Work machine

Abstract

The present invention suppresses a decrease in workability. In a tilting mechanism (60) of a circular saw (10), a front tilting mechanism part (70) is configured to include a front tilting plate (72) connected to a circular saw body (20) and a front guide (71) for guiding rotation of the front tilting plate (72), and a rear tilting mechanism part (80) is configured to include a rear tilting plate (82) connected to the circular saw body (20) and a rear guide (81) for guiding rotation of the rear tilting plate (82). When the disk saw body (20) tilts (rotates) from the standing position to the tilting position, the disk saw body (20) is entirely separated from the base (12) along the side surface of the disk saw blade (14) by the front guide (71) and the rear guide (81). As a result, even if the disk saw body (20) is tilted from the raised position, downward displacement of the washer member (16) for connecting the disk saw blade (14) and the output shaft (44) can be suppressed.

Description

Technical Field

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

[0002] In the portable cutting machine (working machine) described in Patent Document 1 below, a main body having a circular saw blade is rotatably supported on a base by a tilting mechanism around a connecting member (a rotating shaft extending in the front-rear direction). Thus, by the operation of an operator, the main body is tilted relative to the base, and thereby the angle of the cutting surface of a workpiece can be changed. Further, a working machine corresponding to a member (guide rail) for assisting straight cutting is disclosed in Patent Document 2 below. The working machine of Patent Document 2 also has the same tilting mechanism as the working machine of Patent Document 1, but does not have a rotating shaft as a mechanical structure, and has an imaginary rotating shaft (tilting shaft V). The tilting shaft V of Patent Document 2 is imaginary because, in order to cope with cutting at the guide rail, it is necessary to set the tilting shaft at a position below the lower surface of the base. Further, in the working machine of Patent Document 2, the workability is improved by aligning the position of the imaginary tilting shaft with the end of the guide rail.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: WO 2017 / 187894

[0006] Patent Document 2: JP 2017-196853 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] Herein, when the main body is tilted, according to the position of the rotation center axis when the main body is tilted, a washer member, which is a holding member for holding the circular saw blade on the main body, is displaced downward. Therefore, in the non-tilting state (right angle state) of the main body, it is necessary to separate the washer member upward from the workpiece to some extent so that the workpiece or the like does not interfere with the washer member when the main body is tilted. However, in this case, the cutting depth into the workpiece in the non-tilting state becomes small, and the workability of the portable cutting machine may be reduced.

[0009] On the other hand, by setting the rotation center axis during tilting of the main body to be on the left side of the circular saw blade when viewed from the front side, the washer member is displaced upward when the main body tilts. Therefore, interference between the workpiece and the washer member during tilting of the main body can be suppressed. However, in this case, the cutting depth of the workpiece also becomes smaller, and the workability of the portable cutting machine may be reduced. In addition, depending on the type of work machine, there are work machines configured to be tiltable in the opposite direction. In this case, the washer member is configured to be displaced downward in the tilted state, but the washer member is displaced upward in the reverse tilted state. Therefore, the cutting depth becomes smaller during reverse tilting. Additionally, as another problem, tilting requires relative movement between the base and the main body, and the base and the main body need to be formed in a shape that does not hinder this relative movement. For example, in a work machine, the workability is sometimes improved by auxiliary functions such as a lighting device and a blowing mechanism. However, when these auxiliary functions are to be arranged at highly effective positions, their arrangement hinders the tilting (relative movement) and the mechanical structure of the tilting mechanism. Therefore, they sometimes have to be arranged at positions lacking effectiveness. As a result, the workability is reduced. Additionally, as another problem, in the case of a structure in which tilting is performed by the movement of a guide shaft inside a guide groove as described in Patent Document 1, if the guide groove and the guide shaft come into excessive contact, smooth tilting becomes difficult, and in this case, the workability is reduced.

[0010] In view of the above facts, an object of the present invention is to provide a work machine capable of suppressing a reduction in workability.

[0011] Means for solving the problems

[0012] One or more embodiments of the present invention are a work machine, comprising: a main body having: a motor; and an output shaft that rotates in the left-right direction and is driven by the motor; a circular saw blade that can be integrally rotatably connected to the output shaft and extends in the front-rear direction; a washer member for holding the circular saw blade on the output shaft; a base disposed below the main body and having an insertion portion through which the circular saw blade is inserted; and a tilting mechanism configured to be able to change the main body from a non-tilting state in which the output shaft extends in the left-right direction to a tilting state in which the main body tilts by a predetermined angle to one side in the left-right direction. The tilting mechanism has: a guiding member provided on one of the main body and the base and having a guiding portion; and a guided portion provided on the other of the main body and the base, which operates inside the guiding portion and is guided by the guiding portion. It is configured that in either the non-tilting state or the tilting state, an imaginary axis extending in the front-rear direction and located below the washer member overlaps with the circular saw blade. It is configured that in an imaginary state in which the main body in the non-tilting state is rotated by the predetermined angle about the imaginary axis, at least a part of the washer member is located below the lower surface of the base. And when changing from the non-tilting state to the tilting state, the tilting mechanism causes the washer member to operate at a position above the lower surface of the base.

[0013] One or more embodiments of the present invention are a work machine, in at least one of the non-tilting state and the tilting state, at least a part of the washer member is located inside the insertion portion.

[0014] One or more embodiments of the present invention are a work machine, the guiding portion is formed in an arc shape, and the radius of curvature of the guiding portion is set to increase at least in part.

[0015] One or more embodiments of the present invention are a work machine, a pair of the guiding portions are formed on the guiding member, and one of the guiding portions is located radially outside the other guiding portion.

[0016] One or more embodiments of the present invention are a work machine, the guided portion includes a pair of guide shafts with the front-rear direction as the axis, and the guide shafts are respectively movably inserted into the pair of guiding portions.

[0017] One or more embodiments of the present invention are a work machine, the guide shafts are formed in a cylindrical shape.

[0018] One or more embodiments of the present invention are a working machine, in which a bearing member is provided on the guided portion, and the bearing member is movably inserted into the guiding portion.

[0019] One or more embodiments of the present invention are a working machine, in which a pair of guiding portions and a pair of guided portions are respectively provided, and the pair of guided portions are respectively arranged so as to be separated in a direction orthogonal to the front-rear direction, and the bearing member is provided on at least one side of the pair of guided portions that is located outside in the direction orthogonal to the front-rear direction.

[0020] One or more embodiments of the present invention are a working machine, in which a pair of guiding portions and a pair of guided portions are respectively provided, the guiding portion is formed in an arc shape, a fixing hole different from the guiding portion and in an arc shape is formed in the guiding member, the tilting mechanism has: a fixing shaft inserted through the fixing hole; and a fixing member provided at the front end of the fixing shaft and operated by an operator, and by operating the fixing member, the operator can allow or restrict the tilting of the main body portion relative to the base, and the fixing hole is configured to be located between the pair of guiding portions in a direction orthogonal to the front-rear direction.

[0021] One or more embodiments of the present invention are a working machine, in which the tilting mechanism has a restricting member configured to be rotatable about the axis, and the restricting member is configured to guide the movement of the main body portion in a manner that allows relative movement in a predetermined direction with respect to the restricting member.

[0022] One or more embodiments of the present invention are a working machine, in which a restricting hole extending in a direction intersecting the extending direction of the output shaft is formed in the restricting member, a part of the main body portion is inserted through the restricting hole, and the restricting member and the main body portion are engaged in the extending direction of the output shaft, thereby restricting the relative movement of the main body portion with respect to the restricting member in a direction intersecting the predetermined direction.

[0023] One or more embodiments of the present invention are a working machine, in which the restricting member is made of a material having a higher mechanical strength than the guiding member, or is configured to be impregnated with lubricating oil, or is formed by sintering.

[0024] One or more embodiments of the present invention are a work machine, comprising: a main body having: a motor; and an output shaft that rotates by driving of the motor; a disc saw blade that can be integrally rotatably connected to the output shaft; a washer member for holding the disc saw blade on the output shaft; a base disposed below the main body and having a through-hole through which the disc saw blade passes; and a tilting mechanism that can tilt the main body relative to the base from a non-tilted state to a tilted state tilted by 45 degrees, and a lower end position of the washer member in the tilted state is located at the same position as or above a lower end position of the washer member in the non-tilted state.

[0025] One or more embodiments of the present invention are a work machine, comprising: a main body having: a motor; and an output shaft that rotates by driving of the motor; a disc saw blade that can be integrally rotatably connected to the output shaft; a base disposed below the main body and having a through-hole through which the disc saw blade passes; and a tilting mechanism that can tilt the main body relative to the base from a non-tilted state to a tilted state tilted by 45 degrees. The disc saw blade is connected to the output shaft via a washer member, and is configured such that an intersection portion of a horizontal plane that is located below the washer member and parallel to a lower surface of the base and the disc saw blade is located at substantially the same position when the main body is in the non-tilted state and when the main body is in the tilted state, and a difference between a lower end position of the washer member in the non-tilted state and a lower end position of the washer member in the tilted state in the vertical direction is equal to or less than a vertical distance between a lower end of the washer member in the non-tilted state and the lower surface of the base.

[0026] One or more embodiments of the present invention are a work machine, comprising: a main body having: a motor; and an output shaft that rotates by driving of the motor; a disc saw blade that can be integrally rotatably connected to the output shaft; a base disposed below the main body and having a through-hole through which the disc saw blade passes; and a tilting mechanism that can tilt the main body relative to the base from a non-tilted state to a tilted state. The disc saw blade is connected to the output shaft via a washer member, and is configured such that an intersection portion of a horizontal plane that is located below the washer member and parallel to a lower surface of the base and the disc saw blade is located at substantially the same position when the main body is in the non-tilted state and when the main body is in the tilted state, and when the main body is tilted from the non-tilted state to the tilted state, a lower end of the washer member continuously moves upward or downward.

[0027] Advantages of the Invention

[0028] According to one or more embodiments of the present invention, it is possible to suppress a reduction in workability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a plan view showing the circular saw of the present embodiment as viewed from above.

[0030] Figure 2 It is from Figure 1 A side view as viewed from the right side of the circular saw shown.

[0031] Figure 3 It is from the front side showing Figure 2 A cross-sectional view of the inside of the circular saw shown ([ Figure 2 Cross-sectional view taken along line 3-3).

[0032] Figure 4 It is showing to make Figure 3 A cross-sectional view taken from the front side showing the state where the circular saw main body is tilted to the tilting position.

[0033] Figure 5 It is showing Figure 1 A plan view showing the tilting mechanism shown.

[0034] Figure 6 It is Figure 5 An exploded perspective view of the front tilting mechanism in the tilting mechanism shown as viewed from the left rear oblique side.

[0035] Figure 7 It is Figure 5 An exploded perspective view of the front tilting mechanism in the tilting mechanism shown as viewed from the right front oblique side.

[0036] Figure 8 It is Figure 5 An exploded perspective view of the rear tilting mechanism in the tilting mechanism shown as viewed from the right front oblique side.

[0037] Figure 9 It is showing Figure 2 A cross-sectional view of the inside of the front tilting mechanism part as viewed from the rear side ([ Figure 2 Cross-sectional view taken along line 9-9).

[0038] Figure 10 It is a cross-sectional view corresponding to Figure 9 when tilting the circular saw main body to the tilting position and showing the inside of the front tilting mechanism part.

[0039] Figure 11 (A) It is showing Figure 2 A cross-sectional view of the inside of the rear tilting mechanism part as viewed from the front side ([ Figure 2Cross-sectional view taken along line 11A-11A), and (B) is a cross-sectional view corresponding to (A) showing the inside of the rear tilting mechanism portion when the circular saw main body is tilted to the tilting position. Detailed implementation mode

[0040] Hereinafter, the circular saw 10 as a working machine of the present embodiment will be described with reference to the drawings. In addition, the arrows UP, FR, and RH appropriately shown in the drawings respectively indicate the upper side, front side, and right side of the circular saw 10. In the following description, when the directions of up and down, front and back, and left and right are used for description, unless otherwise specified, they represent the up and down direction, front and back direction, and left and right direction of the circular saw 10.

[0041] As Figure 1 And Figure 2 shown, the circular saw 10 is configured as a power tool for cutting workpieces. The circular saw 10 is configured to include a base 12 and a circular saw main body 20 as a main body portion. In addition, the circular saw 10 has a tilting mechanism 60 that tiltably connects the circular saw main body 20 to the base 12. Hereinafter, each structure of the circular saw 10 will be described.

[0042] (Regarding the base 12)

[0043] As Figures 1 to 5 shown, the base 12 is made of metal and is formed in a substantially rectangular plate shape with the up and down direction as the plate thickness direction and the front and back direction as the length direction. During the cutting process of the circular saw 10, the base 12 is placed on the workpiece, and the base 12 is moved forward. A through-hole 12A for arranging the circular saw blade 14 is formed through the right part of the base 12. The through-hole 12A is formed in a substantially rectangular shape with the front and back direction as the length direction and is a through-hole having a width in the up and down direction. Among them, the circular saw blade 14 is formed in a substantially circular plate shape with the left and right direction as the plate thickness direction, and the central portion of the circular saw blade 14 can be integrally rotatably fixed to the output shaft 44 of the drive mechanism 40 described later. A part of the circular saw blade 14 is arranged in the through-hole 12A, the upper part of the circular saw blade 14 protrudes upward from the base 12, and the lower end side part of the circular saw blade 14 protrudes downward from the base 12 (the lower surface 12C of the base). A engaging portion 12B corresponding to the guide rail shown in the patent document is provided on the base 12. That is, the circular saw 10 is configured to correspond to the guide rail.

[0044] (Regarding the circular saw main body 20)

[0045] As Figures 1 to 3 shown, the circular saw main body 20 is configured to include a housing 22, a battery 32, and a drive mechanism 40.

[0046] (Regarding the housing 22)

[0047] The housing 22 is composed of a plurality of housing components, forms the outer contour of the circular saw main body 20, and is disposed above the base 12. The housing 22 is configured to include: a saw guard 24 that covers the circular saw blade 14; a motor housing 26 that houses a drive mechanism 40 described later; and a battery holder 28 to which a battery 32 is attached.

[0048] The saw guard 24 forms the right end portion of the housing 22. The saw guard 24 is formed in a substantially semi-circular plate shape that bulges upward with the left-right direction as the thickness direction, and is formed in a concave shape that opens downward. The upper part of the circular saw blade 14 is received in the saw guard 24 and covered by the saw guard 24.

[0049] The saw guard 24 is connected to the base 12 via a tilting mechanism 60 by a cutting depth adjustment mechanism 30. Specifically, the front end portion of the saw guard 24 is connected to the front end portion of the tilting mechanism 60 by a front side connecting mechanism 30A of the cutting depth adjustment mechanism 30, and the rear end portion of the saw guard 24 is connected to the rear end portion of the tilting mechanism 60 by a rear side connecting mechanism 30B of the cutting depth adjustment mechanism 30. Thus, the circular saw main body 20 is connected to the base 12. A guard connecting portion 24A is provided on the left side portion of the saw guard 24. The guard connecting portion 24A is formed in a substantially cylindrical shape with the left-right direction as the axis, and protrudes leftward from the saw guard 24.

[0050] The motor housing 26 is integrally formed in a substantially box shape that opens to the right. The motor housing 26 is disposed on the left side of the guard connecting portion 24A of the saw guard 24 and is fastened and fixed to the guard connecting portion 24A at a position not shown.

[0051] The battery holder 28 extends rearward from the upper part of the motor housing 26. The battery 32 is attached to the battery holder 28 from the rear side, and the battery 32 is disposed below the battery holder 28 and behind the motor housing 26. The battery 32 is electrically connected to a controller (not shown) and a motor 42 of a drive mechanism 40 described later.

[0052] A handle portion 28A is provided on the upper side of the battery holder 28. The handle portion 28A is formed in a substantially U-shaped that opens obliquely downward and forward when viewed from the right side. The front end portion of the handle portion 28A is connected to the motor housing 26, and the rear end portion of the handle portion 28A is connected to the battery holder 28. A trigger 34 is provided on the handle portion 28A so as to be able to perform a trigger operation. By performing a trigger operation (pressing operation) on the trigger 34, a switch (not shown) housed inside the handle portion 28A is pressed. This switch is electrically connected to the controller, and according to the operation of the trigger 34, the drive mechanism 40 described later operates.

[0053] (Regarding the drive mechanism 40)

[0054] As Figure 3As shown, the drive mechanism 40 is configured to include a motor 42 and an output shaft 44. The motor 42 is configured as a brushless motor, housed within the motor housing 26, and electrically connected to the controller. The motor 42 has a rotating shaft 42A with an axial direction in the left - right direction. The rotating shaft 42A is rotatably supported by a motor bearing (not shown) fixed to the motor housing 26. A pinion gear is formed at the right - end portion of the rotating shaft 42A.

[0055] The output shaft 44 has an axial direction in the left - right direction, is disposed below the right - end portion of the rotating shaft 42A, and is disposed within the cover connection portion 24A of the saw cover 24. The left - end portion of the output shaft 44 is rotatably supported by a metal bearing 46 fixed to the cover connection portion 24A, and the middle portion of the output shaft 44 in the left - right direction is rotatably supported by a bearing 48 fixed to the cover connection portion 24A. An output gear 50 is integrally rotatably provided at the middle portion of the output shaft 44 in the left - right direction, and the output gear 50 is connected to the pinion gear of the rotating shaft 42A through a transmission mechanism portion (not shown).

[0056] Moreover, the central portion of the disc saw blade 14 is fixed to the right - end portion of the output shaft 44 by a fixing bolt 52. Specifically, the central portion of the disc saw blade 14 is clamped from the outer sides in the left - right direction by a washer member 16 which is a holding member for holding the disc saw blade 14, and the washer member 16 is fixedly fastened to the output shaft 44 by the fixing bolt 52. Thus, when the motor 42 is driven, the output shaft 44 and the disc saw blade 14 rotate about the axial side of the output shaft 44. In addition, the lower end portion of the washer member 16 is located within the insertion portion 12A of the base 12 (within the vertical width range of the insertion portion 12A).

[0057] In addition, the lower portion of the disc saw blade 14 is covered by a protective cover 54. The protective cover 54 is formed in a substantially semi - circular shape protruding downward when viewed from the right side, and is formed in a concave shape opening upward. In addition, the protective cover 54 is connected to the output shaft 44 so as to be rotatable about the axis of the output shaft 44. And the protective cover 54 is biased about the axis of the output shaft 44 by a biasing spring (not shown), so as to be held in Figure 2 the shown position. Moreover, it is configured that when cutting is performed using the disc saw 10, the protective cover 54 rotates about the axis of the output shaft 44 against the acting force of the biasing spring by the workpiece, and the cutting edge portion of the disc saw blade 14 is exposed.

[0058] (Regarding the tilting mechanism 60)

[0059] As Figure 1 、 Figure 2 、 Figures 5 to 11As shown, the working machine of the present embodiment has a tilting mechanism 60 that changes the relative position of the circular saw main body 20 and the base 12 to tilt (dump) the circular saw blade 14 relative to the base 12. Specifically, through the tilting mechanism 60, the circular saw main body 20 is configured to be able to rotate between an upright position (non-tilting position, Figures 1 to 3 the position shown) and a tilting position ( Figure 4 the position shown) that is tilted approximately 45 degrees to the right from the upright position. The tilting mechanism 60 is configured such that, when the portion where the circular saw blade 14 (left side surface) intersects the horizontal plane GB in the non-tilting state (right angle state) is set as the axis AL, the circular saw main body 20 can be tilted relative to the base 12 so that the position of the axis AL does not change. In addition, the lower surface of the rail that can be installed is configured to be on the same plane as the horizontal plane GB. That is, when performing a cutting operation using the rail, the position where the axis AL intersects the circular saw blade 14 and the upper surface of the workpiece is substantially the same. The axis AL is not an axis that actually exists as an object like the imaginary tilting axis shown in Patent Document 2. In appearance, the tilting mechanism 60 can be said to be a mechanism that rotatably connects the circular saw main body 20 to the base 12 with an overhead (imaginary) axis AL (refer to Figures 9 to 11 ) extending in the front-rear direction as the center, but the position of the axis AL (the intersection portion of the circular saw blade 14 and the horizontal plane GB) relative to the circular saw main body 20 changes relatively as it tilts (details will be described later).

[0060] As Figure 5 shown, the tilting mechanism 60 is provided on the upper side of the base 12 from the front portion to the rear portion. The tilting mechanism 60 is configured to include a front tilting mechanism portion 70 that constitutes the front end portion of the tilting mechanism 60 and a rear tilting mechanism portion 80 that constitutes the rear end portion of the tilting mechanism 60, and connects the front tilting mechanism portion 70 and the rear tilting mechanism portion 80 so that the front tilting mechanism portion 70 and the rear tilting mechanism portion 80 work simultaneously.

[0061] (Regarding the front tilting mechanism portion 70)

[0062] As Figures 5 to 7 , Figure 9 and Figure 10 shown, the front tilting mechanism portion 70 is configured to include a front guide member 71 as a guiding member, a front tilting plate 72 as a movable member, and a front link 78 as a limiting member.

[0063] (Regarding the front guide member 71)

[0064] The front guide member 71 is made of metal (aluminum in this embodiment), and is integrally formed into a substantially rectangular plate shape with the front-rear direction as the thickness direction. At the lower end portion of the front guide member 71, a guide member fixing portion 71A protruding outward in the left-right direction is provided. Further, the front guide member 71 is separately disposed on the front side of the saw cover 24, and the guide member fixing portion 71A is fastened and fixed to the base 12 by a fixing screw SC1. In a rear view observed from the rear side, the upper surface of the front guide member 71 is curved and inclined upward as it faces the right side. In addition, the axis AL is located below the right portion of the front guide member 71.

[0065] On the rear surface of the front guide member 71, a storage recess 71B for storing a front link 78 described later is formed. The storage recess 71B is formed in a concave shape that opens to the rear side, and extends along the rotation direction of the circular saw main body 20 (refer to Figure 9 and Figure 10 the arrow A direction and the arrow B direction) in a rear view, and is curved and inclined upward as it faces the right side. The right end portion of the storage recess 71B is open to the right side, and the left end portion of the storage recess 71B is open to the left and obliquely downward side.

[0066] On the rear surface of the front guide member 71, an inner guide groove 71C serving as a guide groove for guiding an inner guide shaft 73 described later is formed at a radially inner portion of the storage recess 71B. The inner guide groove 71C is formed in a groove shape that opens to the rear side. The inner guide groove 71C extends in a curved shape (arc shape) along the rotation direction of the circular saw main body 20 in a rear view. As will be described in detail later, the inner guide groove 71C is configured such that the curvature (radius of curvature) changes in at least a part thereof. That is, in Figure 9 the non-tilting state (right angle state) shown, the radius of curvature of the inner guide groove 71C centered on the axis AL is set to increase as it goes from the lower end portion (one end portion in the length direction, also the left end portion) to the upper end portion (the other end portion in the length direction, also the right end portion) of the inner guide groove 71C. The end surface 71C1 of the lower end portion of the inner guide groove 71C is inclined toward one side in the length direction of the inner guide groove 71C as it faces the rear side (the opening side of the inner guide groove 71C).

[0067] On the rear surface of the front guide member 71, an outer guide groove 71D serving as a guide groove for guiding a later-described outer guide shaft 74 is formed radially outside the storage recess 71B and radially outside the inner guide groove 71C. The outer guide groove 71D is formed in a groove shape that opens rearward. Further, when viewed from the rear side, the outer guide groove 71D extends in a manner parallel to the inner guide groove 71C. The outer guide groove 71D is curved into a substantially arc shape centered on the axis AL. As will be described in detail later, the outer guide groove 71D is configured such that the curvature (radius of curvature) changes in at least a part. That is, the radius of curvature of the outer guide groove 71D centered on the axis AL is set to increase as it goes from the lower end portion (one end portion in the longitudinal direction, also the left end portion) of the outer guide groove 71D toward the upper end portion (the other end portion in the longitudinal direction, also the right end portion). In addition, the groove width of the outer guide groove 71D is set to be wider than the groove width of the inner guide groove 71C. Moreover, the end face 71D1 of the lower end portion of the outer guide groove 71D is inclined toward one side in the longitudinal direction of the outer guide groove 71D as it goes toward the rear side (the opening side of the outer guide groove 71D).

[0068] In the front guide member 71, a fixing hole 71E is formed to penetrate between the inner guide groove 71C and the outer guide groove 71D. The fixing hole 71E is a hole through which a later-described fixing shaft 76 is inserted. The fixing hole 71E extends in a manner parallel to the inner guide groove 71C and the outer guide groove 71D when viewed from the rear. The radius of curvature of the fixing hole 71E is set to increase as it goes from the lower end portion of the fixing hole 71E toward the upper end portion.

[0069] In Figure 9 and Figure 10 respectively show the center position of the outer guide shaft 74, i.e., point CA1, the center position of the inner guide shaft 73, i.e., point CB1, and the center position of the fixing shaft 76, i.e., point CC1, in a right angle state (when not tilted). Further, similarly, the center position of the outer guide shaft 74, i.e., point CA2, the center position of the inner guide shaft 73, i.e., point CB2, and the center position of the fixing shaft 76, i.e., point CC2, in a tilted state (45-degree tilt state) are respectively shown. And, an arc TA that is the orbit of the center position of the outer guide shaft 74, an arc TB that is the orbit of the center position of the inner guide shaft 73, and an arc TC that is the orbit of the center position of the fixing shaft 76 are shown. The arcs TA, TB, and TC respectively show a manner of being consistent with a part of an arc (elliptical arc) of a predetermined ellipse. In addition, the center positions of the outer guide shaft 74, the inner guide shaft 73, and the fixing shaft 76 move between point CA1, point CB1, point CC1 and point CA2, point CB2, point CC2, but in Figure 9 , Figure 10In this case, the arcs (TA, TB, TC) that form the tracks are depicted with an overtravel. As shown in the figure, the arc TA becomes an arc that gradually separates from the axis AL (radially). That is, as described above, the arc TA becomes an arc that starts from CA1 and has a gradually increasing radius of curvature (decreasing curvature). The same applies to the arcs TB and TC. The arcs TA, TB, and TC are also lines that connect the center positions in the width direction (radial direction) in the respective guide grooves 71C, 71D, and 71E.

[0070] In Figure 9 And 10, as comparative examples (conventional examples) with respect to the points CA2, CB2, CC2, the arc TA, the arc TB, and the arc TC, the points CA′, CB′, CC′, the arc TA′, the arc TB′, and the arc TC′ are shown. The points CA′, CB′, CC′ are the center positions of the outer guide shaft 74, the inner guide shaft 73, and the fixed shaft 76 in the tilting state when the radius of curvature of each guide groove (71C, 71D, 71E) is constant. The arcs TA′, TB′, TC′ are the tracks through which the center positions of the outer guide shaft 74, the inner guide shaft 73, and the fixed shaft 76 pass when the radius of curvature of each guide groove (71C, 71D, 71E) is constant. The arcs TA′, TB′, TC′ are parallel to each other and each represent the same way as a part of an arc of a perfect circle centered on a predetermined axis AL. The point CA2, which is the end position of the outer guide shaft 74, is located above the point CA′. That is, the position of the guide shaft in the tilting state is located higher than before. As shown in the figure, the arcs TA, TB, and TC are longer than the conventional arcs TA′, TB′, and TC′. Therefore, in the case of adopting the present invention (a structure in which the guide groove is an arc with a gradually increasing radius of curvature), the front guide member 71 may be larger than before.

[0071] In Figure 9 And Figure 10 The straight lines L1 and L2 passing through the axis AL are shown. The straight line L1 is inclined at an angle of 45 degrees with respect to the left - right direction (up - down direction). In addition, the straight line L2 extends parallel to the up - down direction. That is, the straight line L1 intersects the straight line L2 at an angle of 45 degrees. When the circular saw main body 20 is in the upright position (right - angle state), when viewed from the rear, the points CA1, CB1, and CC1 are located on the straight line L1. In addition, as shown in the figure, when the circular saw main body 20 is in the tilting state (45 - degree tilting state), the center positions of the outer guide shaft 74, the inner guide shaft 73, and the fixed shaft 76, which were conventionally on the straight line L2, are respectively in positions shifted upward and to the right.

[0072] In Figure 9The vertical distance S1 between the lower end of the washer member 16 and the lower surface of the base 12 in the erected position (right-angled state) is shown. And, in Figure 10 in addition to the distance S1, the vertical distance S2 between the lower end of the washer member 16 and the lower surface of the base 12 in the tilted state (45-degree tilted state) is also shown. And, in Figure 9 , Figure 10 the axis AL (the intersection point of the circular saw blade 14 and the horizontal plane GB) corresponding to each state is described, but in Figure 10 in, Figure 9 the position of the axis AL relative to the circular saw main body 20 in the state of Figure 9 is described as AL'. In addition, in Figure 9 the position of the washer member 16 in the state (imaginary state) where the circular saw main body 20 in the erected position (erected state) is tilted 45 degrees around the axis AL relative to the base 12 is shown as the imaginary position 16' by a dashed line. That is, the imaginary position 16' is the position of the washer member 16 in the tilted state when the imaginary tilt axis is fixed as in the past. In other words, the imaginary position 16' is the position of the washer member 16 in the tilted state when the radius of curvature of each guide groove (71C, 71D, 71E) is constant. That is, in the present embodiment, the cutting depth in the erected position is set such that in the case of the existing structure (the imaginary tilt axis is fixed), at least a part of the washer member 16 is located below the lower surface 12C of the base in the tilted state. In addition, in the present embodiment, in order to cope with cutting using a guide rail, the intersection part (axis AL) of the circular saw blade 14 and the horizontal plane GB does not change in the erected position and the tilted position. In other words, it is configured such that at any of the erected position and the tilted position, a part of the circular saw blade 14 passes through the imaginary axis (axis AL). Therefore, in the tilted position, when viewed from the rear, the position where the circular saw blade 14 intersects the lower surface 12C of the base moves in the direction in which the circular saw main body 20 tilts (right side direction). By changing the radius of curvature of each of the above-mentioned guide grooves (71C, 71D, 71E), as the circular saw main body 20 moves from the erected position (non-tilted state) to the tilted position, the circular saw main body 20 moves away from the base 12 along the plane direction of the circular saw blade 14. As a result, the position of the axis AL relative to the circular saw main body 20 changes in the erected position and the tilted position. Specifically, as Figure 10 shown, the axis AL in the tilted position becomes a position farther from the washer member 16 (the center of the circular saw blade 14) than the axis AL' in the erected state. Therefore, the cutting depth changes in the erected position and the tilted position. In Figure 9 , Figure 10In the structure shown, the cutting depth is large in the erected position and small in the tilted position. That is, according to the present embodiment, it is configured such that, based on the shape of the guide groove, the cutting depth is changed by guiding the guide shaft by the guide groove. Specifically, it is configured such that by adjusting the radius of curvature of the guide groove, the cutting depth becomes shallower according to the tilting operation (the protruding amount of the circular saw blade 14 protruding downward from the lower surface 12C of the base decreases). In the present embodiment, the distance S2 is configured to be larger than the distance S1. Specifically, the distance S1 is 1 mm and the distance S2 is 1.5 mm. Therefore, it is 0.5 mm larger than the distance S1. In other words, the movement amount of the lower end position of the washer member 16 accompanying the tilting is 0.5 mm, which is an amount equal to or less than the distance S1. Thus, the lower end of the washer member 16 is configured to gradually move upward from the lower surface 12C of the base 12 as it tilts. Further, during the transition from the erected state to the tilted state, the lower end position of the washer member 16 does not move downward. That is, in the present embodiment, during the transition from the erected state to the tilted state, the lower end position of the washer member 16 is configured to continuously move upward. The movement amount of the lower end position of the washer member 16 accompanying the tilting is preferably equal to or less than the vertical interval (distance S1) between the lower end position of the washer member 16 in the erected position (non-tilted state) and the lower surface 12C of the base. By configuring it in this way, as shown in the imaginary position 16' of Figure 9 if it is an existing structure (fixed imaginary axis), even if the cutting depth in the erected state is increased so that a part of the washer member 16 is located below the lower surface 12C of the base during tilting, the washer member 16 can operate within a range above the lower surface 12C of the base.

[0073] (Regarding the front tilting plate 72)

[0074] The front tilting plate 72 is made of metal (aluminum in the present embodiment). The front tilting plate 72 is formed in a substantially long plate shape with the front-rear direction as the plate thickness direction and extending along the rotation direction of the circular saw main body 20, and is disposed adjacent to the rear side of the front guide member 71. A plate fixing portion 72A that rises one level backward is formed at a substantially central portion on the rear surface of the front tilting plate 72, and the plate fixing portion 72A is fastened and fixed to the front side connecting mechanism 30A in the cutting depth adjusting mechanism 30. Thereby, the front tilting plate 72 is connected to the front end portion of the circular saw main body 20.

[0075] On the radially inner portion of the front tilting plate 72, an inner guide shaft 73 serving as a guide shaft is provided at a position corresponding to the inner guide groove 71C of the front guide member 71. The inner guide shaft 73 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction. The rear end portion of the inner guide shaft 73 is press-fitted into the shaft hole 72B formed in the front tilting plate 72, and the inner guide shaft 73 protrudes forward from the front tilting plate 72. The diameter of the inner guide shaft 73 is set to be slightly smaller than the groove width of the inner guide groove 71C. The front end portion of the inner guide shaft 73 is movably inserted into the inner guide groove 71C and is disposed within the lower end portion of the inner guide groove 71C. Thus, when the circular saw main body 20 rotates between the erected position and the tilting position, the inner guide shaft 73 is guided by the inner guide groove 71C. In addition, at the tilting position of the circular saw main body 20, the inner guide shaft 73 is disposed within the upper end portion of the inner guide groove 71C.

[0076] On the radially outer portion of the front tilting plate 72, an outer guide shaft 74 serving as a guide shaft is provided at a position corresponding to the outer guide groove 71D of the front guide member 71. The outer guide shaft 74 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction and has the same shape as the inner guide shaft 73. The rear end portion of the outer guide shaft 74 is press-fitted into the shaft hole 72C formed in the front tilting plate 72, and the outer guide shaft 74 protrudes forward from the front tilting plate 72. A cylindrical bearing member 75 is provided at the front end portion of the outer guide shaft 74, and the bearing member 75 is configured as a ball bearing. The diameter of the bearing member 75 is set to be slightly smaller than the groove width of the outer guide groove 71D. The bearing member 75 is movably inserted into the outer guide groove 71D and is disposed within the lower end portion of the outer guide groove 71D. Thus, it is configured that when the circular saw main body 20 rotates between the erected position and the tilting position, the outer guide shaft 74 (bearing member 75) is guided by the outer guide groove 71D. In addition, at the tilting position of the circular saw main body 20, the outer guide shaft 74 (bearing member 75) is disposed within the upper end portion of the outer guide groove 71D. The outer guide shaft 74 and the inner guide shaft 73 are the guide shafts in the present invention and are an example of the guided portion.

[0077] On the front tilting plate 72, a fixed shaft 76 is provided between the inner guide shaft 73 and the outer guide shaft 74. The fixed shaft 76 is provided between the inner guide shaft 73 and the outer guide shaft 74 in the radial direction (direction orthogonal to the front-rear direction) centered on the axis AL. The fixed shaft 76 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction. The rear end portion of the fixed shaft 76 is non-rotatably connected to the front tilting plate 72, and the fixed shaft 76 protrudes forward from the front tilting plate 72. The diameter of the fixed shaft 76 is set to be smaller than the width dimension of the fixing hole 71E. The fixed shaft 76 is inserted through the lower end portion of the fixing hole 71E, and the front end portion of the fixed shaft 76 protrudes forward from the front guide member 71. A fixing rod 77 serving as a substantially long fixing member is provided at the front end portion of the fixed shaft 76 (refer toFigure 1 and Figure 2 ) One end of the fixing rod 77 is threadedly engaged with the threaded portion formed on the outer peripheral portion of the front end of the fixed shaft 76. Thus, by fastening the fixing rod 77 to the front guide member 71, the forward tilting plate 72 is fixed to the front guide member 71.

[0078] In addition, a plate connecting portion 72D for connecting the rear tilting plate 82 and the forward tilting plate 72 of the rear tilting mechanism portion 80 described later is integrally provided at the lower end portion of the left portion of the forward tilting plate 72. That is, the forward tilting plate 72 and the rear tilting plate 82 are formed of an inseparable single member. The plate connecting portion 72D is formed in a substantially long plate shape with the vertical direction as the thickness direction and the front-rear direction as the length direction, and extends rearward from the forward tilting plate 72.

[0079] (Regarding the front link 78)

[0080] The front link 78 is made of sintered metal (iron in the present embodiment), and lubricating oil is impregnated in the front link 78. That is, the front link 78 is made of a material having a higher mechanical strength than the front guide member 71. The front link 78 is formed in a plate shape with the front-rear direction as the plate thickness direction and extends along the rotation direction of the circular saw main body 20, and is movably accommodated in the accommodation recess 71B of the front guide member 71. Specifically, the radially outer surface of the front link 78 is disposed close to the radially inner side of the upper inner peripheral surface of the accommodation recess 71B, and the radially inner surface of the front link 78 is disposed close to the radially outer side of the lower inner peripheral surface of the accommodation recess 71B. Among them, the upper inner peripheral surface of the accommodation recess 71B and the lower inner peripheral surface of the accommodation recess 71B are in the form of a part of an arc of a perfect circle centered on the axis AL (the intersection point of the circular saw blade 14 and the horizontal plane GB). Thus, the front link 78 is rotatably connected to the front guide member 71 about the axis AL, and when the front tilting mechanism portion 70 operates, the front link 78 rotates about the axis AL while being guided by the accommodation recess 71B. For the purpose of durability and lubrication, the front link 78 is made of sintered metal, but as long as these problems are small, it may be formed of other materials such as resin.

[0081] A pair of link holes 78A serving as restriction holes are formed through the front link 78. The link holes 78A are holes penetrating in the front-rear direction. In addition, the link holes 78A are formed in an elongated hole shape with the vertical direction (the direction intersecting the extending direction of the output shaft 44) as the length direction (extending along the direction intersecting the extending direction of the output shaft 44). The width dimension of the link holes 78A is set to be slightly larger than the diameters of the inner guide shaft 73 and the outer guide shaft 74. The link holes 78A are respectively arranged at positions corresponding to the inner guide shaft 73 and the outer guide shaft 74, and the middle portions in the front-rear direction of the inner guide shaft 73 and the outer guide shaft 74 are inserted into the lower portions of the link holes 78A. Thus, with the inner guide shaft 73 and the outer guide shaft 74 engaged with the link holes 78A in the left-right direction, the front link 78 is connected to the front tilting plate 72. In addition, as described above, during the rotation between the erected position and the tilting position of the circular saw main body 20, it is configured such that the circular saw main body 20 approaches and separates from the base 12 along the side surface of the circular saw blade 14. Therefore, the inner guide shaft 73 and the outer guide shaft 74 relatively move along the length direction of the link holes 78A within the link holes 78A.

[0082] An insertion hole 78B is formed through the front link 78 between the pair of link holes 78A. The insertion hole 78B is formed in an elongated hole shape with the vertical direction as the length direction. The width dimension of the insertion hole 78B is set to be larger than the diameter of the fixed shaft 76. The insertion hole 78B is arranged at a position corresponding to the fixed shaft 76, and the middle portion in the front-rear direction of the fixed shaft 76 is inserted into the lower portion of the insertion hole 78B. Moreover, during the rotation between the erected position and the tilting position of the circular saw main body 20, the fixed shaft 76 relatively moves along the length direction of the insertion hole 78B with respect to the insertion hole 78B.

[0083] (Regarding the rear tilting mechanism portion 80)

[0084] As Figure 5 、 Figure 8 and Figure 11 shown, the rear tilting mechanism portion 80 is arranged at the rear side of the saw cover 24 and is configured to reverse the front tilting mechanism portion 70 in the front-rear direction. That is, the rear tilting mechanism portion 80 is configured to include a rear guide member 81 as a guide member, a rear tilting plate 82 as a movable member, and a rear link 88 as a restricting member. And the rear tilting plate 82 is arranged at the front side of the rear guide member 81, and the rear link 88 is arranged between the rear guide member 81 and the rear tilting plate 82.

[0085] (Rear guide member 81)

[0086] The rear guide member 81 is made of metal (aluminum in this embodiment) and is configured substantially the same as the structure after the front guide member 71 is reversed in the front-rear direction. That is, the rear guide member 81 is formed in a plate shape with the front-rear direction as the thickness direction, and the guide member fixing portion 81A provided at the lower end portion of the rear guide member 81 is fastened and fixed to the base 12 by fixing screws SC2. A storage recess 81B is formed on the front surface of the rear guide member 81, and in the front view observed from the front side, the storage recess 81B extends along the rotation direction of the circular saw main body 20.

[0087] In addition, an inner guide groove 81C and an outer guide groove 81D, which are guide grooves opening forward, are formed on the front surface of the rear guide member 81. The inner guide groove 81C and the outer guide groove 81D are bent in a substantially arc shape centered on the axis AL in the erected state, similarly to the inner guide groove 71C and the outer guide groove 71D. In addition, the curvature radius of each of the inner guide groove 81C and the outer guide groove 81D is set to increase as it goes from its lower end portion (which is one end portion in the length direction and also the left end portion) to its upper end portion (which is the other end portion in the length direction and also the right end portion). The end surface 81C1 of the lower end portion of the inner guide groove 81C is inclined toward one side in the length direction of the inner guide groove 81C as it goes toward the front side (the opening side of the inner guide groove 81C), and the end surface 81C2 of the upper end portion of the inner guide groove 81C is inclined toward the other side in the length direction of the inner guide groove 81C as it goes toward the front side. In addition, the end surface 81D1 of the lower end portion of the outer guide groove 81D is inclined toward one side in the length direction of the outer guide groove 81D as it goes toward the front side (the opening side of the outer guide groove 81D). In addition, in the rear guide member 81, the groove widths of the inner guide groove 81C and the outer guide groove 81D are set to the same size.

[0088] In addition, a fixing hole 81E is formed through the front surface of the rear guide member 81. The fixing hole 81E is disposed between the inner guide groove 81C and the outer guide groove 81D, and similarly to the fixing hole 71E, is bent in a substantially arc shape centered on the axis AL so as to be parallel to the inner guide groove 81C and the outer guide groove 81D in the front view, and the curvature radius of the fixing hole 81E is set to increase as it goes from the lower end portion to the upper end portion. The characteristics and effects of the curvature radius of the guide groove in the rear guide member 81 are the same as those of the front guide member 71, so detailed description is omitted.

[0089] (Regarding the rear tilting plate 82)

[0090] The rear tilting plate 82 is made of metal (aluminum in this embodiment) in the same manner as the rear guide member 81. The rear tilting plate 82 is formed in a substantially trapezoidal plate shape with the front-rear direction as the plate thickness direction. At the lower end portion of the front surface of the rear tilting plate 82, a plate fixing portion 82A that rises one level forward is formed, and the plate fixing portion 82A is fastened and fixed to the rear connecting mechanism 30B in the cutting depth adjusting mechanism 30. Thus, the rear tilting plate 82 is connected to the rear end portion of the circular saw main body 20.

[0091] Similar to the front tilting plate 72, an inner guide shaft 83 as a guide shaft, an outer guide shaft 84 as a guide shaft, and a fixing shaft 86 are provided on the rear tilting plate 82, and the inner guide shaft 83, the outer guide shaft 84, and the fixing shaft 86 project rearward from the rear tilting plate 82. The inner guide shaft 83 and the outer guide shaft 84 have the same shape as the inner guide shaft 73 and the outer guide shaft 74 of the front tilting plate 72. Also, the inner guide shaft 83 is press-fitted into a shaft hole 82B formed in the rear tilting plate 82, and the rear end portion of the inner guide shaft 83 is movably inserted into the inner guide groove 81C and is disposed inside the lower end portion of the inner guide groove 81C. In addition, the outer guide shaft 84 is press-fitted into a shaft hole 82C formed in the rear tilting plate 82, and the rear end portion of the outer guide shaft 84 is movably inserted into the outer guide groove 81D and is disposed inside the lower end portion of the outer guide groove 81D. Further, at the tilting position of the circular saw main body 20, the inner guide shaft 83 is disposed at the upper end portion of the inner guide groove 81C, and the outer guide shaft 84 is disposed at the upper end portion of the outer guide groove 81D. The outer guide shaft 84 and the inner guide shaft 83 are guide shafts in the present invention and are an example of a guided portion.

[0092] The fixing shaft 86 is inserted through the lower end portion of the fixing hole 81E, and the rear end portion of the fixing shaft 86 projects rearward from the rear guide member 81. A fixing knob 87 as a fixing member is provided at the rear end portion of the fixing shaft 86 (see Figure 1 and Figure 2 ), and the fixing knob 87 is screwed to a threaded portion formed on the outer peripheral portion of the rear end of the fixing shaft 86. Thus, by fastening the fixing knob 87 to the rear guide member 81, the rear tilting plate 82 is fixed to the rear guide member 81.

[0093] In addition, the plate fixing portion 82A of the rear tilting plate 82 projects leftward from the rear tilting plate 82, and the rear end portion of the plate connecting portion 72D of the front tilting plate 72 is connected to the plate fixing portion 82A. Thus, the rear tilting plate 82 is connected to the front tilting plate 72.

[0094] (Regarding the rear link 88)

[0095] Similar to the front link 78, the rear link 88 is made of sintered metal (iron in this embodiment), and lubricating oil is impregnated in the rear link 88. The rear link 88 is formed in a plate shape with the front-rear direction as the plate thickness direction and extending along the rotation direction of the circular saw main body 20, and is movably housed in the housing recess 81B of the rear guide member 81. That is, similar to the front link 78, the rear link 88 is rotatably connected to the rear guide member 81 about the axis AL, and when the rear tilting mechanism portion 80 operates, the rear link 88 is guided by the housing recess 81B and rotates about the axis AL.

[0096] Similar to the front link 78, a pair of link holes 88A and insertion holes 88B, which are limiting holes, are formed through the rear link 88. The link holes 88A and the insertion holes 88B are formed in elongated hole shapes with the up-down direction as the length direction. The link holes 88A are respectively arranged at positions corresponding to the inner guide shaft 83 and the outer guide shaft 84 of the rear tilting plate 82, and the middle portions in the front-rear direction of the inner guide shaft 83 and the outer guide shaft 84 are inserted into the lower portions of the link holes 88A. Thus, in a state where the inner guide shaft 83 and the outer guide shaft 84 are engaged with the link holes 88A in the left-right direction, the rear link 88 is connected to the rear tilting plate 82. In addition, the insertion holes 88B are arranged at positions corresponding to the fixed shaft 86, and the middle portion in the front-rear direction of the fixed shaft 86 is inserted into the lower portion of the insertion hole 88B.

[0097] Among them, as Figures 9 to 11 shown, the axis AL is located at a position lower than the base 12, and the position of the axis AL in the left-right direction is substantially the same as the position of the circular saw blade 14 (washer member 16) in the erected position (refer to Figure 9)。In addition, as described above, the radii of curvature of the inner guide groove 71C and the outer guide groove 71D (inner guide groove 81C and outer guide groove 81D) of the front guide member 71 (rear guide member 81) are set to increase as going from the lower end portion toward the upper end portion. Further, the inner guide shaft 73 (inner guide shaft 83) is disposed at the lower end portion of the inner guide groove 71C (inner guide groove 81C), and the outer guide shaft 74 (outer guide shaft 84) is disposed at the lower end portion of the outer guide groove 71D (outer guide groove 81D). And when the disk saw main body 20 is tilted from the upright position to the tilting position by the tilting mechanism 60, the inner guide shaft 73 (inner guide shaft 83) moves upward along the inner guide groove 71C (inner guide groove 81C), and the outer guide shaft 74 (outer guide shaft 84) moves upward along the outer guide groove 71D (outer guide groove 81D). Therefore, it is set that when the disk saw main body 20 is tilted from the upright position toward the tilting position side, the disk saw main body 20 relatively moves upward with respect to the base 12. In addition, the radii of curvature of the inner guide groove 71C and the outer guide groove 71D of the front guide member 71 and the radii of curvature of the inner guide groove 81C and the outer guide groove 81D of the rear guide member 81 are set such that the amount of relative upward movement of the disk saw main body 20 with respect to the base 12 caused by the front tilting mechanism portion 70 and the amount of relative upward movement of the disk saw main body 20 with respect to the base 12 caused by the rear tilting mechanism portion 80 are the same amount.

[0098] More specifically, in the upright position, as described above, the lower end portion of the washer member 16 that connects the disk saw blade 14 to the output shaft 44 is located within the insertion portion 12A of the base 12 and is located above the axis AL (refer to Figure 3 and Figure 9 ). Further, the radii of curvature of the inner guide groove 71C and the outer guide groove 71D of the front guide member 71 and the radii of curvature of the inner guide groove 81C and the outer guide groove 81D of the rear guide member 81 are set such that when the disk saw main body 20 is rotated from the upright position to the tilting position by the tilting mechanism 60, the lower end portion of the washer member 16 is displaced to the right within the insertion portion 12A of the base 12 (refer to Figure 4 and Figure 10 ). That is, when the disk saw main body 20 is rotated from the upright position to the tilting position by the tilting mechanism 60, the disk saw main body 20 relatively moves upward with respect to the base 12 so that the vertical position of the lower end portion of the washer member 16 does not change downward (the washer member 16 does not protrude downward from the base 12).

[0099] (Function and Effect)

[0100] Next, the functions and effects of the present embodiment will be described.

[0101] In the circular saw 10 configured as described above, at the upright position of the circular saw main body 20, the circular saw blade 14 is arranged with the left - right direction as the plate - thickness direction. Therefore, in the cutting process at the upright position of the circular saw main body 20, the cutting surface of the workpiece is formed along a plane orthogonal to the left - right direction.

[0102] When the cutting surface of the workpiece is an inclined surface, the circular saw main body 20 is tilted from the upright position toward the tilting position side by the tilting mechanism 60. For example, when the cutting surface of the workpiece is set as a 45 - degree inclined surface, the circular saw main body 20 is tilted toward the tilting position (45 - degree tilt position) by the tilting mechanism 60. Specifically, in the front - side tilting mechanism portion 70, the fixing rod 77 is rotated to release the fastening state of the fixing rod 77 to the front guide member 71, and in the rear - side tilting mechanism portion 80, the fixing knob 87 is rotated to release the fastening state of the fixing knob 87 to the rear guide member 81. Thereby, tilting (movement) of the circular saw main body 20 toward the tilting position side is allowed.

[0103] Then, the operator tilts the circular saw main body 20 at the upright position toward the tilting position side. Thereby, by the tilting mechanism 60, the circular saw main body 20 rotates and tilts to the right side. Specifically, the inner guide shaft 73 of the front tilting plate 72 moves upward from the lower end portion along the inner guide groove 71C of the front guide member 71, and the outer guide shaft 74 of the front tilting plate 72 moves upward from the lower end portion along the outer guide groove 71D of the front guide member 71. Also, the inner guide shaft 83 of the rear tilting plate 82 moves upward from the lower end portion along the inner guide groove 81C of the rear guide member 81, and the outer guide shaft 84 of the rear tilting plate 82 moves upward from the lower end portion along the outer guide groove 81D of the rear guide member 81. In the front - side tilting mechanism portion 70, the inner guide shaft 73 reaches the upper end portion of the inner guide groove 71C, and the outer guide shaft 74 reaches the upper end portion of the outer guide groove 71D. In the rear - side tilting mechanism portion 80, the inner guide shaft 83 reaches the upper end portion of the inner guide groove 81C, and the outer guide shaft 84 reaches the upper end portion of the outer guide groove 81D. Thereby, the circular saw main body 20 is arranged at the tilting position. Further, when the circular saw main body 20 tilts from the upright position to the tilting position, the fixed shaft 76 is arranged at the upper end portion of the fixing hole 71E of the front guide member 71, and the fixed shaft 86 is arranged at the upper end portion of the fixing hole 81E of the rear guide member 81. In this state, the fixing rod 77 is rotated to fasten the fixing rod 77 to the front guide member 71, and the fixing knob 87 is rotated to fasten the fixing knob 87 to the rear guide member 81, so that the circular saw main body 20 is fixed (connected without relative movement) to the base 12.

[0104] However, in the tilting mechanism located on the lower side (lower left) of the washer member 16 during tilting, when the circular saw main body 20 rotates from the upright position to the tilting position, the washer member 16 is displaced diagonally downward to the right. Therefore, in the prior art, it is necessary to sufficiently separate the circular saw main body 2 from the workpiece upward to avoid interference between the washer member 16 and the workpiece so that the washer member does not protrude downward from the base during tilting. In this case, the workability may be reduced.

[0105] Among them, in the tilting mechanism 60 of the circular saw 10, the front tilting mechanism portion 70 of the tilting mechanism 60 is configured to include a front tilting plate 72 connected to the circular saw main body 20 and a front guide member 71 that guides the rotation of the front tilting plate 72. And the rear tilting mechanism portion 80 of the tilting mechanism 60 is configured to include a rear tilting plate 82 connected to the circular saw main body 20 and a rear guide member 81 that guides the rotation of the rear tilting plate 82. The front tilting plate 72 and the rear tilting plate 82 are configured not to relatively move with respect to the circular saw main body 20 when the circular saw main body 20 tilts. When the circular saw main body 20 tilts (rotates) from the upright position to the tilting position, the entire circular saw main body 20 is separated from the base 12 along the side surface of the circular saw blade 14 by the front guide member 71 and the rear guide member 81. As a result, the cutting depth becomes shallower (the protruding amount of the circular saw blade 14 protruding downward from the lower surface 12C of the base decreases). Thereby, even if the circular saw main body 20 is tilted from the upright position, it is possible to suppress the downward displacement of the washer member 16 that connects the circular saw blade 14 and the output shaft 44. Specifically, at the upright position, the tilting position of the circular saw main body 20, and a predetermined position between the upright position and the tilting position, the lower end portion of the washer member 16 is located inside the insertion portion 12A of the base 12. As a result, it is possible to suppress the reduction of the cutting depth of the circular saw blade 14 and to suppress the washer member 16 from protruding downward from the base 12. Therefore, it is possible to suppress the reduction of the workability of the circular saw 10.

[0106] In addition, the front guide member 71 has an inner guide groove 71C and an outer guide groove 71D that guide the rotation of the front tilting plate 72, and the rear guide member 81 has an inner guide groove 81C and an outer guide groove 81D that guide the rotation of the rear tilting plate 82. And, when viewed from the front-rear direction, the inner guide groove 71C (inner guide groove 81C) and the outer guide groove 71D (outer guide groove 81D) are formed in an arc shape centered on the axis AL, and are inclined upward as they face the right side. In addition, the inner guide shaft 73 (inner guide shaft 83) is inserted into the lower end portion of the inner guide groove 71C (inner guide groove 81C), and the outer guide shaft 74 (outer guide shaft 84) is inserted into the lower end portion of the outer guide groove 71D (outer guide groove 81D). And, the radius of curvature of the inner guide groove 71C (inner guide groove 81C) and the outer guide groove 71D (outer guide groove 81D) is set to increase as it goes from the lower end portion to the upper end portion. Thereby, the circular saw main body 20 can be rotated from the erected position to the tilted position with a simple structure, and the circular saw main body 20 can be relatively moved upward with respect to the base 12. In other words, with the above structure, the amount of movement of the lower end position of the washer member 16 that moves along with the tilting can be controlled, and a part of the washer member 16 protruding downward from the base 12 can be suppressed. That is, the length (amount) of the circular saw blade 14 protruding from the lower surface 12C of the base, that is, the change in the cutting depth can be controlled. In particular, in the present embodiment, the amount of up-and-down movement of the lower end of the washer member 16 generated by the tilting of the circular saw main body 20 is below the up-and-down distance between the lower end of the washer member 16 and the lower surface 12C of the base when the circular saw main body 20 is in the non-tilted position. Specifically, the amount of up-and-down movement of the lower end of the washer member 16 is set to 0.5 mm, and the distance S1 is set to 1.0 mm. Thereby, contact between the washer member 16 and the workpiece can be appropriately suppressed. In the case of applying the present invention, for the purpose of ensuring the cutting depth in the erected position, it is only necessary to configure the lower end position of the washer member 16 in the tilted state to be at the same position as or above the lower end position of the washer member 16 in the erected state (non-tilted state). By making the lower end positions of the washer member 16 in the tilted state and the erected state the same, a decrease in the excessive cutting depth can be suppressed. In the present embodiment, since cutting using a guide rail is assumed, the position of the axis AL is set at a position a predetermined distance below the lower surface 12C of the base, but the present invention can also be applied to a circular saw that does not consider a guide rail. For example, the position of the axis AL may also be located at a position overlapping the lower surface 12C of the base. In this case, in the cutting method without using a guide rail (sliding the base 12 directly on the workpiece), even if it is tilted, the cutting position on the upper surface of the workpiece does not change. That is, the horizontal plane GB and the lower surface 12C of the base may also be set to be on the same plane.The invention of the present application functions appropriately particularly in a structure where the axis AL is located below the washer 16 (the holding member of the circular saw blade 14).

[0107] In addition, it is configured such that the radius of curvature of the guide groove increases as it goes from the lower end portion toward the upper end portion, but the present invention is not limited thereto. For example, during the above-described reverse tilting, the washer member moves upward and the cutting depth decreases. Therefore, in the case of reverse tilting, it can also be configured such that the tendency of change is reversed to ensure the cutting depth. Further, in order to optimize the configuration of the accessory functions (lighting device, blower mechanism), it is also possible to control the movement of the main body during tilting by adjusting the radius of curvature of the guide groove. In the case of the above-described embodiment, in order to ensure the cutting depth, the inclined guide portions (front guide member 71, rear guide member 81) may be enlarged, but by reversing the change in the radius of curvature, it is also possible to reduce the size of the inclined guide portions (front guide member 71, rear guide member 81). In this case, although the lower end position of the washer member 16 continuously moves downward as it tilts, in addition to the above-described effect of reducing the size, it is also possible to suppress the amount of movement of the washer member 16 in the left-right direction accompanying the tilting. That is, the effect of the present invention is not limited to ensuring the cutting depth. In the present embodiment, the guide groove is provided on the base 12 side and the guide shaft is provided on the circular saw main body 20 side, but this relationship may be reversed, and the guide groove may be provided on the circular saw main body 20 side and the guide shaft may be provided on the base 12 side. Further, the guide groove has a shape of a groove that is closed at one side in the front-rear direction, but it may be a through hole. In addition, as the member for holding the circular saw blade 14, the washer member 16 that is a washer has been described, but the present invention is not limited to a washer, and any member that holds the circular saw blade 14 may be used. That is, in the present invention, it is only necessary to be configured to adjust the amount of movement in the up-down direction of the holding member that holds the circular saw blade 14 during tilting. In addition, in the present specification, as the member that may be located below the lower surface 12C of the base during tilting, the washer 16 (holding member) has been described as an example, but other members that move during tilting may also be targeted. For example, the fixing bolt 52 and the saw cover 24 may have a part that is located below the washer 16 during tilting depending on their shapes, and a part of the motor housing 26 and the battery 32 that are located on the left side of the circular saw main body 20 during anti-tilting moves downward. Therefore, it can also be considered that they do not protrude downward from the lower surface 12C of the base or do not contact the base 12 during tilting.

[0108] In addition, as described above, the front guide member 71 has an inner guide groove 71C and an outer guide groove 71D, and the rear guide member 81 has an inner guide groove 81C and an outer guide groove 81D. That is, in the front tilting mechanism portion 70 and the rear tilting mechanism portion 80, the rotation of the circular saw main body 20 is guided by two guide grooves. Therefore, when the front tilting plate 72 and the rear tilting plate 82 rotate, both can be guided well.

[0109] In addition, in the front tilting mechanism portion 70, a cylindrical inner guide shaft 73 is movably inserted into the inner guide groove 71C, and the inner guide groove 71C guides the movement of the inner guide shaft 73. Moreover, in the rear tilting mechanism portion 80, a cylindrical inner guide shaft 83 (outer guide shaft 84) is movably inserted into the inner guide groove 81C (outer guide groove 81D), and the inner guide groove 81C (outer guide groove 81D) guides the movement of the inner guide shaft 83 (outer guide shaft 84). Thus, when the tilting mechanism 60 operates, these guide shafts are in line contact with the inner peripheral surface of the corresponding guide grooves and are guided by these guide grooves. Therefore, the sliding resistance during the operation of the tilting mechanism 60 can be reduced, and the tilting mechanism 60 can operate smoothly.

[0110] In addition, in the front tilting mechanism portion 70, a bearing member 75 configured as a ball bearing (rolling bearing) is provided at the front end portion of the outer guide shaft 74, and the bearing member 75 is movably inserted into the outer guide groove 71D. Thereby, the sliding resistance during the operation of the front tilting mechanism portion 70 can be further reduced, and the front tilting mechanism portion 70 can operate more smoothly. For the invention of providing a bearing member on the guide shaft, it can also be applied to a structure in which the curvature radius of the guide portion that forms an arc is constant.

[0111] In addition, in the front tilting mechanism portion 70, a fixed shaft 76 extends forward from the front tilting plate 72, is inserted into a fixing hole 71E of the front guide member 71, and the front end portion of the fixed shaft 76 protrudes forward from the front guide member 71. And a fixing rod 77 is threadedly engaged with the front end portion of the fixed shaft 76. Thereby, by fastening the fixing rod 77 to the front guide member 71, the circular saw main body 20 can be fixed (connected so as not to move relatively) to the base 12. Similarly, in the rear tilting mechanism portion 80, a fixed shaft 86 extends rearward from the rear tilting plate 82, is inserted into a fixing hole 81E of the rear guide member 81, and the rear end portion of the fixed shaft 86 protrudes rearward from the rear guide member 81. And a fixing knob 87 is threadedly engaged with the rear end portion of the fixed shaft 86. Thereby, by fastening the fixing knob 87 to the rear guide member 81, the circular saw main body 20 can be fixed (connected so as not to move relatively) to the base 12.

[0112] In addition, in the front tilting mechanism portion 70, the front tilting plate 72 is disposed on the rear side of the front guide member 71, and the inner guide groove 71C and the outer guide groove 71D of the front guide member 71 are formed in a groove shape that opens rearward. Further, in the rear tilting mechanism portion 80, the rear tilting plate 82 is disposed on the front side of the rear guide member 81, and the inner guide groove 81C and the outer guide groove 81D of the rear guide member 81 are formed in a groove shape that opens forward. Thereby, it is possible to suppress the machining chips generated during cutting from entering the inner guide groove 71C, the outer guide groove 71D, the inner guide groove 81C, and the outer guide groove 81D. Therefore, the tilting mechanism 60 can operate well.

[0113] In addition, the front tilting mechanism portion 70 includes a front link 78, and the front link 78 is rotatably connected to the front guide member 71 about the axis AL. A pair of link holes 78A in a long hole shape with the vertical direction as the length direction are formed in the front link 78, and the inner guide shaft 73 and the outer guide shaft 74 are inserted into the link holes 78A, and the inner guide shaft 73 and the outer guide shaft 74 are engaged with the link holes 78A in the left-right direction. Similarly, the rear tilting mechanism portion 80 includes a rear link 88, and the rear link 88 is rotatably connected to the rear guide member 81 about the axis AL. A pair of link holes 88A in a long hole shape with the vertical direction as the length direction are formed in the rear link 88, and the inner guide shaft 83 and the outer guide shaft 84 are inserted into the link holes 88A, and the inner guide shaft 83 and the outer guide shaft 84 are engaged with the link holes 88A in the left-right direction. That is, the guide shafts (73, 74, 83, 84) in the present embodiment are guided and tilted by both the guide portion (guide groove) provided on the base 12 and the restricting members (front link 78, rear link 88) that rotate relative to the base 12 when the circular saw main body 20 tilts. Thereby, the guide shaft suppresses the relative movement of the circular saw main body 20 with respect to the restricting members (front link 78, rear link 88) in the extending direction of the output shaft 44, and can move in the extending direction of the arc of the guide portion. In other words, with respect to the restricting members (front link 78, rear link 88) that rotate relative to the base 12 when the circular saw main body 20 tilts, the circular saw main body 20 is supported by the restricting members so as to be tiltable relative to the base 12 in a direction perpendicular to the extending direction of the output shaft 44. Thereby, it is possible to suppress the movement of the guide shafts (73, 74, 83, 84) in the extending direction of the output shaft 44 within the arc-shaped guide portion during tilting, and to suppress the excessive contact between the guide shafts and the guide portion. Therefore, when the tilting mechanism 60 operates, the front tilting plate 72 (and the rear tilting plate 82) can rotate well, and the circular saw main body 20 can tilt more smoothly.

[0114] That is, assuming that the front link 78 is omitted in the front tilting mechanism section 70, the movement of the inner guide shaft 73 and the outer guide shaft 74 in the inner guide groove 71C and the outer guide groove 71D (particularly the extending direction of the output shaft 44) is not restricted. The same applies to the rear tilting mechanism section 80. Therefore, when the tilting mechanism 60 operates, for example, when the circular saw main body 20 relatively moves in the extending direction of the output shaft 44 with respect to the base 12, or when a lateral position shift occurs between the front tilting plate 72 and the rear tilting plate 82, a part of the guide shafts (73, 74, 83, 84) moves in a direction intersecting the arc (guiding direction) within the guiding section, so that the inner surface of the guiding section comes into excessive contact with the guide shafts, and the circular saw main body 20 may not be able to tilt smoothly.

[0115] In contrast, the front tilting mechanism section 70 (the rear tilting mechanism section 80) is provided with a front link 78 (a rear link 88) that engages with the front tilting plate 72 (the rear tilting plate 82) in the lateral direction (the extending direction of the output shaft 44). Therefore, by means of the front link 78 (the rear link 88), the movement of the inner guide shaft 73 and the outer guide shaft 74 (the inner guide shaft 83 and the outer guide shaft 84) in the longitudinal direction (mainly the lateral direction) of the inner guide groove 71C and the outer guide groove 71D (the inner guide groove 81C and the outer guide groove 81D) can be restricted. Moreover, the front link 78 (the rear link 88) can be rotatably connected to the front guide member 71 (the rear guide member 81) about the axis AL. Therefore, according to the lateral displacement amount of the front guide member 71 (the rear guide member 81) that rotates about the axis AL, the inner guide shaft 73 and the outer guide shaft 74 (the inner guide shaft 83 and the outer guide shaft 84) move along the longitudinal direction of the inner guide groove 71C and the outer guide groove 71D (the inner guide groove 81C and the outer guide groove 81D). As a result, the relative movement of the circular saw main body 20 with respect to the output shaft 44 direction of the base 12 and the lateral position shift between the front tilting plate 72 and the rear tilting plate 82 during the operation of the tilting mechanism 60 can be suppressed. Therefore, when the tilting mechanism 60 operates, the front tilting plate 72 and the rear tilting plate 82 can rotate well, and the tilting operation of the circular saw main body 20 can be made smoother. Regarding the invention of restricting the movement of the guide shafts by the restricting members (the front link 78, the rear link 88), it can be applied even to a structure with a constant curvature radius of the guiding section that forms an arc, and it is particularly effective in a circular saw having a tilting mechanism based on a hypothetical tilting axis.

[0116] In addition, the front link 78 (rear link 88) is made of sintered metal composed of iron, and the front guide member 71 (rear guide member 81) is made of aluminum. That is, the mechanical strength of the front link 78 (rear link 88) is higher than that of the front guide member 71 (rear guide member 81). Therefore, the wear resistance of the front link 78 (rear link 88) can be improved, and the durability of the tilting mechanism 60 can be improved.

[0117] In addition, lubricating oil is impregnated in the front link 78 (rear link 88). Thereby, the wear resistance of the front link 78 (rear link 88) can be further improved, and the durability of the tilting mechanism 60 can be further improved. In particular, the sliding of the link hole 78A (link hole 88A) with the inner guide shaft 73 and the outer guide shaft 74 (inner guide shaft 83 and outer guide shaft 84) becomes smooth due to the lubricating oil. Therefore, deterioration caused by wear can be suppressed, and the operation can be prevented from deteriorating due to excessive frictional resistance. In addition, the front link 78 (rear link 88) is interposed between the circular saw main body 20 (front tilting plate 72) and the base 12 (front guide member 11), thereby having the effect of reducing the resistance (sliding resistance) when they move relative to each other. In the above, an invention capable of improving the cutting performance by changing the curvature radius of the guide groove is described, but the sliding resistance reducing mechanism formed by the front link 78 (rear link 88) can be applied independently of the invention of changing the curvature radius of the guide groove.

[0118] Reference Signs

[0119] 10 - Circular saw (working machine), 12 - Base, 12A - Insertion portion, 14 - Circular saw blade, 16 - Washer member, 20 - Circular saw main body (main body portion), 42 - Motor, 44 - Output shaft, 60 - Tilting mechanism, 71 - Front guide member (guide member), 71C - Inner guide groove (guide groove), 71D - Outer guide groove (guide groove), 71E - Fixing hole, 72 - Front tilting plate (movable member), 73 - Inner guide shaft (guide shaft), 74 - Outer guide shaft (guide shaft), 75 - Bearing member, 76 - Fixed shaft, 77 - Fixed rod (fixing member), 78 - Front link (restricting member), 81 - Rear guide member (guide member), 81C - Inner guide groove (guide groove), 81D - Outer guide groove (guide groove), 81E - Fixing hole, 82 - Rear tilting plate (movable member), 83 - Inner guide shaft (guide shaft), 84 - Outer guide shaft (guide shaft), 86 - Fixed shaft, 87 - Fixed knob (fixing member), 88 - Rear link (restricting member), 88A - Link hole (restricting hole), AL - Axis.

Claims

1. An operating machine, characterized in that, it includes: a main body having: a motor; and an output shaft that rotates in the left - right direction by the drive of the motor; a circular saw blade that can be integrally rotatably connected to the output shaft and extends in the front - rear direction; a washer member for holding the circular saw blade on the output shaft; a base disposed below the main body and having an insertion portion through which the circular saw blade is inserted; and a tilting mechanism configured to be able to change the main body from a non - tilting state in which the output shaft extends in the left - right direction to a tilting state in which it tilts a predetermined angle to one side in the left - right direction with respect to the base, the tilting mechanism having: a guiding member provided on one of the main body and the base and having a guiding portion; and a guided portion provided on the other of the main body and the base, which moves inside the guiding portion and is guided by the guiding portion, configured such that in either the non - tilting state or the tilting state, an imaginary axis extending in the front - rear direction at a position below the washer member overlaps with the circular saw blade, configured such that in an imaginary state where the main body in the non - tilting state is rotated by the predetermined angle about the imaginary axis, at least a part of the washer member is located below the lower surface of the base, and when changing from the non - tilting state to the tilting state, the tilting mechanism causes the washer member to move at a position above the lower surface of the base.

2. The operating machine according to claim 1, characterized in that, in at least one of the non - tilting state and the tilting state, at least a part of the washer member is located inside the insertion portion.

3. The operating machine according to claim 1 or 2, characterized in that, the guiding portion is formed in an arc shape, and the radius of curvature of the guiding portion is set to increase at least in part.

4. The operating machine according to claim 3, characterized in that, a pair of the guiding portions are formed on the guiding member, and one of the guiding portions is located radially outside the other guiding portion.

5. The operating machine according to claim 4, characterized in that, the guided portion includes a pair of guide shafts in the front - rear direction, and the guide shafts are movably inserted into the pair of guiding portions respectively.

6. The operating machine according to claim 5, characterized in that, the guide shafts are formed in a cylindrical shape.

7. The operating machine according to claim 1, characterized in that, a bearing member is provided on the guided portion and can be movably inserted into the guiding portion.

8. The operating machine according to claim 7, characterized in that, a pair of the guiding portions and the guided portions are provided respectively, a pair of the guided portions are arranged to be separated in a direction orthogonal to the front - rear direction, the bearing member is provided on at least one side of the pair of guided portions that is located outside in the direction orthogonal to the front - rear direction.

9. The operating machine according to claim 1, characterized in that, A pair of the guiding part and the guided part are respectively provided. The guiding part is formed in an arc shape. A fixing hole different from the guiding part and in an arc shape is formed in the guiding member. The tilting mechanism has: a fixing shaft inserted through the fixing hole; and a fixing member provided at the front end of the fixing shaft and operated by an operator. By operating the fixing member, the operator can allow or restrict the tilting of the main body part relative to the base. The fixing hole is configured to be located between a pair of the guiding parts in a direction orthogonal to the front-rear direction.

10. The working machine according to claim 1, characterized in that the tilting mechanism has a restricting member configured to be rotatable about the front-rear direction as a center, and the restricting member is configured to guide the movement of the main body part in a manner allowing relative movement in a predetermined direction with respect to the restricting member.

11. The working machine according to claim 10, characterized in that a restricting hole extending in a direction crossing the extending direction of the output shaft is formed in the restricting member, and by inserting a part of the main body part through the restricting hole and engaging the restricting member and the main body part in the extending direction of the output shaft, relative movement of the main body part relative to the restricting member in a direction crossing the predetermined direction is restricted.

12. The working machine according to claim 10, characterized in that the restricting member is made of a material having a higher mechanical strength than the guiding member, or is configured to be impregnated with lubricating oil, or is formed by sintering.

13. A working machine, characterized in that it includes: a main body part having: a motor; and an output shaft that rotates by driving of the motor; a disc saw blade that can be integrally rotatably connected to the output shaft; a washer member for holding the disc saw blade on the output shaft; a base disposed below the main body part and having a through portion through which the disc saw blade passes; and a tilting mechanism that can tilt the main body part relative to the base from a non-tilting state to a tilting state tilted by 45 degrees, wherein a lower end position of the washer member in the tilting state is located at the same position as or above a lower end position of the washer member in the non-tilting state.

14. A working machine, characterized in that it includes: a main body part having: a motor; and an output shaft that rotates by driving of the motor; a disc saw blade that can be integrally rotatably connected to the output shaft; a base disposed below the main body part and having a through portion through which the disc saw blade passes; and a tilting mechanism that can tilt the main body part relative to the base from a non-tilting state to a tilting state tilted by 45 degrees, wherein the disc saw blade is connected to the output shaft via a washer member. configured such that the intersection of the horizontal plane, which is located below the washer member and parallel to the lower surface of the base, and the circular saw blade is located at substantially the same position when the main body portion is in the non-tilting state and when the main body portion is in the tilting state, and the difference between the lower end position of the washer member in the non-tilting state and the lower end position of the washer member in the tilting state in the vertical direction is equal to or less than the vertical distance between the lower end position of the washer member in the non-tilting state and the lower surface of the base.

15. An operating machine, characterized in that, it includes: a main body portion having: a motor; and an output shaft that rotates by driving of the motor; a circular saw blade that can be integrally rotatably connected to the output shaft; a base that is disposed below the main body portion and has an insertion portion through which the circular saw blade is inserted; and a tilting mechanism that can tilt the main body portion relative to the base from a non-tilting state to a tilting state, the circular saw blade is connected to the output shaft via a washer member, configured such that the intersection of the horizontal plane, which is located below the washer member and parallel to the lower surface of the base, and the circular saw blade is located at substantially the same position when the main body portion is in the non-tilting state and when the main body portion is in the tilting state, and when the main body portion is tilted from the non-tilting state to the tilting state, the lower end of the washer member continuously moves upward or downward.

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