JP2009012191A - Direct liquid type writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct liquid type writing implement surely preventing ink leakage from a penpoint side even when the pressure in an ink tank rises. <P>SOLUTION: The direct liquid type writing implement 1 comprises a penpoint 2, an ink occluding body 3 inserted with a rear end of the penpoint 2, an ink tank 8 disposed in the rear of the ink occluding body 3 and storing the ink 9 directly, and a plurality of communication tubes 6 connecting the ink tank 8 with the ink occluding body 3. The front end of each communication tube 6 is inserted from the rear end of the ink occluding body 3 forward to pressurizingly compress the inside of the ink occluding body 3. Each front end of the communication pipes 6 is positioned inside the ink occluding body 3. V2/V1 is in a range of 0.02-0.3, and (V2+V3)/V1 is in a range of 0.03-0.4, wherein, V1 is the volume of the ink occluding body 3, and V2 is the volume of the insertion part of the communication tube 6 into the ink occluding body 3. <P>COPYRIGHT: (C)2009,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.

Conventionally, in this type of direct liquid writing instrument, Patent Literature 1 and Patent Literature 2 include a pen tip, an ink occlusion body connected to the rear end of the pen nib, and a rear side of the ink occlusion body, It consists of an ink tank that directly stores ink and a plurality of communication pipes connecting the ink tank and the ink storage body, and the front end of each communication pipe is inserted forward from the rear end of the ink storage body. Thus, there is disclosed a direct liquid writing instrument in which the inside of the ink occlusion body is pressed and compressed, and the front end of each of the communication pipes is positioned inside the ink occlusion body.

JP 2006-212884 A JP 2006-240281 A

In the case of the conventional direct liquid writing instrument, when the front end of each communication tube is inserted forward from the rear end of the ink storage body, the ink storage body cannot be properly pressed and compressed due to variations in manufacturing, and the ink storage body There is a possibility that the fiber density cannot be set sufficiently high. As a result, the liquid sealability of the front end opening of the communication pipe is lowered, and when the pressure in the ink tank rises due to a temperature change or the like, the ink may leak to the outside.

The present invention solves the above-mentioned conventional problems, and the fiber density of the ink occlusion body in the vicinity of the front end of each communication pipe is determined from the density of the ink occlusion body in the portion other than the vicinity of the front end of each communication pipe. Therefore, it is intended to provide a direct liquid type writing instrument that can reliably prevent ink leakage from the pen tip side even when the pressure in the ink tank rises.

(First invention)
The first invention of the present application is a pen tip 2, an ink storage body 3 into which the rear end of the pen tip 2 is inserted, and an ink tank that is disposed behind the ink storage body 3 and stores ink 9 directly. 8 and a plurality of communication pipes 6 connecting the ink tank 8 and the ink storage body 3, and the front end of each communication pipe 6 is inserted forward from the rear end of the ink storage body 3. This is a direct liquid writing instrument in which the inside of the ink occlusion body 3 is pressed and compressed, and the front end of each of the communication pipes 6 is located inside the ink occlusion body 3, and the volume of the ink occlusion body 3 is set to V1. When the volume of the insertion portion of the communication pipe 6 into the ink occlusion body 3 is V2, the value of V2 / V1 is in the range of 0.02 to 0.3 (preferably 0.03 to 0.1). There is a requirement (claim 1).

In the direct liquid writing instrument 1 of the first invention, the value of V2 / V1 is set in the range of 0.02 to 0.3 (preferably 0.03 to 0.1). Can be appropriately pressed and compressed, and the fiber density of the ink occlusion body 3 in the vicinity of the front end of each communication pipe 6 is surely set higher than the density of the ink occlusion body 3 in the portion other than the vicinity of the front end of each communication pipe 6. Even if the pressure in the ink tank 8 rises, there is no possibility that the ink leaks from the pen tip 2 side to the outside.

(Second invention)
The second invention of the present application is a pen nib 2, an ink occlusion body 3 into which the rear end of the nib 2 is inserted, and an ink tank that is disposed behind the ink occlusion body 3 and stores ink 9 directly. 8 and a plurality of communication pipes 6 connecting the ink tank 8 and the ink storage body 3, and the front end of each communication pipe 6 is inserted forward from the rear end of the ink storage body 3. This is a direct liquid writing instrument in which the inside of the ink occlusion body 3 is pressed and compressed, and the front end of each of the communication pipes 6 is located inside the ink occlusion body 3, and the volume of the ink occlusion body 3 is set to V1. When the volume of the insertion portion of the communicating tube 6 into the ink storage body 3 is V2, and the volume of the insertion portion of the pen tip 2 into the ink storage body 3 is V3, the value of (V2 + V3) / V1. Of 0.03 to 0.4 (preferably 0.05 to 0.15) Be in circumference and (claim 2) the requirements.

In the direct liquid writing instrument 1 of the second invention, the value of (V2 + V3) / V1 is set in the range of 0.03 to 0.4 (preferably 0.05 to 0.15). 3 can be appropriately pressed and compressed, and the fiber density of the ink occlusion body 3 in the vicinity of the front end of each communication pipe 6 is surely higher than the density of the ink occlusion bodies 3 in the portions other than the vicinity of the front end of each communication pipe 6. Even if the pressure in the ink tank 8 rises, there is no possibility that the ink leaks out from the pen tip 2 side.

(Third invention)
The third invention of the present application is a pen tip 2, an ink occlusion body 3 into which the rear end of the pen nib 2 is inserted, and an ink tank which is disposed behind the ink occlusion body 3 and directly stores ink 9. 8 and a plurality of communication pipes 6 connecting the ink tank 8 and the ink storage body 3, and the front end of each communication pipe 6 is inserted forward from the rear end of the ink storage body 3. This is a direct liquid writing instrument in which the inside of the ink occlusion body 3 is pressed and compressed, and the front end of each of the communication pipes 6 is located inside the ink occlusion body 3, and the volume of the ink occlusion body 3 is set to V1. When the volume of the insertion portion of the communication pipe 6 into the ink storage body 3 is V2, and the volume of the insertion portion of the pen tip 2 into the ink storage body 3 is V3, the value of V2 / V1 is 0. 0.02 to 0.3 (preferably 0.03 to 0.1), One, the requirement (V2 + V3) / value of V1 is in the range of 0.03 to 0.4 (preferably 0.05 to 0.15) (claim 3).

In the direct liquid writing instrument 1 of the third invention, the value of V2 / V1 is set in the range of 0.02 to 0.3 (preferably 0.03 to 0.1), and (V2 + V3) / V1. Is set in the range of 0.03 to 0.4 (preferably 0.05 to 0.15), the ink occlusion body 3 can be appropriately pressed and compressed, and the ink in the vicinity of the front end of each communication pipe 6 can be obtained. The fiber density of the occlusion body 3 can be reliably set higher than the density of the ink occlusion body 3 in portions other than the vicinity of the front end of each of the communication pipes 6, and even when the pressure in the ink tank 8 rises, the pen tip 2 There is no risk of ink leaking from the side to the outside.

In the first, second and third inventions, the volume V1 of the ink occlusion body 3 is the volume of the fiber portion of the ink occlusion body 3 and includes the volume of the insertion portion of the communication pipe 6, The volume of the outer skin portion is not included. The volume V2 of the insertion portion of the communication tube 6 into the ink storage body 3 is the sum of the volumes of the insertion portions of the communication tubes 6, that is, the volume of each communication tube 6 inserted into the ink storage body 3. The sum of the volumes formed by the outer surfaces. The volume V3 of the insertion portion of the nib 2 into the ink occlusion body 3 refers to the volume constituted by the outer surface of the nib 2 inserted into the ink occlusion body 3.

(Fourth invention)
According to a fourth invention of the present application, in any one of the first to third inventions, a partition wall 51 is provided between the ink occlusion body 3 and the ink tank 8, and the communication pipe is disposed in front of the front surface of the partition wall 51. 6 is protruded, and a plate-like rib 51 a protruding in the axial direction is formed on the rear end face of the ink storage body 3 on the front surface of the partition wall 51, and into the ink storage body 3 at the front end of each communication pipe 6. When the insertion is completed, the plate-like rib 51a and the rear end surface of the ink storage body 3 are in contact with each other in the axial direction (Claim 5).

In the direct liquid writing instrument 1 according to the fourth aspect of the present invention, when the insertion of the front end of each of the communication pipes 6 into the ink storage body 3 is completed, the plate-like rib 51a and the rear end surface of the ink storage body 3 are By abutting in the axial direction, sufficient air permeability of the rear end surface of the ink storage body 3 can be obtained, and stable contact with the rear end surface of the ink storage body 3 can be obtained. The amount of insertion V2 of each communication pipe 6 into the ink storage body 3 (that is, the amount of compressive deformation of the fibers in the ink storage body 3) is kept constant by stable contact with the rear end surface of the ink storage body 3. Can do. The plate-like ribs are preferably provided in a radial cross section so that the bases of the communication pipes 6 can be connected to each other and at the same time a stable contact with the rear end surface of the ink storage body 3 can be obtained.

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

Each of the communication pipes 6 extends in the front-rear direction, and a flow passage 61 is provided through each of the communication pipes 6 in the front-rear direction. That is, each of the communication pipes 6 has openings at both ends (front end and rear end).

Further, the plurality of communication pipes 6 may have a configuration in which a plurality of independent flow passages 61 are formed in parallel therein, for example, a configuration in which each communication pipe is separated in the radial direction, Examples include a configuration in which the side walls of the communication pipe are connected to each other, or a configuration in which a small diameter communication pipe is disposed inside the large diameter communication pipe.

The front ends of the communication pipes 6 are preferably located at equal intervals on the same circumference with the nib 2 as the center. Further, the front end of each of the communication pipes 6 may be opened forward in the axial direction or may be opened outward in the radial direction. Examples of the shape of the front end of each communication pipe 6 include an inclined cut surface, a vertical surface, a conical surface, and a convex curved surface. The rear end of each of the communication pipes 6 may be opened rearward in the axial direction or may be opened radially outward. The rear end of each of the communication pipes 6 may protrude rearward from the rear surface of the partition wall 51.

(Ink storage)
In the present invention, the fiber bundle of the ink occlusion body 3 is made of, for example, a fiber bundle made of a synthetic resin (for example, polyester, acrylic, nylon). The outer cover 31 of the ink occlusion body 3 is formed of a cylindrical extruded body of a synthetic resin (for example, polypropylene or polyethylene). The outer skin 31 is preferably heat-sealed with a fiber at the time of extrusion molding. However, after the extrusion molding, the outer skin 31 may be heat-sealed by new heating or may be bonded to the fiber after extrusion molding. Is possible.

(Nib)
In the present invention, the nib 2 is, for example, a fiber bundle resin processed body, a fiber bundle heat fusion processed body, a felt processed body, a pipe-shaped pen body, and a fountain pen type plate-shaped pen body having a slit at the tip. A brush pen body, a porous foam of a synthetic resin, a ballpoint pen tip, an extruded body of a synthetic resin having an axial ink guide path, and the like. The material constituting the rear end of the nib 2 may be at least 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. In the present invention, the nib 2 includes an ink guide member.

(Ink tank)
The ink tank 8 has, for example, a configuration in which the ink tank 8 is directly formed on the writing instrument body (that is, the ink tank 8 forms a part of the writing instrument body), or a structure in which the ink tank 8 is accommodated in the writing instrument body. Is mentioned. In the present invention, the ink 9 stored in the ink tank 8 is specifically a writing instrument ink (for example, water-based ink, oil-based ink) or a coating liquid (for example, cosmetic liquid, correction liquid, adhesive, Paint, liquid medicine, etc.).

According to the present invention, the fiber density of the ink occlusion body in the vicinity of the front end of each communication pipe can be reliably set higher than the density of the ink occlusion bodies in the portions other than the vicinity of the front end of each communication pipe.

(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 according to the present embodiment includes a nib 2, an ink occlusion body 3 connected to the rear end of the nib 2, an intermediate member 5 disposed behind the ink occlusion body 3, and the An ink tank 8 disposed behind the intermediate member 5, and 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 8 therein. The tail plug 7 is detachably screwed into the rear end opening of the shaft tube 4 and the cap 12 is detachably provided on the pen tip 2 side.

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

Ink occlusion body The ink occlusion body 3 includes a cylindrical synthetic resin fiber bundle (for example, a polyester fiber bundle) processed body and a cylindrical outer skin 31 covering the outer peripheral surface of the fiber bundle. The outer skin 31 is made of a cylindrical extruded body of a synthetic resin (for example, polypropylene, polyethylene, etc.). The outer skin 31 is heat-sealed to the outer peripheral surface of the fiber bundle during extrusion molding. 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. In the present embodiment, the thickness of the outer skin 31 of the ink occlusion body 3 is set to 0.1 mm to 0.4 mm, and the single fiber fineness of the ink occlusion body 3 is set to 3 denier to 5 denier. The crimp rate of the ink occlusion body 3 is set to 10% to 30%.

-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 for holding the outer peripheral surface of the 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 8. 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 (the front end of the outer skin 31 of the ink occlusion body 3) abuts on the regulation wall 43a in the axial direction, and the outer peripheral surface of the ink occlusion body 3 contacts the rib 43 on the inner surface of the front portion of the main body portion The outer peripheral surface of the outer skin 31 of the ink occluding body 3 is held in pressure contact. 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 2 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 (the outer peripheral surface of the outer skin 31 of the ink storage body 3) and the inner surface of the main body portion 42, between the front end surface of the ink storage body 3 and the inner surface of the shaft cylinder 4, The air passage 11 is formed between the outer peripheral surface of the nib 2 and the inner surface of the tip 41. The front side of the air passage 11 is opened to the outside from the front end of the shaft cylinder 4, and the rear side of the air passage 11 is in communication with the rear end surface of the ink storage body 3. That is, the air passage 11 allows the front end surface of the ink storage body 3 and the rear end surface of the ink storage body 3 to communicate 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 8, 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) communication pipes 6, a connection pipe 52 projecting rearward from the rear surface of the partition wall 51 and being inserted into the front end opening of the ink tank 8, and projecting rearward from the rear surface of the partition wall 51 and a shaft. And an attachment tube portion 53 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 53 surrounds the outer periphery of the base portion of the connecting pipe 52. The connecting pipe 52 is integrally formed with a protruding piece 52a for pressing one side of the plug 81. The partition wall 51 has a disk shape, and each of the communication pipe 6, the connection pipe 52, and the mounting cylinder portion 53 has a cylindrical shape.

The partition wall 51, each communication pipe 6, connection pipe 52, and mounting cylinder portion 53 are integrally connected. That is, the partition member 51, the communication pipe 6, the connection pipe 52, and the mounting cylinder part 53 can be configured by one part by the intermediate member 5.

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 comes into contact with the rear end surface of the ink storage body 3 (the rear end of the outer skin 31 of the ink storage body 3). A gap 10 communicating with the outside air is formed between the partition wall 51 and the rear end surface of the ink storage body 3 by the contact wall portion 51a. The gap 10 communicates with the outside air through the air passage 11. The contact wall 51a is formed in a radial cross section (here, a cross shape). A part of the abutting wall portion 51a is formed between the base portions of the communication pipes 6, and the base side walls of the communication pipes 6 are connected. Thereby, the bending strength of each connecting pipe is improved, and the bending of each communicating pipe 6 with respect to the partition wall 51 can be suppressed.

-Communication pipe The flow path 61 is provided in the inside of each of the communication pipes 6 in the axial direction, and the flow path 61 is opened at both ends of each of the communication pipes 6. The front ends of the communication pipes 6 are opened in front of the ink storage body 3, and the rear ends of the communication pipes 6 are opened in the ink tank 8 behind the ink storage body 3. Since each of the communication pipes 6 is arranged in parallel between the ink storage body 3 and the ink tank 8, a plurality of independent flow paths are provided between the ink storage body 3 and the ink tank 8 behind the ink storage body 3. A path 61 is provided in parallel. Each flow passage 61 of the communication pipe 6 is penetrated to a part of the partition wall 51 located in the connection pipe 52 away from the axis.

The front end of each of the communication pipes 6 is inserted forward by being inserted from the rear end of the ink storage body 3, and finally is positioned in the vicinity of the rear end of the pen tip 2 in front of the ink storage body 3. When the front ends of the communication pipes 6 are inserted into the ink storage body 3, the front ends of the communication pipes 6 press and compress the fibers of the ink storage body 3 forward. Thereby, the fiber density of the ink storage body 3 in the vicinity of the front end of each communication pipe 6 is set higher than the fiber density of the ink storage body 3 in a portion other than the vicinity of the front end of each communication pipe 6. That is, a high density portion 32 having a high fiber density (a high density portion 32 having a high capillary force) and a low density portion 33 having a low fiber density (a low density portion 33 having a low capillary force) are formed inside the ink occlusion body 3. The Since the front end of each of the communication pipes 6 is located in front of the ink storage body 3, the high density portion 32 is formed in front of the ink storage body 3, and the low density portion 32 is behind the high density portion 32. A density portion 33 is formed. The high density part 32 and the low density part 33 are connected. Each of the communication pipes 6 penetrates through the low density part 33 from the rear to the front, and the front end of each of the communication pipes 6 is positioned inside the high density part 32 ahead of the low density part 33.

In the present embodiment, the volume of the ink occlusion body 3 is V1, the volume of the insertion portion of the communication tube 6 into the ink occlusion body 3 is V2, and the insertion portion of the pen tip 2 into the ink occlusion body 3 is set. When V3 is V3, the value of V2 / V1 is in the range of 0.03 to 0.1, and the value of (V2 + V3) / V1 is in the range of 0.05 to 0.15. In the present embodiment, the porosity (porosity) of the low density portion 33 is set to 85% to 93%, and the porosity of the high density portion 32 is lower than the porosity of the low density portion 33. The difference between the porosity of the low density portion 33 and the porosity of the high density portion 32 is set to 20%.

  The front end of each of the communication pipes 6 is disposed at a position that is radially outward from the axis of the ink storage body 3. Specifically, the front ends of the communication pipes 6 are arranged at equal intervals on the same circumference centered on the axis of the ink storage body 3. In the present embodiment, since there are two communication pipes 6, the communication pipes 6 are arranged at 180 ° symmetrical positions with respect to the axis of the ink occlusion body 3. Since the nib 2 is located at the axial center of the ink occlusion body 3, the front end of each of the communication pipes 6 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The ink occluding body 3 is connected to the pen tip 2 through the inside front (high density portion 32) so that ink can be distributed. Further, the front end of each of the communication pipes 6 is located slightly behind the rear end of the pen tip 2.

Ink tank The ink tank 8 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 9 is stored directly in the ink tank 8. The ink 9 stored in the ink tank 8 may be either water-based ink or oil-based ink.

The outer surface of the connecting pipe 52 of the intermediate member 5 is detachably fitted to the inner surface of the front end opening of the ink tank 8. When ink 9 in the ink tank 8 is consumed and writing becomes impossible, the ink tank 8 is removed from the connection pipe 52, and the connection pipe 52 is connected to the front end opening of a new ink tank 8 filled with the ink 9. Insert it. Thereby, writing becomes possible again. A front end opening of the new ink tank 8 is closed by a plug 81. When the connecting pipe 52 is inserted into the front end opening of the ink tank 8, the plug 81 is pushed backward by the protruding piece 52 a of the connecting pipe 52, the plug 81 is removed, and the front end opening of the ink tank 8 is opened. It is plugged.

(Second Embodiment)
4 and 6 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 53 protrudes forward from the front surface of the partition wall 51 and each communication pipe 6 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 to easily grip the writing instrument body, and the axial length of the ink tank 8 (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.

(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 according to the present embodiment includes a nib 2, an ink occlusion body 3 connected to the rear end of the nib 2, an intermediate member 5 disposed behind the ink occlusion body 3, and the An ink tank 8 disposed behind the intermediate member 5, and 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 8 therein. The tail plug 7 is detachably screwed into the rear end opening of the shaft tube 4 and the cap 12 is detachably provided on the pen tip 2 side.

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

Ink occlusion body The ink occlusion body 3 includes a cylindrical synthetic resin fiber bundle (for example, a polyester fiber bundle) processed body and a cylindrical outer skin 31 covering the outer peripheral surface of the fiber bundle. The outer skin 31 is made of a cylindrical extruded body of a synthetic resin (for example, polypropylene, polyethylene, etc.). The outer skin 31 is heat-sealed to the outer peripheral surface of the fiber bundle during extrusion molding. 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. In the present embodiment, the thickness of the outer skin 31 of the ink occlusion body 3 is set to 0.1 mm to 0.4 mm, and the single fiber fineness of the ink occlusion body 3 is set to 3 denier to 5 denier. The crimp rate of the ink occlusion body 3 is set to 10% to 30%.

-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 for holding the outer peripheral surface of the 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 8. 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 (the front end of the outer skin 31 of the ink occlusion body 3) abuts on the regulation wall 43a in the axial direction, and the outer peripheral surface of the ink occlusion body 3 contacts the rib 43 on the inner surface of the front portion of the main body portion The outer peripheral surface of the outer skin 31 of the ink occluding body 3 is held in pressure contact. 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 2 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 (the outer peripheral surface of the outer skin 31 of the ink storage body 3) and the inner surface of the main body portion 42, between the front end surface of the ink storage body 3 and the inner surface of the shaft cylinder 4, The air passage 11 is formed between the outer peripheral surface of the nib 2 and the inner surface of the tip 41. The front side of the air passage 11 is opened to the outside from the front end of the shaft cylinder 4, and the rear side of the air passage 11 is in communication with the rear end surface of the ink storage body 3. That is, the air passage 11 allows the front end surface of the ink storage body 3 and the rear end surface of the ink storage body 3 to communicate 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 8, 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) communication pipes 6, a connection pipe 52 protruding rearward from the rear surface of the partition wall 51 and inserted into the front end opening of the ink tank 8, and an axial direction from the front surface or rear surface of the partition wall 51. And a mounting cylinder portion 53 that protrudes and is fixed to the inner surface of the shaft cylinder 4 (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). The mounting cylinder 53 surrounds the outer periphery of the base of each communication pipe 6 or the outer periphery of the connecting pipe 52 in front of the partition wall 51. A notch is formed at the rear end of the connecting pipe 52. Due to the notch, a protruding piece 52a for pressing one side of the plug 81 is integrally formed at the rear end of the connecting pipe 52. The partition wall 51 has a disk shape, and each of the communication pipe 6, the connection pipe 52, and the mounting cylinder portion 53 has a cylindrical shape. The projecting piece 52a has an arc shape in cross section.

The partition wall 51, the respective communication pipes 6 (that is, the communication pipe 6a and the communication pipe 6b), the connection pipe 52, and the mounting cylinder portion 53 are integrally connected. That is, the partition member 51, the communication pipe 6, the connection pipe 52, and the mounting cylinder part 53 can be configured by one part by the intermediate member 5.

Abutting wall portion As shown in FIG. 9 (1), 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 51a is in contact with the rear end surface of the ink storage body 3 (the rear end of the outer skin 31 of the ink storage body 3). A gap 10 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 10 communicates with the outside air through the air passage 11. A part of the abutting wall portion 51a is formed between the base portions of the communication pipes 6, and the base side walls of the communication pipes 6 are connected. Thereby, the bending strength of each communication pipe 6 is improved, and bending of each communication pipe 6 with respect to the partition wall 51 can be suppressed. The abutting wall portion 51a has a transverse cross section that is branched, radial, or cross-shaped.

-Communication pipe The flow path 61 is provided in the inside of each of the communication pipes 6 in the axial direction, and the flow path 61 is opened at both ends of each of the communication pipes 6. The front end of each of the communication pipes 6 is located inside the ink storage body 3 and is opened in front of the ink storage body 3. The rear end of each of the communication pipes 6 is opened in the ink tank 8 behind the ink storage body 3. In the plurality of communication pipes 6, one communication pipe 6b protrudes rearward from the rear surface of the partition wall 51, and the rear end of the communication pipe 6b is positioned in the ink tank 8 (in the connection pipe 52). The other communication pipe 6a does not protrude rearward from the rear surface of the partition wall 51 (that is, the rear end of the other communication pipe 6a coincides with the rear surface of the partition wall 51). Since each of the communication pipes 6 is arranged in parallel between the ink storage body 3 and the ink tank 8, a plurality of independent flow paths are provided between the ink storage body 3 and the ink tank 8 behind the ink storage body 3. A path 61 is provided in parallel. Each flow passage 61 of the communication pipe 6 is penetrated to a part of the partition wall 51 located in the connection pipe 52 away from the axis.

The position in the front-rear direction of the rear end of the communication pipe 6b protruding rearward from the rear surface of the partition wall 51 substantially matches the rear end of the connection pipe 52 (that is, the rear end of the projecting piece 52a) or the rear of the connection pipe 52. It is positioned slightly forward from the end (that is, the rear end of the protruding piece 52a). That is, the rear end of the communication pipe 6b that protrudes rearward from the rear surface of the partition wall 51 is not greatly protruded rearward from the rear end of the connection pipe 52 (that is, the rear end of the protruding piece 52a). The communication pipe 6b protruding rearward from the rear surface of the partition wall 51 is disposed close to the inner surface of the protruding piece 52a. Specifically, the communication pipe 6b protruding rearward from the rear surface of the partition wall 51 is disposed between the axial center of the connection pipe 52 and the inner surface of the protruding piece 52a.

The front end of each of the communication pipes 6 is inserted forward from the rear end of the ink storage body 3 and is finally positioned near the rear end of the pen tip 2 inside the ink storage body 3. When the front ends of the communication pipes 6 are inserted into the ink storage body 3, the front ends of the communication pipes 6 press and compress the fibers of the ink storage body 3 forward. Thereby, the fiber density of the ink storage body 3 in the vicinity of the front end of each communication pipe 6 is set higher than the fiber density of the ink storage body 3 in a portion other than the vicinity of the front end of each communication pipe 6. That is, a high density portion 32 having a high fiber density (a high density portion 32 having a high capillary force) and a low density portion 33 having a low fiber density (a low density portion 33 having a low capillary force) are formed inside the ink occlusion body 3. The The high density portion 32 is formed in front of the ink occlusion body 3, and the low density portion 33 is formed in the rear of the high density portion 32. The high density part 32 and the low density part 33 are connected. Each of the communication pipes 6 penetrates the low density part 33 from the rear to the front, and the front end of each of the communication pipes 6 is positioned inside the high density part 32 ahead of the low density part 33.

In the present embodiment, the volume of the ink occlusion body 3 is V1, the volume of the insertion portion of the communication tube 6 into the ink occlusion body 3 is V2, and the insertion portion of the pen tip 2 into the ink occlusion body 3 is set. When the volume of is V3, the value of V2 / V1 is in the range of 0.03 to 0.1, and the value of (V2 + V3) / V1 is in the range of 0.05 to 0.15. In the present embodiment, the porosity (porosity) of the low density portion 33 is set to 85% to 93%, and the porosity of the high density portion 32 is lower than the porosity of the low density portion 33. The difference between the porosity of the low density portion 33 and the porosity of the high density portion 32 is set to 20%.

The front end of each of the communication pipes 6 is disposed at a position that is radially outward from the axis of the ink storage body 3. Specifically, the front ends of the communication pipes 6 are arranged at equal intervals on the same circumference centered on the axis of the ink storage body 3. In the present embodiment, since there are two communication pipes 6, the communication pipes 6 are arranged at 180 ° symmetrical positions with respect to the axis of the ink occlusion body 3. Since the nib 2 is located at the axial center of the ink occlusion body 3, the front end of each of the communication pipes 6 is not directly connected to the rear end of the nib 2 and is not in contact with the nib 2. The ink occluding body 3 is connected to the pen tip 2 through the inside front (high density portion 32) so that ink can be distributed. Further, the front end of each of the communication pipes 6 is located slightly behind the rear end of the pen tip 2.

Ink tank The ink tank 8 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 9 is stored directly in the ink tank 8. The ink 9 stored in the ink tank 8 may be either water-based ink or oil-based ink.

The outer surface of the connecting pipe 52 of the intermediate member 5 is detachably fitted to the inner surface of the front end opening of the ink tank 8. When ink 9 in the ink tank 8 is consumed and writing becomes impossible, the ink tank 8 is removed from the connection pipe 52, and the connection pipe 52 is installed in the front end opening of a new ink tank 8 filled with the ink 9. Insert it. Thereby, writing becomes possible again. A front end opening of the new ink tank 8 is closed by a plug 81. Specifically, a plug 81 is fitted on the inner surface of the front end opening of the ink tank 8. When the connecting pipe 52 is inserted into the front end opening of the ink tank 8, one side of the plug 81 is pressed backward by the protruding piece 52 a of the connecting pipe 52, the plug 81 is removed, and the front end opening of the ink tank 8 is removed. Is opened. Here, as the plug body 81, a disc-shaped plug body 81 made of a synthetic resin injection-molded body is employed. A spherical plug body may be employed instead of the disk-shaped plug body 81.

Cap The cap 12 is detachably provided on the pen tip 2 side. By attaching the cap 12 to the pen tip 2 side, the pen tip 2 and the front end opening of the air passage 11 are sealed, and communication between the ink tank 8 and the outside air is blocked.

In the present embodiment, at least one communication pipe 6b is protruded rearward from the rear surface of the partition wall 51, and the rear end of the communication pipe 6b is positioned inside the ink tank 8, so that the pen tip is suddenly lowered downward. When a pressure change occurs, the pressurized air in the ink tank 8 passes through the inside of the communication pipe 6b from the rear end opening of the communication pipe 6b protruding rearward from the rear surface of the partition wall 51, and then the ink. Through the inside of the occlusion body 3, it is quickly discharged to the outside, and there is no possibility that the ink leaks out or blows out from the pen tip 2 side. That is, the direct liquid writing instrument 1 of the present embodiment can prevent ink leakage and ink blowing from the pen tip 2 side even when the pressure in the ink tank 8 changes suddenly in a state where the pen tip faces downward.

In particular, when the pen tip is downward, the rear end of the communication pipe 6b protruding rearward is not located above the ink liquid level, but the rear of the communication pipe 6b protruding rearward from the ink liquid level. Since the distance to the end is shorter than the distance from the ink liquid surface to the rear surface of the partition wall 51 (that is, the distance between the rear end of the communication pipe 6a that does not protrude rearward from the rear surface of the partition wall 51 and the ink liquid surface), When the pressure in the ink tank 8 suddenly changes, a large amount of ink in the ink tank 8 is not pushed out to the ink occluding body 3 and passes through the respective communication pipes 6 and a little excess ink from the ink tank 8. Is pushed out by the ink occlusion body 3 and is held by the ink occlusion body 3, and immediately, the rear end opening of the communication pipe 6b protruding rearward and the space above the ink liquid surface communicate with each other. Pressurized air above the surface It is discharged to the outside through the communicating pipe 6b which projects the rear. Thereby, even when a sudden pressure change occurs in the pen tip downward state, it is possible to sufficiently prevent ink leakage and ink blowing from the pen tip 2 side.

The case where the pressure in the ink tank 8 changes abruptly means that, for example, after the cap 12 is mounted on the pen tip 2 side in a low temperature environment, the air in the ink tank 8 is pressurized in a high temperature environment. When removing the cap 12 from the nib 2 side in the state where the cap 12 is attached, or after removing the cap 12 from the nib 2 side in a decompressed state such as in an airplane after the cap 12 is attached to the pen nib 2 side at 1 atmospheric pressure on the ground Is mentioned.

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 schematic diagram which shows the volume V1, the volume V2, and the volume V3 in the 1st Embodiment of this invention. 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. 4, (2) is an enlarged sectional view taken along line EE in FIG. 4, and (3) is an enlarged sectional view taken along line FF in FIG. It is a schematic diagram which shows the volume V1, the volume V2, and the volume V3 in the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the pen tip downward state of the 3rd Embodiment of this invention. (1) is an enlarged sectional view taken along line GG in FIG. 7, (2) is an enlarged sectional view taken along line HH in FIG. 7, and (3) is an enlarged sectional view taken along line II in FIG. (1) is the JJ line expanded sectional view of FIG. 7, (2) is the KK line expanded sectional view of FIG. It is a schematic diagram which shows the volume V1, the volume V2, and the volume V3 in the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Direct liquid type writing instrument 2 Pen tip 3 Ink occlusion body 31 Outer skin 32 High density part 33 Low density part 4 Shaft cylinder 41 Tip part 42 Main body part 43 Rib 43a Restriction wall part 43b Cylindrical wall part 5 Intermediate member 51 Partition 51a Plate shape Rib 52 Connection pipe 52a Protruding piece 53 Mounting tube portion 6 Communication pipe 61 Flow path 6a Communication pipe 6b Communication pipe 7 Tail plug 8 Ink tank 81 Plug body 9 Ink 10 Clearance 11 Air path 12 Cap

Claims (4)

A pen tip, an ink occlusion body into which the rear end of the pen nib is inserted, an ink tank which is disposed behind the ink occlusion body and directly stores ink, and between the ink tank and the ink occlusion body A plurality of communication pipes connected to each other, and the inside of the ink storage body is pressed and compressed by inserting the front end of each communication pipe forward from the rear end of the ink storage body, and each of the communication pipes A direct liquid writing instrument with the front end positioned inside the ink occlusion body,
When the volume of the ink occlusion body is V1, and the volume of the insertion portion of the communication tube into the ink occlusion body is V2,
A direct liquid writing instrument, wherein the value of V2 / V1 is in the range of 0.02 to 0.3. A pen tip, an ink occlusion body into which the rear end of the pen nib is inserted, an ink tank which is disposed behind the ink occlusion body and directly stores ink, and between the ink tank and the ink occlusion body A plurality of communication pipes connected to each other, and the inside of the ink storage body is pressed and compressed by inserting the front end of each communication pipe forward from the rear end of the ink storage body, and each of the communication pipes A direct liquid writing instrument with the front end positioned inside the ink occlusion body,
When the volume of the ink occlusion body is V1, the volume of the insertion portion of the communication tube into the ink occlusion body is V2, and the volume of the insertion portion of the pen tip into the ink occlusion body is V3,
A direct liquid type writing instrument having a value of (V2 + V3) / V1 in the range of 0.03 to 0.4. A pen tip, an ink occlusion body into which the rear end of the pen nib is inserted, an ink tank which is disposed behind the ink occlusion body and directly stores ink, and between the ink tank and the ink occlusion body A plurality of communication pipes connected to each other, and the inside of the ink storage body is pressed and compressed by inserting the front end of each communication pipe forward from the rear end of the ink storage body, and each of the communication pipes A direct liquid writing instrument with the front end positioned inside the ink occlusion body,
When the volume of the ink occlusion body is V1, the volume of the insertion portion of the communication tube into the ink occlusion body is V2, and the volume of the insertion portion of the pen tip into the ink occlusion body is V3,
A direct liquid writing instrument, wherein the value of V2 / V1 is in the range of 0.02 to 0.3, and the value of (V2 + V3) / V1 is in the range of 0.03 to 0.4. A plate which is provided with a partition wall between the ink storage body and the ink tank, projects each of the communication pipes forward from the front surface of the partition wall, and protrudes in the axial direction from the front surface of the partition wall to the rear end surface of the ink storage body. 4. A plate-shaped rib and a rear end surface of the ink storage member are in contact with each other in the axial direction when the ribs are formed and the insertion of the front ends of the respective communication tubes into the ink storage member is completed. The direct liquid type writing instrument according to any one of the above.

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