Cutting device for plate-shaped workpieces

Abstract

To cut a plate-like workpiece with high efficiency and without generating any cutting chips by using the increased cutting force of a disk cutter. [Solution] The disc cutter C has a thin, sharp blade portion formed continuously on the outer periphery of a disc. The disc cutter C is attached to one end of a cutter shaft supported by a first arm A1. By rotating the oscillating drive shaft S3, the first arm A1 is caused to perform a reciprocating circular swing motion around an intermediate transmission shaft (rotation fulcrum shaft) S1 via a crank rod R, whereby the entire disc cutter C is caused to perform a reciprocating circular swing motion in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the disc cutter C with respect to the plate-shaped workpiece W, and the continuously rotating disc cutter C cuts the plate-shaped workpiece W.

Description

[Technical field]

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

[0002] In order to continuously cut a wooden or foamed resin plate-shaped workpiece with a disc cutter, as shown in Patent Document 1, a circular saw with a saw blade continuously formed on the outer periphery of a disc is used as the disc cutter, and since the cutting part is cut by cutting with the "saw blade" of the circular saw, a large amount of cutting chips is inevitably generated, and the cutting chips are scattered around by the rotation of the circular saw, so the scattered cutting chips are collected using a vacuum device or the like. Therefore, a lot of equipment and labor are required to process the cutting chips. In addition, since the cutting is performed with a circular saw, minute unevenness occurs on the cut surface, so the cutting surface cannot meet the requirement of high cutting accuracy.

[0003] In addition, the applicant has obtained a patent for a cutting device in which, by using an ingenious planetary gear mechanism to revolve the axis of a rotating disc cutter, the cutting force is increased by a "hatchet action" while no cutting chips are generated, and in the case of plate-shaped workpieces made of foamed resin, it is possible to cut workpieces of large thickness.

[0004] The present invention is an attempt 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] JP 2022-172723 A [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 cutting of a plate-shaped workpiece with high efficiency by using the increased cutting force of a disc cutter, while completely eliminating the generation of cutting chips. [Means for solving the problem]

[0007] The invention of claim 1 to solve the above problem is as follows: A device for continuously cutting 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 blade portion formed continuously on the outer periphery, The disk 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 axis, 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 stopped from rotating, the first arm is caused to perform a reciprocating arc-shaped swing motion around the swing fulcrum axis via the crank rod by rotating the swing drive shaft, thereby cutting the plate-shaped workpiece with the continuously rotating circular cutter while causing the entire circular cutter to perform a reciprocating arc-shaped swing motion in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the circular cutter with respect to the plate-shaped workpiece.

[0008] According to the invention of claim 1, when the second arm is in a 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 the first arm performs a reciprocating arc swing motion around the swing fulcrum shaft as a fulcrum due to continuous rotation of the swing drive shaft. As a result, the disc cutter supported by the cutter shaft supported by the first arm moves linearly relative to the plate-like workpiece while performing the same reciprocating arc swing motion as the first arm, thereby cutting the plate-like workpiece.

[0009] Here, the circular cutter performs a reciprocating circular-arc oscillating motion along a direction perpendicular or approximately perpendicular to the relative movement direction with respect to the plate-shaped workpiece, so that the trajectory of the center of rotation of the circular cutter is a zigzag, curved straight line. When the thickness direction of the plate-shaped workpiece is used as a reference, the circular cutter cuts the plate-shaped workpiece while moving back and forth (reciprocating circular-arc oscillating motion) in the thickness direction of 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 by slightly moving 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 by slightly moving 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 constantly changing slightly due to the disc cutter having a constant circumferential speed, and the positional attitude of the cutting part of the disc cutter relative to the plate-shaped workpiece changes continuously, so that the part of the entire disc cutter that contributes to cutting the plate-shaped workpiece changes continuously slightly.

[0010] As a result, in cutting with conventional circular saws, the movement trajectory of the circular saw is a straight line, 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 changed 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 changed, so that both the cutting speed of the plate-shaped workpiece and the cutting part of the circular cutter are continuously changing, thereby increasing the cutting force of the circular cutter, achieving highly efficient cutting and making it possible to cut plate-shaped workpieces with a large plate thickness.

[0011] In addition, according to the invention of claim 1, the cutting portion of the plate-shaped workpiece is cut by separation without removal using the sharp blade portion on the outer periphery of the disc cutter, so no cutting chips are generated during cutting as with a chopper blade, and the disposal of cutting chips that was unavoidable when cutting with a conventional circular saw is not necessary. In addition, since it can be regarded as the same as cutting with an ordinary blade, the cut surface is completely smooth without any minute irregularities, and therefore can 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 fixedly arranged on a frame and its rod is connected to the second arm, and the first and second arms connected via the crank rod are rotated backward as a whole about the oscillating fulcrum axis by a forward / backward cylinder, so that the entire disc cutter can be retreated 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 the forward / backward cylinder connected to the second arm, the entire disc cutter is 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 the plate-shaped workpiece is placed, which is safe and allows the operation of placing the 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 serves as the swing fulcrum shaft for the arm or for each of the first and second arms, eliminating the need for a dedicated swing fulcrum shaft, thereby 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 making it possible to increase the stroke of the reciprocating arcuate 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.

[0018] The invention of claim 5 is as follows: A device for continuously cutting 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 blade portion formed continuously 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 place of the second arm, a swing drive shaft that causes the arm to perform a reciprocating circular swing motion around a swing fulcrum shaft is fixedly positioned on a 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. However, the effect of the invention of claim 5 is equivalent to that of claim 1. Effect of the Invention

[0020] In this invention, the first arm is caused to oscillate in a reciprocating arc around the oscillating fulcrum axis via the crank rod by the continuous rotation of the oscillating drive shaft, and the entire disc cutter attached to the first arm is caused to oscillate in a reciprocating arc in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the disc cutter relative to the plate-shaped workpiece, while the continuously rotating disc cutter cuts the plate-shaped workpiece.The speed at which the plate-shaped workpiece is cut by the disc cutter, which has a constant peripheral speed, 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 that 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 cutting chips, highly efficient cutting is achieved, and it becomes possible to cut plate-shaped workpieces with a large thickness. [Brief description 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. [Diagram 2] This is also a side view. [Diagram 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. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] 7(a) and 7(b) are cross-sectional views taken along lines XX and YY in FIG. 6, respectively, and are illustrated with 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]13A and 13B are side views showing the states in which the disc cutter C is maximally and minimally biting into the plate-shaped workpiece W when the cutting device U is moved linearly to cut the fixed plate-shaped workpiece W. [Figure 10] 1A is a diagram showing the path of the axis J2 of the disc cutter C when cutting a plate-shaped workpiece W, and FIG. 1B is a diagram showing the change in the cutting speed of the plate-shaped workpiece W over time. [Figure 11] 13A and 13B are side views showing a state in which the disc cutter C is located at a cutting operation position and a retreated position by the advancement and withdrawal of the rod 81 of the advance / retract cylinder 80. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 table 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 is arranged so as to be able to rise and fall 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 the first and second arms A1 and A2 are rotatably supported by 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 interval, and the base ends of the first arms A1 serve as a rotation fulcrum and are rotatably supported by the intermediate transmission shaft S1. A pair of second arms A2 are arranged on the outer sides of the pair of first arms A1, and the base ends of the second arms A2 serve as a rotation fulcrum and are rotatably supported by 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 integrally 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 the shaft support cylindrical portion 1 and rotatably supported. 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 thin, sharp blade portion C0 formed continuously 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, the cut portion is separated without being removed, resulting in blade cutting that generates no chips.

[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 to which a 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 is fixedly disposed at the middle of a line segment connecting the axes of the intermediate transmission shaft S1 and the swing drive shaft S3 in the pair of second arms A2. 11, when the rod 81 of the forward / backward cylinder 80 is advanced and retreated at a predetermined stroke, the first and second arms A1, A2 are connected to each other via a pair of crank rods R, so that the first and second arms A1, A2 rotate integrally about the axis J1 of the intermediate transmission shaft S1, and the disc cutter C attached to one end of the cutter shaft S2 is disposed either at a position where it can cut the 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 are slightly different in shape in order to cantilever the gear shaft of the seventh tension chain gear G7 on only one of them, but the same reference numerals are used because the functions of the arms are the same.

[0026] As shown in Fig. 7, the base ends of the pair of crank rods R are connected to the oscillating drive shaft S3 with an eccentricity (e), and one crank rod R is connected to one first arm A1 via a connecting boss 2, while the other crank rod R is connected to the other first arm A1 via a connecting boss 3. The connecting bosses 2, 3 have 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 the fourth sprocket gear G4 is attached to the protruding end. First and second sprocket gears G1, 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 the first arm 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 the second arm A2. In FIG. 8, HS1 indicates an insertion hole for a bearing supporting 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 supporting 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 screwed and supported, and HR indicates an insertion hole for connecting bosses 2, 3 for connecting the tip end of the crank rod R to the pair of first arms A1.

[0027] A geared motor M, in which a motor and a reducer are integrated, is installed on the outside of one of the side plate portions 71 of the frame F, and 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 rotation of the motor is decelerated to a low speed by the geared motor M, 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 had a sharp blade formed on the outer periphery of a thin metal disc, and had 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 fully extended 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, so that the disc cutter C attached to one end of the cutter shaft S2 is continuously driven and rotated. In addition, 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 due to 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), the first arm A1 connected to the second arm A2 via the pair of crank rods R performs a reciprocating rotational motion with the axis J1 of the intermediate transmission shaft S1 as the rotation fulcrum, and the disc cutter C arranged at the end of the first arm A1 on the opposite side 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. There are cases where the cutting device U moves linearly with the plate-shaped workpiece W fixed, and cases where the cutting device U is fixedly disposed and the plate-shaped workpiece W moves 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 by two chain gear devices at the intermediate transmission shaft S1, and both the cutter shaft S2 and the swing drive shaft S3 are driven and rotated. With the rotation of the pair of second arms A2 blocked, the pair of first arms A1 perform a reciprocating rotational motion around the axis J1 of the intermediate transmission shaft S1 as a rotation fulcrum. 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 rotation 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 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, when the disc cutter C is most deeply embedded in the plate-shaped workpiece W, the reciprocating circular swing motion of the disc cutter C is such that 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, and 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 because a chain gear device is used as the power transmission means, and in the illustrated example, the axis distance L is secured to be about half the diameter of the disc cutter C. Due to the reciprocating circular-arc swinging motion of the disc cutter C, the axis of the disc cutter C swings in a reciprocating circular-arc swinging motion that is nearly linear in a direction that is nearly perpendicular to the moving 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 circular-arc swinging motion of the disc cutter C is constant, the stroke K, which is the reciprocating movement distance in the direction perpendicular to the moving direction P of the axis of the disc cutter C, can be lengthened.

[0033] The plate-shaped workpiece W is cut by down-cutting with the disc cutter C. The disc cutter C cuts the plate-shaped workpiece W while moving back and forth (reciprocating arc oscillating motion) in the thickness direction of the plate-shaped workpiece W perpendicular to the moving direction P of the cutting device U. For this reason, the trajectory of the axis of the disc cutter C is a zigzag-shaped curved straight line as shown in Fig. 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. That is, when the disc cutter C during continuous rotation transitions from Fig. 9(a) to Fig. 9(b), that is, when the penetration depth of the disc cutter C with respect to the plate-shaped workpiece W transitions from the deepest to the shallowest, the disc cutter C cuts the plate-shaped workpiece W while moving slightly in the same direction as the circumferential movement direction of the blade part of its outer periphery, and when the disc cutter C transitions from Fig. 7(b) to Fig. 7(a), that is, when the penetration depth of the disc cutter C with respect to the plate-shaped workpiece W transitions from the shallowest to the deepest, the disc cutter C cuts the plate-shaped workpiece W while moving slightly in the opposite direction to the circumferential movement direction of the blade part of its outer periphery, alternately repeating these two states 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 work W by the disc cutter C in the present invention (the speed at which the plate-shaped work 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 Fig. 10(b), the cutting speed of the plate-shaped work W is always slightly changed by the disc cutter C with a constant peripheral speed, and the arrangement and posture of the cutting part of the disc cutter C relative to the plate-shaped workpiece changes continuously. Due to the synergy of these two different changes, the part of the entire disc cutter C that contributes to cutting the plate-shaped work W changes continuously and slightly. Therefore, the cutting force of the disc cutter C is increased, high-efficiency cutting is realized, and cutting of a plate-shaped work W with a large plate thickness becomes possible.

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

[0036] A building insulation material made of foamed resin with a plate thickness of 80 mm was set as the plate-shaped workpiece W on the inclined support table N, and the building insulation material was cut using the above-mentioned cutting device U 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 direction, the rod 81 of the advancing and retracting cylinder 80 was retracted to retract the disc cutter C to the retracted position, and in this state, the cutting device U was moved to the upper end of the inclined upward direction, and at the upper end of the inclined upward direction, the rod 81 of the advancing and retracting cylinder 80 was protruded to position the disc cutter C in a cutting position, and the next cut was performed. Disc cutter speed: 140 rpm Disk cutter travel speed: 15m / min Number of reciprocating circular arc oscillations of the disc cutter: 130 reciprocations / min Stroke of reciprocating circular arc oscillation of disc cutter: 20mm

[0037] Other examples of plate-shaped workpieces W that can be cut include cardboard. The rotation speed of the disc cutter C can be up to 150 rpm, and the number of reciprocating circular swing movements 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 any cutting chips, partly because the material was foamed resin. Also, since it was equivalent to cutting with a blade that does not generate any cutting chips, the cut surface was a completely smooth flat surface without any partial steps, and was fully able to withstand the demand for high cutting accuracy.

[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 advance / retract cylinder 80 and second arm A2 are unnecessary. Instead, the oscillating drive shaft S3 is fixedly positioned on the frame F, and the oscillating drive shaft S3 and the arm (the first arm A1) on which the cutter shaft S2 is supported are connected by a crank rod R, and the arm (the first arm A1) is caused to perform a reciprocating circular arc oscillating motion with the intermediate transmission shaft S1 as the oscillating fulcrum axis. [Explanation of symbols]

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

Claims

1. A device for continuously cutting 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 by a cutter shaft that is rotatably supported by a first arm that performs a reciprocating arcuate swing motion around a swing fulcrum axis, 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 a plate-shaped workpiece, characterized in that when the second arm is stopped from rotating, the first arm is caused to perform a reciprocating circular arc swing motion around the swing fulcrum axis via the crank rod by rotating the swing drive shaft, thereby cutting the plate-shaped workpiece with the continuously rotating circular cutter while causing the entire circular cutter to perform a reciprocating circular arc swing motion in a direction perpendicular or approximately perpendicular to the relative linear movement direction of the circular cutter with respect to the plate-shaped workpiece.

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

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 a plate-like workpiece according to claim 3, wherein a power transmission 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 for continuously cutting 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, This device for cutting plate-shaped workpieces is 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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