JP2013063053A - Electric working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric working machine in which an electronic control system for controlling the supply of power from a detachable battery unit to an electric motor is further simplified.SOLUTION: The electric working machine includes a main switch and a sub-switch disposed in an operation portion, a rechargeable battery unit for supplying power to the electric motor for transmitting power to a working unit through a power feeder, a power supply switch disposed on the battery unit side of the power feeder, and a motor power supply control portion assembled in the battery unit. The motor power supply control portion produces a control signal for controlling the opening or closing of the power supply switch on the basis of a switch state signal directly input from the main switch and the sub-switch through a signal wire, and outputs the control signal to the power supply switch.

Description

  The present invention relates to an electric working machine that controls driving of an electric motor fed from a battery based on a switch operation and uses the rotational force of the electric motor for tillage work or the like.

  Such an electric working machine controls power feeding from the battery to the electric motor by operating an operation device such as an operation lever switch or a main switch provided in the control unit. Such an electric working machine is known from Patent Document 1. The walking type electric working machine described in Patent Document 1 includes a tilling rotary that operates by a motor and a battery case that supplies power to the motor, and an operation device for operating the motor by using a power switch or a lever. A limit switch that is turned ON / OFF is installed. As an electronic control system for motor control, a charge control board and a discharge control board are provided in the battery case, and a signal control board is provided on the machine body side. The signal control board is connected to a power switch and a limit switch that is linked to the operation lever. The signal control board has a function of outputting a control signal to the discharge control board based on signals from the power switch and the limit switch. The discharge control board supplies power from the battery of the battery case to the motor based on the control signal from the signal control board, and drives the motor.

  In the electric working machine according to Patent Document 1, an electronic control unit for power feeding a motor is divided into a discharge control board provided on a battery case and a signal control board provided on the machine body side. Since these electronic control units are exposed to an undesired environment for electronic parts during tillage work or the like, dustproofing and waterproofing are required. For this reason, the discharge control board is housed in the battery case, and the signal control board is housed in the holder. As described above, since the electronic control system is divided into the battery case side and the machine body side, not only maintenance and inspection are troublesome, but also a double cost burden is imposed on dustproofing and waterproofing.

JP 2011-72211 A (paragraph number [0017-0052], FIG. 6)

  In view of the above circumstances, an object of the present invention is to provide an electric working machine that has a simpler electronic control system for controlling power feeding from a detachable battery unit to an electric motor.

  In order to achieve the above object, an electric working machine according to the present invention includes a work unit supported by a machine body, a main switch and a sub switch provided in a control unit supported by the machine body, and power to the work unit. An electric motor, a detachable rechargeable battery unit that supplies power to the electric motor via a power supply line, a power supply switch provided on the battery unit side of the power supply line, and a motor incorporated in the battery unit And a power supply control unit. Further, the motor power supply control unit generates a control signal for controlling opening / closing of the power supply switch based on a switch state signal directly input from the main switch and the sub switch via a signal line, and outputs the control signal to the power supply switch To do.

  In this configuration, the switch status signals of the main switch and the sub switch as input operation devices in the electronic control system that controls the driving of the electric motor are sent as they are to the motor power supply control unit incorporated in the battery unit. The motor power supply control unit controls driving of the electric motor through control on a power supply switch provided on a power supply line on the battery unit side between the battery unit and the electric motor based on the input switch state signal. That is, a substantial electric motor drive electronic control system is constructed in the battery unit. Thereby, since the electronic control device is not incorporated on the machine body side in practice, the configuration of the electronic control system as the entire electric work machine is simplified. In addition, by incorporating the motor power supply control unit into the battery unit that is originally considered waterproof, the motor power supply control unit is protected from dust and moisture.

  As a preferred embodiment of the electric work machine equipped with the control device for an electric work machine according to the present invention, the control unit operated by the operator is composed of a pair of left and right handles, one handle is provided with a main switch, and the other handle When the auxiliary switch is provided, the operation of the main switch and the operation of the auxiliary switch are distributed to the left and right hands of the operator, making it easier for the operator to be aware of the operation procedure.

  Further, in one preferred embodiment, the main switch is a push button switch and the sub switch is a lever switch. As a result, the operator operates the main switch and the sub switch with different operation methods, and the operator's awareness of the operation is improved. In this case, the operability is further improved by adopting a configuration in which the sub switch is switched ON / OFF by the displacement of the lever that can be operated by the hand holding the handle.

  As described above, in the present invention, the core member of the electronic control system is incorporated in the battery unit to be attached and detached, and on the machine body side, the electric motor connected by the battery unit and the power supply line, the battery unit and the signal line A main switch and a sub-switch connected by are provided. Accordingly, in one of the preferred embodiments according to the present invention, the electronic control system is configured such that the power supply line and the signal line are connected to a common connector unit that is coupled through attachment of the battery unit to the fuselage. It will be even easier.

It is a schematic diagram illustrating the basic principle of electric motor power feeding control according to the present invention. It is a perspective view which shows the external appearance of the electric management machine by this invention. It is a side view of an electric working machine. It is a side view of the body part of an electric working machine. It is a side view which shows mounting | wearing of the battery unit to the body of an electrically-driven working machine. It is a front view which shows mounting | wearing of the battery unit to the body of an electrically-driven working machine in a cross section. It is a cross section of a pushbutton switch apparatus. It is a schematic diagram which shows the operation state of the locking mechanism of a lever switch apparatus. It is a cross section of a lever switch apparatus. It is a functional block diagram of the control electronic system of an electric working machine. It is a flowchart figure which illustrates the flow of electric motor electric power feeding control.

  Before describing a specific embodiment of the present invention, the basic configuration of an electric motor drive control electronic system according to the present invention will be described with reference to FIG. Here, it is assumed that the electric working machine is a walking type tiller, and its control unit is a pair of left and right handles, one handle having a main switch and the other handle having a sub switch. An electric motor (hereinafter simply referred to as a motor) transmits rotational power to a working unit configured as a tilling rotor. In the example of FIG. 1, a motor power supply control unit that controls power supply from a battery to a motor is incorporated with a battery in a battery unit that is removably mounted on the body of the electric working machine.

  A power supply switch that creates an open state (power supply state) and a closed state (cut-off state) by a control signal output from the motor power supply control unit is interposed in a power supply line from the battery to the motor. The main switch can be selectively switched between ON and OFF, and provides an ON state signal to the motor power supply control unit when switched to ON and an OFF state signal when switched to OFF. Similarly, the sub switch can be selectively switched ON and OFF, and when the switch is switched ON, an ON state signal is given to the motor power supply control unit.

  A connector unit is provided between the battery unit and the airframe to be connected / disconnected when the battery unit is attached / detached to / from the airframe. In the present invention, between the battery unit and the fuselage, a switch status signal is supplied to the motor power supply control unit from the power supply line (including the power supply ground line on the power supply return side) for supplying power from the battery to the motor, and the main switch and the sub switch. Since only the signal line to be sent is included, if the power supply line and the signal line are included in the connector unit, only a single connector unit is required.

Hereinafter, a specific embodiment of the present invention will be described by taking an example in which an electric working machine is applied to a walking tiller.
As shown in FIGS. 2 and 3, the walking type tiller (hereinafter simply referred to as a tiller) 1 illustrated in this embodiment has a tiller rotor 2 at the bottom of the body 10, and a posture change by swinging back and forth. A steering handle 3 as a possible steering unit, a motor 5 for transmitting rotational power to the tilling rotor 2, and a battery unit 4 serving as a power source for the motor 5 are provided. The battery unit 4 is mounted on the support frame 14 rising obliquely rearward from the rear part of the body 10 so that the battery unit 4 can be mounted from the upper side and pulled out upward. A handle 4a is provided on the upper surface of the battery unit 4 so as to be easily carried. The steering handle 3 includes an arm-like right handle portion 3A and a left handle portion 3B, and is pivotally connected to a rearward projecting end portion of the support frame 14 on the base end side. Thereby, when not in use, the steering handle 3 can be folded forward. An artificial resin cover 11 covering the entire motor 5 and the lower half of the battery unit 4 forms the upper surface contour of the tiller 1 in a curved shape. The mounting table 100 whose outline is indicated by a two-dot chain line is a box body into which the lower part of the tiller 1 is inserted, and improves the stability and transportability of the tiller 1 when not in use.

  As can be understood from FIG. 4, the airframe 10 is substantially composed of a main frame 15 and a transmission case 17. The main frame 15 creates a motor support surface region for supporting the motor 5 and a battery support surface region for supporting the battery unit 4, and the motor support surface region and the battery support surface region are bent at an angle of about 30 degrees. ing. A swing arm 16 that can swing around a horizontal axis in the transverse direction of the aircraft is attached to the rear end of the main frame 15. The swing arm 16 has a downward posture (shown by a solid line in FIG. 3) and a rearward posture. (Indicated by a two-dot chain line in FIG. 3), a fixing means for fixing the swing arm 16 to the main frame 15 in each posture is provided. This fixing means is simply a lock pin and a lock hole.

  A moving wheel 12 is provided on the free end side of the swing arm 16, and a resistance rod 13 is attached to an intermediate portion of the swing arm 16. The moving wheel 12 is grounded in the downward posture of the swing arm 16, and the resistance bar 13 is grounded in the backward posture of the swing arm 16. The lifting height of the airframe 10 can be changed by changing the attachment position of the resistance rod 13 with respect to the swing arm 16 by the pin connection method.

  The transmission case 17 has a left and right bifurcated structure having a substantially L-shape in side view, in which the worm speed reducer 18 is incorporated, and the motor 5 is bolted to a flange portion formed at the upper end portion thereof. The output shaft of the motor 5 and the input shaft of the worm speed reducer 18 are connected by an intermediate transmission shaft drawn in dotted lines in FIG. 4, and the intermediate transmission shaft extends vertically in the transmission case 17. The output of the worm reducer 18 is transmitted to the drive shaft 20 of the tilling rotor 2 that extends from the lower end of the transmission case 17 to the left and right. A front guard 19 made of a round pipe steel material that extends forward in a loop shape that can be used as a grip portion when carrying the cultivator 1 is bolted to the upper portion of the transmission case 17.

  As shown in FIG. 1, the right handle portion 3A and the left handle portion 3B constituting the steering handle 3 are made of a round pipe material, and grips 3a and 3b are provided in the free end regions thereof. A nut-tightening mechanism with a knob is provided to fasten and fix the steering handle 3 to the support frame 14 by a swinging connection portion 30 between the steering handle 3 and the support frame 14. From this configuration, the steering handle 3 can set the steering handle 3 to an arbitrary posture with respect to the support frame 14 by operating the nut with knob.

  A lever switch device 32 is provided immediately on the machine body side of the grip 3a of the right handle portion 3A, and a push button switch device 31 is provided on the machine body side of the grip 3b of the left handle portion 3B. The lever switch device 32 incorporates a sub switch 82 that is turned ON / OFF by an operation displacement of a lever that can be operated by a hand holding the grip 3a. The push button switch device 31 incorporates a main switch 81 that is turned ON / OFF by a push operation.

  As apparent from FIGS. 4, 5, and 6, in the battery support surface region of the main frame 15, the cover 11 forms a battery housing wall 11 a that creates a box-shaped housing space. The battery unit 4 has a rectangular cross section, and the rectangular cross section has the same or slightly larger area than the rectangular cross section of the storage space created by the battery storage wall 11a. Therefore, the battery unit 4 inserted into the housing space of the battery housing wall 11a is firmly held by the elasticity of the battery housing wall 11a.

  A connector 9 for electrical connection between the battery housing wall 11a and the battery unit 4 is provided. The connector 9 includes a battery side connector portion 9a provided at the center of the bottom surface of the battery unit 4 and a machine body side connector portion 9b provided at the center of the bottom surface of the battery housing wall 11a. Here, the battery-side connector portion 9a has a socket shape and the fuselage-side connector portion 9b has a plug shape, but they may be reversed. Since the battery unit 4 is guided by the battery housing wall 11a so that the center is not accurately shifted by the elasticity of the battery housing wall 11a, the battery unit 4 can be reliably inserted into the housing space with the help of gravity. The side connector portion 9a and the fuselage side connector portion 9b are connected. The battery unit 4 accommodated in the accommodation space is pressed and fixed from above by a clamp-type fixture 14 a provided on the handle support frame 14.

  The connector 9 includes a plurality of pins and pin sockets such as a terminal for a power supply line for supplying power from the battery unit 4 to the motor 5, a terminal for a signal line such as the main switch 81 and the sub switch 82, and a ground terminal. Connection terminal.

  Next, the structure of the push button switch device 31 provided immediately on the machine body side of the grip 3b of the left handle portion 3B will be described with reference to FIG. The push button switch device 31 is turned on by rotating the operation unit, and the main switch 81 is turned on. The ON state is maintained, and the operation unit is returned to the home position by further pushing the pushed operation unit. In this type, the main switch 81 is mechanically turned on so that the main switch 81 is turned off. The push button switch device 31 includes a housing 130, a circular operation unit 131, a cylindrical body 132, a shaft body 133, a rotating body 134, and a base member 135 as main structural members.

  The cylindrical body 132 is inserted into a hole provided in the housing 130 and is fixed to the housing 130 by a circular flange portion. A shaft body 133 is inserted into the internal space formed in the cylinder body 132 along the cylinder axis. The shaft portion of the shaft body 133 and the bearing portion of the rotating body 134 that receives the shaft portion are engaged by the spline 138, and the rotating body 134 can slide with respect to the shaft body 133 in the cylinder axis direction. The rotation around the cylinder axis is impossible. Therefore, the shaft body 133 and the rotating body 134 rotate integrally. Further, a cam piece 133 a that engages with a cam groove (not shown) formed in the cylindrical body 132 is formed on the shaft body 133. The relationship between the cam piece 138 and the cam groove enables the shaft body 133 to slide in the axial direction at a predetermined rotation angle of the shaft body 133 with respect to the cylindrical body 132.

  The tip formed at the center of the rotating body 134 is thrust-supported on the center upper surface of the base member 135. A segment contact extending in the circumferential direction is provided on the upper surface of the base member 135, and a rotating contact that contacts the segment contact in a predetermined rotation angle range of the rotating body 134 on the lower surface of the rotating body 134 that faces the base member 135. The segment switch and the rotating contact constitute a main switch 81. A circular operation unit 131 is fitted in the head of the shaft body 133. A rotation biasing spring 136 that biases the rotation body 134 to the rotation home position is disposed between the rotation body 134 and the cylindrical body 132. Between the shaft body 133 and the rotating body 134, a sliding biasing spring 137 is disposed when the shaft body 133 is biased to the sliding home position.

  With the above configuration, in the push button switch device 31 in the OFF state (FIG. 7A), as step 1, the circular operation unit 131 is pressed down to a predetermined depth, so that the cam piece 133a of the shaft body 133 and the cam groove Therefore, the shaft body 133, that is, the circular operation unit 131 can be rotated. Next, as step 2, the circular operation unit 131 is rotated to a predetermined angle. As a result, the segment contact and the rotating contact come into contact with each other, and the main switch 81 is turned on ((b) in FIG. 7). Moreover, at this angular position, the shaft 133 can slide in the axial direction due to the relationship between the cam piece 133a and the cam groove, so that the shaft 133, that is, the circular operating portion 131 returns to the sliding home position. However, it is impossible to turn.

  In this push-button switch device 31 in the ON state (FIG. 7B), when a hand is placed on the upper surface of the circular operation part 131 and the circular operation part 131 is pressed down to a predetermined position, the cam piece 133a and the cam groove Accordingly, the shaft body 133 can rotate around the axis, and the shaft body 133 is returned to the rotation home position by the rotation biasing spring 136. Thereby, the rotating body 134 also returns to the rotating home position together with the shaft body 133, and the segment contact and the rotating contact are separated, and the main switch 81 is turned off ((a) in FIG. 7).

8 and 9 show a lever switch device 32 having a locking means. As is well known, the sub switch 82 incorporated in the lever switch device 32 is a limit switch 234 or a switch of that type that is turned from the OFF state to the ON state by pulling and swinging the lever 231 toward the handle. is there. The lever switch device 32 swings the arm 235 of the limit switch 234 from the OFF position to the ON position by pulling and swinging the lever 231 toward the grip 3a. The lever 231 can swing around the swing axis X1, and is biased by a spring 236 to its open position. Here, the locking means is formed as a rocking lock arm that rocks around the rocking axis X2. In the home position biased by the spring 237, the lock arm 232 locks the swing of the lever 231 from the open position. By swinging the lock arm 232 against the biasing force of the spring 237, the lock of the lever 231 by the lock arm 232 is released, the lever 231 can swing, and the limit switch 234, that is, the sub switch 82 is turned off. Can be turned ON.

Next, the internal structure of the battery unit 4 and the power supply wiring to the motor 5 and the signal wiring for driving control of the motor 5 in the body 10 will be described with reference to the functional block diagram of FIG.
The battery unit 4 includes a battery main body 40, a charge / discharge switch unit 41, a controller 42, a power supply unit 43, a power supply line 44 connected to the positive side of the battery main body 40, and a ground wire 45 connected to the negative side of the battery main body 40. Various signal lines 46 and a current switching unit 7 are provided.

  The charge / power supply switch unit 41 includes a power supply switch 41a and a charge switch 41b arranged in series with the power supply line 44, and each is constituted by an FET and a diode as is well known. The power supply switch 41a cuts off the power supply line 44 in the OFF state and connects the power supply line 44 in the ON state to enable power supply from the battery body 40 to the external load. The charging switch 41b enables power from a power adapter (not shown) to be supplied to the battery body 40 via the power supply line 44 during charging.

  The controller 42 is substantially composed of a one-chip microcomputer, and a motor power supply control unit 50 that performs power supply control on the motor 5 and a charge control unit that performs charge control on the battery body 40 by executing hardware and programs. 52 is produced. The motor power supply control unit 50 turns on the power supply switch 41 a based on the ON state of the main switch 81 and the ON state of the sub switch 82, permits power supply from the battery body 40 to the motor 5, and drives the motor 5. Let The motor power supply control unit 50 detects the signal from the main switch 81 and the sub switch in order to perform the check control that permits the power supply to the motor 5 only when the ON state of the sub switch 82 following the ON state of the main switch 81 occurs. A priority signal evaluation unit 51 that performs time-series evaluation of signals from 82 is included.

  The power supply unit 43 functions as an internal power supply for the battery unit 4 and supplies power to the controller 42 and the current switching unit 7.

  The battery side connector portion 9a provided in the battery unit 4 includes a power supply socket 91a as a power supply terminal for the power supply line 44, a first socket 92a that is a battery side terminal for the first signal line 46a, and a second signal. A second socket 93a which is a battery side terminal for the line 46b, a third socket 94a which is a battery side terminal for the third signal line 46c, and a fourth socket 95a which is a battery side terminal for the fourth signal line 46d. A fifth socket 96a as a battery side terminal for the fifth signal line 46e and an earth socket 97a as an earth terminal for the earth wire 45 are provided.

  A fuselage-side connector portion 9b provided on the fuselage 10 side so as to correspond to the battery-side connector portion 9a includes a feed pin 91b as a feed terminal for the feed wire 44 and a battery side terminal for the first signal line 46a. For the first pin 92b, the second pin 93b as the battery side terminal for the second signal line 46b, the third pin 94b as the battery side terminal for the third signal line 46c, and the fourth signal line 46d A fourth pin 95b as a battery side terminal, a fifth pin 96b as a battery side terminal for the fifth signal line 46e, and a ground pin 97b as a ground terminal of the ground wire 45.

  The current switching unit 7 allows a weak current to flow through the signal line when the controller 42 is in a sleep state for the purpose of energy saving when the cultivator 1 is not working, and when the controller 42 wakes up, the signal line is larger than the weak current. Has the function of flowing a large current.

  On the machine body side, the power supply line 44 is connected to the positive contact of the motor 5, and the ground wire 45 is connected to the negative contact of the motor 5. In order to detect overheating of the motor 5, the motor 5 is provided with an overheat switch 83 that is switched off in an overheat state exceeding a predetermined value. The overheat switch 83 has one sub-switch 82 connected to the second signal line 46b and the other connected to the upstream side of the overheat switch 83 of the first signal line 46a. Thereby, when the overheat switch 8 is operated due to motor overheating, even if the sub switch 82 is in the ON state, the controller 42 can consider that the sub switch 82 is in the OFF state, and stops power supply to the motor 5. be able to. One of the main switches 81 is connected to the third signal line 46c, and the other is connected to the fifth signal line 46e, which is a ground line.

  As described above, the motor 5, the main switch 81, and the sub switch 82 are arranged on the machine body side, and all the control system devices that control the driving of the motor 5 based on signals from the main switch 81 and the sub switch 82 are batteries. Arranged in the unit 4. That is, the drive control of the motor 5 is replaced with the power supply control of the battery unit 4, and the discharge switch for the discharge control that the battery unit 4 originally has is used as the power supply switch unit 41 for the drive control of the motor 5. Therefore, the electronic devices and wiring on the airframe side are simple.

  Next, a power supply routine based on the time series evaluation of the signal from the main switch 81 and the signal from the sub switch 82 performed by the priority signal evaluation unit 51 will be described with reference to the flowchart of FIG. The basis of this time-series evaluation is that an ignorance state in which power supply to the motor 5, that is, start-up is suspended is set based on the ON state signal from the sub switch 82 when the main switch 81 is in the OFF state. Is released by the OFF state signal. In the case where the neglected state is not set, when the ON state of both the main switch 81 and the sub switch 82 is confirmed, a power supply signal is supplied that closes the power supply switch 41a and enables power supply to the motor 5. Output to the switch 41a.

  In the power supply routine shown in FIG. 11, a check flag is used as a flag for setting the above-described neglected state. Accordingly, when this power supply routine starts, first, the state of the check flag is checked (# 01). If the check flag is reset (ignore state is not set), the states of the main switch 81 and the sub switch 82 are further checked (# 02).

If the main switch 81 and the sub switch 82 are in the ON state in the check of step # 02, a power supply permission command is sent from the motor power supply control unit 50 to the power supply switch 41a, and the power supply switch 41a is in the ON state (the power supply line 44 is energized). State), power supply to the motor 5 is started, and the motor 5 is driven (# 03).
If only the main switch 81 is in the ON state and the sub switch 82 is in the OFF state in the check of step # 02, the power supply to the motor 5 is in a standby state after the sub switch 82 is switched from the OFF state to the ON state. (# 04). Even in the standby state, the power supply line 44 remains blocked by the power supply switch 41a.
If it is determined in step # 02 that the main switch 81 is OFF and the sub switch 82 is ON, the check flag is set (# 05). The feed line 44 is cut off by the feed switch 41a (# 06), and the motor 5 remains stopped.

In step # 01, if the check flag is set (ignore state is set), the state of the sub switch 82 is further checked (# 07).
If the sub switch 82 is in the ON state in the check of step # 07, the check flag is left set (continuation of the ignoring state), and the cutoff of the power supply line 44 by the power supply switch 41a is maintained (# 06). 5 remains stopped.
If it is determined in step # 07 that the sub switch 82 is in the OFF state, the check flag is reset (cancellation of the ignored state). The feed line 44 is cut off by the feed switch 41a (# 06), and the motor 5 remains stopped.

  One power feeding routine ends with the above-described flow. However, by repeating this simple power feeding routine, work control of the tiller 1 is performed.

[Another embodiment]
[1] The electric working machine is not limited to an electric power tiller in which a working rotor is applied to the working unit 2, but various electric motors such as an electric lawn mower and an electric snowblower can be changed by appropriately changing the working unit. The present invention can be applied to a work machine.
[2] The mechanical structures of the control unit 3 and the airframe 10 are not limited in the present invention, and various forms can be employed.
[3] Various cross-sectional shapes of the battery unit 4 can be adopted, and the shape of the battery housing wall 11a may be determined so as to create a housing space suitable for the shape.

  The present invention can be applied to various electric working machines equipped with the battery unit 4 and driving the work unit 2 with the motor 5.

1: Electric power tiller (electric working machine)
2: Tillage rotor (work unit)
3: Handle (control section)
3a, 3b: Grip 5: Electric motor 4: Battery unit 9: Connector unit 31: Push button switch device (push button switch)
32: Lever switch device (lever switch)
10: Airframe 40: Battery 41a: Power supply switch 42: Controller 44: Power supply line 46: Signal line 50: Motor power supply control unit 51: Priority signal evaluation unit 52: Charge control unit 81: Main switch 82: Sub switch

Claims (4)

A work unit supported by the airframe, a main switch and a sub switch provided in a control unit supported by the airframe, an electric motor for transmitting power to the work unit, and supplying power to the electric motor via a power supply line A detachable rechargeable battery unit, a power supply switch provided on the battery unit side of the power supply line, and a motor power supply control unit incorporated in the battery unit,
The motor power supply control unit generates a control signal for controlling opening / closing of the power supply switch based on a switch state signal directly input from the main switch and the sub switch via a signal line, and outputs the control signal to the power supply switch Work machine.   2. The electric working machine according to claim 1, wherein the control unit includes a pair of left and right handles, the main switch is provided on one handle, and the sub switch is provided on the other handle.   The electric working machine according to claim 2, wherein the main switch is a push button switch, and the sub switch is a lever switch that can be operated by a hand holding the handle. The electric working machine according to any one of claims 1 to 3, wherein the power supply line and the signal line are connected to a common connector unit that is connected through attachment of the battery unit to the machine body.

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