Magnetic marking system, method and machine for producing the same

A method for the production of a magnetic marking, constituted by a carrier sheet made of adhesive-coated material that fixes one or more wires having ferromagnetic properties in pre-established positions on or in the carrier sheet, the carrier sheet being covered with a protective sheet, the method comprising:

• unwinding a coil of virgin adhesive complex comprising a carrier sheet made of adhesive-coated material and a protective sheet covering the adhesive-coated material;
• delaminating the adhesive complex by separating the adhesive-coated carrier sheet from the protective sheet, while advancing both sheets;
• depositing one or more wires having ultrasoft ferromagnetic properties on the adhesive-coated carrier sheet in a longitudinal direction of travel of the carrier sheet by positioning the one or more wires transversely in a precise manner in correspondence with one or more pre-established parallel positions separated by a constant gap, each parallel position corresponding to a bit of a binary code, to form a collective set of the one or more wires being present or absent in each of the parallel positions to form a detectable binary code adopted for the marking, each ultrasoft ferromagnetic wire being of identical nature, and the binary code is detectable without differentiation of magnetic properties or size of each of the one or more wires and without the provision of a hard magnet provided on the carrier;
• performing a relamination operation by returning the protective sheet onto the adhesive-coated carrier sheet furnished with the deposited one or more wires;
• and
• rewinding the reconstituted adhesive complex incorporating the one or more wires forming a magnetic binary coded marking.

A machine for production of magnetic marking constituted by a carrier sheet made of adhesive-coated material that fixes one or more wires having ferromagnetic properties in pre-established parallel positions separated by a constant gap, each parallel position corresponding to a bit of a binary code, to form a collective set of the one or more wires being present or absent in each of the parallel positions to form a detectable binary code, the carrier sheet being covered with a protective sheet, the machine comprising, in combination and from upstream to downstream:

• means for carrying and unwinding a coil of virgin adhesive complex, consisting of a carrier sheet made of adhesive-coated material and a protective sheet;
• means for delaminating the protective sheet from the carrier sheet;
• means for bringing and depositing one or more wires having ultrasoft ferromagnetic properties onto the adhesive-coated carrier sheet, including means for transverse positioning of the one or more wires in correspondence with a code adopted for the marking that fixes the one or more wires having ferromagnetic properties in pre-established parallel positions separated by a constant gap, each parallel position corresponding to a bit of a binary code, to form a collective set of the one or more wires being present or absent in each of the parallel positions to form a detectable binary code, each ultrasoft ferromagnetic wire being of identical nature, and the binary code being detectable without differentiation of magnetic properties or size of each of the one or more wires and without the provision of a hard magnet provided on the carrier sheet;
• at least one additional module that lays another wire, to correct for a missing or broken wire identified by a means for checking the presence and correct positioning of the one or more wires;
• means for relamination, ensuring the rejoining of the protective sheet and of the carrier sheet made of adhesive-coated material, furnished with the one or more wires;
• means for checking the presence and correct positioning of the one or more wires that intervenes by reading the code formed by the one or more wires;
• and
• means for driving and winding up the reconstituted adhesive complex incorporating the one or more wires,
• wherein the means for bringing and depositing one or more wires having magnetic properties further includes:
• a vertically mobile carrier, for a plurality of coils of wires having ferromagnetic properties;
• means for initial fastening and pulling of ends of the wires emanating from the coils;
• and
• a device for transverse positioning of the one or more wires, the device being located between said coils of wire and the means for initial fastening and pulling.