JPS5822235B2 - Underlay for cutting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an underlay that is placed on the underside of paper, film, etc. when cutting the paper, film, etc. using a cutter knife. This paper relates to an underlay that makes the lines and patterns clearly stand out and is suitable for tracing and cutting.

Regarding such an underlay, the inventor of the present invention has previously filed an application as Japanese Patent Application No. 53-31196.
Although this device itself has some usefulness, the present invention is an improved structure that is more suitable for practical use.

By the way, an underlay made by laminating a rubber sheet onto a substrate made of wood or other material is well known.This underlay has the effect of closing the cuts due to the elasticity of the rubber sheet, but it is also used to cut paper, film, etc. into an appropriate shape. In this case, it is difficult to project light from the underside of the underlay to highlight lines and patterns and trace them using conventionally known underlays.

In order to provide an underlay suitable for such uses, simply constructing the substrate and the elastic sheet from semi-transparent materials has the following problems.

That is, in FIG. 1, reference numeral 1 indicates a substrate, and reference numeral 2 indicates an elastic sheet laminated on the substrate 1, both of which are made of a milky white semi-transparent synthetic resin.
Even if the cuts 3 made on the surface of the elastic sheet 2 with a cutter knife are closed due to the resilience of the elastic sheet 2, the translucency is impaired.

For example, when viewed from the eye position 4 shown in the figure, the cut 3 appears loosely as a band-shaped shadow, which significantly impairs the appearance of the underlay and is easily confused with the trace line, making it extremely difficult to use. becomes.

In order to solve the above problem, in the above patent application,
By uniformly printing minute semi-transparent circular marks on the surface of the elastic sheet, they were able to interrupt the band-shaped shadow lines caused by the cuts 3 and make them difficult to see. However, in the present invention, by using a grid scale as the mark that blocks the shadow line, it is possible to block the shadow line and at the same time to use it as a guide or dimension standard for cutting work.

Other aspects of the present invention are similar to the inventions of the patent application mentioned above, such as making it impossible to tactilely sense the cut lines that protrude on the surface of the elastic sheet due to the cut ζ, and making it difficult for the adhesive to transfer to the underlay side. Have a purpose.

The basic structure of the cutting underlay according to the present invention, as shown in FIGS. 2 to 4, is that an elastic sheet 2 is pasted on a substrate 1, and both are made of a semi-transparent material, or one of them is made of a semi-transparent material. transparent,
The other half is made of a translucent material to make the whole translucent.

A grid scale 5 is formed on the surface of the elastic sheet 2 by silk screen printing.

Although the grid scale 5 has a lower light transmittance than the substrate 1 and the elastic sheet 2, it is formed by narrow lines 6 having a light transmittance that does not interfere with the semi-transparent property.

When the grid scale 5 is made semi-transparent in this way, the light from below the underlayment is not completely blocked by the grid scale, so
Tracing work becomes easier.

When cuts 3 are made in the underlay with the above structure, when viewed from the eye position 4 in FIG. 2, the grid scale 5 has lower light transmittance than the substrate 1 and elastic sheet 2, so the line The band-shaped shadow of the cut 3 is blocked, and the shadow is fragmented in both the depth and length directions and appears to the eye, and the shadow as a whole is blurred, so it does not become an eyesore. .

An example of the grid scale 5 is as follows.

Each line 6 has a vertical and horizontal gap of 2 mm, and the width of the line in 2 mm units is approximately 0.
．． 3, the width of the line in IC'r/L is approximately 0.5, 51
The width of the unit line is about Q, 7 mm, and the total area of each line 6 is preferably 30 to 40% per unit surface area of the elastic sheet 2 on which the grid scale 5 is applied.

If it is less than 30, the effect of blocking the shadow line of the cut 3 will be weakened, and if it is more than 40, the light transmittance will be poor and it will be difficult to trace.

The one shown in FIG. 5 further enhances the above-mentioned effect, in which fine irregularities γ are embossed on the surface of the elastic sheet 2, and the grid scale 5 is formed on this irregular surface. be.

In this case, the light ray 8 from below the substrate 1 is diffusely reflected by the uneven surface, and the diffusely reflected light 8 serves to erase the band-shaped shadow caused by the cut 3.

Therefore, the shadow of cut 3 is blurred even more than the above-mentioned one,
This means that there is virtually no hindrance to tracing work.

Further, the unevenness 7 has the following effect.

That is, when the elastic sheet 2 is smooth, a slight bulge 9 remains at the cut 3 as shown in FIG.
By forming the ridge 9 to have the same size as the bulge 9, it becomes difficult to distinguish between the bulge 9 and the unevenness 7, and the cut line becomes undetectable.

Of course, the unevenness γ must be so small that it does not impair the flatness of the surface of the elastic sheet 2.

As shown in the enlarged view of FIG. Including quadruple depressions.

Therefore, when an adhesive such as glue is applied to one side of a sheet to be cut, such as paper, and this coated surface is placed on an underlay and then cut, the adhesive will not be present in the four-fold concave area formed by line 6. Since it is difficult to contact, it is difficult to transfer to the underlay side, and therefore, the cut piece can be pasted on the holder 5, that is, on the holder or other object without adding an adhesive.

Next, in another embodiment shown in FIG. 6, the elastic sheet 2 has two layers, an upper layer sheet 2a and a lower layer sheet 2b, and
is made of a material that is thinner than the lower layer sheet 2b and has a higher expansion/contraction ratio.

The knife cut 3 generally has a 7-shape shape that is wide on the top side of the sheet 2 and narrows toward the bottom side.

In order to close such a cut 3 with the resilience of the sheet itself, the cut 3 can be more reliably closed if the upper layer sear-2a has a higher expansion/contraction ratio than the lower layer sear 1-2b.

If the twisted elastic sheet 2 is so thick that the cuts 3 do not reach the substrate 1, the tip of the knife is likely to be inclined, and diagonal cuts 3' are likely to be made as shown in FIG.

Therefore, if the ends of the cuts 3' come into contact with each other, the sheet piece 10 between the two cuts may be cut off.

Therefore, the sheet 2 should not be too thick, and after various experiments, it was found that a thickness of about 1 mm is most suitable.

In the case of FIG. 6, the specific numerical values are as follows.

The thickness of the upper layer sheet 2a is 0.15 to 0.3, and the thickness of the lower layer sheet 2b is 0.8 to 0.7.However, the material of each sheet is soft vinyl chloride.

In the range of the above numerical values, the cut 3 will surely reach the substrate 1f as shown in FIG. 6, so the tip of the knife will be stable.
It has been found that the cuts 3 have a low tendency to be oblique, and therefore the percentage of cutouts as in the sheet piece 10 of FIG. 1 is low.

A groove-like stripe 1 in one direction or in a cross direction is formed on the bottom surface of the substrate 1.
By placing a large number of substrates 1, even if the substrate 1 is heated by the projection of the light beam from the f direction, a gap is formed between the substrate 1 and the tracing table due to the stripes 11, and air flows through this gap, so that the substrate 1 temperature rise can be prevented.

Therefore, it is possible to eliminate the tendency of the entire underlayment to curve, which tends to occur when the temperature difference between the substrate 1 and the elastic sheet 2 is large.

As described above, the present invention uses the structure set forth in claim 1 to convert the shadow line by the cut 3 to the line 6 of the grid scale 5.
Due to the blocking effect, it is possible to erase intermittently, and at the same time, there is an effect that the grid scale 5 can be used as a reference for cutting work.

In the case of the embodiment described in claim 2, in addition to the above-mentioned effect, there is an effect that the protuberance 9 caused by the cut 3 can be eliminated by the unevenness γ.

Furthermore, in the case of the embodiment described in claim 3, in addition to the effect of claim 1, there is an effect of reliably closing the incision 3.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged sectional view of a cutting underlay for explaining the problems of the prior art of the present invention, FIG. 2 is a partially enlarged sectional view of the cutting underlay of the present invention, and FIG. 3 is a partially enlarged sectional view of the cutting underlay of the present invention. An abbreviated perspective view, FIG. 4 is an enlarged perspective view showing a part of FIG. 3, and FIGS. 5 and 6.
The figures are partially enlarged sectional views showing other embodiments, and FIG. 1 is a partially enlarged sectional view of a cutting underlay for explaining the problems of the prior art of the present invention. 1...Substrate, 2...Elastic sheet, 2a
...... Upper layer sheet, 2b... Lower layer sheet, 3... Cut, 5... Square scale, 6.
... Line, 1 ... Unevenness.

Claims (1)

[Claims] 1. In a cutting underlay in which an elastic sheet is laminated on a substrate, the entire underlay is semi-transparent, and the surface of the elastic sheet has a semi-transparent light transmittance lower than that of the entire underlay. 1. An underlay for cutting, characterized in that a grid scale is formed by printing the lines of , and a number of groove-like stripes for air circulation are formed on the back surface of the substrate. 2. An underlay for cutting according to claim 1, wherein the entire surface of the elastic sheet is embossed with minute irregularities. 3. The cutting underlayment according to claim 1 or 2, wherein the elastic sheet is composed of two layers, and the upper layer sheet has a higher expansion/contraction ratio than the lower layer sheet.