Portable band saw

Abstract

To prevent the deterioration of the operability of an electric work-machine.SOLUTION: An electric work-machine includes a motor, a housing that houses the motor, an output portion that is driven by the motor, and a switch mechanism that is supported by the housing. The switch mechanism performs main operation of driving the motor and preliminary operation of changing the main operation from a blocked state to an allowed state. The main operation is operation of moving at least a part of the switch mechanism straight from a first straight movement position on a front side of the housing to a second straight movement position on a back side of the housing. An operating direction of the main operation and an operating direction of the preliminary operation intersect each other.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a portable band saw. [Background technology]

[0002] An electric work machine includes a motor and a switch mechanism that is operated to drive or stop the motor. Patent Document 1 discloses an electric tool that includes a trigger switch that switches the motor on or off and a lock-on mechanism that can maintain the motor in the on state. Patent Document 2 discloses an electric tool that includes a switch lever that can move between an on position that starts the power tool and an off position that stops it, a lock-on mechanism that locks the switch lever in the on position, and a lock-off mechanism that locks the switch lever in the off position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-101646 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-158755 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for technology that can prevent a decrease in operability in electric working machines that have a lock-off function.

[0005] The technology disclosed in this specification aims to suppress a decrease in the operability of an electric work machine. [Means for solving the problem]

[0006] This specification discloses an electric working machine. The electric working machine may include a motor, a housing that accommodates the motor, an output unit driven by the motor, and a switch mechanism supported by the housing. The switch mechanism may perform a main operation that drives the motor and an auxiliary operation that changes the main operation from a blocked state to an allowed state. The main operation may be an operation that moves at least a portion of the switch mechanism in a straight line from a first straight-travel position on the front side of the housing to a second straight-travel position on the back side. The operating direction of the main operation and the operating direction of the auxiliary operation may intersect. [Effects of the Invention]

[0007] According to the technology disclosed in this specification, the deterioration of the operability of the electric working machine is suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view from the rear showing an electric operating machine according to a first embodiment. [Figure 2] FIG. 2 is a perspective view from the front showing the electric operating machine according to the first embodiment. [Figure 3] FIG. 3 is a rear view of the electric operating machine according to the first embodiment. [Figure 4] FIG. 4 is a view of the electric operating machine according to the first embodiment as seen from the front. [Figure 5] FIG. 5 is a view of the electric operating machine according to the first embodiment as seen from the left side. [Figure 6] FIG. 6 is a view of the electric operating machine according to the first embodiment as seen from the right side. [Figure 7] FIG. 7 is a view of the electric operating machine according to the first embodiment with the rear cover and the front cover open, as viewed from the right side. [Figure 8] FIG. 8 is a cross-sectional view showing the electric operating machine according to the first embodiment. [Figure 9] FIG. 9 is a perspective view from the front showing the stand switch mechanism according to the first embodiment. [Figure 10]FIG. 10 is an exploded perspective view from the front showing the stand switch mechanism according to the first embodiment. [Figure 11] FIG. 11 is a perspective view showing the stand switch mechanism according to the first embodiment, as seen from the rear side. [Figure 12] FIG. 12 is an exploded perspective view from the rear showing the stand switch mechanism according to the first embodiment. [Figure 13] FIG. 13 is a diagram for explaining the operation of the stand switch mechanism according to the first embodiment. [Figure 14] FIG. 14 is a diagram for explaining the operation of the stand switch mechanism according to the first embodiment. [Figure 15] FIG. 15 is a diagram for explaining the operation of the stand switch mechanism according to the first embodiment. [Figure 16] FIG. 16 is a diagram for explaining the operation of the stand switch mechanism according to the first embodiment. [Figure 17] FIG. 17 is a view for explaining how to use the band saw according to the first embodiment. [Figure 18] FIG. 18 is a diagram for explaining how to use the band saw according to the first embodiment. [Figure 19] FIG. 19 is a perspective view from the front showing the stand switch mechanism according to the second embodiment. [Figure 20] FIG. 20 is an exploded perspective view from the front showing the stand switch mechanism according to the second embodiment. [Figure 21] FIG. 21 is a perspective view showing the stand switch mechanism according to the second embodiment, as seen from the rear side. [Figure 22] FIG. 22 is an exploded perspective view from the rear showing the stand switch mechanism according to the second embodiment. [Figure 23] FIG. 23 is a diagram for explaining the operation of the stand switch mechanism according to the second embodiment. [Figure 24] FIG. 24 is a diagram for explaining the operation of the stand switch mechanism according to the second embodiment. [Figure 25]FIG. 25 is a diagram for explaining the operation of the stand switch mechanism according to the second embodiment. [Figure 26] FIG. 26 is a diagram for explaining the operation of the stand switch mechanism according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, an electric operating machine may include a motor, a housing that accommodates the motor, an output unit driven by the motor, and a switch mechanism supported by the housing. The switch mechanism may perform a main operation that drives the motor and an auxiliary operation that changes the main operation from a blocked state to an allowed state. The main operation may be an operation that moves at least a portion of the switch mechanism in a straight line from a first straight-travel position on the front side of the housing to a second straight-travel position on the back side. The operating direction of the main operation and the operating direction of the auxiliary operation may intersect.

[0010] In the above configuration, the main operation that drives the motor is an operation that moves at least a part of the switch mechanism in a straight line from the first straight-line position to the second straight-line position. The operating direction of the auxiliary operation that changes the main operation from a blocked state to an allowed state intersects with the operating direction of the main operation. Therefore, deterioration in operability of the switch mechanism is suppressed. A user of the electric work machine can easily recognize whether they are performing the main operation or the auxiliary operation based on the difference between the operating direction of the main operation and the operating direction of the auxiliary operation. In addition, the main operation is an operation that moves at least a part of the switch mechanism in a straight line from the first straight-line position on the front side of the housing to the second straight-line position on the back side. Therefore, an increase in the size of the electric work machine is suppressed.

[0011] In one or more embodiments, the switch mechanism may perform a maintenance operation that maintains the main operation in a maintenance state. The operation direction of the main operation and the operation direction of the maintenance operation may intersect.

[0012] In the above configuration, the operating direction of the maintenance operation that maintains the main operation intersects with the operating direction of the main operation. This prevents a decrease in the operability of the switch mechanism. The user of the electric work machine can easily recognize whether they are performing the main operation or the maintenance operation based on the difference between the operating direction of the main operation and the operating direction of the maintenance operation.

[0013] In one or more embodiments, the operating direction of the maintenance operation may be opposite to the operating direction of the preparatory operation.

[0014] With the above configuration, the preliminary operation, main operation, and maintenance operation can be performed smoothly and continuously. Furthermore, since the operation direction of the maintenance operation and the operation direction of the preliminary operation are opposite to each other, the electric operating machine is prevented from becoming large.

[0015] In one or more embodiments, the switch mechanism may have an operating member for performing a preliminary operation. The switch mechanism may have an operating member for performing a maintenance operation. The operating member for performing the preliminary operation and the operating member for performing the maintenance operation may be the same member.

[0016] The above configuration prevents an increase in the number of parts in the switch mechanism and also prevents an increase in the size of the electric operating machine.

[0017] In one or more embodiments, the switch mechanism may have an operating member that performs a primary operation, a backup operation, and a maintenance operation.

[0018] The above configuration prevents an increase in the number of parts in the switch mechanism and also prevents an increase in the size of the electric operating machine.

[0019] In one or more embodiments, the primary operation may be an operation of moving the operating member linearly from a first linear position to a second linear position. The preliminary operation may be an operation of rotating the operating member from a first pivoted position to a second pivoted position. The operating member may be rotated from the first pivoted position to the second pivoted position while being maintained at the first linear position in the linear direction, and then moved linearly to the second linear position.

[0020] With the above configuration, the deterioration of the operability of the switch mechanism is suppressed, and the electric operating machine is prevented from becoming larger.

[0021] In one or more embodiments, the switch mechanism may include a switch case that movably supports the operating member. The switch case may include an engaged portion that engages with an engaging portion provided on the operating member. When the operating member is disposed at a first linear position in the linear direction and at a first rotation position in the rotation direction, the engaging portion may engage with the engaged portion that is located further back than the engaging portion, thereby preventing the main operation. When the operating member is rotated from the first rotation position to the second rotation position, the engaging portion may disengage from the engaged portion, thereby allowing the main operation.

[0022] In the above configuration, when the operating member is disposed in the first straight position and the first rotation position, the engaged portion of the switch case is disposed further back than the engaging portion of the operating member. This blocks the main operation. When the operating member is rotated to the second rotation position, the engaging portion and the engaged portion are disengaged. This allows the main operation.

[0023] In one or more embodiments, the switch mechanism may include a momentary switch disposed behind the operating member. When the primary operation is permitted, the operating member may move linearly to the second linear position, thereby operating the momentary switch. The motor may be driven by driving the momentary switch.

[0024] In the above configuration, a momentary switch is used, making it possible to handle high currents.

[0025] In one or more embodiments, the maintaining operation may be an operation of rotating the operating member from the second pivot position to the first pivot position. After the operating member is rotated from the second pivot position to the first pivot position while being maintained in the second linear position in the linear direction, the operating member may be maintained in the second linear position.

[0026] With the above configuration, the deterioration of the operability of the switch mechanism is suppressed, and the electric operating machine is prevented from becoming larger.

[0027] In one or more embodiments, the operating member may be disposed at the second linear position in the linear direction and at the first rotation position in the rotation direction, thereby engaging the engaging portion with the engaged portion disposed in front of the engaging portion, and the primary operation may be maintained. The operating member may be rotated from the first rotation position to the second rotation position, thereby disengaging the engaging portion from the engaged portion, and the operating member may return from the second linear position to the first linear position in the linear direction due to the elastic force of the momentary switch.

[0028] In the above configuration, when the operating member is disposed in the second straight-travel position and the first rotation position, the engaging portion of the operating member is disposed further back than the engaged portion of the switch case. This maintains the main operation. When the operating member is rotated to the second rotation position, the engaging portion and the engaged portion are disengaged. The momentary switch generates an elastic force that returns the operating member from the second straight-travel position to the first straight-travel position. When the engaging portion and the engaged portion are disengaged, the elastic force of the momentary switch allows the operating member to move from the second straight-travel position to the first straight-travel position. This stops the motor, and the main operation is prevented.

[0029] In one or more embodiments, the operating member may have a plate-shaped portion that is long in a direction perpendicular to the rotation axis of the operating member.

[0030] In the above configuration, a user of the electric operating machine can smoothly rotate the operating member by pinching the plate-shaped portion with his or her fingers.

[0031] In one or more embodiments, the switch mechanism may have a first operating member that performs a main operation and a second operating member that performs a backup operation and a maintenance operation.

[0032] The above configuration prevents an increase in the number of parts of the switch mechanism, prevents the structure of the switch mechanism from becoming complicated, and prevents the electric operating machine from becoming large.

[0033] In one or more embodiments, the primary operation may be an operation of moving the first operating member linearly from the first linear position to the second linear position. The preliminary operation may be an operation of sliding the second operating member from the first sliding position to the second sliding position. The first operating member may be moved linearly to the second linear position after the second operating member is slid from the first sliding position to the second sliding position.

[0034] The above configuration prevents a decrease in operability of the switch mechanism, prevents the structure of the switch mechanism from becoming complicated, and prevents the electric operating machine from becoming large.

[0035] In one or more embodiments, the second operating member may have an engaged portion that engages with an engaging portion provided on the first operating member. When the first operating member is disposed at the first linear position in the linear direction and the second operating member is disposed at the first slide position in the slide direction, the engaging portion may engage with an engaged portion that is disposed further back than the engaging portion, thereby blocking the main operation. When the second operating member slides from the first slide position to the second slide position, the engaging portion may be disengaged from the engaged portion, thereby allowing the main operation.

[0036] In the above configuration, when the first operating member is positioned in the first straight-ahead position and the second operating member is positioned in the first slide position, the engaged portion of the second operating member is positioned further back than the engaging portion of the first operating member. This places the main operation in a blocked state. When the second operating member is slid to the second slide position, the engaging portion and the engaged portion are disengaged. This places the main operation in a permitted state.

[0037] In one or more embodiments, the switch mechanism may include a momentary switch disposed behind the first operating member. When the primary operation is permitted, the first operating member may move straight to the second straight-travel position to operate the momentary switch, thereby driving the motor.

[0038] In the above configuration, a momentary switch is used, making it possible to handle high currents.

[0039] In one or more embodiments, the maintaining operation may be an operation of sliding the second operating member from the second sliding position to the first sliding position. By disposing the first operating member at the second linear position in the linear direction and the second operating member at the first sliding position in the sliding direction, the engaging portion may engage with an engaged portion that is disposed on the proximal side of the engaging portion, thereby maintaining the main operation. By sliding the second operating member from the first sliding position to the second sliding position, the engaging portion may be disengaged from the engaged portion, and the first operating member may be moved from the second linear position to the first linear position in the linear direction.

[0040] In the above configuration, by disposing the first operating member in the second straight-travel position and the second operating member in the first sliding position, the engaging portion of the first operating member is disposed further back than the engaged portion of the second operating member. This maintains the main operation. By sliding the second operating member to the second sliding position, the engaging portion and the engaged portion are disengaged. By disengaging the engaging portion and the engaged portion, the first operating member can move from the second straight-travel position to the first straight-travel position. This stops the motor, and the main operation is prevented.

[0041] In one or more embodiments, the second operating member may have a plate-shaped portion that is long in a direction perpendicular to the sliding direction.

[0042] In the above configuration, a user of the electric operating machine can smoothly slide the second operating member by pinching the plate-shaped portion with his or her fingers.

[0043] In one or more embodiments, the electric work machine may include a battery mounting portion to which a rechargeable battery is attached.

[0044] With the above configuration, there is no need to connect the electric work machine to a commercial power source with a cable, so the electric work machine can be easily transported.

[0045] In one or more embodiments, the electric work machine may include a first saw wheel, a second saw wheel, and a band saw blade attached to each of the first and second saw wheels. The output unit may include the first saw wheel. The housing may include a first housing in which the first saw wheel is housed, a second housing in which the second saw wheel is housed, and a bridge housing disposed between the first and second housings and in which the motor is housed. The switch mechanism may be supported by the second housing.

[0046] In the above configuration, the switch mechanism is provided in a portable band saw as an electric work machine. The band saw may be used while mounted on a stand. By supporting the switch mechanism in the second housing disposed adjacent to the bridge housing, a user of the electric work machine can smoothly operate the switch mechanism while the band saw is mounted on the stand.

[0047] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0048] In this embodiment, a local coordinate system is set in the electric work machine 1, and the positional relationship of each part will be described with reference to the local coordinate system. An XYZ Cartesian coordinate system is set as the local coordinate system. The direction parallel to the X axis within a predetermined plane is defined as the X axis direction. The direction parallel to the Y axis perpendicular to the X axis within the predetermined plane is defined as the Y axis direction. The direction parallel to the Z axis perpendicular to both the X axis and the Y axis is defined as the Z axis direction. The predetermined plane is the XY plane. The Z axis is perpendicular to the predetermined plane. In this embodiment, the predetermined plane is parallel to the horizontal plane. The X axis direction is the front-to-back direction, with the +X side being the front side and the -X side being the rear side. The Y axis direction is the left-to-right direction, with the +Y side being the left side and the -Y side being the right side. The Z axis direction is the up-down direction, with the +Z side being the top side and the -Z side being the bottom side. Furthermore, the direction parallel to each of the first rotation axis CX1 of the rear saw wheel 27 and the second rotation axis CX2 of the front saw wheel 28 (described later) is defined as the MS direction, and the direction perpendicular to each of the MS direction and the front-to-rear direction is defined as the KL direction. The up-down direction is inclined with respect to each of the MS direction and the KL direction. The M side is one side of the MS direction, and the S side is the other side of the MS direction. The K side is one side of the KL direction, and the L side is the other side of the KL direction. The angle formed by the downward direction and the S direction is 55 degrees. The angle formed by the rightward direction and the S direction is 35 degrees.

[0049] [First embodiment] A first embodiment will be described.

[0050] <Electric work equipment> FIG. 1 is a perspective view of the electric working machine 1 according to this embodiment, seen from the rear. FIG. 2 is a perspective view of the electric working machine 1 according to this embodiment, seen from the front. FIG. 3 is a view of the electric working machine 1 according to this embodiment, seen from the rear. FIG. 4 is a view of the electric working machine 1 according to this embodiment, seen from the front. FIG. 5 is a view of the electric working machine 1 according to this embodiment, seen from the left side. FIG. 6 is a view of the electric working machine 1 according to this embodiment, seen from the right side.

[0051] In this embodiment, the electric operating machine 1 is a band saw, which is a type of power tool. In the following description, the electric operating machine 1 will be referred to as the band saw 1 where appropriate.

[0052] The band saw 1 is an electric power tool that cuts an object by rotating a band saw blade 2. In this embodiment, the band saw 1 is a portable band saw. A user of the band saw 1 can carry the band saw 1 with them. A user of the band saw 1 can cut an object while holding the band saw 1 in their hand.

[0053] The band saw 1 includes a housing 3, a main handle 4, and a sub-handle 5.

[0054] The housing 3 is long in the front-rear direction and includes a rear base 6, a front base 7, a rear cover 8, a front cover 9, a left middle cover 10, and a right middle cover 11.

[0055] The rear base 6 is disposed rearward of the front base 7. The rear base 6 has a flat plate shape. The rear base 6 extends in the KL direction from the rear side to the front side. The rear cover 8 is disposed on the lower right side (S direction) of the rear base 6. The rear cover 8 has a flat plate shape. The rear cover 8 extends in the KL direction from the rear side to the front side. The rear base 6 and the rear cover 8 are disposed parallel to each other and overlap each other. The upper right portion of the rear base 6 and the upper right portion of the rear cover 8 are connected via a hinge 12. The rotation axis of the hinge 12 is parallel to the X axis. A rear space is formed between the rear base 6 and the rear cover 8.

[0056] The front base 7 is disposed forward of the rear base 6. The front base 7 has a flat plate shape. The front base 7 extends in the KL direction from the rear side to the front side. The front cover 9 is disposed on the lower right side (S direction) of the front base 7. The front cover 9 has a flat plate shape. The front cover 9 extends in the KL direction from the rear side to the front side. The front base 7 and the front cover 9 are disposed parallel to each other and overlap each other. The upper right portion of the front base 7 and the upper right portion of the front cover 9 are connected via a hinge 13. The rotation axis of the hinge 13 is parallel to the X axis. A front space is formed between the front base 7 and the front cover 9. The hinges 12 and 13 are coaxial.

[0057] The left middle cover 10 is disposed between the upper part (upper left part) of the rear base 6 and the upper part (upper left part) of the front base 7. The rear part of the left middle cover 10 is fixed to the upper part (upper left part) of the rear base 6 with a screw 14. The front part of the left middle cover 10 is fixed to the upper part (upper left part) of the front base 7 with a screw 15.

[0058] The right middle cover 11 is disposed between the upper part of the rear base 6 and the upper part of the front base 7. The rear part of the right middle cover 11 is fixed to the upper part of the rear base 6 with a screw 16. The front part of the right middle cover 11 is fixed to the upper part of the front base 7 with a screw 17.

[0059] The right middle cover 11 is disposed on the right side of the left middle cover 10. The left middle cover 10 and the right middle cover 11 are fixed together with a screw 18. A middle space is formed between the left middle cover 10 and the right middle cover 11.

[0060] The rear base 6 and the front base 7 are each made of a metal, and examples of the metal that forms the rear base 6 and the front base 7 include aluminum and magnesium.

[0061] The rear cover 8 and the front cover 9 are each made of synthetic resin. Examples of synthetic resins that form the rear cover 8 and the front cover 9 include polycarbonate resin and polyamide resin.

[0062] The left middle cover 10 and the right middle cover 11 are each made of synthetic resin. Examples of the synthetic resin that forms the left middle cover 10 and the right middle cover 11 include polycarbonate resin and polyamide resin.

[0063] In the following description, the rear base 6 and rear cover 8 will be collectively referred to as the rear housing 19, the front base 7 and front cover 9 will be collectively referred to as the front housing 20, and the left middle cover 10 and right middle cover 11 will be collectively referred to as the bridge housing 21.

[0064] In the front-to-rear direction, the bridge housing 21 is disposed between the rear housing 19 and the front housing 20. The bridge housing 21 is disposed so as to connect the upper part of the rear housing 19 and the upper part of the front housing 20. An opening 22 is provided between the lower part of the bridge housing 21, the front part of the rear housing 19, and the rear part of the front housing 20.

[0065] The main handle 4 is held by a user of the band saw 1. The main handle 4 is arranged to connect the rear of the bridge housing 21 and the rear of the rear base 6. The main handle 4 has a so-called half-split structure. The main handle 4 includes a left handle member 4A and a right handle member 4B. The left handle member 4A and the right handle member 4B are fixed together with a plurality of screws 4C. A handle space is formed between the left handle member 4A and the right handle member 4B.

[0066] The sub-handle 5 is held by a user of the band saw 1. The sub-handle 5 has a left arm 5A connected to the upper left portion of the front base 7, a right arm 5B connected to the upper right portion of the front base 7, and a grip 5C connecting the left arm 5A and the right arm 5B. The left arm 5A is arranged to extend upward and forward from the upper left portion of the front base 7. The right arm 5B is arranged to extend upward and forward from the upper left portion of the front base 7. The grip 5C is arranged to connect the upper end of the left arm 5A to the upper end of the right arm 5B.

[0067] Fig. 7 is a view of the electric working machine 1 according to this embodiment, viewed from the right side, with the rear cover 8 and the front cover 9 open. Fig. 8 is a cross-sectional view showing the electric working machine 1 according to this embodiment.

[0068] As shown in Figures 1 to 8, the band saw 1 includes a motor 23, a sensor board 24, a fan 25, a battery mounting section 26, a rear saw wheel 27, a front saw wheel 28, a band saw blade 2, a tension adjustment lever 29, a rear guide roller 30, a front guide roller 31, a stopper plate 32, a main switch mechanism 33, a stand switch mechanism 34, a speed change dial 35, a light 36, and a controller 37.

[0069] The motor 23 is the power source of the band saw 1. The motor 23 is housed in the bridge housing 21. That is, the motor 23 is disposed in the middle space, which is the internal space of the bridge housing 21. The motor 23 is disposed at the rear of the middle space. The motor 23 is an inner rotor type brushless motor. The motor 23 has a stator 38, a rotor 39, and a rotor shaft 40.

[0070] The stator 38 includes a stator core, an insulator fixed to the stator core, a plurality of coils attached to the stator core via the insulator, and a busbar unit connecting the plurality of coils. The busbar unit is disposed forward of the stator core.

[0071] The rotor 39 has a rotor core and a plurality of permanent magnets fixed to the rotor core.

[0072] The rotor shaft 40 is disposed inside the rotor core. The rotor core is substantially cylindrical. The rotor shaft 40 is fixed to the rotor core. The front portion of the rotor shaft 40 is disposed forward of the stator 38. The rear portion of the rotor shaft 40 is disposed rearward of the stator 38. The front portion of the rotor shaft 40 is rotatably supported by a bearing 40A. The rear portion of the rotor shaft 40 is rotatably supported by a bearing 40B. Each of the bearings 40A and 40B is supported by the bridge housing 21.

[0073] The rotor 39 and the rotor shaft 40 rotate about a motor rotation axis AX, which is parallel to the X-axis.

[0074] The sensor board 24 detects the position of the rotor 39 in the rotational direction. The sensor board 24 is housed in the bridge housing 21. The sensor board 24 supports a magnetic sensor that detects the permanent magnet of the rotor 39. The magnetic sensor detects the position of the rotor 39 in the rotational direction by detecting the magnetic field of the permanent magnet. The sensor board 24 is disposed forward of the stator core. The sensor board 24 is fixed to the insulator of the stator 38.

[0075] The fan 25 is fixed to the rear of the rotor shaft 40. The fan 25 is disposed between the bearing 40B and the stator core. The fan 25 rotates together with the rotor shaft 40. As the fan 25 rotates, an airflow for cooling the motor 23 and the controller 37 is generated.

[0076] The battery mounting portion 26 is connected to a battery pack 41. The battery pack 41 is mounted to the battery mounting portion 26. The battery mounting portion 26 is disposed on the upper part of the bridge housing 21. The battery pack 41 is a power source for the band saw 1. The battery pack 41 includes a rechargeable battery. The battery pack 41 supplies direct current to the band saw 1.

[0077] The power output from the battery pack 41 is supplied to the bus bar units of the stator 38 via the controller 37. A plurality of power lines are arranged to connect the controller 37 and the bus bar units.

[0078] In addition, a plurality of signal lines are arranged to connect the sensor board 24 and the controller 37.

[0079] The rear saw wheel 27 is housed in the rear housing 19. That is, the rear saw wheel 27 is disposed in the rear space, which is the internal space of the rear housing 19. A portion of the rear saw wheel 27 is exposed through an opening 8A provided in the rear cover 8. The rear saw wheel 27 is rotatably supported on the rear base 6. The rear saw wheel 27 rotates about a first rotation axis CX1. The first rotation axis CX1 is parallel to the YZ plane. The first rotation axis CX1 is inclined upward toward the left. The first rotation axis CX1 is inclined at an angle of 55 degrees relative to the downward direction.

[0080] The front saw wheel 28 is housed in the front housing 20. That is, the front saw wheel 28 is disposed in a front space, which is the internal space of the front housing 20. A portion of the front saw wheel 28 is exposed through an opening 9A provided in the front cover 9. The front saw wheel 28 is rotatably supported by the front base 7. The front saw wheel 28 rotates about a second rotation axis CX2. The first rotation axis CX1 and the second rotation axis CX2 are parallel to each other. The second rotation axis CX2 is inclined at an angle of 55 degrees relative to the downward direction.

[0081] The band saw blade 2 is hung on each of the rear saw wheel 27 and the front saw wheel 28. The band saw blade 2 is annular. The band saw blade 2 is pulled in the front-to-rear direction by the rear saw wheel 27 and the front saw wheel 28. At least a portion of the band saw blade 2 is positioned in the opening 22. The left surface of the band saw blade 2 and the right surface of the band saw blade 2 are parallel in areas other than the opening 22. The left surface of the band saw blade 2 and the XZ plane are parallel in the area of the opening 22. In other words, the band saw blade 2 is twisted so that it changes from a position parallel to the right surface of the band saw blade 2 to a position parallel to the XZ plane near the boundary of the opening 22. The twist angle of the band saw blade 2 is 55 degrees.

[0082] As shown in FIG. 7 , an opening 6A is provided on the right side of the rear base 6. The opening 6A of the rear base 6 is covered by a rear cover 8. The rear cover 8 opens and closes the opening 6A of the rear base 6. An opening 7A is provided on the right side of the front base 7. The opening 7A of the front base 7 is covered by a front cover 9. The front cover 9 opens and closes the opening 7A of the front base 7. When replacing the band saw blade 2, both the opening 6A and the opening 7A are opened.

[0083] The rotor shaft 40 is connected to the rear saw wheel 27 via a power transmission mechanism 42. The power transmission mechanism 42 includes a bevel gear. The rotational force of the rotor shaft 40 is transmitted to the rear saw wheel 27 via the power transmission mechanism 42. When the rotor shaft 40 rotates, the rear saw wheel 27 rotates.

[0084] The rear saw wheel 27 is an output part driven by the motor 23. The rear saw wheel 27 functions as a drive wheel. The front saw wheel 28 functions as a driven wheel. When the rear saw wheel 27 rotates about the first rotation axis CX1 by the motor 23, the band saw blade 2 rotates while being supported by both the rear saw wheel 27 and the front saw wheel 28. The front saw wheel 28, with the band saw blade 2 hung on it, rotates about the second rotation axis CX2 following the rotation of the rear saw wheel 27.

[0085] The tension adjustment lever 29 is operated to adjust the tension of the band saw blade 2. The tension adjustment lever 29 is connected to the front saw wheel 28. By operating the tension adjustment lever 29, the front saw wheel 28 moves in the front-to-rear direction. By moving the front saw wheel 28 in the front-to-rear direction, the tension of the band saw blade 2 is adjusted.

[0086] The rear guide rollers 30 guide the band saw blade 2. The rear guide rollers 30 are arranged at the front of the rear base 6 facing the opening 22. A pair of rear guide rollers 30 are provided to sandwich the band saw blade 2 from the left and right directions. The rotation axis of the rear guide rollers 30 is parallel to the Z axis.

[0087] The front guide roller 31 guides the band saw blade 2. The front guide roller 31 is disposed at the rear of the front base 7 facing the opening 22. A pair of front guide rollers 31 are provided to sandwich the band saw blade 2 from the left and right directions. The rotation axis of the front guide roller 31 is parallel to the Z axis.

[0088] The stopper plate 32 supports the object to be cut. The stopper plate 32 is supported on the front part of the rear base 6. The band saw blade 2 rotates so as to move from the front base 7 to the rear base 6 at the opening 22. The stopper plate 32 prevents the object to be cut from moving due to the rotation of the band saw blade 2. The stopper plate 32 has a through hole 32A that is long in the vertical direction. The stopper plate 32 is fixed to the rear base 6 by a screw 43 that is inserted into the through hole 32A.

[0089] The main switch mechanism 33 is operated to drive or stop the motor 23. The main switch mechanism 33 is disposed in the main handle 4. At least a portion of the main switch mechanism 33 is disposed in the handle space, which is the internal space of the main handle 4.

[0090] The main switch mechanism 33 has a trigger operating member 44 , a lock-off operating member 45 , a lock-on operating member 46 , and a switch 47 .

[0091] The trigger operating member 44 is operated to drive the motor 23. The trigger operating member 44 is arranged in the upper part of the main handle 4. The main handle 4 has an opening 4D in which the trigger operating member 44 is arranged. The opening 4D is arranged on the underside of the upper part of the main handle 4. The switch 47 is arranged in the handle space. The switch 47 is operated by pulling the trigger operating member 44 into the handle space. Operating the switch 47 drives the motor 23.

[0092] The lock-off operating member 45 is operated to change the operation of the trigger operating member 44 from a blocked state to a permitted state. The lock-off operating member 45 is located on the top of the main handle 4. The main handle 4 has an opening 4E in which the lock-off operating member 45 is located. The openings 4E are located on both the left and right surfaces of the top of the main handle 4. By pushing the lock-off operating member 45 into the handle space, the operation of the trigger operating member 44 changes from a blocked state to a permitted state.

[0093] When the lock-off operation member 45 is not operated, operation of the trigger operation member 44 is prevented. If the user of the band saw 1 does not operate the lock-off operation member 45, he or she cannot operate the trigger operation member 44. When the lock-off operation member 45 is pushed into the handle space, the blocked state is released and operation of the trigger operation member 44 is permitted. By pushing the lock-off operation member 45, the user of the band saw 1 can pull the trigger operation member 44.

[0094] The lock-on operation member 46 is operated to maintain the pulled state of the trigger operation member 44. The lock-on operation member 46 is located at the top of the main handle 4. The main handle 4 has an opening 4F in which the lock-on operation member 46 is located. The opening 4F is located on the left surface of the top of the main handle 4. After the trigger operation member 44 is pulled, the lock-on operation member 46 is pushed into the handle space, thereby maintaining the pulled state of the trigger operation member 44.

[0095] If the trigger operating member 44 is pulled and then the lock-on operating member 46 is pushed into the handle space, the trigger operating member 44 remains pulled. If the lock-on operating member 46 is pushed after the trigger operating member 44 is pulled, the motor 23 enters a locked-on state and can continue to operate, even if the trigger operating member 44 is released from the pulled state. After pulling the trigger operating member 44 with a finger, the user of the band saw 1 can push the lock-on operating member 46, allowing the motor 23 to continue to operate even if the user releases his or her finger from the trigger operating member 44.

[0096] That is, the state before the trigger operating member 44 is pulled is an OFF state in which the motor 23 is stopped. The state before the lock-off operating member 45 is pushed is a blocked state in which the trigger operating member 44 is blocked from being pulled. The blocked state in which the trigger operating member 44 is blocked from being pulled is a locked-off state in which the motor 23 is fixed to be OFF. The state after the lock-off operating member 45 is pushed is a permitted state in which the trigger operating member 44 is allowed to be pulled. The state after the lock-off operating member 45 is pushed and the trigger operating member 44 is pulled is an ON state in which the motor 23 is driven. The state after the trigger operating member 44 is pulled and the lock-on operating member 46 is pushed is a maintained state in which the pulled state of the trigger operating member 44 is maintained. The maintained state in which the pulled state of the trigger operating member 44 is maintained is a locked-on state in which the ON state of the motor 23 is fixed. In the locked-on state, after the fingers are released from the trigger operating member 44 and the lock-on operating member 46, the trigger operating member 44 is pulled again, thereby releasing the locked-on state.

[0097] The stand switch mechanism 34 is operated to drive or stop the motor 23. The stand switch mechanism 34 is supported on the upper part of the front housing 20. The stand switch mechanism 34 is disposed on the front side of the bridge housing 21. At least a portion of the stand switch mechanism 34 is disposed in a recess 20A formed in the upper part of the front housing 20. At least a portion of the stand switch mechanism 34 is disposed between the left arm portion 5A and the right arm portion 5B of the sub-handle 5.

[0098] The speed change dial 35 is operated to adjust the rotation speed of the motor 23. The speed change dial 35 is disposed on the upper part of the main handle 4.

[0099] The light 36 illuminates the cutting target and is located at the bottom of the front of the bridge housing 21.

[0100] The controller 37 controls at least the motor 23. The controller 37 controls the drive current supplied to the motor 23 based on the detection signal of the magnetic sensor mounted on the sensor board 24. The controller 37 includes a printed circuit board 37A and multiple electronic components mounted on the printed circuit board. The printed circuit board 37A is supported by a controller case 37B. The controller case 37B is vessel-shaped with a shallow recess, and the recess and its outer casing are rectangular when viewed from the direction of the recess. A printed circuit board 37A, which is also rectangular and has a substantially identical shape, is inserted into the recess. Here, the bottom surface of the controller case 37B is referred to as the controller case front surface 37E, the surface opposite the controller case front surface 37E as the controller case back surface 37F, the side from which the lead wires (not shown) of the printed circuit board 37A extend as the board back surface 37D, and the surface opposite the board back surface 37D as the printed circuit board 37C.

[0101] The controller 37 is accommodated in the bridge housing 21. That is, the controller 37 is disposed in a middle space, which is the internal space of the bridge housing 21. The controller 37 is disposed in the upper part of the middle space. At least a portion of the controller 37 is disposed above the motor 23. In the XY plane, the motor 23 and at least a portion of the controller 37 overlap. The controller 37 is disposed behind the stand switch mechanism 34.

[0102] The controller 37 controls the motor 23 based on an operation signal from at least one of the main switch mechanism 33 and the stand switch mechanism 34. The electronic devices of the main switch mechanism 33 and the stand switch mechanism 34 are connected in series.

[0103] When the motor 23 is started or stopped by operating the main switch mechanism 33, the stand switch mechanism 34 is locked on. With the stand switch mechanism 34 in the locked on state, the user of the band saw 1 can start or stop the motor 23 by operating the main switch mechanism 33.

[0104] When the stand switch mechanism 34 is operated to start or stop the motor 23, the main switch mechanism 33 is locked on. With the main switch mechanism 33 locked on, the user of the band saw 1 can start or stop the motor by operating the stand switch mechanism 34.

[0105] <Stand switch mechanism> Fig. 9 is a perspective view from the front side showing the stand switch mechanism 34 according to this embodiment. Fig. 10 is an exploded perspective view from the front side showing the stand switch mechanism 34 according to this embodiment. Fig. 11 is a perspective view from the rear side showing the stand switch mechanism 34 according to this embodiment. Fig. 12 is an exploded perspective view from the rear side showing the stand switch mechanism 34 according to this embodiment.

[0106] The stand switch mechanism 34 includes an operating member 50 , a switch case 51 , a sleeve 52 , a coil spring 53 , a momentary switch 54 , and a switch circuit 55 .

[0107] The operating member 50 has a large diameter portion 56 , a small diameter portion 57 , a switch portion 58 , and a plate-shaped portion 59 .

[0108] The outer shape of the large diameter portion 56 is substantially cylindrical. The outer shape of the small diameter portion 57 is substantially cylindrical. The small diameter portion 57 is connected to the rear portion of the large diameter portion 56. The outer diameter of the large diameter portion 56 is larger than the outer diameter of the small diameter portion 57. The central axis of the large diameter portion 56 and the central axis of the small diameter portion 57 coincide with each other. In the following description, the central axis of the large diameter portion 56 and the central axis of the small diameter portion 57 will be collectively referred to as the central axis MX of the operating member 50, as appropriate. The central axis MX is parallel to the X-axis.

[0109] The switch portion 58 is connected to the rear of the small diameter portion 57. The outer shape of the switch portion 58 is elongated in a direction perpendicular to the central axis MX of the operating member 50. In Figures 10 and 12, the switch portion 58 extends in the left-right direction. The left-right dimension of the switch portion 58 is larger than the outer diameter of the small diameter portion 57.

[0110] The switch unit 58 has an engagement portion 60. The engagement portion 60 includes a first rectilinear engagement portion 61, a second rectilinear engagement portion 62, a first rotational engagement portion 63, and a second rotational engagement portion 64. The first rectilinear engagement portion 61 includes the upper left corner of the switch unit 58. The second rectilinear engagement portion 62 includes the lower right corner of the switch unit 58. The first rotational engagement portion 63 includes the lower left corner of the switch unit 58. The second rotational engagement portion 64 includes the upper right corner of the switch unit 58. The first rectilinear engagement portion 61 and the second rectilinear engagement portion 62 are arranged on a first diagonal line of the switch unit 58 that passes through the central axis MX. The first rotational engagement portion 63 and the second rotational engagement portion 64 are arranged on a second diagonal line of the switch unit 58 that passes through the central axis MX.

[0111] The plate-shaped portion 59 is connected to the front portion of the large diameter portion 56. The outer shape of the plate-shaped portion 59 is elongated in a direction perpendicular to the central axis MX of the operating member 50. In Figures 9 to 12, the plate-shaped portion 59 extends in the vertical direction. The vertical dimension of the plate-shaped portion 59 is larger than the outer diameter of the large diameter portion.

[0112] The switch case 51 movably supports the operating member 50. The switch case 51 has an internal space in which at least a portion of the operating member 50 is disposed. The switch case 51 has a so-called half-split structure. The switch case 51 includes a left switch case 51A and a right switch case 51B. The left switch case 51A and the right switch case 51B are fixed together with a plurality of screws. An internal space of the switch case 51 is formed between the left switch case 51A and the right switch case 51B.

[0113] The switch case 51 is supported on the upper part of the front housing 20. The switch case 51 is disposed in a recess 20A formed in the upper part of the front housing 20. The switch case 51 is disposed on the front side of the bridge housing 21.

[0114] A support hole 65 is provided on the front side of the switch case 51. The support hole 65 is provided to connect the external space and the internal space of the switch case 51. The large diameter portion 56 is disposed in the support hole 65. The support hole 65 movably supports the large diameter portion 56. With the large diameter portion 56 supported in the support hole 65, the operating member 50 is movable in both the front-rear direction and in the rotation direction about the central axis MX. The central axis MX of the operating member 50 and the rotation axis of the operating member 50 coincide with each other.

[0115] The small diameter portion 57 and the switch portion 58 are each disposed in the internal space of the switch case 51. The plate-shaped portion 59 is disposed in the external space of the switch case 51.

[0116] The switch case 51 has an engaged portion 70 that engages with the engaging portion 60 provided on the operating member 50. The engaged portion 70 includes a first rectilinear engaged portion 71 that engages with the first rectilinear engaging portion 61, a second rectilinear engaged portion 72 that engages with the second rectilinear engaging portion 62, a first rotational engaged portion 73 that engages with the first rotational engaging portion 63, and a second rotational engaged portion 74 that engages with the second rotational engaging portion 64.

[0117] The switch case 51 has a first rib portion 81, a second rib portion 82, a third rib portion 83, and a fourth rib portion 84. The first rib portion 81, the second rib portion 82, the third rib portion 83, and the fourth rib portion 84 are each disposed in the internal space of the switch case 51.

[0118] The left switch case 51A has a right inner surface facing right. The right switch case 51B has a left inner surface facing left. The first rib portion 81 is provided so as to protrude to the right from the right inner surface of the left switch case 51A. The second rib portion 82 is provided so as to protrude to the left from the left inner surface of the right switch case 51B. The third rib portion 83 is provided so as to protrude to the right from the right inner surface of the left switch case 51A. The fourth rib portion 84 is provided so as to protrude to the left from the left inner surface of the right switch case 51B.

[0119] The first rib portion 81 is disposed above the third rib portion 83. The second rib portion 82 is disposed below the fourth rib portion 84. In the vertical direction, the first rib portion 81 is disposed between the fourth rib portion 84 and the second rib portion 82. In the vertical direction, the second rib portion 82 is disposed between the first rib portion 81 and the third rib portion 83.

[0120] The first rib portion 81 includes a first rectilinear engaged portion 71. The second rib portion 82 includes a second rectilinear engaged portion 72. The third rib portion 83 includes a first rotational engaged portion 73. The fourth rib portion 84 includes a second rotational engaged portion 74.

[0121] An inclined surface 71A is provided at the right end of the first rib portion 81. The inclined surface 71A slopes downward and to the left. An inclined surface 72A is provided at the left end of the second rib portion 82. The inclined surface 72A slopes upward and to the right.

[0122] The sleeve 52 is disposed between the outer surface of the large diameter portion 56 and the inner surface of the support hole 65. The support hole 65 movably supports the large diameter portion 56 via the sleeve 52. The sleeve 52 is made of metal. The switch case 51 has a front ring portion 75 that contacts the front end surface of the sleeve 52, and a rear ring portion 76 that contacts the rear end surface of the sleeve 52. The front ring portion 75 and the rear ring portion 76 position the switch case 51 and the sleeve 52 in the front-to-rear direction. The sleeve 52 is disposed so as to rotate freely relative to the support hole 65. The frictional force between the outer surface of the large diameter portion 56 and the inner surface of the sleeve 52 is small. The sleeve 52 allows the large diameter portion 56 to move smoothly.

[0123] The coil spring 53 is disposed in the internal space of the switch case 51. One end of the coil spring 53 is hooked on a hook portion 66 provided on the rear surface of the large diameter portion 56. The other end of the coil spring 53 is hooked on a hook portion 77 provided on the inner surface of the switch case 51. The coil spring 53 applies a biasing force to the operating member 50 so that the operating member 50 rotates in a specified rotation direction.

[0124] The momentary switch 54 is disposed in the internal space of the switch case 51. The momentary switch 54 is disposed rearward of the operating member 50. The momentary switch 54 is connected to a switch circuit 55. The motor 23 is driven by operating the momentary switch 54 via the operating member 50. The motor 23 is driven only while the momentary switch 54 is being pressed by the operating member 50.

[0125] The operating member 50 performs a main operation, an auxiliary operation, and a maintenance operation. The main operation is an operation for driving the motor 23. The auxiliary operation is an operation for changing the main operation from a blocked state to an allowed state. The maintenance operation is an operation for changing the main operation to a maintained state.

[0126] The state before the main operation is performed is an off state in which the motor 23 is stopped. The state before the auxiliary operation is performed is a blocked state in which the main operation is blocked. The blocked state in which the main operation is blocked is a locked-off state in which the off state of the motor 23 is fixed. The state after the auxiliary operation is performed and before the main operation is performed is an allowed state in which the main operation is permitted. The allowed state in which the main operation is permitted is a locked-off released state in which the locked-off state of the motor 23 is released. The state after the auxiliary operation is performed and the main operation is performed is an on state in which the motor 23 is driven. The state after the main operation is performed and the maintaining operation is a maintained state in which the main operation is maintained. The maintaining state in which the main operation is maintained is a locked-on state in which the on state of the motor 23 is fixed.

[0127] The operating direction of the primary operation is the front-to-rear direction. The operating member 50 can move straight in the front-to-rear direction. By performing the primary operation of the operating member 50, the operating member 50 can move in the front-to-rear direction. In this embodiment, the primary operation is an operation of moving the operating member 50 straight from a first straight-movement position G1 on the near side of the front housing 20 to a second straight-movement position G2 on the far side. The stand switch mechanism 34 is disposed on the front side of the bridge housing 21. The near side of the bridge housing 21 is the front side. The far side of the bridge housing 21 is the rear side. The first straight-movement position G1 is defined forward of the second straight-movement position G2. The operation of moving the operating member 50 straight from the first straight-movement position G1 to the second straight-movement position G2 includes an operation of pushing the operating member 50 rearward so that the operating member 50 enters the internal space of the switch case 51. The operation of pushing the operating member 50 rearward includes an operation of pushing the operating member 50 so that the operating member 50 approaches the bridge housing 21. The momentary switch 54 is disposed further back than the operating member 50. When the operating member 50 is pushed back, the momentary switch 54 is pressed and operated.

[0128] The operating direction of the preliminary operation intersects with the operating direction of the main operation. In this embodiment, the operating direction of the preliminary operation is a rotation direction about the central axis MX. The central axis MX is parallel to the X-axis. The central axis MX of the operating member 50 and the rotation axis of the operating member 50 coincide with each other. The operating member 50 can rotate about the central axis MX. When the operating member 50 is subjected to a preliminary operation, the operating member 50 can rotate about the central axis MX. In this embodiment, the preliminary operation is an operation of rotating the operating member 50 from the first rotation position R1 to the second rotation position R2.

[0129] The operation direction of the maintenance operation intersects with the operation direction of the main operation. In this embodiment, the operation direction of the maintenance operation is a rotation direction around the central axis MX. By performing a maintenance operation on the operating member 50, the operating member 50 can rotate around the central axis MX. In this embodiment, the operation direction of the maintenance operation is the opposite direction to the operation direction of the auxiliary operation. The maintenance operation is an operation of rotating the operating member 50 from the second rotation position R2 to the first rotation position R1.

[0130] <Operation of the stand switch mechanism> Next, the operation of the stand switch mechanism 34 will be described. FIGS. 13, 14, 15, and 16 are diagrams for explaining the operation of the stand switch mechanism 34 according to this embodiment. FIGS. 13 to 16 are transition diagrams showing the operation of the stand switch mechanism 34, which changes the motor 23 from a lock-off state (blocked state) to a lock-off release state (permitted state), and then to a lock-on state (maintained state) via an on state. FIG. 13 is a view of the stand switch mechanism 34 as seen from the right side. FIG. 14 is a view of the stand switch mechanism 34 as seen from the front side. FIG. 15 is a cross-sectional view taken along line AA in FIG. 13. FIG. 16 is a side cross-sectional view of FIG. 13.

[0131] As described above, the operating member 50 is movably supported by the switch case 51. The operating member 50 moves straight in the front-rear direction and rotates around the central axis MX. Hereinafter, the front-rear direction will be referred to as the straight direction, and the rotation direction around the central axis MX will be referred to as the rotation direction. Furthermore, the front side will be referred to as the near side, and the rear side will be referred to as the far side.

[0132] 13 to 16, in the unlocked state (blocked state), the operating member 50 is disposed at a first linear position G1 in the linear direction and at a first rotational position R1 in the rotational direction. When the operating member 50 is disposed at the first linear position G1 and at the first rotational position R1, the first linear engaging portion 61 and the first linear engaged portion 71 face each other, and the second linear engaging portion 62 and the second linear engaged portion 72 face each other. The first linear engaging portion 71 is disposed further back than the first linear engaging portion 61, and the second linear engaged portion 72 is disposed further back than the second linear engaging portion 62.

[0133] When the operating member 50 is disposed at the first linear position G1 and the first rotational position R1, the first linear engagement portion 61 engages with the first linear engaged portion 71 disposed further rearward than the first linear engagement portion 61, and the second linear engagement portion 62 engages with the second linear engaged portion 72 disposed further rearward than the second linear engagement portion 62. Because the first linear engagement portion 61 contacts the front surface of the first linear engaged portion 71 and the second linear engagement portion 62 contacts the front surface of the second linear engaged portion 72, the operating member 50 cannot move from the first linear position G1 to the second linear position G2. This prevents the main operation from being blocked, and the motor 23 enters a locked-off state.

[0134] When the operating member 50 is positioned at the first rotation position R1, the first rotation engaging portion 63 and the first rotation engaged portion 73 are separated, and the second rotation engaging portion 64 and the second rotation engaged portion 74 are separated.

[0135] To change from the unlocked state (blocked state) to the unlocked state (permitted state), the operating member 50 is rotated from the first rotation position R1 to the second rotation position R2 while being maintained at the first rectilinear position G1 in the rectilinear direction. By rotating the operating member 50 from the first rotation position R1 to the second rotation position R2, the first rectilinear engaging portion 61 and the first rectilinear engaged portion 71 are disengaged, and the second rectilinear engaging portion 62 and the second rectilinear engaged portion 72 are disengaged. Because the first rectilinear engaging portion 61 moves away from the first rectilinear engaged portion 71 and the second rectilinear engaging portion 62 moves away from the second rectilinear engaged portion 72, the operating member 50 can move from the first rectilinear position G1 to the second rectilinear position G2. This places the main operation in the permitted state, and the motor 23 in the unlocked state.

[0136] In this embodiment, the second rotation position R2 is a position where the first rotation engaging portion 63 and the first rotation engaged portion 73 come into contact, and the second rotation engaging portion 64 and the second rotation engaged portion 74 come into contact. When the operating member 50 is disposed in the second rotation position R2, the first rotation engaging portion 63 and the first rotation engaged portion 73 come into contact, and the second rotation engaging portion 64 and the second rotation engaged portion 74 come into contact. The first rotation engaged portion 73 and the second rotation engaged portion 74 define the rotation range of the operating member 50. The first rotation engaged portion 73 and the second rotation engaged portion 74 function as stoppers that prevent the operating member 50 from rotating excessively. The first rotation engaged portion 73 and the second rotation engaged portion 74 prevent the operating member 50 from rotating excessively.

[0137] In this embodiment, an inclined surface 71A is provided on the right end of the first rectilinearly-moving engaged portion 71, and an inclined surface 72A is provided on the left end of the second rectilinearly-moving engaged portion 72. Therefore, by simply rotating the operating member 50 slightly, the engagement between the first rectilinearly-moving engaging portion 61 and the first rectilinearly-moving engaged portion 71 is released, and the engagement between the second rectilinearly-moving engaging portion 62 and the second rectilinearly-moving engaged portion 72 is released.

[0138] When the operating member 50 is changed from the unlocked state (permitted state) to the ON state after being rotated from the first rotation position R1 to the second rotation position R2, the operating member 50 moves linearly from the first straight-travel position G1 to the second straight-travel position G2 while being maintained at the second rotation position R2 in the rotation direction. When the operating member 50 moves linearly from the first straight-travel position G1 to the second straight-travel position G2, the momentary switch 54 is pressed by the switch unit 58 of the operating member 50. When the main operation is in the permitted state, when the operating member 50 moves linearly to the second straight-travel position G2 and the momentary switch 54 is pressed, the motor 23 is driven and the motor 23 is turned ON.

[0139] When the operating member 50 is changed from the on state to the locked-on state (maintenance state) after moving straight from the first straight-movement position G1 to the second straight-movement position G2, the operating member 50 is rotated from the second rotation position R2 to the first rotation position R1 while being maintained at the second straight-movement position G2 in the straight-movement direction. When the operating member 50 is disposed at the second straight-movement position G2 in the straight-movement direction and at the first rotation position R1 in the rotation direction, the first straight-movement engaging portion 61 and the first straight-movement engaged portion 71 face each other, and the second straight-movement engaging portion 62 and the second straight-movement engaged portion 72 face each other. The first straight-movement engaged portion 71 is disposed closer to the front than the first straight-movement engaging portion 61, and the second straight-movement engaged portion 72 is disposed closer to the front than the second straight-movement engaging portion 62.

[0140] In this embodiment, the coil spring 53 applies a biasing force to the operating member 50 so that the operating member 50 rotates from the second rotation position R2 to the first rotation position R1. This allows the operating member 50 to rotate smoothly from the second rotation position R2 to the first rotation position R1.

[0141] When the operating member 50 is positioned at the second rectilinear position G2 and the first rotational position R1, the first rectilinear engagement portion 61 engages with the first rectilinear engaged portion 71, which is positioned closer to the user than the first rectilinear engagement portion 61, and the second rectilinear engagement portion 62 engages with the second rectilinear engaged portion 72, which is positioned closer to the user than the second rectilinear engagement portion 62. Because the first rectilinear engagement portion 61 contacts the rear surface of the first rectilinear engaged portion 71 and the second rectilinear engagement portion 62 contacts the rear surface of the second rectilinear engaged portion 72, the operating member 50 cannot move from the second rectilinear position G2 to the first rectilinear position G1. After the operating member 50 is rotated from the second rotational position R2 to the first rotational position R1 while maintained at the second rectilinear position G2 in the rectilinear direction, the operating member 50 remains in the second rectilinear position G2. This maintains the primary operation, and the motor 23 enters a locked-on state.

[0142] To change from the locked-on state (maintained state) to the unlocked state (blocked state), the operating member 50 is rotated from the first rotation position R1 to the second rotation position R2. By rotating the operating member 50 from the first rotation position R1 to the second rotation position R2, the first rectilinear engaging portion 61 and the first rectilinear engaged portion 71 are disengaged, and the second rectilinear engaging portion 62 and the second rectilinear engaged portion 72 are disengaged. The momentary switch 54 generates an elastic force that moves the operating member 50 toward the user. In other words, the momentary switch 54 applies an urging force to the operating member 50 so that the operating member 50 returns from the second rectilinear position G2 to the first rectilinear position G1. Therefore, the engagement between the first rectilinear engaging portion 61 and the first rectilinear engaged portion 71 is released, and the engagement between the second rectilinear engaging portion 62 and the second rectilinear engaged portion 72 is released, so that the operating member 50 can return from the second rectilinear position G2 to the first rectilinear position G1 in the rectilinear direction due to the elastic force of the momentary switch 54. In addition, the coil spring 53 applies a biasing force to the operating member 50 so that the operating member 50 rotates from the second rotation position R2 to the first rotation position R1. As a result, the operating member 50 is disposed at the first rectilinear position G1 in the rectilinear direction and at the first rotation position R1 in the rotation direction. As a result, the main operation is permitted, and the motor 23 is placed in the lock-off released state.

[0143] <How to use electric work equipment> Next, we will explain how to use the band saw 1. In normal cutting, the user supports the weight of the band saw 1 by holding the main handle 4 of the band saw 1 with their dominant hand and the sub-handle 5 with their other hand. By moving the band saw 1 in this state, they can cut an object fixed in a desired position. In addition, the chop saw mode and contour mode will be explained below.

[0144] Figure 17 is a diagram illustrating how to use the band saw 1 according to this embodiment. Figure 17 shows an example of using the band saw 1 in a so-called chop saw mode. In the chop saw mode, the band saw 1 is used while attached to a stand 90. The chop saw mode is also sometimes called a cut-off mode.

[0145] The stand 90 includes a base 91, a vise 92, and a support member 93. The vise 92 is supported by the base 91. The vise 92 secures the object to be cut. The vise 92 includes a fixed vise 92A fixed to the base 91, a movable vise 92B facing the fixed vise 92A, a screw 92C for moving the movable vise 92B, a support member 92D for rotatably supporting the screw 92C, and a knob 92E fixed to the end of the screw 92C. The fixed vise 92A is sometimes referred to as a fence.

[0146] The support member 93 supports the band saw 1. The support member 93 is connected to the base 91 via a hinge 94. The band saw 1 is fixed to the support member 93 with screws. The band saw 1 is fixed to the support member 93 so that the stand switch mechanism 34 faces upward. The band saw 1 is connected to the stand 90 so that it can swing about the hinge 94 from a substantially vertical position (top dead center) to a substantially horizontal position (bottom dead center).

[0147] When cutting an object, the user of the band saw 1 places the object between the fixed vice 92A and the movable vice 92B, and then rotates the screw 92C so that the movable vice 92B approaches the fixed vice 92A. The user of the band saw 1 grips the knob 92E and rotates the screw 92C together with the knob 92E, thereby moving the movable vice 92B toward the fixed vice 92A. The object is clamped between the fixed vice 92A and the movable vice 92B. This fixes the object to be cut in the vice 92.

[0148] After the workpiece is secured in the vise 92, the user of the band saw 1 operates the stand switch mechanism 34 to drive the motor 23. Driving the motor 23 rotates the band saw blade 2. While the band saw blade 2 is rotating, the user of the band saw 1, for example, while holding the sub-handle 5, swings the support member 93 from the top dead center in the direction indicated by arrow B. That is, the user of the band saw 1 swings the band saw 1 so that the band saw blade 2 approaches the workpiece. The rotating band saw blade 2 comes into contact with the workpiece secured in the vise 92, cutting the workpiece. Typically, the user releases the sub-handle 5 the moment the rotating band saw blade 2 comes into contact with the workpiece. Thereafter, the weight of the band saw 1 continues the cutting operation (lowering of the band saw 1). After the workpiece is cut (after swinging to the bottom dead center), the user of the band saw 1 operates the stand switch mechanism 34 to stop the motor 23.

[0149] Figure 18 is a diagram for explaining how to use the band saw 1 according to this embodiment. Figure 18 shows an example of using the band saw 1 in a so-called contour mode. Even in the contour mode, the band saw 1 is used while attached to the stand 90.

[0150] The stand 90 includes a base 91, a vise 92, a support member 93, and a contour table 95. In the contour mode, the vise 92 fixes at least a portion of the contour table 95.

[0151] The band saw 1 is fixed to the support member 93 in a substantially vertical position with the stand switch mechanism 34 facing upward. In the contour mode, the hinge 94 is fixed by a stopper bolt to prevent the support member 93 from swinging.

[0152] When cutting an object, the user of the band saw 1 places the object on the contour table 95 and then operates the stand switch mechanism 34 to drive the motor 23. When the motor 23 is driven, the band saw blade 2 rotates. While the band saw blade 2 is rotating, the user of the band saw 1 brings the object placed on the contour table 95 closer to the band saw blade 2. When the object comes into contact with the rotating band saw blade 2, the object is cut. After the object has been cut, the user of the band saw 1 operates the stand switch mechanism 34 to stop the motor 23.

[0153] <Effects> As described above, in this embodiment, the band saw 1 includes the motor 23, the housing 3 that houses the motor 23, the rear saw wheel 27 that is an output unit driven by the motor 23, and the stand switch mechanism 34 that is supported by the housing 3. The stand switch mechanism 34 performs a main operation that drives the motor 23 and a preliminary operation that changes the main operation from a blocked state to an allowed state. The main operation is an operation that moves at least a portion of the stand switch mechanism 34 in a straight line from a first straight-line position G1 on the front side of the housing 3 to a second straight-line position G2 on the rear side. The operating direction of the main operation and the operating direction of the preliminary operation intersect.

[0154] In the above configuration, the main operation that drives the motor 23 is an operation that moves at least a portion of the stand switch mechanism 34 linearly from the first linear position G1 to the second linear position G2. The operating direction of the preliminary operation that changes the main operation from a blocked state to an allowed state intersects with the operating direction of the main operation. This prevents a decrease in the operability of the stand switch mechanism 34. The difference between the operating direction of the main operation and the operating direction of the preliminary operation makes it easier for a user of the band saw 1 to recognize whether they are performing the main operation or the preliminary operation. Furthermore, the main operation is an operation that moves at least a portion of the stand switch mechanism 34 linearly from the first linear position G1 on the front side of the housing 3 to the second linear position G2 on the rear side. This prevents the band saw 1 from becoming larger.

[0155] In this embodiment, the stand switch mechanism 34 performs a maintenance operation to maintain the main operation in a maintenance state. The operation direction of the main operation and the operation direction of the maintenance operation intersect.

[0156] In the above configuration, the operating direction of the maintenance operation that maintains the main operation intersects with the operating direction of the main operation, thereby preventing a decrease in the operability of the stand switch mechanism 34. The difference between the operating direction of the main operation and the operating direction of the maintenance operation makes it easier for the user of the band saw 1 to recognize whether they are performing the main operation or the maintenance operation.

[0157] In this embodiment, the operation direction of the maintenance operation is opposite to the operation direction of the preliminary operation.

[0158] With the above configuration, the preliminary operation, main operation, and maintenance operation can be performed smoothly and continuously. Furthermore, since the operation direction of the maintenance operation and the operation direction of the preliminary operation are opposite to each other, the band saw 1 is prevented from becoming large.

[0159] In this embodiment, the stand switch mechanism 34 has an operating member 50 on which a preliminary operation is performed. The stand switch mechanism 34 has an operating member 50 on which a maintenance operation is performed. The operating member 50 on which a preliminary operation is performed and the operating member 50 on which a maintenance operation is performed are the same member.

[0160] The above configuration prevents an increase in the number of parts of the stand switch mechanism 34. Also, an increase in the size of the band saw 1 is prevented.

[0161] In this embodiment, the stand switch mechanism 34 has an operating member 50 that performs a main operation, a backup operation, and a maintenance operation.

[0162] The above configuration prevents an increase in the number of parts of the stand switch mechanism 34. Also, an increase in the size of the band saw 1 is prevented.

[0163] In this embodiment, the main operation is an operation of moving the operating member 50 linearly from the first linear position G1 to the second linear position G2. The preliminary operation is an operation of rotating the operating member 50 from the first rotation position R1 to the second rotation position R2. The operating member 50 is maintained in the first linear position G1 in the linear direction, and then rotated from the first rotation position R1 to the second rotation position R2, and then moved linearly to the second linear position G2.

[0164] The above configuration prevents a decrease in the operability of the stand switch mechanism 34. Also, an increase in the size of the band saw 1 is prevented.

[0165] In this embodiment, the stand switch mechanism 34 has a switch case 51 that movably supports the operating member 50. The switch case 51 has an engaged portion 70 that engages with an engaging portion 60 provided on the operating member 50. When the operating member 50 is disposed at a first linear position G1 in the linear direction and at a first rotation position R1 in the rotation direction, the engaging portion 60 engages with the engaged portion 70 that is disposed on the rear side of the engaging portion 60, and the main operation is prevented. When the operating member 50 is rotated from the first rotation position R1 to the second rotation position R2, the engagement between the engaging portion 60 and the engaged portion 70 is released, and the main operation is permitted.

[0166] In the above configuration, when the operating member 50 is disposed in the first straight position G1 and also in the first rotation position R1, the engaged portion 70 of the switch case 51 is disposed further back than the engaging portion 60 of the operating member 50. This blocks the main operation. When the operating member 50 is rotated to the second rotation position R2, the engagement between the engaging portion 60 and the engaged portion 70 is released. This allows the main operation.

[0167] In this embodiment, the stand switch mechanism 34 has a momentary switch 54 located further back than the operating member 50. When the main operation is permitted, the operating member 50 moves straight to the second straight-movement position G2, which operates the momentary switch 54. When the momentary switch 54 is driven, the motor 23 is driven.

[0168] In the above configuration, the momentary switch 54 is used to accommodate high currents.

[0169] In this embodiment, the maintaining operation is an operation of rotating the operating member 50 from the second rotation position R2 to the first rotation position R1. After the operating member 50 is rotated from the second rotation position R2 to the first rotation position R1 while being maintained at the second rectilinear position G2 in the rectilinear direction, the operating member 50 is maintained at the second rectilinear position G2.

[0170] The above configuration prevents a decrease in the operability of the stand switch mechanism 34. Also, an increase in the size of the band saw 1 is prevented.

[0171] In this embodiment, when the operating member 50 is disposed at the second linear position G2 in the linear direction and at the first rotation position R1 in the rotation direction, the engaging portion 60 engages with the engaged portion 70, which is disposed in front of the engaging portion 60, and the main operation is maintained. When the operating member 50 rotates from the first rotation position R1 to the second rotation position R2, the engagement between the engaging portion 60 and the engaged portion 70 is released, and the elastic force of the momentary switch 54 returns the operating member 50 from the second linear position G2 to the first linear position G1 in the linear direction.

[0172] In the above configuration, when the operating member 50 is disposed in the second straight-travel position G2 and the first rotation position R1, the engaging portion 60 of the operating member 50 is disposed further back than the engaged portion 70 of the switch case 51. This maintains the main operation. When the operating member 50 is rotated to the second rotation position R2, the engaging portion 60 and the engaged portion 70 are disengaged. The momentary switch 54 generates an elastic force that returns the operating member 50 from the second straight-travel position G2 to the first straight-travel position G1. When the engaging portion 60 and the engaged portion 70 are disengaged, the elastic force of the momentary switch 54 allows the operating member 50 to move from the second straight-travel position G2 to the first straight-travel position G1. This stops the motor 23, and the main operation is prevented.

[0173] In this embodiment, the operating member 50 has a plate-shaped portion 59 that is long in a direction perpendicular to the central axis MX, which is the rotation axis of the operating member 50.

[0174] In the above configuration, a user of the band saw 1 can smoothly rotate the operating member 50 by pinching the plate-shaped portion 59 with his or her fingers.

[0175] In this embodiment, the band saw 1 includes a battery mounting portion 26 to which a battery pack 41 including a rechargeable battery is attached.

[0176] In the above configuration, there is no need to connect the band saw 1 to a commercial power source with a cable, so the band saw 1 can be easily carried around.

[0177] In this embodiment, the band saw 1 includes a rear saw wheel 27 which is a first saw wheel, a front saw wheel 28 which is a second saw wheel, and a band saw blade 2 which is attached to each of the rear saw wheel 27 and the front saw wheel 28. The output section includes the rear saw wheel 27. The housing 3 includes a rear housing 19 which is a first housing that houses the rear saw wheel 27, a front housing 20 which is a second housing that houses the front saw wheel 28, and a bridge housing 21 which is disposed between the rear housing 19 and the front housing 20 and houses the motor 23. A stand switch mechanism 34 is supported by the front housing 20.

[0178] In the above configuration, the stand switch mechanism 34 is provided on the portable band saw 1 as an electric work machine. The band saw 1 may be used while mounted on a stand 90. Since the stand switch mechanism 34 is supported on the front housing 20, which is disposed adjacent to the bridge housing 21, a user of the band saw 1 can smoothly operate the stand switch mechanism 34 while the band saw 1 is mounted on the stand 90.

[0179] [Second embodiment] A second embodiment will be described below. In this embodiment, the description of the same or equivalent components as those in the first embodiment will be simplified or omitted.

[0180] <Stand switch mechanism> Fig. 19 is a perspective view from the front showing the stand switch mechanism 134 according to this embodiment. Fig. 20 is an exploded perspective view from the front showing the stand switch mechanism 134 according to this embodiment. Fig. 21 is a perspective view from the rear showing the stand switch mechanism 134 according to this embodiment. Fig. 22 is an exploded perspective view from the rear showing the stand switch mechanism 134 according to this embodiment.

[0181] The stand switch mechanism 134 includes a first operating member 150 , a second operating member 152 , a switch case 151 , a coil spring 153 , a momentary switch 154 , and a switch circuit 155 .

[0182] The first operating member 150 has a cylindrical portion 156 , a switch portion 157 , and a slide portion 158 .

[0183] The cylindrical portion 156 has a substantially cylindrical outer shape, and the central axis of the cylindrical portion 156 is parallel to the X-axis.

[0184] The switch portion 157 is connected to the rear portion of the cylindrical portion 156. The switch portion 157 has a flat upper surface.

[0185] The slide portion 158 is provided on each of the left side surface, the right side surface, and the bottom surface of the switch portion 157. The slide portion 158 is long in the X-axis direction.

[0186] The switch portion 157 has an engagement portion 160. The engagement portion 160 is provided on the upper surface of the switch portion 157. The engagement portion 160 has a rectilinear engagement portion 161 and a slide engagement portion 162. The rectilinear engagement portion 161 is long in the left-right direction. The slide engagement portion 162 extends forward from the right end of the rectilinear engagement portion 161.

[0187] The second operating member 152 has a base portion 180 , a plate-shaped portion 159 , a connecting portion 181 , and a sliding portion 182 .

[0188] Plate-shaped portion 159 is connected to the front of base portion 180 via connecting portion 181. Plate-shaped portion 159 is long in the up-down direction. The dimension of connecting portion 181 in the up-down direction is smaller than the dimension of plate-shaped portion 159. Slide portion 182 is provided at the rear of base portion 180. Slide portion 182 is long in the left-right direction.

[0189] The switch case 151 movably supports the first operating member 150 and the second operating member 152. The switch case 151 has an internal space. At least a portion of the first operating member 150 is disposed in the internal space of the switch case 151. At least a portion of the second operating member 152 is disposed in the internal space of the switch case 151. The switch case 151 includes a left switch case 151A and a right switch case 151B. The left switch case 151A and the right switch case 151B are fixed together with a plurality of screws.

[0190] A first support hole 163 and a second support hole 164 are provided on the front side of the switch case 151. The first support hole 163 and the second support hole 164 are provided so as to connect the external space and the internal space of the switch case 151, respectively.

[0191] The cylindrical portion 156 is disposed in the first support hole 163. With the cylindrical portion 156 disposed in the first support hole 163, the first operating member 150 is movable in the front-rear direction.

[0192] The switch portion 157 is disposed in the internal space of the switch case 151. The columnar portion 156 is disposed in the external space of the switch case 151.

[0193] The connecting portion 181 is disposed in the second support hole 164. With the connecting portion 181 disposed in the second support hole 164, the second operating member 152 is movable in the left-right direction.

[0194] The base portion 180 is disposed in the internal space of the switch case 151. The plate-like portion 159 is disposed in the external space of the switch case 151.

[0195] The second operating member 152 has an engaged portion 170 that engages with the engaging portion 160 provided on the first operating member 150. The engaged portion 170 is provided on the underside of the base portion 180. The engaged portion 170 includes a rectilinear engaged portion 171 that engages with the rectilinear engaging portion 161, and a slide engaged portion 172 that engages with the slide engaging portion 162. The rectilinear engaged portion 171 is long in the left-right direction. The slide engaged portion 172 extends rearward from the left end of the rectilinear engaged portion 171.

[0196] The switch case 151 has a guide portion 165 that guides the slide portion 158 of the first operating member 150 in the front-to-rear direction. The switch case 151 also has a guide portion 166 that guides the slide portion 182 of the second operating member 152 in the left-to-right direction.

[0197] The coil spring 153 is disposed in a recess 183 provided in the base portion 180. The recess 183 is formed so as to be recessed downward from the upper surface of the base portion 180. A notch 184 is formed in the left wall of the base portion 180. The left switch case 151A has a rib portion 167 that fits into the notch 184. When the coil spring 153 is disposed in the recess 183, the right end of the coil spring 153 contacts the inner surface of the right wall of the base portion 180 that faces the recess 183. The left end of the coil spring 153 contacts the rib portion 167 via the notch 184. The coil spring 153 applies a biasing force to the second operating member 152 so that the second operating member 152 moves to the right.

[0198] The momentary switch 154 is disposed in the internal space of the switch case 151. The momentary switch 154 is disposed on the rear side of the first operating member 150. The momentary switch 154 is connected to a switch circuit 155. The motor 23 is driven by operating the momentary switch 154 via the first operating member 150. The motor 23 is driven only while the momentary switch 154 is being pressed by the first operating member 150.

[0199] The first operating member 150 is used to perform the main operation, and the second operating member 152 is used to perform the preliminary operation and the maintenance operation.

[0200] The operating direction of the main operation is the front-rear direction. The first operating member 150 can move straight in the front-rear direction while the slide portion 158 is guided by the guide portion 165. By performing the main operation of the first operating member 150, the first operating member 150 can move in the front-rear direction. In this embodiment, the main operation is an operation of moving the first operating member 150 straight from a first straight-movement position G1 on the front side of the front housing 20 to a second straight-movement position G2 on the rear side. By pushing the first operating member 150 towards the rear, the momentary switch 154 is pressed.

[0201] The operation direction of the preliminary operation intersects with the operation direction of the main operation. In this embodiment, the operation direction of the preliminary operation is the left-right direction. The second operating member 152 can slide in the left-right direction while the slide portion 182 is guided by the guide portion 166. When the second operating member 152 is preliminarily operated, the second operating member 152 can slide in the left-right direction. In this embodiment, the preliminary operation is an operation of sliding the second operating member 152 from the first slide position S1 to the second slide position S2.

[0202] The operation direction of the maintenance operation intersects with the operation direction of the main operation. In this embodiment, the operation direction of the maintenance operation is the left-right direction. By performing a maintenance operation on the second operating member 152, the second operating member 152 can slide in the left-right direction. In this embodiment, the operation direction of the maintenance operation is the opposite direction to the operation direction of the auxiliary operation. The maintenance operation is an operation of sliding the second operating member 152 from the second slide position S2 to the first slide position S1.

[0203] <Operation of the stand switch mechanism> Next, the operation of the stand switch mechanism 34 will be described. FIGS. 23, 24, 25, and 26 are diagrams for explaining the operation of the stand switch mechanism 134 according to this embodiment. FIGS. 23 to 26 are transition diagrams showing the operation of the stand switch mechanism 134, which changes the motor 23 from a lock-off state (blocked state) to a lock-off release state (permitted state), and then to a lock-on state (maintained state) via an on state. FIG. 23 is a view of the stand switch mechanism 134 as seen from the right side. FIG. 24 is a view of the stand switch mechanism 134 as seen from the front side. FIG. 25 is a cross-sectional view taken along line CC in FIG. 23. FIG. 26 is a cross-sectional view taken along line DD in FIG. 23.

[0204] 23 to 26, in the unlocked state (blocked state), the first operating member 150 is disposed at a first rectilinear position G1 in the rectilinear direction, and the second operating member 152 is disposed at a first slide position S1 in the slide direction. When the first operating member 150 is disposed at the first rectilinear position G1 and the second operating member 152 is disposed at the first slide position S1, the rectilinear engaging portion 161 and the rectilinear engaged portion 171 face each other. The rectilinear engaged portion 171 is disposed on the rear side of the rectilinear engaging portion 161.

[0205] When the first operating member 150 is disposed at the first rectilinear position G1 and the second operating member 152 is disposed at the first slide position S1, the rectilinear engaging portion 161 engages with the rectilinear engaged portion 171, which is disposed further rearward than the rectilinear engaging portion 161. Because the rectilinear engaging portion 161 contacts the surface of the front side of the rectilinear engaged portion 171, the first operating member 150 cannot move from the first rectilinear position G1 to the second rectilinear position G2. This prevents the main operation from being blocked, and the motor 23 is locked off.

[0206] To change from the unlocked state (blocked state) to the unlocked state (permitted state), the second operating member 152 is slid from the first slide position S1 to the second slide position S2 while the first operating member 150 is maintained at the first rectilinear position G1 in the rectilinear direction. By sliding the second operating member 152 from the first slide position S1 to the second slide position S2, the engagement between the engaging portion 160 and the engaged portion 170 is released. Because the engaging portion 160 moves away from the engaged portion 170, the first operating member 150 can move from the first rectilinear position G1 to the second rectilinear position G2. This puts the main operation into the permitted state, and the motor 23 into the unlocked state.

[0207] When the second operating member 152 is slid from the first slide position S1 to the second slide position S2 and then changed from the unlocked state (permitted state) to the ON state, the first operating member 150 is moved straight from the first straight-travel position G1 to the second straight-travel position G2 while the second operating member 152 is maintained in the second slide position S2. When the first operating member 150 is moved straight from the first straight-travel position G1 to the second straight-travel position G2, the momentary switch 54 is pressed by the switch portion 157 of the first operating member 150. When the primary operation is in the permitted state, the first operating member 150 is moved straight to the second straight-travel position G2 and the momentary switch 54 is pressed, thereby driving the motor 23 and turning the motor 23 ON.

[0208] When the first operating member 150 is changed from the on state to the locked-on state (maintenance state) after moving straight from the first straight-travel position G1 to the second straight-travel position G2, the second operating member 152 slides in the slide direction from the second slide position S2 to the first slide position S1 while the first operating member 150 is maintained at the second straight-travel position G2 in the straight-travel direction. When the first operating member 150 is positioned at the second straight-travel position G2 in the straight-travel direction and the second operating member 152 is positioned at the first slide position S1 in the slide direction, the straight-travel engaging portion 161 and the straight-travel engaged portion 171 face each other. The straight-travel engaged portion 171 is positioned closer to the front than the straight-travel engaging portion 161.

[0209] Further, the slide engaging portion 162 comes into contact with the left end of the rectilinearly moving engaged portion 171 , and the slide engaged portion 172 comes into contact with the right end of the rectilinearly moving engaged portion 161 .

[0210] In this embodiment, the coil spring 53 applies a biasing force to the second operating member 152 so that the second operating member 152 rotates from the second sliding position S2 to the first sliding position S1, thereby allowing the second operating member 152 to slide smoothly from the second sliding position S2 to the first sliding position S1.

[0211] When the first operating member 150 is disposed at the second rectilinear position G2 in the rectilinear direction and the second operating member 152 is disposed at the first slide position S1 in the slide direction, the rectilinear engaging portion 161 engages with the rectilinear engaged portion 171, which is disposed closer to the user than the rectilinear engaging portion 161. Because the rectilinear engaging portion 161 contacts the rear surface of the rectilinear engaged portion 171, the first operating member 150 cannot move from the second rectilinear position G2 to the first rectilinear position G1. The first operating member 150 is maintained at the second rectilinear position G2 in the rectilinear direction. As a result, the main operation is maintained, and the motor 23 is locked on.

[0212] To change from the locked-on state (maintained state) to the unlocked state (blocked state), the second operating member 152 is slid from the first slide position S1 to the second slide position S2. Sliding the second operating member 152 from the first slide position S1 to the second slide position S2 disengages the engaging portion 160 from the engaged portion 170. The momentary switch 54 generates an elastic force that moves the first operating member 150 toward the user. The elastic force of the momentary switch 154 moves the first operating member 150 from the second rectilinear position G2 to the first rectilinear position G1 in the rectilinear direction. The coil spring 153 also applies an urging force to the second operating member 152 so that the second operating member 152 slides from the second slide position S2 to the first slide position S1. As a result, the first operating member 150 is disposed at the first linear position G1 in the linear direction, and the second operating member 152 is disposed at the first slide position S1 in the slide direction, thereby allowing the main operation and releasing the motor 23 from the lock-off state.

[0213] <Effects> As described above, in this embodiment, the stand switch mechanism 134 has the first operating member 150 for performing the main operation, and the second operating member 152 for performing the preliminary operation and the maintenance operation.

[0214] The above configuration prevents an increase in the number of parts of the stand switch mechanism 134. It also prevents the structure of the stand switch mechanism 134 from becoming complicated. It also prevents the band saw 1 from becoming larger.

[0215] In this embodiment, the main operation is an operation of moving the first operating member 150 straight from the first straight-travel position G1 to the second straight-travel position G2. The preliminary operation is an operation of sliding the second operating member 152 from the first sliding position S1 to the second sliding position S2. After the second operating member 152 has slid from the first sliding position S1 to the second sliding position S2, the first operating member 150 moves straight to the second straight-travel position G2.

[0216] The above configuration prevents a decrease in operability of the stand switch mechanism 134. Also, the structure of the stand switch mechanism 134 is prevented from becoming complicated. Also, the band saw 1 is prevented from becoming large.

[0217] In this embodiment, the second operating member 152 has an engaged portion 170 that engages with an engaging portion 160 provided on the first operating member 150. When the first operating member 150 is disposed at the first rectilinear position G1 in the rectilinear direction and the second operating member 152 is disposed at the first slide position S1 in the slide direction, the engaging portion 160 engages with the engaged portion 170 that is disposed on the rear side of the engaging portion 160, and the main operation is blocked. When the second operating member 152 slides from the first slide position S1 to the second slide position S2, the engagement between the engaging portion 160 and the engaged portion 170 is released, and the main operation is permitted.

[0218] In the above configuration, when the first operating member 150 is positioned at the first straight-ahead position G1 and the second operating member 152 is positioned at the first slide position S1, the engaged portion 70 of the second operating member 152 is positioned further back than the engaging portion 60 of the first operating member 150. This places the main operation in a blocked state. When the second operating member 152 is slid to the second slide position S2, the engagement between the engaging portion 160 and the engaged portion 170 is released. This places the main operation in a permitted state.

[0219] In this embodiment, the stand switch mechanism 134 has a momentary switch 154 that is disposed further back than the first operating member 150. When the primary operation is permitted, the first operating member 150 moves straight to the second straight-travel position G2 and operates the momentary switch 154, thereby driving the motor 23.

[0220] In the above configuration, the momentary switch 154 is used to accommodate high currents.

[0221] In this embodiment, the maintaining operation is an operation of sliding the second operating member 152 from the second sliding position S2 to the first sliding position S1. When the first operating member 150 is disposed at the second rectilinear position G2 in the rectilinear direction and the second operating member 152 is disposed at the first sliding position S1 in the sliding direction, the engaging portion 160 engages with the engaged portion 170 that is disposed on the nearer side than the engaging portion 160, and the main operation becomes the maintaining state. When the second operating member 152 slides from the first sliding position S1 to the second sliding position S2, the engagement between the engaging portion 160 and the engaged portion 170 is released, and the first operating member 150 is moved from the second rectilinear position G2 to the first rectilinear position G1 in the rectilinear direction.

[0222] In the above configuration, when the first operating member 150 is disposed at the second linear position G2 and the second operating member 152 is disposed at the first sliding position S1, the engaging portion 160 of the first operating member 150 is disposed further back than the engaged portion 170 of the second operating member 152. As a result, the main operation is maintained. When the second operating member 152 is slid to the second sliding position S2, the engaging portion 160 and the engaged portion 170 are disengaged. As the engaging portion 160 and the engaged portion 170 are disengaged, the first operating member 150 can move from the second linear position G2 to the first linear position G1. As a result, the motor 23 stops, and the main operation is prevented.

[0223] In this embodiment, the second operating member 152 has a plate-like portion 159 that is long in a direction perpendicular to the sliding direction.

[0224] In the above configuration, the user of the band saw 1 can smoothly slide the second operating member 152 by pinching the plate-shaped portion 159 with his or her fingers.

[0225] [Other embodiments] In the above-described embodiment, the electric work machine 1 is a band saw, which is a type of power tool. The power tool is not limited to a band saw. Examples of power tools include a screwdriver, a driver drill, an angle drill, an impact driver, a grinder, a hammer, a hammer drill, a circular saw, and a reciprocating saw. The electric work machine 1 may also be a gardening tool (outdoor power equipment). Examples of gardening tools include a chainsaw, a hedge trimmer, a lawn mower, a brush cutter, and a blower. [Explanation of symbols]

[0226] 1...Band saw (electric work machine), 2...Band saw blade, 3...Housing, 4...Main handle, 4A...Left handle member, 4B...Right handle member, 4C...Screw, 4D...Opening, 4E...Opening, 4F...Opening, 5...Sub-handle, 5A...Left arm portion, 5B...Right arm portion, 5C...Grip portion, 6...Rear base, 6A...Opening, 7...Front base, 7A...Opening, 8...Rear cover, 8A...Opening, 9...Front cover, 9A...Opening, 10...Left middle cover, 11...Right middle cover, 12...Hinge, 13...Hinge, 14...Screw, 15...Screw, 16...Screw, 17...Screw, 18...Screw, 19... Rear housing, 20...front housing, 20A...recess, 21...bridge housing, 22...opening, 23...motor, 24...sensor board, 25...fan, 26...battery mounting section, 27...rear saw wheel (first saw wheel, output section), 28...front saw wheel (second saw wheel), 29...tension adjustment lever, 30...rear guide roller, 31...front guide roller, 32...stopper plate, 32A...through hole, 33...main switch mechanism, 34...stand switch mechanism, 35...speed change dial, 36...light, 37...controller, 37A...printed circuit board, 37B...controller case, 37C...printed surface, 37D...back of board, 37E...front surface of controller case, 37F...back surface of controller case, 38...stator, 39...rotor, 40...rotor shaft, 40A...bearing, 40B...bearing, 41...battery pack, 42...power transmission mechanism, 43...screw, 44...trigger operating member, 45...lock-off operating member, 46...lock-on operating member, 47...switch, 50...operating member, 51...switch case, 51A...left switch case, 51B...right switch case, 52...sleeve, 53...coil spring, 54...momentary switch, 55...switch circuit, 56...large diameter portion, 57...small diameter portion, 58...switch portion, 59...plate-shaped portion, 60...engaging portion, 61...first linear engaging portion, 62...second linear engaging portion, 63...first rotational engaging portion, 64...second rotational engaging portion, 65...support hole, 66...hook portion, 70...engaged portion, 71...first linear engaged portion, 71A...inclined surface, 72...second linear engaged portion, 72A...inclined surface, 73...first rotational engaged portion, 74...second rotational engaged portion, 75...front ring portion, 76...rear ring portion, 77...hook portion, 81...first rib portion, 82...second rib portion, 83...third rib portion, 84...fourth rib portion, 90...stand,91...base, 92...vice, 92A...fixed vice, 92B...movable vice, 92C...screw, 92D...support member, 92E...knob, 93...support member, 94...hinge, 95...contour table, 134...stand switch mechanism, 150...first operating member, 151...switch case, 151A...left switch case, 151B...right switch case, 152...second operating member, 153...coil spring, 154...momentary switch, 155...switch circuit, 156...cylindrical portion, 157...switch portion, 158...slide portion, 159...plate-shaped portion, 160...engagement portion, 1 61...linear engagement portion, 162...slide engagement portion, 163...first support hole, 164...second support hole, 165...guide portion, 166...guide portion, 167...rib portion, 170...engaged portion, 171...linear engaged portion, 172...slide engaged portion, 180...base portion, 181...connecting portion, 182...slide portion, 183...recess, 184...notch, AX...motor rotating shaft, CX1...first rotating shaft, CX2...second rotating shaft, MX...center axis, G1...first linear position, G2...second linear position, R1...first rotation position, R2...second rotation position, S1...first slide position, S2...second slide position.

Claims

1. A motor; a first saw wheel driven by the motor; A second saw wheel; a band saw blade attached to each of the first saw wheel and the second saw wheel; a first switch mechanism having a first trigger member that is operated as a first main operation to drive the motor, and that is changed, by a first preliminary operation, from a first lock-off state in which the first main operation is prevented to a first lock-off release state in which the first lock-off state is released; a second switch mechanism that has a second trigger member that is operated as a second main operation to drive the motor, and that is changed, by a second preliminary operation, from a second lock-off state in which the second main operation is prevented to a second lock-off release state in which the second lock-off state is released; The motor is driven by the first main operation of the first trigger member and the second main operation of the second trigger member. Portable band saw.

2. The second saw wheel is disposed forward of the first saw wheel, a first housing in which the first saw wheel is housed; a second housing in which the second saw wheel is housed; the first trigger member is disposed rearward of a front end portion of the first housing, The second trigger member is disposed forward of the rear end portion of the second housing. The portable band saw according to claim 1.

3. a bridge housing connecting an upper portion of the first housing and an upper portion of the second housing; At least a portion of the band saw blade is disposed in an opening provided between a lower portion of the bridge housing, a front portion of the first housing, and a rear portion of the second housing; The second trigger member is disposed above an upper end of the second housing. The portable band saw according to claim 2.

4. a sub-handle including a left arm connected to a left portion of an upper part of the second housing, a right arm connected to a right portion of an upper part of the second housing, and a grip connecting the left arm and the right arm, The second trigger member is disposed between the left arm portion and the right arm portion in the left-right direction. The portable band saw according to claim 3.

5. the second switch mechanism has a lock-off member separate from the second trigger member, The second preliminary operation includes a preliminary operation of the lock-off member. The portable band saw according to claim 1.

6. The main operation direction of the second trigger member and the preliminary operation direction of the lock-off member intersect with each other. The portable band saw according to claim 5.

7. The main operation direction of the second trigger member and the preliminary operation direction of the lock-off member are perpendicular to each other. The portable band saw according to claim 5.

8. When the lock-off member is maintained in operation after the second main operation of the second trigger member, the second switch mechanism changes to a second lock-on state in which the second main operation is maintained. The portable band saw according to claim 5.

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