| 摘要 |
PROBLEM TO BE SOLVED: To prevent a direct flow and a reverse flow of ink, blur after upward writing or impact and to prevent the direct flow of the ink even if a tip ball is dropped due to influence of unreasonable writing or dropping impact in a ballpoint pen using low viscosity ink. SOLUTION: A holder 10 is provided at an end of a joint 3, and a bearing seat 5b is provided substantially at its rear end. A spring 17 is urged forward in the state that a rear end of a winding part is brought into contact with a rear step of a rear inner hole, the winding part is disposed in the rear inner hole, and a straight bar shaft 17a is extended ahead of the winding part. The shaft is passed through a tip inner hole to press a back surface of a tip ball 5a by the tip of the shaft to bring the tip ball into close contact with an inner edge of a ball enclosing part of the tip to prevent ink from being discharged. And, a contact part 20a is provided at substantially rear en position of the shaft to form a gap for feeding the ink between a receiving seat and the contact part. And at the time of dropping the tip ball, the contact part is brought into contact with the seat to prevent the direct flow of the ink. |
