JPH1128891A - Cap for writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sedimentation or deposition of pigment in ink at a nib by providing a member having no directional property to be stably inserted into a cap therein, and protecting the nib. SOLUTION: The cap 1 comprises an inner cap 2 engaged within the cap 1, and a ball 19 inserted into a bottom of the cap 2. The cap 2 engaged within the cap 1 is brought into contact with a tip barrel when the cap 1 is mounted at a writing instrument body 5 to maintain sealability within the cap 1. The ball 19 is brought into contact with an end of a pen core 14 to protect a nib. In this case, it is slightly deformed, but it is normally spherical. The ball 19 is formed of water absorbing rubber or water absorbing porous resin constituted by an open cell foam. A circumferential protrusion 21 is provided in the cap 2 so that the inserted ball 19 may not externally project.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument cap, and more particularly to a writing instrument cap for protecting a pen tip and preventing sedimentation and drying of pigment particles at the pen tip.

[0002]

2. Description of the Related Art Conventional pigment-based water-based writing instruments (sign pens).
In the case of, as shown in FIG. 2, felts a and a ′ having water absorbency are inserted into caps b and b ′, and when these caps are capped, pen felts c and c ′ are attached to these felts a and a ′. Cover the polished tip. Therefore, when sedimentation or deposition of the pigment particles of the ink occurs, the pigment particles are sedimented or deposited not on the pen tip but on the felts a and a ′, and the ink droplets and eyes formed when the pen tip is stored downward are stored. It prevents clogging, suppresses density differences inside the pen tip, and prevents drying out, extending the life of the writing implement. In addition, a felt made of a material capable of absorbing the ink is used for an oil-based writing instrument.

[0003]

However, when a felt is used as the water-absorbing member, the raw material is generally procured by stamping, but when the diameter is small, the difference between the thickness and the outer diameter is reduced, and the felt is reduced. When inserting into the cap, there is a problem that the alignment may not be performed correctly, the orientation may not be aligned, and the insertion may be unstable, and the effect may not be sufficiently exhibited.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and includes a non-directional member capable of being stably inserted into a cap inside to protect a pen tip, It is an object of the present invention to provide a writing instrument cap that prevents sedimentation and accumulation of pigment in ink at a pen tip.

[0005]

According to the first aspect of the present invention,
A sedimentation / sedimentation prevention member which is made of an open-cell body and prevents sedimentation / sedimentation of pigment particles at the nib while protecting the nib by contacting the tip part of the pen core protruding from the writing instrument shaft. A writing instrument cap provided inside, wherein the settling / sedimentation preventing member is made of non-directional water-absorbing rubber.

According to a second aspect of the present invention, there is provided a writing instrument cap according to the first aspect, wherein the settling / sedimentation preventing member is made of a water-absorbing porous resin body. The invention according to claim 3 is the writing instrument cap according to claim 1 or 2, wherein the settling / accumulation preventing member is provided integrally with the cap.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial sectional side view of a writing implement provided with a writing implement cap according to one embodiment of the present invention. The writing implement main body 5 is made of synthetic resin, and the fine character side is an inner cylinder 8, a pen core 14 through which ink 18 impregnated in a batting 15 contained in the inner cylinder 8 flows out by capillary action, and a pen core 14. And a front shaft 6 for fixing the pen core 14 to the inner cylinder 8 via the mouth plug 13. Similarly, on the extra-fine side, the writing instrument body 5 directly supports the pen core 11 and the pen core 11 through which the ink 17 impregnated in the batting 15 accommodated in the inner cylinder 9 flows out by capillary action. It is basically composed of a pipe 12, a mouth plug 10 for holding the pipe 12, and a front shaft 7 for fixing the pen core 11 to the inner cylinder 9 via the mouth plug 10.

On the fine character side, the writing instrument main body 5 is arranged in the order of the pen core 14, the mouth plug 13 and the tip shaft 6 from the tip with the cap 1 removed, and the pen tip 14, the mouth plug 13 and the tip shaft are arranged. Reference numeral 6 is arranged in the writing implement main body 5 so as to be in contact with the same axis. Similarly, on the extra-fine side, with the cap 3 removed, the writing implement main body 5 is arranged in the order of the pen core 11, the pipe 12, the mouth plug 10, and the tip shaft 7 from the tip, and the pen core 11, the pipe 12, and the mouth The plastic 10 and the tip shaft 7 are arranged in the writing instrument main body 5 so as to be in contact with each other on the same axis.

[0009] Pen cores 14 and 11 on the fine character side and the extra fine side
Is made of a material commonly used as a pen point, such as a fiber material, a felt material, or a foamed resin, and has a pointed bullet shape at the tip. The pen core 11 on the extra fine side is supported by being inserted into the pipe 12 because its diameter is very small. In addition, the pen cores 11 and 14 are
When the pen cores 11, 14 are held by the mouth plugs 10, 13, the pen cores 11, 1
The front and rear ends of the plugs 4 project from the mouth plugs 10 and 13, and the rear ends of the pen cores 11 and 14 pierce the battings 15 and 16 housed in the inner cylinders 8 and 9, respectively.
The dimensions of the pen cores 11 and 14 with respect to 3 are determined.

The cap 1 on the narrow side is basically composed of an inner cap 2 fitted in the cap 1 and a ball 19 inserted into the bottom of the inner cap 2. Cap 1
The inner cap 2 fitted into the cap abuts on the tip shaft 6 when the cap 1 is attached to the writing instrument main body 5, and maintains the hermeticity inside the cap 1. Ball 19
Is in contact with the tip of the pen core 14 to protect the pen tip. At this time, the pen tip slightly deforms, but is usually spherical. A circumferential projection 21 is provided inside the inner cap 2 so that the inserted ball 19 does not jump out.

Similarly, the cap 3 on the extra-fine side
It is basically composed of an inner cap 4 fitted therein and a ball 20 inserted into the bottom of the inner cap 4. When the cap 3 is attached to the writing instrument main body 5, the inner cap 4 fitted in the cap 3 comes into contact with the tip shaft 7 to maintain the sealing property inside the cap 3. The ball 20 is in contact with the tip of the pen core 11 to protect the pen tip. At this time, the ball 20 is slightly deformed, but is usually spherical. A circular projection 22 is provided inside the inner cap 4 so that the inserted ball 20 does not jump out.

The balls 19 and 20 are made of a water-absorbing rubber or a water-absorbing porous resin made of open cells.
These balls 19 and 20 are not punched out of a felt material, but are increased in the number of pieces. To be exact, a ball-shaped molded product in which, for example, 400 sagittal-shaped molded products are formed at a time is made of a water-absorbing rubber. Alternatively, it can be obtained by procuring as a molded product using a water-absorbing porous resin body. As a molding method, as a general method, balls are procured by introducing a deburring process of a saturn-shaped burr portion after separating the entire body into one body after molding. The ball 1 made of the water-absorbing rubber or the water-absorbing porous resin body thus obtained
The writing implement body 5 is provided with the caps 1 and 3 having the insides 9 and 20 therein.
When sedimentation, the sedimentation and deposition of the pigment particles in the inks 17 and 18 do not occur at the tips of the pen cores 11 and 14, and the balls 19 and 20 in contact with the tips of the pen cores 11 and 14 due to the capillary phenomenon. Since sedimentation and deposition occur, the long life of the pen cores 11 and 14 can be expected.

Thus, sedimentation of pigment particles at the pen tip,
By using a ball made of a water-absorbing rubber or a ball made of a water-absorbing porous resin body composed of open cells as a member for preventing the deposition, the workability of insertion into the cap in the process is greatly improved. Further, since the ball is a molded product, it is possible to incorporate a density gradient unlike the case of felt, and a tapered inner cap can be employed as shown in FIG. Furthermore, since it is possible to procure in the same shape, quality is improved.

When it is difficult to procure a ball-shaped rubber or resin body, it is possible to use a method in which a rod-shaped original rod is used and cut into a required length during assembly and inserted into the cap. is there. Although it is inferior to the above-mentioned ball-shaped rubber in the step of inserting into the cap, it can be said that the supply direction is improved because the alignment direction is determined in the alignment step.

The water-absorbing rubber used for the ball-shaped rubber is
Specifically, it is prepared by mixing KI gel 201K-F2 (manufactured by Kuraray Co., Ltd.) with general silicone rubber or chloroprene rubber at about 30 to 60% by weight and molding. In setting the rubber hardness, the practically moldable range is 10 to 50 °, and the optimum hardness is about 20 °, which is about the same as urethane rubber.

The water-absorbing porous resin body used for the ball-shaped resin body is excellent in chemical resistance, mechanical strength and workability, and has a continuous pore structure having water absorbing and water retaining properties. Although not particularly limited, specifically,
A porous resin body (PVA sponge) having continuous pores made of PVA (polyvinyl alcohol) is used. The hardness of the water-absorbent porous resin body is preferably in the same range as that of the water-absorbent rubber. PVA sponge is
The porous substrate PVF is formed by a formalization reaction in which formaldehyde is bound to water-soluble PVA using an acid as a catalyst.
(Polyvinyl formal) is produced and, at that time, obtained by extracting a pore-forming agent, and the obtained porous body forms a complete three-dimensional branched network continuous structure. And elasticity when wet (flexibility, elasticity)
Is good. Also, this porous body is pure white,
In the case of dyeing, by performing it in the process of formalization reaction, it can be dyed uniformly and fast to an arbitrary color, and the pore size (0.3 to 1000 μm) can be arbitrarily adjusted according to the purpose of use. Since the secondary processing is easy, it can be easily formed into various shapes.

[0017]

According to the cap for a writing instrument according to the first or second aspect, the non-directional water-absorbing rubber or the water-absorbing porous resin body constituted by the open-cell body is brought into contact with the tip of the pen core. Since the pen tip is provided in the cap, it is possible to protect the pen tip and to prevent sedimentation / accumulation of the pigment particles in the ink at the pen tip. Further, since the water-absorbing rubber or the water-absorbing porous resin body having no directivity is correctly aligned and aligned in the direction of insertion into the cap, a stable insertion operation can be realized. Further, since the water-absorbing rubber or the water-absorbing porous resin body is constituted by the open-cell body, there is an advantage that it is not necessary to incorporate a measure for releasing air at the bottom of the cap when inserting the cap into the cap. .

According to the cap for a writing instrument of the third aspect, the member for preventing sedimentation / sedimentation is provided integrally with the cap, so that the insertion step can be omitted, and labor saving in member management can be achieved. it can.

[Brief description of the drawings]

FIG. 1 is a partial sectional side view of a writing implement provided with a writing implement cap according to an embodiment of the present invention.

FIG. 2 is a partial side sectional view of a writing instrument provided with a conventional writing instrument cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap 2 Inner cap 5 Writing instrument main body 6 Tip shaft 14 Pen core 19 Ball 21 Projection

Claims (3)

[Claims] The present invention relates to a sedimentation device which is made of open cells and prevents sedimentation and accumulation of pigment particles at a pen tip while protecting the pen tip by contacting the tip of a pen core protruding from a writing instrument shaft. What is claimed is: 1. A writing instrument cap including a deposition preventing member therein, wherein the settling / accumulating member is made of non-directional water-absorbing rubber. 2. The writing instrument cap according to claim 1, wherein the settling / sedimentation preventing member is made of a water-absorbing porous resin body. 3. The sedimentation / sedimentation prevention member is provided integrally with a cap.
A writing instrument cap as described.