JP2021035758A - Table cutter - Google Patents

Abstract

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

Description

The present invention relates to a tabletop cutting machine used for cutting wood, for example, which can perform inclined cutting.

This type of tabletop cutting machine includes, for example, a base placed on a tabletop or the like, a turntable supported so as to be horizontally rotatable on the base, and a cutting machine main body supported above the turntable. The cutting material can be cut by cutting the cutting tool rotatably supported by the cutting machine body into the material to be cut placed on the turntable. The cutting machine main body is provided so as to be tiltable in the left-right direction with respect to the turntable, and is provided to enable so-called tilt cutting. In this case, the desktop cutting machine is provided with a tilt fixing operation unit. As described in Patent Documents 1 to 3, the tilt fixing operation unit tilts the cutting machine main body in the left-right direction at a predetermined tilt angle, and makes it possible to fix the posture of the cutting machine main body at the tilt angle. This makes it possible to perform so-called inclined cutting in which, for example, the cutting machine main body is tilted 45 ° to the right to cut the cutting tool into the material to be cut.

Conventionally, as described in Patent Document 1, for example, the tilt fixing operation unit is provided on the back side (rear side) of the main body tilting portion that supports the cutting machine main body in a tiltable manner. The main body tilting portion is provided behind the turntable. That is, the tilt fixing operation unit described in Patent Document 1 is provided at a position far from the user located in front of the desktop cutting machine. Therefore, it is necessary for the user to reach or move to the rear of the tilting portion of the main body, and it may be difficult to operate the tilting fixing operation portion.

The desktop cutting machine described in Patent Document 2 is provided with a tilt fixing operation portion in front of a slide bar extending forward from the tilt portion of the main body. The operating force of the tilt fixing operation unit is transmitted to the screw connecting the main body tilt unit and the turntable via, for example, a plurality of gears. Alternatively, the operating force of the tilt fixing operation unit is transmitted to the screw connecting the main body tilt unit and the turntable via, for example, the drive side pulley, the driven side pulley, and the belt bridged between them. Therefore, the configuration of the tilt fixing operation mechanism is complicated and the number of parts is large, so that there is room for improvement.

The tabletop cutting machine described in Patent Document 3 is provided with a tilt fixing operation portion on a table extension portion extending forward from the turntable. This tilt fixing operation unit is provided in front of the turntable fixing operation unit that enables the turntable to be fixed at a predetermined angle (miter angle) in the horizontal direction. The turntable fixing operation unit also functions as a grip portion when rotating the turntable in the left-right direction. However, the tilt fixing operation unit and the turntable fixing operation unit are provided at positions deviated from the center in the left-right direction of the table extension portion. That is, the blade surface of the cutting tool and the turntable fixing operation unit are displaced from each other in the left-right direction. Therefore, when adjusting the miter angle of the turntable, for example, it may be difficult to align the blade surface of the cutting tool with the sumi wire attached to the material to be cut. Further, when the turntable fixing operation unit is gripped and the turntable is rotated, it is difficult to operate so as not to grip the tilt fixing operation unit located in front. When gripping the tilt fixing operation unit together with the turntable fixing operation unit, there is a risk of erroneously operating the tilt fixing operation unit. Further, it is necessary to provide the knob of the tilt fixing operation unit to be thinner than the knob of the turntable fixing operation unit, and it may be difficult to transmit the operating force of the tilt fixing operation unit to the rear main body tilting unit.

JP-A-2009-226529 Japanese Unexamined Patent Publication No. 2015-150633 Japanese Unexamined Patent Publication No. 11-48029

An object of the present invention is to provide a tilt fixing operation unit having good operability in a desktop cutting machine capable of tilt cutting.

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

Therefore, the turntable fixing operation unit and the tilt fixing operation unit are easily operated by a user who works by being located in front of the tabletop cutting machine. That is, it is possible to improve the operability of the tilt fixing operation unit while maintaining high operability of the turntable fixing operation unit. Further, the turntable fixing operation unit, which is operated more frequently, is provided in front of the tilt fixing operation unit, and is closer to the user located in front of the desktop cutting machine. Therefore, it is possible to prevent the tilt fixing operation unit from being mistakenly operated as the turntable fixing operation unit. Further, the turntable fixing operation unit also functions as an operation unit gripped by the user when the turntable is rotated horizontally. In this case, since the turntable fixing operation unit is located at a position farther from the rotation center of the turntable, it is easy to grip the turntable fixing operation unit and rotate the turntable.

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

Therefore, the tilting fixed transmission shaft can be provided in the vacant space below the turntable while avoiding the rotation shaft of the turntable. Therefore, the axial force and the rotational force transmitted to the tilt-fixing transmission shaft are not easily disturbed, and the operation force of the tilt-fixing operation unit can be easily transmitted to the main body tilting portion.

According to another feature of the present disclosure, the tabletop cutting machine is provided with a positive lock mechanism for positioning the turntable at a predetermined rotation angle. The tilting fixed transmission shafts are arranged side by side with respect to the turntable fixing member. The positive lock mechanism is located below the turntable fixing member.

Therefore, the turntable fixing mechanism and the tilt fixing mechanism can be compactly arranged in the vertical direction. Further, the positive lock mechanism can be arranged below the turntable fixing member vacated by the compactification in the vertical direction. As a result, the turntable fixing mechanism, the tilt fixing mechanism, and the positive lock mechanism can be arranged in the minimum space below the table surface of the turntable while maintaining operability.

According to another feature of the present disclosure, the tilt fixing mechanism includes a rotating rod. The rotary rod is rotatable in the front-rear direction, one side is in contact with the tilt fixing operation unit, and the other side is connected to the tilt fixing transmission shaft. The tilt fixing operation unit includes a screw shaft portion that displaces the rotation-operated tilt fixing operation unit in the front-rear direction. By displacing the tilt fixing operation portion backward by the screw shaft portion, the rotating rod in contact with the tilt fixing operation portion rotates to generate a forward pulling force on the tilt fixing transmission shaft. By the pulling force, the tilting part of the main body is pressed against the turntable and fixed.

Therefore, the tilt fixing mechanism can have a simple structure. As a result, the tilt fixing mechanism can be provided compactly. Further, the tilt fixing mechanism can be easily maintained or maintenance-free, and it is easy to maintain the operability of the tilt fixing operation unit.

According to another feature of the present disclosure, the tilt fixing mechanism includes a reduction gear portion composed of a drive side gear provided on the tilt fixing operation unit and a driven side gear provided on the tilt fixing transmission shaft. A screw shaft portion is provided at the rear portion of the tilt fixed transmission shaft. A nut is attached to the screw shaft. By rotating the tilt fixing operation part, the tilt fixing transmission shaft rotates around the axis via the reduction gear part. By tightening the screw shaft part and the nut, the body tilt part is pressed against the turntable. It is fixed.

Therefore, the screw shaft portion and the screw can be tightened with a large torque without increasing the size of the tilt fixing mechanism in the left-right direction. As a result, the tilt fixing operation unit can be operated with a relatively small torque.

According to another feature of the present disclosure, the tabletop cutting machine has a support portion that supports the tilting fixed transmission shaft with respect to the turntable. The main body tilting part is fixed by sandwiching the main body tilting part and the turntable between the support part and the nut. Therefore, the axial force (torque) that fixes the body tilting portion acts between the support portion and the nut. Therefore, no axial force is generated on the tilt fixed transmission shaft in front of the support portion. As a result, the tilting portion of the main body can be fixed without applying a load to the turntable.

According to another feature of the present disclosure, a thrust needle bearing is provided on the support portion. Therefore, the thrust needle bearing can receive a large axial force of the tilt fixed transmission shaft. As a result, the tilting portion of the main body can be fixed to the turntable with a large axial force.

According to other features of the present disclosure, the body tilting portion can tilt in the left-right direction about the left-right tilt support axis. The nut has a fan shape that matches the arc shape centered on the left-right tilting support shaft. Therefore, the nut can smoothly move relative to the tilting portion of the main body in an arc shape around the left / right tilting support shaft. Therefore, the tilting portion of the main body can be smoothly tilted to the left or right. Further, the nut can regulate the rotation of the tilt fixed transmission shaft around the axis on the inner peripheral side surface or the outer peripheral side side surface of the fan shape. Therefore, a large axial force can be received by the nut. As a result, the tilting portion of the main body can be fixed with a large axial force.

According to another feature of the present disclosure, a rear cover is provided behind the body tilting portion. Therefore, it is possible to prevent the intrusion of chips and the like by covering the periphery of the tilting fixed transmission shaft and the like with the rear cover. As a result, the loss of axial force due to the presence of chips and the like can be suppressed. As a result, the tilting portion of the main body can be fixed with a large axial force. Further, by preventing the intrusion of chips and the like, the tilting portion of the main body can be smoothly tilted to the left and right.

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

It is an overall perspective view of the desktop cutting machine which concerns on 1st Embodiment. It is an overall perspective view of the desktop cutting machine which concerns on 1st Embodiment. It is a front view of the tabletop cutting machine which concerns on 1st Embodiment. It is a rear view of the tabletop cutting machine which concerns on 1st Embodiment, and is the figure which shows the state of right-angle cutting which cuts the rotary cutting tool at a right angle with respect to the material to be cut. It is a rear view of the tabletop cutting machine which concerns on 1st Embodiment, and is the figure which shows the state of the inclined cutting which tilted the cutting machine main body to the left. It is a rear view of the tabletop cutting machine which concerns on 1st Embodiment, and is the figure which shows the state of the inclined cutting which tilted the cutting machine main body to the right. It is a top view of the state which excluded the cutting machine main body of the desktop cutting machine which concerns on 1st Embodiment. It is a top view of the state which excludes the cutting machine main body of the tabletop cutting machine which concerns on 1st Embodiment, and is the figure which shows the state of diagonal cutting which rotated the turntable to the left. It is a bottom view of the tabletop cutting machine which concerns on 1st Embodiment. 9 is a cross-sectional view taken along line XX in FIG. 9, which is a vertical cross-sectional view of the lower part of the desktop cutting machine according to the first embodiment. 9 is a cross-sectional view taken along the line XI-XI in FIG. 9, which is a vertical cross-sectional view of the lower part of the desktop cutting machine according to the first embodiment. 9 is a cross-sectional view taken along the line XII-XII in FIG. 9, which is a vertical cross-sectional view of a table extension portion according to the first embodiment. It is a perspective view of the tilt fixing mechanism and the positive lock mechanism which concerns on 1st Embodiment. It is a perspective view of the positive lock mechanism which concerns on 1st Embodiment. It is a bottom view of the tabletop cutting machine which concerns on 2nd Embodiment. FIG. 15 is a cross-sectional view taken along the line XVI-XVI in FIG. 15, which is a vertical cross-sectional view of the lower part of the desktop cutting machine according to the second embodiment. FIG. 15 is a cross-sectional view taken along the line XVII-XVII in FIG. 15, which is a vertical cross-sectional view of the lower part of the desktop cutting machine according to the second embodiment. It is a front view of the reduction gear part and its surroundings which concerns on 2nd Embodiment. It is a rear view of the main body tilting part and the tilting fixing mechanism which concerns on 2nd Embodiment. It is a vertical sectional view of the lower part of the desktop cutting machine which concerns on 3rd Embodiment, and is the sectional view corresponding to the cross-sectional view taken along the line XVII-XVII in FIG. It is a perspective view of the tilt fixing mechanism and the positive lock mechanism which concerns on 3rd Embodiment. It is an exploded perspective view of the tilt fixing mechanism and the perspective view of a positive lock mechanism. It is a bottom view of the reduction gear part and its surroundings which concerns on 3rd Embodiment. It is a bottom view which attached the front cover to the reduction gear part which concerns on 3rd Embodiment. FIG. 24 is a cross-sectional view taken along the line XXV-XXV in FIG. 24, and is a vertical cross-sectional view of the reduction gear portion and its surroundings according to the third embodiment. It is a rear view of the main body tilting part and the tilting fixing mechanism which concerns on 3rd Embodiment. It is a rear view which attached the rear cover to the body tilting part which concerns on 3rd Embodiment.

[First Embodiment]
Next, the first embodiment of the present invention will be described with reference to FIGS. 1 to 14. In this embodiment, a desktop cutting machine 1 called a so-called slide circular saw is illustrated. As shown in FIG. 1, the tabletop cutting machine 1 includes a base 2 placed on a tabletop, a floor, or the like, a turntable 4 for placing a material to be cut, and a cutting machine main body 10. A turntable 4 is rotatably supported on the upper side of the base 2 in the horizontal direction. Auxiliary table portions 3 are provided on both side portions of the base 2. A circular cutting tool 11 called a tip saw is rotatably supported on the cutting machine main body 10. The turntable 4 has a table extension portion 5 extending along the blade surface direction of the cutting tool 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 on the front side of the desktop cutting machine 1 to perform cutting work. The front-back, up-down, left-right directions of the members and configurations are specified with reference to the user.

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

As shown in FIG. 1, an adjust bolt 48 that supports the table extension portion 5 from below is provided in the lower portion of the table extension portion 5. The adjust bolt 48 is supported by the table extension portion 5 and can move up and down by screw operation. The adjust bolt 48 moves downward by operating in the screw loosening direction. When the lower end of the adjust bolt 48 comes into contact with the mounting surface of the tabletop cutting machine 1, the adjust bolt 48 supports the table extension portion 5 in a height-adjustable manner and eliminates rattling in installation.

As shown in FIG. 1, a wall-shaped positioning fence 6 extending in the left-right direction and extending upward is provided on the upper side of the turntable 4 and the auxiliary table portion 3. The positioning fence 6 is detachably supported by a fence base portion 6b that is supported by the auxiliary table portion 3 and extends in the left-right direction. As shown in FIGS. 7 and 8, the positioning surface 6a, which is the front surface of the positioning fence 6, is located on a vertical surface passing through the rotary support shaft 2a. The material to be cut placed on the table upper surface 4a is positioned in the front-rear direction by hitting the positioning surface 6a. An arcuate miter scale plate 7 centered on the rotary support shaft 2a is provided on the front side of the table upper surface 4a of the base 2.

As shown in FIG. 3, the miter scale plate 7 is provided so as to extend horizontally below the table upper surface 4a. As shown in FIG. 7, the miter scale plate 7 is provided with a plurality of groove-shaped positioning recesses 7a extending in the radial direction. The positioning recesses 7a are provided at predetermined angular intervals in the circumferential direction of the miter scale plate 7. The tip of the positioning pin 46a (see FIG. 10), which will be 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 fixing screw 7b. The hole into which the fixing screw 7b is inserted is an elongated hole. The angle between the positioning fence 6 and the cutting tool 11 can be finely adjusted by loosening the fixing screw 7b and moving the miter scale plate 7 in the left-right direction. For example, if the positioning pin 46a (see FIG. 10) is inserted into the positioning recess 7a at a right angle position, the right angle between the cutting tool 11 and the positioning fence 6 can be precisely adjusted. This adjustment is mainly made during the production process of the product.

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

As shown in FIG. 1, a cutting tool 11 whose blade surface extends in the front-rear direction is rotatably attached to the cutting machine main body 10. The cutting machine main body 10 has a vertical swing support shaft 10a whose axial direction extends in the left-right direction behind the cutting tool 11. The cutting machine main body 10 can swing in the vertical direction about the vertical swing support shaft 10a. By swinging the cutting machine main body 10 downward, the cutting tool 11 can be cut into the material to be cut placed on the table upper surface 4a.

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

As shown in FIG. 1, the cutting machine main body 10 includes a fixed cover 12 and a movable cover 13. The fixed cover 12 covers the range of the upper half circumference of the cutting tool 11. The movable cover 13 can cover the lower half circumference of the cutting tool 11. The movable cover 13 rotates in conjunction with the vertical swing of the cutting machine main body 10 to open and close the lower half circumference of the cutting tool 11. When the cutting machine main body 10 is swung upward, the movable cover rotates in the closing position direction (clockwise in FIG. 1), and the lower half circumference range of the cutting tool 11 is covered. When the cutting machine main body 10 is swung downward, the movable cover rotates in the opening position direction (counterclockwise direction in FIG. 1), and the lower half circumference range of the cutting tool 11 is exposed. As a result, the material to be cut placed on the table upper surface 4a can be cut by the exposed cutting tool 11.

As shown in FIG. 1, a dust collecting guide 15 is provided on the lower rear side of the fixed cover 12. The dust collecting guide 15 has a substantially C-shaped wall shape in a plan view that stands up in the vertical direction in a posture in which the cutting machine main body 10 is moved to the lower end position. The front side of the dust collection guide 15 has a substantially C-shape in a plan view. The dust collecting guide 15 suppresses the chips generated by cutting the material to be cut from scattering to the rear or both left and right sides of the cutting tool 11. The upper part of the dust collecting guide 15 communicates with the dust collecting hose 17a extending to the right from the rear part of the cutting machine main body 10.

As shown in FIG. 1, a tubular rear dust collecting port 16 having an open front is provided at the front portion of the main body support arm 50. The rear dust collecting port 16 suppresses the scattering of chips further behind the dust collecting guide 15. The rear portion of the rear dust collecting port 16 communicates with the dust collecting hose 17b extending to the right from the main body support arm 50. As shown in FIG. 2, the dust collector hoses 17 (17a, 17b) can be connected to the dust collector 18 installed separately from the desktop cutting machine 1. By activating the dust collector 18, chips 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 17b.

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

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

As shown in FIG. 3, the motor housing 20 is tilted upward to the right rather than parallel to the upper surface of the turntable 4 in a state where the cutting tool 11 is positioned at a right-angled cutting position orthogonal to the upper surface of the turntable 4. It is arranged in a right-angled posture. Therefore, the angle at which the cutting machine main body 10 is tilted in the left-right direction can be set larger to the right. For example, the cutting machine main body 10 can be tilted more to the right as compared with the form in which 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 behind the motor housing 20. The mounting surface of the battery mounting portion 25 faces 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 it along the longitudinal direction of the motor housing 20. The battery 26 has a substantially rectangular box shape. The battery 26 is, for example, a lithium ion battery having an output voltage of 36 V. The battery 26 can be recharged repeatedly, and can be charged by removing it from the battery mounting portion 25 and charging it with a separately prepared charger. The battery 26 can be reused as a power source with other rechargeable power tools such as screw tighteners and electric drills.

As shown in FIG. 1, a loop-shaped main handle 31 extending in the front-rear direction is provided on 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 that the user can hang a finger on the main handle 31 and pull the switch lever 33. When the switch lever 33 is pulled, the electric motor 21 is activated and the cutting tool 11 is rotated. A lock-off button 32 is provided on the upper portion of the main handle 31. By pressing the lock-off button 32, the switch lever 33 can be pulled. As a result, the unexpected start of the electric motor 21 is avoided.

As shown in FIG. 1, the handle portion 30 includes a carrying handle 34 behind the main handle 31. The carrying handle 34 has a loop shape extending in the front-rear direction and substantially in the horizontal direction in a state where the cutting machine main body 10 is moved to the lower end position. With the cutting machine main body 10 locked at the lower end position, the user can carry the desktop cutting machine 1 by grasping the carrying handle 34.

As shown in FIG. 1, the handle portion 30 includes a concave adapter mounting portion 35 behind the carrying handle 34. The communication adapter 36 can be inserted and mounted in the adapter mounting portion 35. The communication adapter 36 is capable of wireless communication with other ancillary equipment. By wireless communication, the desktop cutting machine 1 and the start-up operation and the stop operation of the ancillary equipment can be linked. With the communication adapter 36, for example, the dust collector 18 (see FIG. 2) installed separately from the desktop cutting machine 1 and the desktop cutting machine 1 can be interlocked with each other.

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

As shown in FIG. 10, the base 2 includes a horizontal plate portion 2b extending in the horizontal direction. The horizontal plate portion 2b extends toward the rotary support shaft 2a at substantially the same height as the miter scale plate 7. A sandwiching member 43 is provided on the rear side of the fixed rod 42. The sandwiching member 43 has a substantially L-shape when viewed from the left-right direction. The sandwiching member 43 is provided with a rotation shaft 43a extending in the left-right direction in the vicinity of a substantially L-shaped bent portion. The sandwiching member 43 is rotatably supported by the table extension portion 5 about the rotation shaft 43a. The sandwiching member 43 has a rod contact portion 43b capable of contacting the rear end of the fixed rod 42 at one end of the L-shape, and the sandwiching member 43 capable of contacting the lower surface of the horizontal plate portion 2b at the other end of the L-shape. It has a part 43c.

When the fixed rod 42 is displaced rearward and comes into contact with the rod contact portion 43b, the rod contact portion 43b is pushed rearward. At this time, the sandwiching member 43 rotates about the rotation shaft 43a, so that the sandwiching portion 43c is displaced upward. The upwardly displaced sandwiching portion 43c comes into contact with the lower surface of the horizontal plate portion 2b and sandwiches the horizontal plate portion 2b between the sandwiching portion 4c and the table extension portion 5. As a result, the table extension portion 5 and the sandwiching member 43 cannot move in the left-right direction with respect to the horizontal plate portion 2b. Therefore, the rotation of the table extension portion 5 and the turntable 4 integrated with the table extension portion 5 with respect to the base 2 is locked.

When the fixed rod 42 is displaced forward, the force pushing the rod contact portion 43b rearward becomes smaller (or disappears). At this time, the sandwiching member 43 rotates about the rotation shaft 43a, so that the sandwiching portion 43c is displaced downward. When the sandwiching portion 43c is displaced downward, the sandwiching member 43 and the table extension portion 5 release the sandwiching of the horizontal plate portion 2b. As a result, the table extension portion 5 and the sandwiching member 43 can move in the left-right direction with respect to the horizontal plate portion 2b. Therefore, the table extension portion 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 positive lock mechanism 45 includes a lock release lever 46 and a positioning pin 46a. The lock release lever 46 is arranged in front of the front surface of the table extension portion 5, and is arranged on the left side of the grip portion 41 and the tilt fixing operation portion 61 described later. As shown in FIG. 10, the positioning pin 46a is provided below the fixed rod 42 so as to extend in the front-rear direction along the longitudinal direction of the fixed rod 42. As shown in FIG. 10, the front portion and the rear portion of the positioning pin 46a are supported by the lower portion of the table extension portion 5. The positioning pin 46a is rotatable about its axis and can be displaced 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 front end of the positioning pin 46a is connected to the base of the unlocking lever 46. The lock release lever 46 can be operated in the vertical direction so as to rotate around the axis of the positioning pin 46a.

As shown in FIG. 2, a pin support portion 47 is attached to the lower portion of the table extension portion 5. As shown in FIG. 14, the pin support portion 47 includes an insertion hole 47a penetrating in the front-rear direction and a pair of lead surface portions 47b provided on the side of the insertion hole 47a. The pair of lead surface portions 47b are provided point-symmetrically with respect to the center of the insertion hole 47a. The lead surface portion 47b has a fan shape with the center of the insertion hole 47a as the center of the arc when viewed from the front. The lead surface portion 47b is provided on the spiral lead surface so that one end side in the circumferential direction of the fan shape is located in the front and the other end side in the circumferential direction of the fan shape is located in the rear. In the case of the left (right) lead surface portion 47b shown in FIG. 14, the fan-shaped lower (upper) end is provided on the front and the fan-shaped upper (lower) end is provided on the rear. Has been done.

As shown in FIG. 14, a pair of engaging pins 46b are provided at a substantially central portion of the positioning pin 46a in the front-rear direction. The pair of engaging pins 46b extend in directions orthogonal to the axial direction of the positioning pins 46a and in opposite directions to each other. The pair of engaging pins 46b are arranged so as to enter each of the pair of lead surface portions 47b in a state where the positioning pins 46a are passed through the insertion holes 47a. The tip of the engaging pin 46b comes into contact with the lead surface of the lead surface portion 47b.

As shown in FIG. 13, the positioning pin 46a includes a compression spring 46c on the front side of the engagement pin 46b and a washer 46d on the front side of the compression spring 46c. As shown in FIG. 10, the front surface of the washer 46d comes into contact with the spring receiving portion 5e provided at the lower part of the table extension portion 5. The spring receiving portion 5e regulates the forward movement of the front end of the compression spring 46c.

The lock release lever 46 shown in FIG. 13 is pushed downward to operate. As a result, the pair of engaging pins 46b rotate counterclockwise around the axis of the positioning pin 46a. The tip of the engaging pin 46b rotates while maintaining the contact state of the lead surface portion 47b with the lead surface. Therefore, the engaging pin 46b is displaced forward along the spiral lead surface that is inclined forward. Therefore, the positioning pin 46a, which is integrated with the engaging pin 46b, is displaced forward against the urging force of the compression spring 46c. At this time, as shown in FIG. 10, the rear end portion of the positioning pin 46a displaced forward is displaced to a position where the engagement with the positioning recess 7a can be released. Therefore, when the rotation lock state of the turntable 4 by the turntable fixing mechanism 40 is released by rotating the grip portion 41, the turntable 4 can be freely rotated in the left-right direction.

The lock release lever 46 shown in FIG. 13 is pulled upward from the lower position. As a result, the pair of engaging pins 46b rotate clockwise around the axis of the positioning pin 46a. The tip of the engaging pin 46b rotates while maintaining the contact state of the lead surface portion 47b with the lead surface. Therefore, the engaging pin 46b can be displaced rearward along the lead surface. Therefore, the positioning pin 46a, which is integrated with the engaging pin 46b, is urged by the compression spring 46 and is displaced rearward. The rear end portion of the positioning pin 46a abuts on the outer peripheral edge of the miter scale plate 7. The positioning pin 46a enters any of the positioning recesses 7a provided on the outer peripheral edge of the miter scale plate 7. Thus, the turntable 4 is positioned by the positive lock mechanism 45 at a position of a predetermined miter angle corresponding to the positioning recess 7a.

As shown in FIG. 1, a tilt fixing mechanism 60 for holding the position of the main body support arm 50 so as to be tiltable in the left-right direction is provided below the table extension portion 5. As shown in FIG. 13, the tilt fixing mechanism 60 includes a tilt fixing operation unit 61, a rotating rod 62, and a transmission shaft (tilt fixing transmission shaft) 63. The tilt fixing operation unit 61 can be rotated around an axis extending in the front-rear direction. The tilt fixing operation unit 61 has a concave-convex shape on the peripheral edge portion so that the user can easily grasp and rotate the operation unit 61. The uneven shape of the tilt fixing operation unit 61 is formed in a pattern different from the uneven shape of the grip portion 41. Therefore, since the tilt fixing operation unit 61 and the grip unit 41 can be easily distinguished when the user grips the grip, it is possible to prevent an erroneous operation such as operating the tilt fixing operation unit 61 and the grip unit 41 at the same time. A screw shaft portion 61a extending rearward is provided at the rear portion of the tilt fixing operation portion 61.

As shown in FIG. 10, the tilt fixing operation portion 61 is provided in front of the front surface of the table extension portion 5 and behind the grip portion 41. The screw shaft portion 61a is screwed with a screw hole 5d provided on the front surface of the table extension portion 5. An insertion hole 61c penetrating in the front-rear direction is provided at the center of the tilt fixing operation portion 61 and the screw shaft portion 61a. The fixing rod 42 has entered the insertion hole 61c. The tilt fixing operation unit 61 can rotate around the axis of the fixing rod 42. That is, the rotation axis of the tilt fixing operation unit 61 is coaxial with the rotation axis of the grip unit 41. The tilt fixing operation unit 61 is rotated and displaced in the front-rear direction by screwing the screw shaft portion 61a and the screw hole 5d.

As shown in FIG. 13, the rotary rod 62 extends substantially in the left-right direction, and has a rod rotation shaft 62a extending in the vertical direction substantially in the center of the left-right direction. The rod contact portion 61b at the rear end of the screw shaft portion 61a is in contact with the front surface on the left side of the rod rotation shaft 62a of the rotary rod 62. A front end portion of a transmission shaft 63 extending in the front-rear direction is connected to the left side of the rod rotation shaft 62a of the rotary rod 62. The connecting portion 63a connecting the transmission shaft 63 and the rotating rod 62 has a shaft shape extending in the vertical direction. As shown in FIG. 12, the rotary rod 62 is rotatably supported in the front-rear direction inside the table extension portion 5 via the rod rotation shaft 62a.

As shown in FIG. 12, the transmission shafts 63 are arranged side by side on the right side of the fixed rod 42. As shown in FIG. 9, the transmission shaft 63 is provided so as to extend in the front-rear direction on the left side of the right end portion of the table extension portion 5 and on the right side of the rotation support shaft 2a. As shown in FIG. 11, the rear portion of the transmission shaft 63 penetrates the arm support portion 4b and the main body support arm 50. A screw shaft portion 63b is provided at the rear end portion of the transmission shaft 63 protruding rearward from the arcuate hole 50b of the main body support arm 50. A nut 64 is fastened to the screw shaft portion 63b. A washer 64a is interposed between the nut 64 and the rear surface of the main body support arm 50.

As shown in FIG. 13, when the tilt fixing operation portion 61 is displaced rearward, the portion of the rotating rod 62 on the left side of the rod rotating shaft 62a is pushed by the rod contact portion 61b and displaced rearward. Since the rotating rod 62 rotates around the axis of the rod rotating shaft 62a, the portion of the rotating rod 62 on the right side of the rod rotating shaft 62a is pulled forward. Therefore, the transmission shaft 63 connected to the right side portion of the rotating rod 62 is pulled forward. As shown in FIG. 11, the nut 64 is pulled forward by the transmission shaft 63. As a result, the front portion of the main body support arm 50 is pressed against the rear portion of the arm support portion 4b. Thus, the main body support arm 50 is fixed to the arm support portion 4b and positioned at a predetermined left-right tilt angle.

As shown in FIG. 13, when the tilt fixing operation portion 61 is displaced forward, the pressing force of the rod contact portion 61b that presses the left side portion of the rotating rod 62 rearward from the rod rotating shaft 62a is released. As a result, the forward pulling force is released at the portion of the rotating rod 62 on the right side of the rod rotating shaft 62a. Therefore, as shown in FIG. 11, the forward pulling force on the transmission shaft 63 and the nut 64 is also released, so that the pressing force for pressing the main body support arm 50 against the arm support portion 4b is released. Thus, the main body support arm 50 can be tilted left and right with respect to the arm support portion 4b around the axis of the left-right tilt support shaft 50a (see FIG. 10). When the main body support arm 50 tilts left and right, the arc-shaped hole 50b is displaced around the axis of the left and right tilt support shaft 50a with respect to the rear end portion of the transmission shaft 63, whereby the transmission projecting rearward from the main body support arm 50. It is possible to prevent the shaft 63 from hindering the left-right tilt of the main body support arm 50.

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

Therefore, the grip portion 41 and the tilt fixing operation portion 61 are located in front of the desktop cutting machine 1 and are easy to operate by a user who works. That is, it is possible to improve the operability of the tilt fixing operation unit 61 while maintaining high operability of the grip unit 41. Further, the grip portion 41, which is operated more frequently, is provided in front of the tilt fixing operation portion 61, and is closer to the user located in front of the desktop cutting machine 1. Therefore, it is possible to prevent the tilt fixing operation unit 61 from being mistakenly operated as the grip unit 41. Further, the grip portion 41 also functions as an operation portion gripped by the user when the turntable 4 is rotated horizontally. In this case, since the grip portion 41 is located at a position farther from the rotation support shaft 2a, it is easy to grip the grip portion 41 and rotate the turntable 4.

Further, according to the tabletop cutting machine 1, the tilt fixing mechanism 60 includes a transmission shaft 63 extending in the front-rear direction from the front portion of the table extension portion 5 to the main body support arm 50. The transmission shaft 63 is provided between the rotary support shaft 2a and the right end portion of the table extension portion 5.

Therefore, the transmission shaft 63 can be provided in the vacant space below the turntable 4 and the table extension portion 5 while avoiding the rotary support shaft 2a. Therefore, the axial force transmitted to the transmission shaft 63 is not easily hindered, and the operating force of the tilt fixing operation unit 61 can be easily transmitted to the main body support arm 50.

Further, according to the desktop cutting machine 1, a positive lock mechanism 45 for positioning the turntable 4 at a predetermined rotation angle is provided. The transmission shaft 63 extends in the front-rear direction alongside the right side of the fixed rod 42. The positioning pin 46a of the positive lock mechanism 45 is located below the fixing rod 42.

Therefore, the fixed rod 42, the transmission shaft 63, and the positioning pin 46a are arranged in a substantially right-angled triangular shape when viewed from the front. As a result, the turntable fixing mechanism 40 and the tilt fixing mechanism 60 can be compactly arranged in the vertical direction. Further, the positioning pin 46a of the positive lock mechanism 45 can be arranged below the fixed rod 42 that has been made compact in the vertical direction. Thus, the turntable fixing mechanism 40, the tilt fixing mechanism 60, and the positive lock mechanism 45 can be arranged in a minimum space below the upper surface of the table extension portion 5 while maintaining operability.

Further, according to the tabletop cutting machine 1, the tilt fixing mechanism 60 includes a rotating rod 62 inside the table extension portion 5. The rotary rod 62 is rotatable in the front-rear direction, the left side portion can be in contact with the rod contact portion 61b of the tilt fixing operation portion 61, and the right side portion is connected to the transmission shaft 63 via the connecting portion 63a. Has been done. The tilt fixing operation unit 61 is provided with a screw shaft portion 61a at the rear portion that displaces the tilt fixing operation unit 61 that has been rotated in the front-rear direction. By pushing the tilt fixing operation portion 61 backward by the screw shaft portion 61a, the rotary rod 62 rotates around the axis of the rod rotary shaft 62a, and the left side portion of the rotary rod 62 that comes into contact with the rod contact portion 61b moves backward. Be pushed. As a result, the right side portion of the rotating rod 62 generates a forward pulling force on the transmission shaft 63. The main body support arm 50 pulled forward by the pulling force is pressed and fixed to the rear surface of the arm support portion 4b of the turntable 4.

Therefore, the tilt fixing mechanism 60 can be simply configured with a relatively small number of parts such as a tilt fixing operation unit 61, a rotating rod 62, and a transmission shaft 63. As a result, the tilt fixing mechanism 60 can be provided compactly. Further, the tilt fixing mechanism 60 can be easily maintained or maintenance-free, and it is easy to maintain the operability of the tilt fixing operation unit 61.

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

As shown in FIG. 16, a blade edge plate 71a is provided on the upper surface of the table extension portion 71. A notch-shaped groove 71b is provided in the center of the cutting edge plate 71a. A turntable fixing mechanism 40, a positive lock mechanism 75, and a tilt fixing mechanism 80 are provided below the table extension portion 71. As shown in FIG. 15, the positive lock mechanism 75 includes a lock release lever 76 and a positioning pin 76a. The lock release lever 76 is arranged in front of the front surface of the table extension portion 71, and is arranged on the left side of the grip portion 41 and the tilt fixing operation portion 81 described later. The unlock lever 76 is integrally connected to the front end of the positioning pin 76a. The lock release lever 76 can be operated in the vertical direction so as to rotate around the axis of the positioning pin 76a. As shown in FIG. 16, the positioning pin 76a is provided below the fixed rod 42, and extends in the front-rear direction at substantially the same height as the miter scale plate 7. The positioning pin 76a is supported by the lower part of the table extension portion 71 and can be displaced in the front-rear direction. A flange portion 76c projecting in the radial direction is provided on the front portion of the positioning pin 76a. The table extension portion 71 has a spring receiving portion 71c on the front side of the flange portion 76c. A compression spring 76b is provided between the flange portion 76c and the spring receiving portion 71c. The positioning pin 76a is urged rearward by the compression spring 76b.

As shown in FIG. 15, a lever guide portion 71d is provided below the table extension portion 71. The lever guide portion 71d has an inclined surface that inclines from the front to the rear from the left end side of the table extension portion 71 toward the center. The lock release lever 76 is operated in the vertical direction while being in contact with the inclined surface of the lever guide portion 71d. When the lock release lever 76 is pushed downward, it is displaced forward along the inclined surface of the lever guide portion 71d. As a result, the positioning pin 76a integrated with the lock release lever 76 is displaced forward against the urging force of the compression spring 76b. 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 disengaged. When the lock release lever 76 is pulled upward, it is displaced rearward along the inclined surface of the lever guide portion 71d. The positioning pin 76a, together with the lever guide portion 71d, is displaced rearward by the urging force of the compression spring 76b. Therefore, the rear end portion of the positioning pin 76a is displaced to a position where it can be engaged with the positioning recess 7a.

As shown in FIG. 15, the tilt fixing mechanism 80 includes a tilt fixing operation unit 81, a reduction gear unit 82, and a transmission shaft (tilt fixing transmission shaft) 83. The tilt fixing operation unit 81 can be rotated around an axis extending in the front-rear direction. The tilt fixing operation portion 81 is provided in front of the front surface of the table extension portion 71 and behind the grip portion 41. A drive side gear 82a of the reduction gear portion 82 is integrally provided at the rear portion of the tilt fixing operation portion 81. As shown in FIG. 16, an insertion hole 81a penetrating in the front-rear direction is provided at the center of the tilt fixing operation unit 81 and the drive side gear 82a. The fixing rod 42 has entered the insertion hole 81a. The tilt fixing operation unit 81 and the drive side gear 82a can rotate around the axis of the fixing rod 42. That is, the rotation axis of the tilt fixing operation unit 81 is coaxial with the rotation axis of the grip unit 41.

As shown in FIG. 15, the reduction gear portion 82 includes a drive side gear 82a and a driven side gear 82b. The driven side gear 82b is provided at the front end of the transmission shaft 83 extending in the front-rear direction. The driven side gear 82b can rotate around the transmission shaft 83. As shown in FIG. 18, the driven side gear 82b is aligned on the right side of the driving side gear 82a and is meshed with the driving side gear 82a. The rotation of the drive side gear 82a is decelerated and transmitted to the driven side gear 82b. The reduction ratio of the drive side gear 82a and the driven side gear 82b is, for example, 1: 1.5. The transmission shafts 83 are arranged side by side on the right side of the fixed rod 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 portion 71 and on the right side of the rotation support shaft 2a. As shown in FIG. 17, the rear portion of the transmission shaft 83 penetrates the arm support portion 4b and the main body support arm 72. A screw shaft portion 83a is provided at the rear end portion of the transmission shaft 83 protruding rearward from the main body support arm 72. A nut 84 is attached to the screw shaft portion 83a. A substantially flat two-sided width portion 84a provided at positions facing each other is formed at the front portion of the nut 84 having a cylindrical cross section.

As shown in FIG. 16, the main body support arm 72 is supported so as to be tiltable in the left-right direction with respect to the arm support portion 4b with respect to the left-right tilt support shaft 72a extending in the front-rear direction. As shown in FIG. 19, an arc-shaped hole 72b and a detent hole 72c are provided in the lower portion of the main body support arm 72. The arc-shaped hole 72b is an arc-shaped hole that penetrates in the front-rear direction about the left-right tilting support shaft 72a. The detent hole 72c is provided on the front side of the arc-shaped hole 72b, and is formed along the arc-shaped hole 72b. The detent hole 72c is provided with a length in the width direction (diameter direction centered on the left / right tilting support shaft 72a) smaller than that of the arcuate hole 72b. As shown in FIG. 17, the shaft portion (front portion) of the nut 84 can enter the arcuate hole 72b. The detent hole 72c can enter only the width across flats 84a. The rotation of the nut 84 is regulated by the width across flats 84a and the detent hole 72c.

As shown in FIG. 15, when the tilt fixing operation unit 81 is rotated, the transmission shaft 83 is decelerated via the reduction gear unit 82 and rotates about the axis. As shown in FIG. 17, the nut 84 attached to the screw shaft portion 83a is restricted from rotating around the transmission shaft 83. Therefore, when the transmission shaft 83 is rotated in one direction, the nut 84 is fastened to the screw shaft portion 83a. As a result, the main body support arm 72 is pressed toward the arm support portion 4b. Thus, the main body support arm 72 is fixed to the arm support portion 4b and is positioned at a predetermined left-right tilt angle. When the transmission shaft 83 is rotated in the opposite direction, the nut 84 and the screw shaft portion 83a are loosened. As a result, the pressing force that presses the main body support arm 72 toward the arm support portion 4b is released. Thus, the main body support arm 72 can be tilted left and right with respect to the arm support portion 4b around the axis of the left-right tilt support shaft 72a (see FIG. 16).

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

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

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

As shown in FIG. 20, the turntable 91 has a table extension portion 92 extending along the blade surface direction of the cutting tool 11 (see FIG. 1). A blade edge plate 92a is provided on the upper surface of the table extension portion 92. As shown in FIG. 23, a turntable fixing mechanism 40, a positive lock mechanism 45, and a tilt fixing mechanism 100 are provided below the table extension portion 92. A spring receiving portion 92b projecting downward is provided below the table extension portion 92. The spring receiving portion 92b regulates the forward movement of the washer 46d urged forward by the compression spring 46c of the positive lock mechanism 45.

As shown in FIG. 20, the turntable 91 has an arm support portion 91b behind the horizontal table upper surface 91a. A circular insertion hole 91c penetrating in the front-rear direction is provided in 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 so as to be tiltable in the left-right direction with respect to the arm support portion 91b around the left-right tilt support shaft 94a (see FIG. 26). As shown in FIG. 26, the main body support arm 94 has an arcuate arc-shaped hole 94b that penetrates in the front-rear direction about the left-right tilt support shaft 94a.

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 unit 101 can be rotated around an axis extending in the front-rear direction. As shown in FIG. 25, the tilt table extension portion 92 is provided with an insertion hole 92c extending in the front-rear direction. The shaft portion of the tilt fixing operation portion 101 enters the insertion hole 92c and is rotatably supported around the shaft.

As shown in FIG. 23, the tilt fixing operation portion 101 is provided in front of the front surface of the table extension portion 92 and behind 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 drive side gear 102a and a driven side gear 102b. The drive side gear 102a is provided integrally with the rear portion of the tilt fixing operation unit 101. As shown in FIG. 25, an insertion hole 101a is provided at the center of the tilt fixing operation unit 101 and the drive side gear 102a so as to penetrate in the front-rear direction and allow the fixing rod 42 to enter. The tilt fixing operation unit 101 and the drive side gear 102a can rotate around the axis of the fixing rod 42. That is, the rotation axis of the tilt fixing operation unit 101 is coaxial with the rotation axis of the grip unit 41 (see FIG. 23).

As shown in FIG. 23, the driven side gear 102b is provided at the front end of the transmission shaft 103 extending in the front-rear direction. The driven side gear 102b can rotate around the transmission shaft 103. The driven side gear 102b is aligned on the right side of the driving side gear 102a and is meshed with the driving side gear 102a. The rotation of the drive side gear 102a is decelerated and transmitted to the driven side gear 102b. The reduction ratio of the drive 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 rod 42 and on the left side of the right end portion of the table extension portion 92.

As shown in FIG. 24, a front cover 93 is attached to the lower part of the table extension portion 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 portion 92 has a U-shaped groove extending in the front-rear direction and opening downward. The front portion of the transmission shaft 103 is rotatably supported around the axis by being sandwiched between a pair of U-shaped grooves of the front cover 93 and the table extension portion 92 from both the upper and lower sides.

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

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

As shown in FIGS. 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 the outer peripheral side surface of the fan-shaped nut 106. An inner peripheral portion 106b extending in an arc shape is provided on the inner peripheral side surface of the fan-shaped nut 106. The outer peripheral portion 106a and the inner peripheral portion 106b each extend with the left-right tilting support shaft 94a as the center of the arc.

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

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

As shown in FIGS. 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 portion of the tilt fixing mechanism 100 from the outside. As a result, it is possible to prevent chips and the like 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 and rotates about the axis. The nut 106 attached to the rear end of the transmission shaft 103 is restricted from rotating around the transmission shaft 103. Therefore, when the transmission shaft 103 is rotated in one direction, the nut 106 is fastened to the transmission shaft 103. As a result, an axial force in the extending direction of the transmission shaft 103 is generated between the thrust needle bearing 104 and the nut 106. The thrust needle bearing 104 and the nut 106 press the arm support portion 91b and the main body support arm 94 from both front and rear sides by an axial force. Thus, the main body support arm 94 is fixed to the arm support portion 91b and is positioned at a predetermined left-right tilt angle. When the transmission shaft 103 is rotated in the opposite direction, the nut 106 is loosened with respect to the transmission shaft 103. As a result, the axial force between the thrust needle bearing 104 and the nut 106 is released. Thus, the main body support arm 94 can be tilted left and right with respect to the arm support portion 91b around the axis of the left-right tilt support shaft 94a (see FIG. 26).

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

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

Further, according to the desktop cutting machine 90, the main body support arm 94 can be tilted in the left-right direction about the left-right tilt support shaft 94a. The nut 106 has a fan shape that matches the arc shape centered on the left-right tilting support shaft 94a. Therefore, the nut 106 can smoothly move relative to the main body support arm 94 in an arc shape about the left-right tilt support shaft 94a. Therefore, the main body support arm 94 can be smoothly tilted to the left or right. Further, the nut 106 can regulate the rotation of the transmission shaft 103 around the axis by abutting the inner peripheral portion 106b and the inner peripheral wall 94c of the main body support arm 94. Therefore, a large axial force can be received by the nut 106. As a result, the main body support arm 94 can be fixed to the arm support portion 91b with a large axial force.

Further, according to the desktop cutting machine 90, a rear cover 108 is provided behind the main body support arm 94. Therefore, the intrusion of chips and the like can be prevented by covering the periphery of the transmission shaft 103 and the like with the rear cover 108. As a result, the loss of axial force due to the presence of chips and the like can be suppressed. As a result, the main body support arm 94 can be fixed with a large axial force. Further, by preventing the intrusion of chips and the like, the main body support arm 94 can be smoothly tilted to the left and right.

Further, according to the desktop cutting machine 90, a front cover 93 is provided on the bottom surface of the reduction gear portion 102. Therefore, it is possible to prevent chips and the like from entering the reduction gear portion 102. Therefore, the rotation of the tilt fixing operation unit 101 can be more reliably transmitted to the rear portion of the transmission shaft 103. As a result, the fixing operation of the main body support arm 94 becomes smooth.

[Other variants]
Various changes can be made to the desktop cutting machines 1, 70, 90 of each of the above-described embodiments. Although the case where the rod rotating shaft 62a is provided substantially in the center of the rotating rod 62 in the left-right direction has been illustrated, for example, the rod rotating shaft 62a may be provided at a position closer to the connecting portion 63a in order to utilize the principle of leverage. With such a 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 rod contact portion 61b of the tilt fixing operation portion 61 pushes the rotating rod 62 backward. it can. The transmission shaft 63 may be provided on the right side of the left end portion of the table extension portion 5 and on the left side of the rotary support shaft 2a. Although the case where the transmission shafts 63 and 83 are provided at substantially the same height has been illustrated, for example, the transmission shafts 63 and 83 may be arranged below each embodiment. With this configuration, the triangles of the fixed rod 42, the transmission shafts 63, 83, and the positioning pins 46a, 76a seen from the front side can be set smaller, and the table extension portion can be made compact in the vertical and horizontal directions. Further, the reduction ratio of the reduction gear portion 82 can be set larger.

As the tabletop cutting machines 1, 70, 90, a slide circular saw having both slide operation and vertical swing operation functions has been illustrated, but for example, it is also applicable to a desktop circular saw that cannot slide operation and can only perform vertical swing operation. Can be done.

1 ... Desktop cutting machine (first embodiment)
2 ... Base, 2a ... Rotating support shaft, 2b ... Horizontal plate part 3 ... Auxiliary table part 4 ... Turn table, 4a ... Table top surface, 4b ... Arm support part 5 ... Table extension part, 5a ... Cutting edge plate, 5b ... Groove Holes, 5c, 5d ... Screw holes 5e ... Spring receiving part,
6 ... Positioning fence, 6a ... Positioning surface, 6b ... Fence base 7 ... Miter scale plate, 7a ... Positioning recess, 7b ... Fixing screw 10 ... Cutting machine body 10a ... Vertical swing support shaft 11 ... Cutting tool, 12 ... Fixed cover, 13 ... Movable cover, 14 ... Main body support 15 ... Dust collection guide, 16 ... Rear dust collection ports 17, 17a, 17b ... Dust collector hose 18 ... Dust collector 20 ... Motor housing, 20a ... Intake port, 21 ... Electric Motor 25 ... Battery mounting part, 26 ... Battery 30 ... Handle part, 31 ... Main handle, 32 ... Lockoff button 33 ... Switch lever, 34 ... Carrying handle 35 ... Adapter mounting part, 36 ... Communication adapter 40 ... Turntable fixing mechanism 41 ... Grip part (turntable fixing operation part)
42 ... Fixed rod (turntable fixing member)
43 ... sandwiching member, 43a ... rotating shaft, 43b ... rod contact portion, 43c ... sandwiching portion 45 ... positive lock mechanism 46 ... unlocking lever, 46a ... positioning pin, 46b ... engaging pin 46c ... compression spring, 46d ... washer 47 ... Pin support part, 47a ... Insertion hole, 47b ... Lead surface part 48 ... Adjust bolt 50 ... Main body support arm (main body tilting part), 50a ... Left and right tilting support shaft, 50b ... Arc-shaped hole 51 ... Slide bar 52 ... Maximum tilt angle Switching lever 60 ... Tilt fixing mechanism 61 ... Tilt fixing operation part, 61a ... Screw shaft part, 61b ... Rod contact part, 61c ... Insertion hole 62 ... Rotating rod, 62a ... Rod rotating shaft 63 ... Transmission shaft (tilting fixing transmission shaft) ), 63a ... Connecting portion, 63b ... Screw shaft portion 64 ... Nut, 64a ... Washer 70 ... Desktop cutting machine (second embodiment)
71 ... Table extension, 71a ... Cutting edge plate, 71b ... Groove hole, 71c ... Spring receiving part 71d ... Lever guide 72 ... Main body support arm (main body tilting part), 72a ... Left and right tilting support shaft, 72b ... Arc-shaped hole 72c ... Anti-rotation hole 75 ... Positive lock mechanism 76 ... Unlocking lever 76a ... Positioning pin, 76b ... Compression spring, 76c ... Flange part 80 ... Tilt fixing mechanism 81 ... Tilt fixing operation part, 81a ... Insertion hole 82 ... Reduction gear part, 82a ... Drive side gear, 82b ... Driven side gear 83 ... Transmission shaft (tilt fixed transmission shaft), 83a ... Screw shaft portion 84 ... Nut, 84a ... Width across flats 90 ... Desktop cutting machine (third embodiment)
91 ... Turntable, 91a ... Table top surface, 91b ... Arm support, 91c ... Insertion hole 92 ... Table extension, 92a ... Cutting edge plate, 92b ... Spring receiving part, 92c ... Insertion hole 93 ... Front cover 94 ... Main body Support arm (main body tilting part), 94a ... Left and right tilting support shaft, 94b ... Arc-shaped hole 94c ... Inner peripheral wall 100 ... Tilt fixing mechanism 101 ... Tilt fixing operation part, 101a ... Insertion hole 102 ... Reduction gear part, 102a ... Drive side gear , 102b ... Driven side gear 103 ... Transmission shaft (tilt fixed transmission shaft)
104 ... Thrust needle bearing (support part)
104a ... Cage, 104b ... Washer 104c ... Needle 105 ... Receiving part (support part)
106 ... nut, 106a ... outer circumference, 106b ... inner circumference, 106c ... screw 106d ... washer 107 ... sleeve 108 ... rear cover

Claims (10)

It ’s a desktop cutting machine.
The base, a turntable rotatably supported on the base, a cutting machine main body provided above the turntable to rotatably support the cutting tool, and the turntable fixed to the base. It is possible to fix the turntable fixing mechanism, the main body tilting portion provided behind the turntable and supporting the cutting machine main body so as to be tiltable in the left-right direction, and the left-right tilting of the cutting machine main body. Equipped with a tilt fixing mechanism,
The turntable fixing mechanism includes a turntable fixing operation unit that can be rotated and a turntable fixing member that can fix the turntable to the base by rotating the turntable fixing operation unit. ,
The turntable fixing operation unit is arranged in front of the front surface of the turntable, below the upper surface of the turntable, and in the center of the turntable in the left-right direction.
The tilt fixing mechanism includes a tilt fixing operation unit that can be rotated.
The rotation axis of the tilt fixing operation unit is provided coaxially with the rotation axis of the turntable fixing operation unit.
The tilt fixing operation unit is a desktop cutting machine provided in front of the front surface of the turntable and behind the turntable fixing operation unit. The desktop cutting machine according to claim 1.
The tilt fixing mechanism includes a tilt fixing transmission shaft extending in the front-rear direction from the front portion of the turntable to the tilt portion of the main body.
The tilt fixed transmission shaft is a tabletop cutting machine provided between the center of rotation of the turntable and the left end, or between the center of rotation of the turntable and the right end. The desktop cutting machine according to claim 2.
It is equipped with a positive lock mechanism that positions the turntable at a predetermined rotation angle.
The tilt fixing transmission shafts are arranged side by side with respect to the turntable fixing member.
The positive lock mechanism is a tabletop cutting machine located below the turntable fixing member. The desktop cutting machine according to claim 2 or 3.
The tilt fixing mechanism includes a rotary rod that is rotatable in the front-rear direction, one side is capable of contacting the tilt fixing operation unit, and the other side is connected to the tilt fixing transmission shaft.
The tilt fixing operation unit includes a screw shaft portion that displaces the tilt fixing operation unit that has been rotated in the front-rear direction.
By displacing the tilt fixing operation portion backward by the screw shaft portion, the rotating rod in contact with the tilt fixing operation portion rotates to generate a forward pulling force on the tilt fixing transmission shaft, and the tension is generated. A desktop cutting machine having a structure in which the tilting portion of the main body is pressed against the turntable by force and fixed. The desktop cutting machine according to claim 2 or 3.
The tilt fixing mechanism includes a reduction gear portion composed of a drive side gear provided in the tilt fixing operation unit and a driven side gear provided in the tilt fixing transmission shaft.
A screw shaft portion is provided at the rear portion of the tilt fixed transmission shaft, and a nut is attached to the screw shaft portion.
By rotating the tilt fixing operation portion, the tilt fixing transmission shaft is rotated around the axis via the reduction gear portion, and by tightening the screw shaft portion and the nut, the body tilt portion is moved. A desktop cutting machine having a configuration in which it is pressed and fixed to the turntable. The desktop cutting machine according to claim 5.
It has a support portion that supports the tilt fixed transmission shaft with respect to the turntable.
A desktop cutting machine having a configuration in which the main body tilting portion is fixed by sandwiching the main body tilting portion and the turntable between the support portion and the nut. The desktop cutting machine according to claim 6.
A desktop cutting machine in which a thrust needle bearing is provided on the support portion. The desktop cutting machine according to claim 6 or 7.
The main body tilting portion can be tilted in the left-right direction around the left-right tilting support axis.
The nut is a desktop cutting machine having a fan shape that matches the arc shape centered on the left-right tilting support shaft. The desktop cutting machine according to any one of claims 6 to 8.
A desktop cutting machine in which a rear cover is provided behind the tilting portion of the main body. The desktop cutting machine according to any one of claims 6 to 9.
A desktop cutting machine in which a front cover is provided on the bottom surface of the reduction gear portion.

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