Cutting machine on bench

Abstract

To provide a cutting machine on a bench with good perceptibility to a notch position for a cutter, allowing the cutter to be made closer to a slide bar.SOLUTION: A cutting machine 1 on a bench comprises: a long slide bar 51 extending in a longitudinal direction; a slide base 52 slidable along the slide bar 51; and a cutting machine body 10 swingable in a vertical direction around a vertical swing support shaft 10a as a center. The cutting machine body 10 comprises: an output shaft 37 protruded in a shaft direction perpendicular to the slide bar 51, on which a cutter 11 is attached; an electric motor 23 disposed between the cutter 11 and the slide bar 51 in a state the cutter 11 is vertically placed and positioned at a position higher than that of the slide bar 51; and a driving-force transmission part 30 transmitting driving-force of a motor shaft 23a of the electric motor 23 to the output shaft 37. The driving-force transmission part 30 is placed between the cutter 11 and the slide bar 51 and placed at a position higher than that of the slide bar 51 when the cutting machine body 10 is positioned at a top dead point.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a desktop cutting machine used for cutting workpieces such as wood.

Background Art

[0002] This type of desktop cutting machine has, for example, a long slide bar and a slide base mounted on the slide bar and movable along the slide bar. A cutting machine body is mounted on the slide base. The cutting machine body has an electric motor and a substantially circular cutting tool that rotates using the electric motor as a power source. The side surface of the cutting tool is parallel to the slide bar. The cutting machine body is swingable in the vertical direction with respect to the slide base. The cutting tool is rotated and the cutting machine body is moved toward the workpiece placed below. As a result, the cutting tool cuts into the workpiece. Further, by moving the cutting machine body along the extending direction of the slide bar, the cutting tool moves horizontally with respect to the workpiece. Thereby, the workpiece can be cut along the extending direction of the slide bar.

[0003] The slide bar is disposed to the right of the right side surface of the cutting tool or to the left of the left side surface as viewed from the user located on the front side of the desktop cutting machine so as not to interfere with the 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 to the right of the right side surface of the cutting tool. The motor housing that houses the electric motor is disposed above the cutting tool and protrudes to the left, which is the side opposite to the slide bar, with respect to the cutting tool. Therefore, when the user visually recognizes the cutting position of the cutting tool with respect to the workpiece, the portion protruding to the left of the motor housing may interfere with visibility. Therefore, the user may lower their head to visually recognize the cutting position.

[0004] The invention described in Patent Document 2 has a slide bar extending to the left from the left side of the cutting tool along the side of the cutting tool. The motor housing, which houses the electric motor, is positioned to the right of the cutting tool, and the cutting tool is positioned in an inclined position while remaining vertical. The inclination direction of the motor housing is upward to the right when viewed from the front. When the user is visually checking the cutting position of the cutting tool on the material to be cut, the slide bar located to the left of the cutting tool may obstruct visibility. As a result, the user may have to lower their head to view the cutting position.

[0005] The electric motors used in tabletop cutting machines include DC brushless motors powered by a DC power source such as a rechargeable battery, and AC brushed motors powered by an AC power source. In particular, AC brushed motors have a larger motor diameter than DC brushless motors. Therefore, when the electric motor is placed near the cutting tool, it is positioned between the cutting tool and the slide bar when viewed from the front, or on the opposite side of the slide bar with the cutting tool in between. In the former case, the distance between the cutting tool and the slide bar in the left-right direction becomes wider, and in the latter case, the distance between the electric motor and the slide bar in the left-right direction becomes wider. As a result, the moment of the cutting machine body with the slide bar as the pivot point becomes larger, making it difficult to maintain high mechanical rigidity of the cutting machine body. This may result in a decrease in the cutting accuracy of the cutting tool. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2005-279933 [Patent Document 2] Japanese Patent Publication No. 2018-89867 [Overview of the project] [Problems that the invention aims to solve]

[0007] As mentioned above, there was room for improvement in the placement of the electric motor in the tabletop cutting machine to enhance the visibility of the cutting tool's cutting position, the mechanical rigidity of the cutting machine body, and the cutting accuracy of the cutting tool. Therefore, there is a need for a tabletop cutting machine that offers good visibility of the cutting tool's cutting position and allows the cutting tool to be brought close to the slide bar. [Means for solving the problem]

[0008] According to one feature of this disclosure, a desktop cutting machine has a long slide bar extending in the front-rear direction. The desktop cutting machine has a slide base mounted on the slide bar and sliding along the slide bar in the front-rear direction. The desktop cutting machine has a cutting machine body mounted on the slide base so as to be able to swing vertically around a vertical pivot axis provided on the slide base. The cutting machine body has an output shaft that extends in an axial direction perpendicular to the slide bar and to which a cutting tool is attached. The cutting machine body has an electric motor that is a power source for driving the output shaft and is located between the cutting tool and the slide bar when viewed from the front with the cutting tool in a vertical position, and is positioned above the slide bar. The cutting machine body has a power transmission unit that transmits the driving force of the motor shaft of the electric motor to the output shaft. The power transmission unit is located between the cutting tool and the slide bar when viewed from the front, and is positioned above the slide bar when the cutting machine body is at top dead center.

[0009] Therefore, by providing a power transmission unit between the electric motor and the output shaft, the electric motor can be positioned above the slide bar regardless of whether the cutting machine body is at top dead center or bottom dead center. This allows the cutting tool to be positioned closer to the slide bar. Furthermore, when the cutting machine body is at top dead center, the electric motor and power transmission unit are positioned above the slide bar. As a result, when the cutting machine body is at top dead center, the visibility of the cutting position of the cutting tool is improved. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view of the tabletop cutting machine according to the first embodiment, viewed from the left. [Figure 2]This is a perspective view of the tabletop cutting machine from the right. [Figure 3] This is a perspective view from the right of a tabletop cutting machine with the cutting machine body positioned at the rear end. [Figure 4] This is a right-side view of a tabletop cutting machine with the cutting machine body at its top dead center. [Figure 5] This is a left side view of a tabletop cutting machine with the cutting machine body positioned at the bottom dead center and at the rear end. [Figure 6] This is a right side view of a tabletop cutting machine with the cutting machine body in the bottom dead center position. [Figure 7] This is a right side view of a tabletop cutting machine with the cutting machine body positioned at the bottom dead center and at the rear end. [Figure 8] This is a plan view of a tabletop cutting machine with the cutting machine body in the bottom dead center position. [Figure 9] This is a plan view of a tabletop cutting machine with the cutting machine body positioned at its bottom dead center and rear end. [Figure 10] This is a front view of a tabletop cutting machine with the cutting machine body in the bottom dead center position. [Figure 11] This is a front view of a tabletop cutting machine with the cutting machine body at its bottom dead center and tilted to the left. [Figure 12] This is a front view of a tabletop cutting machine with the cutting machine body at its bottom dead center and tilted to the right. [Figure 13] This is a rear view of a tabletop cutting machine with the cutting machine body at its top dead center. [Figure 14] This is a cross-sectional view taken along the line XIV-XIV in Figure 4. [Figure 15] This is a cross-sectional view taken along the line XV-XV in Figure 4. [Figure 16] This is a left side view showing the cutting machine body of the tabletop cutting machine according to the second embodiment in a state where it is at the top dead center. [Figure 17] This is a right-side view of a tabletop cutting machine with the cutting machine body at its top dead center. [Figure 18] This is a right side view of a tabletop cutting machine with the cutting machine body positioned at top dead center and at the rear end. [Figure 19]It is a right side view of a tabletop cutting machine in a state where the cutting machine body is located at the bottom dead center. [Figure 20] It is a right side view of a tabletop cutting machine in a state where the cutting machine body is located at the bottom dead center and at the rear end. [Figure 21] It is a sectional view taken along line XXI-XXI in FIG. 17, as viewed in the direction of the arrow.

Embodiments for Carrying out the Invention

[0011] According to another feature of the present disclosure, the power transmission unit has a shaft that transmits a driving force from the motor shaft to the output shaft. The shaft intersects the slide bar when viewed axially when the cutting machine body is located at the bottom dead center. Therefore, when the cutting machine body is located at the bottom dead center, the shaft is arranged between the cutting tool and the slide bar when viewed from the front. The electric motor is released above the slide bar above the shaft. Therefore, the distance between the cutting tool and the slide bar in the axial direction of the output shaft can be shortened. As a result, the mechanical rigidity of the cutting machine body can be maintained high, and a decrease in the cutting accuracy of the cutting tool can be suppressed.

[0012] According to another feature of the present disclosure, the diameter of the shaft is 1 / 40 to 1 / 20 of the diameter of the cutting tool. Therefore, the shaft can be provided with sufficient strength to support the electric motor, and the distance between the cutting tool and the slide bar in the axial direction of the output shaft can be shortened.

[0013] According to another feature of the present disclosure, it has a cylindrical shaft housing that houses the shaft. The shaft housing has a diameter-expanded portion that expands in the radial direction of the shaft around the driven-side end of the shaft that is connected to the output shaft. Therefore, the shaft housing can be screwed axially with respect to the housing on the output shaft side. As a result, the assembly property is good, and the support rigidity of the shaft housing can be increased.

[0014] According to other features of this disclosure, the axial distance of the output shaft from the cutting tool to the slide bar is 3 / 4 or less of the diameter of the cutting tool. Therefore, by minimizing the axial distance of the output shaft from the cutting tool to the slide bar, the mechanical rigidity of the cutting machine body supported by the slide bar can be increased. As a result, when the cutting tool is driven into the material to be cut, the wobble of the cutting tool in the axial direction of the output shaft can be suppressed.

[0015] According to other features of this disclosure, when the cutting machine body is at its bottom dead center, the entire electric motor is positioned between the output shaft and the vertical oscillation pivot shaft in the front-rear direction. Therefore, the center of gravity of the cutting machine body at its bottom dead center can be brought closer to the vertical oscillation pivot shaft. As a result, the fluctuating load when the cutting machine body is oscillating up and down can be reduced. The cutting machine body is biased from the bottom dead center to the top dead center by a spring mounted around the vertical oscillation pivot shaft. By reducing the fluctuating load of the cutting machine body, the spring load of the spring can be reduced. In addition, the mechanical rigidity of the cutting machine body around the vertical oscillation pivot shaft can be increased.

[0016] According to other features of this disclosure, when the cutting machine body is at top dead center, the entire electric motor is positioned behind the vertical pivot shaft. Therefore, the load of the electric motor can be used to swing the cutting machine body upward and return it to top dead center. This makes it possible to reduce the spring load of the spring that biases the cutting machine body toward top dead center.

[0017] According to other features of this disclosure, the motor shaft is inclined parallel to or at an angle of 10° or less relative to the side of the cutting tool when viewed from the radial direction of the motor shaft with the cutting tool in a vertical position. Therefore, the motor shaft can be positioned in a position along the side of the cutting tool. As a result, the electric motor can be positioned closer to the cutting tool in the axial direction of the output shaft. This makes the cutting machine body more compact in the axial direction of the output shaft.

[0018] According to another feature of the present disclosure, the center of the electric motor is disposed at a position 30% to 50% of the distance from the tool to the slide bar in the direction perpendicular to the surface of the tool starting from the tool. Therefore, the center of the electric motor is disposed closer to the tool than the slide bar. Thus, the center of gravity of the cutting machine body can be brought closer to the tool in the axial direction of the output shaft. Thereby, when the cutting machine body is moved downward to cut the tool into the workpiece to be cut, the torsional moment caused by the reaction force received by the tool from the workpiece to be cut and the weight of the cutting machine body can be reduced.

[0019] According to another feature of the present disclosure, the electric motor is a brushed motor driven by power supplied from an AC power source. Therefore, even when a brushed motor with a relatively large motor diameter is provided, it is possible to suppress the visibility being obstructed by the brushed motor when checking the cutting position of the tool. Further, even when a brushed motor is provided, the distance between the tool and the slide bar in the axial direction of the output shaft can be shortened.

[0020] According to another feature of the present disclosure, the slide bar has a plurality of bars arranged in parallel. The plurality of bars includes a first bar located at the uppermost position and a second bar located at the lowermost position. When the diameter of the first bar is a [mm], the diameter of the second bar is b [mm], the center-to-center distance between the first bar and the second bar is c [mm], and the diameter of the tool is d [mm], the relationship (a / 2 + b / 2 + c) × 2 < d < (a / 2 + b / 2 + c) × 3.5 is satisfied. Therefore, the plurality of bars can be compactly accommodated within a range of a length shorter than half of the diameter of the tool in the vertical direction. Moreover, the vertical distance including all the plurality of bars is larger than 2 / 7 times the diameter of the tool. Therefore, the plurality of bars can be provided so as to have sufficient strength to support the cutting machine body. Thus, it is possible to achieve both the compactness and the support strength of the slide structure of the cutting machine body.

[0021] According to other features of this disclosure, the motor shaft is oriented with an inclination angle that tilts upward toward the rear when the cutting machine body is at bottom dead center. Therefore, the amount of downward protrusion of the electric motor can be minimized when the cutting machine body is at bottom dead center. This makes the tabletop cutting machine compact in the vertical direction.

[0022] According to other features of this disclosure, the inclination angle of the motor shaft is 30° to 60° with respect to the horizontal when the cutting machine body is at its bottom dead center. Therefore, it is possible to prevent the motor housing that houses the electric motor from coming into contact with the material to be cut. As a result, the material to be cut can be suitably cut using a compactly designed tabletop cutting machine.

[0023] According to other features of this disclosure, the motor shaft is parallel to the horizontal line or has an inclination angle of 10° or less relative to the horizontal line when the cutting machine body is at top dead center. Therefore, the amount of upward or downward protrusion of the electric motor can be suppressed. This prevents obstruction of visibility when checking the cutting position of the blade.

[0024] According to other features of this disclosure, the tabletop cutting machine has an operating handle used to move the cutting machine body relative to a slide bar. The center of the operating handle is located on a virtual plane containing the cutting tool when viewed from the front with the cutting tool in a vertical position, or between the slide bar and the cutting tool. Therefore, the centers of the slide bar and the operating handle can be brought closer together in the axial direction of the output shaft. This reduces the torsional moment of the cutting machine body relative to the slide bar when the user grips the operating handle and causes the cutting tool to cut into the material to be cut. Furthermore, the centers of the cutting tool and the operating handle can be brought closer together in the axial direction of the output shaft. This reduces the torsional moment caused by the reaction force the cutting tool receives from the material to be cut and the operating force used to operate the operating handle when the user grips the operating handle and causes the cutting tool to cut into the material to be cut.

[0025] According to other features of this disclosure, the center of the operating handle is positioned at 30-70% of the axial distance from the cutting tool to the slide bar, with the cutting tool as the starting point. Therefore, the center of the operating handle is positioned so as not to be too far from both the cutting tool and the slide bar. This reduces the torsional moment of the cutting machine body acting between the cutting tool and the operating handle. Moreover, it suppresses the deflection of the slide bar caused by the operating force applied to the operating handle.

[0026] According to other features of this disclosure, the tabletop cutting machine has a bottom dead center stopper that restricts the cutting machine body from moving below the bottom dead center. The center of the bottom dead center stopper is located between the slide bar and the cutting tool when viewed from the front with the cutting tool in a vertical position. Therefore, the distance between the center of the bottom dead center stopper and the slide bar can be shortened in the axial direction of the output shaft. The bottom dead center stopper receives a reaction force when the cutting machine body descends to the bottom dead center. Therefore, by shortening the distance, the torsional moment of the cutting machine body relative to the slide bar due to the reaction force can be reduced.

[0027] According to other features of this disclosure, the center of the bottom dead center stopper is positioned at 30-70% of the axial distance from the cutting tool to the slide bar, with the cutting tool as the starting point. Therefore, the center of the bottom dead center stopper is positioned not too far from both the cutting tool and the slide bar. This reduces the torsional moment of the cutting machine body acting between the reaction force on the bottom dead center stopper and the slide bar, and suppresses the wobble of the cutting tool caused by the torsional moment.

[0028] A first embodiment of this disclosure will be described with reference to Figures 1 to 15. In this embodiment, a tabletop cutting machine 1, also known as a sliding miter saw, is illustrated. As shown in Figures 1 and 2, the tabletop cutting machine 1 has a base 2 that is placed on a table or floor, a turntable 4 for placing the material to be cut, and a cutting machine body 10. The turntable 4 is supported above the base 2 so as to be rotatable horizontally around a rotational support shaft 2a that extends vertically. The cutting machine body 10 is located above the turntable 4. A roughly disc-shaped cutting tool (circular saw blade) 11, also known as a tipped saw blade, is rotatably supported on the cutting machine body 10. The user performs the cutting work from a position in front of the tabletop cutting machine 1. In the following description, the front-to-back direction is defined as the front side from the user's perspective. The up-down, left-right, and right directions are defined relative to the user.

[0029] As shown in Figures 1 and 2, the turntable 4 is approximately circular in plan view, and its table surface 4a is horizontally positioned. The pivot shaft 2a is located in the center of the approximately disc shape of the turntable 4. The base 2 has upward projections 3 at both the left and right ends, and supports the turntable 4 so that it can rotate horizontally in the space between the left and right upward projections 3. In this embodiment, a larger-than-usual turntable 4 is used, and the left and right ends of the base 2 do not have a mounting surface for placing the material to be cut. The turntable 4 has a table extension 5 that extends forward along the side surface of the cutting tool 11. A notched groove 5a is provided in the center of the upper surface of the table extension 5, extending along the side surface of the cutting tool 11. The cutting edge plate provided above the groove 5a is omitted from the drawing for convenience.

[0030] As shown in Figures 1 and 2, a wall-shaped positioning fence 6 is provided above the turntable 4 and the upper projection 3, extending both horizontally and upward. The positioning fence 6 is supported by the left and right upper projections 3. The positioning surface 6b, which is the front surface of the positioning fence 6, is located on a vertical plane passing through the pivot shaft 2a, which is the rotation center of the turntable 4. The material to be cut placed on the turntable 4 is positioned in the front-rear direction by contacting the positioning surface 6b. An upper extension fence 6a can be detachably attached above the positioning fence 6 to extend the positioning surface 6b upward.

[0031] As shown in Figures 1 and 2, an arc-shaped miter scale plate 7 is provided in a roughly half-circumferential area at the front of the base 2. The miter scale plate 7 extends horizontally below the table surface 4a. The miter scale plate 7 works in cooperation with indicators 8 provided on both 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 cutting tool 11 and the positioning surface 6b of the positioning fence 6. By rotating the turntable 4 to the left or right, the cutting tool 11 can be positioned at an oblique angle to the positioning surface 6b of the positioning fence 6. Cutting the material to be cut with the cutting tool 11 in this position is called a miter cut. The miter scale plate 7 is provided with a plurality of radially extending groove-shaped positioning recesses 7b. The positioning recesses 7b are provided at predetermined angular intervals in the circumferential direction of the miter scale plate 7. The tips of the positioning pins 64a, which will be described later, can enter the positioning recesses 7b. The miter scale plate 7 is fixed to the base 2 by multiple fixing screws 7a. The fixing screws 7a are inserted into elongated holes that penetrate the miter scale plate 7 vertically. By loosening the fixing screws 7a and moving the miter scale plate 7 horizontally, the angle between the positioning fence 6 and the cutting tool 11 can be finely adjusted. For example, if the positioning pin 64a 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 manufacturing process.

[0032] As shown in Figures 1 and 2, a substantially cylindrical arm support portion 4b is provided at the rear of the turntable 4, with the front-to-back direction as its axis. Behind the arm support portion 4b, a main body support arm 50 is provided, extending substantially upward. The main body support arm 50 is supported so as to be able to tilt left and right relative to the arm support portion 4b, around a left-to-right tilting pivot shaft 50a that extends in the front-to-back direction. The main body support arm 50 is tilted generally to the right upward when the cutting tool 11 is vertical. The upper part 50b of the main body support arm 50 is shaped to be retracted from the movable range of the cutting machine body 10 when the slide base 52, which will be described later, is moved to its rear end.

[0033] As shown in Figures 1 and 2, a long slide bar 51 is mounted on the upper part 50b of the main support arm, extending horizontally and parallel to the side of the cutting tool 11. The slide bar 51 has an upper first bar 51a and a lower second bar 51b arranged side by side in the vertical direction. A slide base 52 is attached to the first bar 51a and the second bar 51b so as to be slidable in the front-rear direction. The cutting machine body 10 is connected to the left of the slide base 52. Therefore, the cutting machine body 10 is positioned to the left of the first bar 51a and the second bar 51b when the cutting tool 11 is in a vertical position. By sliding the slide base 52 in the front-rear direction, a wide material to be cut, for example, placed on the turntable 4 can be cut. A knob 9 is provided on the upper right side of the slide base 52. By rotating the knob 9 in the tightening direction, the slide base 52, which slides relative to the slide bar 51, can be fixed at any position.

[0034] As shown in Figures 4 and 10, the first bar 51a is formed in a cylindrical shape with a diameter 51e of, for example, 30 mm. The second bar 51b is formed in a cylindrical shape with a diameter 51f of, for example, 25 mm, which is smaller than the diameter 51e. The center 51c of the first bar 51a and the center 51d of the second bar 51b extend parallel to each other in the front-to-back direction. The positions of the center 51c of the first bar 51a and the center 51d of the second bar 51b are approximately the same in the left-to-right direction when the cutting tool 11 is vertical. The first virtual plane S1 is defined as a virtual plane that passes through the center in the thickness direction of the base metal of the cutting tool 11 and extends parallel to the side surface of the cutting tool 11. The second virtual plane S2 is defined as a virtual plane that passes through the center 51c of the first bar 51a and the center 51d of the second bar 51b. The first virtual plane S1 and the second virtual plane S2 are approximately parallel.

[0035] As shown in Figures 4 and 10, the cutting tool 11 rotates around the output shaft 37. The distance between the first virtual plane S1 and the second virtual plane S2 in the left-right direction (the direction in which the output shaft 37 extends) is 3 / 4 or less of the diameter 11a of the cutting tool 11, and preferably 1 / 2 or less of the diameter 11a of the cutting tool 11. The distance between the first virtual plane S1 and the second virtual plane S2 is, for example, 132 mm, assuming a diameter 11a of 305 mm. The center 51c of the first bar 51a and the center 51d of the second bar 51b are separated by a center-to-center distance 51g of, for example, 65 mm in the vertical direction. The diameters 51e, 51f and the center-to-center distance 51g are set to satisfy the following relationship (Equation 1), where a [mm] is the diameter 51e, b [mm] is the diameter 51f, c [mm] is the center-to-center distance 51g, and d [mm] is the diameter 11a of the cutting tool 11. For example, in the case of a tabletop cutting machine 1 equipped with a cutting tool 11 having a diameter 11a of 305 mm, the diameters 51e, 51f and the distance between centers 51g are set such that 305 / 3.5 = 87 [mm] < (a / 2 + b / 2 + c) < 305 / 2 = 153 [mm]. (Formula 1)(a / 2+b / 2+c)×2 <d<(a / 2+b / 2+c)×3.5

[0036] As shown in Figures 11 and 12, the main support arm 50 can be tilted up to 45° to the left and right around the left and right tilting pivot shaft 50a. Furthermore, by switching the tilting positioning mechanism (located at the rear of the main support arm 50, but omitted in the drawings for convenience), it can be tilted up to a maximum of 48°. Therefore, the cutting tool 11 can also be tilted up to a maximum of 48° to the left and right around the left and right tilting pivot shaft 50a. By tilting the cutting tool 11 in the left and right directions, a so-called bevel cut can be performed on the material to be cut placed on the turntable 4. When the cutting machine body 10 is tilted to the left, there are no protruding parts to the left of the cutting tool 11 and around the lower part of the cutting tool 11 (in the figure, the movable cover 13 is located around the lower part of the cutting tool 11, but in reality it moves upward). Therefore, the cutting machine body 10 other than the cutting tool 11 does not come into contact with the material to be cut, and a suitable bevel cut can be performed. When the cutting machine body 10 is tilted to the right, it does not have any protruding parts to the right of the cutting tool 11 and around the lower part of the cutting tool 11. Therefore, the cutting machine body 10 other than the cutting tool 11 does not come into contact with the material to be cut, allowing for optimal bevel cutting.

[0037] As shown in Figures 4 and 5, the cutting machine body 10 is capable of vertical oscillation relative to the slide base 52 around a vertical oscillation support shaft 10a that extends in the left-right direction. The vertical oscillation support shaft 10a is located behind the cutting tool 11. By swinging the cutting machine body 10 downward, the cutting tool 11 can be made to cut into the material to be cut placed on the turntable 4. The vertical oscillation angle of the cutting machine body 10 is 40° at top dead center, with bottom dead center being 0°. In other words, the cutting machine body 10 can oscillate vertically within a range of 40°. A torsion spring is provided around the vertical oscillation support shaft 10a to bias the cutting machine body upward toward top dead center.

[0038] As shown in Figures 4 and 5, the cutting machine body 10 has a fixed cover 12 and a movable cover 13 that cover the blade 11. The fixed cover 12 covers the upper half circumference of the blade 11 from both the left and right sides and radially outward. The movable cover 13 can cover the lower half circumference of the blade 11. The movable cover 13 rotates in conjunction with the vertical oscillation of the cutting machine body 10, opening and closing the lower half circumference of the blade 11. When the cutting machine body 10 is swung upward, the movable cover 13 rotates in the closed position direction (clockwise in Figure 5). Therefore, when the cutting machine body 10 is at top dead center, the lower half circumference of the blade 11 is covered. When the cutting machine body 10 is swung downward, the movable cover 13 rotates in the open position direction (counterclockwise in Figure 5). Therefore, the lower half circumference of the blade 11 is exposed, and the blade 11 can cut into the material to be cut placed on the turntable 4.

[0039] As shown in Figures 14 and 15, the cutting tool 11 is integrally attached to an output shaft 37 that extends in the left-right direction and is rotatably supported on the cutting machine body 10. The cutting tool 11 is attached to the output shaft 37 by tightening a fixing screw 14, with its rotational center sandwiched between the outer flange 15 and the inner flange 16.

[0040] As shown in Figure 13, a bottom dead center stopper 17 is provided on the right side of the cutting machine body 10. The bottom dead center stopper 17 has a bolt that is screw-connected to the cutting machine body 10 and protrudes downward. The protruding length of the bottom dead center stopper 17 can be changed, for example, by inserting a hexagonal wrench into the hexagonal hole in the head of the bolt and rotating it. This allows for fine adjustment of the bottom dead center position of the cutting machine body 10. A bottom dead center stopper contact portion 52a (see Figure 4) is provided on the front surface of the slide base 52, which contacts the tip of the bottom dead center stopper 17 when the cutting machine body 10 is lowered to the bottom dead center. The bottom dead center stopper contact portion 52a is a flat surface provided on the upper surface of a projection that protrudes forward from the front surface of the slide base 52.

[0041] As shown in Figure 13, the bottom dead center stopper 17 is located between the side of the cutting tool 11 and the slide bar 51 in the left-right direction. The center 17a of the bottom dead center stopper 17 is located to the right of the first virtual plane S1 passing through the center of the cutting tool 11, and to the left of the second virtual plane S2 passing through the center 51c of the first bar 51a, when the cutting tool 11 is in a vertical position and the cutting machine body 10 is at the top dead center. Preferably, the center 17a is positioned at 30-70% of the distance from the first virtual plane S1 to the second virtual plane S2, in the direction perpendicular to the surface of the cutting tool 11, starting from the first virtual plane S1, for example, at 58% of that distance. The distance from the first virtual plane S1 to the center 17a is, for example, 76.5 mm. If the distance from the first virtual plane S1 to the second virtual plane S2 is 132 mm, then 76.5 mm / 132 mm = 58%.

[0042] As shown in Figures 5, 8, and 13, a top dead center stopper 18 protruding to the left is provided on the left side of the fixed cover 12. A planar top dead center stopper contact portion 52b, which can contact the top dead center stopper 18, is provided on the upper surface of the left side of the slide base 52. The upward movement of the cutting machine body 10 is stopped at the top dead center when the top dead center stopper 18 and the top dead center stopper contact portion 52b come into contact.

[0043] As shown in Figure 1, a bottom dead center lock pin 19 extending to the left is provided on the left side of the front of the slide base 52. The fixing cover 12 is provided with a through hole 19a extending left and right in front of the top dead center stopper 18. The bottom dead center lock pin 19 can move to the right and enter the through hole 19a when the cutting machine body 10 moves to the bottom dead center. By pushing the left end of the bottom dead center lock pin 19 to the right and entering the through hole 19a, the cutting machine body 10 can be locked at the bottom dead center.

[0044] As shown in Figures 8-10, the cutting machine body 10 has a motor housing 20 between the cutting tool 11 and the slide bar 51 in the left-right direction. An electric motor 23 is housed in the motor housing 20. A motor shaft 23a is provided in the center of the electric motor 23. The motor shaft 23a extends in the front-rear direction along the motor axis J, which is parallel to the side surface of the cutting tool 11. The motor housing 20 is formed by connecting a rear housing 21 and a front housing 22 in the front-rear direction. The rear housing 21 is a substantially cylindrical shape that extends in the front-rear direction. The front housing 22 is a substantially conical shape whose diameter decreases from rear to front. A power cord 25 that can be connected to an external AC power source is provided above the motor housing 20. The power cord 25 extends rearward along the longitudinal direction of the motor housing 20 (for convenience, only the cord guard is shown in the drawing, and the rest of the power cord 25 is omitted).

[0045] As shown in Figure 14, the front end 21a of the rear housing 21 has a larger inner diameter than the rear region of the rear housing 21. The rear end 22a of the front housing 22 has a larger inner diameter than the front region of the front housing 22. The front end 21a of the rear housing 21 and the rear end 22a of the front housing 22 are connected by a plurality of fixing screws 21b (see Figure 9) that extend along the motor axis J direction.

[0046] As shown in Figures 4 and 14, the electric motor 23 is an AC brushed motor that is powered and driven by an AC power source. The motor shaft 23a is supported so as to be rotatable about the motor axis J by a first bearing 23e and a second bearing 23f. The inner ring of the first bearing 23e is press-fitted onto the rear end of the motor shaft 23a, and the outer ring is press-fitted into a hole provided at the inner rear end of the rear housing 21. Inside the front housing 22, a cylindrical shaft support portion 22b extending in the front-rear direction is provided. The inner ring of the second bearing 23f is press-fitted onto the front of the motor shaft 23a, and the outer ring is press-fitted into a hole 22c provided at the rear end of the shaft support portion 22b.

[0047] As shown in Figure 14, the stator 23b of the electric motor 23 is supported non-rotatably on the inner circumferential surface of the rear housing 21. The rotor 23c of the electric motor 23 is positioned on the inner circumferential side of the stator 23b. The rotor 23c is mounted along the outer circumference of the motor shaft 23a and is rotatable together with the motor shaft 23a. A commutator 23d is mounted behind the rotor 23c. An air intake port is provided on the rear surface of the rear housing 21 to allow outside air to be taken in. A fan 24 is mounted between the second bearing 23f and the rotor 23c at the front of the motor shaft 23a so as to be rotatable together with the motor shaft 23a. The fan 24 is housed on the inner circumferential side of the rear end 22a of the front housing 22. When the electric motor 23 is driven and the fan 24 rotates, cooling air is introduced into the motor housing 20 from the air intake port. The cooling air flows towards the front fan 24 and is discharged from an exhaust port provided in the front housing 22 radially outward from the fan 24. The electric motor 23 is cooled by the cooling air.

[0048] As shown in Figures 8 and 10, the cutting machine body 10 has a power transmission unit 30 that transmits the driving force of the motor shaft 23a to the output shaft 37 between the cutting tool 11 and the slide bar 51 in the left-right direction. The power transmission unit 30 is housed in a shaft housing 31, a gear housing 33, and a gear housing 12a provided on the right side of the fixed cover 12. The shaft housing 31 is connected to the opening at the front end of the front housing 22. The gear housing 33 connects the opening at the front end of the shaft housing 31 to the opening at the right end of the gear housing 12a.

[0049] As shown in Figure 14, the shaft housing 31 is substantially cylindrical and extends along the side surface of the cutting tool 11. The motor housing connecting portion 31a at the rear end of the shaft housing 31 and the gear housing connecting portion 31b at the front end are larger in diameter than the central region of the shaft housing 31. The gear housing connecting portion 31b has a larger inner diameter than the motor housing connecting portion 31a. The motor housing connecting portion 31a is connected to the front end of the front housing 22 by a spigot joint that covers the outer circumference of the shaft support portion 22b. The motor housing connecting portion 31a and the front end of the front housing 22 are connected by a plurality of fixing screws 22e that extend along the motor axis J direction. The gear housing connecting portion 31b is connected to the shaft housing connecting portion 33a at the rear end of the gear housing 33 by a plurality of fixing screws 33e (see Figure 4) that extend along the motor axis J direction.

[0050] As shown in Figure 14, the shaft housing 31 houses a long, linearly extending shaft 32. The shaft 32 is positioned coaxially with the motor shaft 23a. The shaft 32 is formed in a cylindrical shape with a diameter 32c that is 1 / 40 to 1 / 20 of the diameter 11a of the cutting tool 11. For example, the diameter 32c is 10mm, assuming the diameter 11a of the cutting tool 11 is 305mm. The front end of the motor shaft 23a and the rear drive end 32a of the shaft 32 are inserted into a cylindrical connecting sleeve 32d to connect them in a way that allows for the transmission of rotational power. The shaft 32 is a long-shaft drive shaft, and the length per diameter (length / diameter) is 10 to 20. For example, for a diameter 32c of 10mm, the length 32j is 127mm, in which case 127mm / 10mm [=length 32j / diameter 32c] is 12.7. The materials used are alloy steels for machine structures, such as chromium-molybdenum steel (SCM) and nickel-chromium-molybdenum steel (SNCM). For example, chromium-molybdenum steel is used.

[0051] As shown in Figure 14, the shaft 32 is rotatably supported around the motor axis J by a third bearing 32g and a fourth bearing 32h. The inner ring of the third bearing 32g is press-fitted into the rear of the shaft 32, and the outer ring is press-fitted into a hole 22d provided at the front end of the shaft support portion 22b. The inner ring of the fourth bearing 32h is press-fitted into the front of the shaft 32, and the outer ring is press-fitted into a hole 33c provided at the rear end of the gear housing 33 in the shaft housing connecting portion 33a. The fourth bearing 32h is prevented from coming out of the hole 33c by a washer 32i. By positioning both the second bearing 23f and the third bearing 32g in the holes 22c and 22d provided in the front housing 22, the positions of the motor shaft 23a, the shaft 32 and the first intermediate shaft 35 can be made highly accurate. A drive-side bevel gear 32e is integrally attached to the front driven end 32b of the shaft 32. A nut 32f is attached to the front of the drive-side bevel gear 32e to prevent it from coming loose. The drive-side bevel gear 32e is located inside the gear housing 33.

[0052] As shown in Figures 14 and 15, the gear housing 33 is provided with a shaft housing connecting portion 33a that opens towards the rear at its rear end and a fixed cover connecting portion 33b that opens towards the left at its left side, both of which are in internal communication. The gear housing portion 12a of the fixed cover 12 is provided with a gear housing connecting portion 12d that opens towards the right at its right end and an opening that connects to the left cutting tool 11, both of which are in internal communication. The fixed cover connecting portion 33b is connected to the gear housing connecting portion 12d by a spigot joint that covers the outer circumference. The fixed cover connecting portion 33b and the gear housing connecting portion 12d are connected by a plurality of fixing screws 33f that extend in a direction substantially perpendicular to the side surface of the cutting tool 11.

[0053] As shown in Figures 14 and 15, the gear housing 33 and the gear bay 12a support the first intermediate shaft 35, the second intermediate shaft 36, and the output shaft 37, respectively, so as to be rotatable around their axes. The first intermediate shaft 35, the second intermediate shaft 36, and the output shaft 37 extend in the left-right direction perpendicular to the side surface of the cutting tool 11. A bearing box 34 is connected to the left side surface of the gear housing 33 by a plurality of fixing screws 34d that extend in a direction substantially perpendicular to the side surface of the cutting tool 11. The bearing box 34 holds the bearings that support the first intermediate shaft 35, the second intermediate shaft 36, and the output shaft 37, respectively.

[0054] As shown in Figure 14, the first intermediate shaft 35 is rotatably supported by the fifth bearing 35c and the sixth bearing 35d. The inner ring of the fifth bearing 35c is press-fitted onto the right end of the first intermediate shaft 35, and the outer ring is press-fitted into a hole 33d provided on the right side inside the gear housing 33. The inner ring of the sixth bearing 35d is press-fitted onto the left end of the first intermediate shaft 35, and the outer ring is press-fitted into a hole 34a provided in the bearing box 34. By positioning both the fourth bearing 32h and the fifth bearing 35c in the holes 33c and 33d provided in the gear housing 33, the position of the shaft 32 and the first intermediate shaft 35 can be made highly accurate. Furthermore, the meshing of the drive-side bevel gear 32e and the driven-side bevel gear 35a can be made highly accurate.

[0055] As shown in Figure 14, a driven bevel gear 35a is inserted into the right side of the first intermediate shaft 35 in an intermediate fit so as to be movable in the axial direction. The driven bevel gear 35a and the first intermediate shaft 35 are relatively prevented from rotating by the engagement of a key and a keyway. A steel washer 35e, a rubber ring 35f, and a steel washer 35g are attached to the first intermediate shaft 35 on the right side of the driven bevel gear 35a. A wheel chock 35h is attached to the rubber ring 35f, which is sandwiched between washers 35e and 35g, so as to be compressed in the axial direction. The rubber ring 35f cushions shocks and vibrations between the first intermediate shaft 35 and the driven bevel gear 35a. The driven bevel gear 35a meshes with the drive bevel gear 32e. The rotational power of shaft 32 is reduced and transmitted to the first intermediate shaft 35 via the meshing of the drive-side bevel gear 32e and the driven-side bevel gear 35a, and its rotational direction is converted to approximately vertical. A reduction gear 35b is formed as an integral part with the first intermediate shaft 35 between the driven-side bevel gear 35a and the sixth bearing 35d in the left-right direction.

[0056] As shown in Figure 15, the second intermediate shaft 36 is rotatably supported by a seventh bearing 36b and an eighth bearing 36c. The seventh bearing 36b has an inner ring press-fitted into the right end of the second intermediate shaft 36, and an outer ring press-fitted into a hole 12b provided on the inside right side of the gear housing 12a. The eighth bearing 36c has an inner ring press-fitted into the left end of the second intermediate shaft 36, and an outer ring press-fitted into a hole 34b provided in the bearing box 34. Between the seventh bearing 36b and the eighth bearing 36c in the left-right direction, a reduction gear 36a is formed as an integral part with the second intermediate shaft 36. The reduction gear 36a meshes with a reduction gear 35b. The rotational power of the first intermediate shaft 35 is reduced and transmitted to the second intermediate shaft 36 via the meshing of the reduction gear 35b and the reduction gear 36a.

[0057] As shown in Figure 15, the output shaft 37 is rotatably supported by a ninth bearing 37b and a tenth bearing 37c. The inner ring of the ninth bearing 37b is press-fitted into the right end of the output shaft 37, and the outer ring is press-fitted into a hole 12c provided on the inside right side of the gear housing 12a. The inner ring of the tenth bearing 37c is press-fitted into the center of the output shaft 37, and the outer ring is press-fitted into a hole 34c provided in the bearing box 34. Between the ninth bearing 37b and the tenth bearing 37c in the left-right direction, a reduction gear 37a is formed as an integral part with the output shaft 37. The reduction gear 37a meshes with a reduction gear 36a. The rotational power of the second intermediate shaft 36 is reduced and transmitted to the output shaft 37 via the meshing of the reduction gears 36a and 37a. Thus, the rotational power of the motor shaft 23a (see Figure 14) is reduced and transmitted to the output shaft 37, causing the cutting tool 11 to rotate.

[0058] As shown in Figures 4-7, the electric motor 23 is positioned above the first bar 51a regardless of whether the cutting machine body 10 is at top dead center or bottom dead center when the blade 11 is in a vertical position. The shaft 32 is positioned above the first bar 51a when the cutting machine body 10 is at top dead center when the blade 11 is in a vertical position. The shaft 32 overlaps the slide bar 51 in the vertical direction when the cutting machine body 10 is at bottom dead center when the cutting machine body 10 is at bottom dead center when the blade 11 is in a vertical position. The motor shaft 23a is tilted to the horizontal line preferably in the range of -10° to 0° to 10° when the blade 11 is in a vertical position and the cutting machine body 10 is at top dead center (a downward tilt of the motor shaft 23a relative to the horizontal line (0°) is considered negative, and an upward tilt is considered positive). In this embodiment, the motor shaft 23a is parallel to the horizontal line when the cutting machine body 10 is at top dead center. The entire motor shaft 23a is positioned behind the vertical pivot shaft 10a when the cutting machine body 10 is at its top dead center.

[0059] As shown in Figure 6, when the cutting machine body 10 is at its bottom dead center, the motor shaft 23a tilts upward toward the rear on the side opposite the gear. The angle of inclination is 40° with respect to the horizontal. When the cutting tool 11 is vertical and the cutting machine body 10 is at its bottom dead center, the motor shaft 23a tilts in the range of 30 to 60° with respect to the horizontal, more preferably in the range of 35 to 45°. Therefore, the electric motor 23 is designed to be compact in the vertical direction even when the cutting machine body 10 is at its bottom dead center. The entire motor shaft 23a is located in front of the vertical pivot shaft 10a when the cutting machine body 10 is at its bottom dead center.

[0060] As shown in Figures 8, 10, and 14, the motor shaft 23a extends parallel to the side surface of the cutting tool 11. The angle that the motor shaft 23a makes with respect to the side surface of the cutting tool 11 is preferably -10° to 0° to 10° when viewed from the extension direction of the cutting tool 11 and the radial direction of the motor shaft 23a (a negative angle is defined as the motor shaft 23a being tilted to the left relative to being parallel to the cutting tool (0°), and a positive angle is defined as tilting to the right). Within this angle range, it is only necessary to change the axial angles of the drive-side bevel gear 32e and the driven-side bevel gear 35a that mesh with each other, and no major changes to the design concept, such as adding parts, are required.

[0061] As shown in Figure 10, the motor shaft 23a, which is the center of the electric motor 23, is located to the right of the cutting tool 11 and to the left of the slide bar 51 when the cutting tool 11 is in a vertical position and the cutting machine body 10 is at its top dead center. Preferably, the motor shaft 23a is positioned at 30-50% of the distance from the first virtual plane S1 to the second virtual plane S2, starting from the first virtual plane S1 and moving to the right in the direction perpendicular to the surface of the cutting tool 11, for example, at 43% of that distance. The distance from the first virtual plane S1 to the motor shaft 23a is, for example, 56.2 mm. If the distance from the first virtual plane S1 to the second virtual plane S2 is 132 mm, then 56.2 mm / 132 mm = 43%.

[0062] As shown in Figures 8 and 10, the cutting machine body 10 has a handle portion 40 located to the right of the side of the blade 11 and in front of the gear housing 33, with the blade 11 in a vertical position. A loop-shaped operating handle 41 is provided at the front of the handle portion 40, extending in a left-right direction approximately perpendicular to the side of the blade 11. A switch lever 42 is provided on the inner circumference of the operating handle 41. The switch lever 42 can be pulled by the user by gripping the operating handle 41 with their fingers. When the switch lever 42 is pulled, the electric motor 23 starts and the blade 11 rotates. A lock-off button 43 is provided on the front of the operating handle 41. Pressing the lock-off button 43 allows the operation of pulling the switch lever 42. This prevents the electric motor 23 from starting unexpectedly.

[0063] As shown in Figure 10, the left-right center 41a of the operating handle 41 is located between the left-right direction of the first virtual plane S1 and the second virtual plane S2 when the cutting tool 11 is in a vertical position and the cutting machine body 10 is at the top dead center. Preferably, the center 41a is positioned at 30-70% of the distance from the first virtual plane S1 to the second virtual plane S2, starting from the first virtual plane S1 and moving to the right in the direction perpendicular to the surface of the first virtual plane S1, for example, at 70% of that distance. The distance from the first virtual plane S1 to the center 41a is, for example, 92 mm. If the distance from the first virtual plane S1 to the second virtual plane S2 is 132 mm, then 92 mm / 132 mm = 70%.

[0064] As shown in Figures 4, 5, and 8, the handle section 40 has a carrying handle 44 behind the operating handle 41. The carrying handle 44 is loop-shaped, with a first connecting section 44a at one end and a second connecting section 44b at the other end. The first connecting section 44a is connected to the rear of the operating handle 41, which extends to the right of the fixed cover 12. The second connecting section 44b is connected to the upper part of the front housing 22. The carrying handle 44 is positioned in the front-rear direction along the motor shaft 23a with the cutting tool in a vertical position. The carrying handle 44 extends in a generally horizontal direction when the cutting machine body 10 is moved to the bottom dead center. With the cutting machine body 10 locked at the bottom dead center by the bottom dead center lock pin 19, the user can carry the tabletop cutting machine 1 by gripping the carrying handle 44.

[0065] As shown in Figures 1 and 4, a turntable fixing mechanism 60 is provided at the lower part of the table extension 5. A grip portion 61 is provided at the front of the table extension 5. The grip portion 61 has an uneven shape on its periphery to make it easy for the user to grip and rotate it. The user can grip the grip portion 61 and rotate the turntable 4 horizontally relative to the base 2. A fixing rod 62 extends in the front-rear direction from the grip portion 61 toward the rear inside the table extension 5. The fixing rod 62 is supported inside the table extension 5 by screw engagement. The grip portion 61 is rotatable about the fixing rod 62 as its axis. When the grip portion 61 is rotated about the axis of the fixing rod 62, the fixing rod 62 is displaced in the front-rear direction. By displacing the fixing rod 62 backward and engaging its rear end with the base 2, the turntable 4 can be positioned at any miter angle relative to the base 2. By displacing the fixing rod 62 forward, the positioning of the turntable 4 at any miter angle can be released.

[0066] As shown in Figures 4 and 5, a positive lock mechanism 63 is provided at the lower part of the table extension 5. By using the positive lock mechanism 63, 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 63 is provided with a release lever 64 and a positioning pin 64a. The release lever 64 is provided behind and below the grip portion 61 at the front of the table extension 5. The positioning pin 64a extends in the front-rear direction along the longitudinal direction of the table extension 5 at the lower part of the table extension 5. The positioning pin 64a is provided at approximately the same height as the miter scale plate 7. The rear end of the positioning pin 64a can enter the positioning recess 7b by being displaced rearward. Also, the rear end of the positioning pin 64a can be released from engagement with the positioning recess 7b by being displaced forward.

[0067] The front of the positioning pin 64a shown in Figures 4 and 5 is connected to the unlock lever 64. When the unlock lever 64 is pushed downward, the positioning pin 64a is displaced forward. The rear end of the positioning pin 64a, displaced forward, is released from engagement with the positioning recess 7b. Therefore, when the positioning of the turntable 4 is released by operating the grip portion 61, the turntable 4 can be freely rotated left and right. When the unlock lever 64 is raised upward, the positioning pin 64a is displaced backward. The rear end of the positioning pin 64a comes into contact with the outer edge of the miter scale plate 7. When the turntable 4 is rotated horizontally by gripping the grip portion 61, the positioning pin 64a enters one of the positioning recesses 7b provided on the outer edge of the miter scale plate 7. Thus, the turntable 4 is positioned at a predetermined miter angle corresponding to the positioning recess 7b.

[0068] As shown in Figures 4 and 5, a tilt-locking mechanism 65 is provided at the front of the table extension 5 to hold the main support arm 50 in a position that allows it to tilt in the left-right direction. The tilt-locking mechanism 65 has a tilt-locking operating part 66 and a transmission shaft 66a (see Figure 13). The tilt-locking operating part 66 is provided between the grip part 61 and the front end of the table extension 5. The tilt-locking operating part 66 can be rotated around an axis coaxial with the grip part 61. The tilt-locking operating part 66 has a different pattern of unevenness on its periphery than the unevenness of the grip part 61, making it easy for the user to grasp and rotate it. Therefore, when the user grasps it, they can easily distinguish between the tilt-locking operating part 66 and the grip part 61, preventing accidental operation.

[0069] When the tilt-locking operation unit 66 shown in Figures 4 and 5 is rotated, the transmission shaft 66a (see Figure 13) rotates around its axis. The transmission shaft 66a extends in the front-rear direction along the longitudinal direction of the table extension 5 to the lower part of the main support arm 50. At the lower part of the main support arm 50, a receiving part 67 is provided that is movable along an elongated hole 67a (see Figure 13) that extends in an arc shape around the left and right tilting support shafts 50a. The receiving part 67 is screw-fastened to the rear end of the transmission shaft 66a. The rotation of the transmission shaft 66a around its axis is restricted by the side surface of the elongated hole 67a of the receiving part 67. Therefore, when the tilt-locking operation unit 66 is rotated in the tightening direction, an axial force is generated on the transmission shaft 66a between the main support arm 50 and the arm support part 4b. As a result, the main support arm 50 and the arm support part 4b are pressed in the front-rear direction, and the main support arm 50 is fixed to the arm support part 4b at an arbitrary left-right tilt angle. When the tilt locking operation part 66 is rotated in the loosening direction, the axial force on the transmission shaft 66a is released. As a result, the main body support arm 50 becomes able to tilt left and right around the left and right tilting support shaft 50a.

[0070] As described above, the desktop cutting machine 1 has a long slide bar 51 that extends in the front-rear direction, as shown in Figures 4 and 10. The desktop cutting machine 1 has a slide base 52 that is mounted on the slide bar 51 and slides along the slide bar 51 in the front-rear direction. The desktop cutting machine 1 has a cutting machine body 10 that is mounted on the slide base 52 so as to be able to swing in the vertical direction around a vertical pivot shaft 10a provided on the slide base 52. The cutting machine body 10 has an output shaft 37 that extends in an axial direction perpendicular to the slide bar 51 and to which the cutting tool 11 is attached. The cutting machine body 10 has an electric motor 23 that is a power source for driving the output shaft 37 and is located between the cutting tool 11 and the slide bar 51 when viewed from the front with the cutting tool 11 in a vertical position, and is located above the slide bar 51. The cutting machine body 10 has a power transmission unit 30 that transmits the driving force of the motor shaft 23a of the electric motor 23 to the output shaft 37. The power transmission unit 30 is located between the cutting tool 11 and the slide bar 51 when viewed from the front, and is positioned above the slide bar 51 when the cutting machine body 10 is at top dead center.

[0071] Therefore, by providing a power transmission unit 30 between the electric motor 23 and the output shaft 37, the electric motor 23 can be positioned above the slide bar 51 regardless of the position of the cutting machine body 10, from top dead center to bottom dead center. As a result, the cutting tool 11 can be positioned closer to the slide bar 51. Moreover, when the cutting machine body 10 is at top dead center, the electric motor 23 and the power transmission unit 30 are positioned above the slide bar 51. Therefore, when the cutting machine body 10 is at top dead center, the visibility of the cutting position of the cutting tool 11 is improved.

[0072] As shown in Figures 7 and 14, the power transmission unit 30 has a shaft 32 that transmits driving force from the motor shaft 23a to the output shaft 37. The shaft 32 intersects the slide bar 51 when viewed from the axial direction when the cutting machine body 10 is at the bottom dead center. Therefore, when the cutting machine body 10 is at the bottom dead center, the shaft 32 is positioned between the cutting tool 11 and the slide bar 51 when viewed from the front. The electric motor 23 is positioned above the shaft 32 and above the slide bar 51. This allows the distance between the cutting tool 11 and the slide bar 51 in the axial direction of the output shaft 37 to be shortened. This allows the mechanical rigidity of the cutting machine body 10 to be maintained at a high level and suppresses a decrease in the cutting accuracy of the cutting tool 11.

[0073] As shown in Figure 14, the diameter 32c of the shaft 32 is 1 / 40 to 1 / 20 of the diameter 11a of the cutting tool 11. Therefore, the shaft 32 can be provided with the strength necessary to support the electric motor 23, and the distance between the cutting tool 11 and the slide bar 51 in the axial direction of the output shaft 37 can be shortened.

[0074] As shown in Figures 4 and 14, the shaft housing 31 has a cylindrical shaft housing 31 that accommodates the shaft 32. The shaft housing 31 has a gear housing connecting portion 31b that expands radially around the driven end of the shaft 32, which is connected to the output shaft 37. Therefore, the shaft housing 31 can be screwed axially to the gear housing 33 on the output shaft 37 side. This results in good assembly and allows for high support rigidity of the shaft housing 31.

[0075] As shown in Figure 10, the axial distance of the output shaft 37 from the cutting tool 11 to the slide bar 51 is 3 / 4 or less of the diameter 11a of the cutting tool 11. Therefore, by minimizing the axial distance of the output shaft 37 from the cutting tool 11 to the slide bar 51, the mechanical rigidity of the cutting machine body 10 supported by the slide bar 51 can be increased. As a result, when the cutting tool 11 cuts into the material to be cut, the wobble of the cutting tool 11 in the axial direction of the output shaft 37 can be suppressed.

[0076] As shown in Figures 5-7, when the cutting machine body 10 is at its bottom dead center, the entire electric motor 23 is positioned between the output shaft 37 and the vertical oscillation support shaft 10a in the front-rear direction. Therefore, the center of gravity of the cutting machine body 10 at its bottom dead center can be brought closer to the vertical oscillation support shaft 10a. As a result, the fluctuating load when the cutting machine body 10 is oscillating up and down can be reduced. The cutting machine body 10 is biased from the bottom dead center to the top dead center by a torsion spring mounted around the vertical oscillation support shaft 10a. By reducing the fluctuating load of the cutting machine body 10, the spring load of the torsion spring can be reduced. In addition, the mechanical rigidity of the cutting machine body 10 around the vertical oscillation support shaft 10a can be increased.

[0077] As shown in Figure 4, when the cutting machine body 10 is at top dead center, the entire electric motor 23 is positioned behind the vertical pivot shaft 10a. Therefore, the load of the electric motor 23 can be used to swing the cutting machine body 10 upward and return it to top dead center. This allows for a reduction in the spring load of the torsion spring that biases the cutting machine body 10 toward top dead center.

[0078] As shown in Figures 10 and 14, the motor shaft 23a is inclined parallel to or at an angle of 10° or less relative to the side surface of the cutting tool 11 when viewed from the radial direction of the motor shaft 23a, with the cutting tool 11 in a vertical position. Therefore, the motor shaft 23a can be positioned in a position along the side surface of the cutting tool 11. As a result, the electric motor 23 can be positioned closer to the cutting tool 11 in the axial direction of the output shaft 37. This makes the cutting machine body 10 more compact in the axial direction of the output shaft 37.

[0079] As shown in Fig. 10, the motor shaft 23a, which is the center of the electric motor 23, is arranged at a position 30 to 50% of the distance from the cutting tool 11 to the slide bar 51 in the plane direction of the cutting tool 11 starting from the cutting tool 11. Therefore, the motor shaft 23a is arranged closer to the cutting tool 11 than the slide bar 51. Thus, the center of gravity of the cutting machine body 10 can be brought closer to the cutting tool 11 in the axial direction of the output shaft 37. As a result, when the cutting machine body 10 is moved downward to cut the cutting tool 11 into the workpiece to be cut, the torsional moment caused by the reaction force received by the cutting tool 11 from the workpiece to be cut and the weight of the cutting machine body 10 can be reduced.

[0080] As shown in Figs. 10 and 14, the electric motor 23 is a brushed motor that is driven by supplying power from an AC power source. Therefore, even when a brushed motor with a relatively large motor diameter is provided, it is possible to suppress the visibility being obstructed by the brushed motor when checking the cutting position of the cutting tool 11. Also, even when a brushed motor is provided, the distance between the cutting tool 11 and the slide bar 51 in the axial direction of the output shaft 37 can be shortened.

[0081] As shown in Fig. 4, the slide bar 51 has a plurality of bars arranged in parallel. The plurality of bars includes a first bar 51a located at the uppermost position and a second bar 51b located at the lowermost position. When the diameter 51e of the first bar 51a is a [mm], the diameter 51f of the second bar 51b is b [mm], the center-to-center distance 51g between the first bar 51a and the second bar 51b is c [mm], and the diameter 11a of the cutting tool 11 is d [mm], the relationship (a / 2 + b / 2 + c) × 2 < d < (a / 2 + b / 2 + c) × 3.5 is satisfied. Therefore, the plurality of bars can be compactly accommodated within a range of a length shorter than half of the diameter 11a of the cutting tool 11 in the vertical direction. Moreover, the vertical distance including all of the plurality of bars is larger than 2 / 7 times the diameter 11a of the cutting tool 11. Therefore, a plurality of bars can be provided so as to have sufficient strength to support the cutting machine body 10. Thus, it is possible to achieve both the compactness and the support strength of the slide structure of the cutting machine body 10.

[0082] As shown in Figures 5-7, the motor shaft 23a is oriented with an inclination angle that tilts upward toward the rear when the cutting machine body 10 is at its bottom dead center. Therefore, the amount of downward protrusion of the electric motor 23 can be minimized when the cutting machine body 10 is at its bottom dead center. This makes the tabletop cutting machine 1 compact in the vertical direction.

[0083] As shown in Figures 5-7, the inclination angle of the motor shaft 23a is 30° to 60° with respect to the horizontal when the cutting machine body 10 is at its bottom dead center. Therefore, it is possible to prevent the motor housing 20, which houses the electric motor 23, from coming into contact with the material to be cut. As a result, the material to be cut can be effectively cut using the compactly designed tabletop cutting machine 1.

[0084] As shown in Figure 4, the motor shaft 23a is parallel to the horizontal line or at an inclination angle of 10° or less relative to the horizontal line when the cutting machine body 10 is at top dead center. Therefore, the amount of upward or downward protrusion of the electric motor 23 can be suppressed. This prevents obstruction of visibility when checking the cutting position of the blade tool 11.

[0085] As shown in Figures 8 and 10, the tabletop cutting machine 1 has an operating handle 41 used to move the cutting machine body 10 relative to the slide bar 51. The center 41a of the operating handle 41 is located on a virtual plane containing the cutting tool 11 when viewed from the front with the cutting tool 11 in a vertical position, or between the slide bar 51 and the cutting tool 11. Therefore, the center 41a of the slide bar 51 and the operating handle 41 can be brought closer in the axial direction of the output shaft 37. As a result, when the user grips the operating handle 41 and makes the cutting tool 11 cut into the material to be cut, the torsional moment of the cutting machine body 10 relative to the slide bar 51 can be reduced. Furthermore, the center 41a of the cutting tool 11 and the operating handle 41 can be brought closer in the axial direction of the output shaft 37. As a result, when the user grips the operating handle 41 and makes the cutting tool 11 cut into the material to be cut, the torsional moment due to the reaction force received by the cutting tool 11 from the material to be cut and the operating force used to operate the operating handle 41 can be reduced.

[0086] As shown in Figure 10, the center 41a of the operating handle 41 is positioned at 30-70% of the axial distance from the cutting tool 11 to the slide bar 51, with the cutting tool 11 as the starting point. Therefore, the center 41a of the operating handle 41 is positioned not too far from both the cutting tool 11 and the slide bar 51. This reduces the torsional moment of the cutting machine body 10 acting between the cutting tool 11 and the operating handle 41. Moreover, it suppresses the deflection of the slide bar 51 caused by the operating force used to operate the operating handle 41.

[0087] As shown in Figure 13, the tabletop cutting machine 1 has a bottom dead center stopper 17 that restricts the cutting machine body 10 from moving below the bottom dead center. The center 17a of the bottom dead center stopper 17 is located between the slide bar 51 and the cutting tool 11 when viewed from the front with the cutting tool 11 in a vertical position. Therefore, the distance between the center 17a of the bottom dead center stopper 17 and the slide bar 51 can be shortened in the axial direction of the output shaft 37. The bottom dead center stopper 17 receives a reaction force when the cutting machine body 10 descends to the bottom dead center. Therefore, by shortening the distance, the torsional moment of the cutting machine body 10 relative to the slide bar 51 due to the reaction force can be reduced.

[0088] As shown in Figure 13, the center 17a of the bottom dead center stopper 17 is positioned at 30-70% of the axial distance from the cutting tool 11 to the slide bar 51, with the cutting tool 11 as the starting point. Therefore, the center 17a of the bottom dead center stopper 17 is positioned so as not to be too far from both the cutting tool 11 and the slide bar 51. This reduces the torsional moment of the cutting machine body 10 acting between the reaction force on the bottom dead center stopper 17 and the slide bar 51, and suppresses the wobble of the cutting tool 11 caused by the torsional moment.

[0089] Next, a second embodiment of the present disclosure will be described with reference to Figures 16 to 21. The tabletop cutting machine 70 has a cutting machine body 71 instead of the cutting machine body 10 of the tabletop cutting machine 1 shown in Figure 1. The cutting machine body 71 is supported so as to be able to swing vertically with respect to the slide base 52, with respect to an up-and-down swing pivot shaft 71a located behind the cutting tool 11. The cutting machine body 10 is provided with a motor housing 73 that houses an electric motor 74 and a battery mounting portion 78 to which a rechargeable battery 79 can be attached.

[0090] As shown in Figures 16 and 20, the motor housing 73 is provided between the cutting tool 11 and the slide bar 51 in the left-right direction. The motor housing 73 has a substantially cylindrical shape that extends in the front-rear direction. The electric motor 74 is a motor called a DC brushless motor, which is powered and driven by a DC power source such as a battery 79. A motor shaft 74a is provided in the center of the electric motor 74. The motor shaft 74a extends in the front-rear direction along the motor axis J, which is parallel to the side surface of the cutting tool 11. The left-right position and extension direction of the motor axis J between the cutting tool 11 and the slide bar 51 are substantially the same as the motor axis J shown in Figure 10.

[0091] As shown in Figure 21, the motor shaft 74a is rotatably supported about the motor axis J by a first bearing 74g and a second bearing 74h. The inner ring of the first bearing 74g is press-fitted onto the rear end of the motor shaft 74a, and the outer ring is press-fitted into a hole provided at the inner rear end of the motor housing 73. The inner ring of the second bearing 74h is press-fitted onto the front of the motor shaft 74a, and the outer ring is press-fitted into a hole 81c provided at the rear end of the gear housing 81, which will be described later. The second bearing 74h is prevented from coming out of the hole 81c by a washer 74i.

[0092] As shown in Figure 21, the stator 74c of the electric motor 74 is supported non-rotatably on the inner circumferential surface of the motor housing 73. The rotor 74b of the electric motor 74 is positioned on the inner circumferential side of the stator 74c. The rotor 74b is mounted along the outer circumference of the motor shaft 74a and is rotatable together with the motor shaft 74a. A sensor board 74d for detecting the rotation angle of the rotor 74b is provided behind the rotor 74b. A fan 75 for introducing cooling air into the motor housing 73 is integrally mounted between the rotor 74b and the second bearing 74h in the front-rear direction at the front of the motor shaft 74a. When the electric motor 74 is driven and the fan 75 rotates, cooling air flows from the rear to the front of the motor housing 73.

[0093] As shown in Figure 20, the cutting machine body 71 has a power transmission unit 80 that transmits the driving force of the motor shaft 74a to the output shaft 37 between the cutting tool 11 and the slide bar 51 in the left-right direction. The power transmission unit 80 is housed in a gear housing 81 and a gear housing 12a provided on the right side of the fixed cover 12. The gear housing 81 connects the opening at the front end of the motor housing 73 to the opening at the right end of the gear housing 12a.

[0094] As shown in Figure 21, the gear housing 81 is provided with a motor housing connecting portion 81a that opens towards the rear at its rear end and a fixed cover connecting portion 81b that opens towards the left at its left side, both of which are in internal communication. The front end 73a of the motor housing 73 and the motor housing connecting portion 81a at the rear end of the gear housing 81 are connected by a plurality of fixing screws 81e (see Figure 17) that extend along the motor axis J direction. A drive-side bevel gear 74e is integrally attached to the front end of the motor shaft 74a. A nut 74f is attached in front of the drive-side bevel gear 74e to prevent it from coming off. The drive-side bevel gear 74e enters the gear housing 81.

[0095] As shown in Figure 21, the fixed cover connecting portion 81b is connected to the gear housing connecting portion 12d by a spigot joint that covers the outer circumference. The fixed cover connecting portion 81b and the gear housing connecting portion 12d are connected by a plurality of fixing screws 81f that extend in a direction substantially perpendicular to the side surface of the cutting tool 11. The gear housing 81 and the gear housing portion 12a support the first intermediate shaft 35, the second intermediate shaft 36, and the output shaft 37 so as to be rotatable around axes that extend in the left-right direction. On the left side surface of the gear housing 81, the bearing box 34 is connected by a plurality of fixing screws 34d that extend in a direction substantially perpendicular to the side surface of the cutting tool 11.

[0096] As shown in Figure 21, a hole 81d is provided on the right side inside the gear housing 81. The outer ring of the fifth bearing 35c, which is press-fitted onto the right end of the first intermediate shaft 35, is press-fitted into the hole 81d. The driven bevel gear 35a, which is mounted on the right side of the first intermediate shaft 35, meshes with the drive-side bevel gear 74e of the motor shaft 74a. By positioning both the second bearing 74h and the fifth bearing 35c in the holes 81c and 81d provided in the gear housing 81, the position of the motor shaft 74a and the first intermediate shaft 35 can be made highly accurate. Furthermore, the meshing between the drive-side bevel gear 74e and the driven-side bevel gear 35a can be made highly accurate.

[0097] As shown in Figures 17 and 18, the electric motor 74 and the power transmission unit 80 are positioned above the first bar 51a when the cutting machine body 71 is at top dead center with the cutting tool 11 in a vertical position. The motor shaft 74a is parallel to the horizontal line when the cutting machine body 71 is at top dead center. When the cutting machine body 71 is at top dead center, it is positioned in front of the vertical pivot shaft 71a.

[0098] As shown in Figures 19 and 20, the electric motor 74 and the power transmission unit 80 overlap the slide bar 51 in the vertical direction when the cutting machine body 71 is at bottom dead center with the cutting tool 11 in a vertical position. The motor shaft 74a tilts upward toward the rear when the cutting machine body 71 is at bottom dead center. The tilt angle is in the range of 30 to 60° with respect to the horizontal line, more preferably in the range of 35 to 45°, for example, 40°. The entire motor shaft 74a is located in front of the vertical pivot shaft 71a even when the cutting machine body 71 is at bottom dead center.

[0099] As shown in Figures 17 and 21, a rectangular box-shaped controller housing 76 is connected to the rear of the motor housing 73. The second connecting portion 44b of the carrying handle 44 is connected to the top of the controller housing 76. The controller housing 76 houses a controller 77 that controls the driving of the electric motor 74, etc. The controller 77 has a shallow, roughly rectangular case and a control board housed inside the case and molded in resin. The controller 77 is housed in the controller housing 76 in a position where its thickness direction (the direction in which the shortest side of the case extends) is aligned with the front-to-back direction in which the motor axis J extends. The controller 77 is equipped with a control circuit, drive circuit, auto-stop circuit, etc., mainly for controlling the operation of the electric motor 74. The control circuit has a microcontroller that transmits a control signal to the electric motor 74 based on the position information of the rotor 74b obtained by the sensor board 74d. The drive circuit has an FET that switches the current of the electric motor 74 based on the control signal received from the control circuit. The auto-stop circuit cuts off the power supply to the electric motor 74 to prevent over-discharge or overcurrent conditions, depending on the detected state of the battery 79.

[0100] As shown in Figures 17 and 21, a battery mounting section 78 is provided at the rear of the controller housing 76. The mounting surface of the battery mounting section 78 faces rearward and extends approximately perpendicular to the motor axis J when the cutting machine body 71 is at top dead center. A roughly rectangular box-shaped battery 79 can be mounted in the battery mounting section 78 by sliding it from top to bottom. The battery 79 can also be removed from the battery mounting section 78 by sliding it from bottom to top. The battery 79 is, for example, a lithium-ion battery with an output voltage of 36V. The battery 79 can be removed from the battery mounting section 78 and repeatedly recharged using a separately provided charger. The battery 79 can be reused as a power source between other rechargeable power tools such as screw tighteners and electric drills.

[0101] As described above, the tabletop cutting machine 70 has a long slide bar 51 that extends in the front-rear direction, as shown in Figures 4 and 20. The tabletop cutting machine 70 has a slide base 52 that is mounted on the slide bar 51 and slides in the front-rear direction along the slide bar 51. The tabletop cutting machine 70 has a cutting machine body 71 that is mounted on the slide base 52 so as to be able to swing in the vertical direction around a vertical pivot shaft 71a provided on the slide base 52. The cutting machine body 71 has an output shaft 37 that extends in an axial direction perpendicular to the slide bar 51 and to which the cutting tool 11 is attached. The cutting machine body 71 has an electric motor 74 that is a power source for driving the output shaft 37 and is located between the cutting tool 11 and the slide bar 51 when viewed from the front with the cutting tool 11 in a vertical position, and is located above the slide bar 51. The cutting machine body 71 has a power transmission unit 80 that transmits the driving force of the motor shaft 74a of the electric motor 74 to the output shaft 37. The power transmission unit 80 is located between the cutting tool 11 and the slide bar 51 when viewed from the front, and is positioned above the slide bar 51 when the cutting machine body 71 is at top dead center. Therefore, the tabletop cutting machine 70 has the same effect as the tabletop cutting machine 1 shown in Figures 4 and 10. That is, the cutting tool 11 can be positioned closer to the slide bar 51. Moreover, when the cutting machine body 71 is at top dead center, the visibility of the cutting position of the cutting tool 11 is improved.

[0102] Various modifications can be made to the desktop cutting machine 1,70 of this embodiment described above. The cutting machine body 10,71 is supported so as to be movable in the front-rear direction by a slide bar 51 attached to the body support arm 50. The body support arm 50 is supported so as to be tiltable with respect to the arm support portion 4b of the turntable 4. Alternatively, the body support arm 50 may be directly supported on the base 2 or the mounting surface. This can also be applied to desktop cutting machines that do not have a left-right tilt angle adjustment mechanism that allows the cutting machine body 10,71 to tilt in the left-right direction, or a miter angle adjustment mechanism that allows the turntable 4 to rotate horizontally with respect to the base 2.

[0103] The cutting machine bodies 10 and 71 may have their left-right arrangement reversed from that of the present disclosure. That is, the cutting tool 11 may be placed on the right side, the slide bar 51 on the left side, and the electric motors 23 and 74, the handle 40, the bottom dead center stopper 17, etc., may be placed between the cutting tool 11 and the slide bar 51 in the left-right direction.

[0104] Although a slide bar 51 including two bars 51a and 51b has been illustrated, there may be only one bar, or three or more bars arranged side by side. The slide bar 51 may not be parallel to the side of the cutting tool 11. The slide bar 51 may not be parallel to the horizontal line. An example of electric motors 23 and 74 has been illustrated in which the motor axis J is parallel to the horizontal line when the cutting machine body 10 and 71 is at top dead center. Alternatively, when the cutting machine body 10 and 71 is at top dead center, the motor axis J may extend upward or downward toward the opposite side of the gear (rear).

[0105] An example is shown of a power transmission section 30, 80 that transmits power to the output shaft 37 by reducing the power in two stages using the reduction gear 35b of the first intermediate shaft 35 and the reduction gear 36a of the second intermediate shaft 36. Alternatively, for example, only one intermediate shaft or three or more intermediate shafts may be provided. An example is shown of a configuration in which the operating handle 41 is in a loop shape extending in the left-right direction. Alternatively, the operating handle 41 may be provided in a loop shape extending in the front-rear direction parallel to the motor axis J. An example is shown of a configuration in which the top dead center stopper 18 is provided to the left of the fixed cover 12. Alternatively, the top dead center stopper 18 may be provided between the cutting tool 11 and the slide bar 51 in the left-right direction, similar to the bottom dead center stopper 17. [Explanation of Symbols]

[0106] 1… Tabletop cutting machine 2...base, 2a...rotating pivot shaft 3...Upward protrusion 4...Turntable, 4a...Top surface of the table, 4b...Arm support 5...Table extension, 5a...Groove 6...Positioning fence, 6a...Upper extension fence, 6b...Positioning surface 7…Miter scale plate, 7a…Fixing screw, 7b…Positioning recess 8…Indicator 9… Knob 10...Cutting machine body, 10a...Vertical swing support shaft 11...cutting tool, 11a...diameter 12...Fixed cover, 12a...Gear housing, 12b,12c...Hole 12d...Gear housing connection part 13…Movable cover 14… Fixing screws 15…Outer flange 16…Inner flange 17...Bottom dead center stopper, 17a...Center 18... Top dead center stopper 19...Bottom dead center lock pin, 19a...Through hole 20…Motor housing 21...Rear housing, 21a...Front end, 21b...Fixing screw 22...Front housing, 22a...Rear end, 22b...Shaft support part, 22c,22d...Hole 22e... Fixing screw 23...Electric motor, 23a...Motor shaft, 23b...Stator, 23c...Rotor 23d...commutator, 23e...first bearing, 23f...second bearing 24...fan 25…Power cord 30...Power transmission section 31… Shaft housing, 31a… Motor housing connection part 31b...Gear housing connecting section (enlarged diameter section) 32...shaft, 32a...drive end, 32b...driven end, 32c...diameter 32d...Connecting sleeve, 32e...Drive side bevel gear, 32f...Nut 32g…3rd bearing, 32h…4th bearing, 32i…washer, 32j…length 33... Gear housing, 33a... Shaft housing connection 33b...Fixed cover connecting part, 33c, 33d...Hole 33e, 33f… Fixing screws 34...Bearing box, 34a, 34b, 34c...Hole, 34d...Fixing screw 35...First intermediate shaft, 35a...Dependent bevel gear, 35b...Reduction gear, 35c...Fifth bearing 35d…6th bearing, 35e…washer, 35f…rubber ring, 35g…washer 35h... Wheel chocks 36...Second intermediate shaft, 36a...Reduction gear, 36b...Seventh bearing, 36c...Eighth bearing 37…Output shaft, 37a…Reduction gear, 37b…9th bearing, 37c…10th bearing 40...Handle section 41...Operating handle, 41a...Center 42…Switch lever 43... Lock-off button 44... Carrying handle, 44a... First connecting part, 44b... Second connecting part 50...Main support arm, 50a...Left and right tilting support shaft, 50b...Upper part 51...Slide bar, 51a...First bar, 51b...Second bar, 51c, 51d...Center 51e, 51f…Diameter, 51g…Center distance 52...Slide base, 52a...Bottom dead center stopper contact part, 52b...Top dead center stopper contact part 60... Turntable locking mechanism 61... Grip section 62…Fixed rod 63…Positive locking mechanism 64...Lock release lever, 64a...Positioning pin 65...Tilt fixing mechanism 66...Tilt and locking operation unit, 66a...Transmission shaft 67...receiving part, 67a...elongated hole 70... Tabletop cutting machine 71...Cutting machine body, 71a...Vertical swing support shaft 73...motor housing, 73a...front end 74...Electric motor, 74a...Motor shaft, 74b...Rotor, 74c...Stator 74d...Sensor board, 74e...Drive bevel gear, 74f...Fixing screw, 74g...First bearing 74h...Second bearing, 74i...Washer 75...fan 76… Controller Housing 77… Controller 78...Battery mounting section 79…Battery 80...Power transmission section 81...Gear housing, 81a...Motor housing connection, 81b...Fixed cover connection 81c, 81d… Holes, 81e, 81f… Fixing screws J...Motor axis S1...First virtual plane S2...Second virtual plane

Claims

1. A benchtop cutting machine, A long slide bar extending in the front-rear direction; a slide base attached to the slide bar and slidable in the front-rear direction along the slide bar; a cutting machine body mounted so as to be swingable in the vertical direction about a vertical swing support shaft provided on the slide base; The cutting machine body is an output shaft extending in an axial direction perpendicular to the slide bar and to which a cutting tool is attached; an electric motor which is a power source for driving the output shaft, the electric motor being disposed between the cutting tool and the slide bar when viewed from the front with the cutting tool in a vertical state, and located above the slide bar when the cutting machine body is located at the top dead center; A bench cutter having a power transmission unit that transmits the driving force of the motor shaft of the electric motor to the output shaft, the power transmission unit being arranged between the cutting tool and the slide bar when viewed from the front and located above the slide bar when the cutting machine body is located at the top dead center.

2. A bench cutter, A long slide bar extending in the front-rear direction; a slide base attached to the slide bar and slidable in the front-rear direction along the slide bar; a cutting machine body mounted so as to be swingable in the vertical direction about a vertical swing support shaft provided on the slide base; The cutting machine body is an output shaft extending in an axial direction perpendicular to the slide bar and to which a cutting tool is attached; a power source for driving the output shaft, the power source including an electric motor that is disposed between the cutting tool and the slide bar when viewed from the front with the cutting tool in a vertical state and that is positioned above the slide bar when the cutting machine body is positioned at the top dead center; When the cutting machine body is located at the bottom dead center, the entirety of the electric motor is located between the output shaft and the vertical swing support shaft in the front-rear direction, A bench cutter, wherein the motor shaft of the electric motor is parallel to the side surface of the cutting tool or inclined at an angle of 10° or less with respect to the side surface when viewed from the radial direction of the motor shaft when the cutting tool is in a vertical position.

3. 2. The bench cutter according to claim 1, The power transmission unit of this bench cutter has a shaft that transmits driving force from the motor shaft to the output shaft, and the shaft intersects with the slide bar when viewed in the axial direction when the cutting machine body is positioned at the bottom dead center.

4. The bench cutter according to claim 3, A bench cutter, wherein the diameter of the shaft is 1 / 40 to 1 / 20 of the diameter of the cutting tool.

5. The bench cutter according to claim 3 or 4, A cylindrical shaft housing that accommodates the shaft is provided. The shaft housing of the bench cutter has an expanded diameter portion that expands in the radial direction of the shaft around the driven end of the shaft that is connected to the output shaft.

6. A bench cutter according to any one of claims 1, 3 to 5, A bench cutter in which the entirety of the electric motor is located between the output shaft and the vertical swing support shaft in the front-rear direction when the cutting machine body is located at the bottom dead center.

7. A bench cutter according to any one of claims 1 and 3 to 6, A bench cutter, wherein the motor shaft is parallel to a side surface of the cutting tool or inclined at an angle of 10° or less with respect to the side surface when viewed from a radial direction of the motor shaft when the cutting tool is in a vertical position.

8. A bench cutter according to any one of claims 1 to 7, A bench cutter, wherein the axial distance from the cutting tool to the slide bar is 3 / 4 or less of the diameter of the cutting tool.

9. A bench cutter according to any one of claims 1 to 8, A bench cutter in which the entire electric motor is located rearward of the vertical swing support shaft when the cutting machine body is located at the top dead center.

10. A bench cutter according to any one of claims 1 to 9, A bench cutter in which the center of the electric motor is disposed at a position that is 30 to 50% of the distance from the cutting tool to the slide bar in a direction perpendicular to the surface of the cutting tool, with the cutting tool as the starting point.

11. A bench cutter according to any one of claims 1 to 10, The electric motor of the bench cutter is a brushed motor that is driven by power supplied from an AC power source.

12. A bench cutter according to any one of claims 1 to 11, The slide bar has a plurality of bars arranged side by side, the plurality of bars including a first bar located at the top and a second bar located at the bottom; When the diameter of the first bar is a [mm], the diameter of the second bar is b [mm], the center distance between the first bar and the second bar is c [mm], and the diameter of the cutting tool is d [mm], (a / 2+b / 2+c)×2<d<(a / 2+b / 2+c)×3.5 A benchtop cutting machine that meets the requirements.

13. A bench cutter according to any one of claims 1 to 12, The motor shaft is oriented at an inclination angle that is inclined upward and rearward when the cutting machine body is located at the bottom dead center.

14. A bench cutter as claimed in claim 13, A bench cutter, wherein the inclination angle of the motor shaft is 30° to 60° with respect to the horizontal line.

15. A bench cutter according to claim 13 or 14, A bench cutter, wherein the motor shaft is parallel to the horizontal line or has an inclination angle of 10° or less with respect to the horizontal line when the cutting body is positioned at the top dead center.

16. A bench cutter according to any one of claims 1 to 15, an operating handle that is used when moving the cutting machine body relative to the slide bar; A bench cutter in which the center of the operating handle is located on an imaginary plane that includes the cutting tool when viewed from the front with the cutting tool in a vertical position, or between the slide bar and the cutting tool.

17. A bench cutter as claimed in claim 16, A bench cutter in which the center of the operating handle is disposed at a position that is 30 to 70% of the distance from the cutting tool to the slide bar in the axial direction, with the cutting tool as the starting point.

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