Pen nib

Details Pen nib Pen nib

1997-04-24

1998-10-13

Walczak, David J.

Coating implements with material supply

Material flows through porous tool

Wick feed from within reservoir to tool

401266, B43K 500

Patent

active

058202854

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a pen nib having two nib elements put together and suitable particularly for calligraphy.


BACKGROUND ART

Trials have been made to form a synthetic resin pen nib which replaces a metal pen nib. A synthetic resin nib is inferior in durability to a metal nib of the same construction. Ballpoint pens for writing relatively thin lines, having no writing directionality have widely been used, and there have been only a few types of writing implements capable of drawing thick lines. There has been commercialized a fiber bundle pen capable of drawing thick lines with a light touch and characterized in compensating for low durability by reducing bearing stress induced by writing force.
Methods of forming wide synthetic resin pen nibs for calligraphy are proposed in JP-U Nos. 63-41183 and 2-28068 and JP-A No. 7-149092. These previously proposed methods weld together synthetic fibers gathered in a bundle so as to form appropriate capillaries which serve as ink passages in its cross section or grind an extruded workpiece having capillaries in its cross section to provide a pen nib having a thin tip. Each of pen nibs disclosed in those references is an aggregate of tubular bodies of various sectional shapes and is constructed so as to prevent the evaporation of the components of ink from its outer surface.
Since the tip portions of the known pen nibs are ground to form thin tips and are subjected to post-processes including a slitting process, it has been difficult to secure dimensional accuracy after processing.
A tubular nib is bent naturally when writing force is applied to the tip of the nib and, consequently, the internal capillaries (ink passages) are partly deformed. Since a nib of this kind is made by forming an elongate material of a substantially uniform cross section, the capillaries cannot be so formed that the capillaries in a nib portion near the tip of the same and the capillaries in a proximal portion of the nib near the ink reservoir are different in capillarity. Therefore, the surface tension of ink to be used by such a nib must be low in order that the ink is able to flow smoothly through the nib, and hence the spread of the ink permeating a paper sheet must be suppressed to the least extent by reducing the quantity of the ink transferred to the paper sheet. Since the quantity of the ink transferred to the paper sheet is small, the color density of the ink must be increased to enhance contrast and the color component concentration of the ink must be increased. Accordingly, the quantity of residues which remain in a tip portion of the nib after the evaporation of the evaporative components of the ink increases, and the writing performance of the pen is not satisfactory at the beginning of writing after the pen has been left unused.
Efforts must be exerted to control the components of the ink so that the ink has balanced quality to solve such problems. Since the viscosity of the ink increases as a natural consequence, the capillaries need to be expanded in the cross section and, if the sectional shape of the nib is caused to change greatly by the writing force, i.e., if the nib is very flexible, the ink is liable to flow irregularly. In order to avoid this, known pen nibs of this kind have a relatively low flexibility and give a relatively hard touch.
Since the fiber bundle nib is easily deformable, only a portion of the fiber bundle nib in contact with a paper sheet is deformed and capillaries in the same portion are deformed. Therefore, the flow of the ink is liable to vary and it is difficult to bring the tip portion of the nib into uniform contact with a writing surface. The sectional shape of a fiber bundle nib provided with a slit in its tip portion, such as disclosed in JP-U No. 2-28068, changes when writing force is applied to the fiber bundle nib, and the nib scatters the ink and vibrates to make writing difficult because a tooth-shaped portion in which the slit is formed engages with and disengages from a through hole when the nib is moved in

REFERENCES:
patent: 3843270 (1974-10-01), Kiriu et al.
patent: 4824271 (1989-04-01), Nagahama et al.
patent: 4973182 (1990-11-01), Nakano
patent: 5388924 (1995-02-01), Chao

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