JP2605170Y2 - Writing implement - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing implement having a temporary ink reservoir between a pen tip and an ink tank for storing ink in a raw ink state.

[0002]

2. Description of the Related Art A writing implement of the kind described above is called a raw ink type writing implement, and is used in many writing implements such as a fountain pen, a small tubular writing implement, and a makeup implement, and various shapes and structures are known. As a temporary ink reservoir member, a through hole, a temporary ink reservoir groove having a comb-like longitudinal section, a slit communicating with the temporary ink reservoir groove, and an ink-air exchange path communicating the slit with the through hole. Is also a kind of one that has a through hole, and the inside of the through hole is used as an ink passage from the ink tank to the pen tip.
It has advantages such as excellent ink drying properties. Here, in this case, the ink-air exchange path is usually provided at the rear end of the slit. In order to allow air to enter the ink tank as quickly as possible, it is more convenient to be located at the rear as much as possible. On the other hand, the provision of the ink-air exchange path at the rear in this manner can suppress ink leakage from the pen tip due to the potential energy of the ink corresponding to the distance between the ink-air exchange path and the pen tip. It is necessary, but for this, ink-
Attempts have been made to reduce the opening area of the ink-air exchange passage so as to increase the force required to break the ink film because air enters the ink tank at the air exchange passage.

[0003]

However, in order to suppress ink leakage from the pen tip, it is still disadvantageous to provide the ink-air exchange path at the rear. For example, Arco
Relatively low-viscosity oil-based ink using
Since the surface tension is smaller than that of the water-based ink generally used for the raw ink type writing implement, the force required to break the above-mentioned ink film is also small, and ink leakage from the pen tip easily occurs. Further, if the size of the temporary ink storage member is increased in order to increase the amount of ink to be accommodated, the potential energy of the ink also increases, and ink leakage from the pen tip easily occurs.

[0004] According to such a concept, it can be said that it is preferable that the ink-air exchange path is located rather forward. However, in order to be realistic, a related question is how to create a sufficient ink reservoir near the ink-air exchange path and prevent this ink from leaking out of the air holes. Has to be resolved. That is, if ink is temporarily stored in the ink reservoir groove, it is necessary to retreat this ink in preference to air, and for that purpose, at least a certain amount of ink should be provided near the ink-air exchange path. It ’s important that you ’re actively collecting,
In this regard, in the case where the ink-air exchange path is provided at the rear as in the related art, the clearance between the inner wall of the shaft cylinder, which is the exterior body, and the meat portion forming the temporary ink reservoir groove near the ink-air exchange path is increased. By making it zero or smaller, ink can be accumulated even on the inner wall of the barrel, that is, the inner wall of the barrel is made into an ink surface, and thereby the amount of ink in the vicinity of the ink-air exchange path can be secured. However, when the ink-air exchange path is located in front, simply by making the front inner wall of the shaft cylinder an ink surface, the air holes that communicate between the inside and outside of the writing instrument are also close to the air holes. The risk of ink leakage from the ink becomes extremely high.

[0005]

According to the present invention, there is provided a writing instrument comprising a temporary ink reservoir member interposed between a pen tip and an ink tank for storing ink in a raw ink state, wherein the temporary ink reservoir is provided. The member has a through hole, a comb-shaped temporary ink reservoir groove having a vertical cross section, a slit communicating with the temporary ink reservoir groove, and an ink-air exchange passage communicating the slit with the through hole. In a writing instrument using the same, the ink-air exchange passage is provided at the front end of the slit, and the ink-air exchange passage portion of the temporary ink reservoir member is provided rearward on the inner wall of an exterior body in which the ink-air exchange passage is disposed. A writing tool is provided in which a protruding cylinder portion is provided, and the ink-air exchange path portion is inserted into the cylinder portion, wherein the inner wall of the cylinder portion has an ink surface. .

[0006]

The cylinder which secures the amount of ink in the vicinity of the ink-air exchange path by making the inner wall an ink surface serves as a shield against air holes for preventing the accumulated ink from leaking from the air holes.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example will be described with reference to FIG. Shaft barrel 1
Has a rear inner hole as it is as an ink tank 2, and accommodates a temporary ink reservoir 4 in a front inner hole separated from the ink tank 2 by a liquid-tight elastic ring 3. Reference numerals 5, 6, and 7 indicate a through-hole, a temporary ink reservoir groove, and a slit of the temporary ink reservoir member 4, respectively.
Here, the illustrated temporary ink reservoir groove 6 is narrower toward the rear. In addition, an ink guide core 8 having an inside as an ink passage is inserted into the through-hole 5 while consciously drawing an extruded product of a synthetic resin. The rear end of the ink guide core 8 protrudes into the ink tank 2, while the front end together with the front end of the temporary ink reservoir 4 is formed by the front body 9 attached to the tip of the barrel 1. It is inserted into a cylindrical part 10 provided on the inner wall and protruding rearward. A front portion of the slit 7 extends to a portion inserted into the cylindrical portion 10, and an ink-air exchange channel 11 is provided at a front end thereof. The inner diameter of the cylindrical portion 10 in the vicinity of the ink-air exchange path 11 has no clearance with the outer wall of the temporary ink reservoir 4 or has a small clearance. In this part, the slit 7 has a hole shape that does not open to the side, or
In any case, since a thin cylindrical space is formed, a strong capillary force acts on the space, and therefore, the space is formed by ink-air In the vicinity of the exchange path 11, it is a portion where ink is actively stored. The reason why the diameter of the inner hole on the opening end side of the cylindrical portion 10 is large is that the amount of ink to be secured near the ink-air exchange path 11 does not need to be unnecessarily large. It is better for the cylinder to be a part where ink is less likely to collect.
This is because it is preferable to prevent the ink from moving outward. In addition, the temporary ink reservoir 4 can be easily inserted. Reference numeral 12 denotes an air hole formed as a gap between the barrel 1 and the tip body 9, reference numeral 13 denotes an ink relay core, reference numeral 14 denotes a pen tip holder attached to the tip body 9, and reference numeral 15 denotes a pen tip holder. The pen tip protrudes from -14.

Next, another example will be described with reference to FIG. Basically the same parts as those in the previous example are denoted by the same reference numerals, but in this example, a separate ink tank body 16 can be attached to and detached from the rear part of the barrel 1.
It is fixedly attached as a tool or by ultrasonic welding or the like. In addition, the tip body 9 in the previous example is omitted as a member and is integrated with the shaft cylinder 1. That is, in this example, the exterior body having the cylindrical portion 10 is the shaft cylinder 1. The air holes 12 are also formed as holes in the barrel 1. In addition, the ink relay core 13 and the pen tip holder 14 in the previous example are also omitted as parts, and the pen tip 15 is drawn with the awareness that the illustrated one is made of a fiber converging body. It is integrated with the body 8. These facts show that components can be appropriately integrated and separated into a suitable type of writing implement such as a ball-point pen, a small-tube type writing implement, a writing brush, and an eyeliner. Although illustration is omitted, as in a normal fountain pen, the barrel 1 is used as a front shaft, what is called an ink tank body 16 is used as a rear shaft, and both are detachably screwed together. For example, it is also possible to house the inside of the device.

Although the description is omitted, in the previous example, the tip of the through-hole 5 of the temporary ink reservoir 4 is a small-diameter hole for fixing the ink guide core 8, and this small-diameter hole is used as the ink. In contrast to the case where the air-exchange passage 11 is extended to the rear end on the through hole 5 side, in the present embodiment, the shaft cylinder 1 is provided with an engagement portion for the pen tip 15, and the portion of the ink-air exchange passage 11 is formed. The through hole 5 is a large diameter hole. Temporary ink reservoir 4
The through hole 5 can be appropriately formed as long as it allows air entering from the ink-air exchange path 11 to enter the ink tank 2.

Further, the temporary ink reservoir member 4 in the present embodiment also has a temporary ink reservoir groove 6 formed in a portion to be inserted into a portion of the inner wall of the cylindrical portion 10 which serves as an ink surface. The ink reservoir groove 6 in this portion is provided with an ink-air exchange path 11.
This is useful for the area where ink is actively stored in the vicinity of.

[0011] In addition to the above, various other methods can be used. For example, the cross section of the temporary ink reservoir groove portion of the temporary ink reservoir member is generally circular in shape, but, for example, in an elliptical shape,
It is also possible to form two slits in a 180 ° arrangement.

[0012]

The writing implement according to the present invention is a writing implement comprising a temporary ink reservoir member interposed between a pen tip and an ink tank for storing ink in a raw ink state. , A through hole, a comb-shaped temporary ink reservoir groove having a vertical cross section, a slit communicating with the temporary ink reservoir groove, and an ink-air exchange path communicating the slit with the through hole. In the writing instrument used, the ink-air exchange path is provided at the front end of the slit, and the temporary ink reservoir member projects rearward from the inner wall of an exterior body in which the ink-air exchange path portion is disposed. A cylinder portion is provided, and the ink-air exchange path portion is inserted into the cylinder portion. Here, since the inner wall of the cylinder portion is an ink surface, the ink-air exchange path and the pen tip are connected to each other. According to distance It is possible to suppress ink leakage from the pen tip due to the potential energy of the ink, and it is very important for the function of the temporary ink reservoir member to retreat the ink in the temporary ink reservoir groove in preference to air. This can be satisfied by forming a sufficient ink reservoir by the cylinder in the vicinity of the ink-air exchange path, and furthermore, the leakage of the ink from the air holes can be sufficiently suppressed, and therefore, it is practically impossible in the past. However, the use of the oil-based ink and the increase in the capacity of the contained ink can be tolerated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view for explaining an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view for explaining another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Ink tank 3 Elastic ring 4 Temporary ink storage member 5 Through hole 6 Temporary ink storage groove 7 Slit 8 Ink guide core 9 Front body 10 Tube 11 Ink-air exchange path 12 Air hole 13 Ink relay core 14 Pen tip holder 15 Pen tip 16 Ink tank body

Claims (1)

(57) [Scope of request for utility model registration] 1. A writing implement having a temporary ink reservoir member interposed between a pen tip and an ink tank for storing ink in a raw ink state, wherein the temporary ink reservoir member has a through hole, a longitudinal section, A writing implement using a face comb-shaped temporary ink reservoir groove, a slit communicating with the temporary ink reservoir groove, and an ink-air exchange path communicating the slit with the through hole. The ink-air exchange path is provided at the front end of the slit, and a tubular portion that projects rearward from an inner wall of an exterior body in which the ink-air exchange path portion of the temporary ink reservoir member is provided is provided. A writing instrument, wherein the portion of the ink-air exchange path is inserted into a cylindrical portion, wherein an inner wall of the cylindrical portion is an ink surface.