Desktop cutting machine

Abstract

The present invention provides a bench-type cutting machine. The cutting machine (1) has a slide bar (51), a sliding base (17) and a cutting machine main body (10). Among them, the slide bar (51) is elongated and extends in the front-rear direction; the sliding base (17) is mounted on the slide bar (51) and can move along the slide bar (51); the cutting machine main body (10) is mounted on the sliding base (17) in a manner that it can move in the up-down direction. The cutting machine main body (10) has an output shaft (27) and an electric motor (21). Among them, the output shaft (27) extends in an axial direction orthogonal to the slide bar (51) and is used for mounting a cutting tool (11); the electric motor (21) rotates the output shaft (27) and is located between the cutting tool (11) and the slide bar (51) when viewed from the front in a state where the cutting tool (11) is vertical. Accordingly, it is possible to realize a bench-type cutting machine with good visibility of the cutting position of a cutting tool required in the past.

Description

Technical Field

[0001] The present invention relates to a table saw for cutting workpieces such as wood Background Art

[0002] Such a table saw has, for example, a long slide bar and a sliding base mounted on the slide bar and movable along the slide bar. A saw body is mounted on the sliding base. The saw body has an electric motor and a cutter that rotates using the electric motor as a power source. The saw body is supported by the sliding base so as to be movable in the vertical direction intersecting the extending direction of the slide bar. By moving the saw body toward the workpiece placed below, the cutter can be inserted into the workpiece. Further, the saw body is moved along the extending direction of the slide bar. Accordingly, the cutter can be moved relative to the workpiece along the extending direction of the slide bar. By moving the cutter relative to the workpiece in this way, the cutting work of the workpiece can be performed.

[0003] In order not to obstruct the movement of the cutter, the slide bar is disposed at a position to the right of the right side surface of the cutter or to the left of the left side surface of the cutter when observed from a user located in the front side of the table saw. In the invention described in Patent Document 1, a slide bar extending along the side surface of the cutter is provided at a position to the right of the right side surface of the cutter. The motor housing that houses the electric motor is disposed above the cutter and protrudes leftward, i.e., to the side opposite to the slide bar, with respect to the cutter. When the user visually confirms the cutting position of the cutter relative to the workpiece, the leftward protruding portion of the motor housing sometimes obstructs visibility. Therefore, the user sometimes needs to lower his / her head to visually confirm the cutting position.

[0004] In the invention described in Patent Document 2, a slide bar extending along the side surface of the cutter is provided at a position to the left of the left side surface of the cutter. The motor housing that houses the electric motor is disposed on the right side of the cutter and is disposed in an inclined posture in a state perpendicular to the cutter. The inclination direction of the motor housing is a direction that slopes upward as it moves away from the cutter toward the right side when observed from the front side. When the user visually confirms the cutting position of the cutter relative to the workpiece, the slide bar located on the left side of the cutter sometimes obstructs visibility. Therefore, the user sometimes needs to lower his / her head to visually confirm the cutting position.

[0005] [Prior Art Documents]

[0006] [Patent Documents]

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2005-279933 Patent Document 2: Japanese Patent Application Laid-Open No. 2018-89867 Summary of the Invention

[0008] [Technical Problem to be Solved by the Present Invention]

[0009] As described above, in a tabletop cutting machine, there is room for improvement in order to improve the visibility of the cutting position of the cutting tool. Therefore, there is a need in the prior art for a tabletop cutting machine with good visibility of the cutting position of the cutting tool.

[0010] [Technical solution for solving the above technical problems]

[0011] According to a feature of the present invention, a tabletop cutting machine has an elongated slide bar, a sliding base, and a cutting machine main body. Among them, the slide bar extends in the front-rear direction; the sliding base is mounted on the slide bar and can move along the slide bar; the cutting machine main body is mounted on the sliding base in a manner that can move in the up-down direction. The cutting machine main body has an output shaft and an electric motor. Among them, the output shaft extends in an axial direction orthogonal to the slide bar and is used for mounting a cutting tool; the electric motor rotates the output shaft and is located between the cutting tool and the slide bar when viewed from the front in a state where the cutting tool is vertical.

[0012] Therefore, the slide bar and the electric motor are arranged on one side (for example, the right side) with respect to the cutting tool. Therefore, it is possible to provide a tabletop cutting machine without a structure protruding toward the other side (for example, the left side) with respect to the cutting tool. Accordingly, it is possible to improve the visibility of the cutting position of the cutting tool on the other side with respect to the cutting tool. Description of the drawings

[0013] Figure 1 It is an overall perspective view of the tabletop cutting machine according to the first embodiment as viewed from the right.

[0014] Figure 2 It is an overall perspective view of the tabletop cutting machine as viewed from the left.

[0015] Figure 3 It is a left view of the tabletop cutting machine in a state where the cutting machine main body is at the top dead center.

[0016] Figure 4 It is a right view of the tabletop cutting machine in a state where the cutting machine main body is at the top dead center.

[0017] Figure 5 It is a top view of the tabletop cutting machine in a state where the cutting machine main body is at the top dead center.

[0018] Figure 6 It is a front view of the tabletop cutting machine in a state where the cutting machine main body is at the top dead center.

[0019] Figure 7 It is along Figure 4 in the sectional view taken along VII-VII, and is a cross-sectional view of the cutting machine main body.

[0020] Figure 8 It is alongFigure 4 The sectional view taken along VIII-VIII, and it is a sectional view of the cutter main body.

[0021] Figure 9 It is along Figure 4 The sectional view taken along IX-IX, and it is a transverse sectional view of the cutter main body.

[0022] Figure 10 It is a left view including a partial longitudinal section of the bench cutter.

[0023] Figure 11 It is a bottom view including a partial transverse section of the bench cutter with the base removed.

[0024] Figure 12 It is along Figure 10 The sectional view taken along XII-XII, and it is a longitudinal sectional view of the arm support part and the main body support arm.

[0025] Figure 13 It is a right view of the bench cutter in the state where the cutter main body is at the bottom dead center.

[0026] Figure 14 It is a left view of the bench cutter in the state where the cutter main body is at the bottom dead center and the movable cover moves upward.

[0027] Figure 15 It is a front view of the bench cutter in the state where the cutter main body is at the bottom dead center.

[0028] Figure 16 It is a front view of the bench cutter in the state where the cutter main body tilts to the left.

[0029] Figure 17 It is a front view of the bench cutter in the state where the cutter main body tilts to the right.

[0030] Figure 18 It is a right view of the bench cutter in the state where the cutter main body tilts to the right.

[0031] Figure 19 It is a right view of the bench cutter in the state where the cutter main body moves backward and is at the bottom dead center.

[0032] Figure 20 It is a left view of the bench cutter in the state where the cutter main body moves backward and is at the top dead center.

[0033] Figure 21 It is an overall perspective view of the bench cutter according to the second embodiment as viewed from the left.

[0034] Figure 22It is a top view of a bench-type cutting machine with the cutting machine main body at the top dead center.

[0035] Figure 23 It is a rear view of a bench-type cutting machine with the cutting machine main body at the top dead center.

[0036] Figure 24 It is a right view showing the state of the cutting machine main body of the bench-type cutting machine according to the third embodiment at the bottom dead center.

[0037] Figure 25 It is a left view showing the state of the cutting machine main body at the bottom dead center.

[0038] Figure 26 It is a top view showing the state of the cutting machine main body at the bottom dead center.

[0039] Figure 27 It is along Figure 26 a sectional view taken along XXVII-XXVII in [the figure], and it is a partial longitudinal sectional view of the motor housing and the gearbox.

[0040] Figure 28 It is along Figure 24 a sectional view taken along XXVIII-XXVIII in [the figure], and it is a longitudinal sectional view of the cutting machine main body.

[0041] [Explanation of reference numerals]

[0042] 1: Cutting machine (bench - type cutting machine); 2: Base; 2a: Rotating support shaft; 2b: Horizontal plate part; 3: Auxiliary workbench; 4: Rotary worktable; 4a: Upper surface of the worktable; 4b: Arm support part; 4c: Tilt stop bolt; 5: Worktable extension part; 5a: Knife - edge plate; 5b: Slot hole; 11: Tool; 12: Fixed cover; 12a: Arrow; 12b: Hole part; 13: Movable cover; 14: Fixed screw; 15: Outer flange; 16: Inner flange; 17: Sliding base; 17a: Lower dead - point stopper contact part; 17b: Upper dead - point stopper contact part; 18: Dust collection guide; 18a: Dust discharge port; 19: Lower dead - point stopper; 19a: Protrusion; 19b: Bolt; 19c: Center; 20: Motor housing; 20a: Air inlet; 20b: Exhaust port; 20c: Hole part; 21: Electric motor; 21a: Motor shaft; 21b: Stator; 21c: Rotor; 21d: Sensor substrate; 21e: Driving side bevel gear; 22: Fan; 23: Upper dead - point stopper; 25: Gearbox; 25a: First opening; 25b: Second opening; 25c, 25d: Hole parts; 26: Intermediate shaft (power transmission shaft); 26a: Driven side bevel gear; 26b: Reduction gear; 26c: Key; 26d: Washer; 26e: Rubber ring; 26f: Washer; 26g: Retaining ring; 27: Output shaft (power transmission shaft); 27a: Reduction gear; 28a: First bearing; 28b: Second bearing; 28c: Third bearing; 28d: Fourth bearing; 28e: Fifth bearing; 28f: Sixth bearing; 29: Bearing housing; 29a, 29b: Hole parts; 30: Controller housing; 30a: Air inlet; 30b: Communication port; 31: Controller; 32: Battery mounting part; 33: Battery; 34: Rubber pin; 35: Polyurethane washer; 36: Rubber ring; 37: Washer; 38: Lower dead - point locking pin; 40: Handle part; 41: Operating handle; 41a: Center; 42: Switch operating handle; 43: Locking button; 44: Handle; 44a: First connection part; 44b: Second connection part; 45: Switch (for laser irradiator); 46: Switch (for lighting fixture lighting); 47: Laser irradiator; 48: Lighting fixture; 48a: Arm; 49: Communication adapter; 50: Main body support arm; 50a: Left - right tilting support shaft; 51: Slide bar, 51a: First rod; 51b: Second rod; 51c, 51d: Center; 51e, 51f: Diameter; 51g: Center - to - center distance; 52: Maximum tilt angle switching operating handle; 52a: Operating handle shaft; 52b: Opposite width part; 60: Rotary worktable fixing mechanism; 61: Grip part; 62: Fixed rod; 63: Clamping part; 63a: Rotating shaft; 63b: Clamping part; 65: Positive lock mechanism; 66: Lock release operating handle; 66a: Positioning pin; 66b: Engagement pin; 66c: Compression spring; 67: Pin support part; 68: Adjusting bolt;70: Tilting fixing mechanism; 71: Tilting fixing operation part; 72: Reduction gear part; 73: Transmission shaft; 74: Thrust needle bearing; 75: Bearing part; 76: Nut; 80: Cutting machine (bench - type cutting machine); 81: Controller housing; 82: Controller; 83: Bridging part; 84: Battery mounting part; 90: Cutting machine (bench - type cutting machine); 91: Cutting machine main body; 91a: Vertical swing support shaft; 91b: Fitting pin; 92: Motor housing; 92a: Air inlet; 92b: Protrusion; 92c: Exhaust port; 92d: Rib; 92e: Fitting hole; 92f: Hole part; 92g: Protrusion; 93: Gearbox; 93a: First opening; 93b: Hole part; 93c: Protrusion; 93d: Curved surface; 93e: Inner - peripheral front end face; 94: Second bottom dead center stopper; 95: Release operation lever; 96: Grooving depth adjustment screw; 97: Tilting support shaft; S1: First virtual plane; S2: Second virtual plane.; Detailed implementation mode

[0043] According to other features of the present invention, the electric motor has a motor shaft. When viewed from the radial direction of the motor shaft in the state where the cutting tool is vertical, the motor shaft is parallel to the side surface of the cutting tool or inclined by 10° or less with respect to the side surface. Therefore, the motor shaft can be arranged in a posture along the side surface of the cutting tool. Accordingly, the electric motor can be arranged close to the cutting tool. Thereby, the cutting tool and the electric motor are compactly arranged in the left - right direction. In this way, the cutting machine main body can be compactly arranged in the left - right direction.

[0044] According to other features of the present invention, the center of the electric motor is arranged at a position of 30% - 50% of the distance from the cutting tool to the slide bar in the direction perpendicular to the surface of the cutting tool with the cutting tool as the starting point. Therefore, the center of the electric motor is set closer to the cutting tool than the slide bar. Accordingly, the center of gravity of the cutting machine main body in the left - right direction can be made closer to the cutting tool. Thereby, when the cutting machine main body is moved downward to cut the workpiece to be cut, the torque generated by the reaction force from the workpiece to be cut received by the cutting tool and the self - weight of the cutting machine main body can be reduced.

[0045] According to other features of the present invention, the slide bar has one rod or a plurality of rods arranged side by side. When the cutting machine main body is at the bottom dead center, when viewed from the axial direction, at least one of the one rod or the plurality of rods is located at a position overlapping with the electric motor. Therefore, when the cutting machine main body is at the bottom dead center, the electric motor can be arranged at a lower position. Accordingly, the protruding amount of the electric motor upward can be suppressed. Thereby, the bench - type cutting machine is compactly arranged. In addition, when the cutting machine main body is tilted in the left - right direction to cut the workpiece to be cut, the upper part of the electric motor can be prevented from obstructing the visibility of the cutting position.

[0046] According to other features of the present invention, at least one rod is located at the lowest position among the plurality of rods. Therefore, an electric motor can be arranged near the lowest point where the electric motor can be configured. Therefore, the amount of protrusion of the electric motor upward can be suppressed to a minimum. Accordingly, the bench-type cutting machine can be appropriately made compact.

[0047] According to other features of the present invention, the plurality of rods include a first rod located at the uppermost position and a second rod located at the lowermost position. When the diameter of the first rod is set to a [mm], the diameter of the second rod is set to b [mm], the distance between the centers of the first rod and the second rod is set to c [mm], and the diameter of the cutting tool is set to d [mm], the relationship of (a / 2 + b / 2 + c) × 2 < d < (a / 2 + b / 2 + c) × 3.5 is satisfied. Therefore, the plurality of rods can be compactly accommodated in the vertical direction within a length shorter than half of the diameter of the cutting tool. Moreover, the vertical distance including all of the plurality of rods is larger than 2 / 7 times the diameter of the cutting tool. Therefore, the plurality of rods can be arranged to have sufficient strength to support the cutting machine main body. In this way, both the compactness and the supporting strength of the sliding structure of the cutting machine main body can be achieved.

[0048] According to other features of the present invention, when cutting a workpiece with the cutting tool, the cutting machine main body slides along the slide rod in the traveling direction. The electric motor has a motor shaft. The motor shaft is oriented at an inclined angle such that when the cutting machine main body is at the bottom dead center, the motor shaft inclines upward as it faces the traveling direction. The amount of protrusion of the electric motor downward can be suppressed to a minimum when the cutting machine main body is at the bottom dead center. Accordingly, the bench-type cutting machine can be compactly arranged in the vertical direction.

[0049] According to other features of the present invention, when the cutting machine main body is at the bottom dead center, the inclined angle of the motor shaft is 30° to 60° with respect to the horizontal line. Therefore, it is possible to prevent the motor housing accommodating the electric motor from coming into contact with the workpiece. Therefore, the workpiece can be appropriately cut using the compactly arranged bench-type cutting machine.

[0050] According to other features of the present invention, when the cutting machine main body is at the top dead center, the motor shaft is parallel to the horizontal line or has an inclined angle of 10° or less with respect to the horizontal line. Therefore, the amount of protrusion of the electric motor upward or downward can be suppressed. Accordingly, it is possible to prevent the visibility when confirming the cutting position of the cutting tool from being obstructed.

[0051] According to other features of the present invention, the bench-type cutting machine has an operation handle used when moving the cutting machine main body relative to the slide bar. When viewed from the front in the state where the cutting tool is vertical, the center of the operation handle is located on the virtual plane including the cutting tool or between the slide bar and the cutting tool. Therefore, the centers of the slide bar and the operation handle can be brought closer in the left-right direction. Accordingly, when the user holds the operation handle and cuts the workpiece with the cutting tool, the torque of the cutting machine main body relative to the slide bar can be reduced. Also, the centers of the cutting tool and the operation handle can be brought closer in the left-right direction. Therefore, when the user holds the operation handle and cuts the workpiece with the cutting tool, the torque generated by the reaction force from the workpiece received by the cutting tool and the operation force for operating the operation handle can be reduced.

[0052] According to other features of the present invention, the center of the operation handle is arranged at a position of 30% to 70% of the distance from the cutting tool to the slide bar in the direction perpendicular to the plane of the cutting tool starting from the cutting tool. Therefore, the center of the operation handle is arranged at a position not too far from both the cutting tool and the slide bar. Accordingly, the torque of the cutting machine main body acting between the cutting tool and the operation handle can be reduced. Moreover, the deflection of the slide bar caused by the operation force for operating the operation handle can be suppressed.

[0053] According to other features of the present invention, the bench-type cutting machine has a lower dead center stopper that restricts the cutting machine main body from moving to a position lower than the lower dead center. When viewed from the front in the state where the cutting tool is vertical, the center of the lower dead center stopper is located between the slide bar and the cutting tool. Therefore, the distance between the center of the lower dead center stopper and the slide bar can be shortened. The lower dead center stopper receives a reaction force when the cutting machine main body descends to the lower dead center. Therefore, by shortening the distance, the torque of the cutting machine main body relative to the slide bar caused by the reaction force can be reduced.

[0054] According to other features of the present invention, the center of the lower dead center stopper is arranged at a position of 30% to 70% of the distance from the cutting tool to the slide bar in the direction perpendicular to the plane of the cutting tool starting from the cutting tool. Therefore, the center of the lower dead center stopper is arranged at a position not too far from both the cutting tool and the slide bar. Accordingly, the torque of the cutting machine main body acting between the reaction force received by the lower dead center stopper and the slide bar can be reduced, and the shaking of the cutting tool caused by the torque can be suppressed.

[0055] According to other features of the present invention, the bench-type cutting machine has an operation handle used when moving the cutting machine main body relative to the slide bar. The bench-type cutting machine has a movable cover that covers a part of the cutting tool and is movable relative to the cutting machine main body. The bench-type cutting machine has a carrying handle that is used when carrying the bench-type cutting machine and has a structure different from that of the operation handle. The carrying handle extends across the movable area of the movable cover. Therefore, the carrying handle can be compactly arranged in a manner that does not obstruct the visibility of the cutting position, and can be arranged in a manner that does not obstruct the operation of the movable cover.

[0056] According to other features of the present invention, the bench-type cutting machine has a power transmission shaft that extends in a direction intersecting the motor shaft of the electric motor and is arranged on the power transmission path from the motor shaft to the cutting tool. The bench-type cutting machine has: a gear that is mounted on the motor shaft or the power transmission shaft; and a gear box that houses the gear. The gear box has: a first opening through which the motor shaft passes; and a second opening that opens in a direction intersecting the opening direction of the first opening and through which the power transmission shaft passes. The gear box is formed of one component. Therefore, the gear box houses at least a part of the motor shaft, at least a part of the power transmission shaft, and the gear that extend in different directions from each other and is formed compactly. Accordingly, the main body of the cutting machine can be compactly arranged in the left-right direction and the front-back direction. In addition, by being formed of one component, the strength of the gear box can be improved.

[0057] According to other features of the present invention, the gear box supports a set of gears that connect the motor shaft and the power transmission shaft, and the set of gears is bevel gears. Therefore, power can be transmitted from the motor shaft extending in the front-back direction to the power transmission shaft extending in the left-right direction through a set of bevel gears. Therefore, the gear box that supports the set of bevel gears can be formed compactly in the left-right direction and the front-back direction.

[0058] According to other features of the present invention, the main body of the cutting machine has an exhaust port that is arranged at the same front-back position as the electric motor or at a position in front of the electric motor and opens rearward. The exhaust air after cooling the electric motor is discharged from the exhaust port. Therefore, it is possible to suppress the exhaust air from being discharged toward the user side in front of the bench-type cutting machine. Therefore, it is possible to suppress the chips from flying toward the user. In addition, when the main body of the cutting machine is tilted in the left-right direction to perform oblique cutting, it is possible to suppress the exhaust air from being discharged toward the workpiece to be cut below the electric motor. Therefore, it is possible to suppress the chips from being lifted on the workpiece to be cut.

[0059] According to other features of the present invention, the exhaust air discharged from the exhaust port is parallel to the cooling air that is cooling the electric motor and flows in a direction opposite to that of the cooling air. Therefore, the intake port is arranged behind the electric motor. Therefore, it is possible to suppress the chips floating near the intake port from being sucked into the intake port. Moreover, the exhaust air is parallel to the cooling air flowing in the axial direction of the electric motor and flows in a direction opposite to that of the cooling air. Therefore, the exhaust air is discharged in such a manner that it does not separate from the motor housing that houses the electric motor in the up-down direction or the left-right direction. Accordingly, it is possible to further suppress the scattering of the chips on the workpiece to be cut.

[0060] According to other features of the present invention, the bench-type cutting machine has a controller that controls the output of the electric motor. The controller is located above the electric motor when the cutting machine main body is at the bottom dead center. Therefore, the controller can be arranged in such a way that the cutting machine main body is compactly arranged in the left-right direction. And the amount of protrusion of the controller downward can be suppressed. Therefore, when the cutting machine main body is at the bottom dead center, it is possible to prevent the controller housing accommodating the controller from coming into contact with the workpiece to be cut.

[0061] According to other features of the present invention, there is a controller for controlling the output of the electric motor. When the cutting machine main body is at the bottom dead center, the controller and the electric motor overlap in the left-right direction. Therefore, the controller and the electric motor can be compactly arranged in the left-right direction.

[0062] According to other features of the present invention, the bench-type cutting machine has: a fan that rotates by the electric motor to generate wind for cooling the electric motor; and a controller that controls the output of the electric motor. The controller is cooled by the wind generated by the fan. Therefore, both the electric motor and the controller can be efficiently cooled by the fan.

[0063] Based on Figures 1 to 20 The first embodiment of the present invention will be described. In this embodiment, a cutting machine (bench-type cutting machine) 1 called a so-called sliding circular saw is exemplified. As Figure 1 shown, the cutting machine 1 has: a base 2 that is placed on a table or the ground, etc.; a rotary table 4 for placing the workpiece to be cut; and a cutting machine main body 10. The rotary table 4 is supported above the base 2 in such a way that it can rotate in the horizontal direction around a rotary shaft 2a (see Figure 10 ). The cutting machine main body 10 is provided above the rotary table 4. A substantially disc-shaped cutting tool 11 called a tipped saw blade is rotatably supported on the cutting machine main body 10. The user is located near the cutting machine 1 to perform a cutting operation. In the following description, the up-down, left-right directions of the components and structures are defined based on the user. For the front-back direction of the components and structures, the front side is the near side when observed from the user.

[0064] As Figure 2 , Figure 3As shown, when the rotary table 4 is viewed from above, it is generally circular, and the upper surface 4a of the table is horizontally arranged. The rotary table 4 has a rotation center at the center of a generally circular plate shape and can rotate in the horizontal direction. The base 2 has auxiliary tables 3 with the same upper surface height as the upper surface 4a of the rotary table 4 on the left and right sides of the rotary table 4. The rotary table 4 has a table extension 5 extending along the face direction of the cutting tool 11. A cutting edge plate 5a is provided on the upper surfaces of the rotary table 4 and the table extension 5. A notch-shaped slot 5b extending along the face of the cutting tool 11 is provided at the center of the cutting edge plate 5a.

[0065] As Figure 1 shown, an adjusting bolt 68 that supports the table extension 5 from below is provided below the table extension 5. The adjusting bolt 68 is supported by the table extension 5 and can move up and down by a threading operation. By moving the adjusting bolt 68 up and down, the lower end of the adjusting bolt 68 is brought into contact with the mounting surface of the base 2. Accordingly, the adjusting bolt 68 can adjust the height of the table extension 5. In addition, the looseness in the setting of the table extension 5 is eliminated.

[0066] As Figure 1 、 Figure 3 shown, a positioning baffle 6 in the shape of a wall extending in the left-right direction and upward is provided above the rotary table 4 and the auxiliary tables 3. The positioning baffle 6 is supported by the left and right auxiliary table plates 3. The front surface, i.e., the positioning surface 6a, of the positioning baffle 6 is located on the vertical plane passing through the rotation center of the rotary table 4. The workpiece to be cut placed on the rotary table 4 is positioned in the front-rear direction by contacting the positioning surface 6a.

[0067] As Figure 1 、 Figure 3 shown, an arc-shaped miter scale plate 7 is provided in a region of approximately a half circumference at the front of the base 2. The miter scale plate 7 is provided at a position below the upper surface 4a of the table and extends horizontally. A plurality of groove-shaped positioning recesses 7b extending in the radial direction are provided on the miter scale plate 7. The positioning recesses 7b are provided at a prescribed angular interval in the circumferential direction of the miter scale plate 7. The tip of a positioning pin 66a described later can enter the positioning recess 7b. The miter scale plate 7 is fixed to the base 2 by fixing screws 7a. The fixing screws 7a are inserted into long holes. By loosening the fixing screws 7a and moving the miter scale plate 7 in the left-right direction, the angles of the positioning baffle 6 and the cutting tool 11 can be finely adjusted. For example, as long as the positioning pin 66a is inserted into the positioning recess 7b at a right angle position, the right angle between the cutting tool 11 and the positioning baffle 6 can be precisely adjusted. This adjustment is mainly carried out during the production process of the product.

[0068] As Figure 1 、Figure 6 As shown, a main body support arm 50 that extends substantially upward is provided behind the rotary table 4. The main body support arm 50 is supported so as to be able to swing in the left-right direction relative to the rotary table 4 about a left-right swing support shaft 50a that extends in the front-rear direction. The main body support arm 50 is substantially inclined to the right as it faces upward when the cutting tool 11 is vertical. As Figure 19 , Figure 20 shown, the main body support arm 50 is formed in a shape that retracts from the movable areas of the cutting machine main body 10 and the battery 33 mounted on the battery mounting portion 32 when a sliding base 17 described later is moved to the rear end.

[0069] As Figure 1 , Figure 6 shown, a long slide bar 51 that extends along the cutting surface of the cutting tool 11 and extends along the horizontal line is provided at the upper part of the main body support arm 50. The slide bar 51 has an upper first bar 51a and a lower second bar 51b arranged side by side in the up-down direction. A sliding base 17 is mounted on the first bar 51a and the second bar 51b so as to be slidable in the front-rear direction. The cutting machine main body 10 is connected to the left side of the sliding base 17. Therefore, the cutting machine main body 10 is located at a position to the left of the first bar 51a and the second bar 51b when the cutting tool 11 is vertical. By sliding the sliding base 17 in the front-rear direction, it is possible to cut, for example, a wide workpiece placed on the rotary table 4.

[0070] As Figure 5 , Figure 6 , Figure 13As shown, the first rod 51a is formed into a cylindrical shape with a diameter 51e of, for example, 20 mm. The second rod 51b is formed into a cylindrical shape with a diameter 51f of, for example, 25 mm, which is larger than the diameter 51e. The center 51c of the first rod 51a and the center 51d of the second rod 51b extend in the front-rear direction parallel to each other. The positions of the center 51c of the first rod 51a and the center 51d of the second rod 51b in the left-right direction are, for example, the same position. Further, a virtual plane passing through the center in the thickness direction of the base of the tool 11 and extending in the same direction as the base of the tool 11 is defined as the first virtual plane S1. A virtual plane passing through the center 51c of the first rod 51a and the center 51d of the second rod 51b is defined as the second virtual plane S2. The first virtual plane S1 and the second virtual plane S2 are, for example, parallel. The distance between the first virtual plane S1 and the second virtual plane S2 is, for example, 115 mm. The center 51c of the first rod 51a and the center 51d of the second rod 51b are arranged with a center-to-center distance 51g of, for example, 55 mm in the up-down direction. The diameters 51e, 51f, and the center-to-center distance 51g are set in such a way that, when the diameter 51e is set as a [mm], the diameter 51f is set as b [mm], the center-to-center distance 51g is set as c [mm], and the diameter of the tool 11 is set as d [mm], the following relationship of (Equation 1) is satisfied. In the case of the cutting machine 1 equipped with a tool 11 having a diameter of, for example, 190 mm, the diameters 51e, 51f, and the center-to-center distance 51g are set so that 54 [mm] < [a / 2 + b / 2 + c) < 95 [mm].

[0071] (Equation 1) (a / 2 + b / 2 + c) × 2 < d < (a / 2 + b / 2 + c) × 3.5

[0072] As Figure 12 shown, the arm support portion 4b has a pair of left and right inclined stop bolts 4c. The tip of the inclined stop bolt 4c protrudes into the arm support portion 4b. The protruding amount of the inclined stop bolt 4c can be adjusted by rotating the inclined stop bolt 4c around its axis using a hex wrench or the like. This adjustment is mainly carried out during the production process of the product.

[0073] As Figure 10 、 Figure 12As shown, a maximum tilt angle switching operation handle 52 is provided at the lower rear side of the main body support arm 50. The maximum tilt angle switching operation handle 52 has an operation handle shaft 52a that is parallel to the left and right tilting support shafts 50a and extends forward. The operation handle shaft 52a has a cylindrical shape. At the front part of the operation handle shaft 52a, there is a facing width part 52b formed by two planes that are parallel to the axial direction and in an axially symmetric positional relationship. By tilting the main body support arm 50 to the left and right, the front part of the operation handle shaft 52a abuts against the tilt stop bolt 4c. By rotating the maximum tilt angle switching operation handle 52 around the axis of the operation handle shaft 52a, the part of the operation handle shaft 52a that abuts against the tilt stop bolt 4c is switched.

[0074] As Figure 10 , Figure 12 shown, the main body support arm 50 can be tilted in the left and right directions to an angle A where the operation handle shaft 52a abuts against either the left or right tilt stop bolt 4c. When the tilt stop bolt 4c abuts against the part of the operation handle shaft 52a with an arc-shaped cross-section, the cutting tool 11 can be tilted to a maximum of 45° to the left and right respectively. When the tilt stop bolt 4c abuts against the facing width part 52b, the cutting tool 11 can be tilted to a maximum of, for example, 46° to the left and right respectively. By tilting the cutting tool 11 to the left and right, so-called diagonal cutting can be performed on the workpiece placed on the rotary table 4.

[0075] As Figure 3 , Figure 14 shown, the cutting tool 11 is rotatably mounted on the cutting machine main body 10 with the cutting surface extending in the front-rear direction. The cutting machine main body 10 has an up-and-down swing support shaft 10a with an axial direction extending in the left and right direction behind the cutting tool 11. The cutting machine main body 10 can swing in the up-and-down direction relative to the sliding base 17 with the up-and-down swing support shaft 10a as the center. By swinging the cutting machine main body 10 downward, the cutting tool 11 can be inserted into the workpiece placed on the rotary table 4. When the lower dead point is set to 0°, the upper dead point of the swing angle of the cutting machine main body 10 in the up-and-down direction is 40°. In other words, the cutting machine main body 10 can swing within an angle range of 40°.

[0076] As Figure 2 , Figure 3 , Figure 14As shown, the cutting machine main body 10 has a fixed cover 12 and a movable cover 13. The fixed cover 12 covers the upper half circumference range of the cutter 11 from the left and right sides and the radially outer side. On the left side of the fixed cover 12, a hollow arrow 12a indicating the rotation direction of the cutter 11 is shown. The movable cover 13 can cover the lower half circumference range of the cutter 11. The movable cover 13 rotates in linkage with the vertical swing of the cutting machine main body 10 to open and close the lower half circumference of the cutter 11. When the cutting machine main body 10 swings upward, the movable cover 13 rotates in the closing position direction ( Figure 3 clockwise direction in Figure 14 ). Accordingly, the lower half circumference range of the cutter 11 is covered. When the cutting machine main body 10 swings downward, the movable cover 13 rotates in the opening position direction (

[0077] counterclockwise direction in Figure 7 ). Accordingly, the lower half circumference range of the cutter 11 is exposed, so that the work piece to be cut placed on the rotary table 4 can be cut.

[0078] As Figure 2 shown, the cutter 11 is integrally mounted on the output shaft 27 which extends in the left-right direction and is rotatably supported by the cutting machine main body 10. The cutter 11 is mounted on the output shaft 27 by screwing in the fixing screw 14 in a state where it is clamped by the outer flange 15 and the inner flange 16 at the rotation center.

[0079] As Figure 6 、 Figure 19As shown in the figure, a lower dead center stopper 19 is provided on the right side of the cutting machine main body 10. The lower dead center stopper 19 is composed of a protruding portion 19a and a bolt 19b. The protruding portion 19a is installed on the right side surface of the fixed cover 12 and protrudes to the right; the bolt 19b penetrates the protruding portion 19a in the vertical direction. A through hole with an internal thread formed in the vertical direction is provided in the protruding portion 19a. The bolt 19b is screwed into the through hole with the thread top facing downward and the thread head facing upward. A synthetic resin for preventing loosening is applied to the thread teeth of the bolt 19b. The height of the thread top of the bolt 19b is changed by changing the screwing position of the bolt 19b. The change of the screwing position of the bolt 19b is performed by inserting a hexagon wrench into the hexagonal hole of the head and rotating it. Accordingly, the position of the lower dead center of the cutting machine main body 10 can be finely adjusted. The lower dead center stopper 19 is located between the side surface of the cutter 11 and the slide bar 51 in the left-right direction. A lower dead center stopper abutting portion 17a is provided on the front surface of the sliding base 17. When the cutting machine main body 10 is lowered to the lower dead center, the lower dead center stopper abutting portion 17a abuts against the thread top of the bolt 19b of the lower dead center stopper 19.

[0080] As Figure 2 , Figure 10 , Figure 14As shown, a grooving depth adjustment screw 96 is provided on the left side of the rear part of the fixed cover 12. An unlocking operation handle 95 is disposed adjacent to the grooving depth adjustment screw 96. The unlocking operation handle 95 is connected to the sliding base 17 so as to be tiltable in the left-right direction about its rear end. The unlocking operation handle 95 can tilt about a tilting pivot 97 between an initial position and an unlocking position, where the initial position means the position where the unlocking operation handle 95 extends in the front-rear direction following the fixed cover 12; the unlocking position means the position where the front end of the unlocking operation handle 95 moves away from the fixed cover 12 to the left. A recess into which the lower end of the grooving depth adjustment screw 96 can enter is formed on the upper surface of the unlocking operation handle 95. When the unlocking operation handle 95 is in the initial position, the lower end of the grooving depth adjustment screw 96 can enter the recess from above. Therefore, when the unlocking operation handle 95 is in the initial position, the cutting machine main body 10 can be lowered to the lower dead point where the lower end of the grooving depth adjustment screw 96 enters the recess and the lower dead point stopper 19 abuts against the lower dead point stopper abutting portion 17a. When the unlocking operation handle 95 is in the unlocking position, the lower end of the grooving depth adjustment screw 96 cannot enter the recess of the unlocking operation handle 95 and abuts against the upper surface of the unlocking operation handle 95. Therefore, when the unlocking operation handle 95 is in the unlocking position, the lower dead point of the cutting machine main body 10 is set at a position higher than the lower dead point set by the lower dead point stopper 19 (the position where the lower end of the cutter 11 is above the upper surface of the workbench 4a). The grooving depth adjustment screw 96 has an external thread shape extending in the vertical direction. The grooving depth adjustment screw 96 is threadedly connected to the fixed cover 12 so as to be movable in the vertical direction. By rotating the grooving depth adjustment screw 96, the height of the lower end of the grooving depth adjustment screw 96 moves up and down relative to the fixed cover 12. For example, knurling is formed on the head of the grooving depth adjustment screw 96. In addition, a synthetic resin for preventing loosening is not applied to the external thread portion of the grooving depth adjustment screw 96. Therefore, the grooving depth adjustment screw 96 can be rotated by hand force for operation. A hexagonal hole is formed on the end surface of the head of the grooving depth adjustment screw 96. Therefore, it can also be rotated with an Allen wrench.

[0081] As Figure 6 , Figure 19As shown, the bottom dead center stopper contact portion 17a is a flat surface provided on the upper surface of a protrusion that protrudes forward from the front surface of the sliding base 17. Accordingly, it is possible to prevent the cutting machine main body 10 from descending to a position below the bottom dead center. Further, an upper dead center stopper 23 is provided below the bottom dead center stopper 19 and at the lower part of the right side surface of the fixed cover 12. The upper dead center stopper 23 is formed of a rubber sleeve and is screwed to the fixed cover 12. The upper dead center stopper contact portion 17b is provided on a flat surface provided on the lower surface of the protrusion. By the upper dead center stopper 23 coming into contact with the upper dead center stopper contact portion 17b, the upper dead center of the cutting machine main body 10 is positioned.

[0082] As Figure 6 shown, in a state where the cutting tool 11 is vertical and the cutting machine main body 10 is at the upper dead center, the center 19c of the bottom dead center stopper 19 extending in the vertical direction is located to the right of the cutting tool 11 and to the left of the slide bar 51. Preferably, the center 19c is arranged at a position of 30% to 70% of the distance from the cutting tool 11 to the center 51c of the first rod 51a (or the center 51d of the second rod 51b) in the rightward direction perpendicular to the surface of the cutting tool 11 starting from the cutting tool 11, for example, at a position of 42% of this distance. The distance from the first virtual plane S1 to the center 19c is, for example, 48 mm. When the distance from the first virtual plane S1 to the second virtual plane S2 is 115 mm, 48 mm / 115 mm = 42%.

[0083] As Figure 4 , Figure 5 shown, the cutting machine main body 10 has a motor housing 20 at a position to the right of the fixed cover 12 and the movable cover 13 and to the left of the slide bar 51. The motor housing 20 has a substantially cylindrical shape extending in the front-rear direction. The motor housing 20 houses an electric motor 21. The vertical position of the electric motor 21 is a position that overlaps with the second rod 51b when viewed from the side in a state where the cutting machine main body 10 is at the bottom dead center and the cutting tool 11 is vertical (see Figure 13 ). The electric motor 21 is housed such that the motor shaft 21a extends along the length direction of the substantially cylindrical motor housing 20.

[0084] As Figure 7 shown, the motor shaft 21a is parallel to the side surface of the cutting tool 11. When viewed from the extending direction of the cutting tool 11 and the radial direction of the motor shaft 21a, the angle formed by the motor shaft 21a with respect to the side surface of the cutting tool 11 is preferably -10° to 0° to 10° (the side of the motor shaft 21a opposite to the gear is negative when inclined to the left with respect to the angle (0°) parallel to the cutting tool 11 and positive when inclined to the right). As long as it is within this angle range, only the mutual shaft angle of the meshing bevel gears needs to be changed, and there is no need for major design changes such as adding components.

[0085] As Figure 4 shown, when the cutter 11 is in the vertical state and the cutting machine main body 10 is at the top dead center, the motor shaft 21a is preferably inclined within a range of -10° to 0° to 10° with respect to the horizontal line (the side of the motor shaft 21a opposite to the gear is inclined downward with respect to the horizontal line (0°) as negative and upward as positive). In the present embodiment, the motor shaft 21a is parallel to the horizontal line when the cutting machine main body 10 is at the top dead center. At the top dead center, the entire motor shaft 21a is disposed at a position below the central axis of the first rod 51a of the slide bar 51 and above the central axis of the second rod 51b. In addition, the entire motor shaft 21a is disposed at a position below the lower end of the first rod 51a of the slide bar 51 and above the upper end of the second rod 51b. In this way, the motor shaft 21a at the top dead center can be compactly disposed in the vertical direction.

[0086] As Figure 13 shown, when the cutting machine main body 10 is at the bottom dead center, the side of the motor shaft 21a opposite to the gear is inclined upward as it faces the rear. The inclination angle is 40° with respect to the horizontal line. When the cutter 11 is in the vertical state and the cutting machine main body 10 is at the bottom dead center, the motor shaft 21a is inclined within a range of 30° to 60° with respect to the horizontal line, and more preferably within a range of 35° to 45°. In this way, the motor shaft 21a at the top dead center can also be compactly disposed in the vertical direction.

[0087] As Figure 6 shown, when the cutter 11 is in the vertical state and the cutting machine main body 10 is at the top dead center, the motor shaft 21a, which is the center of the electric motor 21, is located to the right of the cutter 11 and to the left of the slide bar 51. The motor shaft 21a is preferably disposed at a position of 30% to 50% of the distance from the cutter 11 to the center 51c of the first rod 51a (or the center 51d of the second rod 51b) in the right direction perpendicular to the surface of the cutter 11 starting from the cutter 11, for example, at a position of 39% of this distance. The distance from the first virtual plane S1 to the motor shaft 21a is, for example, 45 mm. When the distance from the first virtual plane S1 to the second virtual plane S2 is 115 mm, 45 mm / 115 mm = 39%.

[0088] As Figure 7As shown, the electric motor 21 uses a motor called a DC brushless motor. The motor shaft 21a is supported in a posture along the length direction of the motor housing 20 so as to be rotatable about the axis. The stator 21b of the electric motor 21 is supported on the inner peripheral surface of the motor housing 20 in a non-rotatable manner. The rotor 21c of the electric motor 21 is arranged on the inner peripheral side of the stator 21b. The rotor 21c is mounted on the motor shaft 21a and can rotate together with the motor shaft 21a. The rotation angle of the rotor 21c is detected by a sensor substrate 21d provided at the end of the gear opposite side on the inner peripheral surface of the motor housing 20.

[0089] As Figure 7 shown, in the extending direction of the motor shaft 21a, an air inlet 20a capable of sucking external gas is provided on the rear surface (end face opposite to the gear side) of the motor housing 20. In the extending direction of the motor shaft 21a, in front of the electric motor 21 (gear side), a fan 22 is mounted in a manner capable of rotating integrally with the motor shaft 21a. When the electric motor 21 is started to rotate the fan 22, cooling air is introduced into the motor housing 20 from the air inlet 20a. The introduced cooling air flows toward the fan 22 in front of the extending direction of the motor shaft 21a. The cooling air flowing along the axial direction to the fan 22 bends toward the radially outer side of the fan 22. Figure 1 shown, an exhaust port 20b capable of discharging the cooling air in the motor housing is provided on the right side portion of the motor housing 20 on the gear side in the motor axial direction. The cooling air is discharged from the exhaust port 20b located on the radially outer side of the fan 22. In this way, the electric motor 21 is cooled by the cooling air flowing inside the motor housing 20.

[0090] As Figure 7 shown, in the extending direction of the motor shaft 21a, a gearbox 25 is connected to the front portion of the motor housing 20. The gearbox 25 is also connected to the right side surface of the fixed cover 12. In the extending direction of the motor shaft 21a, a first opening 25a opening toward the end opposite to the gear side in the motor shaft direction is provided at the rear portion of the gearbox 25. A second opening 25b opening to the left is provided at the left side portion of the gearbox 25. The first opening 25a and the second opening 25b communicate with each other through the inside of the gearbox 25. The first opening 25a and the motor housing 20 are joined in a nested manner. The mounting portion and the hole portion 20c of the motor housing 20 are the same component, so they have high-precision coaxiality. The first opening 25a and the mounting portion of the motor housing 20 are circular with high-precision roundness. The second opening 25b and the fixed cover 12 are joined in a nested manner. The second opening 25b and the mounting portion of the fixed cover 12 are circular with high-precision roundness.

[0091] As Figure 7As shown, the gearbox 25 houses the intermediate shaft 26. The intermediate shaft 26 extends in a direction (left - right direction) perpendicular to the side surface of the cutting tool 11 and is supported on the gearbox 25 in a rotatable manner about the axis. A reduction gear 26b is formed as an integral component on the left side of the intermediate shaft 26. The driven bevel gear 26a is inserted into the right side of the intermediate shaft 26 in an interposed manner and can move axially. The driven bevel gear 26a and the intermediate shaft 26 are relatively stopped from rotating by a key 26c. And, on the right side of the driven bevel gear 26a, there are provided a steel washer 26d, a rubber ring 26e, and a steel washer 26f. A snap ring 26g is installed on the rubber ring 26e sandwiched between the washers 26d and 26f in a state of being crushed axially.

[0092] As Figure 7 shown, the front part in the extending direction of the motor shaft 21a penetrates through the first opening 25a and enters the gearbox 25. On the front part in the extending direction of the motor shaft 21a, a driving bevel gear 21e is integrally installed with the motor shaft 21a. The driving bevel gear 21e meshes with the driven bevel gear 26a. The rotational power of the motor shaft 21a is transmitted to the intermediate shaft 26 extending in a direction substantially perpendicular to the motor shaft 21a after being decelerated through the meshing of the driving bevel gear 21e and the driven bevel gear 26a.

[0093] As Figure 7 shown, a first bearing 28a and a second bearing 28b are press - fitted onto the motor shaft 21a. The inner ring of the first bearing 28a is press - fitted to the rear end in the extending direction of the motor shaft 21a, and the outer ring of the first bearing 28a is press - fitted to the hole portion 20c at the inner rear end of the motor housing 20. The inner ring of the second bearing 28b is press - fitted to the front part in the extending direction of the motor shaft 21a, and the outer ring of the second bearing 28b is press - fitted to the hole portion 25c of the gearbox 25. A rubber pin 34 is press - fitted between the second bearing 28b and the hole portion 25c. This rubber pin 34 buffers impacts and vibrations.

[0094] As Figure 7 shown, on the intermediate shaft 26, a third bearing 28c is press - fitted at the right end, and a fourth bearing 28d is press - fitted at the left end. The outer ring of the third bearing 28c is press - fitted to the hole portion 25d of the gearbox 25. A polyurethane washer 35 is provided on the right side in the axial direction of the third bearing 28c. The outer ring of the fourth bearing 28d is press - fitted to the hole portion 29a of the bearing housing 29 through a rubber ring 36 and a steel washer 37 which are integral components. The polyurethane washer 35 and the rubber ring 36 buffer impacts and vibrations. Since both the second bearing 28b and the third bearing 28c are positioned in the hole portions 25c and 25d provided in the gearbox 25, the positions of the motor shaft 21a and the intermediate shaft 26 can be set with high precision accordingly. And the driving bevel gear 21e and the driven bevel gear 26a can be meshed with high precision.

[0095] AsFigure 7 , Figure 8 As shown, a fifth bearing 28e is provided on the right side of the output shaft 27, and the outer ring of the fifth bearing 28e is press-fitted into the hole portion 12b of the fixed cover 12. A sixth bearing 28f is provided on the left side of the output shaft 27, and the outer ring of the sixth bearing 28f is press-fitted into the hole portion 29b of the bearing housing 29. The output shaft 27 is arranged below the intermediate shaft 26 in a posture parallel to the intermediate shaft 26. At the right end of the output shaft 27, a reduction gear 27a as another component is installed by press-fitting into the output shaft 27. The reduction gear 26b and the reduction gear 27a mesh with each other. The rotational power of the intermediate shaft 26 is decelerated and transmitted to the output shaft 27 through the meshing of the reduction gear 26b and the reduction gear 27a. The intermediate shaft 26 and the output shaft 27 are arranged on the power transmission path from the motor shaft 21a to the tool 11 and are equivalent to the power transmission shafts of the present invention. In this way, the rotational power of the motor shaft 21a is decelerated and transmitted to the output shaft 27, thereby rotating the tool 11.

[0096] As Figure 1 , Figure 9 shown, a rectangular box-shaped controller housing 30 is connected to the rear of the motor housing 20. A controller 31 is provided in the controller housing 30. The controller 31 has a shallow, generally rectangular parallelepiped box body and a control substrate that is housed in the box body and is resin-molded. The controller 31 is housed in the controller housing 30 in a posture where the length direction is the same as the up-and-down direction and the thickness direction (the direction in which the shortest side of the box body extends) is the same as the front-and-rear direction. The controller 31 mainly houses a control circuit, a drive circuit, an automatic stop circuit, etc. for controlling the operation of the electric motor 21, which is a brushless motor. The control circuit has a microcomputer that sends a control signal to the electric motor 21 based on the position information of the rotor of the electric motor 21. The drive circuit has an FET that switches the current of the electric motor 21 based on the control signal received from the control circuit. The automatic stop circuit cuts off the power supply to the electric motor 21 according to the detection result of the state of the battery 33 so that it does not become an over-discharge or over-current state.

[0097] As Figure 1 , Figure 9 shown, air inlets 30a for introducing external air are provided on the left and right side portions of the controller housing 30. The inside of the controller housing 30 communicates with the inside of the motor housing 20 via a communication port 30b. The communication port 30b is arranged in front of the air inlets 30a and the controller 31 and in front of the air inlet 20a in the extending direction of the motor shaft 21a. When the electric motor 21 is started and the fan 22 (refer to Figure 7 ) rotates, a negative pressure is generated around the communication port 30b by the cooling air flowing inside the motor housing 20. Accordingly, as Figure 9As shown by the hollow arrow, cooling air that flows in from the air inlet 30a and heads toward the communication port 30b also flows inside the controller housing 30. In this way, the controller 31 is cooled by the cooling air generated by the rotation of the fan 22.

[0098] As Figure 4 , Figure 5 shown, a battery mounting portion 32 is provided at the rear of the controller housing 30 at top dead center. The mounting surface of the battery mounting portion 32 faces rearward and extends substantially perpendicular to the longitudinal direction of the motor housing 20. On the battery mounting portion 32, a substantially rectangular box-shaped battery 33 can be slidably mounted from above downward. In addition, the battery 33 that can be removed from the battery mounting portion 32 by sliding from below upward is, for example, a lithium-ion battery with an output voltage of 36V. The battery 33 can be removed from the battery mounting portion 32 and repeatedly charged using a separately prepared charger. The battery 33 can be flexibly used as a power source among other rechargeable power tools such as a screw tightening machine or an electric drill.

[0099] As Figure 1 , Figure 6 shown, the cutting machine main body 10 has a handle portion 40 at a position to the right of the side surface of the cutter 11 and to the left of the slide bar 51 in a state where the cutter 11 is vertical. The center plane in the left-right direction of the operation handle 41 and the center plane in the left-right direction of the battery mounting portion 32 are in the same plane. In addition, the motor shaft 21a and the center plane in the left-right direction of the operation handle 41 are in the same plane. An annular operation handle 41 extending along the side surface of the cutter 11 is provided at the front of the handle portion 40. A switch operation lever 42 is provided on the inner peripheral side of the operation handle 41. The switch operation lever 42 can be hooked and depressed with a finger while the user holds the operation handle 41. When the switch operation lever 42 is depressed, the electric motor 21 is started to rotate the cutter 11. A lock button 43 is provided at the upper part of the operation handle 41. By pressing the lock button 43, the operation of the switch operation lever 42 can be depressed. Accordingly, accidental start of the electric motor 21 is avoided.

[0100] As Figure 6As shown, when the cutter 11 is in a vertical state and the cutting machine main body 10 is at the top dead center, the center 41a in the left-right direction of the operation handle 41 is located to the right of the first virtual plane S1. In addition, when the cutter 11 is in a vertical state and the cutting machine main body 10 is at the top dead center, the center 41a is located to the left of the slide bar 51. Preferably, the center 41a is arranged at a position of 30% to 70% of the distance from the first virtual plane S1 to the center 51c of the first rod 51a (or the center 51d of the second rod 51b) in the face vertical direction to the right of the first virtual plane S1 starting from the first virtual plane S1. For example, it is arranged at a position of 39% of this distance. The distance from the first virtual plane S1 to the center 41a is, for example, 45 mm. When the distance from the first virtual plane S1 to the second virtual plane S2 is 115 mm, 45 mm / 115 mm = 39%.

[0101] As Figure 1 shown, switches 45 and 46 are provided on the right side portion of the handle portion 40. By pressing the switch 45, it is possible to switch the on / off of the laser of the laser irradiator 47 for ink line alignment (refer to Figure 9 ). The laser is irradiated onto the cutting surface to form a mark for aligning the cutter 11 with the ink line. By pressing the switch 46, it is possible to switch the on / off of the irradiation light of the lighting fixture 48 provided above the cutting machine main body 10. The lighting fixture 48 is supported by an arm 48a extending from the upper portion of the handle portion 40. The irradiation light of the lighting fixture 48 illuminates the periphery of the cutting area of the cutter 11.

[0102] As Figure 1 shown, for the handle portion 40, a communication adapter 49 can be inserted and installed behind the operation handle 41. The communication adapter 49 can perform wireless communication with other supporting devices. It is possible to link the start-up operation and stop operation of the cutting machine 1 with the start-up operation and stop operation of the supporting devices through wireless communication. Through the communication adapter 49, for example, it is possible to link a dust collector separately provided from the cutting machine 1 with the cutting machine 1.

[0103] As Figure 2 、 Figure 14 、 Figure 15As shown, the handle portion 40 has a carrying handle 44 behind the operating handle 41. The carrying handle 44 has a first connecting portion 44a at one end and a second connecting portion 44b at the other end. The first connecting portion 44a is connected to the left side portion of the fixed cover 12 and is disposed at a position rearward of the movable area of the movable cover 13. The second connecting portion 44b is connected to the left side portion of the controller housing 30. The carrying handle 44 extends forward from the first connecting portion 44a toward the left side of the movable area of the movable cover 13. Further, the carrying handle 44 extends above the movable area of the movable cover 13 and extends toward the right side as it goes rearward and is connected to the second connecting portion 44b. The carrying handle 44 cooperates with the fixed cover 12, the motor housing 20, and the controller housing 30 to form a loop. The carrying handle 44 extends in a substantially horizontal direction with its longitudinal direction substantially coinciding with the front-rear direction in a state where the cutting machine main body 10 is moved to the bottom dead center.

[0104] As Figure 5 , Figure 15 shown, a bottom dead center locking pin 38 is provided on the left side surface of the front portion of the sliding base 17. The bottom dead center locking pin 38 is composed of a pin extending left and right and an operating portion provided at the left end portion of the pin. A through hole extending in the left-right direction is provided in the sliding base 17. The pin of the bottom dead center locking pin 38 is inserted into the through hole and can move left and right. A recess is provided on the left side surface of the fixed cover 12 on the extension line of the bottom dead center locking pin 38 in a state where the cutting machine main body 10 is moved to the bottom dead center. By moving the bottom dead center locking pin 38 to the right at the bottom dead center, the bottom dead center locking pin 38 can be engaged with the recess of the fixed cover 12. By engaging the bottom dead center locking pin 38 with the recess, the cutting machine main body 10 can be locked at the bottom dead center. In a state where the cutting machine main body 10 is locked at the bottom dead center, the user can carry the cutting machine 1 by gripping the carrying handle 44.

[0105] As Figure 1 , Figure 10As shown, a rotary table fixing mechanism 60 is provided at the lower part of the workbench extension 5. A grip part 61 is provided at the front part of the workbench extension 5. The grip part 61 has a concavo-convex shape at the peripheral part so that the user can easily hold and rotate it. The user can hold the grip part 61 and rotate the rotary table 4 relative to the base 2 in the horizontal direction. A fixing rod 62 extends from the grip part 61 toward the inner rear of the workbench extension 5. The fixing rod 62 is supported inside the workbench extension 5 by screw engagement. The grip part 61 can rotate about the fixing rod 62 extending in the front-rear direction as the axis center. When the grip part 61 is rotated around the axis of the fixing rod 62, the fixing rod 62 is displaced in the front-rear direction. By displacing the fixing rod 62 backward so that the rear end engages with the base 2, the rotary table 4 can be positioned relative to the base 2 at an arbitrary miter angle. By displacing the fixing rod 62 forward, the positioning of the rotary table 4 at an arbitrary miter angle can be released.

[0106] As Figure 10 shown, the base 2 has a horizontal plate part 2b extending in the horizontal direction. The horizontal plate part 2b extends toward the rotary support shaft 2a at approximately the same height as the miter dial 7. A clamping member 63 is provided behind the fixing rod 62. The clamping member 63 has a substantially L-shaped configuration when viewed from the left-right direction. The clamping member 63 has a rotary shaft 63a extending in the left-right direction near the bent part of the substantially L-shaped configuration. The clamping member 63 is rotatably supported by the workbench extension 5 about the rotary shaft 63a. One end of the L-shaped configuration of the clamping member 63 can abut against the rear end of the fixing rod 62. The clamping member 63 has a clamping part 63b at the other end of the L-shaped configuration that can abut against the lower surface of the horizontal plate part 2b.

[0107] When Figure 10 the fixing rod 62 shown is displaced backward and abuts against the clamping member 63, the clamping member 63 rotates about the rotary shaft 63a. Accordingly, the clamping part 63b is displaced upward and abuts against the lower surface of the horizontal plate part 2b, thereby clamping the horizontal plate part 2b between the clamping part 63b and the workbench extension 5. Accordingly, the workbench extension 5 and the clamping member 63 cannot move relative to the horizontal plate part 2b in the left-right direction. Thus, the rotation of the workbench extension 5 and the rotary table 4 relative to the base 2 is locked. If the fixing rod 62 is displaced forward, the force pushing the clamping member 63 backward becomes smaller (or disappears). At this time, the clamping member 63 rotates about the rotary shaft 63a, causing the clamping part 63b to be displaced downward. By the downward displacement of the clamping part 63b, the clamping of the horizontal plate part 2b by the clamping member 63 and the workbench extension 5 is released.

[0108] As Figure 2 、 Figure 3As shown, a forward locking mechanism 65 is provided at the lower part of the workbench extension 5. By using the forward locking mechanism 65, the rotary workbench 4 can be positioned at a specified miter angle corresponding to the positioning recess 7b of the miter dial 7. The forward locking mechanism 65 has an unlocking operation handle 66 and a positioning pin 66a. The unlocking operation handle 66 is provided at the left side of the front part of the workbench extension 5. The positioning pin 66a extends in the front-rear direction along the length direction of the workbench extension 5 at the lower part of the workbench extension 5. The positioning pin 66a is provided at approximately the same height as the miter scale plate 7. The rear end of the positioning pin 66a can enter the positioning recess 7b by moving backward. In addition, the engagement between the rear end of the positioning pin 66a and the positioning recess 7b can be released by moving forward.

[0109] Figure 3 , Figure 10 The front part of the positioning pin 66a shown is connected to the unlocking operation handle 66. A locking pin 66b that extends perpendicular to the extending direction of the positioning pin 66a is provided at approximately the center in the front-rear direction of the positioning pin 66a. The locking pin 66b abuts against a pin support portion 67, and the pin support portion 67 is integrally provided with the workbench extension 5. An unillustrated guiding surface that spirally extends in the front-rear direction is provided inside the pin support portion 67. The locking pin 66b abuts against the guiding surface, and the displacement backward is restricted. The positioning pin 66a is urged backward by a compression spring 66c.

[0110] When the Figure 3 , Figure 10 shown unlocking operation handle 66 is pushed downward, the positioning pin 66a rotates about the axis, and the locking pin 66b moves forward along the guiding surface inside the pin support portion 67. Therefore, the positioning pin 66a moves forward against the acting force of the compression spring 66c. The engagement between the rear end of the positioning pin 66a that has moved forward and the positioning recess 7b is released. Therefore, when the positioning of the rotary workbench 4 is released by the operation of the grip portion 61, the rotary workbench 4 can rotate freely in the left-right direction. When the unlocking operation handle 66 is pulled upward, the positioning pin 66a rotates about the axis, causing the locking pin 66b to move backward along the guiding surface inside the pin support portion 67. The positioning pin 66a moves backward by the acting force of the compression spring 66c. The rear end of the positioning pin 66a abuts against the outer peripheral edge of the miter dial 7. When the rotary workbench 4 is rotated horizontally while holding the grip portion 61, the positioning pin 66a enters any one of the positioning recesses 7b provided on the outer peripheral edge of the miter dial 7. In this way, the rotary workbench 4 is positioned at a position of a specified miter angle corresponding to the positioning recess 7b.

[0111] As Figure 11As shown in the figure, a tilting fixing mechanism 70 is provided at the front part of the workbench extension 5. The tilting fixing mechanism 70 holds the main body support arm 50 in a position where it can tilt in the left-right direction. The tilting fixing mechanism 70 has a tilting fixing operation part 71 and a transmission shaft 73. The tilting fixing operation part 71 is provided between the grip part 61 and the front end of the workbench extension 5. The tilting fixing operation part 71 can rotate around an axis extending in the front-rear direction. The tilting fixing operation part 71 has a concavo-convex shape with a pattern different from that of the grip part 61 on the peripheral part, so that the user can easily hold and rotate it. Therefore, when the user holds it, the tilting fixing operation part 71 and the grip part 61 can be easily distinguished, thus preventing misoperation.

[0112] As Figure 11 shown in the figure, the transmission shaft 73 extends in the front-rear direction along the length direction of the workbench extension 5. The transmission shaft 73 extends to the lower part of the main body support arm 50. The front part of the transmission shaft 73 is connected through the tilting fixing operation part 71 and the reduction gear part 72. The rotational power of the tilting fixing operation part 71 is reduced by the reduction gear part 72 to rotate the transmission shaft 73 around the axis. A thrust needle bearing 74 and a receiving part 75 are installed at the rear part of the transmission shaft 73. The receiving part 75 is fixed to the transmission shaft 73 in front of the thrust needle bearing 74. A nut 76 is installed at the rear end of the transmission shaft 73. The nut 76 restricts the transmission shaft 73 from rotating around the axis relative to the main body support arm 50. The thrust needle bearing 74, the receiving part 75 and the nut 76 are in a state of clamping the arm support part 4b and the main body support arm 50 in the front-rear direction.

[0113] By making Figure 11 the transmission shaft 73 shown in the figure rotate around the axis, the rear end of the transmission shaft 73 is fastened to the nut 76. Accordingly, the main body support arm 50 and the arm support part 4b are pushed against each other in the front-rear direction by the axial force generated between the thrust needle bearing 74 and the receiving part 75 and the nut 76. In this way, the main body support arm 50 is positioned at a specified left-right tilting angle relative to the arm support part 4b. If the transmission shaft 73 is rotated in the reverse direction, the fastening between the nut 76 and the transmission shaft 73 becomes loose. Accordingly, the axial force between the thrust needle bearing 74 and the receiving part 75 and the nut 76 is released. Therefore, the main body support arm 50 can tilt left and right around the axis of the left-right tilting support shaft 50a (refer to Figure 10 ).

[0114] As Figure 16 shown in the figure, when the cutting machine main body 10 tilts to the left, there are no protruding parts around the lower side part of the cutter 11 and to the left of the cutter 11 (the movable cover 13 is located around the lower side of the cutter 11 in the figure, but actually moves upward). Therefore, the cutting machine main body 10 other than the cutter 11 will not touch the workpiece to be cut, and bevel cutting can be appropriately performed.

[0115] AsFigure 17 , Figure 18 As shown in Figure 18 , when the cutting machine main body 10 is tilted to the right, the motor housing 20, the gearbox 25, the controller housing 30, the handle portion 40, the slide bar 51, etc. are located above the positioning baffle 6. In other words, when the cutting machine main body 10 is tilted to the right, there are no protruding portions around the lower side portion of the cutter 11 and to the right of the cutter 11. Therefore, the cutting machine main body 10 other than the cutter 11 will not touch the workpiece to be cut, and bevel cutting can be appropriately performed.

[0116] As described above, as Figure 5 and Figure 6 shown, the cutting machine 1 has: a long slide bar 51 extending in the front-rear direction; a sliding base 17 mounted on the slide bar 51 and capable of moving along the slide bar 51; and a cutting machine main body 10 mounted on the sliding base 17 so as to be movable in the up-down direction. The cutting machine main body 10 has: an output shaft 27 extending in an axial direction orthogonal to the slide bar 51 and for mounting the cutter 11; an electric motor 21 that rotates the output shaft 27 and is located between the cutter 11 and the slide bar 51 when viewed from the front in a state where the cutter 11 is vertical.

[0117] Therefore, the slide bar 51 and the electric motor 21 are arranged on the right side surface side with respect to the cutter 11. Therefore, the cutting machine 1 can be provided without a structure protruding toward the left side surface side with respect to the cutter 11. Accordingly, the visibility of the cutting position of the cutter 11 on the left side surface side with respect to the cutter 11 can be made good.

[0118] As Figure 7 shown, the electric motor 21 has a motor shaft 21a. When viewed from the radial direction of the motor shaft 21a in a state where the cutter 11 is vertical, the motor shaft 21a is parallel to the side surface of the cutter 11 or inclined by 10° or less with respect to the side surface. Therefore, the motor shaft 21a can be arranged in a posture along the side surface of the cutter 11. Therefore, the electric motor 21 can be arranged close to the cutter 11. Accordingly, the cutter 11 and the electric motor 21 are arranged compactly in the left-right direction. In this way, the cutting machine main body 10 can be arranged compactly in the left-right direction.

[0119] As Figure 6 shown, the center of the electric motor 21 is arranged at a position of 30% to 50% of the distance from the cutter 11 to the slide bar 51 in the direction perpendicular to the surface of the cutter 11 starting from the cutter 11. Therefore, the center of the electric motor 21 is set at a position closer to the cutter 11 than the slide bar 51. Therefore, the center of gravity of the cutting machine main body 10 in the left-right direction can be made close to the cutter 11. Accordingly, when the cutting machine main body 10 is moved downward to cut the workpiece with the cutter 11, the torque generated by the reaction force from the workpiece received by the cutter 11 and the self-weight of the cutting machine main body 10 can be reduced.

[0120] As Figure 13 , Figure 15 , Figure 19 shown, the slide bar 51 has a plurality of rods 51a, 51b arranged side by side in the vertical direction. Specifically, the central axes of the first rod 51a and the second rod 51b are located in the same plane. The plane in which the first rod 51a and the second rod 51b extend is a vertical plane. The diameter of the second rod 51b is thicker than the diameter of the first rod 51a. The distance from the lower end of the first rod 51a to the upper end of the second rod 51b is larger than the diameter of the second rod 51b. At least one second rod 51b among the plurality of rods 51a, 51b is located at a position where, when the cutting machine main body 10 is at the bottom dead center and viewed axially, the second rod 51b overlaps with the electric motor 21. The fan 22 and the exhaust port 20b are located at positions lower than the upper end of the second rod 51b. Also, the fan 22 and the exhaust port 20b are located at positions lower than the lower end of the second rod 51b. The switch operation handle 42 is located at a position lower than the lower end of the first rod 51a. The gripped portion of the handle 44 is located at a position higher than the upper end of the first rod 51a. Therefore, when the cutting machine main body 10 is at the bottom dead center, the electric motor 21 can be arranged at a lower position. Accordingly, the protruding amount of the electric motor 21 upward is suppressed. Thereby, the cutting machine 1 becomes compact. In addition, when the cutting machine main body 10 is tilted left and right to cut the workpiece to be cut, it is possible to prevent the upper part of the electric motor 21 from obstructing the visibility of the cutting position.

[0121] As Figure 13 shown, the second rod 51b is located at the lowest position among the plurality of rods 51a, 51b. Therefore, the electric motor 21 can be arranged near the lowest point where the electric motor 21 can be arranged. Therefore, the protruding amount of the electric motor 21 upward can be suppressed to the minimum. Accordingly, the cutting machine 1 can be appropriately compactly arranged.

[0122] As Figure 13 shown, the plurality of rods include the first rod 51a located at the uppermost position and the second rod 51b located at the lowermost position. When the diameter 51e of the first rod 51a is set to a [mm], the diameter 51f of the second rod 51b is set to b [mm], the center distance 51g between the first rod 51a and the second rod 51b is set to c [mm], and the diameter of the tool 11 is set to d [mm], the relationship of (a / 2 + b / 2 + c) × 2 < d < (a / 2 + b / 2 + c) × 3.5 is satisfied. Therefore, the plurality of rods 51a, 51b can be compactly accommodated in the vertical direction within a length shorter than half of the diameter of the tool 11. Moreover, the vertical distance including all of the plurality of rods 51a, 51b is greater than 2 / 7 times the diameter of the tool 11. Therefore, the plurality of rods 51a, 51b can be arranged so as to have sufficient strength to support the cutting machine main body 10. In this way, both the compactification of the sliding structure of the cutting machine main body 10 and the supporting strength can be achieved.

[0123] As Figure 13 shown, when the workpiece is being cut by the cutting tool 11, the cutting machine main body 10 slides relative to the slide bar 51 in the traveling direction. The electric motor 21 has a motor shaft 21a. The motor shaft 21a is oriented at an inclined angle such that, when the cutting machine main body 10 is at the bottom dead center, the motor shaft 21a is inclined upward as it faces the traveling direction. The downward protrusion amount of the electric motor 21 can be suppressed to a minimum when the cutting machine main body 10 is at the bottom dead center. Accordingly, the cutting machine 1 can be compactly arranged in the vertical direction.

[0124] As Figure 13 shown, the inclined angle of the motor shaft 21a is 30° to 60° with respect to the horizontal line when the cutting machine main body 10 is at the bottom dead center. Therefore, it is possible to prevent the motor housing 20 accommodating the electric motor 21 from coming into contact with the workpiece. Therefore, the cutting machine 1 arranged compactly can be used to appropriately cut the workpiece.

[0125] As Figure 4 shown, the motor shaft 21a is parallel to the horizontal line or has an inclined angle of 10° or less with respect to the horizontal line when the cutting machine main body 10 is at the top dead center. Therefore, the upward or downward protrusion amount of the electric motor 21 can be suppressed. Accordingly, it is possible to prevent the visibility from being obstructed when confirming the cutting position of the cutting tool 11.

[0126] As Figure 5 、 Figure 6 shown, the cutting machine 1 has an operation handle 41 that is used when moving the cutting machine main body 10 relative to the slide bar 51. When the cutting tool 11 is in a vertical state, when viewed from the front, the center 41a of the operation handle 41 is located on the first virtual plane S1 including the cutting tool 11 or between the slide bar 51 and the cutting tool 11. Also, the center plane of the operation handle 41 in the left - right direction and the center plane of the battery mounting portion 32 in the left - right direction are the same plane. The motor shaft 21a (refer to Figure 4 ) is located on the same plane as the center plane of the operation handle 41 in the left - right direction.

[0127] Therefore, the slide bar 51 and the center 41a of the operating handle 41 can be brought closer in the left-right direction. Therefore, when the user holds the operating handle 41 to make the tool 11 cut into the workpiece, the torque of the cutting machine body 10 relative to the slide bar 51 can be reduced. Moreover, the tool 11 and the center 41a of the operating handle 41 can be brought closer in the left-right direction. Therefore, when the user holds the operating handle 41 to make the tool 11 cut into the workpiece, the torque generated by the reaction force from the workpiece and the operating force of the operating handle 41 can be reduced. In addition, it is preferred that the distance from the center of the operating handle 41 (battery mounting portion 32, motor shaft 21a) to the tool 11 in the direction perpendicular to the surface of the tool 11 is shorter than the distance to the center 51c of the first rod 51a (or the center 51d of the second rod 51b) as the starting point.

[0128] like Figure 6 As shown in FIG. 1 , the center 41a of the operating handle 41 is arranged at a position of 30% to 70% of the distance from the cutter 11 to the slide bar 51 in the direction perpendicular to the surface of the cutter 11, with the cutter 11 as the starting point. Therefore, the center 41a of the operating handle 41 is arranged at a position not too far away from both the cutter 11 and the slide bar 51. Therefore, the torque of the cutting machine body 10 acting between the cutter 11 and the operating handle 41 can be reduced. In addition, the deflection of the slide bar 51 caused by the operating force of operating the operating handle 41 can be suppressed.

[0129] like Figure 1 , Figure 6 As shown in FIG. 1 , the cutter 1 has a bottom stopper 19 that restricts the cutter body 10 from moving to a position below the bottom stopper. When the cutter 11 is in a vertical state, the center 19c of the bottom stopper 19 is located between the slide bar 51 and the cutter 11 when viewed from the front. Therefore, the distance between the center 19c of the bottom stopper 19 and the slide bar 51 can be shortened. When the cutter body 10 descends to the bottom stopper, the bottom stopper 19 receives a reaction force. Therefore, by shortening the distance, the torque of the cutter body 10 relative to the slide bar 51 caused by the reaction force can be reduced.

[0130] like Figure 6 As shown in FIG. 1 , the center 19c of the bottom stopper 19 is arranged at a position of 30% to 70% of the distance from the cutter 11 to the slide bar 51 in the direction perpendicular to the surface of the cutter 11, with the cutter 11 as the starting point. Therefore, the center 19c of the bottom stopper 19 is arranged at a position that is not too far away from both the cutter 11 and the slide bar 51. Therefore, the torque of the cutting machine body 10 acting between the reaction force received by the bottom stopper 19 and the slide bar 51 can be reduced, and the shaking of the cutter 11 caused by the torque can be suppressed.

[0131] like Figure 2 ,Figure 5 , Figure 6 As shown in Figure 6 , the cutting machine 1 has an operation handle 41 which is used when moving the cutting machine main body 10 relative to the slide bar 51. The cutting machine 1 has a movable cover 13 which covers a part of the cutter 11 and can move relative to the cutting machine main body 10. The cutting machine 1 has a carrying handle 44 which is used when carrying the cutting machine 1 and has a structure different from that of the operation handle 41. The carrying handle 44 extends across the movable area of the movable cover 13. Therefore, the carrying handle 44 can be compactly arranged without obstructing the visibility of the cutting position, and the carrying handle 44 can be arranged without obstructing the movement of the movable cover 13.

[0132] As Figure 7 , Figure 8 As shown in Figure 8 , the cutting machine 1 has an intermediate shaft 26 and an output shaft 27 which extend orthogonally to the motor shaft 21a of the electric motor 21 and are arranged on the power transmission path from the motor shaft 21a to the cutter 11. The cutting machine 1 has gears (drive side bevel gear 21e, driven side bevel gear 26a, reduction gears 26b, 27a) mounted on the motor shaft 21a or the intermediate shaft 26 or the output shaft 27 and a gear box 25 for housing the gears. The gear box 25 has: a first opening 25a through which the motor shaft 21a passes; and a second opening 25b which opens in a direction crossing the opening direction of the first opening 25a and through which the intermediate shaft 26 passes. The gear box 25 is formed of one component. Therefore, the gear box 25 houses at least a part of the motor shaft 21a, at least a part of the intermediate shaft 26 and the gears extending in mutually different directions, and is compactly formed. Accordingly, the cutting machine main body 10 can be compactly arranged in the left-right direction and the front-rear direction. In addition, by being formed of one component, the strength of the gear box 25 can be improved.

[0133] As Figure 7 , 8 As shown in 8 , the gear box 25 supports a set of gears connecting the motor shaft 21a and the intermediate shaft 26, and the set of gears is the drive side bevel gear 21e and the driven side bevel gear 26a. Therefore, power can be transmitted from the motor shaft 21a extending in the front-rear direction to the intermediate shaft 26 extending in the left-right direction through a set of the drive side bevel gear 21e and the driven side bevel gear 26a. Therefore, the gear box 25 for supporting a set of the drive side bevel gear 21e and the driven side bevel gear 26a can be compactly formed in the left-right direction and the front-rear direction.

[0134] As Figure 13As shown, the cutting machine 1 has a controller 31 that controls the output of the electric motor 21. The controller 31 is located above the electric motor 21 when the cutting machine main body 10 is at the bottom dead center. Therefore, the controller 31 can be arranged in such a way that the cutting machine main body 10 is compactly arranged in the left-right direction. And the amount of protrusion of the controller 31 downward can be suppressed. Therefore, when the cutting machine main body 10 is at the bottom dead center, it is possible to prevent the controller housing 30 housing the controller 31 from coming into contact with the workpiece to be cut.

[0135] As Figure 13 shown, the cutting machine 1 has a controller 31 that controls the output of the electric motor 21. The controller 31 overlaps the electric motor 21 in the left-right direction when the cutting machine main body 10 is at the bottom dead center. Therefore, the controller 31 and the electric motor 21 can be compactly arranged in the left-right direction.

[0136] As Figure 7 、 9 shown, the cutting machine 1 has: a fan 22 that rotates through the electric motor 21 to generate wind for cooling the electric motor 21; and a controller 31 that controls the output of the electric motor 21. The controller 31 is cooled by the wind generated by the fan 22. Therefore, both the electric motor 21 and the controller 31 can be efficiently cooled by the fan 22.

[0137] Based on Figures 21 to 23 the cutting machine (bench cutting machine) 80 according to the second embodiment of the present invention will be described. Instead of Figure 1 the controller housing 30 of the cutting machine 1 of the first embodiment shown, the cutting machine 80 has a rectangular box-shaped controller housing 81 with the left-right direction as the length direction. In the following description, only the structures different from the first embodiment will be described in detail. In addition, Figures 21 to 23 the handle 44 is omitted.

[0138] In Figure 21 、 22 the controller housing 81 shown, a controller 82 provided in the same manner as the controller 31 (refer to Figure 10 ) is housed. The controller 82 is housed in the controller housing 81 in a posture where the length direction of the shallow substantially rectangular parallelepiped box body coincides with the left-right direction and the thickness direction (the direction in which the shortest side of the box body extends) coincides with the front-back direction. The controller housing 81 is connected to the motor housing 20 in the front-back direction via a rectangular column-shaped bridging portion 83 extending in the front-back direction. The inside of the bridging portion 83 is provided to be hollow to communicate the controller housing 81 and the motor housing 20. An air inlet (not shown) is provided on the side surface of the controller housing 81. When the electric motor 21 is started to rotate the fan 22 (refer to Figure 7)When rotating, the cooling air flowing inside the motor housing 20 will generate a negative pressure at the communicating part between the bridging part 83 and the motor housing 20. Accordingly, the cooling air flows from the air inlet of the controller housing 81 toward the inside of the controller housing 81 and the inside of the bridging part 83. In this way, the controller 82 housed in the controller housing 81 is cooled.

[0139] As Figure 21 , 22 shown, a battery mounting part 84 is provided at the rear part of the controller housing 81. The mounting surface of the battery mounting part 84 faces rearward. On the battery mounting part 84, a substantially rectangular box-shaped battery 33 can be slidably mounted from the left side toward the right side (the side of the slide bar 51). In addition, by sliding the battery 33 from the right side toward the left side, it can be removed from the battery mounting part 84. As Figure 23 shown, the main body support arm 50 has a shape that slopes to the right as it goes upward in a state where the cutting tool 11 is vertical, so that when the cutting machine main body 10 is moved backward, the main body support arm 50 does not collide with the cutting machine main body 10 and the battery 33 mounted on the battery mounting part 84 (refer to Figure 21 ).

[0140] Based on Figures 24 to 28 the third embodiment of the cutting machine (bench-type cutting machine) 90 of the present invention will be described. Instead of the cutting machine main body 10 of the cutting machine 1 shown in Figure 1 , the cutting machine 90 has a cutting machine main body 91. In the following description, only the structures different from those of the first embodiment will be described in detail. In addition, the cutting machine main body 91 can swing up and down about the vertical swing shaft 91a, and the state at the lower dead center is shown in Figures 24 to 28 . In addition, the structures other than the cutting machine main body 91 are omitted.

[0141] As Figure 24 shown, the cutting machine main body 91 has a motor housing 92 for housing an electric motor 21. The motor housing 92 has a substantially cylindrical shape extending in the front-rear direction. The motor housing 92 is disposed at a position to the right of the fixed cover 12 and to the left of the slide bar 51. The vertical position of the electric motor 21 housed in the motor housing 92 is a position that overlaps with the second rod 51b when viewed from the side in a state where the cutting machine main body 10 is at the lower dead center and the cutting tool 11 (refer to Figure 13 ) is vertical. The electric motor 21 is housed in such a manner that the motor shaft 21a is along the length direction of the substantially cylindrical motor housing 20.

[0142] As Figure 27 , Figure 28As shown, an air inlet 92a capable of introducing external air is provided on the rear surface of the motor housing 92 in the extending direction of the motor shaft 21a. An extending portion 92b extending radially outward is provided at the lower front end of the motor housing 92. The extending portion 92b is formed in a cylindrical shape that is isolated from the accommodation space of the electric motor 21 and penetrates in the extending direction of the motor shaft 21a. The rear end opening of the cylindrical extending portion 92b is used as an exhaust port 92c of the motor housing 92. The exhaust port 92c is provided at a front-rear position substantially the same as the front end of the stator 21b on the radially outer side of the electric motor 21.

[0143] As Figure 27 shown, a gearbox 93 is connected to the front portion of the motor housing 92 in the extending direction of the motor shaft 21a. The gearbox 93 is also connected to the right side surface of the fixed cover 12. In the extending direction of the motor shaft 21a, a first opening 93a opening toward the side opposite to the gear in the motor shaft direction is provided at the rear portion of the gearbox 93. The first opening 93a is joined to the motor housing 92 in a nested manner.

[0144] The outer ring of the first bearing 28a that rotatably supports the rear end of the motor shaft 21a is press-fitted into a hole portion 92f recessed in the rear portion of the motor housing 92. The outer ring of the second bearing 28b that rotatably supports the front end of the motor shaft 21a is press-fitted into a hole portion 93b recessed in the gearbox 93. An inner peripheral front end surface 93e is provided on the inner peripheral side of the gearbox 93. The inner peripheral front end surface 93e is located in front of the fan 22 and extends substantially orthogonally to the motor shaft 21a.

[0145] As Figure 27 shown, an extending portion 93c extending radially outward is provided at the lower front end of the gearbox 93. A curved surface 93d smoothly connected to the radially outer end of the inner peripheral front end surface 93e is provided on the inner peripheral side of the extending portion 93c. The curved surface 93d curves in an arc shape toward the radially outer side of the gearbox 93 and extends rearward at the same time. The rear end of the curved surface 93d is smoothly connected to the inner peripheral surface of the extending portion 92b of the motor housing 92. Therefore, a ventilation path smoothly connected from the inner peripheral front end surface 93e to the exhaust port 92c is formed.

[0146] Refer to Figure 27, shows the flow of the cooling air for cooling the electric motor 21. When the fan 22 installed at the front of the motor shaft 21a rotates as shown by the black arrow in the figure, the cooling air is introduced into the motor housing 20 from the air inlet 92a. The cooling air in the motor housing 20 flows along the extension direction of the motor shaft 21a towards the front fan 22. The cooling air in the gearbox 93 bends towards the radially outer side of the fan 22 and flows along the inner peripheral front end face 93e towards the inner peripheral portion of the protruding portion 93c. The cooling air flows along the curved surface 93d and along the extension direction of the motor shaft 21a towards the rear exhaust port 92c. The exhaust air discharged from the exhaust port 92c is parallel to the wind direction of the cooling air in the motor housing 92 and is discharged in the direction opposite to the wind direction of the cooling air.

[0147] As Figure 28 shown, a plurality of ribs 92d extending in the vertical direction and separating the opening surface left and right are provided on the exhaust port 92c. Through the plurality of ribs 92d, the exhaust air discharged from the exhaust port 92c is rectified. Accordingly, the wind direction of the exhaust air is adjusted to be in the direction towards the rear along the extension direction of the motor shaft 21a.

[0148] As Figure 24 , Figure 27 shown, a protrusion 92g protruding radially outward is provided at the lower part of the motor housing 92. A circular fitting hole 92e penetrating in the left-right direction is provided in the protrusion 92g. A cylindrical fitting pin 91b extending in the left-right direction is provided on the right side surface of the fixing cover 12. The fitting pin 91b is set to be inserted into the fitting hole 92e with a clearance fit. The fitting pin 91b is provided at a position farther from the rotation center of the cutting tool 11 (refer to Figure 13 ) than the gearbox 93 screwed to the fixing cover 12. When assembling the motor housing 92 and the gearbox 93 to the fixing cover 12, the fitting pin 91b is inserted into the fitting hole 92e. Accordingly, the motor housing 92 is positioned relative to the fixing cover 12. By providing the fitting pin 91b at a position far from the rotation center of the cutting tool 11, rotation of the motor housing 92 relative to the fixing cover 12 in the vertical direction can be suppressed.

[0149] As Figure 25 , Figure 26As shown, a second lower dead center stopper 94 is provided on the left side of the rear part of the fixed cover 12. The second lower dead center stopper 94 has an external thread shape extending in the vertical direction and is an internal hexagonal bolt with its head on the upper side. A synthetic resin for preventing loosening is applied to the external thread portion of the second lower dead center stopper 94. The second lower dead center stopper 94 prevents the cutting machine main body 91 from moving to a position lower than the second lower dead center. The second lower dead center is set at a position higher than the lower dead center of the cutting machine main body 91 set by the lower dead center stopper 19. The second lower dead center is set such that the height of the lower end of the cutter 11 is the same as the height of the upper surface of the workbench 4a, or the height of the lower end of the cutter 11 is slightly lower than the height of the upper surface of the workbench 4a. Therefore, when moving down to the second lower dead center, the distance from the lower end of the outer flange 15 to the upper surface of the workbench 4a becomes longer. Accordingly, the cutting depth at which the cutter 11 can cut into the workpiece to be cut becomes longer, so that a workpiece with a large thickness can be cut using a spacer block. By rotating the second lower dead center stopper 94, the height of the second lower dead center can be adjusted. The adjustment of the height of the second lower dead center is mainly carried out during the production process of the product. Adjusting the height of the second lower dead center requires rotating the second lower dead center stopper 94 against the frictional force of the synthetic resin for preventing loosening. Therefore, since the torque is too large when operating by hand, a hexagonal wrench is used.

[0150] As Figure 25 , Figure 26 shown, on the left side of the rear part of the fixed cover 12, an unlocking operation handle 95 is provided adjacent to the second lower dead center stopper 94. The unlocking operation handle 95 is connected to the sliding base 17 so as to be swingable in the left - right direction with its rear end as the center. The unlocking operation handle 95 can swing around a swing support shaft 97 between an initial position and an unlocking position, where the initial position is the position where the unlocking operation handle 95 extends along the front - rear direction following the fixed cover 12; the unlocking position is the position where the front end of the unlocking operation handle 95 moves away from the fixed cover 12 to the left. A first concave portion into which the lower end of the second lower dead center stopper 94 can enter is provided on the upper surface of the unlocking operation handle 95. When the unlocking operation handle 95 is in the initial position, the lower end of the second lower dead center stopper 94 can enter the first concave portion from above. Therefore, when the unlocking operation handle 95 is in the initial position, the cutting machine main body 91 can descend to the lower dead center (refer to Figure 19 ) where the lower end of the second lower dead center stopper 94 enters the first concave portion and the lower dead center stopper 19 abuts against the lower dead center stopper abutting portion 17a. When the unlocking operation handle 95 is in the unlocking position, the lower end of the second lower dead center stopper 94 cannot enter the first concave portion of the unlocking operation handle 95 and abuts against the upper surface of the unlocking operation handle 95. Therefore, when the unlocking operation handle 95 is in the unlocking position, the lower dead center of the cutting machine main body 91 is at the second lower dead center, which is at a position higher than the lower dead center set by the lower dead center stopper 19.

[0151] AsFigure 25 , Figure 26 As shown in Figure 26 , a slot depth adjustment screw 96 is provided on the left side of the rear part of the fixed cover 12. The slot depth adjustment screw 96 is arranged in front of the second bottom dead center stopper 94. The slot depth adjustment screw 96 has an external thread shape extending in the vertical direction. The slot depth adjustment screw 96 is connected to the fixed cover 12 in a threaded structure so as to be movable in the vertical direction. By rotating the slot depth adjustment screw 96, the lower end of the slot depth adjustment screw 96 moves up and down relative to the height of the fixed cover 12. A second recess into which the lower end of the slot depth adjustment screw 96 can enter is provided on the upper surface of the release operating lever 95. When the release operating lever 95 is in the initial position, the lower end of the slot depth adjustment screw 96 can enter the second recess from above, and when the release operating lever 95 is in the release position, the lower end of the slot depth adjustment screw 96 cannot enter the second recess. Therefore, when the release operating lever 95 is in the initial position, the cutting machine main body 91 can be lowered to the bottom dead center (see Figure 19 ) where the lower end of the slot depth adjustment screw 96 enters the second recess and the bottom dead center stopper 19 abuts against the bottom dead center stopper abutting portion 17a. When the release operating lever 95 is in the release position, the bottom dead center of the cutting machine main body 91 is located at a position higher than the bottom dead center set by the bottom dead center stopper 19, and becomes a specified height (a position higher than the second bottom dead center) set by the slot depth adjustment screw 96 through the operation of the user. Knurling is formed, for example, on the head of the slot depth adjustment screw 96. In addition, a synthetic resin for preventing loosening is not applied, for example, to the external thread portion of the slot depth adjustment screw 96. Therefore, the slot depth adjustment screw 96 can be rotated by hand force for operation. A hexagonal hole is formed on the end face of the head of the slot depth adjustment screw 96. Therefore, it can also be rotated with an Allen wrench.

[0152] As described above, as Figure 27 shown, the cutting machine main body 91 has an exhaust port 92c, which is arranged at the same front-rear position as the electric motor 21 and opens rearward. The exhaust air after cooling the electric motor 21 is discharged from the exhaust port 92c. Therefore, it is possible to suppress the exhaust air from being discharged toward the user side in front of the cutting machine 90. Therefore, it is possible to suppress the chips from scattering toward the user. In addition, when the cutting machine main body 91 is tilted left and right for bevel cutting, it is possible to suppress the exhaust air from being discharged toward the workpiece to be cut below the electric motor 21. Therefore, it is possible to suppress the chips from being lifted on the workpiece to be cut.

[0153] As Figure 27 ​​As shown, the exhaust air discharged from the exhaust port 92c flows parallel to the cooling air that is cooling the electric motor 21 and in a direction opposite to that of the cooling air. Therefore, the intake port 92a is disposed behind the electric motor 21. Thus, it is possible to suppress chips floating near the intake port 92a from being sucked into the intake port 92a. Further, the exhaust air flows along the extending direction of the motor shaft 21a of the electric motor 21, parallel to the cooling air and in a direction opposite to that of the cooling air. Therefore, the exhaust air is discharged in such a manner that it does not separate from the electric motor housing 92 that houses the electric motor 21 in the vertical or horizontal direction. Accordingly, it is possible to further suppress the scattering of chips on the workpiece being cut.

[0154] Various modifications can be made to the cutting machine 1 of the embodiment described above. The cutting machine main body 10 is supported by a slide bar 51 that is movably mounted on the main body support arm 50 in the front-rear direction. The main body support arm 50 is supported by the arm support portion 4b of the rotary table 4 in a manner that can be tilted with respect to the arm support portion 4b of the rotary table 4. Alternatively, the main body support arm 50 can be configured to be directly supported on the base 2 or the mounting surface. It can also be applied to a table-type cutting machine that does not have a left-right tilt angle adjustment mechanism or a miter angle adjustment mechanism, where the left-right tilt angle adjustment mechanism can tilt in the left-right direction of the cutting machine main body 10; the miter angle adjustment mechanism enables the rotary table 4 to rotate horizontally with respect to the base 2.

[0155] The cutting machine main body 10 can also be configured in a manner opposite to the left-right configuration of the present invention. That is, it can be configured such that the cutter 11 is disposed on the right side, the slide bar 51 is disposed on the left side, and the electric motor 21, the battery mounting portion 32, the handle portion 40, etc. are disposed in the left-right direction between the cutter 11 and the slide bar 51.

[0156] Although the slide bar 51 including two rods 51a and 51b is illustrated, the rod can be one, or three or more rods arranged side by side. The slide bar 51 can be not parallel to the side surface of the cutter 11. The slide bar 51 can also be not parallel to the horizontal line.

[0157] The configuration of the controller 31 is not limited to the illustrated case. For example, it can also be disposed above the electric motor 21 in a posture where the length direction is along the motor shaft 21a and the thickness direction is in the radial direction of the electric motor 21.

[0158] In the cutting machine 90, a structure is illustrated in which the exhaust port 92c is provided on the radially outer side of the electric motor 21 and at a front-rear position substantially the same as the front end of the stator 21b. Alternatively, for example, the exhaust port 92c can be disposed at a position in front of the stator 21b of the electric motor 21. For example, it can be configured such that the exhaust port 92c of the cutting machine 90 is provided at the rear end of the protruding portion 93c of the gear box 93, and the protruding portion 92b is not provided on the motor housing 92.

Claims

1. A desktop cutting machine, characterized in that, it has a rotary table, a main body support arm, a first slide bar, a second slide bar, a sliding base and a cutting machine main body, wherein, the rotary table is configured to support the workpiece to be cut when cutting the workpiece to be cut, the main body support arm can rotate relative to the rotary table around a tilting support shaft, the first slide bar and the second slide bar extend from the main body support arm and are elongated, having a longitudinal axis spaced apart from and parallel to the tilting support shaft, and the longitudinal axes are respectively located in a second virtual plane, the sliding base is mounted on the first slide bar and the second slide bar and can slide along the first slide bar and the second slide bar; the cutting machine main body is mounted on the sliding base in a manner that can move up and down relative to the sliding base, the first slide bar and the second slide bar, the cutting machine main body has an output shaft, a cutting tool and an electric motor, wherein, the output shaft extends along an axial direction orthogonal to the second virtual plane; the cutting tool is mounted on the output shaft, the electric motor has a motor shaft, and when observing in the direction of the longitudinal axis of the first slide bar and the second slide bar in the state where the cutting tool is vertical, the whole of the motor shaft is located between the cutting tool and the first slide bar and the second slide bar, in the state where the cutting tool is vertical, the first slide bar is arranged above the second slide bar in the up and down direction, and the first slide bar, the second slide bar and the main body support arm can tilt relative to the rotary table around the tilting support shaft in order to change the bevel cutting angle of the cutting tool, the cutting tool and the electric motor as a whole are located on the same side of the second virtual plane.

2. The desktop cutting machine according to claim 1, characterized in that, in the state where the cutting tool is vertical, when observing from the radial direction of the motor shaft, the motor shaft extends parallel to the side surface of the cutting tool or is inclined by 10° or less with respect to the side surface.

3. The desktop cutting machine according to claim 1 or 2, characterized in that, the center of the electric motor is arranged at a position of 30% to 50% of the distance from the cutting tool to the first slide bar and the second slide bar in the direction perpendicular to the plane of the cutting tool starting from the cutting tool.

4. The desktop cutting machine according to claim 1 or 2, characterized in that, when the cutting machine main body rotates downward to the lower dead point, at least one of the first slide bar and the second slide bar is at least partially located at a position overlapping with the electric motor when observing from the axial direction of the output shaft.

5. The desktop cutting machine according to claim 4, characterized in that, when the diameter of the first slide bar is set as amm, the diameter of the second slide bar is set as bmm, the center distance between the first slide bar and the second slide bar is set as cmm, and the diameter of the cutting tool is set as dmm, the relationship of (a / 2 + b / 2 + c) × 2 < d < (a / 2 + b / 2 + c) × 3.5 is satisfied.

6. The desktop cutting machine according to claim 1 or 2, characterized in that, When cutting a workpiece to be cut using the cutting tool, the main body of the cutting machine slides along the traveling direction relative to the first slide bar and the second slide bar. When the main body of the cutting machine rotates downward to the lower dead center position, the motor shaft is oriented to have an inclination angle that slopes upward as it faces the traveling direction.

7. The bench-type cutting machine according to claim 6, wherein: The inclination angle of the motor shaft is 30° to 60° relative to the horizontal line.

8. The bench-type cutting machine according to claim 7, wherein: When the main body of the cutting machine is at the upper dead center, the motor shaft is parallel to the horizontal line or has an inclination angle of 10° or less relative to the horizontal line.

9. The bench-type cutting machine according to claim 1 or 2, wherein: It has an operation handle that is gripped when moving the main body of the cutting machine relative to the first slide bar and the second slide bar. In a state where the cutting tool is vertical, when viewed along the longitudinal axis directions of the first slide bar and the second slide bar, the center of the operation handle is located on a second virtual plane including the cutting tool or between the first slide bar and the second slide bar and the cutting tool.

10. The bench-type cutting machine according to claim 9, wherein: The center of the operation handle is arranged at a position that is 30% to 70% of the distance from the cutting tool to the first slide bar and the second slide bar in the direction perpendicular to the plane of the cutting tool starting from the cutting tool.

11. The bench-type cutting machine according to claim 1 or 2, wherein: It has a lower dead center stopper that is used to restrict the rotational movement of the main body of the cutting machine to a position lower than the lower dead center. In a state where the cutting tool is vertical, when viewed along the longitudinal axis directions of the first slide bar and the second slide bar, the center of the lower dead center stopper is located between the first slide bar and the second slide bar and the cutting tool.

12. The bench-type cutting machine according to claim 11, wherein: The center of the lower dead center stopper is arranged at a position that is 30% to 70% of the distance from the cutting tool to the first slide bar and the second slide bar in the direction perpendicular to the plane of the cutting tool starting from the cutting tool.

13. The bench-type cutting machine according to claim 1 or 2, wherein: It has an operation handle, a movable cover, and a carrying handle, wherein: The operation handle is gripped when moving the main body of the cutting machine relative to the first slide bar and the second slide bar. The movable cover covers a part of the cutting tool and is movable relative to the main body of the cutting machine. The carrying handle is gripped when carrying the bench-type cutting machine and is provided separately from the operation handle. The carrying handle extends across the movable area of the movable cover.

14. The bench-type cutting machine according to claim 1 or 2, wherein: It has a power transmission shaft, a gear, and a gearbox, wherein: The power transmission shaft extends in a direction intersecting the motor shaft of the electric motor and is arranged in the power transmission path from the motor shaft to the cutting tool. The gear is mounted on the motor shaft or the power transmission shaft. The gearbox houses the gear. The gearbox has a first opening and a second opening. Among them, the first opening is penetrated by the motor shaft; the second opening opens in a direction intersecting with the opening direction of the first opening and is penetrated by the power transmission shaft. The gearbox is composed of one component.

15. The bench-type cutting machine according to claim 14, wherein The gearbox supports a set of the gears, and the set of gears connects the motor shaft and the power transmission shaft. The set of gears are bevel gears.

16. The bench-type cutting machine according to claim 1 or 2, wherein The cutting machine main body has an exhaust port, which is arranged at the same front-rear position as the electric motor, or arranged at a position in front of the electric motor and opens rearward. The exhaust air after cooling the electric motor is discharged from the exhaust port.

17. The bench-type cutting machine according to claim 16, wherein The exhaust air discharged from the exhaust port is parallel to the cooling air cooling the electric motor and flows in a direction opposite to that of the cooling air.

18. The bench-type cutting machine according to claim 1 or 2, wherein It has a controller for controlling the output of the electric motor. When the cutting machine main body is at the bottom dead center, the controller is located above the electric motor.

19. The bench-type cutting machine according to claim 1 or 2, wherein It has a controller for controlling the output of the electric motor. When the cutting machine main body is at the bottom dead center, the controller overlaps with the electric motor in the left-right direction.

20. The bench-type cutting machine according to claim 1 or 2, wherein It has a fan and a controller. Among them, the fan rotates through the electric motor to generate wind for cooling the electric motor; the controller controls the output of the electric motor. The controller is cooled by the wind generated by the fan.

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