spherical marking

Abstract

To provide a stamp for a spherical surface, in which a load applied to a printing body is appropriately relaxed and which can stamp clearly on a member to be stamped having a convex spherical surface.SOLUTION: A stamp for a spherical surface is capable of stamping on a member 6 to be stamped having a convex spherical surface 61. A stamping head 11 of the stamp comprises: a holder in which a concave spherical surface part 21 for receiving the convex spherical surface 61 is formed; and a printing body 3 with flexibility provided at an end of the holder so as to face the concave spherical surface part 21. In the stamp, when stamping is not being performed, at least a central part of the printing body 3 is alienated from the concave spherical surface part 21.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a spherical seal that can be impressed on an impressed member having a convex spherical surface.

Background Art

[0002] Conventionally, a seal that can be impressed on a convex spherical surface has been known. Patent Document 1 describes a watermelon-specific seal in which a spring body is disposed between a stamp stand having a concave spherical surface portion and a printing surface. This seal can be impressed by deforming the printing surface following its surface shape with respect to either a flat surface or a convex spherical surface.

[0003] Further, Patent Document 2 describes an impression tool including a main body provided with a metal plate curved in a concave curved shape, and a cushioning material and a printing font provided along the metal plate without a gap. This impression tool is configured to be able to press the metal plate from the inside to the outside of the main body, and the curved metal plate and the printing font can be pushed downward to be flat. Thereby, after applying ink to the printing surface using a flat stamp stand, the printing font can be returned to a curved shape to perform an impression on a curved surface.

[0004] When performing an impression using the seal described in Patent Document 1, the substantially central portion of the flat printing surface first contacts a spherical impression object. Therefore, at the vicinity of the center of the printing surface, the load is strongest, and further, a force that resists the compression of the spring body disposed directly below the central portion of the printing font is also applied, making it difficult to relieve the stress at the central portion of the printing font. Rather, since the portion where this spring body contacts the back side of the printing font has a smaller area than the entire printing surface, the stress becomes large. Thus, the loads acting on the central portion and the peripheral portion of the printing surface do not become uniform, and there is a risk of unevenness and deviation in the impression.

[0005] Furthermore, in the stamping device described in Patent Document 2, the printing element and cushioning material are arranged to conform seamlessly to the concave curved surface of the main body. As a result, the pressing force applied to the center of the stamp surface during stamping is not sufficiently relieved, and the load applied to the center and both ends of the stamp surface may become uneven. Consequently, for example, when moving the stamping device or the object to be stamped to make the stamp surface follow the surface of the object to be stamped, excessive stamping pressure may be applied to the center, causing excessive ink discharge and blurring of the stamp impression. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Public Gazette No. 03-12386 [Patent Document 2] Japanese Utility Model Publication No. 07-11349 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The object of the present invention is to solve the above-mentioned conventional problems and to provide a spherical stamp that appropriately relieves the load applied to the stamped material during stamping and can stamp clearly on a stamped member having a convex spherical surface. [Means for solving the problem]

[0008] To solve the above problems, a spherical stamp capable of stamping on a stamped member having a convex spherical surface is provided, wherein the stamp head comprises a holder having a concave spherical portion that receives the convex spherical surface, and a flexible printing body provided at the end of the holder so as to face the concave spherical portion, and when not stamping, at least the central part of the printing body is separated from the concave spherical portion.

[0009] Furthermore, it is preferable that the printing element is a porous membrane printed on a frame, and that an ink absorber is provided between the printing element and the concave spherical portion.

[0010] Furthermore, it is preferable that the frame has an opening that is substantially circular in shape when viewed from above, and that the printing element is stretched so as to cover the opening. [Effects of the Invention]

[0011] The present invention makes it possible to provide a spherical stamp that can clearly imprint on a stamped member having a convex spherical surface. [Brief explanation of the drawing]

[0012] [Figure 1] This is a perspective view showing a spherical stamp according to an embodiment. [Figure 2] This is a perspective view of the stamp head of the embodiment. [Figure 3] This is an exploded perspective view of the stamp head of the embodiment. [Figure 4] This is a cross-sectional view of the stamp head of the embodiment. It shows the state in which the object to be stamped and the stamp surface are in contact at the start of the stamping operation. [Figure 5] This is a cross-sectional view showing a state in which the stamped member presses further against the printing body, resulting in a smaller stress relaxation space, compared to the state shown in Figure 4. [Figure 6] Figure 5 shows a cross-sectional view of the state in which the object to be stamped presses further against the printing body, and substantially the entire back surface of the ink absorber is in contact with the concave spherical surface of the holder. [Modes for carrying out the invention]

[0013] The following describes embodiments for carrying out the invention. The spherical stamp 1 of the present invention is a stamp that can be used to stamp on the surface of a stamped member having a convex spherical surface, such as a ball. As shown in Figure 1, the spherical stamp 1 of the embodiment consists of a printing body 3 and a cover frame. DepartmentIt includes a seal head 11 having a number 4, a handle 7 into which the seal head 11 is fitted, and a cap 71 that can cover the seal font 3 and the lid frame portion 4. Note that the means for gripping the seal head 11 is not limited to the handle 7 and may have other shapes. Also, the stamping method is not limited to being performed by holding it in the hand, and it may be a spherical seal 1 in which the seal head 11 is attached to a mechanical device or the like.

[0014] The seal head 11 will be described. As shown in FIG. 2, the seal head 11 of the embodiment includes a holder 2 and a flexible seal font 3. The seal font 3 of the embodiment is a porous film seal font having a printing surface 31 formed on the outside, and is disposed at an end of the holder 2. <(

[0015] Also, the seal head 11 of the embodiment includes a lid frame portion 4 which is a frame-shaped lid that can be fitted into the holder 2, and an opening 41 that is substantially circular in plan view is formed on the upper surface of the lid frame portion 4. The seal font 3 is stretched over the lid frame portion 4 so as to cover the opening 41. The holder 2 and the lid frame portion 4 of the embodiment are formed of a synthetic resin, but the material is not limited thereto.

[0016] As shown in FIG. 3, the holder 2 of the embodiment is generally in a substantially cylindrical shape, and a concave spherical surface portion 21 which is a spherical surface with a recess in the center is formed on the upper side in the figure. The concave spherical surface portion 21 receives the convex spherical surface to be stamped, and it is preferably formed such that the concave spherical surface portion 21 has an arc shape with a curvature radius substantially the same as that of the convex spherical surface radius. The seal font 3 is disposed at the upper end of the holder 2 on the upper side in the figure so as to face the concave spherical surface portion 21.

[0017] Also, in the present embodiment, an ink absorber 5 that is circular in plan view is disposed between the seal font 3 and the concave spherical surface portion 21. The ink absorber 5 in this example is formed of a foam of polyvinyl formal resin and can store the impregnated ink. Since the seal font 3 is a porous film as described above, it can suck up the ink impregnated in the ink absorber 5 and supply it to the printing surface 31.

[0018] Note that, instead of providing the ink absorber 5, a configuration may be adopted in which ink is applied to the printing surface 31 using a stamp stand or the like and then stamped. In the case of the printing head portion 11 that does not include the ink absorber 5, it is preferable to provide a cushioning sponge body that can absorb the pressing force during stamping instead of the ink absorber 5, but it is not necessarily required to provide such a sponge body.

[0019] Regarding the behavior of the printing head portion 11 of the embodiment during stamping, as shown in FIGS. 4 to 6, the case of stamping on the convex spherical surface 61 of the stamped member 6 will be described as an example. Note that the stamped member 6 in this example is a baseball, and the convex spherical surface 61 is an arbitrary outer surface of the baseball.

[0020] As shown in FIG. 4, at the start of the stamping operation, at least the central portion of the printing type 3 of the printing head portion 11 of the embodiment is separated from the concave spherical surface portion 21, and a stress relaxation space S is formed between the printing type 3 and the concave spherical surface portion 21.

[0021] When holding the handle 7 by hand and performing a stamping operation of pressing the printing surface 31 against the convex spherical surface 61, as shown in FIG. 4, first, the apex 62 of the convex spherical surface 61 contacts the substantially central portion of the printing type 3. Subsequently, as shown in FIG. 5, the stamped member 6 pushes down and deflects the printing type 3 and the ink absorber 5, and moves downward in the figure while reducing the stress relaxation space S. Thus, when the stress relaxation space S is provided between the printing type 3 and the concave spherical surface portion 21, the load received from the stamped member 6 can be received by the deflection of the film-like printing type 3.

[0022] Thereby, until substantially the entire back surface of the ink absorber 5 abuts against the concave spherical surface portion 21, the pressing force from the stamped member 6 can be released, and the stress can be prevented from being concentrated on the central portion of the printing type 3. At this time, if the printing type 3 is configured to be stretched outwardly over its entire circumference as in this embodiment, it is preferable because when the printing type 3 receives pressure from the stamped member 6, it can deflect uniformly in all directions.

[0023] Furthermore, when a downward pressure is applied to the stamped member 6 in the figure, as shown in Figure 6, almost the entire back surface of the ink absorber 5 abuts against the concave spherical surface 21, compressing the ink absorber 5, and almost the entire printing body 3 comes into close contact with the convex spherical surface 61 of the stamped member 6, forming an imprint on the convex spherical surface 61.

[0024] Thus, by using the spherical stamp 1 of this embodiment, the stress on the print body 3 is relieved until it comes into close contact with the convex spherical surface 61 of the stamped member 6. As a result, the print body 3 is pressed uniformly across its entirety, which suppresses uneven load distribution between the center and periphery of the print body 3 and makes it possible to form a clear imprint. Therefore, the load on the print body 3 during stamping is appropriately relieved, making it possible to provide a spherical stamp 1 that can clearly imprint on the stamped member 6 having a convex spherical surface 61.

[0025] Furthermore, if a cushioning member such as an ink absorber 5 is provided between the printing body 3 and the concave spherical portion 21, as in this embodiment, in addition to the load reduction described above, the cushioning effect makes it easier to obtain an even clearer imprint.

[0026] Although the present invention has been described above with reference to the embodiments described, the present invention is not limited to the above embodiments and can be implemented in various forms. [Explanation of symbols]

[0027] 1 Spherical stamp 11 Seal head 2 holders 21 Concave spherical part 3. Printing font 31 Seal 4 Lid frame 5. Ink absorber 6 Non-printing member 61 Convex spherical surface 62 vertices 7. Handle 71 Cap

Claims

1. A spherical stamp capable of imprinting on a stamping target having a convex spherical surface, The head of the seal is, A holder having a concave spherical portion that receives the convex spherical surface, A flexible printing element is provided at the end of the holder so as to face the concave spherical portion, The system comprises a cushioning foam provided between the printing body and the concave spherical portion, The aforementioned printing element is a porous film printing element stretched over a frame, When not stamped, at least the central part of the foam is separated from the concave spherical part, and a stress relaxation space is formed between the foam and the concave spherical part. A spherical stamp in which substantially the entire back surface of the foam can come into contact with the concave spherical surface when stamping.

2. The spherical stamp according to Claim 1, wherein the frame has an opening that is substantially circular in plan view, and the printing element is stretched outward around its entire circumference so as to cover the opening.

3. The spherical stamp according to claim 1 or 2, wherein the foam is an ink absorber.

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