JP3698792B2 - Writing instrument - 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 a guide core for drawing out ink of a writing instrument provided with an ink reservoir for temporarily retaining the ink.
[0002]
[Prior art]
In order to draw ink from the ink chamber of a conventional direct storage type writing instrument to the pen tip, a guide core provided with an ink flow path is attached to the inner side of the central hole of the reservoir, and ink is drawn from the ink chamber to the pen tip. Or a core made of a fiber bundle or the like is connected between the pen tip and the guide core, and ink is supplied from the ink chamber to the center via the guide core and led to the pen tip.
[0003]
[Problems to be solved by the invention]
The assembly in the conventional direct storage type writing instrument is as follows. After the shaft cylinder is faced upward and filled with ink, and after the storage body in which the pen tip, the lead core, and the like are incorporated is incorporated in the shaft cylinder, immediately. An initial ink discharge process is performed by sucking the pen tip with the writing tip portion downward. This is produced by extruding the ink guide core with a gap communicating therewith, but when the ink guide core is made of polyacetal resin, it is made of ABS resin that has been treated to improve the wettability of the ink. When the pen tip is lowered immediately after assembly, the ink comes into contact with the rear part of the retaining body and the rear part of the ink guiding core. At this time, the capillary force of the retaining groove of the retaining body is reduced to the capillary of the ink guiding core. Since the ink is stronger than the force, the ink is drawn to the storage groove first, the ink chamber becomes negative pressure, air enters the ink chamber from the pen tip through the guide core, and the ink chamber becomes the initial pressure. For this reason, the ink is further drawn into the retaining groove. Then, the ink chamber also becomes negative pressure, and air flows from the pen tip through the ink guide core into the ink chamber. By repeating the above phenomenon, ink enters the reservoir from the beginning of assembly, and the original performance of the reservoir cannot be exhibited, and the risk of ink blowing out due to temperature rise or the like increases.
[0004]
For this reason, after assembling the storage body into the shaft cylinder, the tip of the writing head is immediately turned downward to suck the pen tip and perform the initial ink discharge process so that the gap between the guide cores is filled with ink and the air is It is necessary to prevent the ink from flowing into the ink chamber through the ink guide core. As a result, the assembly process becomes complicated and the structure of the assembly machine becomes complicated, resulting in problems such as unstable productivity and quality. Also, if the pen tip is aspirated and the ink is reliably drawn out to the tip of the brush, excess ink will inevitably come out to the tip of the tip, and the excess ink will adhere to the part other than the tip of the tip and make the pen tip look worse. Inconveniences such as dropping on the paper also occur.
[0005]
An object of the present invention is to provide a writing instrument that does not require initial ink discharge by sucking the nib downward with the nib facing down immediately after assembly.
[0006]
[Means for Solving the Problems]
The maximum capillary width formed by the gap communicating with the inside of the ink guide core of the writing instrument of the present invention devised to achieve the above object is formed smaller than the minimum groove width of the storage groove, and the storage groove By making the ink stronger than the pulling force of ink, the ink is not drawn into the storage groove and the ink is naturally led out to the pen tip without sucking the pen tip and performing the initial ink discharge process. .
[0007]
【Example】
FIG. 1 shows an embodiment of the present invention, which will be described in detail with reference to the drawings. The writing instrument body has an ink chamber 2 at the rear of the shaft cylinder 1 and a front groove 4 formed on the outer peripheral surface of the writing tube body as a retaining groove 3, and a longitudinal groove 4 communicating with the retaining groove 3 is formed. The vertical groove 4 communicates with the ink chamber 2, and the ink reservoir having a role of retaining the ink pushed out of the ink chamber 2 due to a temperature rise or the like through the vertical groove 4 in the retention groove 3. 5 is installed. Further, an ink guide core 7 is inserted into a longitudinal hole 6 penetrating in the axial direction at the center of the ink reservoir 5, and the tip of the ink guide core 7 abuts or sticks to the center core 8. Is connected to the tip 10 of the tip, and the ink passes through the ink guide core 7 to the center core 8 and is supplied from the ink chamber 2 to the tip 10. The ink reservoir 5 is formed of ABS resin, and the ink does not get wet as it is, so that the wettability modification process using plasma is performed.
[0008]
Here, the ink guide core 7 is formed by extrusion molding of polyacetal resin, and as shown in FIG. 4 or FIG. 5, a substantially radial gap is formed in the longitudinal direction of the ink guide core 7 to form a capillary and an ink flow path 14. It has become. The maximum width of the capillary of the ink guide core 7 (for example, L in the case shown in FIG. 4 and M in the shape shown in FIG. 5) L or M is set to be less than the minimum width N of the retaining groove 3. Capillary force is stronger than the retention groove 3. For example, if the minimum width N of the retaining groove 3 is 0.2 mm, the maximum width L or M of the capillary is less than 0.2 mm, preferably 0.15 mm or less. The ink guide core 7 has a conical shape at both ends, the rear end is easy to absorb ink, and the front end is pierced into the center core 8 and connected to the center core 8 so that the ink passes from the ink chamber 2 through the ink guide core 7 to the center core 8. It is derived to the transition pen tip 10. The ink guide core 7 has an outer diameter that is tightly fitted so that air does not flow into the ink chamber 2 when ink comes into contact with the rear portion of the through hole 6 of the reservoir 5 for the first time immediately after assembly.
[0009]
FIG. 2 shows another embodiment in which the tip of the ink guide core 11 is directly connected to the pen tip 12, and the ink in the ink chamber 13 is led out to the pen tip 12, which is basically the same as the above embodiment. It is.
[0010]
[Action]
In the writing instrument configured as described above, the assembly is performed with the shaft cylinder 1 facing upward and filled with ink, and then the ink reservoir 7 including the pen nib 10 and the ink guide core 7 is incorporated into the shaft cylinder 1. After that, if the pen tip 10 is turned downward or sideways, the ink contacts the rear end portion of the ink reservoir 5 and the rear end portion of the ink guide core 7, but the reservoir groove 3 of the ink reservoir 5. The largest capillary in the flow path 14 of the ink guide core 7 (in the capillary of the flow path 14) than the force of drawing ink by the smallest capillary (the retention groove 3 having the strongest capillary force in the retention groove 3). Since the force of pulling ink by the weakest portion of the capillary force is configured stronger, the ink does not enter the retaining groove 3 but enters the ink guide core 7 and naturally leads to the pen tip 10 through the center core 8. Is done.
[0011]
【The invention's effect】
The construction and operation of the present invention are as described above. In assembling the writing instrument, the shaft tube is faced upward and filled with ink, and then a retaining body in which a pen tip, a lead core, etc. are incorporated is incorporated in the shaft tube. After that, even if the writing tip is immediately turned downward and the pen tip is sucked to perform the initial ink discharge process, if the ink is drawn downward or sideways, the ink is naturally drawn without being drawn into the storage groove of the storage body. Is led to the tip of the nib. Therefore, the assembly process is simplified and the structure of the assembly machine is simplified, so that productivity and quality are stabilized. In addition, since excess ink does not come out at the tip of the pen tip due to ink discharge, excess ink will not adhere to the tip of the pen and make the pen tip look worse. There is no inconvenience such as dropping.
[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 a writing instrument according to another embodiment.
3 is a cross-sectional view taken along the line AA in FIGS. 1 and 2. FIG.
4 is a cross-sectional view of the ink guide core of FIGS. 1 and 2. FIG.
5 is a cross-sectional view of another embodiment of the ink guide core of FIGS. 1 and 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Ink chamber 3 Retention groove 4 Vertical groove 5 Ink retention body 6 Vertical hole 7 Ink guide core 8 Center core 9 Pen tip support 10 Pen tip 11 Ink guide core 12 Pen tip 13 Ink chamber 14 Flow path

Claims (1)

There is an ink chamber for directly storing ink at the rear of the shaft cylinder, and an ink reservoir is mounted in front of the cylinder, and the ink reservoir is a reservoir that is a circumferential groove formed on the outer peripheral surface. A groove and a longitudinal groove that communicates with the retaining groove are formed. The longitudinal groove communicates with the ink chamber, and the ink is led out from the ink chamber to the pen tip through a through hole formed in the center of the reservoir. In an ink direct storage type writing instrument provided with a guide core for performing the operation, the ink guide core made of polyacetal resin does not flow into the ink chamber when the ink comes into contact for the first time immediately after assembly in the rear part of the through hole of the reservoir. When the minimum retention groove of the ink reservoir made of ABS resin whose wettability has been improved is close to 0.2 mm, the induction core made of polyacetal resin The maximum width of the capillary of the ink flow path provided in the less than m, preferably writing instrument ink direct reservoir system, characterized in that set to 0.15mm or less.

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