JP6301580B2 - Thermochromic writing instrument - Google Patents

Description

  The present invention provides a rubber-like elasticity capable of rubbing the handwriting of the thermochromic ink on one end of the cylindrical body constituting the writing instrument and thermally changing the handwriting of the thermochromic ink by the frictional heat generated at that time. The present invention relates to a thermochromic writing instrument comprising a friction body made of a soft resin.

  Conventionally, a rubber-like elasticity that is provided on one end of a cylinder constituting a writing instrument and that can rub the handwriting of the thermochromic ink and thermally change the handwriting of the thermochromic ink by the frictional heat generated at that time. JP-A 2009-90566 discloses "friction body" and the like about a friction body made of a soft resin having the above.

  In addition, in Japanese Patent Laid-Open No. 2009-90566 “Friction body”, the contact portion has a non-circular shape (for example, an ellipse, a rectangle, or a line), and a small area of the handwriting of the thermochromic ink is to be discolored. And a structure for selecting a rubbing direction in a case where it is desired to thermally discolor a large area of the handwriting of the thermochromic ink.

JP 2009-90566 A

  By the way, when rubbing the handwriting of the thermochromic ink, the friction body is often brought into contact with the paper surface without being particularly conscious, and thereafter, it is thermally discolored by rubbing in the vertical direction, the horizontal direction, and the like.

  On the other hand, when the friction body of Patent Document 1 is attached to a cap or shaft cylinder of a writing instrument, a case where it is desired to thermally change a small area of the handwriting of the thermochromic ink and a large area of the handwriting of the thermochromic ink. In order to select the direction of friction in the case where heat discoloration is desired, the friction body must be rubbed in a specific direction from the contacted portion, and the clip, operation body, anti-rotation protrusion, etc. When using the friction body attached to the rear part, there is a problem that it is difficult to adjust the angle and rotation direction of the cylinder, and it is sometimes difficult to select the direction of friction.

  The present invention has been made in view of these conventional techniques, and it is desired to thermally change a small area or a thin width of a handwriting of a thermochromic ink, or a large area or a thick width of a handwriting of a thermochromic ink. An object of the present invention is to provide a thermochromic writing instrument capable of rubbing the handwriting according to the purpose, for example, when it is desired to make the thermochromic.

In order to solve the above-mentioned problem, the present invention accommodates the cursive body accommodated in the shaft cylinder by slidably energizing the elastic body toward the rear end direction of the shaft cylinder, The writing tip of the writing body can be made to appear and disappear from the tip opening of the shaft cylinder by operating the protruding and retracting mechanism, and the handwriting of the thermochromic ink is rubbed on the rear end of the shaft cylinder, A thermochromic writing instrument comprising a friction body having a friction portion made of a soft resin having a rubber-like elasticity capable of thermally changing the handwriting of the thermochromic ink with frictional heat generated at the time, An outer cylindrical body is detachably attached to the outside of the side surface, and the outer cylindrical body rubs the handwriting of the thermochromic ink at least on the rear end, and the thermal discoloration is caused by frictional heat generated at that time. Made of a soft resin with rubber-like elasticity that can discolor the handwriting of water-based inks Becomes a friction portion, the second friction portion is a through hole, and the rear end portion than the through holes of closing the rear end, has a cylindrical side surface, the second friction portion, the It covers the entire side surface and rear end of the friction part of the friction body. In addition, in this invention, one shows the front or back in a longitudinal direction, and the other shows the opposite direction.

Further, the inner cylinder and / or the side surface of the outer cylinder body is made of a hard resin, and has a hard mounting portion to be mounted on the shaft cylinder .

  Furthermore, a fingertip contact portion is provided on a side surface of the outer cylindrical body, and the fingertip contact portion is formed of a hard resin.

  Further, the lightness of the outer cylindrical body is smaller than the lightness of the friction body.

  According to the first configuration of the present invention, the outer cylindrical body rubs the handwriting of the thermochromic ink on at least one end, and the handwriting of the thermochromic ink is generated by frictional heat generated at that time. If you want to thermally discolor a large area of the handwriting of thermochromic ink by having a second friction part made of a soft resin with rubber-like elasticity that can be thermally discolored, the second friction part of the outer cylinder, thermal discoloration When it is desired to thermally discolor a small area of the handwriting of the conductive ink, it is possible to remove the outer cylinder and use the friction part of the friction body that is narrower than the outer cylinder. This is because the friction part of the friction body is easier to visually recognize the paper surface than the second friction part of the outer cylindrical body, and the width is small, and the small area and narrow width are more likely to be thermally discolored. This is because it can be made easier. Moreover, the effect which relieves a drop impact is also show | played by providing the 2nd friction part which consists of a soft resin which has rubber-like elasticity in the at least one edge part of an outer cylinder.

  Note that the second friction part of the friction body and the outer cylindrical body includes a soft resin having rubber-like elasticity, such as silicone rubber, fluorine rubber, chloroprene rubber, nitrile rubber, polyester rubber, ethylene propylene diene rubber (EPDM). Examples thereof include elastic bodies such as rubbers and elastomers having rubbery elasticity, such as styrene elastomers, ester elastomers, and olefin elastomers, which can be appropriately selected and used. The friction body preferably has a Shore A hardness of 40 or more and 100 or less. Further, it is preferable that the friction portion of the outer cylindrical body is higher than the hardness of the friction body to be used and has a Shore A hardness of 60 or more and 100 or less in consideration of detachability.

  The friction body of the present invention may be provided by fitting, press-fitting, screwing, adhesion, and fusion to a cylindrical body. Further, the friction body may be formed by integrally forming the cylinder body and the friction body by two-color molding by using the cylinder body itself as a friction body. Furthermore, the second friction part of the outer cylinder can be provided by fitting, press-fitting, screwing, adhesion, and fusion to the outer cylinder, and the outer cylinder itself is used as the second friction part. The second friction part may be integrally formed on the body by two-color molding.

  According to the second configuration of the present invention, the outer cylindrical body is formed of a hard resin on the side surface and / or the inner surface, and the outer cylindrical body is provided with a hard mounting portion to be mounted on the cylindrical body. A decrease in the mounting force of the cylinder can be suppressed.

  According to the 3rd structure of this invention, while providing a fingertip contact part in the side surface of the said outer cylinder, forming this fingertip contact part with hard resin suppresses deterioration of a 2nd friction part. Can do. This means that when attaching / detaching the outer cylinder, it is necessary to grasp the outer cylinder with a finger, but hand oil or the like adheres to the part that has grasped the outer cylinder, and the second friction part swells due to this hand oil. There is a risk of malfunction. For this reason, the fingertip contact portion is formed of a hard resin, thereby suppressing the hand oil from adhering to the friction portion.

  As the hard resin used in the present invention, a thermoplastic resin generally known as a member of a writing instrument such as polycarbonate, polypropylene, polyethylene, polystyrene, AS resin, ABS resin, or the like can be used. Further, the hard resin portion may be provided by fitting, press-fitting, screwing, adhesion, and fusion to the friction portion, and it is preferable in terms of cost to integrally form the friction portion and the hard resin by two-color molding. .

According to the fourth configuration of the present invention, since the lightness of the outer cylinder body is smaller than the lightness of the friction body, it is difficult to visually recognize the dirt attached to the friction portion of the outer cylinder body compared to the friction body. It is because it is preferable to do. This is because when the thermochromic writing instrument is carried, the outer cylindrical body exposed to the outside, such as dust attached to the friction part, is easily contaminated. The lightness can be measured with a spectrocolorimeter (Minolta, CM-512m ² ).

  The thermochromic ink used in the present invention is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

  The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium for determining the occurrence temperature of the microcapsule is preferably used.

  The present invention is suitable for the purpose of thermal discoloration of a small area or thin width of a handwriting of a thermochromic ink, or when it is desired to thermally discolor a large area or a thick width of a thermochromic ink. A thermochromic writing instrument capable of rubbing could be provided.

It is a longitudinal cross-sectional view which shows the thermochromic writing instrument of 1st Embodiment. It is a longitudinal cross-sectional view which shows the state which the writing front-end | tip part in FIG. 1 protruded. It is a principal part expanded sectional view in which a part was omitted in FIG. It is a figure which shows an example of the state which uses the friction body in FIG. It is a principal part expanded sectional view which abbreviate | omitted partially which shows the thermochromic writing instrument of Embodiment 2. FIG.

  1 to 3 show a thermochromic writing instrument 1 according to the first embodiment. The thermochromic writing instrument 1 slidably biases a writing body 14 made of a ballpoint pen refill housed in a shaft cylinder toward a rear end of the shaft cylinder main body by a resilient body 11 made of a coil spring. Is housed. The shaft cylinder body includes a front shaft 2, an intermediate shaft 3, a connector 4, and a rear shaft 6. The front shaft 2 and the intermediate shaft 3 are mounted via the connector 4, and the rear end of the intermediate shaft 3 is attached to the rear shaft portion. The shaft cylinder body is obtained by mounting the rear shaft 6 after forming the elongated window hole 6A extending in the longitudinal direction.

  The shaft tube is obtained by screwing the tip member 5 detachably on a male screw portion provided at the tip of the shaft tube main body front shaft 2 considerably with the shaft tube main body and the tip member 5. Furthermore, the engaging projection formed on the rear end portion of the intermediate shaft 3 is dropped into the engaged portion of the outer body 12, and the outer cylinder 12 is externally fitted to the shaft cylinder main body.

  The bullet member 11 is directly received by the tip member 5 and the other end portion (rear end portion) is in direct contact with the chip holder 16 of the writing body 14, so that the writing body 14. Is urged toward the rear end of the shaft main body.

  An elongated window hole 6A extending in the longitudinal direction is provided in the outer peripheral surface of the rear shaft 6 so as to communicate with the inside and the outside in the radial direction, and radially outward from the outer peripheral surface of the rear shaft 6 through the window hole 6A. The operating body 8 is disposed so as to protrude in the direction. The operating body 8 is inserted through the operating portion 8A for mounting the clip 13 protruding outward from the window hole 6A and the long hole 3B of the intermediate shaft 3, so as to move the rotating cam 7 forward and induce rotation. And a shaft portion 8B having a plurality of serrated cam portions (not shown) formed at the tip thereof.

  Further, a resilient member 10 made of a coil spring is disposed between the rear end 8C of the operating body 8 and the protrusion 6B of the rear shaft 6, and the operating body 8 is always connected to the front end opening of the front member 5. It is energized to the 5A side.

  A white translucent friction body 9 having a rubber-like elasticity made of a thermoplastic elastomer is fitted to the rear end portion of the rear shaft 3 and the projection 9B of the friction body 9 is fitted over the projection 6B of the rear shaft 6. It is attached by. Further, the rear end portion of the rear shaft 3 and the outer side of the friction portion 9A of the friction body 9 are composed of a dome-shaped rear end portion and a cylindrical side surface with the rear end closed except for the through hole 20C communicating between the inside and the outside. A black outer cylinder 20 made of thermoplastic elastomer and having rubber-like elasticity is detachably attached to a mounting portion 6C made of a male screw of the rear shaft 6 and a mounting portion 20B made of a female screw on the inner surface of the outer cylindrical body 20. It is detachably attached.

  The retracting mechanism slides the operating body 8 equipped with the clip 13 in the direction of the distal end opening 5A of the tip member 5 to thereby retract and retract by a conventionally known rotating cam including the cam portion of the shaft portion 8B and the rotating cam 7. The mechanism is operated so that the writing tip portion 17 made of a ballpoint pen tip can be projected and retracted from the tip opening portion 5A of the tip member 5.

  When the operation portion of the operating body 4 is slid in the direction of the front end opening 5A of the front member 5 against the biasing force of the projectile body 11 with the writing front end portion 17 immersed in the front end opening 5A of the front member 5. The rotary cam mechanism is activated, and writing can be performed while the writing tip 17 is projected.

  In addition, in the state where the writing tip 17 of the writing body 14 protrudes from the tip opening 5A of the tip member 5, the operation member 8 to which the clip 13 is attached is again resisted against the urging force of the bullet 11. 5, by sliding the cam portion of the shaft portion 8B and the rotary cam 7 in the conventional cam mechanism, the writing tip portion 17 made of a ball-point pen tip is moved. The tip member 5 can be immersed.

  The cursive body 14 has a ball holding chamber, an ink circulation hole in the center of the ball holding chamber, a radial passage that communicates with the ink circulation hole, and an ink circulation groove that does not reach the chip rear hole. A ballpoint pen that can be rotatably held so that a part of the ball protrudes from the tip edge of the chip by placing a φ0.5mm tungsten carbide ball on the bottom wall of the chamber and caulking the tip of the chip inward. A writing tip 17 made of a chip is attached to the tip of the ink containing cylinder 15 via a chip holder 16. A tail plug 19 is attached to the rear end of the ink storage cylinder 15. Further, a spring 18 that constantly presses the ball is disposed behind the ball.

  Although not shown in the drawing, the ink container 15 contains a reversibly thermochromic microcapsule pigment having an average particle size of 0.5 μm on a volume basis by laser analysis. A thermochromic ink having an ink viscosity at 1 rpm of 1020 mPa · s (25 ° C.), an ink viscosity at 100 rpm of 84 mPa · s (25 ° C.) and a shear thinning index of 0.48, and a trailing edge of this ink A grease-like ink follower is directly accommodated.

  When the writing body 14 is written, the ball moves to the bottom wall side due to the rotation of the ball of the writing tip portion 17 and the writing pressure, a gap is formed between the inner wall of the tip end portion of the ball and the ball, and ink is discharged to write. can do.

  In order to replace the writing body 14, the tip member 5 is removed from the front shaft 2, and the tip of the writing body 14 is exposed from the front shaft 2. At this time, since the tip of the projectile 11 is directly received by the tip member 5, by removing the projectile 11 at the same time as the tip member 5, the writing body 14 by the projectile 11 is attached to the rear end of the shaft cylinder. Since the force urging to the side does not work, the operating body 8 is moved to the front shaft 2 side by the elastic member 10 disposed at the rear end portion of the operating body 8, and the writing body 14 is interlocked with the operating body 8. Also move forward. The graffiti body 14 can be removed by grasping and moving the cursive body 14 protruding forward from the front shaft 2. Similarly, in order to replace with a new writing body, a new writing body can be disposed on the shaft cylinder body, and the projectile 11 and the tip member 5 can be mounted and used.

  To thermally discolor the handwriting, as shown in FIG. 4, the rear end portion of the friction portion 9A is located closer to the shaft tube tip portion side in the longitudinal direction than the second friction portion 20A of the outer cylindrical body 20, With the outer cylinder 20 attached, the second friction part 20A of the outer cylinder 20 is pressed against the handwriting written on the writing surface H of a notebook or the like, and the handwriting of the thermochromic ink is applied by the heat generated by rubbing. Can be heat-erased. Further, the outer cylinder 20 is removed, and the friction portion 9A of the friction body 9 having a smaller radial width than the radial width of the outer cylinder 20 is pressed against the handwriting written on the writing surface H such as a notebook, The handwriting of the thermochromic ink can also be thermally decolored by the heat generated by rubbing.

  In FIG. 5, the thermochromic writing instrument 101 of 2nd Embodiment is shown. In the thermochromic writing instrument 101, a black outer cylinder 120 similar to the rear axis that protects the friction body 9 is detachably attached to the rear end of the rear shaft 6, and the outer cylinder is attached to the mounting portion 3C formed of a male screw of the rear shaft 6. A hard mounting portion 120B made of a female screw on the inner surface of the body 120 is screwed. Specifically, the outer cylindrical body 120 is made of a frictional part 120A having rubber-like elasticity made of a thermoplastic elastomer (styrene elastomer) and a hard resin of a thermoplastic resin (polycarbonate) on the side surface. Except for having a fingertip abutting portion 120D gripped by a finger when attaching and detaching, an internal thread portion (hard mounting portion) made of a hard resin of thermoplastic resin (polycarbonate) on the inner surface, and a through-hole 120C communicating with the inside and outside. The thermochromic writing instrument 101 is obtained in the same manner as in the first embodiment.

  To thermally discolor the handwriting, with the outer cylinder 120 attached, the second friction part 120A of the outer cylinder 120 is pressed against the handwriting written on the writing surface of a notebook, etc., and the heat generated by rubbing, The handwriting of the thermochromic ink can be discolored by heat. In addition, the fingertip contact portion 120D of the outer cylinder 120 is grasped, rotated and removed, and the friction portion 9A of the friction body 9 having a smaller radial width than the outer cylinder 120 is written on a notebook or the like. The handwriting of the thermochromic ink can be thermally decolored by the heat generated by pressing and rubbing the handwriting written on the surface.

  In this embodiment, a shaft cylinder is constituted by a shaft cylinder main body and a tip member. For convenience, the shaft cylinder main body is constituted by four parts of a front shaft, an intermediate shaft, a connector, and a rear shaft. The presence or absence of the tip member and the number of parts, such as the two parts of the shaft, are not particularly limited.

  In addition, as a cylinder, a shaft cylinder (rear shaft) of a retractable writing instrument provided with a retracting mechanism composed of a rotating cam is illustrated. However, if the cylinder constitutes the writing instrument, the retracting mechanism such as rotation feeding is particularly It is not limited, You may have a cylinder, a cap, and a knock body of a cap-type writing instrument as a cylinder. Moreover, although the clip is illustrated as an operation body, the shape of an operation body and the presence or absence of a clip are not specifically limited. However, it is preferable to reduce the width of the operation portion and the clip of the operation body to be smaller than the maximum width of the friction body because the handwriting on the writing surface can be easily seen when using the friction body.

  In the present embodiment, for the sake of convenience, the friction body is directly attached to the rear shaft. However, the friction body and the outer cylinder may be provided on the cylinder body through a retracting mechanism such as a knock body.

  Further, when the color of the outer cylinder is substantially the same color or a similar color to the shaft cylinder, it is preferable that a sense of unity between the shaft cylinder and the outer cylinder is easily obtained, but the color of the outer cylinder is not particularly limited. Further, the color of the friction body is not particularly limited, but it is preferable to use colorless and transparent, colorless and translucent color, white, etc., because it leads to cost reduction such as common use of parts.

  Further, in the present embodiment, it is preferable to screw the male thread portion provided on the rear shaft and the female thread portion on the inner surface of the outer cylindrical body, since a decrease in mounting force due to repeated attachment and detachment can be suppressed. As long as the structure protects the friction body, such as fitting or press fitting, the mounting structure of the rear shaft and the outer cylinder is not particularly limited.

  The shape of the outer cylindrical body is not particularly limited, and as in the embodiment, the rear end is generally closed so as to cover the side surface of the friction part of the friction body and substantially the entire rear end part. Although it is most preferable to protect the portion, the shape may be such that the rear end (one end portion) is opened and the open end is the second friction portion. When the opening end of the outer cylinder is the second friction part, the friction part is located on the other end side in the longitudinal direction from one end of the outer cylinder, and the second friction part In use, it is preferable that the friction portion does not easily contact the paper surface.

  The thermochromic writing instrument of the present invention is preferably an in / out type writing instrument in view of convenience, but can be widely used as a thermochromic writing instrument such as a cap-type writing instrument.

DESCRIPTION OF SYMBOLS 1,101 Thermochromic writing instrument 2 Front shaft 3 Intermediate shaft 3A Contact part 3B Long hole 4 Connection tool 5 Front member 6 Rear shaft 6A Window hole 6B Protrusion part 6C Male thread part 7 Rotating cam 8 Operation body 8A Operation part 8B Press part 9, 109 Friction body 9A, 109A Friction part 9B, 109B Protrusion part 10 Elastic member 11 Elastic body 12 Outer cylindrical body 13 Clip 14 Writing body 15 Ink storage cylinder 16 Tip holder 17 Writing tip 19 Tail plug 20, 120 Outside Cylindrical body 20A, 120A Friction part 20B Mounting part 120B Hard mounting part 20C, 120C Through hole 120D Fingertip contact part

Claims (4)

The cursive body accommodated in the shaft cylinder is slidably biased toward the rear end direction of the shaft cylinder by the elastic body, and the writing body is operated by operating the retracting mechanism. The tip portion can be projected and retracted from the tip opening portion of the shaft tube, and the handwriting of the thermochromic ink is rubbed to the rear end portion of the shaft tube, and the thermochromic ink of the thermochromic ink is generated by frictional heat generated at that time. A thermochromic writing instrument comprising a friction body having a friction portion made of a soft resin having rubber-like elasticity capable of thermally discoloring a handwriting, wherein an outer cylindrical body is detachable on the outside of the side surface of the friction body The outer cylindrical body is a rubber-like elastic capable of rubbing the handwriting of the thermochromic ink at least on the rear end and thermally changing the handwriting of the thermochromic ink by frictional heat generated at that time. it has a second friction portion made of a soft resin having a said second friction portion A through hole, a rear end portion other than the through hole and a rear end portion closed, and a cylindrical side surface, wherein the second friction portion is substantially the entire side surface and rear end portion of the friction body. thermochromic writing instrument, characterized in that the covering. The inner surface and / or sides of the outer cylindrical body, made of hard resin, thermochromic writing instrument according to claim 1, characterized in that it comprises a rigid mounting portion for mounting said barrel. The thermochromic writing instrument according to claim 1 or 2, wherein a fingertip abutting portion is provided on a side surface of the outer cylindrical body, and the fingertip abutting portion is formed of a hard resin. The thermochromic writing instrument according to any one of claims 1 to 3, wherein the brightness of the outer cylinder is smaller than the brightness of the friction body.

Images