JP2021000843A - Thermochromic writing tool - Google Patents

Abstract

To provide a thermochromic writing tool which enables a friction operation using a friction part in both state of a pen point recessed state and a pen point projection state, and can surely prevent dirt of the friction part when the friction operation is not performed.SOLUTION: A movable cylindrical body 8 is arranged between an outer surface of a knock member 6 and an inner surface of a barrel 2 so as to be movable in a cross direction and projected to a back side of a rear end hole 23. A friction part formed of an elastic material is provided on a rear end part of the movable cylindrical body 8. The movable cylindrical body 8 is structured so as to be completely recessed into the barrel 2 from the rear end hole 23. When the movable cylindrical body 8 is in the maximum projection state to the back side of the rear end hole 23, the rear end of the friction part 9 is positioned at the back side of the rear end of the knock member 6, or the rear end of the friction part 9 and front and back positions of the rear end of the knock member 6 are coincided with each other.SELECTED DRAWING: Figure 5

Description

The present invention relates to a thermochromic writing instrument.

Conventionally, for example, in Patent Document 1, a writing body is housed inside a barrel so as to be movable in the front-rear direction, a heat-discoloring ink is housed inside the writing body, and the heat-changing ink is stored at the front end of the writing body. A pen tip capable of ejecting sex ink is provided, a knock body is provided at the rear end of the barrel, and the knock body is pressed forward from the pen tip immersion state to bring the pen tip into a protruding state and the pen tip protrudes. The knock body is provided with a retracting mechanism that causes the nib to be immersed by pressing the knock body forward again from the state, and the brush stroke of the heat-discoloring ink is rubbed against the outer surface of the barrel, and the frictional heat generated at that time causes the knock body. A heat-discoloring writing instrument provided with a friction body made of a low-wear elastic material capable of heat-discoloring the brush stroke. The friction body is provided in the vicinity of the knock body at the rear end of the barrel, and the pen tip is immersed in the pen tip. A thermochromic writing instrument is disclosed in which the rear end of the knock body protrudes rearward of the rear end of the friction body more than the pen tip protruding state.

Japanese Unexamined Patent Publication No. 2014-193571

In the thermochromic writing instrument of Patent Document 1, in the pen tip immersion state, the rear end of the knock body protrudes rearward from the rear end of the friction body and larger than the pen tip protruding state, so that a friction operation using the friction body can be performed. Have difficulty. Further, in the thermochromic writing tool of Patent Document 1, since the friction body is exposed to the outside of the barrel, it is not easy to reliably prevent the friction body from becoming dirty.

The present invention solves the above-mentioned conventional problems, and when the friction operation using the friction portion is possible and the friction operation is not performed in either the pen tip immersion state or the pen tip protrusion state. Is intended to provide a heat-discolorable writing tool that can surely prevent the friction portion from becoming dirty.

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 immersed state" means a state in which the pen tip is immersed in the barrel, and the "pen tip protruding state" means a state in which the pen tip protrudes outward from the front end of the barrel. .. In the present invention, the "friction portion immersed state" means a state in which the friction portion is immersed in the shaft cylinder, and the "friction portion protruding state" is a state in which the friction portion protrudes outward from the rear end hole of the shaft cylinder. To say.

In the thermochromic writing tool according to the first invention of the present application, a thermochromic ink is housed inside the cursive 3, and a pen tip 31 capable of ejecting the thermochromic ink is provided 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 23 of the barrel 2, and the knock member 6 is moved forward from the pen tip immersion state. By pressing the pen tip 31 into a protruding state from the front end hole 21 of the barrel 2, and by pressing the knock member 6 forward from the pen tip protruding state, the pen tip 31 is pushed forward from the front end hole of the barrel 2. A hoisting mechanism for immersing the cursive from 21 into the barrel 2 is provided, and the hoisting mechanism engages with a cam portion 4 provided on the inner surface of the barrel 2 and the cam portion 4 and after the cursive 3. A rotating member 5 that abuts on the end, the knocking member 6 that engages with the rotating member 5, and an elastic body that is housed in the barrel 2 and urges the cursive 3 or the rotating member 5 rearward. The rear end portion of the barrel 2 is provided with a friction portion 9 capable of thermally discoloring the cursive of the heat-discoloring ink by rubbing the cursive of the heat-discoloring ink and the frictional heat generated at that time. It is a heat-discoloring writing tool
A movable tubular body 8 is arranged between the outer surface of the knock member 6 and the inner surface of the shaft cylinder 2 so as to be movable in the front-rear direction and to protrude rearward from the rear end hole 23, and the movable tubular body 8 is arranged. A friction portion 9 made of an elastic material is provided at the rear end portion, and the movable tubular body 8 is configured to be completely immersed in the shaft cylinder 2 from the rear end hole 23, and the movable tubular body 8 is formed. When the maximum protrusion is rearward from the rear end hole 23, the rear end of the friction portion 9 is positioned rearward from the rear end of the knock member 6, or the rear end of the friction portion 9 and the knock member 6 It is a requirement that the front and rear positions of the rear end match.

The thermochromic writing instrument 1 according to the first invention can perform a friction operation using the friction portion 9 in both a pen tip immersion state and a pen tip protruding state by the above configuration, and also a friction operation. When not, the friction portion 9 can be reliably prevented from becoming dirty.

The thermochromic writing tool 1 according to the second invention of the present application is required to have the knock member 6 penetrate through the inner hole of the movable tubular body 8 in the thermochromic writing tool according to the first invention. To do.

The thermochromic writing tool 1 according to the second invention can be provided independently with the movable tubular body 8 and the knock member 6 not interlocking with each other due to the above configuration. As a result, a configuration is obtained in which the friction operation using the friction portion 9 is possible in both the pen tip immersion state and the pen tip protrusion state.

The heat-discolorable writing instrument of the present invention can perform a friction operation using a friction portion in both a pen tip immersion state and a pen tip protruding state, and reliably stains the friction portion when the friction operation is not performed. Can be prevented.

It is a vertical cross-sectional view which shows the pen tip immersion state and the friction part immersion state 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 protruding state and the friction part immersion state 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 immersion state and the friction part protrusion state 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 and the friction part protruding state of FIG. FIG. 7 is an enlarged vertical sectional view of a main part of FIG. It is a main part perspective view which shows the friction part immersion state of FIG. It is a main part perspective view which shows the friction part protruding state of FIG. It is an exploded view which shows the appearance mechanism of FIG.

Embodiments of the writing instrument of the present invention will be described with reference to the drawings. (See FIGS. 1 to 11)
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.

-Front shaft The front shaft 2a is a tapered cylindrical synthetic resin molded body. A front end hole 21 is formed in the front end of the front shaft 2a in the front-rear direction. 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 4 is integrally formed on the inner surface of the intermediate shaft 2b. A step portion 22 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 23 is formed in the rear end of the rear shaft 2c in the front-rear direction. On the outer surface of the rear shaft 2c, a clip 25 capable of sandwiching the outer surface of the axle cylinder 2 and a pocket or the like is provided. The clip 25 is integrally formed on the outer surface of the rear shaft 2c, or is provided by attaching a separate member. A slide hole 24 extending in the front-rear direction is provided in the side wall of the rear shaft 2c in the radial direction. The inner surface of the front end portion of the rear shaft 2c is fixed to the outer surface of the rear end portion of the intermediate shaft 2b by fitting.

-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 a front end opening, and a heat-discolorable ink filled in the ink storage tube 32. It consists of a follower (for example, a high-viscosity fluid) that is filled in the rear end of the heat-discoloring ink and advances with the consumption of the heat-discoloring ink.

-Heat-changing ink The heat-changing ink is preferably a reversible heat-changing ink. The reversible thermochromic ink is a heat-decoloring type that decolorizes by heating from a color-developing state, a color memory-holding type that alternately stores a color-developing state or a decoloring state in a specific temperature range, or a decoloring state. Various types such as a heating color-developing type that develops color by heating and returns to a decolorized state by cooling from the color-developed state can be configured alone or in combination.

-Pen tip The pen tip 31 is composed of, for example, only a metal ballpoint pen that rotatably holds a ball at the front end, or a synthetic resin pen tip holder that holds the rear outer surface of the ballpoint pen tip. It may be any of. 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.

Appearance mechanism The infestation mechanism (see FIG. 11) is a knock-type infestation mechanism using a rotary cam mechanism, and is engaged with a cam portion 4 formed on the inner surface of the barrel 2 (inner surface of the intermediate shaft 2b) and the cam portion 4. A rotating member 5 that fits and abuts on the rear end of the writing body 3, a knock member 6 that engages with the rotating member 5 and the cam portion 4, and the writing body 3 are housed in the axle tube 2 and urge the writing body 3 rearward. It consists of a projectile 7 (for example, a compression coil spring). The haunting mechanism of the present embodiment is a double knock type in which both the pen tip protruding operation and the pen tip immersive operation press the knock body forward.

The cam portion 4 includes a plurality of saw-toothed cam teeth 41 projecting forward, and a cam groove 42 formed between the cam teeth 41 to which the rotating member 5 engages. The rotating member 5 is provided with three ridges 51 extending in the longitudinal direction on the outer surface thereof, and the ridges 51 are engaged with the cam groove 42 of the cam portion 4. The knock member 6 includes a guide ridge 61 that slides in the cam groove 42 of the cam portion 4 and a cam tooth 62 that engages with the rear end of the ridge 51 of the rotating member 5 at its front end.

Knock member The knock member 6 is a bottomed tubular body having an open front end and a closed rear end, and is obtained from a synthetic resin molded body. The knock member 6 includes a large diameter portion 6a and a small diameter portion 6b connected to the rear of the large diameter portion 6a. The large diameter portion 6a is housed in the intermediate shaft 2b so as to be movable in the front-rear direction. The small diameter portion 6b is housed in the rear shaft 2c so as to be movable in the front-rear direction. In the pen tip immersion state, the small diameter portion 6b of the knock member 6 is projected rearward from the rear end hole 23 of the rear shaft 2c, and the large diameter portion 6a of the knock member 6 is rearward of the rear end opening of the intermediate shaft 2b. Be projected.

A guide ridge 61 that slides in the cam groove 42 of the cam portion 4 is integrally formed on the outer surface of the front end portion (large diameter portion 6a) of the knock member 6. In the pen tip immersion state, the guide ridge 61 is locked to the step portion 22 of the intermediate shaft 2b, whereby the knock member 6 is prevented from falling out from the rear end hole 23.

Movable tubular body The movable tubular body 8 is arranged between the outer surface of the knock member 6 and the inner surface of the axle cylinder 2 (rear shaft 2c) so as to be movable in the front-rear direction and to project rearward from the rear end hole 23. Will be done. The movable tubular body 8 is obtained by a molded body made of synthetic resin. An inner hole of the movable tubular body 8 is penetrated in the front-rear direction. On the side wall of the movable tubular body 8, a slide operating portion 81 that penetrates the slide hole 24 and projects outside the shaft cylinder 2 is formed. A friction portion 9 made of an elastic material (for example, silicone resin, SBS resin, SEBS resin, etc.) is provided at the rear end portion of the movable tubular body 8.

By sliding the slide operation unit 81 in the front-rear direction, the movable tubular body 8 can be moved in the front-rear direction. The movable tubular body 8 can be completely immersed in the shaft cylinder 2 through the rear end hole 23.

Further, when the movable tubular body 8 and the friction portion 9 are in a state of being maximally projected rearward from the rear end hole 23, is the rear end of the friction portion 9 positioned behind the rear end of the knock member 6? , The front and rear positions of the rear end of the friction portion 9 and the rear end of the knock member 6 are matched. That is, the rear end of the knock member 6 is not projected behind the rear end of the friction portion 9 in either the pen tip immersion state or the pen tip protrusion state.

When the slide operation portion 81 of the movable tubular body 8 is slid rearward along the slide hole 24 from the state where the pen tip is immersed and the state where the friction portion is immersed (FIGS. 1 and 2), the movable tubular body is formed. 8 is projected rearward from the rear end hole 23, the slide operation portion 81 is brought into contact with the rear end of the slide hole 24, and the rearward movement of the movable tubular body 8 is restricted. At this time, the movable tubular body 8 and the friction portion 9 are in the maximum protruding state (FIGS. 5 and 6) from the rear end hole 23, and the rear end of the friction portion 9 at the front end portion of the movable tubular body 8 is a knock member. The rear end of 6 and the front and rear positions are the same, or are located behind the rear end of the knock member 6. In this state, the friction operation using the friction portion 9 is possible. After the friction operation using the friction portion 9, the slide operation portion 81 is slid forward along the slide hole 24, and the friction portion is immersed (FIGS. 1 and 2). In the friction portion immersion state, the slide operation portion 81 is brought into contact with the front end of the slide hole 24, and the forward movement of the movable tubular body 8 is restricted.

When the slide operation portion 81 of the movable tubular body 8 is slid rearward along the slide hole 24 from the pen tip protruding state and the friction portion immersed state (FIGS. 3 and 4), the movable tubular body 8 becomes a rear end hole. The slide operation portion 81 is brought into contact with the rear end of the slide hole 24 so as to project rearward from the 23, and the rearward movement of the movable tubular body 8 is restricted. At this time, the movable tubular body 8 and the friction portion 9 are in the maximum protruding state (FIGS. 7 and 8) from the rear end hole 23, and the rear end of the friction portion 9 at the front end portion of the movable tubular body 8 is a knock member. It is located behind the rear end of 6. In this state, the friction operation using the friction portion 9 is possible. After the friction operation using the friction portion 9, the slide operation portion 81 is slid forward along the slide hole 24, and the friction portion is immersed (FIGS. 3 and 4). In the state where the friction portion is immersed, the slide operation portion 81 is brought into contact with the front end of the slide hole 24, and the forward movement of the movable tubular body 8 is restricted.

-Infestation of the pen tip When the knock member 6 is pressed forward against the rearward bias by the elastic body 7 from the pen tip immersion state, the front end of the knock member 6 presses the rotating member 5 forward, and the rotating member The ridge 51 of 5 moves forward along the cam groove 42. As the rotating member 5 moves forward, the rotating member 5 presses the rear end of the cursive 3 forward, and the pen tip 31 projects outward from the front end hole 21. At this time, the rotating member 5 rotates by a certain angle with respect to the cam portion 4 due to the contact between the cam teeth 62 of the knock member 6 and the ridge 51 of the rotating member 5. As a result, the ridge 51 of the rotating member 5 is engaged with the cam tooth 41 of the cam portion 4, and the pen tip protruding state is maintained.

When the knock member 6 is pressed forward from the pen tip protruding state, the front end of the knock member 6 presses the rotating member 5 forward, and the cam teeth 62 of the knock member 6 and the ridge 51 of the rotating member 5 come into contact with each other. The contact causes the rotating member 5 to rotate by a certain angle with respect to the cam portion 4. As a result, the engagement state between the ridge 51 and the cam tooth 41 of the cam portion 4 is released, and the ridge 51 is rearward along the cam groove 42 of the cam portion 4 due to the rearward bias by the elastic body 7. Move to. As the rotating member 5 moves backward, the cursive 3 moves backward, and the pen tip is immersed. The guide ridge 61 is locked to the step portion 22 behind the cam portion 4, and the pen tip immersion state is maintained.

The thermochromic writing tool 1 of the present embodiment accommodates the thermochromic ink inside the writing body 3, and provides a pen tip 31 capable of ejecting the thermochromic ink at the front end of the writing body 3 to write the writing. 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 23 of the barrel 2, and the knock member 6 is pressed forward from the pen tip immersed state. As a result, 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 from the pen tip protruding state to push the pen tip 31 from the front end hole 21 of the barrel 2. A retracting mechanism for immersing the inside of the barrel 2 is provided, and the retracting mechanism engages with a cam portion 4 provided on the inner surface of the barrel 2 and the cam portion 4 at the rear end of the writing body 3. The rotating member 5 that comes into contact with the rotating member 5, the knocking member 6 that engages with the rotating member 5, and the elastic body 7 that is housed in the barrel 2 and urges the writing body 3 or the rotating member 5 rearward. The rear end of the barrel 2 is provided with a friction portion 9 capable of thermally discoloring the stroke of the heat-discoloring ink by rubbing the brush stroke of the heat-discoloring ink and the frictional heat generated at that time. A sex writing tool, the movable tubular body 8 is arranged between the outer surface of the knock member 6 and the inner surface of the shaft cylinder 2 so as to be movable in the front-rear direction and projectable rearward from the rear end hole 23. A friction portion 9 made of an elastic material is provided at the rear end portion of the movable tubular body 8, so that the movable tubular body 8 can be completely immersed in the shaft cylinder 2 through the rear end hole 23, and the above-mentioned When the movable tubular body 8 is in the maximum protruding state rearward from the rear end hole 23, the rear end of the friction portion 9 is positioned behind the rear end of the knock member 6, or is rear of the friction portion 9. The front and rear positions of the end and the rear end of the knock member 6 are matched.

According to the above configuration, the thermochromic writing instrument 1 of the present embodiment can perform a friction operation using the friction portion 9 in both a pen tip immersion state and a pen tip protrusion state, and when no friction operation is performed. Can reliably prevent the friction portion 9 from becoming dirty.

Further, in the thermochromic writing tool 1 of the present embodiment, the knock member 6 is penetrated through the inner hole of the movable tubular body 8. As a result, the movable tubular body 8 and the knock member 6 can be provided independently without being interlocked with each other. As a result, a configuration is obtained in which the friction operation using the friction portion is possible in both the pen tip immersion state and the pen tip protrusion state.

1 Thermal discoloration writing tool 2 Axle cylinder 21 Front end hole 22 Step part 23 Rear end hole 24 Slide hole 25 Clip 2a Front axis 2b Intermediate axis 2c Rear axis 3 Writing body 31 Pen tip 32 Ink storage tube 4 Cam part 41 Cam tooth 42 Cam Groove 5 Rotating member 51 Protrusion 6 Knock member 61 Guide protrusion 62 Cam tooth
6a Large diameter part 6b Small diameter part 7 Repellent body 8 Movable tubular body 81 Slide operation part 9 Friction part

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. The knock member is projected rearward from the rear end hole of the barrel, and the knock member is pressed forward from the pen tip immersion state to bring the pen tip into a protruding state from the front end hole of the barrel, and the pen tip is projected. A cam portion provided on the inner surface of the barrel is provided with a retracting mechanism that allows the pen tip to be immersed in the barrel through the front end hole of the barrel by pressing the knock member forward. A rotating member that engages with the cam portion and abuts at the rear end of the cursive, a knock member that engages with the rotating member, and the cursive or the rotating member that is housed in the barrel. The cursive of the heat-discoloring ink is rubbed against the rear end of the barrel, and the cursive generated at that time can thermally change the cursive of the heat-discoloring ink. A heat-discoloring cursive with a smooth friction part
A movable tubular body is arranged between the outer surface of the knock member and the inner surface of the shaft cylinder so as to be movable in the front-rear direction and project rearward from the rear end hole, and is elastic at the rear end portion of the movable tubular body. A friction portion made of a material is provided so that the movable tubular body can be completely immersed in the shaft cylinder from the rear end hole, and the movable tubular body is in a state of maximum protrusion rearward from the rear end hole. At this time, the rear end of the friction portion is positioned behind the rear end of the knock member, or the rear end of the friction portion and the front and rear positions of the rear end of the knock member are aligned. Thermal discoloration writing tool. The thermochromic writing tool according to claim 1, wherein the knock member is penetrated through an inner hole of the movable tubular body.

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