JPS6348678B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cutting machine for cutting sheet materials such as cloth, paper, or leather. The present invention also relates to the structure of blades for cutting into a desired shape by selectively driving these blades.

[Conventional technology]

By arranging the cutting edges of many small blades in a mesh pattern and selectively protruding the blades at the required locations using an ejection drive source, the desired sheet material such as fabric, paper, or leather can be produced. In order to improve the precision of the shape, it is desirable that the machine that cuts the material be equipped with as many small blades as possible.

FIG. 6 is a partially cutaway perspective sectional view showing an example of the arrangement of conventional blades used in a sheet material cutting device. The cutter 1 has a cutting edge 6 at one end and a push rod 2 at the other end that transmits a pressing force from a drive unit for protruding the cutter (not shown). A large number of them are arranged within the guide frame 3.

The guide frame 3 has a cutter installation groove 4 with a groove width W and a groove depth L ₁ , and a push rod 4 with a diameter d and a depth L ₂ for inserting the push rod 2 and connecting it to an external drive unit for protruding the cutler. A rod insertion hole 5 is provided, and a holding frame 7 for holding the cutter 1 is further provided on the outer periphery.

The dimensions of the cutter groove 4 and the push rod insertion hole 5 depend on the material and thickness of the sheet material, the required cutting accuracy, etc., but generally the groove width W = 0.3 to 1 mm.
Groove depth L ₁ = approx. 20 mm, diameter d = 0.3 to 1 mm, depth L ₂
= approximately 20mm.

Fig. 7 is a diagram to make it easier to understand the arrangement example shown in Fig. 6. Fig. 7a is a top view of Fig. 6, and Fig. 7b is a sectional view taken along the line A--A of Fig. 7a. , FIG. 7c is a bottom view of FIG. 6. In this example, four cutters 1 constitute a square unit mesh, and the cutter 1 housed in the cutter placement groove 4 is connected to the adjacent cutter 1.
are in light contact with each other, and no gap is created between the cutting edges 6.

FIG. 8 is a partial side sectional view showing the state of sheet cutting by the sheet material cutting device shown in FIG. 6;
A device shown in FIG. 6 is fixed to a sheet material 8 laid on a plate surface 9 with the cutting edge 6 side facing it, and the blade 1 at the position to be cut is selected and penetrates the guide frame 3. The protruding push rod 2 is pressed downward by a blade protrusion drive unit (not shown), and the blade 1 is penetrated into the sheet material 8 to cut it.

In this example, a square unit mesh is made up of four cutters 1, but the shape of the mesh is not limited to this; for example, a regular hexagonal unit mesh is made up of six cutters 1. There are many types of shapes.

[Problem that the invention seeks to solve]

In the conventional sheet material cutting device as described above, when the blade 1 is arranged so that the ridgeline of the cutting edge 6 of the blade 1 forms various mesh shapes, the blade arrangement groove 4 and the push rod insertion hole are 5 had to be integrally and precisely machined into the same member of the guide frame 3.

The cutter groove 4 is machined by a metal saw, wire cut, or electrical discharge machining, and the push rod insertion hole 5 is machined by a drill or electrical discharge machining.

Machining of the cutter groove 4 with a metal saw is performed in the 9th step.
As shown in the enlarged cross-sectional views of the cutter arrangement grooves in FIGS. a and b, burrs 10 are generated at the openings of the grooves and at the intersections of the grooves, and if left as they are, they will cause problems when the cutter 1 is installed and when moving up and down. Therefore, sufficient deburring work is required, which significantly reduces the effectiveness of the work.

In addition, since runout occurs in the metal saw during machining, the groove width W increases unevenly, and when the cutter 1 is installed, as shown in the enlarged bottom view of Fig. 10,
Clearances Δ ₁ and Δ ₂ occur between the blade 1 and the groove width W, and the cutting edges 6 of the adjacent blades 1 do not come into continuous contact, resulting in uncut portions of the sheet material 8 and malfunction of the blade 1. I was getting used to it.

On the other hand, in machining by wire cutting, the groove width W increases unevenly due to the concentration of discharge energy, and the first
As shown in the enlarged cross-sectional view of the groove in Figure 1, the groove depth is particularly
Since the increase is significant in the middle part of L ₁ , the cutter 1
When cutting sheet material by arranging , the center line c' of the blade 1 is tilted from the original center line c, and the cutting edge 6 shifts to the desired cutting line, resulting in uncut parts of the sheet material and poor cutting accuracy. In addition to deterioration, this was also a cause of malfunction and cutting damage of the cutter 1.

Furthermore, when drilling the push rod insertion hole 5, the drill wears out severely due to the small diameter and deep hole drilling.
It is necessary to manage the dimensions of the drill and to frequently replace the drill, which in some cases may cause the hole to become bent or the drill to break, resulting in a significant decrease in work efficiency.

Furthermore, when performing electric discharge machining to form the push rod insertion hole 5, a long electrode with a small diameter is used, which causes vibrations in the electrode, creating problems in protection and dimensional control of the electrode.

As explained in detail above, forming the guide frame 3 by integrally precision machining the cutter groove 4 and the push rod insertion hole 5 in the same member has some problems even if various machining methods are used. Ta.

That is, when trying to make the guide frame 3 larger in order to further expand the cutting area, it takes a huge amount of time to process the guide frame 3, and in some cases, the material for the guide frame 3 must be loaded onto a processing machine. In some cases, it was impossible to even produce the product.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and is aimed at reducing uncut edges of sheet materials, deterioration of cutting accuracy, malfunctioning of blades, and damage caused by the guide frame, which is a blade installation member, in sheet material cutting devices. The purpose is to avoid such occurrences.

[Summary of the invention]

Based on this object, the present invention forms a large number of blades having a single shape, and by arranging these blades in combination, the positions of the blade members (described later) can be maintained among each other. The cutter member has a rectangular cross section that can fill a plane without gaps by combining a plurality of pieces, and the length of one diagonal of the rectangle is equal to the length of one side of the unit mesh. It uses a knife with diagonal cutting edges.

For example, a case where the cutting edge of the cutter forms a square unit mesh and a case where a regular hexagonal unit mesh is formed will be described. FIG. 5a shows the cross-sectional shape of the cutter when the unit mesh is square, and FIG. 5b shows the cross-sectional shape of the cutter when the unit mesh is regular hexagonal.

When the unit mesh is square, as shown in Fig. 5a, a line from _each vertex a1 to a4 of the square consisting of four cutting edges _{A1 to A4 to} the center point P of the square. pull. For example, for cutting edge A ₁ , the apex
Lines and cutting edges from a ₁ and a ₄ respectively toward center point P
A ₁ creates a triangle Pa ₁ a ₄ , but this triangle
Invert Pa ₁ a ₄ using the cutting edge A ₁ as the object line to obtain a square P ₁ a ₁ Pa ₄ . If this quadrangle P ₁ a ₁ Pa ₄ is used as the cross-sectional shape of the blade, it is possible to fill the plane without any gaps with this cross-sectional shape.

Similarly, if the unit mesh is a regular hexagon,
As shown in Fig. 5b, draw a line from each vertex a' ₁ to a _{' 6} of the regular hexagon formed by six cutting edges A' ₁ to A' ₆ to the center point P' of the regular hexagon. . For example, cutting edge
For A′ ₁ , from the vertices a′ ₁ and a′ ₆ , respectively, the center point
A triangle P′a′ ₁ a′ ₆ is formed by the line toward P′ and the cutting edge A′ ₁ , but by inverting this triangle P′a′ ₁ a′ ₆ with the cutting edge A′ ₁ as the object line, a quadrilateral P is created. ′ ₁ a′ ₁ P′a′ ₆ is obtained. If this square P′ ₁ a′ ₁ P′a′ ₆ is the cross-sectional shape of the cutter, then
This cross-sectional shape allows the plane to be filled without any gaps.

As explained using the above two examples, in a sheet material cutting device in which blades having linear cutting edges whose length is equal to the length of one side of a unit mesh are arranged in a mesh shape, a plurality of blades can be combined. The cutter member has a rectangular cross section that can fill a flat surface without any gaps, and the cutting edge is formed on the diagonal of one end of the cutter member, the length of one diagonal of the rectangle being equal to the length of one side of the unit mesh. By manufacturing a large number of cutlery tools and assembling them and using a holding member to hold the position of the cutting edge at the outermost periphery of the cutter member, the position of the cutting edge can be adjusted between the cutter members except for the outermost periphery. It can be configured to hold.

〔Example〕

An example in which the unit mesh is a square will be described. FIG. 4 is a perspective view of an embodiment of a blade for a sheet material cutting device according to the present invention. Knife 1'
A cutting edge 6' is formed at one end of a rod-shaped member having a rectangular cross-sectional shape as explained in FIG. 5a, on a diagonal line of the rectangular cross-section. The blade thickness S of the cutting edge portion is formed to a desired length H depending on the thickness of the sheet material, etc., and a push rod 2 is connected to the other end.

FIG. 1 is a partially cutaway perspective view showing an example of the arrangement of the cutter according to the present invention. The cutting edges 6' of the cutter 1' shown in FIG. 4 are combined to form a square mesh, and the outermost portion is held by a holding frame 7'.

Figure 2 is a diagram to make it easier to understand the arrangement example shown in Figure 1. Figure 2a is a top view of only the cutter part in Figure 1, and Figure 2b is a - A sectional view taken along the line B, and FIG. 2c is a bottom view of only the cutter portion of FIG. 1.

Combining many blades 1' with square cross sections,
The push rod 2' side is arranged upward and the cutting edge 6' side is arranged downward, and the cutting edges 6' are closely arranged so as to form a square mesh.

Figure 3 is a diagram showing the state of the knife during cutting work.
FIG. 3a is a top view of the cutter, and FIG. 3b is a side view showing only the vicinity of the operating cutter. Among the many blades 1' disposed with cutting edges 6' facing the sheet material 8 laid on the plate surface 9, the blade 1' at the position facing the position to cut into the desired shape is
The sheet material 8 is cut by pushing the push rod 2' downward by a blade protruding drive unit (not shown) and penetrating the sheet material 8.

Although the embodiment in which the unit mesh is square has been described in detail above, the same applies to the case of unit meshes of various shapes in addition to the case of regular hexagonal unit meshes explained in FIG. 5b. Can be done.

〔Effect of the invention〕

According to the present invention, the guide frame, which is a conventional component, can be removed by providing the blade itself with the function of the guide frame, which is a component of the blade installation portion of the sheet material cutting device. That is, all costs related to the guide frame, such as material costs and processing costs, are eliminated, making it possible to greatly reduce costs.

In addition, in configurations using conventional guide frames, the placement accuracy of the blades was regulated by the processing accuracy of the guide frame, resulting in uncut sheet material, reduced cutting accuracy, blade malfunctions, and breakage. However, according to the present invention, the cutting edges are formed on the diagonal of the rectangular cross section forming the cutter, so that the adjacent cutting edges are It is possible to reliably contact each other, prevent uncut portions of the sheet material, and significantly improve cutting accuracy.

Furthermore, since the cross-sectional area of the cutter increases, its rigidity increases, and malfunction and breakage of the cutter can be prevented. Furthermore, since the number of blades can be easily increased by including a drive unit for protruding the blades, it is possible to easily expand the effective cutting area.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an example of the arrangement of the cutter according to the present invention, Fig. 2 a is a top view of only the cutter portion of Fig. 1, and Fig. 2 b is taken along line B-B of Fig. 2 a. 2c is a bottom view of only the blade part in Figure 1, Figure 3 is a diagram showing the state of the blade during cutting work, and Figure 3a is a top view of the blade part. Diagram b
4 is a perspective view of an embodiment of the blade for a sheet material cutting device according to the present invention; FIG. 5a is a side view showing only the vicinity of the operating blade; FIG. is a diagram showing a cross-sectional shape of a cutter when the unit mesh is a regular hexagon. FIG. 6 is a partially cutaway perspective sectional view showing an example of the arrangement of conventional blades used in a sheet material cutting device, and FIG. 7a
is the top view of Fig. 6, and Fig. 7b is the A-A of Fig. 7a.
7c is a bottom view of FIG. 6;
FIG. 8 is a partial side sectional view showing the state of sheet cutting by the sheet material cutting device shown in FIG. 6, and FIG. 9a
10 is an enlarged bottom view, and FIG. 11 is an enlarged sectional view of the inside of the groove. 1, 1'...Cutter, 2, 2'...Push rod, 3...Guide frame, 4...Cutter installation groove, 5...Push rod insertion hole, 6,6'...Cutting edge, 7,7'...Holding frame , 8... Sheet material, 9... Board surface, 10... Burr.

Claims (1)

[Claims] 1. In a sheet material cutting device in which the cutting edges of a blade having a linear cutting edge whose length is equal to the length of one side of a unit mesh are arranged in a mesh shape, it is possible to fill a flat surface without gaps by combining a plurality of blades. A cutting edge is formed on the diagonal of one end of the cutter member, and the length of one diagonal of this quadrangle is equal to the length of one side of the unit mesh, and the cutting edge is formed between the cutter members. A blade for a sheet material cutting device, characterized in that the blade is configured to maintain the position of the blade.