JPH056151Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is a direct-injection type writing instrument without batting, that is, the ink is filled with fluid water-based ink directly into the ink cylinder without the ink being absorbed by the ink absorbing material, and the ink is then flowed back. To provide an ink cylinder which is used for a writing instrument such as a ballpoint pen, a felt-tip pen, or a capillary type writing instrument filled with an inhibitor, allows smooth writing without hindering the ejection of ink, and can be filled with a large amount of ink.

This ink cylinder may be further mounted inside another barrel, or may be used as a writing instrument held by the fingertip.

<Prior art> As shown in Figure 6A, the ink cylinder of a conventional direct liquid writing instrument without batting has a simple shape with a pen tip attached to the tip of the cylinder, and an ink outlet hole penetrated by the pen tip. Alternatively, the ink in the ink cylinder is designed so that it passes directly into the ink outlet hole without being controlled at all by an ink outlet (not shown) that is tightly inserted into the hole, and is led out to the writing tip of the pen nib. It is filled with a low-viscosity water-based ink whose main solvent is water or a water-based ink imparted with thixotropy by a gelling agent, and is further made of a highly viscous or semi-fluid material such as a grease-like substance or polybutene. Filled with anti-backflow agent.

<Problem that the invention aims to solve> Therefore, with conventional direct-fluid writing instruments that do not have padding, if the writing instrument is stored in an angled or upright position with the nib facing upward for a long period of time, Since the backflow preventive agent has a lower density than water-based ink, it floats along the inner periphery of the ink cylinder toward the pen tip, moves uncontrolled, and passes directly to the inner end of the pen tip. The backflow preventive agent then enters the ink outlet hole of the pen tip, but because of its high viscosity, it stops before reaching the writing tip of the pen tip, and adheres to the inner circumferential surface of the ink outlet hole, partially or completely filling the hole. This closes the ink and prevents the ink from coming out, resulting in blurred writing or the inability to write.

When the ink outlet body is tightly inserted into the ink outlet hole, the backflow preventive agent comes into contact with the ink outlet body and penetrates a little, but stops midway and prevents the ink from being discharged.

This phenomenon is particularly noticeable in the case of large-diameter ink cylinders because the inner periphery of the ink cylinder has a weak ability to retain the backflow preventive agent, and it has been difficult to obtain an ink cylinder filled with a large amount of ink.

<Means for solving the problem> In this idea, a trap, which is an annular space, is formed in the tip of the ink cylinder, and the moving anti-backflow agent is guided there, and is passed directly to the ink outlet hole of the pen tip. The occurrence of blurred writing or inability to write is prevented by preventing the ink from entering or coming into direct contact with the ink emitting body.

<Example> Next, an example of this invention will be described in detail with reference to the drawings.

Figure 1 shows an example of a direct liquid ballpoint pen without batting. 1 is the tip of the ballpoint pen. A ball hole A is bored at the tip. A ball B is inserted into the hole A and fixed by caulking. A small-diameter slit S is perforated in a vertical direction from the center of the bottom of A, and an ink outlet hole 2 of a larger diameter is communicated with the slit S, and a fitting cylindrical portion 3 is formed around the hole.

Reference numeral 4 denotes an ink cylinder, and a tapered part 6 and a thin cylindrical pen tip holding part 7 are connected to the tip of the cylinder part 5, and the inner end of the holding part 7 is extended and inserted into the tip of the cylinder part 5. It has an inner cylindrical portion 8 that protrudes toward the distal end. An annular space 9 is formed between the tapered part 6 and the inner cylindrical part 8, and serves as a trap that prevents the ink I or backflow preventive agent H in the space 9 from flowing directly to the ink outlet hole 2. Instead of a continuous annular groove in the space 9, it may be a plurality of holes scattered annularly.

I is a water-based ink using water as the main solvent, and H is a backflow prevention agent made of a grease-like substance or a highly viscous or semi-fluid substance such as polybutene.

Although this ink cylinder 4 is not shown, it is installed in another barrel to form a direct liquid type ballpoint pen having no batting.

FIG. 2 also shows an embodiment of a direct liquid ballpoint pen without batting, and is different from FIG. , so that the ink I or the backflow preventive agent H in the space 9 is not allowed to flow directly into the ink drainage hole.

FIG. 3 also shows an embodiment of a direct liquid type ballpoint pen having no padding, and only the points different from the embodiment of FIG. 1 will be explained.

A porous ink guide body C, such as a resin-treated fiber bundle, is tightly inserted into the ink guide hole 2 .

FIG. 4 shows an embodiment of the felt-tip pen, and only the points different from the embodiment of FIG. 1 will be described.

A large-diameter ink outlet hole ₂₄ is bored through the pen tip ₁₄ , and an ink outlet body _C4 , such as a resin-treated fiber bundle, is inserted and fixed in the hole ₂₄ . A cylinder D made of foamed resin is inserted and fixed into the inner end of the nib holding part 7 of the ink cylinder 4, which allows ink to penetrate and pass through, but does not allow backflow preventive agent to pass through.
An annular space 9 is provided between the tapered portion 6 and the cylindrical body D, and serves as a trap.

FIG. 5 shows an embodiment of a capillary type writing instrument, and only the points different from the embodiment of FIG. 1 will be described.

The pen nib ₁₅ has a small diameter slit S5 and a large diameter ink outlet hole ₂₅ , the slit _S5 has _a thin tube P made of a material such as ceramic or stainless steel, and the hole ₂₅ has a resin-processed hole. The ink guide body C, which is like a fiber bundle, is tightly inserted and fixed. <Effects of the Invention> Next, the effects of this invention will be explained with reference to FIG. 6B.

FIG. 6B again shows the example of the direct liquid ballpoint pen without the batting shown in FIG. Since the ink is captured here and does not enter the ink outlet hole 2, the ink outlet is not hindered and the writing is not blurred or impossible to write, and smooth writing is possible.

Further, according to this invention, it is possible to easily obtain a large diameter ink cylinder filled with a large amount of ink.

When the ink outlet body C is tightly inserted into the ink outlet hole 2, smooth writing is possible because the backflow preventive agent does not come into contact with the ink outlet body as described above.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing one embodiment of the ink cylinder of a direct liquid ballpoint pen without batting of this invention, and Figs. 2 and 3 are longitudinal sectional views showing other embodiments of the ink cylinder of the ballpoint pen. , FIG. 4 is a vertical cross-sectional view showing an example of a felt-tip pen, FIG. 5 is a vertical cross-sectional view showing an example of a capillary writing instrument, and FIG. 6A is a problem with a conventional direct liquid ballpoint pen without batting. FIG. 6B is a longitudinal sectional view illustrating the effect of the ballpoint pen of FIG. 1. 1... Pen tip, 2... Ink outlet hole, 3... Fitting cylinder part, 4... Ink cylinder, 8... Inner cylinder part, 9...
Annular space, C... Ink derived body.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In the ink cylinder of a direct liquid writing instrument without batting, which is filled with ink and backflow preventive agent without using batting, and has a pen tip attached to the tip, An ink cylinder of a direct liquid type writing instrument having no batting, characterized in that an annular space is provided in the tip portion thereof, which does not directly communicate with an ink outlet hole of a pen tip. (2) Utility model registration claim 1, in which an annular space is formed between the inner periphery of the tip and a pen tip tube that fits into the inner periphery of the tip and projects inward from the inner periphery of the tip. An ink cylinder for a direct liquid writing instrument that does not have the filling described. (3) An ink cylinder for a direct liquid writing instrument without batting according to claim 1 of the utility model registration claim, in which an annular space is formed between the inner periphery of the tip cylinder part and the nib cylinder part. (4) An ink cylinder for a direct liquid type writing instrument without batting according to claim 1 of the utility model registration claim, in which an ink outlet body made of a porous material that allows ink to penetrate into an ink outlet hole is tightly inserted.