Liquid-ink writing instrument having a reservoir fitted with a system to prevent loss of priming

A writing instrument, comprising:

• a writing tip;
• a reservoir containing a liquid ink, said reservoir having a first end and a second end;
• a capillary transfer rod having an outer diameter, said capillary transfer rod extending from said first end to said second end of said reservoir and constructed and arranged to transfer said liquid ink from said reservoir to said writing tip;
• a capillary element including an orifice, said orifice having an inner diameter greater than the outer diameter of said capillary transfer rod, said capillary element being slidably mounted around said capillary transfer rod so as to move freely in said reservoir;
• and
• an outside edge of said capillary element coming into the immediate vicinity of an inside wall of the reservoir in such a manner that said capillary element comes substantially flush with an inside wall of said reservoir as it slides along the transfer rod.