Patent ID: 8746860
Filing Date: 2014-06-10
Classification: B41J

Abstract:
1. Process for cleaning an ink supply system for an inkjet printer with a print head assembly, said inkjet printer comprising at least one print head with one or more nozzles for at least one color, in which the ink circulates from a supply tank to a return tank via the print head and back to the supply tank during printing, wherein the at least one print head is linked via a first connection line with the supply tank, which is connected with an intermediate tank via a filler line with a first interconnected conveyance device and filter assembly, and also via a second connection line with the return tank, and wherein a pressure differential between the pressure in the supply tank and the pressure in the return tank can be maintained by a pressure control device, said pressure control device controlling a flow of ink from the supply tank via at least one flow channel in the at least one print head to the return tank, wherein the return tank is linked with the intermediate tank via a return line, where applicable also with a second interconnected conveyance device, wherein the differential pressure between the pressure in the return tank and the pressure in the supply tank is intermittently changed by the pressure control device, such that the flow direction of the ink through the at least one print head is reversed intermittently and during an ongoing printing process for a predetermined period of time to achieve cleaning.