JP2004066478A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing utensil, an ink exhaustion sign of which can be easily and surely detected visually in a twin type writing utensil, in which a pen point serving as a writing part is equipped at both the sides of a barrel so as to supply ink for writing utensil such as water-based ink and oil-based ink impregnated in an ink occlusion body in the barrel. <P>SOLUTION: This writing utensil is a twin type writing utensil A having pen points 50 and 60 functioning as a writing part at both sides of the barrel and supplying ink contained in an ink occlusion body 20 in the barrel 10 to each of the pen points 50 and 60, and the ink contained in the ink occlusion body 20 is supplied through ink guiding tubes 30 and 40 having visual recognizability to each of the pen points 50 and 60. The ink exhaustion sign from the ink occlusion body 20 is detected by visually recognizing the ink guiding tubes 30 and 40 through each of the visually recognizing parts 12 and 13 formed respectively in the barrel 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a twin-type writing instrument that includes a pen tip serving as a writing section on both sides of a barrel and supplies ink impregnated in the ink occluding body in the barrel to each pen tip. The present invention relates to a writing implement having a structure that can easily detect the end sign of ink.
[0002]
[Prior art]
Description of the Related Art Conventionally, as a writing instrument capable of knowing the remaining amount of ink and the end sign of ink, there are, for example, a direct liquid writing instrument having a collector structure in which liquid ink is directly accommodated in a shaft body, and an ink container tube in which ink is a cartridge type. There is known a writing instrument having a structure accommodated in a ballpoint pen, a type in which a transparent refill is filled with ink for a ballpoint pen, and the like.
[0003]
By the way, a pen portion serving as a writing portion is provided on both sides of the barrel, and ink for a writing implement such as an aqueous ink or an oil-based ink impregnated in the ink occluding body in the barrel is supplied to each pen tip serving as a writing portion. At present, there is no twin-type so-called batting-type writing implement having a mechanism capable of detecting the ink end signature.
Therefore, with a writing instrument of this structure, the end of the ink can be known only when the ink is used during writing until the ink is worn out, and then the ink is reused by discarding or refilling the ink. Since it is also caused by drying, etc., if there is enough ink impregnated in the ink occluding body and the pen tip is worn out due to drying, etc., it is not an end sign of the original ink but there is a problem in usability etc. Things.
[0004]
On the other hand, Japanese Unexamined Patent Publication No. Hei 6-270585 discloses that a batting serving as an ink occluding body is stored in a transparent shaft cylinder, and the ink impregnated in the batting is supplied to a nib serving as a writing portion. A writing implement that allows the contents of the writing implement to be visually recognized from the pen to the pen tip is disclosed.
However, in the writing implement of this structure, if the amount of ink absorbed in the batting becomes small, a certain amount of ink remaining can be confirmed by the degree of the ink color absorbed, but the sign of the end of the ink is surely obtained. This writing instrument has problems in usability and the like.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the problems and the current state of the prior art described above, and is intended to solve the problem. The present invention includes a pen tip serving as a writing portion on both sides of a barrel, and is impregnated in an ink occluding body in the barrel. An object of the present invention is to provide a writing implement that can easily and reliably detect the end sign of ink in a writing implement that supplies ink for a writing implement such as a water-based ink, an oil-based ink, or the like to each pen tip serving as a writing section. And
[0006]
[Means for Solving the Problems]
The present inventors have conducted intensive studies on the above-mentioned problems of the related art, etc., and as a result, provided with a pen tip as a writing part on both sides of a shaft cylinder as a writing part, and impregnated in the ink occlusion body in the shaft cylinder. The writing implement of the above-mentioned object can be obtained by making the configuration of the barrel of the twin-type writing implement that supplies ink to each pen tip, and the mechanism that supplies ink from the ink occluding body to the pen tip have a specific construction and the like. Thus, the present invention has been completed.
[0007]
That is, the writing implement of the present invention resides in the following (1) to (19).
(1) A twin-type writing implement comprising a pen tip serving as a writing section on both sides of a barrel and supplying ink impregnated in the ink occluding body in the barrel to each of the pens. The ink impregnated in the ink is supplied to each pen tip through an ink guide tube having visibility, and the ink end sign from the ink occluding body is formed on each barrel through each visual portion formed on the barrel. A writing implement for detecting by visually checking the ink guide tube.
(2) The writing implement according to the above (1), wherein there is one ink occluding body in the barrel.
(3) The writing implement according to the above (1) or (2), wherein the inside of the barrel is isolated, and each of the isolated barrels contains an ink occluding body.
(4) Each pen tip provided on both sides of the barrel is one selected from a felt pen core, a sliver core, a ballpoint pen, a fiber bundle core, a sintered core, a fountain pen, and a brush, and each pen tip has the same mechanism or The writing implement according to any one of the above (1) to (3), comprising a different mechanism.
(5) The writing implement as described in any one of (1) to (4) above, wherein the ink impregnated in the ink occluding body is supplied to the ink guide tube via a relay core.
(6) The writing instrument according to the above (5), wherein a joint between the ink guide tube and the relay core is closed to the outside air.
(7) The ink according to the above (5) or (6), wherein the ink supplied to the ink guide tube having visibility by the relay core is further supplied to the pen tip via the pen tip relay core. Writing implement.
(8) The capillary force of the capillary formed by the ink guide tube, the ink occluding body, the relay core, the pen tip, and the junction between the ink guide tube and the relay core is the joint between the ink guide tube and the relay core> pen tip. The writing implement according to the above item (5), wherein the relation:> relay core> ink occluding body> ink guide tube.
(9) Any one of the above (1) to (8), wherein the surface tension of the surface of the ink guide tube which has visibility and which is in contact with the ink or the material itself of the ink guide tube is smaller than the surface tension of the ink. Writing instrument described in one.
(10) The writing implement as described in any one of (1) to (9) above, wherein the distribution of the capillary force of the ink occluding body increases toward the pen tip side.
(11) The writing implement as described in any one of (1) to (10) above, wherein the inner diameter of the barrel becomes narrower toward the pen tip side.
(12) The writing instrument according to any one of (1) to (11), wherein a rib body is formed in a plurality of axial directions inside the pen tip side of the barrel.
(13) The relay core is composed of any one of a fiber bundle core, a resin particle porous body, and a sliver core, and these relay cores have a continuous flow path, so that the apparent cross-sectional area of the ink guide tube is substantially maintained. The writing instrument according to any one of the above (1) to (12), wherein the cross-sectional area of the ink flow path flowing through the ink guide tube can be controlled.
(14) The apparent cross-sectional area of the ink guide tube is maintained by placing a rod-shaped or tubular body having a smaller surface tension than the ink and having a different color from the ink into the ink guide tube having ink visibility in parallel with the ink guide tube. The writing implement according to any one of the above (1) to (13), wherein the cross-sectional area of the ink flow path flowing through the ink guide tube can be substantially controlled as it is.
(15) The writing implement as described in any one of (1) to (14) above, wherein a plurality of ink guide tubes are formed.
(16) The writing implement as described in any one of (1) to (15) above, wherein the length of the visible portion of the barrel is 1 mm or more and less than or equal to the total length of the writing implement.
(17) The cross-sectional area of the ink flow path of the ink guide tube is 0.8 to 80 mm ² The writing instrument according to any one of the above (1) to (16), wherein
(18) The writing implement as described in any one of (1) to (17) above, wherein the surface tension of the ink is 18 mN / m or more at 25 ° C.
(19) The writing implement as described in any one of (1) to (18) above, wherein the viscosity coefficient of the ink at 25 ° C. is 200 mPa · s or less.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The writing implement of the present invention is a twin-type writing implement that includes a pen tip serving as a writing section on both sides of the barrel and supplies ink impregnated in the ink occluding body in the barrel to each pen tip. The ink impregnated in the ink occluding body is supplied to each pen tip through an ink guide tube having visibility, and an ink end sign from the ink occluding body is formed via each visual portion formed on the barrel. The detection is performed by visually recognizing each of the ink guide tubes.
[0009]
FIGS. 1 to 3 show a twin-type writing instrument according to a first embodiment of the present invention, which is suitably used as a felt-tip pen (bold and fine), a marker (bold and fine), a marker for whiteboard (bold and fine), and the like. It can be applied.
As shown in FIGS. 1 and 3, the writing implement A according to the first embodiment includes a shaft cylinder 10 serving as a writing implement main body, an ink storage body 20, ink guide tubes 30, 40, and nibs 50, 60. The ink impregnated in the two ink occluding bodies 20 is supplied to a bold pen tip 50 and a thin pen tip 60 provided on both sides of the barrel 10.
The shaft cylinder 10 is made of, for example, a synthetic resin, and has a small diameter portion 10a, 10b having a tapered portion, and a large diameter portion 10c integrated at the tip end on both sides thereof. The small diameter portion 10a has a fitting portion 11a for fitting a pen point 50 for bold characters, and the other small diameter portion 10b has a fitting portion 11b for fitting a pen point 60 for small characters. And the large diameter portion 10c accommodates the ink occluding body 20 impregnated with the writing implement ink and the ink guide tubes 30 and 40, respectively.
[0010]
As shown in FIGS. 1 and 3, each of the distal ends of the large-diameter portion 10 c of the barrel 10 has a viewing portion 12, 13 made of a transparent or translucent body so that the inside of the barrel can be viewed. And the other parts are non-viewing parts by a separate member or the like.
Note that the entire barrel 10 may be made of a transparent or translucent material having visibility so that the entire barrel 10 can be visually recognized. Alternatively, it may be made of a translucent material, and portions other than the visible portions 12 and 13 may be non-visible portions as colored portions or decorative portions.
The entire length of each of the visible portions 12 and 13 may be a length that allows each of the ink guide tubes 30 and 40 held in the barrel 10 to be visually recognized from the visible portions 12 and 13. In the present embodiment, it is desirable that the length be equal to or less than the entire length of the barrel (preferably 5 mm or more). If the total length of the visible portions 12 and 13 is less than 1 mm, the detection of the ink end signature is difficult to visually recognize, and the detection function cannot be performed.
[0011]
The ink occluding body 20 is impregnated with an ink for writing implements such as an aqueous ink and an oil-based ink, and is, for example, a natural fiber, an animal hair fiber, a polyacetal resin, an acrylic resin, a polyester resin, a polyamide resin, a polyurethane resin. A fiber bundle formed of one or a combination of two or more of resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc. The cylinder 10 is accommodated in the shaft cylinder 20 by rear holders 21 and 22 that seal the respective front parts.
[0012]
As shown in FIG. 1, the ink guide tubes 30 and 40 serve as a tubular (tubular) ink flow path member having visibility, and for example, a transparent member made of resin, rubber, glass, or the like. It is made of a translucent member. Specifically, as the transparent or translucent resin, for example, polypropylene (PP), polymethylpentene, polyethylene (PE), cyclic polyolefin, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyamide, polystyrene, Polycarbonate, fluororesin and the like can be mentioned, and as the transparent or translucent rubber, silicone rubber and the like can be mentioned. In the present embodiment, each is made of PP or cyclic polyolefin.
The rear end portions 30a, 40a of the ink guide tubes 30, 40 penetrate the rear holders 21, 22, and communicate with the inside of the ink storage body 20, and the front end portions 30b, 40b are the small diameter portions 10a, It penetrates through each of the front holders 23 and 24 that seal the inside of 10b, and is fitted into the rear end portions of the pen tips 50 and 60. As a result, the ink guide tubes 30 and 40 form the barrel 10 by the rear holder 21 and the front holder 23 that seal the inside of the barrel 10, and the rear holder 22 and the front holder 24. Recognition space portions 14 and 15 are formed therein, respectively, and are held in the central portions of the recognition space portions 14 and 15, respectively.
[0013]
With this configuration, if the viewers 12 and 13 of the barrel 10 are viewed, the ink guide tubes 30 and 40 are easily viewed via the viewers 12 and 13. In addition, the ink impregnated in the ink occluding body 20 efficiently flows into each of the ink guide tubes 30 and 40 by capillary force, and is supplied to the nibs 50 and 60 through the ink guide tubes 30 and 40, respectively. Become.
The total length of the ink guide tubes 30 and 40 is appropriately set according to the type of the pen tips 50 and 60. Usually, the total length of the ink guide tubes is determined by the capillary force of the ink absorber 20, Since the length from the front end to the pen tips 50 and 60 is specified, it is specified within the range of the length. The cross-sectional area of each ink flow path of the ink guide tubes 30 and 40 is 0.8 to 80 mm in order to allow the ink to pass through the ink guide tubes 30 and 40 more smoothly and smoothly. ² , More preferably 0.5 to 20 mm ² It is desirable to do.
The cross-sectional area of this ink channel is 0.8mm ² If the amount is less than the above, the ink flow rate is small and the ink followability during writing is poor. On the other hand, 80 mm ² Is exceeded, the lengths of the ink guide tubes 30 and 40 cannot be made long, making it difficult to detect and visually recognize the end of the ink. In addition, 80mm ² Increasing the length of the ink guide tube with a cross-sectional area exceeding makes it easier to detect and visually recognize the end of ink.However, in this case, when writing with the pen tip downward, excess ink may flow out of the pen tip. Become.
[0014]
In order to supply the ink from the ink occluding body 20 to the pen tips 50 and 60 more smoothly and smoothly, the surfaces of the ink guide tubes 30 and 40 which have visibility and which are in contact with the ink or the ink guide tubes 30 are provided. , 40 is preferably smaller than the surface tension of the ink. When the surface of the ink guide tubes 30, 40 that is in contact with the ink is larger than the surface tension of the ink, the ink of the ink guide tubes 30, 40 is treated with a fluororesin treatment, silicone rubber, or silicone resin treatment. The contact surface may be smaller than the surface tension of the ink.
Further, as a cross-sectional shape of the ink guide tubes 30 and 40, for example, as shown in FIGS. 2A to 2J, a circular shape [FIG. 2A] or a triangular shape [FIG. )], A polygonal shape such as a square shape (FIG. 2 (c)), a pentagonal shape (FIG. 2 (d)), a hexagonal shape (FIG. 2 (e)), a rhombic shape (FIG. 2 (g)), or an ellipse. The shape (FIG. 2 (f)), the star shape (FIG. 2 (h)), the circular shape (FIG. 2 (i) or (j)) having a large number of V-grooves or projections inside, etc. The ink is not particularly limited as long as the ink is smoothly supplied from the ink occluding body 20 to the pen tips 50 and 60 and visibility is not hindered. The ink guide tubes 30 and 40 of the present embodiment have a circular cross-sectional shape.
[0015]
The nibs 50 and 60 are made of, for example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether. Fiber bundles made of one or a combination of two or more of such resins, polyphenylene resins, etc., are processed into fiber bundles such as felt, or these fiber bundles are resin-processed into fiber cores or various plastic powders. The pen tip is formed of a tied porous body or the like, and its shape is also selected according to the form of the writing instrument. That is, each pen tip 50, 60 provided on both sides of the barrel 10 is one selected from a felt pen core, a sliver core, a ballpoint pen, a fiber bundle core, a sintered core, a fountain pen, and a brush. It has the same mechanism or a different mechanism. In the present embodiment, it is composed of felt pen cores for bold and fine characters.
[0016]
The ink to be impregnated into the ink occluding body 20 is not particularly limited as long as it is an ink for writing implements such as a water-based ink and an oil-based ink each having a generally used composition, and is used for a writing pen, a marking pen, and a ball-point pen. And aqueous or oily liquid inks depending on the application, such as for whiteboards. Preferably, the surface tension of the ink is at least 18 mN / m at 25 ° C., more preferably 25 to 50 mN / m, for better detection of the end sign at the ink guide tubes 30 and 40. . The surface tension of the ink can be adjusted by adding a surfactant or the like to the ink composition as necessary.
Further, in order to more smoothly and smoothly supply the ink from the ink storage body 20 to the pen tips 50 and 60 through the ink guide tubes 30 and 40, the viscosity coefficient of the ink is preferably set to 25 ° C. Below 200 mPa · s, more preferably 1 to 10 mPa · s. When the viscosity coefficient of the ink exceeds 200 mPa · s, the fluidity of the ink deteriorates, and a sufficient amount of the ink does not flow out. The viscosity coefficient of the ink can be adjusted by adding a thickener or the like to the ink composition as needed.
[0017]
In the writing implement A of the first embodiment configured as described above, as shown in FIGS. 1 and 3, the ink impregnated in the ink occluding body 20 flows through the ink guide tubes 30 and 40 by the capillary force. Penetrating the pen points 50 and 60 to enable writing.
In the writing implement A of the first embodiment, the ink impregnated in the ink occluding body 20 is always supplied to the nibs 50 and 60 through the ink guide tubes 30 and 40, respectively. In the case where the ink impregnated in the body 20 is reduced and finished, it becomes apparent from the fact that there is no passage of the ink in the ink guide tubes 30 and 40.
That is, in the writing implement A of the present embodiment, the ink end sign from the ink storage body 20 can be detected by visually recognizing the ink guide tubes 30 and 40 via the visual recognition portions 12 and 13 formed on the barrel 10. You can do it. Therefore, it is possible to visually and easily determine whether the ink thinning at the tips 50 and 60 is due to the drying at the pen tips 50 and 60 or the original end due to the consumption of the ink. You can do it.
[0018]
In the present embodiment, in order to prevent the ink from being excessively supplied from the ink guide tubes 30 and 40 to the pen tips 50 and 60, and to prevent the ink from leaking from the pen tips 50 or 60, the pen tips 50 and 60 are used. An ink absorber may be provided on the outer periphery of the rear end portion of the 60. The ink absorber is disposed in the spaces 16, 17 formed on the outer periphery of the rear end portion of the pen tip 40 in the small diameter portion 10a.
[0019]
FIGS. 4A to 4C are modified examples of the first embodiment. FIG. 4A shows a form in which the distribution of the capillary force of the ink occluding body is increased toward the pen tips 50 and 60 on both sides of the barrel 10, for example, the gap between the fiber bundles constituting the ink occluding body 20 is the pen tip. It has a structure that becomes narrower toward the side, that is, a structure that includes a dense portion 20a and a fine portion 20b.
FIG. 4B shows a structure in which the inner diameter of the barrel 10 becomes narrower toward the pen tips 50 and 60 (a tapered shape), and the ink absorbing body 20 also becomes narrower toward the pen tip. .
FIG. 4C shows a structure in which ribs 10d, 10d,... Are formed in a plurality of axial directions inside the inner wall portion of the shaft cylinder 10 accommodating the ink occluding body 20.
By adopting each of the configurations of FIGS. 4A to 4C or a combination of them in the writing implement A of the first embodiment, the ink impregnated in the ink occluding body 20 further becomes an ink guide tube. The ink flows well into the insides 30 and 40 and is supplied to the nibs 50 and 60 well.
[0020]
FIG. 5 shows a second embodiment of the present invention. In the writing implement B of the second embodiment, each of the nibs 50a, 60a provided on both sides of the barrel 10 has a different mechanism, that is, a fiber bundle core for an underline and a sintered core for a felt-tip pen. This is different from the writing implement A of the first embodiment in that the fiber bundle core 50a for the line is held by a front shaft 10e fixed to the barrel 10. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the writing implement B of the second embodiment, as in the first embodiment, the ink impregnated in the ink occluding body 20 is smoothly supplied to the pen nibs 50a, 60a through the ink guide tubes 30, 40, and the ink is absorbed. Writing can be performed for lines and felt-tip pens. In addition, in the writing implement B, the ink end sign of the ink storage body 20 can be detected by visually recognizing the ink guide tubes 30 and 40 through the visual recognition portions 12 and 13 formed in the barrel 10.
Furthermore, the modified examples shown in FIGS. 4A to 4C may be applied to the writing implement B of the second embodiment (the same applies to the following embodiments).
[0021]
FIG. 6 shows a third embodiment of the present invention. The writing implement C of the third embodiment is different from the above-described pen in that each of the nibs 50b and 60b provided on both sides of the barrel 10 has a different mechanism, that is, a pen nib for a ball-point pen and a sintered core for a felt-tip pen. This is different from the writing implement A of the first embodiment. In FIG. 6, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
In the writing implement C of the third embodiment, similarly to the first embodiment, the ink impregnated in the ink occluding body 20 is smoothly supplied to the pen tips 50b and 60b through the ink guide tubes 30 and 40, and is supplied to the ballpoint pen. And writing on a felt-tip pen. Further, in the writing implement C, the ink end sign of the ink occluding body 20 can be detected by visually recognizing the ink guide tubes 30 and 40 through the visual recognition portions 12 and 13 formed on the barrel 10.
[0022]
FIG. 7 shows a fourth embodiment of the present invention. In the writing instrument D of the fourth embodiment, the pen tips 50c and 60c provided on both sides of the barrel 10 are formed of the same mechanism, that is, ball point pen tips having different ball diameters, for example, 0.1 mm and 0.5 mm. In this respect, it differs from the writing implement A of the first embodiment. In FIG. 7, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the writing implement D of the third embodiment, similarly to the first embodiment, the ink impregnated in the ink occluding body 20 is smoothly supplied to the pen tips 50c, 60c through the ink guide tubes 30, 40, and is supplied to the ballpoint pen. Writing (bold, fine) is possible. In addition, in the writing implement D, the ink end sign of the ink storage body 20 can be detected by visually recognizing the ink guide tubes 30 and 40 through the visual recognition portions 12 and 13 formed on the barrel 10.
[0023]
FIG. 8 shows a fifth embodiment of the present invention. In the writing implement E of the fifth embodiment, the inside of the barrel 10 is separated into two chambers by a partition wall 10f, and the isolated barrels 10g and 10h have ink occlusion impregnated with inks of different ink types, respectively. This is different from the writing implement A of the first embodiment in that the bodies 20c and 20d are housed. In FIG. 8, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
In the writing implement E of the fifth embodiment, the respective inks impregnated in the ink occluding bodies 20c and 20d are smoothly supplied to the nibs 50 and 60 through the ink guide tubes 30 and 40, and are used for a felt-tip pen (bold, fine). Can be written. In the present embodiment, since the inside of the barrel 10 is separated into two chambers as compared with the first embodiment, for example, two ink types of red and black are impregnated in the respective ink occluding bodies 20c and 20d. Thereby, two writing applications can be exhibited with one writing instrument.
Further, in the writing implement E, the ink guide tubes 30 and 40 can be visually recognized through the visual recognition portions 12 and 13 formed on both sides of the shaft cylinder 10 with the respective ink end signs impregnated in the respective ink occluding bodies 20c and 20d. Can be detected respectively.
[0024]
FIGS. 9A and 9B show a sixth embodiment of the present invention. The writing implement F of the sixth embodiment is different from the writing implement A of the first embodiment in that the ink impregnated in the ink occluding body 20 is supplied to the ink inlet tube 30 via the relay core 25. In FIG. 9, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
The relay core 25 is a fiber bundle core obtained by processing a fiber bundle such as a fiber bundle or a felt in the same manner as the ink occlusion body 20 of the first embodiment, or a resin sponge made of a hard sponge, a resin particle sintered body, or the like. , A sliver core or the like having continuous pores (flow paths), as long as the ink impregnated in the ink occluding body 20 can be supplied to the visible ink guide tube 30 through the relay core 25. The shape, structure, and the like are not particularly limited. For example, as shown in FIGS. 9A and 9B, the front end of the relay core 25 is provided inside the rear end 30a of the ink guide tube 30. One having an insertion portion 26 to be inserted, and a rear end having an acute angle portion 27 having an acute angle shape. In addition, a hollow portion 20e that can come into contact with the outer layer portion of the relay core 25 is provided on the tip end side of the ink storage body 20. Due to the structure of the relay core 25 having the insertion portion 26 and the acute angle portion 27 and the ink occluding body 20 having the hollow portion 20a as shown in FIGS. The ink can be more efficiently supplied to the ink guide tube 30 having visibility via the relay core 25.
Further, the capillary force of the relay core 25 is set to be larger than the capillary force of the ink occluding body 20, and the cross-sectional structure of the relay core 25 is configured to have an inner layer portion and an outer layer portion. The ink impregnated in the ink occluding body 20 is transferred to the ink guide tube 30 by making the fiber bundle density of the outer layer portion finer and the inner layer portion of the fiber bundle density coarser than that of the capillary force, for example. It can be supplied efficiently.
[0025]
Here, the total length of the relay core 25 is 5% or more, preferably 10% or more and 100% or less of the total length of the ink occluding body 20, and is in contact with the inside of the ink occluding body 20, that is, the relay core 25 L contacting the inside of the ink storage body 20 ₁ Is preferably 5% or more, more preferably 10% or more of the total length of the ink occluding body 20, more preferably 20% to 100%, and particularly preferably 50% to 100%. It is desirable to be in contact with the inside of the ink occluding body 20. Thereby, the ink contained in the ink storage body 20 can be further efficiently supplied to the ink guide tube 30. Length L of relay core 25 shown in FIGS. 9A and 9B ₁ Is set to 20% of the total length of the ink occluding body 20. If the length of contact with the inside of the ink occluding body 20 is less than 5%, the ink consumption rate may be the same level as that of a normal batting-type writing instrument.
Further, the sectional area W of the relay core 25 ₁ Is preferably 1% to 90%, preferably 2% to 25%, more preferably 4% to 10% of the sectional area W of the ink occluding body 20.
The cross-sectional area W of this relay core 25 ₁ Is less than 1%, it depends on the form of the pen tip 40, but there is a problem that the amount of ink supplied from the ink occluding body 20 is insufficient, the drawing line is blurred, and the ability to follow fast writing is poor. If it exceeds, not only is it difficult to insert into the ink occluding body 20, but also the function as the ink occluding body 20 becomes small, and it is no different from the conventional batting-type writing implement as the relay core 25 at all.
Cross-sectional area W of the relay core 25 ₁ Is set to 1 to 90% of the sectional area W of the ink occluding body 20, the ink contained in the ink occluding body 20 can be further efficiently supplied to the ink guide tube 30. The cross-sectional area W of the relay core 25 shown in FIGS. ₁ Is set to 60% of the sectional area W of the ink occluding body 20.
Furthermore, in the writing instrument F of the sixth embodiment, the relay core is made of any one of a fiber bundle core, a resin particle porous body, and a sliver core, and the relay core has a continuous flow path, so that the ink guide tube is formed. Can be controlled substantially while maintaining the apparent cross-sectional area of the ink flow path. That is, it is possible to increase the flow resistance in the ink guide tube and to suppress the ink running out in the ink guide tube due to an impact such as when the pen is dropped.
Further, the capillary force of the capillary formed by the gap between the ink guide tube 30, the ink occluding body 20, the relay core 25, the pen tip 50, and the joint between the ink guide tube 30 and the relay core 25 increases the ink guide tube and the relay core. By satisfying the relationship of the gap at the junction with the pen> the pen tip 50> the relay core 25> the ink storage body 20> the ink guide tube 30, the ink can be distributed more smoothly.
[0026]
Further, in the writing instrument F of the sixth embodiment, the ink supplied from the relay core 25 to the ink guide tube 30 having visibility is further applied to the pen point relay core 28 inserted into the front end portion 30b of the ink guide tube 30. It may be configured to be supplied to the pen point 50 through the pen.
In the writing implement F of the sixth embodiment configured as described above, the ink impregnated in the ink occluding body 20 passes through the ink guide tube 30 via the relay core 25 and passes through the pen tip 50 or the pen tip relay core 28. Thus, it is smoothly supplied to the pen point 50 and writing becomes possible. In addition, in the writing implement F, the ink end sign of the ink storage body 20 can be detected by visually recognizing the ink guide tube 30 through the visual recognition part 12 formed in the barrel 10.
Preferably, the capillary force of the capillary formed by the gap between the ink guide tube 30, the ink occluding body 20, the pen tip relay core 28, the relay core 25, the pen tip 50, and the joint between the ink guide tube 30 and the relay core 25 is as follows. It is desirable to set the relationship between the gap between the junction between the ink guide tube 30 and the relay core 25> the pen tip 50> the pen tip relay core 28> the ink storage body 20> the ink guide tube 30. By satisfying this relationship, it is possible to achieve good writing even in writing with the pen tip upward.
Furthermore, in this embodiment, only one side of the pen tip 50 is shown, but the pen tip 60 on the opposite side has the same structure as the relay core 25 and / or the pen tip relay core 28 having the same structure as described above. Alternatively, the ink may be supplied to the ink guide tube 40 via the ink.
[0027]
FIGS. 10A and 10B show a seventh embodiment of the present invention. The writing implement G according to the seventh embodiment has a plurality of ink guide tubes 31 and 32 having visibility, and in the present embodiment, a visible ink guide tube composed of transparent members or translucent members having different lengths. This is different from the writing instrument A of the first embodiment in that two pieces 31 and 32 are provided. In FIGS. 10A and 10B, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the writing instrument G according to the seventh embodiment, the ink guide tubes 31 and 32 having the long overall length have the rear end portions 31a and 32a penetrating through the rear holder 21 as shown in FIG. And the front end portions 31b and 32b penetrate the front holder 23 that seals the inside of the small diameter portion 10a of the barrel 10, and the pen tip 50 The rear ends are fitted with their ends aligned. Thus, the ink guide tubes 31 and 32 are held at the center of the viewing space 14.
[0028]
In the writing implement G according to the seventh embodiment, similarly to the first embodiment, the ink impregnated in the ink occluding body 20 is supplied to the pen tip 50 through the ink guide tubes 31 and 32 to enable writing. Become. In addition, in this writing implement G, since each end 31a, 32a of the ink guide tube is stabbed into the ink occluding body 20 with a difference in X length, the ink impregnation rate of the ink occluding body 20 gradually increases from the maximum. When the ink is consumed by writing, the ink in the long ink guide tube 31 is cut off without flowing and the ink occluding body 20 is detected, for example, about 80%, to be detected through the visual recognition unit 12. When the ink is consumed by further writing and the ink in the short ink guide tube 32 is cut off without flowing, that is, the ink occluding body 20 can detect through the visual recognition section 12 that the ink has ended. It becomes.
Therefore, in the writing implement G of the seventh embodiment, by arranging the ends 31a and 32a of the ink guide tube with a difference in the length of X, the remaining amount of ink of the ink storage body 20 and the end sign can be determined. The ink guide tubes 31 and 32 can be detected by visually recognizing the ink guide tubes 31 and 32 via the visual recognition unit 12 formed in the above.
[0029]
In the seventh embodiment, ink guide tubes 31 and 32 having different lengths are used. However, ink guide tubes having the same length may be used. In this case, ink supply is good. And the sign of ink end can be detected.
In the seventh embodiment, the number of the ink guide tubes is two. However, depending on the application of the writing implement, three or more ink guide tubes having different lengths or the same length may be appropriately provided. It is.
Further, the relay core 25 and the pen point relay core 28 of the sixth embodiment may be employed. Further, in this embodiment, only one side of the pen tip 50 is shown, but ink is supplied to the ink guide tube 40 on the other side of the pen tip 60 using the same configuration as described above. It may be.
[0030]
FIGS. 11A to 11C show an eighth embodiment of the present invention. In the writing implement H of the eighth embodiment, a fiber made of a resin different in color from the ink, for example, polypropylene, has a smaller surface tension than the ink impregnated in the ink occluding body 20 in the ink guide tube 35 having visibility. A bundle 36 (FIG. 11 (b)) or a porous body 37 (FIG. 11 (c)) made of resin particles, for example, polypropylene resin particles, is inserted in parallel with the ink guide tube 35, and This is different from the writing implement A of the first embodiment only in that the cross-sectional area of the ink flow path flowing through the ink guide tube 35 is substantially controlled while maintaining the apparent cross-sectional area. Note that the length of the rod-shaped body 36 and the length of the porous body 37 are shorter than the length of the ink guide tube 30 because the insertion portion of the relay core 25 is inserted into the rear end portion of the ink guide tube 35. In FIGS. 11A and 11B, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
The hue of the rod-shaped body 36 or the porous body 37 of the fourth embodiment is preferably different from the color of the ink impregnated in the ink occluding body 20, and is preferably a color concealed by the ink color used. , White.
[0031]
In the writing implement H of the eighth embodiment, the ink impregnated in the ink occluding body 20 passes through the ink guide tube 35 having visibility in which the rod-shaped body 36 or the porous body 37 is inserted without contacting the inner wall of the ink guide tube 35. As described above, it is supplied to the pen point 50 and writing is enabled. In the writing implement H, the surface tension is smaller than that of the ink, and the rod-shaped body 36 or the porous body 37 having a different color from the ink is provided inside the ink guide tube 35 without being in contact with the inner wall of the ink guide tube 35. Since the cross-sectional area of the ink flow channel flowing through the ink guide tube 35 can be reduced and the cross-sectional area can be substantially reduced without changing the apparent cross-sectional area of the ink guide tube, the volume of ink flowing through the ink guide tube 35 can also be reduced. Therefore, the function of detecting the end of ink and the problem of excessive ink spill at the end of ink can be solved at the same time.
In the writing implement H of the eighth embodiment, the end of ink in the writing implement of the first to seventh embodiments is different from that detected by visually recognizing that the ink guide tube has run out of ink. When the ink is cut off, the ink guide tube 35 can visually recognize the hue of the rod-shaped body 36 or the porous body 37 different from the ink color, so that the end sign of the ink can be more clearly recognized visually. . Further, the relay core 25 and the pen point relay core 28 of the sixth embodiment may be employed. Further, in this embodiment, only one side of the pen tip 50 is shown, but ink is supplied to the ink guide tube 40 on the other side of the pen tip 60 using the same configuration as described above. It may be.
[0032]
FIG. 12 shows a ninth embodiment of the present invention. In the writing instrument I of the ninth embodiment, the inside of the barrel 10 is separated into two chambers by a partition wall 10i, and the isolated barrels 10j and 10k have ink occlusion impregnated with inks of different ink types, respectively. This is different from the writing implement A of the first embodiment in that the bodies 20f and 20g are housed. In FIG. 12, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the writing implement I of the ninth embodiment, each ink impregnated in the ink occluding bodies 20f and 20g is smoothly supplied to the pen nibs 50b and 60b through the ink guide tubes 30 and 40 to be written for a ballpoint pen and a writing pen. Becomes possible. In the present embodiment, since the inside of the barrel 10 is separated into two chambers as compared with the first embodiment, for example, two ink types for a red felt-tip pen and a black ball-point pen are used for each ink occluding body. By impregnating 20f and 20g, two writing applications can be exhibited with one writing instrument.
In addition, in the writing implement I, the ink guide tubes 30, 40 can be visually recognized through the visual recognition portions 12, 13 formed on both sides of the shaft cylinder 10 with the respective ink end signs impregnated in the respective ink occlusion bodies 20f, 20g. Can be detected respectively. The signature is detected by visually recognizing the ink guide tube 30 via the visual recognition unit 12. Although the ink types to be impregnated into the ink occluding bodies 20f and 20g are different, the same ink type may be appropriately used.
[0033]
The writing implement of the present invention is not limited to the above embodiments, and it goes without saying that the present invention can be changed to various forms without changing the gist of the present invention.
For example, suitably combining the first embodiment (including the modified example of FIG. 4) to the ninth embodiment, for example, the sixth to eighth writing instruments may be added to the writing implements of the first to fifth embodiments. Each writing implement of the embodiment may be applied.
In addition, the writing implement of the present invention includes pen tips 50 and 60 serving as writing parts on both sides of the barrel 10, and the ink impregnated in the ink occluding body 20 in the barrel 10 is applied to the respective pen tips 50 and 60. A twin-type writing implement for supplying ink, wherein the ink impregnated in the ink occluding body 20 is supplied to each pen tip 50, 60 via an ink guide tube 30, 40 having visibility, respectively. The gist is a structure that can detect the ink end sign from 20 by visually recognizing the respective ink guide tubes 30 and 40 through the visual recognition portions 12 and 13 formed on the barrel 10, respectively. There is no particular limitation on the configuration that can be used.A variety of known writing instrument structures can be adopted, and the nib and ink type can be changed depending on the application such as a ball-point pen, felt-tip pen, marking pen, and brush pen. Those which can be applied to writing instruments suitably various applications by changing.
Furthermore, the present invention may be applied to an applicator that uses a writing implement ink as a correction liquid, a coating liquid, or a liquid cosmetic such as a cosmetic.
[0034]
【Example】
Next, the present invention will be described in more detail based on specific examples, but the present invention is not limited to the following examples.
The surface tension of the ink and the like was measured by the Wilhelmy method (CBVP-Z type, manufactured by Kyowa Interface Science), and the viscosity coefficient of the ink was measured by a rotational viscometer (TV-20L, manufactured by Tokimec).
[0035]
The ink impregnated in the ink occluding material had the following composition.
(1) Ink composition for fluorescent underline (mixing unit: wt%, total amount 100 wt%)
Glycerin 25.0% by weight
Preservative (Proxel GXL, manufactured by ICI) 0.7% by weight
Fluorescent pink toner (NKW-3907, manufactured by Nippon Fluorescent) 30.0% by weight
Purified water balance
In place of the fluorescent pink toner (NKW-3907, manufactured by Nippon Fluorescent), the same amount of fluorescent yellow toner (NKW-5005, manufactured by Nippon Fluorescent) or a fluorescent blue toner (NKW-2108, manufactured by Nippon Fluorescent) Alternatively, a fluorescent underline ink of each color (pink, yellow, blue, green) was prepared using a fluorescent green toner (NKW-5002, manufactured by Nippon Fluorescent).
The surface tension of the fluorescent underlining ink of each color was 35 mN / m, and the ink viscosity coefficient was 3 mPa · s.
[0036]
{Circle around (2)} Ink composition for oil-based felt-tip pens (combination unit: wt%, total amount 100 wt%)
3.5% by weight of benzyl alcohol
Alkyl phenol resin 10.0% by weight
SBN Blue 701 (manufactured by Hodogaya Chemical Company) 4.0% by weight
Surfactant (Sunsoft Q-182F, manufactured by Taiyo Kagaku) 0.6% by weight
Ethyl lactate 3.0% by weight
Ethanol balance
Ink surface tension: 21 mN / m
Ink viscosity coefficient: 2.2 mPa · s
[0037]
{Circle around (3)} Ink composition for water-based felt-tip pens (combination unit: wt%, total amount 100 wt%)
11.0% by weight of carbon black (Printex 25, manufactured by Degussa)
Acrylic resin 6.0% by weight
2.76% by weight of ethylene glycol
Surfactant (Surflon S-111, manufactured by Asahi Glass Co.) 0.1% by weight
Aminomethylpropanol 0.22% by weight
Preservative (Proxel GXL, manufactured by ICI) 0.7% by weight
Purified water balance
Ink surface tension: 25mN / m
Ink viscosity coefficient: 3 mPa · s
[0038]
{Circle around (4)} Ink composition for water-based ballpoint pen (mixing unit: wt%, total amount 100 wt%)
C. I. Direct Black-154 4.5% by weight
C. I. Direct Black-154 1.5% by weight
Ethylene glycol 10.0% by weight
Glycerin 10.0% by weight
Gelling agent (xanthan gum) 0.18% by weight
Preservative (Proxel GXL, ICI) 0.5% by weight
Styrene acrylic acid resin (ammonia neutralized) 3.0% by weight
0.2% by weight of surfactant (ECTD3NEX, manufactured by Nikko Chemicals)
Purified water balance
Ink surface tension: 40 mN / m
Ink viscosity coefficient: 5 mPa · s
[0039]
(5) Ink composition for water-based ballpoint pen (combination unit: wt%, total amount 100 wt%)
C. I. Acid Blue-15 3.0% by weight
C. I. Acid Red-87 1.0% by weight
Ethylene glycol 10.0% by weight
Glycerin 10.0% by weight
Gelling agent (xanthan gum) 0.18% by weight
Preservative (Proxel GXL, ICI) 0.5% by weight
Styrene acrylic acid resin (ammonia neutralized) 3.0% by weight
0.2% by weight of surfactant (ECTD3NEX, manufactured by Nikko Chemicals)
Purified water balance
Ink surface tension: 41 mN / m
Ink viscosity coefficient: 5 mPa · s
[0040]
[Example 1, for underline]
A twin-type underline pen J according to FIG. 13 was manufactured using a shaft cylinder, an ink storage body, an ink guide tube, a relay core, a pen point, and an ink composition having the following configuration.
(1) Shaft barrel 10
Made of PP, total length 100mm, length 10mm for each visible part 12
{Circle around (2)} Ink occluding bodies 20, 20
Both are composed of PET batting (porosity 80%), diameter 7mm, length 40mm
(3) Ink guide tube 30, 30
Both made of PP, inner diameter 2mm, outer diameter 3mm, length 20mm, ink flow path cross-sectional area 0.03mm ² The surface tension (25 ° C.) of the material of the ink guide tube itself (the inner surface, the same applies hereinafter) is 31 mN / m, and the length at which the rear end portion fits into the ink absorbing body 20 is 5 mm.
(4) Relay cores 25, 25
Both are composed of PET slivers (porosity 70%), 2 mm in diameter, 30 mm in length, 5 mm in length to fit in the ink guide tube 30
(5) Pen tip 50a
Both are composed of PET sliver core (porosity 60%), length 15mm
(6) Ink composition
1.0 g of the fluorescent pink ink and 1.0 g of the fluorescent yellow ink of the above (1) were filled in the respective ink occluding bodies 20.
[0041]
In the felt-tip pen obtained by the above configuration, after assembly, each pink ink and yellow ink can be visually recognized through the ink guide tubes 30 and 30 through the viewing portions 12 and 12, and then the pen tips 50a and As a pen for underlining, the amount of ink flowing out was almost constant until the end of the ink as in the case of the direct liquid writing tool, and it was found that a good drawing line could be drawn.
Writing was continued until the ink impregnated in each of the ink occluding bodies 20, 20 was finished. As a result, the ink guide tubes 30, 30 were depleted of pink ink and yellow ink, that is, a sign indicating the end of ink from the ink occluding body 20. Can be easily and reliably detected by visually recognizing the ink guide tubes 30 and 30 via the visual recognition portions 12 and 12 formed in the shaft cylinder 10.
Furthermore, after the end was detected by the ink guide tubes 30, 30, the outflow amount of each ink was rapidly attenuated, and writing became impossible.
[0042]
[Example 2, underline pen, aqueous ballpoint pen]
An underline based on FIG. 14 and a twin pen K for an aqueous ballpoint pen using the shaft cylinder, the ink storage body, the ink guide tube, the relay core, the pen tip, and the ink composition having the following constitution were produced.
(1) Shaft barrel 10
Made of PP, total length 100mm, length 10mm for each visible part 12
{Circle around (2)} Ink occluding bodies 20, 20
Both are composed of PET batting (porosity 80%), diameter 7mm, length 40mm
(3) Ink guide tube 30, 30
Both made of PP, inner diameter 2mm, outer diameter 3mm, length 20mm, ink flow path cross-sectional area 0.03mm ² The surface tension (25 ° C.) of the material of the ink guide tube itself (the inner surface, the same applies hereinafter) is 31 mN / m, and the length at which the rear end portion fits into the ink absorbing body 20 is 5 mm.
(4) Relay cores 26a, 26b
Both are composed of PET slivers (porosity 70%), 2 mm in diameter, 30 mm in length, 5 mm in length to fit in the ink guide tube 30
5) Pen nibs 50a, 50b
The pen tip 50a is composed of a PET sliver core (porosity: 60%), and has a length of 15 mm.
The pen tip 50b is composed of an acrylic fiber sliver core (porosity 60%), length 15 mm, ball diameter 0.7 mm
(6) Ink composition
The ink absorbing member 20a was filled with 1.0 g of the black aqueous ballpoint pen ink (4), and the ink absorbing member 20b was filled with 1.0 g of the fluorescent blue ink of (1).
[0043]
After assembling, the pen obtained by the above configuration can visually recognize that each of the black ink and the blue ink passes through the ink guide tubes 30, 30 through the visual recognition portions 12, 12, and then the pen tips 50a, It was found that the ink penetrated into 50b penetrated underwater and a water-based ball-point pen had a substantially constant outflow amount of ink until the ink ended, like a direct liquid type writing instrument, and that a good drawing line could be drawn.
Writing was continued until each ink impregnated in each of the ink occluding bodies 20a and 20b was completed. As a result, the black and blue inks were no longer present in the ink guide tubes 30 and 30, that is, the ink ending from the ink occluding body 20 was completed. By visually recognizing the ink guide tubes 30 and 30 via the visual recognition portions 12 and 12 formed on the shaft cylinder 10, a simple and reliable detection was possible.
Furthermore, after the end was detected by the ink guide tubes 30, 30, the outflow amount of each ink was rapidly attenuated, and writing became impossible.
[0044]
[Example 3, oil-based felt-tip pen, water-based felt-tip pen]
A twin pen L serving as an oil-based felt-tip pen and a water-based felt-tip pen based on FIG. 15 was manufactured using a shaft cylinder, an ink storage body, an ink guide tube, a relay core, a pen tip, and an ink composition having the following configurations.
(1) Shaft barrel 10
Made of PP, 100 mm in total length, 10 mm in length of each visual recognition part 13
{Circle around (2)} The ink occluding bodies 20a and 20b
The ink occluding body 20a is made of an acrylic batting (porosity: 80%), a diameter of 7 mm, and a length of 40 mm.
The ink occluding body 20b is made of PET batting (porosity: 80%), diameter 7 mm, length 40 mm
(3) Ink guide tubes 40a, 40b
Both made of PP, inner diameter 2mm, outer diameter 3mm, length 20mm, ink flow path cross-sectional area 0.03mm ² The inner surface of the ink guide tube was treated with a fluororesin. The surface tension of the inner surface (25 ° C.) is less than 20 mN / m, and the rear end portion is 5 mm long to be fitted into the ink occluding body 20 {circle around (4)} Relay cores 27 a, 27 b
Both are composed of PET slivers (porosity 70%), 2 mm in diameter, 30 mm in length, 5 mm in length to fit in the ink guide tube 30
(5) Pen tip 60a, 60b
Both are composed of PET sliver core (porosity 60%), length 15mm
(6) Ink composition
The ink occluding body 20a was filled with 1.0 g of the above-mentioned (2) blue oil-based sign pen ink, and the ink occluding body 20b was filled with 1.0 g of the above-mentioned (3) black aqueous sign pen ink.
[0045]
After assembling, the pen obtained by the above configuration can be visually confirmed through the visual recognition portions 13 and 13 that the black ink and the blue ink pass through the ink guide tubes 40a and 40b. It has been found that the ink penetrating into 60b penetrates into the oil-based and water-based writing pens, and the ink bleeding amount is almost constant until the ink ends, as in the case of a direct liquid writing implement, and that a good drawing line can be drawn.
Writing was continued until each ink impregnated in each of the ink occluding bodies 20a and 20b was completed. As a result, the black and blue inks disappeared from the ink guide tubes 40a and 40b, that is, the ink from the ink occluding bodies 20a and 20b. By visually recognizing the ink guide tubes 40a and 40b through the visual recognition portions 13 and 13 formed on the shaft cylinder 10, the ink end sign could be easily and reliably detected.
Further, after the end was detected by the ink guide tubes 40a and 40b, the outflow amount of each ink abruptly attenuated and writing became impossible.
[0046]
[Example 4, water-based felt-tip pen (extremely fine), water-based felt-tip pen (fine print)]
A water-based felt-tip pen and a twin-point pen L as a water-based felt-tip pen based on FIG. 15 were manufactured using a shaft cylinder, an ink storage body, an ink guide tube, a relay core, a pen tip, and an ink composition having the following configurations.
(1) Shaft barrel 10
Made of PP, 100 mm in total length, 10 mm in length of each visual recognition part 13
{Circle around (2)} The ink occluding bodies 20a and 20b
Both are composed of PET batting (porosity 80%), diameter 7mm, length 40mm
(3) Ink guide tubes 40a, 40b
Both made of PP, inner diameter 2mm, outer diameter 3mm, length 20mm, ink flow path cross-sectional area 0.03mm ² The inside of the ink guide tube was silicone-treated. The surface tension of the inner surface (25 ° C.) is about 20 mN / m, and the length at which the rear end portion fits into the ink occluding body 20 is 5 mm.
(4) Relay cores 27a, 27b
Both are composed of PET slivers (porosity 70%), 2 mm in diameter, 30 mm in length, 5 mm in length to fit in the ink guide tube 30
(5) Pen tip 60a, 60b
Both consist of PET sliver core (porosity 60%), length 15mm, except for extra fine nib and fine nib
(6) Ink composition
Each of the ink occluding bodies 20a and 20b was filled with 1.0 g of the black aqueous signature pen ink of the above (3).
[0047]
After assembling, the pen obtained by the above configuration can visually recognize that each black ink passes through the ink guide tubes 40a and 40b through the visual recognition portions 13 and 13, and then the pen tips 60a and 60b. It was found that the ink penetrated as a water-based felt-tip pen and the amount of ink flowing out was almost constant until the end of the ink like a direct liquid type writing instrument, and that a good drawing line could be drawn.
Writing was continued until the ink impregnated in each of the ink occluding bodies 20a, 20b was completed. As a result, it was confirmed that each of the black inks had disappeared from the ink guide tubes 40a, 40b. By visually recognizing the ink guide tubes 40a and 40b through the visual recognition portions 13 and 13 formed on the shaft cylinder 10, the sign could be easily and reliably detected.
Further, after the end was detected by the ink guide tubes 40a and 40b, the outflow amount of each ink abruptly attenuated and writing became impossible.
[0048]
[Example 5, oil-based felt-tip pen (bold), oil-based felt-tip pen (medium-sized character)]
A water-based felt-tip pen and a twin-point pen L as a water-based felt-tip pen based on FIG. 15 were manufactured using a shaft cylinder, an ink storage body, an ink guide tube, a relay core, a pen tip, and an ink composition having the following configurations.
(1) Shaft barrel 10
Made of PP, 100 mm in total length, 10 mm in length of each visual recognition part 13
{Circle around (2)} The ink occluding bodies 20a and 20b
The ink occluding body 20a is made of an acrylic batting (porosity: 80%), a diameter of 7 mm, and a length of 40 mm.
The ink occluding body 20b is made of PET batting (porosity: 80%), diameter 7 mm, length 40 mm
(3) Ink guide tubes 40a, 40b
Both made of PP, inner diameter 2mm, outer diameter 3mm, length 20mm, ink flow path cross-sectional area 0.03mm ² The inner surface of the ink guide tube was treated with a fluororesin. The surface tension of the inner surface (25 ° C.) is less than 20 mN / m, and the length at which the rear end portion fits into the ink occluding body 20 is 5 mm.
(4) Relay cores 27a, 27b
Both are composed of PET slivers (porosity 70%), 2 mm in diameter, 30 mm in length, 5 mm in length to fit in the ink guide tube 30
(5) Pen tip 60a, 60b
Except for the bold pen tip and medium pen tip, both consist of PET sliver core (porosity 60%), length 15mm
(6) Ink composition
Each of the ink occluding bodies 20a and 20b was filled with 1.0 g of the blue oil-based felt-tip pen ink described in (2) above.
[0049]
After assembling, the pen obtained by the above configuration can visually recognize that each blue ink passes through the ink guide pipes 40a and 40b through the viewing portions 13 and 13, and then the pen tips 60a and 60b. It was found that the ink penetrated as an oil-based felt pen penetrated, and the ink bleeding amount was almost constant until the end of the ink, as in a direct liquid writing instrument, and that a good drawing line could be drawn.
Writing was continued until the ink impregnated in each of the ink occluding bodies 20a and 20b was completed. As a result, it was found that each of the ink guide tubes 40a and 40b was depleted of the blue ink. By visually recognizing the ink guide tubes 40a and 40b through the visual recognition portions 13 and 13 formed on the shaft cylinder 10, the sign could be easily and reliably detected.
Further, after the end was detected by the ink guide tubes 40a and 40b, the outflow amount of each ink abruptly attenuated and writing became impossible.
[0050]
[Example 6, aqueous ballpoint pen (bold), aqueous ballpoint pen (fine)]
A twin pen M, which is a water-based ballpoint pen (bold and fine characters) based on FIG. 16 using a shaft cylinder, an ink absorbing member, an ink guide tube, a relay core, a pen point, and an ink composition having the following configuration, was produced.
(1) Shaft barrel 10
Made of PP, 100 mm in total length, 10 mm in length of each visual recognition part 12, 13
{Circle around (2)} The ink occluding bodies 20a and 20b
Both are composed of PET batting (porosity 80%), diameter 7mm, length 40mm
(3) Ink guide tubes 30a, 40a
Both made of PP, inner diameter 2mm, outer diameter 3mm, length 20mm, ink flow path cross-sectional area 0.03mm ² The inside of the ink guide tube was silicone-treated. The surface tension of the inner surface (25 ° C.) is about 20 mN / m, and the length at which the rear end portion fits into the ink occluding body 20 is 5 mm.
(4) Relay cores 28a, 28
Both are composed of PET slivers (porosity 70%), 2 mm in diameter, 30 mm in length, 5 mm in length to fit in the ink guide tube 30
(5) Pen tip 50b, 60c
The pen tip 50b is composed of an acrylic fiber sliver core (porosity 60%), length 15 mm, ball diameter 0.3 mm
The pen tip 60c is composed of an acrylic fiber sliver core (porosity 60%), length 15 mm, ball diameter 0.7 mm
(6) Ink composition
Each of the ink occluding bodies 20a and 20b was filled with 1.0 g of the above black aqueous ballpoint pen ink (4).
[0051]
After assembling, the pen obtained by the above configuration can visually recognize that each black ink passes through the ink guide pipes 30a and 40a via the visual recognition portions 12 and 13, and then the pen tips 50b and 60c. It was found that the ink penetrates as a water-based ballpoint pen, and the amount of ink flowing out is almost constant until the end of the ink, like a direct liquid type writing instrument, and that a good drawing line can be drawn.
Writing was continued until the ink impregnated in each of the ink occluding bodies 20a, 20b was completed. As a result, it was confirmed that each of the black inks had disappeared from the ink guide tubes 30a, 40a. By visually recognizing the ink guide tubes 30a and 40a via the visual recognition portions 12 and 13 formed on the shaft cylinder 10, the sign could be easily and reliably detected.
Furthermore, after the end was detected by the ink guide tubes 30a and 40a, the outflow amount of each ink was abruptly attenuated and writing became impossible.
[0052]
[Example 7, black aqueous ballpoint pen, red aqueous ballpoint pen]
A twin pen M as a black and red water-based ball-point pen based on FIG. 16 was manufactured using a barrel having the following structure, an ink absorbing member, an ink guide tube, a relay core, a pen tip, and an ink composition.
(1) Shaft barrel 10
Made of PP, 100 mm in total length, 10 mm in length of each visual recognition part 12, 13
{Circle around (2)} The ink occluding bodies 20a and 20b
Both are composed of PET batting (porosity 80%), diameter 7mm, length 40mm
(3) Ink guide tubes 30a, 40a
Both made of PP, inner diameter 2mm, outer diameter 3mm, length 20mm, ink flow path cross-sectional area 0.03mm ² The surface tension (25 ° C.) of the material of the ink guide tube itself (the inner surface, the same applies hereinafter) is 31 mN / m, and the length at which the rear end portion fits into the ink absorbing body 20 is 5 mm.
(4) Relay cores 28a, 28
Both are composed of PET slivers (porosity 70%), 2 mm in diameter, 30 mm in length, 5 mm in length to fit in the ink guide tube 30
(5) Pen tip 50b, 60c
Both are composed of acrylic fiber sliver core (porosity 60%), length 15mm, ball diameter 0.5mm
(6) Ink composition
The ink occluding body 20a was filled with 1.0 g of the black aqueous ballpoint pen ink (4), and the ink occluding body 20b was filled with 1.0 g of the red aqueous ballpoint pen ink (5).
[0053]
After assembling, the pen obtained by the above configuration can visually recognize that the black and red inks pass through the ink guide tubes 30a and 40a via the visual recognition portions 12 and 13, and then the pen tips 50b and 60c. It was found that the amount of ink flowing out as a water-based ball-point pen was almost constant until the ink ended, as in a direct liquid type writing instrument, and that a good drawing line could be drawn.
Writing was continued until the ink impregnated in each of the ink occluding bodies 20a and 20b was completed. As a result, the black and red inks in the ink guide tubes 30a and 40a disappeared. By visually recognizing the ink guide tubes 30a and 40a through the visual recognition portions 12 and 13 formed on the shaft cylinder 10, the ink end sign could be easily and reliably detected.
Furthermore, after the end was detected by the ink guide tubes 30a and 40a, the outflow amount of each ink was abruptly attenuated and writing became impossible.
[0054]
[Example 8, for underline, for felt-tip pen]
A twin-type underline and felt-tip pen B according to FIG. 5 using a barrel, an ink occlusion body, an ink guide tube, a pen tip, and an ink composition having the following configuration were produced.
(1) Shaft barrel 10
Made of PP, 100 mm in total length, 10 mm in length of each visual recognition part 12, 13
(2) Ink storage body 20
Constructed from PET batting (porosity 80%), diameter 7mm, length 90mm
(3) Ink guide tubes 30, 40
Both made of PP, inner diameter 2mm, outer diameter 3mm, length 20mm, ink flow path cross-sectional area 0.03mm ² The surface tension (25 ° C.) of the material of the ink guide tube itself (the inner surface, the same applies hereinafter) is 31 mN / m, and the length at which the rear end portion fits into the ink absorbing body 20 is 5 mm.
(4) Pen tip 50a, 60a
Except for underline and felt-tip pens, both consist of PET sliver core (porosity 60%), length 15mm
(5) Ink composition
2.0 g of the fluorescent green ink of the above item (1) was filled in the ink absorbing member 20.
[0055]
After assembling, the pen obtained by the above configuration can visually recognize that each green ink passes through the ink guide tubes 30 and 40 through the viewing portions 12 and 13 and then penetrates the pen tips 50a and 60a. It was found that the ink bleed amount for underline pens and felt-tip pens was almost constant until ink ending, like a direct liquid writing instrument, and that good drawing lines could be drawn.
When writing was continued until the ink impregnated in the ink occluding body 20 was completed, it was found that the green ink had disappeared from the ink guide tubes 30 and 40, that is, the ink end sign from the ink occluding body 20 was formed on the barrel 10. By visually recognizing the ink guide tubes 30 and 40 through the visual recognition portions 12 and 13, it was possible to easily and reliably detect the ink guide tubes 30 and 40.
Furthermore, after the end was detected by the ink guide tubes 30 and 40, the outflow amount of each ink was rapidly attenuated and writing became impossible.
[0056]
【The invention's effect】
According to the present invention, a twin-type writing implement that includes a pen tip serving as a writing portion on both sides of the barrel and supplies ink impregnated in the ink occluding body in the barrel to each pen tip, With a simple configuration, it is possible to easily and reliably detect the end sign of ink visually, and the amount of ink flowing out is almost constant until ink end like a direct liquid type writing instrument, and draws good drawing lines Is provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a writing instrument according to a first embodiment of the present invention.
FIGS. 2A to 2J are cross-sectional views showing various forms of an ink guide tube 30. FIGS.
FIG. 3 is a partial longitudinal sectional view of a writing instrument according to the first embodiment of the present invention.
4A is a partial longitudinal sectional view showing a modified example of the ink occluding body 20, FIG. 4B is a partial longitudinal sectional view showing a modified example of the barrel 10 and the ink occluding body 20, and FIG. () Is a partial longitudinal sectional view showing a modified example of the barrel 10.
FIG. 5 is a longitudinal sectional view of a writing instrument according to a second embodiment of the present invention.
FIG. 6 is a longitudinal sectional view of a writing instrument according to a third embodiment of the present invention.
FIG. 7 is a longitudinal sectional view of a writing instrument according to a fourth embodiment of the present invention.
FIG. 8 is a longitudinal sectional view of a writing instrument according to a fifth embodiment of the present invention.
FIG. 9 is a partial longitudinal sectional view of a writing instrument showing a sixth embodiment of the present invention, and FIG. 9 (b) is a partial longitudinal sectional view showing a main part thereof, that is, a joining state of an ink guide tube, a relay core, and an ink impregnated body. FIG.
10A is a partial longitudinal sectional view of a writing instrument showing a seventh embodiment of the present invention, and FIG. 10B is a partial longitudinal sectional view showing a main part thereof.
FIG. 11A is a partial longitudinal sectional view of a writing instrument according to an eighth embodiment of the present invention, and FIGS. 11B and 11C are partial longitudinal sectional views illustrating main parts thereof.
FIG. 12 is a longitudinal sectional view of a writing instrument according to a ninth embodiment of the present invention.
FIG. 13 is a longitudinal sectional view of a writing instrument applied to the first embodiment of the present invention.
FIG. 14 is a longitudinal sectional view of a writing instrument applied to the second embodiment of the present invention.
FIG. 15 is a longitudinal sectional view of a writing instrument applied to the third to fifth embodiments of the present invention.
FIG. 16 is a longitudinal sectional view of a writing instrument applied to the sixth and seventh embodiments of the present invention.
[Explanation of symbols]
A writing instrument
10 shaft barrel
12, 13 Viewing part
20 Ink occlusion body
30, 40 Visible ink guide tube
50, 60 pen point

Claims (19)

A twin-type writing implement that includes a pen tip that serves as a writing part on both sides of the barrel and supplies ink impregnated in the ink storage body in the barrel to each pen tip, and is impregnated in the ink storage body. The supplied ink is supplied to each pen tip via an ink guide tube having visibility, and the ink guide tubes are provided via respective viewing portions formed on the shaft cylinders, respectively, with the ink end sign from the ink occluding body. A writing instrument characterized by detecting by visually recognizing the object. The writing implement according to claim 1, wherein there is one ink storage body in the barrel. The writing implement according to claim 1, wherein the inside of the barrel is isolated, and each of the isolated barrels contains an ink occluding body. Each nib provided on both sides of the barrel is one selected from a felt pen core, a sliver core, a ballpoint pen, a fiber bundle core, a sintered core, a fountain pen, and a brush, and each nib is from the same mechanism or a different mechanism. The writing implement according to any one of claims 1 to 3, characterized in that: The writing implement according to any one of claims 1 to 4, wherein the ink impregnated in the ink occluding body is supplied to the ink guide tube via a relay core. 6. The writing instrument according to claim 5, wherein a joint between the ink guide tube and the relay core is closed to outside air. The writing implement according to claim 5, wherein the ink supplied to the ink guide tube having visibility by the relay core is further supplied to the pen tip via the pen tip relay core. The capillary force of the capillary formed by the ink guide tube, the ink occluding body, the relay core, the pen tip, and the junction between the ink guide tube and the relay core increases the junction between the ink guide tube and the relay core> pen tip> relay core 6. The writing implement according to claim 5, wherein the relationship is that:> ink storage body> ink guide tube. The writing implement according to any one of claims 1 to 8, wherein the surface tension of the surface of the ink guide tube having visibility that is in contact with the ink or the material itself of the ink guide tube is smaller than the surface tension of the ink. The writing instrument according to any one of claims 1 to 9, wherein the distribution of the capillary force of the ink occluding body becomes larger toward the pen tip side. The writing instrument according to any one of claims 1 to 10, wherein the inner diameter of the barrel becomes narrower toward the pen tip side. The writing instrument according to any one of claims 1 to 11, wherein a rib body is formed in a plurality of axial directions inside the pen tip side of the barrel. The relay core is composed of any one of a fiber bundle core, a resin particle porous body, and a sliver core, and these relay cores have a continuous flow path so that the ink is substantially maintained while maintaining the apparent cross-sectional area of the ink guide tube. The writing implement according to any one of claims 1 to 12, wherein a cross-sectional area of the ink flow path flowing through the guide tube can be controlled. A rod-shaped or tubular body with a lower surface tension than ink and a different color from the ink is placed in parallel with the ink guide tube in the ink guide tube having ink visibility, thereby substantially maintaining the apparent cross-sectional area of the ink guide tube. The writing implement according to any one of claims 1 to 13, wherein the ink flow path cross-sectional area flowing through the ink guide tube can be controlled. The writing implement according to any one of claims 1 to 14, wherein a plurality of ink guide tubes are formed. The writing instrument according to any one of claims 1 to 15, wherein a length of a visible portion of the barrel is 1 mm or more and less than a full length of the writing instrument. The writing instrument as claimed in any one of claims 1 to 16, wherein the ink flow path cross-sectional area of the ink guiding tube is 0.8~80mm ^2. The writing implement according to any one of claims 1 to 17, wherein the surface tension of the ink is 18 mN / m or more at 25 ° C. The writing instrument according to any one of claims 1 to 18, wherein the viscosity coefficient of the ink is 200 mPa · s or less at 25 ° C.

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