JP6558982B2 - Thermochromic writing instrument - Google Patents

Description

  The present invention provides a friction portion capable of thermally changing the handwriting of the thermochromic ink by frictional heat generated by rubbing the handwriting of the thermochromic ink at the corner of the outer peripheral surface of the rear end portion of the knock body. Relates to a thermochromic writing instrument.

  Conventionally, from a soft resin that is provided on one end of a cylindrical body constituting a writing instrument, rubs the handwriting of the thermochromic ink, and the handwriting of the thermochromic ink is thermally discolored by frictional heat generated at that time. Such a friction part is disclosed in Japanese Unexamined Patent Application Publication No. 2009-90566, “Friction Body”.

JP 2009-90566 A

  By the way, when the handwriting of the thermochromic ink is rubbed, the friction part is often brought into contact with the paper surface without being particularly conscious, and then the thermochromic ink is rubbed in the left-right direction or the like to be thermally discolored.

  In Patent Document 1, when a friction part is provided in the operation part in a type in which a knock body at the rear end of the shaft cylinder is pressed forward, if a frictional operation is performed using the friction part, a knock body is applied when a pressing force is applied by the paper surface side. May move forward and a stable friction operation may not be performed. In particular, when both the writing tip protruding operation and the writing tip immersing operation employ a type of retracting mechanism (so-called double knock type) that pushes the knock body forward, and a friction portion is provided on the knock body The knock body may rattle in the front-rear direction, and there is a possibility that stable friction operation cannot be performed.

  The present invention is intended to solve the above-described conventional problems, and to provide a thermochromic writing instrument that enables a stable friction operation using a friction portion at the rear end of the knock body. In the present invention, “front” refers to the writing tip, and “rear” refers to the opposite side. In the present invention, the “writing tip portion immersing state” means a state in which the writing tip portion is immersed in the shaft tube, and the “writing tip portion protruding state” means that the writing tip portion is external to the front end of the shaft tube. The state of protruding.

In order to solve the above problems, the present invention provides a writing tip in which a thermochromic ink is contained in an ink containing cylinder, and a writing tip portion capable of discharging the thermochromic ink is provided at a front end portion of the ink containing cylinder. The writing tip is housed in a shaft cylinder so as to be movable in the front-rear direction, a knock body is provided at the rear end of the shaft cylinder, and the knock body is pressed toward the front end opening of the shaft cylinder. Is pushed out from the front end opening of the shaft cylinder, and the knocking body is pushed forward again to release the protruding state of the writing tip and the writing tip is immersed in the shaft cylinder from the front end opening of the shaft cylinder. The thermochromic ink handwriting can be thermally discolored by frictional heat generated by rubbing the thermochromic ink handwriting on the corner of the outer peripheral surface of the rear end of the knock body. A thermochromic writing instrument provided with a friction part, wherein the knock body To the axis of the barrel, with tiltably provided radially on the sidewall of the knock body, provided with a regulating portion comprising a convex and / or concave, the knock body, the writing tip is projected state In which the restricting portion of the knock body is disposed in the rear end portion of the shaft tube and in front of the restricted portion. When the rear end of the knock body is moved toward the paper surface while the writing tip is in a protruding state, the knock body moves rearward, and the restricting portion of the knock body is than the restricted portion positioned rearward when the friction operation using the friction portion, by moving the pushing member in a radial direction, the regulated at the rear end of the restricting portion of said knock body said barrel In contact with the part, the forward movement of the knock body relative to the shaft tube Characterized in that it stop.

Further, the knock body, the writing tip is then arranged to be movable toward the rear end of the shaft tube in immersive state, regulation of the knock body, the writing tip is kept retracted state, When the rear end of the knock body is moved to the paper surface side with the writing front end portion being in the immersion state, the knock body is moved backward in the rear end portion of the shaft cylinder and in front of the regulated portion. It moves, The restriction part of the knock body is located behind the restricted part of the shaft cylinder, It is characterized by the above-mentioned.

  In the thermochromic writing instrument according to the first aspect of the invention, the knock body is provided so as to be tiltable in a radial direction with respect to a shaft center of the shaft cylinder, and a regulating portion having a convex shape and / or a concave shape is provided on a side wall of the knock body. In addition, the control part of the knock body is positioned rearward of the rear end of the shaft cylinder in a state where the rear end of the knock body is on the paper surface side (downward), so that the friction operation using the friction part is performed. At this time, when a radial pressing force is applied to the knock body, the knock body tilts until it comes into contact with the shaft tube. Furthermore, when a pressing force is applied to the front end side of the shaft cylinder, the restricting portion of the knock body comes into contact with the regulated portion at the rear end portion of the shaft cylinder, and the friction portion with respect to the shaft cylinder and the forward direction of the knock body Movement is prevented. As a result, a stable friction operation can be performed using the friction portion provided on the knock body.

  The friction portion includes an elastic material having rubber-like elasticity, such as silicone rubber, fluorine rubber, chloroprene rubber, nitrile rubber, polyester rubber, ethylene propylene diene rubber (EPDM), styrene elastomer, ester elastomer, Examples thereof include elastic bodies such as olefin-based elastomers and the like, rubbers having rubber-like elasticity, and elastomers, which can be appropriately selected and used. Moreover, as a friction part, Shore A hardness 40 or more and 100 or less are preferable, and Shore A hardness 60 or more and 80 or less are more preferable. The elastic material constituting the friction part is not a highly wearable elastic material (for example, an eraser) but a low wear elastic material that hardly generates wear debris during friction.

  Further, the friction portion of the present invention may be integrated with or separate from the knock body as long as it is provided at least at the corner of the outer peripheral surface of the rear end of the knock body. Specifically, it is provided by fitting, press-fitting, screwing, bonding, and fusing to the knock body, the knock body and the friction part are integrally formed by two-color molding, or the knock body itself is constituted by a soft member. There may be. Further, the color of the friction part 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.

  The restricting portion provided on the side wall of the knock body may be provided so as to be always positioned rearward of the restricted portion of the shaft tube regardless of the appearance of the writing tip portion. According to the configuration, the knock body is arranged so that the writing front end portion is movable in a rear end direction of the shaft tube in the protruding state and the immersion state, and the restricting portion of the knock body has the writing front end portion. In the state where it is on the paper surface side, it is located in the rear end portion of the shaft tube, and in the state where the rear end of the knock body is on the paper surface side, it is located behind the rear end portion of the shaft tube, so that the writing tip When the part is used, the knocking operation is performed in a state where the writing tip part is on the paper surface side, and therefore, the knocking part restricting part does not come into contact with the rear end part of the shaft cylinder at the time of the knocking operation, thereby obtaining a smooth knocking operation. be able to. In addition, when using the friction part, the rear end of the knock body is set to the paper surface side, and the self-weight moves toward the rear end of the shaft cylinder. The distance becomes longer and the handwriting visibility can be improved.

  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 was able to provide a thermochromic writing instrument that enables a stable friction operation using the friction part at the rear end of the knock body.

It is a longitudinal cross-sectional view which shows the thermochromic writing instrument of this invention. 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 figure which shows an example of the state which uses the friction part in FIG. It is a principal part expanded sectional view in which a part was omitted in FIG. FIG. 3 is an enlarged cross-sectional view of a main part, partially omitted in FIG. 2. FIG. 4 is an enlarged cross-sectional view of a main part, partially omitted in FIG. 3. It is a principal part expanded sectional view in which a part was omitted showing a 2nd embodiment. It is a principal part expanded sectional view of the state which uses the friction part in FIG.

  1 to 6 show a thermochromic writing instrument 1 according to the first embodiment. The thermochromic writing instrument 1 slidably urges a writing body 14 made of a ballpoint pen refill housed in a shaft cylinder body toward a rear end direction of the shaft cylinder body by an elastic body 7 made of a coil spring. Is housed. The shaft cylinder main body is composed of a front shaft 2 and a rear shaft 3, and the front shaft 2 and the rear shaft 3 are detachably screwed to form a shaft cylinder main body. The rear shaft 3 has a crown 8 having a clip. It is provided.

  The projectile 7 is directly received by the inner wall of the front shaft 2, and the other end (rear end) is in direct contact with the tip holder 12 of the writing body 10 to write. The body 10 is biased toward the rear end direction of the shaft cylinder main body.

  A knock body 5 is disposed at the rear end portion of the rear shaft 3 so as to protrude rearward from the rear end 3A of the rear shaft 3. The knocking body 5 has a plurality of serrated cam portions (not shown) at the front end so as to move the rotating cam 4 forward and induce rotation at the front end portion, and a regulating portion 5A composed of a convex portion on the side wall. Is provided in a circumferential and integral manner.

  Further, a white translucent friction portion 6 having rubber-like elasticity made of a thermoplastic elastomer (styrene elastomer) is formed at the rear end portion (corner portion of the outer peripheral surface) of the knock body 5 with the knock body 5 and two-color molding. Are attached together (heat fusion).

  The knock body 5 is provided so as to be tiltable in the radial direction with respect to the axial center J of the shaft tube, and in a state where the writing tip portion 12 of the writing body 10 is in a protruding state and an immersive state, the It is arranged to be biased rearward by the emitting member 9. Therefore, the regulating portion 5A of the knock body 5 is the regulated portion 3A of the rear shaft 3 in a state where the writing tip portion 12 is on the paper surface H side and a friction portion 6 at the rear end of the knock body 5 is on the paper surface H side. It is provided so that it may be located behind.

  Further, the intruding mechanism is conventionally known which comprises a cam portion (not shown) provided at the front end portion of the knock body 5 and a rotating cam 4 by pressing the knock body 5 in the direction of the front end opening 2A of the front shaft 2. A retracting mechanism using a rotating cam is operated to allow the writing tip 12 made of a ballpoint pen tip to appear and retract from the tip opening 2A of the front shaft 2.

  In addition, with the writing tip 12 of the writing body 10 protruding from the tip opening 2A of the front shaft 2, the knock body 5 is again resisted against the urging force of the projectile 7 and the tip opening of the front shaft 2 is opened. By pushing in the 2A direction, the retracting mechanism by the rotating cam 4 can be operated, and the writing tip 12 can be immersed in the front shaft 2.

  The cursive body 10 has a ball holding chamber, an ink circulation opening at the center of the ball holding chamber, a radial passage that communicates with the ink circulation opening, and an ink circulation groove that does not reach the chip rear opening. A φ0.5 mm tungsten carbide ball is placed on the bottom wall of the ball holding chamber, and the tip end of the tip is crimped inward so that a part of the ball can be rotated so that it protrudes from the tip end edge. A writing tip portion 13 made of a held ballpoint pen tip is attached to the tip portion of the ink containing cylinder 11 via a tip holder 12. Further, a tail plug is attached to the rear end portion of the ink containing cylinder 11. In addition, a spring (not shown) that constantly presses the ball is disposed behind the ball.

  Although not shown, the ink containing cylinder 11 contains a reversibly thermochromic microcapsule pigment having an average particle size (D50) on a volume basis by laser diffraction of 0.5 μm and is rotated by an EM type. A thermochromic ink having an ink viscosity of 1020 mPa · s (25 ° C.) at 100 rpm and an ink viscosity of 84 mPa · s (25 ° C.) at 100 rpm and a shear thinning index of 0.48 in a viscometer, A grease-like ink follower is directly accommodated at the rear end.

  When the writing body 10 is written, the ball moves to the bottom wall side by the rotation of the ball of the writing tip 13 and the writing pressure, a gap is formed between the inner wall of the tip of the tip and the ball, and ink is discharged to write. can do.

  In order to thermally change the handwriting written on the paper surface H, as shown in FIG. 3, the friction portion 6 provided at the corner of the rear end portion of the knock body 5 is pressed against and rubbed with the handwriting written on the paper surface H such as a notebook. The handwriting of the thermochromic ink can be thermally decolored by the heat generated. In this state, when the friction part 6 is pressed against the handwriting, the knock body 5 tilts in the radial direction, and the restricting part 5A (step shape) of the knock body 5 becomes the restricted part 3A (convex shape) of the rear shaft 3. By abutting against the wall surface, the movement of the knock body 5 toward the front end opening 2A of the front shaft 2 is suppressed.

  In the other embodiments shown in FIGS. 7 and 8, the knock body 105 is provided so as to be tiltable in the radial direction with respect to the axis J of the shaft tube, and the writing tip portion 13 of the writing body 10 is in a protruding state and an immersive state. , The rear shaft 103 is arranged so as to be movable in the direction of the rear end 103A. Further, the restricting portion 105 </ b> A of the knock body 105 is positioned in the rear end portion of the rear shaft 103 (FIG. 8) with the writing front end portion 12 on the paper surface H side, and the friction portion 106 at the rear end of the knock body 105. In the state of the paper surface H side, the knock body 105 is provided so as to move to the rear side of the rear shaft 103 due to its own weight and to be positioned rearward of the regulated portion 103B of the rear shaft 103.

  Specifically, when the writing tip is immersed, when the writing tip is on the paper surface H side, the restricting portion 105A of the knock body 105 is located in the rear end of the rear shaft 103, and the rear end of the friction portion 106 is In the state where it is on the paper surface H side, the self-weight of the knock body 105 moves the distance L between the step-shaped restricting portion 105A of the knock body 105 and the step portion of the rear shaft 3 toward the rear end 103A side of the rear shaft 103, The restricting portion 105 </ b> A of the knock body 105 is located behind the restricting portion 103 </ b> B of the rear shaft 103. Similarly, the writing tip 12 functions in the same manner even when it is in a protruding state.

  In this embodiment, the front cylinder and the rear axle constitute a shaft cylinder, but the number of parts such as the front axle, the intermediate axle, the rear axle, etc., the base, the front axle, the rear axle, the head crown, etc. There is no particular limitation. Moreover, the shape of a control part and a to-be-controlled part is not specifically limited, It consists of convex shape and / or concave shape, and there is no limitation in particular, such as a protrusion part, a groove part, and a step part. Furthermore, the shape of the regulated portion is not particularly limited as long as it is a shape in which the regulating portion abuts and the movement is regulated, such as a stepped portion, a protruding portion, a recessed portion, and an opening end of the rear shaft.

  Moreover, although the in-and-out mechanism which consists of a rotating cam is illustrated as an in-and-out mechanism, if it is an in-and-out mechanism in which the writing front-end | tip part can invade by pressing a knock body, an in-and-out mechanism will not be specifically limited. . In addition, the projectile that urges the writing body in the rear end direction of the shaft tube is not limited to the coil spring, but the urging force of the projectile greatly affects the operability of the knock body. In view of the properties and the friction operability, the urging force of the projectile is preferably 500 gf to 800 gf. The urging force of the projectile can be measured with a push-pull scale.

  The thermochromic writing instrument of the present invention can be widely used as a retractable thermochromic writing instrument such as a retractable ballpoint pen and a retractable marker.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Front shaft 2A Front end opening part 3, 103 Rear shaft 3A Rear end 3B, 103B Step part 4, 104 Rotating cam 5, 105 Knock body 5A, 105A Control part 6 Friction part 7 Bullet 8 Head crown 9 Resilient member 10 Cursive body 11 Ink receiving cylinder 12 Tip holder 13 Writing tip

Claims (2)

A thermochromic ink is stored inside the ink storage cylinder, and a writing body provided with a writing tip that can discharge the thermochromic ink at the front end of the ink storage cylinder can be moved back and forth in the shaft cylinder. And providing a knock body at the rear end portion of the shaft cylinder, and pressing the knock body in the direction of the front end opening of the shaft cylinder makes the writing tip end project from the front end opening of the shaft cylinder, And a retracting mechanism for releasing the writing tip projecting state by pressing the knock body forward again so that the writing tip part is sunk into the shaft tube from the front end opening of the shaft tube. A thermochromic writing instrument provided with a friction part capable of thermally changing the handwriting of the thermochromic ink by frictional heat generated by rubbing the handwriting of the thermochromic ink at the corner of the outer peripheral surface of the end part. The knock body can be tilted in the radial direction with respect to the axis of the shaft cylinder Provided with, on a sidewall of the knock body, provided with a regulating portion comprising a convex and / or concave, the knock body, the writing tip portion is movably disposed to the rear end direction of the shaft tube in the protruding state In the state where the restriction part of the knock body is in the protruding state, the writing tip part is located in the rear end part of the shaft tube and in front of the restricted part, and the writing tip part is in the protruding state. When the rear end of the knock body is moved to the paper surface side, the knock body moves rearward, the restricting portion of the knock body is located rearward of the restricted portion of the shaft cylinder, and the friction portion is During the friction operation used, by moving the knock body in the radial direction, the regulating portion of the knock body comes into contact with the regulated portion at the rear end portion of the shaft cylinder, and the front of the knock body with respect to the shaft cylinder Thermochromic writing characterized by blocking movement . The knock body, the writing tip is then arranged to be movable toward the rear end of the shaft tube in immersive state, regulation of the knock body, the writing tip is kept retracted state, the shaft When the rear end of the knock body is moved to the paper surface side with the writing front end portion being in the immersed state, the front end portion is located in the rear end portion of the cylinder and in front of the restricted portion, the knock body moves rearward. 2. The thermochromic writing instrument according to claim 1 , wherein the restricting portion of the knock body is located behind the restricted portion of the shaft tube.

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