JP2019025891A - Applicator - Google Patents

Abstract

To provide an applicator which can further reliably prevent leakage of ink to the outside and can be stably used.SOLUTION: There is provided an applicator 1 having a barrel portion 2, a coating liquid occlusion body 4 accommodated in a housing space of the barrel portion 2, and a coating body 3, in which an air flow passage 38 which communicates the housing space with the outside is formed. The air flow passage 38 has an opening portion facing the housing space, and at least a part of the opening portion is an opposing opening surface opposed to the coating liquid occlusion body 4. Then, the distance L1 between the coating liquid occlusion body 4 and the opposing opening surface is set to 1.5 mm or more and 6.0 mm or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an applicator for supplying a coating liquid impregnated in a coating liquid storage body to the coating body.

  Wide range of applicators, such as marking pens, that have an ink occlusion body (coating liquid occlusion body) impregnated with ink (coating liquid) built into the main body cylinder and supply ink from the ink occlusion body to the application body Are known. An example of such an applicator is disclosed in Patent Document 1.

  The writing instrument disclosed in Patent Document 1 has a structure in which a shaft cylinder and a pen tip holder for holding a pen body (applying body) are separately formed, and the pen tip holder is attached to the tip of the shaft cylinder. Specifically, a cylindrical protrusion is formed at the tip of the shaft tube, and the pen tip holder is attached to the shaft tube by inserting the pen tip holder into the protrusion.

Here, the nib holder is provided with a ventilation groove and is continuous with the hollow portion of the protrusion. On the other hand, a groove that communicates the hollow portion of the protruding portion and the space adjacent to the radially outer side of the outer peripheral surface of the protruding portion is provided at the end of the protruding portion on the ink storage member side.
That is, the writing instrument of Patent Document 1 is formed with a series of air passages that continue to the inner space of the shaft cylinder through the ventilation groove, the hollow portion of the protrusion, and the groove of the protrusion.

  Moreover, in the writing instrument of patent document 1, the coating liquid occlusion body is pressed to the front end side by the tail plug, and the front end side end face is pressed against the end face of the protruding portion. That is, the end surface of the coating liquid storage body is in contact with the portion where the groove portion is formed in the protruding portion.

  Further, in this writing instrument, a space partitioned by ribs is formed at a position adjacent to the outside in the radial direction of the protrusion, and the structure is configured to accommodate the ejected ink. In other words, by accommodating the ejected ink, the ink is prevented from leaking out.

Japanese Utility Model Publication No. 56-31411

However, the above-mentioned writing instrument of Patent Document 1 has room for further improvement from the viewpoint of preventing leakage of ink to the outside of the writing instrument and poor writing.
That is, the writing instrument of Patent Document 1 is formed in the projecting portion without the ink leaking from the coating solution storing body flowing into the space separated by the ribs because the coating solution storing body is pressed against the projecting portion. There was a problem that the air channel entered from the groove.
That is, there is a problem that ink flows out to the outside through the air flow path, or that the air flow path is blocked with the ink and a writing defect occurs.

Furthermore, in the writing instrument of Patent Document 1, since the space for storing ink is partitioned by ribs, a large amount of ink flows into any one space, and the ink overflows from this one space. In some cases, the ink leaks out as it is.
That is, since the ink is stored in a small space partitioned by the ribs, there is a problem that the amount of ink that can be stored inevitably (the amount of storage that can prevent leakage) is reduced.

  As a method for solving this problem, for example, a method of widening the space for storing ink without forming ribs is conceivable, but this is not preferable because the strength of the writing instrument is lowered and it is easily broken.

  Then, this invention makes it a subject to provide the applicator which can prevent the ink leakage to the exterior more reliably and can be used stably.

In order to solve such a problem, the present inventor has made various types of applicators as prototypes, and as a result, the coating liquid is less likely to leak by separating the portion connected to the air flow path and the coating liquid storage body more than a certain distance. There was found. That is, it has been found that ink cannot be prevented from flowing into the air flow path in a minute gap, and it becomes difficult for the ink to flow into the air flow path by ensuring a certain distance (1.5 mm or greater).
However, if the distance between the portion connected to the air flow path and the coating liquid storage body is too large, the coating liquid storage body becomes too short, and the amount of ink stored in the applicator decreases. . In this case, it is necessary to frequently replace the coating liquid storage body or to replace the applicator, which may give the user the impression that the applicator is quickly out of ink. Therefore, as a result of repeating the sensory test for various people by the present inventors, when the distance between the portion connected to the air flow path and the coating liquid storage body exceeds a certain length (6.0 mm), many It turns out that a person feels that the applicator is out of ink.

  The invention according to claim 1, which is provided based on such knowledge, includes a shaft tube portion, a coating liquid storage body accommodated in the shaft tube portion, and an application body for applying the coating solution. An applicator for supplying an application liquid impregnated in the application liquid storage body to the application body, wherein the shaft tube portion has an accommodation space for accommodating the application liquid occlusion body, and the accommodation space and the outside are arranged. A communicating air flow passage is formed, and the air flow passage has an opening portion facing the housing space, and at least a part of the opening portion includes the coating liquid storage body and the shaft tube portion. When the portion facing the coating liquid storage body in the opening portion is a counter opening surface, the coating liquid storage body and the coating liquid storage body The distance between the opposed opening surfaces is 1.5 mm or more and 6.0 mm or less. It is an application tool for the butterflies.

  According to the applicator of the present invention, ink leakage can be prevented more reliably, and the amount of ink stored in the coating solution storage body can be made sufficient.

  According to a second aspect of the present invention, the shaft tube portion has a main body tube portion and an inner small tube portion, the housing space is formed inside the main body tube portion, and at least a part of the inner small tube portion. Is located inside the accommodation space, the application body is held on the front end side of the shaft tube portion, a part is located inside the inner small tube portion, and a part on the rear side is Projecting from the inside of the inner small tube portion to the coating liquid storage body, the rear end side portion is in contact with the coating liquid storage body, and the air flow passage is formed from the outside of the shaft tube portion to the inner small tube portion. It is formed so as to be continuous with the accommodating space through the internal space of the cylindrical portion, and a part thereof is a gap portion formed between the inner small tubular portion and the application body, and the inner small tubular portion The applicator according to claim 1, wherein the counter opening surface is located at a rear end portion of the applicator.

  The applicator of the present invention is preferable because it can prevent ink leakage more reliably even when an air flow passage is formed in a narrow gap portion formed between the applicator and the inner small cylinder portion.

  According to a third aspect of the present invention, the main body cylinder part is formed with a protruding part, and the protruding part is on the outer side in the direction in which the transverse section of the shaft cylinder part spreads more than the inner small cylinder part. The rear end surface of the protruding portion is located on the same plane as the rear end surface of the inner small tube portion, or is located behind the rear end surface of the inner small tube portion. It is a thing, and is located ahead of the said application liquid storage body, and exists in the position which overlaps with the said application liquid storage body in the longitudinal direction of the said axial cylinder part, The Claim 2 characterized by the above-mentioned. It is an applicator.

  According to such a configuration, even if the coating liquid storage body is displaced to the coating body side (front side) for some reason, the coating liquid storage body abuts on the rear end surface of the inner small tube portion or the rear end surface of the protruding portion. Thus, the forward movement of the coating solution storage body is prevented. That is, it is possible to prevent a large shift of the coating liquid storage body, and it is possible to prevent the rear end portion of the inner small tube portion from entering deeply into the coating liquid storage body, thereby making it more difficult to block the air flow passage. it can.

  According to a fourth aspect of the present invention, the application body is held on the front end side of the shaft tube portion, and the position inside the shaft tube portion is on the front side of the application liquid storage body. The coating liquid storage part capable of storing the coating liquid is formed, and the coating liquid storage part has a plurality of small storage spaces partitioned by a partition wall part, and the partition wall part is formed from a rear end side. A liquid circulation hole is formed in part, and the liquid circulation hole communicates with two adjacent small storage spaces, and each of the small storage spaces individually has a predetermined amount of the coating liquid. Can be stored, and when the predetermined amount or more of the coating liquid flows into the one small storage space, the one small storage space is compared with the other small storage space adjacent to the one small storage space. 4. The coating liquid as claimed in claim 1, wherein the coating liquid flows in through the liquid circulation hole. Is an applicator of crab described.

In such a configuration, the liquid flow hole is formed in the partition wall portion located between the two small storage spaces, and when a large amount of ink (coating liquid) flows into the one small storage space, Ink flows from the storage space to another adjacent small storage space.
That is, when the amount of ink flowing into one small storage space is small, the coating liquid is stored in one small storage space, and when the amount is large, ink is stored in a plurality of small storage spaces. Yes. For this reason, even when a large amount of coating liquid flows in, ink can be stored while maintaining a state in which leakage of ink can be reliably prevented.

  According to a fifth aspect of the present invention, the shaft tube portion has a main body tube portion and an inner small tube portion, and inside the main body tube portion, an inner peripheral surface of the main body tube portion and the inner small tube portion. An outer peripheral surface is spaced apart in the direction in which the transverse cross section of the shaft tube portion spreads, and the coating liquid reservoir is formed between the inner peripheral surface of the main body tube portion and the outer peripheral surface of the inner small tube portion, 5. The applicator according to claim 4, wherein at least a part on the front end side of the partition wall portion is continuous with each of an inner peripheral surface of the main body cylinder portion and an outer peripheral surface of the inner small cylinder portion. is there.

  According to such a configuration, the partition wall portion functions as a rib integrated with both the inner peripheral surface of the main body cylinder portion and the outer peripheral surface of the inner small cylinder portion, so that the strength of the applicator can be further improved.

  The invention according to claim 6 has a dividing wall portion that divides a space formed between an inner peripheral surface of the main body cylindrical portion and an outer peripheral surface of the inner small cylindrical portion in the front-rear direction, and The wall portion closes the front side of the small storage space to form a bottom portion, and the main body tubular portion, the inner small tubular portion, the partition wall portion, and the dividing wall portion are integrally formed. The applicator according to claim 5, wherein the applicator is provided.

  According to such a configuration, it is possible to make it difficult for ink leakage to occur by integrally forming the main body cylinder part, the inner small cylinder part, the partition wall part, and the dividing wall part, and the manufacture of the applicator is relatively easy. It can be simplified.

The invention according to claim 7 includes a shaft tube portion, a coating liquid storage body accommodated in the shaft tube portion, and an application body for applying the coating liquid, and impregnating the coating liquid storage body. An applicator for supplying the applied liquid to the applied body, wherein the applied liquid occlusion body is formed by accommodating a fiber converging body inside a cylindrical outer member, An accommodation space for accommodating the coating liquid storage body, an air flow passage communicating with the accommodation space and the outside is formed, and the air flow passage has an opening portion facing the accommodation space; At least a part of the opening portion is formed at a position overlapping the coating liquid storage body in the longitudinal direction of the shaft cylinder portion, and is opposed to the coating liquid storage body. The coating liquid occlusion body and the facing opening surface when the portion facing the body is the facing opening surface Distance and X1, when the diameter of the coating liquid absorbing body was X2, a applicator, characterized in that to satisfy the relationship of formula (1).
1.5 × (X2 / 6.1) ≦ X1 ≦ 6.0 × (X2 / 6.1) (1)

  Also in this applicator, ink leakage can be prevented more reliably, and the amount of ink stored in the coating solution storage body can be made sufficient.

  In the invention according to claim 8, the shaft tube portion has a main body tube portion and an inner small tube portion, and the application body is partially located inside the inner tube portion, The air flow passage is formed so as to be continuous with the housing space from the outside of the shaft tube portion through the inner space of the inner tube portion, and a part of the air flow passage is formed between the inner tube portion and the application body. The applicator according to claim 1, wherein the applicator is a gap portion to be formed, and a radial length of the shaft cylinder portion of the gap portion is greater than 0.04 mm and equal to or less than 0.5 mm. .

  According to such a configuration, ink leakage can be more reliably prevented even when the air flow passage is formed in a narrow gap formed between the application body and the inner small cylinder portion.

  The above-described invention has a dividing wall portion that divides a space formed between the inner peripheral surface of the main body cylindrical portion and the outer peripheral surface of the inner small cylindrical portion in the front-rear direction, and the dividing wall portion is It is preferable to close the front side of the accommodation space (claim 9).

  According to a tenth aspect of the present invention, a coating liquid storage section capable of storing the coating liquid is formed in the shaft cylinder portion at a position on the front side of the coating liquid storage body. The portion has a plurality of small storage spaces partitioned by a partition wall portion, and the dividing wall portion closes a front side of the small storage space to form a bottom portion, and the main body cylinder portion and The applicator according to claim 9, wherein the inner small tube portion, the partition wall portion, and the dividing wall portion are integrally formed.

  In such a configuration, the leaked ink can be stored in the small storage space, and ink leakage can be prevented more reliably.

In the above-described invention, the inner hole of the inner small cylinder part is a hole having a substantially circular cross-sectional shape, and the application body has an in-cylinder arrangement part located inside the inner small cylinder part. The cross-sectional shape of the in-cylinder arrangement portion is preferably a shape that is substantially circular (claim 11).
The “substantially circular” as used herein refers to a substantially circular shape, including a case where the outer peripheral portion has fine irregularities that can be substantially ignored. Moreover, the description of "abbreviation" in the following is also the same, and includes what has a slight protrusion and a dent (missing part) in an edge part.

  The invention which concerns on Claim 12 has a shaft cylinder part, the coating liquid occlusion body accommodated in the said shaft cylinder part, and the application body for apply | coating a coating liquid, and was made to impregnate the said coating liquid occlusion body An applicator for supplying an application liquid to the application body, wherein the shaft cylinder part has a main body cylinder part and an inner small cylinder part, and has an accommodating space for accommodating the application liquid storage body inside. And an air flow passage communicating with the housing space and the outside is formed, and the application body is partially located inside the inner small tube portion, and the air flow passage is formed on the shaft. Formed from the outside of the cylinder part through the internal space of the inner small cylinder part to be connected to the accommodation space, and a part thereof becomes a gap part formed between the inner small cylinder part and the application body. And the radial length of the shaft cylinder portion of the gap portion is greater than 0.04 mm and 0.5 mm or less. A applicator characterized by and.

The invention according to claim 13 includes a shaft tube portion, a coating solution storage body accommodated in the shaft tube portion, and a coating body for applying the coating solution, and the coating solution storage body is impregnated. An applicator for supplying an application liquid to the application body, wherein the shaft cylinder part has a main body cylinder part and an inner small cylinder part, and has an accommodating space for accommodating the application liquid storage body inside. An inner hole of the inner small tube portion is a hole having a substantially circular cross-sectional shape, and the application body has an in-cylinder arrangement portion located inside the inner small tube portion, The cross-sectional shape of the arrangement portion is substantially circular, and an air flow passage that communicates the housing space with the outside is formed, and the air flow passage is formed from the outside of the shaft tube portion to the inner small tube portion. An internal space is formed so as to be continuous with the accommodating space, and a part of the internal space is formed between the inner small tube portion and the in-cylinder arrangement portion. Has become a gap portion to be,
The applicator is characterized in that a difference between an inner hole diameter of the inner small cylinder portion and a cross-sectional diameter of the in-cylinder arrangement portion is greater than 0.08 mm and equal to or less than 1 mm.

  The invention which concerns on Claim 14 has an axial cylinder part, the coating liquid occlusion body accommodated in the said axial cylinder part, and the application body for apply | coating a coating liquid, and was made to impregnate the said coating liquid occlusion body An applicator for supplying an application liquid to the application body, wherein the shaft cylinder part has a main body cylinder part and an inner small cylinder part, and has an accommodating space for accommodating the application liquid storage body inside. The applicator has an in-cylinder arrangement portion located inside the inner small cylinder portion, and an air flow passage communicating with the housing space and the outside is formed. A gap formed between the outside of the shaft tube portion and the housing space through the internal space of the inside small tube portion, a part of which is formed between the in-cylinder arrangement portion and the in-cylinder arrangement portion A minimum inclusion circle that is a portion and can include the cross-sectional shape of the inner hole of the inner small cylinder portion is a first minimum inclusion circle The difference between the diameter length of the first minimum inclusion circle and the diameter length of the second minimum inclusion circle when the minimum inclusion circle that can include the cross-sectional shape of the in-cylinder arrangement portion is the second minimum inclusion circle Is an applicator characterized by being larger than 0.08 mm and not larger than 1 mm.

  These applicators can also more reliably prevent ink leakage even when an air flow passage is formed in a narrow gap formed between the applicator and the inner small cylinder portion.

  The invention relating to the present invention described above has a shaft tube portion, a coating liquid storage body accommodated in the shaft tube portion, and a coating body for applying the coating liquid, and the coating liquid storage body is impregnated. An applicator for supplying a coating liquid to the coating body positioned on the front end side, wherein the coating liquid can be stored in a position on the front side of the coating liquid storage body inside the shaft tube portion. A liquid storage part is formed, the coating liquid storage part has a plurality of small storage spaces partitioned by a partition wall part, and the partition wall part has a liquid circulation hole part in a part from the rear end side. The liquid circulation hole portion communicates with the two adjacent small storage spaces, and each of the small storage spaces can individually store a predetermined amount of the coating liquid, Adjacent to one small storage space by flowing a predetermined amount or more of the coating liquid into the small storage space Respect of the small storage space, a applicator, characterized in that the coating liquid flows from one said small storage space through the liquid circulation holes.

  Also in this applicator, ink can be stored while maintaining a state in which leakage of ink can be reliably prevented even when a large amount of coating liquid flows.

  The present invention can provide an applicator that can more reliably prevent ink leakage to the outside.

It is sectional drawing which shows the applicator which concerns on embodiment of this invention, and expands and shows a part. It is sectional drawing which shows the front-end side part of the axial cylinder part of FIG. It is a perspective view which shows the front-end side part of the axial cylinder part of FIG. It is a cross-sectional perspective view which shows the front-end side part of the axial cylinder part of FIG. It is a partially broken perspective view which shows the front end side part of the axial cylinder part of FIG. It is AA sectional drawing which shows the axial cylinder part of FIG. It is explanatory drawing which shows typically the ink storage part of the applicator of FIG. It is explanatory drawing which shows a mode that ink flows in into the ink storage part of the applicator of FIG. 1, and flows in order of (a)-(c). It is sectional drawing which shows the applicator of embodiment different from FIG. 1, and one part is expanded and shown. It is a figure which shows the front-end side part of the axial cylinder part in the applicator of FIG. 9, (a) is sectional drawing, (b) is a partially broken perspective view. It is explanatory drawing which expands and shows a part of applicator of FIG. 1, and expands and shows a part further. It is a figure which shows the applicator which concerns on embodiment different from each above-mentioned embodiment, Comprising: (a) is explanatory drawing which shows typically an inner cylinder part periphery, (b) is a cross section which shows an inner cylinder part periphery It is a figure, (c) is explanatory drawing which expands and shows a part of (b). It is a figure which shows the applicator which concerns on embodiment different from each above-mentioned embodiment, Comprising: (a) is explanatory drawing which shows typically an inner cylinder part periphery, (b) is a cross section which shows an inner cylinder part periphery It is a figure, (c) is explanatory drawing which expands and shows a part of (b). 6 is a graph showing the results of Experiment 1.

  Further embodiments of the present invention will be described below. In the following description, unless otherwise specified, the “front-rear” relationship will be described with the pen tip side that is one end side in the longitudinal direction as the front side and the other end side as a pair as the rear side.

As shown in FIG. 1, the applicator 1 according to the embodiment of the present invention includes a shaft tube portion 2, a pen tip member 3 (applying body), an ink storage body 4 (application liquid storage body), and a tail plug 5. It has a structure.
The applicator 1 has a structure in which an ink occlusion body 4 is built in the shaft cylinder portion 2, and a pen tip member 3 extending over the inside and outside of the shaft cylinder portion 2 comes into contact with the ink occlusion body 4. . The pen nib member 3 sucks ink (coating liquid) impregnated in the ink occlusion body 4 by capillary action, and the pen nib member 3 sucked in ink is brought into contact with an application object such as paper. Thus, the ink is applied.

The shaft tube portion 2 is a tubular member in which both end portions in the longitudinal direction are opened, and is a resin molded body formed using an appropriate resin as a raw material.
The shaft tube portion 2 has a main body tube portion 10 and a mounting tube portion 11 (inner small tube portion) for holding the pen tip member 3, which are integrated.

The main body cylinder portion 10 is a portion that occupies most of the shaft cylinder portion 2, and is a portion that has a substantially cylindrical shape and forms a pen shaft.
As shown in FIG. 1, the internal space (accommodating space) of the main body cylinder portion 10 is a space that can accommodate the ink occlusion body 4. And in the state which stored the ink occlusion body 4, the space | gap is formed between the internal peripheral surface of the main body cylinder part 10, and the ink occlusion body 4. FIG.

  The mounting cylinder portion 11 has a substantially cylindrical shape whose diameter is smaller than that of the main body cylinder portion 10, a part thereof is located inside the main body cylinder portion 10, and another part is the front end side of the main body cylinder portion 10. It is a part which protrudes outside from an opening part.

  The part located in the inside of the main body cylinder part 10 among the cylinder parts 11 for attachment is distribute | arranged to the position away from the internal peripheral surface of the main body cylinder part 10 over the perimeter of the circumferential direction. And the connection board part 15 (partition wall part) is formed so that a part of outer peripheral surface of the cylinder part 11 for attachment and a part of inner peripheral surface of the main body cylinder part 10 may be connected.

As shown in FIG. 3, the connecting plate portion 15 extends along the circumferential direction of the main body cylinder portion 10 and the attachment cylinder portion 11, and is a plate-like portion that is continuous in an annular shape.
That is, as shown in FIG. 2, the space located between the inner peripheral surface of the main body cylindrical portion 10 and the outer peripheral surface of the mounting cylindrical portion 11 is divided by the connecting plate portion 15 in the longitudinal direction of the shaft cylindrical portion 2. ing.

  The mounting cylinder part 11 is roughly divided into a front cylinder part 11a that is a part from the part where the connecting plate part 15 is located to the front end, and an inner cylinder part 11b that is located on the rear side of the rear end surface of the connecting plate part 15; It becomes the cylindrical part divided into.

The front cylinder part 11a has a larger inner diameter than the inner cylinder part 11b. And in the rear end side part of this front side cylinder part 11a, the diameter becomes narrow as the diameter of an inner hole goes back.
For this reason, a gentle step is formed between most of the inner hole of the front cylinder part 11a and the inner hole of the inner cylinder part 11b. That is, inside the mounting cylinder 11, a portion having a relatively large diameter located on the front end side and a portion having a relatively small diameter located on the rear end side are continuous through a gentle step.

  Here, a communication groove 17 is formed on the inner peripheral surface of the mounting cylinder portion 11. As shown in FIG. 3, the communication grooves 17 are formed in a plurality (six in this embodiment), and are rotationally symmetric in plan view (plan view in which the line-of-sight direction is the longitudinal direction of the axial tube portion 2). It is formed at each position. Of these communication grooves 17, two communication grooves 17 are continuous with the front end side missing portion 18.

The front end side missing part 18 is a part in which a part of the front end part of the front side cylinder part 11a is missing. That is, it is a portion that is recessed rearward from the front end of the front cylindrical portion 11a, and a portion that penetrates the side wall surface of the front cylindrical portion 11a.
In the present embodiment, the two front end side missing portions 18 are formed at positions separated from each other in the radial direction of the front side cylinder portion 11 a, and the inner side portion in the radial direction of the front side cylinder portion 11 a is the front end portion of the communication groove 17. Is continuous. These front end side missing portions 18 form a series of groove-like portions together with the communication groove 17.

  As shown in FIG. 4, the communication groove 17 is formed on the inner peripheral surface of the mounting cylinder portion 11, and is a groove-shaped portion that is recessed outward in the radial direction of the mounting cylinder portion 11 from the periphery. These communication grooves 17 extend along the longitudinal direction (front-rear direction) of the mounting cylinder part 11 between the front end of the front cylinder part 11a and a position slightly behind the front end of the inner cylinder part 11b. .

The inner cylinder portion 11b has a missing portion 20 formed at the rear end portion thereof.
The missing part 20 is a part formed by missing a part of the rear end part of the inner cylinder part 11b, extends forward from the rear end of the inner cylinder part 11b, and has a side wall surface of the inner cylinder part 11b. It is the part that penetrates. In other words, the missing part 20 penetrates from the outer peripheral surface to the inner peripheral surface of the inner cylinder part 11b, and communicates the space adjacent to the radially outer side of the inner cylinder part 11b and the inner space of the inner cylinder part 11b. .

As shown in FIG. 5, a plurality (four in this embodiment) of the missing portions 20 are formed, and each of the missing portions 20 is arranged in parallel with a gap in the circumferential direction of the inner cylinder portion 11 b. More specifically, the two missing portions 20 are respectively formed at positions that face each other in the radial direction of the shaft tube portion 2. The other two missing portions 20 are formed in the radial direction of the shaft tube portion 2 and at positions facing each other in a direction perpendicular to the opposing direction of the two missing portions 20 described above.
That is, the plurality of missing portions 20 are formed so as to be rotationally symmetric in plan view (plan view in which the line-of-sight direction is the longitudinal direction of the axial tube portion 2).

Here, a first rib portion 23 (see FIG. 2 and the like) is formed in the internal space of the main body cylinder portion 10.
Furthermore, in the internal space of the main body cylinder part 10, an ink storage part 25 (coating liquid storage part) for storing ink leaking from the ink occlusion body 4 in order to prevent leakage of ink to the outside of the shaft cylinder part 2. Is formed.

The first rib portion 23 functions as a reinforcing rib for improving the strength of the main body cylinder portion 10 and also functions as a guide for arranging the ink occlusion body 4 at a specified position.
As shown in FIGS. 2 and 4, the first rib portion 23 is a protruding portion that is formed integrally with the inner peripheral surface of the main body cylinder portion 10 and projects radially inward from the inner peripheral surface.
Of the protruding end surface of the first rib portion 23, an inclined surface is formed on the portion located on the rear end side, as shown in FIG. 4, toward the radially outer side of the main body cylinder portion 10 toward the rear end side. ing. In other words, the rear end portion of the first rib portion 23 is formed so that the protruding length becomes shorter toward the rear end side.
That is, most of the front end side of the first rib portion 23 has a quadrangular cross-sectional shape that extends in the longitudinal direction of the main body cylinder portion 10. And a part of the rear end side extends so that the cross-sectional area becomes smaller toward the rear end side.

A plurality of the first rib portions 23 are provided, and are arranged so as to be arranged in parallel at intervals in the circumferential direction of the main body cylinder portion 10.
Here, the case where the tail plug 5 is removed from the main body cylinder portion 10 and the ink storage body 4 is inserted from the rear side and moved to the front side will be described. At this time, if the ink occlusion body 4 is displaced from the specified position to the outside in the radial direction of the main body cylinder portion 10, the front side of the ink occlusion body 4 is moved by moving the ink occlusion body 4 forward. The portion comes into contact with the inclined surface on the rear end side of the first rib portion 23. In this state, by pushing the ink occlusion body 4 forward, the front end side portion of the ink occlusion body 4 moves to the radial center side of the main body cylinder portion 10 along the inclined surface. As described above, the first rib portion 23 functions as an introduction guide for the ink occlusion body 4, thereby preventing the displacement of the ink occlusion body 4 accommodated in the main body cylinder portion 10.

The ink storage unit 25 is configured by a plurality of storage units (small storage spaces) including the first storage unit 25a to the fourth storage unit 25d. Each of the storage portions includes an integrally formed inner peripheral surface of the main body cylindrical portion 10, an outer peripheral surface of the inner cylindrical portion 11b, a rear end surface of the connecting plate portion 15, and a partition wall portion 30 (a partition wall portion and a protrusion). It is a space surrounded by
That is, the ink storage part 25 is a space adjacent to the outer side in the radial direction of the inner cylinder part 11 b, and a space continuous in the circumferential direction of the inner cylinder part 11 b is divided into a plurality (four) by the partition wall part 30. Is formed.

  The partition wall portion 30 is a protruding portion that is formed integrally with the inner peripheral surface of the main body cylinder portion 10 and the rear end surface of the connecting plate portion 15 and extends rearward from the rear end surface of the connecting plate portion 15.

  The partition wall 30 is a portion that has a substantially “convex” cross-sectional shape and extends in the longitudinal direction (depth direction in FIG. 6) of the main body cylinder 10. In the present embodiment, a plurality of (four) partition wall portions 30 are formed at rotationally symmetric positions in plan view (plan view in which the line-of-sight direction is the longitudinal direction of the shaft tube portion 2).

  That is, the partition wall portion 30 includes a base end side portion 30a located on the inner peripheral surface side of the main body cylinder portion 10 and a front end side portion 30b located on the radially inner side of the main body cylinder portion 10 with respect to the base end side portion 30a. And is a projecting portion formed integrally. Then, in the portion adjacent to the inner cylinder portion 11b in the front end side portion 30b, as shown in FIG. 5, the liquid communication groove portion 31 extends from the rear end to the front side (extends from the upper end to the lower side in FIG. 5). (Liquid circulation hole) is formed.

The base end side portion 30a is a portion having a substantially square cross-sectional shape and extending in the longitudinal direction of the main body cylinder portion 10 (depth direction in FIG. 6).
The distal end side portion 30b is a portion that further protrudes from the protruding end of the proximal end side portion 30a (the inner end portion in the radial direction of the main body cylindrical portion 10). The cross-sectional shape is a quadrangular shape and extends in the longitudinal direction (depth direction in FIG. 6) of the main body cylinder portion 10, and the length in the width direction is shorter than the base end side portion 30a.
Here, the “length in the width direction” is a length in a direction orthogonal to the front-rear direction (extending direction of the main body cylinder portion 10) and the protruding direction of the distal end side portion 30b. That is, it is the distance between two side wall surfaces that are separated in a direction orthogonal to the radial direction of the main body cylinder portion 10.

  Therefore, in each of the both side wall surfaces of the partition wall part 30, the level | step difference is formed in the boundary part of the base end side part 30a and the front end side part 30b.

Furthermore, as shown in FIG. 5, the front end side portion 30 b is in a state where a part of the rear end side (upper end side in FIG. 5) is located outside the missing portion 20.
The “outside of the missing portion 20” here is the outside in the radial direction of the inner cylinder portion 11b. In other words, the cross section of the inner cylinder portion 11b (the main body cylinder portion 10, the mounting cylinder portion 11). It is the outside in the spreading direction. And the length of the missing part 20 in the circumferential direction of the inner cylinder part 11b is longer than the length in the same direction of the front end side part 30b located on the outer side.

  Here, as described above, the liquid communication groove portion 31 is formed in the portion adjacent to the inner cylinder portion 11 b of the partition wall portion 30. The liquid communication groove portion 31 is a groove-like portion that forms a substantially rectangular parallelepiped space, and penetrates the partition wall portion 30 in the width direction (thickness direction). In other words, the partition wall 30 extends from one side to the other of both side wall surfaces.

The liquid communication groove 31 extends forward from the rear end of the partition wall 30 (downward from the upper end in FIG. 5) and extends to a position slightly rearward of the center in the front-rear direction.
For this reason, most of the portion excluding a part of the rear end side of the front end side portion 30b is integrated continuously with the side wall surface of the inner cylinder portion 11b. That is, the front end side portion of the partition wall portion 30 is continuous with the inner peripheral surface of the main body cylindrical portion 10, the outer peripheral surface of the inner cylindrical portion 11b, and the rear end surface of the connecting plate portion 15, and straddles three surfaces. It is formed as follows.

In other words, the front side part (lower part in FIG. 5) of the partition wall part 30 extends between the inner peripheral surface of the main body cylinder part 10 and the outer peripheral surface of the inner cylinder part 11b, and connects them. From this, the space (storage part) located on both sides across the partition wall part 30 is in a state in which the front parts (the lower parts in FIG. 5) are separated.
On the other hand, in the rear part (upper part in FIG. 5) of the partition wall part 30, the inner peripheral surface of the main body cylinder part 10 and a position that is separated outward in the radial direction of the main body cylinder part 10 from the inner cylinder part 11b. Extending between. From this, the rear portions (the upper portions in FIG. 5) of the two spaces (reservoir portions) located on both sides of the partition wall portion 30 are in a state where most of them are separated. A part of is in communication.

Further, an auxiliary contact rib portion 33 (protruding portion) that is a second rib portion is formed in the internal space of the main body cylinder portion 10.
As shown in FIGS. 5 and 6, the auxiliary abutment rib portion 33 is also formed integrally with the inner peripheral surface of the main body cylinder portion 10 and the rear end surface of the connecting plate portion 15. It extends toward the rear side from the end face.

At this time, the auxiliary abutment rib portion 33 is a portion having a substantially square cross-sectional shape and extending in the longitudinal direction of the main body cylinder portion 10 (depth direction in FIG. 6). In the present embodiment, a plurality (four) of auxiliary contact ribs 33 are formed at positions that are rotationally symmetric in plan view (plan view in which the line-of-sight direction is the longitudinal direction of the axial tube portion 2).
And among the auxiliary | assistant contact rib part 33, the part located in the innermost part in the radial direction of the main body cylinder part 10 exists in the position away from the outer peripheral surface of the inner cylinder part 11b. That is, a space is formed between the auxiliary contact rib portion 33 and the outer peripheral surface of the inner cylinder portion 11b.

And the partition wall part 30 and the auxiliary | assistant contact rib part 33 are distribute | arranged so that each may mutually be parallel in the circumferential direction of the main body cylinder part 10, and the 1st rib part 23 is also as above mentioned. The main body cylinder portion 10 is arranged so as to be parallel to each other with a gap in the circumferential direction. The first rib portion 23 is disposed in a portion located between the partition wall portion 30 and the auxiliary contact rib portion 33 in the circumferential direction of the main body cylinder portion 10.
That is, in the circumferential direction of the main body cylinder portion 10, the intervals are arranged in the order of the partition wall portion 30, the first rib portion 23, the auxiliary contact rib portion 33, the first rib portion 23, the partition wall portion 30. It is parallel with a gap.

More specifically, the base end side portion 30a and the auxiliary contact rib portion 33 are arranged in parallel with an annular interval in the circumferential direction of the main body cylinder portion 10, and the inner side (the inner side in the radial direction of the main body cylinder portion 10). ), The distal end side portion 30b is arranged in parallel in the same direction (circumferential direction of the main body cylinder portion 10) with an annular interval.
The “inner side in the radial direction of the main body cylinder part 10” is also the inner side in the spreading direction of the cross section of the main body cylinder part 10.
Of the distal end side portions 30b, the two distal end side portions 30b are formed at positions separated from each other in the radial direction of the main body cylinder portion 10, and are orthogonal to the separating direction of the two distal end side portions 30b. The other two tip side portions 30b are formed at positions separated from each other.
That is, the separation direction of the two tip side portions 30b and the separation direction of the other two tip side portions 30b are both radial directions of the main body cylinder portion 10, and are orthogonal to each other.

  Here, the rear end surface of the inner cylinder portion 11b, the rear end surface of the partition wall portion 30, and the rear end surface of the auxiliary contact rib portion 33 are all on the same plane (a virtual plane orthogonal to the longitudinal direction of the main body cylinder portion 10). It is a surface located on the top. That is, the inner cylinder part 11b, the partition wall part 30, and the auxiliary contact rib part 33 are all formed so as to protrude rearward from the rear end surface of the connecting plate part 15, and have the same length in the front-rear direction. ing.

As shown in FIG. 1, the pen tip member 3 is a member that is partitioned into a pen tip forming portion 3a located on the front end side and a rear shaft portion 3b located on the rear end side. And most of the nib forming part 3a is a part having a larger diameter than the rear shaft part 3b.
The nib member 3 is formed of a material obtained by joining appropriate fiber bundles such as a heat-bonded processed body of fiber bundles, a processed resin body of fiber bundles, and a processed resin body of felt. And in the state attached to the axial cylinder part 2, the front-end side part of the pen point formation part 3a turns into a part exposed ahead rather than the front end of the front side cylinder part 11a. A part of the rear end side of the rear shaft portion 3b is located on the rear side with respect to the rear end of the inner cylinder portion 11b, and is inserted into the batting 36 (described later in detail) of the ink storage body 4. . That is, the rear side portion of the pen tip member 3 protrudes from the inner side of the inner cylinder portion 11 b to the rear side and is in contact with the ink occlusion body 4.

  As shown in FIG. 1, the ink occlusion body 4 is a member formed by filling the outer member 35 with a filling 36 impregnated with ink.

The outer member 35 is a resin-made member whose outer shape is cylindrical, and is made of an appropriate resin such as polyethylene resin or polypropylene resin.
The batting 36 is a fiber converging body impregnated with ink. Although not particularly limited, the cotton pad 36 includes synthetic fibers such as acrylic fiber, polyester fiber, nylon fiber, polyethylene fiber, and polypropylene fiber, plant fibers such as cotton, hemp, and pulp, animal fibers such as wool and raw silk, etc. Can be suitably employed.

  Here, although not particularly limited, the ink occlusion body 4 of the present embodiment is formed by heat-sealing the outer member 35 and the batting 36. That is, the inner peripheral surface of the outer member 35 and a part of the inner cotton pad 36 located on the radially outer side of the ink occlusion body 4 are heat-sealed.

Further, although not particularly limited, the diameter of the ink occlusion body 4 can be 3.0 mm or more and 20.0 mm or less, and preferably 6.0 mm or more and 15.0 mm or less. . More preferably, it is about 6.1 mm, and in this embodiment, it is set to 6.1 mm.
The “degree” here includes an error (tolerance) of several percent, and the same applies to the following description. Moreover, when the diameter of the ink occlusion body 4 is increased, other portions such as the shaft tube portion 2 may be appropriately increased accordingly.

  The tail plug 5 can be attached to the rear end side of the shaft cylinder portion 2 (main body cylinder portion 10), and is a member that closes an open portion located on the rear end side of the main body cylinder portion 10 by being attached.

Here, in the applicator 1 of the present embodiment, a series of air flow passages 38 communicating with the outside and the internal space are formed in the front end side portion.
Specifically, the pen tip member 3 is a member that is held by the shaft tube portion 2 when the rear portion of the pen tip forming portion 3a is fitted into the front tube portion 11a. At this time, inside the front cylinder part 11a, the part where the communication groove 17 (see FIG. 3) is not formed in the inner peripheral surface of the front cylinder part 11a and the outer peripheral surface of the pen tip forming part 3a are in close contact with each other. It has become.

  Further, as described above, a gap is formed between the inner peripheral surface of the inner cylindrical portion 11b and the outer peripheral surface of the rear shaft portion 3b inside the inner cylindrical portion 11b. That is, the front side portion of the rear shaft portion 3b is disposed at a position away from the inner peripheral surface of the inner cylinder portion 11b over the entire circumference in the circumferential direction. Thus, a space extending along the longitudinal direction of the inner cylinder portion 11b while being continuous in the circumferential direction of the inner cylinder portion 11b is formed between the rear shaft portion 3b and the inner cylinder portion 11b.

Here, as described above, the front end side missing portion 18 (see FIG. 3) forms a series of groove-like portions continuously with some of the communication grooves 17.
Therefore, the air flow passage 38 includes a series of groove-shaped portions formed by the front end side missing portion 18 and the communication groove 17, a groove-shaped portion formed by the communication groove 17, and a gap inside the inner cylinder portion 11 b. It is a series of flow paths formed continuously.

  As described above, in the applicator 1 of the present embodiment, the air flow passage 38 extending along the longitudinal direction of the pen tip member 3 is formed between the pen tip member 3 and the mounting cylinder portion 11 that holds the pen tip member 3. Has been. The air flow passage 38 is continuous with the rear end portion of the inner cylinder portion 11 b and the internal space of the main body cylinder portion 10 via the missing portion 20.

That is, the air flow passage 38 extends from the vicinity of the front end of the mounting cylinder portion 11 to the internal space of the main body cylinder portion 10, and the internal space of the main body cylinder portion 10 through the opening surface located at the boundary portion with the internal space. Is continuous.
That is, as shown in FIG. 6, as such an opening surface, a rear end side opening surface 38a (opening portion, opposed opening surface) located at the rear end portion of the inner cylinder portion 11b and the outer periphery of the inner cylinder portion 11b. A side opening surface 38 b (opening portion) formed on the surface is located at the flow path end of the air flow passage 38.

The rear end side opening surface 38a is a position that is flush with the rear end surface of the inner cylinder portion 11b, and is formed at a position adjacent to the outside of the pen tip member 3 in the spreading direction of the cross section of the inner cylinder portion 11b. It becomes the made opening surface.
The side opening surface 38b is an opening surface located at a boundary portion between the inner space of the missing portion 20 and the main body cylinder portion 10, and the outer end portion of the missing portion 20 in the spreading direction of the cross section of the inner cylinder portion 11b. It is a part located in.
That is, the air flow passage 38 is continuous with the internal space of the main body cylinder portion 10 at a plurality of locations, and has a plurality of openings facing the internal space of the main body cylinder portion 10.

  Here, the applicator 1 of the present embodiment has the ink occlusion body at a position away from the opening surface (rear end side opening surface 38a) of the air flow passage 38 located at the rear end portion of the inner cylinder portion 11b to the rear side. The front end portion of 4 (filling 36) is positioned. In other words, the opening surface of the air flow passage 38 is formed at a position where it overlaps with the batting 36 of the ink occlusion body 4 in the longitudinal direction of the shaft tube portion 2, and these are in a state of facing each other.

Therefore, a space is formed between the opening surface of the air flow passage 38 located at the rear end portion of the inner cylinder portion 11 b and the ink occlusion body 4. And it is the length of the front-back direction of this space, and the distance L1 from the opening surface of the air flow path 38 to the ink occlusion body 4 is 1.5 mm or more and 6.0 mm or less.
This distance L1 is more preferably 1.8 mm or greater and 4.0 mm or less, and even more preferably 2.0 mm or greater and 2.5 mm or less. In this embodiment, the distance L1 is about 2.0 mm.

  In this way, by arranging the ink occlusion body 4 at a position sufficiently away from the opening surface of the air flow passage 38, the opening surface of the air flow passage 38 is disposed at a position where it overlaps the longitudinal direction of the batting 36 and the shaft tube portion 2. Even so, the inflow of ink can be further suppressed.

Further, as described above, the rear end surface of the inner cylinder portion 11b, the rear end surface of the partition wall portion 30, and the rear end surface of the auxiliary abutment rib portion 33 are all located on the same plane. It is located in front of the occlusion body 4 (filling 36). In other words, each of these surfaces is disposed at a position where it overlaps the batting 36 in the longitudinal direction of the shaft tube portion 2 and at a position ahead of the batting 36.
For this reason, even if the batting 36 is displaced forward due to an impact at the time of dropping or the like, these contact with a wide area of the batting 36, so that the batting 36 is prevented from moving further forward. (Or suppression). From this, the rear end side portion of the inner cylinder portion 11b, that is, the portion where the missing portion 20 is formed does not become a state embedded in the batting 36, and the air flow passage 38 is blocked. It can be stopped more reliably.

Further, as described above, the applicator 1 of the present embodiment has the ink reservoir 25 formed at a position adjacent to the inner cylinder portion 11b (see FIG. 7 and the like).
And while each of the four storage parts (1st storage part 25a thru | or 4th storage part 25d) which comprise the ink storage part 25 can each store an ink individually, it is biased to one storage part and a large amount of ink is stored. When the ink flows in, the ink is stored together with the adjacent storage portion.

  That is, as shown in FIG. 8, when the ink flows into any one of the reservoirs (the first reservoir 25a in FIG. 8), the amount of ink stored in the one reservoir increases. Go. When the ink stored in one storage part reaches the liquid communication groove part 31, the ink is transferred from the liquid communication groove part 31 to the other storage parts (second storage part 25b and fourth storage part 25d in FIG. 8). Inflow.

Here, as shown in FIG. 7, the liquid communication groove portion 31 extends forward (downward from the upper end of FIG. 7) from the rear end of the partition wall portion 30, and the front end portion of the liquid communication groove portion 31 is the missing portion 20. It is arranged at a position farther forward than the front end.
That is, in the partition wall portion 30, most of the rear end surface (upper end in FIG. 7) is located behind the front end of the missing portion 20, but in the portion where the liquid communication groove portion 31 is formed, the rear end surface ( The front end surface of the liquid communication groove portion 31) is located further forward than the front end of the missing portion 20.
At this time, the length from the front end of the missing portion 20 to the front end of the liquid communication groove portion 31 is a sufficiently long length determined in advance by experiments or the like, and when ink passes through the liquid communication groove portion 31 (see FIG. 8). The ink does not flow into the missing part 20.

  Therefore, even if a large amount of ink flows into any one of the storage parts, the ink flows into the other storage part at a position sufficiently away from the missing part 20, so that the inner cylinder part from the one storage part Ink can be prevented from flowing into the inside of 11b.

  Further, when ink flows from one reservoir to another reservoir, the ink flows only from the portion where the liquid communication groove 31 is formed. That is, ink does not flow over the entire partition wall portion 30 extending in the radial direction of the shaft tube portion 2, but ink flows from a portion of the relatively front side. Therefore, it is preferable that the partition wall portion 30 that also functions as a rib for increasing the strength need not be unnecessarily small (the length in the front-rear direction is shortened).

  Furthermore, in this embodiment, the liquid communication groove part 31 is formed at a position from the inner cylinder part 11b. For this reason, even if ink falls to a portion of the rear end surface of the partition wall portion 30 where the liquid communication groove portion 31 is not formed and flows toward the inner cylinder portion 11b, it reaches the liquid communication groove portion 31. Will flow forward. That is, the ink does not reach the missing part 20 of the inner cylinder part 11 b and does not flow into the missing part 20.

Here, the ink storage part 25 is located outside the inner cylinder part 11 b in the spreading direction of the transverse section of the shaft cylinder part 2. And the inner cylinder part 11b is located in the outer side of the nib member 3 in the same direction (refer FIG. 1 etc.).
From this, the ink storage part 25 is located outside the part in which the pen tip member 3 is inserted in the ink occlusion body 4 in the spreading direction of the cross section of the shaft cylinder part 2, and the shaft cylinder part 2. Are opposed to each other in the longitudinal direction.

By the way, when ink leaks forward from the ink occlusion body 4 inside the applicator 1, the portion that becomes the boundary between the outer shell member 35 and the batting 36 is a portion where the ink flows out relatively easily.
That is, the ink storage part 25 of the present embodiment is formed at a position that overlaps in the longitudinal direction of the axial tube part 2 with a part where the ink flows out relatively easily.

In the above-described embodiment, each of the rear end surface of the partition wall portion 30 (the rear end surface of the portion where the liquid communication groove portion 31 is not formed) and the rear end surface of the auxiliary contact rib portion 33 is defined as the rear end surface of the inner cylinder portion 11b. The example which is on the same plane has been described.
However, the present invention is not limited to this, and a structure in which the rear end surface of at least one of these is located behind the rear end surface of the inner cylinder portion 11b may be employed. For example, as shown in FIGS. 9 and 10, a shaft tube portion 102 in which the rear end surface of the auxiliary abutment rib portion 133 is located behind the rear end surface of the inner tube portion 11b may be employed.

  That is, in the axial tube portion 102, the length in the front-rear direction of the auxiliary contact rib portion 133 is longer than the length in the front-rear direction of the partition wall portion 30 and the inner tube portion 11b.

  In the applicator 101 employing the shaft cylinder portion 102, the front end portion of the ink occlusion body 4 and the auxiliary contact rib portion 133 are in contact with each other with the ink occlusion body 4 positioned behind the inner cylinder portion 11b (see FIG. 9). More specifically, the auxiliary contact rib portion 133 is in contact with the outer member 35 of the ink occlusion body 4 and the inner cotton pad 36 adjacent to the inner side in the radial direction. According to such a structure, it is possible to make the ink occlusion body 4 difficult to shift forward from the specified position.

In the above-described embodiment, an example in which the groove-shaped (notched) liquid communication groove portion 31 extending forward from the rear end surface of the partition wall portion 30 is formed at a position from the inner cylinder portion 11b is shown. It is not limited to.
For example, instead of the liquid communication groove portion 31, a through hole penetrating the partition wall portion may be provided. However, from the viewpoint of facilitating the molding of the shaft tube portion, it is preferable to form a groove-like portion or a recessed portion extending rearward from the upper end. Further, the position where the liquid communication groove portion 31 is formed is not limited to the position adjacent to the inner cylinder portion 11b, but may be formed at a position away from the inner cylinder portion 11b to the outside in the spreading direction of the cross section of the shaft cylinder portion. For example, it may be a position adjacent to the inner peripheral surface of the main body cylinder portion.

In the above embodiment, the example in which the diameter of the ink occlusion body 4 is set to about 6.1 mm has been described. The diameter of the ink occlusion body 4 is preferably about 6.1 mm as described above, but can be further increased.
Here, a case where the thickness of the outer shell member 35 (the length from the outer peripheral surface to the inner peripheral surface) is not changed, and the diameter of the outer member 35 is increased to increase the ink occlusion body 4 will be considered.
In this case, the volume of the internal space of the outer shell member is increased, and the amount of batting 36 accommodated is increased. For this reason, the amount of ink accommodated can be increased. On the other hand, the ratio of the heat-sealed portion in the total amount of the batting 36 is reduced, and the deviation tends to increase when the batting 36 is displaced forward.

From the above, when the diameter of the ink occlusion body is increased, it is preferable to increase the distance L1 from the opening surface of the air flow passage to the ink occlusion body accordingly.
For example, in the above example, the diameter of the ink occlusion body 4 is about 6.1 mm and the distance L1 is about 2.0 mm. However, when the diameter of the ink occlusion body 4 is about 15.0 mm, the distance L1 is 3 It may be about 0.0 mm.
That is, when the distance L1 is X1 and the diameter of the ink occlusion body is X2, it is preferable to increase the distance so as to satisfy the relationship of the following formula (1).
1.5 × (X2 / 6.1) ≦ X1 ≦ 6.0 × (X2 / 6.1) (1)
Note that a more preferable value of the distance L1 is also variable according to the above formula (1).

  Subsequently, a detailed structure of the air flow passage 38 formed in the applicator 1 of the above-described embodiment will be described.

In the applicator 1, as described above, the air flow passage 38 extending in the longitudinal direction of the shaft tube portion 2 (the pen tip member 3) is formed at a position adjacent to the outer peripheral surface of the pen tip member 3. And the clearance gap part formed between the inner cylinder part 11b and the back axis | shaft part 3b forms a part of this air flow path 38. FIG.
Here, from the viewpoint of more reliably preventing ink leakage, as shown in FIG. 11, the length (maximum length) L2 of the gap portion in the radial direction of the shaft tube portion 2 is larger than 0.04 mm and 0. 0.5 mm or less is preferable. More specifically, the gap portion length L2 is more preferably not less than 0.45 and not more than 0.5 mm, and still more preferably not less than 0.05 mm and not more than 0.5 mm. In this embodiment, it is 0.05 mm.
In other words, the difference between the inner diameter L3 of the inner cylinder portion 11b and the radial length L4 of the rear shaft portion 3b is preferably greater than 0.08 mm and less than or equal to 1 mm. More specifically, the difference between L3 and L4 is more preferably 0.09 mm or more and 1 mm or less, and further preferably 0.1 mm or more and 1 mm or less. In this embodiment, it is 1 mm.
Further, the “radial length of the rear shaft portion 3b” here is a diameter of a portion (hereinafter also referred to as an in-cylinder arrangement portion) located inside the inner cylinder portion 11b.

More specifically, when the gap portion is too narrow (the length L2 is too short), the ink that has oozed out from the rear shaft portion 3b blocks the gap portion, and as a result, the air flow passage 38 is blocked. It may be done. If the air flow passage 38 is blocked, writing failure may occur as described above, or ink that has blocked the air flow passage 38 may leak to the pen tip side.
However, if the gap is made larger than necessary, the volume of the ink reservoir 25 is inevitably reduced, and a large amount of ink cannot be stored in the ink reservoir 25. From the viewpoint of securing a certain amount or more, it is not preferable.
Therefore, in the applicator 1 of the present embodiment, by setting the length L2 of the gap portion in the above-described range, the air flow passage 38 is prevented from being blocked and a sufficient storage amount of the ink storage unit 25 is ensured. ing.

More specifically, when the maximum diameter of the portion where the ink reservoir 25 is formed inside the shaft tube portion 2 is L5, the length L2 of the gap portion is greater than 2% of L5 and 25% or less. It is preferable that it is the length which becomes. More specifically, it is preferably 2.25% or more and 25% or less, and more preferably 2.5% or more and 25% or less.
Similarly, the difference between the inner diameter L3 of the inner cylinder portion 11b and the radial length (diameter) L4 of the in-cylinder arrangement portion of the rear shaft portion 3b may be 4% to 50% of L5. preferable. More specifically, it is more preferably 4.5 percent or more and 50 percent or less, and further preferably 5 percent or more and 50 percent or less.

  In the above-described embodiment, an example of the substantially cylindrical inner cylinder portion 11b is shown, but the present invention is not limited to this. For example, the inner cylindrical portion may be a cylindrical body whose outer shape is a substantially polygonal cylindrical shape or a substantially elliptical cylindrical shape. That is, you may form so that the planar view shape (cross-sectional shape) of an inner hole may become a substantially polygonal shape or a substantially elliptical shape. Therefore, as shown in FIG. 12, an inner cylinder portion 211b formed so that the cross-sectional shape of the inner hole is substantially polygonal may be employed.

Also in this case, a gap portion is formed between the inner peripheral surface of the inner cylinder portion 211b and the rear shaft portion 3b. In this gap portion, the maximum length L6 in the radial direction of the shaft tube portion 202 is in the same range as L2 described above.
At this time, the diameter L7 of the circle C1 (minimum inclusion circle C1) having the smallest area among the virtual circles that can include the inner hole portion of the inner cylinder portion 211b in plan view, and the cylinder of the rear shaft portion 3b. The difference in the radial length (diameter) L8 of the inner arrangement portion is in the same range as the difference between L3 and L4.
In other words, the diameter L7 of the minimum inclusion circle C1 that can include the cross-sectional shape of the inner hole portion, and the cross-sectional diameter L8 of the in-cylinder arrangement portion (the diameter of the minimum circle that can include the cross-sectional shape of the in-cylinder arrangement portion). ) Is in the same range as the difference between L3 and L4.

  In the above-described embodiment, an example in which the cross-sectional shape of the in-cylinder arrangement portion of the rear shaft portion 3b is circular has been shown, but the present invention is not limited to this. For example, the cross-sectional shape of the in-cylinder arrangement portion may be a substantially polygonal shape or a substantially elliptical shape.

  For example, as shown in FIG. 13, a rear shaft portion 303b in which the cross-sectional shape of the in-cylinder arrangement portion is a polygonal shape (rectangular shape) may be employed. In this case, similarly to the above, the inner cylindrical portion 311b formed so that the shape of the inner hole in a plan view may be a polygonal shape.

Also in this case, the maximum length L9 (the maximum length in the radial direction of the shaft tube portion 302) L9 is in the same range as L2 described above.
Furthermore, in a plan view, the radial length (diameter) L10 of the minimum inclusion circle C2 including the inner hole portion of the inner cylinder portion 311b and the radial length (diameter) L11 of the minimum inclusion circle C3 including the rear shaft portion 303b. Is in the same range as the difference between L3 and L4. In other words, the difference between the diameter L10 of the minimum inclusion circle C2 that can include the cross-sectional shape of the inner hole portion and the diameter L11 of the minimum inclusion circle C3 that can include the cross-sectional shape of the in-cylinder arrangement portion is as described above. The range is the same as the difference between L3 and L4.

  That is, in each embodiment, either the inner diameter of the inner cylinder part or the diameter of the smallest inclusion circle including the inner hole part of the inner cylinder part in plan view, and the in-cylinder arrangement in the cross-sectional diameter of the in-cylinder arrangement part or plan view The difference in any one of the diameters of the minimum inclusion circle including the part is in the same range as the difference between L3 and L4 described above.

  Then, the experiment conducted when forming the applicator 1 which concerns on above-described embodiment and the result are demonstrated.

(Experiment 1)
300 applicators similar to the applicator 1 described above are created, 100 of which belong to the first group, the other 100 belong to the second group, and the remaining 100 belong to the third group. It was supposed to be.
In the applicator belonging to the first group, the radial length of the portion corresponding to the in-cylinder arrangement portion of the rear shaft portion is 1.74 mm to 1.85 mm.
In the applicator belonging to the second group, the radial length of the portion corresponding to the in-cylinder arrangement portion of the rear shaft portion is 1.95 mm to 2.01 mm.
In the applicator belonging to the third group, the radial length of the portion corresponding to the in-cylinder arrangement portion of the rear shaft portion was 2.01 mm to 2.09 mm.
These 300 applicators had substantially the same structure except for the rear shaft portion, and used the same ink. Further, the inner diameter of the portion corresponding to the inner cylinder portion was 2.1 mm plus or minus 0.05 mm.

  And the test for confirming the presence or absence of ink leakage with respect to these 300 applicators was performed. Specifically, after leaving the pen tip side downward and leaving it in a constant temperature layer where the ambient temperature becomes 70 degrees for 15 hours (overnight), the presence or absence of ink leakage was confirmed.

After the test, 20 samples were randomly extracted from the applicator belonging to the first group to check for ink leakage. Similarly, 30 inks were randomly extracted from the applicator belonging to the second group to confirm ink leakage, and 30 inks were randomly extracted from the applicator belonging to the third group to confirm ink leakage. .
As a result, the results shown in the graph of FIG. 14 were obtained.

That is, ink leakage was not confirmed in the applicator belonging to the first group.
In addition, in the applicator belonging to the second group, ink leakage was confirmed in 7 pieces, and no ink leakage was confirmed in the other 23 pieces.
Furthermore, in the applicator belonging to the third group, ink leakage was confirmed in all applicators.
In addition, it was confirmed that when the radial length of the portion corresponding to the in-cylinder arrangement portion becomes longer than a certain length (when the gap between the inner tube portion and the rear shaft portion becomes narrower than a certain value), ink leakage occurs. . At this time, among the applicators in which ink leakage has been confirmed, the one having the smallest radial length of the portion corresponding to the in-cylinder arrangement portion has a length of 1.95 mm. There was found.

Therefore, the present inventor has found that the radial length of the portion corresponding to the in-cylinder arrangement portion is 1.7 mm and the range of intersection is plus or minus 0.2 mm from the results of the experiment 1 and the rule of thumb. It was assumed that no leakage occurred. That is, with such a structure, it was considered that the gap formed between the inner cylinder portion and the in-cylinder arrangement portion becomes sufficiently small and ink leakage can be prevented.
And in order to confirm this guess, the following experiment 2 was conducted.

(Experiment 2)
100 applicators similar to the applicator 1 described above were prepared, and the length in the radial direction of the portion corresponding to the in-cylinder arrangement portion was 1.7 plus or minus 0.2 mm. Further, similarly to the above, the structure of other parts except the rear shaft part was made substantially the same, and the same ink was used. Further, the inner diameter of the portion corresponding to the inner cylinder portion was 2.1 mm plus or minus 0.05 mm.
And the test for confirming the presence or absence of the ink leakage similar to the above was done.

As a result of Experiment 2, ink leakage was not confirmed in all applicators.
In addition, a predetermined number of applicators are randomly extracted from these applicators, and the length of the gap portion formed between the inner cylinder portion and the rear shaft portion (the length corresponding to L2 in the above embodiment) is set. When measured, the minimum value was 0.05 mm.

  Here, the present inventor determined that the length of the gap formed between the inner tube portion and the rear shaft portion is 0.05 mm or more based on the result of the experiment 2 and the empirical rule, thereby preventing ink leakage. It was considered that it would not occur. And in order to verify this idea, the following experiment 3 and experiment 4 were implemented.

(Experiment 3)
100 applicators similar to the applicator 1 described above were prepared, and the length in the radial direction of the portion corresponding to the in-cylinder arrangement portion was 1.9 plus or minus 0.2 mm. That is, in response to the result of Experiment 1, a plurality of applicators that were predicted to cause ink leakage in part and no ink leakage in part were prepared. In this experiment 3 as well, the same structure was used for the other parts except for the rear shaft part, and the same ink was used. Further, the inner diameter of the portion corresponding to the inner cylinder portion was 2.1 mm plus or minus 0.05 mm.
And the test for confirming the presence or absence of the ink leakage similar to the above was done.

  And about the applicator in which the ink leakage which was extracted at random two was not confirmed, the length of the crevice part formed between an inner cylinder part and a back axis part (length equivalent to L2 of the above-mentioned embodiment) As a result, all of them were 0.05 mm or more in length.

(Experiment 4)
Ninety applicators similar to the applicator 1 described above were prepared, and a test for confirming the presence or absence of ink leakage similar to the above was performed.
And the presence or absence of ink leakage was confirmed about the applicator from which the length (length corresponding to L2 of the said embodiment) of the clearance gap part formed between an inner cylinder part and a back axial part differs.

As a result, in the applicator in which the length of the gap formed between the inner cylinder portion and the rear shaft portion is 0.00 mm to 0.04 mm, ink leakage was confirmed in all applicators.
On the other hand, in the applicator where the length of the gap portion is 0.05 mm to 0.07 mm, ink leakage is not confirmed in all applicators, and the length of the gap portion is 0.11 mm to 0.17 mm. Also, no ink leakage was confirmed in the applicator.

  From the above experiments, it was confirmed that ink leakage does not occur when the length of the gap portion in the radial direction of the shaft tube portion 2 (the length of L2 described above) is larger than 0.04 mm. From this result and empirical rule, it has been found that the length of L2 is preferably larger than 0.04 mm and not larger than 0.5 mm in order to ensure a sufficient volume of the ink reservoir.

DESCRIPTION OF SYMBOLS 1 Applicator 2 Shaft cylinder part 3 Pen tip member (applying body)
4 Ink occlusion body (coating liquid occlusion body)
10 Main body cylinder part 11 Installation cylinder part (inner small cylinder part)
15 Connecting plate (dividing wall)
25 Ink reservoir (coating solution reservoir)
25a 1st storage part (small storage space)
25b 2nd storage part (small storage space)
25c 3rd storage part (small storage space)
25d 4th storage part (small storage space)
30 partition wall (partition wall, protrusion)
31 Liquid communication groove (liquid flow hole)
33 Auxiliary abutment rib (protrusion)
38 Air flow passage 38a Rear end side opening surface (opening portion, facing opening surface)
38b Side opening surface (opening part)

Claims (14)

A shaft cylinder part, a coating liquid storage body accommodated in the shaft cylinder part, and a coating body for coating the coating liquid, and supplying the coating liquid impregnated in the coating liquid storage body to the coating body An applicator that performs
The shaft tube portion has a storage space for storing the coating liquid storage body,
An air flow passage communicating with the housing space and the outside is formed;
The air flow passage has an opening portion facing the accommodation space;
At least a part of the opening portion is formed at a position overlapping with the coating liquid storage body in the longitudinal direction of the shaft cylinder portion and faces the coating liquid storage body,
The distance between the coating liquid storage body and the facing opening surface is 1.5 mm or more and 6.0 mm or less when a portion of the opening portion facing the coating liquid storage body is a facing opening surface. Applicator to do. The shaft tube portion has a main body tube portion and an inner small tube portion,
The housing space is formed inside the main body cylinder part,
At least a part of the inner small tube portion is located inside the accommodation space,
The application body is held on the front end side of the shaft cylinder part, a part thereof is positioned inside the inner small cylinder part, and a part of the rear side thereof from the inside of the inner small cylinder part to the application liquid storage body. And the rear end side portion is in contact with the coating solution occlusion body,
The air flow passage is formed from the outside of the shaft tube portion through the internal space of the inner small tube portion to be connected to the housing space, and a part thereof is between the inner small tube portion and the application body. It is a gap part formed in,
The applicator according to claim 1, wherein the opposed opening surface is located at a rear end portion of the inner small tube portion. The main body cylinder part is formed with a protruding part,
The protruding portion is disposed at a position that is on the outer side in the direction in which the transverse cross section of the axial tube portion extends than the inner small tube portion,
The rear end surface of the protruding portion is located on the same plane as the rear end surface of the inner small tube portion, or is located behind the rear end surface of the inner small tube portion, and the coating liquid The applicator according to claim 2, wherein the applicator is located in front of the occlusion body and further overlaps the application liquid occlusion body in the longitudinal direction of the shaft tube portion. The application body is held on the front end side of the shaft tube portion,
A coating liquid storage part capable of storing the coating liquid at a position on the front side of the coating liquid storage body is formed inside the shaft cylinder part,
The coating liquid storage section has a plurality of small storage spaces partitioned by a partition wall section,
The partition wall is formed with a liquid circulation hole in part from the rear end side,
The liquid circulation hole portion communicates with two adjacent small storage spaces,
Each of the small storage spaces can store a predetermined amount of the coating liquid individually,
A predetermined amount or more of the coating liquid flows into the one small storage space, so that the liquid circulation hole portion from the one small storage space to the other small storage space adjacent to the one small storage space. The applicator according to any one of claims 1 to 3, wherein the coating liquid flows in through the container. The shaft tube portion has a main body tube portion and an inner small tube portion,
Inside the main body cylinder part, the inner peripheral surface of the main body cylinder part and the outer peripheral surface of the inner small cylinder part are spaced apart in the direction in which the transverse cross section of the shaft cylinder part spreads,
The coating liquid storage part is formed between an inner peripheral surface of the main body cylinder part and an outer peripheral surface of the inner small cylinder part, and the partition wall part has at least a front end side inner peripheral surface of the main body cylinder part. The applicator according to claim 4, wherein the applicator is continuous with each of the outer peripheral surfaces of the inner small tube portion. It has a dividing wall portion that divides the space formed between the inner peripheral surface of the main body cylindrical portion and the outer peripheral surface of the inner small cylindrical portion in the front-rear direction,
The dividing wall portion is configured to close the front side of the small storage space to form a bottom portion,
The applicator according to claim 5, wherein the main body cylinder part, the inner small cylinder part, the partition wall part, and the dividing wall part are integrally formed. A shaft cylinder part, a coating liquid storage body accommodated in the shaft cylinder part, and a coating body for coating the coating liquid, and supplying the coating liquid impregnated in the coating liquid storage body to the coating body An applicator that performs
The coating liquid occlusion body is formed by accommodating a fiber converging body inside a cylindrical outer member,
The shaft tube portion has a storage space for storing the coating liquid storage body,
An air flow passage communicating with the housing space and the outside is formed;
The air flow passage has an opening portion facing the accommodation space;
At least a part of the opening portion is formed at a position overlapping with the coating liquid storage body in the longitudinal direction of the shaft cylinder portion and faces the coating liquid storage body,
The distance between the coating liquid storage body and the opposing opening surface when the portion facing the coating liquid storage body in the opening portion is the opposing opening surface is X1, and the diameter of the coating liquid storage body is X2. An applicator characterized by satisfying the relationship of the following formula (1).
1.5 × (X2 / 6.1) ≦ X1 ≦ 6.0 × (X2 / 6.1) (1) The shaft tube portion has a main body tube portion and an inner small tube portion,
The application body is a part of which is located inside the inner small tube portion,
The air flow passage is formed from the outside of the shaft tube portion through the internal space of the inner small tube portion to be connected to the housing space, and a part thereof is between the inner small tube portion and the application body. It is a gap part formed in,
The applicator according to claim 1, wherein a radial length of the shaft cylinder portion of the gap portion is greater than 0.04 mm and 0.5 mm or less. It has a dividing wall portion that divides the space formed between the inner peripheral surface of the main body cylindrical portion and the outer peripheral surface of the inner small cylindrical portion in the front-rear direction,
The applicator according to claim 8, wherein the dividing wall portion closes a front side of the accommodation space. A coating liquid storage part capable of storing the coating liquid at a position on the front side of the coating liquid storage body is formed inside the shaft cylinder part,
The coating liquid storage section has a plurality of small storage spaces partitioned by a partition wall section,
The dividing wall portion is configured to close the front side of the small storage space to form a bottom portion,
The applicator according to claim 9, wherein the main body cylinder part, the inner small cylinder part, the partition wall part, and the dividing wall part are integrally formed. The inner hole of the inner small cylinder part is a hole having a substantially circular cross-sectional shape,
The said application body has the in-cylinder arrangement | positioning part located inside the said inner side small cylinder part, The cross-sectional shape of the said in-cylinder arrangement | positioning part is a shape used as a substantially circle shape, The thru | or 8 thru | or characterized by the above-mentioned. The applicator according to any one of 10 above. A shaft cylinder part, a coating liquid storage body accommodated in the shaft cylinder part, and a coating body for coating the coating liquid, and supplying the coating liquid impregnated in the coating liquid storage body to the coating body An applicator that performs
The shaft tube portion has a main body tube portion and an inner small tube portion, and has an accommodating space for accommodating the coating liquid storage body therein.
An air flow passage communicating with the housing space and the outside is formed;
The application body is a part of which is located inside the inner small tube portion,
The air flow passage is formed from the outside of the shaft tube portion through the internal space of the inner small tube portion to be connected to the housing space, and a part thereof is between the inner small tube portion and the application body. It is a gap part formed in,
The applicator characterized in that a radial length of the shaft tube portion of the gap portion is greater than 0.04 mm and 0.5 mm or less. A shaft cylinder part, a coating liquid storage body accommodated in the shaft cylinder part, and a coating body for coating the coating liquid, and supplying the coating liquid impregnated in the coating liquid storage body to the coating body An applicator that performs
The shaft tube portion has a main body tube portion and an inner small tube portion, and has an accommodating space for accommodating the coating liquid storage body therein.
The inner hole of the inner small cylinder part is a hole having a substantially circular cross-sectional shape,
The application body has an in-cylinder arrangement part located inside the inner small cylinder part, and the cross-sectional shape of the in-cylinder arrangement part is substantially circular,
An air flow passage communicating with the housing space and the outside is formed;
The air flow passage is formed so as to be connected to the housing space from the outside of the shaft tube portion through the inner space of the inner tube portion, and a part of the air flow passage is formed between the inner tube portion and the tube arrangement portion. It is a gap part formed between
The applicator characterized in that a difference between an inner hole diameter of the inner small cylinder part and a cross-sectional diameter of the in-cylinder arrangement part is greater than 0.08 mm and 1 mm or less. A shaft cylinder part, a coating liquid storage body accommodated in the shaft cylinder part, and a coating body for coating the coating liquid, and supplying the coating liquid impregnated in the coating liquid storage body to the coating body An applicator that performs
The shaft tube portion has a main body tube portion and an inner small tube portion, and has an accommodating space for accommodating the coating liquid storage body therein.
The application body has an in-cylinder arrangement portion located inside the inner small cylinder portion,
An air flow passage communicating with the housing space and the outside is formed;
The air flow passage is formed from the outside of the shaft tube portion through the internal space of the inner small tube portion so as to be continuous with the housing space, and a part thereof is the in-cylinder arrangement portion and the in-cylinder arrangement portion. It is a gap part formed between
The minimum inclusion circle that can include the cross-sectional shape of the inner hole of the inner small cylinder portion is defined as a first minimum inclusion circle, and the minimum inclusion circle that can include the cross-sectional shape of the in-cylinder arrangement portion is a second minimum inclusion circle. An applicator characterized in that, when a circle is used, the difference between the diameter length of the first minimum inclusion circle and the diameter length of the second minimum inclusion circle is greater than 0.08 mm and 1 mm or less.

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