JP2014080032A - Thermal discoloration type writing implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal discoloration type writing implement with a built-in thermal discoloration ink that can be immediately brought to a writable state (pen point jutted state) or preserved state (pen point sunk state) even when only one hand can be used, and that makes it possible to immediately proceed to a frictional discoloration work without the necessity of re-holding a penholder with the penholder held in one hand after completion of writing.SOLUTION: At least one writing core 6 and at least one frictional core 7 are stowed in a penholder 2 so that they can be moved back and force. A thermal discoloration ink 63 is stowed in the writing core 6. A pen point 61 through which the thermal discoloration ink 63 can be jetted out is disposed at the front end of the writing core 6. A chip 71 that rubs a trace of the thermal discoloration ink 63 and thermally discolors the trace with frictional heat dissipated at that time is disposed at the front end of the frictional core 7. A jutting and sinking mechanism is included to selectively enable the pen point 61 of the writing core 6 and the chip 71 of the frictional core 7 to be jutted out or sunk through a front-end hole 31 of the penholder.

Description

The present invention relates to a thermochromic writing instrument.

Conventionally, in a thermochromic writing instrument incorporating a thermochromic ink, Patent Document 1 discloses a configuration in which a friction body for thermally discoloring a handwriting by a thermochromic ink by frictional heat is provided on the top of the cap. The structure provided in the rear end is described.

JP 2004-148744 A

Since the conventional thermochromic writing instrument is of the cap type, it is necessary to perform the attaching / detaching operation of the cap with both hands, and when only one hand can be used, it is difficult to quickly put it into a writable state or a storage state. Further, in the case where the conventional thermochromic writing instrument has a configuration in which a friction body is provided at the rear end of the shaft cylinder, when the handwriting by the thermochromic ink is frictionally changed after writing, It is necessary to reverse the shaft from the rear end to the rear end side, and to change the shaft barrel to a large extent.

The present invention solves the above-mentioned conventional problems, and even when only one hand can be used, the writing state (pen tip protruding state) or the storage state (pen tip immersion state) can be quickly achieved. After writing, it is intended to provide a thermochromic writing instrument with built-in thermochromic ink that can quickly shift to frictional discoloration work without changing the shaft cylinder greatly while holding the shaft cylinder in one hand. is there. In addition, the present invention is intended to provide a writing core refill that can be easily distinguished from other writing cores before being housed in the shaft tube. Another object of the present invention is to provide a friction core refill for use in the thermochromic writing instrument that can be easily distinguished from the writing core before being housed in the shaft cylinder.

In the present invention, “front” refers to the side from which the pen tip and tip protrude, and “rear” refers to the opposite side. Further, in the present invention, the “pen nib immersive state” refers to a state in which the pen nib is immersed in the shaft cylinder, and the “pen nib protruding state” refers to a state in which the pen nib projects outside from the front end of the shaft cylinder. Say. In the present invention, the “chip immersion state” means a state where the chip is immersed in the shaft cylinder, and the “chip protruding state” means a state where the chip protrudes outside from the front end of the shaft cylinder.

1st invention of this application is a thermochromic writing instrument which incorporated thermochromic ink, Comprising: At least 1 writing core 6 and at least 1 friction core 7 in the axial cylinder 2 are front-back. The thermochromic ink 63 is accommodated inside the writing core 6, and a nib 61 capable of discharging the thermochromic ink 63 is provided at the front end of the writing core 6. A tip 71 is provided at the front end of the friction core 7 to rub the handwriting of the thermochromic ink 63 and to thermally change the handwriting by frictional heat generated at that time. 61 and the tip 71 of the friction core 7 are provided with a projecting / retracting mechanism that allows the front end hole 31 of the shaft cylinder to be alternatively projected and retracted.

The thermochromic writing instrument 1 according to the first invention includes a pen tip 61 of the writing core 6 and a tip 71 of the friction core 7 (that is, a pen tip of one core body among a plurality of core bodies). 61 or the tip 71) can alternatively be projected and retracted from the front end hole 31 of the shaft cylinder 2, so that it can be quickly written (pen tip protruding state) or stored (pen tip retracted state) with one hand. In addition, after writing, when the handwriting with the thermochromic ink 63 is frictionally discolored, the tip tube 2 can be brought into a protruding state without greatly changing the shaft tube 2 while holding the shaft tube 2 in one hand. Can shift to friction discoloration work. At least one (that is, one or more) of the writing core 6 is accommodated in the shaft cylinder 2, and at least one (that is, one or more) of the friction core 7 is a shaft cylinder. 2 is accommodated.

In the first invention, the intrusion mechanism is provided in the shaft cylinder 2. The in / out mechanism selectively makes the pen tip 61 and the tip 71 appear in / out by an operation such as pressing or rotation of the operation unit 81. The operation portion 81 is provided on the rear end of the shaft tube 2 or the side wall of the shaft tube 2. The operation unit 81 can be operated by the gripped hand while the thermochromic writing instrument 1 is gripped by one hand.

For example, the intruding mechanism projects the pen tip 61 or the tip 71 from the front end hole 31 by projecting the operation portion 81 rearward from the rear end of the shaft cylinder 2 and pressing the operation portion 81 forward. The operation portion 81 is protruded radially outward from the side wall of the shaft cylinder 2 and the operation portion 81 is pushed forward so that the pen tip 61 or the tip 71 is protruded forward (so-called rear end knock type). Projecting outward from the front end hole 31 (so-called side slide type), projecting the operating portion 81 radially outward from the side wall of the shaft cylinder 2, and operating the operating portion 81 in the radial direction of the writing core 6. By pressing the front end of the pendulum 61 or the tip 71 outwardly from the front end hole 31 (so-called side knock type), or the operation unit 81 provided at the rear part of the shaft tube 2 is provided in front of the shaft tube 2. Times against the department It can be mentioned pen tip 61 or the configuration to project the tip 71 to the outside from the front end hole 31 (so-called rotary type) or the like by. The nib 61 may be, for example, a ballpoint pen tip, a fiber bundle resin processed body, a fiber bundle heat-bonded processed body, a felt processed body, a pipe-shaped pen body, a fountain pen type plate pen body having a slit at the tip, Examples thereof include a brush pen body, a porous foam body of a synthetic resin, and an extruded body of a synthetic resin having an ink guide path in the axial direction.

According to a second invention of the present application, in the first invention, the writing core 6 includes a pen tip 61, the pen tip 61 at the front end, and a thermochromic ink 63 stored therein. The nib 61 includes a tube 62, and the pen tip 61 is rotatably held at the front end, and the ball is urged forward by a ball projecting body 65 and is in close contact with the inner surface of the inward front end edge portion. It is a requirement that the friction core body 7 includes a tip 71 made of a soft material and a shaft portion 72 made of a hard material having the tip 71 at the front end.

In the thermochromic writing instrument 1 according to the second aspect of the invention, the pen tip 61 of the writing core 6 is brought into close contact with the inner surface of the inward front end edge portion of the ball urged forward by the ball elastic body 65. Since it is a structure, the evaporation of the ink from the nib 61 of the writing core 6 and the leakage of the ink can be prevented during non-writing. Further, in the thermochromic writing instrument 1 of the second invention, the friction core 7 includes a tip 71 made of a soft material and a shaft portion 72 made of a hard material having the tip 71 at the front end. Friction heat can be easily generated and the handwriting by the thermochromic ink 63 can be quickly discolored, and at the same time, stable operation of the tip 71 of the friction core 7 can be obtained.

According to a third invention of the present application, in the first or second invention, a resilient body 21 that biases the writing core 6 backward and a resilient body that biases the friction core 7 backward. The body 21 is accommodated in the shaft cylinder 2, the operating body 8 is connected to the rear end of the writing core body 6, the operating body 8 is connected to the rear end of the friction core body 7, and the shaft cylinder 2 is connected. A plurality of window holes 41 extending in the front-rear direction are provided in the side wall of the first and second operation holes 8 so as to project radially outward from the respective window holes 41, and one operation body 8 is provided as a window hole. By sliding forward along 41, the pen tip 61 of the writing core 6 or the tip 71 of the friction core 7 corresponding to the one operating body 8 protrudes from the front end hole 31 of the shaft cylinder 2 to the outside. At the same time, the pen tip 61 of the writing core 6 or the tip 71 of the friction core 7 that was in the protruding state is immersed in the shaft cylinder 2. A display unit that has a color mechanism of the thermochromic ink 63 accommodated in the writing core 6, the operating body 8 connected to the rear end of the writing core 6. The operating body 8 connected to the rear end of the friction core body 7 includes a display unit that exhibits a color other than the color of the display unit of the writing core body 6 housed in the shaft cylinder 2. It is a requirement that the display unit is configured to be visible from the outside.

The thermochromic writing instrument 1 of the third invention can easily identify the display part of the friction core 7 when using the friction core 7, and without mistakes with the writing core 6, The tip 71 of the friction core 7 can be projected outside from the front end hole 31 of the shaft cylinder 2.

According to a fourth invention of the present application, in the third invention, the thermochromic ink 63 accommodated in the writing core 6 exhibits a color other than transparent, white, gray, and light in a colored state. The operating body 8 connected to the rear end of the writing core 6 includes a display unit that displays the color of the colored state of the thermochromic ink 63 accommodated in the writing core 6, and the friction core It is a requirement that the operating body 8 connected to the rear end of 7 includes a display unit that exhibits any one of transparent, white, gray, and light colors.

The display part of the operation body 8 connected to the rear end of the writing core 6 exhibits a color other than transparent, white, gray, and light color (that is, transparent, white, gray, and non-light color), and the friction core. When the friction core body 7 is used by the display section of the operating body 8 connected to the rear end of the body 7 being transparent, white, gray, or light, the display section of the friction core body 7 is used. Thus, the tip 71 of the friction core 7 can be more reliably projected to the outside from the front end hole 31 of the shaft cylinder 2 without making a mistake with the writing core 6. In the present invention, the light color means a light color that cannot easily confirm the handwriting by the color visually. Examples of colors other than the transparent, white, gray, and light colors include black, blue, red, yellow, green, orange, purple, amber, pink, and light blue. Examples of the transparency include colorless and transparent, and colored and transparent with white, gray, or blackishness. The display portion of the friction core 7 is preferably white or gray (that is, an achromatic color excluding black).

According to a fifth invention of the present application, in the first, second, third, or fourth invention, the front end portion of the shaft cylinder 2 having the front end hole 31 is made of a transparent hard material, and the friction core body 7 is made of a soft material, and it is required that the tip 71 slides on the inner surface of the front end hole 31 when the tip 71 protrudes and retracts from the front end hole 31.

The thermochromic writing instrument 1 according to the fifth aspect of the present invention removes the thermochromic ink 63 attached to the inner surface of the front end hole 31 by sliding when the tip 71 moves in or out, or changes color from colored to colorless by frictional heat. The ink 63 can be erased (colorless), and the appearance of the front end portion of the shaft tube 2 is not impaired. The front end portion of the shaft tube 2 having the front end hole 31 made of the hard material is formed on the outer surface of the pen tip 61 or the writing core 6 in a state where the pen tip 61 protrudes outside from the front end hole 31 (that is, at the time of writing). The outer surface in the vicinity of the nib 61 is supported, and the outer surface of the tip 71 in a state where the tip 71 protrudes to the outside from the front end hole 31 (that is, at the time of friction discoloration) or the outer surface in the vicinity of the tip 71 of the friction core 7 is supported. In particular, the outer surface of the tip 71 made of a soft material is supported by the front end portion of the shaft cylinder 2 having the front end hole 31, and the wobbling of the tip 71 during frictional discoloration is effectively suppressed. As the hard material constituting the front end portion, for example, a synthetic resin such as polycarbonate, polypropylene, or polyethylene terephthalate is employed.

According to a sixth aspect of the present invention, at least one (that is, one or more) writing core body 6 is accommodated in the shaft tube 2 so as to be movable in the front-rear direction, and the writing core body 6 is heated. A pen tip 61 that accommodates the color changing ink 63 and is capable of discharging the thermochromic ink 63 is provided at the front end of the writing core 6, and the pen tip 61 of the writing core 6 is attached to the front end hole of the shaft cylinder 2. 31 is a writing core refill for use in a thermochromic writing instrument 1 provided with a retracting mechanism that allows it to appear and retract from 31, and includes a nib 61, the nib 61 at the front end, and a thermochromic ink 63 accommodated therein. The ink storage tube 62 is connected to the rear end of the ink storage tube 62, protrudes from the side wall of the shaft tube 2 when used, and slides forward to allow the pen tip 61 to pass from the front end hole 31 of the shaft tube 2. And an operating body 8 that protrudes, and the operating body 8 has the thermochromic property. Appear the color of the colored state of Nki 63 may be a requirement that a display unit visible from outside.

The writing core body refill according to the sixth aspect of the present invention is the other writing core body (or other writing core body before being accommodated in the shaft tube 2 by visually recognizing the display portion of the operation body 8 from the outside. It becomes easy to distinguish from (Refill). Note that the color of the display section of the operation section 8 of the writing core refill (that is, the color in the coloring state of the thermochromic ink) is, for example, black, blue, red, yellow, green, orange, purple, amber, pink , Light blue and the like.

In the seventh invention of the present application, at least one (ie, one or more) writing core body 6 and at least one (ie, one or more) friction core body 7 are provided in the shaft cylinder 2. A pen tip 61 that accommodates the thermochromic ink 63 in the writing core 6 and accommodates the thermochromic ink 63 at the front end of the writing core 6 is accommodated so as to be movable in the front-rear direction. A tip 71 is provided on the front end of the friction core 7 to rub the handwriting of the thermochromic ink 63 and to thermally change the handwriting by frictional heat generated at that time. A friction core refill for use in the thermochromic writing instrument 1 provided with a projecting / retracting mechanism that allows the tip 61 and the tip 71 of the friction core 7 to selectively project and retract from the front end hole 31 of the shaft cylinder 2, Chip 71 made of a soft material and shaft portion made of a hard material provided with tip 71 at the front end 2 and an operating body 8 that is connected to the rear end of the shaft portion 72, protrudes from the side wall of the shaft tube 2 when used, and slides forward to project the tip 71 from the front end hole 31 of the shaft tube 2. It is a requirement that the operating body 8 includes a display unit that is transparent, white, gray, or light and visible from the outside.

The friction core body refill according to the seventh aspect of the present invention includes a writing core body 6 (or writing core body refill) before being accommodated in the shaft cylinder 2 by visually recognizing the display portion of the operation body 8 from the outside. Can be easily identified.

Chip In the present invention, the soft material constituting the chip 71 includes an elastic resin (rubber, elastomer), for example, a silicone resin, an SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like can be mentioned. The soft material composing the tip 71 is more effective in that no wear debris is produced from a low-wear elastic material than from a high-wear elastic material (such as an eraser).

-Thermochromic ink In the present invention, the thermochromic ink 63 is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that is decolored by heating from a colored state, a color memory retaining type that reversibly stores 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 reversible thermochromic microcapsule pigment contained in the reversible thermochromic ink is conventionally known (a) electron donating color-forming organic compound, (b) electron accepting compound, and (c) the above It is effective to encapsulate a reversible thermochromic composition containing at least the essential three components of a reaction medium that determines the temperature at which the two color reactions occur in a microcapsule.

As shown in FIG. 8, the reversible thermochromic composition applied to the thermochromic ink 63 of the present invention has a curved shape in which the change in color density due to a temperature change is plotted, and the temperature is lower than the color change temperature range. Contrary to the case where the temperature is raised from the color change temperature range, the color change is performed by following a different path between the case where the color change temperature range is lowered from the higher temperature side, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) is decolored state in the color temperature (t ₄₎ above the hot zone, the specific temperature range [t ₂ ~t temperature range between ₃ (substantially two-phase retaining temperature region)] color memory retention type heat that can be stored and held in It is preferred that a color changing composition is applied. In FIG. 8, ΔH represents a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

The substantial two-phase holding temperature range can be set according to the purpose, but in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is 25 ° C. to 95 ° C. (preferably 36 ° C. ˜90 ° C.), and the low temperature side discoloration point [complete color development temperature (t ₁ )] may be set in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). It is valid. Thereby, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and the handwriting by the reversible thermochromic ink can be easily discolored by the frictional heat generated by the tip 71.

The reversible thermochromic microcapsule pigment preferably has an average particle diameter in the range of 0.5 to 5.0 μm, preferably 1 to 4 μm. When the average particle diameter exceeds 5.0 μm, the flowability from the capillary gap of the ball-point pen tip 71 and the marking pen chip 71 decreases, and when the average particle diameter is less than 0.5 μm, it is difficult to exhibit high-density color development. Become.

The reversible thermochromic microcapsule pigment can be blended in an amount of 2 to 50% by weight (preferably 3 to 40% by weight, more preferably 4 to 30% by weight) based on the total amount of the ink composition. If it is less than 2% by weight, the color density is insufficient, and if it exceeds 50% by weight, the ink outflow is reduced and the writing property is impaired.

As the thermochromic ink 63, an ink that changes from colored to colorless by frictional heat is effective. Thereby, the colored handwriting made of the thermochromic ink 63 can be colorless by the frictional heat caused by the friction of the tip 71 of the friction core 7, and the handwriting can be rewritten on the colorless writing surface. A colored handwriting made of the thermochromic ink 63 can be formed. This gives the user the sensation of erasing the handwriting made of a pencil lead with an eraser and then writing again on the writing surface. Specifically, as the thermochromic ink 63, a reversible thermochromic ink that changes from a colored state to a colorless state by heating and changes from a colorless state to a colored state by cooling is effective. The thermochromic ink 63 of the present invention is changed from a color due to frictional heat to a color different from the color by blending a non-thermochromic colorant (dye, pigment, etc.) in the microcapsule or ink. Changing inks can also be employed.

Even if only one hand can be used, the present invention can be quickly put into a writable state and a storage state, and after writing, the shaft tube can be quickly held without changing the shaft tube greatly while holding the shaft tube in one hand. It is possible to provide a thermochromic writing instrument incorporating a thermochromic ink that can be shifted to frictional discoloration work.

The present invention can provide a writing core refill that can be easily distinguished from other writing cores (or other writing core refills) before being accommodated in the shaft cylinder.

The present invention can provide a friction core body refill that can be easily distinguished from a writing core body (or writing core body refill) before being housed in the shaft cylinder.

It is a longitudinal cross-sectional view which shows the state (storage state) in which both the nib and the chip | tip of embodiment of the thermochromic writing instrument of this invention were immersed. It is a longitudinal cross-sectional view which shows the state (at the time of writing) where the pen tip of the thermochromic writing instrument of FIG. 1 protruded. It is a longitudinal cross-sectional view which shows the state (at the time of friction discoloration) which the chip | tip of the thermochromic writing instrument of FIG. 1 protruded. It is a side view which shows the state which closed the opening part of the rear end of the thermochromic writing instrument of FIG. It is a side view which shows the state which open | released the opening part of the rear end of the thermochromic writing instrument of FIG. It is a longitudinal cross-sectional view which shows the state (namely, writing core refill) which the operation body connected with the rear end of the writing core of FIG. FIG. 2 is a longitudinal sectional view showing a state in which an operating body is connected to a rear end of the friction core body of FIG. 1 (that is, a friction core body refill). It is explanatory drawing which shows the discoloration behavior of a reversible thermochromic composition.

1 to 7 show an embodiment of the present invention.
The thermochromic writing instrument 1 of the present embodiment is accommodated in a shaft cylinder 2 such that one writing core 6 and one friction core 7 are movable in the front-rear direction (axial direction). ing. Each of the writing core 6 and the friction core 7 is urged rearward by an elastic body 21 (specifically, a compression coil spring).

The shaft cylinder 2 includes a front shaft 3 made of a tapered cylindrical body, and a cylindrical rear shaft 4 attached to the rear end portion of the front shaft 3 by screwing or press-fitting. A front end hole 31 through which the pen tip 61 of the writing core 6 and the tip 71 of the friction core 7 can protrude is provided in the front end of the front shaft 3 in the axial direction. The front shaft 3 and the rear shaft 4 are obtained by injection molding of a transparent synthetic resin (for example, polycarbonate or the like). The shaft cylinder 2 (front shaft 3 and rear shaft 4) may be formed of metal.

A plurality of (two in this case) elongated windows extending in the front-rear direction according to the number of writing cores 6 and friction cores 7 housed in the shaft cylinder 2 are provided on the rear side wall of the rear shaft 4. A hole 41 is provided in the radial direction. An opening 42 is formed at the rear end portion of the rear shaft 4 so as to penetrate in the axial direction and open radially outward. The opening 42 communicates with the window hole 41 at the rear end of the rear shaft 4 (that is, the rear end of the shaft cylinder 2), whereby the rear end of the window hole 41 is notched rearward and opened rearward. On the other hand, the front end of the window hole 41 is always closed.

Further, a locking wall portion 43 made of a rib extending in the front-rear direction is formed on the inner surface of the side wall between the window holes 41 of the rear shaft 4, and a pen point 61 or a tip 71 is formed on the locking wall portion 43. When projecting, the rear end of the operating body 8 corresponding to the projecting pen tip 61 or tip 71 is locked.

A clip 44 is provided on the outer surface of the side wall between the window holes 41 of the rear shaft 4.

In a state where the pen tip 61 protrudes to the outside from the front end of the shaft cylinder 2 (at the time of writing), the inner surface of the front end hole 31 supports the outer surface in the radial direction of the pen tip 61 and the tip 71 protrudes to the outside from the front end of the shaft cylinder 2. In the state (at the time of friction discoloration), the inner surface of the front end hole 31 supports the outer surface in the radial direction of the tip 71. Since the front end portion of the shaft cylinder 2 including the front end hole 31 is formed integrally with the shaft cylinder 2 (front shaft 3), it is made of the same hard material as the shaft cylinder 2 (for example, polycarbonate resin).

-Lid part At the rear-end part of the said rear axis | shaft 4, the cover part 5 which makes the said opening part 42 openable and closable is provided rotatably. One end of the lid 5 is attached to the base of the clip 44 by a hinge 52 so as to be rotatable. A contact wall 51 is formed on the front surface of the lid 5. An operation connected to the abutting wall 51 is connected to the rear end of the operating body 8 connected to the rear end of the writing core 6 in the pen tip immersion state and to the rear end of the friction core 7 in the tip immersed state. The rear end of the body 8 is brought into contact.

On the front surface of the other end portion of the lid portion 5, an engaging portion 53 including a concave portion or a hole portion is provided. At the rear end of the shaft cylinder 2 (rear shaft 4), an engaged portion 45 made of a convex portion engageable with the engaging portion 53 is provided. An inward projection is formed on the inner surface of the engaging portion 53, while an outward projection that can get over and engage with the inward projection is formed on the outer surface of the engaged portion 45.

The engaging portion 53 and the engaged portion 45 are in an engaged state with each other when the lid portion 5 closes the opening 42 (specifically, the inward projection and the outward projection are overcoming and locked) ) In the contact between the operating body 8 and the contact wall portion 51 on the front surface of the lid portion 5 by the rearward urging of the projectile body 21, the engaged state is not released and the lid portion 5 is not opened. .

Writing core The writing core 6 is a ballpoint pen refill, and includes a ballpoint pen tip (that is, a pen tip 61) in which a ball is rotatably held at the front end, the ballpoint pen tip at the front end, and a rear end. The ink storage tube 62 is opened. Inside the ink storage tube 62, a thermochromic ink 63 made of an aqueous gel having shear thinning viscosity is stored. The rear end of the thermochromic ink 63 in the ink containing tube 62 is filled with a follower 64 made of a high-viscosity fluid that advances as the ink is consumed.

The nib 61 is composed of a ballpoint pen tip including a ball rotatably held at the front end. Inside the nib 61 is accommodated a ball bullet 65 for pushing the front end ball forward. The ball elastic body 65 has a configuration in which a rod portion is provided at the front end portion of the compression coil spring, and the front end of the rod portion is in contact with the rear surface of the ball. When not writing, the ball is pressed close to the inner surface of the front end edge of the front end of the ballpoint pen tip by the forward urging of the ball projecting element 65, thereby preventing ink leakage and ink evaporation from the front end of the pen tip 61. . The ballpoint pen tip may be directly attached to the front end opening of the ink containing tube 62 by press fitting or the like, but in this embodiment, it is fixed to the front end opening of the ink containing tube 62 via the pen tip holder.

The thermochromic ink 63 has a low temperature side color change point (complete color development temperature t ₁ ) set to an arbitrary temperature in the range of −30 ° C. to −10 ° C., and a high temperature side color change point (complete color erasing temperature t ₄ ). An ink having a reversible thermochromic composition that is set to an arbitrary temperature in the range of 60 ° C. to 80 ° C. and has a hysteresis width ΔH in the range of 40 ° C. to 60 ° C. is employed. The thermochromic ink 63 exhibits a color other than transparent, white, gray, and light in a colored state. In the colored state, the thermochromic ink 63 exhibits, for example, black, blue, red, yellow, green, orange, purple, amber, pink, light blue, and the like. The thermochromic ink 63 becomes colorless in the decolored state.

Friction core body The friction core body 7 includes a tip 71 and a shaft portion 72 to which the tip 71 is attached at the front end. The shaft portion 72 employs the same cylindrical member as the ink containing tube 62 of the writing core 6. The chip 71 is made of a soft material (for example, SBS resin, SEBS resin). The shaft 72 is made of a hard material (for example, a synthetic resin such as polypropylene resin or polyethylene resin, or a metal such as stainless steel). The chip 71 is directly attached to the shaft part 72 or is attached to the shaft part 72 via another member such as a chip holder. Further, in order to adjust the protruding amount of the tip 71 from the shaft portion 72, a feeding mechanism can be provided in the shaft portion 72.

Chip The chip 71 includes a substantially cylindrical front part, an intermediate part having an outer diameter larger than the inner diameter of the shaft part 72, and a substantially cylindrical rear part. The rear portion is press-fitted into the front end opening of the shaft portion 72. The intermediate portion is brought into contact with the front end of the shaft portion 72. The front end of the tip 71 has a spherical round shape. This enables smooth contact between the front end of the tip 71 and the writing surface during friction discoloration, and facilitates generation of frictional heat by obtaining an appropriate contact area between the front end of the tip 71 and the writing surface. Become. In addition to this, the front end of the tip 71 may be a chisel shape, a shell shape, a cylindrical shape, a conical shape, a prism shape, a pyramid shape, or the like. The tip 71 slides with the inner surface of the front end hole 31 when the tip is retracted.

-Operating body Each of the rear end of the writing core 6 (that is, the rear end opening of the ink containing tube 62) and the rear end of the friction core 7 (that is, the rear end opening of the shaft portion 72) An operating body 8 is attached. Each of the operation bodies 8 includes an operation portion 81 formed at the rear end portion and projecting outside from the window hole 41 of the shaft cylinder 2, a rear side projection portion 83 provided on the opposite side of the operation portion 81, A front projecting portion 82 provided in front of the rear projecting portion 83 on the opposite side of the operating portion 81; a fitting portion 84 formed at the front end portion and fitted into the rear end opening of the ink containing tube 62; and the fitting portion. 84, and a flange 85 formed at the rear of 84. The insertion portion 84 does not completely block the rear end opening of the ink storage tube 62 when inserted into the rear end opening of the ink storage tube 62, and can vent the inside and the outside of the ink storage tube 62. To. In addition, the rear end of the bullet 21 is locked to the front surface of the flange portion 85. A writing core refill is configured by connecting the operating body 8 to the rear end of the writing core 6 (see FIG. 6). A friction core body refill is formed by connecting an operating body 8 to the rear end of the friction core body 7 (see FIG. 7).

When the pen point 61 of the writing core 6 is in an immersive state (see FIGS. 1 and 3), the rear end portion of the operating body 8 attached to the writing core 6 is formed on the front surface of the lid 5. It abuts against the abutting wall 51. On the other hand, when the pen point 61 of the writing core 6 is in a protruding state (see FIG. 2), the rear end portion of the operation body 8 attached to the writing core 6 is formed on the inner wall of the shaft cylinder 2. Locked to the locking wall 43.

Similarly, when the tip 71 of the friction core 7 is in an immersive state (see FIGS. 1 and 2), the rear end portion of the operation body 8 attached to the friction core 7 is on the front surface of the lid 5. It abuts on the abutting wall 51 formed. On the other hand, when the tip 71 of the friction core 7 is in a protruding state (see FIG. 3), the rear end portion of the operation body 8 attached to the friction core 7 is formed on the inner wall of the shaft tube 2. Locked to the stop wall 43.

As shown in FIG. 2, when the front projecting portion 82 of the operating body 8 connected to the rear end of the friction core 7 in the tip immersion state slides the operating portion 81 of the operating body 8 forward, The pen tip projecting state of the writing core 6 is released by contacting the rear projecting portion 83 of the operating body 8 connected to the rear end of the writing core 6 in the pen tip projecting state. Further, as shown in FIG. 3, the front protrusion 82 of the operating body 8 connected to the rear end of the writing core 6 in the pen nib immersing state slides the operating section 81 of the operating body 8 forward. At this time, it comes into contact with the rear protrusion 83 of the operating body 8 connected to the rear end of the friction core 7 in the tip protruding state, and the tip protruding state of the friction core 7 is released.

Display unit The operating body 8 attached to the rear end of the writing core 6 is the color development state of the thermochromic ink 63 accommodated inside the writing core 6 to be connected (that is, inside the ink containing tube 62). It is colored in almost the same color. Specifically, each of the operation bodies 8 is made of a synthetic resin molded body colored in substantially the same color as the colored ink color of the thermochromic ink 63 of the linked writing core 6. Thereby, the operation body 8 has a display unit for displaying the ink color of the colored state of the thermochromic ink 63 accommodated in the writing core body 6.

The operation body 8 attached to the rear end of the friction core body 7 is transparent, white, gray, or light color. Specifically, each of the operation bodies 8 is made of a transparent synthetic resin or a molded body of a synthetic resin exhibiting white, gray, or light color. Thereby, the operation body 8 has a display unit that exhibits a color other than the ink color of the colored state of the thermochromic ink 63.

A projectile support part 9 having a cylindrical shape is provided on the inner wall of the barrel 2 (that is, the inner wall of the rear shaft 4). A plurality of inner holes 91 through which the writing core body 6 and the friction core body 7 are inserted are penetrated in the elastic body support portion 9 in the axial direction. Each projectile 21 is disposed between the rear surface of the projectile support 9 and the front surface of the flange 85 of each operation body 8. The writing core 6 is loosely inserted into each of the bullets 21 and the front end of each bullet 21 is locked by the rear surface of the bullet support 9, The rear end is locked to the front surface of the collar portion 85 of the operation body 8.

Further, around each inner hole 91 on the rear surface of the projectile support 9, a holding portion 92 made of a cylindrical protruding portion protruding rearward is formed. The inner surface of each holding portion 92 is press-fitted and held at the outer surface of the front end portion of each elastic body 21. Thereby, when the writing core 6 and the friction core 7 are exchanged, it is possible to prevent the respective elastic bodies 21 from dropping out of the shaft cylinder 2 through the opening 42.

Each of the projectile bodies 21 always urges each operation body 8 (that is, each writing core body 6) backward. Each of the elastic bodies 21 is in a compressed state (that is, the writing core 6 and the friction core 7 are urged rearward in any of the pen tip protruding state, the pen tip immersing state, the tip protruding state, and the tip immersing state. In this state, the back and forth of each operation body 8 is prevented from shaking.

When the operating portion 81 of the operating body 8 of the pen core projecting writing writing core 6 is slid forward along the window hole 41 against the rearward bias of the elastic body 21, the operating body that has been slid 8, the front projecting portion 82 lifts the rear projecting portion 83 of the operating body 8 of the friction core 7 in the tip projecting state in the radially outward direction. As a result, the locking state between the locking wall portion 43 of the inner wall of the shaft cylinder 2 and the operation body 8 that is in the tip protruding state is released, and the friction core body 7 is moved backward by the rear urging of the elastic body 21. The tip 71 of the friction core 7 is moved into the shaft cylinder 2, and the rear end of the operating body 8 of the friction core 7 is brought into contact with the contact wall 51 on the front surface of the lid 5. . Simultaneously with the immersion of the tip 71 of the friction core 7, the pen point 61 of the writing core 6 connected to the operating body 8 slid forward is projected outside from the front end hole 31 of the shaft cylinder 2. At the same time, the rear end of the operating body 8 that has been slid forward is locked to the locking wall portion 43 of the inner wall of the shaft tube 2, and the pen tip protruding state is maintained.

In the present embodiment, when writing, the thermochromic writing instrument 1 is held in one hand and the operation unit 81 is pressed forward to quickly move the pen from the pen tip immersive state (the state shown in FIGS. 1 and 3). It can be set in the first protruding state (the state shown in FIG. 2). By writing on the writing surface such as paper with the pen tip 61 in the protruding state, the handwriting by the thermochromic ink 63 can be formed on the writing surface.

When the operation portion 81 of the operation body 8 of the chip retracting friction core 7 is slid forward along the window hole 41 against the rearward bias of the elastic body 21, the operation body 8 that has been slid is operated. The front projecting portion 82 lifts the rear projecting portion 83 of the operating body 8 of the writing core 6 in the pen tip projecting state radially outward. As a result, the locking state between the locking wall 43 of the inner wall of the shaft tube 2 and the operating body 8 of the writing core 6 in the pen tip protruding state is released, and the writing core 6 is released from the elastic body 21. The pen tip 61 of the writing core 6 is immersed in the shaft tube 2 and the rear end of the operating body 8 of the writing core 6 is brought into contact with the front surface of the lid 5. It abuts against the wall 51. Simultaneously with the immersion of the pen tip 61 of the writing core 6, the tip 71 of the friction core 7 connected to the operating body 8 slid forward is protruded to the outside from the front end hole 31 of the shaft cylinder 2. At the same time, the rear end of the operating body 8 that has been slid forward is locked to the locking wall portion 43 of the inner wall of the shaft tube 2, and the tip protruding state is maintained.

In the present embodiment, when the handwriting is subjected to frictional discoloration after writing, the operation unit 81 is pushed forward without greatly changing the thermochromic writing instrument 1 while holding the thermochromic writing instrument 1 in one hand. By doing so, it is possible to quickly change from the chip immersion state (the state shown in FIGS. 1 and 2) to the chip protruding state (the state shown in FIG. 3). With the tip 71 in the protruding state, the handwriting by the thermochromic ink 63 formed on the writing surface can be rubbed, and the handwriting can be thermally discolored (here, colorless) by the frictional heat generated at that time. .

-Replacement of writing core, replacement of friction core Replacement of the writing core 6, the friction core 7, and the operation body 8 corresponding thereto in the present embodiment will be described. When the writing core 6 or the friction core 7 is replaced, the lid 5 is opposite to the hinge 52 of the lid 5 from the state in which the lid 5 closes the opening 42 at the rear end of the shaft cylinder 2 (see FIG. 4). The operation end on the side is pressed rearward, the engagement between the engaging portion 53 and the engaged portion 45 is released, the lid portion 5 is rotated rearward, and the opening 42 at the rear end of the shaft tube 2 is opened. Open. When the opening 42 is opened, each operation body 8 is protruded from the opening 42 to the rear outside by the rear urging of the projectile 21. In the state in which the opening 42 at the rear end of the shaft cylinder 2 is opened (see FIG. 5), the writing body 6 (that is, the writing core) is connected to the operating body 8 by taking out the operating body 8. Body refill) or friction core body 7 (that is, friction core body refill) is taken out of the shaft cylinder 2 through the opening 42, and then a new writing core body 6 in a connected state and the corresponding core body 6 A new operating body 8 or a new friction core body 7 connected to each other and a new operating body 8 corresponding thereto are inserted into the shaft tube 2 through the opening 42. Then, the rear end of each operation body 8 is brought into contact with the abutting wall portion 51 of the lid 5, the lid 5 is rotated forward while pressing each operation body 8 forward, and then the engagement is performed. The opening 53 is closed by engaging the portion 53 and the locked portion. Thereby, the replacement work of the writing core 6, the friction core 7, and the operation body 8 corresponding thereto is completed.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Bullet 3 Front shaft 31 Front end hole 4 Rear shaft 41 Window hole 42 Opening part 43 Locking wall part 44 Clip 45 Engagement part 5 Lid part 51 Contact wall part 52 Hinge part 53 Engagement part 6 Writing core 61 Pen point (ballpoint pen tip)
62 Ink receiving tube 63 Thermochromic ink 64 Follower 65 Ball resilient body 7 Friction core 71 Tip 72 Shaft 8 Operating body 81 Operating part 82 Front protruding part 83 Rear protruding part 84 Insertion part 85 Eave part 9 Projectile support part 91 Inner hole 92 Holding part

Claims (6)

A thermochromic writing instrument incorporating a thermochromic ink, wherein at least one writing core and at least one friction core are accommodated in a shaft cylinder so as to be movable in the front-rear direction. A thermochromic ink that exhibits a color other than transparent, white, gray, and light color in the colored state inside the core, and that thermally changes color from the colored state by heating, is stored in the front end of the writing core. A pen tip capable of discharging the color-changing ink is provided, and a tip capable of thermally changing the handwriting by frictional heat generated by rubbing the handwriting of the thermochromic ink at the front end of the friction core, The pen tip of the writing core and the tip of the friction core are provided with a projecting mechanism that allows the tip of the shaft cylinder to be selectively projected and retracted, and the tip of the friction core is made of a soft material, The front end of the shaft cylinder when rubbing the handwriting of thermochromic ink Thermochromic writing instrument characterized by supporting the outer surface of the chip by. The writing core includes a nib and an ink containing tube including the nib at a front end and containing a thermochromic ink therein, and the nib is held at the front end so that a ball can rotate. A ballpoint pen tip that is urged forward by a ball projectile and is in close contact with the inner surface of the inward front edge, and the friction core is made of a soft material, and the tip The thermochromic writing instrument according to claim 1, comprising: a shaft portion made of a hard material provided at the front end. An elastic body that biases the writing core backward and an elastic body that biases the friction core backward are accommodated in a shaft cylinder, and an operating body is provided at the rear end of the writing core. An operating body is connected to the rear end of the friction core, a plurality of window holes extending in the front-rear direction are provided in a radial direction on the side wall of the shaft cylinder, and radially outward from the respective window holes. Each of the operating bodies protrudes in the direction, and one operating body is slid forward along the window hole, so that the pen tip of the writing core corresponding to the one operating body or the tip of the friction core And a projecting / retracting mechanism in which the pen tip of the writing core or the tip of the friction core that had been in the protruding state is inserted into the shaft cylinder. The operation body connected to the rear end of the core for printing exhibits the color of the colored state of the thermochromic ink accommodated in the writing core. An operating body connected to the rear end of the friction core includes a display unit that exhibits a color other than the color of the display unit of the writing core housed in the shaft cylinder, The thermochromic writing instrument according to claim 1 or 2, wherein the portion is configured to be visible from the outside. The thermochromic ink accommodated in the writing core exhibits a color other than transparent, white, gray, and light color in a colored state, and an operating body connected to the rear end of the writing core is used for the writing The operation unit connected to the rear end of the friction core is transparent, white, gray, or light in color, provided with a display unit that displays the color of the thermochromic ink contained in the core. The thermochromic writing instrument according to claim 3, further comprising a display unit. The front end portion of the shaft cylinder having the front end hole is made of a transparent hard material, the tip of the friction core is made of a soft material, and the tip slides on the inner surface of the front end hole when the tip protrudes from the front end hole. The thermochromic writing instrument according to any one of claims 1 to 4. The tip of the friction core includes a substantially cylindrical front part, an intermediate part having an outer diameter larger than the inner diameter of the shaft part, and a substantially cylindrical rear part, and the intermediate part contacts the front end of the shaft part. The rear portion is press-fitted into a front end opening of the shaft portion and supports the outer surface of the front portion of the tip from the front end portion of the shaft tube when rubbing the handwriting of the thermochromic ink. The thermochromic writing instrument according to any one of 5.

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