WO2016092194A1

WO2016092194A1 - Method for inserting and placing individual wires through a panel

Info

Publication number: WO2016092194A1
Application number: PCT/FR2015/053364
Authority: WO
Inventors: Philippe Doyen; Charles Lestoquoy
Original assignee: Doyen Entreprises
Priority date: 2014-12-10
Filing date: 2015-12-07
Publication date: 2016-06-16
Also published as: FR3029834A1; FR3029834B1

Abstract

The present invention relates to a method for inserting and placing individual wires (Fi1, Fi2) through a panel (P), the individual wires being each provided to project by the free ends thereof from the two sides (C1, C2) of the panel. 10

Description

PROCESS FOR INSERTING AND SETTING INDIVIDUAL YARNS

THROUGH A PANEL

The invention relates to a method for the insertion and placement of individual son through a panel, and a mechanized device for the implementation of the method.

By wire is meant, in particular a textile yarn obtained from spinning, namely the joining of textile fibers to form a long set. The wire may be single-material or multi-material. The materials used may be glass, plastics, metallic materials, or others.

The invention will find particular application in the field of composite materials, more particularly composite sandwiches. A composite sandwich comprises substantially three planar elements, according to its thickness, namely two skins and a core material, intermediate, conventionally in the form of a panel, closely related to the two skins. The core material is conventionally a polyester or polyurethane foam or the like.

The invention relates more particularly to the field of composite sandwiches whose mechanical performance is improved by the addition of fibrous reinforcements in the direction in the thickness of the core.

In such a state of the art, resin is applied to the preform skins / core material: once polymerized, this resin ensures the bonding between the skins / core material interfaces, imprints and coats the textile fibers formed in perforations according to the thickness of the soul, obtaining the fibrous reinforcements.

The state of the art of composite sandwiches knows reinforcement techniques by inserting flexible threads on the skin / soul preform. The known thread insertion techniques are sewing operations through the three materials of the skin / core preform: the fibrous reinforcements of the same line are obtained by the work of the same sewing needle which periodically inserts a thread continuous according to the thickness of the soul and skins. To make the next reinforcement line, the panel is advanced one step and the needle proceeds to a new sewing cycle on an adjacent line. Reinforcement techniques are still known for which the fibrous reinforcements are obtained and inserted by needling techniques. In such a technique, a series of needles provided with barbs makes it possible to drive fibers according to the thickness of the core. Conventionally, the entrained fibers may come from one of the skins, or from a sheet of fibers disposed on one of the two surfaces of the panel.

The main defect in seam reinforcement techniques is their very long implementation due to the needle work, and on the contrary needling reinforcement techniques which are of higher rate. Another defect in seam reinforcement techniques is that they result in tampering of the skins that are pierced by the sewing needle.

Conversely, the main defect of needling techniques is their randomness in that it can not be guaranteed that the barbs of the needles actually cause the fibers: in such a case a quantified presence of fibrous reinforcements in the panel can not be guaranteed, and unlike sewing reinforcement techniques.

In both cases, these techniques have the additional defect of not allowing any distribution of fibrous reinforcements in the core material, or even any inclination of the reinforcements, and because of the techniques and equipment of sewing ( or needling) used to insert these fibrous reinforcements into the core material panel.

The present invention aims to overcome all or part of the aforementioned disadvantages by providing a method for the insertion and placement of individual son, through a panel that ensures the presence of individual son according to the thickness of the panel .

More particularly, the object of the present invention is to provide such a method which can be fully mechanized, and in order to obtain high production yields.

Another object of the present invention, at least according to one embodiment, is to propose such a method allowing a great flexibility of use, and in particular an adjustment of the spatial distribution of the individual wires on the panel, or even preferably an adjustment of the inclinations of the individual son with respect to the plane of the panel.

Thus, at least according to an advantageous embodiment, the position of each of the wire insertions and their inclination at each insertion point can be programmed, allowing custom production by means of robotic and / or automated means.

Also, the invention relates to a method for insertion and placement of individual wires through a panel, the individual wires each being provided protruding by their free ends on both sides of the panel, said method comprising the following steps :

a panel is provided, as well as a longitudinal insertion element having a free end,

a spool of thread is provided and a length section of the thread is unwound, along and in the vicinity of the panel, arranged on a first side of the panel,

the panel is pierced with said insertion element, by the displacement of said insertion element along its longitudinal axis, from said first side of the panel and through the thickness of the panel, and simultaneously the wire is removed by a urging action of said insertion member on the wire at the free end of said member, and until said insertion member and the wire emerge from the second side of the panel and so as to dispose through the perforation of the panel thus created, an upstream and a downstream strand by reference to a loop of the wire emerging from the second side of the panel,

the wire is cut at the upstream end, the first side of the panel, and at the loop of the second side of the panel, obtaining a pair of individual wires through the perforation of the panel, constituted by the upstream and downstream strands .

The process according to the invention advantageously allows:

the insertion of individual threads in a certain manner through panel perforations, and contrary to needling insertion techniques which are random,

independent wire insertions (individual), and unlike sewing insertion techniques for which the different wire insertions of the same line belong to the same continuous wire, constituted by different length sections of this continuous wire. The invention arose from the desire of the present Applicant to mechanically insert individual son according to the thickness of a panel.

Originally, the objective pursued by the present Applicant was to know how to mechanically insert individual son according to the thickness of a panel, and so that each individual wire exceeds by its two free ends, respectively two sides of the panel.

Such mechanized insertion of individual threads is particularly difficult in that there is no known mechanism in the state of the art known to the applicant to provide a solution to this problem.

In the end, the method according to the invention makes it possible to have, in each through-hole created, a pair of such individual wires. It is the merit of the Applicant to have brought a solution to this problem which required inventors for many hours of work and many tests.

According to one embodiment, an element in the form of a blade is chosen for said insertion element, in particular of constant section at least over its useful length intended to perforate the panel. This blade may be a substantially flat element, or may have at least one reinforcing fold, or a curvature, oriented in the longitudinal direction of said insertion element. The blade may further comprise, in combination at least one fold and at least one curvature. The fact of folding and / or bending the blade advantageously makes it possible to stiffen said insertion element, in particular to increase its resistance to bending.

In all cases, whether said insertion element is plane, curved and / or folded, the choice of a blade advantageously makes it possible to create a perforation of small thickness, in the form of a slot, which will make it possible, thanks to the resilience of the panel material, to retain the wire insertion through the friction created, in the perforation, between the material of the panel and the wire insertion.

The panel may be a low density member for use as a core material in a composite sandwich, typically a polyester or polyurethane foam or the like. According to one embodiment, the perforation action of said insertion element is controlled by an actuator such as a pneumatic cylinder, an electric cylinder or a linear motor. In such a case, the actuator stroke is limited, but nevertheless greater than the thickness dimension of the panel and so as to allow said insertion element to enter the panel material, from the first side of the panel and to come out on the other side of the panel. Preferably, a sufficient actuator stroke, superabundant, is chosen and so as to allow inclined insertions, that is to say oriented in directions not perpendicular to the plane of the panel.

According to one embodiment, the unwinding step of a section of wire length is controlled by a motorized roller. A control electronics then makes it possible to drive this motorized roller, and in such a way as to unroll a section of length of wire of determined dimension.

Optionally, this wire length section can be guided and maintained in a guide channel, of direction substantially perpendicular to the axis of the insertion element, positioned just upstream of the insertion element when said element is in retracted position. This channel is intended to be traversed by the insertion element when the latter is moved in the direction of insertion and so as to guarantee the outburst of the wire present in this channel, through a lateral opening of the channel.

Optionally, a guide duct equipped with a venturi system is disposed between the motorized roller and the guide channel, and allows to guide the wire between these two elements.

According to a first embodiment, the thrust action on the wire is provided by the edge of the free end of said insertion element. Optionally the free slice may have a recess for ensuring better grip of the wire.

According to another alternative, said blade has at its free end, an opening and in which the thrust action on the wire is provided, while the length section of the wire through said opening of said insertion member.

The cutting steps of the loop and the upstream strand are advantageously mechanized, by means of suitable cutting devices. According to an advantageous embodiment, the section of the loop emerging from the second side of the panel can be ensured at the end of stroke of said insertion element by said insertion element itself: in such a case said insertion element combines not only a function for perforating the panel, a push element function for the wire, but also a cutting function, at the end of stroke of said insertion element.

Thus and according to this embodiment, said wire cutting step is performed at the level of the loop, on the one hand, by maintaining the upstream and the downstream strand of the first side of the panel in engagement with mechanical means, and on the other hand, by the pushing action of said insertion member and until the free end of said insertion member intersects the loop of the second side of the panel.

According to another embodiment, the section of the wire at the loop can be made by separate cutting means of said insertion element: preferably and in this case is carried out said step of cutting the wire at the loop only once said insertion member removed from said panel.

According to one embodiment, robotic and / or automated means are provided so as to enable:

different positions of said insertion element with respect to the panel,

different inclinations of said insertion element with respect to the plane of the panel, and so as to allow the insertion of a plurality of pairs of individual son according to a spatial distribution of the configurable insertion points and adjustable inclinations.

Thus the robotic and / automated means must allow:

an adjustment of the relative position of said insertion element with respect to the panel, in two (non-parallel) directions of the panel, in "X", and in "Y",

- An adjustment of the relative inclination of said insertion member relative to the plane of the panel, and preferably in two directions perpendicular (non-parallel) to the axis of said insertion member.

Such robotic means advantageously make it possible to parameterize:

the spatial positions in X and Y, of each wire insertion (that is to say of each pair of individual wires) in the plane of the panel and the inclination (according to two degrees of freedom) of each wire insertion relative to the plane of the panel.

The implementation of the method can thus provide for the creation of a digital database comprising for each wire insertion:

the spatial positions in X and Y of the wire insertion, according to the two directions of the panel,

- The inclination of said insertion element (according to two degrees of freedom) relative to the plane of the panel.

According to a first embodiment, the robotic and / or automated means may be a six-axis robot whose robotic arm manipulates the assembly comprising the insertion element and its actuator, said panel then being held in a fixed support. Such an embodiment allows high rates in that said insertion element can be accelerated and braked rapidly from a wire insertion point to the next insertion point.

Alternatively, said insertion member is integral with a frame, fixed, via said actuator, the robotic and / or automated means for manipulating the panel according to different positions and different inclinations of the panel relative to said insertion element and building. Such an alternative is advantageous in that the robot can also be used to manipulate the panel of a loading station, to an unloading station panels. On the other hand, it is likely to produce a lower production rate in that the material of the panel can impose limits of acceleration (positive acceleration) and braking (negative acceleration) and in order not to deteriorate the panel during sudden changes in speed. speed.

The invention also relates to a mechanized device for implementing the method according to the invention, having a self-supporting assembly comprising:

said insertion element, movable along its longitudinal axis with respect to a fixed part of the device,

a channel and wire drive and guide means configured to predispose a wire length section in the channel,

an actuator arranged to move said insertion element along its longitudinal axis in the direction of the thrust through said channel, from a position retracted from said insertion member and to an extended position of said insertion member,

mechanical means comprising a first jaw adapted to maintain said upstream strand, and a second jaw adapted to maintain the downstream strand and to allow cutting of the loop under the free end thrust action said insertion element,

a cutting system of said upstream strand.

The invention also relates to an installation comprising a mechanized device according to the invention and a multi-axis robot, for example a six-axis robot, and in which the self-supporting assembly is carried by the arms of the robot, or alternatively the multi-robot. - Axis allows the manipulation of the panel and the self-supporting assembly is integral with a frame.

The invention will be better understood on the following reading accompanied by the appended drawings among which:

FIGS. 1a to 1b show diagrammatically different steps of the method according to the invention, according to a first embodiment,

FIGS. 2a to 2f show schematically different steps of the method according to the invention, and according to a second embodiment,

FIGS. 3 to 5 represent different possible sections of said insertion element; FIG. 6 represents in perspective, a mechanized device allowing the implementation of the method according to claim 1,

FIG. 7a is a view of the device of FIG. 6, along a plane of section passing through the axis of said insertion element,

Figure 7b is a detail view of Figure 7a.

Also, the invention relates to a method for the insertion and placement of individual son Fil, Fi2 through a panel P, the individual son being each provided with their free ends, on both sides Cl, C2 of panel P, said method comprising the following steps:

a panel P is provided, as well as a longitudinal insertion element I, having a free end Ex,

a coil of wire B is provided and a length section of the wire SL is unfolded, along and in the vicinity of the panel P, arranged on a first side C1 of the panel, the panel P is perforated with said insertion element I, by the displacement of said insertion element I along its longitudinal axis, from said first side C1 of the panel P and through the panel, and simultaneously the wire is removed by a pushing action of said insertion element I on the wire, at the free end Ex of said element, and until said insertion element I and the wire emerge from the second side of the panel C2 and such in order to dispose, through the perforation of the panel thus created, an upstream strand Ba and a downstream strand Bv by reference to a loop Bc of the wire emerging from the second side C2 of the panel,

the wire is cut at the upstream strand Ba, the first side C1 of the panel P, and at the loop Bc of the second side of the panel C2, obtaining a pair of individual wires Fil, Fi2 through the perforation of the panel , constituted by the upstream and downstream strands Ba, Bv.

Such a method is illustrated schematically according to a first embodiment of Figures la to le.

FIG. 1a illustrates the step for which a section of length SL of wire is unwound in the vicinity of the panel, arranged on the first side C1 of the panel. The unwinding step of a section of wire length can be controlled by a motorized roller Gm. A control electronics then makes it possible to drive this motorized roller Gm, and in such a way as to unroll a section of wire length of determined dimension.

FIG. 1b illustrates the beginning of the perforation step of the panel, by the insertion element I, from the first side C1 which simultaneously carries the wire of said section of length SL, through the perforation created. Figure 1c illustrates the end of the piercing step for which the insertion element I and the wire emerge from the second side C2 of the panel. At the end of this step, there is the presence of a loop Bc, an upstream strand Ba and a downstream strand Bv extending respectively through the perforation created, from the loop Bc.

FIG. 1d illustrates the cutting operations, respectively of the loop Bc of the second side C2 of the panel and of the upstream beam Ba, of the first side C1 of the panel P. According to this embodiment, the section of the loop Bc emerging from the second side. C2 of the panel is advantageously provided, at the end of travel of said insertion element I by said insertion element itself: according to this embodiment, said insertion element I combines not only a function for the perforation of the panel, a thrust element function for the wire, but also a cutting function at the end of stroke of said insertion element.

Said thread cutting step is performed at the level of the loop Bc, firstly, by maintaining the upstream strand Ba and the downstream strand Bv of the first side of the panel C1 meshing with mechanical means Me, and secondly by pushing said insertion member I and until the free end of said insertion member I cuts the loop Bc of the second side of the panel P.

As schematically represented by scissors, the section of the upstream strand Ba, at the first side C1 of the panel P can be performed by controlled cutting device.

FIG. 1c, following the section, illustrates the removal of said insertion element I. At the end of the step, a pair of individual wires Fil, Fi2 are obtained through the perforation of the panel, constituted by said upstream strands and downstream Ba, Bv.

Figures 6, 7a and 7b illustrate an embodiment of the mechanized device for implementing the method as previously described in Figures la to le.

This device 1 has a self-supporting assembly comprising:

said insertion element I, movable along its longitudinal axis with respect to a fixed part of the device,

a channel Ca and wire guiding and driving means configured so as to predispose a length section of wire SL in the channel Ca,

an actuator Ac arranged to move said insertion element I along its longitudinal axis in the direction of the thrust through said channel Ca, from a retracted position of said insertion element I and to an extended position of said element of insertion I,

- Mechanical means Me comprising a first jaw Mu, M ₁₂ adapted to maintain said upstream strand Ba, and a second jaw M ₂₁ , M ₂₂ adapted to maintain the downstream strand Bv and to allow the cutting of the loop Bc under the pushing action of the free end Ex of said insertion element,

a cutting system Se of said upstream strand Ba. Such a device works as follows:

Step of Figure la: A motorized roller Gm drive means of the device allows to unwind a section of wire SL through the channel Ca. This channel Ca has a direction substantially perpendicular to the axis of the insertion element I and is positioned just upstream of the insertion element I when said insertion element I is in the retracted position (position illustrated in FIGS. 7a and 7b).

A guide pipe Cg equipped with a venturi system V is disposed between the motorized roller Gm and the channel Ca, and will ensure the guiding of the wire between the channel Ca and the motorized roller Gm.

Steps of FIGS. 1b and 1c: the actuator Ac, for example a pneumatic cylinder, makes it possible to move the insertion element I to the thrust. During this action, said insertion element I, preferably in the form of a blade, passes through the channel Ca, its free end Ex carrying the wire through a lateral opening 01. Said insertion element I is then protruding device and its stroke is sufficient to perforate and pass through the panel material.

Step of Figure ld: from a certain stroke of said actuator Ac, a mechanism of the mechanical means Me causes the closure of the first jaw (Mu jaws against the jaw M ₁₂ ) to maintain the upstream strand Ba, and the closing of the second jaw (jaws M ₂₁ against the jaw M ₂₂ ) coming to maintain the downstream strand Bv. Said insertion element I continues its course and until the free end Ex of said element I cuts the loop in tension. At the same time, starting from a certain stroke of the actuator, a knife Ct of the cutting system Se is driven and passes through the first jaw M _11; M ₁₂ , thus ensuring the cutting of said upstream strand Ba. Note that according to this embodiment, the two jaws (M _11, M ₁₂ and M ₂₁ , M ₂₂ ) can in practice be constituted by the same fixed part forming the jaws Mu and M ₂₁ and of the same moving part. forming the jaws M 12 and M22, this moving part being controlled at the end of stroke displacement of the insertion element I.

Step of Figure 1a: the actuator Ac is then controlled in the opposite direction to allow the removal of said insertion member, and the opening of the first and second jaw. Such an assembly, advantageously self-supporting, can be carried by the arm of a multi-axis robot, for example a six-axis robot.

Such a method as described according to the previous embodiment finds a particular application for flexible son having a limited shear resistance allowing such a mode of cutting the loop by the action of said insert element I.

For flexible yarns having higher shear strength, the embodiment of the method of Figures 2a-2f may be advantageous.

FIG. 2a illustrates the step for which a section of length SL of wire in the vicinity of the panel is arranged, arranged on the first side C1 of the panel. The unwinding step of a section of wire length is controlled by a motorized roller Gm. A control electronics then makes it possible to drive this motorized roller Gm, and in such a way as to unwind a section of length of wire of determined dimension. Typically, the wire section SL passes through an opening O at the free end of said insertion element I.

FIG. 2b illustrates the beginning of the step of perforation of the panel, by the insertion element, from the first side C1 which simultaneously carries the wire of said section of length SL, through the perforation. Figure 2c illustrates the end of the punching step for which the insertion member I and the wire emerge from the second side C2 of the panel. At the end of this step, there is the presence of a loop Bc, and an upstream strand Ba and a downstream strand Bv extending respectively through the perforation created, from the loop Bc.

Figure 2d illustrates the removal of said insertion element. Beforehand, a locking rod Tb is inserted in the loop Bc and in such a way as to allow said insertion element I to be removed, leaving in place the wire insertion (that is to say the upstream strand Ba and the downstream strand Bv). . As shown diagrammatically in FIG. 2e by scissors, once the insertion element I has been removed, one proceeds by any suitable cutting device, to the section of the loop Bc, the second side C2 of the panel P and to the section from the upstream end of the first side of the panel. FIG. 2e illustrates the result of the section: a pair of individual wires Fil, Fi2 are obtained through the perforation of the panel, constituted by the upstream and downstream strands Ba, Bv.

The invention will find particular application in the field of composite materials for the manufacture of composite sandwiches, having two skins, and a core material in the form of a panel, in the intermediate volume between the skins, as well as fibrous reinforcements consisting of said individual son, formed in perforations, according to the thickness of the soul, and connecting the skins.

Thus, and once the individual son inserted and formed in the perforations of the panel according to the method of the invention, the skins can be applied to the two surfaces of the panel intended to form the intermediate core. The application of a resin will, once polymerized, to ensure the joining of the skin / soul interfaces, to impregnate the individual son, by joining the free ends of son Fil, Fi2 to said skins. The invention also relates to such a composite sandwich obtained according to the process according to the invention.

NOMENCLATURE

B. Coil of wire,

Ba. Upstream strand,

Bv. Downstream strand,

Bc. Loop of wire (coming from the second side C2 of the panel), Ca. Canal,

Cg. Guide line,

Ct. Knife,

Cl. First side of the panel,

C2. Second side of the panel,

Ex. Free End (Insertion Element),

Gm. Motorized roller

I. Insertion element,

Me. Mechanical means,

Mu, Mi ₂ . Bite of the first jaw,

M ₂₁ , M ₂₂ . Jaw of the second jaw,

P. Panel,

SL. Wire length section,

St. Cutting System (upstream strand),

Tb. Locking rod,

V. Venturi,

Ac. actuator,

Bm. Upper strand.

Claims

1. Method for inserting and placing individual wires (Wire, Fi2) through a panel (P), the individual wires each being provided protruding by their free ends, on both sides (C1, C2) of the panel (P), said method comprising the following steps:

a panel (P) is provided, as well as a longitudinal insertion element (I) having a free end (Ex),

a spool of thread (B) is provided and a length section of the yarn (SL) is unwound, along and in the vicinity of the panel (P), arranged on a first side (Cl) of the panel,

the panel (P) is perforated with said insertion element (I), by the displacement of said insertion element (I) along its longitudinal axis, from said first side (C1) of the panel (P) and through of the panel, and simultaneously the wire is carried by a pushing action of said insertion element (I) on the wire, at the free end (Ex) of said element, and until said insertion element (I) and the wire emerge from the second side of the panel (C2) and so as to dispose through the perforation of the panel thus created, an upstream strand (Ba) and a downstream strand (Bv) with reference to a loop ( Bc) of the wire emerging from the second side (C2) of the panel,

the wire is cut at the level of the upstream strand (Ba), the first side (Cl) of the panel (P), and at the level of the loop (Bc) of the second side of the panel (C2), obtaining a pair of individual wires (Wire, Fi2) through the perforation of the panel, consisting of the upstream and downstream strands (Ba, Bv).

2. Method according to claim 1, wherein one chooses for said insertion element (I) an element in the form of a blade.

3. Method according to claim 2, wherein the blade has at least one reinforcing ply, and / or a curvature, oriented in the longitudinal direction of said insertion element (I).

4. Method according to claim 2 or 3, wherein the thrust action on the wire is provided by the edge of the free end (Ex) of said insertion element (I).

5. Method according to claim 2 or 3, wherein said blade has at its free end, an opening (O), and in which the thrust action on the wire is provided while the length section of the wire ( SL) passes through said opening (O) of said insertion element.

6. Method according to one of claims 1 to 5, wherein said wire cutting step is performed at the level of the loop (Bc), firstly, while maintaining the upstream strand (Ba) and the downstream strand ( Bv) on the first side of the panel (C1) engaged with mechanical means (Me), and on the other hand, by the pushing action of said insertion element (I) and until the free end said insertion element (I) cuts off the loop (Bc) of the second side of the panel (P).

7. Method according to one of claims 1 to 5, wherein said wire cutting step is performed at the loop (Bc), only once said insertion member (I) removed from said panel.

8. Method according to one of claims 1 to 7, wherein the perforation action of said insertion member is controlled by an actuator such as a pneumatic or electric cylinder or a linear motor.

9. Method according to one of claims 1 to 8, wherein the unwinding step of a wire length section (SL) is controlled by a motorized roller (Gm).

The method according to one of claims 1 to 9, wherein the wire length section is guided and held in a guide channel (Ca) of direction substantially perpendicular to the axis of the insertion element. (I), said channel (Ca) being positioned just upstream of the insertion tool when said insertion element (I) is in the retracted position, said channel (Ca) being intended to be traversed by the element d insertion (I) when the latter is moved in the direction of insertion and so as to take the wire present in the channel through a lateral opening (01) of the channel.

11. Method according to one of claims 1 to 10, wherein there is provided robotic means and / or automated to allow:

different positions of said insertion element (I) with respect to the panel (P),

different inclinations of said insertion element relative to the plane of the panel (P) and in such a way as to allow the insertion of a plurality of pairs of individual wires (Wire, F2) according to a spatial distribution of the configurable insertion points and according to adjustable inclinations.

The method of claim 9 and 10, wherein:

said insertion element (I) and its actuator (Ac) are integral with a frame,

- The robotic and / or automated means allow the manipulation of the panel (P) in different positions and different inclinations of the panel relative to said insertion element.

13. Mechanized device for implementing the method according to claim 6, having a self-supporting assembly (1) comprising:

said insertion element (I), movable along its longitudinal axis with respect to a fixed part of the device,

a channel (Ca) and wire guiding and driving means configured to predispose a wire length section (SL) in the channel (Ca),

an actuator (Ac) arranged to move said insertion element (I) along its longitudinal axis in the direction of the thrust through said channel (Ca), from a retracted position of said insertion element (I) and up to at an extended position of said insertion element (I),

- Mechanical means (Me) comprising a first jaw (Mu, M ₁₂ ) adapted to maintain said upstream strand (Ba), and a second jaw (M ₂₁ , M ₂₂ ) adapted to maintain the downstream strand (Bv ) and to allow the cutting of the loop (Bc) under the pushing action of the free end (Ex) of said insertion element,

a cutting system (Se) of said upstream strand (Bm),

wherein the wire length section (SL) is guided and maintained in said directional channel (Ca) substantially perpendicular to the axis of the insertion element (I), said channel (Ca) being positioned just upstream of the insertion tool when said element insertion device (I) is in the retracted position, said channel (Ca) being intended to be traversed by the insertion element (I) when the latter is moved in the direction of insertion and so as to carry the present wire in the channel through a lateral opening (01) of the channel.

14. Installation comprising a mechanized device according to claim 13, and a multi-axis robot, for example a six-axis robot, and wherein the self-supporting assembly is carried by the robot arm, or alternatively the multi-axis robot allows the manipulation of the panel and the self-supporting assembly is integral with a frame.

15. Use of the method according to one of claims 1 to 12, the device according to claim 13 or 14, in the field of composite materials for making wired insertions in a panel for the manufacture of composite sandwiches, having two skins, as well as a core material in the form of said panel (P), in the intermediate volume between the skins, as well as fibrous reinforcements constituted by said individual threads, formed in perforations according to the thickness of the core intended for connect the skins.

16. Composite sandwich resulting from the use according to claim 15.