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AssigneeMitsubishi Pencil Company, Limited
InventorsHirotake Izawa, Takeo Fukumoto, Noio Ohsawa, Kyo Nakayama, Yoshitoshi Osano
Estimating the term…
A chuck unit (4) for grasping a writing lead (10) and a rotor (6) arranged to be movable in a direction of rotation and an axial direction within a body cylinder (1) are provided. First and second cam faces (6a) and (6b) are respectively formed at one end face and another end face of the rotor in the axial direction, and first and second fixed cam faces (13a) and (17a) are arranged on the body cylinder side to face the first and second cam faces respectively. The first cam face in the rotor is brought into abutment with and meshed with the first fixed cam face by retreat operation of the chuck unit under writing pressure, and the second cam face in the rotor is brought into abutment with and meshed with the second fixed cam face by releasing the writing pressure, so that the rotor rotates, whereby the writing lead also rotates.
A mechanical pencil arranged to grasp and release a writing lead by reciprocation of a chuck unit provided in a body cylinder so as to inch the writing lead forward, characterized in that the chuck unit is held within the body cylinder so as to be rotatable about a lead axis in a situation where the chuck unit grasps the writing lead, a rotational drive mechanism is provided in which the chuck unit is moved forward by releasing writing pressure of the writing lead so as to rotationally drive a rotor, and rotational motion of the rotor is transmitted to the writing lead through the chuck unit.
Dependencies are inferred from the claim text.