JP6774331B2 - Thermal discoloration writing instrument - Google Patents

Description

The present invention relates to a thermochromic writing instrument.

Conventionally, for example, in Patent Document 1, a thermochromic ink is housed inside a cursive, a pen tip capable of ejecting the thermochromic ink is provided at the front end of the cursive, and the cursive is placed in a shaft cylinder. A knock body is provided at the rear end of the barrel, and the knock body is pressed forward to make the pen tip protrude from the front end hole of the barrel, and the knock body is knocked again. The pen tip is released from the protruding state by pressing the body forward, and the pen tip is provided with a retracting mechanism that allows the pen tip to be immersed in the shaft cylinder through the front end hole of the shaft cylinder. The heat is applied to the outer surface of the rear end portion of the knock body. A friction body capable of thermally discoloring the cursive of the heat-discoloring ink by rubbing the cursive of the discoloration ink and the frictional heat generated at that time is provided, and an engaging portion is provided on the friction body and the engaging portion of the friction body An engageable portion is provided so that the engaged portion and the engaged portion are engaged during a friction operation using the friction body to prevent the friction body from moving in the front-rear direction with respect to the barrel. A thermochromic cursive writing tool is disclosed.

Further, in Patent Document 1, in a pen tip protruding state, the engaging portion of the friction body and the engaging portion of the shaft cylinder (groove extending in the circumferential direction of the L-shaped groove) are engaged with each other with respect to the shaft cylinder. A configuration is disclosed that prevents the friction body from moving in the front-rear direction.

Japanese Unexamined Patent Publication No. 2011-37087

The thermochromic writing instrument of Patent Document 1 prevents the friction body from moving in the front-rear direction in the pen tip protruding state, and does not consider preventing the friction body from moving in the front-rear direction in the pen tip immersion state. .. Therefore, it is difficult to perform a stable friction operation using the friction body in the pen tip immersion state, and there is a possibility that the knock body is inadvertently pressed when not in use to cause the pen tip to be in the protruding state by mistake.

The present invention solves the above-mentioned conventional problems, and can perform stable friction operation using a friction body in either a pen tip immersion state or a pen tip protrusion state, and is not used. It is an object of the present invention to provide a thermochromic writing instrument that can avoid inadvertently pressing a knock member and accidentally causing the pen tip to protrude.

In the present invention, "front" refers to the pen body side, and "rear" refers to the opposite side. In the present invention, the "pen tip immersion state" means a state in which the pen tip is immersed in the barrel, and the "pen tip protrusion state" means a state in which the pen tip protrudes outward from the front end of the barrel. To say.

The thermochromic writing tool 1 according to the first invention of the present application accommodates the thermochromic ink inside the cursive 3, and provides a pen tip 31 capable of ejecting the thermochromic ink at the front end of the cursive 3. The cursive 3 is housed in the barrel 2 so as to be movable in the front-rear direction, the knock member 6 is projected rearward from the rear end hole 22 of the barrel 2, and the knock member 6 is pressed forward. The pen tip 31 is brought into a protruding state from the front end hole 21 of the barrel 2, and the knock member 6 is pressed forward again to release the pen tip protruding state, and the pen tip 31 is shafted from the front end hole 21 of the barrel 2. A hoisting mechanism for immersing the ink in the cylinder 2 is provided, and the cursive of the heat-discoloring ink is rubbed against the outer surface of the rear end of the knock member 6, and the frictional heat generated at that time heats the brush of the heat-discoloring ink. A heat-discolorable writing tool provided with a discolorable friction portion 8.
A plurality of cam teeth 24 and cam grooves 25 formed on the inner surface of the shaft cylinder 2 and alternately arranged along the circumferential direction extending in the front-rear direction, and the shaft cylinder behind the writing body 3 A rotating member 4 having a plurality of ridges 41 rotatably arranged with respect to the cam tooth 24 or alternately engaging with the cam tooth 24 or the cam groove 25, and a shaft cylinder 2 behind the rotating member 4. A plurality of cam protrusions 51 that are non-rotatable and movable in the front-rear direction, have a plurality of cam protrusions 51 for rotating the rotating member 4, and are movably engaged with a cam groove 25 on the inner surface of the barrel 2. A cam member 5 having an engaging projection 52, a knock member 6 for pressing the cam member 5 forward, and a projectile 7 for urging the writing body 3 rearward.
The cross-sectional shape of the inner surface of the opening of the rear end hole 22 of the axle cylinder 2 is a non-circular shape, and the shape is non-circular.
A regulation wall portion 61 that can be inserted into the rear end hole 22 is formed on the side wall of the knock member 6, and the cross-sectional shape of the outer surface of the regulation wall portion 61 corresponds to the shape of the inner surface of the rear end hole 22. Non-circular
When the regulation wall portion 61 of the knock member 6 is inside the rear end hole 22, the knock member 6 can be pressed forward.
When the regulation wall portion 61 of the knock member 6 is positioned behind the opening of the rear end hole 22, the knock member 6 becomes rotatable with respect to the axle cylinder 2.
When the knock member 6 is rotated with respect to the axle cylinder 2 and the front end of the regulation wall portion 61 of the knock member 6 is in contact with the opening edge portion of the rear end hole 22 of the axle cylinder 2. It is a requirement that the forward movement of the knock member 6 is prevented.

The thermochromic writing instrument 1 according to the first invention of the present application can perform a stable friction operation using a friction body regardless of whether the pen tip is immersed or the pen tip is projected due to the above configuration. It is possible to avoid inadvertently pressing the knock member 6 when not in use to accidentally bring the pen tip 31 into a protruding state.

In the thermochromic writing instrument 1 according to the second invention of the present application, the knock member 6 is urged forward with respect to the barrel 2 in the thermochromic writing instrument 1 according to the first invention of the present application. It is a requirement that the regulation wall portion 61 of the knock member 6 is arranged in the rear end hole 22 so as to be movable in the front-rear direction.

In the thermochromic writing instrument 1 according to the second invention of the present application, the regulation wall portion 61 is always arranged in the rear end hole 22 during normal writing use (non-friction operation) due to the above configuration. Except when the friction portion 8 is used for friction operation, the front end of the regulation wall portion 61 is carelessly positioned behind the opening edge of the rear end hole 22, and the front end and rear of the regulation wall portion 61 of the knock member 6 are inadvertently positioned. It is possible to avoid contact with the opening edge of the end hole 22.

The thermochromic writing instrument of the present invention can perform stable friction operation using a friction body regardless of whether the pen tip is immersed or protruding, and inadvertently presses the knock member when not in use. This can prevent the pen tip from being accidentally projected.

It is a vertical cross-sectional view which shows the pen tip immersion state at the time of the non-friction operation of the embodiment of this invention. It is an enlarged vertical sectional view of the main part of FIG. It is a vertical cross-sectional view which shows the pen tip immersion state at the time of the friction operation of FIG. FIG. 3 is an enlarged vertical sectional view of a main part of FIG. It is a vertical cross-sectional view which shows the pen tip protruding state at the time of a non-friction operation of FIG. FIG. 5 is an enlarged vertical sectional view of a main part of FIG. It is a vertical cross-sectional view which shows the pen tip protruding state at the time of the friction operation of FIG. FIG. 7 is an enlarged vertical sectional view of a main part of FIG. (A) is a perspective view of a main part showing a state in which the knock member 6 of FIG. 1 can move in the front-rear direction, and (b) shows a state in which the knock member 6 of FIG. 1 is prevented from moving in the front-rear direction. It is the main part perspective view which shows. It is an exploded view which shows the appearance mechanism of FIG.

An embodiment of the thermochromic writing instrument 1 of the present invention will be described with reference to the drawings. (See FIGS. 1 to 10)

In the thermochromic writing instrument 1 of the present embodiment, the shaft cylinder 2, the writing body 3 housed in the shaft cylinder 2, and the pen tip 31 of the writing body 3 can freely appear and disappear from the front end hole 21 of the shaft cylinder 2. It is equipped with a haunting mechanism. The axle tube 2 includes a cylindrical front shaft 2a, a cylindrical intermediate shaft 2b connected to the rear end of the front shaft 2a, and a cylindrical rear shaft 2c connected to the rear end of the intermediate shaft 2b. It consists of.

The front shaft front shaft 2a is a tapered cylindrical synthetic resin molded body. A front end hole 2131 is formed in the front end of the front shaft 2a in the front-rear direction. A grip portion made of an elastic material is formed on the side surface of the front shaft 2a. A male screw portion is integrally formed on the outer surface of the rear end opening of the front shaft 2a.

Intermediate shaft The intermediate shaft 2b is a cylindrical synthetic resin molded body. A cam portion is integrally formed on the inner surface of the intermediate shaft 2b. A step portion 23 is formed on the inner surface of the rear end opening of the intermediate shaft 2b.

Rear shaft The rear shaft 2c is a cylindrical synthetic resin molded body. A rear end hole 22 is formed in the rear end of the rear shaft 2c in the front-rear direction. On the outer surface of the side wall of the rear shaft 2c, a clip extending in the front-rear direction that can hold the outer surface of the axle cylinder 2 and a pocket or the like is provided. The clip is integrally formed on the outer surface of the side wall of the rear shaft 4, or is provided by attaching a separate member.

The cross-sectional shape of the inner surface of the rear end hole 22 of the rear shaft 2c has a regular hexagonal shape. The cross-sectional shape of the inner surface of the rear end hole 22 may be any shape as long as it is non-circular, and may be an elliptical shape as well as a regular polygon such as an equilateral triangle or a regular quadrangle. ..

-Cursive The cursive 3 includes a pen tip 31, an ink storage tube 32 in which the pen tip 31 is press-fitted and fixed to the front end opening, a heat-discolorable ink filled in the ink storage tube 32, and the heat-discoloration. It is composed of a follower (for example, a high-viscosity fluid) that is filled in the rear end of the sex ink and advances with the consumption of the heat-discoloring ink.

The pen tip 31 may be composed of, for example, only a metal ballpoint pen having a ball rotatably held at the front end, or a synthetic resin pen tip holder holding the rear outer surface of the ballpoint pen tip. There may be. Further, a tail plug having a ventilation hole through which the ink storage tube 32 and the outside can be ventilated may be attached to the rear end opening of the ink storage tube 32.

The infestation mechanism The infestation mechanism (see FIG. 10) is a knock-type infestation mechanism using a rotary cam mechanism, which is formed on the inner surface of the barrel 2 and is arranged alternately along the circumferential direction and extends in the front-rear direction. The cam teeth 24 and the cam groove 25 of the above are in contact with the rear end of the writing body 3 and are rotatably arranged with respect to the barrel 2, and can be alternately engaged with the cam teeth 24 or the cam groove 25. A plurality of rotating members 4 having a plurality of ridges 41, and a plurality of rotating members 4 arranged behind the rotating member 4 so as to be non-rotatable and movable in the front-rear direction with respect to the barrel 2. A cam member 5 having a cam protrusion 51 and having a plurality of engagement protrusions 52 movably engaged with the cam groove 25 on the inner surface of the barrel 2 and a knock member 6 for pressing the cam member 5 forward. It is composed of an elastic body 7 (for example, a compression coil spring) that urges the writing body 3 rearward. The withdrawal mechanism is a double knock type in which both the pen tip protruding operation and the pen tip immersive operation press the knock member 6 forward.

-Rotating member The rotating member 4 is provided with three ridges 41 extending in the longitudinal direction on its outer surface, and the ridges 41 are engaged with the cam groove 25. The rotating member 4 is a cylindrical synthetic resin molded body. The rear end of the cursive 3 is always in contact with the inner wall of the rotating member 4.

-Cam member The cam member 5 is a cylindrical synthetic resin molded body. An engaging projection 52 that slides in the cam groove 25 and a cam projection 51 that engages with the rear end of the ridge 41 of the rotating member 4 are provided at the front end of the cam member 5.

Knock member The knock member 6 is a tubular body and includes a front cylinder portion that opens forward and a rear cylinder portion that opens rearward. The rear end portion of the rotating member 4 is inserted into the opening of the front cylinder portion. On the outer surface of the front cylinder,
A locking wall portion 62 that projects outward in the radial direction is formed. The front end of the knock member elastic body 9 is locked to the locking wall portion 62. A friction portion 8 made of an elastic material (for example, silicone resin, SBS resin, SEBS resin, etc.) is fixed to the opening of the rear cylinder portion.

A regulation wall portion 61 that can be inserted into the rear end hole 22 is formed on the outer surface of the side wall of the knock member 6. The cross-sectional shape of the outer surface of the regulation wall portion 61 corresponds to the cross-sectional shape of the inner surface of the rear end hole 22, and has a regular hexagonal shape. The cross-sectional shape of the outer surface of the regulation wall portion 61 may be any shape as long as it is non-circular, and in addition to the hexagonal shape, for example, a regular polygon such as an equilateral triangle or a regular quadrangle, or an elliptical shape. There may be. Further, the cross-sectional shape of the outer surface of the friction portion 8 corresponds to the cross-sectional shape of the inner surface of the rear end hole 22, and has a hexagonal shape. As a result, the friction portion 8 becomes a part of the regulation wall portion 61 and can be inserted into the rear end hole 22. Since the cross-sectional shape of the outer surface of the regulation wall portion 61 has a non-circular shape or a polygonal shape, it is easy to pinch the regulation wall portion 61 with a finger and rotate it.

-Knock member elastic body The knock member 6 is urged forward by the knock member elastic body 9 (for example, a compression coil spring). The elastic force of the knocking member 9 is set to be smaller than the elastic force of the elastic body 7 that biases the cursive 3 backward. The front end of the knock member elastic body 9 is locked to the locking wall portion 62 of the knock member 6, and the rear end of the knock member elastic body 9 is the rear end portion of the barrel 2 (rear shaft 2c). Locked to the inner wall. When the knock member 6 is urged forward of the knock member elastic body 9, the knock member 6 and the cam member 5 are always in contact with each other in the front-rear direction.

-Operation of the regulation wall portion of the knock member FIGS. 1, 2, 5, and 6 show a state in which the knock member 6 can be pressed forward.
In this state, the regulation wall portion 61 is arranged in the rear end hole 22 so as to be movable in the front-rear direction. The pen tip 31 can be moved in and out.

3, FIG. 4, FIG. 7 and FIG. 8 show a state in which the forward pressing operation of the knock member 6 is blocked.
In this state, at the same time as pulling the knock member 6 backward against the axle cylinder 2 against the rearward bias of the knock member elastic body 9 from the states of FIGS. 1, 2, 5, and 6. Obtained by rotating. In this state, the front end of the regulation wall portion 61 is brought into contact with the opening edge portion of the rear end hole 22, and the knock member 6 is prevented from moving forward. As a result, stable friction operation using the friction portion 8 becomes possible.

The thermochromic writing tool 1 of the present embodiment accommodates cursive ink inside the cursive 3, and provides a pen tip 31 capable of ejecting the thermochromic ink at the front end of the cursive 3, and writes the cursive. The body 3 is housed in the barrel 2 so as to be movable in the front-rear direction, the knock member 6 is projected rearward from the rear end hole 22 of the barrel 2, and the knock member 6 is pressed forward to push the pen tip 31 forward. Is projected from the front end hole 21 of the barrel 2 and the knock member 6 is pressed forward again to release the pen tip protruding state, and the pen tip 31 is moved into the barrel 2 from the front end hole 21 of the barrel 2. The cursive of the heat-discoloring ink is rubbed against the outer surface of the rear end portion of the knock member 6, and the frictional heat generated at that time can thermally change the cursive of the heat-discoloring ink. A thermochromic writing tool provided with a friction portion 8, wherein the infestation mechanism is formed on the inner surface of the barrel 2, and a plurality of cam teeth 24 and cams extending in the front-rear direction alternately arranged along the circumferential direction. A rotating member 4 having a groove 25 and a plurality of ridges 41 rotatably arranged behind the cursive 3 with respect to the barrel 2 and alternately engaged with the cam teeth 24 or the cam groove 25. And, behind the rotating member 4, a plurality of cam protrusions 51 which are arranged so as to be non-rotatable with respect to the barrel 2 and movable in the front-rear direction and rotate the rotating member 4 are provided, and the inner surface of the barrel 2 is provided. A cam member 5 having a plurality of engaging protrusions 52 that are movably engaged with the cam groove 25 of the above, a knock member 6 that presses the cam member 5 forward, and the cursive 3 are urged rearward. The elastic body 7 is provided, and the cross-sectional shape of the inner surface of the opening of the rear end hole 22 of the barrel 2 is non-circular, and can be inserted into the rear end hole 22 on the side wall of the knock member 6. The regulation wall portion 61 is formed, and the cross-sectional shape of the outer surface of the regulation wall portion 61 is a non-circular shape corresponding to the shape of the inner surface of the rear end hole 22, and the regulation wall portion 61 of the knock member 6 is said. When it is inside the rear end hole 22, the knock member 6 can be pressed forward, and when the regulation wall portion 61 of the knock member 6 is positioned behind the opening of the rear end hole 22, the above-mentioned The knock member 6 becomes rotatable with respect to the barrel 2, the knock member 6 is rotated with respect to the barrel 2, and the front end of the regulation wall portion 61 of the knock member 6 is the rear end of the barrel 2. When in contact with the opening edge of the hole 22, the knock member 6 is prevented from moving forward.

According to the above configuration, the thermochromic writing instrument 1 of the present embodiment enables stable friction operation using a friction body regardless of whether the pen tip is in the immersive state or the pen tip is in the protruding state. Moreover, it is possible to avoid inadvertently pressing the knock member 6 when not in use to accidentally cause the pen tip 31 to protrude.

In the thermochromic writing instrument 1 of the present embodiment, the knock member 6 is urged forward with respect to the barrel 2, and the regulation wall portion 61 of the knock member 6 can move in the front-rear direction. It is arranged in 22. As a result, the regulation wall portion 61 is always arranged in the rear end hole 22 during normal writing use, so that the regulation wall portion 61 is carelessly arranged except when the friction portion 8 is used for friction operation. The front end is located behind the opening edge of the rear end hole 22, and it is possible to prevent the front end of the regulation wall portion 61 of the knock member 6 from coming into contact with the opening edge of the rear end hole 22.

1 Thermal discoloration writing tool 2 Shaft cylinder 21 Front end hole 22 Rear end hole 23 Step part 24 Cam tooth 25 Cam groove 2a Front shaft 2b Intermediate shaft 2c Rear shaft 3 Writing body 31 Pen tip 32 Ink storage tube 4 Rotating member 41 Protrusion 5 Cam member 51 Cam protrusion 52 Engagement protrusion 6 Knock member 61 Restriction wall part 62 Locking wall part 7 Repellent 8 Friction part 9 Repellent for knock member

Claims (2)

A thermochromic ink is housed inside the cursive, a pen tip capable of ejecting the heat-coloring ink is provided at the front end of the cursive, and the cursive is housed in a barrel so as to be movable in the front-rear direction. A knock member is projected rearward from the rear end hole of the barrel, and the knock member is pressed forward to bring the pen tip into a protruding state from the front end hole of the barrel, and the knock member is pressed forward again. The pen tip is provided with a retracting mechanism that releases the protruding state of the pen tip and allows the pen tip to be immersed in the barrel through the front end hole of the barrel, and rubs the cursive of the heat-discoloring ink on the outer surface of the rear end of the knock member. A heat-discoloring writing tool provided with a friction portion capable of thermally discoloring the cursive of the heat-discoloring ink by the frictional heat generated at that time.
A plurality of cam teeth and cam grooves extending in the front-rear direction, which are formed on the inner surface of the barrel and are alternately arranged along the circumferential direction, and a rotation mechanism behind the writing body with respect to the barrel. A rotating member that is possibly arranged and has a plurality of ridges that can be alternately engaged with the cam teeth or the cam groove, and behind the rotating member, which is non-rotatable with respect to the axle and can move in the front-rear direction. A cam member having a plurality of cam protrusions for rotating the rotating member and having a plurality of engaging protrusions movably engaged with the cam groove on the inner surface of the axle cylinder, and the cam member forward. A knock member that presses against the body and a projectile that urges the writing body rearward are provided.
The cross-sectional shape of the inner surface of the opening of the rear end hole of the axle tube is a non-circular shape, and
A regulation wall portion that can be inserted into the rear end hole is formed on the side wall of the knock member, and the cross-sectional shape of the outer surface of the regulation wall portion is a non-circular shape corresponding to the shape of the inner surface of the rear end hole.
When the regulation wall portion of the knock member is inside the rear end hole, the knock member can be pressed forward.
When the regulation wall portion of the knock member is positioned behind the opening of the rear end hole, the knock member becomes rotatable with respect to the axle cylinder.
When the knock member is rotated with respect to the axle and the front end of the regulation wall portion of the knock member is in contact with the opening edge of the rear end hole of the axle, the knock member moves forward. A thermochromic writing instrument characterized by being blocked. The thermochromic writing instrument according to claim 1, wherein the knock member is urged forward with respect to the barrel, and the regulation wall portion of the knock member is arranged in the rear end hole so as to be movable in the front-rear direction.

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