JP4848995B2 - Eraser - Google Patents

Description

  The present invention relates to an erasing tool for erasing (removing) a fixed object on a surface such as a paper surface such as toner printing on a paper surface by a dry copying machine, postcard printing by a printer, oil-based ballpoint pen handwriting on a paper surface, gas range stains, and the like.

Conventionally, eraser containing abrasives, cutter blade and paper file erase toner on paper using a dry copier, erase postcard printing on a printer, erase oil-based ballpoint pens on paper, and clean the gas range ( Removed).
In addition, an eraser that improves the erasability of the pencil core handwriting and an eraser that can erase details and a wide range of the pencil core handwriting are known.
Japanese Patent Laid-Open No. 10-219154. Japanese Patent Application Laid-Open No. 11-309991. JP 2005-335211 A.

In Patent Document 1, it is desirable that a predetermined amount of ferromagnetic metal powder is blended with an eraser raw material including a plastic base material and a plasticizer, and the average particle size of the ferromagnetic metal powder is preferably 1 to 25 μm. In addition, the blending amount of the ferromagnetic metal powder is preferably 5 to 35% by weight, and the ferromagnetic metal powder is preferably an Fe-Si alloy powder or an Fe-Cr alloy powder. The technical content is disclosed.
However, in the case of an eraser in which an eraser raw material is mixed with a metal powder as an abrasive, the toner printing part must be repeatedly rubbed many times to erase toner printing by a dry copying machine. There was a problem that took time. This problem is due to the fact that the abrasive compounded in the eraser is not sufficiently fixed to the eraser body on the rubbing surface. That is, the toner printing portion is obtained by fixing carbon powder or the like on the paper surface with a synthetic resin. In order to destroy the adhered toner printing portion with the abrasive, the exposed abrasive which is the rubbing surface of the eraser is peeled off from the eraser main body by the rubbing operation at the time of erasing. In addition, not only the polishing agent was peeled off, but also the polishing agent and the eraser around the polishing agent both peeled off the surface of the eraser body. Accordingly, since the abrasive escapes from the eraser body to the toner printing portion, the toner printing portion cannot be destroyed efficiently, and the number of rubs for erasing becomes large.
The eraser containing an abrasive is generally selected to have a harder eraser material in order to increase the blending of the abrasive and the fixing strength of the abrasive, and is formed to be harder than an eraser containing no abrasive. Therefore, since the eraser containing the abrasive is hard and the abrasive is blended, a feeling of roughness is generated by the rubbing operation on the paper surface or the like rather than the eraser not containing the abrasive. This rough feeling may be uncomfortable depending on the user.
In addition, the eraser with an abrasive has a problem that the erase operation load becomes higher than the eraser without the abrasive and the erasure feeling is inferior. This is because the eraser with abrasives is harder than the eraser without abrasives and the eraser with abrasives is intended to improve the erasability of the eraser without abrasives. It was by doing. Abrasion operation by increasing the pressing load on the paper surface etc. with an eraser containing abrasives is intended to increase the erasability by increasing the pressure contact strength of the abrasive against the paper surface and increasing the strength. It was to do. Incidentally, when erasing the pencil lead of an eraser that does not contain an abrasive, since the eraser is soft, even if the erasing pressure contact strength is increased, the eraser deformation degree only increases and the erasability is not improved.
On the other hand, postcard printing by a printer, oil-based ballpoint pen handwriting on paper, dirt on a gas range, etc., similarly, the number of times of erasing (removal) is abundant, the discomfort of roughness due to the rubbing operation, and the ease of erasure The feeling was inferior.
In addition, when erasing with a cutter blade or a paper file, the crushed toner powder bites between the paper fibers on the paper surface, resulting in darkening on the paper surface, or localized due to the rubbing action of a sharp blade edge, etc. There was a problem that paper was torn due to damage.
The thin rod-shaped eraser of Patent Document 2 is composed of hard and soft erasers 1 and 2 mainly composed of a plastic resin and a plasticizer, and the hard eraser and soft eraser. Reinforcing walls such as the outer shell wall 1a and the cross wall 1b, in which the material extends continuously over the entire length of the thin bar shape, and the hard eraser reinforces at least the outer peripheral surface of the thin bar shape or the vicinity thereof. A formed eraser is disclosed.
However, even a hard erasing material is made of plastic resin as a base material, so the hard erasing material is not harder than the toner printing part, so that the toner printing part fixed on the paper cannot be easily broken. Therefore, erasure was difficult.
Patent Document 3 includes an outer eraser portion and an inner eraser portion disposed inside the outer eraser portion, and the outer eraser portion accommodates an inner eraser portion. There is disclosed an eraser in which an inward eraser portion is provided, the inward eraser portion is movably disposed in the storage portion, and protrudes outward from the outward eraser portion when the inward eraser portion is used.
However, even if the outer-side eraser portion and the inner-side eraser are hard erasers in which an abrasive or the like is kneaded with a synthetic eraser or the like, similarly to Patent Document 1, the toner printing portion cannot be easily broken. have.
The present invention can easily erase (remove) the above-mentioned problems, that is, toner printing on a paper surface by a dry copying machine, postcard printing by a printer, oil-based ballpoint pen handwriting on a paper surface, dirt on a gas range, and the like. It is an object of the present invention to provide an erasing tool that suppresses discomfort, suppresses a decrease in erasure, and prevents darkening of the paper surface (scratched surface) or tearing of the paper.

  The present invention opens at least the front of a soft, easy-wearing eraser, and a soft rod-like body is disposed in the opening of the eraser. In the erasing tool provided with the above, the gist is that the hard-wearing surface of the rod-shaped body protrudes forward from the front end of the eraser.

  The present invention opens at least the front of a soft, easy-wearing eraser, and a soft rod-like body is disposed in the opening of the eraser. In the erasing tool provided with the above, the sticky surface of the rod-shaped body is projected forward from the front end of the eraser. Therefore, the toner printing on the paper surface by the dry copying machine, the postcard by the printer Easily erases (removes) printing, oil-based ball-point pen handwriting on paper, gas range stains, etc., reduces the unpleasant feeling of roughness during the erasing operation, suppresses the reduction in erasure, and the paper surface (scratched surface) ) It is possible to provide an eraser that prevents darkening and paper tearing.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 to 4 show a first embodiment. FIG. 1 is a front view showing the erasing tool in cross section (only the rod-like body 2 is an external view), FIG. 2 is a top view of FIG. 1, and FIG. 3 is an enlarged schematic cross-sectional view of the spherical portion 2a of FIG. FIG. 4 shows an erase operation diagram.
Reference numeral 1 is a soft and easily wearable eraser having elastic resilience formed by extrusion molding into a square tube shape. The cross-sectional outer shape of the eraser 1 is a square having a side of 13.0 mm, a round corner having a radius of 4.0 mm is provided at a square corner, and the inner diameter of the through hole 1a is provided at 5.0 mm. In addition, a curved surface portion 1b having a radius of 4.0 mm is provided around the front of the eraser 1. The hardness of the eraser 1 is provided at A60 to 80 in terms of the durometer hardness (jis k 6253-1997) of the vulcanized rubber. The eraser 1 is roughly classified into three types depending on the material used as a base material, and is a rubber-based eraser made by mixing and vulcanizing a rubber material and a filler, a polyvinyl chloride material, a plasticizer and a filler. A polyvinyl chloride eraser produced by heating and gelling a plastisol mixed with a plastisol, and a thermoplastic elastomer eraser produced by mixing a thermoplastic elastomer material and a filler can be used.
A substantially cylindrical rod-like body 2 is provided in front of the through-hole 1a of the eraser 1. The rod-like body 2 is inserted (attached) with low strength so that it can easily move backward in the through hole 1a of the eraser 1. Moreover, the through hole 1a of the eraser 1 is provided in a straight shape. This is because the insertion (mounting) pressure of the rod-shaped body 2 with respect to the eraser 1 can be made constant at any position before and after the through hole 1a. The reason why the eraser 1 is extrusion-molded is that the through-hole 1a is provided in a straight shape due to the characteristics of extrusion molding.
When the eraser 1 is injection-molded, the eraser 1 may be formed in a bottomed shape in which the front of the eraser 1 is opened and the rear is closed, or may be a through hole having no bottom. However, it is preferable that the shape of the front or back of the opening or the through hole of the eraser 1 is a straight shape or a tapered shape whose diameter is reduced toward the front and rear, and is kept to a slight gradient. In addition, when it has adhesiveness according to the kind (property) of the base material of the eraser, it is preferable to perform a treatment such as a fluororesin coating on the core pin of the mold that forms the opening or the through hole. Incidentally, when a large taper for mold release is formed in the opening or through hole of the eraser 1, the mounting pressure of the rod-like body 2 becomes loose at the part where the opening or through hole is widened. At the narrowed portion, the mounting pressure of the rod-shaped body 2 becomes tight, and the insertion (mounting) pressure of the rod-shaped body 2 with respect to the eraser 1 cannot be made constant.

The rod-shaped body 2 is provided with a convex spherical spherical surface portion 2a having a radius of 5.0 mm at the tip, and the outer diameter of the flange portion 2b around the spherical surface portion 2a is 6.0 mm, which is 1 mm from the inner diameter of the through hole 1a of the eraser 1. The outer periphery is provided as a flange 2b. The spherical surface portion 2a is provided so as to protrude forward from the front end of the eraser 1. Behind the spherical surface portion 2a, a cylindrical tip post portion 2c having an outer diameter of 5.4 mm is provided. The outer diameter of the leading post 2c is slightly larger than the inner diameter of the through hole 1a of the eraser 1, and is slightly in pressure contact with the inner diameter of the through hole 1a of the eraser 1, but hinders backward movement in the through hole 1a. It is provided so that there is no. A cylindrical middle column portion 2d having an outer diameter of 2.9 mm is provided behind the leading column portion 2c. A rear column 2e having a diameter slightly larger than that of the middle column 2d and rounded at the rear end is provided behind the middle column 2d. The rod-like body 2 is formed of a soft material having elastic resilience, and this hardness is a durometer hardness of vulcanized rubber, and is provided in A30 to 70 which is equivalent to less than 1 eraser hardness.
As a soft material for the rod-like body 2, synthetic rubbers include butadiene rubber, polyisoprene, chloroprene rubber, nitrile rubber, which is a diene synthetic rubber, butyl rubber, ethylene propylene rubber, urethane rubber, chlorosulfonated, which are non-diene synthetic rubbers. Examples of polyethylene, acrylic rubber, fluororubber, and other rubbers include silicon rubber, chlorinated polyethylene, epichlorohydrin, and polysulfide rubber. Further, thermoplastic elastomers (urethane-based, olefin-based, styrene-based, polyamide-based, polyester-based, nitrile-based), soft vinyl chloride resin, urethane-based gelling agents, and the like can also be used.
The surface of the spherical surface portion 2a of the rod-like body 2 is formed on a wear-resistant surface by a number of sharp, hard and fine abrasive grains 2g (see FIG. 3).
The average particle diameter of 2 g of abrasive grains is 10 to 500 μm. More preferably, the average particle diameter of the pulverized particles is set to 30 to 200 μm from the crushing efficiency of the toner printing portion and the suppression of the surface roughness of the paper. As the material of the abrasive grains 2g, sharply pointed pulverized particles such as hard iron oxide, aluminum oxide, silicon carbide, natural stone, and artificial diamond are used. The abrasive grains 2g are bonded to the surface of the spherical portion 2a with an adhesive 2h. The adhesive 2h is made of vinyl resin, epoxy resin, polyurethane, modified acrylic resin (UV curable), reactive acrylic resin, silicone resin, modified silicone resin, polysulfide resin, urea resin, Synthetic resin adhesives such as melamine resin, phenol resin, α-olefin-maleic anhydride resin, emulsion adhesives such as acrylic resins, hot melt adhesives such as elastomers, and chloroprene rubber solvents Examples include synthetic rubber adhesives such as shapes. The adhesive 2h is preferably a soft and elastic restoring adhesive so that the softness of the rod-like body 2 is not impaired. However, it is preferable to form the coating layer of the adhesive 2h very thin, and if the softness is not impaired so much, a slightly harder adhesive may be used.
A cylindrical pipe 2 f is surrounded and arranged around the rear of the rod-like body 2. The outer diameter of the pipe 2f is 5.0 mm and is provided so as not to hinder the backward movement of the eraser 1 in the through hole 1a. The pipe 2f is joined so as not to come out from the rod-like body 2 by expanding the outer diameter of the rear pillar portion 2e of the rod-like body 2 from the inner diameter of the pipe 2f. The pipe 2f uses a thermoplastic resin harder than the rod-like body 2. The thermoplastic resin materials include acrylonitrile / styrene resin, acrylonitrile / butadiene / styrene resin, polyvinyl chloride resin, polyacetal resin, and polyamide resins. (PA6, PA66, PA610, PA11, PA12), polyarylate resin, thermoplastic elastomers (urethane, olefin, styrene, polyamide, polyester, nitrile), polyetheretherketone, polysulfone resin, low density Polyethylene, high density polyethylene, linear low density polyethylene, polyethylene terephthalate, polycarbonate resin, polystyrene resin, polyphenylene ether resin, polyphenylene sulfide resin, polybutadiene resin, polyethylene Butylene terephthalate resin, polyethylene naphthalate resin, polypropylene resins, and methacryl resins.
Around the eraser 1, a sleeve 3 which is a rectangular tube member and is made of a thin paperboard or a thin resin film which is easily deformed by pressing is mounted. The sleeve 3 is provided to prevent dirt such as adhesion of hand grease to the eraser 1 and to prevent external migration of the plasticizer in the case of a polyvinyl chloride eraser.
Further, when the eraser 1 becomes shorter due to wear, a part of the sleeve 3 is broken or a part of the sleeve 3 is bent so that the eraser 1 can easily protrude from the front of the sleeve 3. It should be noted that the sleeve 3 may be provided with a plurality of all-round broken lines on the front and rear sides so that the sleeve 3 can be easily broken according to the wear of the eraser 1. Further, when the outer surface of the eraser 1 is coated with a synthetic resin to make the eraser 1 difficult to get dirty, the sleeve 3 may not be provided.

The operation will be described (see FIG. 4). Reference numeral P denotes a paper surface on which toner is printed. First, erasing of the toner printing portion on the paper surface will be described. When the front of the sleeve 3 of the erasing tool is held with fingers and the tip of the erasing tool is pressed against the paper surface at an inclination angle of about 70 degrees, which is a general erasing operation angle, the eraser 1 and the rod-like body that are the tip of the erasing tool 2 and at the same time, since the eraser 1 and the rod-like body 2 are soft, they come into contact with each other so that they are slightly crushed. Next, when the erasing tool is rubbed, a large number of abrasive grains 2g of the spherical surface portion 2a of the rod-like body 2 are moved to the toner printing portion on the paper simultaneously with the eraser 1 while being pressed. At this time, the large number of abrasive grains 2g crush the toner printing portion, and the toner printing portion becomes crushed powder and is detached from the paper surface.
The crushing action of the toner printing portion is as follows. Since the eraser 1 is a soft and elastic restoring material, it has a pressure deformation property. Moreover, since the sleeve 3 is also thin, it has a press deformation property. Here, when the front of the sleeve 3 is held with fingers during erasing, both the sleeve 3 and the eraser 1 are pressed and deformed, and the holding force of the fingers presses around the pipe 2 f of the rod-like body 2. That is, by holding the periphery of the sleeve 3 with fingers during erasing, the pipe 2 f around the rod-like body 2 is indirectly held via the sleeve 3 and the eraser 1. The holding force indirectly holds the pipe 2f around the rod-like body 2, so that the rod-like body 2 coupled to the pipe 2f is also supported. Therefore, in the operation of rubbing the erasing tool, the rod-shaped body 2 is indirectly supported by fingers, and the abrasive grains 2g of the rod-shaped body 2 are in pressure contact with the toner printing portion on the paper simultaneously with the eraser 1. It is in. The abrasive particles 2g of the rod-like body 2 supported by the indirect finger holding force collide with the toner printing portion on the paper surface with the pressure moving force when rubbing the erasing tool. Due to this collision, the abrasive grains 2g of the rod-like body 2 are sharp, hard and fine, so the solid resin layer of the toner printing portion on the paper surface is crushed. At this time, since a large number of abrasive grains 2g of the rod-like body 2 are supported by the holding force by fingers, the abrasive does not escape from the eraser body like an eraser with an abrasive to the toner printing portion, and thus the efficiency. Thus, the toner printing portion can be crushed.
The crushed powder separated from the toner printing portion is taken into the surface of the eraser 1 that is pressed and moved simultaneously with the rod-like body 2. The surface of the eraser 1 taking in the crushed powder that has been detached peels off the surface by pressure movement. The separated crushed powder is taken in during the extinguishing and removed from the paper surface. That is, the scraping of the erasing tool efficiently crushes the toner printing portion by the rod-like body 2, the removal of the crushed powder on the surface of the eraser 1, and the surface peeling (erasing) of the eraser 1 incorporating the detached crushed powder. But it happens almost at the same time. By removing the crushed powder from the toner printing portion by erasing, almost no crushed powder from the toner printing portion remains on the paper surface, thereby preventing the erased portion on the paper surface from becoming dark.
In the continuous reciprocating rubbing operation by the erasing tool, the rod-like body 2 is inserted so that it can easily move backward in the through-hole 1a of the eraser 1 according to the wear length of the eraser 1 simultaneously with the progress of the wear of the eraser 1. Therefore, the rod-like body 2 moves backward in the through hole 1a according to the wear of the eraser 1.
Even if the paper fibers on the paper surface are fluffed with 2 g of the abrasive particles 2 of the rod-like body 2, the eraser 1 acts so as to level the fluff. That is, due to the surface pressure contact between the eraser 1 and the rod-shaped body 2 against the paper surface and the fluffing action of the paper fibers of the eraser 1, the erasing method according to the present embodiment is compared with the erasing method using a cutter blade or the like, The paper surface is less likely to be damaged locally, paper breakage is less likely to occur, and the fluff of paper fibers can be leveled. Further, since the eraser 1 is provided with the curved surface portion 1b, the eraser 1 and the abrasive grain 2g of the rod-shaped body 2 can be moved to the paper surface P even in the erasing operation by a general inclination as compared with the case where the curved surface portion 1b is not provided. The simultaneous pressure contact parts are equalized, and the balance of the erasing operation is made good. In addition, since the eraser 1 is provided in a square tube shape, if the phenomenon that the toner printing crushed powder remains on the paper surface (darkening) occurs, the eraser 1 has a square shape. That is, the darkening can be eliminated without bringing the abrasive grains 2g into contact.
The hardness of the eraser 1 is preferably provided at A60 to 80 in terms of the durometer hardness of the vulcanized rubber (jis k 6253-1997). When the hardness of the eraser 1 is set in the above range, the lightness of the erase touch by rubbing the paper surface of the eraser does not decrease, and the eraser 1 can be easily erased. However, if the outer diameter of the eraser 1 is reduced to 6.0 mm for erasing small prints, the eraser strength (waistness) will be weakened. Even if the properties are slightly reduced, the thin eraser 1 is preferably provided with a high hardness of A70 to 90.
In this embodiment, even if the periphery of the erasing tool is held and the erasing tool is strongly pressed perpendicularly to the paper surface p, the rod-like body 2 is not buried in the through hole 1a of the eraser 1. This is because the rod-like body 2 is indirectly held by fingers holding the periphery of the erasing tool, so that the rod-like body 2 is prevented from being buried in the through hole 1 a of the eraser 1. Since the eraser 1 and the rod-shaped body 2 are also soft materials by pressing against the paper surface p, both the eraser 1 and the rod-shaped body 2 are pressed and deformed in front of the fingers. Therefore, it is more difficult for the rod-shaped body 2 to move in the through hole 1a of the eraser 1 than the rod-shaped body 2 is a hard material. Further, since the outer diameter of the flange portion 2b of the rod-shaped body 2 is 6.0 mm and is formed to be 1.0 mm larger than the inner diameter of the through hole 1a of the eraser 1, it enters the through hole 1a of the eraser 1 of the flange portion 2b. Immersion is prevented. Thereby, since the rod-shaped body 2 is not buried in the through hole 1a of the eraser 1, the rod-shaped body 2 is always positioned so as to protrude from the tip of the eraser 1 according to the wear of the eraser 1.
Since the abrasive grains 2g of the rod-like body 2 are hard and hard to wear, they are harder than the resin solid layer of the toner printing portion on the paper surface and hardly wear even when used repeatedly.

As a further effect in improving the toner pulverization property and suppressing paper surface roughness, the abrasive grains 2g are bonded to the spherical surface portion 2a of the rod-like body 2 having a softness and resiliency equivalent to or less than that of the eraser 1, so that it is erased by a rubbing operation. When the tool is pressed against the paper surface p, the pressed spherical portion 2a is crushed into a planar shape, and a large number of abrasive grains 2g on the crushed surface of the spherical portion 2a are in a state where the pressure contact load is even and aligned in a flat shape. Press contact with the paper surface p. By the surface pressing action of the large number of abrasive grains 2g, it is possible to widen the press-contact area to the paper surface than the hard abrasive-containing eraser. Therefore, the pressure contact area on the paper surface can be widened, and the abrasive grains 2g corresponding to the increased pressure contact area are pressed against the paper surface with an equal load. Therefore, even if the abrasive particles 2g larger than the abrasive of Patent Document 1 are used. The increase in paper surface roughness can be suppressed. In addition, since 2 g of abrasive grains larger than the abrasive of Patent Document 1 can be used, the toner printing crushability can be improved and the erasability can be improved. Since the pressure contact area on the paper surface can be made wider than that of a hard abrasive-containing eraser, it is possible to avoid the concentration of the extreme portion of the pressure contact portion on the paper surface and to suppress the extreme wear on the paper surface. Furthermore, since the eraser 1 and the rod-like body 2 are both soft and not hard like an eraser with an abrasive, the roughness of the rubbing operation on the paper surface or the like is reduced compared to an eraser with a hard abrasive, and the operation becomes uncomfortable. Can be reduced. Also, the eraser 1 and the rod-shaped body 2 are both soft, not hard like an eraser with an abrasive, and better in toner pulverization than an eraser with an abrasive. It can be made lighter and can approach the lightness of the erase operation of an eraser that does not contain abrasives.
In addition, erasure of oil-based ball-point pen handwriting of medium viscosity inks (including high viscosity inks around 10,000 mPa · s) of 5000 mPa · s, postcard printing by printers, and erasing of gas range stains by foods, It is a removal of foreign matters fixed on a surface such as a paper surface and can be erased in the same manner as toner printing on a paper surface by a dry copying machine. Incidentally, it is difficult to erase the handwriting deeply soaked in the paper with a low viscosity dye ink or oil-based ink of 1000 mPa · s or less because the ink including the soaked ink and the surrounding paper need to be removed. However, even with low-viscosity dye inks and oil-based inks, handwriting with inks that are difficult to soak and containing water repellent or oil repellent in the ink composition, printing that is printed thinly to the extent of penetration near the surface, art paper In addition, handwriting and printing with a light ink penetration, such as handwriting written on impermeable or impermeable surfaces such as synthetic paper and postcards, can be erased.
As an additional effect, since the eraser 1 and the sleeve 3 are provided in a rectangular tube shape, it is less likely to roll on a desk or the like than in a cylindrical shape.

5 and 6 show a second embodiment. FIG. 5 shows an enlarged cross-sectional view of the main part of the rod-shaped body 12, and FIG. 6 shows an enlarged schematic view of the spherical surface part 12a of FIG. The difference from the first embodiment is that the sheet 12i is interposed between the abrasive grains 12g of the rod-like body 12 and the spherical surface portion 12a, and the periphery of the sheet 12i is a flange portion 12b so that the diameter is larger than that of the front column portion 12c. It is to provide.
As a method for joining the abrasive grains 12g and the like, first, an adhesive 12h is applied to the surface of a resin film with good adhesion, or a soft cloth sheet 12i made of synthetic fibers or natural fibers, and the abrasive grains 12g are dropped and joined. After the adhesive 12h is cured, the sheet 12i is punched out into a disk shape. Next, the back surface of the sheet 12i punched into a disk shape with the abrasive grains 12g bonded thereto and the surface of the spherical portion 12a of the rod-shaped body 12 are formed into a spherical shape similar to that of the spherical portion 12a of the rod-shaped body 12. In this way, the bonding jig is used to bond with the adhesive 12h.
The effect is the same as in the first embodiment, but the sheet 12i to which the abrasive grains 12g are bonded can be formed in the previous process, the sheet 12i is punched into a circle, and further, the bonding between the sheet 12i and the rod-shaped body 12 and the process are performed. They can be managed separately. Furthermore, when the sheet 12i is formed of fibers such as cloth, the flexibility is not impaired, and the abrasive grains 12g can be bonded to the surface of the sheet 12i by utilizing the fiber weave (the bonding area is widened). Therefore, the bonding strength can be increased compared to bonding the abrasive grains 12g to a smooth sheet surface. Even in joining the back surface of the sheet 12i and the surface of the spherical surface portion 12a of the rod-like body 12, joining can be performed by using a fiber weave, so that the joining strength can be increased rather than joining smooth surfaces.

7 and 8 show a third embodiment. 7 is a front view (only the rod-like body 22 is shown in appearance), and FIG. 8 is a top view of FIG. The difference between the first embodiment and the second embodiment is that the eraser 21 and the sleeve 23 are provided in an elliptical cylindrical shape, the through hole 21a of the eraser 21 is provided in an elliptical hole shape, and can be moved backward by being attached to the through hole 21a. Thus, the rod-shaped body 22 is provided in an elliptical column shape. The middle column portion 22d behind the front column portion 22c of the rod-shaped body 22 is provided in a thin columnar shape, and a diameter-enlarged portion 22j that increases in diameter is provided at the rear end of the middle column portion 22d. A bottomed cylindrical cylindrical body 22k is provided so that the middle column portion 22d of the rod-shaped body 22 can be accommodated forward and inserted into the through hole 21a of the eraser 21. A cylindrical groove 22l recessed in the outer peripheral direction is provided in front of the hole of the cylindrical body 22k, and the cylindrical body 22k is coupled to the rod-shaped body 22 so that the enlarged diameter portion 22j of the rod-shaped body 22 is fitted into the groove 22l. is doing.
The operational effects are the same as in the first and second embodiments, but the stick-shaped body 22 is provided in the shape of an elliptical column, so that the toner printing area is wider or larger than the Mincho font such as Gothic characters. In the case of printing, the eraser 21 may be erased on the long axis side (wide side) of the ellipse. When the printing interval is narrow and only the central printing is erased, the eraser 21 should be erased on the short axis side (narrow side) of the ellipse 21. In this example, the rod-like body 22 has an elliptical column shape and is inserted into the elliptical hole of the through hole 21a of the eraser 21. Therefore, the rod-like body 22 does not rotate within the through hole 21a of the eraser 21, and the eraser 21 and the rod-like body. The body 22 can be kept in the same direction.

The front sectional view of a 1st example. The top view of FIG. FIG. 2 is an enlarged schematic cross-sectional view of a spherical portion 2a in FIG. Erase operation diagram. The principal part expanded sectional view of the rod-shaped body 12 of a 2nd Example. FIG. 6 is an enlarged schematic cross-sectional view of FIG. 5. Front sectional view of the third embodiment. FIG. 8 is a top view of FIG. 7.

Explanation of symbols

1, 21 Eraser 1a, 21a Through-hole ib, 21b Curved surface portion 2, 12, 22 Rod-shaped body 2a, 12a, 22a Spherical surface portion 2b, 12b, 22b Saddle portion 2c, 12c, 22c Leading column portion 2d, 22d Middle column portion 2e Rear column part 2f Pipe 2g, 12g Abrasive grains 2h, 12h Adhesive 12i Sheet 22j Expanded diameter part 22k Cylindrical body 22l Groove 3, 23 Sleeve P Paper surface

Claims (8)

An eraser with at least the front of a soft, easy-wearing eraser, a soft rod-shaped body placed in the eraser opening, and a hard, fine-grained hard-wearing surface on the front surface of the soft rod-shaped body An erasing tool characterized in that the hard-wearing surface of the rod-shaped body protrudes forward from the front end of the eraser. 2. The eraser according to claim 1, wherein the soft rod-like body and the fine particles forming the hard-wearing surface are joined with an adhesive. 2. The eraser according to claim 1, wherein the fine particles forming the hard-wearing surface are bonded to the surface of the thin film sheet with an adhesive, and the back surface of the sheet and the soft rod-shaped body are bonded with an adhesive. The eraser according to any one of claims 1 to 3, wherein the length of the rod-shaped body is shorter than the depth of the eraser opening, and the rod-shaped body is arranged so as to be movable to the rear of the eraser. Ingredients. The eraser according to any one of claims 1 to 4, wherein a size of a peripheral edge portion of the hard-wearing surface of the rod-shaped body is larger than a size of an opening of the eraser. 6. The eraser according to claim 1, wherein the front end portion of the eraser is formed in an arc shape. The erasure according to any one of claims 1 to 6, wherein a thin rod-shaped portion is provided behind the rod-shaped body, and the thin rod-shaped portion is surrounded by a pipe harder than the thin rod-shaped portion. Ingredients. The thin rod-shaped portion is provided behind the rod-shaped body, and the thin rod-shaped portion is surrounded by a bottomed cylindrical body harder than the thin rod-shaped portion. The eraser described in Crab.

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