Patent ID: 6722868
Filing Date: 2004-04-20
Classification: B29C

Abstract:
Machine for manufacturing containers made of thermoplastic material by drawing and blow-molding a preform (10), of the type having several blow-molding stations (12) that are mounted on a carrousel (14) driven in continuous rotation around its axis (A1) with respect to a frame (46) of the machine, and of the type in which each station (12) is equipped with at least one drawing rod (20) that is slidably controlled along its axis (An) in order to draw the preform (10) during the blow-molding operation, characterized in that the drawing rod (20) is controlled by a magnetic device comprising at least one fixed magnetic guide (36, 38, 40, 42) placed around the axis of rotation (A&) of the carrousel (14) and a slide (24) that is integral with the drawing rod (20) and which carries at least one magnetic block (32, 34), and in that the block and the guide cooperate by magnetic coupling so that, depending on the angular position of the carrousel (14), the guide imposes a specific axial displacement on the slide (24).