JP3346681B2 - Cutting tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool for cutting and opening packaging bags such as confectionery bags and retort packs, and a cutting tool for cutting paper and other sheet-like objects.

[0002]

2. Description of the Related Art Conventionally, for example, a confectionary bag or a retort pack is opened using scissors or a knife.

On the other hand, an opening cutter 5 as shown in FIG.
0 (Design Registration No. 738898, No. 8
19977). This opening cutter 50 is
One end of the first member 51 and the second member 52 was formed as a connecting portion 53 integrally joined, and the other end was provided with a blade body 54 and a receiving portion 55 on the inside facing each other. Then, an object to be cut such as a packaging bag is inserted between the first member 51 and the second member 52, and the first member 51 and the second member 52 are grasped by hand and the blade body 54 and the receiving portion 55 are brought into contact with each other. The object to be cut is cut by the blade body 54 by being moved in the lateral direction in this state, and the container is opened.

[0004]

However, in the above-mentioned opening cutter 50, since the blade body 54 is made of metal, if it is used for a long period of time, the sharpness is remarkably reduced due to rust, corrosion and abrasion. There were problems such as unsanitation.

In the above-mentioned opening cutter 50, since the receiving portion 55 is flat or convex, the blade body 54 comes into contact with the receiving portion 55 at one point and is cut at only one point. There was no problem.

[0006]

In order to solve the above-mentioned problems, the present inventor grasps by hand the ceramic blade provided on one of the first member and the second member, and the other member is used. Of the blade body is set to 15 to 35 °, and when the blade body is viewed in plan view, the blade angle α is 40 to 130 ° in a triangular shape. The tip has a curved shape, the surface near the cutting edge has a center line average roughness (Ra) of 1.5 μm or less, and the portion of the receiving portion that comes into contact with the blade is 1/3 of the width A of the blade.
A concave portion having a width B of about 2/3.

Further, the blade angle β of the blade is 15 to 35.
°, and the blade included angle α when the blade body is viewed in plan is 40 to 13
0 °, and the surface near the cutting edge has a center line average roughness (Ra) of 1.5 μm or less.

[0008]

According to the present invention, since the blade body is made of ceramics, the wear resistance and the corrosion resistance can be increased.
Maintains the initial sharpness over a long period and is very hygienic. Furthermore, the provision of the recess in the receiving part allows
Since the blade body enters the concave portion during cutting, chipping of the ceramic blade body can be prevented, and the object to be cut can be sandwiched deeply to improve sharpness. Therefore, it is possible to obtain a cutting tool that is smooth and light and has excellent functionality.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

As shown in FIGS. 1 and 2, the cutting tool 1 of the present invention
Is a shape in which one end sides of the disc-shaped first member 10 and the second member 20 are integrally connected by a connecting portion 30, and the first member 1
The blade 11 and the receiving portion 21 are provided at opposing positions on the other end side inner surfaces of the first member 20 and the second member 20, respectively.

The first member 10, the second member 20, the connecting portion 30, and the receiving portion 21 are all integrally formed of an elastic material such as synthetic resin or metal, and are formed by hand with the first member 10 and the second member. 2
When 0 is pressed, the blade body 11 is elastically deformed, and the blade body 11 comes into contact with the upper portion 21.

The blade body 11 is made of ceramics.
The blade body 11 is previously bonded to a support member 12 with an adhesive or the like, and the support member 12 is bonded to the first member 10 with an adhesive or the like. By interposing the support member 12 in this manner, the blade body 11 can be easily mounted at a predetermined position. Further, a marking 12a indicating the moving direction at the time of cutting is provided on the front side of the support member 12.

When the cutting tool 1 is used, an object 40 such as a packaging bag is inserted between the first member 10 and the second member 20 of the cutting tool 1 as shown in FIG. By pressing the member 10 and the second member 20 to bring the blade body 11 into contact with the receiving portion 21 and moving the blade body 11 in the arrow direction in this state, the object to be cut 40 can be cut by the blade body 11 and opened. it can.

FIG. 3 is an enlarged sectional view showing the vicinity of the blade 11 and the receiving portion 21. As shown in FIG. / 3 to 2
A concave portion 23 having a width B of / 3 is formed. Further, when the blade body 11 is viewed in a plan view, the blade edge shape is a triangular shape having a blade angle α of 40 to 130 ° and the tip is a curved surface.
A single-sided cutting edge 13 is formed by forming a slope 15 at the tip and the oblique side.

Therefore, when the blade body 11 is brought into contact with the receiving portion 21, the blade edge 13 enters the concave portion 23, so that the blade edge 1
3 can be prevented, and the object to be cut (not shown) can be sandwiched deeply between the two. If the object is moved in the horizontal direction as it is, not only the cutting edge 13 at the tip of the blade body 11 but also
The cutting ability can be improved because it can be cut even on the hypotenuse portion.

The reason why the width B of the concave portion 23 of the receiving portion 21 is set to １ ／ to ／ of the width A of the blade body 11 is that if the width B is less than ３, the blade body 11 does not easily enter the concave portion 23. This is because the above effect is poor. On the other hand, if it exceeds 2/3, the object to be cut is bitten at the end of the blade body 11 and the end of the receiving portion 23, and the sharpness becomes poor. Further, in FIG. 3, the shape of the concave portion 23 is a curved surface, but may be a square shape or the like, as long as the concave portion 23 has a depth enough to allow the blade body 11 to enter sufficiently.

Also, the blade angle α when the blade body 11 is viewed in a plan view.
Is set to 40 to 130 [deg.] Because if the angle is smaller than 40 [deg.], The cutting edge 13 is easily broken, and if it is larger than 130 [deg.], A smooth and light sharpness cannot be obtained.

Further, as shown in FIG. 4, a cross section of the blade body 11 has a flat surface 14 and
Is a single-edged shape, but may be a double-edged shape having two slopes. Is set at 15 to 35 °, and the center line average roughness (R
a) is set to 1.5 μm or less. The vicinity of the cutting edge 13 refers to a portion of the flat surface 14 and / or the slope 15 near the cutting edge 13.

The reason for setting the blade angle β to 15 to 35 ° is 1
If the angle is smaller than 5 °, the cutting edge 13 is extremely easily chipped and the sharpness deteriorates accordingly. If the angle is more than 35 °, the sharpness sharply deteriorates. Also, the cutting edge 13
The reason why the center line average roughness (Ra) in the vicinity is set to 1.5 μm or less is that if the center line average roughness (Ra) is larger than 1.5 μm, a cut object such as a packaging bag is easily caught and sharpness is sharpened. It is because it falls.

In the above embodiment, various ceramics can be used as the ceramic forming the blade body 11, but zirconia ceramics having high strength and toughness are preferable. In particular, ZrO ₂ is a main component, and Y ₂ O ₃ , CaO,
It contains at least one of MgO, CeO _{2 and the} like as a stabilizer, and has a tetragonal crystal having an average crystal grain size of 2 μm or less.
A partially stabilized zirconia ceramic containing at least 0 mol%, preferably at least 80 mol% is suitable.

On the other hand, the receiving portion 21 is preferably made of a relatively soft material such as a synthetic resin or a metal material to prevent the blade 11 from being chipped.

In the above embodiment, the first member 10 and the second
Although the member 20 is integrally formed and elastically deformed, it may be formed separately and may have a structure in which one end is fixed so as to be displaceable. Further, the first member 1
It goes without saying that the shapes and structures of the 0 and the second member 20 are not limited to those shown in FIGS.

Further, the cutting tool of the present invention can be suitably used not only for opening packaging bags and the like but also for cutting paper and other sheet-like objects.

EXPERIMENTAL EXAMPLE With respect to the cutting tool 1 of the present invention shown in FIGS. 1 to 4, the cutting angle β of the blade body 11, the surface roughness of the slope 15 near the cutting edge 13, the cutting edge angle α, the shape of the cutting edge 13, the receiving portion 21 shape, recess 23
And the ratio of the width B of the blade body 11 to the width A of the blade body 11 was prepared as shown in Table 1. Comparative determination was made in the opening tests of aluminum, paper confectionery bags, and retort pack bags, respectively.

Here, the blade body 11 is formed of zirconia ceramics, the blade angle β is measured by a projector, and the center line average roughness (Ra) is measured by a stylus type surface roughness measuring method JIS-.
Performed according to B0601.

The results are as shown in Table 1. From Table 1,
No. In No. 1, since the blade angle β was smaller than 15 °, a large amount of chipping occurred, and the blade could not be cut immediately. No. In No. 2, since the surface of the slope 15 is rough and the shape of the receiving portion 21 is flat, the sharpness is not good. No. In No. 6, the cutting edge angle α is larger than 130 °, so that the sharpness is not good. No. 7 is slope 1
5 has a rough surface and a cutting edge angle α of less than 40 ° causes chipping, and the shape of the receiving portion 21 is also convex, resulting in poor sharpness. No. 11, the surface of the slope 15 is rough,
Since the shape of the receiving portion 21 is flat, the sharpness is not good. No. 13 has a blade angle β greater than 35 °,
Since the width B of the receiving portion 21 was the same as the width A of the blade body 11, the object to be cut was bitten and could not be cut.

On the other hand, those within the scope of the present invention were all excellent in sharpness and excellent.

[0028]

[Table 1]

Next, as a comparative example, a stainless steel blade 1 was used.
1 was prepared, and a test for comparing the lifespan was performed with the embodiment of the present invention having the blade body 11 made of zirconia ceramics. In each case, the blade angle β was 20 °, the center line average roughness (Ra) of the slope 15 was 0.5 μm, and PP
The sharpness when the C paper was continuously cut at a load of 50 gf was compared.

As shown in Table 2, the cutting performance of the metal (stainless steel) blade 11 was reduced at 400 m,
At 0 m, the blade could not be used, whereas the blade 11 made of ceramic maintained a good sharpness even after cutting at 1000 m.

[0031]

[Table 2]

[0032]

As described above in detail, according to the present invention, by grasping by hand, the ceramic blade provided on one of the first member and the second member is brought into contact with the receiving portion of the other member. And the blade angle of the blade body is set to 15 to 35 °, and when the blade body is viewed in plan, the tip angle α is 40 to 130 ° in a triangular shape and the tip is curved. In addition, the center line average roughness (Ra)
1.5 μm or less, and a concave portion having a width B of ３ to に 対 し て of the width A of the blade body in a portion of the receiving portion which comes into contact with the blade body is excellent in smoothness and lightness. It is possible to obtain a cutting tool which has sharpness, can maintain good sharpness for a long period of time, and is extremely hygienic.

[Brief description of the drawings]

FIG. 1 shows a cutting tool according to an embodiment of the present invention, wherein (a) is a plan view, (b) is a front view, and (c) is a right side view.

FIG. 2 is a sectional view taken along line XX in FIG. 1 (b).

FIG. 3 is an enlarged sectional view taken along line YY in FIG. 1 (c).

FIG. 4 is a sectional view taken along the line ZZ in FIG. 3;

FIG. 5 is a perspective view for explaining how to use the cutting tool of the present invention.

FIG. 6 is a side view showing a conventional opening cutting tool.

[Explanation of symbols]

 1: Cutting tool 10: First member 11: Blade body 12: Support member 13: Blade tip 20: Second member 21: Receiving part 22: Magnet 23: Concave part 30: Connection part 40: Cutting object

Claims (1)

(57) [Claims] The first member and the second member are grasped by hand.
With the ceramic blade provided on one of the members being displaceable so as to contact the receiving portion of the other member,
The blade angle of the blade is 15 to 35 °, and the blade is flat.
When viewed, the tip angle is a triangular shape with a bevel angle α of 40 to 130 °
Is curved and the surface near the cutting edge is center line averaged.
The roughness (Ra) is set to 1.5 μm or less, and the portion of the receiving portion that comes into contact with the blade is 1/3 to 2 /
A cutting tool for opening a packaging bag, comprising a concave portion having a width B of 3.