Patent ID: 8360946

Claim:
A machine for the manufacture of bags, comprising at least one support element formed by a rotating shaft suitable for the detachable coupling of a winding core of a portable storage of a consumable material in the form of a roll from which the bags are made and mechanical means comprising a transmitting and receiving antenna arranged to transmit and receive at a working frequency for making bags from the consumable material, the machine provided with remote reading means for reading information stored in a radiofrequency tag included in the portable storage when the portable storage is coupled in the at least one support element; and with a control unit connected to the reading means which contains means for obtaining information from the radiofrequency tag, which allows identifying the type of consumable material coupled in the at least one support element, and for automatically generating a signal for controlling the mechanical means, susceptible of being used to stop the operation of the machine, depending on the information obtained by said control unit; the antenna arranged in the proximal end of the rotating shaft, fixed relative to the chassis of the machine and extending in a plane perpendicular to the rotating shaft; the antenna comprising a feed microstrip and a curved exceeded arch-shaped radiant slot located in a ground plane parallel to the microstrip and separated from the microstrip by a dielectric substrate, the curve of the slot having a substantially constant radius and curved around a central hole through which the shaft passes.