JP7316086B2 - Haunting Writing Instrument and Marker Refill - Google Patents

Description

The present invention relates to a retractable writing instrument and a marker refill, and in particular, has a configuration in which a plurality of cores (also referred to as writing cores) are housed in a barrel, and one of these cores can be selectively retracted. The present invention relates to a retractable writing instrument and a marker refill used for the retractable writing instrument.

Patent Literature 1 and Patent Literature 2 disclose retractable writing implements capable of selectively retracting one of a plurality of core cores. In these retractable writing instruments, cores for ball-point pens, cores for mechanical pencils, etc. are mainly used.

JP 2016-068494 A JP 2016-168748 A

When a marker core such as a fluorescent marker or a felt-tip pen is adopted as one of the cores stored in such a retractable writing instrument, when the marker core is retracted, the tip of the marker is placed inside the tip of the barrel of the writing instrument. It is conceivable that it will come into contact with the peripheral surface (see, for example, the operations shown in FIGS. 3 and 4 of Patent Document 1). As a result, the tip of the writing instrument is stained with the ink from the nib of the core of the marker. In addition, if the user puts a writing instrument with a dirty tip in a pocket of clothes, the user may stain the clothes.

The present invention has been made to solve the above-described problems, and is a retractable writing instrument having a marker core as one of the cores, in which the tip of the writing instrument is not soiled when it is retracted, and a retractable writing instrument. An object of the present invention is to provide a marker refill used for such a retractable writing instrument.

A retractable writing instrument according to the present invention includes a barrel having a first opening at its tip, and a core that is housed in the barrel and allows a pen tip to retract and retract from the first opening. The core has an ink reservoir containing the ink composition, a nib attached to the tip of the ink reservoir, and a cover covering the nib and having a second opening at the tip. When the retractable writing instrument is not operated, the pen tip of the core is covered with the cover, and when the retractable writing instrument is operated and the pen tip moves out of the barrel, the cover is closed. The pen tip is configured to move rearward relative to the pen tip so that the tip of the pen tip protrudes from the second opening of the cover.

In the retractable writing instrument described above, a cover is provided to cover the pen tip of the core when not operated, and when the pen tip moves out of the barrel during operation, the cover moves backward relative to the pen tip. so that the tip of the pen tip protrudes from the cover. According to this configuration, the pen tip of the core of the marker is covered with the cover until it comes out of the barrel, so that the pen tip does not come into contact with the inner peripheral surface of the barrel. As a result, according to this retractable writing instrument, the tip of the retractable writing instrument can be kept clean when the pen tip is retracted. In addition, since the tip of the retractable writing instrument is not soiled in this way, even if the user puts this writing instrument in a pocket of his or her clothes, it is possible to prevent his or her clothes from being soiled.

In the retractable writing instrument described above, it is preferable that the core further includes an elastic member disposed between the ink containing portion and the cover, and the elastic member biases the cover forward with respect to the ink containing portion. In this case, the pen tip is covered with a cover when the pen tip is not operated (initial state) when the core of the marker is stored in the barrel, and the pen tip is removed from the cover when the pen tip of the marker protrudes from the barrel. It is possible to realize an operation such as taking out by a simple mechanism.

In the retractable writing instrument, the ink storage section includes a first storage section on the rear end side and a second storage section on the front end side having an outer diameter smaller than that of the first storage section, and the cover has a cylindrical shape. may An elastic member may be arranged along the outer periphery of the second storage portion between the front end of the first storage portion and the rear end of the cover. According to this configuration, the configuration of the core including the elastic member can be made compact, and the size of the retractable writing instrument can be made suitable for writing without making the barrel unnecessarily large. Become.

In the retractable writing instrument, the cover is provided with at least one slit extending along the axial direction of the barrel, and the second storage section is provided with at least one projection on its outer circumference. good. Further, it is preferable that the protrusion is positioned within the slit and moves along the slit, thereby guiding the movement of the cover relative to the ink storage section. With this configuration, the movement of the pen tip from the tip of the cover can be made more reliable, and the tip of the writing instrument can be more reliably prevented from being soiled by the tip of the pen.

In the retractable writing instrument, a gap may be provided between the inner periphery of the cover and the outer periphery of the pen tip, and the width of the gap along the radial direction may be 0.5 mm or more. If the gap between the inner circumference of the cover and the outer circumference of the pen tip is narrow, the ink from the pen tip will flow through the gap due to capillary action and easily flow out of the pen tip, but the gap between the inner circumference of the cover and the pen tip is provided with a certain width, it is possible to prevent such ink leakage from the pen tip. As a result, it is possible to prevent ink from the pen tip from accumulating inside the cover and staining the tip of the barrel with the ink. In addition, since such a gap allows the movement of the cover with respect to the pen tip to have some play, it is also possible to smoothen the movement of the pen tip in and out of the barrel.

In the retractable writing instrument described above, the cover may include a first cover portion on the rear end side and a second cover portion on the tip side having an outer diameter smaller than that of the first cover portion. In this case, it is possible to reduce the outer diameter of the cover on the tip side while maintaining the function of covering the pen tip, so it is possible to move the pen tip to a position closer to the tip of the barrel with the cover covered. . As a result, it is possible to further prevent the inner periphery of the barrel from being stained with ink from the pen tip.

In the retractable writing instrument described above, when the pen tip is protruded from the first opening of the barrel, the tip of the cover moves forward along the inner peripheral surface of the barrel, thereby causing the pen tip to protrude outward. Movement is preferably guided. In this case, it is possible to move the pen tip to a position closer to the tip of the barrel while the pen tip is covered with the cover. As a result, it is possible to further prevent the inner periphery of the barrel from being stained with ink from the pen tip.

In the retractable writing instrument, the ink composition stored in the ink storage portion is preferably an ink composition containing a colorant, a water-soluble organic solvent having a boiling point of 140° C. or higher, and water. Alternatively, the ink composition stored in the ink storage part is preferably an ink composition containing a colorant, a water-soluble organic solvent having a saturated vapor pressure of 20 Pa or less at 25°C, and water. In any of the above ink compositions, the content of the water-soluble organic solvent is 50% by mass or more based on the total amount of the ink composition, and the content of water is 5 to 45% by mass based on the total amount of the ink composition. may be With a retractable writing instrument having a core in which such an ink composition is accommodated, the writing instrument can be Even if the pen tip is exposed to the outside air for a long period of time, the writing line can be used without being blurred. In this retractable writing instrument, the ink composition may have a viscosity of 5.0 to 30.0 mPa·s at 25°C. In this case, the ink composition can be suitably used as a padding type marker.

In the retractable writing instrument, the water-soluble organic solvent contained in the ink composition consists of glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, triethanolamine, and polyethylene glycol having an average molecular weight of 600 or less. It preferably contains at least one selected from the group. By including these water-soluble organic solvents in the ink composition, it becomes easier to obtain a writing instrument capable of forming a scratch-free writing line even after the pen tip is exposed to air for a long period of time. In the ink composition, the colorant may contain at least one selected from the group consisting of acidic dyes, basic dyes, direct dyes, surfactant-dispersed pigments, and self-dispersed pigments. .

Another aspect of the present invention relates to a marker refill used for a retractable writing instrument. This marker refill includes an ink reservoir for accommodating an ink composition, a pen tip attached to the tip of the ink reservoir, a cover that covers the pen tip and has an opening at the tip, and a cover that covers the ink reservoir. and an elastic member that biases forward against. In the marker refill, the pen tip is covered with the cover in the initial state, and when the cover is moved rearward from the initial state against the biasing force of the elastic member, the pen tip is positioned at the opening of the cover. It is configured to protrude outward from the This marker refill can be easily replaced with a new marker core when, for example, the ink in the marker core of any of the retractable writing instruments described above runs out, and is attached to the retractable writing instrument. By doing so, the same effect as described above can be obtained.

In the above marker refill, the ink storage section includes a first storage section on the rear end side and a second storage section on the front end side having an outer diameter smaller than that of the first storage section, and the cover has a cylindrical shape. and the elastic member may be arranged between the front end of the first storage portion and the rear end of the cover and along the outer circumference of the second storage portion. Further, the cover is provided with at least one slit extending along the axial direction of the marker refill, and the second storage portion is provided with at least one projection on its outer periphery, and the projection is located in the slit. and the protrusion moves along the slit, the movement of the cover relative to the ink containing portion may be guided. In the above case, the same effects as those of the retractable writing instrument described above can be obtained.

In the above marker refill, the ink composition contained in the ink containing portion is preferably an ink composition containing a colorant, a water-soluble organic solvent having a boiling point of 140° C. or higher, and water. Alternatively, the ink composition stored in the ink storage part is preferably an ink composition containing a colorant, a water-soluble organic solvent having a saturated vapor pressure of 20 Pa or less at 25°C, and water. In any of the above ink compositions, the content of the water-soluble organic solvent is 50% by mass or more based on the total amount of the ink composition, and the content of water is 5 to 45% by mass based on the total amount of the ink composition. may be Also in this case, the same effects as those of the retractable writing instrument described above can be obtained. In this marker refill, the ink composition may have a viscosity of 5.0 to 30.0 mPa·s at 25°C. In this case, the ink composition can be suitably used as a padding type marker.

In the above marker refill, the water-soluble organic solvent contained in the ink composition is a group consisting of glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, triethanolamine, and polyethylene glycol having an average molecular weight of 600 or less. It is preferable to include at least one more selected one. By including these water-soluble organic solvents in the ink composition, it becomes easier to obtain a writing instrument capable of forming a scratch-free writing line even after the pen tip is exposed to air for a long period of time. In the ink composition, the colorant may contain at least one selected from the group consisting of acidic dyes, basic dyes, direct dyes, surfactant-dispersed pigments, and self-dispersed pigments. .

According to the present invention, there is provided a retractable writing instrument having a marker core as one of the cores, and a retractable writing instrument that does not stain the tip of the writing instrument when it is retracted, and a marker refill used for such a retractable writing instrument. be able to.

FIG. 1 is a cross-sectional view showing the internal structure of a retractable writing instrument according to an embodiment of the present invention, and FIG. FIG. 1(b) is a cross-sectional view during operation in which one core protrudes from the barrel. FIG. 2 is a perspective view showing a core of a marker of the retractable writing instrument shown in FIG. 1. FIG. FIG. 3 is a perspective view showing a cover that is one part of the core of the marker shown in FIG. 2; FIG. 4(a) is a cross-sectional view of the marker core shown in FIG. 2, and FIG. 4(b) is a cross-sectional view of a refill product in which a cap is fitted to the marker core. FIG. 5 is a cross-sectional view showing an enlarged tip portion of the retractable writing instrument shown in FIG. FIG. 6 is an enlarged cross-sectional view of the distal end portion of the retractable writing instrument shown in FIG. 1, showing a state in which the core of the marker protrudes from the barrel during operation. FIG. 7 is an overall cross-sectional view showing a state (during operation) in which the core of the marker of the retractable writing instrument shown in FIG. 1 protrudes from the barrel.

Hereinafter, a retractable writing instrument according to an embodiment of the present invention and a replacement marker refill used for the retractable writing instrument will be described with reference to the drawings. In the following description, the same reference numerals may be used for the same elements or elements having the same functions, and redundant description will be omitted. In addition, “front/front” means one side of the barrel in the axial direction and the tip direction of the retractable writing instrument, and “back/rear” means the other side of the barrel in the axial direction and the retractable type. It means the rear end side opposite to the tip direction of the writing instrument.

FIG. 1 is a cross-sectional view showing the internal structure of a retractable writing instrument according to one embodiment of the present invention. As shown in FIGS. 1(a) and 1(b), a retractable writing instrument 1 includes a barrel 2 including a front barrel 3 and a rear barrel 4, a mechanical pencil core 5, a ballpoint pen core 6, a clip 7, and A slide piece 8 is provided. The retractable writing instrument 1 further includes a marker core 10 for a highlighter pen. The front end of the slide piece 8 for knock operation is inserted into the rear end of the marker core 10, and the clip 7 interlocked with the slide piece 8 is moved forward (to the left in the drawing) to move the marker core 10. It is configured to protrude outward from an opening 3a (first opening) of the barrel 2 (front shaft 3) (see FIG. 7). When knocking is released, the marker core 10 returns to its initial position within the barrel 2 (see FIG. 1(a)). In this manner, the marker center core 10 can appear and retract from the barrel 2 . The shaft cylinder 2 (rear shaft 4) is provided with an opening for exposing the projection on the outer periphery of the slide piece 8. By moving the projection in the opening, the above-mentioned forward and backward movement is achieved. It is possible to move to

In the retractable writing instrument 1, the marker core 10 is housed in the cylindrical shape of the barrel 2 along with the other cores such as the mechanical pencil core 5 and the ballpoint pen core 6 so as to be substantially even in the circumferential direction. ing. Like the marker core 10, the mechanical pencil core 5 and the ballpoint pen core 6 are connected to individual slide pieces, respectively. It is configured to selectively protrude outward (see FIG. 1(b)). Like the marker core 10, each center core protruding from the barrel returns to its initial position within the barrel 2 when knocking is released (see FIG. 1(a)). For the retractable mechanism described above, a conventional retractable mechanism described in, for example, JP-A-2016-068494 and JP-A-2016-168748 can be used, so detailed description thereof will be omitted. In addition, in the example of the retractable writing instrument shown in FIG. 1, as the core, in addition to the marker core 10, a mechanical pencil core 5 and a ballpoint pen core 6 are housed in the barrel 2, and one core is selectively used. Although it is configured to be retractable, it may be configured to store the marker core 10 and two ballpoint pen cores 6 (for example, cores of different colors) in the barrel 2, or a plurality of marker cores 10 (for example, color different cores) may be stored in the barrel 2, and the number of cores to be stored may be two or more including the marker core 10, and is limited to three cores. Instead of one, four or the like may be used.

Next, a detailed configuration of the marker core 10 will be described with reference to FIGS. 2 to 4. FIG. FIG. 2 is a perspective view showing the marker core 10 of the retractable writing instrument 1 shown in FIG. FIG. 3 is a perspective view showing the cover 14 which is one part of the marker core 10. As shown in FIG. 4A is a cross-sectional view of the marker core 10, and FIG. 4B is a cross-sectional view of a refill product in which the cap 17 is fitted to the marker core 10. FIG.

The marker core 10 is a core used as, for example, a fluorescent marking pen, and includes an ink tank 11 (ink containing portion), a batting 12, a pen tip 13, a cover 14, a cover spring 15 (elastic member), and a tail plug. 16. The ink tank 11, batting 12, nib 13, cover 14, and tail plug 16 are made of a predetermined plastic material such as polypropylene (PP), polyester, polyacetal (POM), or the like.

The ink tank 11 has a cylindrical shape and includes a main tank portion 11a (first storage portion) on the rear end side and a pen tip insertion portion 11b (second storage portion) located on the front end side and having a smaller outer diameter than the main tank portion 11a. storage section). The main tank portion 11a of the ink tank 11 is provided with an opening at its rear end, through which a filling 12 having an ink composition such as water-based ink occluded between fibers is inserted, and the filling 12 is inserted therein. Store in As a result, the ink composition for the marking pen is accommodated in the ink tank 11 (main tank portion 11a). The opening at the rear end of the ink tank 11 is sealed with a tail plug 16 after the filling 12 is inserted. A mounting hole 16a is provided in the tail plug 16, and the tip of the slide piece 8 is inserted into the mounting hole 16a. The slide piece 8 allows the marker core 10 to be easily removed from the mounting hole 16a so that the marker core 10 can be replaced.

A pen tip 13 is inserted into a pen tip insertion portion 11 b on the tip end side of the ink tank 11 , and the pen tip 13 is attached to the ink tank 11 . The pen tip 13 is inserted into the ink tank 11 to a position where the rear end portion enters the batting 12 and is fixed to the ink tank 11 . The pen tip 13 is a tip member having a substantially cylindrical core extending along the axial direction. It is a member used for writing. As the pen tip 13, for example, a coated tip having a POM coating on the tip can be used.

A cover 14 is arranged outside the pen tip 13 . The cover 14 has a substantially cylindrical shape, and is arranged outside the pen tip 13 when the retractable writing instrument 1 is not operated to project the core 10 of the marker to the outside (initial state). The part (tip part) of the tip 13 that is exposed forward from the ink tank 11 is substantially completely covered. Further, an opening 14a (second opening) is provided at the tip of the cover 14, and as will be described later, when the marker center core 10 is operated to move forward within the barrel 2, The tip of the pen tip 13 is configured to protrude from the opening 14a. The pen tip 13 of the marker core 10 is covered by the cover 14 when it is stored in the barrel 2 and is not operated. It is configured to move backward relative to the pen tip 13 so that the tip of the pen tip 13 protrudes from the opening 14 a of the cover 14 .

The cover 14 has a large diameter portion 14b (first cover portion) on the rear end side and a small diameter portion 14c (second cover portion) having an outer diameter smaller than that of the large diameter portion 14b. The pen tip 13 is covered from the large diameter portion 14b of the cover 14 to the small diameter portion 14c. The cover 14 is provided with a pair of slits 14d at positions substantially opposite to each other in the circumferential direction. A part of the internal pen tip 13 can be seen through the slit 14d. A pair of projections 11c provided on the outer periphery of the pen tip insertion portion 11b of the ink tank 11 are positioned in contact with the rear end of each slit 14d. A gap S is provided between the inner periphery of the cover 14 (large diameter portion 14b) and the outer periphery of the pen tip 13 (see FIG. 4A). The width of the gap S along the radial direction is, for example, 0.5 mm or more, and a sufficiently large gap is formed between the two.

A cover spring 15 is arranged between the rear end of the cover 14 and the front end of the main tank portion 11 a of the ink tank 11 . The cover spring 15 is positioned on the outer periphery of the pen tip insertion portion 11 b of the ink tank 11 . The cover spring 15 biases the cover 14 forward with respect to the main tank portion 11a. The marker core 10 is configured so that the cover 14 cannot move further forward due to the protrusion 11c positioned in the slit 14d. are placed in The cover spring 15 allows the cover 14 to move relative to the pen tip 13 when the marker core 10 moves forward, that is, when the pen tip 13 protrudes outward from the opening 3 a of the barrel 2 . is compressed as it moves backwards. When the knock is released, the compressed cover spring 15 restores the cover 14 to cover the pen tip 13. - 特許庁

FIG. 4(b) shows a cross section of a marker refill 10a having substantially the same configuration as the marker core 10 having the above configuration. That is, the marker refill 10a includes an ink tank 11, a batting 12, a pen tip 13, a cover 14, a cover spring 15, and a tail plug 16 in the same manner as the marker core 10. This is a refill product for replacing the core after the ink composition contained in the core 10 has been used up. In FIG. 4B, the marker refill 10a is configured to further include a cap 17 to prevent the ink from drying. does not have to be Further, the cap 17 may not be provided even when the marker refill 10a is individually wrapped with a plastic film or the like.

Next, in the retractable writing instrument 1 having the marker core 10 having the above configuration, the operation of each configuration when performing an operation to move the pen tip 13 of the marker core 10 out of the barrel 2 will be described with reference to FIG. 7 will be described with reference to FIG. FIG. 5 is a cross-sectional view showing an enlarged tip portion of the retractable writing instrument 1, which is a view when not in operation. FIG. 6 is an enlarged cross-sectional view of the distal end portion of the retractable writing instrument 1, showing a state in which the core 10 of the marker protrudes from the barrel 2 during operation. FIG. 7 is an overall cross-sectional view showing a state in which the marker core 10 of the retractable writing instrument 1 protrudes from the barrel 2 (during operation).

First, as shown in FIG. 5 , the pen tip 13 of the marker core 10 is completely covered with the cover 14 before the operation of pulling out the marker core 10 (at the time of non-operation). After that, when the marker core 10 is moved out of the opening 3a of the barrel 2, the marker core 10 first moves forward without being operated. Then, the tip of the marker core 10 , that is, the tip of the small diameter portion 14 c of the cover 14 contacts the inner peripheral surface 3 b of the front shaft 3 of the barrel 2 . After that, when the marker core 10 is moved further forward, the tip of the small diameter portion 14c is guided along the inner peripheral surface 3b and moves to the opening 3a.

Since the inner diameter of the opening 3a is smaller than the outer diameter of the small diameter portion 14c, movement of the small diameter portion 14c is restricted here. When the marker core 10 is further moved forward from this restricted position, the cover 14 moves rearward relative to the pen tip 13 as shown in FIGS. As it moves forward, the tip of the pen tip 13 protrudes out of the barrel 2 through the opening 14a provided in the small diameter portion 14c of the cover 14 and the opening 3a of the barrel 2 in order. At this time, the cover spring 15 is compressed. Thereafter, when a predetermined writing operation is completed and the knock is released, the compressive force of the cover spring 15 causes the movement opposite to the projecting movement, and the marker core 10 returns to its initial state.

As described above, according to the retractable writing instrument 1 according to the present embodiment, the cover 14 is provided to cover the pen tip 13 of the marker core 10 when not operated, and the pen tip 13 moves out of the barrel 2 when operated. At this time, the cover 14 moves backward relative to the pen tip 13 so that the tip of the pen tip 13 protrudes from the cover. Therefore, the pen tip 13 of the marker core 10 is substantially covered with the cover 14 until it comes out of the barrel 2, so that the pen tip 13 does not come into contact with the inner peripheral surface 3b of the barrel 2. As a result, according to the retractable writing instrument 1, the tip of the retractable writing instrument 1 can be kept clean when the pen tip 13 is retracted. In addition, since the tip of the retractable writing instrument 1 is not soiled in this way, even if the user puts this writing instrument in a pocket of his or her clothes, it is possible to prevent his clothes from being soiled.

In the retractable writing instrument 1 , the marker medium 10 further has a cover spring 15 arranged between the ink tank 11 and the cover 14 , and the cover spring 15 moves the cover 14 forward with respect to the ink tank 11 . energized. For this reason, the pen tip 13 is covered with the cover 14 when the marker core 10 is stored in the barrel 2 and is not operated (initial state), so that the pen tip 13 of the marker core 10 is outside the barrel 2. A simple mechanism can be used to move the pen tip 13 out of the cover 14 (that is, move the cover 14 backward with respect to the pen tip) when protruding.

Further, in the retractable writing instrument 1, the ink tank 11 includes a main tank portion 11a on the rear end side and a pen tip insertion portion 11b on the tip side having an outer diameter smaller than that of the main tank portion 11a, and the cover 14 has a cylindrical shape. may be A cover spring 15 is arranged between the front end of the main tank portion 11a and the rear end of the cover 14 and along the outer periphery of the pen tip insertion portion 11b. Therefore, the structure of the marker core 10 including the cover spring 15 can be made compact, and the size of the retractable writing instrument 1 can be made suitable for writing without making the barrel 2 unnecessarily large. It becomes possible.

In the retractable writing instrument 1, the cover 14 is provided with a pair of slits 14d extending along the axial direction of the barrel 2, and the pen tip insertion portion 11b is provided with a pair of projections 11c on the outer periphery thereof. It is The movement of the cover 14 relative to the ink tank 11 is guided by the projections 11c being positioned within the slits 14d and moving along the slits 14d. With this configuration, the movement of the pen tip 13 from the tip of the cover 14 can be made more reliable, and the cover 14 can more reliably prevent the tip of the writing instrument from being soiled by the pen tip 13 .

Further, in the retractable writing instrument 1, a gap S is provided between the inner circumference of the cover 14 and the outer circumference of the pen tip 13, and the width of the gap S along the radial direction may be 0.5 mm or more. . When the gap S between the inner circumference of the cover 14 and the outer circumference of the pen tip 13 is narrow, the ink from the pen tip 13 tends to flow through the gap and flow out of the pen tip 13 due to capillary action. and the pen tip 13, it is possible to prevent ink leakage from the pen tip 13 by providing a certain width of the gap S. FIG. As a result, it is possible to prevent the ink from the pen tip 13 from accumulating inside the cover 14 and staining the tip of the barrel 2 with the ink. In addition, since the gap S allows the movement of the cover 14 with respect to the pen tip 13 to have some play, it is also possible to make the movement of the pen tip 13 appearing and retracting from the barrel 2 smooth. becomes.

In the retractable writing instrument 1, the cover 14 includes a large diameter portion 14b on the rear end side and a small diameter portion 14c on the tip side having an outer diameter smaller than that of the large diameter portion 14b. For this reason, while maintaining the function of covering the pen tip 13, the outer diameter of the cover 14 on the tip side is reduced, so that the pen tip 13 is moved to a position closer to the tip of the barrel 2 while being covered with the cover 14.例文帳に追加becomes possible. As a result, it is possible to further prevent the inner peripheral surface 3b of the barrel 2 from being soiled by the ink from the pen tip 13. FIG.

In the retractable writing instrument 1, the tip of the cover 14 moves forward along the inner peripheral surface 2b of the barrel 2 when the pen tip 13 is protruded from the opening 3a of the barrel 2. Preferably, the movement of the pen tip 13 is guided by. In this case, it is possible to move the pen tip 13 to a position closer to the tip of the barrel 2 while the cover 14 covers the pen tip 13 . As a result, it is possible to further prevent the inner peripheral surface 2b of the barrel 2 from being soiled by the ink from the pen tip 13. FIG.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments and can be applied to various embodiments. For example, in the above embodiment, the padding type marking pen was described as an example, but the present invention may be applied to a direct liquid type marking pen. In the above-described embodiment, the ink stored in the ink tank 11 has been described as an example in which the ink for a general highlighter pen is used. It is good also as a thing of composition like this. As a result, the ink composition of the retractable writing instrument 1 can be kept from being scratched for a long period of time, eliminating the need to provide a cap or the like on the tip.

Here, a modified example of the ink composition of the water-based ink used for the retractable writing instrument 1 described above will be described. As the ink composition according to this modification, an ink composition containing a colorant, a water-soluble organic solvent having a boiling point of 140° C. or higher, and water can be used. The boiling point here refers to the normal boiling point at 1 atmosphere (101325 Pa). A water-soluble organic solvent is an organic solvent having a solubility in water at 20° C. of, for example, 15 g/100 mL or more, preferably 30 g/100 mL or more. The ink composition may contain a water-soluble organic solvent having a saturated vapor pressure of 20 Pa or less at 25°C instead of the water-soluble organic solvent having a boiling point of 140°C or more.

The water-soluble organic solvent is preferably alcohol or its alkyl ether. The alcohol is preferably a polyhydric alcohol, more preferably a dihydric alcohol or a trihydric alcohol. Examples of the water-soluble organic solvent include ethylene glycol, propylene glycol, glycerin, polyethylene glycol (PEG), diethylene glycol, triethanolamine, 1,3-butylene glycol, triethylene glycol monobutyl ether, diethylene glycol monoisopropyl ether, diethylene glycol mono isobutyl ether, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, polyoxyalkylene ether, dipropylene glycol monomethyl ether, polyoxyalkylene alkyl ether, dimethyltriglycol, N-ethyldiethanolamine, mono-n -butyldiethanolamine, polypropylene glycol, triethylene glycol, and bisethoxydiglycol succinate. These water-soluble organic solvents can be used alone or in combination of two or more.

The water-soluble organic solvent may contain at least one selected from the group consisting of glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, triethanolamine, and polyethylene glycol having an average molecular weight of 600 or less. preferable. By including the water-soluble organic solvent in the ink composition, it becomes easier to obtain a writing instrument capable of forming a writing line without blurring even after the pen tip is exposed to the air for a long period of time. In addition, it is preferable that the average molecular weight of the polyethylene glycol is 150 or more. The boiling points and vapor pressures of several solvents are summarized in Table 1 below. “PEG200” in Table 1 is polyethylene glycol with an average molecular weight of 180-220.

The ink composition according to this modification preferably contains both a dihydric alcohol and a trihydric alcohol as the water-soluble organic solvent, and more preferably contains glycerin as the trihydric alcohol. When the ink composition contains glycerin, it tends to be possible to further suppress strike-through of writing lines on the penetrating surface.

When the ink composition contains glycerin, the viscosity tends to be particularly high, and although there is no problem with a direct liquid type writing instrument, the viscosity may fall outside the preferred viscosity range for a batting type writing instrument. However, when the ink composition contains a dihydric alcohol together with glycerin, it is possible to achieve the viscosity of the ink composition suitable for a batting type writing instrument while obtaining the strike-through suppressing effect of glycerin. Ethylene glycol is preferably used as such a dihydric alcohol. When the ink composition contains the mixed solvent, the glycerin content is preferably 70% by mass or less, more preferably 50% by mass or less, and 30% by mass or less with respect to the total amount of the water-soluble organic solvent. is more preferred. Moreover, the glycerin content is preferably 5% by mass or more, more preferably 10% by mass or more, relative to the total amount of the water-soluble organic solvent. The glycerin content relative to the total amount of the water-soluble organic solvent may be 30% by mass or more, 50% by mass or more, or 70% by mass or more.

In the ink composition according to this modification, the content of the water-soluble organic solvent is 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass, based on the total amount of the ink composition. % or more. When the ink composition contains 50% by mass or more of the water-soluble organic solvent, it is possible to obtain a writing instrument capable of forming a writing line without blurring even after the pen tip is exposed to the air for a long time. . The content of the water-soluble organic solvent can be, for example, 90% by mass or less based on the total amount of the ink composition.

The ink composition according to this modification contains water, and the water content is 5 to 45% by mass, preferably 5 to 40% by mass, more preferably 5 to 40% by mass, based on the total amount of the ink composition. It is 5 to 35% by mass, more preferably 5 to 25% by mass. The ink composition according to the present embodiment contains 50% by mass or more of a water-soluble organic solvent having hygroscopicity, and when the ink composition in the writing instrument absorbs moisture, ink leakage may occur. The problem of ink leakage due to hygroscopicity is remarkable when ethylene glycol, glycerin, or the like, especially ethylene glycol, is used as the water-soluble organic solvent. However, by containing 5% by mass or more of water in the ink composition, subsequent moisture absorption can be suppressed, and the occurrence of ink leakage can be suppressed over a long period of time. Further, when the water content is 45% by mass or less, it becomes easier to obtain a writing instrument capable of forming a writing line without blurring even after the pen tip is exposed to the outside air for a long time.

When the content of glycerin relative to the total amount of the water-soluble organic solvent is 70% by mass or more, the content of water is preferably 35 to 45% by mass based on the total amount of the ink composition. When the ink composition contains 35% by mass or more of water, even when the glycerin content is high, the increase in the viscosity of the ink composition can be suppressed, and the ink composition can be easily discharged from the marking pen. Become.

In the ink composition according to this modification, the colorant may include at least one selected from the group consisting of acidic dyes, basic dyes, direct dyes, surfactant-dispersed pigments, and self-dispersed pigments. can. The content of the colorant can be, for example, 0.5 to 5.0% by mass based on the total amount of the ink composition.

The ink composition according to this modification contains the above-described components, a solvent other than the water-soluble organic solvent and water, a preservative, a pH adjuster, and a thickener, as long as the effects obtained in the present embodiment are not impaired. , antiseptic agents (antifungal agents), lubricants, and surfactants. The ink composition preferably does not contain a resin. The non-volatile content is preferably 0.1 to 10% by mass, more preferably 0.1 to 5.0% by mass, based on the total amount of the ink composition. Since the ink composition does not contain a resin or has a non-volatile content of 10% by mass or less, it is possible to form writing lines without blurring even after the pen tip is exposed to the air for a long time. Easier to get writing utensils.

The viscosity of the ink composition according to this modification is preferably 5.0 to 30.0 mPa·s at 25° C. when the ink composition is used for a batting type marking pen, for example. Further, when the ink composition is used for a direct liquid marking pen, the viscosity is preferably 5.0 to 100.0 mPa·s at 25°C.

The ink composition of this modification is obtained by mixing the water-soluble organic solvent, colorant, water, and optional additives using a stirrer such as a dissolver, Henschel mixer, or homomixer. The stirring conditions of the stirrer are not particularly limited. For example, by using a dissolver stirrer and stirring at a rotation speed of 100 to 1000 rpm for 30 to 180 minutes, an ink composition in which each component is uniformly dispersed can be obtained.

DESCRIPTION OF SYMBOLS 1... Retractable writing instrument, 2... Axle tube, 3... Front shaft, 3a... Opening (first opening), 3b... Inner peripheral surface, 4... Rear shaft, 7... Clip, 8... Slide piece, 10... Marker core, 10a... marker refill, 11... ink tank (ink storage part), 11a... main tank part (first storage part), 11b... pen tip insertion part (second storage part), 12... batting, 13... pen Tip 14 Cover 14a Opening (second opening) 14b Large diameter portion (first cover portion) 14c Small diameter portion (second cover portion) 14d Slit 15 Cover spring (elastic Element).

Claims (12)

a barrel having a first opening at its tip;
a core that is housed in the barrel and that can be retracted from the first opening;
A haunting writing instrument comprising
The core has an ink containing portion that contains an ink composition, the pen tip attached to the tip of the ink containing portion, and a cover that covers the pen tip and has a second opening at the tip. death,
The core is configured such that the pen tip is covered with the cover when the retractable writing instrument is not operated, and the pen tip moves out of the barrel when the retractable writing instrument is operated. When the cover moves backward relative to the pen tip, the tip of the pen tip protrudes outward from the second opening of the cover,
When the pen tip is protruding from the first opening of the barrel, the tip of the cover moves forward along the inner peripheral surface of the barrel, thereby moving the pen tip. A haunting writing instrument that guides you. The core further has an elastic member disposed between the ink containing portion and the cover, and the elastic member biases the cover forward with respect to the ink containing portion.
The retractable writing instrument according to claim 1. The ink storage section includes a first storage section on the rear end side and a second storage section on the front end side having an outer diameter smaller than that of the first storage section,
The cover has a cylindrical shape,
The elastic member is arranged between the front end of the first storage portion and the rear end of the cover and along the outer circumference of the second storage portion,
The retractable writing instrument according to claim 2. The cover is provided with at least one slit extending along the axial direction of the barrel,
At least one protrusion is provided on the outer periphery of the second storage portion,
The movement of the cover relative to the ink storage section is guided by the projection being positioned within the slit and the projection moving along the slit.
The retractable writing instrument according to claim 3. A gap is provided between the inner periphery of the cover and the outer periphery of the pen tip, and the width of the gap along the radial direction is 0.5 mm or more.
The retractable writing instrument according to any one of claims 1 to 4. The cover includes a first cover portion on the rear end side and a second cover portion on the front end side having an outer diameter smaller than that of the first cover portion.
The retractable writing instrument according to any one of claims 1 to 5. The ink composition stored in the ink storage part is an ink composition containing a colorant, a water-soluble organic solvent having a boiling point of 140° C. or higher, and water, or an ink composition containing a colorant and a saturation of 20 Pa or less at 25° C. An ink composition containing a water-soluble organic solvent having a vapor pressure and water,
The content of the water-soluble organic solvent is 50% by mass or more based on the total amount of the ink composition, and the content of the water is 5 to 45% by mass based on the total amount of the ink composition.
The retractable writing instrument according to any one of claims 1 to 6. The ink composition has a viscosity of 5.0 to 30.0 mPa s at 25°C.
The retractable writing instrument according to claim 7. The water-soluble organic solvent contains at least one selected from the group consisting of glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, triethanolamine, and polyethylene glycol having an average molecular weight of 600 or less. Item 9. The retractable writing instrument according to item 7 or 8. A marker refill used for a haunting writing instrument,
an ink storage unit that stores the ink composition;
a pen tip attached to the tip of the ink storage portion;
a cover that covers the pen tip and has an opening at the tip;
an elastic member that biases the cover forward with respect to the ink storage portion;
In the initial state of the marker refill, the pen tip is covered with the cover, and when the cover moves rearward from the initial state against the biasing force of the elastic member, the configured so that the pen tip protrudes out from the opening of the cover,
The ink storage section includes a first storage section on the rear end side and a second storage section on the front end side having an outer diameter smaller than that of the first storage section,
the cover is provided with at least one slit extending only along the axial direction of the marker refill;
At least one protrusion is provided on the outer periphery of the second storage portion,
The marker refill, wherein the projection is positioned within the slit and moves along the slit, thereby guiding only movement of the cover along the axial direction with respect to the ink containing portion. The ink composition stored in the ink storage part is an ink composition containing a colorant, a water-soluble organic solvent having a boiling point of 140° C. or higher, and water, or an ink composition containing a colorant and a saturation of 20 Pa or less at 25° C. An ink composition containing a water-soluble organic solvent having a vapor pressure and water,
The content of the water-soluble organic solvent is 50% by mass or more based on the total amount of the ink composition, and the content of the water is 5 to 45% by mass based on the total amount of the ink composition.
A marker refill according to claim 10 . The water-soluble organic solvent contains at least one selected from the group consisting of glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, triethanolamine, and polyethylene glycol having an average molecular weight of 600 or less. Item 12. A marker refill according to Item 11 .

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