JPH0560884U - Small-tube writing instrument - Google Patents

Abstract

(57) [Summary] [Structure] A small tube-type writing instrument having a pen tip of a small tube 1 and a needle body 3 at the tip of a tip 2, and an apatite, etc. An ink reservoir 7 having a wall surface formed by a wall member 8 made of a hydroxyl group-retaining inorganic substance is provided. [Effect] Entrapment of air in the ink reservoir 7 can be suppressed, and good ink ejection performance by the ink reservoir 7 can be satisfied.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small tube type writing instrument having a pen tip of a small tube and a needle body that slides in the small tube.

[0002]

[Prior Art]

 Conventionally, small-tube writing instruments with various structures are known, and among them, an ink guide member that draws the ink in the ink chamber by capillary force from the back of the tip protruding the small tube at the tip end is included. There is one in which an ink reservoir is provided in the front part of the ink guiding member after being inserted.

The ink reservoir is a place where an elastic body that applies a sliding force to the needle body is arranged, or when the needle body itself has self-elasticity, a rear part of the needle body is arranged. However, it is basically useful for improving the writing stability.

[0004]

[Problems to be solved by the device]

 However, on the other hand, the air is trapped in the ink fountain, and the air cannot be removed. Therefore, the ink fountain becomes an air fountain, which rather hinders ink ejection. is there. This is especially likely to occur when assembling with a writing instrument, and when the ink in the ink chamber is drawn out by the capillary force of the ink guide member and stored in the ink reservoir for the first time, the air originally present in the ink reservoir is fully removed. It cannot be eliminated (the ink does not completely replace the air), and this residual air hinders the ink ejection performance.

[0005]

[Means for Solving the Problems]

 According to the present invention, the small tube at the tip of the tip and the needle body that slides in the small tube are used as the pen tip, and the tip is provided with an ink guide member for guiding the ink in the ink chamber by the capillary force from the rear side. A small-tube writing instrument with an ink reservoir on the front of the ink guide member, characterized in that the inner wall of the tip, which is the wall of the ink reservoir, is made of a hydroxyl group-retaining inorganic substance. The gist is a small-tube writing instrument.

[0006]

【Example】

 An example is shown in the attached FIG. A small tube 1 made of ceramics or metal projects from the tip 2, and a needle body 3 made of synthetic resin or metal projects the rear part 3a from the rear end of the small tube 1 to the large diameter rear part of the inner hole 2a of the chip 2. positioned. The rear portion 3a of the needle body 3 is eccentric so as to easily exhibit elasticity. That is, the one shown is one of the types in which the needle itself has self-elasticity.

An ink guiding member 4 inserted into the tip 2 from the rear receives the rear portion 3 a of the needle body 3 at the front end. The ink guide member 4 is composed of a fiber bundle, a communicating porous foam, a synthetic resin molded body having an ink passage in the longitudinal direction, and has a capillary force for leading out ink, and the rear part of the ink storage member in the barrel 5. It is embedded in the body 6.

The front part of the ink guiding member 4 where the rear part 3 a of the needle body 3 is located is an ink reservoir part 7. Although shown with dots in the figure, the wall surface of the ink reservoir 7 is formed by a member (called a “wall member”) 8 having a hollow inside. The wall member 8 is inserted into the inner hole 2a of the chip 2 and positions the ink guiding member 4 at the rear end.

The wall surface member 8 is made of a hydroxyl group-retaining inorganic substance. For example, Ca ₁₀ (PO ₄ ) ₆ (OH) ₂ (apatite) -based one having a hydroxyl group in its structure, or MgCr ₂ O ₄ -TiO ₂ which changes a hydroxyl group adsorbed on the surface into chemisorption over time. Examples thereof include (magnesium chromate-titanium oxide) type and ZrO ₂ —MgO (zirconia-magnesium oxide) type. These can be easily obtained by using a shaping material, a sintering aid, etc., as required, and sintering the molded product.

In the above, the wall surface member 8 which is a member different from the chip 2 is used, but it may be integrated. For example, by performing a surface treatment such as physical vapor deposition on the inner hole 2a of the chip 2, the hydroxyl group-retaining inorganic substance film as described above is formed only in the ink reservoir 7 or in a wider area. You can also

Further, a concave portion which becomes a part of the ink reservoir 7 may be formed at the front end of the ink guiding member 4. Further, it may be of a type that uses a needle body that is elastically imparted by another member such as urethane, and that accommodates an ink tank regardless of the capillary force and can be replaced if necessary. The ink chamber may be a so-called raw ink type structure.

[0012]

[Effect of the device]

 The small-tube writing instrument of the present invention uses the small tube at the tip of the tip and the needle body that slides in the small tube as the pen tip, and the tip has an ink guide member that draws out the ink in the ink chamber by the capillary force. A small-tube writing instrument that is inserted from the front of the ink guide member with an ink reservoir, and the inner wall of the chip that is the wall of the ink reservoir is made of a hydroxyl group-retaining inorganic substance. As a result, air is unlikely to adhere to the wall surface of the ink fountain in the form of bubbles. Therefore, it is possible to suppress the formation of an air fountain, and it is possible to satisfy good ink ejection properties of the ink fountain.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Small tube 2 Tip 2a Inner hole of tip 3 Needle body 3a Rear part of needle body 4 Ink guiding member 5 Shaft cylinder 6 Ink storage body 7 Ink reservoir 8 Wall member 9 Tail plug 10 Air hole

Claims (1)

[Scope of utility model registration request] 1. A small tube at the tip of a tip and a needle body sliding in the small tube are used as a pen tip, and an ink guide member for drawing out ink in an ink chamber by a capillary force is inserted into the tip from the rear side. A small-tube writing instrument in which an ink reservoir is provided at the front of an ink guide member, characterized in that the inner wall of the tip, which is the wall of the ink reservoir, is formed of a hydroxyl group-retaining inorganic substance. A small-tube writing instrument.