21 Myron C Fish Method of manufacturing loom reeds
US2234408A (en) * 1939-09-25 1941-03-11 Excelsior Loom Reed Works Inc Loom reed
US2544882A (en) * 1947-02-12 1951-03-13 Excelsior Loom Reed Works Inc Loom reed
FR2013470A1 (de) * 1968-07-22 1970-04-03 Spaleck Max Gmbh
EP0684328A1 (de) * 1994-05-27 1995-11-29 NUOVO PIGNONE S.p.A. Verbessertes Führungssystem für den Greifereintragsband in eine schützenlose Webmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2048001A (en) * 1934-05-25 1936-07-21 Myron C Fish Method of manufacturing loom reeds
US2234408A (en) * 1939-09-25 1941-03-11 Excelsior Loom Reed Works Inc Loom reed
US2544882A (en) * 1947-02-12 1951-03-13 Excelsior Loom Reed Works Inc Loom reed
FR2013470A1 (de) * 1968-07-22 1970-04-03 Spaleck Max Gmbh
EP0684328A1 (de) * 1994-05-27 1995-11-29 NUOVO PIGNONE S.p.A. Verbessertes Führungssystem für den Greifereintragsband in eine schützenlose Webmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023025478A1 (de) 2021-08-27 2023-03-02 Groz-Beckert Kg Webblatt und verfahren zur herstellung eines webblatts
WO2023025479A1 (de) 2021-08-27 2023-03-02 Groz-Beckert Kg Webblatt und verfahren zur herstellung eines webblatts
DE102021122217A1 (de) 2021-08-27 2023-03-02 Groz-Beckert Kommanditgesellschaft Webblatt und Verfahren zur Herstellung eines Webblatts
DE102021122220A1 (de) 2021-08-27 2023-03-02 Groz-Beckert Kommanditgesellschaft Webblatt und Verfahren zur Herstellung eines Webblatts

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Publication number Publication date
EP3425096B1 (de) 2022-04-27
IT201700076151A1 (it) 2019-01-06

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