JPS6313775A - Date stamp - Google Patents

Abstract

PURPOSE:To obtain a date stamp having a rubber type body capable of minimizing a deformation due to swelling even the being impregnated with an ink in use, by integrally backing the rubber type body with a non-stretchable fabric on the rear, and adhering the rear to lower surface of main body of the stamp. CONSTITUTION:A non-stretchable fabric 25 consisting of a woven fabric of Tetoron-nylon is spread, and a green rubber material (NBR) 20a containing an easily soluble substance such as a salt and a sugar uniformly mixed therein is laid in a sheet form on the fabric 25. The fabric 25 and the rubber material 20a are placed in a metallic mold, the rubber material 20a is vulcanized under pressure and heat, and a type 22 is formed at the surface of the rubber material 20a. The rubber material 20a penetrates into the weave opening of the fabric 25, so that both of the members are bonded to each other in a body. An intermediate molded article in immersed in a liquid to extract the easily soluble substance from the rubber material 20a.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a date stamp for stamping the date of receipt on documents, and takes measures to prevent deformation by impregnating the rubber print body attached to the bottom surface with ink. It is something.

[Conventional technology]

FIGS. 5 to 7 illustrate date stamps to which the present invention is directed, which are known in Japanese Utility Model Application No. 55-177462 and Publication Utility Model Publication No. 59-12213.

The details will be described later, but basically, a date changing mechanism 4 is built into the stamp body 1, and a sliding frame 3 is externally supported on the lower end of the stamp body 1 so as to be movable up and down. A plate-shaped rubber printed body 20 is attached to the lower surface of the sliding frame 3, and a window 21 is transparently provided in the center of the rubber printed body 20.

Then, by operating the sliding frame 3, each rubber printing belt 11 of the date changing mechanism 4 can be manually rotated from the outside to change the date, and when in use, each rubber printing belt 11 is passed through the window 21 to the rubber printing belt 11. 20, characters such as ``Date of Reception'' can be imprinted on the rubber printed body 20, and numbers such as ``year, month, day'' can be imprinted on the rubber printed body 11.

In such date stamps, in order to enable continuous stamping, the rubber printing body 20 and the rubber printing belt 11 are made porous with ink-impregnating properties. It is publicly known.

In addition, in order to form the rubber printed body 20 to be porous,
It is also possible to mix unvulcanized rubber material with easily soluble substances such as salts and sugars and vulcanize it, then place the intermediate molded product into the liquid to extract the easily soluble substances.

For example, it is known from Japanese Utility Model Application Publication No. 60-3060.

It is also known that it can be obtained by a sintering method.

[Problem that the invention seeks to solve]

This type of rubber print body 20 has a problem in that it swells and deforms when impregnated with ink, causing the stamp impression to lose its shape. In particular, since the rubber printed body 20 has a window 21 in the center thereof through which the rubber printed bell 11 enters and exits, swelling deformation is noticeable. The periphery of the window 21 tends to have a meandering shape.

Needless to say, if such deformation becomes noticeable, the product value will be lost.

According to the experience of the present inventor, when molding the rubber printed body 20, the above-mentioned easily soluble substance is extracted by placing the intermediate molded product after vulcanization molding into a liquid.

Once it contains liquid, it expands and deforms greatly. It is thought that the difference in osmotic pressure is also a major cause. Next, when the intermediate molded product was dried, it tried to restore to its original size, but even during this restoration, excess and deficiency occurred, and deformation was observed even when the rubber printed body 20 was commercialized. This is because the outer shape and the window 21 are punched out from the cloak-shaped intermediate molded product while the individual rubber printed bodies 20 remain deformed.

In particular, when attaching the back side of the rubber printed body 20 to the bottom surface of the sliding frame 3, a so-called double-sided adhesive tape is used.
As shown in FIG.
Then, attach release paper 28.

Peeling off the Ml separation layer 28 and pasting it with adhesive 27 as shown in FIG. 1 leads to improved workability.

Since this type of adhesive 27 does not completely dry even after it is commercialized, the rubber printed body 20 impregnated with ink moves on the adhesive surface, further aggravating the problem.

[Purpose of the invention]

The present invention has been proposed to eliminate such conventional problems.

An object of the present invention is to obtain a date stamp with a rubber printed body that can suppress swelling and deformation as much as possible even when impregnated with ink during use.

[Means for solving problems]

Among the conventional defects in the date stamp rubber print body 20,
Naturally, this is noticeable in rubber printed bodies that are porous to enable continuous stamping and have a window 21 in the center for changing the date.

Incidentally, the swelling of the rubber printed body 20 as described above is a phenomenon or a result, and the cause thereof is not necessarily clear. However, considering that rubber materials swell with certain solvents, it is understandable that the rubber printed body 20 tends to swell with various solvents in ink even if it does not dissolve.

In addition to it.

This is presumed to be because the rubber printed body 20 is porous all the way to the inside and has an abnormally large surface area, making it susceptible to swelling deformation and easily noticeable.

Therefore, in the present invention, a porous rubber printed body 20 having a window 21 is integrally lined with a non-stretchable fabric 25 on the back side, and this back side is attached to the bottom surface of the stamp body 1. It is.

Here, the non-stretchable fabric 25 includes all kinds of woven fabrics, knitted fabrics, and non-woven fabrics, regardless of whether they are made of natural fibers or synthetic fibers, as well as fabrics made of various metal fibers or knitted stainless steel wires of small diameter. It is a concept that also includes things (like wire mesh). Moreover, non-stretchability does not refer to a comparison between the two fabrics, but only refers to a relative property compared to the elasticity of the porous rubber printed body 20. Therefore, as long as the fabric 25 itself is not highly elastic, it may have wettability.

〔Effect of the invention〕

According to the present invention as described above, even if the rubber printed body 20 is impregnated with ink and attempts to swell and deform.

The non-stretchable fabric 2S used as the backing prevents the swelling and deformation, resulting in a sharp impression that does not lose its shape and maintains high quality.

Also, in the present invention, double-sided adhesive tape is used.

Apply adhesive 27 to the back side of the rubber printed body 20 on the bottom side of the stamp body 1.
The embodiment in which it is pasted can also be adopted without any problems,
In this case, productivity can be expected to improve.

In addition, the non-stretchable fabric 2S is interposed on the back surface, which prevents the ink from penetrating freely into the adhesive layer, thereby preventing the rubber printed body 20 from peeling off from the stamp body 1. This can often be prevented.

〔Example〕

5 to 7 show date stamps to which the present invention is directed.

In the figure, reference numeral 1 denotes a stamp body in the shape of a rectangular tube with an open bottom. This stamp body 1 has a pair of front and back halves, la and 1b.
Tie them together and place square frame 2 on the top edge.

A sliding frame 3 is fitted onto the lower end of each plate to maintain the combined state, and a date changing mechanism 4 is built in. A handle 5 is provided on the second side.

The date changing mechanism 4 has a support shaft 7 at the top of the portal frame 6.

A bridge 9 is attached to the lower end between the left and right sides,
Four dials 10 (shown in the figure) are rotatably supported on the support shaft 7, and endless rubber printing pads 11 are wound in parallel on the left and right between the shaft portion of each dial 10 and the bridge 9. Each rubber-printed belt 11 can be rotated by hand using each dial 10 exposed on the front and rear outer surfaces of the main body 1. Each rubber printing belt 11 is made of a porous rubber material that can be impregnated with ink, and a printing part 12 for stamping "year, month, and day" in Arabic numerals is formed protruding from its surface.

The sliding frame 3 is a plastic molded product that is integrally formed with a circular seat plate 14 having a horizontally elongated rectangular opening 13 in the center, and frame pieces 15 erected from the left and right sides of the seat Fi14. Upper and lower elongated holes 16, 16 are provided below the left and right joints of the sliding frame 3, and bearing holes 17, 1 are provided in the frame pieces 15, 15.
7 are transparent, and these long holes 16 and bearing holes 1
A shaft 18 is inserted between the stamp body 1 and the shaft 18, and the sliding frame 3 is supported by the shaft 18 so as to be movable up and down on the stamp body 1.

A circular annular collar 19 is attached to the seat plate 14 of the sliding frame 3 from the outer periphery of the lower end.
A plate-shaped rubber printed body 20 is adhered to the lower surface of the seat plate 14 within this annular collar 19.

In FIG. 1, at the center of the rubber printed body 20.

A rectangular window 21 corresponding to the opening 13 is provided through the window, and the entire window is made of a porous rubber material that can be impregnated with ink, and the "reception date" and "name" are stamped on the surface. A printed portion 22 is formed to protrude.

When using this, push down the sliding frame 3 from the stamp body 1 as shown by the temporary lines in Fig. 7, and press the corresponding dial 10.
Turn the button to move the corresponding rubber printing heald 11 to change the date. When the sliding frame 3 is pushed up against the stamp body 1, the surface of the lower end printing portion 12 of the rubber printing belt 11 group passes through the opening 13 and the window 21 and connects with the surface of the lower end printing portion 2.2 of the rubber printing body 20. It becomes flush. If both the town character parts 12 and 22 are pressed onto the document in this form, the rubber printing belt 11 and the rubber printing body 20 can be continuously stamped with the ink that has been impregnated in advance. The annular shape t''-r t9 serves to restrict excessive compressive deformation of the rubber printing heel 11 and the rubber printing body 20 during stamping, and to prevent the impression from becoming sticky or losing its shape.

Now, in the known date stamp, the present invention is one in which a characteristic improvement is added to the cross-sectional structure of the rubber print body 20. Next, an example regarding this rubber printed body 20 will be described.

[Example 1] A method for manufacturing a rubber printed body 20 of the present invention will be explained in order of steps.

First, as shown in FIG. 2, a non-stretchable fabric 25 made of woven Tetron-nylon fabric is laid out, and salts $, l! [Unvulcanized rubber material (NBR) 20a that can uniformly mix easily soluble materials such as [] is stacked in a sheet form.

The fabric 25 and the rubber material 20a are placed in a mold, and the rubber material 20a is vulcanized under pressure and heat, and the printing 22 is formed on the surface of the rubber material 20a. rubber substance 2
0a is included in the weave of the fabric 25, and the two are bound together.

The thus obtained intermediate molded product was placed in a liquid, and a rubber product M20
The above-mentioned easily soluble substance is extracted from a.

After the extraction process, it is dried. FIG. 3 shows the intermediate molded product 26 after drying, in which a large number of unit rubber printed bodies 20 are lined up horizontally and vertically and simultaneously molded onto a sheet-like body.

On the back side of this intermediate molded product 26, as shown in FIG. 3, a release paper 28 covering the outer surface of the adhesive 27° is attached entirely using double-sided adhesive tape.

Finally, each rubber printed body 20 is punched out from the intermediate molded product 26 so as to have a predetermined outer shape and window 21 as shown in FIG. An adhesive 27 and a release paper 28 are simultaneously punched out and attached to the back surface of each print body 20.

The rubber printed body 20 obtained in this way is
After peeling off, as shown in FIG.
It will be attached to the bottom of 4.

When the original date stamp is put into use and the rubber printed body 20 is impregnated with ink, the unvulcanized rubber substance 20a digs into the non-stretchable fabric 25 in advance, and the rubber printed body 20 swells and deforms due to the fabric 25. to prevent During the extraction of easily soluble substances, the intermediate molded product swells and deforms excessively due to the osmotic pressure applied to it, but when it returns to its original shape after drying, the non-stretchable fabric 25 is forcibly removed. This acts so that the hole 21 contracts just the right amount, and this ensures that the next punching of the window 21, etc., will be finished neatly without any misalignment.

The rubber printed body 20 is circular with a diameter of 2.5 cm, and the maximum height of the portion having the printed portion 22 is 2.8 m, and the height of the printed portion 22 is 1.3 mm.

The opening width of the window 21 is 5.0 mm, and the porosity is 60 to 8.
I made a 0% one.

[Another example]

Although the illustrated example is as described above, the present invention naturally includes the following design changes.

For example, the sliding frame 3 in the illustrated example is omitted, and the rubber printed body 20 is attached directly or indirectly to the lower surface of the stamp body 1, and the date changing mechanism 4 side built into the stamp body 1 is placed upwardly with respect to the stamp body 1. The date may be changed by lifting it up, that is, the rubber printing belt 11 may be rotated. Specifically, in 1986-
The forms shown in JP 114758, JP 60-117170, JP 60-117171, JP 59-19360, etc. may also be used.

In order to improve productivity, attach the back side of the rubber printed body 20 to the bottom side of the stamp body 1 using adhesive 27 using double-sided adhesive tape.
Although it is advantageous to adhere the rubber printed body 20 to the stamp body 1 with an adhesive, the present invention is particularly effective in this case.

Regarding forming the rubber printed body 20 to be porous.

This can be done using a sintering method or other known techniques.

The rubber printed body 20 may have a two-layer structure with different porosity. A non-porous rubber layer is integrally laminated on the back side of the non-stretchable fabric 25, and the rubber printed body 2 is formed through this non-porous rubber layer.
0 can also be pasted on the stamp body 1; in this case, the ink will not penetrate into the adhesive layer and will be effective in preventing 211 Zf (211 Zf) from the rubber printed body 20 from the stamp body 1.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of the main parts that most clearly expresses the content of the present invention. 2 to 4 illustrate the process of molding a rubber printed body, which is a component of the present invention, and FIG. 2 is a sectional view showing the state before vulcanization molding. FIG. 3 is a partially cutaway perspective view showing an intermediate molded product after vulcanization molding. FIG. 4 is a perspective view of the rubber printed body punched out from the intermediate molded product. Figures 5 to 7 show date stamps to which the present invention is applied, with Figure 5 being an external perspective view, and Figure 6 being a vertical front view.
FIG. 7 is a longitudinal side view. 1...Seal body. 3...Sliding frame. 4...Date change mechanism. 11...Rubber printing belt. 13/11 exit. 20...Rubber print. 20a...Rubber substance. 25...Non-stretchable fabric. 26... Intermediate molded product 2 27... Adhesive. 28...Release paper. Inventor: Kenji Fukutake Figure 1

Claims (2)

[Claims] (1) In a date stamp in which a plate-shaped rubber printed body 20 is attached to the lower end of the stamp body 1, the rubber printed body 20 (a) is formed porous to enable continuous stamping; b) A window 21 for changing the date is formed in the central part; (c) A non-stretchable fabric 25 is integrally formed as a backing on the back side that is attached to the lower end of the stamp body 1; A date stamp featuring. (2) The rubber printed body 20 is attached to the adhesive 27 on the bottom surface of the stamp body 1.
The date stamp set forth in claim 1 affixed to the date stamp.