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 Art

[0002] An electric working machine includes a motor and a switch mechanism that is operated to drive or stop the motor. Patent Document 1 discloses an electric tool including a trigger switch for switching on or off the motor and a lock-on means capable of maintaining the on state of the motor. Patent Document 2 discloses an electric tool including a switch lever movable between an on position for starting the electric tool and an off position for stopping it, a lock-on mechanism for locking the switch lever in the on position, and a lock-off mechanism for locking the switch lever in the off position.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an electric working machine having a lock-off function, a technology capable of suppressing a decrease in operability is desired.

[0005] The technology disclosed in this specification aims to suppress a decrease in the operability of an electric working machine.

Means for Solving the Problems

[0006] This specification discloses an electric work machine. The electric work machine may include a motor, a housing for 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 to drive the motor and a preliminary operation to enable the main operation from a blocked state. The main operation may be an operation to move at least a portion of the switch mechanism in a straight line from a first straight line position on the front side of the housing to a second straight line position on the rear side. The operating direction of the main operation and the operating direction of the preliminary operation may intersect. [Effects of the Invention]

[0007] The technology disclosed herein suppresses the deterioration of the operability of electric work machines. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a rear perspective view showing an electric work machine according to the first embodiment. [Figure 2] Figure 2 is a front perspective view showing an electric work machine according to the first embodiment. [Figure 3] Figure 3 is a rear view of the electric work machine according to the first embodiment. [Figure 4] Figure 4 is a view of the electric work machine according to the first embodiment, seen from the front. [Figure 5] Figure 5 is a view of the electric work machine according to the first embodiment, seen from the left side. [Figure 6] Figure 6 is a view of the electric work machine according to the first embodiment, seen from the right side. [Figure 7] Figure 7 is a view from the right side of the electric work machine according to the first embodiment, with the rear cover and front cover open. [Figure 8] Figure 8 is a cross-sectional view showing an electric work machine according to the first embodiment. [Figure 9] Figure 9 is a front perspective view 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 from the rear showing the stand switch mechanism according to the first embodiment. [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 diagram for explaining the usage method of the band saw according to the first embodiment. [Figure 18] FIG. 18 is a diagram for explaining the usage method of 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 from the rear showing the stand switch mechanism according to the second embodiment. [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. MODE FOR CARRYING OUT THE INVENTION

[0009] In one or more embodiments, the electric working machine may include a motor, a housing that houses 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 for driving the motor and a preliminary operation for changing the main operation from a blocked state to an allowed state. The main operation may be an operation of directly moving at least a part of the switch mechanism from a first straight-ahead position on the front side of the housing to a second straight-ahead position on the back side. The operation direction of the main operation and the operation direction of the preliminary operation may intersect.

[0010] In the above configuration, the main operation for driving the motor is an operation of directly moving at least a part of the switch mechanism from the first straight-ahead position to the second straight-ahead position. The operation direction of the preliminary operation for changing the main operation from the blocked state to the allowed state intersects the operation direction of the main operation. Therefore, a decrease in the operability of the switch mechanism is suppressed. The user of the electric working machine can easily recognize which of the main operation and the preliminary operation is being performed based on the difference between the operation directions of the main operation and the preliminary operation. Further, the main operation is an operation of directly moving at least a part of the switch mechanism from the first straight-ahead position on the front side of the housing to the second straight-ahead position on the back side. Therefore, an increase in the size of the electric working machine is suppressed.

[0011] In one or more embodiments, the switch mechanism may perform a maintaining operation for maintaining the main operation. The operation direction of the main operation and the operation direction of the maintaining operation may intersect.

[0012] In the above configuration, the operating direction for the maintenance operation, which maintains the main operation, intersects with the operating direction for the main operation. Therefore, a decrease in the operability of the switch mechanism is suppressed. Users of electric work equipment can easily recognize whether they are performing the main operation or the maintenance operation due to the difference in operating directions between the main operation and the maintenance operation.

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

[0014] In the above configuration, preparatory operations, main operations, and maintenance operations can be performed continuously and smoothly. Furthermore, since the operating direction of the maintenance operation and the operating direction of the preparatory operation are opposite, the size of the electric work implement is kept from increasing.

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

[0016] The above configuration suppresses the increase in the number of parts in the switch mechanism. Furthermore, it suppresses the need to increase the size of the electric work equipment.

[0017] In one or more embodiments, the switch mechanism may have operating members that perform a primary operation, a preliminary operation, and a maintenance operation.

[0018] The above configuration suppresses the increase in the number of parts in the switch mechanism. Furthermore, it suppresses the need to increase the size of the electric work equipment.

[0019] In one or more embodiments, the primary operation may be an operation to move the operating member in a straight line from a first straight line position to a second straight line position. The preliminary operation may be an operation to rotate the operating member from a first rotation position to a second rotation position. The operating member may be rotated from the first rotation position to the second rotation position while being maintained in the first straight line position in the straight line direction, and then moved in a straight line to the second straight line position.

[0020] The above configuration suppresses a decrease in the operability of the switch mechanism. Furthermore, it suppresses the need to increase the size of the electric work equipment.

[0021] In one or more embodiments, the switch mechanism may have a switch case that movably supports an operating member. The switch case may have an engaged portion that engages with an engaging portion provided on the operating member. When the operating member is positioned in a first linear position in the linear direction and in a first rotational position in the rotational direction, the engaging portion and the engaged portion located further back than the engaging portion may engage, thereby preventing the main operation. When the operating member rotates from the first rotational position to a second rotational position, the engagement between the engaging portion and the engaged portion may be released, allowing the main operation.

[0022] In the above configuration, the operating member is positioned in both the first straight-ahead position and the first rotational position, so that the engaged portion of the switch case is positioned further back than the engaged portion of the operating member. This prevents the main operation. When the operating member is rotated to the second rotational position, the engagement between the engaged portion and the engaged portion is released. This allows the main operation.

[0023] In one or more embodiments, the switch mechanism may include a momentary switch positioned behind the operating member. The momentary switch may be operated by the operating member moving in a straight line to a second straight line position when the main operation is permitted. The motor may be driven by the driving of the momentary switch.

[0024] In the above configuration, the use of a momentary switch allows for handling high currents.

[0025] In one or more embodiments, the maintenance operation may be an operation to rotate the operating member from the second rotation position to the first rotation position. The operating member may be rotated from the second rotation position to the first rotation position while being maintained in the second straight-ahead position in the straight-ahead direction, and then maintained in the second straight-ahead position.

[0026] The above configuration suppresses a decrease in the operability of the switch mechanism. Furthermore, it suppresses the need to increase the size of the electric work equipment.

[0027] In one or more embodiments, the operating member may be positioned at a second linear position in the linear direction and at a first rotational position in the rotational direction, thereby engaging the engaging portion and the engaged portion positioned in front of the engaging portion, and maintaining the main operation. The engagement between the engaging portion and the engaged portion may be released by the operating member rotating from the first rotational position to the second rotational position, 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, the operating member is positioned in both the second linear position and the first rotational position, so that the engaging portion of the operating member is positioned further back than the engaged portion of the switch case. This maintains the main operation. When the operating member is rotated to the second rotational position, the engagement between the engaging portion and the engaged portion is released. The momentary switch generates an elastic force that returns the operating member from the second linear position to the first linear position. With the engagement between the engaging portion and the engaged portion released, the operating member can move from the second linear position to the first linear position due to the elastic force of the momentary switch. As a result, the motor stops and the main operation is blocked.

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

[0030] In the above configuration, the user of the electric work machine can smoothly rotate the operating member by pinching the plate-shaped part with their fingers.

[0031] In one or more embodiments, the switch mechanism may include a first operating member for performing the main operation and a second operating member for performing the preliminary and maintenance operations.

[0032] The above configuration suppresses an increase in the number of parts in the switch mechanism. It also suppresses an increase in the structural complexity of the switch mechanism. Furthermore, it suppresses an increase in the size of the electric work machine.

[0033] In one or more embodiments, the primary operation may be an operation to move the first operating member in a straight line from a first straight line position to a second straight line position. The preliminary operation may be an operation to slide the second operating member from a first slide position to a second slide position. The first operating member may move in a straight line to a second straight line position after the second operating member has been slid from the first slide position to the second slide position.

[0034] The above configuration suppresses a decrease in the operability of the switch mechanism. It also suppresses the complexity of the switch mechanism's structure. Furthermore, it suppresses the increase in the size of the electric work machine.

[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 positioned in a first straight-line position in the straight-line direction and the second operating member is positioned in a first sliding position in the sliding direction, the engaging portion and the engaged portion positioned further back than the engaging portion may engage, preventing the main operation. When the second operating member slides from the first sliding position to the second sliding position, the engagement between the engaging portion and the engaged portion may be released, allowing the main operation.

[0036] In the above configuration, the first operating member is positioned in the first straight-ahead position and the second operating member is positioned in the first sliding position, so that the engaged portion of the second operating member is positioned further back than the engaged portion of the first operating member. This prevents the main operation. When the second operating member is slid to the second sliding position, the engagement between the engaged portion and the engaged portion is released. This allows the main operation to be performed.

[0037] In one or more embodiments, the switch mechanism may include a momentary switch positioned behind the first operating member. In a state where the main operation is permitted, the motor may be driven by the first operating member moving straight to the second straight position and operating the momentary switch.

[0038] In the above configuration, the use of a momentary switch allows for handling high currents.

[0039] In one or more embodiments, the maintenance operation may be an operation to slide the second operating member from the second slide position to the first slide position. The main operation may be maintained when the first operating member is positioned at the second straight-line position in the straight-line direction and the second operating member is positioned at the first slide position in the sliding direction, so that the engaging portion and the engaged portion positioned in front of the engaging portion engage. The engagement between the engaging portion and the engaged portion may be released when the second operating member slides from the first slide position to the second slide position, and the first operating member may move from the second straight-line position to the first straight-line position in the straight-line direction.

[0040] In the above configuration, the first operating member is positioned in the second straight-ahead position and the second operating member is positioned in the first slide position, so that the engaging portion of the first operating member is positioned further back than the engaged portion of the second operating member. This maintains the main operation. When the second operating member slides to the second slide position, the engagement between the engaging portion and the engaged portion is released. With the engagement between the engaging portion and the engaged portion released, the first operating member can move from the second straight-ahead position to the first straight-ahead position. This stops the motor and prevents the main operation.

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

[0042] In the above configuration, the user of the electric work machine can smoothly slide the second operating member by pinching the plate-shaped part with their fingers.

[0043] In one or more embodiments, the electric work machine may include a battery mounting section into which a rechargeable battery is installed.

[0044] With the above configuration, there is no need to connect the electric work equipment to the commercial power supply with a cable, making it easy to transport the electric work equipment.

[0045] In one or more embodiments, the electric work machine may include a first saw wheel, a second saw wheel, and band saw blades that are mounted on the first and second saw wheels, respectively. The output unit may include the first saw wheel. The housing may include a first housing that accommodates the first saw wheel, a second housing that accommodates the second saw wheel, and a bridge housing positioned between the first and second housings that houses the motor. The switch mechanism may be supported in the second housing.

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

[0047] The embodiments of this disclosure will be described below with reference to the drawings, but this disclosure is not limited to these 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 for the electric work machine 1, and the positional relationships of each part are described while referring to the local coordinate system. The 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 a 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 assumed to be parallel to the horizontal plane. The X-axis direction is the front-back direction, with the +X side being the front and the -X side being the rear. The Y-axis direction is the left-right direction, with the +Y side being the left and the -Y side being the right. The Z-axis direction is the up-down direction, with the +Z side being the up and the -Z side being the down. Furthermore, the direction parallel to the first rotation axis CX1 of the rear saw wheel 27 and the second rotation axis CX2 of the front saw wheel 28, respectively, is defined as the MS direction, and the direction perpendicular to both the MS direction and the front-rear direction is defined as the KL direction. The vertical direction is inclined with respect to both 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 between the downward direction and the S direction is 55 degrees. The angle between the right direction and the S direction is 35 degrees.

[0049] [First Embodiment] The first embodiment will be described.

[0050] <Electric work equipment> Figure 1 is a rear perspective view showing the electric work machine 1 according to this embodiment. Figure 2 is a front perspective view showing the electric work machine 1 according to this embodiment. Figure 3 is a rear view of the electric work machine 1 according to this embodiment. Figure 4 is a front view of the electric work machine 1 according to this embodiment. Figure 5 is a left view of the electric work machine 1 according to this embodiment. Figure 6 is a right view of the electric work machine 1 according to this embodiment.

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

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

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

[0054] Housing 3 is long in the front-to-back direction. Housing 3 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 positioned behind 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 to the front. The rear cover 8 is positioned to the lower right (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 to the front. The rear base 6 and the rear cover 8 are positioned parallel to each other and overlapping. The upper right part of the rear base 6 and the upper right part of the rear cover 8 are connected via a hinge 12. The pivot 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 positioned in front 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 to the front. The front cover 9 is positioned to the lower right (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 to the front. The front base 7 and the front cover 9 are positioned parallel to each other. The upper right part of the front base 7 and the upper right part of the front cover 9 are connected via a hinge 13. The pivot 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 positioned between the upper part (upper left) of the rear base 6 and the upper part (upper left) of the front base 7. The rear of the left middle cover 10 is fixed to the upper part (upper left) of the rear base 6 by a screw 14. The front of the left middle cover 10 is fixed to the upper part (upper left) of the front base 7 by a screw 15.

[0058] The right middle cover 11 is positioned between the top of the rear base 6 and the top of the front base 7. The rear of the right middle cover 11 is fixed to the top of the rear base 6 by a screw 16. The front of the right middle cover 11 is fixed to the top of the front base 7 by a screw 17.

[0059] The right middle cover 11 is positioned to the right of the left middle cover 10. The left middle cover 10 and the right middle cover 11 are fixed together by screws 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 metal. Examples of metals used to form 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 used to 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 synthetic resins used to form 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 as appropriate, the front base 7 and front cover 9 will be collectively referred to as the front housing 20 as appropriate, and the left middle cover 10 and right middle cover 11 will be collectively referred to as the bridge housing 21 as appropriate.

[0064] In the front-rear direction, the bridge housing 21 is positioned between the rear housing 19 and the front housing 20. The bridge housing 21 is positioned 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 and 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 the user of the band saw 1. The main handle 4 is positioned 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 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 by a number 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 the user of the band saw 1. The sub-handle 5 has a left arm section 5A connected to the upper left part of the front base 7, a right arm section 5B connected to the upper right part of the front base 7, and a grip section 5C connecting the left arm section 5A and the right arm section 5B. The left arm section 5A is positioned to extend upward from the upper left part of the front base 7 toward the front. The right arm section 5B is positioned to extend upward from the upper left part of the front base 7 toward the front. The grip section 5C is positioned to connect the upper end of the left arm section 5A and the upper end of the right arm section 5B.

[0067] Figure 7 is a view from the right side of the electric work machine 1 with the rear cover 8 and front cover 9 of this embodiment open. Figure 8 is a cross-sectional view showing the electric work machine 1 of this embodiment.

[0068] As shown in Figures 1 to 8, the band saw 1 comprises 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 control dial 35, a light 36, and a controller 37.

[0069] Motor 23 is the power source for the band saw 1. Motor 23 is housed in the bridge housing 21. That is, motor 23 is located in the middle space, which is the internal space of the bridge housing 21. Motor 23 is located at the rear of the middle space. Motor 23 is an inner rotor type brushless motor. 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 mounted to the stator core via the insulator, and a busbar unit connecting the plurality of coils. The busbar unit is positioned in front 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 located 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 located in front of the stator 38. The rear portion of the rotor shaft 40 is located behind the stator 38. The front portion of the rotor shaft 40 is rotatably supported by bearing 40A. The rear portion of the rotor shaft 40 is rotatably supported by bearing 40B. Bearings 40A and 40B are each supported by the bridge housing 21.

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

[0074] The sensor board 24 detects the rotational position of the rotor 39. The sensor board 24 is housed in the bridge housing 21. The sensor board 24 supports a magnetic sensor that detects the permanent magnets of the rotor 39. The magnetic sensor detects the rotational position of the rotor 39 by detecting the magnetic field of the permanent magnets. The sensor board 24 is positioned in front 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 positioned between the bearing 40B and the stator core. The fan 25 rotates together with the rotor shaft 40. The rotation of the fan 25 generates airflow for cooling the motor 23 and the controller 37.

[0076] The battery mounting section 26 is connected to the battery pack 41. The battery pack 41 is mounted in the battery mounting section 26. The battery mounting section 26 is located on top of the bridge housing 21. The battery pack 41 is the 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 busbar unit of the stator 38 via the controller 37. Multiple power lines are arranged to connect the controller 37 and the busbar unit.

[0078] In addition, multiple 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 positioned in the rear space, which is the internal space of the rear housing 19. Part 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 around a first rotation axis CX1. The first rotation axis CX1 is parallel to the YZ plane. The first rotation axis CX1 is tilted upward toward the left. The first rotation axis CX1 is tilted at an angle of 55 degrees downward.

[0080] The front saw wheel 28 is housed in the front housing 20. That is, the front saw wheel 28 is positioned in the front space, which is the internal space of the front housing 20. Part 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 on the front base 7. The front saw wheel 28 rotates around the second rotation axis CX2. The first rotation axis CX1 and the second rotation axis CX2 are parallel. The second rotation axis CX2 is tilted at an angle of 55 degrees to the downward direction.

[0081] The band saw blade 2 is mounted on the rear saw wheel 27 and the front saw wheel 28, respectively. The band saw blade 2 is annular in shape. The band saw blade 2 is pulled in the front-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 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 is parallel to the XZ plane in the area of ​​the opening 22. That is, the band saw blade 2 is twisted near the boundary of the opening 22 so as to change from a position parallel to the right surface of the band saw blade 2 to a position parallel to the XZ plane. The twist angle of the band saw blade 2 is 55 degrees.

[0082] As shown in Figure 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 the 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 the 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 opening 6A and 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. The rotation of the rotor shaft 40 causes the rear saw wheel 27 to rotate.

[0084] The rear saw wheel 27 is an output unit 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 motor 23 rotates the rear saw wheel 27 around the first rotation axis CX1, the band saw blade 2 rotates while being supported by the rear saw wheel 27 and the front saw wheel 28, respectively. With the band saw blade 2 attached, the front saw wheel 28 rotates around 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. When the tension adjustment lever 29 is operated, the front saw wheel 28 moves in the forward and backward direction. As the front saw wheel 28 moves in the forward and backward 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 positioned at the front of the rear base 6 facing the opening 22. A pair of rear guide rollers 30 are provided so as to sandwich the band saw blade 2 from the left and right directions. The axis of rotation of the rear guide rollers 30 is parallel to the Z-axis.

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

[0088] The stopper plate 32 supports the object to be cut. The stopper plate 32 is supported at the front of the rear base 6. The band saw blade 2 rotates to move from the front base 7 to the rear base 6 in 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 vertically elongated through hole 32A. The stopper plate 32 is fixed to the rear base 6 by a screw 43 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 located on the main handle 4. At least a portion of the main switch mechanism 33 is located in the handle space, which is the internal space of the main handle 4.

[0090] The main switch mechanism 33 includes 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 located on the top of the main handle 4. The main handle 4 has an opening 4D in which the trigger operating member 44 is located. The opening 4D is located on the lower surface of the top of the main handle 4. The switch 47 is located in the handle space. The switch 47 is operated by pulling the trigger operating member 44 so that it enters the handle space. The motor 23 is driven when the switch 47 is operated.

[0092] The lock-off operating member 45 is operated to change the operation of the trigger operating member 44 from a blocked state to an allowed 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 opening 4E is located on the left and right sides of the top of the main handle 4, respectively. By pushing the lock-off operating member 45 into the handle space, the operation of the trigger operating member 44 is changed from a blocked state to an allowed state.

[0093] If the lock-off operating member 45 is not operated, the operation of the trigger operating member 44 is prevented. The user of the band saw 1 cannot operate the trigger operating member 44 if the lock-off operating member 45 is not operated. When the lock-off operating member 45 is pushed in so that it enters the handle space, the prevention state is released and the operation of the trigger operating member 44 is permitted. The user of the band saw 1 can pull the trigger operating member 44 by pushing the lock-off operating member 45.

[0094] The lock-on operating member 46 is operated to maintain the pulled state of the trigger operating member 44. The lock-on operating member 46 is located on the upper part of the main handle 4. The main handle 4 has an opening 4F in which the lock-on operating member 46 is located. The opening 4F is located on the upper left side of the main handle 4. After the trigger operating member 44 is pulled, the lock-on operating member 46 is pushed in so that it enters the handle space, thereby maintaining the pulled state of the trigger operating member 44.

[0095] If the trigger operating member 44 is pulled and then the lock-on operating member 46 is pushed so that it enters the handle space, the pulled state of the trigger operating member 44 is maintained. After the trigger operating member 44 is pulled, the lock-on operating member 46 is pushed, so that even if the pull operation of the trigger operating member 44 is released, the motor 23 can remain locked in and continue to drive. The user of the band saw 1 can pull the trigger operating member 44 with their finger and then push the lock-on operating member 46, so that the motor 23 can continue to drive even after releasing their finger from the trigger operating member 44.

[0096] In other words, before the trigger operating member 44 is pulled, the motor 23 is in an off state where it is stopped. Before the lock-off operating member 45 is pushed, the trigger operating member 44 is in a blocked state where it is prevented from being pulled. The blocked state where the trigger operating member 44 is prevented from being pulled is a lock-off state where the motor 23 is locked in an off state. After the lock-off operating member 45 is pushed, the trigger operating member 44 is allowed to be pulled. After the lock-off operating member 45 is pushed and the trigger operating member 44 is pulled, the motor 23 is in an on state where it is driven. After the trigger operating member 44 is pulled and the lock-on operating member 46 is pushed, the trigger operating member 44 is in a maintained state where it is maintained from being pulled. The maintained state where the trigger operating member 44 is maintained is a lock-on state where the motor 23 is locked in an on state. In the locked-on state, the lock-on state is released when the trigger operating member 44 is pulled again after releasing the fingers from the trigger operating member 44 and the lock-on operating member 46.

[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 located on the front side of the bridge housing 21. At least a portion of the stand switch mechanism 34 is located in a recess 20A formed on the upper part of the front housing 20. At least a portion of the stand switch mechanism 34 is located between the left arm portion 5A and the right arm portion 5B of the sub-handle 5.

[0098] The speed control dial 35 is operated to adjust the rotational speed of the motor 23. The speed control dial 35 is located on top of the main handle 4.

[0099] Light 36 illuminates the object to be cut. Light 36 is located at the lower 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 a magnetic sensor mounted on the sensor board 24. The controller 37 includes one printed circuit board 37A and a plurality of 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 its recess and outer casing are formed in a rectangular shape when viewed from the direction of the recess. A printed circuit board 37A, which is also rectangular and has almost the same shape, is inserted into the recess. Here, the bottom surface of the controller case 37B is called the controller case surface 37E, the surface opposite the controller case surface 37E is called the controller case back surface 37F, the side of the printed circuit board 37A from which the lead wires (not shown) extend is called the back surface 37D, and the surface opposite the back surface 37D is called the printed surface 37C.

[0101] The controller 37 is housed in the bridge housing 21. That is, the controller 37 is located in the middle space, which is the internal space of the bridge housing 21. The controller 37 is located at the top of the middle space. At least a portion of the controller 37 is located 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 located 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 components of the main switch mechanism 33 and the stand switch mechanism 34 are connected in series.

[0103] When the motor 23 is driven or stopped by operating the main switch mechanism 33, the stand switch mechanism 34 is locked on. The user of the band saw 1 can drive or stop the motor 23 by operating the main switch mechanism 33 while the stand switch mechanism 34 is locked on.

[0104] When the motor 23 is driven or stopped by operating the stand switch mechanism 34, the main switch mechanism 33 is locked on. The user of the band saw 1 can drive or stop the motor by operating the stand switch mechanism 34 while the main switch mechanism 33 is locked on.

[0105] <Stand switch mechanism> Figure 9 is a front perspective view showing the stand switch mechanism 34 according to this embodiment. Figure 10 is an exploded front perspective view showing the stand switch mechanism 34 according to this embodiment. Figure 11 is a rear perspective view showing the stand switch mechanism 34 according to this embodiment. Figure 12 is an exploded rear perspective view 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 section 56 is substantially cylindrical. The outer shape of the small-diameter section 57 is substantially cylindrical. The small-diameter section 57 is connected to the rear of the large-diameter section 56. The outer diameter of the large-diameter section 56 is larger than the outer diameter of the small-diameter section 57. The central axis of the large-diameter section 56 and the central axis of the small-diameter section 57 coincide. In the following description, the central axis of the large-diameter section 56 and the central axis of the small-diameter section 57 will be collectively referred to as the central axis MX of the operating member 50. The central axis MX is parallel to the X-axis.

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

[0110] The switch section 58 has an engaging section 60. The engaging section 60 includes a first linear engaging section 61, a second linear engaging section 62, a first rotational engaging section 63, and a second rotational engaging section 64. The first linear engaging section 61 includes the upper left corner of the switch section 58. The second linear engaging section 62 includes the lower right corner of the switch section 58. The first rotational engaging section 63 includes the lower left corner of the switch section 58. The second rotational engaging section 64 includes the upper right corner of the switch section 58. The first linear engaging section 61 and the second linear engaging section 62 are arranged on a first diagonal of the switch section 58 passing through the central axis MX. The first rotational engaging section 63 and the second rotational engaging section 64 are arranged on a second diagonal of the switch section 58 passing through the central axis MX.

[0111] The plate-like portion 59 is connected to the front of the large-diameter portion 56. The outer shape of the plate-like portion 59 is elongated in the direction perpendicular to the central axis MX of the operating member 50. In Figures 9 to 12, the plate-like portion 59 extends in the vertical direction. The vertical dimension of the plate-like 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 positioned. The switch case 51 has a so-called 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 by a number 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 positioned in a recess 20A formed in the upper part of the front housing 20. The switch case 51 is positioned 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 so as to connect the external space and the internal space of the switch case 51. The large diameter portion 56 is positioned 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 the front-rear direction and in the rotational direction about the central axis MX. The central axis MX of the operating member 50 and the axis of rotation of the operating member 50 coincide.

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

[0116] The switch case 51 has an engaged portion 70 that engages with an engaging portion 60 provided on the operating member 50. The engaged portion 70 includes a first straight-line engaged portion 71 that engages with a first straight-line engaged portion 61, a second straight-line engaged portion 72 that engages with a second straight-line engaged portion 62, a first rotational engaged portion 73 that engages with a first rotational engaged portion 63, and a second rotational engaged portion 74 that engages with a second rotational engaged 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. Each of the first rib portion 81, the second rib portion 82, the third rib portion 83, and the fourth rib portion 84 is located in the internal space of the switch case 51.

[0118] The left switch case 51A has a right inner surface facing to the right. The right switch case 51B has a left inner surface facing to the 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 positioned above the third rib portion 83. The second rib portion 82 is positioned below the fourth rib portion 84. In the vertical direction, the first rib portion 81 is positioned between the fourth rib portion 84 and the second rib portion 82. In the vertical direction, the second rib portion 82 is positioned between the first rib portion 81 and the third rib portion 83.

[0120] The first rib portion 81 includes a first straight-moving engaged portion 71. The second rib portion 82 includes a second straight-moving engaged portion 72. The third rib portion 83 includes a first rotating engaged portion 73. The fourth rib portion 84 includes a second rotating 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 downwards to the left. An inclined surface 72A is provided at the left end of the second rib portion 82. The inclined surface 72A slopes upwards to the right.

[0122] The sleeve 52 is positioned 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-rear direction. The sleeve 52 is positioned 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 positioned in the internal space of the switch case 51. One end of the coil spring 53 is hooked onto 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 onto a hook portion 77 provided on the inner surface of the switch case 51. The coil spring 53 provides a biasing force to the operating member 50 so that it rotates in a specified rotational direction.

[0124] The momentary switch 54 is located in the internal space of the switch case 51. The momentary switch 54 is located behind the operating member 50. The momentary switch 54 is connected to the switch circuit 55. The motor 23 is driven when the momentary switch 54 is operated via the operating member 50. The motor 23 is driven only for the duration that the momentary switch 54 is pressed by the operating member 50.

[0125] The operating member 50 performs a main operation, a preliminary operation, and a maintenance operation. The main operation is the operation to drive the motor 23. The preliminary operation is the operation to change the main operation from a blocked state to an allowed state. The maintenance operation is the operation to maintain the main operation.

[0126] Before the main operation is performed, the motor 23 is in the off state, stopped. Before the preliminary operation is performed, the main operation is blocked. The blocked state, where the main operation is blocked, is the lock-off state, where the motor 23 is fixed in the off state. After the preliminary operation is performed and before the main operation is performed, the main operation is permitted. The permitted state, where the main operation is permitted, is the lock-off released state, where the motor 23's lock-off state is released. After the preliminary operation is performed and the main operation is performed, the motor 23 is in the on state, driven. After the main operation is performed and the maintenance operation is performed, the main operation is maintained. The maintained state, where the main operation is maintained, is the lock-on state, where the motor 23 is fixed in the on state.

[0127] The operating direction of the main operation is the front-rear direction. The operating member 50 can move in a straight line in the front-rear direction. When the operating member 50 is operated in the main operation, the operating member 50 can move in the front-rear direction. In this embodiment, the main operation is an operation to move the operating member 50 in a straight line from a first straight-line position G1 on the front side of the front housing 20 to a second straight-line position G2 on the rear side. The stand switch mechanism 34 is located on the front side of the bridge housing 21. The front side of the bridge housing 21 is the front side. The rear side of the bridge housing 21 is the rear side. The first straight-line position G1 is defined as being in front of the second straight-line position G2. The operation to move the operating member 50 in a straight line from the first straight-line position G1 to the second straight-line position G2 includes an operation to push the operating member 50 to the rear so that the operating member 50 enters the internal space of the switch case 51. The operation to push the operating member 50 to the rear includes an operation to push the operating member 50 so that the operating member 50 approaches the bridge housing 21. The momentary switch 54 is positioned behind the operating member 50. When the operating member 50 is pushed inward, the momentary switch 54 is pressed.

[0128] The direction of the preliminary operation intersects with the direction of the main operation. In this embodiment, the direction of the preliminary operation is the rotational direction around the central axis MX. The central axis MX is parallel to the X-axis. The central axis MX and the rotation axis of the operating member 50 coincide. The operating member 50 can rotate around the central axis MX. By performing a preliminary operation on the operating member 50, the operating member 50 can rotate around the central axis MX. In this embodiment, the preliminary operation is an operation that rotates the operating member 50 from the first rotation position R1 to the second rotation position R2.

[0129] The operating direction of the hold operation intersects with the operating direction of the main operation. In this embodiment, the operating direction of the hold operation is the rotational direction around the central axis MX. When the operating member 50 is held, the operating member 50 can rotate around the central axis MX. In this embodiment, the operating direction of the hold operation is the opposite direction to the operating direction of the preparatory operation. The hold operation is an operation that rotates 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. Figures 13, 14, 15, and 16 are diagrams illustrating the operation of the stand switch mechanism 34 according to this embodiment. Figures 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 (blocking state) to a lock-off release state (allowing state), then through an ON state to a lock-on state (maintaining state). Figure 13 is a view of the stand switch mechanism 34 from the right side. Figure 14 is a view of the stand switch mechanism 34 from the front. Figure 15 is a cross-sectional view taken along line AA in Figure 13. Figure 16 is a side cross-sectional view of Figure 13.

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

[0132] As shown in Figures 13 to 16, in the lock-off state (blocked state), the operating member 50 is positioned at a first straight-line position G1 in the straight-line direction and at a first rotational position R1 in the rotational direction. When the operating member 50 is positioned at the first straight-line position G1 and the first rotational position R1, the first straight-line engaging portion 61 and the first straight-line engaged portion 71 face each other, and the second straight-line engaging portion 62 and the second straight-line engaged portion 72 face each other. The first straight-line engaged portion 71 is positioned further back than the first straight-line engaging portion 61, and the second straight-line engaged portion 72 is positioned further back than the second straight-line engaging portion 62.

[0133] As the operating member 50 is positioned at both the first straight-line position G1 and the first rotational position R1, the first straight-line engaging portion 61 engages with the first straight-line engaged portion 71, which is positioned further back than the first straight-line engaging portion 61, and the second straight-line engaging portion 62 engages with the second straight-line engaged portion 72, which is positioned further back than the second straight-line engaging portion 62. The first straight-line engaging portion 61 contacts the front surface of the first straight-line engaged portion 71, and the second straight-line engaging portion 62 contacts the front surface of the second straight-line engaged portion 72, so the operating member 50 cannot move from the first straight-line position G1 to the second straight-line position G2. As a result, the main operation is blocked, and the motor 23 is locked off.

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

[0135] When changing from a locked-off state (blocked state) to a unlocked state (allowed state), the operating member 50 is rotated from the first rotational position R1 to the second rotational position R2 while being maintained at the first straight-line position G1 in the straight-line direction. As the operating member 50 rotates from the first rotational position R1 to the second rotational position R2, the engagement between the first straight-line engaging portion 61 and the first straight-line engaged portion 71 is released, and the engagement between the second straight-line engaging portion 62 and the second straight-line engaged portion 72 is released. Since the first straight-line engaging portion 61 separates from the first straight-line engaged portion 71 and the second straight-line engaging portion 62 separates from the second straight-line engaged portion 72, the operating member 50 can move from the first straight-line position G1 to the second straight-line position G2. As a result, the main operation enters an allowable state, and the motor 23 enters a unlocked state.

[0136] In this embodiment, the second rotation position R2 is the position where the first rotation engaging portion 63 and the first rotation engaged portion 73 are in contact, and the second rotation engaging portion 64 and the second rotation engaged portion 74 are in contact. When the operating member 50 is positioned at the second rotation position R2, the first rotation engaging portion 63 and the first rotation engaged portion 73 are in contact, and the second rotation engaging portion 64 and the second rotation engaged portion 74 are in 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 stopper portions that suppress excessive rotation of the operating member 50. The first rotation engaged portion 73 and the second rotation engaged portion 74 suppress excessive rotation of the operating member 50.

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

[0138] After the operating member 50 is rotated from the first rotation position R1 to the second rotation position R2, when changing from the unlocked state (allowable state) to the ON state, the operating member 50 moves in a straight line from the first straight line position G1 to the second straight line position G2 while being maintained at the second rotation position R2 in the rotation direction. As the operating member 50 moves in a straight line from the first straight line position G1 to the second straight line position G2, the momentary switch 54 is pressed by the switch portion 58 of the operating member 50. With the main operation in the allowable state, the motor 23 is driven and the motor 23 is turned ON as the operating member 50 moves in a straight line to the second straight line position G2 and the momentary switch 54 is pressed.

[0139] When the operating member 50 moves in a straight line from the first straight line position G1 to the second straight line position G2, and then changes from the ON state to the locked-on state (maintained state), 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 line position G2 in the straight line direction. When the operating member 50 is positioned at the second straight line position G2 in the straight line direction and at the first rotation position R1 in the rotation direction, the first straight line engaging portion 61 and the first straight line engaged portion 71 face each other, and the second straight line engaging portion 62 and the second straight line engaged portion 72 face each other. The first straight line engaged portion 71 is positioned in front of the first straight line engaging portion 61, and the second straight line engaged portion 72 is positioned in front of the second straight line engaging portion 62.

[0140] In this embodiment, the coil spring 53 provides a biasing force to the operating member 50 so that it rotates from the second rotation position R2 to the first rotation position R1. As a result, the operating member 50 can rotate smoothly from the second rotation position R2 to the first rotation position R1.

[0141] As the operating member 50 is positioned at the second straight-line position G2 and the first rotation position R1, the first straight-line engaging portion 61 engages with the first straight-line engaged portion 71, which is positioned in front of the first straight-line engaging portion 61, and the second straight-line engaging portion 62 engages with the second straight-line engaged portion 72, which is positioned in front of the second straight-line engaging portion 62. The first straight-line engaging portion 61 contacts the rear surface of the first straight-line engaged portion 71, and the second straight-line engaging portion 62 contacts the rear surface of the second straight-line engaged portion 72, so the operating member 50 cannot move from the second straight-line position G2 to the first straight-line position G1. The operating member 50 is maintained at the second straight-line position G2 in the straight-line direction, rotated from the second rotation position R2 to the first rotation position R1, and then maintained at the second straight-line position G2. As a result, the main operation is maintained, and the motor 23 is locked on.

[0142] When changing from the locked-on state (maintained state) to the locked-off state (blocked state), the operating member 50 is rotated from the first rotation position R1 to the second rotation position R2. As the operating member 50 rotates from the first rotation position R1 to the second rotation position R2, the engagement between the first linear engaging portion 61 and the first linear engaged portion 71 is released, and the engagement between the second linear engaging portion 62 and the second linear engaged portion 72 is released. The momentary switch 54 generates an elastic force that moves the operating member 50 toward the front. That is, the momentary switch 54 applies a biasing force to the operating member 50 so that it returns from the second linear position G2 to the first linear position G1. Therefore, when the engagement between the first straight-line engaging portion 61 and the first straight-line engaged portion 71 is released, and the engagement between the second straight-line engaging portion 62 and the second straight-line engaged portion 72 is released, the operating member 50 can return from the second straight-line position G2 to the first straight-line position G1 in the straight-line direction by the elastic force of the momentary switch 54. In addition, the coil spring 53 provides a biasing force to the operating member 50 so that it rotates from the second rotation position R2 to the first rotation position R1. As a result, the operating member 50 is positioned at the first straight-line position G1 in the straight-line direction and at the first rotation position R1 in the rotation direction. This puts the main operation into an allowable state, and the motor 23 enters a lock-off release state.

[0143] <How to use electric power tools> Next, we will explain how to use the band saw 1. In normal cutting, the user supports the mass of the band saw 1 by gripping the main handle 4 with their dominant hand and the sub-handle 5 with their other hand. By moving the band saw 1 in this state, the user can cut the object to be cut, which is fixed in any position. The chop saw mode and contour mode will be explained below.

[0144] Figure 17 is a diagram illustrating the method of using the band saw 1 according to this embodiment. Figure 17 shows an example of using the band saw 1 in so-called chop saw mode. In chop saw mode, the band saw 1 is used while mounted on the stand 90. Chop saw mode is sometimes also called cutoff mode.

[0145] The stand 90 comprises a base 91, a vise 92, and a support member 93. The vise 92 is supported by the base 91. The vise 92 holds the object to be cut. The vise 92 has 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 that rotatably supports 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 by screws. The band saw 1 is fixed to the support member 93 such that the stand switch mechanism 34 faces upward. The band saw 1 is connected to the stand 90 so as to be able to swing around the hinge 94 from a nearly vertical position (top dead center) to a nearly horizontal position (bottom dead center).

[0147] When cutting an object, the user of the band saw 1 places the object to be cut between the fixed vise 92A and the movable vise 92B, and then rotates the screw 92C so that the movable vise 92B moves closer to the fixed vise 92A. The user of the band saw 1 can move the movable vise 92B closer to the fixed vise 92A by gripping the knob 92E and rotating the screw 92C together with the knob 92E. The object to be cut is then clamped between the fixed vise 92A and the movable vise 92B. This secures the object to be cut to the vise 92.

[0148] After the object to be cut is fixed in the vise 92, the user of the band saw 1 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, for example, holds the sub-handle 5 and 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 object to be cut. The object to be cut is cut when the rotating band saw blade 2 comes into contact with the object to be cut which is fixed in the vise 92. Normally, the user releases their hand from the sub-handle 5 the moment the rotating band saw blade 2 comes into contact with the object to be cut. After that, the cutting operation (lowering of the band saw 1) continues due to the weight of the band saw 1. After the object to be cut 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 illustrating how to use the band saw 1 according to this embodiment. Figure 18 shows an example of using the band saw 1 in so-called contour mode. Even in contour mode, the band saw 1 is used while mounted on the stand 90.

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

[0151] The band saw 1 is fixed to the support member 93 in a nearly vertical position with the stand switch mechanism 34 facing upwards. In 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. The motor 23 drives the band saw blade 2 to rotate. While the band saw blade 2 is rotating, the user of the band saw 1 brings the object on the contour table 95 closer to the band saw blade 2. The object is cut when it comes into contact with the rotating band saw blade 2. 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 comprises a motor 23, a housing 3 housing the motor 23, a rear saw wheel 27 which is an output unit driven by the motor 23, and a stand switch mechanism 34 supported by the housing 3. The stand switch mechanism 34 performs a main operation to drive the motor 23 and a preliminary operation to switch the main operation from a blocked state to an allowed state. The main operation is to move at least a part 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 to move at least a part of the stand switch mechanism 34 in a straight line from the first straight line position G1 to the second straight line position G2. 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, a decrease in the operability of the stand switch mechanism 34 is suppressed. The user of the band saw 1 can easily recognize whether they are performing the main operation or the auxiliary operation by the difference in the operating direction of the main operation and the auxiliary operation. In addition, the main operation is to move at least a part of the stand switch mechanism 34 in a straight line from the first straight line position G1 on the front side of the housing 3 to the second straight line position G2 on the rear side. Therefore, an increase in the size of the band saw 1 is suppressed.

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

[0156] In the above configuration, the operating direction of the maintenance operation, which maintains the main operation, intersects with the operating direction of the main operation. Therefore, the deterioration of the operability of the stand switch mechanism 34 is suppressed. The user of the band saw 1 can easily recognize whether they are performing the main operation or the maintenance operation due to the difference in operating directions between the main operation and the maintenance operation.

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

[0158] In the above configuration, the preparatory operation, main operation, and maintenance operation can be performed continuously and smoothly. Furthermore, since the operating direction of the maintenance operation and the operating direction of the preparatory operation are opposite, the size of the band saw 1 is kept from increasing.

[0159] In this embodiment, the stand switch mechanism 34 has an operating member 50 for performing a preliminary operation. The stand switch mechanism 34 also has an operating member 50 for performing a maintenance operation. The operating member 50 for performing the preliminary operation and the operating member 50 for performing the maintenance operation are the same member.

[0160] In the above configuration, the increase in the number of parts of the stand switch mechanism 34 is suppressed. In addition, the size of the band saw 1 is suppressed.

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

[0162] In the above configuration, the increase in the number of parts of the stand switch mechanism 34 is suppressed. In addition, the size of the band saw 1 is suppressed.

[0163] In this embodiment, the main operation is to move the operating member 50 in a straight line from the first straight line position G1 to the second straight line position G2. The preliminary operation is to rotate the operating member 50 from the first rotation position R1 to the second rotation position R2. The operating member 50 is maintained at the first straight line position G1 in the straight line direction, rotated from the first rotation position R1 to the second rotation position R2, and then moved in a straight line to the second straight line position G2.

[0164] In the above configuration, the decrease in the operability of the stand switch mechanism 34 is suppressed. In addition, the increase in size of the band saw 1 is suppressed.

[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 positioned at a first straight-line position G1 in the straight-line direction and at a first rotational position R1 in the rotational direction, the engaging portion 60 and the engaged portion 70, which is positioned further back than the engaging portion 60, engage, and the main operation is blocked. When the operating member 50 rotates from the first rotational position R1 to the second rotational 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, the operating member 50 is positioned at the first straight-ahead position G1 and the first rotational position R1, so that the engaged portion 70 of the switch case 51 is positioned further back than the engaged portion 60 of the operating member 50. This prevents the main operation. When the operating member 50 is rotated to the second rotational position R2, the engagement between the engaged 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 positioned behind the operating member 50. When the main operation is permitted, the momentary switch 54 is operated when the operating member 50 moves straight to the second straight position G2. The motor 23 is driven when the momentary switch 54 is driven.

[0168] In the above configuration, the use of momentary switch 54 allows for handling high currents.

[0169] In this embodiment, the maintenance operation is the operation of rotating the operating member 50 from the second rotation position R2 to the first rotation position R1. The operating member 50 is maintained in the second straight-line position G2 in the straight-line direction, rotated from the second rotation position R2 to the first rotation position R1, and then maintained in the second straight-line position G2.

[0170] In the above configuration, the decrease in the operability of the stand switch mechanism 34 is suppressed. In addition, the increase in size of the band saw 1 is suppressed.

[0171] In this embodiment, the operating member 50 is positioned at the second straight-line position G2 in the straight-line direction and at the first rotational position R1 in the rotational direction, so that the engaging portion 60 and the engaged portion 70 positioned in front of the engaging portion 60 engage, and the main operation is maintained. When the operating member 50 rotates from the first rotational position R1 to the second rotational 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 causes the operating member 50 to return from the second straight-line position G2 to the first straight-line position G1 in the straight-line direction.

[0172] In the above configuration, the operating member 50 is positioned at the second straight-ahead position G2 and the first rotational position R1, so that the engaging portion 60 of the operating member 50 is positioned 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 rotational position R2, the engagement between the engaging portion 60 and the engaged portion 70 is released. The momentary switch 54 generates an elastic force that returns the operating member 50 from the second straight-ahead position G2 to the first straight-ahead position G1. As the engagement between the engaging portion 60 and the engaged portion 70 is released, the operating member 50 can move from the second straight-ahead position G2 to the first straight-ahead position G1 due to the elastic force of the momentary switch 54. As a result, the motor 23 stops and the main operation is blocked.

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

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

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

[0176] With the above configuration, there is no need to connect the band saw 1 to the commercial power supply with a cable, making it easy to carry the band saw 1 around.

[0177] In this embodiment, the band saw 1 comprises a rear saw wheel 27 which is a first saw wheel, a front saw wheel 28 which is a second saw wheel, and band saw blades 2 which are attached to the rear saw wheel 27 and the front saw wheel 28, respectively. The output unit 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 located between the rear housing 19 and the front housing 20 and houses the motor 23. The stand switch mechanism 34 is supported by the front housing 20.

[0178] In the above configuration, a 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 by the front housing 20 located next to the bridge housing 21, the user of the band saw 1 can smoothly operate the stand switch mechanism 34 when the band saw 1 is mounted on the stand 90.

[0179] [Second Embodiment] A second embodiment will now be described. In this embodiment, the description of components that are the same as or equivalent to those in the first embodiment described above will be simplified or omitted.

[0180] <Stand switch mechanism> Figure 19 is a front perspective view showing the stand switch mechanism 134 according to this embodiment. Figure 20 is an exploded front perspective view showing the stand switch mechanism 134 according to this embodiment. Figure 21 is a rear perspective view showing the stand switch mechanism 134 according to this embodiment. Figure 22 is an exploded rear perspective view 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 sliding portion 158.

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

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

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

[0186] The switch portion 157 has an engaging portion 160. The engaging portion 160 is provided on the upper surface of the switch portion 157. The engaging portion 160 has a straight engaging portion 161 and a sliding engaging portion 162. The straight engaging portion 161 is long in the left-right direction. The sliding engaging portion 162 extends forward from the right end of the straight engaging 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] The plate-like portion 159 is connected to the front of the base portion 180 via the connecting portion 181. The plate-like portion 159 is long in the vertical direction. In the vertical direction, the dimensions of the connecting portion 181 are smaller than the dimensions of the plate-like portion 159. The sliding portion 182 is provided at the rear of the base portion 180. The sliding portion 182 is long in the horizontal direction.

[0189] The switch case 151 movably supports the first operating member 150 and the second operating member 152, respectively. The switch case 151 has an internal space. At least a portion of the first operating member 150 is located in the internal space of the switch case 151. At least a portion of the second operating member 152 is located 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 fastened together by a number 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. Each of the first support hole 163 and the second support hole 164 is provided to connect the external space and the internal space of the switch case 151.

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

[0192] The switch unit 157 is located in the internal space of the switch case 151. The cylindrical unit 156 is located in the external space of the switch case 151.

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

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

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

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

[0197] The coil spring 153 is positioned in a recess 183 provided in the base portion 180. The recess 183 is formed 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. With the coil spring 153 positioned 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 facing 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 it moves to the right.

[0198] The momentary switch 154 is located in the internal space of the switch case 151. The momentary switch 154 is located behind the first operating member 150. The momentary switch 154 is connected to the switch circuit 155. The motor 23 is driven when the momentary switch 154 is operated via the first operating member 150. The motor 23 is driven only for the duration that the momentary switch 154 is pressed by the first operating member 150.

[0199] The first operating member 150 is used to perform the main operation. 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 in a straight line in the front-rear direction while the sliding portion 158 is guided by the guide portion 165. When the first operating member 150 is operated, the first operating member 150 can move in the front-rear direction. In this embodiment, the main operation is to move the first operating member 150 in a straight line from the first straight-line position G1 on the front side of the front housing 20 to the second straight-line position G2 on the rear side. When the first operating member 150 is pushed inward, the momentary switch 154 is pressed.

[0201] 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 left-right. The second operating member 152 can slide left-right while the slide portion 182 is guided by the guide portion 166. By performing a preliminary operation on the second operating member 152, the second operating member 152 can slide left-right. In this embodiment, the preliminary operation is an operation to slide the second operating member 152 from the first slide position S1 to the second slide position S2.

[0202] The operating direction of the maintenance operation intersects with the operating direction of the main operation. In this embodiment, the operating direction of the maintenance operation is left-right. By performing the maintenance operation on the second operating member 152, the second operating member 152 can slide in the left-right direction. In this embodiment, the operating direction of the maintenance operation is the opposite direction to the operating direction of the preliminary operation. The maintenance operation is an operation to slide 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. Figures 23, 24, 25, and 26 are diagrams illustrating the operation of the stand switch mechanism 134 according to this embodiment. Figures 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 (blocking state) to a lock-off release state (allowing state), then through an ON state to a lock-on state (maintaining state). Figure 23 is a view of the stand switch mechanism 134 from the right side. Figure 24 is a view of the stand switch mechanism 134 from the front. Figure 25 is a cross-sectional view taken along the CC line in Figure 23. Figure 26 is a cross-sectional view taken along the DD line in Figure 23.

[0204] As shown in Figures 23 to 26, in the lock-off state (blocked state), the first operating member 150 is positioned at the first straight-line position G1 in the straight-line direction, and the second operating member 152 is positioned at the first sliding position S1 in the sliding direction. With the first operating member 150 positioned at the first straight-line position G1 and the second operating member 152 positioned at the first sliding position S1, the straight-line engaging portion 161 and the straight-line engaged portion 171 face each other. The straight-line engaged portion 171 is positioned further back than the straight-line engaging portion 161.

[0205] With the first operating member 150 positioned at the first straight-ahead position G1 and the second operating member 152 positioned at the first slide position S1, the straight-ahead engaging portion 161 and the straight-ahead engaged portion 171, which is positioned further back than the straight-ahead engaging portion 161, engage. Since the straight-ahead engaging portion 161 contacts the front surface of the straight-ahead engaged portion 171, the first operating member 150 cannot move from the first straight-ahead position G1 to the second straight-ahead position G2. As a result, the main operation is blocked and the motor 23 is locked off.

[0206] When changing from a locked-off state (blocked state) to a unlocked state (allowed state), the first operating member 150 is maintained at the first straight-line position G1 in the straight-line direction, while the second operating member 152 slides from the first slide position S1 to the second slide position S2. As 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. Since the engaging portion 160 separates from the engaged portion 170, the first operating member 150 can move from the first straight-line position G1 to the second straight-line position G2. As a result, the main operation becomes an allowable state, and the motor 23 becomes a unlocked state.

[0207] After the second operating member 152 slides from the first slide position S1 to the second slide position S2, when changing from the unlocked state (allowable state) to the ON state, the first operating member 150 moves in a straight line from the first straight line position G1 to the second straight line position G2 while the second operating member 152 is maintained in the second slide position S2. As the first operating member 150 moves in a straight line from the first straight line position G1 to the second straight line position G2, the momentary switch 54 is pressed by the switch portion 157 of the first operating member 150. With the main operation in the allowable state, the motor 23 is driven and the motor 23 turns ON as the first operating member 150 moves in a straight line to the second straight line position G2 and the momentary switch 54 is pressed.

[0208] When the first operating member 150 moves in a straight line from the first straight line position G1 to the second straight line position G2, and then changes from the ON state to the locked-on state (maintained state), the first operating member 150 is maintained at the second straight line position G2 in the straight line direction, while the second operating member 152 slides from the second slide position S2 to the first slide position S1 in the slide direction. With the first operating member 150 positioned at the second straight line position G2 in the straight line direction and the second operating member 152 positioned at the first slide position S1 in the slide direction, the straight-line engaging portion 161 and the straight-line engaged portion 171 face each other. The straight-line engaged portion 171 is positioned in front of the straight-line engaging portion 161.

[0209] Furthermore, the sliding engagement portion 162 contacts the left end of the straight engagement portion 171, and the sliding engagement portion 172 contacts the right end of the straight engagement portion 161.

[0210] In this embodiment, the coil spring 53 provides a biasing force to the second operating member 152 so that it rotates from the second slide position S2 to the first slide position S1. As a result, the second operating member 152 can slide smoothly from the second slide position S2 to the first slide position S1.

[0211] As the first operating member 150 is positioned at the second straight-line position G2 in the straight-line direction and the second operating member 152 is positioned at the first sliding position S1 in the sliding direction, the straight-line engaging portion 161 and the straight-line engaged portion 171, which is positioned in front of the straight-line engaging portion 161, engage. Since the straight-line engaging portion 161 contacts the rear surface of the straight-line engaged portion 171, the first operating member 150 cannot move from the second straight-line position G2 to the first straight-line position G1. The first operating member 150 is maintained at the second straight-line position G2 in the straight-line direction. As a result, the main operation is maintained and the motor 23 is locked on.

[0212] When changing from the locked-on state (maintained state) to the locked-off state (blocked state), the second operating member 152 slides from the first slide position S1 to the second slide position S2. As 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. The momentary switch 54 generates an elastic force that moves the first operating member 150 toward the front. Due to the elastic force of the momentary switch 154, the first operating member 150 moves from the second straight-line position G2 to the first straight-line position G1 in the straight-line direction. In addition, the coil spring 153 applies a biasing force to the second operating member 152 so that it slides from the second slide position S2 to the first slide position S1. As a result, the first operating member 150 is positioned at the first straight-line position G1 in the straight-line direction, and the second operating member 152 is positioned at the first sliding position S1 in the sliding direction. This allows the main operation to be performed, and the motor 23 is released from lock-off.

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

[0214] In the above configuration, the increase in the number of parts of the stand switch mechanism 134 is suppressed. Furthermore, the complexity of the structure of the stand switch mechanism 134 is suppressed. In addition, the size of the band saw 1 is suppressed.

[0215] In this embodiment, the main operation is to move the first operating member 150 in a straight line from the first straight line position G1 to the second straight line position G2. The preliminary operation is to slide the second operating member 152 from the first slide position S1 to the second slide position S2. The first operating member 150 moves in a straight line to the second straight line position G2 after the second operating member 152 has slid from the first slide position S1 to the second slide position S2.

[0216] In the above configuration, the deterioration of the operability of the stand switch mechanism 134 is suppressed. Furthermore, the complexity of the structure of the stand switch mechanism 134 is suppressed. In addition, the size of the band saw 1 is suppressed.

[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 positioned at a first straight-line position G1 in the straight-line direction and the second operating member 152 is positioned at a first sliding position S1 in the sliding direction, the engaging portion 160 and the engaged portion 170, which is positioned further back than the engaging portion 160, engage, preventing the main operation. 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 main operation becomes permissible.

[0218] In the above configuration, 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 sliding position S1, so that the engaged portion 70 of the second operating member 152 is positioned further back than the engaged portion 60 of the first operating member 150. This prevents the main operation. When the second operating member 152 is slid to the second sliding position S2, the engagement between the engaged portion 160 and the engaged portion 170 is released. This allows the main operation to be performed.

[0219] In this embodiment, the stand switch mechanism 134 has a momentary switch 154 positioned behind the first operating member 150. When the main operation is permitted, the first operating member 150 moves straight to the second straight position G2, and the momentary switch 154 is operated, thereby driving the motor 23.

[0220] In the above configuration, the use of momentary switch 154 allows for handling high currents.

[0221] In this embodiment, the maintenance operation is the operation of sliding the second operating member 152 from the second slide position S2 to the first slide position S1. When the first operating member 150 is positioned at the second straight-line position G2 in the straight-line direction and the second operating member 152 is positioned at the first slide position S1 in the sliding direction, the engaging portion 160 and the engaged portion 170, which is positioned in front of the engaging portion 160, engage, and the main operation is maintained. 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 first operating member 150 moves from the second straight-line position G2 to the first straight-line position G1 in the straight-line direction.

[0222] In the above configuration, the first operating member 150 is positioned at the second straight-ahead position G2 and the second operating member 152 is positioned at the first slide position S1, so that the engaging portion 160 of the first operating member 150 is positioned further back than the engaged portion 170 of the second operating member 152. This maintains the main operation. When the second operating member 152 slides to the second slide position S2, the engagement between the engaging portion 160 and the engaged portion 170 is released. With the engagement between the engaging portion 160 and the engaged portion 170 released, the first operating member 150 can move from the second straight-ahead position G2 to the first straight-ahead position G1. As a result, the motor 23 stops and the main operation is blocked.

[0223] In this embodiment, the second operating member 152 has a plate-shaped portion 159 that is elongated 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 their fingers.

[0225] [Other embodiments] In the above embodiment, the electric work machine 1 is a band saw, which is a type of power tool. Power tools are not limited to band saws. Examples of power tools include screwdrivers, screwdriver drills, angle drills, impact drivers, grinders, hammers, hammer drills, circular saws, and reciprocating saws. The electric work machine 1 may also be an outdoor power tool. Examples of outdoor power tools include chainsaws, hedge trimmers, lawnmowers, brush cutters, and blowers. [Explanation of Symbols]

[0226] 1...Band saw (electric work machine), 2...Band saw blade, 3...Housing, 4...Main handle, 4A...Left handle component, 4B...Right handle component, 4C...Screw, 4D...Opening, 4E...Opening, 4F...Opening, 5...Sub handle, 5A...Left arm section, 5B...Right arm section, 5C...Grip section, 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 (1st saw wheel, output section), 28…Front saw wheel (2nd 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 ​​dial, 36…Light, 37…Controller, 37A…Printed circuit board, 37B…Controller La case, 37C...printed surface, 37D...back of circuit board, 37E...front of controller case, 37F...back 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 section, 57...Small diameter section, 58...Switch section, 59...Plate-shaped section, 60...Engaging section, 61...First straight-line engaging section, 62...Second straight-line engaging section, 63...First rotational engaging section, 64...Second rotational engaging section, 65...Support hole, 66...Hook section, 70...Engaged section, 71...First straight-line engaged section, 71A...Inclined surface, 72...Second straight-line engaged section, 72A...Inclined surface, 73...First rotational engaged section, 74...Second rotational engaged section, 75...Front ring section, 76...Rear ring section, 77...Hook section, 81...First rib section, 82...Second rib section, 83...Third rib section, 84...Fourth rib section, 90...Stand91...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 part, 157...Switch part, 158...Slide part, 159...Plate-shaped part, 160...Engaging part, 1 61...Straight-line engagement part, 162...Slide engagement part, 163...First support hole, 164...Second support hole, 165...Guide part, 166...Guide part, 167...Rib part, 170...Engaged part, 171...Straight-line engaged part, 172...Slide engaged part, 180...Base part, 181...Connecting part, 182...Slide part, 183...Recess, 184...Notch, AX...Motor rotation shaft, CX1...First rotation shaft, CX2...Second rotation shaft, MX...Center shaft, G1...First straight-line position, G2...Second straight-line position, R1...First rotation position, R2...Second rotation position, S1...First slide position, S2...Second slide position.

Claims

1. Motor and, A first saw wheel driven by the aforementioned motor, The second saw wheel, A band saw blade is attached to the first saw wheel and the second saw wheel, A first switch mechanism having a first trigger member which is first operated to drive the motor, and which changes from a first lock-off state in which the first main operation is blocked to a first lock-off release state in which the first lock-off state is released by a first preparatory operation, The device includes a second trigger member which is second primarily operated to drive the motor, and a second switch mechanism which, by a second preliminary operation, changes from a second lock-off state in which the second primary operation is blocked to a second lock-off release state in which the second lock-off state is released, The motor is driven when the first trigger member is operated as the first main trigger and the second trigger member is operated as the second main trigger. Portable band saw.

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

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

4. The sub-handle comprises a left arm portion connected to the left upper part of the second housing, a right arm portion connected to the right upper part of the second housing, and a grip portion connecting the left arm portion and the right arm portion. In the left-right direction, the second trigger member is positioned between the left arm portion and the right arm portion. 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 operating direction of the second trigger member and the preliminary operating direction of the lock-off member intersect. The portable band saw according to claim 5.

7. The main operating direction of the second trigger member and the preliminary operating direction of the lock-off member are orthogonal. The portable band saw according to claim 5.

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

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