JPH0737905Y2 - Synthetic resin pen tip - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a pen tip of a writing instrument, and particularly to a synthetic resin pen tip that is delicate and smooth as a fountain pen and useful as a fountain pen type.

(Prior Art and Problems) A conventional extruded synthetic resin nib provided with a rib on the inner wall of an annular portion and having an ink passage in the axial direction,
The tip is in the shape of a bullet, the writing feel is hard, and you cannot expect the delicate softness like a fountain pen. However, if the centering length of the pen tip is increased, it is possible to obtain a certain delicate feeling of writing, but on the other hand, there is a serious problem that it easily breaks, and it is practically used. Not suitable.

With such a synthetic resin nib, what is considered as a means of obtaining a delicate touch like a fountain pen is that the tip is obliquely cut like the felt fountain pen described in Japanese Utility Model Publication No. 35-29542. Insert a synthetic resin pen tip into the insertion hole of the neck tube that has a protruding edge that is placed and protrudes like a tongue,
By supporting one side edge of the nib with the support edge, it is possible to obtain a certain delicate writing feeling by utilizing the elasticity of the support edge. However, this does not mean that the problem is solved, and the problem peculiar to the synthetic resin pen nib in which the rib is provided on the inner wall of the annular portion to form the ink passage in the axial direction has not been solved yet. That is, since the rib is present in a projecting shape at the tip of the cannonball shape, this rib is caught on the writing surface, and the smoothness is obstructed by the catching resistance, and eventually it is equivalent to or similar to a fountain pen. I can't get a sense of writing.

The present invention has been made in view of such circumstances, and an object thereof is an extruded synthetic resin nib in which a rib is provided on an inner wall of an annular portion to form an axial ink passage. In spite of this, it is to provide a pen tip that is as delicate and smooth as a fountain pen.

(Means for Solving the Problems) In the synthetic resin pen tip of the present invention, a rib is provided on the inner wall of the annular portion, and the extruded rod tip having an ink passage in the axial direction is attached to the axis. Cut it to the required diagonal angle,
The oblique flat surface is used as a writing surface portion, and a crack extending from the tip of the tip of the writing surface portion to the ink passage is provided to an appropriate depth in the axial direction.

In other synthetic resin nibs, the synthetic resin nib has a rib on the inner wall of the annular portion, and requires an extruded rod tip having an ink passage in the axial direction with respect to the axis. This diagonal flat surface is used as a writing surface portion, and a crack reaching from the tip of the tip of the writing surface portion to the ink passage is formed to an appropriate depth in the axial direction. Is characterized in that at least the writing surface portion is projected and integrally fixed to the tip portion of the holding body having appropriate elasticity.

Also, the slope angle of the writing surface part is 45 to 75 degrees with respect to the axis, preferably 60 degrees, and if the angle is less than 45 degrees,
If it exceeds 75 degrees, not only will the writing become cramped, but also the writing feel, elasticity, and freedom of line width will be unfavorable.

Further, the crack is formed so as to reach the ink passage through the annular portion or the rib.

The pen tip diameter is 2φ (mm) or less, preferably about 1φ.

Further, the cross-sectional structure of the ribs is free, for example
-20421, 49-20425, 49-20431, 55-7418
No. 58-35508, each rib configuration described in each publication, and other various configurations similar to these are appropriately selected.

(Operation) The writing surface portion is in a flat shape with a required slant, and is rich in elasticity according to the tip side of the writing surface portion, and this elasticity gives a delicate writing feeling. Furthermore, since the annular portion end surface is formed on the outer periphery of the writing surface portion and surrounds the end surface of the annular portion and the rib end surface that is flush, the contact with the writing surface is exclusively at the annular portion end surface, and this break and The end surface of the ring-shaped part has no irregularities for a smooth writing feel. Moreover, the cracks increase the elasticity of the writing surface, resulting in a more delicate writing feeling.

As a result, it has a delicate and smooth pen feeling similar to or close to that of a fountain pen.

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

1 to 3 exemplify a synthetic resin nib A of the first invention, in which a rod 1 of the synthetic resin nib A is extruded and has a cross-sectional structure of an annular portion 2. The ribs 4 are provided in the inner wall 3 in the centripetal direction to the extent that the projecting ends thereof do not contact each other, and the ribs 4 form the ink passages 5 in the axial direction.

The tip of the fine rod 1 is cut at a required oblique angle b with respect to the axis a, and the one oblique flat cut surface 6 is used as a writing surface 7.

The writing surface portion 7 is formed by an outer peripheral elliptical annular portion end surface 8, a rib end surface 9 which is surrounded by the annular portion end surface 8 and is flush, and an ink passage end 5a which is seen from between the rib end surfaces 9. is doing.

Further, the fine rod 1 is provided with a crack 10 extending from the tip of the tip of the writing surface portion 7 to the ink passage 5 at an appropriate depth in the axial direction.

The following Table I shows appropriate angles for the slope angle b of the writing surface portion 7.

note. The cross-sectional structure shown in Fig. 2 has a core diameter of 0.5 to 1.0φ (m
Each of m) was tested.

As shown in Table I above, the slope angle b of the writing surface portion 7 is preferably 60 degrees, and since it has the cracks 10, it is excellent as a fountain pen type in terms of all of the feeling of writing, elasticity, and the freedom to increase or decrease the line width. On the other hand, the slope angle b of 40 degrees that is less than 45 degrees and the slope angle b of more than 75 degrees that is 80 degrees are not suitable for each of the items.

The following Table II is a comparative example of the synthetic resin nib A of the present invention and the comparative example (for the felt fountain pen described in Japanese Utility Model Publication No. 35-29542) in terms of the writing area, the stroke width, and the stability of the ink flow. The test results are shown in which the felt nib is replaced with a synthetic resin nib whose tip is a bullet shape).

As shown in Table II above, the product of the present invention was superior as the fountain pen type in all of the pen feeling area, the stroke width, and the stability of the ink flow, as compared with the comparative example.

FIGS. 4 to 13 exemplify fountain pen type writing instruments B, C, D, E and F in which the product of the present invention is incorporated.

Fountain pen type writing instrument B illustrated in FIGS. 4 and 5
Then, the synthetic resin nib A is inserted into the penetrating insertion hole 12 from the front portion to the base portion of the holder 11 which is a synthetic resin integrally molded product, and is fixed with the adhesive 13. It is attached to the tip of the cylinder 14.

Fountain pen type writing instrument C illustrated in FIGS. 6 and 7.
Then, the pen tip A made of synthetic resin is inserted into the tip of the barrel 19 while being inserted into the metal tube 15 and fixed to the back side of the flat upper surface portion 17 of the metal pipe-shaped holder 16 with the adhesive 18. It is worn.

Fountain pen type writing instrument D illustrated in FIGS. 8 and 9.
Then, the synthetic resin nib A is inserted into the metal tube 20 and is attached to the back surface of the upper surface 22 of the metal pipe-shaped holder 21 by the adhesive 23.
It is inserted and attached to the front end of the shaft tube 24 in a state of being fixed.

Fountain pen type writing instrument E illustrated in Figs. 10 and 11
Then, the synthetic resin nib A is the upper surface of the metal holder 25.
26 On the back side, the tip portion 27 and the base end portion 28 of the holder are fixed at two points by caulking and are attached to the tip of the shaft tube 29.

Fountain pen type writing instrument F illustrated in Figs. 12 and 13
Then, the synthetic resin nib A is a metal pipe-shaped holder 30.
In addition, the tip side of the pen tip is the tip side 32 on the back side of the upper surface part 31, and the base side of the pen tip is caulked and fixed coaxially with the holder at the base end 33. Is attached to.

The centering length of the synthetic resin pen nib A in each of the above embodiments is 200% or less of the diameter, and preferably 130 to 150%.

Further, the tip of the holding bodies 11, 16, 21, 25, 30 in each aspect is formed to have a small diameter in the holding body 11 and a narrow width in the holding bodies 11, 16, 21, 25, 30. The part itself has an appropriate elasticity, making the writing feeling more favorable as a fountain pen type.

Further, the holders 16, 21, 25, 30 in the embodiments illustrated in FIGS. 6, 8, 10, and 12 may be made of synthetic resin, and accordingly, In the holders 25 and 30 of the embodiment shown in the drawings and FIG. 12, the caulking portion is used as a fixing means by heating or a fixing means.

In addition, in each of the embodiments illustrated in FIGS. 10 and 12, the pen tip A made of synthetic resin is inserted into a metal tube to be inserted into the holder.
It is also good to fix by caulking to 25 and 30.

In the embodiment illustrated in FIG. 4, the writing surface portion 7 can be made coaxial with the barrel 14, and in the embodiments illustrated in FIGS. 6, 8, and 10, the writing surface portion 7 is formed. The shaft cylinder 19, 24, 29
Can be eccentric with respect to, and in the embodiment illustrated in FIG. 12, the writing surface portion 7 is eccentric with respect to the barrel 34. On the other hand, the pen tip base side can be coaxial with the barrel 34.

Further, in each of the embodiments illustrated in FIGS. 10 and 12,
The internal space of the holders 25 and 30 also serves as the air holes 35, and the trouble of separately providing air holes on the side of the barrels 29 and 34 can be eliminated.

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

According to the first aspect, it is possible to obtain a delicate and smooth brush feeling equivalent to or close to that of a fountain pen, and it is possible to write with the same feeling as a fountain pen even though it is an extruded synthetic resin nib.

According to the item, the line width can be freely selected by changing the writing angle.

According to the above item, since the cut surface is the writing surface portion, there is no clogging, a stable ink flow is obtained, abrasion is remarkably improved, and the life is long as compared with the case where the conventional product is polished.

With the above item, a more delicate brush feeling due to the crack can be provided, and the degree of freedom of the line width can be selected greatly.

According to the above item, when the writing surface portion is attached to the holding body with the writing surface portion facing downward, the crack is used as a guide and the positioning is easy and easy.

According to claim 2, since the pen tip is integrally fixed to the tip of the holder having the appropriate elasticity by at least the writing surface portion protruding, the elasticity is further increased, and a more preferable writing feeling can be obtained. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an example of implementation of a synthetic resin nib of the present invention. FIG. 2 is a perspective view showing the writing surface part facing upward.
FIG. 3 is an enlarged vertical sectional view taken along the line III-III in FIG. FIGS. 4, 6, 8, 10, and 12 are side views showing other embodiments of the synthetic resin nib of the present invention, each of which is partially cut away. FIGS. 5, 7, 9, 11 and 13 are front views of the above embodiments. In the figure, 1 is a rod body 2 is an annular portion 3 is an inner wall 4 is a rib 5 is an ink passage 6 is a cutting surface 7 is a writing surface portion 10 is a crack 11, 16, 21, 25, 30 is a holder a is an axis b is oblique Horn

Claims (2)

[Scope of utility model registration request] 1. A rib is provided on an inner wall of an annular portion, and an extruded fine rod tip portion having an ink passage in an axial direction is cut at a predetermined oblique angle with respect to the axial line to form the oblique flat shape. A pen tip made of synthetic resin, which has a cutting surface as a writing surface portion, and has a single crack extending from the front end of the writing surface portion to the ink passage to an appropriate depth in the axial direction. 2. A synthetic resin pen tip is provided with a rib on an inner wall of an annular portion, and an extruded fine rod tip portion having an ink passage in an axial direction is cut at a predetermined oblique angle with respect to the axis line. Then, the cut surface of this diagonal flat surface is used as the writing surface,
The writing surface portion is provided with one crack extending from the front end to the ink passage to an appropriate depth in the axial direction,
This pen tip is a synthetic resin pen tip in which at least a writing surface portion is projected and integrally fixed to a tip portion of the holder having an appropriate elasticity.