| 摘要 |
A writing device including a main body portion having at the front end a writing tip through an ink flow-out control mechanism comprising a valve main body including ink introducing ports, a valve element supported in the valve main body movably forward and backward, and a coil spring for biasing a valve element in the direction of closing a valve seat inserted in the valve main body. The main body portion is formed of an inner pipe and an outer pipe, and a heat shielding space is provided between both pipes. Further, the spring pressure of the coil spring for biasing the valve element in the direction of closing the valve seat inserted in the valve main body is specified to be approximately identical to the writing pressure in writing, and a restriction portion for restricting the opening amount of the valve element against the valve seat is provided at either of the valve element or the valve main body.
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