JP7387389B2 - Pen nib member and writing instrument equipped with a nib member - Google Patents

Description

The present invention relates to a pen nib member whose tip edge has a shape in which curved lines with different curvatures are connected, and a writing instrument using the nib member.

As a pen nib that can draw wide lines, there is a pen nib shown in Patent Document 1 or Patent Document 2 in which two thin metal members are stacked on top of each other and the gap between the thin plates is used as an ink flow path, and a marking method. Fiber cores used in pens, etc., and brushes are known.

JP2000-335165 JP2001-328386

However, a pen tip made of overlapping metal plates or a fiber core as in Patent Document 1 or Patent Document 2 has a straight tip edge, and although it is possible to obtain a drawn line with a uniform width, the line width is Change is difficult. In addition, a brush is an example of a writing instrument whose line width can easily be changed, but since the width of the drawn line changes depending on the writing pressure and the height of the pen body, it is difficult to obtain a line with a uniform width by hand.
Therefore, the present invention provides a pen nib member that can easily change the line width, which is difficult to achieve as described above, and can write lines of uniform width, and does not require a complicated structure.

The present invention provides a writing instrument that includes a nib member whose tip edge is connected to a plurality of curved lines having different curvatures when viewed from the front. By having such a shape of the pen tip member, the contact area between the writing surface and the tip edge changes depending on the angle between the writing surface and the pen body when writing, and the line width changes according to the contact area. By combining this nib member with overlapping hard plate materials such as metal and capillary force, a drawn line with a uniform line width can be obtained by fixing the angle rather than the writing pressure.

Further, the writing portion that is in contact with the writing surface when viewed from the planar direction of the pen nib member has a straight portion, a curved surface portion, and an inclined taper portion, thereby providing a good writing feel.

Since the pen nib member of the present invention and the writing instrument equipped with the nib member are as described above, the width of the drawn line can be easily changed depending on the shape of the tip of the nib member, and the drawn line can be drawn with a uniform line width. It is also easy to write down. When characters are written with a pen body using this nib, expressive characters like a brush can be written more easily than with a brush.

FIG. 2 is an overall view of the writing instrument in Example 1 of the present invention, viewed from the front. 2 is a longitudinal cross-sectional view of FIG. 1. FIG. FIG. 3 is an enlarged view of the vicinity of the pen tip in Example 1 of the present invention. 4 is a longitudinal cross-sectional view of FIG. 3. FIG. FIG. 3 is an enlarged front view of the vicinity of the pen tip in Example 1 of the present invention. FIG. 3 is an enlarged view of the tip end edge of the pen tip in Example 1 of the present invention, viewed from a plane direction. This is a sheet-like film having capillary action and having microprotrusions in Example 2 of the present invention. This is an example in which the sheet-like film having capillary action shown in FIG. 7 is sandwiched between the thin metal members of the pen tip in Example 2 of the present invention. This is an example in which a notch is provided at the tip edge of the pen tip in Example 3 of the present invention. This is an example in which the curvature of the curved line at the tip edge of the pen nib in Example 4 of the present invention is increased and the length is shortened. This is an example in which the writing area of the tip edge of the pen nib in Example 5 of the present invention is provided symmetrically. This is an example in which the curvature of the writing area of the tip edge in Example 6 of the present invention is further increased. This is an example in which a pen nib suppressing portion is added to the joint in Example 7 of the present invention. This is an example in which the rear ends of the thin sheet metal members of the pen tip in Example 8 of the present invention are connected to form one sheet metal member. It is a state in which the thin plate metal member of the pen tip in Example 9 of the present invention is bent at the connection part.

FIG. 1 shows an overall view of a writing instrument 1 of Example 1 according to an embodiment of the present invention, viewed from the front direction. FIG. 2 shows a longitudinal cross-sectional view of the writing instrument 1 in the embodiment of the present invention. 3 is an enlarged view of the vicinity of the pen tip member 2 of the writing instrument 1, and FIG. 4 is a longitudinal sectional view of FIG. 3. Note that, when viewed from the front, the pen tip side is defined as the front side, and the other end side is defined as the rear side.

The writing instrument 1 has an ink guiding portion of a collector core 5 as an ink guiding core that secures a flow path for ink from an ink tank 4 in a pen nib member 2 formed by overlapping two thin metal members 2a and 2b. It is a writing instrument. The writing instrument 1 has a collector 6 that temporarily retains ink when internal pressure changes. The pen tip member 2 is inserted into the joint 3, and the joint 3 is press-fitted into the ink tank 4 to be fixed. The ink tank 4 is connected to the shaft cylinder 7.

The ink outflow structure of the writing instrument 1 is such that the ink in the ink tank 4 passes through the collector core 5 and flows through the ink channel 2c formed in the minute gap between the two thin metal members 2a and 2b that form the nib member 2. However, after reaching the tip edges 2d and 2e of the pen tip member 2, the ink is transferred from the gap at the tip of the pen tip member 2 to the paper surface. Furthermore, in this embodiment, the joint 3 is provided with an air groove 8, thereby providing a structure in which the ink flows out smoothly from the ink tank 4.

The ink used in each embodiment is an ink composition containing at least a colorant and water, and is made of a fatty acid or aromatic carboxylic acid prepared by adding 60 to 110 moles of alkylene oxide to glycerin having an average degree of polymerization of 1 to 10. It is preferred that at least one of ester sulfates, phosphates, and carboxylates be contained in an amount of 0.1 to 30% by weight based on the total amount of the ink composition. Further, it is preferable that the Newtonian viscosity ink has a viscosity of 1 to 10 mPa·S. Further, the surface tension is preferably in the range of 16 to 45 mN/m (measurement temperature: 25° C., measuring device: surface tension measuring device manufactured by Kyowa Kaimen Kagaku Co., Ltd.).

FIG. 5 shows an enlarged front view of the pen point member 2 and its vicinity. In FIG. 5, the tip edges 2d and 2e of the pen point member 2 have a shape in which a maximum curvature part 2f, a large curvature part 2g, a middle curvature part 2h, a small curvature part 2i, and a straight part 2j are smoothly connected. In this way, by creating a tip edge that smoothly connects a plurality of curves with different curvatures, it is possible to obtain a pen whose line width changes when the angle between the writing surface and the writing portion is changed. In this embodiment, since the pen tip member 2 is made of a hard material such as a metal member, the pen tip is unlikely to change due to low writing pressure like a brush, and only the angle between the writing surface and the writing part is fixed. It is possible to draw lines with a uniform line width without being affected by the writing load. Because the pen nib member 2 has such characteristics, expressive characters like a brush can be written more easily than with a brush.

FIG. 6 shows an enlarged view of the tip edges 2d and 2e of the pen tip member 2 shown in FIG. 5, viewed from the plane. The tip edges 2d and 2e have roughly similar shapes no matter where in the writing area the cross section is taken. In the example of FIG. 6, if we look at the cross section of the tip edges 2d and 2e of the pen nib member 2, which is the writing part, we can see that it is a linear region that is perpendicular to the plane of the thin metal members 2a and 2b, which is a straight part from the tip to the rear. 2k, connected to a curved surface area 2l which is a curved surface part, and further connected to inclined taper areas 2m and 2n which are inclined taper parts. In this way, by connecting the straight portion, the curved surface portion, and the inclined taper portion, a smooth and good writing feeling can be obtained instead of the hard writing feeling peculiar to metal. Further, by providing two or more stages of inclined taper portions, a good writing feeling can be obtained even when writing is performed by laying down the planes of the thin metal members 2a and 2b at an angle that tilts them.

It is desirable to use stainless steel material having a longitudinal elastic modulus of 160 to 220 GPa for the thin metal members 2a and 2b. The thickness of the thin metal members 2a and 2b is preferably 0.1 to 1 mm in order to obtain durability and writing feel.

FIG. 7 shows a sheet-like film 9 having a capillary action, which is a writing instrument component of Example 2, in which minute protrusions 9b having a height of 1 μm to 500 μm and widthwise spacing are formed on the surface of a base resin film 9a.

8 shows a second embodiment of a writing instrument in which a sheet-like film 9 having a capillary action shown in FIG. 7 is sandwiched between a minute gap 2c between the thin metal members 2a and 2b of the nib member 2. In this embodiment 2, ink flows by capillary force on the side of the sheet-like film 9 having capillary action, on which the microprotrusions 9b are formed. Therefore, by adjusting the capillary force by adjusting the height, gap, etc. of the microprotrusions 9b, the flow rate can be easily adjusted. Furthermore, by sandwiching the sheet-like film 9 having capillary action, it becomes easy to maintain an appropriate width of the minute gap 2c between the thin metal members 2a and 2b.

FIG. 9 shows a writing instrument of Example 3 in which notches 2o are formed in the tip edges 2d and 2e of the pen point member 2. By forming a plurality of notches 2o on the tip edges 2d and 2e in this way, when writing is done by laying down the flat surface of the thin metal members 2a and 2b at an angle, the ink can be transferred to the thin metal members 2a and 2e. You can go around the side of 2b and draw stable lines.

FIG. 10 shows a writing instrument of Example 4. In Example 4, compared to Example 3, the curvatures of the curved parts 2f to 2i of the writing areas 2f to 2j of the tip edges 2d and 2e of the pen nib member 2 are made larger and the lengths are made shorter, thereby increasing the drawing line width. It is possible to easily write smaller, more expressive letters by reducing changes.

FIG. 11 shows a writing instrument of Example 5. The writing areas 2f to 2j of the tip edges 2d and 2e of the pen nib member 2 are shaped symmetrically. By adopting such a shape, it is possible to write on both sides without being affected by the upper and lower gripping positions.

FIG. 12 shows the writing instrument of Example 6. The writing areas 2f to 2j of the tip edges 2d and 2e of Example 5 have a shape with a larger curvature. With this shape, you can stably write thinner lines similar to those of a ballpoint pen. Furthermore, by providing the non-writing portion 2p with a curved surface shape opposite to that of the writing areas 2f to 2j, it is possible to write thin lines even when writing at a low writing angle.

FIG. 13 shows a writing instrument of Example 7. 1 shows an embodiment of a writing instrument 1 in which a joint 3 is provided with a pen nib holding portion 3a. By adopting such a shape, it is possible to suppress the wobbling of the pen tip member 2 during writing, and it becomes possible to write more stable lines.

FIG. 14 shows a writing instrument of Example 8. It shows how the rear ends of the thin metal members 2a and 2b of the pen tip member 2 are connected to form a single sheet metal member 10.

FIG. 15 shows a writing instrument of Example 9. Different from Example 7, the thin metal member 10 is shown bent at the connection portion of two thin metal members 2a and 2b. With such a shape, effects similar to those of the present invention can be obtained, and the two pen nibs can be handled as one component, improving ease of assembly.

In Example 2, a sheet-like film 9 having a capillary action composed of slits or protrusions on the surface or inside is used as the ink flow path 2c, but it is necessary to obtain an appropriate capillary force. If possible, other forms of the minute gap-like ink flow path 2c between the thin metal members 2a and 2b can be adopted. For example, methods such as punching the thin metal members 2a and 2b to a certain height or adding grooves to the joint 3 to manage the gap can be considered. Alternatively, the ink flow path 2c may be formed by providing slits in the axial direction toward the tip edges 2d and 2e, such as hairline processing, on the surface of the thin metal members 2a and 2b on the ink flow path 2c side. be. By using this method in combination with the sheet-like film 9 having capillary action, the ink flowability can be further improved.

In addition, the writing instrument 1 has a collector 6 and a collector core 5, and has the appearance of a collector type writing instrument, but there are also forms in which the rear end of the nib member 2 is directly connected to the ink tank, and ink is passed through the filling. It is also possible to provide a form in which the following information is provided.

Further, the thin metal members 2a and 2b of the pen nib member 2 may be made of a material other than metal to achieve the same effect as the present invention. By using a hard resin material, a smoother writing feeling can be obtained. The hard resin material is preferably a self-lubricating resin such as POM, ABS, PC, PP, PE, PBT, PMMA, or boron nitride-containing resin. Therefore, there are three possible patterns for the pen nib members: two of them are made of metal, one of them is made of metal and one of them is made of resin, and both of them are made of resin. If only one piece is made of resin, large deformation of the pen tip can be suppressed by using metal on one side, but if both pieces are made of resin, a material with some hardness is suitable.

As in the example above, by using a resin material for the pen nib member 2, the microprotrusions 9b can be formed directly on the surface of the thin plate member on the ink flow path 2c side, and a sheet-like film with capillary action can be formed. Appropriate capillary force can be obtained without pinching 9.

1 writing implements
2 Pen tip parts
2a Sheet metal parts
2b Sheet metal parts
2c Micro-gap ink flow path
2d tip edge
2e Tip edge
2f Maximum curvature of tip edge
2g Large part of tip edge curvature
2h Middle part of tip edge curvature
2i Small curvature of tip edge
2j Tip edge straight part
2k Tip edge writing area straight line area
2l Tip edge side curved area
2m Tip edge side taper area
2n Tip edge side tapered area
2o cutout
2p non-writing part
3 fittings
3a Pen tip retainer
4 ink tank
5 collector wick
6 collector
7 Shaft cylinder
8 air groove
9 Sheet film with capillary action
9a resin film
9b Microprotrusion
10 Sheet metal parts

Claims (1)

When viewed from the front, the tip edge has a shape connecting a plurality of curved lines with different curvatures, and when viewed from the planar direction of the nib member, the writing part that contacts the writing surface has a straight part, a curved part, and an inclined part. A pen nib member characterized by having a tapered portion, and a writing instrument equipped with the nib member.

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