CN112404549B

CN112404549B - Table type cutting machine

Info

Publication number: CN112404549B
Application number: CN202010635353.4A
Authority: CN
Inventors: 铃木幸则; 可儿利之; 三轮祐己
Original assignee: Makita Corp
Current assignee: Makita Corp
Priority date: 2019-08-23
Filing date: 2020-07-03
Publication date: 2023-08-25
Anticipated expiration: 2040-07-03
Also published as: JP7419112B2; JP2021035758A; CN112404549A

Abstract

The invention provides a bench cutting machine. The bench cutter can perform chamfering and has a tilt fixing operation part with good operability. The bench cutter (1) has a turntable fixing mechanism (40) and a tilt fixing mechanism (60) capable of fixing the tilt of the cutter body in the left-right direction. The turntable fixing mechanism (40) includes: a grip part (41) capable of rotating; and a fixing lever (42) which can fix the turntable (4) to the base (2) by a rotational operation of the grip portion. The grip part is located forward of the front surface of the table extension part (5) and below the upper surface of the turntable, and is arranged at the center of the table extension part in the lateral direction. The tilt fixing mechanism has a tilt fixing operation unit (61) capable of being rotationally operated. The tilt fixing operation portion is located forward of the front surface of the table extension portion and is provided rearward of the grip portion. The rotation axis of the tilting fixing operation part is arranged coaxially with the rotation axis of the holding part.

Description

Table type cutting machine

Technical Field

The present invention relates to a bench cutter which is used in cutting processing of, for example, wood and is capable of chamfering.

Background

The bench cutter has: a base mounted on a table or the like; a turntable supported on the base so as to be horizontally rotatable; and a cutter body supported above the turntable. The cutter rotatably supported by the cutter body is made to cut into the workpiece mounted on the turntable, thereby cutting the workpiece. Provided is a cutter body which is provided on a turntable so as to be tiltable in the left-right direction and which can be subjected to so-called chamfering. In this case, the bench cutter is provided with a tilt fixing operation unit. As described in patent documents 1 to 3, the tilting fixing operation unit tilts the cutter body in the left-right direction by a predetermined tilt angle, and can fix the posture of the cutter body at the tilt angle. Accordingly, for example, the cutter body is tilted by 45 ° to the right, and the cutter is made to cut into the workpiece.

In the related art, for example, as described in patent document 1, a tilting fixing operation portion is provided on a rear surface side (rear side) of a main body tilting portion that supports a cutter main body in a tiltable manner. The main body tilting part is disposed at a position behind the turntable. That is, the tilt fixing operation unit described in patent document 1 is provided at a position away from a user located in front of the bench cutter. Therefore, the user needs to extend his or her hand to a position rearward of the main body tilting portion or to a position rearward of the main body tilting portion, and it may be difficult to operate the tilting fixing operation portion.

The bench cutter described in patent document 2 has a tilt fixing operation portion in front of a slide bar extending forward from a main body tilt portion. The operating force of the tilt fixing operation portion is transmitted to a screw connecting the main body tilt portion and the turntable, for example, through a plurality of gears. Alternatively, the operating force of the tilting fixing operating portion is transmitted to a screw that connects the tilting portion of the main body and the turntable, for example, via the driving pulley, the driven pulley, and the belt that spans therebetween. Therefore, the tilt fixing operation mechanism has a complicated structure and a large number of parts, and there is room for improvement.

The bench cutter described in patent document 3 has a tilt fixing operation portion on a table extension portion extending forward from a turntable. The tilt fixing operation portion is provided in front of a turntable fixing operation portion capable of fixing the turntable at a fixed angle (miter angle) in the horizontal direction. The turntable-fixing operation section also functions as a grip section when the turntable is rotated in the left-right direction. However, the tilt fixing operation portion and the turntable fixing operation portion are provided at positions offset from the center in the lateral direction of the table extension portion. That is, the cutting surface of the cutter and the turret fixing operation portion are offset from each other in the left-right direction. Thus, when adjusting the miter angle of a turntable, for example, it is sometimes difficult to align the blade face of the cutting tool with the ink lines carried by the piece being cut. Further, when the turntable is rotated by gripping the turntable fixing operation unit, it is difficult to operate the turntable without gripping the tilt fixing operation unit located on the near front side. When the tilt fixing operation portion is gripped together with the turntable fixing operation portion, there is a possibility that the tilt fixing operation portion may be erroneously operated. In addition, it is necessary to provide the operation knob of the tilt fixing operation unit to be thinner than the operation knob of the turntable fixing operation unit, and it may be difficult to transmit the operation force of the tilt fixing operation unit to the rear main body tilt unit.

[ Prior Art literature ]

[ patent literature ]

Patent document 1: japanese patent laid-open publication No. 2009-226529

Patent document 2: japanese patent laid-open publication No. 2015-150633

Patent document 3: japanese patent laid-open publication No. H11-48029

Disclosure of Invention

[ problem to be solved by the invention ]

The invention provides a bench cutting machine capable of chamfering, which is provided with a tilting fixed operation part with good operability.

[ solution for solving the problems ]

In accordance with one feature of the present invention, a bench cutter has a base, a turntable, a cutter body, and a turntable securing mechanism. The turntable is supported on the base so as to be horizontally rotatable. The cutter body is provided above the turntable and rotatably supports the cutter. The turntable fixing mechanism can fix the turntable to the base. The bench cutter has a main body tilting part and a tilting fixing mechanism. The main body tilting part is provided at the rear of the turntable, and supports the cutter main body so as to be tiltable in the left-right direction. The tilting fixing mechanism can fix tilting of the cutter body in the left-right direction. The turntable fixing mechanism has: a turntable fixing operation section capable of being rotationally operated; and a turntable fixing part. The turntable fixing member is configured to be capable of fixing the turntable to the base by rotating the turntable fixing operation section. The turntable fixing operation section is located forward of the front surface of the turntable and downward of the upper surface of the turntable, and is disposed at the center in the lateral direction of the turntable. The tilt fixing mechanism has a tilt fixing operation unit capable of being rotationally operated. The rotation shaft of the tilting fixing operation part is coaxially arranged with the rotation shaft of the turntable fixing operation part. The tilt fixing operation portion is located forward of the front surface of the turntable, and is provided rearward of the turntable fixing operation portion.

Therefore, the turntable fixing operation part and the tilting fixing operation part are positioned in front of the table-type cutting machine, so that operation by a user who works is facilitated. That is, the operability of the tilt fixing operation portion can be improved while maintaining the high operability of the turntable fixing operation portion. Further, the turntable-fixing operation section having a higher operation frequency is provided in front of the tilt-fixing operation section, and is closer to a user located in front of the bench cutter. Therefore, erroneous operation of the tilt fixing operation portion to the turntable fixing operation portion can be suppressed. The turntable-fixing operation section also functions as an operation section to be gripped by a user when horizontally rotating the turntable. In this case, since the turntable-fixing operation portion is located at a position farther from the rotation center of the turntable, it is easy to rotate the turntable by holding the turntable-fixing operation portion.

According to another feature of the present invention, the tilt fixing mechanism has a tilt fixing transmission shaft extending from a front portion of the turntable in a front-rear direction to the main body tilt portion. The tilt fixing transmission shaft is provided between the rotation center and the left end portion of the turntable or between the rotation center and the right end portion of the turntable.

Therefore, the tilt fixing transmission shaft can be provided in the space left free in the lower part of the turntable while avoiding the rotation shaft of the turntable. Therefore, the axial force or the rotational force transmitted to the tilt fixing transmission shaft is not easily hindered, and the operation force of the tilt fixing operation portion is easily transmitted to the main body tilt portion.

In accordance with another feature of the invention, the bench cutter has a positive locking mechanism for positioning the turntable at a prescribed angle of rotation. The tilting fixed transmission shaft is arranged left and right relative to the turntable fixing part. The positive locking mechanism is located below the turntable fixing member.

Therefore, the turntable fixing mechanism and the tilt fixing mechanism can be compactly arranged in the up-down direction. In addition, the forward locking mechanism can be disposed below the turntable fixing member that is free from the vertical compactness. Accordingly, the turntable fixing mechanism, the tilt fixing mechanism, and the forward locking mechanism can be disposed in a minimum space below the table surface of the turntable in a state where operability is maintained.

According to another feature of the invention, the tilt fixing mechanism has a rotary lever. The rotating lever is rotatable in the front-rear direction, one side of the rotating lever is capable of abutting against the tilt fixing operation portion, and the other side of the rotating lever is connected to the tilt fixing transmission shaft. The tilt fixing operation portion has a threaded shaft portion that displaces the tilt fixing operation portion subjected to the rotation operation in the front-rear direction. The tilt fixing operation portion is displaced rearward by the threaded shaft portion, whereby a rotary lever in contact with the tilt fixing operation portion is rotated to generate a forward pulling force on the tilt fixing transmission shaft. By this tension, the main body tilting portion is pressed and fixed to the turntable.

Therefore, the tilt fixing mechanism can be made simple in structure. Accordingly, the tilt fixing mechanism can be compactly provided. In addition, the tilt fixing mechanism is easy to maintain or can be maintenance-free, so that the operability of the tilt fixing operation portion is easy to maintain.

According to another feature of the present invention, the tilt fixing mechanism includes a reduction gear portion including a driving side gear provided in the tilt fixing operation portion and a driven side gear provided in the tilt fixing transmission shaft. A threaded shaft portion is arranged at the rear part of the tilting fixed transmission shaft. A nut is mounted on the threaded shaft portion. The tilting fixing operation portion is rotated to rotate the tilting fixing transmission shaft about the axis line via the reduction gear portion, thereby fastening the threaded shaft portion and the nut, and the main body tilting portion is pressed and fixed to the turntable by the fastening.

Therefore, the threaded shaft portion and the thread can be fastened with a large torque without increasing the size of the tilt fixing mechanism in the right-left direction. Accordingly, the tilt fixing operation unit can be operated with a small torque.

According to another feature of the invention, the bench cutter has a support portion that supports the tilt-fixing drive shaft to the turntable. The main body tilting part is fixed by sandwiching the main body tilting part and the turntable by the support part and the nut. Therefore, an axial force (torque) of the fixed body tilting portion acts between the support portion and the nut. Therefore, no axial force is generated on the tilt fixing transmission shaft in front of the support portion. Accordingly, the body tilting portion can be fixed without applying a load to the turntable.

According to another feature of the present invention, a thrust needle bearing is provided on the support portion. Therefore, a large force in the axial direction of the tilt fixing transmission shaft can be received by the thrust needle bearing. Accordingly, the main body tilting portion can be fixed to the turntable with a large axial force.

In accordance with another feature of the present invention, the main body tilting portion can tilt in the left-right direction about the left-right tilting support shaft. The nut has a fan shape matching the circular arc shape centering around the swing support shaft. Therefore, the nut can smoothly move relative to the body tilting portion in an arc shape around the left and right tilting support shafts. Therefore, the main body tilting portion can be smoothly tilted to the left and right. Further, the nut restricts rotation of the tilt fixing transmission shaft about the axis by the inner peripheral side surface or the outer peripheral side surface of the fan shape. Therefore, a large axial force can be received by the nut. Accordingly, the main body tilting portion can be fixed with a large axial force.

According to another feature of the present invention, a rear cover is provided behind the body tilting portion. Therefore, the rear cover covers the periphery of the tilt fixing transmission shaft and the like, thereby preventing invasion of chips and the like. Accordingly, loss of axial force due to the presence of chips and the like can be suppressed. Accordingly, the main body tilting portion can be fixed with a large axial force. Further, by preventing the invasion of chips and the like, the body tilting portion can be smoothly tilted left and right.

According to another feature of the present invention, a front cover is provided on the bottom surface of the reduction gear portion. Therefore, chips and the like can be prevented from entering the reduction gear portion. Therefore, the rotation of the tilt fixing operation portion can be more reliably transmitted to the rear portion of the tilt fixing transmission shaft. Accordingly, the fixing operation of the main body tilting portion becomes smooth.

Drawings

Fig. 1 is an overall perspective view of the bench cutter according to embodiment 1.

Fig. 2 is an overall perspective view of the bench cutter according to embodiment 1.

Fig. 3 is a front view of the bench cutter according to embodiment 1.

Fig. 4 is a rear view of the bench cutter according to embodiment 1, and shows a right angle cutting state in which the rotary cutter is cut at right angles to the workpiece.

Fig. 5 is a rear view of the bench cutter according to embodiment 1, and shows a state in which the cutter body is tilted to the left and is beveled.

Fig. 6 is a rear view of the bench cutter according to embodiment 1, and shows a state in which the cutter body is tilted and tilted rightward.

Fig. 7 is a plan view of the bench cutter according to embodiment 1 with a cutter body removed.

Fig. 8 is a plan view of the bench cutter according to embodiment 1, with the cutter body removed, and shows a beveled state in which the turntable is rotated to the left.

Fig. 9 is a bottom view of the bench cutter according to embodiment 1.

Fig. 10 is a longitudinal sectional view of the lower part of the bench cutter according to embodiment 1, as shown in fig. 9.

Fig. 11 is a sectional view of XI-XI in fig. 9, and is a longitudinal sectional view of the lower part of the bench cutter according to embodiment 1.

Fig. 12 is a cross-sectional view of XII-XII in fig. 9, and is a longitudinal cross-sectional view of the table extension according to embodiment 1.

Fig. 13 is a perspective view of the tilt fixing mechanism and the forward locking mechanism according to embodiment 1.

Fig. 14 is a perspective view of the positive locking mechanism according to embodiment 1.

Fig. 15 is a bottom view of the bench cutter according to embodiment 2.

Fig. 16 is a cross-sectional view of XVI-XVI in fig. 15, and is a longitudinal cross-sectional view of a lower portion of the bench cutter according to embodiment 2.

Fig. 17 is a cross-sectional view of XVII-XVII in fig. 15, and is a longitudinal cross-sectional view of a lower portion of the bench cutter according to embodiment 2.

Fig. 18 is a front view of the reduction gear unit and its surroundings according to embodiment 2.

Fig. 19 is a rear view of the main body tilting part and the tilting fixing mechanism according to embodiment 2.

Fig. 20 is a longitudinal sectional view of the lower part of the bench cutter according to embodiment 3, and is a sectional view corresponding to the sectional views XVII to XVII in fig. 15.

Fig. 21 is a perspective view of a tilt fixing mechanism and a positive locking mechanism according to embodiment 3.

Fig. 22 is an exploded perspective view of the tilt fixing mechanism and a perspective view of the positive locking mechanism.

Fig. 23 is a bottom view of the reduction gear unit and its surroundings according to embodiment 3.

Fig. 24 is a bottom view of a front cover attached to a reduction gear unit according to embodiment 3.

Fig. 25 is a sectional view of XXV-XXV in fig. 24, and is a longitudinal sectional view of the reduction gear portion and its surroundings according to embodiment 3.

Fig. 26 is a rear view of the main body tilting part and the tilting fixing mechanism according to embodiment 3.

Fig. 27 is a rear view of a rear cover attached to a body tilting part according to embodiment 3.

[ description of reference numerals ]

1: bench cutter (embodiment 1); 2: a base; 2a: a rotating support shaft; 2b: a horizontal plate portion; 3: an auxiliary table portion; 4: a turntable; 4a: the upper surface of the workbench; 4b: an arm support section; 5: a table extension; 5a: a knife edge plate; 5b: a slot hole; 5c, 5d: a threaded hole; 5e: a spring receiving section; 6: positioning a baffle; 6a: a positioning surface; 6b: a baffle base portion; 7: a scale plate is obliquely connected; 7a: a positioning concave part; 7b: a fixing screw; 10: a cutter body; 10a: a support shaft swings up and down; 11: a cutter; 12: a fixed cover; 13: a movable cover; 14: a main body supporting part; 15: a dust collection guide; 16: a rear dust collecting port; 17. 17a, 17b: a dust collection hose; 18: a dust collector; 20: a motor housing; 20a: an air inlet; 21: an electric motor; 25: a battery mounting portion; 26: a battery; 30: a handle portion; 31: a main handle; 32: a locking button; 33: a switch operation handle; 34: a carrying handle; 35: an adapter mounting portion; 36: a communication adapter; 40: a turntable fixing mechanism; 41: a grip portion (turntable fixing operation portion); 42: a fixed lever (turntable fixing part); 43: a sandwiching member; 43a: a rotation shaft; 43b: a lever abutment; 43c: a clamping part; 45: a positive locking mechanism; 46: unlocking the rod; 46a: a positioning pin; 46b: a clamping pin; 46c: a compression spring; 46d: a gasket; 47: a pin support portion; 47a: a through hole; 47b: a guide face; 48: an adjusting bolt; 50: a main body support arm (main body tilting part); 50a: a left-right tilting pivot; 50b: an arc-shaped hole; 51: a slide bar; 52: a maximum inclination angle switching lever; 60: a tilting and swinging fixing mechanism; 61: a tilting and swinging fixing operation part; 61a: a threaded shaft portion; 61b: a lever abutment; 61c: a through hole; 62: a rotating rod; 62a: a lever rotation shaft; 63: a drive shaft (tilt-swing fixed drive shaft); 63a: a connecting part; 63b: a threaded shaft portion; 64: a nut; 64a: a gasket; 70: bench cutter (embodiment 2); 71: a table extension; 71a: a knife edge plate; 71b: a slot hole; 71c: a spring receiving section; 71d: a lever guide; 72: a main body support arm (main body tilting part); 72a: a left-right tilting pivot; 72b: an arc-shaped hole; 72c: a rotation stopping hole; 75: a positive locking mechanism; 76: unlocking the rod; 76a: a positioning pin; 76b: a compression spring; 76c: a flange portion; 80: a tilting and swinging fixing mechanism; 81: a tilting and swinging fixing operation part; 81a: a through hole; 82: a reduction gear portion; 82a: a drive side gear; 82b: a driven side gear; 83: a drive shaft (tilt-swing fixed drive shaft); 83a: a threaded shaft portion; 84: a nut; 84a: a two-sided web portion; 90: bench cutter (embodiment 3); 91: a turntable; 91a: the upper surface of the workbench; 91b: an arm support section; 91c: a through hole; 92: a table extension; 92a: a knife edge plate; 92b: a spring receiving section; 92c: a through hole; 93: a front cover; 94: a main body support arm (main body tilting part); 94a: a left-right tilting pivot; 94b: an arc-shaped hole; 94c: an inner peripheral wall; 100: a tilting and swinging fixing mechanism; 101: a tilting and swinging fixing operation part; 101a: a through hole; 102: a reduction gear portion; 102a: a drive side gear; 102b: a driven side gear; 103: a drive shaft (tilt-swing fixed drive shaft); 104: thrust needle bearings (supporting portions); 104a: a retainer; 104b: a gasket; 104c: needle roller; 105: a receiving portion (supporting portion); 106: a nut; 106a: an outer peripheral portion; 106b: an inner peripheral portion; 106c: a thread; 106d: a gasket; 107: a sleeve; 108: a rear cover.

Detailed Description

[ embodiment 1 ]

Next, embodiment 1 of the present invention will be described with reference to fig. 1 to 14. In the present embodiment, a bench cutter 1 called a so-called slide circular saw is exemplified. As shown in fig. 1, the bench cutter 1 has: a base 2 mounted on a table, a floor, or the like; a turntable 4 for placing a workpiece; and a cutter body 10. The turntable 4 is supported rotatably in the horizontal direction on the upper side of the base 2. Auxiliary table portions 3 are provided on both sides of the base 2, respectively. A circular cutter 11 called a circular saw (supported saw) is rotatably supported on the cutter body 10. The turntable 4 has a table extension 5 extending in the direction of the blade surface of the cutter 11. In the following description, the direction in which the pair of auxiliary table portions 3 are provided is the left-right direction, and the side in which the table extension portion 5 is arranged is the front side. The user is located at the front side of the bench cutter 1 to perform a cutting operation. The front-back, up-down, left-right directions of the components and structures are defined based on the user.

As shown in fig. 7, the turntable 4 is rotatable about a rotation support shaft 2a in the center of the base 2. The table top surface 4a of the turntable 4 is substantially circular in plan view. As shown in fig. 3, the table upper surface 4a is disposed on a horizontal plane. The upper surface of the auxiliary table portion 3 is disposed at a level substantially the same as the table upper surface 4 a. A knife edge plate 5a is provided on the upper surface of the table extension 5. The knife edge plate 5a is arranged at a level substantially the same as the table upper surface 4 a. As shown in fig. 1, a notch-shaped slot 5b extending along the blade surface of the cutter 11 is provided in the center of the blade plate 5a.

As shown in fig. 1, an adjustment bolt 48 is provided at the lower portion of the table extension 5, and the adjustment bolt 48 supports the table extension 5 from below. The adjusting bolt 48 is supported by the table extension 5 and is movable up and down by a screw-turning operation. The adjusting bolt 48 is moved downward by operating in the unscrewing direction. The lower end of the adjusting bolt 48 abuts on the mounting surface of the bench cutter 1, whereby the adjusting bolt 48 supports the table extension 5 so as to adjust the height of the table extension 5, and further eliminates the backlash of installation.

As shown in fig. 1, a wall-shaped positioning baffle (fence) 6 is provided above the turntable 4 and the auxiliary table portion 3, and the positioning baffle 6 extends in the left-right direction and upward. The positioning fence 6 is detachably supported by a fence base portion 6b, and the fence base portion 6b is supported by the auxiliary base portion 3 and extends in the left-right direction. As shown in fig. 7 and 8, the positioning surface 6a, which is the front surface of the positioning baffle 6, is located on a vertical plane passing through the rotating support shaft 2 a. The workpiece placed on the table top surface 4a is positioned in the front-rear direction by abutting against the positioning surface 6 a. A miter scale 7 is provided on the base 2 on the front side of the table top surface 4a, and the miter scale 7 is circular arc-shaped around the rotation support shaft 2 a.

As shown in fig. 3, the miter scale plate 7 is disposed in a horizontally extending manner at a position below the table upper surface 4 a. As shown in fig. 7, the miter scale plate 7 is provided with a plurality of positioning recesses 7a in the form of grooves extending in the radial direction. The positioning concave portions 7a are provided at predetermined angular intervals in the circumferential direction of the miter scale plate 7. A tip end portion of a positioning pin 46a (see fig. 10) described later can enter the positioning recess 7a. As shown in fig. 1, the miter scale plate 7 is fixed to the base 2 by a set screw 7 b. The hole into which the fixing screw 7b is inserted is a long hole. By unscrewing the fixing screw 7b, the miter scale plate 7 is moved in the left-right direction, and thereby the angle between the positioning baffle 6 and the cutter 11 can be finely adjusted. For example, if the positioning pin 46a (see fig. 10) is inserted into the positioning recess 7a at the right angle position, the right angle between the cutter 11 and the positioning fence 6 can be precisely adjusted. The adjustment is mainly performed during the production of the product.

As shown in fig. 1, an arm support portion 4b is provided at the rear of the turntable 4. A main body support arm (main body tilting portion) 50 extending substantially upward is provided on the rear side of the arm support portion 4b. The main body support arm 50 is supported by the arm support portion 4b so as to be tiltable in the left-right direction about a tilt pivot shaft 50a (see fig. 4) extending in the front-rear direction. A pair of upper and lower slide bars 51 extending forward are provided at the upper portion of the main body support arm 50. The slide rod 51 extends along the extending direction of the table extension 5. The slide rod 51 is provided with a main body support portion 14, and the main body support portion 14 is coupled to the cutter main body 10 and is slidable in the front-rear direction. By sliding the main body support 14 in the front-rear direction, a workpiece having a large width, for example, placed on the table top surface 4a can be cut.

As shown in fig. 1, a cutter 11 is rotatably mounted on a cutter body 10, and the blade surface of the cutter 11 extends in the front-rear direction. The cutter body 10 has a vertical swing support shaft 10a behind the cutter 11, and the axial direction of the vertical swing support shaft 10a extends in the left-right direction. The cutter body 10 can swing in the up-down direction about the up-down swing support shaft 10 a. By swinging the cutter body 10 downward, the cutter 11 can be made to cut into the workpiece placed on the table upper surface 4 a.

As shown in fig. 5 and 6, by tilting the main body support arm 50 in the left-right direction, the cutter 11 (see fig. 3) provided in the cutter main body 10 can be tilted to 45 ° in the left-right direction, respectively. Accordingly, the workpiece placed on the table top surface 4a (see fig. 4) can be subjected to so-called chamfering. A maximum inclination angle switching lever 52 is provided at a rear lower portion of the main body support arm 50. By operating the maximum inclination angle switching lever 52, the maximum inclination angle of the cutter 11 in the left-right direction can be switched, and for example, the cutter 11 can be maximally inclined to about 48 ° in the left-right direction. An arc-shaped hole 50b is provided in the lower portion of the main body support arm 50, and the arc-shaped hole 50b penetrates in the front-rear direction about the left-right tilt pivot 50 a. A drive shaft 63, which will be described later, protrudes from the front to the rear into the arc-shaped hole 50 b.

As shown in fig. 1, the cutter body 10 has a fixed cover 12 and a movable cover 13. The stationary cover 12 covers the upper half circumference of the cutter 11. The movable cover 13 can cover the lower half-circle of the cutter 11. The movable cover 13 rotates in conjunction with the vertical swing of the cutter body 10, and opens and closes the lower half-cycle of the cutter 11. When the cutter body 10 is swung upward, the movable cover rotates in the closing position direction (clockwise in fig. 1), covering the lower half-circle range of the cutter 11. When the cutter body 10 is swung downward, the movable cover is rotated in the opening position direction (counterclockwise in fig. 1), exposing the lower half-circle range of the cutter 11. Accordingly, the workpiece placed on the table top surface 4a can be cut by the exposed cutter 11.

As shown in fig. 1, a dust collection guide 15 is provided at the rear lower side of the stationary hood 12. The dust collection guide 15 has a wall shape that is substantially C-shaped in a plan view and stands up in the up-down direction in a posture in which the cutter body 10 is moved to the lower end position. The dust collection guide 15 has a front opening having a substantially C-shape in plan view. The dust collection guide 15 suppresses scattering of chips generated by cutting the workpiece to the rear or left and right sides of the cutter 11. The upper portion of the dust collection guide 15 communicates with a dust collection hose 17a extending rightward from the rear of the cutter body 10.

As shown in fig. 1, a front part of the main body support arm 50 is provided with a front-opening tubular rear dust collection port 16. The rear dust collection port 16 suppresses scattering of chips at a position rearward of the dust collection guide 15. The rear part of the rear dust collection port 16 communicates with a dust collection hose 17b extending rightward from the main body support arm 50. As shown in fig. 2, the dust collection hoses 17 (17 a, 17 b) can be connected to a dust collector 18, and the dust collector 18 is provided separately from the bench cutter 1. By activating the dust collector 18, the dust scattered around the dust collection guide 15 and the rear dust collection port 16 can be sucked into the dust collector 18 via the dust collection hoses 17a and 17 b.

As shown in fig. 2, the cutter body 10 has a motor housing 20 and a handle portion 30. The motor housing 20 and the handle portion 30 are provided on the right side of the fixed cover 12 and the movable cover 13. The motor housing 20 has a substantially cylindrical shape and is inclined rightward and upward with respect to the fixed cover 12. An intake port 20a capable of sucking outside air into the motor housing 20 is provided at the upper right side of the motor housing 20. The electric motor 21 is housed in the motor housing 20. The electric motor 21 is housed such that a motor shaft extends along the longitudinal direction of the substantially cylindrical motor housing 20. The electric motor 21 is, for example, a DC brushless motor.

The cutter 11 shown in fig. 3 is integrally attached to a main shaft (not shown) that extends in the left-right direction and is rotatably supported by the cutter body 10. A reduction gear portion is provided between the main shaft and the motor shaft of the electric motor 21. The rotation of the motor shaft is transmitted to the spindle through the reduction gear portion, thereby rotating the cutter 11.

As shown in fig. 3, in a state where the cutter 11 is located at a right angle cut position orthogonal to the upper surface of the turntable 4, the motor housing 20 is disposed in a posture inclined rightward and upward with respect to the upper surface of the turntable 4, not in parallel with the upper surface of the turntable 4. Therefore, the angle at which the cutter body 10 swings in the right-left direction can be set to be large. For example, the cutter body 10 can be inclined to the right more than in a case where the motor housing 20 is arranged parallel to the upper surface of the turntable 4.

As shown in fig. 2, a battery mounting portion 25 is provided at the rear of the motor case 20. The mounting surface of the battery mounting portion 25 is directed rearward and extends substantially along the longitudinal direction of the motor housing 20. As shown in fig. 3, the battery 26 can be mounted on the battery mounting portion 25 by sliding along the longitudinal direction of the motor case 20. The battery 26 has a substantially rectangular box shape. The battery 26 is, for example, a lithium ion battery having an output voltage of 36V. The battery 26 can be repeatedly charged and detached from the battery mounting portion 25 to be charged by a separately prepared charger. The battery 26 may be reused as a power source between a screw tightening machine or other rechargeable power tool such as an electric drill.

As shown in fig. 1, an annular main handle 31 extending in the front-rear direction is provided at the front portion of the handle portion 30. A switch lever 33 is provided on the inner peripheral side of the main handle 31. The switch lever 33 is provided so as to be capable of being gripped by a finger and operated by a user while holding the main handle 31. When the operation switch lever 33 is pushed, the electric motor 21 is started, and the cutter 11 is rotated. A lock button 32 is provided on an upper portion of the main handle 31. By pressing the lock button 32, the switch lever 33 can be operated to be locked. Hereby, an unintentional activation of the electric motor 21 is avoided.

As shown in fig. 1, the handle portion 30 includes a carrying handle 34 located rearward of the main handle 31. The carrying handle 34 has a ring shape extending in the front-rear direction and substantially in the horizontal direction in a state where the cutter body 10 is moved to the lower end position. In a state where the cutter body 10 is locked at the lower end position, the user can carry the bench cutter 1 by gripping the carrying handle 34.

As shown in fig. 1, the handle portion 30 includes a concave adapter mounting portion 35 located rearward of the carrying handle 34. The communication adapter 36 can be inserted into and mounted on the adapter mounting portion 35. Communication adapter 36 enables wireless communication between other accessory devices. By wireless communication, the start operation and stop operation of the accessory can be linked with the start operation and stop operation of the bench cutter 1. For example, the dust collector 18 (see fig. 2) provided separately from the bench cutter 1 can be linked to the bench cutter 1 via the communication adapter 36.

As shown in fig. 2, a turntable fixing mechanism 40 and a forward locking mechanism (positive lock mechanism) 45 are provided at the lower portion of the table extension 5. As shown in fig. 10, the turntable fixing mechanism 40 includes a grip portion (turntable fixing operation portion) 41 and a fixing lever (turntable fixing member) 42. The fixing rod 42 extends in the longitudinal direction (front-rear direction) of the table extension 5. As shown in fig. 12, the fixing lever 42 is disposed at the center in the lateral direction inside the table extension 5. As shown in fig. 10, the fixing rod 42 is supported by screwing with a screw hole 5c provided in the table extension 5. The front portion of the fixing lever 42 protrudes forward from the front surface of the table extension 5. The grip 41 is integrally coupled to the front of the fixing lever 42. As shown in fig. 9 and 10, the grip 41 is disposed at the center of the table extension 5 in the lateral direction, in a position forward of the front surface of the table extension 5, so as not to protrude upward from the upper surface of the table extension 5. The grip 41 has a concave-convex shape at the peripheral edge portion so that the user can easily grip and perform a rotating operation. The user grips the grip portion 41 and rotates the grip portion 41 around the axis of the fixing lever 42, thereby rotating the fixing lever 42 integrally with the grip portion 41. The pivoting fixing lever 42 is displaced in the front-rear direction by screwing in the screw hole 5 c.

As shown in fig. 10, the base 2 has a horizontal plate portion 2b extending in the horizontal direction. The horizontal plate portion 2b extends to the rotating support shaft 2a side at substantially the same height as the miter scale plate 7. A holding member 43 is provided on the rear side of the fixing lever 42. The clip member 43 has a substantially L-shape when viewed from the left-right direction. The holding member 43 is provided with a rotation shaft 43a extending in the left-right direction in the vicinity of the substantially L-shaped bent portion. The clamp member 43 is rotatably supported by the table extension 5 about a rotation shaft 43a. The holding member 43 includes: a rod abutting portion 43b located at one end of the L-shape and adapted to abut against the rear end of the fixed rod 42; and a holding portion 43c located at the other end of the L-shape and capable of abutting against the lower surface of the horizontal plate portion 2b.

When the fixed lever 42 is displaced rearward to come into contact with the lever contact portion 43b, the lever contact portion 43b is pushed rearward. At this time, the clamping member 43 rotates about the rotation shaft 43a, thereby displacing the clamping portion 43c upward. The clamping portion 43c displaced upward abuts against the lower surface of the horizontal plate portion 2b, so that the horizontal plate portion 2b is clamped between the clamping portion 43c and the table extension 5. Accordingly, the table extension 5 and the clamping member 43 cannot move in the left-right direction with respect to the horizontal plate portion 2b. Thus, the table extension 5 and the turntable 4 integral with the table extension 5 are locked for rotation relative to the base 2.

When the fixed lever 42 is displaced forward, the force pressing the lever contact portion 43b rearward becomes small (or disappears). At this time, the clamping member 43 rotates about the rotation shaft 43a, thereby displacing the clamping portion 43c downward. By displacing the clamping portion 43c downward, the clamping of the horizontal plate portion 2b by the clamping member 43 and the table extension 5 is released. Accordingly, the table extension 5 and the clamping member 43 can move in the left-right direction with respect to the horizontal plate portion 2 b. Therefore, the table extension 5 and the turntable 4 can rotate about the rotation support shaft 2a with respect to the base 2.

As shown in fig. 9, the forward locking mechanism 45 has an unlocking lever 46 and a positioning pin 46a. The lock release lever 46 is disposed forward of the front surface of the table extension 5, and is disposed leftward of the grip 41 and a tilt fixing operation portion 61 described later. As shown in fig. 10, the positioning pin 46a is provided below the fixing lever 42, and extends in the front-rear direction along the longitudinal direction of the fixing lever 42. As shown in fig. 10, the front and rear portions of the positioning pin 46a are supported by the lower portion of the table extension 5. The positioning pin 46a is rotatable about its axis and displaceable in the front-rear direction. The positioning pin 46a is provided at substantially the same height as the miter scale plate 7. The tip (rear end) of the positioning pin 46a can enter the positioning recess 7a. As shown in fig. 14, the tip of the positioning pin 46a is coupled to the base of the unlocking lever 46. The unlocking lever 46 can be operated in the up-down direction in a manner of rotating about the axis of the positioning pin 46a.

As shown in fig. 2, a pin support portion 47 is attached to a lower portion of the table extension 5. As shown in fig. 14, the pin support portion 47 includes a through hole 47a penetrating in the front-rear direction and a pair of guide surface portions 47b provided on the sides of the through hole 47 a. The pair of guide surface portions 47b are provided in a point-symmetrical manner with respect to the center of the insertion hole 47 a. The guide surface portion 47b has a fan shape with the center of the through hole 47a as the center of the circular arc when viewed from the front. One end side in the circumferential direction of the sector of the guide surface portion 47b is located forward, the other end side in the circumferential direction of the sector is located rearward, and a portion between the one end side and the other end side is provided as a spiral guide surface. In the case of the left (right) guide surface 47b shown in fig. 14, the guide surface is provided such that the lower (upper) end of the fan shape is located forward and the upper (lower) end of the fan shape is located rearward.

As shown in fig. 14, a pair of engagement pins 46b are provided at substantially the center of the positioning pin 46a in the front-rear direction. The pair of engagement pins 46b extend in opposite directions to each other in a direction orthogonal to the axial direction of the positioning pin 46 a. In a state where the positioning pins 46a are inserted through the insertion holes 47a, the pair of engagement pins 46b are placed in the pair of guide surface portions 47b, respectively. The tip of the engagement pin 46b abuts against the guide surface of the guide surface portion 47b.

As shown in fig. 13, the positioning pin 46a has a compression spring 46c on the front side of the engagement pin 46b, and further has a washer 46d on the front side of the compression spring 46 c. As shown in fig. 10, the front surface of the washer 46d abuts against the spring receiving portion 5e provided at the lower portion of the table extension 5. The forward movement of the tip of the compression spring 46c is regulated by the spring receiving portion 5 e.

The unlocking lever 46 shown in fig. 13 is pressed downward. Accordingly, the pair of engagement pins 46b rotates counterclockwise around the axial direction of the positioning pin 46 a. The tip of the engagement pin 46b rotates while maintaining a contact state with the guide surface of the guide surface portion 47 b. Therefore, the engagement pin 46b is displaced forward along the spiral guide surface inclined forward. Therefore, the positioning pin 46a integrated with the engagement pin 46b is displaced forward against the urging force of the compression spring 46 c. At this time, as shown in fig. 10, the rear end portion of the positioning pin 46a displaced forward is displaced to a position where the engagement with the positioning recess 7a can be released. Therefore, when the holding portion 41 is rotated to release the rotation lock state of the turntable 4 by the turntable fixing mechanism 40, the turntable 4 can be freely rotated in the left-right direction.

The unlocking lever 46 shown in fig. 13 is pulled upward from the lower position. Accordingly, the pair of engagement pins 46b rotates clockwise about the axis of the positioning pin 46 a. The tip of the engagement pin 46b rotates while maintaining a contact state with the guide surface of the guide surface portion 47 b. Therefore, the engagement pin 46b can be displaced rearward along the guide surface. Therefore, the positioning pin 46a integrated with the engagement pin 46b is biased by the compression spring 46 to be displaced rearward. The rear end of the positioning pin 46a abuts against the outer periphery of the miter dial 7. The positioning pin 46a enters into any one of the positioning recesses 7a provided on the outer periphery of the miter scale plate 7. In this way, the turntable 4 is positioned at a predetermined miter angle (miter angle) position corresponding to the positioning recess 7a by the forward lock mechanism 45.

As shown in fig. 1, a tilt fixing mechanism 60 is provided at the lower portion of the table extension 5, and the tilt fixing mechanism 60 holds the main body support arm 50 in a position capable of tilting in the left-right direction. As shown in fig. 13, the tilt fixing mechanism 60 has a tilt fixing operation portion 61, a rotating lever 62, and a transmission shaft (tilt fixing transmission shaft) 63. The tilt fixing operation portion 61 is rotatable about an axis extending in the front-rear direction. The tilt fixing operation portion 61 has a concave-convex shape at the peripheral edge portion so that the user can easily grip and perform a rotation operation. The concave-convex shape of the tilt fixing operation portion 61 is formed in a different pattern from the concave-convex shape of the grip portion 41. Therefore, the tilt fixing operation portion 61 and the grip portion 41 can be easily distinguished when gripped by the user, and thus, for example, erroneous operation such as simultaneous operation of the tilt fixing operation portion 61 and the grip portion 41 can be prevented. A threaded shaft portion 61a extending rearward is provided at the rear of the tilt fixing operation portion 61.

As shown in fig. 10, the tilt fixing operation portion 61 is provided at a position forward of the front surface of the table extension 5 and rearward of the grip portion 41. The threaded shaft portion 61a is screwed into a threaded hole 5d provided in the front surface of the table extension 5. A through hole 61c penetrating in the front-rear direction is provided in the center of the tilt fixing operation portion 61 and the threaded shaft portion 61a. The fixing rod 42 enters the through hole 61c. The tilt fixing operation portion 61 is rotatable about the axis of the fixing lever 42. That is, the rotation axis of the tilt fixing operation portion 61 is coaxial with the rotation axis of the grip portion 41. The tilt fixing operation portion 61 is displaced in the front-rear direction by the rotation operation of the tilt fixing operation portion 61 through the screwing of the threaded shaft portion 61a and the threaded hole 5 d.

As shown in fig. 13, the rotating lever 62 extends in a substantially horizontal direction, and has a lever rotating shaft 62a extending in an up-down direction at a substantially center in the horizontal direction. The lever contact portion 61b of the rear end portion of the threaded shaft portion 61a contacts the left front surface of the lever rotating shaft 62a of the rotating lever 62. A front end portion of a transmission shaft 63 extending in the front-rear direction is connected to the rotary lever 62 on the left side of the lever rotary shaft 62a. The coupling portion 63a that couples the transmission shaft 63 and the rotating lever 62 has an axial shape extending in the up-down direction. As shown in fig. 12, the rotating lever 62 is rotatably supported in the front-rear direction inside the table extension 5 by a lever rotating shaft 62a.

As shown in fig. 12, the transmission shafts 63 are arranged side by side on the right side of the fixed lever 42. As shown in fig. 9, the transmission shaft 63 extends in the front-rear direction at a position on the left side of the right end portion of the table extension 5 and on the right side of the rotation support shaft 2a. As shown in fig. 11, the rear portion of the drive shaft 63 penetrates the arm support portion 4b and the main body support arm 50. A threaded shaft portion 63b is provided at a rear end portion of the drive shaft 63 protruding rearward of the arc-shaped hole 50b of the main body support arm 50. A nut 64 is fastened to the threaded shaft portion 63b. Washer 64a is sandwiched between nut 64 and the rear surface of body support arm 50.

As shown in fig. 13, when the tilt fixing operation portion 61 is displaced rearward, the portion of the rotating lever 62 on the left side of the lever rotating shaft 62a is pressed by the lever contact portion 61b to be displaced rearward. Since the rotating lever 62 rotates about the shaft of the lever rotation shaft 62a, a portion of the rotating lever 62 on the right side of the lever rotation shaft 62a is pulled forward. Accordingly, the transmission shaft 63 coupled to the right portion of the rotating lever 62 is pulled forward. As shown in fig. 11, the nut 64 is pulled forward by the drive shaft 63. Accordingly, the front portion of the main body support arm 50 is pressed against the rear portion of the arm support portion 4 b. Thus, the main body support arm 50 is fixed to the arm support portion 4b and positioned at a predetermined right-left inclination angle.

As shown in fig. 13, when the tilt fixing operation portion 61 is displaced forward, the pressing force of the lever contact portion 61b that presses the portion of the rotating lever 62 on the left side of the lever rotation shaft 62a rearward is released. Accordingly, the forward pulling force is released in the portion of the rotating lever 62 on the right side of the lever rotating shaft 62 a. Accordingly, as shown in fig. 11, since the forward pulling force of the drive shaft 63 and the nut 64 is also released, the pressing force that presses the main body support arm 50 against the arm support portion 4b is released. In this way, the main body support arm 50 can tilt about the axis of the tilt pivot shaft 50a (see fig. 10) with respect to the arm support portion 4 b. When the main body support arm 50 swings sideways, the arc-shaped hole 50b is displaced about the axis of the sideways tilting support shaft 50a with respect to the rear end portion of the drive shaft 63, whereby the drive shaft 63 protruding rearward from the main body support arm 50 can be prevented from interfering with sideways tilting of the main body support arm 50.

According to the bench cutter 1 of embodiment 1 described above, the turntable 4 has a table extension portion extending forward, and is supported by the base 2 so as to be rotatable in the horizontal direction. The cutter body 10 is provided above the turntable 4, and rotatably supports the cutter 11. The turntable fixing mechanism 40 can fix the turntable 4 to the base 2. The main body support arm 50 is provided behind the arm support portion 4b of the turntable 4, and supports the cutter main body 10 so as to be tiltable in the left-right direction. The tilt fixing mechanism 60 can fix tilting of the cutter body 10 in the left-right direction. The turntable fixing mechanism 40 includes a grip portion 41 that is rotatably operable, and a fixing lever 42. The fixing lever 42 can fix the turntable 4 to the base 2 by rotating the operation grip 41. The grip 41 is disposed forward of the front surface of the table extension 5, downward of the upper surface of the turntable 4, and at the center of the table extension 5 in the lateral direction. The tilt fixing mechanism 60 includes a tilt fixing operation portion 61 that can be rotationally operated. The rotation axis of the tilt fixing operation portion 61 is coaxial with the rotation axis of the grip portion 41 and the fixing lever 42. The tilt fixing operation portion 61 is provided forward of the front surface of the table extension 5 and rearward of the grip portion 41.

Therefore, the grip portion 41 and the tilt fixing operation portion 61 are located in front of the bench cutter 1, so that the operation by the user who performs the work is easy. That is, the operability of the grip portion 41 can be maintained high, and the operability of the tilt fixing operation portion 61 can be improved. Further, the grip 41 having a higher operation frequency is provided at a position forward of the tilt fixing operation portion 61, and closer to a user positioned forward of the bench cutter 1. Therefore, erroneous operation of the tilt fixing operation portion 61 as the grip portion 41 can be suppressed. The grip 41 also functions as an operation portion to be gripped by a user when horizontally rotating the turntable 4. In this case, since the grip 41 is located at a position farther from the rotation support shaft 2a, it is easy to grip the grip 41 to rotate the turntable 4.

In addition, according to the bench cutter 1, the tilt fixing mechanism 60 has a transmission shaft 63, and the transmission shaft 63 extends from the front portion of the table extension 5 to the main body support arm 50 in the front-rear direction. The transmission shaft 63 is provided between the rotation support shaft 2a and the right end portion of the table extension 5.

Therefore, the transmission shaft 63 can be provided in the space left free between the turntable 4 and the lower part of the table extension 5, avoiding the rotation support shaft 2 a. Therefore, it is difficult to prevent the axial force transmitted to the transmission shaft 63, and the operation force of the tilt fixing operation portion 61 is easily transmitted to the main body support arm 50.

Further, the bench cutter 1 includes a forward lock mechanism 45 for positioning the turntable 4 at a predetermined rotation angle. The transmission shaft 63 is arranged on the right side of the fixing lever 42 and extends in the front-rear direction. The positioning pin 46a of the forward locking mechanism 45 is located below the fixed lever 42.

Therefore, the fixing lever 42, the transmission shaft 63, and the positioning pin 46a are arranged in a substantially right-angle triangle shape when viewed from the front. Accordingly, the turntable fixing mechanism 40 and the tilt fixing mechanism 60 can be compactly arranged in the up-down direction. Further, the positioning pin 46a of the forward lock mechanism 45 can be disposed below the fixing lever 42 which is made compact in the vertical direction. In this way, the turntable fixing mechanism 40, the tilt fixing mechanism 60, and the forward locking mechanism 45 can be arranged in a state of maintaining operability in a minimum space located below the upper surface of the table extension 5.

In addition, according to the bench cutter 1, the tilt fixing mechanism 60 has a rotating lever 62 inside the table extension 5. The rotating lever 62 is rotatable in the front-rear direction, and the left side portion is capable of abutting against the lever abutting portion 61b of the tilt fixing operation portion 61, and the right side portion is coupled to the transmission shaft 63 via the coupling portion 63 a. The tilt fixing operation portion 61 has a threaded shaft portion 61a at the rear portion, and the threaded shaft portion 61a displaces the tilt fixing operation portion 61 subjected to the rotation operation in the front-rear direction. By pressing the tilt fixing operation portion 61 rearward by the threaded shaft portion 61a, the rotating lever 62 rotates about the axis of the lever rotating shaft 62a, and the left side portion of the rotating lever 62 that is in contact with the lever contact portion 61b is pressed rearward. Accordingly, the right side portion of the rotating lever 62 causes the transmission shaft 63 to generate a forward pulling force. The main body support arm 50, which is pulled forward by the pulling force, is pressed by the rear surface of the arm support portion 4b of the turntable 4 to be fixed.

Therefore, the tilt fixing mechanism 60 can be simply configured with relatively few components such as the tilt fixing operation portion 61, the rotating lever 62, and the transmission shaft 63. Accordingly, the tilt fixing mechanism 60 can be compactly provided. In addition, the tilt fixing mechanism 60 is easy to maintain or maintenance-free, so that the operability of the tilt fixing operation portion 61 is easy to maintain.

[ embodiment 2 ]

Next, a bench cutter 70 according to embodiment 2 of the present invention will be described with reference to fig. 15 to 19. As shown in fig. 15, the bench cutter 70 has a table extension 71, a forward lock mechanism 75, a main body support arm (main body tilting portion) 72, and a tilting fixing mechanism 80, instead of the table extension 5, the forward lock mechanism 45, the main body support arm 50, and the tilting fixing mechanism 60 of the bench cutter 1 in embodiment 1 shown in fig. 9. In the following description, only the configuration different from embodiment 1 will be described in detail.

As shown in fig. 16, a knife edge plate 71a is provided on the upper surface of the table extension 71. A notch-shaped slot 71b is provided in the center of the blade plate 71a. A turntable fixing mechanism 40, a forward locking mechanism 75, and a tilt fixing mechanism 80 are provided at the lower portion of the table extension 71. As shown in fig. 15, the forward lock mechanism 75 has an unlocking lever 76 and a positioning pin 76a. The lock release lever 76 is disposed forward of the front surface of the table extension 71, and is disposed leftward of the grip 41 and a tilt fixing operation unit 81 described later. The unlocking lever 76 is integrally coupled to the tip of the positioning pin 76a. The unlocking lever 76 is operable in the up-down direction in a manner rotatable about the axis of the positioning pin 76a. As shown in fig. 16, the positioning pin 76a is provided below the fixing lever 42 and extends in the front-rear direction at substantially the same height as the miter scale 7. The positioning pin 76a is supported on the lower portion of the table extension 71 so as to be displaceable in the front-rear direction. A flange portion 76c extending in the radial direction is provided at the front portion of the positioning pin 76a. The table extension 71 has a spring receiving portion 71c on the front side of the flange 76c. A compression spring 76b is provided between the flange portion 76c and the spring receiving portion 71c. The positioning pin 76a is biased rearward by a compression spring 76b.

As shown in fig. 15, a lever guide 71d is provided at a lower portion of the table extension 71. The lever guide 71d has an inclined surface that is inclined from the front to the rear as it approaches the center from the left end of the table extension 71. The unlocking lever 76 is operated in the up-down direction while being in contact with the inclined surface of the lever guide portion 71d. When the unlocking lever 76 is pushed downward, the unlocking lever 76 is displaced forward along the inclined surface of the lever guide portion 71d. Accordingly, the positioning pin 76a integrated with the unlocking lever 76 is displaced forward against the urging force of the compression spring 76 b. Therefore, the rear end portion of the positioning pin 76a is displaced to a position where the engagement with the positioning recess 7a (see fig. 16) can be released. When the unlocking lever 76 is pulled upward, the unlocking lever 76 is displaced rearward along the inclined surface of the lever guide 71d. The positioning pin 76a is displaced rearward by the urging force of the compression spring 76b together with the lever guide portion 71d. Therefore, the rear end portion of the positioning pin 76a is displaced to a position where it can engage with the positioning recess 7 a.

As shown in fig. 15, the tilt fixing mechanism 80 has a tilt fixing operation portion 81, a reduction gear portion 82, and a transmission shaft (tilt fixing transmission shaft) 83. The tilt fixing operation portion 81 is rotatable about an axis extending in the front-rear direction. The tilt fixing operation portion 81 is provided forward of the front surface of the table extension portion 71 and rearward of the grip portion 41. A drive side gear 82a of the reduction gear portion 82 is integrally provided at the rear of the tilt fixing operation portion 81. As shown in fig. 16, a through hole 81a penetrating in the front-rear direction is provided in the center of the tilt fixing operation portion 81 and the driving side gear 82a. The fixing rod 42 enters the through hole 81a. The tilt fixing operation portion 81 and the driving side gear 82a are rotatable about the axis of the fixing lever 42. That is, the rotation axis of the tilt fixing operation portion 81 is coaxial with the rotation axis of the grip portion 41.

As shown in fig. 15, the reduction gear portion 82 has a driving side gear 82a and a driven side gear 82b. The driven side gear 82b is provided at the front end of the drive shaft 83 extending in the front-rear direction. The driven side gear 82b is rotatable about the axis of the drive shaft 83. As shown in fig. 18, the driven side gear 82b is arranged on the right side of the driving side gear 82a, and meshes with the driving side gear 82 a. The rotation of the driving side gear 82a is reduced in speed and then transmitted to the driven side gear 82b. The reduction ratio of the driving side gear 82a and the driven side gear 82b is, for example, 1:1.5. The transmission shaft 83 is disposed in a right side of the fixing lever 42. As shown in fig. 15, the transmission shaft 83 is provided on the left side of the right end portion of the table extension 71 and on the right side of the rotation support shaft 2 a. As shown in fig. 17, the rear portion of the drive shaft 83 penetrates the arm support portion 4b and the main body support arm 72. A threaded shaft portion 83a is provided at a rear end portion of the drive shaft 83 protruding rearward of the main body support arm 72. A nut 84 is attached to the threaded shaft portion 83a. A substantially planar two-sided web 84a provided at positions facing each other is formed at a front portion of the nut 84 having a cylindrical cross section.

As shown in fig. 16, the main body support arm 72 is supported by the arm support portion 4b so as to be tiltable in the left-right direction about a tilt pivot shaft 72a extending in the front-rear direction. As shown in fig. 19, an arc-shaped hole 72b and a rotation stopping hole 72c are provided in a lower portion of the main body support arm 72. The arc hole 72b is an arc hole penetrating in the front-rear direction about the left-right tilt pivot 72 a. The rotation stopping hole 72c is provided on the front side of the arc hole 72b, and is formed along the arc hole 72b. The rotation stop hole 72c is provided to have a smaller length in the width direction (radial direction around the left-right tilt pivot shaft 72 a) than the arc hole 72b. As shown in fig. 17, the shaft portion (front portion) of the nut 84 can enter the arc-shaped hole 72b. The rotation stopping hole 72c can only enter the two-sided web portion 84a. Rotation of the nut 84 is limited by the two-sided web 84a and the rotation stop hole 72c.

As shown in fig. 15, when the tilt fixing operation portion 81 is rotated, the transmission shaft 83 is decelerated via the reduction gear portion 82 and rotated around the shaft. As shown in fig. 17, the nut 84 mounted on the threaded shaft portion 83a is restricted from rotating about the axis of the drive shaft 83. Thus, when the drive shaft 83 is rotated in one direction, the nut 84 is fastened to the threaded shaft portion 83a. Accordingly, the main body support arm 72 is pressed toward the arm support portion 4b. In this way, the main body support arm 72 is fixed to the arm support portion 4b and positioned at a predetermined right-left inclination angle. When the drive shaft 83 is rotated in the opposite direction, the tightening between the nut 84 and the threaded shaft portion 83a is loosened. Accordingly, the pressing force for pressing the main body support arm 72 toward the arm support portion 4b is released. In this way, the main body support arm 72 can tilt about the axis of the tilt support shaft 72a (see fig. 16) with respect to the arm support portion 4b.

According to the table cutter 70 of embodiment 2 described above, the tilt fixing mechanism 80 includes the reduction gear portion 82 including the driving side gear 82a and the driven side gear 82 b. The driving side gear 82a is provided in the tilt fixing operation section 81. The driven side gear 82b is provided on the drive shaft 83. A threaded shaft portion 83a is provided at the rear of the drive shaft 83. A nut 84 is attached to the threaded shaft portion 83a. By rotating the tilt fixing operation portion 81, the transmission shaft 83 can be rotated via the reduction gear portion 82. The nut 84 and the threaded shaft portion 83a of the drive shaft 83 are fastened to each other, and the main body support arm 72 is pressed against the arm support portion 4b of the turntable 4. Accordingly, the main body support arm 72 is fixed to the arm support portion 4b.

Therefore, the nut 84 can be fastened with a large torque without increasing the size of the tilt fixing mechanism 80 in the left-right direction. Accordingly, the tilt fixing operation unit 81 can be operated with a small torque.

[ embodiment 3 ]

Next, a bench cutter 90 according to embodiment 3 of the present invention will be described with reference to fig. 20 to 27. As shown in fig. 20, the bench cutter 90 includes a tilt fixing mechanism 100, a turntable 91, and a main body support arm (main body tilt portion) 94, instead of the tilt fixing mechanism 80, the turntable 4, and the main body support arm 72 of embodiment 2 shown in fig. 17. In the following description, only the configuration different from those of embodiments 1 and 2 will be described in detail.

As shown in fig. 20, the turntable 91 has a table extension 92 extending in the direction of the blade surface of the cutter 11 (see fig. 1). A knife edge plate 92a is provided on the upper surface of the table extension 92. As shown in fig. 23, a turntable fixing mechanism 40, a forward locking mechanism 45, and a tilt fixing mechanism 100 are provided at the lower portion of the table extension 92. A spring receiving portion 92b protruding downward is provided at a lower portion of the table extension 92. The spring receiving portion 92b restricts forward movement of the washer 46d biased forward by the compression spring 46c of the forward lock mechanism 45.

As shown in fig. 20, the turntable 91 has an arm support portion 91b behind a horizontal table upper surface 91 a. A circular insertion hole 91c penetrating in the front-rear direction is provided at the lower portion of the arm support portion 91b. A main body support arm 94 extending substantially upward is provided on the rear side of the arm support portion 91b. The main body support arm 94 is supported by the arm support portion 91b so as to be tiltable in the left-right direction about a tilting support shaft 94a (see fig. 26). As shown in fig. 26, the main body support arm 94 has an arc-shaped hole 94b penetrating in the front-rear direction about the left-right tilt pivot shaft 94 a.

As shown in fig. 23, the tilt fixing mechanism 100 includes a tilt fixing operation unit 101, a reduction gear unit 102, and a transmission shaft (tilt fixing transmission shaft) 103. The tilt fixing operation portion 101 is rotatable about an axis extending in the front-rear direction. As shown in fig. 25, the tilt table extension 92 is provided with a through hole 92c extending in the front-rear direction. The shaft portion of the tilt fixing operation portion 101 enters the through hole 92c and is rotatably supported around the shaft.

As shown in fig. 23, the tilt fixing operation portion 101 is provided at a position forward of the front surface of the table extension 92 and rearward of the grip portion 41 of the turntable fixing mechanism 40. A reduction gear portion 102 is provided behind the tilt fixing operation portion 101. The reduction gear portion 102 includes a driving side gear 102a and a driven side gear 102b. The driving side gear 102a is integrally provided with the rear portion of the tilt fixing operation portion 101. As shown in fig. 25, a through hole 101a through which the fixing lever 42 can enter is provided in the center of the tilt fixing operation portion 101 and the drive side gear 102 a. The tilt fixing operation portion 101 and the driving side gear 102a are rotatable about the axis of the fixing lever 42. That is, the rotation axis of the tilt fixing operation unit 101 is coaxial with the rotation axis of the grip 41 (see fig. 23).

As shown in fig. 23, the driven side gear 102b is provided at the front end of the drive shaft 103 extending in the front-rear direction. The driven side gear 102b is rotatable about the axis of the drive shaft 103. The driven side gear 102b is arranged on the right side of the driving side gear 102a, and meshes with the driving side gear 102 a. The rotation of the driving side gear 102a is reduced and transmitted to the driven side gear 102b. The reduction ratio of the driving side gear 102a and the driven side gear 102b is, for example, 1:2.2. As shown in fig. 25, the transmission shaft 103 is provided on the right side of the fixed lever 42 and on the left side of the right end portion of the table extension 92.

As shown in fig. 24, a front cover 93 is attached to a lower portion of the table extension 92. The front cover 93 covers the reduction gear portion 102, particularly the driven side gear 102b (see fig. 23) from below. The lower surface of the table extension 92 has a U-shaped groove extending in the front-rear direction and opening downward. The front portion of the transmission shaft 103 is sandwiched by a pair of U-shaped grooves of the front cover 93 and the table extension 92 from both upper and lower sides, and the transmission shaft 103 is rotatably supported about an axis.

As shown in fig. 21 and 22, a thrust needle bearing 104 and a receiving portion (supporting portion) 105 are mounted on the rear portion of the drive shaft 103. The thrust needle bearing 104 and the receiving portion 105 are supporting portions of the drive shaft 103, which axially position the drive shaft 103 with respect to the turntable 91 (see fig. 20). The thrust needle bearing 104 includes a disk-shaped cage (cage) 104a and a pair of washers 104b that sandwich the cage 104a from both front and rear sides. The cage 104a is provided with a plurality of needle rollers 104c, and the plurality of needle rollers 104c are arranged at substantially equal intervals in the circumferential direction of the cage 104a and extend in the radial direction of the cage 104 a. The propeller shaft 103 has a receiving portion 105 at the front of the thrust needle bearing 104. The receiving portion 105 is fixed to the rear portion of the drive shaft 103. The receiving portion 105 restricts forward movement of the thrust needle bearing 104 relative to the propeller shaft 103.

As shown in fig. 21 and 22, the propeller shaft 103 includes a cylindrical sleeve 107 located rearward of the thrust needle bearing 104. A nut 106 is attached to the rear end portion of the drive shaft 103. Behind the nut 106, a screw 106c is mounted to the drive shaft 103 via a washer 106 d. The rearward movement of the nut 106 is restricted by tightening the screw 106c to the drive shaft 103.

As shown in fig. 22 and 26, the nut 106 has a fan shape when viewed from the front-rear direction. An outer peripheral portion 106a extending in an arc shape is provided on an outer peripheral side surface of the fan-shaped nut 106. An inner peripheral portion 106b extending in an arc shape is provided on an inner peripheral side surface of the sector nut 106. The outer peripheral portion 106a and the inner peripheral portion 106b extend around the left-right tilt pivot 94a as arc centers.

As shown in fig. 20, the drive shaft 103 extends in the front-rear direction, passing through the through hole 91c and the arc hole 94b. The thrust needle bearing 104 and the receiving portion 105 are disposed in front of the through hole 91 c. The rear surface of the thrust needle bearing 104 can abut against the front end of the arm support portion 91 b. The sleeve 107 is disposed in the through hole 91 c. By providing the sleeve 107 between the drive shaft 103 and the wall surface of the through hole 91c, the drive shaft 103 can smoothly rotate about the axis within the through hole 91 c. The nut 106 is disposed rearward of the arcuate hole 94b. Accordingly, the thrust needle bearing 104 and the nut 106 sandwich the main body support arm 94 and the arm support portion 91b in the front-rear direction.

As shown in fig. 26, the main body support arm 94 has an arcuate inner peripheral wall 94c extending about the left-right tilt pivot shaft 94 a. The inner peripheral wall 94c is disposed rearward of the arc-shaped hole 94 b. The inner peripheral wall 94c is disposed radially inward of the arc hole 94b about the left-right tilt pivot shaft 94 a. The inner peripheral portion 106b of the nut 106 can abut against the inner peripheral wall 94c. The rotation of the inner peripheral portion 106b in contact with the inner peripheral wall 94c about the axis of the propeller shaft 103 (see fig. 20) is restricted. When the main body support arm 94 is tilted to the left and right, the inner peripheral portion 106b slides along the inner peripheral wall 94c around the tilt support shaft 94 a.

As shown in fig. 20 and 27, a rear cover 108 is attached to the rear end of the lower portion of the main body support arm 94. The rear cover 108 covers the rear of the tilt fixing mechanism 100 from the outside. Accordingly, chips and the like can be prevented from entering the tilt fixing mechanism 100.

As shown in fig. 20, when the tilt fixing operation unit 101 (see fig. 23) is rotated, the transmission shaft 103 is decelerated via the reduction gear unit 102 to rotate around the axis line. The nut 106 mounted on the rear end portion of the drive shaft 103 is restrained from rotating about the axis of the drive shaft 103. Therefore, when the drive shaft 103 is rotated in one direction, the nut 106 is fastened to the drive shaft 103. Accordingly, a shaft force in the extending direction of the drive shaft 103 is generated between the thrust needle bearing 104 and the nut 106. The thrust needle bearing 104 and the nut 106 press the arm support portion 91b and the main body support arm 94 from the front and rear sides by axial force. Thus, the main body support arm 94 is fixed to the arm support portion 91b and positioned at a predetermined right-left inclination angle. When the drive shaft 103 is rotated in the opposite direction, the nut 106 is loosened with respect to the tightening of the drive shaft 103. Accordingly, the axial force between the thrust needle bearing 104 and the nut 106 is released. In this way, the main body support arm 94 can tilt about the axis of the tilt support shaft 94a (see fig. 26) with respect to the arm support portion 91 b.

According to the bench cutter 90 of embodiment 3, the tilt fixing mechanism 100 includes the thrust needle bearing 104 and the receiving portion 105 for supporting the transmission shaft 103 on the turntable 91. The main body support arm 94 and the arm support portion 91b of the turntable 91 are sandwiched from the front and rear sides by the thrust needle bearings 104 and the nuts 106, whereby the main body support arm 94 is fixed to the arm support portion 91b. Accordingly, the axial force of the fixed body support arm 94 acts between the thrust needle bearing 104, the receiving portion 105, and the nut 106. Therefore, the axial force is not generated on the drive shaft 103 in front of the thrust needle bearing 104 and the receiving portion 105. Accordingly, the main body support arm 94 can be fixed without applying a load to the turntable 91.

In addition, according to the bench cutter 90, the thrust needle bearing 104 is provided on a support portion that supports the transmission shaft 103 to the turntable 91. Accordingly, a large force in the axial direction of the drive shaft 103 can be received by the thrust needle bearing 104. Accordingly, the main body support arm 94 can be fixed to the arm support portion 91b of the turntable 91 with a large axial force.

In addition, according to the bench cutter 90, the main body support arm 94 can tilt in the left-right direction about the left-right tilt pivot 94 a. The nut 106 has a fan shape that matches the circular arc shape centered on the left-right tilt pivot 94 a. Therefore, the nut 106 can smoothly move relative to the main body support arm 94 in an arc shape around the left-right tilt pivot shaft 94 a. Therefore, the main body support arm 94 can be smoothly tilted to the left and right. The nut 106 is in contact with the inner peripheral wall 94c of the main body support arm 94 via the inner peripheral portion 106b, so that rotation of the drive shaft 103 about the axis can be restricted. Accordingly, a large axial force can be received by the nut 106. Accordingly, the main body support arm 94 can be fixed to the arm support portion 91b with a large axial force.

Further, according to the bench cutter 90, a rear cover 108 is provided behind the main body support arm 94. Therefore, by covering the periphery of the propeller shaft 103 and the like with the rear cover 108, invasion of chips and the like can be prevented. Accordingly, loss of axial force due to the presence of chips and the like can be suppressed. Accordingly, the main body support arm 94 can be fixed with a large axial force. Further, by preventing the invasion of chips and the like, the main body support arm 94 can be smoothly tilted sideways.

In addition, according to the bench cutter 90, a front cover 93 is provided on the bottom surface of the reduction gear portion 102. Therefore, chips and the like can be prevented from entering the reduction gear portion 102. Therefore, the rotation of the tilt fixing operation unit 101 can be transmitted to the rear portion of the drive shaft 103 more reliably. Accordingly, the fixing operation of the main body support arm 94 becomes smooth.

[ other modifications ]

Various modifications may be made to the bench cutters 1, 70, 90 of the respective embodiments described above. Although the case where the lever rotation shaft 62a is provided substantially in the center in the left-right direction of the rotation lever 62 has been illustrated, in order to utilize the lever principle, for example, the lever rotation shaft 62a may be provided at a position closer to the coupling portion 63 a. With this configuration, the pressing force for pressing the main body support arm 50 toward the arm support portion 4b can be further increased without changing the force with which the lever contact portion 61b of the tilt fixing operation portion 61 presses the rotary lever 62 rearward. The transmission shaft 63 may be provided on the right side of the left end portion of the table extension 5 and on the left side of the rotation support shaft 2 a. Although the case where the drive shafts 63, 83 are provided at substantially the same height is illustrated, for example, the drive shafts 63, 83 may be disposed below the respective embodiments. According to the above configuration, the triangles of the fixing lever 42, the transmission shafts 63 and 83, and the positioning pins 46a and 76a as viewed from the front side can be set smaller, and the vertical and horizontal directions of the table extension can be made compact. In addition, the reduction ratio of the reduction gear portion 82 can be set to be larger.

Although the table type cutting machines 1, 70, and 90 are exemplified as the sliding type circular saw having two functions of the sliding operation and the up-and-down swinging operation, the present invention is also applicable to, for example, a table type cutting machine which cannot perform the sliding operation but can perform only the up-and-down swinging operation.

Claims

1. A bench cutting machine is characterized in that,

comprises a base, a rotary table, a cutting machine main body, a rotary table fixing mechanism, a main body tilting part and a tilting fixing mechanism, wherein,

the turntable is supported on the base in a horizontally rotatable manner;

the cutter body is arranged above the turntable and rotatably supports a cutter;

the turntable fixing mechanism is capable of fixing the turntable to the base;

the main body tilting part is arranged at the rear of the turntable and supports the cutter main body in a manner of tilting in the left-right direction;

the tilting fixing mechanism can fix tilting of the cutter body in the left-right direction,

the turntable fixing mechanism has: a turntable fixing operation section capable of being rotationally operated; and a turntable fixing part, wherein,

the turntable fixing member is configured to be capable of fixing the turntable to the base by rotating the turntable fixing operation portion,

The turntable fixing operation section is located forward of the front surface of the turntable and downward of the upper surface of the turntable, and is disposed at the center in the lateral direction of the turntable,

the tilt fixing mechanism is provided with a tilt fixing operation part capable of rotating and operating,

the rotation shaft of the tilting fixed operation part and the rotation shaft of the turntable fixed operation part are coaxially arranged,

the tilt fixing operation portion is located forward of the front surface of the turntable and is provided rearward of the turntable fixing operation portion,

the tilt fixing mechanism has a tilt fixing transmission shaft extending from the front part of the turntable in the front-rear direction to the main body tilt part,

the tilt fixing transmission shaft is disposed between a rotation center and a left end portion of the turntable or between the rotation center and a right end portion of the turntable,

the tilt fixing mechanism has a reduction gear portion constituted by a driving side gear provided to the tilt fixing operation portion and a driven side gear provided to the tilt fixing transmission shaft,

a threaded shaft part is arranged at the rear part of the tilting fixed transmission shaft, a nut is arranged on the threaded shaft part,

The tilting fixing operation portion is rotated to rotate the tilting fixing transmission shaft about the axis line via the reduction gear portion, thereby fastening the threaded shaft portion and the nut, and the main body tilting portion is pressed and fixed to the turntable by the fastening.

2. The bench cutter as in claim 1 wherein,

has a positive locking mechanism which positions the turntable at a prescribed rotation angle,

the tilting fixed transmission shaft is arranged left and right relative to the turntable fixing part,

the positive locking mechanism is located below the turntable securing member.

3. The bench cutter as claimed in claim 1 or 2, wherein,

the tilt fixing mechanism has a rotary lever rotatable in the front-rear direction, one side of which is capable of abutting against the tilt fixing operation portion, and the other side of which is connected to the tilt fixing transmission shaft,

the tilt fixing operation portion has a threaded shaft portion that displaces the tilt fixing operation portion subjected to the rotation operation in the front-rear direction,

the tilting fixing operation portion is displaced rearward by the threaded shaft portion, whereby the rotating lever abutting against the tilting fixing operation portion is rotated to generate a forward pulling force on the tilting fixing transmission shaft, and the main body tilting portion is pressed and fixed on the turntable by the pulling force.

4. The bench cutter as in claim 1 wherein,

comprises a support part for supporting the tilt fixing transmission shaft on the turntable,

the main body tilting portion is fixed by sandwiching the main body tilting portion and the turntable by the support portion and the nut.

5. The bench cutter as in claim 4 wherein,

the support portion is provided with a thrust needle bearing.

6. The bench cutter as in claim 4 or 5 wherein,

the main body tilting part can tilt in the left-right direction around a left-right tilting support shaft,

the nut is a sector shape matching the circular arc shape centering around the left-right tilting fulcrum.

7. The bench cutter as in claim 4 or 5 wherein,

a rear cover is arranged behind the main body tilting part.

8. The bench cutter as in claim 4 or 5 wherein,

a front cover is provided on the bottom surface of the reduction gear portion.