Penpoint assembly and writing instrument employing the same

A penpoint assembly comprising:

• a metal penpoint made of a bent metal plate having a bent portion at one end thereof thereby forming a writing tip, said metal penpoint being tapered toward the rear end of said writing tip and provided with a slit extending in said writing tip from said rear end of said writing tip along the center line in the longitudinal direction of said penpoint to a front end of said writing tip, said bent portion being formed of small projections of said metal plate at both sides of said slit, wherein said projections are bent opposite to and substantially parallel to one another, a small space being formed inside said bent portion,
• an ink guide core extending under said slit in the axial direction of said assembly into said small space and communicating at the tip of said core with said slit, and
• a support member for supporting said metal penpoint and said ink guide core, wherein said slit extends only from the front end of said bent portion to the rear end of said bent portion, wherein said ink guide core is made of a plastic rod having a capillary opening extending in the axial direction of said rod.

A penpoint assembly comprising:

• a metal penpoint made of a bent metal plate having a bent portion at one end thereof thereby forming a writing tip, said metal penpoint being tapered toward the rear end of said writing tip and provided with a slit extending in said writing tip from said rear end of said writing tip along the center line in the longitudinal direction of said penpoint to a front end of said writing tip, said bent portion being formed of small projections of said metal plate at both sides of said slit, wherein said projections are bent opposite to and substantially parallel to one another, a small space being formed inside said bent portion,
• an ink guide core extending under said slit in the axial direction of said assembly into said small space and communicating at the tip of said core with said slit, and
• a support member for supporting said metal penpoint and said ink guide core, wherein said slit extends only from the front end of said bent portion to the rear end of said bent portion, wherein said ink guide core is made of polyester fibers fixed to each other by a resin and having a porosity of substantially 60%.

A penpoint assembly comprising:

• a metal penpoint made of a bent metal plate having a bent portion at one end thereof thereby forming a writing tip, said metal penpoint being tapered toward the rear end of said writing tip and provided with a slit extending in said writing tip from said rear end of said writing tip along the center line in the longitudinal direction of said penpoint to a front end of said writing tip, said bent portion being formed of small projections of said metal plate at both sides of said slit, wherein said projections are bent opposite to and substantially parallel to one another, a small space being formed inside said bent portion,
• an ink guide core extending under said slit in the axial direction of said assembly into said small space and communicating at the tip of said core with said slit, and
• a support member for supporting said metal penpoint and said ink guide core, wherein said slit extends only from the front end of said bent portion to the rear end of said bent portion, wherein the length of said slit is substantially 1.2 mm.