JP2008023755A - Direct liquid type writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct liquid type writing utensil, which has no fear of leaking the ink in an ink tank from a penpoint side and, in addition, in which air interchanges with the ink quickly at an initial ink feed, resulting in making writing possible in a short period of time and further enabling to obtain an abundant ink outflowability from a penpoint. <P>SOLUTION: This direct liquid type writing utensil 1 consists of a penpoint 2, an ink occluding body 3 connected with the rear end of the penpoint 2, an ink tank 7, which is arranged behind the ink occluding body 3 and directly stores the ink 8, and a plurality of communicating vessels 62 connecting between the ink tank 7 and the ink occluding body 3. The fore end of each of the communicating vessels 62 is open and is positioned within the ink occluding body 3. Axial differences ΔL exist between individual fore end positions of the communicating vessels 62. The axial differences ΔL are set to be at least 15 mm. <P>COPYRIGHT: (C)2008,JPO&INPIT

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 the ink container has a communication hole (communication pipe) 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 inside of 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 body is provided at the front end opening side of the body. 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. 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.

Since the direct liquid writing instrument of the above-mentioned patent document 2 is configured to supply ink from the liquid supply hole to the rear end surface of the liquid absorbing material on the ink storage chamber side, the ink in the ink storage chamber is stored in the ink from the liquid supply hole. There is a possibility that it cannot be supplied quickly and reliably through the inside of the chamber-side liquid absorbing material to the rear end of the pen tip. As a result, at the time of initial ink ejection (that is, when ink is first supplied from the ink storage chamber to the liquid absorbing material), a considerable time is required until writing becomes possible. Moreover, the direct liquid writing instrument of Patent Document 2 cannot quickly and reliably supply ink in the ink storage chamber from the liquid supply hole to the end surface opening of the air supply pipe through the inside of the liquid absorbing material on the ink storage chamber side. There is a fear. For this reason, it is difficult to reliably close the open end of the air supply pipe with the ink supplied from the liquid supply hole and impregnated in the liquid absorbing material (that is, to make the open end of the air supply pipe liquid-sealed). Ink outflow from the ink and air inflow into the ink storage chamber (that is, replacement of ink and air) cannot be stopped quickly and 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."

The direct liquid writing instrument of Patent Document 3 has a configuration in which an ink tank and an ink absorber are connected only by a single ink conduit, so that air and ink can be written quickly without initial ink replacement. It takes a considerable amount of time to become. 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. Further, the present invention is intended to provide a direct liquid type writing instrument that can write and obtain a sufficient amount of ink outflow from the nib.

(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 occlusion 3 and directly storing ink 8, A direct liquid type writing instrument comprising a communication pipe 62 connecting between the ink tank 7 and the ink occlusion body 3, comprising a plurality of the communication pipes 62, each front end of the communication pipe 62 being opened, It is a requirement that the front end of each of the communication pipes 62 is positioned inside the ink storage body 3 and has an axial difference between the front end positions of each of the communication pipes 62 (Configuration 1).

Each of the communication pipes 62 of the direct liquid writing instrument 1 (Configuration 1) has a function of supplying the ink 8 in the ink tank 7 to the inside of the ink occlusion body 3 and a function of supplying outside air to the ink tank 7. With. When supplying the ink 8 in the ink tank 7 to the ink occlusion body 3, when the pen tip 2 is turned downward, the ink 8 in the ink tank 7 passes through at least one communication pipe 62 due to gravity and passes through the ink occlusion body. 3 and impregnated inside the ink occlusion body 3. At the same time, outside air is taken into the ink tank 7 through the other communication pipe 62. That is, in the case of n communication pipes 62 (n is an integer of 2 or more), one or more and (n-1) or less communication pipes 62 supply ink, and the other remaining communication pipes 62 are outside air. Supply.

When the ink 8 impregnated inside the ink occlusion body 3 reaches a certain amount, the front end opening of the other communication pipe 62 that has taken in the outside air is in a liquid-sealed state with the impregnating ink, and is temporarily closed, 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 62 that has been supplying the ink is also stopped. As a result, each front end opening of the communication pipe 62 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.

The direct liquid writing instrument 1 (Configuration 1) has a configuration in which the front ends of the communication pipes 62 are positioned inside the ink storage body 3, and therefore, all of the front end openings of the communication pipes 62 are disposed in the ink storage body. 3 can be easily closed by a liquid seal of ink impregnated in the interior of 3. As a result, excessive 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 side.

The direct liquid writing instrument 1 (Configuration 1) includes a plurality of communication pipes 62 (that is, two or more), so that when at least one of the communication pipes 62 supplies ink, Air supply will be performed. 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 axial difference between the front end positions of the communication pipes 62 so that the front end openings of the communication pipes 62 are located in the ink occlusion body 3. When the liquid is sealed with the impregnated ink, a relatively large amount of ink can be impregnated in the ink occlusion body 3. As a result, sufficient ink outflow from the nib 2 is obtained. In addition, when the said communication pipe 62 has three or more, the axial difference between each front-end position of the said communication pipe 62 should just have at least one place.

(Configuration 2)
In the direct liquid writing instrument 1 (Configuration 1), it is preferable that an axial difference ΔL between the front end positions of the communication pipes 62 is set within 15 mm (Configuration 2).

The direct liquid writing instrument 1 (Configuration 2) is configured such that the axial difference ΔL between the front end positions of the communication pipes 62 is set within 15 mm (millimeters), so that abundant ink from the nib 2 is obtained. It is possible to further prevent the ink in the ink tank 7 from leaking from the pen tip side at the same time as obtaining the flowability. If the axial difference ΔL between the front end positions of the communication pipes 62 exceeds 15 mm, when the front end openings of the communication pipes 62 are in a liquid-sealed state by the impregnating ink in the ink storage body 3, Since excess ink is impregnated in the ink storage 3, excess ink accompanying the increase in internal pressure in the ink tank 7 cannot be sufficiently impregnated in the ink storage 3, and ink is leaked to the outside from the pen tip side. There is a fear. In the present invention, for example, when the communication pipe 62 has three or more and the axial difference ΔL between the front end positions of the communication pipe 62 occurs at a plurality of locations, All of the differences ΔL are within 15 mm.

(Configuration 3)
In the direct liquid writing instrument 1 (Configuration 1 or 2), the rear end of the pen nib 2 and the front end of each of the communication pipes 62 are connected via the ink occlusion body 3 so that ink can be circulated. (Configuration 3) is preferable.

In the direct liquid writing instrument 1 (Configuration 3), since the rear end of the pen tip 2 and the front end of each of the communication pipes 62 are not directly connected, at least the rear end of the pen tip 2 and the communication pipe 62 are not connected. A certain amount of ink is impregnated inside the ink occlusion body 3 between each front end. Thereby, even when there is no ink supply from the ink tank 7 such as the pen tip 2 upward state or the writing instrument main body horizontal state, the ink occlusion body between the rear end of the pen tip 2 and the front end of each of the communication pipes 62. 3 The ink can be sufficiently written by the ink impregnated inside.

(Configuration 4)
In the direct liquid writing instrument 1 (configurations 1 to 3), the front end of each of the communication pipes 62 is inserted forward from the rear end of the ink storage body 3, and the inside of the ink storage body 3 is pressed and compressed forward. The density of the ink occluding body 3 in the vicinity of the front end of each of the communication pipes 62 is preferably set higher than the density of the ink occluding body 3 in portions other than the vicinity of the front end of each of the communication pipes 62 (Configuration 4). .

In the direct liquid writing instrument 1 (configuration 4), the ink occlusion body 3 has a portion where the density in the vicinity of each front end of the communication pipe 62 is set high (high density portion 31), and the vicinity of the front end of each of the communication pipes 62 And a portion (low density portion 32) in which the density is set low. That is, at least in the vicinity of the front end of each communication pipe 62 inside the ink occlusion body 3, the high density portion 31 in which the density of the ink occlusion body 3 is set high is provided. 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 62 can be reliably liquid-sealed by the impregnating ink in the ink storage body 3. 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 31 is returned to the ink tank 7 appropriately through the communication pipe 62. The high-density portions 31 in the vicinity of the front ends of the communication pipes 62 are preferably close to each other, but may be separated from each other.

Further, the direct liquid writing instrument 1 (configuration 4) has a difference in density between the ink occluding bodies 3 (that is, the high density portion 31 and the low density portion 32 of the ink occluding body 3), and the front end of each communication pipe 62 is connected to the ink occlusion body 3. Since the inside of the ink storage body 3 is inserted forward from the rear end of the storage body 3 and is pressed and compressed forward, the density is previously stored in the ink storage body 3 before the communication pipe 62 is incorporated into the ink storage body 3. There is no need to provide a difference, and manufacturing becomes extremely easy. In the configuration 4, it is preferable that the rear end of the nib 2 is connected to the high-density portion 31 in the vicinity of the front end of at least one communication pipe 62 in the ink storage body 3.

(Configuration 5)
In the direct liquid writing instrument 1 (configuration 4), it is preferable that the axial lengths L1 and L2 of the portions inserted into the ink storage bodies 3 of the communication pipes 62 are 3 mm or more (configuration 5). .

In the direct liquid writing instrument 1 (Configuration 5), the axial lengths L1 and L2 of the portions inserted into the ink storage bodies 3 of the communication pipes 62 are all 3 mm (millimeters) or more. By reliably pressing and compressing the ink storage bodies 3 by inserting the communication pipes 62, the high-density portion 31 can be reliably formed in the vicinity of the front end of the communication pipe 62 inside the ink storage body 3, and the front ends of the respective communication pipes 62. A stable liquid seal state of the opening is obtained. If at least one of the lengths L1 and L2 in the axial direction of the portions inserted into the ink storage bodies 3 of the communication pipes 62 is less than 3 mm, the liquid seals at the front end openings of the communication pipes 62 are provided. The state becomes unstable, and the liquid seal state collapses when the cap is attached / detached or a slight impact occurs. The outside air enters the ink tank 7 from the front end opening of one of the communication pipes 62, and the ink in the ink tank 7 absorbs the ink. There is a possibility that ink is excessively supplied to the inside of the body 3 and the ink leaks from the pen tip side.

In the configuration 4 or 5, the front end of each of the communication pipes 62 may have a sharp shape. Thereby, each communicating pipe 62 can be smoothly pierced and inserted from the rear end of the ink storage body 3. Further, in the configuration in which each front end of the communication pipe 62 is sharpened, it is preferable that each front end of the communication pipe 62 has an inclined cut surface including a front end opening. As a result, the insertion property of each communicating pipe 62 into the ink storage body 3 is further improved, and the opening area of the front end opening of each communicating pipe 62 is increased, so that the inside of the ink storage body 3 can be increased. The ink can be supplied quickly.

(Configuration 6)
In the direct liquid writing instrument 1 (Configurations 1 to 5), it is preferable that the front end surface and the rear end surface of the ink occlusion body 3 communicate with outside air (Configuration 6).

The direct liquid writing instrument 1 (configuration 6) 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 62 inside the ink storage body 3 is passed from the vicinity of the front end of the communication pipe 62 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 62 can be smoothly moved from the inside of the ink occlusion body 3 toward the rear end of the ink occlusion body 3. In particular, since the rear end surface of the ink storage body 3 communicates with the outside air, when the pressure in the ink tank 7 increases due to a temperature rise or the like, the ink pushed out of the ink tank 7 smoothly flows from the front end of the communication pipe 62. The ink occlusion body 3 moves rearward through the vicinity of the front end of the communication pipe 62 and is impregnated in the ink occlusion body 3 behind the front end of the communication pipe 62 to prevent leakage of the ink to the outside. When the pressure in the ink tank 7 decreases due to the ink, the impregnated ink in the ink storage body 3 behind the front end of the communication pipe 62 is passed through the vicinity of the front end of the communication pipe 62 inside the ink storage body 3 and the front end opening of the communication pipe 62 Further, the ink can be returned to the ink tank 7 through the communication pipe 62.

In the configuration 6, a partition wall 61 is provided between the ink storage body 3 and the ink tank 7, and each communication pipe 62 projects forward from the front surface of the partition wall 61 so that the front surface of the partition wall 61 and the rear end surface of the ink storage body 3 are provided. It is preferable to provide a gap 9 that communicates with outside air. Further, in the configuration in which the gap 9 communicating with the outside air is provided, it is preferable to form a contact wall portion 61 a that can contact a part of the rear end surface of the ink storage body 3 on the front surface of the partition wall 61. Furthermore, in the structure which forms the said contact wall part 61a, in order to prevent the bending of the communication pipe 62, it is preferable to connect the said contact wall part 61a to the side wall of the communication pipe 62. FIG.

In the present invention, it is preferable that at least one of the front ends of the communication pipe 62 is positioned in the vicinity of the rear end of the pen tip 2 inside the ink occlusion body 3. As a result, ink can be quickly supplied to the pen tip 2 from the front end opening of the communication pipe 62 positioned in the vicinity of the rear end of the pen tip 2 inside the ink occlusion body 3. As a result, writing can be performed reliably in a short time when the initial ink is dispensed.

In the present invention, the minimum distance in the axial direction between the front end of the communication tube 62 closest to the rear end of the pen tip 2 and the rear end of the pen tip 2 among the plurality of communication tubes 62 is 10 mm (millimeters). It is preferable to set within. Thereby, at the time of initial ink ejection, ink is rapidly supplied from the front end of the communication pipe 62 closest to the rear end of the nib 2 to the rear end of the nib 2 and writing can be performed in a short time. The front end of the communication pipe 62 closest to the rear end of the nib 2 may be located in front of the rear end of the nib 2, or may be located behind the rear end of the nib 2. Good.

In the present invention, at least one of the front ends of the communication pipe 62 is positioned in front 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. preferable. Thereby, the longitudinal dimension of the entire nib 2 can be set short. As a result, abundant ink from the ink tank 7 is supplied to the rear end of the pen tip 2 through the inside of the ink occlusion body 3 through the communication pipe 62, and then quickly to the front end of the pen tip 2. Since the ink is supplied, smooth ink outflow from the nib 2 is obtained without any interruption in the handwriting or blurring of the handwriting. Moreover, since the longitudinal dimension of the entire nib 2 can be set short, the cost of the nib 2 can be reduced at a low cost.

In the present invention, the side walls of the communication pipe 62 are preferably connected to each other. Thereby, the bending strength of each communication pipe 62 is improved, and the bending of each communication pipe 62 can be suppressed. Further, it is preferable that the side walls of the communication pipe 62 are connected to each other by a rib extending in the axial direction, and the rib serves as a contact wall portion 61 a that can contact a part of the rear end surface of the ink storage body 3. Thereby, the shakiness in the axial direction of the ink occlusion body 3 can be suppressed, and a reliable gap 9 that can communicate with the outside air can be formed between the rear end surface of the ink occlusion body 3 and the partition wall 61.

In the present invention, an ink absorber having a capillary gap may be disposed inside each of the communication pipes 62. Thereby, even when the outer diameter and the inner diameter of each communication pipe 62 are set to be relatively large in order to suppress the bending of the communication pipe 62, an appropriate liquid seal can be obtained at the front end opening of the communication pipe 62. The ink absorber is not limited as long as it has a capillary gap. For example, a porous fiber such as a fiber bundle resin processed body, a fiber bundle heat-sealed processed body, a felt processed body, or a porous foam of synthetic resin. Examples thereof include a material, or an extruded product of a synthetic resin having an axial ink guide path. The capillary force of the ink absorber is preferably set smaller than the capillary force of the vicinity of the front end (high density portion 31) of each of the communicating tubes 62 inside the ink storage member 3.

In the present invention, the communication pipe 62 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 the inner peripheral surface of the communication pipe 62 may be any of, for example, a circle, an ellipse, or a polygon such as a triangle or a quadrangle. Further, the number of the communication pipes 62 may be a plurality (that is, two or more), such as 2, 3, 4, 5, or 6, for example. Each of the communication pipes 62 extends in the front-rear direction, and a flow passage 62a is provided through each of the communication pipes 62 in the front-rear direction. Further, the plurality of communication pipes 62 may be configured so that a plurality of independent flow passages 62a are formed in parallel therein, for example, each of the communication pipes 62 is separated in the radial direction, Examples include a configuration in which the side walls of the communication tube 62 are connected to each other, or a configuration in which the small diameter communication tube 62 is disposed inside the large diameter communication tube 62. The communication pipes 62 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 62 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 of the communication pipes 62 include an inclined cut surface, a vertical surface, a conical surface, and a convex curved surface. The rear end of any one of the communication pipes 62 may protrude rearward from the rear surface of the partition wall 62 and may be positioned in the ink tank 7.

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 the outer peripheral surface thereof. 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.

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 ball-point pen tip, a synthetic resin extrusion having an ink guide path in the axial direction, or a combination thereof. In the present invention, the material constituting the rear end of the nib 2 (ink guiding member) may be at least a member provided with a capillary gap to enable proper connection with the ink occlusion body 3, For example, a fiber bundle resin processed body, a fiber bundle heat-bonded processed body, a felt processed body, a porous material such as a synthetic resin porous foam, or a synthetic resin extrusion molded body having an axial ink guide path Is mentioned. That is, in the present invention, the nib 2 includes an ink guide member.

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.).

The direct liquid writing instrument according to the present invention has no risk of ink leaking from the pen tip side to the outside due to the configuration 1, and the ink and air can be changed quickly at the time of initial ink discharge, so that writing can be performed in a short time. In addition, abundant ink spillability from the nib is obtained.

The direct liquid type writing instrument of the present invention can further prevent the ink in the ink tank from leaking out from the pen tip side at the same time as obtaining a sufficient ink outflow property from the pen tip by the configuration 2.

The direct liquid writing instrument of the present invention has a rear end of the pen nib and the front end of each of the communicating pipes even when there is no ink supply from the ink tank, such as the pen tip upward state or the horizontal state of the writing instrument body. The ink can be sufficiently written by the ink impregnated inside the ink occlusion body.

The direct liquid type writing instrument of the present invention can reliably seal the front end opening of each communicating pipe with the impregnating ink in the ink occlusion body according to the configuration 4, and before incorporating the communicating pipe into the ink occlusion body in advance. There is no need to provide a density difference in the ink occlusion body, and the production becomes extremely easy.

The direct liquid writing instrument of the present invention obtains a stable liquid seal state at the front end opening of each communicating pipe by the configuration 5.

According to the sixth aspect of the present invention, the direct writing type writing instrument allows the ink supplied from the front end opening of the communication pipe inside the ink occlusion body to pass through the ink occlusion body from the vicinity of the front end of the communication pipe inside the ink occlusion body. It can be smoothly moved from the inside of the ink storage near the front end of the communication tube to the rear end of the ink storage.

(First embodiment)
1 and 2 show a direct liquid writing instrument 1 according to a first embodiment of the present invention.
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 nib 2 held at the front end portion, and the ink occlusion body 3 An occlusion body accommodating portion for accommodating the ink, an ink tank 7 which is attached to the rear of the occlusion body accommodating portion and directly stores the ink 8 therein, and the occlusion body accommodating portion and the ink tank 7 are partitioned. The partition 61 includes a plurality of (specifically, two) communication pipes 62 that protrude forward from the front surface of the partition 61 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 6 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 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. An annular groove 21 is formed at the intermediate portion of the nib 2. In addition, the front end of the nib 2 may be ground in a chisel 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 member 3 and the rear end of the pen tip 2 is positioned inside the ink storage member 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.

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), a plurality of ribs 43 extending in the axial direction are integrally formed. 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. The 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 6 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 6 includes a front cylinder portion 65 that opens forward, a partition wall 61 that is formed at the bottom of the front cylinder portion 65, a rear cylinder portion 66 that extends rearward from the partition wall 61 and opens rearward. A plurality of (specifically, two) communication pipes 62 projecting forward in the axial direction from the front surface of the partition wall 61 are integrally connected. In the present embodiment, the partition wall 61 and the communication pipe 62 are integrally connected. However, other than this, the partition wall 61 and the communication pipe 62 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 cylindrical portion 65. The ink occlusion body 3 is accommodated in a space (that is, an occlusion body accommodation portion) formed by the front cylinder portion 65, the partition wall 61, 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 66. Specifically, the opening of the ink tank 7 is detachably attached to the rear cylinder portion 66 by screwing.

As shown in FIG. 2A, an abutting wall portion 61a made of a rib extending in the axial direction is integrally formed on the front surface of the partition wall 61. As shown in FIG. Here, the contact wall portion 61a is formed in a cross shape. The abutting wall portion 61 a abuts a part of the rear end surface of the ink occlusion body 3. The rear end surface of the ink occlusion body 3 is abutted and supported by the abutting wall portion 61a, and the front end surface of the ink occlusion body 3 is abutted and supported by the regulation wall portion 43a. The rattle is prevented. In a state where the abutting wall portion 61 a is in contact with a part of the rear end surface of the ink storage body 3, a gap 9 communicating with the outside air is formed between the front surface of the partition wall 61 and the rear end surface of the ink storage body 3. The The gap 9 is communicated with the outside air through the air passage 10. A part of the abutting wall portion 61a is formed between the base portions of the communication pipes 62, and the base side walls of the communication pipes 62 are connected. Thereby, the bending strength of each communication pipe 62 is improved, and the bending of each communication pipe 62 with respect to the partition wall 61 can be suppressed by the contact wall portion 61a.

-Communication pipe The flow path 62a is provided in the inside of each of the communication pipes 62 in the axial direction, and the flow path 62a is opened at both ends of each of the communication pipes 62. A front end of each of the communication pipes 62 is opened inside the ink storage body 3, and a rear end of each of the communication pipes 62 is opened in the ink tank 7 behind the ink storage body 3. Since the plurality of communication pipes 62 are arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent pipes 62 are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. A flow passage 62a is provided in parallel.

Each of the communication pipes 62 has a front end formed of one inclined cut surface and is sharpened. The front end of each of the communication pipes 62 is inserted by being inserted forward from the rear end of the ink storage body 3, and finally located inside the ink storage body 3. When the front ends of the communication pipes 62 are inserted into the ink storage body 3, the front ends of the communication pipes 62 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 62 is set to be 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 62. That is, a high density portion 31 having a high fiber density and a low density portion 32 having a low fiber density are formed inside the ink occlusion body 3. As a result, each of the communication pipes 62 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 62 is located inside the high density part 31 ahead of the low density part 32.

The inclined cut surface at the front end of each of the communication pipes 62 is formed to include the front end opening of each of the communication pipes 62. The inclined cut surface (that is, the front end opening portion of the communication pipe 62) faces the axial center 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 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 62. The fiber density in the vicinity of the rear end of 2 can be easily set high. In the present embodiment, the cross section of each outer surface and inner surface of the communication pipe 62 is circular, and the outer peripheral edge and inner peripheral edge of each front end of the communication pipe 62 are elliptical due to the inclined cut surface. ing. The inclined cut surface of the communication pipe 62 may face in a direction other than the axial direction.

The front end of each of the communication pipes 62 is disposed at a position radially outward from the axis of the ink storage body 3. Specifically, the respective communication pipes 62 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 62, the communication pipes 62 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 62 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The front end of each of the communication pipes 62 and the rear end of the nib 2 are connected via the inside of the ink occlusion body 3 so that ink can be circulated.

The protruding lengths in the axial direction from the front surface of the partition wall 61 of each of the communication pipes 62 are set to be different from each other. Among the communication pipes 62, the front end of the communication pipe 62 having a long protruding length is positioned slightly forward from the rear end of the pen tip 2. The communication pipe 62 having a short protruding length is located slightly behind the rear end of the pen tip 2. In the present embodiment, the axial length L1 at which the communication pipe 62 having a long protruding length is inserted into the ink storage body 3 is set to 25 mm, and the communication pipe 62 having a short protruding length is set to store the ink. The axial length L2 inserted into the body 3 is set to 15 mm. Therefore, the difference ΔL in the axial direction at the front end position of the communication pipe 62 is set to 10 mm. The axial length of the entire ink occlusion body 3 is set to 30 mm. The axial distance between the front end of each of the communication pipes 62 and the rear end of the nib 2 is set to be 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. As the ink 8 stored in the ink tank 7, a water-based ink for writing instruments, an oil-based ink for writing instruments, or a coating liquid is employed.

The front end opening of the ink tank 7 is detachably attached to the intermediate member 6. When ink in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the intermediate member 6 and the ink tank 7 is filled with ink or filled with ink. After replacing with a new ink tank 7, the ink tank 7 filled with ink is attached to the intermediate member 6. Thereby, writing becomes possible again.

(Second Embodiment)
3 and 4 show a direct liquid writing instrument 1 according to a second embodiment of the present invention.
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 nib 2 held at the front end portion, and the ink occlusion body 3 An occlusion body accommodating portion for accommodating the ink, an ink tank 7 which is attached to the rear of the occlusion body accommodating portion and directly stores the ink 8 therein, and the occlusion body accommodating portion and the ink tank 7 are partitioned. The partition 61 includes a plurality of (specifically, two) communication pipes 62 that protrude forward from the front surface of the partition 61 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 6 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 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. An annular groove 21 is formed at the intermediate portion of the nib 2. In addition, the front end of the nib 2 may be ground in a chisel 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 member 3 and the rear end of the pen tip 2 is positioned inside the ink storage member 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.

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), a plurality of ribs 43 extending in the axial direction are integrally formed. 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. The 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 6 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 6 includes a front cylinder portion 65 that opens forward, a partition wall 61 that is formed at the bottom of the front cylinder portion 65, a rear cylinder portion 66 that extends rearward from the partition wall 61 and opens rearward. A plurality of (specifically, two) communication pipes 62 projecting forward in the axial direction from the front surface of the partition wall 61 are integrally connected. In the present embodiment, the partition wall 61 and the communication pipe 62 are integrally connected. However, other than this, the partition wall 61 and the communication pipe 62 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 cylindrical portion 65. The ink occlusion body 3 is accommodated in a space (that is, an occlusion body accommodation portion) formed by the front cylinder portion 65, the partition wall 61, 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 66. Specifically, the opening of the ink tank 7 is detachably attached to the rear cylinder portion 66 by screwing.

As shown in FIG. 4A, an abutting wall portion 61a made of a rib extending in the axial direction is integrally formed on the front surface of the partition wall 61. As shown in FIG. Here, the contact wall portion 61a is formed in a cross shape. The abutting wall portion 61 a abuts a part of the rear end surface of the ink occlusion body 3. The rear end surface of the ink occlusion body 3 is abutted and supported by the abutting wall portion 61a, and the front end surface of the ink occlusion body 3 is abutted and supported by the regulation wall portion 43a. The rattle is prevented. In a state where the abutting wall portion 61 a is in contact with a part of the rear end surface of the ink storage body 3, a gap 9 communicating with the outside air is formed between the front surface of the partition wall 61 and the rear end surface of the ink storage body 3. The The gap 9 is communicated with the outside air through the air passage 10. A part of the abutting wall portion 61a is formed between the base portions of the communication pipes 62, and the base side walls of the communication pipes 62 are connected. Thereby, the bending strength of each communication pipe 62 is improved, and the bending of each communication pipe 62 with respect to the partition wall 61 can be suppressed by the contact wall portion 61a.

-Communication pipe The flow path 62a is provided in the inside of each of the communication pipes 62 in the axial direction, and the flow path 62a is opened at both ends of each of the communication pipes 62. A front end of each of the communication pipes 62 is opened inside the ink storage body 3, and a rear end of each of the communication pipes 62 is opened in the ink tank 7 behind the ink storage body 3. Since the plurality of communication pipes 62 are arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent pipes 62 are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. A flow passage 62a is provided in parallel.

The front end of each of the communication pipes 62 is a plane perpendicular to the axis. The front end of each of the communication pipes 62 is inserted by being inserted forward from the rear end of the ink storage body 3, and finally located inside the ink storage body 3. When the front ends of the communication pipes 62 are inserted into the ink storage body 3, the front ends of the communication pipes 62 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 62 is set to be 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 62. That is, a high density portion 31 having a high fiber density and a low density portion 32 having a low fiber density are formed inside the ink occlusion body 3. As a result, each of the communication pipes 62 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 62 is located inside the high density part 31 ahead of the low density part 32.

The front end of each of the communication pipes 62 is disposed at a position radially outward from the axis of the ink storage body 3. Specifically, the respective communication pipes 62 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 62, the communication pipes 62 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 62 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The front end of each of the communication pipes 62 and the rear end of the nib 2 are connected to each other through the ink occlusion body 3 so that ink can be circulated. Both front ends of the communication pipes 62 are located behind the rear end of the pen tip 2.

The protruding lengths in the axial direction from the front surface of the partition wall 61 of each of the communication pipes 62 are set to be different from each other. In the present embodiment, the axial length L1 into which the communication tube 62 having a long protruding length is inserted into the ink storage body 3 is set to 22 mm, and the communication tube 62 having a short protruding length is set to store the ink. The axial length L2 inserted into the body 3 is set to 17 mm. Therefore, the difference ΔL in the axial direction at the front end position of the communication pipe 62 is set to 5 mm. The axial length of the entire ink occlusion body 3 is set to 30 mm. The axial distance between the front end of the communication pipe 62 having a long protruding length (that is, the front end of the communication pipe 62 closest to the rear end of the pen tip 2) and the rear end of the pen tip 2 is set to 2 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. As the ink 8 stored in the ink tank 7, a water-based ink for writing instruments, an oil-based ink for writing instruments, or a coating liquid is employed.

The front end opening of the ink tank 7 is detachably attached to the intermediate member 6. When ink in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the intermediate member 6 and the ink tank 7 is filled with ink or filled with ink. After replacing with a new ink tank 7, the ink tank 7 filled with ink is attached to the intermediate member 6. Thereby, writing becomes possible again.

(Third embodiment)
A direct liquid writing instrument 1 according to a third 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, an intermediate member 6 disposed behind the ink occlusion body 3, An ink tank 7 disposed behind the intermediate member 6, and a shaft cylinder 5 that holds the pen tip 2 at the front end and accommodates the ink storage body 3, the intermediate member 6, and the ink tank 7 therein. And a tail plug 54 detachably screwed into the rear end opening of the shaft cylinder 5.

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. In addition, the front end of the nib 2 may be ground in a chisel 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 member 3 and the rear end of the pen tip 2 is positioned inside the ink storage member 3.

The shaft cylinder 5 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The shaft cylinder 5 includes a tip 51 for holding the outer peripheral surface of the pen nib 2 and a main body 52 that is connected to the rear of the tip 51 and accommodates the ink storage body 3, the partition wall 61, and the ink tank 7. Become.

A plurality of ribs 53 extending in the front-rear direction are integrally formed on the inner surface of the shaft cylinder 5 (that is, from the inner surface of the tapered portion 51 to the front inner surface of the main body 52). In the rib 53, a step-shaped regulating wall portion 53 a is formed in the vicinity of the connection portion between the tapered portion 51 of the shaft tube 5 and the main body portion 52. The front end surface of the ink occlusion body 3 abuts against the restriction wall portion 53 a in the axial direction, and the outer peripheral surface of the ink occlusion body 3 is pressed and held by the rib 53 on the inner surface of the front portion of the main body portion 52. The outer peripheral surface of the nib 2 is pressed and held by the rib 53 on the inner surface of the tapered portion 51. A cylindrical wall portion 53b is integrally formed between a portion of the rib 53 that holds the outer peripheral surface of the nib 2 and a portion that holds the outer peripheral surface of the ink occlusion body 3.

By the ribs 53, between the outer peripheral surface of the ink storage body 3 and the inner surface of the main body 52, between the front end surface of the ink storage body 3 and the inner surface of the shaft cylinder 5, and between the outer peripheral surface of the pen nib 2 and the inner surface of the tip 51. 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 5, and the rear side of the air passage 10 communicates 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 6 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 6 includes a partition wall 61 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 61 and are pierced and connected to the inside of the ink storage body 3 (specifically 2) communicating pipes 62, a connecting pipe 63 protruding rearward from the rear surface of the partition wall 61 and inserted into the front end opening of the ink tank 7, and a rearward projecting rear surface of the partition wall 61 and a shaft. And an attachment tube portion 64 fixed to the inner surface of the tube 5 (the inner surface of the main body 52). The ink occlusion body 3 is accommodated in a space formed by the shaft cylinder 5 and the partition wall 61 (that is, the occlusion body accommodation portion). In the present embodiment, the mounting cylinder portion 64 surrounds the outer periphery of the base portion of the connection pipe 63. In addition, the mounting cylinder portion 64 projects forward from the front surface of the partition wall 61 and communicates with each other. The structure surrounding the base part of the pipe | tube 62 may be sufficient. The connecting pipe 63 is integrally formed with a projecting piece 63a for pressing one side of the plug 71. The partition wall 61 has a disk shape, and each of the communication pipe 62, the connection pipe 63, and the mounting cylinder portion 64 has a cylindrical shape.

In the present embodiment, the partition wall 61, the respective communication pipes 62, the connection pipe 63, and the attachment cylinder part 64 are integrally connected. In other words, the partition wall 61, the communication pipe 62, the connection pipe 63, and the mounting cylinder portion 64 can be configured with one component by the intermediate member 6. In addition to this, in the present invention, any one of the communication pipe 62, the connection pipe 63, and the attachment cylinder portion 64 may be configured by a separate part from the partition wall 61.

As shown in FIG. 6B, an abutting wall portion 61a made of a plate-like rib is integrally formed on the front surface of the partition wall 61. The abutting wall portion 61 a abuts a part of the rear end surface of the ink occlusion body 3. A gap 9 communicating with the outside air is formed between the partition wall 61 and the rear end surface of the ink occluding body 3 by the contact wall portion 61a. The gap 9 is communicated with the outside air through the air passage 10. The contact wall 61a is formed in a radial cross section (here, a cross shape). A part of the contact wall 61a is formed between the bases of the respective communication pipes 62, and the base side walls of the communication pipes 62 are connected by the contact wall 61a. Thereby, the bending strength of each communication pipe 62 is improved, and the bending of each communication pipe 62 with respect to the partition wall 61 can be suppressed by the contact wall portion 61a.

-Communication pipe The flow path 62a is provided in the inside of each of the communication pipes 62 in the axial direction, and the flow path 62a is opened at both ends of each of the communication pipes 62. A front end of each of the communication pipes 62 is opened inside the ink storage body 3, and a rear end of each of the communication pipes 62 is opened in the ink tank 7 behind the ink storage body 3. Since each of the communication pipes 62 is arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent flow paths are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. 62a is provided in parallel. Each flow passage 62 a of the communication pipe 62 is penetrated through a location of the partition wall 61 located in the connection pipe 63 away from the axis.

The front end of each of the communication pipes 62 is a plane perpendicular to the axis. The front end of each of the communication pipes 62 is inserted by being inserted forward from the rear end of the ink storage body 3, and finally located inside the ink storage body 3. When the front ends of the communication pipes 62 are inserted into the ink storage body 3, the front ends of the communication pipes 62 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 62 is set to be 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 62. That is, a high density portion 31 having a high fiber density and a low density portion 32 having a low fiber density are formed inside the ink occlusion body 3. As a result, each of the communication pipes 62 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 62 is located inside the high density part 31 ahead of the low density part 32.

The front end of each of the communication pipes 62 is disposed at a position radially outward from the axis of the ink storage body 3. Specifically, the respective communication pipes 62 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 62, the communication pipes 62 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 62 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The front end of each of the communication pipes 62 and the rear end of the nib 2 are connected via the inside of the ink occlusion body 3 so that ink can be circulated. Both front ends of the communication pipes 62 are located behind the rear end of the pen tip 2.

The protruding lengths in the axial direction from the front surface of the partition wall 61 of each of the communication pipes 62 are set to be different from each other. In the present embodiment, the axial length L1 into which the communication pipe 62 having a long protruding length is inserted into the ink storage body 3 is set to 15 mm, and the communication pipe 62 having a short protruding length is set to the ink storage section. The axial length L2 inserted into the body 3 is set to 10 mm. Therefore, the difference ΔL in the axial direction at the front end position of the communication pipe 62 is set to 5 mm. The axial length of the entire ink occlusion body 3 is set to 23 mm. The axial distance between the front end of the communication pipe 62 having a long protruding length (that is, the front end of the communication pipe 62 closest to the rear end of the pen tip 2) and the rear end of the pen tip 2 is set to 2 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. As the ink 8 stored in the ink tank 7, a water-based ink for writing instruments, an oil-based ink for writing instruments, or a coating liquid is employed.

The outer surface of the connecting pipe 63 of the intermediate member 6 is detachably fitted to the inner surface of the front end opening of the ink tank 7. When ink in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the connection pipe 63 and the connection pipe 63 is inserted into the front end opening of a new ink tank 7 filled with ink. To do. Thereby, writing becomes possible again. A front end opening of the new ink tank 7 is closed by a plug 71. When the connecting pipe 63 is inserted into the front end opening of the ink tank 7, the plug 71 is pressed backward by the protrusion 63 a of the connecting pipe 63, the plug 71 is removed, and the front end opening of the ink tank 7 is opened. It is plugged.

-Tail plug The tail plug 54 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding of a transparent synthetic resin (for example, polypropylene).

A male screw portion is formed on the outer peripheral surface of the front portion of the tail plug 54, and the male screw portion is detachably screwed with the female screw portion of the inner peripheral surface of the rear end opening of the shaft cylinder 5.

When replacing the ink tank 7, the tail plug 54 is removed from the rear end portion of the shaft cylinder 5 by loosening the screw, and after removing the ink tank 7, a new ink tank 7 is inserted into the shaft cylinder 5. At the same time, the tail plug 54 is screwed into the rear end portion of the shaft cylinder 5 again. In the screwing process between the tail plug 54 and the rear end portion of the shaft cylinder 5, the rear end of the ink tank 7 comes into contact with the rear end wall of the tail plug 54, and the ink tank is tightened by screwing the tail plug 54 and the shaft cylinder 5. 7 is pushed forward, and the front end opening of the ink tank 7 is opened.

(Fourth embodiment)
A direct liquid writing instrument 1 according to a fourth 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, an intermediate member 6 disposed behind the ink occlusion body 3, An ink tank 7 disposed behind the intermediate member 6, and a shaft cylinder 5 that holds the pen tip 2 at the front end and accommodates the ink storage body 3, the intermediate member 6, and the ink tank 7 therein. And a tail plug 54 detachably screwed into the rear end opening of the shaft cylinder 5.

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. In addition, the front end of the nib 2 may be ground in a chisel 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 member 3 and the rear end of the pen tip 2 is positioned inside the ink storage member 3.

-Shaft cylinder The said shaft cylinder 5 is a cylindrical body obtained by injection molding of synthetic resins (for example, polypropylene, polyethylene, etc.). The shaft cylinder 5 includes a tip 51 for holding the outer peripheral surface of the pen nib 2 and a main body 52 that is connected to the rear of the tip 51 and accommodates the ink storage body 3, the partition wall 61, and the ink tank 7. Become.

A plurality of ribs 53 extending in the front-rear direction are integrally formed on the inner surface of the shaft cylinder 5 (that is, from the inner surface of the tapered portion 51 to the front inner surface of the main body 52). In the rib 53, a step-shaped regulating wall portion 53 a is formed in the vicinity of the connection portion between the tapered portion 51 of the shaft tube 5 and the main body portion 52. The front end surface of the ink occlusion body 3 abuts against the restriction wall portion 53 a in the axial direction, and the outer peripheral surface of the ink occlusion body 3 is pressed and held by the rib 53 on the inner surface of the front portion of the main body portion 52. The outer peripheral surface of the nib 2 is pressed and held by the rib 53 on the inner surface of the tapered portion 51. A cylindrical wall portion 53b is integrally formed between a portion of the rib 53 that holds the outer peripheral surface of the nib 2 and a portion that holds the outer peripheral surface of the ink occlusion body 3.

By the ribs 53, between the outer peripheral surface of the ink storage body 3 and the inner surface of the main body 52, between the front end surface of the ink storage body 3 and the inner surface of the shaft cylinder 5, and between the outer peripheral surface of the pen nib 2 and the inner surface of the tip 51. 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 5, and the rear side of the air passage 10 communicates 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 6 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 6 includes a partition wall 61 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 61 and are pierced and connected to the inside of the ink storage body 3 (specifically 2) communicating pipes 62, a connecting pipe 63 protruding rearward from the rear surface of the partition wall 61 and inserted into the front end opening of the ink tank 7, and a rearward projecting rear surface of the partition wall 61 and a shaft. And an attachment tube portion 64 fixed to the inner surface of the tube 5 (the inner surface of the main body 52). The ink occlusion body 3 is accommodated in a space formed by the shaft cylinder 5 and the partition wall 61 (that is, the occlusion body accommodation portion). In the present embodiment, the mounting cylinder portion 64 surrounds the outer periphery of the base portion of the connection pipe 63. In addition, the mounting cylinder portion 64 protrudes forward from the front surface of the partition wall 61 and communicates with each other. The structure surrounding the base part of the pipe | tube 62 may be sufficient. The connecting pipe 63 is integrally formed with a projecting piece 63a for pressing one side of the plug 71. The partition wall 61 has a disk shape, and each of the communication pipe 62, the connection pipe 63, and the mounting cylinder portion 64 has a cylindrical shape.

In the present embodiment, the partition wall 61, the respective communication pipes 62, the connection pipe 63, and the attachment cylinder part 64 are integrally connected. In other words, the partition wall 61, the communication pipe 62, the connection pipe 63, and the mounting cylinder portion 64 can be configured with one component by the intermediate member 6. In addition to this, in the present invention, any one of the communication pipe 62, the connection pipe 63, and the attachment cylinder portion 64 may be configured by a separate part from the partition wall 61.

As shown in FIG. 8B, an abutting wall portion 61 a made of a plate-like rib is integrally formed on the front surface of the partition wall 61. The abutting wall portion 61 a abuts a part of the rear end surface of the ink occlusion body 3. A gap 9 communicating with the outside air is formed between the partition wall 61 and the rear end surface of the ink occluding body 3 by the contact wall portion 61a. The gap 9 is communicated with the outside air through the air passage 10. The contact wall 61a is formed in a radial cross section (here, a cross shape). The abutting wall portion 61 a is connected to the base side wall of each communication pipe 62. Accordingly, the bending strength of each communication pipe 62 is improved, and the bending of each communication pipe 62 with respect to the partition wall 61 can be suppressed.

-Communication pipe The flow path 62a is provided in the inside of each of the communication pipes 62 in the axial direction, and the flow path 62a is opened at both ends of each of the communication pipes 62. A front end of each of the communication pipes 62 is opened inside the ink storage body 3, and a rear end of each of the communication pipes 62 is opened in the ink tank 7 behind the ink storage body 3. Since each of the communication pipes 62 is arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent flow paths are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. 62a is provided in parallel.

In the present embodiment, the communication pipe 62 is composed of two semi-cylindrical cylinders having a transverse cross section, and has a shape in which the planar side walls of the communication pipes 62 are combined. That is, the communication pipe 62 has a shape in which the inside of the cylindrical body is divided into two by axial partition walls (planar side walls), and two independent flow passages 62a having a semicircular cross section are formed of the cylindrical body. Formed axially inside. Thereby, the bending strength of each communication pipe 62 with respect to the partition wall 61 is further improved.

The front end of each of the communication pipes 62 is a plane perpendicular to the axis. The front end of each of the communication pipes 62 is inserted by being inserted forward from the rear end of the ink storage body 3, and finally located inside the ink storage body 3. When the front ends of the communication pipes 62 are inserted into the ink storage body 3, the front ends of the communication pipes 62 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 62 is set to be 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 62. That is, a high density portion 31 having a high fiber density and a low density portion 32 having a low fiber density are formed inside the ink occlusion body 3. As a result, each of the communication pipes 62 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 62 is located inside the high density part 31 ahead of the low density part 32.

The front end of each of the communication pipes 62 is not directly connected to the rear end of the pen nib 2 and is not in contact with the pen nib 2. The front end of each of the communication pipes 62 and the rear end of the nib 2 are ink occlusions. It is connected through the inside of the body 3 so that ink can be distributed. Both the front ends of the communication pipes 62 are located behind the rear end of the nib 2.

The protruding lengths in the axial direction from the front surface of the partition wall 61 of each of the communication pipes 62 are set to be different from each other. In the present embodiment, the axial length L1 into which the communication tube 62 having a long protruding length is inserted into the ink storage body 3 is set to 22 mm, and the communication tube 62 having a short protruding length is set to store the ink. The axial length L2 inserted into the body 3 is set to 12 mm. Therefore, the difference ΔL in the axial direction at the front end position of the communication pipe 62 is set to 10 mm. The axial length of the entire ink occlusion body 3 is set to 30 mm. The axial distance between the front end of the communication pipe 62 having a long protruding length (that is, the front end of the communication pipe 62 closest to the rear end of the pen tip 2) and the rear end of the pen tip 2 is set to 2 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. As the ink 8 stored in the ink tank 7, a water-based ink for writing instruments, an oil-based ink for writing instruments, or a coating liquid is employed.

The outer surface of the connecting pipe 63 of the intermediate member 6 is detachably fitted to the inner surface of the front end opening of the ink tank 7. When ink in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the connection pipe 63 and the connection pipe 63 is inserted into the front end opening of a new ink tank 7 filled with ink. To do. Thereby, writing becomes possible again. A front end opening of the new ink tank 7 is closed by a plug 71. When the connecting pipe 63 is inserted into the front end opening of the ink tank 7, the plug 71 is pressed backward by the protrusion 63 a of the connecting pipe 63, the plug 71 is removed, and the front end opening of the ink tank 7 is opened. It is plugged.

-Tail plug The tail plug 54 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding of a transparent synthetic resin (for example, polypropylene).

A male screw portion is formed on the outer peripheral surface of the front portion of the tail plug 54, and the male screw portion is detachably screwed with the female screw portion of the inner peripheral surface of the rear end opening of the shaft cylinder 5.

When replacing the ink tank 7, the tail plug 54 is removed from the rear end portion of the shaft cylinder 5 by loosening the screw, and after removing the ink tank 7, a new ink tank 7 is inserted into the shaft cylinder 5. At the same time, the tail plug 54 is screwed into the rear end portion of the shaft cylinder 5 again. In the screwing process between the tail plug 54 and the rear end portion of the shaft cylinder 5, the rear end of the ink tank 7 comes into contact with the rear end wall of the tail plug 54, and the ink tank is tightened by screwing the tail plug 54 and the shaft cylinder 5. 7 is pushed forward, and the front end opening of the ink tank 7 is opened.

(Fifth embodiment)
A direct liquid writing instrument 1 according to a fifth 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, an intermediate member 6 disposed behind the ink occlusion body 3, An ink tank 7 disposed behind the intermediate member 6, and a shaft cylinder 5 that holds the pen tip 2 at the front end and accommodates the ink storage body 3, the intermediate member 6, and the ink tank 7 therein. And a tail plug 54 detachably screwed into the rear end opening of the shaft cylinder 5.

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. In addition, the front end of the nib 2 may be ground in a chisel 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 member 3 and the rear end of the pen tip 2 is positioned inside the ink storage member 3.

The shaft cylinder 5 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The shaft cylinder 5 includes a tip 51 for holding the outer peripheral surface of the pen nib 2 and a main body 52 that is connected to the rear of the tip 51 and accommodates the ink storage body 3, the partition wall 61, and the ink tank 7. Become.

A plurality of ribs 53 extending in the front-rear direction are integrally formed on the inner surface of the shaft cylinder 5 (that is, from the inner surface of the tapered portion 51 to the front inner surface of the main body 52). In the rib 53, a step-shaped regulating wall portion 53 a is formed in the vicinity of the connection portion between the tapered portion 51 of the shaft tube 5 and the main body portion 52. The front end surface of the ink occlusion body 3 abuts against the restriction wall portion 53 a in the axial direction, and the outer peripheral surface of the ink occlusion body 3 is pressed and held by the rib 53 on the inner surface of the front portion of the main body portion 52. The outer peripheral surface of the nib 2 is pressed and held by the rib 53 on the inner surface of the tapered portion 51. A cylindrical wall portion 53b is integrally formed between a portion of the rib 53 that holds the outer peripheral surface of the nib 2 and a portion that holds the outer peripheral surface of the ink occlusion body 3.

By the ribs 53, between the outer peripheral surface of the ink storage body 3 and the inner surface of the main body 52, between the front end surface of the ink storage body 3 and the inner surface of the shaft cylinder 5, and between the outer peripheral surface of the pen nib 2 and the inner surface of the tip 51. 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 5, and the rear side of the air passage 10 communicates 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 6 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 6 includes a partition wall 61 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 61 and are pierced and connected to the inside of the ink storage body 3 (specifically 2) communicating pipes 62, a connecting pipe 63 protruding rearward from the rear surface of the partition wall 61 and inserted into the front end opening of the ink tank 7, and a rearward projecting rear surface of the partition wall 61 and a shaft. And an attachment tube portion 64 fixed to the inner surface of the tube 5 (the inner surface of the main body 52). The ink occlusion body 3 is accommodated in a space formed by the shaft cylinder 5 and the partition wall 61 (that is, the occlusion body accommodation portion). In the present embodiment, the mounting cylinder portion 64 surrounds the outer periphery of the base portion of the connection pipe 63. In addition, the mounting cylinder portion 64 projects forward from the front surface of the partition wall 61 and communicates with each other. The structure surrounding the base part of the pipe | tube 62 may be sufficient. The connecting pipe 63 is integrally formed with a projecting piece 63a for pressing one side of the plug 71. The partition wall 61 has a disk shape, and each of the communication pipe 62, the connection pipe 63, and the mounting cylinder portion 64 has a cylindrical shape.

In the present embodiment, the partition wall 61, the respective communication pipes 62, the connection pipe 63, and the attachment cylinder part 64 are integrally connected. In other words, the partition wall 61, the communication pipe 62, the connection pipe 63, and the mounting cylinder portion 64 can be configured with one component by the intermediate member 6. In addition to this, in the present invention, any one of the communication pipe 62, the connection pipe 63, and the attachment cylinder portion 64 may be configured by a separate part from the partition wall 61.

As shown in FIG. 10B, an abutting wall portion 61a made of a plate-like rib is integrally formed on the front surface of the partition wall 61. The abutting wall portion 61 a abuts a part of the rear end surface of the ink occlusion body 3. A gap 9 communicating with the outside air is formed between the partition wall 61 and the rear end surface of the ink occluding body 3 by the contact wall portion 61a. The gap 9 is communicated with the outside air through the air passage 10. The contact wall 61a is formed in a radial cross section (here, a cross shape). The abutting wall portion 61 a is connected to the base side wall of each communication pipe 62. Accordingly, the bending strength of each communication pipe 62 is improved, and the bending of each communication pipe 62 with respect to the partition wall 61 can be suppressed.

-Communication pipe The flow path 62a is provided in the inside of each of the communication pipes 62 in the axial direction, and the flow path 62a is opened at both ends of each of the communication pipes 62. A front end of each of the communication pipes 62 is opened inside the ink storage body 3, and a rear end of each of the communication pipes 62 is opened in the ink tank 7 behind the ink storage body 3. Since each of the communication pipes 62 is arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent flow paths are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. 62a is provided in parallel.

In the present embodiment, the two communication pipes 62 are provided, and the two communication pipes 62 are arranged concentrically inside the communication pipe made of a large diameter cylindrical body and the large diameter communication pipe. The inner wall of the large-diameter communication pipe and the outer wall of the small-diameter communication pipe are integrally connected by a plurality of connecting ribs 62b. Thereby, in the inside of the two communication pipes 62, an axial flow passage 62a composed of an annular gap between the inner surface of the large diameter communication pipe and the outer surface of the small diameter communication pipe, and the inside of the small diameter communication pipe The axial flow passage 62a to be formed is provided independently.

The front end of each of the communication pipes 62 is a plane perpendicular to the axis. The front end of each of the communication pipes 62 is inserted by being inserted forward from the rear end of the ink storage body 3, and finally located inside the ink storage body 3. When the front ends of the communication pipes 62 are inserted into the ink storage body 3, the front ends of the communication pipes 62 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 62 is set to be 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 62. That is, a high density portion 31 having a high fiber density and a low density portion 32 having a low fiber density are formed inside the ink occlusion body 3. As a result, each of the communication pipes 62 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 62 is located inside the high density part 31 ahead of the low density part 32.

The front end of each of the communication pipes 62 is not directly connected to the rear end of the pen nib 2 and is not in contact with the pen nib 2. The front end of each of the communication pipes 62 and the rear end of the nib 2 are ink occlusions. It is connected through the inside of the body 3 so that ink can be distributed. Both the front ends of the communication pipes 62 are located behind the rear end of the nib 2.

The protruding lengths in the axial direction from the front surface of the partition wall 61 of each of the communication pipes 62 are set to be different from each other. In the present embodiment, the axial length L1 in which the communication pipe 62 (small diameter communication pipe) having a long protruding length is inserted into the ink storage body 3 is set to 22 mm, and the protruding length is short. The axial length L2 at which the communication pipe 62 (large diameter communication pipe) is inserted into the ink storage body 3 is set to 17 mm. Therefore, the difference ΔL in the axial direction at the front end position of the communication pipe 62 is set to 5 mm. The axial length of the entire ink occlusion body 3 is set to 30 mm. The axial distance between the front end of the communication pipe 62 having a long protruding length (that is, the front end of the communication pipe 62 closest to the rear end of the pen tip 2) and the rear end of the pen tip 2 is set to 2 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. As the ink stored in the ink tank 7, a water-based ink for writing instruments, an oil-based ink for writing instruments, or a coating liquid is employed.

The outer surface of the connecting pipe 63 of the intermediate member 6 is detachably fitted to the inner surface of the front end opening of the ink tank 7. When ink in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the connection pipe 63 and the connection pipe 63 is inserted into the front end opening of a new ink tank 7 filled with ink. To do. Thereby, writing becomes possible again. A front end opening of the new ink tank 7 is closed by a plug 71. When the connecting pipe 63 is inserted into the front end opening of the ink tank 7, the plug 71 is pressed backward by the protrusion 63 a of the connecting pipe 63, the plug 71 is removed, and the front end opening of the ink tank 7 is opened. It is plugged.

-Tail plug The tail plug 54 is a bottomed cylindrical body having a front end opened and a rear end closed, and is obtained by injection molding of a transparent synthetic resin (for example, polypropylene).

A male screw portion is formed on the outer peripheral surface of the front portion of the tail plug 54, and the male screw portion is detachably screwed with the female screw portion of the inner peripheral surface of the rear end opening of the shaft cylinder 5.

When replacing the ink tank 7, the tail plug 54 is removed from the rear end portion of the shaft cylinder 5 by loosening the screw, and after removing the ink tank 7, a new ink tank 7 is inserted into the shaft cylinder 5. At the same time, the tail plug 54 is screwed into the rear end portion of the shaft cylinder 5 again. In the screwing process between the tail plug 54 and the rear end portion of the shaft cylinder 5, the rear end of the ink tank 7 comes into contact with the rear end wall of the tail plug 54, and the ink tank is tightened by screwing the tail plug 54 and the shaft cylinder 5. 7 is pushed forward, and the front end opening of the ink tank 7 is opened.

It is a longitudinal cross-sectional view which shows the pen tip downward state of the 1st Embodiment of this invention. (A) is the sectional view on the AA line of FIG. 1, (b) is the sectional view on the BB line of FIG. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 2nd Embodiment of this invention. (A) is CC sectional view taken on the line of FIG. 3, (b) is DD sectional view taken on the line of FIG. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 3rd Embodiment of this invention. (A) is the EE line enlarged sectional view of FIG. 5, (b) is the FF line enlarged sectional view of FIG. 5, (c) is the GG line enlarged sectional view of FIG. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 4th Embodiment of this invention. (A) is the HH line expanded sectional view of FIG. 7, (b) is the II sectional expanded view of FIG. 7, (c) is the JJ expanded sectional view of FIG. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 5th Embodiment of this invention. (A) is the KK line expanded sectional view of FIG. 9, (b) is the MM line expanded sectional view of FIG. 9, (c) is the NN 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 32 Low density part 4 Tip member 41 Small diameter part 42 Large diameter part 43 Rib 43a Restriction wall part 43b Locking convex part 5 Shaft cylinder 51 Tip 52 Main body portion 53 Rib 53a Restriction wall portion 53b Cylindrical wall portion 54 Tail plug 6 Intermediate member 61 Partition wall 61a Abutting wall portion 62 Communication pipe 62a Flow passage 62b Connection rib 63 Connection pipe 63a Projection piece 64 Mounting cylinder portion 65 Front cylinder portion 66 Rear cylinder 7 Ink tank 71 Plug 8 Ink 9 Clearance 10 Air passages L1, L2 Axial length ΔL of the communication pipe inserted into the ink storage body In the axial direction between the front end positions of the communication pipes difference

Claims (6)

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 plurality of the communication pipes, the front ends of the communication pipes are opened, and the front ends of the communication pipes are located inside the ink occlusion body, A direct liquid type writing instrument having an axial difference between the front end positions of the communication pipes. The direct liquid writing instrument according to claim 1, wherein the axial difference between the front end positions of the communication pipes is set within 15 mm. 3. The direct liquid writing instrument according to claim 1, wherein a rear end of the nib and a front end of each of the communication pipes are connected via the ink occlusion body so that ink can be circulated. By inserting the front end of each of the communication pipes forward from the rear end of the ink storage body and pressing and compressing the inside of the ink storage body forward, the density of the ink storage bodies near the front end of each of the communication pipes is reduced. The direct liquid writing instrument according to any one of claims 1 to 3, wherein the density is set higher than the density of the ink occlusion body in a portion other than the vicinity of the front end of each of the communication pipes. 5. The direct liquid writing instrument according to claim 4, wherein an axial length of a portion inserted into each ink occlusion body of the communication pipe is 3 mm or more. The direct liquid writing instrument according to any one of claims 1 to 5, wherein a front end surface and a rear end surface of the ink occlusion body are communicated with outside air.

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