Weaving Installation

Abstract

Weaving Installation (10) comprising: - a plurality of harrows, each supporting several bobbins of warp yarn, - a loom located downstream of the plurality of harrows along a weaving direction (Dt), the loom comprising a harness (30) in which the warp yarns are arranged in a plurality of parallel layers and columns, - a warp board (10) located between the plurality of harrows and the harness (30), said warp board (10) comprising a plurality of eyelets, each eyelet being traversed by a warp yarn from a bobbin of one harrow of the plurality of harrows. The warp yarn warp board (10) has an arc-shaped form, the arc being inscribed in a circle (C) whose center (O) is located between said warp yarn warp board (10) and the harness (30). Figure for the abbreviation: Fig. 1.

Description

Title of the invention: Weaving installation technical field

[0001] The present invention relates to a three-dimensional weaving installation for fibrous structures, in particular enabling the weaving of large structures. Prior art

[0002] A three-dimensional weaving installation for fibrous structures typically includes a Jacquard-type loom whose harness has control or heddle wires and warp wires arranged in a plurality of parallel layers and columns, such as that described in document FR 3 074 195 A1, a rack where the warp wire bobbins are arranged in a set of creels, and a warp wire condensation board.

[0003] The warp condensing board is positioned between a rack containing the heddles and the harness. This board gathers all the warp threads from the heddles into a compact unit upstream of the loom. Typically, the warp condensing board is a flat board with holes, called eyelets, through which the warp threads pass.

[0004] Since the width of the fibrous structure to be woven is related to the number of warp threads, it determines the gap between the warp threads in the grating, that is, its width. The greater the gap between the warp threads in the grating, the greater the friction of some warp threads on the walls of the gratings they pass through. For an installation with a grating positioned at a specific distance from the warp thread condensation board, there is therefore a maximum width of fibrous structure to be woven beyond which the friction of the warp threads as they pass over the condensation board causes damage or even breakage.

[0005] It would therefore be desirable to have a solution allowing the weaving of large fibrous structures while ensuring guidance of the warp threads from the creels to the harness without damage or breakage of the latter. Description of the invention

[0006] To this end, the present invention proposes a weaving installation comprising: - a plurality of canters each supporting several bobbins of warp yarn, - a loom located downstream of the plurality of canters in a weaving direction, the loom comprising a harness in which the warp yarns are arranged in a plurality of layers and columns parallel to each other, - a condensation board present between the plurality of canters and the harness, said condensation board comprising a plurality of eyelets, each eyelet being crossed by a warp thread from a bobbin of a canter of the plurality of canters, characterized in that the condensation board of the warp threads has an arc-shaped form, the arc-shaped form being inscribed in a circle whose center is located between said condensation board of the warp threads and the harness.

[0007] The circular geometry of the warp thread condensation board minimizes friction between the warp threads and the walls of the eyelets located at the ends of the board. Such a warp thread condensation board thus significantly reduces the width of the warp thread bundle from the creels. The number of warp threads used for weaving can therefore be increased, particularly in width, without risk of damage to said threads. Thus, the invention provides a weaving installation that allows the weaving of wide fibrous structures while ensuring that the warp threads from the creels are guided to the harness without damage or breakage.

[0008] According to a particular feature of the weaving installation, the condensation board comprises a plurality of adjacent flat sections, each flat section of the plurality of flat sections receiving warp yarns from at least one creel of the plurality of creels at a defined angle of incidence with respect to the normal to the surface of the flat section, the angle of incidence being less than 5°.

[0009] This allows for low friction of the warp threads on the edges of the eyelets. Indeed, the friction force exerted by a warp thread on the eyelet wall is minimal when the warp thread arrives in a direction normal to the plane of the eyelet.

[0010] According to another particular feature of the weaving installation, the distance separating the condensation board from the harness and the distance separating said condensation board from the plurality of creels are between 2,000 mm and 45,000 mm.

[0011] This allows for a satisfactory weaving tension on the warp yarns without applying too much tensile stress to them which could damage the warp yarns.

[0012] According to another particular feature of the weaving installation, the circle in which the warp yarn condensation board is inscribed has a diameter between 1520 mm and 2520 mm.

[0013] This ensures an angle of incidence of the warp threads on the condensation board that is less than an angle beyond which the warp threads would be damaged by friction as they pass through the eyelets of the board. condensation. In addition, this ensures an acceptable deviation of the warp threads from the weaving direction at the exit of the condensation board.

[0014] According to another particular feature of the weaving installation, the eyelets of the warp yarn condensation board have a coating of a material having a low coefficient of friction, chosen from: ceramic, polyacetal copolymer (POM-C).

[0015] This further minimizes wear on the warp threads as they pass through the eyelets of the condensation board.

[0016] According to another particular feature of the weaving installation, the angle formed by two adjacent flat sections located on the edges of the warp yarn condensation board is less than or equal to 180°.

[0017] This ensures low friction of the warp threads on the edges of the eyelets 1000.

[0018] According to another particular feature of the weaving installation, the angle formed by two adjacent flat sections located in the central part of the warp yarn condensation board is equal to 180°. Brief description of the drawings

[0019] [Fig.1] Fig.1 is a schematic view of the weaving installation according to one embodiment of the invention,

[0020] [Fig.2] Fig.2 is a schematic perspective view of the board condensation of warp threads 10 of [Fig.l],

[0021] [Fig.3] Fig.3 is a schematic perspective view showing the structure from the condensation plate of warp threads 10 of [Fig.2]. [Fig.3] is an enlargement of box II of [Fig.2]. Description of the implementation methods

[0022] The invention is now described by means of figures, which are present for descriptive purposes to illustrate certain embodiments of the invention and which should not be interpreted as limiting the latter.

[0023] Figure 1 schematically illustrates a weaving installation according to one embodiment of the invention. The weaving installation comprises a rack 20, a loom harness 30, and a warp thread condensation board 10. The harness 30 is located downstream of the rack 20 along the weaving direction Dt. The rack 20 comprises heddles 21, 22, 23, 24, each supporting several bobbins of warp threads. In Figure 1, only the warp threads from the ends of each heddle are shown: warp threads 31 and 32 from heddle 21, warp threads 33 and 34 from heddle 22, warp threads 35 and 36 from heddle 23, and the warp threads 37 and 38 coming from the creel 24. The warp threads are for example made of glass or carbon.

[0024] In this description, the warp yarn deflection α corresponds to the angle between the normal direction N30 relative to the plane of the harness 30, this direction coinciding with the weaving direction Dt, and the direction at the entrance of the harness 30 of a warp yarn located at the end of the weaving bundle 31 or 38, the angle α typically being between 0° and 7°. The width of the warp yarn condensation board 10 is limited by the value of the angle α. Too large an angle α results in a progressive separation of the harness by the warp columns as one approaches its edges, which leads to significant friction of the warp yarns at the reed (the component located at the front of the harness for beating the inserted wefts).

[0025] According to the invention, the warp wire condensation board 10 has an arc-shaped circular form, the arc of the circular being inscribed in a circle C whose center O is located between said warp wire condensation board 10 and the harness 30.

[0026] A warp yarn condensation board 1 is shown in [Fig. 1] to illustrate the effect of the curvature of the warp yarn condensation board 10 on the angle of incidence of the warp yarns

[310] . The warp yarn condensation board 1 is not included in the weaving installation according to the present invention. Said board 1 corresponds to the warp yarn condensation board 10 laid flat, its width being equal to the length of the arc of a circle in which the warp yarn condensation board 10 is inscribed.

[0027] The angle of incidence of the warp threads [3i] on the developed condensation board 1 corresponds to the angle between the direction exiting the rack 20 of a warp thread located at the end of the weaving bundle 31 or 38 and the normal direction Ni with respect to the plane of the developed condensation board 1, this direction being coincident with the weaving direction Dt. The angle of incidence of the warp threads |310 on the condensation board 10 corresponds to the angle between the direction exiting the rack 20 of a warp thread located at the end of the weaving bundle 31 or 38 and the normal direction Ni0 with respect to the plane of the eyelet crossed by said warp thread. We observe that, thanks to the arc-shaped condensation board 10, the angle of incidence of the warp threads [3i0 on the condensation board 10 is much less than the angle of incidence of the warp threads [3i on the developed condensation board 1.This significantly reduces the frictional force exerted by the warp threads on the eyelet walls.

[0028] Furthermore, compared with a flat condensation board such as the developed condensation board 1 which is typically used in the prior art, the The warp thread condensation board 10 significantly reduces the width of the warp thread bundle coming from the wefts 21, 22, 23, and 24. The number of warp threads used for weaving can then be increased, particularly in width, without risk of damage to said threads. The weaving installation according to the present invention therefore allows the weaving of wider fibrous structures than in the prior art, while ensuring that the warp threads are guided towards the harness 30 without damage or breakage.

[0029] The distance L1 separating the warp board from the warp threads 10 and the harness 30, and the distance L2 separating said warp board from the warp threads 10 and the creels 21, 22, 23, 24, are determined so as to obtain satisfactory weaving tension on the warp threads without applying excessive tensile stress that could damage them. Furthermore, the distance L1 separating the warp board from the warp threads 10 and the harness 30 is greater than a minimum distance to ensure the permissible angle α.

[0030] For example, the distance L1 separating the condensation board from the warp threads 10 of the harness 30 and the distance L2 separating said condensation board from the warp threads 10 from the creels 21, 22, 23, 24, are determined so as to define a cumulative length L1+L2 between 2,000 mm and 45,000 mm.

[0031] The diameter of circle C is preferably between 1520 mm and 2520 mm.

[0032] By way of non-limiting example, a weaving installation according to the invention comprising a warp yarn condensation board 10 inscribed in a circle C of diameter of 2020 mm with a cumulative length L1+L2 of the distance L1 separating the warp yarn condensation board from the harness and the distance L2 separating said warp yarn condensation board from the creels 21, 22, 23, 24, between 2,000 mm and 45,000 mm allows 6500 yarns to be woven over a width of 890 mm.

[0033] According to a particular feature, the warp thread condensation board 10 comprises adjacent flat sections 11, 12, 13, 14, 15. In the example described here, the flat sections 11 and 15, located at the ends of the warp thread condensation board 10, each receive warp threads from the creels placed at the ends of the rack 20. The flat section 11 receives warp threads from creel 21, including warp thread 31, and the flat section 15 receives warp threads from creel 24, including warp thread 38.The flat sections 12, 13, 14 which are not located at the ends of the warp thread condensation board 10 each receive warp threads from two adjacent creels: the flat section 12 receives warp threads from creels 21 and 22 including warp threads 32 and 33, the flat section 13 receives warp threads from creels 22 and 23 including warp threads 34 and 35, and the flat section 14 receives warp threads from creels 23. and 24, including warp threads 36 and 37. Other configurations for supplying warp threads to flat sections via the cans can of course be considered.

[0034] The flat sections 11, 12, 13, 14, 15 of the warp thread condensation board 10 receive warp threads at an angle of incidence [3i0] less than 5°. This ensures low friction of the warp threads on the edges of the eyelets 1000.

[0035] The angle A formed by two adjacent plane sections is preferably less than or equal to 180°. This ensures low friction of the warp threads on the edges of the eyelets 1000. The angle A formed by two adjacent plane sections located on the edges of the warp thread condensation board 10, such as plane sections 11 and 12 or 14 and 15 in [Fig. 1], is preferably less than 180°. The angle A formed by two adjacent plane sections located in the central part of the warp thread condensation board 10, such as plane sections 12 and 13 or 13 and 14 in [Fig. 1], can be equal to 180°.

[0036] Figure 2 schematically illustrates the warp thread condensation board 10 of the weaving installation shown in Figure 1. The warp thread condensation board 10 is held in position by a support element 50. The warp thread condensation board 10 comprises adjacent flat sections 11, 12, 13, 14, 15 held together by connecting rods 300.

[0037] Figure 3 is an enlargement of Inset II of Figure 2. Figure 3 schematically illustrates the structure of the planar section 13 of the warp yarn condensation board 10 shown in Figure 2. The planar section 13 comprises subsections 131, 132, and 133, each having rows of eyelets 1000 through which the warp yarns pass. Subsections 131, 132, and 133 are fastened to each other by means of connecting elements 200. The planar section 13 is held against the planar sections 12 and 14 by fixing rods 300 and interface connecting elements of the sublayers 400. The structure of the other sections 11, 12, 14, and 15 is identical to that of the planar section 13 just described.

Claims

Demands

1. Weaving installation (10) comprising: - a plurality of harrows each supporting several bobbins of warp yarn, - a loom present downstream of the plurality of harrows along a weaving direction (Dt), the loom comprising a harness (30) in which the warp yarns are arranged in a plurality of layers and columns parallel to each other, - a condensation board (10) present between the plurality of harrows and the harness (30), said condensation board (10) comprising a plurality of eyelets (1000), each eyelet being traversed by a warp yarn from a bobbin of a harrow of the plurality of harrows, characterized in that the condensation board of the warp yarns (10) has an arc-shaped form, the arc-shaped form being inscribed in a circle (C) whose center (O) is located between said condensation board of the warp yarns (10) and the harness (30).

2. Weaving installation according to claim 1, wherein the condensation board (10) comprises a plurality of adjacent planar sections, each planar section of the plurality of planar sections receiving warp yarns from at least one creel of the plurality of creels at an angle of incidence ([3i0] defined with respect to the normal (Ni0) to the surface of the planar section, the angle of incidence being less than 5°.

3. Installation according to any one of claims 1 or 2, wherein the distance separating the condensation board from the harness (L1) and the distance separating said condensation board from the plurality of canters (L2) are between 2,000 mm and 45,000 mm.

4. Installation according to claim 3, wherein the circle (C) in which the warp wire condensation board (10) is inscribed has a diameter between 1520 mm and 2520 mm.

5. Installation according to any one of claims 1 to 4, wherein the eyelets (1000) of the warp thread condensation board (10) have a coating of a material having a low coefficient of friction, selected from one of the following materials: ceramic, polyacetal copolymer (POM-C).

6. Installation according to any one of claims 1 to 5, wherein the angle (A) formed by two adjacent plane sections located on the edges of the warp wire condensation board is less than or equal to 180°.

7. Installation according to any one of claims 1 to 6, wherein the angle (A) formed by two adjacent plane sections located in the central part of the warp wire condensation board is equal to 180°.

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