Patent ID: 7344231

Claim:
Digital device for printing on “open” or “closed” surface substrates by demand bubble-jet comprising a main reservoir and a print module which moves in relation to the substrate, said print module containing at least one built-in ink reservoir with a system of anti-splash partitions, at least one printhead and one buffer reservoir, characterized in that it comprises: an ink level sensor attached to said main reservoir for detecting the ink level in said main reservoir; an ink inflow at the top of said built-in ink reservoir for receiving pressurized ink from the main reservoir; means for creating, during operation of said print module, on the one hand, a vacuum in the built-in ink reservoir, and, on the other hand, an air pressure in the built-in ink reservoir for printhead cleaning phases; a sensor attached to said built-in ink reservoir for detecting the ink level in said built-in ink reservoir; and active regulation means using said sensor for regulating said vacuum by adjustment of the built-in ink reservoir ink level and controlling flow of ink coming through said ink inflow into the built-in ink reservoir.