Method for manufacturing an endless belt, of the flat type made of metal material

A method for manufacturing an endless belt (2) of flat type, made of metallic material, and adapted to be rolled about at least one indexed pulley (3) provided with teeth (33), said endless belt (2) delimited by two longitudinal edges (22) and including features (23) that are each adapted to receive a product to be conveyed, indexing perforations (26) distributed along at least one longitudinal indexing line (26′) extending parallel to said longitudinal edges (22) and configured to receive the teeth (33) carried by said at least one indexed pulley (3), and at least one additional indexing perforation (261) adapted to cooperate with the teeth (33) of said at least one indexed pulley (3),

• said manufacturing method comprising the following successive steps:
• a) a step of providing a flat strip (7), made of said metallic material, said flat strip (7) having a parallelogram-shaped contour that is delimited by two longitudinal edges (71) and by two transverse edges (72),
• wherein, with said provision step a), said flat strip (7) includes said features (23) that are each adapted to receive the product to be conveyed and said indexing perforations (26) distributed along said at least one longitudinal indexing line (26′) extending parallel to said longitudinal edges (22), but not said at least one additional indexing perforation (261);
• b) a step of closing said strip (7) by welding said two transverse edges (72) to each other through a welding line (28);
• and
• after said closing step b), c) a step of perforating said welding line (28), at said at least one longitudinal indexing line (26′), to form said at least one additional indexing perforation (261).