JP2012232484A - Friction tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction tool that can obtain the friction part of various hardness.SOLUTION: The friction tool can carry out thermal discoloration of a thermochromism image or handwriting by the frictional heat generated by rubbing the thermochromism image or the handwriting formed on the writing surface with the thermochromism ink. The friction tool includes: a body 2; an operation part 3 provided rotatably at the end part of the body 2; a friction part 4 comprising the elastic materials provided at the end part of the operation part 3; a movable body 5 that is housed in the operation part 3 and movable in a back and forth direction by rotation of the operation part 3, wherein the movable body 5 is composed to be pressable to the inside of the friction part 4.

Description

The present invention relates to a friction tool. In detail, the thermochromic image or handwriting formed on the writing surface is rubbed with the thermochromic ink, and the thermochromic image or handwriting can be thermally discolored by the frictional heat generated at that time. Concerning ingredients.

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

JP 2004-148744 A

In the friction tool of Patent Document 1, a relatively soft material is suitable for thermally discoloring a large area handwriting, and a relatively soft material is suitable for thermally discoloring a small area handwriting. ing. However, it is difficult for the conventional friction tool to obtain friction bodies having various hardnesses with one friction tool.

The present invention is intended to solve the above-described conventional problems, and to provide a friction tool capable of obtaining friction portions having various hardnesses.

The present invention rubs a thermochromic image or handwriting formed on a writing surface using a thermochromic ink, and friction that can thermally discolor the thermochromic image or handwriting by frictional heat generated at that time. A main body 2, an operation portion 3 provided rotatably at an end portion of the main body 2, a friction portion 4 made of an elastic material provided at an end portion of the operation portion 3, and the operation portion 3 The movable body 5 is housed inside and movable in the front-rear direction by the rotation of the operation unit 3, and the movable body 5 is configured to be able to press against the inner side of the friction unit 4.

The friction tool 1 of the present invention includes a main body 2, an operation part 3 provided rotatably at an end of the main body 2, a friction part 4 made of an elastic material provided at an end of the operation part 3, and the operation A movable body 5 housed inside the portion 3 and movable in the front-rear direction by the rotation of the operation portion 3, and configured so that the movable body 5 can be pressed inside the friction portion 4. By rotating the portion 3, the pressing amount of the movable body 5 to the inside of the friction portion 4 can be adjusted, and the hardness of the friction portion 4 can be adjusted. As a result, it is possible to obtain the friction portions 4 having various hardnesses.

In the friction tool 1 of the present invention, it is preferable that the main body 2 is a shaft cylinder that contains a thermochromic ink therein and has a pen tip at one end.

In the friction tool 1 of the present invention, the main body 2 may be a cap that detachably attaches to a pen tip side of a shaft cylinder that contains thermochromic ink inside and has a pen tip at one end. preferable.

Friction part In the present invention, the material constituting the friction part 4 is preferably a synthetic resin (rubber or elastomer) having elasticity, such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin. (Styrene-ethylene-butylene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like. The synthetic resin having elasticity that constitutes the friction portion 4 is a low-wear elastic material that hardly generates wear debris during friction, rather than a high-wear elastic material (such as an eraser). Preferably it consists of.

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

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

In the present invention, as shown in FIG. 4, the shape of the curve plotting the change in color density due to the temperature change is opposite to the case where the temperature is raised from the lower temperature side than the color change temperature range, and from the higher temperature side than the color change temperature range. The color changes by following a different path depending on the descending state, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)]. In FIG. 4, ΔH indicates 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.

In the present invention, the color change temperature of the thermochromic ink due to the frictional heat of the friction part 4 is set to 25 ° C to 95 ° C (preferably 36 ° C to 95 ° C). That is, in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration point [ It is effective to set the complete color development temperature (t ₁ )] in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). 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 changed in color by the frictional heat generated by the friction portion 4.

The friction tool of the present invention can obtain friction parts having various hardnesses.

It is a principal part longitudinal cross-sectional view of the friction tool of embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the pressing state of the movable part to the friction part of the friction tool of FIG. It is the sectional view on the AA line of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

An embodiment of the present invention is shown in FIGS.
The friction tool 1 of the present embodiment includes a main body 2, an operation part 3 provided rotatably at an end part of the main body 2, a friction part 4 made of an elastic material provided at an end part of the operation part 3, A movable body 5 that is movable in the front-rear direction by rotation of the operation unit 3 is provided inside the friction unit 4 and the operation unit 3.

Examples of the main body 2 include a shaft cylinder of a writing instrument having a nib at one end, or a cap that is detachably attached to the pen nib side of the writing instrument. A cylindrical portion 21 and a shaft portion 22 are projected from the end of the main body 2. An annular recess 21 a is formed on the inner surface of the tubular portion 21. An axial groove 22 a is formed on the outer surface of the shaft portion 22.

The operation unit 3 is a cylindrical body that is rotatably attached to an end of the main body 2. An internal thread portion 31 is formed inside the operation portion 3. An annular convex portion 32 is formed on the outer surface of the operation portion 3. The annular convex portion 32 is engaged with the annular concave portion 21a.

The movable body 5 includes a rod-shaped core portion 51 and a cylindrical support portion 52 that supports the core portion 51. A male screw part 52 a is formed on the outer surface of the support part 52. An axial protrusion 52 b is formed on the inner surface of the support portion 52. The male screw portion 52 a is screwed into the female screw portion 31 of the operation unit 3. The protrusion 52b is engaged with the groove 22a on the outer surface of the shaft portion 22. The movable body 5 is configured to be movable in the front-rear direction by the rotation of the operation unit 3.

The friction part 4 is made of an elastic material (for example, silicone resin, SBS resin, SEBS resin, etc.). The friction part 4 is fixed to the end of the operation part 3. The friction part 4 includes a hollow convex curved end 41 and is configured so that the end of the core 51 of the movable body 5 can be pressed inside the convex curved end 41.

The friction tool 1 of the present embodiment includes a main body 2, an operation part 3 provided rotatably at an end part of the main body 2, a friction part 4 made of an elastic material provided at an end part of the operation part 3, A movable body 5 housed in the operation unit 3 and movable in the front-rear direction by rotation of the operation unit 3, and configured so that the movable body 5 can be pressed inside the friction unit 4. By rotating the operation unit 3, the pressing amount of the movable body 5 to the inside of the friction unit 4 can be adjusted, and the hardness of the friction unit 4 can be adjusted. As a result, it is possible to obtain the friction portions 4 having various hardnesses.

DESCRIPTION OF SYMBOLS 1 Friction tool 2 Main body 21 Tubular part 21a Annular recessed part 22 Shaft part 22a Groove 3 Operation part 31 Female thread part 32 Annular convex part 4 Friction part 41 Convex-curved end part 5 Movable body 51 Core part 52 Support part 52a Male thread part 52b Projection Article

Claims (3)

A friction tool capable of rubbing a thermochromic image or handwriting formed on a writing surface using a thermochromic ink, and thermally discoloring the thermochromic image or handwriting by frictional heat generated at that time. ,
A main body, an operation portion rotatably provided at an end portion of the main body, a friction portion made of an elastic material provided at an end portion of the operation portion, and housed in the operation portion, and by rotating the operation portion And a movable body movable in the front-rear direction, wherein the movable body can be pressed against the inside of the friction portion. The friction tool according to claim 1, wherein the main body is a shaft cylinder that contains thermochromic ink therein and has a pen tip at one end. The friction tool according to claim 1 or 2, wherein the main body is a cap that accommodates thermochromic ink therein and is detachably attached to a pen tip side of a shaft cylinder provided with a pen tip at one end.

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