Patent ID: 8602513

Claim:
An inkjet printing apparatus comprising: a first ink tank configured to contain an ink to be supplied to a printing head performing printing by ejecting the ink; a second ink tank located between the first ink tank and the printing head and configured to temporarily store the ink to be supplied from the first ink tank to the printing head; an air communication valve capable of opening and closing a communicating portion allowing an inside of the second ink tank to communicate with the atmosphere; a variable volume member located in an ink supply path between the second ink tank and the printing head and being capable of changing an internal volume thereof; and a driving mechanism configured to drive the air communication valve to thereby open and close the air communication valve, and to drive the variable volume member to thereby generate a change in the internal volume thereof, wherein in the ink supply path, a resistance value of a flow path from the variable volume member to the printing head is greater than a resistance value of a flow path from the variable volume member to the second ink tank, and the driving mechanism generates bidirectional flow of the ink between the variable volume member and the second ink tank by driving the air communication valve to open or to close the air communication valve and driving the variable volume member to change the internal volume thereof.