Writing implement

A writing implement of a direct liquid type comprising an ink tank, an ink flowing portion for connecting the ink tank and a writing end and for transmitting the ink to the writing end, a temporary ink reserve part for temporarily holding ink, and an air supplying portion for supplying air at the temporary ink reserve part,

• wherein the temporary ink reserve part comprises at least a temporary ink reserve groove and an ink guide groove;
• the temporary ink reserve groove is constituted by a plurality of lateral grooves for temporarily holding ink by a capillary force;
• the ink guide groove is constituted by a vertical groove for enabling to exchange air to inside of the ink tank via the temporary ink reserve groove while communicating the temporary ink reserve groove and the ink tank;
• a portion of the ink guide groove on a side thereof to the ink tank is constituted by an ink introducing groove constituting a wide groove;
• the ink introducing groove is formed by a slender groove communicating with a number of the temporary ink reserve grooves and forming a meniscus by ink, and the ink introducing groove constituted by the wide groove for releasing ink from a capillary force of the slender groove and formed from a side of the ink tank by an arbitrary length;
• a portion at a boundary between the wide groove and the slender groove constitutes an air exchanging hole having a small section;
• the ink introducing groove constituting the wide groove is of a size to a degree by which a coagulating force of an ink solution produced inside the wide groove does not hamper air bubbles supplied from the air exchanging hole constituting the boundary portion from being floated up;
• a total of an opening portion to the temporary ink reserve groove communicated from the ink introducing groove constituted by the wide groove is constituted by a very small groove having a very small section and is made airtight by a meniscus of ink;
• a meniscus of the air exchanging hole is easy to destruct more than the meniscus of the very small groove constituting the opening portion of the temporary ink reserve groove;
• and
• a distance G from the writing end to an end portion of the temporary ink reserve groove on a side thereof to the ink tank and a distance H from the writing end to the ink introducing groove of the ink guide groove, is brought into a relationship shown below:
• G>H.