Portable cutting machine for woodworking

Abstract

In the rechargeable electric router capable of installing the battery, the upper part of the main body part is provided with a battery installing part, and the left side part and the right side part are provided with holding parts for a user to hold. The battery is attached and detached by moving in the left-right direction. Therefore, when a small battery and a large battery with different installation capacities are replaced, the center of gravity of the main body part is displaced. Therefore, the weight balance of the electric router becomes poor, and the operability of the electric router during moving operation is damaged. The invention provides a portable cutting machine for woodworking. The portable cutting machine for woodworking can maintain good operability under the condition that various batteries are replaced and installed. The battery mounting section (21) holds one battery (3) in a posture in which the longitudinal direction (L3) of the battery (3) is at an angle of 70-90 degrees with respect to an imaginary plane (K) including the left support member (11) and the right support member (12). Accordingly, even if the capacity of the battery (3) changes, the center-of-gravity position of the main body part (20) does not change greatly in the left-right direction, and therefore weight balance is maintained and good operability is maintained.

Description

Technical Field

[0001] The present application relates to a portable woodworking cutting machine capable of installing a battery. Background Art

[0002] For example, a portable woodworking cutting machine called a rechargeable electric wood cutter is known as a plunge type, in which the tool body is supported on a base that abuts against the material to be cut in a manner that allows it to move in a direction close to or away from the material to be cut. For example, a plunge type portable woodworking cutting machine is disclosed in Patent Documents 1 and 2. Patent Document 1 discloses a plunge type portable woodworking cutting machine that can be equipped with two batteries as a power source. Patent Document 2 discloses a plunge type portable woodworking cutting machine that can install or remove a battery as a power source in the left-right direction. [Prior art literature] [Patent Document]

[0003] Patent Document 1: Japanese Patent Publication No. 2014-148017 Patent Document 2: Japanese Patent Publication No. 2018-79632 Summary of the invention [Technical problem to be solved by the invention]

[0004] When replacing batteries with different capacities (size, weight), for example, a large-capacity battery may protrude to the left or right and may interfere with the grip of the handle. In addition, the center of gravity may change due to the installation of a large-capacity battery, which may impair operability during operation. In the present application, good operability is ensured regardless of the size of the battery. [Technical solutions for solving technical problems]

[0005] According to one embodiment of the present application, a portable woodworking cutting machine has a supporting member and a main body, wherein the supporting members are located on the left and right sides and extend vertically in parallel with each other; the main body is supported by the supporting members at a position between the supporting members so as to be movable up and down, and the loading force of the compression spring arranged on the inner side of the supporting member is applied upward, and a cutting tool is installed. The portable woodworking cutting machine has a battery mounting portion, and a battery is detachably mounted on the battery mounting portion above the main body. The battery mounting portion holds a battery in a posture in which the length direction of the battery is at an angle of 70 to 90 degrees relative to an imaginary plane including the supporting member.

[0006] Therefore, the battery installed in the battery installation part is held in a compact area in the left-right direction. According to this, the portable woodworking cutting machine is made compact. The inclination of the holding posture of the battery relative to the imaginary plane also includes inclination in any direction such as up and down, left and right.

[0007] According to another embodiment of the present application, a portable woodworking cutting machine has a supporting member and a main body, wherein the supporting members are located on the left and right sides and extend vertically in parallel with each other; the main body is supported by the supporting members at a position between the supporting members so as to be movable up and down, and the loading force of the compression spring arranged on the inner side of the supporting member applies force upward, and a tool is installed. The portable woodworking cutting machine has a gripping portion and a battery mounting portion, wherein the gripping portion is arranged on the left and right sides of the main body; the battery mounting portion is detachably mounted with a battery above the main body. The battery mounting portion holds a battery in a posture in which the length direction of the battery is angled relative to an imaginary plane including the supporting member.

[0008] Therefore, the battery installed in the battery installation part is held in a compact area in the left-right direction. Accordingly, the battery is not likely to hinder the user holding the gripping part, thereby improving the operability of the portable woodworking cutting machine. The inclination of the holding posture of the battery relative to the imaginary plane also includes inclination in any direction such as up and down, left and right. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is an overall perspective view of the portable woodworking cutting machine according to the embodiment. This figure shows a state where a battery is installed. Figure 2 This is an overall perspective view of the portable woodworking cutting machine according to the embodiment. This figure shows a state where the battery is removed. Figure 3 yes Figure 1 III view in the figure. Figure 4 This is a longitudinal sectional view of the portable woodworking cutting machine according to the embodiment. This figure shows a state where the main body is located at the top dead center. Figure 5 This is a longitudinal sectional view of the portable woodworking cutting machine according to the embodiment. This figure shows a state where the main body is located at the maximum descending end position. Figure 6 In this figure, the bottom view of the battery cell is shown in a comparative manner, that is, the top is a bottom view of a small battery, and the bottom is a bottom view of a large battery. Figure 7 This is a front view of a portable woodworking cutter. This view shows a state where a small battery is installed. This view shows a state where the main body is at the top dead center. Figure 8 yes Figure 7 View in the VIII direction. Fig. 9 This is a front view of a portable woodworking cutter. This view shows a state where a large battery is installed. This view shows a state where the main body is at the top dead center. Fig.10 yes Fig. 9 X-axis view in . [Explanation of Reference Numerals] 1: Portable woodworking cutting machine; W: Cutting material; K: Imaginary plane; 2: Cutting tool; 3: Battery (small); 3a: Rail receiving part; 3b: Terminal receiving part (positive pole); 3c: Terminal receiving part (negative pole); 3d: Step part; 3e: Locking claw; 3f: Unlocking button; 4: Battery (large); 4a: Rail receiving part; 4b: Terminal receiving part (positive pole); 4c: Terminal receiving part (negative pole); 4d: Step part; 4e: Locking claw; 4f: Unlocking button; 10: Base; 10a: Working hole; 10b: Connecting cylinder ; 11: Support member (left side); 12: Support member (right side); 13: Top dead center adjustment mechanism; 20: Main body; 21: Battery installation part; 21a: Access port; 21b: Limiting part; 21c: Elastic body; 21d: Track; 21e: Locking recess; 22: Grip (left side); 23: Grip (right side); 23a: Standby switch; 23b: Start switch; 23c: Lock button; 24: Support housing; 24a: Left support housing; 24b: Right support housing; 25: Air inlet; 26: Shift dial; 27 : Terminal board; 27a: Connection terminal (positive pole); 27b: Connection terminal (negative pole); 28: Controller; G3: Center of gravity of the main body when a small battery is installed; G4: Center of gravity of the main body when a large battery is installed; 30: Main body shell; 31: Upper shell; 31a, 31b: Support cylinder; 32: Lower shell; 32a, 32b: Support cylinder; 32c: Support (left side); 32d: Support (right side); 32e: Limiting support; 32f: Exhaust port; 33, 34: Bearing; 35: Auxiliary housing; 36: Auxiliary component; 36a: External threaded portion; 36b: Locking nut (operating component); 36c: End cover; 36d: Auxiliary sleeve; 37: Compression spring; 38: Auxiliary component; 39: Compression spring; 40: Electric motor; 41: Motor shaft; J: Motor axis line; 42: Cooling fan; 43: Clamp; 44: Linear ball bearing; 50: Lower dead point limit portion; 51: Limit screw; 52: Knob portion; 53: Release button; 55: Limit portion receiving portion; 56, 57, 58: Abutment portion; 59: Support portion. DETAILED DESCRIPTION

[0010] In one or more embodiments, the battery mounting portion holds the battery in a posture where the longitudinal direction has an angle of 50 degrees or more with respect to the imaginary plane. Therefore, the battery is held in a more compact area in the left-right direction compared to a posture where the longitudinal direction is along the imaginary plane.

[0011] In one or more embodiments, the battery mounting portion holds the battery in a posture where the longitudinal direction has an angle of 70 degrees or more with respect to the imaginary plane. Therefore, compared with a posture where the longitudinal direction is along the imaginary plane, the battery is held in a more compact area in the left-right direction.

[0012] In one or more embodiments, the battery mounting portion holds the battery in a posture where the longitudinal direction has an angle of approximately 90 degrees with respect to the imaginary plane. Therefore, the battery is held in the most compact area in the left-right direction.

[0013] In one or more embodiments, the battery mounting portion has an access port and a stopper, wherein the access port is connected to the battery on the user side; and the stopper limits the movement of the battery from the access port in a direction away from the user. Therefore, the battery moves in a direction away from the user and is mounted on the battery mounting portion, and moves in a direction close to the user and is removed from the battery mounting portion. This ensures good mounting and dismounting properties of the battery.

[0014] In one or more embodiments, when multiple batteries of different sizes or weights are replaced and installed in the battery installation portion, the center of gravity of the portable woodworking cutter is maintained at a constant position in the left-right direction. Therefore, when multiple batteries are replaced and installed, stable operability is ensured when the portable woodworking cutter is moved and operated.

[0015] In one or more embodiments, when multiple batteries of different weights are replaced and installed in the battery installation part, the heavy battery is held in the battery installation part in such a manner that the center of gravity of the battery is displaced toward the user side. Therefore, in a normal cutting operation, the portable woodworking cutter is pressed in a direction away from the user to perform the cutting operation, so that the portable woodworking cutter is not easy to tip over toward the user side when a heavy battery is installed.

[0016] In one or more embodiments, when a battery is mounted on the battery mounting portion, the center of gravity of the main body including the battery is located on the imaginary plane, so that the main body can be smoothly raised and lowered.

[0017] In one or more embodiments, the main body has a motor and a controller, wherein the motor is used to rotate the tool; and the controller has a built-in control substrate including a control circuit for controlling the motion of the motor. The controller is arranged above the motor in a posture intersecting with the motor axis of the motor. Therefore, the controller is compactly arranged in the vertical direction.

[0018] In one or more embodiments, the portable woodworking cutting machine has an operating component of a top dead center adjustment mechanism that limits the upward movement range of the main body on the upper part of the support component. At the maximum descending end position of the downward movement range of the main body, the battery installed in the battery installation part is arranged in an area where the position in the vertical direction overlaps with the operating component. Therefore, the main body can be lowered to a height where the battery is located to the side of the operating component. According to this, the portable woodworking cutting machine will not be enlarged, and a deeper cutting depth of the tool relative to the cut material can be achieved.

[0019] In one or more embodiments, the main body has an air inlet for cooling the motor on the left and right sides opposite to the operating member. Therefore, external air is smoothly sucked into the air inlet without resistance from the operating member, thereby improving the cooling efficiency of the motor.

[0020] In one or more embodiments, the battery mounting portion has a housing having a left-right split structure that is connected to each other by abutting against each other, thereby facilitating the assembly of the battery mounting portion.

[0021] In one or more embodiments, the portable woodworking cutting machine has a base that contacts the material to be cut. The main body is configured to be inseparable from the base. Therefore, the above-mentioned devices are applicable only to a plunge-type portable woodworking cutting machine in which the main body can move up and down through left and right support parts. The portable woodworking cutting machine is a cutting machine dedicated to the plunge-type, and cannot be replaced by a fixed base that separates the main body from the base and does not have a support component for moving up and down. [Example]

[0022] like Figures 1 to 3 As shown, in the embodiment of the present application, a so-called plunge-type electric milling machine is exemplified as an example of a portable woodworking cutting machine 1. The portable woodworking cutting machine 1 includes: a base 10 that abuts against a workpiece W; and a main body 20 that is supported on the base 10 in a manner that can move up and down. The main body 20 is moved downward, and the tool 2 cuts into the workpiece W. By moving the portable woodworking cutting machine 1 toward the surface direction of the workpiece W while the main body 20 is moved downward, the tool 2 cuts into the surface direction of the workpiece W.

[0023] The center of the base 10 is in the shape of a ring having a circular working hole 10a. The tool 2 cuts into the cut material W on the inner circumference of the working hole 10a. A pair of left and right support members 11 and 12 are supported on the upper surface of the base 10. The support member 11 on the left and the support member 12 on the right have a sleeve shape. The support member 11 on the left and the support member 12 on the right are fixed to the left and right sides of the working hole 10a. The support member 11 on the left and the support member 12 on the right extend upward from the upper surface of the base 10 in parallel with each other. The main body 20 is supported by the support member 11 on the left and the support member 12 on the right so as to be movable up and down.

[0024] The upper part of the main body 20 has a battery mounting portion 21 capable of mounting one battery 3. Grips 22 and 23 are provided on the left and right sides of the main body 20. The user of the portable woodworking cutter 1 is located on the front surface side of the main body 20, and holds the left grip 22 with the left hand and the right grip 23 with the right hand to move and operate the portable woodworking cutter 1. The user moves the portable woodworking cutter 1 forward, backward, left and right to operate the portable woodworking cutter 1, and the tool 2 cuts into the cut material W to perform cutting processing.

[0025] like Figure 2 As shown, the battery mounting portion 21 has a support shell 24. The support shell 24 has a left-right split structure in which a left support shell 24a and a right support shell 24b are connected to each other. An access port 21a for receiving the battery 3 is provided at the front of the support shell 24. Limiting portions 21b for limiting the movement of the battery 3 to the rear (away from the user) are provided at two locations at the left and right ends of the access port 21a. Two elastic bodies 21c (rubber pins) for suppressing the shaking of the installed battery 3 are provided on the inner side of each of the left and right limiting portions 21b.

[0026] A pair of left and right rails 21d are provided on the support housing 24. The left and right rails 21d extend backward in parallel with each other from the left and right sides of the inlet 21a. A terminal plate 27 electrically connected to the battery 3 is provided between the left and right rails 21d. The terminal plate 27 is provided with a positive connection terminal 27a and a negative connection terminal 27b. The terminal plate 27 is sandwiched between the left support housing 24a and the right support housing 24b and assembled to the battery mounting portion 21.

[0027] like Figure 1As shown, the battery 3 has a substantially hexahedral shape (rectangular parallelepiped) with a length L3, a width S3, and a height H3. The battery 3 is mounted on the battery mounting portion 21 in a posture in which the length L3 direction (length direction L3) coincides with the front-back direction. The battery 3 is mounted on the battery mounting portion 21 by moving from the inlet 21a to the rear (in a direction away from the user) with its front side facing the user side (front). The battery 3 is removed from the battery mounting portion 21 by moving forward (in a direction close to the user).

[0028] like Figure 6 As shown, a pair of left and right rail receiving parts 3a are provided on the lower surface of the battery 3. By engaging the rail 21d with the left and right rail receiving parts 3a, the battery 3 is supported on the battery mounting part 21 in a manner that it can slide relative to the battery mounting part 21 in the front-rear direction (disassembly direction, installation direction).

[0029] A positive terminal receiving portion 3b and a negative terminal receiving portion 3c are provided between the left and right rail receiving portions 3a. When the battery 3 is mounted on the battery mounting portion 21, the positive connection terminal 27a is connected to the positive terminal receiving portion 3b, and the negative connection terminal 27b is connected to the negative terminal receiving portion 3c. Thus, the battery 3 is electrically connected to the battery mounting portion 21.

[0030] A step portion 3d protruding downward in a mountain shape is provided on the front side of the battery 3. A locking claw 3e is provided behind the step portion 3d. The locking claw 3e is urged in a downward protruding direction (locking side) by a spring. An unlocking button 3f is provided on the front surface of the step portion 3d. The unlocking button 3f is linked to the locking claw 3e. When the user pushes the unlocking button 3f upward with a fingertip, the locking claw 3e overcomes the spring force and retreats upward.

[0031] The limiting portion 21b of the battery mounting portion 21 is provided with a locking recess 21e. When the battery 3 is mounted on the battery mounting portion 21, the rear portions of the left and right ends of the step portion 3d abut against the limiting portions 21b at the left and right locations, respectively. This restricts the movement of the battery 3 in the rear direction (mounting direction). When the battery 3 is mounted on the battery mounting portion 21, the locking claw 3e fits into the locking recess 21e. This restricts the movement of the battery 3 in the front direction (removal direction).

[0032] Elastic bodies 21c are disposed on both left and right sides of the locking recess 21e. When the battery 3 is mounted on the battery mounting portion 21, the elastic body 21c abuts against the step portion 3d, thereby preventing the battery 3 from shaking.

[0033] like Figure 3 , Figure 7 , Figure 8As shown, the battery 3 is held by the battery mounting portion 21 in a posture in which the longitudinal direction L3 in a plan view is at an angle of 90 degrees to the imaginary plane K including the left support member 11 and the right support member 12, and the longitudinal direction L3 in a side view is at an angle of approximately 90 degrees to the imaginary plane K including the left support member 11 and the right support member 12. Accordingly, the battery 3 is held in an area that does not protrude between the left support member 11 and the right support member 12 and is the most compact area in the left-right direction.

[0034] In the battery mounting portion 21, a large battery 4 (large battery 4) with a relatively large capacity can be mounted instead of a small battery 3 (small battery 3) with a relatively small capacity. The large battery 4 is larger in size by accommodating more cells than the small battery 3. Therefore, the large battery 4 is heavier than the small battery 3. Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 This shows a state where the small battery 3 is mounted. Fig. 9 , Fig.10 This shows a state where the large battery 4 is mounted.

[0035] like Figure 6 As shown, the length L4 of the large battery 4 is longer than the length L3 of the small battery 3 (L3<L4). The height H4 of the large battery 4 is higher than the height H3 of the small battery 3 (H3<H4). The width S3 of the small battery 3 and the width S4 of the large battery 4 are the same.

[0036] The small battery 3 and the large battery 4 are interchangeable and can be mounted on the common battery mounting portion 21. Figure 6 The positional relationship between the left and right rail receiving parts 3a, the positive terminal receiving part 3b and the negative terminal receiving part 3c shown in the upper part of the small battery 3 and the locking claw 3e, and Figure 6 The left and right rail receiving parts 4a, the positive terminal receiving part 4b and the negative terminal receiving part 4c shown in the lower part have the same positional relationship with respect to the locking claw 4e of the large battery 4.

[0037] When the large battery 4 is mounted on the battery mounting portion 21 , the positive connection terminal 27 a is connected to the positive terminal receiving portion 4 b , and the negative connection terminal 27 b is connected to the negative terminal receiving portion 4 c .

[0038] A step portion 4d protruding downward in a mountain shape is provided on the front side of the large battery 4. The step portion 4d is provided at a position farther forward than the small battery 3 relative to the locking claw 4e. The locking claw 4e is urged by a spring in a direction protruding downward (locking side). An unlocking button 4f is provided on the front surface of the step portion 4d. The unlocking button 4f is linked to the locking claw 4e. When the user pushes the unlocking button 4f upward with a fingertip, the locking claw 4e overcomes the spring force and retreats upward.

[0039] A locking recess 21e is provided between the left and right limiting portions 21b of the battery mounting portion 21. When the large battery 4 is mounted on the battery mounting portion 21, the left and right rear portions of the step portion 4d abut against the left and right limiting portions 21b, respectively. Accordingly, the large battery 4 is restricted from moving backward (in the installation direction). When the large battery 4 is mounted on the battery mounting portion 21, the locking claw 4e is embedded in the locking recess 21e. Accordingly, the large battery 4 is restricted from moving forward (in the removal direction). When the large battery 4 is mounted on the battery mounting portion 21, the elastic body 21c abuts against the step portion 4d. Accordingly, the large battery 4 is restrained from shaking in the installed state.

[0040] like Figure 6 As shown, the length L0 from the rear end of the small battery 3 to the locking claw 3e is the same as the length L0 from the rear end of the large battery 4 to the locking claw 4e. The length L2 from the front end of the large battery 4 to the locking claw 4e is greater than the length L1 from the front end of the small battery 3 to the locking claw 3e. Therefore, in the large battery 4, the length from the locking claw 4e to the front end is longer than that of the small battery 3 (L2-L1). The difference in length (L2-L1) is equivalent to the difference (L4-L3) between the length L4 of the large battery 4 and the length L3 of the small battery 3.

[0041] The step portion 4d of the large battery 4 is longer in the length direction than the step portion 3d of the small battery 3 by the difference in length (L2-L1). Fig.10 As shown in FIG. 1 , when the large battery 4 is mounted on the battery mounting portion 21, the large battery 4 is held in a posture extending toward the user by the difference in length (L2-L1). Figure 8 As shown, the front-to-back position of the center of gravity G4 of the main body 20 with the large battery 4 mounted thereon is displaced, for example, by about 7 mm forward (toward the user's side) relative to the front-to-back position of the center of gravity G3 of the main body 20 with the small battery 3 mounted thereon.

[0042] During cutting operation, the user applies a force F to press the main body 20 backward to perform the moving operation. Therefore, when the large battery 4 is installed in the battery installation part 21, the position of the center of gravity G4 is displaced toward the user side (front) compared to the case where the small battery 3 is installed, and accordingly, the portable woodworking cutting machine 1 is not easy to fall backward (in the direction of pressing) during the moving operation.

[0043] like Figure 8 , Fig.10 As shown, when the small battery 3 is installed and when the large battery 4 is installed, the positions of the centers of gravity G3 and G4 in the front-back direction are both within the range of the diameter (thickness) of the support members 11 and 12. Accordingly, when the small battery 3 is installed and when the large battery 4 is installed, the main body 20 can be smoothly raised and lowered.

[0044] The width S3 of the small battery 3 and the width S4 of the large battery 4 are equal (S3 = S4). Figure 7 The position of the center of gravity G3 of the main body 20 with the small battery 3 mounted thereon in the left-right direction is similar to that shown in FIG. Fig. 9 As shown in the figure, the position of the center of gravity G4 in the left-right direction of the main body 20 with the large battery 4 installed is roughly the same. Therefore, the center of gravity G3 and the center of gravity G4 are both located in the approximate center of the left-right direction of the main body 20. Since the position of the center of gravity G3 and G4 in the left-right direction of the main body 20 hardly changes when replacing and installing batteries 3 and 4 of different sizes, the left-right weight balance of the main body 20 is maintained. Based on this, good operability of the lifting and lowering action of the main body 20 is ensured. In addition, since the position of the center of gravity G3 and G4 in the left-right direction hardly changes, the operability of the moving operation during cutting processing does not change significantly, and good operability is ensured in this respect.

[0045] The height H4 of the large battery 4 is higher than the height H3 of the small battery 3 (H3<H4). Fig. 9 As shown in the figure, the height position of the center of gravity G4 of the main body 20 with the large battery 4 mounted thereon is as follows: Figure 7 As shown, the height position of the center of gravity G3 of the main body 20 to which the small battery 3 is mounted is, for example, about 35 mm high.

[0046] The main body 20 has a main body case 30. The main body case 30 has an upper case 31 made of resin and a lower case 32 made of metal. The lower case 32 is combined with the lower side of the upper case 31. The support case 24 of the battery mounting part 21 is combined with the upper part of the upper case 31. The upper part of the upper case 31 is clamped by the left support case 24a and the right support case 24b on the left and right sides, and the support case 24 is combined with the upper part of the upper case 31. The support case 24 is a left-right split structure, which facilitates the assembly work of the battery mounting part 21 to the main body case 30.

[0047] The upper housing 31 houses the electric motor 40. The motor shaft 41 of the electric motor 40 is rotatably supported by a bearing 33 provided in the upper housing 31 and a bearing 34 provided in the lower housing 32. A cooling fan 42 is mounted on the motor shaft 41 below the electric motor 40.

[0048] An air inlet 25 is provided on the right side of the support housing 24 of the battery mounting portion 21. The cooling fan 42 is rotated by starting the motor 40, and external air is introduced into the support housing 24 and the main housing 30 from the air inlet 25. The introduced external air flows downward. The motor 40 is cooled accordingly. The cooling fan 42 is accommodated in the lower housing 32. The introduced external air is discharged from the exhaust port 32f (see FIG. 1 ) provided on the lower surface of the lower housing 32. Figure 7 , Fig. 9 )exhaust.

[0049] A rectangular flat-plate-shaped controller 28 is installed in the support housing 24. The controller 28 mainly includes a control substrate, and the control substrate includes a control circuit for controlling the operation of the motor 40. The controller 28 is cooled by introducing external air into the support housing 24 from the air inlet 25. The controller 28 is arranged above the motor 40. The controller 28 is arranged in a posture in which the surface direction of the controller 28 is substantially orthogonal to the motor axis J. Accordingly, the controller 28 is compactly accommodated in the up-down direction.

[0050] The lower portion of the motor shaft 41 protrudes downward from the lower housing 32. A clamp 43 is provided at the lower portion of the motor shaft 41. The rod-shaped cutter 2 is coaxially mounted at the lower portion of the motor shaft 41 via the clamp 43.

[0051] The upper shell 31 is provided with vertically long support cylinders 31a and 31b on the left and right sides. The lower shell 32 is provided with vertically long support cylinders 32a and 32b on the left and right sides. The support cylinders 31a and 32a on the left are coaxially arranged with each other. The support cylinders 31b and 32b on the right are coaxially arranged with each other. The support cylinders 31b and 32b on the right are also covered by the auxiliary shell 35.

[0052] The lower parts of the left supporting member 11 and the right supporting member 12 are respectively inserted into the coupling cylinder 10b provided on the upper surface of the base 10 in a manner that cannot be separated. Figure 4 As shown in the figure, when the main body 20 is at the top dead center, the upper sides of the left support member 11 and the right support member 12 enter the lower support cylinder 32a and 32b respectively. When the main body 20 is moved downward, the left support member 11 and the right support member 12 enter the upper support cylinder 31a and 31b respectively.

[0053] like Figure 5As shown, the main body 20 is supported so as to be able to move downward to the maximum descent end position where the lower part of the support cylinder 32a, 32b on the lower side is docked with the coupling cylinder 10b on the side of the base 10. When the main body 20 is located at the maximum descent end position, the upper part of the support member 11 on the left side and the upper part of the support member 12 on the right side are respectively in a state close to the upper part of the support cylinder 31a, 31b on the upper side. In the normal use state, the main body 20 moves up and down at a position above the maximum descent end position by the lower dead point limiter 50 described later. The lower dead point of the main body 20 is determined by the lower dead point limiter 50.

[0054] A top dead point adjustment mechanism 13 for adjusting the top dead point of the main body 20 is provided at the upper portion of the left support member 11. The top dead point adjustment mechanism 13 has a rod-shaped auxiliary member 36 that is long in the upper and lower directions. An auxiliary member 36 is arranged on the inner circumference of the upper and lower support cylinders 31a and 32a. The lower end of the auxiliary member 36 is coupled to the base 10. The upper portion of the auxiliary member 36 protrudes upward from the support cylinder 31a. An external threaded portion 36a is provided at the protruding portion. A locking nut 36b is screwed onto the external threaded portion 36a as an operating member. The external threaded portion 36a is made of steel, and the locking nut 36b is made of synthetic resin.

[0055] The upper surface of the left support cylinder 31a abuts the locking nut 36b to position the top dead center of the main body 20. The top dead center of the main body 20 can be adjusted up and down by changing the screwing position of the locking nut 36b relative to the external threaded portion 36a. An end cap 36c is provided above the locking nut 36b. The end cap 36c is integrated with the auxiliary component 36 by being pressed in, and does not fall off even when the locking nut 36b loosens and moves upward. The thread root of the locking nut 36b is shallower than the usual thread. This shallower portion is screwed into the top of the thread of the external threaded portion 36a when screwed with the external threaded portion 36a, and elastically holds the locking nut 36b. This elastic holding action prevents the locking nut 36b from loosening.

[0056] An auxiliary sleeve 36d is coupled to the upper portion of the support cylinder 31a. The auxiliary sleeve 36d extends downward. The auxiliary sleeve 36d extends from the upper support cylinder 31a to the lower support cylinder 32a. The auxiliary component 36 is inserted into the inner circumference of the auxiliary sleeve 36d in a manner that allows relative displacement up and down.

[0057] A compression spring 37 is disposed on the outer circumference of the auxiliary member 36 and the auxiliary sleeve 36d. The lower portion of the compression spring 37 abuts against the upper surface of the base 10 (the upper surface of the coupling cylinder 10b) via the inner circumference of the support member 11. The upper portion of the compression spring 37 abuts against the upper portion of the support cylinder 31a.

[0058] A cylindrical linear ball bearing 44 is mounted on the inner circumference of the right and lower support cylinder portion 32b. The right support member 12 is inserted through the inner circumference of the linear ball bearing 44. The right support member 12 is supported by the main body housing 30 via the linear ball bearing 44 so as to be movable up and down relative to the main body housing 30.

[0059] An auxiliary component 38 is coupled to the upper portion of the support cylinder 31b on the right and upper side. The auxiliary component 38 extends downward from the upper portion of the support cylinder 31b. The lower portion of the auxiliary component 38 enters the inner circumference of the support component 12. A compression spring 39 is arranged along the inner circumference of the support component 12 and the outer circumference of the auxiliary component 38. The lower portion of the compression spring 39 abuts against the upper surface of the base 10 (the bottom surface of the coupling cylinder 10b). The upper portion of the compression spring 39 abuts against the upper surface of the support cylinder 31b.

[0060] The main body 20 is urged in the upward movement direction by the left and right compression springs 37 and 39. The main body 20 overcomes the urging force of the compression springs 37 and 39 and is moved downward.

[0061] The support cylinder 32a on the left and lower side is integrally provided with a seat portion 32c. The seat portion 32c is provided in a manner protruding to the left side. The seat portion 32c further protrudes to the left side from the left side of the upper shell 31. The grip portion 22 is mounted on the left side of the main body 20 through the seat portion 32c. The grip portion 22 on the left side has a handle shape that is easy for the user to grip with the left hand.

[0062] The support cylinder 32b on the right and lower side is integrally provided with a seat portion 32d. The seat portion 32d is provided in a manner protruding to the right side. The seat portion 32d further protrudes to the right side from the right side of the auxiliary housing 35. The grip portion 23 is mounted on the right side of the main body 20 through the seat portion 32d. The grip portion 23 on the right side has a handle shape that is easy for the user to grip with the right hand.

[0063] A standby switch 23a is provided at the upper part of the right grip 23. When the standby switch 23a is pressed, the battery 3 enters a power supply state (start-up standby state). When the standby switch 23a is pressed in the start-up standby state, the power is disconnected. Figure 8 As shown, a trigger-type start switch 23b is provided on the rear surface of the right grip 23. When the start switch 23b is pressed in the start standby state, the motor 40 is started. Accordingly, the tool 2 rotates. When the start switch 23b is released from the pressing operation, the motor 40 stops and enters the start standby state.

[0064] A lock button 23c for maintaining the start switch 23b in the pulled state is disposed on the left side of the right grip 23. When the lock button 23c is pressed while the start switch 23b is pulled, the pull state of the start switch 23b is locked. This facilitates cutting operations such as long groove cutting. When the start switch 23b is pulled hard in the locked state, the locked state is released. This allows the start switch 23b to be released.

[0065] A speed change dial 26 is provided on the right side of the front surface of the main body 20. By rotating the speed change dial 26, the speed of the motor 40 is changed. Thus, the rotation speed of the cutter 2 can be adjusted.

[0066] A limit portion support portion 32e is provided on the left side of the lower housing 32. A lower stop point limit portion 50 for positioning the lower stop point of the main body 20 is provided on the limit portion support portion 32e. The lower stop point limit portion 50 has a limit screw 51. A knob portion 52 for holding during rotation operation is provided on the upper portion of the limit screw 51. The limit screw 51 passes through the limit portion support portion 32e from top to bottom.

[0067] The split nut (not shown in the figure) is embedded in the limit portion support portion 32e. The split nut has an internal threaded portion that can engage with the limit screw 51 within a range of approximately half a circle on the rear side of the inner peripheral hole. The split nut is embedded in a manner that can change its position in the radial direction (front-to-back direction) of the limit screw 51. The split nut is urged forward (the side that engages with the limit screw 51) by a spring. The engagement between the split nut and the limit screw 51 is released by pressing the release button 53 provided on the front surface of the limit portion support portion 32e backward. Accordingly, the position of the limit screw 51 in the up and down directions can be quickly changed.

[0068] When the release button 53 is released from being pressed, the half nut meshes with the stop screw 51. When the stop screw 51 is rotated while the knob 52 is gripped in this meshed state, the upper position of the stop screw 51 can be finely adjusted.

[0069] A limit portion receiving portion 55 is provided below the limit screw 51 and on the upper surface of the base 10. The limit portion receiving portion 55 has three contact portions 56, 57, 58 of different heights. The three contact portions 56, 57, 58 are supported on the upper surface of a circular support portion 59. The three contact portions 56, 57, 58 are arranged at three equal parts of the periphery of the support portion 59. The three contact portions 56, 57, 58 can be finely adjusted in height independently.

[0070] The support portion 59 can be rotated to position any one of the three contact portions 56, 57, and 58 below the stop screw 51. The stop screw 51 is brought into contact with the contact portion 56 (or 57, 58) to position the bottom dead point of the main body 20. The bottom dead point of the main body 20 is appropriately adjusted according to the size of the tool 2 and the cutting depth.

[0071] According to the embodiment described above, the battery mounting portion 216 is held in a posture such that the length directions L3 and L4 of the batteries 3 and 4 are perpendicular to the imaginary plane K including the left support member 11 and the right support member 12. Therefore, the batteries 3 and 4 mounted on the battery mounting portion 21 are held in a compact area in the left-right direction. Thus, the portable woodworking cutting machine 1 is made compact.

[0072] According to the embodiment, the batteries 3 and 4 mounted on the battery mounting portion 21 are held in a compact area in the left-right direction, so that the batteries 3 and 4 are less likely to hinder the user holding the grips 22 and 23. Thus, the operability of the portable woodworking cutting machine 1 is further improved.

[0073] According to the embodiment, the battery mounting portion 21 has an access port 21a for accessing the batteries 3 and 4 on the user side, and a stopper 21b for limiting the movement of the batteries 3 and 4 from the access port 21a in a direction away from the user (backward). Therefore, the batteries 3 and 4 are mounted on the battery mounting portion by moving backward away from the user, and are removed from the battery mounting portion 21 by moving forward toward the user. Thus, good mounting and dismounting properties of the batteries 3 and 4 are ensured.

[0074] According to the embodiment, when two batteries 3 and 4 of different sizes or weights are replaced and installed in the battery installation part 21, the center of gravity G3 and G4 of the main body 20 of the portable woodworking cutting machine 1 does not change significantly in the left-right direction, and is maintained at a substantially constant position in the left-right direction. Therefore, when the two batteries 3 and 4 are replaced and installed, stable operability can be ensured when the portable woodworking cutting machine 1 is moved and operated.

[0075] According to the embodiment, when two batteries 3 and 4 of different weights are replaced and installed in the battery installation part 21, the heavy large battery 4 is held in the battery installation part 21 in such a manner that the center of gravity of the large battery 4 is displaced toward the user side relative to the center of gravity of the light small battery 3. Therefore, in a normal cutting operation, since the portable woodworking cutter 1 is pressed away from the user to perform the cutting operation, it is difficult for the portable woodworking cutter 1 to tip toward the user side when the heavy large battery 4 is installed.

[0076] According to an embodiment, Figure 8When a small battery 3 is installed as shown, the center of gravity G3 of the main body 20 in the front-rear direction is located within the diameter (within the range of thickness) of the support members 11 and 12. Fig.10 When a large battery 4 is mounted as shown, the position of the center of gravity G4 of the main body 20 in the front-to-back direction is also located within the diameter (within the range of thickness) of the support members 11 and 12. Therefore, when the batteries 3 and 4 are mounted on the battery mounting portion 21, the positions of the center of gravity G3 and G4 of the main body 20 including the batteries 3 and 4 in the front-to-back direction are located on the virtual plane K including the support members 11 and 12. Therefore, the lifting and lowering action of the main body 20 can be performed smoothly.

[0077] According to the embodiment, the main body 20 includes: a motor 40 that rotates the cutter 2; and a controller 28 that has a built-in control substrate including a control circuit that controls the operation of the motor 40. The controller 28 is arranged above the motor 40 in a posture that intersects with the motor axis J of the motor 40. Therefore, the controller 28 is compactly arranged in the vertical direction.

[0078] According to the embodiment, the portable woodworking cutting machine 1 has a top dead center adjustment mechanism 13 that limits the upward movement range (top dead center) of the main body 20. A locking nut 36b serving as an operating member of the top dead center adjustment mechanism 13 is provided above the support member 11. At the maximum descending end position of the downward movement range of the main body 20, the batteries 3 and 4 mounted on the battery mounting portion 21 are arranged in an area overlapping with the locking nut 36b in the vertical direction. Therefore, the main body 20 can be lowered to a height at which the batteries 3 and 4 are located to the side of the locking nut 36b. Accordingly, the portable woodworking cutting machine 1 will not be enlarged, and a deeper cutting depth of the tool 2 relative to the material W to be cut can be achieved.

[0079] According to the embodiment, the main body 20 has an air inlet 25 for cooling the motor on the left and right opposite sides of the lock nut 36b as the operating member. Therefore, the outside air is smoothly sucked into the air inlet 25 without being resisted by the lock nut 36b. Accordingly, the cooling efficiency of the motor 40 is improved.

[0080] According to the embodiment, the battery mounting portion 21 has a holder housing 24 of a left-right split structure that is connected to each other by abutting against each other. Therefore, the assembly operation of the battery mounting portion 21 is facilitated.

[0081] According to the embodiment, the portable woodworking cutting machine 1 has a base 10 that contacts the cut material W. The main body 20 is provided on the base 10 in a manner that cannot be separated from the base 10. Therefore, the battery mounting portion 21 of the example is applicable only to the plunge-type portable woodworking cutting machine 1 in which the main body 20 can move up and down through the left support member 11 and the right support member 12. Therefore, the portable woodworking cutting machine 1 is intended for a plunge-type dedicated cutting machine that cannot be replaced with a fixed base that, for example, separates the main body from the base and does not have a support member for moving up and down.

[0082] Various changes can be made to the embodiments. For example, the holding posture (installation posture) of the batteries 3 and 4 is shown as a structure in which the length directions L3 and L4 are approximately orthogonal to the imaginary plane K when viewed from above, but it can also be changed to a posture in which the length direction intersects the imaginary plane K within a range of about 50 to 90 degrees. In this case, the inclination of the length direction L relative to the imaginary plane K also includes an inclination in any direction such as up and down, left and right. By maintaining a posture at an angle relative to the imaginary plane K, the displacement of the center of gravity of the main body in the left and right direction when replacing and installing batteries of different sizes can be suppressed. Accordingly, good operability is ensured for the lifting and lowering action of the main body and the moving action of the portable cutting machine for woodworking.

[0083] Furthermore, since the battery is held at a certain angle relative to the imaginary plane K, the battery is compactly held within a range where it does not protrude from between the left support member 11 and the right support member 12 when viewed from above, and thus does not hinder the user when holding the grips 22 and 23 .

[0084] The example shows a structure applicable to two batteries 3 and 4 with the same width S3 and S4, but the example holding posture (such that the length direction intersects with the imaginary plane K within the range of approximately 50 to 90 degrees) can also be applied to multiple batteries with different widths within a range that does not protrude laterally from the left support part 11 and the right support part 12.

[0085] In the illustrated embodiment, the linear ball bearing 44 is used for the right support member 12, but the linear ball bearing 44 can also be used for the left support member 11. A sliding bearing may be used instead of the linear ball bearing.

[0086] In the embodiment, an electric milling machine with left and right grips 22 and 23 is exemplified as a portable woodworking cutting machine 1, but the battery holding posture exemplified can also be applied to a trimmer that is usually moved by one hand and is mainly used for relatively easy cutting operations such as edge processing of wood.

[0087] The portable woodworking cutting machine 1 is exemplified as one in which one battery 3 (or battery 4) is mounted on the upper portion of the main body 20, but it may also be a portable woodworking cutting machine capable of mounting two batteries, for example. In this case, one battery may be held on the upper portion of the main body in the exemplified posture, and the other battery may be held on the base, for example.

Claims

1. A portable woodworking cutting machine, characterized in that: It has a supporting member, a main body and a battery mounting portion, wherein: The support components are located on the left and right sides and extend vertically and parallelly to each other; The main body is supported by the support members in a manner that allows it to move up and down at a position between the support members, and is urged upward by a biasing force of a compression spring disposed inside the support members, and a cutter is mounted thereon; The battery mounting portion is provided with a battery detachably mounted on the main body. The battery mounting portion holds the one battery in a posture in which the longitudinal direction of the battery forms an angle of 70 to 90 degrees with respect to a virtual plane including the support member.

2. A portable woodworking cutting machine, characterized in that: It has a supporting member, a main body, a gripping portion and a battery mounting portion, wherein: The support components are located on the left and right sides and extend vertically and parallelly to each other; The main body is supported by the support members in a manner that allows it to move up and down at a position between the support members, and is urged upward by a biasing force of a compression spring disposed inside the support members, and a cutter is mounted thereon; The holding portion is arranged on the left and right sides of the main body; The battery mounting portion is provided with a battery detachably mounted on the main body. The battery mounting portion holds the one battery in a posture in which a longitudinal direction of the battery is angled with respect to a virtual plane including the support member.

3. The portable woodworking cutting machine according to claim 2, characterized in that: The battery mounting portion holds the battery in a posture in which the longitudinal direction has an angle of 50 degrees or more with respect to the virtual plane.

4. The portable woodworking cutting machine according to claim 2, characterized in that: The battery mounting portion holds the battery in a posture in which the longitudinal direction has an angle of 70 degrees or more with respect to the virtual plane.

5. The portable woodworking cutting machine according to claim 2, characterized in that: The battery mounting portion holds the battery in a posture in which the longitudinal direction has an angle of approximately 90 degrees with respect to the imaginary plane.

6. The portable woodworking cutting machine according to any one of claims 1 to 5, characterized in that: The battery installation portion includes an access port and a limiting portion, wherein the access port is for receiving the battery on the user side; and the limiting portion limits movement of the battery from the access port in a direction away from the user.

7. The portable woodworking cutting machine according to any one of claims 1 to 6, characterized in that: When a plurality of batteries of different sizes or weights are replaced and installed in the battery installation portion, the center of gravity of the portable woodworking cutting machine is maintained at a constant position in the left-right direction.

8. The portable woodworking cutting machine according to any one of claims 1 to 7, characterized in that: When a plurality of types of batteries having different weights are replaced and mounted on the battery mounting portion, the heavy battery is held in the battery mounting portion in a manner such that the center of gravity of the battery is displaced toward the user.

9. The portable woodworking cutting machine according to any one of claims 1 to 7, characterized in that: When the battery is mounted on the battery mounting portion, the center of gravity of the main body portion including the battery is located on the imaginary plane.

10. The portable woodworking cutting machine according to any one of claims 1 to 9, characterized in that: The main body has a motor and a controller, wherein the motor is used to rotate the tool; and the controller has a built-in control substrate including a control circuit for controlling the movement of the motor. The controller is arranged above the electric motor in a posture intersecting with a motor axis of the electric motor.

11. The portable woodworking cutting machine according to any one of claims 1 to 10, characterized in that: An operating member of a top dead point adjustment mechanism for limiting the upward movement range of the main body is provided on the upper portion of the support member. At the maximum descending end position of the downward movement range of the main body, the battery mounted on the battery mounting portion is arranged in a region where the vertical position overlaps with the operating member.

12. The portable woodworking cutting machine according to claim 11, characterized in that: The main body has air intakes for cooling the electric motor on opposite left and right sides of the operating member.

13. The portable woodworking cutting machine according to any one of claims 1 to 12, characterized in that: The battery mounting portion includes a housing having a left-right split structure that is butted against each other and combined.

14. The portable woodworking cutting machine according to any one of claims 1 to 13, characterized in that: It has a base that contacts the material being cut. The main body is configured to be unable to be separated from the base.

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