| 摘要 |
PROBLEM TO BE SOLVED: To achieve a smooth writing touch by preventing a ball seat from inclining, and also preventing the variation of a flow of ink caused by writing direction. SOLUTION: The ball-point pen tip is featured such that ink is introduced to a ball 5 set at one side of a metal thin tube 1 by an ink introduction core 9 located inside of the metal thin tube, and the ink introduction core 9 is formed with a number of grooves in the axial direction for forming capillary tubes on its exterior surface. The ink introduction core 9 inserted in the metal thin tube 1 is fastened by subjecting the metal thin tube 1 to punch riveting work 11. Then, a riveted portion is formed at the extremity of the ball-point pen tip; subsequently, the ball 5 is brought in contact with the inside of the riveted portion by the ink introduction core 9 being inserted in interior of the metal thin tube 1. |
