JP2007245376A - 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 pen point side and, in addition, in which air interchanges with ink quickly at an initial ink feed, resulting in making writing possible in a short period of time. <P>SOLUTION: This direct liquid type writing utensil 1 consists of a pen point 2, an ink occluding body 3 connected with the rear end of the pen point 2, an ink tank 7 directly storing with ink 8 and communicating vessels connecting between the ink tank 7 and the ink occluding body 3 under the condition that the communicating vessels 52 consist of a plurality of ones, a partition wall 51 is provided between the ink occluding body 3 and the ink tank 7 in such a manner that each communicating vessel 52 projects ahead from the front surface of the partition wall 51, the front end of each communicating vessel 52 is located within the ink occluding body 3 and an abutting wall part 51a abutting against some part of the rear end surface of the ink occluding body 3 is formed at the front surface of the partition wall 51 so as to form gaps 9 ventilative with one air by the abutting wall part 51a between the rear end surface of the ink occluding body 3 and the front surface of the partition wall 51. <P>COPYRIGHT: (C)2007,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 an ink container has a communication hole (communication tube) and a through hole and is filled with an absorbent material. A writing instrument characterized in that a brush is inserted into the body and communicated with the absorbent material, the ventilation tube is inserted into the through hole, and the outside air and the ink container are communicated.

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

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

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

Furthermore, the direct liquid type writing instrument of Patent Document 2 has a configuration in which the pen tip penetrates the liquid absorbing material on the side of the main body opening and contacts the liquid absorbing material on the ink storage chamber side. It is difficult to set the dimensions short. As a result, the cost of the pen tip increases and cannot be provided to the user at a low cost, and the ink outflow path from the pen tip rear end to the tip of the pen tip becomes longer, the ink outflow from the pen tip decreases, Handwriting breaks easily occur.

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

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

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

The present invention solves the above-mentioned conventional problems, and there is no possibility that the ink in the ink tank leaks out from the pen tip side, and the air and the ink are replaced quickly at the time of initial ink discharge, and in a short time. The present invention intends to provide a direct liquid writing instrument that enables writing.

(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 52 connecting between the ink tank 7 and the ink occlusion body 3, comprising a plurality of the communication pipes 52, and a partition wall between the ink occlusion body 3 and the ink tank 7. 51, each of the communication pipes 52 projects forward from the front surface of the partition wall 51, the front end of each of the communication pipes 52 is positioned inside the ink storage body 3, and the ink storage body 3 is disposed on the front surface of the partition wall 51. A contact wall portion 51a that contacts a part of the rear end surface of the ink storage body is formed, and when the contact wall portion 51a contacts the rear end surface of the ink storage body 3, the rear end surface of the ink storage body 3 and the front surface of the partition wall 51 are formed. A gap 9 between the outside air and the outside air that can be vented ( Formed 1) and the requirements.

Each of the communication pipes 52 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 52 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 52. That is, in the case of n communication pipes 52 (n is an integer of 2 or more), one or more and (n-1) or less communication pipes 52 supply ink, and the other remaining communication pipes 52 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 52 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 52 that has been supplying the ink is also stopped. As a result, each front end opening of the communication pipe 52 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.

Since the direct liquid writing instrument 1 (Configuration 1) has a configuration in which the front ends of the communication pipes 52 are located inside the ink storage body 3, all of the front end openings of the communication pipes 52 are filled with ink. It can be easily closed by a liquid seal of ink impregnated inside the body 3. As a result, excess ink is not supplied from the ink tank 7 to the ink occlusion body 3, and there is no possibility that the ink leaks outside from the pen tip 2 side.

The direct liquid writing instrument 1 (Configuration 1) includes a plurality of communication pipes 52 (that is, two or more), and when at least one of the communication pipes 52 supplies ink, the other communication pipes 52 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 a gap 9 between the rear end face of the ink occlusion body 3 and the front surface of the partition wall 51 so that air and air can be vented. The air can escape from the rear end surface of the ink occlusion body 3 to the outside. Thereby, when the pressure in the ink tank 7 rises due to a temperature rise or the like, the ink pushed out from the ink tank 7 smoothly passes through the vicinity of the front end of the communication pipe 52 of the ink storage body 3 from the front end of the communication pipe 52. The ink is impregnated behind the ink occlusion body 3 to prevent leakage of the ink to the outside. On the other hand, when the pressure in the ink tank 7 is reduced due to a temperature drop or the like, the impregnation ink behind the ink occlusion body 3 is It can be returned to the ink tank 7 through the communication pipe 52 from the front end opening of the communication pipe 52 through the vicinity of the front end of the communication pipe 52 inside the occlusion body 3. In particular, in the direct liquid writing instrument 1 (Configuration 1), the rearward movement of the ink storage body 3 is restricted by the abutting wall 51a, and between the rear end surface of the ink storage body 3 and the front surface of the partition wall 51. The gap 9 can be reliably formed.

(Configuration 2)
In the direct liquid writing instrument 1 having the configuration 1, it is preferable that the contact wall portion 51a is connected to each base portion of the communication pipe 52 and the front surface of the partition wall 51 (configuration 2).

In the direct liquid writing instrument 1 (Configuration 2), the bending strength of the communication pipe 52 with respect to the partition wall 51 is improved, and bending of the communication pipe 52 can be suppressed. In addition, since the direct liquid writing instrument 1 (Configuration 2) has the contact wall portion 51a formed at each base portion of the communication pipe 52, the contact wall portion 51a can be provided in a wide range, and the ink occlusion body. 3 Stable contact between the rear end surface and the contact wall 51a is possible.

(Configuration 3)
In the direct liquid writing instrument 1 of the configuration 2, it is preferable that the abutting wall portion 51a is formed by connecting the base portions of the communication pipe 52 to each other (configuration 3).

In the direct liquid writing instrument 1 (Configuration 3), the bending strength of the communication pipe 52 with respect to the partition wall 51 is further improved, and the bending of the communication pipe 52 can be suppressed. The abutting wall portion 51a protrudes in the axial direction in that sufficient air permeability of the rear end surface of the ink occluding body 3 is obtained and stable contact with the rear end surface of the ink occluding body 3 is obtained. It preferably consists of plate-like ribs. Further, the plate-like ribs are preferably provided in a radial cross section in that the base portions of the communication pipe 52 are connected to each other, and at the same time, stable contact with the rear end surface of the ink storage body 3 is obtained.

(Configuration 4)
In the direct liquid writing instrument 1 of any one of the configurations 1 to 3, the ink occlusion body 3 includes a high-density portion 31 and a low-density portion 32 connected to the rear of the high-density portion 31, and the high-density portion. It is preferable that the front end of each of the communication pipes 52 and the rear end of the nib 2 are positioned in the portion 31 (Configuration 4).

In the direct liquid writing instrument 1 (configuration 4), the ink occlusion body 3 is a portion where the density in the vicinity of the front end of each of the communication pipes 52 is set high (high density portion 31), and the vicinity of the front end of each of the communication pipes 52 And a portion (low density portion 32) in which the density of the portion is set low. 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 52 can be reliably liquid-sealed with the impregnating ink. As a result, when the pressure in the ink tank 7 decreases due to a temperature drop or the like, the ink impregnated in the ink storage body 3 does not remain in the ink storage body 3, and the high density portion of the ink storage body 3 31 is returned to the ink tank 7 appropriately through the communication pipe 52.

The direct liquid writing instrument 1 (Configuration 4) is configured such that the front ends of the communication pipes 52 are connected to the high-density portion 31 of the ink storage body 3, so that all of the front end openings of the communication pipes 52 are connected. The ink occlusion body 3 can be easily closed by a liquid seal of ink impregnated in the ink occlusion body 3. As a result, excess ink is not supplied from the ink tank 7 to the ink occlusion body 3, and there is no possibility that the ink leaks outside from the pen tip 2 side.

The direct liquid writing instrument 1 (configuration 4) has a configuration in which the rear end of the pen tip 2 is connected to the high-density portion 31, so that ink can be supplied even when there is no ink supply from the ink tank 7 such as a pen tip upward state. Writing can be sufficiently performed by the ink impregnated in the high density portion 31 of the occlusion body 3.

(Configuration 5)
In the direct liquid writing instrument 1 of any one of the configurations 1 to 4, it is preferable that the axial positions of the front ends of the communication pipes 52 are set to be equal to each other (configuration 5).

In the direct liquid writing instrument 1 (Configuration 5), the axial positions of the front ends of the communication pipes 52 are set to be equal to each other (that is, the front ends of the communication pipes 52 are not separated from each other). Therefore, the distance between the front ends of the communication pipes 52 inside the ink occlusion body 3 is further shortened, the liquid sealability of the front end openings of the communication pipes 52 is improved, and ink leaks to the outside. Can be further prevented.

(Configuration 6)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 5, it is preferable that the front end of each of the communication pipes 52 is positioned in the vicinity of the rear end of the pen tip 2 inside the ink occlusion body 3 (configuration 6).

  The direct liquid writing instrument 1 (configuration 6) has a configuration in which the front ends of the communication pipes 52 are positioned in the vicinity of the rear end of the pen tip 2, so that no matter which ink is supplied from the front end opening of any of the communication pipes 52, the pen The ink 8 can be quickly supplied to the tip 2. As a result, writing can be performed reliably in a short time when the initial ink is dispensed.

(Configuration 7)
In the direct liquid writing instrument 1 of any one of the configurations 1 to 6, the front end of each of the communication pipes 52 is located inwardly of the ink storage body 3, and the rear end of the pen tip 2 is the ink storage body. 3 is preferably located in front of the inside (configuration 7).

In the direct liquid writing instrument 1 (configuration 7), the rear end of the nib 2 is located in front of the ink occlusion body 3, so that the longitudinal dimension of the entire nib 2 can be set short. As a result, abundant ink 8 from the ink tank 7 is supplied to the rear end of the pen tip 2 through the communication pipe 52 through the front of the ink occlusion body 3 and then rapidly supplied to the front end of the pen tip 2. Therefore, smooth ink outflow from the nib 2 without any handwriting breakage or handwriting blur is obtained. 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.

Further, in the direct liquid writing instrument 1 (Configuration 7), when the pressure in the ink tank 7 is increased due to a temperature rise or the like, excess ink pushed out from the ink tank 7 passes through the communication pipe 52 to form ink. The ink is supplied to the front side of the occlusion body 3 and further supplied to the rear side of the ink occlusion body 3 to be temporarily impregnated. On the other hand, when the pressure in the ink tank 7 decreases due to a temperature drop or the like, the ink impregnated in the rear side of the ink occlusion body 3 passes through the communication pipe 52 through the inner front side of the ink occlusion body 3. Returned in.

That is, when the pressure in the ink tank 7 changes due to the configuration in which the front ends of the communication pipes 52 are located in front of the ink storage body 3, the direct liquid writing instrument 1 (configuration 7) has an in-tank 7. The excess ink inside can be appropriately absorbed by the ink occlusion body 3 and then the excess ink can be properly returned to the ink tank 7. As a result, the ink can be sufficiently prevented from leaking to the outside.

(Configuration 8)
In the direct liquid writing instrument 1 having any one of the configurations 1 to 7, the ink occlusion body 3 (the high density portion 31) is interposed between the rear end of the pen tip 2 and the front end of each of the communication pipes 52. It is preferable that the ink is connected so as to be able to distribute ink (Configuration 8).

In the direct liquid writing instrument 1 (configuration 8), since the rear end of the nib 2 and the front end of each of the communication pipes 52 are not directly connected, at least the rear end of the nib 2 and the communication pipe 52 are not connected. A predetermined amount of ink is impregnated in the ink occlusion body 3 (inside the high density portion 31) between the front ends of each of the ink. Thereby, even when there is no ink supply from the ink tank 7 such as the pen tip upward state, the inside of the ink occlusion body 3 (the high density portion 31) between the rear end of the pen tip 2 and the front end of each of the communication pipes 52. It is possible to write well with ink impregnated in the interior.

(Configuration 9)
In the direct liquid writing instrument 1 having the configuration 4, the front end of each of the communication pipes 52 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 to thereby form the communication. It is preferable that the density of the ink storage body 3 in the vicinity of the front end of each of the tubes 52 is set higher than the density of the ink storage body 3 in a portion other than the vicinity of the front end of each of the communication pipes 52 (Configuration 9).

The direct liquid writing instrument 1 (configuration 9) includes a difference in density of the ink occluding body 3 (ie, the high density portion 31 and the low density portion 32 of the ink occluding body 3), and the front end of each communicating pipe 52 at the ink occluding body. 3 is inserted forward from the rear end, and the inside of the ink occlusion body 3 is formed by pressing and compressing the inside of the ink occlusion body 3 forward. There is no need to provide it, and the manufacturing becomes extremely easy.

(Configuration 10)
In the direct liquid writing instrument 1 of the configuration 4 or the configuration 9, the void ratio of the ink occlusion body 3 other than the vicinity of the front end of each of the communication pipes 52 is 70% to 95%, and the vicinity of the front end of each of the communication pipes 52 The difference between the porosity of the ink storage body 3 other than the ink storage body 3 and the porosity of the ink storage body 3 in the vicinity of the front end of each of the communication pipes 52 is 7% or more (preferably 10% or more) (Configuration 10). preferable.

In the direct liquid writing instrument 1 (Configuration 10), the porosity of the ink occlusion body 3 other than the vicinity of the front end of each of the communication pipes 52 is a portion where the density other than the vicinity of the front end of each of the communication pipes 52 is set low ( It is the porosity of the ink storage body 3 in the low density portion 32), and the porosity of the ink storage body 3 in the vicinity of each front end of the communication pipe 52 is set to a high density in the vicinity of each front end of the communication pipe 52. This is the porosity of the ink occlusion body 3 in the portion (high density portion 31). By setting the porosity of the low density portion 32 in the range of 70% to 95% and setting the difference between the porosity of the low density portion 32 and the porosity of the high density portion 31 to 7% or more. In addition, the front end opening of each communication pipe 52 can be liquid-sealed with impregnation ink.

(Configuration 11)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 10, the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 52 are the total of the ink storage body 3. It is preferably set to 3% to 50% (preferably 3% to 30%) of the length in the axial direction (Configuration 11).

  The direct liquid type writing instrument 1 (configuration 11) does not leak ink from the front end of the ink occlusion body 3 when the internal pressure of the ink tank 7 rises. Sufficient ink outflow is obtained. If the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 52 positioned behind the ink storage body 3 are less than 3% of the axial length of the entire ink storage body 3, When the internal pressure of the ink tank 7 increases, the ink may leak out from the front end of the ink occlusion body 3. Further, if the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 52 positioned behind the ink storage body 3 exceed 50% of the overall length of the ink storage body 3 in the axial direction. The distance from the front end of each of the communication pipes 52 to the front end of the pen tip 2 becomes long, and there is a possibility that the ink outflow property is hindered.

(Configuration 12)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 11, the axial distances S1 and S2 from the front end of the ink occlusion body 3 to the front ends of the communication pipes 52 are set equal (configuration 12). ) Is preferred.

In the direct liquid writing instrument 1 (Configuration 12), the distance between the front ends of the communication pipes 52 inside the ink occlusion body 3 is further shortened, and the liquid sealability of the front end openings of the communication pipes 52 is improved. This can further prevent ink leakage to the outside.

(Configuration 13)
In the direct liquid writing instrument 1 of any one of the configurations 1 to 12, the axial distances T1 and T2 between the front end of each of the communication pipes 52 and the rear end of the nib 2 are set within 10 mm (millimeters). (Configuration 13) is preferable.

In the direct liquid writing instrument 1 (configuration 13), ink is rapidly supplied from the front end of each of the communication pipes 52 to the rear end of the pen tip 2 at the time of initial ink discharge, and writing can be performed in a short time. If the distances T1 and T2 in the axial direction between the front ends of the communication pipes 52 and the rear end of the nib 2 exceed 10 mm, the distances between the front ends of the communication pipes 52 and the rear end of the nib 2 are large. As a result, the ink cannot be supplied quickly from the front end of each of the communication pipes 52 to the rear end of the nib 2, and it may take a considerable amount of time to be able to write at the time of initial ink ejection. The front end of each of the communication pipes 52 may be located in front of the rear end of the nib 2 or may be located in the rear of the rear end of the nib 2.

(Configuration 14)
In the direct liquid writing instrument 1 of any one of the configurations 1 to 13, it is preferable that the distance between the front end of each of the communication pipes 52 and the rear end of the nib 2 is set equal (configuration 14).

In the direct liquid writing instrument 1 (configuration 14), the ink from the ink tank 7 is discharged from the front end opening of any one of the communication pipes 52 to the rear of the pen tip 2 during the initial ink discharge. Even when supplied to the end, writing can be performed in a certain time without variation.

(Configuration 15)
In the direct liquid writing instrument 1 according to any one of the configurations 1 to 14, it is preferable that the front end surface and the rear end surface of the ink occlusion body 3 communicate with outside air (configuration 15).

The direct liquid writing instrument 1 (Configuration 15) 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 52 inside the ink storage body 3 is passed from the vicinity of the front end of the communication pipe 52 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 can be smoothly moved from the inside of the ink occlusion body 3 near the front end of the tube 52 toward the rear end of the ink occlusion body 3.

(Communication pipe)
In the present invention, the communication pipe 52 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 52 may be any of, for example, a circle, an ellipse, or a polygon such as a triangle or a quadrangle. Moreover, the number of the said communicating pipe | tubes 52 should just be two or more (namely, 2 or more), for example, 2, 3, 4, 5 or 6 etc. are mentioned.

Each of the communication pipes 52 extends in the front-rear direction, and a flow passage 52a is provided through each of the communication pipes 52 in the front-rear direction. Further, the plurality of communication pipes 52 only need to have a structure in which a plurality of independent flow passages 52a are formed in parallel therein. For example, each of the communication pipes 52 is separated in the radial direction, Examples include a configuration in which the side walls of the communication pipe 52 are connected to each other, or a configuration in which a small diameter communication pipe is disposed inside a large diameter communication pipe.

Further, it is preferable that the front ends of the communication pipes 52 are 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 52 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 52 include an inclined cut surface, a vertical surface, a conical surface, and a convex curved surface. Further, the rear end of each of the communication pipes 52 may protrude rearward from the rear surface of the partition wall 51 and may be positioned in the ink tank 7 or the connection pipe 53.

Further, an ink absorber having a capillary gap (for example, a porous material such as a fiber processed body or an open cell foam) may be accommodated in the communication pipe 52. The capillary force of the ink absorber is preferably set to be smaller than the capillary force of the vicinity of the front end (high density portion 31) of each of the communicating tubes 52 inside the ink storage member 3.

(Ink storage)
In the present invention, the ink occlusion body 3 may be made of a member having continuous pores that can be impregnated with ink (that is, a porous material). Resin processed body, felt resin processed body, felt needle punch processed body, synthetic resin open cell body, and the like. In addition, the ink occlusion body 3 may be configured to have an outer skin made of a synthetic resin film or the like on 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.

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

According to the first aspect of the present invention, there is no possibility that ink in the ink tank leaks from the pen tip side, and air and ink are quickly changed at the time of initial ink discharge, and writing can be performed in a short time.

According to the second aspect of the present invention, the bending strength of the communication pipe with respect to the partition wall is improved, the bending of the communication pipe can be suppressed, and stable contact between the rear end surface of the ink occlusion body and the contact wall portion is possible. .

According to the third aspect of the present invention, the bending strength of the communication pipe with respect to the partition wall can be further improved, and the bending of the communication pipe can be suppressed.

According to the present invention, the front end opening of each communicating pipe can be reliably liquid-sealed with impregnated ink, and the density of the ink occlusion body can be increased even when no ink is supplied from the ink tank such as the pen tip upward. It becomes possible to write sufficiently with the ink impregnated in the part.

(First embodiment)
A direct liquid writing instrument 1 according to a first embodiment of the present invention is shown in FIGS.
The direct liquid writing instrument 1 of the present embodiment includes a pen tip 2, an ink occlusion body 3 connected to the rear end of the pen nib 2, an intermediate member 5 disposed behind the ink occlusion body 3, and the intermediate An ink tank 7 disposed behind the member 5, a shaft cylinder 4 that holds the pen tip 2 at the front end and accommodates the ink occlusion body 3, the intermediate member 5, and the ink tank 7 inside, It comprises a tail plug 6 detachably screwed into the rear end opening of the shaft tube 4.

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

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

-Shaft cylinder The said shaft cylinder 4 is a cylindrical body obtained by injection molding of synthetic resins (for example, polypropylene, polyethylene, etc.). The shaft cylinder 4 includes a tip 41 that holds the outer peripheral surface of the pen nib 2 and a main body 42 that is connected to the rear of the tip 41 and accommodates the ink storage body 3, the partition wall 51, and the ink tank 7. Become.

A plurality of ribs 43 extending in the front-rear direction are integrally formed on the inner surface of the shaft cylinder 4 (that is, from the inner surface of the tapered portion 41 to the front inner surface of the main body portion 42). In the rib 43, a step-shaped regulating wall 43 a is formed in the vicinity of the connecting portion between the tip 41 of the shaft cylinder 4 and the main body 42. The front end surface of the ink occlusion body 3 is in axial contact with the restriction wall portion 43a, and the outer circumferential surface of the ink occlusion body 3 is pressed and held by the rib 43 on the inner surface of the front portion of the main body portion. The outer peripheral surface of the nib 2 is pressed and held by the rib 43 on the inner surface of the tip 41. A cylindrical wall portion 43b is integrally formed between a portion of the rib 43 that holds the outer peripheral surface of the nib 3 and a portion that holds the outer peripheral surface of the ink occlusion body 3.

By the ribs 43, between the outer peripheral surface of the ink storage body 3 and the inner surface of the main body 42, between the front end surface of the ink storage body 3 and the inner surface of the shaft cylinder 4, and between the outer peripheral surface of the pen tip 2 and the inner surface of the tip 41. 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 4, and the rear side of the air passage 10 is in communication with the rear end surface of the ink occlusion body 3. That is, the air passage 10 communicates the front end surface of the ink storage body 3 and the rear end surface of the ink storage body 3 with the outside air.

Intermediate member The intermediate member 5 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 5 includes a partition wall 51 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 51 and are pierced and connected to the inside of the ink storage body 3 (specifically 2) communicating pipes 52, a connecting pipe 53 protruding rearward from the rear surface of the partition wall 51 and inserted into the front end opening of the ink tank 7, and a rearward projecting rear surface of the partition wall 51 and a shaft. And an attachment tube portion 54 fixed to the inner surface of the tube 4 (the inner surface of the main body portion 42). The ink occlusion body 3 is accommodated in a space formed by the shaft cylinder 4 and the partition wall 51 (that is, the occlusion body accommodation portion). In the present embodiment, the mounting tube portion 54 surrounds the outer periphery of the base portion of the connection pipe 53. The connecting pipe 53 is integrally formed with a protruding piece 53a for pressing one side of the plug 71. The partition wall 51 has a disk shape, and each of the communication pipes 52, the connection pipe 53, and the attachment cylinder part 54 have a cylindrical shape.

The partition wall 51, the respective communication pipes 52, the connection pipes 53, and the mounting cylinders 54 are integrally connected. That is, the partition 51, the communication pipe 52, the connection pipe 53, and the attachment cylinder part 54 can be comprised by 1 part with the intermediate member 5. FIG.

Abutting wall portion As shown in FIG. 2 (2), an abutting wall portion 51 a made of a plate-like rib is integrally formed on the front surface of the partition wall 51. The abutting wall portion 51 a abuts on the rear end surface of the ink occlusion body 3. A gap 9 communicating with the outside air is formed between the partition wall 51 and the rear end surface of the ink occluding body 3 by the contact wall portion 51a. The gap 9 is communicated with the outside air through the air passage 10. The contact wall 51a is formed in a radial cross section (here, a cross shape). A part of the abutting wall 51a is formed between the bases of the respective communication pipes 52, and the base side walls of the respective communication pipes 52 are connected. Thereby, the bending strength of each connecting pipe improves, and the bending with respect to the partition 51 of each communicating pipe 52 can be suppressed. In the present invention, the abutting wall portion 51a may be constituted by an annular step portion formed on the outer peripheral surface of the base portion of each communication pipe. In the present invention, the abutting wall portion 51a may be constituted by a protruding portion that does not connect to the outer peripheral surface of the base portion of each communication pipe.

-Communication pipe The flow path 52a is provided in the inside of each of the communication pipes 52 in the axial direction, and the flow path 52a is opened at both ends of each of the communication pipes 52. The front ends of the communication pipes 52 are opened in front of the ink storage body 3, and the rear ends of the communication pipes 52 are opened in the ink tank 7 behind the ink storage body 3. Since each of the communication pipes 52 is arranged in parallel between the ink storage body 3 and the ink tank 7, a plurality of independent circulations are provided between the ink storage body 3 and the ink tank 7 behind the ink storage body 3. A path 52a is provided in parallel. Each flow passage 52 a of the communication pipe 52 is penetrated to a location away from the axis of the partition wall 51 located in the connection pipe 53.

The front end of each of the communication pipes 52 is inserted by being stabbed forward from the rear end of the ink storage body 3, and finally is positioned in the vicinity of the rear end of the pen tip 2 in front of the ink storage body 3. When the front ends of the communication pipes 52 are inserted into the ink storage body 3, the front ends of the communication pipes 52 press and compress the fibers of the ink storage body 3 forward. Accordingly, the fiber density of the ink storage body 3 in the vicinity of the front end of each communication pipe 52 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 52. 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. Since the front end of each of the communication pipes 52 is located in front of the ink storage body 3, the high density portion 31 is formed in front of the ink storage body 3, and the low density portion 31 is behind the high density portion 31. A density portion 32 is formed. Each of the communication pipes 52 penetrates the low density part 32 from the rear to the front, and the front end of each of the communication pipes 52 is positioned inside the high density part 31 ahead of the low density part 32. In this embodiment, the porosity (porosity) of the low density portion 32 is set to 85% to 93%, and the difference between the porosity of the low density portion 32 and the porosity of the high density portion 31 is set. Is set to 20%.

  The front end of each of the communication pipes 52 is disposed at a position spaced radially outward from the axis of the ink storage body 3. Specifically, the front ends of the communication pipes 52 are arranged at equal intervals on the same circumference centered on the axis of the ink storage body 3. In this embodiment, since there are two communication pipes 52, the communication pipes 52 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 52 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The ink occluding body 3 is connected through the inside front (high density portion 31) so that ink can be distributed. Further, the front end of each of the communication pipes 52 is located slightly behind the rear end of the pen tip 2.

In the present embodiment, the axial length L of the entire ink occlusion body 3 is set to 30 mm. In this embodiment, the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 52 are both set to 4 mm. Therefore, the axial distances S1 and S2 from the front end of the ink storage body 3 to the front ends of the communication pipes 52 are 13.3% of the overall length L of the ink storage body 3 (that is, 3). % To 50%). In this embodiment, the axial distances T1 and T2 between the front end of each of the communication pipes 52 and the rear end of the pen tip 2 are both set to 1 mm (ie, within 10 mm).

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

The inner surface of the front end opening of the ink tank 7 is detachably fitted to the outer surface of the connecting pipe 53 of the intermediate member 5. When ink 8 in the ink tank 7 is consumed and writing becomes impossible, the ink tank 7 is removed from the connection pipe 53, and the connection pipe 53 is connected to the front end opening of a new ink tank 7 filled with the ink 8. Insert it. 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 53 is inserted into the front end opening of the ink tank 7, the plug 71 is pressed backward by the protruding piece 53 a of the connecting pipe 53, the plug 71 is removed, and the front end opening of the ink tank 7 is opened. It is plugged.

(Second Embodiment)
3 and 4 show a second embodiment of the present invention.
This embodiment is a modification of the first embodiment, and is different from the first embodiment in that the mounting cylinder portion 54 projects forward from the front surface of the partition wall 51 and each communication pipe 52 base portion. And the abutting wall portion 51a is greatly projected forward from the front surface of the partition wall 51. In particular, by adjusting the axial length of the abutting wall portion 51a, it is possible to freely set the axial length so that the writing instrument body can be easily gripped, and the axial length of the ink tank 7 (that is, the ink tank). Capacity) and the axial length of the ink occlusion body 3 need not be changed. Note that other configurations in the present embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

It is a longitudinal cross-sectional view which shows the pen tip downward state of the 1st Embodiment of this invention. (1) is the AA line expanded sectional view of FIG. 1, (2) is the BB line expanded sectional view of FIG. 1, (3) is the CC line expanded sectional view of FIG. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 2nd Embodiment of this invention. (1) is an enlarged sectional view taken along line DD in FIG. 3, (2) is an enlarged sectional view taken along line EE in FIG. 3, and (3) is an enlarged sectional view taken along line FF in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Direct liquid type writing instrument 2 Pen tip 3 Ink occlusion body 31 High density part 32 Low density part 4 Shaft cylinder 41 Tip detail 42 Main body part 43 Rib 43a Restriction wall part 43b Cylindrical wall part 5 Intermediate member 51 Partition wall 51a Contact wall part 52 Communication pipe 52a Flow passage 53 Connection pipe 53a Projection piece 54 Mounting cylinder portion 6 Tail plug 7 Ink tank 71 Plug body 8 Ink 9 Clearance 10 Air passage S1, S2 Axial direction from the front end of the ink occlusion body to the front end of the communication pipe Distance T1, T2 Axial distance between the front end of the communication tube and the rear end of the nib

Claims (4)

A pen tip, an ink occlusion body connected to the rear end of the pen nib, an ink tank that is disposed behind the ink occlusion body and directly stores ink, and between the ink tank and the ink occlusion body A direct liquid type writing instrument comprising a plurality of communication pipes, each having a plurality of communication pipes, provided with a partition wall between an ink storage body and an ink tank, and projecting each of the communication pipes forward from the front surface of the partition wall. The front end of each of the communication pipes is positioned inside the ink storage body, and a contact wall portion that contacts a part of the rear end surface of the ink storage body is formed on the front surface of the partition wall, A direct liquid writing instrument characterized in that a gap is formed between the rear end surface of the ink occlusion body and the front surface of the partition wall so as to allow air and air to pass through when the rear end surface of the ink occlusion body abuts. The direct liquid writing instrument according to claim 1, wherein the contact wall portion is connected to each base portion of the communication pipe and the front surface of the partition wall. The direct liquid writing instrument according to claim 2, wherein the contact wall portion connects the base portions of the communication pipes to each other. The ink occlusion body includes a high-density portion and a low-density portion connected to the rear of the high-density portion, and the front end of each of the communication pipes 52 and the rear end of the pen nib are positioned in the high-density portion. The direct liquid type writing instrument according to any one of claims 1 to 3.

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