JPH0638708Y2 - Plastic nib - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a nib for a fine wire having a line width of about 1.0 mm or less, and more particularly to a plastic nib having a hard writing feeling similar to an aqueous ballpoint pen.

(Prior art) Compared to oil-based ballpoint pens, water-based ballpoint pens do not have ink accumulation in the ball portion, and on top of that, they have the same hard-writing feel as oil-based ballpoint pens, and they can write and copy, and the ball rotates. Writing is possible within the writing angle range.

On the other hand, in felt-tip pens and the like, whose pen core is made of plastic, it has a soft writing feeling as well as not being able to store ink in the writing tip portion, and it is possible to write with a soft touch. It has various manufacturing and economic advantages.

(Problems to be solved by the invention) By the way, since the water-based ballpoint pen has a structure in which the ink is drawn out and transferred to the writing surface as the ball rotates, the ball angle is limited to the range in which the ball can rotate. In addition, the line width becomes narrow and becomes inconsistent due to the decrease of the contact surface of the ball with the writing surface in proportion to the deepening of the writing angle. There is a disadvantage.

Further, Japanese Utility Model Publication No. 61-164784 discloses a pen body in which a small hemispherical portion at the tip of a pen core is projected from a holder. This type also has a hemispherical shape similar to a ballpoint pen. Since there is only a small portion of the projection protruding, the writing angle is limited, and the line width becomes narrow and constant as the contact surface of the ball against the writing surface decreases in proportion to the deepening of the writing angle. It has the same inconvenience as a ballpoint pen such as not doing.

Further, the felt-tip pen has a low bending strength in combination with the material surface because the centering length L of the tip of the pen core protruding from the holder is L / D = 1.1 or more with respect to the diameter D. However, there is a problem peculiar to a plastic nib in that it is not possible to expect a hard-brushed feeling and copy writing is impossible.

Moreover, since the tip of the writing brush is approximately bullet-shaped, the contact surface area of the writing tip changes with the writing angle, and the line width becomes thicker as the writing angle gets deeper.
There is also a problem that the line edge is disturbed depending on the degree, and it is more remarkable because the writing part is flexible.

The present invention has been made in view of such circumstances, and it has a hard-writing feeling and can copy and write as much as a ball-point pen, and has a constant line width with almost no writing angle restriction and a line without disturbance. It is possible to write on the edges, which is advantageous in terms of production and economy, and not only is the writing feeling mere hard writing feeling, but also the hard writing feeling and elasticity where it has a smooth writing feeling based on moderate elasticity to supplement the hard writing feeling. An object of the present invention is to provide a new plastic nib that has a smooth writing feel based on it.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a metal holder and an ink capillary passage in the axial direction and has a diameter of 1.5 mm.
It consists of a plastic pen core that is the following, inserts the base of the pen core into the holder and leaves the core diameter part at the tip of the holder protruding from the tip of the holder, forming the tip of the writing brush in a hemispherical shape. Moreover, the centering length L of this tip portion is 0 of the core diameter D.
It is characterized in that the configuration is set to 8 ≦ L / D ≦ 1 or less.

(Operation) The base of the pen core is surrounded by a metal holder, which has a strong structure. Then, the pen tip portion of the tip is formed in a hemispherical shape, leaving the core diameter portion in the penetrating tip portion from the tip portion of the holder, and the centering length L of this tip portion is 0.8 ≦ L / D ≦ of the core diameter D. 1
Since it is set as follows, the bending strength is as high as that of a ballpoint pen, and the writing tip portion comes into contact with the writing surface at the same area of the substantially circular contour at any contact portion. Moreover, the core diameter portion works as an appropriate elastic portion to supplement the hard feeling similar to that of a ballpoint pen at the tip portion, and makes the tip portion have a smooth writing feel.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

In the figure, A is a nib, which has a metal holder 1 and an ink capillary passage 3 in the axial direction, and has a diameter D.
Is 1.5 mm or less, and the base 2a of the pen core 2 is inserted into the insertion hole 4 of the holder 1 and the core diameter portion of the penetrating tip 2b from the holder tip 1a is inserted. Remaining, the pen tip portion of the pen core 2 at the tip is formed in a substantially hemispherical shape, and the centering length L of the tip portion 2b is 0.8 ≦ L of the core diameter D.
/ D ≦ 1 or less is set.

The insertion state of the pen core 2 into the holder 1 is in addition to the coupling relationship by the interference fit, in addition to the tip portion 1a and the base end portion 1b of the holder 1.
Crim the pen core 2. Alternatively, as shown in FIG. 3, the tightening portion 1c of the holder 1 may be punched and the protrusion 1d may be connected to the pen core 2.

The capillary passage 3 in the pen core 2 is extruded and has, for example, a cross-sectional structure in which ribs are radially expanded from the center and a cross-sectional structure in which the ribs extend from the inside of the ring toward the center.

The brush tip of the tip 2b is ground into a hemispherical shape, and the centering length from the holder tip 1a is 0.8 ≦ L / D ≦ 1 or less, and the tapered holder tip 1a and the tip 2b. Is arranged to closely resemble the shape of the tip of a ballpoint pen.

The following table shows the bending load and the number of copies of the invention products I and II and comparative examples III, IV, V and VI.

Holder material: Free-cutting brass steel Pen core material: Polyoxymethylene As described above, the product of the present invention has a better load per unit area than the comparative example, and the number of copies is similar to that of a ballpoint pen. .

FIG. 17 is a graph showing the numerical values of the product of the present invention and the comparative example with respect to the limit load per unit area in the table above, and the difference in performance between the product of the present invention and the comparative example is represented by the attenuation straight line.

(Effect of device) Therefore, according to the present invention, there are the following advantages.

Even though it is a plastic pen core, it has a hard writing feel similar to a ballpoint pen, and it can be copied and written to the same extent as a ballpoint pen.

It is possible to write with a constant line width, with almost no limitation on the writing angle, and to write in a state where the line edges are not disturbed and the line ends are round.

The structure eliminates the need for balls, which is advantageous in terms of production and economy.

The tip of the pen tip is formed in a hemispherical shape, leaving the core diameter portion at the tip of the holder protruding from the tip of the holder, and the centering length L of this tip portion is 0.8 ≦ L / D ≦ 1 or less of the core diameter D. Since the core diameter portion functions as an appropriate elastic portion, the writing feeling is not only hard feeling but also has a characteristic that it complements the hard feeling and has a smooth writing feeling based on moderate elasticity. .

It has a structure that looks very similar to a ballpoint pen,
The ball-pointed form has the effect of visually having a commercial value like a ball-point pen.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the plastic pen tip of the present invention. Fig. 2 is an enlarged cross-sectional view along the line II-II. FIG. 3 is a vertical sectional view showing another embodiment. Fig. 4 is an enlarged cross-sectional view along line IV-IV. 5, FIG. 7, FIG. 9, and FIG.
Figures 13, 13 and 15 are front views showing other embodiments.
FIG. 6 is a bottom view of FIG. 5, FIG. 8 is FIG. 7, FIG. 10 is FIG. 9, FIG. 12 is FIG. 11, FIG. 16 is FIG. First
Figure 14 is a cross-sectional view taken along the line XIV-XIV in Figure 13. FIG. 17 is a graph showing the limit load per unit area. In the figure, 1 is a holder 1a is a tip 2 is a pen core 2a is a base 2b is a tip 3 is a capillary passage

Claims (1)

[Scope of utility model registration request] 1. A metal holder and a plastic pen core having a capillary passage for ink in the axial direction and having a diameter of 1.5 mm or less. The base of the pen core is inserted into the holder and the tip of the holder is attached. The tip of the pen tip is formed in a hemispherical shape, leaving the core diameter portion in the protruding tip portion, and the centering length L of this tip portion is set to 0.8 ≦ L / D ≦ 1 or less of the core diameter D. A plastic pen nib.