Writing instrument

Abstract

To provide a writing instrument suitable for a felt-tip pen or the like capable of suppressing wear and breakage of a pen core even when the pen core is extremely fine, and enduring long-distance writing.SOLUTION: There is provided a writing instrument A including at least a barrel 10 containing ink, a joint member 20 fixed to the tip of the barrel 10, and an ink supply core 40 that is fixed to the joint member 20 directly or by a separate member 30 and guides the ink by capillary force. The relative position between an ink supply core tip 41 that becomes the pen core and the tip of the joint member 20 at the time of writing can be changed while maintaining the amount of insertion of the rear end of the pen core 41 into the ink supply core 40.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a writing instrument suitable for a signature pen or the like.

Background Art

[0002] Conventionally, in order to prevent the pen core from breaking or being crushed due to a large writing load, writing instruments have been provided that allow the pen core under pen pressure to escape backward or bend in the direction perpendicular to the axis. For example, 1) In a writing instrument such as a thin-axis signature pen that can freely change the width of the drawn line by pen pressure, it consists of a shaft cylinder, a pen core, and a member around the core where the pen core protrudes. When the pen core retreats under pen pressure, the protrusion amount of the pen core from the member around the core during non-writing is 0.05 to 0.7 mm (for example, see Patent Document 1), 2) As a writing instrument that allows easy displacement of the pen tip by pen pressure and can prevent breakage of the pen core, it has a member around the core that can bend the pen core radially from the axis (for example, see Patent Document 2), 3) A collector-type writing instrument. In order to prevent the pen core from breaking or being crushed due to a large writing load, the pen core protrudes from the member around the core, and the protrusion amount is equal to or greater than the diameter of the pen core. It has a displacement member that can change the relative position of the member around the core and the pen core with a set load of 1 to 7 N (for example, see Patent Document 3), 4) A pen tip unit having a mouthpiece for protruding the pen core to prevent wear and breakage of the pen core for a thin-line writing instrument, a guide connected to the mouthpiece, and a spring for biasing the pen core forward, for a transparent writing instrument (for example, see Patent Document 4), etc. are known.

[0003] However, with the writing instrument disclosed in Patent Document 1 above, although it is possible to realize a sign pen that has fine drawing lines without sacrificing durability, it is not compatible with an extremely thin pen core, and it is necessary to provide an elastic part behind the member around the core. Also, there is a problem that the relative position between the pen core and the cotton core, which is an ink absorber, changes due to the retreat of the pen core. These each require creating parts with special functions that prevent the use of a sign pen when an extremely thin drawing line is needed, such as in a ballpoint pen or a sharp pen. Furthermore, conventionally, in order to supply ink smoothly from the cotton core to the pen core, a device has been devised to cut the rear end of the pen core diagonally. However, narrowing the ink flow path inside the pen core for an extremely thin drawing line and further changing the relative position between the pen core and the cotton core pose further problems that require even more attention. Furthermore, in Patent Documents 2 to 4 above, although there are various disclosures regarding sign pens having features for preventing wear and breakage of the pen core, there are problems such as the need for a member around the core for bending the pen core and a displacement member, and still the need for a member for protecting the pen core.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the problems and current situation of the above prior art, the present invention aims to solve these problems. Without increasing the number of parts and without using a spring member or the like, it is difficult for the pen core to wear, and even when using a pen core with a thin outer diameter, wear and breakage of the pen core can be suppressed, and a writing instrument suitable for a signature pen or the like that is highly durable and can withstand long-distance writing is provided.

Means for Solving the Problems

[0006] In view of the above conventional problems and the like, the present inventors have attempted to solve these problems. At least, a shaft cylinder for accommodating ink, a joint member fixed to the tip of the shaft cylinder, and an ink supply core fixed directly to the joint member or by another member and guiding ink by capillary force. A writing instrument having an ink supply core, wherein the relative position between the tip of the ink supply core serving as the pen core during writing and the tip of the joint member is configured by a displacement means having a specific structure, and the writing instrument of the above object is obtained. The present invention has been completed.

[0007] That is, the writing instrument of the present invention is at least a shaft cylinder for accommodating ink, a joint member fixed to the tip of the shaft cylinder, and an ink supply core fixed directly to the joint member or by another member and guiding ink by capillary force. A writing instrument having an ink supply core, Characterized in that the relative position between the tip of the ink supply core serving as the pen core during writing and the tip of the joint member can be changed while maintaining the amount of contact of the rear end of the pen core with the ink supply core. Preferably, it has a refill in which the ink is accommodated directly or via a cotton wick, and a refill member having the ink supply core and the joint member inside the refill is accommodated in the shaft cylinder so as to be attachable. Preferably, the pen core in a state of protruding a predetermined amount from the joint member bends radially from the axis when receiving a writing load and entering the joint member. Preferably, the pen core in a state of not protruding from the joint member advances with respect to the joint member when the joint member receiving the writing load moves backward. Preferably, the joint member is made of a member having visibility.

Advantages of the Invention

[0008] According to the present invention, even without using a spring member or the like, the pen refill is less likely to wear, and even when a pen refill with a small outer diameter is used, wear and breakage of the pen refill can be suppressed, and a writing instrument suitable for a signature pen or the like that has high durability and can withstand long-distance writing is provided. Further, in the present invention, by utilizing the elasticity of the pen refill, the above functions can be achieved without using a spring member or the like. It has a new form that is clear, delicate, and unprecedented. Each time it is written, the ink supply core having the pen refill bends (flexes), there is little vibration during writing, it is supple, soft, gentle writing feeling, extremely light writing pressure, can be written at a wide writing angle, causes little damage to the paper surface, can be used with confidence for notebooks and memo pads, and provides a writing instrument that not only has high functionality and design, but is easy to use, and highly balances sufficient durability and writing distance even with an extremely thin pen refill. Furthermore, if the joint member is made of a member having visibility, each time writing is performed, the state in which the pen refill or the like bends (flexes) can be visually recognized through the joint member. Therefore, the bending of the pen refill or the like each time it is written and its movement can be seen, which is enjoyable, and it is visually novel, resulting in a new visual writing instrument. Also, in the present invention, for refill compatibility, it can be mounted and used on shafts of various sizes and thicknesses, and a writing instrument suitable for a signature pen or the like that is fine in writing, highly durable, and comfortable to use is provided. The object and advantages of the present invention are recognized and obtained by using the components and combinations particularly pointed out in the claims. Both the above general description and the following detailed description are exemplary and explanatory, and do not limit the present invention described in the claims.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, note that the technical scope of the present invention is not limited to each of the embodiments detailed below, and extends to the invention described in the claims and its equivalents. In each figure, "front" with respect to the writing instruments A and B and their components indicates the direction of the tips of the writing instruments A and B, "rear" indicates the opposite direction, "axial direction" indicates the direction of the axis passing through from the front to the rear of the barrel 10, and "transverse direction" indicates the direction orthogonal to the axial direction. Also, reference numerals common to each drawing represent the same configuration or member, even if not particularly mentioned in the description of each drawing.

[0011] (First Embodiment: Overall Configuration) Figs. 1 to 7 are drawings related to the writing instrument A of the first embodiment of the present invention. As shown in Figs. 1 and 2, the writing instrument A of the present embodiment includes a barrel 10 and a tail plug 15 screwed into the opening 11 at the rear end of the barrel 10. The tip side of the barrel 10 is a reduced-diameter portion 12, and the tip side of the refill 20 housed inside the barrel 10 is exposed from the opening 13 on the tip side. As the material of the barrel 10, for example, it is formed of a thermoplastic resin such as metal, polyacetal resin, polyethylene resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, or a thermosetting resin. In the present embodiment, it is made of polypropylene.

[0012] (Refill) As shown in Figs. 1(b), (c) and 2, the refill 20 includes an ink supply core 30 whose tip side is a pen core 31, a joint member 40 that houses the ink supply core 30, and a tube 50 fitted to the joint member 40. Inside the joint member 40, a fixture 60 for fixing the joint member 40 and the ink supply core 30 is housed. Also, inside the tube 50, a middle cotton 55 serving as an ink absorber for absorbing ink is housed. This refill 20 is detachably mounted inside the barrel 10.

[0013] (Ink Supply Core, Pen Core) As shown in FIGS. 3(a) to 3(c), the ink supply core 30 has a cylindrical outer shape and is formed by, for example, extrusion molding of a resin material such as polyacetal. The tip side thereof becomes the pen core 31. Inside, there is a hole 32 that serves as an ink flow path having capillary force. The outer diameter (φ) of the ink supply core 30 varies depending on the use of the writing instrument, the line width to be drawn, etc., but is 0.2 to 2 mm, and is 0.4 mm in this embodiment. As will be described later, when the ink supply core 30 is immersed in the load-receiving member 40, it bends in the radial direction from the axis, so it has elasticity (flexibility), and moreover, it has the strength to support its elasticity.

[0014] Also, as shown in FIG. 1(c), when not writing, the pen core 31 at the tip of the ink supply core 30 protrudes from the tip of the joint member 40, and the rear side thereof is housed in the joint member 40 and the shaft cylinder 10. The rear side of the ink supply core 30 is caulked and fixed to the fixture 60. The distance X from the tip of the pen core 31 to the caulking position depends on the thickness of the ink supply core 30 and the inner diameter of the member 44, but in the case of this embodiment, as shown in FIG. 1(c), from the viewpoint of the amount of deflection and strength, it is preferably 5 to 60 mm, and is 25 mm in this embodiment.

[0015] The rear end portion 33 of the ink supply core 30 caulked by the fixture 60 protrudes from the fixture 50 and is stuck into the middle cotton 55. As a result, the ink stored in the middle cotton 55 is efficiently supplied to the pen core 31 by capillary force from the rear end portion 33. Although the rear side of the ink supply core 30 is caulked to the fixture 60, it does not block the ink flow path 32 and does not hinder the supply of the above ink. The amount (length) Y of the ink supply core 30's rear end portion 33 sticking into the middle cotton 46 is preferably 1 to 10 mm, more preferably 2 to 6 mm, from the viewpoint of reliable ink guidance, as shown in FIG. 1(c), and is 4.5 mm in this embodiment. Also, as shown in Fig. 1(c), the protruding amount (length) Z of the pen refill 31 from the tip of the joint member 40 is preferably 0.05 to 0.7 mm when not writing, from the viewpoints of writing performance and durability, and is set to 0.5 mm in this embodiment. At this time, the writing pressure required to completely immerse the pen refill 31 into the joint member 40 was about 2 N when this writing instrument was stood perpendicular to the paper surface.

[0016] (Joint member) As shown in Figs. 4(a) to (c), the joint member 40 includes a cylindrical rear body 41 having a fitting portion 42a on the inner peripheral surface where the fixture 60 is fitted on the rear side, and a flange portion 43 is formed on the outer periphery of the front side of the rear body 41. The front side is a continuous cylindrical body that is sequentially reduced in diameter to form a first reduced-diameter portion 44, a second reduced-diameter portion 45, and a third reduced-diameter portion 46. A tube 50 is fitted on the outer periphery of the rear body 41 of the joint member 40 by press-fitting. A fixture 60 is press-fitted into a cylindrical interior 42 having a fitting portion 42a on the inner peripheral surface inside the rear body 41. The front of the rear body 41 is sequentially reduced in diameter as described above. For example, by setting the outer diameter of the first reduced-diameter portion 44 to 2.3 mm, this refill 20 can be mounted on a ballpoint pen shaft and used. Inside the joint member 40, reduced-diameter through holes 44a, 45a, 46a that are continuous from the cylindrical interior 42 are formed. The tip side of the third reduced-diameter portion 46 is a tapered portion 47 with a reduced-diameter through hole 47a inside and a protruding hole 48 from which the pen refill 31 protrudes. Also, air introduction grooves 49 are formed in the longitudinal direction on the rear body 41 and the flange portion 43.

[0017] Also, it is desirable that the inner diameter of the first reduced-diameter portion 44 of the joint member 40 is at least twice the outer diameter of the pen refill 31. Thereby, when the pen refill 31 receives writing pressure, it bends in a direction perpendicular to the axis of the pen refill 31, and the tip of the pen refill 31 can be immersed from the joint member 40. The pen refill 31 protrudes from this tip. The entire joint member 40 configured as described above is made of, for example, a material with visibility, specifically, glass, resin without rubber elasticity, etc. As the resin without rubber elasticity that can be made visible, for example, materials with a visible light transmittance of 50% or more such as PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylons such as 6-nylon and 12-nylon), acrylic, polymethylpentene, polystyrene, and ABS are formed by molding, so that the ink supply core 30 installed inside can be made visible. The visible light transmittance can be obtained by measuring the reflectance with a multi-light source spectrophotometer [manufactured by Suga Test Instruments Co., Ltd., (MSC-5N)].

[0018] (Tube) As shown in FIGS. 1(b), (c) and FIG. 2, the tube 50 is formed in a cylindrical shape and houses a wadding 55 that stores ink inside. A joint member 40 is attached to the tip, and a tail plug 70 is attached to the rear end by press-fitting. In this embodiment, a resin tube is used, but it can be thinned by replacing it with a metal tube, and more ink can be stored in the wadding 55 housed inside.

[0019] (Wadding) As shown in FIGS. 1(b) and (c), the wadding 55 serving as an ink storage body is made of, for example, a cylindrical polyester fiber material that stores ink and is housed inside the tube 50. This wadding 55 is impregnated with a writing instrument ink composition such as aqueous ink, oil-based ink, or thermochromic ink. In addition to the above polyester fiber material, for example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, etc. It is made by processing a fiber bundle such as a fiber bundle composed of one or a combination of two or more of these, felt, etc., and also includes a porous body such as sponge, resin particles, and sintered body. The composition of the ink composition for writing instruments to be impregnated into the middle cotton 55 is not particularly limited, and can be made into a suitable formulation such as aqueous ink, oil-based ink, thermochromic ink, etc. according to the uses of writing instruments (such as signature pens, thermochromic writing instruments, etc.). Also, thermochromic microcapsule pigments and the like can be contained respectively.

[0020] (Fastener) As shown in FIGS. 1(b), (c) and FIGS. 5(a)-(c), the fastener 60 has a fitting portion 61a on the outer peripheral surface of the front side and is formed into a cylindrical cylindrical body 61. The ink supply core 30 is inserted into the insertion hole 62 at the center inside. This ink supply core 30 is configured to protrude both in front of and behind the fastener 60. Also, the diameter of the insertion hole 62 is reduced near the central part. After fixing the ink supply core 30 by pressing this part inward to form caulking parts 63, 63 (clamping parts 63a, 63a), it is press-fitted into the inside of the joint member 40. Also, the rear side of the fastener 60 is a flange body 64, and when press-fitting into the joint member 40, it is press-fitted until this touches the rear end surface 41b of the joint member 40.

[0021] (Tail plug) The tail plug 70, which is configured to close the rear end of the tube 50, is formed in a cylindrical shape, has a thick rear side and a gradually thinner outer diameter on the front side, and the front side is configured to be press-fitted into the tube 50.

[0022] In the writing instrument A configured as described above, as shown in FIGS. 1(b), (c) and FIGS. 6(a), (b), at least, it includes a shaft cylinder 10 that houses ink, a joint member 40 fixed to the tip of the shaft cylinder 10, and an ink supply core 30 that is fixed to the joint member 40 by a fixture 60 that is a separate member and guides the ink by capillary force. The relative position (Z) between the tip of the ink supply core 30, which becomes the pen core 31 during writing, and the tip of the joint member 40 can be changed while maintaining the amount (Y) of penetration of the rear end portion 33 of the ink supply core 30 at the rear end of the pen core 31 into the wadding 55. When receiving a writing pressure, it moves backward at the tip of the joint member 40, and by setting the protruding dimension from the tip of the joint member 40 within a predetermined range Z during non-writing, even without using a spring member or the like, the pen core is less likely to wear, and even when using a pen core with a thin outer diameter, wear and breakage of the pen core can be suppressed, and a writing instrument suitable for a signature pen or the like that is highly durable and can withstand long-distance writing can be obtained.

[0023] In the writing instrument of the present invention, with the above configuration, the tip portion of the ink supply core 30 is fixed to the fixture 60 in a state of protruding from the joint member 40. As shown in FIGS. 6(a), (b), by utilizing the elasticity of the ink supply core 30, when receiving a writing pressure, it bends in a direction perpendicular to the shaft, and by moving backward at the tip of the joint member 40, the above function can be achieved without using a spring member or the like. It has a clear and delicate new form, the pen core bends every time it is written, there is little vibration during writing, it is flexible, soft, has a gentle writing feel, an extremely light writing pressure, can be written at a wide writing angle, causes little damage to the paper surface, can be used with confidence in notebooks and notebooks, and provides a writing instrument that not only has high functionality and design, but is also easy to use, and can highly balance sufficient durability and writing distance even with an extremely thin pen core.

[0024] Further, in the present invention, as shown in FIGS. 1(b), (c) and FIG. 2, it can be mounted and used on shafts of various sizes and thicknesses for refill compatibility, and a writing instrument that can write small characters with high durability and can be reused can be obtained. Also, if a refill having the same dimensions as that for a ballpoint pen, which is matched to a shaft cylinder or the like for a general ballpoint pen, is used, the sign pen type of the present invention can be easily changed without replacing the shaft cylinder.

[0025] Furthermore, if the joint member 40 is made of a member having visibility, as shown in FIG. 7, the state in which the ink supply core 30 having the pen core 31 bends each time writing is performed can be visually recognized through the joint member 40. Therefore, each time writing is performed, the pen core and the like make a cracking sound and its movement can be seen, which is enjoyable, visually novel, and a new visual writing instrument can be obtained.

[0026] (Second Embodiment: Overall Configuration) FIGS. 8 to 11 are drawings showing a writing instrument B according to a second embodiment of the present invention. The writing instrument B according to the second embodiment of the present invention has a configuration in which the ink supply core 30 is directly fixed to the joint member without using the fixture 60 which is a separate member used in the writing instrument A according to the first embodiment, and integrally includes the like, so that it has the same operational effects as the writing instrument A according to the first embodiment. The shaft cylinder 10, the shaft end plug 15, the middle wick 46, the tube 50, and the end plug 70 having the same configuration as that of the writing instrument A according to the first embodiment are denoted by the same reference numerals and their description is omitted.

[0027] (Ink Supply Core, Pen Core) The ink supply core 35 has a cylindrical outer shape, as in the first embodiment, and is formed by extrusion molding of a resin material such as polyacetal. A hole is formed inside to serve as an ink flow path. The outer diameter (φ) is 0.2 to 3 mm, and is set to 1.15 mm in this embodiment. When not writing, the pen core 36 at the tip is recessed into the tip side of the joint member 80 and is not exposed, and the rear is crimped and fixed to the fixing part 86, as described below. The rear end protrudes from the fixing part 86 and is stuck in the padding 55. The amount (Y') of the rear part 38 of the ink supply core 35 stuck into the padding 55 is 1 to 10 mm, and is set to 4 mm in this embodiment. When not writing, the amount (Z') of the pen core 36 buried from the tip of the joint member 80 is 0 to 0.7 mm.

[0028] (Joint material) As shown in FIGS. 10(a) to 10(c), a coupling member 80 of this embodiment has, from the front side to the rear side, a front body 80A, a central body 80B, and a rear body 80C that are integral with each other. The coupling member 80 of this embodiment is different from the coupling member 40 shown in FIG. 4 of the above-described first embodiment in the configuration of the central body 80B (the first reduced diameter portion 44 and the second reduced diameter portion 43 in FIG. 4). The configurations of the front body 80A and the rear body 80C are the same as those of the coupling member 40 shown in FIG. 4 of the above-described first embodiment and function in the same manner. Therefore, the reference symbols shown in FIG. 4 will be used and their description will be omitted.

[0029] The joint member 80 of this embodiment includes an elastic portion 81 and a fixing portion 86 provided on a central body 80B. As shown in Figures 10(a) to (c), the elastic portion 81 is formed as a double spiral spring 82 on the front side, and the rear side is a cylindrical portion 83. The cross section of this spiral spring 82 is triangular as shown in Figure 9(c). 10(c), a through-hole 85 is formed inside the spiral spring 82, which is continuous with the through-hole 84 of the cylindrical portion 83 and has the same inner diameter as the through-hole 84, which is continuous with the inside 42 of the rear body 41, through-hole 84, through-holes 83, 46a, 47a, and the protrusion hole 48, and the ink supply core 30 is inserted through the through-hole inside. The spiral spring 82 is an example of the shape of the elastic portion 81. In the above-mentioned through hole 84, fixing portions 86, 86 (clamping portions 86a, 86a) in the form of caulking portions for fixing the ink supply core 30 inserted on the upper and lower surfaces are provided, and thus the ink supply core 30 is fixed. Other than this, the ink supply core 30 is not fixed.

[0030] The spiral spring 82 as the elastic portion 81 is formed with a predetermined spring constant corresponding to a fine-point pen or a marking pen, and an urging force that allows the ink supply core 35 to move in the axial direction described later is applied to the ink supply core 35. Note that the shape of the spiral spring 82 constituting the elastic portion 81 is not limited to this, and it may have a square cross-section.

[0031] Regarding the ink supply core 35 being movable rearward by the writing pressure at the tip of the joint member 80 in the writing instrument B based on the joint member 80 configured as described above, this will be described with reference to FIGS. 8(b), (c), 11(a) and (b). The writing instrument B in this embodiment has an ink supply core 35 and a joint member 80, and the ink supply core 35 is configured to move rearward at the tip of the joint member 80 by the writing pressure. By setting the outer diameter of the front third reduced-diameter portion 46 to 2.3 mm to 2.5 mm, it becomes possible to mount and use this refill 20 on the shaft for a ballpoint pen. The elastic portion 81 is provided on the front side of the fixing portion 86 formed by the caulking portion. As a result, when the tip of the joint member 80 receives the writing pressure, it contracts in the axial direction, and the tip of the pen core 35 can be relatively projected from the tip of the joint member 80 and can be used for writing.

[0032] In addition to the features of the first embodiment described above, in the writing instrument B of the present embodiment, when not in use, the ink supply core 35 is not exposed from the joint member 80, and the joint member 80 has an elastic portion 81. When receiving writing pressure, the elastic portion 81 shrinks in the axial direction, so that the ink supply core 35 relatively moves forward at the tip of the joint member 80 and can be used for writing with the pen core 36. The pen core 36 is difficult to wear, and even when a pen core with a small outer diameter that is difficult to wear is used, wear and breakage of the pen core can be suppressed, and a writing instrument suitable for a signature pen that can withstand long-distance writing is provided. Further, in the present embodiment, for refilling, it can also be mounted and used on shafts of various sizes and thicknesses, and a writing instrument suitable for a fine-line, highly durable, and comfortable signature pen is provided.

[0033] The writing instrument of the present invention is not limited to the writing instruments A and B of the respective embodiments disclosed in FIGS. 1 to 7 and FIGS. 8 to 11 above, and can be further variously modified without changing the technical idea of the present invention. In the writing instruments of the above respective embodiments, an ink supply core 30 with a pen core 31 at the tip side, a joint member 40 that houses the ink supply core 31, and a tube 50 fitted to the joint member 40 are provided. Inside the joint member 40, the joint member 40 and the ink supply core 30 are directly or fixed with a separate member. Inside the tube 50, a refillable configuration is adopted in which a middle cotton 46 serving as an ink absorber for holding ink is housed. However, without providing a refillable configuration and without providing the tube 50, the middle cotton 46 can be directly housed in the shaft cylinder 10, and the relative positions of the tip of the ink supply core 31, which becomes the pen core during writing, and the tip of the joint member 40 can be changed while maintaining the amount of contact of the rear end of the pen core 31 with the ink supply core 30 to achieve the same operational effects.

[0034] Also, in the above respective embodiments, the ink for the writing instrument (aqueous ink, oil-based ink, thermochromic ink) is described, but it may also be a liquid such as liquid cosmetics, liquid medicine, coating liquid, correction liquid, etc. Furthermore, in each of the above embodiments, the ink supply cores 30 and 35 having internal ink flow paths are used. However, those having flow paths outside the ink supply cores, or those having flow paths both inside and outside the ink supply cores such as fiber bundle cores and polyethylene sintered cores may also be used. Furthermore, in each of the above embodiments, the method using batting in the ink storage mechanism has been described. However, a direct liquid type not using batting may also be used.

Example

[0035] Next, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples and the like.

[0036] (Example 1: Writing instrument based on FIGS. 1 to 7) A writing instrument based on FIGS. 1 to 7 was manufactured using a barrel 10, a refill 20, an ink supply core 30, a pen core 31, a joint member 40, a tube 50, batting 55, a fixture 60, etc. having the following configurations. Also, writing instrument ink having the following composition was used.

[0037] (Configuration of writing instrument) Barrel 10: Made of polypropylene, length 120 mm, inner diameter 7 mm at the central part; outer diameter 10 mm Axial tail plug 15: Made of polypropylene Refill 20: Ink supply core 30, pen core 31: Made of polyacetal, size: φ0.4×30 mm Joint member 40: Made of polypropylene, size: φ6×30 mm Tube 50: Made of polypropylene, size: φ6×90 mm Batting 55: Made of polyester, porosity 85%, size: φ4×80 mm Fixture 60: Made of polypropylene, size: φ4×6 mm Tail plug 70: Made of polypropylene, size: φ6×6.5 mm X: 20 mm, Y: 4.5 mm, Z: 0.5 mm

[0038] (Writing instrument ink composition, ink color: black) As the ink for writing instruments, an ink having the following composition (total 100% by mass) was used. Activator: Mega Fac F410 (fluorine-based anionic surfactant, perfluoroalkyl group-containing carboxylate, manufactured by DIC Corporation) 1% by mass Mildew preventive: Benzisothiazolin-3-one 0.2% by mass Aqueous glyceryl glucoside solution: αGG (high-concentration α-glyceryl glucoside aqueous solution, 60% aqueous solution of α-glyceryl glucoside, manufactured by JTS Co., Ltd.) 3% by mass Pigment dispersion: FUJI SP BLACK 8041 (black pigment dispersion, solid content 20%, manufactured by Fuji Pigment Co., Ltd.) 20% by mass Water-soluble organic solvent: Glycerin 5% by mass Water-soluble organic solvent: Ethylene glycol 5% by mass Water (solvent): Ion-exchanged water 65.8% by mass Viscosity (25°C): 3.6 mPa·s (complete type viscometer, manufactured by TOKIMEC, TV-20) Surface tension (25°C): 40 mN / m (automatic surface tensiometer, manufactured by Kyowa Interface Science Co., Ltd., DY-300)

[0039] (Example 2: Writing instrument based on FIGS. 8 to 11) A writing instrument based on FIGS. 8 to 11 was produced using a barrel 10, a refill 20, an ink supply core 30, a pen core 31, a joint member 40, a tube 50, a middle cotton 55, a fixture 60, etc. having the following configurations. Also, the ink for writing instruments having the above composition was used.

[0040] (Configuration of the writing instrument) Barrel 10: Made of polypropylene, length 120 mm, inner diameter of the central part 7 mm; outer diameter 10 mm Axial tail plug 15: Made of polypropylene Refill 20: Ink supply core 35, pen core 36: Made of polyacetal, size: φ1.15×30 mm Joint member 80: Made of polypropylene, size: φ6×30 mm Tube 50: Made of polypropylene, size: φ6×90 mm Medium cotton 55: Made of polyester, porosity 90%, size: φ4×80 mm Tail stopper 70: Made of polypropylene, size: φ6×6.5 mm X′: 20 mm, Y′: 5 mm, Z′: 0.1 mm

[0041] When writing using each writing instrument A and B obtained in the above Examples 1 and 2, it was confirmed that a writing instrument suitable for a signature pen or the like that can suppress wear and breakage of the pen core and withstand long-distance writing can be obtained even with an extremely thin pen core. Also, in Example 1, since the joint member 40 is composed of a visible member, the state of the ink supply core 30 having the pen core 31 bending each time writing is performed can be visually recognized through the joint member, and each time writing is performed, the pen core etc. bends and its movement can also be seen, and it was confirmed that it is visually novel and becomes a new visual writing instrument.

Industrial Applicability

[0042] A writing instrument suitable for a signature pen or the like can be obtained.

Explanation of Reference Numerals

[0043] A Writing instrument 10 Shaft cylinder 30 Ink supply core 31 Pen core 40 Joint member 50 Tube 55 Medium cotton (ink absorber) 60 Fixture

Claims

Claim 1 A writing instrument comprising at least a shaft cylinder for containing ink, a joint member fixed to the tip of the shaft cylinder, and an ink supply core having a cylindrical outer shape with a diameter of 0.2 to 2 mm that is fixed directly to the joint member or by another member and guides ink by capillary force, while maintaining the amount of penetration of the rear end of the ink supply core, which becomes the pen tip during writing, into the wadding, the relative position between the tip of the ink supply core that becomes the pen tip and the tip of the joint member can be changed, and the ink supply core is fixed to the rear side of the ink supply core by a caulking portion that presses inward on the joint member. A writing instrument characterized by that.

Images