Piezoelectric operated printer head for ink-operated mosaic printer units

In a piezoelectrically operated printer head for an ink-jet printing unit with printing jets, each printing jet having a compression chamber containing a printing liquid and being cylindrically surrounded by a cylindrical piezoelectric drive element so that a droplet of printing liquid is ejected by a piezoelectric contraction of the drive element, the improvement comprising the printer head having a body with a plurality of printing jets arranged in a pattern at a printing location on one surface of the head, each printing jet comprising an individual passage extending through the body from an orifice at the printing location to a source of printing liquid, each passage having a first segment of its length surrounded by a cylindrical piezoelectric drive element, said first segments being spaced from the printing location by a second segment of the passage, said second segments of the passages being disposed in the printer head to extend away from a pattern of orifices at the printing location in a radiating pattern without any kinks therein, and a common ink supply distributor carried on said printer head for supplying ink to each of said passages, said ink supply distributor being in communication with said passages by a common capillary filter device comprising a throttle plate containing a narrow opening for each of the passages of the body and a close mesh grid disposed between the throttle plate and the ink passages of the body.