JP6452228B2 - Liquid applicator - Google Patents

Description

  The present invention relates to a liquid applicator, and more particularly, to a liquid applicator including a liquid supply member for supplying a liquid in a shaft tube to a tip application body.

  Conventionally, various liquid applicators having a liquid supply mechanism for supplying a liquid to a coating body from a liquid storage section in which liquid such as low-viscosity ink or liquid cosmetics are stored have been provided. For example, Patent Document 1 discloses a direct liquid writing instrument which is a liquid applicator in which an ink storage chamber in which liquid low-viscosity ink is stored is partitioned in the axial direction by a plurality of partition walls. The partition wall is formed with a through hole penetrating in the axial direction. An ink supply body that supplies ink to the pen body through the ink storage chamber is inserted through the through hole. A gap is formed between the ink supply body and the through hole. In a steady state, an ink liquid film is formed in the gap and sealed. When a change in the internal pressure of the ink storage chamber occurs, the ink liquid film formed in the gap is broken and so-called gas-liquid exchange is performed.

JP 2001-315383 A

  When the writing instrument disclosed in Patent Document 1 is manufactured, since the partition walls are fixed and assembled one by one in the ink storage chamber, the assembly work becomes complicated. Furthermore, since the dimensional error in the partition formed by resin injection molding or the like differs for each partition, the dimensional error in the assembled state in which these are integrated may increase. In this case, the through holes in each partition wall are assembled with their centers shifted. Even if the ink supply body is inserted into the through holes of the plurality of partition walls thus assembled, the gaps between the through holes and the ink supply body are uniformly formed by shifting the centers of the partition walls. It is difficult to do. As a result, a liquid film of ink that should be formed in the gap is not formed in a place where the gap is formed to be large, and air circulation is difficult in a place where the gap is formed extremely small. Therefore, the predetermined performance as a writing instrument which is a liquid applicator cannot be exhibited.

  Accordingly, an object of the present invention is to provide a liquid applicator that can easily assemble a liquid applicator and that has improved dimensional accuracy of a partition plate and the like after assembly.

In order to solve the above problems, according to the first invention of the present invention,
A liquid storage part is formed inside, a shaft cylinder provided with an application body at the front end, and
A communication cylinder provided inside the shaft cylinder including the liquid storage section, and a liquid guide core is inserted therein;
An enclosing plate extending radially outward from the outer periphery of the communication tube and enclosing a liquid in the liquid storage portion;
A plurality of partition plates extending radially outward from the outer periphery of the communication tube are formed at a predetermined interval at a position on the rear end side of the communication plate in the communication tube, and the plurality of partition plates The liquid reservoir is partitioned into a plurality of small liquid chambers;
Side wall openings are respectively formed at positions between the two adjacent partition plates or between the adjacent enclosing plate and the partition plate in the communication tube,
A part of the peripheral edge of the partition plate is in contact with the inner peripheral surface of the shaft cylinder, and another part of the peripheral edge of the partition plate is configured to be separated from the inner peripheral surface of the shaft cylinder ,
A liquid applicator characterized in that the side wall openings respectively opened in the small liquid chambers adjacent to each other across the one partition plate are arranged at positions shifted from each other in the circumferential direction in the communication cylinder. It is done.

According to the second invention of the present invention, in addition to the features of the first invention,
The rear end portion of the communication tube protrudes into a small liquid chamber (hereinafter referred to as “rear end small liquid chamber”) located at the rearmost end in the liquid storage portion,
The portion defining at least the rearmost end small liquid chamber in the shaft cylinder cannot visually recognize the rear end portion of the communication cylinder from the outside when the rear end small liquid chamber is filled with liquid. When the liquid in the chamber is consumed , a liquid applicator characterized in that the rear end portion of the communication tube can be visually recognized from the outside is obtained.

In order to solve the above problem, according to the third invention of the present invention,
A liquid storage part is formed inside, a shaft cylinder provided with an application body at the front end, and
A communication cylinder provided inside the shaft cylinder including the liquid storage section, and a liquid guide core is inserted therein;
An enclosing plate extending radially outward from the outer periphery of the communication tube and enclosing a liquid in the liquid storage portion;
A plurality of partition plates extending radially outward from the outer periphery of the communication tube are formed at a predetermined interval at a position on the rear end side of the communication plate in the communication tube, and the plurality of partition plates The liquid reservoir is partitioned into a plurality of small liquid chambers;
Side wall openings are respectively formed at positions between the two adjacent partition plates or between the adjacent enclosing plate and the partition plate in the communication tube,
A part of the peripheral edge of the partition plate is in contact with the inner peripheral surface of the shaft cylinder, and another part of the peripheral edge of the partition plate is configured to be separated from the inner peripheral surface of the shaft cylinder,
The rear end portion of the communication tube protrudes into a small liquid chamber (hereinafter referred to as “rear end small liquid chamber”) located at the rearmost end in the liquid storage portion,
The portion defining at least the rearmost end small liquid chamber in the shaft cylinder cannot visually recognize the rear end portion of the communication cylinder from the outside when the rear end small liquid chamber is filled with liquid. When the liquid in the chamber is consumed , a liquid applicator characterized in that the rear end portion of the communication tube can be visually recognized from the outside is obtained.

According to the fourth invention of the present invention, in addition to the features of the third invention,
A pair of the side wall openings are formed at positions between two adjacent partition plates or between the adjacent enclosing plate and the partition plate in the communication tube,
A liquid applicator characterized in that the pair of side wall openings are arranged to face each other in the communication tube .

According to a fifth aspect of the present invention, in addition to any one of the features of the first to fourth aspects,
A plurality of inward projections projecting radially inward are formed on the inner peripheral surface of the shaft cylinder in the circumferential direction,
Each of the inward projections abuts on the peripheral edge of the partition plate, and a portion between two inner protrusions adjacent in the circumferential direction on the inner peripheral surface of the shaft cylinder is separated from the peripheral edge of the partition plate. The liquid applicator characterized by being comprised is obtained.

According to the sixth aspect of the present invention, in addition to the features of the fifth aspect,
Each of the inward projections extends in the axial direction, and a liquid applicator characterized by being formed so as to contact the peripheral edges of the plurality of partition plates is obtained.

According to a seventh aspect of the present invention, in addition to any one of the features of the first to sixth aspects,
A liquid applicator characterized in that a liquid holding body for holding the liquid overflowing from the liquid storage part is provided at a position on the front end side of the communication tube in the front end side .

The present invention has the following effects. That is, according to the first and third aspects of the present invention, the partition plate, the enclosing plate, and the communication cylinder can be integrally formed by injection molding, and the liquid induction core can be inserted into the communication cylinder. Therefore, the liquid applicator according to the first aspect of the present invention can significantly reduce the number of assembling steps compared to a conventional liquid applicator that fixes a plurality of partition plates one by one in the shaft cylinder.

In addition, according to the first and third inventions, a gap is formed with a desired dimensional accuracy between the peripheral edge of the partition plate and the inner peripheral surface of the shaft tube, so that the liquid film is stabilized in this gap. Will be formed.

Further, according to the first and fourth aspects of the present invention, the communication cylinder is accurately injection-molded by the side wall openings disposed so as to be shifted from each other in the circumferential direction or the pair of side wall openings disposed opposite to each other. can do. That is, in the mold structure for forming the communication cylinder and the partition plate by injection molding, the pin member for forming the side wall opening of the communication cylinder supports the core pin for forming the inner peripheral surface of the communication cylinder. Can be formed. Thereby, it is possible to perform injection molding with high accuracy by making the inner peripheral surface of the communication cylinder through which the liquid guide core is inserted straight. Therefore, in any case, such as when a predetermined gap is formed around the liquid guide core, or when no gap is formed around the liquid guide core, the liquid is maintained while maintaining a desired dimension around the liquid guide core. The applicator can be assembled.

  Furthermore, although the bending strength of the communication tube is weakened in the direction in which the side wall opening is opened, the side wall opening according to the present invention is a side wall opened to each of the adjacent small liquid chambers across one partition plate. Since the openings are arranged at positions displaced from each other in the circumferential direction, or are arranged so as to be opposed to each other, one direction around the axis does not become extremely weak. Therefore, it is possible to form partition plates, communication cylinders, and the like with good strength balance while reducing warpage due to shrinkage after injection molding, so that the liquid applicator can be assembled smoothly.

According to the fifth aspect of the present invention, the inner peripheral surface of the shaft tube is provided with an inward protrusion that protrudes radially inward. Therefore, a gap having an interval corresponding to the projecting width of the inward projection can be formed between the inner peripheral surface of the shaft cylinder and the peripheral edge of the partition plate. A liquid film can be formed.

Moreover, according to 6th invention among this invention, an inward protrusion is continuously formed in rib shape. Therefore, when the shaft cylinder having the liquid storage portion is formed by injection molding of resin, a groove for forming an inward projection is provided on the outer periphery of the core pin, and the shaft cylinder can be formed with high accuracy. Therefore, the uniformly formed inward projections and the peripheral edge of the partition plate come into contact with each other, and a gap is formed between the peripheral edge of the partition plate and the inner peripheral surface of the shaft cylinder, so that the gap for each partition plate is formed uniformly. Can do.

In addition, according to the seventh aspect of the present invention, there is further provided a liquid holding body that is formed so that the liquid can be temporarily held when the internal pressure of the liquid storage portion increases. Therefore, even when the internal pressure of the liquid storage part rises in the outside air temperature or the external air pressure becomes low due to an aircraft or the like, the liquid in the liquid storage part can be temporarily held, so that the liquid is ejected from the application body. Can be prevented.

According to the second and third aspects of the present invention, when the ink in the rearmost small liquid chamber is consumed, the user can visually recognize the rear end portion of the communication tube from the outside of the shaft tube. Thus, the user can recognize that the ink in the liquid storage portion has been consumed.

It is a longitudinal cross-sectional view of the writing instrument which concerns on the 1st Embodiment of this invention. It is a perspective view of the liquid supply member which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the axial cylinder main body which concerns on the 1st Embodiment of this invention. It is the side view seen from the front side of the axial cylinder main body concerning the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the rear-end side part of the writing instrument which concerns on the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the modification of the writing instrument which concerns on embodiment of this invention. It is a perspective view which shows the modification of the liquid supply member which concerns on embodiment of this invention. It is a perspective view which shows the modification of the liquid supply member which concerns on embodiment of this invention. It is the sectional view on the AA line of FIG.

(First embodiment)
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a writing instrument 1A according to an embodiment of the liquid applicator of the present invention. The writing instrument 1A is a whiteboard marker. The writing instrument 1 </ b> A includes a shaft cylinder 10 having a liquid storage portion 14 therein and an application body 18 at a front end portion, and an outer tube 2 attached to the outer periphery of the shaft tube 10. In the present embodiment, a writing tip (pen body) made of a fiber bundle is attached to the front end portion of the shaft tube 10 as an application body 18. The shaft tube 10 includes a shaft tube main body 11 in which a liquid storage portion 14 for storing ink as liquid is formed, and a front tube 12 fixed to the front end portion of the shaft tube main body 11. A cap 3 is detachably attached to the front end portion of the outer cylinder 2. In the writing instrument 1A according to the first embodiment, when the ink in the liquid storage portion 14 of the shaft tube 10 is consumed, the shaft tube 10 is removed from the outer tube 2 by the user, and the outer tube 2 A new shaft cylinder 10 is mounted inside. That is, in the writing instrument 1A according to the first embodiment, the outer cylinder 2 is configured to be detachably attached to the shaft cylinder 10, but the outer cylinder 2 is detachably attached to the shaft cylinder 10. May be configured.

  The shaft cylinder main body 11 is formed in a bottomed cylindrical shape whose rear end is closed and whose front end is opened. A flange portion 11 a that is annularly continuous in the circumferential direction is formed on the outer peripheral surface of the rear end portion of the shaft cylinder main body 11. A male screw portion 11 b is formed at a predetermined position in front of the flange portion 11 a in the shaft cylinder main body 11. On the other hand, a female screw portion 2 a is formed on the inner peripheral surface of the rear end portion of the outer cylinder 2. The shaft cylinder body 11 is fixed to the outer cylinder 2 by being screwed into the outer cylinder 2 until the flange portion 11a contacts the rear end edge of the outer cylinder 2, and the male screw portion 11b is screwed into the female screw portion 2a. Is done.

  In addition, a liquid supply member 20 is provided inside the shaft tube main body 11. The liquid supply member 20 includes a cylindrical communication cylinder 21 having a front end and a rear end opened. A liquid guide core 50 is inserted into the communication tube 21. The liquid guide core 50 is a fiber bundle solidified by a binder material such as silicon, and can guide the ink in the liquid storage unit 14 to the application body 18 by its capillary force. As shown in FIG. 2, a fixed plate 35, an adjuster 30 (liquid holding body), an enclosing plate 26 and a plurality of partition plates 22 are communicated with the liquid supply member 20 on the outer periphery of the communication tube 21 by resin injection molding. It is formed integrally with the tube 21.

  A fixed plate 35 is formed at the front end of the communication cylinder 21 and extends in a substantially disk shape radially outward from the outer periphery of the communication cylinder 21. A part of the rear end surface of the fixing plate 35 abuts on an inner peripheral surface step portion 11 d formed on the inner peripheral surface of the tip end portion of the shaft tube main body 11, whereby the liquid supply member 20 is positioned in the shaft tube main body 11. Is done. Further, a closing plate 32 is formed at a position on the rear end side of the fixed plate 35 on the outer periphery of the front end portion of the communication tube 21, and extends in a substantially disc shape radially outward from the outer periphery of the communication tube 21. Yes. In addition, at a position on the rear end side of the closing plate 32 on the outer periphery of the front end portion of the communication tube 21, the ink overflowing from the liquid storage portion 14 is temporarily held when the pressure inside the liquid storage portion 14 rises. An adjuster 30 that functions as a liquid holder is formed.

  At a position on the rear end side of the adjuster 30 at the front end portion of the communication tube 21, an encapsulating plate 26 extending in a disk shape from the outer periphery of the communication tube 21 radially outward is formed. The peripheral edge of the disc-shaped encapsulating plate 26 is in close contact with the inner peripheral surface of the shaft cylinder main body 11, and the liquid storage portion 14 is defined by the rear end surface of the encapsulating plate 26 and the inner peripheral surface of the shaft cylinder main body 11. Yes. Therefore, the ink is sealed in the liquid reservoir 14 by the sealing plate 26. A plurality of partition plates 22 extending in a disk shape radially outward from the outer periphery of the communication tube 21 have a predetermined gap at the rear end side of the sealing plate 26 in the communication tube 21. It is formed to be empty. The liquid reservoir 14 is partitioned into a plurality of small liquid chambers 16 by the plurality of partition plates 22. In the present embodiment, seven partition plates 22a to 22g are arranged at equal intervals on the rear end side of the communication tube 21 with respect to the sealing plate 26, and the liquid storage unit 14 includes eight small liquid chambers 16a to 16g. It is divided into 16h.

  Next, the shaft cylinder main body 11 will be described. FIG. 3 shows a longitudinal section of the shaft tube main body 11, and FIG. 4 shows a side surface of the shaft tube body 11 viewed from the front side. A plurality of inward projections 17 projecting radially inward from the inner peripheral surface of the shaft cylinder main body 11 are formed at intervals in the circumferential direction. In the present embodiment, as shown in FIG. 3, each inward projection 17 is formed in a rib shape continuous in the axial direction on the inner peripheral surface of the shaft tube main body 11, and from the rear end wall 11 c of the shaft tube body 11. It extends to a position corresponding to the peripheral edge 220 of the partition plate 22a on the foremost end side. Further, as shown in FIG. 4, four inward projections 17 are arranged on the inner peripheral surface of the shaft cylinder main body 11 at equal intervals.

  In the present embodiment, a part of the peripheral edge 220 of the partition plate 22 abuts on the inner peripheral surface of the shaft cylinder 10, and the other part of the peripheral edge 220 of the partition plate 22 is separated from the inner peripheral surface of the shaft cylinder 10. It is configured. Specifically, each inward projection 17 formed on the inner peripheral surface of the shaft tube main body 11 abuts on the peripheral edge 220 of the partition plates 22 a to 22 g and is adjacent in the circumferential direction on the inner peripheral surface of the shaft tube main body 11. The site | part between the two inward projections 17 which fit each other is spaced apart from the peripheral edge 220 of the partition plates 22a-22g. That is, a gap (hereinafter referred to as “gap G3”) is provided between a portion between two inner protrusions 17 adjacent in the circumferential direction on the inner circumferential surface of the shaft cylinder main body 11 and the peripheral edge 220 of the partition plates 22a to 22g. (See FIG. 1).

  In addition, the inward protrusion 17 of this embodiment is extended in the axial direction on the inner peripheral surface of the shaft tube 10 so as to contact the peripheral edges 220 of the plurality of partition plates 22. As another example of the inward protrusion, the inner protrusion corresponds to the peripheral edge 220 of the one partition plate 22 on the inner peripheral surface of the shaft tube 10 so that one inward protrusion comes into contact with the peripheral edge 220 of the one partition plate 22. Inward protrusions may be intermittently formed at the positions where the movement is performed.

  As shown in FIGS. 1 and 2, the communication tube 21 is formed with a side wall opening 23 at a position between two adjacent partition plates 22 or between an adjacent enclosing plate 26 and the partition plate 22a. ing. In the present embodiment, one side wall opening 23 a is opened at a position between the sealing plate 26 and the partition plate 22 a in the communication tube 21, and two adjacent partition plates 22 a in the communication tube 21. Side wall openings 23b to 23g are opened one by one at positions between ˜22g. These side wall openings 23 a to 23 g are opened in a rectangular shape that is long in the axial direction on the side wall of the communication tube 21. And the side wall opening part 23 of the small liquid chamber 16 adjacent on both sides of the one partition plate 22 is arrange | positioned in the position which mutually shifted | deviated 180 degree | times to the circumferential direction. In the present embodiment, the side wall openings 23a, c, e, and g that open to the small liquid chambers 16a, c, e, and g are formed in the lower portion of the communication cylinder 21 in FIG. , F are formed in the upper part of the communication tube 21 in FIG. A groove 24 connected to the side wall opening 23g of the communication cylinder 21 is formed on the front surface of the rearmost partition plate 22g.

  As shown in FIG. 2, the adjuster 30 is formed with a plurality of sheet bodies 33 positioned between the sealing plate 26 and the closing plate 32 on the outer periphery of the communication cylinder 21. Each single wafer 33 is formed in a thin disk shape extending radially outward from the outer periphery of the communication tube 21. The adjuster 30 is formed so that the interval between the opposing sheet bodies 33 is narrower at the rear end side than at the front end side. As shown in FIG. 1, an ink groove 25 continuous in the axial direction is formed at a position between the sealing plate 26 and the closing plate 32 on the outer periphery of the communication cylinder 21, A slit 34 cut from the peripheral edge to the ink groove 25 of the communication cylinder 21 is formed. In addition, two flow holes 36 and 37 are passed through the rear end portion of the ink groove 25 in the communication tube 21. In addition, a cutout portion 38 is formed in each sheet body 33 at a position shifted 180 degrees in the circumferential direction from the slit 34 and is cut out radially inward from the periphery of the sheet body 33.

  In the closing plate 32, a notch portion 32 a is formed at a position facing the notch portion 38 of the sheet body 33 and is notched radially inward from the periphery of the closing plate 32. Further, the fixing plate 35 is formed with a notch 35a that is notched radially inward from the peripheral edge thereof. The cutout portion 32a of the closing plate 32 and the cutout portion 35a of the fixed plate 35 are arranged at positions shifted 180 degrees in the circumferential direction in the shaft cylinder 10. Therefore, the notch portion 35a of the fixing plate 35, the notch portion 32a of the closing plate 32, and the flow holes 36 and 37 of the communication cylinder 21 are alternately displaced in the circumferential direction, and the gas-liquid exchange is performed. The inflow of outside air and the blowing of air when the pressure in the liquid storage unit 14 rises are not abruptly performed.

  As shown in FIG. 1, the front tube 12 includes a base tube portion 12d attached to the front end portion of the shaft tube main body 11, and a front end tube portion 12a whose diameter is reduced stepwise from the front end of the base tube portion 12d. ing. A cylindrical connecting cylinder 12c is formed inside the base cylinder portion 12d. The rear end portion of the connecting tube 12 c is inserted into the front end portion of the communication tube 21. A plurality of holding ribs 12b extending in the shape of ribs in the axial direction are formed on the inner peripheral surface of the front end cylinder portion 12a. The application body 18 inserted into the front end cylinder part 12a is held in the front end cylinder part 12a by a plurality of holding ribs 12b. The rear end surface of the application body 18 is in contact with the front end surface of the connecting cylinder 12c.

  The liquid guide core 50 is inserted into the communication cylinder 21, and the rear end of the liquid guide core 50 protrudes from the rear end opening of the communication cylinder 21 and is located in the small liquid chamber 16 h. On the other hand, the front end portion of the liquid guide core 50 protrudes from the front end opening of the communication tube 21 and is fitted into the connecting tube 12 c so as to be in contact with the rear end of the application body 18. Further, an ink liquid film can be formed between a portion of the inner peripheral surface of the communication cylinder 21 extending from the rear end thereof to the vicinity of the closing plate 32 and the outer peripheral surface of the liquid guide core 50 facing this portion. A gap is formed.

  Next, regarding the writing instrument 1A according to the present invention, the operation of the writing instrument 1A with the application body 18 facing downward will be described. First, when the liquid reservoir 14 is full of ink, an ink liquid film is formed at least in the ink groove 25 and the flow holes 36 and 37, so that the ink is held in the liquid reservoir 14. . The ink grooves 25 and the flow holes 36 and 37 are hereinafter referred to as “gap G1”.

  When the cap 3 is removed from the outer cylinder 2 of the writing instrument 1A and ink is applied to the object by the application body 18, the outside air is a gap between the inner peripheral surface of the front end cylinder portion 12a and the outer peripheral surface of the application body 18. And reaches the adjuster 30 through the inside of the base cylinder portion 12d, the cutout portion 35a of the fixing plate 35, and the cutout portion 32a of the closing plate 32. The air that has reached the adjuster 30 breaks the ink liquid film formed in the gap G 1 and flows into the communication cylinder 21 from the flow holes 36 and 37. It flows into the small liquid chamber 16a from the side wall opening 23a through the gap between the outer peripheral surface.

  Here, when the small liquid chamber 16b is filled with ink, a gap (hereinafter referred to as “gap G2”) between the inner peripheral surface of the communication tube 21 and the outer periphery of the liquid guide core 50 in the vicinity of the partition plate 22a. Also, a liquid film of ink is formed. Further, a liquid film of ink is also formed in a gap G3 formed between the peripheral edge 220 of the partition plate 22a and the inner peripheral surface of the shaft cylinder main body 11. Therefore, if ink is continuously applied to the object by the applying body 18, air flows into the small liquid chamber 16a from the gap G1 and the side wall opening 23a by gas-liquid exchange, but does not flow into the small liquid chamber 16b. Out of the reservoir 14, the ink in the small liquid chamber 16 a flows out to the liquid guiding core 50. When the ink in the small liquid chamber 16a is consumed, air breaks the liquid film in the gap G2 and the gap G3 and flows into the small liquid chamber 16b, and the ink in the small liquid chamber 16b flows out to the liquid guide core 50. . Thus, the ink in the liquid storage unit 14 is sequentially consumed from the small liquid chamber 16a to the small liquid chamber 16g. In the writing instrument 1A according to the present embodiment, the ink holding force in the gap G3 is stronger than the ink holding force of the liquid guiding core 50 so that the ink in the small liquid chambers 16b to 16h flows out to the liquid guiding core 50. It is configured.

  As described above, according to the present embodiment, the communication tube 21, the partition plate 22, and the sealing plate 26 are integrally formed by injection molding, and the liquid induction core 50 is inserted into the communication tube 21. Therefore, the writing instrument 1A according to the present embodiment can significantly reduce the number of assembling steps as compared with a conventional liquid applicator that fixes a plurality of partition plates one by one in the shaft cylinder. Further, according to the present embodiment, a gap is formed with a desired dimensional accuracy between the peripheral edge of the partition plate and the inner peripheral surface of the shaft tube, and thus a liquid film is stably formed in this gap. Become so.

  Further, when the communication cylinder 21 is injection-molded, the core pin forming the communication cylinder 21 can be supported by the pin forming the side wall opening 23. Therefore, the core pin is bent at the time of injection molding, and as a result, the communication tube 21 is prevented from warping.

  The liquid guide core 50 is attached to the communication cylinder 21 of the liquid supply member 20, and the liquid supply member 20 is inserted into the shaft cylinder body 11. Here, as described above, the communication tube 21 and the partition plate 22 of the liquid supply member 20 are integrally formed straight, so that the liquid supply member 20 can be easily inserted into the shaft tube main body 11.

(Second Embodiment)
Next, a second embodiment according to the present invention will be described. FIG. 5 is a longitudinal sectional view showing a portion on the rear end side of the writing instrument 1B according to the second embodiment of the present invention. In the writing instrument 1A according to the first embodiment, the rear end of the communication cylinder 21 does not protrude into the small liquid chamber 16h at the rearmost end, but in the writing instrument 1B according to the second embodiment, the rear end of the communication cylinder 21 is the last end. It protrudes into the small liquid chamber 16h at the end. Here, the portion of the communication tube 21 that protrudes rearward from the partition plate 22g is referred to as a “rear end tube portion 21a”. Since other configurations are the same as those of the first embodiment, the same portions and members as those of the first embodiment are denoted by the same reference numerals in FIG. 5 and description thereof is omitted.

  The rear end cylinder part 21a is provided to inform the user that the ink stored in the liquid storage part 14 has been consumed. In the present embodiment, the shaft cylinder main body 11 is formed of a transparent synthetic resin so that the user can visually recognize the rear end cylinder portion 21a from the outside of the shaft cylinder main body 11 when the ink in the small liquid chamber 16h is consumed. However, it suffices that at least a portion defining the small liquid chamber 16h of the shaft cylinder main body 11 is formed transparent, and the shaft cylinder main body 11 is composed of a part including the part and other parts. May be. In the present embodiment, the communication cylinder 21 is formed of a synthetic resin colored in a fluorescent color. However, when the ink in the small liquid chamber 16h is consumed, the rear end cylinder portion 21a is conspicuous with the ink color. What is necessary is just to form in a different color, or the outer peripheral surface of the rear end cylinder part 21a may be painted, or a label etc. may be put on the outer peripheral surface of the rear end cylinder part 21a. As described above, the ink stored in the liquid storage unit 14 is consumed sequentially from the foremost small liquid chamber 16a to the rearmost small liquid chamber 16h. When the small liquid chamber 16h at the rear end is filled with ink, the user cannot visually recognize the outer peripheral surface of the rear end cylinder portion 21a from the outside of the shaft cylinder main body 11. When the ink in the small liquid chamber 16h at the end is consumed, the user can visually recognize the outer peripheral surface of the rear end cylinder part 21a from the outside of the shaft cylinder main body 11, and thus the user can It can be recognized that the ink has been consumed.

  Conventionally, a writing instrument formed so that the ink in the liquid storage portion 14 can be visually recognized from the outside of the shaft cylinder through the transparent portion by providing a transparent portion on a part of the label to be attached to the outer peripheral surface of the transparent shaft cylinder. Was provided. However, with such a conventional writing instrument, although the ink remaining in the liquid reservoir 14 can be visually recognized from the outside of the shaft tube, it is difficult to recognize whether or not the ink has been consumed. According to the second embodiment, when the ink in the liquid storage part 14 is consumed, the outer peripheral surface of the rear end cylinder part 21 a can be visually recognized from the outside of the shaft cylinder 10, thereby the liquid storage part 14. It is possible to immediately recognize that the ink inside has been consumed.

  A side wall opening 23h is formed on the side wall of the rear end cylinder portion 21a. The ink in the small liquid chamber 16h is smoothly supplied to the liquid guide core 50 by the rear end opening of the rear end cylinder part 21a (that is, the rear end opening of the communication cylinder 21) and the side wall opening part 23h.

(Modification)
Next, a modification of the embodiment of the present invention will be described. In the above-described embodiment, the outer cylinder 2 is attached to the outer periphery of the shaft cylinder 10, and the cap 3 is detachably attached to the outer periphery of the distal end portion of the outer cylinder 2. However, the present invention is limited to this. Alternatively, the cap 63 can be detachably attached to the outer periphery of the tip end portion of the shaft tube 60 without attaching the outer tube 2 to the outer periphery of the shaft tube 60. For example, as in the writing instrument 1C shown in FIG. 6, the shaft tube 60 includes a shaft tube main body 61 and a tip tube 62, and a cap 63 is detachably attached to the outer periphery of the tip portion (the tip tube 62) of the shaft tube 60. You may be comprised so that it may mount | wear. In addition, since structures other than these are the same as those of the first embodiment, the same portions and members as those of the first embodiment are denoted by the same reference numerals in FIG. 6 and description thereof is omitted.

  Next, a modified example of the side wall opening will be described. As shown in FIG. 7, a pair of side wall openings 123 are formed at a position between two adjacent partition plates 22 in the communication tube 21 or between adjacent sealing plates 26 and the partition plates 22 a, respectively. It is also possible to arrange the pair of side wall openings 123 in the communication cylinder 21 so as to face each other. In the liquid supply member 20 </ b> B shown in FIG. 7, one of the pair of side wall openings 123 is formed at the upper part of the communication tube 21, and the other is formed at the lower part of the communication tube 21.

  Next, modified examples of the partition plate and the shaft tube will be described. In the first embodiment, the plurality of inward projections 17 are provided on the inner peripheral surface of the shaft cylinder 10, and the gap G <b> 3 is formed between the inner peripheral surface of the shaft cylinder 10 and the peripheral edge 220 of the partition plate 22. In the present invention, instead of the inward projection 17, a plurality of outward projections projecting radially outward from the periphery of the partition plate are formed, and a gap is formed between the inner peripheral surface of the shaft tube and the periphery of the partition plate. It may be formed.

  Specifically, as shown in FIGS. 8 and 9, for each partition plate 80 of the liquid supply member 20 </ b> C, an outward projecting portion 82 projecting radially outward from the peripheral edge 81 of the partition plate 80 is provided in the circumferential direction. Are formed at equal intervals. Although not particularly shown, the inward projection 17 is eliminated from the shaft tube main body 11 of the first embodiment, and the shaft tube main body is formed to be a continuous inner peripheral surface without unevenness. When the liquid supply member 20C is inserted into the shaft cylinder main body, the outward projecting portion 82, which is a part of the peripheral edge 81 of each partition plate 80, comes into contact with the inner peripheral surface of the shaft cylinder main body, and each partition plate 80 A portion 83 between the two outer protrusions 82 adjacent to each other in the circumferential direction 81 and the inner peripheral surface of the shaft cylinder main body are separated from each other to form a gap. A liquid film for gas-liquid exchange can be formed in this gap.

  In addition, the following can be mentioned as the modification in embodiment which concerns on this invention. For example, in the above embodiment, the application body 18 is a whiteboard marker having a writing tip made of a fiber bundle. However, the present invention is not limited to this, as long as it is a liquid applicator for applying a liquid. The present invention can be implemented as other writing tools such as marking pens, and liquid cosmetic application tools such as mascara and hair dyeing tools.

  Further, in the above embodiment, the liquid holding body that temporarily holds the ink ejected when the internal pressure of the liquid storage portion 14 is increased is formed as the adjuster 30 having the sheet body 33. It can also be set as the structure which does not provide. Further, instead of the adjuster 30, the liquid holding body may be formed of batting or a porous body. In this case, as with the adjuster 30, it is more preferable to increase the density on the back side of the batting or the porous body so that the capillary force on the back side becomes strong. Further, the adjuster 30 in the present embodiment is integrally formed as the liquid supply member 20, but may be formed separately from the communication tube 21 and the partition plate 22.

  Moreover, in the above embodiment, as a gap in which the gas-liquid exchange is performed in the partition plate 22, a gap (for example, the gap G <b> 2) between the inner peripheral surface of the communication tube 21 and the outer periphery of the liquid guide core 50, and the partition plate 22 Although gaps (for example, gap G3) between the peripheral edge 220 and the inner peripheral surface of the shaft cylinder main body 11 are formed, these gaps are only the gap between the peripheral edge 220 of the partition plate 22 and the inner peripheral surface of the shaft cylinder main body 11. be able to. Further, whether or not a gap for gas-liquid exchange is provided only on the peripheral edge 220 and the inner peripheral surface of the shaft cylinder main body 11, and the size of the gap depends on the viscosity and surface tension of the liquid stored in the liquid storage portion 14. What is necessary is just to set suitably suitably.

  Further, the gap between the inner peripheral surface of the communication tube 21 and the outer periphery of the liquid guide core 50 and the flow holes 36 and 37 in the above embodiment are eliminated, and a slit 26a is provided in the sealing plate 26 as shown in FIG. You can also. As a result, a liquid film for gas-liquid exchange is formed in the slit 26a, and when the air pressure of the liquid storage unit 14 increases, the liquid storage unit 14 overflows from the small liquid chamber 16a to the adjuster 30 through the slit 26a. Liquid can flow in.

  As mentioned above, although embodiment and the modification of this invention were demonstrated, this invention is not limited to these, It can add and implement another change suitably.

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Outer cylinder 2a Female thread part 2b Vertical rib 3 Cap 3a Inner cylinder 10 Shaft cylinder 11 Shaft cylinder main body 11a Flange part 11b Male screw part 11c Rear end wall 11d Inner peripheral surface step part 12 Lead cylinder 12a Front end cylinder part 12b Holding Rib 12c Connecting cylinder 12d Base cylinder part 12d1 Annular protrusion 12e Connection step part 14 Liquid storage part 16 Small liquid chambers 16a to 16h Small liquid chamber 17 Inner protrusion 18 Application body 20 Liquid supply member 21 Communication cylinder 21a Rear end cylinder part 22 Partition Plate 22a to 22g Partition plate 23 Side wall opening 23a to 23h Side wall opening 24 Groove 25 Ink groove 26 Encapsulating plate 26a Slit 30 Adjuster 32 Closure plate 32a Notch 33 Sheet material 34 Slit 35 Fixing plate 35a Notch 36 Distribution Hole 37 Flow hole 38 Notch 50 Liquid guide core 60 Shaft tube 61 Shaft tube body 62 Lead tube 63 Cap 80 Partition Plate 81 periphery 82 outward protrusion 123 side wall opening

Claims (7)

A liquid storage part is formed inside, a shaft cylinder provided with an application body at the front end, and
A communication cylinder provided inside the shaft cylinder including the liquid storage section, and a liquid guide core is inserted therein;
An enclosing plate extending radially outward from the outer periphery of the communication tube and enclosing a liquid in the liquid storage portion;
A plurality of partition plates extending radially outward from the outer periphery of the communication tube are formed at a predetermined interval at a position on the rear end side of the communication plate in the communication tube, and the plurality of partition plates The liquid reservoir is partitioned into a plurality of small liquid chambers;
Side wall openings are respectively formed at positions between the two adjacent partition plates or between the adjacent enclosing plate and the partition plate in the communication tube,
A part of the peripheral edge of the partition plate is in contact with the inner peripheral surface of the shaft cylinder, and another part of the peripheral edge of the partition plate is configured to be separated from the inner peripheral surface of the shaft cylinder ,
The liquid applicator characterized in that the side wall openings respectively opened in the small liquid chambers adjacent to each other across the one partition plate are arranged at positions shifted from each other in the circumferential direction in the communication tube. The rear end portion of the communication tube protrudes into a small liquid chamber (hereinafter referred to as “rear end small liquid chamber”) located at the rearmost end in the liquid storage portion,
The portion defining at least the rearmost end small liquid chamber in the shaft cylinder cannot visually recognize the rear end portion of the communication cylinder from the outside when the rear end small liquid chamber is filled with liquid. 2. The liquid applicator according to claim 1 , wherein when the liquid in the chamber is consumed, the rear end portion of the communication tube can be visually recognized from the outside.

A liquid storage part is formed inside, a shaft cylinder provided with an application body at the front end, and
A communication cylinder provided inside the shaft cylinder including the liquid storage section, and a liquid guide core is inserted therein;
An enclosing plate extending radially outward from the outer periphery of the communication tube and enclosing a liquid in the liquid storage portion;
A plurality of partition plates extending radially outward from the outer periphery of the communication tube are formed at a predetermined interval at a position on the rear end side of the communication plate in the communication tube, and the plurality of partition plates The liquid reservoir is partitioned into a plurality of small liquid chambers;
Side wall openings are respectively formed at positions between the two adjacent partition plates or between the adjacent enclosing plate and the partition plate in the communication tube,
A part of the peripheral edge of the partition plate is in contact with the inner peripheral surface of the shaft cylinder, and another part of the peripheral edge of the partition plate is configured to be separated from the inner peripheral surface of the shaft cylinder,
The rear end portion of the communication tube protrudes into a small liquid chamber (hereinafter referred to as “rear end small liquid chamber”) located at the rearmost end in the liquid storage portion,
The portion defining at least the rearmost end small liquid chamber in the shaft cylinder cannot visually recognize the rear end portion of the communication cylinder from the outside when the rear end small liquid chamber is filled with liquid. A liquid applicator characterized in that when the liquid in the chamber is consumed, the rear end portion of the communication tube can be visually recognized from the outside. A pair of the side wall openings are formed at positions between two adjacent partition plates or between the adjacent enclosing plate and the partition plate in the communication tube,
The liquid applicator according to claim 3, wherein the pair of side wall openings are arranged to face each other in the communication tube. A plurality of inward projections projecting radially inward are formed on the inner peripheral surface of the shaft cylinder in the circumferential direction,
Each of the inward projections abuts on the peripheral edge of the partition plate, and a portion between two inner protrusions adjacent in the circumferential direction on the inner peripheral surface of the shaft cylinder is separated from the peripheral edge of the partition plate. The liquid applicator according to any one of claims 1 to 4, wherein the liquid applicator is configured.   6. The liquid applicator according to claim 5, wherein each of the inward protrusions is formed to extend in the axial direction so as to come into contact with the peripheral edges of the plurality of partition plates.   The liquid holding body for holding the liquid overflowing from the liquid storage portion is provided at a position on the front end side of the communication plate in the communication tube. The liquid applicator as described.

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