Fuente: WIPO "tomato" There is described a package forming apparatus (1) comprising a first operative unit (4) and a second operative unit (5) each of which comprises a plurality of operative devices (7) and a conveyor device (8) configured to advance the plurality of operative devices (7) Each operative device (7) comprises a cart (10) moveably coupled to the conveyor device (8) and an operative group (11). Each conveyor device (8) comprises a control unit (12) configured to advance the carts (10) along an advancement path (Q) and a braking device (18) configured to interact with a respective braking pad (19) of each operative device (7) and configured to allow and to impede advancement of the operative devices (7). Each braking device (18) comprises a first plate assembly (20) and a second plate assembly (21) spaced apart from one another, forming a space (22) therebetween and being movable between a release position and a clamping position. The actuator assembly (23) comprises at least one actuator (30) connected to the first plate assembly (20) and configured to induce a movement of the first plate assembly (20). The at least one actuator (30) comprises a piston (31) and a ball joint assembly (35) connected to the piston (31) and the first plate assembly (20).