Work equipment

Abstract

To achieve an optimal dust collection structure. [Solution] In the tabletop circular saw 10, when the head portion 50 swings from the upper limit position to the lower limit position, the dust guide 66 rotates relative to the saw cover 55 in one direction by the retraction mechanism 70. Specifically, a guide plate 72, which is configured to rotate integrally with the dust guide 66, comes into contact with the roller 86 of the retraction mechanism 70 when the head portion 50 swings, causing the dust guide 66 to rotate relative to the saw cover 55. Here, the retraction mechanism 70 is configured to adjust the rotation (movement) range of the dust guide 66, and the rotation range of the dust guide 66 is adjusted by operating the retraction mechanism 70. Specifically, the amount of relative rotation (movement) of the dust guide 66 with respect to the saw cover 55 when the head portion 50 swings is changed by the retraction mechanism 70. This makes it possible to realize a suitable dust collection structure.

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] In the table saw (working machine) described in Patent Document 1 below, chips are introduced into the housing from the suction port by cooling air and discharged from the discharge port. A filter is provided in the chip guide path between the suction port and the motor, and relatively large chips are collected in the dust collection case disposed below the filter.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above table saw has room for improvement in the following points. That is, in the table saw, the position of the suction port with respect to the circular saw blade is constant. Therefore, for example, it may not be possible to suitably collect chips corresponding to the thickness of the workpiece to be cut. In addition, in the table saw, a process of cutting by inserting the circular saw blade from the upper surface of the wood by swinging the cutting part holding the circular saw blade downward (also called a pushing cut process) and a process of cutting by sliding the cutting part in the front-rear direction after swinging the cutting part downward (also called a slide cut process) may be configured to be possible. However, in these operations, since the movement of the cutting part and the way of generating chips are different, a working machine having a suitable dust collection structure that can also cope with such different operations is desired. In addition, various functions are desired for the cutting part of the table saw, but depending on the function, the cutting part may be enlarged, which may lead to deterioration of workability (visibility, operability, etc.). Therefore, a technique for improving workability is also desired.

[0005] The present invention aims to provide a work machine that can realize a suitable dust collection structure, taking the above facts into consideration. Another objective is to provide a work machine with improved workability. [Means for solving the problem]

[0006] One or more embodiments of the present invention include a base on which a workpiece is placed, a cutting unit configured to swing up and down relative to the base, and an adjustment mechanism configured to be operable by an operator, wherein the cutting unit includes a circular saw blade for cutting the workpiece, a saw cover covering a part of the circular saw blade, a dust guide configured to be movable relative to the saw cover and guiding chips generated when cutting the workpiece into the cutting unit, and moving relative to the saw cover within a predetermined range by the swinging of the cutting unit or contact with the workpiece, and a discharge unit for discharging the chips guided into the cutting unit by the dust guide to the outside of the cutting unit, and the adjustment mechanism is configured to be able to adjust the range of movement of the dust guide, and the range of movement of the dust guide is adjusted when the adjustment mechanism is operated.

[0007] One or more embodiments of the present invention are a work machine in which the cutting section is pivotably supported by a pivoting support section, the adjustment mechanism has a support-side mechanism section provided on the pivoting support section, the support-side mechanism section includes a contact section configured to be able to directly or indirectly contact the dust guide, and an adjustment section connected to the contact section and operated to change the position of the contact section, and the dust guide moves relative to the saw cover when the cutting section pivots, by the dust guide directly or indirectly contacting the contact section.

[0008] One or more embodiments of the present invention are working machines in which the cutting section has a guide plate that moves in conjunction with the movement of the dust guide, and when the cutting section swings, the guide plate comes into contact with the contact section, causing the dust guide to move relative to the saw cover and setting the range of movement of the dust guide.

[0009] One or more embodiments of the present invention are work machines in which the guide plate is integrally movably connected to the dust guide.

[0010] One or more embodiments of the present invention are work machines in which the dust guide is fixed to a guide holder, and the guide holder is movably supported on the saw cover.

[0011] One or more embodiments of the present invention are work machines in which the guide holder has a guide wall extending along the direction of movement of the dust guide, and the guide wall constitutes the wall portion of the dust collection passage between the dust guide and the discharge section.

[0012] One or more embodiments of the present invention are working machines in which the dust guide is biased by a biasing unit to protrude downward from the saw cover.

[0013] One or more embodiments of the present invention are work machines in which the contact portion is configured as a roller.

[0014] One or more embodiments of the present invention are work machines in which the arc center of the operating trajectory of the contact portion and the arc center of the operating trajectory of the dust guide are set to be at the same position when the cutting portion is located in a predetermined position.

[0015] One or more embodiments of the present invention are work machines in which the support-side mechanism has a connecting portion that connects the adjustment portion and the contact portion, and the position of the contact portion is changed when the connecting portion is activated by an operating force applied to the adjustment portion.

[0016] One or more embodiments of the present invention are a work machine in which the adjustment part is configured to be rotatable in the left-right direction as an axial direction, and the connecting part is operated by the operating force of the adjustment part, causing the contact part to move along an arc-shaped trajectory when viewed from the left-right direction.

[0017] One or more embodiments of the present invention are a work machine in which the connecting portion is formed in an elongated shape, one end of the connecting portion is supported so as to be movable relative to a support shaft whose axial direction is in the left-right direction, the other end of the connecting portion is provided with the contact portion, and the longitudinal intermediate portion of the connecting portion is provided with a transmission portion to which the operating force from the adjustment portion is transmitted.

[0018] One or more embodiments of the present invention are working machines comprising: a base on which a workpiece is placed; a cutting section configured to swing vertically with respect to the base and having a circular saw blade arranged with the left-right direction as the thickness direction of the plate; and a swing support section configured to include a swing axis that swingably supports the cutting section with the left-right direction as the axial direction, wherein the swing axis is positioned so as to not overlap with the circular saw blade when viewed from the front-rear direction.

[0019] One or more embodiments of the present invention are work machines in which the swing support portion is supported so as to be slidable in the front-rear direction by a pair of upper and lower slide bars that extend in the front-rear direction and are spaced apart in the vertical direction, and the swing axis is located between the pair of slide bars in the vertical direction.

[0020] One or more embodiments of the present invention are work machines in which at least a portion of the oscillating shaft is positioned between a pair of upper and lower slide bars, and the oscillating shaft intersects with an overhead line connecting the axes of the pair of slide bars. [Effects of the Invention]

[0021] According to one or more embodiments of the present invention, a suitable dust collection structure can be realized. [Brief explanation of the drawing]

[0022] [Figure 1] It is a side view seen from the left showing the desktop circular saw according to this embodiment. [Figure 2] It is a cross-sectional view taken from the rear side (cross-sectional view taken along line 2-2 in FIG. 1) showing the support state of the head by the swing axis in the desktop circular saw shown in FIG. 1. [Figure 3] It is a side view seen from the left showing the positional relationship between the operating mechanism part and the dust guide unit in the desktop circular saw shown in FIG. 1 with the left case member removed. [Figure 4] It is a perspective view seen from the left obliquely forward showing the connection state between the dust guide unit and the guide plate shown in FIG. 3. [Figure 5] It is a cross-sectional view taken from the upper side (cross-sectional view taken along line 5-5 in FIG. 1) showing the inside of the saw cover shown in FIG. 1. [Figure 6] It is a cross-sectional view taken from the right side (cross-sectional view taken along line 6-6 in FIG. 5) showing the support state of the saw cover shown in FIG. 5 to the guide holder. [Figure 7] It is a cross-sectional view taken from the rear side (cross-sectional view taken along line 7-7 in FIG. 1) showing the inside of the hinge side mechanism part shown in FIG. 1. [Figure 8] It is a side view seen from the left showing the state where the head part swings downward from the upper limit position and the guide plate abuts against the roller at the first adjustment position. [Figure 9] It is a side view showing the state where the head part further swings downward from the position shown in FIG. 8 and the contact of the circular saw blade with the thick plate is started, with the guide cover and the left case member removed. [Figure 10] It is a side view showing the state where the head part further swings downward from the position shown in FIG. 9 and is arranged at the lower limit position, with the guide cover and the left case member removed. [Figure 11] It is a side view seen from the left showing the state where the head part swings downward from the upper limit position and the guide plate abuts against the roller at the second adjustment position. [Figure 12] It is a side view showing the state where the head part further swings downward from the position shown in FIG. 11 and the contact of the circular saw blade with the thin plate is started, with the guide cover and the left case member removed. [Figure 13] This is a side view showing the head unit in the lower limit position after it has swung further downward from the position shown in Figure 12, with the guide cover and left case member removed. [Figure 14] This is a side view showing the state in which the dust guide rotates from the first guide position to one side in the rotational direction as the dust guide comes into contact with the thick plate when the head part swings from its upper limit position. [Modes for carrying out the invention]

[0023] The tabletop circular saw 10, as a work machine according to this embodiment, will be described below with reference to the drawings. The arrows UP, FR, and LH shown in the drawings as appropriate indicate the top, front, and left sides of the tabletop circular saw 10, respectively. In the following description, when the directions of up and down, front and back, and left and right are used, they refer to the up and down direction, front and back direction, and left and right direction of the tabletop circular saw 10, unless otherwise specified.

[0024] As shown in Figures 1 and 2, the tabletop circular saw 10 is a device for cutting thick boards W1 and thin boards W2, which are materials to be processed from wood or other materials. The tabletop circular saw 10 consists of a base 20 and a circular saw body 30.

[0025] (Regarding Base 20) The base 20 forms the lower end of the tabletop circular saw 10 and is configured as a platform for placing thick plates W1 and thin plates W2. The base 20 has a base body 22 and a turntable 24. The base body 22 is formed in a substantially flat shape with the vertical direction being the thickness direction. A recess 22A that opens upward is formed in the left-right center of the base body 22.

[0026] The turntable 24 extends in the front-rear direction. The middle portion of the turntable 24 in the front-rear direction is housed in a recess 22A of the base body 22 and is rotatably supported by the base body 22 with the vertical direction as the axial direction. The front and rear ends of the turntable 24 protrude outward in the front-rear direction relative to the base body 22. The upper surface of the turntable 24 is arranged along a plane perpendicular to the vertical direction and is flush with the upper surface of the base body 22.

[0027] (Regarding the circular saw body 30) The circular saw body 30 is composed of a support mechanism 40, a head section 50 which serves as the cutting section, and a dust collection mechanism 60.

[0028] (Regarding the support mechanism 40) The support mechanism 40 comprises a support column 41, a pair of upper and lower slide bars 43, and a hinge base 45 as a swing support part.

[0029] The support column 41 extends in the vertical direction. The lower end of the support column 41 is connected to the rear end of the turntable 24 by a connecting mechanism 42, and the support column 41 extends upward from the turntable 24. The support column 41 is inclined to the right as it goes upward, and the upper end of the support column 41 is positioned to the right of the lower end of the support column 41.

[0030] The pair of upper and lower slide bars 43 are formed in a substantially cylindrical shape that extends in the front-rear direction. The rear ends of the slide bars 43 are fixed to the upper end of the support column 41, and the slide bars 43 extend forward from the support column 41. The front ends of the pair of upper and lower slide bars 43 are connected by a bar connecting member (not shown) that extends in the vertical direction.

[0031] The hinge base 45 is a support member that pivotably supports the head portion 50, which will be described later. When viewed from the rear, the hinge base 45 is formed in a roughly L-shaped block with the front-to-back direction as the thickness direction. The right end of the hinge base 45 is the supported portion 45A, which is supported by a pair of upper and lower slide bars 43 so as to be slidable in the front-to-back direction. This configuration allows for cutting work (slide cutting) by sliding the head portion 50. On the right side of the hinge base 45, a hinge recess 45B is formed on the left side of the supported portion 45A, opening upwards, and the hinge recess 45B penetrates in the front-to-back direction. A pivot shaft 46 for pivotably supporting the head portion 50, which will be described later, is provided inside the hinge recess 45B. The pivot shaft 46 is formed in a substantially cylindrical shape with its axis oriented in the left-right direction. The right end of the pivot shaft 46 is fixed to the supported part 45A, and the left end of the pivot shaft 46 is fixed to the left wall of the hinge recess 45B. The right end of the pivot shaft 46 is located between a pair of upper and lower slide bars 43 when viewed from the rear, and the pivot shaft 46 intersects with the overhead line L1 connecting the axes of the pair of upper and lower slide bars 43.

[0032] A projection 45C is integrally provided at the lower end of the hinge base 45, projecting to the left. A support piece 45D extending upward is provided at the left end of the projection 45C. The support piece 45D is formed in a substantially rectangular plate shape with the left-right direction being the thickness direction.

[0033] (Regarding head section 50) The head portion 50 has a head housing 51 that forms the outer casing of the head portion 50. The head housing 51 is formed in a substantially hollow, flat shape with the left-right direction as the thickness direction and extending in the front-rear direction. The rear end of the head housing 51 is housed in a hinge recess 45B of the hinge base 45 and is supported by a pivot shaft 46 so as to be able to pivot in the vertical direction. Specifically, the head portion 50 is configured to pivot between an upper limit position (the position shown in Figure 1) and a lower limit position (the position shown in Figures 10 and 13) obtained by pivoting from the upper limit position to one side in the pivoting direction (the direction of arrow A in Figure 1, which is the downward side). A hinge spring 47 is provided at the rear end of the head housing 51. The hinge spring 47 is a torsion spring and biases the head housing 51 to the other side in the pivoting direction. This holds the head portion 50 in the upper limit position. The following description assumes that the head portion 50 is positioned in the upper limit position.

[0034] The head housing 51 is provided with a motor housing 51A that protrudes to the left. A motor 52 is housed inside the motor housing 51A. A battery 53 is detachably mounted on the head housing 51 behind the motor 52, and power is supplied from the battery 53 to the motor 52. A circular saw blade 54 is provided on the head unit 50 diagonally in front of and below the motor housing 51A. The circular saw blade 54 is formed in a substantially circular disc shape with the left-right direction being the thickness direction. The central part of the circular saw blade 54 is fixed to a transmission mechanism (not shown) provided on the head unit 50. The transmission mechanism is a mechanism that transmits the driving force of the motor 52 to the circular saw blade 54, causing the circular saw blade 54 to rotate around its own axis. As a result, the circular saw blade 54 rotates in one direction in the circumferential direction (direction B in the direction of the arrow in Figure 1) around the rotation axis CL when driven by the motor 52. The circular saw blade 54 is positioned so that, when viewed from the rear, it overlaps with the protruding portion 45C of the hinge base 45 (see Figure 2). In other words, when viewed from the rear, the circular saw blade 54 is positioned to the left of the pivot axis 46, so that the circular saw blade 54 and the pivot axis 46 do not overlap.

[0035] The upper part of the circular saw blade 54 is covered by a saw cover 55. The saw cover 55 is formed in a roughly C-shape, extending along the circumferential direction (direction of rotation) of the circular saw blade 54 when viewed from the left and right, and opening diagonally downward and forward. It is also formed in a concave shape, opening radially inward of the circular saw blade 54 when viewed from its own direction of extension. Specifically, the saw cover 55 is composed of a top wall 55A whose thickness direction is the radial direction of the circular saw blade 54, a left side wall 55B extending radially inward of the circular saw blade 54 from the left end of the top wall 55A, and a right side wall 55C extending radially inward of the circular saw blade 54 from the right end of the top wall 55A. The saw cover 55 is fixed to the head housing 51.

[0036] A handle portion 56 is provided on the upper side of the saw cover 55. In a side view, the handle portion 56 is formed in a roughly inverted U shape that opens downwards, and the lower end of the handle portion 56 is connected to the saw cover 55. A trigger 57 is provided on the handle portion 56 so as to be operable. A switch (not shown) is also provided inside the handle portion 56, and the switch and motor 52 are electrically connected to a controller (not shown). When the trigger 57 is operated, the switch is turned on, and the motor 52 is driven by the controller.

[0037] A discharge section 58 is provided at the rear end of the top wall 55A of the saw cover 55. The discharge section 58 is formed in a substantially cylindrical shape with the front-to-back direction as its axial direction and extends rearward from the saw cover 55. The inside of the discharge section 58 and the inside of the saw cover 55 are in communication (see Figure 6). As shown in Figures 5, 6, 9, and 10, a guide hole 55D is formed through the left side wall 55B of the saw cover 55 in the left-to-right direction, in front of the discharge section 58. The guide hole 55D extends along the circumferential direction of the circular saw blade 54 and is formed in an arc shape that is convex diagonally upward and rearward in a side view.

[0038] (Regarding the dust collection mechanism 60) As shown in Figures 1 to 7, the dust collection mechanism 60 is composed of a dust guide unit 62, a retraction mechanism 70 as an adjustment mechanism, the discharge section 58 of the saw cover 55 mentioned above, and a dust collection bag 95 attached to the discharge section 58.

[0039] (Regarding the dust guide unit 62) The dust guide unit 62 includes a guide holder 64 and a dust guide 66. The guide holder 64 is located inside the saw cover 55. The guide holder 64 has a connecting piece 64A which acts as a guide wall. The connecting piece 64A is formed in the shape of a substantially elongated plate, with the left-right direction being the thickness direction and extending in the circumferential direction of the circular saw blade 54. The connecting piece 64A is positioned adjacent to the right side of the left side wall 55B so as to close the guide hole 55D of the saw cover 55.

[0040] A guide rib 64B is provided on the outer circumference of the connecting piece 64A, projecting to the left. The guide rib 64B extends along the longitudinal direction of the connecting piece 64A. The guide rib 64B is positioned within a guide groove 55E (see Figures 5 and 6) formed on the inner circumferential surface of the left side wall 55B of the saw cover 55. The guide groove 55E is formed in a groove shape that opens to the right and extends in the circumferential direction of the circular saw blade 54. The guide rib 64B is supported by the guide groove 55E so as to be movable in the circumferential direction of the circular saw blade 54. As a result, the guide holder 64 (dust guide unit 62) is connected to the saw cover 55 so as to be able to rotate (move) relative to it about the rotation axis CL of the circular saw blade 54. Specifically, the guide holder 64 (dust guide unit 62) is configured to be rotatable (movable) between a first guide position (the position shown in Figures 1, 3, and 6) and a second guide position (the position shown in Figure 10) which is rotated from the first guide position to one side in the rotational direction (towards the direction of arrow B in Figure 3). Hereafter, the description will assume that the guide holder 64 (dust guide unit 62) is positioned at the first guide position. The saw cover 55 is provided with a stopper wall 55F (see Figures 5 and 6) that protrudes to the left from the inner circumferential surface of the right side wall 55C. The stopper wall 55F is positioned adjacent to the right side of the connecting piece 64A, and the movement of the guide holder 64 to the right is restricted by the stopper wall 55F.

[0041] A pair of fixed bosses 64C (see Figure 4) are provided in the longitudinal middle portion of the connecting piece 64A. The fixed bosses 64C are formed in a substantially cylindrical shape with the left-right direction as the axial direction, protruding to the left from the connecting piece 64A, and are spaced apart in the longitudinal direction of the connecting piece 64A. The fixed bosses 64C are movably inserted into the guide hole 55D of the saw cover 55, and the left end (tip) of the fixed bosses 64C protrudes to the left from the saw cover 55.

[0042] In the first guide position, one fixed boss 64C is positioned at the lower end of the guide hole 55D, allowing the guide holder 64 to move in one direction in the rotational direction, while restricting its movement in the other direction in the rotational direction. In the second guide position, the other fixed boss 64C abuts against the upper end of the guide hole 55D, restricting the guide holder 64 to move in one direction in the rotational direction, while allowing it to move in the other direction in the rotational direction. In the first guide position, the extension length of the connecting piece 64A is set such that its upper part closes the lower part of the guide hole 55D. Furthermore, in the first guide position, the upper end of the guide holder 64 is located in front of the discharge section 58, so that the guide holder 64 constitutes part of the dust collection path for chips generated during cutting (see Figure 6).

[0043] A guide mounting portion 64D is integrally provided at the lower end of the guide holder 64. The guide mounting portion 64D is formed in a concave shape that opens radially inward from the circular saw blade 54 when viewed from the longitudinal direction of the guide holder 64, and the left wall of the guide mounting portion 64D is formed by a connecting piece 64A. In the first guide position, the guide mounting portion 64D protrudes downward (more specifically, diagonally downward and forward) from the lower end of the saw cover 55.

[0044] The dust guide 66 is made of an elastic material such as rubber. The dust guide 66 extends in a direction that slopes forward as it moves downward when viewed from the side, and is formed in a roughly U-shape that is open upward when viewed from the longitudinal direction. The upper part of the dust guide 66 is housed in the guide mounting portion 64D of the guide holder 64 and fixed to the guide mounting portion 64D. As a result, the front part of the dust guide 66 protrudes downward and diagonally forward from the guide mounting portion 64D. When cutting the workpiece with the circular saw blade 54, the chips blown upward from the circular saw blade 54 are guided by the dust guide 66 and flow into the saw cover 55, and the chips that have flowed into the saw cover 55 are discharged to the rear from the discharge portion 58.

[0045] (Regarding the evacuation mechanism 70) The retraction mechanism 70 is configured to retract the dust guide 66 (dust guide unit 62) into the saw cover 55 by utilizing the oscillation of the head portion 50 when the head portion 50 swings from its upper limit position, thereby rotating it relative to the saw cover 55. Furthermore, the retraction mechanism 70 is configured to change (adjust) the amount of rotation of the dust guide 66 when the head portion 50 swings from its upper limit position to its lower limit position. In other words, the retraction mechanism 70 is also configured to adjust the rotation range of the dust guide 66. The retraction mechanism 70 includes a head-side mechanism 71 provided on the head portion 50 and a hinge-side mechanism 80 as a support-side mechanism provided on the hinge base 45.

[0046] (Regarding the head-side mechanism 71) The head-side mechanism 71 includes a guide plate 72 and a return spring 74 as a biasing element. The guide plate 72 is positioned with its thickness in the left-right direction and is formed in a roughly trapezoidal frame shape when viewed from the left. The guide plate 72 is positioned to the left of the fixing boss 64C of the guide holder 64, and the rear end of the guide plate 72 is fixed to the fixing boss 64C by a fixing screw 73. This configures the guide plate 72 to rotate integrally with the guide holder 64. In other words, the guide plate 72 rotates (moves) integrally with the dust guide 66 in conjunction with the rotation (movement) of the dust guide 66.

[0047] The rear end surface of the guide plate 72 is designated as a stopper portion 72A. In a side view, the stopper portion 72A is inclined forward as it moves downward, and is formed in a roughly arc shape that convex downward and diagonally backward. The front end of the guide plate 72 is provided with a locking portion 72B that extends diagonally upward and forward. The stopper portion 72A is not a single plane, but is formed by multiple planes or curved surfaces that intersect at mutual angles, or by a combination of planes and curved surfaces.

[0048] The return spring 74 is a tension coil spring and extends in the vertical direction. The upper end of the return spring 74 is locked to the locking portion 72B of the guide plate 72, and the lower end of the return spring 74 is locked to the saw cover 55, so that the return spring 74 biases the guide plate 72 downward. As a result, the dust guide unit 62, including the guide plate 72, is held in the first guide position.

[0049] A guide cover 75 (see Figures 1, 2, and 5) is attached to the saw cover 55 to make the guide hole 55D invisible. The guide cover 75 is formed in a box shape that opens to the right and extends along the circumferential direction of the circular saw blade 54 in a side view. The front part of the guide plate 72 and the return spring 74 are housed inside the guide cover 75 and are made invisible by the guide cover 75. A cover recess 75A is formed in the opening of the guide cover 75. The guide plate 72 is inserted through the cover recess 75A, and the abutment portion 72A is positioned outside the guide cover 75.

[0050] (Regarding the hinge-side mechanism 80) As shown in Figures 1 to 3 and Figure 7, the hinge-side mechanism 80 is composed of a case 81, a link member 84 as a connecting part, and an adjustment dial 88 as an adjustment part. The case 81 constitutes the outer shell of the hinge-side mechanism 80 and is formed in a substantially hollow box shape. The case 81 has a right case member 82 that constitutes the right part of the case 81 and a left case member 83 that constitutes the left part of the case 81. The case 81 is formed by assembling the right case member 82 and the left case member 83 together. The case 81 is positioned adjacent to the left side of the support piece 45D of the hinge base 45 and is fixed to the support piece 45D. The left case member 83 is provided with a support shaft 83A (see Figure 7). The support shaft 83A is formed in a substantially cylindrical shape with its axial direction in the left-right direction and protrudes to the left from the left case member 83. As will be explained in more detail later, as shown in Figure 1, an angle indicator 83B is provided on the left side of the left case member 83.

[0051] As shown in Figure 3, the link member 84 is housed within the case 81. The link member 84 is formed in the shape of a substantially elongated plate, with the left-right direction being the thickness direction and extending in the front-rear direction. Specifically, the link member 84 is positioned so as to be slightly inclined downwards towards the front when viewed from the side. A link hole 84A is formed through the rear end of the link member 84. The link hole 84A is formed in the shape of an elongated hole along the longitudinal direction of the link member 84. A support boss 82A provided on the right case member 82 is inserted into the link hole 84A, and the support boss 82A is formed in the shape of a substantially cylindrical shape with the left-right direction being the axial direction. The rear end of the link member 84 is supported by the support boss 82A so as to be rotatable relative to it. A connecting hole 84B, which serves as a transmission part, is formed through the middle of the link member 84 in the longitudinal direction. The connecting hole 84B is formed in the shape of an elongated hole along the longitudinal direction of the link member 84.

[0052] A link shaft 85 is provided at the front end of the link member 84. The link shaft 85 is formed in a substantially cylindrical shape with its axial direction in the left-right direction and protrudes to the right from the link member 84. A roller 86 is provided at the right end of the link shaft 85 as a contact part, and the roller 86 is rotatably supported on the link shaft 85. In other words, the roller 86 is rotatably connected to the front end of the link member 84 with its axial direction in the left-right direction. The roller 86 is housed in a roller guide groove 82B formed in the right case member 82 and is configured to move along the roller guide groove 82B. In a side view, the roller guide groove 82B is inclined towards the rear as it moves downwards and is curved in an arc shape that is convex diagonally upwards and rearwards. In other words, the trajectory of the roller 86, as viewed from the left-right direction, is set to be arc-shaped. More specifically, in the state shown in Figure 10 (with the head portion 50 in the lower limit position), when viewed from the left and right directions, the arc center of the trajectory CL1 of the central axis of the roller 86 and the arc center of the trajectory CL2 of the lower end of the dust guide 66 are set to be in the same position (the rotation axis CL of the circular saw blade 54). Note that CL1 has a larger radius of curvature than CL2. Then, as the link member 84 rotates relative to the support boss 82A and the orientation of the link member 84 is changed, the roller 86 is positioned at any position between the first adjustment position located at the upper end of the roller guide groove 82B (the position shown by the solid line in Figure 3) and the second adjustment position located at the lower end of the roller guide groove 82B (the position shown by the dashed line in Figure 3).

[0053] Here, at the upper limit position of the head portion 50, in both the first adjustment position and the second adjustment position of the roller 86, the roller 86 is positioned relative to the abutment portion 72A of the guide plate 72 on one side in the direction of the swing of the head portion 50 (downward, in the direction of arrow A in Figure 3). Also, the roller 86 at the second adjustment position is positioned diagonally downward and rearward relative to the roller 86 at the first adjustment position. Therefore, the roller 86 at the second adjustment position is positioned relative to the roller 86 at the first adjustment position on one side in the direction of the swing of the head portion 50.

[0054] As will be described in more detail later, when the head portion 50 swings from the upper limit position to the lower limit position, the abutment portion 72A of the guide plate 72 comes into contact with the roller 86, causing the dust guide unit 62, including the guide plate 72, to rotate relative to the saw cover 55 in one direction of rotation, and the roller 86 to rotate in one direction of rotation (towards arrow C in Figure 8). A slit is formed in the joint between the left case member 83 and the right case member 82, and the slit allows the guide plate 72 to enter the case 81.

[0055] As shown in Figures 1, 3, and 7, the adjustment dial 88 comprises a dial base 88A and an operating knob 88B. The dial base 88A is formed in a substantially disc shape with the left-right direction being the thickness direction. The operating knob 88B is integrally formed with the dial base 88A and protrudes to the left from the dial base 88A. The operating knob 88B extends radially from the dial base 88A. The base end of the operating knob 88B is positioned in the center of the dial base 88A and is rotatably supported on the support shaft 83A of the left case member 83 (see Figure 7). The tip of the operating knob 88B protrudes radially outward from the dial base 88A.

[0056] A connecting boss 88C (see Figure 3) is integrally provided on the dial base 88A. The connecting boss 88C is formed in a substantially cylindrical shape with its axis oriented in the left-right direction and protrudes to the right from the dial base 88A. The connecting boss 88C is located inside the case 81, and its tip is movably inserted into the connecting hole 84B of the link member 84. This connects the adjustment dial 88 to the link member 84. When the adjustment dial 88 is rotated, the operating force of the adjustment dial 88 is transmitted from the connecting boss 88C to the connecting hole 84B, causing the link member 84 to rotate relative to the support boss 82A, and the roller 86 to move between the first adjustment position and the second adjustment position.

[0057] As shown in Figure 7, a detent mechanism 90 is provided between the dial base 88A and the case 81. The detent mechanism 90 comprises a detent spring 91, a plurality of detent protrusions 92, and a plurality of detent recesses 93. The detent spring 91 is a compression coil spring. The detent spring 91 is mounted on the support shaft 83A and biases the adjustment dial 88 to the right. The plurality of detent protrusions 92 are provided on the right side of the dial base 88A and are arranged in a line in the circumferential direction of the support shaft 83A. The plurality of detent recesses 93 are provided on the left case member 83 and are arranged opposite the detent protrusions 92 in the left-right direction, as well as arranged in a line in the circumferential direction of the support shaft 83A. The detent protrusions 92 are fitted into adjacent detent recesses 93. As a result, the adjustment dial 88 is held in a predetermined rotational position by the detent mechanism 90. Furthermore, when the adjustment dial 88 is rotated, the detent protrusion 92 overcomes the detent recess 93, thereby providing the adjustment dial 88 with a detent sensation (a feeling that the adjustment dial 88 has been operated by a predetermined amount, a so-called click sensation). In this embodiment, the detent sensation is provided every 12 degrees the adjustment dial 88 is rotated. As shown in Figure 1, an angle display section 83B is provided on the left side of the left case member 83. The angle display section 83B is a wide, arc-shaped portion. Eleven angles are printed on the angle display section 83B. Specifically, the angle display section 83B has markings for 50mm, 45mm, 40mm, 35mm, 30mm, 25mm, 20mm, 18mm, 15mm, 12mm, and 9mm. On the other hand, an arrow 88D is engraved on the left side of the adjustment dial 88, and the operator can determine the adjustment status of the hinge-side mechanism 80 by determining which angle on the angle indicator unit 83B this arrow points to. Furthermore, the aforementioned tactile sensation is generated at the point corresponding to the displayed angle on the angle indicator unit 83B, thereby allowing the operator to easily determine the adjustment status of the hinge-side mechanism 80.Although the angle intervals indicated on the angle display section 83B are uneven, the adjustment dial 88 is set to provide a sense of tactile feedback every 12 degrees of rotation. The reason the angles are uneven is that the abutment section 72A is not a flat surface, but is formed by multiple planes, curved surfaces, or a combination of planes and curved surfaces that intersect at mutual angles. This configuration of the abutment section 72A allows for easy adjustment of the lower limit position of the dust guide 66 corresponding to the rotation position of the adjustment dial 88. Furthermore, since the guide plate 72 is detachable from the dust guide 66, it is easy to meet diverse needs by replacing it with a guide plate 72 of a different shape.

[0058] As shown in Figures 1 and 2, the dust collection bag 95 is formed in the shape of a roughly rectangular hollow bag, with the left-right direction being the thickness direction and the front-back direction being the longitudinal direction. The dust collection bag 95 is positioned behind the discharge portion 58 of the saw cover 55 and above the protruding portion 45C of the hinge base 45. A bag attachment portion 95A is provided at the front end of the dust collection bag 95. The bag attachment portion 95A is formed in the shape of a roughly cylindrical shape. The dust collection bag 95 is attached to the discharge portion 58 by inserting the discharge portion 58 into the bag attachment portion 95A.

[0059] (Effects and Benefits) Next, the operation and effects of this embodiment will be explained while describing the operation of the tabletop circular saw 10 during cutting.

[0060] (Regarding cutting processes for relatively thick plate W1) As shown in Figure 1, during the cutting process of the thick plate W1, the adjustment dial 88 is rotated to position the roller 86 in the first adjustment position. Before cutting the thick plate W1, the head portion 50 is positioned in the upper limit position, and the dust guide 66 is positioned in the first guide position, protruding downward from the saw cover 55. In this state, the operator grasps the handle portion 56 and swings the head portion 50 downward from the upper limit position. As shown in Figure 8, in the first adjustment position of the roller 86, at the initial stage of the swing of the head portion 50, the upper end of the abutment portion 72A of the guide plate 72 comes into contact with the roller 86. As a result, the displacement of the guide plate 72 in one direction of swing is limited by the roller 86, and a reaction force R acts from the roller 86 on the guide plate 72 in the other direction of swing.

[0061] Here, at the first guide position of the dust guide 66, rotation of the guide plate 72 in one direction of rotation is permitted, while rotation of the guide plate 72 in the other direction of rotation is restricted. Therefore, when the head portion 50 is swung downward with the abutment portion 72A of the guide plate 72 in contact with the roller 86, the reaction force R causes the guide plate 72 to rotate relative to the saw cover 55 in one direction of rotation (see arrow B in Figure 8) against the biasing force of the return spring 74, and the roller 86 also rotates in one direction of rotation (see arrow C in Figure 8). As a result, the guide plate 72 (dust guide 66) rotates in one direction of rotation in conjunction with the swinging of the head portion 50, and the dust guide 66 is retracted into the saw cover 55. In other words, the dust guide 66 is pushed into the saw cover 55 by the retraction mechanism 70.

[0062] As shown in Figure 9, when the head unit 50 is swung to a position where the outer circumference of the circular saw blade 54 contacts the upper surface of the thick plate W1, the dust guide 66 is further retracted into the saw cover 55, and the lower end (tip) of the dust guide 66 is positioned close to the upper side of the thick plate W1. When the head unit 50 is swung further downward and cutting of the thick plate W1 by the circular saw blade 54 begins, the chips blown upward from the lower end of the circular saw blade 54 are guided by the dust guide 66 and flow into the saw cover 55. The chips that have flowed into the saw cover 55 are discharged into the dust collection bag 95 from the discharge unit 58.

[0063] As shown in Figure 10, when the head unit 50 is swung to its lower limit position, the dust guide 66, including the guide plate 72, is positioned at the second guide position. At the second guide position, the amount of retraction of the dust guide 66 into the saw cover 55 is maximized, and the gap between the lower end (tip) of the dust guide 66 and the thick plate W1 in the vertical direction becomes larger than the state shown in Figure 9. When the cutting process of the thick plate W1 is complete, the head unit 50 is returned to the upper limit position. This releases the contact between the guide plate 72 and the roller 86, and the dust guide unit 62 rotates to the other side of the rotational direction by the biasing force of the return spring 74, returning to the first guide position. In Figure 10, the movement of the chips guided to the discharge section 58 is represented by dashed arrows. Note that the movement of the chips shown by the dashed arrows is approximate and actually varies depending on factors such as the rotational speed of the circular saw blade 54, the material (specific gravity) and shape of the thick plate W1.

[0064] (Regarding cutting processes for thin sheet metal W2, which is relatively thin) In the cutting process for the thin sheet W2, the roller 86 is positioned in the second adjustment position by rotating the adjustment dial 88. As described above, before cutting the thin sheet W2, the head unit 50 is positioned in the upper limit position and the dust guide 66 is positioned in the first guide position. Then, the operator swings the head unit 50 downwards from the upper limit position. Here, the roller 86 in the second adjustment position is located on one side of the swinging direction of the head unit 50 compared to the roller 86 in the first adjustment position. Therefore, compared to when the roller 86 is positioned in the first adjustment position, the abutment portion 72A of the guide plate 72 contacts (strikes) the roller 86 when the head unit 50 has swung toward the lower limit position. Specifically, as shown in Figure 11, in the later stages of the swing of the head unit 50, the vertically intermediate portion of the abutment portion 72A strikes the roller 86. Furthermore, in this case, as described above, the displacement of the guide plate 72 to one side in the direction of oscillation is limited by the roller 86, and a reaction force R acts from the roller 86 on the guide plate 72 to the other side in the direction of oscillation.

[0065] When the head portion 50 is further swung downward, as described above, the reaction force R causes the guide plate 72 to move relative to the saw cover 55 in one direction of rotation (towards arrow B in Figure 11) against the biasing force of the return spring 74, and the roller 86 also rotates in one direction of rotation. In other words, compared to the cutting process of the thick plate W1, the retraction of the dust guide 66 into the saw cover 55 begins when the head portion 50 has swung to the lower limit position. In other words, the timing of the start of rotation of the guide plate 72 (dust guide 66) is delayed compared to the cutting process of the thick plate W1.

[0066] As shown in Figure 12, when the head 50 is swung to a position where the outer circumference of the circular saw blade 54 contacts the upper surface of the thin plate W2, the dust guide 66 is further retracted into the saw cover 55, and the lower end (tip) of the dust guide 66 is positioned closer to the upper side of the thin plate W2. In other words, even when cutting the thin plate W2, the dust guide 66 is brought closer to the upper side of the thin plate W2, and the cutting process to the thin plate W2 is started. To put it another way, when cutting the thin plate W2, the amount the dust guide 66 is retracted into the saw cover 55 is smaller compared to when cutting the thick plate W1, and the cutting process to the thin plate W2 is started. Then, as described above, when the head 50 is swung further downward and the circular saw blade 54 cuts the thin plate W2, the chips blown upward from the lower end of the circular saw blade 54 are guided by the dust guide 66 and flow into the saw cover 55. The chips that flow into the saw cover 55 are discharged into the dust collection bag 95 from the discharge section 58.

[0067] As shown in Figure 13, when the head portion 50 is swung to its lower limit position, the dust guide 66 rotates further, and the gap between the lower end (tip) of the dust guide 66 and the thin plate W2 in the vertical direction becomes larger than the state shown in Figure 12. As a result, in the tabletop circular saw 10 of this embodiment, by changing the amount of rotation of the dust guide 66, which rotates in conjunction with the swinging of the head portion 50, using the retraction mechanism 70, it is possible to perform cutting with the dust guide 66 closer to the upper side of the workpiece, even when the thickness of the workpiece is different.

[0068] As explained above, in the tabletop circular saw 10, when the head 50 swings from the upper limit position to the lower limit position, the retraction mechanism 70 causes the dust guide 66 to rotate relative to the saw cover 55 in one direction. Specifically, a guide plate 72, which is configured to rotate integrally with the dust guide 66, comes into contact with the roller 86 of the retraction mechanism 70 when the head 50 swings, causing the dust guide 66 to rotate relative to the saw cover 55. Here, the retraction mechanism 70 is configured to adjust the rotation (movement) range of the dust guide 66, and the rotation range of the dust guide 66 is adjusted by operating the retraction mechanism 70. Specifically, the amount of relative rotation (movement) of the dust guide 66 relative to the saw cover 55 when the head 50 swings is changed by the retraction mechanism 70. This makes it possible to realize a suitable dust collection structure.

[0069] In other words, if the retraction mechanism 70 is designed to fix the roller 86 in the first adjustment position, then when the head 50 swings, most of the dust guide 66 is always retracted into the saw cover 55. As a result, when cutting thin plates W2, the vertical distance between the dust guide 66 and the thin plate W2 becomes longer. This can prevent the dust guide 66 from effectively guiding the chips into the saw cover 55, potentially reducing the dust collection performance for chips. On the other hand, if the retraction mechanism 70 is designed to fix the roller 86 in the second adjustment position, then in the later stages of the head 50's swing, the dust guide 66 is retracted into the saw cover 55, and the amount of retraction of the dust guide 66 into the saw cover 55 decreases. As a result, when cutting thick plates W1, the dust guide 66 interferes with the thick plate W1 and undergoes significant elastic deformation. In this case as well, the guiding function of the dust guide 66 for chips may decrease, potentially reducing the dust collection performance for chips.

[0070] In contrast, in the tabletop circular saw 10 of this embodiment, as described above, the retraction mechanism 70 allows the amount of relative rotation (movement) of the dust guide 66 with respect to the saw cover 55 during the oscillation of the head 50 to be changed. This allows the amount of relative rotation of the dust guide 66 with respect to the saw cover 55 to be increased (the range of movement is widened) during the oscillation of the head 50, so that most of the dust guide 66 can be retracted into the saw cover 55 so that it does not interfere with the thick plate W1. As a result, during the cutting of the thick plate W1, interference of the dust guide 66 with the thick plate W1 can be suppressed while bringing the dust guide 66 closer to the upper side of the thick plate W1. In particular, during slide cutting, depending on the amount of protrusion of the dust guide 66, the rear surface of the dust guide 66 may come into contact with the thick plate W1, causing the dust guide 66 to bend instead of moving upward, which may affect the dust collection performance. However, by adjusting the range of movement of the dust guide 66, it is possible to address such problems. Furthermore, when cutting thin sheets W2, the relative rotation amount of the dust guide 66 with respect to the saw cover 55 during the oscillation of the head portion 50 can be reduced (the range of movement can be narrowed), thereby reducing the amount the dust guide 66 retracts into the saw cover 55. In other words, when cutting thin sheets W2, the amount of protrusion of the dust guide 66 from the saw cover 55 can be ensured. As a result, even when cutting thin sheets W2, the dust guide 66 can be brought closer to the upper side of the thin sheet W2. Thus, the tabletop circular saw 10 of this embodiment can realize a suitable dust collection structure.

[0071] Furthermore, the hinge-side mechanism 80 of the retraction mechanism 70 includes a roller 86 configured to be in contact with the guide plate 72, and an adjustment dial 88 for changing the position of the roller 86. Therefore, by operating the adjustment dial 88, the roller 86 can be changed to any position between the first adjustment position and the second adjustment position, allowing cutting of workpieces of different thicknesses to be performed.

[0072] Furthermore, the dust guide 66 is attached to the guide mounting portion 64D of the guide holder 64, and the guide holder 64 is connected to the saw cover 55 so as to be rotatable relative to it. In other words, the guide holder 64 and the dust guide 66 are made of separate components. For this reason, for example, the dust guide 66 can be made of an elastic material and the guide holder 64 can be made of a resin material or the like. This makes it possible to prevent damage to the dust guide 66 by elastically deforming it even if the dust guide 66 comes into contact with the workpiece during cutting. Also, by making the guide holder 64 of a resin material or the like, the connection between the dust guide 66 and the saw cover 55 can be improved.

[0073] Furthermore, the guide holder 64 has a connecting piece 64A that extends along the rotational direction of the dust guide 66. The connecting piece 64A is positioned between the dust guide 66 and the discharge section 58 and constitutes the wall portion of the dust collection passage in the saw cover 55. This allows the connecting piece 64A, which connects the dust guide 66 to the saw cover 55, to guide the chips guided into the saw cover 55 by the dust guide 66 towards the discharge section 58.

[0074] Furthermore, in the retraction mechanism 70, the roller 86 is rotatably supported on the link shaft 85. When the head portion 50 swings, the abutment portion 72A of the guide plate 72 comes into contact with the roller 86. As a result, when the guide plate 72 comes into contact with the roller 86, the roller 86 is made to roll, allowing the dust guide 66, including the guide plate 72, to rotate smoothly from the first guide position to one side in the rotational direction.

[0075] Furthermore, in the retraction mechanism 70, the link member 84 is connected to the adjustment dial 88, and the roller 86 is rotatably supported on the link shaft 85 of the link member 84. When the adjustment dial 88 is rotated, the posture of the link member 84 is changed, and the roller 86 is positioned at any position between the first adjustment position and the second adjustment position. This improves the workability when setting the relative rotation amount of the dust guide 66 when the head portion 50 swings.

[0076] Furthermore, the arc center of the trajectory CL1 of the central axis of the roller 86 and the arc center of the trajectory CL2 of the lower end of the dust guide 66 are set to be at the same position (the rotation axis CL of the circular saw blade 54). Note that CL1 has a larger radius of curvature than CL2. This allows the guide cover 75 and the case 81 to be positioned so as not to interfere with each other, thus enabling a more compact design for the mechanism.

[0077] Furthermore, when viewed from the front or rear, the pivot axis 46 is positioned so as not to overlap with the circular saw blade 54. This allows the discharge unit 58 and the dust collection bag 95 to be positioned behind the circular saw blade 54 while avoiding interference between the discharge unit 58 and the dust collection bag 95 and the pivot axis 46. As a result, the sawdust blown upward from the circular saw blade 54 can be efficiently collected in the dust collection bag 95.

[0078] Furthermore, the pivot axis 46 is positioned between the pair of upper and lower slide bars 43. In other words, assuming that the pair of upper and lower slide bars 43 are located on a hypothetical plane extending in the front-back and up-down directions (a plane parallel to the overhead line L1), the pivot axis 46 extends in a direction perpendicular to and intersects with this hypothetical plane. Therefore, compared to a structure in which the pivot axis 46 is positioned below the pair of upper and lower slide bars 43 (hereinafter referred to as the comparative example structure), the workability when swinging the head 50 downwards from the upper limit position can be improved. That is, in the comparative example structure, since the pivot axis 46 is below the slide bars 43, the vertical distance between the handle 56, which is located above the pivot axis 46, and the pivot axis 46 becomes longer. Therefore, when swinging the head 50 downwards from the upper limit position, the handle 56 is displaced downwards and forwards (see arrow E in Figure 1). That is, the handle 56 approaches the operator located in front of the tabletop circular saw 10. Therefore, the workability when the head portion 50 is oscillating may deteriorate. In contrast, in this embodiment, the oscillating shaft 46 is positioned between a pair of upper and lower slide bars 43. This allows the vertical distance between the oscillating shaft 46 and the handle portion 56 to be shortened. As a result, when the head portion 50 is oscillating downwards from the upper limit position, the handle portion 56 is displaced approximately downwards (see arrow D in Figure 1). Furthermore, after the handle portion 56 is positioned below the oscillating shaft 46, the handle portion 56 is displaced diagonally downwards and backwards. This allows the operator to cut the workpiece while pushing the handle portion 56 backwards. As a result, the workability when oscillating the head portion 50 downwards from the upper limit position can be improved. In addition, by utilizing the space between the pair of upper and lower slide bars 43, which was not previously used, it becomes easier to adopt, for example, a larger oscillating shaft 46, making it easier to improve durability and precision.

[0079] In this embodiment, in order to suppress contact of the dust guide 66 with the workpiece during cutting with the tabletop circular saw 10, the retraction mechanism 70 pushes the guide plate 72 and retracts the dust guide 66 into the saw cover 55 when the head portion 50 swings. However, the workpiece may also push the dust guide 66 into the saw cover 55 and retract it. For example, as shown in Figure 14, the roller 86 may be positioned in the second adjustment position when cutting the thick plate W1. In this case, when the head portion 50 swings from the upper limit position, the lower end of the dust guide 66 contacts the upper surface of the thick plate W1, and the reaction force from the thick plate W1 causes the dust guide 66 to rotate relative to the saw cover 55 in one direction. This allows the dust guide 66 to be positioned adjacent to the upper side of the thick plate W1 when cutting the thick plate W1.

[0080] Furthermore, in this embodiment, the guide holder 64, the dust guide 66, and the guide plate 72 are configured as separate components, but they may be formed as a single unit, with the dust guide 66 being a single component including the guide holder 64 and the guide plate 72.

[0081] Furthermore, although this embodiment is configured to accommodate both push-cutting and slide-cutting as described in the problem, if only slide-cutting is to be considered, the dust guide 66 may be configured to be fixed in a desired position according to the work style (so that it does not move due to contact with material, etc.). To realize such a configuration, for example, the guide plate 72 may be configured to be detachably engaged with the guide cover 75, and in the engaged state, the guide plate 72 may be fixed to the guide cover 75.

[0082] Furthermore, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. [Explanation of symbols]

[0083] 10. Tabletop circular saw (working equipment) 20 base 43 Slide bar 45. Hinge base (rocking support part) 50 Head section (cutting section) 54 Circular saw blades 55 Soap cover 58 Discharge section 64 Guide holder 64A Connecting piece (guide wall) 66 Dust Guide 70 Evacuation mechanism (adjustment mechanism) 72 Guide Plate 74. Return spring (biasing part) 80. Hinge-side mechanism (support-side mechanism) 82B Roller guide groove 83A Support shaft 84 Link member (connecting part) 84B Connecting hole (transmission section) 86 Roller (contact part) 88 Adjustment dial (adjustment part) W1 Thick Plate (Processed Material) W2 Thin plate (processed material) L1 overhead line

Claims

1. A base on which the workpiece is placed, A cutting section configured to swing up and down relative to the base, An adjustment mechanism configured to be operable by an operator, Equipped with, The aforementioned cut portion is A circular saw blade for cutting the aforementioned workpiece, A saw cover that covers a portion of the circular saw blade, A dust guide is configured to be movable relative to the saw cover, guides chips generated during cutting of the workpiece into the cutting section, and moves relative to the saw cover within a predetermined range due to the oscillation of the cutting section or contact with the workpiece. A discharge unit that discharges the chips guided into the cutting section by the dust guide to the outside of the cutting section, It consists of, The adjustment mechanism is configured to allow adjustment of the range of movement of the dust guide, and the range of movement of the dust guide is adjusted by operating the adjustment mechanism.

2. The cutting portion is supported so as to be swingable by a swinging support portion, The adjustment mechanism has a support-side mechanism provided on the swing support portion, The support side mechanism is, A contact portion configured to be able to directly or indirectly contact the dust guide, An adjustment unit connected to the aforementioned contact portion and operated to change the position of the aforementioned contact portion, It is composed of including, The work machine according to claim 1, wherein the dust guide directly or indirectly contacts the contact portion when the cutting portion swings, causing the dust guide to move relative to the saw cover.

3. The cutting section has a guide plate that moves in conjunction with the movement of the dust guide. The work machine according to claim 2, wherein when the cutting portion swings, the guide plate comes into contact with the contact portion, causing the dust guide to move relative to the saw cover and setting the range of movement of the dust guide.

4. The work machine according to claim 3, wherein the guide plate is integrally movably connected to the dust guide.

5. The work machine according to claim 1, wherein the dust guide is fixed to a guide holder, and the guide holder is movably supported on the saw cover.

6. The work machine according to claim 5, wherein the guide holder has a guide wall extending along the direction of movement of the dust guide, and the guide wall constitutes the wall portion of the dust collection passage between the dust guide and the discharge section.

7. The work machine according to claim 1, wherein the dust guide is biased by the biasing part in a direction that protrudes downward from the saw cover.

8. The work machine according to claim 2, wherein the contact portion is configured as a roller.

9. The work machine according to claim 2, wherein the arc center of the operating trajectory of the contact portion and the arc center of the operating trajectory of the dust guide are set to be the same position when the cutting portion is in a predetermined position.

10. The support mechanism has a connecting portion that connects the adjustment portion and the contact portion. The work machine according to claim 2, wherein the position of the contact portion is changed by the operation of the connecting portion by the operating force applied to the adjustment portion.

11. The adjustment unit is configured to be rotatable in the left-right direction as its axial direction. The work machine according to claim 10, wherein the connecting part is activated by the operating force of the adjustment part, and the contact part moves along an arc-shaped trajectory when viewed from the left and right directions.

12. The aforementioned connecting portion is formed in an elongated shape, One end of the connecting portion is supported so as to be movable relative to a support shaft whose axial direction is in the left-right direction, and the other end of the connecting portion is provided with the contact portion. The work machine according to claim 11, wherein a transmission unit is provided in the longitudinal intermediate portion of the connecting unit, to which the operating force from the adjustment unit is transmitted.

13. A base on which the workpiece is placed, A cutting section having a circular saw blade that is configured to swing up and down relative to the base and is arranged with the left-right direction as the plate thickness direction, A swing support part is configured to include a swing axis that swings and supports the cutting portion with the left-right direction as the axial direction, Equipped with, A work machine in which the pivot axis is positioned so as not to overlap with the circular saw blade when viewed from the front or rear direction.

14. The swing support portion is supported so as to be slidable in the front-rear direction by a pair of upper and lower slide bars that extend in the front-rear direction and are spaced apart in the vertical direction. The work machine according to claim 13, wherein the pivot axis is located between a pair of slide bars in the vertical direction.

15. The work machine according to claim 14, wherein at least a portion of the pivot shaft is positioned between a pair of upper and lower slide bars, and the pivot shaft intersects an overhead line connecting the axes of the pair of slide bars.

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