This invention relates to an inkjet printing device of a franking machine intended
to print postal indicia on a mail piece to be franked, displaced with respect to
this device in a direction of displacement, the postal indicia comprising at least
an amount of franking, a date of deposit and an authentication code and the printing
device comprising, on the one hand, a plurality of nozzles for ejecting ink droplets,
disposed in two rows extending transversely to the direction of displacement, these
two rows of nozzles being spaced apart from each other by a distance in this direction
and, on the other hand, a control means for selectively controlling the ejection
of these ink droplets as a function of the postal indicia to be printed, said control
means being arranged so that, during printing, each of the critical postal data
such as the amount of franking, the date of deposit or the authentication code,
is printed from one row of nozzles.
