EP0145615B2 - Process for manufacturing woven tapes with localized tightened parts woven on an automatic sickle loom and device for carrying out this process - Google Patents

Abstract

The invention concerns woven straps having transverse contractions, as well as a method and apparatus for their manufacture. Contractions are formed along straps having a continuous unchanging weave and continuous selvedge by altering spacing of warp yarns during weaving. The warp yarns are spaced by a V or fan shaped support which is vertically movable to cause corresponding width variations in the straps.

Description

Woven straps with localized transverse narrowing obtained on automatic sickle looms, their manufacturing process and means of implementing the process.

The invention relates to straps with locally transverse constrictions arranged over variable lengths intended to ensure positioning of said straps in a fixing means such as a mooring loop.

These straps are obtained on shuttle looms, either by means of a change in texture occurring at the level of the narrowing, or by eliminating warp threads, or by exerting a tension force on the weft thread in order to ensure transverse approximation. warp threads, or again using special combs. One can for example quote the patent FR 1.395.815 which teaches the realization of a fabric with narrowing on a loom with shuttles, in particular for the execution of ties.

The straps obtained on the shuttle loom have irregularities in presentation, flexibility and thickness, particularly in the face of shrinkage. In addition, their cost price is high due to a low yield resulting from the low speed at which this type of profession works.

To overcome these drawbacks, it appeared necessary to produce woven straps with localized narrowing, on automatic sickle looms whose production rate is very high. It is known to produce, on this type of trade, straight straps, without shrinking, as is apparent from patent FR 1,249,099.

In order to be able to execute this kind of article on automatic sickle looms, it was necessary to solve important technical problems which did not arise in a shuttle loom. For example, it is essential to keep the distance between the end blade of the comb and the needle constant in order to obtain the continuity of formation of the chain in line with the straight edges of normal or reduced width, and flared connecting edges.

Such a problem does not exist in a sailing loom where the comb is simply driven in a vertical reciprocating movement from bottom to top.

Machines have also been proposed in the form of automatic sickle looms, making it possible to obtain woven straps with narrowing. Mention may be made, for example, of machines of the NFRQ type from the company Jakob Müller AG Maschinenfabrik. This type of machine makes it possible to obtain a woven strap with localized transverse narrowing, having along its length, different weaves with common selvedges for the rectilinear and narrowed parts, said selvedges being obtained on one side, by a succession of chains. with filler wires and, on the opposite side, by the simple return of the weft, in relation to the warp wires.

The object of the invention was set, in a simple, efficient and rational manner, the development of a new manufacturing process for the production of straps with transverse narrowing on automatic sickle looms.

To solve such a problem, according to the invention, a V-shaped comb is inclined relative to the axis of the leaf of the loom, so that the end blade of the comb forms an angle (a) relative to the axis. of said leaf so that said blade always remains at a constant distance parallel to the selvedge formation needle when the comb moves in height to allow the weaving of the narrowed parts and the connecting parts.

It should be noted, in known manner, that the displacement of the V-shaped comb is controlled, on the one hand, with a weft-giving device to ensure the variation of the running speed, taking into account the lesser width of tension of the strap and, on the other hand, with a strap tension regulating device for its call and evacuation, taking into account the striking force of the leaf acting on a lesser width of the strap.

For the implementation of the method, the leaf of the sickle loom receives a vertical slide, fixed angularly, in an oblique manner being shaped to receive a movable slide intended for the mounting of a comb with blades arranged symmetrically in the form of V to obtain, according to its positioning in height, the variation of the spacing of the warp threads; the end blade of said comb being inclined along a plane parallel to the working plane of the needle used to form the chain stitches of the edge of the strap so as to obtain the continuity of the edge during weaving, the narrowed parts; the displacement in height of the movable comb-carrying slide is ensured by a jack fixed on the leaf or on a fixed part of the loom; said piston being controlled according to a stroke determined by the pulses of a sensor arranged opposite the axis of the leaf or any other moving member; the weft donor device is controlled by a speed variator coupled to the comb control system; said device authorizing the slowing down of the linear speed of the weft distributor, when weaving narrowed widths or flares.

The tensioning device of the strap after weaving is controlled by a speed variator coupled to the comb control system; said device authorizing, by the speed variation, the call and the evacuation of the strap with a pulling effect during the weaving of the narrowed widths or flares.

The pulses from the sensor are transmitted to an electronic box fitted with counters, which distributes said pulses simultaneously to the detection device. placement of the movable comb-carrying slide to the weft-giving device and to the strap tension regulating device.

• - la régularité de tissage, de souplesse et d'épaisseur de la sangle, notamment au droit des rétrécissements,
• - la rapidité de fabrication avec une ou plusieurs armures quels que soient les types d'armures.
• - la possibilité d'obtention sur un même métier, des sangles avec des rétrécissements de largeurs variables et des évasements progressifs de longueurs variables.

The advantages obtained thanks to this invention essentially lie in:

• - the regularity of weaving, flexibility and thickness of the strap, in particular at the right of the narrowing,
• - the speed of manufacture with one or more armor whatever the types of armor.
• - the possibility of obtaining on the same loom, straps with narrowing of variable widths and progressive flares of variable lengths.

• La figure 1 est une vue en perspective d'un métier automatique au droit de la faucille, équipé du dispositif selon l'invention en vue de la réalisation de sangles tissées avec parties resserrées.
• Les figures 2, 3, 4, 5 et 6 illustrent différents types de sangles obtenues selon l'invention.
• La figure 7 est une vue de face illustrant la fixation du peigne sur le coulisseau et son positionnement par rapport à l'aiguille de tricotage. Le peigne occupant une position basse (tissage partie large de la sangle).
• La figure 8 est une vue en plan et en coupe suivant la ligne 8-8 de la figure 7.
• La figure 9 est une vue de face semblable à la figure 7, mais le peigne occupe la position haute (tissage partie étroite de la sangle).
• La figure 10 est une vue extérieure de profil correspondant à la figure 9.
• La figure 11 est une vue purement schématique illustrant la commande synchronisée, à partir du capteur, de déplacement du peigne, du donneur de trame et du tambour d'enroulement de la sangle.

The invention is set out below in more detail with the aid of the drawings showing only one embodiment.

• Figure 1 is a perspective view of an automatic loom to the sickle right, equipped with the device according to the invention for the production of woven straps with tightened parts.
• Figures 2, 3, 4, 5 and 6 illustrate different types of straps obtained according to the invention.
• Figure 7 is a front view illustrating the fixing of the comb on the slide and its positioning relative to the knitting needle. The comb occupies a low position (weaving wide part of the strap).
• FIG. 8 is a plan view and in section along line 8-8 of FIG. 7.
• Figure 9 is a front view similar to Figure 7, but the comb occupies the high position (weaving narrow part of the strap).
• FIG. 10 is an external profile view corresponding to FIG. 9.
• FIG. 11 is a purely schematic view illustrating the synchronized control, from the sensor, of displacement of the comb, of the weft donor and of the drum for winding the strap.

According to the invention, the automatic sickle loom is equipped for obtaining straps with localized transverse constrictions, a slide (1) fixed angularly on the base of the leaf (B) so as to occupy an inclined position, as illustrated in Figures 7 and 9 of the drawings.

By virtue of its profiled section, in dovetail, the slide (1) authorizes the free sliding guidance of a comb-carrying slide (2) in the shape of a stirrup whose trapezoidal cut-out allows the free passage of the web of warp threads (F) biased in the known manner, by the sickle (3) for feeding the weft thread (T).

The slide (2) allows the right of its opening the facial attachment of a comb (4) whose blades (4a) are arranged symmetrically in the shape of a V, so as to obtain between said blades, a maximum spacing at the right of the large base, and on the contrary a minimum spacing to the right of the small base.

Therefore, it is understood that the displacement in height of the slide (2) makes it possible to distance or bring together the warp threads (F) to obtain either the normal width of the strap, or the reduced width with progressive flaring of connection of these two parts.

It is important to consider that the angular fixing in an inclined manner of the slide (1) and consequently of the slide (2) authorizes the rigorous positioning of the extreme blade (4b) of the comb (4) in a plane parallel to the plane movement of the movable needle (5) used to form the chain stitches of the edge of the strap. This characteristic makes it possible, during the stroke in height of the slide (2), to obtain on one side the continuity of formation of the chain at the right of the rectilinear selvedges of normal or reduced width and flared selvedges of connection.

It is also noted that the weft can be linked following several known systems, in particular by the system with one or more filler wires, obtained by the use of the finger (13) inherent in the automatic sickle loom.

The means of displacement in height in both directions of the comb-carrying slide (2) is provided, for example, by means of a jack (6) fixed on the leaf (B) of the loom, or even on a fixed part, the piston of which is connected to said slide (2) either by pneumatic means or by mechanical means. The piston of said cylinder (6) is controlled automatically by means of each pulse from a sensor (7) arranged opposite a mobile member of the trade such as the wing (B), following a stroke of determined and adjustable length. . Therefore, the narrowing operation of the strap (S) is progressive, to obtain at will, on the one hand, flares (Sa - Sb) of connection of variable lengths and, on the other hand, widths narrowed (1a-1b) of variable dimensions, taking into account the amplitude of the stroke of the comb (4). These arrangements are illustrated in Figures 2, 3, 4, 5 and 6 where we see straps (S) of the same width (1) obtained directly on the sickle loom with areas of narrowing and flares of variable dimensions. We also note, according to Figure 5, that the narrowed part (1c) of the strap (S) has a straight and contained selvedge, made either on the chain stitch side, or on the real selvedge side.

It should also be noted that the pulses of the sensor (7) are transmitted to an electronic unit (8) provided with counters, which distributes said necessary pulses, simultaneously by means of displacement in height of the comb, to a weft donor (10) and to a woven strap draft regulator as illustrated in Figure 11.

The weft donor device is slaved to a speed variator (9) coupled to the control (6) of the comb (4) via the electronic unit (8), to act on a weft distributor (10). The weft donor (10) (T) thus automatically allows the proportional slowing down of the distribution during the weaving of the narrowed widths (1 a-1 b) and the flares (Sa - Sb), to avoid fluttering and loosening of the voltage. This distributor (10) can be of any known type, such as close conical flanges, according to FIG. 11, or else of the semi positive type.

The tension regulator acting on the receiving roller (12) of the strap (S) is controlled by a variable speed drive (11) also coupled to the comb control system (4) Via the electronic control unit (8). This results in a greater proportional force during the weaving of the narrowed parts (1a-1 b) and the flares (Sa-Sb), to compensate for the greater striking force of the leaf (B) since it is exerted on a lesser width.

It is obvious that the provisions may possibly apply to ribbons or other similar articles on any type of automatic loom.

It should also be considered that for the understanding of the drawings, the chain stitch side has been illustrated with a serrated edge effect, it being observed that in reality this edge gives a rectilinear effect like the edge on the real selvedge side.

Claims (4)

1. Process to produce woven straps with localised transversal narrower parts, obtained on automatic looms with sickle-shaped needles and having an identical weave throughout the length, with common selvedges along the rectilinear and narrower parts, the said selvedges being obtained, on one side, by a succession of chains formed by the loom needle, with or without additional threads, regardless of the weft binding, and on the other side, by the simple return of the weft with respect to the warp threads, by means of a v-shaped reed, whose movement is servocon- trolled, firstly with a weft feeder to vary the thread speed, taking the smaller width of the strap into consideration, and, secondly, with a strap tension regulating device provided to take up the strap and discharge it, taking the beating load of the slay applied to a smaller width of the strap into consideration, wherein the v-shaped reed is tilted with respect to the shaft of the loom slay, so that the end blade (4b) of the reed forms an angle (a) with respect to the shaft of the slay so that the said blade always stays at a constant parallel distance from the selvedge needle during the reciprocating movement of the reed to allow for the narrower parts and connecting parts to be woven.

2. Means to implement the process according to claim 1, wherein the slay (B) of the sickle-shaped needle loom takes a vertical slideway (1), angularly fixed, in a tilted manner, being designed to take a mobile slider (2) designed for the assembly of a reed (4) with blades (4a) symmetrically arranged in the shape of a V provided, according to its position in height, to vary the distance of the warp threads, the end blade (4b) of the said reed being tilted according to a plane parallel to the working plane of the needle (5) used to form the chain stitches of the strap selvedge so as to ensure the continuity of the selvedge when weaving the narrower parts, the reed holder (4) mobile slider (2) is reciprocated by a cylinder (6) fixed to the slay (B) or a fixed part of the loom, the said piston being actuated according to a stroke determined by the impulses of a sensor (7) arranged in front of the shaft of the slay (B) or any other moving part, the weft feeder (T) is controlled by a variable speed drive (9) coupled to the reed (4) control system, the said drive authorizing the linear speed of the weft feeder (T) to be slowed down when weaving narrower widths (1 a-1 b) or flared parts (Sa-Sb).

3. Implementation means according to claim 2, wherein the device to regulate the tension of the strap (S) after weaving, is controlled by a variable speed drive (11) coupled to the reed (4) control system, the said drive, authorizing, by varying the speed, the take up and discharge (12) of the strap with a pulling effect when weaving narrower widths (1a-1 b) or flared parts (Sa-Sb).

4. Implementation means according to any one of claims 2 and 3, wherein the impulses of the sensor (7) are transmitted to an electronic control box (8) equipped with counters, which simultaneously distributes the said impulses to the reed holder (4) mobile slide (2) movement device, weft feeder (T) and strap tension regulating device (S).

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