Method of making a tip for a ball point pen

In a method of making a tip for a ball point pen including forming a cylindrical metallic tip body having a pointed end, a ball receiving hole having the opening thereof at the pointed end of the tip body and a bore for delivering ink to the ball receiving hole and having the opening thereof at the end of the tip body opposite to the pointed end, inserting a ball supporting seat of a plastic into the bottom of the ball receiving hole, putting a ball on the ball supporting seat in the ball receiving hole, and forming the pointed end of the tip body over the ball for holding the ball in the tip body;

• the improvement comprising the steps of, after forming the tip body;
• forming a recess in the bottom surface of the ball receiving hole,
• forming at least one protrusion in the vicinity of the upper edge of said recess,
• applying the pointed end of the tip body onto a sheet of a plastic for the ball supporting seat to thereby cut out a portion of the plastic and transfer said portion of the plastic to the opening of the ball receiving hole,
• forcing the thus cut out portion of the plastic deep into the bottom of the ball receiving hole and deforming the portion of the plastic to fill all the corners of the bottom of the hole including said recess and behind the protrusion,
• punching both a portion of the ball supporting seat and the bottom of the hole at the same time thereby forming an ink guiding groove between the ball receiving hole and the ink delivering bore through the ball supporting seat, and then putting the ball on the ball supporting surface.