Patent ID: 8348365
Filing Date: 2013-01-08
Classification: B41J

Abstract:
1. An inkjet printing system, comprising: a liquid supply tank for storing a liquid; a print device for performing a printing process on a print medium, wherein the print device comprises at least one print cartridge, each print cartridge is provided with plural nozzles, and there is an altitude difference between the print cartridge and the liquid supply tank; an internal pressure-adjusting device, which connects to the liquid supply tank and the print cartridge, and performs a suction process on the print cartridge; and working software for calculating and defining a preliminary altitude of the print cartridge, a predetermined liquid supplementing altitude of the print cartridge, and a working time of the internal pressure-adjusting device; wherein when a liquid level of a liquid inside the print cartridge is lower than the preliminary altitude and below a lower limit of the predetermined liquid supplementing altitude, the working software controls the internal pressure-adjusting device to suck partial gas from the print cartridge into the liquid supply tank to increase a negative pressure inside the print cartridge, and the liquid stored in the liquid supply tank is introduced into the print cartridge to balance the negative pressure inside the print cartridge.