WO2020194672A1

WO2020194672A1 - Circular saw and dust collection box for circular saw

Info

Publication number: WO2020194672A1
Application number: PCT/JP2019/013638
Authority: WO
Inventors: 勝成藤井
Original assignee: 京セラ株式会社
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-10-01

Abstract

This circular saw is provided with a circular saw blade, a motor, a space-forming member, a grip part, and an antenna. The circular saw blade has a first main surface and a second main surface facing each other. The motor causes the circular saw blade to rotate. The space-forming member is located above the circular saw blade and creates a space through which sawdust from a workpiece being cut by the circular saw passes. The grip part is located on the first main surface side with respect to the circular saw blade and the space-forming member. The antenna is located at the space-forming member.

Description

Dust collection box for circular saws and circular saws

This disclosure relates to circular saws and dust collection boxes for circular saws.

Various technologies have been proposed for circular saws. For example, Patent Document 1 discloses a circular saw having a communication unit.

JP-A-2018-69431

In a circular saw having a communication unit, it is desired to improve the reliability of communication.

Therefore, the present disclosure has been made in view of the above points, and an object of the present disclosure is to provide a circular saw and a dust collecting box for a circular saw, which can improve the reliability of communication.

Disclosure of circular saws and dust collection boxes for circular saws. In one embodiment, the circular saw comprises a circular saw blade, a motor, a space forming member, a grip, and an antenna. The circular saw blade has first and second main surfaces facing each other. The motor rotates the circular saw blade. The space forming member is located above the circular saw blade and forms a space through which chips of the work object cut by the circular saw blade pass. The grip portion is located on the first main surface side with respect to the circular saw blade and the space forming member. The antenna is located on the space forming member.

In one embodiment, the dust collection box is detachably attached to a circular saw that includes a circular saw blade that cuts the object to be machined. The dust collecting box includes a dust collecting box housing and an antenna. The dust collection box housing is located above the peripheral edge of the circular saw blade when mounted on the circular saw, and opens to the circular saw blade side to provide an internal space for collecting chips from the workpiece. Form. The antenna is located in the dust collection box housing.

The reliability of communication can be improved.

It is a side view which shows an example of the appearance of a circular saw. It is a side view which shows an example of the appearance of a circular saw. It is a top view which shows an example of the appearance of a circular saw. It is a figure which shows an example of the cross-sectional structure of a circular saw. It is a figure which shows an example of the cross-sectional structure of a circular saw. It is a figure which shows an example of the cross-sectional structure of a circular saw schematically. It is a figure which shows an example of the electric structure of a circular saw. It is a perspective view which shows an example of the appearance of a communication board. It is a perspective view which shows an example of the appearance of a circular saw. It is a top view which shows an example of the appearance of a circular saw. It is a side view which shows an example of the appearance of a circular saw. It is a figure which shows an example of the cross-sectional structure of a circular saw schematically. It is a perspective view which shows an example of the appearance of the circular saw which removed the dust collection box. It is a perspective view which shows an example of the appearance of a circular saw. It is a side view which shows an example of the appearance of a circular saw. It is a perspective view which shows an example of the appearance of the circular saw which removed the dust collection box.

FIGS. 1 to 3 are views showing an example of the appearance of the circular saw 1. 1 and 2 are side views, and FIG. 3 is a top view. FIG. 4 is a diagram showing a cross-sectional structure of the circular saw 1 in the arrow AA shown in FIG. FIG. 5 is a diagram showing a cross-sectional structure of the circular saw 1 in the arrow view BB shown in FIG.

The circular saw 1 is, for example, a rechargeable circular saw, and includes a surface plate 2, a battery 3, and a main body 4 having a disk-shaped circular saw blade 5. The battery 3 is removable from the main body 4. The battery 3 is also called a battery pack. FIG. 2 shows a circular saw 1 in a state where the battery 3 is not attached to the main body 4. The circular saw 1 can cut an object to be machined by the main body 4 rotating the circular saw blade 5.

The main body 4 includes a circular saw blade 5, a safety cover 6, a housing 7 for accommodating a motor 10 and the like for rotating the circular saw blade 5, and an operation button 41. The safety cover 6 covers the lower side of the peripheral edge of the circular saw blade 5 when the circular saw 1 does not cut the object to be machined. The safety cover 6 is movable along the peripheral edge of the circular saw blade 5. When the circular saw 1 cuts the object to be machined, the safety cover 6 is pushed backward by the object to be machined and moves into the upper cover 70 covering the upper side of the peripheral edge of the circular saw blade 5.

In addition to the upper cover 70, the housing 7 includes a grip portion 71 that is gripped by the user, and a storage portion 72 that stores the motor 10 and a plurality of gears and the like. The storage unit 72 includes a battery mounting unit 73 (see FIG. 5) in which the battery 3 is mounted.

The grip portion 71 has an arch shape and protrudes above the storage portion 72. The operation button 41 is exposed from the grip portion 71. A power switch 40 (see FIG. 7 described later) is housed in the grip portion 71. The power switch 40 is turned on when the operation button 41 is pressed. On the other hand, the power switch 40 is turned off when the operation button 41 is not pressed. The motor 10 rotates when the power switch 40 is on, and does not rotate when the power switch 40 is off. As a result, when the operation button 41 is pressed, the circular saw 1 rotates the circular saw blade 5. On the other hand, when the operation button 41 is changed from the pressed state to the non-pressed state, the circular saw 1 stops the rotation of the circular saw blade 5.

The storage unit 72 includes a first storage unit 721 that stores the motor 10, a second storage unit 722 that stores a plurality of gears (see FIGS. 3 to 5), and a third storage unit 723 that stores the control board 20 (FIG. 3). 3 and 4). Hereinafter, the term "right side" means the right side when the circular saw 1 is viewed from the front, and the term "left side" means the left side when the circular saw 1 is viewed from the front.

As shown in FIG. 3, the grip portion 71 extends in the front-rear direction in the top view. The grip portion 71 is located on the right side of the upper cover 70. As shown in FIGS. 1, 2 and 5, the storage portion 72 is located below the grip portion 71. That is, the first storage portion 721, the second storage portion 722, and the third storage portion 723 are located below the grip portion 71. Further, as shown in FIG. 5, the battery mounting portion 73 is located below the grip portion 71.

The first storage section 721 and the third storage section 723 are located on the right side of the grip section 71. The second storage portion 722 exists from directly below the grip portion 71 to the upper cover 70. The third storage unit 723 and the battery mounting unit 73 are located behind the first storage unit 721. The battery mounting portion 73 is located above the battery 3 mounted therein. The third storage unit 723 is located on the right side of the battery mounting unit 73.

The motor 10 in the first storage unit 721 is, for example, a brassless motor. The motor 10 includes a motor body 11 and a motor shaft 12. The motor shaft 12 is also called a rotating shaft. The motor body 11 has a rotor and a stator. The motor body 11 is housed in the first storage unit 721. The motor shaft 12 extends along the left-right direction. In other words, the motor shaft 12 extends along a direction perpendicular to the main surface 50 (see FIGS. 1, 2 and 5) of the circular saw blade 5. In other words, the motor shaft 12 is parallel to the direction perpendicular to the main surface 50 of the circular saw blade 5. The motor shaft 12 extends from the first storage portion 721 to the second storage portion 722, and one end of the motor shaft 12 is connected to a gear in the second storage portion 722. The plurality of gears in the second housing portion 722 reduce the rotation speed and transmit the rotation of the motor 10 to the circular saw blade 5. The motor 10 can rotate the circular saw blade 5 via the plurality of gears.

The control board 20 in the third storage unit 723 can control the rotation of the motor shaft 12 of the motor 10. It can be said that the control board 20 can control the rotation of the circular saw blade 5. As shown in FIGS. 4 and 5, the control board 20 is located in the third storage unit 723 so as to be perpendicular to the left-right direction. In other words, the control board 20 is located in the third accommodating portion 723 so that the direction perpendicular to the control board 20 is parallel to the motor shaft 12. That is, the direction perpendicular to the main surface 200 of the control board 20 is parallel to the motor shaft 12.

In this example, a mechanism for lifting the rear of the main body 4 with the front as a fulcrum to change the amount of protrusion of the circular saw blade 5 from the lower surface 2a of the surface plate 2 is provided on the surface plate 2. The user can change the amount of protrusion of the circular saw blade 5 from the lower surface 2a of the surface plate 2 by operating this mechanism. As a result, the user can adjust the depth of cut of the circular saw blade 5 with respect to the object to be machined. Further, a mechanism for inclining the posture of the main body 4 in the left-right direction to change the angle of the circular saw blade 5 with respect to the lower surface 2a of the surface plate 2 is provided on the surface plate 2. By operating this mechanism, the user can change the angle of the circular saw blade 5 with respect to the lower surface 2a of the surface plate 2. As a result, the user can use, for example, a circular saw 1 to cut the object to be machined so that the cut surface is inclined.

Next, the upper cover 70 of the circular saw 1 will be described in more detail. FIG. 6 is a diagram schematically showing an example of the cross-sectional structure of the circular saw 1. The upper cover 70 includes a blade guard 701 and a discharge pipe 702. The blade guard 701 covers the upper side of the peripheral edge of the circular saw blade 5 from the front side to the rear side thereof. The cross section of the blade guard 701 viewed along the front-rear direction may have, for example, a substantially U-shaped shape that opens toward the circular saw blade 5. The upper peripheral edge of the circular saw blade 5 is located inside the blade guard 701 and is covered by the blade guard 701.

An opening 701a is formed in the blade guard 701. The opening 701a penetrates the blade guard 701 along its thickness direction. A discharge pipe 702 is connected to the peripheral edge of the opening 701a of the blade guard 701 and protrudes from the blade guard 701. That is, the discharge pipe 702 protrudes from the blade guard 701. The discharge pipe 702 has a cylindrical shape (for example, a cylindrical shape), surrounds the opening 701a of the blade guard 701, and is connected to the blade guard 701. That is, the opening on the base end side of the discharge pipe 702 (hereinafter, referred to as the base end port 702b) is connected to the space H1 between the blade guard 701 and the circular saw blade 5 via the opening 701a of the blade guard 701. The opening on the tip end side of the discharge pipe 702 (hereinafter, referred to as a discharge port 702a) opens in the space outside the circular saw 1. Therefore, the space H1 between the blade guard 701 and the circular saw blade 5 is connected to the external space via the internal space H2 of the discharge pipe 702.

The blade portion formed on the peripheral edge of the circular saw blade 5 acts on the object to be processed (for example, wood) 100 mainly on the front side to cut the object 100 to be processed. At this time, chips (for example, wood chips) 101 generated from the object to be processed 100 are scattered upward. In other words, the blade portion of the circular saw blade 5 is cut from the lower side to the upper side with respect to the workpiece 100. In the example of FIG. 6, the rotation direction D1 of the circular saw blade 5 is schematically indicated by an arrow.

The chips 101 scatter upward from the object to be machined 100, pass through the space H1 inside the blade guard 701 and the space H2 inside the discharge pipe 702 in this order, and are discharged to the outside of the circular saw 1. .. In FIG. 6, the safety cover 6 during the cutting operation is schematically shown by a chain double-dashed line. The safety cover 6 faces the blade guard 701 with a space inside the blade guard 701. The chips 101 are discharged to the outside of the circular saw 1 through the space H1 between the inner peripheral surface of the blade guard 701 and the outer peripheral surface of the safety cover 6 and the space H2 inside the discharge pipe 702 in this order. To.

Such an upper cover 70 is an example of a space forming member located above the circular saw blade 5 and forming a space H1 and a space H2 through which the chips 101 pass.

In the example of FIG. 6, the opening 701a is formed closer to the rear of the blade guard 701, and the discharge pipe 702 projects rearward from the blade guard 701. The opening 701a of the blade guard 701 may be formed closer to the front. Further, the discharge pipe 702 may be provided so as to surround the peripheral edge of the opening 701a of the blade guard 701, and the protruding direction thereof can be appropriately changed. For example, the discharge pipe 702 may protrude upward, forward or laterally (for example, on the left side). In short, the position and shape of the discharge pipe 702 are arbitrary as long as a space for discharging the chips 101 to the outside can be formed.

In the above example, the discharge port 702a of the discharge pipe 702 is always open to the external space, but it is not necessarily limited to this. For example, the discharge pipe 702 may be detachably connected to a suction device (not shown). Specifically, the suction device has a suction pipe and a suction pump, and the tip of the suction pipe may be detachably connected to the tip of the discharge pipe 702. The suction pump draws the gas inside the suction pipe with a negative pressure inside the suction pipe. According to this, the chips 101 are forcibly sucked into the suction device through the space H1 and the space H2. Therefore, the chips 101 generated during the cutting operation can be recovered more effectively. Further, if the chips 101 are collected by the suction device, it is possible to prevent the chips 101 from being scattered in the work space.

Next, the electrical configuration of the circular saw 1 will be described. FIG. 7 is a diagram showing an example of the electrical configuration of the circular saw 1. As shown in FIG. 7, the control board 20 includes a drive circuit 21 for driving the motor 10, a control circuit 22 for controlling the drive circuit 21, and a power supply circuit 23. It can be said that the control board 20 is a circuit board. At least one component constituting the drive circuit 21, the control circuit 22, and the power supply circuit 23 is mounted on, for example, one main surface 200 of the control board 20.

The power supply circuit 23 generates a power supply voltage supplied to the circuits included in the control board 20 and the communication board 30 based on the battery voltage output from the battery 3.

The drive circuit 21 includes, for example, an inverter circuit. The inverter circuit includes a plurality of switching elements. As the switching element, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is adopted. As shown in FIGS. 4 and 5, a heat radiating plate 210 for cooling the switching element of the inverter circuit is mounted on the main surface 200 of the control board 20.

The control circuit 22 includes at least one processor to provide control and processing power to perform various functions, as described in more detail below.

According to various embodiments, at least one processor is performed as a single integrated circuit (IC) or as multiple communicable integrated circuits (ICs) and / or discrete circuits. You may. At least one processor can be run according to various known techniques.

In one embodiment, the processor comprises, for example, one or more circuits or units that perform one or more data calculation procedures or processes by executing instructions stored in the associated memory. In other embodiments, the processor may be firmware (eg, a discrete logic component) that performs one or more data computation procedures or processes.

According to various embodiments, the processor is one or more processors, controllers, microprocessors, microcontrollers, application specific integrated circuits (ASICs), digital signal processing devices, programmable logic devices, field programmable gate arrays, or these. Any combination of devices or configurations, or other known device and configuration combinations, may be included to perform the functions described below.

The control circuit 22 can control the operation of the entire circular saw 1. The control circuit 22 controls the rotation of the motor 10 by controlling each switching element of the inverter circuit included in the drive circuit 21. The control circuit 22 controls the drive circuit 21 to rotate the motor 10 when the power switch 40 in the grip portion 71 is in the ON state. On the other hand, the control circuit 22 stops the operation of the drive circuit 21 and stops the rotation of the motor 10 when the power switch 40 is in the off state. Further, the control circuit 22 can control the communication board 30.

As shown in FIG. 7, the communication board 30 includes a board 30A and a communication circuit 31 formed on the board 30A. FIG. 8 is a perspective view showing an example of the appearance of the communication board 30. As shown in FIG. 8, the communication board 30 includes, for example, a rectangular board 30A and includes a pair of main surfaces 300 and side surfaces 310. It can be said that the main surface 300 of the communication board 30 is the main surface of the board 30A, and the side surface 310 of the communication board 30 is the side surface of the board 30A. At least one component constituting the communication circuit 31 is mounted on at least one main surface 300 of the pair of main surfaces 300. The outer shape of the substrate 30A may be other than a rectangle.

The communication circuit 31 is capable of wirelessly communicating with an external communication device of the circular saw 1 in accordance with at least one type of wireless communication standard. Hereinafter, the external communication device of the circular saw 1 may be referred to as an external device. The wireless communication standard to which the communication circuit 31 conforms may include, for example, a standard corresponding to a wireless LAN (Local Area Network) such as WiFi (Wireless Fidelity). Further, the wireless communication standard to which the communication circuit 31 conforms may include a short-range wireless communication standard. For example, the wireless communication standard to which the communication circuit 31 conforms may include Bluetooth (registered trademark), ZigBee (registered trademark), or NFC (Near Field Communication). May be good. Further, the wireless communication standard to which the communication circuit 31 conforms may include a standard corresponding to LPWA (Low Power Wide Area Network). For example, the wireless communication standard to which the communication circuit 31 conforms may include SIGFOX (registered trademark), LoRa (registered trademark) WAN (Wide Area Network), or NB-IoT ( NarrowBand Internet of Things) may be included.

As shown in FIG. 7, the communication circuit 31 includes an antenna 32 and a signal processing circuit 33. The communication board 30 uses the antenna 32 to perform wireless communication with the outside of the circular saw 1. The signal processing circuit 33 includes at least one processor to provide control and processing power to perform various functions, as described in more detail below. The above description of at least one processor included in the control circuit 22 can also be applied to at least one processor included in the signal processing circuit 33.

The signal processing circuit 33 performs various processing such as amplification processing on the received signal received by the antenna 32, and acquires data from the received signal. Further, the signal processing circuit 33 performs various processing such as amplification processing on the transmission signal including the transmission data, and wirelessly transmits the processed transmission signal from the antenna 32.

The transmission data transmitted by the communication circuit 31 to the external device may include the operation number data indicating the number of times the circular saw 1 has been operated. Further, the transmission data may include battery level data indicating the battery level of the battery 3. Further, when the circular saw 1 is provided with a temperature sensor capable of detecting its own temperature, the transmission data may include temperature data indicating the temperature of the circular saw 1. The temperature sensor is mounted on, for example, the control board 20. Further, when the circular saw 1 can specify its own position, the transmission data may include position data indicating the position of the circular saw 1. In this case, the circular saw 1 may include, for example, a GPS receiving circuit that acquires the position data of the circular saw 1 based on a signal from a GPS (Global Positioning System) positioning satellite. The GPS receiving circuit may be mounted on the control board 20 or may be mounted on the communication circuit 31. Further, the circular saw 1 is provided with a circuit for acquiring the position data of the circular saw 1 based on a signal from a GNSS (Global Navigation Satellite System) positioning satellite other than GPS in addition to or instead of a GPS receiving circuit. You may. The circuit may be mounted on the control board 20 or may be mounted on the communication circuit 31. Examples of GNSS other than GPS include GLONASS (Global Navigation Satellite System), IRNSS (Indian Regional Navigation Satellite System), COMPASS, Galileo, and Quasi-Zenith Satellites System (QZSS: Quasi-Zenith Satellites System).

The transmission data transmitted by the communication circuit 31 to the external device may be generated by the control circuit 22, the signal processing circuit 33 of the communication circuit 31, or the control circuit 22 and the signal processing circuit 33. It may be generated in collaboration.

The external device can receive, for example, transmission data from a plurality of circular saws 1 and manage the plurality of circular saws 1 based on the received transmission data.

Note that the data included in the transmission data transmitted by the communication circuit 31 is not limited to the above example. Further, the communication circuit 31 may include only one of a receiving function and a transmitting function.

In this example, the antenna 32 of the communication board 30 is located on the upper cover 70 (that is, the space forming member) (see also FIGS. 3 and 6). The antenna 32 may be located on the surface (for example, the outer peripheral surface) of the upper cover 70. In this case, an insulating protective member may cover the antenna 32. As a result, the antenna 32 can be protected from the outside. Alternatively, the antenna 32 may be embedded inside the upper cover 70 (that is, inside the wall portion constituting the upper cover 70). When the antenna 32 is mounted on the communication board 30, the communication board 30 is also located on the upper cover 70.

Although the position of the antenna 32 on the upper cover 70 is not particularly limited, as a more specific example, the antenna 32 may be located on the discharge pipe 702 of the upper cover 70 as illustrated in FIGS. 3 and 6.

As described above, according to the circular saw 1, the antenna 32 is located on the upper cover 70 located on the side (for example, the left side) of the grip portion 71. On the other hand, when the antenna 32 is located in the grip portion 71 held by the user as in Patent Document 1 described above, there is a high possibility that a human hand is present near the antenna 32. As a result, the reliability of communication by the communication board 30 may be lowered by human hands.

When the antenna 32 is located on the side of the grip portion 71 as in this example, the distance between the hand of the person who grips the grip portion 71 and the antenna 32 can be increased. Therefore, the reliability of communication by the communication board 30 can be improved.

Moreover, in the above example, in the top view, the upper cover 70 is located on the side opposite to the first storage portion 721 with respect to the grip portion 71 (see also FIG. 3). As described above, the motor 10 is housed in the first storage unit 721. When a drive current flows through the motor 10, electromagnetic waves may be generated from the motor 10. Therefore, when the antenna 32 is located in the vicinity of the motor 10, the reliability of communication by the communication board 30 may decrease due to the operation of the motor 10. That is, if the antenna 32 is located on the motor 10 side with respect to the grip portion 71, the antenna 32 may be located near the motor 10 and the communication performance may deteriorate.

On the other hand, if the antenna 32 is located on the upper cover 70 as in this example, the distance between the antenna 32 and the motor 10 can be increased. Therefore, the reliability of communication by the communication board 30 can be improved.

Further, as illustrated in FIGS. 1 to 3, when the antenna 32 is located in the discharge pipe 702, the reliability of communication can be further improved for the following two reasons. First, the discharge pipe 702 is located above the blade guard 701 and projects rearward. Therefore, the distance between the discharge pipe 702 and the circular saw blade 5 is larger than the distance between the blade guard 701 and the circular saw blade 5. That is, if the antenna 32 is located on the discharge pipe 702, the distance between the antenna 32 and the circular saw blade 5 can be increased. Since the circular saw blade 5 is made of metal and has conductivity, the influence on the communication of the conductive circular saw blade 5 is reduced by increasing the distance between the antenna 32 and the circular saw blade 5. can do. In other words, the reliability of communication can be further improved.

Second, the discharge pipe 702 has a substantially cylindrical shape and protrudes to the rear side. If the antenna 32 is located on the outer peripheral curved surface of the discharge pipe 702, the antenna 32 faces the external space at a wider angle. For comparison, the structure in which the antenna 32 is located on the flat member will be described. In this case, there is almost no flat member on one side of the flat member in the normal direction with respect to the antenna 32, and the flat member is present on the other side. On the other hand, when the antenna 32 is located in the discharge pipe 702, the discharge pipe 702 is almost absent outside the antenna 32 in the radial direction. That is, the discharge pipe 702 hardly exists not only in one direction with respect to the antenna 32 but also in the obliquely outward direction. These members can interfere with communication. That is, since the antenna 32 is located in the discharge pipe 702, it is possible to reduce communication obstacles in the external space facing the antenna 32 and improve the reliability of communication.

In the above example, although the communication circuit 31 is connected to the control circuit 22, it is not necessarily limited to this. The communication circuit 31 may wirelessly communicate with an external device independently of the control circuit 22. For example, when the communication circuit 31 is connected to the GPS receiving circuit, the communication circuit 31 can transmit the position data of the circular saw 1 to an external device without depending on the operation of the control circuit 22. The position of the circular saw 1 can be managed by the external device that has received the position data. According to this, for example, when the circular saw 1 is lost or stolen by a third party, the circular saw 1 can be tracked.

Next, another example of the circular saw 1 will be described. 9 is a perspective view showing an example of the appearance of the circular saw 1A, FIG. 10 is a top view showing an example of the appearance of the circular saw 1A, and FIG. 11 is a side view showing an example of the appearance of the circular saw 1A. , FIG. 12 is a diagram schematically showing an example of the cross-sectional structure of the circular saw 1A. The circular saw 1A has the same configuration as the circular saw 1 except for the presence / absence of the dust collecting box 8 and the position of the antenna 32.

The dust collection box 8 includes a dust collection box housing 80 and an antenna 32. The dust collection box housing 80 is a member for collecting chips 101 generated from the object to be processed 100, and is detachably attached to the upper cover 70. The dust collecting box housing 80 is located above the upper cover 70 in the mounted state. The dust collecting box housing 80 may be formed of, for example, an insulating member (for example, resin).

FIG. 13 is a perspective view showing an example of the configuration of the circular saw 1A from which the dust collecting box 8 has been removed. As shown in FIG. 13, the upper cover 70 may further include an opening / closing member 703. The opening / closing member 703 is located closer to the front of the blade guard 701 and is attached to the blade guard 701 so as to be openable / closable. When the opening / closing member 703 is open, the opening 701b is formed in the blade guard 701. The opening 701b penetrates the blade guard 701 along its thickness direction. That is, the opening 701b connects the space above the blade guard 701 and the space H1 below. When the opening / closing member 703 is closed, the opening 701b is closed.

For example, the opening / closing member 703 may be rotatably connected to the blade guard 701 via a hinge portion 704 at its front end. The hinge portion 704 rotatably connects the front end portion of the opening / closing member 703 to the blade guard 701 about a rotation axis along the left-right direction. The opening / closing member 703 opens upward to expose a part of the circular saw blade 5 and a part of the space above the circular saw blade 5 through which chips pass.

The dust collection box housing 80 has a bag-like shape with an open tip port 8a (see FIG. 12). In the illustrated example, the dust collecting box housing 80 includes an upper side wall 81, a lower side wall 82, a right side wall 83, a left side wall 84, and a rear end wall 85, which are connected in a bag shape as a whole. Has been done. Specifically, the lower side wall 82 faces the upper cover 70 in the vertical direction across the space H3. The upper side wall 81 is located above the lower side wall 82. The right side wall 83 connects the right peripheral edge of the upper side wall 81 and the right peripheral edge of the lower side wall 82, and the left side wall 84 connects the left peripheral edge of the upper side wall 81 and the left peripheral edge of the lower side wall 82. The right side wall 83 and the left side wall 84 face each other with a space H3 in the left-right direction. The right side wall 83 is located on the right side with respect to the left wall 84. The rear end wall 85 connects the upper side wall 81, the lower side wall 82, the right side wall 83, and the rear peripheral edge of the left side wall 84 to each other. The tip opening 8a may be formed by the upper side wall 81, the lower side wall 82, the right side wall 83, and the front peripheral edge of the left side wall 84.

The dust collection box housing 80 is attached to the upper cover 70 so that its tip port 8a is connected to the opening 701b of the upper cover 70. Therefore, in the mounted state, the space H3 inside the dust collecting box housing 80 is opened to the circular saw blade 5 side by the tip port 8a. In other words, the space H3 inside the dust collecting box housing 80 is connected to the space H1 between the blade guard 701 and the circular saw blade 5.

In such a circular saw 1A, chips 101 generated from the object to be machined 100 during the cutting operation are inside the dust collection box housing 80 through the space H1 between the blade guard 701 and the circular saw blade 5. It is collected in space H3. As a result, it is possible to prevent the chips 101 from being scattered in the work space during the cutting operation.

The dust collecting box housing 80 may include a detachable button 801 for releasing the attachment to the circular saw 1. As shown in FIGS. 9 and 11, the detachable button 801 may be exposed on the left side wall 84 of the dust collection box housing 80. Further, the dust collecting box housing 80 may include a closing member 86 that closes the discharge port 702a of the discharge pipe 702 of the upper cover 70. The closing member 86 is located on the rear side and the lower side of the dust collecting box housing 80, and for example, the discharge pipe 702 may be housed to close the discharge port 702a. By closing the discharge port 702a, it is possible to prevent the chips 101 from being discharged into the work space from the discharge port 702a of the upper cover 70.

As described above, the dust collection box housing 80 is located above the upper cover 70 and forms a space H3 for collecting chips 101. Therefore, the dust collecting box housing 80 is an example of a space forming member located above the circular saw blade 5 and forming a space through which the chips 101 pass.

The rear end wall 85 may be attached to the upper side wall 81, the lower side wall 82, the right side wall 83, and the left side wall 84 so as to be openable and closable. According to this, the chips 101 collected inside the dust collecting box housing 80 can be discharged to the outside with the rear end wall 85 open. That is, the rear end wall 85 functions as a cover for discharging chips.

In this circular saw 1A, the antenna 32 is located in the dust collection box housing 80. The antenna 32 may be located on the surface (for example, the outer peripheral surface) of the dust collecting box housing 80. In this case, an insulating protective member may cover the antenna 32. As a result, the antenna 32 can be protected from the outside. Alternatively, the antenna 32 may be embedded inside the wall portion constituting the dust collecting box housing 80.

Although the position of the antenna 32 in the dust collection box housing 80 is not particularly limited, as a more specific example, the antenna 32 is located on the upper side wall 81 of the dust collection box housing 80 as illustrated in FIGS. 9 to 12. May be good.

The communication circuit 31 may also be located in the dust collection box housing 80. That is, the communication board 30 may be located in the dust collection box housing 80. Further, for example, the GPS receiving circuit may also be located in the dust collecting box housing 80. This GPS receiving circuit is connected to the communication circuit 31. The communication circuit 31 does not have to be connected to the control circuit 22. For example, the communication circuit 31 wirelessly transmits the position data received from the GPS receiving circuit to an external device. According to this, the position of the dust collecting box 8 can be managed in the external device. Therefore, for example, if the dust collection box 8 is lost or stolen by a third party, the dust collection box 8 can be tracked.

Alternatively, the communication circuit 31 may be connected to the control circuit 22. In this case, the dust collecting box housing 80 and the upper cover 70 may be provided with connectors that realize electrical connection, respectively. The antenna 32 (and thus the communication circuit 31) of the dust collection box 8 and the control circuit 22 in the housing 7 can be electrically connected via the connector. Note that all or part of the communication circuit 31 may be arranged in the housing 7.

The dust collection box housing 80 is located above the upper cover 70 in the mounted state. Since the upper cover 70 is located on the side (for example, the left side) of the grip portion 71 in the top view, the dust collecting box housing 80 is also located on the side of the grip portion 71 (see FIG. 10). Therefore, the distance between the antenna 32 located in the dust collecting box housing 80 and the hand of the person who grips the grip portion 71 can be increased. Therefore, in the circular saw 1A as well, the reliability of communication can be improved as in the circular saw 1.

Further, since the dust collection box housing 80 is located above the upper cover 70, the distance between the antenna 32 located in the dust collection box housing 80 and the circular saw blade 5 can be further increased. Therefore, the reliability of communication can be further improved.

In the above example, the first storage portion 721 for storing the motor 10 is located on the side opposite to the dust collection box housing 80 with respect to the grip portion 71. According to this structure, the distance between the antenna 32 located in the dust collecting box housing 80 and the motor 10 can be increased. Therefore, the communication performance can be further improved.

Further, as illustrated in FIGS. 9 to 12, if the antenna 32 is located on the upper portion (that is, the upper side wall 81) of the dust collection box housing 80, the reliability of communication is further improved as described below. be able to.

That is, while the space on the right side of the dust collection box housing 80 (that is, the grip portion 71 side) has a relatively large number of components of the circular saw 1 (see FIG. 10), the dust collection box housing 80 In the space above, the components of the circular saw 1 occupy a small proportion (see FIG. 9), and there are few communication obstacles. Therefore, the reliability of communication can be improved.

Moreover, since the user is usually located on the right side and the rear side of the grip portion 71 during the cutting operation, it is unlikely that the user exists in the space above the dust collecting box housing 80. Further, during the cutting operation, there is a possibility that another structure (for example, a part of the object to be machined or a wall constituting the work space) exists in the vicinity of the side (for example, the left side) of the circular saw 1. .. On the other hand, it is unlikely that such a structure will be located in the vicinity above the dust collection box housing 80.

Therefore, if the antenna 32 is located on the upper side wall 81 of the dust collection box housing 80, there are few obstacles in communication in the external space facing the antenna 32 even during the cutting operation. Therefore, the reliability of communication can be improved even during the disconnection operation.

The space on the right side of the dust collection box housing 80 has a relatively large number of components of the circular saw 1, whereas the space on the left side has a relatively small number of components of the circular saw 1. .. Therefore, the antenna 32 may be located on the left side wall 84 of the dust collecting box housing 80. The reliability of communication in this case may be inferior to the structure in which the antenna 32 is located on the upper side wall 81 of the dust collection box housing 80, but the antenna 32 is the right side wall 83 (that is, the grip portion 71) of the dust collection box housing 80. Higher than the structure located on the side wall).

Further, in the example of FIG. 12, the upper side wall 81 of the dust collecting box housing 80 is closer to the circular saw blade 5 at the front end portion thereof, and the circular saw blade 5 is directed from the front end portion toward the rear side. It is extended so as to move away from. That is, the distance between the front end of the upper side wall 81 and the circular saw blade 5 is larger than the distance between the rear end of the upper side wall 81 and the circular saw blade 5. In this case, the antenna 32 may be located on the upper side wall 81 in a region closer to the rear end than the front end of the upper side wall 81. According to this, the distance between the antenna 32 and the circular saw blade 5 can be further increased, and the reliability of communication can be further improved.

In the above example, a set of the dust collecting box housing 80 and the antenna 32 was grasped as the dust collecting box 8. However, if the dust collecting box 8 is grasped as a dust collecting box with a communication function, the dust collecting box housing 80 can be grasped as a dust collecting box. That is, it can be said that the antenna 32 is located in the dust collecting box housing 80, and can be said to be located in the dust collecting box 80.

Next, another example of the circular saw 1 will be described. FIG. 14 is a perspective view showing an example of the appearance of the circular saw 1B, and FIG. 15 is a side view showing an example of the appearance of the circular saw 1B. The configuration of the circular saw 1B is mainly the same as that of the circular saw 1A, but in the circular saw 1B, the shape of the dust collection box 8 (hereinafter referred to as the dust collection box 8B) is different from that of the circular saw 1A. are doing.

The dust collection box 8B includes a dust collection box housing 80B and an antenna 32. Like the dust collecting box housing 80, the dust collecting box housing 80B includes an upper side wall 81, a lower side wall 82, a right side wall 83, a left side wall 84, and a rear end wall 85. Further, the dust collecting box housing 80B includes a discharge pipe 86B. The space inside the dust collection box housing 80B is mainly formed by the upper side wall 81, the lower side wall 82, the right side wall 83, the left side wall 84, and the rear end wall 85, and is in the mounted state like the dust collection box housing 80. It is connected to the space H1 between the upper cover 70 and the circular saw blade 5.

The discharge pipe 86B has a tubular shape and connects the internal space and the external space of the dust collection box housing 80B. For example, the rear end wall 85 of the dust collecting box housing 80B may be formed with an opening penetrating itself in the front-rear direction, and the base end of the discharge pipe 86B may be connected so as to surround the peripheral edge of the opening. The discharge pipe 86B may protrude to the rear side. That is, the discharge pipe 68B is projected from the dust collection box housing 80B. A cap 87B may be detachably attached to the discharge port on the distal end side of the discharge pipe 86B. When the cap 87B is attached, the discharge port of the discharge pipe 86B is closed, and when the cap 87B is removed, the discharge port of the discharge pipe 67B opens into the space outside the circular saw 1B.

For example, the user performs the cutting work with the cap 87B attached. During this cutting operation, the chips 101 generated from the object to be processed 100 are collected in the space inside the dust collecting box housing 80B. When the user removes the cap 87B after the cutting operation, the chips 101 collected inside the dust collecting box housing 80B can be discharged to the outside of the dust collecting box housing 80B.

The discharge pipe 86B may be connected to an external suction device (not shown) with the cap 87B removed. In this state, the inside of the dust collecting box housing 80B becomes a negative pressure, and the chips 101 generated from the object to be processed 100 pass through the inside of the dust collecting box housing 80B and are sucked into the suction device. As a result, the chips 101 generated during the cutting operation can be more effectively collected in the suction device.

The dust collection box housing 80B is detachably attached to the upper cover 70 of the circular saw 1B in the same manner as the dust collection box housing 80 of the circular saw 1A. The dust collecting box housing 80B is located above the upper cover 70 in the mounted state. FIG. 16 is a perspective view showing an example of the configuration of the circular saw 1B from which the dust collecting box 8B has been removed. In the example of FIG. 16, the upper cover 70 (hereinafter, referred to as the upper cover 70B) of the circular saw 1B includes a blade guard 701B and an opening / closing member 702B. In the example of FIG. 16, the discharge pipe 702 of the circular saw 1 is not arranged on the upper cover 70B.

The blade guard 701B, like the blade guard 701, covers the upper side of the peripheral edge of the circular saw blade 5. The blade guard 701B is formed with an opening 701b. The opening 701b penetrates the blade guard 701B in the thickness direction, and connects the space above the blade guard 701B and the space below the blade guard 701B to each other.

The opening / closing member 702B is attached to the blade guard 701B so as to be openable / closable. The opening / closing member 702B is slidably attached to the blade guard 701B in the left-right direction. When the opening / closing member 702B is closed, the opening 701b of the blade guard 701B is closed by the opening / closing member 702B. On the other hand, when the opening / closing member 702B slides to the right, for example, the opening / closing member 702B opens. As a result, the opening 701b opens upward.

The dust collection box housing 80B is attached to the upper cover 70B with the opening / closing member 702B open. Specifically, the dust collection box housing 80B is attached to the blade guard 701 so that the tip port of the dust collection box housing 80B is connected to the opening 701b.

In such a circular saw 1B as well, the antenna 32 is located in the dust collecting box housing 80B as in the circular saw 1A. According to this, the reliability of communication can be improved as in the case of the circular saw 1A. Although the position of the antenna 32 in the dust collecting box housing 80B is not particularly limited, it may be located on the upper side wall 81 or the left side wall 84 as in the dust collecting box housing 80, for example. Alternatively, as illustrated in FIG. 15, the antenna 32 may be located in the discharge pipe 86B of the dust collection box housing 80B. According to this, the reliability of communication can be further improved as in the discharge pipe 702 of the upper cover 70.

As described above, the circular saw and the dust collecting box for the circular saw have been described in detail, but the above description is an example in all aspects, and this disclosure is not limited thereto. In addition, the various modifications described above can be applied in combination as long as they do not contradict each other. And it is understood that innumerable variations not illustrated can be assumed without departing from the scope of this disclosure.

1 Circular saw 5 Circular saw blade 70 Space forming member (upper cover)
71 Grip 10 Motor 32

Antenna

80,80B Space forming member (dust collection box housing)
81 Upper part (upper side wall)
86B Discharge pipe 100 Machining object 101 Chips 701 Blade guard 702 Discharge pipe

Claims

A circular saw blade having first and second main surfaces facing each other,
A motor that rotates the circular saw blade and
A space-forming member located above the circular saw blade and forming a space through which chips of a work object cut by the circular saw blade pass.
A grip portion located on the first main surface side with respect to the circular saw blade and the space forming member, and
A circular saw with an antenna located on the space forming member.
The circular saw according to claim 1.
The antenna is a circular saw located on the upper side of the space forming member.
The circular saw according to claim 1 or 2.
The space forming member is
A blade guard that covers the upper side of the peripheral edge of the circular saw blade,
Including a discharge pipe that is connected to the blade guard and projects from the blade guard.
The antenna is a circular saw located in the discharge tube.
The circular saw according to claim 1 or 2.
The space forming member is
A circular saw that includes a dust collection box that opens to the blade side and has an internal space for collecting the chips.
The circular saw according to claim 4.
The dust collecting box is
The dust collecting box housing forming the internal space and
Including a discharge pipe for discharging chips projecting from the dust collection box housing.
The antenna is a circular saw located in the discharge tube.
The circular saw according to claim 4 or 5.
Further provided with a blade guard covering the upper side of the peripheral edge of the circular saw blade
The dust collecting box is a circular saw located above the blade guard and detachably attached to the blade guard.
The circular saw according to any one of claims 1 to 6.
The motor is a circular saw located on the first main surface side with respect to the circular saw blade.
A dust collection box that can be detachably attached to a circular saw that includes a circular saw blade that cuts the object to be machined.
While mounted on the circular saw, it is located above the peripheral edge of the circular saw blade and opens to the circular saw blade side to form an internal space for collecting chips from the workpiece. Dust collection box housing and
A dust collection box for a circular saw, comprising an antenna located in the dust collection box housing.