JP2019025608A - Electric tool - Google Patents

Abstract

To provide an electric tool which prevents malfunction of a controller caused by noise occurring in a power line.SOLUTION: An electric tool 1 includes: a motor 42 which is housed in a housing 60 and rotates a disk-like cutting blade 41; a power source 5 held by the housing; a power line 67 which supplies electric power from the power source to the motor; and a control part 45 which controls rotation of the motor. The housing has: a first housing part 65 which houses the motor and the power line and has a power source holding part for holding the power source; and a second housing part 69 which houses the control part. The first housing part and the second housing part separate from each other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electric tool that operates using, for example, a battery as a power source.

  For example, a cordless type tabletop cutting machine driven by a battery mainly includes a power line for supplying power from the battery to the motor and a signal line for monitoring and controlling the operation of the motor by the controller as wiring inside the housing. Have. The controller detects the state of the motor rotating by the electric power from the battery, receives the output via the signal line, and controls the operation of the motor.

Patent No. 5924492

  Usually, since the battery is mounted on the outer peripheral surface of the housing away from the motor, the length of the power line from the battery to the motor becomes long, and the influence of noise generated from the power line cannot be ignored. Moreover, since the space in the housing is small, the power line and various signal lines may be wired so as to be adjacent to each other over a long section. For this reason, the signal line may pick up noise generated from the power line, and due to the influence of this noise, the controller may erroneously recognize a signal from the motor and malfunction.

  In addition, in order to suppress noise generated from the power line, it is necessary to provide a large-capacity capacitor in the circuit inside the housing.

  An object of the present invention is to provide a highly reliable electric tool that prevents malfunction of a controller due to noise generated in a power line.

  An electric power tool of the present invention includes a motor that is housed in a housing and rotates a disk-shaped cutting blade, a power source held by the housing, a power line that supplies power from the power source to the motor, and rotation of the motor. A first control unit having a power supply holding unit for storing the motor and the power line and holding the power source, and a second storage unit for storing the control unit. And the first storage part and the second storage part are separated from each other.

  With the above configuration, the length of the power line between the power source and the motor can be shortened, so that the amount of noise generated from the power line can be reduced. In addition, the control unit is stored in the second storage unit that is separated from the first storage unit that stores the power line, and is not arranged in a space where the power line is present, so that the influence of noise generated from the power line can be reduced. Therefore, malfunction of the control unit can be prevented. In addition, the length of the signal line and the power line that connect the control unit and the motor for controlling the motor can be shortened, and the influence on the signal line due to noise generated from the power line can be suppressed.

  Preferably, a base having a mounting surface on which a material to be cut can be placed, a cutting portion having the cutting blade, the motor, and the housing, and an end portion of the base are erected to swing the cutting portion. And a support portion that is movably supported and moves closer to or away from the mounting surface, the motor has an output shaft extending in a direction intersecting a side surface of the cutting blade, and the power source The control unit is positioned on the opposite side of the mounting surface with respect to the motor, the control unit is positioned on the opposite side of the mounting surface with respect to the output shaft of the motor, and the first storage unit and the support Located between the parts.

  With the above configuration, since the power source and the control unit are located on the opposite side of the mounting surface of the base with respect to the motor, the power source or the control unit supports when the support unit is provided to be tiltable with respect to the mounting surface. The support portion can be tilted at a large angle with respect to the placement surface without disturbing the tilting of the portion with respect to the placement surface.

  Preferably, the support portion includes a slide pipe that slidably supports the cutting portion, and the shadow portion is formed in a shadow region formed when the cutting portion is projected with a light beam parallel to a longitudinal direction of the slide pipe. Includes the shadow of a slide pipe. With this configuration, the shadow of the slide pipe is included in the shadow area of the battery or the housing, and the slide pipe does not protrude from the housing in a direction perpendicular to the longitudinal direction of the slide pipe. Both can be made compact.

  Preferably, the power source has a guide rail for mounting to the housing, the housing has a rail receiving portion that engages with the guide rail, and the extending direction of the rail receiving portion is the output shaft. Perpendicular to the longitudinal direction. Usually, the guide rail of the power source is formed along the longitudinal direction of the power source. Therefore, when the support portion stands upright with respect to the base by the above configuration, the large size of the cutting portion due to the power source protruding from the lateral direction of the housing. Can be suppressed.

  Preferably, it has means for fixing the cutting part to the support part for conveyance, and when the cutting part is fixed by the means, the direction in which the rail receiving part of the housing extends is the slide It is substantially orthogonal to the longitudinal direction of the pipe. With this configuration, the force acting on the slide pipe when the power source is mounted on the housing is directed in a direction substantially perpendicular to the longitudinal direction of the slide pipe, and hardly acts in the direction along the slide pipe. Therefore, when the power source is mounted on the housing, it is possible to prevent the cutting portion from sliding on the slide pipe.

  Preferably, the slide pipe is composed of a pair of pipes whose longitudinal directions are substantially parallel to each other, and the extending direction of the rail receiving portion of the housing is substantially parallel to a plane including the center of each of the paired pipes. is there. With this configuration, the force acting on the pair of slide pipes when the power supply is installed in the housing is parallel to the plane around the center of the pipe, and one slide pipe rotates around the other slide pipe. It is not a force to make you. Therefore, the occurrence of distortion such as rotation of the slide pipe due to this force can be suppressed.

  According to the power tool of the present invention, it is possible to suppress the generation of noise by shortening the power line and to prevent malfunction of the motor due to the noise generated from the power line.

1 is a side view of a single-tilt type tabletop cutting machine according to a first embodiment of the present invention. The front view of the tabletop cutting machine shown in FIG. Sectional drawing about line segment III-III of the tabletop cutting machine shown in FIG. Sectional drawing of the housing about line segment IV-IV of the tabletop cutting machine shown in FIG. The side view of the both-tilt type desk top cutting machine which is the 2nd Embodiment of this invention. The front view of the tabletop cutting machine shown in FIG. The longitudinal cross-sectional view about line segment VII-VII of the tabletop cutting machine shown in FIG. Sectional drawing about line segment VIII-VIII of the tabletop cutting machine shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or equivalent components, members, processes, and the like shown in the drawings are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate.

  A single-tilt type tabletop cutting machine 1 according to a first embodiment as an electric power tool of the present invention will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the tabletop cutting machine 1 is mainly composed of a base part 2, a support part 3, and a cutting part 4. A disc-shaped saw blade 41 is mounted as a cutting blade on the cutting portion 4, and the cutting portion 4 can be tilted with respect to the base portion 2 in a direction perpendicular to the side surface of the saw blade 41. On the other hand, the saw blade 41 is configured to be swingable in the direction of approaching or separating.

  The base portion 2 is mainly composed of a base 21 that can be placed on a floor surface, a turntable 22 carried on the base 21, and a fence 23 provided on the base 21. The upper surface of the turntable 22 is substantially flush with the upper surface of the base 21, and the turntable 22 is connected to the base 21 so as to be rotatable about the center of the base 21 as a rotation axis. The upper surfaces of the base 21 and the turntable 22 together constitute a placement surface 21A on which the material to be cut W is placed. Further, the turntable 22 and the base 21 are formed with a groove portion (not shown) into which the saw blade 41 enters when the cutting portion 4 is lowered.

  The fences 23 are paired as shown in FIG. 2, and each has a pressing surface 23 </ b> A that is substantially orthogonal to the upper surface of the base 21. When cutting the material to be cut W, one surface of the material to be cut W comes into contact with the pressing surface 23A of the fence 23.

  At the front part of the turntable 22, an operation unit 24 for performing a turning operation of the turntable 22 and a turning position fixing operation is provided. With the operation unit 24, the turntable 22 can be rotated around the rotation axis of the base 21 and fixed at an arbitrary angle. At the rear part of the turntable 22, a tilting shaft 25 and a protruding part 26 are provided. The tilt shaft 25 extends in the front-rear direction so that the center axis thereof coincides with the upper surface of the turntable 22. The protruding portion 26 protrudes upward and has a long hole 26 a (FIG. 2) formed in an arc shape around the central axis of the tilting shaft 25.

  The support portion 3 is erected upward at the rear portion of the turntable 22 and is attached to the turntable 22 so as to be tiltable with respect to the tilt shaft 25, and the mounting surface 21A from the upper end portion of the holder 31. Two slide pipes 32 and 33 fixedly supported in parallel with each other, a slider 34 slidably provided with respect to the slide pipes 32 and 33, and a swing for connecting the cutting portion 4 to the slider 34 so as to be swingable. A shaft 35 is provided.

  Since the lower portion of the holder 31 is provided to be rotatable around the tilting shaft 25, the holder 31 can be tilted in the left-right direction of the turntable 22. The rear part of the turntable 22 is an example of one end part of the base 21.

  A screw hole 31a is formed in the holder 31 at a position coinciding with the long hole 26a, and the clamp lever 36 is screwed into the screw hole 31a. Specifically, the screw portion of the clamp lever 36 passes through the long hole 26a and is screwed into the screwing hole 31a. By operating the clamp lever 36 in the release direction, the pressing force against the surface of the protruding portion 26 of the clamp lever 36 is released, so that the holder 31 can tilt around the tilt shaft 25 within the arc length range of the long hole 26a. It becomes. On the other hand, by operating the clamp lever 36 in the fixing direction, a pressing force is applied from the clamp lever 36 to the surface of the protruding portion 26, so that the holder 31 is fixed to the protruding portion 26 at a desired inclination angle. The Thereby, since the holder 31 is fixed with respect to the turntable 22, what is called an inclination cutting is attained.

  A stopper (not shown), which is a positioning means at the time of tilting, is provided on the side surface portion of the holder 31 on the base portion 2 side, and a stopper bolt (not shown) is positioned on the movement trajectory of the stopper on the upper surface of the turntable 22. It has been stopped. When the holder 31 is tilted with respect to the turntable 22 around the tilt shaft 25, the stopper comes into contact with each head of the stopper bolt at a predetermined tilt angle, and the tilt position of the cutting portion 4 is positioned. In the present embodiment, the state in which the holder 31 stands upright in the vertical direction with respect to the mounting surface 21A is defined as an inclination angle of 0 degrees, and the holder is in the upright state. One stopper bolt is provided so as to engage with one stopper when the holder 31 is tilted from 0 to 45 degrees in the left direction. The other stopper bolt is provided so as to engage with the other stopper when the holder 31 is tilted from 0 degree to the right at 5 degrees. Therefore, in the present embodiment, it is possible to make an inclination cut from 45 degrees leftward to 5 degrees rightward.

  One of the slide pipes 32, 33 extends in a direction parallel to the mounting surface 21 </ b> A of the base 21 and perpendicular to the rotational axis of the saw blade 41. The other slide pipe 33 extends parallel to the slide pipe 32 and is positioned below the slide pipe 32 when the holder 31 is upright. The slide pipes 32 and 33 have substantially the same length, and a connecting member 37 is attached to their front end portions. The slide pipes 32 and 33 can change the position of the cutting portion 4 with respect to the holder 31, and the cutting work can be performed at a desired position on the workpiece W placed on the placement surface 21 </ b> A.

  The cutting unit 4 includes a saw blade 41, a motor 42 that rotates the saw blade 41, a power transmission mechanism 43 provided between the motor 42 and the saw blade 41, and a battery pack 5 that supplies power to the motor 42. Prepare. The cutting unit 4 has a housing 60 that houses the motor 42 and the power transmission mechanism 43.

  The rear end portion of the housing 60 is connected to the slider 34 via the swing shaft 35. In the present embodiment, the swing shaft 35 is an axis extending in a direction perpendicular to the side surface of the saw blade 41. The housing 60 is rotatable with respect to the slider 34 around the swing shaft 35 and swingable in a direction approaching or separating from the base 21. A spring (not shown) is provided around the swing shaft 35 of the slider 34, and the cutting portion 4 is urged by the spring to swing in a direction (upward) in which the saw blade 41 is separated from the base portion 2. Yes. Therefore, unless a downward force is applied to the operation handle 61 provided at the upper front portion of the housing 60, the cutting portion 4 is swung most upward by a stopper mechanism (not shown) provided around the rocking shaft 35. Stopped in position and maintained in this position. In the present invention, this position is referred to as “top dead center”. The operation handle 61 is provided with a switch 62 for switching the motor 42 on and off.

  On the other hand, by applying a downward force to the operation handle 61, the cutting portion 4 is swung downward with the rocking shaft 35 as a fulcrum against the biasing force of the spring, so that cutting can be performed. When the cutting portion 4 is swung downward, the saw blade 41 enters the groove portion of the turntable 22 and is stopped by a stopper mechanism (not shown) at a position where a predetermined amount has entered. In the present invention, this position is referred to as “bottom dead center”. Therefore, in the tabletop cutting machine 1 shown in FIG. 1, the cutting unit 4 is located at the bottom dead center.

  As shown in FIG. 3, the housing 60 includes a saw cover 63 that covers a part of the outer periphery of the saw blade 41, a saw blade shaft portion 44 that is connected to the saw cover 63 and serves as a rotation center of the saw blade 41, and a power transmission mechanism 43. And a main housing 64 that houses the control unit 45, and a motor housing 65 that is coupled to a side surface of the main housing 64 and houses the motor 42. Since the operation handle 61 is integrally provided in the main housing 64, the saw blade 41 is moved toward the base 21 by swinging the main housing 64 about the swing shaft 35 by the operation handle 61. Is possible.

  In the saw cover 63, a saw cover 66 (FIG. 3) having a shape covering the outer peripheral portion of the saw blade 41 protruding from the saw cover 63 is rotatably provided. The saw cover 66 rotates to a position that covers the outer periphery of the saw blade 41 protruding from the saw cover 63 when the cutting portion 4 is at the top dead center. On the other hand, the saw cover 66 is accommodated in the saw cover 63 by a link mechanism (not shown) in a state where the cutting portion 4 is swinging downward.

  The main housing 64 is provided with a battery mounting portion 64A to which the battery pack 5 as a power source is mounted. A power line 67 is wired from the battery mounting portion 64A to the motor 42, and power is supplied to the motor 42. In addition to the operation handle 61, the main housing 64 is provided with a transport handle 68 for transporting the entire tabletop cutting machine. The battery mounting part 64A is an example of a power supply holding part.

  The motor housing 65 is composed of a divided housing in which two divided pieces are integrated and accommodates the motor 42 therein. One end of the motor housing 65 in the longitudinal direction communicates with the main housing 64, and a slit-like wind window 65 a for cooling the motor 42 is provided at the other end.

  Further, as shown in FIG. 2, the motor housing 65 is disposed on the side surface of the main housing 64, so that the slide pipes 32 and 33 that slidably support the motor housing 65 and the housing 60 including the main housing 64 are provided. When the tabletop cutting machine 1 is viewed from the front to the rear, the shadows of the slide pipes 32 and 33 are included in the projection region of the housing 60 and do not protrude from the housing 60. Therefore, the cutting part 4 including the slide pipes 32 and 33 can be configured compactly.

  The motor 42 has a cooling fan 46 attached to the output shaft 42A and is connected to the saw blade shaft portion 44 via the power transmission mechanism 43 so that the saw blade 41 is rotated in conjunction with the rotation of the motor 42. Yes. In the present embodiment, power transmission mechanism 43 is composed of a gear. When the motor 42 is rotated, the cooling fan 46 is rotated, and the cooling air is taken into the motor housing 65 through the wind window 65a to cool the motor 42 and the power transmission mechanism 43. Further, in order to detect the operation state of the motor 42, a stator substrate 47 is provided in the vicinity of the end opposite to the output shaft 42A. The stator substrate 47 and the control unit 45 are electrically connected by a signal line 48.

  The battery pack 5 has, for example, a plurality of battery cells such as secondary battery cells, and outputs power corresponding to the tabletop cutting machine 1. In the battery pack 5, the battery case 51 has a rectangular parallelepiped shape, and a substantially rectangular surface facing the battery mounting portion 64A serves as a mounting surface in which the longitudinal direction is the mounting direction to the battery mounting portion 64A. 52. In addition, a guide rail 53 that forms a pair for mounting on the battery mounting portion 64A is formed on the mounting surface.

  On the other hand, the battery mounting portion 64A of the main housing 64 is formed with a rail receiving portion 64B with which the guide rail 53 of the battery pack 5 is engaged. When the guide rail 53 of the battery pack 5 is engaged with the rail receiving portion 64B and the mounting to the battery mounting portion 64A is completed, the terminal 52 of the battery pack 5 and the corresponding terminal portion of the main housing 64 are electrically connected. Thus, power supply from the battery pack 5 to the motor 42 becomes possible.

  Next, the positional relationship between the battery pack 5, the motor 42, and the control unit 45 with respect to the housing 60 will be described with reference to FIGS. In the following description, the up / down, left / right, and front / rear directions are based on the assumption that the cutting portion 4 is at the bottom dead center.

  As shown in FIGS. 3 and 4, in the housing 60, the motor housing 65 is attached to the main housing 64 so as to be positioned on the lower right side of the main housing 64. The motor 42 is housed in the motor housing 65 so that the output shaft 42A faces the side surface of the saw blade 41 and is orthogonal to the side surface of the saw blade 41 as shown in FIG. A stator substrate 47 is located in the vicinity of the other end of the motor 42 and constitutes a part of the motor 42.

  In the present embodiment, the reason why the motor housing 65 is disposed below the main housing 64 is that a part that becomes an obstacle when the cutting part 4 is tilted with respect to the base 21 is excluded, and the tilt angle of the cutting part 4 is This is because the range is widened and the degree of freedom for inclined cutting is increased. That is, cutting performance is ensured by adopting a configuration in which no separate parts are provided below the motor housing 65. Referring to FIG. 4, a surface that includes the output shaft 42A of the motor 42 in the plane and that is parallel to the placement surface 21A when the cutting portion 4 is at the bottom dead center is denoted by L1.

  The battery pack 5 is attached to the upper side of the motor housing 65 in the main housing 64. Therefore, the battery pack 5 is located on the opposite side of the mounting surface 21A with respect to the motor 42, that is, the surface L1. For this reason, the battery mounting portion 64 </ b> A is located above the motor housing 65 in the housing 60. Further, as shown in FIG. 3, a power line 67 extending from the terminal of the battery mounting portion 64 </ b> A to the stator substrate 47 is wired in the motor housing 65. Further, a wiring 70 that connects the terminal of the battery mounting portion 64A and the switch 62 is also provided. By operating the switch 62, power supply from the battery pack 5 to the motor 42 via the stator substrate 47 is started. ing. The motor housing 65 is an example of a first storage part of the housing 60.

  The control unit 45 is disposed in the main housing 64 in a control unit storage unit 69 that is partitioned above the surface L1 and behind the motor 42. The signal line 48 is wired from the control unit 45 to the stator substrate 47 via the control unit storage unit 69. The control unit storage unit 69 is an example of a second storage unit.

  The control unit storage unit 69 is provided at the rear of the main housing 64, while the motor housing 65 is located on the lower right side of the main housing, so that the control unit storage unit 69 and the motor housing 65 are spatially separated from each other. It is separated.

  With the above configuration, since the battery pack 5 is mounted on the main housing 64 so as to be adjacent to the motor housing 65, the length of the power line 67 connecting the battery pack 5 and the motor 42 can be shortened. That is, by providing the battery mounting portion 64 </ b> A in the motor housing 65 that houses the motor 42, the battery pack 5 and the motor 42 can be disposed close to each other, and the power line 67 can be shortened. Thus, since the length of the power line 67 through which a relatively large current flows is short, the absolute amount of noise generated from the power line 67 can be reduced. Although the tabletop cutting machine 1 is a large tool as a whole, it is necessary to concentrate electric parts related to the control of the motor 42 around the motor 42 of the cutting unit 4, and noise from the power line 67 to other parts is required. Impact is likely to increase. For this reason, the tabletop cutting machine 1 is an electric tool that is particularly effective in reducing noise generated from the power line 67. The power source is not limited to the battery pack 5 and may be a power cord for inputting AC power.

  In addition, the motor housing 65 is attached to the lower right side of the main housing 64, and the control unit storage unit 69 is located in the rear of the main housing 64. Therefore, the power line 67 wired in the motor housing 65 and the control unit storage are provided. The signal wires 48 wired to the portion 69 hardly run in parallel in the main housing 64 when coming out of the motor housing 65 or the control portion storage portion 69, respectively. For this reason, interference with a signal flowing through the signal line 48 due to noise generated from the power line 67 can be suppressed. Therefore, it is possible to reduce the influence of noise on the signal line 48 and suppress malfunction of the control unit 45 that operates based on the output from the signal line 48.

  Furthermore, the battery pack 5 is disposed above the motor 42 and the control unit 45 is disposed behind the motor 42, whereby the power line 67 extending from the battery pack 5 to the motor 42 is disposed so as to mainly extend in the vertical direction. In addition, the signal line 48 extending from the control unit 45 to the motor 42 can be arranged mainly extending in the front-rear direction. With such an arrangement, an area where the power line 67 and the signal line 48 extend side by side, that is, a parallel running area between the power line 67 and the signal line 48 can be reduced, and the influence of noise on the signal line 48 of the power line 67 is suppressed. can do.

  Further, both the power line 67 and the signal line 48 are electrically connected to the stator substrate 47. Immediately after the wiring comes out from the stator substrate 47, the power line 67 extends upward toward the battery mounting portion 64A. On the other hand, since the signal line 48 extends in the horizontal direction toward the control unit 45, the parallel running section between the power line 67 and the signal line 48 can be shortened, and interference with the signal line 48 due to noise of the power line 67 can be suppressed. .

  A capacitor can be provided in the power supply circuit to the motor 42 in order to suppress fluctuations in the current flowing from the battery pack 5 to the motor 42.

  Further, since the mounting direction of the battery pack 5 and the longitudinal direction of the output shaft 42 </ b> A of the motor 42 are substantially orthogonal, it is possible to prevent the battery case 51 from protruding from both ends of the motor housing 65 in the left-right direction. Accordingly, the housing 60 to which the battery pack 5 is attached can be prevented from being enlarged, and the cutting portion 4 can be made compact.

  Furthermore, when the cutting part 4 is at the bottom dead center, the mounting direction of the battery pack 5 with respect to the main housing 64 is substantially vertical. Since this mounting direction is a direction substantially orthogonal to the longitudinal direction of the slide pipes 32 and 33, sliding of the cutting portion 4 with respect to the slide pipes 32 and 33 when the battery pack 5 is mounted on or detached from the main housing 64 is suppressed. That is, it is possible to prevent the cutting part 4 from sliding unexpectedly when the battery pack 5 is attached to or detached from the housing 60.

  Further, since the mounting direction of the battery pack 5 is parallel to the plane including the two slide pipes 32 and 33, the rotation of the other slide pipe 32 with respect to one slide pipe 33 is performed when the battery pack 5 is mounted or detached. Suppress. Therefore, it is possible to suppress the parallelism of the two slide pipes from being distorted, and to suppress a reduction in accuracy during cutting.

  Next, a double-tilt type tabletop cutting machine 100 as a second embodiment of the electric tool of the present invention will be described with reference to FIGS. In the following description, parts that are the same as or equivalent to the parts constituting the one-side tilt type tabletop cutting machine 1 according to the first embodiment are given the same reference numerals, and duplicate descriptions are omitted as appropriate.

  The tabletop cutting machine 100 shown in FIG. 5 can be inclined and cut in either the right direction or the left direction. Accordingly, one stopper bolt constituting the positioning means for fixing and supporting the tilting position of the holder 31 is engaged with the one stopper when the holder 31 is tilted from 0 to 45 degrees in the left direction. Is provided. The other stopper bolt is provided so as to engage with the other stopper when the holder 31 is tilted from 0 degrees to a position of 45 degrees to the right. Therefore, in the present embodiment, it is possible to make an inclination cut from 45 degrees in the left direction to 45 degrees in the right direction.

  The cutting unit 104 includes a saw blade 141, a motor 142 that rotates the saw blade 141, a belt drive mechanism 143 provided between the motor 142 and the saw blade 141, and a battery pack 105 that supplies power to the motor 142. Prepare. In addition, the cutting unit 104 includes a housing 160 that houses the motor 142 and the belt driving mechanism.

  The housing 160 of the cutting unit 104 includes a main housing 164 that covers a part of the outer periphery of the saw blade 141 and accommodates the saw blade shaft 144 serving as the rotation center of the saw blade 141, the belt drive mechanism 143, and the control unit 145, and the main housing. And a motor housing 165 that houses the motor 142. As shown in FIGS. 5 and 7, when the cutting portion 104 is at the bottom dead center, the motor housing 165 is disposed on the upper side of the main housing 164. Within the motor housing 165, the motor 142 is disposed such that the output shaft 142A is parallel to the left-right direction.

  A battery mounting portion 164A to which a battery pack 105 as a power source is mounted is provided in front of the upper portion of the main housing 164. A power line 167 is wired from the battery mounting portion 164A to the motor 142, and power is supplied to the motor 142. .

  The motor housing 165 is composed of a divided housing in which two divided pieces are integrated and integrated, and houses the motor 142 therein. One end of the motor housing 165 in the longitudinal direction communicates with the main housing 164, and a slit-like air window 165 a for cooling the motor 142 is provided at the other end.

  The motor 142 has a cooling fan 146 attached to the output shaft 142A and is connected to the saw blade shaft portion 144 via the belt drive mechanism 143 so that the saw blade 141 is rotated in conjunction with the rotation of the motor 142. Yes. Further, when the motor 142 rotates, the cooling fan 146 is rotated and the cooling air is taken into the motor housing 165 through the wind window 165a to cool the motor 142 and the belt driving mechanism 143. Further, in order to detect the operation state of the motor 142, a stator substrate 147 is provided in the vicinity of the end opposite to the output shaft 142A.

  The battery pack 105 includes a plurality of battery cells such as secondary battery cells, and outputs power corresponding to the tabletop cutting machine 100. In the battery pack 105, the battery case 151 has a rectangular parallelepiped shape, and a substantially rectangular surface facing the battery mounting portion 164A is a mounting surface whose mounting direction is the mounting direction to the battery mounting portion 164A. 152. In addition, a guide rail 153 that forms a pair for mounting on the battery mounting portion 164A is formed on the mounting surface.

  On the other hand, the battery mounting portion 164A of the main housing 164 is formed with a rail receiving portion 164B to which the guide rail 153 of the battery pack 105 is engaged. When the guide rail 153 of the battery pack 105 is engaged with the rail receiving portion 164B and the mounting to the battery mounting portion 164A is completed, the terminal 152 of the battery pack 105 and the corresponding terminal portion of the main housing 164 are electrically connected. Thus, power can be supplied from the battery pack 105 to the motor 142.

  Next, the positional relationship among the battery pack 105, the motor 142, and the control unit 145 in the housing 160 will be described below with reference to FIG. In the following description, the top / bottom, left / right, and front / rear directions will be described on the assumption that the cut portion is at the bottom dead center.

  As shown in FIG. 7, in the housing 160, the motor housing 165 is attached to the main housing 164 so as to be positioned above the main housing 164. The motor 142 is housed in the motor housing 165 so that an output shaft 142A provided at one end thereof is orthogonal to the side surface of the saw blade 141. A stator substrate 147 is attached near the other end of the motor 142 as shown in FIG.

  The reason why the motor housing 165 is arranged above the main housing 164 is that a part that becomes an obstacle when the cutting portion 104 is tilted with respect to the base 21 is excluded, and the angle range is wide with respect to both the left and right directions of the base 21. This is because it is possible to perform the inclined cutting in which the span holder 31 is inclined.

  The battery pack 105 is attached to the front side of the motor housing 165 with respect to the main housing 164. For this reason, the battery mounting portion 164 </ b> A is provided on the front surface of the motor housing 165 in the housing 160. Further, as shown in FIG. 8, a power line 167 extending from the terminal of the battery mounting portion 164 </ b> A to the stator substrate 147 is wired in the motor housing 165. Furthermore, 170 is also provided for connecting the terminal of the battery mounting portion 164A and the switch 62, and by operating the switch 62, power supply to the motor 142 is started. The motor housing 165 is an example of a first storage portion of the housing 160.

  The control unit 145 is disposed in the main housing 164 in a control unit storage unit 169 that is virtually partitioned below the motor housing 165. The signal line 148 is disposed from the control unit 145 toward the stator substrate 147. The control unit storage unit 169 is an example of a second storage unit.

  The control unit storage unit 169 is provided at the rear portion of the main housing 164, while the motor housing 165 is mounted on the lower right side of the main housing 164, so that the control unit storage unit 169 and the motor housing 165 are separated from each other. Has been.

  With the above configuration, since the battery pack 105 is mounted adjacent to the motor housing 165, the length of the power line 167 connecting the battery pack 105 and the motor 142 can be shortened. Since the length of the power line 167 through which a relatively large current flows is short, the absolute amount of noise generated from the power line 167 can be reduced.

  Further, since the motor housing 165 is positioned at the upper part of the main housing 164 and the control unit storage unit 169 is positioned inside the main housing 164, the power line 167 wired in the motor housing 165 and the control unit storage unit The signal line 148 wired to 169 has almost no length for running in the main housing 164 in close proximity to each other when coming out of the motor housing 165 or the control unit housing 169. For this reason, interference with a signal flowing through the signal line 148 due to noise generated from the power line 167 can be suppressed. Therefore, noise is not included in the output from the signal line 148, and thus malfunction of the control unit 145 that operates based on the output from the signal line 148 can be prevented.

  Further, both the power line 167 and the signal line 148 are connected to the stator substrate 147, but immediately after the wiring comes out from the stator substrate 147, the power line 167 extends upward toward the battery mounting portion 164A, Since the signal line 148 extends in the horizontal direction toward the control unit 145, the parallel running section between the power line 167 and the signal line 148 can be shortened, and interference with the signal line 148 due to noise of the power line 167 can be suppressed.

DESCRIPTION OF SYMBOLS 1 Desktop cutting machine, 5 Power supply, 41 Cutting blade, 42 Motor, 45 Control part, 60 Housing, 65 Motor housing, 67 Power line, 69 Control part accommodating part

Claims (6)

A motor that is housed in a housing and rotates a disk-shaped cutting blade;
A power source held in the housing;
A power line for supplying power from the power source to the motor;
A control unit for controlling the rotation of the motor,
The housing is
A first storage unit that stores the motor and the power line and has a power supply holding unit that holds the power supply;
A second storage unit for storing the control unit;
The power tool, wherein the first storage portion and the second storage portion are separated from each other. A base having a mounting surface on which a material to be cut can be mounted;
A cutting portion having the cutting blade, the motor and the housing;
A support portion that is erected from one end portion of the base and supports the cutting portion so as to be swingable so as to approach or separate from the placement surface;
The motor has an output shaft extending in a direction intersecting a side surface of the cutting blade;
The power source is located on the opposite side of the mounting surface with respect to the motor;
2. The control unit according to claim 1, wherein the control unit is positioned on a side opposite to the mounting surface with respect to the output shaft of the motor, and is positioned between the first storage unit and the support unit. The electric tool described. The support part has a slide pipe that slidably supports the cutting part,
The electric power tool according to claim 2, wherein a shadow of the slide pipe is included in a shadow region formed when the cutting portion is projected with a light beam parallel to a longitudinal direction of the slide pipe. The power source has a guide rail for mounting to the housing,
The housing has a rail receiving portion that engages with the guide rail,
The electric tool according to claim 3, wherein a direction in which the rail receiving portion extends is orthogonal to a longitudinal direction of the output shaft. Means for fixing the cutting part to the support part for conveyance;
The electric tool according to claim 4, wherein when the cutting portion is fixed by the means, a direction in which the rail receiving portion of the housing extends is substantially orthogonal to a longitudinal direction of the slide pipe. The slide pipe is composed of a pair of pipes whose longitudinal directions are substantially parallel to each other,
6. The electric tool according to claim 4, wherein a direction in which the rail receiving portion of the housing extends is substantially parallel to a plane including the center of each of the paired pipes.

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