Cutting device for plate-like workpiece

Abstract

To enable high-efficiency cutting of a plate-like workpiece using an increased cutting force of a disk cutter, while completely eliminating the generation of cutting chips.SOLUTION: A disk cutter C has a thin and sharp blade part continuously formed along an outer peripheral portion of a disk. The disk cutter C is attached to one end of a cutter shaft supported by a first arm A1. By rotating a swing drive shaft S3, the first arm A1 is made to perform a reciprocating arcuate swinging motion about an intermediate transmission shaft (rotational pivot shaft) S1 via a crank rod R. As a result, the entire disk cutter C performs a reciprocating arcuate swinging motion in a direction orthogonal or substantially orthogonal to a relative linear movement direction of the disk cutter C with respect to a plate-like workpiece W, thereby cutting the plate-like workpiece W with the continuously rotating disk cutter C.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a cutting device capable of cutting a plate-shaped workpiece without generating chips by continuously rotating a disc cutter. [Background technology]

[0002] As shown in Patent Document 1, when continuously cutting a wooden or foam resin plate-shaped workpiece with a circular cutter, a circular saw with a continuous saw blade formed on the outer periphery of the circular plate is used as the circular cutter. The saw blade of the circular saw cuts the workpiece by cutting it off, which inevitably generates a large amount of chips. These chips are scattered around the workpiece as the circular saw rotates, so a vacuum device or the like is used to collect the chips. Therefore, a large amount of equipment and labor is required to process the chips. Furthermore, since cutting with a circular saw creates minute irregularities on the cut surface, the method cannot meet the demand for high cutting precision.

[0003] In addition, as shown in Patent Document 2, the applicant has obtained a patent for a cutting device that uses a planetary gear mechanism to revolve the axis of a rotating disc cutter, thereby increasing the cutting force through a "hatchet effect" and generating no cutting chips, and in the case of plate-shaped workpieces made of foamed resin, making it possible to cut workpieces with a large plate thickness.

[0004] The present invention attempts to achieve the same object as the patent invention disclosed in Patent Document 2 by a different means. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-172723 [Patent Document 2] Patent No. 6850509 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to enable plate-shaped workpieces to be cut with high efficiency and without generating any chips by using the increased cutting force of a disc cutter. [Means for solving the problem]

[0007] The invention of claim 1 to solve the above problem is as follows: A device that continuously cuts a plate-shaped workpiece by linearly moving a continuously rotating disk cutter and the plate-shaped workpiece relative to each other, The disc cutter has a thin, sharp blade portion continuously formed on the outer periphery, The disc cutter is rotatably supported on a cutter shaft that is rotatably supported on a first arm that performs a reciprocating arcuate swing motion around a swing fulcrum shaft, A swing drive shaft is supported on the second arm in parallel with the cutter shaft, and a tip end of a crank rod eccentrically connected to the swing drive shaft is connected to the first arm, When the second arm is in a stopped state, the rotation of the swing drive shaft causes the first arm to perform a reciprocating arc swing motion around the swing fulcrum axis via the crank rod, thereby causing the entire disc cutter to perform a reciprocating arc swing motion in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the disc cutter with respect to the plate-shaped workpiece, and cutting the plate-shaped workpiece with the continuously rotating disc cutter.

[0008] According to the invention of claim 1, when the second arm is in a rotationally stopped state, one end of a crank rod is eccentrically connected to a swing drive shaft supported by the second arm, and the other end of the crank rod is connected to the first arm, so that continuous rotation of the swing drive shaft causes the first arm to perform a reciprocating circular swing motion around the swing fulcrum shaft. As a result, the disc cutter supported on the cutter shaft supported on the first arm moves linearly relative to the plate-shaped workpiece while performing the same reciprocating circular swing motion as the first arm, thereby cutting the plate-shaped workpiece.

[0009] Here, the disc cutter performs a reciprocating arc-shaped swinging motion along a direction perpendicular or approximately perpendicular to the direction of relative movement with respect to the plate-shaped workpiece, so the trajectory of the center of rotation of the disc cutter is a zigzag, curved straight line, and when the thickness direction of the plate-shaped workpiece is used as a reference, the disc cutter moves back and forth (reciprocating arc-shaped swinging motion) in the thickness direction of the plate-shaped workpiece, cutting the plate-shaped workpiece. In other words, the disc cutter cuts the plate-shaped workpiece by alternately repeating a "first cutting mode" in which it cuts the plate-shaped workpiece while moving slightly in the same direction as the circumferential movement of the blade part on its outer periphery, and a "second cutting mode" in which it cuts the plate-shaped workpiece while moving slightly in the opposite direction to the circumferential movement of the blade part on its outer periphery.As a result, the cutting speed of the plate-shaped workpiece by the disc cutter is slightly faster in the "first cutting mode" than in the "second cutting mode", even though the circumferential speed of the disc cutter is the same.As a result, the cutting speed of the plate-shaped workpiece is always slightly changing due to the disc cutter's constant circumferential speed, and the positional attitude of the cutting part of the disc cutter relative to the plate-shaped workpiece is continuously changing, so that the part of the entire disc cutter that contributes to cutting the plate-shaped workpiece is continuously changing slightly.

[0010] As a result, in conventional cutting with a circular saw, the movement trajectory of the circular saw is straight, and the plate-shaped workpiece is cut only at specific parts of the circular saw as it rotates continuously, and at a constant cutting speed. In contrast, in the invention of claim 1, as described above, the cutting speed of the plate-shaped workpiece is always slightly changing due to the peripheral speed and the constant circular cutter, and the positioning posture of the cutting part of the circular cutter relative to the plate-shaped workpiece is continuously changing, so both the cutting speed of the plate-shaped workpiece and the cutting part of the circular cutter are continuously changing, and therefore the cutting force of the circular cutter is increased, resulting in highly efficient cutting and making it possible to cut plate-shaped workpieces with large thicknesses.

[0011] Furthermore, according to the invention of claim 1, the sharp blade on the outer periphery of the disc cutter cuts the cut portion of the plate-shaped workpiece by separating it without removing it, so no chips are generated during cutting as with saw blade cutting, and the disposal of chips that was unavoidable when cutting with a conventional circular saw is not necessary. In addition, since it can be considered the same as cutting with a general blade, the cut surface is completely smooth with no minute irregularities, and can therefore meet the demands for high cutting precision for the cut surface.

[0012] The invention of claim 2 is characterized in that, in the invention of claim 1, a forward / backward cylinder is fixed to a frame, and its rod is connected to the second arm, which causes the first and second arms connected via the crank rod to rotate backward together around the swing fulcrum axis, thereby allowing the entire disc cutter to be retracted to a cutting position.

[0013] According to the invention of claim 2, the first and second arms are connected via a crank rod, and when the first and second arms are rotated backward as a unit around the swing fulcrum shaft by an advance / retract cylinder connected to the second arm, the entire disc cutter can be retracted from the cutting position to the retracted position. Therefore, when not cutting (not working), the entire disc cutter is retracted from the cutting position where a plate-shaped workpiece is placed, which is safe and allows the operation of placing a plate-shaped workpiece to be performed easily and safely.

[0014] The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the oscillating fulcrum shaft also serves as an intermediate transmission shaft that is rotated by the transmission of external power, and the power of the intermediate transmission shaft is branched and transmitted to the cutter shaft and the oscillating drive shaft.

[0015] According to the invention of claim 3, the intermediate transmission shaft also serves as the swing fulcrum shaft for the arm or the first and second arms, eliminating the need for a dedicated swing fulcrum shaft, reducing the total number of shafts in the cutting device, and simplifying the transmission structure by branching the power transmission.

[0016] The invention of claim 4 is characterized in that in the invention of claim 3, the power transmission means from the intermediate transmission shaft to the cutter shaft and the swing drive shaft is a chain gear device.

[0017] According to the invention of claim 4, since the power transmission means is a chain gear device, it is possible to increase the axial distance between the intermediate transmission shaft and the cutter shaft, thereby increasing the stroke of the reciprocating arcuate swing motion in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the disc cutter with respect to the plate-shaped workpiece.

[0018] The invention of claim 5 is as follows: A device that continuously cuts a plate-shaped workpiece by linearly moving a continuously rotating disk cutter and the plate-shaped workpiece relative to each other, The disc cutter has a thin, sharp blade portion continuously formed on the outer periphery, the disc cutter is rotatably supported on a cutter shaft which is rotatably supported on an arm which performs a reciprocating arcuate swing motion around a swing fulcrum shaft; a swing drive shaft is fixed to a frame in parallel with the cutter shaft, and a tip end of a crank rod eccentrically connected to the swing drive shaft is connected to the arm; The rotation of the oscillating drive shaft causes the arm to perform a reciprocating arc-oscillating motion around the oscillating fulcrum axis via the crank rod, thereby causing the entire disc cutter to perform a reciprocating arc-oscillating motion in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the disc cutter with respect to the plate-shaped workpiece, thereby cutting the plate-shaped workpiece with the continuously rotating disc cutter.

[0019] The invention of claim 5 differs from the invention of claim 1 in that, in the invention of claim 1, the second arm is omitted and a swing drive shaft that causes the arm to perform a reciprocating circular swing motion around a swing fulcrum shaft is fixedly disposed on the frame, and the swing drive shaft and the arm are connected via a crank rod, causing the arm to perform a reciprocating circular swing motion, but its working effect is equivalent to that of the invention of claim 1. [Effects of the Invention]

[0020] In this invention, the continuous rotation of the oscillating drive shaft causes the first arm to oscillate in a circular arc around the oscillating fulcrum axis via the crank rod, causing the entire disc cutter attached to the first arm to oscillate in a circular arc in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the disc cutter relative to the plate-shaped workpiece, thereby cutting the plate-shaped workpiece with the continuously rotating disc cutter.The disc cutter has a constant peripheral speed, so the speed at which the plate-shaped workpiece is cut is always slightly changing, and the position and orientation of the cutting part of the disc cutter relative to the plate-shaped workpiece are continuously changing, so both the speed at which the plate-shaped workpiece is cut and the cutting part of the disc cutter relative to the plate-shaped workpiece are continuously changing.As a result, the cutting force of the disc cutter is increased without generating chips, highly efficient cutting is achieved, and it becomes possible to cut thick plate-shaped workpieces. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view of a cutting device U for a plate-shaped workpiece W according to the present invention set on an inclined support table N. FIG. [Figure 2] This is also a side view. [Figure 3] 1 is an overall perspective view of a cutting device U for a plate-shaped workpiece W according to the present invention. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] 6A and 6B are cross-sectional views taken along lines XX and YY in FIG. 6, respectively, and show the intermediate transmission shaft S1, the cutter shaft S2, and the swing drive shaft S3 aligned in their axial positions. [Figure 8] 2 is an exploded perspective view showing the positional relationship between a pair of first and second arms A1, A2 and a pair of crank rods R. FIG. [Figure 9]10A and 10B are side views showing the state in which the circular cutter C bites into the plate-shaped workpiece W at its maximum and minimum when the cutting device U moves linearly to cut the fixed plate-shaped workpiece W. [Figure 10] 10(a) is a diagram showing the trajectory of the axis J2 of the disc cutter C when cutting the plate-shaped workpiece W, and FIG. 10(b) is a diagram showing the change in the cutting speed of the plate-shaped workpiece W with respect to time. [Figure 11] 10(a) and 10(b) are side views showing a state in which the disc cutter C is placed at the cutting position and the retreated position by the advancement and retreat of the rod 81 of the advance / retract cylinder 80. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be described in more detail below with reference to the best embodiment. As shown in Figures 1 and 2, a cutting device U for a plate-shaped workpiece W according to the present invention is supported by a pair of guide rails 13 arranged along the inclined surface of an inclined support base N, and an endless chain 12 is connected to each connecting rod 11 provided at the front and rear of a frame F of the cutting device U, so that the cutting device U can be raised and lowered along the inclined surface. In Figures 1 and 2, 82 denotes a geared motor for driving the endless chain 12 to travel in a circular motion.

[0023] 3 to 8, the intermediate transmission shaft S1 is rotatably supported by each side plate portion 71 of the frame F, and the base ends of first and second arms A1 and A2 are rotatably supported on the intermediate transmission shaft S1. The first and second arms A1 and A2 are formed in pairs, and a pair of first arms A1 are arranged on the intermediate transmission shaft S1 at a predetermined distance, with their base ends serving as pivots and rotatably supported on the intermediate transmission shaft S1. A pair of second arms A2 are arranged outside the pair of first arms A1, and their base ends serve as pivots and rotatably supported on the intermediate transmission shaft S1. Therefore, the intermediate transmission shaft S1 also functions as a "rotation fulcrum shaft" when the first and second arms A1 and A2 rotate. The pair of first arms A1 have the same shape, and a shaft support cylindrical portion 1 is provided integrally at their base ends, so that the pair of first arms A1 are connected together via the shaft support cylindrical portion 1. A cutter shaft S2, one end of which in the axial direction is integrally connected to a disc cutter C, is inserted into and rotatably supported by the shaft support cylindrical portion 1. The disc cutter C attached to one end of the cutter shaft S2 is disposed outside one side plate portion 71 of the frame F.

[0024] The disc cutter C is configured with a continuous thin, sharp blade portion C0 formed on the outer periphery of a metal disc. One of the features of the present invention is that cutting of a plate-shaped workpiece W with the disc cutter C is different from conventional "saw blade cutting" in which a circular saw is used to remove the cut portion as chips, and instead separates the workpiece W without removing it, resulting in no chips being generated.

[0025] 6, a swing drive shaft S3 is rotatably supported at the tip of each second arm A2, and the swing drive shaft S3 is connected to the pair of first arms A1 via a pair of crank rods R. A rod connecting fixed shaft S4 is fixedly disposed at the middle of a line segment connecting the respective axes of the intermediate transmission shaft S1 and the swing drive shaft S3 of the pair of second arms A2, to which the tip of a rod 81 of an advancing / retreating cylinder 80 fixed to the back plate portion 72 of the frame F is connected perpendicularly. 11, when the rod 81 of the retractable cylinder 80 is advanced and retracted by a predetermined stroke, the first and second arms A1, A2 are connected to each other via the pair of crank rods R, so that the first and second arms A1, A2 rotate together around the axis J1 of the intermediate transmission shaft S1, and the disc cutter C attached to one end of the cutter shaft S2 is positioned either at a position where it can cut a plate-shaped workpiece W, or at a retracted position where it is completely retracted from the cutting position, as shown in FIG. 9. The pair of second arms A2 have slightly different shapes because only one of them cantilever the gear shaft of the seventh tension chain gear G7, but the same reference numerals are used because they function the same as arms.

[0026] As shown in Figure 7, the base ends of the pair of crank rods R are connected to the oscillating drive shaft S3 with an eccentricity (e), with one crank rod R connected to one first arm A1 via a connecting boss 2, and the other crank rod R connected to the other first arm A1 via a connecting boss 3. The connecting bosses 2, 3 share the same axis J5. That is, the axis J4 of the base ends of the pair of crank rods R is eccentric by (e) with respect to the axis J3 of the oscillating drive shaft S3. The connecting boss 3 protrudes in the axial direction, and a fourth sprocket gear G4 is attached to its protruding end. First and second sprocket gears G1 and G2 are attached closely to one end of the intermediate transmission shaft S1, and a first chain D1 is stretched between the first sprocket gear G1, a third sprocket gear G3 attached to the cutter shaft S2, the fourth sprocket gear G4, and a fifth sprocket gear G5 for tensioning attached to a sprocket gear shaft (not shown) supported at one end by one of the first arms A1. A second chain D2 is stretched between the second sprocket gear G2, a sixth sprocket gear G6 attached to one end of the oscillating drive shaft S3, and a seventh sprocket gear G7 for tensioning attached to a sprocket gear shaft (not shown) supported at one end by one of the second arms A2. In FIG. 8, HS1 indicates an insertion hole for a bearing that supports the intermediate transmission shaft S1 provided on each of the pair of first and second arms A1, A2, HS3 indicates an insertion hole for a bearing that supports the oscillating drive shaft S3 provided on the pair of second arms A2, HS4 indicates an insertion hole into which both ends of the rod connecting fixed shaft S4 are threadably supported, and HR indicates an insertion hole for connecting bosses 2, 3 that connect the tip end of the crank rod R to the pair of first arms A1.

[0027] A geared motor M, which combines a motor and a reducer, is installed on the outside of one side plate portion 71 of the frame F. A third chain D3 is hung between an eighth chain gear G8 attached to one end of the output shaft 4 of the reducer and a ninth chain gear G9 attached to the outside of the second chain gear G2 of the intermediate transmission shaft S1. The geared motor M reduces the rotation of the motor to a low speed, and high-torque power is transmitted to the intermediate transmission shaft S1.

[0028] The material of the disc cutter C was SKH-51, and it was configured with a sharp cutting edge formed on the outer periphery of a thin metal disc, with a diameter of 450 mm and a plate thickness of 1.8 mm.

[0029] Therefore, when the rod 81 of the forward / backward cylinder 80 is protruded to its maximum extent and the disc cutter C is positioned in a cutting position, the power of the geared motor M is transmitted to the intermediate transmission shaft S1, and the power of the intermediate transmission shaft S1 is transmitted to the cutter shaft S2 via a chain gear device consisting of chain gears G1, G3, G4 and a first chain D1, and the disc cutter C attached to one end of the cutter shaft S2 is continuously driven and rotated. The power of the intermediate transmission shaft S1 is transmitted to the oscillating drive shaft S3 via a chain gear device consisting of chain gears G2, G6, G7 and a second chain D2, and the reciprocating linear motion of the tips of a pair of crank rods R connected to the oscillating drive shaft S3 with an eccentricity (e) causes the first arm A1 connected to the second arm A2 via the pair of crank rods R to perform a reciprocating rotational motion with the axis J1 of the intermediate transmission shaft S1 as the rotation fulcrum, and the disc cutter C located at the end of the first arm A1 opposite to the intermediate transmission shaft S1 performs a similar motion.

[0030] The cutting device U of the present invention requires that the cutting device U and the plate-shaped workpiece W to be cut move linearly relative to each other. The cutting device U may move linearly with the plate-shaped workpiece W fixed, or may be fixed and the plate-shaped workpiece W move linearly. For example, when cutting a large plate-shaped workpiece W to a predetermined width, as shown in Figures 1 and 2, the large plate-shaped workpiece W is fixed to an inclined support table N that is slightly inclined relative to the vertical, and the cutting device U is moved linearly along the inclination direction of the inclined support table N by the circular driving travel of the endless chain 12.

[0031] In the cutting device U, when the geared motor M is started, the power of its output shaft 4 is transmitted to the intermediate transmission shaft S1 via the eighth and ninth chain gears G8, G9 and the second chain D2, and the power is branched at the intermediate transmission shaft S1 by two chain gear devices, driving and rotating both the cutter shaft S2 and the swing drive shaft S3. As a result, while the rotation of the pair of second arms A2 is prevented, the pair of first arms A1 perform a reciprocating rotational motion around the axis J1 of the intermediate transmission shaft S1. Due to the reciprocating rotational motion of the pair of first arms A1, the rotating disc cutter C at one end of the cutter shaft S2 supported by the pair of arms A1 performs a reciprocating circular-arc swinging motion around the axis J1 of the intermediate transmission shaft S1 as a rotational fulcrum.

[0032] In the above state, when the cutting device U is moved linearly in the moving direction P from the obliquely upward to the obliquely downward direction of the inclined support table N, as shown in Figures 9 and 10, the disc cutter C moves linearly in the moving direction P while performing a reciprocating circular swing motion with the axis J1 of the intermediate transmission shaft S1 as the pivot point. Here, as shown in Figure 9, the reciprocating circular swing motion of the disc cutter C is such that, when the disc cutter C is most deeply embedded in the plate-shaped workpiece W, the line segment connecting the axis J1 of the intermediate transmission shaft S1, which is the pivot point, and the axis J2 of the disc cutter C becomes parallel to the moving direction P of the cutting device U. Furthermore, because a chain gear device is used as the power transmission means, the distance L between the axes J1 and J2 can be secured to be large (long) relative to the diameter of the disc cutter C. In the illustrated example, the distance L between the axes is secured to be about half the diameter of the disc cutter C. Due to the reciprocating arcuate swinging motion of the disc cutter C, the axis of the disc cutter C moves in a nearly straight line in a direction that is nearly perpendicular to the movement direction P of the cutting device U. Here, since the distance L between the axis centers can be lengthened, when the rotation angle of the reciprocating arcuate swinging motion of the disc cutter C is constant, the stroke K, which is the distance of reciprocating movement of the axis of the disc cutter C in a direction that is perpendicular to the movement direction P, can be lengthened.

[0033] The plate-shaped workpiece W is cut by down-cutting with a circular cutter C. The circular cutter C cuts the plate-shaped workpiece W while moving back and forth (reciprocating arc-shaped swinging motion) in the thickness direction of the plate-shaped workpiece W, which is perpendicular to the moving direction P of the cutting device U. For this reason, the trajectory of the axis of the circular cutter C is a zigzag, curved straight line, as shown in Figure 10(a), which is significantly different from conventional cutting methods in which the trajectory of the axis of a circular saw is a straight line. 9(a) to 9(b), i.e., when the disc cutter C is moving from the deepest to the shallowest penetration depth into the plate-shaped workpiece W, the disc cutter C moves slightly in the same direction as the circumferential movement of its outer blade portion to cut the plate-shaped workpiece W in a "first cutting mode." When the disc cutter C is moving from 9(b) to 9(a), i.e., when the disc cutter C is moving from the shallowest to the deepest penetration depth into the plate-shaped workpiece W, the disc cutter C moves slightly in the opposite direction to the circumferential movement of its outer blade portion to cut the plate-shaped workpiece W, alternating between these two modes to cut the plate-shaped workpiece W. In FIG. 10(a), the dashed line indicates the linear trajectory of the center of the disc cutter of the conventional cutting device, and in FIG. 10(b), the dashed line indicates the constant cutting speed of the plate-shaped workpiece W of the conventional cutting device.

[0034] As a result, the cutting speed V of the plate-shaped workpiece W by the disc cutter C in this invention (the speed at which the plate-shaped workpiece W is cut by the disc cutter C) is slightly faster in the "first cutting mode" than in the "second cutting mode" even though the peripheral speed of the disc cutter C is the same. As shown in Figure 10(b), the cutting speed of the plate-shaped workpiece W is always slightly changed by the disc cutter C with a constant peripheral speed, and the position of the cutting part of the disc cutter C relative to the plate-shaped workpiece changes continuously. The synergistic effect of these two different changes causes the part of the entire disc cutter C that contributes to cutting the plate-shaped workpiece W to change continuously and slightly. Therefore, the cutting force of the disc cutter C is increased, high-efficiency cutting is achieved, and it becomes possible to cut thick plate-shaped workpieces W.

[0035] 11(a), to change the position of the disc cutter C from the protruding rod 81 of the advancing / retracting cylinder 80 to the retracted position, the rod 81 of the advancing / retracting cylinder 80 is retracted as shown in FIG. 11(b), thereby retracting the entire disc cutter C from the cutting position. This ensures the safety of the operator when replacing and setting the plate-shaped workpiece W.

[0036] An 80 mm thick piece of foamed resin building insulation material was set as the plate-shaped workpiece W on the inclined support table N, and the above-described cutting device U was used to cut the building insulation material under the following conditions: That is, the cutting device U was moved obliquely downward from the upper end of the plate-shaped workpiece W supported by the inclined support table N, and at the lower end of the inclined downward movement, the rod 81 of the advancing / retracting cylinder 80 was retracted to retract the disc cutter C to its retracted position, and in this state, the cutting device U was moved to the upper end of the inclined upward movement, and at the upper end of the inclined upward movement, the rod 81 of the advancing / retracting cylinder 80 was extended to position the disc cutter C in a cutting position, and the next cut was made. Disc cutter rotation speed: 140 rpm Disk cutter travel speed: 15m / min Number of circular arc oscillations of the disc cutter: 130 times / min Stroke of circular arc oscillation of disc cutter: 20mm

[0037] Other plate-shaped workpieces W that can be cut include cardboard, etc. The rotation speed of the disc cutter C can be up to 150 rpm, and the number of reciprocating circular oscillations of the disc cutter can be up to 150 reciprocations per minute.

[0038] Although the plate-shaped workpiece W was 90 mm thick, it was cut smoothly without generating chips, partly because the material was foamed resin. Also, since it was equivalent to cutting with a blade that does not generate chips, the cut surface was a completely smooth plane with no unevenness, and was fully able to withstand the demands of high cutting precision.

[0039] Here, when the cutting device U is fixedly positioned and the plate-shaped workpiece W to be cut is moved and cut, the disc cutter C is always positioned in a cutting position, and when it is not retracted, the advancing / retreating cylinder 80 and second arm A2 are unnecessary, and the swing drive shaft S3 is fixedly positioned on the frame F, and the swing drive shaft S3 and the arm (first arm A1) on which the cutter shaft S2 is supported are connected by a crank rod R, and the arm (first arm A1) is caused to swing in a reciprocating arc with the intermediate transmission shaft S1 as the swing fulcrum axis. [Explanation of symbols]

[0040] A1: First arm A2: Second arm C: Disc cutter J1: Center of the intermediate transmission shaft (rotation point axis) J2: Center of the cutter shaft J3: Shaft center of swing drive shaft J4: Axis center of the base end of the crank rod K: Stroke of the circular arc oscillation motion of the disc cutter S1: Intermediate transmission shaft (rotating fulcrum shaft) S2: Cutter shaft S3: Oscillating drive shaft S4: Rod connection fixed shaft U: Cutting device W: Plate-shaped workpiece 80: Retractable cylinder

Claims

1. A device that continuously cuts a plate-shaped workpiece by linearly moving a continuously rotating disk cutter and the plate-shaped workpiece relative to each other, The disk cutter has a thin, sharp cutting edge formed continuously on its outer periphery, the disc cutter is rotatably supported on a cutter shaft that is rotatably supported on a first arm that performs a reciprocating arcuate swing motion around a swing fulcrum shaft; A swing drive shaft is supported on the second arm in parallel with the cutter shaft, and a tip end of a crank rod eccentrically connected to the swing drive shaft is connected to the first arm, A cutting device for plate-shaped workpieces, characterized in that, when the second arm is in a stopped state of rotation, the rotation of the swing drive shaft causes the first arm to perform a reciprocating arc-shaped swing motion around the swing fulcrum axis via the crank rod, thereby causing the entire disc cutter to perform a reciprocating arc-shaped swing motion in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the disc cutter with respect to the plate-shaped workpiece, thereby cutting the plate-shaped workpiece with the continuously rotating disc cutter.

2. The cutting device for plate-shaped workpieces as described in claim 1, characterized in that the entire disc cutter can be retracted to a cutting position by using a forward / backward cylinder fixed to a frame and whose rod is connected to the second arm to rotate the first and second arms connected via the crank rod backward together around the swing fulcrum axis.

3. The cutting device for plate-shaped workpieces as described in claim 1 or 2, characterized in that the oscillating fulcrum shaft also serves as an intermediate transmission shaft that is rotated by the transmission of external power, and the power of the intermediate transmission shaft is branched and transmitted to the cutter shaft and the oscillating drive shaft.

4. 4. The cutting device for plate-shaped workpieces according to claim 3, wherein the means for transmitting power from the intermediate transmission shaft to the cutter shaft and the swing drive shaft is a chain gear device.

5. A device that continuously cuts a plate-shaped workpiece by linearly moving a continuously rotating disk cutter and the plate-shaped workpiece relative to each other, The disk cutter has a thin, sharp cutting edge formed continuously on its outer periphery, the disc cutter is rotatably supported on a cutter shaft which is rotatably supported on an arm which performs a reciprocating arcuate swing motion around a swing fulcrum shaft; a swing drive shaft is fixed to a frame in parallel with the cutter shaft, and a tip end of a crank rod eccentrically connected to the swing drive shaft is connected to the arm; A cutting device for plate-shaped workpieces, characterized in that the arm is caused to perform a reciprocating arc-oscillating motion around the oscillating fulcrum axis via the crank rod by rotating the oscillating drive shaft, thereby causing the entire disc cutter to perform a reciprocating arc-oscillating motion in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the disc cutter with respect to the plate-shaped workpiece, thereby cutting the plate-shaped workpiece with the continuously rotating disc cutter.

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