JPS599830Y2 - Cutter blade device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutter blade device for cutting tapes such as film, cloth, paperboard, etc. into narrow widths of fixed size.

Conventionally, a cutter blade device configured as shown in FIGS. 1 and 2 has been known as an example of a device for cutting the tape as described above.

That is, in the figure, 12 and 1b are alloys arranged facing each other, and each alloy 1a and 1bJ2 has upper blades 2a and 2b.
is fixed with bolt 3.

As shown in the figure, the upper blades 2a and 2b have an arcuate upper surface, and are provided with through holes 4a and 4b such that the height of the open end on the opposing sides is lower, and the through holes Cutting blades 5a, 5b are provided at the upper edges of the opening ends of 4a, 4b.
It is a form of expression.

By moving the lower blade 7, which has cutting edges 6a and 6b formed on both edges of the upper surface, up and down between the upper blades 2a and 2b,
The object to be cut 8 inserted into each of the through holes 4a, 4b is sheared into a fixed size by the cooperative action of each of the cutting blades 5a, 5b, 6a, 6b.

However, in the conventional cutter blade device having the above structure, as the lower blade 7 is moved up and down, both or one of the upper blades 2a, 2b and the lower blade 7 gradually wears out, causing damage to each of them. It often happens that the gap between the upper blades 2a and 2a becomes large, making shearing work difficult.
The gap between the blade 2b and the lower blade 7 had to be adjusted frequently.

In addition, the upper blade 2 in the conventional cutter blade device
Generally, the upper blades 2a and 2b are formed of tool steel, but if they are formed of cemented carbide instead of tool steel in order to improve their durability and sharpness, the conventional upper blades 2a and 2b Since the upper surfaces of the holes 4a and 4b form an arcuate surface, the cutting edge 5
Since a and 5b are curved, it is difficult to grind them.
There were problems such as a rise in prices.

The present invention has been developed in view of the above circumstances, and allows for easy adjustment of the gap between the upper and lower blades, and also enables easy manufacturing even when cemented carbide is used as the material for the upper blade. The object of the present invention is to provide a cutter blade device that can perform the following functions.

Embodiments of the present invention will be described below with reference to the drawings.

3 and 4 show the first embodiment of the present invention. In these figures, reference numerals 10a and 10b are base metals placed opposite each other, and the upper surface of one base metal 10a is One end is cut out in a rectangular shape so that it is flush with the top surface of the other base metal 10b, and a mounting seat 11a is formed therein, and the top surface of the other base metal 10b is also shaped like the mounting seat 11a. b.

An elastic member 12a is provided on each mounting seat 11a, llb.
, 12b, and are mounted with bolts 14.

The elastic members 12a, 12b are made of rubber, for example, and as shown in FIG.
The cross-sectional shape is wedge-shaped with a predetermined angle α such that the thickness becomes thinner on the side opposite to 0b.

One of the upper blades 13a has a blade base metal 15a having a U-shaped cross section, and a cross section whose lower surface is inclined at a predetermined angle θ so that one side in the longitudinal direction (the left side in FIG. 3) descends. A blade 16a formed of cemented carbide in a substantially U-shape
It consists of a blade base metal 15a and a blade 16a.
The upper blade 13a is connected to the blade 16a, the blade base metal 15a, and the elastic member 1 so as to form a through hole 17a by facing each other.
It is mounted on the mounting seat 11a with a bolt 14 that passes through the base metal 10H and screws into the base metal 10H.

The cutting edge 18a is formed at the upper edge of the right opening end of the through hole 17H in FIG. The H sharpness is improved.

Further, the other upper blade 13b has a blade base metal 15b having a U-shaped cross section, and a substantially U-shaped cross section whose lower surface is inclined at a predetermined angle θ so that one side in the longitudinal direction (the right side in FIG. 3) is downwardly inclined. The blade 16b is made of cemented carbide and is made of cemented carbide, and the blade 16b and the blade base metal 15b are joined to form a through hole 17b by facing each other. This upper blade 13b is the blade 16
b. It is mounted on the mounting seat 11b with a bolt (not shown) that passes through the flade base metal 15b and the elastic member 12b and is screwed into the other base metal 10b.

The cutting edge 18b is formed at the upper edge of the left opening end of the through hole 17b in FIG.
8b sharpness is improved.

Therefore, the pair of upper blades 13a, 13b
Since 2a and 12b are wedge-shaped, they are inclined in opposite directions at a predetermined angle α so that the distance between them becomes narrower toward the top in FIG. Members 12a, 12b
The cutting edges 18a and 18b are elastically displaceable so as to be separated from each other against the elastic force of the cutting edges 18a and 18b, and the cutting edges 18a and 18b are inclined in different directions as shown in FIG.

A lower blade 19 is provided between the base metals 101 and 10b so as to be movable up and down.

The lower blade 19 has a width approximately equal to the interval between the base metals 101 and 10b, and has cutting blades 20a and 2 on both sides of its upper end.
A plate-shaped cutting blade piece 21 a made of cemented carbide with a shape of 0b,
21b is fixed, and as it moves upward, the cutting blades 20a, 20b and the upper blades 13a, 13M)
The cutting blades 18a and 18b are configured to shear the object T.

The upper left and right side surfaces of the cutting edges 20a and 20b are finished to a surface roughness of 0.4S or less, similar to the blades 16a and 16b, to improve the sharpness of the cutting edges 20a and 20b.

Next, the operation of the cutter blade device constructed as described above will be explained.

First, cut the object T such as film or cloth with each upper blade.
The lower blade 19 is inserted into the through holes 17a and 17b of the blades 3a and 13b, and then the lower blade 19 is raised.

Then, the object to be cut T is pushed up by the lower blade 19,
At the same time, since the upper blades 13a, 13b are slightly inclined toward the lower blade 19 side, each cutting edge piece 21a, 21b and each blade 16a, 16b are in surface contact with each other, and the workpiece T is Blades 18a, 20a, 18b, 20b
Sheared by the cooperative action of

In this case, each upper blade 13a 13b is connected to each cutting edge 18a
, 18b are inclined in different directions, so that the object T can be cut by one of the cutting blades 18a, 20a.
The cutting blades 18b and 20b start shearing from the left side in the figure and from the right side with the other cutting blades 18b and 20b, and as a result, the object T is sheared without causing lateral displacement, and the cutting load is reduced.

Further, each of the upper blades 13a, 13b receives lateral pressure as the lower blade 19 rises, and tilts left and right against the elastic force of the elastic members 12a, 12b interposed at the lower part of each. When the lower blade 19 descends, each upper blade 1
3a, 13b return to the original state by the elastic members 12a, 12b, so the upper blades 13a, 13b
The lateral pressure between the upper blade 19 and the lower blade 19 is always kept constant, and the upper blade 1
There is no need to adjust the gap between 3 a, 13 b and the lower blade 19.

Next, a second embodiment will be described with reference to FIGS. 5 and 6.

Note that this embodiment is different from the upper blade 13a in the first embodiment.
, 13b in a different manner, and has a different structure or is substantially the same as the first embodiment, so the same parts are denoted by the same reference numerals in the figures and their explanation will be omitted.

That is, the mounting seat 11a' formed at one end of the upper surface of one base metal 10a is inclined at a predetermined angle α toward the lower blade 19,
In addition, a mounting seat 11 formed on the top surface of the other base metal 10b
b' is also inclined at a predetermined angle α toward the lower blade 19 side.

Further, bolt holes 22a, 22b are formed on both sides of each upper blade 13a, 13b, and the diameter becomes smaller at the lower part.
1l b' and its bolt hole 2
A washer 2 is placed between the stepped portions of 2a and 22b and the head of the bolt 14.
3 and the spring 24 and screwing the bolt 14 onto the base metals 10a and 10b, the base metal 101
, 10b.

Therefore, even in the cutter blade device having the above structure, by raising the lower blade 19, each upper blade 13a,
13b is pushed by the lower blade 19 and expands, and by lowering the upper blade 19, the spring 240
The elastic force returns to the original state, and therefore the upper and lower blades 13a,
While the lateral pressure between 13b and 19 is kept constant,
There is no need to adjust the gaps between the blades 13a, 13b, 19 to account for such wear.

As explained above, according to the cutter blade device of the present invention, the pair of upper blades are tilted in opposite directions so that the distance between them gradually narrows toward the tip in the direction of movement of the lower blade during shearing. At the same time, they are mounted so that they can be elastically displaced in the directions toward and away from each other, and the cutting edges of the upper blade are tilted in opposite directions, so even if the upper and lower blades wear out, there will be no gap between them. Therefore, the cutting work can be performed in good condition at all times, and it is possible to prevent the workpiece from shifting laterally during cutting, and at the same time, the cutting load can be reduced, etc. .

[Brief explanation of the drawing]

Fig. 1 is a partially omitted longitudinal sectional front view showing a conventional cutter blade device, Fig. 2 is a partially omitted sectional view taken along the line II-II, and Fig. 3 is a partially omitted longitudinal sectional view showing a conventional cutter blade device. A longitudinal front view, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3,
FIG. 5 is a partially omitted vertical sectional front view showing a second embodiment of the present invention, and FIG. 6 is a sectional view taken along the line VI--VI in FIG. 10a, 10b... base metal, 12a, 12b...
...Elastic member, 13a, 13b...Top blade,
17a, 17b...through hole, 18a, 18b...
... Cutting blade, 19 ---- Lower blade, 20a, 20
b... Cutting blade, 24... Bent spring.

Claims (1)

[Scope of utility model registration request] A pair of upper blades with a cutting edge formed on the edge of one opening end of the through hole are mounted on the base metal with the cutting blades facing each other, and a A cutter blade configured to move a lower blade having a pair of cutting blades that cooperates with the two cutting blades to shear an object to be cut that has been inserted into a through hole of the blade between the pair of upper blades. In the device, the pair of upper blades are tilted in opposite directions so that the distance between them gradually narrows toward the front in the direction of movement of the lower blade during shearing, and the upper blades are elastically moved toward and away from each other. A cutter blade device, which is displaceably mounted on the base metal, and further has cutting edges of a pair of upper blades inclined in opposite directions.