JP6808472B2 - Writing implements - Google Patents

Description

The present invention relates to a writing instrument.

In writing instruments such as so-called felt-tip pens and marker pens, which write with an ink supply core made of a material having capillary force such as a fiber bundle, the writing tip is bent by the writing pressure (Patent Document 1). Attempts have been made to change the thickness and touch of drawn lines by relatively immersing the writing tip (Patent Document 2).

JP-A-2010-194787 Japanese Unexamined Patent Publication No. 2016-26930

An object of the present invention is to facilitate the displacement of the writing tip portion due to the writing pressure and to prevent the ink supply core from being broken.

(1) First Aspect The writing instrument 1 according to the first aspect of the present invention includes a barrel 10 having an opening at the tip and
An ink accommodating portion 13 provided in the rear portion inside the barrel 10 and
It is provided with an ink supply core 50 which is housed inside the shaft cylinder 10 and can guide the ink stored in the ink storage part 13 toward the tip by capillary force.
In the writing instrument 1 in which the tip portion of the ink supply core 50 is projected from the opening of the barrel 10.
The ink supply core 50 penetrates between the opening of the shaft cylinder 10 and the ink supply core 50, and the ink supply core 50 can be bent in the radial direction from the axis. It is characterized in that the member 20 is interposed.

The core peripheral member 20 is formed of an elastically deformable material such as a thermosetting rubber such as silicone rubber, butyl rubber, or nitrile rubber, or a viscoelastic object exemplified by a thermoplastic elastomer such as styrene-based, polyester-based, or olefin-based. Has been done. When the core peripheral member 20 is elastically deformed by the writing pressure applied to the ink supply core 50, a displacement that bends in the radial direction is applied to the ink supply core 50 accordingly. If the ink supply core 50 can be bent in the radial direction, the core peripheral member 20 is displaced so as to bend in another direction, for example, in the axial direction, so that the ink supply core 50 is immersed in the barrel 10. May be possible. Further, the core peripheral member may be integrally formed with the leading shaft 11 by two-color molding or the like.

(2) Second Aspect In the writing instrument 1 according to the second aspect of the present invention, in addition to the features of the first aspect, the core peripheral member 20 has an elasticity of a durometer A hardness of 40 ° or more specified in JIS K6253. It is characterized in that it is made of a material.
Since the core peripheral member 20 is formed of rubber having such hardness, the ink supply core 50 does not easily bend too much even with an excessive writing pressure, and an appropriate bending according to an appropriate writing pressure is obtained. It will be possible to bring.

(3) Third Aspect In the writing instrument 1 according to the third aspect of the present invention, in addition to the features of the first or second aspect, the ink supply core 50 is formed of a fiber bundle and is said to be the same. The mandrel 52 penetrates the axis of the ink supply core 50.
The fiber bundle is reinforced by such a mandrel 52, and the possibility of breakage due to bending due to writing pressure can be reduced.

(4) Fourth Aspect In the writing instrument 1 according to the fourth aspect of the present invention, in addition to the features of the first or second aspect, the ink supply core 50 is formed of an extruded synthetic resin product. At least on the outer periphery thereof, there is a gap 55 in which a capillary force is generated.
As described above, the ink supply core 50 can be formed in the same manner as the fiber bundle even by the extruded product of the synthetic resin having the gap 55 such that the capillary force is generated on the outer periphery. It should be noted that such a gap 55 may be provided not only on the outer circumference but also on the inside of the ink supply core 50.

(5) Fifth Aspect The writing instrument 1 according to the fifth aspect of the present invention holds the rear portion of the ink supply core 50 in addition to the features of the first, second, third or fourth aspect. The ink supply core 50 is further provided with a displacement member 30 capable of bending the ink supply core 50 in the radial direction behind the core peripheral member 20 by pressing the ink supply core 50.
By further providing such a displacement member 30, it is possible to bend the ink supply core 50 at two points, and it is possible to disperse the bending stress as compared with the case where the ink supply core 50 is bent at only one place, and there is a possibility of breakage. Reduce. If the ink supply core 50 can be bent in the radial direction, such a displacement member 30 bends in another direction, for example, in the axial direction, so that the ink supply core 50 is immersed in the barrel 10. Such displacement may be possible.

(6) Sixth Aspect In the writing instrument 1 according to the sixth aspect of the present invention, in addition to the features of the fifth aspect, the displacement member 30 includes a holding member 35 for holding the ink supply core 50 and the holding member 35. It is characterized by having an elastic member 33 which is less rigid than the member 35 and can be elastically deformed.
In this way, the holding member 35 is responsible for holding the ink supply core 50, which requires more rigidity, and the elastic member 33, which has lower rigidity, is responsible for elastic deformation, thereby holding and elasticizing the ink supply core 50. The contradictory functions of deformation can be compatible.

It is desirable that the displacement member 30 is a two-color molded product made of different materials for the holding member 35 and the elastic member 33. For example, by primary molding the holding member 35 with a material having higher rigidity and secondary molding the elastic member 33 with a material having lower rigidity, a displacement member 30 having both the above-mentioned contradictory functions is formed. be able to.

Since the present invention is configured as described above, it is possible to facilitate the displacement of the writing tip portion due to the writing pressure and to prevent the ink supply core from being broken.

It is a front view (A) and a front sectional view (B) of the writing instrument which concerns on embodiment of this invention. It is an enlarged front sectional view of the tip part of the writing instrument shown in FIG. It is a perspective view (A), a front view (B), and a front sectional view (C) of a displacement member. It is a front perspective view (A), a front view (B), a rear perspective view (C), a bottom view (D), a side view (E), a plan view (F), and a side sectional view (G) of the core peripheral member. .. It is an enlarged side sectional view of the tip part of the writing instrument shown in FIG. It is a front view (A) and the front sectional view (B) of the 1st example of an ink supply core. It is a front view (A) and the front sectional view (B) of the 2nd example of an ink supply core. 3 is a front view (A), a bottom view (B), and a front sectional view (C) of a third example of the ink supply core. It is a front view (A), a bottom view (B), and a front sectional view (C) of the 4th example of an ink supply core. The displacement of the ink supply core at the time of writing is shown in the front sectional view.

Hereinafter, a felt-tip pen or a marking pen will be described as an example of the writing tool 1 according to the embodiment of the present invention with reference to the drawings. In the present invention, the "front" or "tip" of the writing instrument 1 and its components indicates the direction in which the writing portion is provided, and the "rear" or "rear end" indicates the direction opposite to it. And.

(overall structure)
As shown in FIG. 1A, the writing instrument 1 according to the embodiment of the present invention includes a shaft cylinder 10 having a front shaft 11 and a rear shaft 12, and a core peripheral member 20 mounted on the tip side of the front shaft 11. The appearance is provided with an ink supply core 50 protruding from the tip of the core peripheral member 20.

(Structure of shaft cylinder 10)
As shown in FIG. 1B, the axle cylinder 10 includes an ink accommodating portion 13, a front shaft 11, and a rear shaft 12.
The ink accommodating portion 13 has a tubular shape with the rear end closed and the tip open.
The tip shaft 11 has a tapered shape at the tip and a tubular shape with both ends open. The tip of the ink accommodating portion 13 is fitted in the inner circumference of the rear end of the front shaft 11.
The rear shaft 12 has a tubular shape with the rear end closed and the tip open, and houses the ink storage portion 13 and the rear end side of the front shaft 11.

A flange-shaped flange portion 15 projecting outward is provided on the outer periphery of the front shaft 11 at a position near the rear end from the middle. The outer diameter of the flange portion 15 is almost the same as the outer diameter of the rear axle 12. The front shaft 11 is divided into a rear side front shaft rear portion 14 having a substantially cylindrical shape and a front shaft front portion 16 having a tapered shape with the flange portion 15 as a boundary. The tip of the rear shaft 12 comes into contact with the rear end side of the flange portion 15.

As shown in FIG. 2, at the tip of the internal space of the front shaft front portion 16, the inner diameter of the first reduced-diameter hole 18 is reduced by the step portion, and the inner diameter is further reduced by the step portion again on the tip side thereof. A second reduced diameter hole 19 is formed. The tip of the displacement member 30, which will be described later, reaches the rear end portion of the first reduced diameter hole 18. A core peripheral member 20 is mounted in the second reduced diameter hole 19. A grip member 17 is formed by two-color molding on the outer periphery of the front shaft front portion 16 in the vicinity of the tip end to prevent slipping (see also FIGS. 1A and 1B).

(Internal structure of leading shaft 11)
As shown in FIG. 1 (B), a collector 40 made of ABS resin is press-fitted into the front shaft front portion 16. In the collector 40, a plurality of plate-shaped members are arranged in parallel along the axial direction, and ink (not shown) can be held between the plate-shaped members. Further, a collector core 41 formed of a fiber bundle is pierced at the axis of the collector 40. The rear end of the collector core 41 reaches the inside of the ink accommodating portion 13. Further, a displacement member 30 is mounted in front of the collector 40. The displacement member 30 serves as a joint that connects the collector 40 and the ink supply core 50.

(Overall structure of displacement member 30)
As shown in FIG. 3, the displacement member 30 includes a substantially tubular central member 31, a substantially tubular peripheral member 32, and an elastic member 33 connecting the central member 31 and the peripheral member 32.
The tip edge of the peripheral member 32 is located behind the middle of the central member 31, and the rear edge of the peripheral member 32 is located in front of the rear end of the central member 31. Between the outer circumference of the rear portion of the central member 31 and the inner circumference of the peripheral member 32, there is a gap 34 corresponding to the thickness of the tip of the collector 40.
Further, the elastic member 33 covers from the vicinity of the tip of the peripheral member 32 to the vicinity of the tip of the central member 31.

(Center member 31)
Inside the center member 31, the collector core 41 is inserted from the rear, and the ink supply core 50 is inserted from the front (see FIG. 1 (B)).

(Peripheral member 32)
The peripheral member 32 serves as a holding member 35 for holding the ink supply core 50 in the collector 40 together with the central member 31 by fitting the tip of the collector 40 into the above-mentioned gap 34 between the central member 31 and the center member 31. Have.

(Elastic member 33)
The elastic member 33 covers from the tip portion of the peripheral member 32 to the vicinity of the tip end of the central member 31. At a position slightly behind the middle of the elastic member 33 and in front of the tip of the peripheral member 32, the outer diameter is reduced as if it were accordion-like, and this portion becomes the connecting portion 36. ing.

(Two-color molding)
The displacement member 30 is a part formed by two-color molding. The central member 31 and the peripheral member 32 are formed by primary molding with a synthetic resin having relatively high rigidity, and the central member 31 and the peripheral member 32 are elastic members. 33 is integrally molded by secondary molding. The elastic member 33 is formed of an elastic resin material having a lower rigidity than the primary molded synthetic resin in order to give flexibility at the connecting portion 36.
Further, as the elastic resin material, a thermoplastic elastomer is desirable because it is carried out at a high temperature by using a mold in the molding process. The material of the central member 31 and the peripheral member 32, which are the primary molded bodies, is preferably a hard resin such as PBT resin.

(Core peripheral member 20)
As shown in FIGS. 2 and 4, the core peripheral member 20 has a substantially cylindrical fitting portion 21 fitted into the second diameter-reduced hole 19 and a second diameter-reduced hole located in front of the fitting portion 21. It has a substantially conical exposed portion 22 that is exposed toward the tip side from 19 and the outer diameter is gradually reduced toward the tip. The ink supply core 50 penetrates the axis of the exposed portion 22. The boundary between the fitting portion 21 and the exposed portion 22 forms a step portion 23 with the exposed portion 22 having an enlarged diameter, and the tip of the leading shaft 11 is in contact with the step portion 23.

The core peripheral member 20 is made of nitrile rubber having a durometer A hardness in the range of 40 ° to 80 °, preferably 60 °, as defined in JIS K6253. The core peripheral member 20 may be integrally molded by a multicolor molding method such as two-color molding using different materials for the fitting portion 21 and the exposed portion 22. In that case, it is preferable that the exposed portion 22 is made of a material having viscoelasticity and has a structure that is easily deformed by a writing load.
The exposed portion 22 further includes a truncated cone-shaped tapered portion 24 located on the rear side and a concave curved surface portion 25 located on the front side.
Further, two portions of the side surface of the core peripheral member 20 facing each other with the axial center interposed therebetween are formed as ventilation surfaces 26 which are cut off in a plane from the tapered portion 24 to the fitting portion 21. In a state where the fitting portion 21 is fitted into the second reduced diameter hole 19 of the leading shaft 11, a vent 29 is formed between the ventilation surface 26 and the second reduced diameter hole 19 (see FIG. 5). From this vent 29, external air enters the inside of the barrel 10 and reaches the inside of the ink accommodating portion 13 through the collector 40 to compensate for the volume of ink reduced by writing.

Further, as shown in FIGS. 2 and 4, a through hole is formed in the core peripheral member 20 from the rear end to the tip. Specifically, the rear through hole 27 having a larger inner diameter is from the rear end to the vicinity of the boundary between the tapered portion 24 and the concave surface portion 25, and the front through hole 28 has a smaller diameter from there to the tip. The ink supply core 50 passes through the rear through hole 27 and penetrates while being in contact with the front through hole 28.

(Ink supply core 50)
The first example of the ink supply core 50 shown in FIG. 6 is a fiber core formed of a fiber bundle or a porous material such as a ceramic sintered core. In the case of a fiber core, capillary force is generated in the gap between the fibers. In the case of a sintered core, innumerable micropores form a gap 55 (not shown) that generates capillary force. Both ends of the ink supply core 50 are polished into the same substantially hemispherical shape, but the one located on the tip side is the core tip 53, which is the writing tip. On the other hand, the one located on the rear end side is the core rear end 54, and this portion is fixed in a state of being in contact with the tip of the collector core 41 inside the central member 31.

The second example of the ink supply core 50 shown in FIG. 7 is a writing core having a two-layer structure. That is, the axis of the rod-shaped core 51, which is a fiber bundle such as polyester or a porous material such as polyethylene, is more than the mandrel 52, which is a resin rod made of polyacetal or polyester for reinforcement, that is, the core 51. It has a structure in which a material with high compressive strength penetrates. Although the mandrel 52 itself does not have a fine gap 55 (not shown) like the core body 51, the mandrel 52 is perpendicular to the paper surface due to the capillary force between the mandrel 52 and the writing surface. Writing is possible even when standing upright. Further, if the mandrel 52 has a higher compressive strength than the core body 51, a ceramic or metal porous body may be used for the core body 51.

The tip of the ink supply core 50 is a core tip 53 polished into a substantially hemispherical shape, and this is the writing tip. Since the core tip 53 is reinforced by the mandrel 52, the writing tip is less likely to be crushed. In the case of this example, the rear end of the ink supply core 50 has a reduced outer diameter and is formed as a core rear end 54 having a sharp shape toward the rear end. This portion is inside the central member 31. It may be fixed in a state of being stuck in the tip of the collector core 41.

A third example of the ink supply core 50 shown in FIG. 8 is a writing core in which a fine gap 55 is formed on the outside by extrusion molding or injection molding. For example, it is possible to form a fine gap 55 on the outer periphery by a die of an extrusion molding machine having a fine mesh structure, and to guide ink to the tip of an ink supply core 50 by a capillary phenomenon.

A fourth example of the ink supply core 50 shown in FIG. 9 is a writing core in which fine gaps 55 are formed on the outside and inside by extrusion molding or injection molding. By forming a fine gap 55 on the inside, it is possible to write without rubbing when writing vertically and quickly due to the capillary phenomenon.

(Characteristics of writing instrument 1)
When a writing load is applied to the core tip 53 of the ink supply core 50 at an angle not perpendicular to the paper surface, a force in the radial direction from the axial center is applied to the ink supply core 50. At this time, since the core peripheral member 20 is made of a material having a hardness that allows it to easily bend, the core peripheral member 20 bends in that direction.
On the other hand, the displacement member 30 is composed of three members as described above, and as a characteristic thereof, the peripheral member 32 and the central member 31 are the same primary molded body, but they are not continuous as the primary molded body. The displacement member 30 has a structure in which the displacement member 30 is easily bent due to the deformation of the vicinity of the connecting portion 36 of the elastic member 33.

Therefore, as shown in FIG. 10, it is possible to bend the displacement member 30 at the same time as the core peripheral member 20 bends. As a result, the ink supply core 50 can be bent at two points, and the bending stress can be dispersed as compared with the case where the ink supply core 50 is bent at only one place, and the possibility of breakage is reduced. Further, by bending the displacement member 30 in the axial direction, the relative positional relationship between the ink supply core 50 and the core peripheral member 20 is also displaced, and the ink supply core 50 can be displaced to the immersion position. ..

As described above, when the ink supply core 50 is displaced in the radial direction from the axis, the contact area of the ink supply core 50 with the paper surface increases, and the ink diffuses between the contact areas due to the capillary phenomenon. To do. As a result, it is possible to draw a line with a wider width than when writing with only the tip of the ink supply core 50 in contact with the writing surface.
In addition, when the elastic action of the displacement member 30 is used, the ink supply core 50 is in a protruding position from the immersion position when the writing load is weakened because the writing portion is separated from the writing surface due to an operation such as "tome" or "harai". Since it continuously moves forward toward, the writing width can be continuously and smoothly changed from a thick line to a narrow line.

The present invention can be used for writing instruments such as marker pens and felt-tip pens.

1 Writing implements
10 Axle cylinder 11 Front shaft 12 Rear shaft
13 Ink storage 14 Front axle rear 15 collar
16 Front shaft front 17 Grip member 18 First diameter reduction hole
19 Second reduced diameter hole
20 Core peripheral member 21 Fitting part 22 Exposed part
23 Steps 24 Tapered 25 Concave
26 Ventilation surface 27 Rear through hole 28 Front through hole
29 vents
30 Displacement member 31 Central member 32 Peripheral member
33 Elastic member 34 Void 35 Holding member
36 Connection
40 collector 41 collector core
50 Ink supply core 51 Core body 52 Mandrel
53 Core tip 54 Core rear end 55 Gap

Claims (1)

A barrel with an opening at the tip and
An ink accommodating portion provided in the rear portion inside the axle cylinder,
It is provided with an ink supply core which is housed inside the shaft cylinder and can guide the ink stored in the ink storage part toward the tip by capillary force.
In a writing instrument in which the tip end portion of the ink supply core is projected from the opening of the barrel.
Between the opening of the shaft cylinder and the ink supply core, a core peripheral member capable of penetrating the ink supply core and bending the ink supply core in the radial direction from the axis is interposed. ,
A writing instrument characterized in that the core peripheral member is made of an elastic material having a durometer A hardness of 40 ° or more specified in JIS K6253 .