| 摘要 |
Ink supplied from an ink tank (4) via a tube and air bubbles contained in the ink are stored in a first chamber of an air trap unit. At recording operation, the ink is allowed to flow from the first chamber to a third chamber via a filter disposed therebetween, and is supplied to a recording head via the third chamber. At purging operation, the ink flows at high speed, so that the filter regulates the high-speed ink-flow to flow from the first chamber to the third chamber. Therefore, the ink flows from the first chamber to a second chamber via a first connecting portion and then flows from the second chamber to the third chamber that connects a lower end of the second chamber with the recording head. Thus, the air trapped in the first chamber is discharged from the recording head along the high-speed ink-flow. In addition, a second rib is provided to an upper wall of the air trap unit so as to protrude in a direction perpendicular to an ink-flow direction. A space is provided by the second rib and the upper wall disposed downstream of the second rib in the ink-flow direction. With this structure, a predetermined amount of air remains in the air trap unit (11) even when the ink flows by a reset purging operation. Accordingly, the residual air in the air trap unit absorb a kinetic pressure due to inertia of the ink in the tube in accordance with the movement of a carriage. <IMAGE> |
