Fuente: WIPO "tomato" There is described a magazine apparatus (10) for a packaging machine (1) The magazine apparatus (10) comprises a support device (30) configured to rotatably carry a reel (11) of a web of packaging material (3), the reel having a hollow core (22) and the web of packaging material (3) being wound about the hollow core (22) and a sensor system (42) configured to determine an arrangement position of the reel (11) with respect to a reference point. The sensor system (42) comprises one or more sensor devices (75) and a movement device (76) coupled to the one or more sensor devices (75) and being configured to move the one or more sensor device (75) along respective scanning paths (R).