Nib for direct liquid type brush pen and direct liquid type brush pen using the same

Abstract

To provide a pen point for a direct liquid type writing brush pen which has a proper hardness, can obtain a writing feeling equivalent to that of a pen point for a general direct liquid type writing brush pen, and can withstand a repeated knocking operation when used for the direct liquid type writing brush pen of a type in which a valve mechanism is operated by the knocking operation to exude ink to the pen point, and the direct liquid type writing brush pen using the same.SOLUTION: This pen point is used for a direct liquid type brush pen equipped with a valve mechanism and is formed by bundling fibers consisting of nylon resins to form a fiber bundle, bonding and solidifying the fiber bundle with a synthetic binder to make the fiber bundle rod and cutting the fiber bundle into a desired shape. Preferably, the thickness of the fiber is in the range of 0.5 to 5 denier, and the porosity calculated from the following formula is 70 to 80%. Porosity = (1-weight / circular constant * radius 2 * length * specific gravity) SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a nib for a direct ink type brush pen and a direct ink type brush pen using the same, and more specifically to a nib for a direct ink type brush pen that is suitable for use in a type of direct ink type brush pen in which a valve mechanism is operated by knocking the nib, causing ink to seep into the nib, and a direct ink type brush pen using the same. [Background technology]

[0002] There have been various types of direct ink pens in the past, but because direct ink pens have the risk of excessive ink seeping out onto the pen tip, causing the so-called ink dripping phenomenon, valve-type pens are becoming more common, in which ink seeps into the pen tip via a valve mechanism that opens when the pen tip is pressed down.

[0003] In the case of a direct ink pen with a typical valve mechanism, the nib is hard, so knocking the nib opens the valve and allows ink to seep into the nib, but in the case of a direct ink brush pen, the nib is soft and shaped like a brush, so knocking the nib does not open the valve. Therefore, in the case of a direct ink brush pen with a conventional valve mechanism, the valve is opened by knocking the ink cartridge (see, for example, Japanese Patent Application Laid-Open Nos. 2001-150866, 2001-341487, and Japanese Patent No. 6423555) or by pushing in the cap (see, for example, Japanese Patent No. 7008343). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-150866 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-341487 [Patent Document 3] Patent No. 6423555 [Patent Document 4] Patent No. 7008343 Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of conventional direct ink brush pens equipped with a valve mechanism, the pen tip is soft and shaped like a brush, and it is thought that the valve cannot be opened by knocking the pen tip. To open the valve, therefore, methods such as knocking the ink cartridge or pushing in the cap are used, but these methods tend to make the mechanism complicated and expensive.

[0006] Therefore, the present invention aims to provide a nib for a direct ink type brush pen that has an appropriate hardness, provides a writing feel equivalent to that of a general direct ink type brush pen nib, and can withstand repeated knocking operations when used in a direct ink type brush pen that operates a valve mechanism by knocking to allow ink to seep into the nib; and to provide a direct ink type brush pen that has a simple configuration and can be manufactured at low cost, and that can open a valve by knocking the nib, allowing ink to seep into the nib, just like a direct ink type pen with a general valve mechanism. The following are the challenges. [Means for solving the problem]

[0007] The invention described in claim 1 for solving the above problem is a nib for a direct ink brush pen equipped with a valve mechanism, characterized in that the nib for a direct ink brush pen is formed by bundling fibers made of nylon resin into a fiber bundle, bonding and solidifying them with a synthetic resin binder to form a rod-shaped body, and then cutting it into the desired shape.

[0008] In one embodiment, the thickness of the fibers is in the range of 0.5 to 5 denier, and in another embodiment, the porosity calculated by the following formula is 70 to 80%. Porosity = (1 - weight / pi x radius) 2 × length × specific gravity)

[0009] In one embodiment, the synthetic resin binder is a polyurethane resin. In another embodiment, the pen tip has a durometer hardness of 55 to 65.

[0010] The invention described in claim 6 for solving the above problem comprises a pen tip according to any one of claims 1 to 5, a cap, and a main body shaft that stores ink and has a lead holder attached to the tip, A valve case incorporating a valve mechanism is fitted into the lead holder, and the valve mechanism has a valve core that supports the rear end of the nib, and the valve core slides within the valve case in response to a knocking operation on the nib to open and close the ink passage.This is a direct ink brush pen.

[0011] In one embodiment, a resin drip prevention ring is fitted to the pen tip. [Effects of the Invention]

[0012] The nib for a direct ink brush pen according to the present invention has a moderate hardness, providing a writing feel equivalent to that of a typical direct ink brush pen nib, and has the effect of being able to withstand repeated knocking operations when used in a direct ink brush pen that operates a valve mechanism by knocking to allow ink to seep into the nib. Furthermore, a direct ink brush pen equipped with the valve mechanism according to the present invention can be manufactured at low cost with a simple configuration, and has the effect of being able to open the valve by knocking the nib, allowing ink to seep into the nib, just like a direct ink pen equipped with a typical valve mechanism. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a vertical cross-sectional view of one embodiment of a direct ink type brush pen according to the present invention with the cap removed. [Figure 2] 1 is a photograph showing the results of a nib durability test of the nib for a direct ink type brush pen according to the present invention. [Figure 3] 1 is a photograph showing the results of a stability test over time of a nib for a direct ink type brush pen according to the present invention. [Figure 4]1 is a photograph showing the results of a writing test of a nib for a direct ink type brush pen according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following description of an embodiment of the present invention will be given with reference to the accompanying drawings. Generally, pen nibs are manufactured by bundling thermoplastic resin fibers into a fiber bundle, bonding and solidifying the bundle with a synthetic resin binder, forming a rod-shaped body, and then cutting the body into the desired shape. The thermoplastic resin used in this case can be polyester resin, acrylic resin, polypropylene resin, or the like, but polyester resin is often used. The synthetic resin binder can be phenolic resin, polyurethane resin, melamine resin, epoxy resin, elastomer resin, or the like.

[0015] In contrast, the nib for a direct ink brush pen according to the present invention is a nib used in a direct ink brush pen equipped with a valve mechanism, and is made by bundling nylon resin as the thermoplastic resin, bundling the resin fibers into a fiber bundle, bonding and solidifying it with a synthetic resin binder to form a rod-shaped body, and cutting it into the desired shape. The nylon core uses polyurethane resin as the synthetic resin binder. Nylon fibers are characterized by a low Young's modulus and flexibility. Urethane resin has good adhesion to nylon fibers, further increasing their elasticity, resilience, and abrasion resistance, allowing the nib to fully exhibit its functions as a direct ink brush pen nib (stopping, strokes, flicks, etc.).

[0016] The denier (thickness) of the nylon resin fiber that constitutes the pen tip of the present invention is in the range of 0.5 to 5 denier, preferably 1 denier. A range of 0.5 to 10 denier provides a smooth writing feel and proper ink flow. If the thickness exceeds 5 denier, the capillary force is too weak, causing ink dripping and a rough writing feel. If the thickness is less than 0.5 denier, the capillary force is too strong, resulting in poor ink ejection and difficulty in ejecting large ink particles, as well as high costs.

[0017] The nib hardness (JIS K6253 Type A durometer hardness) of the nylon core according to the present invention is within the range of 55 to 65. The nib hardness is determined by the type of fiber, the number of fibers, the fiber thickness, the adhesive resin, the resin concentration, etc. Incidentally, the nib hardness of a polyester core is 70 to 75.

[0018] The porosity of the nylon core according to the present invention, calculated by the following formula, is preferably in the range of 70 to 80%, more preferably 75 to 79%. If the porosity is 70% or less, the ink flow is poor and the writing feel is hard, while if it is 80% or more, the ink flow is too good, causing dripping and poor stability over time, and the color tends to fade when the pen is facing up, while the pigment clogs and causes smearing when the pen is facing down. Porosity = (1 - weight / pi x radius) 2 × length × specific gravity) (PO(%)=(1-Wt / πr 2 ×l×ρ)) The porosity calculated by this formula is mainly affected by the resin concentration, the number of fibers, and the fiber thickness.

[0019] In manufacturing the nylon core according to the present invention, nylon resin, a fibrous thermoplastic resin, is compressed and densified into a fiber bundle by passing it through a molding die heated to 210 to 240° C. The fiber bundle is then impregnated with polyurethane resin, which acts as a synthetic resin binder and has good adhesion to nylon fibers, and dried and solidified to form a rod-shaped body, which is then cut into the desired shape to form a nib for a direct ink brush pen.

[0020] Figure 1 is a vertical cross-sectional view of one embodiment of a direct ink brush pen using a direct ink brush pen nib according to the present invention, with the cap 11 removed. As shown, this direct ink brush pen comprises a main body 1 that directly stores ink 2, a lead holder 4 that is attached to the opening of the main body 1 by screwing or the like, a nib 5 that is a nylon lead supported by the lead holder 4, and a valve mechanism 7 housed in a valve case 6 that fits into the lead holder 4. A stirring ball 3 that stirs the ink 2 together with the ink f2 is housed within the main body 1. A drip prevention ring 8 made of urethane resin or the like is fitted onto the nib 5, and the drip prevention ring 8 is tightly fitted into the lead holder 4 to prevent ink from dripping, which could leak into the lead holder 4.

[0021] The valve mechanism 7 may have a configuration commonly used in knock-type writing instruments. For example, the valve mechanism 7 is housed in a valve case 6 that fits into the lead holder 4, and the rear end of the nib 5 is inserted into the valve wick. When the nib 5 is knocked, the valve wick is pushed in and slides within the valve case 6, and its tapered valve seat flange moves away from the valve seat, opening the ink passage. With the ink passage open, ink 2 inside the main body 1 is supplied to the nib 5. When the knocking operation on the nib 5 is completed, the pushed-in valve wick returns to a position where it closes the ink passage due to the action of a return spring.

[0022] The direct ink brush pen according to the present invention has the above-described configuration, and like a general brush pen, it is used for writing by removing the cap 11. The ink 2 is dispensed to the pen tip 5 by knocking the pen tip 5 directly.

[0023] The pen nib 5 manufactured as described above has sufficient durability against repeated knocking, and to demonstrate this, comparative tests were conducted on the pen nib durability test, stability over time test, and writing completion test between the pen nib 5 (Example) which is a nylon core according to the present invention, a pen nib (Comparative Example 1) which is different from the Example in that it has a nylon core but a denier of 6 denier, and a general polyester core (Comparative Example 2). The results are as follows. TIFF2026012514000002.tif36170

[0024] Comparative Example 1 differs from the Examples in that its denier is 6 denier, but the thicker denier weakens the capillary force, making the ink in the nib more likely to separate after long-term storage. This can be seen from the clear smudges that appear when writing with nylon core 2 facing upward after one month, as shown in Figure 3.

[0025] The pen tip durability test involved observing the initial shape of the Example and Comparative Examples 1 and 2 before knocking, their state after 100 knocks, and the written lines after 100 knocks. As shown in Figure 2, the Example showed no change in shape even after 100 knocks, whereas Comparative Example 2 showed significant deformation and was no longer suitable for writing. Furthermore, comparing the written lines, the Example showed that the thickness of the written lines could be controlled even after 100 knocks (fine writing was possible with vertical writing, medium writing with a 65-degree angle, and writing with a uniform thickness was possible), whereas Comparative Example 2 showed difficulty in writing fine characters, difficulty in varying the thickness of characters, and inability to write with a uniform line. Although not shown in Figure 2, the pen tip durability of Comparative Example 1 was not significantly different from that of the Example.

[0026] In the stability test over time, the pens held facing up and facing down were stored at 50°C for one month, and the writing performance after one month was compared with the writing performance before the test. Figure 3 is a photograph showing the comparison results, and no abnormalities were observed in the writing performance of the Example. In contrast, in Comparative Example 1, no abnormalities were observed when the pen was held facing down, but as mentioned above, clear smearing was observed when the pen was held facing up. In Comparative Example 2, clear smearing was observed both when the pen was held facing up and when facing down. This difference in Comparative Example 2 is thought to be due to the fact that, as in Comparative Example 1, the capillary force was weak due to the large denier, which resulted in ink separation within the pen tip.

[0027] The writing test was conducted to check whether the ink could be used up without clogging and without any change in writing width or writing performance from the start to the end of writing (97% ink consumption rate after writing about 250 m). As shown in Figure 4, it was confirmed that the ink could be used up until the end of writing without any change in writing width or writing performance.

[0028] As described above, in the case of the nib for a direct-ink brush pen (Example) according to the present invention, good results were obtained in the nib durability test, stability over time test, and writing-through test. This is thought to be due to the compatibility between the nylon resin and polyurethane resin, and the synergistic effect of the denier number of the nylon resin (0.5 to 5 denier), nib hardness (55 to 65), and porosity (70 to 80%). [Industrial Applicability]

[0029] The nib for a direct ink brush pen according to the present invention has a moderate hardness, providing a writing feel equivalent to that of a general brush pen nib, and when used in a direct ink brush pen of the type that operates a valve mechanism by knocking to allow ink to seep into the nib, it has the effect of being able to withstand repeated knocking operations.Furthermore, a direct ink brush pen equipped with the valve mechanism according to the present invention can be manufactured at low cost with a simple configuration, and has the effect of opening the valve by knocking the nib and allowing ink to seep into the nib, just like a direct ink pen equipped with a general valve mechanism, so it has great industrial applicability. [Explanation of symbols]

[0030] 1 Main body shaft 2. Ink 3 stirring balls 4-core holder 5. Pen Tip 6 Valve case 7 Valve mechanism 8 Drip prevention ring 11 Cap

Claims

1. The pen tip is used in a direct-ink type brush pen that has a valve mechanism and opens the valve mechanism by pressing the pen tip, The aforementioned pen tip is formed by bundling fibers made of nylon resin to form a fiber bundle, bonding and solidifying it with a synthetic resin binder to form a rod-shaped body, and then cutting it into the desired shape. The thickness of the aforementioned fibers is in the range of 0.5 to 5 denier. The aforementioned synthetic resin binder is polyurethane resin. A pen tip for a direct-ink type brush pen, characterized by the following features.

2. The pen tip for a direct-ink type brush pen according to Claim 1, wherein the durometer hardness of the pen tip is 55 to 65.

3. The pen tip for a direct-ink type brush pen according to claim 1, wherein the porosity calculated from the following formula is 70 to 80%. Porosity = (1 - weight / pi × radius) ２ (×Length × Specific Gravity)

4. A direct-ink type brush pen comprising a pen tip and a valve mechanism according to any one of claims 1 to 3, wherein the valve mechanism is opened by pressing the pen tip, It consists of a cap and a main body that stores ink and has a lead holder attached to its tip. A direct-ink type brush pen is characterized in that a valve case containing the valve mechanism is fitted inside the lead holder, the valve mechanism includes a valve core that supports the rear end of the pen tip, and the valve core slides within the valve case to open and close the ink passage when the pen tip is pushed in.

5. The direct-ink type brush pen according to claim 4, wherein a resin drip-prevention ring is fitted to the pen tip.

Images