JPH088866Y2 - Pen core for writing instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pen core for a writing instrument for deriving ink.

[Conventional technology]

Conventionally, a pen core for a writing instrument of this type has a slit-shaped ink groove for leading out ink formed in a comb groove portion formed in a straight line in the longitudinal direction.

[Problems to be solved by the device]

Therefore, when the writing instrument receives an impact or the cap is removed, the ink in the ink tank may be blown out to cause a contamination trouble.

This phenomenon may cause a problem especially in a plotter that performs high-speed writing or writing that moves up and down rapidly.

[Means for solving the problem]

The present invention forms a comb groove portion with a large number of comb teeth arranged in parallel on the outer periphery of a pen core for a writing instrument, forms slit-shaped ink grooves in the plural longitudinal directions of the comb teeth, and is aligned with the comb teeth. Slit-like ink grooves are formed in the ink receiving comb teeth described above so as not to coincide with the ink grooves of the comb teeth in the longitudinal direction. Further, the ink receiving comb teeth and the comb teeth immediately before the writing tip direction of the ink receiving comb teeth are configured not to be provided with the air replacement concave groove, and the remaining comb teeth are formed with the air replacement concave groove. It is characterized by.

[Action]

Therefore, due to impact or decompression when the cap is removed,
Ink that overflows from the ink tank flows into the comb groove, but in order to flow into the ink groove of the comb tooth, it must bypass the ink groove formed on the ink receiving comb tooth, causing a sudden movement of the ink. It is weakened during the detour and prevents the ink from blowing out.

〔Example〕

Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 6
FIG. 7 and FIG. 8 show an embodiment of the present invention, in which the comb teeth 1A, 1B, 1C, 1D, 1E, 1F.
1G is formed to form the comb groove portion 1H, and the comb teeth 1B, 1C, 1D,
Slit-shaped ink groove that matches 1E, 1F, 1G in the longitudinal direction
Form 1I. In addition, an air replacement groove 1J is formed in the comb teeth 1B, 1C, 1D, 1E, 1F at a position 180 ° inverted from the ink groove 1I so as to be aligned with the longitudinal direction and cut out. Furthermore, comb teeth 1B, 1C, 1D,
Comb teeth 1B, 1C, 1D to ink receiving comb teeth 1K, which are commonly used as 1E, 1F, 1G
-Invert the ink groove 1I formed in 1E, 1F, and 1G by 180 ° to form an ink groove 1L that does not match in the longitudinal direction. No air exchange concave groove is formed in the ink receiving comb tooth 1K and the comb tooth 1G adjacent to the ink receiving comb tooth 1K in the writing tip direction. still,
The ink receiving comb teeth need not necessarily be provided at the rearmost end adjacent to the ink tank, and one or a plurality of ink receiving comb teeth may be formed at an intermediate position of the comb teeth. Into the inner hole 1M of the pen core 1, a joint 2 having an ink passage 2A through which ink flows is press-fitted and fixed. The ink passage 2A of the joint 2 is not limited to the cross-shaped cross section shown in the drawings, and may have any shape such as a plurality of small-diameter holes as long as the ink can flow by capillary action. Further, the pen core 1 and the joint 2 may be integrally formed. Further, a synthetic resin holder 4 having a pen tip 3 made of a hard material such as ceramic at its tip is press-fitted into the tip of the pen core 1. The writing tool is completed by press-fitting the pen core 1 into the front part of the ink tank 5 storing the ink. In the ink tank 5, the ink grooves 1I and 1L, the comb groove part 1H and the air hole 1N are communicated with the outside air. Connected with.

The ink circulation hole formed in the pen tip 3 is not limited to the one having the three through holes 3A as shown in FIG.
There is no problem with one through hole.

Further, the cross-sectional shape of the ink circulation hole is not limited to a circle, and various conventionally conceivable shapes can be used.

Further, as shown in FIG. 9, the bent portion 6A of the core 6 is held by the front end of the joint 2 and the rear step 4A of the holder 4, and the rod-shaped portion 6B of the core 6 is inserted into the penetrating hole of the pen tip 13. The pen core 1 of the present invention may be used for a writing instrument inserted in 13A.

The pen core 1 for a writing instrument of the present invention configured as described above
In writing instruments provided with, during writing or when carrying,
Even if the ink in the ink tank 5 tries to flow into the ink groove 1I of the pen core 1 by impact or by removing the cap, it is weakened while bypassing the ink groove 1L by the ink receiving comb teeth 1K, and the air hole 1N. It is possible to prevent the ink from blowing out.

In high-speed writing instruments such as writing instruments for plotters, the width of the ink groove is wide in order to improve the ink flow, and there is a high possibility that ink will blow out.
By using the pen core of the present invention, it is possible to reliably prevent the ink from being blown out.

[Effect of device]

As described above, in the present invention, among the slit-shaped ink grooves formed in the comb teeth of the pen core, the ink groove formed in at least one comb tooth is configured to be inconsistent in the longitudinal direction with other ink grooves. In this way, ink is prevented from being blown out at the time of impact or when the cap is removed, and good handwriting is obtained without blur even when high-speed writing is performed.

[Brief description of drawings]

1 is a sectional view showing a writing instrument using the pen core of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. Sectional view, FIG. 4 is C- of FIG.
FIG. 5 is a cross-sectional view showing line C, FIG. 5 is a cross-sectional view showing line D-D of FIG. 1, FIG. 6 is a cross-sectional view showing line E-E of FIG. 1, and FIG. 7 is F of FIG. FIG. 8 is a sectional view taken along line F of FIG.
FIG. 9 is a sectional view showing the line -G, and FIG. 9 is a sectional view showing another embodiment of the present invention. 1 ... Pen core 1H ... Pen groove 1 comb groove 1I ... Pen core 1 ink groove 1J ... Pen core 1 air replacement groove 1K ... Pen core 1 ink receiving tooth 1L ... Pen core 1 ink groove

Claims (1)

[Scope of utility model registration request] 1. An ink receiver in which a comb groove portion is formed by a large number of comb teeth arranged side by side on the outer periphery, and slit-shaped ink grooves are formed on the plurality of comb teeth in the longitudinal direction and which are arranged in parallel with the comb teeth. Slit-shaped ink grooves that do not match the ink grooves of the comb teeth in the longitudinal direction are formed on the comb teeth, and only the remaining comb teeth except the ink receiving comb teeth and the comb teeth immediately before the writing tip direction of the ink receiving comb teeth are formed. A pen core for a writing instrument, characterized in that an air exchange groove is formed on the.