Fuente: WIPO "tomato" There is described a folding apparatus (16) for forming finalized packages (2) from semi-finalized packs (5) filled with a pourable product. The folding apparatus (16) comprises a manipulation assembly comprising a plurality of engagement assemblies (44), each engagement assembly (44) having a respective pair of engagement elements (45) configured to laterally engage the respective semi-finalized packs (5) from opposite sides thereof. Each engagement element (45) is movable between an idle position and an active position in which the engagement element (45) is, respectively, disengaged from and engaged to the respective semi-finalized packs (5). The conveying device (31) also comprises a cam mechanism (47) configured to control the engagement elements (45) between the respective idle positions and active positions. The cam mechanism (47) comprises an active section (58) having a first portion (62) and a second portion (64). The first portion (62) and the second portion (64) are movable with respect to one another.