JP4848068B2 - Direct liquid writing instrument - Google Patents

Description

The present invention relates to a direct liquid writing instrument in which ink is directly stored in an ink tank and an ink occlusion body is interposed between the ink tank and a pen tip. In the present invention, “front” refers to the pen tip side, and “rear” refers to the ink tank side.

[1] Conventionally, in this type of direct liquid writing instrument, for example, Patent Document 1 discloses that “the upper opening of an ink container has a communication hole (communication tube) and a through hole and is filled with an absorbent material. A writing instrument characterized in that a brush is inserted into the body and communicated with the absorbent material, the ventilation tube is inserted into the through hole, and the outside air and the ink container are communicated.

The direct liquid writing instrument of Patent Document 1 has a configuration in which the vent pipe is always in communication with the outside air even if the connecting pipe and the vent pipe are provided in the upper opening of the ink container. For this reason, when the pen tip downward state is maintained, the outside air continues to be supplied to the ink container through the vent pipe, and at the same time, the ink in the ink container continues to be supplied to the absorbent material through the connecting pipe. As a result, the ink in the ink container may leak out from the pen tip side.

[2] Conventionally, Patent Document 2 states that “an ink storage chamber having an ink supply port in which a sealing lid is detachable is provided on one side of a container body, and the above-mentioned main body opening portion side The ink storage chamber is provided with a state in which an ink absorbing material storage chamber separated by a partition wall is communicated with the opening, and the storage chamber stores a liquid absorbing material having air permeability divided into two, and has a front end opening. The base side of the pen tip is held by the liquid-absorbing material on the part side, and the liquid-absorbing material on the side of the ink storage chamber is brought into contact with the end surface of the base, and the partition wall is supplied with liquid for supplying the stored ink to the liquid-absorbing material. A liquid hole is drilled, an appropriate air supply pipe is fixed, one end face opening of this air supply pipe is brought into contact with the liquid absorbing material on the front end opening side of the main body, and the other end face opening is close to the ink supply port. Sign pen characterized by being positioned in the ink storage chamber of There.

The direct liquid writing instrument of Patent Document 2 includes two liquid-absorbing materials, the front end surface of the air supply pipe is brought into contact with the rear end surface of the liquid-absorbing material on the front end of the main body, and the liquid supply hole is on the ink storage chamber side. In this configuration, the front end opening of the air supply pipe and the front end opening of the liquid supply hole are spaced apart from each other. For this reason, it becomes difficult to close the open end of the supply pipe with ink supplied from the liquid supply hole and impregnated in the liquid absorbing material (that is, to make the open end of the supply pipe liquid-sealed). The outflow and the air inflow into the ink tank (that is, the change of ink and air) cannot be stopped reliably. As a result, excessive ink may be supplied to the liquid absorbing material, and the ink may leak out from the pen tip side.

[3] Conventionally, Patent Document 3 states that “an ink adjusting tube and an ink conduit are concentrically arranged in the front shaft, a relay core is inserted into the ink conduit, and a rear end thereof is inserted into the ink chamber (ink tank). The tip is located at the back end of the brush body with a predetermined gap, and an ink absorber made of a porous material is mounted in the annular path between the ink adjusting tube and the ink conduit and on the back end of the brush body, The tip has a higher density than the other parts, an ink passage is formed at the rear end of the brush, and an air passage communicating with the outside air is formed between the inner surface of the front shaft and the outer surface of the ink adjusting tube. "A brush-like writing instrument in which the end communicates with the rear end of the ink adjusting tube."

Since the direct liquid type writing instrument of Patent Document 3 is configured to connect the ink tank and the ink absorber by only one ink conduit, at the time of initial ink discharge (that is, the ink is first transferred from the ink tank to the liquid absorbing material). It takes a considerable amount of time before the writing becomes possible because the air and ink do not change rapidly. The direct liquid writing instrument of Patent Document 3 has a large number of parts, a complicated structure, and is difficult to provide to users at low cost.

Japanese Utility Model Publication No. 45-18890 Japanese Utility Model Publication No. 56-7504 Japanese Utility Model Publication No. 60-7191

The present invention solves the above-mentioned conventional problems, and there is no possibility that the ink in the ink tank leaks out from the pen tip side, and the air and the ink are replaced quickly at the time of initial ink discharge, and in a short time. In addition, it is possible to write, and it is possible to provide a direct liquid writing instrument that can be simplified in structure and can prevent ink leakage and ink blowout from the pen tip side even when the pressure in the ink tank changes suddenly. Is.

(Configuration 1)
The present invention includes a nib 2, an ink storage 3 connected to the rear end of the nib 2, an ink tank 7 disposed behind the ink storage 3 and directly storing ink, and the ink A direct liquid type writing instrument comprising a tank 7 and a communication pipe 6 connecting between the ink storage body 3, comprising a plurality of the communication pipes 6, and a partition wall 52 between the ink storage body 3 and the ink tank 7. Each of the communication pipes 6 is projected forward from the front surface of the partition wall 52, and the front end of each of the communication pipes 6 is positioned inside the ink storage body 3 so that the ink storage body 3 is connected to the high density portion 31. A low-density part 32 connected to the rear of the high-density part 31, and the high-density part 31 has the front end of each of the communication pipes 6 and the rear end of the nib 2 at least one The communication pipe 6b protrudes rearward from the rear surface of the partition wall 52, and The rear end of the through tube 6b to the requirements that were located inside the ink tank 7 (configuration 1).

In the direct liquid writing instrument (Configuration 1), the rear end of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is located above the ink liquid surface depending on the direction of the pen tip 2 and the ink remaining amount in the ink tank 7. In some cases, it is located below the ink level (that is, in the ink). When the rear end of the communication pipe 6b protruding rearward from the rear face of the partition wall 52 is positioned above the ink liquid level, the air flow between the ink tank 7 and the outside air is caused by the communication pipe 6b protruding rearward. Ink is circulated between the ink tank 7 and the ink occlusion body 3 by the other communication pipe 6a. On the other hand, when the rear end of the communication tube 6b protruding rearward from the rear surface of the partition wall 52 is located below the ink liquid surface, the air between the ink tank 7 and the outside air is provided by at least one communication tube 6. The ink is distributed between the ink tank 7 and the ink occlusion body 3 through another communication pipe 6.

When the ink 8 in the ink tank 7 is supplied to the ink occlusion body 3 in the direct liquid writing instrument 1 (Configuration 1), when the pen tip 2 is turned downward, the ink 8 in the ink tank 7 is at least caused by gravity. The ink is supplied to the high density portion 31 of the ink occlusion body 3 through one communication pipe 6 and impregnated in the high density portion 31. At the same time, the outside air is taken into the ink tank 7 through the other communication pipe 6.

When the amount of ink impregnated in the high-density portion 31 of the ink occlusion body 3 reaches a certain amount, the front end opening of the other communication pipe 6 that has taken in the outside air becomes liquid-sealed with the impregnated ink and is temporarily closed. Then, the supply of outside air into the ink tank 7 is stopped. At the same time, the ink supply from the ink tank 7 to the ink occluding body 3 by the communication pipe 6 that has been supplying the ink is also stopped. As a result, the front end opening of each of the communication pipes 6 is in a liquid-sealed state temporarily. The ink tank 7 is closed, and the ink outflow from the ink tank 7 and the air inflow into the ink tank 7 (that is, replacement of ink and air) are stopped.

In the direct liquid writing instrument 1 (configuration 1), each of the communicating tubes 6 includes a portion in which the ink occlusion body 3 sets a high density in the vicinity of the front end of each communicating tube 6 (a high-density portion 31 having a large capillary force). And a portion where the density of the portion other than the vicinity of the front end is set low (low density portion 32 having a small capillary force). Therefore, the ink in the ink occlusion body 3 can be preferentially impregnated in the high density portion 31 rather than the low density portion 32. Thereby, each front end opening of the communication pipe 6 can be reliably liquid-sealed with the impregnation ink. As a result, when the pressure in the ink tank 7 decreases due to a temperature drop or the like, the ink impregnated in the ink storage body 3 does not remain in the ink storage body 3, and the high density portion of the ink storage body 3 From 31, it passes through the communication pipe 6 and is properly returned into the ink tank 7.

Since the direct liquid writing instrument 1 (Configuration 1) is configured such that the front ends of the communication pipes 6 are located in the high-density portion 31 of the ink storage body 3, all of the front end opening portions of the communication pipes 6 are arranged. The ink occlusion body 3 can be easily closed by a liquid seal of ink impregnated in the ink occlusion body 3. As a result, excess ink is not supplied from the ink tank 7 to the ink occlusion body 3, and there is no possibility that the ink leaks outside from the pen tip 2 side.

Further, the direct liquid writing instrument 1 (Configuration 1) includes a plurality of communication pipes 6 (that is, two or more), so that when at least one of the communication pipes 6 supplies ink, the other communication pipes 6 are provided. Will supply air. Therefore, at the time of initial ink ejection (that is, when ink is first supplied to the ink occlusion body 3 not impregnated with ink), the ink and air are quickly replaced, and writing can be performed in a short time.

Further, the direct liquid writing instrument 1 (Configuration 1) has an arrangement in which the rear end of the pen tip 2 is positioned in the high-density portion 31, so that the ink supply from the ink tank 7 such as the pen tip upward state or the writing tool main body horizontal state is provided. Even when there is no ink, the ink can be sufficiently written by the ink impregnated in the high density portion 31 of the ink occlusion body 3.

Further, when the pressure in the ink tank 7 rises due to a temperature rise or the like, the direct liquid writing instrument 1 (Configuration 1) causes the excess ink pushed out from the ink tank 7 to pass through the communication pipe 6. The ink is supplied into the occlusion body 3 and is temporarily impregnated in the ink occlusion body 3. On the other hand, when the pressure in the ink tank 7 decreases due to a temperature drop or the like, the ink impregnated in the ink storage body 3 passes through the communication pipe 6 through the ink storage body 3 into the ink tank 7. Returned. As a result, when the pressure in the ink tank 7 changes, the excess ink in the in-tank 7 can be appropriately absorbed by the ink storage 3 and then the excess ink can be properly returned to the ink tank 7. . As a result, the ink can be sufficiently prevented from leaking to the outside.

Further, the direct liquid writing instrument 1 (Configuration 1) is configured such that at least one communication pipe 6b protrudes rearward from the rear surface of the partition wall 52 and the rear end of the communication pipe 6b is positioned inside the ink tank 7. When a sudden pressure change occurs in the state where the pen tip is downward, the pressurized air in the ink tank 7 passes through the rear end opening of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52. The ink passes through the inside and then passes through the inside of the ink occlusion body 3 and is quickly discharged to the outside, so that there is no possibility that the ink leaks or blows out from the pen tip 2 side. That is, the direct liquid writing instrument 1 (Configuration 1) can prevent ink leakage or ink blowing from the pen tip 2 side even when the pressure in the ink tank 7 changes suddenly in a state where the pen tip is downward.

In particular, even when the rear end of the communication pipe 6b protruding rearward is not positioned above the ink liquid level when the pen tip is downward, the rear of the communication pipe 6b protruding rearward from the ink liquid level Compared to the distance from the ink liquid surface to the rear surface of the partition wall 52 (that is, the distance between the rear end of the communication tube 6 and the ink liquid surface when the rear end of the communication tube 6 does not protrude rearward from the rear surface of the partition wall 52). Therefore, when the pressure in the ink tank changes suddenly with the pen tip downward, a large amount of ink in the ink tank 7 is not pushed out to the ink occluding body 3 and passes through each communication pipe 6. 7, a little excess ink is pushed out from the inside of the ink storage body 3 and is held by the ink storage body 3, and immediately, the rear end opening of the communication pipe 6b protruding rearward and the space above the ink liquid surface Communicated with the ink surface. Square of pressurized air, is discharged to the outside through the communicating pipe 6b which projects the rear. Thereby, even when a sudden pressure change occurs in the pen tip downward state, it is possible to sufficiently prevent ink leakage and ink blowing from the pen tip 2 side.

The case where the pressure in the ink tank 7 suddenly changes is, for example, a state in which the air in the ink tank 7 is pressurized in a high temperature environment after the cap is attached to the pen tip side in a low temperature environment. In the case of removing the cap from the pen tip side, or after removing the cap from the pen tip side in a decompressed state such as in an airplane after the cap is attached to the pen tip side at 1 atmosphere pressure on the ground.

(Configuration 2)
In the direct liquid writing instrument 1 having the configuration 1, each of the communication pipes 6 penetrates the inside of the low-density part 32, and the high-density part 31 has a front end of each of the communication pipes 6 and the nib 2. It is preferable that the rear end is positioned (Configuration 2).

The direct liquid writing instrument 1 (Configuration 2) has a configuration in which each of the communication pipes 6 penetrates the inside of the low density portion 32, so that the outer diameter of the portion that accommodates the ink storage body 3 is sufficiently increased. It is possible to set a low-density portion 32 having a large volume. If each of the communication pipes 6 is connected to the high density portion 31 without penetrating the inside of the low density portion 32, the outer diameter of the portion that accommodates the ink occluding body 3 becomes thick and it is difficult to grip the writing instrument body. There is a possibility that the volume of the low density portion 32 becomes small, and the excess ink from the ink tank 7 may not be sufficiently absorbed.

(Configuration 3)
In the direct liquid writing instrument 1 having the configuration 1 or 2, when the front end of each of the communication pipes 6 is inserted from the rear end of the ink storage body 3, the front ends of the communication pipes 6 pass through the interior of the ink storage body 3. It is preferable that the high-density portion 31 is formed inside the ink occlusion body 3 in the vicinity of the front end of each of the communication pipes 6 by pressing and compressing forward (Configuration 3).

The direct liquid writing instrument 1 (configuration 3) includes a difference in density of the ink occlusion body 3 (that is, the high density portion 31 and the low density portion 32 of the ink occlusion body 3), and the front end of each communication pipe 6 at the ink occlusion body. 3 is inserted forward from the rear end, and the inside of the ink occlusion body 3 is formed by pressing and compressing the inside of the ink occlusion body 3 forward. There is no need to provide it, and manufacturing becomes extremely easy, and the occurrence of poor connection between the front ends of the communication pipes 6 and the high-density portions 31 can be suppressed.

(Configuration 4)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 3, the high-density portion 31 is formed by pressing and compressing the outer surface of the ink occlusion body 3 radially inward (configuration 4). preferable. Thereby, there is no need to provide a density difference in the ink occlusion body 3 in advance, and the production becomes extremely easy.

(Configuration 5)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 4, it is preferable that the high-density portion 31 is formed by pressing and compressing the front end surface of the ink occlusion body 3 backward (configuration 5). Thereby, there is no need to provide a density difference in the ink occlusion body 3 in advance, and the production becomes extremely easy.

(Configuration 6)
In the direct liquid writing instrument 1 having the configuration 1 or 2, the ink occluding body 3 includes a first ink occluding body set at a high density and a second ink occluding body set at a low density, It is preferable that the first ink occlusion body constitutes the high density portion 31 and the second ink occlusion body constitutes the low density portion 32 (configuration 6). Thereby, the high density part 31 and the low density part 32 (namely, density difference in the ink occlusion body 3) can be reliably set to the ink occlusion body 3 without variation.

(Configuration 7)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 6, the present invention closes the front end opening of the ink tank 7 before opening with the stopper 71, and connects the connecting pipe 54 behind the rear surface of the partition wall 52. The connecting pipe 54 is inserted into the front end opening of the ink tank 7, and the connecting pipe 54 presses the plug 71 to open the ink tank 7. After opening, the communication pipe 6b projecting rearward from the rear surface of the partition wall 52 is located inside the connection pipe 54, and the rear end of the communication pipe 6b projecting rearward from the rear surface of the partition wall 52 is the connection pipe 54. The axial position of the rear end of the communication pipe 6b that is located in front of the rear end of the partition wall 52 or protrudes rearward from the rear face of the partition wall 52 and the rear end of the connection pipe 54 are substantially the same (Configuration 7). ) As a requirement.

When the connecting pipe 54 is inserted into the front end opening of the ink tank 7, the direct liquid writing instrument 1 (configuration 7) presses the plug 71 properly and the ink tank 7 is reliably opened. In addition, there is no possibility that the ink in the ink tank leaks outside when the ink tank 7 is opened. If the rear end of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 protrudes greatly rearward from the rear end of the connection pipe 54, when the connection pipe 54 is inserted into the front end opening of the ink tank 7, There is a risk that the communication pipe 6b abuts against the plug 71 and the ink tank 7 cannot be reliably opened, or the front end opening of the ink tank 7 is inserted before the connection pipe 54 is completely inserted into the front end opening of the ink tank 7. There is a possibility that the plug 71 is detached from the portion and the ink leaks to the outside.

(Configuration 8)
According to the present invention, in the direct liquid writing instrument 1 having the configuration 7, a protruding piece 54a that presses one side of the plug body 71 when the ink tank 7 is opened is provided on one side of the rear end of the connecting pipe 54, and the rear surface of the partition wall 52 It is a requirement that the outer surface of the communication pipe 6b that protrudes further rearward and the inner surface of the protruding piece 54a be close to each other (Configuration 8).

When the ink tank 7 is opened, the direct liquid writing instrument 1 (Configuration 8) can properly remove the plug 71 by pressing one side of the plug 71 with the protruding piece 54a. If the outer surface of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is not close to the inner surface of the protruding piece 54a, the ink tank 7 is protruded rearward from the rear surface of the partition wall 52 when the ink tank 7 is opened. There is a possibility that the communication pipe 6b abuts against the plug body 71, hinders the smooth opening operation of the plug body 71, and the ink tank 7 cannot be properly opened.

(Configuration 9)
According to the present invention, in the direct liquid writing instrument 1 having any one of the configurations 1 to 8, the volume V2 of the ink occlusion body 3 is set to 40 of the volume V1 of the space formed by the ink tank 7 and the communication pipes 6. % (Preferably 50% or more) (configuration 9) is a requirement.

In the direct liquid writing instrument 1 (Configuration 9), when the ratio of the volume V2 to the volume V1 is set to 40% or more (preferably 50% or more), the pressure in the ink tank 7 rapidly changes. Even if the ink 8 in the ink tank 7 is pushed out through the communication pipe 6, the ink 8 is properly impregnated in the ink occlusion body 3. Thereby, it is possible to sufficiently prevent the ink from leaking out or blowing out from the pen tip 2 side.

When the ratio of the volume V2 to the volume V1 is less than 40%, there is a possibility that a sufficient amount of ink from the ink tank 7 cannot be held by the ink occlusion body 3 when the pressure in the ink tank 7 changes abruptly. . In the direct liquid writing instrument 1 (Configuration 9), the volume V2 is preferably set to 70% or less of the volume V1. When the ratio of the volume V2 to the volume V1 exceeds 70%, the amount of ink stored in the ink tank 7 becomes excessively small and the writable distance becomes short, which is not practical. It is effective to set the ratio of the volume V2 to the volume V1 in the range of 40% to 70%, preferably in the range of 50% to 70%.

Note that the volume V1 of the space formed by the ink tank 7 and each of the communication pipes 6 is the total volume of the volume in the ink tank 7 and the volume in each of the communication pipes 6. The volume V2 of the ink occlusion body 3 refers to the volume of the ink occlusion body 3 excluding the pen tip 2 and the portion of each communication pipe 6 inserted into the ink occlusion body 3.

(Configuration 10)
In the direct liquid writing instrument 1 of any one of the configurations 1 to 9, the ink absorber 63 having a capillary gap is disposed inside each of the communication tubes 6, and the capillary force of the ink absorber 63 is increased. It is preferable to set it smaller than the capillary force of the density portion 31 (Configuration 10). Even when the outer diameter and the inner diameter of each communication pipe 6 are set to be relatively large in order to suppress the bending of the communication pipe 6 by the direct liquid writing instrument 1 (configuration 10), the front end opening of the communication pipe 6 is appropriately A liquid seal is obtained.

(Configuration 11)
In the direct liquid writing instrument 1 of any one of the configurations 1 to 10, it is preferable that the axial positions of the front ends of the communication pipes 6 are set to be equal to each other (configuration 11).

The direct liquid writing instrument 1 (configuration 11) is configured such that the axial positions of the front ends of the communication pipes 6 are set equal to each other (that is, the front ends of the communication pipes 6 are not separated from each other). Therefore, the distance between the front ends of the communication pipes 6 inside the ink occlusion body 3 is further shortened, the liquid sealability of the front end openings of the communication pipes 6 is improved, and ink leaks to the outside. Can be further prevented.

(Configuration 12)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 11, it is preferable that the front end of each of the communication pipes 6 is positioned in the vicinity of the rear end of the nib 2 (configuration 12).

The direct liquid writing instrument 1 (configuration 12) has a configuration in which each front end of the communication pipe 6 is positioned in the vicinity of the rear end of the pen tip 2, so that no matter which ink is supplied from the front end opening of any communication pipe 6, The ink can be quickly supplied to the tip 2. As a result, writing can be performed reliably in a short time when the initial ink is dispensed.

(Configuration 13)
In the direct liquid writing instrument 1 of any one of the configurations 1 to 12, the rear end of the pen tip 2 and the front end of each of the communication pipes 6 are connected via the high-density portion 31 so that ink can be circulated. (Configuration 13) is preferable.

In the direct liquid writing instrument 1 (configuration 13), since the rear end of the pen tip 2 and the front end of each of the communication pipes 6 are not directly connected, at least the rear end of the pen tip 2 and the communication pipe 6 are used. A predetermined amount of ink is impregnated in the ink storage body 3 between each of the front ends. Thereby, even when there is no ink supply from the ink tank 7 such as the pen tip upward state or the writing instrument main body horizontal state, the ink occlusion body 3 between the rear end of the pen tip 2 and the front end of each of the communication pipes 6. Writing can be sufficiently performed by the ink impregnated in the inside (inside the high density portion 31). Further, there is no possibility that excess ink is directly supplied from the ink tank 7 to the nib 2 and leaks outside.

(Configuration 14)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 13, it is preferable that the front end surface of the ink occlusion body 3 and the rear end surface of the ink occlusion body 3 communicate with outside air (configuration 14).

The direct liquid writing instrument 1 (configuration 14) can release the air inside the ink occlusion body 3 from the front end face of the ink occlusion body 3 and the rear end face of the ink occlusion body 3. As a result, the ink supplied from the front end opening of the communication pipe 6 inside the ink storage body 3 is passed from the vicinity of the front end of the communication pipe 6 inside the ink storage body 3 to the front end direction and the communication of the ink storage body 3. The ink occlusion body 3 in the vicinity of the front end of the tube 6 can be smoothly moved from the inside to the rear end direction of the ink occlusion body 3. In particular, when the pressure in the ink tank 7 rises due to a temperature rise or the like, the ink pushed out from the ink tank 7 smoothly passes through the front end of the communication pipe 6 when the rear end surface of the ink occlusion body 3 communicates with the outside air. It moves rearward through the vicinity of the front end of the communicating pipe 6 of the occlusion body 3 and is impregnated behind the ink occlusion body 3 to prevent leakage of the ink to the outside. On the other hand, the pressure in the ink tank 7 is reduced due to a temperature drop or the like. At this time, the impregnated ink behind the ink storage body 3 can be returned to the ink tank 7 through the communication pipe 6 from the front end opening of the communication pipe 6 through the vicinity of the front end of the communication pipe 6 inside the ink storage body 3. .

(Configuration 15)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 14, it is preferable that the side walls of the communication pipe 6 are connected to each other (configuration 15). Thereby, the bending strength of each communicating pipe 6 improves, and the bending of each communicating pipe 6 can be suppressed.

(Communication pipe)
In the present invention, the communication pipe 6 is preferably made of synthetic resin or metal in that it has a certain rigidity. Further, the cross-sectional shape of the outer peripheral surface and inner peripheral surface of the communication pipe 6 may be any of, for example, a circle, an ellipse, or a polygon such as a triangle or a quadrangle. Moreover, the number of the said communication pipe | tube 6 should just be two or more (namely, 2 or more), for example, 2, 3, 4, 5 or 6 etc. are mentioned.

Each of the communication pipes 6 extends in the front-rear direction, and a flow passage 62 is provided through each of the communication pipes 6 in the front-rear direction. That is, each of the communication pipes 6 has openings at both ends (front end and rear end).

Further, the plurality of communication pipes 6 may be configured so that a plurality of independent flow passages 62 are formed in parallel in the interior thereof. For example, the respective communication pipes 6 are separated in the radial direction (see FIG. 1 to FIG. 6), a configuration in which the side walls of the respective communication pipes 6 are connected to each other (see FIG. 7 to FIG. 9), or a structure in which a small diameter communication pipe 6b is disposed inside a large diameter communication pipe 6a (FIG. 10). For example).

The front ends of the communication pipes 6 are preferably located at equal intervals on the same circumference with the nib 2 as the center. Further, the front end of each of the communication pipes 6 may be opened forward in the axial direction or may be opened outward in the radial direction. Examples of the shape of the front end of each communication pipe 6 include an inclined cut surface, a vertical surface, a conical surface, and a convex curved surface. The rear end of each of the communication pipes 6 may be opened rearward in the axial direction or may be opened radially outward.

The rear end of each of the communication pipes 6 may protrude rearward from the rear surface of the partition wall 52, but at least one communication pipe 6b protrudes rearward from the rear surface of the partition wall 52 and other communication pipes 6a. A configuration in which the rear end of the rear end of the communication pipe 6b protrudes rearward from the rear end of the communication pipe 6b or a rear end of the other communication pipe 6a does not protrude rearward from the rear surface of the partition wall 52 (that is, the rear end of the communication pipe 6a A configuration in which the rear surface of the partition wall 52 is matched is preferable.

(Ink storage)
In the present invention, the ink occlusion body 3 may be made of a member having continuous pores that can be impregnated with ink (that is, a porous material). Resin processed body, felt resin processed body, felt needle punch processed body, synthetic resin open cell body, and the like. In addition, the ink occlusion body 3 may be configured to have an outer skin made of a synthetic resin film or the like on its outer peripheral surface. Further, the inside front of the ink occlusion body 3 refers to the inside of the front half of the ink occlusion body 3. The ink occlusion body 3 may be a single member or a plurality of members having different capillary forces.

(Ink storage density)
In the present invention, the density of the ink occlusion body 3 is a density of a porous structure such as a fiber density. In the high density portion 31 of the ink occlusion body 3, the gap width of the capillary gap is reduced, and in the low density portion 32 of the ink occlusion body 3, the gap width of the capillary gap is increased. Thereby, the capillary force of the high density portion 31 is larger than the capillary force of the low density portion 32.

(Nib)
In the present invention, the nib 2 is, for example, a fiber bundle resin processed body, a fiber bundle heat fusion processed body, a felt processed body, a pipe-shaped pen body, and a fountain pen type plate-shaped pen body having a slit at the tip. A brush pen body, a porous foam of a synthetic resin, a ballpoint pen tip, an extruded body of a synthetic resin having an axial ink guide path, and the like. The material constituting the rear end of the nib 2 may be at least provided with a capillary gap in order to enable proper connection with the ink occlusion body 3, for example, a resin processed body of fiber bundles. Examples thereof include a porous material such as a heat-bonded body of a fiber bundle, a felt processed body, and a porous foam of a synthetic resin, or an extruded body of a synthetic resin having an ink guide path in the axial direction. In the present invention, the nib 2 includes an ink guide member.

(Ink absorber)
The ink absorber 63 only needs to have a capillary gap, such as a fiber bundle resin processed body, a fiber bundle heat-bonded processed body, a felt processed body, and a synthetic resin porous foam. Examples thereof include a porous material or an extruded product of a synthetic resin having an axial ink guide path. The capillary force of the ink absorber 63 is preferably set to be smaller than the capillary force of the front portion (high density portion 31) from the front end of each of the communicating tubes 6 inside the ink storage member 3.

(Partition wall)
The partition wall 52 divides the ink occluding body 3 and the ink tank 7, and actually divides the ink tank and the occluding body accommodating portion for accommodating the ink occluding body 3. The rear surface of the partition wall 52 faces the ink tank 7.

(Ink tank)
For example, the ink tank 7 is formed directly on the writing instrument body (that is, the ink tank 7 constitutes a part of the writing instrument body as shown in FIG. 1) or is housed in the writing instrument body (FIG. 11). , See FIG. 14). In the present invention, the ink 8 stored in the ink tank 7 specifically includes writing instrument ink (for example, water-based ink, oil-based ink) or coating liquid (for example, cosmetic liquid, correction liquid, adhesive, Paint, liquid medicine, etc.).

According to the present invention, the ink in the ink tank is not likely to leak from the pen tip side, and the air and the ink can be changed quickly at the time of initial ink discharge, and writing can be performed in a short time. Even when there is no ink supply from the ink tank, such as the state or the horizontal state of the writing instrument body, the ink impregnated inside the ink occlusion body can be fully written, and the structure can be simplified, and the pen tip is downward Even when the pressure in the ink tank suddenly increases, leakage of ink from the pen tip side can be prevented.

According to the second aspect of the present invention, a low-density portion having a sufficient volume can be set without increasing the outer diameter of the portion that accommodates the ink storage member.

According to the third aspect of the present invention, there is no need to provide a density difference in the ink storage body in advance before the communication pipe is incorporated into the ink storage body, and manufacturing becomes extremely easy. The occurrence of poor connection can be suppressed.

In the present invention, it is not necessary to provide a density difference in the ink occlusion body in advance, and the production becomes extremely easy.

According to the fifth aspect of the present invention, there is no need to previously provide a density difference in the ink occlusion body, and the production becomes extremely easy.

In the present invention, the configuration 6 can reliably set the density difference in the ink occlusion body without variation.

According to the seventh aspect of the present invention, when the connecting pipe is inserted into the front end opening of the ink tank, the connecting pipe can press the stopper appropriately and the ink tank can be reliably opened, and when the ink tank is opened. There is no risk of the ink in the ink tank leaking outside.

According to the present invention, when the ink tank is opened, the stopper can be properly removed by the configuration 8.

According to the ninth aspect of the present invention, the ink can be sufficiently prevented from leaking out or blowing out from the pen tip side.

(First embodiment)
A direct liquid writing instrument 1 according to a first embodiment of the present invention is shown in FIGS.
The direct liquid writing instrument 1 of the present embodiment includes a pen tip 2, an ink occlusion body 3 connected to the rear end of the pen nib 2, the pen tip 2 held at the front end, and the ink occlusion body 3 An occlusion body accommodating portion that is accommodated inside, an ink tank 7 that is attached to the rear of the occlusion body accommodating portion and directly stores ink 8 therein, and a partition that partitions the occluded body accommodating portion and the ink tank 7 52 and a plurality of (specifically, two) communication pipes 6 that protrude forward from the front surface of the partition wall 52 and are pierced and connected to the inside of the ink storage body 3. The occlusion body housing portion includes a tip member 4 that holds the nib 2 and an intermediate member 5 that connects the tip member 4 and the ink tank 7.

Pen nib The nib 2 is a rod-like body obtained by resin processing of synthetic resin fibers (for example, polyester fibers, acrylic fibers, nylon fibers, etc.). The tip of the nib 2 is ground like a cannonball. The outer peripheral surface of the rear end portion of the nib 2 is chamfered in a tapered shape. An annular groove 21 is formed at the intermediate portion of the nib 2.

Ink occlusion body The ink occlusion body 3 is made of a processed body of cylindrical synthetic resin fibers (for example, polyester fibers). The outer peripheral surface of the ink occlusion body 3 is covered with a cylindrical outer skin. The outer skin is made of a synthetic resin film (for example, a polyethylene terephthalate film). The rear end of the pen tip 2 is inserted into the axial center of the front end surface of the ink storage body 3 and the rear end of the pen tip 2 is positioned in front of the ink storage body 3.

-Tip member The tip member 4 is a cylindrical body obtained by injection molding of synthetic resin (for example, polypropylene, polyethylene, etc.). The tip member 4 includes a small-diameter portion 41 that holds the outer peripheral surface of the nib 2 and a large-diameter portion 42 that is connected to the rear of the small-diameter portion 41 and holds the front outer peripheral surface of the ink occlusion body 3.

A plurality of ribs 43 extending in the front-rear direction are integrally formed on the inner surface of the tip member 4 (that is, from the inner surface of the small diameter portion 41 to the inner surface of the large diameter portion 42). In the rib 43, a step-shaped regulation wall 43 a is formed at an intermediate portion between the small diameter portion 41 and the large diameter portion 42 of the tip member 4. The front end of the ink occlusion body 3 abuts against the restriction wall 43a in the axial direction, and the front outer peripheral surface of the ink occlusion body 3 is pressed and held by the rib 43 on the inner surface of the large diameter portion. The rib 43 is formed with a locking projection 43 b on the inner surface of the small diameter portion 41. On the inner surface of the small-diameter portion 41, the outer peripheral surface of the nib 2 is pressed and held in the radial direction by the rib 43, and the annular groove 21 on the outer peripheral surface of the nib 2 is engaged with the locking convex portion 43b. Movement in the front-rear direction is restricted.

By the ribs 43, the space between the front outer peripheral surface of the ink occlusion body 3 and the inner surface of the large-diameter portion 42, the front end surface of the ink occlusion body 3 and the inner surface of the intermediate portion of the tip member 4, and the outer surface of the pen tip 2. And the air passage 10 is formed between the inner surface of the small-diameter portion 41. The front side of the air passage 10 is opened to the outside from the front end of the leading member 4, and the rear side of the air passage 10 is in communication with the rear end surface of the ink storage body 3. That is, the air passage 10 communicates the front end surface of the ink storage body 3 and the rear end surface of the ink storage body 3 with the outside air.

Intermediate member The intermediate member 5 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 5 includes a front cylinder portion 51 opening forward, a partition wall 52 formed at the bottom of the front cylinder portion 51, a rear cylinder portion 53 extending rearward from the partition wall 52 and opening rearward. A plurality of (specifically, two) communication pipes 6 projecting forward in the axial direction from the front surface of the partition wall 52 are integrally connected. In the present embodiment, the partition wall 52 and the communication pipe 6 are integrally connected. However, in addition to this, the partition wall 52 and the communication pipe 6 made of different members may be fixed.

The outer peripheral surface of the large-diameter portion 42 of the tip member 4 is press-fitted and fixed to the inner peripheral surface of the front cylinder portion 51. The ink occlusion body 3 is accommodated in a space (that is, an occlusion body accommodation portion) formed by the front cylinder portion 51, the partition wall 52, and the large diameter portion 42 of the tip member 4. An opening of the ink tank 7 is detachably attached to the rear cylinder portion 53. Specifically, the opening of the ink tank 7 is detachably attached to the rear cylinder portion 53 by screwing.

The partition wall 52 and the rear end surface of the ink storage body 3 are maintained in a non-contact state, and a gap 9 communicating with outside air is formed between the partition wall 52 and the rear end surface of the ink storage body 3. The gap 9 is communicated with the outside air through the air passage 10.

-Communication pipe The flow path 62 is provided in the inside of each of the communication pipes 6 in the axial direction, and the flow paths 62 are opened at both ends of each of the communication pipes 6. The front ends of the communication pipes 6 are opened in front of the ink storage body 3, and the rear ends of the communication pipes 6 are opened in the ink tank 7 behind the ink storage body 3. The front end of each of the communication pipes 6 is a plane perpendicular to the axis. In the plurality of communication pipes 6, one communication pipe 6 b protrudes rearward from the rear surface of the partition wall, and the rear end of the communication pipe 6 b is positioned in the ink tank 7, while the other communication pipe 6 a is connected to the partition wall 52. It does not protrude rearward from the rear surface (that is, the rear end of the other communication pipe 6a coincides with the rear surface of the partition wall 52). Since the plurality of communication pipes 6 are arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent pipes 6 are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. A flow passage 62 is provided in parallel.

The front end of each of the communication pipes 6 is inserted forward by being inserted from the rear end of the ink storage body 3, and finally is positioned in the vicinity of the rear end of the pen tip 2 in front of the ink storage body 3. When the front ends of the communication pipes 6 are inserted into the ink storage body 3, the front ends of the communication pipes 6 press and compress the fibers of the ink storage body 3 forward. Thereby, the fiber density of the ink storage body 3 in the vicinity of the front end of each communication pipe 6 is set higher than the fiber density of the ink storage body 3 in a portion other than the vicinity of each front end of the communication pipe 6. That is, a high-density portion 31 having a high fiber density (a high-density portion 31 having a high capillary force) and a low-density portion 32 having a low fiber density (a low-density portion 32 having a low capillary force) are formed inside the ink occlusion body 3. The Since the front end of each of the communication pipes 6 is located in front of the ink storage body 3, the high density portion 31 is formed in front of the ink storage body 3, and A density portion 32 is formed. Each of the communication pipes 6 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 6 is positioned inside the high density part 31 ahead of the low density part 32. In the present embodiment, the porosity (porosity) of the low density portion 32 is set to 85% to 93%, and the porosity of the high density portion 31 is greater than the porosity of the low density portion 32. Also, the difference between the porosity of the low density portion 32 and the porosity of the high density portion 31 is set to 20%.

The front end of each of the communication pipes 6 is disposed at a position that is radially outward from the axis of the ink storage body 3. Specifically, the front ends of the communication pipes 6 are arranged at equal intervals on the same circumference centered on the axis of the ink storage body 3. In the present embodiment, since there are two communication pipes 6, the communication pipes 6 are arranged at 180 ° symmetrical positions with respect to the axis of the ink occlusion body 3. Since the nib 2 is located at the axial center of the ink occlusion body 3, the front end of each of the communication pipes 6 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The ink occluding body 3 is connected through the inside front (high density portion 31) so that ink can be distributed. Further, the front end of each of the communication pipes 6 is located slightly behind the rear end of the pen tip 2. That is, the front end of each communicating pipe 6 and the rear end of the pen tip 2 are connected to the high density portion 31 of the ink occlusion body 3.

In the present embodiment, the axial length L of the entire ink occlusion body 3 is set to 30 mm. In the present embodiment, the axial distances S1 and S2 from the front end of the ink occlusion body 3 to the front ends of the communication pipes 6 are both set to 4 mm. Therefore, the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 6 are 13.3% of the axial length L of the entire ink storage body 3 (that is, 3). % To 50%). In the present embodiment, the axial distances T1 and T2 between the front end of each of the communication pipes 6 and the rear end of the pen tip 2 are both set to 1 mm (that is, within 10 mm).

Ink tank The ink tank 7 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding or blow molding of a synthetic resin. Ink 8 is stored directly in the ink tank 7. The ink 8 stored in the ink tank 7 may be either water-based ink or oil-based ink.

The front end opening of the ink tank 7 is detachably attached to the intermediate member 5. When ink 8 in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the intermediate member 5 and the ink tank 7 is filled with the ink 8 or filled with the ink 8 After the new ink tank 7 is replaced, the ink tank 7 filled with the ink 8 is attached to the intermediate member 5. Thereby, writing becomes possible again.

In the present embodiment, the volume V2 of the ink occlusion body 3 is set to 50% to 70% of the volume V1 of the space formed by the ink tank 7 and the communication pipes 6.

Further, the direct liquid writing instrument 1 of the present embodiment includes a detachable cap (not shown) on the pen tip 2 side. By mounting the cap on the pen tip 2 side, the pen tip 2 and the front end opening of the air passage 10 are sealed, and the communication between the ink tank 7 and the outside air is blocked.

(Second Embodiment)
FIG. 3 shows a second embodiment of the present invention.
The present embodiment is a modification of the first embodiment, and the difference from the first embodiment is that the front outer peripheral surface of the ink storage body 3 is pressed and compressed radially inward. The point where the high density portion 31 is formed in the front portion of the ink occlusion body 3 and the point where each front end of the communication tube 6 is sharpened (specifically, each front end surface of the communication tube 6 is composed of an inclined cut surface 61. Point).

The plurality of ribs 43 formed on the inner surface of the large-diameter portion 42 of the tip member 4 are set such that the diameter of the inscribed circle is relatively smaller than the outer diameter of the front portion of the ink storage body 3. The ink occlusion body 3 has a uniform density distribution in the front-rear direction before being pressed into the tip member 4. When the front portion of the ink storage body 3 is press-fitted into the large diameter portion 42 of the tip member 4, the front outer peripheral surface of the ink storage body 3 is pressed and compressed radially inward by the rib 43, As a result, the high density portion 31 is formed in the front portion of the ink occlusion body 3. At the same time, the low density portion 32 is formed behind the high density portion 31 because the outer peripheral surface of the ink occlusion body 3 is not compressed in the radial direction. Since the front end of each of the communication pipes 6 and the rear end of the pen tip 2 are positioned inside the rib 43 on the inner surface of the large diameter portion 42, the vicinity of the front end of each of the communication pipes 6 and the pen tip 2. The high density portion 31 can be appropriately formed in the vicinity of the rear end.

Each of the communication pipes 6 has a front end formed of one inclined cut surface 61 and is sharpened. Thereby, the piercing insertion property of each communication pipe 6 into the ink storage body 3 is improved, the opening area of the front end opening of each communication pipe 6 is increased, and the ink supply into the ink storage body 3 is quickly performed. Can be. The inclined cut surface 61 at the front end of each of the communication pipes 6 is formed to include the front end opening of each of the communication pipes 6. The inclined cut surface 61 (that is, the front end opening of the communication pipe 6) faces the axial direction of the ink storage body 3 (that is, the rear end direction of the pen tip 2). As a result, ink can be quickly supplied to the rear end of the nib 2, and the fibers near the rear end of the nib 2 are pressed and compressed toward the rear end of the nib 2 by the front end of the communication pipe 6. The fiber density in the vicinity can be easily set high. In the present embodiment, the cross sections of the outer surface and the inner surface of each of the communication pipes 6 are circular like the first embodiment, and the outer peripheral edge and the inner peripheral edge of each front end of the communication pipe 6 are inclined. The cut surface 61 has an elliptical shape. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

(Third embodiment)
FIG. 4 shows a third embodiment of the present invention.
The present embodiment is a modification of the first embodiment, and is different from the first embodiment in that the front end surface of the ink storage body 3 is pressed and compressed rearward so that the ink storage body 3 The point where the high-density part 31 is formed in the front part, and the point where each front end of the communication pipe 6 is sharpened as in the second embodiment (specifically, each front end surface of the communication pipe 6 is inclined cut) Point).

A protruding wall 43c that protrudes rearward is formed integrally with the restriction wall 43a of the plurality of ribs 43 formed on the inner surface of the tip member 4. The ink occlusion body 3 has a uniform density distribution in the front-rear direction before being pressed into the tip member 4. When the front portion of the ink storage body 3 is inserted into the large diameter portion 42 of the tip member 4, the entry portion 43 c is inserted deeply into the front end surface of the ink storage body 3, and the front end surface of the ink storage body 3 is inserted. Is pressed and compressed rearward, whereby a high density portion 31 is formed at the front portion of the ink occlusion body 3. At the same time, the low density portion 32 is formed behind the high density portion 31 because the outer peripheral surface of the ink occlusion body 3 is not pressed and compressed. Since the rear end of the protrusion 43c is positioned in the vicinity of the front end of each of the communication pipes 6 and in the vicinity of the rear end of the pen tip 2, the rear ends of the penetrating parts 43c The density part 31 can be formed appropriately. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

(Fourth embodiment)
FIG. 5 shows a fourth embodiment of the present invention.
This embodiment is a modification of the first embodiment, and is different from the first embodiment in that the ink storage body 3 and the first ink storage body constituting the high-density portion 31 are low in density. The point which consists of the 2nd ink occlusion body which comprises the part 32, and the point which sharpened each front end of the communicating pipe 6 similarly to 2nd Embodiment (specifically each front end of each communicating pipe 6) The surface is a point formed by the inclined cut surface 61).

The fiber density of the first ink occlusion body is set high in advance, and the fiber density of the second ink occlusion body is set lower than the fiber density of the first ink occlusion body in advance. The rear end surface of the first ink occlusion body and the front end surface of the second ink occlusion body are arranged in contact with each other. Each of the communication pipes 6 penetrates through the second ink storage body in the axial direction, and the front end of each of the communication pipes 6 is pierced and connected to the first ink storage body from the rear to the front. Also, the rear end of the pen tip 2 is pierced and connected to the first ink storage body from the front to the rear. Accordingly, the high density portion 31 is appropriately positioned in the vicinity of each front end of the communication pipe 6 and in the vicinity of the rear end of the pen tip 2. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

(Fifth embodiment)
FIG. 6 shows a fifth embodiment of the present invention.
This embodiment is a modification of the first embodiment, and is different from the first embodiment in that an ink absorber 63 made of a fiber processed body is placed in the flow passage 62 of each communication pipe 6. It is the point which accommodated. The fiber density (capillary force) of the ink absorber 63 is set smaller than the fiber density (capillary force) of the high density portion 31 of the ink occlusion body 3. By accommodating the ink absorber 63 in the communication pipe 6, the front end opening of the communication pipe 6 can be properly liquid-sealed even if the outer diameter and inner diameter of the communication pipe 6 are set to be relatively large. As a result, the outer diameter and inner diameter of the communication pipe 6 can be set thick, which is advantageous for preventing the communication pipe 6 from being bent. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

(Sixth embodiment)
7 and 8 show a sixth embodiment of the present invention.
This embodiment is a modification of the first embodiment, and is different from the first embodiment in that the side walls of the respective communication pipes 6 are integrally connected to each other by plate-like ribs 64 extending in the axial direction. The point which sharpened the front end of each communicating pipe | tube 6 similarly to 2nd Embodiment (specifically the point which each front-end surface of the communicating pipe | tube 6 consists of the inclined cut surface 61). Since the side walls of the respective communication pipes 6 are integrally connected to each other by the plate-like ribs 64 extending in the axial direction, the bending strength of the respective communication pipes 6 is improved, and stable piercing insertion into the ink storage body 3 is obtained. It is done. Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

FIG. 9 shows another example of the communication pipe 6.
This is another example in which the side walls of the communication pipe 6 are connected to each other. In other words, in this example, the inside of one cylindrical body is partitioned by a partition wall extending in the longitudinal direction, or in other words, crosses the two communication pipes 6a and 6b having a semicircular cross section. It is the structure connected integrally so that it may become a surface circle shape. As a result, two flow passages 62 having a semicircular cross section are provided independently inside the cylindrical body.

FIG. 10 shows another example of the communication pipe 6.
This is an example of a configuration in which a small-diameter communication pipe 6b is disposed inside a large-diameter communication pipe 6a. In this example, an annular flow passage 62 is formed between the inner peripheral surface of the large-diameter communication pipe 6a and the outer peripheral surface of the small-diameter communication pipe 6b, and a circular cross-section is formed inside the small-diameter communication pipe 6b. The flow path 62 is formed. The rear end of the large-diameter communication pipe 6 a does not protrude rearward from the rear surface of the partition wall 52, and the rear end of the small-diameter communication pipe 6 b protrudes rearward from the rear surface of the partition wall 52 and is positioned in the ink tank 7.

(Seventh embodiment)
A direct liquid writing instrument 1 according to a seventh embodiment of the present invention is shown in FIGS.
The direct liquid writing instrument 1 according to the present embodiment includes a nib 2, an ink occlusion body 3 connected to the rear end of the nib 2, an intermediate member 5 disposed behind the ink occlusion body 3, and the An ink tank 7 disposed behind the intermediate member 5, and a shaft cylinder 11 that holds the pen tip 2 at the front end and accommodates the ink occlusion body 3, the intermediate member 5, and the ink tank 7 therein. The tail plug 12 is detachably screwed into the rear end opening of the shaft tube 11 and the cap 13 is detachably provided on the pen tip 2 side.

Pen nib The nib 2 is a rod-like body obtained by resin processing of synthetic resin fibers (for example, polyester fibers, acrylic fibers, nylon fibers, etc.). The front end of the nib 2 is ground like a bullet. The outer peripheral surface of the rear end portion of the nib 2 is chamfered in a tapered shape.

Ink occlusion body The ink occlusion body 3 is made of a processed body of cylindrical synthetic resin fibers (for example, polyester fibers). The outer peripheral surface of the ink occlusion body 3 is covered with a cylindrical outer skin. The outer skin is made of a synthetic resin film (for example, a polyethylene terephthalate film). The rear end of the pen tip 2 is inserted into the axial center of the front end surface of the ink storage body 3 and the rear end of the pen tip 2 is positioned in front of the ink storage body 3.

-Shaft tube The shaft tube 11 is a tubular body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The shaft cylinder 11 includes a tip 111 that holds the outer peripheral surface of the nib 2, and a main body 112 that is connected to the rear of the tip 111 and that accommodates the ink storage body 3, the partition wall 52, and the ink tank 7. Become.

A plurality of ribs 113 extending in the front-rear direction are integrally formed on the inner surface of the shaft cylinder 11 (that is, from the inner surface of the tapered portion 111 to the inner surface of the front portion of the main body portion 112). In the rib 113, a step-shaped regulation wall portion 113 a is formed in the vicinity of the connection portion between the tapered portion 111 of the shaft tube 11 and the main body portion 112. The front end surface of the ink occlusion body 3 abuts against the restriction wall portion 113a in the axial direction, and the outer peripheral surface of the ink occlusion body 3 is pressed and held by the rib 113 on the inner surface of the front portion of the main body portion 112. The outer peripheral surface of the nib 2 is pressed and held by the rib 113 on the inner surface of the tapered portion 111. A cylindrical wall portion 113b is integrally formed between a portion of the rib 113 that holds the outer peripheral surface of the pen nib 2 and a portion that holds the outer peripheral surface of the ink occlusion body 3.

By the rib 113, between the outer peripheral surface of the ink occlusion body 3 and the inner surface of the main body portion 112, between the front end surface of the ink occlusion body 3 and the inner surface of the shaft cylinder 11, and between the outer peripheral surface of the pen tip 2 and the inner surface of the taper 111. In between, the air passage 10 is formed. The front side of the air passage 10 is opened to the outside from the front end of the shaft cylinder 11, and the rear side of the air passage 10 communicates with the rear end surface of the ink occlusion body 3. That is, the air passage 10 communicates the front end surface of the ink storage body 3 and the rear end surface of the ink storage body 3 with the outside air.

Intermediate member The intermediate member 5 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 5 includes a partition wall 52 that partitions the ink storage body 3 and the ink tank 7, and a plurality of intermediate members that protrude forward from the front surface of the partition wall 52 and are pierced and connected to the inside of the ink storage body 3 (specifically 2) communication pipes 6, a connecting pipe 54 that protrudes rearward from the rear surface of the partition wall 52 and is inserted into the front end opening of the ink tank 7, and an axial direction from the front surface or rear surface of the partition wall 52. And a mounting tube portion 55 that protrudes and is fixed to the inner surface of the shaft tube 11 (the inner surface of the main body portion 112). The ink occlusion body 3 is accommodated in a space (that is, the occlusion body accommodation portion) formed by the shaft cylinder 11 and the partition wall 52. The mounting cylinder portion 55 surrounds the outer periphery of the base portion of each communication pipe 6 in front of the partition wall 52 or the outer periphery of the connection pipe 43. A notch is formed at the rear end of the connection pipe 54. Due to the notch, a protruding piece 54a for pressing one side of the plug 71 is integrally formed at the rear end of the connecting pipe 54. The partition wall 52 has a disk shape, and each of the communication pipe 6, the connection pipe 54, and the attachment cylinder portion 55 has a cylindrical shape. The projecting piece 54a has a circular cross-sectional shape.

The partition wall 52, the respective communication pipes 6 (that is, the communication pipe 6a and the communication pipe 6b), the connection pipe 54, and the mounting cylinder portion 55 are integrally connected. That is, the intermediate member 5 allows the partition wall 52, the communication pipe 6, the connection pipe 54, and the mounting cylinder portion 55 to be configured as one part.

As shown in FIG. 13 (1), an abutting wall portion 52 b made of a plate-like rib is integrally formed on the front surface of the partition wall 52. The abutting wall portion 52b is brought into contact with the rear end surface of the ink storage member 3. A gap 9 communicating with the outside air is formed between the partition wall 52 and the rear end surface of the ink occluding body 3 by the contact wall portion 52b. The gap 9 is communicated with the outside air through the air passage 10. A part of the abutting wall portion 52b is formed between the base portions of the communication pipes 6, and the base side walls of the communication pipes 6 are connected. Thereby, the bending strength of each communication pipe 6 is improved, and the bending of each communication pipe 6 with respect to the partition wall 52 can be suppressed. The abutting wall portion 52b is formed in a branched shape, a radial shape, or a cross shape in cross section.

-Communication pipe The flow path 62 is provided in the inside of each of the communication pipes 6 in the axial direction, and the flow paths 62 are opened at both ends of each of the communication pipes 6. The front end of each of the communication pipes 6 is located inside the ink storage body 3 and is opened in front of the ink storage body 3. The rear end of each of the communication pipes 6 is opened in the ink tank 7 behind the ink storage body 3. In the plurality of communication pipes 6, one communication pipe 6b protrudes rearward from the rear surface of the partition wall 52, and the rear end of the communication pipe 6b is located in the ink tank 7 (in the connection pipe 54). The other communication pipe 6a does not protrude rearward from the rear surface of the partition wall 52 (that is, the rear end of the other communication pipe 6a coincides with the rear surface of the partition wall 52). Since each of the communication pipes 6 is arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent circulations are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. A path 62 is provided in parallel. Each flow passage 62 of the communication pipe 6 is penetrated to a location away from the axis of the partition wall 52 located in the connection pipe 54.

The position in the front-rear direction of the rear end of the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 substantially coincides with the rear end of the connection pipe 54 (that is, the rear end of the projecting piece 54a) or the rear of the connection pipe 54. It is positioned slightly forward from the end (that is, the rear end of the protruding piece 54a). That is, the rear end of the communication pipe 6b that protrudes rearward from the rear surface of the partition wall 52 is not greatly protruded rearward from the rear end of the connection pipe 54 (that is, the rear end of the protruding piece 54a). Further, the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is disposed close to the inner surface of the protruding piece 54a. Specifically, the communication pipe 6b protruding rearward from the rear surface of the partition wall 52 is disposed between the axial center of the connection pipe 54 and the inner surface of the protruding piece 54a.

The front end of each of the communication pipes 6 is inserted forward from the rear end of the ink storage body 3 and is finally positioned near the rear end of the pen tip 2 inside the ink storage body 3. When the front ends of the communication pipes 6 are inserted into the ink storage body 3, the front ends of the communication pipes 6 press and compress the fibers of the ink storage body 3 forward. Thereby, the fiber density of the ink storage body 3 in the vicinity of the front end of each communication pipe 6 is set higher than the fiber density of the ink storage body 3 in a portion other than the vicinity of each front end of the communication pipe 6. That is, a high-density portion 31 having a high fiber density (a high-density portion 31 having a high capillary force) and a low-density portion 32 having a low fiber density (a low-density portion 32 having a low capillary force) are formed inside the ink occlusion body 3. The The high density portion 31 is formed in front of the ink occlusion body 3, and the low density portion 32 is formed behind the high density portion 31. The high density portion 31 and the low density portion 32 are connected. Each of the communication pipes 6 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 6 is positioned inside the high density part 31 ahead of the low density part 32. In the present embodiment, the porosity (porosity) of the low density portion 32 is set to 85% to 93%, and the porosity of the high density portion 31 is greater than the porosity of the low density portion 32. Also, the difference between the porosity of the low density portion 32 and the porosity of the high density portion 31 is set to 20%.

The front end of each of the communication pipes 6 is disposed at a position that is radially outward from the axis of the ink storage body 3. Specifically, the front ends of the communication pipes 6 are arranged at equal intervals on the same circumference centered on the axis of the ink storage body 3. In the present embodiment, since there are two communication pipes 6, the communication pipes 6 are arranged at 180 ° symmetrical positions with respect to the axis of the ink occlusion body 3. Since the nib 2 is located at the axial center of the ink occlusion body 3, the front end of each of the communication pipes 6 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The ink occluding body 3 is connected through the inside front (high density portion 31) so that ink can be distributed. Further, the front end of each of the communication pipes 6 is located slightly behind the rear end of the pen tip 2.

-Axial distance In the present embodiment, the axial length of the entire ink occlusion body 3 is set to 28 mm. In the present embodiment, the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 6 are both set to 14 mm. In the present embodiment, axial distances T1 and T2 between the front end of each of the communication pipes 6 and the rear end of the pen tip 2 are both set to 3 mm (ie, within 10 mm).

Ink tank The ink tank 7 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding or blow molding of a synthetic resin. Ink 8 is stored directly in the ink tank 7. The ink 8 stored in the ink tank 7 may be either water-based ink or oil-based ink.

The outer surface of the connecting pipe 54 of the intermediate member 5 is detachably fitted to the inner surface of the front end opening of the ink tank 7. When ink 8 in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the connection pipe 54, and the connection pipe 54 is installed in the front end opening of a new ink tank 7 filled with the ink 8 inside. Insert it. Thereby, writing becomes possible again. A front end opening of the new ink tank 7 is closed by a plug 71. Specifically, a plug 71 is fitted on the inner surface of the front end opening of the ink tank 7. When the connection pipe 54 is inserted into the front end opening of the ink tank 7, one side of the plug body 71 is pressed backward by the protruding piece 54 a of the connection pipe 54, the plug body 71 is removed, and the front end opening of the ink tank 7 is removed. Is opened. Here, as the plug body 71, a disk-shaped plug body 71 made of an injection molded body of synthetic resin is employed. A spherical plug can be used instead of the disk-shaped plug 71.

In the present embodiment, the volume V2 of the ink occlusion body 3 is set to 50% to 70% of the volume V1 of the space formed by the ink tank 7 and the communication pipes 6.

Cap The cap 13 is detachably provided on the pen tip 2 side. By attaching the cap 13 to the pen tip 2 side, the pen tip 2 and the front end opening of the air passage 10 are sealed, and the communication between the ink tank and the outside air is blocked.

(Eighth embodiment)
A direct liquid writing instrument 1 according to an eighth embodiment of the present invention is shown in FIGS.
The present embodiment is a modification of the seventh embodiment, and is different from the seventh embodiment in that each inner surface of the communication pipe 6 (specifically, the communication pipe 6 opening forward in the axial direction). The flow regulating portion 66 (specifically, an annular protrusion) is provided on the inner surface of each front end opening. The flow rate restricting unit 66 can further suppress the ink 8 in the ink tank 7 from being blown to the outside when a sudden pressure change occurs in the pen tip downward state. Since the configuration other than the above is the same as that of the seventh embodiment, the description thereof is omitted.

It is a longitudinal cross-sectional view which shows the pen tip downward state of the 1st Embodiment of this invention. It is the sectional view on the AA line of FIG. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 4th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 5th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 6th Embodiment of this invention. It is the BB sectional view taken on the line of FIG. It is a cross-sectional view showing an example of another communication pipe. It is a cross-sectional view showing an example of another communication pipe. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 7th Embodiment of this invention. (1) is an enlarged sectional view taken along the line CC of FIG. 11, (2) is an enlarged sectional view taken along the line DD of FIG. 11, and (3) is an enlarged sectional view taken along the line EE of FIG. (1) is the FF line expanded sectional view of FIG. 11, (2) is the GG line expanded sectional view of FIG. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 8th Embodiment of this invention. (1) is the HH line expanded sectional view of FIG. 14, (2) is the II sectional enlarged view of FIG. 14, (3) is the JJ expanded sectional view of FIG. (1) is the KK line expanded sectional view of FIG. 14, (2) is the LL line expanded sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Direct liquid type writing instrument 2 Pen tip 21 Annular groove 3 Ink occlusion body 31 High density part (1st ink occlusion body)
32 Low density part (second ink occlusion body)
4 Tip member 41 Small diameter part 42 Large diameter part 43 Rib 43a Restriction wall part 43b Locking convex part 43c Entry part 5 Intermediate member 51 Front cylinder part 52 Partition 53 Rear cylinder part 54 Connection pipe 54a Projection piece 55 Attachment cylinder part 6 Communication pipe 61 Inclined cut surface 62 Flow path 63 Ink absorber 64 Rib 66 Flow rate restricting part 6a Communication pipe 6b Communication pipe 7 Ink tank 8 Ink 9 Crevice 10 Air path 11 Shaft cylinder 111 Tip 112 Body part 113 Rib 113a Restriction wall part 113b Tube Shaped wall portion 12 Tail plug 13 Cap L Length in the axial direction of the entire ink occlusion body S1, S2 Distance in the axial direction from the front end of the ink occlusion body to the front end of the communication tube T1, T2 After the front end of the communication tube and the pen tip Axial distance to end

Claims (9)

A pen tip, an ink occlusion body connected to the rear end of the pen nib, an ink tank that is disposed behind the ink occlusion body and directly stores ink, and between the ink tank and the ink occlusion body A direct liquid type writing instrument comprising a plurality of communication pipes, each having a plurality of communication pipes, provided with a partition wall between an ink storage body and an ink tank, and projecting each of the communication pipes forward from the front surface of the partition wall. And the front end of each of the communication pipes is located inside the ink occluding body, the ink occluding body comprising a high density portion and a low density portion connected to the rear of the high density portion, the high density portion The front end of each of the communication pipes and the rear end of the pen tip are positioned, at least one communication pipe protrudes rearward from the rear surface of the partition wall, and the rear end of the communication pipe is positioned inside the ink tank. A direct liquid writing instrument. 2. The direct liquid writing instrument according to claim 1, wherein each of the communication pipes penetrates through the inside of the low density part, and a front end of each of the communication pipes and a rear end of the nib are located in the high density part. . When the front end of each communication pipe is inserted from the rear end of the ink storage body, the front end of each of the communication pipes presses and compresses the inside of the ink storage body forward, so that the ink in the vicinity of each front end of the communication pipe The direct liquid writing instrument according to claim 1 or 2, wherein the high-density portion is formed inside the occlusion body. The direct liquid writing instrument according to claim 1, 2 or 3, wherein the high density portion is formed by pressing and compressing the outer surface of the ink occlusion body inward in the radial direction. The direct liquid writing instrument according to claim 1, 2, 3, or 4, wherein the high-density portion is formed by pressing and compressing the front end face of the ink occlusion body backward. The ink occlusion body is composed of a first ink occlusion body set at a high density and a second ink occlusion body set at a low density, and the first ink occlusion body constitutes the high density portion. The direct liquid writing instrument according to claim 1, wherein the second ink occlusion body constitutes the low density portion. The front end opening of the ink tank before opening is closed with a plug, the connecting pipe protrudes behind the rear surface of the partition wall, the connecting pipe is inserted into the front end opening of the ink tank, and the connecting pipe is The ink tank is opened by pressing a plug, and a communication pipe protruding rearward from the rear surface of the partition wall is located inside the connection pipe, and a communication pipe protruding rearward from the rear surface of the partition wall. The rear end of the connecting pipe is located in front of the rear end of the connection pipe, or the rear end of the communication pipe protruding rearward from the rear surface of the partition wall is substantially coincident with the rear end of the connection pipe. Item 7. The direct liquid writing instrument according to any one of Items 1 to 6. A projecting piece that presses one side of the plug body when the ink tank is opened is provided on one side of the rear end of the connecting pipe, and the outer surface of the communication pipe projecting rearward from the rear surface of the partition wall is brought close to the inner surface of the projecting piece. The direct liquid writing instrument according to claim 7. The direct liquid writing instrument according to any one of claims 1 to 8, wherein a volume of the ink occlusion body is set to 40% or more of a volume of a space formed by the ink tank and each of the communication pipes.

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