| 摘要 |
PROBLEM TO BE SOLVED: To save wastful time and ink required for removing bubbles in an ink supply tube. SOLUTION: Ink is sent out of a liquid chamber 100 by a propeller 301 driven by a motor 303 to be send to a recording hard 200 through a supply tube 102a and returned to a liquid chamber by a return tube 102b to be circulated to discharge bubbles in the tube. The drive voltage of the motor is controlled to set the number of rotations of a propeller 301 so as to obtain pressure not discharging sent ink from a nozzle 201. By providing a pressure sensor or a bubble detection sensor to the supply tube 102a or driving them in combination with a flow sensor, further effective removal of the bubbles becomes possible. |
