Cutting device

Abstract

To provide a cutting device for cutting upper and lower ends of a structure supported at both ends such as a column of a building.SOLUTION: A cutting device has a substantially U-shaped frame 100 constituted in a plan view, which can be arranged so as to sandwich a column to be cut. A movable cutting part 200 is mounted on the frame 100. The frame 100 and the cutting part 200 are connected by rails and bearings corresponding to suspension. In the cutting part 200, a driving mechanism 250 for driving an endless band blade 251 is supported by the supporting part 210 so as to be inclined with respect to the frame 100. Each structure of the cutting device is constituted so that it can be operated even when it is turned upside down. By using the cutting device having such a structure, it is possible to cut an upper end of the column by vertically inverting the cutting device after cutting a lower end of the column.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cutting device for cutting a structure supported at both ends. [Background technology]

[0002] As a method for demolishing a multi-story structure, Patent Document 1 proposes placing jacks around the columns of the lower floors, cutting and removing the columns, and proceeding with demolition starting from the lower floors. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5645548 Summary of the Invention [Problem to be solved by the invention]

[0004] However, Patent Document 1 does not specifically disclose a method for cutting columns. In addition, no device suitable for cutting columns is known. This problem is not limited to columns, but is common when cutting structures that are supported at both ends, such as beams of buildings, struts of diagonal bracing scaffolding, beams, and diagonal braces. In view of the above problems, an object of the present invention is to provide a cutting device for cutting a structure supported at both ends. [Means for solving the problem]

[0005] The present invention relates to 1. A cutting device for cutting a structure supported at both ends, comprising: A platform having a substantially U-shape in a plan view that can be installed so as to sandwich the structure; A suspension rail is installed parallel to both straight extensions of the U-shape of the frame; a cutting unit movably mounted along the rail and having a power-driven cutting blade for cutting the structure; The cutting section can be configured so that the entire cutting device can be rotated 180 degrees to move and cut along the rail, and can be configured as a cutting device attached to the rail by a bearing that supports suspension.

[0006] The structural body in the present invention includes a support, beam, and brace of a building or scaffold. According to the present invention, when the frame is installed so that the straight extension part sandwiches the structural body to be cut, the cutting part moves on the rail, so that one end of the structural body can be cut. In addition, the cutting device can be turned 180 degrees and operated to cut the other end. For example, when cutting a pillar of a building, the upper and lower ends of the pillar are cut in a state where the cutting part moves on the frame, and in a state where the cutting part is turned upside down and suspended from the frame. When cutting a beam, the left and right ends of the beam are cut in a state where the cutting part moves to the right side of the frame, and in a state where the cutting part is turned 180 degrees to the left side of the frame. In the case of a structural body supported at an angle such as a brace, it is sufficient to turn the frame 180 degrees at an angle corresponding to the angle. A cutting device for cutting a pillar of a building generally requires a large power and is therefore large in size. Therefore, for example, after cutting one end of a pillar of a building, even if the height of the cutting device is adjusted, the cutting device itself gets in the way and it is often impossible to cut the other end. In contrast, the present invention can be operated upside down, so that both the top and bottom ends of the pillar can be cut without any problems. The same applies to other structures.

[0007] In the cutting device of the present invention, The cutting blade is an endless band blade, The cutting section may be configured such that a conveying path of the cutting blade has a predetermined inclination with respect to a surface on which the rail of the stand is installed.

[0008] In the case of an endless belt blade, when it is being transported by a pulley, the blade faces in the same direction as the rotation axis of the pulley, so when cutting the structure, it is necessary to twist the endless belt blade so that it comes into contact with the structure. If the angle of this twist is large, excessive load will be applied to the endless belt blade. In contrast, in the present invention, the conveying path is configured at an incline relative to the surface on which the rail is installed, so that the angle of twist in the cutting portion can be suppressed and the load on the endless band blade can be reduced. The angle of inclination can be determined arbitrarily taking into consideration the load on the endless band blade, but is preferably set to, for example, 30 degrees or more.

[0009] In the cutting device of the present invention, The cutting blade is attached so that a portion of the cutting blade that contacts the structure is linear, The cutting portion may be arranged such that a linear portion of the cutting blade intersects the rail obliquely rather than perpendicularly.

[0010] Pillars and other structures of buildings are not limited to cylindrical shapes, and many are prismatic. If the part of the cutting blade that comes into contact with the structure is linear, the cutting blade may come into contact with the entire width of the outer periphery of the prismatic structure, which may result in a large load being applied to the cutting blade. According to an aspect of the present invention, the cutting blade is disposed so as to cross the rail at an angle, so that even if the structure is a rectangular columnar structure, the cutting blade hits the outer peripheral surface of the structure at an angle, and it is possible to avoid excessive load being applied to the cutting blade. The above embodiment may be realized by configuring the cutting unit itself so that the cutting blade satisfies the above conditions. Also, the cutting unit may be placed at a yaw angle with respect to the rail. Also, the cutting blade is not necessarily limited to an endless belt blade, and may be, for example, a linear blade that reciprocates.

[0011] In the cutting device of the present invention, The cutting blade is an endless band blade, Another pulley may be disposed on the outer periphery of a drive pulley that drives the cutting blade, and determines a transport path of the cutting blade so that the cutting blade comes into contact with the outer periphery of the drive pulley over an angle of 90 degrees or more.

[0012] According to the above-described embodiment, the cutting blade is in contact with the drive pulley over an angle of 90 degrees or more, which has the advantage that the driving force can be efficiently transmitted to the cutting blade. The configuration for realizing the above aspect can be realized, for example, by the arrangement of pulleys located before and after the drive pulley in the conveying path.

[0013] In the cutting device of the present invention, The cutting blade is an endless band blade, Some or all of the pulleys that determine the transport path of the cutting blade may have a mechanism for adjusting the height and inclination thereof.

[0014] The conveying path of the endless strip blade needs to be arranged in a plane. If the height or inclination of the pulley is uneven, the conveying path will not be arranged in a plane and the endless strip blade may fall off the pulley. According to the above aspect, since some or all of the pulleys are provided with mechanisms for adjusting the height and inclination, the conveying path can be configured within a plane, and falling off of the endless belt blade can be prevented.

[0015] In the cutting device of the present invention, The cutting portion is a mounting hole for fastening the bearing, the mounting hole having a play so that a mounting position can be adjusted in a direction intersecting the rail; The bearing may be provided with a fixing mechanism that presses the bearing from both sides in the intersecting direction to fix the position in the intersecting direction.

[0016] In order to move the cutting section smoothly on the rail, it is necessary to adjust the position of the bearing. On the other hand, when the cutting device is turned over, such as when it is turned 180 degrees, the bearing is subjected to a load in the lateral direction, that is, in the direction crossing the rail. For this reason, the bearing needs to be firmly fixed. According to the above aspect, the mounting position can be adjusted, and the position in the direction intersecting the rail can be fixed by the fixing mechanism, so that the above two requirements can be met at the same time.

[0017] In the cutting device of the present invention, Some or all of the parts fastened with bolts are The opening of the hole through which the fastening bolt passes is tapered and chamfered. The bolt may be fastened via a washer having a tapered protrusion corresponding to the chamfer.

[0018] In order to turn the cutting device upside down, it is necessary to firmly fasten each component of the cutting device. However, since there is a slight misalignment or play in the position of the holes, it is not always possible to firmly fasten the components. According to the above aspect, the bolt can be fixed by fitting the tapered convex portion of the washer against the tapered surface, so that the components can be firmly fastened without being affected by misalignment of the hole position or play.

[0019] The present invention does not necessarily have to have all of the above-mentioned features, and may be configured by omitting or combining some of them as appropriate. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is an explanatory diagram showing the overall structure of the cutting device. [Diagram 2] FIG. 2 is an explanatory diagram showing an overview of cutting by a cutting device. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 4 is an explanatory diagram showing a configuration of a cutting unit. [Figure 7] FIG. 4 is an explanatory diagram showing a drive mechanism of a cutting unit. [Figure 8] FIG. 4 is an explanatory diagram showing a pulley adjustment mechanism. [Figure 9] FIG. 4 is an explanatory diagram showing a configuration of a mounting portion of a bearing. [Figure 10] FIG. 4 is an explanatory diagram showing the structure of a washer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described based on an example of an apparatus for cutting columns of a building. Fig. 1 is an explanatory diagram showing the overall structure of the cutting device. The photograph shows the cutting device 10 taken obliquely from behind, with reference numbers and other symbols indicating the main parts. The cutting device 10 is a device in which a cutting part 200 moves on a stand 100 in the direction of the arrow in the figure, and cuts a pillar with an endless band blade 251.

[0022] Fig. 2 is an explanatory diagram showing an overview of cutting by the cutting device, in which Fig. 2(a) shows the state in which the upper end of the pillar is cut, and Fig. 2(b) shows the state in which the lower end of the pillar is cut. The cutting device 10 of the embodiment includes a stand 100 and a cutting unit 200 that moves on the stand 100. In the cutting unit 200, a drive mechanism 250 that drives an endless strip blade 251 is supported by a support 210 in an inclined state with respect to the stand 100.

[0023] The stand 100 of the cutting device 10 is substantially U-shaped in plan view. As shown in Fig. 2(a), the stand 100 is fixed to a fork and positioned so that the U-shaped portion sandwiches the pillar to be cut. In this state, the cutting part 200 is moved as shown by the arrow while driving the endless strip blade 251, whereby the upper part of the pillar can be cut off as shown by the dashed line.

[0024] Next, as shown in Fig. 2(b), the forks are inverted to support the cutting device 10 upside down. The column is then sandwiched between the U-shaped portion of the stand 100. In this state, the cutting unit 200 is moved as shown by the arrow while driving the endless belt blade 251, thereby cutting the lower portion of the column as shown by the dashed line.

[0025] The pillar may be cut from either the top or bottom. After cutting one end, it is preferable to fix the pillar in place by driving a wedge into the cut portion before cutting the other end. FIG. 2 shows an example in which the cutting device 10 is supported using a forklift. However, the cutting device 10 may be supported not only by a forklift but also by a backhoe or other heavy machinery, or may be supported by a dedicated cart, support stand, or the like for the cutting device 10. In this way, the cutting device 10 of this embodiment is configured to be able to operate even when upside down, which has the advantage that the cutting device 10 does not get in the way and makes it possible to cut both the upper and lower ends of the pillar. The structure of the cutting device 10 will now be described.

[0026] 3 is a side view of the cutting device. In the stand 100, a rail 120 is installed over almost the entire length on the top surface of an iron body 110. The dimensions can be designed arbitrarily, but in this embodiment, the total length (length in the left-right direction in the figure) is about 4 m. The main body 110 is cut into a rectangular shape as shown in the figure in order to reduce weight. The rails 120 are for the cutting unit 200 to move on. As the cutting device of this embodiment is also used in an upside-down state as described in Fig. 2, the rails 120 are designed to be suspended so that the cutting unit 200 can be moved.

[0027] The cutting unit 200 has a structure in which the driving mechanisms 250R, 250L are supported at an incline by the supporting parts 210R, 210L. The reason there are two supporting parts and two driving mechanisms is that the base 100 is U-shaped in a plan view and the main body 110 has two straight extending parts. The inclination angle a1 of the drive mechanisms 250R and 250L can be determined arbitrarily. In this embodiment, it is set to 30 degrees. The reason for providing such an inclination will be described later.

[0028] A plurality of bearings 220 that engage with the rail 120 are attached to the underside of the cutting unit 200. The action of the bearings 220 allows the cutting unit 200 to move forward and backward on the rail 120 in the direction of arrow F and the opposite direction.

[0029] 4 is a plan view of the cutting device. The stand 100 is formed into a substantially U-shape in plan view (inverted U-shape in the example shown) by the main bodies 110R and 110L extending vertically on the left and right sides and the main body 110C connecting the two. In the figure, the main body 110C is hatched to make it easy to distinguish it from the cutting unit 200. The main body 110C is partially cut out into a rectangular strip to reduce weight. The dimensions of the main bodies 110R, 110L, and 110C can be designed arbitrarily according to the size of the pillar to be cut (shown by cross-hatching in the drawing). As shown in the drawing, it is preferable to set the dimensions so that the pillar can be clamped with some slack. If the gap between the main bodies 110R and 110L is narrow, the pillar cannot be clamped. Also, if the gap between the main bodies 110R and 110L is too wide, the endless band blade 251 stretched between them may sag, making it difficult to cut well. Rails 120R and 120L are installed in parallel on the left and right main bodies 110R and 110L. The cutting unit 200 can move on the rails 120R and 120L.

[0030] The driving mechanism 250 of the cutting unit 200 is substantially U-shaped in plan view (inverted U-shaped in the illustrated example) with driving mechanisms 250R and 250L extending straight to the left and right and a driving mechanism 250C connecting the two. The driving mechanisms 250R and 250L move on rails 120R and 120L, respectively. A pulley is provided in the drive mechanism as shown by the dashed line in the figure, and conveys an endless belt blade 251. The endless belt blade 251 is exposed in a state of being stretched in a straight line by the pulley between the drive mechanisms 250R and 250L, and can cut a pole.

[0031] In the embodiment, the drive mechanism 250 is installed with a yaw angle a2 relative to the rails 120R, 120L. As a result, when the main bodies 110R, 110L are arranged parallel to the side surface of a pillar, the endless blade 251 comes into contact with the surface of the pillar at an angle, and it is possible to prevent excessive load from being applied to the endless blade 251 during cutting. The magnitude of the yaw angle a2 can be arbitrarily designed in consideration of the load applied to the endless belt blade 251.

[0032] Fig. 5 is a front view of the cutting device. As explained in Fig. 3 and Fig. 3, the stand is composed of main bodies 110R, 110L, and 110C, and rails 120R and 120L are installed on the main bodies 110R and 110L. In addition, insertion parts 111R and 111L for inserting and fixing the forks of a forklift are provided on the lower side of the main bodies 110R and 110L.

[0033] In the cutting section, driving mechanisms 250R, 250L, and 250C are supported by supports 210R and 210L. An endless belt blade 251 is exposed at the tip of the driving mechanisms 250R and 250L in a state where it is stretched linearly by tension.

[0034] Fig. 6 is an explanatory diagram showing the configuration of the cutting section, with Fig. 6(a) showing a front view and Fig. 6(b) showing a side view. The endless belt blade 251 is conveyed along a conveying path formed by a drive pulley 260, a pulley 262, a tension pulley 264, and a pulley 266, which are attached inside the driving mechanisms 250R, 250L, and 250C of the cutting section. A motor 270 is attached to the drive pulley 260 as shown in Fig. 6(b). The endless belt blade 251 can be driven by rotating the drive pulley 260 with the power of the motor 270. The position of the tension pulleys 264 can be adjusted to provide sufficient tension to the endless strip blades 251 to prevent them from falling off the pulleys.

[0035] The endless blade 251 is conveyed along the outer circumferential surface of the pulley with the blade facing downward, but the part exposed to the outside between the drive mechanisms 250R and 250L is twisted by the guide 268 to face horizontally. In this way, the blade faces forward and can cut the pillar. If the drive mechanism is installed horizontally, the guide 268 will need to twist the blade 90 degrees from vertically downward to horizontal, which will apply a large load to the endless blade 251. In contrast, in this embodiment, the drive mechanism is installed at an inclination of 30 degrees, so that a twist of 60 degrees is sufficient to make the endless blade 251 horizontal. By installing the drive mechanism at an inclination in this manner, the twist angle of the endless blade 251 can be kept small, and the load on the endless blade 251 can be reduced. The inclination angle of the drive mechanism is not limited to 30 degrees, but can be set to various values.

[0036] Fig. 7 is an explanatory diagram showing the drive mechanism of the cutting unit, as viewed in the direction of arrow V in Fig. 6(b). As explained in FIG. 6, the drive mechanism is equipped with a drive pulley 260, a pulley 262, a tension pulley 264, and a pulley 266. The endless band blade 251 is transported in the directions of the arrows d1 to d4. The position of the tension pulley 264 can be adjusted in the direction of the arrow T. This has the following effects. First, it is possible to apply an appropriate tension to the endless band blade 251 so that it does not fall off the pulley or slip on the drive pulley 260. In addition, since the endless band blade 251 is not necessarily constant, it is possible to adjust the tension according to the variation in its length. In addition, by suppressing the deflection of the part of the endless band blade 251 that comes into contact with the pillar, it is possible to improve the cutting accuracy. The tension pulley 264 may be fixed after the tension has been adjusted in advance, or the tension pulley 264 may be pre-pressurized or biased so that an appropriate tension is applied during operation.

[0037] The angle a3 formed by the conveying directions d1, d2 from the pulley 266 through the drive pulley 260 to the pulley 262 is an acute angle. In other words, these pulleys are arranged so that the angle a3 formed by the line segment connecting the centers of the pulley 266 and the drive pulley 260 and the line segment connecting the centers of the drive pulley 260 and the pulley 262 is an acute angle. In this way, the endless band blade 251 is conveyed over an angle of 90 degrees or more on the outer circumferential surface of the drive pulley 260, and can efficiently receive the driving force. The angle a3 can be designed arbitrarily while taking into consideration the transmission of the driving force.

[0038] Fig. 8 is an explanatory diagram showing the adjustment mechanism of the pulleys. Since the transport path of the endless band blade 251 is determined by the four pulleys shown in Fig. 7, these pulleys must be located in the same plane and their rotation axes must coincide with the normal line of the plane. If the pulleys are not in the same plane or if their rotation axes are inclined, there is a risk that the endless band blade 251 will fall off the pulleys.

[0039] To achieve this arrangement, the pulley of this embodiment is provided with a mechanism for adjusting the height and inclination. As shown in Fig. 8, the pulley 264 is attached to a rotating shaft 264a via a bearing. The rotating shaft 264a has a male thread and the base 264b has a female thread, and the height of the pulley 264 can be adjusted by the amount of screwing, as shown by the arrow U. The amount of screwing is fixed by a lock nut 264e so that the height of the pulley 264 does not change during operation. The base 264b is fixed by bolts 264d and 264c. The inclination of the pulley 264 can be adjusted by changing the tightening of the bolt 264d, as shown by the arrow R. In Fig. 8, pulley 264 is shown as an example, but the other pulleys can also be provided with similar adjustment mechanisms. However, it is not necessary to provide the adjustment mechanisms to all pulleys, and it is acceptable to provide them to only some of the pulleys. Furthermore, the height and inclination adjustment mechanisms are not limited to the mechanisms shown in Fig. 8, and various configurations can be applied.

[0040] 9 is an explanatory diagram showing the configuration of the bearing attachment portion, illustrating the structure of the bearing 220 attached to the lower surface of the support portion 210 of the cutting portion. As already explained, rail 120 is attached onto main body 110 of the stand. Rail 120 is fixed with bolt 121. Rail 120 and bearing 220 are suitable for suspension, and have a cross-sectional shape that will not fall off even if the rail is turned upside down as shown in the figure. For the sake of convenience, the direction intersecting rail 120 will be referred to as the x-direction and the upward direction as the z-direction.

[0041] Bearing 220 is fixed to the underside of support part 210 by bolt 221. The hole through which bolt 221 passes is provided with some play, which allows the position of bearing 220 in the x direction to be adjusted. In this way, the positions of multiple bearings 220 can be adjusted to allow the cutting part to move smoothly on rail 120.

[0042] If the cutting device is used only with the cutting part placed on the rail 120 as shown in Fig. 9 or only with it turned upside down, there will be no problem if it is simply fixed with the bolts 221. However, in this embodiment, as shown in Figs. 2(a) and (b), in order to cut the upper and lower ends of the pillar, it is necessary to turn the cutting device upside down midway through the process. During this turning process, the cutting device may tip over, so it is necessary to attach the cutting part so that it will not fall off the rail 120 even in this tip over state. Fig. 9 shows the structure for this purpose.

[0043] As shown in the figure, pressing blocks 230 are attached by bolts to both sides of bearing 220. The through holes of bolts 231 also have some play, allowing pressing block 230 to move in the x direction. Furthermore, pressing block 230 has holes for fastening bolts on both outer sides, and holding blocks 215 for holding the bolts are temporarily fixed to the lower surface of support part 210 by bolts 216, and then welded to firmly fix the blocks so as not to move in the x direction. A pressing bolt 217 is attached to the holding block 215, and by tightening the bolt, the pressing block 230 can be pressed against the bearing 220. This structure allows the position of the bearing 220 to be adjusted in the x direction, and after adjustment, the bearing 220 can be firmly fixed so as not to move in the x direction by the pressure bolt 217. Therefore, even if the cutting device is overturned during the upside-down inversion process, it is possible to prevent the bearing 220 from shifting in the x direction or falling off the rail 120. In the structure shown in FIG. 9, the pressing block 230 is provided to ensure that a pressing force is applied to both ends of the bearing 220. If the pressing bolt 217 can be attached in a position that ensures that it presses both ends of the bearing 220, the pressing block 230 may be omitted.

[0044] The cutting device of the embodiment is used upside down, so loads may be applied to each part from various directions, including during the inversion process. Therefore, it is desirable that each part be firmly fastened so that such loads do not cause the fastening state of each part to shift. Therefore, the cutting device of the embodiment uses a fastening mechanism using a washer as shown below.

[0045] Fig. 10 is an explanatory diagram showing the structure of a washer. It shows the state in which member 1 and member 2 are fastened with a bolt. In this embodiment, a tapered surface is formed at the opening of the screw hole drilled in member 1 as shown in the figure. The right side of the figure shows a side view of the washer used for fastening (the dashed lines representing the holes formed inside are omitted.) The washer has an annular portion with a through hole in the center, and a tapered protruding portion with a through hole in the center as well. When fastening, the bolt is tightened with the tapered protrusion facing downwards. In this way, the tapered protrusion fits into the tapered surface of the screw hole, so even if there is misalignment or play in the screw hole, the members 1 and 2 can be firmly fastened together. It should be noted that the structure of FIG. 10 does not necessarily have to be used for all fastening parts, and may be applied to only some of the fastening parts.

[0046] According to the cutting device of the embodiment described above, the cutting device can be operated upside down, so that the upper and lower ends of the pillar can be cut without any trouble using the endless strip blade 251. It is not necessary to provide all of the various features described in the embodiments, and some of them may be omitted or combined as appropriate. In addition, the present invention is not limited to the various structures shown in the embodiments, and various modifications can be made without departing from the spirit of the present invention. In the embodiments, an example of cutting the top and bottom of a pillar of a building is shown, but the present invention can also be configured as a device for cutting various structures supported at both ends, such as beams and braces of buildings and scaffolding. [Industrial Applicability]

[0047] The present invention can be utilized to cut structures that are supported at both ends. [Explanation of symbols]

[0048] 10 Cutting device 100 Mount 110, 110R, 110L, 110C body 111R, 111L insertion section 120, 120R, 120L rails 121 volts 200 cutting section 210, 210R, 210L support part 215 Holding Block 216 Volts 217 Press bolt 220 Bearing 221 Volts 230 Pressing Block 231 Volts 250, 250C, 250R, 250L Drive Mechanism 251 Endless band blade 260 Drive pulley 262 Pulley 262a Rotation axis 262b Pedestal 262c, 262d bolts 264 Tension pulley 266 Pulley 268 Guide 270 Motor

Claims

1. 1. A cutting device for cutting a structure supported at both ends, comprising: A platform having a substantially U-shape in a plan view that can be installed so as to sandwich the structure; A suspension rail is installed parallel to both straight extensions of the U-shape of the frame; a cutting unit movably mounted along the rail and having a power-driven cutting blade for cutting the structure; The cutting section is configured so that the entire cutting device can be turned 180 degrees to move along the rail and perform cutting, and the cutting device is attached to the rail by a bearing that supports suspension.

2. 2. The cutting device of claim 1, The cutting blade is an endless band blade, The cutting device is configured such that the conveying path of the cutting blade of the cutting unit is inclined at a predetermined angle with respect to a surface on which the rail of the frame is installed.

3. 3. The cutting device according to claim 1 or 2, The cutting blade is attached so that a portion of the cutting blade that contacts the structure is linear, A cutting device in which the cutting section is arranged so that a straight portion of the cutting blade intersects the rail obliquely rather than perpendicularly.

4. The cutting device according to any one of claims 1 to 3, The cutting blade is an endless band blade, A cutting device in which another pulley for determining a conveyance path of the cutting blade is disposed on an outer periphery of a drive pulley for driving the cutting blade so that the cutting blade contacts the outer periphery of the drive pulley over an angle of 90 degrees or more.

5. The cutting device according to any one of claims 1 to 4, The cutting blade is an endless band blade, A cutting device in which some or all of the pulleys that determine the transportation path of the cutting blade have a mechanism for adjusting the height and inclination thereof.

6. The cutting device according to any one of claims 1 to 5, The cutting portion is a mounting hole for fastening the bearing, the mounting hole having a play so that a mounting position can be adjusted in a direction intersecting the rail; a cutting device including a fixing mechanism that presses the bearing from both sides in the intersecting direction to fix the position in the intersecting direction.

7. The cutting device according to any one of claims 1 to 6, Some or all of the parts fastened with bolts are The opening of the hole through which the fastening bolt passes is chamfered in a tapered shape. The bolt is fastened via a washer having a tapered protrusion corresponding to the chamfer. Cutting device.

Images