| 摘要 |
A marking instrument, such as a reservoir pen, has a valve (10, 12) for controlling communication between a reservoir chamber (2) and a feed channel (7) extending through a feed member (6) to a marking tip. The feed member is retractable to open the valve when the tip is pressed against a surface. A subchamber (20) is confined by a diaphragm (8) sealingly connected between the feed member (6) and the barrel, and when the marking tip is lifted from the surface, the diaphragm pushes the feed member (6) forwardly so that the valve closes, after which the volume of the subchamber (20) increases so that ink is drawn both through the channel (7) from the tip. |
