| 摘要 |
PROBLEM TO BE SOLVED: To provide a means to solve the problems that a gas permeates into an ink-feeding tube, and in addition, air bubbles flows in the feeding tube. SOLUTION: This ink-feeding tube is constituted in such a manner that a fiber bundle is enclosed in the ink-feeding tube. More preferably, regions having different ink capillary forces or ink contact angles are provided into a concentric circular shape or a divided shape into the right and the left. While keeping a smooth ink-feeding property, air bubbles which tend to mix in/flow to the downstream side are trapped in the feeding tube. |
