JP6534543B2 - Cutting machine - Google Patents

Description

  The present invention relates to a stationary or bench type cutting machine that cuts a material to be cut by a rotary blade that is rotated by the cutting machine body by swinging the cutting machine body up and down.

  BACKGROUND Conventionally, there is known a cutting machine that cuts a material to be cut by rotating a circular cutting blade (hereinafter, referred to as a "rotating blade") such as a circular saw or a grindstone. Such cutting machines include stationary cutting machines that are used on the ground and tabletop cutting machines that are used on a desktop. Such a cutting machine incorporates a motor as a drive source. The rotational drive force generated by the motor is transmitted to the output shaft via the reduction gear unit. A rotary blade is attached to the output shaft. The rotary blade rotates integrally with the output shaft so as to cut the material to be cut.

JP 2014-14909 A

  By the way, there are some electric tools that use a brushless motor as a drive source. The rotational drive of such a brushless motor is controlled by a controller equipped with an FET (Field Effect Transistor) or the like. Power is supplied to the windings of the brushless motor through the controller. The controller itself generates heat as well as the windings of the brushless motor. Therefore, even in the controller that controls the rotational drive of the brushless motor, it is required to cool the same as the windings of the brushless motor.

  On the other hand, in the above-mentioned cutting machine, chips are scattered from the material to be cut during cutting. Such swarf is often scattered from the material to be cut and flies in the air, and then falls by its own weight and often falls on the cutting machine. For this reason, in such a cutting machine, it is required to devise a device in which the swarf to be scattered falls.

  The present invention has been made in view of such circumstances, and the problem to be solved by the present invention is that in a stationary or table-top type cutting machine for cutting a material to be cut, the falling chips do not enter While maintaining good cooling of the controller that controls the rotational drive of the brushless motor.

  In order to solve the above-mentioned subject, the cutting machine concerning the present invention takes the following means. That is, the cutting machine according to the first aspect of the present invention is a stationary or table-top type cutting machine that cuts a material to be cut by rotating a rotary blade, comprising: a motor generating rotational driving force; and rotational driving of the motor A controller housing portion for controlling the controller, and a controller housing portion for housing the controller, the controller housing portion being provided with a vent opening portion capable of ventilating the inside and the outside of the controller housing portion, the vent opening portion The arrangement position of is set to face the controller and is set on the lower side of the controller.

  According to the cutting machine of the first aspect of the present invention, the controller housing portion is provided with the vent opening portion which can ventilate inside and outside of the controller housing portion. The arrangement position of the vent opening faces the controller, so that the outside air entering from the vent opening will immediately hit the controller. Moreover, the arrangement | positioning location of this ventilation opening part is set below the controller. That is, since the ventilation opening is directed downward, no chips will enter from the ventilation opening even if the chips fall on the cutting machine. Therefore, according to the cutting machine according to the first aspect of the present invention, the controller for controlling the rotational drive of the brushless motor can be favorably cooled while preventing the infiltration of the falling chips.

  A cutting machine according to a second aspect of the present invention is the cutting machine according to the first aspect, wherein the controller housing portion is set so that the dimension in the left-right direction is relatively long with respect to the dimension in the vertical direction. The configuration is Incidentally, the vertical direction is a direction substantially corresponding to the cutting and rocking direction of the cutting machine main body (the direction in which the rotary blade is rocked). Further, the left-right direction is a direction that coincides with the direction in which the output shaft for rotating the rotary blade extends (the direction in which the rotation axis of the rotary blade extends).

  According to the cutting machine of the second aspect of the invention, the controller housing portion is set such that the dimension in the left-right direction is relatively long with respect to the dimension in the vertical direction. The length can be reduced. By this, the bulkiness of the cutting machine main body in the vertical direction can be suppressed, and downsizing of the cutting machine can be achieved. The controller is formed in a flat plate block shape (flat plate shape having a thickness) obtained by molding a substrate on which a semiconductor chip is mounted. Further, in order to achieve such compactification, it is cited that the widest surface of the controller is supported by the controller housing portion so as to be parallel to the motor axial direction of the motor.

  A cutting machine according to a third aspect of the present invention is the cutting machine according to the second aspect, further comprising: an output shaft to which the rotary blade is attached, and a motor housing portion for mounting the motor therein, the controller housing The unit is configured to be protruded toward the motor housing unit with reference to the output shaft. The motor housing portion side is a so-called motor side which is the opposite side to the rotary blade arrangement side.

  According to the cutting machine of the third aspect of the invention, the controller housing portion is set so as to protrude toward the motor housing portion with reference to the output shaft. You can suppress the tension. As a result, it is possible to secure a visual recognition area on the side of the output shaft of the user, which makes it easy to carry out the work when cutting the material to be cut. The controller housed in the controller housing portion thus projected is disposed and set so as to overlap the motor shaft when viewed from above at the swinging bottom dead center of the cutting machine main body.

  A cutting machine according to a fourth invention is the cutting machine according to any one of the first to third inventions, wherein the controller is disposed on the upper side relative to the motor housing portion. , Is a configuration. Incidentally, the controller housing portion that accommodates the controller is also disposed on the upper side relative to the motor housing portion. According to the cutting machine according to the fourth aspect of the invention, the controller and the controller housing portion are disposed on the upper side relative to the motor housing portion, so that the upper side of the motor housing portion susceptible to dead space is effectively utilized. be able to. This makes it possible to make the entire cutting machine compact.

  A cutting machine according to a fifth aspect of the present invention is the cutting machine according to any of the first to fourth aspects, wherein the ventilation opening portion is an entire area of the controller in which the outside air entered from the ventilation opening portion is , And is disposed facing the upstream position of the entire surface of the controller. According to the cutting machine according to the fifth aspect of the present invention, the ventilation opening is provided facing the upstream position of the entire area of one surface of the controller, so the outside air entering from the ventilation opening passes through the whole area of the controller Flow. Thereby, the controller can be cooled by efficiently using the cooling air.

  A cutting machine according to a sixth aspect of the present invention is the cutting machine according to any of the first to fifth aspects, wherein the motor is a brushless motor, and the controller includes the brushless motor. A control processing device that controls both rotational driving and regenerative braking is included. According to the cutting machine according to the sixth aspect of the invention, the controller includes the control processing device for controlling both the rotational drive and the regenerative braking of the brushless motor. It can be carried out. By this, rotation of the rotary blade can be accurately performed, and a cutting machine with improved convenience can be obtained.

It is the whole side view which looked the cutting machine at the time of storage from the right side. It is the whole side view which looked the cutting machine at the time of use from the right side. It is the whole front view which looked the cutting machine of FIG. 1 from the front side. It is the whole top view which looked the cutting machine of FIG. 1 from the upper side. It is the whole side view which looked the cutting machine of FIG. 1 from the left side. It is a partially cutaway cross-sectional view which partially cuts and shows the cutting machine main body seen from the front side. It is a partially cutaway cross-sectional view which partially cuts and shows the cutting machine main body seen from the left side. FIG. 8 is a cross-sectional view taken along line (VIII)-(VIII) in FIG. 7; It is a block diagram which shows the drive system of a brushless motor typically.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the cutting machine which concerns on this invention is demonstrated, referring FIGS. 1-8. FIG. 1 is an overall side view of the cutting machine 10 during storage as viewed from the right. FIG. 2 is an overall side view of the cutting machine 10 in use as viewed from the right. FIG. 3 is an overall front view of the cutting machine 10 of FIG. 1 as viewed from the front side. FIG. 4 is an overall top view of the cutting machine 10 of FIG. 1 as viewed from above. FIG. 5 is an overall side view of the cutting machine 10 of FIG. 1 as viewed from the left side. FIG. 6 is a partially cutaway sectional view showing the cutting machine main body 20 partially cut away and viewed from the front side. In addition, the directions of top, bottom, front, back, left, and right defined in the drawing are directions set in view of the use situation of the user. Specifically, the vertical direction substantially coincides with the swinging direction of the rotary blade B, and the horizontal direction coincides with the rotation axis of the rotary blade B. Further, the front side of the cutting machine 10 is defined on the side where there is a user who uses the cutting machine 10.

  The illustrated cutting machine 10 is configured as a stationary cutting machine used on the ground. The cutting machine 10 rotates the rotary blade B to cut the material to be cut. The cutting machine 10 is a cutting machine using two rechargeable batteries 90 as a power source, and is a cutting machine using a brushless motor 62 as a driving source. As shown in FIGS. 1 and 2, the cutting machine 10 roughly includes a base 11 and a cutting machine body 20. The base 11 is a support placed on the ground. The upper surface of the base 11 is set as a table surface 12. A material to be cut by the cutting machine 10 is placed on the table surface 12. The table surface 12 is provided with a fence 13 for abuttingly supporting the mounted workpiece from the rear side. The fence 13 is fixed to the table surface 12 by a fixing member 14.

  The table surface 12 is provided with a vice plate 15 for supporting the loaded material to be cut from the front side. The vice plate 15 is fixed to the table surface 12 by a fixed handle 16. The vice plate 15 can be moved relative to the table surface 12 by unlocking the fixed handle 16. At the rear end portion of the table surface 12, a support connecting portion 17 for connecting and supporting the cutting machine main body 20 is provided. The support connection portion 17 is provided so as to protrude upward in the form of a bracket from the table surface 12. At the upper end portion of the support connection portion 17, a pivot shaft portion 18 rotatably supporting the cutting machine main body 20 is provided. The lower end of the rotation support portion 215 of the cutting machine main body 20 is connected to and supported by the rotation shaft portion 18.

  The cutting machine main body 20 can swing up and down with respect to the base 11 together with the rotation support portion 215 with the rotation shaft portion 18 as a rotation fulcrum. As will be described later, when the cutter main body 20 is moved downward, the rotary blade B strikes the workpiece placed on the table surface 12. Here, the rotating blade B that is rotating will hit to cut the material to be cut. In addition, as the rotary blade B, for example, a circular cutting stone is set. The cutting machine main body 20 has the motor unit 61 and the gear unit 71 that rotate the rotary blade B as described above. The cutting machine body 20 is supported by the base 11 so as to be able to swing up and down relative to the table surface 12.

  As shown in FIGS. 3 and 4, the cutting machine main body 20 generally has a handle portion 21, a motor portion 61, and a gear portion 71. The motor unit 61 is disposed on the left side relative to the handle unit 21. Further, the gear portion 71 is disposed on the right side relative to the handle portion 21. The front and rear positions of the motor portion 61 and the gear portion 71 are set at substantially intermediate positions before and after the handle portion 21. The handle portion 21, the motor portion 61, and the gear portion 71 form an integrated cutting machine main body 20 by screwing the respective housings 210, 610, 710 together.

  The handle portion 21 is configured to have a handle housing 210. The handle housing 210 is provided with two grips 23, 25 as shown in FIG. The first grip portion 23 is set on the front side relative to the motor portion 61. The first grip portion 23 is a portion which can be grasped by hand when the cutting machine main body 20 is rocked (cut up and down operation) up and down. Therefore, the first grip portion 23 is provided with the operation trigger 242 for performing the on / off operation of the cutting machine main body 20 together with the swinging operation of the cutting machine main body 20 up and down. The operation trigger 242 can be pulled after the operation button 241 is pressed. When the operation trigger 242 is pulled, a switch on signal is transmitted from the operation trigger 242 to the controller 50 described later.

  On the other hand, the second grip portion 25 is set on the upper side relative to the motor portion 61. The second grip portion 25 is a portion that can be grasped by hand when carrying the cutting machine 10 mainly. When carrying the cutting machine 10, the relative movement between the base 11 and the cutting machine body 20 is held by the retaining chain 29 so that the cutting machine body 20 does not swing relative to the base 11. That is, one end of the retaining chain 29 is attached to the base 11, and the other end is attached to the front end of the first grip portion 23.

  The handle housing 210 is provided with two battery mounting portions 34 to which two rechargeable batteries 90 are mounted. That is, the mounting base 31 is provided at the rear end 251 of the second grip portion 25. The mounting base 31 is set to face the rear end 251 of the second grip 25, and the left mounting part set in parallel with the right mounting part 341 next to the right of the right mounting part 341. And 342 are provided. The mounting base 31 is shaped so as to protrude leftward from the rear end 251 of the second grip portion 25 by the amount of the left mounting portion 342. In the mounting base 31, two battery mounting portions 341, 342 are provided in parallel in the left-right direction such that the mounting surface on which the rechargeable battery 90 is mounted is directed rearward. The same rechargeable battery 90 whose rated voltage is set to 18 V can be attached to these battery attachment parts 341 and 342 by sliding it from the top to the bottom.

  The lengths of the left and right ranges of the two rechargeable batteries 90 mounted to the battery mounting parts 341 and 342 arranged in parallel in this manner are within the lengths of the left and right ranges of the mounting base 31. Incidentally, the left end edge 312 of the mounting base 31 protrudes leftward relative to the left side surface 611 of the motor housing 610. Further, the right end edge 311 of the mounting base 31 is slightly protruded rightward from the right edge 253 of the second grip portion 25. For this reason, an appropriate space is provided between the right end edge 311 of the mounting base 31 and the blade case 75. The handle housing 210 is provided with a controller housing portion 41. The controller housing portion 41 will be described in detail after the following description of the motor portion 61 and the gear portion 71.

  The motor unit 61 is configured to have a motor housing 610 as shown in FIG. The motor housing 610 is screwed to the handle housing 210 on the left side of the handle housing 210. The motor housing 610 has a bottomed cylindrical outer shape. A brushless motor 62 is installed in an interior 615 of the motor housing 610. The brushless motor 62 is a drive source of the cutting machine main body 20, and is a motor that generates a rotational drive force. More specifically, the brushless motor 62 is a brushless DC motor, and is a three-phase motor having a U-phase, a V-phase, and a W-phase. The brushless motor 62 generally includes a motor shaft 63, a rotor 64, a winding 65, an insulator 66, and a sensor substrate 67. The motor shaft 63 is a rotation shaft of the rotor 64. The motor shaft 63 is disposed to extend laterally in the interior 615 of the motor housing 610.

  The motor shaft 63 is rotatably supported by bearings 631 and 632. Specifically, the left bearing 631 rotatably supports the left end of the motor shaft 63. The left bearing 631 is supported by the motor housing 610. The right bearing 632 rotatably supports the vicinity of the right end of the motor shaft 63. The right bearing 632 is supported by the gear housing 710. At the right end of the motor shaft 63, an input gear 633 formed in a spur gear is set. The input gear 633 rotates integrally with the motor shaft 63 and inputs rotational drive to the gear portion 71 (reduction gear 72). A cooling fan 35 described later is attached to an intermediate portion of the motor shaft 63.

  The rotor 64 is supported by a motor shaft 63 serving as a rotation shaft. The windings 65 and the insulator 66 are disposed around the rotor 64 and supported by the motor housing 610. The winding 65 generates a magnetic field by the flow of current. The winding 65 is set for each of the U phase, the V phase, and the W phase. The insulator 66 is electrically isolated from the winding 65. The sensor substrate 67 is supported by the motor housing 610. The sensor substrate 67 is disposed to face the left end of the rotor 64. The sensor substrate 67 is configured by using a Hall element, and performs detection regarding the rotation of the rotor 64. The sensor substrate 67 is electrically connected to a controller 50 described later, and transmits a position signal to the control processing device 51 of the controller 50 based on the rotation of the rotor 64.

  A cooling fan 35 is attached to the motor shaft 63. The cooling fan 35 is constituted by a centrifugal fan. A baffle plate 36 is provided around the cooling fan 35. The baffle plate 36 generates an air flow in the cooling fan 35 that rotates integrally with the motor shaft 63. Due to the shape of the baffle plate 36, the cooling fan 35 generates a flow that draws in from the left side of the cooling fan 35 in the drawing and discharges it to the right side in the drawing. The cooling air generated by the cooling fan 35 cools the brushless motor 62 and the controller 50. For this reason, the motor housing 610 is provided with a motor-side intake section 69, and a controller housing section 41 described later is provided with a wind window 47.

  The motor-side intake portion 69 is provided on the left side surface 611 of the motor housing 610 as shown in FIG. The motor-side intake unit 69 is set by providing a plurality of slit-shaped opening shapes that communicate the inside and outside of the motor housing 610. That is, the air flow generated by the rotation of the cooling fan 35 sucks the outside air from the motor-side intake unit 69. The drawn outside air passes from left to right with respect to the brushless motor 62 as the first cooling air, enters the cooling fan 35, and is then discharged toward the gear portion 71 described below. At this time, the first cooling air W 1 cools the brushless motor 62 including the winding 65 when passing through the brushless motor 62. The second cooling air W2 for cooling the controller 50 will be described in detail later.

  The gear portion 71 is configured to have a gear housing 710 as shown in FIG. The gear housing 710 is screwed to the handle housing 210 on the right of the handle housing 210. A reduction gear 72 and an output shaft 73 are provided inside the gear housing 710. The reduction gear 72 is integrated with an output shaft 73 serving as a rotation shaft. The reduction gear 72 is a spur gear that meshes with the input gear 633. Therefore, the rotational drive of the motor shaft 63 causes the output shaft 73 to rotate by being transmitted to the reduction gear 72 engaged from the input gear 633. The output shaft 73 is rotatably supported by bearings 731 and 732. Specifically, the left bearing 731 rotatably supports the left end of the output shaft 73. The left bearing 731 is supported by the gear housing 710. The right bearing 732 rotatably supports the vicinity of the right end of the output shaft 73. The right bearing 732 is supported by the bearing box 74.

  The right end of the output shaft 73 is exposed to the inside of the blade case 75. The rotary blade B is attached to the right end of the output shaft 73 via a flange-shaped fixing member. The blade case 75 is formed to cover the periphery of the rotary blade B. The blade case 75 is screwed and fixed to the gear housing 710. A movable cover 76 which is displaceable relative to the blade case 75 is attached to the blade case 75. When replacing the rotary blade B with respect to the output shaft 73, the fitting hole 783 provided in the reduction gear 72 against the biasing of the biasing spring 782 against the stopper 781 provided on the gear housing 710. To regulate the relative rotation of the output shaft 73 with respect to the gear housing 710. Such fixing of the output shaft 73 makes it possible to release and fasten the fixing of the flange-shaped fixing member described above.

  The controller unit 40 is provided below the second grip unit 25. FIG. 7 is a partially cutaway sectional view showing the cutting machine main body 20 partially cut away and viewed from the left side. FIG. 8 is a cross-sectional view taken along line (VIII)-(VIII) in FIG. As shown in FIGS. 7 and 8, the controller unit 40 is configured by housing the controller 50 in the controller housing unit 41. The controller 50 is formed in a shape having a thickness in the vertical direction while extending in the front-rear direction in a side view as shown in FIG. Further, as shown in FIG. 8, the controller 50 is formed in a shape having a spread to the left and right while extending forward and backward when viewed from above. That is, the controller 50 is formed in a flat plate block shape (flat plate shape having a thickness) obtained by molding the substrate on which the semiconductor chip is mounted. The controller 50 configures a drive system 500 shown in FIG. 9 between the brushless motor 62 and the rechargeable battery 90.

  FIG. 9 is a block diagram schematically showing a drive system 500 of the brushless motor 62. As shown in FIG. As shown in FIG. 9, the controller 50 has a control processing unit 51 and a bridge circuit unit 52, and controls the rotational drive of the brushless motor 62. The control processor 51 is configured to have a central processing unit (CPU) and an appropriate storage medium. The bridge circuit device 52 is configured as a switching circuit for driving the brushless motor 62. The control processing device 51 performs control for rotationally driving the brushless motor 62, and also performs control of regenerative braking for braking the rotation of the motor shaft 63. The bridge circuit device 52 is configured to include an FET (Field Effect Transistor) as a switching element. That is, the control processing device 51 controls the bridge circuit device 52 to rotationally drive and regeneratively brake the brushless motor 62. Incidentally, the control processing device 51 performs control processing based on the detection regarding the rotation of the rotor 64 by the sensor substrate 67. Further, battery information such as voltage and temperature of the rechargeable battery 90 is sent to the control processing unit 51. Further, motor information such as the temperature of the brushless motor 62 is sent to the control processing unit 51.

  By the way, the shape corresponding to the outer peripheral shape of the controller 50 is selected as the controller housing part 41. The controller housing portion 41 is set with an internal space 410 capable of accommodating the flat plate block type controller 50. That is, the controller housing portion 41 is integrally formed with the handle housing 210 so as to cover the outer periphery of the controller 50. The controller 50 is fixedly held by the controller housing portion 41 via the fixing member 43 in the internal space 410. Here, the controller 50 is supported by the controller housing portion 41 such that the widest lower surface 53 of the flat plate block type is parallel to the axial direction of the motor shaft 63 of the brushless motor 62.

  The arrangement location of the controller housing portion 41 is set as follows. That is, the controller housing portion 41 is set to be disposed between the second grip portion 25 and the motor housing 610. Specifically, in the upper and lower arrangement relationship shown in FIG. 7, the controller housing portion 41 is disposed at a position immediately below the second grip portion 25. Also, the controller housing portion 41 is disposed at a position directly above the motor housing 610. As described above, the controller 50 housed in the controller housing portion 41 is disposed on the upper side relative to the motor housing 610. In terms of the front and rear range of the controller housing portion 41, as shown in FIG. 7, the size of the front and rear range of the controller housing portion 41 is set to be within the front and rear range of the second grip portion 25.

  Further, regarding the left and right range of the controller housing portion 41, the right side edge 411 of the controller housing portion 41 is set to be substantially aligned with the right side edge 253 of the second grip portion 25 as shown in FIG. On the other hand, the left side edge 412 of the controller housing portion 41 is projected leftward from the left side edge 254 of the second grip portion 25 as shown in FIG. That is, the controller housing portion 41 is protruded to the brushless motor 62 side opposite to the arrangement side of the rotary blade B. That is, the controller housing portion 41 is provided so as to protrude toward the motor housing 610 with reference to the output shaft 73. Here, as shown in FIG. 6, the left side projecting length of the left side edge 412 with respect to the second grip portion 25 of the controller housing portion 41 is compared with the left side projecting length of the left side 611 with respect to the second grip portion 25 of the motor housing 610. The projection length is about half. Therefore, the left side edge 412 of the controller housing portion 41 is located on the right side of the left end edge 312 of the mounting base 31 and is located on the right side of the left side surface 611 of the motor housing 610.

  In the controller housing portion 41 formed in a substantially rectangular parallelepiped, relative dimensions in the upper, lower, front, rear, left, and right directions are set as follows. That is, the dimension in the left-right direction of the controller housing portion 41 is set to be relatively longer than the dimension in the vertical direction. Further, the dimension in the front-rear direction of the controller housing portion 41 is set to be relatively longer than the dimension in the left-right direction. Here, the internal space 410 of the controller housing portion 41 is in fluid communication with the interior 615 of the motor housing 610 via the communication opening 45. The communication opening 45 is set at the rear right side of the lower portion 415 of the controller housing portion 41 as shown in FIGS. 7 and 8. Specifically, the communication opening 45 is set at a position of the lower portion 415 of the controller housing portion 41 to face the right range rear end 55 of the accommodated controller 50. Here, the air in the internal space 410 of the controller housing portion 41 is drawn into the interior 615 of the motor housing 610 through the communication opening 45 by the air flow generated by the cooling fan 35.

  On the other hand, at the lower portion 415 of the controller housing portion 41, a wind window 47 capable of ventilating the inside and the outside of the controller housing portion 41 is provided. That is, the wind window 47 is provided in the lower portion 415 of the controller housing portion 41 so that the outside air outside the controller housing portion 41 can be sucked into the internal space 410 of the controller housing portion 41. The wind window 47 is set at the front left portion of the lower portion 415 of the controller housing portion 41 as shown in FIGS. 7 and 8. Specifically, the wind window 47 is set in the lower portion 415 of the controller housing portion 41 so as to face the left range front end 57 of the housed controller 50. The wind window 47 is provided such that four slit-shaped through holes are arranged in front and rear. The four slits of the wind window 47 are formed so as to be slightly cut from the left edge 412 of the lower portion 415 of the controller housing portion 41 to the right of the lower portion 415 of the controller housing portion 41. The wind window 47 corresponds to the ventilation opening according to the present invention.

  Here, since the internal space 410 of the controller housing portion 41 described above is sucked into the interior 615 of the motor housing 610 through the communication opening 45, the external portion of the controller housing portion 41 can be seen from the air window 47 described above. The outside air is to be sucked. For this reason, the wind window 47 is a starting point of the air flow flowing in the internal space 410 of the controller housing portion 41. That is, the wind window 47 is provided facing the upstream position (the left side front end 57) of the entire surface of the controller 50 so that the outside air entered from the wind window 47 flows through the entire surface of the lower surface 53 of the controller 50. There is. That is, the outside air entering from the air window 47 flows into the internal space 410 of the controller housing portion 41 as the second cooling air W2 for cooling the controller 50 while contacting the lower surface 53 of the controller 50.

  According to the above-described cutting machine 10, the following effects can be achieved. That is, the controller housing portion 41 is provided with a wind window 47 which can ventilate inside and outside of the controller housing portion 41. Since the arrangement position of the wind window 47 faces the controller 50, the outside air entering from the wind window 47 will immediately hit the controller 50. Further, the position where the wind window 47 is provided is set below the controller 50. That is, since the wind window 47 is directed downward, the chips do not enter through the wind window 47 even if the chips fall on the cutter 10. Therefore, according to this cutting machine 10, the controller 50 for controlling the rotational drive of the brushless motor 62 can be well cooled while preventing the intrusion of chips coming down.

  Further, according to the above-described cutting machine 10, the controller housing portion 41 is set such that the dimension in the left-right direction is relatively long with respect to the dimension in the vertical direction. The length can be reduced. By this, the bulkiness of the cutting machine 10 main body in the vertical direction can be suppressed, and the downsizing of the cutting machine 10 can be achieved. Further, in order to achieve such compactness, the widest lower surface 53 of the controller 50 is parallel to the axial direction of the motor shaft 63 of the brushless motor 62.

  Further, according to the cutting machine 10 described above, since the controller housing portion 41 is set to protrude toward the motor housing 610 with reference to the output shaft 73, the controller housing portion 41 is directed to the output shaft 73 side of the controller housing portion 41. Can reduce the bulk of the As a result, it is possible to secure a visual recognition area on the side of the output shaft 73 of the user, which makes it easy to carry out the work when cutting the material to be cut. The controller 50 housed in the controller housing portion 41 thus protruded is disposed and set so as to overlap the motor shaft 63 when viewed from above at the swinging bottom dead center of the cutting machine 10 main body. Further, according to the above-described cutting machine 10, since the controller 50 and the controller housing portion 41 are disposed on the upper side relative to the motor housing 610, the upper side of the motor housing 610 that easily becomes a dead space is effectively utilized. be able to. As a result, the cutting machine 10 can be made compact as a whole.

  Further, according to the cutting machine 10 described above, since the wind window 47 is provided facing the upstream position (the left side front end 57) of the entire area of the lower surface 53 of the controller 50, the outside air entering through the wind window 47 is the controller 50. Flow through the entire area of the As a result, the controller 50 can be cooled by efficiently using the second cooling air W2. Further, according to the above-described cutting machine 10, since the controller 50 includes the control processing device 51 that controls both the rotational drive and the regenerative braking of the brushless motor 62, the controller 50 relates to the driving and braking related to the rotation of the brushless motor 62. Control can be performed. In particular, when the control processing device 51 controls the bridge circuit device 52 so as to regeneratively brake the brushless motor 62 after stopping the pulling operation of the operation trigger 242, the rotation of the rotary blade B may be rapidly stopped. The convenience as the cutting machine 10 is enhanced.

  In the above embodiment, various modifications may be made. In particular, in the above-described embodiment, the stationary type cutting machine 10 placed on the ground and used as an example of the cutting machine according to the present invention has been described by way of example. However, the cutting machine according to the present invention is not limited to this, and may be constituted by a table-top type cutting machine used by being placed on a table. Even when the cutting machine according to the present invention is implemented by such a desk-type cutting machine, the details of the cutting machine 10 according to the embodiment described above are appropriately modified. There is no change.

DESCRIPTION OF SYMBOLS 10 Cutting machine 11 Base 12 Table surface 13 Fence 14 Fixing member 15 Vice plate 16 Fixing handle 17 Support connecting part 18 Rotating shaft 20 Cutting machine main body 21 Handle part 210 Handle housing 215 Rotating support part 23 1st grip part 24 Operation Trigger 241 Operation button 242 Operation trigger 25 Second grip portion 251 Rear end of second grip portion 253 Right edge of second grip portion 254 Left edge of second grip portion 29 Fastening chain 31 Mounting base 311 Mounting base right end edge 312 Mounting Base left edge 34 Battery mounting portion 341 Right mounting portion 342 Left mounting portion 35 Cooling fan 36 Baffle plate 40 Controller portion 41 Controller housing portion 410 Internal space 411 Right side edge 415 Left edge 415 Lower portion 43 Fixing member 45 Communication opening 47 Wind window Vent opening)
DESCRIPTION OF SYMBOLS 50 controller 500 drive system 51 control processing apparatus 52 bridge circuit apparatus 53 lower surface 55 right side range rear end 57 left side range front end 61 motor part 610 motor housing 611 left side 615 inside 62 brushless motor 63 motor shaft 631 left bearing 633 right bearing 633 Input gear 64 Rotor 65 Winding 66 Insulator 67 Sensor board 69 Motor side intake part 71 Gear part 710 Gear housing 72 Reduction gear 73 Output shaft 731 Left bearing 732 Right bearing 74 Bearing box 75 Blade case 76 Movable cover 781 Stopper 782 Bias Spring 783 Fitting hole 90 Rechargeable battery B Rotary blade tool W1 first cooling air W2 second cooling air

Claims (4)

A table for placing a material to be cut, and a cutting machine main body supported swingably in the vertical direction with respect to the table, and the cutting machine main body below the material to be cut placed on the table A stationary cutting machine for cutting a material to be cut by a rotary blade which is rotated by the cutting machine main body by rocking the cutting machine body,
The cutting machine body includes a first grip portion for gripping when swung, and a second grip portion for gripping when carrying of the stationary cutting machine, a brushless motor for generating a rotational driving force, the rotational driving of the brushless motor And a controller including a control processing unit that controls both the braking and the regenerative braking ,
The first grip portion is disposed on the front side of the brushless motor, and the second grip portion is disposed on the upper side of the brushless motor.
The controller is accommodated in a controller housing portion provided in an area relatively upper than the brushless motor and lower than a holding space of the second grip portion ,
A ventilation opening for drawing outside air into the internal space of the controller housing is provided on the side opposite to the rotary blade of the controller housing, and the controller housing communicates with the motor housing that houses the brushless motor. A communication opening which is provided on the upstream side of the cooling fan of the brushless motor ,
The second cooling air, which has cooled the inside of the controller housing portion through the vent opening portion, communicates with the first cooling air, which flows into the motor housing portion through the intake portion provided on the opposite side of the rotary blade of the motor housing portion. A stationary cutting machine configured to be merged and exhausted through an opening . A stationary cutting machine according to claim 1, wherein
A stationary cutting machine , wherein the vent opening location is facing the controller. In the stationary cutting machine according to claim 2,
The stationary cutting machine is provided so as to face the upstream position of the entire surface of the controller so that the outside air entering from the ventilation opening flows through the entire surface of the controller. . In the stationary cutting machine according to claim 2 or 3,
And an output shaft to which the rotary blade is attached,
The stationary cutting machine , wherein the controller housing portion is set to project along the output shaft on the same side as the motor housing portion.

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