| 摘要 |
A mechanical pencil has a chuck unit (4) for holding a writing lead (10) and also has a rotor (6) movable in both the rotatinal and axial directions in a barrel (1). First and second cam surfaces (6a, 6b) are formed on surfaces at axially one end and the other end of the rotor. Also, first and second fixed cam surfaces (13a, 17a) are disposed on the barrel side so as to face the first and second cam surfaces, respectively. When the chuck unit is moved backward by writing pressure, the first cam surface of the rotor is abutted on and engaged with the first fixed cam surface, and when the writing pressure is removed, the second cam surface of the rotor is abutted on and engaged with the second fixed cam surface, rotating the rotor to in turn rotate the writing lead. Thus, the mechanical pencil is provided, having a rotating and driving mechanism enabling the writing lead to rotate by the use of the writing pressure. |
