JP2023180354A - Table cutter - Google Patents

Abstract

To provide a table cutter in which a support arm is allowed to be arranged largely in a longitudinal direction as excellently keeping cutting performance of products and compactness.SOLUTION: A table cutter 1 has a turn table 4 on which a material to be cut is placed. The table cutter 1 has a support arm 40 positioned at a rear side of the turn table 4 and standing upward from the turn table 4. The table cutter 1 has a slide bar 47 supported with the support arm 40 and extending in a longitudinal direction. The table cutter 1 has a swing support member 50 attached on the slide bar 47 and moving in an extending direction of the slide bar 47. The table cutter 1 has a cutter body 10 supported swingably in a vertical direction with the swing support member 50 and rotatably supporting a blade tool 11 in a disk-like shape. The support arm 40 has a front part 40c overlapping with the swing support member 50 in a side view when the swing support member 50 is positioned at the rearmost.SELECTED DRAWING: Figure 3

Description

The present invention relates to a table-top cutting machine used for cutting materials to be cut, such as wood.

This type of tabletop cutting machine includes, for example, a table on which the material to be cut is placed, a slide bar that extends forward and backward above the table, and a swinging support that is attached to the slide bar and is movable along the slide bar. It has a member. The cutting machine main body is attached to the swing support member so as to be swingable in the vertical direction. The cutting machine main body includes an electric motor and a substantially disc-shaped cutting tool that rotates using the electric motor as a power source. The side of the cutting tool is parallel to the slide bar. The cutting tool is rotated to move the cutting machine body downward toward the material to be cut placed on the base below. This causes the cutting tool to cut into the material to be cut. Furthermore, the cutting machine main body is moved along the extending direction of the slide bar together with the swing support member. This causes the cutting tool to move horizontally relative to the material to be cut. Thereby, the material to be cut can be cut along the extending direction of the slide bar.

The slide bar is disposed 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 a user located on the front side of the bench cutting machine so as not to obstruct movement of the cutting tool. The invention described in Patent Document 1 has a slide bar extending along the side surface of the cutting tool on the right side of the cutting tool. The invention described in Patent Document 2 has a slide bar extending along the side surface of the cutting tool on the left side of the cutting tool.

The slide bar is supported by a support arm that stands up behind the cutting machine body. If the support arm interferes with the swinging support member that has moved backward, the cutting ability of the bench cutter will be reduced. Therefore, the conventional support arm has a flat front portion so as not to interfere with the swing support member. In addition, conventional support arms have been kept compact in length in the front and back of the entire product.

By providing a large support arm in the front-back direction, it is possible to stably support the cutting machine body that swings in the vertical direction. This improves the stability and accuracy of cutting the cutting tool into the material to be cut. However, in conventional tabletop cutting machines, the size of the support arm in the front and back direction is limited in consideration of the cutting ability and compactness of the product as described above.

Japanese Patent Application Publication No. 2020-163813 JP 2021-24046 Publication

Therefore, there is a need for a table-top cutting machine that can provide a large support arm in the front and back direction while maintaining good product cutting ability and compactness.

According to one feature of the present disclosure, a bench cutter includes a table on which a material to be cut is placed. A bench cutter has a support arm located behind the table and rising upward from the table. The bench cutter has a slide bar supported by a support arm and extending in the front and rear direction. The desktop cutting machine has a swing support member that is attached to a slide bar and moves in the direction in which the slide bar extends. The desktop cutting machine includes a cutting machine main body that is vertically swingably supported by a swinging support member and rotatably supports a disc-shaped cutting tool. The support arm has a front portion that overlaps the swing support member in a side view when the swing support member is located at the rearmost position.

Therefore, when moving the swing support member to the rearmost position, the front portion of the support arm and the swing support member overlap in the front-rear direction. Therefore, the longitudinal length of the support arm can be increased without reducing the cutting capacity of the bench cutter. Furthermore, the longitudinal length of the support arm can be increased without enlarging the rear portion of the support arm. As a result, the support arm can be provided to be large in the front-rear direction while maintaining the compactness of the table-top cutting machine.

FIG. 1 is an overall perspective view of a table-top cutting machine according to an embodiment of the present disclosure, viewed from the left. FIG. 2 is an overall perspective view of the desktop cutting machine seen from the right side. FIG. 3 is a left side view of the table-top cutting machine with the cutting machine main body positioned at the top dead center and at the frontmost position. FIG. 3 is a top view of the table-top cutting machine with the cutting machine main body positioned at the top dead center and at the forefront. FIG. 2 is a left side view of the table-top cutting machine with the cutting machine main body positioned at the top dead center and rearmost position. FIG. 2 is a right side view of the table-top cutting machine with the cutting machine main body positioned at the top dead center and rearmost position. FIG. 3 is a top view of the table-top cutting machine with the cutting machine main body located at the top dead center and rearmost position. FIG. 2 is a front view of the table-top cutting machine with the cutting machine body located at the top dead center. FIG. 3 is a front view of the table-top cutting machine in a state where the cutting machine main body is tilted to the left and is located at the bottom dead center. FIG. 3 is a rear view of the table-top cutting machine with the cutting machine main body located at the top dead center. FIG. 7 is a cross-sectional view taken along the line XI-XI in FIG. 6, and is a cross-sectional view of the cutting machine main body. FIG. 6 is a cross-sectional view taken along the line XII-XII in FIG. 5, and is a cross-sectional view of the cutting machine main body, the swing support member, and the support arm. FIG. 2 is a bottom view including a partial cross section of the bench cutter excluding the base. FIG. 3 is a front view of the support arm.

According to another feature of the present disclosure, the support arm has an overlapping region that overlaps the swinging support member in a front view. The support arm has a non-overlapping region that does not overlap the swing support member. The front portion of the support arm has a convex portion that projects more forward than the overlap region in the non-overlap region. Therefore, the support arm and the swing support member overlap in the left and right direction when viewed from the front. Therefore, it is possible to suppress the support arm from increasing in size in the left-right direction. In addition, by providing the convex portion projecting forward from the support arm in the non-overlapping region, it is possible to ensure a long longitudinal length of the support arm.

According to other features of the disclosure, the support arm has a lower portion connected to the table. The support arm has an upper portion located more rearward than the lower portion. The support arm has an intermediate portion that connects the lower portion and the upper portion and slopes upward and rearward. The convex portion is a protrusion that extends forward and up and down from the intermediate portion. Therefore, the rigidity of the intermediate portion can be improved by the convex portion. Therefore, the rigidity in the front-rear direction can be improved between the lower part connected to the front part of the intermediate part and the upper part connected to the rear part of the intermediate part. Furthermore, by making the convex portion protrude forward from the intermediate portion, it is possible to suppress the entire product from increasing rearward.

According to another feature of the present disclosure, the protrusion overlaps the swing support member in the front-rear direction in a cross-sectional view of a horizontal plane passing through the swing center of the cutting machine main body. Therefore, when the cutting machine body is swung downward, a downward force is applied to the center of swing of the cutting machine body. The force applied to the pivot center generates a torsional moment in the support arm. By providing the protrusions on the support arm at locations where a large torsional moment acts, the rigidity of the support arm against torsional moments can be effectively improved. This makes it possible to improve the rigidity of the support arm against torsional moments without increasing the size of the product.

According to another feature of the present disclosure, the protrusion has a V-shape with an opening at the rear when viewed in cross section on a horizontal plane passing through the center of swing. Therefore, the protrusion can be provided with light weight and high rigidity. Therefore, the rigidity of the support arm can be improved while minimizing an increase in the mass of the support arm.

According to another feature of the present disclosure, the upper end of the protrusion is located farther from the cutting machine body than the inner end of the slide bar that is closest to the cutting machine body in the left-right direction. The lower end of the protrusion is located closer to the cutting machine body than the inner end in the left-right direction. Therefore, the inner end of the slide bar receives a downward force tilted toward the cutting machine main body when the cutting machine main body is swung downward. Therefore, a torsional moment is generated in the support arm that supports the slide bar, causing it to tilt toward the side where the cutting machine body is located in the left-right direction. By arranging the inner end of the slide bar between both ends of the protrusion in the left-right direction, the rigidity of the support arm against torsional moments can be improved.

According to another feature of the present disclosure, the upper end of the protrusion is disposed above the swing center of the cutting machine body. The lower end of the protrusion is arranged below the center of swing. Therefore, when the cutting machine body swings downward, a torsional moment is generated in the support arm that causes it to tilt forward. By arranging the center of swing of the cutting machine body between both ends of the protrusion in the vertical direction, the rigidity of the support arm against torsional moments can be improved.

According to another feature of the present disclosure, the protrusion is provided in a recess formed by the upper and middle portions of the support arm when viewed from the side. The recess in the support arm is therefore provided as a relief for the swing support member or the cutting machine body. By providing the protrusions, the rigidity of the recessed portion of the support arm can be increased. Thereby, the rigidity of the support arm can be improved while maintaining the compactness of the product and suppressing interference between the support arm and the swing support member.

According to another feature of the present disclosure, the lower and upper parts of the support arm are offset in the left-right direction. The protrusion is provided between the lower part and the upper part when viewed from the front. Therefore, when the cutting machine main body is swung downward, a torsional moment is applied to the upper part of the support arm, which causes the upper part of the support arm to tilt toward the side where the cutting machine main body is located in the left-right direction. By providing the protrusion between the lower part and the upper part which are shifted in the left-right direction, the rigidity of the support arm against a torsional moment tilting in the left-right direction can be effectively improved.

According to another feature of the present disclosure, the slide bar is arranged on the left or right side with respect to the cutting machine body. The support arm has a first side wall on the side where the slide bar is arranged in the left-right direction. The support arm has a first side wall and a second side wall opposite to the left and right sides. The protrusion is provided along the first side wall. Therefore, when the cutting machine main body is swung downward, the influence of the torsional moment acting on the support arm is greater on the first side wall that is farther from the cutting machine main body than on the second side wall that is closer to the cutting machine main body. Therefore, by providing the protrusion along the first side wall, the rigidity of the support arm against torsional moments can be effectively improved.

According to other features of the disclosure, the first side wall extends further rearward than the second side wall. Therefore, the second side wall can be provided compactly while improving the rigidity of the first side wall, which requires high rigidity. Thereby, the rigidity of the support arm can be effectively improved while suppressing the increase in size of the support arm.

According to other features of the disclosure, the rear surface of the lower part of the support arm is located more forward than the front surface of the upper part of the support arm. Therefore, interference between the swing support member and the support arm can be suppressed while maintaining good rigidity of the support arm.

According to another feature of the present disclosure, the table is horizontally rotatable about the table rotation support shaft. The distance from the contact surface of the table and the support arm to the table rotation spindle is smaller than the diameter of the cutting tool. Therefore, the frontmost contact surface of the support arm can be moved closer to the table rotation spindle while maintaining the longitudinal stroke of the cutting machine body. Therefore, it is possible to achieve both the cutting ability and compactness of a tabletop cutting machine.

According to other features of the disclosure, the slide bar is located to the right of the cutting tool. Therefore, the visibility of the cutting position of the cutting tool can be improved for the user who operates the table cutter with his right hand.

According to other features of the disclosure, the slide bar is fixed to the support arm. The swing support member is slidably supported on the slide bar. Therefore, when the swing support member is slid, the longitudinal position of the slide bar does not change. Therefore, the swing support member and the cutting machine main body can be moved in the front and rear directions while maintaining the compactness of the product.

Embodiments of the present disclosure will be described based on FIGS. 1 to 14. In this embodiment, a table-top cutting machine 1 called a so-called sliding circular saw is exemplified. As shown in FIGS. 1 and 2, the table-top cutting machine 1 includes a base 2 that is placed on a table or floor, a turntable 4 on which a material to be cut is placed, and a cutting machine located above the turntable 4. It has a machine body 10. The turntable 4 is supported above the base 2 so as to be rotatable in the horizontal direction about a table rotation support shaft 2a that extends in the vertical direction. The cutting machine main body 10 rotatably supports a substantially disk-shaped cutting tool (circular saw blade) 11 called a tipped saw blade. A user positions himself in front of the tabletop cutting machine 1 and performs cutting work. In the following description, the front side is defined as the front side when viewed from the user in the front-rear direction. The vertical, horizontal, and horizontal directions are defined based on the user.

As shown in FIGS. 1 and 4, the table top surface 4a of the turntable 4 has a substantially circular shape in plan view and extends horizontally. A table rotation support shaft 2a is located at the center of the substantially disk-shaped turntable 4. The base 2 has auxiliary tables 3 on both left and right sides of the turntable 4, the top surface height of which is the same as the table top surface 4a. The turntable 4 has a table extension 5 extending forward along the side surface of the cutting tool 11. A cutting edge plate 5a is provided on the upper surface of the turntable 4 and the table extension 5. A notch-shaped slot 5b extending along the side surface of the cutting tool 11 is provided in the center of the cutting edge plate 5a.

As shown in FIGS. 2 and 3, an adjustment bolt 67 is provided at the bottom of the table extension 5 to support the table extension 5 from below. The adjustment bolt 67 is supported by the table extension 5 and can be moved up and down by screw operation. The adjustment bolt 67 is moved up and down to bring the lower end of the adjustment bolt 67 into contact with the installation surface F. This allows the height of the table extension 5 to be adjusted. In addition, it is possible to eliminate the looseness in the installation of the table extension part 5.

As shown in FIGS. 3 and 4, above the turntable 4 and the auxiliary table 3, a wall-shaped positioning fence 6 extending in the left-right direction and extending upward is provided. The positioning fence 6 is supported by the left and right auxiliary tables 3. A positioning surface 6a, which is the front surface of the positioning fence 6, is located on a vertical plane passing through the table rotation support shaft 2a, which is 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 2, an arc-shaped miter scale plate 7 is provided in an area approximately half the circumference of the front portion of the base 2. As shown in FIGS. The miter scale plate 7 extends horizontally below the table top surface 4a. The miter scale plate 7 cooperates with indicators 8 provided on the left and right sides of the turntable 4 to display the rotation angle of the turntable 4. The rotation angle of the turntable 4 is the angle between the side surface of the cutting tool 11 and the positioning surface 6a of the positioning fence 6. By rotating the turntable 4 either left or right, the cutting tool 11 can be placed in an oblique position with respect to the positioning surface 6a of the positioning fence 6. Cutting the workpiece in this position is called diagonal cutting (English name: miter cut). 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 a positioning pin 66a, which will be described later, can enter into the positioning recess 7b. The miter scale plate 7 is fixed to the base 2 by a plurality of fixing screws 7a. The fixing screw 7a is inserted into a long hole that passes through the miter scale plate 7 in the vertical direction. 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, the right angle between the cutting tool 11 and the positioning fence 6 can be precisely adjusted. This adjustment is mainly performed during the product production process.

As shown in FIGS. 1 and 2, a substantially cylindrical arm support portion 4b having an axial direction in the front-rear direction is provided at the rear of the turntable 4. A support arm 40 extending substantially upward is provided at the rear of the arm support portion 4b. The support arm 40 is supported so as to be tiltable in the left-right direction relative to the arm support portion 4b around a left-right tilting support shaft 40a extending in the front-back direction. The structure of the support arm 40 will be explained in detail later.

As shown in FIGS. 1 and 2, the arm support portion 4b has a pair of left and right inclined stopper bolts 4d. The tip of the inclined stopper bolt 4d projects inside the arm support portion 4b. The amount of protrusion of the inclined stopper bolt 4d can be adjusted by rotating the inclined stopper bolt 4d around its axis using a hexagonal wrench or the like. This adjustment is mainly performed during the product production process.

As shown in FIGS. 3 and 10, a maximum inclination angle switching lever 48 is provided at the rear of the lower part 41 of the support arm 40. The lever shaft of the maximum inclination angle switching lever 48 extends forward. The lever shaft of the maximum inclination angle switching lever 48 comes into contact with the inclination stopper bolt 4d by tilting the support arm 40 left and right. The support arm 40 can be tilted in the left-right direction until the lever shaft comes into contact with either the left or right tilt stopper bolt 4d. By rotating the maximum inclination angle switching lever 48, the part of the lever shaft that comes into contact with the inclination stopper bolt 4d is switched. Thereby, the maximum inclination angle about the left-right tilting support shaft 40a can be changed from 45° to 46°, for example. By tilting the cutting tool 11 left and right, a so-called bevel cut (English name: bevel cut) can be performed on the workpiece placed on the turntable 4.

As shown in FIGS. 2 and 3, an elongated slide bar 47 that extends horizontally and parallel to the side surface of the cutting tool 11 is attached to the upper portion 43 of the support arm 40. The slide bar 47 is attached to a bar support portion 43b provided on the front surface 43a of the upper portion 43, and is fixed so as not to move relative to the support arm 40. The slide bar 47 includes an upper first bar 47a and a lower second bar 47b that are arranged in parallel in the vertical direction. A swing support member 50 is attached to the first bar 47a and the second bar 47b so as to be slidable in the front-rear direction. The bar mounting portion 50c of the swing support member 50 is provided with through holes through which the first bar 47a and the second bar 47b can be inserted. A bearing is interposed between the through hole of the bar mounting portion 50c and the slide bar 47. This allows the swing support member 50 to slide along the slide bar 47.

As shown in FIGS. 3, 4, and 8, the cutting machine main body 10 is connected to the swing support member 50 on the left side of the bar mounting portion 50c. The first bar 47a and the second bar 47b are located to the right of the cutting machine main body 10 when the cutting tool 11 is vertical. The left end (inside end) 47c of the second bar 47b (the virtual vertical plane Z passing through it) is located closest to the cutting machine main body 10 in the slide bar 47 when viewed from the front. By sliding the swing support member 50 in the front-back direction, a wide material to be cut, for example, placed on the turntable 4 can be cut. A knob 50d is provided on the bar mounting portion 50c. By rotating the knob 50d in the tightening direction, the swing support member 50 can be fixed relative to the slide bar 47 so as not to move in the front-rear direction.

As shown in FIGS. 1 and 3, the cutting machine main body 10 is vertically swingable with respect to a swing support member 50 about a vertical swing support shaft 10a extending in the left-right direction. The vertical swing support shaft 10a is located at the rear of the cutting tool 11. By swinging the cutting machine main body 10 downward, the cutting tool 11 can be made to cut into the material to be cut placed on the turntable 4. A torsion spring 10b (see FIG. 12) is provided around the vertical swing support shaft 10a to bias the cutting machine main body 10 upward toward the top dead center.

As shown in FIGS. 1 and 3, the cutting machine main body 10 has a fixed cover 12 that covers the cutting tool 11 and a movable cover 13. The fixed cover 12 covers the upper half circumference of the cutting tool 11 from both 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 direction of rotation of the cutting tool 11 is displayed. The movable cover 13 can cover the lower half of the cutter 11. The movable cover 13 rotates in conjunction with the vertical swinging of the cutting machine body 10, and opens and closes the lower half circumference of the cutting tool 11. When swinging the cutting machine main body 10 upward, the movable cover 13 rotates toward the closed position (clockwise in FIG. 3). When the cutting machine main body 10 is located at the top dead center, the lower half circumference of the cutting tool 11 is covered. When swinging the cutting machine body 10 downward, the movable cover 13 rotates in the direction of the open position (counterclockwise in FIG. 3). Therefore, the lower half circumference range of the cutting tool 11 is exposed, and the cutting tool 11 in the exposed range can be made to cut into the material to be cut placed on the turntable 4.

As shown in FIG. 11, the cutting tool 11 is integrally attached to an output shaft 25 that extends in the left-right direction and is rotatably supported by the cutting machine main body 10. The cutting tool 11 is attached to the output shaft 25 by tightening the fixing screw 14 with the center of rotation being sandwiched between the outer flange 15 and the inner flange 16 from both left and right sides.

As shown in FIGS. 1 and 3, a dust collection guide 17 is provided at the rear lower side of the fixed cover 12. The dust collection guide 17 has a substantially C-shaped wall shape in plan view that extends in the vertical direction and is open at the front. The dust collection guide 17 suppresses scattering of chips generated when the cutting tool 11 cuts the material to be cut. The upper part of the dust collection guide 17 communicates with a dust outlet 17a extending rearward from the rear of the cutting machine main body 10. The dust outlet 17a is connected to a separately prepared dust collector via a dust collection hose. Thereby, chips scattered around the dust collection guide 17 can be sent to the dust collector.

As shown in FIGS. 6, 8, and 10, a bottom dead center stopper 18 is provided on the right side of the cutting machine main body 10. The bottom dead center stopper 18 has a bolt 18b screwed to the cutting machine main body 10. A protrusion 18a at the tip of the bolt 18b protrudes downward. The protrusion length of the protrusion 18a can be changed, for example, by inserting a hexagonal wrench into the hexagonal hole in the head of the bolt 18b and rotating it. Thereby, the position of the bottom dead center of the cutting machine main body 10 can be finely adjusted. A protrusion projecting forward is provided on the front right side of the swing support member 50 . A bottom dead center stopper contact portion 50a is provided on the upper surface of this projection, which comes into contact with the projection 18a when the cutting machine main body 10 is lowered to the bottom dead center.

As shown in FIGS. 6 and 8, a top dead center stopper 19 is provided on the right side of the fixed cover 12 and projects to the right. The top dead center stopper 19 is provided at a lower position than the bottom dead center stopper 18. The top dead center stopper 19 is formed of a rubber sleeve and is screwed to the fixed cover 12. A top dead center stopper abutment portion 50b is provided at the right front portion of the swing support member 50. The top dead center stopper contact portion 50b is provided on the lower surface side of the protrusion on which the bottom dead center stopper contact portion 50a is provided. The top dead center stopper 19 contacts the top dead center stopper contact portion 50b, so that the upward movement of the cutting machine main body 10 is stopped at the top dead center.

As shown in FIG. 1, a bottom dead center lock pin 51 extending leftward is provided on the left side surface of the front portion of the swing support member 50. The bottom dead center lock pin 51 is movable in the left and right direction. The fixed cover 12 is provided with a through hole into which the bottom dead center lock pin 51 can enter when the cutting machine main body 10 moves to the bottom dead center. The cutting machine main body 10 can be locked at the bottom dead center by pushing the left end of the bottom dead center locking pin 51 to move it to the right and entering the bottom dead center locking pin 51 into the through hole of the fixed cover 12.

As shown in FIGS. 6 and 7, the cutting machine main body 10 has a motor housing 20 on the right side of the fixed cover 12. As shown in FIGS. The motor housing 20 is provided between the cutting tool 11 and the slide bar 47 in the left-right direction. An electric motor 21 is housed in the motor housing 20 . A motor shaft 21a (see FIG. 11) of the electric motor 21 extends in the front-rear direction along a motor axis J that is parallel to the side surface of the cutting tool 11.

As shown in FIG. 11, the electric motor 21 is a motor called a DC brushless motor. 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 can rotate integrally with the motor shaft 21a. The rotation angle of the rotor 21c is detected by a sensor board 21d provided on the rear inner peripheral surface of the motor housing 20.

As shown in FIG. 11, an intake port 20a capable of taking in outside air is provided on the rear surface (end surface opposite to the gear) 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. 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 at the front in the direction in which the motor shaft 21a extends. The cooling air that has flowed to the fan 22 is discharged from an exhaust port provided on the outer peripheral surface of the motor housing 20 on the gear side.

As shown in FIG. 11, a gear housing 23 is connected to the front part of the motor housing 20 in the extending direction of the motor shaft 21a. The front part of the motor shaft 21a in the extending direction enters into the gear housing 23. A drive-side bevel gear 21e is integrally attached to the front portion of the motor shaft 21a in the extending direction. The gear housing 23 is also connected to the right side of the fixed cover 12. An intermediate shaft 24 extending in the left-right direction is rotatably housed in the gear housing 23 . A reduction gear 24b is formed as an integral part on the left side of the intermediate shaft 24. A driven bevel gear 24a is attached to the right side of the intermediate shaft 24. The driving bevel gear 21e and the driven bevel gear 24a mesh with each other. Thereby, the rotational power of the motor shaft 21a is transmitted to the intermediate shaft 24 at a reduced speed.

As shown in FIG. 11, an output shaft 25 is arranged below the intermediate shaft 24 in a position parallel to the intermediate shaft 24 and rotatable around the axis. A reduction gear 25a is attached to the right side of the output shaft 25. The reduction gear 24b and the reduction gear 25a mesh with each other. The rotational power of the intermediate shaft 24 is thus transmitted to the output shaft 25 after the rotational power of the motor shaft 21a is reduced in speed, thereby rotating the cutting tool 11.

As shown in FIGS. 3 and 6, a rectangular box-shaped controller housing 26 is provided at the rear upper side of the motor housing 20. A controller 27 is housed in the controller housing 26 . The controller 27 has a shallow, substantially rectangular parallelepiped case, and a control board housed in the case and molded with resin. The controller 27 is mainly equipped with a control circuit, a drive circuit, an auto-stop circuit, etc. for controlling the operation of the electric motor 21. The control circuit includes a microcomputer that transmits a control signal to the electric motor 21 based on position information of the rotor 21c (see FIG. 11). The drive circuit includes a FET that switches the current of the electric motor 21 based on a control signal received from the control circuit. The auto-stop circuit cuts off power supply to the electric motor 21 according to the detection result of the state of the battery 29 to prevent over-discharge or over-current. Inlet ports 26a that can take in outside air are provided on the left and right sides of the controller housing 26. The inside of the controller housing 26 communicates with the inside of the motor housing 20. By rotating the fan 22, cooling air is introduced into the controller housing 26 from the intake port 26a, and the controller 27 is cooled.

As shown in FIGS. 3 and 6, a battery mounting portion 28 is provided at the rear of the controller housing 26. The mounting surface of the battery mounting portion 28 faces rearward and extends generally vertically when the cutting machine main body 10 is located at the top dead center. A substantially rectangular box-shaped battery 29 can be attached to the battery attachment portion 28 by sliding it from above to below. Further, the battery 29 can be removed from the battery mounting portion 28 by sliding it from below to above. The battery 29 is, for example, a lithium ion battery with an output voltage of 36V. The battery 29 can be removed from the battery mounting portion 28 and repeatedly charged using a separately prepared charger. The battery 29 can be used as a power source for other rechargeable power tools such as a screwdriver or an electric drill.

As shown in FIGS. 3, 4, and 8, the cutting machine main body 10 has a handle portion 30. As shown in FIGS. A loop-shaped operating handle 31 is provided at the front of the handle portion 30. The operating handle 31 is provided between the fixed cover 12 and the slide bar 47 in the left-right direction. A switch lever 32 is provided on the inner peripheral side of the operating handle 31. The switch lever 32 can be pulled by the user while gripping the operating handle 31 with a finger. When the switch lever 32 is pulled, the electric motor 21 is started and the cutting tool 11 is rotated. A lock-off button 33 is provided on the front surface of the operating handle 31. When the lock-off button 33 is not pressed, the switch lever 32 is not pulled and is in a locked state. By pressing the lock-off button 33, the switch lever 32 can be pulled. This prevents unexpected activation of the electric motor 21.

As shown in FIGS. 3 and 4, the handle portion 30 has a loop-shaped carrying handle 34 behind the operation handle 31. As shown in FIGS. One end of the carrying handle 34 is connected to the left side of the fixed cover 12. The other end of the carrying handle 34 is connected to the left side of the controller housing 26. The carrying handle 34 extends approximately horizontally in the front-rear direction when the cutting machine main body 10 is moved to the bottom dead center. With the cutting machine main body 10 locked at the bottom dead center by the bottom dead center lock pin 51, the user can carry the desktop cutting machine 1 by holding the carrying handle 34.

As shown in FIGS. 2, 4, and 6, switches 35 and 36 are provided on the right side of the operating handle 31. By pressing the switch 35, the laser beam of the laser irradiator 37 (see FIG. 8) for line alignment can be turned on and off. By pressing the switch 36, the irradiation light of the lighting fixture 38 provided above the cutting machine main body 10 can be switched on and off. The lighting fixture 38 is supported by an arm 38a extending leftward from the top of the operating handle 31. The illumination tool 38 illuminates the area around the cutting area of the cutting tool 11. A communication adapter 39 can be inserted and attached to the rear part of the operating handle 31. The communication adapter 39 is capable of wireless communication with other incidental equipment such as a dust collector installed separately from the desktop cutting machine 1, for example. The starting and stopping operations of the desktop cutting machine 1 and the auxiliary equipment can be linked through wireless communication.

As shown in FIGS. 1 and 3, a turntable fixing mechanism 60 is provided at the bottom of the table extension 5. As shown in FIGS. A grip part 61 is provided at the front part of the table extension part 5. The grip portion 61 has an uneven shape on its peripheral edge so that it can be easily gripped and rotated by a user. A user can rotate the turntable 4 horizontally with respect to the base 2 by gripping the grip portion 61. A fixing rod extends in the front-rear direction from the grip portion 61 toward the interior rear of the table extension portion 5. When the grip portion 61 is rotated around the axis, the fixed rod is displaced in the front-back direction. By displacing the fixed rod rearward and engaging the rear end with the base 2, the turntable 4 can be positioned with respect to the base 2 at an arbitrary miter angle. By displacing the fixed rod forward, the positioning of the turntable 4 at any miter angle can be released.

As shown in FIGS. 3 and 13, a positive locking mechanism 65 is provided at the bottom of the table extension 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 has a lock release lever 66 and a positioning pin 66a. The lock release lever 66 is provided behind the grip part 61 at the front of the table extension part 5. The positioning pin 66a extends in the front-rear direction along the longitudinal direction of the table extension part 5 at the lower part of the table extension part 5. The positioning pin 66a is provided at approximately the same height as the miter scale plate 7 and is movable in the front-back direction.

As shown in FIGS. 3 and 13, the front part of the positioning pin 66a is connected to the lock release lever 66. When the lock release lever 66 is pushed downward, the positioning pin 66a is displaced forward against the biasing force of the compression spring 66b. The rear end of the positioning pin 66a that has been displaced forward is located outside the positioning recess 7b and does not engage with the positioning recess 7b. Therefore, when the positioning of the turntable 4 is released, the turntable 4 can be freely rotated in the left-right direction by gripping the grip portion 61. When the lock release lever 66 is raised upward, the positioning pin 66a moves rearward due to the biasing force of the compression spring 66b. The rear end of the positioning pin 66a contacts the outer peripheral edge of the miter scale plate 7. When the turntable 4 is rotated horizontally by gripping the grip portion 61, the positioning pin 66a enters one of the positioning recesses 7b provided on the outer peripheral edge of the miter scale plate 7. In this way, the turntable 4 is positioned at a predetermined miter angle position corresponding to the positioning recess 7b.

As shown in FIGS. 3 and 13, a tilting fixing mechanism 70 is provided at the front of the table extension 5 to hold the support arm 40 in a tiltable position in the left-right direction. The tilting fixing mechanism 70 has a tilting fixing operation section 71 and a transmission shaft 73. The tilting fixing operation part 71 is provided between the grip part 61 and the front end of the table extension part 5. The tilting fixing operation section 71 can be rotated around an axis coaxial with the grip section 61. The tilting fixing operation part 71 has a concavo-convex shape on its peripheral edge that has a pattern different from the concave-convex shape of the grip part 61 so that the user can easily hold and rotate the tilting fixing operation part 71. Therefore, when the user holds it, the tilting fixed operation section 71 and the grip section 61 can be easily distinguished, and erroneous operations can be prevented.

As shown in FIG. 13, the transmission shaft 73 extends in the front-rear direction along the longitudinal direction of the table extension 5. As shown in FIG. The transmission shaft 73 extends to the lower part 41 of the support arm 40 . The front part of the transmission shaft 73 is connected to the tilting fixing operation part 71 and the reduction gear part 72. The rotational power of the tilting fixing operation section 71 is reduced by the reduction gear section 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 of the transmission shaft 73 in front of the lower portion 41 . The receiving portion 75 is fixed to the transmission shaft 73 in front of the thrust needle bearing 74. The rear end of the transmission shaft 73 is located inside the lower part 41, and a nut 76 is attached thereto. The rotation of the nut 76 about the axis of the transmission shaft 73 with respect to the lower part 41 is restricted. The thrust needle bearing 74, the receiving part 75, and the nut 76 sandwich the arm support part 4b and the lower part 41 in the front-back direction.

The transmission shaft 73 shown in FIG. 13 is rotated around the axis to fasten the rear end of the transmission shaft 73 and the nut 76. At this time, the lower portion 41 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, the receiving portion 75, and the nut 76. In this way, the support arm 40 is positioned at a predetermined left-right tilt angle with respect to the arm support portion 4b. When the transmission shaft 73 is rotated in the opposite direction around the axis, the nut 76 is loosened from the transmission shaft 73. At this time, the axial force between the thrust needle bearing 74 and the receiving portion 75 and the nut 76 is released. Therefore, the support arm 40 can be tilted left and right around the left and right tilting support shaft 40a (see FIG. 8) with respect to the arm support portion 4b.

As shown in FIGS. 3, 8, and 14, the support arm 40 is provided in a so-called crank shape that is bent in side view and front view. The support arm 40 has a lower part 41, an upper part 43 located rearward than the lower part 41, and an intermediate part 42 that connects the lower part 41 and the upper part 43. The lower part 41, the middle part 42, and the upper part 43 are integrally formed of the same material. The lower part 41 and the upper part 43 each correspond to a crank-shaped arm. The lower part 41 has a substantially cylindrical shape centered on the left-right tilting support shaft 40a. The intermediate portion 42 is located between the lower portion 41 and the upper portion 43 in the vertical direction. The intermediate portion 42 slopes upward, rearward, and rightward when the cutting tool 11 is vertical. The upper portion 43 extends upward from the intermediate portion 42 and is inclined to the right. The upper part 43 extends substantially vertically in a side view when the cutting tool 11 is vertical, and is located to the right of the lower part 41. The first side wall 44, which is the right side wall of the support arm 40, is located farther from the cutting machine main body 10 than the second side wall, which is the left side wall of the support arm.

As shown in FIG. 3, a contact surface 41a, which is the front surface of the lower part 41, slidably contacts a contact surface 4c, which is the rear surface of the arm support portion 4b. The contact surface 41a is arranged such that the distance in the horizontal direction from the table rotation support shaft 2a is shorter than the diameter 11a of the cutting tool 11. The rear surface 41b of the lower part 41 stands up substantially vertically with the cutting tool 11 being vertical. The rear surface 41b is located further forward than the front surface 43a of the upper portion 43.

As shown in FIG. 14, a circular insertion hole 41c is provided at the center of the lower portion 41, through which the left-right tilting support shaft 40a (see FIG. 10) can be inserted. Below the insertion hole 41c, the lower part 41 is provided with a circular insertion hole 41d that penetrates in the front-rear direction. A lever shaft extending forward from the maximum inclination angle switching lever 48 (see FIG. 10) is inserted into the insertion hole 41d. The lower portion 41 is provided with an arcuate hole 41e that extends circumferentially around the insertion hole 41c and penetrates the lower portion 41 in the front-rear direction. The rear end of the transmission shaft 73 (see FIG. 13) of the tilting fixing mechanism 70 is inserted into the arcuate hole 41e. The transmission shaft 73 moves in the circumferential direction around the left-right tilting support shaft 40a within the arcuate hole 41e when tilting the support arm 40 left and right.

As shown in FIGS. 3 and 5, a concave portion 42a having a concave shape in side view is formed between the intermediate portion 42 that slopes upward and backward, and the upper portion 43 that stands up in the vertical direction. Therefore, in the front portion 40c of the support arm 40 located above the intermediate portion 42, a space into which the swing support member 50 can enter is formed in a side view.

As shown in FIGS. 3, 8, and 14, the support arm 40 has a protrusion (convex portion) 46 that protrudes forward from the lower region of the intermediate portion 42 and the upper portion 43 in the front portion 40c. The protrusion 46 is made of the same material as the lower part 41, middle part 42, and upper part 43, and is provided integrally with each other. The protrusion 46 is provided on the right side of the support arm 40. The protrusion 46 extends along the first side wall 44 and extends in the vertical direction. The protrusion 46 has a substantially triangular shape in side view and top view.

As shown in FIGS. 3, 8, and 14, the lower end 46e of the protrusion 46 is one vertex of a substantially triangular shape, and is located on the right side of the lower end of the intermediate portion 42. As shown in FIGS. When the cutting tool 11 is vertical, the lower end 46e is located to the left of the virtual vertical plane Z passing through the inner end 47c of the slide bar 47 (closer to the cutting machine main body 10) and below the vertical swing support shaft 10a when viewed from the front. Located in The upper end 46d of the protrusion 46 is one vertex of a substantially triangular shape, and is located below the bar support portion 43b of the upper portion 43. The upper end 46d is located further back than the lower end 46e. When the cutting tool 11 is vertical, the upper end 46d is located to the right of the virtual vertical plane Z passing through the inner end 47c of the slide bar 47 (on the far side from the cutting machine main body 10) and above the vertical swing support shaft 10a when viewed from the front. Located in The third apex of the substantially triangular shape of the protrusion 46 is located in the recess 42a.

As shown in FIGS. 12 and 14, the right wall 46a and left wall 46b of the protrusion 46 each extend in a planar shape. The right wall 46a is provided following the first side wall 44. The right wall 46a and the left wall 46b intersect in a V-shape at the front end. A vertically long groove-shaped opening 46c is provided at the rear of the protrusion 46. The opening 46c has a concave shape toward the front. The right bottom wall of the opening 46c extends substantially parallel to the right wall 46a. The left bottom wall of the opening 46c extends substantially parallel to the left wall 46b. Thus, the protrusion 46 is formed into a wedge shape in which two flat plate shapes intersect in a V-shape on the horizontal plane passing through the vertical swing support shaft 10a.

As shown in FIG. 10, a plurality of ribs 40b are provided at the rear of the support arm 40, extending linearly between the first side wall 44 on the right side and the second side wall 45 on the left side. More ribs 40b are provided on the right side of the support arm 40 than on the left side. For example, when the cutting tool 11 is vertical, the ribs 40b are provided more densely in a region to the right of the cutting machine main body 10 than in a region overlapping the cutting machine main body 10 in the left-right direction. A side wall of the opening 46c of the protrusion 46 is formed in part to follow the rib 40b.

As shown in FIG. 3, the first side wall 44 extends at the intermediate portion 42 and the upper portion 43 to the same rear position as the rear surface 43c of the upper portion 43. As shown in FIG. On the other hand, the second side wall 45 is at the lower end of the intermediate portion 42 at approximately the same front and back position as the rear surface 41b of the lower portion 41. The second side wall 45 is located at the upper end of the intermediate portion 42 at approximately the same front and back position as the rear surface 43c of the upper portion 43. Therefore, the first side wall 44 has a wider area extending rearward than the second side wall 45.

As shown in FIGS. 5, 8, and 9, the support arm 40 overlaps the swing support member 50 at the front portion 40c when viewed from the side when the swing support member 50 is moved to the rearmost position. The protrusion 46 overlaps the swing support member 50 in a side view when the swing support member 50 is moved to the rearmost position. The front portion 40c of the support arm 40 has an overlap region P1 (the hatched region in FIG. 14) that overlaps the swing support member 50 when viewed from the front, and a non-overlap region that does not overlap the swing support member 50. It is divided into P2 (the non-hatched area in FIG. 14). The protruding ridge 46 is located in the non-overlapping region P2 and does not enter the overlapping region P1 in both the vertical cutting state shown in FIG. 8 and the diagonal cutting state shown in FIG. 9. Therefore, the protrusion 46 is provided at a position where it does not interfere with the swing support member 50.

As described above, the bench cutter 1 includes a turntable 4 on which a material to be cut is placed, as shown in FIGS. 3 and 5. The desktop cutting machine 1 has a support arm 40 that is located behind the turntable 4 and stands upward from the turntable 4. The desktop cutting machine 1 has a slide bar 47 supported by a support arm 40 and extending in the front-rear direction. The desktop cutting machine 1 includes a swing support member 50 that is attached to the slide bar 47 and moves in the direction in which the slide bar 47 extends. The table-top cutting machine 1 includes a cutting machine main body 10 that is supported by a swinging support member 50 so as to be swingable in the vertical direction and rotatably supports a disk-shaped cutting tool 11 . The support arm 40 has a front portion 40c that overlaps the swing support member 50 in a side view when the swing support member 50 is located at the rearmost position.

Therefore, when moving the swing support member 50 to the rearmost position, the front portion 40c of the support arm 40 and the swing support member 50 overlap in the front-rear direction. Therefore, the longitudinal length of the support arm 40 can be increased without reducing the cutting capacity of the table-top cutting machine 1. Furthermore, the longitudinal length of the support arm 40 can be increased without enlarging the rear portion of the support arm 40. Thereby, the support arm 40 can be provided large in the front and back direction while maintaining the compactness of the bench cutter 1.

As shown in FIG. 8, the support arm 40 has an overlap region P1 that overlaps the swing support member 50 when viewed from the front. The support arm 40 has a non-overlapping region P2 that does not overlap the swing support member 50. The front portion 40c of the support arm 40 has a protrusion 46 that projects more forward than the overlap region P1 in the non-overlap region P2. Therefore, the support arm 40 and the swing support member 50 overlap in the left-right direction when viewed from the front. Therefore, it is possible to suppress the support arm 40 from increasing in size in the left-right direction. Moreover, by providing the protrusion 46 that protrudes forward from the support arm 40 in the non-overlapping region P2, a long longitudinal length of the support arm 40 can be ensured.

As shown in FIGS. 3, 4 and 8, the support arm 40 has a lower portion 41 connected to the turntable 4. As shown in FIGS. The support arm 40 has an upper portion 43 located rearward than a lower portion 41 . The support arm 40 has an intermediate portion 42 that connects a lower portion 41 and an upper portion 43 and slopes upward and rearward. The protrusion 46 extends forward and up and down from the intermediate portion 42 . Therefore, the rigidity of the intermediate portion 42 can be improved by the protrusion 46. Therefore, the rigidity in the front-rear direction can be improved between the lower part 41 connected to the front part of the intermediate part 42 and the upper part 43 connected to the rear part of the intermediate part 42. Moreover, by making the protrusion 46 protrude forward from the intermediate portion 42, it is possible to prevent the entire product from increasing rearward.

As shown in FIG. 12, the protrusion 46 overlaps the swing support member 50 in the front-rear direction in a cross-sectional view of a horizontal plane passing through the vertical swing support shaft 10a, which is the center of swing of the cutting machine main body 10. Therefore, when swinging the cutting machine main body 10 downward, a downward force is applied to the vertical swing support shaft 10a. A torsion moment is generated in the support arm 40 due to the force applied to the vertical swing support shaft 10a. By providing the protrusions 46 at locations on the support arm 40 where torsional moments are large, the rigidity of the support arm 40 against torsional moments can be effectively improved. This makes it possible to improve the rigidity of the support arm 40 against torsional moments without increasing the size of the product.

As shown in FIG. 12, the protrusion 46 is V-shaped with an opening 46c at the rear when viewed in cross section on a horizontal plane passing through the vertical swing support shaft 10a. Therefore, the protrusion 46 can be provided with light weight and high rigidity. Therefore, the rigidity of the support arm 40 can be improved while minimizing an increase in the mass of the support arm 40.

As shown in FIG. 8, the upper end 46d of the protrusion 46 is located at a position farther from the cutting machine main body 10 (on the right It is placed in the direction). The lower end 46e of the protrusion 46 is arranged at a position closer to the cutting machine main body 10 (to the left) than the inner end 47c (the virtual vertical plane Z passing through) in the left-right direction. Therefore, the slide bar 47 receives a downward force tilted toward the cutting machine main body 10 when the cutting machine main body 10 swings downward. Therefore, a torsion moment is generated in the upper part 43 of the support arm 40 that supports the slide bar 47 so that the upper part 43 tilts toward the left where the cutting machine main body 10 is located in the left-right direction. By arranging the inner end 47c of the slide bar 47 between both ends of the protrusion 46 in the left-right direction, the rigidity of the support arm 40 against torsional moments can be improved.

As shown in FIG. 3, the upper end 46d of the protrusion 46 is arranged above the vertically swinging support shaft 10a of the cutting machine main body 10. The lower end 46e of the protrusion 46 is arranged below the vertical swing support shaft 10a. Therefore, when the cutting machine main body 10 is swung downward, a torsional moment is generated in the support arm 40 that causes it to tilt forward. By arranging the center of swing of the cutting machine body 10 between both ends of the protrusion 46 in the vertical direction, the rigidity of the support arm 40 against torsional moments can be improved.

As shown in FIG. 3, the protrusion 46 is provided in a recess 42a formed by the upper portion 43 and the intermediate portion 42 of the support arm 40 when viewed from the side. Therefore, the recess 42a of the support arm 40 is provided as a structure to retreat from the swing support member 50 that has moved rearward. By providing the protrusion 46, the rigidity of the recess 42a of the support arm 40 can be increased. Thereby, the rigidity of the support arm 40 can be improved while maintaining the compactness of the product and suppressing interference between the support arm 40 and the swing support member 50.

As shown in FIGS. 8 and 14, the lower part 41 and the upper part 43 of the support arm 40 are disposed offset in the left-right direction. The protrusion 46 is provided between the lower part 41 and the upper part 43 when viewed from the front. Therefore, when the cutting machine main body 10 is swung downward, a torsional moment is applied to the upper part 43 of the support arm 40 to tilt it toward the side where the cutting machine main body 10 is located in the left-right direction. By providing the protrusion 46 between the lower part 41 and the upper part 43 that are shifted in the left-right direction, the rigidity of the support arm 40 against a torsional moment tilting in the left-right direction can be effectively improved.

As shown in FIG. 8, the slide bar 47 is arranged on the right side with respect to the cutting machine main body 10. The support arm 40 has a first side wall 44 on the side where the slide bar 47 is arranged in the left-right direction. The support arm 40 has a first side wall 44 and a second side wall 45 on the left-right opposite side. The protrusion 46 is provided along the first side wall 44 . Therefore, when swinging the cutting machine main body 10 downward, the effect of the torsional moment acting on the support arm 40 is greater on the first side wall 44 that is farther from the cutting machine main body 10 than on the second side wall 45 that is closer to the cutting machine main body 10. big. Therefore, by providing the protrusion 46 along the first side wall 44, the rigidity of the support arm 40 against torsional moments can be effectively improved.

As shown in FIG. 3, the first side wall 44 extends further rearward than the second side wall 45. As shown in FIG. Therefore, the second side wall 45 can be provided compactly while improving the rigidity of the first side wall 44, which requires high rigidity. Thereby, the rigidity of the support arm 40 can be effectively improved while suppressing the enlargement of the support arm 40.

As shown in FIG. 3, the rear surface 41b of the lower part 41 of the support arm 40 is located in front of the front surface 43a of the upper part 43 of the support arm 40. Therefore, interference between the swing support member 50 and the support arm 40 can be suppressed while maintaining good rigidity of the support arm 40.

As shown in FIG. 3, the turntable 4 is horizontally rotatable about the table rotation support shaft 2a. The distance 4e from the contact surface 41a of the turntable 4 and the support arm 40 to the table rotation support shaft 2a is smaller than the diameter 11a of the cutting tool 11. Therefore, while maintaining the longitudinal stroke of the cutting machine body 10, the contact surface 41a located at the forefront of the support arm 40 can be brought closer to the table rotation support shaft 2a. Therefore, the cutting ability and compactness of the table-top cutting machine 1 can be achieved at the same time.

As shown in FIGS. 4 and 8, the slide bar 47 is arranged on the right side of the cutting tool 11. Therefore, the visibility of the cutting position of the cutting tool 11 can be improved for the user who operates the table cutter 1 with his right hand.

As shown in FIGS. 3 and 5, the slide bar 47 is fixed to the support arm 40. The swing support member 50 is slidably supported by the slide bar 47. Therefore, when the swing support member 50 is slid, the longitudinal position of the slide bar 47 does not change. Therefore, the swing support member 50 and the cutting machine main body 10 can be moved back and forth while maintaining the compactness of the product.

Various changes can be made to the tabletop cutting machine 1 of this embodiment described above. The desktop cutting machine 1 in which the slide bar 47 is fixed to the support arm 40 and the swing support member 50 slides in the front and rear directions with respect to the slide bar 47 is illustrated. Alternatively, a configuration may be adopted in which, for example, a slide bar is fixed to the swing support member, and the slide bar moves back and forth with respect to the support arm, thereby causing the swing support member to move back and forth.

The table-top cutting machine 1 is illustrated in which the slide bar 47 is located on the right side of the cutting machine main body 10. Alternatively, the slide bar may be placed on the left side of the cutting machine main body. In this case, the support arm has a structure that tilts upward and to the left while the cutting tool is in a vertical state. The convex portion (protrusion) is provided along the left side wall of the support arm. Although the slide bar 47 includes two bars 47a and 47b as an example, the number of bars may be one, or three or more bars may be arranged in parallel. The slide bar 47 may be non-parallel to the side surface of the cutting tool 11. The slide bar 47 may be non-parallel to the horizontal line.

The desktop cutting machine 1 is illustrated in which the electric motor 21 is driven by using a battery 29 as a DC power source as a power source. Alternatively, the present invention may be applied to, for example, a table-top cutting machine in which an electric motor is driven by an AC power source. The posture of the electric motor 21 (extending direction of the motor axis J), the mounting position of the battery 29, the arrangement of the operating handle 31, etc. are not limited to those illustrated, and may be changed as appropriate.

1... Tabletop cutting machine 2... Base, 2a... Table rotation support shaft 3... Auxiliary table 4... Turntable (table), 4a... Table top surface, 4b... Arm support part 4c... Contact surface, 4d... Inclined stopper bolt, 4e …Distance 5…Table extension, 5a…Blade plate, 5b…Slot hole 6…Positioning fence, 6a…Positioning surface 7…Miter scale plate, 7a…Fixing screw, 7b…Positioning recess 8…Indicator 10…Cutting machine body , 10a... Vertical swing support shaft (swing center), 10b... Torsion spring 11... Cutting tool, 11a... Diameter 12... Fixed cover, 12a... Arrow 13... Movable cover 14... Fixed screw 15... Outer flange 16... Inner flange 17 ...Dust collection guide, 17a...Dust outlet 18...Bottom dead center stopper, 18a...Protrusion, 18b...Bolt 19...Top dead center stopper 20...Motor housing, 20a...Intake port 21...Electric motor, 21a...Motor shaft, 21b... Stator, 21c... Rotor 21d... Sensor board, 21e... Drive side bevel gear 22... Fan 23... Gear housing 24... Intermediate shaft, 24a... Driven side bevel gear, 24b... Reduction gear 25... Output shaft, 25a... Reduction gear 26...Controller housing, 26a...Intake port 27...Controller 28...Battery mounting part 29...Battery 30...Handle part 31...Operation handle 32...Switch lever 33...Lock-off button 34...Carrying handle 35...Switch (for laser irradiator)
36...Switch (for lighting equipment)
37...Laser irradiator 38...Lighting device, 38a...Arm 39...Communication adapter 40...Support arm, 40a...Right and left tilting support shaft, 40b...Rib, 40c...Front portion 41...Lower, 41a...Abutment surface, 41b...Rear surface , 41c, 41d...Insertion hole 41e...Circular hole 42...Middle part, 42a...Recessed part 43...Upper part, 43a...Front surface, 43b...Bar support part, 43c...Rear surface 44...First side wall 45...Second side wall 46...Protrusion Strip (convex portion), 46a...Right wall, 46b...Left wall, 46c...Opening, 46d...Upper end 46e...Lower end 47...Slide bar, 47a...First bar, 47b...Second bar, 47c...Inner end 48...Maximum Inclination angle switching lever 50...Swinging support member, 50a...Bottom dead center stopper contact part, 50b...Top dead center stopper contact part, 50c...Bar attachment part, 50d...Knob 51...Bottom dead center lock pin 60...Turn Table fixing mechanism 61...Grip part 65...Positive locking mechanism 66...Lock release lever, 66a...Positioning pin, 66b...Compression spring 67...Adjust bolt 70...Tilt fixing mechanism 71...Tilt fixing operation part 72...Reduction gear part 73...Transmission Shaft 74... Thrust needle bearing 75... Receiving portion 76... Nut F... Installation surface P1... Overlapping area, P2... Non-overlapping area J... Motor axis Z... Virtual vertical plane

Claims (15)

A tabletop cutting machine,
A table on which the material to be cut is placed;
a support arm located behind the table and rising upward from the table;
a slide bar supported by the support arm and extending in the front-rear direction;
a swinging support member that is attached to the slide bar and moves in the direction in which the slide bar extends;
A cutting machine main body is supported by the swing support member so as to be swingable in the vertical direction and rotatably supports a disc-shaped cutting tool;
The support arm has a front portion that overlaps the swing support member in a side view when the swing support member is located at the rearmost position. The tabletop cutting machine according to claim 1,
The support arm has an overlap region that overlaps the swing support member in a front view, and a non-overlap region that does not overlap the swing support member,
The front portion of the support arm has a convex portion that protrudes more forward than the overlap region in the non-overlap region. The desktop cutting machine according to claim 2,
The support arm has a lower part connected to the table, an upper part located rearward than the lower part, and an intermediate part connecting the lower part and the upper part and tilting upward and rearward,
In the desktop cutting machine, the convex portion is a protrusion that extends forward and up and down from the intermediate portion. The desktop cutting machine according to claim 3,
In the table-top cutting machine, the protrusion overlaps the swing support member in the front-rear direction in a cross-sectional view of a horizontal plane passing through the swing center of the cutting machine main body. The desktop cutting machine according to claim 4,
In the table-top cutting machine, the protrusion has a V-shape with an opening at the rear in a cross-sectional view of the horizontal plane passing through the swing center. The table-top cutting machine according to any one of claims 3 to 5,
The upper end of the protrusion is located farther from the cutting machine main body than the inner end of the slide bar closest to the cutting machine main body in the left-right direction,
In the table-top cutting machine, the lower end of the protrusion is disposed at a position closer to the cutting machine main body than the inner end in the left-right direction. The table-top cutting machine according to any one of claims 3 to 6,
The upper end of the protrusion is arranged above the swing center of the cutting machine main body,
The lower end of the protrusion is disposed below the center of swing. The table-top cutting machine according to any one of claims 3 to 7,
The said protrusion is provided in the recessed part formed by the said upper part and the said intermediate part of the said support arm in side view. The table-top cutting machine according to any one of claims 3 to 8,
The lower part and the upper part of the support arm are arranged offset in the left-right direction,
In the desktop cutting machine, the protrusion is provided between the lower part and the upper part when viewed from the front. A desktop cutting machine according to any one of claims 3 to 9,
The slide bar is arranged on the left or right side with respect to the cutting machine main body,
The support arm has a first side wall on the side where the slide bar is arranged in the left-right direction, and a second side wall on the left-right opposite side to the first side wall,
In the desktop cutting machine, the protrusion is provided along the first side wall. The tabletop cutting machine according to claim 10,
The first side wall extends further rearward than the second side wall. The table-top cutting machine according to any one of claims 3 to 11,
The table cutter is characterized in that a rear surface of the lower portion of the support arm is located forward of a front surface of the upper portion of the support arm. The table-top cutting machine according to any one of claims 1 to 12,
The table is horizontally rotatable around a table rotation spindle,
A table-top cutting machine in which the distance from the contact surface of the table and the support arm to the table rotation support shaft is smaller than the diameter of the cutting tool. A desktop cutting machine according to any one of claims 1 to 13,
The slide bar is placed on the right side of the cutting tool. A desktop cutting machine according to any one of claims 1 to 14,
the slide bar is fixed to the support arm;
The swing support member is slidably supported on the slide bar.

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