| 摘要 |
PROBLEM TO BE SOLVED: To moderately absorb a pressing force in writing and also to effectively reduce a fatigue accumulated in an arm or a shoulder, by providing a plurality of cut grooves in directions along the central axis of a pen core part, in the circumference of the fore end part of a first pen core part holding member. SOLUTION: In the fore end part of a penpoint holding member 3, cut grooves 11 are provided at equal intervals in directions along the central axis of a pen core part 2. When a writing operation is started with a pen tilted in a direction A, the fore end part of the penpoint holding member 3 is pressed from inside at the part of a writing part 2A of the pen core part 2 and tongue piece parts 23 in the left end part are pressed and made to project outward aslant in some measure. Then the writing part 2A of the pen core part 2 tilts in relation to the original central axis X by the slant projection of the tongue piece parts 23. In this case, a tilt angle α of which the center is located at the part of the central axis X in the region where through holes 11A are positioned makes the writing operation easy relatively. The amount of the tilt angle α is varied by a pressing force impressed in the writing operation. When the writing operation is stopped, the original state is restored immediately by the elastic force of restoration of the tongue piece parts 23. |
