JP3507878B2 - Round rubber stamp - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a penetrating rubber stamp provided with a porous rubber printing body capable of continuous marking in the lower end cylindrical portion of the stamp body, and more specifically, a round rubber stamp called a name stamp. Regarding the format.

[0002]

2. Description of the Related Art In a conventional rubber stamp of this type, as will be described with reference to the accompanying drawings, a porous rubber printing body 2 is fixed in a circular cylinder portion 1a at the lower end of a stamp main body 1 through a stopper 9, and a circular cylinder is formed. The ink storage mat 3 is arranged in the portion 1a such that the lower surface 14 of the ink storage mat 3 is in full contact with the upper surface 12 of the rubber printing body 2.
According to this method, the ink is previously supplied to the ink storage mat 3 from above so as to be stored therein, and this ink is transferred to the rubber printing body 2 as it is used.

However, since the rubber printing body 2 is porous, it is easily deformed by compression, and as shown in FIG.
The projecting dimension S, that is, the dimension S between the stopper 9 and the stamp surface 10 must be set strictly. If the protruding dimension S is too large, the printing surface 10 is excessively compressed and deformed at the time of imprinting, and the imprint is deformed and the ink becomes sticky. This is because if the protruding dimension S is too small, it will not be possible to imprint and the imprint will be faint. However, in order to strictly control the above-mentioned protrusion dimension S, it is necessary to improve the manufacturing accuracy of the stamp main body 1, the rubber printing body 2, the stopper 9, and the like, and also to secure the assembling accuracy.
This deteriorates productivity and yield, and consequently raises the unit price of the product. On the other hand, even if the stamp face height adjusting mechanism is separately provided in the stamp main body 1, the number of members increases and the manufacturing cost becomes high.

Therefore, the present applicant has filed Japanese Patent Application No. 5-29425.
As shown in FIG. 7, a large number of convex portions 13 are integrally formed on the upper surface 12 of the rubber printing body 2 as shown in the figure, and the upper surface 12 of the rubber printing body 2 is formed on the lower surface 14 of the ink storage mat 3 through the convex portion 13 group. A rubber stamp with a contact structure was proposed. According to this, when the lower end marking surface 10 of the rubber printing body 2 which is rich in compression deformability is pushed onto the paper surface, the convex portions 13 group are compressed and deformed in advance, so that the protruding dimension S of the marking surface 10 is made larger than the conventional one. If set, the variation in the protruding dimension S can be absorbed well, and a dimension accuracy error can be dealt with.

However, another problem was noticed. In the case of a circular stamp in which the rubber printing body 2 has a circular shape, it cannot originally be press-fitted into the circular cylinder portion 1a of the stamp main body 1 and firmly fixed, and naturally has a tendency to swell when ink is contained. Therefore, when the ink content in the rubber printing body 2 is reduced during use, the rubber printing body 2 is inadvertently rotated in the circular cylinder portion 1a and does not match the front display 17 provided on the outer surface of the stamp main body 1. We saw the occurrence of defective products that were stamped.

In order to prevent the rubber printing body 2 from rotating in this way, in Japanese Utility Model Publication No. 2-43745, the stamp main body 1 is used.
A plurality of projections having sharp tips are provided downward in the circular cylindrical portion 1a on the side, and these projections are designed to bite into the upper surface 12 of the rubber printing body 2 by utilizing its own elasticity. According to this, the relative rotation stop of the rubber printing body 2 can be achieved.

[0007]

However, since the porous rubber-printed body 2 is highly elastic, a dent deformation occurs in the portion where the protrusion is bitten, and this dent deformation spreads to the upper surface 12 of the rubber-printed body 2. Depending on the case, the lower end marking surface 10 of the rubber printing body 2 may be dented and deformed, which may cause the marking surface not to be finished in a highly accurate manner. In addition, the fact that the rubber printed body 2 is subjected to the above-mentioned concave deformation means that the internal continuous pores are subjected to compressive deformation, and the ink flow at the relevant portion becomes poor. Therefore, on the lower end marking surface 10 of the rubber printing body 2, the amount of ink bleeding out varies,
There is a risk of sticking or blurring on a part of the imprint, leading to uneven printing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a round rubber stamp having an ink storage mat and a porous rubber printing body and capable of continuous imprinting, and the protrusion size of the printing surface of the rubber printing body from the printing main body varies. However, this variation can be absorbed by a simple means to enable continuous clear marking at all times. Another object of the present invention is to obtain a round stamp in which a circular rubber printing body fitted in a circular tubular portion at the lower end on the stamp body side is provided with a rotation stopping means.

[0009]

As shown in FIG. 5, a round rubber stamp of the present invention has a circular cylindrical portion 1 at the lower end on the stamp body 1 side.
A porous rubber printing body 2 formed in a circular shape is fitted in a, and an ink storage mat 3 is disposed on the rubber printing body 2 in the circular tubular portion 1a. A large number of convex portions 13 are integrally formed on the upper surface 12 of the rubber printed body 2 so as to project over the entire surface, and the upper surface 12 of the rubber printed body 2 contacts the lower surface 14 of the ink storage mat 3 through the convex portion 13 group. There is. Specifically, as shown in FIG. 4, the rubber printing body 2
A large number of convex portions 13 are formed in a grid pattern.

In such a round rubber stamp, according to the present invention, as shown in FIGS. 1 and 3, the circular cylinder portion 1 on the stamp body 1 side.
A downward receiving surface 8 for receiving the outer peripheral edge portion of the upper surface 12 of the rubber printing body 2 is formed on the inner peripheral surface of a, and a projection 16 is provided at a proper position on the receiving surface 8 to provide an upper surface of the rubber printing body 2. 12
The protrusions 16 are engaged with the recesses 15 between the protrusions 13 at the outer peripheral edge of the. Alternatively, as a rotation stopping means, a notched surface 16a instead of the protrusion 16 is formed on the receiving surface 8 as shown in FIG.
The notched surface 16a is adapted to engage with the outer peripheral edge portion of the upper surface 12 of the rubber printing body 2.

[0011]

The porous rubber print 2 is originally rich in compressive deformability. Therefore, as shown in FIG.
When is pressed against the surface of the paper, the reaction force positively compresses and deforms each convex portion 13 first. Therefore, even if the protruding dimension S of the stamp surface 10 is set to be larger than the conventional one, the dimensional error is still
It is absorbed by the compression deformation of the third group. Since each convex portion 13 is always in contact with the ink storage mat 3, when the ink in the rubber printing body 2 is insufficient, it is not limited to when the convex portion 13 is compressed and deformed, and the ink is always passed through each convex portion 13 group. Ink flows from the storage mat 3 into the rubber printing body 2.

In the circular cylinder portion 1a on the stamp body 1 side,
The outer peripheral edge portion of the upper surface 12 of the rubber printing body 2 is received by the receiving surface 8 of the circular cylindrical portion 1 a via the convex portion 13.
At this time, the protrusion 16 provided at a proper position on the receiving surface 8 enters into the recess 15 between the adjacent convex portions 13 on the upper surface 12 of the stamp body 1 and engages with the concave portion 15, whereby the rubber printing body 2 is held in the circular cylindrical portion 1a. Prevents rotation in the circumferential direction. Even if the protrusion 16 may ride up on the convex portion 13 at the beginning of the assembling, if the rubber printed body 2 rotates even a little, the protrusion 16 will not protrude.
Since the recess 15 is engaged with the recess 15, the rubber print 2 is prevented from further rotating. If the protrusions 16 are provided at a plurality of positions, it is highly possible that at least one of the protrusions 16 engages with the recess 15 at the beginning of the assembling.

When the receiving surface 8 is provided with a serrated surface 16a wholly or partially, the serrated surface 1 is formed.
6a frictionally engages with the uneven upper surface 12 of the stamp main body 1 generated by the convex portions 13, and this also prevents the rubber printing body 2 from rotating without pressing and deforming the inside of the main body of the rubber printing body 2. Try.

[0014]

According to the present invention, since a large number of convex portions 13 provided integrally on the upper surface 12 of the rubber printing body 2 are compressed and deformed prior to printing, the projecting dimension S of the stamp surface 10 is set larger than before. Even if the convex portion 13 is compressed and deformed, the error in the dimension S is absorbed, so that clear continuous marking can be always performed. That is, since the tolerance of the processing accuracy or the assembly accuracy of the rubber printing body 2 and the fasteners 9 can be widened without lowering the quality, the productivity can be improved and the penetrating rubber stamp can be provided at a low cost.

Further, in the present invention, the protrusion 16 or the notched surface 16a formed on the receiving surface 8 is the rubber printing body 2.
Since the convex portion 13 on the upper surface of the rubber print body 2 is abuttingly engaged with the upper surface of the rubber print body 2, this prevents the circular rubber print body 2 from rotating carelessly in the circular cylindrical portion 1a at the lower end of the stamp body 1. In addition to being able to prevent it, the presence of this detent prevents the rubber printed material 2
It has the advantage of eliminating the adverse effects of applying compressive deformation to the inside of the body.

[0016]

【Example】

(First Embodiment) FIGS. 1 to 6 show a first embodiment of a round rubber stamp according to the present invention, in which a circular cylindrical portion 1a at the lower end on the side of the round stamp main body 1 has a circular shape. The molded porous rubber printing body 2 is fixed, and the ink storage mat 3 is disposed above the rubber printing body 2 in the circular tubular portion 1a.

In FIG. 2, a vertically elongated cylindrical cap 4 which also serves as a grip is detachably attached above the outer periphery of the stamp body 1, and a circular stand 5 is pulled out downward at the lower end of the stamp body 1. It is mounted so that it can be slid up and down for stopping. When the cap 4 is removed, ink can be supplied from above to the ink storage mat 3 through the upper end opening 6 of the stamp body 1. The stand 5 is urged downward by a compression spring 7 mounted between the upper end of the stand 5 and the stamp body 1.

In FIG. 2, the rubber printing body 2 is formed of a porous rubber material having continuous pores. Circular cylinder 1a
3 is formed into a stepped shape with substantially the same thickness as shown in FIG. 3, and therefore has a stepped receiving surface 8 facing downward on the inner peripheral surface, and the area below the receiving surface 8 is large in diameter. The upper part has a smaller diameter. The ink storage mat 3 is inserted into the circular cylindrical portion 1a from the lower surface side of the opening, and then the rubber printing body 2 is fitted. Then, as shown in FIG. 5, the rubber printing body 2 is fixed to the stamp main body 1 through the stoppers 9 while the outer peripheral edge of the upper surface 12 of the rubber printing body 2 is received by the receiving surface 8. The lower edge of the stopper 9 is the lower edge 11 of the stamp main body 1.
The stamp surface 10 at the lower end of the rubber printing body 2 slightly projects below the lower end edge 11.

The ink storage mat 3 is made of vinyl acetate or the like and is formed into a porous columnar shape. The ink storage mat 3 has a porosity and a pore diameter larger than that of the rubber printing body 2 and is harder than the rubber printing body 2, and the ink contained in the ink storage mat 3 is transferred to the rubber printing body 2 as it is used. To go. As shown in FIGS. 3 and 5, another stepped receiving surface 8a is formed further above the receiving surface 8 on the inner peripheral surface of the circular cylindrical portion 1a, and the outer peripheral edge portion of the upper surface of the ink storage mat 3 is formed. Are received by the receiving surface 8a, and in this state, the lower surface 14 of the ink storage mat 3 comes into contact with the upper surface 12 of the rubber printing body 2.

When not in use, as shown in FIG. 1, the lower portion of the stand 5 is projected below the stamp body 1 by the elastic force of the compression spring 7 to prevent the stamp surface 10 of the rubber printing body 2 from touching the paper surface. is doing. When the lower end opening of the stand 5 is applied to the paper surface during use and the stamp body 1 is pushed from above, the stand 5 rises against the spring force of the compression spring 7 and the stamp surface 10 contacts the paper surface as shown in FIG. .

In such a round rubber stamp, as shown in FIGS. 1 and 4, a large number of small convex portions 13 are formed on the upper surface 12 of the rubber printing body 2 at regular intervals over the entire surface, specifically, in a grid pattern. The upper surface 12 of the rubber printing body 2 is brought into contact with the flat lower surface 14 of the ink storage mat 3 through the convex portions 13 of the rubber printing body 2. In FIG.
Each of the protrusions 13 is formed in a square shape having a side length of 1.0 mm and a height of 0.7 mm, and the arrangement pitch of the protrusions 13, that is, the depressions 15 between the adjacent protrusions 13 and 13 are formed. Width is about 1.0mm
And The height of each convex portion 13 can be changed within the range of 0.7 to 1.0 mm according to the size of the stamp surface 10. The dimension S between the lower end edge 11 of the stamp body 1 and the stamp surface 10 is set to 0.3 to 0.5 mm. The protruding dimension S of the stamp surface 10 is larger than that of the conventional one.

In FIG. 6, when the stamp surface 10 is pressed against the paper surface until the lower end edge 11 of the stamp body 1 comes into contact with the paper surface, each convex portion 13 group is first compressed and deformed.
Absorbs the compressive deformation force applied to. That is, the porous rubber print 2 is originally rich in compressive deformability, but each convex portion 13 having a small cross-sectional area is more likely to be compressively deformed. Therefore, even if the protrusion dimension S of the stamp surface 10 is set larger than that of the conventional one, the convex portion 13 group is compressed and deformed in advance, so that the stamp surface 10
Excessive compressive deformation force does not reach. As a result, it is possible to perform clear marking without the imprint's shape loss or ink stickiness. In other words, since the size S can be set to a size larger than the conventional size, the penetrating rubber stamp can be formed without being significantly affected by the processing accuracy of the stamp main body 1, the rubber printing body 2, the stopper 9, and the assembling accuracy. I was able to make it.

The ink impregnated in the corresponding portion is squeezed out into the recess 15 by the compressive deformation of each convex portion 13. In addition, since each convex portion 13 is always in contact with the ink storage mat 3 even when it is not used, when the ink in the rubber printing body 2 is reduced, the ink storage mat 3 is removed from the rubber printing body 2 via these convex portions 13. The ink penetrates into the ink and enables continuous marking. Since the recess 15 also functions as an ink reservoir, the total amount of ink impregnated in the stamp increases and the number of clear markings increases.

In the round stamp having the above structure, the stamp main body 1
As shown in FIG. 3, the receiving surface 8 is provided in the circular cylindrical portion 1a.
A plurality of narrow rib-shaped projections 16 are integrally projected downward at a circumferential thickness of 0.9 mm at a plurality of positions in the circumferential direction, specifically, at four equidistant positions. Each of the protrusions 16 in the figure is formed so as to be inclined downward from the receiving surface 8 to the inner surface of the circular cylindrical portion 1a.

Vertical and horizontal recesses 15 formed in a grid pattern
Has a linear groove shape in a plan view, and is open at the outer peripheral edge on the upper surface of the upper surface 12 of the rubber printing body 2. The circumferential width and the protrusion amount of each protrusion 16 are formed to have a size substantially corresponding to the opening width and depth of the protrusion 13, in other words, the recess 15. Therefore, when the rubber printing body 2 is fitted into the circular tubular portion 1a and the rubber printing body 2 is mounted and fixed in the above-described manner, the protrusions 16 are formed on the outer peripheral edge portion of the upper surface 12 of the rubber printing body 2 so that the adjacent convex portions 13 Thirteen
It fits and engages with the recess 15 between. By this uneven fitting,
It is always correct if the rubber print pair 2 can be prevented from rotating without compressing and deforming the main body of the rubber print body 2 and as shown in FIG. The imprint of the direction can be obtained.

In the figure, reference numeral 20 denotes a middle tubular body which allows the stamp body 1 to be fitted from below and allows the cap 4 to be detachably mounted from above. Stamp body 1
An ink cartridge 21 is attached to the upper end opening 6 of the cartridge so that it can be taken in and out from above, and ink is supplied to the ink storage mat 3 through the ink cartridge 21. A lid 22 can be detachably fitted on the lower end of the middle tubular body 20 from below, and the lid 22 can cover the stamp surface 10 at the lower end of the rubber printing body 2 when not in use.

(Second Embodiment) FIG. 7 shows a second embodiment of the present invention, in which a rotation preventing projection 16 is vertically provided downward from the receiving surface 8. In this case, the protrusion 16 may have a round or square cross section, and unless the upper surface 12 of the rubber printing body 2 is largely compressed and deformed downward,
It suffices to fit it into the recess 15.

(Third Embodiment) FIG. 8 shows a third embodiment of the present invention, in which the receiving surface 8 is notched 16
a was formed. Also by this, the notched surface 16a is well frictionally engaged with the upper surface 12 of the rubber printing body 2 having the unevenness due to the presence of the convex portion 13 in a state of being lightly pressed and deformed, and the rotation prevention of the rubber printing body 2 can be achieved. .

(Another embodiment) The projection 16 and the serrated surface 16a to be formed on the receiving surface 8 may be formed on at least one place on the receiving surface 8. The receiving surface 8 is the circular cylindrical portion 1.
It is not necessary that the inner surface of a is formed continuously as a circling collar, but may be formed in a divided shape. The convex portion 13 is not limited to the rectangular shape, but may be, for example, a hemispherical shape. The size and arrangement interval of the convex portions 13 can be appropriately changed according to the size and material of the stamp surface 10. The protrusion 16 and the notched surface 16a also include a form in which the upper surface 12 of the rubber printing body 2 including the convex portion 13 is partially compressed and deformed. The stamp body 1 in the present invention means, for example, the illustrated middle cylinder body 20 and cap 4
This is a concept that also includes a form in which this is integrally formed including the above.

[Brief description of drawings]

FIG. 1 is an enlarged vertical front view of a main part.

FIG. 2 is an external perspective view and an exploded perspective view of the whole.

FIG. 3 is a partially cutaway perspective view of a stamp main body.

FIG. 4 is a perspective view of the rubber printed body as seen from the upper surface side.

FIG. 5 is a vertical sectional front view of a main part.

FIG. 6 is a vertical cross-sectional front view of a main part during use.

FIG. 7 is a vertical cross-sectional front view of a main part showing a second embodiment.

FIG. 8 is a vertical cross-sectional front view of the essential parts of the third embodiment.

[Explanation of symbols]

1 stamp body 2 rubber print 3 Ink storage mat 10 seal face 11 Bottom edge of stamp body 12 Upper surface of rubber print 13 convex 14 Lower surface of ink storage mat 15 dent 16 protrusions 17 Front display

Claims (3)

(57) [Claims] 1. A circular rubber print body 2 formed in a circular shape is fitted in a circular cylinder portion 1a at the lower end on the side of the stamp main body, and an ink storage mat 3 has a rubber print body in the circular cylinder portion 1a. 2 are arranged so as to be positioned above, and a large number of convex portions 13 are integrally formed on the upper surface 12 of the rubber printing body 2 so as to project over the entire surface. In the round rubber stamp that is in contact with the lower surface 14 of the ink storage mat 3, the rubber printing body 2 is attached to the inner peripheral surface of the circular cylinder portion 1a on the stamp body 1 side.
Is formed with a receiving surface 8 which faces downward on the outer peripheral edge of the upper surface 12 of the upper surface of the rubber print body 2. The receiving surface 8 is engaged with a recess 15 between the convex portions 13 of the outer peripheral edge of the upper surface 12 of the rubber printing body 2. Protrusion 1
Round rubber stamp with 6 2. A circular rubber printing body 2 formed in a circular shape is fitted in a circular tubular portion 1a at the lower end on the side of the stamp body 1, and an ink storage mat 3 is provided with a rubber printing body in the circular tubular portion 1a. 2 are arranged so as to be positioned above, and a large number of convex portions 13 are integrally formed on the upper surface 12 of the rubber printing body 2 so as to project over the entire surface. In the round rubber stamp that is in contact with the lower surface 14 of the ink storage mat 3, the rubber printing body 2 is attached to the inner peripheral surface of the circular cylinder portion 1a on the stamp body 1 side.
Is formed with a downward receiving surface 8 for receiving the outer peripheral edge portion of the upper surface 12, and the receiving surface 8 is provided with a serrated surface 16a that engages with the outer peripheral edge portion of the upper surface 12 of the rubber printing body 2. A round rubber stamp. 3. The rubber printed body 2 is provided with a large number of projections 13 formed on the upper surface 12 thereof in the shape of a grid.
The round rubber stamp described.