Abstract: A process for selectively lacing filaments on multi-dimensional textile preforms made of rods, the rods are displaced by the filament and pressed vertically downwardly by a needle with an open eye which, after passing through the piece to be laced, is opened at an insertion station for the filament to receive the filament, then is raised to pass the filament through the space freed by the rod.

Abstract: The invention relates to a process for selectively lacing filaments on multi-dimensional textile preforms made of rods, in which the rods are displaced by the filament, the rods being pressed vertically downwardly by a needle (3) of the type with an open eye which, after passing through the piece to be laced and ejection of the rod, is opened at a so-called insertion station (9) for the filament to receive the filament to be laced (21), then is raised to pass the filament through the space freed by said rod, characterized by the following steps:

Abstract: A process and apparatus for depositing simultaneously by winding on a support, several rovings of pre-impregnated fibers. The rovings are deposited simultaneously by winding on a rotating support. At least two rovings are brought into superposition near where they will be applied to the support, and the various rovings are subjected to different tensions depending on their position relative to the support. Specifically, the roving nearest the support is subjected to a greater tension than a roving farther from the support. Composite structures are thus produced.

Abstract: The present invention relates to a method for producing a reinforcement for a composite component, said reinforcement including superposed plies of thread, according to which method:straight portions of thread are laid down on a support; andall the superposed plies are consolidated by stitching, without knotting, a continuous thread.According to the invention:said straight portions of thread (4, 5) are laid down by means of a needle, with respect to which the continuous thread (F), of which each of said portions forms part, can slide, said needle being capable of moving relative to said support (6), pulling tight the straight portion of thread (4, 5) above the latter, over an extent equal to the length of said straight portion of thread; andsaid straight portions of thread (4, 5) are fixed by stitching, without knotting, at least one of the ends (4a, 4b; 5a, 5b) of each of said portions of thread into said support (6) using said needle.

Abstract: Method for laying filaments on a convex axisymmetric surface, especially a hemispherical surface, provided with a circular hole or a dead zone centered on the pole, wherein a regular set of points are defined on a reference circle of the surface, the filament being laid along a geodesic path from one first departure point to one first arrival point on the reference circle, the same laying process being reproduced for a second pair of departure and arrival points so as to lay a set of filaments (so-called a lap) and then the same laying process is repeated via successive shifts until each point of the reference circle is at the same time and solely a single departure and arrival point, so as to obtain a layer, and possibly restarting the process until the desired thickness is obtained.

Abstract: A method and weaving machine for weaving a thick reinforcing fabric comprising multiple noncleaving layers with a 2.5 D or 3 D type structure. The warp yarns successively move into a yarn joining comb, a calibrating comb and then into a dobby weaving unit, where the warp yarns on n superimposed laps are separated upstream of the calibrating comb, n being equal to (N- 1/2 ) and N being the number of layers of said reinforcement so as to have (N- 1/2 ) warp yarns moving into each tooth of the calibrating comb. Two adjacent yarns of a given tooth of the calibrating comb are threaded into the eyes of two heddles of the same row of two heddle frames of the dobby, so that the displacement planes of two adjacent yarns during formation of the shed form between them a sufficient angle so as to prevent the yarns from catching on one another.

Abstract: A composite reinforcement element comprising three superimposed and crossed even layers of threads and a continuous thread extending perpendicularly through the three superimposed even layers. The layers are impregnated with a binder and the binder is polymerized after impregnation. The superimposed and crossed even layers are initially maintained assembled, before the impregnation and the polymerization of the binder, by a conjugate action of gripping and friction of the three superposed and crossed even layers of threads on the continuous thread which extends therethrough. The continuous thread forms an internal surface of the composite reinforcement element which protrudes from the superimposed and crossed even layers of threads in the form of open loops which are interconnected on an external surface of the element.

Abstract: The machine comprises a frame (1, 2, 3, 4), a rotary mandrel (15) mounted on a horizontal shaft (14), a vertical arm (12) having a detachable work device (20) at the lower end of the arm, and means (M1, M2, M3) for shifting the arm (12) along three orthogonal axes (X, Y, Z).

Abstract: A plurality of parallel layers of fibers are laid in two crossed directions on a disposable support mandrel, pins are temprorarily implanted in the mandrel (15) composed of foam material in regions of evolution of its shape and at points where it is desired to change the direction of the fiber, a continuous thread (33) is stretched out between the pins so as to form crossed superimposed layers, and a continuous fiber (50) is introduced by means of a needle (43) through the layers and forms successive open loops (53). The loops (53) are maintained by the elastic pressure exerted by the foam material and the gripping action of said layers. The fibers are impregnated with a binder and the binder is hardened and the mandrel is destroyed.