Desktop cutting machine

Abstract

To provide a tilting fixing operation part which has good operability, in a table cutter capable of performing oblique cutting.SOLUTION: A table cutter 1 includes: a turn table fixing mechanism 40; and a tilting fixing mechanism 60 capable of fixing the tilting in the left-to-right direction of a cutter body. The turn table fixing mechanism 40 includes: a rotationally operable grip part 41; and a fixing rod 42 which can fix a turn table 4 to a base 2 by the rotation operation of the grip part 41. The grip part 41 is arranged on the front side with respect to a front surface of a table extension part 5, below an upper surface of the turn table 4 and at the center in the left-to-right direction of the table extension part 5. The tilting fixing mechanism 60 includes a rotationally operable tilting fixing operation part 61. The tilting fixing operation part 61 is provided on the front side with respect to the front surface of the table extension part 5 and behind the grip part 41. A rotary shaft of the tilting fixing operation part 61 is provided coaxially with the rotary shaft of the grip part 41.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a desktop cutting machine used for cutting wood, for example, and more particularly to a desktop cutting machine capable of performing inclined cutting.

Background Art

[0002] This type of desktop cutting machine includes, for example, a base placed on a table or the like, a turntable rotatably supported horizontally on the base, and a cutting machine main body supported above the turntable. By cutting a cutting tool rotatably supported by the cutting machine main body into a workpiece placed on the turntable, the workpiece can be cut. The cutting machine main body is provided so as to be tiltable in the left-right direction with respect to the turntable, and a so-called inclined cutting is enabled. In this case, the desktop cutting machine is provided with a tilt fixing operation unit. As described in Patent Documents 1 to 3, the tilt fixing operation unit can tilt the cutting machine main body at a predetermined tilt angle in the left-right direction and fix the posture of the cutting machine main body at the tilt angle. Thereby, for example, a so-called inclined cutting can be performed in which the cutting machine main body is tilted 45° to the right and the cutting tool is cut into the workpiece.

[0003] Conventionally, as described in Patent Document 1, for example, the tilt fixing operation unit has been provided on the back side (rear side) of the main body tilt unit that tiltably supports the cutting machine main body. The main body tilt unit is provided behind the turntable. That is, the tilt fixing operation unit described in Patent Document 1 has been provided at a position far from the user located in front of the desktop cutting machine. Therefore, it has been necessary for the user to extend his hand or move to a position behind the main body tilt unit, and it has been difficult to operate the tilt fixing operation unit in some cases.

[0004] The desktop cutting machine described in Patent Document 2 is provided with a tilting fixing operation part in front of a slide bar extending forward from a main body tilting part. The operating force of the tilting fixing operation part is transmitted to a screw connecting the main body tilting part and a turntable, for example, via a plurality of gears. Alternatively, the operating force of the tilting fixing operation part is transmitted to a screw connecting the main body tilting part and the turntable, for example, via a driving pulley, a driven pulley, and a belt stretched between them. Therefore, since the configuration of the tilting fixing operation mechanism is complicated and the number of parts increases, there is room for improvement.

[0005] The desktop cutting machine described in Patent Document 3 is provided with a tilting fixing operation part on a table extension part extending forward from a turntable. This tilting fixing operation part is provided in front of a turntable fixing operation part that can fix the turntable at a predetermined angle (miter angle) in the horizontal direction. The turntable fixing operation part also functions as a gripping part when rotating the turntable in the left - right direction. However, this tilting fixing operation part and the turntable fixing operation part are provided at positions deviated from the center in the left - right direction of the table extension part. That is, the cutting edge surface of the cutting tool and the turntable fixing operation part are displaced from each other in the left - right direction. Therefore, when adjusting the miter angle of the turntable, for example, it may be difficult to align the cutting edge surface of the cutting tool with the scribe line attached to the material to be cut. Also, when rotating the turntable by gripping the turntable fixing operation part, it is difficult to operate without gripping the tilting fixing operation part located in front. When gripping the tilting fixing operation part together with the turntable fixing operation part, there is a risk of accidentally operating the tilting fixing operation part. Also, it is necessary to make the knob of the tilting fixing operation part thinner than the knob of the turntable fixing operation part, and there may be a case where it is difficult to transmit the operating force of the tilting fixing operation part to the main body tilting part at the rear.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] An object of the present invention is to provide a desktop cutting machine capable of performing inclined cutting and having an operationally good tilting and fixing operation unit.

Means for Solving the Problems

[0008] According to one feature of the present disclosure, a desktop cutting machine includes a base, a turntable, a cutting machine body, and a turntable fixing mechanism. The turntable is horizontally rotatably supported on the base. The cutting machine body is provided above the turntable and rotatably supports a cutting tool. The turntable fixing mechanism can fix the turntable to the base. The desktop cutting machine includes a main body tilting unit and a tilting fixing mechanism. The main body tilting unit is provided behind the turntable and supports the cutting machine body so as to be tiltable in the left-right direction. The tilting fixing mechanism can fix the tilting of the cutting machine body in the left-right direction. The turntable fixing mechanism includes a rotatable turntable fixing operation unit and a turntable fixing member. The turntable fixing member can fix the turntable to the base by rotating the turntable fixing operation unit. The turntable fixing operation unit is disposed in front of the front surface of the turntable, below the upper surface of the turntable, and at the center in the left-right direction of the turntable. The tilting fixing mechanism includes a rotatable tilting fixing operation unit. The rotation axis of the tilting fixing operation unit is provided coaxially with the rotation axis of the turntable fixing operation unit. The tilting fixing operation unit is provided in front of the front surface of the turntable and behind the turntable fixing operation unit.

[0009] Therefore, the turntable fixing operation unit and the tilting fixing operation unit are located in front of the bench cutting machine and are easy for the user working there to operate. That is, while maintaining high operability of the turntable fixing operation unit, the operability of the tilting fixing operation unit can be improved. Also, the turntable fixing operation unit, which is operated more frequently, is provided in front of the tilting fixing operation unit and is closer to the user located in front of the bench cutting machine. Therefore, it is possible to prevent the tilting fixing operation unit from being accidentally operated instead of the turntable fixing operation unit. Further, the turntable fixing operation unit also functions as an operation unit that the user grips when rotating the turntable horizontally. In this case, since the turntable fixing operation unit is located farther from the rotation center of the turntable, it is easy to grip the turntable fixing operation unit and rotate the turntable.

[0010] According to another feature of the present disclosure, the tilting fixing mechanism includes a tilting fixing transmission shaft that extends in the front-rear direction from the front part of the turntable to the main body tilting part. The tilting fixing transmission shaft is provided between the rotation center and the left end of the turntable, or between the rotation center and the right end of the turntable.

[0011] Therefore, avoiding the rotation axis of the turntable, the tilting fixing transmission shaft can be provided in the empty space below the turntable. Therefore, the axial force and rotational force transmitted to the tilting fixing transmission shaft are hardly obstructed, and it is easy to transmit the operating force of the tilting fixing operation unit to the main body tilting part.

[0012] According to another feature of the present disclosure, the bench cutting machine includes a positive block mechanism for positioning the turntable at a predetermined rotation angle. The tilting fixing transmission shaft is arranged side by side with the turntable fixing member in the left-right direction. The positive block mechanism is located below the turntable fixing member.

[0013] Therefore, the turntable fixing mechanism and the tilting fixing mechanism can be compactly arranged in the vertical direction. Further, a positive block mechanism can be arranged below the turntable fixing member made empty by the compactification in the vertical direction. Thereby, the turntable fixing mechanism, the tilting fixing mechanism, and the positive block mechanism can be arranged in the minimum space below the table surface of the turntable while maintaining the operability.

[0014] According to another feature of the present disclosure, the tilting fixing mechanism includes a rotating rod. The rotating rod is rotatable in the front-rear direction, one side thereof can abut against the tilting fixing operation portion, and the other side is connected to the tilting fixing transmission shaft. The tilting fixing operation portion includes a screw shaft portion that displaces the rotated tilting fixing operation portion in the front-rear direction. By displacing the tilting fixing operation portion rearward by the screw shaft portion, the rotating rod that abuts against the tilting fixing operation portion rotates to generate a pulling force forward on the tilting fixing transmission shaft. By the pulling force, the main body tilting portion is pressed against the turntable and fixed.

[0015] Therefore, the tilting fixing mechanism can have a simple structure. Thereby, the tilting fixing mechanism can be provided compactly. Further, the tilting fixing mechanism is easy to maintain or maintenance-free, and it is easy to maintain the operability of the tilting fixing operation portion.

[0016] According to another feature of the present disclosure, the tilting fixing mechanism includes a reduction gear portion composed of a driving side gear provided on the tilting fixing operation portion and a driven side gear provided on the tilting fixing transmission shaft. A screw shaft portion is provided at the rear portion of the tilting fixing transmission shaft. A nut is attached to the screw shaft portion. By rotating the tilting fixing operation portion, the tilting fixing transmission shaft rotates about its axis via the reduction gear portion, and by tightening the screw shaft portion and the nut, the main body tilting portion is pressed against the turntable and fixed.

[0017] Therefore, the screw shaft portion and the nut can be tightened with a large torque without increasing the size of the tilting fixing mechanism in the left-right direction. Thereby, the tilting fixing operation portion can be operated with a relatively small torque.

[0018] According to another feature of the present disclosure, the desktop cutting machine has a support portion that supports the tilting fixed transmission shaft with respect to the turntable. The body tilting portion is fixed by sandwiching the body tilting portion and the turntable between the support portion and the nut. Therefore, the axial force (torque) for fixing the body tilting portion acts between the support portion and the nut. Therefore, no axial force is generated on the tilting fixed transmission shaft in front of the support portion. Thereby, the body tilting portion can be fixed without applying a load to the turntable.

[0019] According to another feature of the present disclosure, a thrust needle bearing is provided in the support portion. Therefore, a large axial force of the tilting fixed transmission shaft can be received by the thrust needle bearing. Thereby, the body tilting portion can be fixed to the turntable with a large axial force.

[0020] According to another feature of the present disclosure, the body tilting portion is tiltable in the left - right direction about the left - right tilting support shaft. The nut is in a fan - shape adapted to an arc shape centered on the left - right tilting support shaft. Therefore, the nut can smoothly move relative to the body tilting portion in an arc shape about the left - right tilting support shaft. Therefore, the body tilting portion can be smoothly tilted left and right. Further, the nut can restrict the rotation about the axis of the tilting fixed transmission shaft on the inner peripheral side surface or the outer peripheral side surface of the fan - shape. Therefore, a large axial force can be received by the nut. Thereby, the body tilting portion can be fixed with a large axial force.

[0021] According to another feature of the present disclosure, a rear cover is provided behind the body tilting portion. Therefore, by covering the periphery of the tilting fixed transmission shaft and the like with the rear cover, the intrusion of chips and the like can be prevented. Thereby, the loss of axial force due to the intervention of chips and the like can be suppressed. Thereby, the body tilting portion can be fixed with a large axial force. Also, by preventing the intrusion of chips and the like, the body tilting portion can be smoothly tilted left and right.

[0022] According to another feature of the present disclosure, a front cover is provided on the bottom surface of the reduction gear unit. Therefore, it is possible to prevent the intrusion of chips and the like into the reduction gear unit. As a result, the rotation of the tilting fixing operation unit can be more reliably transmitted to the rear portion of the tilting fixing transmission shaft. Thereby, the fixing operation of the main body tilting unit becomes smooth.

Brief Description of the Drawings

[0023]

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Mode for Carrying Out the Invention

[0024] [First Embodiment] Next, a first embodiment of the present invention will be described with reference to FIGS. 1 to 14. In this embodiment, a table saw 1 called a slide miter saw is exemplified. As shown in FIG. 1, the table saw 1 includes a base 2 placed on a table, a floor, etc., a turntable 4 for placing a material to be cut, and a cutting machine body 10. On the upper side of the base 2, the turntable 4 is supported so as to be rotatable in the horizontal direction. Auxiliary table portions 3 are provided on both side portions of the base 2, respectively. A circular cutting tool 11 called a chip saw is rotatably supported by the cutting machine body 10. The turntable 4 has a table extension portion 5 extending along the cutting edge direction of the cutting tool 11. In the following description, the direction in which the pair of auxiliary table portions 3 are provided is defined as the left-right direction, and the side on which the table extension portion 5 is disposed is defined as the front side. The user performs a cutting operation while positioned on the front side of the table saw 1. The front-back, up-down, left-right directions of the members and the configuration are defined with reference to the user.

[0025] As shown in FIG. 7, the turntable 4 is rotatable about a rotation support shaft 2a at the center of the base 2 as a rotation center. The table upper surface 4a of the turntable 4 is substantially circular in plan view. As shown in FIG. 3, the table upper surface 4a is provided on a horizontal plane. The upper surface of the auxiliary table portion 3 is horizontally provided at substantially the same height as the table upper surface 4a. A cutting edge plate 5a is provided on the upper surface of the table extension portion 5. The cutting edge plate 5a is horizontally provided at substantially the same height as the table upper surface 4a. As shown in FIG. 1, a notch-shaped groove hole 5b extending along the cutting edge surface of the cutting tool 11 is provided at the center of the cutting edge plate 5a.

[0026] As shown in FIG. 1, an adjustment bolt 48 that supports the table extension portion 5 from below is provided at the lower portion of the table extension portion 5. The adjustment bolt 48 is supported by the table extension portion 5 and is movable up and down by a screw operation. The adjustment bolt 48 moves downward by operating in the screw loosening direction. When the lower end of the adjustment bolt 48 abuts against the mounting surface of the table saw 1, the adjustment bolt 48 supports the table extension portion 5 so that the height can be adjusted, and also eliminates the looseness during installation.

[0027] As shown in FIG. 1, on the upper sides of the turntable 4 and the auxiliary table portion 3, a wall-shaped positioning fence 6 extending in the left-right direction and upward is provided. The positioning fence 6 is detachably supported on a fence base portion 6b that is supported by the auxiliary table portion 3 and extends in the left-right direction. As shown in FIGS. 7 and 8, a positioning surface 6a, which is the front surface of the positioning fence 6, is located on a vertical plane passing through the rotation support shaft 2a. The workpiece to be cut and placed on the table upper surface 4a is positioned in the front-rear direction by abutting against the positioning surface 6a. In front of the table upper surface 4a of the base 2, an arc-shaped mitre scale plate 7 centered on the rotation support shaft 2a is provided.

[0028] As shown in FIG. 3, the mitre scale plate 7 is provided so as to extend horizontally below the table upper surface 4a. As shown in FIG. 7, a plurality of groove-shaped positioning recesses 7a extending in the radial direction are provided in the mitre scale plate 7. The positioning recesses 7a are provided at predetermined angular intervals in the circumferential direction of the mitre scale plate 7. The tip of a positioning pin 46a (see FIG. 10), which will be described later, can enter the positioning recesses 7a. As shown in FIG. 1, the mitre scale plate 7 is fixed to the base 2 by fixing screws 7b. The holes into which the fixing screws 7b are inserted are elongated holes. By loosening the fixing screws 7b and moving the mitre scale plate 7 in the left-right direction, the angle between the positioning fence 6 and the cutting tool 11 can be finely adjusted. For example, if the positioning pin 46a (see FIG. 10) is inserted into the positioning recess 7a 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 performed during the production process of the product.

[0029] As shown in FIG. 1, an arm support portion 4b is provided at the rear portion of the turntable 4. A main body support arm (main body tilting portion) 50 extending substantially upward is provided on the rear side of the arm support portion 4b. The main body support arm 50 is supported so as to be tiltable in the left - right direction with respect to the arm support portion 4b about a left - right tilting support shaft 50a (see FIG. 4) extending in the front - rear direction. At the upper portion of the main body support arm 50, a pair of upper and lower slide bars 51 extending forward are provided. The slide bars 51 extend along the extending direction of the table extension portion 5. A main body support portion 14 connected to the cutting machine main body 10 is slidably attached to the slide bars 51 in the front - rear direction. By sliding the main body support portion 14 in the front - rear direction, it is possible to cut, for example, a wide workpiece placed on the table upper surface 4a.

[0030] As shown in FIG. 1, a cutting tool 11 having a cutting edge extending along the front - rear direction is rotatably attached to the cutting machine main body 10. The cutting machine main body 10 has an upper and lower swing support shaft 10a with an axial direction extending in the left - right direction behind the cutting tool 11. The cutting machine main body 10 is swingable in the up - down direction about the upper and lower swing support shaft 10a. By swinging the cutting machine main body 10 downward, the cutting tool 11 can be made to cut into the workpiece placed on the table upper surface 4a.

[0031] As shown in FIGS. 5 and 6, by tilting the main body support arm 50 in the left - right direction, the cutting tool 11 (see FIG. 3) provided on the cutting machine main body 10 can be tilted up to, for example, 45° in each of the left - right directions. Thereby, so - called inclined cutting can be performed on the workpiece placed on the table upper surface 4a (see FIG. 4). A maximum tilt angle switching lever 52 is provided at the lower rear side of the main body support arm 50. By operating the maximum tilt angle switching lever 52, the maximum tilt angle of the cutting tool 11 in the left - right direction can be switched, and for example, the cutting tool 11 can be tilted up to about 48° at most in each of the left - right directions. An arc - shaped hole 50b penetrating in the front - rear direction about the left - right tilting support shaft 50a is provided at the lower portion of the main body support arm 50. A transmission shaft 63 described later projects from the front to the rear into the arc - shaped hole 50b.

[0032] As shown in Fig. 1, the cutting machine main body 10 includes a fixed cover 12 and a movable cover 13. The fixed cover 12 covers the upper half circumference range of the cutting tool 11. The movable cover 13 can cover the lower half circumference range 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 rotates in the closing position direction (clockwise direction in Fig. 1), and the lower half circumference range of the cutting tool 11 is covered. When the cutting machine main body 10 is swung downward, the movable cover rotates in the opening position direction (counterclockwise direction in Fig. 1), and the lower half circumference range of the cutting tool 11 is exposed. Thereby, the workpiece placed on the upper surface 4a of the table can be cut by the exposed cutting tool 11.

[0033] As shown in Fig. 1, a dust collection guide 15 is provided on the lower side of the rear part of the fixed cover 12. The dust collection guide 15 has a substantially C-shaped wall shape standing upright in the vertical direction in a posture where the cutting machine main body 10 is moved to the lower end position. The substantially C-shaped shape of the dust collection guide 15 in plan view is open at the front side. The dust collection guide 15 suppresses the chips generated by cutting the workpiece from scattering to the rear or both left and right sides of the cutting tool 11. The upper part of the dust collection guide 15 communicates with a dust collection hose 17a extending from the rear part of the cutting machine main body 10 to the right.

[0034] As shown in Fig. 1, a cylindrical rear dust collection port 16 with an open front is provided at the front part of the main body support arm 50. The rear dust collection port 16 suppresses the scattering of chips further rearward than the dust collection guide 15. The rear part of the rear dust collection port 16 communicates with a dust collection hose 17b extending from the main body support arm 50 to the right. As shown in Fig. 2, the dust collection hose 17 (17a, 17b) can be connected to a dust collector 18 installed separately from the bench cutting machine 1. By starting the dust collector 18, the chips scattered around the dust collection guide 15 and the rear dust collection port 16 can be sucked into the dust collector 18 through the dust collection hoses 17a and 17b.

[0035] As shown in FIG. 2, the cutting machine main body 10 includes a motor housing 20 and a handle portion 30. The motor housing 20 and the handle portion 30 are provided on the right side of the fixed cover 12 and the movable cover 13. The motor housing 20 has a substantially cylindrical shape and is inclined upward and to the right with respect to the fixed cover 12. An air intake port 20a capable of taking in outside air is provided above and to the right of the motor housing 20. An electric motor 21 is housed in the motor housing 20. The electric motor 21 is housed such that the motor shaft extends along the longitudinal direction of the substantially cylindrical motor housing 20. For example, a DC brushless motor is used for the electric motor 21.

[0036] As shown in FIG. 3, the cutting tool 11 is integrally attached to a spindle (not shown) that extends in the left-right direction and is rotatably supported by the cutting machine main body 10. A speed reduction gear portion is interposed between the spindle and the motor shaft of the electric motor 21. The rotation of the motor shaft is transmitted to the spindle via the speed reduction gear portion, causing the cutting tool 11 to rotate.

[0037] As shown in FIG. 3, the motor housing 20 is arranged in a posture that is not parallel to the upper surface of the turntable 4 but inclined upward and to the right with the cutting tool 11 positioned at a right-angle cutting position orthogonal to the upper surface of the turntable 4. Therefore, the angle at which the cutting machine main body 10 is tilted in the left-right direction can be set larger toward the right. For example, compared to a form in which the motor housing 20 is arranged parallel to the upper surface of the turntable 4, the cutting machine main body 10 can be tilted more to the right.

[0038] As shown in FIG. 2, a battery mounting portion 25 is provided behind the motor housing 20. The mounting surface of the battery mounting portion 25 faces rearward and extends generally along the longitudinal direction of the motor housing 20. As shown in FIG. 3, the battery 26 can be mounted on the battery mounting portion 25 by sliding it along the longitudinal direction of the motor housing 20. The battery 26 has a substantially rectangular box shape. The battery 26 is, for example, a lithium-ion battery with an output voltage of 36V. The battery 26 is rechargeable repeatedly and can be charged with a charger separately prepared by removing it from the battery mounting portion 25. The battery 26 can be reused as a power source with other rechargeable power tools such as a screwdriver or an electric drill.

[0039] As shown in FIG. 1, at the front part of the handle portion 30, a loop-shaped main handle 31 extending in the front-rear direction is provided. Inside the main handle 31, a switch lever 33 is provided. The switch lever 33 is provided so that it can be pulled by hooking a finger while the user holds the main handle 31. When the switch lever 33 is pulled, the electric motor 21 starts and the cutting tool 11 rotates. At the upper part of the main handle 31, a lock-off button 32 is provided. By pressing the lock-off button 32, the pulling operation of the switch lever 33 becomes possible. Thereby, an unexpected start of the electric motor 21 is avoided.

[0040] As shown in FIG. 1, the handle portion 30 includes a carrying handle 34 behind the main handle 31. The carrying handle 34 has a loop shape extending in the front-rear direction and generally in the horizontal direction with the cutting machine body 10 moved to the lower end position. With the cutting machine body 10 locked in the lower end position, the user can carry the table saw 1 by gripping the carrying handle 34.

[0041] As shown in FIG. 1, the handle portion 30 includes a concave adapter mounting portion 35 behind the carrying handle 34. A communication adapter 36 can be inserted and mounted on the adapter mounting portion 35. The communication adapter 36 can perform wireless communication with other accessory equipment. By wireless communication, the startup operation and stop operation of the desktop cutting machine 1 and the accessory equipment can be interlocked. By the communication adapter 36, for example, the dust collector 18 (see FIG. 2) installed separately from the desktop cutting machine 1 and the desktop cutting machine 1 can be interlocked.

[0042] As shown in FIG. 2, a turntable fixing mechanism 40 and a positive block mechanism 45 are provided at the lower part of the table extension portion 5. As shown in FIG. 10, the turntable fixing mechanism 40 includes a grip portion (turntable fixing operation portion) 41 and a fixing rod (turntable fixing member) 42. The fixing rod 42 extends in the longitudinal direction (front-rear direction) of the table extension portion 5. As shown in FIG. 12, the fixing rod 42 is disposed at the center in the left-right direction inside the table extension portion 5. As shown in FIG. 10, the fixing rod 42 is supported by being screwed into a screw hole 5c provided inside the table extension portion 5. The front portion of the fixing rod 42 protrudes forward from the front surface of the table extension portion 5. The grip portion 41 is integrally connected to the front portion of the fixing rod 42. As shown in FIGS. 9 and 10, the grip portion 41 is disposed at the center in the left-right direction of the table extension portion 5 in front of the front surface of the table extension portion 5 so as not to protrude above the upper surface of the table extension portion 5. The grip portion 41 has an uneven shape on the peripheral edge so that the user can easily grip and rotate it. When the user grips the grip portion 41 and rotates it around the axis of the fixing rod 42, the fixing rod 42 also rotates integrally with the grip portion 41. The fixing rod 42 that rotates around the axis is displaced in the front-rear direction by screwing in the screw hole 5c.

[0043] As shown in FIG. 10, the base 2 includes a horizontal plate portion 2b that extends horizontally. The horizontal plate portion 2b extends toward the rotation support shaft 2a at substantially the same height as the mit scale plate 7. A clamping member 43 is provided on the rear side of the fixed rod 42. The clamping member 43 has a substantially L-shaped configuration when viewed in the left-right direction. The clamping member 43 is provided with a rotation shaft 43a that extends in the left-right direction near the substantially L-shaped bent portion. The clamping member 43 is supported by the table extension portion 5 so as to be rotatable about the rotation shaft 43a. The clamping member 43 has a rod contact portion 43b that can contact the rear end of the fixed rod 42 at one end of the L-shaped configuration, and a clamping portion 43c that can contact the lower surface of the horizontal plate portion 2b at the other end of the L-shaped configuration.

[0044] When the fixed rod 42 is displaced rearward and contacts the rod contact portion 43b, the rod contact portion 43b is pushed rearward. At this time, as the clamping member 43 rotates about the rotation shaft 43a, the clamping portion 43c is displaced upward. The upwardly displaced clamping portion 43c contacts the lower surface of the horizontal plate portion 2b and clamps the horizontal plate portion 2b between the table extension portion 5. As a result, the table extension portion 5 and the clamping member 43 become immovable in the left-right direction with respect to the horizontal plate portion 2b. Therefore, the rotation of the table extension portion 5 and the turntable 4 integrated with the table extension portion 5 with respect to the base 2 is locked.

[0045] When the fixed rod 42 is displaced forward, the force pushing the rod contact portion 43b rearward becomes smaller (or disappears). At this time, as the clamping member 43 rotates about the rotation shaft 43a, the clamping portion 43c is displaced downward. When the clamping portion 43c is displaced downward, the clamping of the horizontal plate portion 2b by the clamping member 43 and the table extension portion 5 is released. As a result, the table extension portion 5 and the clamping member 43 become movable in the left-right direction with respect to the horizontal plate portion 2b. Therefore, the table extension portion 5 and the turntable 4 are rotatable about the rotation support shaft 2a with respect to the base 2.

[0046] As shown in Fig. 9, the positive block mechanism 45 includes an unlocking lever 46 and a positioning pin 46a. The unlocking lever 46 is disposed forward of the front surface of the table extension portion 5 and to the left of the grip portion 41 and a tilting fixing operation portion 61 described later. As shown in Fig. 10, the positioning pin 46a is provided below the fixed rod 42 and extends in the front-rear direction along the longitudinal direction of the fixed rod 42. As shown in Fig. 10, the front and rear portions of the positioning pin 46a are supported by the lower portion of the table extension portion 5. The positioning pin 46a is rotatable about its axis and displaceable in the front-rear direction. The positioning pin 46a is provided at substantially the same height as the mit scale plate 7. The tip (rear end) of the positioning pin 46a can enter the positioning recess 7a. As shown in Fig. 14, the front end of the positioning pin 46a is connected to the base of the unlocking lever 46. The unlocking lever 46 is operable in the vertical direction so as to rotate about the axis of the positioning pin 46a.

[0047] As shown in Fig. 2, a pin support portion 47 is attached to the lower portion of the table extension portion 5. As shown in Fig. 14, the pin support portion 47 includes an insertion hole 47a penetrating in the front-rear direction and a pair of lead surfaces 47b provided on the side of the insertion hole 47a. The pair of lead surfaces 47b are provided symmetrically with respect to the center of the insertion hole 47a. The lead surface 47b has a fan shape with the center of the insertion hole 47a as the arc center when viewed from the front. The lead surface 47b has a spiral lead surface provided therebetween, with one end side in the circumferential direction of the fan shape positioned forward and the other end side in the circumferential direction of the fan shape positioned rearward. In the case of the left (right) lead surface 47b shown in Fig. 14, the lower (upper) end of the fan shape is positioned forward, and the lead surface is provided on the lead surface where the upper (lower) end of the fan shape is positioned rearward.

[0048] As shown in Fig. 14, a pair of engagement pins 46b are provided at approximately the center in the front-rear direction of the positioning pin 46a. The pair of engagement pins 46b extend in opposite directions to each other in a direction orthogonal to the axial direction of the positioning pin 46a. The pair of engagement pins 46b are arranged to enter the respective pair of lead surface portions 47b with the positioning pin 46a passed through the insertion hole 47a. The tip of the engagement pin 46b abuts against the lead surface of the lead surface portion 47b.

[0049] As shown in Fig. 13, the positioning pin 46a includes a compression spring 46c on the front side of the engagement pin 46b, and further includes a washer 46d on the front side of the compression spring 46c. As shown in Fig. 10, the front surface of the washer 46d abuts against a spring receiving portion 5e provided at the lower part of the table extension portion 5. The spring receiving portion 5e restricts the forward movement of the front end of the compression spring 46c.

[0050] Push down and operate the unlocking lever 46 shown in Fig. 13. As a result, the pair of engagement pins 46b rotate counterclockwise about the axis of the positioning pin 46a. The tip of the engagement pin 46b rotates while maintaining the contact state with the lead surface of the lead surface portion 47b. Therefore, the engagement pin 46b is displaced forward along the helical lead surface inclined forward. Accordingly, the positioning pin 46a, which is integral with the engagement pin 46b, is displaced forward against the biasing force of the compression spring 46c. At this time, as shown in Fig. 10, the rear end portion of the positioning pin 46a displaced forward is displaced to a position where the engagement with the positioning recess 7a can be released. Therefore, when the grip portion 41 is rotated to release the rotation lock state of the turntable 4 by the turntable fixing mechanism 40, the turntable 4 can be freely rotated in the left-right direction.

[0051] The unlocking lever 46 shown in FIG. 13 is pulled upward from the lower position. As a result, the pair of engagement pins 46b rotate clockwise about the axis of the positioning pin 46a. The tip of the engagement pin 46b rotates while maintaining the contact state with the lead surface of the lead surface portion 47b. Therefore, the engagement pin 46b can be displaced rearward along the lead surface. Accordingly, the positioning pin 46a, which is integral with the engagement pin 46b, is displaced rearward by the biasing force of the compression spring 46. The rear end portion of the positioning pin 46a abuts against the outer peripheral edge of the micrometer scale plate 7. The positioning pin 46a enters any one of the positioning recesses 7a provided on the outer peripheral edge of the micrometer scale plate 7. Thus, the turntable 4 is positioned at a predetermined micrometer angle position corresponding to the positioning recess 7a by the positive block mechanism 45.

[0052] As shown in FIG. 1, a tilting fixing mechanism 60 for holding the main body support arm 50 in a tiltable manner in the left-right direction is provided at the lower part of the table extension part 5. As shown in FIG. 13, the tilting fixing mechanism 60 includes a tilting fixing operation part 61, a rotating rod 62, and a transmission shaft (tilting fixing transmission shaft) 63. The tilting fixing operation part 61 is rotatable about an axis extending in the front-rear direction. The tilting fixing operation part 61 has an uneven shape on the peripheral edge so that it can be easily gripped and rotated by the user. The uneven shape of the tilting fixing operation part 61 is formed in a pattern different from the uneven shape of the grip part 41. Therefore, when the user grips it, the tilting fixing operation part 61 and the grip part 41 can be easily distinguished, and thus, for example, an erroneous operation such as operating the tilting fixing operation part 61 and the grip part 41 simultaneously can be prevented. A screw shaft part 61a extending rearward is provided at the rear part of the tilting fixing operation part 61.

[0053] As shown in FIG. 10, the tilting fixing operation part 61 is provided in front of the front surface of the table extension part 5 and behind the grip part 41. The screw shaft part 61a is screwed with a screw hole 5d provided on the front surface of the table extension part 5. An insertion hole 61c penetrating in the front-rear direction is provided at the center of the tilting fixing operation part 61 and the screw shaft part 61a. The fixing rod 42 enters the insertion hole 61c. The tilting fixing operation part 61 is rotatable around the axis of the fixing rod 42. That is, the rotation axis of the tilting fixing operation part 61 is coaxial with the rotation axis of the grip part 41. By being rotationally operated, the tilting fixing operation part 61 is displaced in the front-rear direction by the screwing of the screw shaft part 61a and the screw hole 5d.

[0054] As shown in FIG. 13, the rotating rod 62 extends substantially in the left-right direction and has a rod rotation axis 62a extending in the up-down direction at substantially the center in the left-right direction. On the front surface on the left side of the rod rotation axis 62a of the rotating rod 62, the rod contact part 61b at the rear end of the screw shaft part 61a is in contact. On the left side of the rod rotation axis 62a of the rotating rod 62, the front end part of a transmission shaft 63 extending in the front-rear direction is connected. The connecting part 63a connecting the transmission shaft 63 and the rotating rod 62 has a shaft shape extending in the up-down direction. As shown in FIG. 12, the rotating rod 62 is rotatably supported in the front-rear direction inside the table extension part 5 via the rod rotation axis 62a.

[0055] As shown in FIG. 12, the transmission shaft 63 is arranged side by side on the right side of the fixing rod 42. As shown in FIG. 9, the transmission shaft 63 is provided on the left side of the right end part of the table extension part 5 and extends in the front-rear direction on the right side of the rotation support shaft 2a. As shown in FIG. 11, the rear part of the transmission shaft 63 penetrates through the arm support part 4b and the main body support arm 50. A screw shaft part 63b is provided at the rear end part of the transmission shaft 63 protruding to the rear side of the arc-shaped hole 50b of the main body support arm 50. A nut 64 is fastened to the screw shaft part 63b. A washer 64a is interposed between the nut 64 and the rear surface of the main body support arm 50.

[0056] As shown in FIG. 13, when the tilting fixing operation unit 61 is displaced rearward, the left-side portion of the rotating rod 62 from the rod rotation axis 62a is pushed by the rod contact portion 61b and displaced rearward. Since the rotating rod 62 rotates about the axis of the rod rotation axis 62a, the right-side portion of the rotating rod 62 from the rod rotation axis 62a is pulled forward. Accordingly, the transmission shaft 63 connected to the right-side portion of the rotating rod 62 is pulled forward. As shown in FIG. 11, the nut 64 is pulled forward by the transmission shaft 63. Thereby, the front portion of the main body support arm 50 is pressed against the rear portion of the arm support portion 4b. Thus, the main body support arm 50 is fixed to the arm support portion 4b and positioned at a predetermined left-right inclination angle.

[0057] As shown in FIG. 13, when the tilting fixing operation unit 61 is displaced forward, the pressing force of the rod contact portion 61b that presses the left-side portion of the rotating rod 62 rearward from the rod rotation axis 62a is released. Thereby, the pulling force forward is released in the right-side portion of the rotating rod 62 from the rod rotation axis 62a. Accordingly, as shown in FIG. 11, since the pulling force forward in the transmission shaft 63 and the nut 64 is also released, the pressing force that presses the main body support arm 50 against the arm support portion 4b is released. Thus, the main body support arm 50 can be tilted left and right about the axis of the left-right tilting support shaft 50a (see FIG. 10) with respect to the arm support portion 4b. The arc-shaped hole 50b is displaced about the axis of the left-right tilting support shaft 50a with respect to the rear end portion of the transmission shaft 63 when the main body support arm 50 tilts left and right. Thereby, it is possible to prevent the transmission shaft 63 protruding rearward from the main body support arm 50 from interfering with the left-right tilting of the main body support arm 50.

[0058] According to the desktop cutting machine 1 of the first embodiment described above, the turntable 4 has a table extension portion extending forward and is horizontally rotatably supported on the base 2. The cutting machine main body 10 is provided above the turntable 4 and rotatably supports the cutting tool 11. The turntable fixing mechanism 40 can fix the turntable 4 to the base 2. The main body support arm 50 is provided behind the arm support portion 4b of the turntable 4 and supports the cutting machine main body 10 so as to be tiltable in the left-right direction. The tilt fixing mechanism 60 can fix the left-right tilt of the cutting machine main body 10. The turntable fixing mechanism 40 includes a rotatable grip portion 41 and a fixing rod 42. The fixing rod 42 can fix the turntable 4 to the base 2 by rotating the grip portion 41. The grip portion 41 is disposed in front of the front surface of the table extension portion 5, below the upper surface of the turntable 4, and at the center in the left-right direction of the table extension portion 5. The tilt fixing mechanism 60 includes a rotatable tilt fixing operation portion 61. The rotation axis of the tilt fixing operation portion 61 is provided coaxially with the rotation axis of the grip portion 41 and the fixing rod 42. The tilt fixing operation portion 61 is provided in front of the front surface of the table extension portion 5 and behind the grip portion 41.

[0059] Therefore, the grip portion 41 and the tilt fixing operation portion 61 are located in front of the desktop cutting machine 1 and are easy for the user working there to operate. That is, the operability of the tilt fixing operation portion 61 can be improved while maintaining the high operability of the grip portion 41. In addition, the grip portion 41, which is operated more frequently, is provided in front of the tilt fixing operation portion 61 and is closer to the user located in front of the desktop cutting machine 1. Therefore, it is possible to prevent the tilt fixing operation portion 61 from being accidentally operated instead of the grip portion 41. Further, the grip portion 41 also functions as an operation portion that the user grips when horizontally rotating the turntable 4. In this case, since the grip portion 41 is at a position farther from the rotation support shaft 2a, it is easy to grip the grip portion 41 and rotate the turntable 4.

[0060] Also, according to the desktop cutting machine 1, the tilting fixing mechanism 60 includes a transmission shaft 63 that extends in the front-rear direction from the front part of the table extension 5 to the main body support arm 50. The transmission shaft 63 is provided between the rotary support shaft 2a and the right end of the table extension 5.

[0061] Therefore, the transmission shaft 63 can be provided in the empty space below the turntable 4 and the table extension 5 while avoiding the rotary support shaft 2a. Thus, the axial force transmitted to the transmission shaft 63 is hardly hindered, and the operating force of the tilting fixing operation unit 61 can be easily transmitted to the main body support arm 50.

[0062] Also, according to the desktop cutting machine 1, a positive block mechanism 45 for positioning the turntable 4 at a predetermined rotation angle is provided. The transmission shaft 63 extends in the front-rear direction side by side with the right side of the fixed rod 42. The positioning pin 46a of the positive block mechanism 45 is located below the fixed rod 42.

[0063] Therefore, the fixed rod 42, the transmission shaft 63, and the positioning pin 46a are arranged in a substantially right-angled triangle shape when viewed from the front. Thereby, the turntable fixing mechanism 40 and the tilting fixing mechanism 60 can be arranged compactly in the vertical direction. Further, the positioning pin 46a of the positive block mechanism 45 can be arranged below the fixed rod 42 made empty by the compactification in the vertical direction. Thus, the turntable fixing mechanism 40, the tilting fixing mechanism 60, and the positive block mechanism 45 can be arranged in the minimum space below the upper surface of the table extension 5 while maintaining operability.

[0064] Further, according to the desktop cutting machine 1, the tilting fixing mechanism 60 includes a rotating rod 62 inside the table extension 5. The rotating rod 62 is rotatable in the front-rear direction, the left side portion thereof can abut against the rod abutting portion 61b of the tilting fixing operation portion 61, and the right side portion thereof is connected to the transmission shaft 63 via the connecting portion 63a. The tilting fixing operation portion 61 is provided with a screw shaft portion 61a at the rear for displacing the rotated tilting fixing operation portion 61 in the front-rear direction. By pushing the tilting fixing operation portion 61 backward by the screw shaft portion 61a, the rotating rod 62 rotates around the axis of the rod rotation shaft 62a, and the left side portion of the rotating rod 62 that abuts against the rod abutting portion 61b is pushed backward. As a result, the right side portion of the rotating rod 62 generates a forward pulling force on the transmission shaft 63. The main body support arm 50 pulled forward by the pulling force is pressed and fixed to the rear surface of the arm support portion 4b of the turntable 4.

[0065] Therefore, the tilting fixing mechanism 60 can be simply configured with relatively few components, namely, the tilting fixing operation portion 61, the rotating rod 62, and the transmission shaft 63. Thereby, the tilting fixing mechanism 60 can be provided in a compact manner. Further, the tilting fixing mechanism 60 is easy to maintain or maintenance-free, and it is easy to maintain the operability of the tilting fixing operation portion 61.

[0066] [Second Embodiment] Next, the desktop cutting machine 70 according to the second embodiment of the present invention will be described with reference to FIGS. 15 to 19. As shown in FIG. 15, the desktop cutting machine 70 includes a table extension 71, a positive block mechanism 75, a main body support arm (main body tilting portion) 72, and a tilting fixing mechanism 80 instead of the table extension 5, the positive block mechanism 45, the main body support arm 50, and the tilting fixing mechanism 60 of the desktop cutting machine 1 according to the first embodiment shown in FIG. 9. In the following description, only the configurations different from those of the first embodiment will be described in detail.

[0067] As shown in FIG. 16, a cutting edge plate 71a is provided on the upper surface of the table extension portion 71. A notch-shaped groove hole 71b is provided at the center of the cutting edge plate 71a. A turntable fixing mechanism 40, a positive block mechanism 75, and a tilting fixing mechanism 80 are provided below the table extension portion 71. As shown in FIG. 15, the positive block mechanism 75 includes a lock release lever 76 and a positioning pin 76a. The lock release lever 76 is disposed forward of the front surface of the table extension portion 71 and to the left of the grip portion 41 and a tilting fixing operation portion 81 described later. The lock release lever 76 is integrally connected to the front end of the positioning pin 76a. The lock release lever 76 is operable in the vertical direction so as to rotate about the axis of the positioning pin 76a. As shown in FIG. 16, the positioning pin 76a is provided below the fixed rod 42 and extends in the front-rear direction at substantially the same height as the mit scale plate 7. The positioning pin 76a is supported by the lower portion of the table extension portion 71 and is displaceable in the front-rear direction. A radially projecting flange portion 76c is provided at the front portion of the positioning pin 76a. The table extension portion 71 has a spring receiving portion 71c on the front side of the flange portion 76c. A compression spring 76b is provided between the flange portion 76c and the spring receiving portion 71c. The positioning pin 76a is biased rearward by the compression spring 76b.

[0068] As shown in FIG. 15, a lever guide portion 71d is provided below the table extension portion 71. The lever guide portion 71d has an inclined surface that slopes backward from the front toward the center from the left end side of the table extension portion 71. The unlocking lever 76 is operated in the vertical direction while being in contact with the inclined surface of the lever guide portion 71d. When the unlocking lever 76 is pushed downward, it is displaced forward along the inclined surface of the lever guide portion 71d. As a result, the positioning pin 76a, which is integral with the unlocking lever 76, is displaced forward against the biasing force of the compression spring 76b. Therefore, the rear end portion of the positioning pin 76a is displaced to a position where it can be disengaged from the positioning recess 7a (see FIG. 16). When the unlocking lever 76 is pulled upward, it is displaced backward along the inclined surface of the lever guide portion 71d. The positioning pin 76a is displaced backward together with the lever guide portion 71d by the biasing force of the compression spring 76b. Therefore, the rear end portion of the positioning pin 76a is displaced to a position where it can engage with the positioning recess 7a.

[0069] As shown in FIG. 15, the tilting fixing mechanism 80 includes a tilting fixing operation portion 81, a reduction gear portion 82, and a transmission shaft (tilting fixing transmission shaft) 83. The tilting fixing operation portion 81 is rotatable about an axis extending in the front-rear direction. The tilting fixing operation portion 81 is provided in front of the front surface of the table extension portion 71 and behind the grip portion 41. A drive-side gear 82a of the reduction gear portion 82 is integrally provided at the rear portion of the tilting fixing operation portion 81. As shown in FIG. 16, an insertion hole 81a penetrating in the front-rear direction is provided at the center of the tilting fixing operation portion 81 and the drive-side gear 82a. The fixing rod 42 enters the insertion hole 81a. The tilting fixing operation portion 81 and the drive-side gear 82a are rotatable about the axis of the fixing rod 42. That is, the rotation axis of the tilting fixing operation portion 81 is coaxial with the rotation axis of the grip portion 41.

[0070] As shown in FIG. 15, the speed reduction gear unit 82 includes a driving side gear 82a and a driven side gear 82b. The driven side gear 82b is provided at the front end of a transmission shaft 83 extending in the front-rear direction. The driven side gear 82b is rotatable about the axis of the transmission shaft 83. As shown in FIG. 18, the driven side gear 82b is arranged side by side with the driving side gear 82a on the right side thereof and meshes with the driving side gear 82a. The rotation of the driving side gear 82a is reduced and transmitted to the driven side gear 82b. The reduction ratio of the driving side gear 82a and the driven side gear 82b is, for example, 1:1.5. The transmission shaft 83 is arranged side by side with the fixed rod 42 on the right side. As shown in FIG. 15, the transmission shaft 83 is provided on the left side of the right end portion of the table extension 71 and on the right side of the rotation support shaft 2a. As shown in FIG. 17, the rear portion of the transmission shaft 83 penetrates through the arm support portion 4b and the main body support arm 72. A screw shaft portion 83a is provided at the rear end portion of the transmission shaft 83 protruding rearward from the main body support arm 72. A nut 84 is attached to the screw shaft portion 83a. On the front portion of the nut 84 having a cylindrical cross-section, substantially planar two-sided width portions 84a provided at positions facing each other are formed.

[0071] As shown in FIG. 16, the main body support arm 72 is supported so as to be tiltable in the left-right direction with respect to the arm support portion 4b about a left-right tilt support shaft 72a extending in the front-rear direction. As shown in FIG. 19, an arc-shaped hole 72b and a rotation prevention hole 72c are provided in the lower portion of the main body support arm 72. The arc-shaped hole 72b is an arc-shaped hole penetrating in the front-rear direction with the left-right tilt support shaft 72a as the center. The rotation prevention hole 72c is provided on the front side of the arc-shaped hole 72b and is formed along the arc-shaped hole 72b. The rotation prevention hole 72c is provided with a length in the width direction (radial direction with the left-right tilt support shaft 72a as the center) smaller than that of the arc-shaped hole 72b. As shown in FIG. 17, the shaft portion (front portion) of the nut 84 can enter the arc-shaped hole 72b. Only the two-sided width portion 84a can enter the rotation prevention hole 72c. The rotation of the nut 84 is restricted by the two-sided width portion 84a and the rotation prevention hole 72c.

[0072] As shown in Fig. 15, when the tilting fixing operation part 81 is rotated, the transmission shaft 83 is decelerated via the reduction gear part 82 and rotates around the axis. As shown in Fig. 17, the nut 84 attached to the screw shaft part 83a has its rotation around the axis of the transmission shaft 83 restricted. Therefore, when the transmission shaft 83 is rotated in one direction, the nut 84 is fastened to the screw shaft part 83a. As a result, the main body support arm 72 is pressed toward the arm support part 4b side. Thus, the main body support arm 72 is fixed to the arm support part 4b and positioned at a predetermined left - right inclination angle. When the transmission shaft 83 is rotated in the reverse direction, the fastening between the nut 84 and the screw shaft part 83a is loosened. As a result, the pressing force that presses the main body support arm 72 toward the arm support part 4b side is released. Thus, the main body support arm 72 can tilt left and right around the axis of the left - right tilting support shaft 72a (see Fig. 16) with respect to the arm support part 4b.

[0073] According to the desktop cutting machine 70 of the second embodiment described above, the tilting fixing mechanism 80 includes a reduction gear part 82 composed of a driving - side gear 82a and a driven - side gear 82b. The driving - side gear 82a is provided on the tilting fixing operation part 81. The driven - side gear 82b is provided on the transmission shaft 83. A screw shaft part 83a is provided at the rear part of the transmission shaft 83. A nut 84 is attached to the screw shaft part 83a. By rotating the tilting fixing operation part 81, the transmission shaft 83 rotates via the reduction gear part 82. The nut 84 and the screw shaft part 83a of the transmission shaft 83 are tightened together, and the main body support arm 72 is pressed against the arm support part 4b of the turntable 4. As a result, the main body support arm 72 is fixed to the arm support part 4b.

[0074] Therefore, the nut 84 can be tightened with a large torque without increasing the size of the tilting fixing mechanism 80 in the left - right direction. As a result, the tilting fixing operation part 81 can be operated with a relatively small torque.

[0075] [Third Embodiment] Next, the desktop cutting machine 90 of the third embodiment of the present invention will be described with reference to FIGS. 20 to 27. As shown in FIG. 20, the desktop cutting machine 90 includes a tilting and fixing mechanism 100, a turntable 91, and a main body support arm (main body tilting part) 94 instead of the tilting and fixing mechanism 80, the turntable 4, and the main body support arm 72 of the second embodiment shown in FIG. 17. In the following description, only the configurations different from those of the first and second embodiments will be described in detail.

[0076] As shown in FIG. 20, the turntable 91 has a table extension part 92 extending along the blade surface direction of the cutting tool 11 (see FIG. 1). A cutting edge plate 92a is provided on the upper surface of the table extension part 92. As shown in FIG. 23, a turntable fixing mechanism 40, a positive block mechanism 45, and a tilting and fixing mechanism 100 are provided below the table extension part 92. A spring receiving part 92b protruding downward is provided below the table extension part 92. The spring receiving part 92b restricts the forward movement of a washer 46d biased forward by a compression spring 46c of the positive block mechanism 45.

[0077] As shown in FIG. 20, the turntable 91 has an arm support part 91b behind the horizontal table upper surface 91a. A circular insertion hole 91c penetrating in the front-rear direction is provided below the arm support part 91b. A main body support arm 94 extending substantially upward is provided on the rear side of the arm support part 91b. The main body support arm 94 is supported so as to be tiltable in the left-right direction with respect to the arm support part 91b about a left-right tilting support shaft 94a (see FIG. 26). As shown in FIG. 26, the main body support arm 94 has an arc-shaped hole 94b penetrating in the front-rear direction about the left-right tilting support shaft 94a.

[0078] As shown in Fig. 23, the tilting fixing mechanism 100 includes a tilting fixing operation part 101, a reduction gear part 102, and a transmission shaft (tilting fixing transmission shaft) 103. The tilting fixing operation part 101 is rotatable about an axis extending in the front-rear direction. As shown in Fig. 25, an insertion hole 92c extending in the front-rear direction is provided in the tilting table extension part 92. The shaft part of the tilting fixing operation part 101 enters the insertion hole 92c and is rotatably supported about the axis.

[0079] As shown in Fig. 23, the tilting fixing operation part 101 is provided in front of the front surface of the table extension part 92 and behind the grip part 41 of the turntable fixing mechanism 40. A reduction gear part 102 is provided behind the tilting fixing operation part 101. The reduction gear part 102 includes a driving side gear 102a and a driven side gear 102b. The driving side gear 102a is provided integrally with the rear part of the tilting fixing operation part 101. As shown in Fig. 25, an insertion hole 101a penetrating in the front-rear direction and allowing the fixing rod 42 to enter is provided at the center of the tilting fixing operation part 101 and the driving side gear 102a. The tilting fixing operation part 101 and the driving side gear 102a are rotatable about the axis of the fixing rod 42. That is, the rotation axis of the tilting fixing operation part 101 is coaxial with the rotation axis of the grip part 41 (see Fig. 23).

[0080] As shown in Fig. 23, the driven side gear 102b is provided at the front end of the transmission shaft 103 extending in the front-rear direction. The driven side gear 102b is rotatable about the axis of the transmission shaft 103. The driven side gear 102b is arranged beside the driving side gear 102a on the right side and meshes with the driving side gear 102a. The rotation of the driving side gear 102a is decelerated and transmitted to the driven side gear 102b. The reduction ratio of the driving side gear 102a and the driven side gear 102b is, for example, 1:2.2. As shown in Fig. 25, the transmission shaft 103 is provided on the right side of the fixing rod 42 and on the left side of the right end of the table extension part 92.

[0081] As shown in FIG. 24, a front cover 93 is attached to the lower part of the table extension 92. The front cover 93 covers the driven gear 102b (see FIG. 23) of the speed reduction gear part 102 from below. The lower surface of the table extension 92 has a U-shaped groove extending in the front-rear direction and open downward. The front part of the transmission shaft 103 is supported so as to be rotatable about the axis by being sandwiched from above and below by a pair of U-shaped grooves of the front cover 93 and the table extension 92.

[0082] As shown in FIGS. 21 and 22, a thrust needle bearing 104 and a receiving part (support part) 105 are attached to the rear part of the transmission shaft 103. The thrust needle bearing 104 and the receiving part 105 are support parts of the transmission shaft 103 that position the transmission shaft 103 in the axial direction with respect to the turntable 91 (see FIG. 20). The thrust needle bearing 104 includes a disc-shaped cage 104a and a pair of washers 104b that sandwich the cage 104a from the front and rear. The cage 104a is provided with a plurality of needles 104c arranged at substantially equal intervals in the circumferential direction of the cage 104a and extending in the radial direction of the cage 104a. The transmission shaft 103 includes a receiving part 105 in front of the thrust needle bearing 104. The receiving part 105 is fixed to the rear part of the transmission shaft 103. The receiving part 105 restricts the forward movement of the thrust needle bearing 104 with respect to the transmission shaft 103.

[0083] As shown in FIGS. 21 and 22, the transmission shaft 103 includes a cylindrical sleeve 107 behind the thrust needle bearing 104. A nut 106 is attached to the rear end of the transmission shaft 103. A screw 106c is attached to the transmission shaft 103 via a washer 106d behind the nut 106. The rearward movement of the nut 106 is restricted by fastening the screw 106c to the transmission shaft 103.

[0084] As shown in FIGS. 22 and 26, the nut 106 is fan-shaped when viewed in the front-rear direction. An outer peripheral portion 106a extending in an arc shape is provided on the outer peripheral side surface of the fan-shaped nut 106. An inner peripheral portion 106b extending in an arc shape is provided on the inner peripheral side surface of the fan-shaped nut 106. The outer peripheral portion 106a and the inner peripheral portion 106b each extend with the left-right tilting support shaft 94a as the arc center.

[0085] As shown in FIG. 20, the transmission shaft 103 extends in the front-rear direction and penetrates through the insertion hole 91c and the arc-shaped hole 94b. The thrust needle bearing 104 and the receiving portion 105 are arranged in front of the insertion hole 91c. The rear surface of the thrust needle bearing 104 can abut against the front end of the arm support portion 91b. The sleeve 107 is arranged in the insertion hole 91c. By interposing the sleeve 107 between the transmission shaft 103 and the wall surface of the insertion hole 91c, the transmission shaft 103 can rotate smoothly around the axis within the insertion hole 91c. The nut 106 is arranged behind the arc-shaped hole 94b. Therefore, the thrust needle bearing 104 and the nut 106 sandwich the main body support arm 94 and the arm support portion 91b in the front-rear direction.

[0086] As shown in FIG. 26, the main body support arm 94 has an arc-shaped inner peripheral wall 94c extending with the left-right tilting support shaft 94a as the arc center. The inner peripheral wall 94c is provided behind the arc-shaped hole 94b. The inner peripheral wall 94c is arranged radially inward of the arc-shaped hole 94b with the left-right tilting support shaft 94a as the center. The inner peripheral portion 106b of the nut 106 can abut against the inner peripheral wall 94c. The rotation of the inner peripheral portion 106b in contact with the inner peripheral wall 94c around the axis of the transmission shaft 103 (see FIG. 20) is restricted. When the main body support arm 94 is tilted left and right, the inner peripheral portion 106b slides along the inner peripheral wall 94c with the left-right tilting support shaft 94a as the center.

[0087] As shown in FIGS. 20 and 27, a rear cover 108 is attached to the rear end of the lower part of the main body support arm 94. The rear cover 108 covers the rear part of the tilting fixing mechanism 100 from the outside. Thereby, it is possible to prevent chips and the like from entering the tilting fixing mechanism 100.

[0088] As shown in FIG. 20, when the tilting fixing operation unit 101 (see FIG. 23) is rotated, the transmission shaft 103 is decelerated via the reduction gear unit 102 and rotates about the axis. The rotation of the nut 106 attached to the rear end portion of the transmission shaft 103 about the axis of the transmission shaft 103 is restricted. Therefore, when the transmission shaft 103 is rotated in one direction, the nut 106 is fastened to the transmission shaft 103. As a result, an axial force in the extending direction of the transmission shaft 103 is generated between the thrust needle bearing 104 and the nut 106. The thrust needle bearing 104 and the nut 106 press the arm support portion 91b and the main body support arm 94 from both the front and rear sides by the axial force. Thus, the main body support arm 94 is fixed to the arm support portion 91b and positioned at a predetermined left and right inclination angle. When the transmission shaft 103 is rotated in the reverse direction, the fastening of the nut 106 to the transmission shaft 103 is loosened. As a result, the axial force between the thrust needle bearing 104 and the nut 106 is released. Thus, the main body support arm 94 can be tilted left and right about the axis of the left and right tilting support shaft 94a (see FIG. 26) with respect to the arm support portion 91b.

[0089] According to the desktop cutting machine 90 of the third embodiment described above, the tilting fixing mechanism 100 has a thrust needle bearing 104 and a receiving portion 105 that support the transmission shaft 103 with respect to the turntable 91. The main body support arm 94 is fixed to the arm support portion 91b by sandwiching the arm support portion 91b of the main body support arm 94 and the turntable 91 from both the front and rear sides by the thrust needle bearing 104 and the nut 106. Therefore, the axial force for fixing the main body support arm 94 acts between the thrust needle bearing 104 and the receiving portion 105 and the nut 106. Therefore, no axial force is generated in the transmission shaft 103 in front of the thrust needle bearing 104 and the receiving portion 105. Thereby, the main body support arm 94 can be fixed without applying a load to the turntable 91.

[0090] Also, according to the desktop cutting machine 90, a thrust needle bearing 104 is provided in the support portion that supports the transmission shaft 103 with respect to the turntable 91. Therefore, the thrust needle bearing 104 can receive a large axial force of the transmission shaft 103. As a result, the main body support arm 94 can be fixed to the arm support portion 91b of the turntable 91 with a large axial force.

[0091] Also, according to the desktop cutting machine 90, the main body support arm 94 can tilt in the left - right direction about the left - right tilt support shaft 94a. The nut 106 has a fan - shaped form that conforms to an arc shape centered on the left - right tilt support shaft 94a. Therefore, the nut 106 can smoothly move relative to the main body support arm 94 in an arc shape about the left - right tilt support shaft 94a. Therefore, the main body support arm 94 can tilt smoothly in the left - right direction. Further, when the inner peripheral portion 106b of the nut 106 abuts against the inner peripheral wall 94c of the main body support arm 94, the rotation of the transmission shaft 103 about its axis can be restricted. Therefore, a large axial force can be received by the nut 106. As a result, the main body support arm 94 can be fixed to the arm support portion 91b with a large axial force.

[0092] Also, according to the desktop cutting machine 90, a rear cover 108 is provided behind the main body support arm 94. Therefore, by covering the periphery of the transmission shaft 103 etc. with the rear cover 108, the intrusion of cutting chips etc. can be prevented. As a result, the loss of axial force due to the interposition of cutting chips etc. can be suppressed. Thereby, the main body support arm 94 can be fixed with a large axial force. Also, by preventing the intrusion of cutting chips etc., the main body support arm 94 can tilt smoothly in the left - right direction.

[0093] Also, according to the desktop cutting machine 90, a front cover 93 is provided on the bottom surface of the reduction gear portion 102. Therefore, the intrusion of cutting chips etc. into the reduction gear portion 102 can be prevented. Therefore, the rotation of the tilting and fixing operation portion 101 can be transmitted more reliably to the rear portion of the transmission shaft 103. As a result, the fixing operation of the main body support arm 94 becomes smooth.

[0094] [Other modification examples] Various modifications can be made to the desktop cutting machines 1, 70, and 90 of each of the embodiments described above. Although the case where the rod rotation shaft 62a is provided substantially at the center in the left - right direction of the rotating rod 62 has been illustrated, for utilizing the principle of the lever, for example, the rod rotation shaft 62a may be provided at a position closer to the connecting portion 63a. With such a configuration, without changing the force with which the rod contact portion 61b of the tilting fixing operation portion 61 pushes the rotating rod 62 backward, the pressing force for pressing the main body support arm 50 toward the arm support portion 4b side can be made larger. The transmission shaft 63 may be configured to be provided on the right side of the left end portion of the table extension portion 5 and on the left side of the rotary support shaft 2a. Although the case where the transmission shafts 63 and 83 are provided at substantially the same height has been illustrated, for example, the transmission shafts 63 and 83 side may be arranged below each of the embodiments. With such a configuration, the triangle of the fixed rod 42, the transmission shafts 63 and 83, and the positioning pins 46a and 76a as viewed from the front side can be set smaller, and the table extension portion can be made more compact in the vertical, horizontal, and left - right directions. Also, the reduction ratio of the reduction gear portion 82 can be set larger.

[0095] Although the slide miter saw having both functions of a slide operation and an up - and - down swing operation has been illustrated as the desktop cutting machines 1, 70, and 90, for example, it can also be applied to a desktop miter saw that cannot perform a slide operation and can only perform an up - and - down swing operation.

Explanation of Reference Numerals

[0096] 1... Desktop cutting machine (First Embodiment) 2... Base, 2a... Rotary support shaft, 2b... Horizontal plate portion 3... Auxiliary table portion 4... Turntable, 4a... Table upper surface, 4b... Arm support portion 5... Table extension portion, 5a... Blade plate, 5b... Grooved hole, 5c, 5d... Threaded holes 5e... Spring receiving portion 6... Positioning fence, 6a... Positioning surface, 6b... Fence base portion 7... Mitre scale plate, 7a... Positioning recess, 7b... Fixing screw 10... Cutting machine main body, 10a... Up - and - down swing support shaft 11…Cutting tool, 12…Fixed cover, 13…Movable cover, 14…Main body support part 15…Dust collection guide, 16…Rear dust collection port 17, 17a, 17b…Dust collection hose 18…Dust collector 20…Motor housing, 20a…Air inlet, 21…Electric motor 25…Battery mounting part, 26…Battery 30…Handle part, 31…Main handle, 32…Lock-off button 33…Switch lever, 34…Carrying handle 35…Adapter mounting part, 36…Communication adapter 40…Turntable fixing mechanism 41…Grip part (turntable fixing operation part) 42…Fixing rod (turntable fixing member) 43…Clamping member, 43a…Rotating shaft, 43b…Rod contact part, 43c…Clamping part 45…Positive block mechanism 46…Lock release lever, 46a…Positioning pin, 46b…Engaging pin 46c…Compression spring, 46d…Washer 47…Pin support part, 47a…Insertion hole, 47b…Lead surface part 48…Adjusting bolt 50…Main body support arm (main body tilting part), 50a…Left and right tilting support shafts, 50b…Arc-shaped hole 51…Slide bar 52…Maximum tilt angle switching lever 60…Tilting fixing mechanism 61…Tilting fixing operation part, 61a…Screw shaft part, 61b…Rod contact part, 61c…Insertion hole 62…Rotating rod, 62a…Rod rotating shaft 63…Transmission shaft (tilting fixing transmission shaft), 63a…Connecting part, 63b…Screw shaft part 64…Nut, 64a…Washer 70…Desktop cutting machine (Second embodiment) 71…Table extension part, 71a…Blade plate, 71b…Grooved hole, 71c…Spring receiving part 71d…Lever guide part 72…Body support arm (body tilting part), 72a…Left and right tilting support shafts, 72b…Arc-shaped hole 72c…Anti-rotation hole 75…Positive block mechanism 76…Lock release lever 76a…Positioning pin, 76b…Compression spring, 76c…Flange part 80…Tilting fixing mechanism 81…Tilting fixing operation part, 81a…Insertion hole 82…Reduction gear part, 82a…Drive side gear, 82b…Driven side gear 83…Transmission shaft (tilting fixing transmission shaft), 83a…Threaded shaft part 84…Nut, 84a…Two-sided width part 90…Desktop cutting machine (Third embodiment) 91…Turntable, 91a…Table upper surface, 91b…Arm support part, 91c…Insertion hole 92…Table extension part, 92a…Blade plate, 92b…Spring receiving part, 92c…Insertion hole 93…Front cover 94…Body support arm (body tilting part), 94a…Left and right tilting support shafts, 94b…Arc-shaped hole 94c…Inner peripheral wall 100…Tilting fixing mechanism 101…Tilting fixing operation part, 101a…Insertion hole 102…Reduction gear part, 102a…Drive side gear, 102b…Driven side gear 103…Transmission shaft (tilting fixing transmission shaft) 104…Thrust needle bearing (support part) 104a…Cage, 104b…Washer 104c…Needle 105…Receiving part (support part) 106…Nut, 106a…Outer peripheral part, 106b…Inner peripheral part, 106c…Thread 106d…Washer 107…Sleeve 108…Rear cover

Claims

1. A desktop cutting machine, comprising: a base; a turntable horizontally rotatably supported on the base; a table extension portion extending forward from a substantially circular table body of the turntable; a positive block mechanism capable of positioning the turntable at a predetermined rotation angle with respect to the base, the positive block mechanism comprising: a lock release lever provided at a front portion of the table extension portion; a positioning pin connected to the lock release lever and axially rotating; an engagement pin extending from the positioning pin in a direction orthogonal to the axial direction of the positioning pin; a pin support portion provided below an upper surface of the turntable and having a lead surface portion on which the engagement pin abuts in the axial direction and is inclined with respect to the axial direction to move the positioning pin in the axial direction, the desktop cutting machine having the pin support portion.

2. The desktop cutting machine according to claim 1, wherein the engagement pin is located in front of a rotation center of the turntable and behind a front surface of the table extension portion, the desktop cutting machine.

3. The desktop cutting machine according to claim 1 or 2, wherein the turntable has a turntable fixing mechanism capable of fixing the turntable at an arbitrary rotation angle with respect to the base, and the engagement pin is provided below the turntable fixing mechanism, the desktop cutting machine.

4. The desktop cutting machine according to any one of claims 1 to 3, wherein the lead surface portion of the pin support portion has a fan-shaped groove into which the engagement pin is inserted, the desktop cutting machine.

5. The desktop cutting machine according to claim 4, wherein the lead surface portion of the pin support portion is spiral and extends in a circumferential direction around an axial center of the positioning pin and in the axial direction, the desktop cutting machine.

6. The desktop cutting machine according to any one of claims 1 to 5, wherein a mitre scale plate having a plurality of positioning recesses arranged at predetermined intervals in a circumferential direction and into which the positioning pin can project is provided on an outer periphery of the base, the desktop cutting machine.

7. The desktop cutting machine according to any one of claims 1 to 6, wherein the turntable has a turntable fixing mechanism capable of fixing the turntable at an arbitrary rotation angle with respect to the base, and the lock release lever of the positive block mechanism has a tip portion on a side of a turntable fixing operation portion of the turntable fixing mechanism, the desktop cutting machine.

8. The desktop cutting machine according to claim 7, wherein A desktop cutting machine in which flat portions are provided on both the upper and lower sides of the tip of the unlocking lever of the positive block mechanism.

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