JP2023140558A - Dust box and belt sander - Google Patents

Abstract

To provide technique for improving dust collection efficiency in a dust box that can be attached to and detached from a belt sander.SOLUTION: A dust box attachable to and detachable form a belt sander including a discharge nozzle that discharges dust generated in processing work from a housing, and a suction nozzle that sucks air in the dust box into the housing, comprise: a first nozzle that can be connected to the discharge nozzle; a second nozzle that can be connected to the suction nozzle; a container portion made of a synthetic resin and connected to the first nozzle and the second nozzle; and a filtering member. The filtering member separates air and dust. The filtering member is provided in the container portion and divides a space in the container portion into a first space being communicated with the first nozzle and a second space being communicated with the second nozzle.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to a dust box that is detachable from a belt sander, and a belt sander that includes the dust box.

Patent Document 1 describes a belt sander that can collect dust generated during processing operations into a dust collection bag. This belt sander has a dust collection port behind the drive roller at the bottom of the housing, a dust collection path provided in the housing that communicates with the dust collection port, a discharge tube that communicates with the dust collection path, and a cuff attached to the discharge tube. Equipped with a dust bag and an attached dust bag. The dust collection path is formed so as to revolve around the motor shaft, and a dust collection fan is provided in the dust collection path. Dust is sucked through the dust collection port by the rotation of the dust collection fan, and is stored in the dust bag via the dust collection path, discharge tube, and cuffs. The belt sander further includes a ground plate that is configured to be electrically connected to the internal body at the same time as the cuffs are attached, and suppresses charging of dust during dust collection.

Japanese Patent Application Publication No. 11-291170

However, there was a desire to further improve the dust collection efficiency of the dust box that can be attached to and detached from the belt sander.

According to a first aspect of the present disclosure, a dust box that is detachable from a belt sander is provided. The belt sander includes a belt drive unit configured to rotate an endless sanding belt, and a housing that accommodates a dust collection fan and an electric motor that drives the belt drive unit. The housing has an exhaust nozzle that discharges dust generated by machining operations from inside the housing as the dust collection fan rotates, and a suction nozzle that sucks air in the dust box into the housing. The dust box includes a first nozzle connectable to the discharge nozzle, a second nozzle connectable to the suction nozzle, a container made of synthetic resin connected to the first nozzle and the second nozzle, and a filtration member that separates the dust from the dust. The filtering member is provided in the container section so as to divide the space inside the container section into a first space communicating with the first nozzle and a second space communicating with the second nozzle.

According to this aspect, the first nozzle and the second nozzle of the dust box are connected to the discharge nozzle and the suction nozzle of the belt sander, respectively, and when the dust collection fan rotates, the air in the dust box flows through the second nozzle. It is sucked into the suction nozzle. Moreover, dust generated by the processing operation is discharged from the discharge nozzle of the belt sander into the dust box via the first nozzle. At this time, the inside of the dust box becomes a negative pressure by suctioning the air, so according to the dust box of the first aspect, the dust collection efficiency can be improved. In addition, the filter member divides the space inside the container section into a first space communicating with the first nozzle and a second space communicating with the second nozzle, so that dust is stored in the dust box and transferred from the second nozzle to the housing. It is possible to suppress dust from flowing into the interior.

According to a second aspect of the present disclosure, there is provided a belt sander to which the dust box is removably attached.
According to this aspect, the dust collection efficiency can be improved in the belt sander to which the dust box is removably attached.

FIG. 2 is a perspective view of a belt sander equipped with a battery and a dust box. It is a perspective view of a belt sander. It is a left side view of the belt sander with which the battery and the dust box are attached, and is a figure showing the rotation range of the front handle. FIG. 2 is a top view of the belt sander equipped with a battery and a dust box. It is a top view of a belt sander. 5 is a cross-sectional view taken along the line VI-VI in FIG. 4. FIG. 5 is a cross-sectional view taken along the line VII-VII in FIG. 4. FIG. It is an external perspective view of a dust box. 5 is a sectional view showing the dust box taken along the line VII-VII in FIG. 4. FIG. It is a top view of a dust box, and is a sectional view showing an inside by a broken line. It is a figure showing a filter member and a frame. FIG. 7 is a partially enlarged view of FIG. 6 and shows a switch mechanism. It is a right side view with the right main body housing opened, and is an enlarged view showing the first switch and the first lock switch. FIG. 13 is a cross-sectional view of the first lock switch and the first switch operation section corresponding to the XIV-XIV arrow view in FIG. 12, and is a diagram showing a lock-off state. FIG. 15 is a diagram corresponding to FIG. 14, and is a sectional view showing a state in which the first lock switch is moved to the first lock-on position. FIG. 15 is a diagram corresponding to FIG. 14, and is a sectional view showing a state in which the first lock switch has been moved to a second lock-on position. It is a right side view with the right main body housing opened, and is an enlarged view showing the second switch and the second lock switch. 6 is a cross-sectional view of the second switch and the second lock switch taken along arrow XVIII-XVIII in FIG. 5. FIG. FIG. 19 is a diagram corresponding to FIG. 18, and is a sectional view showing a state in which the second lock switch has been moved to the lock-on position. This is an example of a battery that can be attached to and detached from a belt sander.

In one non-limiting embodiment of the present disclosure, the filtering member may be provided at a position closer to the second nozzle than to the first nozzle within the container section.
According to this form, while suppressing dust from flowing into the housing from the second nozzle, a large first space in which dust is stored can be ensured relative to the second space communicating with the second nozzle. Can be done.

In addition to or in place of the above embodiment, the belt drive section may include a drive roller rotated by the motor and a driven roller. The direction in which the rotation axis of the drive roller and the rotation axis of the driven roller extend is the left-right direction, the direction in which the driven roller and the drive roller are lined up is the front-rear direction, and the left-right direction and the direction perpendicular to the front-rear direction is the up-down direction. In this case, the polishing surface of the belt sander may be defined by the lower surface of the sanding belt. The dust box may be configured such that the first nozzle is located below the second nozzle when the dust box is attached to the belt sander. The first space may be a lower space within the container section.
According to this embodiment, the first nozzle is located below the second nozzle, and the first space is provided below inside the container, so the path from the bottom surface (polishing surface) of the sanding belt to the inside of the container is shortened. can. Therefore, dust collection efficiency can be improved.

In addition to or in place of the above embodiment, the first nozzle and the second nozzle may open in the same direction.
According to this embodiment, compared to a configuration in which the first nozzle and the second nozzle open in different directions, the airflow inside the container can be rectified, so that the dust collection efficiency can be further improved.

In addition to or in place of the above embodiments, the filtering member may be a bag-shaped air filter with one end open.
According to this embodiment, the filter member can efficiently separate dust and air.

In addition to or in place of the above embodiment, the container section includes a nozzle connection section connected to the first nozzle and the second nozzle, and a main body section detachably attached to the nozzle connection section. It may also have the following. The filtering member may be provided at the nozzle connection portion.
According to this embodiment, by removing the main body from the nozzle connection part, the dust accumulated in the container part can be removed.

In addition to or in place of the above embodiments, the container may further include an attachment/detachment section for attaching/detaching the container body to/from the nozzle connection section.
According to this embodiment, the user does not need to separately prepare a tool for attaching and detaching the container main body to the nozzle connection portion, so that the convenience of using the dust box can be improved.

In addition to the above embodiments, or in place of the above embodiments,
At least a portion of the dust box may be made of conductive synthetic resin.
According to this embodiment, the dust collection efficiency can be improved in the dust box at least partially formed of conductive synthetic resin.

In addition to or in place of the above embodiment, when the vertical direction of the belt sander is defined with the side where the belt drive unit is provided as the bottom side and the opposite side as the top side, the dust box is attached to the belt sander. In the mounted state, at least a portion of the container portion below the intermediate position in the vertical direction may be formed of the conductive synthetic resin.
According to this embodiment, the dust collection efficiency can be improved in the dust box at least partially formed of conductive synthetic resin.

In addition to or in place of the above embodiment, the dust box may include a grounding member. The grounding member may be provided in the dust box so that one end thereof is connected to the portion formed of the conductive synthetic resin, and the other end thereof is exposed to the outside of the dust box.
According to this embodiment, the electric charge on the dust box can be discharged by the grounding member. Therefore, by charging the dust box, it is possible to suppress dust from adhering to a predetermined portion of the dust box, thereby improving dust collection efficiency.

In addition to or in place of the above embodiment, there is provided a belt sander to which the dust box is removably attached. The belt sander may include an electric motor, a dust collection fan, a housing that accommodates the motor and the dust collection fan, and a belt drive section. The belt drive unit may include a drive roller rotated by the motor and a driven roller, and may be configured to drive an endless sanding belt stretched between the drive roller and the driven roller. good. The direction in which the rotation axis of the drive roller and the rotation axis of the driven roller extend is the left-right direction, the direction in which the driven roller and the drive roller are lined up is the front-rear direction, and the left-right direction and the direction perpendicular to the front-rear direction is the up-down direction. In this case, the belt drive section may be disposed below the housing. The housing may include a discharge nozzle and a suction nozzle. The discharge nozzle may be configured to discharge dust generated by the processing operation from within the housing. The suction nozzle may be configured to suction air into the housing. The housing further includes a dust collection port, an air discharge port, a first flow path connecting the dust collection port and the discharge nozzle, and a second flow path connecting the suction nozzle and the air discharge port. It may have. The dust collection port may be provided behind the belt drive section. The air outlet may be provided in the housing so as to communicate with a space in which the dust collecting fan is accommodated. The first flow path may be separated from a space in the housing in which the motor and the dust collecting fan are accommodated, and the second flow path. The second flow path may communicate with a space in which the dust collection fan is accommodated. The dust collection fan rotates to generate an airflow from the dust collection port through the first flow path toward the discharge nozzle, and an airflow from the suction nozzle through the second flow path toward the air discharge port. , may be configured to generate.
According to this embodiment, when the dust collection fan rotates, the dust generated during the processing operation is transferred together with air to the dust collection port, the first flow path, the discharge nozzle, the first nozzle, and the container section in this order. Since the filtration member is provided in the container portion of the dust box, the dust does not pass through the filtration member and is stored in the first space in the container portion. After the air in the container is separated from dust by the filtering member, it moves through the second nozzle, the suction nozzle, and the second flow path, and is discharged from the air outlet of the belt sander. Further, since the first flow path is provided to be separated from the space in which the motor and the dust collection fan are accommodated, and the second flow path, it is possible to suppress dust from adhering to the motor and the dust collection fan. Therefore, it is possible to improve dust collection efficiency and extend the life of the belt sander.

In addition to or in place of the embodiments described above, the suction nozzle and the discharge nozzle may open rearward. The discharge nozzle may be provided below the suction nozzle.
According to this embodiment, the dust collection port is provided behind the belt drive unit, and the discharge nozzle is provided below the suction nozzle, so that the first flow path, which is the flow path from the dust collection port to the discharge nozzle, is , can be constructed relatively short. Therefore, dust collection efficiency can be further improved.

<Overall configuration of belt sander>
A belt sander 1 as an embodiment of the present disclosure will be described. The belt sander 1 is a tool that can perform processing work by driving a belt drive unit 6 that holds an endless sanding belt B with a motor 2, and bringing the sanding belt B into contact with (pressing against) the workpiece. be. The belt sander 1 of this embodiment includes a handle 14. The user can process a desired location by holding the handle 14 and moving the belt sander 1 while bringing the sanding belt B into contact with the workpiece. Note that the belt sander 1 described in this embodiment is also called an "up-handle type belt sander." The up-handle type belt sander is a type of belt sander in which the handle 14 and the motor 2 are arranged on the surface of the sanding belt B opposite to the polishing surface.

First, the overall configuration of the belt sander 1 will be described using FIGS. 1 to 7. The belt sander 1 mainly includes a housing 10, an electric motor 2, a fan 3, a power transmission section 35, a belt drive section 6, a battery mounting section 4, and a switch mechanism 8.

The belt drive unit 6 includes a drive roller 61, a driven roller 62 disposed on one side with respect to the drive roller 61, and a support frame 64 (see FIG. 6) that supports these rollers rotatably around an axis. The driving roller 61 and the driven roller 62 are arranged in parallel. An endless sanding belt B is stretched between the driving roller 61 and the driven roller 62. A plate is provided on a predetermined surface of the support frame 64 to press the sanding belt B against the workpiece. The drive roller 61 is rotated by the motor 2 in the direction of arrow D (see FIG. 1).

In the following, for convenience of explanation, the direction in which the drive roller 61 and the driven roller 62 are arranged is referred to as the front-rear direction of the belt sander 1, and the side where the drive roller 61 is provided in the belt drive section 6 is the rear side, and the side where the driven roller 62 is provided is the rear side. The side that is covered is defined as the front side. Further, the direction that intersects the front-rear direction and in which the rotation axes A1 and A2 of the drive roller 61 and the driven roller 62 extend is defined as the left-right direction of the belt sander 1. Further, a direction perpendicular to the front-rear direction and the left-right direction is defined as the up-down direction of the belt sander 1. In the vertical direction, the side of the belt sander 1 where the belt drive section 6 is provided is defined as the lower side, and the opposite side is defined as the upper side. The portion of the sanding belt B exposed from the housing 10 functions as a polishing surface (sanding surface B1) for polishing the workpiece.

The housing 10 includes a main housing 11 and a lateral housing 16.

The main body housing 11 holds the belt drive section 6 with the lower end of the belt drive section 6 exposed. The main body housing 11 covers the upper part of the belt drive section 6 and the rear part of the belt drive section 6 from the rear end thereof, and extends generally in the front-rear direction as a whole. In this embodiment, the main body housing 11 is formed by screwing together a left main housing 11L and a right main housing 11R, which are halves of each other, as shown in FIG.

As shown in FIG. 2, the main body housing 11 has a first portion 12 above the belt drive unit 6 and a second portion 13 on the front side of the first portion 12.

The first portion 12 is provided above the belt drive section 6 and rearward from a substantially intermediate position of the belt drive section 6 in the front-rear direction. The first part 12 mainly houses the motor 2. The first portion 12 is also referred to as a "motor housing". The first portion 12 is formed into a substantially box shape including an upper wall 121, a front wall 122, side walls 123, 123, and a rear wall 124. The upper wall 121 is substantially perpendicular to the vertical direction. The upper wall 121 is approximately parallel to the sanding surface B1. The front wall 122 and the rear wall 124 are substantially perpendicular to the front-rear direction. The upper wall 121 only needs to be able to be placed on a desk or the like when the belt sander 1 is used in the second usage mode, and may include some unevenness.

The second portion 13 is provided above the belt drive unit 6 and forward from a substantially intermediate position of the belt drive unit 6 in the front-rear direction. The side wall 133 of the second portion 13 is continuous with the side wall 123 of the first portion 12 . The upper wall 131 of the second portion 13 is located below the upper wall 121 of the first portion 12. Therefore, the portion of the main body housing 11 located above the belt drive section 6 has a stepped shape. The second portion 13 is provided with a battery mounting portion 4 .

A portion of the main body housing 11 that is rearward of the first portion 12 constitutes a handle 14 that extends in the front-rear direction. The handle 14 is connected to the first portion 12 and extends in the front-rear direction. In this embodiment, the handle 14 is connected to the upper rear wall 124 of the first portion 12 and extends rearwardly and downwardly from the first portion 12 . The upper end of the handle 14 does not protrude higher than the upper wall 121 of the first portion 12 . In this embodiment, the upper end of the handle 14 is located at approximately the same position as the upper wall 121 in the vertical direction. The handle 14 is also referred to as a "first handle."

The rear end of the handle 14 is bent downward. The bent portion and the lower rear portion of the first portion 12 are connected. As a result, the portion of the main body housing 11 that is rearward of the belt drive section 6 has an annular shape.

A portion of the main body housing 11 where the rear end of the handle 14 and the rear of the belt drive unit 6 are connected, and which is below the handle 14, constitutes a controller accommodating portion 15. The front end portion of the controller accommodating portion 15 (the portion directly behind the belt driving portion 6) is curved along the outer edge of the driving roller 61. The main body housing 11 is open in the left-right direction at a portion directly behind the belt drive section 6. The opening functions as a dust collection port 19 for introducing dust generated by processing operations into a dust flow path (first flow path 191) provided in the housing 10.

As shown in FIG. 6, the switch mechanism 8 is provided at the rear portion of the motor 2 in the main body housing 11. The switch mechanism 8 includes a first switch 80, a second switch 90, a first lock switch 85, and a second lock switch 95 (see FIG. 4), which can be manually operated by a user. Details of the switch mechanism 8 will be described later.

Note that a dial 39 for adjusting the rotation speed of the motor 2 is provided at the rear upper part of the motor 2 in the main body housing 11 . The upper end of the dial 39 is exposed from the upper wall 121 of the main body housing 11. The dial 39 is configured so that its attitude (rotational position) can be changed by manual operation by the user. The dial 39 is connected to the controller 5 via wiring. The controller 5 is configured to set the rotation speed of the motor 2 according to the rotational position of the dial 39.

As shown in FIG. 6, the controller 5 is mounted on a main board disposed within the case of the controller accommodating section 15. In this embodiment, the controller 5 is configured as a microcomputer including a CPU and memory. The controller 5 is configured to control various operations of the belt sander 1, such as drive control of the motor 2. The controller 5 is connected to the battery mounting portion 4, the motor 2, and a first switch 80 and a second switch 90 included in the switch mechanism 8 via wiring (not shown). The controller 5 is configured to supply power from the battery 300 attached to the battery attachment part 4 to the motor 2 when the first switch 80 and the second switch 90 are in the on state. As a result, the motor 2 rotates, the belt drive unit 6 is driven via the power transmission unit 35, and the sanding belt B rotates in the direction of arrow D. Further, the controller 5 is configured not to supply power to the motor 2 when at least one of the first switch 80 and the second switch 90 is in an off state.

A portion of the left side wall 123 of the first portion 12 is open and covered by the lateral housing 16. As shown in FIGS. 3 and 4, the horizontal housing 16 includes a fan housing 161 that covers the left side of the fan 3, a gear cover 162 that covers a part of the power transmission part 35, and an endless part that is part of the power transmission part 35. and a belt cover 163 that covers the synchronized belt. The horizontal housing 16 is screwed to the left main body housing 11L.

The motor 2 is driven by electric power supplied from a battery 300 attached to the battery attachment section 4 . In this embodiment, a brushless direct current (DC) motor is used as the motor 2. As shown in FIG. 6, the motor 2 includes a motor body 21 that includes a stator and a rotor, and a shaft 22 that extends from the rotor and rotates integrally with the rotor. The shaft 22 (rotational axis A3 of the shaft 22) extends in the left-right direction. The shaft 22 is supported by the main body housing 11 via a bearing.

As shown in FIG. 7, the power transmission section 35 is held by the horizontal housing 16 and is configured to transmit the rotation of the shaft 22 to the drive roller 61. The power transmission unit 35 includes a pulley unit including a pulley integrated with the left end portion of the shaft 22, an endless synchronized belt, a gear mechanism that reduces the rotation of the shaft 22, and the like.

The fan 3 is configured to perform a function of cooling the motor 2 and a function of a dust collection fan. The fan 3 generates an airflow that cools the motor 2 and also generates an airflow that sucks dust generated by machining into the housing 10 and discharges it to the dust box 200.

In this embodiment, the fan 3 is mainly housed in the first portion 12 of the main body housing 11 and on the left side of the motor main body 21. The fan 3 is fixed on the shaft 22 between the motor body 21 and the bearing, and rotates together with the shaft 22. As described above, a portion of the left wall 123 of the first portion 12 is open, and the back surface of the fan 3 is covered by the horizontal housing 16 (fan housing 161). The front portion of the fan housing 161 is curved along the outer edge of the fan 3. A plurality of small openings (air exhaust ports 165) are provided in the curved portion of the fan housing 161 (see, for example, FIGS. 4 and 7).

The fan 3 of this embodiment is configured as a centrifugal fan. The fan 3 sucks air from the back side of the fan 3 (left side of the belt sander 1) and discharges the sucked air radially in a direction intersecting the rotation axis A3 of the shaft 22. The discharged air is sent to the motor 2 by a plurality of small blades provided on the front side of the fan 3 (on the right side of the belt sander 1) and a baffle plate 32 provided on the front side of the fan 3. Furthermore, a guide plate 31 is provided on the back side of the fan 3 and is connected to a suction nozzle 150, which will be described later. By rotating, the fan 3 sucks air from the back side and discharges it radially, and sends the discharged air to the motor 2 and also sends the air in the housing 10 to the air outlet 165.

<Configuration of dust box and belt sander for storing dust in the dust box>
The belt sander 1 of this embodiment is configured such that a dust box 200 can be attached and detached. The configuration of the belt sander 1 for storing dust in the dust box 200 and the configuration of the dust box 200 will be described below.

As shown in FIGS. 3 and 7, the housing 10 of the belt sander 1 has two cylindrical parts (a discharge nozzle 140 and a suction nozzle 150). The discharge nozzle 140 and the suction nozzle 150 are provided at the rear upper part of the horizontal housing 16 and extend in the front-rear direction. The discharge nozzle 140 and the suction nozzle 150 are arranged in the vertical direction, and the discharge nozzle 140 is located below the suction nozzle 150. The discharge nozzle 140 and the suction nozzle 150 open rearward.

As described above, the main body housing 11 has a dust collection port 19 that opens in the left-right direction at a portion directly behind the belt drive unit 6. A first flow path 191 that communicates the dust collection port 19 and the discharge nozzle 140 is formed in the housing 10 . In this embodiment, the first flow path 191 is defined by the partition wall 101 in the housing 10 and the cylindrical wall of the discharge nozzle 140. The partition wall 101 is continuously provided at the rear lower part of the main body housing 11 , the rear part of the gear cover 162 , and the rear part of the fan housing 161 . The first flow path 191 is separated by the partition wall 101 and the cylindrical wall of the discharge nozzle 140 from a space in which components such as the motor 2, the fan 3, the power transmission section 35, and the like are accommodated. Therefore, air and dust passing through the first flow path 191 do not flow into the housing portions of the motor 2, fan 3, power transmission portion 35, and the like.

As shown in FIG. 7, a second flow path 192 is provided in the housing 10 to communicate the suction nozzle 150 and the air outlet 165. The second flow path 192 communicates with a space in the housing 10 in which the fan 3 is accommodated. The second flow path 192 is mainly defined by the cylindrical wall of the suction nozzle 150, the guide plate 31, and the wall portion 102 that constitutes the fan housing 161.

Next, the configuration of the dust box 200 will be described with reference to FIGS. 7 to 11. The dust box 200 as a whole is formed to extend in a predetermined direction. The dust box 200 includes a first nozzle 210 and a second nozzle 220 extending in the predetermined direction, a container part 230 connected to the first nozzle 210 and the second nozzle 220, and a filtration filter provided in the container part 230. member 260. The first nozzle 210, the second nozzle 220, and the container portion 230 are made of a material that does not allow air to pass through. In this embodiment, the first nozzle 210, the second nozzle 220, and the container portion 230 are made of a synthetic resin having electrical conductivity.

In FIG. 8, the up-down direction, the front-back direction, and the left-right direction are shown based on the posture when the dust box 200 is attached to the belt sander 1. The dust box 200 extends in the front-rear direction as a whole when attached to the belt sander 1. The first nozzle 210 and the second nozzle 220 extend in the front-rear direction and open forward. The first nozzle 210 and the second nozzle 220 are arranged in the vertical direction, and the first nozzle 210 is located below the second nozzle 220. The dust box 200 is attached to the belt sander 1 by inserting the first nozzle 210 and the second nozzle 220 into the discharge nozzle 140 and the suction nozzle 150 of the belt sander 1, respectively. When the first nozzle 210 is inserted into the discharge nozzle 140, the first flow path 191 of the belt sander 1 and the inside of the first nozzle 210 (inside the dust box 200) communicate with each other. Further, when the second nozzle 220 is inserted into the suction nozzle 150, the second flow path 192 of the belt sander 1 and the inside of the second nozzle 220 (inside the dust box 200) communicate with each other. Note that O rings 212 and 222 are provided on the outer peripheral walls of the first nozzle 210 and the second nozzle 220, respectively. This maintains airtightness at the connection points of each nozzle.

The container portion 230 is formed into a substantially box shape extending in the front-rear direction. The length of the container portion 230 in the left-right direction is shorter than the length of the container portion 230 in the vertical direction and the length in the front-rear direction. The upper wall (upper surface 231) of the container portion 230 is substantially perpendicular to the vertical direction. The lower wall (lower surface 234) of the container portion 230 is inclined rearward and upward. As shown in FIG. 4, when the dust box 200 is attached to the belt sander 1, the container section 230 is located on the left side of the handle 14 and the controller housing section 15.

The dust box 200 is configured to fit within the vertical and horizontal widths of the housing 10 when attached to the belt sander 1. Further, the dust box 200 is configured such that the lower surface 234 is located above the sanding surface B1 in the vertical direction when the dust box 200 is attached to the belt sander 1. In this embodiment, as shown in FIG. 4, the position of the left side surface 233 of the container part 230 in the left-right direction is substantially the same as the left side surface of the housing 10 (the left side surface of the fan housing 161). Moreover, as shown in FIG. 7, the position of the upper surface 231 of the container part 230 in the vertical direction is substantially the same as the upper end (upper wall 121) of the belt sander 1.

The container section 230 is configured to be separable into a nozzle connection section 240 and a main body section 250. The nozzle connection part 240 is the front part of the container part 230 and is connected to the first nozzle 210 and the second nozzle 220. In this embodiment, the nozzle connection part 240 is formed integrally with the first nozzle 210 and the second nozzle 220. As shown in FIG. 10, the first nozzle 210, the second nozzle 220, and the nozzle connection part 240 are formed by screwing together a left nozzle part 240L and a right nozzle part 240R, which are halves of each other. . An O-ring 244 is provided on the outer periphery of the rear end portion 243 of the nozzle connection portion 240 .

The main body portion 250 is the rear portion of the container portion 230. The main body portion 250 is formed into a substantially box shape with an open front end. In this embodiment, the container portion 230 is made of carbon resin. As shown in FIG. 9, the container section 230 has a window section 235 made of a light-transmitting resin. The user can visually check the amount of dust inside the container section 230 through the window section 235.

As shown in FIG. 9, the dust box 200 further includes a detachable section 270 configured to attach and detach the main body section 250 to the nozzle connection section 240. In this embodiment, the attachment/detachment section 270 includes a mounting screw 271 provided on the main body section 250 and an engagement section 245 provided on the nozzle connection section 240 . The mounting screw 271 has a knob 272 and a shaft 273. The engaging portion 245 is configured so that the front end portion 274 of the mounting screw 271 engages (fits).

A cylindrical portion 258 is provided inside the main body portion 250 and extends forward from the rear wall 232 of the container portion 230. The rear end of the cylindrical portion is an opening provided in the rear wall 232. The knob 272 is arranged on the rear side of the rear wall 232 and covers the opening. The shaft 273 is connected to the knob 272 and disposed within the cylindrical portion 258 . The nozzle connection part 240 has a partition wall 241 provided between the first nozzle 210 and the second nozzle 220 in the vertical direction, and the engaging part 245 has an opening provided in the partition wall 241 and an opening provided in the partition wall 241. It is constituted by an engaging member such as a nut 246 disposed inside. The partition wall 241 divides the inside of the nozzle connection part 240 into a space communicating with the first nozzle 210 and a space communicating with the second nozzle 220.

A method for attaching the main body section 250 to the nozzle connection section 240 will be explained. The user aligns the main body part 250 and the nozzle connecting part 240 so that the outer shapes (for example, the side surfaces 233) of the main body part 250 to which the mounting screws 271 are attached are continuous with the nozzle connecting part 240. The user inserts the front end 274 of the shaft 273 into the opening of the engagement part 245 while fitting the front end 253 of the main body part 250 into the rear end 243 of the nozzle connection part 240 . When the user manually operates (rotates) the knob 272, the front end 274 of the shaft 273 is inserted into the opening of the engaging portion 245 and engages (fits) with the engaging portion 245. In this way, the main body part 250 can be attached to the nozzle connection part 240.

The filter member 260 is provided within the container section 230 so as to divide the space within the container section 230 into a first space 281 communicating with the first nozzle 210 and a second space 282 communicating with the second nozzle 220. ing. The filter member 260 is provided at a position closer to the second nozzle 220 than the first nozzle 210. The filter member 260 is formed to allow air to pass therethrough and not to allow dust generated during processing operations to pass therethrough. In this embodiment, a bag-shaped air filter having an opening 261 is used as the filter member 260. The air filter is, for example, a coarse dust filter.

In this embodiment, a frame 262 is disposed inside the filter member 260. The frame 262 is formed to expand the filter member 260 and maintain the bag shape. As shown in FIG. 9, on the inner wall of the nozzle connecting portion 240, above the partition wall 241 and on the rear side of the first nozzle 210, a groove portion 242 for removably fixing the frame 262 is provided. The filter member 260 is fixed to the groove 242 via the frame 262 so that the opening 261 faces the first nozzle 210 side (front side). It can also be said that the filtering member 260 is attached to a portion of the nozzle connecting portion 240 that connects to the second nozzle 220 (second nozzle connecting portion). As shown in FIG. 10, the lower end of the filter member 260 is supported by a plate 247 extending rearward from the partition wall 241. As shown in FIG.

The dust box 200 further includes a string-like ground member 265. The grounding member 265 is a member for bringing the dust box 200 and the ground to the same potential. The ground member 265 has one end in contact with the container section 230 and the other end exposed from the container section 230. The exposed length of the ground member 265 is such that when the sanding surface B1 is placed on the workpiece, the other end of the ground member 265 can come into contact with the workpiece or a member on the same plane as the workpiece. be. In this embodiment, the grounding member 265 is provided at the lower end of the nozzle connection section 240, separated from the space (first space 281) inside the container section 230. The ground member 265 discharges the electric charge accumulated in the dust box 200.

Hereinafter, the manner in which dust is stored in the dust box 200, as well as the effects of the dust box 200 of this embodiment and the effects of the belt sander 1 equipped with the dust box 200 will be described.

When the first nozzle 210 and the second nozzle 220 of the dust box 200 are connected to the discharge nozzle 140 and the suction nozzle 150 of the belt sander 1, respectively, and the dust box 200 is attached to the belt sander 1, the first nozzle 220 of the belt sander 1 The flow path 191 and the first space 281 in the dust box 200 communicate with each other. Further, the second flow path 192 of the belt sander 1 and the second space 282 in the dust box 200 communicate with each other. As described above, since the first space 281 and the second space 282 are separated by the filter member 260, the air in the dust box 200 can move between the first space 281 and the second space 282.

When the belt sander 1 is driven, the fan 3 rotates and sucks air from the back side. At this time, the air around the fan 3 is directed from the suction nozzle 150 to the air outlet 165 by the suction of the fan 3 . That is, the rotation of the fan 3 generates an airflow F2 from inside the dust box 200 toward the air outlet 165 via the second flow path 192 (see FIG. 7). In addition, since the inside of the dust box 200 becomes negative pressure due to the intake air of the fan 3, the airflow F1 toward the inside of the dust box 200 from the dust collection port 19 provided at the rear of the belt drive unit 6 via the first flow path 191 is generated. Occur. Thereby, the dust generated in the processing operation moves from the dust collection port 19 to the first flow path 191, the discharge nozzle 140, the first nozzle 210, and the first space 281 in the container section 230 in this order. The dust that has entered the container section 230 is prevented from moving to the second space 282 by the filter member 260, and thus remains in the first space 281. In this way, dust is stored in the first space 281 of the dust box 200. Furthermore, the air in the dust box 200 passes through the filter member 260 and flows from the first space 281 to the second space 282, the second nozzle 220, the suction nozzle 150, the second flow path 192, and the air outlet 165. They move sequentially and are discharged to the outside of the belt sander 1.

In this way, according to the present embodiment, by connecting the first nozzle 210 and the second nozzle 220 of the dust box 200 to the discharge nozzle 140 and the suction nozzle 150 of the belt sander 1, respectively, and rotating the fan 3, It is possible to generate a rectified flow from the dust collection port 19 of the belt sander 1, through the dust box 200, and toward the air outlet 165 of the belt sander 1. Furthermore, since the filtering member 260 divides the space inside the container section 230 into a first space 281 that communicates with the first nozzle 210 and a second space 282 that communicates with the second nozzle 220, it prevents dust from entering the dust box 200. This can prevent dust from flowing into the housing 10 from the second nozzle 220. Therefore, in the dust box 200 of this embodiment and the belt sander 1 equipped with the dust box 200, the dust collection efficiency can be improved.

Note that, as described above, the first flow path 191 is separated from the space in which each component such as the motor 2, fan 3, and power transmission section 35 is accommodated by the partition wall 101 and the cylindrical wall of the discharge nozzle 140. Therefore, air and dust passing through the first flow path 191 do not flow into the housing portions of the motor 2, fan 3, power transmission portion 35, and the like. Moreover, although air flows into the second flow path 192 from the dust box 200, this air is air from which dust has been filtered by the filter member 260. Therefore, it is possible to suppress dust generated during processing work from adhering to the motor 2, fan 3, and power transmission section 35 in the housing 10. As a result, the life of the belt sander 1 can be extended.

Furthermore, in the dust box 200, the first nozzle 210 through which dust flows is provided below the second nozzle 220 through which air is sucked. Therefore, since it is not necessary to move the dust to the upper part of the container part 230, the path for storing the dust in the container part 230 can be shortened, and the dust collection efficiency can be improved.

The filter member 260 is fixed to a groove 242 provided on the rear side of the second nozzle 220 via a frame 262. That is, the filter member 260 is provided at a position closer to the second nozzle 220 than the first nozzle 210. Therefore, the first space 281 in which dust is stored can be made larger than the second space 282 that communicates with the second nozzle 220.

Further, the first nozzle 210 and the second nozzle 220 are arranged in the vertical direction and open rearward. Therefore, by opening the first nozzle 210 and the second nozzle 220 in different directions, it is possible to prevent the air flow within the container section 230 from becoming complicated. Therefore, the airflow within the container section 230 can be further rectified, so that the dust collection efficiency can be further improved.

Further, the container section 230 includes a nozzle connection section 240 that is connected to the first nozzle 210 and the second nozzle 220, and a main body section 250 that is detachably attached to the nozzle connection section 240. , are provided at the nozzle connection section 240. Therefore, by removing the main body part 250 from the nozzle connection part 240, the dust accumulated in the container part 230 can be removed.

Dust that is prevented from moving by the filter member 260 when air moves into the filter member 260 (second space 282) may adhere to the outer surface of the filter member 260. However, in this embodiment, since the filtration member 260 is attached to the nozzle connection part 240, when the user removes the main body part 250 from the nozzle connection part 240, the user can easily remove dust attached to the outer surface of the filtration member 260. can be removed. Therefore, it is possible to prevent the filter member 260 from being covered with dust, thereby further improving the dust collection efficiency.

The dust box 200 includes a detachable section 270 that is configured to attach and detach the main body section 250 to and from the nozzle connection section 240 . Therefore, the user does not need to separately prepare a tool for attaching and detaching the main body section 250 to the nozzle connecting section 240, and therefore, the convenience of using the dust box 200 can be improved.

In the belt sander 1, since dust passes through the first flow path 191 in the housing 10, static electricity is likely to be generated due to friction between the dust and the housing 10. However, the dust box 200 of this embodiment includes a grounding member 265, one end of which contacts the container section 230 made of conductive synthetic resin, and the other end of which is exposed from the container section 230. Therefore, the generated static electricity can be discharged via the grounding member 265. Therefore, it is possible to prevent dust from accumulating in predetermined locations due to static electricity, thereby further improving dust collection efficiency.

The dust box 200 is configured to fit within the vertical and horizontal widths of the housing 10 when attached to the belt sander 1. Therefore, it is possible to prevent the dust box 200 from coming into contact with walls or objects located on the left and right sides of the belt sander 1 and limiting the processing range of the belt sander 1. Furthermore, when the belt sander 1 is used in the second usage mode, it is possible to suppress the dust box 200 from coming into contact with a desk or the like on which the belt sander 1 is placed.

<Other forms of the dust box and other forms of the belt sander for storing dust in the dust box>
If the dust box 200 includes a first nozzle 210 connectable to the discharge nozzle 140, a second nozzle 220 connectable to the suction nozzle 150, a container section 230, and a filtering member 260, the dust box 200 can be used in a manner other than the embodiments described above. The shape, material, etc. may be adopted. For example, the container portion 230 may be shaped like a vinyl bag. Further, the filter member 260 may be configured to allow air to pass therethrough and not allow dust generated during processing operations of the belt sander 1 to pass therethrough.

In the embodiment described above, the opening 261 of the filtration member 260 was attached to the part of the nozzle connection part 240 that connects to the second nozzle 220 (second nozzle connection part). 220.

<Switch mechanism configuration>
Next, the overall configuration of the switch mechanism 8 will be explained. The switch mechanism 8 is a mechanism for switching between driving and stopping the belt sander 1 by switching between driving and stopping the motor 2 through manual operation by a user. As shown in FIG. 6, the switch mechanism 8 includes a first switch 80, a second switch 90, a first lock switch 85, and a second lock switch 95. 14 to 18, a plane P1 that includes the long axis of the handle 14 and is perpendicular to the left-right direction is shown as a virtual plane for explaining the structure of the switch mechanism 8. FIG. 12 shows the switch mechanism 8 cut along the plane P1 when the belt sander 1 is stopped (at all times).

As shown in FIG. 12, a portion of the first switch 80 protrudes downward from an opening 144 provided at the front lower part of the handle 14. The first switch 80 is configured to be able to be pulled on the handle 14 . The first switch 80 is also called a pull-in switch or a trigger switch. A portion of the second switch 90 protrudes upward from an opening 149 provided at the rear upper part of the handle 14. The second switch 90 is configured to be able to be pressed on the handle 14 . The first switch 80 and the second switch 90 are configured as momentary switches.

As shown in FIGS. 4 and 12, the first lock switch 85 is provided in front of the handle 14 so as to act on the first switch 80. As shown in FIGS. The first lock switch 85 is configured to perform a function of restricting the first switch 80 from being in the on state (a function of maintaining the off state of the first switch 80, a lock-off function). Further, the first lock switch 85 is configured to perform a function of maintaining the first switch 80 in an on state (lock-on function). The first lock switch 85 is also called a lock-off/lock-on switch. The second lock switch 95 is provided at the rear left of the handle 14 so as to act on the second switch 90. The second lock switch 95 is configured to maintain the on state of the second switch 90 (lock-on function). The second lock switch 95 is also called a lock-on switch.

The controller 5 is configured to rotate the motor 2 when both the first switch 80 and the second switch 90 are in the on state. The controller 5 is configured to stop the rotation of the motor 2 when at least one of the first switch 80 and the second switch 90 is in an off state.

As described above, the user can use the belt sander 1 of this embodiment in the first usage mode and the second usage mode. The first usage mode is a normal usage mode in which the sanding surface B1 is placed on the workpiece, the user grips the handle 14, and performs the processing work. In the second usage mode, the belt sander 1 is placed upside down with the sanding surface B1 facing vertically upward, and placed on a stand or desk, for example, and the user grips the workpiece and presses it against the sanding belt B. This is a mode in which processing work is performed. The second lock switch 95 is a switch mainly used in the second usage mode.

<Configuration of first switch>
First, the first switch 80 will be explained. As shown in FIGS. 12 and 13, the first switch 80 includes a first switch operating section 81 and a first main switch 82. As shown in FIGS.

The first main switch 82 is held within the handle 14 of the main body housing 11. The first main switch 82 includes a main body 821 electrically connected to the controller 5, and a plunger 822 that is exposed downward from the lower part of the main body 821 and is movable in a substantially vertical direction. The first main switch 82 is turned on (on state) when the length of the exposed portion of the plunger 822 is equal to or less than a predetermined threshold, and is turned off (off state) when the length of the exposed portion of the plunger 822 exceeds a predetermined threshold. . The main body section 821 outputs an on signal to the controller 5 when the first main switch 82 is on.

The first switch operation section 81 is configured to allow manual operation by the user. The first switch operating section 81 is movable between a first on position and a first off position. In FIG. 13, the first switch operating portion 81 in the first on position is shown by a solid line, and the first switch operating portion 81 in the first off position is shown by a broken line. The first on position is a position of the first switch operating section 81 where the first main switch 82 is turned on by the first switch operating section 81 acting on the first main switch 82 . The first OFF position is a position of the first switch operating section 81 that turns the first main switch 82 into an OFF state. The first switch operating section 81 is normally in the first off position. The operation of moving the first switch operating portion 81 to the first on position and the first off position is also referred to as an on operation and an off operation, respectively. In this embodiment, the ON operation of the first switch operation section 81 is a pull operation. The off operation of the first switch operation section 81 is the cancellation of the pull operation.

The configuration of the first switch operation section 81 will be specifically explained. The first switch operation section 81 has a base section 811, a boss section 814, and a projection section 815. The base portion 811 is a portion extending from the front of the first main switch 82 to below the plunger 822. A portion of the base 811 protrudes downward from an opening 144 provided at the lower front portion of the handle 14. The protruding portion has an outer shape that conforms to the user's fingers. The base 811 has a contact portion 812 (see FIG. 12) that contacts the lower end of the plunger 822. The protrusion 815 is formed into a substantially thick plate shape that protrudes upward from the front portion of the base 811 . As shown in FIGS. 14 to 16, the protrusion 815 is located approximately at the center of the handle 14 in the left-right direction, and the plane P1 passes through the protrusion 815. The boss portion 814 extends in the left-right direction at the front portion of the base portion 811 and is supported by the handle 14 . The boss portion 814 is rotatable with respect to the handle 14.

When the ON operation of the first switch operating section 81 is not restricted by the first lock switch 85, the first switch operating section 81 is pulled into the opening 144 by the user's pulling operation. At this time, the first switch operation section 81 rotates clockwise around the boss section 814. As a result, the first switch operating portion 81 shifts from the state shown by the broken line in FIG. 13 to the state shown by the solid line, and the protrusion 815 moves forward. Further, the contact portion 812 pushes the plunger 822. When the contact portion 812 pushes the plunger 822, the first main switch 82 (first switch 80) is turned on. The first on position is also the position of the first switch operating portion 81 where the length of the exposed portion of the plunger 822 is equal to or less than a predetermined threshold.

When the pulling operation of the first switch operation part 81 is released, the first switch operation part 81 rotates counterclockwise around the boss part 814 and returns to its original position, and the protrusion part 815 moves backward. do. Further, the contact portion 812 releases the plunger 822 from being pushed. As a result, the first switch 80 is turned off. The first off position is also the position of the first switch operating portion 81 where the length of the exposed portion of the plunger 822 is greater than a predetermined threshold.

The first switch 80 further includes a biasing member 818 that biases the first switch operating portion 81 to the first off position. In this embodiment, a compression coil spring is employed as the biasing member 818. As shown in FIG. 12, one end of the biasing member 818 is supported by the base 811 at the rear of the boss portion 814 and at the front of the contact portion 812. The other end of the biasing member 818 is supported by the inner wall of the handle 14. When the first switch operating portion 81 is pulled against the biasing force of the biasing member 818 and positioned at the first on position, the first switch 80 is turned on. Further, when the pulling operation of the first switch operating portion 81 is released, the first switch operating portion 81 returns to the first off position due to the urging force of the urging member 818, and thereby the first switch 80 is turned off. become a state.

<Configuration of the first lock switch>
Next, the first lock switch 85 will be explained. The first lock switch 85 is manually operated by the user to move to a lock-off position that restricts the ON operation of the first switch operation section 81 and a lock-off release position that allows the ON operation of the first switch operation section 81. . The lock-off release position includes a lock-on position in which the first switch 80 is kept on. The first lock switch 85 is normally positioned at the lock-off position. 12 and 14 show a state in which the first lock switch 85 is located in the lock-off position (lock-off state), and FIGS. 15 and 16 show a state in which the first lock switch 85 is located in the lock-on position. This shows the locked state (lock-on state).

As shown in FIG. 14, the first lock switch 85 includes an operating shaft portion 851, a lock-off locking portion 853, lock-on locking portions 855L and 855R, and a biasing member 858. The first lock switch 85 is configured as a push operation section that can be pushed into the handle 14 .

The operation shaft portion 851 is a member that generally extends in the left-right direction. As shown in FIG. 14, in the lock-off state, a substantially central portion of the operating shaft portion 851 in the left-right direction appears on the plane P1. Normally, the left end and right end of the operating shaft portion 851 protrude from openings 145L and 145R provided in the left side (left wall 14L) and right side (right wall 14R) of the handle 14, respectively. The left end and right end of the operating shaft section 851 function as operating sections 851L and 851R, respectively. The first lock switch 85 is disposed within the reach of the user's finger when operating the first switch operating section 81 . Specifically, the operating section 851R is disposed within the reach of the user's right thumb when the user grips the handle 14 with his right hand so as to pull the first switch operating section 81 with his right fingers. Further, the operating section 851L is arranged within a range that the user's left thumb can reach when the user grasps the handle 14 with his left hand so as to pull the first switch operating section 81 with his left fingers.

The lock-off retaining portion 853 is configured to come into contact with the protrusion 815 of the first switch operating portion 81 and restrict the pulling operation of the first switch operating portion 81 . In this embodiment, a rearwardly recessed recessed portion 854 is provided in the center portion of the operation shaft portion 851 in the left-right direction. The lock-off engaging portion 853 is formed in a thick plate shape and protrudes from the central front portion of the recessed portion 854 toward the lower front.

The lock-on retaining portions 855L and 855R are provided at the left end and right end of the recessed portion 854, respectively, and spaced apart from the lock-off retaining portion 853. The lock-on retaining portions 855L and 855R are located rearward of the lock-off retaining portion 853 in the front-rear direction. The lock-on engaging portions 855L and 855R are each formed into a thick plate shape that projects downward. The distance between the lock-on locking portion 855L and the lock-off locking portion 853 in the left-right direction, and the distance between the lock-on locking portion 855R and the lock-off locking portion 853 in the left-right direction of the protrusion 815, respectively. greater than thickness. Therefore, when the protruding portion 815 (first switch operating portion 81) is disengaged from the lock-off retaining portion 853, it becomes rotatable (lock-off released state). Note that when the engagement is released, the first switch operating portion 81 is such that the rear wall (rear surface) of the projection portion 815 is forward of the front wall (front surface) of the lock-on retaining portions 855L, 855R in the front-rear direction. It can be rotated until it is located at .

The operation shaft portion 851 further includes restriction walls 854L and 854R. The regulating walls 854L and 854R define the left and right ends of the recessed portion 854. The regulating wall 854L is provided on the left front side of the lock-on retaining portion 855L. The regulating wall 854L comes into contact with the left side surface of the protrusion 815 when the first lock switch 85 is pushed to the right. Thereby, the regulating wall 854L regulates the rightward movement of the first lock switch 85, and positions the lock-on retaining portion 855L directly behind the protrusion 815. The regulating wall 854R is provided on the right front side of the lock-on retaining portion 855R. The regulating wall 854R comes into contact with the right side surface of the protrusion 815 when the first lock switch 85 is pushed to the left. Thereby, the regulating wall 854R regulates the leftward movement of the first lock switch 85 and positions the lock-on retaining portion 855R directly behind the protrusion 815.

The biasing member 858 is provided at the rear of the operating shaft portion 851. The biasing member 858 is arranged along the left-right direction. The biasing member 858 is configured to bias the first lock switch 85 to the lock-off position. In this embodiment, a compression coil spring is employed as the biasing member 858.

In this embodiment, a holding portion 859 that is formed integrally with the operating shaft portion 851 and holds the biasing member 858 is provided at the rear of the operating shaft portion 851 . The left and right ends of the biasing member 858 are held by the left and right walls of a holding portion 859, respectively. The left wall and right wall of the holding portion 859 each have an opening. Projections 149L and 149R protruding from the left and right walls of the handle 14 are in contact with the left and right ends of the biasing member 858 through the openings of the holding portion 859, respectively. As shown in FIG. 15, when the operation shaft section 851 moves to the left, the biasing member 858 moves to the left together with the holding section 859. At this time, the right end of the biasing member 858 is supported by the right wall of the holding portion 859, while the left end of the biasing member 858 is supported by the projection 149L, so that the biasing member 858 is contracted. Further, as shown in FIG. 16, when the operating shaft portion 851 moves to the right, the biasing member 858 moves to the right together with the holding portion 859. At this time, the left end of the biasing member 858 is supported by the left wall of the holding portion 859, while the right end of the biasing member 858 is supported by the projection 149R, so that the biasing member 858 is contracted.

As described above, the first lock switch 85 is normally positioned at the lock-off position. As shown in FIG. 14, the lock-off position is a position of the first lock switch 85 where the lock-off locking portion 853 is located directly behind the protrusion 815. In the lock-off position, the lock-off stop portion 853 is located on the plane P1. The first lock switch 85 can be moved to the first lock-on position shown in FIG. 15 by being pushed to the right by a user's manual operation. The first lock-on position is a position of the first lock switch 85 where the lock-on stopper 855R is located directly behind the protrusion 815. At the first lock-on position, the lock-on retaining portion 855R is located on the plane P1. Further, the first lock switch 85 can be moved to the second lock-on position shown in FIG. 16 by being pushed to the left by a user's manual operation. The second lock-on position is a position of the first lock switch 85 where the lock-on stopper 855L is located directly behind the protrusion 815. At the second lock-on position, the lock-on retaining portion 855L is located on the plane P1.

<How to operate the first switch and first lock switch>
As shown in FIGS. 12 and 14, when the first lock switch 85 is in the lock-off position, the rear wall of the lock-off locking part 853 comes into contact with the front wall of the protrusion 815 of the first switch operation part 81. (engagement, interference). Thereby, the lock-off retaining portion 853 restricts the forward movement of the projection portion 815, that is, the pulling operation of the first switch operation portion 81 (lock-off state).

When the user pushes the operating portion 851R into the handle 14, the first lock switch 85 moves to the left from the lock-off position. Then, the engagement between the lock-off retaining portion 853 and the projection portion 815 of the first switch operating portion 81 is released (lock-off released state). As a result, the protrusion 815 can be rotated clockwise, and the first switch operating section 81 can be pulled (on-operated). Note that when the user pulls the first switch operation part 81, the protrusion part 815 rotates clockwise and can move forward of the lock-on retaining part 855R in the front-rear direction.

When the user further pushes the first lock switch 85 to the left, the first lock switch 85 moves to the left to a position where the restriction wall 854R abuts the right side surface of the protrusion 815, as shown in FIG. A lock-on retaining portion 855R is provided on the rear left side of the regulating wall 854R, so when the regulating wall 854R comes into contact with the right side surface of the protrusion 815, the lock-on retaining portion 855R locks directly behind the protrusion 815. It will be located in That is, the first lock switch 85 is positioned at the first lock-on position.

When the user releases the pull operation (on operation) of the first switch operation section 81, a biasing force toward the first OFF position is applied to the first switch operation section 81 by the biasing member 818 (see FIG. 12). . However, the rear wall (rear surface) of the protrusion 815 engages with the front wall (front surface) of the lock-on engaging portion 855R, and restricts the movement of the first switch operating portion 81 to the first OFF position. As a result, the first switch operating section 81 is maintained at the first on position. Therefore, even if the user releases the pull operation on the first switch operation section 81, the on operation is maintained (lock-on state). Note that at this time, the biasing member 858 of the first lock switch 85 contracts as shown in FIG. 15, and biases the first lock switch 85 to the lock-off position. However, the biasing member 818 of the first switch 80 moves the protrusion 815 of the first switch operation part 81 (the first switch operation part 81) in the direction toward the first off position (the protrusion 815 rotates counterclockwise). direction). Therefore, the biasing force of the biasing member 818 acts on the lock-on retaining portion 855R via the protrusion 815, and the engagement between the protrusion 815 and the lock-on retaining portion 855R is maintained. In this way, the first lock switch 85 remains in the first lock-on position.

As shown in FIG. 15, in a state where the first lock switch 85 is positioned at the first lock-on position and the first switch operation section 81 is maintained in the on operation, the user further presses the first switch operation section 81. When pulled, the protrusion 815 rotates clockwise. As a result, the protruding portion 815 separates from the lock-on retaining portion 855R, and the engagement between the protruding portion 815 and the lock-on retaining portion 855R is released. Therefore, the first lock switch 85 returns to the lock-off position by the urging force of the urging member 858 (see FIG. 14). Further, the first switch operating portion 81 returns to the first off position by the urging force of the urging member 818.

The manner in which the user moves the first lock switch 85 from the lock-off position to the second lock-on position is also similar to the above. That is, when the user pushes the operating portion 851L into the handle 14, the first lock switch 85 moves to the right from the lock-off position. Then, the engagement between the lock-off retaining portion 853 and the projection portion 815 of the first switch operating portion 81 is released. When the user pulls the first switch operating section 81 (on-operates), the protrusion 815 can move forward of the lock-on retaining section 855L in the front-rear direction.

When the user further pushes the first lock switch 85 to the right, the first lock switch 85 moves to the right to a position where the restriction wall 854L abuts the left side surface of the protrusion 815, as shown in FIG. A lock-on retaining portion 855L is provided on the right rear side of the regulating wall 854L, so when the regulating wall 854L comes into contact with the left side surface of the protrusion 815, the lock-on retaining portion 855L is immediately behind the protrusion 815. It will be located in That is, the first lock switch 85 is positioned at the second lock-on position.

When the user releases the pull operation (on operation) of the first lock switch 85, a biasing force toward the first OFF position is applied to the first switch operating portion 81 by the biasing member 818. However, the rear wall of the protrusion 815 comes into contact with the front wall of the lock-on stopper 855L, and restricts the movement of the first switch operation part 81 to the first OFF position. As a result, the first switch operation section 81 is maintained at the first on position, and even if the user releases the pull operation of the first lock switch 85, the on operation of the first switch operation section 81 is maintained (the first 1 switch 80 lock-on state). Note that the biasing force of the biasing member 818 acts on the lock-on retaining portion 855L (first lock switch 85) via the protrusion 815. Due to the action of this biasing force, the first lock switch 85 remains in the second lock-on position.

As shown in FIG. 16, in a state where the first lock switch 85 is positioned at the second lock-on position and the first switch operation section 81 is maintained in the on operation, the user further presses the first switch operation section 81. When the retracting operation is performed, the protrusion 815 rotates clockwise. As a result, the engagement between the protrusion 815 and the lock-on retaining portion 855R is released. Therefore, the first lock switch 85 returns to the lock-off position by the urging force of the urging member 858 (see FIG. 14). Further, the first switch operating portion 81 returns to the first off position by the urging force of the urging member 818.

As described above, when the first switch 80 is in the lock-on state (see FIGS. 15 and 16), the user can pull the first switch operation part 81 and then release the pull operation to operate the first switch 80. The first switch 80 can be turned off and the first switch 80 can be moved to the lock-off state.

<Configuration of second switch>
Next, the second switch 90 will be explained. As shown in FIG. 12, the second switch 90 includes a second switch operating section 91 and a second main switch 92.

The second main switch 92 is held within the handle 14 of the main body housing 11 behind the first switch 80. The second main switch 92 includes a main body 921 electrically connected to the controller 5 and an actuator 922 that projects upward from the top of the main body 921. The actuator 922 is pushed into the main body portion 921 by being pressed downward. The second main switch 92 is turned on (on state) when the amount of push (pressure) of the actuator 922 against the main body portion 921 is equal to or greater than a predetermined threshold, and is turned off (off state) when the amount of push against the main body portion 921 is less than a predetermined threshold. become. The main body section 921 outputs an on signal to the controller 5 when the second main switch 92 is on.

The second switch operation section 91 is provided at the rear of the first switch operation section 81 and the first lock switch 85. The second switch operating section 91 is provided below a virtual plane P2 (see FIG. 6) that includes the upper wall 121 of the first portion 12 (motor accommodating section). As shown in FIG. 12, the second switch operation part 91 is arranged on the handle 14 so that a part thereof protrudes upward from an opening 149 provided at the rear upper part of the handle 14, and is arranged in a substantially vertical direction. Move to. The second switch operation section 91 is configured to be manually operated by the user. The second switch operating section 91 is movable between a second on position and a second off position. In FIG. 17, the second switch operating portion 91 in the second on position is shown by a solid line, and the second switch operating portion 91 in the second off position is shown by a broken line. The second on position is a position of the second switch operating section 91 where the second switch operating section 91 acts on the second main switch 92 to drive the motor 2 . The second OFF position is a position of the second switch operating section 91 that stops driving the motor 2. The second switch operating section 91 is normally in the second off position. The operation of moving the second switch operation section 91 to the second on position and the second off position is also referred to as an on operation and an off operation, respectively. In this embodiment, the ON operation of the second switch operation section 91 is a push operation. The off operation of the second switch operation section 91 is the release of a push operation.

The configuration of the second switch operation section 91 will be specifically explained. The second switch operation unit 91 includes a base 911 , a rotation shaft 916 extending in the left-right direction and whose left and right ends are supported by the handle 14 , and a biasing member 918 . The base 911 is arranged above and in front of the second main switch 92 and extends in the front-rear direction. The rear portion of the base 911 projects downward. A contact portion 912 that can come into contact with the upper end portion of the actuator 922 is provided at the rear lower portion of the base portion 911 .

Normally, a portion of the base 911 protrudes upward from an opening 149 provided at the rear upper portion of the handle 14 (see FIG. 12). The protruding portion has a dorsal fin shape. A shaft hole 915 extending in the left-right direction is provided at the front end of the base 911 . A rotating shaft 916 is inserted through the shaft hole 915 . The base 911 is rotatable around a rotation shaft 916. The base 911 is rotated counterclockwise (downward) by a push operation by the user and is pushed into the opening 149.

The base 911 is formed into a block shape with a space inside. As shown in FIG. 12, an opening 917 is provided in the left wall portion 911L of the base portion 911. As shown in FIG. Although the details will be described later, the opening 917 is formed in a position and size that allows the locking portion 954 of the second lock switch 95 to be inserted and placed into the internal space of the base portion 911.

The biasing member 918 is configured to bias the second switch operating portion 91 to the second OFF position. In this embodiment, a torsion spring is employed as the biasing member 918. A coil portion of torsion spring 918 is provided on rotation shaft 916. A support wall 142 is provided inside the handle 14 and extends from the front of the base 911 to the rear lower part, and one arm 918f of the torsion spring 918 is fixed to the support wall 142. The other arm (not shown) of the torsion spring 918 is fixed to the base 911 and urges the base 911 upward (clockwise).

The second switch operation section 91 is pushed into the opening 149 by a user's push operation. At this time, the second switch operating section 91 rotates counterclockwise around the rotation shaft 916. As a result, the contact portion 912 moves downward and pushes the actuator 922, and the second main switch 92 (second switch 90) is turned on. The second on position is also the position of the second switch operating section 91 where the amount of pushing (pressing) of the actuator 922 is equal to or greater than a predetermined threshold.

When the pulling operation of the second switch operation part 91 is released, the second switch operation part 91 rotates clockwise around the rotation shaft 916 and returns to its original position due to the biasing force of the torsion spring 918. , the contact portion 912 releases the actuator 922 from being pressed. As a result, the second switch 90 is turned off. The second OFF position is also the position of the second switch operating section 91 where the amount of pushing (pressing) of the actuator 922 is less than a predetermined threshold.

<Configuration of second lock switch>
The second lock switch 95 is provided at the rear of the handle 14 so as to act on the second switch 90. The second lock switch 95 is located behind the first lock switch 85 in the front-rear direction, and located below the first lock switch 85 in the vertical direction. As shown in FIG. 18, a portion of the second lock switch 95 is exposed through an opening 147 provided in the left wall 14L of the handle 14. The second lock switch 95 is normally positioned at the off position (non-lock on position) (see FIG. 18). The second lock switch 95 can be moved to the lock-on position, where the second switch operation section 91 is kept on, by manual operation by the user (see FIG. 19).

As shown in FIGS. 18 and 19, a recessed portion 146 recessed toward the right side is provided in the left wall 14L of the handle 14 at a position corresponding to the rear portion of the second switch operating portion 91. As shown in FIGS. The second lock switch 95 is arranged in the recessed part 146. The recessed portion 146 is formed in a multi-stage circular shape with an inner diameter decreasing toward the right side. An opening 147 is located approximately at the center of the recessed portion 146 . The recessed portion 146 has a first flange 146a and a second flange 146b that are perpendicular to the left-right direction. The second flange 146b is an annular wall provided around the opening 147. The first flange 146a is an annular wall provided on the left side of the second flange 146b and around the second flange 146b.

The second lock switch 95 includes a stepped pin 953, an operating portion 951 provided at the left end of the stepped pin 953, and a biasing member 958.

The stepped pin 953 generally extends in the left-right direction and is movable in the left-right direction. The stepped pin 953 is arranged on the handle 14 so that it can be inserted into the opening 917 of the base 911 when the second switch operating section 91 is pressed. The stepped pin 953 is inserted into the opening 147 with its right end disposed within the handle 14 and its left end disposed within the recess 146 (on the left side of the opening 147). The outer diameter of the right end of the stepped pin 953 is larger than the diameter of the opening 147. This prevents the stepped pin 953 from coming off the handle 14. Further, although details will be described later, the right end portion of the stepped pin 953 functions as a locking portion 954 that locks onto the second switch operation portion 91 and maintains the second switch operation portion 91 in the second on position. .

The operating portion 951 is formed into a cap shape that fits into the left end portion of the stepped pin 953. The operating portion 951 is movable in the left-right direction together with the stepped pin 953. The outer diameter of the operating portion 951 is larger than the second flange 146b and smaller than the first flange 146a. Therefore, movement of the operating portion 951 to the right is restricted by the first flange 146a. Unlike the first lock switch 85, the operating portion 951 of the second lock switch 95 does not protrude to the left beyond the left wall 14L around the recessed portion 146 in the left-right direction.

The biasing member 958 is configured to bias the second lock switch 95 to the non-lock-on position. In this embodiment, a compression coil spring is employed as the biasing member 958. Biasing member 958 is disposed on stepped pin 953. The left end of the biasing member 958 is supported by the flange 952 of the operating section 951, and the right end is supported by the second flange 146b.

<How to operate the second switch and second lock switch>
As shown in FIGS. 12 and 18, at normal times, a part of the second switch operation part 91 (base 911) protrudes upward from the handle 14 through the opening 147 provided in the handle 14 (the second off position). As described above, the second switch operating section 91 is pushed into the opening 149 by the user's push operation and moves to the second on position, and the second main switch 92 (second switch 90) is turned on.

When the user pushes the operating part 951 of the second lock switch 95 into the handle 14 while the second switch operating part 91 is being pressed, the locking part 954 of the second lock switch 95 is locked when the second switch is operated. It is inserted into the internal space of the base 911 through an opening 917 provided in the base 911 of the portion 91 . Then, when the push operation of the second switch operating portion 91 is released, the second switch operating portion 91 is urged to the original position (second OFF position) by the urging force of the torsion spring 918. However, before the second switch operation part 91 leaves (moves) from the second on position, the locking part 954 of the stepped pin 953 engages with the left wall part 911L around the opening 917 in the base part 911 ( (See Figure 19). As a result, the second switch operating section 91 is maintained at the second on position (lock-on state). Further, although the second lock switch 95 is biased toward the non-lock-on position by the biasing member 958, it remains in the lock-on position due to the engagement between the locking portion 954 and the base portion 911. As described above, even if the user releases his or her fingers from the second switch operating section 91 and the second lock switch 95, the second switch 90 is maintained in the on state.

In the above lock-on state, when the user presses and operates the second switch operating section 91, the second switch operating section 91 rotates counterclockwise (downward) and engages the locking portion 954 of the stepped pin 953 and the base. 911 is disengaged from the left wall portion 911L. As a result, the second lock switch 95 returns to the non-lock-off position due to the urging force of the urging member 958 (see FIG. 18). Further, the second switch operation section 91 returns to the second OFF position by the urging force of the urging member 918. That is, in the lock-on state, the user can turn off the second switch 90 by simply pressing the second switch operation section 91 and then releasing the pressing operation.

The switch mechanism 8 described above can be operated as follows in the first usage mode and the second usage mode, respectively. In the first usage mode, the user presses and operates the second switch operating section 91 with, for example, his left hand. Then, by pressing the operating portion 851R of the first lock switch 85 with the thumb of the right hand while placing the right hand on the first switch operating portion 81, the lock-off state of the first switch 80 can be released. Then, by pulling in the first switch operating portion 81 with the right hand and further pushing the operating portion 851R of the first lock switch 85 with the thumb of the right hand, the first switch 80 can be maintained in the on state (locked on state). ). Note that the user presses and operates the second switch operation section 91 with his right hand, and while placing his left hand on the first switch operation section 81, presses the operation section 851L of the first lock switch 85 with his left thumb, and then presses the operation section 851L of the first lock switch 85. You can also put it in a locked state. In this state, when the user releases the belt sander 1, the second switch operating section 91 returns to the second off position, and the second switch 90 is turned off. Therefore, the user can stop the belt sander 1 simply by releasing the push operation on the second switch operation section 91.

In the second usage mode, the user presses the second switch operating portion 91 (moves it to the second on position) and pushes the second lock switch 95 to place the second switch 90 in the lock-on state. Note that the user can put the first switch 80 into the lock-on state by operating the first switch operating section 81 and the first lock switch 85 in the same manner as in the first usage mode. Thereby, the user can take his hand off the belt sander 1, grip the workpiece, and perform the work. Note that, as described above, the user can turn off the second switch 90 by simply pressing the second switch operation part 91 and then releasing the press operation, thereby stopping the belt sander 1. can be done.

As explained above, in the belt sander 1 of this embodiment, the first lock switch 85 can maintain the first switch 80 in the on state, and the second lock switch 95 can maintain the second switch 90 in the on state. Therefore, in the second usage mode, the belt sander 1 of this embodiment can stably continue driving the motor 2 even when the belt sander 1 is placed on a somewhat uneven surface.

Further, in the lock-off state, the operating portions 851L and 851R of the first lock switch 85 protrude from the left and right walls 14L and 14R of the handle 14, respectively, and the operating portion 951 of the second lock switch 95 protrudes from the left wall of the handle 14. It is arranged in a recessed part 146 provided in 14L. Therefore, in the second usage mode, it is easy to operate the first lock switch 85 and the second lock switch 95 in succession. Therefore, in the second usage mode, the operability of driving the belt sander 1 can be further improved.

Further, in the belt sander 1, the upper wall 121 of the portion (first portion 12) of the housing 10 in which the motor 2 is accommodated is approximately parallel to the sanding belt B, and the second switch operating portion 91 It is provided below the containing virtual plane P2. Therefore, in the second usage mode, the posture of the belt sander 1 can be stabilized by placing the upper wall 121 on a desk, stand, or the like.

Further, the first lock switch 85 is made to exhibit a function of preventing the first switch 80 from being turned on (lock-off function) in addition to a function of maintaining the first switch 80 in the on state (lock-on function). be able to. Therefore, by separately providing a switch that exhibits a lock-off function, it is possible to prevent the operation of the switch mechanism from becoming complicated and the belt sander from increasing in size. That is, according to the present embodiment, it is possible to improve the operability of driving the belt sander 1 and to make the belt sander 1 more compact.

Furthermore, since the second switch operating section 91 protrudes from above the handle 14, the user can turn on the second switch 90 by pushing in the second switch operating section 91 from above. Therefore, even in the first usage mode, the operability of driving the belt sander 1 can be improved.

Further, the second switch operating portion 91 returns to the second off position upon release of the user's push operation, so even if the user takes his hand off the belt sander 1 in the first usage mode, the belt sander 1 It is possible to prevent the sander 1 from moving on its own.

The second lock switch 95 moves in the left-right direction that intersects with the moving direction (substantially up and down) of the second switch operation part 91. Therefore, when the user operates the second switch operating section 91, it is possible to prevent the second lock switch 95 from being operated unintentionally due to the user's finger touching the second lock switch 95 carelessly. . In this embodiment, the second lock switch 95 is configured so as not to protrude to the outside of the handle 14 (to the left of the left wall 14L). Thereby, it is possible to further prevent the second lock switch 95 from being operated unintentionally.

<Other forms of switch mechanism>
The first switch 80 and the second switch 90 may have a configuration other than the above as long as they are configured as momentary switches. For example, the first switch operation section 81 and the second switch operation section 91 are configured as slide operation sections that are moved to first and second on positions and first and second off positions by a user's slide operation. It's okay. Similarly, the first lock switch 85 and the second lock switch 95 may have a configuration other than the above, as long as they are configured so that the ON operation of the first switch 80 and the second switch 90, respectively, can be continued. .

In the embodiments described above, compression coil springs are used as the biasing members 818, 858, and 958, and torsion springs are used as the biasing member 918. On the other hand, other biasing members (elastic bodies) may be employed as the biasing members 818, 858, 918, and 958.

In the embodiment described above, the second lock switch 95 was provided on the left wall 14L of the handle 14. On the other hand, the second lock switch 95 may be provided on the right wall 14R of the handle 14, or may be provided on the left and right walls 14L, 14R, respectively.

<Configuration of battery mounting part>
Next, the configuration of the battery mounting section 4 will be explained using FIGS. 1 to 5 and FIG. 20. The battery mounting section 4 is provided above the belt drive section 6 (on the second portion 13 of the main body housing 11). The battery mounting section 4 is configured such that the rechargeable battery 300 having a well-known configuration is slid in the sliding direction with respect to the battery mounting section 4, so that the battery 300 can be attached or removed.

First, an example of a battery that can be attached to and detached from the battery mounting section 4 will be described. A battery 300 shown in FIG. 20 is an example of a battery pack mounted on the battery mounting section 4. In FIG. 20, the battery 300 includes a case 310 that accommodates a plurality of battery cells, and a mounting section 320 that is detachable from the battery mounting section 4. The mounting section 320 has a mounting surface 321 that faces the mounting surface 41 of the battery mounting section 4 when the battery 300 is mounted on the battery mounting section 4 . In FIG. 20, regarding the direction of the battery 300, the direction in which the mounting surface 321 is provided with respect to the case 310 is defined as the lower side, and the opposite side is defined as the upper side. Further, the sliding direction of the battery 300, which is a direction intersecting the vertical direction, is defined as the front-back direction, and in the front-back direction, the side where 305, which will be described later, is provided is defined as the front side, and the opposite side is defined as the rear side. Furthermore, a direction intersecting the up-down direction and the front-back direction is defined as the left-right direction.

The mounting section 320 has a mounting surface 321, a pair of rail receiving sections 322, a pair of power terminals 324, and a signal terminal 326. The mounting surface 321 is a surface that faces the mounting surface 41 (details will be described later) of the battery mounting section 4 when the battery 300 is mounted on the battery mounting section 4 of the belt sander 1. In this embodiment, the mounting surface 321 is the lower surface of the case 310, and includes the lower surface of the portion (protrusion 311) where the lower front portion of the case 310 protrudes downward. The mounting surface 321 is a surface substantially parallel to the front-rear direction and the left-right direction. The battery 300 is formed into a rectangular box shape whose width in the vertical direction is smaller than the width in the front-rear direction and the width in the left-right direction. The battery 300 (case 310) has long sides in the sliding direction. The surface (top surface 312) opposite to the mounting surface 321 has the largest area of the battery 300. The pair of rail receiving parts 322 are provided on the left and right side surfaces of the protruding part 311 and extend in the long side direction (front-back direction) of the case 310. The pair of rail receiving parts 322 are configured to be able to engage with guide rails 42 (see FIG. 4) provided in the battery mounting part 4.

The mounting portion 320 further includes a locking member 305 provided at the front lower part of the protrusion 311 . The locking member 305 engages with a lock receiving portion provided on the battery mounting portion 4 to fix (lock) the battery 300 to the battery mounting portion 4 . The unlock button (not shown) is pressed by the user to unlock the lock member 305 and the lock receiver.

As shown in FIGS. 2 and 5, the battery mounting portion 4 is provided in the second portion 13 of the main body housing 11. As shown in FIGS. The battery mounting part 4 is provided on the inner side of the upper wall 131 and the side wall 133, and is formed to be able to receive the battery 300 from the front. As described above, the portion of the main body housing 11 located above the belt drive unit 6 is formed in a stepped shape in which the upper wall 131 of the second portion 13 is located below the upper wall 121 of the first portion 12. has been done. Since the first portion 12 accommodates the motor 2, it can be said that the battery mounting section 4 is provided in front of the motor 2 and above the belt drive section 6. It can also be said that the battery mounting section 4 overlaps the belt drive section 6 when viewed from above, and overlaps the motor 2 when viewed from the front.

As shown in FIG. 6, the battery mounting section 4 is configured such that the battery 300 does not protrude upward from the upper wall 121 of the housing 10 in the vertical direction when the battery 300 is mounted in the mounted state (hereinafter referred to as the battery mounted state). has been done. Further, the battery mounting section 4 is configured such that the battery 300 does not protrude forward from the front end of the main body housing 11 in the front-rear direction when the battery is mounted. In this embodiment, as shown in FIG. 6, the surface (top surface 312) of the battery 300 on the opposite side to the mounting surface 321 in the vertical direction is approximately connected to the top wall 121 of the first portion 12 of the main body housing 11. in the same position. Further, in the front-back direction, the front surface 314 of the battery 300 is located at approximately the same position as the front end of the main body housing 11. Furthermore, as shown in FIG. 4, the battery mounting portion 4 is configured such that the battery 300 does not protrude to the left from the left end of the left main body housing 11L and does not protrude to the right from the right main body housing 11R in the left-right direction. ing. In other words, the battery mounting portion 4 is configured such that the left-right direction of the battery 300 falls within the width of the second portion 13 of the main body housing 11 in the left-right direction when the battery is mounted. In this embodiment, in the left-right direction, the right surface 313 of the battery 300 is located at approximately the same position as the side walls 123 and 133 of the right main housing 11R.

The battery mounting section 4 includes a mounting surface 41, a pair of guide rails 42, a pair of power terminals 44, and a signal terminal 46. In this embodiment, the sliding direction of the battery 300 with respect to the battery mounting portion 4 is the front-back direction. Specifically, the mounting direction of the battery 300 on the battery mounting section 4 is from the front to the rear. The direction in which the battery 300 attached to the battery attachment part 4 is removed is from the back to the front.

The mounting surface 41 is a surface that faces one surface (mounting surface 321) of the battery 300 when the battery 300 is mounted on the battery mounting section 4. The mounting surface 41 is approximately parallel to the front-rear direction and the left-right direction. Guide rails 42 extending in the front-rear direction are provided inside the side walls 133 of the second portion 13, respectively. The pair of guide rails 42 are configured to engage the rail receiving portions 322 of the battery 300. When mounting the mounting section 320 of the battery 300 on the battery mounting section 4, the guide rail 42 guides the rail receiving section 322 in the front-rear direction. It can be said that the mounting surface 41 is substantially parallel to the sliding direction of the battery 300.

The pair of power terminals 44 are provided between the pair of guide rails 42. The pair of power terminals 44 are formed in a plate shape that protrudes upward from the mounting surface 41 and extends in the front-rear direction. The pair of power terminals 44 are configured to receive power from the battery 300 attached to the battery attachment section 4 . The signal terminal 46 is provided between the pair of power supply terminals 44, projects upward from the mounting surface 41, and extends in the front-rear direction. The signal terminal 46 is configured to transmit and receive signals to and from the battery 300 mounted on the battery mounting section 4 .

By sliding the mounting part 320 of the battery 300 from the front to the back with respect to the battery mounting part 4, the rail receiving part 322 of the battery 300 engages with the guide rail 42 of the battery mounting part 4, and the battery 300 It is attached to the battery attachment part 4. At this time, the mounting surface 41 of the battery mounting section 4 faces the mounting surface 321 of the battery 300. Further, each of the pair of power terminals 44 of the battery mounting portion 4 is electrically connected to each of the pair of power terminals 324 of the battery 300. Further, the signal terminal 46 of the battery mounting portion 4 is electrically connected to the signal terminal 326 of the battery 300.

The battery mounting portion 4 further includes a lock receiving hole 47 into which the locking member 305 of the battery 300 engages. When the battery 300 is attached to the battery attachment part 4, the locking member 305 engages with the lock receiving hole 47, and the battery 300 is fixed so as not to be movable in the front-back direction. Then, when the unlock button of the battery 300 is pressed, the engagement between the lock member 305 and the lock receiving hole 47 is released. In the state in which the engagement is released, the battery 300 is removed from the battery mounting section 4 by sliding the battery 300 from the rear to the front with respect to the battery mounting section 4 .

The belt sander 1 of this embodiment further includes a front handle 17. The front handle 17 is connected to the housing 10 and is rotatable relative to the housing 10. As shown in FIG. 3, the rotation axis A4 of the front handle 17 extends in the left-right direction. The front handle 17 is also referred to as a "second handle."

The front handle 17 rotates around a rotation axis A4 extending in the left-right direction. The front handle 17 includes an arm 171 having a base end 172 and a distal end 173 and extending in a direction intersecting the rotation axis A4, and a grip part 175 for being gripped by a user.

As shown in FIGS. 2 and 3, the base end portion 172 of the arm 171 is detachably attached to the rotating portion 18 provided on the left side wall of the housing 10 (fan housing 161). The rotating portion 18 is configured to engage with the base end portion 172 of the arm 171 and allow the arm 171 to rotate within a predetermined range around the rotation axis A4. The grip portion 175 extends from the tip portion 173 of the arm 171 to the right side. The grip portion 175 is parallel to the left-right direction. The tip (right end) of the grip portion 175 is located to the left of the right end (right side walls 123, 133) of the housing 10. The length of the grip portion 175 in the left-right direction is formed to fit within the width of the housing 10 in the left-right direction. The front handle 17 adjusts the length of the arm 171 and the base end 172 of the arm 171 relative to the housing 10 so that the grip portion 175 does not come into contact with the housing 10 or the battery 300 attached to the battery attachment portion 4 due to rotation. The position of has been adjusted.

A plurality of cam surfaces extending in the radial direction are provided on the rotating portion 18 and the portion of the front handle 17 that faces the rotating portion 18 (the right side of the base end 172 of the gripping portion 175). It is being The front handle 17 is configured to be positioned at a plurality of rotational positions when the plurality of cam surfaces of the front handle 17 and the cam surface of the rotation portion 18 mesh (engage) with each other. In this embodiment, the front handle 17 is positioned at four rotational positions (angular positions). As shown in FIG. 3, as the arm 171 rotates around the rotation axis A4, the front handle 17 (grip portion 175) moves from below to above in the order of positions R1, R2, R3, and R4. The position of the gripping portion 175 is fixed (positioned) at each rotational position R1 to R4 by engagement between the base end 172 of the arm 171 and the rotational portion 18.

At position R1, the grip portion 175 is located in front of the front end of the housing 10 (second portion 13) and below the mounting surface 41. At position R2, the grip portion 175 is located in front of the front end of the housing 10 and in front of (directly in front of) the battery 300 attached to the battery attachment portion 4. In the present embodiment, at position R2, as shown in FIG. It is located at approximately the same position in the vertical direction as the upper surface 312 of. At position R2, plane P2 including upper wall 121 passes through the upper end of grip portion 175 and upper surface 312 of battery 300. Position R2 is also referred to as a "first rotation position."

At positions R3 and R4, the grip portion 175 is located on the rear side of the front end of the housing 10 and above the upper wall 121 of the housing 10 in the vertical direction. Position R3 is a position suitable for the user to perform processing work in the first usage mode by gripping the handle 14 with one hand and gripping part 175 of the front handle 17 with the other hand. . Position R4 is a suitable position for the user to lift and move the belt sander 1. Note that at position R1, the gripping part 175 is located below the mounting surface 41, and at positions R3 and R4, the gripping part 175 is located below the upper end of the housing 10 (the upper wall 121 of the first portion 12). It is located on the upper side, that is, above the battery 300 attached to the battery attachment part 4. Therefore, the user can attach and detach the battery 300 to and from the battery mounting section 4 by rotating the front handle 17 and moving the grip section 175 to any of the positions R1, R3, and R4. Positions R1, R3, and R4 are also referred to as "second rotation positions."

Hereinafter, the effects produced by the belt sander 1 including the battery mounting part 4 of this embodiment will be explained. The battery mounting section 4 of this embodiment is located at a position where it overlaps with the belt drive section 6 (sanding belt B, sanding surface B1) when viewed from above, and overlaps with the motor 2 when viewed from the front. located at the location. Therefore, when the belt sander 1 is driven, the weight of the motor 2 and the battery 300 attached to the battery attachment part 4 is applied to the sanding surface B1. Therefore, the machining work can be performed using the mass of the motor 2 and the battery 300, so that the operational efficiency of the belt sander 1 can be improved.

Further, the battery mounting section 4 is configured such that the top surface 312 of the battery 300 is at approximately the same position as the top wall 121 of the first portion 12 of the main body housing 11 in the vertical direction when the battery is mounted. In addition, in the left-right direction, the right surface 313 of the battery 300 is configured to be at approximately the same position as the side walls 123, 133 of the right main housing 11R. Furthermore, in the front-rear direction, the front surface 314 of the battery 300 is configured to be at approximately the same position as the front end of the main body housing 11. Therefore, the belt sander 1 with the battery installed can be made more compact in the vertical, horizontal, and front-rear directions, and the processing range of the belt sander is reduced because the battery 300 comes into contact with walls or objects located in front of the belt sander 1 or on the left and right sides. Being restricted can be suppressed.

Furthermore, when the battery is attached, the top surface 312 of the battery 300 is at approximately the same position in the vertical direction as the top wall 121 of the housing 10, so the belt sander 1 is turned over with the sanding surface B1 facing vertically upward, and the user When the belt sander 1 is used in a manner in which the material to be processed is gripped and pressed against the sanding belt B for machining work (second use manner), the upper wall 121 of the housing 10 and the upper surface 312 of the battery 300 are Contact with desk etc. Therefore, the posture of the belt sander 1 in the second usage mode can be stabilized. Furthermore, since the top surface 312 of the battery 300 has the largest area of the battery 300, a relatively large area comes into contact with a desk or the like. Therefore, the posture of the belt sander 1 in the second usage mode can be more stabilized.

Further, in the belt sander 1, the direction in which the battery 300 is attached to the battery attachment part 4 is from the front to the rear, and is along the direction in which the handle 14 extends. Therefore, when the user attaches the battery to the battery attachment part 4, for example, the user tends to apply force in the direction opposite to the attachment direction of the battery 300 (from the back to the front) with the hand gripping the handle 14. Therefore, according to the belt sander 1 of this embodiment, there is an advantage that the battery 300 can be easily attached to the battery attachment part 4.

The belt sander 1 also includes a front handle 17 that is rotatable with respect to the housing 10. By rotating the front handle 17, the grip part 175 is moved between position R1 (second rotational position), which is located below the battery 300 mounted on the battery mounting part 4 in the vertical direction, and the grip part 175. Position R2 (first rotation position) where the upper end of the housing 175 is at approximately the same position as the upper wall 121 of the housing 10; and a position where the grip portion 175 is located above the battery 300 attached to the battery attachment portion 4. It moves to R3 and R4 (second rotation position). Therefore, when the front handle 17 is rotated so that the grip part 175 moves to position R2 and the belt sander 1 is used in the second usage mode, the upper wall 121 of the housing 10, the grip part 175, and the battery The upper surface 312 of the battery 300 attached to the attachment part 4 comes into contact with a desk or the like on which the belt sander 1 is placed. Therefore, the posture of the belt sander 1 in the second usage mode can be further stabilized. Moreover, the battery 300 can be attached to and detached from the battery mounting part 4 by rotating the front handle 17 so that the grip part 175 moves to any one of positions R1, R3, and R4.

Furthermore, in view of the spirit of the present disclosure and the above-described embodiments, the following aspects are constructed. At least one of the following aspects may be employed in combination with at least one of the configurations (features) described in the above-described embodiments, modifications thereof, and each claim.

[Aspect 1-1]
It is a belt sander,
electric motor and
a housing having a motor housing portion in which the motor is housed;
A belt drive unit including a drive roller rotated by the motor and a driven roller, and configured to drive an endless sanding belt stretched between the drive roller and the driven roller,
The direction in which the rotation axis of the drive roller and the rotation axis of the driven roller extend is the left-right direction, the direction in which the driven roller and the drive roller are lined up is the front-rear direction, and the left-right direction and the direction perpendicular to the front-rear direction is the up-down direction. a belt drive unit, wherein the belt drive unit is provided below the motor, and a polishing surface is defined by a lower surface of the sanding belt;
a first handle that is provided on the rear side of the motor, which is one side in the front-rear direction, extends in the front-rear direction, and is gripped by a user;
a battery mounting part to which the battery, which serves as a power source for the motor, can be attached and detached by being slid in a sliding direction;
The battery mounting portion is provided at a position overlapping the polishing surface when viewed from above, and at a position overlapping the motor when viewed from the front,
In the belt sander, the sliding direction is a horizontal direction including the front-rear direction and the left-right direction.
[Aspect 1-2]
The motor accommodating portion includes an upper wall substantially parallel to the polishing surface,
The battery mounting portion is provided below the upper wall in the vertical direction.
[Aspect 1-3]
The battery mounting portion is configured such that the battery does not protrude upward from the upper wall in the vertical direction when the battery is mounted on the battery mounting portion.
[Aspect 1-4]
The battery mounting portion is configured such that, in the mounted state in which the battery is mounted on the battery mounting portion, the battery protrudes above the upper wall by a predetermined protruding length in the vertical direction. ,
The predetermined protrusion length is 10% or less of the length of the battery in the vertical direction.
[Aspect 1-5]
The battery mounting portion is configured such that the battery does not protrude from the front end of the housing in the front-rear direction when the battery is mounted on the battery mounting portion.
[Aspect 1-6]
The battery mounting portion is configured such that, in the mounted state in which the battery is mounted on the battery mounting portion, the battery protrudes forward by a predetermined protrusion length beyond a front end of the housing in the front-rear direction. Ori,
The predetermined protrusion length is 10% or less of the length of the battery in the front-rear direction.
[Aspect 1-7]
The battery mounting portion is configured such that the battery does not protrude from the left and right ends of the housing in the left-right direction when the battery is mounted on the battery mounting portion.
[Aspect 1-8]
The battery mounting portion is configured such that when the battery is mounted on the battery mounting portion, the battery protrudes by a predetermined protruding length to the left or right side of the left end or right end of the housing in the left-right direction. It is configured as follows.
The predetermined protrusion length is 10% or less of the length of the battery in the left-right direction.
[Aspect 1-9]
The sliding direction is the front-back direction,
The battery mounting portion is configured such that the battery can be mounted by sliding the battery from the front to the rear with respect to the battery mounting portion.
[Aspect 1-10]
The battery mounting portion is configured to allow the battery to be attached or detached by sliding the battery in the left-right direction.
[Aspect 1-11]
A second arm having a rotation shaft extending in the left-right direction and connected to the housing, and a grip part connected to the arm and gripped by a user, the second arm being rotatable with respect to the housing. Equipped with a handle
In response to rotation of the second handle, the grip portion
a first rotational position in which the upper end of the gripping portion is located at approximately the same position as the upper wall of the motor accommodating portion in the vertical direction;
In the mounted state in which the battery is mounted on the battery mounting section, the grip section moves to a second rotational position located below or above the battery in the vertical direction.
[Aspect 1-12]
It is a belt sander,
electric motor and
a housing having a motor housing portion in which the motor is housed;
A belt drive unit including a drive roller rotated by the motor and a driven roller, and configured to drive an endless sanding belt stretched between the drive roller and the driven roller,
The direction in which the rotation axis of the drive roller and the rotation axis of the driven roller extend is the left-right direction, the direction in which the driven roller and the drive roller are lined up is the front-rear direction, and the left-right direction and the direction perpendicular to the front-rear direction is the up-down direction. a belt drive unit, wherein the belt drive unit is provided below the motor, and a polishing surface is defined by a lower surface of the sanding belt;
a first handle that is provided on the rear side of the motor, which is one side in the front-rear direction, extends in the front-rear direction, and is gripped by a user;
A second arm having a rotation shaft extending in the left-right direction and connected to the housing, and a grip part connected to the arm and gripped by a user, the second arm being rotatable with respect to the housing. handle and
a battery mounting part to which the battery, which serves as a power source for the motor, can be attached and detached by being slid in a sliding direction;
The battery mounting part is
provided at a position overlapping the polishing surface when viewed from above and at a position overlapping the motor when viewed from the front;
The battery mounting portion is configured such that the battery does not protrude from the upper wall of the motor accommodating portion in the vertical direction when the battery is mounted on the battery mounting portion;
In response to rotation of the second handle, the grip portion
a first rotational position in which the upper end of the gripping portion is located at approximately the same position as the upper wall in the vertical direction;
The belt sander moves to a second rotating position in which the grip part is located below or above the battery in the vertical direction in a mounted state in which the battery is mounted on the battery mounting part.
[Aspect 1-13]
The battery mounting portion is configured such that when the battery is mounted on the battery mounting portion, the top surface of the battery is at approximately the same position as the top wall in the vertical direction.
[Aspect 1-14]
It is a belt sander,
electric motor and
a housing having a motor housing portion in which the motor is housed;
A belt drive unit including a drive roller rotated by the motor and a driven roller, and configured to drive an endless sanding belt stretched between the drive roller and the driven roller,
The direction in which the rotation axis of the drive roller and the rotation axis of the driven roller extend is the left-right direction, the direction in which the driven roller and the drive roller are lined up is the front-rear direction, and the left-right direction and the direction perpendicular to the front-rear direction is the up-down direction. a belt drive unit, wherein the belt drive unit is provided below the motor, and a polishing surface is defined by a lower surface of the sanding belt;
a first handle that is provided on the rear side of the motor, which is one side in the front-rear direction, extends in the front-rear direction, and is gripped by a user;
a battery mounting part to which the battery, which serves as a power source for the motor, can be attached and detached by being slid in a sliding direction;
The battery mounting part is provided on the upper wall of the motor accommodating part so as to overlap the motor and the polishing surface when viewed from above,
The battery mounting portion is configured such that the battery can be mounted by sliding the battery from the rear to the front with respect to the battery mounting portion.
Belt sander.
[Aspect 1-15]
A belt sander to which the battery is removably attached.
[Aspect 2-1]
It is a belt sander,
electric motor and
a housing that accommodates the motor;
A belt drive unit including a drive roller rotated by the motor and a driven roller, and configured to drive an endless sanding belt stretched between the drive roller and the driven roller,
The direction in which the rotation axis of the drive roller and the rotation axis of the driven roller extend is the left-right direction, the direction in which the driven roller and the drive roller are lined up is the front-rear direction, and the left-right direction and the direction perpendicular to the front-rear direction is the up-down direction. a belt drive unit, wherein the belt drive unit is provided below the motor, and a polishing surface is defined by a lower surface of the sanding belt;
A first switch disposed in the housing, configured to be manually operable by a user, and having a first on position where the first switch is turned on and a first off position where the first switch is turned off. a first switch comprising a first switch operating portion movable to the first switch;
A second switch disposed in the housing, configured to be manually operable by a user, and having a second on position where the second switch is turned on and a second off position where the second switch is turned off. a second switch, comprising a second switch operating portion movable to the second switch;
The first switch and the second switch are momentary switches,
The motor is configured to be driven when the first switch and the second switch are in an on state, and to be stopped when at least one of the first switch and the second switch is in an off state. , furthermore,
a first lock switch disposed in the housing and configured to maintain the first switch operating portion in the first on position;
a second lock switch disposed in the housing and configured to maintain the second switch operating portion in the second on position.
[Aspect 2-2]
The housing includes a motor accommodating part that accommodates the motor, and a grip part connected to the motor accommodating part and extending rearward from the motor accommodating part,
The second switch operation section is
The grip is provided in the grip and has a shape that protrudes upward from the grip when in the second off position;
It is configured to move from the second OFF position to the second ON position by pressing the grip part.
[Aspect 2-3]
The second lock switch is provided in the housing so as to move in a direction intersecting the direction of movement of the second switch operating section.
[Aspect 2-4]
The first lock switch and the second lock switch are provided on the same side of the housing.
[Aspect 2-5]
The second lock switch is provided below the first lock switch.
[Aspect 2-6]
The first lock switch is
a lock-off position that engages with the first switch operating portion in the first off position to restrict movement of the first switch operating portion to the first on position;
and a lock-on position that engages with the first switch operating section in the first on position to restrict movement of the first switch operating section to the first off position. ing.
[Aspect 2-7]
The first switch includes a first biasing member that biases the first switch operating portion that has been moved to the first on position to return to the first off position,
The second switch includes a second biasing member that biases the second switch operating portion that has been moved to the first on position to return to the second off position.
[Aspect 2-8]
The grip portion extends rearward and downward from the motor housing portion,
The first switch operation section includes:
provided in the grip between the second switch and the motor accommodating part, and having a shape that protrudes downward from the grip when in the first off position;
The grip is configured to move from the first off position to the first on position by pulling the grip.
[Aspect 2-9]
The upper wall of the motor accommodating part is substantially parallel to the polishing surface,
The second switch operation section is provided below a virtual plane including the upper wall.

1: belt sander, 10: housing, 11: main body housing, 11L: left main body housing, 11R: right main body housing, 12: first part, 121: upper wall, 122: front wall, 123: side wall, 124: rear wall , 13: Second part, 131: Top wall, 133: Side wall, 14: Handle, 14L: Left wall, 14R: Right wall, 142: Support wall, 144: Opening, 145L: Opening, 145R: Opening, 146: Hollow part, 146a: first flange, 146b: second flange, 147: opening, 149: opening, 149L: protrusion, 149R: protrusion, 15: controller housing, 16: horizontal housing, 161: fan housing, 162: Gear cover, 163: Belt cover, 165: Air outlet, 140: Discharge nozzle, 150: Suction nozzle, 17: Front handle, 171: Arm, 172: Base end, 173: Tip, 175: Grip, A4: Rotating shaft, 18: Rotating part, 19: Dust collection port, 2: Motor, 21: Motor body, 22: Shaft, A3: Rotating shaft, 3: Fan, 31: Guide plate, 32: Baffle plate, 4: Battery mounting section, 41: Mounting surface, 42: Guide rail, 44: Power terminal, 46: Signal terminal, 47: Lock receiving hole, 5: Controller, 6: Belt drive section, 61: Drive roller, 62: Followed roller , A1, A2: Rotating shaft, 64: Support frame, 8: Switch mechanism, 80: First switch, 81: First switch operation part, 811: Base, 812: Contact part, 814: Boss part, 815: Projection part, 818: biasing member, 82: first main switch, 821: main body, 822: plunger, 85: first lock switch, 851: operating shaft section, 851L, 851R: operating section, 853: lock-off locking part, 854: hollow part, 854L, 854R: regulation wall, 855L, 855R: lock-on retaining part, 858: biasing member, 859: holding part, 90: second switch, 91: second switch operation part, 911 : Base, 911L: Left wall, 912: Contact part, 915: Shaft hole, 916: Rotating shaft, 917: Opening, 918: Torsion spring, 918f: Arm, 92: Second main switch, 921: Main body , 922: actuator, 95: second lock switch, 951: operation section, 952: collar section, 953: stepped pin, 954: locking section, 958: biasing member, 35: power transmission section, 39: dial, 101: partition, 102: wall, 191: first channel, 192: second channel, 200: dust box, 210: first nozzle, 212: O-ring, 220: second nozzle, 222: O-ring, 230 : Container part, 231: Top surface, 232: Rear wall, 233: Side surface, 234: Bottom surface, 235: Window part, 240: Nozzle connection part, 240L: Left nozzle part, 240R: Right nozzle part, 241: Partition wall, 242: Groove portion, 243: Rear end portion, 244: O-ring, 245: Engaging portion, 246: Nut, 247: Plate, 250: Main body portion, 253: Front end portion, 258: Cylindrical portion, 260: Filtering member, 261: Opening, 262: Frame, 265: Ground member, 270: Detachable part, 271: Mounting screw, 272: Knob, 273: Shaft, 274: Front end, 281: First space, 282: Second space, 300: Battery, 305: Lock member, 310: Case, 311: Projection, 312: Top surface, 313: Side surface, 314: Front surface, 320: Mounting section, 321: Mounting surface, 322: Rail receiving section, 324: Power terminal, 326: Signal terminal, B: Sanding belt, B1: Sanding surface, F1, F2: Air flow, P1, P2: Virtual plane, R1, R2, R3, R4: Rotation position

Claims (13)

A dust box that is detachable from a belt sander and includes a belt drive unit configured to rotate an endless sanding belt, and a housing that accommodates a dust collection fan and an electric motor that drives the belt drive unit. The housing has an exhaust nozzle that discharges dust generated by processing operations from inside the housing by rotation of the dust collection fan, and a suction nozzle that sucks air from the dust box into the housing.
The dust box is
a first nozzle connectable to the discharge nozzle;
a second nozzle connectable to the suction nozzle;
a synthetic resin container connected to the first nozzle and the second nozzle;
A filtration member that separates air and dust, the filter member being provided within the container section, and connecting the space within the container section into a first space communicating with the first nozzle and a second space communicating with the second nozzle. a filtration member that divides the
dust box. The dust box according to claim 1,
The filtering member is a dust box provided within the container portion at a position closer to the second nozzle than the first nozzle. The dust box according to claim 1 or claim 2,
The belt drive unit includes a drive roller rotated by the motor and a driven roller, and the direction in which the rotation axis of the drive roller and the rotation axis of the driven roller extend is the left and right direction, and the driven roller and the drive When the direction in which the rollers are lined up is defined as the front-back direction, and the direction orthogonal to the left-right direction and the front-back direction is defined as the up-down direction, the polishing surface is defined by the lower surface of the sanding belt,
The dust box is
When attached to the belt sander, the first nozzle is located below the second nozzle,
The first space is a dust box that is a lower space within the container section. The dust box according to any one of claims 1 to 3,
The first nozzle and the second nozzle are opened in the same direction. The dust box according to any one of claims 1 to 4,
The filtering member is a dust box that is a bag-shaped air filter with one end open. The dust box according to any one of claims 1 to 5,
The container part includes a nozzle connection part connected to the first nozzle and the second nozzle, and a main body part detachably attached to the nozzle connection part,
The filtering member is a dust box provided at the nozzle connection section. The dust box according to claim 6, further comprising:
A dust box, comprising a detachable section for attaching and detaching the container main body to the nozzle connecting section. The dust box according to any one of claims 1 to 7,
At least a portion of the dust box is formed of a conductive synthetic resin. The dust box according to claim 8,
In the belt sander, when the vertical direction is defined with the side where the belt drive unit is provided as the lower side and the opposite side as the upper side,
In a state where the dust box is attached to the belt sander, at least a portion of the container portion below the intermediate position in the vertical direction is formed of the conductive synthetic resin. The dust box according to claim 8 or 9, further comprising:
A dust box comprising a grounding member, one end of which is connected to the portion formed of the conductive synthetic resin, and the other end of which is exposed to the outside of the dust box. A belt sander, on which the dust box according to any one of claims 1 to 10 is removably attached. The belt sander according to claim 11,
electric motor and
dust collection fan,
a housing that accommodates the motor and the dust collection fan;
a belt drive section configured to include a drive roller rotated by the motor and a driven roller, and configured to drive an endless sanding belt stretched between the drive roller and the driven roller,
The direction in which the rotation axis of the drive roller and the rotation axis of the driven roller extend is the left-right direction, the direction in which the driven roller and the drive roller are lined up is the front-rear direction, and the left-right direction and the direction perpendicular to the front-rear direction is the up-down direction. In the case where the belt drive section is disposed below the housing,
The housing includes:
an exhaust nozzle that discharges dust generated by the processing operation from inside the housing; a suction nozzle that sucks air from the dust box into the housing;
a dust collection port provided at the rear of the belt drive unit;
an air outlet communicating with a space in which the dust collection fan is housed;
a first flow path connecting the dust collection port and the discharge nozzle;
a second flow path connecting the suction nozzle and the air outlet;
The first flow path is provided to be separated from a space in the housing in which the motor and the dust collection fan are accommodated, and the second flow path,
The second flow path communicates with a space in which the dust collection fan is accommodated,
The dust collection fan rotates to generate an airflow from the dust collection port through the first flow path toward the discharge nozzle, and an airflow from the suction nozzle through the second flow path toward the air discharge port. A belt sander that generates. The belt sander according to claim 12,
The suction nozzle and the discharge nozzle open rearward,
The discharge nozzle is a belt sander provided below the suction nozzle.

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