JP6479356B2 - Thermochromic stamp - Google Patents

Description

  The present invention relates to a stamp, and more particularly to a thermochromic stamp for imprinting a thermochromic ink on paper or the like.

  Patent Document 1 describes an ink composition for reversibly thermochromic stamps, and describes an ink containing the ink composition for reversibly thermochromic stamps, in which an image can be obtained on paper. .

Patent No. 3792497 gazette

  In the present invention, it is an object of the present invention to obtain a thermochromic stamp capable of imprinting a thermochromic ink on a sheet of paper and further capable of thermodiscoloring the thermochromic ink.

The present invention
1. A seal surface for imprinting a thermochromic ink, and a frictional portion made of an elastic material capable of thermally discoloring the image by the frictional heat by rubbing the imprint on the paper surface obtained by the thermochromic ink A thermochromic stamp having
A recess is formed in the friction portion, and a sheet member having a pattern similar to the impression obtained by the seal surface is positioned in the recess with the surface of the friction portion positioned outward from the surface of the sheet member. A thermochromic stamp characterized in that the recessed portion is in a recessed state and the sheet member is pasted so as to be surrounded by the friction portion.
2. It has a seal surface for imprinting a thermochromic ink, and a friction portion made of an elastic material which can thermally discolor the imprint by the frictional heat by rubbing the imprint on the paper surface obtained by the thermochromic ink A thermochromic stamp,
A sheet member having a through hole formed in the friction portion, a rear side of a stamp main body having the seal surface in front is fitted in the through hole, and a sheet member having a pattern similar to an image obtained by the seal surface At the rear end of the stamp body, the surface of the friction portion is positioned outward from the surface of the sheet member, and the through hole is recessed so that the sheet member is enclosed by the friction portion. Characteristic thermochromic stamp.
3. It has a seal surface for imprinting a thermochromic ink, and a friction portion made of an elastic material which can thermally discolor the imprint by the frictional heat by rubbing the imprint on the paper surface obtained by the thermochromic ink A thermochromic stamp,
The thermochromic stamp has a stamp body and a detachable cap on the front and back of the stamp body, the friction portion is provided on the opposite side of the opening of the cap, and the seal surface is obtained on the end face of the friction portion A seat member having a pattern similar to that of the stamped image is disposed, a locking portion is provided at the rear of the stamp body, a lock receiving portion is provided on the cap, and the cap is attached to the stamp body. A thermochromic stamp characterized in that the direction of the design obtained by pressing the seal surface and the direction of the design of the sheet member are made to coincide with each other by the engagement of the stop portion and the engagement receiving portion. ".

  The seal surface in the present invention has a structure (permeation seal structure) in which a penetrant material is impregnated with a thermochromic ink, or a structure in which an uneven portion on the surface is brought into contact with a stamp stand impregnated with a thermochromic ink and then imprinted. It can be used. As the above-mentioned penetration mark structure, the thing which heat-melted and sealed the surface part of the porous thermoplastic resin which has an open cell, formed the character, the figure, etc. in the part which is not sealed, and the porous which has an open cell. It is possible to use a structure in which a heated mold is pressed onto the surface of an elastic body or engraved with a laser processing machine to form characters, figures, and the like.

  The stamp body is made of ABS resin (acrylonitrile-butadiene-styrene copolymer), PP resin (polypropylene), POM resin (polyoxymethylene), PC resin (polycarbonate), PS resin (polystyrene), PET resin (polyethylene terephthalate), etc. It can be formed of a resin material, or can be formed of a metal material or wood.

  The friction portion is exemplified by a resin (rubber, elastomer) having elasticity as a material forming the friction portion, and, for example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene) -Styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), etc. may be mentioned. It is preferable that the elastic material constituting the friction portion is not made of a highly wearable elastic material (for example, an eraser or the like), but is made of a low wear elastic material which does not generate erase dust at the time of friction. Further, the friction portion can be fixed to the stamp body by fitting, adhesion or the like, and the stamp body and the friction portion can be integrally formed of an elastic material. Alternatively, it is possible to provide a friction portion on a cap that covers the seal face of the stamp.

  Further, the external shape of the friction portion may be triangular, square, circular or elliptical. The above-mentioned external shape is the shape of the outer peripheral portion when the friction portion is viewed in plan from the other end side, and in the case of a polygonal shape such as a triangular shape or a square shape, the contact state to the paper is It becomes possible to use properly by an edge and a corner.

As the thermochromic ink, a general-purpose ink can be applied regardless of whether it is reversible or irreversible, and the color of the printed image can be changed, erased, or colored by heating the printed image by frictional heat. It can be applied selectively.
In particular, by incorporating the thermochromic composition in microcapsules, the change in the impression image can be stably expressed for a long time without causing the composition change.
As the thermochromic composition to be contained in the microcapsule pigment, from the viewpoint of repeated usability, accuracy of temperature change, etc., (i) electron donating colored organic compound, (ii) electron accepting compound, (C) A reversible thermochromic composition comprising a reaction medium which determines the temperature at which both of the color reaction take place is suitable.

Specifically, as microcapsule pigments in which the reversible thermochromic composition is contained, predetermined ones described in JP-B 51-44706, JP-B 51-44707, JP-B 1-29398, etc. Heat-discoloring before and after the temperature (color change point) of the color, decolorize in the temperature range above the color change point on the high temperature side, exhibit color development in the temperature range below the color change point on the low temperature side, Only one specific state exists, and the other state is maintained while the heat or cold required for the state to appear is applied, but if the heat or cold is not applied, the normal temperature range It is possible to apply a microcapsule pigment encapsulating a heat-discoloring type reversible thermochromic composition having a relatively small hysteresis width (ΔH = 1 to 7 ° C.), which returns to the state of
Furthermore, relatively large hysteresis characteristics (ΔH = 8 to 50 described in JP-B 4-17154, JP-A 7-179777, JP-A 7-33997, JP-A 8-39936, etc. The indication of ° C. is also applicable.

  In addition, the large hysteresis characteristics described in Japanese Patent Application Laid-Open Nos. 2005-1369, 2006-137886, 2006-188660, 2008-45062, 2008-280523, etc. In other words, the shape of the curve in which the change in coloring density due to the temperature change is plotted is the case where the temperature is lowered from the high temperature side rather than the high temperature side from the high temperature side. The color changes in a very different route, and the color development state in the low temperature range below the full color development temperature or the decoloration state in the high temperature range above the complete color removal temperature is a specific temperature range (substantially two phase holding temperature range) It is also possible to use microcapsule pigments in which a reversible thermochromic composition having a color memory property is encapsulated.

  Solvents for dispersing the microcapsules include water, glycerin, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, 1,3-butylene glycol, glycols such as ethylene glycol monomethyl ether, and lower alkyl ethers thereof, 2-pyrrolidone Appropriate amounts of N-vinyl pyrrolidone, urea and the like can be blended.

An appropriate amount of binder resin is added for the fixing property of the image, the viscosity adjustment and the like. The binder resin is selected from a resin emulsion, an alkali soluble resin, and a water soluble resin.
Examples of the resin emulsion include polyacrylic acid ester, styrene-acrylic acid copolymer, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, methacrylic acid-maleic acid copolymer, ethylene- Water dispersions such as methacrylic acid copolymer, α-olefin-maleic acid copolymer, polyester, polyurethane and the like can be mentioned, and as the alkali-soluble resin, styrene-maleic acid copolymer, ethylene-maleic acid copolymer Styrene-acrylic acid copolymer and the like can be mentioned, and as the water-soluble resin, polyvinyl alcohol, polyvinyl butyral and the like can be mentioned, and one or two or more kinds can be mixed and used.

In addition, xanthan gum, welan gum, succinoglycan (average molecular weight about 100 to 8,000,000) in which the constituent monosaccharide is an organic acid modified heteropolysaccharide of glucose and galactose, guar gum, locust bean gum and derivatives thereof, hydroxyethyl cellulose, alginic acid alkyl ester , Polymers with a molecular weight of 100,000 to 150,000 mainly composed of alkyl esters of methacrylic acid, glycomannans, thickening polysaccharides having gelling ability extracted from seaweeds such as agar and carrageenan, benzylidene sorbitol and benzylidene xylitol Or derivatives thereof, crosslinkable acrylic acid polymers, inorganic fine particles, polyglycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene castor oil, Nonionic surfactants, dialkyl or dialkenyl having an HLB value of 8 to 12, such as oxyethylene lanolin, lanolin alcohol, beeswax derivative, polyoxyethylene alkyl ether, polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, fatty acid amide, etc. Sulfosuccinic acid salts and the like can be exemplified, and they can be used alone or in combination.
Further, a compound exhibiting shear thinning property such as a mixture of N-alkyl-2-pyrrolidone and an anionic surfactant, a mixture of polyvinyl alcohol and an acrylic resin, or the like may be added to adjust the fixing property and viscosity of the impression image. it can.

In addition, pH adjusters, preservatives or fungicides can be added as required.
Examples of the pH adjuster include inorganic salts such as ammonia, sodium carbonate, sodium phosphate, sodium hydroxide and sodium acetate, and organic basic compounds such as water-soluble amine compounds such as triethanolamine and diethanolamine.
As the antiseptic agent or mildew proofing agent, there can be mentioned carboxylic acid, sodium salt of 1,2-benzisothiazolin-3-one, sodium benzoate, sodium dehydroacetate, potassium sorbate, propyl parahydroxybenzoate, 2, 3, 5, 6 -Tetrachloro -4- (methyl sulfonyl) pyridine etc. are mentioned.
In addition, it is also possible to add an antifoaming agent such as a fluorine-based surfactant or a nonionic, an anion, a cationic surfactant or dimethylpolysiloxane which improves the permeability of the solvent.

By forming a recess on the rear end face of the friction portion, the sheet member is less likely to be peeled off from the friction portion in a state in which the sheet member having the same pattern as the image obtained by the seal surface is attached. If a finger tip having a stamp is formed in contact with the inner surface of the concave portion to be formed, the stamp can be stamped in a stable posture.

  The relationship between the locking portion provided on the rear of the stamp body and the locking receiving portion provided on the cap is such that the locking portion and the locking receiving portion are engaged with each other while the cap is mounted on the stamp body. The direction of the pattern obtained can be matched with the direction of the pattern of the sheet member, for example, a method of making convex portions or concave portions at the rear of the stamp body, forming concave portions or convex portions in the cap and engaging in concavo-convex engagement, The external shape of the rear of the main body and the inner surface of the cap can be attached only in a certain direction, or a male screw is formed at the rear of the stamp main body, and a female screw is formed on the cap. There are ways to get it done.

According to the thermochromic stamp of the present invention, the thermochromic ink can be imprinted on the paper surface by the seal surface, and the thermochromic ink imprinted on the paper surface by the friction portion can be thermochromic.
Also, by making the external shape of the friction part into a polygonal shape, it is possible to make a thermal discoloration by making wide contact linearly at the edge of the friction part with the paper surface or making narrow contact at the corners of the friction part. It becomes possible to select suitably according to the size of the image.
In addition, the user applies a stamp to the rear end face of the friction portion by attaching a sheet member having a design similar to the impression obtained by the seal face, with the direction of the design of the sheet and the direction of the seal face. It is possible to recognize the directionality at the time of imprinting, and further, since the sheet member is stuck in the recess, it is difficult for the adhesive tape or the adhesive to be fixed like the silicone resin or fluorine resin in the friction portion. Even if it is a material, it becomes the structure which a sheet member does not separate easily.

FIG. 1 is a perspective view of the thermochromic stamp of the first embodiment. FIG. 2 is an end view taken along line A-A of FIG. FIG. 3 is a view of the thermochromic stamp of the first embodiment being assembled. FIG. 4 is a diagram of the next process of FIG. FIG. 5 is a view showing a state in which the thermochromic stamp of the first embodiment is stamped on the paper surface. FIG. 6 is a view showing a state in which the image on the paper surface obtained by the thermochromic ink is rubbed with the thermochromic stamp of the first embodiment. FIG. 7 is a perspective view of the thermochromic stamp of the second embodiment. FIG. 8 is an end view taken along line B-B of FIG. FIG. 9 is a view of a state in which the thermochromic stamp of the second embodiment is assembled. FIG. 10 is a diagram of the next process of FIG. FIG. 11 is a view showing a state in which the thermochromic stamp of the second embodiment is stamped on the paper surface. FIG. 12 is a view showing a state in which the image on the paper surface obtained by the thermochromic ink is rubbed with the thermochromic stamp of the second embodiment. FIG. 13 is a perspective view of the thermochromic stamp of the third embodiment. FIG. 14 is an end view taken along the line C-C of FIG. FIG. 15 is a view of a state in which the thermochromic stamp of the third embodiment is assembled. FIG. 16 is a view showing a state in which the thermochromic stamp of the third embodiment is stamped on the paper surface. FIG. 17 is a view showing a state in which the impression on the paper obtained by the thermochromic ink is rubbed with the thermochromic stamp of the third embodiment. FIG. 18 is a perspective view of the thermochromic stamp of the fourth embodiment. FIG. 19 is an end view taken along the line D-D of FIG. FIG. 20 is a view of a state in which the thermochromic stamp of the fourth embodiment is assembled. FIG. 21 is a view showing the thermochromic stamp of the fourth embodiment in a state of being sealed on the paper. FIG. 22 is a view showing a state in which the image on the paper surface obtained with the thermochromic ink is rubbed with the thermochromic stamp of the fourth embodiment.

  Hereinafter, embodiments of the thermochromic stamp in the present invention will be described with reference to the drawings. In order to make the description easy to understand, similar members in the drawings and similar portions are denoted by the same reference numerals.

  The thermochromic stamp of the first embodiment will be described using FIGS. 1 to 6. The thermochromic stamp 1 is a stamped body molded with an EVA resin (ethylene-vinyl acetate copolymer) having a stamped surface 3a at the front opening 2a of the stamp main body 2 molded in a square tube shape with PP resin (polypropylene). The rear portion 3b of 3 is fitted, and the front portion 4a of the friction body 4 molded with SEBS resin (styrene-ethylene-butadiene-styrene copolymer) is fitted into the rear opening 2b of the stamp body 2. Further, a stepped portion 2c is provided in front of the stamp body 2 to form a slightly smaller rectangular tube portion 2d, so that the rectangular tube portion 2d can be covered with the cap 5.

  The seal face 3 is formed by thermally melting and sealing the surface portion of the EVA resin having open cells, and the seal face 3a is formed so that the unsealed portion becomes the design 3c (mirror image state) of the note. The stamp board 3 is impregnated with a thermochromic ink (not shown) in which microcapsule pigments containing a thermochromic composition are dispersed in an aqueous medium. As the thermochromic ink of this example, one which is decolored by frictional heat was used. Further, a concave portion 4c is formed on the rear end surface 4b of the friction body 4, and a paper label 6 having a pattern 6a similar to the above-mentioned musical note printed on the surface of the concave portion 4c is adhered with an adhesive (not shown) Yes.

  FIG. 5 shows a state in which the thermochromic stamp 1 of the first embodiment is used for imprinting, and an imprint 101 of a musical note made of thermochromic ink impregnated in the stamp body 3 is imprinted on the sheet 100. It is. In the thermochromic stamp 1, the concave portion 4 c of the friction body 4 can be sealed by applying the belly of the finger. FIG. 6 shows the thermochromic stamp 1 according to the first embodiment in a state in which the impression 101 on the paper is abraded, and the impression 101 on the paper 100 is abraded with the friction body 4 so as to have its frictional heat In which the image 101 is erased. Since the friction body 4 of the present embodiment has a rectangular outer shape, as shown in FIG. 6, it was possible to carry out friction at a fine place using the corner 4 d.

  Next, the thermochromic stamp of the second embodiment will be described with reference to FIGS. 7 to 12. In the thermochromic stamp 11, a rectangular cylindrical connecting cylinder 20 is fitted to the front opening 12a of the stamp body 12 which is formed into a rectangular cylindrical shape by PP resin (polypropylene). The front opening 20a of the connecting cylinder 20 is fitted with the rear portion 3b of the seal 3 formed of EVA resin (ethylene-vinyl acetate copolymer) having the seal 3a. At the rear of the stamp body 12, a slightly smaller rectangular cylinder 12b is formed, and fitted into the through hole 14a formed in the friction body 14 molded with SEBS resin (styrene-ethylene-butadiene-styrene copolymer) Yes. A stepped portion 20b is provided in the middle of the connecting cylinder 20 so that the rear portion 20c of the connecting cylinder 20 can be opened forward of the stamp body 12 until the stepped portion 20b of the connecting cylinder 20 abuts on the front end of the stamp body 12. It is attached to the part 12a. Further, the cap 5 is mounted on the front portion 20d of the connecting cylinder 20 until the rear end of the cap 5 abuts on the step 20b of the connecting cylinder 20 so that the front portion 20d is covered.

  The seal face 3 is formed by thermally melting and sealing the surface portion of the EVA resin having open cells, and the seal face 3a is formed so that the unsealed portion becomes the design 3c (mirror image state) of the note. The stamp board 3 is impregnated with a thermochromic ink (not shown) in which microcapsule pigments containing a thermochromic composition are dispersed in an aqueous medium. As the thermochromic ink of this example, one which is decolored by frictional heat was used. The friction member 14 has a through hole 14a, and a paper label 6 on which a pattern 6a similar to the above-mentioned musical note is printed on the surface of the rear end 12c of the stamp body 12 through the through hole 14a It is stuck by (not shown).

  FIG. 11 shows a state in which the thermochromic stamp 11 of the second embodiment is used for imprinting, and an imprint 101 of a musical note made of thermochromic ink impregnated in the stamp body 3 is imprinted on the sheet 100. It is. In the thermochromic stamp 11, the through hole 14a of the friction body 14 can be sealed by applying the belly of a finger. FIG. 12 shows a state in which the thermochromic stamp 11 of the second embodiment is rubbing the impression 101 on the paper, and the friction 101 is used to rub the impression 101 on the paper 100 with the friction body 14. In which the image 101 is erased. Since the friction body 14 of the present embodiment has a rectangular outer shape, as shown in FIG. 12, it was possible to carry out friction at a fine place using the corner portion 14d.

  Next, the thermochromic stamp of the third embodiment will be described with reference to FIGS. 13 to 17. The thermochromic stamp 21 has a rectangular cylindrical connecting cylinder 20 fitted to the front opening 22a of the stamp main body 22 which is molded into a rectangular cylindrical shape from PP resin (polypropylene). The front opening 20a of the connecting cylinder 20 is fitted with the rear portion 3b of the seal 3 formed of EVA resin (ethylene-vinyl acetate copolymer) having the seal 3a. A stepped portion 20b is provided in the middle of the connecting cylinder 20 so that the rear portion 20c of the connecting cylinder 20 can be opened forward of the stamp body 12 until the stepped portion 20b of the connecting cylinder 20 abuts on the front end of the stamp body 12. It is attached to the part 12a. Further, the cap 25 is attached to the front portion 20d of the connecting cylinder 20 until the rear end of the cap 25 abuts on the step 20b of the connecting cylinder 20 so that the front portion 20d is covered. In a front opening 250a formed in the cap main body 250, a rear portion 24a of the friction body 24 molded with SEBS resin (styrene-ethylene-butadiene-styrene copolymer) is fitted.

  The seal face 3 is formed by thermally melting and sealing the surface portion of the EVA resin having open cells, and the seal face 3a is formed so that the unsealed portion becomes the design 3c (mirror image state) of the note. The stamp board 3 is impregnated with a thermochromic ink (not shown) in which microcapsule pigments containing a thermochromic composition are dispersed in an aqueous medium. As the thermochromic ink of this example, one which is decolored by frictional heat was used. In addition, a concave portion 24c is formed on the front end surface 24b of the friction body 24, and a paper label 6 on which a pattern 6a similar to the above-mentioned musical note is printed is adhered on the surface of the concave portion 24c with an adhesive (not shown). Yes.

  FIG. 16 shows a state in which the thermochromic stamp 21 of the third embodiment is used for imprinting, and an imprint 101 of a musical note made of thermochromic ink impregnated in the stamp body 3 is imprinted on the sheet 100. It is. In the thermochromic stamp 21, the concave portion 24 c of the friction body 24 can be sealed by applying the belly of a finger. FIG. 17 shows a state in which the thermochromic stamp 21 of the third embodiment is used to rub the impression 101 on the paper, and the impression 101 on the paper 100 is rubbed with the friction body 24 so that the heat of friction thereof is generated. In which the image 101 is erased. Since the friction body 24 of the present example has a rectangular outer shape, as shown in FIG. 17, it was possible to carry out friction at a fine place using the corner 24 d.

  Next, the thermochromic stamp of the fourth embodiment will be described with reference to FIGS. 18 to 22. FIG. The thermochromic stamp 31 has a rectangular cylindrical connecting cylinder 20 fitted to the front opening 32a of the stamp main body 32 which is molded into a rectangular cylindrical shape from PP resin (polypropylene). The front opening 20a of the connecting cylinder 20 is fitted with the rear portion 3b of the seal 3 formed of EVA resin (ethylene-vinyl acetate copolymer) having the seal 3a. A stepped portion 20c is provided in the middle of the connecting cylinder 20 so that the rear portion 20c of the connecting cylinder 20 can be opened forward of the stamp body 32 until the stepped portion 20b of the connecting cylinder 20 abuts on the front end of the stamp body 32. It is attached to the part 32a. Further, the cap 35 is mounted on the front portion 20d of the connecting cylinder 20 until the rear end of the cap 35 abuts on the step 20b of the connecting cylinder 20 so that the front portion 20d is covered. The rear portion 34a of the friction body 34 molded with SEBS resin (styrene-ethylene-butadiene-styrene copolymer) is fitted to the front opening 350a formed in the cap body 350.

  The seal face 3 is formed by thermally melting and sealing the surface portion of the EVA resin having open cells, and the seal face 3a is formed so that the unsealed portion becomes the design 3c (mirror image state) of the note. The stamp board 3 is impregnated with a thermochromic ink (not shown) in which microcapsule pigments containing a thermochromic composition are dispersed in an aqueous medium. As the thermochromic ink of this example, one which is decolored by frictional heat was used. In addition, a concave portion 34c is formed on the front end surface 34b of the friction body 34, and a paper label 6 printed with a pattern 6a similar to the above-mentioned musical note is stuck on the surface of the concave portion 34c with an adhesive (not shown). Yes.

  FIG. 21 shows a state in which the thermochromic stamp 31 of the fourth embodiment is used for imprinting, and an imprint 101 of a musical note made of thermochromic ink impregnated in the stamp body 3 is imprinted on the sheet 100. It is. In the thermochromic stamp 31, the concave portion 34c of the friction body 34 can be sealed by applying the belly of a finger. In the thermochromic stamp 31 of this embodiment, as shown in FIG. 20, a small square tube portion 32b is formed at the rear of the stamp body 32, and the cap 35 is used as the square tube portion of the stamp body 32. When mounted on 32b, the engagement convex portion 32c formed on the square cylinder portion 32b engages with the engagement concave portion 350b formed on the inside of the cap main body 350, and an image is obtained by imprinting the seal surface 3a. The direction of the arrow 101 coincides with the direction of the pattern 6a attached to the surface of the recess 34c of the friction body 34, so that the user can easily use it. FIG. 22 shows a state in which the thermochromic stamp 31 of the fourth embodiment is rubbing the impression 101 on the paper, and the friction 101 is used to rub the impression 101 on the paper 100 with the friction body 34. In which the image 101 is erased. Since the friction body 34 of the present example has a rectangular outer shape, as shown in FIG. 22, it was possible to carry out friction at a fine place using the corner 34 d.

1 ... Thermochromic stamp,
2 ... stamp body, 2a ... front opening, 2b ... rear opening,
2c: Step part, 2d: Square tube part,
3 ... Seal face, 3a ... Seal face, 3b ... Rear part, 3c ... Design,
4 friction body 4a front portion 4b rear end surface 4c concave portion
4d ... corner,
5 ... Cap,
6 ... label, 6a ... design,
100 ... paper surface, 101 ... impression image,
11 ... Thermochromic stamp,
12: Stamp main body, 12a: front opening,
12b: Square tube portion, 12c: Rear end portion,
20 ... connected cylinder, 20 a ... front opening,
20b: step portion, 20c: rear portion, 20d: front portion,
14 friction body 14a through hole 14d corner portion
21 ... Thermochromic stamp,
22: Stamp main body, 22a: front opening,
24: friction body, 24a: rear part, 24b: front end face, 24c: recess,
24d ... corner,
25 ... cap, 250 ... cap body, 250a ... front opening,
31 ... Thermochromic stamp,
32: Stamp main body, 32a: front opening,
32b: Square tube portion, 32c: Locking convex portion,
34: friction body, 34a: rear part, 34b: front end face, 34c: recess,
34d ... corner,
35: Cap, 350: Cap body, 350a: front opening,
350b: Locking recess.

Claims (3)

It has a seal surface for imprinting a thermochromic ink, and a friction portion made of an elastic material which can thermally discolor the imprint by the frictional heat by rubbing the imprint on the paper surface obtained by the thermochromic ink A thermochromic stamp,
A recess is formed in the friction portion, and a sheet member having a pattern similar to the impression obtained by the seal surface is positioned in the recess with the surface of the friction portion positioned outward from the surface of the sheet member. A thermochromic stamp characterized in that the recessed portion is in a recessed state and the sheet member is pasted so as to be surrounded by the friction portion. It has a seal surface for imprinting a thermochromic ink, and a friction portion made of an elastic material which can thermally discolor the imprint by the frictional heat by rubbing the imprint on the paper surface obtained by the thermochromic ink A thermochromic stamp,
A sheet member having a through hole formed in the friction portion, a rear side of a stamp main body having the seal surface in front is fitted in the through hole, and a sheet member having a pattern similar to an image obtained by the seal surface At the rear end of the stamp body, the surface of the friction portion is positioned outward from the surface of the sheet member, and the through hole is recessed so that the sheet member is enclosed by the friction portion. Characteristic thermochromic stamp. It has a seal surface for imprinting a thermochromic ink, and a friction portion made of an elastic material which can thermally discolor the imprint by the frictional heat by rubbing the imprint on the paper surface obtained by the thermochromic ink A thermochromic stamp,
The thermochromic stamp has a stamp body and a detachable cap on the front and back of the stamp body, the friction portion is provided on the opposite side of the opening of the cap, and the seal surface is obtained on the end face of the friction portion A seat member having a pattern similar to that of the stamped image is disposed, a locking portion is provided at the rear of the stamp body, a lock receiving portion is provided on the cap, and the cap is attached to the stamp body. A thermochromic stamp characterized in that the direction of the design obtained by pressing the seal surface and the direction of the design of the sheet member are made to coincide with each other by the engagement of the stop portion and the engagement receiving portion.

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