JP3829498B2 - Stamp unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a stamp unit having a printing material in which a printable effective printing surface is formed of a porous body and a holder member that holds the printing material, and in particular, the printing material surface exposed from the holder member is excluded from the effective printing surface. The present invention relates to a material that can reliably prevent ink leakage from the surface, specifically, the holder member and the periphery of the printing material along the effective printing surface.
[0002]
[Prior art]
  One of the stamp units currently proposed is related to Japanese Patent Application No. 10-52574 proposed by the present applicant. This stamp unit includes a grip (handle) member, a holder member, and a skirt member. The holder member and the grip member are coupled so that the holder member can move up and down within the skirt member, and a printing material (printing surface forming member) is held on the lower surface of the holder member by thermal bonding. In such a stamp unit, the printing material is such that a lower layer made of a soft continuous porous resin in which a light energy absorbing material such as carbon black is dispersed, ink is stored, and pressure is uniformly applied to the lower layer. It is formed in a two-layer structure consisting of an upper layer made of a hard continuous porous resin.
[0003]
  In order to make a plate of this printing material, first, while conveying a roll-shaped transparent film in a stamp manufacturing apparatus, letters and images are printed on the transparent film via a thermal head and a transfer ribbon to create a positive document, and The holder member is set in the stamp manufacturing apparatus so that the printing material is pressed in a state where the positive document and the lower layer of the printing material face each other and a transparent acrylic plate is interposed therebetween. In this state, when the xenon tube emits light, light is irradiated to the lower layer of the printing material through the positive document. As a result, only the lower layer portion irradiated with light corresponding to the transparent portion of the document is solidified after being melted by the heat generation action of the light energy absorbing material, so that the portion is sealed and does not transmit ink. Become. On the other hand, the lower layer of the portion that has not been irradiated with light and has not been melted and solidified remains as it is without being sealed in correspondence with characters of the document. As a result, a stamp is formed in which a seal portion (non-printing portion) and a non-sealing portion (printing portion) of a desired pattern are mixed on the lower surface of the printing material. A portion where the non-printing portion and the printing portion are mixed becomes an effective printing surface of the printing material. Normally, a flat surface excluding the peripheral edge along the holder member among the surface of the printing material exposed from the holder portion is an effective printing surface.
[0004]
  In addition, the holder member can store the ink pack in a storage portion having a bottom surface on which grid-like irregularities are formed, and a plate-like shape disposed at the lower end of the grip member by pressing the grip member The ink pack is opened by sandwiching the ink pack between the member and the concavo-convex bottom surface. The ink that has flowed out from the opened ink pack is stored in the upper layer and the lower layer of the printing material, and oozes only from the non-sealed portion of the effective printing surface of the lower layer, and does not ooze from the sealed portion.
[0005]
  When stamping characters or the like, the grip member is pressed downward with the skirt member of the stamp unit disposed at a desired position on the printing paper. As a result, the holder member moves downward in the skirt member, the printing material is pressure-bonded to the printing paper, and the ink is attached to the printing paper from the non-sealed portion of the effective printing surface of the printing material, thereby printing characters and the like.
[0006]
  At the time of printing, it is necessary to prevent ink from leaking from an excess portion of the printing material (exposed portion other than the effective printing surface). Accordingly, the periphery of the printing material held by the holder member is used as a seal portion from which ink does not come out, and a predetermined pattern of stamp is formed on a flat surface other than the periphery of the printing material. In addition, by projecting the stamp part that is the effective stamping surface of the stamping material and making the holder member and the periphery along the stamping part slant, the periphery of the stamping part does not touch the printing paper when the stamping material is pressed against the printing paper. It has become.
[0007]
[Problems to be solved by the invention]
  In the above-mentioned stamp unit of Japanese Patent Application No. 10-52574, when the printing material is attached to and held by the holder member, the periphery of the printing material is generally attached by thermal welding to the holder member using a welding jig. Is. Further, before and after the thermal welding, the peripheral portion along the holder portion and the effective marking surface of the surface of the printing material exposed from the holder member is heated to form a seal portion.
[0008]
  However, even if the surface of the printing material made of resin is melted by heating and the hole of the printing material is sealed, the hole is not completely closed, but only the hole is small. If pressed strongly, ink may leak and unnecessary printing may be performed. Therefore, in order to ensure sealing of the periphery of the printing material, it is necessary to perform at least one of raising the heating temperature of the printing material periphery and increasing the pressing force of the printing material periphery. Then, the density of the peripheral edge of the heated printing material increases, and a step is generated at the boundary between the flat effective marking surface and the peripheral edge that is a slope. If the level difference is large, ink leaks from the level difference. As described above, when sealing the hole of the continuous porous printing material by heating, a step is generated if the hole is surely closed, and if the step is reduced, the hole is not sufficiently closed. At the same time, it turned out that it was difficult to sufficiently close the hole.
[0009]
  Accordingly, the main object of the present invention is to ensure ink leakage from the surface of the porous printing material exposed from the holder member, excluding the effective printing surface, specifically from the periphery of the printing material along the holder member and the effective printing surface. It is to provide a stamp unit that can be prevented.
[0010]
[Means for Solving the Problems]
  The stamp unit according to claim 1, which achieves the above object, is a stamp unit having a printing material in which a printable effective marking surface is formed of a porous body, and a holder member for holding the printing material, and is exposed from the holder member. Cover the surface of the stamping material with the sealant except the effective marking surface.The sealing material has rubber elasticity in the range of −55 ° C. to + 200 ° C., and the coating thickness of the sealing material is 1.0 μm to 200 μm.It is characterized by this.
  According to this stamp unit, the seal material is applied to the unused portion of the exposed surface of the printing material, so that the hole of the unused portion of the exposed surface of the printing material is completely blocked by the sealing material, and the ink does not ooze out from there. . Further, there is no step where ink oozes out.
  In addition, when the printing material is pressed and deformed during printing, or when the periphery of the printing material is deformed into a slope, the sealing material on the surface of the printing material also follows the deformation of the printing material. Not damaged.
  Furthermore, when the coating thickness is less than 1.0 μm (0.001 mm), the sealing material is easily broken and ink leakage is likely to occur, but when it is 1.0 μm or more, the sealing material has an appropriate strength. It becomes difficult to break against external forces. When the coating thickness exceeds 200 μm (0.2 mm), a large step is generated between the portion coated with the sealing material and the effective marking surface. However, when the coating thickness is 200 μm or less, there is no practically problematic step. In addition, the range of preferable coating thickness is 30 micrometers-80 micrometers.
[0011]
[0012]
  Claims2In the stamp unit, the sealing material penetrates into the pores of the porous body.InAs described.
  According to this stamp unit, since the sealing material penetrates into the holes of the printing material, the coating material is impregnated instead of being simply covered, so that the adhesion strength of the sealing material to the printing material is improved.
[0013]
[0014]
  Claims3The stamp unit has a heat-resistant temperature of the sealing material,In hot press molding time of 0.4-5 secondsThe temperature is 180 ° C or higher.Or 2As described.
  ThisAccording to the stamp unit, the seal material does not change in quality at the temperature at which the holder member molded from polyolefin resin or the like and the stamp material molded from urethane resin etc. is deformed at the time of hot pressure, and the sealing performance is impaired. Absent.
[0015]
  Claims4In the stamp unit of claim 1, the sealing material is a syringone rubber.3It is a thing of any one of description.
  According to this stamp unit, the silicone rubber sealing material has rubber elasticity, penetrates into the fine holes of the printing material, has excellent heat resistance, excellent chemical resistance to ink, such as urethane resin that forms the printing material, etc. Since it has adhesiveness to the elastomer resin, it is optimal as a sealing material for printing materials.
[0016]
  Claims5In the stamp unit, the lower edge of the holder member and the peripheral edge of the printing material coated with the sealing material are deformed by heat pressure, the peripheral edge of the printing material is formed on a slope, and the lower edge of the holder member is It is a thing of Claim 1 currently formed in the wedge which hooks the periphery of a printing material.
  According to this stamp unit, when the lower end edge of the holder member and the peripheral edge of the printing material are deformed by heat pressure, the lower end edge of the holder member and the peripheral edge of the printing material are arranged at predetermined positions with respect to the hot press, and the peripheral edge of the printing material Is formed on the slope, and the lower end edge of the holder member is formed on a wedge that hooks the periphery of the printing material. The wedge formed in this manner is shaped like a bowl and bites into the periphery of the printing material, allowing the printing material to be firmly attached to the holder member and a seal between the printing material coated with the sealing material and the holder member. Sexually improves.
[0017]
  Claims6In the stamp unit, the printing material is a laminate of a soft porous body on which a printing plate is made and a hard porous body. Before the hot pressing, all or part of the thickness direction of the soft porous body is It protrudes from the lower end edge of the holder member, the peripheral edge of the hard porous body is formed on an inclined surface, and the thermal pressure causes the peripheral edge of the soft porous body to be deformed toward the inclined surface of the hard porous body, The lower end edge is deformed.5As described.
  According to this stamp unit, since all or part of the thickness direction of the soft porous body protrudes from the lower end edge of the holder member, the hot-pressing process first sets the periphery of the soft porous body to the inclined surface of the hard porous body. In order to push in toward it, the inclination of the periphery of a printing material is formed. Next, when the lower end edge of the holder member is deformed by hot press, the holder member is deformed so as to be wound around the peripheral edge of the soft continuous porous body, and a bowl-shaped wedge is formed.
[0018]
  Claims7In the stamp unit, a protective film is adhered to the lower end edge of the holder member by thermal welding at the same time as the thermal pressure while covering the entire printing surface of the printing material, and the protective film is made of a transparent resin film.5Or6As described.
  According to this stamp unit, a protective film that covers the entire printing surface of the printing material is thermally welded to the lower edge of the holder member, and after the stamp unit is delivered to the user during transportation of the stamp unit without using an adhesive, Thus, it is possible to protect the stamping surface of the stamping material until the plate-making process and during the stamping process.
[0019]
  Claims8The stamp unit according to claim 1, wherein the stamp material is a resin porous body in which a black light energy absorbing material is dispersed and contained, and the seal material is black or transparent.
  According to this stamp unit, when forming the seal part and the non-seal part of the effective marking surface of the stamping material by light irradiation, the surface of the stamping material coated with the sealing material also generates heat by light irradiation, and there is a hole in the resin stamping material that is softened by heat. It is heated, and the sealing with the hole sealing material becomes more reliable.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic overall exploded perspective view of a stamp unit according to the present embodiment, and FIG. 2 is a side sectional view of the stamp unit in a state where an unopened ink pack is stored in an ink pack storage portion. is there. FIG. 3 is a side sectional view of the stamp unit immediately after the ink pack in the ink pack storage portion is opened.
[0021]
  As shown in FIGS. 1 to 3, the stamp unit 1 according to the present embodiment can hold a skirt member 2 that supports the entire stamp unit 1 during stamp printing, and can be slidably held in the skirt member 2 in the vertical direction. And a holder member 4 having a printing material 3 held at its lower end by hot pressure, and fitted and connected to the holder member 4, and the printing is performed by moving the holder member 4 downward during stamp printing. A grip member 5 for pressing against a sheet (not shown) and a cap member 60 for covering and protecting the printing material 3 of the holder member 4 are provided.
[0022]
  The ink pack storage portion 22 of the holder member 4 can store an ink pack 6 in which a bag-shaped pack formed of a film material is filled with ink. The ink pack 6 is packed with an amount of ink substantially equal to the amount of ink that can be stored in the printing material 3. A thick paperboard 37 is disposed between the ink pack 6 and the bottom surface of the grip member 5. As the film material, polyethylene, polypropylene, polyester, nylon or the like is used alone or a combination of two or more of these.
[0023]
  Next, the skirt member 2 of the stamp unit 1 will be described with further reference to FIGS. 4 is a side view of the skirt member 2, FIG. 5 is an end view of the skirt member 2, and FIG. 6 is a side sectional view of the skirt member 2. In these drawings, the skirt member 2 has a substantially rectangular insertion hole 10 in plan view, and an inner wall 11 through which the holder member 4 is slidably inserted is provided in the insertion hole 10. The skirt member 2 has an upper skirt portion 13 having an outer wall 12 formed integrally with the inner wall 11 outside the inner wall 11, and an outer wall 14 formed so as to be slightly flared continuously from the outer wall 12. The lower skirt portion 15 is integrally formed.
[0024]
  A spring locking portion that locks one end of the torsion spring 16 at a position above the inner wall 11 on both end surfaces (left and right end surfaces) of the upper skirt portion 13 so as to constantly bias the holder member 4 upward in the insertion hole 10. 17 is formed. In addition, a half-moon-shaped positioning projection 18 is formed at a position obliquely below the spring locking portion 17 so that the coil portion of the torsion spring 16 is extrapolated to position the coil portion. Further, a vertical groove 19 is formed at a substantially central position of the inner wall 11 for inserting inclined protrusions 35 (described later) formed on both end faces of the holder member 4 so as to be slidable up and down. The vertical groove 19 functions to guide the inclined protrusion 35 of the holder member 4 in the vertical direction when the holder member 4 moves downward during stamp printing. Further, the movement of the torsion spring 16 in a direction away from the end face is restricted between the vertical groove 19 and the positioning protrusion 18 so that the engagement between the torsion spring 16 and the lower end of the inclined protrusion 35 is not released. For this purpose, a spring deviation suppressing member 9 having an opening (not shown) into which the torsion spring 16 is inserted is provided.
[0025]
  The lower skirt member 15 is placed on the printing paper at the time of stamp printing, and supports the entire stamp unit 1 on the printing paper. The lower skirt member 15 is provided at the lower end positions of the four corners of the outer wall 14 constituting the lower skirt member 15. A support protrusion 20 is provided to support the lower end edge of the paper 14 in a state of being separated from the paper surface of the printing paper. A downward arrow portion 21 indicating the stamp printing direction is formed at the center of the four surfaces of the outer wall 14 of the lower skirt member 15.
[0026]
  Next, the holder member 4 will be described with further reference to FIGS. 7 is a perspective view of the holder member 4, FIG. 8 is a side view of the holder member 4, FIG. 9 is a side sectional view of the holder member 4, FIG. 10 is a plan view, and FIG. In these drawings, the holder member 4 is configured integrally with an upper holder portion 30 and a lower holder portion 31 in accordance with the shapes of the upper skirt portion 13 and the lower skirt portion 15 of the skirt member 2. The upper holder part 30 has a peripheral wall 32 that forms a substantially rectangular cylindrical body in plan view, and is located above the front side wall and the rear side wall (only one of them is shown in FIG. 8). Are formed with three long hole-like concave grooves 33 aligned in the horizontal direction. Between the three concave grooves 33, wedge-shaped restricting projections 34 that are inclined outward and downward from the wall surface of the peripheral wall 32 are respectively provided. Here, a rib locking groove 54 (to be described later) of the grip member 5 is fitted in each of the concave grooves 33, whereby the holder member 4 and the grip member 5 are fixedly connected. Further, when the holder member 4 is moved downward during stamp printing, the restriction protrusion 34 abuts on the upper edge of the outer wall 12 of the upper skirt portion 13 of the skirt member 2 to restrict the downward movement amount of the holder member 4. Perform the action.
[0027]
  In addition, wedge-shaped inclined projections 35 that are inclined so as to protrude outward and downward from the wall surface of the peripheral wall 32 are provided on both end surfaces (left and right end surfaces in FIG. 8) of the peripheral wall 32 of the upper holder portion 30. When the holder member 4 is inserted from the lower side of the skirt member 2, the inclined protrusion 35 is slidably inserted in the vertical groove 19 of the upper skirt portion 13, and the lower end of the inclined protrusion 35 is also inserted. The other end of the torsion spring 16 is locked. Thus, the holder member 4 is slidable in the vertical direction within the skirt member 2 by the cooperation of the inclined protrusion 35 and the vertical groove 19, and one end of the torsion spring 16 is spring-engaged with the upper skirt portion 13. The holder member 4 is always urged upward in the skirt member 2 based on being locked to the lower end of the portion 17 and the other end being locked to the lower end of the inclined protrusion 35.
[0028]
  The ink pack storage unit 22, which is a substantially rectangular parallelepiped region surrounded by the peripheral wall 32 of the upper holder unit 30 of the holder member 4, has a flat bottom surface 23, and ink communicating with the lower holder unit 31 at the center. A supply hole 24 is provided. The ink supply hole 24 is provided with a cutting rib 25 for cutting and opening the ink pack 6 slightly protruding from the bottom surface 23.
[0029]
  On the inner wall surface of the ink pack housing portion 22, four elongated ink replenishing holes 26 extending from the upper end of the holder member 4 to the bottom surface of a support column 27 (see FIG. 11) described later are provided. The ink replenishing hole 26 is used when the user preliminarily replenishes ink without using the ink pack when the amount of ink stored in the printing material 3 supplied by the ink pack 6 decreases. At this time, the ink is injected from the ink refill hole 26 with the grip member 5 removed.
[0030]
  Moreover, as shown in FIG. 11, in the lower holder part 31 of the holder member 4, a large number of columnar support columns 27 having a length of several mm are arranged in a lattice pattern. The support column 27 extends to a position where the support column 27 is slightly retracted from the lower end of the lower holder portion 31 and comes into contact with the printing material 3 held by the holder member 4, and the bottom surface of the support column 27 is substantially one plane. Is forming. In addition, the lower holder portion 31 is formed integrally with the upper holder portion 30 and has a peripheral wall 38 that is slightly larger than the peripheral wall 32. The holder member 4 is made of any one of ABS resin, polyacetal copolymer, polyolefin resin such as polypropylene, polyethylene, and nylon, and PC resin.
[0031]
  When the grip member 5 is pressed, the cutting rib 25 sandwiches the ink pack 6 with the cardboard plate 37, and breaks and opens the ink pack 6. In order to surely open the ink pack 6, both edges of the cutting rib 25 are formed to be sharp. Further, the ink supply hole 26 guides the ink flowing out from the ink pack 6 opened by the cutting rib 25 downward, so that the ink is impregnated in the printing material 3.
[0032]
  On the outer side of the longitudinal wall of the peripheral wall 38 constituting the lower holder portion 31, an inclined groove 43 is formed in a wedge shape inwardly at a substantially central position. One or two detection grooves 44 are formed. Here, the inclined groove 43 is formed on the holder member 4 when the stamp is formed from the stamp 3 using the stamp manufacturing apparatus disclosed in the specification and drawings of Japanese Patent Application No. 9-249993 by the applicant. It is a groove for setting at a predetermined plate making position in the stamp manufacturing apparatus. At this time, since both sides of the inclined groove 43 are formed as inclined surfaces, even if the positional relationship between the positioning mechanism and the holder member 4 in the stamp manufacturing apparatus is slightly shifted, the positioning member and the inclined surface of the positioning mechanism Based on the cam action, the holder member 4 is moved so that the positioning member comes into contact with the center position of the inclined groove 43. Thus, the holder member 4 is set at a predetermined plate making position of the stamp manufacturing apparatus. Further, the number and position of the detection grooves 44 are changed according to the size of the holder member 4, and the size of the holder member 4 is specified by cooperation with a groove sensor provided in the positioning mechanism of the stamp manufacturing apparatus. Used to do. The formation positions of the inclined groove 43 and the detection groove 44 on one wall surface of the peripheral wall 38 are set so as to be rotationally symmetrical with the formation positions of the inclination groove 43 and the detection groove 44 on the other wall surface. This is because, when the holder member 4 is set at a predetermined plate-making position by the positioning mechanism of the stamp manufacturing apparatus, the printing material 3 can be made even when the front wall and the rear wall are reversed and set.
[0033]
  Further, as shown in FIG. 8, a pair of locking projections 45 is formed at a lower position in the longitudinal wall of the peripheral wall 38. The locking projection 45 is locked in a locking groove 62 of the cap member 60 described later, and is used to attach the cap member 60 to the lower end of the lower holder portion 31. Thereby, the marking surface of the marking material 3 held at the lower end of the peripheral wall 38 is protected by the cap member 60.
[0034]
  Next, the grip member 5 will be described with further reference to FIGS. 12 is a side view of the grip member 5, FIG. 13 is a bottom view of the grip member 5, and FIG. 12 is a cross-sectional view of the grip member 5 in the width direction.
[0035]
  In these drawings, a label affixing portion 50 for affixing a label or the like for displaying the stamp content formed on the stamp 3 as described above is formed on the upper surface of the grip member 5. Moreover, in the inside of the grip member 5, from the lower surface of the upper wall, as shown in FIGS. 2, 13, and 14, an insertion portion 51 to be inserted into the peripheral wall 32 of the upper holder portion 30 of the holder member 4. Is formed. The insertion portion 51 performs an action of pressing the ink pack 6 disposed in the holder member 4 via the cardboard plate 37.
[0036]
  Further, as shown in FIG. 13, the insertion portion 51 basically has a rectangular shape in a bottom view, and four concave portions 52 are formed at positions facing each other at both side positions. The recess 52 is provided at a position corresponding to the ink replenishing hole 26 formed along the peripheral wall 32 when the insertion portion 51 of the grip member 5 is inserted into the peripheral wall 32 of the holder member 4. It should be noted that the two pairs of the recesses 52 are formed regardless of the state in which the wall portion of the ink replenishing hole 26 is inserted regardless of the state in which the insertion portion 51 of the grip member 5 is inserted into the peripheral wall 32. This is so as not to hinder. A plurality (12 in FIG. 13) of ribs 53 are formed on the inner wall surface of the grip member 5 in the vertical direction. Further, among the ribs 53, the rib locking groove 54 is integrally formed in the vicinity of the lower end of the rib 53 that is inside the long side of the rectangle. The rib locking groove 54 is fitted into each concave groove 33 formed in the upper part of the outer surface of the peripheral wall 32, whereby the holder member 4 and the grip member 5 are integrally connected. . Moreover, the step part 55 is formed in the inside of the rectangular short side among each rib 53. FIG. When the holder member 4 is slid downward in the skirt member 2 to the extent that printing with the printing material 3 is possible, the stepped portion 55 is the upper end of the short side of the inner wall 11 that forms the rectangular insertion hole 10 of the skirt member 2. At this time, the holder member 4 is not slid beyond a sufficient level for printing.
[0037]
  Next, the cap member 60 attached to the lower end portion of the lower holder portion 31 of the holder member 4 will be described with further reference to FIGS. 15 and 16. FIG. 15 is a side view of the cap member 60, and FIG. 16 is a side sectional view of the cap member 60. In each figure, the cap member 60 has a box shape with the upper part opened, and when the cap member 60 is attached to the holder member 4 as shown in FIG. A grasping portion 61 is formed which is grasped by a finger when removed. A pair of locking grooves 62 for locking a pair of locking projections 45 formed on the peripheral wall 38 are provided on both inner wall surfaces of the cap member 60. Each locking groove 62 of the cap member 60 is locked to each locking projection 45 of the peripheral wall 38, whereby the cap member 60 is attached to the peripheral wall 38, and is thereby held at the lower end of the peripheral wall 38 via the cap member 60. The stamped surface of the stamped material 3 is protected.
[0038]
  In FIG. 1 to FIG. 3, the printing material 3 held at the lower end of the holder member 4 includes an upper layer 71 made of a hard porous resin having a thickness of 3 mm, for example, polyvinyl formal having a porosity of about 90%, and an upper layer 71. An intermediate layer 72, which is a hard porous resin having a thickness of 2 mm, made of the same material as above, and a soft porous resin, which is a urethane-based resin having a porosity of about 65%, in which a black light energy absorbing material such as carbon black is dispersed It is formed in a three-layer structure with a lower layer 73 made of Although the intermediate layer 72 and the lower layer 73 are fixed to each other by an adhesive applied in a lattice point shape, the upper layer 71 and the intermediate layer 72 are in a free state where they are not artificially bonded.
[0039]
  The upper layer 71 is provided with a plurality of through-holes 74 having a circular cross section having a diameter of 1 to 2 mm (in FIG. 1 and FIG. 19, only one is given a reference numeral and the other is omitted). That is, when the upper layer 71 and the intermediate layer 72 are considered as one hard porous resin layer, the hard porous resin layer is provided with a recess that does not reach the lower layer 73. Since the through hole 74 is provided in the upper layer 71 of the three-layer printing material 3, the ink supplied from the ink supply hole 24 and spreading on the upper layer 71 reaches the intermediate layer 72 immediately through the through hole 74. To do. The ink that has reached the intermediate layer 72 slowly permeates the intermediate layer 72 and reaches the lower layer 73. Therefore, even when the printing material 3 has a three-layer structure and the total thickness of the hard porous resin layer is large as in the present embodiment, the ink reaches the lower layer 73 that is a soft porous resin layer. The time until is almost the same as when the total thickness of the hard porous resin layer is relatively small with a two-layer structure. Therefore, according to the stamp unit 1 of the present embodiment, the ink storage amount in the printing material 3 is increased so that, for example, stamp printing can be performed 5,000 to 10,000 times, and the lower layer 73 is transferred from when the ink pack is opened. It is possible to greatly reduce the time required until the ink reaches (that is, when stamp printing is possible).
[0040]
  In FIG. 2, the peripheral edge of the lower layer 73 of the printing material 3 and the lower edge of the holder member 4 are deformed by heat pressure, the peripheral edge of the lower layer 73 is formed on the slope, and the lower edge of the holder member 4 is lower. The side layer 73 is crushed and sealed so as to be hooked on the peripheral edge. Further, the inclined peripheral edge of the lower layer 73 of the printing material 3 has pores closed with a sealing material 85 so that ink does not leak. Accordingly, a stamp as an effective stamp surface 86 is formed in a portion excluding the portion where the seal material 85 is applied on the periphery of the lower layer 73 of the stamp material.
[0041]
  The details of the thermal pressure between the peripheral edge of the lower layer 73 applied with the sealing material 85 and the lower edge of the holder member 4 will be described with reference to FIGS. FIG. 17 is a perspective view of the holder member 4 that holds the stamp material 3. FIG. 18 is a perspective view showing an application state of the sealing material 85 of the lower layer 73 of the printing material before hot pressing. FIG. 19 is a perspective view showing an assembled state of the holder member 4 and the stamp material 3 during hot pressing. FIG. 20 is a diagram illustrating a hot pressing process of the holder member 4 and the stamp material 3.
[0042]
  In FIG. 17, only the lower layer 73 of the stamp 3 is exposed from the crushed lower end edge 4 a of the holder member 4. The periphery of the lower layer 73 along the lower end edge 4a is formed on a slope 83 that protrudes from the crushed lower end edge 4a. A sealing material 85 is applied to the slope 83. The lower layer 73 of the printing material 3 corresponding to the flat central portion surrounded by the sealing material 85 becomes the effective printing surface 86. A stamp in which a seal portion (non-printing portion) and a non-sealing portion (printing portion) of a desired pattern are mixed is formed on the portion of the effective stamp surface 86. In the case where the effective marking surface 86 is divided into flat central portions, the sealing material 85 can be applied to the portion corresponding to the dividing line. Moreover, the sealing material 85 can also be apply | coated to the circumference | surroundings of the part covered with the holder member 4 among the lower layers 73 of the stamp material 3. FIG. In short, it is only necessary to cover the entire surface of the printing material 3 exposed from the holder member 4 except the effective printing surface 86 with the sealing material 85.
[0043]
  A material that satisfies the following characteristics is used for the sealing material 85. First, it is necessary to be able to adhere to a soft continuous porous resin material that forms the lower layer 73 of the stamp 3, for example, an elastomer resin such as a urethane resin. Next, there is a demand for chemical resistance that does not erode even when in contact with ink. Further, it is required to have a viscosity and a particle size that can penetrate into the pores of the soft continuous porous resin material that forms the lower layer 73 of the stamp 3, for example, 20 ± 10 μm pores, before curing. Further, since the hot pressing is performed while the sealing material 85 is applied, the heat resistance is such that it does not change in a short time during the hot pressing at 200 ° C. to 240 ° C., specifically 180 ° C. or more. It is required to have durable heat resistance. Further, since the lower layer 73 of the stamp 3 is elastically deformed by hot-pressure deformation so that the periphery of the lower layer 73 becomes the inclined surface 83, the applied sealing material is also required to have rubber elasticity. This rubber elasticity is preferably maintained in a wide range of −55 ° C. to + 200 ° C. Silicone rubber is used as the sealing material 85 that satisfies all such characteristics. This silicone rubber can be classified into a liquid silicone rubber that cures into a rubber-like shape at room temperature by a condensation reaction, and this liquid silicone rubber cures while reacting with moisture in the air.
[0044]
  As shown in FIG. 18, a sealing material 85 is applied and cured in advance around one side of the lower layer 73 of the printing material 3. The coating thickness of the sealing material 85 is preferably 1.0 μm to 200 μm. More preferably, it is 30 micrometers-80 micrometers. If the thickness of the sealing material 85 is thin, the sealing material 85 is easily broken by an external force. However, if the thickness is equal to or greater than the specified value, the sealing material 85 has an appropriate strength and is not easily broken by an external force. Further, when the thickness is not more than the specified value, the extent of protruding from the effective stamp surface 86 does not become an obstacle to stamp printing. When liquid silicone rubber is used as the sealing material 85, the liquid rubber penetrates into the continuous holes of the lower layer 73 of the marking material 3 and usually has a diameter of 20 ± 10 μm, and is cured in the permeated state. Therefore, the sealing material 85 is not only covered on the surface of the lower layer 73 of the printing material 3 but is in an impregnated state. As a result, the sealing material 85 is firmly applied to the surface of the lower layer 73 of the printing material 3 by both coating and impregnation, and does not easily peel off. The sealing material 85 can also be applied to the side surface around the lower layer 73.
[0045]
  As shown in FIG. 19, the hot pressing jig 76 is formed in a cylindrical shape having a rectangular shape in plan view, and the heating control is performed by a heating control device (not shown). Here, the heating temperature (deformation temperature) of the hot pressing jig 76 is set in a range of 200 ° C to 240 ° C. The hot-pressing jig 76 has a hot-pressing area 77 based on its shape.
[0046]
  The protective film 78 is comprised from the transparent resin film, for example, is formed from resin, such as PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and polyamide. A silicon-based resin film or a fluorine-based resin film is formed on the entire surface of the protective film 78 or on the surface facing the hot-pressing jig 76 by a surface treatment with a silicon-based or fluorine-based resin. The melting temperature of the resin component constituting the protective film 78 is lower than the hot pressure temperature of the welding jig 76 and higher than the melting temperature of the resin component contained in the holder member 4 or the stamp material 3. Yes. A thermocompression allowance 79 is formed on the protective film 78 corresponding to the hot pressure area 77 of the hot pressure jig 76. The thermocompression allowance 79 includes two parts, and the inner thermocompression allowance 79b corresponds to a part where the lower layer 73 of the printing material 3 and the inner side of the lower end edge 4a of the holder member 4 are welded. The thermocompression allowance 79 a corresponds to the width after crimping of the lower end edge 4 a of the holder member 4. A grip 80 is formed outside the thermocompression allowance 79 in the protective film 78.
[0047]
  Although the printing material 3 is upside down from the time of stamp printing, it is composed of a lower layer 73, an intermediate layer 72, and an upper layer 71 in order from the top. As described above, the lower layer 73 is made of a soft porous resin that is a urethane-based resin having a porosity of about 65% in which a light energy absorbing material such as carbon black is dispersed. It has been applied. The intermediate layer 72 and the upper layer 71 are made of, for example, a hard porous resin having a thickness of 3 mm, which is polyvinyl formal having a porosity of about 90%. The holder member 4 is also turned upside down from the time of stamp printing and is arranged with the lower holder portion 31 facing upward, and therefore the lower end edge 4a is positioned upward. The upper layer 71 is pushed into the inner space 4b of the lower edge 4a until it hits the support column 27. The rounded inclined surface 71a at the periphery of the upper layer 71 faces the support column 27 side, that is, the ink replenishment side. The intermediate layer 72 is further pushed into the inner space 4 b until it hits the upper layer 71. The rounded inclined surface 72 a at the periphery of the intermediate layer 72 faces the direction facing the lower layer 73. The lower layer 73 has a plate shape with a flat periphery, and is bonded to the intermediate layer 72 with a dotted adhesive.
[0048]
  The lower edge portion 4 a of the holder member 4 is thinner than the distal end portion 38 a of the peripheral wall 38 of the lower holder portion 31. However, the inner space 4b side is continuous. The degree of thinness of the lower edge portion 4a is selected so as to be deformed when hot pressed and substantially equal to the thickness of the tip end portion 38a.
[0049]
  In the above configuration, in order to heat-press the lower end edge 4a of the holder member 4 and the peripheral edge of the printing material 3, first, as shown in FIG. 20 (A), the printing material 3 is placed in the inner space 4b of the holder member 4 in the upper layer 71, The intermediate layer 72 and the lower layer 73 are arranged in this order. At this time, the entire lower layer 73 protrudes from the lower end portion 4 a of the holder member 4. The lower layer 73 may partially enter the inner space 4 b of the holder member 4. In this state, the inclined surface 72a of the intermediate layer 72 faces the lower layer 73, and a space 81 is formed therebetween. This space 81 provides a space for flowing in when the peripheral edge of the lower layer 73 is deformed by heat pressure.
[0050]
  After that, as shown in FIG. 20B, a protective film 78 is placed so as to cover the marking surface of the lower layer 73 of the marking material 3. While maintaining this state, the hot-pressure jig 76 heated to a predetermined temperature is moved downward, and the hot-pressure jig 76 is pressed downward. In this state, a predetermined time (0.4 to 5 seconds, desirably Hold for 2 seconds). Thereby, the periphery of the lower layer 73 of the stamp 3 flows into the space 81, and the lower end edge 4a of the holder member 4 is deformed as shown. Since the wall of the inner space 4b of the holder member 4 is straight, the lower end edge 4a is easily deformed toward the inner space 4b. As shown in the drawing, a hook-like wedge 82 is formed which bites into the periphery of the deformed lower layer 73 and hooks it. The wedge 82 is in a state of hooking the peripheral edge to which the sealing material 85 of the lower layer 73 of the printing material 3 is applied while maintaining the sealable close contact state. The side opposite to the wedge 82 of the lower end edge 4 a of the holder member 4 is deformed so as to be caught by the distal end portion 38 a of the peripheral wall of the holder member 4.
[0051]
  In addition, due to the deformation of the lower edge 4a of the holder member 4 and particularly the peripheral edge of the lower layer 73 of the printing material 3, a slope 83 is formed on which the sealing material 85 on the peripheral edge of the printing material is applied simultaneously. Therefore, the hot pressing jig 76 has a shape having an inner thermocompression bonding margin 79b, and the inner side of the hot pressing jig 76 has a rounded slope. Further, since the protective film 78 is interposed, the slope 83 on the periphery of the printing material has a smooth slope without a step. At the same time, the protective film 78 and the deformed flat portion of the lower end edge 4a of the holder member 4 are welded in a peelable state. As described above, the printing material 3, the holder member 4, and the protective film 78 are simultaneously hot-pressed through the hot-pressure jig 76.
[0052]
  In this way, the lower end portion 4a of the holder member 4 and the lower layer 73 of the printing material 3 are in a state of being hooked with each other while maintaining a close contact state that can be sealed by the hook-shaped wedge 82, and at the time of stamp printing. The seal against the ink at the periphery of the printing material 3 to the holder member 4 is ensured. In order to effectively perform this hot-pressure deformation, the lower end edge 4a of the holder member 4 is thin, the inner peripheral side is straight, the rounded inclined surface of the peripheral edge of the intermediate layer 72 of the printing material, and the entire printing material 3 A support column 27 that holds the periphery of the support column 27 is effective. Since the lower end edge 4a of the holder member 4 becomes a hook-like wedge and hooks the periphery of the lower layer 73 of the printing material 3, the lower end edge 4a of the holder member 4 remains under the printing material 3 even after repeated stamp printing. Since the state in which the periphery of the side layer 73 is held in a sealable state with the sealing material 85 applied is maintained, the reliability of the seal is greatly improved.
[0053]
  Here, the holder member 4, the printing material 3, and the protective film 78 each contain a resin component, and the melting temperature of the resin component contained in the protective film 78 is the melting temperature of the resin component contained in the holder member 4 and the printing material 3. Since the temperature is higher than the temperature, the resin component contained in the protective film 78 is not strongly pressed against the lower edge 4a of the holder member 4 based on the high melting temperature, and stamp printing is performed. When performing, the protective film 78 can be easily peeled off from the holder member 4. In addition, since a silicon-based or fluorine-based resin film is formed on the surface of the protective film 78 facing the hot-pressing jig 76, the protective film 78 is not attached to the hot-pressing jig 76 during hot press. Absent. In particular, it is effective when hot pressing is performed at a temperature close to the melting temperature of the protective film 78.
[0054]
  Next, an example of a process for forming a stamp that can be printed on a printing material will be described below. First, the holder member 4 is set at a predetermined plate making position of a stamp manufacturing apparatus (not shown). At this time, based on the cam action of the inclined surface of the inclined groove 43 formed in the lower holder portion 31 and the positioning member of the positioning mechanism, the holder member 4 is set at a predetermined plate making position of the stamp manufacturing apparatus. Further, the size of the holder member 4 is specified by the cooperation of each detection groove 44 and the groove sensor provided in the positioning mechanism.
[0055]
  Then, while conveying the roll-shaped transparent film in the stamp manufacturing apparatus, characters and images are printed on the transparent film via the thermal head and the transfer ribbon to create a positive document. Further, the holder member 4 is set with a transparent acrylic plate interposed between the positive document and the lower layer of the printing material 3 so as to face each other. When the xenon tube is caused to emit light in this state, light is irradiated to the lower layer 73 of the printing material 3 through the positive document. As a result, only a part of the lower layer 73 irradiated with light corresponding to the transparent portion of the original is melted by the heat generating action of the black light absorbing material and then solidified and sealed. On the other hand, the lower layer 73 of the portion of the printing material 3 that has not been melted and solidified remains in correspondence with the characters of the original document. As a result, a stamp having an effective stamping surface in which a seal portion and a non-seal portion are mixed is formed on the lower surface of the stamp material 3. Further, a sealing material 85 is applied to the periphery of the lower layer 73 of the stamping material 3, and since the sealing material 85 is black, the portion of the sealing material 85 also generates heat. Due to the heat generated by the sealing material 85, the adhesion between the printing material 3 and the sealing material 85 becomes stronger. Even when the sealing material 85 is transparent, the portion of the printing material 3 to which the sealing material 85 is applied generates heat. Due to the heat generation of the printing material 3, the adhesion between the printing material 3 and the sealing material 85 becomes stronger.
[0056]
  Next, the assembly procedure of the stamp unit after completion of the plate making of the stamp 3 will be described below. On both end surfaces of the upper skirt portion 13, the coil portion of the torsion spring 16 is previously positioned by the positioning projection 18, and one end of the torsion spring 16 is locked by the spring locking portion 17. In 10, the holder member 4 is inserted from below. At this time, the inclined protrusions 35 formed on both end surfaces of the peripheral wall 32 of the upper holder portion 30 in the holder member 4 are slid upward in the vertical groove 19 of the skirt member 2, and the inclined protrusions 35 are wedge-shaped. Accordingly, when the other end of the torsion spring 16 is overcome, the other end of the torsion spring 16 is locked to the lower end of each inclined protrusion 35. In this state, the holder member 4 is urged upward in the skirt member 2 by the urging force of the torsion spring 16, and the holder member 4 can slide downward against the urging force of the torsion spring 16. Become.
[0057]
  After assembling the holder member 4 and the skirt member 2 as described above, the ink pack 6 is stored in the ink pack storage portion 22 and the cardboard 37 is disposed on the ink pack 6, and then the grip member 5 is inserted. The fitting portion 51 is inserted into the peripheral wall 32 of the holder member 4 (state shown in FIG. 2). As described above, when the grip member 5 is further pressed with the insertion portion 51 inserted into the peripheral wall 32, the ink pack 6 in the holder member 4 is pinched between the cardboard plate 37 and the cutting rib 25. To go. At this time, the pressing force exerted on the ink pack 6 is exerted substantially uniformly on the ink pack 6 based on the action of the cardboard plate 37. Accordingly, the ink pack 6 is broken and opened at the portion where it comes into contact with the cutting rib 25, so that the ink pack 6 is opened at a substantially central position corresponding to the position where the cutting rib 25 is formed, and flows out of the ink pack 6. The ink can be dispersed substantially uniformly around the cutting rib 25. Further, since the cardboard plate 37 has an ink absorption capability, as described above, when the ink pack 6 is opened in the holder member 4 by moving the grip member 5 downward, It is possible to prevent ink leaking out of the stamp unit 1 by absorbing ink that has flowed out to the upper side.
[0058]
  Further, when the ink pack 6 is opened through the cutting rib 25, the ink flows out at once, but the space formed between the peripheral wall 32 and the cutting rib 25 flows out of the ink pack 6. Since it serves as an ink storage portion, it is possible to prevent the ink from leaking out of the holder member 4 even when the ink flows out at once when the ink pack 6 is opened.
[0059]
  The ink that has flowed out of the ink pack 6 is guided downward from the ink supply holes 24 formed around the cutting ribs 25 and temporarily accumulates on the printing material 3 (the state shown in FIG. 3). The printing material 3 is quickly impregnated by the action of. At this time, the ink supply holes 24 are formed around the cutting ribs 25, and support pillars 27 that are separated from each other are provided below the ink supply holes 24, so that the ink from the ink pack 6 is supplied to the printing material 3. It can be impregnated uniformly throughout.
[0060]
  When the ink pack 6 is opened by moving the grip member 5 downward as described above, the rib locking grooves 54 formed at the lower ends of the ribs 53 of the grip member 5 are the peripheral walls of the holder member 4. The holder member 4 and the grip member 5 are integrally connected to each other by being fitted into the respective concave portions 33 formed in the reference numeral 32. Therefore, when the stamp material 3 is impregnated with ink as described above and then stamp printing of characters or the like is performed according to the stamp formed on the stamp material 3, the grip member 5 and the holder member 4 move together. More stamp printing is possible. Even when the stamp printing is repeated many times, the sealing performance that prevents ink leakage is maintained by the rubber elastic sealing material 85 at the periphery of the printing material 3.
[0061]
  Further, when the ink impregnated in the printing material 3 is reduced and it becomes impossible to perform stamp printing at an appropriate concentration, the grip member 5 is removed from the holder member 4, and the thick paperboard 37 and the ink pack in which the ink is used up are removed. 6 is removed from the holder member 4, and a new ink pack 6 filled with ink is placed in the holder 4 and the same operation as described above is performed, whereby stamp printing can be resumed. It is also possible to restart stamp printing by replenishing ink from the ink replenishing hole 26 formed in the inner wall surface of the peripheral wall 32 of the holder member 4 without removing the ink pack 6 and the thick paperboard 37.
[0062]
  In addition, this invention is not limited to the said embodiment, Of course, various improvement and deformation | transformation are possible within the range which does not deviate from the summary of this invention.
[0063]
  For example, in FIG. 21, which is a cross-sectional view of the main part of a stamp unit according to another embodiment of the present invention, the stamp unit is composed of a stamp material 103 and a holder member 104. Further, the stamp material 103 has a two-layer structure of a soft porous body 173 and a hard porous body 171, and a sealing material 185 is applied to both the peripheral edge and the peripheral side surface of the soft porous body 173. Both the soft porous body 173 and the hard porous body 171 are fitted into the inner space of the holder member 104 to constitute a stamp unit. Since the thickness of the sealing material 103 is thin, there is no practical problem even if the periphery of the soft porous body 173 is not inclined.
[0064]
  Further, in FIG. 22 which is a cross-sectional view of the main part of a stamp unit according to still another embodiment of the present invention, the printing material 203 is made of a hard porous body and further protrudes from the folded portion 204a of the holder member 204. It has a printable part. The stamp unit may be configured such that the seal member 285 is applied to the periphery of the stamp member 203 and the seal member 285 is sandwiched together with the seal member 285 by the folded portion 204 a of the holder member 204.
[0065]
【The invention's effect】
  According to the stamp unit of claim 1, since it is not completely crushed only by crushing the holes on the surface except for the effective surface, there is a possibility that the ink oozes out at the time of one pressing and unnecessary printing is performed. In the case of covering with the sealing material, the holes are completely blocked and the ink does not bleed out, and good printing can be maintained. The coating layer by the sealing material can be formed easily and reliably. Further, there is no step where ink oozes out.Furthermore, even if printing is repeated many times, the sealing material follows the deformation of the printing material, the sealing performance is maintained for a long time, and the durability is improved. In addition, the coating thickness is within a predetermined appropriate range, the strength of the sealing material is kept moderate, the sealing material is difficult to tear, and the surface of the printing material There is no step which is a practical problem.
[0066]
[0067]
  Claim2According to the stamp unit, when the sealing material penetrates into the holes, the adhesion strength of the sealing material to the surface of the printing material is increased, and the durability is improved.
[0068]
[0069]
  Claim3According to the stamp unit, the sealing material does not change in quality when the printing material is attached to the holder material by heat pressure.
[0070]
  Claim4According to the stamp unit, the sealing material is excellent in chemical resistance to ink and has adhesiveness to the elastomer resin forming the printing material, and functions optimally as a sealing material to the printing material.
[0071]
  Claim5According to the stamp unit, the peripheral edge of the printing material is firmly hooked on the wedge at the lower edge of the holder member. Therefore, even if printing is repeated a number of times, the peripheral edge of the printing material is detached from the holder member or a gap is formed. Does not leak.
[0072]
  Claim6According to this stamp unit, the periphery of the soft porous body is deformed first, enters the inclined surface of the periphery of the hard porous body, and then the lower edge of the holder member is deformed to form a wedge while winding the periphery of the hard porous body Therefore, the peripheral edge of the printing material caught on the wedge at the lower end edge of the holder member can be reliably formed.
[0073]
  Claim7According to the stamp unit, since the protective film is adhered at the same time as the hot-pressure deformation, it is possible to protect the printing material until immediately before stamp printing.
[0074]
  Claim8According to this stamp unit, when forming the seal portion and the non-seal portion of the stamp surface of the stamp material by light irradiation, the seal member portion also generates heat by the light irradiation, and the surface of the stamp material other than the effective stamp surface, for example, the peripheral edge along the holder member The hole of the printing material is securely sealed.
[Brief description of the drawings]
FIG. 1 is an overall exploded perspective view of a stamp unit according to an embodiment of the present invention.
FIG. 2 is a side sectional view of the stamp unit of FIG. 1 when an ink pack is not opened.
3 is a side sectional view of the stamp unit of FIG. 1 immediately after opening an ink pack.
4 is a side view of the skirt member shown in FIG. 1. FIG.
FIG. 5 is an end view of the skirt member shown in FIG. 1;
6 is a side sectional view of the skirt member shown in FIG. 1. FIG.
7 is a perspective view of the holder member shown in FIG. 1. FIG.
FIG. 8 is a side view of the holder member shown in FIG. 1;
FIG. 9 is a side sectional view of the holder member shown in FIG. 1;
10 is a plan view of the holder member shown in FIG. 1. FIG.
11 is a bottom view of the holder member shown in FIG. 1. FIG.
12 is a side view of the grip member shown in FIG. 1; FIG.
13 is a bottom view of the grip member shown in FIG. 1. FIG.
14 is a sectional view of the grip member shown in FIG. 1. FIG.
FIG. 15 is a side view of the cap member shown in FIG. 1;
FIG. 16 is a side sectional view of the cap member shown in FIG. 1;
FIG. 17 is a perspective view of a holder member that holds a printing material.
FIG. 18 is a perspective view showing an application state of a sealing material in a lower layer of a printing material before hot pressing.
FIG. 19 is a perspective view showing an assembled state of the holder member and the printing material during hot pressing.
FIG. 20 is a diagram illustrating a hot pressing process between a holder member and a printing material.
FIG. 21 is a sectional view of an essential part of a stamp unit according to another embodiment of the present invention.
FIG. 22 is a cross-sectional view of a main part of a stamp unit according to still another embodiment of the present invention.
[Explanation of symbols]
1 Stamp unit
2 Skirt member
3 Stamping material
4 Holder member
4a Lower end
5 Grip member
71 Upper layer (rigid porous body)
72 Intermediate layer (rigid porous body)
73 Lower layer (soft porous body)
72a Inclined surface
82 wedges
84 Mask
85 Sealing material
86 Effective seal

Claims (8)

In a stamp unit having a printing material in which a printable effective printing surface is formed of a porous body and a holder member for holding the printing material, a surface of the printing material exposed from the holder member excluding the effective printing surface is a sealing material. in coated,
The sealing material has rubber elasticity in a range of −55 ° C. to + 200 ° C.,
The sealing unit has a coating thickness of 1.0 μm to 200 μm . The stamp unit according to claim 1 , wherein the sealing material penetrates into the pores of the porous body. The stamp unit according to claim 1 or 2, wherein the heat resistant temperature of the sealing material is 180 ° C or higher in a hot press molding time of 0.4 to 5 seconds . The stamp unit according to any one of claims 1 to 3 , wherein the sealing material is a syringone rubber.   The lower end edge of the holder member and the peripheral edge of the printing material coated with the sealing material are deformed by heat pressure, the peripheral edge of the printing material is formed on a slope, and the lower end edge of the holder member hooks the peripheral edge of the printing material. The stamp unit according to claim 1, wherein the stamp unit is formed on a wedge. The printing material is a laminate of a soft porous body on which a printing plate is made and a hard porous body, and before the hot pressing, all or part of the thickness direction of the soft porous body is the lower end of the holder member. The hard porous body protrudes from the edge, the peripheral edge of the hard porous body is formed on an inclined surface, and the thermal pressure causes the peripheral edge of the soft porous body to deform toward the inclined surface of the hard porous body, and the lower end edge is deformed. The stamp unit according to claim 5 . The lower edge of the holder member, the protective film while covering the entire print face of the stamp material is adhered by thermal welding of the heat pressure simultaneously, the protective film according to claim 5 or 6, wherein formed of a transparent resin film Stamp unit.   2. The stamp unit according to claim 1, wherein the stamp material is a resin porous body in which a black light energy absorbing material is dispersed and contained, and the seal material is black or transparent.

Images