Patent ID: 7798619

Claim:
Printing device for printing on a substrate with a printing medium using the “drop-on-demand” principle, comprising a print head, which is arranged in such a manner that it can be moved to and fro substantially transversely with respect to the direction in which the substrate to be printed is conveyed and has at least one spray nozzle with an interacting piezoelectric element for generating and releasing a drop of the printing medium on demand by generating shockwaves in the printing medium to form said drop of the printing medium, the spray nozzle being in communication with a flexible working container, which is arranged at a fixed position, for degassed printing medium at a working height with respect to the spray nozzle which working height lies within a predetermined height range, in order to keep the pressure of the printing medium within a predetermined pressure range, wherein the working container is in communication with a releasable flexible reservoir for degassed printing medium and wherein the working container and the releasable flexible reservoir have an open connection between them such that during normal operation these form communicating vessels; wherein the printing device is provided with displacement means for moving the reservoir upwards with respect to the working container; and wherein the displacement means comprise support means for supporting the reservoir, wherein the support means is configured to be tilted towards the working container.