| 摘要 |
PURPOSE: To provide an adequate ink-backflow preventive function by installing a valve cylinder body equipped with a regulation part which contacts a valve body when the valve body is moved forward and a valve seat which prevents ink from flowing by the contact with the valve body when the valve body is moved backward in the front and rear parts of the inner wall of a valve chest separately from a holder. CONSTITUTION: The large-diameter part 24 of a holder 2 is pushed into the opening end of an ink receiving tube 7 to be fixed, and a valve unit 4 composed of a valve cylinder body 5 made of an elastic material and a valve body 6 of a metal ball is engaged with the inner wall of the intermediate part of an ink passage 3 in the holder 2. The valve cylinder body 5 is obtained by the injection molding of a soft polypropylene or polyethylene, and a regulation part 52 and a valve seat 51 are formed integrally in the front and rear parts of the inner wall. A valve chest 53 is formed between the valve seat 51 and the regulation part 52, and a valve body 6 is placed freely movably in the valve chest 53. The valve chest 53 is made to communicate with the outside from both ends of the valve cylinder body 5 through the valve hole 54 of the valve seat 51 and the ink passage hole 55 of the regulation part 52. |
