with the nozzles of the grid not used for printing and also comprises a plurality of selecting elements transistors 12 in correspondence with the resistors or fuses 21 and the resistors 11 the identifying elements 21 are therefore in correspondence with empty is positions of the grid m u00d7 n in each encoding assembly 24 each transistor 12 of known type has the drain terminal that can be connected to one of the two terminals of the resistor 11 or of the fuse 21 the source terminal connected in common to the sources of the transistors 12 belonging to the same encoding assembly 24 and the gate 20 terminal connected to the contacts 23 corresponding to address selection lines address line select or addresses a i 1 u2212 n the resistors 11 and the fuses 21 belonging to an encoding assembly 24 have the second terminal connected in common and to a contact 23 corresponding to a primitive feeding line primitive select or primitive p j 1 u2212 m in particular each actuating assembly 14 and each encoding assembly 24 are activated by means of contacts or primitives p j 1 m and each transistor 12 is selected by means of contacts or addresses a i 1 n the head according to the invention therefore comprises a driving and encoding circuit 20 having a grid like structure formed by the actuating 11 identifying 21 and selecting 12 elements having m rows and n columns in which n is the number of selectable addresses a i and is equal to the sum of the number of resistors 11 and fuses 21 and m is the number of primitives p j suitable for activation generally in the known heads.