| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a mechanical pencil which prevents a slider from becoming rickety and permits stable writing. <P>SOLUTION: The slider 51 is rotated by a prescribed angle in one direction around an axial line L in accordance with reciprocation in the axial line L direction. In the mechanical pencil 40, the slider 51 retreats against energizing force of a spring (energizing means) 55 via a writing core P and a core retention part 52 by writing pressure, and the slider 51 is rotated by a predetermined pitch in one direction around the axial line L by a feeding mechanism H1 and the writing pressure. Thereafter, when the writing core P is lifted from a paper surface during writing, the writing pressure is released, the slider 51 is caused to advance by the feeding mechanism H1 and the spring 55, and, accompanying the advance, the slider 51 is rotated by a predetermined pitch in one direction around the axial line L. The mechanical pencil implements a knock type in collaboration with a chuck part 46, a guide surface 47a of a chuck holder and a ball BL. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
