A method for affixing strings of alphanumeric characters or symbols to fabrics, comprising the steps of: - providing a supporting element comprising a frame provided with a plurality of holes for arranging pins of alphanumeric characters or symbols, at least one pair of stacking pins which are arranged at mutually opposite corners of said frame being provided for the stacking of similar supporting elements, said frame being provided in a lower region with protrusions for arranging said stacking pins, said protrusions being arranged at diagonally opposite corners of said frame - mounting the alphanumeric characters or symbols on said supporting element that is adapted to allow to arrange pins of said alphanumeric Z characters or symbols in holes of said supporting element, so that the character portion of said alphanumeric characters or symbols protrudes from said supporting element; - loading said supporting element, with said alphanumeric characters or symbols affixed thereto, on a punch (11, 12) of a press; - mounting a strike plate for said alphanumeric characters or symbols on a counter punch (12, 11); - removing said supporting element so as to leave said alphanumeric characters or symbols arranged in said punch (11, 12); - interposing a layer of fabric between said two punches (11, 12) and performing a pressing step; and - opening the press and extracting the fabric with the alphanumeric characters or symbols affixed thereto, said step of loading said alphanumeric characters or symbols in said punch (11, 12) comprises loading said alphanumeric characters or symbols, mounted on said supporting element, at a lower punch, said step of loading said alphanumeric characters or symbols in said lower punch comprising loading said alphanumeric characters or symbols in an overturnable movable portion of said lower punch, said strike plate being mounted at an upper punch. - providing a supporting element comprising a frame provided with a plurality of holes for arranging pins of alphanumeric characters or symbols, at least one pair of stacking pins which are arranged at mutually opposite corners of said frame being provided for the stacking of similar supporting elements, said frame being provided in a lower region with protrusions for arranging said stacking pins, said protrusions being arranged at diagonally opposite corners of said frame - mounting the alphanumeric characters or symbols on said supporting element that is adapted to allow to arrange pins of said alphanumeric Z characters or symbols in holes of said supporting element, so that the character portion of said alphanumeric characters or symbols protrudes from said supporting element; - loading said supporting element, with said alphanumeric characters or symbols affixed thereto, on a punch (11, 12) of a press; - mounting a strike plate for said alphanumeric characters or symbols on a counter punch (12, 11); - removing said supporting element so as to leave said alphanumeric characters or symbols arranged in said punch (11, 12); - interposing a layer of fabric between said two punches (11, 12) and performing a pressing step; and - opening the press and extracting the fabric with the alphanumeric characters or symbols affixed thereto, said step of loading said alphanumeric characters or symbols in said punch (11, 12) comprises loading said alphanumeric characters or symbols, mounted on said supporting element, at a lower punch, said step of loading said alphanumeric characters or symbols in said lower punch comprising loading said alphanumeric characters or symbols in an overturnable movable portion of said lower punch, said strike plate being mounted at an upper punch.