Pencil sharpener

A pencil sharpener for shaving a pencil inserted into the pencil sharpener, comprising:

• a torque generation means that generates rotational torque by manual rotation of a crank or by an electric motor;
• a cutter frame that includes a cutter to shave the inserted pencil and is rotated by torque generated by the torque generation means;
• a pencil biasing means that biases the pencil in an insertion direction;
• and
• a shaving stop means that stops shaving the pencil in accordance with a fully sharpened state of the pencil, and/or a shaving completion notification means, wherein
• the cutter frame is provided with a core tip detection unit for detecting a tip position of the pencil,
• the core tip detection unit rotates in conjunction with the cutter frame, and is supported in such a manner as to be capable of translating or changing an angle with respect to the cutter frame,
• a detection unit biasing means that biases the core tip detection unit in a pencil ejection direction is provided between the core tip detection unit and the cutter frame,
• a detection portion being a portion of the core tip detection unit is in a position that comes into contact with a core tip of the pencil,
• the core tip of the pencil presses the detection portion of the core tip detection unit to cause the core tip detection unit to translate or change the angle with respect to the cutter frame,
• the translation or angle change allows a rotation path of a transmission portion being a portion of the core tip detection unit to change, and
• rotational torque of the rotating transmission portion transmits that the pencil has entered a predetermined fully sharpened state to the shaving stop means and/or the shaving completion notification means.

A pencil sharpener for shaving a pencil inserted into the pencil sharpener, comprising:

• a casing;
• a torque generation means that generates rotational torque by manual rotation of a crank or by an electric motor;
• a cutter frame that includes a cutter to shave the inserted pencil and is rotated by torque generated by the torque generation means;
• a pencil biasing means that converts the rotation of the cutter frame into motion of biasing the pencil in an insertion direction or an ejection direction;
• a sharpening completion detection means that detects a fully sharpened state of the pencil;
• and
• a means that stores energy generated upon the pencil being inserted, wherein
• insertion pressure upon the pencil being inserted
• switches the pencil biasing means to convert the rotation of the cutter frame into the motion of biasing the pencil in the insertion direction, and also
• switches the pencil basing means to store energy in the means that stores energy, release the energy in conjunction with the sharpening completion detection means, and accordingly convert the rotation of the cutter frame into the motion of biasing the pencil in the ejection direction.