JP2016016562A - Erasable writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument whose ink storage tube is filled with erasable ink, and which comprises an easily replaceable elastic body for erasing written handwriting or the like by scrubbing.SOLUTION: Provided is an erasable writing instrument in which a writing refill 2 comprising an ink storage tube is filled with erasable ink, and an erasing body 3 capable of erasing the erasable ink is detachably fitted to a trunk part of a barrel 1 of the writing instrument in a protrudable manner from the trunk of the writing instrument 1. The erasing body 3 is preferably formed into a coil-shape.SELECTED DRAWING: Figure 2

Description

The present invention relates to an erasable writing instrument provided with an erasing member capable of changing or erasing a drawn line written with a writing instrument such as a ballpoint pen.

  Conventionally, various writing instruments using discolored or erasable ink that can erase written handwriting have been proposed. In particular, a reversible thermochromic composition comprising an electron-donating color-forming organic compound, a color-accepting electron-accepting compound, and a reaction medium serving as a color-changing temperature adjusting agent that determines the temperature at which the color reaction occurs is included. In addition, a reversible thermochromic microcapsule pigment, an ink containing at least water, and a writing instrument containing the ink have disclosed a technique that can easily discolor or erase a handwriting with less generation of debris by rubbing heat. (Patent Document 1).

International Publication 2008/105227 Pamphlet

  However, the invention described in the above-mentioned patent document 1 requires an operation of changing the shaft cylinder and storing the writing body when switching between the writing operation and the color changing or erasing operation, which may be troublesome. Further, since the shaft tube and the friction body are integrally formed, it is difficult to use the shaft cylinder after removing it or to replace the friction body due to wear.

In order to solve the above problems, the inventor has intensively developed the following invention.
The writing instrument of the present invention is an erasable writing instrument in which an erasable ink is filled in a writing instrument, and an erasing body capable of erasing the erasable ink is detachable from the writing instrument barrel and can protrude from the outer surface of the writing instrument barrel.

The erasable ink mentioned here maintains a predetermined color (first color) at room temperature (for example, 25 ° C.), and when the temperature is raised to a predetermined temperature (for example, 50 ° C.), it changes to another color (second color). It can be removed by rubbing the heat-colored ink having a property of returning to the original color (first color) or the drawn line with an eraser when cooled to a predetermined temperature (for example, −10 ° C.). It refers to eraser erasable ink. In addition, when it is set as the writing instrument using a thermochromic ink, the said 2nd color is made colorless, and the drawing line written in the 1st color (for example, red) is heated up, and it is made colorless the 2nd color here. Let's say "delete". Accordingly, the erased body rubs against the writing surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line to colorless, that is, erasing. Of course, the second color may be a different color from the first color other than colorless.

When using an eraser erasable ink, water and non-thermoplastic colored resin particles having an average particle diameter of 1 to 15 μm are 3 to 30% by weight and 0.1 to 10% by weight of non-thermoplastic colored resin particles based on the total amount of the ink composition. It is necessary to contain at least colored particles. The colored resin particles used in the aqueous ink of the present invention are made of colored resin particles, are non-thermoplastic, and have an average particle diameter of 1 to 15 μm. For example, in the resin particles Colored resin particles in which a colorant composed of a pigment is dispersed, colored resin particles in which the surface of the resin particle is coated with a colorant composed of a pigment, colored resin particles in which a colorant composed of a dye is attached to the resin particles, and the like It is done. In this embodiment, if the colored resin particles are non-thermoplastic and satisfy the above average particle diameter, the structure (with hollow structure, without hollow structure (solid)), shape (spherical, polygonal, flat) Is not particularly limited, but preferably has a glass transition point of 150 ° C. or higher and a thermal decomposition temperature from the viewpoint of exhibiting excellent eraser erasability, writing property, and stability over time as an ink. Further, the use of spherical colored resin fine particles having an intramolecular cross-link having a melt flow index value of less than 0.1 and having no adhesion and an average particle diameter of 1 to 15 μm is possible. desirable.
In addition, filling the erasable ink into the writing instrument includes a structure in which the ink is directly filled into an ink storage tube accommodated in a cylindrically formed shaft cylinder, a shaft cylinder on the outer surface of the writing instrument, or the like.
Further, the ink may be a solid formed in a rod-like body or the like as well as a liquid.

Further, it is desirable that the erasing body is formed in a coil shape that is a continuous ring like a coil spring. By forming it in a coil shape, it can be easily attached to a cylindrical cylinder, and in addition, it can be used by pulling out the eraser from the end of the coil. Easy to do. Further, since it can be used in small amounts, it is easy to visually check the remaining amount of the eraser.

  The eraser is preferably made of a highly wearable material. High-abrasion materials are materials that contain a plasticizer in the rubber elastic materials shown in thermoplastic elastomers and thermosetting rubbers, as represented by commercially available plastic erasers. It is desirable that it can be visually recognized.

  Further, a step is provided in the barrel portion of the shaft cylinder, and the erasing body can be brought into contact with the inner surface side of the step. By providing the step, it is possible to regulate the mounting position of the eraser on the writing instrument.

According to the present invention, by making the eraser detachable from the shaft cylinder, it is easy to use the eraser with the eraser attached to the writing instrument, or to remove the eraser and use it depending on the environment to be erased. is there. Even if the eraser is worn, it can be easily replaced with a new eraser. In addition, since the center of gravity of the writing instrument approaches the vicinity of the center of the shaft by making it mountable to the shaft tube, the weight balance is improved and a stable writing feeling can be obtained.
In addition, by using a highly wearable material such as an eraser for the eraser, the wear condition can be easily seen and dirt on the eraser surface is scraped off during use, so the handwriting is erased without staining. can do.

It is the whole figure and the sectional view in a 1st embodiment of the present invention. It is a general view which shows the abrasion state of the eraser in the 1st Embodiment of this invention. It is a perspective view of the erasure body in a 1st embodiment of the present invention. It is the whole figure in the 2nd Embodiment of this invention, and its sectional drawing. It is the whole figure in the 3rd Embodiment of this invention, and its sectional drawing.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are denoted by common reference symbols throughout the drawings.
In the axial direction of the writing instrument, the writing part side is defined as the “front” side, and the opposite side of the writing part is defined as the “rear” side.
In addition, the erasing mentioned here includes not only making the handwriting invisible by erasing with an eraser or the like but also changing to a different color (for example, colorless) when the temperature is raised with thermochromic ink.

FIG. 1 is an overall view of a writing instrument that is a first embodiment according to an embodiment of the present invention in a non-writing state, FIG. 1 (a) is a front view, and FIG. 1 (b) is a longitudinal section of FIG. 1 (a). FIG.

The shaft cylinder 1 includes a front shaft 11, a rear shaft 12 that is a body of a writing instrument that is screwed to the rear end of the front shaft 11, a grip portion 13 that has an outer surface made of a rubber elastic material on the outer periphery of the front shaft 11, and a tip It comprises a base 14 screwed in front of the shaft 11 with a screw. Behind the rear shaft 12, a feeding mechanism provided with a knock bar 15 protruding from the rear end of the shaft cylinder 1 is provided. In addition, a writing refill 2 having an ink storage tube filled with erasable ink is accommodated in the shaft tube 1. When the writing mechanism is not yet written, the drawing mechanism 21 is retracted from the front end surface of the base 14 by causing the writing refill 2 to be ejected rearward by a spring 16 fitted inside the base 14, thereby The writing portion 21 is protruded from the front end surface of the base 14 by a pressing operation of the knock bar 15 protruding outward from the rear end portion of 1 so that writing is possible. In the present invention, the form of the writing instrument is not limited to the writing instrument that causes the writing refill to appear and disappear, but may be a cap-type writing instrument that is not provided with a feeding mechanism.

The feeding mechanism includes a cylindrical inner cylinder 17 having a cam groove on the inner surface, a rotor 18 that slides and rotates back and forth as the writing refill is projected and retracted, and operates along the cam groove of the inner cylinder 17; This is a conventionally known double-knock type payout structure comprising a knock portion 19 in which the rotor 18 is operated and the knock bar 15 is mounted on the rear end side.

A writing refill 2 is built in the shaft cylinder 1, and the writing refill 2 is filled with erasable writing ink. Ink can be ejected from the writing portion 21 which is the front end portion of the writing refill 2, and various writing portions such as a ballpoint pen shape, a sign pen shape, and a fountain pen shape are arbitrarily selected.

An erasing body 3 is mounted on the outer surface of the shaft tube 1. The erasing body 3 is formed in a coil shape, and can be mounted by being inserted from the rear of the shaft cylinder 1 or by directly coiling the outer surface of the rear shaft 12. The front end of the erasing body 3 is in contact with the rear end surface 20 of the projecting portion formed to have a diameter larger than the outer diameter of the rear shaft 12 of the front shaft 11, and is located at the approximate center of the shaft tube 1 and the erasing body 3 itself. The position of the front end face of can be specified.

FIG. 2 is an overall view showing a use state of the eraser 3 attached to the writing instrument according to the first embodiment of the present invention. FIG. 2 (a) shows a state before the eraser 3 is used, FIG. 2 (b). FIG. 2C shows the state after use of the eraser 3 while the eraser 3 is in use.

The eraser 3 can erase the handwriting written with the writing refill 2 accommodated in the shaft cylinder 1. The erasing body 3 is used with the end 31 of the erasing body 3 protruding from the outer surface of the shaft tube 1 from the rear end side. The handwriting is erased by the erasing operation on the handwriting of the end portion 31 and is scraped by wear (FIG. 2 (b)). When the erasing tool 3 is completely worn (FIG. 2 (c)), the handwriting is erased. I can't do that. The erasing tool 3 can be replaced and replenished. When the erasing tool 3 is lost, the handwriting can be erased by attaching a new erasing tool 3 to the shaft tube 1 of the writing tool (FIG. 2A). The erasing operation can be used even in a writable state in which the writing portion 21 of the writing refill 2 protrudes from the front end surface of the base 14 as shown in FIG.

FIG. 3 is a component diagram showing the erasing body 3 in the first embodiment of the present invention.
The outer diameter of the erasing body 3 is smaller than the outer diameter of the protruding portion of the front shaft 11, and the inner diameter is larger than the outer diameter of the rear shaft 12.
The erasing body 3 is formed in a coil shape in order to facilitate mounting on the shaft tube 1 formed in a cylindrical shape.
As an example of the material of the eraser 3, polyvinyl chloride (manufactured by Shin-Daiichi PVC Co., P21), dibutyl phthalate (DBP), and heavy calcium carbonate are mixed at a certain ratio and made into a paste sol with a mixer. After mixing and dispersing, defoaming, press molding in a mold, and cutting after cooling can be made into a certain size and shape.

FIG. 4 is an overall view of a writing instrument that is a second embodiment according to an embodiment of the present invention in a non-writing state, FIG. 4 (a) is a front view, and FIG. 4 (b) is a longitudinal section of FIG. 4 (a). FIG.
About the code | symbol, the element which is common in 1st Embodiment is made the same.
The difference between the second embodiment and the first embodiment is that the diameter of the erasing body 3 formed in a coil shape is thicker than that of the first embodiment, and the outer surface of the shaft cylinder 1 is attached to the shaft cylinder 1. That is, the outer surface of the erasing body 3 protrudes from the outer diameter of the protruding portion of the tip shaft 11. The outer surface of the erasing body 3 can be erased on the outer surface of the erasing body 3 without the need to pull out the end 31 by protruding from the outer surface of the shaft cylinder 1.

FIG. 5 is an overall view of a writing instrument that is a third embodiment according to an embodiment of the present invention in a non-writing state, FIG. 5 (a) is a front view, and FIG. 5 (b) is a longitudinal section of FIG. 5 (a). FIG.
The reference numerals are the same as those in the second embodiment.
The difference between the third embodiment and the second embodiment is that the erasing body 3 mounted on the rear shaft 12 forms a protrusion on the rear portion of the rear shaft 12, and is mounted by fitting by riding. The eraser 3 has a shape in which a plurality of curvatures and the end portion 31 are combined, and the erase range can be easily selected.

1 Shaft cylinder 2 Written refill 3 Eraser

Claims (3)

  An erasable writing instrument in which an erasable ink is filled in a writing instrument, and an erasing body capable of erasing the erasable ink is detachable from the barrel of the writing instrument and protrudes from the barrel to the outer surface. The erasable writing instrument according to claim 1, wherein the eraser is formed in a coil shape.   The erasable writing instrument according to claim 1 or 2, wherein the erasable body is made of a highly wearable material.

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