bench top cutting machine

Abstract

A table cutting machine is provided. A table cutting machine in which the visual confirmation of the cutting-in position of a tool is good and in which the tool can be brought close to a slide bar is needed. A table cutting machine (1) has a slide bar (51) that is elongated and extends in the front-rear direction, a slide base (52) that slides along the slide bar (51), and a cutting machine main body (10) that can swing in the up-down direction with a swing support shaft (10a) as a center. The cutting machine main body has an output shaft (37) that extends in an axis orthogonal to the slide bar (51) and that is used to mount a tool (11), an electric motor (23) that is disposed between the tool and the slide bar and above the slide bar in a state in which the tool is vertical, and a power transmission portion (30) that transmits the driving force of a motor shaft (23a) of the electric motor to the output shaft. The power transmission portion is disposed between the tool and the slide bar and above the slide bar when the cutting machine main body (10) is at the upper dead point. Accordingly, the visual confirmation is good.

Description

Technical Field

[0001] This invention relates to a benchtop cutting machine for cutting materials such as wood. Background Technology

[0002] This benchtop cutting machine has, for example, an elongated sliding rod and a sliding base mounted on and movable along the sliding rod. The cutting machine body is mounted on the sliding base. The cutting machine body has an electric motor and a generally circular cutter that rotates using the electric motor as a power source. The side of the cutter is parallel to the sliding rod. The cutting machine body can swing vertically relative to the sliding base. This rotates the cutter and moves the cutting machine body toward the workpiece placed below it. The cutter then cuts into the workpiece. Furthermore, by moving the cutting machine body along the extension direction of the sliding rod, the cutter moves horizontally relative to the workpiece. This allows the workpiece to be cut along the extension direction of the sliding rod.

[0003] When viewed from the front of the benchtop cutter, the sliding bar is positioned to the right of the right side of the cutter or to the left of the left side of the cutter so as not to obstruct its movement. In the invention described in Patent Document 1, a sliding bar extending along the side of the cutter is located to the right of the right side of the cutter. The motor housing, which houses the electric motor, is positioned above the cutter and protrudes to the left relative to the cutter, opposite to the sliding bar. Therefore, when the user visually confirms the cutter's entry point into the workpiece, the leftward protrusion of the motor housing can sometimes obstruct visual confirmation. Consequently, the user may sometimes need to look down to visually confirm the entry point.

[0004] In the invention described in Patent Document 2, a sliding rod extending along the side of the cutter is provided on the left side of the left side face of the cutter. A motor housing housing an electric motor is positioned to the right of the cutter, and is arranged in an inclined position when the cutter is vertical. When viewed from the front, the motor housing is tilted to the right and upwards. When the user visually confirms the cutter's entry point into the workpiece, the sliding rod located on the left side of the cutter sometimes obstructs visual confirmation. Therefore, the user sometimes has to look down to visually confirm the entry point.

[0005] Tabletop cutting machines can use electric motors that are powered by DC power sources such as rechargeable batteries (DC brushless motors) or AC power sources (AC brushed motors). In particular, the diameter of an AC brushed motor is larger than that of a DC brushless motor. Therefore, when the electric motor is positioned close to the cutter, it can be positioned between the cutter and the sliding rod, or, when viewed from a close distance, on the opposite side of the sliding rod with the cutter clamped in between. In the former case, the distance between the cutter and the sliding rod in the left-right direction increases; in the latter case, the distance between the electric motor and the sliding rod in the left-right direction also increases. Consequently, the torque on the cutting machine body centered on the sliding rod increases, making it difficult to maintain high mechanical rigidity of the cutting machine body. Therefore, the cutting accuracy of the cutter may sometimes decrease.

[0006] [Existing Technical Documents]

[0007] [Patent Literature]

[0008] Patent Document 1: Japanese Patent Publication No. 2005-279933; Patent Document 2: Japanese Patent Publication No. 2018-89867 Summary of the Invention

[0009] [The technical problem that the invention aims to solve]

[0010] As mentioned above, there is room for improvement in the configuration of the electric motor in a benchtop cutting machine to enhance the visual confirmation of the cutter's entry position, the mechanical rigidity of the cutting machine body, and the cutting accuracy of the cutter. Therefore, there is a need for a benchtop cutting machine that provides good visual confirmation of the cutter's entry position and allows the cutter to approach the sliding rod.

[0011] [Technical solutions used to solve technical problems]

[0012] According to one feature of the invention, a benchtop cutting machine has a sliding rod that is elongated and extends in a front-rear direction. The benchtop cutting machine has a sliding base mounted on the sliding rod and sliding along the sliding rod in the front-rear direction. The benchtop cutting machine has a cutting machine body mounted to be able to swing vertically about a vertical swing support shaft provided on the sliding base. The cutting machine body has an output shaft extending along an axial direction orthogonal to the sliding rod and used to mount a cutting tool. The cutting machine body has an electric motor, which is the power source for driving the output shaft. Viewed from the front with the cutting tool vertical, the electric motor is positioned between the cutting tool and the sliding rod and above the sliding rod. 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. Viewed from the front, the power transmission unit is positioned between the cutting tool and the sliding rod and above the sliding rod when the cutting machine body is at its top dead center.

[0013] Therefore, by providing a power transmission unit between the electric motor and the output shaft, the electric motor can be positioned above the sliding rod regardless of the cutting machine body's location from the top dead center to the bottom dead center. This allows the cutting tool to be positioned close to the sliding rod. Consequently, when the cutting machine body is at the top dead center, both the electric motor and the power transmission unit are also positioned above the sliding rod. Therefore, when the cutting machine body is at the top dead center, the visual confirmation of the cutting position of the cutting tool is excellent. Attached Figure Description

[0014] Figure 1 This is a perspective view of the benchtop cutting machine involved in the first embodiment, viewed from the left.

[0015] Figure 2 This is a 3D view of the benchtop cutting machine viewed from the right.

[0016] Figure 3 This is a 3D view of a benchtop cutting machine viewed from the right with the main body of the machine at the rear.

[0017] Figure 4 This is a right view of a benchtop cutting machine with the main body of the cutting machine at the top dead center.

[0018] Figure 5 This is a left view of a benchtop cutting machine with the main body at the bottom dead center and at the rear end.

[0019] Figure 6 This is a right view of a benchtop cutting machine with the main body of the cutting machine at the bottom dead center.

[0020] Figure 7 This is a right view of a benchtop cutting machine with the main body at the bottom dead center and at the rear end.

[0021] Figure 8 This is a top view of a benchtop cutting machine with the main body of the cutting machine at the bottom dead center.

[0022] Figure 9 This is a top view of a benchtop cutting machine with the main body at the bottom dead center and at the rear end.

[0023] Figure 10 This is a front view of a benchtop cutting machine with the main body of the cutting machine at the bottom dead center.

[0024] Figure 11 This is a front view of a benchtop cutting machine with the main body at the bottom dead center and tilted to the left.

[0025] Figure 12 This is a front view of a benchtop cutting machine with the main body at the bottom dead center and tilted to the right.

[0026] Figure 13 This is a rear view of a benchtop cutting machine with the main body of the cutting machine at the top dead center.

[0027] Figure 14 yes Figure 4 Sectional view XIV-XIV in the middle.

[0028] Figure 15 yes Figure 4 XV-XV sectional view in the figure.

[0029] Figure 16 This is a left view showing the cutting machine body of the tabletop cutting machine according to the second embodiment in the state of being at the top dead center.

[0030] Figure 17 This is a right view of a benchtop cutting machine with the main body of the cutting machine at the top dead center.

[0031] Figure 18 This is a right view of a benchtop cutting machine with the main body at the top dead center and at the rear end.

[0032] Figure 19 This is a right view of a benchtop cutting machine with the main body of the cutting machine at the bottom dead center.

[0033] Figure 20 This is a right view of a benchtop cutting machine with the main body at the bottom dead center and at the rear end.

[0034] Figure 21 yes Figure 17 The XXI-XXI sectional view.

[0035] [Explanation of reference numerals in the attached figures]

[0036] 1: Tabletop cutting machine; 2: Base; 2a: Rotary support shaft; 3: Upper protrusion; 4: Turntable; 4a: Upper surface of the turntable; 4b: Arm support; 5: Turntable extension; 5a: Slot; 6: Positioning baffle; 6a: Upper extension baffle; 6b: Positioning surface; 7: Dial scale plate; 7a: Fixing screw; 7b: Positioning recess; 8: Indicator; 9: Knob; 10: Cutting machine body; 10a: Up-and-down swing support shaft; 11: Cutting tool; 11a: Diameter; 12:

[0037] 12a: Gear housing; 12b, 12c: Holes; 12d: Gear housing connection; 13: Movable cover; 14: Fixing screw; 15: Outer flange; 16: Inner flange; 17: Lower dead center stop; 17a: Center; 18: Upper dead center stop; 19: Lower dead center locking 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; 22c, 22d: Holes; 22e: Fixing screw; 23: Electric motor; 23a: Motor shaft; 23b: Stator; 23c: Rotor; 23d: Commutator; 23e: First bearing; 23f: Second bearing; 24: Fan; 2 5: Power cord; 30: Power transmission part; 31: Shaft housing; 31a: Motor housing connection part; 31b: Gear housing connection part (expanded diameter part); 32: Shaft; 32a: Drive side end; 32b: Driven side 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 part; 33b: Fixing cover connection part; 33c, 33d: Hole; 33e, 33f: Fixing screw; 34: Bearing housing; 34a, 34b, 34c: Hole; 34d: Fixing screw; 35: 1st intermediate shaft; 35a: Driven side bevel gear; 35b: Reduction gear; 35c: 5th bearing; 35d: 6th bearing; 35e: Washer; 35f: Rubber ring; 35g: Washer; 35h: Retaining ring; 36: 2nd intermediate shaft; 36a: Reduction gear; 36b: 7th bearing; 36c: 8th bearing; 37: Output shaft; 37a: Reduction gear; 37b: 9th bearing; 37c: 10th bearing; 40: Handle; 41: Operating handle; 41a: Center; 42: Switch lever; 43: Lock release button; 44: Hand handle; 44a: 1st connecting part; 44b: 2nd connecting part; 50: Main support arm; 50a: Left and right tilting support shaft; 50b: Upper part; 51: Sliding rod; 51a: 1st rod; 51b: 2nd rod; 51c, 51d: Center; 51e, 51f: Diameter; 51g: Center distance; 52: Sliding base; 52a: Lower stop stop abutment part; 52b: Upper stop stop abutment part; 60: Turntable fixing mechanism; 61: Handle part; 62: Fixing rod; 63: Forced interlocking mechanism; 64: Lock release rod; 64a: Positioning pin; 65: Tilting fixing mechanism; 66: Tilting fixing operating part; 66a: Transmission shaft; 67: Bearing part; 67a: Long hole; 70: Tabletop cutting machine; 71: Cutting machine body; 71a: Up and down swing support shaft; 73: Motor housing; 73a: Front end; 74: Electric motor; 74a: Motor shaft; 74b: Rotor; 74c: Stator; 74d: Sensor substrate; 74e: Drive side bevel gear;74f: Fixing screw; 74g: First bearing; 74h: Second bearing; 74i: Washer; 75: Fan; 76: Controller housing; 77: Controller; 78: Battery mounting part; 79: Battery; 80: Power transmission part; 81: Gear housing; 81a: Motor housing connection part; 81b: Fixing cover connection part; 81c, 81d: Holes; 81e, 81f: Fixing screws; J: Motor shaft; S1: First imaginary plane; S2: Second imaginary plane. Detailed Implementation

[0038] According to another feature of the invention, the power transmission unit has a shaft that transmits driving force from the axial output shaft of the motor. When viewed axially from the bottom dead center of the cutting machine body, the shaft intersects with the sliding rod. Therefore, when viewed from the front when the cutting machine body is at the bottom dead center, the shaft is positioned between the cutter and the sliding rod. The electric motor is positioned above the shaft and above the sliding rod. Therefore, the axial distance between the cutter and the sliding rod on the output shaft can be shortened. This allows for higher maintenance of the mechanical rigidity of the cutting machine body, thereby suppressing any reduction in the cutting accuracy of the cutter.

[0039] According to another feature of the invention, the diameter of the shaft is 1 / 40 to 1 / 20 of the diameter of the tool. Therefore, the shaft can be configured with the strength required to support the electric motor and the axial distance between the tool and the sliding rod on the output shaft can be shortened.

[0040] According to another feature of the invention, a cylindrical shaft housing is provided for housing the shaft. The shaft housing has an enlarged portion that extends radially around the driven end of the shaft connected to the output shaft. Therefore, the shaft housing can be threadedly fastened axially to the housing on the output shaft side. This results in good assemblability and improved support rigidity of the shaft housing.

[0041] According to another feature of the invention, the axial distance of the output shaft from the cutter to the sliding rod is less than 3 / 4 of the cutter's diameter. Therefore, the axial distance of the output shaft from the cutter to the sliding rod can be minimized, thereby improving the mechanical rigidity of the cutting machine body supported by the sliding rod. Consequently, when the cutter enters the workpiece, axial deviation of the cutter on the output shaft can be suppressed.

[0042] According to another feature of the invention, when the cutting machine body is at the bottom dead center, the electric motor as a whole is positioned between the output shaft and the vertical swing support shaft in the longitudinal direction. Therefore, the center of gravity of the cutting machine body at the bottom dead center can be brought closer to the vertical swing support shaft. Thus, the variable load during the vertical swing of the cutting machine body can be reduced. The cutting machine body is subjected to force from the bottom dead center to the top dead center by springs mounted around the vertical swing support shaft. By reducing the variable load on the cutting machine body, the spring load on the springs can be reduced. Furthermore, the mechanical rigidity of the cutting machine body centered on the vertical swing support shaft can be improved.

[0043] According to another feature of the invention, when the cutting machine body is at the top dead center, the electric motor is located entirely behind the vertical swing support shaft. Therefore, the load of the electric motor can be used to swing the cutting machine body upwards and return it to the top dead center. Thus, the spring load of the spring that applies force to the cutting machine body at the top dead center can be reduced.

[0044] According to another feature of the invention, when viewed radially from the motor shaft with the cutter perpendicular, the motor shaft is parallel to the side of the cutter or inclined at less than 10° relative to the side. Therefore, the motor shaft can be configured in a position along the side of the cutter. Consequently, the electric motor can be positioned close to the cutter in the axial direction of the output shaft. This allows for a compact cutting machine body in the axial direction of the output shaft.

[0045] According to another feature of the invention, the center of the electric motor is positioned at 30-50% of the distance from the cutter to the sliding rod in the direction perpendicular to the cutter's face, originating from the cutter. Therefore, the center of the electric motor is positioned closer to the cutter than the sliding rod. This allows the center of gravity of the cutting machine body to be moved closer to the cutter in the axial direction of the output shaft. Consequently, the torque generated by the reaction force exerted by the cutter on the workpiece and the weight of the cutting machine body when the cutting machine body moves downwards and the cutter cuts into the workpiece can be reduced.

[0046] According to another feature of the invention, the electric motor is a brushed motor driven by AC power. Therefore, in the case of a brushed motor with a relatively large outer diameter, it is possible to prevent visual confirmation of the cutting position from being obstructed by the brushed motor. Furthermore, with a brushed motor, the axial distance between the cutting tool and the sliding rod on the output shaft can be shortened.

[0047] According to another feature of the invention, the sliding rod has a plurality of rods arranged in an array. The plurality of rods includes a first rod located at the top and a second rod located at the bottom. When the diameter of the first rod is set to a [mm], the diameter of the second rod to be b [mm], the center distance between the first and second rods to be c [mm], and the diameter of the cutter to be d [mm], the relationship (a / 2 + b / 2 + c) × 2 < d < (a / 2 + b / 2 + c) × 3.5 is satisfied. Therefore, the plurality of rods can be compactly housed in the vertical direction within a length shorter than half the diameter of the cutter. Furthermore, the vertical distance encompassing all the rods is greater than 2 / 7 times the diameter of the cutter. Therefore, the plurality of rods can be arranged in a manner that provides sufficient strength to support the main body of the cutting machine. In this way, both the compactness of the sliding structure of the cutting machine body and the supporting strength can be achieved.

[0048] According to another feature of the invention, the motor shaft is oriented with an angle that is tilted rearward and upward when the cutter body is at the bottom dead center. Therefore, the amount of downward protrusion of the electric motor when the cutter body is at the bottom dead center can be minimized. This allows the benchtop cutter to be compact in the vertical direction.

[0049] According to another feature of the invention, when the cutting machine body is at the bottom dead center, the tilt angle of the motor shaft relative to the horizontal line is 30° to 60°. Therefore, it is possible to prevent the motor housing housing the electric motor from coming into contact with the workpiece being cut. Thus, a compactly arranged benchtop cutting machine can be used to properly cut the workpiece.

[0050] According to another feature of the invention, when the cutting machine body is at its top dead center, the motor shaft is parallel to the horizontal line or has an inclination angle of less than 10° relative to the horizontal line. Therefore, the amount of upward or downward protrusion of the electric motor can be suppressed. Thus, visual confirmation of the cutting position of the tool can be prevented from being obstructed.

[0051] According to another feature of the invention, the benchtop cutter has an operating handle used when moving the cutter body relative to the sliding rod. Viewed from the front with the blade perpendicular, the center of the operating handle is located on an imaginary plane containing the blade or between the sliding rod and the blade. Therefore, the centers of the sliding rod and the operating handle can be brought closer together in the axial direction of the output shaft. This reduces the torque on the cutter body relative to the sliding rod when the user holds the operating handle and the blade cuts into the workpiece. Furthermore, the centers of the blade and the operating handle can be brought closer together in the axial direction of the output shaft. This reduces the torque generated by the reaction force of the blade from the workpiece and the operating force applied to the operating handle when the user holds the operating handle and the blade cuts into the workpiece.

[0052] According to another feature of the invention, the center of the operating handle is positioned at 30-70% of the axial distance from the cutter to the sliding rod, originating from the cutter. Therefore, the center of the operating handle is positioned not too far from either the cutter or the sliding rod. This reduces the torque acting on the cutting machine body between the cutter and the operating handle. Furthermore, it suppresses deflection of the sliding rod caused by the operating force applied to the operating handle.

[0053] According to another feature of the invention, the benchtop cutting machine has a lower stop stop that restricts the downward movement of the cutting machine body to the lower stop point. Viewed from the front with the cutter perpendicular, the center of the lower stop stop is located between the sliding rod and the cutter. Therefore, the axial distance between the center of the lower stop stop and the sliding rod on the output shaft can be shortened. The lower stop stop is subjected to a reaction force when the cutting machine body descends to the lower stop point. Therefore, by shortening the distance, the torque of the cutting machine body relative to the sliding rod generated by the reaction force can be reduced.

[0054] According to another feature of the invention, the center of the bottom stop stop is positioned at 30-70% of the axial distance from the cutter to the sliding rod, originating from the cutter. Therefore, the center of the bottom stop stop is positioned at a distance not too far from either the cutter or the sliding rod. Consequently, the torque on the cutting machine body between the reaction force acting on the bottom stop stop and the sliding rod can be reduced, and cutter deviation caused by torque can be suppressed.

[0055] according to Figures 1-15 The first embodiment of the present invention will be described below. In this embodiment, a benchtop cutting machine 1, referred to as a so-called sliding circular saw, is exemplified. Figure 1 , 2 As shown, the benchtop cutting machine 1 includes: a base 2, which is placed on a table, floor, etc.; a turntable 4 for holding the workpiece to be cut; and a cutting machine body 10. The turntable 4 is supported above the base 2 and is able to rotate horizontally about a rotation support shaft 2a extending vertically. The cutting machine body 10 is positioned above the turntable 4. A generally circular saw blade 11, called a tipped saw blade, is rotatably supported on the cutting machine body 10. The user performs the cutting operation near the benchtop cutting machine 1. In the following description, the front-back direction refers to the area in front as observed by the user. The up-down and left-right directions are defined based on the user.

[0056] like Figure 1 , 2As shown, the turntable 4 is roughly circular when viewed from above, and its upper surface 4a is horizontally positioned. The rotation support shaft 2a is located at the center of the roughly circular plate shape of the turntable 4. The base 2 has upper protrusions 3 at both ends, and the turntable 4 is horizontally rotatably supported within the space between the upper protrusions 3. Furthermore, in this embodiment, a larger turntable 4 than usual is used, and the left and right ends of the base 2 do not have mounting surfaces for placing the workpiece to be cut. The turntable 4 has a turntable extension 5 extending forward along the side of the cutter 11. A notch-shaped slot 5a extending along the side of the cutter 11 is provided at the center of the upper surface of the turntable extension 5. For convenience, the blade plate provided above the slot 5a is omitted.

[0057] like Figure 1 , 2 As shown, a wall-shaped positioning baffle 6 extending horizontally and upwards is provided above the turntable 4 and the upper protrusion 3. The positioning baffle 6 is supported by the left and right upper protrusions 3. The positioning surface 6b, which is the front surface of the positioning baffle 6, is located on a vertical plane passing through the rotation support shaft 2a, which is the rotation center of the turntable 4. The workpiece to be cut, placed on the turntable 4, is positioned in the front-rear direction by abutting against the positioning surface 6b. An upper extension baffle 6a, which extends the positioning surface 6b upwards, is detachably installed above the positioning baffle 6.

[0058] like Figure 1 , 2 As shown, an arc-shaped dial scale plate 7 is provided in approximately half of the front circumference of the base 2. The dial scale plate 7 extends horizontally below the upper surface 4a of the turntable. The dial scale plate 7 works in conjunction with indicators 8 provided on the left and right sides of the turntable 4 to display the rotation angle of the turntable 4. The rotation angle of the turntable 4 is the angle between the cutter 11 and the positioning surface 6b of the positioning baffle 6. By rotating the turntable 4 in either the left or right direction, the cutter 11 can be tilted relative to the positioning surface 6b of the positioning baffle 6. The action of cutting the workpiece with the cutter 11 in this posture is called mitercutting. A plurality of radially extending groove-shaped positioning recesses 7b are provided on the dial scale plate 7. The positioning recesses 7b are arranged at predetermined angles along the circumference of the dial scale plate 7. The tip of the positioning pin 64a, described later, can enter the positioning recess 7b. The dial scale plate 7 is fixed to the base 2 by a plurality of fixing screws 7a. A fixing screw 7a is inserted into an elongated hole that runs vertically through the dial scale plate 7. By loosening the fixing screw 7a, the dial scale plate 7 can be moved horizontally, allowing for fine adjustment of the angle between the positioning baffle 6 and the cutting tool 11. 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 baffle 6 can be precisely adjusted. This adjustment is primarily performed during the product manufacturing process.

[0059] like Figure 1 , 2 As shown, a generally cylindrical arm support 4b with the front-rear direction as the axial direction is provided at the rear of the turntable 4. A main support arm 50 extending generally upward is provided behind the arm support 4b. The main support arm 50 is supported by the arm support 4b and is able to tilt in the left-right direction relative to the arm support 4b with the left-right tilting support axis 50a extending in the front-rear direction as the center. The main support arm 50 tilts upward and generally to the right when the cutter 11 is vertical. When the sliding base 52 (described later) is moved to the rear end, the upper part 50b of the main support arm 50 is shaped to retract from the movable area of ​​the cutting machine body 10.

[0060] like Figure 1 , 2 As shown, an elongated sliding rod 51, parallel to the side of the cutter 11 and extending horizontally, is mounted on the upper part 50b of the main support arm. The sliding rod 51 has a first rod 51a above and a second rod 51b below, arranged vertically. A sliding base 52 is mounted on the first rod 51a and the second rod 51b in a manner that allows it to slide in the front-back direction. The cutting machine body 10 is connected to the left side of the sliding base 52. Therefore, when the cutter 11 is in a vertical position, the cutting machine body 10 is located to the left of the first rod 51a and the second rod 51b. By sliding the sliding base 52 in the front-back direction, it is possible to cut, for example, a wide workpiece placed on the turntable 4. A knob 9 is provided on the upper right side of the sliding base 52. By rotating the knob 9 in the tightening direction, the sliding base 52, which slides relative to the sliding rod 51, can be fixed in any position.

[0061] like Figure 4 , 10 As shown, the first rod 51a is formed into a cylindrical shape with a diameter 51e of, for example, 30 mm. The second rod 51b is formed into 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 rod 51a and the center 51d of the second rod 51b extend parallel to each other in the front-back direction. When the tool 11 is in a vertical position, the center 51c of the first rod 51a and the center 51d of the second rod 51b are approximately at the same position in the left-right direction. Furthermore, an imaginary plane passing through the center of the base of the tool 11 in the thickness direction and extending parallel to the side of the tool 11 is designated as the first imaginary plane S1. An imaginary plane passing through the center 51c of the first rod 51a and the center 51d of the second rod 51b is designated as the second imaginary plane S2. The first imaginary plane S1 and the second imaginary plane S2 are approximately parallel.

[0062] like Figure 4 , 10As shown, the tool 11 rotates around the output shaft 37. The distance between the first imaginary plane S1 and the second imaginary plane S2 in the left-right direction (the extension direction of the output shaft 37) is less than 3 / 4 of the diameter 11a of the tool 11, preferably less than 1 / 2 of the diameter 11a of the tool 11. The diameter 11a is set to 305 mm, and the distance between the first imaginary plane S1 and the second imaginary plane S2 is, for example, 132 mm. The center 51c of the first rod 51a and the center 51d of the second rod 51b are arranged in the vertical direction with a center distance 51g of, for example, 65 mm. The diameter 51e is set to a [mm], the diameter 51f is set to b [mm], the center distance 51g is set to c [mm], and the diameter 11a of the tool 11 is set to d [mm]. The diameters 51e, 51f and the center distance 51g are set in a manner that satisfies the following relationship (Equation 1). In the case of a benchtop cutting machine 1 equipped with a cutter 11 of, for example, diameter 11a of 305 mm, the diameters 51e and 51f and the center distance 51g are set in the manner of 305 / 3.5 = 87 [mm] < (a / 2 + b / 2 + c) < 305 / 2 = 153 [mm].

[0063] (Formula 1) (a / 2+b / 2+c)×2<d<(a / 2+b / 2+c)×3.5.

[0064] like Figure 11 , 12 As shown, the main support arm 50 can tilt up to 45° in the left and right directions, centered on the left and right tilt support shaft 50a. Furthermore, by switching the tilt positioning mechanism (located at the rear of the main support arm 50, but omitted in the drawing for convenience), it can tilt up to a maximum of 48°. Therefore, the cutter 11 can also tilt up to a maximum of 48° in the left and right directions, centered on the left and right tilt support shaft 50a. By tilting the cutter 11 in the left and right directions, a bevel cut can be performed on the workpiece placed on the turntable 4. When the cutting machine body 10 tilts to the left, there is no protrusion around the left side and lower part of the cutter 11 (in the figure, the movable cover 13 is located around the lower side of the cutter 11, but actually moves upwards). Therefore, the cutting machine body 10, except for the cutter 11, will not touch the workpiece, and a bevel cut can be performed appropriately. When the cutting machine body 10 tilts to the right, there are no protruding parts around the right side and the lower part of the blade 11. Therefore, the cutting machine body 10, except for the blade 11, will not touch the workpiece being cut, and bevel cutting can be performed appropriately.

[0065] like Figure 4 , 5As shown, the cutting machine body 10 can swing vertically relative to the sliding base 52 with respect to a vertical swing support shaft 10a extending in the left-right direction as its center. The vertical swing support shaft 10a is located behind the cutter 11. By swinging the cutting machine body 10 downward, the cutter 11 can cut into the workpiece placed on the turntable 4. Regarding the swing angle of the cutting machine body 10 in the vertical direction, with the lower dead center set to 0°, the upper dead center is 40°. In other words, the cutting machine body 10 can swing vertically within an angle range of 40°. A torsion spring is provided around the vertical swing support shaft 10a to exert an upward force on the cutting machine body towards the upper dead center.

[0066] like Figure 4 , 5 As shown, the cutting machine body 10 has a fixed cover 12 and a movable cover 13 covering the cutting tool 11. The fixed cover 12 covers the upper half-circumference of the cutting tool 11 from the left and right sides and radially outward. The movable cover 13 covers the lower half-circumference of the cutting tool 11. The movable cover 13 rotates in conjunction with the up-and-down swing of the cutting machine body 10, thereby opening and closing the lower half-circumference of the cutting tool 11. When the cutting machine body 10 is swinging upward, the movable cover 13 moves towards the closed position ( Figure 5 The cutting machine body 10 rotates clockwise. Therefore, when the cutting machine body 10 is at its top dead center, the lower half-circumference of the cutter 11 is covered. When the cutting machine body 10 is swung downwards, the movable cover 13 moves towards the open position (clockwise). Figure 5 (The rotation is counterclockwise). Therefore, the lower half of the circumference of the tool 11 is exposed, allowing the tool 11 to cut into the workpiece placed on the turntable 4.

[0067] like Figure 14 , 15 As shown, the cutter 11 is integrally mounted with the output shaft 37, which extends in the left-right direction and is rotatably supported by the cutter body 10. The cutter 11 is mounted on the output shaft 37 by screwing in the fixing screw 14 while it is held at the center of rotation by the outer flange 15 and the inner flange 16.

[0068] like Figure 13 As shown, a lower stop stop 17 is provided on the right side of the cutting machine body 10. The lower stop stop 17 has a bolt that is threaded to the cutting machine body 10 and protrudes downward. The protruding length of the lower stop stop 17 can be changed, for example, by inserting an Allen wrench into the hexagonal hole in the head of the bolt and rotating it. This allows for fine adjustment of the lower stop position of the cutting machine body 10. A lower stop stop abutment portion 52a (see reference) is provided on the front of the sliding base 52. Figure 4When the cutting machine body 10 descends to the lower stop point, the lower stop stop abutment portion 52a abuts against the top end of the lower stop stop member 17. The lower stop stop abutment portion 52a is a plane on the upper surface of the protrusion that protrudes forward on the front of the sliding base 52.

[0069] like Figure 13 As shown, the lower stop stop 17 is located between the side of the cutter 11 and the sliding rod 51 in the left-right direction. With the cutter 11 in a vertical position and the cutting machine body 10 at the upper stop, the center 17a of the lower stop stop 17 is located to the right of the first imaginary plane S1 passing through the center of the cutter 11 and to the left of the second imaginary plane S2 passing through the center 51c of the first rod 51a. The center 17a is preferably positioned at 30% to 70% of the distance from the first imaginary plane S1 to the second imaginary plane S2, perpendicular to the face of the cutter 11 and pointing to the right, for example, at 58% of that distance. The distance from the first imaginary plane S1 to the center 17a is, for example, 76.5 mm. In the case where the distance from the first imaginary plane S1 to the second imaginary plane S2 is 132 mm, then 76.5 mm / 132 mm = 58%.

[0070] like Figure 5 , 8 As shown in Figure 13, a top stop stop 18 protruding to the left is provided on the left side of the fixed cover 12. A planar top stop stop abutment part 52b is provided on the upper surface of the left side of the sliding base 52, which can abut against the top stop stop 18. By abutting against the top stop stop 18 and the top stop stop abutment part 52b, the upward movement of the cutting machine body 10 is stopped at the top stop.

[0071] like Figure 1 As shown, a lower stop locking pin 19 extending to the left is provided on the left side of the front portion of the sliding base 52. A through hole 19a is provided on the fixed cover 12, located in front of the upper stop stop 18 and extending in the left-right direction. When the cutting machine body 10 moves to the lower stop, the lower stop locking pin 19 can move to the right and enter the through hole 19a. By pressing the left end of the lower stop locking pin 19 to the right and causing it to enter the through hole 19a, the cutting machine body 10 can be locked at the lower stop.

[0072] like Figures 8-10As shown, the cutting machine body 10 has a motor housing 20 located between the cutter 11 and the sliding rod 51 in the left-right direction. An electric motor 23 is housed within the motor housing 20. A motor shaft 23a is positioned at the center of the electric motor 23. The motor shaft 23a extends in the front-rear direction along a motor axis J parallel to the side of the cutter 11. The motor housing 20 is formed by connecting a rear housing 21 at the rear and a front housing 22 in the front-rear direction. The rear housing 21 is a generally cylindrical shape extending in the front-rear direction. The front housing 22 is a generally conical shape with a diameter decreasing from rear to front. A power cord 25, capable of connecting to an external AC power source, is provided above the motor housing 20. The power cord 25 extends rearward along the length of the motor housing 20 (for convenience, only the power cord guard is shown in the figures, and other parts of the power cord 25 are omitted).

[0073] like Figure 14 As shown, the inner diameter of the front end 21a of the rear housing 21 is larger than the rear region of the rear housing 21. The inner diameter of the rear end 22a of the front housing 22 is larger 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 extending along the motor axis J (see reference). Figure 9 ) connected.

[0074] like Figure 4 , 14 As shown, the electric motor 23 is a brushed AC motor powered by an AC power source. The motor shaft 23a is supported by a first bearing 23e and a second bearing 23f, enabling it to rotate about the motor axis J. The inner ring of the first bearing 23e is pressed into the rear end of the motor shaft 23a, and the outer ring of the first bearing 23e is pressed into a hole located at the inner rear end of the rear housing 21. A cylindrical shaft support portion 22b extending in the front-rear direction is provided inside the front housing 22. The inner ring of the second bearing 23f is pressed into the front of the motor shaft 23a, and the outer ring of the second bearing 23f is pressed into a hole 22c located at the rear end of the shaft support portion 22b.

[0075] like Figure 14As shown, the stator 23b of the electric motor 23 is supported on the inner circumferential surface of the rear housing 21 in a non-rotatable manner. The rotor 23c of the electric motor 23 is disposed 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 capable of rotating with the motor shaft 23a. A commutator 23d is mounted behind the rotor 23c. An air inlet for drawing in external air is provided at the rear of the rear housing 21. A fan 24 is mounted at the front of the motor shaft 23a and between the second bearing 23f and the rotor 23c, in a manner capable of rotating integrally 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 to rotate the fan 24, cooling air is introduced into the motor housing 20 from the air inlet. The cooling air flows toward the forward fan 24 and is discharged from the exhaust port of the front housing 22, which is located radially outward of the fan 24. The electric motor 23 is cooled by cooling air.

[0076] like Figure 8 , 10 As shown, the cutting machine body 10 has a power transmission section 30 located in the left-right direction between the cutter 11 and the sliding rod 51, which transmits the driving force of the motor shaft 23a to the output shaft 37. The power transmission section 30 is housed in a shaft housing 31, a gear housing 33, and a gear receiving section 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 receiving section 12a.

[0077] like Figure 14 As shown, the shaft housing 31 is generally cylindrical, extending along the side of the cutter 11. The outer diameter of the motor housing connection portion 31a at the rear end and the gear housing connection portion 31b at the front end of the shaft housing 31 is larger than that of the central region of the shaft housing 31. The inner diameter of the gear housing connection portion 31b is larger than that of the motor housing connection portion 31a. The motor housing connection portion 31a is connected to the front end of the front housing 22 by a sleeve covering the outer periphery of the shaft support portion 22b. The motor housing connection portion 31a and the front end of the front housing 22 are connected by a plurality of fixing screws 22e extending along the motor axis J. The gear housing connection portion 31b is connected by a plurality of fixing screws 33e extending along the motor axis J (see reference). Figure 4 The shaft housing connection portion 33a is connected to the rear end of the gear housing 33.

[0078] like Figure 14As shown, a long, linearly extending shaft 32 is housed within the shaft housing 31. The shaft 32 is coaxially configured with the motor shaft 23a. The shaft 32 is cylindrical, with a diameter 32c that is 1 / 40 to 1 / 20 of the diameter 11a of the tool 11. The diameter 11a of the tool 11 is set to 305 mm, and the diameter 32c is, for example, 10 mm. The front end of the motor shaft 23a and the rear drive-side end 32a of the shaft 32 are connected by inserting a cylindrical connecting sleeve 32d in a manner that allows rotational power to be transmitted. The shaft 32 is a long shaft type drive shaft, with a length (length / diameter) of 10 to 20 relative to its unit diameter. For example, relative to a diameter 32c of 10 mm, the length 32j is 127 mm, and in this case, 127 mm / 10 mm [=length 32j / diameter 32c] is 12.7. The material used is alloy steel for mechanical structures, such as chromium-molybdenum steel (SCM material) or nickel-chromium-molybdenum steel (SNCM material). For example, chromium-molybdenum steel can be used.

[0079] like Figure 14 As shown, shaft 32 is supported by third bearing 32g and fourth bearing 32h, enabling it to rotate around motor axis J. The inner ring of third bearing 32g is pressed into the rear of shaft 32, and the outer ring of third bearing 32g is pressed into hole 22d provided at the front end of shaft support portion 22b. The inner ring of fourth bearing 32h is pressed into the front of shaft 32, and the outer ring of fourth bearing 32h is pressed into hole 33c provided at the rear end of shaft housing connecting portion 33a of gear housing 33. Fourth bearing 32h is prevented from falling out of hole 33c by washer 32i. With second bearing 23f and third bearing 32g both positioned in holes 22c and 22d provided in front housing 22, high positional accuracy of motor shaft 23a, shaft 32, and first intermediate shaft 35 is achieved. Drive-side bevel gear 32e is integrally mounted on driven end 32b at the front of shaft 32. A nut 32f for preventing detachment is installed in front of the drive-side bevel gear 32e. The drive-side bevel gear 32e enters the gear housing 33.

[0080] like Figure 14 , 15 As shown, the gear housing 33 is configured to be internally connected by a shaft housing connecting portion 33a opening rearward at the rear end and a fixing cover connecting portion 33b opening leftward at the left side. The gear receiving portion 12a of the fixing cover 12 is configured to be internally connected by a gear housing connecting portion 12d opening rightward at the right end and an opening protruding from the cutter 11 of the output shaft 37 towards the left. The fixing cover connecting portion 33b is connected by a sleeve that covers the outer periphery of the gear housing connecting portion 12d. The fixing cover connecting portion 33b and the gear housing connecting portion 12d are connected by a plurality of fixing screws 33f extending in a direction substantially orthogonal to the side of the cutter 11.

[0081] like Figure 14 ,15 As shown, the first intermediate shaft 35, the second intermediate shaft 36, and the output shaft 37 are supported by the gear housing 33 and the gear receiving portion 12a in a manner rotatable about their axes. The first intermediate shaft 35, the second intermediate shaft 36, and the output shaft 37 extend in a left-right direction orthogonal to the side of the tool 11. The bearing housing 34 is connected to the left side of the gear housing 33 by a plurality of fixing screws 34d extending in a direction substantially orthogonal to the side of the tool 11. The bearing housing 34 holds the bearings that support the first intermediate shaft 35, the second intermediate shaft 36, and the output shaft 37 respectively.

[0082] like Figure 14 As shown, 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 pressed into the right end of the first intermediate shaft 35, and the outer ring of the fifth bearing 35c is pressed into the hole 33d provided on the right side of the inside of the gear housing 33. The inner ring of the sixth bearing 35d is pressed into the left end of the first intermediate shaft 35, and the outer ring of the sixth bearing 35d is pressed into the hole 34a provided in the bearing housing 34. By positioning the fourth bearing 32h and the fifth bearing 35c in the holes 33c and 33d provided in the gear housing 33, the positional accuracy of the shaft 32 and the first intermediate shaft 35 can be high. Moreover, the meshing accuracy of the drive-side bevel gear 32e and the driven-side bevel gear 35a can be high.

[0083] like Figure 14 As shown, the driven bevel gear 35a is inserted into the right side of the first intermediate shaft 35 in a transitional fit, allowing axial movement. The driven bevel gear 35a and the first intermediate shaft 35 are anti-rotated relative to each other by the engagement of a key and a keyway. On the right side of the driven bevel gear 35a, a steel washer 35e, a rubber ring 35f, and a steel washer 35g are mounted on the first intermediate shaft 35. A retaining ring 35h is installed on the rubber ring 35f, which is held by the washers 35e and 35g, in a manner that allows it to be crushed axially. The rubber ring 35f buffers impacts and vibrations between the first intermediate shaft 35 and the driven bevel gear 35a. The driven bevel gear 35a meshes with the driving bevel gear 32e. The rotational power of the shaft 32 is reduced and its rotational direction is converted to approximately perpendicular and transmitted to the first intermediate shaft 35 via the meshing of the driving bevel gear 32e and the driven bevel gear 35a. In the left-right direction, between the driven bevel gear 35a and the sixth bearing 35d, the reduction gear 35b and the first intermediate shaft 35 are formed as an integral component.

[0084] like Figure 15As shown, the second intermediate shaft 36 is rotatably supported by the seventh bearing 36b and the eighth bearing 36c. The inner ring of the seventh bearing 36b is pressed into the right end of the second intermediate shaft 36, and the outer ring of the seventh bearing 36b is pressed into the hole 12b located on the right side of the gear housing 12a. The inner ring of the eighth bearing 36c is pressed into the left end of the second intermediate shaft 36, and the outer ring of the eighth bearing 36c is pressed into the hole 34b located in the bearing housing 34. In the left-right direction, a reduction gear 36a is integrally formed with the second intermediate shaft 36 between the seventh bearing 36b and the eighth bearing 36c. The reduction gear 36a meshes with the 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.

[0085] like Figure 15 As shown, the output shaft 37 is rotatably supported by the 9th bearing 37b and the 10th bearing 37c. The inner ring of the 9th bearing 37b is pressed into the right end of the output shaft 37, and the outer ring of the 9th bearing 37b is pressed into the hole 12c located on the right side of the gear housing 12a. The inner ring of the 10th bearing 37c is pressed into the center of the output shaft 37, and the outer ring of the 10th bearing 37c is pressed into the hole 34c located in the bearing housing 34. In the left-right direction, between the 9th bearing 37b and the 10th bearing 37c, the reduction gear 37a is formed as an integral part with the output shaft 37. The reduction gear 37a meshes with the 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 gear 36a and the reduction gear 37a. Thus, through the motor shaft 23a (see reference...) Figure 14 The rotational power of the tool 11 is reduced and transmitted to the output shaft 37, thereby causing the tool 11 to rotate.

[0086] like Figures 4-7 As shown, when the cutter 11 is vertical and the cutting machine body 10 is in any position from the top dead center to the bottom dead center, the electric motor 23 is always located above the first rod 51a. When the cutter 11 is vertical and the cutting machine body 10 is at the top dead center, the shaft 32 is located above the first rod 51a. When the cutter 11 is vertical and the cutting machine body 10 is at the bottom dead center, the shaft 32 overlaps with the sliding rod 51 in the vertical direction. When the cutter 11 is vertical and the cutting machine body 10 is at the top dead center, the motor shaft 23a is preferably tilted relative to the horizontal line within the range of -10° to 0° to 10° (the downward tilt of the opposite side of the gear of the motor shaft 23a relative to the horizontal line (0°) is defined as negative, and the upward tilt is defined as positive). In this embodiment, the motor shaft 23a is parallel to the horizontal line when the cutting machine body 10 is at the top dead center. When the cutting machine body 10 is at the top dead center, the motor shaft 23a is located entirely behind the vertical swing support shaft 10a.

[0087] like Figure 6 As shown, when the cutting machine body 10 is at the bottom dead center, the motor shaft 23a faces rearward and is tilted upward on the opposite side of the gear. Its tilt angle is 40° relative to the horizontal line. When the cutter 11 is vertical and the cutting machine body 10 is at the bottom dead center, the motor shaft 23a tilts relative to the horizontal line in the range of 30° to 60°, more preferably in the range of 35° to 45°. Therefore, the electric motor 23 is also arranged compactly in the vertical direction when the cutting machine body 10 is at the bottom dead center. When the cutting machine body 10 is at the bottom dead center, the motor shaft 23a is entirely located in front of the vertical swing support shaft 10a.

[0088] like Figure 8 , 10 As shown in Figure 14, the motor shaft 23a extends parallel to the side of the cutter 11. When viewed in the extension direction of the cutter 11 and the radial direction of the motor shaft 23a, the angle formed by the motor shaft 23a relative to the side of the cutter 11 is preferably -10° to 0° to 10° (a negative angle is defined as the side of the motor shaft 23a opposite to the gear that is parallel to the cutter (0°) tilting to the left, and a positive angle is defined as tilting to the right). Within this angle range, only the relative shaft angles of the meshing drive-side bevel gear 32e and driven-side bevel gear 35a need to be changed, without requiring significant changes to the design concept such as the addition of additional components.

[0089] like Figure 10 As shown, with the cutter 11 in a vertical position and the cutting machine body 10 at its top dead center, the motor shaft 23a, which serves as the center of the electric motor 23, is located to the right of the cutter 11 and to the left of the sliding rod 51. The motor shaft 23a is preferably positioned at 30-50% of the distance from the first imaginary plane S1 to the second imaginary plane S2, perpendicular to the face of the cutter 11 and pointing to the right, for example, at 43% of that distance. The distance from the first imaginary plane S1 to the motor shaft 23a is, for example, 56.2 mm. When the distance from the first imaginary plane S1 to the second imaginary plane S2 is 132 mm, the motor shaft 23a is positioned at 56.2 mm / 132 mm = 43%.

[0090] like Figure 8 , 10As shown, with the blade 11 in a vertical position, the cutting machine body 10 has a handle 40 located to the right of the blade 11 and in front of the gear housing 33. A ring-shaped operating handle 41 extending in a left-right direction approximately orthogonal to the side of the blade 11 is provided at the front of the handle 40. A switch lever 42 is provided on the inner circumference of the operating handle 41. When the user holds the operating handle 41, they can hook their finger to activate the switch lever 42. When the switch lever 42 is activated, the electric motor 23 starts, causing the blade 11 to rotate. A lock release button 43 is provided in front of the operating handle 41. By pressing the lock release button 43, the operating switch lever 42 can be activated. This prevents the electric motor 23 from accidentally starting.

[0091] like Figure 10 As shown, with the cutter 11 in a vertical position and the cutting machine body 10 at its top dead center, the center 41a of the operating handle 41 in the left-right direction is located between the first imaginary plane S1 and the second imaginary plane S2. The center 41a is preferably positioned at 30% to 70% of the distance from the first imaginary plane S1 to the second imaginary plane S2, perpendicular to the plane of the first imaginary plane S1 to the right, for example, at 70% of this distance. The distance from the first imaginary plane S1 to the center 41a is, for example, 92 mm. When the distance from the first imaginary plane S1 to the second imaginary plane S2 is 132 mm, the center 41a is positioned at 92 mm / 132 mm = 70%.

[0092] like Figure 4 , 5 As shown in Figure 8, the handle portion 40 has a carrying handle 44 behind the operating handle 41. The carrying handle 44 is annular, having a first connecting portion 44a at one end and a second connecting portion 44b at the other end. The first connecting portion 44a is connected to the rear of the operating handle 41, which extends to the right of the fixed cover 12. The second connecting portion 44b is connected to the upper part of the front housing 22. When the cutter is in a vertical position, the carrying handle 44 extends in the front-rear direction along the motor shaft 23a. When the cutting machine body 10 is moved to the lower dead center, the carrying handle 44 extends in a generally horizontal direction. With the cutting machine body 10 locked at the lower dead center by the lower dead center locking pin 19, the user can move the benchtop cutting machine 1 by holding the carrying handle 44.

[0093] like Figure 1 , 4As shown, a turntable fixing mechanism 60 is provided at the lower part of the turntable extension 5. A handle 61 is provided at the front of the turntable extension 5. The handle 61 has a concave-convex shape on its periphery so that it can be easily gripped and rotated by a user. The user can grip the handle 61 to rotate the turntable 4 relative to the base 2 in the horizontal direction. A fixing rod 62 extends in the front-rear direction from the handle 61 toward the rear interior of the turntable extension 5. The fixing rod 62 is supported inside the turntable extension 5 by a threaded engagement. The handle 61 can rotate about the fixing rod 62 as its axis. When the handle 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 rearward, its rear end engages with the base 2, allowing the turntable 4 to be positioned relative to the base 2 at any angle of misalignment. By displacing the fixing rod 62 forward, the positioning of the turntable 4 at any angle of misalignment can be released.

[0094] like Figure 4 , 5 As shown, a forced interlocking mechanism 63 is provided at the lower part of the turntable extension 5. Using the forced interlocking mechanism 63, the turntable 4 can be positioned at a predetermined angle corresponding to the positioning recess 7b of the dial scale plate 7. A locking release lever 64 and a positioning pin 64a are provided on the forced interlocking mechanism 63. The locking release lever 64 is located below and behind the grip portion 61 at the front of the turntable extension 5. The positioning pin 64a extends in the longitudinal direction along the length of the turntable extension 5 at the lower part of the turntable extension 5. The positioning pin 64a is set at approximately the same height as the dial scale plate 7. The rear end of the positioning pin 64a can enter the positioning recess 7b by moving rearward. Furthermore, the rear end of the positioning pin 64a can disengage from the positioning recess 7b by moving forward.

[0095] Figure 4 , 5 The front part of the positioning pin 64a is connected to the locking release lever 64. When the locking release lever 64 is pressed downward, the positioning pin 64a moves forward. After moving forward, the rear end of the positioning pin 64a is released from engagement with the positioning recess 7b. Therefore, when the positioning of the turntable 4 is released by operating the grip 61, the turntable 4 can rotate freely in the left and right directions. When the locking release lever 64 is lifted upward, the positioning pin 64a moves backward. The rear end of the positioning pin 64a abuts against the outer periphery of the dial scale plate 7. When the grip 61 is held and the turntable 4 is rotated in the horizontal direction, the positioning pin 64a enters any of the positioning recesses 7b provided on the outer periphery of the dial scale plate 7. In this way, the turntable 4 is positioned at a predetermined angle corresponding to the positioning recess 7b.

[0096] like Figure 4 , 5As shown, a tilting fixing mechanism 65 is provided at the front of the turntable extension 5 to hold the main support arm 50 in a position that allows it to tilt in the left and right directions. The tilting fixing mechanism 65 has a tilting fixing operation part 66 and a transmission shaft 66a (see reference). Figure 13 A tilt-locking operation section 66 is provided between the handle section 61 and the front end of the turntable extension 5. The tilt-locking operation section 66 is rotatable about an axis coaxial with the handle section 61. The tilt-locking operation section 66 has a raised / lowered pattern on its periphery that differs from the raised / lowered pattern of the handle section 61, designed for easy rotation by the user. Therefore, the user can easily distinguish between the tilt-locking operation section 66 and the handle section 61 when holding the handle, thus preventing accidental operation.

[0097] like Figure 4 , 5 As shown, when the tilting and fixing operating part 66 is rotated, the transmission shaft 66a (refer to...) Figure 13 The transmission shaft 66a extends along the length of the turntable extension 5 in the front-rear direction to the lower part of the main support arm 50. A bearing portion 67 is provided at the lower part of the main support arm 50, which is capable of extending along an elongated hole 67a (see reference) in an arc shape centered on the left-right tilting support shaft 50a. Figure 13 Movement. The bearing portion 67 is threadedly fastened to the rear end of the transmission shaft 66a. The bearing portion 67 is restricted from rotating about the axis of the transmission shaft 66a by the side of the elongated hole 67a. Therefore, when the tilting fixing operation portion 66 is rotated in the tightening direction, an axial force is generated between the main body support arm 50 and the arm support portion 4b by the transmission shaft 66a. Therefore, the main body support arm 50 and the arm support portion 4b are pressed in the forward and backward direction, and the main body support arm 50 is fixed at any left and right tilt angle relative to the arm support portion 4b. When the tilting fixing operation portion 66 is rotated in the loosening direction, the axial force of the transmission shaft 66a is eliminated. Therefore, the main body support arm 50 can tilt in the left and right direction about the center of the left and right tilting support shaft 50a.

[0098] As mentioned above, such as Figure 4 , 10As shown, the benchtop cutting machine 1 has a sliding rod 51, which is elongated and extends in the front-to-back direction. The benchtop cutting machine 1 has a sliding base 52, which is mounted on the sliding rod 51 and slides along the sliding rod 51 in the front-to-back direction. The benchtop cutting machine 1 has a cutting machine body 10, which is mounted to be able to swing in the vertical direction about a vertical swing support shaft 10a provided on the sliding base 52. The cutting machine body 10 has an output shaft 37, which extends along an axis orthogonal to the sliding rod 51 and is used to mount the cutting tool 11. The cutting machine body 10 has an electric motor 23, which is the power source for driving the output shaft 37. When viewed from the front with the cutting tool 11 in a vertical position, the electric motor 23 is positioned between the cutting tool 11 and the sliding rod 51 and above the sliding rod 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. Viewed from the front, the power transmission unit 30 is located between the cutter 11 and the sliding rod 51 and is located above the sliding rod 51 when the cutting machine body 10 is at the top dead center.

[0099] 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 sliding rod 51 regardless of the position of the cutting machine body 10 from the top dead center to the bottom dead center. This allows the cutting tool 11 to be positioned close to the sliding rod 51. Consequently, when the cutting machine body 10 is at the top dead center, both the electric motor 23 and the power transmission unit 30 are also positioned above the sliding rod 51. Therefore, when the cutting machine body 10 is at the top dead center, the visual confirmation of the cutting position of the cutting tool 11 is good.

[0100] like Figure 7 , 14 As shown, the power transmission unit 30 has a shaft 32 that transmits driving force from the motor shaft 23a to the output shaft 37. When viewed axially at the bottom dead center of the cutting machine body 10, the shaft 32 intersects with the sliding rod 51. Therefore, when viewed from the front at the bottom dead center of the cutting machine body 10, the shaft 32 is positioned between the cutter 11 and the sliding rod 51. The electric motor 23 avoids the area above the shaft 32 and above the sliding rod 51. Therefore, the axial distance between the cutter 11 and the sliding rod 51 on the output shaft 37 can be shortened. This allows for higher maintenance of the mechanical rigidity of the cutting machine body 10, thereby suppressing a decrease in the cutting accuracy of the cutter 11.

[0101] like Figure 14As shown, the diameter 32c of the shaft 32 is 1 / 40 to 1 / 20 of the diameter 11a of the tool 11. Therefore, the shaft 32 can be set with the strength required to support the electric motor 23 and the axial distance between the tool 11 and the sliding rod 51 on the output shaft 37 can be shortened.

[0102] like Figure 4 , 14 As shown, a cylindrical shaft housing 31 is provided to house the shaft 32. The shaft housing 31 has a gear housing connection portion 31b that extends radially around the driven end of the shaft 32, which is connected to the output shaft 37. Therefore, the shaft housing 31 can be threadedly fastened axially to the gear housing 33 on the output shaft 37 side. This results in good assemblability and improved support rigidity of the shaft housing 31.

[0103] like Figure 10 As shown, the axial distance of the output shaft 37 from the cutter 11 to the sliding rod 51 is less than 3 / 4 of the diameter 11a of the cutter 11. Therefore, the axial distance of the output shaft 37 from the cutter 11 to the sliding rod 51 can be made to the required minimum, thereby improving the mechanical rigidity of the cutting machine body 10 supported by the sliding rod 51. Therefore, when the cutter 11 cuts into the workpiece, the axial deviation of the cutter 11 on the output shaft 37 can be suppressed.

[0104] like Figures 5-7 As shown, when the cutting machine body 10 is at the bottom dead center, the electric motor 23 is positioned between the output shaft 37 and the vertical swing support shaft 10a in the front-to-back direction. Therefore, the center of gravity of the cutting machine body 10 at the bottom dead center can be brought closer to the vertical swing support shaft 10a. This reduces the variable load on the cutting machine body 10 during vertical swing. The cutting machine body 10 is subjected to force from the bottom dead center to the top dead center via torsion springs mounted around the vertical swing support shaft 10a. By reducing the variable load on the cutting machine body 10, the spring load of the torsion springs can be reduced. Furthermore, the mechanical rigidity of the cutting machine body 10 centered on the vertical swing support shaft 10a can be improved.

[0105] like Figure 4 As shown, when the cutting machine body 10 is at the top dead center, the electric motor 23 is positioned entirely behind the vertical swing support shaft 10a. Therefore, the load of the electric motor 23 can be used to swing the cutting machine body 10 upwards and return it to the top dead center. Thus, the spring load of the torsion spring that exerts a force on the cutting machine body 10 at the top dead center can be reduced.

[0106] like Figure 10 , 14As shown, when the cutter 11 is in a vertical position and viewed radially from the motor shaft 23a, the motor shaft 23a is parallel to the side of the cutter 11 or inclined at less than 10° relative to the side. Therefore, the motor shaft 23a can be arranged in a position along the side of the cutter 11. Therefore, the electric motor 23 can be arranged close to the cutter 11 in the axial direction of the output shaft 37. As a result, the cutting machine body 10 can be made compact in the axial direction of the output shaft 37.

[0107] like Figure 10 As shown, the motor shaft 23a, which serves as the center of the electric motor 23, is positioned at a distance of 30% to 50% of the distance from the cutter 11 to the sliding rod 51 in the direction perpendicular to the face of the cutter 11, with the cutter 11 as the starting point. Therefore, the motor shaft 23a is positioned closer to the cutter 11 than the sliding rod 51. This allows the center of gravity of the cutting machine body 10 to be closer to the cutter 11 in the axial direction of the output shaft 37. Consequently, the reaction force exerted by the cutter 11 on the workpiece and the torque generated by the weight of the cutting machine body 10 when the cutting machine body 10 is moved downwards and the cutter 11 cuts into the workpiece can be reduced.

[0108] like Figure 10 , 14 As shown, the electric motor 23 is a brushed motor driven by AC power. Therefore, with a brushed motor having a relatively large outer diameter, visual confirmation of the cutting position of the tool 11 can be prevented from being obstructed by the brushed motor. In addition, with a brushed motor, the axial distance between the tool 11 and the sliding rod 51 on the output shaft 37 can be shortened.

[0109] like Figure 4 As shown, the sliding rod 51 has multiple rods arranged in a row. These rods include a first rod 51a at the top and a second rod 51b at the bottom. When the diameter 51e of the first rod 51a is set to a [mm], the diameter 51f of the second rod 51b is set to b [mm], the center distance 51g between the first rod 51a and the second rod 51b is set to c [mm], and the diameter 11a of the cutter 11 is set to d [mm], the relationship (a / 2 + b / 2 + c) × 2 < d < (a / 2 + b / 2 + c) × 3.5 is satisfied. Therefore, the multiple rods can be compactly housed in the vertical direction within a length shorter than half the diameter 11a of the cutter 11. Furthermore, the vertical distance encompassing all the rods is greater than 2 / 7 times the diameter 11a of the cutter 11. Therefore, the multiple rods can be arranged in a manner that provides sufficient strength to support the cutting machine body 10. This balances the compactness of the sliding structure of the cutting machine body 10 with its supporting strength.

[0110] like Figures 5-7As shown, the motor shaft 23a is oriented with an angle that is tilted backward and upward when the cutting machine body 10 is at the 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 the bottom dead center. As a result, the benchtop cutting machine 1 can be made compact in the vertical direction.

[0111] like Figures 5-7 As shown, when the main body 10 of the cutting machine is at its lower dead center, the tilt angle of the motor shaft 23a relative to the horizontal line is 30° to 60°. Therefore, it is possible to prevent the motor housing 20, which houses the electric motor 23, from coming into contact with the workpiece being cut. Thus, the workpiece can be properly cut using the compactly arranged benchtop cutting machine 1.

[0112] like Figure 4 As shown, when the cutting machine body 10 is at its top dead center, the motor shaft 23a is parallel to the horizontal line or has an inclination angle of less than 10° relative to the horizontal line. Therefore, the amount of upward or downward protrusion of the electric motor 23 can be suppressed. Thus, visual confirmation of the cutting position of the tool 11 can be prevented from being obstructed.

[0113] like Figure 8 , 10 As shown, the benchtop cutter 1 has an operating handle 41 used when moving the cutter body 10 relative to the sliding rod 51. Viewed from the front with the cutter 11 in a vertical position, the center 41a of the operating handle 41 is located on an imaginary plane containing the cutter 11 or between the sliding rod 51 and the cutter 11. Therefore, the center 41a of the sliding rod 51 and the operating handle 41 can be brought closer together in the axial direction of the output shaft 37. This reduces the torque on the cutter body 10 relative to the sliding rod 51 when the user holds the operating handle 41 and the cutter 11 cuts into the workpiece. Furthermore, the center 41a of the cutter 11 and the operating handle 41 can be brought closer together in the axial direction of the output shaft 37. This reduces the torque generated by the reaction force of the cutter 11 from the workpiece and the operating force applied to the operating handle 41 when the user holds the operating handle 41 and the cutter 11 cuts into the workpiece.

[0114] like Figure 10 As shown, the center 41a of the operating handle 41 is positioned at 30-70% of the axial distance from the cutter 11 to the sliding rod 51. Therefore, the center 41a of the operating handle 41 is positioned at a distance not too far from either the cutter 11 or the sliding rod 51. This reduces the torque acting on the cutting machine body 10 between the cutter 11 and the operating handle 41. Furthermore, it suppresses deflection of the sliding rod 51 caused by the operating force applied to the operating handle 41.

[0115] like Figure 13As shown, the benchtop cutting machine 1 has a lower stop stop 17 that restricts the movement of the cutting machine body 10 below the lower stop point. Viewed from the front with the cutter 11 in a vertical position, the center 17a of the lower stop stop 17 is located between the sliding rod 51 and the cutter 11. Therefore, the distance between the center 17a of the lower stop stop 17 and the sliding rod 51 in the axial direction of the output shaft 37 can be shortened. The lower stop stop 17 is subjected to a reaction force when the cutting machine body 10 descends to the lower stop point. Therefore, by shortening the distance, the torque of the cutting machine body 10 relative to the sliding rod 51 generated by the reaction force can be reduced.

[0116] like Figure 13 As shown, the center 17a of the lower stop stop 17 is positioned at 30-70% of the axial distance from the cutter 11 to the sliding rod 51. Therefore, the center 17a of the lower stop stop 17 is positioned at a distance not too far from either the cutter 11 or the sliding rod 51. This reduces the torque on the cutting machine body 10 between the reaction force acting on the lower stop stop 17 and the sliding rod 51, and suppresses the deviation of the cutter 11 caused by the torque.

[0117] Next, according to Figures 16-21 To illustrate the second embodiment of the present invention, a benchtop cutting machine 70 is used instead. Figure 1 The tabletop cutting machine 1 shown has a cutting machine body 71 in its cutting machine body 10. The cutting machine body 71 is supported by a sliding base 52 and is able to swing vertically relative to the sliding base 52 about a vertical swing support shaft 71a located behind the cutter 11. The cutting machine body 10 is provided with a motor housing 73 that houses an electric motor 74 and a battery mounting part 78 that can mount a rechargeable battery 79.

[0118] like Figure 16 , 20 As shown, the motor housing 73 is positioned between the cutter 11 and the sliding rod 51 in the left-right direction. The motor housing 73 is generally cylindrical in shape, extending in the front-back direction. The electric motor 74 is a type of motor called a DC brushless motor, driven by power supplied from a DC power source such as a battery 79. A motor shaft 74a is positioned at the center of the electric motor 74. The motor shaft 74a extends in the front-back direction along a motor axis J parallel to the side of the cutter 11. The position and extension direction of the motor axis J between the cutter 11 and the sliding rod 51 in the left-right direction are as follows: Figure 10 The motor axis J shown is approximately the same.

[0119] like Figure 21As shown, the motor shaft 74a is supported by a first bearing 74g and a second bearing 74h, enabling it to rotate about the motor axis J. The inner ring of the first bearing 74g is pressed into the rear end of the motor shaft 74a, and the outer ring of the first bearing 74g is pressed into a hole located at the inner rear end of the motor housing 73. The inner ring of the second bearing 74h is pressed into the front part of the motor shaft 74a, and the outer ring of the second bearing 74h is pressed into a hole 81c located at the rear end of the gear housing 81 (described later). The second bearing 74h is prevented from falling out of the hole 81c by a washer 74i.

[0120] like Figure 21 As shown, the stator 74c of the electric motor 74 is supported on the inner circumferential surface of the motor housing 73 in a non-rotatable manner. The rotor 74b of the electric motor 74 is disposed 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 capable of rotating with the motor shaft 74a. A sensor substrate 74d for detecting the rotation angle of the rotor 74b is provided behind the rotor 74b. At the front of the motor shaft 74a and between the rotor 74b and the second bearing 74h in the front-rear direction, a fan 75 for introducing cooling air into the motor housing 73 is integrally mounted. When the electric motor 74 is driven to rotate the fan 75, cooling air flows from the rear of the motor housing 73 forward.

[0121] like Figure 20 As shown, the cutting machine body 71 has a power transmission section 80 located in the left-right direction between the cutter 11 and the sliding rod 51, which transmits the driving force of the motor shaft 74a to the output shaft 37. The power transmission section 80 is housed in a gear housing 81 and a gear receiving section 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 with the opening at the right end of the gear receiving section 12a.

[0122] like Figure 21 As shown, the gear housing 81 is configured to be internally connected by a motor housing connecting portion 81a that opens rearward at the rear end and a fixing cover connecting portion 81b that opens leftward at the left side. The front end 73a of the motor housing 73 and the rear end motor housing connecting portion 81a of the gear housing 81 are connected by a plurality of fixing screws 81e extending along the motor axis J (see reference). Figure 17 The drive-side bevel gear 74e is integrally mounted on the front end of the motor shaft 74a. A nut 74f for preventing disengagement is mounted in front of the drive-side bevel gear 74e. The drive-side bevel gear 74e enters the gear housing 81.

[0123] like Figure 21As shown, the fixed cover connecting portion 81b is connected in a sleeve manner covering the outer periphery of the gear housing connecting portion 12d. The fixed cover connecting portion 81b and the gear housing connecting portion 12d are connected by a plurality of fixing screws 81f extending in a direction substantially orthogonal to the side surface of the cutter 11. The first intermediate shaft 35, the second intermediate shaft 36, and the output shaft 37 are supported on the gear housing 81 and the gear receiving portion 12a in a manner that allows them to rotate about an axis extending in the left-right direction. The bearing housing 34 is connected to the left side of the gear housing 81 by a plurality of fixing screws 34d extending in a direction substantially orthogonal to the side surface of the cutter 11.

[0124] like Figure 21 As shown, a hole 81d is provided on the right side inside the gear housing 81. The outer ring of the fifth bearing 35c, which is pressed into the right end of the first intermediate shaft 35, is pressed into the hole 81d. The driven bevel gear 35a, mounted on the right side of the first intermediate shaft 35, meshes with the drive bevel gear 74e of the motor shaft 74a. By positioning the second bearing 74h and the fifth bearing 35c both within the holes 81c and 81d provided in the gear housing 81, high positional accuracy of the motor shaft 74a and the first intermediate shaft 35 can be achieved. Furthermore, high meshing accuracy between the drive bevel gear 74e and the driven bevel gear 35a can be achieved.

[0125] like Figure 17 , 18 As shown, with the cutter 11 in a vertical position and the cutting machine body 71 at the top dead center, the electric motor 74 and the power transmission unit 80 are located above the first rod 51a. The motor shaft 74a is parallel to the horizontal line when the cutting machine body 71 is at the top dead center. When the cutting machine body 71 is at the top dead center, the motor shaft 74a is located in front of the vertical swing support shaft 71a.

[0126] like Figure 19 , 20 As shown, with the cutter 11 in a vertical position and the cutting machine body 71 at the bottom dead center, the electric motor 74 and the power transmission unit 80 overlap with the sliding rod 51 in the vertical direction. When the cutting machine body 71 is at the bottom dead center, the motor shaft 74a faces rearward and tilts upward on the opposite side of the gear. Its tilt angle relative to the horizontal line is in the range of 30 to 60°, more preferably in the range of 35 to 45°, for example, 40°. The motor shaft 74a is also located in front of the vertical swing support shaft 71a when the cutting machine body 71 is at the bottom dead center.

[0127] like Figure 17 , 21As shown, a rectangular box-shaped controller housing 76 is connected to the rear of the motor housing 73. A second connecting portion 44b of a carrying handle 44 is connected to the upper part of the controller housing 76. A controller 77 for controlling the drive of the electric motor 74 is housed within the controller housing 76. The controller 77 has a shallow, generally rectangular housing and a control substrate molded from resin and housed within the housing. The controller 77 is housed within the controller housing 76 in a forward-backward direction along the motor axis J, in the thickness direction (the direction in which the shortest side of the housing extends). The controller 77 houses a control circuit, a drive circuit, an automatic stop circuit, and other components primarily used for controlling the operation of the electric motor 74. The control circuit includes a microcomputer that sends control signals to the electric motor 74 based on the position information of the rotor 74b obtained from the sensor substrate 74d. The drive circuit includes a FET that switches the current of the electric motor 74 according to the control signals received from the control circuit. The automatic stop circuit cuts off the power supply to the electric motor 74 in response to the detection result of the state of the battery 79 to prevent over-discharge or overcurrent.

[0128] like Figure 17 , 21 As shown, a battery mounting section 78 is provided at the rear of the controller housing 76. The mounting surface of the battery mounting section 78 extends rearward and substantially perpendicular to the motor axis J when the cutting machine body 71 is at its top dead center. A generally rectangular box-shaped battery 79 is mounted in the battery mounting section 78 by sliding from top to bottom. Alternatively, the battery 79 can be removed from the battery mounting section 78 by sliding it from bottom to top. The battery 79 is, for example, a 36V lithium-ion battery. The battery 79 can be repeatedly charged using a separately provided charger after being removed from the battery mounting section 78. The battery 79 can be used as a power source interchangeably with other rechargeable power tools such as screw fasteners and electric drills.

[0129] As mentioned above, such as Figure 4 , 20As shown, the benchtop cutting machine 70 has a sliding rod 51, which is elongated and extends in the front-to-back direction. The benchtop cutting machine 70 has a sliding base 52, which is mounted on the sliding rod 51 and slides along the sliding rod 51 in the front-to-back direction. The benchtop cutting machine 70 has a cutting machine body 71, which is mounted to be able to swing vertically about a vertical swing support shaft 71a provided on the sliding base 52. The cutting machine body 71 has an output shaft 37, which extends along an axis orthogonal to the sliding rod 51 and is used to mount the cutting tool 11. The cutting machine body 71 has an electric motor 74, which is the power source for driving the output shaft 37. Viewed from the front with the cutting tool 11 in a vertical position, the electric motor 74 is positioned between the cutting tool 11 and the sliding rod 51 and above the sliding rod 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. Viewed from the front, the power transmission unit 80 is positioned between the cutter 11 and the sliding rod 51, and is located above the sliding rod 51 when the cutting machine body 71 is at its top dead center. Therefore, the benchtop cutting machine 70 can... Figure 4 , 10 The tabletop cutting machine 1 shown achieves the same effect. That is, the cutter 11 can be positioned close to the sliding rod 51. Moreover, with the cutting machine body 71 at the top dead center, the visual confirmation of the cutting position of the cutter 11 is good.

[0130] Various modifications can be made to the benchtop cutting machines 1 and 70 of the embodiment described above. The cutting machine bodies 10 and 71 are supported by a sliding rod 51 mounted on the main body support arm 50 so that they can move in the front-to-back direction. The main body support arm 50 is supported by the arm support portion 4b of the turntable 4 so that it can tilt relative to the arm support portion 4b of the turntable 4. Alternatively, the main body support arm 50 can also be configured to be directly supported by the base 2 and the mounting surface. It is also possible to apply benchtop cutting machines that do not have a left-right tilt angle adjustment mechanism that allows the cutting machine bodies 10 and 71 to tilt in the left-right direction or a slant angle adjustment mechanism that allows the turntable 4 to rotate in the horizontal direction relative to the base 2.

[0131] The left-right configuration of the cutting machine bodies 10 and 71 can also be the opposite of that of the present invention. That is, it can also be a structure in which the cutting tool 11 is arranged on the right side and the sliding rod 51 is arranged on the left side, and the electric motor 23 and 74, the handle 40, the lower stop stop 17, etc. are arranged between the cutting tool 11 and the sliding rod 51 in the left-right direction.

[0132] An example is provided of a sliding rod 51 comprising two rods 51a and 51b, but there may be one rod or more than three arranged in a row. The sliding rod 51 may not be parallel to the side of the cutter 11. The sliding rod 51 may not be parallel to the horizontal line. An example is provided of electric motors 23 and 74 with their motor axis J parallel to the horizontal line when the cutting machine bodies 10 and 71 are at their top dead center. Alternatively, a structure may be provided where, when the cutting machine bodies 10 and 71 are at their top dead center, the motor axis J extends upwards or downwards toward the opposite side (rear) of the gear.

[0133] Example of a power transmission unit 30, 80 that transmits power to the output shaft 37 via a two-stage reduction gear 35b of the first intermediate shaft 35 and a reduction gear 36a of the second intermediate shaft 36. Alternatively, for example, only one intermediate shaft or more than three intermediate shafts may be provided. Example of an operating handle 41 that is annular in the left-right direction. Alternatively, the operating handle 41 may be configured as annular in the front-back direction, for example, parallel to the motor axis J. Example of a structure in which the upper dead center stop 18 is provided to the left of the fixed cover 12. Alternatively, like the lower dead center stop 17, the upper dead center stop 18 may be provided in the left-right direction between the cutter 11 and the sliding rod 51.

Claims

1. A bench cutting machine characterized by comprising a slide bar, a slide base, and a cutting machine main body, wherein the slide bar is elongated and extends in a front-rear direction; the slide base is mounted to the slide bar and slides in the front-rear direction along the slide bar; the cutting machine main body is mounted to be swingable in a vertical direction about a vertical swing support shaft provided to the slide base; the cutting machine main body has an output shaft, an electric motor, and a power transmission portion, wherein the output shaft extends in an axis orthogonal to the slide bar and is used to mount a tool; the electric motor is a power source that drives the output shaft, wherein, when the tool is vertical, the rotor of the electric motor is provided as a whole between the tool and the slide bar and is located above the slide bar when the cutting machine main body is at a top dead center; the power transmission portion transmits driving force of a motor shaft of the electric motor to the output shaft; when the tool is vertical, the power transmission portion is provided as a whole between the tool and the slide bar and is located above the slide bar when the cutting machine main body is at the top dead center; the power transmission portion has a shaft that transmits driving force from the motor shaft to the output shaft; the shaft (i) does not cross the slide bar when the cutting machine main body is at a bottom dead center and the shaft is at a front end, as viewed from the shaft; and (ii) crosses the slide bar when the cutting machine main body is at the bottom dead center and the shaft is at a rear end, as viewed from the shaft.

2. The bench cutting machine according to claim 1, characterized in that a diameter of the shaft is 1 / 40 to 1 / 20 of a diameter of the tool.

3. The bench cutting machine according to claim 1 or 2, characterized by comprising a cylindrical shaft housing that houses the shaft, wherein the shaft housing has a diameter expansion portion that expands in a radial direction of the shaft around a driven side end of the shaft that is connected to the output shaft.

4. The bench cutting machine according to claim 1 or 2, characterized in that a distance in the shaft direction from the tool to the slide bar is 3 / 4 or less of the diameter of the tool.

5. The bench cutting machine according to claim 1 or 2, characterized in that, when the cutting machine main body is at the bottom dead center, the electric motor is located as a whole between the output shaft and the vertical swing support shaft in the front-rear direction.

6. The bench cutting machine according to claim 1 or 2, characterized in that, when the cutting machine main body is at a top dead center, the electric motor is located as a whole rearward of the vertical swing support shaft.

7. The bench cutting machine according to claim 1 or 2, characterized in that, when the tool is vertical, the motor shaft is parallel to a side surface of the tool or is inclined with respect to the side surface by 10° or less, as viewed in a radial direction of the motor shaft.

8. The bench cutting machine according to claim 1 or 2, characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The center of the electric motor is arranged at a position of 30 to 50% of the distance from the tool to the slide bar in the direction perpendicular to the face of the tool.

9. The table cutter according to claim 1 or 2, wherein The electric motor is a brush motor driven by power supplied from an AC power source.

10. The table cutter according to claim 1 or 2, wherein The slide bar has a plurality of rods arranged therein, the plurality of rods including a first rod located at the uppermost position and a second rod located at the lowermost position, When the diameter of the first rod is a [mm], the diameter of the second rod is b [mm], the center distance between the first rod and the second rod is c [mm], and the diameter of the tool is d [mm], the relationship (a / 2 + b / 2 + c) x 2 < d < (a / 2 + b / 2 + c) x 3.5 is satisfied.

11. The table cutter according to claim 1 or 2, wherein The motor shaft is oriented at an inclination angle inclined toward the rear and upward when the cutter body is at the lower dead center.

12. The table cutter according to claim 11, wherein The inclination angle of the motor shaft is 30° to 60° with respect to the horizontal line.

13. The table cutter according to claim 12, wherein The motor shaft is parallel to the horizontal line or has the inclination angle of 10° or less with respect to the horizontal line when the cutter body is at the upper dead center.

14. The table cutter according to claim 1 or 2, wherein an operation handle used when the cutter body is moved with respect to the slide bar is provided, in a state where the tool is vertical, the center of the operation handle is located on an imaginary plane including the tool or between the slide bar and the tool as viewed from the front.

15. The table cutter according to claim 14, wherein the center of the operation handle is arranged at a position of 30 to 70% of the distance from the tool to the slide bar in the axial direction with the tool as a starting point.

16. The table cutter according to claim 1 or 2, wherein a lower dead center stopper that restricts the movement of the cutter body downward of the lower dead center is provided, in a state where the tool is vertical, the center of the lower dead center stopper is located between the slide bar and the tool as viewed from the front.

17. The table cutter according to claim 16, wherein the center of the lower dead center stopper is arranged at a position of 30 to 70% of the distance from the tool to the slide bar in the axial direction with the tool as a starting point.

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