JP3327693B2 - Writing implement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an ink tank for directly storing ink without absorbing it into a batting or the like, and a pen for discharging ink ejected from the ink tank when the air in the ink tank expands due to a temperature rise or the like. The present invention relates to an improvement in an ink guide core for drawing ink out of a writing implement provided with an ink storage body for temporarily storing ink so as not to drop from a tip or an air hole.

[0002]

2. Description of the Related Art To draw ink from an ink tank of a conventional direct storage type writing instrument to a pen tip, an ink guide core provided with an ink flow path is provided in a through hole of an ink storage body.
The end of the ink guide core is brought into contact with the core made of a fiber bundle or the like attached to the rear part of the pen tip, or the end is made into a conical shape, and the ink is supplied from the ink tank to the core and drawn out to the pen tip. The ink guide core was press-fitted and fixed in the through hole of the ink reservoir.

[0003]

In the above-mentioned conventional direct storage type writing implement, the ink guide core is fixed by press-fitting into the ink storage body, so that when an impact or the like is applied to the writing implement, the ink guide core moves. When the ink guide core moves backward, the connection of the ink guide core with the front core is released, and supply of ink to the core cannot be performed. Also, when moving forward, the core is pushed forward and the tip of the core contacts the ball of the chip to inhibit the rotation of the ball, or the ink flow to the ball is reduced by narrowing the appropriate ink flow path between the ball and the core. The supply was declining. Also, if the press-fitting of the ink guide core into the through-hole of the ink reservoir is increased, the through-hole of the ink reservoir may crack,
In general, the ink reservoir and the ink guide core are made of resin. Even if these are firmly fixed by press-fitting, the press-in force weakens due to the creep phenomenon over time, and it cannot be fixed more than a certain level. Was occurring.

[0004]

In order to achieve the above object, an ink guide core of a writing instrument according to the present invention has a small diameter portion provided at a rear portion of a through hole of an ink storage body. A peripheral groove and a small-diameter portion are formed at the rear portion, and the front edge of the peripheral groove is brought into contact with a step formed by the small-diameter portion of the through hole of the ink reservoir to regulate the rearward movement of the ink guide core. Further, the trailing edge formed by the small diameter portion of the ink guide core and the circumferential groove is brought into contact with the rear portion of the small diameter portion of the through-hole so as to regulate the forward movement of the ink guide core.

[0005]

FIG. 1 shows an embodiment of the present invention, which will be described in detail with reference to the drawings. The main body of the writing implement has an ink chamber 2 at the rear of the barrel 1 and a large number of storage grooves 3 on the outer peripheral surface in front.
And an ink reservoir 5 having a longitudinal groove 4 for communicating the reservoir 3 with the ink reservoir 5. An ink guide core 7 is inserted through a through hole 6 which penetrates the center of the ink reservoir 5 in the axial direction. Further, the tip of the ink guide core 7 abuts or stabs on the center core 8, and the center core 8 is connected to the tip of the pen, and the ink is transferred to the ink guide core 7.
, And is supplied to the pen tip from the ink chamber 2 across the core 8.

Here, the ink guide core 7 is a rod-shaped member having a substantially radial cross-section as shown in FIG.
To facilitate connection to the core 8 and stabilize the transfer of the ink to the core 8. The rear portion has a circumferential groove 15 and a small diameter portion 10, and the front edge 13 of the circumferential groove 15 holds the ink. The ink guide core 7 is moved backward by contacting a step 17 formed by the small diameter portion 16 of the through hole 6 of the reservoir 5, and is formed by the small diameter portion 10 and the circumferential groove 15 of the ink guide core 7. The rear edge 14 made in contact with the rear portion of the small diameter portion of the through hole 16 restricts the ink guide core from moving forward. Here, the small diameter portion 10 of the ink guide core 7 is made slightly larger (about 0.01 to 0.2 mm) than the small diameter portion 16 of the ink storage body 5, and the groove diameter of the circumferential groove 15 is Is smaller than the diameter of the small diameter portion 16 and the width thereof is equal to or slightly larger than the width of the small diameter portion 16 of the ink reservoir 5 (about 0.1 to 0.5 mm). Here, if the width of the peripheral groove 15 is wider than the width of the small diameter portion 16 of the through-hole 6, when an impact is applied, the ink guide core 7 moves forward by the difference between the width of the peripheral groove 15 and the small diameter portion 16; If the difference is about the difference, the movement is absorbed by the core 8 and the core 8 does not move. Next, when the ink guide core 7 is attached to the ink reservoir 5, the ink guide core 7 is inserted and pressed from the front of the through hole 6 so that the small diameter portion 10 of the ink guide core 7 is elastically attached to the small diameter portion 16 of the through hole 6. The ink guide core 7 is passed while being deformed.
The ink guiding core 7 can be mounted at an appropriate position with respect to the ink storage body 5 by contacting the front edge 13 of the base member with the step 17 of the through hole. Here, the difference between the base diameter of the ink guide core 7 and the small diameter portion 16 of the through hole 6 is formed sufficiently larger than the difference between the small diameter portion 10 of the ink guide core 7 and the small diameter portion 16 of the through hole (at least twice as large). that's all).

In the writing instrument constructed as described above, when an impact such that the ink guide core 7 moves backward is applied, the front edge 13 of the circumferential groove 15 of the ink guide core 7 is
The rearward movement of the ink guide core 7 is restricted by contacting the step portion 17 of the small diameter portion 16 of the through hole 6 when the ink guide core 7 is moved forward. The ink reservoir 5 comes into contact with the rear portion of the small diameter portion 16 and can be reliably locked to the ink reservoir 5.

[0008]

The construction and operation of the present invention are as described above. Even if an impact or the like is applied to the writing implement and a force that moves the ink guide core is applied, the locking can be reliably performed. Since the connection can be maintained stably, the ink supply can be smoothly supplied to the pen tip, and it is possible to always maintain good quality.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a writing instrument of the present invention.

FIG. 2 is an enlarged view of an ink guide core rear part B.

FIG. 3 is a sectional view of an AA part of the guide core of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Ink chamber 3 Storage groove 4 Vertical groove 5 Ink storage body 6 Through hole 7 Ink guide core 8 Middle core 9 Flow path 10 Small diameter portion 11 Pen tip support 12 Pen tip 13 Front edge 14 Rear edge 15 Peripheral groove 16 Small diameter part 17 Step part

Claims (1)

(57) [Claims] 1. An ink tank for directly storing ink, which has a tank for directly storing ink at a rear portion of the barrel and has an ink reservoir mounted at the front of the barrel, and penetrates the ink reservoir from the ink tank through the ink reservoir. In a method of fixing an ink guide core to an ink reservoir, in which ink is led to a pen tip by an ink guide core attached to a hole, a small diameter portion is provided at a rear portion of the through hole of the ink reservoir, and a rear portion of the ink guide core is provided. A peripheral groove and a small diameter portion are formed, and a front edge of the peripheral groove is brought into contact with a step formed by the small diameter portion of the through hole of the ink reservoir to regulate the backward movement of the ink guide core, and abut the edge at the rear of the small-diameter portion of the through hole after being formed by the small diameter portion and the circumferential groove of the ink guide core so as to restrict the forward movement of the ink guide core, also, in
The small diameter portion of the ink guiding core is 0.0% smaller than the small diameter portion of the ink reservoir.
An ink direct storage type writing implement characterized in that the size is increased from 1 to 0.2 mm .