Method for Manufacturing Bead Wire for Producing a Tire

1 . A method for manufacturing a bead wire intended for producing a tire, wherein, with the bead wire comprising a coating that forms a region that overlaps itself in a circumferential direction of the bead wire, the bead wire is pressed using at least three jaws in contact with an entire perimeter of a section of the region.

2 . The method according to claim 1 , wherein the number of jaws is at least four.

3 . The method according to claim 1 , wherein the bead wire is pressed first of all by two of the jaws which are mutually opposed, while two more of the jaws, are held away from the bead wire.

4 . The method according to claim 3 , wherein after the pressing between the two opposed jaws, these are immobilized with respect to the bead wire and the other two jaws are brought in closer to the bead wire.

5 . The method according to claim 3 , wherein after pressing between the two opposed jaws, the bead wire is pressed using all the jaws.

6 . The method according to claim 1 , wherein during pressing, a mark is made on the bead wire so that the two axial faces of the bead wire can be differentiated from one another.

7 . The method according to claim 1 , wherein the bead wire comprises a reinforcement of polygonal cross section.

8 . The method according to claim 1 , wherein the coating comprises a padding layer and a cladding layer.

9 . A press for a bead wire adapted for producing a tire, the press comprising at least three jaws mounted with the ability to move relative to one another and able to form between them a closed-section cavity.

10 . The press according to claim 9 , which comprises an upper jaw, a lower jaw and two lateral jaws.

11 . The press according to claim 9 , which comprises gear mounted with the ability to move with respect to one of the jaws, preferably a lower jaw, and which bears the other jaws.

12 . The press according to claim 11 , wherein within the gear, two of the jaws arranged to press the bead wire between them, preferably lateral jaws, are mounted with the ability to move relative to the third one.

13 . The press according to claim 9 , wherein the jaws are mounted with the ability to move in a sliding manner with respect to a frame of the press, and the cavity has a cross section exhibiting a main axis of symmetry that is inclined with respect to directions in which the jaws slide.

14 . The press according to claim 9 , wherein each jaw is coated with at least one nonstick layer.

15 . The press according to claim 9 , which comprises means of heating the jaws.