| 摘要 |
PURPOSE:To prevent back leaking of ink through impulse of upward writing and upward falling or the like and to prevent leaking from a point in a downward time and blurring. CONSTITUTION:A spring 16 is energized in the inner hole of a joint tip 5 and the rear end of a tip ball 5a is pressed by the front of the spring. The tip ball 5a is freely rotatably held in the tip part of the joint tip and closely touches the inner edge of the ball-holding part of the joint tip. When the joint tip is downward, leaking from a point of ink is prevented. The rear end of the spring is not pulled out by a calking part 18 of the rear end of the tip. Furthermore a notch 19 is provided in the necessary place on the side of a barrel in the rear end of the tip. When the tip is downward, a ball valve 15 abuts on the rear end of the tip and a leading hole 20 is opened and also ink 22 flows into the inner hole of the tip through the notch. |
