Patent ID: 6827431
Filing Date: 2004-12-07
Classification: B41J

Abstract:
An ink tank for storing ink for supply to an ink jet head, the ink tank comprising:a main body provided with an ink supply port and an atmosphere communication port provided respectively on first and second faces of said main body, wherein the first and second faces oppose one another; an ink absorbent capable of storing ink contained in the main body and formed by stacked fibrous sheet material having a thickness such that the ink absorbent is containable in the main body, wherein a first lamination side surface of the ink absorbent faces the ink supply port and a second lamination side surface of the ink absorbent faces the atmosphere communication port; and a rib structure provided on the second face of the main body containing said atmosphere communication port, the rib structure projecting inward of the main body and comprising; a first rib portion arrayed diagonally with respect to said second lamination side surface of said ink absorbent, and a second rib portion that intersects with said first rib portion and is arrayed diagonally with respect to said second lamination side surface of said ink absorbent wherein, said first and second rib portions have respective heights such that the atmosphere communication port is spaced apart from the second lamination side surface of said ink absorbent, and wherein, the first and second rib portions contact the second lamination side surface of the ink absorbent to press the ink absorbent toward the first face of the main body containing the ink supply port.