Writing instrument and writing unit replacement unit

Abstract

This invention provides a writing tool that allows for easy selection of a method of use that suppresses handwriting defects such as blurring and skipped lines, and a method of use that produces handwriting including blurring. The writing tool comprises: a container body (2) for holding writing ink; a writing body (7) configured to close the opening (2c) of the container body; and a cap member (4) detachably attached to the opening and covering the writing body, allowing writing on the writing surface by allowing ink from the container body to seep out from the writing body. The container body has a bottom (2a), a body (2b) continuous with the bottom and rising upwards, and an opening (2c) continuous with the body and rising obliquely upwards. The angle between the axis (Ax1) of the container body orthogonal to the bottom surface and the axis (Ax2) of the opening passing through the center of the opening forms an obtuse angle.

Description

Technical Field

[0001] The present invention relates to a writing instrument that can easily select a method of use that can suppress handwriting defects such as blurring and skipping lines, and a method of use that can obtain handwriting including blurring, etc., and a writing part replacement unit preferably used in the writing instrument. Background Technology

[0002] Patent document 1 discloses a writing instrument that contains liquids such as paint, pigment, and ink in a container, allowing the liquid to seep out from a relatively large writing section formed by applying continuous pores to a synthetic resin material at the mouth of the container.

[0003] In the writing instrument disclosed in Patent Document 1, the container for holding liquids such as ink has a planar bottom capable of supporting the container on a horizontal surface, and a body that is continuous with the bottom and tapers in diameter upwards. Furthermore, the writing part is mounted to cover the opening formed at the upper end of the body.

[0004] Similar to the writing instrument disclosed in Patent Document 1, Patent Documents 2 and 3 disclose writing instruments that contain liquids such as ink in a container, allowing the liquid to seep out from a writing part made of rubber sponge or the like, which has a relatively large area and is installed at the mouth of the container.

[0005] In the writing instruments disclosed in Patent Documents 2 and 3, the container is described as teardrop-shaped. That is, the main body of the container is roughly spherical, with a cylindrical opening that protrudes slightly elongated from a part of it, and a writing part made of sponge or the like is installed to cover the opening.

[0006] In the various writing instruments disclosed in these patent documents, the axis of the container body and the opening for mounting the writing part are aligned on the same straight line. That is, the writing instrument is constructed, for example, with the writing part facing downwards relative to the paper on the table.

[0007] Therefore, ink can be smoothly supplied from the container body to the downward-facing writing surface, and the required amount of ink can be smoothly supplied even for writing surfaces with relatively large areas. As a result, a writing tool can be provided that prevents the handwriting (line) from becoming blurry, skipped, or uneven.

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2006-123305

[0011] Patent Document 2: Japanese Patent Application Publication No. 2013-240895

[0012] Patent Document 3: Japanese Patent Application Publication No. 2013-240896 Summary of the Invention

[0013] The problem the invention aims to solve

[0014] With recent improvements in the construction of writing instruments and the development of ink compositions, as disclosed in the aforementioned patent documents, proposals for writing instruments that allow writing on a writing surface by allowing paint, pigments, ink, etc., to seep out from a writing part made of a sponge or the like with a relatively large area have increased, and the demand for such instruments continues to grow.

[0015] Along with this, various proposals have been put forward for writing instruments aimed at obtaining writing instruments that, as mentioned above, supply ink to the writing part well, and whose handwriting does not become blurred, skipped lines, or uneven.

[0016] However, on the other hand, there is also a potential requirement to obtain strokes or lines that include individual blurring, etc., using the writing tool that can depict thicker strokes or lines.

[0017] Corresponding to the aforementioned requirements, the main objective of this invention is to provide a writing tool that allows for easy selection of a method of use that suppresses handwriting defects such as blurring and skipped lines, and a method of use that yields handwriting including blurring.

[0018] Solution for solving the problem

[0019] The writing instrument of the present invention, completed to solve the aforementioned problem, comprises: a container body for holding writing ink; a writing body configured to close the opening of the container body; and a cap member detachably attached to the opening and covering the writing body, wherein writing is possible on the writing surface by allowing ink from the container body to seep out from the writing body. The container body is characterized by having a bottom, a body that is continuous with the bottom and rises upwards, and the opening that is continuous with the body and rises obliquely upwards. The angle between the axis of the container body orthogonal to the bottom surface and the axis of the opening passing through the center of the opening forms an obtuse angle.

[0020] In this case, it is preferable that a stirring ball for writing ink is housed inside the container body, and the diameter of the stirring ball is larger than the opening diameter of the writing part that supports the writing body and is installed at the mouth facing inward towards the container.

[0021] Furthermore, it is preferable that the writing instrument, which is installed in a manner that closes the opening, is made of a soft foam material, and it is also preferable that titanium oxide is mixed into the writing ink.

[0022] On the other hand, in the writing instrument of the present invention, it is preferable that the container body and the cap member installed on the mouth of the container body are covered by the packaging sheet in a close fit.

[0023] Furthermore, a crack is applied to the packaging sheet, which allows the portion of the packaging sheet covering the cap member to be peeled off. The crack is formed parallel to the bottom of the container body along the smallest cross-sectional portion of the container body between the body and the mouth.

[0024] Furthermore, in the writing instrument of the present invention, the following structure can be adopted: an additional writing unit is detachably installed at the opening of the container body as an accessory, the additional writing unit receiving ink that seeps out from the writing body and supplying the ink to the writing surface.

[0025] Furthermore, the writing part replacement unit preferably used in the writing instrument of the present invention comprises: a writing part removal cap member that is threadedly engaged with the opening of the container body and has an opening on its top surface; a writing part pull-out member that is cylindrical in shape, one end of which is inserted into the opening of the writing part removal cap member, and a flexural portion that flexes toward the axial direction is applied to the one end, and a locking portion that can lock with the writing part installed at the opening of the container body is formed in the flexural portion; a flexural inhibition rod that suppresses the flexural action of the flexural portion toward the axial direction by being inserted into the axial hole of the cylindrical writing part pull-out member; and a spring that is installed between the top surface of the writing part removal cap member and the other end of the writing part pull-out member in a manner that surrounds the writing part pull-out member.

[0026] The effects of the invention

[0027] According to the writing instrument of the present invention, the angle between the axis of the container body orthogonal to the bottom surface of the container body and the axis passing through the center of the opening of the container body forms an obtuse angle. Therefore, for example, when writing with the bottom of the container body facing upward relative to the vertical writing surface, sufficient ink can be supplied to the writing material disposed at the opening of the container body.

[0028] Furthermore, when writing with the bottom of the container body facing down, the ink supply to the writing surface can be limited.

[0029] Therefore, it is possible to provide a writing tool that, by selecting the posture of the container body during writing, allows for the selection of a usage method that can suppress handwriting defects such as blurring and skipped lines, and a usage method that can actively obtain handwriting including blurring.

[0030] In addition, by installing an additional writing unit as an accessory on the writing instrument, the additional writing unit receives ink seeping from the writing surface of the writing instrument, and thus enables the writing surface to be written in a separate manner.

[0031] Furthermore, according to the writing part replacement unit used in the writing instrument of the present invention, the writing part installed at the opening of the container body constituting the writing instrument can be easily removed using the writing part pull-out member in the state of having a deflection inhibition rod installed. Therefore, it is possible to cope with the damage of the writing material and replenish the ink in the container body that serves as the pen barrel, which can help ensure the continued use of the writing instrument. Attached Figure Description

[0032] Figure 1 This describes the overall appearance and structure of the writing instrument of the present invention. Figure 1 (A) is the front view. Figure 1 (B) is a side view. Figure 1 (C) is the rear view. Figure 1 (D) is the top view. Figure 1 (E) is a bottom view.

[0033] Figure 2 This describes the overall appearance and structure of the writing instrument. Figure 2 (A) is a three-dimensional view viewed from the front along the right side. Figure 2 (B) is a three-dimensional view viewed from the right side along the back side.

[0034] Figure 3 It is an enlarged longitudinal sectional view showing the state of the writing instrument after it has been cut in half at the center.

[0035] Figure 4 This indicates that the writing instrument's external structure was covered using packaging material. Figure 4 (A) is a three-dimensional diagram that covers the overall state. Figure 4 (B) is a three-dimensional view of a portion of the packaging sheet that has been peeled off from the crack.

[0036] Figure 5 An assembly diagram showing the writing section installed at the mouth of the container body. Figure 5 (A) is a three-dimensional view viewed from the side of the writing surface on the front surface. Figure 5 (B) is the central sectional view. Figure 5 (C) is a three-dimensional view viewed from the rear side.

[0037] Figure 6 This indicates the individual structure of the valve seat component. Figure 6 (A) is a side view. Figure 6 (B) is a longitudinal sectional view. Figure 6 (C) is a three-dimensional view viewed from the front surface side. Figure 6(D) is a stereoscopic view viewed from the rear side.

[0038] Figure 7 This indicates the individual structure of the valve core component. Figure 7 (A) is the front view. Figure 7 (B) is a side view. Figure 7 (C) is a three-dimensional view viewed from the front side. Figure 7 (D) is a stereoscopic view viewed from the rear side.

[0039] Figure 8 The structure of individual components representing the handwriting style. Figure 8 (A) is a three-dimensional image viewed from the front side. Figure 8 (B) is a three-dimensional view viewed from the rear side. Figure 8 (C) is the central longitudinal section view.

[0040] Figure 9 express Figure 8 The writing material shown is mounted on a writing instrument, resulting in a deformation of certain parts of the writing material. Figure 9 (A) is the front view. Figure 9 (B) is a side view. Figure 9 (C) is the central longitudinal section view.

[0041] Figure 10 This indicates the individual structure of the writing support ring. Figure 10 (A) is the rear view. Figure 10 (B) is a three-dimensional view viewed from the rear side. Figure 10 (C) is the central sectional view.

[0042] Figure 11 This indicates the individual structure of the hat components. Figure 11 (A) is a three-dimensional image viewed from the front side. Figure 11 (B) is the central sectional view. Figure 11 (C) is a three-dimensional view viewed from the rear side.

[0043] Figure 12 Indicates the status of the writing instrument in use. Figure 12 (A) is a side view showing an example of writing with the bottom of the container body facing upwards. Figure 12 (B) is a side view showing an example of writing with the bottom of the container body facing down.

[0044] Figure 13 Is Figures 1-12 The diagram shows a three-dimensional view of a writing instrument equipped with a first additional writing unit as an accessory.

[0045] Figure 14 This indicates that the writing instrument is equipped with the first additional writing unit. Figure 14 (A) is the front view. Figure 14 (B) is the central sectional view. Figure 14 (C) is the rear view.

[0046] Figure 15 This indicates that the first writing unit has been added. Figure 15 (A) is a top view. Figure 15 (B) is the front view. Figure 15 (C) is the central sectional view. Figure 15 (D) is the right view.

[0047] Figure 16 This indicates the individual structure of the retaining element that constitutes the first additional writing unit. Figure 16 (A) is the front view. Figure 16 (B) is a three-dimensional view viewed from the front side. Figure 16 (C) is the rear view. Figure 16 (D) is a stereoscopic view viewed from the rear side. Figure 16 (E) is the central sectional view.

[0048] Figure 17 This is a three-dimensional diagram of a writing instrument with a second additional writing unit installed as an accessory.

[0049] Figure 18 This indicates that the writing instrument is equipped with a second additional writing unit. Figure 18 (A) is the front view. Figure 18 (B) is the central sectional view. Figure 18 (C) is the rear view.

[0050] Figure 19 This indicates the individual structure of the retaining element that constitutes the second additional writing unit. Figure 19 (A) is the front view. Figure 19 (B) is a three-dimensional view viewed from the front side. Figure 19 (C) is the rear view. Figure 19 (D) is a stereoscopic view viewed from the rear side. Figure 19 (E) is the central sectional view.

[0051] Figure 20 This is a three-dimensional diagram of a writing instrument with a third additional writing unit installed as an accessory.

[0052] Figure 21 This indicates that the writing instrument is equipped with a third additional writing unit. Figure 21 (A) is the front view. Figure 21 (B) is the central sectional view. Figure 21 (C) is the rear view.

[0053] Figure 22 This indicates that a third writing unit has been added. Figure 22 (A) is the front view. Figure 22 (B) is the central sectional view.

[0054] Figure 23 This is a 3D diagram showing the unfolded state of the third additional writing unit.

[0055] Figure 24 This is a central sectional view of the unfolded state of the third added writing unit.

[0056] Figure 25 This indicates that the writing instrument is equipped with a fourth additional writing unit as an accessory. Figure 25 (A) is the front view. Figure 25 (B) is a side view.

[0057] Figure 26 This indicates that the writing instrument is equipped with a fourth additional writing unit. Figure 26 (A) is a central sectional view. Figure 26 (B) is a three-dimensional view viewed from the front side.

[0058] Figure 27 This indicates that a fourth writing unit has been added. Figure 27 (A) is the rear view. Figure 27 (B) is the central sectional view. Figure 27 (C) is a three-dimensional view viewed from above.

[0059] Figure 28 This indicates that the writing section has been restructured. Figure 28 (A) is a 3D diagram. Figure 28 (B) is a decomposed stereograph.

[0060] Figure 29 This indicates that the writing section has been restructured. Figure 29 (A) is the left view. Figure 29 (B) is the front view. Figure 29 (C) is the right view. Figure 29 (D) is a longitudinal sectional view.

[0061] Figure 30 This refers to the cap component for disassembling the writing section, which constitutes the writing section replacement unit. Figure 30 (A) is a three-dimensional view with the top surface positioned closer to the front. Figure 30 (B) is a three-dimensional view with the top surface on the back side.

[0062] Figure 31 This is a three-dimensional diagram showing the structure of a single component of the writing section pull-out member that constitutes the writing section replacement unit.

[0063] Figure 32 This indicates the initial state after the writing unit of the writing instrument has been installed and the unit has been replaced. Figure 32 (A) is a 3D diagram. Figure 32 (B) is a longitudinal sectional view.

[0064] Figure 33 This indicates the first state, where the writing instrument is equipped with a writing section replacement unit. Figure 33 (A) is a 3D diagram. Figure 33 (B) is a longitudinal sectional view.

[0065] Figure 34 This indicates the second state, where the writing instrument is equipped with a writing section replacement unit. Figure 34 (A) is a 3D diagram. Figure 34 (B) is a longitudinal sectional view.

[0066] Figure 35 This indicates that the writing unit has been disassembled using the self-writing tool of the writing unit replacement unit. Figure 35 (A) is a 3D diagram. Figure 35 (B) is a longitudinal sectional view.

[0067] Figure 36 This indicates the final state of the writing unit after it has been disassembled and replaced with a new writing unit. Figure 36 (A) is a 3D diagram. Figure 36 (B) is a longitudinal sectional view. Detailed Implementation

[0068] The writing instrument of the present invention will be described based on the embodiments shown in the accompanying drawings.

[0069] Figures 1-3 This illustrates the overall structure of the writing instrument of the present invention, wherein, Figure 3 Represented by an enlarged sectional view. Therefore, it is first based on... Figure 3 The overall structure of the writing instrument of the present invention will be described.

[0070] Furthermore, in the figures shown below, the same reference numerals are used to denote the same parts, but in some of the figures, the reference numerals are used to denote representative parts for the convenience of the paper. For details of each part, the reference numerals used in the figures showing the structure of the individual items are used for explanation.

[0071] like Figures 1-3 As shown, the writing instrument 1 of the present invention includes a bottle-shaped container body 2 for holding writing ink (not shown). The bottom 2a of the container body 2 is formed into an elliptical shape (see reference). Figure 1 The container body 2 is constructed of a flat plate (E) so that it can be placed on a horizontal surface. The container body 2 has a torso 2b that is continuous with the bottom 2a and rises upward.

[0072] The upright surface on the front side of the container body 2 of the torso 2b, i.e. Figure 3 The left side of the container body 2 shown is a sloping body 2b1 with a diameter that decreases as it rises upward toward the center of the container body 2.

[0073] Additionally, the raised surface on the back side of the container body 2, i.e. Figure 3 The upright surface on the right side of the container body 2 shown forms an upright torso 2b2 that is approximately orthogonal to the bottom 2a.

[0074] Furthermore, a neck 2b3 that curves toward the front surface of the container body 2 is formed on the upper part of the upright body 2b2, and a cylindrical mouth 2c that rises obliquely upward is integrally formed along the curved surface of the neck 2b3.

[0075] Therefore, the angle between the axis Ax1 of the container body 2, which is orthogonal to the bottom 2a of the container body 2, and the axis Ax2 of the opening, which passes through the center of the opening 2c, is an obtuse angle. In the example shown in the figure, the angle between the axis Ax1 of the container body 2 and the axis Ax2 of the opening 2c is set to approximately 120 degrees.

[0076] Furthermore, as described above, the opening 2c is configured to be located directly above the inclined body 2b1, whose diameter decreases as it rises upward toward the center of the container body 2.

[0077] Therefore, weight balance is considered in a way that prevents the center of gravity of the writing instrument 1, including the writing part 3 which is installed at the opening 2c (described later), from shifting towards the front surface of the container body 2 on which the opening 2c is formed.

[0078] Furthermore, multiple finger hook recesses 2d are formed on the front and back surfaces of the container body 2 for fingertips to hook when holding the container body 2. These finger hook recesses 2d function as anti-slip parts when holding the container body 2.

[0079] Furthermore, the container body 2 is preferably molded from a flexible synthetic resin. This creates a squeeze container that can be deformed by gently pressing the left and right sides of the container body 2 with the hand or similar means.

[0080] Furthermore, a writing part 7 (described later) is arranged in the writing section 3 of the opening 2c installed on the container body 2, with the opening 2c closed. This writing part 7 allows ink to seep out from the container body 2, enabling writing. Moreover, a cap member 4 covering the writing part 7 is detachably installed using the external thread 2e formed on the circumferential surface of the cylindrical portion constituting the opening 2c, thus forming a writing tool 1.

[0081] Figure 4This indicates that the packaging sheet 11 covers the external structure of the writing instrument 1. Figure 4 In the image, the packaging sheet 11 is shown with a shaded line.

[0082] The packaging sheet 11 is, for example, a heat-shrinkable resin sheet shaped into a cylinder, which covers the writing instrument 1 in a way that fits snugly against its outer contour. Figure 4 (A) indicates a state where the writing instrument 1 is completely covered by the packaging sheet 11, and the product (writing instrument 1) is unused. Additionally, Figure 4 (B) indicates the following state: by using the dotted crack 11c applied to the packaging sheet 11, the cap-side peeling sheet 11b is separated from the body-side sheet 11a, so that the product (writing instrument 1) can be used.

[0083] Furthermore, the dashed cracks 11c applied to the packaging sheet 11 are intended to be pre-formed locally on the heat-shrinkable resin sheet. Moreover, when the resin sheet is heat-shrinked and tightly adheres to the container body 2, the position of the dashed cracks 11c is set to run along... Figure 3 The smallest cross-sectional portion of the container body 2 between the torso 2b and the mouth 2c is positioned parallel to the bottom 2a of the container body 2.

[0084] By setting the position of the dotted crack 11c in this way, most of the outer contour of the container body 2 with a special shape can be covered by the main body side sheet 11a.

[0085] Therefore, by pre-applying the printing of the product name, logo, etc. of the writing instrument 1 to the heat-shrinkable resin sheet side corresponding to the main body sheet 11a, it is possible to provide a writing instrument 1 in which the product name, logo, etc. are marked on a larger area of ​​the main body sheet 11a.

[0086] Figure 5 This refers to the writing part 3 installed at the opening 2c of the container body 2. The writing part 3 consists of a valve seat component 5, a valve core component 6, a sheet-shaped writing body 7, and a support ring 8 for the writing body. The valve seat component 5 is cylindrical and has a valve opening on its front surface. The valve core component 6 is housed within the valve seat component 5 and has a valve core that is subjected to force by a spring. The sheet-shaped writing body 7 is installed on the front surface of the valve seat component 5 to cover the opening 2c of the container body 2. The support ring 8 for the writing body attaches the periphery of the writing body 7 to the valve seat component 5.

[0087] Hereinafter, the components constituting the writing section 3 will be described based on the accompanying drawings, which are shown as individual components.

[0088] Figure 6 This indicates the individual structure of the valve seat component 5 that constitutes the writing section 3.

[0089] The valve seat component 5 is integrally formed into a cylindrical shape, with its front surface portion closed and a valve port 5a opening in its central portion. The valve port 5a is surrounded by a cone shape that tapers towards the front surface from the inner radial direction. The valve is closed by installing the frustum-shaped valve core 6c of the valve core component 6 (described later) on the valve port 5a.

[0090] The outer peripheral surface of the valve seat member 5 is formed with the same diameter along the axial direction, forming a fitting portion 5b that fits into the opening 2c of the container body 2. A tapered portion 5c with a slightly reduced outer diameter is formed from its rear half along the rear end. This tapered portion 5c functions as a guide when the writing part 3 is installed in the opening 2c of the container body 2.

[0091] A flange portion 5d with a diameter larger than that of the fitting portion 5b is formed on the front surface side of the valve seat component 5. The flange portion 5d abuts against the front end of the opening portion 2c of the container body 2, thereby positioning the writing portion 3.

[0092] Furthermore, an annular locking portion 5e is formed in the opening at the rear end of the valve seat member 5, protruding inward. This annular locking portion 5e functions as a stop to prevent the valve core member 6 from falling off when the valve core member 6 (described later) is installed in the valve seat member 5.

[0093] Furthermore, an annular protrusion 5f is formed on the front surface of the valve seat member 5. This annular protrusion 5f supports the writing body 7 from the back side of the writing body 7 (described later) and serves to position the writing body 7.

[0094] Figure 7 This indicates the individual structure of the valve core component 6 that constitutes the writing section 3.

[0095] The valve core component 6 is integrally molded from elastic synthetic resin and has three spring bodies 6b extending spirally upward from the annular body 6a. These spring bodies 6b are arranged at a 120-degree pitch in the circumferential direction of the annular body 6a, and a frustum-shaped valve core 6c is formed at the upper end of the spring bodies 6b. Furthermore, a valve stem 6d is formed in the center of the valve core 6c, protruding from the valve core 6c.

[0096] The outer diameter of the annular body 6a is approximately equal to the inner diameter of the cylindrical valve seat member 5, and slightly larger than the inner diameter of the annular locking portion 5e. Therefore, by inserting and pressing the valve stem 6d of the valve core member 6 into the valve seat member 5 from the annular locking portion 5e at the rear end, the rear annular body 6a passes over the annular locking portion 5e of the valve seat member 5 and is housed within the valve seat member 5. Furthermore, the annular body 6a of the valve core member 6 is positioned within the valve seat member 5 in a state of being locked into the annular locking portion 5e of the valve seat member 5 (see reference). Figure 5 (B)]

[0097] Thus, the valve core 6c abuts against the valve port 5a to achieve a closed valve state, and the central valve stem 6d protrudes slightly forward from the valve port 5a. That is, the writing part 3 is equipped with a central valve 3a consisting of the valve port 5a of the valve seat member 5 and the valve core 6c of the valve core member 6.

[0098] Figure 8 This indicates the individual structure of the writing style 7 that constitutes the writing section 3.

[0099] The writing font 7 is formed using a soft foamed sheet material. The foamed sheet material is preferably made of polyurethane or polyethylene raw materials with continuous bubble structure, and rubber sponge, etc. can also be used, but from the point of view of durability, foamed polyurethane is preferred.

[0100] In this writing font 7, a spherical protrusion 7a is formed in the center, which is made by cutting the foam sheet material into a circle, and a short cylindrical portion 7b is formed around the periphery of the spherical protrusion 7a, and an annular flange portion 7c is formed at the end of the cylindrical portion 7b facing outward, in a way that matches the shape of the front surface side of the valve seat member 5.

[0101] Furthermore, for the portion of the writing body 7 that forms a spherical protrusion 7a in the center, in order to maintain the original thickness of the foamed sheet material, the short cylindrical portion 7b and the flange portion 7c at its periphery are thinned relative to the spherical protrusion 7a, for example, by stamping.

[0102] Figure 9 Indicates by Figure 8 The writing font 7 shown is installed on Figure 3 The state of partial deformation of the writing part 3 and the writing font 7 shown.

[0103] That is, such as Figure 9 As shown in (C), a recess 7d is formed on the back side of the spherical protrusion 7a, which is deformed by the top end of the valve stem 6d protruding from the center of the valve seat member 5.

[0104] Furthermore, on the back side of the spherical protrusion 7a, an annular recess 7e is formed along the inner side of the cylindrical portion 7b in a manner that surrounds the central recess 7d. This recess 7e is deformed by abutting against the annular protrusion 5f that protrudes toward the front surface of the valve seat member 5.

[0105] Furthermore, a plurality of recesses 7f, formed by a plurality of small protrusions 8d formed on the side of the support ring 8, are formed on the front surface side of the annular flange portion 7c, and are deformed by being pressed by the writing support ring 8 described later. Moreover, a groove 7g, which is deformed by being pressed by the valve seat member 5, is formed on the back side side of the flange portion 7c.

[0106] Figure 10 This indicates the individual structure of the writing support ring 8 that constitutes the writing section 3.

[0107] The support ring 8 presses against the periphery of the writing surface 7 mounted on the front surface of the valve seat member 5 along the periphery of the front surface side of the valve seat member 5, thereby supporting the surface-shaped writing surface 7 along the periphery.

[0108] The support ring 8 is molded from resin raw material and has a tapered surface 8a with a slightly reduced outer diameter extending from the back side to the front surface side. On the inner side of the support ring 8, there are concentrically formed annular first step portion 8b and second step portion 8c with an inner diameter decreasing from the back side to the front surface side.

[0109] Furthermore, a plurality of small protrusions 8d protruding toward the rear side are continuously formed along the circumferential direction at the second step portion 8c. Therefore, the writing object 7, pressed against the front surface of the valve seat member 5 by the support ring 8, is supported in a manner that prevents loosening by the plurality of small protrusions 8d. Additionally, by welding the support ring 8 along the flange portion 5d of the valve seat member 5, a structure is formed... Figure 5 The writing section 3 is shown.

[0110] Furthermore, the writing part 3 is mounted to the opening 2c of the container body 2 using the conical part 5c of the valve seat member 5, and is fitted and mounted inside the opening 2c of the container body 2 using the fitting part 5b of the valve seat member 5 [see reference]. Figure 3 〕.

[0111] Figure 11 This indicates the single-piece structure of hat component 4.

[0112] The cap component 4 is a cylindrical shape with its ends closed by the top surface 4a, and its outer circumferential surface is continuously covered with a number of knurled grooves 4b that are grooved and recessed along the axial direction.

[0113] Furthermore, an internal thread 4c is applied to the inner circumferential surface on the opening side, and an annular protruding ring 4d is formed axially on the back side of the top surface 4a on the inner side of the internal thread 4c.

[0114] The cap component 4, as shown Figure 3 The cap member 4 is installed at the opening 2c of the container body 2. By threading the internal thread 4c of the cap member 4 onto the external thread 2e of the opening 2c, the cap member 4 can be installed at the opening 2c. This allows the writing instrument 1 to be stored in a state that covers the writing part 7 of the writing part 3.

[0115] At this time, the protruding ring 4d inside the cap component 4 abuts against the writing support ring 8 of the writing part 3 and seals the writing part 7, thus suppressing the evaporation of ink solvent from the writing part 7.

[0116] In the writing instrument 1, such as Figure 3 As shown, writing ink (not shown) is stored inside the container body 2 along with the stirring ball 9.

[0117] The stirring ball 9 is made of steel or glass. Preferably, the diameter D1 of the stirring ball 9 is larger than the diameter D2 of the opening of the writing part 3, which supports the writing body 7 and is mounted on the mouth 2c, facing inwards from the container. That is, in this embodiment, as... Figure 3 As shown, the diameter D1 of the stirring ball 9 is selected to be larger than the inner circumferential diameter D2 of the annular locking part 5e of the valve seat member 5.

[0118] Therefore, the large-diameter and heavier stirring ball 9 can effectively stir the precipitation of the main colorant in the writing ink used in writing instruments with relatively thick lines. This helps to prevent uneven writing (uneven coloring) in the lines.

[0119] As a preferred writing ink housed within the container body 2, it contains at least pigment particles, wet silica, hydrated kaolin, a coagulation control agent, and water. Particularly preferred is that the pigment particles contain titanium dioxide, and the coagulation control agent is present in an ink composition of 0.05% to 1.0% by mass based on the total mass of the writing ink.

[0120] Examples of pigment particles include inorganic pigments such as metal oxides or metal salts, and organic pigments such as organic pigments or lake pigments. Metal oxide particles are particularly preferred among inorganic pigment particles. In particular, since titanium oxide is white, it can achieve a variety of colors by combining it with complementary pigments described later, making it preferred. Furthermore, if titanium oxide with an alumina treatment on its surface is used, the dispersion stability is improved, making it particularly preferred. Additionally, glossy pigments, such as aluminum pigments, can also be used as pigments. The average particle size of the pigment particles is preferably 0.1 μm to 10 μm. The average particle size described in this specification can be measured based on the particle size (D50) at 50% volume accumulation of the particle size distribution measured by laser diffraction using a laser diffraction particle size distribution measuring machine (trade name "Microtrac HRA 9320-X 100", Nikkiso Co., Ltd.). Unless otherwise specified, the average particle size refers to the volume-based average particle size. Based on the total mass of the ink composition, the content of pigment particles in the ink composition is preferably 10 to 40% by mass. If the content of pigment particles is within the above range, it is possible to prevent a decrease in ink extrusion and to maintain the invisibility of the ink composition and the handwriting formed using the ink composition.

[0121] Wet silica is an amorphous silica synthesized via a wet process. It consists of relatively large primary particles (a few to tens of nm in size) aggregated together, and secondary particles (a few to tens of μm in size) that are difficult to disperse into primary particles. In this invention, wet silica has a higher specific surface area and more silanol groups on its surface compared to dry silica. Therefore, it forms a loose cross-linked network through interaction with pigment particles. Moreover, since it can form loose and large aggregates with agglomeration control agents and agglomeration dispersants, the inclusion of wet silica in the ink composition improves the dispersion stability of pigment particles, thereby improving the redispersibility of the aggregates. On the other hand, while dry silica can maintain dispersion stability, even a small amount adds to it, resulting in structural viscosity and increasing ink viscosity, which is not preferred. Furthermore, when using paper as the writing surface, wet silica strongly acts as a filler, preventing pigment particles from entering the paper fibers. By using it in combination with hydrated kaolin (described later), it can improve the color rendering of handwriting. The average particle size of the wet silica is preferably 1 μm to 5 μm. If the average particle size of the wet silica is within this range, it can be stably dispersed in the ink composition, resulting in a high level of pigment precipitation inhibition. Based on the total mass of the ink composition, the content of wet silica in the ink composition is preferably 1% to 3% by mass.

[0122] The agglomeration control agent can combine with the relatively low-density aggregates formed from the wet silica, and further disperses the hydrated kaolin, extender materials, etc., described later in the ink composition, thereby producing larger aggregates. Using this agglomeration control agent, the hardening of the ink composition is prevented, and larger aggregates are produced, thus improving redispersibility. For example, cellulose derivatives can be used as the agglomeration control agent, and two or more cellulose derivatives can be used in combination. Examples of cellulose derivatives include carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl ethyl cellulose, and their salts. Based on the total mass of the ink composition, the content of the agglomeration control agent in the ink composition is preferably 0.1 to 0.5% by mass.

[0123] Hydrous kaolin is a flat or plate-shaped natural clay mineral obtained by refining kaolin clay, a natural clay mineral, and whose main component is aluminum silicate containing water of crystallization. In this invention, as described above, hydrous kaolin has a flat or plate-shaped particle shape. Therefore, by containing hydrous kaolin in the ink composition, when using paper as the writing surface, hydrous kaolin strongly acts as a filler, preventing pigment particles from entering between the paper fibers, and further improving the color rendering of the handwriting. Furthermore, hydrous kaolin is uniformly dispersed in the ink composition in a relatively low-density aggregate formed by pigment particles, wet silica, and agglomeration control agent. Therefore, compared to using calcined kaolin, it can improve redispersibility to produce a relatively low-density and large-volume aggregate. Moreover, during writing, due to its flat or plate-shaped particle shape, hydrous kaolin is placed parallel to the paper surface, so it does not scratch the paper surface even when rewriting, thus allowing writing without cutting the paper. The average particle size of the hydrated kaolin is preferably 0.5 μm to 2 μm. If the average particle size of the hydrated kaolin is within this range, the redispersibility of the ink composition and the color development of the writing can be improved, and paper-cutting can be prevented. Based on the total mass of the ink composition, the content of hydrated kaolin in the ink composition is preferably 5% to 15% by mass. If the content of hydrated kaolin is within this range, it is possible to prevent the ink viscosity from becoming too high, hardening, and cutting the paper during writing. Furthermore, the ink composition and the invisibility of the writing formed using this ink composition can be maintained.

[0124] In addition, as other components, resins, coagulants, extenders, complementary pigments, surfactants, preservatives, wetting agents, defoamers, rust inhibitors, pH adjusters, bubble inhibitors, bubble absorbers, shear-thickening agents, and viscosity modifiers may be added as needed, without affecting the performance of the ink as a writing instrument.

[0125] The viscosity of the ink composition is preferably 1 to 20 mPa·s. The viscosity of the composition can be measured using a rotational viscometer (25°C, 10 rpm, TV-20, TOKIMEC). If the viscosity of the ink composition is within the above range, the ink flowability when used in writing instruments such as markers can be improved, and the writeability to non-permeable recording media such as membranes can also be improved.

[0126] As described above, in this embodiment, the writing part 3 of the writing instrument 1 is equipped with a central plug (valve) 3a consisting of a valve port 5a of a valve seat member 5 and a valve core 6c of a valve core member 6 (see reference). Figure 5 (B)

[0127] Therefore, by pressing the writing surface 7 against the writing surface, the valve stem 6d of the valve core component 6 can be pushed back against the force of the spring body 6b by the writing surface 7. As a result, the seal of the valve core 6c on the valve port 5a is released, and the ink in the container body 2 is supplied to the writing surface 7 through the valve opening plug 3a and absorbed. Then, the ink seeps out from the writing surface 7 towards the writing surface, thereby enabling writing.

[0128] Figure 12 Examples illustrating the usage of the writing instrument 1 of the present invention are shown below. In example (A), writing is performed with the bottom 2a of the container body 2 facing upward relative to the vertical writing surface 15, and in example (B), writing is performed with the bottom 2a of the container body 2 facing downward relative to the vertical writing surface 15.

[0129] In such Figure 12 As shown in (A), when writing with the bottom 2a of the container body 2 facing upward relative to the vertical writing surface 15, sufficient ink can be supplied to the writing surface 7 located at the opening 2c of the container body 2. This allows for the suppression of poor handwriting such as blurring and skipped lines.

[0130] In addition, in such Figure 12 As shown in (B), when writing with the bottom 2a of the container body 2 facing downwards relative to the vertical writing surface 15, the ink supply to the writing surface 7 can be restricted. This allows for the production of strokes (lines) that are less blurred.

[0131] Furthermore, in the described embodiment, the writing part 3 installed on the opening 2c of the container body 2 has a structure with a stopper (valve) 3a including a valve port 5a and a valve core 6c. However, the writing tool of the present invention does not necessarily require the stopper, and a direct-liquid writing tool in which the ink in the container body 2 directly permeates the writing body 7 can also be used.

[0132] then, Figures 13-27 This example illustrates the addition of a writing unit, which is detachably mounted as an accessory to the writing instrument 1. This writing unit is capable of receiving ink seeping from the writing surface 7 of the writing instrument 1 and supplying the ink to the writing surface.

[0133] first, Figures 13-16 This example illustrates a first additional writing unit installed as an accessory on a writing instrument 1. This first additional writing unit consists of a roller writing unit 21 installed at the opening 2c of the container body of the writing instrument 1.

[0134] like Figure 13 and Figure 14As shown, the roller writing unit 21 includes: a retainer 22, which is installed at the opening 2c of the container body 2 of the writing instrument 1; a support rod 23, which is locked to the retainer 22; a writing roller 24, which is supported by the support rod 23 and is rotatable; and an ink delivery roller 25, which is located between the writing roller 24 and the retainer 22, and delivers ink supplied from the writing instrument 1 side to the writing roller 24 side.

[0135] like Figure 16 As shown in the single-piece structure, the retainer 22 is integrally molded from resin raw material. The front half of the retainer 22 has an arc-shaped recess 22a for receiving the ink transfer roller 25, and the rear half of the retainer 22 is formed into a cylindrical shape with an internal thread 22b applied to its inner circumferential surface.

[0136] The internal thread 22b and the external thread 2e applied to the opening 2c of the container body of the writing instrument 1 (see reference) Figure 3 The threaded connection allows the retainer 22 to be detachably mounted on the mouth 2c of the writing instrument 1.

[0137] On the inner bottom surface of the recess 22a applied to the front surface side of the retainer 22, five openings 22c are formed in a straight line, each opening 22c penetrating the back side of the retainer 22. Furthermore, a small protrusion 22d is applied in such a manner that it surrounds the central opening 22c on the back side (see reference). Figure 16 [E]

[0138] The small protrusion 22d functions as follows: by installing the retainer 22 onto the opening 2c of the container body, the small protrusion 22d pushes the valve core component 6 back with the aid of the writing surface 7 of the writing instrument 1, causing the central plug 3a [refer to...] Figure 5 (B) Open the valve. Thus, ink from the writing instrument 1 is supplied to the roller writing unit 21 via the writing body 7.

[0139] A straight opening connecting groove 22e is provided in the recess 22a of the retainer 22 to connect five openings 22c, and an arcuate groove 22f is provided along the recess 22a at each opening 22c in a manner that intersects with the opening connecting groove 22e. The opening connecting groove 22e and each arcuate groove 22f function to uniformly supply ink supplied from the writing instrument 1 to the ink transfer roller 25 housed in the recess 22a.

[0140] In addition, on both outer sides of the recess 22a of the retainer 22 along the length direction, a pair of parallel locking protrusions 22g are formed in the front-rear direction of the retainer 22, and a locking groove 22h is formed between the pair of locking protrusions 22g for the support rod 23 to be inserted and installed.

[0141] The support rod 23 is formed by bending a round metal raw material into the shape of the Japanese kana character コ, with its central bend 23a bent into an arc shape. This arc-shaped central bend 23a is arranged along the side of the retainer 22.

[0142] Furthermore, the top ends of each leg 23b of the support rod 23 supported by the locking groove 22h are bent inwards towards each other, as... Figure 13 As shown, its curved portion 23c is inserted into the shaft hole 24a of the writing roller 24, and the writing roller 24 is supported by the shaft so that it can rotate.

[0143] Furthermore, an ink delivery roller 25, which has a smaller diameter than the writing roller 24, is housed within the recess 22a formed in the retainer 22. The ink delivery roller 25 is prevented from falling off the retainer 22 by abutting against the writing roller 24 on its front surface side, and is held by the retainer 22 to be able to rotate.

[0144] The ink delivery roller 25 is formed from a soft material, such as a rubber sponge, that can be impregnated with ink. Alternatively, the writing roller 24 can preferably be made of a material such as felt wound around the outer periphery of a cylindrical substrate.

[0145] Furthermore, by making the writing roller 24 of the roller writing unit 21 face downward and rolling the writing roller 24 against the writing surface, ink from the writing tool 1 can be supplied to the writing roller 24 via the ink transfer roller 25 that utilizes the rolling of the writing roller 24. Thus, the writing surface can be written on using the overall width of the writing roller 24 in the longitudinal direction.

[0146] Figures 17-19 This example illustrates a second additional writing unit installed as an accessory on the writing instrument 1. This second additional writing unit consists of a coarse brush unit 31 installed at the opening 2c of the container body of the writing instrument 1.

[0147] like Figure 17 and Figure 18 As shown, the coarse brush unit 31 is constructed by mounting a retainer 32 and a writing brush 33. The retainer 32 is detachably mounted on the opening 2c of the container body 2 of the writing instrument 1. The writing brush 33 is shaped into a prism by binding natural or chemical fibers to the top of the retainer 32.

[0148] like Figure 19 As shown in the single-piece structure, the retainer 32 is integrally molded from resin raw material. The front half of the retainer 32 has a mounting opening 32a for the writing brush 33, and the rear half of the retainer 32 is formed into a cylindrical shape with an internal thread 32b applied to the inner circumferential surface of the cylinder.

[0149] The internal thread 32b and the external thread 2e applied to the opening 2c of the container body of the writing instrument 1 (see reference) Figure 3 The threaded connection allows the retainer 32 to be detachably mounted on the mouth 2c of the writing instrument 1.

[0150] The writing brush 33 mounting opening 32a, which is rectangularly formed on the front surface of the retainer 32, has three openings 32c at its bottom, each opening 32c extending to the back side of the retainer 32. Furthermore, a small protrusion 32d is provided around the central opening 32c on the back side (see reference). Figure 19 [E]

[0151] The small protrusion 32d functions as follows: by installing the retainer 32 onto the opening 2c of the container body, the small protrusion 32d pushes the valve core component 6 back with the aid of the writing surface 7 of the writing instrument 1, causing the middle plug 3a (refer to...) Figure 5 (B)) Open valve. Thus, ink from writing instrument 1 is supplied to the coarse brush unit 31 side via writing body 7.

[0152] The base end of the writing brush 33, which is formed by bundling natural or chemical fibers into a prismatic shape, is embedded and mounted in the brush mounting port 32a, which is formed in a rectangular shape on the front surface side of the retainer 32. In this case, the mounting strength of the writing brush 33 relative to the retainer 32 can be improved by using an adhesive as needed.

[0153] In this embodiment, by positioning the writing brush 33 of the coarse brush unit 31 downwards, ink from the writing instrument 1 is supplied to the writing brush 33 via the opening 32c applied to the retainer 32. Thus, the writing surface can be written on using the writing brush 33.

[0154] Furthermore, the writing brush 33 described herein uses a writing brush that is formed by binding natural or chemical fibers into a prismatic shape. However, the same effect can also be achieved by forming a continuous bubble-like rubber sponge or the like into a prismatic shape instead of natural or chemical fibers and using it as the writing brush 33.

[0155] Figures 20-24 This example illustrates a third additional writing unit installed as an accessory on the writing instrument 1. This third additional writing unit consists of a fine brush unit 41 installed at the opening 2c of the container body of the writing instrument 1.

[0156] like Figure 20 and Figure 21 As shown, the fine brush unit 41 consists of a first set of retainers 42 to a third set of retainers 44 and a writing brush 45. The first set of retainers 42 to a third set of retainers 44 are detachably mounted on the opening 2c of the container body 2 of the writing instrument 1. The writing brush 45 is mounted on the top end by means of each set of retainers 42 to 44, and natural or chemical fibers are bundled together to form a fine, round brush shape.

[0157] If the first retaining member 42 to the third retaining member 44 are unfolded, they can be represented by a single-piece structure. Figure 23 and Figure 24 As shown, the first retainer 42 to the third retainer 44 are respectively formed from resin raw materials.

[0158] Furthermore, in the first retainer 42, an opening with an internal thread 42a is formed at the center of the front surface side, and the back surface side is cylindrical, with a large-diameter internal thread 42b applied to its inner circumferential surface. This internal thread 42b connects with the external thread 2e applied to the opening 2c of the container body of the writing instrument 1 (see reference). Figure 3 The fine brush unit 41 is detachably mounted on the mouth 2c of the writing instrument 1 via a threaded connection.

[0159] The second retainer 43 includes a shaft 43b with a central hole 43a, a short cylindrical body 43c surrounding the shaft 43b in its front half, and an internal thread 43d applied to the inner circumferential surface of the cylindrical body 43c. Additionally, an external thread 43e is applied to the shaft 43b, which protrudes into the rear half of the second retainer 43.

[0160] Furthermore, the third retainer 43 has a shaft hole 44a, which houses and supports the writing brush 45, which is made of a fine, round brush and will be described later. The front half of the third retainer 43 is formed into a tapered shape that tapers slightly towards the top. In addition, external threads 44b are applied to the outer periphery of the rear half of the third retainer 43.

[0161] In addition, as mentioned above, the writing brush 45 is formed by bundling natural or chemical fibers into a pointed round brush shape (so-called bullet shape), and an ink inlet hole 45a is formed along the axis in its rear half.

[0162] Figure 22 This indicates the state in which the first to third retaining members 42 are connected, and a writing brush 45 is mounted at the top, thus assembling as a fine brush unit 41. Based on Figure 24 An example of its assembly process is given.

[0163] First, the external thread 43e applied to the second retainer 43 is threaded into the internal thread 42a formed in the center of the front surface of the first retainer 42, thereby connecting the second retainer 43 to the first retainer 42.

[0164] Next, the tip of the writing brush 45 is inserted into the shaft hole 44a from the rear side of the third retainer 44, and the external thread 44b applied to the third retainer 44 is threaded into the internal thread 43d applied to the cylinder 43c of the second retainer 43. Thus, the third retainer 44 can be connected to the second retainer 43.

[0165] Through this connection operation, the writing brush 45 inside the third retainer 44 is pressed into the shaft hole 44a of the third retainer 44 by the top end of the shaft body 43b of the second retainer 43. As described above, the shaft hole 44a of the third retainer 44 is formed into a tapered shape that tapers slightly towards the top end, so the top end of the writing brush 45 protrudes from the third retainer 44, and the rear half of the writing brush 45 is installed in the shaft hole 44a of the third retainer 44 without loosening.

[0166] As described above, the fine brush unit 41 assembled according to the above steps is connected by the internal thread 42b applied to the first retainer 42 and the external thread 2e applied to the opening 2c of the container body of the writing instrument 1 (see reference). Figure 3 ) Threaded connection, thus mounting to writing instrument 1.

[0167] At this time, as Figure 22 As shown in (B), the rear end of the shaft 43b of the second retainer 43 protrudes within the first retainer 42. The rear end of the shaft 43b pushes the valve core member 6 back with the help of the writing body 7 of the writing instrument 1, thereby causing the middle bolt 3a [see reference]. Figure 5 (B) The valve opening method plays a role.

[0168] Therefore, ink from the writing instrument 1 is supplied to the fine brush unit 41 via the writing body 7, and ink is supplied to the writing brush 45 via the shaft hole 43a of the second retainer 43 and the ink inlet hole 45a applied to the writing brush 45. Thus, the writing surface can be written on using the writing brush 45.

[0169] Furthermore, the writing brush 45 uses a writing brush that is formed by bundling natural or chemical fibers into a pointed round brush shape. However, the same effect can be achieved by forming a continuous bubble-like rubber sponge or the like into a pointed round brush shape instead of natural or chemical fibers and using it as the writing brush 45.

[0170] Figures 25-27 This example illustrates a fourth additional writing unit installed as an accessory on the writing instrument 1. This fourth additional writing unit consists of a sputtering unit 51 installed at the opening 2c of the container body of the writing instrument 1.

[0171] The sputtering unit 51 consists of a unit holder 52 detachably mounted to the opening 2c of the container body 2 of the writing instrument 1 and a handheld milling machine 54 mounted on the unit holder 52 and positioning the rotating brush 53 near the opening 2c of the container body 2.

[0172] like Figure 27 As shown in (B), the unit retainer 52 is molded from resin raw material into an integral L-shape, with a cylindrical portion 52a formed at its top. An internal thread 52b is applied to the inner circumferential surface of the cylindrical portion 52a. An external thread 2e (see reference) is threaded into the opening 2c of the container body of the writing instrument 1 via the internal thread 52b. Figure 3 This allows the writing instrument 1 to be mounted on the unit retainer 52 (see reference). Figure 26 ).

[0173] Additionally, a mounting opening 52c for a handheld milling machine 54 is formed at the bottom of the unit holder 52, which is bent into the shape of the letter L. The rotating brush 53 of the handheld milling machine 54, which is mounted in the opening 52c, is positioned in front of the cylindrical portion 52a of the unit holder 52.

[0174] A metal mesh 52d is disposed on the front surface side of the cylindrical portion 52a formed in the unit retainer 52, and the metal mesh 52d is supported by a pressing ring 52e screwed in from the front surface side of the cylindrical portion 52a.

[0175] Furthermore, on the pressing ring 52e, with the rotating brush 53 as the center, an umbrella-shaped portion 52f protruding towards the front surface of the metal mesh 52d is integrally formed on one side of the pressing ring 52e, and a slit-shaped opening portion 52g (see reference) is formed on the other side of the pressing ring 52e in a manner flush with the front surface of the metal mesh 52d. Figure 25 ).

[0176] The handheld milling machine 54 has an outer contour that is slender and cylindrical. Its bottom forms a battery case 54a for storing dry batteries, and a storage chamber 54b for a micro motor is formed at the top of the battery case 54a. Furthermore, the rotating brush 53 is mounted on the top end of the rotating drive shaft 54c of the micro motor, which is located above the storage chamber 54b of the micro motor.

[0177] Furthermore, in this embodiment, the handheld milling machine 54 is mounted on the unit holder 52 by embedding the micro motor housing 54b into the handheld milling machine mounting opening 52c.

[0178] In the sputtering unit 51, as described above, the writing instrument 1 can be mounted on the unit holder 52 by threading the external thread 2e of the opening 2c of the container body of the writing instrument 1 with the internal thread 52b formed in the cylindrical portion 52a of the unit holder 52.

[0179] As described above, with the writing instrument 1 installed in the sputtering unit 51, the metal mesh 52d disposed in the unit holder 52 pushes the valve core member 6 back using the writing body 7 of the writing instrument 1, causing the middle plug 3a [refer to...] Figure 5 (B) Open the valve. As a result, ink from the writing instrument 1 seeps out through the writing body 7 to the metal mesh 52d side.

[0180] In this state, the handheld milling machine 54 is rotated by driving the micro motor, and when viewed from the top side, the rotating brush 53 mounted on the top of the rotating drive shaft 54c rotates to the right (clockwise).

[0181] As a result, the tip of the rotating brush 53 expands circumferentially under centrifugal force, and a portion of the rotating brush 53 rotates while in contact with the surface of the metal mesh 52d. Consequently, the ink that has seeped into the side of the metal mesh 52d is splashed (splashed) in the direction along the surface of the metal mesh 52d, enabling the writing surface to be drawn in a spot-like, individual manner.

[0182] Furthermore, in the sputtering unit 51, as described above, a slit-shaped opening 52g is formed on the pressing ring 52e that presses the metal mesh 52d on the front surface side. This slit-shaped opening 52g can reduce the degree to which it hinders the flight of ink droplets splashing along the surface direction of the metal mesh 52d, thus facilitating the normal sputtering action of the ink.

[0183] Figures 28-36 This refers to the writing section replacement unit 61 of the present invention, which is detachably mounted on... Figures 1-12 The writing instrument 1 shown has a container body 2 with an opening 2c. Furthermore, the writing part replacement unit 61 functions in a way that allows the writing part 3 installed in the opening 2c to be easily detached.

[0184] like Figure 28 and Figure 29 As shown, the writing section replacement unit 61 consists of a writing section disassembly cap component 62, a writing section pull-out component 63, a flexure suppression rod 64, and a spiral spring 65.

[0185] Figure 30 This describes the single-piece structure of the cap member 62 for removing the writing part. The cap member 62 for removing the writing part has an opening 62b at the center of the top surface 62a. One end of the writing part pull-out member 63, which is pulled out from the outside of the top surface 62a, is inserted into the opening 62b.

[0186] Furthermore, a number of knurling 62c that are grooved along the axial direction are continuously applied to the outer peripheral surface of the cap member 62 for disassembling the writing part.

[0187] Furthermore, an internal thread 62d is applied to the inner circumferential surface of the opening side of the cap member 62 for disassembling the writing part, and an annular protruding ring 62e is formed axially on the back side of the top surface 62a on the inner side of the internal thread 62d.

[0188] That is, the cap component 62 for disassembling the writing section is based on Figure 11 An opening 62b is provided at the center of the top surface 4a of the cap component 4 described herein. The other structures, except for the opening 62b, are similar to... Figure 11 The structure of the cap component 4 shown is the same.

[0189] Figure 31 This describes the single-piece structure of the writing section pull-out member 63. The main part of this writing section pull-out member 63 consists of a cylindrical shaft 63a. At one end of this shaft 63a, at a 180-degree angle to each other on the cylindrical wall, a pair of slits 63b are applied axially from the end. Thus, at one end of the writing section pull-out member 63, a flexible portion 63c, capable of flexing towards the axial direction, is applied in a flexural state.

[0190] In addition, a locking portion 63d with a diameter that is larger than that of the shaft 63a is formed at the top end of the flexural portion 63c, and a tapered portion 63e with a diameter that is smaller toward the top end is applied to the locking portion 63d.

[0191] Additionally, at the other end of the writing section pull-out member 63, an annular flange 63f is formed in a direction orthogonal to the axis. A shaft hole 63g communicating with the cylindrical shaft body 63a is provided on the flange 63f (see reference). Figure 28 ).

[0192] Figure 28 This describes the single-piece structure of a flexure-suppressing rod 64, which has a cylindrical shaft 64a with a fixed diameter in the axial direction and a disc-shaped head 64b located at the end of the shaft 64a.

[0193] The shaft 64a is configured to be inserted into the shaft hole 63g of the writing part pull-out member 63 with a slight gap. Furthermore, the length of the shaft 64a is set such that when the shaft 64a is inserted with the head 64b of the deflection inhibition rod 64 in contact with the flange 63f of the writing part pull-out member 63, the tip of the shaft 64a reaches the tip of the end of the writing part pull-out member 63 (see reference). Figure 29 (D)]

[0194] According to this structure, the flexural portion 63c of the writing part pull-out member 63 is prevented from flexing in the axial direction.

[0195] Figure 28 This describes the single-piece structure of a helical spring 65, which is mounted to surround the writing part pull-out member 63. In this case, the spring 65 is mounted from the tapered portion 63e side of the writing part pull-out member 63 toward the flange portion 63f side at the other end.

[0196] Furthermore, by inserting the tapered portion 63e of the writing part pull-out member 63 (without the deflection suppression rod 64 installed) from the top surface 62a side into the opening 62b of the writing part disassembly cap member 62, the locking portion 63d is inserted into the opening 62b while deflecting towards the axis.

[0197] Thus, the spring 65 is installed between the top surface 62a of the writing part removal cap member 62 and the flange portion 63f of the writing part removal member 63 in such a way that it surrounds the writing part pull-out member 63.

[0198] Furthermore, the locking part 63d of the writing part pull-out member 63 is located inside the writing part removal cap member 62 and is locked to the opening 62b. Therefore, the locking part 63d functions as an anti-detachment member to prevent the writing part pull-out member 63 from falling off the writing part removal cap member 62.

[0199] Figures 32-36 The operation of installing the writing part replacement unit 61 configured as described above into the opening 2c of the container body 2 of the writing instrument 1 and removing the writing part 3 installed in the opening 2c will be explained in turn.

[0200] first, Figure 32 This indicates the initial state in which the writing unit replacement unit 61 is installed in the opening 2c of the container body 2. When the writing unit replacement unit 61 is installed in the opening 2c of the container body 2, the opening 2c of the container body 2... Figure 5 The writing part 7 in the writing part 3 shown is cut into the center to form a cut-out part 7h. This cut-out part 7h is intended to be an opening into which the top end of the writing part pull-out member 63 can be inserted.

[0201] Next, with the self-writing part pull-out component 63 removed and the deflection restraint rod 64 disassembled, as follows: Figure 33 As shown, the cap member 62 for disassembling the writing part is threadedly engaged with the opening 2c of the container body 2. In this state, by overcoming the elastic force of the spring 65, the writing part pull-out member 63 is pressed into the writing part disassembly cap member 62, causing the tapered portion 63e formed at the top of the writing part pull-out member 63 to bend axially in the direction of the flexure portion 63c, and enter the valve port 5a of the writing part 3 (see reference). Figure 5 (B)) inside.

[0202] As a result, the locking part 63d of the writing part pull-out member 63 is inserted into the valve seat member 5 of the writing part 3, the conical part 63e flexes back in the axial direction, and the locking part 63d is locked in the valve port 5a of the writing part 3.

[0203] like Figure 34 As shown, by inserting a deflection suppression rod 64 into the shaft hole 63g of the writing part pull-out member 63 and loosening the threaded connection of the writing part disassembly cap member 62, which is threadedly connected to the opening 2c of the container body 2, the writing part disassembly cap member 62 gradually leaves the opening 2c of the container body 2.

[0204] On the other hand, since a deflection suppression rod 64 is inserted into the writing part pull-out member 63, the locking part 63d remains locked at the valve port 5a. Consequently, the spring 65 contracts axially, and the adjacent coil abuts, thereby stopping the contraction of the spring 65. Thus, the locking part 63d of the writing part pull-out member 63 pulls the writing part 3 out from the opening 2c of the container body 2.

[0205] Figure 35 This indicates that the writing part 3 is pulled out from the opening 2c of the container body 2 by the traction action. At this time, the writing part disassembly cap member 62 is disengaged from the opening 2c of the container body 2 which is threaded together, and the writing part 3 is locked and installed on the writing part pull-out member 63 side of the writing part replacement unit 61.

[0206] In this state, the self-writing part pull-out member 63 pulls out the deflection suppression rod 64, and then... Figure 36 As shown, the self-writing part removal cap member 62 pulls out the writing part pull-out member 63, thereby removing the writing part 3 from the writing part 3.

[0207] In this case, the locking part 63d formed in the writing part pull-out member 63 is as follows: Figure 5 As shown, the valve port 5a, which is formed in a cone shape, is locked in place. Therefore, when the deflection inhibition rod 64 is pulled out, the locking part 63d can easily bend in the axial direction using the cone-shaped valve port 5a under the action of the deflection part 63c. Thus, the writing part 3 can be easily removed from the writing part pull-out member 63.

[0208] According to the writing part replacement unit 61, the writing part 3 can be easily removed from the container body 2 when the writing part 7 of the writing part 3 is worn out or when the ink in the container body 2 is exhausted and needs to be replenished. Moreover, by installing a new writing part 3 at the opening 2c of the container body 2, it is possible to facilitate the continued use of the writing instrument.

[0209] Explanation of reference numerals in the attached figures

[0210] 1. Writing instrument; 2. Container body; 2a. Bottom; 2b. Torso; 2c. Mouth; 2d. Finger hook recess; 3. Writing part; 3a. Central plug (valve); 4. Cap component; 4a. Top surface; 5. Valve seat component; 5a. Valve port; 5e. Annular locking part; 6. Valve core component; 6b. Spring body; 6c. Valve core; 6d. Valve stem; 7. Writing part; 7a. Spherical protrusion; 7h. Cut-off part; 8. Writing part support ring; 9. Stirring ball; 11. Packaging sheet; 11a. Body side sheet; 11b. Cap side peeling sheet; 11 c. Crack; 15. Writing surface; 21. First additional writing unit (roller writing unit); 31. Second additional writing unit (coarse brush unit); 41. Third additional writing unit (fine brush unit); 51. Fourth additional writing unit (splashing unit); 61. Writing part replacement unit; 62. Writing part disassembly cap component; 62b. Opening; 63. Writing part pull-out component; 63c. Deflection part; 63d. Locking part; 63g. Shaft hole; 64. Deflection suppression rod; 64a. Shaft; 64b. Disc-shaped head; 65. Helical spring.

Claims

1. A writing instrument comprising: a container body for holding writing ink; a writing surface disposed to close the opening of the container body; and a cap member detachably attached to the opening and covering the writing surface, wherein writing is permitted on the writing surface by allowing ink from the container body to seep out from the writing surface, the writing instrument being characterized in that... The container body has a bottom, a body that is continuous with the bottom and rises upwards, and a mouth that is continuous with the body and rises obliquely upwards. The angle between the axis of the container body orthogonal to the bottom surface of the container body and the axis of the opening passing through the center of the opening forms an obtuse angle. The writing section is formed by a single-piece valve core component. The valve core component is integrally molded from elastic synthetic resin and has three spring bodies extending spirally upward from the annular body.

2. The writing instrument according to claim 1, characterized in that, The container body contains a stirring ball for writing ink, the diameter of which is larger than the opening diameter of the writing part that supports the writing body and is installed at the mouth, facing inwards from the container.

3. The writing instrument according to claim 1 or 2, characterized in that, The writing instrument, which is installed in a manner that closes the opening, is made of a soft foam material.

4. The writing instrument according to claim 1, characterized in that, Titanium oxide is mixed into the writing ink.

5. The writing instrument according to claim 1, characterized in that, The container body and the cap member installed at the opening of the container body are covered by a packaging sheet in a tightly fitted state. A slit is applied to the packaging sheet, allowing a portion of the packaging sheet covering the cap member to be peeled off. The crack is formed parallel to the bottom of the container body along the smallest cross-sectional portion of the container body between the torso and the mouth.

6. The writing instrument according to claim 1, characterized in that, An additional writing unit is detachably installed at the opening of the container body as an accessory. This additional writing unit receives ink that seeps out from the writing surface and can supply the ink to the writing surface.

7. A writing part replacement unit, wherein the writing part replacement unit is the writing part replacement unit of the writing instrument according to claim 1, characterized in that, The writing section replacement unit has the following features: A cap component for disassembling the writing section is threadedly engaged with the opening of the container body and has an opening on its top surface; The writing part pull-out member is formed in a cylindrical shape, with one end inserted into the opening of the writing part disassembly cap member. A flexural part is applied to the one end, which flexes in the axial direction, and a locking part is formed in the flexural part that can lock with the writing part installed at the mouth of the container body. A deflection suppression rod, which is inserted into the axial hole of the cylindrical writing part pull-out member, thereby suppressing the deflection of the deflection part in the axial direction; as well as A spring is mounted between the top surface of the writing part removal cap member and the other end of the writing part pull-out member in such a way that it surrounds the writing part pull-out member.

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