JP4884669B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument including a correction applicator, which relates to a writing instrument that discharges ink in an ink tank from the writing unit to the outside, and particularly relates to a writing instrument having a structure that allows gas to permeate into and out of the ink tank. It is.

Conventionally, in this type of invention, as described in Patent Document 1, the internal solution stored in the body shaft (6) is caused to flow out of the pen tip application body (10) to be applied. An applicator adapted to be applied and having a pressure reducing compensation valve (28) provided with a film body made of a moisture permeable and waterproof material is known.
According to this prior art, when the inner solution is discharged from the application body (10), the external gas is passed through the film body through the film body (with the decrease in the content liquid on the body shaft (6) side. 6) is fed into. Since the film body is made of a moisture-permeable / water-proof material, the inner solution on the main body shaft (6) side is prevented from being transmitted to the outside.

However, when a water-based ink is used as the content liquid, the water-based ink of a normal liquid writing instrument contains a surfactant, so that the water-based ink has a surface tension lowering action and an interface adsorption action of the surfactant. Etc., the film body is soaked and further passes through the film body.
When oil-based ink is used as the internal solution, the oil-based ink of a normal liquid writing instrument contains alcohol and has a relatively low surface tension. Therefore, the oil-based ink is the same as in the case of the water-based ink. The film body is soaked and further passes through the film body.
In some cases, a surfactant is added to the oil-based ink. In this case, since the surface tension is further lowered, the oil-based ink is more likely to pass through the film body.
JP-A-8-300891

  The present invention has been made in view of the above-described conventional circumstances, and a problem to be solved by the present invention is that the gas can flow into and out of the ink tank by the gas permeable film, and the ink is permeable to the gas regardless of the type of ink. An object of the present invention is to provide a writing instrument that can prevent leakage through the outside.

The technical means for solving the above-mentioned problem is a writing instrument that discharges ink in an ink tank from a writing unit, and the writing instrument that includes a ventilation film that allows gas to permeate into and out of the ink tank. The membrane is a semi-permeable membrane that is permeable to gas and that blocks the permeation of ink, and is subjected to a water and oil repellent treatment, and a reinforcing gas permeable membrane is superimposed on the entire outer surface of the gas permeable membrane without any gaps, In addition to preventing deformation of the gas permeable membrane without impairing the air permeability of the gas permeable membrane , the internal gas is discharged to the rear end surface of the reinforced gas permeable membrane when the pressure in the ink tank rises above a predetermined value. The valve means is overlapped , and the valve means is provided with a cut in the elastic plate-like body that penetrates in the thickness direction. In the normal state, the cut is closed so as not to allow ventilation, and the pressure in the ink tank is predetermined. value When became above, characterized in that the cut to deform outwardly to the ventilation state.
In a further technical means, the cut is formed in a cross shape .
Further, according to another technical means, a writing instrument that causes ink in an ink tank to be ejected from a writing unit, the writing instrument including a ventilation film that allows gas to permeate into and out of the ink tank. A semi-permeable membrane that is permeable to gas and that blocks the permeation of ink is subjected to water and oil repellency treatment, and is provided with two air permeable membranes, one of which is a first gas permeable membrane and the other is a second permeable membrane. A gas permeable membrane that is longer than the depth of the stored ink is provided in the axial direction in the ink tank, and the first gas permeable membrane is provided as an outer wall on the rear end side of the ink tank. The second gas permeable membrane is disposed in the ink tank so as to close the opening on the front end side of the gas permeable tube, and the gas permeable tube has a rear end at the rear of the ink tank. Connect to the outer wall on the end side and the rear end Characterized in that toward the opening to the outside.
Further, according to another technical means, a writing instrument that causes ink in an ink tank to be ejected from a writing unit, the writing instrument including a ventilation film that allows gas to permeate into and out of the ink tank. A semipermeable membrane that is permeable to gas and that blocks ink permeation is subjected to water and oil repellency treatment, and a space outside the gas permeable membrane is sealed with a flexible membrane. .
Further, according to another technical means, a writing instrument that causes ink in an ink tank to be ejected from a writing unit, the writing instrument including a ventilation film that allows gas to permeate into and out of the ink tank. A semi-permeable membrane that is permeable to gas and that blocks ink permeation, is subjected to water and oil repellency treatment, and has a substantially bottomed tubular ventilation tube with the bottom facing forward in the ink tank. A ventilation tube longer than the depth of the stored ink is provided in the axial direction, and this ventilation tube allows gas to pass through and passes through the bottom of the front end side of the tube. The ventilation tube has a rear end connected to the outer wall on the rear end side of the ink tank, and the rear end opening is directed to the outside. The air-permeable membrane is provided as described above. Together is arranged as a rear end side outer wall of the Nkutanku, characterized in that it covers the opening portion of the rear end of the ventilation tube.
Further, according to another technical means, a writing instrument that causes ink in an ink tank to be ejected from a writing unit, the writing instrument including a ventilation film that allows gas to permeate into and out of the ink tank. A semi-permeable membrane that is permeable to gas and that blocks the permeation of ink is subjected to water and oil repellency treatment, and is provided with two air permeable membranes, one of which is a first gas permeable membrane and the other is a second permeable membrane. The first gas permeable membrane is disposed as an outer wall on the rear end side of the ink tank, the second gas permeable membrane is disposed as an outer wall on the front end side of the ink tank, and the ink tank is bottomed. The inside of the cylindrical outer cylinder is fixed, and the writing section is mounted on the front end side in the ink tank, and the front end side portion of the writing section is exposed to the front of the ink tank and the outer cylinder. The writing instrument Between the front end side inner circumferential surface of the outer peripheral surface of the writing portion and the ink tank, and a second reinforcing breathable film which is superimposed on the outer side of the second gas permeable membrane and the second gas permeable membrane, the front end of the ink tank A first air passage that communicates with the opening and is opened to the outside is provided, and the first air passage and the first air passage are overlapped between the outer cylinder and the ink tank . a first reinforcing breathable film, communicated with the front end opening of the outer cylinder, the second air passage which is open to the outside without passing through the first air passage is provided, the front end opening of said barrel The front end opening of the ink tank and the writing part are sealed with a removable cap.

In the first aspect, the writing instrument is configured to eject ink in the ink tank from the writing unit, and the writing instrument includes a gas permeable film that allows gas to permeate into and out of the ink tank. A semipermeable membrane that is capable of blocking the permeation of ink is subjected to a water / oil repellent treatment.
In the second embodiment , a reinforcing gas permeable film is superposed on the outside of the gas permeable film so as to prevent deformation of the gas permeable film .

In the third embodiment , valve means for discharging the internal gas when the pressure in the ink tank rises above a predetermined value is provided outside the gas permeable membrane .

In the fourth embodiment , the space outside the gas permeable membrane is sealed with a flexible membrane .

In the fifth embodiment , two gas permeable membranes are provided, one of which is the first gas permeable membrane and the other is the second gas permeable membrane, and the gas tank has a longer air depth than the depth of the stored ink. The first gas permeable membrane is disposed as an outer wall on the rear end side of the ink tank, and the second gas permeable membrane is disposed in the ink tank. The vent pipe is connected to the outer wall on the rear end side of the ink tank, and the rear end opening is directed to the outside. The

In the sixth embodiment , the ink tank has a substantially bottomed tubular ventilation tube with the bottom facing forward, and the ventilation tube is longer than the depth of the stored ink. The ventilation tube is provided with a through-hole set at an opening area that allows gas to pass and prevents ink from passing through at the bottom on the front end side. The tubular body is provided such that the rear end thereof is connected to the outer wall on the rear end side of the ink tank and the opening of the rear end is directed to the outside, and the ventilation film is provided on the outer wall on the rear end side of the ink tank. together they are arranged as, that covers the opening of the rear end of the ventilation tube.

In the seventh embodiment , the two gas permeable membranes are provided, one of which is a first gas permeable membrane and the other is a second gas permeable membrane, and the first gas permeable membrane is an outer wall on the rear end side of the ink tank. In addition, the second gas permeable membrane was disposed as an outer wall on the front end side of the ink tank .

According to an eighth aspect , the ink tank is fixed inside the bottomed cylindrical outer cylinder, and the writing unit is exposed to the outside of the outer cylinder. An air passage that communicates the first air-permeable membrane on the rear end side of the ink tank and the front end opening of the outer cylinder is secured between the ink tank, the front end opening of the outer cylinder, and the second The gas permeable membrane and the writing part were sealed with a removable cap .

Further, in the ninth embodiment , the writing section is composed of a large number of fiber members so as to guide the ink in the ink tank to the front end side, and the large number of fiber members are arranged such that the inside of the ink tank is higher than the writing tip side. that is configured to density.

Further, in the tenth embodiment, the writing unit, that have been extended to the rear end or the vicinity of the rear end portion of the above ink tank.

  The ink includes a water-based ink for writing instruments, an oil-based ink for writing instruments, and a correction liquid that is a content liquid of a correction applicator.

The water / oil repellent treatment may be provided on one or both surfaces of the semipermeable membrane, and is preferably provided on the ink side surface.
Specific examples of the semipermeable membrane include a fluororesin porous membrane and a polyolefin porous membrane. Examples of the fluororesin include PTFE, polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-ethylene copolymer, and the like. Examples of the polyolefin include polyethylene, polypropylene, poly-4-methyl-1-pentene, poly-1-butene and the like.

In addition, although the structure described as said 2nd thru | or 10 form demonstrates the effect especially effectively by comprising the said air permeable film with the semipermeable membrane to which the water / oil repellent treatment was performed, Even if the gas permeable membrane is composed of a semi-permeable membrane that has not been subjected to water / oil repellent treatment, the following effects can be obtained corresponding to each invention.

Since the said form is comprised as demonstrated above, there exists an effect as described below.
According to the first embodiment, when the pressure of the gas in the ink tank rises due to the influence of temperature rise or the like, the gas in the ink tank passes through the ventilation film and is discharged to the outside. The rise can be suppressed. Accordingly, it is possible to prevent ink from being excessively discharged due to an increase in internal pressure.
Further, it is also possible to adopt a configuration in which gas is sucked into the ink tank from the outside through the gas permeable membrane to increase the ink discharge amount from the writing unit.
In addition, even if the ink in the ink tank is a normal writing instrument ink having a relatively low surface tension, such as a water-based ink containing a surfactant, an oil-based ink, an alcohol-based oil-based ink, etc. The air permeable film is repelled by the water and oil repellent surface and is not allowed to pass through the air permeable film.
Therefore, the gas can flow into and out of the ink tank by the gas permeable film, and the ink can be prevented from leaking outside through the gas permeable film regardless of the type of ink.

Furthermore, according to the second aspect , the reinforced gas permeable membrane can prevent the gas permeable membrane from being deformed or damaged due to a pressure difference between the inside and outside of the ink tank. As a result, the ventilation membrane can be handled well in the manufacturing stage of the writing instrument, and productivity can be improved.

Furthermore, according to the third embodiment, when the pressure in the ink tank rises to a predetermined value or more due to a temperature rise or the like, the gas in the ink tank can be discharged to the outside to suppress the increase in the internal pressure. When the pressure in the ink tank rises slightly within a predetermined value due to the volatilization of the ink in the ink tank, the volatilized ink (gas) can be prevented from flowing out to the outside. As a result, volatilization of the ink in the ink tank can be prevented.

Furthermore, according to the fourth embodiment , since the space outside the gas permeable membrane is sealed by the flexible membrane body, the ink (gas) volatilized in the ink tank flows out to the outside through the gas permeable membrane. Can be prevented. In addition, when the pressure in the ink tank rises due to the influence of temperature rise or the like, the rise in the internal pressure can be absorbed and suppressed by deformation of the flexible film body.

Furthermore, according to the fifth embodiment , in the normal writing state in which the writing unit is downward, even if the pressure in the ink tank rises due to the influence of the temperature rise or the like, the ink tank is behind the ink. The gas in the ink tank can be discharged to the outside through the first gas permeable membrane, and the pressure increase in the ink tank can be suppressed.
Further, in the upward writing state, the second gas permeable membrane touches the gas layer moved to the writing portion side in the ink tank, so that the gas when the internal pressure is increased by the second gas permeable membrane is discharged to the outside. An increase in pressure in the tank can be suppressed.
In addition, both the opening for sucking and discharging the gas through the first gas permeable membrane and the opening for sucking and discharging the gas through the second gas permeable membrane are arranged on the rear end side of the ink tank. As a result, the structure on the front end side of the ink tank can be simplified and the productivity can be improved.

Furthermore, according to the sixth embodiment , in the normal writing state in which the writing unit is downward, even if the internal pressure in the ink tank rises due to the effect of temperature rise or the like, the ink tank is behind the ink. The gas in the ink tank can be discharged to the outside through the gas permeable membrane, and the pressure increase in the ink tank can be suppressed.
Also, in the upward writing state, since the penetrating part at the bottom of the ventilation tube touches the gas layer moved to the writing part side in the ink tank, the gas when the internal pressure rises by the penetrating part is discharged to the outside. In addition, an increase in pressure in the ink tank can be suppressed.
Note that even if ink slightly enters the ventilation tube through the through-hole due to an impact such as dropping, the ink will flow out to the outside by covering the opening at the rear end of the ventilation tube. It can be prevented by the breathable membrane.
Moreover, both the opening for sucking and discharging the gas through the gas permeable membrane and the opening for sucking and discharging the gas through the penetrating portion can be arranged on the rear end side of the ink tank, As a result, the structure on the front end side of the ink tank can be simplified and the productivity can be improved.

Further, according to the seventh aspect , in the normal writing state in which the writing unit is downward, even if the internal pressure in the ink tank rises due to the effect of temperature rise or the like, the ink tank has a rear side behind the ink. The gas in the ink tank can be discharged to the outside through the first ventilation film on the rear end side of the ink tank, and the pressure increase in the ink tank can be suppressed.
Further, in the upward writing state, the gas layer moved toward the writing unit in the ink tank is in contact with the second gas permeable film on the front end side of the ink tank, so that the gas when the internal pressure is increased by the second gas permeable film is discharged to the outside. By discharging, the pressure increase in the ink tank can be suppressed.

Further, according to the eighth aspect , the first vent film on the rear end side of the ink tank can be protected by the bottomed cylindrical outer cylinder, and the front end opening of the outer cylinder is not used when the writing instrument is not used. The part, the second gas permeable membrane, and the writing part can be sealed with a removable cap to prevent the ink in the ink tank from volatilizing.

Furthermore, according to the ninth embodiment , the inner side of the ink tank in the writing unit is composed of a relatively high-density fiber member, and therefore has a strong effect of suppressing the circulation of ink. On the other hand, the writing tip side in the writing part is composed of a relatively low-density fiber member, and thus has a strong effect of promoting the circulation of ink.
Therefore, excessive ink is supplied to the rear end of the writing unit due to a rise in pressure in the ink tank due to a temperature rise or a gas flowing into the ink tank through the ventilation film. Even so, the ink can be gradually guided to the low-density fiber member on the writing tip side while being suppressed and distributed by the high-density fiber member inside the ink tank. As a result, it is possible to prevent the ink drop phenomenon in which excessive ink flows out from the tip of the writing unit, to suitably maintain the ink discharge amount from the tip of the writing unit, and to improve the writing quality of the writing tool.

Further, according to the tenth embodiment , even when the upward writing is performed in a state where the ink in the ink tank is consumed and relatively low, the ink accumulated on the rear end side in the ink tank is written. It can be absorbed by the rear end portion of the portion and gradually guided to the writing tip side of the writing portion by capillary force. As a result, even in the upward writing state when the ink amount is relatively small, the ink discharge amount is appropriate and the writing quality is good.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The writing instrument 1 includes an ink tank 10 that stores ink M therein, a ventilation tail plug 20 that is attached to the rear end side of the ink tank 10 and is permeable to gas, and is attached to the front end of the ink tank 10. The tip 30 and the writing unit 40 are provided, and the ink M in the ink tank 10 is ejected from the writing unit 40.

  The ink tank 10 is formed in a substantially cylindrical shape that constitutes substantially the entire length of the writing instrument 1 so as to be used as a shaft gripped at the time of writing, and a ventilation tail plug 20 described later is fixed to the inner peripheral surface on the rear end side. A writing portion 40 is fitted to the inner peripheral surface of the front end portion reduced in a step shape, and the leading end 30 is fixed to the outer surface of the front end portion so as to penetrate the writing portion 40.

  The ventilation tail plug 20 has a main body portion 21 fixed to the rear end side of the inner peripheral surface of the ink tank 10 by fitting, screwing, or the like, and an integrated first portion superimposed on the rear end surface of the main body portion 21. A ventilation membrane 22 and a first reinforcing ventilation membrane 23; valve means 24 superimposed on the rear end surfaces of the first ventilation membrane 22 and the first reinforcement ventilation membrane 23; It consists of the integral 2nd ventilation film 25 and the 2nd reinforcement ventilation film 26 which were fixed to the front end.

  The main body 21 is integrally formed of a hard synthetic resin material, and is supported by a substantially disk-shaped supported portion 21a that is fixed and supported on the inner peripheral surface on the rear end side of the ink tank 10, and the supported portion 21a. It consists of a ventilation tube 21b arranged on the center side.

  As shown in FIG. 2, the supported portion 21a includes a plurality of through holes 21a1 around the opening 21b1 at the rear end of the ventilation tube 21b.

  The ventilation tube 21b has a peripheral wall on one end connected to the supported portion 21a, and the other end extended forward in the ink tank 10 in the axial direction. The ventilation tube 21b is formed longer than the depth H of the ink M, and the opening 21b2 at the foremost end is closed by a second ventilation film 25 and a second reinforcing ventilation film 26 described later.

The first gas permeable membrane 22 and the second gas permeable membrane 25 are formed by subjecting a porous semipermeable membrane to a water / oil repellent treatment.
Particularly preferably, a porous film of PTFE (polytetrafluoroethylene) is used as the semipermeable membrane, and this porous film is capable of transmitting gas inside and outside the ink tank 10 and preventing the ink M from passing therethrough. The porosity, pore diameter, etc. are adjusted.

The water / oil repellent treatment is a treatment in which a water / oil repellent treatment agent is coated on at least the surface of the semipermeable membrane that comes into contact with ink by means of impregnation, application, spraying or the like. As the water-repellent initial treatment agent, specifically, various fluorine-containing polymers can be used, for example, a polymer having a perfluoroalkyl group is used.
Then, the water / oil repellent treatment provides sufficient water / oil repellency for the ink M, and the coating amount of the water / oil repellent treatment is such that the air permeability of the semipermeable membrane is not impaired. Is adjusted accordingly.

The first reinforced air permeable membrane 23 and the second reinforced air permeable membrane 26 are so-called nonwoven fabrics, and the first reinforced air permeable membrane 23 is bonded to the rear end surface of the first air permeable membrane 22. Is bonded to the rear end face of the second gas permeable membrane 25.
The integrated first gas permeable membrane 22 and the first reinforcing gas permeable membrane 23 are formed in a substantially circular shape following the outer diameter of the supported portion 21a in the main body portion 21, and a plurality of penetrations in the rear end surface of the supported portion 21a. The hole 21a1 and the opening 21b1 of the ventilation tube 21b are bonded so as to be closed.
In addition, the 1st ventilation film 22 and the 1st reinforcement ventilation film 23 may be formed in the planar view substantially cyclic | annular form so that only the some through-hole 21a1 may be closed.

  The integral second gas permeable membrane 25 and the second reinforced gas permeable membrane 26 are formed in a substantially circular shape following the outer diameter of the gas permeable tube body 21b in the main body 21, and the opening portion at the front end of the gas permeable tube body 21b. 21b2 is adhered so as to close.

  The first reinforced air permeable membrane 23 and the second reinforced air permeable membrane 26 prevent the first air permeable membrane 22 and the second air permeable membrane 25 from being deformed, and the air permeability of the first air permeable membrane 22 and the second air permeable membrane 25 is improved. The configuration is not limited to the above-described mode as long as the configuration is not impaired. For example, a mode in which a large number of air holes are provided in a film made of a hard synthetic resin can be used.

The valve means 24 is formed in a substantially circular shape and is provided with a cut 24a penetrating in the thickness direction thereof, with its entire outer peripheral surface being in close contact with the inner peripheral surface of the rear end side of the ink tank 10, It is fixed by fixing means such as welding or fitting.
In the normal state, the material of the valve means 24 closes the cut 24a so as not to allow ventilation, and when the pressure in the ink tank 10 exceeds a predetermined value, the valve means 24 is deformed outward so that the cut 24a can be vented. Any one may be used, and according to a preferred example of the present embodiment, an elastic plate-like body such as rubber is used.

  When the pressure rise in the ink tank 10 is relatively large due to a temperature rise or the like, the valve means 24 is deformed outward to discharge the gas in the ink tank 10 to the outside. When the pressure increase in the ink tank 10 is relatively small due to the volatilization of the ink M, the material and the thickness thereof are set so as to prevent the gas in the ink tank 10 from flowing out to the outside with almost no deformation. The dimensions are adjusted.

It should be noted that the cut 24a only needs to be configured so that it normally closes in a non-ventable manner and forms a gap that allows ventilation when deformed. According to a preferred example of the illustrated example, it is formed in a cross shape. It is also possible to use a shape such as a radial shape or a fine pore shape.
Further, the valve means 24 can be replaced with a mechanism for opening and closing the valve body with respect to the valve seat or another valve mechanism.

Further, the front opening 30 is formed in a substantially tapered shape, and a writing portion 40 described later is inserted through the axial center side thereof, and is fixed to the front end of the ink tank 10 by screwing or fitting.
In addition, an ink storage groove (not shown) for storing the ink M when the ink M is excessively supplied to the writing unit 40 is formed on the peripheral wall of the tip 30 as necessary. The

The writing unit 40 is integrally formed of an ink absorption unit 41 disposed inside the ink tank 10 and an ink discharge unit 42 connected to the front end of the ink absorption unit 41.
Each of the ink absorbing portion 41 and the ink discharging portion 42 is configured by bundling a large number of fiber members so as to guide the ink in the ink tank 10 to the front end side. The many fiber members of the ink absorbing portion 41 are configured with a higher density than the many fiber members of the ink discharge portion 42.
Therefore, according to the writing unit 40 having the above-described configuration, even when the ink M is excessively supplied to the writing unit 40, for example, when the pressure in the ink tank 10 increases, While being suppressed and circulated by the high density ink absorbing portion 41, it can be gradually led to the low density ink discharging portion 42.
Further, when the ink tank 10 is depressurized due to the consumption of the ink M from the front end of the ink discharge unit 42, the writing unit 40 absorbs external air from the front end side of the ink discharge unit 42 and absorbs the air. It acts to be guided into the ink tank 10 through the ink absorbing portion 41.

  The ink tank 10 in the writing instrument 1 having the above configuration is filled with a predetermined amount of ink M, and the space above the ink M is filled with gas such as air or inert gas.

The ink M is not particularly limited, but in order to effectively prevent the ink M from passing through the first gas permeable film 22 and the second gas permeable film 25, an aqueous ink containing a surfactant or an organic solvent is included. It is preferable to use oil based ink.
Examples of the surfactant used in the water-based ink include an anionic surfactant (carboxylic acid type, sulfuric ester type, sulfone type, phosphoric ester type), nonionic active agent (ether type, ester type, amino ether type, alkyl). Amide type) and other fluorine-based activators, silicone-based activators, and reactive activators are used.
Examples of the organic solvent for the oil-based ink include alcohols such as ethyl alcohol, isopropyl alcohol, n-propyl alcohol, and benzyl alcohol, ketones such as methyl ethyl ketone and methyl isobutyl ketone, ethyl acetate, and n-propyl acetate. In addition, esters such as n-butyl acetate, petroleum fractions such as petroleum benzine and ligroin, and aromatic hydrocarbons such as xylene and toluene are used.

  In addition, a cap (not shown) is detachably attached to the front end side of the writing instrument 1 so as to cover the tip 30 and the writing unit 40, thereby preventing the ink M from drying from the writing unit 40. Yes.

Next, the effect of the writing instrument 1 having the above configuration will be described in detail.
As shown in FIG. 1A, in the state where the writing unit 40 faces downward, even if the pressure in the ink tank 10 suddenly rises due to the influence of a temperature rise or the like, the ink tank 10 is more than the ink M in the ink tank 10. The gas on the rear side can be discharged to the outside through the first gas permeable membrane 22, the first reinforcing gas permeable membrane 23, and the cut 24 a of the valve means 24, and the pressure increase in the ink tank 10 can be suppressed.

  In addition, as shown in FIG. 1B, when the writing unit 40 is facing upward, the second gas permeable membrane 25 and the second reinforcing gas permeable membrane 26 touch the gas layer that has moved upward in the ink tank 10. Even if the pressure in the ink tank 10 suddenly rises due to an increase in temperature or the like, the second gas permeable membrane 25 and the second reinforcing gas permeable membrane 26, the inside of the ventilation tube 21b, the first gas permeable membrane 22 and the first gas permeable membrane The gas in the ink tank 10 can be discharged to the outside through the reinforcing air-permeable membrane 23 and the cut 24a of the valve means 24, and the pressure increase in the ink tank can be suppressed.

  Next, another example of the writing instrument of the present invention will be described. In addition, in the other examples of the writing instrument shown below, about the structure substantially the same as the said writing instrument 1, the code | symbol same as the said writing instrument 1 is used, and the detailed description which overlaps is abbreviate | omitted.

  In the writing instrument 2 shown in FIG. 4, the second ventilation film 25 and the second reinforcing ventilation film 26 in the writing instrument 1 described above are replaced with a ventilation part 27 integral with the ventilation tube 21b, and the valve means 24 is replaced with a flexible film. The body 28 is replaced.

The ventilation portion 27 is formed integrally with the ventilation tube body 21b by forming the front end portion of the ventilation tube body 21b in a substantially bottomed cylindrical shape, and has a through portion 27a at the center thereof.
The through portion 27a may be a through hole formed in an opening area that allows passage of gas and prevents the passage of ink M. According to a preferred example illustrated, the through portion 27a has a width of 0.1 to 0.2 mm. The slit-shaped through hole.

The flexible membrane 28 is a membrane provided so as to seal the space S outside the first gas permeable membrane 22 and the first reinforcing gas permeable membrane 23, and the gas pressure in the space S increases. According to a preferred example of the present embodiment, the film body is made of an elastic material such as rubber.
When the pressure increase in the ink tank 10 is relatively large due to a temperature rise or the like, the material, thickness dimension, and the like of the flexible film body 28 are deformed outwardly so that the inside of the ink tank 10 When the pressure increase of the gas is suppressed and the pressure increase in the ink tank 10 is relatively small due to the volatilization of the ink M or the like, the gas in the ink tank 10 flows out to the outside with almost no deformation. It is adjusted appropriately to prevent this.

  According to the writing instrument 2 configured as described above, when the writing unit 40 is facing downward as shown in FIG. 4A, even if the pressure in the ink tank 10 suddenly rises due to the influence of temperature rise or the like, The gas behind the ink M in the tank 10 is passed through the first gas permeable membrane 22 and the first reinforced gas permeable membrane 23 to the space S behind the first gas permeable membrane 22 and the first reinforced gas permeable membrane 23. Since the discharged gas is discharged and the discharged gas is stored in the space S by deformation of the flexible film body 28, an increase in pressure in the ink tank 10 can be suppressed.

When the inside of the ink tank 10 is depressurized due to consumption of the ink M from the writing unit 40, the flexible film body 28 is elastically restored, so that the gas in the space S becomes the first ventilation film. 22 and the first reinforcing gas permeable membrane 23 and returned to the ink tank 10.
In the downward state described above, the ink M outside the ventilation tube 21b may enter the ventilation tube 21b through the penetrating portion 27a, but the intrusion may be caused by the viscosity or surface tension of the ink M. Since it is blocked by such actions, the amount is slight and there is almost no adverse effect on the above-mentioned action effects. Furthermore, even if the ink M enters the ventilation tube 21 b, the outflow of the ink M to the outside is blocked by the first ventilation film 22.

Further, as shown in FIG. 4B, in the state where the writing unit 40 is directed upward, the ventilation unit 27 touches the gas layer that has moved upward in the ink tank 10, so that it is affected by an increase in temperature or the like. Even in the case where the pressure in the ink tank 10 suddenly increases, the ink tank 10 can be passed through the penetrating portion 27a of the ventilation portion 27, the ventilation tube 21b, the first ventilation membrane 22 and the first reinforcing ventilation membrane 23. Gas is discharged into the space S on the rear side of the first gas permeable membrane 22 and the first reinforcing gas permeable membrane 23, and the flexible film body 28 acts in substantially the same manner as in the above-described downward state. The pressure rise is suppressed.
In the upward state, the ventilation portion 27 is hardly in contact with the ink M. However, the ink M is temporarily attached to the ventilation portion 27, and the attached ink M passes through the penetration portion 27a and enters the ventilation portion 27. Even if the ink M penetrates into the ink, the amount of the ink M that has entered the ink is small, so that there is almost no adverse effect on the above-described effect.

  According to the writing instrument 1 and the writing instrument 2 configured as described above, the valve means 24 and the flexible film body 28 are provided as means for preventing the ink M from being volatilized and discharged to the outside. As another example, the valve means is provided by the fiber structure of the first reinforced air permeable membrane 23 and the second reinforced air permeable membrane 26, and the valve means 24 and the flexible membrane body 28 are omitted from the above configuration. Is also possible.

  The writing instrument 3 shown in FIG. 6 is attached to the ink tank 50 that stores the ink M, the bottomed cylindrical outer cylinder 60 that contains the ink tank 50, and the front end side of the ink tank 60. The ink in the ink tank 50 is provided with a writing part 70 exposed forward of the outer cylinder 60 and a cap 80 detachably mounted on the outer peripheral surface of the front end of the outer cylinder 60 so as to cover the writing part 70. It is comprised so that M may be discharged from the writing part 70. FIG.

The ink tank 50 has a substantially cylindrical shape with openings at the front and rear ends, and the opening at the rear end is closed by an integrated first ventilation film 51 and a first reinforcing ventilation film 52. Gas permeation is enabled by the first reinforcing gas-permeable membrane 52.
In addition, the ink tank 50 is fitted with the writing part 70 on the front end side of the inner peripheral surface thereof, and the integral second gas permeable membrane 53 and second reinforcing gas permeable film 54 are fixed around the writing part 70. The second gas permeable membrane 53 and the second reinforced gas permeable membrane 54 also allow gas permeation.
A plurality of ribs 50a (see FIG. 7) are partially provided on the outer peripheral surface of the ink tank 50 in the circumferential direction, and an inner peripheral surface of an outer cylinder 60 described later is supported at the protruding ends of the ribs 50a. The fitting is fixed.

The first gas permeable membrane 51 and the first reinforced gas permeable membrane 52, and the second gas permeable membrane 53 and the second reinforced gas permeable membrane 54 are substantially the same as the first gas permeable membranes 22 and 25 and the first reinforced gas permeable membranes 23 and 26 described above. A semipermeable membrane that has been subjected to water / oil repellent treatment and a non-woven fabric are laminated and bonded together.
The first gas permeable membrane 51 and the first reinforcing gas permeable membrane 52 have a substantially disk shape and are fixed so as to seal the opening at the rear end of the ink tank 50.
The second gas permeable membrane 53 and the second reinforced gas permeable membrane 54 have a substantially annular shape in plan view and are arranged so as not to be exposed to the outside, and in the axial direction between the outer peripheral surface of the writing unit 70 and the inner peripheral surface of the ink tank 50 . It is fixed so as to block the through passage (first ventilation passage) .

The outer cylinder 60 is formed in a substantially bottomed cylindrical shape that covers the ink tank 50 from the rear side in the axial direction.
The outer cylinder 60 has an outer periphery of the ink tank 50 in a state in which a gap is secured between the bottom surface and the first reinforcing gas permeable membrane 52 and between the inner peripheral surface of the outer cylinder 60 and the outer peripheral surface of the ink tank 50. By being supported by the rib 50a, the air passage P (second air passage) that communicates the gap with the first air-permeable membrane 51 and the first reinforcing air-permeable membrane 52 and the front end opening 60a of the outer cylinder 60. It is said.

The writing unit 70 is configured by bundling a large number of fiber members, the rear end side thereof is disposed in the ink tank 50, and the front end side thereof is exposed forward from the front ends of the ink tank 50 and the outer cylinder 60. In this state, it is fitted and fixed by a rib (not shown) on the inner peripheral surface of the ink tank 50.
In addition, according to the illustrated example, the writing unit 70 is an example of a single member. However, substantially the same as the writing unit 40, the rear end side is configured by a relatively high-density ink absorbing unit. In addition, the front end side may be configured by a relatively low-density ink ejection unit.

The cap 80 has a substantially bottomed cylindrical shape, and covers and seals the front end opening 60a of the outer cylinder 60, the second reinforcing ventilation film 54, the writing part 70, etc. The entire surface is in close contact with the surface.

According to the writing instrument 3 having the above configuration, when the pressure of the gas in the ink tank 50 rises due to the influence of temperature rise or the like when the writing unit 70 is facing downward as shown in FIG. The ink is discharged to the outside of the ink tank 50 through the first gas permeable membrane 51 and the first reinforcing gas permeable membrane 52, and further discharged through the air passage P to the outside from the front end opening 60 a on the front end side of the outer cylinder 60.
Further, as shown in FIG. 6B, in the state where the writing unit 70 is facing upward, when the pressure of the gas in the ink tank 50 increases due to an increase in temperature or the like, the gas flows into the second gas permeable membrane 53 and the The ink is discharged to the outside of the ink tank 50 through the two reinforced ventilation films 54.
The ink M in the ink tank 50 does not pass through the first gas permeable membrane 51 and the second gas permeable membrane 53, and therefore does not leak to the outside.
When the cap 80 is attached, the first gas permeable membrane 51 and the first reinforced gas permeable membrane 52, the second gas permeable membrane 53 and the second reinforced gas permeable membrane 54, the writing portion 70, and the like are separated from the outer cylinder 60 and the cap 80. Since it is located in the sealed space formed, volatilization of the ink M in the ink tank 50 is suppressed.

Moreover, the writing instrument 4 shown in FIG. 7 has a configuration in which the writing unit 70 of the writing instrument 3 is replaced with a writing unit 70 ′.
The writing unit 70 ′ has a configuration in which the rear end of the writing unit 70 in the writing instrument 3 is extended to the vicinity of the rear end of the ink tank 50.
In addition, as another example of the writing unit 70 ′, a large number of fiber members inside the ink tank 50 are configured with a higher density than a large number of fiber members on the writing tip side, as in the writing unit 40. The ink M may not be excessively supplied to the leading end side.

  According to the writing instrument 4, the same effect as that of the writing unit 70 described above can be obtained, and even when the upward writing is performed in a state where the ink M in the ink tank 50 is consumed and relatively small, the ink writing is performed. The ink M collected on the rear end side in the tank 50 can be absorbed by the rear end side of the long writing portion 70 and guided to the writing front end side of the writing portion 70 by capillary force.

It is a longitudinal cross-sectional view which shows an example of the writing instrument concerning this invention, (a) shows the state in which a writing part is facing down, (b) shows the state in which a writing part is facing up. It is the (II)-(II) sectional view taken on the line in FIG. It is a rear end elevation of the writing instrument. It is a longitudinal cross-sectional view which shows the other examples of the writing instrument concerning this invention, (a) shows the state in which a writing part is facing down, (b) shows the state in which a writing part is facing up. It is the (VI)-(VI) sectional view taken on the line in FIG. It is a longitudinal cross-sectional view which shows the other examples of the writing instrument concerning this invention, (a) shows the state in which a writing part is facing down, (b) shows the state in which a writing part is facing up. It is the (VII)-(VII) sectional view taken on the line in FIG. It is a longitudinal cross-sectional view which shows the other examples of the writing instrument concerning this invention, (a) shows the state in which a writing part is facing down, (b) shows the state in which a writing part is facing up.

1, 2, 3, 4: Writing instrument 10, 50: Ink tank 20: Ventilation tail plug 21b: Venting tube 22, 51: First ventilation membrane 23, 52: First reinforcing ventilation membrane 24: Valve means 25, 53 : Second gas permeable membrane 26, 54: second reinforcing gas permeable membrane 27a: penetrating portion 28: flexible membrane bodies 40, 70, 70 ': writing portion 80: cap M: ink

Claims (6)

A writing instrument that causes ink in an ink tank to be ejected from a writing unit, and a writing instrument that includes a gas permeable membrane that allows gas to permeate into and out of the ink tank.
This gas permeable membrane is formed by performing water and oil repellency treatment on a semipermeable membrane that is permeable to gas and prevents ink from passing through.
On the entire outer surface of the gas permeable membrane, a reinforced gas permeable membrane is overlapped without any gap so as to prevent deformation of the gas permeable membrane without impairing the gas permeable property of the gas permeable membrane, and on the rear end surface of the reinforced gas permeable membrane, When the pressure in the ink tank rises above a predetermined value, the valve means that discharges the internal gas is overlaid ,
The valve means is provided with a slit penetrating in the thickness direction in the elastic plate-like body, and when the pressure in the ink tank becomes equal to or higher than a predetermined value in a normal state, the slit is closed so as not to be ventilated. The writing instrument is characterized in that it is deformed outward to allow the cut to be vented.   2. The writing instrument according to claim 1, wherein the cut is formed in a cross shape. A writing instrument that causes ink in an ink tank to be ejected from a writing unit, and a writing instrument that includes a gas permeable membrane that allows gas to permeate into and out of the ink tank.
This gas permeable membrane is formed by performing water and oil repellency treatment on a semipermeable membrane that is permeable to gas and prevents ink from passing through.
Two gas-permeable membranes are provided, one of which is a first gas-permeable membrane and the other is a second gas-permeable membrane, and a ventilation tube longer than the depth of ink stored in the ink tank extends in the axial direction. Provided
The first gas permeable membrane is disposed as an outer wall on the rear end side of the ink tank,
The second gas permeable membrane is disposed in the ink tank so as to close an opening on the front end side of the gas permeable tube,
The writing tube according to claim 1, wherein a rear end of the ventilation tube is connected to an outer wall on a rear end side of the ink tank, and an opening of the rear end is directed to the outside . A writing instrument that causes ink in an ink tank to be ejected from a writing unit, and a writing instrument that includes a gas permeable membrane that allows gas to permeate into and out of the ink tank.
This gas permeable membrane is formed by performing water and oil repellency treatment on a semipermeable membrane that is permeable to gas and prevents ink from passing through.
A writing instrument, wherein a space outside the gas permeable membrane is sealed with a flexible membrane . A writing instrument that causes ink in an ink tank to be ejected from a writing unit, and a writing instrument that includes a gas permeable membrane that allows gas to permeate into and out of the ink tank.
This gas permeable membrane is formed by performing water and oil repellency treatment on a semipermeable membrane that is permeable to gas and prevents ink from passing through.
In the ink tank, a substantially bottomed tubular ventilation tube with the bottom facing forward, a ventilation tube longer than the depth of the stored ink is provided across the axial direction,
The ventilation tube has a through-hole at the bottom on the front end side thereof, which is set to have an opening area that allows the passage of gas and prevents the passage of ink, and the ventilation tube has a rear end. Is connected to the outer wall on the rear end side of the ink tank, and the opening at the rear end is directed outward.
The air-permeable film is disposed as an outer wall on the rear end side of the ink tank, and covers the opening at the rear end of the ventilation tube . A writing instrument that causes ink in an ink tank to be ejected from a writing unit, and a writing instrument that includes a gas permeable membrane that allows gas to permeate into and out of the ink tank.
This gas permeable membrane is formed by performing water and oil repellency treatment on a semipermeable membrane that is permeable to gas and prevents ink from passing through.
Two of the gas permeable membranes, one of which is a first gas permeable membrane and the other is a second gas permeable membrane,
The first gas permeable membrane is disposed as an outer wall on the rear end side of the ink tank, and the second gas permeable membrane is disposed as an outer wall on the front end side of the ink tank,
The ink tank is fixed to the inside of the bottomed cylindrical outer cylinder, and the writing part is mounted on the front end side in the ink tank, and the front end side part of the writing part is attached to the ink tank and the outer cylinder. A writing instrument that is exposed forward,
A second reinforcing gas permeable film overlaid on the outside of the second gas permeable film and the second gas permeable film between the outer peripheral surface of the writing part and the inner peripheral surface of the front end side of the ink tank; Providing a first air passage communicating with the front end opening and opened to the outside;
While communicating between the outer cylinder and the ink tank, the first ventilation film and the first reinforcing ventilation film superimposed on the outside of the first ventilation film, and the front end opening of the outer cylinder, Providing a second air passage that is open to the outside without passing through the first air passage;
A writing instrument , wherein the front end opening of the outer cylinder, the front end opening of the ink tank, and the writing part are sealed with a removable cap .

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