JP2022025519A - Liquid discharge tool - Google Patents

Abstract

To provide a liquid discharge tool with a structure in which the pressure applied to a liquid can be adjusted and the pressure is not easily affected by changes in the remaining amount of a liquid in a liquid storing tube.SOLUTION: A cap 8 includes a cap body 81 and a contact body 82 provided with an operation portion 82a that can be moved in a direction along an axis and can be operated from the outside of the cap 8. When the cap 8 is attached to the rear of a discharge tool body 2, an inner peripheral surface of the cap body 81 on an opening end 8a side advances while sliding in contact with an outer peripheral surface of the discharge tool body 2 until a rear end 2a of the discharge tool body 2 abuts on the contact body 82 of the cap 8. Thereby, a liquid 6 in a liquid storing tube 5a is pressurized through the compressed air in a closed space MK composed of a first space portion K1, a second space portion K2, and a gas storage portion K3.SELECTED DRAWING: Figure 4

Description

The present invention relates to a liquid ejector.

Conventionally, it has been known that a writing tool such as a ballpoint pen or a marker, a pen-shaped correction fluid, or a coating tool such as a liquid glue, which causes a liquid to flow out from a tip tip provided in front of the shaft body, and is further pressurized. Structures that can increase the amount of liquid outflow are also known.
For example, in a writing tool, as in Patent Document 1 (Japanese Unexamined Patent Publication No. 2000-335173), a pressurizing mechanism is provided behind the ink accommodating tube, and the ink in the ink tank is pressurized in conjunction with the pressing operation of the knock body. There is a structure that can be done. With a writing instrument provided with such a pressurizing mechanism, it is possible to increase the amount of ink flowing out from the pen tip and make the handwriting thicker or darker.

Japanese Unexamined Patent Publication No. 2000-335173

However, the writing tool of Patent Document 1 requires a pressurizing mechanism for pressurizing, and the structure becomes complicated, so that the risk of failure increases and the cost increases. Further, the ballpoint pen of Patent Document 1 has a structure in which the ink is pressed in conjunction with the extrusion operation of the knock mechanism, so that the pressure amount cannot be adjusted. Even if it is not necessary, the ink is constantly pressurized.
In addition, since the structure allows compression by the pressurizing mechanism only for the air in the space behind the refill (liquid storage tube) that contains the ink, the ink (liquid) in the refill is unused and the refill can be compressed. Compared to the compressive force when the amount of air in the rear space is small, the compressive force when the ink is reduced and the amount of air in the rear space of the refill is large becomes smaller, and as a result, the amount of air in the rear space of the refill is small. When the ballpoint pen, which easily compresses air, starts to be used, a large amount of ink is ejected, the ink is consumed and the amount of air in the space behind the refill increases, and when the air becomes difficult to compress, the amount of ink ejected decreases. The structure is such that the ejection amount of the ink is easily affected by the remaining amount of ink.

An object of the present invention is to obtain a liquid ejector having a structure capable of adjusting the pressing force on a liquid and having a structure in which the pressing force is not easily affected by a change in the remaining amount of the liquid in the liquid accommodating pipe.

The present invention
"1. It is provided with a cylindrical discharge tool main body and a cap that can be attached to and detached from the front and rear of the discharge tool main body and has one end open and the other end closed.
A liquid discharger that discharges the liquid contained in the discharger body from a tip tip provided in front of the discharger body.
A liquid accommodating pipe for accommodating the liquid is provided inside the ejector main body.
A first space portion located behind the liquid contained in the liquid storage pipe is provided at the rear portion of the liquid storage pipe.
A second space portion communicating with the first space portion is provided between the discharge tool main body and the liquid storage pipe.
The ejection tool main body has a hole portion for communicating the outside of the ejection tool main body and the second space portion.
The cap has a cap body and a contact body provided with an operating portion that is movable in a direction along the axis and can be operated from the outside of the cap.
When the cap is attached to the rear of the discharge tool body, the inner peripheral surface of the cap body on the open end side is the discharge tool body until the rear end of the discharge tool body comes into contact with the contact body of the cap. By advancing while sliding on the outer peripheral surface,
A gas accommodating portion communicating with the second space portion is formed between the cap main body and the ejection tool main body through the hole portion, and the first space portion, the second space portion, and the gas accommodating portion are formed. A liquid discharger having a structure in which the liquid in the liquid storage tube is pressurized through the compressed air in the closed space composed of the above.
2. 2. The liquid discharger according to the above item 1.
The cap body has a spiral groove on the top surface, and the contact body has a spiral protrusion on the side surface that is locked to the spiral groove, and the operation portion of the contact body. A liquid ejector having a structure in which the abutting body moves back and forth by rotating the contact body.
3. 3. The liquid ejector according to the above item 2,
A liquid ejector having a structure in which the abutting body includes a main body and a sliding body that slides on the inner peripheral surface of the cap body in the front-rear direction, and the main body is rotatably connected to the sliding body. ".

In the liquid discharge tool of the present invention, when the cap is attached to the rear of the discharge tool main body, the inner peripheral surface on the opening end side of the cap body advances while sliding in contact with the outer peripheral surface of the discharge tool main body, thereby advancing in the closed space. It is a structure that pressurizes the liquid in the liquid storage pipe through the compressed air of the above, and is a structure that makes it easy to discharge the liquid by pressurizing the compressed air so that the pressure becomes higher than the atmospheric pressure.

In addition, by operating the operation part of the contact body to increase the length of the contact body entering the inside of the cap body, when the cap is attached to the rear of the discharge tool body, the rear of the discharge tool body is used. The distance until the end abuts on the contact body of the cap is shortened, and the amount of advancement of the inner peripheral surface on the open end side of the cap body while sliding in contact with the outer peripheral surface of the discharge tool body is shortened. The structure is such that the liquid can be weakly pressurized. When attaching the cap, it is only necessary to attach it until the rear end of the ejector body abuts on the contact body of the cap, so the liquid does not have to be a concern for the user when attaching the cap. Can be pressed weakly.
On the contrary, by operating the operation part of the contact body to shorten the length of the contact body entering the inside of the cap body, when the cap is attached to the rear of the discharge tool body, the discharge tool body When the distance until the rear end abuts on the contact body of the cap is lengthened, the amount of advancement of the inner peripheral surface on the open end side of the cap body while sliding against the outer peripheral surface of the discharge tool body becomes long, and the liquid The structure is such that the liquid in the accommodation tube can be strongly pressurized. As described above, when attaching the cap, it is only necessary to attach it until the rear end of the ejection tool body abuts on the contact body of the cap, so the user is concerned about the attachment distance when attaching the cap. The liquid can be strongly pressurized without any need.
As described above, in the liquid discharge tool of the present invention, by operating the operation unit that can be operated from the outside of the cap, when the cap is attached to the rear of the discharge tool main body, the rear end of the discharge tool main body is in contact with the cap. The structure is such that the distance to contact with the contact body is changed, and as a result, the amount of air compressed in the closed space is changed, and the pressing force on the liquid in the liquid storage tube can be changed in advance. By setting the length at which the abutting body enters the inside of the cap body at the operation unit, the liquid according to the setting can be set without worrying about the mounting distance when the user attaches the cap. It is possible to perform constant pressurization.

Further, since the liquid ejector in the structure of the present invention compresses the air in the closed space composed of the first space portion, the second space portion and the gas accommodating portion, it is possible to pressurize a large volume of air. Even if the amount of liquid in the liquid storage pipe decreases and the amount of air in the liquid storage pipe increases, the pressure is unlikely to change, and as a result, the discharge amount of the liquid can be stabilized.

Further, when the cap is attached to the rear of the discharge tool body, at least the outer peripheral surface of the discharge tool body is displaced in the axial radial direction so that the inner peripheral surface of the cap body is in close contact with the outer peripheral surface of the discharge tool body. It can be advanced while being moved, and the air in the enclosed space can be efficiently compressed.
In this case, as the material of the ejection tool main body, the entire ejection tool main body or only the surface thereof may be molded with a soft resin such as polypropylene resin, polyethylene resin, ABS resin, or olefin-based thermoplastic elastomer, styrene-based thermoplastic elastomer, polyester. It can be molded with a thermoplastic elastomer, a polyurethane thermoplastic elastomer, or the like. Further, by forming the ejector main body with a thin wall thickness, it is also possible to press at least the outer peripheral surface of the ejector main body with the inner peripheral surface of the cap main body to deform it.
The material of the cap body may be molded from a hard resin such as polycarbonate resin, acrylic resin, or AS resin in order to displace the ejector body in the axial radial direction on the inner peripheral surface of the cap.

Further, a portion in which the inner peripheral surface of the cap and the outer peripheral surface of the ejection tool body are brought into close contact with each other by providing an annular convex portion that is in sliding contact with the outer peripheral surface of the ejection tool main body on the inner peripheral surface on the opening end side of the cap. Can be specified, and airtightness can be taken efficiently. The annular convex portion provided on the opening end side of the cap may be integrally molded with the cap, or an O-ring or the like may be fixedly provided on the inner surface of the cap.

Further, when the cap is attached at a position in front of the rear end of the liquid accommodating portion of the discharge tool main body and behind the discharge tool main body and the compression of air in the closed space is started, the circle of the cap is formed. By providing a hole for communicating the outside of the discharge tool main body and the second space portion at a position behind the annular convex portion, the liquid can be discharged even if the liquid leaks from the rear end portion of the liquid storage portion. It is easy to flow toward the inside of the rear part of the main body, and it is difficult for the liquid to leak to the outside of the discharger main body.

Further, a spiral groove portion is provided on the top surface of the cap, a spiral protrusion portion locked to the spiral groove portion is provided on the side surface of the contact body, and the operation portion of the contact body is rotated. By adopting a structure in which the abutment body is moved back and forth, it is easy to finely adjust the length of the abutment body that enters the inside of the cap body by operating the operation portion of the abutment body. The spiral groove of the cap can be formed with a female screw, and the spiral protrusion of the abutting body can be formed with a male screw.

Further, the abutting body includes a main body and a sliding body that slides on the inner peripheral surface of the cap main body in the front-rear direction, and the main body is rotatably connected to the sliding body to form a structure with the cap. The gas accommodating portion formed between the discharger body and the cap body is partitioned by a sliding body that is in close contact with the inner peripheral surface of the cap body, and the spiral groove portion on the top surface of the cap and the spiral protrusion on the side surface of the contact body. Even if a gap is formed in the engagement with the portion, the sliding body is in close contact with the inner peripheral surface of the cap body, so that the first space portion, the second space portion, and the gas accommodating portion form a closed space. Can be done.
In this case, the sliding body is molded with a soft resin such as polypropylene resin, polyethylene resin, ABS resin, or molded with an olefin-based thermoplastic elastomer, a styrene-based thermoplastic elastomer, a polyester-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, or the like. By doing so, the outer peripheral surface of the sliding body may be slightly larger than the inner peripheral surface of the cap body, and the outer peripheral surface of the sliding body may be brought into contact with the inner peripheral surface of the cap body to be slightly compressed and deformed. Even when the sliding body is molded from an elastomer having a high frictional resistance on the outer peripheral surface, the main body is rotatably connected to the sliding body, so that the sliding body is rotated with respect to the inner peripheral surface of the cap body. It can move back and forth without any problem, and has excellent operability.

The shape of the ejector body is not particularly limited, but a rod-shaped form such as a writing instrument is preferable so that the ejector body can be easily gripped.

Examples of the tip tip include a ballpoint pen tip, a felt tip, a pen body of a fountain pen equipped with a brush tip and a pen core, and the like in the case of a writing instrument, and a fiber convergent, a sponge, and the like in the case of a coating tool. Since the tip tip is the final path for discharging the liquid in the liquid storage pipe to the outside, the size of the liquid flow path and the presence or absence of the valve mechanism are in contact with the rear end of the liquid stored in the liquid storage pipe. It is related to the pressurized state of the air. For example, if the liquid flow path is large, the liquid can be easily discharged even if the pressure is slightly higher than the atmospheric pressure. By providing a valve mechanism on the tip, even if the air in the closed space consisting of the gas accommodating part, the first space part, and the second space part is greatly compressed, the liquid is unintentionally discharged. Can be prevented.

When the atmospheric pressure is 1000 hPa, for example, in a writing tool ink having a low viscosity (for example, a writing tool ink having a viscosity of 1 mPa · s to 2000 mPa · s in an environment of 20 ° C.), the air in the enclosed space By setting the atmospheric pressure to a pressurized state in which the atmospheric pressure exceeds 1000 hPa, which is the atmospheric pressure, and is in the range of 1500 hPa, it becomes possible to easily eject the ink for writing tools. Ink for writing tools having a viscosity of 3000 mPa · s to 50,000 mPa · s), the pressure of the air in the enclosed space is set to a pressurized state in the range of 1100 hPa to 5000 hPa to facilitate the ejection of the writing ink. Will be able to. However, the numerical value to be pressurized is not particularly limited, and as described above, it may be appropriately set depending on the characteristics such as the viscosity of the liquid and the structure of the tip.

The liquid is not particularly limited as long as it can be stored in the liquid storage tube, and may be appropriately selected depending on the use of the liquid ejection tool such as writing ink, correction fluid, liquid glue, and cosmetic liquid. The writing ink is not particularly limited to oil-based ink and water-based ink, and ink having shear thinning property can also be used.
Further, a heat-color-changing ink using a microcapsule pigment containing a heat-coloring material as a colorant contains a coloring material in the capsule, so that it is generally difficult to increase the handwriting density. By using a liquid ejector having a structure, it is possible to increase the handwriting density by increasing the amount of ink outflow due to pressurization.
As a method for increasing the brush stroke concentration of the heat-discolorable ink containing the microcapsule pigment, there are cases where the amount of the microcapsule pigment as a colorant is increased or the particle size of the microcapsule pigment is increased. When the amount of the microcapsule pigment is increased, the viscosity of the ink becomes high and it becomes difficult for the ink to flow out, and when the particle size of the microcapsule pigment is increased, the pigment becomes difficult to pass through the ink flow path and the ink. There is a risk that the outflow of ink will be difficult. However, even with such an ink, the liquid ejector having the structure of the present invention can be used because the ink can be forcibly ejected by pressurizing the ink.
Further, even an ink having a relatively high specific gravity solid content such as titanium oxide or a bright pigment in the liquid and having a high viscosity when allowed to stand so that the solid content does not settle in the liquid can be used as a liquid having the structure of the present invention. Similar to the heat-discolorable ink containing the microcapsule pigment, the ejector can forcibly eject the ink by pressurizing the ink.
Further, even when a dry liquid adheres to the tip, such as a correction fluid or liquid glue, the liquid can be pressurized to facilitate discharge.
As described above, the liquid ejector of the present invention has a structure suitable for ejecting various liquids.

According to the present invention, it is possible to adjust the pressing force on the liquid, and it is possible to obtain a liquid ejector having a structure in which the pressing force is not easily affected by the change in the remaining amount of the liquid in the liquid accommodating pipe.

It is a vertical cross-sectional view in the state where the cap of the ballpoint pen of this embodiment is removed, and is the figure which showed a part in the side view. It is a vertical cross-sectional view which shows the state which the cap is attached to the front of the shaft body in the ballpoint pen of this embodiment, and is the figure which showed a part in the side view. It is a conceptual diagram which shows the 1st state which attached the cap to the rear of the shaft body in the ballpoint pen of this embodiment, and is the state which pressurization is started. It is a conceptual diagram in which the cap is advanced from the state of FIG. 3, and is a state in which ink is pressed. It is a conceptual diagram which shows the 2nd state which attached the cap to the rear of the shaft body in the ballpoint pen of this embodiment, and is the state which pressurization is started. It is a conceptual diagram which advanced the cap from the state of FIG. 5, and is the state which the ink was pressed. It is a conceptual diagram which shows the 3rd state which attached the cap to the rear of the shaft body in the ballpoint pen of this embodiment, and is the state which pressurization is started. It is a conceptual diagram which advanced the cap from the state of FIG. 7, and is the state which the ink was pressed.

Next, the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In the present embodiment, a cap-type ballpoint pen will be described as a liquid ejection tool, but the liquid ejection tool having the structure of the present invention is a writing tool such as a marker or a fountain pen, a coating tool such as a correction pen or liquid glue, or a makeup tool. It can be used as a tool.
In the present embodiment, the side with the pen tip is expressed as the front, and the opposite side is expressed as the rear. For the sake of clarity, similar members and similar parts in the drawings are designated by the same reference numerals.

FIG. 1 is a vertical cross-sectional view of the ballpoint pen of the present embodiment with the cap removed, and is a partial side view.
As shown in FIG. 1, the ballpoint pen 1 (liquid discharge tool) of the present embodiment comprises a shaft body 2 (discharge tool main body) composed of a front shaft 3 and a rear shaft 4 screwed onto the front shaft 3. be. A ballpoint pen refill 5 is arranged inside the shaft body 2, the ink 6 (liquid) is housed in the ballpoint pen refill 5, and a grease-like ink follower 7 is placed behind the ink 6. It is housed. The ink follower 7 prevents the ink 6 from flowing out to the rear, and moves forward as the ink 6 decreases.
The ballpoint pen refill 5 has a ballpoint pen tip 5b (tip tip) arranged in front of the ink tank 5a (liquid storage portion) protruding from the front end opening 3a of the front shaft 3 and is formed on the front inner surface of the front shaft 3. It is sandwiched between the reduced diameter portion 3b and the rib 4a formed on the rear inner surface of the rear shaft 4, and is fixed to the shaft body 2.

The gap between the front end opening 3a of the front shaft 3 and the ballpoint pen tip 5b of the ballpoint pen refill 5 is sealed with silicone rubber (not shown). Further, the front shaft 3 and the rear shaft 4 have a press-fitting portion 3d provided in front of the fitting portion 3c of the front shaft 3 and a press-fitting receiving portion 4c provided in front of the fitting receiving portion 4b of the rear shaft 4. It is sealed by press-fitting.
The shaft body 2 is provided with a round hole-shaped hole portion 4d having a diameter of 1 mm and having a center at a position 10 mm forward of the rear end portion 5c of the ink tank 5a on the rear shaft 4.
The rear portion of the ink tank 5a has a first space portion K1 located behind the ink 6 and the ink follower 7 housed in the ink tank 5a, and is located between the shaft body 2 and the ink tank 5a. It has a second space portion K2 that communicates with one space portion K1. The hole 4d communicates the second space K2 with the outside, but even if the ink 6 leaks from the rear end 5c of the ink tank 5a, the hole 4d is in front of the rear end 5c of the ink tank 5a. Since the ink 6 is located at, the ink 6 has a structure that easily flows toward the inside of the rear portion of the rear shaft 4 and does not easily leak to the outside of the shaft body 2.
The rear axle 4 is molded of polypropylene, which is a soft resin, and the cap 8 is molded of polycarbonate, which is a hard resin. Further, both the rear shaft 4 and the cap 8 are molded of a transparent resin so that the inside can be visually recognized.

FIG. 2 is a vertical cross-sectional view showing a state in which the cap is attached to the front of the shaft body, and is a view showing a part of the cap in a side view.
As shown in FIG. 2, a cap 8 is attached to the front shaft 3 so as to protect the ballpoint pen tip 5b. The cap 8 is provided with an annular convex portion 8b on the inner peripheral surface on the opening end 8a side, and the annular convex portion 8b gets over the protrusion 3e formed on the outer peripheral surface of the front shaft 3 to get over the convex portion 3e. Is locked to the shaft body 2.

The cap 8 has a cap main body 81 and a contact body 82 provided with an operation portion 82a that can be moved in a direction along the axis and can be operated from the outside of the cap 8. A main body 821 and a sliding body 822 that slides on the inner peripheral surface of the cap main body 81 in the front-rear direction are provided, and the main body 821 is rotatably connected to the sliding body 822.
The cap 8 of the present embodiment has a female screw portion 811a (spiral groove portion) on the top surface 811 of the cap main body 81, and a male screw portion screwed with the female screw portion 811a on the side surface 821 of the contact body 82. It has a structure having 821a (spiral protrusion), and the contact body 82 moves back and forth by rotating the operation portion 82a of the contact body 82.

Further, the state of the cap 8 shown in FIG. 2 is a state in which the operation portion 82a of the cap 8 in the state of FIG. 1 is rotated and moved until the sliding body 822 comes into contact with the top surface 811 of the cap body 81. By attaching the cap 8 to the front shaft 3 in that state, as described above, the annular convex portion 8b gets over the protrusion 3e formed on the outer peripheral surface of the front shaft 3 so that the cap 8 becomes the shaft body 2. It is locked, and at the same time, the ballpoint pen tip 5b comes into contact with the sliding body 822 formed of the styrene-based thermoplastic elastomer to prevent the ballpoint pen tip 5b from drying.

In the present embodiment, the outer flange portion 82b is provided at the end of the main body 821 of the contact body 82 located on the opposite side of the operation portion 82a, and the outer flange portion 82b is a recess provided in the sliding body 822. It is inserted into the 822a and is in contact with the inner flange portion 822b provided in the recess 822a to prevent it from coming off. Further, the outer diameter of the sliding body 822 molded from the styrene-based thermoplastic elastomer is formed to be slightly larger than the inner diameter of the cap body 81 molded from polycarbonate, and the outer peripheral surface of the sliding body 822 is inside the cap body 81. The sliding body 822 is slightly compressed and deformed in the radial direction by being brought into contact with the peripheral surface so as to be in close contact with each other so that airtightness can be obtained.
When the contact body 82 is moved back and forth by rotating the operation portion 82a, even if the main body 821 of the contact body 82 rotates, the outer flange portion 82b of the main body 821 that rotates together with the operation portion 82a By idling with respect to the recess 822a of the sliding body 822, the influence of the frictional resistance between the outer peripheral surface of the sliding body 822 and the cap body 81 is reduced, and the sliding body 822 can be easily moved back and forth with respect to the cap body 81. There is.
The operation portion 82a is formed to have a diameter larger than the valley diameter of the male screw portion 821a, and when the operation portion 82a is rotated to advance the contact body 82, the operation portion 82a is formed as shown in FIG. Is in contact with the top surface 811 of the cap body 81, so that the advance of the contact body 82 is restricted. A vertical groove is provided on the outer surface of the operation unit 82a so that it can be easily rotated by a finger.

For the ink 6, first, 20.0 parts by mass of the titanium oxide dispersion, 1.0 part by mass of the solvent (ethylene glycol), 40.0 parts by mass of water, and 1.0 part by mass of the dispersant (surfactant) were collected. After sufficient dispersion using a disperser, centrifugation is performed to remove coarse mass to obtain a titanium oxide dispersion. After that, 62.0 parts by mass of the prepared titanium oxide dispersion, 24.4 parts by mass of water, and a resin emulsion (acrylic emulsion) 10. 0 parts by mass, 1.0 part by mass of phosphate ester surfactant, 1.0 part by mass of pH adjuster (triethanolamine), 1.0 part by mass of rust preventive (benzotriazole), 0.2 parts by mass of antifungal agent The mass part was heated and stirred with a magnet hot stirrer to prepare a base ink. Then, while heating the base ink produced above, 0.4 parts by mass of the shear thinning agent (succinoglycan) was added, and the mixture was sufficiently mixed and stirred using a homogenizer stirrer until a uniform state was obtained. Filtration was performed using filter paper to obtain white ink.

Next, a state in which the cap 8 is attached to the rear of the shaft body 2 and the ink 6 is pressed will be described with reference to FIGS. 3 to 8.
FIG. 3 is a conceptual diagram showing a first state in which the cap is attached to the rear of the shaft body of the ballpoint pen of the present embodiment, and is a state in which pressurization is started. FIG. 4 is a conceptual diagram in which the cap is advanced from the state of FIG. 3, and is a state in which the ink is pressurized.
FIG. 5 is a conceptual diagram showing a second state in which the cap is attached to the rear of the shaft body of the ballpoint pen of the present embodiment, and is a state in which pressurization is started. FIG. 6 is a conceptual diagram in which the cap is advanced from the state of FIG. 5, and is a state in which the ink is pressurized.
FIG. 7 is a conceptual diagram showing a third state in which the cap is attached to the rear of the shaft body of the ballpoint pen of the present embodiment, and is a state in which pressurization is started. FIG. 8 is a conceptual diagram in which the cap is advanced from the state of FIG. 7, and is a state in which the ink is pressurized.

The cap 8 in the state shown in FIG. 3 is the state of the cap 8 shown in FIG. 1, and the operating portion 82a abuts on the top surface 811 of the cap body 81 to inward the cap body 81 of the contact body 82. The entry is restricted, and the cap 8 is attached to the shaft body 2, and the annular convex portion 8b of the cap 8 exceeds the hole portion 4d of the rear shaft 4, and the cap body 81 A gas accommodating portion K3 communicating with the second space portion K2 is formed between the shaft body 2 and the shaft body 2 via the hole portion 4d, and is sealed by the first space portion K1, the second space portion K2, and the gas accommodating portion K3. It is a state in which the space MK is configured. In the state of FIG. 3, a distance L1 which is a gap of 5 mm is formed between the sliding body 822 and the rear end of the rear shaft 4.

When the cap 8 is attached to the shaft body 2 from the state shown in FIG. 3 to the state shown in FIG. 4, that is, the state where the rear end 2a of the shaft body 2 abuts on the sliding body 822 of the cap 8, the cap 8 slides. The moving body 822 moves a distance L1 of 5 mm until it comes into contact with the rear end 2a of the shaft body 2, and the annular convex portion 8b of the cap 8 advances while sliding on the outer peripheral surface of the shaft body 2. The air pressure inside the closed space MK composed of the space portion K1, the second space portion K2, and the gas accommodating portion K3 is compressed to 1230 hPa, and the ink 6 in the ink tank 5a is pressurized. ..

Further, the pressing force on the ink 6 changes depending on the amount of the ink 6 contained in the ink tank 5a, and when the ink 6 is large and the first space portion K1 in the ink tank 5a is small, the pressing force is large. When the amount of ink 6 is small and the first space K1 in the ink tank 5a is large, the pressing force tends to be small.
However, in the present embodiment, as described above, the air compressed when the cap 8 is attached to the shaft body 2 is sealed by the first space portion K1, the second space portion K2, and the gas accommodating portion K3. Since it is the entire air inside the space MK, it has a structure that is not easily affected by the first space portion K1 whose volume changes depending on the remaining amount of the ink 6.
Specifically, in the state of FIG. 3 in which the ink 6 in the ink tank 5a is unused, the volume of the first space portion K1 is 100 mm ³ , and although not shown, in the state where the ink 6 is small, the first space portion K1 has a volume of 100 mm 3. The volume of one space portion K1 is 1400 mm ³ , and the rate of change in volume is large. On the other hand, in the state of FIG. 3 in which the ink 6 is unused, the volume of the closed space MK is 2100 mm ³ , and although not shown, in the state where the ink 6 is small, the volume of the closed space MK is 3400 mm ³ . , The rate of volume change is small.
Actually, when the atmospheric pressure is 1000 hPa, the ballpoint pen 1 of the present embodiment shown in FIG. 3 has a shaft body 2 up to the position shown in FIG. 4 with the cap 8 in a state where the ink 6 in the ink tank 5a is unused. When mounted rearward, the air pressure in the closed space MK can be pressurized to 1230 hPa, and the cap 8 is moved to the position shown in FIG. 4 with the ink 6 in the ink tank 5a in a slight state. When mounted rearward, the air pressure in the closed space MK can be pressurized to 1130 hPa, and the amount of pressurization does not change much.

By advancing the cap 8 from the state of FIG. 3 to the state of FIG. 4, the annular convex portion 8b of the cap 8 advances while sliding on the outer peripheral surface of the rear shaft 4, and the first space portion K1 and the second space portion K1 and the second. The air inside the closed space MK composed of the space portion K2 and the gas accommodating portion K3 is compressed, and the ink 6 is pressurized. The rear shaft 4 of the present embodiment is formed in a squeezed shape having a gentle arcuate surface whose diameter is reduced toward the rear end. As a result, when the cap 8 is attached to the rear of the shaft body 2, the cap easily reaches the position where the annular convex portion 8b of the cap 8 first abuts on the outer peripheral surface of the shaft body 2, that is, the position shown in FIG. 8 can be attached.
Further, as described above, since the rear shaft 4 is made of a soft resin, when the cap 8 is mounted behind the shaft body 4, the annular convex portion 8b of the cap 8 is formed on the outer periphery of the rear shaft 4. Since the surface is pressed against the surface and moved forward while being deformed inward, the airtightness of the closed space MK is improved, and even when the cap 8 is moved forward and strongly receives the repulsive force of the air of the compressed closed space MK. Since the contact resistance between the cap 8 and the shaft body 2 is increased, air can be compressed without the cap 8 falling off from the shaft body 2.
Specifically, the inner diameter of the annular convex portion 8b of the cap 8 is 10 mm, and the outer diameter of the rear shaft 4 with which the annular convex portion 8b abuts in FIG. 3 is 10.2 mm. In FIG. 4 in which the air is compressed, the outer diameter of the rear shaft 4 to which the annular convex portion 8b abuts is 10.4 mm, and the annular convex portion 8b is formed from the position of FIG. 3 to the position of FIG. The outer diameter difference of the rear shaft 4 having the shape of the tip narrowed when moving forward is set to 0.2 mm.
The annular convex portion 8b provided on the inner peripheral surface of the cap 8 can be brought into close contact with the outer peripheral surface of the rear shaft 4 to be efficiently airtight after the compression is started, and the annular convex portion can be efficiently airtightened. Since the 8b is formed in a semicircular cross section and abuts only at the innermost diameter of the outer peripheral surface of the rear shaft 4, the annular convex portion 8b gets over the hole 4d and pressurization is started. The change in the situation becomes remarkable when the pressure is released or when the pressure is released.

In the cap 8 in the state shown in FIG. 5, the operating portion 82a is rotated to shorten the length of the contact body 82 entering the inside of the cap body 81, and the cap 8 is used as the shaft body 2. The annular convex portion 8b of the cap 8 is in a state of exceeding the hole portion 4d of the rear shaft 4, and is placed between the cap body 81 and the shaft body 2 via the hole portion 4d. A gas accommodating portion K3 communicating with the space portion K2 is formed, and a closed space MK is formed by the first space portion K1, the second space portion K2, and the gas accommodating portion K3. In the state of FIG. 5, a distance L2, which is a gap of 10 mm, which is twice the distance L1, is formed between the sliding body 822 and the rear end of the rear shaft 4.

When the cap 8 is attached to the shaft body 2 from the state shown in FIG. 5 to the state shown in FIG. 6, that is, until the rear end 2a of the shaft body 2 abuts on the sliding body 822 of the cap 8, the cap 8 is attached. The sliding body 822 moves a distance L2 of 10 mm until it comes into contact with the rear end 2a of the shaft body 2, and the annular convex portion 8b of the cap 8 advances while sliding on the outer peripheral surface of the shaft body 2. The air pressure inside the closed space MK composed of the one space portion K1, the second space portion K2, and the gas accommodating portion K3 is compressed to 1590 hPa, and the ink 6 in the ink tank 5a is pressurized. be.
Further, as described above, in FIG. 5, the outer diameter of the rear shaft 4 with which the annular convex portion 8b is in contact is 10.2 mm, and in FIG. 6 in which the air in the closed space MK is compressed, the annular convex portion 8b is formed. The outer diameter of the abutting rear shaft 4 is 10.5 mm, and the difference in the outer diameter of the rear shaft 4 having a constricted shape when the annular convex portion 8b advances from the position of FIG. 5 to the position of FIG. Is set to 0.3 mm.

In the cap 8 in the state shown in FIG. 7, the operating portion 82a is further rotated to further shorten the length of the contact body 82 entering the inside of the cap body 81, and the cap 8 is used as a shaft. It is attached to the body 2, and the annular convex portion 8b of the cap 8 exceeds the hole portion 4d of the rear shaft 4, and is sandwiched between the cap body 81 and the shaft body 2 via the hole portion 4d. A gas accommodating portion K3 communicating with the second space portion K2 is formed, and a closed space MK is formed by the first space portion K1, the second space portion K2, and the gas accommodating portion K3. In the state of FIG. 7, a distance L3, which is a gap of 15 mm, which is three times the distance L1, is formed between the sliding body 822 and the rear end of the rear shaft 4.

When the cap 8 is attached to the shaft body 2 from the state shown in FIG. 7 to the state shown in FIG. 8, that is, until the rear end 2a of the shaft body 2 abuts on the sliding body 822 of the cap 8, the cap 8 is attached. The sliding body 822 moves a distance L3 of 15 mm until it comes into contact with the rear end 2a of the shaft body 2, and the annular convex portion 8b of the cap 8 advances while sliding on the outer peripheral surface of the shaft body 2. The air pressure inside the closed space MK composed of the one space portion K1, the second space portion K2, and the gas accommodating portion K3 is compressed to 2280 hPa, and the ink 6 in the ink tank 5a is pressurized. be.
Further, as described above, in FIG. 7, the outer diameter of the rear shaft 4 with which the annular convex portion 8b is in contact is 10.2 mm, and in FIG. 8 in which the air in the closed space MK is compressed, the annular convex portion 8b is formed. The outer diameter of the abutting rear shaft 4 is 10.6 mm, and the difference in the outer diameter of the rear shaft 4 having a constricted shape when the annular convex portion 8b advances from the position of FIG. 7 to the position of FIG. Is set to 0.4 mm.

As described above, in the state shown in FIG. 4, the air pressure inside the closed space MK is compressed to 1230 hPa, and in the state shown in FIG. 6, the air pressure inside the closed space MK is compressed to 1590 hPa, and FIG. In the state shown in FIG. 4, the air pressure inside the closed space MK is compressed to 2280 hPa, and the pressure of the ink 6 in the ink tank 5a is applied in the order of the state of FIG. 4 <the state of FIG. 5 <the state of FIG. growing.

As described above, in the ballpoint pen 1 of the present embodiment, by rotating the operation portion 82a that can be operated from the outside of the cap 8, when the cap 8 is attached to the rear of the shaft body 2, the back of the shaft body 2 is used. The distance until the end 2a abuts on the sliding body 822 of the cap 8 is changed, and as a result, the amount of air compressed in the MK in the closed space is changed to apply pressure to the ink 6 in the ink tank 5a. It is a structure that can be changed, and by setting the length at which the contact body 82 enters the inside of the cap body 81 in advance in the operation unit 82a, the amount when the user attaches the cap 8 It is possible to constantly pressurize the ink 6 according to the setting without worrying about the above.

1 ... Ballpoint pen (liquid ejector),
2 ... Shaft body (discharger body), 2a ... Rear end,
3 ... Front shaft, 3a ... Front end opening, 3b ... Reduced diameter part, 3c ... Fitting part, 3d ... Press-fitting part, 3e ... Protruding part,
4 ... Rear shaft, 4a ... Rib, 4b ... Fitting receiving part, 4c ... Press-fitting receiving part, 4d ... Hole part,
5 ... Ballpoint pen refill, 5a ... Ink tank (liquid storage part), 5b ... Ballpoint pen tip (tip tip), 5c ... Rear end part,
6 ... Ink (liquid),
7 ... Ink follower,
8 ... cap, 8a ... open end, 8b ... annular protrusion,
81 ... Cap body, 811 ... Top surface, 811a ... Female screw part (spiral groove part),
82 ... abutment body, 82a ... operation part, 82b ... outer flange part, 821 ... main body, 821 ... side surface, 821a ... male screw part (spiral protrusion),
822 ... Sliding body, 822a ... Recessed, 822b ... Inner collar,
K1 ... 1st space, K2 ... 2nd space, K3 ... gas accommodating, MK ... closed space.

Claims (3)

It is provided with a cylindrical discharge tool main body and a cap that can be attached to and detached from the front and rear of the discharge tool main body and has one end open and the other end closed.
A liquid discharger that discharges the liquid contained in the discharger body from a tip tip provided in front of the discharger body.
A liquid accommodating pipe for accommodating the liquid is provided inside the ejector main body.
A first space portion located behind the liquid contained in the liquid storage pipe is provided at the rear portion of the liquid storage pipe.
A second space portion communicating with the first space portion is provided between the discharge tool main body and the liquid storage pipe.
The ejection tool main body has a hole portion for communicating the outside of the ejection tool main body and the second space portion.
The cap has a cap body and a contact body provided with an operating portion that is movable in a direction along the axis and can be operated from the outside of the cap.
When the cap is attached to the rear of the discharge tool body, the inner peripheral surface of the cap body on the open end side is the discharge tool body until the rear end of the discharge tool body comes into contact with the contact body of the cap. By advancing while sliding on the outer peripheral surface,
A gas accommodating portion communicating with the second space portion is formed between the cap main body and the ejection tool main body through the hole portion, and the first space portion, the second space portion, and the gas accommodating portion are formed. A liquid discharger having a structure in which the liquid in the liquid storage tube is pressurized through the compressed air in the closed space composed of the above. The liquid discharge tool according to claim 1.
The cap body has a spiral groove on the top surface, and the contact body has a spiral protrusion on the side surface that is locked to the spiral groove, and the operation portion of the contact body. A liquid ejector having a structure in which the abutting body moves back and forth by rotating the contact body. The liquid discharge tool according to claim 2.
A liquid ejector having a structure in which the abutting body includes a main body and a sliding body that slides on the inner peripheral surface of the cap body in the front-rear direction, and the main body is rotatably connected to the sliding body.

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