Braiding machine with a reserve zone
A braiding machine includes a plurality of yarn feed spindles movable along a guide path so as to participate in the braiding, a reserve zone able to receive at least one spindle such that its participation in the braiding is interrupted.
1 . A braiding machine comprising:
a plurality of yarn feed spindles movable along of a main guide path so as to participate in the braiding,
a reserve zone adjacent to the main guide path, situated around the main guide path and comprising at least one secondary guide path able to receive at least one yarn feed spindle and to retain it in the reserve zone so that its participation in the braiding is interrupted, each secondary guide path being associated with at least one switching element which is movable between a first position preventing the communication between the main guide path and the secondary guide path, and a second position allowing this communication and configured to enable passage of at least one yarn feed spindle between the main guide path and the secondary guide path, and
a cutting device configured to cut a yarn coming from a yarn feed spindle present in the reserve zone while the braiding operation continues.
2 . The machine according to claim 1 , further comprising a shaping mandrel on which the braiding is intended to be carried out.
3 . The machine according to claim 1 , wherein the reserve zone is formed by a plurality of reserve regions distributed along the main guide path, each reserve region comprising a secondary guide path separated from the secondary guide paths of the other reserve regions.
4 . The machine according to claim 1 , said machine comprising a plurality of main notched wheels configured to be rotated in order to circulate the yarn feed spindles along the main guide path, said machine further comprising one or more secondary notched wheels in the reserve zone, each secondary guide path of the reserve zone being associated with at least one secondary notched wheel configured to be rotated in order to circulate at least one yarn feed spindle along said secondary guide path.
5 . The machine according to claim 4 , said machine comprising at least one decoupling system of the rotation, configured to make the rotation of at least one secondary notched wheel independent of the rotation of the main notched wheels.
6 . The machine according to claim 1 , wherein at least some of the switching elements are movable in translation in order to pass from the first to the second position.
7 . The machine according to claim 1 , wherein at least some of the switching elements are movable in rotation in order to pass from the first to the second position.
8 . The machine according to claim 1 , said machine further comprising a control unit configured to actuate the at least one switching element.
9 . A method for braiding a braided structure comprising a first zone having a first cross-section and a second zone having a second cross-section different from the first cross-section, the method using a machine according to claims 1 and comprising:
braiding of the first zone of the braided structure with a first number of yarn feed spindles movable along the main guide path, and
braiding of the second zone of the braided structure with a second number of yarn feed spindles movable along the main guide path, the second number of yarn feed spindles being different from the first number of yarn feed spindles through the passage of yarn feed spindles between the main guide path and the reserve zone by actuation of the at least one switching element.