JP2023097985A - work machine - Google Patents

Abstract

To improve workability.SOLUTION: A guide mechanism 60 of a circular saw 10 includes: a guide member 62 which is connected to a base 20 so as to be movable in a right and left direction; and an adjustment mechanism 70 which adjusts a position of the guide member 62 in the right and left direction. The adjustment mechanism 70 has a roller 75 abutting on a rear surface of the guide member 62. By rotating the roller 75, the guide member 62 is moved in the right and left direction by frictional force between the roller 75 and the guide member 62. Concretely, an outer peripheral surface of the roller 75 is brought into pressure contact with the rear surface of the guide member 62 by a lever energization spring 76 and the guide member 62 is moved in the right and left direction by interlocking with the rotation of the roller 75. Thus, the position of the guide member 62 in the right and left direction can be easily adjusted. Therefore, workability in position adjustment work of the guide member 62 can be improved.SELECTED DRAWING: Figure 8

Description

The present invention relates to working machines.

In the cutting machine (working machine) described in Patent Document 1 below, a guide bar is slidably provided on a base, and a guide plate is provided at one end of the guide bar. Thus, by fixing the guide bar to the base and sliding the guide plate along the end surface of the workpiece, it is possible to guide the movement of the cutting machine during the cutting process.

JP 2014-4759 A

Here, in the cutting machine, the relative position of the cutting machine with respect to the workpiece is determined by moving the guide bar in the lateral direction with respect to the base. Specifically, an operator grips the guide bar, moves the guide bar while adjusting its position, and fixes the guide bar to the base. For this reason, for example, the work for finely adjusting the position of the guide bar becomes relatively difficult, and there is a possibility that the workability will deteriorate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a work machine capable of improving workability in consideration of the above facts.

According to one or more embodiments of the present invention, a base is formed in a plate shape, is placed on a workpiece during machining and slides on the workpiece in one direction in a first direction, and is connected to the base. , a main body configured to include a motor and a tip tool operated by the motor; a guide member that is movably connected to the base, has a guide part at one end in the longitudinal direction that abuts on the end surface of the workpiece during machining, and guides the movement of the base in the first direction during machining; an adjustment mechanism including an adjustment member that abuts on the guide member, the adjustment mechanism moving the guide member in the second direction by a frictional force between the adjustment member and the guide member by operating the adjustment member; , is a working machine.

In one or more embodiments of the present invention, the adjustment mechanism has a biasing member that biases the adjustment member toward the guide member, and the adjustment member is biased toward the guide by the biasing member. It is a work machine that is biased to a member.

One or more embodiments of the present invention is a working machine in which a portion of the adjustment member that contacts the guide member is made of a material having a larger coefficient of friction than metal.

One or more embodiments of the present invention is a working machine configured such that the adjustment member is switchable between an adjustment position in contact with the guide member and a retracted position away from the guide member.

In one or more embodiments of the present invention, the adjustment mechanism is provided with a switching member to which the adjustment member is connected, the switching member is movably connected to the base, and the switching member moves. Thus, it is a work machine in which the adjustment member can be switched to the adjustment position or the retracted position.

One or more embodiments of the present invention is a work machine having a holding mechanism that holds the adjustment member at the retracted position.

In one or more embodiments of the present invention, the base is provided with a rotation shaft whose axial direction is the plate thickness direction of the base, and the switching member is rotatable about the rotation shaft. and the adjusting member is arranged between the rotating shaft and the working machine main body in the second direction.

In one or more embodiments of the present invention, the switching member is rotatably provided with an adjustment shaft whose axial direction is the plate thickness direction of the base, and the adjustment member moves relative to the adjustment shaft. It is a work machine that is incapably connected.

In one or more embodiments of the present invention, the adjustment shaft is connected to the switching member so as to be relatively movable in an axial direction, and in the retracted position, one end of the adjustment shaft is formed on the base. It is a work machine that is fitted into the fitted fitting hole.

One or more embodiments of the present invention is a work machine in which the adjustment mechanism has a shaft biasing member that biases the adjustment shaft toward one end.

One or more embodiments of the present invention is a work machine in which a knob is formed on the other end of the adjustment shaft.

One or more embodiments of the present invention is a work machine in which the adjustment member is configured as a roller that is connected to the adjustment shaft so as not to move relative to the adjustment shaft.

According to one or more embodiments of the present invention, workability can be improved.

FIG. 2 is a top plan view showing the circular saw according to the present embodiment; Fig. 2 is a side view of the circular saw shown in Fig. 1 as seen from the left; FIG. 3 is a side view showing a state in which the circular saw body shown in FIG. 2 is shifted from an initial position to a predetermined tilted position, with the motor housing portion and the battery holder portion removed; FIG. 3 is a side view showing a state in which the circular saw main body shown in FIG. 2 is moved from the initial position to the maximum tilt position, with the motor housing portion and the battery holder portion removed; FIG. 3 is a plan cross-sectional view (cross-sectional view taken along the line 5-5 in FIG. 2) showing the inside of the circular saw body shown in FIG. 2 as viewed from above; FIG. 2 is a cross-sectional view (cross-sectional view taken along the line 6-6 in FIG. 1) seen from the front side showing a mounting state of the guide member shown in FIG. 1 to the base; FIG. 2 is an enlarged perspective view of the periphery of the guide mechanism shown in FIG. 1 as seen obliquely from the rear right; (A) is a plan view of the guide mechanism shown in FIG. 7 as seen from above, and (B) is a plan view showing a state in which the switching lever of (A) is rotated from the adjustment position to the retracted position. be. (A) is a cross-sectional view of the adjustment mechanism shown in FIG. 8(A) as viewed obliquely from the right rear side (cross-sectional view taken along line 9A-9A in FIG. 8(A)); 9B) is a cross-sectional view (a cross-sectional view taken along the line 9B-9B of FIG. 8(B)) seen from the rear side of the adjustment mechanism shown in FIG. FIG. 3 is a cross-sectional view (cross-sectional view taken along the line 10-10 in FIG. 2) showing a fixed state between the link and the saw cover portion of the protrusion amount adjusting mechanism shown in FIG. 2; FIG. 3 is an exploded perspective view of the protrusion amount adjustment mechanism shown in FIG. 2; (A) is a perspective view of a modification of the protrusion amount adjustment mechanism shown in FIG. 2 as viewed obliquely from the rear left, and (B) is a left side view of the modification of the protrusion amount adjustment mechanism of (A); is a side view. FIG. 13 is a cross-sectional view (cross-sectional view taken along line 13-13 in FIG. 12B) showing the periphery of the lower end portion of the link in the modification of the protrusion amount adjusting mechanism shown in FIG. 12B; FIG. 4 is a side view showing an example in which the first lever and the second lever of the protrusion amount adjustment mechanism shown in FIG. 3 are integrated;

A circular saw 10 as a working machine according to the present embodiment will be described below with reference to the drawings. An arrow UP, an arrow FR, and an arrow LH appropriately shown in the drawings indicate the upper side, the front side, and the left side of the circular saw 10, respectively. In the following description, when the up/down, front/rear, and left/right directions are used, the up/down, front/rear, and left/right directions of the circular saw 10 are indicated unless otherwise specified.

The circular saw 10 is configured as an electric tool for cutting the workpiece W. As shown in FIG. Specifically, the operator who places the circular saw 10 on the workpiece W and is positioned on the rear side of the circular saw 10 holds the handle portion 40 described later and moves the circular saw 10 to the front side (second One side of one direction) to cut the material W to be processed.

As shown in FIGS. 1 to 5, the circular saw 10 includes a base 20, a circular saw body 30 as a main body, a guide mechanism 60 for guiding the movement of the circular saw 10 during cutting, and the circular saw body 30. is connected to the base 20 and a projection amount adjusting mechanism 80 for adjusting the amount of projection of the circular saw blade 12 of the circular saw body 30 from the base 20 . Each configuration of the circular saw 10 will be described below.

(About base 20)
The base 20 is made of metal and is formed in a substantially rectangular plate shape with the vertical direction as the plate thickness direction and the front-rear direction as the longitudinal direction. The lower surface of the base 20 is configured as a sliding surface 20A, and when the circular saw 10 cuts, the sliding surface 20A is placed on the workpiece W and slides on the workpiece W. (See Fig. 6).

An insertion portion 20B (see FIGS. 1 and 6) for arranging a circular saw blade 12 as a tip tool is formed through the right portion of the base 20. As shown in FIG. The insertion portion 20B is formed in a substantially rectangular shape whose longitudinal direction is the front-rear direction. Here, the circular saw blade 12 is formed in a substantially disk-like shape with the lateral direction as the plate thickness direction, and the central portion of the circular saw blade 12 can rotate integrally with the output shaft 54 of the drive mechanism 50, which will be described later. Fixed. The circular saw blade 12 is arranged in the insertion portion 20B, the upper portion of the circular saw blade 12 protrudes upward from the base 20, and the lower end portion of the circular saw blade 12 protrudes downward from the base 20. That is, the insertion portion 20B is configured as a hole through which a portion of the circular saw blade 12 protrudes from the lower surface of the base 20 toward the workpiece W (opposite side of the circular saw body 30).

Base ribs 20C that protrude upward are formed at both ends of the base 20 in the left-right direction, and the base ribs 20C extend in the front-rear direction. As shown in FIG. 6, the front end portion of the base 20 is provided with a left guide support portion 20D that supports a guide member 62, which will be described later, on the right side of the left base rib 20C. A left guide hole 20E extends through the left guide support portion 20D and the left base rib 20C in the left-right direction. A portion of the left base rib 20C is cut so that the left end of the left guide hole 20E opens upward. A right guide hole 20F is formed through the right base rib 20C in the left-right direction. The right guide hole 20F is formed in the same shape as the left guide hole 20E and is arranged coaxially with the left guide hole 20E.

(Regarding the circular saw body 30)
As shown in FIGS. 1, 2, and 5, the circular saw body 30 includes a housing 32 and a drive mechanism 50. As shown in FIGS.

(Regarding housing 32)
The housing 32 is composed of a plurality of housing members, constitutes the outer shell of the circular saw body 30 , and is arranged above the base 20 . The housing 32 is connected to the base 20 by a protrusion amount adjusting mechanism 80, which will be described later. The connection of housing 32 to base 20 will be described later. The housing 32 includes a saw cover portion 34 that covers the circular saw blade 12, a motor housing portion 36 that accommodates a drive mechanism 50 described later, and a battery holder portion 38 to which the battery 14 is mounted.

The saw cover portion 34 constitutes the right end portion of the housing 32 . The saw cover portion 34 is formed in a generally semi-disc shape with a thickness direction extending in the left-right direction and protruding upward, and is also formed in a concave shape that is open downward. An upper portion of the circular saw blade 12 is housed in a saw cover portion 34 and covered with the saw cover portion 34 . At the lower end of the left wall of the saw cover portion 34, a substantially cylindrical cover tube portion 34A projecting leftward is formed at the middle portion in the front-rear direction. A connecting tube portion 34B (see FIG. 1) is formed integrally with the front end portion of the saw cover portion 34, and the connecting tube portion 34B is formed in a substantially cylindrical shape whose axial direction is the left-right direction.

A locking hole 34C (see FIG. 10) for locking a fixing bolt 90 of a protrusion amount adjusting mechanism 80, which will be described later, is formed through the rear end portion of the left wall of the saw cover portion 34. is shaped like a square. A fixing boss 34D (see FIG. 10) for fixing an operation lever biasing spring 104 of a projection amount adjusting mechanism 80, which will be described later, is integrally formed on the left wall of the saw cover portion 34 on the front side of the locking hole 34C. The fixed boss 34</b>D is formed in a substantially cylindrical shape whose axial direction is the left-right direction, and protrudes leftward from the saw cover portion 34 . A regulating portion 34E is formed on the left wall of the saw cover portion 34. As shown in FIG. The restricting portion 34E is a portion that abuts on a first operating lever 96, which will be described later, to restrict the rotation of the first operating lever 96. As shown in FIG. The rotational position of the first operating lever 96 that contacts the restricting portion 34E is defined as the restricting position.

The motor housing portion 36 as a whole is formed in a substantially bottomed cylindrical shape that is open to the right. The motor housing portion 36 is arranged on the left side of the cover tube portion 34A of the saw cover portion 34 and fastened and fixed to the cover tube portion 34A.

The battery holder portion 38 extends rearward from the upper portion of the motor housing portion 36 and is spaced leftward from the saw cover portion 34 . The battery 14 is attached to the lower portion of the battery holder portion 38 from the rear side, and the battery 14 is arranged below the battery holder portion 38 and on the rear side of the motor housing portion 36 . The battery 14 is electrically connected to a control unit (not shown) and a motor 51 of a driving mechanism 50, which will be described later.

A handle portion 40 is provided above the motor housing portion 36 and the battery holder portion 38 . When viewed from the left side, the handle portion 40 is formed in a substantially U-shape that opens obliquely downward and forward, and both ends of the handle portion 40 are connected to the motor housing portion 36 and the battery holder portion 38 . The handle portion 40 is provided with a trigger 42 that can be pulled. The trigger 42 is electrically connected to the control section, and the later-described drive mechanism 50 operates according to the operation of the trigger 42 .

(Regarding drive mechanism 50)
As shown in FIG. 5 , the drive mechanism 50 includes a motor 51 and an output shaft 54 . The motor 51 is configured as a brushless motor, accommodated in the motor housing portion 36, and electrically connected to the control portion. The motor 51 has a motor shaft 51A whose axial direction is the horizontal direction, and the left end of the motor shaft 51A is rotatably supported by a first motor bearing 52 fixed to the motor housing portion 36. A right portion of the motor shaft 51A is rotatably supported by a second motor bearing 53 fixed to the saw cover portion 34 . A right end portion of the motor shaft 51A projects rightward from the second motor bearing 53, and a pinion gear is formed on the right end portion of the motor shaft 51A.

The output shaft 54 has a left-right direction as its axial direction, is arranged below the right end portion of the motor shaft 51A, and is rotatably supported by the housing 32 . An output gear (not shown) is provided on the output shaft 54 so as to be integrally rotatable. A two-stage transmission gear (not shown) is provided between the output gear and the output shaft 54, and the transmission gear meshes with the pinion gear and the output gear of the motor shaft 51A. A central portion of the circular saw blade 12 is fixed to the right end portion of the output shaft 54 . Thus, when the motor 51 is driven, the output shaft 54 and the circular saw blade 12 are configured to rotate around the output shaft 54 .

The lower portion of the circular saw blade 12 is covered with a protective cover 55 (see FIG. 2). The protective cover 55 is formed in a substantially semicircular shape that protrudes downward when viewed from the left side, and is formed in a concave shape that opens upward. Also, the protective cover 55 is connected to the output shaft 54 so as to be rotatable about the axis of the output shaft 54 . Further, the protective cover 55 is urged around the output shaft 54 by an urging spring (not shown) and held at the position shown in FIG. During cutting by the circular saw 10, the protective cover 55 is rotated around the output shaft 54 against the biasing force of the biasing spring by the workpiece W, exposing the blade portion of the circular saw blade 12. It is configured to

(Regarding the guide mechanism 60)
As shown in FIGS. 1 to 3 and 6 to 9, the guide mechanism 60 includes a guide member 62 and an adjustment mechanism .

(Regarding the guide member 62)
The guide member 62 includes a guide bar 62A and a guide plate 62B as a guide portion. The guide bar 62A is formed in a substantially rectangular bar shape extending in the left-right direction (second direction). The outer shape of the guide bar 62A when viewed from the left and right direction is set slightly smaller than the shape of the left guide hole 20E and the right guide hole 20F in the base 20. It is inserted into hole 20E. That is, the guide bar 62A is connected to the base 20 so as to be movable in the left-right direction. A bent portion 62A1 is formed on the right end side of the guide bar 62A, and the bent portion 62A1 is bent downward and leftward.

The guide plate 62B is formed in a substantially elongated plate shape extending in the front-rear direction with the left-right direction as the plate thickness direction. The guide plate 62B is arranged adjacent to the left side of the right end of the guide bar 62A, and the right end of the guide bar 62A is fixed to the front-rear middle portion of the right side surface of the guide plate 62B. By bringing the guide plate 62B into contact with the end face of the workpiece W, the circular saw 10 can be moved forward and backward along the end face of the workpiece W. As shown in FIG.

A fixed plate 64 made of a leaf spring or the like is provided on the left guide support portion 20D of the base 20. As shown in FIG. The fixed plate 64 is formed in a substantially U-shape that opens to the right when viewed from the front side, and is arranged on the left guide support portion 20D so as to sandwich the left guide support portion 20D from both sides in the vertical direction. Further, a guide fixing screw 66 is screwed into the left guide support portion 20</b>D, and the lower end of the guide fixing screw 66 is arranged above the lower wall of the fixing plate 64 . As a result, when the guide fixing screw 66 is rotated, the lower wall of the fixing plate 64 is pressed downward by the guide fixing screw 66, and the fixing plate 64 is elastically deformed downward, and the guide member 62 is pushed downward. press to. Thereby, the guide member 62 is fixed to the base 20 .

(Regarding the adjustment mechanism 70)
The adjustment mechanism 70 is provided on the base 20 and arranged behind the left end portion of the guide member 62 . The adjustment mechanism 70 includes a switching lever 71 as a switching member, a roller unit 73, a lever biasing spring 76 as a biasing member, and a shaft biasing spring 77 as a shaft biasing member. there is

(Regarding the switching lever 71)
As shown in FIGS. 7 to 9, the switching lever 71 is formed in a substantially elongated block shape. A lever tubular portion 71A is formed in a longitudinally intermediate portion of the switching lever 71, and the lever tubular portion 71A is formed in a substantially cylindrical shape whose axial direction is the vertical direction. The lever cylinder portion 71A is fitted over a rotation shaft 20G (see 8A and 8B) formed on the base 20, and is rotatably supported by the rotation shaft 20G. As a result, the switching lever 71 is rotatably connected to the base 20 with the vertical direction as the axial direction. Specifically, the rotation of the switching lever 71 moves the switching lever 71 to the adjusted position (the position shown in FIG. 8A) or to the retracted position (the position shown in FIG. 8A) rotated clockwise from the adjusted position in plan view. 8 (B)). The rotating shaft 20G is formed in a substantially cylindrical shape whose axial direction is the vertical direction, and a female screw is formed inside the rotating shaft 20G. A set screw 72 is screwed from above into the female thread of the rotary shaft 20G, and the set screw 72 prevents the switching lever 71 from coming off the rotary shaft 20G.

Further, a spring housing portion 71B (see FIGS. 9A and 9B) opened downward is formed on the lower surface of the lever cylinder portion 71A. The spring accommodating portion 71B is formed in a circular shape with a greater diameter than the inner peripheral surface of the lever cylinder portion 71A when viewed from below, and is arranged coaxially with the lever cylinder portion 71A.

An arm portion 71C is provided at one end portion of the switching lever 71, and the arm portion 71C extends from the upper portion of the lever cylinder portion 71A to the one end side of the switching lever 71. As shown in FIG. A distal end portion of the arm portion 71C is formed in a substantially cylindrical shape having a connecting hole 71D therein. An arm recess 71E (see FIGS. 9A and 9B) that opens downward is formed on the lower surface of the tip of the arm 71C. The arm concave portion 71E is formed in a circular shape with a larger diameter than the connecting hole 71D when viewed from below, and is arranged coaxially with the connecting hole 71D.

A switching operation portion 71F is provided at the other end of the switching lever 71, and the switching operation portion 71F extends from the lower portion of the lever cylinder portion 71A toward the other end of the switching lever 71. As shown in FIG. An operation knob portion 71G is formed integrally with the switching operation portion 71F, and the operation knob portion 71G is formed in a substantially rectangular plate shape and extends upward from the switching operation portion 71F.

(Regarding roller unit 73)
The roller unit 73 includes a roller shaft 74 as an adjusting shaft and a roller 75 as an adjusting member. The roller shaft 74 is formed in a substantially stepped columnar shape (see FIGS. 9A and 9B). Specifically, the roller shaft 74 includes a knob 74A that forms the upper end of the roller shaft 74, a roller rotation shaft 74B that forms an intermediate portion in the vertical direction of the roller shaft 74, and a lower end of the roller shaft 74. and a connecting shaft portion 74C. The roller rotating shaft portion 74B has a larger diameter than the connecting shaft portion 74C, and the knob 74A has a larger diameter than the roller rotating shaft portion 74B.

The roller rotating shaft portion 74B is inserted into the connecting hole 71D of the switching lever 71 so as to be relatively movable in the vertical direction, and is rotatably supported by the connecting hole 71D. That is, the roller shaft 74 is connected to the arm portion 71C of the switching lever 71 so as to be rotatable with the vertical direction as its axial direction and to be movable in the vertical direction. The knob 74A is configured as a grip portion that is gripped by an operator, and is arranged above the arm portion 71C. A lower end surface of the connecting shaft portion 74C is formed in a hemispherical shape that is convex downward. The lower end surface of the roller shaft 74 slides on the upper surface of the base 20 when the switching lever 71 is moved between the adjustment position and the retracted position. At the retracted position of the switching lever 71, the lower end (one end) of the connecting shaft portion 74C is fitted into the fitting hole 20H formed in the base 20 (see FIG. 9B). . As a result, the switching lever 71 is held at the retracted position.

The roller 75 is formed in a substantially cylindrical shape whose axial direction is the vertical direction. The roller 75 includes a core portion 75A forming a radially inner portion of the roller 75 and a pressing portion 75B forming a radially outer portion of the roller 75 (see FIGS. 9A and 9B). )reference). The core portion 75A is made of a metal material. The connecting shaft portion 74C of the roller shaft 74 is inserted into the core portion 75A from above by press fitting or the like, and the roller 75 is connected to the roller shaft 74 so as not to rotate relative to each other. Further, when the roller 75 is connected to the roller shaft 74 , the lower end of the roller shaft 74 protrudes below the roller 75 .

The pressing portion 75B is made of an elastic rubber material. That is, the pressing portion 75B is made of a material having a higher coefficient of friction than a metal material. At the adjustment position of the switching lever 71, the pressing portion 75B is in contact with the rear surface of the guide bar 62A of the guide member 62. As shown in FIG.

(Regarding the lever biasing spring 76)
As shown in FIGS. 9A and 9B, the lever biasing spring 76 is constructed as a torsion spring. The lever biasing spring 76 is attached to the rotating shaft 20</b>G of the base 20 and housed in the spring housing portion 71</b>B of the switching lever 71 . One end of the lever biasing spring 76 is locked to the base 20, and the other end of the lever biasing spring 76 is locked to the switching lever 71, so that the lever biasing spring 76 can be seen in plan view as a switching lever. The lever 71 is biased counterclockwise. As a result, when the switching lever 71 is at the adjusted position, the pressing portion 75B of the roller 75 is pressed against the rear surface of the guide bar 62A by the biasing force of the lever biasing spring 76, and the switching lever 71 is held at the adjusted position. It is configured. Further, in this state, the operator rotates the roller shaft 74 so that the non-fixed guide member 62 moves left and right. That is, the frictional force generated between the roller 75 and the guide member 62 transmits the rotational force of the roller 75 to move the guide member 62 . More specifically, the urging force of the lever urging spring 76 and the pressing force of the roller 75 are applied so that the guide member 62 moves in the horizontal direction in conjunction with the rotation of the roller 75 when a predetermined rotational force is applied to the roller 75 . The hardness and the like of the portion 75B are set.

(Regarding the shaft biasing spring 77)
The shaft biasing spring 77 is configured as a compression coil spring. The shaft-biasing spring 77 is attached to the lower end of the roller rotating shaft portion 74B of the roller shaft 74 and housed in the arm recess 71E of the switching lever 71 . The upper end of the shaft biasing spring 77 is locked to the upper surface of the arm recess 71E, the lower end of the shaft biasing spring 77 is locked to the upper surface of the roller 75, and the shaft biasing spring 77 is engaged with the roller unit 73 ( The roller shaft 74) is biased downward. As a result, in the retracted position of the switching lever 71, the lower end of the roller unit 73 (roller shaft 74) is fitted into the fitting hole 20H of the base 20 by the biasing force of the shaft biasing spring 77, so that the roller unit 73 is It is configured to be held by the base 20 . Thus, the roller shaft 74, the fitting hole 20H of the base 20, and the shaft biasing spring 77 constitute a holding mechanism for holding the roller 75 at the retracted position. By lifting the roller shaft 74 upward against the biasing force of the bias spring 77, the engagement state between the roller unit 73 and the base 20 is released, and the rotation of the switching lever 71 to the adjustment position side is permitted. It has become so.

(Regarding the protrusion amount adjustment mechanism 80)
As shown in FIGS. 1 to 3, 10, and 11, the protrusion amount adjusting mechanism 80 is configured as a mechanism for connecting the circular saw body 30 to the base 20, and also serves as a mechanism for connecting the circular saw blade 12 to the base. 20 (sliding surface 20A) is also configured as a mechanism for adjusting the amount of downward protrusion. The protrusion amount adjusting mechanism 80 includes a front connecting member 81, a link 83, a fixing bolt 90 as a fixing shaft, a fixture 92, a first operating lever 96 (first lever) as a lever, and a first operating lever 96 as a lever. It is configured including two operating levers 98 (second levers) and operating lever biasing springs 104 .

The front connecting member 81 is formed in a substantially block shape extending in the left-right direction, is arranged on the front side of the saw cover portion 34 , and is fixed to the base 20 . Shaft support portions 81A are provided at both ends of the front connecting member 81 in the left-right direction, respectively. They are arranged adjacently on the outer side in the left-right direction. A body support shaft 82 whose axial direction is the left-right direction is bridged over the pair of shaft support portions 81A. A main body support shaft 82 is inserted through the connecting tube portion 34B to rotatably support the connecting tube portion 34B. As a result, the front end portion of the saw cover portion 34 (circular saw body 30) is rotatably connected to the base 20 with the lateral direction as the axial direction. Specifically, when the amount of protrusion of the circular saw blade 12 from the base 20 is maximized, the circular saw body 30 is arranged at the initial position (the position shown in FIG. 2). Further, the amount of protrusion of the circular saw blade 12 from the base 20 is reduced by displacing the circular saw body 30 upward from the initial position. The position of the circular saw body 30 displaced upward by a predetermined distance (angle) from the initial position is defined as a predetermined tilt position (see FIG. 3). Note that FIG. 3 shows a state in which the rotation of the first operating lever 96 is restricted by coming into contact with the restricting portion 34E. The maximum tilt position (see FIG. 4) is the position of the circular saw body 30 at which it is displaced upward the most from the initial position. In this embodiment, the circular saw blade 12 does not protrude from the base 20 (the amount of protrusion is zero) at the maximum tilt position. Note that FIG. 4 shows a circle C centered on the rear end of the lower surface of the base 20. As shown in FIG. A circle C is a circle passing through the axis 90E when viewed in the axial direction of the axis 90E. In FIG. 4, similarly to FIG. 3, the rotation of the first operating lever 96 is restricted by coming into contact with the restricting portion 34E.

The link 83 is arranged adjacent to the rear left side of the saw cover portion 34 . Specifically, the link 83 is arranged between the saw cover portion 34 , the battery holder portion 38 and the battery 14 . The link 83 is formed in a substantially long block shape whose thickness direction is the left-right direction, extends in the vertical direction, and is curved in an arc shape projecting substantially rearward and obliquely upward when viewed from the side. Specifically, the center of the arcuate link 83 is arranged at a position offset from the axis of the main body support shaft 82 . A lower end portion of the link 83 is rotatably supported by the base 20 with the lateral direction as an axial direction. Specifically, a support plate 84 fixed to the base 20 is provided on the rear side of the link 83, and the support plate 84 is provided with a link support shaft 85 whose axial direction is the horizontal direction. A lower end portion of the link 83 is rotatably supported by a link support shaft 85 . A link hole 83A is formed through the link 83 in the left-right direction.

(Regarding the fixing bolt 90)
As shown in FIGS. 10 and 11, the fixing bolt 90 is arranged with the horizontal direction as its axial direction. The fixing bolt 90 includes a head portion 90A forming a base end portion of the fixing bolt 90, and a bolt body 90B extending leftward from the head portion 90A. The head portion 90A is formed in a substantially disc shape with the thickness direction extending in the left-right direction. The bolt main body 90B is formed in a substantially columnar shape with a diameter smaller than that of the head 90A. A locking portion 90C is formed at the base end portion of the bolt body 90B, and the locking portion 90C has a square shape similar to the locking hole 34C of the saw cover portion 34 when viewed from the axial direction of the fixing bolt 90. formed in the shape of The fixing bolt 90 is inserted from the right side into the locking hole 34C in the left wall of the saw cover portion 34, and the locking portion 90C is fitted in the locking hole 34C. As a result, the fixing bolt 90 is coupled to the saw cover portion 34 so as not to rotate relative to the saw cover portion 34 and protrudes leftward from the saw cover portion 34 . The length of the locking portion 90C in the axial direction of the fixing bolt 90 is set so that the locking portion 90C does not protrude leftward from the saw cover portion 34 when the fixing bolt 90 is connected to the saw cover portion 34. ing.

The fixing bolt 90 (the bolt body 90B thereof) is inserted into the link hole 83A of the link 83 so as to be relatively movable, and the tip of the bolt body 90B protrudes leftward from the link 83. As shown in FIG. When adjusting the protrusion amount of the circular saw blade 12, the fixing bolt 90 moves along the longitudinal direction of the link 83 inside the link hole 83A. Specifically, in the initial position of the circular saw body 30, the fixing bolt 90 is arranged at the lower end of the link hole 83A. Although not shown, the circular saw blade 12 does not protrude downward from the base 20 when the fixing bolt 90 is arranged at the upper end of the link hole 83A. That is, at the tilted position of the circular saw body 30, the fixing bolt 90 is arranged between the lower end and the upper end of the link hole 83A. A male screw portion 90D is formed on the outer peripheral portion of the bolt body 90B except for the locking portion 90C.

(Regarding the fixture 92)
The fixture 92 is generally formed in a substantially cylindrical shape whose axis extends in the left-right direction. A female screw portion 92A is formed on the inner peripheral portion of the fixture 92 . A male threaded portion 90D of the fixing bolt 90 is screwed into a female threaded portion 92A on the base end side (right end side) of the fixture 92 , and the fixture 92 is attached to the distal end of the fixing bolt 90 .

As a result, when the fixture 92 is rotated clockwise (one side in the rotation direction) as viewed from the distal end of the fixing bolt 90, the fixture 92 is displaced toward the proximal end of the fixing bolt 90 (toward the link 83). do. Then, when the fixture 92 presses the link 83 to the right side (toward the saw cover portion 34), the fastening bolt 90 and the fixture 92 act on the saw cover portion 34 and the link 83, thereby causing the link 83 (base 20) to move. and the saw cover portion 34 (circular saw body 30) are fixed (hereinafter, this state of the fixture 92 is referred to as a fixed state). On the other hand, in the fixed state of the fixture 92, by rotating the fixture 92 counterclockwise (the other side in the rotation direction), the fixture 92 moves toward the tip side of the fixing bolt 90 (the direction away from the link 83). , and the fixed state between the link 83 (base 20) and the saw cover portion 34 (circular saw body 30) is released (hereinafter, this state of the fixture 92 is referred to as the released state).

A flange portion 92B is formed at the right end portion of the fixture 92, and the flange portion 92B protrudes radially outward of the fixture 92. As shown in FIG. A nut portion 92C as an engaging portion is formed on the left side of the flange portion 92B in the fixture 92, and the outer shape of the nut portion 92C is formed in a regular hexagonal shape. A locking groove 92D is formed on the outer peripheral portion of the fixture 92 on the left side of the nut portion 92C. is formed over the entire circumference of the An E-ring 94 is locked in the locking groove 92D. The outer shape of the nut portion 92C is regular hexagonal in order to transmit the operating force to the first operating lever 96 to the fixture 92, and the polygonal shape enables transmission of high torque. The outer shape of the nut portion 92C may be polygonal, and may be a pentagon or a quadrangle.

(Regarding the first operation lever 96)
The first operating lever 96 is formed in a substantially elongated plate-like shape with the left-right direction as the thickness direction. The first operating lever 96 includes a lever engaging portion 96A forming one end of the first operating lever 96 and a lever arm portion 96B extending from the lever engaging portion 96A. An engaging hole 96C is formed through the lever engaging portion 96A, and the inner peripheral portion of the engaging hole 96C is formed in a zigzag shape. Specifically, a plurality of (12 in this embodiment) engagement grooves 96D are formed in the inner peripheral portion of the engagement hole 96C. The engagement grooves 96D are formed in a substantially V shape that opens toward the center of the engagement hole 96C and are arranged at equal intervals in the circumferential direction of the engagement hole 96C. The nut portion 92C of the fixture 92 is inserted into the engagement hole 96C of the first operating lever 96 from the right side, and the lever engaging portion 96A is attached to the radially outer side of the fixture 92 .

When the lever engaging portion 96A is attached to the fixture 92, the first operating lever 96 and the fixture 92 are aligned in the circumferential direction of the fixture 92 due to the inner peripheral shape of the engaging hole 96C and the outer shape of the nut portion 92C. engaged. As a result, the first operating lever 96 and the fixture 92 are engaged so as to rotate integrally, and the first operating lever 96 and the fixture 92 are switched between the fixed state and the released state. A first operation portion 96E is provided at the tip of the lever arm portion 96B, and the operator grips the first operation portion 96E to input an operation force (rotational force) to the first operation portion 96E. It is designed to In the fixed state of the fixture 92 , the lever arm portion 96B extends obliquely upward and rearward from the lever engaging portion 96A, and the first operating portion 96E extends obliquely upward and rearward with respect to the axis 90E of the fixing bolt 90 . (see FIG. 2). On the other hand, in the released state of the fixture 92 (the state in which the lever arm portion 96B of the first operating lever 96 is in contact with the restricting portion 34E), the lever arm portion 96B extends diagonally upward and forward from the lever engaging portion 96A. 3, the first operating portion 96E is arranged obliquely upward and forward with respect to the axis 90E of the fixing bolt 90 (see the first operating lever 96 indicated by the solid line and the two-dot chain line in FIG. 3). Note that the E-ring 94 restricts the leftward movement of the first operating lever 96 .

The second operating lever 98 is formed in a substantially V-shaped block shape when viewed from the left-right direction. Specifically, the second operating lever 98 includes a lever mounting portion 98A as a mounting portion, a pair of second operating portions 98B1 and 98B2, a mounting hole 98C, and a screw hole portion 98D. there is The lever mounting portion 98A is formed in a substantially bottomed cylindrical shape that opens to the right. The lever mounting portion 98A is externally inserted from the left side into the tip (left end) of the fixture 92 and is rotatably supported by the fixture 92 . A mounting hole 98C is formed through the left wall of the lever mounting portion 98A. A fixing screw 100 as a fastening member is inserted into the mounting hole 98C from the left side and screwed into the female screw portion 92A of the fixture 92. Fixed. That is, the first operating lever 96 and the second operating lever 98 are connected to the fixture 92 so as to rotate integrally therewith. Thereby, the second operating lever 98 is configured to be switched between the fixed state and the released state together with the fixture 92 and the first operating lever 96 . A hexagon socket set screw 102 is screwed into a screw hole portion 98D formed in the side wall of the lever mounting portion 98A. ing. As a result, the hexagon socket set screw 102 generates a pressing force on the second operating lever 98 (screw hole portion 98D) and the fixing screw 100, and the resulting frictional force fixes the fixing screw 100 to the second operating lever 98. It is in good condition. The fixing of the second operating lever 98 to the fixture 92 in the rotational direction is achieved by the pressing force of the fixing screw 100 against the lever mounting portion 98A (the left side surface of the second operating lever 98) and the second The operation lever 98 (screw hole portion 98</b>D) and the frictional force due to the pressing force on the fixing screw 100 are used alone.

The second operating portions 98B1 and 98B2 are formed in a substantially triangular shape when viewed from the left side and extend radially outward from the lever mounting portion 98A. More specifically, the second operating portions 98B1 and 98B2 are connected to the lever mounting portion 98A so that the width dimension of the second operating portions 98B1 and 98B2 becomes smaller toward the outside in the radial direction of the lever mounting portion 98A as viewed from the left side. It is The distance from the axis 90E of the fixing bolt 90 to the tips of the second operating portions 98B1 and 98B2 is set shorter than the distance from the axis 90E of the fixing bolt 90 to the first operating portion 96E. That is, in the radial direction of the fixing bolt 90, the first operating portion 96E is arranged radially outside the second operating portions 98B1 and 98B2. That is, when viewed in the axial direction of the axis 90E, the first operating portion 96E is located outside the second operating portions 98B1 and 98B2 with respect to the axis 90E. Further, if the distance from the axis 90E of the fixing bolt 90 to the tip of the second operating portion 98B1 is L1, and the distance from the axis 90E of the fixing bolt 90 to the tip of the second operating portion 98B2 is L2, then L1>L2. (See enlarged view of part a in FIG. 2). Further, when the vertical distance between the axis 90E of the fixing bolt 90 and the upper surface of the base 20 at the initial position of the circular saw body 30 is L3, it is set so that L3>L1 (part a in FIG. 2). see enlargement). That is, even if the second operating lever 98 is rotated at the initial position of the circular saw body 30, the second operating portions 98B1 and 98B2 and the base 20 are set so as not to interfere with each other. The second operation portion 98B2 is positioned closer to the axis 90E than the first operation portion 96E, and corresponds to the second operation portion in the present invention, like the second operation portion 98B1. The second operation portion 98B2 corresponds to a third operation portion in the present invention as an operation portion located at a position different from the second operation portion 98B1 in the rotational direction about the axis 90E.

On the other hand, the second operating portion 98B1 extends from the lever mounting portion 98A to the opposite side of the lever arm portion 96B of the first operating lever 96 (see FIG. 2). The other second operation portion 98B2 is arranged on one side of the second operation portion 98B1 in the rotation direction when viewed from the left side, and is arranged between the second operation portion 98B1 and the lever arm portion 96B. . Specifically, the angle between the pair of second operation portions 98B1 and 98B2 is set to 90 degrees or more and 180 degrees or less.

In the released state of the fixture 92, one second operating portion 98B1 extends downward from the lever mounting portion 98A and is located below the axis 90E of the fixing bolt 90 and at the first operating lever 96. 1 operating portion 96E (see the second operating lever 98 indicated by the solid line and the two-dot chain line in FIG. 3). In addition, in the released state of the fixture 92, the other second operating portion 98B2 extends upward from the lever mounting portion 98A and is above the axis 90E of the fixing bolt 90 and behind the first operating portion 96E. side (see the second operating lever 98 indicated by the solid line and the two-dot chain line in FIG. 3).

The operating lever biasing spring 104 is configured as a metal plate spring. The operation lever biasing spring 104 is formed in a substantially elongated plate shape extending in the front-rear direction with the left-right direction as the plate thickness direction. A front end portion of the operating lever biasing spring 104 is configured as a spring fixing portion 104A, and a fixing hole 104B is formed through the spring fixing portion 104A. The spring fixing portion 104A is arranged adjacent to the left side of the fixing boss 34D of the saw cover portion 34, and is fastened and fixed to the fixing boss 34D by a spring fixing screw 106. As shown in FIG. Specifically, the spring fixing screw 106 is inserted into the fixing hole 104B and screwed into the fixing boss 34D to fasten and fix the operating lever biasing spring 104 to the saw cover portion 34 .

A rear end portion of the operation lever biasing spring 104 is configured as a mounting portion 104C, and the mounting portion 104C is formed in a substantially annular plate shape. The mounting portion 104C is mounted on the fixture 92. As shown in FIG. Specifically, the mounting portion 104C is externally fitted to the fixture 92 so that the mounting portion 104C is arranged between the flange portion 92B of the fixture 92 and the first operating lever 96 .

In addition, when the fixture 92 is released, the mounting portion 104C is attached to the fixture 92 with the operating lever biasing spring 104 elastically deformed to the right. As a result, the operating lever biasing spring 104 biases the first operating lever 96 to the left, and the lever engaging portion 96A of the first operating lever 96 contacts the E ring 94 . In other words, the left biasing force of the operating lever biasing spring 104 is applied directly to the first operating lever 96 and also to the fixture 92 via the E-ring 94 . Then, the circular saw body 30 is fixed to the base 20 by rotating the first operating lever 96 to shift the fixture 92 from the released state to the fixed state against the biasing force of the operating lever biasing spring 104 . It is configured to

(Effect)
Next, the operation and effects of the present embodiment will be described while describing the method of adjusting the position of the guide member 62 and the method of adjusting the amount of protrusion of the circular saw blade 12. FIG.

(How to adjust the position of the guide member 62)
The guide member 62 is fixed to the base 20 by a guide fixing screw 66 when the guide mechanism 60 is not operated. Further, the switching lever 71 of the adjusting mechanism 70 is arranged at the retracted position, and the lower end of the roller shaft 74 is fitted into the fitting hole 20H of the base 20 . When adjusting the lateral position of the guide member 62 using the adjusting mechanism 70, the fixed state of the guide member 62 by the guide fixing screw 66 is released.

Then, the operator grips the knob 74A of the roller shaft 74 in the roller unit 73 and lifts the roller unit 73 upward against the biasing force of the shaft biasing spring 77 . As a result, the engagement state between the roller shaft 74 and the base 20 is released, and the rotation of the switching lever 71 is permitted. Also, the switching lever 71 is biased toward the adjustment position by a lever biasing spring 76 . Therefore, the biasing force of the lever biasing spring 76 rotates the switching lever 71 to the adjustment position, and the pressing portion 75B of the roller 75 is pressed against the rear surface of the guide member 62 .

In this state, the operator rotates the knob 74A of the roller unit 73. As shown in FIG. As a result, the rotational force input by the operator is transmitted to the guide member 62 by the frictional force generated between the roller 75 and the guide member 62, and the guide member 62 moves relative to the base 20 in the left-right direction. do. As a result, the lateral position of the guide member 62 is adjusted.

After the position adjustment work for the guide member 62 , the guide member 62 is fixed by the guide fixing screw 66 . Further, the operator presses the operation knob 71G of the switching lever 71 against the biasing force of the lever biasing spring 76 to rotate the switching lever 71 from the adjustment position to the retracted position. Thereby, the roller 75 is separated from the guide member 62 . At the retracted position of the switching lever 71 , the biasing force of the shaft biasing spring 77 lowers the roller shaft 74 so that the lower end of the roller shaft 74 is fitted into the fitting hole 20</b>H of the base 20 . As a result, the switching lever 71 is held at the retracted position.

(Method for adjusting the protrusion amount of the circular saw blade 12)
When the circular saw main body 30 and the base 20 are connected and fixed by the protrusion amount adjusting mechanism 80, the fixture 92 presses the link 83 to the right, and the head 90A of the fixing bolt 90 and the flange 92B of the fixture 92 hold the link together. 83 and the saw cover portion 34 are tightened from the outside in the left-right direction. When adjusting the protrusion amount of the circular saw blade 12, the first operating portion 96E of the first operating lever 96 is operated to rotate the first operating lever 96 in the other direction of rotation, thereby fixing the fixture 92. Switch from the state to the released state. As a result, the fixture 92 is separated from the link 83 to the left, and the tightening of the link 83 by the fixture 92 and the saw cover portion 34 is released. In this state, the operator grasps the handle portion 40 of the circular saw body 30 with one hand, holds the base 20 with the other hand, moves the circular saw body 30 relative to the base 20, and The amount of protrusion of the saw blade 12 is adjusted.

After adjusting the amount of projection of the circular saw blade 12 (after determining the position of the base 20 with respect to the circular saw body 30), the operator operates one of the second operating portions 98B1 and 98B2 of the second operating lever 98 with the other hand. Then, the fixture 92 is switched from the released state to the fixed state, and the circular saw main body 30 and the base 20 are temporarily fixed. Specifically, the fixture 92 is rotated in one direction of rotation. As a result, the first operating portion 96E of the first operating lever 96 is arranged rearward and obliquely upward of the fixing bolt 90 . In this state, the operator grips the first operating portion 96E of the first operating lever 96 and applies a rotational force to the first operating lever 96 in one direction of rotation. As a result, the circular saw body 30 and the base 20 are permanently fixed.

As described above, the guide mechanism 60 of the circular saw 10 includes the guide member 62 that is movably connected to the base 20 in the left-right direction, and the adjustment mechanism 70 that adjusts the position of the guide member 62 in the left-right direction. consists of The adjustment mechanism 70 has a roller 75 that abuts on the rear surface of the guide member 62. By rotating the roller 75, the guide member 62 moves in the left-right direction due to the frictional force between the roller 75 and the guide member 62. be moved. Specifically, the outer peripheral surface of the roller 75 is pressed against the rear surface of the guide member 62 by the lever biasing spring 76 , and the guide member 62 moves in the horizontal direction in conjunction with the rotation of the roller 75 . This makes it possible to easily adjust the position of the guide member 62 in the left-right direction. Therefore, it is possible to improve workability during the position adjustment work of the guide member 62 .

Further, as described above, the outer peripheral surface of the roller 75 is pressed against the rear surface of the guide member 62 by the lever biasing spring 76 . That is, the outer peripheral surface of the roller 75 contacts the rear surface of the guide member 62 with a predetermined pressing force. Therefore, even if the roller 75 wears out, the roller 75 is urged toward the guide member 62 by the lever urging spring 76, so that the roller 75 is kept in good pressure contact (pressing) state against the guide member 62. can be maintained. Therefore, the durability of the adjustment mechanism 70 can be improved. Further, since the lever biasing spring 76 biases the roller 75 toward the guide member 62 side (front side), the biasing force of the lever biasing spring 76 moves the guide member 62 toward the base 20 (left guide hole 20E and right guide hole 20E). (front face of hole 20F). This makes it possible to easily set the parallelism of the guide member 62 in the horizontal direction.

Further, the pressing portion 75B of the roller 75 is made of a rubber material. That is, the pressing portion 75B is made of a material having a larger coefficient of friction than metal. Thereby, a relatively large frictional force is generated between the roller 75 and the guide member 62 , and the rotational force input to the roller 75 can be transmitted to the guide member 62 . Although the pressing portion 75B is made of a rubber material, it may be made of a material other than the rubber material as long as it has a coefficient of friction larger than that of metal.

Also, in the adjustment mechanism 70 , the roller 75 is connected to the switching lever 71 . The switching lever 71 is rotatably supported by the rotating shaft 20G of the base 20 and configured to be switchable between an adjustment position and a retracted position. At the adjusted position, the roller 75 is pressed against the guide member 62, and at the retracted position, the roller 75 is separated from the guide member 62 to the rear side. As a result, when the adjustment mechanism 70 is not used, the pressure contact state of the roller 75 against the guide member 62 can be released. As a result, for example, the operation of removing the guide member 62 is simplified, and deformation or the like of the pressing portion 75B of the roller 75 due to aging or the like can be suppressed.

Further, a roller 75 is arranged between the rotating shaft 20G and the circular saw body 30 in the left-right direction. As a result, the roller 75 can be brought into pressure contact with the central portion of the guide member 62 in the longitudinal direction, compared to the case where the roller 75 is arranged on the opposite side of the rotary shaft 20G from the circular saw body 30 . Therefore, the biasing force of the lever biasing spring 76 can be applied to the guide member 62 in a well-balanced manner.

Further, the roller shaft 74 is rotatably connected to the switching lever 71 with the vertical direction as the axial direction, and the roller 75 is connected to the roller shaft 74 so as not to rotate relative to it. A knob 74A of the roller shaft 74 is exposed above the switching lever 71 so as to be operable. As a result, an operator's operating force (rotational force) can be easily input to the roller 75 by operating the knob 74A.

Further, the roller shaft 74 is connected to the switching lever 71 so as to be vertically movable. At the retracted position, the lower end of the roller shaft 74 is fitted into the fitting hole 20H of the base 20 . As a result, the switching lever 71 can be held at the retracted position, and the roller 75 can be kept separated from the guide member 62 . By configuring in this way, it is possible to reproduce the feeling of use of a conventional circular saw that does not have the roller 75 (adjustment mechanism 70).

A shaft biasing spring 77 is attached to the roller shaft 74, and the shaft biasing spring 77 biases the roller shaft 74 downward. As a result, the holding state of the switching lever 71 at the retracted position can be favorably maintained.

In the protrusion amount adjusting mechanism 80, a fixing bolt 90 extending leftward from the saw cover portion 34 of the circular saw body 30 is inserted through a link hole 83A of a link 83 supported by the base 20 so as to be relatively movable. . Then, the fixture 92 is screwed onto the male threaded portion 90D of the fixing bolt 90, and the fixture 92 rotates in one direction in the rotational direction. and tighten. Thereby, the circular saw body 30 is fixed to the base 20 . Here, a first operating lever 96 having a first operating portion 96E and a second operating lever 98 having a pair of second operating portions 98B1 and 98B2 are connected to the fixture 92 so as to be integrally rotatable. . In the fixed state of the fixture 92, the first operating portion 96E is arranged behind the axis 90E of the fixing bolt 90, and the released state of the fixture 92 (when the first operating lever 96 is positioned at the restricted position). , one second operating portion 98B1 is arranged rearwardly and downwardly of the axis 90E of the fixing bolt 90 . As a result, it is possible to improve workability when adjusting the protrusion amount of the circular saw blade 12 .

That is, for example, at the initial position of the circular saw body 30, an operator positioned on the rear side of the circular saw body 30 can operate the first operating portion 96E to switch the fixture 92 between the fixed state and the released state. can be done. Further, for example, when the circular saw body 30 is displaced upward with respect to the base 20 in order to reduce the amount of projection of the circular saw blade 12, the operator operates the first operating portion 96E in the same manner as described above. Then, the fixture 92 is switched from the fixed state to the released state. Further, even if the distance between the fixing bolt 90 and the base 20 is increased at the tilted position of the circular saw main body 30 in which the circular saw main body 30 is displaced upward with respect to the base 20, the fixing bolt 90 and the base 20 do not move. Since the second operating portion 98B1 is arranged between them, the operator can easily access the second operating portion 98B1 with the other hand holding the base 20 .

In more detail, it demonstrates using FIG. When adjusting the amount of protrusion of the circular saw blade 12 , for example, the operator holds the handle portion 40 with the left hand and supports the rear portion of the base 20 with the right hand to adjust the position of the base 20 with respect to the circular saw body 30 . The reason why the rear portion of the base 20 is supported is that the left and right sides and the front side of the operating levers (the first operating lever 96 and the second operating lever 98) to be operated simultaneously are blocked by a portion of the circular saw body 30. be. After the position adjustment is completed, it is necessary to change the state from the released state to the fixed state. Therefore, while supporting the base 20 with the fingers of the right hand (for example, the index finger and the middle finger), the operator uses the other fingers (for example, the thumb) to operate the operation lever (first It is necessary to operate the operating lever 96 and the second operating lever 98). At this time, if an attempt is made to operate the second operating portion 98B2, there is a risk that the finger will not be able to reach it due to the distance from the rear end of the base 20. FIG. In addition, even when the finger reaches the second operating portion 98B2, the second operating portion 98B2 and the rear end of the base 20 are caught by the finger (especially when tightening), so the second operating lever is A force is generated to bring 98 and the rear end of the base 20 closer to each other, which may change the relative positions of the circular saw body 30 and the base 20 .

Here, in the present embodiment, as shown in FIG. 4, the circular saw body 30 is positioned at the position where the protrusion amount of the circular saw blade 12 is the smallest, and the first operating lever 96 is at the regulating position (regulating portion). 34E), at least a portion of the second operating portion 98B1 is located at a position behind and below the axis 90E. In other words, at least a portion of the second operating portion 98B1 is positioned within a range of a circle C passing through the axis 90E centered on the rear end position of the lower surface of the base 20 when viewed in the axial direction of the axis 90E. Therefore, the operator can operate the operating lever at a position close to the rear end position of the supporting base 20 . In particular, when the second operating portion 98B1 is operated to be fixed, the second operating lever 98 can be rotated by applying force F (see FIG. 4) to the second operating portion 98B1. The forward component force F2 or the downward component force F3 can also rotate the second operating lever 98 . Therefore, the operator can fix the operating lever (second operating lever 98) by pushing the second operating portion 98B1 forward while supporting the rear end of the base 20. FIG. In this way, in the state shown in FIG. 4, that is, in a state where the amount of protrusion is minimal and the first operating lever 96 is in contact with the restricting portion 34E, a part of the operating lever (second operating lever 98) is pushed forward. Since the released state can be changed to the fixed state, the above-described "grabbing action" does not occur, and change in the relative position between the circular saw main body 30 and the base 20 can be suppressed. In particular, when the second operating portion 98B1 rotates clockwise from the state shown in FIG. 4, the tightening force F is oriented further forward, so that the temporary fixation can be performed with high precision. Further, since the first operation portion 96E is moved rearward by operating the second operation portion 98B1, the rear end of the base 20 is temporarily fixed by the second operation lever 98 while the rear end of the base 20 is supported. , the final fixation by the first operation lever 96 can be performed. In this manner, the operator can easily switch the fixture 92 from the released state to the fixed state by operating the second operation portion 98B1. As described above, it is possible to improve the workability in adjusting the protrusion amount of the circular saw blade 12 .

In addition, as described above, the fixture 92 has a first operating lever 96 having a first operating portion 96E and a second operating lever 98 having a pair of second operating portions 98B1 and 98B2 so as to be integrally rotatable. Concatenated. That is, the first operating lever 96 having the first operating portion 96E and the second operating lever 98 having the second operating portions 98B1 and 98B2 are configured as separate members. Accordingly, by appropriately changing the mounting positions of the first operating lever 96 and the second operating lever 98 with respect to the fixture 92, the positions of the first operating portion 96E and the second operating portions 98B1 and 98B2 with respect to the fixing bolt 90 can be appropriately adjusted. position can be set. In particular, the first operating lever 96 can only be fixed in a stepwise position by engagement with the nut portion 92C (polygon-shaped portion), while the second operating lever 98 can transmit high torque only by frictional force. It is fixed to the fixture 92 in the rotational direction, and the position in the rotational direction can be changed steplessly. With this configuration, it is possible to perform high-torque tightening (final fixing) by the second operating lever 98 after low-torque tightening (temporary fixing) by the second operating lever 98 fixed at a desired position. and workability can be improved. In this embodiment, the rotation direction position of the second control lever 98 can be changed within an angular range of 360 degrees. may be configured.

The second operating lever 98 includes a cylindrical lever mounting portion 98A rotatably supported at the distal end portion of the fixture 92, a second operating portion 98B1 extending radially outward from the lever mounting portion 98A, 98B2 and. A second operating lever 98 is fixed to the fixture 92 by a fixing screw 100 screwed into the female screw portion 92A on the distal end side of the fixture 92 . This makes it possible to fix the second operating lever 98 to the fixture 92 while easily setting the positions of the second operating portions 98B1 and 98B2 in the circumferential direction of the fixture 92 .

Further, as described above, the second operating lever 98 has a pair of second operating portions 98B1 and 98B2. In the released state of the fixture 92, one second operating portion 98B1 is arranged below the axis 90E of the fixing bolt 90 and rearward of the first operating portion 96E, and the other second operating portion 98B1 is arranged below the axis 90E of the fixing bolt 90 and rearward of the first operating portion 96E. The portion 98B2 is arranged above the axis 90E of the fixing bolt 90 and behind the first operating portion 96E. Therefore, at the initial position of the circular saw body 30, the fixing member 92 can be switched from the released state to the fixed state by operating the second operating portion 98B2. can be operated to switch the fixture 92 from the released state to the fixed state. That is, either one of the second operating portions 98B1 and 98B2 can be selected according to the position of the circular saw body 30, and the fixture 92 can be easily switched from the released state to the fixed state. As a result, it is possible to effectively improve workability when adjusting the protrusion amount of the circular saw blade 12 .

In addition, the first operating portion 96E of the first operating lever 96 is arranged radially outside the second operating portions 98B1 and 98B2 of the second operating lever 98 in the radial direction of the fixing bolt 90 . As a result, while suppressing an increase in the overall size of the protrusion amount adjusting mechanism 80, the second operating portions 98B1 and 98B2 are operated to temporarily fix the fixture 92, and then the first operating portion 96E is operated to fix it. The fixture 92 can be brought into a final fixed state.

(Modified example of protrusion amount adjustment mechanism 80)
Next, a modified example of the protrusion amount adjusting mechanism 80 will be described with reference to FIGS. 12 and 13. FIG. The modified example of the protrusion amount adjusting mechanism 80 is configured in the same manner as the present embodiment except for the following points. 12 and 13, members configured in the same manner as in the present embodiment are given the same reference numerals.

In the modification of the protrusion amount adjusting mechanism 80, the second operating lever 98 of the present embodiment is omitted from the circular saw main body 30. As shown in FIG. That is, the axial length of the fixture 92 is set shorter than that of the present embodiment, and only the first operating lever 96 is connected to the fixture 92 so as to be integrally rotatable.

Further, in a modified example of the protrusion amount adjustment mechanism 80 , a support mechanism 110 that supports the link 83 is provided on the base 20 instead of the support plate 84 and the link support shaft 85 . The support mechanism 110 includes a support plate 112 as a support member, a link bolt 114 as a support shaft, a link nut 116 as a rotating tool, and a second operating lever 118 .

The support plate 112 is formed in a substantially U-shaped plate shape that opens forward in a plan view. Specifically, the support plate 112 includes a plate body 112A whose plate thickness direction is the front-rear direction, a first clamping portion 112B extending forward from the left end of the plate body 112A, and a right end of the plate body 112A. and a second clamping portion 112C extending forward. The plate body 112A is connected to the base 20, and the lower end portion 83B of the link 83 is arranged between the first holding portion 112B and the second holding portion 112C. A lower end portion 83B of the link 83 is formed in a cylindrical shape whose axial direction is the left-right direction, and protrudes leftward compared to other portions of the link 83 .

The link bolt 114 is formed in a substantially columnar shape whose axial direction is the left-right direction. A link bolt 114 spans the first clamping portion 112B and the second clamping portion 112C of the support plate 112 . Also, the link bolt 114 is inserted through the lower end portion 83B of the link 83 to rotatably support the lower end portion 83B. A right end portion of the link bolt 114 is engaged with the second clamping portion 112C so that the link bolt 114 is connected to the support plate 112 so as not to rotate relative to each other.

A flange portion 114A is formed at the right end portion of the link bolt 114, and the flange portion 114A is arranged adjacent to the right side of the second holding portion 112C in the support plate 112. As shown in FIG. This restricts the movement of the link 83 to the left. A left end portion of the link bolt 114 protrudes leftward from the first clamping portion 112B of the support plate 112, and a male screw portion 114B is formed on the outer peripheral portion of the left end portion.

The link nut 116 is formed in a substantially cylindrical shape whose axial direction is the left-right direction, and a female screw portion 116A is formed on the inner peripheral portion of the link nut 116 . Female threaded portion 116A of link nut 116 is screwed into male threaded portion 114B of link bolt 114 , and link nut 116 is attached to the left end of link bolt 114 . By rotating the link nut 116 clockwise (one side in the rotation direction) as viewed from the left side, the link nut 116 is displaced to the right side, and the link nut 116 and the flange portion 114A of the link bolt 114 move the first The clamping portion 112B and the second clamping portion 112C are tightened from the outside in the left-right direction, and the lower end portion 83B of the link 83 is clamped from both sides in the left-right direction by the first clamping portion 112B and the second clamping portion 112C. As a result, rotation of the link bolt 114 of the link 83 about the axis is blocked (hereinafter, this state of the support mechanism 110 is referred to as a blocked state). On the other hand, in the blocked state of the support mechanism 110, by rotating the link nut 116 counterclockwise (on the other side in the rotational direction), the blocked state of the support mechanism 110 is released, and the link bolt 114 of the link 83 rotates around the axis. Rotation is permitted (hereinafter, this state of the support mechanism 110 is referred to as the permitted state).

A right end portion of the link nut 116 is formed with a flange portion 116B projecting radially outward. A nut portion 116C is formed in the link nut 116 on the left side of the flange portion 116B, and the outer shape of the nut portion 116C is formed in a regular hexagonal shape.

The second operating lever 118 is configured similarly to the first operating lever 96 . That is, the second control lever 118 is formed in a substantially elongated plate shape with the left-right direction as the thickness direction. The second operating lever 118 includes a lever engaging portion 118A forming one end of the second operating lever 118 and a lever arm portion 118B extending from the lever engaging portion 118A. An engaging hole 118C is formed through the lever engaging portion 118A, and the inner peripheral portion of the engaging hole 118C is formed in a zigzag shape. The nut portion 116C of the link nut 116 is inserted into the engaging hole 118C of the second operating lever 118 from the right side, and the second operating lever 118 is attached to the link nut 116 so as to be integrally rotatable. A second operation portion 118D is provided at the tip of the lever arm portion 118B, and the operator grips the second operation portion 118D to input an operation force (rotational force) to the second operation portion 118D. It is designed to

As a result, the support mechanism 110 is switched between the blocking state and the permitting state by rotating the second control lever 118 . In the blocking state of the support mechanism 110, the second operating portion 118D is arranged obliquely upward and rearward with respect to the link bolt 114 (see FIGS. 12A and 12B). Further, the second operating lever 118 is arranged on the left side of the first operating lever 96 so that the first operating lever 96 and the second operating lever 118 do not interfere with each other. Further, an E-ring 120 engaged with the link nut 116 restricts leftward movement of the second operating lever 118 .

When adjusting the amount of protrusion of the circular saw blade 12 using the modification of the amount-of-protrusion adjustment mechanism 80, the support mechanism 110 is set to the permitted state. Then, the first operating portion 96E of the first operating lever 96 is operated to rotate the first operating lever 96 in the other rotational direction, thereby switching the fixture 92 from the fixed state to the released state. As a result, the fixture 92 is separated from the link 83 to the left, and the tightening of the link 83 by the fixture 92 and the saw cover portion 34 is released. In this state, the operator grasps the handle portion 40 of the circular saw body 30 with one hand, holds the base 20 with the other hand, moves the circular saw body 30 relative to the base 20, and The amount of protrusion of the saw blade 12 is adjusted.

After adjusting the protrusion amount of the circular saw blade 12, the operator operates the second operating portion 118D of the second operating lever 118 with the other hand to switch the support mechanism 110 from the permitting state to the blocking state. This prevents the link 83 from rotating about the axis of the link bolt 114 . Further, the center of the arc-shaped link 83 is set at a position deviated from the axis of the main body support shaft 82 when viewed in the left-right direction. That is, the locus of rotation of the fixing bolt 90 around the main body support shaft 82 and the link hole 83A of the link 83 are deviated. Therefore, rotation of the link 83 about the axis of the link bolt 114 is prevented, and relative movement of the fixing bolt 90 with respect to the link 83 is prohibited. Therefore, when the support mechanism 110 is blocked, the circular saw body 30 can be temporarily fixed to the base 20 . In this state, the operator grips the first operating portion 96E of the first operating lever 96 and applies a rotational force to the first operating lever 96 in one direction of rotation. As a result, the circular saw body 30 and the base 20 are permanently fixed.

As described above, in the modified example of the protrusion amount adjusting mechanism 80, the second operating lever 118 (second operating portion 118D) for temporarily fixing the circular saw body 30 to the base 20 is positioned on the base 20 side. is provided in That is, the position of the second operating lever 118 with respect to the base 20 does not change even when the circular saw body 30 is placed at the tilted position. As a result, even when the circular saw body 30 is largely displaced upward with respect to the base 20, the other hand holding the base 20 can easily access the second operating portion 118D. Therefore, even in the modified example of the protrusion amount adjusting mechanism 80, it is possible to improve the workability when adjusting the protrusion amount of the circular saw blade 12. FIG.

In addition, in the adjustment mechanism 70 of the present embodiment, the switching lever 71 is rotatably connected to the base 20, and by changing the position of the switching lever 71, the roller 75 is switched between the retracted position and the adjusted position. However, the method of switching the position of the roller 75 is not limited to this. For example, the switching lever 71 may be slidably connected to the base 20 and the position of the switching lever 71 may be changed to switch the roller 75 to the retracted position or the adjustment position.

Further, in the adjusting mechanism 70 of the present embodiment, the switching lever 71 has the switching operation portion 71F and the operation knob portion 71G. good.

Further, in the protrusion amount adjusting mechanism 80 of the present embodiment, the first operating lever 96 and the second operating lever 98 are configured separately, but the first operating lever 96 and the second operating lever 98 are formed as a single component. may be integrally configured as For example, as shown in FIG. 14, the operating lever 108, which is a single component having the first operating portion 96E and the second operating portions 98B1 and 98B2, may be coupled to the fixture 92 so as to rotate integrally therewith. Further, although the second operating portion 98B1 and the second operating portion 98B2 are part of a single component and are configured indivisible, they may be configured as separate components so that their positions can be finely adjusted. .

10 Circular saw (work machine)
12 Circular saw blade (tip tool)
20 Base 20G Rotating shaft 20H Fitting hole 30 Circular saw main body (main body)
51 motor 62 guide member 62B guide plate (guide portion)
70 adjustment mechanism 71 switching lever (switching member)
74 roller shaft (adjustment shaft)
74A knob 75 roller (adjustment member)
76 lever biasing spring (biasing member)
77 shaft biasing spring (shaft biasing member)

Claims (12)

a base that is formed in a plate shape, is placed on the workpiece during machining, and slides on the workpiece in one direction in the first direction;
a main body connected to the base and configured to include a motor and a tip tool operated by the motor;
A guide portion extending in a second direction orthogonal to both the thickness direction of the base and the first direction, is connected to the base movably in the second direction, and abuts the end surface of the workpiece during processing. at one end in the longitudinal direction and guides movement of the base in the first direction during processing;
an adjustment mechanism including an adjustment member that abuts on the guide member, the adjustment mechanism moving the guide member in the second direction by a frictional force between the adjustment member and the guide member by operating the adjustment member; ,
machine equipped with. 2. The adjusting mechanism according to claim 1, wherein the adjusting mechanism has a biasing member that biases the adjusting member toward the guide member, and the adjusting member is biased toward the guide member by the biasing member. working machine. 3. The work machine according to claim 1, wherein a contact portion of said adjusting member with said guide member is made of a material having a coefficient of friction larger than that of metal. The working machine according to any one of claims 1 to 3, wherein the adjustment member is configured to be switched between an adjustment position in contact with the guide member and a retracted position away from the guide member. The adjusting mechanism is provided with a switching member to which the adjusting member is connected, the switching member is movably connected to the base,
The working machine according to claim 4, wherein the adjustment member is switched to the adjustment position or the retracted position by moving the switching member. The working machine according to claim 4 or 5, further comprising a holding mechanism that holds the adjustment member at the retracted position. The base is provided with a rotation shaft whose axial direction is the plate thickness direction of the base,
The switching member is rotatably connected to the rotation shaft,
The working machine according to claim 5, wherein the adjusting member is arranged between the rotating shaft and the main body in the second direction. The switching member is rotatably provided with an adjustment shaft whose axial direction is the plate thickness direction of the base,
8. The working machine according to claim 7, wherein the adjusting member is connected to the adjusting shaft so as not to move relative to each other. The adjusting shaft is connected to the switching member so as to be relatively movable in the axial direction,
The working machine according to claim 8, wherein one end of the adjustment shaft is fitted into a fitting hole formed in the base at the retracted position. The working machine according to claim 9, wherein the adjusting mechanism has a shaft biasing member that biases the adjusting shaft toward one end. The working machine according to claim 9 or 10, wherein a knob is formed on the other end of the adjustment shaft. The working machine according to any one of claims 8 to 11, wherein the adjustment member is configured as a roller that is connected to the adjustment shaft so as not to move relative to the adjustment shaft.

Images