JP4739557B2 - Writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing instrument capable of adjusting the flow rate of ink supplied to a pen body.
[0002]
[Prior art]
Conventionally, this type of writing instrument has an ink flow rate adjusting mechanism that opens and closes the valve body by pressing the pen body against the writing surface, as disclosed in, for example, Japanese Utility Model Publication No. 59-68984. There is something.
However, in the above conventional writing instruments, the pen body is repeatedly pressed against the writing surface, so the front end of the pen body is deformed, or the ink suddenly flows out during the pressing operation and the writing surface is soiled. Had problems.
Therefore, it is conceivable that a push button is provided on the outer surface of the shaft cylinder and the valve is opened and closed by the push button. However, there is a concern that ink leaks from the periphery of the push button, and the sealing structure is devised. Cost.
[0003]
Further, when a multicolor writing instrument such as that disclosed in Japanese Patent Laid-Open No. 63-302096 is configured using the conventional ink flow rate adjusting mechanism, a plurality of pen bodies are arranged in parallel. It is difficult to press and operate only the pen body.
Therefore, the multi-color writing instrument cannot use the ink flow rate adjusting mechanism, and when writing for a long time, any of the writing lines of a plurality of colors is blurred due to the uneven pressure of the writing tip. The current situation is that it has a problem that
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described conventional circumstances, and the intended process is that there is no risk of ink leakage, the ink flow rate can be easily adjusted, and furthermore, when a multicolor writing instrument is configured. It is an object of the present invention to provide a writing instrument that can write each color in a uniform density without blurring, and can write only a selected color deeply.
[0005]
[Means for Solving the Problems]
The technical means of the present invention for solving the above problems is a writing instrument including an ink flow rate adjusting mechanism for adjusting a flow rate of ink supplied from an ink tank to a pen body, wherein the ink flow rate adjusting mechanism includes a shaft cylinder peripheral wall. The elastic wall portion is configured to open and close the valve member in the shaft cylinder when the elastic wall portion is pushed , and a plurality of the ink tanks are provided, and each of the plurality of ink tanks corresponds. A plurality of ink flow rate adjusting mechanisms are provided, and the flow rate of ink supplied to the pen body can be adjusted for each selected ink tank .
[0006]
Here, the ink flow rate adjusting mechanism that opens and closes the valve member in the shaft cylinder when the elastic wall portion is pushed includes, as a specific example, a valve member biased to close the ink flow path, And an operation member that pushes the valve member in the opening direction by being pushed by the inner surface of the elastic wall portion.
[0007]
According to the above technical means, the ink discharged from the ink tank is adjusted in flow rate by the ink flow rate adjusting mechanism and supplied to the pen body. The flow rate adjusting operation is performed in a state where the sealing structure is maintained in order to open and close the valve member in the shaft cylinder by pressing the elastic wall portion.
Moreover, only the ink in the selected ink tank can be supplied to the pen body by pressing the elastic wall portion of the ink flow rate adjusting mechanism corresponding to the selected ink tank.
[0008]
Further, in order to further improve the operability during the flow rate adjustment, the elastic wall portion is disposed at a portion to be gripped in the outer peripheral wall of the shaft tube.
Here, the gripped portion means a portion that is often gripped in a normal writing posture, and includes the front side of the outer peripheral wall of the shaft tube.
[0009]
Furthermore, in order to ensure the sealing performance of the ink flow rate adjusting mechanism, the elastic wall portion is formed by double molding.
[0010]
If the ink tank is configured to be replaceable, the ink flow rate adjusting mechanism and the pen body can be effectively used for a long time without being discarded.
[0012]
Furthermore, if the plurality of ink tanks are filled with different colors of ink, the ink flow rate adjustment mechanism corresponding to the selected color is operated, so that only the selected color is adjusted and supplied to the pen body. it can.
[0013]
Also, if the rear end side of the pen body is partitioned corresponding to each ink tank and the front end side is formed integrally, a plurality of colors of ink are ejected from the writing front end portion while gradually mixing on the front end side of the pen body. Is done.
In addition, if the rear end side of the pen body is partitioned corresponding to the ink tanks, and the front end side is separated corresponding to the ink tanks, the inks of a plurality of colors are not mixed. It is discharged from the writing tip.
[0014]
If the pen body is composed of a brush pen body, ink can be easily supplied to the brush pen body made of a flexible material.
[0015]
Further, in the writing instrument including an ink flow rate adjustment mechanism for adjusting a flow rate of ink supplied from the ink tank to the pen body, the ink flow rate adjustment mechanism has an elastic wall portion at a rear end portion of the shaft cylinder, and the elastic wall The valve member in the shaft cylinder is opened and closed by pressing the part.
Here, having the elastic wall portion at the rear end portion of the shaft tube means that the rear end portion of the shaft tube is made of synthetic rubber so that the rear end portion of the shaft tube is elastically depressed into the shaft tube when pressed from the outside. This means that the elastic wall portion does not include a well-known bellows-like configuration.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a writing instrument according to the present invention.
The writing instrument A constitutes the shaft cylinder 1 by an ink tank 10 filled with a pigment-type water-based ink and an ink flow rate adjusting mechanism 30 that adjusts the flow rate of ink ejected from the ink tank 10, and the shaft A direct liquid writing instrument that includes a pen body 20 at the front end of the cylinder 1 and is configured to open and close the valve member 33 in the shaft cylinder 1 by pressing an elastic wall portion 31b formed on the outer peripheral wall of the shaft cylinder 1. It is.
[0017]
In the writing instrument A of the present embodiment, a plurality of ink tanks 10 (three in the illustrated example) are provided, and a plurality of the ink flow rate adjusting mechanisms 30 are provided corresponding to each of the plurality of ink tanks 10. A particularly preferable example is shown in which the ink tank 10 is filled with inks of different colors so that the flow rate of ink supplied to the pen body 20 can be adjusted for each selected color.
[0018]
Each of the ink tanks 10 has a substantially fan-shaped cylindrical shape with a front end opened and a rear end closed. Each ink tank 10 is connected to a valve chamber constituting body 31 of an ink flow rate adjusting mechanism 30 (to be described later) via a joint member 11, so that a plurality of ink tanks 10 are bundled around the shaft center and constitute the rear side of the shaft cylinder 1. ing.
Each ink tank 10 is filled with pigment ink, and a stirrer 10a for stirring the pigment in the pigment ink is housed in a freely movable manner in the axial direction.
[0019]
Each ink tank 10 may be detachably connected to the ink flow rate adjusting mechanism 30. In this case, a film to be pierced by the rear end portion of the joint member 11 may be formed on the front end side of the inner peripheral surface of the ink tank 10. According to this configuration, only the ink tank 10 that has been quickly depleted of ink is replaced with a new ink tank 10 that is filled with ink, or an arbitrary ink tank 10 is replaced with an ink tank 10 that is filled with ink of a different color. Can be exchanged.
[0020]
The joint member 11 has a substantially cylindrical shape, and has a valve seat 11a that is opened and closed by the stirrer 10a on the inner peripheral surface thereof. Each joint member 11 provided for each ink tank 10 has its front end connected to the valve chamber constituting body 31 of the ink flow rate adjusting mechanism 30.
The ink flow rate adjusting mechanism 30 includes a valve member 33 biased so as to close the ink flow path and an operation member 34 that moves the valve member 33 so as to open the valve member 33. By constructing three valve chambers 3 in the valve chamber constituting body 31, a plurality of configurations corresponding to each of the three ink tanks 10, 10, 10 are provided.
The plurality of ink flow rate adjustment mechanisms 30 are arranged on the front side of the shaft tube 1 so that the elastic wall portion 31b on the outer periphery of the valve chamber constituting body 31 is disposed on the gripped portion of the outer wall of the shaft tube 1. Is provided.
[0022]
The valve chamber structure 31 is integrally formed by double molding, and a main body 31a that is primarily molded from a hard resin material such as polypropylene, and an elastic wall that is secondarily molded from a soft resin material such as a thermoplastic elastomer resin. Part 31b.
[0023]
The main body 31a divides the cylindrical body into three equal parts in the circumferential direction to form three valve chambers 3, and a window portion 31a1 for fitting the elastic wall portion 31b to the peripheral wall of the partitioned valve chamber 3 Forming.
And the elastic wall part 31b is shape | molded by the substantially cylinder shape which covers the main body 31a, The peripheral wall is fitted by each said window part 31a1 of the main body 31a.
[0024]
The valve member 33 is a substantially shaft-like integral member formed so as to move in the axial direction within each valve chamber 3, and the stirrer 10 a and the joint member 11 are pushed by pushing the stirrer 10 a toward the rear end side. A push shaft portion 33a is formed to open the valve seat 11a, and a valve portion 33b is formed on the front end side to open and close a rear end valve seat portion 41a of a pen body holding cover 40 which will be described later. Has been.
[0025]
Further, the valve member 33 is formed with an ink passage opening / closing shaft portion 33d for opening and closing an ink passage 43 in a pen body holding cover 40, which will be described later, on the front end side of the valve portion 33b. A convex portion 33c protruding in the centrifugal direction is formed between the valve portion 33b.
[0026]
The valve member 33 slides in the axial direction while being guided in the main body 31a of the valve chamber constituting body 31 while being urged forward by a spring 32 provided around the push shaft portion 33a. It is assembled as follows.
[0027]
The operation member 34 extends forward along the elastic wall portion 31b from the fitting tube portion 34a fitted on the inner peripheral surface of the joint member 11 on the rear end side, and the front end portion of the fitting tube portion 34a. The rocking piece 34b is formed integrally with a triangular protrusion 34c protruding in the centripetal direction of the shaft cylinder at the front end of the rocking piece 34b, and the elastic wall 31b is pushed from the outside to be elastically deformed. It is operated by doing.
[0028]
That is, when the elastic wall 31b is pushed from the outside, the swing piece 34b is elastically bent by the elastically deformed elastic wall 31b, and the protrusion 34c at the front end of the swing piece 34b is Move in centripetal direction. At this time, the inclined surface 34c1 of the protrusion 34c is slidably contacted with the convex portion 33c of the valve member 33, so that the valve member 33 is pushed backward (upward in FIG. 1) (see FIG. 8).
[0029]
The pen body holding cover 40 is integrally formed from the three ink introducing portions 41, 41, 41 on the rear end side and the three pen body holding portions 42, 42, 42 on the front end side. The front end is fitted.
[0030]
Each ink introducing portion 41 is formed in a cylindrical shape that can be fitted into each valve chamber 3 corresponding to each of the above-described three valve chambers 3, 3, and 3. A rear end valve seat portion 41a that is opened and closed by the portion 33b is formed.
[0031]
Each pen body holding part 42 is formed in a cylindrical shape into which a pen body 20 described later can be fitted, and has a partition wall 42a between adjacent pen body holding parts 42 (see FIG. 4A). .
[0032]
Each ink introduction part 41 and each pen body holding part 42 communicate with each other by an ink passage 43 extending from the inner wall surface on the front end side of the ink introduction part 41 to the rear end face of the pen body holding part 42 (FIGS. 1 and 3). reference).
[0033]
Each pen body 20 is fitted in each pen body holding portion 42 of the pen body holding cover 40 so that the side surface of the writing tip portion 20a contacts the side surface of the writing tip portion 20a of the adjacent pen body 20. Moreover, the writing front-end | tip part 20a is formed wide (refer Fig.4 (a)).
Then, the pen body holding cover 40 holds the three pen bodies 20, 20, 20 integrally by bringing the writing tip portions 20 a into contact with each other (see FIG. 4B).
In addition, the code | symbol 70 in a figure is a cap fitted to the front-end part outer periphery of the valve chamber structure 31 so that the pen bodies 20, 20, and 20 may be protected, and removed at the time of use.
[0034]
According to the writing instrument A having the above configuration, since the ink flow rate adjusting mechanism 30 has a sealed structure that is operated by elastically deforming the elastic wall portion 31b, there is no fear of ink leakage, and the elastic wall portion 31b is externally provided. The flow rate can be easily adjusted by pressing.
In addition, each pen body 20 is supplied with inks of different colors from the rear, and these inks are ejected from the three adjacent writing tip portions 20a, 20a, 20a. When the ink is ejected, adjacent inks are mixed on the front end side (abutting part) of the writing tip portions 20a, 20a. Therefore, the writing lines L written on the writing surface such as a paper surface are adjacent to different colored inks. It becomes a gradation-like line slightly mixed in the vicinity of the boundary (see FIG. 7).
In addition, when any color is faded by writing for a long time or when only one of the colors is to be emphasized darkly, the ink flow rate adjusting mechanism 30 corresponding to the color is set to the elastic wall 31b. If operated by pressing, only the selected color can be supplied to the pen body 20 (see FIG. 8).
[0035]
Note that the three pen bodies 20, 20, and 20 may be replaced with the pen body 50 having the form shown in FIG. 5A or the pen body 80 having the form shown in FIG. 6A.
The pen body 50 shown in FIG. 5 (a) is integrally formed by joining the three pen bodies 20, 20, and 20 of the above-described form with the wide writing front end portions 20a, and has two slit portions on the rear end side. 50a and 50a are fitted in the pen body holding portion 42a so as to fit the partition walls 42a and 42a of the pen body holding cover 40 (see FIG. 5B).
[0036]
Moreover, the pen body 80 shown to Fig.6 (a) is formed in the substantially same width | variety from the rear end to the front end, and is fitted by the pen body holding cover 40 in the state partitioned off by the partition walls 42a and 42a ( (Refer FIG.6 (b)). That is, the plurality of pen bodies 80 are separated from the rear end side corresponding to the ink tanks 10 and the front end side is separated from the ink tanks 10 while being fitted to the pen body holding cover 40. Has been.
Therefore, according to the pen body 80, inks of a plurality of colors are ejected from the writing tip 80a without being mixed.
[0037]
Moreover, although the three-color writing tool is illustrated in the writing tool A, a single-color, or two-color or a plurality of four-color or more writing tools can be configured.
For example, the writing instrument B shown in FIG. 9 is a monochromatic writing instrument.
The writing instrument B is roughly configured to divide the writing instrument A into three parts in the circumferential direction, that is, the ink tank 10, the ink flow rate adjusting mechanism 30, and the pen body 20. A duplicate description is omitted by giving the same reference numerals to parts having the same basic structure.
[0038]
Next, the writing instrument C shown in FIG. 10 will be described.
The writing instrument C is configured by configuring the ink flow rate adjusting mechanism 30 'so that the elastic wall 31b is arranged at the rear end of the shaft tube 1 with respect to the writing instrument A described above, and the basic structure is the same as the writing instrument A. About the site | part which is, while attaching the same code | symbol, the detailed description which overlaps is abbreviate | omitted.
[0039]
The ink flow rate adjusting mechanism 30 ′ has an elastic wall portion 31b at the rear end portion of the shaft tube rear portion 1a, and opens and closes the valve member 36 in the shaft tube front portion 1b when the elastic wall portion 31b is pushed. It is configured.
[0040]
The shaft cylinder rear portion 1a is formed in a cylindrical shape that accommodates a plurality of ink tanks 10 therein, and an elastic wall portion 31b is fitted into the rear end opening, and screw fitting or press-fitting into the front end opening. The shaft cylinder front portion 1b is connected by, for example.
[0041]
Each ink tank 10 includes a stirrer 17 that is freely movable in the axial direction, and an operating rod 18 that passes through the substantial axis of the stirrer 17 and is slidable in the axial direction.
[0042]
The plurality of ink tanks 10 are connected to the front shaft portion 1b via joint members 15.
[0043]
The joint member 15 has an ink passage 15a for each ink tank 10 formed therein, and an ink circulation groove that circulates ink between the rear end opening of each ink passage 15a and the lower end of the stirrer 17. A plurality of 15b are formed, and a front end opening of the ink passage 15a serves as a valve seat 15c.
[0044]
The front shaft portion 1 b has a valve member 36 urged rearward by a spring 16 in the valve chamber 5 inside thereof. The valve member 36 is in contact with the front end of the operating rod 18, and opens and closes the valve seat 15 c of the joint member 15 as the operating rod 18 slides in the axial direction.
[0045]
According to this writing instrument C, when the elastic wall portion 31b is pushed from the rear at the portion corresponding to the selected ink tank 10, the operating rod 18 is pushed against the inner surface of the elastically deformed elastic wall portion 31b and moved forward. And the valve member 36 is pushed forward to open the valve seat 15c of the joint member 15.
Accordingly, the ink in the ink tank 10 is supplied to the pen body 20 through the ink circulation groove 15b, the ink passage 15a in the joint member 15, the ink passage 1b-1 in the front shaft portion 1b, and the like.
[0046]
Next, the writing instrument D of the aspect shown in FIG. 11 is demonstrated.
The writing instrument D includes two ink tanks 10, an ink flow rate adjusting mechanism 30 that adjusts the flow rate of ink discharged from each ink tank 10 for each selected color, and a pen body from the ink flow rate adjusting mechanism 30. A brush pen comprising a pen body 60 for receiving ink and water via a holding cover 40, and one of the two ink tanks 10 and 10 contains a pigment-type water-based black ink; The other is filled with a thinning liquid such as water or a water-based black ink previously diluted with water.
[0047]
In this writing instrument D, the writing instrument A is configured as a three-color writing instrument, whereas a two-color writing instrument (in this embodiment, an aqueous black ink and a thinning liquid are supplied to the pen pen body 60. The shape of the ink tank 10, the ink flow rate adjusting mechanism 30, and the pen body holding cover 40 is changed so that the pen body 20, 20, 20 is replaced with a pen body 60 for a brush pen. For parts that have the same basic structure as the writing instrument A, the same reference numerals are assigned and redundant description is omitted.
[0048]
The brush pen body 60 is a general brush pen body having flexibility, and is integrally formed of nylon fiber, polyester fiber, urethane resin having open cells, or the like. The brush pen pen body 60 is fitted to the pen body holding portion 42 of the pen body holding cover 40 at the rear end side.
[0049]
Thus, according to the writing instrument D having the above-described configuration, both the aqueous black ink and the thinning liquid supplied from the rear are ejected from the writing tip of the writing pen pen body 60. At this time, the water-based black ink and the thinning liquid are mixed in the process of flowing in the brush pen pen body 60 and discharged from the writing tip.
[0050]
Therefore, since the writing tool D having the above-described configuration can discharge the aqueous black ink and the thinning liquid by adjusting the flow rate by the ink flow rate adjusting mechanism 30, it is possible to write characters by adjusting the writing line density. It is also suitable for writing ink paintings that require subtle shade adjustments.
[0051]
In the above-described embodiment, the writing tools A, B, C, and D each show an example using a pigment-type water-based ink, but a dye-type water-based ink can also be used. In this case, the stirrers 10a and 17 for stirring the pigment can be omitted, and the ink flow rate adjusting mechanism can have a simpler structure.
[0052]
Further, in the above embodiment, air exchange is performed at the writing tip without providing a passage for air exchange on the peripheral surface of the pen body 20, 50, 80. An air exchange groove may be formed on the inner wall surface of the pen body holding portion 42 of the body holding cover 40.
[0053]
【The invention's effect】
According to the present invention, since the ink flow rate adjusting mechanism has a sealed structure that is operated by elastically deforming the elastic wall portion, there is no fear of ink leakage, and it is easy to press the elastic wall portion from the outside. The ink flow rate can be adjusted.
In addition, since a plurality of ink tanks are provided and a plurality of ink flow rate adjusting mechanisms are provided corresponding to each of the plurality of ink tanks, the ink flow rate can be adjusted for each selected ink tank.
In addition, the ink flow rate adjusting mechanism provided in the present invention is not operated by pressing the pen body against the writing surface like the conventional one, but is operated by pressing the elastic wall portion of the shaft cylinder peripheral wall from the outside. The writing tip of the pen body is not deformed by the operation of pressing the pen body.
In addition, according to the aspect in which the elastic wall portion is disposed, the ink flow rate can be easily adjusted in the writing posture, and further, slip prevention and grip feeling when gripped are improved. Thus, the elastic wall portion has an effect as a grip.
Furthermore, if the elastic wall portion is formed by double molding, the sealing structure of the ink flow rate adjusting mechanism can be made more reliable.
Furthermore, if the ink tank is configured to be replaceable, it can be used effectively for a long time without discarding the ink flow rate adjusting mechanism, the pen body, and the like .
In addition, if a plurality of ink tanks are filled with different colors of ink, the ink discharged from each ink tank can be supplied to the pen body with the flow rate adjusted for each selected color. Therefore, when writing for a long time, the problem of the conventional multi-color writing instrument that the writing line of any color will be blurred due to the bias of the writing pressure at the tip of the writing can be solved, and each color can be written at an equal density. It is also possible to write only the color selected intentionally.
Further, if the rear end side of the pen body is partitioned corresponding to each ink tank and the front end side is formed integrally, a plurality of colors of ink are ejected from the writing front end portion while gradually mixing on the front end side of the pen body. Therefore, it is possible to obtain a gradation-like writing line in which adjacent inks of different colors are mixed in the vicinity of the boundary between them.
In addition, if the rear end side of the pen body is partitioned corresponding to the ink tanks, and the front end side is partitioned corresponding to the ink tanks, adjacent different color inks are mixed. A plurality of color writing lines can be obtained, and the shade of each color can be adjusted by the ink flow rate adjusting mechanism.
Further, according to the embodiment in which the pen body is a pen body for a brush pen, a brush pen, which has conventionally had a flexible pen body, has been difficult to adjust the ink flow rate by pressing the pen body. Easy structure.
Further, according to the aspect having the elastic wall portion at the rear end portion of the shaft cylinder, the ink flow rate can be easily adjusted without causing ink leakage by the knocking operation at the rear end of the shaft tube.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of a writing instrument according to the present invention.
2 is a cross-sectional view taken along line (I)-(I) in FIG.
3 is a cross-sectional view taken along line (II)-(II) in FIG.
4A and 4B are perspective views showing an example of a pen body, where FIG. 4A is a state before the pen body is fitted into the pen body holding cover, and FIG. 4B is a state after the pen body is fitted into the pen body holding cover. Indicates.
FIG. 5 is a perspective view showing another example of a pen body, where (a) shows a state before the pen body is fitted into the pen body holding cover, and (b) shows a state after the pen body is fitted into the pen body holding cover. Indicates the state.
6A and 6B are perspective views showing another example of the pen body, in which FIG. 6A shows a state before the pen body is fitted into the pen body holding cover, and FIG. 6B shows a state after the pen body is fitted into the pen body holding cover. Indicates the state.
FIG. 7 is a perspective view showing a state in which writing lines composed of a plurality of colors are written by the writing instrument.
FIG. 8 is a diagram showing the usage state of the writing instrument according to the present invention, with the main part cut away.
FIG. 9 is a longitudinal sectional view showing another example of the writing instrument according to the present invention.
FIG. 10 is a longitudinal sectional view showing another example of the writing instrument according to the present invention.
FIG. 11 is a longitudinal sectional view showing another example of the writing instrument according to the present invention.
[Explanation of symbols]
3: Valve chamber 10: Ink tank 20: Pen body 30: Ink flow rate adjustment mechanism 33: Valve member 34: Operation member 31b: Elastic wall 40: Pen body holding cover 60: Pen body A, B, C for brush pen D: Writing instrument

Claims (9)

In a writing instrument having an ink flow rate adjusting mechanism for adjusting the flow rate of ink supplied from an ink tank to a pen body,
The ink flow rate adjusting mechanism has an elastic wall portion on a peripheral wall of the shaft cylinder, and is configured to open and close a valve member in the shaft cylinder when the elastic wall portion is pressed .
A plurality of the ink tanks and a plurality of the ink flow rate adjusting mechanisms corresponding to each of the plurality of ink tanks,
A writing instrument characterized in that the flow rate of ink supplied to a pen body can be adjusted for each selected ink tank .   The writing instrument according to claim 1, wherein the elastic wall portion is disposed at a gripped portion of the outer peripheral wall of the shaft cylinder.   The writing instrument according to claim 1, wherein the elastic wall portion is formed by double molding.   4. The writing instrument according to claim 1, wherein the ink tank is replaceable. The writing instrument according to any one of claims 1 to 4, wherein the plurality of ink tanks are filled with inks of different colors . 6. The writing instrument according to claim 5 , wherein a rear end side of the pen body is partitioned corresponding to each of the ink tanks, and a front end side thereof is integrally formed . 6. The writing instrument according to claim 5, wherein a rear end side of the pen body is partitioned corresponding to each ink tank, and a front end side thereof is separated corresponding to each ink tank . The writing instrument according to any one of claims 1 to 6, wherein the pen body is a pen body for a brush pen . In a writing instrument having an ink flow rate adjusting mechanism for adjusting the flow rate of ink supplied from an ink tank to a pen body,
The ink flow rate adjusting mechanism has an elastic wall portion at a rear end portion of the shaft cylinder, and is configured to open and close a valve member in the shaft cylinder when the elastic wall portion is pressed.
A plurality of the ink tanks and a plurality of the ink flow rate adjusting mechanisms corresponding to each of the plurality of ink tanks,
A writing instrument characterized in that the flow rate of ink supplied to a pen body can be adjusted for each selected ink tank .

Images