In some printers, a printhead receives a stream of a printing fluid from an intermediate tank
which is supplied with ink from a supply tank. In such a system, printing fluid can be fed from
the intermediate tank to the printhead using an air pump to pressurize the supply of ink by
pressurizing the air volume inside the tank.
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INC, HP, "WHITE PRINTHEADS (OR PURGERS) REMOVAL ROUTINE TO REDUCE INK SPILL", Technical Disclosure Commons, (January 12, 2021)