EP0867308B1 - Printing sheet for stamp - Google Patents
Printing sheet for stamp Download PDFInfo
- Publication number
- EP0867308B1 EP0867308B1 EP98302291A EP98302291A EP0867308B1 EP 0867308 B1 EP0867308 B1 EP 0867308B1 EP 98302291 A EP98302291 A EP 98302291A EP 98302291 A EP98302291 A EP 98302291A EP 0867308 B1 EP0867308 B1 EP 0867308B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- porous layer
- ink
- sheet
- layer
- stamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41K—STAMPS; STAMPING OR NUMBERING APPARATUS OR DEVICES
- B41K1/00—Portable hand-operated devices without means for supporting or locating the articles to be stamped, i.e. hand stamps; Inking devices or other accessories therefor
- B41K1/36—Details
- B41K1/38—Inking devices; Stamping surfaces
- B41K1/50—Stamping surfaces impregnated with ink, or made of material leaving a mark after stamping contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/055—Thermographic processes for producing printing formes, e.g. with a thermal print head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41D—APPARATUS FOR THE MECHANICAL REPRODUCTION OF PRINTING SURFACES FOR STEREOTYPE PRINTING; SHAPING ELASTIC OR DEFORMABLE MATERIAL TO FORM PRINTING SURFACES
- B41D7/00—Shaping elastic or deformable material, e.g. rubber, plastics material, to form printing surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41K—STAMPS; STAMPING OR NUMBERING APPARATUS OR DEVICES
- B41K1/00—Portable hand-operated devices without means for supporting or locating the articles to be stamped, i.e. hand stamps; Inking devices or other accessories therefor
- B41K1/34—Portable hand-operated devices without means for supporting or locating the articles to be stamped, i.e. hand stamps; Inking devices or other accessories therefor for multicolour stamping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
Definitions
- the present invention relates to a printing sheet used in a stamp.
- a user holds the stamp and forces the stamp to a media (such as a paper) so that the surface of the printing sheet is urged against the media.
- a media such as a paper
- ink impregnated in the printing sheet is permeated through the print portion of the printing sheet and transferred onto the media. Therefore, it is possible to repeatedly print images on the media for several times without supplying ink to the printing sheet.
- the printing sheet is made thin.
- the printing sheet may be swollen.
- a surface of the printing sheet may be deformed, which causes the printed image to be blurred.
- the printing sheet is made thin, an amount of ink to be impregnated in the printing sheet is relatively small. Thus, it is necessary to further provide a sponge-like member in the stamp. Accordingly, the number of parts of the stamp is increased and the producing cost thereof is also increased.
- the printing sheet is made thin, the elasticity thereof is relatively small. Accordingly, when the printing sheet is urged onto the media, a pressure distribution of the printing sheet may not be uniform. In order to solve this problem, it is necessary to further provide a cushion member in the stamp. Thus, the number of parts is increased and the producing cost thereof is also increased.
- US 5,392,711 discloses a printing sheet used in a stamp on which the pre-characterising portion of claim 1 is based.
- US 5,611,279 discloses a printing plate for a stamp which is made of a sponge having open cells.
- a printing sheet used in a stamp comprising:
- a base sheet for use as a printing sheet of a stamp comprising:
- a base sheet for use as a printing sheet of a stamp comprising:
- the printing sheet When a printing sheet of the description is used to form image, the printing sheet is mounted to a stamp.
- the user holds the stamp and forces the stamp to a media (such as a paper) so that the surface of the porous layer is urged against the surface of the media.
- Ink imppregnated at least in the porous layer permeates the printing portion of the porous layer, and is transferred onto the media. Thus, image is formed on the media.
- the fibrous layer of the description is so constructed as to prevent a deformation of the porous layer. With such an arrangement, even if the printing sheet is swollen, a surface of the printing sheet is not deformed. Thus, it is prevented that the printed image (on a media) is blurred.
- the fibrous layer of the description is so constituted that ink can be impregnated therein.
- an amount of ink to be impregnated in the printing sheet can be increased, without providing a sponge-like member or the like.
- the time required to fully impregnate ink throughout the printing sheet does not become long.
- the fibrous layer of the description has a certain elasticity. With such an arrangement, a pressure distribution of the printing sheet (when the printing sheet is urged onto the media) is uniform, even if the porous layer is relatively thin.
- the fibrous layer includes one of a non-woven fabric and a textile having raised fabrics.
- Figs. 1A and 1B are a perspective view and a sectional view of a base sheet 12 of a printing sheet of the embodiment.
- the base sheet 12 includes a porous layer 12a and a fibrous layer or deformation preventing material 12b integrally provided to the lower side of the porous layer 12a.
- the porous layer 12a is made of a porous material in which ink can be impregnate.
- the porous layer 12a is made of foamed resin such as polyolefin-based resin, polyvinyl chloride-based resin or polyurethane-based resin.
- the porous layer 12a has a certain flexibility and softness, and has an substantially uniform thickness of approximately 0.2 mm to 0.8 mm.
- the porous layer 12a contains carbon grains uniformly dispersed therein.
- the heated surface melts such that pores near the surface thereof are sealed.
- the.porous layer 12a is selectively exposed to the electromagnetic waves (such as infrared rays) according to desired image, the heated surface of the porous layer 12a becomes a non-print portion which blocks the permeation of ink, while the other portion becomes a print portion which allows the permeation of ink.
- the content of the carbon grains in the porous layer 12a is from 0.01 to 15 wt%. With such an arrangement, the porous layer 12a is gray and, when heated, turns black.
- the porous layer 12a since the carbon is greater than or equal to 0.01 wt%, the porous layer 12a is easily heated (such that the pores at the surface thereof are sealed) by a standard flash bulb.
- the fibrous layer 12b is made of a non-woven fabric that is made by adhering or entangling fibers mechanically, chemically, or thermally.
- the fibrous layer 12b is made of a felt that is made from nylon fibers, polyester fibers, or polyolefin fibers.
- the fibrous layer 12b can be made of a raised fabric that is made by raising nap on textile.
- the porous layer 12a and the fibrous layer 12b are fixed with each other in such a manner that the formed resin material (of the porous layer 12a) is entangled with the fabrics of the fibrous layer 12b. With this, the porous layer 12a and the fibrous layer 12b integrally constitute the base sheet 12.
- FIGs. 2A and 2B are a plan view and a sectional view of a stamp producing device 1 used for producing the printing sheet.
- the stamp producing device 1 includes a unit body 3 accommodating a flash bulb 6 and a tray 2 detachably provided to the unit body 3.
- Fig. 3 is a perspective view of the tray 2.
- Fig. 4 is a perspective view separately showing the unit body 3 and the tray 2.
- the tray 2 includes a tray body 2a and a transparent cover 2b swingably provided to the tray body 2a.
- a rectangular concave 2d is provided at the center portion of the tray body 2a, for placing the base sheet 12 and other two sheets (an original sheet 11 and an intermediate sheet 13) thereon.
- the transparent cover 2b is pivoted by a pin 2g disposed at one side of the tray body 2a so that the transparent cover 2b can be opened or closed.
- a lock lever 2c is provided to the side (of the tray body 2a) opposite to the pin 2g.
- the transparent cover 2b is made of a transparent acrylic resin or the like.
- the transparent cover 2b is provided with a transparent pressing portion 2e at the bottom thereof, which urges the base sheet 12, the original sheet 11 and the intermediate sheet 13 against the bottom of the concave 2d.
- a switch 9 is provided in the vicinity of an internal wall of the case 4.
- the switch 9 is urged by the tray 2 to be turned ON. Then, power is supplied (from the batteries 8) to the flash bulb 6, so that the flash bulb 6 flashes.
- FIGs. 5A, 5B and 5C are schematic views illustrating the method for producing the printing sheet.
- the original sheet 11 carrying a desired image is described.
- the original sheet 11 includes a transparent sheet 11a and a photochromic layer 11b formed on the lower surface of the transparent base sheet 11a.
- the transparent sheet 11a has substantially uniform thickness and is made of synthetic resin such as polyethylene terephthalate (PET), polyvinyl chloride, or acrylonitrile-butadiene-styrene (ABS) resin.
- PET polyethylene terephthalate
- ABS acrylonitrile-butadiene-styrene
- the melting point of the transparent sheet 11a is higher than the melting point of the base sheet 12. In particular, if the transparent sheet 11a is made of PET, the melting point thereof is approximately 230°C.
- the melting point of the base sheet 12 is approximately 120°C (in case the base sheet 12 is made of plasticized polyurethane-based resin) or approximately 70°C (in case the base sheet 12 is made of plasticized polyolefin-based resin).
- the photochromic layer 11b has substantially uniform thickness.
- a shielding portion 11c is formed on the photochromic layer 11b, according to a desired image.
- the photochromic layer 11b is formed by means of applying (or impregnating) an organic photochromic ink (manufactured by Teikoku Ink Kabushiki Kaisha) on the surface of the transparent sheet 11a.
- the photochromic layer 11b is normally colorless and transparent but turns blue and non-transparent when exposed to electromagnetic waves including ultraviolet rays.
- the photochromic layer 11b is selectively exposed to electromagnetic waves including ultraviolet rays, with a negative film placed thereon. With this, the exposed portion of the photochromic layer 11b turns blue and non-transparent.
- a shielding portion 11c is formed on the photochromic layer 11b according to desired image.
- the photochromic layer 11b has a characteristics that the photochromic layer 11b returns colorless and transparent when the photochromic layer 11b is shielded from the radiation of ultraviolet rays for a predetermined time. Therefore, the original sheet 11 can be used as a new original sheet, enabling a user to form new image thereon. The original sheet 11 can be reused many times as long as the photochromic ink is not deteriorated.
- the intermediate sheet 13 is placed between the base sheet 12 and the original sheet 11.
- the intermediate sheet 13 is transparent and its thickness is approximately 0.025 mm to 0.2 mm.
- the intermediate sheet 13 is made of PET and the melting point thereof is approximately 230°C, which is higher than that of the base sheet 12. Therefore, when the intermediate sheet 13 and the base sheet 12 are laminated and heated, and when the base sheet 12 melts due to heating, the intermediate sheet 13 does not melt.
- the tray 2 is removed from the unit body 3. Then, the transparent cover 2b of the tray 2 is opened (as shown in Fig. 3), by operating the lock lever 2c to release the engaging portion 2f. Then, the base sheet 12, the intermediate sheet 13 and the original sheet 11 are placed in the concave 2d of the tray 2. In this state, as shown in Fig. 5A, the base sheet 12 is placed so that the fibrous layer 12b is faced downward and that the intermediate sheet 13 is overlaid on the porous layer 12a of the base sheet 12. The original sheet 11 is overlaid on the intermediate sheet 13 so that the photochromic layer 11b of the original sheet 11 contacts the intermediate sheet 13.
- the transparent cover 2b is closed.
- the transparent cover 2b is locked by the engagement of the lock lever 2c and the engaging portion 2f.
- the pressing portion 2e of the transparent cover 2b urges the original sheet 11 against the base sheet 12.
- the tray 2 is inserted into the unit body 3 through the insertion opening 4a (Fig. 2B).
- the switch 9 is turned on, so that power is supplied from the batteries 8 to the flash bulb 6.
- the flash bulb irradiates electromagnetic waves including infrared rays R.
- the infrared rays R pass through the transparent cover 2b, the pressing portion 2e and the transparent sheet 11a of the original sheet 11, and irradiated on the photochromic layer 11b.
- the shielding portion 11c of the photochromic layer 11b blocks the infrared rays (R1 in Fig. 5B) and other portion of the photochromic layer 11b allows the infrared rays (R2 in Fig. 5B) to pass.
- the infrared rays passing through the photochromic layer 11b reach the porous layer 12a, which heats the porous layer 12 to cause pores thereof to melt and be sealed.
- a non-print portion 12c is formed on the porous layer 12a, which blocks the permeation of ink.
- a print portion 12d is formed on the porous resin payer 12a, which allows the permeation of ink.
- the porous layer 12a including the print portion 12d and the non-print portion 12c
- the fibrous layer 12b constitute a printing sheet 14.
- Fig. 6 is a perspective view of the printing sheet 14. The print portion 12d and the non-print portion 12c are formed on the porous layer 12a according to a desired pattern, for example, "E".
- the printing sheet 14 including a porous layer 12a carrying a pattern (the print portion 12d and the non-print portion 12c) and the fibrous layer 12b is formed by the above described process.
- the shielding portion 11c of the photochromic layer 11 is heated by the irradiation of the infrared rays, the heat is released via the intermediate sheet 13 (which is in contact with the surface of the photochromic layer 11). Thus, it is prevented that a part of the porous layer 12a which is to be the print portion 12c (corresponding to the shielding portion 11c) is unintentionally heated.
- Fig. 7 is a sectional view showing a stamp 20.
- the stamp 20 includes a handle 24 held by the user and a stamp body 21 provided to the lower end of the grip 24.
- the stamp body 21 has a recess 22 which opens at the bottom end of the stamp body 21, so that the printing sheet 14 is fit into the recess 22.
- the stamp body 21 is made of plastic, metal or the like.
- a fibrous portion 23 is provided in the upper portion of the recess 22, for holding the printing sheet 14.
- Fig. 8A is a schematically enlarged view showing the fibrous portion 23. As shown in Fig.
- the fibrous portion 23 includes a large number of fibers 23a planted on the upper wall of the recess 22 and extending downward therefrom.
- the fibers 23a are made of synthetic resin or the like.
- Each fiber 23a has hook-shaped curved portion 23b at the lower end thereof.
- Fig. 8B it is possible that each fiber 23a has an arrowhead-shaped tip.
- the handle 24 is detachably provided to the stamp body 21.
- the stamp body 21 is provided with an ink supply port 25 beneath the handle 24, extends downward to the upper wall of the recess 22.
- the ink supply port 25 is opened. In this state, the user can supply ink to the ink sheet 14 through the ink supply port 25.
- the printing sheet 14 is mounted to the recess 22 in such a manner that the non-woven fabric (or the raised fabric) of the fibrous layer 12b of the printing sheet 14 is entangled with the hook-shaped (or arrowhead-shaped) lower end of the fibers 23a of the fibrous portion 23.
- the printing sheet 14 can be mounted to the stamp body 21, by simply urging the printing sheet 14 against the fibrous portion 23.
- the user holds the handle 24 and forces the stamp 20 to a not-shown media such as a paper so that the lower surface (printing surface) of the printing sheet 14 is urged against the media.
- a not-shown media such as a paper
- ink impregnated in the fibrous layer 12b is permeated through the print portion 12c of the printing sheet 12 and transferred onto the media. Due to the elasticity of the fibrous layer 12b, a pressure distribution of the printing sheet 14 is uniform, even if the porous layer 12a is swollen.
- the printing sheet 14 can be easily removed from the recess 22 by simply peeling the printing sheet 14 from the fibrous portion 23. With this, the non-woven fabric (or the raised fabric) of the fibrous layer 12b of the printing sheet 14 is released from the fibers 23a of the fibrous portion 23. Therefore, a various kind of printing sheets 14 can be mounted to the stamp body 21, to form various kinds of images on the media.
- the fibrous layer 12b has a characteristics such that the fibrous layer 12b is not swollen even if ink is impregnated therein. Since the porous layer 12a is integrally formed with the fibrous layer 12b, the deformation of the surface of the porous layer 12a is prevented, even if the porous layer 12a is swollen.
- the amount of ink impregnated in the fibrous layer 12b is larger than that of the porous layer 12a. Thus, it is not necessary to provide a separate ink impregnating member (sponge-like mat or the like) other than the printing sheet 14. Further, since spaces between fabrics of the fibrous layer 12b is larger than pores of the porous layer 12b, the ink can be impregnated into the printing sheet 14 in a short time.
- the printing sheet 14 also has an elasticity. Due to the elasticity of the printing sheet 14, it is possible to apply a uniform pressure throughout the printing surface without providing a separate cushion member. Thus, a clear image is formed on a media.
- the flash bulb 6 is used as a heat source for melting the porous layer 12a of the base sheet 12.
- the flash bulb 6 can be replaced by a xenon tube or other light source which emits infrared rays.
- the flash bulb 6 can be replaced by a heat generator such as a thermal head.
- the original sheet 11 can be replaced by a tracing paper or other paper which allows the electromagnetic waves to pass and which carries an image with shielding ink of a desired color (such as, black, white, gold, and silver).
- the porous layer 12a of the base sheet 12 can be made of any foamed material which has flexibility when formed into a porous sheet.
- carbon grains dispersed in the porous layer 12a can be replaced by any substance which generates heat due to heating when irradiated by electromagnetic waves (for example, a high-molecular substance such as silver chloride and silver bromide, or a light energy absorbing substance).
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Printing Methods (AREA)
- Printing Plates And Materials Therefor (AREA)
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Abstract
Description
- The present invention relates to a printing sheet used in a stamp.
- As disclosed in Japanese Provisional Patent Publication Nos. 8-118771 and 8-207409, there is a type of stamp using a porous printing sheet in which ink can be impregnated. A pattern is formed on a surface of the printing sheet, including a print portion which allows the permeation of ink and a non-print portion which block the permeation of ink.
- On using the stamp, a user holds the stamp and forces the stamp to a media (such as a paper) so that the surface of the printing sheet is urged against the media. With this, ink impregnated in the printing sheet is permeated through the print portion of the printing sheet and transferred onto the media. Therefore, it is possible to repeatedly print images on the media for several times without supplying ink to the printing sheet.
- In order to reduce the cost for producing the printing sheet, the printing sheet is made thin. Thus, when ink is impregnated in the printing sheet, the printing sheet may be swollen. In such case, a surface of the printing sheet may be deformed, which causes the printed image to be blurred.
- Further, since the printing sheet is made thin, an amount of ink to be impregnated in the printing sheet is relatively small. Thus, it is necessary to further provide a sponge-like member in the stamp. Accordingly, the number of parts of the stamp is increased and the producing cost thereof is also increased. In order to increase an amount of ink to be impregnated in the printing sheet, it is alternatively possible to make the printing sheet thicker. However, since the pores of the printing sheet are generally minute, the time required to fully impregnate ink in the printing sheet becomes longer as the printing sheet becomes thicker.
- Furthermore, if the printing sheet is made thin, the elasticity thereof is relatively small. Accordingly, when the printing sheet is urged onto the media, a pressure distribution of the printing sheet may not be uniform. In order to solve this problem, it is necessary to further provide a cushion member in the stamp. Thus, the number of parts is increased and the producing cost thereof is also increased.
- US 5,392,711 discloses a printing sheet used in a stamp on which the pre-characterising portion of claim 1 is based.
- US 5,611,279 discloses a printing plate for a stamp which is made of a sponge having open cells.
- It is desirable to prevent a deformation of a surface of a printing sheet without increasing the number of parts and to make a pressure distribution of the printing sheet uniform.
- According to one aspect of the present invention, there is provided a printing sheet used in a stamp, said printing sheet comprising:
- a porous layer in which ink can be impregnated; and
- a fibrous layer made of fibres, said fibrous layer being provided to one side of said porous layer; wherein said porous layer carries a pattern on a surface thereof; said pattern including a non-print portion which blocks the permeation of ink and a print portion which allows the permeation of ink; and characterised in that the porous layer is integrally formed with said fibrous layer.
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- According to another aspect of the present invention, there is provided a base sheet for use as a printing sheet of a stamp, said base sheet comprising:
- a porous layer in which ink can be impregnated; and
- a fibrous layer made of fibres, wherein a pattern can be formed on a surface of said porous layer by heating said surface according to desired image, said pattern including a non-print portion which blocks the permeation of ink and a print portion which allows the permeation of ink; and
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- According to another aspect of the present invention there is provided a base sheet for use as a printing sheet of a stamp, said base sheet comprising:
- a porous layer in which ink can be impregnated; and
- a deformation preventing material which prevents deformation due to swell of said porous layer, wherein a pattern can be formed on a surface of said porous layer by heating said surface according to desired image, said pattern including a non-print portion which blocks the permeation of said ink and a print portion which allows the permeation of said ink; and
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- When a printing sheet of the description is used to form image, the printing sheet is mounted to a stamp. The user holds the stamp and forces the stamp to a media (such as a paper) so that the surface of the porous layer is urged against the surface of the media. Ink (impregnated at least in the porous layer) permeates the printing portion of the porous layer, and is transferred onto the media. Thus, image is formed on the media.
- The fibrous layer of the description is so constructed as to prevent a deformation of the porous layer. With such an arrangement, even if the printing sheet is swollen, a surface of the printing sheet is not deformed. Thus, it is prevented that the printed image (on a media) is blurred.
- The fibrous layer of the description is so constituted that ink can be impregnated therein. With such an arrangement, an amount of ink to be impregnated in the printing sheet can be increased, without providing a sponge-like member or the like. Further, since it is no longer necessary to make the printing sheet thicker (for increasing the amount of impregnated ink), the time required to fully impregnate ink throughout the printing sheet does not become long.
- The fibrous layer of the description has a certain elasticity. With such an arrangement, a pressure distribution of the printing sheet (when the printing sheet is urged onto the media) is uniform, even if the porous layer is relatively thin.
- Preferably, the fibrous layer includes one of a non-woven fabric and a textile having raised fabrics.
- The present invention will be more clearly understood from the following description, given by way of example only, with reference to the accompanying drawings in which:
- Figs. 1A and 1B are a perspective view and a sectional view of a base sheet of a printing sheet according to an embodiment of the present invention;
- Figs. 2A and 2B are a plan view and a sectional view of a stamp producing device for producing the printing sheet;
- Fig. 3 is a perspective view of a tray of the stamp producing device of Figs. 2A and 2B;
- Fig. 4 is a perspective view of the stamp producing device of Figs. 2A and 2B;
- Figs. 5A, 5B and 5C are sectional views illustrating the producing process of the printing sheet;
- Fig. 6 is a perspective view of the printing sheet;
- Fig. 7 is a sectional view of a stamp; and
- Figs. 8A and 8B are an enlarged sectional view of a fibrous portion of the stamp.
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- An embodiment of the present invention is described with reference to the accompanying drawings.
- Figs. 1A and 1B are a perspective view and a sectional view of a
base sheet 12 of a printing sheet of the embodiment. Thebase sheet 12 includes aporous layer 12a and a fibrous layer ordeformation preventing material 12b integrally provided to the lower side of theporous layer 12a. Theporous layer 12a is made of a porous material in which ink can be impregnate. For example, theporous layer 12a is made of foamed resin such as polyolefin-based resin, polyvinyl chloride-based resin or polyurethane-based resin. Theporous layer 12a has a certain flexibility and softness, and has an substantially uniform thickness of approximately 0.2 mm to 0.8 mm. - The
porous layer 12a contains carbon grains uniformly dispersed therein. When the surface of thebase sheet 12 is heated, the heated surface melts such that pores near the surface thereof are sealed. Thus, when the.porous layer 12a is selectively exposed to the electromagnetic waves (such as infrared rays) according to desired image, the heated surface of theporous layer 12a becomes a non-print portion which blocks the permeation of ink, while the other portion becomes a print portion which allows the permeation of ink. The content of the carbon grains in theporous layer 12a is from 0.01 to 15 wt%. With such an arrangement, theporous layer 12a is gray and, when heated, turns black. Accordingly, it can be confirmed which of various colors of ink has been impregnated in theporous layer 12a. Further, since the carbon is greater than or equal to 0.01 wt%, theporous layer 12a is easily heated (such that the pores at the surface thereof are sealed) by a standard flash bulb. - The
fibrous layer 12b is made of a non-woven fabric that is made by adhering or entangling fibers mechanically, chemically, or thermally. For example, thefibrous layer 12b is made of a felt that is made from nylon fibers, polyester fibers, or polyolefin fibers. Alternatively, thefibrous layer 12b can be made of a raised fabric that is made by raising nap on textile. Theporous layer 12a and thefibrous layer 12b are fixed with each other in such a manner that the formed resin material (of theporous layer 12a) is entangled with the fabrics of thefibrous layer 12b. With this, theporous layer 12a and thefibrous layer 12b integrally constitute thebase sheet 12. - A method for producing a printing sheet is described. Figs. 2A and 2B are a plan view and a sectional view of a stamp producing device 1 used for producing the printing sheet. The stamp producing device 1 includes a
unit body 3 accommodating aflash bulb 6 and atray 2 detachably provided to theunit body 3. - Fig. 3 is a perspective view of the
tray 2. Fig. 4 is a perspective view separately showing theunit body 3 and thetray 2. Thetray 2 includes atray body 2a and atransparent cover 2b swingably provided to thetray body 2a. A rectangular concave 2d is provided at the center portion of thetray body 2a, for placing thebase sheet 12 and other two sheets (anoriginal sheet 11 and an intermediate sheet 13) thereon. Thetransparent cover 2b is pivoted by apin 2g disposed at one side of thetray body 2a so that thetransparent cover 2b can be opened or closed. In order to lock thetransparent cover 2b in a closed state, alock lever 2c is provided to the side (of thetray body 2a) opposite to thepin 2g. An engagingportion 2f provided at the tip of thetransparent cover 2b. When thelock lever 2c is swing to an erected position (as shown in Fig. 4), thelock lever 2c holds the engagingportion 2f of thetransparent cover 2b. When thelock lever 2c is swung to a laid position (as shown in Fig. 3), thelock lever 2c releases the engagingportion 2f so that thetransparent cover 2b can be opened. Thetransparent cover 2b is made of a transparent acrylic resin or the like. Thetransparent cover 2b is provided with a transparentpressing portion 2e at the bottom thereof, which urges thebase sheet 12, theoriginal sheet 11 and theintermediate sheet 13 against the bottom of the concave 2d. - As shown in Fig. 4, the
unit body 3 includes a box-shaped case 4. Aninsertion opening 4a is formed on the lower portion of the front wall of the case 4. Thetray 2 can be inserted into theunit body 3 through theinsertion opening 4a. A truncated-pyramid-shapedchamber 6 is formed in the upper portion of the case 4. The inner surfaces of thechamber 6 is covered with a film such as aluminum foil, which has a large reflectivity. As shown in Fig. 2A, theflash bulb 6 is detachably mounted to a mountingportion 5a formed on one side wall of thechamber 6. Batteries 8 are provided in the case 4, for supplying power to theflash bulb 6. The batteries 8 are connected to theflash bulb 6 via acontact member 7 provided therebetween. A switch 9 is provided in the vicinity of an internal wall of the case 4. When thetray 2 is inserted through theinsertion opening 4a and is accommodated in theunit body 3, the switch 9 is urged by thetray 2 to be turned ON. Then, power is supplied (from the batteries 8) to theflash bulb 6, so that theflash bulb 6 flashes. - The method for producing the printing sheet is described. Figs. 5A, 5B and 5C are schematic views illustrating the method for producing the printing sheet.
- First, the
original sheet 11 carrying a desired image is described. As shown in Fig. 5A, theoriginal sheet 11 includes atransparent sheet 11a and aphotochromic layer 11b formed on the lower surface of thetransparent base sheet 11a. Thetransparent sheet 11a has substantially uniform thickness and is made of synthetic resin such as polyethylene terephthalate (PET), polyvinyl chloride, or acrylonitrile-butadiene-styrene (ABS) resin. The melting point of thetransparent sheet 11a is higher than the melting point of thebase sheet 12. In particular, if thetransparent sheet 11a is made of PET, the melting point thereof is approximately 230°C. Comparatively, the melting point of thebase sheet 12 is approximately 120°C (in case thebase sheet 12 is made of plasticized polyurethane-based resin) or approximately 70°C (in case thebase sheet 12 is made of plasticized polyolefin-based resin). Thus, when theoriginal sheet 11 and thebase sheet 12 are laminated and heated, and when thebase sheet 12 melts, theoriginal sheet 11 does not melt. - The
photochromic layer 11b has substantially uniform thickness. A shieldingportion 11c is formed on thephotochromic layer 11b, according to a desired image. - Although the shielding
portion 11c has already been formed before the producing of theprinting sheet 14, the producing process of the shieldingportion 11c is shortly described. Thephotochromic layer 11b is formed by means of applying (or impregnating) an organic photochromic ink (manufactured by Teikoku Ink Kabushiki Kaisha) on the surface of thetransparent sheet 11a. Thephotochromic layer 11b is normally colorless and transparent but turns blue and non-transparent when exposed to electromagnetic waves including ultraviolet rays. Thephotochromic layer 11b is selectively exposed to electromagnetic waves including ultraviolet rays, with a negative film placed thereon. With this, the exposed portion of thephotochromic layer 11b turns blue and non-transparent. Thus, a shieldingportion 11c is formed on thephotochromic layer 11b according to desired image. Further, thephotochromic layer 11b has a characteristics that thephotochromic layer 11b returns colorless and transparent when thephotochromic layer 11b is shielded from the radiation of ultraviolet rays for a predetermined time. Therefore, theoriginal sheet 11 can be used as a new original sheet, enabling a user to form new image thereon. Theoriginal sheet 11 can be reused many times as long as the photochromic ink is not deteriorated. - The
intermediate sheet 13 is placed between thebase sheet 12 and theoriginal sheet 11. Theintermediate sheet 13 is transparent and its thickness is approximately 0.025 mm to 0.2 mm. Theintermediate sheet 13 is made of PET and the melting point thereof is approximately 230°C, which is higher than that of thebase sheet 12. Therefore, when theintermediate sheet 13 and thebase sheet 12 are laminated and heated, and when thebase sheet 12 melts due to heating, theintermediate sheet 13 does not melt. - Before producing the printing sheet, the
tray 2 is removed from theunit body 3. Then, thetransparent cover 2b of thetray 2 is opened (as shown in Fig. 3), by operating thelock lever 2c to release the engagingportion 2f. Then, thebase sheet 12, theintermediate sheet 13 and theoriginal sheet 11 are placed in the concave 2d of thetray 2. In this state, as shown in Fig. 5A, thebase sheet 12 is placed so that thefibrous layer 12b is faced downward and that theintermediate sheet 13 is overlaid on theporous layer 12a of thebase sheet 12. Theoriginal sheet 11 is overlaid on theintermediate sheet 13 so that thephotochromic layer 11b of theoriginal sheet 11 contacts theintermediate sheet 13. - After the
base sheet 12, theintermediate sheet 13 and theoriginal sheet 11 are placed in thetray 2, thetransparent cover 2b is closed. Thetransparent cover 2b is locked by the engagement of thelock lever 2c and the engagingportion 2f. In this state, thepressing portion 2e of thetransparent cover 2b urges theoriginal sheet 11 against thebase sheet 12. Then, thetray 2 is inserted into theunit body 3 through theinsertion opening 4a (Fig. 2B). When thetray 2 is inserted into theunit body 3, the switch 9 is turned on, so that power is supplied from the batteries 8 to theflash bulb 6. With this, the flash bulb irradiates electromagnetic waves including infrared rays R. - As shown in Fig. 5B, when the
flash bulbs 6 flashes, the infrared rays R pass through thetransparent cover 2b, thepressing portion 2e and thetransparent sheet 11a of theoriginal sheet 11, and irradiated on thephotochromic layer 11b. The shieldingportion 11c of thephotochromic layer 11b blocks the infrared rays (R1 in Fig. 5B) and other portion of thephotochromic layer 11b allows the infrared rays (R2 in Fig. 5B) to pass. The infrared rays passing through thephotochromic layer 11b reach theporous layer 12a, which heats theporous layer 12 to cause pores thereof to melt and be sealed. Accordingly, anon-print portion 12c is formed on theporous layer 12a, which blocks the permeation of ink. On the other hand, since the infrared rays R1 blocked by the shieldingportion 11c do not reach theporous layer 12a, aprint portion 12d is formed on theporous resin payer 12a, which allows the permeation of ink. As shown in Fig. 5C, theporous layer 12a (including theprint portion 12d and thenon-print portion 12c) and thefibrous layer 12b constitute aprinting sheet 14. Fig. 6 is a perspective view of theprinting sheet 14. Theprint portion 12d and thenon-print portion 12c are formed on theporous layer 12a according to a desired pattern, for example, "E". - Accordingly, the
printing sheet 14 including aporous layer 12a carrying a pattern (theprint portion 12d and thenon-print portion 12c) and thefibrous layer 12b is formed by the above described process. - In the above described process, although the shielding
portion 11c of thephotochromic layer 11 is heated by the irradiation of the infrared rays, the heat is released via the intermediate sheet 13 (which is in contact with the surface of the photochromic layer 11). Thus, it is prevented that a part of theporous layer 12a which is to be theprint portion 12c (corresponding to the shieldingportion 11c) is unintentionally heated. - The structure of a
stamp 20 using theprinting sheet 14 is described. Fig. 7 is a sectional view showing astamp 20. Thestamp 20 includes ahandle 24 held by the user and astamp body 21 provided to the lower end of thegrip 24. Thestamp body 21 has arecess 22 which opens at the bottom end of thestamp body 21, so that theprinting sheet 14 is fit into therecess 22. Thestamp body 21 is made of plastic, metal or the like. Afibrous portion 23 is provided in the upper portion of therecess 22, for holding theprinting sheet 14. Fig. 8A is a schematically enlarged view showing thefibrous portion 23. As shown in Fig. 8A, thefibrous portion 23 includes a large number offibers 23a planted on the upper wall of therecess 22 and extending downward therefrom. Thefibers 23a are made of synthetic resin or the like. Eachfiber 23a has hook-shaped curved portion 23b at the lower end thereof. Alternatively, as shown in Fig. 8B, it is possible that eachfiber 23a has an arrowhead-shaped tip. - The
handle 24 is detachably provided to thestamp body 21. Thestamp body 21 is provided with anink supply port 25 beneath thehandle 24, extends downward to the upper wall of therecess 22. When thehandle 24 is detached from thestamp body 21, theink supply port 25 is opened. In this state, the user can supply ink to theink sheet 14 through theink supply port 25. - As shown in Fig. 7, the
printing sheet 14 is mounted to therecess 22 in such a manner that the non-woven fabric (or the raised fabric) of thefibrous layer 12b of theprinting sheet 14 is entangled with the hook-shaped (or arrowhead-shaped) lower end of thefibers 23a of thefibrous portion 23. Thus, theprinting sheet 14 can be mounted to thestamp body 21, by simply urging theprinting sheet 14 against thefibrous portion 23. - On using the
stamp 20, the user holds thehandle 24 and forces thestamp 20 to a not-shown media such as a paper so that the lower surface (printing surface) of theprinting sheet 14 is urged against the media. With this, ink impregnated in thefibrous layer 12b is permeated through theprint portion 12c of theprinting sheet 12 and transferred onto the media. Due to the elasticity of thefibrous layer 12b, a pressure distribution of theprinting sheet 14 is uniform, even if theporous layer 12a is swollen. - On replacing the
printing sheet 14, theprinting sheet 14 can be easily removed from therecess 22 by simply peeling theprinting sheet 14 from thefibrous portion 23. With this, the non-woven fabric (or the raised fabric) of thefibrous layer 12b of theprinting sheet 14 is released from thefibers 23a of thefibrous portion 23. Therefore, a various kind ofprinting sheets 14 can be mounted to thestamp body 21, to form various kinds of images on the media. - The
fibrous layer 12b has a characteristics such that thefibrous layer 12b is not swollen even if ink is impregnated therein. Since theporous layer 12a is integrally formed with thefibrous layer 12b, the deformation of the surface of theporous layer 12a is prevented, even if theporous layer 12a is swollen. - The amount of ink impregnated in the
fibrous layer 12b is larger than that of theporous layer 12a. Thus, it is not necessary to provide a separate ink impregnating member (sponge-like mat or the like) other than theprinting sheet 14. Further, since spaces between fabrics of thefibrous layer 12b is larger than pores of theporous layer 12b, the ink can be impregnated into theprinting sheet 14 in a short time. - Furthermore, since the
fibrous layer 12b has an elasticity, theprinting sheet 14 also has an elasticity. Due to the elasticity of theprinting sheet 14, it is possible to apply a uniform pressure throughout the printing surface without providing a separate cushion member. Thus, a clear image is formed on a media. - Although the structure of a present invention is described herein with respect to the preferred embodiment, many modifications and changes can be made without departing from the spirit and scope of the invention.
- For example, in the above-described embodiment, the
flash bulb 6 is used as a heat source for melting theporous layer 12a of thebase sheet 12. However, theflash bulb 6 can be replaced by a xenon tube or other light source which emits infrared rays. Also, theflash bulb 6 can be replaced by a heat generator such as a thermal head. - Further, the
original sheet 11 can be replaced by a tracing paper or other paper which allows the electromagnetic waves to pass and which carries an image with shielding ink of a desired color (such as, black, white, gold, and silver). Still further, theporous layer 12a of thebase sheet 12 can be made of any foamed material which has flexibility when formed into a porous sheet. Furthermore, carbon grains dispersed in theporous layer 12a can be replaced by any substance which generates heat due to heating when irradiated by electromagnetic waves (for example, a high-molecular substance such as silver chloride and silver bromide, or a light energy absorbing substance).
characterised in that the porous layer is integrally formed with said fibrous layer.
characterised in that the porous layer is integrally formed with the deformation preventing material.
Claims (13)
- A printing sheet used in a stamp, said printing sheet comprising:a porous layer (12a) in which ink can be impregnated; anda fibrous layer (12b) made of fibres, said fibrous layer being provided to one side of said porous layer;
characterised in that the porous layer is integrally formed with said fibrous layer. - A base sheet for use as a printing sheet of a stamp, said base sheet comprising:a porous layer (12a) in which ink can be impregnated; anda fibrous layer (12b) made of fibres,
characterised in that the porous layer is integrally formed with said fibrous layer. - The sheet according to claim 1 or 2, wherein said fibrous layer (12b) prevents a deformation of said porous layer (12a).
- A base sheet for use as a printing sheet of a stamp, said base sheet comprising:a porous layer (12a) in which ink can be impregnated; anda deformation preventing material (12b) which prevents a deformation due to swell of said porous layer,
characterised in that the porous layer is integrally formed with the deformation preventing material. - The sheet according to any one of claims 1 to 3
wherein the fibres of the fibrous layer are entangled with the porous layer. - The sheet according to any one of claims 1 to 3 and 5, wherein said fibrous layer (12b) is so constituted that ink can be impregnated therein.
- The sheet according to any one of claims 1 to 3, 5 and 6 wherein said fibrous layer (12b) has a certain elasticity.
- The sheet according to any one of claims 1 to 3 and 5 to 7, wherein said fibrous layer (12b) comprises one of a non-woven fabric and a textile having raised fabrics.
- The sheet according to any one of claims 1 to 3 and 5 to 8, wherein said porous layer (12a) comprises a formed resin, and
wherein said formed resin of said porous layer (12a) and said fabric of said fibrous layer (12b) entangle with each other. - The sheet according to any one of claims 1 to 3 and 5 to 9, wherein said porous layer (12a) includes a heat-generating material which generates heat when exposed to electromagnetic waves.
- The sheet according to claim 10, wherein said porous layer includes carbon grains, and said carbon grains generate heat when exposed to infrared rays.
- A stamp comprising:a stamp body; anda base sheet according to any preceding claim mounted to said stamp body for use as a printing sheet;
- The stamp according to claim 12, further comprising a fibrous portion provided to said stamp body, said fibrous layer (12b) being fixed to said fibrous portion.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9078599A JPH10272750A (en) | 1997-03-28 | 1997-03-28 | Production of manuscript sheet for plate-making |
JP78599/97 | 1997-03-28 | ||
JP7859997 | 1997-03-28 | ||
JP7966597A JPH10272823A (en) | 1997-03-31 | 1997-03-31 | Base for stamp |
JP79665/97 | 1997-03-31 | ||
JP7966597 | 1997-03-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0867308A1 EP0867308A1 (en) | 1998-09-30 |
EP0867308B1 true EP0867308B1 (en) | 2002-03-06 |
Family
ID=26419656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98302291A Expired - Lifetime EP0867308B1 (en) | 1997-03-28 | 1998-03-25 | Printing sheet for stamp |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0867308B1 (en) |
KR (1) | KR100511818B1 (en) |
AT (1) | ATE214002T1 (en) |
DE (1) | DE69804030T2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EE200000408A (en) * | 2000-10-17 | 2001-04-16 | Humal Leo-Henn | Method and apparatus for making stamps from a thermoplastic microporous material, a thermoplastic for use therein, a means for securing a release film and a stamp blank. |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06166254A (en) * | 1992-12-01 | 1994-06-14 | Kaitetsuku:Kk | Push sealing tool |
US5392711A (en) * | 1992-10-16 | 1995-02-28 | Kaitec Co., Ltd. | Method of manufacturing a printing plate |
JP2596146Y2 (en) * | 1993-01-12 | 1999-06-07 | ブラザー工業株式会社 | Printing plate |
US5611279A (en) * | 1993-10-02 | 1997-03-18 | Mitsubishi Pencil Kabushiki Kaisha | Process of producing a printing plate for a stamp |
EE03228B1 (en) * | 1995-01-24 | 1999-10-15 | As Humal Elektroonika | Method for selectively sealing pores of a surface of porous thermoplastic material |
JPH08216489A (en) * | 1995-02-10 | 1996-08-27 | General Kk | Printing plate and manufacture thereof |
-
1998
- 1998-03-25 DE DE69804030T patent/DE69804030T2/en not_active Expired - Fee Related
- 1998-03-25 AT AT98302291T patent/ATE214002T1/en not_active IP Right Cessation
- 1998-03-25 KR KR1019980010269A patent/KR100511818B1/en not_active IP Right Cessation
- 1998-03-25 EP EP98302291A patent/EP0867308B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69804030D1 (en) | 2002-04-11 |
KR100511818B1 (en) | 2006-01-27 |
EP0867308A1 (en) | 1998-09-30 |
DE69804030T2 (en) | 2002-08-14 |
ATE214002T1 (en) | 2002-03-15 |
KR19980080635A (en) | 1998-11-25 |
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