| 摘要 |
PURPOSE:To prevent the leakage of ink during preservation and thinning and writing defect by blowing out and evaporating of a solvent component by elastically supporting an inside surface sealing body which is pressed to the bottom end of a hard ball and integrates a bar body freely sliding in an ink leading out hole and a cap body. CONSTITUTION:The hard ball 2 comes into contact with the front end of a bar body 7 of the inside surface sealing body 9 and the cap body 8 integrated with the bar body 7 is elastically supported by a spring 10 in nonuse. The upper half of the cap body 8 comes into tight contact in an annular form with the upper surface of an ink passage 5 and in addition, the elastic repulsive force of the spring 10 acts thereon and, therefore, the inside surface sealing body 9 completely hermetically seals the ink leading out hole 4, thereby preventing the outflow of the ink and the evaporation of the ink component. The ball 2 is retreated by a slight distance together with the inside surface sealing body 9 to retreat the inside surface sealing body 9 against the elastic repulsive force of the spring 10 when the writing pressure acts on the hard ball 2. A slight spacing is then generated at the upper end face of the ink passage 5 and the upper half of the cap body 8, by which the outflow of the ink, i.e., writing, is made possible. |
