JP4582275B2 - Nib having air hole and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nib having an air hole formed in the nib itself and a manufacturing method thereof in order to prevent problems such as ink leakage from the nib of a marking pen or a cosmetic pen.
[0002]
[Prior art]
When the internal pressure inside the pen body of a marking pen or cosmetic pen exceeds the external air pressure (for example, when the pen body is used at a high altitude or when the pen is held in the hand, the air inside the pen body is thermally expanded due to body temperature. Etc.), a phenomenon of so-called ink leakage, in which air inside the pen body entrains and ejects ink from the pen tip portion, may occur. In order to prevent this ink leakage phenomenon, the pen is provided with an air hole for replacing the expanded and contracted air, and the ink leakage is prevented by reducing or equalizing the difference between the internal pressure and the external pressure inside the pen body.
[0003]
As a means for securing the air hole, there is a method of providing a hole in the pen body so that an opening is arranged inside the cap, or a rib toward the center is provided on the inner surface of the pen tip insertion opening to hold the pen tip, A method of using the gap as an air hole by making the diameter of the insertion port larger than the diameter of the pen tip is known.
[0004]
In addition, when using a pen body that is not provided with air holes, a method of using a polygonal pen tip with respect to the round pen tip insertion opening as an air hole, When a round pen tip is used for the pen tip insertion port, a groove extending in the axial direction is provided on the side surface of the pen tip as in Design Registration No. 483290, and this groove is used as an air hole. Methods are generally known.
[0005]
[Problems to be solved by the invention]
When a groove extending in the axial direction is provided on the side surface of the porous nib that is deformed by stress, and this groove is used as an air hole, the groove is used when the pen nib is pressed into the pen nib insertion port in the pen assembly process. However, there was a problem that it was easy to collapse and it was difficult to play the role of air holes.
[0006]
The present invention provides a nib having an air hole that is difficult to be crushed even if the air hole is provided in the porous nib itself that is deformed by stress even if the nib is press-fitted into the nib insertion port. Another object of the present invention is to provide a processing means that can easily process the air holes and has high work efficiency.
[0007]
[Means for Solving the Invention]
In order to achieve the above object, in the nib made of the porous body of the present invention, the hole functioning as an air hole is formed so as to penetrate the inside of the nib, and the inner surface of the hole is entirely or partially formed. It is characterized by being melted and solidified.
[0008]
When configured as described above, air holes are provided in a porous nib that is easily deformed, and even if the nib is deformed by applying stress from the outside, the air holes are not formed because there is a hard solidified layer on the inner surface of the air hole. It is hard to crush. Even when the pen tip is press-fitted into the pen tip insertion port in the pen assembling process, the air hole is not easily crushed and effectively plays the role of the air hole. The present invention exhibits a particularly effective effect when the porous nib is easily deformed, for example, when the nib has low rigidity or when the nib has elasticity. Further, the pen tip configured as described above has an advantage that the position of the air hole opening can be set at a free position according to the design of the pen tip, such as the vicinity of the writing tip, in addition to the side surface portion of the pen tip. .
[0009]
As a method for processing the air hole penetrating the inside of the nib, a method of forming the air hole by energy beam processing is preferable.
[0010]
By processing the air hole that penetrates the inside of the nib by energy beam processing, the formation of the melt-solidified layer can be easily adjusted simply by changing the processing conditions such as the type and output of the energy beam and the irradiation time. . Moreover, since the machining can be carried out in a short time of 300 ms (milliseconds) or less, the work efficiency is good.
[0011]
【Example】
FIG. 1 shows an embodiment of a nib according to the present invention, which is an example applied to a nib having a tip shape processed into a nata shape for a line marker.
[0012]
The nib 1 is a porous nib having an outer diameter of 5.0 mm, a total length of 30 mm, and a porosity of 62%, which is formed by bundling polyester fibers and bonded with urethane resin. The portion inserted into the pen body 4 is processed to have a smaller diameter than the outermost diameter. Using a water-cooled carbon dioxide laser oscillator with a pulse generator with an output of 100 W from point A on one side processed into a nata shape, which is the writing tip of the nib 1, toward point B inserted into the pen body 4, 30 W output Then, one pulse of 100 ms was irradiated to obtain a linear air hole 2 having a hole diameter of φ0.5 mm that obliquely penetrated at an angle of about 30 ° with respect to the axial direction. As shown in FIG. 4 showing the longitudinal section of the nib, the polyester fiber of the nib material was melted and solidified by the heat of the carbon dioxide laser, and a strong melt-solidified layer 3 was formed on most of the inner surfaces of the air holes 2. When the pen tip 1 is press-fitted into the pen body 4 as shown in FIG. 3, the air hole 2 is installed so that the point A facing the outside air and the point B inside the pen body 4 communicate with each other. The pressure difference was relaxed, and it became a role of an air hole. Further, since a strong melt-solidified layer 3 is formed on the inner surface of the air hole 2, the air hole 2 is not easily crushed even when the pen tip 1 is press-fitted into the pen body 4, and an effective air hole is maintained. It became.
[0013]
As the material of the nib 1 in the present invention, thermoplastic synthetic resins such as polyester, nylon, and polypropylene that are easily melted and solidified are particularly effective. However, organic materials and inorganic materials can be used as long as the same function and effect can be obtained. Regardless of, it is not particularly limited.
[0014]
In order for the air hole 2 penetrating the pen tip 1 to function effectively, the opening of the air hole is formed so as to communicate with the outside (point A) and the inside of the pen body 4 (point B). The pressure difference must be relaxed, but with regard to its shape, installation position, and quantity, one air hole is formed obliquely with respect to the axial direction in the shape of a round hole as shown in FIG. However, the present invention is not limited to this, and the shape, installation position, and quantity of the air holes may be appropriately changed so as to suit the design of the pen tip and the pen body. For example, if you want to form a plurality of irregularly shaped air holes such as polygons or stars, use a mask with a hole in the desired shape and process it by partially blocking the energy beam. Can be obtained.
[0015]
The size of the air hole may be a hole diameter smaller than the pen tip outermost diameter, but a range from 0.1 mm to a half of the pen tip outermost diameter is particularly preferable. When the hole diameter is reduced to less than 0.1 mm, the holes are easily blocked with ink, so that it is difficult to function as air holes. If the hole diameter is larger than half the pen tip outer diameter, the function of reducing the difference between the internal pressure and the external pressure of the pen body is sufficient. However, if the air hole is too large, the strength of the pen tip decreases, Problems such as bending and bending during assembly and writing are likely to occur.
[0016]
The melt-solidified layer 3 may be the entire inner surface or a part of the inner surface of the air hole 2, but when the entire surface is melted and solidified, the melt-solidified layer 3 is strong and the air hole 2 is less likely to collapse. When the ink enters the air hole 2 due to an impact on the air hole 2 and the air hole 2 is temporarily blocked by the ink reservoir, the ink reservoir tends to be difficult to be discharged. On the other hand, when the melted and solidified layer 3 is partially melted and solidified, the strength of the melted and solidified layer 3 is slightly lowered, but the entire inner surface of the air hole 2 is melted even when the air hole 2 is temporarily blocked by the ink reservoir. Since the ink is not solidified, the ink easily moves from the gap into the pen tip 1 by capillary action, and the ink reservoir in the air hole 2 is easily discharged quickly. The melt-solidified layer 3 on the inner surface of the air hole 2 can be adjusted by changing various processing conditions such as the type and output of the energy beam, and the irradiation time. Therefore, the melt-solidified layer 3 may be formed according to the application.
[0017]
The energy beam for punching air holes in the nib 1 is not limited to a carbon dioxide laser, but can be used from an energy beam that can be processed in the same manner, such as an excimer laser, a YAG laser, an electron beam, and an ion beam. You may choose according to. For example, if you want to form a large number of melted and solidified layers, the melted and solidified layers can be easily formed by irradiating with high power and long time using an infrared laser such as carbon dioxide laser or YAG laser, which tends to generate heat when punching air holes. Can be formed. In addition, when it is desired to keep the melt-solidified layer to the minimum that air holes can hold, if a short pulse of several tens ns (nanoseconds) is irradiated using an excimer laser that is a high-power ultraviolet laser, the thermal effect will be reduced. Since the amount is extremely small, formation of the melt-solidified layer can be minimized.
[0018]
The punching process of the air hole in the present invention may be performed after the shape of the nib is processed, or the shape of the nib may be processed after the drilling process.
[0019]
FIG. 5 shows another embodiment of the nib of the present invention, which is an example applied to a rectangular nib having a tip shape processed into a nata shape for an oil-based pen.
[0020]
The nib 1 is a porous rectangular nib having a long side of 6.0 mm, a short side of 4.2 mm, a total length of 35 mm, and a porosity of 62%, in which polyester fibers are bundled and bonded with a urethane resin. It is processed into a nata shape with a symmetric rear end. Using a water-cooled carbon dioxide laser oscillator with a pulse generator with an output of 100 W, from the side surface A of the nib 1 toward the point B inserted into the pen body 4, 1 ms of 1 ms is irradiated at 30 W output, and the axial direction As a result, a straight air hole 2 having a hole diameter of φ0.4 mm that obliquely penetrated at an angle of about 50 ° was obtained. As shown in FIG. 6 showing the longitudinal section of the nib, the polyester fiber of the pen core material was melted and solidified by the heat of the carbon dioxide laser, and the melted and solidified layer 3 was formed in some places on the inner surface of the air hole 2.
[0021]
As is clear from comparison between FIG. 4 and FIG. 6, the formation of the melt-solidified layer 3 could be easily adjusted by a slight change in the processing conditions by forming the air holes by energy beam processing. .
[0022]
In FIG. 5, air holes similar to the air holes 2 formed on the front end side are also formed on the rear end side. When the tip end and the rear end shape of the pen tip are symmetric as shown in FIG. 5, the same air hole 2 formed on the tip end side is installed on the rear end side, so that the pen tip can be assembled at the time of pen assembly. There is no need to match the front and rear directions of the pen, and it can be used without any problem regardless of whether the tip of the pen tip or the rear end is arranged at the writing tip of the pen.
[0023]
FIG. 7 shows another embodiment of the nib of the present invention. The nib 1 is a porous nib having an outer diameter of 3.0 mm, a total length of 35 mm, and a porosity of 71%, in which nylon fibers are bundled and bonded with urethane resin. The shape of the tip is processed into a brush shape.
The air hole 2 penetrating the inside of the nib 1 is installed obliquely with respect to the axial direction.
[0024]
FIG. 8 shows another embodiment of the nib of the present invention. The nib 1 is a porous nib having an outer diameter of 5.0 mm, an overall length of 30 mm, and a porosity of 60%, in which acrylic fibers are focused and bonded with a melamine resin. The shape of the tip is processed into a bullet shape.
An air hole 2 penetrating the inside of the nib 1 is installed in parallel to the axial direction.
[0025]
FIG. 9 shows another embodiment of the marking nib of the present invention. The nib 1 is a porous material having an outer diameter of 6.7 mm, an overall length of 30 mm, and a porosity of 62%, in which polyester fibers are focused and bonded with an epoxy resin. It is a pen tip, and the shape of the tip is processed into a bullet shape. An air hole 2 penetrating the inside of the nib 1 is installed in parallel to the axial direction.
[0026]
【The invention's effect】
The nib having the air hole of the present invention obtained by the above configuration is an inner surface of the air hole penetrating the inside of the nib even when the air hole is provided in the porous nib that is deformed by stress. Has a strong solidified layer on the whole surface or partly, so that even when the pen tip is press-fitted into the pen body, the air holes are not easily crushed and effectively serve as air holes.
[0027]
In addition, by processing the air holes that penetrate the inside of the nib by energy beam processing, it is easy to form a melt-solidified layer simply by changing the processing conditions such as the type, output, and irradiation time of the energy beam. Can be adjusted. Moreover, since the machining can be performed in a short time of 300 ms or less, the work efficiency is good.
[Brief description of the drawings]
FIG. 1 is a pen tip showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a nib showing an embodiment of the present invention.
FIG. 3 is a longitudinal sectional view when the pen tip in one embodiment of the present invention is incorporated as a marking pen.
FIG. 4 is a scanning electron micrograph of a nib longitudinal section showing a state in which most of the inner surface of the air hole in the present invention is melted and solidified.
FIG. 5 is a pen tip showing another embodiment of the present invention.
6 is a scanning electron micrograph of a nib longitudinal section showing a state in which an inner surface of an air hole in the present invention is partially melted and solidified. FIG.
FIG. 7 is a pen tip showing another embodiment of the present invention.
FIG. 8 is a pen tip showing another embodiment of the present invention.
FIG. 9 is a pen tip showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pen tip 2 Air hole 3 Molten solidified layer 4 Pen body 5 Filling 6 Tail plug

Claims (2)

In the nib made of a porous body, the hole functioning as an air hole is formed so as to penetrate the inside of the nib, and the inner surface of the hole is entirely or partially melted and solidified, A nib with air holes. A method of manufacturing a nib having an air hole, wherein an air hole penetrating the inside of the nib made of a porous material is formed by energy beam processing.

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