JP2021154525A - Ballpoint pen refill group arranged on the same type of barrel - Google Patents

Abstract

To provide a ballpoint pen refill group which has an effect of being able to intuitively judge the ball diameter required by oneself and pick it up instantly even when the ball diameters are different in the ballpoint pen refill group arranged on the same type of barrel.SOLUTION: In a ballpoint pen refill group arranged on a barrel of the same type having the same outer diameter and the total length of a ballpoint pen refill but different ball diameters of the ballpoint pen tip of the ballpoint pen refill in which the ballpoint pen tip that rotatably holds the ball is attached to an ink storage tube directly or via a joint member, a pattern is printed on the surface of the ink storage tube, and the thickness of the pattern is changed in gradation according to the ball diameter.SELECTED DRAWING: Figure 1

Description

The present invention relates to a plurality of ballpoint pen refills arranged on a shaft cylinder of the same type.

Conventionally, a ballpoint pen refill in which ink is directly stored and a ballpoint pen tip that rotatably holds a ball is arranged at the tip of the ink storage tube directly or via a joint member is well known. Such ballpoint pen refills generally use a transparent or translucent ink storage tube, and the ink is visible from the outside.

In Patent Document 1, when ballpoint pen refills having different ball diameters are considered as a group of ballpoint pen refills that can be arranged on a barrel of the same type, if the total length and outer diameter of the ink containing tubes are different, the ballpoint pen refills are arranged on the barrel. When it is installed, there is a problem that it rattles or it becomes difficult to dispose of it in an arbitrary place. By accommodating the ink accommodating amount, the change in the distance from the rear end portion of the ink accommodating tube to the ink rear end surface is suppressed, and the difference in the ink accommodating amount in appearance due to the difference in the ball diameter is not known. A technique for providing a ballpoint pen refill group that makes it easy to set a mechanical assembly according to a change in ball diameter is disclosed.

However, it has been conceived that a transparent or translucent resin material such as polypropylene has been conventionally used for the ink storage tube of Patent Document 1 in order to ensure ease of molding and visibility of the amount of ink. In recent years, the problem of microplastics flowing into the ocean has attracted a great deal of attention. As we refrain from using plastics that are supposed to be disposable and are working on global environmental issues, we are also required to remove plastics from the members that make up writing utensils. Therefore, Patent Document 2 discloses a ballpoint pen refill using an environment-friendly ink storage tube for writing tools, which reduces the amount of plastic used by using a paper base material as the base layer of the tube material of the ink storage tube. ing.

JP 2002-59682 JP-A-2020-29037

However, since the ink storage tube of Patent Document 2 is a paper base material, the ink storage tube is opaque, and therefore, it is manufactured as a ballpoint pen refill group in which ballpoint pen refills having different ball diameters can be arranged on a barrel of the same type. In that case, when checking the ball diameter, there is no choice but to visually recognize the fine writing tip or identify only by the small written text information on the surface of the ink storage tube etc., and it is used by men and women of all ages from the ballpoint pen refill group. When selecting the desired ball diameter, it is difficult to easily identify and pick up the specified refill.

Therefore, an object of the present invention is to be able to easily select a ballpoint pen refill having a ball diameter that requires ballpoint pen refills having different ball diameters from the group.

According to the present invention, the ballpoint pen refill in which opaque writing ink is stored in an ink storage tube and a ballpoint pen tip rotatably holding a ball is attached to the front end of the ink storage tube directly or via a joint member. In a ballpoint pen refill group arranged on a barrel of the same type having the same outer diameter and the same total length but different ball diameters of the ballpoint pen tips, a pattern is printed on the surface of the ink storage tube, and the thickness of the pattern is adjusted according to the ball diameter. It is characterized by changing the gradation.
The fact that the ink storage tube is opaque includes not only that the writing ink contained in the ink can not be seen at all, but also that the internal state has low transparency and it is difficult to visually recognize the remaining amount of ink, for example. Is done.
Further, the thickness of the pattern is preferably proportional to the thickness of the writing line drawn by the ballpoint pen tip. It should be noted that the proportional relationship shown here includes not only enlargement but also equal magnification such as 2 times, 3 times, etc.

Further, the ink storage tube has at least a two-layer structure of an inner layer and a base layer in contact with the ink, the base layer is made of a paper base material, and the inner layer is made of a resin.
Further, it is preferable that the resin constituting the inner layer is an acrylic resin, polystyrene, a fluororesin, a silicone, or a combination thereof.
Further, it is preferable that the resin constituting the inner layer contains biodegradable plastic.

Further, the distance from the rear end of each ink accommodating tube to the rear end surface of the grease-like ink follower of the grease-like ink follower that follows with the consumption of ink is set to a constant distance. ..

Further, the inner diameter of each ink accommodating tube is relative to the ball diameter so that the ink accommodating amount accommodated in each ink accommodating tube of the ballpoint pen refill group has the same writing distance regardless of the difference in the ball diameter of the ballpoint pen tip. It is preferable to change to.

According to the present invention, even as a ballpoint pen refill group in which ballpoint pen refills having different ball diameters can be arranged on a barrel of the same type, the effect of being able to intuitively determine the ball diameter required by oneself and pick up the ballpoint pen refills instantly. Play.

It is external drawing in the ballpoint pen refill group with different ball diameters which concerns on 1st Embodiment of this invention. It is external drawing in the ballpoint pen refill group with different ball diameters which concerns on 2nd Embodiment of this invention. It is an external view in the ballpoint pen refill group with different ball diameters which concerns on 3rd Embodiment of this invention. It is a vertical sectional view of the refill which shows one of the ballpoint pen refill group of each embodiment of this invention. A plan view (a), a cross-sectional view taken along the line AA (b), a side view taken along the arrow BB (c), and an enlarged side view taken along the arrow BB (d) according to the embodiment. Is. A plan view (a), a cross-sectional view taken along the line AA, a side view taken along the arrow BB (c), and an enlarged side view taken along the line BB according to another embodiment (a), a cross-sectional view taken along the line AA (b), and a side view taken along the line BB d). It is a figure which shows the laminated sheet (a), the ink accommodating tube (b) which wound the laminated sheet spirally, the ink accommodating tube (c) which wound the laminated sheet flat, and the ink accommodating tube (d) which wound multiple times. It is a perspective view which shows the ballpoint pen housed in the shaft cylinder of the same kind which concerns on each embodiment. It is a front view which shows the ballpoint pen housed in the shaft cylinder of the same kind which concerns on each embodiment. It is a side view which shows the ballpoint pen housed in the shaft cylinder of the same kind which concerns on each embodiment. It is sectional drawing which shows the shaft cylinder of the ballpoint pen shown in FIG. 8 along the axial direction. It is a perspective view which shows the inner cylinder of the ballpoint pen shown in FIG. It is a front view which shows the inner cylinder of the ballpoint pen shown in FIG. It is a right side view which shows the inner cylinder of the ballpoint pen shown in FIG. It is a left side view which shows the inner cylinder of the ballpoint pen shown in FIG. FIG. 12C is a cross-sectional view taken along the line EE of FIG. 12C. FIG. 12B is a cross-sectional view taken along the line FF of FIG. 12B. FIG. 12C is a cross-sectional view taken along the line GG of FIG. 12C. It is a perspective view which shows the clip member of the writing tool shown in FIG. It is a front view which shows the clip member of the writing tool shown in FIG. It is a side view which shows the clip member of the writing tool shown in FIG. It is a front view (the 1) for demonstrating the method of attaching the clip member of the ballpoint pen accommodated in the shaft cylinder of the same kind which concerns on each embodiment. It is a side view (the 1) for demonstrating the method of attaching the clip member of the ballpoint pen accommodated in the shaft cylinder of the same kind which concerns on each embodiment. It is a front view (the 2) for demonstrating the method of attaching the clip member of the ballpoint pen accommodated in the shaft cylinder of the same kind which concerns on each embodiment. It is a side view (the 2) for demonstrating the method of attaching the clip member of the ballpoint pen accommodated in the shaft cylinder of the same kind which concerns on each embodiment. FIG. 3 is a front view (No. 3) for explaining a method of attaching a clip member of a ballpoint pen to be housed in a barrel of the same type according to each embodiment. It is a side view which shows the state which opened the clip of the ballpoint pen housed in the shaft cylinder of the same kind which concerns on each embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A common reference code is attached to the corresponding components throughout the drawings. In the present specification, in the axial direction of the ballpoint pen 1, the ballpoint pen tip 5 side is defined as the "front" side, and the side opposite to the ballpoint pen tip is defined as the "rear" side.

1 to 3 are ballpoint pens in which ink is stored inside an opaque ink storage tube 9 formed in a tubular shape and whose inside is difficult to see, and a ball is rotatably held at the front end on the front side of the ink storage tube 9. It is a refill 4 in which the tip 5 is attached via the joint member 11. The outer diameter and the total length of the refill 4 are the same, and the ballpoint pen tip 5 has a different ball diameter. The refills 4 having different ball diameters have a linear identification pattern 10 printed on the surface of the ink containing tube 9, and the thickness of each line is changed in gradation according to the ball diameter.

The first embodiment in FIG. 1 is a ballpoint pen refill group arranged on a shaft cylinder of the same type when an identification pattern 10 which is a spiral line is printed on an ink storage tube 9 made of a paper base material. FIG. 1A shows a ballpoint pen refill 4a in the case of a ballpoint pen tip 5a having a ball diameter of 0.3 mm, FIG. 1B shows a ballpoint pen refill 4b in the case of a ballpoint pen tip 5b having a ball diameter of 0.4 mm, and FIG. 1C shows a ballpoint pen refill 4b. The ballpoint pen refill 4c in the case of a ballpoint pen tip 5c having a ball diameter of 0.5 mm, FIG. 1 (d) shows the ballpoint pen refill 4d in the case of a ballpoint pen tip 5d having a ball diameter of 0.7 mm, and the ballpoint pen tip 5a in FIG. 1 (e) has a ball diameter. The ballpoint pen refill 4e in the case of 1.0 mm is used. In the first embodiment, the line width of the identification pattern 10a written on the ballpoint pen refill 4a is 0.6 mm, the line width of the identification pattern 10b written on the ballpoint pen refill 4b is 0.8 mm, and the line width of the identification pattern 10b written on the ballpoint pen refill 4c is 0.8 mm. The line width of 10c is 1.0 mm, the line width of the identification pattern 10d written on the ballpoint pen refill 4d is 1.5 mm, and the line width of the identification pattern 10e written on the ballpoint pen refill 4e is 2.0 mm. The printing thickness of the identification pattern 10 is proportional to about three times the thickness of the writing line drawn by each ballpoint pen tip 5. A color similar to the ink color is used for coloring the identification pattern 10. By changing the thickness of the line printed as a pattern in this way, even as a ballpoint pen refill group that can be arranged on a shaft cylinder of the same type, it is easy to make a ball without checking the tip of a minute ballpoint pen tip. You can intuitively judge the difference in diameter and pick it up instantly.

It should be noted that the gradation change of the thickness of the pattern according to the ball diameter means that the thickness of the pattern and the size of the ball diameter need to be relatively changed, and the ball of the ballpoint pen tip 5 as in the first embodiment. It also includes making the line thickness of the identification pattern 10 smaller as the diameter increases. Further, the proportional relationship between the thickness of the writing line and the thickness of the pattern printed on the ink containing tube 9 does not necessarily have to be enlarged in a similar manner, and the thickness of the writing line and the identification printed on the ink containing tube 9 are identified. It also includes that the line thickness of the pattern 10 is substantially the same or reduced.

The second embodiment in FIG. 2 is an identification pattern 10 different from that of the first embodiment, and is a case where the linear identification pattern 10 is printed from the front end side to the rear end side on the ink storage tube 9 made of a paper base material. This is a group of ballpoint pen refills arranged on the same type of barrel. FIG. 2A shows a ballpoint pen refill 4a in the case of a ballpoint pen tip 5a having a ball diameter of 0.3 mm, FIG. 2B shows a ballpoint pen refill 4b in the case of a ballpoint pen tip 5b having a ball diameter of 0.4 mm, and FIG. 2C shows a ballpoint pen refill 4b. The ballpoint pen refill 4c in the case of a ballpoint pen tip 5c having a ball diameter of 0.5 mm, FIG. 2 (d) shows the ballpoint pen refill 4d in the case of a ballpoint pen tip 5d having a ball diameter of 0.7 mm, and the ballpoint pen tip 5a in FIG. 2 (e) has a ball diameter. The ballpoint pen refill 4e in the case of 1.0 mm is used. Further, the print area of the identification pattern 10 does not need to be colored from the front end to the rear end of the ink storage tube 9, and may be within a range that can be easily visually identified. When the identification pattern 10 is a line, the thickness of the line of the identification pattern 10 is increased by focusing on easily sensuously judging the difference in ball diameter and picking it up instantly without checking the tip of a minute ballpoint pen tip. It is preferable that the thickness of the written line is doubled or more.

The third embodiment in FIG. 3 is an identification pattern 10 different from the first embodiment and the second embodiment, and is a plurality of circumferential lines on the outer diameter of the ink storage tube 9 made of a paper base material. This is a group of ballpoint pen refills arranged on a barrel of the same type when the identification pattern 10 is printed. FIG. 3A shows a ballpoint pen refill 4a in the case of a ballpoint pen tip 5a having a ball diameter of 0.3 mm, FIG. 3B shows a ballpoint pen refill 4b in the case of a ballpoint pen tip 5b having a ball diameter of 0.4 mm, and FIG. 3C shows a ballpoint pen refill 4b. The ballpoint pen refill 4c in the case of a ballpoint pen tip 5c having a ball diameter of 0.5 mm, FIG. 3 (d) shows the ballpoint pen refill 4d in the case of a ballpoint pen tip 5d having a ball diameter of 0.7 mm, and the ballpoint pen tip 5a in FIG. 3 (e) has a ball diameter. The ballpoint pen refill 4e in the case of 1.0 mm is used. The pitch of the circumferential lines is printed to be constant regardless of the diameter of each ball, and the ball diameter, that is, the thickness of the writing line is increased, and the line thickness of the identification pattern 10 of the ink storage tube 9 is increased. , The non-printed part is narrowed. Further, the print area of the identification pattern 10 does not need to be colored from the front end to the rear end of the ink storage tube 9, and may be within a range that can be easily visually identified.

FIG. 4 is a vertical cross-sectional view of the refill 4 according to one of the refill groups of the embodiment. The refill 4 has a tubular ink storage tube 9, a ballpoint pen tip 5 that is a writing portion, and a joint member 11 that connects the ink storage tube 9 and the ballpoint pen tip 5. The ink storage tube 9 is configured to store the ink 13. The rear end of the joint member 11 is press-fitted into the front end of the ink storage tube 9. Further, the rear end portion of the ballpoint pen tip 5 is mounted in the front end portion of the joint member 11. The ballpoint pen tip 5 serving as a writing unit holds a ball at its tip, and the ink contained in the ink accommodating tube 9 portion is ejected through the joint member 17 in accordance with the rotation of the ball during writing. A sphere formed of a corrosion-resistant material may be housed inside the joint member 11 and provided with an ink backflow prevention mechanism.

The joint member 11 is made of a synthetic resin material such as polypropylene, or an opaque material such as biodegradable plastic that reduces the environmental load and is difficult to see inside, or a fiber kneaded by adding a polymer binder and water. It is preferable to use a fibrous molded product in which the main material is filled in the cavity of a heated mold, and the added water is vaporized and removed to solidify.

When fibrous molded products are used, the main fibrous materials are paper waste, used paper, cotton cloth, linen, paddy husks, tofu husks, natural fibrous materials such as wood flour, glass fibers, and nylon and polyacrylic. , Any fiber made of synthetic resin such as polyester can be used, but paper fiber such as paper waste and used paper is particularly preferable. Since the fiber length of such paper fibers is short, in the case of a molded product that requires strength, it is effective to combine 5% to 40% of other fibers, and the length of the composited fibers is It is preferably 3 mm to 10 mm.

As the above-mentioned polymer binder, when kneaded with the fibrous main material, a water-soluble or low-viscosity emulsion is formed, and when water is vaporized and removed, it is a solid molded product. Water-soluble polymer materials such as starch, polyvinyl alcohol, polyacrylic acid, polyacrylamide, polyitaconic acid, carboxymethyl cellulose, and copolymers thereof can be used, and urea resin, Even thermosetting resins that are not originally water-soluble, such as melamine resins, phenol resins, and unsaturated polyesters, can be used in which the initial condensate is an aqueous solution or an emulsion. In this case, in the mold that has been heated to a high temperature, the added water becomes insoluble due to the curing reaction after vaporization and dehydration, so that the molded product can be easily released from the mold. Further, in the case of a water-soluble polymer material, it is water-soluble even after water is vaporized and removed to solidify, so that the thermosetting resin is preferable in the case of a molded product that requires water resistance. The blending ratio of the polymer binder is preferably 10% to 50% of the fibrous main material at the time of solidification. When the blending ratio is 50% or more, the amount of the fibrous main material is insufficient, while when it is less than 10%, it is difficult to uniformly knead with the fibrous main material, and the strength of the molded product is also lowered, which is not preferable.

The ink storage tube 9 of the refill 4 will be described. As shown in FIG. 5, the ink containing tube 9 in the embodiment has at least a two-layer structure of an inner layer 8 and a base layer 7 in contact with the ink, the base layer 7 is made of a paper base material, and the inner layer 8 is formed of a paper base material. It is composed of resin. The inner layer 8 of the ink storage tube 9 is a layer that comes into contact with the ink. The resin constituting the inner layer 8 is not limited as long as it is easy to process and does not dissolve in the ink for writing tools, that is, it does not penetrate to the base layer 7. Examples of the resin include polyethylene, polypropylene, fluororesin, polyvinyl chloride, polystyrene, silicone, acrylonitrile-butadiene-styrene resin (ABS resin), acrylonitrile styrene resin (AS resin), and acrylic resin (including emulsion form). Wax-based emulsion alone, wax-based emulsion alone and a mixture of synthetic rubber-based latex, acrylic emulsion and wax-based emulsion mixture, polylactic acid, poly (3-hydroxybutyrate-co-hydroxyhexanoate), polyglycol Examples thereof include acid, polybutylene succinate, polybutylene succinate adipate, and biodegradable plastics such as polybutylene adipate terephthalate and polyethylene terephthalate succinate. Of these, acrylic resins, polystyrenes, fluororesins, silicones, or a combination thereof and biodegradable plastics are preferable in terms of excellent workability and strength, handling and availability. The biodegradable plastic is suitable as an environment-friendly material as long as it can impart the strength and life required for the ink storage tube.

As a method for forming the inner layer 8, for example, a method of laminating a resin film by extrusion lamination or the like, a method of coating a liquid resin, or the like can be appropriately selected. When the inner layer 8 is formed by coating, the coating amount is 5 to 30 g / m ² , preferably 10 to 20 g / m ² . When the resin film is bonded, the thickness of the inner layer 8 is usually 3 to 90 μm.

As the paper base material constituting the base layer 7, a single-layer or multi-layered paper base material used for liquid storage can be used. The paper base material used in the embodiment is preferably excellent in bending resistance, drop impact absorption, water resistance of the end face, etc. due to molding of the ink containing tube 9. From this point of view, it can be said that the multilayer paper base material in which high-density paper is laminated on both sides of the low-density paperboard is excellent in the function that the low-density layer absorbs bending stress and the impact of dropping. Specifically, a base paper for a carton having a basis weight of 50 to 500 g / m ^{2 or} the like is preferably used. The thickness of the base layer 7 is 20 to 2000 μm. The base layer may be composed of one sheet of paper, or two or more sheets of paper may be superposed.

As shown in FIG. 6, the ink containing tube 9 of the embodiment may have a three-layer structure of an inner layer 8, a base layer 7, and an outer layer 6. The outer layer 6 is an outer layer of the ink containing tube 9, and is a layer that covers the base layer 7. The resin constituting the outer layer 6 may be a resin that is easy to process and does not dissolve in either water-based or oil-based ink, that is, one that does not penetrate to the intermediate layer 5, like the resin constituting the inner layer 8. Furthermore, those that do not absorb the moisture in the outside air are preferable.
Examples of the resin constituting the outer layer 6 include the same resin as the material constituting the inner layer 8. The resin constituting the inner layer 8 and the resin constituting the outer layer 6 may be the same or different. The thickness of the outer layer 6 is 3 to 90 μm.

A preferred embodiment of the ink containing tube 9 of the embodiment is to apply a polymer compound such as an acrylic resin, polystyrene, a fluororesin, a silicone, or a combination thereof and a biodegradable plastic such as polylactic acid on the front and back surfaces of a paper base material. It is also bonded to give moisture resistance, water resistance, and oil resistance.

The ink storage tube 9 may have at least a two-layer structure of an inner layer 8 and a base layer 7 (FIG. 5b), and may have, for example, a three-layer to five-layer structure. Another embodiment is an ink containing tube having a three-layer structure of an inner layer 8, a base layer 7, and an outer layer 6, as shown in FIG. 6b, or between the inner layer 4 and the base layer 7, or between the base layer 7 and the outer layer 6. A layer such as an ultraviolet absorbing film, an aluminum vapor-deposited film, or a colored film may be provided between the two.

Such a laminated sheet having at least a two-layer structure of the inner layer 8 and the base layer 7 is formed by applying or affixing resin for the inner layer and the outer layer on the front surface and the back surface of the paper base material. The ink containing tube 9 of the embodiment is formed by rolling a laminated sheet having at least a two-layer structure of the inner layer 8 and the base layer 7 described above into a cylindrical shape using a spiral machine or the like. To form a cylinder is to use a plurality of laminated sheets cut to a desired winding width, for example, 2 to 4 sheets, and wind them around a core rod to form a cylindrical shape. As shown in FIG. 7, the method of winding is a method of spirally winding a laminated sheet (FIG. 7 (a)) around a core rod (spiral winding: FIG. 7 (b)), and winding the laminated sheet around the core rod. Either a method of winding at a right angle (flat winding: FIG. 7 (c)) or a method of multiple winding of laminated sheets (multiple winding: FIG. 7 (d)) may be used, and from the viewpoint of strength, spiral winding or multiple winding may be used. Is preferable. Further, as shown in FIG. 7A, by coloring the end portion of the laminated sheet or the like in advance with the identification pattern 10, it is possible to facilitate the formation of the identification pattern 10 of each embodiment on the ink storage tube 9. ..

Alternatively, as another manufacturing method, the paper base sheet, which is the intermediate layer 5, is cut to a desired winding width, then spirally wound or flatly wound into a tubular shape, and the cylindrical base layer 7 is immersed in a molten resin and pulled up. , The inner layer 8 and the outer layer 6 may be formed by drying. However, in this case, the inner layer 8 and the outer layer 6 may be formed of the same resin, and adjustment may be required to make the laminated sheet uniform in thickness.

The dimensions of the ink storage tube 9 are dimensions used for ordinary writing tools and are not particularly limited, but are generally 1.5 to 6 mm in inner diameter, 1.8 to 10 mm in outer diameter, and 30 to 150 mm in length. Is within the range of.

The ink storage tube 9 in the embodiment can be applied not only as the material used as the paper base material but also as an opaque material such as biodegradable plastic in which the amount of ink is difficult to visually recognize.

The ink 13 contained in the ink storage tube 9 is an aqueous ink composition containing a polyoxyethylene alkyl ether, a water-soluble organic solvent, a colorant, and water. In particular, it is preferable that the polyoxyethylene alkyl ether has an HLB value of 12 to 15, and the polyoxyethylene alkyl ether has an alkyl group having 8 to 12 carbon atoms. By using the above-mentioned ink, it is possible to achieve both dryness and bleeding, which are contradictory characteristics.

The polyoxyethylene alkyl ether is a compound in which a polyoxyethylene chain and an alkyl group are ether-bonded. Specific examples of the polyoxyethylene alkyl ether include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene behenyl ether, and polyoxyethylene decyltetradecyl ether. And so on. The polyoxyethylene alkyl ether preferably has an alkyl group having 8 to 12 carbon atoms. When the ink contains polyoxyethylene alkyl ether, it is possible to enhance the permeability of the ink to paper. When the alkyl group of the polyoxyethylene alkyl ether has 8 or more carbon atoms, it is possible to reduce the bleeding of drawn lines. When the number of carbon atoms of the alkyl group of the polyoxyethylene alkyl ether is 12 or less, it is possible to enhance the permeability of the ink to paper. From the same viewpoint, the alkyl group preferably has 8 to 10 carbon atoms. Further, the alkyl group is preferably in the form of a branched chain. Examples of such an alkyl group include an isodecyl group and an ethylhexyl group. The HLB (Hydrophile-Lipophile Balance) value of polyoxyethylene alkyl ether is 12 to 15. When the HLB value is 12 or more, the dissolution stability of the polyoxyethylene alkyl ether in the ink is increased, and it is possible to suppress the bleeding of drawn lines. When the HLB value is 15 or less, it is possible to enhance the permeability of the ink to the paper surface. The content of polyoxyethylene alkyl ether is preferably 0.1 to 10% by mass based on the total amount of ink. When the content of the polyoxyethylene alkyl ether is 0.1% by mass or more, the permeability of the ink to the paper tends to be enhanced. Further, when the content of the polyoxyethylene alkyl ether is 10% by mass or less, excellent dissolution stability tends to be obtained while maintaining the permeability.

Water-soluble organic solvents include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, ethylene glycol monomethyl ether, glycerin, pyrrolidone, urea, thiourea, ethylene urea, sorbit, mannit, sucrose, glucose, and reduction. Examples thereof include ethylene hydrolysate and sodium pyrophosphate. The content of the water-soluble organic solvent is preferably 1 to 30% by mass based on the total amount of the ink.

Colorants include dyes and pigments. The dye is preferably a water-soluble dye, for example, a direct dye, an acid dye, a basic dye, or the like. The pigment is preferably a water-dispersible pigment, for example, an organic pigment, an inorganic pigment, or the like. The colorant may be used alone or in combination of two or more. Examples of the direct dye include Color Index (hereinafter referred to as CI) Direct Black 17, 19, 38, 154, C.I. I. Direct Yellow 1, 4, 12, 29, C.I. I. Direct Orange 6, 8, 26, 29, C.I. I. Direct Red 1, 2, 4, 4, 13, C.I. I. Direct Blue 2, 6, 15, 15, 78, 87 and the like can be mentioned. Further, as an acid dye, C.I. I. Acid Black2, 31, C.I. I. Acid Yellow 3, 17, 23, 73, C.I. I. Acid Orange 10, C.I. I. Acid Red 13, 14, 18, 18, 27, 52, 73, 87, 92, C.I. I. Acid Blue 1, 9, 74, 90 and the like can be mentioned. Further, as a basic dye, C.I. I. Basic Yellow 2, same 3, C.I. I. Basic Red 1, 2, 8, 12, C.I. I. Basic Violet 1, 3, 10, 10, C.I. I. Basic Blue 5, 9, 26, etc. can be mentioned. The water-dispersible pigment is not particularly limited as long as it can be dispersed in an aqueous medium, and examples thereof include inorganic pigments such as carbon black and metal powder, organic pigments such as azo, phthalocyanine and quinacridone, and fluorescent pigments. Can be mentioned.

The ink 13 of the embodiment contains water as an aqueous solution or an aqueous dispersion of the above-mentioned components, or separately from the above-mentioned components. The water content is preferably 20 to 80% by mass based on the total amount of ink.

The ink 13 of the embodiment preferably contains a phosphoric acid ester. Since the ink contains a phosphoric acid ester, it tends to be possible to obtain excellent lubricity without impairing the drying property of the drawn line. Furthermore, by containing a specific phosphoric acid ester, there is a tendency that bleeding of drawn lines can be suppressed. The phosphoric acid ester is represented by the following formula (2).
O = P (OR ² ) _p (OH) _3-p ... (2)
In the formula, R2 represents an organic group. Examples of the organic group include an alkyl group and an aryl group. The alkyl group and aryl group may be further substituted with an alkoxy group or the like. P in the formula is an integer of 1-3. The phosphoric acid ester is preferably a polyoxyethylene alkyl ether phosphoric acid ester. The polyoxyethylene alkyl ether phosphoric acid ester is classified as a phosphoric acid ester even if it has the structure of a polyoxyethylene alkyl ether. In the case of polyoxyethylene alkyl ether phosphoric acid ester, it is represented by the following formula (3).
O = P [(OCH ₂ CH ₂ ) _q OR ³ ] _p (OH) _3-p ... (3)
In the formula, R3 represents an alkyl group having 10 or less carbon atoms. The alkyl group preferably has 1 to 10 carbon atoms, more preferably 6 to 10 carbon atoms. In the formula, p is an integer of 1 to 3, and q is appropriately selected so as to have good dissolution stability, and is, for example, an integer of 2 to 10. When the number of carbon atoms of the alkyl group of R3 of the polyoxyethylene alkyl ether phosphoric acid ester is 10 or less, bleeding tends to be suppressed without impairing the drying property of the drawn line. When the ink 13 of the embodiment contains a phosphoric acid ester, the content of the phosphoric acid ester is preferably 0.05 to 5% by mass, preferably 0.5 to 2% by mass, based on the total amount of the ink. Is more preferable. When the content of the phosphoric acid ester is 0.05% by mass or more, the lubricity tends to be improved while maintaining the dryness of the drawn lines. Further, when the content of the phosphoric acid ester is 5% by mass or less, there is a tendency that excellent dissolution stability can be obtained while maintaining lubricity.

In the ink 13 of the embodiment, in addition to the above-mentioned components, additives such as a rust preventive, a pH adjuster, a thickener, a preservative (antifungal agent), a lubricant, a dye dissolving aid, and a fixing resin are added. It may be contained.

Examples of the rust preventive include benzotriazole and its derivatives, tolyltriazole, dicyclohexylammonium nitrate, diisopropylammonylnitrite, sodium thiosulfate, ethylenediamine tetraacetate, imidazole, benzimidazole, saponin, and dialkylthiourea. The content of the rust preventive is preferably 0.3 to 5% by mass, more preferably 0.5 to 3% by mass, based on the total amount of the ink.

As the pH adjuster, inorganic salts such as sodium carbonate, sodium phosphate, sodium hydroxide and sodium acetate, and organic basic compounds such as water-soluble amine compounds such as triethanolamine and diethanolamine can be used. ..

Thickeners include natural-xanthan gum, guar gum, locust bean gum, carrageenan, arabic gum, tragacand gum, alginic acid, gelatin, agar, casein, psyllium sheet gum, tamarind sheet gum, synthetic-methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, Examples thereof include carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium alginate, polyvinylpyrrolidone, polyvinyl alcohol, polyvinyl methyl ether, sodium polyacrylate, and carboxyvinyl polymer. These can be used alone or in combination of two or more. The content of the thickener is preferably 0.1 to 3% by mass, more preferably 0.2 to 1% by mass, based on the total amount of the ink. If the content exceeds 3% by mass, the viscosity of the ink becomes too high, and the ink tends to be easily clogged with the pen tip. On the other hand, if the content is less than 0.1% by mass, the viscosity of the ink is low and ink leakage tends to occur more easily from the tip of the chip.

Preservatives (fungicides) include coal acid, sodium salt of 1,2-benzisothiazolin-3-one, sodium benzoate, sodium dehydroacetate, potassium sorbate, propyl paraoxybenzoate, and 2,3,5. 6-Tetrachloro-4- (methylsulfonyl) pyridine and the like can be mentioned. The content of the preservative is preferably 0.1 to 5% by mass, more preferably 0.1 to 1% by mass, based on the total amount of the ink.

Examples of the lubricant include higher fatty acids such as oleic acid, nonionic surfactants having long-chain alkyl groups, polyether-modified silicone oils, thioaroic acid tri (alkoxycarbonylmethyl ester) and thioarophosphate tri (alkoxycarbonylethyl ester). ) And the like, as well as metal salts, ammonium salts, amine salts, alkanolamine salts and the like thereof. The content of the lubricant is preferably 0.3 to 5% by mass, more preferably 0.5 to 3% by mass, based on the total amount of ink.

The viscosity of the ink 13 of the embodiment is preferably 500 to 3000 mPa · s at a temperature of 25 ° C. and a shear rate of 0.75 s- ^1. When the viscosity is 500 mPa · s or more, ink leakage is less likely to occur than the tip of the ballpoint pen tip, and bleeding of drawn lines tends to be reduced. Further, when the viscosity is 3000 mPa · s or less, the ink tends to have excellent permeability to the paper surface or the like.

The ink 13 of the embodiment includes a polyoxyethylene alkyl ether, a water-soluble organic solvent, a colorant and water, and if necessary, a phosphate ester or an additive, for example, a stirrer such as a dissolver, a Henschel mixer, or a homomixer. Obtained by using and mixing.

Examples of the amount of ink to be blended include 0.5 parts by mass of polyoxyethylene alkyl ether, 1.0 part by mass of phosphate ester, 30.0 parts by mass of colorant, 0.1 part by mass of rust preventive, and 0 parts by pH adjuster. .5 parts by mass, 0.5 parts by mass of thickener, 15.0 parts by mass of water-soluble organic solvent, and 52.4 parts by mass of water are mixed. Further, as the polyoxyethylene alkyl ether, Nonion EH208 (manufactured by NOF CORPORATION, polyoxyethylene-2-ethylhexyl-ether, HLB 14.6) was used. As the phosphoric acid ester, Prysurf A208F (polyoxyethylene-2-ethylhexyl-ether phosphoric acid ester manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was used. As the colorant, WATER BLACK 191-L 15% sol (manufactured by Orient Chemical Industry Co., Ltd., black dye, 15% by mass aqueous solution) was used. Triltriazole was used as the rust preventive. Triethanolamine was used as the pH adjuster. Xanthan gum was used as the thickener. Propylene glycol was used as the water-soluble organic solvent.

The rear end of the ink filled in the ink storage tube 9 is filled with a grease-like ink follower 15 for the purpose of preventing backflow and volatilization. The ink follower 15 is sufficiently good in ink followability and sufficiently causes backflow by blending at least mineral oil, polybutene, metal soap, styrene-based thermoplastic elastomer, and atactic polypropylene. It can be suppressed. In particular, the metal soap is aluminum stearate or sodium monostearate, the blending ratio of the mineral oil is 50 to 90% by mass, the blending ratio of the polybutene is 5 to 50% by mass, and the consistency at 25 ° C. Is preferably 100 to 500.

As the mineral oil, refined mineral oil or the like can be used. Its kinematic viscosity is preferably 50 to 500 mm ² / s. Here, the kinematic viscosity of the mineral oil is at 40 ° C., is measured according to the method specified in JIS K2283 (2000), and is a numerical value measured under the conditions of temperature: 40 ° C. and rotation speed: 0.5 rpm. Is. By adjusting the kinematic viscosity of the mineral oil within this numerical range, it is possible to improve ink followability and impact resistance. The mineral oil may be obtained by refining petroleum as a raw material by a conventional method, or may be a commercially available mineral oil. For example, Diana Process Oil PW-90, PW-150, PW-380, Diana Fresia P-90, P-180, P-430 (manufactured by Idemitsu Kosan Co., Ltd., trade name), Super Oil N68, M68, N460, M460. (The above is a product name manufactured by Nippon Oil Co., Ltd.), Cosmo Neutral 100, 150, 350, 500 (the above is a product name manufactured by Cosmo Oil Bricants Co., Ltd.). Mineral oils, which are distinguished by the refining method, kinematic viscosity, trade name, etc., are used alone or in combination of two or more.

The weight average molecular weight of polybutene is preferably 500 to 10,000. When the weight average molecular weight is less than the lower limit value, phase separation is likely to occur, and when it exceeds the upper limit value, the viscosity becomes high, the ink followability is lowered, and the writing line tends to be blurred. Polybutene can be synthesized by a conventional method, or commercially available polybutene may be used. For example, Idemitsu Polybutene 2000H (manufactured by Idemitsu Kosan Co., Ltd., trade name, weight average molecular weight: 2900), Idemitsu Polybutene 15H (manufactured by Idemitsu Kosan Co., Ltd., trade name, weight average molecular weight: 550), Polybutene HV-15 (manufactured by Nippon Petrochemical Co., Ltd.). , Trade name, weight average molecular weight: 540). Polybutene is used alone or in combination of two or more of those distinguished by the synthesis method, weight average molecular weight, trade name and the like.

As the metal soap, one capable of gelling a mixture of mineral oil and polybutene is preferably used. Examples thereof include higher fatty acids such as stearic acid, lauric acid, myristic acid, palmitic acid, arachidic acid, behenic acid, oleic acid, linoleic acid and linolenic acid. A fatty acid having 16 to 20 carbon atoms is preferable, and a saturated fatty acid having a carbon number within the above range is more preferable, from the viewpoint of improving ink followability. Alternatively, metals such as aluminum, magnesium, calcium, zinc, sodium, lithium and potassium can be mentioned. In that case, aluminum and lithium are preferable from the viewpoint of improving ink followability. In particular, aluminum stearate or sodium monostearate is preferable. Metal soap is usually used in a solid state when preparing an ink follower. Since aluminum stearate and aluminum monostearate have a lower melting point than aluminum distearate and aluminum tristearate, they are in a liquid state at a relatively low temperature, which adversely affects other components used in the ink follower ( It is difficult to give (excessive volatilization, carbonization, etc.). As the metal soap, one that can be synthesized by a conventional method or that is commercially available may be used. For example, aluminum stearate 300 (manufactured by NOF Corporation, trade name), aluminum stearate 103 (manufactured by Nitto Kasei Kogyo Co., Ltd., trade name), S-7000 (manufactured by Sakai Chemical Co., Ltd., trade name), etc. Included is lithium stearate. The metal soap is classified by the type of higher fatty acid, the type of metal, the coordination number of higher fatty acid with respect to the metal, etc., and one of them is used alone or in combination of two or more kinds.

It is considered that the styrene-based thermoplastic elastomer can function as a thickener for the ink follower 15. Examples of styrene-based thermoplastic elastomers include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene / butylene-styrene block copolymer (SEBS), and styrene-propylene / butylene. -Styrene block copolymer (SEPS) can be mentioned. Among these, SEBS or SEPS is preferable from the viewpoint of more reliably achieving the effect of the present invention such as improvement of ink followability. The styrene-based thermoplastic elastomer can be synthesized by a conventional method, and a commercially available product may be used. For example, Septon (manufactured by Kuraray, trade name), Tough Bren (manufactured by Asahi Kasei, trade name), Kraton Polymer (manufactured by JSR, trade name) can be mentioned. The styrene-based thermoplastic elastomer is used alone or in combination of two or more of those distinguished by the synthesis method, styrene content, weight average molecular weight, trade name, and the like.

It is considered that the atactic polypropylene can function as a thickener especially for low molecular weight components among the components contained in the ink follower 15. The weight average molecular weight of the atactic polypropylene according to the embodiment is preferably 1000 to 50,000. If the weight average molecular weight is less than the lower limit value, it tends to be difficult to obtain the desired sagging suppressing effect, and if it exceeds the upper limit value, the ink followability tends to decrease as the viscosity increases. The atactic polypropylene can be synthesized by a conventional method, and a commercially available product may be used. For example, Sun Attack (manufactured by Ciba Fine Chemicals, trade name, weight average molecular weight: 5000 to 20000), Herodine 8500 (manufactured by Hirodyne Industries, trade name, weight average molecular weight: 20000 to 30000), Bistak L (manufactured by Ciba Fine Chemicals, Product name, weight average molecular weight: 5000-10000). Of those distinguished by the synthesis method, weight average molecular weight, trade name, etc., the atactic polypropylene is used alone or in combination of two or more.

In the ink follower 15, the blending ratio of each of the above-mentioned components is not particularly limited as long as it has the effect of improving the ink followability according to the present invention. However, the blending ratio of the mineral oil to the total amount of the ink followers is preferably 50 to 90% by mass. When the blending ratio of the mineral oil exceeds the upper limit value, the ink follower tends to sag and the impact resistance tends to decrease. When the amount is lower than the lower limit value, each component of the ink follower separates. It is easy to get mixed in the ink.

The mixing ratio of polybutene with respect to the total amount of the ink follower 15 is preferably 5 to 50% by mass. When the compounding ratio of polybutene exceeds the upper limit value, each component of the ink follower is separated and easily mixed in the ink, and when it is less than the lower limit value, the impact resistance tends to decrease.

The blending ratio of the metal soap to the total amount of the ink followers is preferably 0.1 to 10.0% by mass. When the blending ratio of the metal soap exceeds the upper limit value, the viscosity of the ink follower tends to increase and the ink followability tends to decrease, and when it falls below the lower limit value, phase separation tends to occur.

The blending ratio of the styrene-based thermoplastic elastomer to the total amount of the ink followers is preferably 0.1 to 10.0% by mass. When the blending ratio of the styrene-based thermoplastic elastomer exceeds the upper limit value, the viscosity of the ink follower tends to increase and the ink followability tends to decrease, and when it falls below the lower limit value, phase separation tends to occur.

The blending ratio of the atactic polypropylene with respect to the total amount of the ink followers is preferably 0.1 to 10.0% by mass. When the blending ratio of the atactic polypropylene exceeds the upper limit value, the viscosity of the ink follower tends to increase and the ink followability tends to decrease, and when it falls below the lower limit value, phase separation tends to occur.

In the preparation example of the ink follower 15, first, mineral oil and polybutene, which are base oils, are mixed to obtain a mixture of base oils. Further, by sufficiently stirring the base oil mixture using a stirring device such as a double action stirring device, a sufficiently uniformly dissolved or dispersed base oil mixture can be obtained. Then, the metal soap is added to the mixture of the base oil, and the mixture is sufficiently stirred and mixed using a mixing device such as a double action stirring device, preferably under a temperature condition of 20 to 30 ° C. By doing so, it is possible to easily obtain an oil component in which the base oil is in the form of a gel. Subsequently, a styrene-based thermoplastic elastomer is added to the gelled oil content, and the mixture is sufficiently stirred and mixed using the mixing device, preferably under a temperature condition of 20 to 30 ° C. Then, among the above components, atactic polypropylene is added at the end, and the ink follower 15 is obtained by sufficiently stirring and mixing using the mixing device, preferably under a temperature condition of 20 to 30 ° C. The viscosity of atactic polypropylene tends to decrease significantly due to the influence of strong shearing force. Therefore, by adding the atactic polypropylene to the ink follower after the other components, the time for performing an operation such as stirring on the atactic polypropylene is shortened. As a result, the decrease in viscosity of the atactic polypropylene is further suppressed, so that the phase separation of the backflow preventive body using this ink follower is further suppressed.

In addition to the above-mentioned components, the ink follower 15 may further contain other additives such as a structure stabilizer, an antioxidant, a surface treatment agent, a colorant, a surfactant, and a thickener. However, these additives are preferably added in a type, amount and / or timing that does not inhibit the gelation of the base oil by the metal soap when preparing the ink follower.

Further, the amount of ink 13 stored in each ink storage tube of the ballpoint pen refill group is set so that the distance from the rear end portion of the ink storage tube 9 to the rear end surface of the ink 13 is a constant distance, and the ball diameter of the ballpoint pen tip 5 is set. The inner diameter of each ink storage tube 9 is set to a large diameter or a small diameter in proportion to the ball diameter so that the writable distance is the same regardless of the difference between the two inks, and the grease-like ink follower 15 that follows as the ink 13 is consumed. It is preferable that the distance from the rear end portion of the ink accommodating tube 9 of each refill to the rear end surface of the grease-like ink follower 15 is a constant distance. In that case, in order to make the inner diameter of the ink storage tube 9 large or small, it is preferable to adjust the thickness of the base layer 7 of the ink storage tube 9 and the number of windings according to the ball diameter. Since the ink consumption per unit distance according to the ball diameter is proportional to each other if the same ink 13 is used, the ink consumption amount is set to be small for the refill 4 having a small ball diameter and a small ink consumption amount. A large amount of ink 13 is stored in the refill 4 having a large number of balls and a large ball diameter. The storage capacity of the ink follower 15 is such that the distance from the rear end of the ink storage tube 9 to the rear end surface of the ink follower 15 is within a constant range regardless of the ball diameter, so that the ink storage tube including the ink follower 15 can be accommodated. In addition to facilitating control of the capacity during manufacturing, it is possible to prevent variations in refill consumption due to ball diameter due to user use. Management of the distance from the rear end of the ink accommodating tube 9 to the rear end of the ink follower 15 includes a measurement method using a sensor from the rear end of the refill 4 on the production line.

8 to 11 show a ballpoint pen 1 provided with a refill 4 of one of the ballpoint pen refill groups arranged on a barrel of the same type of the embodiment, FIG. 8 is a perspective view, and FIG. 9 is a front view and a view. 10 is a side view. Further, FIG. 11 is a cross-sectional view of the barrel of the writing instrument shown in FIG. 8 along the axial direction. The embodiment is a so-called knock-type ballpoint pen, in which the ballpoint pen tip 5 of the refill 4 protrudes from the tip opening 2a of the refill 4 by pushing the knock member 16 at the rear end, and the ballpoint pen tip 5 of the refill 4 It is possible to switch between the state of being housed in the barrel 2.

As shown in FIGS. 8 to 11, the ballpoint pen 1 of the embodiment includes a writing instrument main body 107 and a clip member 108 held on a side portion of the writing instrument main body 107. The writing tool main body 107 includes a cylindrical shaft cylinder 2, a refill 4 housed in the shaft cylinder 2, and an infestation mechanism 106 provided at the rear end of the shaft cylinder 2. The indentation mechanism 106 includes an inner cylinder 110, a rotor 12, a spring member 14 that presses the refill 4 toward the rear end side of the shaft cylinder 2, and a knock member 16 that can slide back and forth in the axial direction.

12A to 12G show the inner cylinder of the writing instrument shown in FIG. 8, FIG. 12A is a perspective view, FIG. 12B is a front view, FIG. 12C is a right side view, and FIG. 12D is a left side view. 12E is a cross-sectional view taken along the line EE of FIG. 12C, FIG. 12F is a cross-sectional view taken along the line FF of FIG. 12B, and FIG. 12G is a cross-sectional view taken along the line GG of FIG. 12C. As shown in FIGS. 12A to 12G, the inner cylinder 110 is connected to the cylindrical main body 110a, the rear end 110b connected to the rear end side of the main body 110a, and the rear end side of the main body 110a. A clip mounting portion 110c is provided. The main body portion 110a, the rear end portion 110b, and the clip mounting portion 110c are integrally molded.

The main body 110a has a substantially cylindrical shape, and the outer diameter of the main body 110a is slightly smaller than the inner diameter of the barrel 2. Further, a cam portion 110f is formed on the inner peripheral surface of the rear end portion of the main body portion 110a. The cam portion 110f cooperates with the cam portion 12b of the rotor 12 to rotate the rotor 12 by pressing the knock member 16, so that the ballpoint pen tip 5 of the refill 4 comes from the tip opening 2a of the barrel 2. It is possible to switch between the protruding state and the state of being housed in the barrel 2. As the configuration of the cam portion 110f of the inner cylinder 110 and the cam portion 12b of the rotor 12, a well-known configuration can be adopted.

The rear end portion 110b is formed in an annular shape, and its outer shape is substantially equal to the outer diameter of the barrel 2. A circular through hole penetrating in the front-rear direction is formed in the rear end portion 110b.

The clip mounting portion 110c is provided at a predetermined distance from the rear end of the main body portion 110a, and is formed in a columnar shape extending toward the side. Both side surfaces of the clip mounting portion 110c in the lateral direction (horizontal direction in FIG. 12B) are formed in parallel.

A first mounting notch 110g is formed at the rear portion of the clip mounting portion 110c. The first mounting notch 110g has a radius from the radial outer end of the rear end of the clip mounting portion 110c (above and left end of the clip mounting portion 110c in FIG. 12C) toward the front (lower side of FIG. 12C). It is composed of notches extending inward in the direction (right side in FIG. 12C) so as to incline. A columnar accommodating portion 110g1 is formed at the end of the first mounting notch 110g.

Further, a second mounting hole 110h penetrating in the lateral direction is formed in the front portion of the clip mounting portion 110c. The second mounting hole 110h has a base end portion 110h1 on the right side and a relief portion 110h2 on the left side. The base end portion 110h1 is open on the right side surface of the clip mounting portion 110c and is formed in a columnar shape. Further, the relief portion 110h2 is opened on the left side surface of the clip mounting portion 110c, and is formed in a columnar shape having a diameter larger than that of the base end portion 110h1.

The accommodating portion 110g1 of the first mounting notch 110g and the second mounting hole 110h are aligned in the longitudinal direction (that is, located equidistant from the central axis of the inner cylinder 110), and the first mounting notch 110g. Is formed behind the second mounting hole 110h.

In the assembled state, the main body 110a of the inner cylinder 110 is inserted from the rear end opening 2b of the shaft cylinder 2 and is located inside the inner cylinder 110 so that the rear end portion 110b abuts on the rear end edge of the shaft cylinder 2. Have been placed. Further, the knock member 16 is inserted into the through hole of the rear end portion 110b of the inner cylinder 110 from the front, and the protrusion 16a is located inside the main body portion 10a of the inner cylinder 10. Further, in the rotor 12, the base end portion 12a is inserted into the knock member 16 from the front, and the tip edge of the knock member 16 is in contact with the rear end surface of the cam portion 12b of the rotor 12. Further, the tip surface of the cam portion 12b of the rotor 12 is in contact with the refill 4. As a result, the rotor 12 and the knock member 16 are urged rearward via the refill 4.

By pushing the knock member 16 in such a state, the rotor 12 rotates, and the convex portion of the cam portion 12b of the rotor 12 is inserted into the concave portion of the cam portion 110f of the inner cylinder 110, and the inner cylinder 110 The state in which the tip of the convex portion of the cam portion 110f and the tip of the convex portion of the cam portion 12b of the rotor 12 are in contact with each other is switched, and the ball pen tip 5 of the refill 4 is housed in the barrel 2. It is possible to switch between the state of protruding from the tip of the barrel 2.

13A to 13C show clip members of the writing tool shown in FIG. 8, FIG. 13A is a perspective view, FIG. 13B is a front view, and FIG. 13C is a side view. 13A to 13C show a state in which the clip member is removed from the inner cylinder. As shown in FIGS. 13A to 13C, the clip member 108 is formed by bending a single metal wire such as stainless steel. The clip member 108 has a U-shaped tip 108A, a U-shaped rear end 108C, and an intermediate 108B between the tip 108A and the rear end 108C.

The tip portion 108A connects the front portion of the first vertical portion 108b, the front portion of the second vertical portion 108c, the front end of the first vertical portion 108b, and the front end of the second vertical portion 108c. It is composed of an arcuate portion 108a of the above. The first vertical portion 108b extends rearward from the end portion on the right side (right side in FIG. 13B) of the first arc-shaped portion 108a to the intermediate portion 108B. Further, the second vertical portion 108c extends rearward from the left end portion (left side of FIG. 13B) of the first arc-shaped portion 108a beyond the intermediate portion 108B to the rear end portion 108C.

The rear end portion 108C includes a rear end portion of the second vertical portion 108c and a second arc-shaped portion 108d extending in an arc shape from the rear end portion of the second vertical portion 108c to the right side (right side in FIG. 13B). It is composed of a third vertical portion 108e extending forward from an end portion on the right side (right side in FIG. 13B) of the second arc-shaped portion 108d.

The intermediate portion 108B includes a first end portion 108f extending from the front end portion of the third vertical portion 108e toward the left side (left side in FIG. 13B) and a left end portion from the rear end portion of the first vertical portion 108b (FIG. 13B). It is provided with a second end 108 g extending toward the left side). A bent portion 108h that is inclined forward toward the left is formed at the tip of the second end portion 108g.

When the clip member 108 is removed from the inner cylinder 110, the first vertical portion 108b is inclined outward in the radial direction (left side in FIG. 13C) toward the rear with respect to the direction in which the second vertical portion 108c extends. ing. Therefore, the first end portion 108f is located closer to the writing tool main body than the second end portion 108g.

In the assembled state, the accommodating portion 110g1 and the second mounting hole 110h of the first mounting notch 110g of the clip mounting portion 110c of the inner cylinder 110 are separated from the outer surface of the shaft cylinder 2 by a predetermined distance and are aligned in the longitudinal direction. It is located like. In the clip member 108, the first end 108f is inserted into the first mounting notch 110g of the clip mounting portion 110c of the inner cylinder 110, and the second end 108g is inserted into the second mounting hole 110h of the clip mounting portion 110c. It is inserted and fixed. At this time, the bent portion 108h at the tip of the second end portion 108g is located in the relief portion 110h2 of the second mounting hole 110h. The clip member 108 is attached in a state in which the first vertical portion 108b is deformed so as to be substantially parallel to the second vertical portion 108c.

As a result, the intermediate portion 108B of the clip member 108 is held by the clip mounting portion 110c. Further, as described above, since the clip member 108 is attached in a deformed state, the tip portion 108A is urged toward the writing tool main body 7 by the elastic force of the metal wire rod constituting the clip member 108. As a result, as shown in FIG. 10, with the clip member 108 attached to the inner cylinder 110, the tip portion 108A of the clip member 108 is in contact with the outer peripheral surface of the shaft cylinder 2 of the writing tool main body 107.

When attaching the clip member 108, first, as shown in FIGS. 14A and 14B, the front and back sides are reversed and the front and back sides are reversed (that is, the second end portion 108g is the first end portion). The bent portion 108h of the second end portion 108g is inserted into the base end portion 110h1 of the second mounting hole 110h, and the clip member 108 is inserted into the base end portion 110h1. The first arcuate portion 108a is rotated around the end portion 108g of the second until the first arcuate portion 108a is located on the rear end side, and the second end portion 108g is placed in the relief portion 110h2 so that the bent portion 108h is located in the relief portion 110h2. Insert it into the mounting hole 110h.

Next, as shown in FIGS. 15A and 15B, the first arcuate portion 108a is curved so that the second arcuate portion 108d side is located on the left side of the writing tool main body 107. Then, as shown by an arrow in FIG. 15B, the clip member 108 is rotated around the second end portion 108g so that the first arcuate portion 108a is located forward.

Next, as shown in FIG. 16, the third vertical portion 108e and the first end portion 108f are inserted into the first mounting notch 110g from the side, and the first end portion 108f is arranged in the accommodating portion 110g1. do. As a result, the clip member 108 can be attached to the clip attachment portion 110c. The clip member 108 after attachment in which the first end portion 108f is arranged in the accommodating portion 110g1 cannot be removed unless the clip member 108 or the inner cylinder 110 is destroyed.

FIG. 17 is a side view showing a state in which the clip of the writing tool according to the second embodiment of the present invention is opened. As shown in FIG. 17, when the rear end portion 108C of the clip member 108 is pushed inward in the radial direction toward the writing tool main body 107, the clip member 108 rotates around the intermediate portion 108B held by the clip mounting portion 110c as a fulcrum. The tip portion 108A of the sword moves outward in the radial direction so as to be separated from the writing tool main body 107. Therefore, the user of the ball pen 1 of the embodiment presses the rear end portion 108C of the clip member 108 while holding the barrel 2 of the writing tool main body 107 with the index finger, middle finger, ring finger, and little finger of one hand to clip. The clip member 108 and the writing tool main body 107 can be opened by separating the tip portion 108A of the member 108 from the writing tool main body 107.

In the embodiment according to the above configuration, the intermediate portion 108B of the clip member 108 is held by the side portion of the writing tool main body 107, and the clip member by pressing the rear end portion 108C of the clip member 108 toward the writing tool main body 107. The 108 rotates so that the tip 108A of the clip member 108 is separated from the writing tool main body 107. Therefore, the clip member 108 can be opened by pushing the rear end portion 108C of the clip member 108 while holding the axle tube 2 of the writing tool main body 107 with the index finger, middle finger, ring finger, and little finger of one hand. Can be operated.

Further, according to the embodiment, the tip portion 108A is urged toward the writing tool main body 107 by the elasticity of the wire rod constituting the clip member 108, so that the configuration is simple without using an urging member such as a spring. The clip member 108 can be configured.

Further, according to the embodiment, the second mounting hole 110h is formed by a hole extending in the lateral direction, the relief portion 110h2 is formed in the second mounting hole 110h, and the relief portion 110h2 is bent at the second end portion 108g. The unit 108h is arranged. As described above, since the bent portion 108h is formed at the second end portion 108g of the clip member 108, it is possible to prevent the clip member 108 from coming off from the second mounting hole 110h.

In the embodiment, the first mounting notch 110g is formed from the notch, and the second mounting hole 110h is formed by a hole extending in the lateral direction. However, the present invention is not limited to this, and the notch is formed in the hole extending in the lateral direction. It may be changed, or the hole extending in the lateral direction may be changed to a notch. Further, in the present embodiment, the bent portion 108h is formed at the second end portion 108g of the clip member 108, but the present invention is not limited to this, and the bent portion may be provided at the first end portion 108f.

Further, in the embodiment, the clip mounting portion 110c is provided on the inner cylinder 110 and the clip member 108 is attached to the clip mounting portion 110c. 108 may be attached.

Further, in the embodiment, in a state where the first mounting notch 110g and the second mounting hole 110h are aligned in the longitudinal direction and the clip member 108 is removed from the inner cylinder 110, the first end portion 108f is the second. The present invention is not limited to this, although it is configured to be located closer to the main body of the writing tool than the end 108 g. Even when the clip member 108 is formed flat, if the second mounting hole 110h on the brush tip side is formed closer to the writing tool body 107 than the first mounting notch 110g, the tip of the clip member 108 will be the writing tool body. It can be urged to the 107 side.

1 Ballpoint pen 2 Axle cylinder 2a Tip opening 2b Rear end opening 4 Refill 5 Ballpoint pen tip 6 Outer layer 7 Base layer 8 Inner layer 9 Ink storage tube 10 Identification pattern
11 Joint member 12 Rotor 12a Base end 12b Cam 13 Ink 14 Spring member 15 Ink follower 16 Knock member 16a Protrusion 106 Protrusion mechanism 107 Writing tool body 108 Clip member 108A Tip 108B Intermediate 108C Rear end 108a First Arc-shaped portion 108b First vertical portion 108c Second vertical portion 108d Second arc-shaped portion 108e Third vertical portion 108f First end portion 108g Second end portion 108h Bending portion 110 Inner cylinder 110a Main body portion 110b Rear end 110c Clip mounting 110f Cam 110g First mounting notch 110g1 Accommodating 110h Second mounting hole 110h1 Base end 110h2 Relief

Claims (6)

The ballpoint pen tip of a ballpoint pen refill in which ink is stored in an opaque ink storage tube and a ballpoint pen tip that rotatably holds a ball is mounted directly or via a joint member, and the outer diameter and the total length of the ballpoint pen refill are the same. In the ballpoint pen refill group arranged on the same type of barrels having different ball diameters, a pattern is printed on the surface of the ink accommodating tube, and the thickness of the pattern is changed in gradation according to the ball diameter. A group of ballpoint pen refills arranged on the same type of barrel. The ballpoint pen refill group arranged on a barrel of the same type according to claim 1, wherein the thickness of the writing line drawn by the ballpoint pen tip and the thickness of the pattern printed by the ink storage tube are in a proportional relationship. It has at least a two-layer structure consisting of an inner layer and a base layer that come into contact with ink.
The ballpoint pen refill group arranged on a shaft cylinder of the same type according to claim 1 or 2, wherein the base layer is made of a paper base material and the inner layer is made of a resin. The ballpoint pen refill group arranged on a barrel of the same type according to claim 3, wherein the resin constituting the inner layer is composed of an ink accommodating tube containing biodegradable plastic. Claims 1 to 4 in which the distance from the rear end of each ink accommodating tube to the rear end surface of the grease-like ink follower of the grease-like ink follower that follows with the consumption of the ink is set to a constant distance. A group of ballpoint pen refills arranged on a shaft cylinder of the same type according to any one of the above items. The inner diameter of each ink storage tube is changed relative to the ball diameter so that the ink storage capacity of each ink storage tube of the ballpoint pen refill group is the same as the writable distance regardless of the difference in the ball diameter of the ballpoint pen tip. A group of ballpoint pen refills arranged on a shaft cylinder of the same type according to any one of claims 1 to 5, wherein the refills are made of the same type.

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