JP3835904B2 - Ink reservoir - Google Patents

Description

[0001]
[Industrial application fields]
The present invention has an ink chamber that directly stores ink without being occluded in the batting and the like, and when the air in the ink chamber expands due to a temperature rise or the like, the ink pushed out of the ink chamber is not dropped from the pen tip or the air hole. Therefore, the present invention relates to an ink reservoir for a writing instrument provided with an ink reservoir for temporarily retaining the ink reservoir.
[0002]
[Prior art]
In the conventional ink direct storage type writing instrument, particularly an ink reservoir for a water-based ballpoint pen, the ink in the ink chamber expands and the ink pushed out of the ink chamber passes through the vertical groove of the reservoir and is retained in the reservoir groove. The ink supplied to the pen tip passes through the guide core attached to the through hole passing through the center of the ink reservoir, is supplied to the pen tip over the center core connected to the guide core, and is pushed out of the ink chamber. The ink and the ink supplied to the pen tip passed through different flow paths.
[0003]
[Problems to be solved by the invention]
In the conventional ink reservoir, since the ink pushed out from the ink chamber and the ink supplied to the pen tip pass through different flow paths, structures for performing the respective functions are required. The structure of the body is complicated, the number of parts as a writing instrument increases, and the mold structure for forming the ink reservoir is complicated due to the passage of the ink reservoir, which is disadvantageous in terms of quality stability and cost. there were. The present invention seeks to provide an ink reservoir that solves the above problems.
[0006]
[Means for Solving the Problems]
The present invention has been realized by eliminating the need for the through hole of the reservoir and the guide core by using the ink channel supplied to the pen tip in the longitudinal groove, which is a channel for guiding the ink pushed out from the ink chamber to the reservoir groove.
[0007]
【Example】
1 to 6 show an embodiment of the present invention, which will be described in detail with reference to the drawings. The writing instrument main body has a rear portion of the shaft cylinder 1 as an ink chamber 2 and an ink reservoir 3 attached to the front thereof. The ink reservoir 3 has a plurality of circumferential grooves formed on the outer peripheral surface as a reservoir groove 4. A vertical groove 5 is formed to communicate the reservoir groove 4, and the vertical groove 5 is formed continuously to the bottom of the U-shaped groove 6 in which a part of the cylindrical portion in front of the ink reservoir 3 is cut out. Yes.
[0008]
A joint 7 is press-fitted into the portion of the ink reservoir 5 where the U-shaped groove 6 is formed, and the relay hole is formed by the bulging portion 8 of the joint 7 and the U-shaped groove 6 of the ink reservoir 3. 9 is formed, and the intermediate core 10 made of a fiber bundle or the like is inserted into the relay hole 9 with a loose press or a gap less than about the width of the longitudinal groove 5. The intermediate core 10 is press-fitted into the joint 7. The tip 11 is inserted into the tip 11 and reaches the vicinity of the ball. Note that the ridge 12 at the rear of the joint 7 forms the retention groove 4 at the front of the ink reservoir 3, so that the ridge 12 directly contacts the ink and the ink extends over the ridge 12 due to expansion wetting. The joint 7 is preferably set to have a surface tension lower than that of the ink reservoir 3 because the portion may be stained. Specifically, when the ink reservoir 3 is molded with ABS resin and treated with low temperature plasma to improve the wettability of the ink, the molded product itself is made of an ABS resin joint 7 or the surface of the ABS resin from the ABS resin. It is conceivable to use a polyolefin resin or polyacetal resin having a low tension.
[0009]
In the writing instrument configured as described above, first, the flow of ink to the tip 11 that is the pen tip reaches the bottom of the U-shaped groove 6 of the relay hole 9 from the ink chamber 2 through the vertical groove 5 of the ink reservoir 3, Further, the ink is supplied to the ball at the tip of the chip 11 over the core 10 entering the relay hole 9.
[0010]
Next, the ink pushed out from the ink chamber 2 passes through the longitudinal groove 5 and is retained in the retaining groove 4 in the same manner as the ink flowing to the tip 11 that is the pen tip. The ink stored in the storage groove 4 returns to the original ink chamber 2 through the vertical groove 5 when the air in the space of the ink chamber 2 contracts due to changes in temperature or pressure, and when ink is consumed by writing, When the ink is not pushed out due to the expansion of the space of the ink chamber 2, the ink in the retaining groove 4 is preferentially supplied to the pen tip, and the ink consumption of the pen tip further advances and the ink is lost in the retaining groove 4. When consumed, the ink in the ink chamber 2 is reduced and the air pressure in the ink chamber 2 is lowered, making it difficult for the ink to flow out of the ink chamber 2. In such a state, the vertical groove 5 extends from the storage groove 4 at the rear of the ink storage body 3. Then, air flows into the ink chamber 2 and the air pressure in the space of the ink chamber 2 returns to its original state. The rear portion of the vertical groove 5 is also filled with ink, and the ink flows smoothly through the vertical groove 5 as before. Here, the inflow of air occurs in about half of the outer side in the radial direction of the longitudinal groove 5, and the ink in the inner half is not cut off, and the ink supply to the pen tip is slightly reduced at this time, but there is no problem in practical use. .
[0011]
The protruding portion at the rear end portion of the ink reservoir 3 is formed with a vertical groove 5 at the ink introduction portion 14 so that the ink liquid level is in contact with the rear end portion of the reservoir 3 when the writing instrument is assembled. Even if the space is not available, the ink comes in contact with the ink introduction section 14, so that the ink is supplied to the pen tip through the longitudinal groove 5 even if the writing instrument is installed upward, so that the ink can be quickly written and assembled. Written inspection can be done immediately. In addition, even after the product has been shipped, the ink can be supplied to the pen tip even if it is displayed for a long time at the storefront, etc. .
[0012]
【The invention's effect】
In the writing instrument configured as described above, the ink flow path for going from the ink chamber 2 to the storage groove 4 and the flow path for supplying ink to the pen tip are combined in the vertical groove 5 of the ink storage body 3. Therefore, there is no need to form a through hole in the ink reservoir 3, the structure of the mold for making a molded product becomes simple, and the ink is supplied to supply the ink from the ink chamber 2 to the pen tip. A separate member for passing through the longitudinal groove 5 is not necessary, and the cost of the ink reservoir 3 and the writing instrument body can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a writing instrument of the present invention.
FIG. 2 is a longitudinal sectional view of FIG. 1 taken along AA.
3 is a cross-sectional view taken along the line BB in FIG.
4 is a view taken in the direction of arrow C in FIG.
FIG. 5 is a longitudinal sectional view of a single body of the ink reservoir of FIG.
6 is a view on arrow D in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Ink chamber 3 Ink storage body 4 Retaining groove 5 Vertical groove 6 U-shaped groove 7 Joint 8 Bulging part 9 Relay hole 10 Core 11 Tip 12 鍔 13 Ink 14 Ink introduction part

Claims (1)

In a writing instrument having an ink chamber for directly storing ink at the rear of the shaft tube and having an ink reservoir mounted in front of the shaft tube, the vertical groove is a U-shaped groove in the front portion from the rear end in the axial direction. The end surface of the ink reservoir is further extended to reach the bottom of the U-shaped groove, communicates with a retention groove that intersects substantially at right angles, and a joint is press-fitted to the front portion of the ink retention body. The rear part of the center core is attached to the relay hole formed by the groove and the joint bulge, and the ink in the ink chamber passes through the longitudinal groove to reach the relay hole, crosses the center core, and supplies ink to the ball at the tip of the chip. An ink reservoir that is characterized by

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