JPH06304894A - Method and device for cutting sheet material - Google Patents

Abstract

PURPOSE:To neatly cut a corner even without drawing out a cutting edge from a sheet material. CONSTITUTION:A cutting edge 19 is advanced on a cut line 21 and placed in a condition (1) that an edge point passes a corner 20. In this way, a cut in part of extending the cut line 21 is formed in a cutting direction d21. Next, the cutting edge 19 is returned back to a position (2) that the edge point is positioned in the corner 20. Then, the cutting edge 19, while retracted, is angularly displaced to a position (4) on the extension of a cut line 22 in a direction d22 via a condition (3). The cutting edge is advanced in the direction d22 from the condition (4), to cut the cut line 22 from the corner 20. As a result, a cut in shown as a cutting condition 23 is generated, but the cut line 22 can be neatly cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material cutting method and apparatus for cutting sheet materials such as cloth into an acute angle, especially in a laminated state.

[0002]

2. Description of the Related Art Conventionally, a sheet material is cut using an automatic cutting machine 1 as shown in FIG. Sheet materials such as cloth are spread on the brush table 2 from the material loading side in a laminated state. The brush table 2 has a surface formed by a large number of bristles, and holds the sheet material by vacuum suction from below. The cutting head 3 is provided with a knife-shaped cutting blade that reciprocates up and down. The bristles forming the surface of the brush table 2 escape from the cutting edge at the portion where the cutting edge of the cutting blade penetrates.

The cutting head 3 can reciprocate on the Y beam 4. The Y beam 4 can reciprocate along the longitudinal direction of the brush table 2 perpendicularly to the longitudinal direction of the Y beam 4. The longitudinal directions of the brush table 2 and the Y beam 4 are the X axis direction and the Y axis direction, respectively. The cutting head 3 is movable in the X-axis direction and the Y-axis direction. The cutting blade provided on the cutting head 3 is
It is a strip-shaped knife whose axial direction extends in the Z-axis direction perpendicular to the surface of the brush table 2. The cutting blade is formed on the front edge parallel to the axis. A drive source for reciprocating the cutting blade in the Z-axis direction is provided in the cutting head 3. Further, a cutting blade elevating mechanism for moving the cutting head 3 without pulling the cutting blade upward to perform cutting is also provided. A mechanism for angularly displacing the cutting blade in the R-axis direction to change the cutting direction of the cutting blade is also provided.

An operating section 5 is provided at one end of the Y beam 4. The control of the automatic cutting machine 1 is performed by operating the operation unit 5 or cutting data on a floppy disk to be inserted into the floppy disk device 6.

The sheet material is carried in and out while the brush table 2 is carried in the X-axis direction. Brush table 2
Is configured as an endless belt conveyor, and a sheet material is placed on a horizontal portion of the upper surface of the conveyor to perform vacuum suction or conveyance. A carry-in side air table 7a is provided on the upstream side of the brush table 2, which is the cloth carry-in side, and a downstream side is provided with a carry-out side air table 7b. When carrying the sheet material, the brush table 2 is used.
Then, the vacuum suction is stopped and the brush table 2 is operated as a conveyor. When air is ejected from the carry-in side air table 7a, the sheet material can be spread on the brush table 2 while floating on a cushion of air. After the sheet material is cut, the brush table 2 is conveyed while the downstream air table 7 is carried out.
Air is blown out from and the cut parts are taken out.
Since the sheet material is surely vacuum-sucked onto the brush table 2, at the same time when the sheet material is spread on the brush table 2,
The cut vinyl sheet 8a is spread on the surface of the sheet material. The sheet material is cut together with the cut vinyl sheet 8a. Usually, the cutting is performed from the material carrying-out side of the brush table 2, and after the cutting is finished, the closed vinyl sheet 8b is covered to prevent vacuum leakage from the cutting line.

FIG. 7 shows a conventional method for cutting the vicinity of corner points of a sheet material by using the automatic cutting machine 1 shown in FIG. FIG. 7 (1) shows a state in which the cutting blade 9 is rotated in the R-axis direction at the position of the corner angle 10 to continuously cut from the cutting line 11 in the d1 direction to the cutting line 12 in the d2 direction. In the state shown in, the cutting blade 9 that has cut the cutting line 11 in the d1 direction
The blade edge of reaches the corner angle 10. Next, while the cutting edge of the cutting blade 9 is kept at the position of the corner angle 10, the cutting blade 9 is angularly displaced.
The cutting blade 9 goes through the state shown in to the state in which the cutting edge faces the direction d2. From the state shown in FIG.
The cutting line 12 is cut by advancing in two directions. Figure 7
(2) shows the cutting result by the cutting method shown in FIG. 7 (1). It can be seen that the cutting of the cutting part 14 is performed with the cutting state 13 bulging outward from the corner angle 10.

FIG. 8 shows the prior art disclosed in Japanese Patent Publication No. 51-12120. In this prior art, the slit 17 is cut in the middle of cutting the straight cutting line 15 to the cutting line 16. That is, the cutting blade 9 is advanced from the point A along the cutting line 15, and cutting is performed on the cutting line 15 from the state shown in to the state where the tip reaches the point B. Next, the slit 17 is cut by moving the cutting edge of the cutting blade 9 from the point B to the point C from the state shown in to the state shown in. Next, the cutting blade 9 is returned from the state shown in to the state shown in the same position as, and the cutting line 16 is cut from B to D until the state shown in.

[0008]

In the conventional method for cutting the corner angle 10 as shown in FIG. 7, as shown in the cutting state 13, the cutting part 14 is protruded from the original cutting line 12 to the outside. , Unable to make a clean cut.
The cutting state 13 as described above occurs as a result of cutting the sheet material by the reciprocating blade edge when the cutting blade 9 is angularly displaced in the R-axis direction.

After cutting the cutting line 11 to the corner angle 10, if the cutting blade 9 is once pulled out, the direction is changed, the sheet material is pierced again, and the cutting line 12 is cut, the corner 10 is clean. The cutting state can be obtained. However, if the cutting blade 9 is once pulled out from the sheet material and then pierced again, it takes time to cut the corner portion 10. Even in the method as shown in FIG. 8, when cutting the slit 17, the cutting edge of the cutting blade 9 does not coincide with the direction of the slit 17, so that the cutting cannot be performed cleanly.

An object of the present invention is to provide a sheet material cutting method and apparatus which can cleanly cut around the corner points without removing the cutting blade from the sheet material.

[0011]

According to the present invention, the cutting direction is switched from the first direction to the second direction intersecting the first direction by using a cutting blade that reciprocates substantially perpendicularly to the sheet material. In the sheet material cutting method for cutting near the corner points,
The cutting blade is advanced in the first direction to cut the sheet material until the cutting edge exceeds the corner point, the cutting blade is retracted and angularly displaced in the second direction, and the cutting blade moves the cutting line in the second direction. When the extension is reached, the cutting blade is advanced to perform the cutting in the second direction, which is a sheet material cutting method.

Further, the present invention uses a cutting blade that reciprocates substantially perpendicularly to the sheet material and cuts around a corner point where the cutting direction is switched from the first direction to the second direction intersecting the first direction. In the sheet material cutting method for
Direction, the sheet material is cut until the cutting edge crosses the corner point, the cutting blade is retracted in the first direction until the cutting edge returns to the corner point position, and the cutting blade is further retracted to center the corner point. A sheet material cutting method characterized by performing angular displacement in a second direction, and when the cutting blade reaches an extension of the cutting line in the second direction, advances the cutting blade to perform cutting in the second direction. is there.

Further, according to the present invention, a cutting blade that reciprocates substantially perpendicularly to the sheet material is used to cut the vicinity of the corner point where the cutting direction is switched from the first direction to the second direction intersecting the first direction. In the sheet material cutting method for
In the second direction, the sheet material is cut until the cutting edge exceeds the corner point, the cutting blade is retracted, and angular displacement is performed in the second direction. When the cutting blade reaches the extension of the cutting line in the second direction. ,
A sheet material cutting method is characterized in that a cutting blade is advanced to perform cutting in a second direction.

Further, according to the present invention, the sheet material placed on the cutting table is reciprocated substantially perpendicularly to the sheet material by using the cutting blade, and the second direction intersects with the first direction from the first direction.
In the sheet material cutting device that cuts the vicinity of the corner point where the cutting direction is switched, the setting means for setting the overcut amount and the return amount, and the cutting edge so that the cutting edge exceeds the corner point by the set overcut amount. The cutting blade is moved forward in the first direction, and the cutting blade is retracted and angularly displaced so that the cutting edge retracts from the corner point to the extension of the second direction by the set return amount. It is a sheet material cutting device characterized by including control means for advancing the sheet material.

[0015]

According to the present invention, since the cutting blade is advanced in the first direction and the sheet material is cut until the cutting edge exceeds the corner point, a cut is formed. Next, even if the cutting blade is retracted and angularly displaced in the second direction, the force of the cutting blade to draw the sheet material of the portion to be cut next in the second direction is absorbed by the cut. The cutting blade is moved backward while being angularly displaced, and after reaching the extension in the second direction, the cutting blade is advanced to perform the cutting in the second direction, so it is possible to cut cleanly from the corner point in the second direction. A good cutting state can be obtained. Moreover, since it is not necessary to pull out the cutting blade from the sheet material at the corner points, it is possible to cut quickly.

According to the invention, the cutting blade is advanced in the first direction to cut the sheet material until it exceeds the corner point.
A notch is formed. When the cutting blade is subsequently retracted and the cutting edge returns to the position of the corner point and then angular displacement is performed in the second direction around the corner point, the force that pulls the sheet material in the second direction is absorbed by the cut. To be done. Since the angular displacement of the cutting blade is performed while retreating, the sheet material is not cut by the cutting edge even when the cutting blade is reciprocally moved, and quick and clean cutting can be performed.

Further, according to the present invention, since the cutting blade is advanced in the first direction to cut the sheet material until it exceeds the corner point,
A notch is formed. When the angular displacement in the second direction is performed while retreating the cutting blade, the force of drawing the sheet material by the cut is absorbed, so that the sheet material is not undesirably cut even when the cutting blade is reciprocated. Further, since the cutting blade is not pulled out from the sheet material, it is possible to cut quickly, and moreover, it is possible to cut neatly around the corner points.

Further, according to the present invention, the overcut amount and the return amount are set in the setting means, and the control means performs cutting according to the set overcut amount and return amount. Since the cut is provided by the amount of the overcut, when the cutting blade is retracted, the portion of the sheet material to be cut in the second direction is not drawn. Since the cutting in the second direction is started from the state in which the cutting edge has retracted on the extension in the second direction by the returning amount, the second
The cutting line in the direction can be cut cleanly from the corner point.

[0019]

FIG. 1 shows a cutting method according to an embodiment of the present invention. FIG. 1 (1) shows a control state of the cutting blade 19,
(2) shows the result of cutting. Corner angle 20 which is a corner point
Then, the cutting direction is switched from the cutting line 21 in the d21 direction to the cutting line 22 in the d22 direction. In this embodiment, the cutting blade 1
9 is advanced in the direction d21, which is the first direction, until the cutting edge exceeds the corner angle 20, and a cut is made. Next, the cutting blade 19 is returned until the blade tip reaches the position of the corner angle 20 and brought to the state shown in. Next, while returning the cutting blade 19 to the back, the cutting blade 19 is rotated around the corner angle 20. Cutting blade 19
After reaching the extension line in the direction d22 which is the second direction through the state shown in, the state becomes as shown in. In the state shown in, the cutting edge of the cutting blade 19 returns to the rear from the corner angle 20 with respect to the cutting direction d22. The cutting blade 19 is advanced in the direction of d22 from the state shown in (3) to cut the cutting line 22 from the angle 20.

In the cutting result shown in FIG. 1 (2), the cutting line 2
A cut occurs on the extension of 1 as a cutting state 23. However, the cutting line 22 is cut cleanly from the corner 20. By providing a cut as the cutting state 23,
When the cutting blade is rotated, the force exerted on the sheet material in the rotational direction can be absorbed by the cut portion. Also, by rotating the cutting blade around the corner angle 20 while returning the cutting blade to the back, the direction of the cutting blade can be changed without hitting the cutting edge with the sheet material. Therefore, the angular displacement is performed while the cutting blade reciprocates. Even if it does, the sheet material is not cut during the angular displacement. When cutting is performed by advancing the cutting blade 19 in the direction d22 from the state of FIG. 1 (1), the sheet material does not hit the cutting edge and cutting is not performed until the cutting edge reaches the corner angle 20.
After the cutting edge reaches the corner angle 20, a clean cut is made along the cutting line 22. As a result, the outer shape of the cutting part 24 can be cut cleanly. From the state of the cutting blade, it is also possible to perform the backward movement and the angular displacement at the same time to bring the cutting blade into the direct state.

FIG. 2 shows conditions for properly cutting the outer shape of the cutting part 24. The overcut amount V, which is the length of the cut, is necessary to absorb the force pulling the sheet material when the cutting blade rotates. The first return amount R1 is set to retract the cutting edge so as not to perform cutting when the cutting blade 19 is angularly displaced while reciprocating. The second return amount R2 is necessary for advancing the cutting blade 19 after the cutting blade 19 reaches the extension of the cutting line 22 to reliably cut the cutting line 22 from the corner angle 20. According to an experiment by the present inventor, the overcut amount V is 1 mm,
The condition of 2 mm is set as the first and second return amounts R1 and R2, and a good cutting state is obtained. That is, the overcut amount V and the return amounts R1 and R2 are extremely small values, and can be sufficiently accommodated in the gap between the parts in the usual arrangement of the cut parts 24.

FIG. 3 shows a cutting method according to another embodiment of the present invention. In this embodiment, the cutting blade 19 is advanced by the amount of overcut V as shown in, and then the cutting blade 19 is immediately moved backward while the angular displacement is performed.
The state in which the cutting line 22 is retracted by an amount corresponding to the return amount R2 is set as an extension of the cutting line 22. According to the present embodiment, the number of steps for converting the cutting direction is reduced, so that quick cutting can be performed.

FIG. 4 shows a cutting method according to still another embodiment of the present invention. In the present embodiment, the cutting with the overcut amount V is performed in the state of, and the cutting line 21 is retracted so that the cutting edge coincides with the corner angle 20. Further cutting blade 1
9 is moved parallel to the cutting line 22 in the direction opposite to the cutting direction. After that, the cutting blade 19 is angularly displaced, and the cutting line 2
In the state of the position of the extension of 2, the cutting line 22 is cut from the corner angle 20 by advancing. According to the present embodiment, only the forward and backward movements are performed on the cutting line 21, and the angular displacement of the cutting blade 19 can be performed at a position away from the corner angle 20, so that the angular displacement of the cutting blade 19 is reliably performed. be able to. That is, since the cutting blade 19 has an R-axis for angular displacement at a position different from the cutting edge, it is necessary to perform angular displacement around the cutting edge position while displacing the cutting head also along the X-axis and the Y-axis. . According to the present embodiment, since such an angular displacement is performed at a position away from the position of the corner angle 20, even if the return amount R2 after the angular displacement becomes smaller than the parallel movement amount R1 of the cutting blade, the cutting edge is moved. It is possible to reliably maintain the position retracted from the corner angle 20.

FIG. 5 shows the electrical construction of a cutting device for realizing the cutting method of each embodiment shown in FIG. 1, FIG. 3 or FIG. The control of the cutting method in each embodiment is performed by the control circuit 30 including a microcomputer and the like. The pattern input device 31 for inputting the shape and the like of the cut parts 24 is realized by, for example, the floppy disk device 6 shown in FIG. 6 or an interface device for online connection. Usually, the arrangement of the cutting parts 24 is set in advance by a marking process so that a plurality of cutting parts 24 can be cut from a sheet material without waste by one cutting. The set amount input device 32 is realized by, for example, the operation unit 5 shown in FIG. 6, and the overcut amount V, the return amounts R1, R2, etc. are set. Needless to say, it can be included in the cutting data provided from the floppy disk device 6 or the online device.

The control circuit 30 controls the X-axis motor 33, the Y-axis motor 34, the Z-axis air cylinder 35, the R-axis motor 36, and the cutting motor 37 according to the inputted cutting pattern. The X axis motor 33 drives the Y beam 4 in the X axis direction. The Y-axis motor 34 drives the cutting head 3 in the Y-axis direction. The Z-axis air cylinder 35 carries out an elevation drive for lowering the cutting blade to pierce the sheet material and for raising the cutting blade to pull out the sheet material. The R-axis motor 36 performs angular displacement of the cutting blade. The cutting motor 37 causes the cutting blade to reciprocate in the Z-axis direction so that the cutting blade can perform cutting.

In order to cleanly cut the vicinity of the corner without depending on the present embodiment, for example, the Z-axis air cylinder 35 is controlled so that the cutting blade is once pulled out at the corner, and the R-axis motor 36 performs the angular displacement. It is conceivable that the cutting blade is pierced into the sheet material again after the cutting is performed to perform cutting in the next cutting direction. However, it takes time to pull out the cutting blade from the sheet material and pierce it again. Although it is conceivable to stop the reciprocating motion of the cutting blade when changing the cutting direction by controlling the cutting motor 37, it takes time to stop because the cutting motor 37 and the cutting blade have inertia. It also takes time to restart. Generally, rather than controlling the cutting motor 37 to stop the reciprocating motion of the cutting blade,
It is faster in time to control the Z-axis air cylinder 35 to pull out the cutting blade and pierce it again. According to the present embodiment, the cutting direction can be switched while the cutting blade is reciprocatingly moved, so that more rapid cutting can be performed.

Further, although the vicinity of the corners on the outer periphery of the cut part is cut in this embodiment, it is needless to say that slits, notches, etc. used for alignment and the like can also be cut in the same manner.

[0028]

As described above, according to the present invention, the cutting is performed in the first direction until the cutting edge of the cutting blade exceeds the corner point.
When the blade edge is thereafter angularly displaced, the portion of the sheet material to be cut in the second direction is rarely pulled in. Further, since the cutting blade is retracted and angularly displaced, undesired cutting does not occur even when the cutting blade reciprocates. Further, since the cutting blade reaches the extension of the cutting line in the second direction and then advances to perform the cutting in the second direction, the second direction can be cut cleanly from the corner point.

Further, according to the present invention, the cutting edge of the cutting blade is the first
After cutting in the direction and crossing the corner point, the cutting blade is retracted in the first direction until the cutting edge returns to the position of the corner point, and while further retracting the cutting blade, the corner in the second direction around the corner point Since the displacement is performed, it is possible to reduce the amount of drawing the sheet material when the cutting blade is angularly displaced. Since the cutting in the second direction starts from the state where the blade edge is retracted from the corner point, the cutting in the second direction from the position of the corner point can be performed neatly.

Further, according to the present invention, since the cutting blade is advanced in the first direction so that the cutting edge goes beyond the corner point and then retracted, the angular displacement is performed in the second direction, so that the cutting direction can be quickly switched. You can Since the cutting is performed extending from the corner point in the first direction, it is less likely that the portion of the sheet material to be cut in the second direction is pulled in at the time of angular displacement. The sheet material is not cut during the angular displacement because the angular displacement is performed while further retracting. Since the cutting is started in the second direction from the extension of the cutting line in the second direction, the cutting in the second direction after the corner point can be performed neatly. Since it is not necessary to pull out the cutting blade from the sheet material when switching the cutting direction, it is possible to perform quick cutting.

Further, according to the present invention, since the cutting is performed in the first direction so that the cutting edge exceeds the corner point by the set overcut amount, the cutting should be performed when the cutting blade is retracted and angularly displaced. The amount of drawing the sheet material in the second direction is reduced. Even if the cutting blade is reciprocated while retreating, the sheet material is not cut during the retreat. In the state where the cutting blade reaches the extension in the second direction, the cutting edge of the cutting blade is retracted from the corner point according to the amount of return, so when the cutting blade is advanced in the second direction, Make sure to start the cutting in the second direction from the position,
You can get a clean cut. Since the cutting in the vicinity of the corner point can be performed without removing the cutting blade from the sheet material, the vicinity of the corner point can be quickly cut.

[Brief description of drawings]

FIG. 1 is a diagram showing a cutting method and a cutting result according to an embodiment of the present invention.

FIG. 2 is a diagram showing cutting conditions in the embodiment of FIG.

FIG. 3 is a diagram showing a cutting method according to another embodiment of the present invention.

FIG. 4 is a diagram showing a cutting method according to still another embodiment of the present invention.

5 is a block diagram showing a schematic electrical configuration of an apparatus for realizing the cutting method shown in FIGS. 1, 3 and 4. FIG.

FIG. 6 is a perspective view showing an appearance of an automatic cutting machine.

FIG. 7 is a diagram showing a conventional cutting method and a cutting result thereof.

FIG. 8 is a diagram showing a slit cutting method according to the prior art.

[Explanation of symbols] 19 cutting blade 20 corner angles 21, 22 cutting line 23 cutting state 24 cutting parts 30 control circuit 31 pattern input device 32 set amount input device 33 X-axis motor 34 Y-axis motor 35 Z-axis air cylinder 36 R-axis Motor 37 Cutting motor

Claims (4)

[Claims] 1. A cutting blade, which reciprocates substantially perpendicularly to a sheet material, is used to cut near a corner point at which a cutting direction is switched from a first direction to a second direction intersecting the first direction. In the sheet material cutting method, the cutting blade is advanced in the first direction to cut the sheet material until the cutting edge exceeds the corner point, the cutting blade is retreated and the angular displacement in the second direction is performed, and the cutting blade is moved to the second position. A sheet material cutting method, comprising: advancing a cutting blade to perform cutting in a second direction when an extension of a cutting line in a direction is reached. 2. A cutting blade, which reciprocates substantially perpendicularly to a sheet material, is used to cut near a corner point where a cutting direction is switched from a first direction to a second direction intersecting the first direction. In the sheet material cutting method, the cutting blade is advanced in the first direction to cut the sheet material until the cutting edge exceeds the corner point, and the cutting blade is retracted in the first direction until the cutting edge returns to the corner point position. While further retreating, perform angular displacement in the second direction around the corner point, and when the cutting blade reaches the extension of the cutting line in the second direction, move the cutting blade forward to cut in the second direction. A method for cutting a sheet material, which comprises performing 3. A cutting blade, which reciprocates substantially perpendicularly to a sheet material, is used to cut near a corner point at which the cutting direction is switched from a first direction to a second direction intersecting with the first direction. In the sheet material cutting method, the cutting blade is advanced in the first direction to cut the sheet material until the cutting edge exceeds the corner point, and while the cutting blade is retracted, angular displacement is performed in the second direction, and the cutting blade moves to the second position. A sheet material cutting method, comprising: advancing a cutting blade to perform cutting in a second direction when an extension of a cutting line in a direction is reached. 4. A sheet material placed on a cutting table,
In a sheet material cutting device, which uses a cutting blade that reciprocates substantially perpendicularly to a sheet material, cuts from a first direction to a second direction intersecting the first direction in the vicinity of an angular point at which the cutting direction is switched, Setting means for setting the overcut amount and the return amount, and the cutting blade is advanced in the first direction by the set overcut amount so that the cutting edge exceeds the corner point, and the cutting edge is angled by the set returning amount. A sheet material cutting device, comprising: a control unit that retracts and angularly moves the cutting blade so as to retract from the point in an extension of the second direction and advances the cutting blade in the second direction.