Nib unit, method for manufacturing nib unit, and liquid application tool using nib unit

Abstract

The invention provides a liquid coating tool which can stably coat a plurality of lines at one time, can easily control the coated lines, and is not easy to cause poor liquid discharge. Further provided is a nib unit in which the nib is less susceptible to distortion when the nib is assembled to the tip, and which is easier to assemble. Provided is a pen tip unit provided with: one pen tip comprising a monofilament having a tapered tip portion; and a pen tip provided so as to cover the outer periphery of the tip portion of the pen tip other than the tip side of the pen tip, the cross-section of the opening portion of the tip portion of the pen tip being elliptical or rounded rectangular, the opening portion of the tip portion of the pen tip being divided by one or more separators and having a plurality of holes formed therein, and the pen tip being provided so as to cover the outer periphery of the tip portion of the pen tip. In a cross section of the opening portion, the one or more separators are disposed in a short side direction of the opening portion, and in the pen tip, two ribs are formed on an inner side of the pen tip from a front end side to a rear end side of the pen tip with respect to the one separator. The two ribs are extended so as to be continuous with both end portions of the rear end of the separator on the pen mouth side and are formed so as to protrude in the short-side direction of the opening, and the longitudinal cross-sections of the separator and the ribs, which are sectioned in the short-side direction of the opening, have a substantially C-shape, and the longitudinal cross-sections of the two ribs are formed so as to protrude in the short-side direction of the opening. And the pen point of the pen point is branched along the plurality of holes of the pen mouth.

Description

Technical Field

[0001] The present invention relates to a nib unit used in a liquid application tool such as a cosmetic tool or a writing tool, a method for manufacturing the nib unit, and a liquid application tool using the nib unit. In particular, it relates to a liquid application tool capable of drawing multiple lines at once. Background Art

[0002] Liquid application tools include types that relay liquid from the rear end portion to the front end portion of the nib, types that impregnate the front end portion of the nib with liquid, and the like. Since these types of liquid application tools were first introduced to the market, they have been widely popular as indispensable tools in cosmetic tools, writing tools, and the like. In addition, among the nibs of liquid application tools of the type that relay liquid, there are known types that use a porous material and a bundle of synthetic fibers bonded with resin, types that bundle monofilaments with a tapered front end, and the like.

[0003] Conventionally, in such liquid application tools, when drawing multiple lines at once, a synthetic fiber core formed by bonding a bundle of synthetic fibers with resin is used. As shown on the left side of Figure 6 (a), an example is shown in which multiple synthetic fiber cores with their front end portions cut into an appropriate front end shape are arranged in a row, and the synthetic fiber cores are bonded to each other and inserted into the pen tip, or as shown on the right side of Figure 6 (a), an example is shown in which the front end of one synthetic fiber core is punched into a fork shape and inserted into the pen tip or the like. However, when using a synthetic fiber core, for example, when drawing a line on top of a foundation or a colored material, there is a problem that clogging or poor ejection of the foundation or the colored material occurs in the front end portion of the nib. This is because the space formed between the bonded fibers serves as a liquid conduction path, but when machining or punching the front end portion of the nib, the liquid conduction path in the front end portion is damaged or burrs are generated in the middle, thereby clogging the liquid conduction path and preventing the liquid from being smoothly supplied to the pen tip. At the same time, the particles of the applied foundation or colored material will adhere to and enter the front end portion of the nib, further clogging the liquid conduction path. In Figure 6 (b) and Figure 6 (c), examples of the front end portion of the nib of a synthetic fiber core clogged with foundation particles are shown. Moreover, compared with a pen tip formed by bundling monofilaments with a tapered front end, the synthetic fiber core has poor elasticity. Therefore, there is a problem that when drawing a pen line (a line), it cannot be finely controlled, and it is particularly difficult to adjust the thickness of the line.

[0004] In Patent Document 1, there is disclosed a liquid coating tool in which a plurality of porous materials such as the above synthetic fiber cores are arranged and inserted into a pen tip, and a plurality of lines can be drawn at once. However, since a plurality of pen tips are used for one liquid coating tool, there is a problem that the cost becomes high. Also, as described above, when the pen tip is a synthetic fiber core, if a line is drawn on the basis of applying a foundation or applying a coloring material, there is a problem that clogging or poor discharge of the foundation or coloring material occurs at the front end portion of the pen tip.

[0005] In Patent Document 2, there is disclosed a liquid coating tool that supplies liquid to a pen tip formed by bundling single filaments whose tips are tapered, using a relay core. However, since there is one front end portion of the pen tip, there is a problem that a plurality of lines cannot be drawn at once. Also, when drawing a plurality of lines separately, there are problems that it is difficult to control the coating lines and that lines of uniform thickness or width cannot be coated.

[0006] A method of using a plurality of pen tips formed by bundling single filaments whose tips are tapered and assembling them to a pen tip is being studied. However, since a relay core needs to be inserted into each pen tip, there is a physically difficult problem. When not using a relay core, it is necessary to supply liquid only by the weak capillary force of the pen tip, so there are problems such as unevenness easily occurring in the coating lines. Also, since a plurality of pen tips and a plurality of relay cores are used for one liquid coating tool, there is also a problem that the cost becomes even higher.

[0007] In Patent Document 3, there is disclosed a technique of fusing and connecting a plurality of synthetic fiber cores on the side opposite to the pen tip. However, similarly to Patent Document 1, since a plurality of pen tips are used for one liquid coating tool, there is a problem that the cost becomes high, or if a line is drawn on the basis of applying a foundation or applying a coloring material, there is a problem that clogging or poor discharge of the foundation or coloring material occurs at the front end portion of the pen tip. Prior Art Documents Patent Documents

[0008] Patent Document 1: Utility Model Registration No. 3137562 Gazette Patent Document 2: Japanese Utility Model Laid-Open No. 7-35084 Gazette Patent Document 3: Japanese Patent Laid-Open No. 2010-207301 Gazette Summary of the Invention Technical Problem to be Solved by the Invention

[0009] The present invention has been completed in view of the above circumstances, and the problem is to provide a liquid coating tool that can stably coat a plurality of lines at once, is easy to control the coating lines, and is less likely to have poor discharge of liquid. Furthermore, the problem lies in providing a nib unit in which the nib is not easily distorted and assembly is easier when the nib is assembled to the pen tip. Means for Solving the Technical Problem

[0010] To solve the above problems, the nib unit of the present invention is characterized by comprising: a single nib formed of a monofilament having a tapered front end portion; and a pen tip provided to cover the outer periphery of a portion of the front end portion of the nib other than the writing tip on the front end side, the cross section of the opening portion of the front end portion of the pen tip being elliptical or rounded rectangular, the opening portion of the front end portion of the pen tip being divided by one or more partition members and having a plurality of holes formed therein, in the cross section of the opening portion, one or more of the partition members being arranged in the short side direction of the opening portion, in the pen tip, two rib portions are formed on the inner side of the pen tip from the front end side to the rear end side with respect to the one partition member, the two rib portions being continuously extended in a manner continuous with both end portions on the pen tip side of the rear end portion of the partition member and being formed to protrude in the short side direction of the opening portion, the shapes of the longitudinal sections of the partition member and the rib portions, which are cut along the short side direction of the opening portion, being substantially C-shaped, and the writing tip of the nib being bifurcated along the plurality of holes of the pen tip.

[0011] There may be two of the partition members and three of the holes.

[0012] The cross section of the rib portion may be chamfered in the outer direction, the inner direction, or both the outer and inner directions.

[0013] The amount of protrusion of the rear end side of the rib portion from the inner side of the pen tip may be smaller than the amount of protrusion of the front end side of the rib portion from the inner side of the pen tip.

[0014] The rear end portion of the rib portion is preferably located on the front end side with respect to the rear end portion of the pen tip.

[0015] The partition member may be integrally formed with the pen tip having the rib portion.

[0016] The nib unit may further include a relay core, and the outer periphery of the front end portion of the relay core is covered by the rear end portion of the nib.

[0017] The material of the nib is preferably a polyester tapered filament or a nylon tapered filament.

[0018] The manufacturing method of the nib unit of the present invention is characterized by including: a step of inserting the nib from the rear end portion of the pen tip; and a step of bifurcating the writing tip of the nib along the rib portion of the pen tip and the plurality of holes of the opening portion of the front end portion of the pen tip.

[0019] It may further include the step of inserting the front end portion of the relay core into the rear end portion of the nib.

[0020] The liquid coating tool of the present invention is characterized by using the above-described nib unit. Advantages of the Invention

[0021] According to the present invention, it is possible to provide a liquid coating tool that can stably coat multiple lines at one time, is easy to control the coated lines, and is less likely to have poor liquid ejection. Since there are no burrs generated in the cutting or punching process of the pen tip, it is not easy to block the liquid conduction path, and the liquid can be smoothly supplied to the front end portion of the nib. Furthermore, particles such as the applied foundation or coloring material are not easily attached to the front end of the nib, and even if it is assumed that particles are attached, they will easily return to their original state due to the flow of the supplied liquid. Therefore, from this perspective, it is not easy to block the liquid conduction path, and the liquid can be smoothly supplied to the front end portion of the nib. And, compared with a synthetic fiber core, the nib can be made elastic, so it is possible to provide a liquid coating tool that can control the pen line from a thin line to a thick line. Furthermore, since there is only one expensive nib used as a component, the manufacturing cost can be suppressed. Furthermore, when assembling the nib to the pen tip, the nib is not easily distorted, the assembly becomes easier, and the pen tip can be forked at the target ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An example of a schematic diagram showing the nib unit of the present invention. Figure 1 (a) is a side view when observed from the short side direction of the opening at the front end portion of the pen tip, Figure 1 (b) is a side view when observed from the long side direction of the opening at the front end portion of the pen tip, and FIG. (c) is a perspective view. Figure 2 An example of the pen tip of the present invention is shown. Figure 2 (a) is a side view of the pen tip observed from the front end portion side, Figure 2 (b) is a longitudinal sectional view taken along the long side direction in such a way as to pass through the center of the short side of the opening at the front end portion of the pen tip, Figure 2 (c) is a side view of the pen tip observed from the rear end portion side, Figure 2 (d) is a longitudinal sectional view taken along the short side direction of the opening at the front end portion of the pen tip, Figure 2 (e) is Figure 2 (b) perspective view. Figure 3 An example of the pen tip of the present invention is shown. It is a cross-sectional view of the portion where the ribs of the pen tip are formed, observed from the rear end side of the pen tip, Figure 3 (a) is an example where the cross-section of the rib is chamfered outward, Figure 3(b) is an example in which the cross section of the rib is chamfered in both the outer and inner directions. Figure 3 (c) is an example in which the cross section of the rib is chamfered in the inner direction. Figure 4 Shows an example of the nib of the present invention. Figure 4 (a) is a longitudinal sectional view taken along the long side direction in such a way as to pass through the center of the short side of the opening at the tip of the nib. Figure 4 (b) is a longitudinal sectional view taken along the short side direction of the opening at the tip of the nib. Figure 5 Among them, Figure 5 (a) shows an example of a longitudinal sectional view of the liquid application tool of the present invention. Figure 5 (b) shows an example of a longitudinal sectional view of the nib unit of the present invention. Figure 6 Shows an example of a nib unit using a synthetic fiber core of the prior art example. Figure 6 On the left side of (a) is a view in which multiple synthetic fiber cores are assembled, and on the right side is a view in which the tip of one synthetic fiber core is formed into a fork shape. Figure 6 (b) is the nib when applying with a synthetic fiber core on a face coated with foundation. Figure 6 (c) is Figure 6 (b) is an enlarged cross section. Figure 7 Shows an example of a liquid application tool using a synthetic fiber core of the prior art example. Figure 7 (a) is a longitudinal sectional view. Figure 7 (b) is a cross sectional view of the opening at the tip of the nib. Figure 8 Shows an example of a nib of the prior art example. Figure 8 (a) is a cross sectional view of the opening at the tip of the nib. Figure 8 (b) is a longitudinal sectional view cut along the long side direction in such a way as to pass through the center of the short side of the opening at the tip. Figure 8 (c) is a longitudinal sectional view cut along the short side direction in such a way as to pass through the center of the long side of the opening at the tip. Figure (d) is a perspective view. Figure 9 Shows an example of a nib for a nib unit using a monofilament bundle of the prior art example. Figure 9 (a) is a cross sectional view of the opening at the tip of the nib. Figure 9 (b) is a side view. Figure 9 (c) is a longitudinal sectional view. Figure 10 Shows an example of the assembly process of a nib for a nib unit using a monofilament bundle of the prior art example. Figure 10 (a) is the process of preparing the nib, the nib tip, and the relay core.Figure 10 (b) is the process of inserting the nib from the rear end of the pen tip holder, Figure 10 (c) is the process of inserting the relay core into the rear end portion of the nib. Figure 11 An example of the manufacture (assembly) of a nib unit using a bundle of monofilaments of multiple prior art examples is shown. Figure 11 (a) is a diagram showing the preparation of a pen tip holder and multiple nibs, Figure 11 (b) is a diagram showing the assembly of multiple nibs from the rear end of the pen tip holder. Figure 12 An example of a nib unit using a pen tip holder of a prior art example is shown. In Figure 12 (a), a photograph is shown immediately after inserting a nib of a bundle of monofilaments into three holes provided by two partitions at the opening of the pen tip holder. In Figure 12 (b), a photograph is shown after applying rotation for assembly. Figure 13 An example of a nib unit using a pen tip holder of a prior art example is shown. In Figure 13 (a), a photograph is shown immediately after inserting a nib of a bundle of monofilaments into three holes provided by two partitions at the opening of the pen tip holder. In Figure 13 (b), a photograph is shown of the front end portion of the nib that is not covered by the pen tip holder after cutting and taken from the front end side. Detailed Description of the Invention

[0023] The nib unit of the present invention includes a nib and a pen tip holder. An example is shown in Figures 1 to 5 . Hereinafter, it will be described with reference numerals, but the present invention is not limited thereto. In addition, in the present application specification, the "front end portion" refers to the foremost end portion (position) on the pen tip side of the liquid application tool in each part or portion, the "rear end portion" refers to the rearmost end portion (position) on the side opposite to the pen tip of the liquid application tool in each part or portion, the "front end part" refers to the front end portion and the adjacent part of the front end portion in each part, and the "rear end part" refers to the rear end portion and the adjacent part of the rear end portion in each part. Also, the "front end side" refers to the pen tip side, and the "rear end side" refers to the side opposite to the pen tip.

[0024] (Structure of the Nib) As Figure 1 illustrated, the nib 3 of the present invention is provided for using the liquid supplied from the rear end of the nib 3 by the relay core 4 described later or the liquid impregnated in the front end part of the nib 3 and for taking notes with the pen tip of the front end part of the nib 3. The nib 3 is defined by the pen tip holder 2 or the like that covers the outer periphery of the part other than the pen tip in the front end part of the nib 3. And one nib is inserted into one pen tip holder 2. The pen tip of the nib 3 branches along multiple holes of the pen tip holder 2 described later.

[0025] The nib 3 is composed of a single filament whose front end portion is tapered. Regarding the material of the nib 3, as long as it is a tapered single filament, there is no particular limitation and it can be arbitrarily selected. As an example of the material of the nib 3, there can be mentioned tapered filaments made of PBT (polybutylene terephthalate), tapered filaments made of PET (polyethylene terephthalate), tapered filaments made of PTT (polytrimethylene terephthalate) and other polyester tapered filaments, nylon tapered filaments, tapered filaments made of PPS (polyphenylene sulfide), tapered filaments made of fluororesin, etc. Among them, from the viewpoint of versatility, tapered filaments made of PBT (polybutylene terephthalate) and nylon tapered filaments are preferred.

[0026] The diameter of the single filament of the nib 3 is appropriately set according to the use or purpose of the liquid application tool 10 using this nib unit 1. From the viewpoint of writing feel or touch, the range of 0.05 to 0.30 mm is preferred, and the range of 0.10 to 0.20 mm is more preferred.

[0027] In order to form a structure in which the rear end portion of the nib 3 covers the outer periphery of the front end portion of the relay core 4, for example, the method of inserting the relay core 4 into the nib 3 can be adopted. In order to make it easy to insert the relay core 4 into the nib 3, it is preferred to provide a hole at the rear end portion of the nib 3. The diameter of this hole is the same as or slightly smaller than the outer diameter of the front end side of the relay core 4. As long as it can be inserted by the elastic force of the relay core 4, the diameter of the hole of the nib 3 can be slightly smaller than the outer diameter of the front end side of the relay core.

[0028] In order to arrange the pen tip 2 that covers the outer periphery of the portion other than the tip of the front end portion of the nib 3 so as not to be misaligned with the rear end portion of the nib 3, it is preferred that the pen tip 2 for the nib 3 covers not only the front end portion but also the outer periphery of all portions (including the rear end portion) other than the tip, or it is preferred to provide a flange portion at the rear end portion of the nib 3. This flange portion can fix the position of the rear end portion of the pen tip 2. The hole and the flange portion can be provided, for example, by cutting a single filament bundle whose front end portion is tapered into a predetermined length (slightly longer than the total length of the nib) at the rear end portion, fusing the cut surface by heating, forming a flange portion during the fusing, hollowing out the central portion of the fused cut surface into a circular shape with the diameter of the hole of the nib 3, and taking out and removing together with the single filament fused to the central portion of the hollowed out cut surface.

[0029] In addition, as long as it is a structure capable of fixing the nib 3, it can also be a structure in which the outer periphery of the rear end portion of the nib 3 is not covered by the pen tip 2.

[0030] Regarding the shape of the cross-section of the nib 3, as long as it can be inserted along the shape of the cross-section of the inner side of the rear end portion of the pen tip 2 described later, there is no particular limitation, and examples include a circle, an ellipse, a square, a rectangle, or a rounded polygon. Among them, from the viewpoint of easily and smoothly inserting the tip of the nib 3 into the pen tip 2, a rounded circle or ellipse, or a rounded polygon is preferred.

[0031] (Structure of the pen tip) The pen tip 2 of the present invention is provided to cover the outer periphery of the portion other than the tip of the front end portion of the nib 3. With Figure 2 An example of the structure of the pen tip 2 will be described. Figure 2 (a) is a side view of the pen tip 2 observed from the front end portion side, Figure 2 (b) is a longitudinal sectional view taken along the long side direction in such a manner as to pass through the center of the short side of the opening portion of the front end portion of the pen tip 2, Figure 2 (c) is a side view of the pen tip 2 observed from the rear end portion side, Figure 2 (d) is a longitudinal sectional view taken along the short side direction of the opening portion of the front end portion of the pen tip 2, Figure 2 (e) is Figure 2 A perspective view of (b). As Figure 2 (a) to Figure 2 (e) show, the cross-section of the opening portion of the front end portion of the pen tip 2 is an ellipse or a rounded rectangle. And the opening portion of the front end portion of the pen tip 2 is divided by one or more partition members 21, and a plurality of holes are formed. Further, in the cross-section of the opening portion of the front end portion of the pen tip 2, one or more partition members 21 are arranged in the short side direction of the opening portion. Furthermore, in the pen tip 2, with respect to one partition member 21, two rib portions 22 are formed on the inner side of the pen tip 2 from the front end side to the rear end side of the pen tip 2. The two rib portions 22 are extended and provided in a manner continuous with the two end portions on the pen tip 2 side of the rear end portion of the partition member 21, and are formed to project in the short side direction of the opening portion of the front end portion of the pen tip 2. The shape of the longitudinal section of the partition member 21 and the two rib portions 22 formed on the partition member 21, taken along the short side direction of the front end portion of the pen tip 2, is substantially C-shaped. The rear end portion of the partition member 21 and the rib portions 22 may be continuously angled and stepwise as Figure 2 (d), Figure 2 (e), or may be continuously while smoothly bending.

[0032] Examples of the shape of the cross-section of the inner side of the rear end portion of the pen tip 2 include a circle, an ellipse, a square, a rectangle, or a rounded polygon. Among them, from the viewpoint of easily and smoothly inserting the tip of the nib 3 into the pen tip 2, a rounded circle or ellipse, or a rounded polygon is preferred. The inner diameter of the cross-section of the opening at the rear end of the pen tip 2 is exemplified to be about 2.5 mm to 5.0 mm.

[0033] Since the cross-section of the front end of the pen tip 2 is elliptical or rounded rectangular, the length 2a of the short side of the opening at the front end of the pen tip 2 is smaller than the length (inner diameter) of the short side of the cross-section of the opening at the rear end. It is exemplified to be about 1.8 mm to 4.0 mm. And the length 2b of the long side of the opening at the front end of the pen tip 2 is the same as or slightly smaller than the length (inner diameter) of the long side of the cross-section of the opening at the rear end, and is exemplified to be about 2.5 mm to 5.0 mm.

[0034] One or more partitions 21 are arranged in parallel with the opening at the front end of the pen tip 2, and the length direction of the cross-section of the partition 21 becomes the short side direction of the opening at the front end of the pen tip 2. However, as Figure 2 (a) to Figure 2 (b) shows, it is exemplified that three holes are formed in the opening at the front end by using two partitions 21. In this case, the thickness 21a of the partition 21 is exemplified to be about 0.3 mm to 1.0 mm, and the length of the longitudinal section of the partition 21 (the depth of the partition) 21b is exemplified to be about 0.5 mm to 3.0 mm. The two partitions 21 are preferably formed to be spaced apart from each other at substantially equal intervals along the long side of the opening at the front end of the pen tip 2. The lengths (2b1, 2b2, 2b3) of the holes in the long side direction of the cross-section of the opening at the front end of the pen tip 2 are exemplified to be about 0.3 mm to 1.5 mm. In addition, when making the amount of bifurcation of the hair bundle of the pen tip 3 uniform, it is preferably set such that 2b1 = 2b3 > 2b2 so that the areas of the holes in the cross-section are substantially the same. And when setting the amount of bifurcation of the hair bundle of the pen tip 3 to a target amount, it is preferable to adjust the lengths (2b1, 2b2, 2b3) of the holes in the long side direction of the cross-section of the opening at the front end of the pen tip 2 and the thickness 21a of the partition 21.

[0035] The rib 22 formed inside the pen tip 2 is arranged from the rear end of the partition 21 toward the rear end direction. Since the rib 22 is continuous with the partition 21, the thickness 22c of the rib 22 is preferably set to be the same as the thickness 21a of the partition 21.

[0036] Regarding the length 22b of the rib 22, it is sufficient if it is at least such that the tip of the nib 3 can be smoothly bifurcated and inserted into the separator 21. Further, the rib 22 may be formed up to the rear end portion of the nib 2. However, since it is slightly difficult for the nib 3 to be inserted from the rear end side of the nib 2, the rear end portion of the rib 22 is preferably disposed near the center of the nib 2. That is, the rear end portion of the rib 22 is preferably located on the front end side with respect to the rear end portion of the nib 2. Therefore, the length 2c of the nib 2 is exemplified as being about 10 mm to 20 mm. However, when the length 2c of the nib 2 is 11.6 mm, the length 22b of the rib 22 is preferably 1.0 mm to 11.6 mm, more preferably 1.5 mm to 11.0 mm, and about 3.0 mm to 7.0 mm.

[0037] The height 22a of the rib 22 is exemplified as being about 0.3 mm to 2.0 mm, but more preferably about 0.4 mm to 1.0 mm. If the amount of protrusion in the short side direction of the opening portion at the front end portion of the nib 2, that is, the height 22a of the rib 22, is too small, the bifurcation of the tip of the nib 3 at the separator 21 cannot be smoothly performed. Further, if the height 22a of the rib 22 is too large, when the nib 3 is inserted, the tip of the nib 3 will hit the rear end portion of the rib 22, and thus it is difficult to smoothly bifurcate.

[0038] Further, as Figure 3 (a) to Figure 3 (c) show, chamfering may be performed on the cross section of the rib 22. Figure 3 is a cross-sectional view of a portion of the nib having the rib as viewed from the rear end side of the nib, Figure 3 (a) is an example in which the cross section of the rib 22 is chamfered outward, Figure 3 (b) is an example in which the cross section of the rib 22 is chamfered in both the outward and inward directions, Figure 3 (c) is an example in which the cross section of the rib 22 is chamfered inward. The shape of the cross section of the rib 22 can adjust the amount of bifurcation of the tuft of the tip of the inserted nib 3. That is, as Figure 3 (a) shows, by chamfering the cross section of the rib 22 outward, the areas of the three holes can be made substantially the same. That is, the area of the central hole can be reduced, and the areas of the two outer holes can be adjusted to be larger. Conversely, as Figure 3 (c) shows, by chamfering the cross section of the rib 22 inward, the area of the central hole can be adjusted to be larger. When it is desired to make a difference in the amount of bifurcation of the tufts of the three holes to increase the amount of bifurcation of the tuft of the central hole, it is sufficient to chamfer inward. The amount of chamfering may be within the range of the height 22a of the rib 22. When the rib height 22a is 0.4 mm or more, 0.2 mm to 0.4 mm etc. are exemplified.

[0039] Furthermore, as shown in Figure 4 (a) and Figure 4 (b), the height 22a of the rib 22 can also be formed to be inclined so that the protruding amount of the rear end side of the rib 22 from the inside of the pen tip 2 is smaller than the protruding amount of the front end side of the rib 22 from the inside of the pen tip 2. For example, the protruding amount (rib height) of the front end portion can be 0.7 mm, and the protruding amount (rib height) of the rear end portion can be 0.1 mm. Alternatively, the protruding amount (rib height) of the front end portion can be 1.0 mm, and the protruding amount (rib height) of the rear end portion can be 0.4 mm. By reducing the protruding amount (rib height) of the rear end portion, the pen tip 3 can be gradually and smoothly guided and forked.

[0040] The separator 21 can be integrally formed with the pen tip 2 having the rib 22.

[0041] Regarding the material of the pen tip 2, there is no particular limitation as long as the pen tip can be fixed, and ABS resin, PP resin, etc. can be used. In addition, the outer shape of the pen tip 2 is designed in consideration of the shape of the liquid application tool that houses this pen tip unit.

[0042] (Structure of the relay core) The relay core 4 is a core designed to supply liquid from the rear end portion of the pen tip 3, that is, to "relay" the liquid to the pen tip 3, and the front end portion is ground into a conical shape. The rear end portion of the relay core 4 is immersed in the liquid, and the liquid is sucked to the front end side by the capillary force of the relay core 4. The front end portion of the relay core 4 is covered by the pen tip 3, and the liquid sucked up by the capillary force is supplied to the pen tip. The outer periphery of the front end portion of the relay core 4 is covered by the rear end portion of the pen tip 3.

[0043] Regarding the material of the relay core 4, any material having a porous shape and capable of supplying liquid to the pen tip 3 by capillary force can be arbitrarily selected. As an example, nylon fiber, polyester fiber, acrylic fiber, or a mixed fiber thereof can be cited. In addition, there is no particular limitation on the porosity of the relay core 4, and for example, a porosity of about 30 to 90% is appropriately selected. In addition, examples of the material of the relay core 4 include polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate, polyacetal, polyamides such as nylon, polyethylenes, polypropylenes, acrylic resins, polyvinyl chlorides, polystyrenes, polyvinyl acetates, polyurethanes, Teflon (registered trademark), ABS resin, AS resin, polyphenylene sulfide, polysulfone, polyether sulfone, polyether ether ketone, polyimide, etc. as porous materials. The size of the relay core 4 is appropriately set according to the cross-sectional shape or cross-sectional area of the rear end portion of the inserted nib 3, the use of the liquid application tool 10, etc., and is preferably about 1.5 mm to 3.0 mm in diameter and about 25 mm to 60 mm in length.

[0044] (Nib unit) The nib unit 1 includes one nib 3 as described above and a nozzle 2 provided to cover the outer periphery of a portion of the front end portion of the nib 3 other than the tip side nib. A plurality of holes are formed in the opening portion of the front end portion of the nozzle 2 divided by one or more partition members, and the nib of the nib 3 bifurcates along the holes (see Figure 1 ). Further, the nib unit 1 further includes a relay core 4, and may have a structure in which the outer periphery of the front end portion of the relay core 4 is covered by the rear end portion of the nib 3.

[0045] The method of assembling (manufacturing) the nib unit 1 includes: a step of inserting the nib 3 from the rear end portion of the nozzle 2; and a step of bifurcating the nib of the nib 3 along the ribs 22 of the nozzle 2 and the plurality of holes in the opening portion on the front end side. Further, it may also include a step of inserting the front end portion of the relay core 4 into the rear end portion of the nib 3. Here, if the nib of the nib 3 is bifurcated along the plurality of holes in the opening portion of the nozzle 2, the nib will become scattered, but if liquid is supplied, the fibers of the nib will stick together, so that lines corresponding to the number of holes can be clearly drawn. In addition, for visual inspection at the time of delivering the parts, etc., it may also include a step of trimming the front ends of the bifurcated nibs. For example, by dipping the front ends of the respective nibs in a 0.1% aqueous solution of PVA (polyvinyl alcohol), the fibers can be bonded to each other by surface tension to trim the shape.

[0046] (Liquid application tool) The nib unit 1 of the present invention can be applied to various liquid application tools 10 such as cosmetic tools or writing tools. For example, it can be applied to liquid cosmetic application tools such as eyeliner pens, eyeshadow pens, eyebrow pencils, lip liners, lip glaze pens, concealer pens, nail care products, and lash care products. And, for example, it can be applied to liquid application tools for writing such as oil-based markers, water-based markers, whiteboard markers, line markers, paint markers, correction pens, medical markers, and liquid application tools for applying liquid medicines. Examples

[0047] (Evaluation test) - Preparation of evaluation specimens - The nozzles 2 shown in Table 1A and Table 1B were prepared as Specimens 1 - 26. Among them, Specimen 1 is a comparative example without ribs. In addition, the pen tip 2 used in the evaluation is formed by the following specifications: Material: polypropylene, Processing method: injection molding (the partition and ribs are also integrally molded), Length 2c of the pen tip in the longitudinal section: 11.6 mm, Inner diameter of the rear end of the pen tip 2: 3.2 mm, Number of partitions 21: 2, Number of holes: 3, Area of the outer hole: 1.24 mm 2 , Area of the central hole 1.225 mm 2 , Rib height 22a: 0.4 mm to 1.0 mm, Rib length 22b: 1.5 mm to 11.6 mm, Cross-sectional shape of the rib: chamfered in both the outer direction, the inner direction, or both the outer and inner directions, Rib thickness 22c: 0.5 mm, Partition thickness 21a: 0.5 mm, Partition length 21b: 0.5 mm to 3.0 mm. The pen nib 3 used in the evaluation has a total length of 18.2 mm, a flange diameter of 3.9 mm, a root diameter: 3.2 mm, a hole: 1.45 mm, a flange thickness of 0.66 mm, Material: PBT (polybutylene terephthalate) conical filament, Diameter of a single filament: 0.15 mm. The material of the relay core 4 used in the evaluation: polyester fiber and polyurethane resin, Fiber diameter: 5 denier, Porosity: 60%. Regarding the assembly of the pen tip unit 1, it is carried out as follows: Insert the relay core 4 into the hole at the rear end of the pen nib 3, insert the pen nib 3 assembled with the relay core 4 into the pen tip 2, immerse the front part (the writing tip) of the pen nib 3 in a 0.1% aqueous solution of PVA (polyvinyl alcohol), adjust the shape, and dry it.

[0048] - Anti-twist evaluation test - After assembling the pen tip unit 1, a force is applied to the pen nib 3 in the rotational direction around the axis of the pen tip unit 1, and the twisting condition of the pen nib 3 is evaluated. No twist is designated as ◎, slight twist as ○, and twist as ×. The evaluation results of the anti-twist property are shown in Table 1A and Table 1B. In addition, in the case of Specimen 1 (Comparative Example 1), as Figure 12 (a) shows, if a force is applied to the pen nib 3 in the rotational direction, then as Figure 12 (b) shows, twist will occur.

[0049] - Assembly property evaluation test - In the preparation of the above-mentioned evaluation specimens, the assembly property was evaluated when using a jig during the assembly of the pen tip unit 1 to align the central axis of the pen nib 3 with the central axis of the pen tip 2 and insert the pen nib 3 straight into the pen tip 2. Most that can be assembled in one attempt are marked as ◎, those that can be assembled through multiple attempts are marked as ○, those that can be assembled after repeated attempts are marked as △, and those that cannot be assembled are marked as ×. The evaluation results of the assembly property are shown in Table 1A and Table 1B. In addition, in the case of Specimen 1 (Comparative Example 1), as Figure 13 (a), Figure 13 (b) shows, there was a deviation in the amount of forking of the hair bundle at the tip of the nib 3.

[0052] For Tables 1A and 1B, for easier comparison, Table 2 shows those with only the rib length 22b changed, Table 3 shows those with only the rib height 22a changed, Table 4 shows those with only the cross-sectional shape of the rib 22 changed, Table 5 shows those with an inclination in the rib height 22a, and Table 6 shows those with only the separator length 21b changed.

[0058] Furthermore, for the specimens in Tables 1A and 1B where the cross-sectional shape of the rib 22 has a 0.4 mm chamfer in the outer direction and the separator length 21b is 1 mm, from the viewpoints of the rib height 22a and the rib length 22b, the evaluation results of anti-twist performance and assemblability are shown in Tables 7 and 8. In addition, the serial numbers in the tables are Specimen No.

[0059] [Table 7] Cross-sectional shape of rib: 0.4 mm chamfer in outer direction Separator length (21b): 1 mm

[0060] [Table 8] Cross-sectional shape of rib: 0.4 mm chamfer in outer direction Separator length (21b): 1 mm

[0061] As can be seen from Table 2, Specimen 1 (Comparative Example 1) could not prevent twisting. In contrast, Specimens 4, 7, and 11 with the rib 22 had anti-twist performance. In particular, like Specimen 7, the structure where the rear end of the rib 22 is near the center of the pen tip 2 had high evaluations for both anti-twist performance and assemblability.

[0062] According to Table 3, Specimen 7 with a structure where the rib height 22a is 0.7 mm had high evaluations for both anti-twist performance and assemblability.

[0063] According to Table 4, the shape in which the cross-section of the rib 22 is chamfered outward has a high evaluation in terms of anti-twist performance and assembly performance compared to the shape of Specimen 17 in which the cross-section is chamfered inward or Specimen 16 in which the cross-section is chamfered in both the outward and inward directions.

[0064] According to Table 5, Specimen 18 with an inclined rib height has a high evaluation in terms of anti-twist performance and assembly performance. Specimen 19 has a high evaluation result in both anti-twist performance and assembly performance.

[0065] According to Table 6, Specimens 20 and 7 with a separator length 21b of 1.0 mm or less have a high evaluation in terms of anti-twist performance and assembly performance compared to Specimens 25 and 26 with a separator length 21b of 2.0 mm or more.

[0066] As shown in Table 7, the anti-twist performance is improved by having the rib 22. And as shown in Table 8, if the rib length 22b is 9 mm or more and the rib height 22a is substantially more than 1 mm, the assembly performance slightly deteriorates.

[0067] The present invention may have the following configurations. [Item 1] A nib unit, comprising: One nib, composed of a monofilament whose tip portion is tapered; and A nozzle, arranged to cover the outer periphery of the tip portion of the nib except for the tip side writing edge, The cross-section of the opening portion at the tip of the nozzle is an ellipse or a rounded rectangle, The opening portion at the tip of the nozzle is divided by one or more separators and has a plurality of holes formed therein, In the cross-section of the opening portion, one or more of the separators are arranged in the short side direction of the opening portion, In the nozzle, two ribs are formed on the inner side of the nozzle from the tip side to the rear end side with respect to one separator, and the two ribs extend continuously with the two end portions on the nozzle side of the rear end portion of the separator and are formed to protrude in the short side direction of the opening portion, The shapes of the longitudinal sections of the separator and the ribs, which are cut along the short side direction of the opening portion, are substantially C-shaped, The writing edge of the nib bifurcates along the plurality of holes in the nozzle. [Item 2] The nib unit according to Item 1 above, wherein There are two separators and three holes. [Item 3] The nib unit according to item 2 above, wherein, The cross-section of the rib is chamfered in the outer direction, the inner direction, or both the outer and inner directions. [Item 4] The nib unit according to any one of items 1 to 3 above, wherein, The protruding amount of the rear end side of the rib from the inner side of the pen tip is smaller than the protruding amount of the front end side of the rib from the inner side of the pen tip. [Item 5] The nib unit according to any one of items 1 to 4 above, wherein, The rear end portion of the rib is located on the front end side relative to the rear end portion of the pen tip. [Item 6] The nib unit according to any one of items 1 to 5 above, wherein, The separator is integrally formed with the pen tip having the rib. [Item 7] The nib unit according to any one of items 1 to 6 above, further comprising a relay core, The outer periphery of the front end portion of the relay core is covered by the rear end portion of the nib. [Item 8] The nib unit according to any one of items 1 to 7 above, wherein, The material of the nib is a polyester conical filament or a nylon conical filament. [Item 9] A method for manufacturing a nib unit, which is the method for manufacturing the nib unit according to item 1 above, comprising: A step of inserting the nib from the rear end portion of the pen tip; and A step of bifurcating the tip of the nib along the rib of the pen tip and the plurality of holes of the opening portion of the front end portion of the pen tip. [Item 10] The method for manufacturing a nib unit according to item 9 above, further comprising a step of inserting the front end portion of the relay core into the rear end portion of the nib. [Item 11] A liquid coating tool using the nib unit according to any one of items 1 to 9 above. Symbol description

[0068] 1 - Tip unit, 2 - Nozzle, 21 - Separator, 22 - Rib, 2a - Length (inner diameter) of the short side of the opening at the front end of the nozzle, 2b - Length (inner diameter) of the long side of the opening at the front end of the nozzle, 2b1, 2b2, 2b3 - Length of the hole in the long side direction of the cross section of the opening at the front end of the nozzle, 2c - Length of the nozzle in the longitudinal section, 21a - Separator thickness, 21b - Separator length, 22a - Rib height, 22b - Rib length, 22c - Rib thickness, 3 - Tip, 4 - Relay core, 10 - Liquid application tool, 100 - Liquid application tool of the prior art example, 102 - Nozzle of the prior art example, 102a - Length of the short side of the opening at the front end of the nozzle of the prior art example, 102b - Length of the long side of the opening at the front end of the nozzle of the prior art example, 102c - Length of the nozzle of the prior art example in the longitudinal section, 201 - Tip unit of the prior art example, 202 - Nozzle of the prior art example, 301 - Tip unit of the prior art example.

Claims

1. A nib unit, characterized in that, Comprising: 1 nib, composed of a monofilament with a tapered front end portion; and a pen tip, arranged to cover the outer periphery of the front end portion of the nib except for the pen tip on the front end side, the cross-section of the opening portion at the front end of the pen tip is oval or rounded rectangular, the opening portion at the front end of the pen tip is divided by one or more partition members and has a plurality of holes formed, in the cross-section of the opening portion, one or more of the partition members are arranged in the short side direction of the opening portion, in the pen tip, with respect to the one partition member, two rib portions are formed on the inner side of the pen tip from the front end side to the rear end side, and the two rib portions are arranged to extend continuously with both end portions on the pen tip side of the rear end portion of the partition member and are formed to protrude in the short side direction of the opening portion, the shapes of the longitudinal cross-sections of the partition member and the rib portion, cut along the short side direction of the opening portion, are substantially C-shaped, the pen tip of the nib bifurcates along the plurality of holes in the pen tip.

2. The nib unit according to claim 1, characterized in that: there are 2 partition members and 3 holes.

3. The nib unit according to claim 2, characterized in that: the cross-section of the rib portion is chamfered in the outer direction, the inner direction, or both the outer and inner directions.

4. The nib unit according to claim 1, characterized in that: the protruding amount of the rear end side of the rib portion from the inner side of the pen tip is smaller than the protruding amount of the front end side of the rib portion from the inner side of the pen tip.

5. The nib unit according to claim 1, characterized in that: the rear end portion of the rib portion is located at a position closer to the front end side than the rear end portion of the pen tip.

6. The nib unit according to claim 1, characterized in that: the partition member and the pen tip having the rib portion are integrally formed.

7. The nib unit according to claim 1, characterized in that: it further comprises a relay core, the outer periphery of the front end portion of the relay core is covered by the rear end portion of the nib.

8. The nib unit according to claim 1, characterized in that: the material of the nib is a polyester tapered filament or a nylon tapered filament.

9. A manufacturing method of a nib unit, which is the manufacturing method of the nib unit according to claim 1, characterized in that, Including: the step of inserting the nib into the rear end portion of the pen tip; and the step of bifurcating the pen tip of the nib along the rib portion of the pen tip and the plurality of holes in the opening portion of the front end of the pen tip.

10. The manufacturing method of the nib unit according to claim 9, characterized in that: it further includes the step of inserting the front end portion of the relay core into the rear end portion of the nib.

11. A liquid coating tool, characterized in that, Using the nib unit according to claim 1.

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