Cutting machine

Abstract

To provide a cutting machine with a blade cover that is easy to attach and detach, while suppressing rattling caused by the up-and-down movement of the machine during cutting operations, and maintaining good dust collection function in a consistently stable mounting state. [Solution] The cutting machine is equipped with a blade cover mounting mechanism comprising a support plate (10) extending above the rotating shaft (7) of the machine body (3), a long rectangular tubular engaging member (12) placed over the support plate, a frame (26) integrally provided on the back surface of the blade cover through which the engaging member is slidably inserted, and an inverted U-shaped hook (29) that is rotatably hooked onto a locking projection (9) on the machine body side. A slit (25) formed on the back surface of the blade cover allows for vertical movement of the rotating shaft, absorbing vertical movement of the machine body due to uneven road surfaces, while the sliding of the engaging member within the frame suppresses lateral rattle. Furthermore, when the rotating shaft is raised significantly, a projection (11) on the support plate side and an adjacent engaging projection (14) come into contact with the lower end of the frame, pushing up the blade cover and rotating it upward in conjunction with the machine body.

Description

Technical Field

[0001] The present invention relates to a cutting machine provided with a blade cover that covers a blade for cutting, for example, concrete, asphalt, etc. Specifically, it relates to a cutting machine provided with a blade cover mounting mechanism that is easy to attach and detach, and can maintain a stable mounting state during use and continuously exhibit a good dust collection function.

Background Art

[0002] In road and parking lot paving repair, expansion, and removal work as a preliminary preparation for laying new paving, old concrete and asphalt are cut using a cutting machine. This cutting machine is a device that inserts a disk-shaped blade (blade) attached to a rotating shaft downward against the target surface of asphalt or concrete, and cuts while rotating at high speed via the rotating shaft by a prime mover such as an engine.

[0003] Normally, a blade cover that covers the blade is provided, and this cover avoids the scattering of dust around the cutting chips and contact with the blade, ensuring safety. Also, there is a wet cutting machine configured to spray cooling water on the blade during cutting to suppress dust and frictional heat during cutting. In this case, cooling water is supplied into the blade cover through a water supply hose.

[0004] When using a blade with excellent heat resistance, since cooling water is not required, it is sufficient to have a configuration without water supply equipment and equipment for treating drainage sludge. In this case, it is a dry cutting machine, and a separate dust collector is connected to generate a dust collection function inside the cover, and the cutting powder is efficiently collected by the dust collector.

[0005] In this case, some models have a brush installed around the entire circumference of the lower opening of the cover to improve the airtightness inside the cover. This is because when the air inside the cover is powerfully sucked out by a dust collector, creating a negative pressure state lower than the outside air pressure, the brush follows the fine irregularities of the surface to be cut and effectively seals the gaps with the surface, preventing dust from leaking out through the gaps in the cover and allowing it to be collected by the airflow (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2013-129953 [Overview of the project] [Problems that the invention aims to solve]

[0007] Typically, a cutting machine works by attaching the blade to the machine body, then rotating the front end of the machine body upwards along with the blade to lift the blade and move it to the cutting position. Therefore, the blade cover is also fixed to the machine body so that it can rotate vertically together with the blade.

[0008] On the other hand, the blade is attached to the machine before the work begins and removed after the work is completed. Also, the blade may be replaced with a different one depending on the circumstances, such as changes in the object to be cut or problems with the blade itself.

[0009] Furthermore, each time the blade is attached or detached, the blade cover must also be removed and reattached. Therefore, the blade cover attachment mechanism should be simple and not burden the worker or reduce the overall efficiency of the work.

[0010] Therefore, there is a configuration in which a mounting part provided on the aircraft body and a mounting part provided on the blade cover engage with corresponding parts. For example, a plate-shaped support column is erected near the base of the rotating shaft on the aircraft body at an appropriate distance from the aircraft body, and an inverted U-shaped hook is provided on the rear end of the blade cover, and a locking shaft is provided on the aircraft body that rotatably locks this tail section.

[0011] With this mounting mechanism, the blade cover can be easily attached to the machine by simply hooking the hook onto the latching shaft and fitting the machine-side wall of the blade cover between the machine and the inside of the plate-shaped support column. To remove it, simply detach the hook from the latching shaft and lift the entire blade cover upwards.

[0012] In this configuration with the blade cover attached, the blade, fixed to the end of the rotation axis, rotates inside the blade cover. When the front end of the machine is rotated vertically, the blade also moves up and down in conjunction with the blade cover.

[0013] However, as mentioned above, the blade cover mounting mechanism is often a simple structure that does not completely fix the blade cover itself to the machine body with bolts or the like, but rather simply places and locks it in place at a designated location on the machine body. For this reason, if the road surface or other surface to be cut is not flat and has many bumps and dips, and the machine body and blade repeatedly move up and down significantly during cutting, the blade cover may rattle up and down or lift up relative to the machine body.

[0014] In this case, a gap will intermittently form between the lower end opening of the blade cover and the surface to be cut, such as the road surface, making it impossible to maintain negative pressure inside the cover. As a result, the dust collection function will be significantly reduced, which may decrease work efficiency.

[0015] Furthermore, if the mounting is unstable, and there is significant rattle, in the worst case, the blade cover may fall off or break during cutting. Therefore, a blade cover mounting mechanism for cutting machines that can achieve both easy attachment and detachment and stability when mounted is desired.

[0016] In view of the above-mentioned problems, the objective of this invention is to provide a cutting machine equipped with a blade cover mounting mechanism that allows for easy attachment and detachment of the blade cover, while suppressing vertical rattle of the blade cover due to the vertical movement of the rotating shaft to which the machine body and blade are fixed, thereby maintaining a stable mounting state and good dust collection function at all times. [Means for solving the problem]

[0017] To achieve the above objective, the cutting machine according to the invention described in claim 1, for example as shown in Figures 1 to 8, comprises a main body having a drive source, a power transmission unit that transmits rotational force from the drive source to a rotating shaft, and an outer cover that covers them, mounted on a trolley-like body that can move on wheels, a disc-shaped blade that is detachably attached to the rotating shaft, a blade cover that covers the blade and moves integrally with the main body on wheels with its lower end opening facing the surface to be cut, and a blade cover mounting mechanism that allows the blade cover to be detachably attached to the machine and to rotate in accordance with the vertical rotation of the tip of the main body, wherein the blade cover is provided with an outlet to which a suction hose of a dust collector that runs in parallel with the cutting machine and collects dust generated inside the blade cover as the blade cuts the surface to be cut, is connected. The blade cover mounting mechanism comprises a support plate attached to a portion of the machine body located above the rotation axis and extending upward, a rectangular tubular engaging member longer than the support plate and detachably placed over the support plate, a frame portion integrally projecting from the back surface of the blade cover facing the machine body and through which the engaging member is slidably inserted, and an inverted U-shaped hook integrally provided at the rear of the blade cover and rotatably engaged with a locking projection provided on the machine body as the pivot point during the following rotation. The support plate has a support plate side projection that protrudes horizontally below the surface facing the main body, The engaging member has a concave notch at its lower end opening edge that receives the support plate side projection, and an engaging projection that protrudes adjacent to the inverted U-shaped hook side of the notch and is aligned with the support plate side projection. The blade cover has a long slit on its back surface that allows the rotation axis to move up and down, and when the rotation axis reaches the upper end of the slit as the tip of the main body rotates upward, the adjacent support plate side projection and the engaging projection come into contact with the lower edge of the frame, and the frame is positioned such that, as the tip of the main body rotates further upward, the frame pushes the blade cover upward via the frame, with the inverted U-shaped hook as the pivot point.

[0018] According to the cutting machine described in claim 1 of the present invention, in the blade cover mounting mechanism, the blade cover is mounted by simply placing it from above, by placing a rectangular tubular engaging member over the support plate on the machine body side, inserting the engaging member through the frame, and then hooking the inverted U-shaped hook integrally provided on the rear of the blade cover onto a latching projection provided on the machine body, thereby covering the blade with the blade cover. The blade cover can also be removed by simply pulling it upwards in the reverse procedure.

[0019] In this invention, the front end of the cutting machine represents the direction of travel, while the rear end represents the direction opposite to the direction of travel.

[0020] Therefore, the blade cover can be easily attached and detached in a very short time without requiring complicated and time-consuming procedures, significantly reducing the workload during blade replacement and maintenance.

[0021] In addition, for the blade cover in the mounted state, the engaging member that is abutted against the support plate on the machine body side is inserted into the frame portion of the blade cover and relatively slides (guides) with respect to the frame portion, so that it is always held in an appropriate positional relationship in the horizontal direction. Therefore, even during the cutting operation, the blade cover does not sway left and right, and lateral play is suppressed, enabling it to stably protect and cover the blade.

[0022] The blade cover in the present invention is mounted on the main body of the cutting machine so as to be rotatable following the vertical rotation of the tip side of the main body of the cutting machine via a blade cover mounting mechanism. However, in the process of the cutting machine traveling while cutting the cutting target surface with the blade, even if the rotation axis moves up and down together with the machine body due to the unevenness of the cutting target surface, the blade cover mounting mechanism allows this up and down movement, and the blade cover itself does not move up and down and rattle.

[0023] This is because the upward movement of the rotation axis is allowed within a certain range by the slit formed on the back surface of the blade cover. And until the upward movement of this rotation axis becomes large enough for the rotation axis to reach the upper end of the slit, it does not affect the blade cover. That is, within the play range by the slit, the vibration of the rotation axis is not transmitted to the blade cover, and the floating of the cover itself and the play in the vertical direction are suppressed.

[0024] And the upward movement range of the support plate accompanying the upward movement of the rotation axis within the play range by this slit also corresponds to the slidable range within the frame portion of the engaging member. That is, the displacement of the rotation axis accompanying the up and down movement of the machine body is absorbed not only by the clearance by the slit but also by the sliding within the frame portion of the engaging member.

[0025] Therefore, as the engaging member inserted into the frame portion moves together with the support plate and relatively slides within the frame portion, the left - right lateral position of the blade cover with respect to the machine body is regulated while its mounted state is maintained. Thus, even if the machine body moves up and down within a predetermined range, the blade cover is not only free from play in the vertical direction but also from play in the horizontal direction.

[0026] Therefore, even if the machine moves up and down due to unevenness in the road surface that may occur during operation, the blade cover is prevented from detaching from the machine or from rattling unstably up, down, left, or right, and its lower end opening can always maintain a close, grounded state facing the surface to be cut.

[0027] This prevents large gaps from forming between the blade cover and the road surface, stabilizes the negative pressure inside the cover, and as a result, dust generated inside the blade cover during cutting is always efficiently collected by the dust collector through the suction hose from the blade cover's outlet.

[0028] Furthermore, in this invention, the engaging member that is placed over and engages with the support plate receives the support plate side projection in a concave notch formed at its lower end opening edge, and an engaging projection is provided adjacent to the inverted U-shaped hook side of the notch so as to be in line with the support plate side projection, so that when the rotation axis reaches the upper end of the slit, these support plate side projection and engaging projection come into contact with the lower end of the frame portion.

[0029] Therefore, when moving the cutting machine with the blade lifted off the road surface, the front end of the main body is rotated significantly upward. Only when the rotation axis moves further upward beyond the free movement range provided by the slit does the adjacent support plate side projection and engaging projection push up the lower end of the frame, causing the blade cover to rotate upward using the inverted U-shaped hook as a pivot point. However, even in this case, the engaging member remains inserted into the frame, so the blade cover maintains a stable mounting state on the machine body.

[0030] Furthermore, the reason the engaging projection is positioned on the inverted U-shaped hook side, which is the pivot point, is to smoothly and stably transmit the upward force from the support plate side projection and the engaging projection along the rotation trajectory at a position close to the pivot point.

[0031] This prevents unnecessary twisting between the frame and the engaging member, while the support plate side projection and the engaging projection work together to reliably push up the blade cover, which is normally a heavy metal object, and hold it stably in the raised position. This greatly contributes to more firmly suppressing rattling of the blade cover during travel.

[0032] Therefore, for example, when a predetermined cutting process is completed and the cutting machine is to be moved to the next cutting position, the main body can be raised significantly, completely lifting the rotating blade off the road surface, while the blade cover remains securely attached to the machine and is raised along with the road surface, allowing the cutting machine to be moved easily.

[0033] As described above, this invention provides a simple blade cover mounting mechanism while simultaneously achieving ease of attachment and detachment of the blade cover, as well as stable blade cover mounting and maintenance of good dust collection function in a grounded state, by suppressing both vertical and lateral rattle of the blade cover caused by the vertical movement of the machine and blade during cutting operations.

[0034] The cutting machine according to the invention described in claim 2 is characterized in that, for example, as shown in Figures 1 and 2 and Figures 7 and 8, the blade cover is provided with a brush around the entire circumference of the lower end opening.

[0035] According to the cutting machine described in claim 2 of the present invention, the brush extending around the entire circumference of the lower end opening of the blade cover follows the fine irregularities of the surface to be cut, effectively closing the gap with the surface and blocking dust from scattering outwards.

[0036] This improves the airtightness within the blade cover, preventing the negative suction pressure from the dust collector from escaping to the outside, maximizing dust collection efficiency and thus maintaining better dust collection performance.

[0037] In this invention, a dry type is assumed in which dust generated during cutting is sucked up and collected in a dust collector. However, as long as it has the above-described blade cover mounting mechanism configuration and an outlet to which a suction hose communicating with a dust collector can be connected, not only blade covers specifically for dry types but also blade covers for wet types can be used in a dry type configuration. [Effects of the Invention]

[0038] As described above, the blade cover mounting mechanism of this invention allows for easy and quick attachment and detachment of the blade cover to the cutting machine body. Furthermore, even though the blade cover is not completely fixed to the machine body but is rotatably hooked, a long, rectangular tubular engaging member, which is placed over the support plate on the machine body and inserted into the frame on the back of the blade cover, functions as a guide.

[0039] Therefore, vibrations during cutting operations suppress lateral movement and unstable rattling of the blade cover, ensuring a consistently stable mounting state and maintaining a good dust collection function for collecting dust from inside the blade cover.

[0040] Furthermore, by simply raising the front end of the main body significantly so that the upward movement of the rotation axis exceeds the range of motion created by the slit, the projection on the support plate and the engaging projection on the engaging member push up the lower end of the frame and raise the blade cover. As a result, the blade cover can be moved away from the road surface in conjunction with the main body without any additional operation by the operator, dramatically improving the operability when withdrawing or moving the cutting machine with the blade attached. [Brief explanation of the drawing]

[0041] [Figure 1] This is a perspective view showing the overall configuration of a cutting machine according to one embodiment of the present invention, before the blade is attached. [Figure 2] Figure 1 is a front perspective view showing the overall configuration of the blade cover that is attached to the cutting machine. [Figure 3]Figure 1 is a perspective view showing the latching projection provided on the machine body of the cutting machine, as seen from the front of the machine. [Figure 4] Figure 1 is a perspective view showing the mounting state of the support plate, which is a component of the blade cover mounting mechanism of the cutting machine, to the machine body. [Figure 5] Figure 1 is a schematic diagram showing the engaging member, which is a component of the blade cover mounting mechanism of the cutting machine. (a) is a perspective view of the front side, and (b) is a perspective view of the back side. [Figure 6] Figures (a) to (c) are perspective views showing the engagement member shown in Figure 2 being placed over the support plate shown in Figure 3. [Figure 7] Figure 1 is an explanatory diagram showing the interlocking state of the blade cover with respect to the upward movement of the main body and the rotating shaft in the cutting machine, with the blade omitted and the opening / closing window open at each stage. (a) is a perspective view of the main body and rotating shaft before upward movement, (b) is a perspective view of the main body and rotating shaft rotating upward within the free movement range of the slit, and (c) is a perspective view of the main body and rotating shaft rotating upward beyond the free movement range of the slit, with the blade cover also rotating upward. [Figure 8] Figure 6 is an explanatory diagram showing the behavior of the blade cover as viewed from the back side without the main body, where (a) is a perspective view of the state before upward rotation and (b) is a perspective view of the state after upward rotation. [Modes for carrying out the invention]

[0042] An embodiment of the present invention will be described below with reference to the drawings.

[0043] <Embodiment> Figures 1 to 8 show one embodiment of the cutting machine according to the present invention. Figure 1 is a perspective view showing the overall configuration of the cutting machine 1 according to this embodiment before the blade is attached.

[0044] As shown in Figure 1, the cutting machine 1 according to this embodiment has a main body 2 which is mounted on a trolley-shaped machine body 3 that can move on wheels (5A, 5B), and a drive source (not shown) and a power transmission unit (not shown) that transmits rotational force from the drive source to a rotating shaft 7 are mounted on this trolley-shaped machine body 3, and these are covered by an outer cover 4.

[0045] Furthermore, the rotating shaft 7 is positioned forward of the machine body 2 and is rotatable horizontally, with its end serving as the blade mounting section 8. A disc-shaped blade (not shown), selected according to the cutting surface, is detachably, i.e., interchangeably, mounted on this blade mounting section 8. This blade is pressed against the cutting surface, such as a road surface, and rotated at high speed while the machine body 2 moves forward, enabling continuous road cutting.

[0046] Furthermore, the main body 2 is rotatable at its front end, with the rear wheel 5A as the pivot point. Therefore, by pushing down the handle 6 at the rear of the main body 2 and raising the front end, the rotating shaft 7 at the front of the machine body 3 is displaced upward, and the blade (not shown) attached to the blade mounting part 8 at the end of the rotating shaft 7 can also be raised upward from its position relative to the cutting surface.

[0047] By covering the blade with the blade cover 20 up to the point where it contacts the surface to be cut, dust scattering and contact with the blade caused by cutting debris are prevented, thereby ensuring safety.

[0048] In this embodiment, the blade cover 20 is detachably attached to the machine body 2 via a blade cover mounting mechanism, thereby preventing dust from scattering into the surrounding area and contact with the blade from cutting debris generated during cutting, and thus ensuring safety.

[0049] Figure 2 is an overall perspective view of the blade cover 20 in this embodiment, viewed from the front. As shown in Figures 1 and 2, the blade cover 20 is configured such that a cover body 21, which consists of a semi-circular housing with two semi-circular disc-shaped members on the front (21A) side and the back (21B) side, is placed over the blade through its lower end opening 22 and mounted on the machine body 3 of the cutting machine 1. Wheels 23 are attached to the front and rear of this lower end opening 22 and move in accordance with the cutting movement of the machine body 2 of the cutting machine 1.

[0050] Furthermore, the front surface 21A of the cover body 21 is provided with an openable / closable window 27 with a lid, allowing for blade replacement, inspection, and maintenance while the blade cover 20 is attached.

[0051] Figure 7 shows the interlocking state of the blade cover 20 with respect to the upward movement of the main body 2 and the rotating shaft 7 in the cutting machine 1 according to this embodiment. The figure is shown with the cover of the opening / closing window 27 open so that the position of the rotating shaft 7 at each stage can be easily seen as the position of the blade mounting part 8.

[0052] Furthermore, the rear of the cover body 21 is provided with an outlet 28 that communicates with the inside of the body, and a suction hose H extending from the suction port 31 of the dust collector 30, which runs alongside the cutting machine 1, is connected to this outlet 28. As a result, dust from cutting debris generated inside the cover body 21 during the cutting operation is sucked in and collected by the dust collector 30.

[0053] In this embodiment, a brush 24 is provided around the entire circumference of the lower end opening 22. This brush 22 follows the fine irregularities of the cutting surface, effectively closing the gap with the surface and blocking dust from scattering outwards. As a result, the airtightness inside the blade cover 20 is further enhanced, preventing the suction negative pressure from the dust collector 30 from escaping to the outside, maximizing dust collection efficiency and maintaining a better dust collection function.

[0054] Figure 3 is a partial perspective view of the blade mounting side of the main body 2 of the cutting machine 1, viewed from the front. As shown in Figure 3, a hooking projection 9 is provided horizontally on the rear of the machine body 3, and an inverted U-shaped hook 29 integrally provided on the rear end of the cover body 21 is rotatably hooked onto this hooking projection 9. This allows the blade cover 20 mounted on the machine body 3 to rotate in accordance with the machine body 3, with the hooking portion as the pivot point.

[0055] As shown in Figure 4, the blade cover mounting mechanism in this embodiment mainly consists of a support plate 10 attached to a part of the machine body 3 located above the rotation axis 7 and extending upward, a rectangular tubular engaging member 12 that is detachably placed over the support plate 10 and is longer than the support plate 10 as shown in Figure 5, a frame portion 26 integrally protruding from the back surface 21B of the cover body 21 facing the machine body 3 and through which the engaging member 12 is slidably inserted, and the aforementioned inverted U-shaped hook 29.

[0056] As shown in Figure 6, the engaging member 12 is engaged simply by placing it over the support plate 10 from above. Therefore, as shown in Figure 1, once the engaging member 12 is fitted onto the support plate 10, the blade cover 20 can be easily and stably attached to the machine body 3 by simply hooking the inverted U-shaped hook 29 onto the latching projection 9 and inserting the engaging member 12 through the frame portion 26, while placing the blade cover 20 on top.

[0057] Furthermore, when removing the blade cover 20, it is a simple operation to detach the inverted U-shaped hook 29 from the latching projection 9 and lift it upwards to remove the engaging member 12 from the frame 26.

[0058] Furthermore, a long slit 25 is formed on the back surface 21B of the cover body 21, extending vertically below the frame portion 26, allowing the rotating shaft 7 to move up and down within this slit 25 when the blade cover 20 is installed.

[0059] In other words, as shown in Figures 7(a)(b) and 8(a), the rotating shaft 7 is allowed to move up and down within the range of motion provided by the slit 25, and the up and down movement of the main body 2 and the machine body 3 while the cutting machine 1 is running due to expected road surface irregularities does not affect the blade cover 20.

[0060] Furthermore, the engaging member 12, which is placed over the support plate 10 that moves up and down with the aircraft body 3, is inserted into the frame portion 26 on the back surface 21B of the cover body 21, and slides within the frame portion 26 in accordance with the up and down movement of the support plate 10. The sliding range of this engaging member 12 corresponds to the free movement range of the slit 25 that allows the up and down movement of the rotating shaft 7.

[0061] The engaging member 12 physically restrains the blade cover 20 by having its outer circumferential surface slidably contact the inner wall surface of the frame portion 26. Therefore, the horizontal distance of the blade cover 20 relative to the machine body 2 is always restricted via the engaging member 12 and the frame portion 26, so that lateral rattling relative to the machine body 3 is suppressed during operation, and its mounting state is stably maintained.

[0062] As a result, the displacement of the rotating shaft 7 due to the vertical movement of the machine body 3 is absorbed not only by the relief provided by the slit 25, but also by the sliding of the engaging member 12 within the frame portion 26. Therefore, even when the machine body 3 moves up and down within a predetermined range, the blade cover 20 is suppressed to move not only vertically but also horizontally. Consequently, the lower end opening 22, which is provided with brushes 24 around its entire circumference, is always in contact with the road surface (the surface to be cut), thus maintaining a high dust collection function.

[0063] Furthermore, in this embodiment, the support plate 10 has a support plate side projection 11 that protrudes horizontally from the lower side of the surface facing the main body 2, and the engaging member 12 has a concave notch 13 at its lower end opening edge that receives the support plate side projection 11, and an engaging projection 14 that protrudes adjacent to the inverted U-shaped hook 29 side of the notch 13 and is aligned with the support plate side projection 11.

[0064] These mutually adjacent support plate side projections 11 and engaging projections 14 come into integral contact with the lower edge of the frame portion 26 when the rotating shaft 7 reaches the upper end of the slit 25 as the tip side of the main body 2 rotates upward.

[0065] For example, when the rotating shaft 7 is raised significantly along with the tip of the main body 2 in order to move the cutting machine 1 with the blade attached, the lower edge of the frame portion 26 is pushed up by the support plate side projection 11 and the engaging projection 14, as shown in Figures 7(c) and 8(b), thereby positioning the frame portion 26 to rotate upward in conjunction with the entire blade cover 20.

[0066] Furthermore, by positioning the engaging projection 14 on the side of the inverted U-shaped hook 29, which is the pivot point, the upward force exerted by the support plate side projection 11 and the engaging projection 14 is transmitted smoothly and stably along the rotational trajectory at a position close to the pivot point.

[0067] This prevents unnecessary twisting between the frame 26 and the engaging member 12, while the support plate side projection 11 and the engaging projection 14 work together to reliably push up the heavy blade cover 20 and stably hold it in the raised position. This greatly contributes to more firmly suppressing rattling of the blade cover 20 during travel.

[0068] Thus, even after the entire blade cover 20 is rotated upward in conjunction with the upward rotation of the main body 2, the engaging member 12 remains inserted into the frame portion 26, and the horizontal positional restriction of the blade cover 20 relative to the aircraft body 3 continues.

[0069] Therefore, even while the cutting machine 1 is being moved with the blade cover 20 raised, lateral rattling and shaking of the blade cover 20 are suppressed, and a stable state is maintained, which contributes to the stability and safety of operation when the cutting machine 1 is being moved.

[0070] In the embodiments described above, a blade cover 20 for dry cutting that does not require cooling water was used as an example, but the scope of application of the present invention is not limited to this. For example, even a blade cover for wet cutting equipped with a water supply path for blade cooling can be similarly adapted for dry cutting by applying the present invention, as long as it is equipped with the blade cover mounting mechanism according to the present invention (support plate 10, engaging member 12, frame portion 26, inverted U-shaped hook 29, etc.) and has an outlet 28 that can be connected to a dust collector 30.

[0071] Furthermore, when used for wet cutting, the blade cover mounting mechanism of this invention provides the same advantages as the embodiments described above, as it enables both the suppression of dust and sludge scattering during wet cutting and the ease of attachment and detachment. [Explanation of Symbols]

[0072] 1: Cutting machine 2: Main unit 3: Aircraft 4: Exterior cover 5A,5B: Wheel 6: Handle 7: Rotation axis 8: Blade mounting section 9:Latching protrusion 10: Support plate 11: Support plate side protrusion 12: Engaging member 13: Notch 14: Engaging protrusion 20: Blade cover 21: Cover body 21A: Surface 21B: Back side 22: Bottom opening 23: Wheels 24: Brush 25: Slit 26: Frame 27: Openable window 28: Outlet 29: Inverted U-shaped hook 30: Dust collector 31: Suction port H: Suction hose

Claims

1. A cutting machine comprising: a main body having a drive source, a power transmission unit that transmits rotational force from the drive source to a rotating shaft, and an outer cover that covers these, mounted on a wheeled trolley-like body; a disc-shaped blade detachably attached to the rotating shaft; a blade cover that covers the blade and moves integrally with the main body on wheels with its lower end opening facing the surface to be cut; and a blade cover mounting mechanism that allows the blade cover to be detachably attached to the machine and to rotate in accordance with the vertical rotation of the tip of the main body, wherein the blade cover is provided with an outlet to which a suction hose of a dust collector that runs in parallel with the cutting machine and collects dust generated inside the blade cover as the blade cuts the surface to be cut, The blade cover mounting mechanism comprises a support plate attached to a portion of the machine body located above the rotation axis and extending upward, a rectangular tubular engaging member longer than the support plate and detachably placed over the support plate, a frame portion integrally projecting from the back surface of the blade cover facing the machine body and through which the engaging member is slidably inserted, and an inverted U-shaped hook integrally provided at the rear of the blade cover and rotatably engaged with a locking projection provided on the machine body as the pivot point during the follow-up rotation. The support plate has a support plate side projection that protrudes horizontally below the surface facing the main body, The engaging member has a concave notch at its lower end opening edge that receives the support plate side projection, and an engaging projection that protrudes adjacent to the inverted U-shaped hook side of the notch and is aligned with the support plate side projection. The cutting machine is characterized in that the blade cover has an elongated slit on its back surface that allows the rotation axis to move up and down, and when the rotation axis reaches the upper end of the slit due to the upward rotation of the front end of the main body, the adjacent support plate side projection and the engaging projection come into contact with the lower edge of the frame, and the frame is positioned such that, by further upward rotation of the front end of the main body, the blade cover is pushed upward via the frame, with the inverted U-shaped hook as the pivot point.

2. The cutting machine according to claim 1, characterized in that the blade cover is provided with a brush around the entire circumference of the lower end opening.

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