JP2018039095A - Portable cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular saw capable of suppressing scattering of chips. A dustproof circular saw 1 has a circular saw main body 20 for rotating a disk-shaped cutting tool 22, and a fixed cover 21 fixed to the circular saw main body 20 so as to cover a part of the outer periphery of the disk-shaped cutting tool 22. The base 10 supports the circular saw main body 20 upward so that the angle can be adjusted in the vertical direction, and supports the circular saw main body 20 so that the angle can be adjusted in the horizontal direction. The auxiliary cover 9 covers the outer circumference of the disc-shaped cutting tool 22 in the gap S between the fixed cover 21 and the base 10 in the vicinity of the vertical swing support shaft 15 of the circular saw main body 20. The auxiliary cover vertical movement mechanism 25 moves the auxiliary cover 9 with respect to the circular saw body 20 according to the vertical angle of the circular saw body 20. The left-right tilt support shaft 13 rotatably connects the auxiliary cover 9 to the base 10 in the left-right direction. The interlocking mechanism 26 rotates the auxiliary cover 9 in the left-right direction around the center of the left-right tilt support shaft 13 according to the angle in the left-right direction of the circular saw body 20. [Selection diagram] Fig. 2

Description

  The present invention relates to a portable cutting machine such as a portable circular saw, for example, a dustproof circular saw provided with a dust box for storing chips.

  The portable circular saw disclosed in Patent Documents 1 and 2 covers a circular saw body having a motor for rotating the disk-shaped blade, a rectangular base that supports the circular saw body, and an outer peripheral surface of the disk-shaped blade. It has a fixed cover fixed to the circular saw body. The front end of the circular saw body is swingably attached to the base, and the swing angle can be adjusted in the vertical direction with respect to the base. Thereby, the protrusion amount from the base of the disk-shaped cutting tool can be set.

  A dust cover is rotatably attached to the circular saw body of Patent Document 1 so as to have the same rotation center as the disk-shaped cutting tool. The dust cover is positioned so as to cover the gap between the fixed cover and the base in the vicinity of the swing fulcrum of the circular saw body. Although the distance between the fixed cover and the base changes by swinging the circular saw body up and down relative to the base, the dust cover rotates relative to the fixed cover in conjunction with the swing of the circular saw body. Thereby, the dust cover can reliably cover the gap between the fixed cover and the base regardless of the swing angle of the circular saw body. As a result, it is possible to effectively prevent chips from blowing out from the gap between the fixed cover and the base.

  A slide cover is attached to the front end of the fixed cover of Patent Document 2 so as to be slidable in the vertical direction. Although the distance between the fixed cover and the base changes by swinging the circular saw body up and down with respect to the base, the slide cover moves up and down with respect to the fixed cover. Therefore, the slide cover can cover the gap between the fixed cover and the base regardless of the vertical swing angle of the circular saw body.

JP 2000-37705 A JP 2002-18811 A

  In the circular saw body, not only the swing angle is set in the vertical direction with respect to the base, but also the tilt angle may be set in the left-right direction. There has been a need for a structure that can effectively suppress the scattering of chips even in such a case.

  In one aspect, a portable cutting machine according to the present invention includes a cutting machine body having a motor for rotating a disk-shaped cutting tool, and a fixed cover fixed to the cutting machine body so as to cover a part of the outer periphery of the disk-shaped cutting tool. Have. The base supports the cutting machine main body so that the angle can be adjusted in the vertical direction upward and downward, and adjusts the downward projection amount of the disk-shaped cutting tool, and supports the cutting machine main body so that the angle can be adjusted in the left-right direction. The inclination angle of the rotation center axis can be adjusted. The auxiliary cover covers the outer periphery of the disk-shaped cutting tool in the gap between the fixed cover and the base in the vicinity of the center of swinging in the vertical direction of the cutting machine body. The auxiliary cover up / down movement mechanism moves the auxiliary cover relative to the cutting machine main body according to the vertical angle of the cutting machine main body. The left / right tilt support shaft connects the auxiliary cover to the base so as to be rotatable in the left / right direction. The interlocking mechanism rotates the auxiliary cover in the left-right direction about the left-right tilt support shaft according to the angle in the left-right direction of the cutting machine body.

  Therefore, the auxiliary cover follows the angle of the cutting machine body not only when the cutting machine body is moved vertically with respect to the base but also when the cutting machine body is tilted in the left-right direction. Although the shape of the gap between the fixed cover and the base changes according to the vertical and horizontal angles of the circular saw body 20, the auxiliary cover 9 moves corresponding to the change in the shape of the gap S. For this reason, the auxiliary cover can reduce the amount of chips scattered from the gap between the fixed cover and the base.

  In another aspect, the portable cutting machine according to the present invention includes a cutting machine body having a motor for rotating the disk-shaped cutting tool, and a fixed cover fixed to the cutting machine body so as to cover a part of the outer periphery of the disk-shaped cutting tool. Have. The base supports the cutting machine main body so that the angle can be adjusted in the vertical direction upward and downward, and adjusts the downward projection amount of the disk-shaped cutting tool, and supports the cutting machine main body so that the angle can be adjusted in the left-right direction. The inclination angle of the rotation center axis can be adjusted. The portable cutting machine also has an auxiliary cover and an auxiliary cover vertical movement mechanism. The auxiliary cover is movably attached to the fixed cover so as to cover the outer periphery of the disk-shaped cutting tool in the gap between the fixed cover and the base in the vicinity of the swing center in the vertical direction of the cutting machine body. The auxiliary cover up / down moving mechanism moves the auxiliary cover relative to the fixed cover according to the vertical angle of the cutting machine body.

  Therefore, the auxiliary cover moves relative to the fixed cover by adjusting the angle of the cutting machine body in the vertical direction with respect to the base. When the cutting machine body fixing cover is tilted in the left-right direction, the auxiliary cover is tilted in the left-right direction together with the fixing cover because the auxiliary cover is attached to the fixing cover. Therefore, although the shape of the gap between the fixed cover and the base changes depending on the angle of the cutting machine body, the auxiliary cover moves corresponding to the shape of the gap. Thereby, the auxiliary cover can suppress the scattering of chips from the gap between the fixed cover and the base.

  In another aspect, a portable cutting machine according to the present invention includes a cutting machine body provided with a motor for rotating the disk-shaped cutting tool, and a cover body attached to the cutting machine body so as to cover the outer periphery of the disk-shaped cutting tool. The base supports the cutting machine main body so that the angle can be adjusted in the vertical direction upward and downward, and adjusts the downward projection amount of the disk-shaped cutting tool, and supports the cutting machine main body so that the angle can be adjusted in the left-right direction. The tilt angle in the left-right direction can be adjusted. The cover body tilts in the left-right direction together with the cutting machine body. A part of the cover body moves vertically relative to the cutting machine body in conjunction with the vertical swing of the cutting machine body so as to reduce the gap between the cover body and the base in the vicinity of the vertical swing center of the cutting machine body. Move in the direction.

  Therefore, by adjusting the angle of the cutting machine main body in the vertical direction with respect to the base, a part of the cover body moves in the vertical direction with respect to the cutting machine main body. When the cutting machine body is tilted in the left-right direction, the cover body is tilted together with the cutting machine body because it is attached to the cutting machine body. Therefore, although the shape of the gap between the cover body and the base may change depending on the angle of the cutting machine body, the position and angle of a part of the cover body change according to the angle of the cutting machine body. Thereby, the clearance gap between a cover body and a base can be made small, and scattering of a chip can be suppressed reliably.

It is a right view of a portable circular saw. It is a partially broken right view of a portable circular saw. It is a partially broken right side view of the portable circular saw when the circular saw body is located at the upper position. It is a top view of a portable circular saw. It is a cross-sectional view of a portable circular saw. It is a front view of a portable circular saw. It is a partially broken front view of a portable circular saw. It is a front view of a portable circular saw when the circular saw body is positioned in an inclined posture. It is a partially broken front view of a portable circular saw when the circular saw body is positioned in an inclined posture. It is a rear view of a portable circular saw. It is a bottom view of a portable circular saw. It is a perspective view of a dust cover and an angular guide. It is a right view of a dust cover and an angular guide. It is a front view of a dust cover and an angular guide. It is a partial cross-sectional top view of a dust cover and an angular guide. It is a partial perspective view of the portable circular saw in the vicinity of the ruler fixing device. It is the XVII-XVII sectional view taken on the line of FIG. FIG. 5 is a cross-sectional view taken along line XVIII-XVIII in FIG. 4. It is a partial cross section right view of the part of a ruler fixing device. It is a bottom view of the parts of a ruler fixing device. It is a perspective view of a hole member. It is a top view of a hole member. It is an expanded view of the hole member in the XXIII line of FIG. It is an expanded view of the hole member in the XXIV line of FIG. It is a front view of a pressing member. It is a right view of a dustproof circular saw. It is a partially broken right side view of a dustproof circular saw. It is a partially broken right side view of the dustproof circular saw when the circular saw body is located at the upper position. It is a top view of a dustproof circular saw. It is a cross-sectional view of a dustproof circular saw. It is a front view of a dustproof circular saw. It is a partially broken front view of a dustproof circular saw. It is a front view of a dustproof circular saw when a circular saw body is located in an inclined posture. It is a partially broken front view of a dustproof circular saw when the circular saw body is positioned in an inclined posture. It is a rear view of a dustproof circular saw. It is a bottom view of a dustproof circular saw. It is a perspective view of a dust cover and an angular guide. It is a right view of a dust cover and an angular guide. It is a front view of a dust cover and an angular guide. It is a partial cross-sectional top view of a dust cover and an angular guide. It is a disassembled perspective view of a blower mechanism. It is a disassembled front view of a blower mechanism. It is a decomposition | disassembly right view of a blower mechanism. It is an exploded bottom view of a blower mechanism. It is a right view of a dust box. It is a longitudinal cross-sectional view of a dust box. It is a top view of a dust box.

  An embodiment of the present invention will be described with reference to the drawings. 1 and 4 show a dust-proof circular saw (portable circular saw) 1 which is an example of a portable processing machine or a portable cutting machine that a user carries and moves. This product is mainly used for cutting siding and masonry boards, and is also called a dust collection circular saw. Below, the dustproof circular saw 1 is demonstrated using the front-back direction, the left-right direction, and an up-down direction. The front corresponds to the direction in which the dustproof circular saw 1 is advanced when the workpiece W is cut or processed by the dustproof circular saw 1. The user is located behind the dust-proof circular saw 1, and the left-right direction is determined based on the user.

  As shown in FIG. 1, the dustproof circular saw 1 has a circular saw main body (processing machine main body, cutting machine main body) 20 and a base 10 that supports the circular saw main body 20 so that the angle can be adjusted. As shown in FIGS. 4 and 5, the circular saw body 20 includes an electric motor 30 that rotates a disk-shaped blade (saw blade) 22, and a battery 2 that supplies electric power to the electric motor 30.

  As shown in FIGS. 4 and 5, the electric motor 30 is a brushless motor and is accommodated in the motor housing 4. The electric motor 30 includes a stator 30a that is fixed to the inner peripheral surface of the motor housing 4, and a rotor 30b that is rotatably supported on the inner peripheral side of the stator 30a. A sensor substrate 34 having a magnetic sensor for detecting the rotational position of the rotor 30b is attached to the right side (lower side in FIG. 5) of the stator 30a. The motor shaft 30c is inserted through the rotor 30b, and the rotor 30b is fixed to the motor shaft 30c. The left end of the motor shaft 30c is supported on the motor housing 4 by a bearing 33 so as to be rotatable around the shaft. The right end of the motor shaft 30c is supported by the gear housing 5 by a bearing 32 so as to be rotatable around the shaft.

  As shown in FIG. 5, the gear housing 5 is provided on the right side of the motor housing 4. A reduction gear mechanism 40 that reduces the rotational output of the electric motor 30 is provided in the gear housing 5. The reduction gear mechanism 40 includes a pinion gear 40a attached to the end of the motor shaft 30c, an intermediate gear 40b that meshes with the pinion gear 40a, and a spindle 41 that meshes with the intermediate gear 40b. The spindle 41 is located below the motor shaft 30c and is supported by the gear housing 5 so as to be rotatable around the shaft. The tip of the spindle 41 protrudes from the gear housing 5, and the cutting tool 22 is attached to the tip.

  As shown in FIGS. 1 and 5, the cutting tool 22 is fixed to the tip of the spindle 41 by a mounting body 42. The attachment body 42 has an inner flange 42a that holds the cutting tool 22 from the left side and an outer flange 42b that holds the cutting tool 22 from the right side. The outer periphery of the blade 22 is covered with a cover body (9, 21, 23). The cover body includes a fixed cover 21 that covers substantially the upper half of the outer periphery of the cutting tool 22, a movable cover 23 that is movable at the rear portion of the fixed cover 21, and an auxiliary cover 9 that is movable at the front portion of the fixed cover 21. A dust box 28 for storing chips is connected to the upper portion of the fixed cover 21.

  As shown in FIG. 5, the fixed cover 21 is provided on the right side of the gear housing 5 and extends from the gear housing 5. As shown in FIGS. 1 and 2, the fixed cover 21 is located on the left side of the cutting tool 22 and is fixed to the circular saw body 20. The right side surface 21 b covers the right side of the upper peripheral area of the cutting tool 22. It has a peripheral wall 21c that connects the upper ends of the left side surface 21a and the right side surface 21b. The peripheral wall 21 c has an arc shape and covers the upper peripheral area of the blade 22. A discharge pipe 21d extending upward is formed at the front portion of the fixed cover 21, and the opening 28b of the dust box 28 is connected to the discharge pipe 21d.

  As shown in FIGS. 1 and 2, the dust box 28 has a box main body 28 a extending along the upper outer peripheral edge of the fixed cover 21. An opening 28b connected to the discharge pipe 21d of the fixed cover 21 is formed in the front portion of the box body 28a. The cutting tool 22 rotates in the direction of the arrow 28 h displayed on the right side surface of the dust box 28, and the cutting tool 22 cuts the workpiece W. The chips generated at this time are blown upward on the front side of the blade 22. The blown chips are introduced from the fixed cover 21 into the box body 28a and accumulated in the box body 28a.

  As shown in FIGS. 1 and 2, the dust box 28 has a lever 28g on the right side surface. The dust box 28 is detachably attached to the circular saw body 20 using a male screw integrated with the lever 28g. A discharge hole 28c is formed in the rear portion of the box body 28a. A lid 28d for opening and closing the discharge hole 28c is rotatably attached to the box body 28a by a pin 28e. When discharging the chips accumulated in the box body 28a, the box body 28a is first removed from the circular saw body 20. Next, the lid 28d is rotated to open the discharge hole 28c, and the chips are discharged from the box body 28a.

  As shown in FIG. 1, a through hole is formed in the rear portion of the lid 28d and is closed by the plug 28f. The stopper 28f can be removed from the lid 28d and connected to the vacuum device via a pipe in the through hole of the lid 28d. Thereby, the chips in the dust box 28 can be sucked into the vacuum device via the pipe.

  As shown in FIGS. 1 and 2, the movable cover 23 is located on the lower rear side of the fixed cover 21 and covers the rear outer region of the blade 22. The movable cover 23 has an arc shape and rotates about the same axis as the rotation center of the blade 22. The movable cover 23 is urged by a tension spring in a direction covering the cutting tool 22, that is, forward. When cutting the workpiece W, the tip (front end) of the movable cover 23 hits the workpiece W, and the movable cover 23 rotates rearward and moves above the workpiece W.

  As shown in FIGS. 2 and 3, the auxiliary cover 9 is located on the lower front side of the fixed cover 21. The auxiliary cover 9 is located in the front peripheral area of the blade 22 and covers the gap S between the front end of the fixed cover 21 and the base 10. The gap S changes according to the angle of the circular saw body 20 with respect to the base 10. In contrast, the auxiliary cover 9 moves relative to the fixed cover 21 or the base 10 according to the angle of the circular saw body 20. Therefore, the auxiliary cover 9 effectively suppresses chips from scattering forward from the gap S. The auxiliary cover 9 includes a dust cover 24 connected to the circular saw body 20 or the fixed cover 21, and an angular guide 14 that connects the dust cover 24 and the base 10.

  As shown in FIGS. 12 to 15, the dust cover 24 connects the first side wall 24 a long in the vertical direction, the second side wall 24 c facing the first side wall 24 a, and the front ends of the first side wall 24 a and the second side wall 24 c. It has a front wall 24b. The first side wall 24a has a vertically long hole 24d that is long in the vertical direction and a pin 24e that protrudes in a direction away from the second side wall 24c. The vertical hole 24d is substantially linear and forms a cam surface. As shown in FIGS. 2 and 3, one or a plurality of pins 19 protruding from the fixed cover 21 are inserted into the vertically elongated holes 24 d. A stopper portion having a diameter larger than the width of the vertical slot 24d is provided at the tip of the pin 19. The dust cover 24 is connected to the fixed cover 21 so as to be movable in the vertical direction by the stopper portion. The pin 24e is provided in the lower part of the first side wall 24a as shown in FIG. The pin 24e is connected to the longitudinal direction long hole 14f of the angular guide 14 as described later.

  As shown in FIGS. 12, 13, and 15, the vertical length of the second side wall 24c is shorter than that of the first side wall 24a. The upper end of the second side wall 24c is located below the upper end of the first side wall 24a, and the lower end of the second side wall 24c is located above the lower end of the first side wall 24a. The width of the second side wall 24c is narrower than that of the first side wall 24a, and the rear edge of the second side wall 24c is located in front of the rear edge of the first side wall 24a. The rear edge of the second side wall 24c has an arc shape and extends along the outer peripheral edge of the blade 22 as shown in FIG.

  12 and 15, the front wall 24b connects the front edge of the first side wall 24a and the front edge of the second side wall 24c, and faces the outer peripheral edge of the blade 22 as shown in FIG. The outer peripheral edge of the cutting tool 22 is located in or near the groove 24f formed by the first side wall 24a, the second side wall 24c, and the front wall 24b. Accordingly, chips generated by the cutting tool 22 during processing are blown up along the grooves 24f.

  As shown in FIGS. 12 to 15, the angular guide 14 includes a front wall 14 a and a first bracket 14 b and a second bracket 14 g that extend rearward from the front wall 14 a. A hole 14c is formed at one end (right end) of the front wall 14a, and a long hole 14d is formed at the other end (left end) of the front wall 14a. The hole 14c is circular and the left / right tilting support shaft 13 shown in FIG. As a result, the angular guide 14 tilts with respect to the base 10 about the left / right tilting support shaft 13.

  As shown in FIG. 14, the long hole 14d extends in an arc shape along the edge of the front wall 14a. The shaft portion of the thumbscrew 16 shown in FIG. 6 is inserted through the long hole 14d. The shaft portion of the thumbscrew 16 is also inserted into the long hole 11 a of the front support portion 11 that stands at the front end of the base 10. Similarly to the long hole 14d, the long hole 11a is also formed in an arc shape. The thumbscrew 16 is rotated to lock the angular guide 14 to the front support portion 11 so as to be releasable. The angular guide 14 is rotatable about the left and right tilting support shaft 13 with respect to the front support portion 11 when the lock is released. As shown in FIGS. 6 to 9, the circular saw body 20 can be tilted in the left-right direction with respect to the base 10 together with the angular guide 14, and can be held at a predetermined tilt angle with respect to the base 10 by the thumbscrew 16.

  As shown in FIGS. 12 and 14, the angular guide 14 has an instruction portion 14 i extending outward from the hole 14 c at a position facing the hole 14 c. The instruction part 14i protrudes outward beyond the outer edge of the front support part 11 shown in FIG. 6 and is visible from the front. A scale 11 b is displayed on the outer edge of the front support portion 11. By reading the scale 11b where the instruction unit 14i is located, the inclination angle of the angular guide 14 with respect to the base 10 in the left-right direction can be known. As will be described later, the circular saw body 20 is attached to the angular guide 14. Therefore, the angle of inclination of the circular saw body 20 in the left-right direction can be known by looking at the position of the instruction unit 14i using the scale 11b.

  As shown in FIGS. 4 and 6, the left / right tilting support shaft 13 is located in the lower right portion of the front support portion 11 and extends in the front-rear direction. The left / right tilting support shaft 13 is inserted into the front support portion 11 and the hole 14 c of the angular guide 14. A circular saw body 20 is attached to the angular guide 14. Therefore, as shown in FIGS. 6 and 8, the circular saw body 20 can be angularly adjusted in the left-right direction around the left-right tilting support shaft 13 together with the angular guide 14.

  As shown in FIG. 10, a rear support portion 12 is provided in the rear region of the base 10. The rear side support portion 12 stands with respect to the base 10, and a tilting plate 18 is attached to the rear side support portion 12 via a left / right tilt support shaft 17. The tilting plate 18 has a depth guide 71 extending upward, and the circular saw body 20 is connected to the depth guide 71. The left / right tilt support shaft 17 is positioned coaxially with the left / right tilt support shaft 13 shown in FIG. Therefore, the angle of the circular saw body 20 is adjusted in the left-right direction around the left and right tilt support shafts 13 and 17. Thus, as shown in FIGS. 6 and 8, the so-called inclined cutting can be performed by adjusting the cutting angle of the cutting tool 22 with respect to the workpiece W.

  As shown in FIGS. 12 to 15, the first bracket 14b extends rearward from one end portion of the front wall 14a, and the second bracket 14g extends rearward from the central region of the front wall 14a. The first bracket 14b and the second bracket 14g extend in parallel. A hole 14e is formed in the front portion of the first bracket 14b, and a hole 14h is formed in the second bracket 14g. The holes 14e and 14h are located on the same axis, and the vertical swing support shaft 15 is inserted through the holes 14e and 14h. As shown in FIGS. 4 and 5, the front portion of the circular saw body 20 is rotatably connected to the vertically swinging support shaft 15. Accordingly, as shown in FIGS. 2 and 3, the circular saw body 20 swings in the vertical direction with respect to the base 10 about the vertical swing support shaft 15. Thereby, the downward protrusion amount of the cutting tool 22 from the base 10 can be adjusted.

  As shown in FIG. 1, when the workpiece W is cut with the cutting tool 22, the base 10 is slid on the workpiece W. The cutting tool 22 protrudes downward from the base 10, and the depth of cut of the workpiece W is determined by the amount of protrusion. A cut depth adjusting mechanism 70 for adjusting the cut depth is provided at the rear portion of the base 10. The cut depth adjusting mechanism 70 has a depth guide 71 provided on the tilting plate 18 rotatably attached to the base 10 as shown in FIG.

  As shown in FIGS. 4 and 10, the depth guide 71 is formed at the end of the tilting plate 18 and extends upward and forward from the tilting plate 18 in an arc shape. An arcuate guide groove hole 71 a is formed in the depth guide 71. The fixing screw 72 is inserted into the guide groove hole 71a, and the tip of the fixing screw 72 is screwed into the left side surface of the fixing cover 21. A fixing lever 73 as an operation unit is attached to the head of the fixing screw 72. By operating the fixing lever 73 upward, the fixing screw 72 is loosened with respect to the depth guide 71, and the circular saw body 20 moves up and down with respect to the depth guide 71 together with the fixing screw 72. Thereby, the protrusion amount (cutting depth) of the cutting tool 22 from the base 10 is adjusted.

  A scale is displayed on the outer peripheral surface of the depth guide 71 as shown in FIGS. By obtaining the position of the fixing screw 72 using the scale, the amount of protrusion of the blade 22 from the base 10 is obtained. The fixing lever 73 is operated downward at a position where the protruding amount becomes a predetermined amount, and the circular saw body 20 is fixed to the depth guide 71 by the fixing screw 72. Thus, the cutting depth of the cutting tool 22 with respect to the workpiece W is fixed.

  As shown in FIGS. 2 and 3, the auxiliary cover 9 is moved in the vertical direction with respect to the circular saw body 20 by the auxiliary cover vertical movement mechanism 25. For example, by rotating the circular saw body 20 from the lower position shown in FIG. 2 to the upper position shown in FIG. 3, the dust cover 24, which is one part of the auxiliary cover 9, moves downward with respect to the circular saw body 20. The auxiliary cover up / down moving mechanism (up / down direction connecting structure) 25 includes a pin 19 and an up / down direction long hole 24d for connecting the circular saw body 20 and the dust cover 24 in the up / down direction. The pin 19 protrudes leftward from the front portion of the circular saw body 20, for example, the front portion of the fixed cover 21. The vertically long hole 24d is provided in the dust cover 24, and one or two pins 19 arranged vertically are inserted in the vertically long hole 24d so as to be movable. The vertically long hole 24d forms a cam surface that contacts the pin 19, and the pin 19 constitutes a cam follower that moves along the cam surface.

  As shown in FIGS. 2 and 3, the auxiliary cover up-and-down moving mechanism 25 has a pin 24 e for connecting the dust cover 24 and the base 10 and a longitudinally long hole 14 f. As shown in FIG. 13, the longitudinal longitudinal hole 14 f is formed in the rear region of the first bracket 14 b of the angular guide 14. The front / rear direction long hole 14f is long in the front / rear direction and is substantially linear. The front-rear direction long hole 14f extends with an inclination angle so as to be located upward as it is located rearward. A pin 24e formed on the dust cover 24 is movably inserted in the longitudinal hole 14f. Accordingly, the dust cover 24 is movably connected to the base 10 via the angular guide 14.

  As shown in FIG. 2, when the circular saw body 20 is positioned at the lower position, the pin 24e is positioned in the front region of the longitudinal slot 14f. Thereby, the dust cover 24 is positioned in the vicinity of the front portion of the angular guide 14. The pin 19 is located in the lower region of the vertical slot 24d. As a result, the dust cover 24 is positioned relatively above the circular saw body 20. As a result, the dust cover 24 covers the space between the base 10 and the front end portion of the fixed cover 21 while being located in the vicinity of the front portion of the blade 22.

  As shown in FIG. 3, when the circular saw body 20 is positioned at the upper position, the pin 24e is positioned in the rear area of the longitudinal slot 14f. As a result, the dust cover 24 is positioned in the vicinity of the rear portion of the angular guide 14. The pin 19 is located in the upper region of the vertical hole 24d. Thereby, the dust cover 24 is positioned relatively below the circular saw body 20. The clearance S between the front end of the fixed cover 21 and the base 10 is increased by moving the circular saw body 20 from the lower position shown in FIG. 2 to the upper position shown in FIG. In response to this, the dust cover 24 moves downward relative to the fixed cover 21.

  By rotating the circular saw body 20 from the lower position shown in FIG. 2 to the upper position shown in FIG. 3, the position of the front end of the blade 22 corresponding to the intersection of the blade 22 and the base 10 moves backward. Correspondingly, the lower end of the dust cover 24 moves rearward with respect to the fixed cover 21. Therefore, the dust cover 24 moves according to the vertical swing angle of the circular saw body 20 and moves in the front-rear direction, and the gap S between the front end of the fixed cover 21 and the base 10 can be made as small as possible.

  As shown in FIGS. 6 to 9, when the circular saw body 20 is tilted in the left-right direction, the angular guide 14 is tilted about the left-right tilt support shaft 13 together with the circular saw body 20. The dust cover 24 as well as the fixed cover 21 which is one part of the circular saw body 20 are tilted about the left and right tilting support shaft 13. When the circular saw body 20 is tilted in the left-right direction, the gap S between the front end of the fixed cover 21 and the base 10 also moves in the left-right direction. Accordingly, the dust cover 24 tilts in the left-right direction according to the tilt angle in the left-right direction of the circular saw body 20. As a result, the gap S between the front end of the fixed cover 21 and the base 10 is always suitably covered by the dust cover 24. For example, the dust cover 24 moves so that the gap S between the tip of the dust cover 24 and the base 10 is always 1 mm or less, preferably 0.5 mm or less.

  As shown in FIGS. 6 to 9, the auxiliary cover 9 tilts in the left-right direction with respect to the base 10 according to the angle in the left-right direction of the circular saw body 20 using the interlocking mechanism 26. The interlocking mechanism 26 has a left / right tilt support shaft 13 that connects the angular guide 14 to the base 10 so as to be rotatable in the left / right direction. Further, as shown in FIG. 2, the interlocking mechanism 26 has a longitudinal direction long hole 14f and a pin 24e for connecting the angular guide 14 and the dust cover 24 to the moving connection. Furthermore, the interlocking mechanism 26 has a vertically long hole 24d and a pin 19 for connecting the dust cover 24 to the circular saw body 20 so as to be movable.

  As shown in FIGS. 4 and 10, the circular saw body 20 has a battery attachment portion 3 to which the battery 2 is attached. The battery mounting portion 3 is located on the left side of the rear portion of the circular saw body 20. Similarly to the motor housing 4, the battery attachment portion 3 extends leftward from the left side surface of the fixed cover 21. The battery attachment portion 3 is generally flat and has a rail on the lower surface of the battery attachment portion 3. The rail extends, for example, in the left-right direction, and the battery 2 is removably attached to the lower surface of the battery attachment portion 3 using the rail. The battery 2 is a battery for an electric tool, and is attached to another electric tool such as a screw tightener. The battery 2 is, for example, an 18V output lithium ion battery, and can be charged with a separately prepared charger. Therefore, the battery 2 can be repeatedly used as a power source for the dustproof circular saw 1 or the like. The battery 2 is electrically connected to the controller 61 shown in FIG. 5 and supplies power to the electric motor 30 via the controller 61.

  As shown in FIGS. 4 and 5, the controller 61 is accommodated in a controller housing 7 provided between the battery mounting portion 3 and the motor housing 4. Various electrical components are electrically connected to the controller 61, for example, the electric motor 30, the sensor board 34 that detects the position of the rotor 30 b, the switch 53 (see FIG. 1) provided on the handle 6, and the like. The controller 61 includes a control circuit that transmits a control signal based on position information of the rotor 30b detected by the sensor substrate 34. Further, the controller 61 is electrically driven so as not to be overdischarged or overcurrent according to the detection result of the state of the drive circuit, battery 2 that switches the current of the electric motor 30 based on the control signal received from the control circuit. An auto-stop circuit that cuts off the power supply to the motor 30 is provided.

  As shown in FIGS. 1 and 4, the handle 6 has a mountain shape, and includes a standing portion 6 a that stands up from the motor housing 4, and a grip portion 6 b that slopes backward from the top of the standing portion 6 a and toward the battery mounting portion 3. Have. A trigger-type switch 53 is provided on the lower surface of the upper portion of the grip portion 6b. The switch 53 is supported by the grip portion 6b via a support shaft so as to be tiltable up and down, and is biased downward by a biasing member such as a compression spring. The user can pull the switch 53 upward against the urging force of the urging member with the fingertip of the hand holding the grip 6b. The switch 53 is pulled to transmit a signal to the controller 61 (see FIG. 5), and the controller 61 supplies the electric power from the battery 2 to the electric motor 30. As a result, the electric motor 30 is activated and the blade 22 rotates in the direction of the arrow 28h.

  As shown in FIGS. 1 and 6, the handle 6 is provided with a lock-on button 57. The lock-on button 57 is positioned above the switch 53 and penetrates the handle 6 in the left-right direction. The lock-on button 57 is provided so as to be tiltable in the vertical direction with respect to the handle 6. The electric motor 30 is locked in the activated state by tilting the lock-on button 57 downward while the switch 53 is pulled upward. Thereby, the electric motor 30 can be driven without continuously pulling the switch 53. Thus, the worker can easily work for a long time. When releasing the lock-on state, the switch 53 is pulled upward again. As a result, the lock-on button 57 returns to the original position.

  As shown in FIG. 5, a cooling fan 36 is attached to the motor shaft 30 c of the electric motor 30. The cooling fan 36 is located between the rotor 30b and the bearing 32 and rotates together with the motor shaft 30c. As the cooling fan 36 rotates together with the motor shaft 30 c, outside air is introduced into the motor housing 4 from the vent 4 a formed on the left surface of the motor housing 4. The introduced air flows to the controller housing 7 through the vent 4 b formed in the rear portion of the motor housing 4 after cooling the electric motor 30. The air is discharged from an exhaust port 7 a formed on the right surface of the controller housing 7 after cooling the controller 61 having a heat source such as an FET (field effect transistor) or a microcomputer.

  As shown in FIG. 5, the motor housing 4 is connected to a duct 65 that guides the air in the motor housing 4 forward. The duct 65 has an attachment portion 65 a that is connected to a connection port 4 c formed at the right front portion of the motor housing 4. The duct 65 extends forward along the front surface of the gear housing 5 and the side surface of the fixed cover 21 from the connection port 4c. A discharge port 65 b is formed at the tip of the duct 65, and the discharge port 65 b faces the smear line guide 10 c of the base 10. The smear wire guide 10c is provided at the front end of the base 10, and is formed by cutting off both the left and right sides of the smear wire guide 10c. The cutting tool 22 can be moved with high accuracy by moving the base 10 forward while positioning the smear wire guide 10c on the smear wire attached to the workpiece W. Air is discharged from the duct 65, and chips and the like accumulated in the vicinity of the sumi guide 10c are blown off by the discharged air. As a result, the visibility of the smear line guide 10c is increased, and the machining operation can be performed accurately and quickly.

  As shown in FIG. 5, a lock lever 44 is connected to the front portion of the gear housing 5 so as to be tiltable in the vertical direction. The lock lever 44 is connected to a lock member that locks the spindle 41 so as not to rotate, and the spindle 41 can be locked so as not to rotate by operating the lock lever 44. Thereby, the cutting tool 22 can be attached to and detached from the spindle 41.

  As shown in FIGS. 1 and 11, the base 10 has a substantially flat plate shape. A circular saw body 20 is supported above the base 10 so that the angle can be adjusted in the vertical direction and can be adjusted in the left-right direction. The base 10 is formed with a generally rectangular window portion 10a, and the cutting tool 22 is inserted through the window portion 10a. A parallel ruler 80 is attached to the front portion of the base 10 so that the position can be adjusted in the left-right direction.

  As shown in FIGS. 4 and 6, the parallel ruler 80 includes a connection bar 80b attached to the base 10 and a ruler body 80a provided at an end of the connection bar 80b. The ruler body 80 a is located on the right side of the base 10. When processing the workpiece W, the base 10 is placed on the workpiece W, and the ruler body 80a is brought into contact with the side surface of the workpiece W. The dustproof circular saw 1 is moved forward while the ruler body 80a is in contact with the side surface of the workpiece W. Thereby, the dustproof circular saw 1 can be moved in parallel to the side surface of the workpiece W, and the workpiece W can be cut with a predetermined width.

  As shown in FIGS. 4 and 6, the connecting bar 80 b is plate-like and long in the left-right direction, and extends beyond the left-right width of the base 10. One end of the connecting bar 80b is folded downward and folded back and extended below the base 10. The ruler body 80a is provided at the folded end of the connecting bar 80b. The ruler body 80a is long in the front-rear direction and faces in the left-right direction on the lower side of the base 10. Accordingly, the ruler body 80a can be brought into contact with the edge of the workpiece W.

  As shown in FIGS. 4 and 16, the base 10 is formed with a ruler holding groove 10e that movably accommodates the connecting bar 80b. The left and right ends of the ruler holding groove 10e are open to the left and right sides of the base 10. The position of the ruler body 80a in the left-right direction can be adjusted by moving the connecting bar 80b in the left-right direction along the ruler holding groove 10e. The connecting bar 80 b is fixed to the base 10 by a ruler fixing device 81.

  As shown in FIGS. 17 and 18, the ruler fixing device 81 pushes the connecting bar 80b toward the ruler holding groove 10e. The ruler holding groove 10e has a taper 10k at the front and rear end edges. The front and rear edges of the connecting bar 80b are pressed against the taper 10k. Therefore, the connecting bar 80b is prevented from rattling in the front-rear direction by the taper 10k of the ruler holding groove 10e. The lower surface of the connecting bar 80b may have a taper pressed against the ruler holding groove 10e at the front and rear end edges. Alternatively, only one of the connecting bar 80b and the ruler holding groove 10e may be tapered.

  As shown in FIGS. 16 and 17, the ruler fixing device 81 includes a bridge member 10 f provided in the base 10, a hole member 86 inserted through the base hole 10 g of the bridge member 10 f, and a shaft member 85 inserted through the hole member 86. Have As shown in FIG. 4, the bridge member 10f is provided in the vicinity of the end edge (for example, the left end edge) of the base 10, and straddles the ruler holding groove 10e in the front-rear direction. As shown in FIGS. 11 and 17, a rectangular hole 10d corresponding to the bridge member 10f is formed below the bridge member 10f instead of the ruler holding groove 10e.

  As shown in FIGS. 19 and 21, the hole member 86 includes a cylindrical portion 86a inserted into the base hole 10g of the bridge member 10f and a flange portion 86b formed at the lower end edge of the cylindrical portion 86a. A groove 86g is formed on the outer periphery of the upper portion of the cylindrical portion 86a. The tubular portion 86a is inserted into the bridge member 10f from below, and the retaining member 84 is fitted into the groove 86g located above the bridge member 10f. Thereby, the hole member 86 is attached to the bridge member 10f. The retaining member 84 is, for example, an E ring or a C ring. The hole member 86 has a tapered upper end portion 86d. The upper end portion 86d is annular and has a diameter that is smaller toward the upper side and is inclined on the entire circumference. Accordingly, it is difficult for chips to be accumulated on the upper surface of the hole member 86, and the chips are prevented from entering the hole 86c of the hole member 86 from the upper surface.

  As shown in FIGS. 19 and 21, the flange portion 86b is larger than the diameter of the base hole 10g of the bridge member 10f, and the upper surface of the flange portion 86b faces the lower surface of the bridge member 10f. An inclined surface 86e and a step 86f are formed on the upper surface of the flange portion 86b. As shown in FIGS. 21 to 24, the inclined surface 86e extends in the circumferential direction and gradually protrudes counterclockwise. Therefore, the inclined surface 86e formed on the upper surface of the flange portion 86b constitutes a side cam. A plurality of, for example, four inclined surfaces 86e are formed on the flange portion 86b, and a step 86f is formed between the inclined surfaces 86e. A wall that faces counterclockwise is formed by the step 86f.

  As shown in FIG. 20, an inclined surface 10h and a step 10i are formed on the lower surface of the bridge member 10f. The inclined surface 10h and the step 10i have shapes corresponding to the inclined surface 86e and the step 86f of the hole member 86 shown in FIG. The inclined surface 10h extends in the circumferential direction and is gradually recessed upward in the counterclockwise direction. Therefore, the inclined surface 10h formed on the lower surface of the bridge member 10f constitutes a side cam. A plurality of, for example, four inclined surfaces 10h are formed on the lower surface of the bridge member 10f, and a step 10i is formed between the inclined surfaces 10h. A wall facing the clockwise direction is formed by the step 10i.

  As shown in FIGS. 19 to 21, when the shaft member 85 is moved downward with respect to the hole member 86, the hole member 86 receives a force clockwise with respect to the bridge member 10 f together with the shaft member 85. At this time, the inclined surface 86e contacts the inclined surface 10h, and the hole member 86 is pushed downward with respect to the bridge member 10f. Specifically, the inclined surface 86e and the inclined surface 10h are not in contact with each other, but are in contact with each other. The retaining member 84 is pressed against the upper surface of the bridge member 10f by the hole member 86. Thereby, it is suppressed that the hole member 86 shakes in the axial direction with respect to the bridge member 10f. In addition, the friction between the inclined surface 86e and the inclined surface 10h is increased, and the hole member 86 is also prevented from rattling in the rotational direction with respect to the bridge member 10f. Thus, rattling of the hole member 86 with respect to the bridge member 10f due to vibration or the like is suppressed.

  As shown in FIGS. 19 to 21, when the shaft member 85 is moved upward with respect to the hole member 86, the hole member 86 receives a force counterclockwise with respect to the bridge member 10 f together with the shaft member 85. At this time, the step 86f of the hole member 86 hits the step 10i of the bridge member 10f. Thereby, it is suppressed that the hole member 86 rotates counterclockwise with respect to the bridge member 10f. By further rotating the shaft member 85 counterclockwise in this state, the shaft member 85 rotates counterclockwise with respect to the hole member 86, and the shaft member 85 moves upward.

  As shown in FIGS. 19 and 20, the operation member 88 is fixed to the upper end of the shaft member 85. The operation member 88 extends radially outward from the shaft member 85 and is gripped by the user. The shaft member 85 has a large diameter portion 85a and a small diameter portion 85b located below the large diameter portion 85a. A male screw is formed on the outer peripheral surface of the large diameter portion 85a. The large diameter portion 85 a is screwed into the hole member 86 in a state where the large diameter portion 85 a is inserted through the spring 83. The spring 83 is, for example, a coil spring, the upper end abuts on the operation member 88, and the lower end is supported by the bridge member 10f. The large diameter portion 85 a is screwed into a female screw formed in the hole 86 c of the hole member 86 against the urging force of the spring 83.

  19 and 20, the small diameter portion 85 b of the shaft member 85 protrudes downward from the hole member 86. The small diameter portion 85 b is inserted into the hole 87 c of the pressing member 87. A retaining member 89 is mounted in a groove 85c formed in the lower portion of the small diameter portion 85b. The retaining member 89 is, for example, an E ring or a C ring. The retaining member 89 and the large diameter portion 85a are larger in diameter than the small diameter portion 85b. Therefore, the pressing member 87 is rotatably attached to the small diameter portion 85b.

  As shown in FIGS. 19, 20, and 25, the pressing member 87 includes a rectangular portion 87a and leg portions 87b that protrude downward from the left and right end portions of the lower surface of the rectangular portion 87a. The rectangular portion 87a is inserted between the two pillars 10j of the bridge member 10f. The two columns 10j stand up against each other and face the side surface of the rectangular portion 87a. Thus, the rotation of the pressing member 87 is limited with respect to the bridge member 10f.

  As illustrated in FIGS. 17 and 18, the shaft member 85 is moved downward relative to the hole member 86 and the bridge member 10 f by rotating the shaft member 85 clockwise about the axis by using the operation member 88. The pressing member 87 moves downward together with the shaft member 85, and the leg portion 87b of the pressing member 87 presses the connecting bar 80b against the ruler holding groove 10e. Thereby, the position of the parallel ruler 80 with respect to the base 10 is maintained. By rotating the shaft member 85 counterclockwise about the axis, the shaft member 85 moves upward with respect to the hole member 86 and the bridge member 10f. The pressing member 87 moves upward together with the shaft member 85, and the pressing member 87 is separated from the connecting bar 80b. Accordingly, the position of the parallel ruler 80 can be adjusted in the left-right direction with respect to the base 10.

  As shown in FIG. 19, the bridge member 10 f which is a part of the base 10 is formed from aluminum in the same manner as the other parts of the base 10. On the other hand, the hole member 86 and the shaft member 85 are formed from a material having higher wear resistance or rigidity than the base 10 such as the bridge member 10f. For example, the hole member 86 and the shaft member 85 are formed from a metal material such as steel, iron, titanium, or a titanium alloy. It is preferable that the hole member 86 and the shaft member 85 are formed of materials having equivalent wear resistance or rigidity, or the same material. Specifically, the hole member 86 has a hole region including the hole 86 c, and the hole region is formed from a material having higher wear resistance or rigidity than the base 10. For example, the hole wall surface may be subjected to a surface treatment such as hard chrome plating or quenching. Alternatively, only the hole wall surface of the hole member 86 may be made of a metal material or the like.

  The portable circular saw (portable processing machine) 1 described above has a base 10, a parallel ruler 80, and a ruler fixing device 81 as shown in FIG. The base 10 supports the circular saw body (processing machine body) 20 and is installed on the workpiece W. The parallel ruler 80 is applied to the side surface when the circular saw body 20 is moved along the side surface of the workpiece W. As shown in FIGS. 6 and 17, the parallel ruler 80 includes a connecting bar 80 b slidably installed in the ruler holding groove 10 e of the base 10, and an end of the connecting bar 80 b positioned outside the base 10. It has a ruler body 80a extending along the side edge. The ruler fixing device 81 includes a hole 86c provided in the base 10, a shaft member 85 screwed into the hole 86c, and a pressing member 87 provided at an end of the shaft member 85 to press the connecting bar 80b against the ruler holding groove 10e. Have The hole region including the hole 86c is formed of a material having higher wear resistance than the other region of the base 10.

  Therefore, as shown in FIG. 17, even if chips generated during processing of the workpiece W enter the hole 86 c, the hole region has high wear resistance and is difficult to be cut by the chips. Therefore, the hole area is less likely to be worn by the chips, and rattling of the pressing member 87 caused by the wear of the hole 86c with respect to the base 10 is reduced. Thereby, the parallel ruler 80 can be stably fixed to the base 10.

  As shown in FIG. 17, the hole region (86 c) is formed of the same material as that of the shaft member 85. For example, the hole member 86 and the shaft member 85 are made of steel. Therefore, when the chips enter the hole 86c, the hole region is prevented from being scraped larger than the shaft member 85. For this reason, the hole region is less likely to be worn by chips, and the shakiness of the shaft member 85 and the pressing member 87 caused by the wear of the hole 86c with respect to the base 10 is reduced.

  As shown in FIG. 17, the hole region (86c) is formed of a steel material. Therefore, the hole region has higher wear resistance than other regions of the base 10 formed of aluminum or the like. Therefore, the hole area is less likely to be worn by chips.

  As shown in FIG. 17, the dust-proof circular saw 1 includes a hole member 86 that includes a hole 86 c and is detachably attached to another area of the base 10. Therefore, when the hole area of the hole 86c is damaged, not the entire base 10 but only the hole member 86 can be replaced with a new hole member 86. Thereby, the breakage of the hole 86c can be eliminated only by replacing a relatively small part.

  As shown in FIG. 17, the hole member 86 has a tapered upper end portion 86d. Therefore, it is difficult for chips generated during processing of the workpiece W to be stacked on the tip of the hole member 86. Therefore, the chips accumulated at the tip of the hole member 86 are less likely to enter the hole 86c of the hole member 86.

  As shown in FIG. 17, the base 10 has a bridge member 10f located above the connecting bar 80b and straddling the connecting bar 80b. A base hole 10g into which the hole member 86 is inserted is formed in the bridge member 10f. The hole member 86 has a cylindrical portion 86a inserted into the base hole 10g, and a flange portion 86b provided at the lower end edge of the cylindrical portion 86a and facing the lower surface of the bridge member 10f. A retaining member 84 facing the upper surface of the bridge member 10f is provided on the upper portion of the cylindrical portion 86a. Therefore, the hole member 86 is attached to the bridge member 10 f by the flange portion 86 b and the retaining member 84.

  As shown in FIGS. 20 and 21, between the upper surface of the flange portion 86b of the hole member 86 and the lower surface of the bridge member 10f, the mutual rotational force is converted into an axial force so that the retaining member 84 becomes the bridge member 10f. A pressing structure is provided. Therefore, the hole member 86 is strongly held with respect to the bridge member 10f, and it becomes difficult to rattle the bridge member 10f.

  The above-described portable circular saw (portable cutting machine) 1 includes a circular saw body (cutting machine body) 20 including an electric motor 30 for rotating the disk-shaped cutting tool 22 and a disk-shaped cutting tool 22 as shown in FIGS. A fixed cover 21 is fixed to the circular saw body 20 so as to cover a part of the outer periphery. The base 10 supports the circular saw body 20 so that the angle of the circular saw body 20 can be adjusted upward and downward, and adjusts the amount of downward projection of the disk-shaped cutting tool 22 and supports the circular saw body 20 so that the angle of the circular saw body 20 can be adjusted in the horizontal direction. Thus, the inclination angle of the rotation center axis of the disk-shaped cutting tool 22 can be adjusted. The auxiliary cover 9 covers the outer periphery of the disk-shaped cutting tool 22 in the gap S between the fixed cover 21 and the base 10 in the vicinity of the vertical swing center (vertical swing support shaft 15) of the circular saw body 20. The auxiliary cover up / down movement mechanism 25 moves the auxiliary cover 9 relative to the circular saw body 20 in accordance with the vertical angle of the circular saw body 20. The left / right tilt support shaft 13 connects the auxiliary cover 9 to the base 10 so as to be rotatable in the left / right direction. The interlocking mechanism 26 rotates the auxiliary cover 9 in the left-right direction about the left-right tilt support shaft 13 according to the left-right angle of the circular saw body 20.

  Therefore, not only when the circular saw body 20 is moved in the vertical direction with respect to the base 10 as shown in FIGS. 2 and 3, but also when the circular saw body 20 is inclined in the horizontal direction as shown in FIGS. The auxiliary cover 9 follows the angle of the circular saw body 20. Although the shape of the gap S between the fixed cover 21 and the base 10 changes according to the vertical and horizontal angles of the circular saw body 20, the auxiliary cover 9 moves corresponding to the change in the shape of the gap S. Therefore, the auxiliary cover 9 can reduce the scattering of chips from the gap S between the fixed cover 21 and the base 10.

  As shown in FIGS. 6 and 15, the auxiliary cover 9 has an angular guide 14 attached to the base 10 so that the angle can be adjusted in the left-right direction. Brackets 14b and 14g for connecting the circular saw body 20 to the angular guide 14 are provided. Therefore, the angular guide 14 of the auxiliary cover 9 and the circular saw body 20 are both adjusted in the horizontal direction by adjusting the angular angle of the angular guide 14 in the horizontal direction.

  As shown in FIG. 2, the auxiliary cover 9 has an angular guide 14 that is attached to the base 10 so that the angle can be adjusted in the left-right direction, and a dust cover 24 that is connected to the angular guide 14 and the circular saw body 20. . Therefore, as shown in FIGS. 7 and 9, the dust cover 24 tilts in the left-right direction with respect to the base 10 in conjunction with the angle in the left-right direction of the angular guide 14. Furthermore, the dust cover 24 moves relative to the circular saw body 20 in conjunction with the vertical angle of the circular saw body 20 as shown in FIGS.

  As shown in FIGS. 2 and 3, the dustproof circular saw 1 has a vertical connection structure (auxiliary cover vertical movement mechanism 25) that is connected to the circular saw body 20 so as to be movable in the vertical direction. Accordingly, the dust cover 24 moves in the vertical direction with respect to the circular saw body 20 in conjunction with the vertical angle of the circular saw body 20.

  As shown in FIG. 2, the vertical connection structure (25) has a vertical long hole 24d formed in the dust cover 24 that is long in the vertical direction, and protrudes from the circular saw body 20 and is inserted into the vertical long hole 24d. It has the pin 19 which moves along the direction long hole 24d. Therefore, the dust cover 24 is connected to the circular saw body 20 so as to be movable in the vertical direction with a relatively simple structure.

  As shown in FIGS. 2 and 3, by adjusting the angle of the circular saw body 20 in the vertical direction, the intersection of the outer periphery of the disk-shaped cutting tool 22 and the base 10 moves in the front-rear direction. The dust-proof circular saw 1 has an auxiliary cover back-and-forth movement mechanism 27 that moves the lower end portion of the dust cover 24 in the front-rear direction corresponding to the movement of the intersection. The auxiliary cover back-and-forth movement mechanism 27 is formed in the front-rear direction long hole 14f formed in the angular guide 14 and long in the front-rear direction, and protrudes from the dust cover 24 and is movable along the front-rear direction long hole 14f. It has a pin 24e to be inserted.

  Therefore, when the intersection of the outer periphery of the disk-shaped blade 22 and the base 10 moves back and forth, the lower end of the dust cover 24 moves in the front-rear direction. Thereby, the dust cover 24 can always be located in the vicinity of the disk-shaped blade 22. Thus, the scattering of chips generated by the disk-shaped cutting tool 22 can be suitably suppressed by the dust cover 24.

  As shown in FIG. 2, the angular guide 14 is provided with a bracket 14b to which the circular saw body 20 is attached so as to be rotatable in the vertical direction. A longitudinal hole 14f of the angular guide 14 is formed in the bracket 14b. The bracket 14 b is close to the circular saw body 20 in order to be attached to the circular saw body 20. Since the dust cover 24 is coupled to the longitudinal hole 14f of the bracket 14b, the dust cover 24 is also close to the circular saw body 20. Since the disc-shaped cutting tool 22 is attached to the circular saw body 20, the dust cover 24 can be brought close to the disc-shaped cutting tool 22. Thus, the dust cover 24 can suitably suppress the scattering of chips generated by the disk-shaped blade 22.

  As shown in FIGS. 2 and 3, the dust-proof circular saw 1 has an auxiliary cover 9 and an auxiliary cover vertical movement mechanism 25. The auxiliary cover 9 is attached to the fixed cover 21 so as to cover the outer periphery of the disk-shaped cutting tool 22 in the gap S between the fixed cover 21 and the base 10 in the vicinity of the vertical swing center (vertical swing support shaft 15) of the circular saw body 20. Mounted movably. The auxiliary cover up / down moving mechanism 25 moves the auxiliary cover 9 relative to the fixed cover 21 in accordance with the vertical angle of the circular saw body 20.

  Therefore, as shown in FIGS. 2 and 3, the auxiliary cover 9 moves relative to the fixed cover 21 by adjusting the angle of the circular saw body (cutting machine body) 20 with respect to the base 10 in the vertical direction. When the circular saw body 20 is tilted in the left-right direction, the auxiliary cover 9 is tilted in the left-right direction together with the fixed cover 21 because the auxiliary cover 9 is attached to the fixed cover 21. Therefore, although the shape of the gap S between the fixed cover 21 and the base 10 changes depending on the angle of the circular saw body 20, the auxiliary cover 9 moves corresponding to the shape of the gap S. Thereby, the auxiliary cover 9 can suppress the scattering of chips from the gap S between the fixed cover 21 and the base 10.

  As shown in FIGS. 2 and 3, the portable circular saw (portable cutting machine) 1 includes a cover body (9, 9) attached to the circular saw body (cutting machine body) 20 so as to cover a part of the outer periphery of the disk-shaped cutting tool 22. 21, 23). The cover body tilts with the circular saw body 20 in the left-right direction. A portion of the cover body swings in the vertical direction of the circular saw body 20 so as to reduce the gap S between the cover body and the base 10 in the vicinity of the vertical swing center (vertical swing support shaft 15) of the circular saw body 20. In conjunction with the movement, the circular saw body 20 moves up and down.

  Accordingly, as shown in FIGS. 2 and 3, by adjusting the angle of the circular saw body 20 with respect to the base 10 in the vertical direction, a part of the cover body (9, 21, 23) can be moved vertically with respect to the circular saw body 20. Moving. When the circular saw body 20 is tilted in the left-right direction as shown in FIGS. 7 and 9, the cover body is tilted together with the circular saw body 20 because it is attached to the circular saw body 20. Therefore, although the shape of the gap between the cover body and the base 10 may change depending on the angle of the circular saw body 20, the position and angle of a part of the cover body (dust cover 24) depends on the angle of the circular saw body 20. Change. Thereby, the clearance gap S between a cover body and the base 10 can be made small, and scattering of a chip can be suppressed reliably.

  As shown in FIGS. 2 and 3, the dust cover 24 is slidably connected to the circular saw body 20 by a pin 19 inserted in the vertically elongated hole 24 d. Instead of this, the dust cover 24 may slide while abutting against a guide wall provided in the circular saw body 20 and supported by the guide wall.

  The dustproof circular saw 1 has been described above as an example of a portable cutting machine. Alternatively, the portable cutting machine may be a cutter that rotates a diamond wheel as a circular cutting tool.

  As described above, the auxiliary cover 9 and the circular saw body 20 are integrally tilted in the left-right direction around the left-right tilt support shaft 17. Alternatively, the auxiliary cover 9 and the circular saw body 20 may be separately attached to the left and right tilting support shaft 17 so as to be tiltable. In this case, for example, a link mechanism or the like is preferably provided as an interlocking mechanism for tilting the auxiliary cover 9 in the left-right direction in conjunction with the tilting of the circular saw body 20 in the left-right direction.

  As shown in FIGS. 2 and 3, the vertical connecting structure (25) has a vertically long slot 24 d formed in the dust cover 24 that is long in the vertical direction, protrudes from the circular saw body (cutting machine body) 20, and is long in the vertical direction. It has the pin 19 inserted in the up-down direction long hole 24d so that a movement along the hole 24d is possible. Instead, the vertical connection structure (25) has a vertically long slot formed in the circular saw body 20 that is long in the vertical direction and protrudes from the dust cover 24 and is movable along the vertical slot. You may have a pin inserted in a hole.

  As shown in FIGS. 2 and 3, the auxiliary cover longitudinal movement mechanism 27 is formed in the angular guide 14 and extends in the longitudinal direction long hole 14 f that is long in the longitudinal direction, and protrudes from the dust cover 24 and moves along the longitudinal direction long hole 14 f. It has the pin 24e inserted in the front-back direction long hole as possible. Instead, the auxiliary cover longitudinal movement mechanism 27 is formed in the dust cover 24 and is elongated in the front-rear direction, and is elongated in the front-rear direction so as to protrude from the angular guide 14 and move along the longitudinal slot. You may have a pin inserted in.

  A dustproof circular saw 1 shown in FIGS. 26 to 47 may be used instead of the dustproof circular saw 1 shown in FIGS. A dust-proof circular saw 1 shown in FIGS. 26 to 47 has a dust cover 29 shown in FIGS. 28 and 37 in place of the dust cover 24 shown in FIGS. A dust-proof circular saw 1 shown in FIGS. 26 to 47 has a blower mechanism 90 shown in FIG. 29 in place of the duct 65 shown in FIG. The dust box 28 shown in FIGS. 26 and 45 has a temporary holding mechanism 28j in addition to the structure shown in FIG. Hereinafter, the dust-proof circular saw 1 shown in FIGS. 26 to 47 will be described focusing on differences from the dust-proof circular saw 1 shown in FIGS. The same parts as those in the dustproof circular saw 1 shown in FIGS. 1 to 25 are denoted by the same reference numerals, and the dustproof circular saw 1 shown in FIGS.

  As shown in FIGS. 27 and 28, the dustproof circular saw 1 has an auxiliary cover 9. The auxiliary cover 9 includes a dust cover 29 and an angular guide 14 that connects the dust cover 29 to the base 10. As shown in FIGS. 37 to 40, the dust cover 29 connects the first side wall 29a which is long in the vertical direction, the second side wall 29c facing the first side wall 29a, and the front ends of the first side wall 29a and the second side wall 29c. It has a front wall 29b. A hole 29g is formed in the upper and lower central region of the first side wall 29a. A shaft member 27A shown in FIG. 27 is inserted into the hole 29g, and the shaft member 27A is also inserted into the hole 14k of the angular guide 14. Thereby, the dust cover 29 is rotatably connected to the angular guide 14.

  As shown in FIGS. 37 and 38, cam surfaces 29d and 29e are formed on the first side wall 29a. The cam surface 29d is located in the region above the rear edge of the first side wall 29a, and is located above the hole 29g, for example. The cam surface 29e is located in a region below the rear edge of the first side wall 29a, for example, below the hole 29g. Each of the cam surfaces 29d and 29e is recessed forward, and a convex portion 29f protruding rearward is formed between the cam surfaces 29d and 29e.

  As shown in FIG. 38, the vertical length of the second side wall 29c is shorter than that of the first side wall 29a. The upper end of the second side wall 29c is located below the upper end of the first side wall 29a, and the lower end of the second side wall 29c is located above the lower end of the first side wall 29a. The width of the second side wall 29c is narrower than that of the first side wall 29a, and the rear edge of the second side wall 29c is located in front of the rear edge of the first side wall 29a. The rear edge of the second side wall 29c has an arc shape and extends along the outer peripheral edge of the blade 22 as shown in FIG.

  37, 39, and 40, the front wall 29b connects the front edge of the first side wall 29a and the front edge of the second side wall 29c, and faces the outer peripheral edge of the blade 22 as shown in FIG. The outer peripheral edge of the cutting tool 22 is located in or near the groove 29f formed by the first side wall 29a, the second side wall 29c, and the front wall 29b. Therefore, chips generated by the cutting tool 22 during processing are blown up along the grooves 29f.

  As shown in FIGS. 37 to 40, the angular guide 14 includes a front wall 14a, a first bracket 14j and a second bracket 14g extending rearward from the front wall 14a. The first bracket 14j extends rearward from one end of the front wall 14a, and the second bracket 14g extends rearward from the central region of the front wall 14a. The first bracket 14j and the second bracket 14g extend in parallel.

  As shown in FIGS. 27 and 28, the auxiliary cover 9 is tilted with respect to the circular saw body 20 by the auxiliary cover tilting mechanism 25A. For example, by rotating the circular saw body 20 from the lower position shown in FIG. 27 to the upper position shown in FIG. 28, the dust cover 29 that is one part of the auxiliary cover 9 is tilted forward with respect to the circular saw body 20. The auxiliary cover tilting mechanism 25A has cam surfaces 29d and 29e of the dust cover 29 and pins (cam followers) 19A and 19B that come into contact with the cam surfaces 29d and 29e.

  As shown in FIGS. 27 and 28, the pins 19 </ b> A and 19 </ b> B are provided on the circular saw body 20. For example, the pins 19 </ b> A and 19 </ b> B are provided on the fixed cover 21 and protrude rightward from the left side surface 21 a of the fixed cover 21. The pins 19A and 19B are cylindrical, and their outer peripheral surfaces abut against the cam surfaces 29d and 29e. By setting the circular saw body 20 to the lower position shown in FIG. 27, the pins 19A and 19B come into contact with the lower regions of the cam surfaces 29d and 29e, respectively. By placing the circular saw body 20 in the upper position shown in FIG. 3, the pins 19A and 19B come into contact with the upper regions of the cam surfaces 29d and 29e, respectively.

  As shown in FIGS. 27 and 28, when the circular saw body 20 is moved upward with respect to the base 10 around the vertical swing support shaft 15, the pin 19A moves upward and pushes the cam surface 29d forward. As a result, the dust cover 29 rotates clockwise about the shaft member 27A. When the circular saw body 20 is moved downward about the vertical swing support shaft 15 with respect to the base 10, the pin 19B pushes the cam surface 29e forward while moving downward. As a result, the dust cover 29 rotates counterclockwise around the shaft member 27A.

  As shown in FIG. 38, a hole 14k is formed in the rear region of the first bracket 14j of the angular guide 14. A shaft member 27A penetrating through the hole 29g of the dust cover 29 is inserted into the hole 14k. Therefore, the dust cover 29 is rotatable about the shaft member 27 </ b> A and is rotatably connected to the base 10 via the angular guide 14.

  As shown in FIG. 27, when the circular saw body 20 is positioned at the lower position, the lower end of the dust cover 29 is close to the base 10. Thereby, the dust cover 29 covers the gap S between the base 10 and the front end of the fixed cover 21. By rotating the circular saw body 20 from the lower position shown in FIG. 27 to the upper position shown in FIG. 3, the position of the front end of the blade 22 corresponding to the intersection of the blade 22 and the base 10 moves backward.

  Correspondingly, the lower end portion of the dust cover 29 also moves rearward with respect to the base 10. Accordingly, the lower end portion of the dust cover 29 moves in the front-rear direction according to the vertical swing angle of the circular saw body 20 and is always located in the vicinity of the blade 22. Therefore, the dust cover 29 effectively covers the gap S between the base 10 and the front end of the fixed cover 21.

  As shown in FIGS. 31 to 34, the auxiliary cover 9 tilts in the left-right direction with respect to the base 10 according to the angle in the left-right direction of the circular saw body 20 using the interlock mechanism 26 (angular guide 14). That is, the angular guide 14 is connected to the base 10 so as to be rotatable about the left / right tilting support shaft 13. The auxiliary cover 9 is connected to the angular guide 14 through a shaft member 27A inserted into the hole 14k of the angular guide 14. Therefore, when the circular saw body 20 is tilted in the left-right direction with respect to the base 10 together with the angular guide 14, the auxiliary cover 9 is also tilted in the left-right direction relative to the base 10 together with the angular guide 14.

  As shown in FIGS. 30 and 31, the circular saw body 20 is provided with a blower mechanism 90 that blows the air in the motor housing 4 forward. The blower mechanism 90 includes a blower base 92 attached to the motor housing 4 and a rotary nozzle 91 attached to the blower base 92. The blower base 92 is attached to the motor housing 4 so as to cover the opening 4 d of the motor housing 4. The opening 4 d is located on the outside in the radial direction of the cooling fan 36, that is, in the region directly below the wind of the cooling fan 36. The opening 4 d faces forward and is covered by the blower base 92.

  As shown in FIGS. 41 to 44, the blower base 92 has a front wall 92a and a peripheral wall 92b that rises rearward from the outer periphery of the front wall 92a. The upper arm 92e extends upward from the upper part of the peripheral wall 92b. An upper attachment portion 92f extends rearward from the upper end of the upper arm 92e. A mounting hole 92g penetrating in the left-right direction is formed in the upper mounting portion 92f. The lower arm 92h extends downward from the lower portion of the peripheral wall 92b. A lower attachment portion 92j extends rearward from the lower end of the lower arm 92h. A mounting hole 92j that penetrates in the left-right direction is formed in the lower mounting portion 92j.

  As shown in FIG. 34, the blower base 92 is attached to the front surface of the motor housing 4 by screws 93 inserted into the attachment holes 92g and 92j. As shown in FIG. 42, a circular opening 92c and a plurality of extending grooves 92d are formed in the front wall 92a. The plurality of extending grooves 92d are three, for example, and extend radially outward from the opening 92c. The plurality of extending grooves 92d are located at regular intervals, for example, at 120 ° intervals. The rotary nozzle 91 is passed through the opening 92c, and the rotary nozzle 91 is attached to the blower base 92.

  As shown in FIGS. 41 to 44, the rotary nozzle 91 has a cylindrical main body nozzle 91a, a neck portion 91c, and a stopper portion 91b provided on the same axis. A plurality of convex portions 91e are formed on the outer peripheral surface of the main body nozzle 91a. The plurality of convex portions 91e protrude in the radial direction from the main body nozzle 91a and are arranged at equal intervals in the circumferential direction. For example, the three convex portions 91e are arranged at intervals of 120 °. The convex portion 91e has a predetermined length in the axial direction on the outer peripheral surface of the main body nozzle 91a. The rotary nozzle 91 is inserted into the opening 92c of the blower base 92 from the rear so that the convex portion 91e penetrates the extending groove 92d.

  As shown in FIGS. 41 to 44, the stopper portion 91 b has a larger diameter than the main body nozzle 91 a and the opening 92 c of the blower base 92. Therefore, the stopper portion 91b comes into contact with the rear surface of the front wall 92a of the blower base 92 when the rotary nozzle 91 is inserted into the opening 92c. As a result, the rotary nozzle 91 is prevented from coming out forward with respect to the blower base 92.

  As shown in FIGS. 41 to 44, the protrusion 91e of the main body nozzle 91a is passed through the extension groove 92d of the blower base 92 from behind. Then, the main body nozzle 91 a is rotated about the axis with respect to the blower base 92. As a result, the convex portion 91e is positioned on the front surface of the front wall 92a of the blower base 92, and the rotation nozzle 91 is prevented from coming out backward with respect to the blower base 92. By attaching the rotary nozzle 91 to the blower base 92, the neck 91c is positioned in the opening 92c.

  The rotary nozzle 91 can be rotated about the axis with respect to the blower base 92 by an orientation changing mechanism 94. As shown in FIGS. 16 and 18, the direction changing mechanism 94 has an opening 92 c of the blower base 92 and a neck 91 c of the rotary nozzle 91. The neck portion 91c has the same diameter as the main body nozzle 91a and does not have the convex portion 91e. The neck portion 91c is cylindrical, and the opening portion 92c is circular. Therefore, the neck part 91c can rotate with respect to the opening part 92c and can be stably supported. Thus, the rotary nozzle 91 is rotatably connected to the blower base 92 about the axis.

  As shown in FIGS. 41 to 44, the direction changing mechanism 94 further includes a stopper portion 91 b and a convex portion 91 e to prevent the rotary nozzle 91 from coming off from the blower base 92. An O-ring 95 is provided on the neck 91 c of the rotary nozzle 91. The O-ring 95 is located between the stopper portion 91 b and the front wall 92 a of the blower base 92 and closes the gap between the rotary nozzle 91 and the blower base 92.

  As shown in FIGS. 41 and 43, the rotary nozzle 91 has a front face 91f and an outlet 91d having an inclination angle with respect to the axis. The blower outlet 91d extends at an angle with respect to the axis at the tip of the rotary nozzle 91. The blower outlet 91d is inclined with respect to the axis similarly to the front face 91f, and the wind blown from the blower outlet 91d has a predetermined angle with respect to the axis.

  As shown in FIGS. 30 and 31, the blower mechanism 90 is located on the front surface of the circular saw body 20. The wind generated by the cooling fan 36 is introduced into the blower base 92 through the opening 4 d of the motor housing 4. The air in the blower base 92 passes through the through hole at the center of the axis of the rotary nozzle 91. The blower outlet 91d of the rotary nozzle 91 is opened forward, and the wind is blown forward of the circular saw body 20 through the blower outlet 91d.

  As shown in FIG. 31, the rotary nozzle 91 is set at a predetermined angle around an axis extending in the front-rear direction. By rotating the rotary nozzle 91 about the axis, the air outlet 91d faces in the left-right direction and the up-down direction. Therefore, the wind blown from the outlet 91d can be adjusted in the left-right direction and the up-down direction.

  As shown in FIGS. 30 and 31, the blower mechanism 90 is located outward in the rotational radial direction of the cooling fan 36 and is located directly under the wind generated by the cooling fan 36. For this reason, the distance from the cooling fan 36 to the air outlet 91d is short, and the frictional resistance received by the wind flowing between them is small. Therefore, the speed of the wind blown from the outlet 91d is relatively fast. The direction of the wind blown from the outlet 91d is determined by the rotary nozzle 91. For example, the rotating nozzle 91 is directed toward the smear line guide 10c of the base 10, and the wind flows toward the smear line guide 10c.

  As shown in FIGS. 30 and 31, when the blower outlet 91d of the blower mechanism 90 is directed to the sumi guide 10c, the chips and the like accumulated in the vicinity of the sumi guide 10c are blown away by the wind blown from the blow outlet 91d. Can do.

  As shown in FIGS. 45 to 47, the dust box 28 has a temporary holding mechanism 28j that temporarily holds the plug 28f removed from the lid 28d. The temporary holding mechanism 28j includes a pair of rails 28k and a bridge portion 28l that connects the rear ends of the pair of rails 28k. The pair of rails 28k extend in the front-rear direction along the outer peripheral surface of the box body 28a. The bridge portion 28l forms a gap with the outer peripheral surface of the box body 28a. The plug 28f has a cylindrical portion 28f2 to be inserted into the opening 28d1 of the lid 28d and a cover portion 28f1 that covers the opening 28d1. The cover portion 28f1 is circular and is larger than the diameter of the tube portion 28f2, and protrudes radially outward from one end of the tube portion 28f2.

  46 and 47, the plug 28f is moved rearward along the rail 28k while the cover 28f1 of the plug 28f is inserted below the rail 28k. As a result, the cover portion 28f1 is positioned below the bridge portion 28l and the rail 28k. The cylinder portion 28f2 protrudes upward from between the rails 28k. When removing the stopper 28f from the temporary holding mechanism 28j, the stopper 28f is moved forward along the rail 28k. The chips and air in the dust box 28 flow from the front to the rear, and only the chips accumulate at the rear. On the other hand, after flowing from the front to the rear, the air is reversed while descending, flows forward, and is discharged out of the dust box 28 through the escape hole 28m. Subsequently, the air flows, for example, to the right in the fixed cover 21 and is discharged out of the fixed cover 21.

  As described above, the blower mechanism 90 includes the air outlet 91d that blows out the wind and the direction changing mechanism 94 that can change the direction of the air outlet 91d. Therefore, the direction of the wind blown from the blower mechanism 90 can be set to a desired angle, for example, according to the work situation.

  The blower mechanism 90 described above has a wind outlet 91d, and the outlet 91d is set in an orientation in which chips flying in the air in front of the circular saw body (cutting machine body) 20 can be blown away. As a result, chips floating in front of the operator's eyes can be blown off.

  As described above, the dust covers 24 and 29 are attached to the base 10 via the angular guides 14 provided near the front end of the base 10. Therefore, the dust covers 24 and 29 can be made small. For example, when the dust cover is rotatably connected to the rotation center of the blade 22, the dust cover needs to be extended from the rotation center of the blade 22 to the vicinity of the front end of the base 10. Compared to such a dust cover, the dust covers 24 and 29 can be made smaller.

  27 and 28, the dust-proof circular saw 1 has a vertical connection structure (auxiliary cover tilt mechanism 25A) that connects the dust cover 29 to the circular saw body (cutting machine body) 20 so as to be movable in the vertical direction. Have. In the vertical connection structure, when the circular saw body 20 moves up and down with respect to the base 10, the dust cover 29 is tilted with respect to the base 10 and moved in the vertical direction with respect to the circular saw body 20.

  The vertical connection structure has cam surfaces 29d and 29e formed in the dust cover 29 that are long in the vertical direction, and protrudes from the circular saw body 20 and is movable along the cam surfaces 29d and 29e. Cam followers (pins 19A and 19B). Therefore, the dust cover 29 is connected to the circular saw body 20 so as to be movable in the vertical direction with a relatively simple structure.

  27 and 28 has a vertical connection structure (auxiliary cover tilt mechanism 25A) having cam surfaces 29d and 29e and cam followers (pins 19A and 19B). Instead, the vertical connecting structure (auxiliary cover tilting mechanism 25A) has a cam surface formed in the circular saw body 20 that is long in the vertical direction, protrudes from the dust cover 29, and is movable along the cam surface. You may have a cam follower (pin) to contact | abut.

  The various embodiments described above in detail with reference to the accompanying drawings are exemplary of the present invention and are not intended to limit the present invention. The detailed description teaches those skilled in the art to make, use, and / or practice various aspects of the present teachings and is not intended to limit the scope of the invention. Moreover, each additional feature and teaching described above may be applied and / or used separately or in conjunction with other features and teachings to provide an improved portable cutting machine and / or method of making and using the same. Is what can be done.

1 Portable circular saw, dustproof circular saw (portable cutting machine)
2 Battery 3 Battery mounting portion 4 Motor housing 5 Gear housing 6 Handle 7 Controller housing 9 Auxiliary cover 10 Base 11 Front support portion 12 Rear support portions 13 and 17 Left and right tilt support shafts 14 Angular guides 14b, 14g and 14j Bracket 14f Front and rear Directional long hole 15 Vertical swing support shaft 17 Left / right tilt support shaft 18 Tilt plate 19 Pin 19A, 19B Pin (cam follower)
20 Circular saw body (cutting machine body)
21 Fixed cover 22 Disc-shaped blade (blade)
23 Movable covers 24, 29 Dust cover 24e Pin 24d Vertically long hole 25 Auxiliary cover vertical moving mechanism (vertical connecting structure)
25A Auxiliary cover tilting mechanism 26 Interlocking mechanism 27 Auxiliary cover back-and-forth movement mechanism 28 Dust box 29d, 29e Cam surface 30 Electric motor 36 Cooling fan 40 Reduction gear mechanism 61 Controller 65 Duct 70 Depth of cut adjustment mechanism 71 Depth guide 73 Fixing lever 80 Parallel ruler 81 Ruler fixing device

Claims (9)

A portable cutting machine,
A cutting machine body equipped with a motor for rotating the disk-shaped cutting tool;
A fixed cover fixed to the cutting machine body so as to cover a part of the outer periphery of the disk-shaped cutting tool;
The cutting machine main body is supported upward so that the angle can be adjusted in the vertical direction, and the amount of downward projection of the disk-shaped cutting tool is adjusted, and the cutting machine main body is supported so that the angle can be adjusted in the left-right direction, and the disk shape is supported. A base that can adjust the inclination angle of the right and left direction of the blade,
An auxiliary cover that covers the outer periphery of the disk-shaped cutting tool in the gap between the fixed cover and the base in the vicinity of the swing center in the vertical direction of the cutting machine body;
An auxiliary cover up-and-down moving mechanism for moving the auxiliary cover with respect to the cutting machine body according to an angle in the vertical direction of the cutting machine body;
A left-right tilting support shaft for connecting the auxiliary cover to the base so as to be rotatable in the left-right direction;
A portable cutting machine having an interlocking mechanism that rotates the auxiliary cover in the left-right direction about the left-right tilt support shaft according to the angle in the left-right direction of the cutting machine body. The portable cutting machine according to claim 1,
The auxiliary cover has an angular guide attached to the base so that the angle can be adjusted in the left-right direction,
A portable cutting machine in which a bracket to which the cutting machine main body is connected is provided on the angular guide. The portable cutting machine according to claim 1 or 2,
The auxiliary cover is a portable cutting machine having an angular guide attached to the base so that the angle can be adjusted in the left-right direction, and a dust cover connected to the angular guide and the cutting machine body. A portable cutting machine according to claim 3,
The portable cutting machine provided with the up-down direction connection structure which connects the said dust cover with the said cutting machine main body so that a movement to an up-down direction is possible. The portable cutting machine according to claim 4,
The vertical connecting structure includes a cam surface formed in one of both members of the dust cover and the cutting machine body and extending in the vertical direction, and protrudes from the other one of the two members and on the cam surface. A portable cutting machine having a cam follower that abuts on the cam surface so as to be movable along the cam surface. It is a portable cutting machine as described in any one of Claims 3-5,
By adjusting the angle of the cutting machine body in the vertical direction, the intersection of the outer periphery of the disk-shaped cutting tool and the base moves in the front-rear direction, and the portable cutting machine moves the dust cover in response to the movement of the intersection. Having an auxiliary cover back-and-forth movement mechanism that moves the lower end of the back-and-forth direction,
The auxiliary cover back-and-forth movement mechanism is formed in any one of both members of the angular guide and the dust cover and protrudes from the front / rear direction long hole in the front / rear direction, from the other one of the members and A portable cutting machine having a pin inserted into the longitudinal slot so as to be movable along the longitudinal slot. A portable cutting machine according to claim 6,
The angular guide is provided with a bracket to which the cutting machine body is rotatably mounted in the vertical direction,
A portable cutting machine in which the longitudinal slot is formed in the bracket. A portable cutting machine,
A cutting machine body equipped with a motor for rotating the disk-shaped cutting tool;
A fixed cover fixed to the cutting machine body so as to cover a part of the outer periphery of the disk-shaped cutting tool;
The cutting machine main body is supported upward so that the angle can be adjusted in the vertical direction, and the amount of downward projection of the disk-shaped cutting tool is adjusted, and the cutting machine main body is supported so that the angle can be adjusted in the left-right direction, and the disk shape is supported. A base that can adjust the inclination angle of the right and left direction of the blade,
An auxiliary cover movably attached to the fixed cover so as to cover the outer periphery of the disk-shaped cutting tool in the gap between the fixed cover and the base in the vicinity of the swing center in the vertical direction of the cutting machine body;
A portable cutting machine having an auxiliary cover up-and-down moving mechanism for moving the auxiliary cover with respect to the fixed cover in accordance with an angle in a vertical direction of the cutting machine body. A portable cutting machine,
A cutting machine body equipped with a motor for rotating the disk-shaped cutting tool;
A cover body attached to the main body of the cutting machine so as to cover the outer periphery of the disk-shaped cutting tool;
The cutting machine main body is supported upward so that the angle can be adjusted in the vertical direction, and the amount of downward projection of the disk-shaped cutting tool is adjusted, and the cutting machine main body is supported so that the angle can be adjusted in the left-right direction, and the disk shape is supported. It has a base that can adjust the tilt angle in the left-right direction of the blade,
The cover body tilts in the left-right direction together with the cutting machine body,
A part of the cover body is cut in conjunction with the vertical swing of the cutting machine main body so as to reduce the gap between the cover body and the base in the vicinity of the vertical swing center of the cutting machine main body. A portable cutting machine that moves up and down relative to the machine body.

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