power tools

Abstract

To improve operability at the time of working.SOLUTION: A power tool includes: a motor 34; a housing 22 for accommodating the motor 34; an output shaft 34A driven by the motor 34; a control unit 90 for controlling the motor to operate; a trigger 42 for bringing the motor 34 into a drive state and a non-drive state; and a tact switch 56 capable of changing a control state of the control unit for the motor 34 with the operation by an operator. The control unit 90 varies the control state to change depending on when the tact switch 56 is operated while the motor 34 is in the non-drive state and when the tact switch 56 is operated while the motor 34 is in the drive state.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to power tools. [Background technology]

[0002] An electric router (power tool) such as that shown in Patent Document 1 below is known. This type of small electric router (power tool) is also called a trimmer, and the motor is turned on and off by a switch located on the top of the tool body. A base is held in the motor housing so that the height can be adjusted in the axial direction of the motor. Such a small electric router can be operated with one hand, and the operator holds the cylindrical part of the main body to which the base is attached with one hand. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-217203 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-101646 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned electric router leaves room for improvement in the following respects. Specifically, because the electric router has a switch on the top of the main body, if an unexpected incident occurs while working with one hand, the operator may not be able to quickly turn off the switch. Furthermore, Patent Document 2 provides multiple switches for changing the motor control state, each of which changes a different control state. If such a control-changing switch were applied to the electric router of Patent Document 1, the support state for the main body may change due to the operation of multiple switches, potentially resulting in instability.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a power tool that can improve operability during work. [Means for solving the problem]

[0009] One or more embodiments of the present invention include a motor, a housing for accommodating the motor, an output shaft driven by the motor, Electrically connected to the motor, the power supplied to the motor is controlled a control unit for controlling the operation of the motor; movable between an initial position and an operating position; an operating unit operable by an operator to drive the motor when operated and to deactivate the motor when the operation is released; The control unit is capable of detecting that the operation has been performed. a lock button, and the control unit The control device has as its control states an off-lock release state in which the motor is in the driving state when the operation unit is operated to the operating position, an off-lock state in which the motor is controlled to the non-driving state without being in the driving state even when the operation unit is operated to the operating position, and an on-lock state in which the motor is in the driving state even when the operation unit is located at the initial position, and when the lock button is operated in the off-lock state and the operation unit is located at the initial position, the control state transitions to the off-lock release state, and when the lock button is operated in the off-lock release state and the operation unit is located at the operating position, the control state transitions to the on-lock state. Power tools are recommended.

[0013] In one or more embodiments of the present invention, the control unit The aforementioned There is proposed a power tool that, when in an on-lock state, releases the on-lock state based on an operation on the operating portion. One or more embodiments of the present invention propose a power tool in which the control unit, when in the on-lock state, releases the on-lock state based on an operation on the lock button. One or more embodiments of the present invention propose a power tool in which the control unit transitions to the off-lock release state when the on-lock state is released.

[0014] In one or more embodiments of the present invention, the housing may include a gripper that can be held by the operator. grasping The operation unit is formed with the grasping and the Lock button The worker grasping The present invention proposes a power tool in which the operating part is arranged at a position different from the position at which the operating part is arranged, so that the operating part can be operated while being gripped.

[0015] One or more embodiments of the present invention comprise: The present invention proposes a power tool in which the lock button is provided on the opposite side of the operating part with respect to the grip part. In one or more embodiments of the present invention, the operating part is provided on the upper side of the grip part, and the lock button is located above the operating part. Power tools are recommended. One or more embodiments of the present invention propose a power tool in which the housing is formed by combining a first housing and a second housing, and the operating unit and the lock button are provided at a joint between the first housing and the second housing. One or more embodiments of the present invention propose a power tool further including a switch that outputs a detection signal to a control unit each time the lock button is operated. One or more embodiments of the present invention propose a power tool in which the control unit transitions from the off-lock release state to the off-lock state by operating the lock button. One or more embodiments of the present invention propose a power tool in which the control unit transitions from the off-lock release state to the off-lock state if no operation of the operating unit or the lock button is detected within a predetermined time. One or more embodiments of the present invention propose a power tool in which the control unit maintains the off-lock release state even if the operating unit is operated or released after transitioning from the off-lock release state. One or more embodiments of the present invention propose a power tool in which a battery that supplies power to the motor is detachable, and the control unit is placed in the off-lock state when the battery is attached. [Effects of the Invention]

[0018] According to the power tool having the above configuration, operability can be improved. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view of an electric trimmer according to an embodiment of the present invention; [Figure 2] 2 is an exploded perspective view showing the electric trimmer shown in FIG. 1 with a battery and a base removed from the trimmer body. FIG. [Figure 3] 2 is a side view of the electric trimmer shown in FIG. 1 as viewed from one side in a first direction. [Figure 4] 2 is a side view of the electric trimmer shown in FIG. 1 as viewed from the other side in the first direction. [Figure 5] 2 is a side view of the electric trimmer shown in FIG. 1 as viewed from one side in a second direction. [Figure 6] 6 is a side cross-sectional view (cross-sectional view taken along line 6-6 in FIG. 3) of the electric trimmer shown in FIG. 3 as seen from one side in the second direction. [Figure 7] 7 is a side cross-sectional view (cross-sectional view taken along line 7-7 in FIG. 5) of the electric trimmer shown in FIG. 5 as seen from one side in a first direction. [Figure 8] 3 is an exploded perspective view showing a trimmer body with an outer housing shown in FIG. 2 removed from an inner housing. FIG. [Figure 9] 7 is a functional block diagram for explaining the electrical configuration of a control unit shown in FIG. 6. FIG. [Figure 10] 5 is a flowchart illustrating the operation of the electric trimmer according to the present embodiment. [Figure 11] 1. FIG. 4 is a side view showing a modified example of the lifting mechanism shown in FIG. 1, viewed from one side in the first direction. [Figure 12] FIG. 10 is a perspective view showing a modified circular saw. [Figure 13] FIG. 13 shows a control panel provided on the circular saw shown in FIG. 12. DETAILED DESCRIPTION OF THE INVENTION

[0020] An electric trimmer 10 as a power tool according to this embodiment will be described below with reference to the drawings. As shown in Fig. 1, the electric trimmer 10 is formed in a generally cylindrical shape as a whole. In the following description, one axial side of the electric trimmer 10 (the side indicated by arrow A in Fig. 1) will be referred to as the lower side of the electric trimmer 10, and the other axial side of the electric trimmer 10 (the side indicated by arrow B in Fig. 1) will be referred to as the upper side of the electric trimmer 10. In addition, in a plan view seen from above, a direction perpendicular to the up-down direction will be referred to as a first direction (see arrows C and D in Fig. 1), and a direction perpendicular to the first direction will be referred to as a second direction (see arrows E and F in Fig. 1).

[0021] The electric trimmer 10 is configured as a tool that performs cutting on a workpiece placed below the electric trimmer 10. As also shown in Fig. 2, the electric trimmer 10 includes a trimmer body 20 (a component that can be broadly understood as a main body), a base 60, a battery 58 (a component that can be broadly understood as a storage battery), a lifting mechanism 70, and a control unit 90 (see Figs. 6 and 7). Each component of the electric trimmer 10 will be described below.

[0022] (Regarding the trimmer body 20) As shown in FIGS. 1 to 8, the trimmer body 20 includes a housing 22, a motor 34, a trigger 42 as an operation unit, a speed setting dial 46 as a display unit, and a lock button 52.

[0023] <About Housing 22> The housing 22 forms the outer shell of the trimmer body 20. The housing 22 has a double structure. Specifically, the housing 22 includes an inner housing 24 that forms the inner peripheral portion of the housing 22, and an outer housing 30 that forms the outer peripheral portion of the housing 22 (see FIG. 8).

[0024] The inner housing 24 is made of resin. The inner housing 24 is formed in a generally cylindrical shape with a bottom that is open downward. Specifically, the inner housing 24 includes an upper housing portion 24A (enlarged diameter portion) that forms the upper portion of the inner housing 24, and a cylindrical inner tube 24B (grip portion) that extends downward from the upper housing portion 24A. The upper housing portion 24A is formed in a generally rectangular shape when viewed from below, and protrudes further in the first direction than the inner tube 24B (the direction of arrow C in FIGS. 5 and 6).

[0025] The inner housing 24 is also divided into two parts in the second direction. Specifically, the inner housing 24 is configured to include a first divided housing 26 that forms one side of the inner housing 24 in the second direction (the side indicated by arrow E in FIGS. 1 to 4), and a second divided housing 28 that forms the other side of the inner housing 24 in the second direction (the side indicated by arrow F in FIGS. 1 to 4). The first divided housing 26 and the second divided housing 28 are fixed together with their openings butted against each other.

[0026] A trigger attachment portion 24C for attaching a trigger 42 (described later) is formed at the upper end of the inner cylinder 24B on one side in the first direction, and the trigger attachment portion 24C protrudes toward the one side in the first direction relative to the inner cylinder 24B. Also, a dial attachment portion 24D for attaching a speed setting dial 46 (described later) is formed at the upper end of the inner cylinder 24B on the other side in the first direction (the side indicated by arrow D in FIGS. 5 and 6), and the dial attachment portion 24D protrudes toward the other side in the first direction relative to the inner cylinder 24B.

[0027] The upper housing portion 24A is formed with a battery mounting portion 24E (see FIGS. 2 and 8) for mounting a battery 58 (described later), and the battery mounting portion 24E is formed in a recessed shape that is open upward and toward the other side in the first direction. The upper housing portion 24A is also provided with a connector 32 (see FIGS. 2 and 8), and the upper portion of the connector 32 is exposed inside the battery mounting portion 24E so as to be connectable to the battery 58 (described later).

[0028] The outer housing 30 is made of metal. The outer housing 30 has a generally cylindrical outer tube 30A with its axis extending vertically. The inner tube 24B of the inner housing 24 is inserted into the outer tube 30A. The inner tube 24B of the inner housing 24 and the outer tube 30A of the outer housing 30 form the tubular portion 22A of the housing 22. A flange portion 30B protruding radially outward is formed at the upper end of the outer tube 30A. The flange portion 30B is generally rectangular, as viewed from below, corresponding to the upper housing portion 24A. The outer peripheral edge of the flange portion 30B is bent upward. The flange portion 30B is positioned to cover the lower end of the upper housing portion 24A from below and is fixed to the inner housing 24.

[0029] An exposure hole 30C (see FIG. 8) for exposing the trigger attachment portion 24C described above is formed through the upper end of the outer housing 30 at one side in the first direction. Also, a recess 30D (see FIG. 8) for exposing the dial attachment portion 24D described above is formed through the upper end of the outer housing 30 at the other side in the first direction, and the recess 30D is open upward.

[0030] 7, a first rack 72 and a second rack 74 are formed on the outer periphery of the outer tube 30A as a pair of racks and engaging portions that constitute the lifting mechanism 70 described below. The first rack 72 is formed on one side of the outer tube 30A in the second direction, and the second rack 74 is formed on the other side of the outer tube 30A in the second direction, and the first rack 72 and the second rack 74 extend in the vertical direction. In other words, the first rack 72 and the second rack 74 are arranged 180 degrees apart in the circumferential direction of the outer tube 30A.

[0031] The first rack 72 has a plurality of rack grooves 72A, which extend in the circumferential direction of the outer tube 30A and open radially outward from the outer tube 30A. The plurality of rack grooves 72A are arranged vertically at equal intervals. The portions between vertically adjacent rack grooves 72A are configured as rack teeth 72B. As a result, in the first rack 72, the plurality of rack teeth 72B are arranged vertically at equal intervals.

[0032] The second rack 74 is configured similarly to the first rack 72. That is, the second rack 74 has a plurality of rack grooves 74A aligned in the vertical direction. In addition, in the second rack 74, the portions between vertically adjacent rack grooves 74A are configured as rack teeth 74B, and the plurality of rack teeth 74B are aligned at equal intervals in the vertical direction.

[0033] <About Motor 34> As shown in FIGS. 6 and 7 , the motor 34 is configured as a brushless motor. The motor 34 is disposed coaxially within the inner cylinder 24B of the inner housing 24 and fixed to the inner cylinder 24B. The upper end of an output shaft 34A of the motor 34 is rotatably supported by a first bearing 36 provided in the inner cylinder 24B, and the lower end portion of the output shaft 34A is rotatably supported by a second bearing 38 provided in the inner cylinder 24B. The lower end (tip) of the output shaft 34A protrudes below the lower end of the housing 22. A collector chuck 40 is provided at the lower end of the output shaft 34A, and a tool T is detachably fixed to the collector chuck 40. The motor 34 is electrically connected to a control unit 90 (described later) and is driven by the control unit 90. As a result, the tool T, which rotates together with the output shaft 34A, performs cutting on a workpiece.

[0034] <About Trigger 42> As shown in FIGS. 1 to 3, 5, and 6, the trigger 42 is configured as an operating part for driving or stopping the motor 34. The trigger 42 is attached to the trigger attachment portion 24C of the inner housing 24 and is exposed from the housing 22 so as to be operable toward one side in the first direction. That is, the trigger 42 is provided at the joint between the first divided housing 26 and the second divided housing 28 of the inner housing 24. The upper end of the trigger 42 is rotatably supported by the inner housing 24 with the second direction as its axial direction. This allows the trigger 42 to be rotated between an initial position (the position indicated by the solid line in FIG. 6) and an operating position (the position indicated by the two-dot chain line in FIG. 6) rotated counterclockwise from the initial position as viewed from one side in the second direction. The trigger 42 is biased toward the initial position by a biasing spring (not shown), and is held in the initial position when the trigger 42 is not operated.

[0035] A microswitch 44 (see FIG. 6) is provided on the other side in the first direction at the lower end of the trigger 42, and the microswitch 44 is electrically connected to a control unit 90, which will be described later. When the trigger 42 is operated from the initial position to the operating position, the lower end of the trigger 42 presses the microswitch 44, and the microswitch 44 outputs a detection signal to the control unit 90.

[0036] <About speed setting dial 46> As shown in FIGS. 4 to 6 , the speed setting dial 46 is configured as a dial for changing the rotation speed of the motor 34. In other words, the speed setting dial 46 also functions as a second operating part. The speed setting dial 46 is formed in a generally circular plate shape with the vertical direction as the plate thickness direction. The speed setting dial 46 is rotatably supported by the inner housing 24 with the vertical direction as the axial direction, and is exposed from the dial attachment portion 24D of the inner housing 24 so as to be operable toward the other side in the first direction. As a result, the speed setting dial 46 is disposed 180 degrees apart from the trigger 42 in the circumferential direction of the outer cylinder 30A, and is provided at the joint between the first divided housing 26 and the second divided housing 28 of the inner housing 24.

[0037] 6, an encoder 48 for detecting the rotational position of the speed setting dial 46 is provided above the speed setting dial 46, and the encoder 48 is electrically connected to a control unit 90. When the speed setting dial 46 rotates, a detection signal corresponding to the rotational position of the speed setting dial 46 is output from the encoder 48 to the control unit 90. A scale is printed or otherwise indicated on the outer periphery of the speed setting dial 46, and the operator is configured to set the rotational speed of the speed setting dial 46 by referring to the scale.

[0038] <About Lock Button 52> As shown in FIGS. 4 and 6 , the lock button 52 is disposed above the speed setting dial 46 and is operably provided on the upper housing portion 24A of the inner housing 24. That is, the lock button 52 is provided at the joint between the first divided housing 26 and the second divided housing 28 of the inner housing 24. Furthermore, the first rack 72 and second rack 74 described above are disposed between the trigger 42, the speed setting dial 46, and the lock button 52 in the circumferential direction of the tubular portion 22A. Specifically, the trigger 42, the first rack 72, the speed setting dial 46, the lock button 52, and the second rack 74 are disposed side by side in this order on one side of the circumferential direction of the tubular portion 22A of the housing 22 (the side indicated by arrow G in FIG. 1 ), and are disposed at 90-degree intervals. The lock button 52 is formed in a substantially rectangular shape when viewed from the other side in the first direction, and is made of an elastic member.

[0039] As shown in FIG. 6 , a button substrate 54 is provided adjacent to one side of the lock button 52 in the first direction, and a tactile switch 56 is mounted on the button substrate 54. The tactile switch 56 is electrically connected to a control unit 90, which will be described later. When the lock button 52 is pressed, the tactile switch 56 outputs a detection signal to the control unit 90. As will be described in detail later, the lock button 52 is configured as a button that prohibits or permits driving of the motor 34 when the battery 58 is connected to the connector 32 of the housing 22. The lock button 52 is also configured as a button that continues or stops driving the motor 34 while the motor 34 is in operation.

[0040] (Base 60) 1 to 7, the base 60 is made of metal and is formed in a generally cylindrical shape with a bottom that is open upward. Specifically, the base 60 includes a base main body 62 and a plate portion 64 that forms the lower end of the base 60.

[0041] The base body 62 is formed in a substantially cylindrical shape, and a portion of the base body 62 in the circumferential direction is open. That is, a slit 62A extending in the vertical direction is formed in the base body 62, and the slit 62A penetrates the base body 62 in the vertical direction and in the radial direction. The width dimension of this slit 62A is set larger than the width dimensions of the first rack 72 and the second rack 74. The base body 62 (base 60) is inserted from below into the cylindrical portion 22A of the housing 22, and is connected to the outer cylinder 30A so as to be movable up and down in the vertical direction by an elevating mechanism 70, which will be described later. Specifically, the relative position of the base 60 with respect to the housing 22 in the circumferential direction of the tubular portion 22A is set so that the first rack 72 or the second rack 74 is disposed inside the slit 62A, and the base main body 62 (base 60) is fitted onto the outer cylinder 30A (in the example shown in FIGS. 1 to 7, the base main body 62 (base 60) is fitted onto the outer cylinder 30A so that the first rack 72 is disposed inside the slit 62A). The tubular portion 22A and the base main body 62 of the housing 22 are configured as a gripping part to be gripped by an operator.

[0042] An opening 62B is formed in the lower end of the base body 62 at one side in the second direction, and the opening 62B is formed in a concave shape that is open downward when viewed from one side in the second direction. The lower end of the slit 62A is connected to the opening 62B. This allows the tool T fixed to the output shaft 34A to be seen through the opening 62B when the base 60 is connected to the housing 22.

[0043] A pair of base-side mounting portions 62C for mounting fixing members 76 of the lifting mechanism 70, which will be described later, are formed at the upper end of the base main body 62. The pair of base-side mounting portions 62C are formed on the circumferential outer side of the base main body 62 with respect to the slits 62A, and protrude radially outward from the base main body 62.

[0044] The plate portion 64 is formed in a generally rectangular plate shape with its thickness extending in the vertical direction, and is connected to the lower end of the base body 62. An insertion portion 64A (see FIGS. 6 and 7) is formed through the approximate center of the plate portion 64, allowing the output shaft 34A and the tool T to be inserted therethrough.

[0045] A bevel base 66 is provided below the plate portion 64, and is formed in a generally rectangular plate shape with its thickness extending in the up-down direction. The bevel base 66 is fixed to the plate portion 64 with fixing members such as screws. Similar to the plate portion 64, the bevel base 66 is formed with an insertion portion 66A (see FIGS. 6 and 7) that penetrates the bevel base 66 and allows the tool T to be inserted therethrough.

[0046] (About Battery 58) As shown in FIGS. 1 and 2, the battery 58 is formed in a substantially rectangular parallelepiped shape. The battery 58 is attached to the battery attachment portion 24E of the housing 22 from the other side in the first direction. The battery 58 has a connector (not shown), and when the battery 58 is attached to the battery attachment portion 24E, the connector is connected to the connector 32, and power is supplied from the battery 58 to the control unit 90. The battery 58 also has a pair of locking members 58A, which are provided on one and the other side portions of the battery 58 in the second direction. When the battery 58 is attached to the battery attachment portion 24E, the locking members 58A engage with the upper housing portion 24A of the housing 22, restricting movement of the battery 58 toward the other side in the first direction.

[0047] (Regarding the lifting mechanism 70) As shown in FIGS. 1 to 5 and 7, the lifting mechanism 70 includes a first rack 72 and a second rack 74 formed on the housing 22 described above, and a fixing member 76.

[0048] The fixing member 76 is formed in the shape of a shaft with its axial direction in a direction perpendicular to the up-down direction (the first direction in the example shown in FIGS. 1 to 5 and 7). A knob portion 76A having a larger diameter than the fixing member 76 is formed integrally with the base end portion (the end portion on one side in the first direction) of the fixing member 76. The fixing member 76 is rotatably supported by the base-side mounting portion 62C of the base 60. A cylindrical collar 78 is fitted onto the fixing member 76, and the collar 78 is disposed between the knob portion 76A and the base-side mounting portion 62C on one side in the first direction. The collar 78 may be formed integrally with the fixing member 76.

[0049] Furthermore, a female thread is formed on the outer periphery at the tip of the fixing member 76. A nut 80 is threaded onto this female thread, and the nut 80 is disposed on the other side in the first direction with respect to the base-side mounting portions 62C on the other side in the first direction. In other words, the pair of base-side mounting portions 62C are sandwiched in the circumferential direction of the base 60 by the nut 80 and the collar 78. As a result, by fastening the nut 80 to the base-side mounting portions 62C and tightening the pair of base-side mounting portions 62C in the circumferential direction of the base 60, the base 60 is fixed to the housing 22.

[0050] A pinion 82 serving as an engaged portion and a rotating member is integrally formed at an axially intermediate portion of the fixed member 76. The pinion 82 is formed in a cylindrical shape with a diameter larger than that of the fixed member 76 and is disposed coaxially with the fixed member 76. The fixed member 76 and the pinion 82 may be configured as separate members, with the pinion 82 fixed to the fixed member 76 so as to be integrally rotatable. Furthermore, the widths of the first rack 72 and the second rack 74 along the circumferential direction of the cylindrical portion 22A of the housing 22 are set to be slightly larger than the width (axial length) of the pinion 82.

[0051] A plurality of pinion teeth 82A (see FIG. 7) are formed on the outer periphery of the pinion 82, and the plurality of pinion teeth 82A are formed over the entire circumferential circumference of the pinion 82. The pinion teeth 82A are arranged in the rack groove 72A of the first rack 72 or in the rack groove 74A of the second rack 74 of the housing 22, and are configured to mesh with the rack teeth 72B or the rack teeth 74B (in the example shown in FIGS. 1 to 7, the pinion teeth 82A mesh with the rack teeth 72B).

[0052] As a result, when the nut 80 is released from the base-side mounting portion 62C and the fixing member 76 is rotated about its own axis, the pinion 82 rotates relative to the first rack 72 (second rack 74), causing the base 60 to move up and down relative to the housing 22. The pinion teeth 82A are disposed within the rack groove 72A (rack groove 74A). As a result, when the base 60 moves up and down relative to the housing 22, the pinion teeth 82A engage with both longitudinal ends of the rack groove 72A (rack groove 74A), thereby restricting the rotation of the base 60 relative to the housing 22. After adjusting the elevation position of the base 60, the nut 80 is fastened to the base-side mounting portion 62C, thereby fixing the base 60 in the adjusted position. A trigger mounting portion 24C is located above the base 60, restricting the upward movement of the base 60. That is, the trigger mounting portion 24C functions as a stopper that restricts the movement of the base 60.

[0053] (Regarding the controller 100) The controller 100 is accommodated inside the upper housing portion 24A of the housing 22 and is fixed to the upper housing portion 24A. The controller 100 has an inverter unit 110, which will be described later, and a control unit 90. The connector 32, motor 34, microswitch 44, encoder 48, and tactile switch 56, which are described above, are electrically connected to the controller 100. The control unit 90 controls the operation of the motor 34 in response to the operation of the trigger 42 and lock button 52. The control unit 90 also controls the rotation speed of the motor 34 in response to the rotation position of the speed setting dial 46.

[0054] <Electrical configuration> The electrical configuration of the electric trimmer 10 will be described with reference to the functional (circuit) block diagram of FIG. The controller 100 has a control circuit board (not shown), on which an inverter unit 110 and a control unit 90 are mounted. The control unit 90 has a calculation unit 91, which performs various controls such as drive control of the inverter unit 110. The calculation unit 91 is a microcomputer. The inverter unit 110 is a circuit in which switching elements 110a (six in this example) are bridge-connected. The detection resistor 120 is provided in the path of the drive current of the brushless motor serving as the motor 34. The control circuit voltage supply circuit 130 converts the voltage of the battery 58 into a voltage suitable for the operation of the control unit 90 and supplies it to the control unit 90. The magnetic sensor 107 is, for example, a Hall element, and outputs a signal corresponding to the rotational position of the brushless motor serving as the motor 34.

[0055] In the control unit 90, a motor current detection circuit 94 detects the drive current of the brushless motor serving as the motor 34 from the terminal voltage of the detection resistor 120. A switch operation detection circuit 95 detects the operation of a trigger 42 serving as an operation unit by a user. A rotor position detection circuit 92 detects the rotational position of the brushless motor serving as the motor 34 based on a signal from a magnetic sensor 107. A motor rotation speed detection circuit 93 detects the rotation speed of the brushless motor serving as the motor 34 based on the signal from the rotor position detection circuit 92. A calculation unit 91 calculates the rotation speed of the brushless motor serving as the motor 34 based on the detection result of the rotor position detection circuit 92.

[0056] The control unit 90 changes the control state differently depending on whether the tactile switch 56 (lock button 52) serving as the state switching unit is operated when the brushless motor serving as the motor 34 is in a non-driving state or whether the tactile switch 56 (lock button 52) serving as the state switching unit is operated when the brushless motor serving as the motor 34 is in a driving state. For example, when the brushless motor serving as the motor 34 is in a driving state, the control unit 90 has two control states: an on-lock state in which driving of the brushless motor serving as the motor 34 is maintained even when operation of the trigger 42 serving as the operating unit is released, and an on-lock release state in which driving of the brushless motor serving as the motor 34 is stopped by releasing operation of the trigger 42 serving as the operating unit. An example of such a control state is switching between the on-lock state and the on-lock release state based on operation of the tactile switch 56 (lock button 52) serving as the state switching unit. Another example is where the control unit 90 controls to release the on-lock state based on operation of the trigger 42 serving as the operating unit when the brushless motor serving as the motor 34 is in the on-lock state.

[0057] (Operation of the electric trimmer 10) Next, the operation of the electric trimmer 10 will be described with reference to the flowchart shown in FIG.

[0058] In the operation of the electric trimmer 10, in step 1 (S1), the battery 58 is attached to the battery mounting portion 24E of the housing 22, and the battery 58 is connected to the connector 32. After the battery 58 is connected to the connector 32, the process proceeds to step 2 (S2).

[0059] In step 2, the control unit 90 sets the motor 34 in a state where it is prohibited to drive (off-lock state). After the process of step 2, the process proceeds to step 3 (S3).

[0060] In step 3, the control unit 90 determines whether or not the lock button 52 has been pressed, based on the output signal of the tactile switch 56. If the lock button 52 has not been pressed in step 3 (No in step 3), the process returns to step 2. That is, the off-lock state of the motor 34 is maintained. On the other hand, if the lock button 52 has been pressed in step 3 (Yes in step 3), the process proceeds to step 4 (S4).

[0061] In step 4, the control unit 90 is set to a state in which driving of the motor 34 is permitted (an off-lock release state, also referred to as a drive standby state of the motor 34). After processing of step 4, the process proceeds to step 5 (S5).

[0062] In step 5, the control unit 90 determines whether or not the trigger 42 has been operated to the operating position based on the output signal of the microswitch 44. If the trigger 42 has been operated to the operating position in step 5 (Yes in step 5), the process proceeds to step 6.

[0063] In step 6, the control unit 90 drives the motor 34. This causes the output shaft 34A of the motor 34 to rotate about its own axis, and the operator performs cutting on the workpiece with the tool T. At this time, the control unit 90 rotates the output shaft 34A at a rotation speed that corresponds to the rotation position of the speed setting dial 46. After processing step 6, the process proceeds to step 7 (S7).

[0064] In step 7, the control unit 90 determines whether or not the trigger 42 is being continuously operated to the operation position based on the output signal of the microswitch 44. In step 7, if the trigger 42 is not being continuously operated to the operation position, that is, if the trigger 42 has returned to the initial position (No in step 7), the process proceeds to step 8 (S8).

[0065] In step 8, the control unit 90 stops driving the motor 34. That is, when the operator releases the operation of the trigger 42, the control unit 90 stops driving the motor 34. After the processing of step 8, the process returns to step 5.

[0066] On the other hand, in step 7, if the operation of the trigger 42 to the operation position is continued (if Yes in step 7), the process proceeds to step 9 (S9).

[0067] In step 9, the control unit 90 determines whether or not the lock button 52 has been pressed, based on the output signal from the tactile switch 56. If the lock button 52 has not been pressed in step 9 (No in step 9), the process returns to step 7. On the other hand, if the lock button 52 has been pressed in step 9 (Yes in step 9), the process proceeds to step 10 (S10).

[0068] In step 10, the control unit 90 sets the motor 34 in a state (on-lock state) in which the driving of the motor 34 is maintained. That is, when the lock button 52 is pressed while the trigger 42 is in the operating position, the state transitions to the on-lock state in which the driving of the motor 34 is maintained. After the processing of step 10, the process proceeds to step 11 (S11).

[0069] In step 11, the control unit 90 determines whether or not the trigger 42 has been returned to the initial position based on the output signal of the microswitch 44. If the trigger 42 has not been returned to the initial position in step 11 (No in step 11), the process returns to step 10. In other words, if the operator continues to operate the trigger 42 to the operating position, the process returns to step 10, and the on-lock state is maintained.

[0070] On the other hand, if the trigger 42 is returned to the initial position in step 11 (if Yes in step 11), the process proceeds to step 12 (S12). That is, even if the operator releases the operation of the trigger 42, the on-lock state of the motor 34 is maintained, and the process proceeds to step 12.

[0071] In step 12, the control unit 90 determines whether or not the lock button 52 has been pressed, based on the output signal of the tactile switch 56. If the lock button 52 has been pressed in step 12 (Yes in step 12), the process proceeds to step 13 (S13).

[0072] In step 13, the control unit 90 stops driving the motor 34. That is, when the lock button 52 is pressed while the motor 34 is in the on-lock state, the on-lock state of the motor 34 is released, and the motor 34 stops. After processing step 13, the process returns to step 5.

[0073] On the other hand, if the lock button 52 is not pressed in step 12 (No in step 12), the process proceeds to step 14 (S14).

[0074] In step 14, the control unit 90 determines whether or not the trigger 42 has been operated to the operating position based on the output signal of the microswitch 44. If the trigger 42 has not been operated to the operating position in step 14 (No in step 14), the process returns to step 12. That is, the on-lock state of the motor 34 is maintained. On the other hand, if the trigger 42 has been operated to the operating position in step 14 (Yes in step 14), the process proceeds to step 15 (S15).

[0075] In step 15, the control unit 90 stops driving the motor 34. That is, when the lock button 52 is not pressed and the trigger 42 is again operated to the operating position while the motor 34 is in the on-lock state, the on-lock state of the motor 34 is released and the motor 34 stops. After processing step 15, the process proceeds to step 16 (S16).

[0076] In step 16, the control unit 90 determines whether the trigger 42 has returned to the initial position based on the output signal of the microswitch 44. If the trigger 42 has not returned to the initial position in step 16 (No in step 16), the process returns to step 15. That is, the motor 34 remains stopped. On the other hand, if the trigger 42 has returned to the initial position in step 16 (Yes in step 16), the process returns to step 5. That is, if the operator's operation of the trigger 42 is released, the process returns to step 5 with the motor 34 stopped. As a result, the trigger 42 is operated to the operating position again, and the control unit 90 drives the motor 34 again.

[0077] On the other hand, in step 5, if the trigger 42 is not operated to the operation position (No in step 5), the process proceeds to step 17 (S17).

[0078] In step 17, the control unit 90 determines whether or not the lock button 52 has been pressed, based on the output signal from the tactile switch 56. If the lock button 52 has been pressed in step 17 (Yes in step 17), the process returns to step 2. That is, the control unit 90 transitions the motor 34 from the drive standby state to the off-lock state. On the other hand, if the lock button 52 has not been pressed in step 17 (No in step 17), the process proceeds to step 18 (S18).

[0079] In step 18, the control unit 90 determines whether the lock button 52 has been pressed within a predetermined time (10 seconds in this embodiment) based on the output signal from the tactile switch 56. Also in step 18, the control unit 90 determines whether the trigger 42 has been operated to the operating position within the predetermined time based on the output signal from the microswitch 44. That is, in step 18, the control unit 90 determines whether the lock button 52 or the trigger 42 has been operated within the predetermined time.

[0080] In step 18, if the lock button 52 or the trigger 42 is operated within the predetermined time (if Yes in step 18), the process returns to step 5. That is, the motor 34 returns to the drive standby state. On the other hand, in step 18, if the lock button 52 or the trigger 42 is not operated within the predetermined time (if No in step 18), the process returns to step 2. That is, if the lock button 52 or the trigger 42 is not operated while the motor 34 is in the drive standby state, the control unit 90 transitions the motor 34 from the drive standby state to the off-lock state.

[0081] (Action and effect) Next, the procedure for assembling the base 60 to the housing 22 will be described, and the effects of the electric trimmer 10 of this embodiment will be described.

[0082] When assembling the base 60 to the housing 22, the nut 80 of the lifting mechanism 70 is loosened to release the nut 80 from the base-side mounting portion 62C. This allows the base 60 (base main body 62) to be fitted onto the cylindrical portion 22A of the housing 22. In this state, the base 60 is placed below the housing 22, and the slit 62A of the base 60 is aligned with the first rack 72 or the second rack 74 in the circumferential direction of the cylindrical portion 22A. Then, the base main body 62 of the base 60 is fitted onto the cylindrical portion 22A from below. At this time, the pinion 82 of the lifting mechanism 70 is engaged with the rack teeth 72B of the first rack 72 or the rack teeth 74B of the second rack 74.

[0083] The lifting mechanism 70 adjusts the lifting position of the base 60 in accordance with the cutting process performed on the workpiece. Specifically, by rotating the knob portion 76A of the fixing member 76, the pinion 82 rotates relative to the first rack 72 or the second rack 74. As a result, the base 60 moves vertically relative to the housing 22, and the lifting position of the base 60 is adjusted.

[0084] After adjusting the elevation position of the base 60, the nuts 80 are fastened to the base-side mounting portions 62C. As a result, the pair of base-side mounting portions 62C of the base 60 are fastened together by the collar 78 of the fixing member 76 and the nuts 80, and the base 60 is fixed to the housing 22. This completes the assembly work of the base 60 to the housing 22.

[0085] Here, the lifting mechanism 70 has a first rack 72 and a second rack 74, which are formed on the tubular portion 22A (outer cylinder 30A) of the housing 22 and extend in the up-down direction. The first rack 72 and the second rack 74 are arranged spaced apart in the circumferential direction of the outer cylinder 30A. The lifting mechanism 70 also has a pinion 82 provided on the base 60, which is meshed with the first rack 72 or the second rack 74. Therefore, the position of the base 60 when the pinion 82 meshes with the first rack 72 (hereinafter, this position will be referred to as the first position) and the position of the base 60 when the pinion 82 meshes with the second rack 74 (hereinafter, this position will be referred to as the second position) can be set to different positions in the circumferential direction of the tubular portion 22A. That is, the lifting mechanism 70 connects the housing 22 and the base 60 so that the position of the base 60 in the circumferential direction of the tubular portion 22A can be changed. Therefore, the base 60 can be placed in a first position or a second position depending on the working style of the worker. In other words, the fixed member 76 (pinion 82) of the lifting mechanism 70 provided on the base 60 can be set to a position depending on the working style of the worker. Therefore, the workability for the worker can be improved.

[0086] In the present embodiment, as described above, a plurality of racks (first rack 72 and second rack 74) are formed on the outer tube 30A in the circumferential direction of the tubular portion 22A of the housing 22. Furthermore, the width of each of the first rack 72 and the second rack 74 along the circumferential direction of the tubular portion 22A is set to be larger than the width of the pinion 82. Therefore, the total length of the racks along the circumferential direction of the tubular portion 22A (the sum of the widths of the first rack 72 and the second rack 74) is set to be at least twice the width of the pinion 82. In other words, in the present invention, the "total length of the rack along the circumferential direction of the tubular portion" refers to the sum of the widths of the plurality of racks (first rack 72 and second rack 74) when a plurality of racks (first rack 72 and second rack 74) are formed on the outer tube 30A as in the present embodiment. This allows the lifting mechanism 70 to change the position of the base 60 in the circumferential direction of the outer tube 30A, as described above.

[0087] In the lifting mechanism 70, the first rack 72 (second rack 74) formed in the housing 22 has a plurality of rack grooves 72A (rack grooves 74A) aligned in the vertical direction, and the rack grooves 72A (rack grooves 74A) extend circumferentially around the outer cylinder 30A and open radially outward from the outer cylinder 30A. The portions between adjacent rack grooves 72A (rack grooves 74A) in the vertical direction are configured as rack teeth 72B (rack teeth 74B). In addition, in the lifting mechanism 70, the pinion teeth 82A of the pinion 82 provided on the base 60 are inserted into the rack grooves 72A (rack grooves 74A) and mesh with the rack teeth 72B (rack teeth 74B). Therefore, when the lifting mechanism 70 is operating and the base 60 is about to rotate relative to the housing 22, the pinion teeth 82A engage with both longitudinal ends of the rack groove 72A (rack groove 74A), restricting the rotation of the base 60 relative to the housing 22. This makes it possible to prevent the base 60 from rotating relative to the housing 22 when the lifting mechanism 70 is used to adjust the lift position of the base 60. This further improves workability for the worker.

[0088] Furthermore, a trigger 42 for driving or stopping the motor 34 is provided on one side in the first direction on the cylindrical portion 22A (inner cylinder 24B) of the housing 22. Therefore, the relative position of the fixed member 76 (pinion 82) of the lifting mechanism 70 and the trigger 42 in the circumferential direction of the cylindrical portion 22A can be set according to the working style of the worker. This allows, for example, the worker to operate the trigger 42 while holding the base 60 (base main body 62) in a position that does not interfere with the fixed member 76 (pinion 82). Therefore, workability for the worker can be effectively improved.

[0089] Moreover, the trigger 42 is disposed between the first rack 72 and the second rack 74 in the circumferential direction of the tubular portion 22A of the housing 22. More specifically, in the circumferential direction of the tubular portion 22A, the first rack 72 is disposed 90 degrees apart from the trigger 42 on one circumferential side, and the second rack 74 is disposed 90 degrees apart from the trigger 42 on the other circumferential side. Therefore, when the base 60 is in the first position, the fixing member 76 (pinion 82) can be disposed at a position 90 degrees apart from the trigger 42 on one circumferential side of the tubular portion 22A, and when the base 60 is in the second position, the fixing member 76 (pinion 82) can be disposed at a position 90 degrees apart from the trigger 42 on the other circumferential side of the tubular portion 22A. As a result, for example, by positioning the operator on the other side in the first direction with respect to the base 60 disposed at the first position, the operator can grip the base body 62 with his / her right hand and operate the trigger 42 with the fingers of his / her right hand while avoiding interference with the fixed member 76 (pinion 82). Furthermore, for example, by positioning the operator on the other side in the first direction with respect to the base 60 disposed at the second position, the operator can grip the base body 62 with his / her left hand and operate the trigger 42 with the fingers of his / her left hand while avoiding interference with the fixed member 76 (pinion 82). That is, by setting the base 60 at the first position or the second position, the electric trimmer 10 can be set as a tool for right-handed or left-handed use. This can further effectively improve operability for the operator.

[0090] Furthermore, the cylindrical portion 22A (inner cylinder 24B) of the housing 22 is provided with a speed setting dial 46 and a lock button 52 on the other side in the first direction. Therefore, the relative positions of the fixed member 76 (pinion 82) of the lifting mechanism 70, the speed setting dial 46, and the lock button 52 in the circumferential direction of the cylindrical portion 22A can be set according to the working style of the worker. This allows, for example, the worker to hold the base 60 (base main body 62) in a position that does not interfere with the fixed member 76 (pinion 82), and perform work with the speed setting dial 46 and the lock button 52 positioned closer to (in front of) the worker. Therefore, workability for the worker can be effectively improved.

[0091] Moreover, the trigger 42, first rack 72, speed setting dial 46, lock button 52, and second rack 74 are arranged in this order on one circumferential side of the cylindrical portion 22A of the housing 22, and are arranged at 90-degree intervals around the cylindrical portion 22A. Therefore, for example, by positioning the base 60 at the other side in the first direction relative to the base 60 arranged at the first position (second position), the operator can operate the trigger 42 with the fingers of his or her right hand (left hand) while grasping the base body 62 with his or her right hand (left hand) with the speed setting dial 46 and lock button 52 positioned directly in front of the operator. As a result, the operator can operate the speed setting dial 46 and lock button 52 with his or her left hand (right hand) while visually checking the display scale of the speed setting dial 46 and the lock button 52. This allows the electric trimmer 10 to be set as a right-handed or left-handed tool, and the trigger 42, speed setting dial 46, and lock button 52 to be positioned for easy operation by the operator. Therefore, the workability for the worker can be improved more effectively.

[0092] In addition, in this embodiment, the trigger 42 is provided on the outer cylinder 30A (gripping portion), allowing the motor 34 to be quickly turned on and off when working with one hand. Even if the gripping state is released while the trigger 42 is being operated, the motor 34 stops, preventing damage to the workpiece. Furthermore, the motor 34 can be kept on by operating the lock button 52. This allows work to continue even when the force exerted on the trigger 42 is released, reducing fatigue during work. Furthermore, off-lock control can be executed so that the motor 34 will not be driven even if the trigger 42 is operated unless the lock button 52 is operated. Therefore, even if a foreign object comes into contact with the trigger 42 while not working, the motor 34 will not be driven, preventing adverse effects such as wasted energy consumption. Furthermore, by configuring the transition to the on-lock state to be similarly performed by the lock button 52, which releases the off-lock state, the number of parts in the control switch can be reduced, and the transition from the off-lock release to the on-lock state can be performed in the same gripping state. In particular, in this embodiment, the transition from the off-lock release state to the on-lock state can be performed by operating with two fingers while holding the device, which greatly improves operability.

[0093] In this embodiment, two racks (first rack 72 and second rack 74) are formed on the outer cylinder 30A of the housing 22. However, three or more racks may be formed on the outer cylinder 30A, or only one rack may be formed on the outer cylinder 30A. When one rack is formed on the outer cylinder 30A, the width of the rack along the circumferential direction of the tubular portion 22A is set to at least twice the width of the pinion 82. For example, the width of the rack is set to 1 / 2 of the entire circumference of the outer cylinder 30A. As a result, even in this case, the entire length of the rack along the circumferential direction of the tubular portion 22A is set to at least twice the width of the pinion 82. Therefore, even when one rack is formed on the outer cylinder 30A, the position of the base 60 in the circumferential direction of the outer cylinder 30A can be changed by the lifting mechanism 70. Furthermore, when forming a rack at one location on the outer tube 30A, the relative position of the base 60 to the housing 22 in the circumferential direction of the tube portion 22A can be changed by loosening the nut 80 without removing the base 60 from the housing 22.

[0094] Furthermore, in the present embodiment, as described above, multiple (two) racks (first rack 72 and second rack 74) are formed on outer cylinder 30A of housing 22, and pinion 82 is provided on base 60. Alternatively, one of first rack 72 and second rack 74 may be formed on outer cylinder 30A, and multiple pinions 82 may be provided on base 60. Even in this case, the position of base 60 relative to housing 22 in the circumferential direction of tubular portion 22A can be changed by lifting mechanism 70.

[0095] In addition, in this embodiment, the first rack 72 and the second rack 74 are formed on the housing 22, and the pinion 82 is provided on the base 60, but it is also possible to configure the pinion 82 to be provided on the housing 22, and the first rack 72 and the second rack 74 to be formed on the base 60.

[0096] In the present embodiment, the first rack 72 is disposed 90 degrees apart from the trigger 42 on one side in the circumferential direction of the tubular portion 22A, and the second rack 74 is disposed 90 degrees apart from the trigger 42 on the other side in the circumferential direction, but the angles at which the first rack 72 and the second rack 74 are disposed relative to the trigger 42 on the circumferential direction of the tubular portion 22A can be set arbitrarily. Even in this case, the electric trimmer 10 can be set as a tool for right-handed or left-handed use.

[0097] In addition, in this embodiment, the lifting mechanism 70 is configured as a so-called rack and pinion mechanism, but the configuration of the lifting mechanism 70 is not limited to this. A modified example of the lifting mechanism 70 will be described below with reference to FIG. 11.

[0098] As shown in FIG. 11 , a modified example of the lifting mechanism 70 is configured as a screw mechanism. That is, in this modified example of the lifting mechanism 70, a rotating member 170 serving as an engaged portion is provided on the housing 22, and a plurality of nuts 172 (two in this modified example) serving as engaging portions are provided on the base 60. The rotating member 170 is formed in a generally cylindrical shape extending in the vertical direction. Specifically, the rotating member 170 includes an operation knob 170A constituting the upper end of the rotating member 170, and a threaded shaft 170B extending downward from the operation knob 170A. The threaded shaft 170B has a smaller diameter than the operation knob 170A, and the upper end and a longitudinal intermediate portion of the threaded shaft 170B are rotatably supported by the housing 22. In addition, a male thread is formed on the outer periphery of the lower portion of the threaded shaft 170B.

[0099] A pair of nuts 172 are fixed to the outer periphery of the upper end of the base 60 and are arranged 180 degrees apart in the circumferential direction of the base 60. A screw shaft 170B is threadedly engaged with one of the nuts 172. As a result, by rotating the operation knob 170A, the rotating member 170 rotates about its axial direction, which is the up-and-down direction, and the base 60 moves up and down in the housing 22. Furthermore, by threading the screw shaft 170B into the other nut 172, the position of the base 60 in the circumferential direction of the tubular portion 22A can be changed. Therefore, in the modified example of the lifting mechanism 70, as in the present embodiment, workability can be improved. Note that when the lifting mechanism 70 is configured as a screw mechanism, a separate mechanism for fixing the base 60 to the housing 22 may be provided.

[0100] Furthermore, in the modified example of the lifting mechanism 70, multiple nuts 172 are provided on the base 60, but multiple rotating members 170 may be provided on the housing 22. Alternatively, the nuts 172 may be provided on the housing 22, and the rotating members 170 may be provided on the base 60.

[0101] In addition, in this embodiment, the electric trimmer 10 has been described as an example of control using the lock button 52 (control switch), but the present invention can also be applied to other power tools. Modified examples will be described below with reference to Figures 12 and 13.

[0102] FIG. 12 shows a circular saw 11, a modified example of a power tool. The circular saw 11 has a motor (not shown), which rotates a circular saw blade T1. A base 160 with an opening for allowing a portion of the saw blade T1 to protrude downward is provided at the bottom of the main body. A handle 122A is provided at the top, and a trigger 142 is attached to the handle 122A. A battery 158 is detachably attached to the rear lower portion of the handle 122A. When the handle 122A is gripped and the trigger 142 is operated, power is supplied from the battery 158 to rotate the motor, which in turn rotates the saw blade T1. While the saw blade T1 is rotating, the underside of the base 160 is slid over the workpiece, allowing cutting with the saw blade T1 to be performed. A control panel 154 is also provided below the handle 122A.

[0103] FIG. 13 shows the control panel 154. The control panel 154 is provided with a push-button control switch 152, a rotation speed display 154A, and an on-lock display 154B. In the circular saw 11, the target rotation speed of the motor can be changed or selected from three levels by pressing the control switch 152 when the trigger 142 is not being operated (the motor is not driven). One of three LEDs on the rotation speed display 154A lights up to indicate the selected rotation speed. Pressing the control switch 152 while the trigger 142 is being operated (the motor is driven) transitions the motor to the on-lock state, and the circular LED display shown in the upper right corner of the on-lock display lights up to indicate this. In the circular saw 11, changing the rotation speed is prohibited when the motor is driven. If there is a large difference between multiple target rotation speeds, changing the target rotation speed while the motor is driven can cause a backlash, potentially causing the power tool to become unstable. However, the circular saw 11 prevents this from occurring. In this way, a configuration that allows appropriate control to be performed when the motor is not in operation and appropriate control to be performed when the motor is in operation to be performed by operating a similar operating unit (control switch) based on the motor's operating state can be applied to various power tools. [Explanation of symbols]

[0104] 10 Electric trimmer (power tool) 22 Housing 22A cylinder part 34 Motor 34A output shaft 42 Trigger (operation part) 46 Speed ​​setting dial (display) 60 base 70 Lifting mechanism 72 First rack (rack, engagement part) 74 Second rack (rack, engagement part) 82 Pinion (engaged part, rotating member) 170 Rotating member (engaged part) 172 Nut (engagement part) T-tool

Claims

1. A motor; a housing that accommodates the motor; an output shaft driven by the motor; a control unit electrically connected to the motor and controlling the operation of the motor by controlling the power supplied to the motor; an operating unit that is movable between an initial position and an operating position and that can be operated by an operator to drive the motor when operated and to deactivate the motor when the operation is released; a lock button that can be operated by an operator and whose operation can be detected by the control unit; Equipped with The control unit an off-lock release state in which the motor is in the driving state when the operation unit is operated to the operation position; an off-lock state in which the motor is controlled to the non-drive state without being brought into the drive state even when the operation unit is operated to the operation position; an on-lock state in which the motor is in the driving state even when the operation unit is located at the initial position; as control states, and When the lock button is operated in the off-lock state and the operation unit is located at the initial position, the control state transitions to the off-lock release state, When the lock button is operated in the off-lock release state and the operating portion is located at the operating position, the power tool transitions the control state to the on-lock state.

2. The power tool according to claim 1 , wherein the control unit, when in the on-lock state, releases the on-lock state based on an operation on the operating unit.

3. The power tool according to claim 1 , wherein the control unit releases the on-lock state based on an operation on the lock button when the on-lock state is in effect.

4. The power tool according to claim 2 or 3, wherein the control unit transitions to the off-lock release state when the on-lock state is released.

5. The housing is formed with a grip portion that can be gripped by the operator, the operation unit is disposed at an arbitrary position on the grip unit, The power tool according to any one of claims 1 to 4, wherein the lock button is arranged at a position different from the position of the operating part that can be operated by the operator while holding the grip part.

6. The power tool according to claim 5 , wherein the lock button is provided on the opposite side of the grip portion from the operating portion.

7. the operation portion is provided on an upper side of the grip portion, The power tool according to claim 5 or 6, wherein the lock button is located above the operating portion.

8. The housing is configured by combining a first housing and a second housing, The power tool according to claim 6 or 7, wherein the operating portion and the lock button are provided at a mating portion between the first housing and the second housing.

9. The power tool according to claim 1 , further comprising a switch that outputs a detection signal to a control unit every time the lock button is operated.

10. The power tool according to claim 1 , wherein the control unit transitions from the off-lock release state to the off-lock state by operating the lock button.

11. The power tool according to claim 1 , wherein the control unit transitions from the off-lock release state to the off-lock state when no operation of the operation unit or the lock button is detected within a predetermined time.

12. The power tool according to claim 1 , wherein the control unit maintains the off-lock release state even if the operating unit is operated or released after transitioning from the off-lock state to the off-lock release state.

13. a detachable battery for supplying power to the motor; The power tool according to claim 1 , wherein the control unit is placed in the off-lock state when the battery is attached.

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