JP2018079632A - Portable cutter for woodworking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable cutter for woodworking with increased cooling efficiency of an electric motor without damaging use feeling, which is a portable cutter for woodworking with an electric motor and a controller, to solve the problem that: in a conventional portable cutter for woodworking with an electric motor and a controller, cooling air is discharged from an upper part of a housing and is blown to a user and use feeling of the portable cutter for woodworking is damaged; the problem is resolved by inverting a flow of cooling air upside down but in this case ambient air introduced is blown to the electric motor after being warmed by a controller with inner packaging at the upper side of a housing and cooling efficiency of the electric motor decreases.SOLUTION: A controller 33 is provided upward of an electric motor 15 in the position where it overlaps with the electric motor 15 in plan view and an inlet port 5a of cooling air is provided in a housing 5 downward of the controller 33 and upward of the electric motor 15 in a vertical direction.SELECTED DRAWING: Figure 3

Description

  The present invention is a portable cutting machine for woodworking called a trimmer (English notation: Laminate Trimmer) or a router, and is mainly used for edge processing and grooving processing of workpieces such as wood. The present invention relates to a woodworking portable cutting machine for use in the manufacturing process.

  In general, portable cutting machines for woodworking include an electric motor as a drive source, a housing that houses the electric motor, an output shaft that is rotated by the driving force of the electric motor, and a base that abuts on the upper surface of the workpiece. ing. The axial direction of the output shaft is provided perpendicular to the lower surface of the base. Cutting can be performed by attaching the cutting tool to the tip of the output shaft and projecting the cutting tool downward from the base while pressing the cutting tool against the edge of the workpiece while rotating around the shaft.

  Conventional techniques relating to this portable cutting machine for woodworking are disclosed in the following patent documents. The following patent documents disclose a woodworking portable cutting machine equipped with a controller or control board for controlling the operation of an electric motor. In particular, Patent Document 2 discloses a technology for cooling an electric motor and a controller by introducing outside air into a housing.

Japanese Patent Laid-Open No. 11-164579 JP 2012-196866 A

  However, the technique disclosed in Patent Document 2 has the following problems. According to the technique disclosed in Patent Document 2, the outside air sucked from the air inlet provided in the lower part of the housing flows upward, cools the electric motor and the controller, and then exhausts from the upper part of the housing. . For this reason, there has been a problem that the exhaust discharged from the upper part of the housing is blown to the user and the usability (workability) of the portable cutting machine for woodworking is impaired.

  Such a conventional problem can be solved by introducing the outside air from the upper part of the housing and exhausting it from the lower side to reverse the flow of the cooling air. In this case, the introduced outside air is introduced to the upper part of the housing. After being warmed by the hot air of the built-in controller, the electric motor is blown, and the cooling efficiency of the electric motor is reduced.

  An object of the present invention is to improve the cooling efficiency of an electric motor without causing a problem that impairs the feeling of use as in a conventional portable cutting machine for woodwork including an electric motor and a controller.

  Said subject is solved by each following invention.

  1st invention is the portable cutting machine for woodwork used when cutting and grooving the edge of workpieces, such as wood. This portable woodworking cutting machine has an electric motor, a housing that houses the electric motor, a blade that is rotated by the driving force of the electric motor, and a workpiece that is brought into contact with the workpiece and protrudes downward. And a base. In the first invention, a controller that controls the drive of the electric motor is provided above the electric motor at a position overlapping the electric motor in plan view. In the first invention, in the housing, the cooling air intake port is provided below the controller and above the electric motor in the vertical direction.

  According to the first invention, the outside air flowing in from the intake port flows downward to cool the electric motor. Since the outside air flows downward, the outside air that is not heated by the controller located above the intake port can be used for cooling the electric motor, thereby improving the cooling efficiency of the electric motor. In addition, since the outside air sucked in from the air intake port is flowed downward and exhausted, the exhaust is not blown toward the user, and the feeling of use of the portable cutting machine for woodworking is not impaired. .

  According to a second invention, in the first invention, a part of the outside air flowing in from the air inlet flows downward to directly cool the electric motor, and the other part flows upward to directly connect the controller. This is a portable woodworking cutting machine configured to be cooled.

  According to the second invention, the controller is cooled by the other part of the outside air flowing in from the intake port.

  3rd invention is the portable cutting machine for woodwork provided with the controller which has flat plate shape in 2nd invention. In the present invention, the controller is arranged in a posture in which the thickness direction is the vertical direction. Further, in the present invention, the controller is arranged so that air directed upward from the intake port is guided to a plane formed between the shortest sides of the controller.

  According to the third invention, the cooling efficiency of the controller can be increased by cooling the plane (side surface) formed between the shortest sides of the controller.

  4th invention is the portable cutting machine for woodwork which provided the vertical wall part which occupies half or more of the opening area of an inlet port in the back | inner side of an inlet port in any one invention of 1st-3rd.

  According to the fourth aspect of the invention, the air that has entered from the intake port once hits the vertical wall, and then a part of the air flows upward, whereby the controller can be cooled.

  The fifth invention is the portable woodworking apparatus according to any one of the first to fourth inventions, wherein the upper portion of the housing bulges in the radial direction, and the intake port is provided in a region bulged in the vertical direction of the housing. It is a cutting machine.

  According to the fifth invention, in the portable cutting machine for woodwork, a portion having a function as a grip that is normally gripped by a user is avoided, and an air inlet is provided in the bulging portion of the housing. With such a configuration, it is possible to prevent the hand held when the user grips the housing from moving upward, thereby preventing the intake port from being blocked by the hand. By preventing the intake port from being inadvertently blocked by hand, the cooling efficiency of the electric motor can be maintained high.

It is a whole perspective view of the portable cutting machine for woodworking of this embodiment. It is a right view of the portable cutting machine for woodworking of this embodiment. It is sectional drawing which shows the III-III cross-section arrow in FIG. 2, Comprising: It is a longitudinal cross-sectional view of the portable cutting machine for woodworking. It is an enlarged view of the (IV) part in FIG. It is sectional drawing which shows the VV cross-section arrow of FIG. 3, Comprising: It is a cross-sectional view of the portable cutting machine for woodworking. FIG. 2 is a perspective view of a portion corresponding to the right half in FIG. 1 when the tool body in the portable cutting machine for woodworking of the present embodiment is separated on the left and right. FIG. 2 is a perspective view of a portion corresponding to the left half in FIG. 1 when the tool body in the portable woodworking cutting machine of the present embodiment is separated on the left and right. In the portable cutting machine for woodworking of this embodiment, it is the whole perspective view at the time of replacing the base for trimmer (fixed type) with the base for router (plunge type).

  Next, an embodiment of the present invention will be described with reference to FIGS. In the following, for ease of explanation, the top, bottom, front, back, left, and right are defined as shown in the drawings. In this embodiment, what is called a trimmer 1 is illustrated in FIGS. 1-3 as an example of the portable cutting machine for woodworking. As shown in FIGS. 1 to 3, the trimmer 1 includes a tool body 10 that houses an electric motor 15 as a drive source, and a trimmer (fixed type) for holding the tool body 10 against a workpiece W. ) Base 20. The trimmer 1 of this embodiment has a configuration in which the tool body 10 and the base 20 can be separated from each other.

  As shown in FIG. 3, the tool body 10 includes a housing 5 made of resin and having a left-right halved structure. A right half 5R of the housing 5 separated into the left and right is shown in FIG. 6, and a left half 5L is shown in FIG. As shown in FIGS. 6 and 7, the housing 5 includes a cylindrical portion 5A having a cylindrical shape, and a bulging portion 5B that bulges laterally from the upper portion of the cylindrical portion 5A. As shown in FIGS. 1 to 3, a cover case 6 having a cylindrical shape is mounted on the outer peripheral side of the cylindrical portion 5 </ b> A of the housing 5. The lower side of the housing 5 has a two-layer structure of a cylindrical portion 5 </ b> A and a cover case 6. A bulging portion 5B is provided from the upper portion of the cover case 6 so as to bulge mainly in the front-rear direction. A base 20 can be attached to the outer peripheral side of the cover case 6. The base 20 is provided with a grip portion 23 that functions as a grip portion that a user grips. The cylindrical portion 5 </ b> A is provided with a thickness (diameter) appropriate for the user to grip the grip portion 23. Details of the base 20 and the gripping portion 23 will be described later.

  As shown in FIG. 3, an electric motor 15 is built in the cylindrical portion 5 </ b> A of the housing 5. The electric motor 15 is a so-called brushless DC motor, and includes a rotor 15a, a stator 15b, and a sensor substrate 15c. The output shaft 11 coupled to the rotor 15a is rotatably supported by the housing 5 via bearings 30 and 31. The stator 15 b is fixed along the inner peripheral side of the cylindrical portion 5 </ b> A of the housing 5. A rotor 15a is arranged on the inner peripheral side of the stator 15b. The sensor substrate 15c is fixed along the upper surface of the stator 15b. A magnetic sensor for detecting the rotational position of the rotor 15a is mounted on the sensor substrate 15c.

  A blower fan 32 is attached to the output shaft 11. The blower fan 32 is located between the rotor 15a and the lower bearing 30 with respect to the vertical position. With the activation of the electric motor 15, the blower fan 32 rotates integrally with the output shaft 11. The blower fan 32 is provided in the direction of the wings in which the wind flows downward from above by rotation thereof. By the rotation of the blower fan 32, outside air is introduced into the housing 5 through the air inlet 5 a provided in the bulging portion 5 </ b> B of the housing 5. The electric motor 15 is cooled by the introduced outside air. Details of the intake port 5a will be described later.

  The output shaft 11 of the electric motor 15 protrudes downward from the lower surfaces of the housing 5 and the cover case 6. A nut 13 for attaching a tip cutter 12 is provided at the tip of the output shaft 11. The tip blade 12 can be replaced by loosening the nut 13. The tip cutter 12 attached to the output shaft 11 protrudes further downward from the lower surface of the base portion 21 of the base 20.

  As shown in FIG. 1, a standby switch 14a and a lock-on switch 14b are provided on the upper surface of the tool body 10 and on the front surface of the bulging portion 5B. The standby switch 14a and the lock-on switch 14b are constituted by pressing switches, and have pressing pieces that can be moved by a predetermined stroke amount by a pressing operation. By pressing the standby switch 14a once, the standby switch 14a is turned on. When the standby switch 14a is turned on, the trimmer 1 shifts from a pause state to a standby state in which the electric motor 15 starts to be driven. In the standby state, power is supplied from the battery pack 16 to the controller 33. By pressing the lock-on switch 14b once, the lock-on switch 14b is turned on. When the lock-on switch 14b is turned on when the trimmer 1 is in the standby state, a state in which power is supplied from the battery pack 16 to the electric motor 15 is maintained. As a result, the trimmer 1 shifts from the standby state to a driving state in which the electric motor 15 is driven and this driving is maintained. When the standby switch 14a or the lock-on switch 14b is pressed once while the trimmer 1 is in the driving state, the controller 33 performs control to stop the power supply from the battery pack 16 to the controller 33 and the electric motor 15, respectively. Return to hibernation. If the predetermined time has passed without the lock-on switch 14b being pressed when the trimmer 1 is in the standby state, the controller 33 performs control to turn off the standby switch 14a, and the trimmer 1 is released from the standby state. And return to hibernation. A shift dial 34 is provided on the right side of the bulging portion 5B. The rotational speed of the electric motor 15 can be adjusted by rotating the speed change dial 34. Details of the battery pack 16 and the controller 33 will be described later.

  As shown in FIG. 3, a controller 33 for mainly controlling the operation of the electric motor 15 is built in the bulging portion 5 </ b> B of the housing 5 above the electric motor 15. The controller 33 is a resin board that contains a control board in a rectangular shallow case, and has a generally flat plate shape. The controller 33 is accommodated in the bulging portion 5B in a posture in which the thickness direction is the vertical direction. Specifically, the lower surface 33c of the controller 33 is provided at a position that is above the intake port 5a in the vertical direction and at a position that overlaps the electric motor 15 in plan view. The controller 33 includes a control circuit composed of a microcomputer that transmits a control signal based on the rotational position information of the rotor 15a detected by the sensor substrate 15c, a drive circuit composed of an FET that switches the current of the electric motor 15, and a battery. An auto stop circuit that detects the power supply state of the pack 16 and shuts off the power supply to the electric motor 15 so as not to be overdischarged or overcurrent according to the result is mounted.

  A battery attachment portion 7 for attaching a battery pack 16 as a power source is provided on the upper portion of the tool body 10 and on the upper surface of the bulging portion 5B. The battery pack 16 is a lithium ion battery in which a plurality of battery cells are housed in a case, and can be repeatedly used by charging with a separately prepared charger. As shown by a white arrow in FIG. 1, the battery pack 16 is attached by sliding to the front side with respect to the battery attachment portion 7 and removed by sliding to the rear side.

  The base 20 includes a disk-shaped base portion 21 that abuts on the upper surface of the workpiece W and a cylindrical main body support portion 22. In the center of the base portion 21, an inner peripheral hole 21a for allowing the output shaft 11 and the tip cutter 12 of the tool body 10 to pass to the lower surface side is provided. The cylindrical portion 5 </ b> A of the housing 5 and the cover case 6, which are the lower part of the tool main body 10, are inserted on the inner peripheral side of the main body support portion 22, and the tool main body 10 is held by the base 20. The base 21 is brought into contact with the upper surface of the workpiece W, the tip cutter 12 is pressed mainly against the edge of the workpiece W, and the trimmer 1 is moved along the edge in this pressed state. Thus, the edge processing (cutting) of the workpiece W can be performed.

  The main body support portion 22 is provided as a grip portion 23 for the user whose outer surface is covered with an elastomer resin. A clamp device 24 is provided on the front surface of the main body support portion 22. When the clamp lever 24a of the clamp device 24 is tilted to the unclamping position on the front side in FIG. 1, the main body support portion 22 is loosened in the diameter increasing direction, and the tool main body 10 can be detached from the base 20. When the clamp lever 24 a is tilted to the clamp position shown in FIG. 1, the main body support portion 22 is contracted in the diameter reducing direction, and the tool main body 10 is firmly clamped with respect to the main body support portion 22.

  By adjusting the vertical mounting position of the tool body 10 with respect to the base 20, the cutting depth of the tip cutter 12 with respect to the workpiece W can be adjusted. On the front surface of the base 20, scales 18 and 19 for displaying a protruding dimension (cut depth) from the lower surface of the base portion 21 of the tip cutter 12 are displayed. The cutting depth of the tool blade 10 in the vertical direction with respect to the base 20 and the cutting depth of the tip blade 12 with respect to the workpiece W can be finely adjusted by rotating the adjustment dial 25.

  An intake port 5a for introducing outside air for cooling the motor is provided on the left and right sides of the bulging portion 5B of the housing 5. As shown in FIG. 6, one intake port 5 a is provided in the right half portion 5 </ b> R of the housing 5. As shown in FIG. 7, two intake ports 5 a are provided in the left half portion 5 </ b> L of the housing 5. The three intake ports 5a in total are provided in a rectangular shape penetrating the left and right side portions of the bulging portion 5B and having the longitudinal direction in the longitudinal direction. As shown in FIGS. 3 and 5, a total of three intake ports 5 a are provided between the electric motor 15 and the controller 33 in the vertical direction.

  Each of the total three intake ports 5a is provided with a vertical wall portion 5b on the back side (downstream side in the outside air inflow direction) from the intake port 5a when viewed from the outside. The three vertical wall portions 5b are integrally provided on the inner surfaces of the left and right half portions 5R and 5L of the housing 5, respectively. The three vertical wall portions 5b each have an L-shaped cross section that extends horizontally from the lower portion of the intake port 5a toward the inside of the housing 5 and then extends upward. The portion where each of the three vertical wall portions 5b extends upward has an area that occupies half or more of the opening area of the intake port 5a.

  Moreover, as shown in FIG. 5, the side wall part 5c which covers the front and back is provided between the inlet port 5a and the vertical wall part 5b. Both the vertical wall portion 5b and the side wall portion 5c are integrally provided when the housing 5 is molded with resin. The side wall 5c is provided at the same height as the vertical wall 5b. The vertical wall portion 5b and the side wall portion 5c connected to each other are provided with a U-shaped cross section in a plan view.

  In FIG. 4, the flow of outside air flowing into the housing 5 through the intake port 5a is indicated by arrows Qa and Qb. In this embodiment, the vertical wall part 5b is provided in the back part (downstream side of an external air inflow direction) of the inlet port 5a. For this reason, the outside air that has flowed in from the intake port 5a once hits the vertical wall 5b and flows upward along the vertical wall 5b and into a downward flow Qb that bypasses the upper side of the vertical wall 5b. Divided. If the vertical wall portion 5b is not provided in the inner part of the intake port 5a, almost all of the outside air flowing from the intake port 5a flows downward.

  The upward flow Qa along the vertical wall portion 5b is sprayed mainly on the left and right side surfaces 33a of the controller 33. The controller 33 is efficiently cooled by directly blowing the fresh air just after being introduced to the left and right side surfaces 33a of the controller 33.

  The electric motor 15 is cooled by the flow Qb that detours on the upper side of the vertical wall portion 5b and then goes downward. The outside air introduced from the intake port 5a flows downward and is directly blown, whereby the electric motor 15 is efficiently cooled. The cooling air flowing downward is exhausted through an exhaust port 10d provided in the lower part of the tool body 10 as shown in FIG.

  A part of the downward flow Qb is blown against the lower surface 33 c of the controller 33. The controller 33 is also cooled by the external air being directly blown onto the lower surface 33 c of the controller 33.

  According to the trimmer 1 configured as described above, since the intake port 5a is disposed between the electric motor 15 and the controller 33 in the vertical direction, the outside air flowing from the intake port 5a It flows to the electric motor 15 side without being heated by heat generation. Thereby, the electric motor 15 can be directly cooled by the cold outside air, and the cooling efficiency of the electric motor 15 can be increased.

  Further, a part of the outside air that has entered from the intake port 5 a is blown to the controller 33, whereby the controller 33 can also be cooled. In particular, a vertical wall portion 5b bent upward in an L shape is provided at the back of the intake port 5a (downstream in the direction of inflow of outside air). A part of the outside air flowing in from the intake port 5a hits the vertical wall portion 5b and flows upward, and is blown to the left and right side surfaces 33a and the front and rear side surfaces 33b of the controller 33. According to the illustrated embodiment, the side wall portions 5c are provided on the front and rear sides of the vertical wall portions 5b provided at the three locations, so that the upward flow of the outside air by the vertical wall portions 5b is more efficiently performed. . Further, after a part of the outside air flowing in from the intake port 5a hits the vertical wall portion 5b, it is blown against the lower surface 33c of the controller 33 by diverting downward while bypassing the upper side of the vertical wall portion 5b. The introduced outside air is blown to almost all surfaces of the controller 33, whereby the controller 33 is cooled.

  Furthermore, the illustrated intake port 5 a is provided in the upper portion of the tool body 10 and in the bulging portion 5 B in the upper portion of the housing 5. The grip portion 23 that the user grips is provided on the outer surface of the base 20. For this reason, when the user grips the grip portion 23, the intake port 5a is not blocked by the user's hand. As a result, the introduction of outside air through the intake port 5a is ensured, and the electric motor 15 is reliably cooled.

  As shown in FIG. 8, the trimmer 1 according to the present embodiment can be used as the router 4 by removing the base 20 from the tool body 10 and attaching a router (plunge type) base 40 instead. The base 40 is provided with a pair of left and right grips 41. The user can perform relatively heavy cutting such as grooving by holding the left and right grips 41 with both hands and moving the router 4. In the router 4 of the present embodiment, the configuration of the tool body 10 is not changed, the intake port 5a is not blocked by the base 40, and the intake port 5a is not blocked by the user's hand. Therefore, in the router 4 of this embodiment, the same effect as the case where the base 20 is used can be obtained for the cooling effect of the electric motor 15 and the controller 33 by the outside air flowing in from the intake port 5a. In FIG. 8, the tool main body 10 is used as a reference in the front-rear and left-right directions.

  Various modifications can be made to the embodiment described above. For example, although the configuration in which the vertical wall portion 5b and the side wall portion 5c are provided for the three intake ports 5a on the left and right in total is exemplified, a part or all of the vertical wall portion 5b and the side wall portion 5c may be omitted. .

  Further, the shape and number of the intake ports 5a can be appropriately changed as long as the positional relationship in the vertical direction among the intake ports 5a, the electric motor 15, and the controller 33 in the above embodiment is satisfied.

  Further, in the trimmer 1 of the above-described embodiment, the standby switch 14a, the lock-on switch 14b, the brushless type electric motor 15, and the speed change dial 34 are cited as the electrical components related to the rotational drive of the output shaft 11. However, the electric component according to the present invention is not limited to this, and can be replaced with an alternative component. Moreover, although the trimmer 1 using the battery pack 16 as a power source has been illustrated, the present invention can be similarly applied to a wood-based portable cutting machine using a commercial 100V AC power source as a power source.

W ... Work material Qa ... Upward flow Qb ... Downward flow 1 ... Trimmer 4 ... Router 5 ... Housing 5R ... Right half part 5L ... Left half part 5A ... Cylindrical part, 5B ... Swelling part 5a ... intake port, 5b ... vertical wall part, 5c ... side wall part 6 ... cover case 7 ... battery mounting part 10 ... tool body 10d ... exhaust port 11 ... output shaft 12 ... tip blade 13 ... nut 14a ... standby switch 14b ... lock on Switch 15 ... Electric motor 15a ... Rotor, 15b ... Stator, 15c ... Sensor board 16 ... Battery pack 18, 19 ... Scale (for cutting depth display)
DESCRIPTION OF SYMBOLS 20 ... Base 21 ... Base part, 21a ... Inner peripheral hole 22 ... Main body support part 23 ... Holding part 24 ... Clamping device 24a ... Clamp lever 25 ... Adjustment dial 30, 31 ... Bearing 32 ... Blower fan 33 ... Controller 33a ... Left and right side , 33b ... front and rear side surfaces, 33c ... lower surface 34 ... transmission dial 40 ... base 41 ... gripping part

Claims (5)

A portable cutting machine for woodworking used for cutting and grooving of edges of workpieces such as wood,
An electric motor; a housing that houses the electric motor; a cutting tool that is rotated by a driving force of the electric motor; and a base that is brought into contact with the workpiece and protrudes downward. And
Above the electric motor, a controller that performs drive control of the electric motor is provided at a position overlapping the electric motor in plan view,
The woodworking portable cutting machine which provided the inlet of cooling air in the said housing below the said controller and the said electric motor about the up-down direction. A portable cutting machine for woodwork according to claim 1,
A wood cutting portable cutting machine configured to directly cool the electric motor by flowing a part of the outside air flowing in from the intake port and directly cooling the controller by flowing a part of the outside air. A portable cutting machine for woodwork according to claim 2,
The controller has a flat plate shape and is arranged in a posture in which a thickness direction thereof is an up-down direction, and guides air that is directed upward from the intake port to a plane formed between the shortest sides of the controller. Arranged portable cutting machine for woodworking. A portable cutting machine for woodwork according to any one of claims 1 to 3,
A woodworking portable cutting machine provided with a vertical wall portion that occupies half or more of the opening area of the air intake port on the back side of the air intake port. It is the portable cutting machine for woodwork described in any one of Claims 1-4,
A woodworking portable cutting machine in which an upper portion of the housing bulges in a radial direction, and the intake port is provided in a region bulged in a vertical direction of the housing.

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