Portable band saw

Abstract

To cut a cutting object into a desired shape.SOLUTION: A portable band saw comprises: a first saw wheel; a second saw wheel located in the front of the first saw wheel; a motor for rotating at least one of the first saw wheel and the second saw wheel; a body part which supports the first saw wheel, the second saw wheel and motor respectively, and has a recess; a band saw blade which is hung on the first saw wheel and the second saw wheel respectively, and cuts a cutting object in the recess; and a guide plate which supports the cutting object. The guide plate has a top face contact part which contacts a top face of the cutting object. The guide plate is so supported on the body part as to be capable of oscillating around an oscillation support shaft so that the guide plate moves from an outer side to an inner side of the recess in the state the top contact part is brought into contact with the top face of the cutting object.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A portable band saw includes a stopper plate mechanism that supports an object to be cut and a band saw blade that cuts the object to be cut. If the object to be cut cannot be properly supported, it becomes difficult to cut the object to be cut into a desired shape. For example, when the object to be cut is a pipe, if the pipe cannot be properly supported, the cut surface of the pipe may be inclined with respect to the central axis of the pipe.

[0005] The technology disclosed in this specification aims to cut an object to be cut into a desired shape.

Means for Solving the Problems

[0006] This specification discloses a portable band saw. The portable band saw includes a first saw wheel, a second saw wheel disposed in front of the first saw wheel, a motor that rotates at least one of the first saw wheel and the second saw wheel, a main body portion that supports each of the first saw wheel, the second saw wheel, and the motor and has a recess, a band saw blade that is wound around each of the first saw wheel and the second saw wheel and cuts a cutting target in the recess, and a guide plate that supports the cutting target. The guide plate may have an upper surface contact portion that contacts the upper surface of the cutting target. The guide plate may be swingably supported by the main body portion about a swing support shaft so as to move from the outside to the inside of the recess with the upper surface contact portion contacting the upper surface of the cutting target.

Effect of the Invention

[0007] According to the technology disclosed in this specification, a cutting target can be cut into a desired shape.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, the portable band saw may include a first saw wheel, a second saw wheel disposed in front of the first saw wheel, a motor that rotates at least one of the first saw wheel and the second saw wheel, a main body portion that supports each of the first saw wheel, the second saw wheel, and the motor and has a recess, a band saw blade that is wound around each of the first saw wheel and the second saw wheel and cuts the object to be cut in the recess, and a guide plate that supports the object to be cut. The guide plate may have an upper surface contact portion that contacts the upper surface of the object to be cut. The guide plate may be swingably supported by the main body portion about a swing support shaft so as to move from the outside to the inside of the recess with the upper surface contact portion contacting the upper surface of the object to be cut.

[0010] In the above configuration, since the guide plate has an upper surface contact portion that contacts the upper surface of the object to be cut, the object to be cut is suppressed from tilting in the left-right direction. The portable band saw can cut the object to be cut into a desired shape in a state where the tilt of the object to be cut is suppressed. For example, when the object to be cut is a pipe, the portable band saw can cut the pipe so that the cut surface of the pipe is perpendicular to the central axis of the pipe. Also, since the guide plate swings, the user can easily operate the main body portion.

[0011] In one or more embodiments, the axis of the swing support shaft may extend in the left-right direction.

[0012] In the above configuration, even if the main body portion and the guide plate swing relative to each other, the object to be cut is stably supported by the guide plate.

[0013] In one or more embodiments, the swing support shaft may be provided on the main body portion between the concave portion and the rear end portion of the main body portion.

[0014] In the above configuration, when the user relatively swings the main body portion and the guide plate, the main body portion is easy to operate. In addition, the increase in size of the portable band saw is suppressed.

[0015] In one or more embodiments, when the direction parallel to the rotation axis of the motor is defined as the first predetermined direction (MS direction) and the direction orthogonal to each of the first predetermined direction and the front-rear direction is defined as the second predetermined direction (KL direction), the swing support shaft may be provided on the side surface of the main body portion closer to the open portion of the band saw blade than the center of the main body portion in the second predetermined direction.

[0016] In the above configuration, the increase in size and complexity of the guide plate is suppressed.

[0017] In one or more embodiments, the swing support shaft may be provided on the rear side of the concave portion. The band saw blade may travel from the front side to the rear side in the concave portion. The guide plate may have a rear surface contact portion that contacts the rear surface of the object to be cut.

[0018] In the above configuration, the guide plate can support the object to be cut that tends to move rearward due to the travel of the band saw blade with the rear surface contact portion.

[0019] In one or more embodiments, the guide plate may have a bent portion that connects the rear end portion of the upper surface contact portion and the upper end portion of the rear surface contact portion.

[0020] In the above configuration, since the guide plate has the upper surface contact portion and the rear surface contact portion, the object to be cut is stably supported by the guide plate.

[0021] In one or more embodiments, the angle formed by the upper surface contact portion and the rear surface contact portion may be 80 degrees or more and 100 degrees or less.

[0022] In the above configuration, when the object to be cut is a round material or a square material, the guide plate can stably support the object to be cut.

[0023] In one or more embodiments, the portable band saw may include a swing plate fixed to the guide plate. The swing plate may be swingably supported on the main body about a swing support shaft. An arc-shaped guide hole may be provided in the swing plate. The portable band saw may include a guide shaft inserted into the guide hole and fixed to the main body.

[0024] In the above configuration, the guide plate can swing while being guided by the guide shaft.

[0025] In one or more embodiments, the upper surface contact portions may be respectively disposed on the right side and the left side of the band saw blade.

[0026] In the above configuration, the upper surface contact portions can support the object to be cut on the right side and the left side of the band saw blade respectively.

[0027] In one or more embodiments, the rear surface contact portions may be respectively disposed on the right side and the left side of the band saw blade.

[0028] In the above configuration, the rear surface contact portions can support the object to be cut on the right side and the left side of the band saw blade respectively.

[0029] In one or more embodiments, the portable band saw may include a spring that generates an elastic force so that the guide plate moves from the inside to the outside of the concave portion.

[0030] In the above configuration, the guide plate can return to the initial position outside the concave portion by the elastic force of the spring.

[0031] In one or more embodiments, the guide plate may be made of metal.

[0032] In the above configuration, the guide plate can maintain the required strength. Steel or aluminum is exemplified as the metal forming the guide plate.

[0033] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. Also, some components may not be used.

[0034] [Portable band saw] FIG. 1 is a perspective view showing a portable band saw 1 according to an embodiment. As shown in FIG. 1, the portable band saw 1 includes a battery mounting portion 24 on which a battery 26 is mounted, a motor 20 driven by electric power from the battery 26, an endless band saw blade 12 that rotates by the power generated by the motor 20 and cuts a cutting target W, a main body portion 10 that supports each of the motor 20 and the band saw blade 12, and a handle 22 connected to the main body portion 10. The handle 22 has a support portion 60 connected to the main body portion 10 and a grip portion 62 connected to the support portion 60. The portable band saw 1 also includes a guide mechanism 14 for guiding the cutting target W and a tension adjustment mechanism 18 for adjusting the tension of the band saw blade 12.

[0035] In the embodiment, the positional relationships of the respective parts are described using the terms "left", "right", "front", "rear", "upper", and "lower". These terms indicate relative positions or directions based on the center of the portable band saw 1.

[0036] The support portion 60 extends in the vertical direction. The grip portion 62 extends in the front-rear direction. The longitudinal direction of the support portion 60 is defined as the vertical direction, the longitudinal direction of the grip portion 62 is defined as the front-rear direction, and the direction orthogonal to each of the vertical direction and the front-rear direction is defined as the left-right direction.

[0037] The upper side is one side in the vertical direction, and the lower side is the other side in the vertical direction. The front side is one side in the front-rear direction, and the rear side is the other side in the front-rear direction. The left side is one side in the left-right direction, and the right side is the other side in the left-right direction. In the embodiment, the direction in which the support portion 60 protrudes from the main body portion 10 is the upper side. The direction in which the battery mounting portion 24 is arranged with respect to the handle 22 is the rear side. The direction in which the band saw blade 12 is arranged with respect to the handle 22 is the left side.

[0038] Also, the direction parallel to the rotation axis MX of the motor 20 is defined as the MS direction (first predetermined direction). The direction orthogonal to each of the MS direction and the front-rear direction is defined as the KL direction (second predetermined direction). The vertical direction is inclined with respect to each of the MS direction and the KL direction. The M side is one side of the MS direction, and the S side is the other side of the MS direction. The K side is one side of the KL direction, and the L side is the other side of the KL direction. In the embodiment, the direction in which the motor 20 protrudes from the main body portion 10 is the M side. The direction in which the band saw blade 12 is arranged with respect to the handle 22 is the L side.

[0039] FIG. 2 is a view of the portable band saw 1 according to the embodiment as seen from the M side. FIG. 3 is a view of the portable band saw 1 according to the embodiment as seen from the L side. FIG. 4 is a view of the portable band saw 1 according to the embodiment as seen from the front side.

[0040] As shown in FIGS. 2, 3, and 4, the main body portion 10 is long in the front-rear direction. The outer shape of the main body portion 10 is oval or elliptical. The main body portion 10 includes a frame 30 and a cover 32. The frame 30 is arranged on the M side with respect to the cover 32. The frame 30 is formed of a light metal such as aluminum or magnesium. In the embodiment, the frame 30 is made of aluminum die-cast. The frame 30 has a surface 30f orthogonal to the MS direction.

[0041] The cover 32 covers the frame 30. The cover 32 is disposed on the S side of the frame 30. The cover 32 is attached to the frame 30 via a hinge portion. The cover 32 is openable and closable with respect to the frame 30. The cover 32 is made of a synthetic resin such as polycarbonate or polyamide.

[0042] An internal space of the main body 10 is formed between the frame 30 and the cover 32. At least a part of the band saw blade 12 is disposed in the internal space of the main body 10. The frame 30 rotatably supports the band saw blade 12.

[0043] The frame 30 supports the motor 20. The motor 20 is disposed on the frame 30. The handle 22 is connected to the surface 30f of the frame 30. The tension adjusting mechanism 18 is disposed on the frame 30.

[0044] The main body 10 has a recess 10n. The recess 10n is provided at the central portion of the main body 10 in the front-rear direction. The recess 10n is provided at the L-side end of the main body 10 in the KL direction.

[0045] At least a part of the band saw blade 12 is disposed in the recess 10n. The band saw blade 12 is disposed in the external space (open portion) of the main body 10 in the recess 10n.

[0046] The cutting target W of the portable band saw 1 can enter the inside of the recess 10n. The band saw blade 12 cuts the cutting target W in the recess 10n. The band saw blade 12 can cut the cutting target W inside the recess 10n. In the following description, a part of the band saw blade 12 disposed in the recess 10n is appropriately referred to as a cutting portion 12c.

[0047] The cutting portion 12c of the band saw blade 12 cuts the cutting target W. The cutting portion 12c is disposed in the external space of the main body 10.

[0048] FIG. 5 is a view of the portable band saw 1 according to the embodiment as seen from the S side. FIG. 5 shows the portable band saw 1 with the cover 32 removed from the frame 30. FIG. 6 is a view of the portable band saw 1 according to the embodiment as seen from the S side.

[0049] As shown in FIG. 5, the frame 30 has a vertical wall portion 30a that defines the outer peripheral portion of the frame 30 and a notch portion 30n.

[0050] The vertical wall portion 30a has a straight portion 30p, a first curved portion 30g, a second curved portion 30r, a third curved portion 30s, and a fourth curved portion 30t.

[0051] The straight portion 30p is disposed on the K side of the vertical wall portion 30a. The straight portion 30p extends in the front-rear direction.

[0052] The first curved portion 30g is disposed on the rear side of the vertical wall portion 30a. The first curved portion 30g is connected to the rear end portion of the straight portion 30p. The first curved portion 30g curves so as to protrude rearward.

[0053] The second curved portion 30r is disposed on the front side of the vertical wall portion 30a. The second curved portion 30r is connected to the front end portion of the straight portion 30p. The second curved portion 30r curves so as to protrude forward.

[0054] The third curved portion 30s is disposed so as to connect the first curved portion 30g and the notch portion 30n. The third curved portion 30s is connected to the L-side end portion of the first curved portion 30g. The third curved portion 30s curves so as to protrude to the L side.

[0055] The fourth curved portion 30t is disposed so as to connect the second curved portion 30r and the notch portion 30n. The fourth curved portion 30t is connected to the L-side end portion of the second curved portion 30r. The fourth curved portion 30t curves so as to protrude to the L side.

[0056] As shown in FIG. 6, the cover 32 has a vertical wall portion 32a and a notch portion 32n. The vertical wall portion 32a of the cover 32 is disposed at a position corresponding to the vertical wall portion 30a of the frame 30. The notch portion 32n of the cover 32 is disposed at a position corresponding to the notch portion 30n of the frame 30.

[0057] In a state where the cover 32 is closed, the vertical wall portion 30a of the frame 30 and the vertical wall portion 32a of the cover 32 overlap. In a state where the cover 32 is closed, the notch portion 30n of the frame 30 and the notch portion 32n of the cover 32 overlap. The recess 10n of the main body portion 10 is formed by the notch portion 30n of the frame 30 and the notch portion 32n of the cover 32.

[0058] The vertical wall portion 32a has a straight portion 32p, a first curved portion 32g, a second curved portion 32r, a third curved portion 32s, and a fourth curved portion 32t.

[0059] In a state where the cover 32 is closed, the straight portion 32p of the cover 32 and the straight portion 30p of the frame 30 overlap. In a state where the cover 32 is closed, the first curved portion 32g of the cover 32 and the first curved portion 30g of the frame 30 overlap. In a state where the cover 32 is closed, the second curved portion 32r of the cover 32 and the second curved portion 30r of the frame 30 overlap. In a state where the cover 32 is closed, the third curved portion 32s of the cover 32 and the third curved portion 30s of the frame 30 overlap. In a state where the cover 32 is closed, the fourth curved portion 32t of the cover 32 and the fourth curved portion 30t of the frame 30 overlap.

[0060] As shown in FIG. 6, the frame 30 has a lock portion 30d. The cover 32 has a lock portion 32d that is fixed to the lock portion 30d. By fixing the lock portion 30d and the lock portion 32d, the closed state of the cover 32 is maintained.

[0061] The handle 22 is supported by the frame 30 of the main body portion 10. The handle 22 includes a support portion 60 and a grip portion 62. The support portion 60 extends in the vertical direction. The grip portion 62 is gripped by a user. The grip portion 62 extends in the front-rear direction.

[0062] The battery mounting portion 24 has connection terminals to which the power terminals of the battery 26 are connected. When the battery 26 is mounted on the battery mounting portion 24, power is supplied from the battery 26 to the portable band saw 1. The battery mounting portion 24 is disposed at the rear portion of the handle 22.

[0063] As shown in FIG. 5, the frame 30 supports the first saw blade wheel 40 and the second saw blade wheel 42, respectively. Each of the first saw blade wheel 40 and the second saw blade wheel 42 is disposed in the internal space of the main body 10. Each of the first saw blade wheel 40 and the second saw blade wheel 42 supports the band saw blade 12. The second saw blade wheel 42 is disposed forward of the first saw blade wheel 40.

[0064] The band saw blade 12 is an endless saw blade. The band saw blade 12 is made of metal. The band saw blade 12 is hung on each of the first saw blade wheel 40 and the second saw blade wheel 42. The band saw blade 12 is hung on each of the first saw blade wheel 40 and the second saw blade wheel 42 in a state of being pulled in the front-rear direction by the tension adjusting mechanism 18.

[0065] The first saw blade wheel 40 rotates about the rotation axis BX. The second saw blade wheel 42 rotates about the rotation axis CX. Each of the rotation axis BX and the rotation axis CX is parallel to the rotation axis MX of the motor 20. The rotation axis BX of the first saw blade wheel 40 coincides with the rotation axis MX of the motor 20.

[0066] The motor 20 generates power to rotate at least one of the first saw blade wheel 40 and the second saw blade wheel 42. In the embodiment, the motor 20 generates power to rotate the first saw blade wheel 40. When the motor 20 is driven, the first saw blade wheel 40 rotates. With the band saw blade 12 hung on each of the first saw blade wheel 40 and the second saw blade wheel 42, when the first saw blade wheel 40 rotates, the band saw blade 12 rotates. When the band saw blade 12 rotates, the second saw blade wheel 42 rotates. The second saw blade wheel 42 rotates so as to follow the first saw blade wheel 40. When the motor 20 is driven and the first saw blade wheel 40 rotates, the band saw blade 12 rotates while being supported by each of the first saw blade wheel 40 and the second saw blade wheel 42.

[0067] The frame 30 has a guide portion 44 for guiding the band saw blade 12. The guide portion 44 includes a first guide portion 44a disposed on the front side of the notch portion 30n and a second guide portion 44b disposed on the rear side of the notch portion 30n. Each of the first guide portion 44a and the second guide portion 44b has a pair of rollers that sandwich the band saw blade 12. The guide portion 44 guides the band saw blade 12 so as to twist it in the concave portion 10n. In the embodiment, the guide portion 44 guides the band saw blade 12 such that the surface of the cutting portion 12c of the band saw blade 12 is parallel to the vertical direction.

[0068] In the embodiment, the band saw blade 12 rotates in the concave portion 10n such that the cutting portion 12c moves to the rear side. The band saw blade 12 travels from the front side to the rear side in the concave portion 10n.

[0069] As shown in FIG. 6, the cover 32 has an opening 32b in which at least a part of the first saw wheel 40 is disposed and an opening 32c in which at least a part of the second saw wheel 42 is disposed. At least a part of the first saw wheel 40 is exposed from the opening 32b. At least a part of the second saw wheel 42 is exposed from the opening 32c.

[0070] FIG. 7 is a cross-sectional view of the portable band saw 1 according to the embodiment as viewed from the L side. As shown in FIG. 7, the tension adjusting mechanism 18 is provided in the main body portion 10. The tension adjusting mechanism 18 adjusts the tension of the band saw blade 12. The tension adjusting mechanism 18 is disposed forward of the concave portion 10n. The tension adjusting mechanism 18 has a lever 18a, a cam 18b, a spring member 18c, and a moving member 18d. When the lever 18a rotates, the cam 18b rotates. When the cam 18b rotates, the spring member 18c is compressed. The spring member 18c generates an elastic force that moves the moving member 18d forward. The moving member 18d is connected to the second saw wheel 42. The second saw wheel 42 receives an elastic force that moves forward from the spring member 18c.

[0071] The motor 20 is an electric motor driven by electric power from the battery 26. As shown in FIG. 7, the motor 20 is coaxially connected to the first saw blade 40 via a speed reduction unit 70 composed of a plurality of planetary gears or the like and a spindle 56. The motor 20 is disposed on the rear side of the concave portion 10n.

[0072] The motor 20 has a stator 52 and a rotor 54. The motor 20 is housed in a housing 50. The motor 20 is disposed on the rear side of the concave portion 10n and on the front side of the rear end portion of the main body portion 10. The motor 20 is provided so as to protrude from the frame 30 toward the M side.

[0073] The housing 50 includes a first portion 50a that functions as a motor housing for housing the motor 20, and a second portion 50b for housing wiring or the like connected to the stator 52. As shown in FIG. 2, the first portion 50a is provided so as to protrude from the frame 30 toward the M side. The second portion 50b is provided so as to protrude forward from the first portion 50a. The second portion 50b is inclined toward the K side toward the front side.

[0074] The stator 52 is cylindrical. The rotor 54 is disposed inside the stator 52. As shown in FIG. 7, the tip portion on the S side of the rotor 54 is connected to the spindle 56 via the speed reduction unit 70. The spindle 56 is connected to the first saw blade 40. When the rotor 54 rotates, the first saw blade 40 rotates.

[0075] As shown in FIGS. 2 and 3, the guide mechanism 14 is attached to the frame 30 of the main body portion 10. The guide mechanism 14 supports the object to be cut W. The guide mechanism 14 guides the object to be cut W to the cutting portion 12c of the band saw blade 12 disposed inside the concave portion 10n while supporting the object to be cut W.

[0076] [Guide mechanism] FIG. 8 is a view of the guide mechanism 14 according to the embodiment as seen from the rear side. FIG. 9 is an exploded view showing the guide mechanism 14 according to the embodiment. FIG. 10 is a view of the guide mechanism 14 supporting the object W to be cut before cutting according to the embodiment as seen from the left side. FIG. 11 is a view showing the operation of the portable band saw 1 according to the embodiment. FIG. 12 is a view of the guide mechanism 14 supporting the object W to be cut after cutting according to the embodiment as seen from the left side.

[0077] The guide mechanism 14 guides the object W to be cut from the outside of the recess 10n to the inside of the recess 10n while the band saw blade 12 is rotating. The guide mechanism 14 restricts the movement of the object W to be cut due to the rotation of the band saw blade 12.

[0078] The guide mechanism 14 includes a guide plate 100 that supports the object W to be cut, a swing plate 200 fixed to the guide plate 100, a swing support shaft 300 that swingably supports the swing plate 200, a spring 400 that generates an elastic force so that the guide plate 100 moves from the inside to the outside of the recess 10n, and a guide shaft 500 that guides the guide plate 100.

[0079] The guide plate 100 has an upper surface contact portion 101 that contacts the upper surface of the object W to be cut, a rear surface contact portion 102 that contacts the rear surface of the object W to be cut, and a bent portion 103 that connects the rear end portion of the upper surface contact portion 101 and the upper end portion of the rear surface contact portion 102. The guide plate 100 is made of metal. Examples of the metal forming the guide plate 100 include steel or aluminum.

[0080] The guide plate 100 is formed by bending a single metal plate. The upper surface contact portion 101 is flat. The rear surface contact portion 102 is flat. The upper surface contact portion 101 has a contact surface 101A that contacts the upper surface of the object W to be cut. The rear surface contact portion 102 has a contact surface 102A that contacts the rear surface of the object W to be cut. The angle θ formed by the contact surface 101A of the upper surface contact portion 101 and the contact surface 102A of the rear surface contact portion 102 is 80 degrees or more and 100 degrees or less. In the embodiment, the angle θ is substantially 90 degrees.

[0081] The guide plate 100 has a slit portion 104 into which the band saw blade 12 can enter. In the left - right direction, the slit portion 104 is provided at the central portion of the guide plate 100. The slit portion 104 has an upper slit portion 105 provided in the upper surface contact portion 101 and a rear slit portion 106 provided in the rear surface contact portion 102. The upper slit portion 105 is formed from the front end portion to the rear end portion of the upper surface contact portion 101. The rear slit portion 106 is formed from the upper end portion to the middle portion of the rear surface contact portion 102. The rear end portion of the upper slit portion 105 and the upper end portion of the rear slit portion 106 are connected at the bent portion 103. The rear slit portion 106 is not provided from the middle portion to the lower end portion of the rear surface contact portion 102. A bead 107 for reinforcing the guide plate 100 is provided between the middle portion and the lower end portion of the rear surface contact portion 102.

[0082] When the band saw blade 12 enters the slit portion 104, the upper surface contact portion 101 is disposed on each of the right - hand side and the left - hand side of the band saw blade 12. When the band saw blade 12 enters the slit portion 104, the rear surface contact portion 102 is disposed on each of the right - hand side and the left - hand side of the band saw blade 12.

[0083] At least a part of the swing plate 200 is disposed on the rear side of the guide plate 100. The swing plate 200 is fixed to the rear surface contact portion 102 of the guide plate 100.

[0084] The swing plate 200 has an arm portion 201 swingably supported about a swing support shaft 300 with respect to the main body portion 10, and a fixing portion 202 fixed to the rear surface contact portion 102 of the guide plate 100. The arm portion 201 is long in the front - rear direction. A bead 203 for reinforcing the arm portion 201 is provided on the arm portion 201. The fixing portion 202 is fixed to the rear surface of the rear surface contact portion 102 on the left side of the rear slit portion 106. The fixing portion 202 is connected to the front end portion of the arm portion 201. The swing support shaft 300 supports the rear end portion of the arm portion 201.

[0085] The swing support shaft 300 swingably supports the guide plate 100 via the swing plate 200. The swing support shaft 300 is provided on the rear side of the concave portion 10n. The guide plate 100 is swingably supported on the main body 10 about the swing support shaft 300 via the swing plate 200. The axis AX of the swing support shaft 300 extends in the left-right direction. The guide plate 100 swings so as to rotate at least a part around the axis AX.

[0086] In the embodiment, the swing support shaft 300 includes a stepped screw. The swing support shaft 300 is inserted into an insertion hole 204 provided at the rear end portion of the arm portion 201. A washer 301 is disposed between the head of the swing support shaft 300 and the arm portion 201. After the swing support shaft 300 is inserted into the insertion hole 204 of the arm portion 201, it is attached to the frame 30 of the main body 10.

[0087] The swing support shaft 300 is provided on the main body 10 between the concave portion 10n and the rear end portion of the main body 10. The swing support shaft 300 is provided on the side surface of the main body 10 closer to the opening of the band saw blade 12 than the center of the main body 10 in the KL direction (second predetermined direction). That is, the swing support shaft 300 is provided on the side surface on the L side of the frame 30. Here, the center of the main body 10 is a virtual plane PL including the rotation axis BX and the rotation axis CX.

[0088] The spring 400 is a torsion spring disposed around the swing support shaft 300. The spring 400 generates an elastic force so that the guide plate 100 is disposed outside the concave portion 10n. When no external force acts on the guide plate 100, the guide plate 100 is disposed outside the concave portion 10n by the elastic force of the spring 400.

[0089] An arc-shaped guide hole 205 is provided in the arm portion 201 of the swing plate 200. The guide hole 205 is arc-shaped with the central portion of the guide hole 205 protruding forward. A guide shaft 500 is inserted into the guide hole 205. The guide shaft 500 is fixed to the frame 30 of the main body 10 in a state of being inserted into the guide hole 205.

[0090] In an embodiment, the guide shaft 500 includes a stepped screw. The guide shaft 500 is inserted into a guide hole 205 provided in the central portion of the arm portion 201. A washer 501 is disposed between the head of the guide shaft 500 and the arm portion 201. After the guide shaft 500 is inserted into the guide hole 205 of the arm portion 201, it is attached to the frame 30 of the main body portion 10. The swing plate 200 and the guide plate 100 swing about the swing support shaft 300 while being guided by the guide shaft 500.

[0091] [Operation] The user performs an operation of using the portable band saw 1 while gripping the handle 22. In the embodiment, it is assumed that the object to be cut W is a pipe (round pipe material). As shown in FIGS. 10 and 11, before cutting the object to be cut W, the guide plate 100 is disposed outside the recess 10n. The upper surface contact portion 101 is brought into contact with the upper surface of the object to be cut W, and the rear surface contact portion 102 is brought into contact with the rear surface of the object to be cut W.

[0092] When the motor 20 is started, the running of the band saw blade 12 is started. The band saw blade 12 runs from the front side to the rear side in the recess 10n.

[0093] While the band saw blade 12 is running, the user operates the main body portion 10 by gripping the handle 22 so that the band saw blade 12 approaches the object to be cut W. The guide plate 100 and the swing plate 200 and the main body portion 10 can rotate relative to each other about the swing support shaft 300. The user operates the main body portion 10 so that the upper surface contact portion 101 is in contact with the upper surface of the object to be cut W and the rear surface contact portion 102 is in contact with the rear surface of the object to be cut W, and the band saw blade 12 approaches the object to be cut W. The user operates the main body portion 10 so that the guide plate 100 supporting the object to be cut W moves from the outside of the recess 10n to the inside of the recess 10n. The user operates the main body portion 10 so that the band saw blade 12 approaches the object to be cut W against the elastic force of the spring 400.

[0094] As the main body 10 rotates about the swing support shaft 300 so that the band saw blade 12 approaches the workpiece W to be cut, the band saw blade 12 enters the slit portion 104. After the band saw blade 12 enters the slit portion 104, it can contact the workpiece W to be cut. When the running band saw blade 12 contacts the workpiece W to be cut, the cutting of the workpiece W by the band saw blade 12 is started.

[0095] As shown in FIGS. 11 and 12, after cutting the workpiece W to be cut, at least a part of the upper surface contact portion 101 and the rear surface contact portion 102 of the guide plate 100 is disposed inside the recess 10n. By operating the main body 10 until the workpiece W to be cut is disposed inside the recess 10n, the workpiece W to be cut is cut by the band saw blade 12.

[0096] [Effect] As described above, in the embodiment, the portable band saw 1 includes a first saw wheel 40, a second saw wheel 42 disposed in front of the first saw wheel 40, a motor 20 that rotates at least one of the first saw wheel 40 and the second saw wheel 42, a main body 10 that supports each of the first saw wheel 40, the second saw wheel 42, and the motor 20 and has a recess 10n, a band saw blade 12 that is wound around each of the first saw wheel 40 and the second saw wheel 42 and cuts the workpiece W to be cut in the recess 10n, and a guide plate 100 that supports the workpiece W to be cut. The guide plate 100 has an upper surface contact portion 101 that contacts the upper surface of the workpiece W to be cut. The guide plate 100 is swingably supported by the main body 10 about the swing support shaft 300 so as to move from the outside to the inside of the recess 10n in a state where the upper surface contact portion 101 contacts the upper surface of the workpiece W to be cut.

[0097] In the above configuration, since the guide plate 100 has the upper surface contact portion 101 that contacts the upper surface of the object to be cut W, the object to be cut W is suppressed from tilting in the left - right direction. The portable band saw 1 can cut the object to be cut W into a desired shape while the tilting of the object to be cut W is suppressed. For example, when the object to be cut W is a pipe, the portable band saw 1 can cut the pipe so that the cut surface of the pipe is orthogonal to the central axis of the pipe. Also, since the guide plate 100 swings, the user can easily operate the main body portion 10.

[0098] In the embodiment, the axis of the swing support shaft 300 extends in the left - right direction.

[0099] In the above configuration, even when the main body portion 10 and the guide plate 100 swing relative to each other, the object to be cut W is stably supported by the guide plate 100.

[0100] In the embodiment, the swing support shaft 300 is provided on the main body portion 10 between the concave portion 10n and the rear end portion of the main body portion 10.

[0101] In the above configuration, when the user relatively swings the main body portion 10 and the guide plate 100, the user can easily operate the main body portion 10. Also, the enlargement of the portable band saw 1 is suppressed.

[0102] In the embodiment, when the direction parallel to the rotation axis MX of the motor 20 is defined as the MS direction (first predetermined direction), and the direction orthogonal to each of the MS direction and the front - rear direction is defined as the KL direction (second predetermined direction), the swing support shaft 300 is provided on the side surface of the main body portion 10 closer to the band saw blade 12 than the center of the main body portion 10 in the KL direction.

[0103] In the above configuration, the enlargement and complication of the guide plate 100 are suppressed.

[0104] In the embodiment, the swing support shaft 300 is provided on the rear - side of the concave portion 10n. The band saw blade 12 runs from the front - side to the rear - side in the concave portion 10n. The guide plate 100 has a rear - surface contact portion 102 that contacts the rear surface of the object to be cut W.

[0105] In the above configuration, the guide plate 100 can support the workpiece W to be cut, which tends to move backward due to the running of the band saw blade 12, by the rear surface contact portion 102.

[0106] In an embodiment, the guide plate 100 has a bent portion 103 that connects the rear end portion of the upper surface contact portion 101 and the upper end portion of the rear surface contact portion 102.

[0107] In the above configuration, since the guide plate 100 has the upper surface contact portion 101 and the rear surface contact portion 102, the workpiece W is stably supported by the guide plate 100.

[0108] In an embodiment, the angle θ formed between the upper surface contact portion 101 and the rear surface contact portion 102 is 80 degrees or more and 100 degrees or less.

[0109] In the above configuration, when the workpiece W is a round material or a square material, the guide plate 100 can stably support the workpiece W.

[0110] In an embodiment, the portable band saw 1 includes a swing plate 200 fixed to the guide plate 100. The swing plate 200 is swingably supported on the main body portion 10 about a swing support shaft 300. An arc-shaped guide hole 205 is provided in the swing plate 200. The portable band saw 1 includes a guide shaft 500 that is inserted into the guide hole 205 and fixed to the main body portion 10.

[0111] In the above configuration, the guide plate 100 can swing while being guided by the guide shaft 500.

[0112] In an embodiment, the upper surface contact portions 101 are respectively arranged on the right side and the left side of the band saw blade 12.

[0113] In the above configuration, the upper surface contact portions 101 can support the workpiece W on the right side and the left side of the band saw blade 12, respectively.

[0114] In an embodiment, the rear contact portions 102 are disposed on the right and left sides of the band saw blade 12, respectively.

[0115] With the above configuration, the rear contact portions 102 can support the workpiece W on the right and left sides of the band saw blade 12, respectively.

[0116] In an embodiment, the portable band saw 1 includes a spring 400 that generates an elastic force so that the guide plate 100 moves from the inside to the outside of the recess 10n.

[0117] With the above configuration, the guide plate 100 can return to the initial position outside the recess 10n by the elastic force of the spring 400.

[0118] In an embodiment, the guide plate 100 is made of metal.

[0119] With the above configuration, the guide plate 100 can maintain the required strength. Examples of the metal forming the guide plate 100 include steel or aluminum.

[0120] [Other Embodiments] In the above-described embodiment, the motor 20 is connected to the first saw wheel 40 and rotates the first saw wheel 40. The motor 20 may be connected to the second saw wheel 42 and rotate the second saw wheel 42.

Description of Reference Numerals

[0121] 1…Portable band saw, 10…Main body, 10n…Recess, 12…Band saw blade, 12c…Cutting part, 14…Guide mechanism, 18…Tension adjustment mechanism, 18a…Lever, 18b…Cam, 18c…Spring member, 18d…Moving member, 20…Motor, 22…Handle, 24…Battery mounting part, 26…Battery, 30…Frame, 30a…Vertical wall part, 30d…Lock part, 30f…Surface, 30n…Notch, 30p…Straight part, 30g…First curved part, 30r…Second curved part, 30s…Third curved part, 30t…Fourth curved part, 32…Cover, 32a…Vertical wall part, 32b…Opening, 32c…Opening, 32d…Lock part, 32n…Notch, 32p…Straight part, 32g…First curved part, 32r…Second curved part, 32s…Third curved part, 32t…Fourth curved part, 40…First saw wheel, 42…Second saw wheel, 44…Guide part, 44a…First guide part, 44b…Second guide part, 50…Housing, 50a…First part, 50b…Second part, 52…Stator, 54…Rotor, 56…Spindle, 60…Support part, 62…Grip part, 70…Reduction part, 100…Guide plate, 101…Upper surface contact part, 101A…Contact surface, 102…Rear surface contact part, 102A…Contact surface, 103…Bent part, 104…Slit part, 105…Upper slit part, 106…Rear slit part, 107…Bead, 200…Swing plate, 201…Arm part, 202…Fixed part, 203…Bead, 204…Insertion hole, 205…Guide hole, 300…Swing support shaft, 301…Washer, 400…Spring, 500…Guide shaft, 501…Washer, AX…Axis center, BX…Rotation axis, CX…Rotation axis, MX…Rotation axis, PL…Virtual plane.

Claims

1. A first saw carriage; A second saw carriage disposed in front of the first saw carriage; A motor for rotating at least one of the first saw carriage and the second saw carriage; A main body portion that supports each of the first saw carriage, the second saw carriage, and the motor and has a recess; An endless saw blade that is mounted on each of the first saw carriage and the second saw carriage and cuts a cutting object in the recess; A guide plate that supports the cutting object, and; The guide plate has an upper surface abutting portion that abuts against the upper surface of the cutting object, and is swingably supported by the main body portion about a swing support shaft so as to move from the outside to the inside of the recess in a state where the upper surface abutting portion is in contact with the upper surface of the cutting object. A portable band saw.

2. The axis of the swing support shaft extends in the left-right direction. The portable band saw according to Claim 1.

3. The swing support shaft is provided on the main body portion between the recess and the rear end portion of the main body portion. The portable band saw according to Claim 1.

4. When a direction parallel to the rotation axis of the motor is defined as a first predetermined direction and a direction orthogonal to each of the first predetermined direction and the front-rear direction is defined as a second predetermined direction, The swing support shaft is provided on a side surface of the main body portion closer to the open portion of the endless saw blade than the center of the main body portion in the second predetermined direction. The portable band saw according to Claim 3.

5. The swing support shaft is provided on the rear side of the recess, The endless saw blade travels from the front side to the rear side in the recess, The guide plate has a rear surface abutting portion that abuts against the rear surface of the cutting object. The portable band saw according to Claim 1.

6. The guide plate has a bent portion that connects a rear end portion of the upper surface abutting portion and an upper end portion of the rear surface abutting portion. The portable band saw according to Claim 5.

7. An angle formed by the upper surface abutting portion and the rear surface abutting portion is 80 degrees or more and 100 degrees or less. The portable band saw according to Claim 6.

8. The guide plate includes a swing plate fixed thereto, The swing plate is swingably supported by the main body portion about the swing support shaft, An arc-shaped guide hole is provided in the swing plate, The guide plate includes a guide shaft that is inserted into the guide hole and fixed to the main body portion. The portable band saw according to Claim 1.

9. The upper surface abutting portion is disposed on each of the right side and the left side of the endless saw blade. The portable band saw according to Claim 1.

10. ​ The rear abutting portion is disposed on each of the right side and the left side of the band saw blade. The portable band saw according to claim 5.

11. having a spring that generates an elastic force so that the guide plate moves from the inside to the outside of the recess The portable band saw according to claim 1.

12. The guide plate is made of metal. The portable band saw according to claim 1.

Images