JP2014100898A - Liquid applicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid applicator capable of preventing entry of air in a chamber storing liquid such as ink, making it difficult to cause shortage of the liquid even in a case of continuous writing, and having excellent writing performance even in a case of upward writing.SOLUTION: A valve liquid applicator A comprises: a barrel 10 storing liquid I inside; an application member 30 provided on a tip end of the barrel; an application-member sliding mechanism 35 causing the application mechanism to make a backward motion or return motion by pressing and opening the application member on/to an application target surface; and a valve mechanism 40 that opens and supplies the liquid in the barrel to the application member when the application member makes the backward motion at strokes equal to or more than certain strokes and a pressing force equal to or higher than a specific resistance load is given to the valve mechanism 40. The application member is provided on the tip end of the barrel by a holding member 20, and the valve mechanism includes a slit valve 45. The valve mechanism opens in such a manner that a rear end portion 31a of the application member having a capillary force passes through the slit valve and enters the barrel, and that the liquid in the barrel is supplied to the application member.

Description

  The present invention relates to a writing instrument such as a marking pen for applying ink, or a cosmetic applicator for applying nail polish, liquid cosmetics, and other liquid applicators for applying other liquids. The present invention relates to a valve-type liquid applicator provided with a valve mechanism for supplying the liquid to a coating member such as a pen core.

2. Description of the Related Art Conventionally, various types of valve-type liquid applicators having a valve mechanism for supplying a liquid such as ink in a shaft cylinder to an application member such as a pen core have been known.
In such a liquid applicator, in order to take a form in which a liquid such as an ink can be easily visually recognized, ink or the like is directly filled in a shaft cylinder that becomes a liquid storage tube or the like, and in order to prevent a backflow or the like as necessary. Although it is necessary to take the form of a follower (backflow prevention body), it is necessary for the liquid applicator of such a form to prevent the direct current of the liquid from the front-end | tip of an application member.

Conventionally, as a micro-stroke valve-type liquid applicator applied to a writing instrument that prevents direct current of liquid, for example,
1) A valve body having an ink inlet on the peripheral surface, a rod-like valve supported concentrically within the valve body and mounted in a freely movable manner, and this valve is fitted and attached to the valve body. In a writing instrument in which a writing chip is attached to the tip of a main body portion that stores ink via an ink outflow control mechanism that includes a coil spring that is biased in the valve valve direction, the spring pressure of the coil spring is measured at the time of writing. The pressure is approximately the same as the writing pressure, and either one of the valve or the valve body is provided with a restricting portion that regulates the valve opening amount with respect to the valve valve, and the length of the valve on the tip side is the valve valve. A writing instrument characterized in that the length of the abutting valve is made to abut against the tip of the valve, while the length of the abutting valve is abutted or fitted and connected to the tip of the valve (see, for example, Patent Document 1),

2) A shaft cylinder that contains ink, a pen core that protrudes from the tip of the cylinder, and a pen core that moves back and forth by pressing and releasing the pen tip of the pen core to the writing target surface. A pen-sliding mechanism that enables the ink to be retreated, and when the pen core is retracted more than a certain stroke and a pressing force exceeding a specific resistance load is applied, the valve is opened to remove ink in the container. In a valve-type writing instrument having a valve mechanism that circulates toward the pen core, elasticity that increases the resistance load against the pen core press during the stroke until the valve opens. A writing instrument (see, for example, Patent Document 2), characterized in that a dummy pumping portion made of a member is provided at the tip of the shaft tube.
3) In an ink tank in which ink supplied to the ink ejection mechanism is stored in a free state, a high-viscosity fluid that moves while adhering to the ink interface as the ink is consumed is brought into circumferential contact with the inner wall of the ink tank. And an inner wall of the ink tank is inclined so that an inner cross-sectional area corresponding to a position where an ink interface is formed gradually expands toward a connection port to the ink ejection mechanism. An ink tank (for example, see Patent Document 3) is known.

However, in the valve-type writing instrument of this structure, when it is turned upward, an ink drop occurs and writing becomes impossible. To solve this problem, for example, it has a writing unit made of a pen body having capillary force, the ink storage chamber is filled with ink, the volume of the ink storage chamber is variable, and the pen body and the ink Is a writing instrument divided by a valve body that can be opened and closed, and is a writing instrument characterized in that a capillary force is applied to the ink storage chamber side of the opening of the valve body (see, for example, Patent Document 4). As a result, ink drops do not occur even when facing upward.
However, the above-mentioned Patent Document 4 has a complicated valve structure, and further improvement such as a slight deterioration in the fluidity of ink is eagerly desired when writing continuously.

JP-A-6-286386 (claims, FIG. 1, FIG. 2, etc.) JP 2008-265203 A (Claims, FIG. 2 etc.) Japanese Patent Laid-Open No. 10-236060 (Claims, FIG. 1 etc.) Japanese Patent Laying-Open No. 2008-87422 (Claims, FIG. 1, etc.)

  The present invention has been made in view of the above-described problems of the prior art, and is intended to solve this problem. Air can be prevented from entering a room containing a liquid such as ink. It is an object of the present invention to provide a liquid applicator that is difficult to cause liquid breakage and has excellent writing performance or coating performance even when writing upward.

  As a result of intensive studies to solve the above-described conventional problems, the present inventors have found that a shaft cylinder that stores a liquid such as ink directly or via a liquid tank, and a coating provided at the tip of the shaft cylinder The member, a valve mechanism provided between the shaft cylinder and the coating member, and the coating member is moved back and forth by pressing and releasing the coating member against the surface to be coated, and the coating is performed by pressing the coating member. A valve-type liquid applicator for retracting the rear end of the member to open the valve mechanism and supplying the liquid in the shaft cylinder to the application member, wherein the application member is held at the tip of the shaft cylinder by a holding member. In addition, the present inventors have found that the above-described liquid applicator can be obtained by making the valve mechanism a valve mechanism having a specific structure, thereby completing the present invention.

That is, the liquid applicator of the present invention exists in the following (1) to (6).
(1) A shaft cylinder that contains liquid therein, an application member provided at the tip of the shaft cylinder, and an application member slide that moves back and returns by applying and releasing the application member to the application target surface. And a valve mechanism that opens when the application member moves backward by a certain stroke or more and a pressing force exceeding a specific resistance load is applied to supply the liquid in the shaft cylinder to the application member; The applicator member is provided at the tip of the shaft cylinder by a holding member, the valve mechanism has a slit valve, and the valve mechanism has a capillary force. A liquid applicator having a structure in which a rear end portion of an applicator member passes through the slit valve and enters the shaft cylinder to supply the liquid in the shaft cylinder to the applicator member.
(2) The valve mechanism incorporates a cylindrical joint member provided in the shaft cylinder, and a valve seat composed of a slit valve and an elastic material in the joint member, and an application member on the outer periphery of the joint member. An elastic member that urges the provided holding member toward the front, and when the application member is retracted more than the stroke, the rear end of the application member enters the slit valve, and the slit valve is opened. The liquid applicator according to (1), wherein the slit valve is closed by returning the member.
(3) A relay core having capillary force is provided at the rear end portion of the application member, and when the valve mechanism is opened, the rear end portion of the relay core passes through the slit valve and enters the shaft cylinder, The liquid applicator according to the above (1) or (2), wherein the liquid in the shaft cylinder is supplied to the application member via the relay core.
(4) The liquid applicator according to (2) or (3), wherein the holding member is integrally formed with the valve seat.
(5) In any one of the above (2) to (4), the valve seat made of an elastic material has a durometer A hardness specified in JIS K 6253-3 of less than 70 °. The liquid applicator as described.
(6) The liquid applicator according to any one of (1) to (5) above, wherein a liquid tank made of a flexible member is accommodated in the shaft tube.

  According to the present invention, it is possible to prevent air from entering a room containing a liquid such as ink, and it is difficult for ink or the like to run out even when continuously written or applied. A liquid applicator having writing performance or application performance is provided.

(A) is a longitudinal cross-sectional view of the liquid applicator which shows an example of embodiment of this invention, (b) is the elements on larger scale which show the principal part before the action | operation of the liquid applicator of (a). (A) is a front view showing an example of a slit valve used in the liquid applicator of FIG. 1, (b) is a cross-sectional view taken along line BB of (a), (c) is a right side view, and (d) is It is a perspective view. (A) is a longitudinal cross-sectional view which shows an example of the operation state of the liquid applicator of FIG. 1, (b) is the elements on larger scale which show the principal part of the liquid applicator of (a). It is a longitudinal cross-sectional view of the liquid applicator which shows the other example of embodiment of this invention. (A) And (b) is the elements on larger scale which show the principal part of the liquid applicator before the operation | movement which shows the other example of embodiment of this invention, and an operation state.

Embodiments of the present invention will be described below in detail with reference to the drawings.
1-3 is each drawing of the liquid applicator which shows an example of embodiment of this invention.
The liquid applicator A of the present embodiment is applied to a marking pen type valve-type writing instrument, and as shown in FIGS. 1 and 3, a shaft cylinder 10 that contains a liquid I such as ink, An application member 30 comprising a pen core provided at the tip of the shaft tube 10 by the holding member 20 and an application member slide on which the application member 30 is moved back and forth by pressing and releasing the application member 30 against the application target surface M. When the moving mechanism 35 and the coating member 30 are moved backward by a predetermined stroke or more and a pressing force exceeding a specific resistance load is applied, the valve I is opened, and the liquid I in the shaft tube 10 is applied to the coating member 30. And a valve mechanism 40 to be supplied.

The shaft cylinder 10 is formed of, for example, a thermoplastic resin, a thermosetting resin, glass, or the like, and includes a cylindrical rear shaft 11 that directly stores ink I for writing instruments such as water-based ink and oil-based ink, and a pen. It has a tip shaft 15 to which a holding member (cuticle) 20 serving as a guide member for holding the coating member 30 made of a core is attached.
The rear shaft 11 is molded into a cylindrical body using, for example, a synthetic resin made of PP or the like, and functions as a writing instrument body. The entire rear shaft 11 and the front shaft 15 are formed to be opaque or transparent (and translucent), but any of them may be adopted from the viewpoint of appearance and practical use. In the present embodiment, the entire rear shaft 11 is formed so that the remaining amount of ink can be visually recognized. Further, in this embodiment, the front shaft 15 is fixed to the front end opening 12 of the rear shaft 11 by fitting or screwing.

  As shown in FIG. 1, a follower (following body) 13 that follows as ink is consumed during writing is provided at the rear part of the writing instrument ink I accommodated in the shaft tube 10, and the rear side communicates with the outside air. It is in a state to do. As this follower (follower) 13, a non-volatile or hardly volatile fluid such as polybutene or liquid paraffin can be used as a main component. In this embodiment, the follower 13 is composed of mineral oil and a thickener. Yes. A tail plug having a communication hole communicating with the outside air may be attached to the rear end opening of the shaft tube 10.

  The front shaft 15 has a cylindrical large-diameter portion 17 having a flange portion 16 fitted to the opening 12 of the rear shaft 11 on the rear side, a cylindrical medium-diameter portion 18 on the front side, and an application member made of a pen core. And a cylindrical small-diameter portion 19 that holds the holding member 20 to which 30 is attached, and is formed of, for example, a synthetic resin made of PP or the like.

A holding member (cutlery) 20 that holds the coating member 30 made of a pen core includes a cylindrical portion 21 that fits and holds the coating member 30 made of a pen core, a flange portion 22 on the outer periphery, and a rear small diameter that has a small rear end side. A through hole 25 for inserting a rear end portion of the coating member 30 made of a pen core is formed in the central portion of the main body portion 24.
In the present embodiment, the holding member 20 is made of polypropylene. However, when integrally formed with the valve seat 50, for example, a durometer A hardness defined by JIS K 6253-3 such as a thermoplastic elastomer or silicone rubber is 70 °. It is preferable to use a material having a durometer A hardness of 30 to 40 °.

The coating member 30 made of a pen core is, for example, natural fiber, animal hair fiber, polyacetal resin, polyethylene resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, Parallel fiber bundles made of one or two or more combinations such as polycarbonate resins, polyether resins, polyphenylene resins, fiber bundles such as felt, or fiber cores made by processing these fiber bundles with resin, or various A porous body (sintered core) obtained by sintering a plastic powder or the like, and the shape thereof is, for example, a pen core having a substantially cylindrical shape with a rounded tip as in this embodiment. Can be mentioned.
The coating member 30 made of the pen core is fitted and held by a holding member 20 that is slidably mounted in the front shaft 15, and the tip end side of the pen core is exposed from the small diameter portion 18 and the holding member 20. It has become.

In the present embodiment, a relay core 31 having a capillary force is provided at the rear end portion of the application member 30 so as to come into contact therewith. The rear end side of the relay core 31 has a tapered portion 31a so as to easily enter a slit valve 45 of a valve mechanism 40 described later. The front side of the relay core 31 is fitted and held in the through hole 25 of the holding member 20.
The relay core 31 can be made of a material having a capillary force, and is the same material as the application member 30, for example, a fiber core obtained by processing a fiber bundle or resin processing these fiber bundles, or various plastics. It can be composed of a porous body (sintered core) obtained by sintering powder or the like. Preferably, the capillary force of the relay core 31 can efficiently distribute the liquid in the shaft tube 10 to the application member 30. In view of this, it is desirable that the coating member 30 is the same as or smaller than the coating member 30.

The valve mechanism 40 is provided between the shaft cylinder 10 and the coating member 30 made of a pen core, and includes a cylindrical joint member 41 provided in the front shaft 15 of the shaft cylinder 10, and the joint member 41. From a coil-shaped spring member that incorporates a slit valve 45 and a valve seat 50 made of an elastic material, and biases the holding member 20 having the application member 30 attached to the outer periphery of the joint member 41 toward the front. And an elastic member 42.
The joint member 41 includes a cylindrical portion 41a that houses the slit valve 45 and the valve seat 50, and a fixing portion 41b that is fixed in the large-diameter portion 17 of the tip shaft 15, and an outer periphery on the distal end side of the fixing portion 41a. The surface 41c serves as a spring receiver that receives the rear end portion of the elastic member 42 made of a coiled spring member. Further, the distal end portion of the elastic member 42 is fitted on the outer periphery of the flange portion 22 of the holding member 20 to urge the holding member 20 that guides the application member 30 toward the front side and bias it.

The slit valve 45 is a cylindrical body having a bottomed shape, and, as shown in FIGS. 2A to 2D, a flange portion 46 for mounting in the joint member 41 on the application member 30 side, and a cylindrical shape The closed portion 48 that closes the tubular portion 47 is formed, and a dome-shaped slit portion 49 is formed at the center of the closed portion 48.
The slit portion 49 is formed with a communicating portion 49 a formed of a linear slit, and the slit 49 a is normally closed by the elastic (compressive) force of the slit valve 45.
The material of the slit valve 45 is not particularly limited as long as it has storage stability, durability, and liquid impermeability with respect to the liquid I contained therein. Polyvinyl alcohol, ethylene / vinyl alcohol copolymer resin , Synthetic resins such as polyacrylonitrile, nylon, cellophane, polyethylene terephthalate, polycarbonate, polystyrene, polyvinylidene chloride, polyvinyl chloride, natural rubber, isoprene rubber, butadiene rubber, acrylonitrile butadiene rubber, 1,2-polybutadiene rubber, styrene Butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, epichlorohydrin rubber, polysulfide rubber, silicone rubber, fluorine rubber, urethane rubber, etc. Rubber, include thermoplastic elastomers, it can be produced by such conventional injection molding and vulcanization. Preferably, it is desirable to use a material having rubber elasticity (viscoelasticity). In this embodiment, a slit valve made of butyl rubber is used.
In addition, although the said communication part was formed with the linear slit 49a, the structure which formed multiple crosses and radial slits and slits, and made each slit cross | intersect at the same location, circular hole shape, rectangular hole It may be a shape. Preferably, the linear or cross-shaped slit is desirable.

The valve seat 50 is made of an elastic material and is accommodated on the front side in the joint member 41.
A washer member 55 is interposed between the valve seat 50 and the flange portion 46 of the slit valve 45. In the present embodiment, a flexible portion 60 is provided on the front side of the valve seat 50.
The flexible portion 60 includes a film-like member 61 that surrounds and engages the rear side surface portion of the relay core 31a that is in contact with the rear portion of the pen core 20 (the rear side surface portion of the relay core 31a is formed with a step or a groove. The outer peripheral part of the valve seat 50 and the outer peripheral part of the film-like member 61 are connected and integrally formed.

The integral valve seat 50 and flexible portion 60 can be made of an elastic material, and it is preferable to use one having a durometer A hardness of less than 70 ° as defined in JIS K 6253-3. Preferably, the durometer A hardness is 30 to 40 °. Specific examples of the elastic material that can be used in the durometer A hardness range include the same resin as the holding member 20, such as rubber, thermoplastic elastomer, and silicone. The flexure 60 has a durometer A hardness of 40 °.
As will be described later, the flexible portion 60 increases the resistance load against the pressing of the application member 30 according to the backward movement of the application member 30 during the stroke until the slit valve 45 is opened. .

  In the liquid applicator A of the present embodiment configured as described above, first, as shown in FIG. 1, it is before pressing the tip of the application member 30 serving as a pen core against a paper surface that is a writing target surface in the initial state. No pressing force is applied to the application member 30. The application member 30 does not retreat, and the slit valve 45 is closed. And as shown in FIG. 3, the front-end | tip of the application member 30 is pressed on the paper surface M which is a writing object surface (at the time of a stroke start). When the pressing force is gradually applied, the holding member 20 provided with the application member 30 moves backward, and the application member 30 moves backward against the elastic force of the flexible portion 60. In this case, since the flexible portion 60 is locked to the outer peripheral surface of the rear small-diameter portion 23 of the holding member 20, the flexible portion 60 falls down rearward due to elastic deformation and generates an elastic force. When the application member 30 further moves backward beyond the pushing stroke, the rear end portion of the rear portion 31a of the relay core 31 moves rearward against the elastic force of the elastic member 42 and passes through the slit portion 49a of the slit valve 45. The ink enters the ink I in the shaft cylinder 10 and opens (from the end of the stroke to the start of opening). As a result, the liquid I in the shaft tube 10 can be efficiently supplied to the coating member 30 through the relay core 31 having a capillary force without flowing backward. When the pressing of the application member 30 is released (released), the holding member 20 attached with the application member 30 returns to the original position by the elastic force of the elastic member 42 and the return of the elastic deformation of the flexible portion 60. It will return to. At this time, the rear portion 31a of the relay core 31 is also returned into the joint member 41, and the slit portion 49 of the slit valve 45 is closed (closed) by its own elastic force.

  In the writing instrument A of the actual embodiment, the application member 30 is provided at the tip of the shaft tube 10 by the holding member 20, and the valve mechanism 40 is composed of the slit valve 45 having excellent airtightness, so that it becomes an ink tank. Since the liquid can be supplied from the shaft cylinder 10 to the coating member 30 in a sealed state from the outside, it is possible to prevent air from entering the room containing the ink, and it is difficult to cause ink to run out even when writing continuously. A liquid applicator having excellent writing performance can be obtained even when writing upward.

Next, FIG.4 and FIG.5 shows other embodiment of the liquid applicator of this invention, respectively. 4 and 5, the same structure as the writing instrument A of the above embodiment (FIGS. 1 to 3) shows the same reference numeral, and the description thereof is omitted.
The writing instrument B of the embodiment shown in FIG. 5 is the above-described embodiment (FIGS. 1 to 3) in that the flexible container 14 such as a pouch is used without directly storing the ink liquid in the shaft tube 10. ) And writing instrument A.
The flexible container 14 may be a flexible container that can be deformed from the standpoint of liquid filling efficiency, the ability to visually recognize the remaining amount according to the degree of deformation, and the high degree of freedom in shape. Although not particularly limited, a laminate film having a surface layer made of polyethylene, polypropylene, polyethylene terephthalate, nylon, cellophane, paper, cloth, or nonwoven fabric is fused to make it easier to manufacture and to further increase the strength. What consists of laminated pouches, such as a 3-way seal bag, a 2-way seal bag, or a pillow bag shape, is preferable. Furthermore, the laminate film may have a barrier layer made of an aluminum foil, polyvinylidene chloride, an ethylene-vinyl alcohol copolymer, aluminum, or a silica deposited film.
According to the writing instrument B of this embodiment, the same effect as the writing instrument A of the said embodiment (FIGS. 1-3) can be exhibited.

  The writing instrument C of the embodiment shown in FIGS. 5A and 5B does not constitute the flexible portion 60, and is a cylindrical valve seat 50 that is provided with an application member 30 on the inner peripheral surface of the valve seat 50. The rear small diameter portion 23 of the member 20 is slid. According to this writing instrument C, the same effect as the writing instrument A of the said embodiment (FIGS. 1-3) can be exhibited.

The present invention is not limited to the above-described embodiment, and can be modified into various forms without departing from the gist of the present invention.
In the above embodiment, the writing instrument using the writing instrument ink as the liquid applicator has been described in detail. However, the ink is made of nail polish, liquid cosmetic, etc., and the pen core serving as the application member is composed of a porous body such as a sponge. It is good also as what apply | coats generally the cosmetics used as the application body, and other liquids.

In the writing instrument A of the above embodiment, the valve seat 50 and the flexible portion 60 are integrally formed. However, the holding member 20 may be integrally formed, and these three parts are separately provided. It may be formed on the body.
Furthermore, in the writing instrument A of the above-described embodiment, the application member 30 serving as the pen core and the relay core 31 are configured separately, but may be formed integrally.
In the above embodiment, liquid (ink) is filled directly into the shaft tube 10 or into the flexible container 14, but a refill type of liquid containing a liquid-filled refill (liquid containing tube) that does not have flexibility. It may be a writing instrument.

  Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[Example 1]
(Configuration of the liquid applicator: based on FIGS. 1 to 3)
Configuration of each member:
Application member (pen core) 30: acrylic fiber core, porosity 72%, length 5 mm, outer diameter φ: 4 mm, tip is processed into a convex curved surface relay core 31: made of acrylic, length 10 mm, outer diameter φ 1.4 mm
Holding member 20: polypropylene valve seat 50, flexible part 60: butyl rubber, durometer A hardness: 40 °
Elastic member (spring) 42: stainless steel shaft cylinder 10, tip 15: polypropylene slit valve 45: butyl rubber, size: total length 4 mm, outer diameter φ5 mm, inner diameter φ4 mm, dome diameter: φ2 mm, slit length 1 mm
(Ink composition)
As the ink I, a commercially available oil-based ink was used.

  When continuous writing and upward writing were performed using the liquid applicator of Example 1 according to the present invention configured as described above, it was difficult to run out of ink even with continuous writing or the like, especially writing upward or the like. However, it was confirmed that this was a liquid applicator excellent in writing performance with no ink running out, particularly effective, and no air mixing. Furthermore, it was confirmed that the elastic force for closing the valve is sufficient, and that it is possible to reliably prevent ink leakage and drooping.

  The liquid applicator of the present invention can be suitably applied to underline pens, paint markers, oily markers, writing tools of the type called water-based markers, cosmetics such as nail polish, and liquid cosmetics.

A liquid applicator 10 shaft cylinder 11 rear shaft 15 front shaft 20 holding member 30 coating member (pen core)
40 Valve mechanism 45 Slit valve 50 Valve seat

Claims (6)

  A shaft cylinder that contains liquid therein, an application member provided at the tip of the shaft cylinder, and an application member sliding mechanism in which the application member moves back and forth by pressing and releasing the application member against the application target surface; A valve mechanism for opening the valve when the application member moves backward more than a predetermined stroke and a pressing force exceeding a specific resistance load is applied, and supplies the liquid in the shaft cylinder to the application member A liquid applicator of the above type, wherein the applicator member is provided at the tip of the shaft cylinder by a holding member, the valve mechanism has a slit valve, and the valve mechanism is opened by a captive force of the applicator member A liquid applicator characterized by having a structure in which a rear end portion passes through the slit valve and enters the shaft cylinder to supply the liquid in the shaft cylinder to the application member.   The valve mechanism includes a cylindrical joint member provided in the shaft cylinder, a valve seat made of a slit valve and an elastic material in the joint member, and a coating member provided on the outer periphery of the joint member. And an elastic member that urges the member forward, and when the application member is retracted more than a stroke, the rear end of the application member enters the slit valve, the slit valve is opened, and the application member returns. The liquid applicator according to claim 1, wherein the slit valve is closed.   A relay core having a capillary force is provided at the rear end of the coating member, and when the valve mechanism is opened, the rear end of the relay core passes through the slit valve and enters the shaft cylinder, The liquid applicator according to claim 1, wherein the liquid in the shaft cylinder is supplied to the applicator member through the interposer.   The liquid applicator according to claim 2 or 3, wherein the holding member is integrally formed with the valve seat.   The liquid applicator according to any one of claims 2 to 4, wherein the valve seat made of an elastic material has a durometer A hardness defined in JIS K 6253-3 of less than 70 °.   The liquid applicator according to claim 1, wherein a liquid tank made of a flexible member is accommodated in the shaft tube.

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