JPH0354880Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a thermal cutter that cuts Styrofoam and other materials to be cut using a hot blade, and particularly relates to a thermal cutter that is easy to cut and has a good cut surface.

[Prior Art] Conventionally, when cutting synthetic resin foam such as Styrofoam into a predetermined shape, it has been customary to use a knife or a saw, but this method has drawbacks such as the inability to easily cut complex shapes. There is.

Therefore, some attempts have been made to thermally cut the material to be cut using a thermal blade that is heated by electricity. This type of thermal cutter has the advantage of being able to easily cut complex shapes without requiring any force.

However, if the temperature control of the hot blade is not appropriate, the cut surface of the material to be cut will melt more than necessary during cutting, and the cut surface will be in good condition and accurate cutting with dimensional accuracy may not be expected at all. Alternatively, there are problems such as insufficient melting of the cut surface of the material to be cut, making it difficult for the hot blade to pass through.

[Purpose of invention]

The present invention was developed in view of the current situation, and it is an object of the present invention to provide a thermal cutter that is easy to cut and can cut well with high dimensional accuracy.

[Summary of the idea]

The present invention uses a cutting blade and a retaining blade made of a conductive material that are arranged approximately parallel to each other in the cutting direction.
A thermal cutter that is interconnected and electrically connected, and heats and raises the temperature of both blades by passing electricity between the base ends of the two blades to thermally cut the material to be cut, the average power consumption of the retaining blade relative to the cutting blade. is set to 0.3 to 0.9, and the material to be cut can be easily cut with high precision.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a gun-shaped housing, and a switch 2 is built into the gripping part of the housing 1, and a power supply line 3 is connected from the lower end of the gripping part.
is being drawn out.

Further, as shown in FIG. 1, a plug 4 and a pilot lamp 5 are respectively attached to the tip of the housing 1, and a thermal cutter main body 6 is detachably attached to the plug 4. Then, by turning on the switch 2, the pilot lamp 5 and the heat cutter body 6 are energized.
When the pilot lamp 5 is turned on, the heat cutter body 6 is heated to rise in temperature.

As shown in FIG. 1, the thermal cutter main body 6 has cutting blades 7 in the form of strips made of the same material and the same thickness.
a and the retaining blade 7b at the required vertical interval G in the board width direction.
The cutter 7 is provided with a cutter 7 which is arranged so as to hold the blades 7a and 7b, and which is interconnected between the tips of the blades 7a and 7b to form a U-shape as a whole.
The tips of the connecting pieces 8a and 8b are each welded,
The distal ends of each of the connecting pieces 8a, 8b are removably inserted and fixed into the plug 4 to be electrically connected.

Further, as shown in FIG. 1, when the width of the cutting blade 7a is A and the width of the retaining blade 7b is B, the ratio A/B is set to 0.3 to 0.9, preferably 0.5. It is formed narrower than 7b.

That is, since the double blades 7a and 7b have the same thickness as described above, by setting the ratio A/B of the widths A and B to 0.3 to 0.9, preferably 0.5, the thickness of the cutting blade 7a is reduced. The ratio of the cross-sectional area of the retainer blade 7b to the cross-sectional area is 0.3 to 0.9, preferably 0.5, and since both blades 7a and 7b are made of the same material, the power consumption of the retainer blade 7b compared to the cutting blade 7a is reduced.
0.3 to 0.9, preferably 0.5.

Therefore, when the cutter 7 is energized, the cutting blade 7
When a is heated to, for example, 400-odd degrees, the holding blade 7b is heated to, for example, 200-odd degrees to 300-odd degrees, and an optimal temperature difference is formed between the two blades 7a and 7b. It's becoming like that.

FIG. 2 shows an electrical circuit diagram of the heat cutter according to the present invention, in which T is a transformer, the primary coil of which is connected to a power source E via the switch 2, and the secondary coil of which is connected to a power source E via the switch 2. The coil includes the pilot lamp 5, the cutting blade 7a of the cutter 7, and the retaining blade 7.
b are connected to each other.

Next, the effect will be explained.

When switch 2 is turned on and power is applied to cutter 7,
The cutting blade 7a and the retaining blade 7b of the cutter 7 are both heated and heated, but since the plate widths of the double blades 7a and 7b are mutually different and the power consumption is different between the double blades 7a and 7b, the double blades 7a and 7b are A temperature difference occurs between them.

Here, when the ratio A/B of the plate width A of the cutting blade 7a and the plate width B of the retaining blade 7b is set in the range of 0.3 to 0.9, that is, the cover power of the retaining blade 7b to the cutting blade 7a is 0.3 to 0.9. In this case, the cutting blade 7a is heated to a temperature of, for example, 400-odd degrees, while the retaining blade 7b is heated to a temperature of, for example, only 2-hundred-and-odd degrees to 300-odd degrees. In this state, by pressing the cutting blade 7a against a material to be cut (not shown) such as styrofoam, easy and good cutting can be performed with high dimensional accuracy.

That is, when the ratio A/B of the plate width A of the cutting blade 7a and the plate width B of the retaining blade 7b exceeds 0.9 (the cutting blade 7
When the power consumption of the retainer blade 7b with respect to a exceeds 0.9), in other words, the plate width B of the retainer blade 7b is greater than the cutting blade 7a
When the width is approximately equal to the plate width A of the cutting blade 7a or narrower than the plate width A of the cutting blade 7a, the temperature of the retaining blade 7b becomes relatively higher than the temperature of the cutting blade 7a.

When cutting is performed by pressing the cutting blade 7a against the material to be cut in this state, the temperature of the cutting blade 7b increases as it passes through the slit formed in the material to be cut by the passage of the cutting blade 7a. If the height is too high, the cut surfaces on both sides of the slit will melt, and the slit width will become wide, making it impossible to cut the material to be cut with accurate dimensional accuracy, and the state of the cut surfaces will also be unfavorable due to the melting.

On the other hand, the plate width A of the cutting blade 7a and the plate width B of the retaining blade 7b
When the ratio A/B is less than 0.3 (when the power consumption of the retaining blade 7b with respect to the cutting blade 7a is less than 0.3), in other words, the plate width B of the retaining blade 7b is compared to the plate width A of the cutting blade 7a. If it is extremely wide, the temperature of the retaining blade 7b will be relatively lower than the temperature of the cutting blade 7a.

When cutting is performed by pressing the cutting blade 7a against the material to be cut in this state, the temperature of the cutting blade 7b increases as it passes through the slit formed in the material to be cut by the passage of the cutting blade 7a. Because it is too low, the material to be cut on the cut surfaces on both sides of the slit will be welded to the retainer blade 7b, making it extremely difficult for the cutter 7 to pass, and the condition of the cut surfaces will also deteriorate due to the welding.

On the other hand, the plate width A of the cutting blade 7a and the retaining blade 7b
When the ratio A/B with the plate width B is set to 0.3 to 0.9 (the power consumption of the retaining blade 7b to the cutting blade 7a is 0.3 to
0.9), there is no melting of the cutting surface by the retainer blade 7b or welding of the material to be cut to the retainer blade 7b,
It is possible to cut a material with a good cutting surface. When the ratio A/B is set to 0.5 (when the power consumption of the retaining blade 7b to the cutting blade 7a is 0.5), the best cutting can be expected.

Further, the cutter 7 can be easily manufactured by pressing a plate material and is therefore inexpensive.

In addition, in the embodiment, the cutting blade 7a and the retaining blade 7b
Although we have explained the case where the double-edged blades 7a and
7b does not necessarily have to be parallel, and the desired effect can be obtained if they are substantially parallel.

FIGS. 3 to 5 each show a modification of the above embodiment, in which the shape of the cutter is changed.

That is, the cutter 17 shown in FIG. 3 has a cutting blade 17a and a retaining blade 17b, which are made of the same material and have the same thickness, and are arranged vertically at a required distance G from each other in the width direction of the plate. , 17b are interconnected to form a U-shape as a whole, and a plurality of cuts 11 are provided at predetermined intervals in the longitudinal direction on the edge of the cutting blade 17a facing the retaining blade 17b. There is. The average power consumption of this cutting blade 17a (the part with the cut 11 and the part without the cutting blade 17a)
The ratio of the power consumption of the retainer blade 17b to the power consumption averaged over the entire length of the blade 7a is set to 0.3 to 0.9, preferably 0.5.

By providing the cut 11 in the cutting blade 17a to narrow the width of the cutter blade 17a, the width of the retaining blade 17b and, in turn, the width of the cutter 17 can be narrowed, which is convenient for cutting curved surfaces. Also, depth of cut 1
1 is not provided, the rigidity of the cutting blade 17a can be ensured, and the cutter 17 as a whole can have sufficient strength.

Moreover, the cutter 27 shown in FIG.
The cutting blades 27a and 27b are arranged at a required interval G vertically in the width direction of the plate, and the tips of the two blades 27a and 27b are interconnected to form a U-shape as a whole.
The contact edge 21 with the material to be cut is cut into a wave shape as shown. As in the case of the cutter 17, the average power consumption of the retaining blade 27b relative to the cutting blade 27a is set to 0.3 to 0.9, preferably 0.5.

By cutting the contact edge 21 of the cutting blade 27a with the material to be cut into a wavy shape, this cut portion has the same effect as a saw blade, and also has a high temperature part and a low temperature part in the longitudinal direction of the cutting blade 27a. are formed alternately. Therefore, by cutting the material while reciprocating the cutter 27 in the longitudinal direction, even the material that is difficult to cut can be easily cut.

Furthermore, the cutter 37 shown in FIG. 5 is made of the same material,
Cutting blade 37a and retaining blade 37 in the form of a strip of the same thickness
The cutting blades 37a and 37b are arranged vertically at a required interval G in the width direction of the plate, and the tips of the two blades 37a and 37b are interconnected to form a U-shape as a whole. It is bent into a square wave shape. The power consumption of the retaining blade 37b with respect to the cutting blade 37a is set to 0.3 to 0.9, preferably 0.5.

Since the cutting blade 37a is bent into a rectangular wave shape, the cross-sectional area of the cutting blade 37a can be reduced and sufficient rigidity can be obtained. For this reason, the cutting edge 3
The width of the cutter 37 can be reduced by narrowing the plate width of the cutter 7b. Further, since the cutting blade 37a also has the function of a saw blade as in the case shown in FIG. 4, good and easy cutting can be expected.

In the above-mentioned embodiments and their respective modifications, the cutting blades 7a, 17a, 27a, 37a and the retaining blades 7b, 17b, 27b, 37b are made of the same material and in the form of strips of the same thickness. Although the above description has been made, the plate thickness may be different from each other, or the cross-sectional shape may be, for example, a round bar shape, or the material may be different from each other.

Furthermore, in the above embodiments and their respective modifications, the description has been given mainly of the case of cutting styrene foam, but the present invention can be similarly applied to the case of cutting synthetic resin materials other than styrene resin or foams thereof.

[Effect of idea]

As explained above, in this invention, the average power consumption of the retainer blade relative to the cutting blade is 0.3 to 0.9, so
It is easy to cut, and the material to be cut can be cut well with high precision. Furthermore, since the device configuration is simple, it is robust and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is an electric circuit diagram thereof, and FIGS. 3 to 5 are explanatory diagrams showing modifications of the first embodiment. 6... Heat cutter body, 7, 17, 27, 37... Cutter, 7a, 17a, 27a, 37a... Cutting blade,
7b, 17b, 27b, 37b...Holding blade, G...Space.

Claims (1)

[Claims for Utility Model Registration] 1. Tips of a cutting blade and a retaining blade made of a conductor, which are arranged in front and back in the cutting direction and approximately parallel to each other, are interconnected and electrically connected, and the base of the double blades is 1. A thermal cutter for thermally cutting a material to be cut by applying electricity between the ends to heat both blades to raise their temperature, characterized in that the average power consumption of the retaining blade relative to the cutting blade is 0.3 to 0.9. 2. The thermal cutter according to claim 1 of the utility model registration claim, characterized in that the average power consumption of the holding blade relative to the cutting blade is 0.5. 3. Claim No. 1 for Utility Model Registration, characterized in that the cutting blade and the retaining blade are made of the same material, and the average power consumption is adjusted by the average cross-sectional area of both blades.
The heat cutter according to item 1 or 2. 4. The thermal cutter according to claim 1 or 2, wherein the cutting blade and the retaining blade are made of different materials to adjust the average power consumption.