Work equipment

Abstract

The present invention improves workability. In a table circular saw 10, a dust releasing mechanism 70 is provided to side fence sections 32L, 32R of a fence 30 above a base 20. The dust releasing mechanism 70 is configured to include: a first releasing groove section 72 which passes through, in the left-right direction, the lower end section of an abutment surface 32D of the side fence sections 32L, 32R; and a plurality of second releasing groove sections 74 which pass through, in the front-rear direction, the lower end sections of the side fence sections 32L, 32R. Accordingly, when pressing a workpiece W to the abutment surface 32D of the side fence sections 32L, 32R, dust remaining between the side fence sections 32L, 32R and the workpiece W can be released into the first releasing groove section 72 and the second releasing groove sections 74. Thus, it is possible to prevent dust from being interposed between the base 20 and the workpiece W. Accordingly, an operator does not need to remove dust from the base 20 for each cutting process. Thus, it is possible to improve workability for the operator.

Description

Technical Field

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

Background Art

[0002] In the desktop cutting machine (working machine) described in Patent Document 1 below, a fence is provided on the upper surface of a base that constitutes the lower part of the desktop cutting machine. At the time of cutting, the workpiece placed on the base is pressed against the fence to determine the position of the workpiece with respect to the base and the fence. In this state, by lowering the cutting part, cutting processing is performed on the workpiece.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, at the time of cutting with a desktop cutting machine, dust such as chips is generated. In some cases, this dust remains on the placement surface of the base. In this state, when the workpiece is pressed against the fence, the dust may enter between the workpiece and the fence. In this case, the positioning of the workpiece with respect to the base and the fence becomes unstable. When cutting work is performed in this state, the workpiece may not be accurately cut, and the workability of cutting may decrease. Further, when the operator notices that dust is intervening between the workpiece and the fence, it is necessary to remove (clean) the dust on the workpiece and the base. As a result, the work may be interrupted, and the workability may decrease.

[0005] In consideration of the above facts, an object of the present invention is to provide a working machine capable of improving workability.

Means for Solving the Problems

[0006] One or more embodiments of the present invention include a base on which a workpiece is placed on its upper surface, a main body movably connected to the base and for driving a cutting tool for cutting the workpiece, and a fence extending upward from the upper surface of the base and extending in the left-right direction, wherein the base comprises a base body to which the fence is fixed, and a turntable rotatably connected to the base body with the vertical direction as the axial direction, and the fence faces forward and is located on the base The aforementioned A contact surface that restricts the rearward movement of the workpiece placed on the upper surface, and below the contact surface It is provided at the end and the base The work machine has a through-hole located above the upper surface and penetrating in the front-to-back direction, and the through-holes are provided in multiple locations on the part of the fence facing the base body at predetermined intervals in the left-to-right direction.

[0007] One or more embodiments of the present invention are: The base The aforementioned top surface This is more than the contact position between the contact surface and the workpiece. The first upper surface located in front, and the contact position between the contact surface and the workpiece, are more Located at the rear It has a second upper surface, and the second upper surface has, A vertical penetration section is provided that penetrates vertically, and dust that passes through the penetration section is removed via the vertical penetration section. The base This is a work machine that moves downward from the aforementioned upper surface.

[0008] One or more embodiments of the present invention are provided in which the fence is provided with a fixing portion for fixing to the base body, and the contact surface is located in front of the fixing portion, The aforementioned fence Located rearward from the aforementioned fixing part It has a rear wall, before After writing wall bottom The machine is provided with a rear wall penetration section that extends through in the front-to-back direction, and the dust that passes through the penetration section is discharged behind the fence via the rear wall penetration section.

[0009] One or more embodiments of the present invention provide a portion of the fence below the contact surface, in the entire left-right range of the portion facing the base body, recessed rearward from the contact position between the contact surface and the workpiece. Left and right grooves A is provided, and the through portion is Left and right grooves It is a work machine that is connected to it.

[0010] One or more embodiments of the present invention are as described above. Left and right grooves This refers to a work machine installed from one end to the other end in the left-right direction of the aforementioned fence.

[0011] One or more embodiments of the present invention include a fence comprising a main fence fixed to the base so as not to move relative to it, and a subfence connected to the main fence and configured to be movable relative to the main fence, Left and right grooves This is a work machine installed at the lower end of the main fence.

[0012] One or more embodiments of the present invention include a base on which a workpiece is placed on its upper surface, a main body that is movably connected to the base and drives a cutting tool for cutting the workpiece, and the base The aforementioned The base comprises a fence extending upward from the top surface and extending in the left-right direction, and the base comprises a base body to which the fence is fixed, and a turntable rotatably connected to the base body with the vertical direction as the axial direction, and the fence faces forward and is located on the base The aforementioned A contact surface that restricts the rearward movement of the workpiece placed on the upper surface, and below the contact surface It is provided in the part and the base It has a through portion located above the upper surface and penetrating in the front-to-back direction, The base The aforementioned top surface teeth 、 The contact position between the contact surface and the workpiece is greater than The first upper surface located in front, and the contact position between the contact surface and the workpiece, are more Located at the rear It has a second upper surface, and the second upper surface has, Vertical penetrations are provided, and these penetrations are located on the part of the fence facing the base body, and dust that passes through the penetrations is allowed to pass through the vertical penetrations. The base This is a work machine that moves downward from the aforementioned upper surface.

[0013] In one or more embodiments of the present invention, below the abutting surface in the fence, in a portion facing the base body, it is recessed backward from the contact position between the abutting surface and the workpiece Left and right grooves is provided, and the through portion is the Left and right grooves is a working machine that is connected to.

[0014] One or more embodiments of the present invention are the Left and right grooves is a working machine provided from one end to the other end in the left - right direction of the fence.

[0015] One or more embodiments of the present invention are Multiple through-holes are provided at predetermined intervals in the left-right direction. a working machine.

[0016] One or more embodiments of the present invention are The upper and lower through portions are arranged such that at least a portion of them is located in the same position as the through portion in the left-right direction. a working machine.

[0017] One or more embodiments of the present invention, the through portion is the lower end of the fence A notch that penetrates the part in the front-to-back direction. is a working machine.

[0018] One or more embodiments of the present invention are The base the upper surface The penetrating portion is covered from below. is a working machine.

Advantages of the Invention

[0020] ​​​​​​​​​​​​​​​​​​​ [Figure 5] Figure 4 is a bottom view of the fence as seen from below. [Figure 6] Figure 4 is a magnified view of the left side fence section of the fence shown, as seen from below. [Figure 7] This is a cross-sectional view from the left side (cross-sectional view along line 7-7 in Figure 3) showing the dust release mechanism located at the lower end of the side fence section shown in Figure 3. [Figure 8] This is a perspective view showing the area around the left side of the fence of the tabletop circular saw according to the second embodiment. [Figure 9] Figure 8 is a top-view plan showing the area around the left side of the fence of the tabletop circular saw. [Figure 10] Figure 9 shows a cross-sectional view from the left (cross-sectional view along line 10-10 in Figure 9) of the dust relief mechanism provided on the base. [Modes for carrying out the invention]

[0022] (First Embodiment) The tabletop circular saw 10 as a work machine according to the first embodiment will be described below with reference to Figures 1 to 7. The arrows UP, FR, and LH shown in the drawings as appropriate indicate the top, front, and left sides of the tabletop circular saw 10, respectively. In the following description, when the directions of up and down, front and back, and left and right are used, they refer to the up and down direction, front and back direction, and left and right direction of the tabletop circular saw 10, unless otherwise specified. The left and right direction corresponds to the first direction of the present invention, and the front and back direction corresponds to the second direction of the present invention.

[0023] As shown in Figures 1 and 2, the tabletop circular saw 10 is configured as a device for cutting a workpiece W (see Figure 7). The tabletop circular saw 10 includes a base 20 as a base, a fence 30, a circular saw body 50 as the main body, and a dust relief mechanism 70.

[0024] (About the base 20) The base 20 constitutes the lower end of the tabletop circular saw 10 and is configured as a platform on which the workpiece W is placed. The base 20 has a base body 22 and a turntable 24. The base body 22 is formed in a substantially flat shape with the vertical direction being the thickness direction. The base body 22 has a predetermined material relief portion that is open to the lower side, so that the base body 22 is formed in a concave shape that is open to the lower side. A base recess 22A that is open to the upper side is formed in the approximate left-right center of the base body 22, and the left-right outer portion of the base recess 22A in the base body 22 is configured as a side base portion 22B.

[0025] The turntable 24 is positioned in the base recess 22A. The turntable 24 is formed in a substantially bottomed cylindrical shape that is open to the bottom, and the central part of the turntable 24 is rotatably supported by the base body 22 with the vertical direction as the axial direction. The upper surface of the turntable 24 and the upper surface of the side base portion 22B are flush with each other. This allows the orientation of the cut surface of the workpiece W to be changed during cutting by placing the workpiece W on the upper surface of the turntable 24 and rotating the turntable 24. The turntable 24 is integrally formed with a front table portion 24A that protrudes forward and a rear table portion 24B that protrudes backward.

[0026] (Regarding the fence 30) As shown in Figures 1 to 7, the fence 30 extends in the left-right direction and is positioned above the base 20. When cutting the workpiece W, the workpiece W is pressed against the fence 30 from the front to determine the position of the workpiece W relative to the base 20 and the fence 30 (see Figure 7). The fence 30 is composed of side fence sections 32L and 32R, which constitute the left-right sides of the fence 30, and a center fence section 34 that connects the side fence sections 32L and 32R. The side fence sections 32L and 32R are fixed so that they cannot move relative to the base body 22.

[0027] The side fence sections 32L and 32R are formed in a concave shape that opens upward when viewed from the left and right directions. Specifically, a fence groove section 32A is formed in the middle of the front-to-back direction of the side fence sections 32L and 32R, and the fence groove section 32A is open upward and penetrates in the left-to-right direction. In addition, the extended length of the left side fence section 32L is set to be slightly shorter than the extended length of the right side fence section 32R. Multiple (two in this embodiment) fixed bosses 32B (Figures 5 and 6) are formed on the side fence section 32L, and the fixed bosses 32B are formed in a substantially stepped cylindrical shape with the vertical direction as the axial direction, and extend downward from the bottom wall of the fence groove section 32A. Furthermore, the side fence section 32R has multiple (two in this embodiment) fixing bosses 32C (Figure 5) formed thereon. The fixing bosses 32C are formed in a roughly stepped elliptical cylindrical shape with the vertical direction as the axial direction and the front-to-back direction as the longitudinal direction, and extend downward from the bottom wall of the fence groove section 32A. Fixing bolts (not shown) are inserted from above into the fixing bosses 32B and 32C and screwed into the side base section 22B, thereby fixing the side fence sections 32L and 32R to the base body 22.

[0028] The front surfaces of the side fence sections 32L and 32R are configured as contact surfaces 32D, and the contact surfaces 32D are arranged along a plane perpendicular to the front-rear direction. During cutting, the rear surface of the workpiece W, which is placed on the front part of the base 20 (the part of the base 20 in front of the fence 30), is pressed against the contact surface 32D to determine the position of the workpiece W relative to the base 20 and the fence 30.

[0029] Furthermore, the upper surfaces of the inner ends of the side fence sections 32L and 32R are sloped downwards as they move inward in the left-right direction (towards the center of the fence 30) when viewed from the front. This suppresses interference between the circular saw body 50 and the side fence sections 32L and 32R when the circular saw body 50 is tilted, as will be described later.

[0030] The center fence section 34 is formed in a roughly semi-circular shape that opens to the front when viewed from above. The center fence section 34 is located behind the side fence sections 32L and 32R, and both longitudinal ends of the center fence section 34 are connected to the left and right inner ends of the side fence sections 32L and 32R. Furthermore, the front surface of the center fence section 34, when viewed from its longitudinal direction, slopes radially inward as it moves downward.

[0031] The fence 30 is made of metal. The fence 30 is formed by casting. Specifically, a material relief section corresponding to the outer shape of the fence 30 is formed on the inside of the fence 30, and the fence 30 is formed in a concave shape that opens downwards. Multiple reinforcing ribs 30A are formed on the inside of the fence 30, and the reinforcing ribs 30A are formed in a roughly grid pattern when viewed from below.

[0032] Furthermore, the left-right inner portions of the side fence sections 32L and 32R and the lower surface of the center fence section 34, including the reinforcing rib 30A, are configured as an offset surface 30B (see the hatched portion in Figure 5). The offset surface 30B is positioned at least vertically opposite to the turntable 24 and is offset upward relative to the lower surface of the fence 30. As a result, the turntable 24 and the offset surface 30B are positioned vertically opposite each other with a predetermined gap between them, and this gap allows the turntable 24 to rotate.

[0033] Furthermore, a sub-fence 36 is provided above the side fence sections 32L and 32R. The sub-fence 36 is formed in a roughly box-like shape with a relatively shallow bottom that opens to the rear. A rail section 36A protruding downwards is formed on the lower wall of the sub-fence 36, and the rail section 36A is slidably inserted in the fence groove section 32A of the side fence sections 32L and 32R in the left-right direction. The front surface of the sub-fence 36 is flush with the contact surface 32D of the side fence sections 32L and 32R. The sub-fence 36 is configured to allow relative movement in the left-right direction with respect to the base body 22 by operating a fixing knob (not shown) to weaken the fixing force to the base body 22.

[0034] As shown in Figures 1 to 3, the left side base portion 22B of the aforementioned base body 22 is provided with a vise device 40 for fixing the workpiece W to the base body 22. The vise device 40 has a vise shaft 41 that extends vertically from the rear of the side fence portion 32L, and an arm 42 that extends forward from the upper end of the vise shaft 41. The vise device 40 also has a screw shaft 43 that is screwed into the front end of the arm 42 and extends vertically, a knob 44 provided at the upper end of the screw shaft 43, and a vise plate 45 provided at the lower end of the screw shaft 43. The workpiece W is placed below the vise plate 45, and the knob 44 is rotated to lower the screw shaft 43 and the vise plate 45, thereby pressing the workpiece W downwards with the vise plate 45 and fixing it to the base 20.

[0035] (Regarding the circular saw body 50) As shown in Figures 1 and 2, the circular saw body 50 is composed of a hinge mechanism 51 and a head portion 60.

[0036] The hinge mechanism 51 has a first hinge 52 and a second hinge 53. The first hinge 52 is formed in a substantially elongated box shape that extends vertically and is open to the rear. The first hinge 52 is positioned behind the rear table portion 24B of the turntable 24, and the lower end of the first hinge 52 is rotatably connected to the rear table portion 24B by a first connecting shaft 54 ​​whose axial direction is in the front-rear direction. This allows the circular saw body 50 to be tilted to the right or left relative to the position shown in Figure 1. The first hinge 52 has an elongated hole (not shown) that extends in the circumferential direction of the first connecting shaft 54 ​​on the radially outer side of the first connecting shaft 54. A fixing bolt is inserted into this elongated hole, and the fixing bolt is screwed into the rear table portion 24B, fixing the first hinge 52 to the turntable 24. On the other hand, the configuration allows the first hinge 52 to rotate around the axis of the first connecting shaft 54 ​​by releasing the fastening of the fixing bolt.

[0037] The upper part of the first hinge 52 is inclined to the right as it extends upward, and the upper end of the first hinge 52 is positioned to the right of the lower end of the first hinge 52. A pair of upper and lower support shafts 55 are provided at the upper end of the first hinge 52. The support shafts 55 are oriented axially in the front-rear direction and extend forward from the first hinge 52.

[0038] The second hinge 53 includes a connecting portion 53A that is slidably connected to the support shaft 55 in the front-rear direction, and a hinge portion 53B that extends to the left from the connecting portion 53A. The connecting portion 53A is provided with a fixing screw 56 that is configured to abut against the support shaft 55, and the forward-rear movement of the second hinge 53 is restricted when the tip of the fixing screw 56 abuts against the support shaft 55.

[0039] The head portion 60 is positioned in front of the hinge portion 53B of the second hinge 53, and the rear end of the head portion 60 is rotatably supported by the hinge portion 53B by a second connecting shaft 61 whose axis is oriented in the left-right direction. Specifically, the hinge portion 53B is formed in a concave shape that opens upward when viewed from the front-rear direction, and the rear end of the head portion 60 is inserted into the hinge portion 53B, with the second connecting shaft 61 spanning across the hinge portion 53B. The head portion 60 is also held by a holding mechanism (not shown). When viewed from the left, the head portion 60 is rotated clockwise around the second connecting shaft 61 to the forward-tilting position shown in Figures 1 and 2, so that the circular saw blade 64, described later, is inserted from above between the side fence portions 32L and 32R, and the circular saw blade 64 cuts the workpiece on the base 20.

[0040] A motor housing 60A is formed at the upper end of the head portion 60, protruding to the left, and a motor 62 is housed within the motor housing 60A. A handle portion 60B is formed at the front end of the head portion 60, and a trigger 63 is provided on the handle portion 60B so as to be pullable. A switch (not shown) is also provided within the handle portion 60B, and is configured to turn on when the trigger 63 is pulled. The switch and the motor 62 are electrically connected to a control unit (not shown). As a result, when the trigger 63 is pulled, the motor 62 is driven by the control unit.

[0041] The head portion 60 is equipped with a circular saw blade 64 as a cutting tool at the rear of the handle portion 60B and below the motor housing portion 60A. The circular saw blade 64 is formed in a substantially circular disc shape with the left-right direction being the thickness direction. The central part of the circular saw blade 64 is rotatably supported by a transmission mechanism 65, which transmits the driving force of the motor 62 to the circular saw blade 64. As a result, the circular saw blade 64 rotates when driven by the motor 62, performing a cutting operation on the workpiece.

[0042] A duct section 66 is integrally formed on the head section 60 behind the circular saw blade 64. The duct section 66 is formed in a cylindrical shape that extends substantially vertically. The lower end of the duct section 66 is configured as a duct inlet section 66A, which is formed in a substantially U-shape that opens to the front (towards the circular saw blade 64) in a plan view and is positioned behind the vertical center of the circular saw blade 64. The upper end of the duct section 66 is configured as a duct outlet section 66B, which is formed in a substantially cylindrical shape and protrudes diagonally upward and backward from the head section 60. The upper end of the duct outlet section 66B is configured to allow the attachment of a dust bag 67 (see Figure 2). During the cutting process, dust such as saw chips scattered from the circular saw blade 64 is inserted into the duct section 66 through the duct inlet 66A and discharged into the dust bag 67 through the duct outlet 66B. This collects the dust into the dust bag 67.

[0043] (Regarding the dust relief mechanism 70) As shown in Figures 1, 3 to 7, the dust relief mechanism 70 is provided on the side fence sections 32L and 32R of the fence 30, respectively. The dust relief mechanism 70 provided on the side fence section 32L and the dust relief mechanism 70 provided on the side fence section 32R are configured symmetrically with respect to the left-right center of the tabletop circular saw 10, except for the points shown below. For this reason, the following explanation will focus on the dust relief mechanism 70 provided on the side fence section 32L, and the explanation of the dust relief mechanism 70 provided on the side fence section 32R will be omitted as appropriate.

[0044] The dust relief mechanism 70 is configured to release dust between the workpiece W placed on the base 20 and the side fence section 32L toward the side fence section 32L, and to discharge it to both the left and right sides of the side fence section 32L and to the rear side of the side fence section 32L. In this embodiment, the dust relief mechanism 70 is a notch formed at the lower end (below the contact surface 32D) of the side fence sections 32L and 32R. The dust relief mechanism 70 (notch) is provided at the lower end of the side fence section 32L and is configured to include a first relief groove 72 and a plurality (three locations in this embodiment) of second relief grooves 74. The dust relief mechanism 70 provided on the side fence section 32R is configured to include a first relief groove 72 and four second relief grooves 74.

[0045] The first relief groove 72 is formed at the lower end of the contact surface 32D of the side fence portion 32L. The first relief groove 72 penetrates along the left-right direction and is formed in a stepped shape that opens downwards and forwards when viewed from the left-right direction. In this embodiment, the vertical dimension of the first relief groove 72 is set so that a relatively thin plate-shaped workpiece W does not get stuck inside the first relief groove 72. As an example, the vertical dimension of the first relief groove 72 is set to 1.5 mm.

[0046] The second relief groove 74 is formed at the lower end of the side fence section 32L. The second relief groove 74 penetrates along the front-rear direction and, in a front view, is formed as a groove that opens downwards. That is, the second relief groove 74 is formed at the lower end of the outer peripheral walls (front and rear walls) of the side fence sections 32L and 32R and the reinforcing rib 30A, and penetrates in the front-rear direction. As a result, the front end of the second relief groove 74 communicates with the first relief groove 72. In the case of the second relief groove 74 located furthest inward in the left-right direction, an offset surface 30B is formed in place of the second relief groove 74 at the rear wall of the side fence section 32L.

[0047] The width dimension (horizontal dimension) of the second relief groove 74 is set to be significantly larger than the groove depth (vertical dimension) of the second relief groove 74. Furthermore, the groove depth of the second relief groove 74 is set to be larger than the groove depth (vertical dimension) of the first relief groove 72, and is set to match the offset distance from the lower surface of the fence 30 on the offset surface 30B. In other words, the upper surface of the second relief groove 74 and the offset surface 30B are positioned above the upper surface of the first relief groove 72.

[0048] Furthermore, a chamfered portion 74A (see Figure 7) is formed on the front opening edge of the second relief groove 74. In addition, multiple second relief grooves 74 are arranged side by side with a predetermined interval between them in the left-right direction.

[0049] (Effects and Effects) Next, the effects and effects of this embodiment will be described.

[0050] In the cutting operation of the tabletop circular saw 10 configured as described above, the workpiece W is placed on the base 20 in front of the fence 30. Then, the workpiece W is moved to the rear and pressed against the contact surface 32D of the side fence sections 32L and 32R. This determines the position of the workpiece W relative to the base 20 and the side fence sections 32L and 32R. In this state, by operating the knob 44 of the vise device 40, the workpiece W is pressed from above by the vise plate 45 and fixed to the base 20. Then, the operator grasps the handle section 60B and tilts the head section 60 forward, thereby performing the cutting operation on the workpiece with the circular saw blade 64.

[0051] At this time, dust such as chips generated during the cutting process is rolled up to the rear by the circular saw blade 64 and inserted into the duct section 66 from the duct inlet 66A, and discharged into the dust bag 67 from the duct outlet 66B. As a result, the dust is collected in the dust bag 67.

[0052] Incidentally, while dust generated during cutting may be collected in a dust bag 67 as in this embodiment, dust that is not collected in the dust bag 67 may remain on the base 20 or the workpiece W. As the cutting process is repeated, the remaining dust accumulates on the base 20 (between the workpiece W and the side fence sections 32L and 32R). When the workpiece W is moved for positioning after each cutting process, the dust on the base 20 is pushed towards the side fence sections 32L and 32R by the workpiece W, and accumulates between the side fence sections 32L and 32R and the workpiece W. As a result, the accumulated dust prevents the workpiece W from being pressed against the side fence sections 32L and 32R without any gaps, and the position of the workpiece W relative to the base 20 and fence 30 changes. As a result, if the workpiece W is cut in this state, the angle of the cut surface formed on the workpiece W (angle viewed from the front and back, angle viewed from above, etc.) may deviate from the set angle, potentially reducing the processing accuracy of the workpiece W. Therefore, in order to suppress the decrease in processing accuracy, the operator needs to remove dust from the base 20 (dust between the side fence sections 32L and 32R and the workpiece W, and between the base 20 and the workpiece W). Consequently, there is a risk that the workability during cutting will deteriorate.

[0053] Here, a dust relief mechanism 70 is provided in the side fence sections 32L and 32R of the fence 30 located on the upper side of the base 20. The dust relief mechanism 70 is composed of a first relief groove 72 and a plurality of second relief grooves 74. The first relief groove 72 is formed at the lower end of the contact surface 32D of the side fence sections 32L and 32R and penetrates in the left-right direction. The second relief grooves 74 penetrate in the front-rear direction at the lower end of the side fence sections 32L and 32R. Therefore, when the workpiece W is pressed against the contact surface 32D of the side fence sections 32L and 32R, dust remaining on the base 20 (between the side fence sections 32L and 32R and the workpiece W) can be pushed into the first relief groove 72 and the second relief grooves 74 by moving the workpiece W for positioning. This allows dust on the base 20 (between the side fence sections 32L and 32R and the workpiece W) to escape into the first relief groove 72 and the second relief groove 74, thereby suppressing the accumulation of dust between the workpiece W and the contact surfaces 32D of the side fence sections 32L and 32R, and between the base 20 and the workpiece W. In other words, with each cutting operation on the workpiece W, any dust remaining on the base 20 (between the side fence sections 32L and 32R and the workpiece W) is released into the first relief groove 72 and the second relief groove 74, thus suppressing the accumulation of dust on the base 20 (between the side fence sections 32L and 32R and the workpiece W). Consequently, it is possible to suppress the maintenance of a state in which dust remains (is present) between the base 20 and the workpiece W. This allows for accurate positioning of the workpiece W relative to the side fence sections 32L and 32R and the base 20, enabling cutting of the workpiece W.

[0054] Furthermore, the first relief groove 72 penetrates in the left-right direction. In other words, the left end of the first relief groove 72 is open to the left, and the right end is open to the right. Therefore, dust that has escaped into the first relief groove 72 can be discharged outward in the left-right direction from both left-right ends of the first relief groove 72. Note that the first relief groove 72 may be configured so that one end is open in the left-right direction. Also, the second relief groove 74 penetrates in the front-rear direction. Therefore, dust that has escaped into the second relief groove 74 can be discharged from the rear end of the second relief groove 74 to the rear of the side fence sections 32L and 32R. When the tabletop circular saw 10 is in operation, vibrations caused by the motor 62 are transmitted to the base 20, causing the tabletop circular saw 10 (i.e., the base 20) to vibrate. As a result, the vibration causes the dust to move within the first relief groove 72 and is discharged from both the left and right ends of the first relief groove 72. In other words, in this embodiment, the dust that has moved to the first relief groove 72 or the second relief groove 74 can be further moved by the motor 62, causing the dust to move to the outside of the base 20. The dust also moves within the second relief groove 74 and is discharged from the rear end of the second relief groove 74. As a result, with the tabletop circular saw 10 of this embodiment, the need for the operator to remove dust from the base 20 (between the side fences 32L and 32R and the workpiece W, and between the base 20 and the workpiece W) after each cutting operation is reduced. Therefore, the work efficiency for the operator can be improved.

[0055] Furthermore, the dust relief mechanism 70 is provided at the lower ends of the side fence sections 32L and 32R. That is, the dust relief mechanism 70 is positioned on the rear side (opposite side from the workpiece W) of the contact surface 32D that the workpiece W contacts. This prevents the dust relief mechanism 70 from being positioned in the working area of ​​the base 20 (the area on which the workpiece W is placed, and which is in front of the side fence sections 32L and 32R), while still allowing the dust relief mechanism 70 to be installed on the tabletop circular saw 10. Thus, the impact on workability caused by the installation of the dust relief mechanism 70 can be minimized.

[0056] Furthermore, the upper surface of the second relief groove 74 is positioned above the upper surface of the first relief groove 72. That is, the vertical dimension of the second relief groove 74 is set to be larger than the vertical dimension of the first relief groove 72. This allows, for example, a workpiece W with a relatively thin plate thickness to be prevented from getting stuck in the first relief groove 72, while simultaneously pushing (moving) dust on the base 20, particularly between the side fence sections 32L and 32R and the workpiece W, into the first relief groove 72 and the second relief groove 74. In addition, the dust pushed into the second relief groove 74 by the workpiece W can be efficiently discharged from the second relief groove 74 to the rear side of the side fence sections 32L and 32R.

[0057] In the first embodiment, the upper surface of the second relief groove 74 is positioned above the upper surface of the first relief groove 72. However, the vertical position of the upper surface of the second relief groove 74 may be set so that it is flush with the upper surface of the first relief groove 72.

[0058] (Second Embodiment) Next, the tabletop circular saw 100 as a work machine according to the second embodiment will be described with reference to Figures 8 to 10. The tabletop circular saw 100 of the second embodiment is configured in the same way as the tabletop circular saw 10 of the first embodiment, except for the points shown below. In Figures 8 to 10, the same reference numerals are used for parts that are configured in the same way as the tabletop circular saw 10 of the first embodiment.

[0059] In other words, in the second embodiment, the dust relief mechanism 70 is omitted in the fence 30, and the dust relief mechanism 110 (discharge section) is provided on the base body 22 of the base 20. The dust relief mechanism 110 (discharge section) is provided on the left and right side base sections 22B of the base body 22, respectively. The dust relief mechanism 110 provided on the left side base section 22B and the dust relief mechanism 110 provided on the right side base section 22B are configured symmetrically with respect to the left-right center of the tabletop circular saw 10, except for the points shown below. For this reason, in the following description, the dust relief mechanism 110 provided on the left side base section 22B will be described, and the description of the dust relief mechanism 110 provided on the right side base section 22B will be omitted as appropriate.

[0060] The dust relief mechanism 110 is composed of a first relief groove 112 and a plurality (five locations in this embodiment) of second relief grooves 114. The dust relief mechanism 110 provided on the right side base portion 22B is composed of a first relief groove 112 and seven second relief grooves 114.

[0061] The first relief groove 112 is formed on the upper surface of the side base portion 22B. The first relief groove 112 is formed in the shape of a groove that is open upward and extends along the left-right direction, and penetrates in the left-right direction. In a plan view, the first relief groove 112 is located in front of the side fence portion 32L such that the contact surface 32D of the side fence portion 32L is positioned within the middle portion of the first relief groove 112 in the front-rear direction. That is, when viewed from the left-right direction, the lower end of the side fence portion 32L protrudes forward relative to the rear surface of the first relief groove 112. That is, the contact surface 32D is located in front of the rear surface of the first relief groove 112. A guide portion 32E is formed at the lower end of the contact surface 32D of the side fence portion 32L, and the guide portion 32E is configured as an inclined surface that slopes forward as it goes upward. Furthermore, in the front-to-back direction, the lower end position of the guide portion 32E and the rear surface position of the first relief groove portion 112 coincide, but they do not have to coincide. At least a portion of the first relief groove portion 112 (dust relief mechanism 110) is located in front of (towards the circular saw body 50) the contact range (mounting location) between the side fence portion 32L and the side base portion 22B.

[0062] The second relief groove 114 is formed on the bottom surface of the first relief groove 112 and penetrates vertically. The second relief groove 114 is formed in the shape of an elongated hole (slit) with the left-right direction as its longitudinal direction, and the dimensions of the first relief groove 112 and the dimensions of the second relief groove 114 in the front-rear direction coincide. Multiple second relief grooves 114 are arranged side by side with a predetermined interval between them in the left-right direction. At least a portion of the second relief groove 114 is located in front of (towards the circular saw body 50) the contact area (mounting location) between the side fence portion 32L and the side base portion 22B.

[0063] During the cutting process, when the workpiece W is pressed against the contact surface 32D of the side fence sections 32L and 32R from the front, dust remaining on the base 20, particularly between the side fence sections 32L and 32R and the workpiece W, moves to the rear as the workpiece W is moved for positioning, and falls into the first relief groove 112 and the second relief groove 114. In other words, the dust moves to the dust relief mechanism (first relief groove 112 and second relief groove 114) as the workpiece W is pressed against the contact surface 32D. Furthermore, dust that falls into the second relief groove 114 falls within the second relief groove 114 and is discharged to the underside of the base 20. As a result, in the second embodiment as well, after each cutting operation on the workpiece W, dust remaining on the base 20 (between the side fence sections 32L, 32R and the workpiece W) is released into the first relief groove section 112 and the second relief groove section 114, thereby suppressing the accumulation of dust on the base 20. Therefore, during cutting, it is possible to suppress the presence of dust between the side fence sections 32L, 32R and the workpiece W, and consequently between the base 20 and the workpiece W. In addition, in the second embodiment as well, the vibrations generated when the motor 62 is driven cause dust to move within the first relief groove section 112 and be discharged from both the left and right ends of the first relief groove section 112 and the second relief groove section 114. Therefore, in the second embodiment as well, the workability for the operator can be improved.

[0064] Furthermore, in the second embodiment, the first relief groove 112 is positioned adjacent to the front side of the side fences 32L and 32R in a plan view. As a result, when the workpiece W is moved for positioning, dust moves to the rear side, and the dust that has moved to the rear side can fall into the first relief groove 112. At this time, the dust is blocked by the side fences 32L and 32R, which improves the reliability of the dust falling into the first relief groove 112.

[0065] Furthermore, in the second embodiment, the contact surfaces 32D (lower ends) of the side fence sections 32L and 32R are positioned in front of (protruding forward from) the rear surface of the first relief groove section 112, and are located above the rear end of the opening in the first relief groove section 112. In addition, a guide section 32E is formed at the lower end of the contact surfaces 32D of the side fence sections 32L and 32R, and the guide section 32E is configured as an inclined surface that slopes forward as it moves upward when viewed from the left and right directions. As a result, when the side fence sections 32L and 32R block dust moving to the rear, the guide section 32E changes the direction of the dust downward, allowing the dust to fall well into the first relief groove section 112.

[0066] In the first embodiment, the dust relief mechanism 70 is configured to include a first relief groove 72 and a plurality of second relief grooves 74, but one of the first relief groove 72 and the second relief grooves 74 may be omitted. Even in this case, dust remaining on the base 20 can be released into the first relief groove 112 or the second relief groove 114, thereby preventing dust from being interposed between the workpiece W and the side fences 32L and 32R. Similarly, in the dust relief mechanism 110 of the second embodiment, one of the first relief groove 112 and the second relief groove 114 may be omitted.

[0067] Furthermore, the features of the first and second embodiments can be combined as appropriate; that is, the dust relief mechanism 70 (110) may be configured to be provided on the fence 30 and the base 20. For example, as shown by the dashed line in Figure 7, a third relief groove 76 with the left-right direction as the longitudinal direction may be formed through the side base portion 22B, and the third relief groove 76 may be arranged to overlap with the second relief groove 74. In the present invention, the dust relief mechanism may be provided on only one of the fence 30 and the base 20, or on both. That is, the notch of the fence 30 and the discharge portion of the base 20 may be implemented on only one, or on both. Also, in the second embodiment, a part of the first relief groove 112 and the second relief groove 114 are located in the range behind the contact surface 32D, but they may all be located in front of the contact surface 32D. [Explanation of Symbols]

[0068] 10...Tabletop circular saw (working implement), 20...Base (base), 22...Base body, 24...Turntable, 32L...Side fence section (fence section), 32R...Side fence section (fence section), 32D...Contact surface, 50...Circular saw body (body section), 70...Dust relief mechanism (notch section), 72...First relief groove section, 74...Second relief groove section, 100...Tabletop circular saw (working implement), 110...Dust relief mechanism (discharge section)

Claims

1. A base on which the workpiece is placed, A main body that is movably connected to the base and drives a cutting tool for cutting the workpiece, A fence extending upward from the upper surface of the base and extending in the left-right direction, Equipped with, The aforementioned base is The base body to which the fence is fixed, A turntable rotatably connected to the base body with the vertical direction as the axial direction, It is composed of including, The fence has a contact surface facing forward that restricts the rearward movement of the workpiece placed on the upper surface of the base, and a through portion provided at the lower end of the contact surface and located above the upper surface of the base, which penetrates in the front-rear direction. The aforementioned penetrations are work machines provided in multiple locations on the fence opposite the base body, at predetermined intervals in the left-right direction.

2. The upper surface of the base has a first upper surface located in front of the contact position between the abutment surface and the workpiece, and a second upper surface located behind the contact position between the abutment surface and the workpiece, The work machine according to claim 1, wherein the second upper surface is provided with an upper and lower penetration portion that penetrates in the vertical direction, and dust that has passed through the penetration portion is moved downward from the upper surface of the base via the upper and lower penetration portion.

3. The fence is provided with a fixing part for fixing it to the base body. The contact surface is located in front of the fixing portion, and the fence has a rear wall located behind the fixing portion. A rear wall penetration portion is provided at the lower part of the aforementioned rear wall, which penetrates in the front-to-back direction. The work machine according to claim 1, wherein dust that has passed through the penetration is discharged to the rear of the fence via the rear wall penetration.

4. The work machine according to claim 1, wherein below the contact surface of the fence, left and right grooves are provided over the entire left-right range of the portion facing the base body, recessing backward from the contact position between the contact surface and the workpiece, and the through portion is connected to the left and right grooves.

5. The work machine according to claim 4, wherein the left and right grooves are provided from one end to the other end in the left-right direction of the fence.

6. The aforementioned fence, A main fence fixed to the base so as not to move relative to it, A sub-fence connected to the main fence and configured to be movable relative to the main fence, It has, The work machine according to claim 4, wherein the left and right grooves are provided at the lower end of the main fence.

7. A base on which the workpiece is placed, A main body that is movably connected to the base and drives a cutting tool for cutting the workpiece, A fence extending upward from the upper surface of the base and extending in the left-right direction, Equipped with, The aforementioned base is The base body to which the fence is fixed, A turntable rotatably connected to the base body with the vertical direction as the axial direction, It is composed of including, The fence has a contact surface facing forward that restricts the rearward movement of the workpiece placed on the upper surface of the base, and a through portion provided below the contact surface and located above the upper surface of the base, which penetrates in the front-rear direction. The upper surface of the base has a first upper surface located forward of the contact position between the abutment surface and the workpiece, and a second upper surface located backward of the contact position between the abutment surface and the workpiece. The second upper surface is provided with an upper and lower penetration portion that penetrates in the vertical direction. The aforementioned penetration portion is provided in the part of the fence facing the base body, and the work machine moves the dust that has passed through the penetration portion downward from the upper surface of the base via the upper and lower penetration portions.

8. The work machine according to claim 7, wherein below the contact surface of the fence, in the portion facing the base body, left and right grooves are provided that are recessed rearward from the contact position between the contact surface and the workpiece, and the through portion is connected to the left and right grooves.

9. The work machine according to claim 8, wherein the left and right grooves are provided from one end to the other end in the left-right direction of the fence.

10. The work machine according to claim 7, wherein the aforementioned through-holes are provided in multiple locations at predetermined intervals in the left-right direction.

11. The work machine according to claim 7, wherein at least a portion of the upper and lower through portions is arranged to be in the same position as the through portion in the left-right direction.

12. The work machine according to claim 1 or claim 7, wherein the penetration portion is a notch that penetrates the lower end of the fence in the front-rear direction.

13. The work machine according to claim 12, wherein the upper surface of the base covers the through portion from below.

Images