| 摘要 |
The slider (16) moves forward by the resilience of spring (13) to pull forward the lead core (14) by the frictional force of a friction member (20). When interrupting a writing or freeing the tip of the slider pipe (18) from the paper. The holding force of lead chuck (6) given by spring (12) for engaging the lead core (14) is arranged to be weaker than that of the spring (13) so as to allow the advancement of the core by spring (13) with suppression of the spring (12). The lead core keeps projecting at a given distance from the tip of the pencil.
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