JP2022088317A - Tabletop cutting machine - Google Patents

Abstract

To provide a tabletop cutting machine with good visibility of a cutting position of a blade tool.SOLUTION: A cutting machine 1 of the invention comprises: a long slide bar 51 extending in the front-back direction; a slide base 17 mounted on the slide bar 51 and moving along the slide bar 51; and a cutting machine body 10 movably mounted on the slide base 17 in the vertical direction. The cutting machine body 10 comprises an output shaft 27 that extends in an axial direction orthogonal to the slide bar 51 and to which a blade tool 11 is attached, and an electric motor 21 that rotates the output shaft 27 and is positioned between the blade tool 11 and the slide bar 51 when viewed from the front in a state in which the blade tool 11 is vertical.SELECTED DRAWING: Figure 6

Description

The present invention relates to a tabletop cutting machine used for cutting a material to be cut such as wood.

This type of tabletop cutting machine has, for example, a long slide bar and a slide base that is attached to the slide bar and can be moved along the slide bar. The cutting machine body is attached to the slide base. The cutting machine main body has an electric motor and a cutting tool that rotates by using the electric motor as a power source. The cutting machine body is supported by the slide base so as to be movable in the vertical direction intersecting the extending direction of the slide bar. By moving the cutting machine body toward the material to be cut placed below, the cutting tool can be cut into the material to be cut. In addition, the cutting machine main body is moved along the extending direction of the slide bar. This makes it possible to move the cutting tool with respect to the material to be cut in the extending direction of the slide bar. By moving the cutting tool with respect to the material to be cut in this way, the material to be cut can be cut.

The slide bar is arranged to the right of the right side of the cutting tool or to the left of the left side of the cutting tool when viewed from the user located on the front side of the tabletop cutting machine so as not to hinder the movement of the cutting tool. The invention described in Patent Document 1 has a slide bar extending from the right side surface of the cutting tool to the right along the side surface of the cutting tool. The motor housing accommodating the electric motor is arranged above the cutting tool and protrudes to the left opposite to the slide bar with respect to the cutting tool. When the user visually recognizes the cutting position of the cutting tool with respect to the material to be cut, the portion protruding to the left of the motor housing may hinder the visibility. Therefore, the user may need to lower his head to visually recognize the notch position.

The invention described in Patent Document 2 has a slide bar extending from the left side surface of the cutting tool to the left along the side surface of the cutting tool. The motor housing accommodating the electric motor is arranged on the right side of the cutting tool, and the cutting tool is arranged in an inclined posture in a vertical state. The tilting direction of the motor housing is a direction in which the motor housing is tilted upward as it moves away from the cutting tool to the right when viewed from the front side. When the user visually recognizes the cutting position of the cutting tool with respect to the material to be cut, the slide bar located on the left side of the cutting tool may obstruct the visibility. Therefore, the user may need to lower his head to visually recognize the notch position.

Japanese Unexamined Patent Publication No. 2005-279933 Japanese Unexamined Patent Publication No. 2018-89867

As described above, the tabletop cutting machine has room for improvement in order to improve the visibility of the cutting position of the cutting tool. Therefore, a desktop cutting machine having good visibility of the cutting position of the cutting tool has been conventionally required.

According to one feature of the present disclosure, the desktop cutting machine has a long slide bar extending in the front-rear direction, a slide base attached to the slide bar and moving along the slide bar, and a slide base in the vertical direction. It has a cutting machine body that is movably mounted. The main body of the cutting machine is an electric motor located between the cutting tool and the slide bar when viewed from the front when the output shaft is rotated and the cutting tool is vertical, and the output shaft that extends in the axial direction orthogonal to the slide bar and the cutting tool is attached. Equipped with a motor.

Therefore, the slide bar and the electric motor are arranged on one side surface side (for example, the right side surface side) with respect to the cutting tool. Therefore, it is possible to provide a tabletop cutting machine without having a structure that projects to the other side surface side (for example, the left side surface side) with respect to the cutting tool. As a result, the visibility of the cutting position of the cutting tool on the other side surface side of the cutting tool can be improved.

It is the whole perspective view which looked at the tabletop cutting machine which concerns on 1st Embodiment from the right. It is the whole perspective view which looked at the tabletop cutting machine from the left. It is a left side view of the tabletop cutting machine in the state where the cutting machine main body is located at the top dead center. It is a right side view of the tabletop cutting machine in the state where the cutting machine main body is located at the top dead center. It is a top view of the tabletop cutting machine in the state where the cutting machine main body is located at the top dead center. It is a front view of the tabletop cutting machine in the state where the cutting machine main body is located at the top dead center. FIG. 4 is a cross-sectional view taken along the line VII-VII in FIG. 4 and is a cross-sectional view of the main body of the cutting machine. FIG. 4 is a cross-sectional view taken along the line VIII-VIII in FIG. 4 and is a cross-sectional view of the main body of the cutting machine. FIG. 4 is a cross-sectional view taken along the line IX-IX in FIG. 4 and is a cross-sectional view of the main body of the cutting machine. It is a left side view including a partial vertical cross section of a tabletop cutting machine. It is a bottom view including a partial cross section of a tabletop cutting machine excluding a base. 10 is a cross-sectional view taken along the line XII-XII in FIG. 10, which is a vertical cross-sectional view of an arm support portion and a main body support arm. It is a right side view of the tabletop cutting machine in the state where the cutting machine main body is located at the bottom dead center. It is a left side view of the tabletop cutting machine in the state where the cutting machine main body is located at the bottom dead center and the movable cover is moved upward. It is a front view of the tabletop cutting machine in the state where the cutting machine main body is located at the bottom dead center. It is a front view of the tabletop cutting machine in a state where the cutting machine main body is tilted to the left. It is a front view of the tabletop cutting machine in a state where the cutting machine main body is tilted to the right. It is a right side view of the tabletop cutting machine in the state where the cutting machine main body is tilted to the right. It is a right side view of the tabletop cutting machine in a state where the cutting machine main body moves backward and is located at the bottom dead center. It is a left side view of the tabletop cutting machine in a state where the cutting machine main body moves backward and is located at the top dead center. It is the whole perspective view which looked at the tabletop cutting machine which concerns on 2nd Embodiment from the left. It is a top view of the tabletop cutting machine in the state where the cutting machine main body is located at the top dead center. It is a rear view of the tabletop cutting machine in the state where the cutting machine main body is located at the top dead center. It is a right side view which shows the state which the cutting machine main body of the tabletop cutting machine which concerns on 3rd Embodiment is located at the bottom dead center. It is a left side view which shows the state which the cutting machine main body is located at the bottom dead center. It is a top view which shows the state which the cutting machine main body is located at the bottom dead center. FIG. 26 is a cross-sectional view taken along the line XXVII-XXVII in FIG. 26, and is a vertical cross-sectional view of a part of the motor housing and the gear housing. FIG. 24 is a cross-sectional view taken along the line XXVIII-XXVIII in FIG. 24 and is a vertical cross-sectional view of the main body of the cutting machine.

According to other features of the present disclosure, the electric motor has a motor shaft. The motor shaft is tilted parallel to the side surface of the cutting tool or tilted at 10 ° or less with respect to the side surface when viewed from the radial direction of the motor shaft when the cutting tool is vertical. Therefore, the motor shaft can be arranged in a posture along the side surface of the cutting tool. Therefore, the electric motor can be placed close to the cutting tool. As a result, the cutting tool and the electric motor are arranged compactly in the left-right direction. Thus, the cutting machine body can be made compact in the left-right direction.

According to another feature of the present disclosure, the center of the electric motor is arranged at a position of 30 to 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 located closer to the cutting tool than the slide bar. Therefore, the center of gravity of the cutting machine body in the left-right direction can be brought closer to the cutting tool. As a result, when the cutting machine main body is moved downward to cut the cutting tool into the material to be cut, the twisting moment due to the reaction force received by the cutting machine from the material to be cut and the own weight of the cutting machine main body can be reduced.

According to other features of the present disclosure, the slide bar has one bar or a plurality of bars arranged side by side. At least one bar of one bar or a plurality of bars is positioned so that the cutting machine body overlaps the electric motor when viewed axially at bottom dead center. Therefore, when the cutting machine main body is at bottom dead center, the electric motor can be arranged at a low position. As a result, the amount of protrusion of the electric motor upward is suppressed. This makes the desktop cutting machine compact. Further, when the cutting machine main body is tilted in the left-right direction to cut into the material to be cut, it is possible to prevent the upper part of the electric motor from obstructing the visibility of the cut position.

According to other features of the present disclosure, at least one bar is located at the lowest position of the plurality of bars. Therefore, the electric motor can be arranged near the lowest point where the electric motor can be arranged. Therefore, the amount of upward protrusion of the electric motor can be minimized. As a result, the desktop cutting machine can be suitably and compactly provided.

According to other features of the present disclosure, the plurality of bars include a first bar located at the top and a second bar located at the bottom. When the diameter of the first bar is a [mm], the diameter of the second bar is b [mm], the distance between the centers of the first bar and the second bar is c [mm], and the diameter of the cutting tool is d [mm]. , (A / 2 + b / 2 + c) × 2 <d <(a / 2 + b / 2 + c) × 3.5. Therefore, a plurality of bars can be compactly accommodated within a length range shorter than half the diameter of the cutting tool in the vertical direction. Moreover, the vertical distance including all of the plurality of bars is larger than 2/7 times the diameter of the cutting tool. Therefore, a plurality of bars can be provided so as to have sufficient strength to support the cutting machine main body. In this way, it is possible to achieve both the compactness of the slide structure of the cutting machine body and the supporting strength.

According to another feature of the present disclosure, the cutting machine body is slid in the traveling direction with respect to the slide bar when cutting the material to be cut by the cutting tool. The electric motor has a motor shaft. The motor shaft is oriented with an inclination angle that inclines upward toward the traveling direction when the cutting machine main body is located at the bottom dead center. When the cutting machine body is located at the bottom dead center, the amount of downward protrusion of the electric motor can be minimized. This makes the desktop cutting machine compact in the vertical direction.

According to other features of the present disclosure, the tilt angle of the motor shaft is 30 ° to 60 ° with respect to the horizon when the cutting machine body is located at bottom dead center. Therefore, it is possible to prevent the motor housing accommodating the electric motor from coming into contact with the material to be cut. Therefore, the material to be cut can be suitably cut by using a compact desktop cutting machine.

According to other features of the present disclosure, the motor shaft has an inclination angle of 10 ° or less parallel to or with respect to the horizon when the cutting machine body is located at top dead center. Therefore, the amount of protrusion of the electric motor upward or downward can be suppressed. This makes it possible to prevent the visibility from being hindered when confirming the cutting position of the cutting tool.

According to other features of the present disclosure, the desktop cutting machine has an operating handle used to move the cutting machine body with respect to the slide bar. The center of the operating handle is located on the virtual plane containing the cutting tool or between the slide bar and the cutting tool when viewed from the front when the cutting tool is vertical. Therefore, the center of the slide bar and the operation handle can be brought closer to the left-right direction. Therefore, when the user grips the operation handle and cuts the cutting tool into the material to be cut, the twisting moment of the cutting machine body with respect to the slide bar can be reduced. Furthermore, the center of the cutting tool and the operation handle can be brought closer to the left and right. Therefore, when the user grips the operation handle and cuts the cutting tool into the material to be cut, the twisting moment due to the reaction force received by the cutting tool from the material to be cut and the operating force for operating the operation handle can be reduced.

According to another feature of the present disclosure, the center of the operating handle is located at a position of 30 to 70% of the distance from the cutting tool to the slide bar in the direction perpendicular to the surface of the cutting tool starting from the cutting tool. Therefore, the center of the operating handle is positioned not too far from both the cutting tool and the slide bar. Therefore, the twisting moment of the cutting machine body acting between the cutting tool and the operation handle can be reduced. Moreover, it is possible to suppress the bending of the slide bar due to the operating force for operating the operation handle.

According to another feature of the present disclosure, the tabletop cutting machine has a bottom dead center stopper that regulates the movement of the cutting machine body below the bottom dead center. The center of the bottom dead center stopper is located between the slide bar and the cutting tool when viewed from the front when the cutting tool is vertical. Therefore, the distance between the center of the bottom dead center stopper and the slide bar can be shortened. The bottom dead center stopper receives a reaction force when the cutting machine body descends to the bottom dead center. Therefore, by shortening the distance, the twisting moment of the cutting machine body with respect to the slide bar due to the reaction force can be reduced.

According to another feature of the present disclosure, the center of the bottom 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 surface of the cutting tool with the cutting tool as the starting point. Therefore, the center of the bottom dead center stopper is positioned not too far from both the cutting tool and the slide bar. Therefore, the reaction force received by the bottom dead center stopper and the twisting moment of the cutting machine body acting between the slide bars can be reduced, and the shake of the cutting tool due to the twisting moment can be suppressed.

According to other features of the present disclosure, the desktop cutting machine has an operating handle used to move the cutting machine body with respect to the slide bar. The tabletop cutting machine has a movable cover that covers a part of the cutting tool and is movable with respect to the cutting machine body. The tabletop cutting machine has a carrying handle that is used when carrying the tabletop cutting machine and has a configuration 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 arranged compactly so as not to interfere with the visibility of the notch position, and can be arranged so as not to interfere with the operation of the movable cover.

According to another feature of the present disclosure, the tabletop cutting machine has a power transmission shaft extending in a direction intersecting the motor shaft of the electric motor and arranged in a power transmission path from the motor shaft to the cutting tool. The tabletop cutting machine has a gear attached to a motor shaft or a power transmission shaft, and a gear housing containing the gear. The gear housing has a first opening through which the motor shaft penetrates and a second opening through which the power transmission shaft penetrates and opens in a direction intersecting the opening direction of the first opening. The gear housing is composed of one part. Therefore, the gear housing accommodates at least a part of the motor shaft extending in different directions, at least a part of the power transmission shaft, and the gear, and is formed compactly. As a result, the cutting machine body can be made compact in the left-right direction and the front-back direction. Further, the strength of the gear housing can be increased by being composed of one component.

According to another feature of the present disclosure, the gear housing supports a set of gears connecting the motor shaft and the power transmission shaft, and the set of gears is a bevel gear. Therefore, power can be transmitted by a set of bevel gears from the motor shaft extending in the front-rear direction to the power transmission shaft extending in the left-right direction. Therefore, the gear housing that supports one set of bevel gears can be compactly formed in the left-right direction and the front-back direction.

According to another feature of the present disclosure, the cutting machine main body has an exhaust port which is arranged in the same front-rear position as the electric motor or in front of the electric motor and opens toward the rear. 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 located in front of the desktop cutting machine. Therefore, it is possible to suppress the scattering of chips toward the user. Further, when the cutting machine main body is tilted in the left-right direction to perform tilt cutting, it is possible to suppress the exhaust air from being discharged toward the material to be cut located below the electric motor. Therefore, it is possible to prevent chips from being rolled up on the material to be cut.

According to other features of the present disclosure, the exhaust air discharged from the exhaust port flows in parallel and in the opposite direction to the cooling air that is cooling the electric motor. Therefore, the intake port is arranged behind the electric motor. Therefore, it is possible to prevent chips floating near the intake port from being sucked into the intake port. Moreover, the exhaust air flows in parallel and in the opposite direction to the cooling air flowing along the axial direction of the electric motor. Therefore, the exhaust air is discharged so as not to be separated from the motor housing accommodating the electric motor in the vertical direction or the horizontal direction. This makes it possible to further suppress the scattering of chips on the material to be cut.

According to another feature of the present disclosure, the desktop cutting machine has a controller for controlling the output of an electric motor. The controller is located above the electric motor when the cutting machine body is located at bottom dead center. Therefore, the controller can be arranged so that the cutting machine body becomes compact in the left-right direction. Further, the amount of protrusion of the controller downward can be suppressed. Therefore, it is possible to prevent the controller housing accommodating the controller from coming into contact with the material to be cut when the cutting machine main body is located at the bottom dead center.

According to other features of the present disclosure, it has a controller that controls the output of the electric motor. The controller overlaps the electric motor in the left-right direction when the cutting machine body is located at the bottom dead center. Therefore, the controller and the electric motor can be compactly arranged in the left-right direction.

According to another feature of the present disclosure, the desktop cutting machine has a fan that is rotated by an electric motor to generate a wind that cools the electric motor, and a controller that controls the output of the electric motor. The controller is cooled by utilizing the wind generated by the fan. Therefore, both the electric motor and the controller can be efficiently cooled by using the fan.

The first embodiment of the present disclosure will be described with reference to FIGS. 1 to 20. In this embodiment, a cutting machine (desktop cutting machine) 1 called a so-called slide circular saw is exemplified. As shown in FIG. 1, the cutting machine 1 has a base 2 placed on a tabletop, a floor, or the like, a turntable 4 for placing a material to be cut, and a cutting machine main body 10. The turntable 4 is rotatably supported above the base 2 in a horizontal direction about a rotary support shaft 2a (see FIG. 10). The cutting machine main body 10 is provided above the turntable 4. A substantially disk-shaped cutting tool 11 called a tip saw (English name: tipped saw blade) is rotatably supported on the cutting machine main body 10. The user is located in front of the cutting machine 1 to perform cutting work. In the following description, the vertical and horizontal directions of the members and configurations are specified with reference to the user. The front-back direction of the members and configurations is such that the front side is the front side when viewed from the user.

As shown in FIGS. 2 and 3, the turntable 4 has a substantially circular shape in a plan view, and the table upper surface 4a is provided horizontally. The turntable 4 has a rotation center in the center of a substantially disk shape and can rotate in the horizontal direction. The base 2 has auxiliary tables 3 having the same upper surface height as the table upper surface 4a on both the left and right sides of the turntable 4. The turntable 4 has a table extension portion 5 extending along the blade surface direction of the cutting tool 11. A blade edge plate 5a is provided on the upper surfaces of the turntable 4 and the table extension portion 5. In the center of the cutting edge plate 5a, a notch-shaped groove hole 5b extending along the blade surface of the cutting tool 11 is provided.

As shown in FIG. 1, an adjust bolt 68 for supporting the table extension portion 5 from below is provided at the lower portion of the table extension portion 5. The adjust bolt 68 is supported by the table extension portion 5 and can be moved up and down by screw operation. The adjust bolt 68 is moved up and down so that the lower end of the adjust bolt 68 comes into contact with the mounting surface of the base 2. As a result, the adjust bolt 68 can adjust the height of the table extension portion 5. In addition, the rattling of the installation of the table extension portion 5 is eliminated.

As shown in FIGS. 1 and 3, a wall-shaped positioning fence 6 extending in the left-right direction and extending upward is provided above the turntable 4 and the auxiliary table 3. The positioning fence 6 is supported by the left and right auxiliary tables 3. The positioning surface 6a, which is the front surface of the positioning fence 6, is located on a vertical surface passing through the center of rotation of the turntable 4. The material to be cut placed on the turntable 4 is positioned in the front-rear direction by hitting the positioning surface 6a.

As shown in FIGS. 1 and 3, an arc-shaped miter scale plate 7 is provided in a region substantially half of the front portion of the base 2. The miter scale plate 7 is provided so as to extend horizontally below the table upper surface 4a. The miter scale plate 7 is provided with a plurality of groove-shaped positioning recesses 7b extending in the radial direction. The positioning recesses 7b are provided at predetermined angular intervals in the circumferential direction of the miter scale plate 7. The tip of the positioning pin 66a, which will be described later, can enter the positioning recess 7b. The miter scale plate 7 is fixed to the base 2 by a fixing screw 7a. The fixing screw 7a is inserted into the elongated hole. The angle between the positioning fence 6 and the cutting tool 11 can be finely adjusted by loosening the fixing screw 7a and moving the miter scale plate 7 in the left-right direction. For example, if 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 fence 6 can be precisely adjusted. This adjustment is mainly made during the production process of the product.

As shown in FIGS. 1 and 6, a main body support arm 50 extending substantially upward is provided behind the turntable 4. The main body support arm 50 is supported so as to be tiltable in the left-right direction with respect to the turntable 4 with the left-right tilt support shaft 50a extending in the front-rear direction as the center. The main body support arm 50 is tilted substantially to the right as the cutting tool 11 is vertical and is directed upward. As shown in FIGS. 19 and 20, the main body support arm 50 has a shape retracted from the movable region of the battery 33 attached to the cutting machine main body 10 and the battery mounting portion 32 when the slide base 17 described later is moved to the rear end. It has become.

As shown in FIGS. 1 and 6, a long slide bar 51 extending along the blade surface of the cutting tool 11 and extending along the horizontal line is provided on the upper portion 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 vertical direction. A slide base 17 is slidably attached to the first bar 51a and the second bar 51b in the front-rear direction. The cutting machine main body 10 is connected to the left side of the slide base 17. Therefore, the cutting machine main body 10 is located to the left of the first bar 51a and the second bar 51b in a state where the cutting tool 11 is vertical. By sliding the slide base 17 in the front-rear direction, it is possible to cut, for example, a wide material to be cut placed on the turntable 4.

As shown in FIGS. 5, 6 and 13, the first bar 51a is formed in a cylindrical shape having a diameter of 51e, for example, 20 mm. The second bar 51b is formed in a cylindrical shape having a diameter of 51f, which is larger than the diameter 51e at 25 mm, for example. The center 51c of the first bar 51a and the center 51d of the second bar 51b extend in the front-rear direction in parallel with each other. The positions of the center 51c of the first bar 51a and the center 51d of the second bar 51b in the left-right direction are, for example, the same positions. The first virtual plane S1 is a virtual plane that passes through the center of the base metal of the cutting tool 11 in the thickness direction and extends in the same direction as the base metal of the cutting tool 11. The virtual plane through which the center 51c of the first bar 51a and the center 51d of the second bar 51b pass 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 bar 51a and the center 51d of the second bar 51b are arranged in the vertical direction with a distance of 51 g between the centers, for example, 55 mm. The diameters 51e and 51f and the center-to-center distance 51g are as follows, where the diameter 51e is a [mm], the diameter 51f is b [mm], the center-to-center distance 51g is c [mm], and the diameter of the cutting tool 11 is d [mm]. It is set to satisfy the relationship of equation 1). For example, in the case of the cutting machine 1 equipped with the cutting tool 11 having a diameter of 190 mm, the diameters 51e and 51f and the center-to-center distance 51 g are set so that 54 [mm] <(a / 2 + b / 2 + c) <95 [mm]. ..
(Equation 1) (a / 2 + b / 2 + c) x 2 <d <(a / 2 + b / 2 + c) x 3.5

As shown in FIG. 12, the arm support portion 4b has a pair of left and right inclined stopper bolts 4c. The tip of the inclined stopper bolt 4c projects into the arm support portion 4b. The amount of protrusion of the inclined stopper bolt 4c can be adjusted by rotating the inclined stopper bolt 4c around the axis using a hexagon wrench or the like. This adjustment is mainly made during the production process of the product.

As shown in FIGS. 10 and 12, a maximum tilt angle switching lever 52 is provided at the lower rear portion of the main body support arm 50. The maximum tilt angle switching lever 52 has a lever shaft 52a that is parallel to the left / right tilt support shaft 50a and extends forward. The lever shaft 52a has a cylindrical shape. The front portion of the lever shaft 52a is provided with a width across flats 52b formed by two planes that are parallel to the axial direction and have an axially symmetric positional relationship. The front portion of the lever shaft 52a comes into contact with the tilted stopper bolt 4c by tilting the main body support arm 50 to the left or right. By rotating the maximum tilt angle switching lever 52 around the axis of the lever shaft 52a, the portion of the lever shaft 52a that comes into contact with the tilt stopper bolt 4c is switched.

As shown in FIGS. 10 and 12, the main body support arm 50 can be tilted in the left-right direction up to an angle A at which the lever shaft 52a abuts on either the left or right tilted stopper bolt 4c. When the inclined stopper bolt 4c and the arc-shaped portion of the lever shaft 52a come into contact with each other, the cutting tool 11 can be tilted up to 45 ° in each of the left-right directions. When the tilting stopper bolt 4c and the width across flats 52b come into contact with each other, the cutting tool 11 can be tilted in each of the left-right directions up to, for example, 46 °. By tilting the cutting tool 11 to the left or right, so-called tilt cutting can be performed on the material to be cut placed on the turntable 4.

As shown in FIGS. 3 and 14, the cutting tool 11 is rotatably attached to the cutting machine main body 10 so that the blade surface extends in the front-rear direction. The cutting machine main body 10 has a vertical swing support shaft 10a whose axial direction extends in the left-right direction behind the cutting tool 11. The cutting machine main body 10 can swing in the vertical direction with respect to the slide base 17 about the vertical swing support shaft 10a. By swinging the cutting machine main body 10 downward, the cutting tool 11 can be cut into the material to be cut placed on the turntable 4. The vertical swing angle of the cutting machine main body 10 is 40 ° at the top dead center when the bottom dead center is 0 °. In other words, the cutting machine main body 10 can swing within a range of an angle of 40 °.

As shown in FIGS. 2, 3 and 14, the cutting machine main body 10 includes a fixed cover 12 and a movable cover 13. The fixed cover 12 covers the range of the upper half circumference of the cutting tool 11 from both the left and right sides and from the outside in the radial direction. On the left side of the fixed cover 12, a white arrow 12a indicating the rotation direction of the cutting tool 11 is displayed. The movable cover 13 can cover the range of the lower half circumference of the cutting tool 11. The movable cover 13 rotates in conjunction with the vertical swing of the cutting machine main body 10 to open and close the lower half circumference of the cutting tool 11. When the cutting machine main body 10 is swung upward, the movable cover 13 rotates in the closed position direction (clockwise in FIG. 3). This covers the lower half circumference range of the cutting tool 11. When the cutting machine main body 10 is swung downward, the movable cover 13 rotates in the opening position direction (counterclockwise direction in FIG. 14). As a result, the lower half circumference range of the cutting tool 11 is exposed, and the material to be cut placed on the turntable 4 can be cut.

As shown in FIG. 7, the cutting tool 11 is integrally attached to an output shaft 27 extending in the left-right direction and rotatably supported by the cutting machine main body 10. The cutting tool 11 is attached to the output shaft 27 by tightening the fixing screw 14 with the center of rotation sandwiched between the outer flange 15 and the inner flange 16.

As shown in FIG. 2, a dust collecting guide 18 is provided on the lower rear side of the fixed cover 12. The dust collecting guide 18 has a wall shape having a substantially C-shape in a plan view, which extends in the vertical direction and opens in the front. The dust collecting guide 18 suppresses the chips generated by cutting the material to be cut from scattering to the rear or both left and right sides of the cutting tool 11. The upper part of the dust collection guide 18 communicates with the dust discharge port 18a extending rearward from the rear part of the cutting machine main body 10. By connecting the dust collecting hose connected to the dust collector to the dust discharge port 18a, the chips scattered around the dust collecting guide 18 can be sent to the dust collector.

As shown in FIGS. 6 and 19, a bottom dead center stopper 19 is provided on the right side of the cutting machine main body 10. The bottom dead center stopper 19 is composed of a protruding portion 19a attached to the right side surface of the fixed cover 12 and protruding to the right, and a bolt 19b penetrating the protruding portion 19a in the vertical direction. The protrusion 19a is provided with a through hole in which a female screw is formed in the vertical direction. A bolt 19b is screwed into the through hole in a posture in which the screw tip is downward and the screw head is upward. The thread of the bolt 19b is coated with a synthetic resin for preventing loosening. By changing the screwing position of the bolt 19b, the height of the screw tip of the bolt 19b is changed. The screwing position of the bolt 19b is changed by inserting a hexagon wrench into the hexagonal hole of the head and rotating it. As a result, the position of the bottom dead center of the cutting machine main body 10 can be finely adjusted. The bottom dead center stopper 19 is located between the side surface of the cutting tool 11 and the slide bar 51 in the left-right direction. A bottom dead center stopper contact portion 17a that comes into contact with the screw tip of the bolt 19b of the bottom dead center stopper 19 when the cutting machine main body 10 is lowered to the bottom dead center is provided on the front surface of the slide base 17.

As shown in FIGS. 2, 10 and 14, a grooving depth adjusting screw 96 is provided on the left side of the rear portion of the fixing cover 12. A release lever 95 is provided adjacent to the grooving depth adjusting screw 96. The release lever 95 is connected to the slide base 17 so as to be tiltable in the left-right direction with the rear end as the center. The release lever 95 can tilt about the tilting support shaft 97 between the initial position extending in the front-rear direction following the fixed cover 12 and the release position where the front end is separated to the left from the fixed cover 12. .. The upper surface of the release lever 95 is provided with a recess into which the lower end of the grooving depth adjusting screw 96 can enter. The lower end of the grooving depth adjusting screw 96 can enter the recess from above when the release lever 95 is located at the initial position. Therefore, when the release lever 95 is located at the initial position, in the cutting machine main body 10, the lower end of the grooving depth adjusting screw 96 enters the recess and the bottom dead center stopper 19 comes into contact with the bottom dead center stopper contact portion 17a. It can be lowered to bottom dead center. When the release lever 95 is located at the release position, the lower end of the grooving depth adjusting screw 96 cannot enter the recess of the release lever 95 and comes into contact with the upper surface of the release lever 95. Therefore, when the release lever 95 is located at the release position, the bottom dead center of the cutting machine main body 10 is higher than the bottom dead center set by the bottom dead center stopper 19 (the lower end of the cutting tool 11 is above the table upper surface 4a). Position). The grooving depth adjusting screw 96 has a male screw shape extending in the vertical direction. The grooving depth adjusting screw 96 is connected to the fixing cover 12 in a screw structure so as to be movable in the vertical direction. By rotating the grooving depth adjusting screw 96, the height of the lower end of the grooving depth adjusting screw 96 with respect to the fixing cover 12 moves up and down. For example, a knurl is formed on the head of the grooving depth adjusting screw 96. Further, the male thread portion of the grooving depth adjusting screw 96 is not provided with, for example, a synthetic resin for preventing loosening. Therefore, the grooving depth adjusting screw 96 can be rotated and operated by hand. A hexagonal hole is formed in the end surface of the head of the grooving depth adjusting screw 96. Therefore, it can be rotated with a wrench with a hexagonal hole.

As shown in FIGS. 6 and 19, the bottom dead center stopper contact portion 17a is a flat surface provided on the upper surface of a protrusion protruding forward on the front surface of the slide base 17. This makes it possible to prevent the cutting machine main body 10 from falling below the bottom dead center. Further, a top dead center stopper 23 is provided below the bottom dead center stopper 19 and below the right side surface of the fixed cover 12. The top dead center stopper 23 is formed of a rubber sleeve and is screwed to the fixing cover 12. The top dead center stopper contact portion 17b is provided on a flat surface provided on the lower surface of the above-mentioned protrusion. The top dead center stopper 23 and the top dead center stopper contact portion 17b come into contact with each other to position the top dead center of the cutting machine main body 10.

As shown in FIG. 6, 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 in a state where the cutting tool 11 is vertical and the cutting machine main body 10 is located at the top dead center. And it is located to the left of the slide bar 51. The center 19c is preferably 30 to 70% of the distance from the cutting tool 11 to the center 51c of the first bar 51a (or the center 51d of the second bar 51b) from the cutting tool 11 toward the right in the direction perpendicular to the surface of the cutting tool 11. It is placed at the position of, for example, 42% of the 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, it is 48 mm / 115 mm = 42%.

As shown in FIGS. 4 and 5, the cutting machine main body 10 has a motor housing 20 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 the electric motor 21. The vertical position of the electric motor 21 is a position where the cutting machine main body 10 is located at the bottom dead center and the cutting tool 11 is vertical and overlaps with the second bar 51b in a side view (see FIG. 13). The electric motor 21 is housed so that the motor shaft 21a is along the longitudinal direction of the substantially cylindrical motor housing 20.

As shown in FIG. 7, the motor shaft 21a is parallel to the side surface of the cutting tool 11. 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 ° when viewed from the extending direction of the cutting tool 11 and the radial direction of the motor shaft 21a (reverse of the motor shaft 21a). Tilt to the left with respect to the gear side parallel to the cutting tool (0 °) is a minus, and leaning to the right is a plus). Within this angle range, it is only necessary to change the mutual axial angle of the bevel gears that mesh with each other, and it is not necessary to make a major change in the design concept such as adding parts.

As shown in FIG. 4, the motor shaft 21a is preferably in the range of −10 ° to 0 ° to 10 ° with respect to the horizon in a state where the cutting tool 11 is vertical and the cutting machine main body 10 is located at the top dead center. Tilt (minus is that the anti-gear side of the motor shaft 21a is tilted downward with respect to the horizontal line (0 °), and positive is that it is tilted upward). In the present embodiment, the motor shaft 21a is parallel to the horizon when the cutting machine main body 10 is located at the top dead center. At top dead center, the entire motor shaft 21a is located below the central axis of the first bar 51a of the slide bar 51 and above the central axis of the second bar 51b. Further, the entire motor shaft 21a is arranged below the lower end of the first bar 51a of the slide bar 51 and above the upper end of the second bar 51b. In this way, the motor shaft 21a at top dead center can be made compact in the vertical direction.

As shown in FIG. 13, when the cutting machine main body 10 is located at the bottom dead center, the motor shaft 21a inclines upward as the anti-gear side moves backward. The tilt angle is 40 ° with respect to the horizon. The motor shaft 21a is tilted in the range of 30 to 60 ° with respect to the horizontal line, more preferably in the range of 35 to 45 °, in a state where the cutting tool 11 is vertical and the cutting machine main body 10 is located at the bottom dead center. Tilt. In this way, the motor shaft 21a at top dead center can also be made compact in the vertical direction.

As shown in FIG. 6, the motor shaft 21a, which is the center of the electric motor 21, is located on the right side of the cutting tool 11 and slides in a state where the cutting tool 11 is vertical and the cutting machine main body 10 is located at the top dead center. Located to the left of bar 51. The motor shaft 21a preferably has a distance of 30 to 50 from the cutting tool 11 to the center 51c of the first bar 51a (or the center 51d of the second bar 51b) in the direction perpendicular to the plane of the cutting tool 11 starting from the cutting tool 11. It is placed at the% position, for example, at 39% of the 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, it is 45 mm / 115 mm = 39%.

As shown in FIG. 7, a motor called a DC brushless motor is used as the electric motor 21. The motor shaft 21a is rotatably supported around the axis in a posture along the longitudinal direction of the motor housing 20. The stator 21b of the electric motor 21 is non-rotatably supported on the inner peripheral surface of the motor housing 20. The rotor 21c of the electric motor 21 is arranged on the inner peripheral side of the stator 21b. The rotor 21c is attached to the motor shaft 21a and is rotatable together with the motor shaft 21a. The rotation angle of the rotor 21c is detected by the sensor substrate 21d provided at the opposite end of the inner peripheral surface of the motor housing 20 on the opposite gear side.

As shown in FIG. 7, an intake port 20a capable of taking in outside air is provided on the rear surface (opposite gear side end surface) of the motor housing 20 in the extending direction of the motor shaft 21a. A fan 22 is rotatably attached to the front (gear side) of the electric motor 21 in the extending direction of the motor shaft 21a so as to be integrally with the motor shaft 21a. When the electric motor 21 is started and the fan 22 rotates, cooling air is introduced into the motor housing 20 from the intake port 20a. The introduced cooling air flows toward the fan 22 in front of the motor shaft 21a in the extending direction. The cooling air flowing axially through the fan 22 is bent outward in the radial direction of the fan 22. As shown in FIG. 1, an exhaust port 20b capable of discharging 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. Cooling air is discharged from the exhaust port 20b located outside the radial direction of the fan 22. Thus, the electric motor 21 is cooled by the cooling air flowing inside the motor housing 20.

As shown in FIG. 7, a gear housing 25 is connected to the front portion of the motor housing 20 in the extending direction of the motor shaft 21a. The gear housing 25 is also connected to the right side surface of the fixed cover 12. A first opening 25a that opens toward the opposite gear side in the motor axial direction is provided at the rear portion of the gear housing 25 in the extending direction of the motor shaft 21a. A second opening 25b that opens to the left is provided on the left side of the gear housing 25. The first opening 25a and the second opening 25b are communicated with each other via the inside of the gear housing 25. The first opening 25a has an in-row coupling with the motor housing 20. Since the mounting portion and the hole portion 20c of the motor housing 20 are the same parts, 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 has an in-row connection with the fixed cover 12. The attachment portion of the second opening 25b and the fixing cover 12 is a circle having high precision roundness.

As shown in FIG. 7, the gear housing 25 accommodates the intermediate shaft 26. The intermediate shaft 26 extends in a direction perpendicular to the side surface (left-right direction) of the cutting tool 11 and is rotatably supported by the gear housing 25. A reduction gear 26b is formed as an integral part on the left side of the intermediate shaft 26. The driven side bevel gear 26a is inserted on the right side of the intermediate shaft 26 by an intermediate fitting, and is movable in the axial direction. The driven side bevel gear 26a and the intermediate shaft 26 are relatively detented by the key 26c. Further, a steel washer 26d, a rubber ring 26e, and a steel washer 26f are provided on the right side of the driven side bevel gear 26a. A wheel chock 26g is attached to the rubber ring 26e sandwiched between the washers 26d and 26f so as to be in a state of being crushed in the axial direction.

As shown in FIG. 7, the front portion of the motor shaft 21a in the extending direction penetrates the first opening 25a and enters the gear housing 25. A drive-side bevel gear 21e is integrally attached to the front portion of the motor shaft 21a in the extending direction with the motor shaft 21a. The drive-side bevel gear 21e meshes with the driven-side bevel gear 26a. The rotational power of the motor shaft 21a is decelerated and transmitted to the intermediate shaft 26 extending in a direction substantially perpendicular to the motor shaft 21a via the meshing of the drive side bevel gear 21e and the driven side bevel gear 26a.

As shown in FIG. 7, the first bearing 28a and the second bearing 28b are press-fitted into the motor shaft 21a. The inner ring of the first bearing 28a is press-fitted into the rear end of the motor shaft 21a in the extending direction, and the outer ring is press-fitted into the hole 20c at the inner rear end of the motor housing 20. The inner ring of the second bearing 28b is press-fitted into the front portion of the motor shaft 21a in the extending direction, and the outer ring is press-fitted into the hole portion 25c of the gear housing 25. A rubber pin 34 is press-fitted between the second bearing 28b and the hole 25c. The rubber pin 34 cushions impact and vibration.

As shown in FIG. 7, the third bearing 28c is press-fitted into the intermediate shaft 26 at the right end, and the fourth bearing 28d is press-fitted into the left end. The outer ring of the third bearing 28c is press-fitted into the hole 25d of the gear housing 25. A urethane 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 into the hole 29a of the bearing box 29 via a component in which the rubber ring 36 and the steel washer 37 are integrated. The urethane washer 35 and the rubber ring 36 cushion impact and vibration. By positioning both the second bearing 28b and the third bearing 28c in the holes 25c and 25d provided in the gear housing 25, the positions of the motor shaft 21a and the intermediate shaft 26 can be made highly accurate. .. Further, the meshing of the drive side bevel gear 21e and the driven side bevel gear 26a can be made highly accurate.

As shown in FIGS. 7 and 8, 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 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 29b of the bearing box 29. The output shaft 27 is arranged below the intermediate shaft 26 in a posture parallel to the intermediate shaft 26. A reduction gear 27a, which is a separate component, is attached to the right end of the output shaft 27 by press fitting with 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 via the meshing of the reduction gear 26b and the reduction gear 27a. The intermediate shaft 26 and the output shaft 27 are arranged in the power transmission path from the motor shaft 21a to the cutting tool 11, and correspond to the power transmission shaft in the present disclosure. Thus, the rotational power of the motor shaft 21a is decelerated and transmitted to the output shaft 27, so that the cutting tool 11 rotates.

As shown in FIGS. 1 and 9, a rectangular box-shaped controller housing 30 is connected to the rear portion of the motor housing 20. The controller housing 30 is provided with a controller 31. The controller 31 has a shallow rectangular parallelepiped case and a resin-molded control board housed in the case. The controller 31 is housed in the controller housing 30 in a posture in which the longitudinal direction is along the vertical direction and the thickness direction (the direction in which the shortest side of the case extends) is along the front-rear direction. The controller 31 is equipped with a control circuit, a drive circuit, an auto stop circuit, and the like for mainly controlling the operation of the electric motor 21 which is a brushless motor. The control circuit includes a microcomputer that transmits 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 auto stop circuit cuts off the power supply to the electric motor 21 so as not to be in an over-discharged or over-current state depending on the detection result of the state of the battery 33.

As shown in FIGS. 1 and 9, intake ports 30a capable of taking in outside air are provided on the left and right sides of the controller housing 30. The inside of the controller housing 30 communicates with the inside of the motor housing 20 via the communication port 30b. The communication port 30b is arranged in front of the intake port 30a and the controller 31 and in front of the intake port 20a in the extending direction of the motor shaft 21a. When the electric motor 21 is started and the fan 22 (see FIG. 7) rotates, a negative pressure is generated around the communication port 30b by the cooling air flowing inside the motor housing 20. As a result, as shown by the white arrow in FIG. 9, the cooling air that flows into the controller housing 30 from the intake port 30a and flows toward the communication port 30b also flows. Thus, the controller 31 is cooled by using the cooling air generated by the rotation of the fan 22.

As shown in FIGS. 4 and 5, a battery mounting portion 32 is provided at the rear portion 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. A substantially rectangular box-shaped battery 33 can be attached to the battery mounting portion 32 by sliding it from above to below. Further, the battery 33 can be removed from the battery mounting portion 32 by sliding it from the lower side to the upper side. The battery 33 is, for example, a lithium ion battery having an output voltage of 36 V. The battery 33 can be repeatedly charged by removing it from the battery mounting portion 32 and using a separately prepared charger. The battery 33 can be reused as a power source with other rechargeable power tools such as screw tighteners and electric drills.

As shown in FIGS. 1 and 6, the cutting machine main body 10 has a handle portion 40 on the right side of the side surface of the cutting tool 11 and on the left side of the slide bar 51 in a state where the cutting tool 11 is vertical. The left-right center surface of the operation handle 41 and the left-right center surface of the battery mounting portion 32 are flush with each other. Further, the motor shaft 21a is located on the same plane as the central surface of the operation handle 41 in the left-right direction. A loop-shaped operation handle 41 extending along the side surface of the cutting tool 11 is provided on the front portion of the handle portion 40. A switch lever 42 is provided on the inner peripheral side of the operation handle 41. The switch lever 42 can be pulled by the user while holding the operation handle 41 by hooking a finger. When the switch lever 42 is pulled, the electric motor 21 is activated and the cutting tool 11 is rotated. A lock-off button 43 is provided on the upper portion of the operation handle 41. By pressing the lock-off button 43, the operation of pulling the switch lever 42 becomes possible. As a result, the unexpected start of the electric motor 21 is avoided.

As shown in FIG. 6, the center 41a in the left-right direction of the operation handle 41 is located on the right side of the first virtual plane S1 in a state where the cutting tool 11 is vertical and the cutting machine main body 10 is located at the top dead center. Further, the center 41a is located on the left side of the slide bar 51 in a state where the cutting tool 11 is vertical and the cutting machine main body 10 is located at the top dead center. The center 41a is preferably the center 51c of the first bar 51a (or the center 51d of the second bar 51b) from the first virtual plane S1 toward the right in the plane perpendicular direction of the first virtual plane S1 starting from the first virtual plane S1. ) Is placed at a position of 30 to 70% of the distance, for example, at a position of 39% of the 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, it is 45 mm / 115 mm = 39%.

As shown in FIG. 1, switches 45 and 46 are provided on the right side portion of the handle portion 40. By pressing the switch 45, the laser beam of the laser irradiator 47 (see FIG. 9) for aligning the sumi lines can be switched on and off. The laser beam is applied to the cut surface and serves as a mark when the cutting tool 11 is aligned with the sumi line. By pressing the switch 46, the irradiation light of the illuminating tool 48 provided above the cutting machine main body 10 can be switched on and off. The illuminator 48 is supported by an arm 48a extending from the upper part of the handle portion 40. The irradiation light of the illuminating tool 48 brightens the periphery of the cutting region by the cutting tool 11.

As shown in FIG. 1, the handle portion 40 can be attached by inserting the communication adapter 49 behind the operation handle 41. The communication adapter 49 is capable of wireless communication with other ancillary equipment. By wireless communication, the cutting machine 1 and the auxiliary equipment can be started and stopped in conjunction with each other. With the communication adapter 49, for example, a dust collector installed separately from the cutting machine 1 and the cutting machine 1 can be interlocked with each other.

As shown in FIGS. 2, 14 and 15, the handle portion 40 includes a carrying handle 44 behind the operation 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 arranged behind the movable region 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 region of the movable cover 13. Further, the carrying handle 44 extends toward the right as it straddles the upper part of the movable region of the movable cover 13 and goes backward, and is connected to the second connecting portion 44b. The carrying handle 44 has a loop shape in cooperation with the fixed cover 12, the motor housing 20, and the controller housing 30. The carrying handle 44 extends in the longitudinal direction substantially along the front-rear direction and substantially horizontally in a state where the cutting machine main body 10 is moved to the bottom dead center.

As shown in FIGS. 5 and 15, a bottom dead center lock pin 38 is provided on the left side surface of the front portion of the slide base 17. The bottom dead center lock pin 38 is composed of a pin extending to the left and right and an operation unit provided at the left end of the pin. The slide base 17 is provided with a through hole extending in the left-right direction. The bottom dead center lock pin 38 has a pin inserted into the through hole and can be moved to the 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 lock 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 lock pin 38 to the right at the bottom dead center, the bottom dead center lock pin 38 can be engaged with the recess of the fixing cover 12. By engaging the bottom dead center lock pin 38 with the recess, the cutting machine main body 10 can be locked at the bottom dead center. The cutting machine 1 can be carried by the user by grasping the carrying handle 44 in a state where the cutting machine main body 10 is locked at the bottom dead center.

As shown in FIGS. 1 and 10, a turntable fixing mechanism 60 is provided at the lower part of the table extension portion 5. A grip portion 61 is provided on the front portion of the table extension portion 5. The grip portion 61 has an uneven shape on the peripheral edge portion so that the user can easily grip and rotate the grip portion 61. The user can grip the grip portion 61 and rotate the turntable 4 in the horizontal direction with respect to the base 2. The fixing rod 62 extends from the grip portion 61 toward the inside rear of the table extension portion 5. The fixing rod 62 is supported inside the table extension portion 5 by screw engagement. The grip portion 61 can rotate about the fixed rod 62 extending in the front-rear direction about the axis. When the grip portion 61 is rotated around the axis of the fixed rod 62, the fixed rod 62 is displaced in the front-rear direction. By displacing the fixed rod 62 rearward and engaging the rear end with the base 2, the turntable 4 can be positioned at an arbitrary miter angle with respect to the base 2. By displacing the fixed rod 62 forward, the positioning of the turntable 4 at an arbitrary miter angle can be released.

As shown in FIG. 10, the base 2 includes a horizontal plate portion 2b extending in the horizontal direction. The horizontal plate portion 2b extends toward the rotary support shaft 2a at substantially the same height as the miter scale plate 7. A sandwiching member 63 is provided behind the fixed rod 62. The sandwiching member 63 has a substantially L-shape when viewed from the left-right direction. The sandwiching member 63 has a rotation shaft 63a extending in the left-right direction in the vicinity of a substantially L-shaped bent portion. The sandwiching member 63 is rotatably supported by the table extension portion 5 about the rotation shaft 63a. One end of the L-shaped member 63 of the sandwiching member 63 can come into contact with the rear end of the fixed rod 62. The sandwiching member 63 has a sandwiching portion 63b capable of contacting the lower surface of the horizontal plate portion 2b at the other end of the L-shape.

When the fixed rod 62 shown in FIG. 10 is displaced rearward and comes into contact with the sandwiching member 63, the sandwiching member 63 rotates about the rotation shaft 63a. As a result, the sandwiching portion 63b is displaced upward and comes into contact with the lower surface of the horizontal plate portion 2b, and the horizontal plate portion 2b is sandwiched between the sandwiching portion 63b and the table extension portion 5. As a result, the table extension portion 5 and the sandwiching member 63 cannot move in the left-right direction with respect to the horizontal plate portion 2b. As a result, the rotation of the table extension portion 5 and the turntable 4 with respect to the base 2 is locked. When the fixing rod 62 is displaced forward, the force that pushes the sandwiching member 63 backward is reduced (or eliminated). At this time, the sandwiching member 63 rotates about the rotation shaft 63a, so that the sandwiching portion 63b is displaced downward. By displacing the sandwiching portion 63b downward, the sandwiching of the horizontal plate portion 2b by the sandwiching member 63 and the table extension portion 5 is released.

As shown in FIGS. 2 and 3, a positive lock mechanism 65 is provided at the lower part of the table extension portion 5. By using the positive lock mechanism 65, the turntable 4 can be positioned at a predetermined miter angle corresponding to the positioning recess 7b of the miter scale plate 7. The positive lock mechanism 65 includes a lock release lever 66 and a positioning pin 66a. The lock release lever 66 is provided on the left side of the front portion of the table extension portion 5. The positioning pin 66a is provided at the lower part of the table extension portion 5 so as to extend in the front-rear direction along the longitudinal direction of the table extension portion 5. The positioning pin 66a is provided at substantially the same height as the miter scale plate 7. The rear end of the positioning pin 66a can enter the positioning recess 7b by being displaced rearward. Further, the rear end of the positioning pin 66a can be disengaged from the positioning recess 7b by being displaced forward.

The front portion of the positioning pin 66a shown in FIGS. 3 and 10 is connected to the lock release lever 66. An engaging pin 66b extending perpendicular to the extending direction of the positioning pin 66a is provided at a substantially central portion in the front-rear direction of the positioning pin 66a. The engaging pin 66b is in contact with the pin support portion 67 provided integrally with the table extension portion 5. Inside the pin support portion 67, a lead surface (not shown) extending spirally in the front-rear direction is provided. The engaging pin 66b is in contact with the lead surface and its rearward displacement is restricted. The positioning pin 66a is urged rearward by a compression spring 66c.

When the lock release lever 66 shown in FIGS. 3 and 10 is pushed downward, the positioning pin 66a rotates about the axis and the engaging pin 66b is displaced forward along the lead surface inside the pin support portion 67. Therefore, the positioning pin 66a is displaced forward against the urging force of the compression spring 66c. The rear end of the positioning pin 66a displaced forward is disengaged from the positioning recess 7b. Therefore, when the positioning of the turntable 4 is released by the operation of the grip portion 61, the turntable 4 can be freely rotated in the left-right direction. When the lock release lever 66 is pulled upward, the positioning pin 66a rotates about the axis and the engaging pin 66b is displaced rearward along the lead surface inside the pin support portion 67. The positioning pin 66a is displaced rearward by the urging force of the compression spring 66c. The rear end of the positioning pin 66a abuts on the outer peripheral edge of the miter scale plate 7. When the grip portion 61 is gripped and the turntable 4 is rotated in the horizontal direction, the positioning pin 66a enters any of the positioning recesses 7b provided on the outer peripheral edge of the miter scale plate 7. Thus, the turntable 4 is positioned at a predetermined miter angle position corresponding to the positioning recess 7b.

As shown in FIG. 11, the front portion of the table extension portion 5 is provided with a tilting fixing mechanism 70 for holding the position of the main body support arm 50 so as to be tiltable in the left-right direction. The tilting fixing mechanism 70 has a tilting fixing operation unit 71 and a transmission shaft 73. The tilt fixing operation portion 71 is provided between the grip portion 61 and the front end of the table extension portion 5. The tilting fixing operation unit 71 can be rotated around an axis extending in the front-rear direction. The tilting fixing operation unit 71 has a concave-convex shape having a pattern different from the concave-convex shape of the grip portion 61 on the peripheral portion so that the user can easily grip and rotate it. Therefore, when the user grips it, the tilting fixing operation unit 71 and the grip unit 61 can be easily distinguished, and erroneous operation can be prevented.

As shown in FIG. 11, the transmission shaft 73 extends in the front-rear direction along the longitudinal direction of the table extension portion 5. The transmission shaft 73 extends to the lower part of the main body support arm 50. The front portion of the transmission shaft 73 is connected to the tilting fixing operation portion 71 by the reduction gear portion 72. The rotational power of the tilting fixing operation unit 71 is decelerated by the reduction gear unit 72 to rotate the transmission shaft 73 around the axis. A thrust needle bearing 74 and a receiving portion 75 are attached to the rear portion of the transmission shaft 73. The receiving portion 75 is fixed to the transmission shaft 73 in front of the thrust needle bearing 74. A nut 76 is attached to the rear end of the transmission shaft 73. The nut 76 is restricted from rotating about the transmission shaft 73 with respect to the main body support arm 50. The thrust needle bearing 74, the receiving portion 75, and the nut 76 are in a state of sandwiching the arm support portion 4b and the main body support arm 50 in the front-rear direction.

The nut 76 is fastened to the rear end of the transmission shaft 73 by rotating the transmission shaft 73 shown in FIG. 11 around the axis. As a result, the main body support arm 50 and the arm support portion 4b are pressed against each other in the front-rear direction by the axial force generated between the thrust needle bearing 74 and the receiving portion 75 and the nut 76. Thus, the main body support arm 50 is positioned with respect to the arm support portion 4b at a predetermined left-right tilt angle. When the transmission shaft 73 is rotated in the opposite direction, the nut 76 is loosened with respect to the transmission shaft 73. As a result, the axial force between the thrust needle bearing 74 and the receiving portion 75 and the nut 76 is released. Therefore, the main body support arm 50 can be tilted left and right with respect to the arm support portion 4b around the axis of the left-right tilt support shaft 50a (see FIG. 10).

As shown in FIG. 16, when the cutting machine main body 10 is tilted to the left, the cutting machine main body 10 has no protruding portion on the left side of the cutting tool 11 and around the lower portion of the cutting tool 11 (in the figure, the movable cover 13 is the cutting tool). It is located around the underside of 11, but is actually moving upwards). Therefore, the cutting machine main body 10 other than the cutting tool 11 does not hit the material to be cut, and inclined cutting can be preferably performed.

As shown in FIGS. 17 and 18, when the cutting machine main body 10 is tilted to the right, the motor housing 20, the gear housing 25, the controller housing 30, the handle portion 40, the slide bar 51, etc. are positioned above the positioning fence 6. do. In other words, when the cutting machine main body 10 is tilted to the right, it does not have a protruding portion to the right of the cutting tool 11 and around the lower portion of the cutting tool 11. Therefore, the cutting machine main body 10 other than the cutting tool 11 does not hit the material to be cut, and inclined cutting can be preferably performed.

As described above, the cutting machine 1 includes a long slide bar 51 extending in the front-rear direction as shown in FIGS. 5 and 6, and a slide base 17 mounted on the slide bar 51 and moving along the slide bar 51. And has a cutting machine main body 10 mounted on the slide base 17 so as to be movable in the vertical direction. The cutting machine main body 10 extends in the axial direction orthogonal to the slide bar 51 and slides with the cutting tool 11 when viewed from the front in a state where the output shaft 27 is rotated and the cutting tool 11 is vertical. An electric motor 21 located between the bars 51 is provided.

Therefore, the slide bar 51 and the electric motor 21 are arranged on the right side of the cutting tool 11. Therefore, the cutting machine 1 can be provided without having a structure that projects to the left side of the cutting tool 11. As a result, the visibility of the cut position of the cutting tool 11 on the left side of the cutting tool 11 can be improved.

As shown in FIG. 7, the electric motor 21 has a motor shaft 21a. The motor shaft 21a is tilted at 10 ° or less in parallel with or with respect to the side surface of the cutting tool 11 when viewed from the radial direction of the motor shaft 21a in a state where the cutting tool 11 is vertical. Therefore, the motor shaft 21a can be arranged in a posture along the side surface of the cutting tool 11. Therefore, the electric motor 21 can be arranged close to the cutting tool 11. As a result, the cutting tool 11 and the electric motor 21 are arranged compactly in the left-right direction. Thus, the cutting machine main body 10 can be made compact in the left-right direction.

As shown in FIG. 6, the center of the electric motor 21 is arranged at a position of 30 to 50% of the distance from the cutting tool 11 to the slide bar 51 in the direction perpendicular to the surface of the cutting tool 11 starting from the cutting tool 11. Therefore, the center of the electric motor 21 is arranged closer to the cutting tool 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 brought closer to the cutting tool 11. As a result, when the cutting machine main body 10 is moved downward to cut the cutting tool 11 into the material to be cut, the twisting moment due to the reaction force received by the cutting machine 11 from the material to be cut and the own weight of the cutting machine main body 10 can be reduced.

As shown in FIGS. 13, 15 and 19, the slide bar 51 has a plurality of bars 51a and 51b arranged side by side in the vertical direction. Specifically, the central axes of the first bar 51a and the second bar 51b are on the same plane. The plane on which the first bar 51a and the second bar 51b extend is a vertical plane. The second bar 51b has a larger diameter than the first bar 51a. The distance from the lower end of the first bar 51a to the upper end of the second bar 51b is larger than the diameter of the second bar 51b. At least one second bar 51b of the plurality of bars 51a and 51b is positioned so that the cutting machine main body 10 overlaps with the electric motor 21 when viewed in the axial direction at the bottom dead center. The fan 22 and the exhaust port 20b are located lower than the upper end of the second bar 51b. Further, the fan 22 and the exhaust port 20b are located at positions lower than the lower end of the second bar 51b. The switch lever 42 is located at a position lower than the lower end of the first bar 51a. The gripped portion of the carrying handle 44 is located higher than the upper end of the first bar 51a. Therefore, the electric motor 21 can be arranged at a low position when the cutting machine main body 10 is at bottom dead center. As a result, the amount of protrusion of the electric motor 21 upward is suppressed. This makes the cutting machine 1 compact. Further, when the cutting machine main body 10 is tilted in the left-right direction to cut into the material to be cut, it is possible to prevent the upper portion of the electric motor 21 from obstructing the visibility of the cut position.

As shown in FIG. 13, the second bar 51b is located at the lowest position among the plurality of bars 51a and 51b. Therefore, the electric motor 21 can be arranged near the lowest point where the electric motor 21 can be arranged. Therefore, the amount of upward protrusion of the electric motor 21 can be minimized. As a result, the cutting machine 1 can be suitably and compactly provided.

As shown in FIG. 13, the plurality of bars include a first bar 51a located at the uppermost position and a second bar 51b located at the lowermost position. The diameter 51e of the first bar 51a is a [mm], the diameter 51f of the second bar 51b is b [mm], the distance 51 g between the centers of the first bar 51a and the second bar 51b is c [mm], and the diameter of the cutting tool 11. When 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 bars 51a and 51b can be compactly accommodated within a length range shorter than half the diameter of the cutting tool 11 in the vertical direction. Moreover, the vertical distance including all of the plurality of bars 51a and 51b is larger than 2/7 times the diameter of the cutting tool 11. Therefore, a plurality of bars 51a and 51b can be provided so as to have sufficient strength to support the cutting machine main body 10. Thus, both the compactness of the slide structure of the cutting machine main body 10 and the supporting strength can be achieved at the same time.

As shown in FIG. 13, the cutting machine main body 10 is slid in the traveling direction with respect to the slide bar 51 when the cutting material is cut by the cutting tool 11. The electric motor 21 has a motor shaft 21a. The motor shaft 21a is oriented with an inclination angle that inclines upward toward the traveling direction when the cutting machine main body 10 is located at the bottom dead center. When the cutting machine main body 10 is located at the bottom dead center, the amount of downward protrusion of the electric motor 21 can be minimized. As a result, the cutting machine 1 can be made compact in the vertical direction.

As shown in FIG. 13, the inclination angle of the motor shaft 21a is 30 ° to 60 ° with respect to the horizontal line when the cutting machine main body 10 is located 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 material to be cut. Therefore, the material to be cut can be suitably cut by using the cutting machine 1 provided compactly.

As shown in FIG. 4, the motor shaft 21a has an inclination angle of 10 ° or less with respect to the horizontal line or parallel to the horizontal line when the cutting machine main body 10 is located at the top dead center. Therefore, the amount of protrusion of the electric motor 21 upward or downward can be suppressed. This makes it possible to prevent the visibility from being hindered when confirming the cutting position of the cutting tool 11.

As shown in FIGS. 5 and 6, the cutting machine 1 has an operation handle 41 used for moving the cutting machine main body 10 with respect to the slide bar 51. 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 when viewed from the front in a state where the cutting tool 11 is vertical. Further, the left-right center surface of the operation handle 41 and the left-right center surface of the battery mounting portion 32 are flush with each other. The motor shaft 21a (see FIG. 4) is located on the same plane as the center surface of the operation handle 41 in the left-right direction.

Therefore, the center 41a of the slide bar 51 and the operation handle 41 can be brought closer to each other in the left-right direction. Therefore, when the user grips the operation handle 41 and cuts the cutting tool 11 into the material to be cut, the twisting moment of the cutting machine main body 10 with respect to the slide bar 51 can be reduced. Further, the cutting tool 11 and the center 41a of the operation handle 41 can be brought closer to each other in the left-right direction. Therefore, when the user grips the operation handle 41 and cuts the cutting tool 11 into the material to be cut, the twisting moment due to the reaction force received by the cutting tool 11 from the material to be cut and the operating force for operating the operation handle 41 can be reduced. .. The distance from the center of the operation handle 41 (battery mounting portion 32, motor shaft 21a) to the cutting tool 11 in the direction perpendicular to the surface of the cutting tool 11 is the center 51c (or the center of the second bar 51b) of the first bar 51a. It is desirable that the distance is shorter than the distance to 51d).

As shown in FIG. 6, the center 41a of the operation handle 41 is arranged at a position of 30 to 70% of the distance from the cutting tool 11 to the slide bar 51 in the direction perpendicular to the surface of the cutting tool 11 starting from the cutting tool 11. Therefore, the center 41a of the operation handle 41 is arranged at a position not too far from both the cutting tool 11 and the slide bar 51. Therefore, the twisting moment of the cutting machine main body 10 acting between the cutting tool 11 and the operation handle 41 can be reduced. Moreover, the bending of the slide bar 51 due to the operating force for operating the operation handle 41 can be suppressed.

As shown in FIGS. 1 and 6, the cutting machine 1 has a bottom dead center stopper 19 that restricts the cutting machine main body 10 from moving below the bottom dead center. The center 19c of the bottom dead center stopper 19 is located between the slide bar 51 and the cutting tool 11 when viewed from the front in a state where the cutting tool 11 is vertical. Therefore, the distance between the center 19c of the bottom dead center stopper 19 and the slide bar 51 can be shortened. The bottom dead center stopper 19 receives a reaction force when the cutting machine main body 10 descends to the bottom dead center. Therefore, by shortening the distance, the twisting moment of the cutting machine main body 10 with respect to the slide bar 51 due to the reaction force can be reduced.

As shown in FIG. 6, the center 19c of the bottom dead center stopper 19 is arranged at a position of 30 to 70% of the distance from the cutting tool 11 to the slide bar 51 in the direction perpendicular to the surface of the cutting tool 11 starting from the cutting tool 11. Therefore, the center 19c of the bottom dead center stopper 19 is arranged at a position not too far from both the cutting tool 11 and the slide bar 51. Therefore, the twisting moment of the cutting machine main body 10 acting between the reaction force received by the bottom dead center stopper 19 and the slide bar 51 can be reduced, and the shake of the cutting tool 11 due to the twisting moment can be suppressed.

As shown in FIGS. 2, 5 and 6, the cutting machine 1 has an operation handle 41 used for moving the cutting machine main body 10 with respect to the slide bar 51. The cutting machine 1 has a movable cover 13 that covers a part of the cutting tool 11 and is movable with respect to the cutting machine main body 10. The cutting machine 1 has a carrying handle 44 that is used when carrying the cutting machine 1 and has a configuration 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 arranged compactly so as not to interfere with the visibility of the cut position, and can be arranged so as not to interfere with the operation of the movable cover 13.

As shown in FIGS. 7 and 8, the cutting machine 1 has an intermediate shaft 26 and an output shaft 27 that extend orthogonally to the motor shaft 21a of the electric motor 21 and are arranged in the power transmission path from the motor shaft 21a to the cutting tool 11. .. The cutting machine 1 has gears (drive side bevel gear 21e, driven side bevel gear 26a, reduction gears 26b, 27a) attached to the motor shaft 21a or the intermediate shaft 26 or the output shaft 27, and a gear housing 25 accommodating the gears. The gear housing 25 has a first opening 25a through which the motor shaft 21a penetrates, and a second opening 25b that opens in a direction intersecting the opening direction of the first opening 25a and through which the intermediate shaft 26 penetrates. The gear housing 25 is composed of one component. Therefore, the gear housing 25 accommodates at least a part of the motor shaft 21a extending in different directions, at least a part of the intermediate shaft 26, and the gear, and is formed compactly. As a result, the cutting machine main body 10 can be made compact in the left-right direction and the front-back direction. Further, the strength of the gear housing 25 can be increased by being composed of one component.

As shown in FIGS. 7 and 8, the gear housing 25 supports a set of gears connecting the motor shaft 21a and the intermediate shaft 26, and the set of gears is a drive side bevel gear 21e and a driven side bevel gear 26a. Therefore, power can be transmitted by a set of drive-side bevel gears 21e and driven-side bevel gears 26a from the motor shaft 21a extending in the front-rear direction to the intermediate shaft 26 extending in the left-right direction. Therefore, the gear housing 25 that supports 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.

As shown in FIG. 13, 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 located at the bottom dead center. Therefore, the controller 31 can be arranged so that the cutting machine main body 10 is compact in the left-right direction. Further, the amount of protrusion of the controller 31 downward can be suppressed. Therefore, it is possible to prevent the controller housing 30 accommodating the controller 31 from coming into contact with the material to be cut when the cutting machine main body 10 is located at the bottom dead center.

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

As shown in FIGS. 7 and 9, the cutting machine 1 has a fan 22 that is rotated by the electric motor 21 to generate wind that cools the electric motor 21, and a controller 31 that controls the output of the electric motor 21. The controller 31 is cooled by utilizing the wind generated by the fan 22. Therefore, both the electric motor 21 and the controller 31 can be efficiently cooled by using the fan 22.

The cutting machine (desktop cutting machine) 80 of the second embodiment of the present disclosure will be described with reference to FIGS. 21 to 23. The cutting machine 80 includes a rectangular box-shaped controller housing 81 whose longitudinal direction is the left-right direction, instead of the controller housing 30 of the cutting machine 1 of the first embodiment shown in FIG. In the following description, only the configuration different from the first embodiment will be described in detail. The carrying handle 44 is omitted in FIGS. 21 to 23.

The controller housing 81 shown in FIGS. 21 and 22 contains a controller 82 provided in the same manner as the controller 31 (see FIG. 10). The controller 82 is housed in the controller housing 81 in a posture in which the longitudinal direction of the shallow rectangular parallelepiped case is along the left-right direction and the thickness direction (the direction in which the shortest side of the case extends) is along the front-rear direction. The controller housing 81 is connected to the motor housing 20 in the front-rear direction via a rectangular columnar cross-linking portion 83 extending in the front-rear direction. The inside of the cross-linking portion 83 is provided hollowly to communicate the controller housing 81 and the motor housing 20. An intake port (not shown) is provided on the side surface of the controller housing 81. When the electric motor 21 is started and the fan 22 (see FIG. 7) rotates, a negative pressure is generated in the communication portion between the bridge portion 83 and the motor housing 20 due to the cooling air flowing inside the motor housing 20. As a result, cooling air flows from the intake port of the controller housing 81 toward the inside of the controller housing 81 and the inside of the bridge portion 83. Thus, the controller 82 housed in the controller housing 81 is cooled.

As shown in FIGS. 21 and 22, a battery mounting portion 84 is provided at the rear portion of the controller housing 81. The mounting surface of the battery mounting portion 84 faces rearward. A substantially rectangular box-shaped battery 33 can be mounted on the battery mounting portion 84 by sliding it from the left side to the right side (slide bar 51 side). Further, the battery 33 can be removed from the battery mounting portion 84 by sliding it from the right side to the left side. As shown in FIG. 23, the main body support arm 50 does not come into contact with the cutting machine main body 10 or the battery 33 attached to the battery mounting portion 84 (see FIG. 21) when the cutting machine main body 10 is moved backward. The cutting tool 11 has a shape that is inclined to the right as it goes upward in a vertical state.

The cutting machine (desktop cutting machine) 90 of the third embodiment of the present disclosure will be described with reference to FIGS. 24 to 28. The cutting machine 90 includes a cutting machine main body 91 instead of the cutting machine main body 10 of the cutting machine 1 of the first embodiment shown in FIG. In the following description, only the configuration different from the first embodiment will be described in detail. The cutting machine main body 91 can swing up and down about the vertical swing support shaft 91a, and FIGS. 24 to 28 show a state where the cutting machine main body 91 is located at the bottom dead center. Further, the configurations other than the cutting machine main body 91 are omitted.

As shown in FIG. 24, the cutting machine main body 91 has a motor housing 92 for accommodating the electric motor 21. The motor housing 92 has a substantially cylindrical shape extending in the front-rear direction. The motor housing 92 is arranged 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 overlaps with the second bar 51b in a side view with the cutting machine main body 10 located at the bottom dead center and the cutting tool 11 (see FIG. 13) vertical. It is a position to do. The electric motor 21 is housed so that the motor shaft 21a is along the longitudinal direction of the substantially cylindrical motor housing 20.

As shown in FIGS. 27 and 28, an intake port 92a capable of taking in outside air is provided on the rear surface of the motor housing 92 in the extending direction of the motor shaft 21a. An overhanging portion 92b overhanging outward in the radial direction is provided at the lower portion of the front end of the motor housing 92. The overhanging 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 tubular overhanging portion 92b is used as the exhaust port 92c of the motor housing 92. The exhaust port 92c is provided at substantially the same front-rear position as the front end of the stator 21b on the radial outer side of the electric motor 21.

As shown in FIG. 27, the gear housing 93 is connected to the front portion of the motor housing 92 in the extending direction of the motor shaft 21a. The gear housing 93 is also connected to the right side surface of the fixed cover 12. A first opening 93a that opens toward the opposite gear side in the motor axial direction is provided at the rear portion of the gear housing 93 in the extending direction of the motor shaft 21a. The first opening 93a has an in-row coupling with the motor housing 92.

The outer ring of the first bearing 28a, which rotatably supports the rear end of the motor shaft 21a, is press-fitted into the hole 92f recessed in the rear portion of the motor housing 92. The outer ring of the second bearing 28b, which rotatably supports the front end of the motor shaft 21a, is press-fitted into the hole portion 93b recessed in the gear housing 93. On the inner peripheral side of the gear housing 93, an inner peripheral front end surface 93e located in front of the fan 22 and extending substantially orthogonal to the motor shaft 21a is provided.

As shown in FIG. 27, an overhanging portion 93c overhanging outward in the radial direction is provided at the lower part of the front end of the gear housing 93. On the inner peripheral side of the overhanging portion 93c, a curved surface 93d that is smoothly connected to the radial outer peripheral end of the inner peripheral front end surface 93e is provided. The curved surface 93d extends rearward while being arcuate outward in the radial direction of the gear housing 93. The rear end of the curved surface 93d is smoothly connected to the inner peripheral surface of the overhanging portion 92b of the motor housing 92. Therefore, a ventilation path that is smoothly connected from the inner peripheral front end surface 93e to the exhaust port 92c is formed.

FIG. 27 shows the flow of cooling air for cooling the electric motor 21. As shown by the black arrows in the figure, when the fan 22 attached to the front portion of the motor shaft 21a rotates, cooling air is introduced into the motor housing 20 from the intake port 92a. The cooling air in the motor housing 20 flows toward the front fan 22 along the extending direction of the motor shaft 21a. The cooling air in the gear housing 93 is bent outward in the radial direction of the fan 22 and flows toward the inner peripheral portion of the overhanging portion 93c along the inner peripheral front end surface 93e. The cooling air flows along the curved surface 93d along the extending direction of the motor shaft 21a toward the rear exhaust port 92c. The exhaust air discharged from the exhaust port 92c is discharged in a direction parallel to and opposite to the wind direction of the cooling air in the motor housing 92.

As shown in FIG. 28, the exhaust port 92c is provided with a plurality of ribs 92d extending in the vertical direction and partitioning the opening surface to the left and right. The exhaust air discharged from the exhaust port 92c is rectified by the plurality of ribs 92d. As a result, the wind direction of the exhaust air is aligned in the direction toward the rear along the extending direction of the motor shaft 21a.

As shown in FIGS. 24 and 27, a boss 92g protruding outward in the radial direction is provided at the lower portion of the motor housing 92. The boss 92g is provided with a circular fitting hole 92e that penetrates in the left-right direction. On the right side surface of the fixed cover 12, a columnar fitting pin 91b extending in the left-right direction is provided. The fitting pin 91b is provided with a diameter that can be inserted into the fitting hole 92e by gap fitting. The fitting pin 91b is provided at a position farther from the rotation center of the cutting tool 11 (see FIG. 13) than the gear housing 93 screwed to the fixing cover 12. When assembling the motor housing 92 and the gear housing 93 to the fixed cover 12, the fitting pin 91b is inserted into the fitting hole 92e. As a result, the motor housing 92 is positioned with respect to the fixed cover 12. By providing the fitting pin 91b at a position away from the rotation center of the cutting tool 11, it is possible to suppress the vertical rotation of the motor housing 92 with respect to the fixed cover 12.

As shown in FIGS. 25 and 26, a second bottom dead center stopper 94 is provided on the rear left side of the fixed cover 12. The second bottom dead center stopper 94 is a male screw shape extending in the vertical direction, and is a hexagon socket head cap screw with the head facing upward. A synthetic resin for preventing loosening is applied to the male thread portion of the second bottom dead center stopper 94. The second bottom dead center stopper 94 prevents the cutting machine main body 91 from moving downward below the second bottom dead center. The second bottom dead center is set at a position higher than the bottom dead center of the cutting machine main body 91 set by the bottom dead center stopper 19. The second bottom dead center is set at a height at which the lower end of the cutting tool 11 coincides with the height of the table upper surface 4a or a height at which the lower end of the cutting tool 11 is located slightly below the table upper surface 4a. Therefore, when it is moved down to the second bottom dead center, the distance from the lower end of the outer flange 15 to the table upper surface 4a becomes long. As a result, the cutting depth at which the cutting tool 11 can be cut into the material to be cut can be increased, so that a thick material to be cut can be cut using a batten. The height of the second bottom dead center can be adjusted by rotating the second bottom dead center stopper 94. The adjustment of the height of the second bottom dead center is mainly performed in the production process of the product. To adjust the height of the second bottom dead center, it is necessary to rotate the second bottom dead center stopper 94 against the frictional force of the synthetic resin for preventing loosening. Therefore, the torque is too large to operate by hand, so it is done with a hex wrench.

As shown in FIGS. 25 and 26, a release lever 95 is provided adjacent to the second bottom dead center stopper 94 on the rear left side of the fixed cover 12. The release lever 95 is connected to the slide base 17 so as to be tiltable in the left-right direction with the rear end as the center. The release lever 95 can tilt about the tilting support shaft 97 between the initial position extending in the front-rear direction following the fixed cover 12 and the release position where the front end is separated to the left from the fixed cover 12. .. The upper surface of the release lever 95 is provided with a first recess into which the lower end of the second bottom dead center stopper 94 can enter. The lower end of the second bottom dead center stopper 94 can enter the first recess from above when the release lever 95 is located at the initial position. Therefore, when the release lever 95 is located at the initial position, in the cutting machine main body 91, the lower end of the second bottom dead center stopper 94 enters the first recess and the bottom dead center stopper 19 enters the bottom dead center stopper contact portion 17a. It can be lowered to the bottom dead center where it abuts (see FIG. 19). When the release lever 95 is located at the release position, the lower end of the second bottom dead center stopper 94 cannot enter the first recess of the release lever 95 and comes into contact with the upper surface of the release lever 95. Therefore, when the release lever 95 is located at the release position, the bottom dead center of the cutting machine main body 91 is set to the second bottom dead center at a position higher than the bottom dead center set by the bottom dead center stopper 19.

As shown in FIGS. 25 and 26, a grooving depth adjusting screw 96 is provided on the left side of the rear portion of the fixing cover 12. The grooving depth adjusting screw 96 is arranged in front of the second bottom dead center stopper 94. The grooving depth adjusting screw 96 has a male screw shape extending in the vertical direction. The grooving depth adjusting screw 96 is connected to the fixing cover 12 in a screw structure so as to be movable in the vertical direction. By rotating the grooving depth adjusting screw 96, the height of the lower end of the grooving depth adjusting screw 96 with respect to the fixing cover 12 moves up and down. The upper surface of the release lever 95 is provided with a second recess into which the lower end of the grooving depth adjusting screw 96 can enter. The lower end of the grooving depth adjusting screw 96 can enter the second recess from above when the release lever 95 is located at the initial position, and cannot enter the second recess when the release lever 95 is located at the release position. Is. Therefore, when the release lever 95 is located at the initial position, in the cutting machine main body 91, the lower end of the grooving depth adjusting screw 96 enters the second recess and the bottom dead center stopper 19 enters the bottom dead center stopper contact portion 17a. It can be lowered to the bottom dead center where it abuts (see FIG. 19). When the release lever 95 is located at the release position, the bottom dead center of the cutting machine main body 91 is higher than the bottom dead center set by the bottom dead center stopper 19, and the grooving depth is adjusted by the user's operation. It becomes a predetermined height (a position higher than the second bottom dead center) set by the screw 96. For example, a knurl is formed on the head of the grooving depth adjusting screw 96. Further, the male thread portion of the grooving depth adjusting screw 96 is not provided with, for example, a synthetic resin for preventing loosening. Therefore, the grooving depth adjusting screw 96 can be rotated and operated by hand. A hexagonal hole is formed in the end surface of the head of the grooving depth adjusting screw 96. Therefore, it can be rotated with a wrench with a hexagonal hole.

As described above, 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 toward the rear as shown in FIG. 27. 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 located in front of the cutting machine 90. Therefore, it is possible to suppress the scattering of chips toward the user. Further, when the cutting machine main body 91 is tilted in the left-right direction to perform tilt cutting, it is possible to suppress the exhaust air from being discharged toward the material to be cut located below the electric motor 21. Therefore, it is possible to prevent chips from being rolled up on the material to be cut.

As shown in FIG. 27, the exhaust air discharged from the exhaust port 92c flows in parallel and in the opposite direction to the cooling air that is cooling the electric motor 21. Therefore, the intake port 92a is arranged behind the electric motor 21. Therefore, it is possible to prevent chips floating in the vicinity of the intake port 92a from being sucked into the intake port 92a. Moreover, the exhaust air flows along the extending direction of the motor shaft 21a of the electric motor 21, and flows in parallel and in the opposite direction to the cooling air. Therefore, the exhaust air is discharged so as not to be separated from the motor housing 92 accommodating the electric motor 21 in the vertical direction or the horizontal direction. This makes it possible to further suppress the scattering of chips on the material to be cut.

Various changes can be made to the cutting machine 1 of the present embodiment described above. The cutting machine main body 10 is supported so as to be movable in the front-rear direction by a slide bar 51 attached to the main body support arm 50. The main body support arm 50 is tiltably supported with respect to the arm support portion 4b of the turntable 4. Instead of this, the main body support arm 50 may be configured to be directly supported by the base 2 or the mounting surface. Even for a desktop cutting machine that does not have a left-right tilt angle adjustment mechanism that allows the cutting machine body 10 to tilt in the left-right direction, or a miter angle adjustment mechanism that allows the turntable 4 to rotate horizontally with respect to the base 2. Can be applied.

The cutting machine main body 10 may be arranged in the left-right direction in reverse from the present disclosure. That is, the cutting tool 11 is arranged on the right side, the slide bar 51 is arranged on the left side, and the electric motor 21, the battery mounting portion 32, the handle portion 40, and the like are arranged between the cutting tool 11 and the slide bar 51 in the left-right direction. Is also good.

Although the slide bar 51 including the two bars 51a and 51b is illustrated, the number of bars may be one or three or more bars arranged side by side. The slide bar 51 may be non-parallel to the side surface of the cutting tool 11. The slide bar 51 may be non-parallel to the horizon.

The arrangement of the controller 31 is not limited to the example, and may be arranged above the electric motor 21 in a posture in which the longitudinal direction is along the motor shaft 21a and the thickness direction is the radial direction of the electric motor 21.

The configuration in which the exhaust port 92c is provided in the cutting machine 90 at substantially the same front-rear position as the front end of the stator 21b outside the radial direction of the electric motor 21 is illustrated. Instead of this, for example, the exhaust port 92c may be arranged in front of the stator 21b of the electric motor 21. For example, the exhaust port 92c of the cutting machine 90 may be provided at the rear end of the overhanging portion 93c of the gear housing 93, and the overhanging portion 92b may not be provided in the motor housing 92.

1 ... Cutting machine (desktop cutting machine)
2 ... Base, 2a ... Rotating support shaft, 2b ... Horizontal plate part 3 ... Auxiliary table 4 ... Turntable, 4a ... Table top surface, 4b ... Arm support part 4c ... Inclined stopper bolt 5 ... Table extension part, 5a ... Cutting edge plate 5, 5b ... Groove hole 6 ... Positioning fence, 6a ... Positioning surface 7 ... Miter scale plate, 7a ... Fixing screw, 7b ... Positioning recess 10 ... Cutting machine body 10a ... Vertical swing support shaft 11 ... Cutting tool 12 ... Fixed cover, 12a ... Arrow, 12b ... Hole 13 ... Movable cover 14 ... Fixing screw 15 ... Outer flange 16 ... Inner flange 17 ... Slide base, 17a ... Bottom dead point stopper contact part, 17b ... Top dead point stopper contact part 18 ... Dust collection guide, 18a ... Dust discharge port 19 ... Bottom dead point stopper, 19a ... Projection, 19b ... Bolt, 19c ... Center 20 ... Motor housing, 20a ... Intake port, 20b ... Exhaust port, 20c ... Hole 21 ... Electric Motor, 21a ... Motor shaft, 21b ... Steader, 21c ... Rotor 21d ... Sensor board, 21e ... Drive side bevel gear 22 ... Fan 23 ... Top dead point stopper 25 ... Gear housing, 25a ... First opening, 25b ... Second Openings 25c, 25d ... Hole 26 ... Intermediate shaft (power transmission shaft), 26a ... Driven side bevel gear, 26b ... Reduction gear 26c ... Key, 26d ... Washer, 26e ... Rubber ring, 26f ... Washer 26g ... Wheel stop 27 ... Output Shaft (power transmission shaft), 27a ... Reduction gear 28a ... 1st bearing, 28b ... 2nd bearing, 28c ... 3rd bearing, 28d ... 4th bearing 28e ... 5th bearing, 28f ... 6th bearing 29 ... Bearing box, 29a, 29b ... Hole 30 ... Controller housing, 30a ... Intake port, 30b ... Communication port 31 ... Controller 32 ... Battery mounting part 33 ... Battery 34 ... Rubber pin 35 ... Urethane washer 36 ... Rubber ring 37 ... Washer 38 ... Bottom dead point Lock pin 40 ... Handle part 41 ... Operation handle, 41a ... Center 42 ... Switch lever 43 ... Lock-off button 44 ... Carrying handle, 44a ... First connecting part, 44b ... Second connecting part 45 ... Switch (for laser irradiator)
46 ... Switch (for lighting equipment)
47 ... Laser irradiator 48 ... Illuminator, 48a ... Arm 49 ... Communication adapter 50 ... Main body support arm, 50a ... Left / right tilting support shaft 51 ... Slide bar, 51a ... First bar, 51b ... Second bar, 51c, 51d ... Center 51e, 51f ... Diameter, 51g ... Center distance 52 ... Maximum tilt angle switching lever, 52a ... Lever shaft, 52b ... Width across flats 60 ... Turntable fixing mechanism 61 ... Grip part 62 ... Fixed rod 63 ... Sandwiching member, 63a ... Rotating shaft, 63b ... Sandwiching part 65 ... Positive lock mechanism 66 ... Unlocking lever, 66a ... Positioning pin, 66b ... Engagement pin, 66c ... Compression spring 67 ... Pin support part 68 ... Adjust bolt 70 ... Tilt fixing mechanism 71 ... Tilt fixing operation unit 72 ... Reduction gear unit 73 ... Transmission shaft 74 ... Thrust needle bearing 75 ... Receiving part 76 ... Nut 80 ... Cutting machine (desktop cutting machine)
81 ... Controller housing 82 ... Controller 83 ... Cross-linking part 84 ... Battery mounting part 90 ... Cutting machine (desktop cutting machine)
91 ... Cutting machine body, 91a ... Vertical swing support shaft, 91b ... Fitting pin 92 ... Motor housing, 92a ... Intake port, 92b ... Overhanging part, 92c ... Exhaust port 92d ... Rib, 92e ... Fitting hole, 92f ... Hole, 92 g ... Boss 93 ... Gear housing, 93a ... First opening, 93b ... Hole, 93c ... Overhanging portion 93d ... Curved surface, 93e ... Inner circumference front end surface 94 ... Second bottom dead center stopper 95 ... Release Lever 96 ... Grooving depth adjusting screw 97 ... Tilt support shaft S1 ... First virtual plane S2 ... Second virtual plane

Claims (21)

It ’s a desktop cutting machine,
A long slide bar that extends in the front-back direction,
A slide base that is attached to the slide bar and moves along the slide bar,
It has a cutting machine body that is mounted on the slide base so that it can be moved up and down.
The cutting machine body
An output shaft that extends in the axial direction orthogonal to the slide bar and to which a cutting tool is attached,
A desktop cutting machine including an electric motor located between the cutting tool and the slide bar when the output shaft is rotated and the cutting tool is vertical when viewed from the front. The desktop cutting machine according to claim 1.
The electric motor has a motor shaft and has a motor shaft.
The motor shaft is a desktop cutting machine that is parallel to the side surface of the cutting tool or tilted at 10 ° or less with respect to the side surface when the cutting tool is vertical when viewed from the radial direction of the motor shaft. The desktop cutting machine according to claim 1 or 2.
The center of the electric motor is a tabletop cutting machine arranged at a position of 30 to 50% of the distance from the cutting tool to the slide bar in the direction perpendicular to the surface of the cutting tool starting from the cutting tool. The desktop cutting machine according to any one of claims 1 to 3.
The slide bar has one bar or a plurality of bars arranged side by side.
The one bar or at least one bar of the plurality of bars is a tabletop cutting machine located so that the cutting machine main body overlaps with the electric motor when viewed in the axial direction at the bottom dead center. The desktop cutting machine according to claim 4.
The at least one bar is a tabletop cutting machine located at the lowest position among the plurality of bars. The desktop cutting machine according to claim 4 or 5.
The plurality of bars include a first bar located at the uppermost position and a second bar located at the lowermost position.
The diameter of the first bar is a [mm], the diameter of the second bar is b [mm], the distance between the center of the first bar and the second bar is c [mm], and the diameter of the cutting tool is d [. When [mm] is set,
(A / 2 + b / 2 + c) x 2 <d <(a / 2 + b / 2 + c) x 3.5
Desktop cutting machine that meets the relationship of. The desktop cutting machine according to any one of claims 1 to 4.
The cutting machine main body is slid in the traveling direction with respect to the slide bar when cutting the material to be cut by the cutting tool.
The electric motor has a motor shaft and has a motor shaft.
The motor shaft is a desktop cutting machine that is oriented with an inclination angle that inclines upward toward the traveling direction when the cutting machine main body is located at the bottom dead center. The desktop cutting machine according to claim 7.
A tabletop cutting machine in which the inclination angle of the motor shaft is 30 ° to 60 ° with respect to the horizon. The desktop cutting machine according to claim 7 or 8.
The motor shaft is a desktop cutting machine having the inclination angle of 10 ° or less parallel to the horizontal line or with respect to the horizontal line when the cutting machine main body is located at the top dead center. The desktop cutting machine according to any one of claims 1 to 9.
It has an operation handle used to move the cutting machine body with respect to the slide bar.
The center of the operation handle is a tabletop cutting machine located on a virtual plane including the cutting tool or between the slide bar and the cutting tool when viewed from the front in a state where the cutting tool is vertical. The desktop cutting machine according to claim 10.
The center of the operation handle is a tabletop cutting machine 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 surface of the cutting tool starting from the cutting tool. The desktop cutting machine according to any one of claims 1 to 11.
It has a bottom dead center stopper that regulates the movement of the cutting machine body below the bottom dead center.
The center of the bottom dead center stopper is a tabletop cutting machine located between the slide bar and the cutting tool when viewed from the front in a state where the cutting tool is vertical. The desktop cutting machine according to claim 12.
The center of the bottom dead center stopper is a tabletop cutting machine 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 surface of the cutting tool starting from the cutting tool. The desktop cutting machine according to any one of claims 1 to 13.
An operation handle used to move the cutting machine body with respect to the slide bar,
A movable cover that covers a part of the cutting tool and is movable with respect to the cutting machine body,
It is used when carrying a desktop cutting machine and has a carrying handle different from the operation handle.
The carrying handle is a desktop cutting machine that extends across the movable area of the movable cover. The desktop cutting machine according to any one of claims 1 to 14.
A power transmission shaft extending in a direction intersecting the motor shaft of the electric motor and arranged in a power transmission path from the motor shaft to the cutting tool, a gear attached to the motor shaft or the power transmission shaft, and the gear. Has a gear housing that houses
The gear housing has a first opening through which the motor shaft penetrates and a second opening through which the power transmission shaft penetrates and which opens in a direction intersecting the opening direction of the first opening. Is a desktop cutting machine consisting of one part. The desktop cutting machine according to claim 15.
The gear housing supports a set of the gears connecting the motor shaft and the power transmission shaft, and the set of gears is a tabletop cutting machine which is a bevel gear. The desktop cutting machine according to any one of claims 1 to 16.
The cutting machine main body has an exhaust port which is arranged in the same front-rear position as the electric motor or is arranged in front of the electric motor and opens toward the rear, and exhaust air after cooling the electric motor from the exhaust port. A desktop cutting machine that discharges. The desktop cutting machine according to claim 17.
The exhaust air discharged from the exhaust port is a desktop cutting machine that flows in parallel and in the opposite direction to the cooling air that is cooling the electric motor. The desktop cutting machine according to any one of claims 1 to 18.
It has a controller that controls the output of the electric motor, and has a controller.
The controller is a desktop cutting machine located above the electric motor when the cutting machine main body is located at the bottom dead center. The desktop cutting machine according to any one of claims 1 to 19.
It has a controller that controls the output of the electric motor, and has a controller.
The controller is a desktop cutting machine that overlaps with the electric motor in the left-right direction when the cutting machine main body is located at the bottom dead center. The desktop cutting machine according to any one of claims 1 to 20.
It has a fan that is rotated by the electric motor to generate wind that cools the electric motor, and a controller that controls the output of the electric motor.
The controller is a desktop cutting machine that is cooled by using the wind generated by the fan.

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