JPS6132790Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ink guide mechanism that can be applied to various writing instruments such as felt pens and ballpoint pens.

Conventionally, various structures have been proposed for the ink guide mechanism in felt pens, etc., but no one has developed a system that satisfies both the functions of supplying ink smoothly from the ink reservoir to the writing tip and preventing dripping. There was nothing to be satisfied with.

In view of these points, the present invention provides an ink guide mechanism that allows ink to be smoothly supplied during writing, and also holds ink when it expands to prevent it from dripping.

In the present invention, protrusions that are continuous in the circumferential direction are formed in a spiral shape or a plurality of annular protrusions are arranged side by side on the outer periphery of a cylindrical body that has an ink guiding part inside,
The protrusion is formed so that its width gradually becomes narrower from the base to the tip, and the cylindrical body is formed with a slit in the axial direction that reaches the tip of the protrusion. The width of the slit is smaller than the distance between the bases of the protrusions, and the width of the slit becomes narrower as it approaches the center.

Hereinafter, the present invention will be explained with reference to drawings of embodiments. In Figs. 1 to 3, 1 is a writing instrument main body, 2 is a cylindrical body, and 3 is an ink reservoir. An ink guiding core 4 is inserted into the cylindrical body 2, and the tip thereof serves as a writing part. On the outer periphery of the cylindrical body 2, a plurality of protrusions that are continuous in the circumferential direction, that is, annular protrusions 5 are arranged side by side. In the drawing, a plurality of annular projections 5 are arranged side by side, but the annular projections may have a continuous shape, that is, a spiral projection. The annular protrusion 5 is formed so that its width gradually narrows from its base to its tip,
Further, a slit 6 is formed in the cylindrical body 2 in the axial direction, reaching the tip of the projection 5.

7 is an air hole formed in the cylindrical body 2, 8 is an air hole formed in the main body 1, and 9 is a notch formed in the protrusion 5 for smooth air circulation in the axial direction of the cylindrical body 2. It is something. The protrusions 9 may be continuously formed only at fixed positions in the circumferential direction, or their positions may be changed for each protrusion as shown in FIG.

The distance D between the bases of the projections 5 is set smaller than the distance C between the tips of the projections, and the width E of the slit 6 is set smaller than the distance C between the tips of the projections.
is set narrower than the distance D between the bases. The width of the slit 6 may be uniform throughout, or may become narrower as it approaches the center. These dimensions are, for example, the width E of the slit from 0.15 to 0.25.
mm, the distance D between the bases is 0.25 to 0.35 mm, the distance C between the tips of the protrusions is 0.7 to 0.8 mm, the width B of the tips of the protrusions is 0.5
~0.6mm, the distance A between the inner surface of the main body and the tip of the protrusion is 0
It should be about 1.2mm. Note that the notch 9 and the air hole 7 do not necessarily have to be formed.

When writing with the writing instrument configured as described above, the ink in the ink reservoir is guided to the tip through the ink guide wick 4, and as the ink is consumed, the ink is guided through the slit 6.
And air is supplied from the air hole 7 to help the ink to be drawn out smoothly. Further, if excess ink is drawn out, it is sent out from the slit 6 into the V-shaped groove between the protrusions 5, thereby preventing dripping. The ink sent into the grooves between the protrusions 5 is always drawn toward the center by capillary action because the grooves are formed so that the closer they get to the center, the narrower the width becomes.
Therefore, it is held near the bottom of the groove without spreading to the outer periphery. That is, in the above structure, the groove width is narrower at the base than at the outer periphery of the protrusion 5, and the width of the slit 6 is narrower than that, so that the ink sent out always flows through the slit 6 and the protrusion. It is held near the bottom of the groove between the two. Further, since the slit 6 is formed so that its width becomes narrower toward the center (closer to the center), the force of drawing ink toward the center due to the capillary phenomenon is strengthened. Note that the width of the slit 6 may be set to be the same as the width between the bases of the protrusions 5, and the effect is the same in that case as well.

The ink held in the slit 6 and the groove between the protrusions is supplied from the slit 6 to the ink guide wick 4 by the reduced pressure in the ink reservoir 3 or by consumption of the ink by writing. At this time, the width is narrower at a position closer to the ink guide wick 4, and therefore the ink holding force is stronger, so that the ink is returned to the ink guide wick 4 smoothly.

FIG. 4 shows a ballpoint pen nib 10 disposed at the tip of the ink guiding core 4, and the other configurations are the same as those in FIGS. 1 to 3. Further, in FIG. 5, a small-diameter pipe 12 is provided at the writing tip, a cleaner wire 11 is inserted into the pipe, and a weight 13 thereof is inserted into the cylindrical body 2. 15 is a stopper for the weight. This weight 13 and the ink guiding core 4 do not necessarily have to be arranged over the entire area where the protrusions are formed, and may be placed only in a part of the area, or they may not be placed in that area at all. Good too. The functions and effects of the configurations shown in FIGS. 4 and 5 are the same as those shown in FIGS. 1 to 3.

As explained above, the present invention uses an ink guide mechanism that strongly retains excess ink in the groove formed by the annular protrusion, thereby ensuring that the ink is always guided to the tip of the writing instrument at a constant level. It is highly practical and can be applied to a variety of writing instruments.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figure is a cross-sectional view thereof, FIG. 3 is a vertical cross-sectional view of the annular projection, and FIGS. 4 and 5 are vertical cross-sectional views showing different embodiments. DESCRIPTION OF SYMBOLS 1... Main body, 2... Cylindrical body, 3... Ink reservoir, 4... Ink guide core, 5... Annular projection, 6...
...slit, 7, 8... air hole.

Claims (1)

[Scope of utility model registration request] On the outer periphery of a cylindrical body having an internal ink guiding section, protrusions that are continuous in the circumferential direction are formed in a spiral shape or a plurality of annular protrusions are arranged in parallel, and the protrusions have a width that gradually increases from the base to the tip. The cylindrical body is formed with a slit in the axial direction that communicates with the insertion hole and reaches the tip of the protrusion,
An ink guide mechanism characterized in that the distance between the bases of the protrusions is narrower than the distance between the tips of the protrusions, and the width of the slit is smaller than the distance between the bases of the protrusions, and becomes narrower as it approaches the center. .