JPH09323495A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument capable of smoothly supplying ink and continuously writing. SOLUTION: The writing instrument comprises an ink reservoir 2, a front plug 3, a tip member 5, a valve 6, a tail plug 7 and a blocking material 8. The valve 6 has a sphere 11 disposed in a valve chamber 10 having an opening at the end. The sphere 11 is pressed to the opening side by an urging means 17 of a gut. The rear end side of the member 5 is brought into contact with the sphere 11 in the valve 6. The member 5 is slightly retracted by the normal writing, the valve 6 is opened, and ink flows out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument, and more particularly to a writing instrument having a liquid ink contained in an ink reservoir.

[0002]

2. Description of the Related Art A writing instrument in which a liquid ink called a free ink type writing instrument is built in an ink reservoir and leaks the ink from a tip of resin, metal, felt, etc., has a vivid color due to the nature of the ink. Widely used.

By the way, since the free ink type writing instrument is one in which the liquid ink is directly contained in the ink reservoir without impregnating the liquid ink, that is, without being impregnated into the filling or the like.
It is difficult to derive an appropriate amount of ink during writing, as compared with a writing instrument having batting. Therefore, in the free-ink writing instrument, various measures have been taken in order to eliminate the blurring and fluffing of the ink.

As an example of a writing instrument of the prior art, a valve plug is interposed between the ink reservoir and the tip member, and when a large amount of ink leaks from the tip member, the ink leaks around the valve plug. Is reduced and the negative pressure opens the valve plug to supply ink to the chip member (JP-A-4-332693, JP-A3-1).
3395 and others). As another example, there is a valve which has a valve at the tip of the ink reservoir and which presses the tip to open the valve and supply ink to the tip member (Japanese Patent Laid-Open No. 4-119897, JP Kaihei 4-332697 and others).

[0005]

The above-mentioned writing instruments of the prior art are all devised with considerable ingenuity.
Although commercialized as a product, there is still room for improvement. That is, among the above-mentioned conventional techniques, the former configuration having a valve plug has a small amount of ink flutter, but on the contrary, there is a complaint that the ink supply is not smooth. Since the configuration that uses the valve stopper generates negative pressure due to the outflow of ink, the valve stopper will not open and ink will not be supplied to the tip member unless there is a considerable amount of ink outflow due to negative pressure generation. . For this reason, this mechanism is difficult to use for writing instruments for fine characters, which consume less ink. In addition, the latter mechanism that pushes the tip to open the valve generally requires a large stroke of the tip to open the valve, and in order to supply ink,
It is necessary to interrupt writing one by one and perform a chip pressing operation.

Therefore, an object of the present invention is to provide a writing instrument in which the writing instrument of the prior art is improved so that ink can be smoothly supplied and continuous writing is possible.

[0007]

The present invention for achieving the above object has an ink reservoir containing ink and a tip member, and the ink in the ink reservoir is guided to the tip member for writing. In the writing instrument according to the present invention, a blocking member and / or a backflow preventing agent slidable in the ink reservoir is arranged in the ink reservoir, and the ink in the ink reservoir is sealed by the blocking member and / or the backflow inhibiting agent. A valve is provided at the tip of the ink reservoir, and the valve has a sphere arranged in a valve chamber having an opening at the tip, and the sphere is pressed toward the opening side by a biasing means, and a tip is provided at the tip side of the valve. The writing instrument is characterized in that a member is provided, and a rear end side of the tip member is in contact with a ball inside the valve.

In the writing instrument of the present invention, when not in use, the ball in the valve chamber is pressed toward the opening of the valve chamber by the biasing means. Therefore, when not in use, the ink reservoir is sealed by the valve, and no ink is supplied. When the tip of the tip member is pressed against paper or the like during writing, the rear end of the tip member directly pushes the ball of the valve to open the opening of the valve chamber. In the present invention, since the sphere is used as the member for closing the opening of the valve chamber, it is possible to completely close the opening of the valve chamber regardless of the posture of the closing member. On the contrary, by slightly pushing up the sphere, it is possible to secure a gap for supplying ink. Therefore, the writing instrument of the present invention,
The ink can be supplied to the tip member by pushing up the sphere by the writing pressure at the time of writing.

In the invention which is an improvement of the above-mentioned invention, the tip member has a tip protection member mounted on the rear end of the tip body, and the rear end portion of the tip protection member is in contact with a ball inside the valve. It is characterized by

The above-mentioned improvement prevents the ink flow path of the chip member from being damaged. That is, a resin-made tip generally used in a writing instrument has a fine communication path inside. The communication passage is open at both ends of the chip, and the ink flows from one end to the other end to guide the ink. However, if the tip body directly pushes the sphere, the tip of the tip body is pained and the opening of the flow passage is clogged. Therefore, in the present invention, a chip protection member is provided at the rear end of the chip body, and a ball is pushed by the chip protection member to prevent clogging of the chip body.

A further improved invention is characterized in that the tip member is arranged in the tip plug, and the tip member is slidable in the tip plug while maintaining an airtight state.

According to the present invention, since the air does not enter the ink reservoir side, the ink flow is not only smooth, but also the ink is not blown out due to the rise of the ambient temperature.

Another improvement for the same purpose as the above-mentioned improvement is that the tip member is disposed in the tip plug, and the tip surface of the tip member is provided with an annular protrusion, and the tip member has the annular shape. It is characterized in that it can slide inside the front plug while being in contact with the protrusion.

Further, it is desirable that the tip member is arranged in the tip plug, and the ink occlusion body is arranged around the tip member.

Another aspect of the present invention, which is an improvement of the above-mentioned invention, is that a tip of the ink reservoir is provided with a tip plug, the tip member is held by the tip plug, and the tip plug is removable from the ink reservoir. Yes, the ball of the valve is rotatable,
The feature is that the ink can be directly transferred from the ball by removing the tip plug.

In the writing instrument of the present invention, the bulb of the valve can be exposed by removing the tip plug. Then, the ball can be directly pressed against a paper or the like to write a character or the like. Therefore, in the present invention, writing with a chip and writing with a ball can be performed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. FIG. 1 is a cross-sectional view of a writing instrument according to a first embodiment of the present invention, (a) shows a state when the writing instrument is not used, (b) shows a state when it is used, (c)
Shows (A) sectional view of the valve chamber of (a), and (d) shows
The BB sectional drawing of the valve chamber of (a) is shown. FIG. 2 is a cross-sectional view of a writing instrument showing a second embodiment of the present invention. FIG.
It is sectional drawing of the principal part of the writing instrument which shows the 3rd Embodiment of this invention. FIG. 4 is an exploded perspective view of a main part of a writing instrument showing a third embodiment of the present invention. FIG. 5: is sectional drawing of the principal part of the writing instrument which shows the 4th Embodiment of this invention. FIG. 6 is a perspective view of a writing instrument showing a fifth embodiment of the present invention.

In FIG. 1, reference numeral 1 shows a writing instrument according to the first embodiment of the present invention. The writing instrument 1 of the present embodiment is composed of an ink reservoir 2, a tip plug 3, a tip member 5, a valve 6, a tail plug 7, and an occluding member 8. Explaining sequentially, the ink reservoir 2 is a cylindrical body made of resin such as polypropylene or metal such as aluminum. Ink reservoir 2
The outer shape of is a tubular shape, and the tip side, that is, the tip 3 side is made slightly thinner. The ink reservoir 2 is hollow so that ink can be stored inside.
The tip of the ink reservoir 2 has a narrow inner hollow portion in order to limit the outflow amount of ink.

The front plug 3 is made of the same material as that of the ink reservoir 2 and has a cylindrical rear end and a tapered small front end. The inside of the tip plug 3 is hollow, and an opening 13 is provided at the tip portion. The inner diameter of the tip plug 3 is equal to the outer shape of the tip portion of the ink reservoir 2 described above for the cylindrical portion. The outer shape of the front plug 2 is
It is equal to that of the portion other than the tip of the ink reservoir 2 described above.
The tip plug 3 is inserted into the thin portion of the tip of the ink reservoir 2 and can be easily attached and detached.

The valve 6 has a valve chamber 10 and a ball 11 built therein. The valve chamber 10 is made by injection molding of resin or cutting using metal as a material, and the structure is just the same as the tip portion of the ballpoint pen. That is, valve chamber 1
A space is provided inside 0, and the tip of the space is tapered. And the opening 13
Is provided. The diameter of the opening 13 is about 50% to 95% of the diameter of the sphere 11.

On the rear end side of the valve chamber 10, a groove 1 in the shape of an arrow groove is formed.
5 are provided. Further, a through hole 16 is provided at the rear end of the valve chamber 10. The inner volume of the valve chamber 10 is a ball 1
1 can move slightly. More specifically, the amount of movement of the sphere 11 from the state in which the sphere 11 is sandwiched by the opening 13 at the front end to the state in which it is in contact with the groove 15 on the rear end side is 0.1 m.
m to about 1 mm, more preferably 0.2 mm
Is designed to be about 0.4 mm. The internal volume of the valve chamber 10 is designed so that the ball 11 can rotate.

The ball 11 in the valve chamber 10 may be made of resin, but is preferably made of metal as used in a normal ballpoint pen.

The diameter of the sphere is about 0.3 mm to 2.0 mm, more preferably 0.5 mm to 1.0 mm.
It is a degree. The valve 6 is attached to the tip portion of the ink reservoir 2 with the ball 11 arranged inside. A biasing member 18 is built in the through hole 16 at the rear end of the valve chamber 10. The biasing member 18 is made of thin wire such as nylon tex and wire Harris. Urging member 1
8 has one end engaged with a not-shown locking portion of the ink reservoir 2 and the other end abutting a ball 11 in the valve chamber 10. Therefore, the ball 11 of the valve 6 is pressed against the opening of the valve chamber 10 and the ball 1
Part 1 is exposed from the opening.

The tip member 5 is made of known resin or fiber,
Alternatively, a metal is used as a raw material, and the ink is exuded by a capillary phenomenon or the like. The chip member 5 may be made of a single material, but may be made of a resin chip and a junction member made of a fiber bundle. It may be a so-called brush pen type chip. As shown in FIG. 1, the tip member 5 is held by the hole of the tip plug 3. The tip member 5 is the plug 3
It is slightly slidable with respect to. Further, the tip end portion of the tip member 5 is projected from the hole of the front plug 3 so that characters and the like can be written, and the rear end portion of the tip member 5 is provided with the valve 6 described above.
Is in contact with the ball 11.

On the other hand, the ink reservoir 2 contains water-based ink or the like. A blocking member 8 is built in the ink reservoir 2. The blocking member 8 is made of rubber or resin. Rubber is more preferable as the material for the occluding material. As for the cross-sectional shape of the occluding material 8 used in the embodiment of FIG. 1, the central portion has a convex shape toward the front plug side. Blocking material 8
Is at the boundary portion of the ink, and the ink is sealed by the closing member 8. The occluding member 8 slides toward the front plug 3 side as the ink is consumed.

The tail of the ink reservoir 2 is covered with a tail plug 7. The tail plug 7 is provided with an air hole 20 in order to prevent a negative pressure inside.

Next, the operation of the writing instrument 1 of this embodiment will be described. The writing instrument 1 of the present embodiment, when not in use,
In the state as shown in FIG. 1A, in the valve 6, the urging means 17 is used.
Causes the ball 11 to be pressed against the opening of the valve chamber 10 and the opening 13 of the valve chamber is closed. Therefore, ink is not supplied from the ink reservoir 2 and the ink does not spill.

At the time of writing, the state shown in FIG. 1B is reached, and the tip member 5 is pushed by the writing pressure, and the force moves the ball 11 to the arrow groove 15 side to open the opening of the valve chamber 10. In the present embodiment, the movement amount of the sphere 11 is 0.
It is about 1 mm to 1 mm, and the force required for movement is
Since the weight is about 100 g or less, the user hardly feels that the tip has moved. Further, since the valve 6 is opened by writing pressure, it is always open during writing, and there is no need for the operation of interrupting writing and strongly pressing the chip as in the conventional case.

The writing instrument 1 of this embodiment can also be used as a ballpoint pen. That is, when using as a ball-point pen, the tip plug 3 is removed and the valve 10 is exposed. As described above, the valve 10 is configured such that the opening 13 is closed by the sphere 11, and a part of the sphere 11 is exposed from the opening 13. The ball 11 can rotate in the valve chamber 10. Therefore, when the ball 11 is directly pressed, the ink of the ball 11 can be transferred to paper or the like like a normal ballpoint pen.

The writing instrument 30 shown in FIG. 2 is the second embodiment of the present invention.
1 shows an embodiment. In the writing instrument 30, the ink reservoir 31 and the tip plug 32 are integrally formed, and therefore the tip plug 32 cannot be removed. In the writing instrument 30, the tip end side of the ink reservoir 31 is made small in both inner and outer diameters, and a separately molded valve 33 is inserted into the inside.
The valve 33 has a ball 35 inside a valve chamber,
Although the opening of the valve chamber is sealed by the sphere 35, the point different from the previous embodiment is that the biasing means 34 employs a coil spring in the present embodiment.

Further, in this embodiment, urethane cotton 36 (ink occlusion body) is incorporated inside the front plug 32 portion.
The urethane cotton 36 functions to absorb the excess ink of the tip member 38 and to replenish the ink from the urethane cotton 36 to the tip member 38 when the ink of the tip member 38 is insufficient. Also in the writing instrument 30 of the present embodiment,
The tip member 38 is held by the hole of the front plug 32, and the rear end is in contact with the ball 35 of the valve 33, which is the same as the previous embodiment. Further, a rubber elastic blocker 39 is arranged in the ink reservoir 31 and slides in the ink reservoir 31 as ink is consumed.

Writing instrument 50 of the third modification shown in FIG.
2 is different from the modification of FIG. 2 in the configuration of the tip member 51 and the internal shape of the tip plug 52. Other components of the writing instrument 50, that is, the ink reservoir 31, the valve 33, the ball 3
5, the biasing means 34, and the urethane cotton 36 are the same as in the previous embodiment.

In the writing instrument 50 of the third embodiment, the tip member 51 has a tip protecting member 56 attached to the rear end of a resin tip body 56. The chip protection member 56 is
It is made of resin by injection molding or metal, and has a tubular shape as shown in FIG. One end of the chip protection member 56 is open and the other end is provided with a bottom 57. Further, an ink circulation hole 58 is provided in the bottom 57 of the chip protection member 56.

An annular projection 59 is provided on the inner surface of the front plug 52. In the state where the tip member 51 is built in the tip plug 52, the bottom 57 of the tip protection member 56 of the tip member 51 is in contact with the ball 35 of the valve 33. Therefore, in this embodiment, the tip member 51 is not damaged, and the ink flow is smooth forever. Further, when the tip member 51 is built in the front plug 52, the tip protection member 56
The side surface of the tip member abuts on an annular projection 59 provided in the tip plug 52, and the tip member 51 can slide inside the tip plug 52 in a state of abutting the annular projection 59. In this embodiment, the airtightness inside and outside is maintained with the projection 59 as a boundary, so that air does not enter the ink reservoir 31.

In the third embodiment, the annular protrusion 59 is provided inside the front plug 52. However, even if the annular protrusion is provided at another portion, the invasion of air into the ink reservoir 31 is prevented. Can In FIG. 5, the ring-shaped protrusion 60 is attached to the chip protection member 61.
This is an example in which the airtightness is maintained by providing the ring-shaped protrusion 60 with the tip main body 55 so as to be provided on the inner peripheral surface thereof. FIG.
In the embodiment,
Although it is provided only on the inner peripheral surface of the
It may be provided on the inner circumference of the front plug 52 as well as on the inner circumference.

The modification shown in FIG. 6 represents a mode closer to practical design. The writing instrument 40 shown in FIG.
It is composed of an ink reservoir 41, a tip plug 42, and a cap 43. These are integrated as shown in FIG. 6 (b) and can be easily removed as shown in FIG. 6 (a).

The ink reservoir 41 is a cylindrical body made of polyethylene resin, and the tip portion is made thin in two steps. A water-based ink is contained in the ink reservoir 41 as in the previous embodiment, and the ink is sealed by a blocking member (not shown). A valve 45 is inserted into the opening at the tip of the ink reservoir 41. The valve 45 is made by cutting metal and has the same shape as the pen tip of a ballpoint pen. That is, the sphere 46 is built in the sphere storage chamber (not shown), and a part of the sphere 46 is exposed from the opening. The difference between the valve 45 and a normal ball-point pen tip is that the ball 45 has a large play, and the ball 46 has a pitch of 0.
It can be retracted inward from 2 mm to 0.4 mm. Further, the finish of the inner surface of the opening of the ball storage chamber is precise, and the contact of the ball 45 ensures liquid tightness. Also valve 45
A gusset-like urging member is built in the inside of (not shown).

The front plug 42 has a cylindrical shape that penetrates it, and is tapered toward the tip. A brush pen type tip member 48 is disposed on the front plug 42. Chip member 4
When the front plug 42 is attached to the ink reservoir 41, the rear end of the blade 8 comes into contact with the ball 46 of the valve element 45 described above. When the writing instrument 40 of the present embodiment is used as a writing pen, the cap 43 is removed and writing is performed with the tip member 48. Also, if you want to use it as a ballpoint pen, use the plug 42
Remove and use the ball 46 by pressing it against paper or the like.

In the above embodiment, the ink reservoirs 2, 31
The example in which the blocking members 8 and 39 made of rubber or the like are arranged in the inside is shown, but instead of the blocking member, a backflow preventing agent such as polybutene may be filled.

[0040]

When the writing instrument of the present invention is not used, the sphere in the valve chamber is pressed toward the opening of the valve chamber by the biasing means, so that no ink is supplied and ink does not flutter. Further, when the tip end of the tip member is pressed against paper or the like during writing, the sphere is pushed up by the writing pressure during writing and ink can be smoothly supplied to the tip member. Therefore, the writing instrument of the present invention does not cause ink dripping and does not require an operation of stopping writing in order to supply ink to the tip.

Further, the writing instrument of the present invention has an effect that it can be used as a ballpoint pen as well as writing with a pen tip such as felt with one writing instrument.

In addition, the invention according to claim 3 has an effect that the chip has less pain and can be used for a long period of time.

Further, the inventions of claims 4 and 5 have an effect of preventing ink from being blown out due to an increase in ambient temperature.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a writing instrument according to a first embodiment of the present invention, (a) showing a state when the writing instrument is not used, (b)
Shows the state at the time of use, and (c) shows A of the valve chamber of (a).
-A sectional drawing is shown and (d) shows the BB sectional drawing of the valve chamber of (a).

FIG. 2 is a cross-sectional view of a writing instrument showing a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of a writing instrument showing a third embodiment of the present invention.

FIG. 4 is an exploded perspective view of a main part of a writing instrument showing a third embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a writing instrument showing a fourth embodiment of the present invention.

FIG. 6 is a perspective view of a writing instrument showing a fifth embodiment of the present invention.

[Explanation of symbols]

1,30,40,50 Writing instrument 2,31,41 Ink reservoir 3,32,43,52 Tip plug 5,28,48 Tip member 6,33,45 Valve 8,39 Closing material 11,35,46 Ball 36 Urethane Cotton (ink absorber) 55 Chip protection member 59 Annular protrusion 60 Annular protrusion

Claims (6)

[Claims] 1. A writing instrument having an ink reservoir containing ink and a tip member, wherein ink in the ink reservoir is guided to the tip member for writing, and slides in the ink reservoir. A possible plugging material and / or anti-backflow agent is arranged, the ink in the ink reservoir is sealed by the plugging material and / or anti-backflow agent, a valve is provided at the tip of the ink fountain, and the valve is A sphere is arranged in a valve chamber having an opening at its tip, the sphere is pressed toward the opening side by a biasing means, a tip member is provided further on the tip side of the valve, and the rear end side of the tip member is a sphere inside the valve. A writing instrument characterized by being in contact with. 2. The tip member, wherein a tip protection member is attached to the rear end of the tip body, and the rear end portion of the tip protection member is in contact with a ball inside the valve. Writing instrument. 3. The writing instrument according to claim 1, wherein the tip member is disposed in the tip plug, and the tip member is slidable in the tip plug while maintaining an airtight state. 4. The tip member is disposed in the tip plug, and an annular projection is provided on the inner surface of the tip plug, and the tip member is slidable in the tip plug while being in contact with the annular projection. The writing instrument according to any one of claims 1 to 3, wherein 5. The writing instrument according to any one of claims 1 to 4, wherein the tip member is arranged in a tip plug, and an ink occlusion body is arranged around the tip member. 6. A tip plug is provided at the tip of the ink fountain, the tip member is retained by the tip fountain, the tip cap is removable from the ink fountain, and the bulb of the valve is rotatable. The writing instrument according to any one of claims 1 to 5, wherein the ink can be directly transferred from the ball by removing the plug.