JP2544573Y2 - Ink reservoir - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is provided in a writing instrument having an ink tank that directly stores ink without absorbing it into batting or the like, and the air in the ink tank causes a temperature rise or the like. The present invention relates to an improvement in an ink storage body for temporarily storing ink pushed out of an ink tank when the ink is expanded from the pen tip or an air hole to prevent the ink from dropping from a pen tip or an air hole.

(Prior Art) As shown in FIG. 4, in a conventional ink reservoir 15, an ink guide rod 16 as shown in FIG. 5 is inserted through a center hole thereof in order to supply ink from an ink tank to a pen tip. Was.
Then, by the capillary action of the ink guide groove provided in the ink guide rod 16, the ink is guided from the ink tank to the relay core 17 and the like connected to the chip 19 held by the chip support 18 in front.

However, since such an ink guide rod 16 is a molded article made of an elongated resin or the like, it is difficult to maintain straightness, and it is difficult to insert the ink guide rod 16 into the center hole of the ink reservoir 15 at high speed and assemble it. And increased productivity, which contributed to higher costs.

Therefore, it is desirable to eliminate the need for an ink guide rod. Conventionally, as shown in Japanese Utility Model Application Laid-Open No. Sho 59-79384, for example, an axial ink groove for guiding ink is provided with a pen core (ink reservoir). (Corresponding to) has been devised.

However, if the ink groove is formed in the pen core as in this known example, the ink groove and the ink retaining groove communicate with each other, so that the ink moving through the ink groove is absorbed by the ink retaining groove on the way. As a result, there is a problem that the supply of ink to the pen tip deteriorates.

(Problems to be Solved by the Invention) Therefore, the present invention is capable of guiding ink forward from the ink tank without using an ink guide rod, and furthermore, ink is not absorbed to other places on the way and ink is not absorbed. It is an object of the present invention to provide an ink reservoir that can prevent supply deterioration.

(Means for Solving the Problems) In order to achieve the above object, the ink storage body of the present invention has a large number of ink storage grooves 10 communicating with each other on the outer peripheral portion, and directly stores ink. In the ink reservoir provided in the writing implement of (1), an ink guide groove 4 having a width small enough to exert a capillary force from the rear end to the vicinity of the front end in the axial direction is provided at a substantially central portion in the radial direction, and the ink guide is provided. The groove 4 is configured so as to be isolated from the ink storing groove 10 on the outer peripheral portion so as not to directly communicate with the groove.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

First, reference numeral 1 denotes a shaft cylinder of a writing instrument, and a rear half inner hole is formed as an ink tank 2 for storing ink as it is. The ink reservoir 3 of the present invention is installed in the front half inner hole of the barrel 1. The ink reservoir 3 has an ink guide groove 4 having a cross-shaped cross section that is thin enough to guide the ink in the ink tank 2 by capillary action from the rear end to the vicinity of the front end in a substantially central portion in the radial direction. Has formed. A number of circumferential wings 9 are arranged in the outer peripheral portion of the ink storage body 3 in the axial direction, and an ink storage groove 10 is formed between the respective wings 9 so as to have a width enough to cause a capillary phenomenon. ing. Further, an axial vertical groove 11 communicating with each ink retaining groove 10 is formed. The vertical groove 11 is also formed to have a width that causes a capillary phenomenon, and the rear end thereof communicates with the ink tank 2. The ink storage groove 10 communicates with the ink tank 2 via the vertical groove 11, but the ink storage groove 10 and the ink guide groove 4 are isolated so as not to directly communicate with each other. On the opposite side of the vertical groove 11, a cutout is formed in each wing 9 to provide an air passage 12 (see FIG. 3). In addition, the width of the ink storage groove 10 gradually increases from the rear to the front,
The capillary action is made stronger at the rear.

In the illustrated writing implement, a chip 6 is attached to the front end of the ink reservoir 3 via a chip support 5. The ink is applied to the inside of the chip support 5 and the chip 6.
And a relay core 8 formed of a fiber bundle or the like for supplying to the ball 7 held in the apparatus. The rear end of the relay core 8 is connected to the ink guide groove 4 of the ink reservoir 3 and relays the ink received from the ink guide groove 4 to the ball 7.

When the air in the ink tank 2 expands due to a temperature rise or the like,
A part of the ink is pushed out of the ink tank 2, and the pushed ink enters the ink holding body 10 through the vertical groove 11 of the ink holding body 3, and is temporarily stored therein. Ink dropping from the opening 13 and the tip of the chip is prevented.

The air port 13 communicates with the ink tank 2 through the ventilation path 12, the storage groove 10, and the vertical groove 11, and as the ink is consumed, the air enters the ink tank 2 through the above-described path.

(Effect of the Invention) The configuration of the ink reservoir of the present invention is as described above, and the ink guide groove 4 having a width small enough to have a capillary action is provided at substantially the center in the radial direction. 4, the ink is guided from the ink tank to the front relay core, etc., so that the ink guide rod used conventionally is not required, and the difficult work of inserting the ink guide rod into the center hole at a high speed and assembling the same is possible. As a result, the assemblability and quality are improved, and the number of parts is reduced, so that the cost is reduced.

Further, since the ink guide groove 4 is separated from the ink storage groove 10 in the outer peripheral portion so as not to directly communicate with the ink storage groove 10, the ink in the ink guide groove 4 is absorbed by the ink storage groove 10 and the ink supply is deteriorated. Nor.

[Brief description of the drawings]

1 is a longitudinal sectional view of the present invention, FIG. 2 is a transverse sectional view taken along line AA of FIG. 1, FIG. 3 is a transverse sectional view taken along line BB of FIG. 1, and FIG. FIG. 5 is a longitudinal sectional view, and FIG. 5 is a perspective view of a conventional ink guide rod. DESCRIPTION OF SYMBOLS 1 ... Shaft cylinder, 2 ... Ink tank, 3 ... Ink storage body, 4 ...
Ink guide groove, 5: chip support, 6: chip, 7: ball, 8: relay core, 9: wing, 10: ink storage groove, 11: shaft cylinder, 12: ventilation path, 13: air port, 14 … Shaft cylinder, 15… ink reservoir, 16… ink guide rod, 17… relay core, 18… chip support, 19… chip.

Claims (1)

(57) [Scope of request for utility model registration] An ink storage body provided in a writing implement of a system for directly storing ink, having a plurality of ink storage grooves communicating with each other on an outer peripheral portion thereof. The ink guide groove 4 is narrow enough to exert a capillary force from the rear end to the vicinity of the front end in the direction, and the ink guide groove 4 is separated from the ink storage groove 10 on the outer peripheral portion so as not to communicate directly. An ink reservoir characterized by the following.