Inkjet printing apparatus and control method of the inkjet printing apparatus

A control method of an inkjet printing apparatus, wherein the apparatus comprises:

• a print head having an ejection opening surface on which ejection openings for ejecting ink are formed;
• a tank storing ink to be supplied to the print head;
• a supply flow path for supplying the ink from the tank to the print head;
• a collection flow path for collecting the ink from the print head to the tank;
• and
• a cap configured to cover the ejection opening surface;
• wherein the control method comprises the steps of:
• covering the ejection opening surface with the cap;
• driving a supply pump so as to fill the supply flow path and the print head with the ink;
• separating the ejection opening surface and the cap when the print head is filled with the ink;
• and
• driving the supply pump and the tank decompression pump simultaneously so as to fill the collection flow path with the ink.

An inkjet printing apparatus comprising:

• a print head having an ejection opening surface on which ejection openings for ejecting ink are formed;
• a tank storing the ink to be supplied to the print head;
• a supply flow path for supplying the ink from the tank to the print head;
• a collection flow path for collecting the ink from the print head to the tank;
• a supply pump provided in the supply flow path to supply the ink from the tank to the print head;
• a tank decompression pump which decompresses the inside of the tank;
• and
• a control unit configured to control to drive the supply pump and the tank decompression pump simultaneously in the state that the supply flow path and the print head are filled with the ink so as to fill the collection flow path with the ink,
• the inkjet printing apparatus further comprising:
• a cap constructed to cover the ejection opening surface;
• and
• a cap decompression pump connected to the cap and constructed to decompress the inside of the cap,
• wherein before the start of ink filling operation of the collection flow path, the control unit controls to drive the supply pump and the cap decompression pump with the ejection opening surface covered with the cap to fill the print head with the ink.