| 摘要 |
PURPOSE: To obtain an adequate ink-backflow preventive function and to facilitate assembly 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 separately from an ink receiving tube. CONSTITUTION: The small-diameter part 71, middle-diameter part 72, and large-diameter part of an ink receiving tube 7, which are arranged in sequence from the front end to the rear part of the tube 7, are formed integrally, and a valve unit 4 and a pen point 3 are pushed into the inner wall of the small diameter part to be fixed. The valve unit 4 is composed of a valve cylinder body 5 made of an elastic material and a valve body made of a metal ball, and in the cylindrical valve cylinder body 5, 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, a valve body 6 is placed freely movably in the valve chest 53, and 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. |
