Portable band saw

Abstract

This invention provides a portable band saw. The portable band saw includes a first saw wheel, a second saw wheel, a band saw blade, a motor, a controller, and a housing. The band saw blade is mounted on each of the first and second saw wheels. The motor drives the first saw wheel. The controller controls the motor. The housing includes: a first housing housing the first saw wheel; a second housing housing the second saw wheel; and a bridging housing disposed between the first and second housings, housing the motor. The motor's rotation shaft extends in a front-rear direction. At least a portion of the band saw blade is disposed in an opening of the housing, the opening being positioned lower than the bridging housing. The controller is housed in the bridging housing with its surface facing upwards. Accordingly, even if the controller is enlarged, the overall size of the portable band saw can be prevented from increasing.

Description

Technical Field

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

[0002] In the field of portable band saws, a portable band saw disclosed in Patent Document 1 is known.

[0003] [Existing technical documents]

[0004] [Patent Literature]

[0005] Patent Document 1: Japanese Patent Publication No. 2020-138272 Summary of the Invention

[0006] [The technical problem to be solved by this invention]

[0007] Portable band saws have a motor and a controller for controlling the motor. The drive current for driving the motor is supplied to the motor through the controller. Increasing the drive current could lead to a larger controller. A technology is desired that can prevent the overall portable band saw from becoming too large even with a larger controller.

[0008] The purpose of the technology disclosed in this specification is to prevent the overall portable band saw from becoming too large, even if the controller becomes larger.

[0009] [Technical solutions used to solve technical problems]

[0010] This specification discloses a portable band saw. The portable band saw may have a first saw wheel, a second saw wheel, a band saw blade, a motor, a controller, and a housing, wherein the band saw blade is mounted on each of the first and second saw wheels; the motor drives the first saw wheel; and the controller controls the motor. The housing may have a first housing, a second housing, and a bridge housing, wherein the first housing houses the first saw wheel; the second housing houses the second saw wheel; and the bridge housing is disposed between the first and second housings and houses the motor. The motor's rotation shaft may extend in a front-rear direction. At least a portion of the band saw blade may be disposed in an opening of the housing, the opening of which is positioned lower than the bridge housing. The controller may be housed in the bridge housing with its maximum surface facing upwards.

[0011] [Invention Effects]

[0012] According to the technology disclosed in this specification, even with a larger controller, the overall size of the portable band saw can be prevented from increasing. Attached Figure Description

[0013] Figure 1 This is a perspective view of the band saw involved in the embodiment, viewed from the rear.

[0014] Figure 2 This is a perspective view of the band saw involved in the embodiment, viewed from the front.

[0015] Figure 3 This is a diagram showing the band saw involved in the implementation method from the rear.

[0016] Figure 4 This is a diagram showing the band saw involved in the implementation method from the front.

[0017] Figure 5 This is a diagram showing the band saw involved in the implementation method from the left side.

[0018] Figure 6 This is a diagram showing the band saw involved in the implementation method from the right side.

[0019] Figure 7 This is a diagram of the band saw with the rear cover and front cover of the embodiment open, viewed from the right side.

[0020] Figure 8 This is a cross-sectional view of the band saw involved in the implementation method.

[0021] Figure 9 It is an enlarged cross-sectional view of a portion of the band saw involved in the implementation method.

[0022] Figure 10 This is a diagram illustrating the method of using a band saw according to the implementation method.

[0023] Figure 11 This is a diagram illustrating the method of using a band saw according to the implementation method.

[0024] [Explanation of reference numerals in the attached figures]

[0025] 1: Band saw; 2: Band saw blade; 3: Housing; 4: Main handle; 4A: Left handle assembly; 4B: Right handle assembly; 4C: Screw; 4D: Opening; 4E: Opening; 4F: Opening; 5: Sub-handle 5A: Left arm; 5B: Right arm; 5C: Handle; 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: Connecting housing; 22: Opening; 23: Motor; 24: Sensor substrate; 25: Fan; 26: Battery mounting part; 27: Rear saw wheel (first saw wheel; output part); 28: Front saw wheel (second saw wheel); 29: Tension adjustment handle; 30: Rear guide roller; 31: Front guide roller 32: guideroller; 32: stopper plate; 32A: through hole; 33: main switch mechanism; 34: bracket switch mechanism; 35: gear shift dial; 36: lamp; 37: controller; 37A: printed circuit board; 37B: controller housing; 37C: printed surface; 37D: back of the board; 37E: controller housing surface (maximum surface); 37F: back of the controller housing; 37G: rear part (part 1); 37H: front part (part 2); 38: stator; 38A: stator core; 38B: insulator; 38C: coil; 38D: busbar unit; 39: rotor; 39A: rotor core 39B: Permanent magnet; 40: Rotor shaft; 40A: Bearing; 40B: Bearing; 41: Battery pack; 42: Power transmission mechanism; 43: Screw; 44: Trigger operating part; 45: Unlocking operating part; 46: Locking operating part; 47: Switch; 50: Trigger operating part; 51: Switch box; 54: Momentary switch; 55: Switch circuit; 90: Bracket; 91: Base; 92: Vise; 92A: Fixed jaw; 92B: Movable jaw; 92C: Screw; 92D: Support component; 92E: Operating button; 93: Support component; 94: Hinge; 95: Contour table; 101: Wire; 102: Wire; AX: Motor rotating shaft; CX1: First rotating shaft; CX2: Second rotating shaft. Detailed Implementation

[0026] In one or more embodiments, a portable band saw may have a first saw wheel, a second saw wheel, a band saw blade, a motor, a controller, and a housing, wherein the band saw blade is mounted on each of the first and second saw wheels; the motor drives the first saw wheel; and the controller controls the motor. The housing may have a first housing, a second housing, and a bridging housing, wherein the first housing houses the first saw wheel; the second housing houses the second saw wheel; and the bridging housing is disposed between the first and second housings and houses the motor. The motor's rotation shaft may extend in a front-rear direction. At least a portion of the band saw blade may be disposed in an opening of the housing, the opening being positioned lower than the bridging housing. The controller may be housed in the bridging housing with its maximum surface facing upwards.

[0027] In the above structure, since the controller is housed in the bridging housing with its maximum surface facing upwards, even if the controller is enlarged, it is possible to suppress, for example, an increase in the vertical dimension of the bridging housing. Therefore, it is possible to prevent the overall portable band saw from becoming too large.

[0028] In one or more embodiments, the maximum surface of the controller may be tilted relative to the motor rotation axis.

[0029] In the above structure, it is possible to suppress, for example, the dimensional increase of the bridging housing in the front-rear direction.

[0030] In one or more embodiments, the tilt angle of the controller's maximum surface relative to the motor's rotation axis can be greater than 5 degrees and less than 25 degrees.

[0031] The above structure helps to prevent the cross-connect housing from becoming too large. Furthermore, the maximum surface of the controller can be parallel to the motor's rotation axis.

[0032] In one or more embodiments, the controller may be configured above the motor's rotating shaft.

[0033] In the above structure, the enlargement of the bridging housing can be suppressed. Furthermore, the controller can be positioned to the left or right of the motor's rotation axis. The controller can also be positioned below the motor's rotation axis.

[0034] In one or more embodiments, at least a portion of the controller may overlap with the motor in the forward and backward direction.

[0035] In the above structure, it is possible to suppress, for example, the dimensional increase of the bridging housing in the front-rear direction.

[0036] In one or more embodiments, the controller may be configured such that, in the radial direction of the motor's rotating shaft, a first part of the controller is positioned outside the maximum diameter of the motor, and a second part of the controller is positioned inside the maximum diameter of the motor.

[0037] In the above structure, interference between the motor and controller and electronic components other than the motor and controller can be suppressed, thereby suppressing the overall enlargement of the portable band saw.

[0038] In one or more embodiments, the first housing may be disposed at the rear of the bridging housing, and the second housing may be disposed at the front of the bridging housing. The second portion may be disposed at a position further forward than the motor.

[0039] The above structure can suppress interference between the controller and the rotor shaft, thereby preventing the overall portable band saw from becoming too large.

[0040] In one or more embodiments, the portable band saw may have a secondary switching mechanism disposed on the front side of the bridging housing and operated to drive or stop the motor. In the longitudinal direction, at least a portion of the controller may be disposed between the motor and the secondary switching mechanism.

[0041] In the above structure, since at least a portion of the controller is positioned within the dead space between the motor and the auxiliary switching mechanism, the dead space can be effectively utilized. Furthermore, since the wires connecting the motor and the controller are positioned within the dead space, the dead space can be utilized even more effectively.

[0042] In one or more embodiments, the portable band saw may have a main handle and a main switch mechanism, wherein the main handle is disposed on the rear side of the jumper housing and connects the rear of the jumper housing to the first housing; the main switch mechanism is disposed on the main handle and is operated to drive or stop the motor.

[0043] In the above structure, since the auxiliary switch mechanism is located on the front side of the bridging housing and the main handle and main switch mechanism are located on the rear side of the bridging housing, the overall size of the portable band saw can be suppressed.

[0044] In one or more embodiments, the portable band saw may have a speed dial that is configured on the main handle and operated to adjust the rotational speed of the motor.

[0045] In the above structure, since the speed dial is located on the main handle, it is possible to prevent the overall size of the portable band saw from becoming too large.

[0046] In one or more embodiments, the motor may have a rotor and a stator disposed around the rotor. The portable band saw may have a sensor substrate and wires, wherein the sensor substrate supports a magnetic sensor for detecting the rotational direction of the rotor; the wires are used to connect the sensor substrate to a controller. The sensor substrate may be positioned forward of the stator core. The wires may be connected to the lower part of the sensor substrate.

[0047] In the above structure, the proper configuration of the wires improves the assembleability and maintainability of the portable band saw.

[0048] In one or more embodiments, the portable band saw may have a light supported in a cross-mount housing for illuminating the band saw blade positioned at the opening. The light may be positioned forward of the motor.

[0049] In the above structure, since the lamp is positioned on the front side of the motor on the bridging housing, the large size of the bridging housing can be suppressed.

[0050] In one or more embodiments, the portable band saw may have a battery mounting section disposed on the upper part of the bridging housing and housing a battery pack including rechargeable batteries. In the front-rear direction, at least a portion of the controller may overlap with the battery mounting section.

[0051] The above structure can suppress the overall size of the portable band saw in the vertical direction.

[0052] The following is a reference to the appendix. Figure 1 The embodiments of the present invention will be described below, but the present invention is not limited to these embodiments. The structural elements of the embodiments described below can be suitably combined. In addition, some structural elements may not be used at times.

[0053] In this embodiment, a local coordinate system is established on the band saw 1, and the positional relationships of each part are explained with reference to this local coordinate system. An XYZ orthogonal coordinate system is established as the local coordinate system. The direction parallel to the X-axis within a defined plane is defined as the X-axis direction. The direction parallel to the Y-axis orthogonal to the X-axis within the defined plane is defined as the Y-axis direction. The direction parallel to the Z-axis orthogonal to both the X-axis and Y-axis is defined as the Z-axis direction. The defined plane refers to the XY plane. The Z-axis is orthogonal to the defined plane. In this embodiment, the defined plane is assumed to be parallel to the horizontal plane. The X-axis direction is the front-to-back direction; the +X side is the front side, and the -X side is the rear side. The Y-axis direction is the left-to-right direction; the +Y side is the left side, and the -Y side is the right side. The Z-axis direction is the up-to-down direction; the +Z side is the top side, and the -Z side is the bottom side. Furthermore, the direction parallel to each rotation axis of the rear saw wheel 27 (first rotation axis CX1) and the front saw wheel 28 (second rotation axis CX2) is defined as the MS direction, and the direction orthogonal to the MS direction and the front-to-back direction is defined as the KL direction. The up and down directions are inclined relative to the MS and KL directions. 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 down direction and the S direction is 55 degrees. The angle between the right direction and the S direction is 35 degrees.

[0054] [band saw]

[0055] Figure 1 This is a perspective view of the band saw 1 as described in the embodiment, viewed from the rear. Figure 2 This is a perspective view of the band saw 1 as described in the embodiment, viewed from the front. Figure 3 This is a diagram showing the band saw 1 as described in the implementation method from the rear. Figure 4 This is a diagram showing the band saw 1 as described in the embodiment from the front. Figure 5 This is a diagram showing the band saw 1 involved in the implementation method from the left side. Figure 6 This is a diagram showing the band saw 1 involved in the implementation method from the right side.

[0056] The band saw 1 is described as an electric tool that cuts an object by rotating the band saw blade 2. In this embodiment, the band saw 1 is a portable band saw. The user of the band saw 1 is able to move the band saw 1. The user of the band saw 1 is able to cut the object while holding the band saw 1 by hand.

[0057] The band saw 1 has a housing 3, a main handle 4, and a secondary handle 5.

[0058] The housing 3 is longer in the front-to-back direction. The housing 3 includes a rear base 6, a front base 7, a rear cover 8, a front cover 9, a left intermediate cover 10, and a right intermediate cover 11.

[0059] The rear base 6 is positioned further rearward than the front base 7. The rear base 6 is flat. The rear base 6 extends from the rear to the front along the KL direction. The rear cover 8 is positioned on the lower right side (S direction) of the rear base 6. The rear cover 8 is flat. The rear cover 8 extends from the rear to the front along the KL direction. The rear base 6 and the rear cover 8 are configured to overlap parallel to each other. The upper right portion of the rear base 6 and the upper right portion of the rear cover 8 are connected by a hinge 12. The rotation axis of the hinge 12 is parallel to the X-axis. A rear space is formed between the rear base 6 and the rear cover 8.

[0060] The front base 7 is positioned forward of the rear base 6. The front base 7 is flat. The front base 7 extends from the rear to the front along the KL direction. The front cover 9 is positioned on the lower right side (S direction) of the front base 7. The front cover 9 is flat. The front cover 9 extends from the rear to the front along the KL direction. The front base 7 and the front cover 9 are arranged parallel to each other. The upper right portion of the front base 7 is connected to the upper right portion of the front cover 9 by a hinge 13. The rotation axis of the hinge 13 is parallel to the X-axis. A front space is formed between the front base 7 and the front cover 9. Hinges 12 and 13 are coaxially arranged.

[0061] The left center 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 part of the left center cover 10 is fixed to the upper part (upper left) of the rear base 6 by screws 14. The front part of the left center cover 10 is fixed to the upper part (upper left) of the front base 7 by screws 15.

[0062] The right-side center cover 11 is positioned between the upper part of the rear base 6 and the upper part of the front base 7. The rear part of the right-side center cover 11 is fixed to the upper part of the rear base 6 by screws 16. The front part of the right-side center cover 11 is fixed to the upper part of the front base 7 by screws 17.

[0063] The right intermediate cover 11 is positioned to the right of the left intermediate cover 10. The left intermediate cover 10 and the right intermediate cover 11 are secured together by screws 18. An intermediate space is formed between the left intermediate cover 10 and the right intermediate cover 11.

[0064] 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 or magnesium.

[0065] 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.

[0066] The left intermediate cover 10 and the right intermediate cover 11 are each made of synthetic resin. Examples of synthetic resins used to form the left intermediate cover 10 and the right intermediate cover 11 include polycarbonate resin and polyamide resin.

[0067] In the following description, the rear base 6 and the rear cover 8 are suitably referred to as the rear housing 19, the front base 7 and the front cover 9 are suitably referred to as the front housing 20, and the left intermediate cover 10 and the right intermediate cover 11 are suitably referred to as the bridging housing 21.

[0068] In the longitudinal direction, a bridging housing 21 is disposed between the rear housing 19 and the front housing 20. The rear housing 19 is disposed at the rear of the bridging housing 21. The front housing 20 is disposed at the front of the bridging housing 21. The bridging housing 21 is disposed 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 bridging housing 21 and the front part of the rear housing 19 and the rear part of the front housing 20. The opening 22 is positioned lower than the bridging housing 21.

[0069] The main handle 4 is held by the user of the band saw 1. The main handle 4 is configured to connect the rear of the cross-body housing 21 to the rear of the rear base 6. The main handle 4 is located on the rear side of the cross-body housing 21. The main handle 4 has a split design. The main handle 4 includes a left handle component 4A and a right handle component 4B. The left handle component 4A and the right handle component 4B are secured by multiple screws 4C. A handle space is formed between the left handle component 4A and the right handle component 4B.

[0070] The secondary handle 5 is held by the user of the band saw 1. The secondary handle 5 has a left arm portion 5A, a right arm portion 5B, and a grip portion 5C. The left arm portion 5A is connected to the upper left portion of the front base 7; the right arm portion 5B is connected to the upper right portion of the front base 7; and the grip portion 5C connects the left arm portion 5A and the right arm portion 5B. The left arm portion 5A is arranged to extend forward and upward from the upper left portion of the front base 7. The right arm portion 5B is arranged to extend forward and upward from the upper right portion of the front base 7. The grip portion 5C is arranged to connect the upper end of the left arm portion 5A and the upper end of the right arm portion 5B.

[0071] Figure 7 This is a diagram showing the band saw 1 with the rear cover 8 and front cover 9 of the embodiment open, viewed from the right side. Figure 8 This is a cross-sectional view of the band saw 1 according to the embodiment. Figure 9 This is an enlarged cross-sectional view of a portion of the band saw 1 involved in the embodiment.

[0072] like Figures 1 to 9As shown, the band saw 1 includes a motor 23, a sensor substrate 24, a fan 25, a battery mounting part 26, a rear saw wheel 27, a front saw wheel 28, a band saw blade 2, a tension adjustment handle 29, a rear guide roller 30, a front guide roller 31, a stop plate 32, a main switch mechanism 33, a bracket switch mechanism 34, a speed change dial 35, a lamp 36, and a controller 37.

[0073] Motor 23 is the power source for band saw 1. Motor 23 is housed in bridging housing 21. That is, motor 23 is disposed in the intermediate space that is the internal space of bridging housing 21. Motor 23 is disposed at the rear of the intermediate space. Motor 23 is an internal rotor type brushless motor. Motor 23 has a stator 38, a rotor 39, and a rotor shaft 40.

[0074] A stator 38 is arranged around the rotor 39. The stator 38 has a stator core 38A, an insulator 38B, a plurality of coils 38C, and a bus unit 38D, wherein the insulator 38B is fixed to the stator core 38A; the plurality of coils 38C are mounted to the stator core 38A through the insulator 38B; and the bus unit 38D is connected to the plurality of coils 38C. The bus unit 38D is positioned forward of the stator core 38A.

[0075] The rotor 39 has a rotor core 39A and a plurality of permanent magnets 39B, which are fixed to the rotor core 39A.

[0076] The rotor shaft 40 is disposed inside the rotor core 39A. The rotor core 39A is substantially cylindrical. The rotor shaft 40 is fixed to the rotor core 39A. The front portion of the rotor shaft 40 is positioned forward of the stator 38. The rear portion of the rotor shaft 40 is positioned rearward of 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 respectively supported by the bridging housing 21.

[0077] Rotor 39 and rotor shaft 40 rotate around the motor rotation shaft AX. The motor rotation shaft AX is parallel to the X-axis. That is, the motor rotation shaft AX extends in the front-to-back direction.

[0078] The sensor substrate 24 detects the rotational direction of the rotor 39. The sensor substrate 24 is housed within the bridging housing 21. The sensor substrate 24 supports a magnetic sensor for detecting the permanent magnet 39B of the rotor 39. The magnetic sensor detects the rotational direction of the rotor 39 by detecting the magnetic field of the permanent magnet 39B. The sensor substrate 24 is positioned forward of the stator core 38A. The sensor substrate 24 is fixed to the insulator 38B of the stator 38.

[0079] Fan 25 is fixed to the rear of rotor shaft 40. Fan 25 is positioned between bearing 40B and stator core. Fan 25 rotates together with rotor shaft 40. The rotation of fan 25 generates airflow for cooling motor 23 and controller 37.

[0080] The battery mounting section 26 is connected to the battery pack 41. The battery pack 41 is mounted on the battery mounting section 26. The battery mounting section 26 is disposed on the upper part of the bridging 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.

[0081] The power output from the battery pack 41 is supplied to the bus unit 38D of the stator 38 via the controller 37.

[0082] The rear saw wheel 27 is housed within the rear housing 19. That is, the rear saw wheel 27 is positioned in the rear space, which is the interior space of the rear housing 19. A portion of the rear saw wheel 27 protrudes from the opening 8A provided on the rear cover 8. The rear saw wheel 27 is rotatably supported on the rear base 6. The rear saw wheel 27 rotates about a first rotation axis CX1. The first rotation axis CX1 is parallel to the YZ plane. The first rotation axis CX1 is tilted to the left and upward. The first rotation axis CX1 is tilted at an angle of 55 degrees relative to the downward direction.

[0083] The front saw wheel 28 is housed within the front housing 20. That is, the front saw wheel 28 is positioned in the front side space, which is the interior space of the front housing 20. A portion of the front saw wheel 28 protrudes from an opening 9A provided on the front cover 9. The front saw wheel 28 is rotatably supported on the front base 7. The front saw wheel 28 rotates about a second rotation axis CX2. The first rotation axis CX1 is parallel to the second rotation axis CX2. The second rotation axis CX2 is inclined at an angle of 55 degrees relative to the downward direction.

[0084] The band saw blade 2 is mounted on the rear saw wheel 27 and the front saw wheel 28. The band saw blade 2 is annular. The band saw blade 2 is stretched in a forward-backward 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 and right surfaces of the band saw blade 2 are parallel in the area excluding 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 in a manner that changes from a posture parallel to the right surface of the band saw blade 2 to a posture parallel to the XZ plane near the boundary of the opening 22. The twist angle of the band saw blade 2 is 55 degrees.

[0085] like Figure 7As shown, an opening 6A is provided on the right side of the rear base 6. The opening 6A of the rear base 6 is covered by a rear cover 8. The rear cover 8 opens and closes the opening 6A of the rear base 6. An opening 7A is provided on the right side of the front base 7. The opening 7A of the front base 7 is covered by a front cover 9. The front cover 9 opens and closes the opening 7A of the front base 7. When the band saw blade 2 is replaced, both openings 6A and 7A are open.

[0086] 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. As the rotor shaft 40 rotates, the rear saw wheel 27 rotates.

[0087] The rear saw wheel 27 is driven by the motor 23. The rear saw wheel 27 functions as the drive wheel. The front saw wheel 28 functions as the driven wheel. When the rear saw wheel 27 rotates about the first rotation axis CX1 via the motor 23, the band saw blade 2 rotates as each saw wheel is supported by the rear saw wheel 27 and the front saw wheel 28. The front saw wheel 28, with the band saw blade 2 attached, follows the rotation of the rear saw wheel 27 and rotates about the second rotation axis CX2.

[0088] The tension adjustment handle 29 is operated to adjust the tension of the band saw blade 2. The tension adjustment handle 29 is connected to the front saw wheel 28. By operating the tension adjustment handle 29, the front saw wheel 28 moves in the back-and-forth direction. By moving the front saw wheel 28 in the back-and-forth direction, the tension of the band saw blade 2 can be adjusted.

[0089] The rear guide roller 30 guides the band saw blade 2. The rear guide roller 30 is positioned at the front of the rear base 6 facing the opening 22. A pair of rear guide rollers 30 are arranged to clamp the band saw blade 2 from the left and right directions. The rotation axis of the rear guide roller 30 is parallel to the Z-axis.

[0090] The front guide roller 31 guides the band saw blade 2. The front guide roller 31 is positioned at the rear of the front base 7 facing the opening 22. A pair of front guide rollers 31 are arranged to clamp the band saw blade 2 from the left and right directions. The rotation axis of the front guide roller 31 is parallel to the Z-axis.

[0091] A stop plate 32 supports the object being cut. The stop plate 32 is supported at the front of the rear base 6. The band saw blade 2 rotates at the opening 22 in a manner that moves from the front base 7 to the rear base 6. The stop plate 32 prevents the object being cut from moving due to the rotation of the band saw blade 2. The stop plate 32 has a through hole 32A that is longer in the vertical direction. The stop plate 32 is fixed to the rear base 6 by screws 43 that are inserted into the through hole 32A.

[0092] The main switch mechanism 33 is operated to drive or stop the motor 23. The main switch mechanism 33 is disposed on the main handle 4. At least a portion of the main switch mechanism 33 is disposed in the handle space, which is the internal space of the main handle 4.

[0093] The main switch mechanism 33 has a trigger operation component 44, an unlocking operation component 45, a locking operation component 46, and a switch 47.

[0094] The trigger operating member 44 is operated to drive the motor 23. The trigger operating member 44 is disposed on the upper part of the main handle 4. The main handle 4 has an opening 4D on which the trigger operating member 44 is disposed. The opening 4D is disposed on the lower surface of the upper part of the main handle 4. A switch 47 is disposed in the handle space. The switch 47 is operated by pulling the trigger by inserting the trigger operating member 44 into the handle space. By operating the switch 47, the motor 23 is driven.

[0095] The unlocking operation component 45 is activated to change the operation of the trigger operation component 44 from a blocked state to an enabled state. The unlocking operation component 45 is disposed on the upper part of the main handle 4. The main handle 4 has an opening 4E on which the unlocking operation component 45 is disposed. The opening 4E is disposed on the left and right surfaces of the upper part of the main handle 4. By pressing the unlocking operation component 45 in a manner that allows it to enter the handle space, the operation of the trigger operation component 44 is changed from a blocked state to an enabled state.

[0096] Without operation of the unlocking mechanism 45, operation of the trigger mechanism 44 is prevented. The user of the bandsaw 1 cannot operate the trigger mechanism 44 without operation of the unlocking mechanism 45. When the unlocking mechanism 45 is pressed into the handle space, the blocking state is released, allowing operation of the trigger mechanism 44. The user of the bandsaw 1 can pull the trigger mechanism 44 by pressing the unlocking mechanism 45.

[0097] The locking operation member 46 is activated to maintain the pulling operation of the trigger operation member 44. The locking operation member 46 is disposed on the upper part of the main handle 4. The main handle 4 has an opening 4F on which the locking operation member 46 is disposed. The opening 4F is disposed on the upper left surface of the main handle 4. After the trigger operation member 44 is pulled, the locking operation member 46 is pressed in such a way that it enters the handle space, thereby maintaining the pulling operation of the trigger operation member 44.

[0098] After the trigger operating member 44 is pulled, pressing the locking operating member 46 into the handle space maintains the state after the trigger operating member 44 was pulled. After pulling the trigger operating member 44, pressing the locking operating member 46 locks the motor 23 even after releasing the trigger operating member 44. The user of the band saw 1 can press the locking operating member 46 after pulling the trigger operating member 44, thus allowing the motor 23 to continue operating even after removing the finger from the trigger operating member 44.

[0099] That is, before the trigger operating component 44 is pulled, the state is the disconnected state where the motor 23 is stopped. Before the unlocking operating component 45 is pressed, the state is the blocking state that prevents the trigger operating component 44 from being pulled. The blocking state that prevents the trigger operating component 44 from being pulled is the unlocked state where the disconnected state of the motor 23 is fixed. After the unlocking operating component 45 is pressed, the state is the allowed state that allows the trigger operating component 44 to be pulled. After the unlocking operating component 45 is pressed and the trigger operating component 44 is pulled, the state is the activated state that drives the motor 23. After the trigger operating component 44 is pulled and the locking operating component 46 is pressed, the state is the maintained state that sustains the pulling of the trigger operating component 44. The maintained state that sustains the pulling of the trigger operating component 44 is the locked state where the activated state of the motor 23 is fixed. In the locked state, after the finger leaves the trigger operating component 44 and the locking operating component 46, the locked state can be released by pulling the trigger operating component 44 again.

[0100] The bracket switch mechanism 34 is operated to drive or stop the motor 23. The bracket switch mechanism 34 is supported on the upper part of the front housing 20. The bracket switch mechanism 34 has a trigger operating member 50, a switch housing 51, a momentary switch 54, and a switch circuit 55, wherein the switch housing 51 movably supports the trigger operating member 50; the momentary switch 54 is operated via the trigger operating member 50; and the switch circuit 55 is connected to the momentary switch 54. The momentary switch 54 and the switch circuit 55 are housed in the switch housing 51. The bracket switch mechanism 34 is disposed on the front side of the bridging housing 21. At least a portion of the bracket switch mechanism 34 is disposed in a recess 20A formed in the upper part of the front housing 20. At least a portion of the bracket switch mechanism 34 is disposed between the left arm portion 5A and the right arm portion 5B of the auxiliary handle 5.

[0101] The gear shift dial 35 is operated to adjust the rotational speed of the motor 23. The gear shift dial 35 is located on the upper part of the main handle 4.

[0102] Lamp 36 illuminates the object being cut. Additionally, lamp 36 illuminates the band saw blade 2, which is positioned at the opening 22. Lamp 36 is supported by the bridging housing 21. Lamp 36 is located at the lower front of the bridging housing 21.

[0103] 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 from a magnetic sensor mounted on the sensor substrate 24. The controller 37 includes a printed circuit board 37A and multiple electronic components mounted on the printed circuit board. The printed circuit board 37A is supported by a controller housing 37B. The controller housing 37B is a container-shaped structure with a shallow recess, the recess and its outer contour forming a rectangle when viewed from the direction of the recess. The printed circuit board 37A, which is also rectangular and approximately the same shape as the recess, is inserted into the recess. Here, the bottom surface of the controller housing 37B is referred to as the controller housing surface 37E, the surface opposite to the controller housing surface 37E is referred to as the controller housing back surface 37F, the side where the conductor 101 of the printed circuit board 37A extends is referred to as the back surface 37D, and the surface opposite to the back surface 37D is referred to as the printed surface 37C.

[0104] The controller 37 is housed within the bridging housing 21. That is, the controller 37 is disposed in the intermediate space, which is the internal space of the bridging housing 21. The controller 37 is disposed in the upper part of the intermediate space. At least a portion of the controller 37 is disposed above the motor 23. In the XY plane, at least a portion of the motor 23 overlaps with that of the controller 37. The controller 37 is disposed rearward of the bracket switching mechanism 34.

[0105] The controller 37 controls the motor 23 based on an operation signal from at least one of the main switching mechanism 33 and the bracket switching mechanism 34. The electronics of the main switching mechanism 33 and the electronics of the bracket switching mechanism 34 are connected in series.

[0106] When the motor 23 is driven or stopped by operating the main switch mechanism 33, the bracket switch mechanism 34 is in a locked state. The user of the band saw 1 can drive or stop the motor 23 by operating the main switch mechanism 33 while the bracket switch mechanism 34 is locked.

[0107] When the motor 23 is driven or stopped by operating the bracket switch mechanism 34, the main switch mechanism 33 is in a locked state. The user of the band saw 1 can drive or stop the motor by operating the bracket switch mechanism 34 while the main switch mechanism 33 is locked.

[0108] In this embodiment, the largest surface of the controller 37, which has the largest area, is the controller housing surface 37E. Surfaces with areas smaller than the largest surface are, in order, the printed surface 37C, the back surface of the substrate 37D, and the back surface of the controller housing 37F. The controller 37 is housed in the jumper housing 21 with the printed surface 37C and the controller housing surface 37E facing upwards. A battery mounting portion 26 is disposed on the upper side of the controller 37. The controller 37 is housed in the jumper housing 21 with the printed surface 37C and the controller housing surface 37E facing the battery mounting portion 26. The controller 37 is supported by the jumper housing 21.

[0109] In the front-rear direction, at least a portion of the controller 37 overlaps with the battery mounting portion 26. That is, in the front-rear direction, the position of at least a portion of the controller 37 is the same as the position of the battery mounting portion 26.

[0110] The controller housing surface 37E and the printed surface 37C are inclined relative to the motor rotation axis AX. The printed circuit board 37A and the controller housing 37B of the controller 37 are supported on the cross-connect housing 21 with the controller housing surface 37E and the printed surface 37C inclined forward and downward.

[0111] The tilt angle of the controller housing surface 37E relative to the motor rotation axis AX and the tilt angle of the printed surface 37C relative to the motor rotation axis AX are both 5 degrees and less than 25 degrees. In this embodiment, the tilt angle of the controller housing surface 37E relative to the motor rotation axis AX and the tilt angle of the printed surface 37C relative to the motor rotation axis AX are both 13 degrees.

[0112] The controller 37 is positioned above the motor rotation shaft AX. In the vertical direction, the controller 37 is positioned between the battery mounting portion 26 and the motor rotation shaft AX.

[0113] In the front-to-back direction, at least a portion of the controller 37 overlaps with the motor 23. That is, in the front-to-back direction, the position of at least a portion of the controller 37 is the same as the position of the motor 23.

[0114] In one embodiment, at least a portion of the controller 37 overlaps with the stator core 38A of the motor 23 in the longitudinal direction. The position of at least a portion of the controller 37 is identical to the position of the stator core 38A in the longitudinal direction.

[0115] In the radial direction of the motor rotation axis AX, the rear portion 37G (first part) of the controller 37 is positioned outward from the maximum diameter of the motor 23, and the front portion 37H (second part) of the controller 37 is positioned inward from the maximum diameter of the motor 23. That is, in the radial direction of the motor rotation axis AX, the front portion 37H overlaps with the motor 23. In this embodiment, the maximum diameter of the motor 23 includes the outer peripheral surface of the stator core 38A.

[0116] The front portion 37H of the controller 37 is positioned forward of the motor 23. The rear portion 37G of the controller 37 is positioned between the front and rear ends of the stator core 38A in the longitudinal direction.

[0117] In the front-to-back direction, at least a portion of the controller 37 is configured between the motor 23 and the bracket switch mechanism 34.

[0118] The lamp 36 is positioned in front of the motor 23.

[0119] The sensor substrate 24 is connected to the controller 37 via a wire 101. The detection signal from the magnetic sensor mounted on the sensor substrate 24 is transmitted to the controller 37 via the wire 101. The wire 101 is connected to the lower part of the sensor substrate 24.

[0120] Busbar unit 38D is connected to controller 37 via wire 102. Drive current from battery pack 41 is supplied to busbar unit 38D of stator 38 via controller 37 and wire 102.

[0121] How to use an electric work platform

[0122] Next, the method of using the band saw 1 will be explained. In normal cutting, the user holds the main handle 4 of the band saw 1 with their dominant hand and supports the weight of the band saw 1 by holding the auxiliary handle 5 with their other hand. In this state, the band saw 1 is moved to cut the object that is fixed in any position. Furthermore, the chop saw mode and contour cutting mode will be explained below.

[0123] Figure 10 This is a diagram illustrating the method of using the band saw 1 according to this embodiment. Figure 10 This illustrates an example of band saw 1 being used in what is called sawing mode. In sawing mode, band saw 1 is used with its mount on bracket 90. Sawing mode is sometimes referred to as cut-off mode.

[0124] The support 90 has a base 91, a vise 92, and a support member 93. The vise 92 is supported on the base 91. The vise 92 secures the object to be cut. The vise 92 has a fixed jaw 92A, a movable jaw 92B, a screw 92C, a support member 92D, and an operating button 92E. The fixed jaw 92A is fixed to the base 91; the movable jaw 92B faces the fixed jaw 92A; the screw 92C moves the movable jaw 92B; the support member 92D rotatably supports the screw 92C; and the operating button 92E is fixed to the end of the screw 92C. The fixed jaw 92A is sometimes referred to as a fence.

[0125] Support member 93 supports band saw 1. Support member 93 is connected to base 91 via hinge 94. Band saw 1 is fixed to support member 93 by screws. Band saw 1 is fixed to support member 93 such that bracket switching mechanism 34 faces upward. Band saw 1 is connected to bracket 90 such that it can swing from a generally vertical state (top dead center) to a generally horizontal state (bottom dead center) with hinge 94 as the center.

[0126] When cutting an object, the user of the band saw 1 positions the object between the fixed jaw 92A and the movable jaw 92B, then rotates the screw 92C to bring the movable jaw 92B closer to the fixed jaw 92A. The user then rotates the screw 92C together with the operating button 92E by holding the operating button 92E, which brings the movable jaw 92B closer to the fixed jaw 92A. The object is then clamped by the fixed jaw 92A and the movable jaw 92B. Thus, the object is secured in the vise 92.

[0127] After the object to be cut is secured to the vise 92, the user of the band saw 1 operates the support switch mechanism 34 to drive the motor 23. By driving the motor 23, 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 auxiliary handle 5 while swinging 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 is cut by the contact between the rotating band saw blade 2 and the object secured to the vise 92. Typically, the user removes their hand from the auxiliary handle 5 the instant the rotating band saw blade 2 contacts the object. Then, the band saw 1 continues cutting (the band saw 1 descends) due to its own weight. After the object is cut (after swinging to the bottom dead center), the user of the band saw 1 operates the support switch mechanism 34 to stop the motor 23.

[0128] Figure 11 This is a diagram illustrating the method of using the band saw 1 according to this embodiment. Figure 11This illustrates an example of using band saw 1 in so-called contour cutting mode. In contour cutting mode, band saw 1 is also used with its mount on bracket 90.

[0129] The support 90 has a base 91, a vise 92, a support member 93, and a contour cutting table 95. In contour cutting mode, the vise 92 fixes at least a portion of the contour cutting table 95.

[0130] The band saw 1 is fixed to the support member 93 in a generally vertical position so that the bracket switching mechanism 34 faces upward. In contour cutting mode, the hinge 94 is fixed by a stop bolt to prevent the support member 93 from swinging.

[0131] When cutting an object, the user of band saw 1 places the object on the contour cutting table 95 and operates the support 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 band saw 1 brings the object placed on the contour cutting table 95 close to the band saw blade 2. The object is cut by contact with the rotating band saw blade 2. After the object is cut, the user of band saw 1 operates the support switch mechanism 34 to stop the motor 23.

[0132] [Effect]

[0133] As described above, in this embodiment, the portable band saw 1 includes: a rear saw wheel 27 as a first saw wheel; a front saw wheel 28 as a second saw wheel; a band saw blade 2, which is mounted on each of the rear saw wheel 27 and the front saw wheel 28; a motor 23 for driving the rear saw wheel 27; a controller 37 for controlling the motor 23; and a housing 3. The housing 3 includes: a rear housing 19, which serves as a first housing and houses the rear saw wheel 27; a front housing 20, which serves as a second housing and houses the front saw wheel 28; and a bridging housing 21, which is disposed between the rear housing 19 and the front housing 20 and houses the motor 23. The motor rotation shaft AX extends in the front-rear direction. At least a portion of the band saw blade 2 is disposed in the opening 22 of the housing 3, which is positioned lower than the bridging housing 21. The controller 37 is housed in the bridging housing 21 with the controller housing surface 37E, which is the largest surface of the controller 37, facing upward.

[0134] In the above structure, since the controller 37 is housed in the bridging housing 21 with the controller housing surface 37E, which is the largest surface of the controller 37, facing upwards, even if the controller 37 is enlarged, it is possible to suppress, for example, an increase in the size of the bridging housing 21 in the vertical direction. Therefore, it is possible to suppress an increase in the size of the entire band saw 1.

[0135] In one embodiment, the controller housing surface 37E, which is the largest surface of the controller 37, is inclined relative to the motor rotation axis AX.

[0136] In the above structure, it is possible to suppress, for example, the increase in the size of the bridging housing 21 in the front-rear direction.

[0137] In the embodiment, the tilt angle of the controller housing surface 37E, which is the largest surface of the controller 37, relative to the motor rotation axis AX is more than 5 degrees and less than 25 degrees.

[0138] In the above structure, the enlargement of the bridging housing 21 can be suppressed.

[0139] In one embodiment, the controller 37 is positioned above the motor's rotating shaft AX.

[0140] In the above structure, the enlargement of the bridging housing 21 can be suppressed.

[0141] In one embodiment, at least a portion of the controller 37 overlaps with the motor 23 in the front-to-back direction.

[0142] In the above structure, it is possible to suppress, for example, the increase in the size of the bridging housing 21 in the front-rear direction.

[0143] In the embodiment, in the radial direction of the motor rotation shaft AX, the rear portion 37G, which is the first part of the controller 37, is positioned outside the maximum diameter of the motor 23, and the front portion 37H, which is the second part of the controller 37, is positioned inside the maximum diameter of the motor 23.

[0144] In the above structure, interference between the motor 23 and the controller 37 and electronic material components other than the motor 23 and the controller 37 can be suppressed, thereby suppressing the enlargement of the entire band saw 1.

[0145] In this embodiment, the rear housing 19 is disposed on the rear side of the bridging housing 21, and the front housing 20 is disposed on the front side of the bridging housing 21. The front portion 37H is disposed at a position forward of the motor 23.

[0146] In the above structure, interference between the controller 37 and the rotor shaft 40 can be suppressed, thereby suppressing the enlargement of the entire band saw 1.

[0147] In one embodiment, the band saw 1 has a bracket switch mechanism 34 as a secondary switch mechanism, which is disposed on the front side of the bridging housing 21 and operated to drive or stop the motor 23. In the longitudinal direction, at least a portion of the controller 37 is disposed between the motor 23 and the bracket switch mechanism 34.

[0148] In the above structure, since at least a portion of the controller 37 is positioned within the dead zone between the motor 23 and the bracket switch mechanism 34, the dead zone can be effectively utilized. Furthermore, by positioning the wire 102 connecting the motor 23 and the controller 37 within the dead zone, the dead zone can be utilized even more effectively.

[0149] In one embodiment, the band saw 1 has a main handle 4 and a main switch mechanism 33, wherein the main handle 4 is disposed on the rear side of the bridging housing 21 and connects the rear part of the bridging housing 21 to the rear housing 19; the main switch mechanism 33 is disposed on the main handle 4 and is operated to drive or stop the motor 23.

[0150] In the above structure, since the bracket switch mechanism 34 is arranged on the front side of the bridging housing 21 and the main handle 4 and the main switch mechanism 33 are arranged on the rear side of the bridging housing 21, the overall enlargement of the band saw 1 can be suppressed.

[0151] In one embodiment, the band saw 1 has a speed dial 35, which is disposed on the main handle 4 and operated to adjust the rotational speed of the motor 23.

[0152] In the above structure, since the speed change dial 35 is configured on the main handle 4, it is possible to prevent the overall band saw 1 from becoming too large.

[0153] In this embodiment, the motor 23 has a rotor 39 and a stator 38 disposed around the rotor 39. The band saw 1 has a sensor substrate 24 and a wire 101. The sensor substrate 24 supports a magnetic sensor for detecting the rotational direction of the rotor 39; the wire 101 is used to connect the sensor substrate 24 to the controller 37. The sensor substrate 24 is positioned forward of the stator core 38A of the stator 38. The wire 101 is connected to the lower part of the sensor substrate 24.

[0154] In the above structure, the assemblability and maintainability of the band saw 1 are improved because the wire 101 is properly configured.

[0155] In one embodiment, the band saw 1 has a lamp 36 supported by a bridging housing 21 for illuminating the band saw blade 2 disposed in the opening 22. The lamp 36 is positioned forward of the motor 23.

[0156] In the above structure, since the lamp 36 is arranged in front of the motor 23 in the bridging housing 21, the enlargement of the bridging housing 21 can be suppressed.

[0157] In one embodiment, the band saw 1 has a battery mounting portion 26 disposed on the upper part of the bridging housing 21, and a battery pack 41 including a rechargeable battery is mounted thereon. In the front-rear direction, at least a portion of the controller 37 overlaps with the battery mounting portion 26.

[0158] In the above structure, the enlargement of the entire band saw 1 in the vertical direction can be suppressed.

[0159] [Other Implementation Methods]

[0160] In the above embodiments, the controller housing surface 37E, which is the largest surface of the controller 37, can be parallel to the motor rotation axis AX. The controller housing surface 37E, which is the largest surface of the controller 37, can be parallel to the XY plane. The controller housing surface 37E, which is the largest surface of the controller 37, can be parallel to the ZX plane.

[0161] In the above embodiments, the controller 37 can be configured to the left or right of the motor rotation axis AX. The controller 37 can also be configured to the lower side of the motor rotation axis AX.

Claims

1. A portable band saw, characterized in that, It comprises a first saw wheel, a second saw wheel, a band saw blade, a motor, a controller, and a housing, wherein, The second saw wheel is positioned further forward than the first saw wheel; The band saw blade is attached to each of the first and second saw wheels; The motor is used to drive the first saw wheel; The controller is used to control the motor; The housing comprises a first housing, a second housing, and a bridging housing. The first housing houses the first saw wheel. The second housing is positioned forward of the first housing and houses the second saw wheel. The bridging housing is positioned between the first and second housings in the longitudinal direction and houses the motor. The bridging housing is configured to connect the upper part of the first housing to the upper part of the second housing. An opening is provided between the lower part of the bridging housing, the front part of the first housing, and the rear part of the second housing. The opening is positioned below the cross-connect housing. The motor's rotating shaft extends in the front-to-back direction. The first saw wheel rotates around a first rotating axis that is inclined to the left and upward. The second saw wheel rotates around a second rotation axis that is parallel to the first rotation axis. At least a portion of the band saw blade is disposed in the opening. The controller is housed in the bridging housing with its largest surface facing upwards.

2. The portable band saw according to claim 1, characterized in that, The largest surface of the controller is inclined forward and downward relative to the rotation axis of the motor.

3. The portable band saw according to claim 2, characterized in that, The maximum surface of the controller is tilted at an angle of more than 5 degrees and less than 25 degrees relative to the motor rotation axis.

4. The portable band saw according to any one of claims 1 to 3, characterized in that, The controller is positioned above the motor's rotating shaft.

5. The portable band saw according to any one of claims 1 to 3, characterized in that, In the front-to-back direction, at least a portion of the controller overlaps with the motor.

6. The portable band saw according to any one of claims 1 to 3, characterized in that, In the radial direction of the motor's rotating shaft, the first part of the controller is configured to be located outside the maximum diameter of the motor, and the second part of the controller is configured to be located inside the maximum diameter of the motor.

7. The portable band saw according to claim 6, characterized in that, The first housing is disposed on the rear side of the bridging housing. The second housing is disposed on the front side of the bridging housing. The second part is positioned further forward than the motor.

8. The portable band saw according to claim 7, characterized in that, It has a secondary switching mechanism, which is disposed on the front side of the jumper housing and is operated to drive or stop the motor. In the forward and backward direction, at least a portion of the controller is configured between the motor and the auxiliary switching mechanism.

9. The portable band saw according to claim 8, characterized in that, It has a main handle and a main switch mechanism, wherein, The main handle is disposed on the rear side of the jumper housing and is used to connect the rear part of the jumper housing to the first housing; The main switch mechanism is configured on the main handle and is operated to drive or stop the motor.

10. The portable band saw according to claim 9, characterized in that, It has a speed dial that is configured on the main handle and operated to adjust the rotational speed of the motor.

11. The portable band saw according to claim 6, characterized in that, The motor has a rotor and a stator disposed around the rotor. The portable band saw has a sensor substrate and wires, wherein the sensor substrate supports a magnetic sensor for detecting the position of the rotor's rotation direction; the wires are used to connect the sensor substrate to the controller. The sensor substrate is positioned on the stator at a position forward of the stator core. The wire is connected to the lower part of the sensor substrate.

12. The portable band saw according to any one of claims 7 to 10, characterized in that, The motor has a rotor and a stator disposed around the rotor. The portable band saw has a sensor substrate and wires, wherein the sensor substrate supports a magnetic sensor for detecting the position of the rotor's rotation direction; the wires are used to connect the sensor substrate to the controller. The sensor substrate is positioned on the stator at a position forward of the stator core. The wire is connected to the lower part of the sensor substrate.

13. The portable band saw according to claim 6, characterized in that, It includes a lamp, which is supported by the bridging housing, for illuminating the band saw blade disposed in the opening. The lamp is positioned in front of the motor.

14. The portable band saw according to any one of claims 7 to 11, characterized in that, It includes a lamp, which is supported by the cross-connect housing, for illuminating the band saw blade disposed in the opening. The lamp is positioned in front of the motor.

15. The portable band saw according to any one of claims 1 to 3, characterized in that, It has a battery mounting section disposed on the upper part of the jumper housing for mounting a battery pack including rechargeable batteries. In the front-to-back direction, at least a portion of the controller overlaps with the battery mounting portion.

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