| 摘要 |
<p>To prevent faint writing or writing failure from occurring during a writing operation due to back shock and to reduce shock sound by using a simple structure. Pressure contact means (5) protrudes from one surface or both surfaces on the side of a shaft tube (1) and a knock body (2) so as to come into sliding contact with each other, parts on the side of the shaft tube (1) and the knock body (2) being opposed to each other in a radial direction. Accordingly, even when the part on the side of the knock body (2) retreats with respect to the part on the side of the shaft tube (1) in terms of a releasing operation, a retreat speed of an ink tank (3) becomes slow due to a friction resistance of the pressure contact means (5), and thus back shock remarkably reduces. As a result, ink does not flow to the ink tank (3) in a reverse direction due to air introduced from a writing tip portion (3a), and shock sound generated when the retreating ink tank (3) returns to a normal position reduces.</p> |
