Mitsubishi Pencil Company, Limited

Takamasa Fukuda

Yusuke Koizumi

A mechanical pencil includes a ball chuck, a rotation drive mechanism having a rotary part, a feedout cam face having a step part in the axial direction, an input member rotating upon receiving a rotational drive force of the rotary part, and an output member having an abutting part abutting against the feedout face and a slider provided with a holding chuck holding lead, the abutting part moves along the feedout face corresponding to rotation of the output member and so that advancing motion of the slider when the abutting part drops into the drop difference causes lead held by the holding chuck to be pulled out by the ball chuck, and further including a clutch mechanism transmitting rotational movement of the input member to the output member.

Mechanical pencil

A mechanical pencil includes a ball chuck, a rotation drive mechanism having a rotary part and receiving an axial direction retraction operation due to writing pressure received by the lead held by the ball chuck and an axial direction advance operation due to release of the writing pressure to drive the rotary part to rotate in one direction, a feed cam face having a ring-shaped cam face vertical to the axial direction and an axial direction step part, and a slider having an abutting part abutting against the feed cam face and a holding chuck holding a lead and rotating upon receiving a rotation drive force of the rotary part, which is configured so that the lead held by the holding chuck is pulled out from the ball chuck due to the advance operation of the slider.

Growing community of inventors

Tokyo, Japan

Takamasa Fukuda