JP2020001331A - Pressurizing liquid ejector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pressurized liquid ejector having a structure in which a pressing force is not easily affected by a change in the remaining amount of liquid in a liquid accommodating pipe. SOLUTION: A liquid storage pipe 8 for storing a liquid 7 is arranged inside a discharge tool main body 2, a tip tip 8a is arranged in front of the liquid storage pipe 8, and the tip 8a is arranged outside the liquid storage pipe 8. , A gas accommodating portion 9a communicating with the rear space 8b located behind the liquid 7 accommodated in the liquid accommodating pipe 8 is provided, and the air K2 in the liquid accommodating pipe 8 and the gas accommodating portion are provided behind the liquid accommodating pipe 8. Pressurizing mechanisms 11, 14, and 15 for maintaining the air K1 in 9a and the air K1 in a compressed state at the same time are provided. [Selection diagram] Fig. 1

Description

  The present invention relates to a pressurized liquid ejection device.

2. Description of the Related Art Conventionally, there is widely known a device that allows a liquid to flow out from a tip hole provided in the front of a main body, such as a writing tool such as a ballpoint pen or a marker or a coating tool such as a pen-type correction liquid or a liquid paste. There is also known a structure capable of increasing the outflow of water.
For example, in a writing instrument, as in Patent Document 1 (Japanese Patent Laid-Open No. 2000-335173), a pressurizing mechanism is provided behind a refill containing ink and pressurizes the ink tank in conjunction with a pressing operation of a knock body. A ballpoint pen has been conceived that uses a structure to increase the amount of ink flowing out of the pen tip to make the handwriting thicker or thicker.

JP 2000-335173 A

  However, the ballpoint pen disclosed in Patent Document 1 has a structure in which the pressurizing mechanism can pressurize only the air in the space behind the refill (liquid storage tube) containing the ink. As compared to the compression force when the (liquid) is not used and the amount of air in the space behind the refill is small, the compression force when the amount of ink decreases and the air in the space behind the refill increases becomes smaller. At the start of use of a ballpoint pen, where the air in the space behind the refill is easily compressed, a large amount of ink is ejected. The structure is such that the discharge amount of the ink is easily affected by the remaining amount of the ink.

  An object of the present invention is to provide a pressurized liquid ejector having a structure in which a pressing force is hardly affected by a change in the remaining amount of liquid in a liquid storage tube.

The present invention
"1. A pressurized liquid ejection device for ejecting a liquid contained in the ejection device body from a tip tip,
A liquid storage tube for storing the liquid is provided inside the ejection tool main body,
Disposing the distal tip in front of the liquid storage tube,
Outside the liquid storage tube, a gas storage unit that communicates with a rear space located behind the liquid stored in the liquid storage tube is provided,
A pressurized liquid ejection device, further comprising a pressurizing mechanism provided behind the liquid storage tube to maintain the air in the liquid storage tube and the air in the gas storage portion in a compressed state at the same time.
2. Inside the gas storage tube, the liquid storage tube is stored immovably back and forth,
Inside the discharge tool main body, the gas storage pipe and the liquid storage pipe are housed so as to be movable back and forth,
At the rear of the gas storage tube, a pusher is provided that pushes the gas storage tube and maintains the distal end tip in a state of protruding from the front end opening of the discharge device main body,
2. The pressurized liquid ejector according to claim 1, wherein the pressurizing mechanism is provided inside the pusher, and the presser is operated by the pressing of the pusher.
3. At the front of the gas storage tube, a front port is detachably attached,
A flange is provided in front of the liquid storage tube,
3. The pressurized liquid ejection device according to claim 2, wherein the front end and the liquid storage tube seal the front of the gas storage tube by sandwiching the flange. ".

The pressurized liquid ejection device of the present invention is configured such that the liquid in the liquid storage tube and the air in the gas storage section are pressurized to a pressure higher than the atmospheric pressure, so that the liquid is easily discharged, and the degree of pressurization is determined by the amount of the liquid. What is necessary is just to set suitably according to characteristics, such as viscosity, and the structure of a front-end | tip tip.
When the atmospheric pressure is 1000 hPa, for example, in the case of a writing implement ink having a low viscosity (for example, a viscosity of a writing implement having a viscosity of 1 mPa · s to 2000 mPa · s in an environment of 20 ° C.), the pressure of the air in the closed space is reduced. By applying a pressurized state exceeding the atmospheric pressure of 1000 hPa to a range of 1500 hPa, the ink for writing implements can be easily ejected. For example, a liquid having a high viscosity (for example, a viscosity at 20 ° C. in an environment of 20 ° C.) Is 3000 mPa · s to 50,000 mPa · s), the writing ink can be easily discharged by setting the pressure of the air in the closed space to a pressure of 1100 hPa to 5000 hPa. Become like However, the numerical value to be pressurized is not particularly limited, and may be appropriately set according to the characteristics such as the viscosity of the liquid and the structure of the tip as described above.

The pressurized liquid ejection device in the structure of the present invention can simultaneously pressurize the air in the liquid storage tube and the air in the gas storage portion and pressurize a large volume of air, so that the liquid in the liquid storage tube decreases, Even if the amount of air increases, the pressure does not easily change, and as a result, the discharge amount is stabilized. Since the volume of air that can be compressed is increased, the liquid can be pressurized for a long time with a low pressing force, and can be suitably used in a writing instrument that needs to perform a long discharge with a single pressurization. However, it can be suitably used in a ball-point pen using a low-viscosity ink that is easily ejected.
The volume of air stored in the gas storage portion is air A, the volume of liquid stored in the liquid storage tube in an unused state is liquid B, and the volume of air disposed behind the liquid is air C. In this case, the sum of the air A, the liquid B, and the air C is preferably 1.5 times or less the sum of the air A and the air C. This is to reduce the decrease in the pressing force due to the decrease in the liquid B. In particular, in a pressurized liquid ejection device using a low-viscosity liquid having a low pressurized amount of preferably less than 1100 hPa, a state where no liquid is used is used. It is possible to maintain a suitable discharge amount until the liquid becomes small.
In addition, when the liquid B stored in the liquid storage pipe is consumed, the air C increases to become the air C ′, and when the amount of the liquid becomes small, the air C ′ is the sum of the air C and the liquid B. It becomes.
By setting the volume of the air A or the volume of the air C to be large, it is possible to reduce the decrease in the pressurizing force due to the decrease of the liquid B, but to set the volume of the air C located behind the liquid B to be large. In order to obtain a compact, pressurized liquid ejector with a shorter overall length, the volume of air A in the gas storage portion located outside the Is preferably set large. In order to enlarge the gas storage portion, a space inside the ejection tool main body can be used.

Further, inside the gas storage tube, the liquid storage tube is housed immovably back and forth, and inside the ejection device main body, the gas storage tube and the liquid storage tube are housed so as to be able to move back and forth, and behind the gas storage tube. A pusher that pushes the gas storage tube to maintain the tip in a state of protruding from the front end opening of the discharge tool body, and a pressurizing mechanism is provided inside the pusher to push the pusher. With this structure, the pressurizing mechanism is operated, so that the pressurization can be performed in conjunction with the operation of pushing the pusher in order to protrude the tip tip, so that the operability is excellent.
In this case, a valve mechanism capable of opening and closing a communication state between the inside and the outside of the tip by an elastic force such as a coil spring is provided, and the liquid is not discharged from the tip when the tip is not pressed against a paper surface or the like. By doing so, even when a liquid having a low viscosity is used, it is possible to prevent the liquid from being discharged only by pressing the pressing body to apply pressure.

  In addition, a front port is detachably mounted in front of the gas storage pipe, and a flange is provided in front of the liquid storage pipe. The front port and the liquid storage pipe sandwich the flange to form the gas storage pipe. By adopting a structure in which the front portion is sealed, when the liquid stored in the liquid storage tube runs out, the leading end can be removed from the gas storage tube and replaced with a liquid storage tube filled with liquid. .

  When using a pressurized dispensing tool as a writing tool, the tip can be a ballpoint pen tip or felt tip, or a pen body such as a fountain pen with a pen tip or a pen core. Can be Since the tip is a final path for discharging the liquid in the storage tube to the outside, the size of the liquid flow path and the presence or absence of a valve mechanism determine whether the air in contact with the rear end of the liquid stored in the storage tube. Is related to the pressurized state. 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 the tip end with the valve mechanism, it is possible to prevent the liquid from being unintentionally discharged even when the air in the space in contact with the rear end of the liquid is greatly pressurized.

The liquid is not particularly limited as long as it can be stored in the liquid storage chamber, and may be appropriately selected depending on the use of the liquid ejection tool, such as writing ink, correction liquid, liquid glue, and cosmetic liquid. The ink for writing is not particularly limited, such as an oil-based ink or a water-based ink, and an ink having a shear thinning property can also be used.
In addition, thermochromic ink using a microcapsule pigment containing a thermochromic material as a coloring agent generally has a tendency to be difficult to increase the handwriting density because the capsule contains a coloring material. By using a pressurized liquid ejector having a structure, it is possible to increase the handwriting density by increasing the amount of ink flowing out due to pressurization.
In addition, as a method of increasing the handwriting density of the thermochromic ink containing the microcapsule pigment, there are cases where the amount of the microcapsule pigment serving as a colorant is increased and where the particle diameter of the microcapsule pigment is increased. When the amount of the microcapsule pigment is increased, the viscosity of the ink increases and the ink hardly flows out.When the particle diameter of the microcapsule pigment is increased, the pigment hardly passes through the ink flow path, and the ink becomes hard. May be difficult to flow out.
However, even with such an ink, the pressurized liquid ejection device of the present invention can be used because the ink can be forcibly ejected by pressurizing the ink.
In addition, the ink of the present invention can be applied to an ink containing a solid having a relatively large specific gravity, such as titanium oxide or a brilliant pigment, in the liquid and having a high viscosity when allowed to stand still so that the solid does not settle in the liquid. The pressure-type liquid ejection device can forcibly eject the ink by pressurizing the ink, similarly to the thermochromic ink containing the microcapsule pigment.
Further, even in the case where a dry liquid adheres to the tip chip, such as a correction liquid or a liquid paste, the liquid can be pressurized to be easily discharged.
As described above, the pressurized liquid ejection device of the present invention has a structure suitable as various liquid ejection devices.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to obtain the pressurized-type liquid discharge tool of a structure in which a pressurizing force is hardly affected by the change of the remaining amount of liquid in the liquid storage tube.

FIG. 3 is a vertical cross-sectional view of the ballpoint pen of the embodiment, showing a state in which a tip is immersed. FIG. 3 is a vertical cross-sectional view of the ballpoint pen of the embodiment, showing a state in which a tip is projected.

Next, description will be made with reference to the drawings, but the present invention is not limited to the following embodiments. In the present embodiment, a ballpoint pen, which is a writing instrument, will be described as a pressurized liquid ejection tool. However, the pressurized liquid ejection instrument having the structure of the present invention may be applied to a writing instrument such as a marker or a fountain pen, or a coating tool such as a correction pen or liquid paste. It can be used for tools or cosmetics.
In the present embodiment, the side with the tip is referred to as front, and the opposite side is referred to as back. For easy understanding, the same reference numerals are given to the same members and the same parts in the drawings.

As shown in FIG. 1, the ballpoint pen 1 of the present embodiment includes a shaft cylinder 2 (discharge tool main body) including a front shaft 3 and a rear shaft 4 screwed to the front shaft 3. A clip 5 is mounted on a side surface of the barrel 2.
The clip 5 is rotatably supported by a protrusion 4 a projecting from the side surface of the rear shaft 4. A coil spring 6 disposed between the rear portion of the clip 5 and the rear portion of the rear shaft 4 allows the clip 5 to rotate. The protrusion 5a formed on the inner surface of the rear shaft 4 is resiliently brought into contact with the side surface of the rear shaft 4.

Inside the barrel 2, a liquid storage tube 8 storing ink 7 is stored, and a tip 8 a disposed in front of the liquid storage tube 8 projects from a front end opening 3 a provided in front of the front shaft 3. You. The ink 7 is stored inside the liquid storage tube 8, a rear space 8b is formed behind the ink 7, and the air K1 is stored in the rear space.
A gas storage pipe 9 is provided outside the liquid storage pipe 8. An elastomer flange member 8 c provided in front of the liquid storage pipe 8 is connected to the front end of the gas storage pipe 9 and the gas storage pipe 9. It is clamped by the inner step 10a of the front end 10 screwed to the pipe 9. Thereby, the front of the gas containing pipe 9 is sealed, so that inflow and outflow of air can be prevented.
A front part of the piston member 11 is inserted behind the gas storage pipe 9. The piston member 11 is inserted until the flange 11 a formed on the side surface comes into contact with the rear end of the gas storage pipe 9, and the elastomer O-ring 12 locked in the concave portion 11 b formed on the piston member 11 It comes into contact with the inner surface of the housing tube 9. As a result, the rear of the gas storage pipe 9 is sealed, so that the inflow and outflow of air can be prevented.

The piston member 11 has a front opening 11c, and the rear part of the liquid storage tube 9 is inserted therein. A groove 11d is formed inside the front opening 11c.
A gas storage portion 9a is formed between the outer surface of the liquid storage tube 8 and the inner surface of the gas storage tube 9, and stores the air K2.
The groove 11d formed in the piston member 11 allows the air K1 in the liquid storage pipe 8 to communicate with the air K2 in the gas storage 9a. In the present embodiment, a plurality of grooves 11d are formed so that the inner bottom surface 11e and the inner side surface 11f of the piston member 11 communicate with each other, and are provided radially with respect to the axis. Therefore, even when the liquid storage tube 8 is formed long and comes into contact with the inner bottom surface 11e, the air K1 in the liquid storage tube 8 and the air K2 in the gas storage portion 9a are reliably communicated by the groove 11d. Can be.

From the rear end opening 4b of the rear shaft 4, a pushing portion 13a of a pushing body 13 disposed in the rear shaft 4 projects. The pushing body 13 has a front opening 13b, and a large diameter portion 11g formed in front of the piston member 11 is inserted therethrough. A small-diameter portion 11h is formed behind the piston member 11, and is inserted into the cylindrical cylinder member 14.
An O-ring 15 made of an elastomer, which is locked in a concave portion 11 i formed in the small-diameter portion 11 h of the piston member 11 abuts on the inner surface of the cylinder member 14. Thereby, the inflow and outflow of air between the piston member 11 and the cylinder member 14 can be prevented.
An elastomeric valve body 16 having a hemispherical valve portion 16a is inserted in the rear inside the pusher 13. The valve body 16 has an annular portion 16b formed on the outer periphery abutted on the front end of a vertical rib 13c formed on the inner surface of the pusher 13, and the movement to the rear is regulated.
As shown in FIG. 1, in a state where the tip 8 a is immersed in the shaft cylinder 2, a projection 14 a having a truncated pyramid-shaped through hole formed behind the cylinder member 14 is fitted to the valve portion of the valve body 16. 16A, the air K3 in the cylinder member 14, the air K4 in the piston member 11, and the liquid through the gap between the pushing member 13 and the cylinder member 14 and the gap between the piston member 11 and the pushing member 13. The air K1 in the storage tube 8 and the air K2 in the gas storage portion 9a communicate with the outside air and reach atmospheric pressure.

A coil spring 17 is housed inside the barrel 2, and the front end of the coil spring 17 is in contact with the inner step 3 b of the front shaft 3, and the rear end is in contact with the outer step 9 b of the gas storage pipe 9, to accommodate gas. The pipe 9 and the piston member 11 integrated with the gas storage pipe 9 are constantly repelled rearward. When the flange 9c formed so as to protrude outwardly comes into contact with the step 4d formed on the inner surface of the rear shaft 4, the gas storage pipe 9 is restricted from retreating due to the elastic force of the coil spring 17.
A coil spring 18 is housed inside the pushing body 13, and its front end is brought into contact with the outer step 11 j of the piston member 11, and its rear end is brought into contact with the front inner step 13 e of the pushing body 13. The pusher 13 is constantly repelled rearward. The pushing body 13 projects from the rear end opening 4b of the rear shaft 4 by being repelled by the coil spring 18.
In the present embodiment, the coil spring 17 is provided with an initial spring force of 3.0N, and the coil spring 18 is provided with an initial spring force of 1.8N.

Next, an operation method for projecting the tip 8a of the ball-point pen 1 to make it writable will be described with reference to FIGS.
The ballpoint pen 1 according to the present embodiment pushes the pushing portion 13 a of the pushing body 13 to cause the tip 8 a to protrude from the front end opening 3 a, and the projection 5 a of the clip 5 is formed on the side face of the pushing body 13. The protruding state of the tip 8a is maintained by being locked to the protrusion 13d. The bulging portion 13d is inserted through a window 4c formed on the side surface of the rear shaft 4 along the axial direction da so as to be able to move back and forth.

When the pushing body 13 is pushed forward, first, the valve portion 16a of the valve body 16 comes into contact with the projection 14a of the cylinder member 14, and then the rear inner step 13f formed on the pushing body 13 is brought into contact with the cylinder member 14. The cylinder member 14 is advanced while abutting on the formed outer step 14 b and compressing the coil spring 18 having an initial spring force lower than the coil spring 17. By further advancing the pushing body 13 from this state, the cylinder member 14 is advanced with respect to the piston member 11 which has been repelled backward by the coil spring 17. At this time, the projection 14a of the cylinder member 14 comes into contact with the valve portion 16a of the valve body 16 to be sealed, and the cylinder member 14 is kept sealed by the O-ring 15 while the cylinder member 14 and the piston member 11 are kept sealed. Advances, the air K3 in the cylinder member 14 is compressed. At this time, since the air K1 in the liquid storage tube 8, the air K2 in the gas storage portion 9a, the air K3 in the cylinder member 14, and the air K4 in the piston member 11 communicate with each other, Air is compressed.
In the present embodiment, the piston member 11, the cylinder member 14, and the O-ring 15 behind the liquid storage tube 8 constitute a pressurizing mechanism.

When the pusher 13 is further pushed, the front end of the cylinder member 14 comes into contact with the rear wall 11k of the large diameter portion 11g of the piston member 11, whereby the relative advance of the cylinder member 14 with respect to the piston member 11 is restricted. And further air compression stops.
Further, the gas storage pipe 9 is advanced through the cylinder member 14 and the piston member 11, and advances until the bulging portion 13 d of the pushing body 13 comes into contact with the front edge 4 e of the window 4 c of the rear shaft 4. . At this time, the protrusion 5a of the clip 5 rides over the bulging portion 13d of the pressing body 13 while compressing the coil spring 6, and the protrusion 5a is locked to the bulging portion 13d by the elastic force of the coil spring 6, so that the tip The tip 8a is maintained in a state of protruding from the front end opening 3a.
Therefore, when the ball-point pen 1 is in a writable state, that is, when the tip 8a protrudes from the front end opening 3a and is maintained, the ink 7 is maintained in a pressurized state.

  The ballpoint pen 1 of the present embodiment, when the atmospheric pressure is 1000 hPa, when the pusher 3 is pushed in a state where the ink 7 in the liquid storage tube 8 is not used, the air K1, the air K2, the air K3, The air pressure of the air K4 can be increased to 1026 hPa. When the ink 7 in the liquid storage tube 8 pushes the pusher 3 in a slight state, the air pressure of the air K1, the air K2, the air K3, and the air K4 is reduced. Can be pressurized to 1023 hPa.

The ball-point pen 1 has a total volume of the air K1 in the liquid storage pipe 8 arranged in series, the air K4 in the piston member 11, and the air K3 in the cylinder member 14, which is 255 mm when the ink 7 is not used. a ^3, a 463Mm ³ in a state in which the ink 7 becomes small, an amount corresponding to the volume 208 mm ³ of ink 7 was consumed air K1 is increased. On the other hand, the volume of the air K2 in the gas storage portion 9a disposed outside the liquid storage tube 8 is always 1657 mm ^{3, which} is always constant.
In this embodiment, the volume 1657Mm ³ air K2 accommodated in the gas accommodating section 9a, and the volume 208 mm ³ of liquid contained in the liquid storage tube 8 in the unused state, the air K1 disposed behind the liquid a volume 31 mm ^3, and volume 184 mm ³ air K3, the sum of the volume 40 mm ³ of air and K4, the volume 1657Mm ³ air K2, the volume 31 mm ³ of air K1 disposed behind the liquid, air K3 The sum of the volume of 184 mm ³ and the volume of air K 4 of 40 mm ³ is 1.109 times, and the difference is small. Therefore, even when the ink 7 is consumed, the decrease in the pressing force can be reduced. A stable discharge amount can be maintained.

  The ink 7 was mixed with 17 parts of microcapsule pigment (which had been cooled to −23 ° C. or less to make it black) by adding xanthan gum (shear-thinning agent) 0.5 part. , 10.0 parts of urea, 10 parts of glycerin, 0.6 part of phosphate ester surfactant, 0.1 part of modified silicone defoamer, 0.2 part of fungicide, and 61.6 parts of water It is a thermochromic ink that is uniformly dispersed in an ink vehicle to impart shear thinning. The handwriting by the ink 7 is black at room temperature (25 ° C.), and when the handwriting is rubbed with a friction body, the handwriting is erased and becomes colorless, and this state can be maintained at room temperature. When the paper after decoloring is placed in a freezer and cooled to a temperature of -23 ° C. or lower, the handwriting shows a discoloration behavior in which the handwriting becomes black again, and the behavior can be repeatedly reproduced.

The pushing body 13 protruding from the rear end opening 4b of the rear shaft 4 includes a base 131 formed of POM resin and a friction body 132 formed of an elastic material described later.
The elastic material constituting the friction member 132 is preferably a synthetic resin (rubber or elastomer) having elasticity. For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butylene) -Styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like.
The synthetic resin having elasticity is not a high-wear elastic material (for example, an eraser or the like), but a low-wear elastic material that hardly generates wear scum (erase scum) at the time of friction. By rubbing the handwriting by the ink 7, frictional heat is generated and the handwriting can be erased. Further, since the pushing portion 13a of the pushing body 13 is made of an elastic material (friction body 132) as described above, even if the resilient force of the coil spring 17 or the coil spring 18 for pushing the pushing body 13 backward is strong, the pushing body is not pushed. The structure is such that the finger pushing the key 13 is not slippery and easy to operate.

  At the rear end of the ink 7 in the liquid storage tube 8, a grease-like ink follower 7 a that follows with the consumption of the ink 7 is directly stored, and in front of the liquid storage tube 8, a ball is attached to the front end of the tip body 8 d. 8e (φ0.38 mm) is press-fitted with the tip 8a which rotatably holds the tip 8a. Behind the ball 8e, a coil spring 8f for pressing the ball 8e against the inner wall at the front end of the chip is provided as a valve mechanism for suppressing the leakage of ink from the front end of the chip.

The ink consumption value per unit area and the handwriting density before and after pressurization of the ballpoint pen 1 are as shown in Table 1. The measurement results shown in Table 1 show the results obtained when the ink 7 was not used and the results obtained when the ink 7 was slightly used.
The ink consumption per 10 m was measured according to JIS standard S6054 (20 ° C., writing angle 70 °, writing speed 4 m / min, self-revolution, writing load 100 gf, underlay stainless plate) This is obtained by measuring the remaining amount of ink after writing and calculating it. In addition, five such tests are performed five times in a row (50 m in total), and the average value is obtained.
Further, the handwriting width and handwriting density are based on the handwriting obtained by the above-described writing in accordance with ISO 13660, and the handwriting width (mm) is within a range of 60% or less of the reflectance, and the handwriting density is within a range of 75% or less of the reflectance. The handwriting width and handwriting density in the present invention can be determined by a personal image quality evaluation device (PIAS-II, manufactured by QEA (Quality Engineering Associates)). In the present invention, the measurement was made at 15 points, and the average value was obtained.
The ink viscosity was measured at a shear rate of 3.84 sec ^-1 (10 rpm) and a shear rate of 384 sec ^-1 (100 rpm) in a 20 ° C environment using a Brookfield DV-II viscometer (Cone rotor CPE 42). Measure the ink viscosity under the conditions.

  As the measurement results show, the ballpoint pen 1 of the present embodiment can perform writing in a state where the ink consumption and the line width are stable even when the ink 7 is reduced by writing.

Next, an operation method for immersing the tip 8a of the ball-point pen 1 to make the ball-point pen 1 portable will be described with reference to FIGS.
By pushing the rear end of the clip 5 shown in FIG. 2 against the shaft cylinder 2 against the elastic force of the coil spring 6, the engagement between the bulging portion 13 d of the pushing body 13 and the projection 5 a of the clip 5 is made. The stop state is released, and the liquid accommodating pipe 8, the gas accommodating pipe 9, the piston member 11, the pusher 13, and the cylinder member 14 are retracted to the state of FIG. 1 by the elastic force of the coil spring 17 and the coil spring 18, The tip 8a re-enters the front end opening 3a again.
As described above, when the tip 8a is immersed in the shaft cylinder 2, the projection 14a having a truncated pyramid-shaped through hole formed behind the cylinder member 14 is separated from the valve portion 16a of the valve body 16. The air K 3 in the cylinder member 14, the air K 4 in the piston member 11, and the liquid storage pipe 8 pass through the gap between the pushing body 13 and the cylinder member 14 and the gap between the piston member 11 and the pushing body 13. The inside air K1 and the air K2 inside the gas storage portion 9a communicate with the outside air and become atmospheric pressure again.

1: Ballpoint pen,
2 ... shaft tube,
3 ... front shaft, 3a ... front end opening, 3b ... inner stage,
Reference numeral 4: Rear shaft, 4a: Projection, 4b: Rear end opening, 4c: Window, 4d: Step, 4e: Front edge,
5: clip, 5a: projection,
6 ... Coil spring,
7 ... ink, 7a ... ink follower,
Reference numeral 8: liquid storage tube, 8a: tip, 8b: rear space, 8c: flange, 8d: tip body, 8e: ball, 8f: coil spring,
9: gas storage tube, 9a: gas storage portion, 9b: outer step, 9c: flange portion,
10: front end, 10a: inner stage,
11: piston member, 11a: flange, 11b: concave portion, 11c: front opening, 11d: groove portion, 11e: inner bottom surface, 11f: inner side surface, 11g: large diameter portion, 11h: small diameter portion, 11i: concave portion, 11j: outside Step, 11k ... rear wall,
12 ... O-ring,
13: Pushing body, 13a: Pushing part, 13b: Front opening, 13c: Vertical rib, 13d: Swelling part, 13e: Front inner stage, 13f: Rear inner stage, 13g: Base, 13h: Friction body,
14 ... Cylinder member, 14a ... Protrusion,
15… O-ring,
16: valve body, 16a: valve portion, 16b: annular portion,
17 ... Coil spring,
18 ... Coil spring,
K1, K2, K3, K4 ... air.

Claims (3)

A pressurized liquid ejection device for ejecting a liquid contained inside the ejection device body from the tip,
A liquid storage tube for storing the liquid is provided inside the ejection tool main body,
Disposing the distal tip in front of the liquid storage tube,
Outside the liquid storage tube, a gas storage unit that communicates with a rear space located behind the liquid stored in the liquid storage tube is provided,
A pressurized liquid ejection device, further comprising a pressurizing mechanism provided behind the liquid storage tube to maintain the air in the liquid storage tube and the air in the gas storage portion in a compressed state at the same time. Inside the gas storage tube, the liquid storage tube is stored immovably back and forth,
Inside the discharge tool main body, the gas storage pipe and the liquid storage pipe are housed so as to be movable back and forth,
At the rear of the gas storage tube, a pusher is provided that pushes the gas storage tube and maintains the distal end tip in a state of protruding from the front end opening of the discharge device main body,
2. The pressurized liquid ejection device according to claim 1, wherein the pressurizing mechanism is provided inside the pressing body, and the pressing mechanism is operated by the pressing of the pressing body. 3. At the front of the gas storage tube, a front port is detachably attached,
A flange is provided in front of the liquid storage tube,
The pressurized liquid discharging device according to claim 2, wherein the front end and the liquid storage tube seal the front of the gas storage tube by sandwiching the flange.

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