JP7231202B2 - cutting device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device that moves cutting means to cut a material placed on a base.

As shown in Patent Document 1, the applicant of the present application has a base (plotter board surface) on which a material is placed, and a cutter that can move the cutting blade in the front-rear, left-right, and up-down directions, and further rotate and tilt it. It proposes a cutting device that has a head and can cut materials into arbitrary shapes. With this cutting device, it is possible to input information about the cut line according to the desired cutting shape, so that the material can be cut in any shape. Here, the information about the cut line to be input is, for example, the positions of a plurality of points and the order of these points. It is specified by XY coordinates with reference to the origin. The cutting blade can then be moved through these points in a specified order to cut the material into the desired shape.

JP 2014-237215 A

By the way, the material to be cut by such a cutting device is generally placed on the base by the user of the device. That is, the material is not always placed in the same position relative to the base each time. Therefore, if the position of the placed material is misaligned, even if the cutting blade moves as set, the cutting blade will come off the material in the middle of cutting. may become Also, when using a material with an unusual outer shape, there is a concern that the cutting blade may come off the material during cutting.

An object of the present invention is to solve such problems. To provide a cutting device which prevents cutting in shape and wastes material.

The cutting apparatus of the present invention comprises: a base extending parallel to an XY plane on which a material is placed; cutting means for cutting the material; and the material placed on the base while holding the cutting means. height detection means directed toward the surface of the base; and moving the height detection means in the X and Y directions. and a control means connected to the first movement means, the height detection means, and the second movement means, wherein the control means controls the height by the second movement means. The material occupied by the material placed on the base is determined by moving the detecting means along the surface of the base and detecting the outer edge of the material based on the points of change in height obtained by the height detecting means. It identifies the area.

Such a cutting apparatus comprises input means for inputting information relating to a cut line for cutting the material into a predetermined shape, and the control means determines that the cut line fits inside the material area. When the first moving means is driven to cut the material by the cutting means, cutting of the material is not executed when it is determined that the cut line crosses the material region. It is preferable to be

Further, the cutting apparatus of the present invention comprises: a base extending parallel to an XY plane and on which a material is placed; cutting means for cutting the material; first moving means for moving the cutting means relative to the material to cut the material; height detecting means directed toward the surface of the base; and moving the height detecting means in the X and Y directions. a second moving means for moving; an input means for inputting information on a cut line for cutting the material into a predetermined shape; the first moving means; the height detecting means; the second moving means; and a control means connected to the input means, wherein the control means moves the second moving means so that the height detection means passes through a predetermined point on the cut line, and the height detection means It may be specified whether or not the cut line fits inside the material placed on the base based on the height at the predetermined point obtained in the above.

When it is determined that the cut line fits inside the material placed on the base, the control means drives the first moving means to cut the material by the cutting means. Preferably, while cutting is performed, cutting of the material is not performed if it is determined that the cut line crosses the material.

Preferably, the control means does not cut the material when the height obtained by the height detection means exceeds a predetermined value.

Further, the cutting means includes a long cutting means and a short cutting means having different lengths to the cutting edge, and the control means controls the length according to the height obtained by the height detecting means. Either one of the length cutting means and the short length cutting means is selected, and the first moving means is driven so as to cut the material by one of the selected long length cutting means and short length cutting means. preferable.

In the cutting device of the present invention, the point at which the height changes can be detected by moving the height detection means along the surface of the base. Here, when the height near the outer edge of the material placed on the base is measured, the height measured on the surface of the base is low, but the measured height on the outer edge of the material is high. That is, since it can be determined that the outer edge of the material placed on the base is located at the point where the measured height changes, the material area occupied by the material placed on the base can be specified based on the position of this outer edge. can be done.

Here, the cutting device described above is provided with input means for inputting information about the cut line, and when it is determined that the cut line exists inside the specified material region, the first moving means is driven to cut the material by the cutting means. , while not cutting the material when the cut line exceeds the material area, cutting in an unintended shape can be prevented, and the material is not wasted.

Further, the cutting apparatus of the present invention measures the height at the predetermined point by moving the height detection means so as to pass through the predetermined point on the cut line based on the information on the cut line that has been input. may be configured. Here, if the measured height at a given point is equal to the surface of the base, it can be determined that this given point is outside the material. Since it can be determined that the material exists, it is possible to specify whether the cut line fits inside the material. Then, when it is determined that the cut line fits inside the material, the first moving means is driven to cut the material by the cutting means, and when it is determined that the cut line exceeds the material, the material is cut. can be prevented from being cut in an unintended shape, and the material is not wasted.

Such a cutting device is preferably constructed so as not to cut the material if the height obtained by the height detection means exceeds a predetermined value. Since the material to be cut is generally placed on the base by the user, there is a possibility that the material used will be thicker than expected. If such a thick material is used, the cutting blade may collide with the material before starting cutting, and the cutting blade may be damaged. can do.

In such a cutting device, the long cutting means and the short cutting means having different lengths to the tip of the cutting edge are included, and the control means controls the cutting of the long cutting means in accordance with the height obtained by the height detecting means. When one of the cutting means and the short cutting means is selected and the first moving means is driven so as to cut the material by the selected one, the cutting means having a length corresponding to the thickness of the material is automatically selected. can be selected, the usability is improved.

1 is a schematic plan view of an embodiment of a cutting device according to the invention; FIG. FIG. 2 is a side view showing the periphery of the head section in the embodiment of FIG. 1; 2 is a front view of the head portion in the embodiment of FIG. 1; FIG. 2 is a side view of the head portion in the embodiment of FIG. 1; FIG. FIG. 5 is a diagram showing positions to which the height detection means is preferentially moved in detecting the outer edge of the material placed on the base. FIG. 4 is a diagram showing a method of identifying a material region by detecting an outer edge of a material placed on a base; It is the figure shown about the positional relationship of the specified material area|region and a cut line. It is the figure which showed about the method of moving a height detection means so that the predetermined point on a cutline may be passed, and specifying whether material exists based on the height of the predetermined point obtained by this.

An embodiment of a cutting device according to the present invention will be described below with reference to the drawings. Reference numeral 1 in FIG. 1 indicates an embodiment of a cutting device according to the invention. A cutting device 1 of this embodiment comprises a base 2 , a head 3 and height detection means 10 . The head 3 also holds a cutting blade (cutting means) S for cutting the material W, as shown in FIGS.

The base 2 is for placing a material indicated by symbol W. In this embodiment, the surface on which the material W is placed is parallel to the XY plane with respect to the XYZ orthogonal coordinate system shown in FIG. assumed to be extended. In this embodiment, the XY plane extends horizontally, and the Z direction is the height direction. The surface of the base 2 is formed in a rectangular shape in which the Y direction (front-rear direction) is longer than the X direction (width direction) in plan view. The surface of the base 2 is provided with suction holes for sucking and holding the material W by means of negative pressure. The base 2 also includes ancillary equipment for connecting to a power supply and an air source for driving various means provided in the cutting apparatus 1, as well as an operation unit 2a used when the user operates the cutting apparatus 1. is provided. As shown in FIG. 1, the operating portion 2a of the present embodiment is provided in the center of the width direction of the base 2 and on the front side of the user. In addition, the origin O of the coordinates of the points designated when the material W is cut into a predetermined shape by the cutting device 1 is set on the right front side of the base 2 when viewed from the user near the operation unit 2a.

Although the material W described above is formed in a flat plate shape having a rectangular shape in plan view in the illustrated example, the shape is not limited to this. Further, the material includes various materials such as paper products such as cardboard, thin synthetic resin plates or metal plates, and relatively thick polyethylene and foam materials.

Between the base 2 and the head 3, an X- and Y-direction moving means 4 and a Z-direction moving means 5 are provided. can be moved in the X-axis direction, the Y-axis direction, and the Z-axis direction. Further, the height detection means 10 is configured to be movable in the X-axis direction and the Y-axis direction, and is provided in the X- and Y-direction movement means 4 as described later in this embodiment. In this specification and the like, the "first moving means" defined as moving the cutting means is, in this embodiment, in addition to the X- and Y-direction moving means 4 and the Z-direction moving means 5, θ The directional moving means 6 and the α-direction moving means 7 correspond to this. In this embodiment, the X- and Y-direction moving means 4 corresponds to the "second moving means" defined to move the height detecting means. That is, this embodiment shows an example in which the "first moving means" also serves as the "second moving means".

The X, Y-direction moving means 4 of this embodiment includes a pair of Y-axis rails (not shown) extending in the Y-axis direction and spaced apart from the base 2 in the X-axis direction. , an X-axis frame 4a held by the Y-axis nut, and extending in the X-axis direction and extending in the Z-axis direction relative to the X-axis frame 4a as shown in FIG. , an X-axis nut 4c sliding on the X-axis rail 4b, and an X-axis movement base 4d held by the X-axis nut 4c. Although detailed description is omitted, the X- and Y-direction moving means 4 also includes driving means for moving the X-axis frame 4a and the X-axis moving base 4d, and in this embodiment, servo motors are used. are doing. Note that other motors (stepping motors, etc.) may be used. In addition, the combination of the rail and the nut is not limited to that described above, and a mechanism using a timing belt and pulley, a mechanism using a ball screw, or a mechanism using a rack and pinion may be used.

The Z-direction moving means 5 slides on a pair of Z-axis rails 5a extending in the Z-axis direction and spaced apart from the X-axis moving base 4d in the X-axis direction. It includes a Z-axis nut 5b and a Z-axis movement base 5c held by the Z-axis nut 5b. Further, the Z-direction moving means 5 includes a Z-axis motor 5d and a ball screw 5e for moving the Z-axis moving base 5c by rotation of the Z-axis motor 5d.

The head 3 includes a θ-direction moving means 6 capable of rotating the cutting blade S around the Z-axis, an α-direction moving means 7 capable of rotating the cutting blade S around an α-axis (see FIG. 4) orthogonal to the Z-axis, Vibrating means 8 for vibrating the cutting blade S in its longitudinal direction, and material pressing means 9 (see FIG. 2) for holding down the material W when the cutting blade S cuts the material W are provided.

The .theta.-direction moving means 6 includes a .theta.-rotation shaft 6b rotatably supported by a pair of bearings 6a spaced apart in the Z-axis direction, and a .theta.-axis base 6c (see FIG. 3) held by the .theta.-rotation shaft 6b. ) and The θ-direction moving means 6 rotates the θ-rotation shaft 6b, and includes a θ-axis pulley 6d attached to the θ-rotation shaft 6b and a θ-axis motor 6e for rotating the θ-axis pulley 6d via a timing belt. there is

The α-direction moving means 7 includes, as shown in FIG. 3, an α-rotating shaft 7a rotatably supported on a θ-axis base 6c, an α-axis pulley 7b attached to the α-rotating shaft 7a, and a timing and an α-axis motor 7c that rotates an α-axis pulley 7b via a belt. Furthermore, the α-direction moving means 7 includes a spline case 7d that rotates together with the α rotation shaft 7a, a spline shaft 7e that is provided so as to move forward and backward with respect to the spline case 7d, and a cutting edge S that is provided at the tip of the spline shaft 7e. It is provided with a holder 7f.

As shown in FIG. 2, the vibrating means 8 includes a crank 8a connected to the rear end of the spline shaft 7e, a shaft 8b with an eccentric cam that is rotatably supported and moves the crank 8a forward and backward, and a shaft 8b with an eccentric cam. and a vibration imparting motor 8d for rotating the vibration imparting pulley 8c via a belt (timing belt). That is, when the shaft 8b with the eccentric cam is rotated by the vibration applying motor 8d, the crank 8a vibrates with the amplitude of the eccentricity, and the spline shaft 7e to which the holder 7f is attached also vibrates, so that the spline shaft 7e is held by the holder 7f. The cutting blade S can be vibrated along the longitudinal direction.

The cutting blade S has a flat blade shape as shown in FIGS. S2 is provided. The cutting blade S is removable from the holder 7f, and is a long cutting blade (long cutting means) having a relatively long length from the portion held by the holder 7f to the cutting edge S3 at the tip, In addition to short cutting blades (short cutting means) with a short length, various cutting blades S such as a double-edged blade with the cutting edge S2 provided on both sides of the extension surface S1 and a single-edged blade with the blade edge S2 provided only on one side. can be installed.

The material pressing means 9 includes, as shown in FIG. 2, a pressing plate 9a provided near the cutting blade S, a guide 9b supporting the pressing plate 9a so as to be movable with respect to the head 3 in the Z-axis direction, and a pressing plate 9a. and an elastic body 9c for pressing against the material W.

The height detection means 10 shown in FIG. 1 is directed toward the surface of the base 2 and can measure the height of the material W placed on the base 2 . As such height detection means 10, for example, a non-contact laser type sensor using laser light can be employed. The height detection means 10 of this embodiment is attached to the X-axis movement base 4d of the X- and Y-direction movement means 4, moves in the X-axis direction and the Y-axis direction, and detects the height of the entire surface of the base 2. can be measured.

The cutting device 1 also includes an input means (not shown) for inputting information about a cut line for cutting the material W into a predetermined shape. An information terminal (computer) connected to the cutting apparatus 1, for example, can be used as such input means. In addition, the information about the cutline in this embodiment is the positions of a plurality of points on the cutline and the order of these points, and the positions of the points are based on the origin O of the base 2 shown in FIG. Specify by XY coordinates.

Further, the cutting apparatus 1 includes such X, Y direction moving means 4, Z direction moving means 5, θ direction moving means 6, α direction moving means 7, vibration means 8, height detection means 10, and input means. It has a control board (control means), not shown, to be connected. Based on the information from the height detection means 10 and the input means, the control board identifies the shape and position of the material W placed on the base 2, and the X, Y direction movement means 4 and Z direction movement means. 5. Commands can be sent to the .theta.-direction moving means 6, the .alpha.-direction moving means 7, and the vibrating means 8 to drive them individually or in conjunction with each other.

Next, a method for cutting the material W into a predetermined shape using the cutting apparatus 1 having such a configuration will be described. First, as method 1, a method of specifying the area (material area) occupied by the material W placed on the base 2 by the height detection means 10 will be described.

In Method 1, first, a step of moving the height detection means 10 to a place where the material W is likely to be placed is executed. In the cutting apparatus 1 of this embodiment, when the positions of a plurality of points on the cutting line are specified by the input means, the origin O of the base 2 is used as a reference. As shown in 5(a), it is predicted that it will often be near the origin O of the base 2. FIG. Therefore, the height detection means 10 is moved toward the origin O as shown. At this time, the height detection means 10 initially measures the height up to the surface of the base 2, but when the movement toward the origin O passes the outer edge L1 of the material W, the measured height suddenly increases. growing. Therefore, it can be estimated that the outer edge L1 of the material W is positioned at the point P1 where the height suddenly increases. Further, when the height detection means 10 located inside the material W passes the outer edge L2 of the material W and moves to the outside, the height measured by the height detection means 10 sharply decreases. Therefore, it can be estimated that the outer edge L2 of the material W is positioned at the point P2 where the height suddenly decreases. If the height detection means 10 cannot pass through the material W when the height detection means 10 is moved, it is necessary to move the height detection means 10 toward another place. The outer edge of the material W can be efficiently searched by preferentially moving toward the place where the material W is likely to be placed.

Another place where the material W is likely to be placed is the vicinity of the operation unit 2a, which is a place near the user as shown in FIG. 5(b). Therefore, the height detection means 10 may be moved toward the operation portion 2a. Considering both the possibility of being placed on the origin O and the possibility of being placed near the operation unit 2a, as shown in FIG. You may move the height detection means 10 toward. Furthermore, by repeatedly performing the cutting work, information on the position where the material W is placed by the user can be accumulated. For this reason, the material W placed this time (indicated by a solid line in FIG. 5(d)) is also different from the previously placed material W′ (indicated by a two-dot chain line in FIG. 5(d)). It is expected to be placed in a similar location as W'. Therefore, it is also possible to specify a point R that is highly likely to be placed on the basis of the accumulated information, and move the height detection means 10 toward this point R. FIG.

When detecting the outer edge of the material W, it can be found more efficiently by moving the height detection means 10 obliquely with respect to the X-axis direction and the Y-axis direction, as shown in the figure. In the initial stage of this process, by moving the height detection means 10 quickly, the outer edge of the material W can be detected early, and after the outer edge can be detected, the position of the outer edge can be detected more accurately. , the moving speed of the height detection means 10 is preferably slowed down.

After detecting the outer edge of the material W in this manner, the step of identifying the material region occupied by the material W is performed. As shown in FIG. 6A, after the points P1 and P2 where the height changes are detected by the above-described procedure, the position is changed (for example, moved in the Y-axis direction as shown in the figure, and then again diagonally) to detect another point P3, P4 where the height changes. Here, if it is known that the shape of the material W is rectangular, the inside of the straight line (the straight line extending in the X-axis direction and the Y-axis direction in this embodiment) passing through the points P1, P2, P3, and P4 A region can be identified as a material region A occupied by material W. The outer edge of the material W actually placed on the base 2 may be inclined with respect to the X-axis direction and the Y-axis direction. Therefore, specifying the material region A in this way does not significantly change the region occupied by the actual material W. Further, as shown in FIG. 6B, points P5, P6, P7, and P8 where the height changes are further detected, and a straight line passing through P1 and P5, a straight line passing through P2 and P6, and a straight line passing through P3 and P7 are detected. , P4 and P8. The number of detected points where the height changes is arbitrary, and by appropriately increasing the number of points to be detected, even if the material W has a complicated shape or the direction in which it is placed is greatly inclined. However, the material region A closer to the actual material W can be identified.

In the example shown in FIG. 6A, the straight line passing through P1 and P2 extends in the Y-axis direction, and the straight line passing through P3 and P4 extends in the X-axis direction. Depending on the direction in which the height detection means 10 moves, these straight lines may not form a rectangular shape, as shown in FIG. 6(c). In this case, as shown in FIG. 6(d), the direction of the straight line is changed as appropriate, and the material region A is specified so as to be closed in a rectangular shape without contradiction.

After specifying the material region A occupied by the material W, a step of determining whether or not the input cut line fits inside the material region A is executed. It is assumed that the cut line C of this embodiment has a shape close to a rhombus as shown in FIG. 7(a). The information about the cut line C input by the input means is the XY coordinates of the points C1, C2, C3, and C4 and the order of cutting (in this embodiment, the order of C1, C2, C3, and C4). Here, as shown in FIG. 7A, when it is determined that the cut line C fits inside the specified material region A, it is assumed that the material W can be cut in a shape close to the desired rhombus. Since it can be determined, the cutting blade S is moved along the cut line C and the material W is cut. On the other hand, as shown in FIG. 7(b), when it is determined that the cut line C crosses the material area A, cutting by the cutting blade S is not performed, for example, a warning is issued to the user to reposition the material W. to encourage As described above, according to the cutting device 1 of the present embodiment, the material is not wasted because cutting is not performed when it is predicted that the desired shape cannot be cut.

Also, in order to cut the material W as intended even in the state shown in FIG. good too.

The material W to be placed may be thicker than expected. In this case, the cutting blade S collides with the material W before it is moved to the cutting start point, and the cutting blade S is damaged. There is a risk of For this reason, if the height detected by the height detection means 10 is equal to or greater than a predetermined value, it is preferable not to cut the material W but to prompt the user to change the material W by, for example, issuing a warning. In addition, two heads 3 are provided, one head 3 is equipped with a long cutting blade S and the other head 3 is equipped with a short cutting blade S, and based on commands from the control board. Alternatively, cutting may be performed with a cutting blade S having an optimum length according to the height detected by the method. In addition to providing a plurality of heads 3, for example, cutting blades S can be automatically attached to and detached from the head 3, and various cutting blades S can be stored in a stocker, based on commands from the control board. Alternatively, the head 3 may be moved to the stocker and remounted from the already mounted cutting blade S to another cutting blade S.

According to the cutting device 1 of this embodiment, the material W can be cut into a predetermined shape by methods other than the method 1 described above. In Method 2, which will be described next, the height detection means 10 is caused to pass through a predetermined point on the cut line C, thereby specifying whether or not the cut line fits inside the material.

In method 2, first, as shown in FIG. 8A, the height detection means 10 is moved so as to pass through predetermined points (points C1, C2, C3, and C4 in this embodiment) on the cut line C input by the input means. , is performed. The cutline C of the present embodiment has a shape close to a rhombus, and the points C1, C2, C3, and C4 are located at its vertices. In the example shown in FIG. 8A, the height detection means 10 passes through points C1, C4, C2 and C3 in this order. By moving the height detection means 10 in this way, the heights at the points C1, C2, C3 and C4 are measured.

After that, a step of specifying whether or not the cut line C fits inside the material W is executed. In the example shown in FIG. 8A, the heights measured at points C1, C2, C3, and C4 on the cutline C are all higher than the base 2. In the example shown in FIG. Also, since the points C1, C2, C3, and C4 are located on the outermost side of the cutline C, it is estimated that the portions located inside these points are also higher than the base 2. Therefore, in such a case, by moving the cutting blade S along the cut line C, the material W can be cut in the desired shape. On the other hand, if the height measured at the point C3 is low, it is estimated that the material W is placed as shown in FIG. 8(b). That is, since it is presumed that the material W is placed at a position protruding from the cut line C, in this case, cutting with the cutting blade S is not performed, and a warning is issued as in the method 1 described above to place the material W. You should encourage them to fix it.

As described above, the cutting device of the present invention has been described by showing specific embodiments, but the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. Also included. For example, in the embodiment described above, cutting is performed by moving the cutting blade S with respect to the fixed material W, but the material W may be moved with respect to the fixed cutting blade S. Moreover, although the height detection means 10 is provided in the X, Y direction moving means 4 for moving the cutting blade S, it may be provided in another X, Y direction moving means provided separately. Moreover, although the height detection means 10 of the above-described embodiment is a non-contact sensor, a contact sensor that can move in the Z-axis direction may be employed. The direction in which the height detection means 10 moves can be set arbitrarily, and is not limited to the trajectory shown in the drawings.

Reference Signs List 1: Cutting device 2: Base 2a: Operation unit 3: Head 4: X, Y direction moving means (first moving means, second moving means)
4a: X-axis frame 4b: X-axis rail 4c: X-axis nut 4d: X-axis movement base 5: Z-direction movement means (first movement means)
5a: Z-axis rail 5b: Z-axis nut 5c: Z-axis movement base 5d: Z-axis motor 5e: Ball screw 6: θ direction moving means (first moving means)
6a: Bearing 6b: θ-rotating shaft 6c: θ-axis base 6d: θ-axis pulley 6e: θ-axis motor 7: α-direction moving means (first moving means)
7a: α-rotating shaft 7b: α-axis pulley 7c: α-axis motor 7d: Spline case 7e: Spline shaft 7f: Holder 8: Vibrating means 8a: Crank 8b: Shaft with eccentric cam 8c: Vibration imparting pulley 8d: Vibration imparting Motor 9 : Material pressing means 9a : Pressing plate 9b : Guide 9c : Elastic body 10 : Height detection means A : Material area C : Cut line S : Cutting blade (cutting means)
W: Material

Claims (6)

a base that extends parallel to the XY plane and on which the material is placed;
a cutting means for cutting said material;
a first moving means for holding the cutting means and moving the cutting means with respect to the material placed on the base to cut the material;
height detection means directed toward the surface of the base;
a second moving means for moving the height detection means in the X direction and the Y direction ;
A cutting device comprising: the first movement means, the height detection means, and the control means connected to the second movement means,
The control means moves the height detection means along the surface of the base by the second movement means, and detects the outer edge of the material based on the point at which the height obtained by the height detection means changes. to identify the material area occupied by the material placed on the base. An input means for inputting information on a cut line for cutting the material into a predetermined shape,
When it is determined that the cut line fits inside the material area, the control means drives the first moving means to cut the material by the cutting means, and the cut line is cut on the material. 2. A cutting apparatus according to claim 1, wherein cutting of said material is not performed if it is determined that the area is exceeded. a base that extends parallel to the XY plane and on which the material is placed;
a cutting means for cutting said material;
a first moving means for holding the cutting means and moving the cutting means with respect to the material placed on the base to cut the material;
height detection means directed toward the surface of the base;
a second moving means for moving the height detection means in the X direction and the Y direction ;
input means for inputting information about a cut line for cutting the material into a predetermined shape;
A cutting device comprising a control means connected to the first movement means, the height detection means, the second movement means, and the input means,
The control means moves the second moving means so that the height detection means passes through a predetermined point on the cut line, and based on the height at the predetermined point obtained by the height detection means, A cutting device for determining whether the cut line fits inside the material placed on the base. The control means drives the first moving means to cut the material by the cutting means when it is determined that the cut line fits inside the material placed on the base. and not cutting the material if it is determined that the cut line crosses the material. 5. The cutting apparatus according to claim 1, wherein said control means does not cut said material when the height obtained by said height detection means exceeds a predetermined value. The cutting means includes long cutting means and short cutting means having different lengths to the cutting edge,
The control means selects one of the long-length cutting means and the short-length cutting means according to the height obtained by the height detection means, and selects the selected long-length cutting means and short-length cutting means. A cutting device according to any one of claims 1 to 5, wherein either one drives the first moving means to cut the material.

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