| 摘要 |
<p>A free ink roller ball pen (20) for dispensing low viscosity inks containing pigments that are prone to sedimentation. The instrument contains an ink reservoir chamber (24), a nib chamber (23) provided with a roller ball socket assembly (30), a pressure equalization overflow chamber (50, 51) for the low viscosity ink, and a special agitation system for the ink reservoir and nib chamber. The agitation system comprises a weight (38), with a cross section smaller than the interior of the nib chamber, connected to a wire (46) having a diameter smaller than the back inner diameter (35) of the ball socket assembly. The length of the weight (38) and its confinement are selected to provide for a predetermined stroke, on shaking the pen, that sweeps out the internal space of the nib and also the back of the roller ball assembly, to re- disperse any pigment that has precipitated.</p> |
