JPH10157373A - Ball-point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ink in a tip from dropping back by improving a sealing property of a tip opening when the ball-point is not used. SOLUTION: A ball point pen 1 is composed of a tip 2, a container 3, and a cap 4. The tip 2 is provided with a tip opening 21 discharging ink and sucking air in writing, and a ball under a non-frontward energized state is rotatably supported therein. The container 3 is equipped with the tip at its tip, and pigment ink 9 is stored inside the container. An annular projection 41 fitting air tightly on an outer peripheral face of the container 3 and an elastic component 5 coming close onto the tip opening 21 are provided to an inner face of the cap 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ballpoint pen. A tip for rotatably holding a ball in a non-forward biased state at a tip end for discharging ink at the time of writing and air suction accompanying the discharge of the ink, and a tip provided with the tip, and a relatively high-viscosity ink is provided inside. The present invention relates to a ballpoint pen including a container for storing.

[0002]

2. Description of the Related Art Conventionally, as a ballpoint pen of this type, for example, Japanese Utility Model Publication No. Hei 8-6550 discloses that a gap size in which a ball in a chip can be moved is made relatively small (specifically, the front and rear sides). 5 to 15 μm in the direction, 1 in the left and right direction
5 to 40 μm), a ballpoint pen-type applicator that dries and solidifies the film-forming ink when not in use, seals the gap, and eliminates the need for a valve mechanism (components such as valves, valve seats, and springs). It has been disclosed.

[0003]

The above-mentioned conventional applicator includes:
The tip port is sealed with the dried and solidified ink.However, the dried and solidified ink alone cannot reliably seal the tip port, and the airtightness is insufficient to prevent evaporation of the ink in the container. is there. Further, the dried and solidified ink has an unstable adhesion to the tip port, and may be peeled off from the tip port by a slight impact.

In addition, when the conventional applicator is stored for a long period of time with the tip opening upward, the ink in the chip drops back, and in use, even when the tip opening is downward, the ink is instantly applied to the tip opening. Is not supplied, which may irritate the user.

In addition, in the conventional applicator, the movable amount of the ball in the axial direction is set relatively small.
Ink outflow from the tip end to the outside is poor, and handwriting blur is likely to occur. In order to solve the problem, a means for pressurizing the inside of the container (for example, a flexible container) is required.

[0006] In the above-mentioned conventional applicator, a correction liquid is employed as a coating liquid (ink). The correction liquid generally contains a pigment made of titanium oxide having a relatively small particle size. With the small ball movable amount,
Helped by the small particle size of the pigment, barely,
Only a small amount of ink to be applied to the correction portion is secured, and it is not suitable for continuous writing without interruption in handwriting that requires ample ink ejection. In particular, with the above-described conventional small ball movement amount, in the case of a pearl pigment or an aluminum powder pigment having a relatively large particle diameter of the ink pigment, the outflow property of the ink from the front end port is hindered, and handwriting is likely to occur.

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned conventional problems, and to improve the sealing property of the tip port when not in use, prevent the ink from dropping back in the tip, and prevent the tip port from being used during use. An object of the present invention is to provide a ball-point pen that improves ink outflow.

[0008]

[Means for Solving the Problems]

(Summary) The present invention comprises a chip 2 for rotatably holding a ball 22 in a non-forward biased state at a tip end port 21 for discharging ink at the time of writing and air suction corresponding to the ink discharge, and a pigment ink 9 inside. And a container 3 provided with the tip 2 at the tip so that the tip port 21 communicates with the inside, and a cap that hermetically fits with the outer peripheral surface of the container 3 and seals the tip port 21. 4 (claim 1).

According to the above configuration (claim 1), the distal end port 21
Even if the sealing due to drying and solidification of the pigment ink 9 is incomplete, the cap 4 is securely sealed by the airtight fit of the outer peripheral surface of the container 3. As a result, evaporation of the solvent in the ink 9 is suppressed, and solidification of the ink 9 is prevented as much as possible.

[0010] The "non-forward biasing state" means that there is no valve mechanism for biasing the ball 22 forward by a resilient body and pressing the ball 22 against a valve seat (tip edge 25). Say.

[0011] The term "ink ejection during writing and air suction according to the ink ejection" means ink ejection during writing and intake of outside air according to the amount of ink ejection.
That is, the front end port 21 also serves as an ink discharge port and an air suction port during writing.

"To seal the tip port 21" means to dispose the tip port 21 in a sealed space by airtight fitting between the cap 4 and the outer peripheral surface of the container 3.

The chip may be fixed directly to the front end of the container body 31 or may be fixed indirectly via the holder 6.

(Elastic Member) In the ball-point pen 1 (Claim 1), an annular projection 41 is provided on the inner surface of the cap 4 so as to hermetically fit with the outer peripheral surface of the container 3. It is preferable to provide an elastic member 5 which is in close contact with the end opening 21 and which closes the distal end opening 21 (claim 2).

According to the above configuration (claim 2), the tip 2 can be sufficiently sealed by disposing the tip 2 in a sealed space by hermetically fitting the annular projection 41 on the inner peripheral surface of the cap 4 and the outer peripheral surface of the container 3. Of course, in addition, the elastic member 5
The contact between the tip and the tip of the tip 2 makes the tip port 2
1 can be securely sealed, and even if the tip port 21 is kept upward and stored for a long time, air does not enter from the tip port 21 and the ink 9 in the chip 2 does not drop back (FIG. 1).
reference). As a result, when the tip port 21 is changed from the upward state to the downward state, the ink 9 is immediately supplied to the tip port 21 and writing is possible (see FIG. 2).

The elastic member 5 makes the elastic member 5 and the tip of the tip 2 sufficiently close to each other by utilizing a repulsive force due to elastic deformation, thereby further securely closing the distal end opening 21. The elastic member 5 is preferably made of a discontinuous porous elastic material. Specifically, synthetic rubber with excellent gas barrier properties, for example, silicon rubber, isoprene rubber, butadiene rubber,
Styrene-butadiene rubber, ethylene-propylene rubber, chloroprene rubber, acrylonitrile-butadiene rubber, butyl rubber, ethylene-vinyl acetate rubber, polysulfide rubber, hydrin rubber, urethane rubber, fluorine rubber and the like are effective. Further, the shape of the elastic member 5 may be an integrally formed member including a mortar-shaped cup part 51 and an annular support part 52 in which the cup part 51 is disposed, in addition to a spherical body and a plate-shaped body. Good.

(Amount of Ball Moveable in Axial Direction) In the ball-point pen 1 (claim 1 or claim 2), the amount of axial movement L of the ball 22 is set to 20 μm to 60 μm.
It is effective to set m. (See Fig. 3)

The axially movable amount L of the ball 22 is 2
By setting the thickness to 0 μm to 60 μm, a sufficient amount of ink outflow performance is obtained so that an excessive amount of the ink 9 does not flow out of the front end port 21 during writing, and there is no break in handwriting even when writing continuously. If the movable amount L is smaller than 20 μm, the amount of ink spill is insufficient, and the handwriting is likely to be interrupted. If the movable amount L is larger than 60 μm, not only the ink 9 may flow out excessively, but also the ball may be lost during writing. When the ball 22 is buried in the chip and the mouth portion (inwardly deformed portion 25) of the tip port comes into contact with the paper surface, a smooth writing feeling may not be obtained, or the ball holding force becomes insufficient and the ball 22 becomes This is because there is a risk of dropping out of the device 21.

When the axially movable amount L of the ball 22 is 20 μm to 60 μm, the ink 9 is not limited to a correction ink containing a titanium oxide pigment, but is preferably 5 μm to 6 μm.
An ink containing a pigment having an average particle size of 0 μm is optimal. That is, even if a pigment (for example, a pearl pigment or an aluminum powder pigment) having a relatively large average particle diameter of 5 μm to 60 μm is contained in the ink, the ball 2
By setting the axially movable amount L of No. 2 to a relatively large value of 20 μm to 60 μm, smooth writing is possible without hindering the ink outflow property.

[0020]

Embodiments of the present invention will be described with reference to the drawings.

FIGS. 1, 2 and 3 show an embodiment of the ballpoint pen 1 of the present invention. FIG. 1 is a longitudinal sectional view of a non-use state in which a cap 4 is mounted on the chip 2 side and the chip 2 is directed upward. FIG. 2 is a vertical cross-sectional view of the used state in which the cap 4 is removed and the chip 2 faces downward. FIG. 3 is an enlarged longitudinal sectional view of a main part of the chip 2 showing the movable amount L of the ball 22 in the front-back direction.

The ball-point pen 1 mainly has a ball 22 at its tip.
And a container 3 provided with the tip 2 at a tip thereof, and a cap 4 attachable to a front portion of the container 3. Further, the container 3 includes a container body 31,
It comprises a holder 6 and a packing 7.

(Container) The container body 31 is a bottomed cylindrical body made of a synthetic resin (for example, a blow-molded body of polyethylene resin), and has an opening 32 at the front end. A holder 6 made of a synthetic resin (for example, an injection-molded article of polyacetal resin) is screwed to the outer peripheral surface of the opening 32 by fitting with a left-hand screw, and is adhered to the screw portion with an adhesive. The tip 2 is press-fitted and fixed to the front end of the holder 6.

The container body 31 and the holder 6
A packing 7 made of a synthetic resin (for example, an injection-molded article of a polyacetal resin) is interposed therebetween. The packing 7 includes a disc-shaped flange portion 71 and a cylindrical tubular portion 72.
Consisting of The flange 71 is provided on the inner step 63 of the holder 6.
And the front end face of the container body 31, and at the same time, the outer peripheral surface of the cylindrical portion 72 located before and after the flange 71 closely fits the inner peripheral surface of the opening 32 of the container main body 31 and the inner peripheral surface of the holder 6. This prevents liquid leakage to the outside. In the packing 7, the rear end of the cylindrical portion 72 protrudes into the container main body 31, four projections 73 are provided radially on the inner surface of the opening at the rear end of the cylindrical portion 72, and a weight receiving seat is provided. Is formed. When the tip 2 is turned downward, the weight member 8
Is locked to the weight receiving seat in a state where ink can flow.

(Ink) Ink 9 is prepared by mixing pearl pigment and aluminum powder pigment in a solvent such as water,
A relatively high-viscosity metallic glossy color ink (a so-called metallic color ink) dispersed in about 30% by weight. The pearl pigment is a pigment exhibiting an iris in which the surface of a mica piece is coated with a colorant such as a metal oxide such as titanium oxide or iron oxide, carbon black, or an organic pigment, and has an average particle diameter of 5 μm to 60 μm. Is done. Further, the aluminum powder pigment is a flaky particle having an average particle diameter of 5 μm.
m to 30 μm are employed.

(Weight member) In the container body 31,
A weight member 8 (for example, a metal ball having a weight of 1.06 g and an outer diameter of 6.35 mm) for stirring the ink 9 includes:
And the ink 9. Thereby, the pigment in the ink 9 which tends to settle and separate can be instantly redispersed by stirring.

(Chip) As shown in FIG.
Are a plurality (specifically, four pieces) of ball receiving seats formed by pressing and deforming the vicinity of the tip of a metal cylindrical pipe 23 (for example, a stainless steel pipe having an outer diameter of 1 mm and an inner diameter of 0.73 mm) inward. ) And an inwardly deformed portion 25 formed by pressing and deforming the distal end of the pipe 23 inward.
Thus, the ball 22 is rotatably held at the tip.

The ball 22 is a spherical body made of cemented carbide having an outer diameter of 0.7 mm. Here, the axial ball 22
Is set to 20 μm to 60 μm, and the movable amount of the ball 22 in the radial direction is set to 20 μm to 40 μm.
Is set to

(Cap) The cap 4 is a bottomed cylindrical body made of a transparent synthetic resin (for example, an injection-molded body of a polycarbonate resin). A clip 43 is integrally formed outside the cap 4. An elastic member 5 is disposed inside the cap 4. The elastic member 5 is colored according to the ink color, and the ink color can be identified from the outside by the transparent body of the cap 4.

On the inner peripheral surface of the cap 4, an annular projection 41 and a dot-like projection 42 are integrally provided at front and rear positions. The annular projection 41 hermetically fits with an annular smooth surface 61 on the outer peripheral surface of the holder 6. On the other hand, the point-like projections 42 are a plurality of (four in this case) support projections distributed at equal intervals circumferentially on the inner surface, and fit over the annular convex portion 62 on the outer peripheral surface of the holder 6.

(Elastic Member) The elastic member 5 is pressed into the cap 4 and attached to the inner wall of the cap 4. Specifically, the outer peripheral surface of the elastic member 5 is held by a plurality of axial ribs provided on the inner peripheral surface of the cap 4. The elastic member 5 is made of synthetic rubber (for example, ethylene-propylene rubber), and has a mortar-shaped inner surface.
1 and the cup 51
And an annular support portion 52 in which is disposed. When the cap 4 is attached to the front part (the chip 2 side) of the container main body 31, the tip of the chip 2 is brought into close contact with the mortar-shaped inner surface of the cup part 51, and the tip end port 21 is sealed. Thereby, even if the pen tip is turned upward, the ink 9 is held in the chip 2, so that it is possible to prevent air from entering the container 3 from the front end port 21 (see FIG. 1).

Further, the tip of the tip 2 is pierced into the elastic member 5 by the mortar-shaped inner surface of the cup portion 51 so that the elastic member 5
The tip of the chip 2 can be hermetically sealed with a slight elastic deformation without damaging the tip 2. Accordingly, when the cap 4 is attached, the tip end 2 is formed by soft contact between the tip 2 and the elastic member 5.
1 can be sealed, and the elastic member 5 by the tip of the tip 2
And the sealing function of the distal end port 21 is satisfied for a long time. The tip of the tip 2 having an outer diameter of 1 mm or less is sharpened and the elastic member 5 is easily damaged. However, in the present embodiment (tip outer diameter: outer diameter 1 mm), the elastic member 5 having the cup portion 51 is employed. Therefore, damage due to the chip 2 is avoided.

In this embodiment, the type in which the container 3 storing the ink 9 is directly used as a barrel is used. Therefore, as shown in FIG. 2, when writing, the cap 4 is removed from the front of the container 3 and the tip 2 is gripped with the tip facing downward, the air inside the container 3 expands due to the body temperature of the hand, and the inside of the container 3 is slightly reduced. Pressurized state. In addition, the ball 22
20 μm to 60 μm larger than conventional
Since it is μm, there is no need to press the container 3 as in the related art, enabling abundant ink ejection and continuous handwriting without blurring.

[0034]

According to the ball-point pen of the present invention, for example, the tip port formed by drying and solidifying the pigment ink is provided by the structure of claim 1 (particularly, the ball-point pen is provided with a cap hermetically fitted to the outer peripheral surface of the container and sealing the tip port). Even if the seal is incomplete, the cap is tightly fitted to the outer peripheral surface of the container, so that the distal end port is securely sealed. As a result, the evaporation of the solvent in the ink is suppressed, the solidification of the ink is prevented, and the ink can be used for a long time.

According to a second aspect of the present invention, in particular, the annular projection is provided in the cap in an airtight manner with the outer peripheral surface of the container, and the elastic member presses the tip end of the tip to close the tip end. For example, in addition to the hermetic fit between the annular seal portion and the outer peripheral surface of the container, the chip is sealed, and the elastic member enables a more reliable sealing of the tip port, and the tip port is stored for a long time with the tip port facing upward. However, the air in the tip does not drop back due to the infiltration of air from the tip end.
As a result, when the front end is changed from the upward state to the downward state, ink is immediately supplied to the front end and writing is possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an unused state of an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a use state of the embodiment of the present invention.

FIG. 3 is an enlarged vertical sectional view of the chip of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball-point pen 2 Tip 21 Tip mouth 22 Ball 23 Cylindrical pipe 24 Inwardly projecting part 25 Inwardly deformed part 3 Container 31 Container main body 32 Opening 4 Cap 41 Annular projection 42 Point-like projection 43 Clip 5 Elastic member 51 Cup part 52 Annular Supporting part 6 Holder 61 Annular smooth surface 62 Annular convex part 63 Inner step part 7 Packing 71 Flange part 72 Cylindrical part 73 Projection 8 Weight member 9 Ink L Ball axial movement amount

Claims (2)

[Claims] A tip (2) for rotatably holding a ball (22) in a non-forward biased state at a tip end port (21) for discharging ink at the time of writing and air suction corresponding to the ink discharge;
A ballpoint pen comprising: a container (3) having a tip (2) at a tip thereof for storing a pigment ink (9) therein and allowing a tip port (21) to communicate with the inside; A ball-point pen having a cap (4) which is fitted tightly to the outer peripheral surface and seals the distal end opening (21). 2. An annular projection (41) hermetically fitted to the outer peripheral surface of the container (3) on the inner surface of the cap (4), and the distal end opening (21) of the tip (2) being in close contact with the distal end opening (21). 2. The ballpoint pen according to claim 1, further comprising: an elastic member (5) that closes the opening.