JPWO2015029760A1 - Reciprocating tool - Google Patents

Abstract

Provided is a jigsaw that can be made compact by reducing the length of the housing in the direction along the axis of the output shaft. A plunger (22) provided in the housing (3) and supporting the saw blade (21) so as to be able to reciprocate, and provided in the housing (3), the output shaft (4) is switched between forward rotation and reverse rotation. And a motor (2) for reciprocating the plunger (22), the jigsaw (1) being provided in the housing (3) and capable of reciprocating in the direction in which the plunger (22) reciprocates. A weight (24) provided on the first shaft, a first motion converter (A1) that converts the rotational force of the output shaft (4) into a reciprocating force of the plunger (22), and the rotational force of the output shaft (4). A second motion converter (A2) that converts the weight (24) into a reciprocating force of the weight (24).

Description

  The present invention relates to a reciprocating tool, and more particularly to a technique for reducing vibration of a reciprocating tool such as a jigsaw.

  As a reciprocating tool, for example, a jigsaw as described in Patent Document 1 is known. Such a conventional reciprocating tool includes a drive unit having an output shaft, a tip tool for cutting an object, a motion converting unit for converting the rotational force of the output shaft into a reciprocating force of the tip tool, and a drive unit. And a main body provided with a motion conversion unit. The drive unit is a motor. The motion conversion unit includes a gear as a rotating element to which the rotational force of the output shaft is transmitted, a cylindrical connecting piece provided on a side surface of the gear that is eccentric from the axis that is the rotation center of the gear, and a tip And an operating part that supports the tool. The operating part has a plunger, and the plunger is provided with a rail part. The connecting piece is movably engaged with the rail portion.

  When the gear rotates with the rotational force of the output shaft, the connecting piece revolves around the axis. The connecting piece moves along the rail portion, and the rotational force of the connecting piece is converted into the reciprocating force of the plunger. Therefore, the vibration of the main body is generated by the reciprocating force of the plunger.

  In order to suppress or reduce the vibration of the main body, a vibration reduction mechanism is provided. The vibration reduction mechanism includes a cam provided on the back surface portion of the gear and a weight that operates together with the cam. The cam is provided eccentric to the axis. When the cam revolves with the rotational force of the gear, the weight operates in the opposite phase to the plunger, so that the weight vibration and the plunger vibration are canceled out, and the vibration of the main body is reduced.

JP 2007-62052 A

  However, in the reciprocating tool described in Patent Document 1, a weight and a plunger are arranged in a direction along the axis with a gear interposed therebetween. The distance from the center of gravity of the reciprocating tool to the weight is different from the distance from the center of gravity of the reciprocating tool to the plunger. For this reason, the vibration of the main body cannot be reduced unless the weight of the weight is increased. As a result, there is a problem that the length of the main body increases in the direction along the axis, and the size of the reciprocating tool is increased.

  An object of the present invention is to provide a reciprocating tool capable of reducing the length of a main body in a direction along the axis of a rotating element and making the main body compact.

  The reciprocating tool of the present invention is provided in the main body and is provided in the main body and supports the tip tool so as to be capable of reciprocating, and the output shaft of the rotating element is switched between forward rotation and reverse rotation. A reciprocating tool including a drive unit that reciprocates the operating unit, the weight provided in the main body and capable of reciprocating in the direction in which the operating unit reciprocates, and the main body And a first motion conversion unit that converts a rotational force of the output shaft of the drive unit into a reciprocating force of the operating unit, and a rotational force of the output shaft that is provided in the main body. A second motion conversion unit that converts the weight into a reciprocating force of the weight and suppresses vibrations generated by the reciprocating operation of the operating unit.

  According to the present invention, the reciprocating tool can be made compact by reducing the length of the main body in the direction along the axis of the output shaft.

It is a partial cross section side view which shows an example of the reciprocating tool which is 1st Embodiment of this invention. (A) is explanatory drawing which shows the plunger of the top dead center position in the AA cross section of FIG. 1, (b) is explanatory drawing which shows the counterweight of the bottom dead center position in the BB cross section of FIG. . (A) is explanatory drawing which shows the plunger of the intermediate position in the AA line cross section of FIG. 1, (b) is explanatory drawing which shows the counterweight of the intermediate position in the BB line cross section of FIG. (A) is explanatory drawing which shows the plunger of the bottom dead center position in the AA cross section of FIG. 1, (b) is explanatory drawing which shows the counterweight of the top dead center position in the BB cross section of FIG. . It is a figure which shows the control circuit which connected the reciprocating tool of this invention to AC power supply. It is a flowchart which shows the example of control of the reciprocating tool which is 1st Embodiment of this invention. It is a time chart which shows an example of the relationship of the position of the plunger in the control of a reciprocating tool, the motor rotation speed, the signal of a position sensor, an electric current value, a Duty command value, and a drive signal. It is sectional drawing which shows the modification of the reciprocating tool which concerns on this invention. (A) is an enlarged view of the plunger shown in FIG. 8, (b) is an enlarged view of the weight shown in FIG. It is a partial cross section side view which shows an example of the reciprocating tool which is 2nd Embodiment of this invention. It is a perspective view of the cam used for the reciprocating tool shown in FIG. (A) is explanatory drawing which shows the plunger of the top dead center position in the CC sectional view of FIG. 10, (b) is explanatory drawing which shows the weight of the bottom dead center position in the DD sectional view of FIG. (A) is explanatory drawing which shows the plunger of the intermediate position in the CC sectional view of FIG. 10, (b) is explanatory drawing which shows the weight of the intermediate position in the DD sectional view of FIG. (A) is explanatory drawing which shows the plunger of the bottom dead center position in the CC sectional view of FIG. 10, (b) is explanatory drawing which shows the weight of the top dead center position in the DD sectional view of FIG. It is a flowchart which shows the example of control of the reciprocating tool which is 2nd Embodiment of this invention. It is a figure which shows the control circuit which connected the reciprocating tool of this invention to DC power supply.

  Hereinafter, embodiments of a reciprocating tool of the present invention will be described in detail with reference to the drawings.

(First embodiment)
1st Embodiment of the reciprocating tool of this invention is described with reference to FIGS. As shown in FIG. 1, the jigsaw 1 which is 1st Embodiment has the housing 3 as a main body. The housing 3 includes a first housing portion 63, a second housing portion 64 connected to the first housing portion 63, and a handle portion 5 that connects the first housing portion 63 and the second housing portion 64. Yes. The motor 2 is provided in the first housing part 63. A power cable 73 is attached to the end of the first housing part 63. The power cable 73 supplies current to the motor 2. The motor 2 includes a stator 60 fixed in the first housing portion 63 and a rotor 61 that is rotatably provided in the first housing portion 63. The stator 60 includes a coil 47B corresponding to the U phase, a coil 47C corresponding to the V phase, and a coil 47A corresponding to the W phase.

  The rotor 61 includes the output shaft 4, a core 62 fixed to the output shaft 4, and a permanent magnet 70 attached to the core 62. The permanent magnet 70 has N and S poles with different polarities, and the permanent magnets 70 with different polarities are alternately arranged in the circumferential direction of the output shaft 4. In the example of FIG. 5, four permanent magnets 70 are arranged. When a voltage is applied to the coils 47A, 47B, 47C, a rotating magnetic field is formed by the permanent magnet 70, and the rotor 61 rotates. The motor 2 is a brushless motor without a brush that passes current through the coils 47A, 47B, and 47C.

  The handle part 5 is for the operator to operate the jigsaw 1 with his / her hand. The handle 5 is provided with a trigger 6 for switching the rotation or stop of the motor 2. In addition, a trigger switch 7 that is switched on and off by operating the trigger 6 is provided in the handle portion 5.

  A base portion 9 that is pressed against the upper surface of the work material 80 is attached to the outside of the second housing portion 64. When the operator presses the base portion 9 against the surface of the work material 80, the housing 3 is fixed to the work material 80.

  In the housing 3, a rear support plate 11 is provided between the first housing portion 63 and the handle portion 5. In the housing 3, the front support plate 13 is provided between the first housing portion 63 and the second housing portion 64. The first end of the output shaft 4 is rotatably supported by the rear support plate 11 via the rear bearing 10. The second end portion of the output shaft 4 is rotatably supported by the front support plate 13 via the front bearing 12. The output shaft 4 is rotatable around the center line X1. The direction along the center line X1 is the front-rear direction of the housing 3.

  A shaft hole is provided in the front support plate 13, and the second end portion of the output shaft 4 is disposed in the second housing portion 64 through the shaft hole. A drive gear 18 is provided on the outer peripheral surface of the output shaft 4 at a location arranged in the second housing portion 64. Further, a support shaft 17 fixed to the front support plate 13 is provided. The support shaft 17 is disposed around the axis line Y1. The axis Y1 is parallel to the center line X1. The support shaft 17 protrudes from the front support plate 13 into the second housing portion 64.

  A driven gear 19 is provided in the second housing portion 64, and the driven gear 19 is attached to the support shaft 17 via a bearing 20 so as to be rotatable. The driven gear 19 is in mesh with the drive gear 18. Here, the gear ratio is set so that the rotational speed of the driven gear 19 is lower than the rotational speed of the drive gear 18 when the rotational force of the motor 2 is transmitted to the driven gear 19. That is, the drive gear 18 and the driven gear 19 are speed reduction mechanisms. A pinion 23 that rotates integrally with the driven gear 19 is also provided. The pinion 23 is rotatably supported by the bearing 20. That is, the pinion 23 can rotate around the axis Y1.

  In addition, the plunger 22 is provided in the second housing portion 64, and the saw blade 21 is attached to the plunger 22. A blade holder is rotatably attached to the lower end portion of the plunger 22 via a pin 25. A saw blade 21 is detachably attached to the blade holder. The saw blade 21 is a tip tool for cutting the work material 80. The plunger 22 is disposed at a distance from the driven gear 19 in the direction along the axis Y1. As shown in FIG. 2A, a pair of upper and lower guide sleeves 28 are provided in the second housing portion 64, and the plunger 22 is moved vertically by the pair of guide sleeves 28, that is, along the axis Z1. It is supported movably. The plunger 22 is made of a metal plate that is long in the vertical direction, which is the direction of reciprocation.

  The plunger 22 has a first long hole 26 along the longitudinal direction, and a pinion 23 is disposed in the first long hole 26. Inner edges 26a and 26b parallel to each other are formed on the inner surface of the first long hole 26, and a first rack portion 27 is provided on the inner edge 26b. The pinion 23 meshes with the first rack portion 27. The plunger 22 can reciprocate in the direction along the axis Z <b> 1 with the first rack portion 27 meshing with the pinion 23.

  As shown in FIG. 1, an opening 29 that connects the inside and outside of the second housing portion 64 is provided, and a gear cover 30 that covers the opening 29 is detachably provided to the second housing portion 64. A plunger holder 31 is attached to the gear cover 30. The pair of guide sleeves 28 are provided on the plunger holder 31. Further, an elastic member that presses the plunger holder 31 in the direction along the axis Y1 is provided. The plunger holder 31 can swing around the upper end in FIG.

  The pinion 23 and the plunger 22 are the first motion converter A1. The first motion conversion unit A1 is a mechanism that converts the rotational force of the driven gear 19 into the reciprocating force of the saw blade 21. The first motion conversion unit A1 is disposed in the second storage unit 64.

  A second motion converter A <b> 2 is provided in the second housing part 64. The second motion conversion unit A2 is a mechanism for suppressing vibrations generated by the reciprocating motion of the plunger 22. The second motion conversion unit A <b> 2 includes a pinion 23 and a weight 24. The second motion converter A <b> 2 converts the rotational force of the driven gear 19 into the reciprocating force of the weight 24.

  The weight 24 is disposed between the driven gear 19 and the plunger 22 in the direction along the axis Y1. As shown in FIG. 2B, the weight 24 is made of a metal plate that is long in the vertical direction, which is the direction of reciprocation. The weight 24 has a second long hole 39 along the longitudinal direction, and the pinion 23 is disposed in the second long hole 39. Further, two inner edges 39a and 39b parallel to each other are formed on the inner surface of the second elongated hole 39, and a second rack portion 40 is provided on the inner edge 39b. The second rack portion 40 meshes with the pinion 23.

  A total of four guide pins 41 are arranged in the second housing part 64, that is, a pair of left and right and two pairs of upper and lower. The guide pins 41 are provided on the front support plate 13 shown in FIG. The weight 24 is supported by four guide pins 41 so as to be movable in the vertical direction. The weight 24 can reciprocate in the vertical direction in a state where the pinion 23 and the second rack portion 40 are engaged with each other.

  Further, as shown in FIG. 1, the plunger 22 and the weight 24 are arranged so as not to contact each other. A fan 42 is disposed between the stator 60 and the front support plate 13. The fan 42 rotates with the output shaft 4 to cool the motor 2. The air flow formed by the fan 42 serves to remove the chips of the work material 80 from the work material 80.

  Further, in order to improve the cutting efficiency due to the operation of the saw blade 21, an orbital mechanism is provided that causes the tip of the saw blade 21 to elliptically move in the front-rear direction. The orbital mechanism includes an orbital cam 34, an intermediate member 35, and a roller holder 37. The orbital cam 34 is attached to the driven gear 19 eccentrically from the axis Y1. The intermediate member 35 is a plate material, and a hole is provided through the intermediate member 35 in the thickness direction. The orbital cam 34 is movably provided in the hole. When the orbital cam 34 revolves together with the driven gear 19, the intermediate member 35 reciprocates in the vertical direction.

  The roller holder 37 can swing about a shaft 38 as a fulcrum, and the roller 36 is attached to the roller holder 37. The roller 36 is in contact with the back surface of the saw blade 21. The force of the elastic member that pushes the plunger holder 31 is transmitted to the roller 36 via the plunger 22 and the saw blade 21. That is, the roller holder 37 is urged clockwise around the shaft 38 in FIG.

  Next, the control circuit of the jigsaw 1 will be described with reference to FIG. An AC power supply 39B that supplies power to the motor 2 is provided, and an inverter circuit 66 is provided between the AC power supply 39B and the motor 2. The inverter circuit 66 is controlled by a drive signal output from the control unit 16. The power cable 73 is connected to the AC power supply 39B, and a rectifier 420 that converts the current of the AC power supply 39B into DC is provided.

  A voltage detection unit 44 that detects the voltage of the electric circuit 67 between the AC power supply 39 </ b> B and the motor 2 via the capacitor 43 is provided. A current detection unit 46 that detects the current of the electric circuit 67 via the resistor 45 is provided. The signal output from the current detection unit 46, the signal output from the trigger switch 7, and the signal output from the voltage detection unit 44 are input to the control unit 16. The control unit 16 determines the load of the motor 2 based on the detected current.

  The inverter circuit 66 includes six transistors 48A to 48F. A control board 15 is provided in the first housing portion 63, and six transistors 48 </ b> A to 48 </ b> F are attached to the control board 15. The inverter circuit 66 is a three-phase full-bridge inverter circuit, the two transistors 48A and 48B are connected in series with each other, the two transistors 48C and 48D are connected in series with each other, and the two transistors 48E and 48F are They are connected in series with each other.

  The two transistors 48A and 48B are connected in parallel to the coil 47A. The two transistors 48C and 48D are connected in parallel to the coil 47C. The two transistors 48E and 48F are connected in parallel to the coil 47B. Furthermore, the coils 47A, 47B, and 47C are connected to each other.

  And the control part 16 controls the electric current value supplied to the coils 47A, 47B, and 47C, and switches the direction of electric current by controlling the timing which turns on / off each transistor 48A-48F, and the ratio to turn on. Can do. The control unit 16 outputs a PWM (pulse width modulation) signal in order to control the inverter circuit 66. The PWM signal is a signal that modulates the width of the pulse waveform when the current value supplied to the coils 47A, 47B, and 47C is represented by the pulse waveform. The pulse waveform represents on / off of each of the transistors 48A to 48F, and the ratio of turning on each of the transistors 48A to 48F is the duty ratio. The control unit 16 can arbitrarily change the duty ratio of each of the transistors 48A to 48F.

  In addition, a Hall IC 68 is provided on the control board 15. Three Hall ICs 68 are provided corresponding to the U phase, the V phase, and the W phase. The Hall IC 68 is a magnetic sensor that detects the magnitude of the magnetic field formed by the permanent magnet 70 and outputs a signal based on the detection result. A signal output from the Hall IC 68 is input to the rotational position detector 49. The rotational position detector 49 processes a signal input from the Hall IC 68 and detects the position of the rotor 61 in the rotational direction. Specifically, the position of the permanent magnet 70 with respect to the coils 47A, 47B, and 47C is detected. A signal output from the rotational position detection unit 49 is input to the control unit 16.

  Further, a signal output unit 69 that outputs a signal by the rotation of the output shaft 4 is provided. The signal output from the signal output unit 69 is input to the rotation angle detection unit 500. The rotation angle detection unit 500 detects the rotation angle of the output shaft 4 based on the input signal. The signal output unit 69 and the rotation angle detection unit 500 can be configured with a rotary encoder.

  Further, a position sensor 510 that detects an operation position of the plunger 22, for example, a top dead center of the plunger 22 is provided. The position sensor 510 is provided on the inner surface of the gear cover 30 as shown in FIG. The position sensor 510 may be provided on the inner surface of the second housing portion 64. On the other hand, a magnet 520 is attached to the upper end of the plunger 22. The position sensor 510 detects the magnetic field formed by the magnet 520, detects the top dead center of the plunger 22, and outputs a signal corresponding to the detection result.

  A signal output from the position sensor 510 is input to the control unit 16. As the position sensor 510, a distance sensor such as an infrared sensor can be used in addition to a method of detecting the magnet 520. The control unit 16 processes the signal from the rotation position detection unit 49 and the signal from the rotation angle detection unit 500 to detect the position of the plunger 22 and the position of the saw blade 21. The top dead center of the plunger 22 is also the top dead center of the saw blade 21.

  Next, the operation of the jigsaw 1 having the above configuration will be described. When the handle 5 of the jigsaw 1 shown in FIG. 1 is grasped by hand, the base 9 of the jigsaw 1 is placed on the upper surface of the work material 80, and the trigger 6 is pulled with a finger, the current of the AC power supply 39B is It is supplied to the stator 60 via the circuit 66. Here, by individually switching on and off the transistors 48A to 48F of the inverter circuit 66, the direction of the current flowing through the coils 47A, 47B, and 47C is switched, and the operation in which the rotor 61 rotates forward and backward is alternately repeated. The rotational force of the output shaft 4 is transmitted to the pinion 23 via the drive gear 18 and the driven gear 19, and the operation of the pinion 23 rotating forward and reverse is alternately repeated.

  In the first embodiment, in FIG. 2A, the direction in which the drive gear 18 rotates counterclockwise is referred to as the forward rotation of the motor 2, and the direction in which the drive gear 18 rotates clockwise is the reverse of the motor 2. Called rotation. When the motor 2 rotates forward, the pinion 23 rotates clockwise in FIG. 2A, and the plunger 22 rises. On the other hand, when the motor 2 reversely rotates, the pinion 23 rotates counterclockwise in FIG. 2A, and the plunger 22 descends.

  The output shaft 4 of the motor 2 does not rotate 360 degrees, and the rotation angle of the output shaft 4 is such that the plunger 22 reciprocates between a predetermined range, that is, between top dead center and bottom dead center. Is controlled. Basically, the rotation angle of the output shaft 4 is controlled with reference to the position in the rotation direction of the output shaft 4 corresponding to the top dead center of the plunger 22.

  In this way, the output shaft 4 of the motor 2 is rotated forward and backward, and the plunger 22 and the saw blade 21 reciprocate in the vertical direction.

  Further, the orbital cam 34 revolves forward and backward around the axis Y1 integrally with the driven gear 19. Then, the intermediate member 35 reciprocates in the vertical direction, and the roller holder 37 swings about the shaft 38 as a fulcrum. For this reason, when the saw blade 21 rises, it is pressed against the work material 80 against the force of the elastic member, and the saw blade 21 cuts the work material 80. On the other hand, when the saw blade 21 is lowered, the saw blade 21 is separated from the work material 80 by the force of the elastic member. By operating the saw blade 21 in this manner, the work material 80 can be cut or cut efficiently.

  That is, when the saw blade 21 is lowered, the saw blade 21 is separated from the work material 80, so that chips are easily discharged, and unnecessary friction between the saw blade 21 and the work material 80 is eliminated. It becomes possible to improve machinability.

  In addition, vibration of the housing 3 occurs due to the reciprocating motion of the plunger 22 and the saw blade 21. In the jigsaw 1 of the first embodiment, the weight 24 moves in the up-down direction in the direction opposite to the plunger 22. For this reason, the vibration generated by the reciprocating motion of the plunger 22 and the vibration due to the reciprocating motion of the weight 24 cancel each other, and the vibration of the housing 3 can be suppressed. That is, the vibration in the reciprocating direction of the plunger 22 can be reduced, and the generation of rotational moment caused by the displacement of the plunger 22 and the weight 24 can be reduced.

  For example, when the plunger 22 moves upward as shown in FIG. 2 (a), the weight 24 moves downward as shown in FIG. 2 (b). Further, when the plunger 22 moves to the intermediate position in the operation direction as shown in FIG. 3A, the weight 24 moves to the intermediate position in the operation direction as shown in FIG. 3B. Further, when the plunger 22 moves downward as shown in FIG. 4A, the weight 24 moves upward as shown in FIG. 4B. By repeating the reciprocating motion of the weight 24 in this way, it is possible to reduce or suppress the vibration of the housing 3 that repeatedly occurs at the top dead center and the bottom dead center of the plunger 22.

  Further, the plunger 22 and the weight 24 are made of a plate-like member, and the weight 24 is arranged next to the plunger 22 in the direction along the axis Y1. For this reason, the length in the front-rear direction of the housing 3 of the jigsaw 1, that is, the length in the direction along the axis Y1 can be reduced. Therefore, the jigsaw 1 can be made compact.

  Furthermore, the plunger 22 has a first long hole 26 along the up-down direction that reciprocates. In addition, a pinion 23 is disposed in the first long hole 26, and a first rack portion 27 that meshes with the pinion 23 is provided on the inner surface of the first long hole 26. For this reason, the rotational force of the output shaft 4 of the motor 2 can be directly transmitted to the saw blade 21 via the plunger 22 so that the saw blade 21 can reciprocate.

  And the weight 24 has the 2nd long hole 39 along the up-down direction which reciprocates. In addition, the pinion 23 is disposed in the second long hole 39, and a second rack portion 40 that meshes with the pinion 23 is provided on the inner surface of the second long hole 39. For this reason, the reciprocating motion in the direction opposite to the reciprocating motion of the plunger 22 can be easily imparted to the weight 24, and the vibration generated in the jigsaw 1 can be effectively suppressed.

  The weight 24 is a plate material arranged along a plane direction intersecting the center line X1 of the output shaft 4. Furthermore, the thickness of the weight 24 in the axis Y1 direction is equal to or less than the thickness of the plunger 22 in the axis Y1 direction. Therefore, the length of the housing 3 in the direction of the axis Y1 can be further reduced, and the jigsaw 1 can be made compact. Therefore, the jigsaw 1 that is compact and easy to use can be provided.

  Further, the motor 2 is a brushless motor in which the output shaft 4 is switched between forward rotation and reverse rotation by electronic control. This eliminates the need for a switching device that switches the rotation direction of the driven gear 19 forward and backward with respect to the rotation direction of the output shaft 4. Therefore, the jigsaw 1 can be further downsized.

  According to the jigsaw 1 of the present embodiment having the above configuration, the length of the housing 3 as the main body in the direction along the axis Y1 can be reduced, and the housing 3 can be made compact.

  Next, control examples that can be executed by the control unit 16 provided in the jigsaw 1 of the first embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is a flowchart illustrating a control example executed by the control unit 16. FIG. 7 is a diagram showing the relationship among the position of the plunger 22, the number of rotations of the motor 2, the signal of the position sensor 510, the current value supplied to the coils 47A, 47B, and 47C, the command value of the duty ratio, and the drive signal. It is. H in the signal of the position sensor 510 means that the plunger 22 is at the top dead center. Further, L in the signal of the position sensor 510 means that the plunger 22 is at the bottom dead center. The bottom dead center of the plunger 22 is estimated by the control unit 16 based on the signal from the position sensor 510 and the rotation angle of the output shaft 4.

  The control unit 16 estimates the load of the motor 2 based on the current value of the electric circuit 67. The control unit 16 can classify the load of the motor 2 into a plurality of stages, for example, four stages. The control unit 16 stores four types of threshold values 1 to 4 in order to classify the load of the motor 2 into four stages. The threshold values 1 to 4 are different from each other. The control unit 16 sets a large threshold value as the load on the motor 2 increases. Further, the duty ratio command value output from the control unit 16 can be switched stepwise between the duty ratio command values 1 to 4 in accordance with the load of the motor 2 in four stages. The greater the number appended to the command value, the greater the duty ratio.

  The “forward rotation” of the drive command value is a drive signal that individually turns on and off the transistors 48A to 48F so that the current passes through the coils 47A, 47B, and 47C in the direction in which the output shaft 4 is rotated forward. The “reverse rotation” of the drive command value is a drive signal for individually turning on / off the transistors 48A to 48F so that a current passes through the coils 47A, 47B, 47C in a direction in which the output shaft 4 is reversed. The drive command value “pause” turns off the transistors 48A to 48F so that no current flows through the coils 47A, 47B, and 47C in order to instantaneously stop the output shaft 4 at the top dead center or the bottom dead center. Drive signal. Moreover, the control part 16 outputs a drive command value within the range of predetermined time (a) ms (millisecond)-predetermined time (g) ms. These predetermined time (a) ms to predetermined time (g) ms are the time from the start of the output of the drive signal to the end.

  When the control unit 16 detects that the trigger 6 is turned on in step S1, the control unit 16 starts driving the motor 2 in step S2. The “driving of the motor 2” that is the process of step S2 includes that the control unit 16 outputs at least one of the driving signals “reverse rotation”, “pause”, and “forward rotation”.

  If demonstrating it concretely, the control part 16 will perform control of step S3-step S5. In step S3, the control unit 16 selects the duty ratio as the command value 1 in order to control the driving of the motor 2. In step S4, the control unit 16 outputs the drive signal “reverse rotation” for a predetermined time (a) ms, and rotates the output shaft 4 in the reverse direction. Here, the control part 16 performs the process of step S4 on the conditions of step S3. That is, the control unit 16 does not execute the process of step S4 after executing the process of step S3. The saw blade 21 descends when the output shaft 4 rotates in the reverse direction.

  In step S5, the control unit 16 outputs a drive signal “pause” for controlling the motor 2 for a predetermined time (b) ms. The output shaft 4 rotates in reverse with the inertial force while the drive signal “pause” is output. The control unit 16 determines whether or not the trigger switch 7 is turned off in step S6 subsequent to step S5. That is, the control unit 16 determines whether there is a condition for stopping the motor 2. If the control unit 16 determines Yes in step S6, the control unit 16 proceeds to step S7 and stops the motor 2. The control executed by the control unit 16 in step S7 is different from the drive signal “pause”.

  On the other hand, if the control part 16 judges No at step S6, the control part 16 will perform the process of step S8. In step S8, the drive signal “forward rotation” is output for a predetermined time (c) ms, and the output shaft 4 rotates forward. The saw blade 21 rises when the output shaft 4 rotates forward. Further, the control unit 16 starts monitoring the current value in the electric circuit 67 when a predetermined time (d) ms elapses from the time when the drive signal “forward rotation” is output. That is, the control unit 16 estimates the load of the motor 2 based on the current value.

  Then, the control unit 16 controls the duty command value as follows according to the estimated load of the motor 2. In step S9, the control unit 16 determines whether or not the current value is greater than or equal to a threshold value. If the control unit 16 determines No in step S9, the control unit 16 proceeds to step S10, continues the duty command value 1, and drives the motor 2. In step S11, the control unit 16 outputs the drive signal “pause” for a predetermined time (e) ms. More specifically, the control unit 16 outputs the drive signal “pause” from the time when the drive signal “forward rotation” is completed. The output shaft 4 rotates forward with inertial force while the drive signal “pause” is output.

  The control unit 16 outputs the drive signal “pause” for a predetermined time (e) ms, and then executes the processes of step S12 and step S13. The process of step S12 is to output a drive signal “reverse”. Step S13 specifies the time when the control unit 16 outputs the drive signal “reverse rotation” and the duration for outputting the drive signal “reverse rotation”. Specifically, the drive signal “reverse rotation” is output after the position sensor 510 detects that the plunger 22 has reached top dead center. The drive signal “reverse rotation” is output for a predetermined time (f) ms.

  And the control part 16 returns to step S5, after performing the process of step S12 and step S13. That is, after outputting the drive signal “reverse” for a predetermined time (f) ms, the control unit 16 switches the drive signal from “reverse” to “pause” and outputs the drive signal “pause” for a predetermined time (b) ms. .

  If the control unit 16 determines Yes in step S9, it determines whether or not the current value of the electric circuit 67 is greater than or equal to the threshold value 2 in step S14. The threshold value 2 is larger than the threshold value 1, and the load of the motor 2 is larger in the threshold value 2 than in the threshold value 1. If it is determined No in step S14, the controller 16 drives the motor 2 with the duty ratio for controlling the inverter circuit 66 as the command value 2 in step S15, and proceeds to step S11.

  When the control unit 16 determines Yes in step S14, the control unit 16 determines whether or not the current value of the electric circuit 67 is greater than or equal to the threshold value 3 in step S16. The threshold 3 is larger than the threshold 2, and the load of the motor 2 is larger in the threshold 3 than in the threshold 2. If the control unit 16 determines No in step S16, in step S17, the motor 2 is driven with the duty ratio for controlling the inverter circuit 66 as the command value 3, and the process proceeds to step S11.

  If the control unit 16 determines Yes in step S16, the motor 2 is driven with the duty ratio for controlling the inverter circuit 66 as the command value 4 in step S18, and the process proceeds to step S11.

  When the control unit 16 executes Steps S5 to S18, the output shaft 4 of the motor 2 is alternately switched between forward rotation and reverse rotation, and the operation of raising and lowering the plunger 22 and the saw blade 21 is repeated.

  In step S8, the control unit 16 starts monitoring the current value after a predetermined time (d) ms has elapsed since the output shaft 4 started to rotate forward. The reason is as follows. When the stopped output shaft 4 starts rotating or when the rotation direction of the output shaft 4 is switched, the load becomes higher than when the output shaft 4 is rotating. That is, in order to detect the current value resulting from cutting the workpiece 80 with the saw blade 21, and not to detect the increase in current value caused by the output shaft 4 starting to rotate in a predetermined direction. It is.

  The control unit 16 in the jigsaw 1 of the present embodiment increases the command value of the duty ratio that controls the inverter circuit 66 as the load on the motor 2 increases. Therefore, as the duty ratio command value increases, the rotational force of the output shaft 4 increases, and the force transmitted to the saw blade 21 increases.

  That is, when the work material 80 is cut by rotating the output shaft 4 forward and raising the saw blade 21, a strong operating force is applied to the saw blade 21 as the load on the saw blade 21 increases. Can communicate. Therefore, fluctuations in the operating speed of the saw blade 21 can be suppressed, and the position of the top dead center of the plunger 22 can be controlled to be constant.

  On the other hand, when the output shaft 4 rotates in the reverse direction, the saw blade 21 moves down away from the work material 80, so that a load for cutting is not applied to the saw blade 21. When the output shaft 4 rotates in the reverse direction, the duty ratio command value is set larger as the load on the motor 2 increases. For this reason, when the output shaft 4 rotates reversely and the plunger 22 descends, the moving distance of the saw blade 21 per unit time becomes long. That is, the reciprocation amount when the plunger 22 moves from the top dead center toward the bottom dead center increases as the load on the motor 2 increases. In other words, the amount of reciprocation of the saw blade 21 can be changed according to the load of the motor 2. The operation amount between the top dead center and the bottom dead center of the plunger 22 is a stroke amount.

  Here, another example of control for changing the reciprocation amount of the plunger 22 and the saw blade 21 in accordance with the load of the motor 2 will be described. Another control example is to change the predetermined time (c) ms for forward rotation of the output shaft 4 and the predetermined time (f) ms for reverse rotation according to the load of the motor 2.

  Specifically, the predetermined time (c) ms and the predetermined time (f) ms are increased as the load on the motor 2 increases. If it does in this way, according to the load of the motor 2, the position of the bottom dead center of the saw blade 21 can be changed. The above control means that the rotation angle of the output shaft 4 is increased as the load of the motor 2 is increased. Therefore, the control unit 16 controls the rotation angle of the output shaft 4 instead of controlling the predetermined time for rotating the output shaft 4 in steps S4, S8, and S13, so that the plunger 22 and the saw blade 21 are controlled. It is also possible to change the amount of reciprocation.

  In the time chart of FIG. 7, the trigger ON is detected at time t1. The duty ratio command value 1 is output from time t1 to time t2. Further, the duty ratio command value 2 is output from time t2 to time t3. Also, the duty ratio command value 3 is output from time t3 to time t4. Further, the duty ratio command value 4 is output from time t4 to time t5. In addition, between time t1 and time t5, the drive signals “reverse”, “pause”, and “forward” are alternately switched and output.

  A first modification of the jigsaw 1 according to the first embodiment will be described with reference to FIG. A changeover switch 65 that can be operated by an operator is provided in the housing 3 of the jigsaw 1. The control circuit of FIG. 5 can also be applied to the jigsaw 1 of FIG. The signal output from the changeover switch 65 is input to the control unit 16. The operator can set the movement amount of the plunger 22 and the saw blade 21 to rise and fall by operating the changeover switch 65.

  The control unit 16 controls the rotation angle at which the output shaft 4 rotates in the forward direction and the rotation angle at which the output shaft 4 rotates in reverse according to the set value of the changeover switch 65. The operation amounts of the plunger 22 and the saw blade 21 set by operating the changeover switch 65 are set at an initial stage of driving the stopped motor 2. That is, the operation amount set by operating the changeover switch 65 is not related to the load of the motor 2.

  When the controller 16 stops the motor 2 in step S7, the position of the plunger 22 in the operation direction may be any. On the other hand, when stopping the motor 2 in step S7, the control unit 16 can determine by control which position the plunger 22 is in the operation direction to stop the motor 2.

  FIG. 8 and FIG. 9 show a second modification example of the jigsaw 1 of the first embodiment, specifically, a modification example in which the motor 22 is stopped when the plunger 22 is in the movement direction. A description will be given with reference to a). The jigsaw 1 shown in FIG. 8 has a holding mechanism for holding the saw blade 21 at the top dead center in a state where the saw blade 21 is stopped at the top dead center when the motor 2 is stopped in step S7 in FIG. Show.

  The holding mechanism has a groove 71 provided at the upper end of the plunger 22 and an elastic body 72 attached to the housing 3. The elastic body 72 is the housing 33 and is disposed above the plunger 22 when the plunger 22 is located at the top dead center. The elastic body 72 is integrally formed of urethane rubber, for example. The elastic body 72 is fixed to the housing 3, and after the output shaft 4 of the motor 2 is stopped, the elastic body 72 is fitted into the groove 71 so that the plunger 22 and the saw blade 21 can be held at the top dead center. .

  Since the position sensor 510 is provided in the housing 3 shown in FIG. 9A, the control unit 16 detects that the saw blade 21 has reached the top dead center, and stops the motor 2 to thereby stop the saw blade. 21 can be positioned at the top dead center. Since the stop position of the saw blade 21 is the top dead center, when the saw blade 21 is stopped, the workpiece 80 is easily visible without being hidden by the saw blade 21, and the operator can cut the workpiece 80 at the maximum. It is possible to easily determine the depth.

  Moreover, it is preferable that the control unit 16 is provided with a calibration mode for performing calibration when the saw blade 21 is moved to the top dead center, for example. In the calibration mode, for example, the calibration may be executed from the fluctuation of the current value when the motor 2 is operated with no load.

  Further, the first top dead center when the saw blade 21 is stopped and the second top dead center when the saw blade 21 is operating while cutting the work material 80 may be the same. May be different. When the first top dead center is different from the second top dead center, the first top dead center is higher than the second top dead center.

  Note that the flowchart of FIG. 6 can also be executed in the jigsaw 1 shown in FIG.

(Second Embodiment)
Next, a jigsaw that is a second embodiment of the present invention and the structure of the jigsaw will be described with reference to FIGS. FIG. 10 is a partial cross-sectional side view showing the jigsaw 1. In the jigsaw 1 of FIG. 10, the same parts as those of the jigsaw 1 of FIG. The jigsaw 1 according to the second embodiment includes a cam 50. The cam 50 has a disc-shaped cam body 50c as shown in FIGS. The cam body 50c is disposed between the plunger 22 and the weight 24 in the direction along the axis Y1.

  Further, a first support shaft 50a and a second support shaft 50b are provided with a phase shift of 180 degrees in the circumferential direction of the cam body 50c. The first support shaft 50a and the second support shaft 50b are provided on the front and back surfaces of the cam body 50c so as to protrude away from each other. The cam body 50c and the first support shaft 50a are the first motion converter A1, and the cam body 50c and the second support shaft 50b are the second motion converter A2.

  As shown in FIGS. 12 to 14, the plunger 22 is provided with a third long hole 51 extending in the left-right direction. The first support shaft 50 a is slidably disposed in the third long hole 51. The weight 24 is provided with a fourth long hole 52 extending in the left-right direction. The second support shaft 50 b is slidably disposed in the fourth elongated hole 52. The driven gear 19 is provided with a hole 53 at a position eccentric from the axis Y 1, and an end of the second support shaft 50 b is disposed in the hole 53.

  The plunger 22 is supported by a guide sleeve 28 so as to be slidable in the vertical direction. The weight 24 is supported by four guide pins 41 so as to be slidable in the vertical direction. Accordingly, when the driven gear 19 rotates about the axis Y1, the cam body 50c rotates about the axis Y1, and the first support shaft 50a and the second support shaft 50b revolve around the axis Y1. To do. For this reason, the operating force of the first support shaft 50a is transmitted to the plunger 22, and the plunger 22 reciprocates in the vertical direction. Further, the operating force of the second support shaft 50b is transmitted to the weight 24, and the weight 24 reciprocates in the vertical direction. The direction in which the plunger 22 operates is opposite to the direction in which the weight 24 operates.

  Also in the jigsaw 1 in the second embodiment, the control circuit of FIG. 5 can be used, and the flowchart of FIG. 6 can be executed. Moreover, in the jigsaw 1 of 2nd Embodiment, the flowchart shown in FIG. 15 is executable. Of the steps shown in FIG. 15, the description common to the steps shown in FIG. 6 is omitted.

  The flowchart of FIG. 15 is different from the flowchart of FIG. 6 in the steps executed when it is determined Yes in step S16. If the controller 16 determines Yes in step S16, it determines whether or not the current value of the electric circuit 67 is equal to or greater than the threshold value 4 in step S19. The threshold value 4 is larger than the threshold value 3, and the load of the motor 2 is larger in the threshold value 4 than in the threshold value 3. If the control unit 16 determines No in step S19, the control unit 16 proceeds to step S18.

  If the control unit 16 determines Yes in step S19, it continues to output the drive signal “normal rotation” in step S20. Moreover, the control part 16 performs the process of step S21, and returns to step S6. In step S21, the position sensor 510 detects the current value of the electric circuit 67 after driving the motor 2 for a predetermined time (g) ms from the time when the position sensor 510 detects that the plunger 22 has reached top dead center. It is. The processes of steps S20 and S21 appear as processes after time t5 in the time chart of FIG.

  As described above, the control unit 16 executes the flowchart of FIG. 15, and when the current value is less than the threshold value 4, the output shaft 4 repeats forward rotation and reverse rotation alternately, and the plunger 22 and the saw blade 21 are moved up and down. Reciprocate in the direction. On the other hand, if the current value is equal to or greater than the threshold value 4, the control unit 16 continues the control to rotate the output shaft 4 in the forward direction and reciprocates the plunger 22 and the saw blade 21 in the vertical direction.

  That is, when the load of the motor 2 is equal to or larger than the magnitude corresponding to the threshold value 4, the plunger 22 and the saw blade 21 are reciprocated by causing the output shaft 4 to rotate forward. The power transmission efficiency when the output shaft 4 is rotated forward and the plunger 22 and the saw blade 21 are reciprocated is the power transmission efficiency when the output shaft 4 is alternately rotated forward and reverse and the plunger 22 and the saw blade 21 are reciprocated. Higher than transmission efficiency.

  According to the jigsaw 1 of the second embodiment, the first support shaft 50a and the second support shaft 50b are provided with the phase shifted by 180 degrees in the circumferential direction of the cam 50. The first support shaft 50a and the second support shaft 50b are provided on the front and back surfaces of the cam 50 so as to protrude in directions away from each other. The plunger 22 is provided with a third long hole 51. The first support shaft 50 a is slidably disposed in the third long hole 51. The weight 24 is provided with a fourth long hole 52. The second support shaft 50 b is slidably disposed in the fourth elongated hole 52.

  Therefore, by rotating the cam body 50c, the plunger 22 and the weight 24 are reciprocated with phases opposite to each other, so that vibration generated in the jigsaw 1 can be suppressed.

  FIG. 16 shows another example of a control circuit used in the jigsaw of the first embodiment and the jigsaw of the second embodiment. The control circuit of FIG. 16 has a DC power supply 39A instead of the AC power supply 39B. The control circuit of FIG. 16 is different from the control circuit of FIG. 5 in that the rectifier 420, the capacitor 43, and the resistor 45 are not provided. The jigsaw 1 provided with the control circuit of FIG. 16 can execute the flowchart of FIG. 6 or the flowchart of FIG.

  In each embodiment, it is also possible to provide a bottom dead center detection mechanism that detects that the plunger 22 is located at the bottom dead center. This bottom dead center detection mechanism is satisfied by a magnet and a bottom dead center sensor. A signal from the bottom dead center sensor is input to the control unit 16. The control unit 16 can detect that the plunger 22 or the saw blade 21 has reached the bottom dead center.

  The control unit 16 detects the operation position of the plunger 22 and the saw blade 21 without using the signals of the position sensor 510 and the bottom dead center detection mechanism, the signal of the rotation position detection unit 49, and the rotation angle detection unit 500. It is also possible to use these signals. The operating positions of the plunger 22 and the saw blade 21 include a bottom dead center and a top dead center.

  That is, the control unit 16 can calculate the operation positions of the plunger 22 and the saw blade 21 from the signal of the rotation position detection unit 49, the signal of the rotation angle detection unit 500, and the gear ratio between the drive gear 18 and the driven gear 19. It is. In this case, in order to prevent a deviation between the actual operation position of the plunger 22 and the saw blade 21 and the operation position of the plunger 22 and the saw blade 21 calculated by the control unit 16, the drive gear 18 and the driven gear 19 are not moved. It is preferable that the gear ratio between them is divisible.

  Here, the correspondence relationship between the configuration described in the first embodiment and the second embodiment and the configuration of the present invention will be described. The driven gear 19 corresponds to the rotating element of the present invention, and the inner edge 26b corresponds to the present invention. The inner edge 39a corresponds to the "inner edge of the second long hole" in the present invention. The axis Y1 corresponds to the axis of the present invention, the motor 2 corresponds to the electric unit of the present invention, the Hall element 68 corresponds to the Hall element of the present invention, the control unit 16 corresponds to the control unit of the present invention, It corresponds to a stop condition detector, a position detector, and a load detector. Further, turning off the trigger switch 7 corresponds to a stop condition in the present invention.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in each embodiment, the name of the relationship between forward rotation and reverse rotation does not limit the invention.

  The reciprocating tool of the present invention is not limited to a jigsaw, and can be applied to a cutting tool that performs a reciprocating operation to perform a cutting operation. For example, the present invention can be applied to a reciprocating tool that reciprocates a tip tool and cuts an object, such as a saver saw, a gardening clipper, and a cut saw.

  According to the reciprocating tool of the present invention, the tip tool that reciprocates with the power of the drive unit to process the object and the weight for damping the vibration are operated in opposite directions to each other. The generated vibration can be used for a reciprocating tool capable of suppressing vibration. Processing the object includes cutting the object, polishing the object, cutting the object, and peeling the object. The rotating element in the present invention includes a pulley, a sprocket, a rotating shaft, and a carrier of a planetary gear mechanism in addition to a gear.

  In the reciprocating tool of the present invention, the drive unit that reciprocates the operating unit includes a motor whose output shaft rotates only in one direction. The drive part in this invention contains a hydraulic motor, a pneumatic motor, and an internal combustion engine other than the brushless motor as an electric motor. An internal combustion engine is a power source that burns fuel and converts heat energy into kinetic energy of an output shaft. Since the rotation shaft of the internal combustion engine rotates only in one direction, when the internal combustion engine is used as a drive unit, a switching device that switches the rotation direction of the output shaft forward and backward with respect to the rotation direction of the rotation shaft is used. The switching device includes a structure using a well-known planetary gear mechanism and a structure using a well-known parallel shaft gear mechanism.

  Further, according to the present invention, when the reciprocating tool is viewed from above, the reciprocating tool is seen from above, in addition to the reciprocating tool in which the center line of the output shaft of the drive unit and the axis of the rotating element are parallel or coincide with each other. When viewed, it includes a reciprocating tool whose centerline and axis intersect. The vertical direction in the present invention is the direction of gravity, that is, the vertical direction.

  INDUSTRIAL APPLICABILITY The present invention can be used for a reciprocating tool capable of reciprocating the tip tool in the length direction or reciprocating the tip tool within a predetermined angle range.

[0002]
Patent Literature [0005]
Patent Document 1: Japanese Unexamined Patent Application Publication No. 2007-62052 Summary of the Invention Problems to be Solved by the Invention [0006]
However, in the reciprocating tool described in Patent Document 1, a weight and a plunger are arranged in a direction along the axis with a gear interposed therebetween. The distance from the center of gravity of the reciprocating tool to the weight is different from the distance from the center of gravity of the reciprocating tool to the plunger. For this reason, the vibration of the main body cannot be reduced unless the weight of the weight is increased. As a result, there is a problem that the length of the main body increases in the direction along the axis, and the size of the reciprocating tool is increased.
[0007]
An object of the present invention is to provide a reciprocating tool capable of reducing the length of a main body in a direction along the axis of a rotating element and making the main body compact.
Means for Solving the Problems [0008]
The reciprocating tool according to the present invention is provided in the main body and supports the tip tool so as to be able to reciprocate, and is provided in the main body so as to be rotatable about an axis, and transmits power to the operating portion. A reciprocating tool that reciprocates the operating portion, and an output shaft that is provided in the main body and that transmits power to the rotating element is switched between forward rotation and reverse rotation. And a drive unit that reciprocates the operating unit, a weight that is provided in the main body and that can be reciprocated in a direction in which the operating unit reciprocates, and a drive unit that is provided in the main body and that drives the driving unit. A first motion converter that converts the rotational force of the output shaft of the unit into the reciprocating force of the operating unit; and the main body conversion unit that converts the rotational force of the output shaft into the reciprocating force of the weight. By the reciprocating motion of the operating part Having a second motion converter suppresses vibration generated.
Effects of the Invention [0009]
According to the present invention, the reciprocating tool can be made compact by reducing the length of the main body in the direction along the axis of the output shaft.
BRIEF DESCRIPTION OF THE DRAWINGS [0010]
FIG. 1 is a partially sectional side view showing an example of a reciprocating tool according to a first embodiment of the present invention.

Claims (17)

An actuator provided in the main body and supporting the tip tool so as to be able to reciprocate; a drive part provided in the main body; and provided in the main body so as to be rotatable about an axis, and power of the drive part A reciprocating tool comprising: a rotating element that transmits the operating part to the operating part to reciprocate the operating part,
A weight provided in the main body and provided so as to be capable of reciprocating in a direction in which the operating portion reciprocates;
A first motion converter provided in the main body and converting a rotational force of the rotating element into a reciprocating force of the operating unit;
A second motion conversion unit provided in the main body and converting a rotational force of the rotating element into a reciprocating force of the weight to suppress vibration generated by a reciprocating operation of the operating unit;
A reciprocating tool. The first motion converter is
A first elongated hole provided in the operating portion and extending along a direction in which the operating portion reciprocates;
A pinion disposed in the first slot and to which the rotational force of the rotating element is transmitted;
A first rack portion provided at an inner edge of the first elongated hole and meshing with the pinion;
The reciprocating tool according to claim 1, comprising: The second motion converter is
A second elongated hole provided in the weight and extending along a direction in which the weight reciprocates;
A second rack portion provided at an inner edge of the second long hole and meshing with the pinion disposed in the second long hole;
The reciprocating tool according to claim 2, comprising: The actuating portion and the weight are arranged to reciprocate across the axis of the rotating element;
The reciprocating tool according to claim 3, wherein a thickness of the weight is equal to or less than a thickness of the operating portion in a direction along the axis. A cam body that rotates with the rotational force of the rotating element is provided on the body,
The first motion converter is
A first support shaft provided on the cam body;
A third elongate hole provided in the operating portion and in which the first support shaft is movably disposed;
Have
The second motion converter is
A second support shaft provided on the cam body and disposed with a phase shift of 180 degrees in a circumferential direction of the cam body with respect to the first support shaft;
A fourth slot provided in the weight and in which the second support shaft is movably disposed;
The reciprocating tool according to claim 1, comprising:   The reciprocating tool according to claim 1, wherein the driving unit is capable of switching the rotating element between forward rotation and reverse rotation.   The reciprocating tool according to claim 1, wherein the driving unit includes a brushless motor that rotates when supplied with an electric current.   The reciprocating tool according to claim 1, wherein a control unit that controls a reciprocating amount of the operating unit is provided. The drive unit includes an electric unit that is supplied with current and rotates an output shaft,
The reciprocating tool according to claim 8, wherein the control unit controls a reciprocating amount of the operating unit by controlling a rotation angle of the output shaft. A load detection unit for detecting a load of the electric unit;
The reciprocating tool according to claim 9, wherein the control unit controls a reciprocating amount of the operating unit according to a load of the electric unit.   The reciprocating tool according to claim 10, wherein the control unit increases a reciprocal movement amount of the operating unit as a load of the electric unit increases. A change-over switch that can be operated by an operator and sets a reciprocating amount of the electric part is provided,
The reciprocating tool according to claim 9, wherein the control unit controls a reciprocating amount of the electric unit according to a value set by operating the changeover switch. The tip tool is reciprocated in the vertical direction,
A stop condition detection unit for determining whether or not there is a stop condition for stopping the tip tool,
The reciprocating tool according to claim 8, wherein the control unit stops the tip tool at a top dead center in the reciprocating direction when the stop condition is satisfied.   The reciprocating tool according to claim 9, further comprising a position detection unit that detects a position of the tip tool in a direction in which the tip tool reciprocates. A Hall element that detects a phase in the rotation direction of the output shaft and outputs a signal is provided,
The reciprocating tool according to claim 14, wherein the position detection unit detects a position of the tip tool from a signal of the Hall element. A weight provided in the main body and provided so as to be capable of reciprocating in a direction in which the operating portion reciprocates;
A first motion conversion unit provided in the main body and converting a rotational force of the rotating element into a reciprocating motion of the operating unit;
A second motion conversion unit that is provided in the main body and that converts a rotational force of the rotating element into a reciprocating motion of the weight and suppresses vibrations generated by the reciprocating motion of the operating unit;
Is provided,
The first motion converter is
A first elongated hole provided in the operating portion and extending along a direction in which the operating portion reciprocates;
A pinion disposed in the first slot and to which the rotational force of the rotating element is transmitted;
The reciprocating tool according to claim 8, further comprising: a first rack portion provided at an inner edge of the first long hole and meshing with the pinion. The second motion converter is
A second long hole provided in the weight and extending along a direction in which the operating portion reciprocates;
A second rack portion provided at an inner edge of the second elongated hole and meshing with the pinion;
The reciprocating tool according to claim 16, comprising: