JP2012050341A - Electric tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tiller in which reduction of the battery capacity of a secondary battery can be easily grasped by an operator.SOLUTION: There is no possibility of power source failure and the like in the middle of tilling work, as the residual capacity of a battery 48 is easily observed by bringing a display unit 26 to display a red color indicating that the electric capacity has been reduced when detecting that the difference of the voltages is less than a predetermined value and passing a predetermined time, by comparing the voltage of the battery 48 for feeding the electric power to an electric motor 8 for driving a rotary unit R for tilling a farm field, with a predetermined standard voltage.

Description

  The present invention relates to an electric field cultivator, and more particularly, to a hand-held mini electric field cultivator capable of easily performing a field work.

  As a mini electric cultivator, there is known an electric cultivator comprising a drive motor that operates with a secondary battery that rotationally drives a cultivating claw, and that is configured to drive a drive motor by turning on / off a switch provided on a hand handle. .

JP 2009-34000 A

  Patent Document 1 is provided with an indicator that indicates the remaining amount of the battery, and is lit when the battery is low. However, since the tillage work has a large load fluctuation, the voltage of the battery may be temporarily reduced. In this case, when the capacity of the battery is temporarily reduced, the light is turned on at that time and then turned off when the voltage is recovered. Then, it is difficult for the operator to know whether or not the voltage of the battery has been lowered only by lighting the indicator.

  Electric power tillers that use a secondary battery as a power source will always stop during the tillage work if the battery capacity remains so as not to interfere with the work because the tiller will not move if the battery is discharged during the tillage work. It is necessary to be careful. However, the electric field cultivator described in Patent Document 1 has a configuration in which the degree of discharge of the secondary battery cannot be immediately grasped for the reason described above.

  Then, the subject of this invention is providing the electric power tiller which an operator can grasp | ascertain easily that the battery capacity of the secondary battery fell.

The above-mentioned problem of the present invention is solved by the following means.
That is, the invention described in claim 1 includes a rotary part (R) for cultivating a field, an electric motor (8) for driving the rotary part (R), and a battery (48) for supplying electric power to the electric motor (8). And an electric field cultivator comprising a display unit (26) for displaying the state of the battery voltage capacity,
An electric tiller comprising a control device (100) for displaying on the display unit (26) in red when it is detected that the voltage value of the battery (48) is below the reference voltage value for a predetermined time. Machine.

  The control device (100) includes a charger (50) for charging the battery (48), and the charger (50) is connected to the battery (48) for charging. An overcharge prevention function for sending a charge stop signal for cutting the current flowing from the charger (50) to the battery (48) to the charger (50), and when the signal from the overcharge prevention function is received, the charging is completed. The electric field cultivator according to claim 1, wherein the electric power tiller is determined to display that the charging of the battery (48) is completed on a display unit (51) provided in the charger (50).

  According to the first aspect of the present invention, when it is detected that the state where the voltage value of the battery 48 is equal to or lower than the reference voltage value has continued for a predetermined time, the display unit 26 displays red to indicate that charging is required. Regardless of the fluctuation in the load, the voltage drop of the battery 48 can be reliably displayed and the operator can be urged to charge the battery.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, when charging is performed by connecting the charger 50 to the battery 48, charging that cuts the current flowing from the charger 50 to the battery 48 is performed. When a stop signal is sent to the charger 50, when the charge stop signal is received, it is determined that charging is complete, and the display unit (51) displays that the charging of the battery (48) is completed, thereby overloading the battery 48. Charging can be prevented.

It is a left view of the electric field cultivator of an embodiment of the invention. It is a rear view of the electric field cultivator of FIG. It is a top view of the electric power tiller of FIG. It is a left view of the electric field cultivator of FIG. It is a left view of the state which folded the handle | steering-wheel of the electric field cultivator of FIG. It is a side view explaining operation of the handlebar grip part of the electric power tiller of FIG. It is a principal part bottom view at the time of the non-operation (FIG. 7 (a) and action (FIG.7 (b))) of the operation safety apparatus T of the handlebar grip part of FIG. It is the front view (FIG. 8 (a)) and side view (FIG. 8 (b)) of the battery case of the electric power tiller of FIG. FIG. 9 is a bottom view (FIG. 9A) and a side view (FIG. 9B) of the battery case of FIG. 8. It is a top view when the battery case of the electric power tiller of FIG. 1 is removed. It is a control block diagram of the electric power tiller of FIG. FIG. 2 is a system block diagram of a battery unit, a motor, and a monitor unit of a display unit such as an operation state and the charger of the electric power tiller of FIG. 1. It is a flowchart of the residual amount monitor control of the battery electric capacity of the electric power tiller of FIG. It is a flowchart of the safe operation control of the motor of the electric field cultivator of FIG. It is a flowchart of the charger operation | movement control of the electric power tiller of FIG. It is a perspective view (FIG. 16 (a)) of the electric power tiller of FIG. 1, and a rear view (FIG.16 (b), FIG.16 (c)) of a battery case and a 100V power supply cassette, respectively. FIG. 18 is a perspective view (FIG. 17A) of the electric power tiller of FIG. 1 and a rear view of the battery case (FIG. 17B).

Embodiments of the electric power tiller of the present invention will be described below with reference to the drawings.
In this specification, the direction in which the operator with the manual handle of the electric field cultivator advances the field cultivator is referred to as the front, the opposite side is referred to as the rear, and the left / right direction is the left / right direction facing the forward direction of the field cultivator. To.

  A transmission frame 2 having a transmission shaft 41 (FIG. 4) is attached to the front of the machine body frame 1 having a longitudinal direction in the front-rear direction. And the rotary shaft 3 extended in the left-right direction which rotates around the horizontal axis by the transmission of the transmission shaft 41, a plurality of rotary claws 4 attached to the rotary shaft 3 as appropriate, and the side disk 5 attached to the left and right ends of the rotary shaft 3 Is provided (FIG. 1).

  A rotary cover 6 having a disk shape in plan view that covers the upper portion of the rotary part R is attached to the upper part of the body frame 1. A U-shaped wall 6a in a plan view is formed at the left and right center of the rotary cover 6, and an opening 6b (FIG. 10) is formed along the inside of the wall 6a. A motor cover 7 is attached to the front half of the opening 6b, and a drive motor 8 (FIG. 3) for transmitting power to the transmission shaft 41 is mounted inside the motor cover 7, and the rear half of the opening 6b. The battery case 9 containing the battery 48 (FIG. 12) is detachably mounted. The drive motor 8 and the battery case 9 are mounted on a mounting table 10 (FIG. 4) attached to the body frame 1 and are disposed through the opening 6 b.

  A front end side of a handle frame 11 extending in the front-rear direction is connected to the rear portion of the body frame 1. The handle frame 11 is inclined so that the rear side faces upward, and left and right operation handles 12a and 12b are branched at the rear end portion of the handle frame 11, and the rear of the left and right operation handles 12a and 12b is provided. Handle grips 13a and 13b for gripping the operator are attached to the ends.

  Further, a support wheel 14 that supports the machine frame 1 when moving the electric tiller and a resistance bar 15 that prevents dashing of the machine during the tilling work are provided at the rear end of the machine frame 1 below the handle frame 11. It is attached.

Next, the driving configuration of the aircraft will be described.
As shown in the rear view of the fuselage in FIG. 2 and the plan view of the fuselage in FIG. 3, a power switch 16 for turning on / off the motor drive power is provided at a position where the operation handles 12a and 12b branch from the handle frame 11, and the grips on either side An operation lever 17 (FIGS. 1 and 6) for turning the motor 8 on and off is provided in the vicinity of 13b. On the rear surface of the battery case 9, an output terminal 18 of the wiring 20 that connects the battery 48 (FIG. 12) in the battery case 9 and the drive motor 8 and a charging terminal 19 for charging the battery 48 are provided. The output terminal 18 and the charging terminal 19 are respectively provided on the left and right sides of the handle frame 11 when viewed from the rear of the machine body, so that the operator can easily attach and detach wiring from the rear side of the machine body on the operation side. . Further, since the output terminal 18 and the charging terminal 19 are arranged separately on the left and right sides with the handle frame 11 in between when viewed from the rear of the machine body, it is easy to understand visually and can prevent errors.

  Even when the electric power tiller is not used, the output terminal 18 can independently extract electricity from the battery. Therefore, the battery of the electric power tiller can be used as a power source for driving power other than the power tilling work. .

The wiring 20 (FIGS. 1 and 3) for connecting the battery 48 and the motor 8 is between the lower part of the battery case 9 and the lower part of the inclined part 6c formed on the outer periphery of the wall part 6a of the rotary cover 6 and the mounting table 10 described later. It is configured to pass through space.
The battery case 9 has a handle 9a on the upper surface, a plurality of position fixing feet 9b on the lower surface (FIG. 9), and a position fixing hole 10a for forming the position fixing feet 9b on the mounting table 10 (see FIG. 9). 10), the mounting position of the battery case 9 is fixed. Further, as shown in FIG. 10, the battery case 9 is supported by the wall 6a of the rotary cover 6 at the left and right side surfaces, and a long and narrow convex portion 9c (FIGS. 4 and 9) for fixing the position is formed on the front surface. The projecting portion 9c is configured to be engageable with an elongated recessed portion 7a for position fixing formed on the motor cover 7. Further, an opening 10b (FIG. 10) is provided at the left and right center of the mounting table 10, so that water that has flowed into the mounting table 10 with rainwater or the like can be temporarily stored in the opening 10b.

  Further, as shown in FIGS. 8 to 10, when the battery case 9 is set on the fuselage, the position-fixing protrusion 9c is inserted into the position-fixing recess 7a and is lowered as it is. Is inserted into the position fixing hole 10a of the mounting table 10 and the position of the battery case 9 is fixed. When the battery case 9 is taken out, it can be taken out simply by pulling up the handle 9a.

  The battery case 9 of the present embodiment is supported by the motor cover 7 on the front side and the wall portion 6a of the rotary cover 6 on the front side, but the wall portion 6a may be formed separately from the rotary cover 6. For example, it is good also as a structure which forms the wall part 6a attached to the mounting base 10 side. Further, by forming the wall portion 6a so as to be inclined upward, the support of the battery case 9 can be strengthened and the aesthetic appearance of the entire body can be improved. Further, a rear support wall 6d (FIGS. 2 and 10) is formed on the back side of the battery case 9 to support the battery case 9 from the back side. The rear support wall 6d is formed lower than the wall 6a that supports the side surface of the battery case 9, and the output terminal 18 and the charging terminal 19 are exposed to the rear side of the fuselage so that the output terminal 18 and the charging terminal 19 are connected. It is easy to connect.

  Next, the operation safety device T of the operation lever 17 will be described mainly with reference to FIGS. Here, FIG. 7 (a) shows a state when a pushing portion 31c (described later) of the operation safety device T is not in operation, and FIG. 7 (b) shows a handle grip portion 17b showing a state where the pushing portion 31c is pushed. It is a principal part bottom view.

  The operation lever 17 (17a, 17b) is configured to rotate around a horizontal shaft 30 provided on a cover member 29 having an inverted U-shape so as to cover a part on the base side of the handle 12b. It consists of a switch operating portion 17a formed on the front side of the horizontal shaft 30 and a gripping portion 17b formed on the rear side of the horizontal shaft 30. A spring 25 (FIG. 7) for returning the operating lever 17 to the initial position after the switch operating portion 17a is rotated downward by gripping the gripping portion 17b of the operating lever 17 includes a protrusion 30a integrated with the horizontal shaft 30 and a cover member. Connect to 29 appropriate locations.

  A moving shaft 31 (31a, 31b, 31c) is provided at a position where the wall surface of the cover member 29 at a position behind the horizontal shaft 30 is penetrated. The moving shaft 31 is supported in a direction (left-right direction) intersecting the gripping portion 17b, and is arranged on the wall surface of the cover member 29 so as to slide in the left-right direction. The moving shaft 31 is formed with a small diameter portion 31a and a large diameter portion 31b adjacent to each other in order from the inside of the machine body. The operation safety device T is constituted by these members 29 to 31 and the like. And it is set as the structure which the large diameter part 31b is located on the rotation locus | trajectory of the holding part 17b in the initial position of the operation safety apparatus T (refer Fig.7 (a)). Further, a pushing portion 31c for pushing the moving shaft 31 toward the outside of the body is formed at the inner end of the moving shaft 31, and a spring is applied to the moving shaft 31 between the pushing portion 31c and the wall surface of the cover member 29. 35 is wound.

Further, a limit switch (operation switch) 33 for turning on / off the driving of the motor 8 is provided on the cover member 29. A limit switch 33 is provided at a position where the switch operating portion 17a is pressed when the switch operating portion 17a is rotated downward by gripping the gripping portion 17b of the operating lever 17.
Thus, the operation safety device T of the operating lever 17 includes the switch operating portion 17a, the gripping portion 17b, the spring 25, the cover member 29, the horizontal shaft 30, the moving shaft 31 having the small diameter portion 31a, the large diameter portion 31b, and the pushing portion 31c. The limit switch 33 and the spring 35 are provided.

The operation at the time of tillage work of the operation lever 17 and the safety device T in the above configuration will be described below.
When the power switch 16 (FIG. 1) is turned on and the pushing portion 31c is pushed with the thumb, the moving shaft 31 moves laterally toward the outside of the machine body, the large diameter part 31b moves to the outside of the machine body, and the small diameter part 31a is operated. It is located on the turning locus of the lever 17 (see FIG. 7B). When the operator grips the gripping portion 17b, the switch operating portion 17a and the gripping portion 17b are rotated to a position where the limit switch 33 is turned on, and the motor 8 is driven to rotate the rotary portion R to perform the tilling work. (See FIG. 6 (b)). When the plowing work is started, the gripping portion 17b and the small diameter portion 31a are in contact with each other, and the operator releases the push portion 31c to stop the gripping portion 17b from returning to the initial position of the large diameter portion 31b. Tilling work can be continued with the portion 17b gripped.

  When stopping the tilling work, when the operator releases the gripping portion 17b, the switch operating portion 17a is rotated to the initial position by the action of the spring 25, the limit switch 33 is turned off, and the rotary portion R is stopped (FIG. 6C). )reference). Further, the moving shaft 31 moves to the inside of the machine body by the action of the spring 35 and returns to the initial position.

  Even when the operator carries the electric power tiller with the power switch 16 turned on, even if the operator suddenly abuts on the grip 17b of the operation lever 17 and the grip 17b rotates, the grip 17b is moved. The switch operating portion 17a does not rotate to the position where the limit switch 33 is engaged by contacting the large diameter portion 31b of the 31 and the limit switch 33 does not enter (see FIG. 6A). The rotary portion R does not rotate unless the gripping portion 17b is operated while the push portion 31c is pressed. Therefore, the rotary portion R unexpectedly moves when the operator is carrying the power switch 16 without knowing that the power switch 16 is on. It is safe because it does not rotate.

  A control block diagram centering on the control device (microcomputer) 100 of the electric power tiller of the present embodiment is shown in FIG. 11, a secondary battery (battery) 48 having a charging circuit and a discharging circuit, a motor 8, operating conditions, etc. FIG. 12 shows a system block diagram of a control device (microcomputer) 100 showing the relation of the monitor unit and the like of the display unit. The motor 8 is connected to a secondary battery (battery) 48 composed of a charging circuit 45, a discharging circuit 46 and a plurality of battery cells 47, and an operation signal is generated by turning on a limit switch (operation switch) 33. The motor 8 is rotated by supplying current from the battery 48. The battery cell 47 for driving the motor of the secondary battery 48 can be charged by a charger 50 provided separately.

Next, the configuration of the LED display unit will be described below.
In the vicinity of the power switch 16, a plurality of LED display portions 26 (FIG. 3) showing various operation states are provided. In the present embodiment, a power on / off LED display unit 26a, an operation on / off LED display unit 26b, and a battery remaining amount LED display unit 26c are provided. In the LED display unit 26a that is turned on and off, the first color green is emitted when the power switch is turned on, and when the overload is detected and a protection circuit (not shown) provided in the wiring 20 is activated, the second color is obtained. Red light is emitted. When the rotary switch R is driven by turning on the limit switch 33 in the on / off LED display portion 26b, the first color green is emitted, and a protection circuit (not shown) by a temperature sensor built in the motor 8 is provided. When activated, the second color, red, emits light. When the remaining amount of the battery 48 is normal, the LED indicator 26c for the remaining battery level emits green, which is the first color, and emits red, which is the second color, when the remaining amount is less than the set amount.

  In this way, various operation states are displayed on the LED display unit 26, and many operations can be displayed with a small number of LEDs by appropriately changing the color from the first color to the second color. By arranging the LED display unit 26 at a position that is easy to see from the operation side, it is easy to check various driving situations. Further, since the LED display unit 26 is provided adjacent to the power switch 16, the LED display unit 26 can be easily confirmed at all times when the power is turned on.

  In this embodiment, as shown in the flowchart of FIG. 15, the battery voltage is read and compared with a preset reference voltage, and the read voltage value is equal to or lower than the reference voltage value or the read voltage value and the reference voltage. When the difference between the two voltages is less than a predetermined value (for example, (0) V), an output for lighting the red lamp of the LED display unit 26c of the remaining battery level after a predetermined time (for example, (3) seconds) has passed since then. Put out. If the read voltage value is equal to or lower than the reference voltage value or the difference between both the read voltage value and the reference voltage value is equal to or greater than a predetermined value, the LED display unit 26c outputs an output that turns on the green lamp.

  In this way, it can be surely and easily known that the remaining amount of the battery 48 is below a certain amount, so when the remaining amount is below a certain value, the operator can be urged to charge, and there is no precaution in the middle of tillage work It is possible to prevent the power from being cut off.

Further, when the operation switch 33 is turned on when the key switch is turned on, no output is performed to the electric motor 9.
That is, when power is supplied to the electric motor 8 when the key switch shown in FIG. 2 is turned on, the input of the operation switch 33 is read immediately after the key switch is turned on, and when the operation switch 33 is turned on, the motor 8 is read. The LED display unit 26b for displaying on / off of driving is turned on in red (off of driving).

 When the operation switch 33 (FIG. 6) is turned on, the drive output of the electric motor 8 is not performed. When the operation switch 33 has a problem, the electric motor 8 is driven by turning on the key switch. It is safe because it can be prevented.

  As shown in FIG. 12, a charge stop signal from the battery 48 is sent to the charger 50 to complete the charge. In an electric power tiller that operates by driving the electric motor 8 with a secondary battery 48 having a charging circuit and a discharging circuit, as shown in the flowchart of FIG. 15, the charger 50 and the battery (secondary battery) 48 are connected. When charging is performed, an overcharge prevention function on the battery 48 side is activated to send a charge stop signal when current is cut to the charger 50. When the signal is received, it is determined that charging is complete, and the charger The charging completion display part (LED) 51 provided in 50 is lit in a completion color (green).

  Conventionally, before charging is completed on the charger 50 side (green monitor), a function for stopping charging is performed on the charging circuit 45 side of the battery 48 in order to prevent overcharging of the cell. When the cell voltage exceeds a certain value, charging is stopped so that no charging current flows to prevent overcharging. However, since it can only be determined that the charging current does not flow on the charger 50 side, it is not known whether the charging is normally completed or abnormal. That is, the green monitor indicating the completion of charging of the charger 50 may not operate normally. Therefore, when the charging stop signal by the function of preventing overcharging of the battery 48 is sent to the charger as described above, the charging completion determination can be performed more reliably.

  As shown in the flowchart of FIG. 15, in this embodiment, the voltage of the battery 48 being charged is read, and when the battery 48 is above a certain voltage, the current is detected, and when the current value is below a certain value, the charging is completed. However, even when the current value is not equal to or less than a certain value, it is determined that charging is complete when the charge stop signal from the battery 48 is on.

The control configuration of the present invention is based on the circuit of FIG. That is, in the circuit configuration of FIG. 12, the motor 8 is connected to a battery (secondary battery) 48 including a charging circuit 45, a discharging circuit 46, and a plurality of battery cells 47, and an operation signal is generated when the operation switch 33 is turned on. The electric current is supplied from the battery 48 and the motor 8 is rotated. And the battery 48 is charged with the charger 50. Next, the structure when an operator carries an electric power tiller is demonstrated below.
As shown in FIG. 5, the adjustment screws 36 (FIG. 1) for fixing and adjusting the front and rear positions of the left and right operation handles 12a and 12b are loosened to move the operation handles 12a and 12b around the pivot point 36a of the horizontal axis. Tilt to the front of the machine and tighten the adjustment screw 36 (FIG. 3) to fix the position. Then, the connecting rod 38 that connects the left and right operation handles 12a and 12b is configured to be positioned at the approximate center of the longitudinal direction of the fuselage at the approximate center of gravity of the fuselage and above the battery case 9. The operator can prevent the battery case 9 from being detached when carrying the electric tiller by carrying the connecting rod 38 or the connecting rod 38 and the bumper 39 at the front end of the machine body. In addition, the connecting rod 38 is configured to be substantially gate-mounted when viewed from the front when the left and right operation handles 12a and 12b are tilted forward, and the left and right operation handles 12a and 12b are moved downward without contacting the battery case 9. It can be defeated. At the time of carrying the electric tiller, the bucket 40 attached to the position covering the lower part of the rotary part R is attached to the machine body with a band (not shown) or the like, and the soil adhering to the rotary part R falls, It is possible to prevent the soil from being scattered around.

Next, the configuration of the front / rear balance of the electric power tiller of the present embodiment will be described below.
The axial center of the motor shaft 8a of the motor 8 arranged in the vertical direction is configured before the axial center position of the rotary shaft 3, and a battery case 9 is provided behind the axial center position of the rotary shaft 3. The handle frame 11 is provided at the rear. With this configuration, the center of gravity is taken near the battery case 9, and even if the capacity of the battery 48 accommodated in the battery case 9 is changed to change the weight of the battery case 9, the change in the center of gravity of the body is small.

Further, as shown in the perspective view of the electric power tiller of FIG. 16A, a 100V power cassette 21 may be detachably disposed on the rotary cover 6 in place of the battery case 9 containing a battery (not shown). it can.
When the 100V power supply cassette 21 is used, power is supplied to the cultivator through a 100V power supply harness 22 connected to a household outlet. For this purpose, the 100V power cassette 21 and the battery case 9 have the same shape, and the back surface of the 100V power cassette 21 shown in FIG. 16B is the same as the back surface of the battery case 9 that houses the battery 48 shown in FIG. A working coupler 21a used for supplying electric power to the drive motor 8 is disposed at the position. A charging coupler 48a for connecting to the charger 50 is disposed next to the working coupler 48b on the back surface of the battery case 9 shown in FIG.

  In some cases, a commercial power supply (AC 100 V AC) instead of a battery is used as an input power and converted to DC DC for driving the motor. At this time, by sharing the work coupler 48b, both the battery and the commercial power supply can be supported.

  A work coupler 21a is also arranged on the back of the 100V power supply cassette 21 shown in FIG. 16B, and a harness 22 and an outlet socket 23 for supplying power from a household power supply to a position adjacent to the work coupler 21a are provided. Is provided.

Further, as shown in the perspective view of the electric power tiller shown in FIG. 16A, a harness 22 that supplies power to the 100V power cassette 21 can be fixed to the operation handles 12a and 12b. Therefore, the harness 22 is not caught on the rotary shaft of the rotary blade 4.
Further, as shown in a rear view of the battery case 9 containing the rechargeable battery 48 (FIG. 17B), an external power supply extraction terminal can be provided in the battery case 9, and a plurality of external power supply extraction terminals can be provided. .
The external power supply terminal is used, for example, when supplying power to the light 24 provided on the front surface of the rotary cover 6 shown in the perspective view of the tiller shown in FIG. 17A or the speaker 28 attached to the handle grip 13b. .

  Although this embodiment has been described with an electric power tiller, it may also be used for a walking-type working machine that uses other energy that does not have a driving sound.

DESCRIPTION OF SYMBOLS 1 Airframe frame 2 Transmission frame 3 Rotary shaft 4 Rotary claw 5 Side disk 6 Rotary cover 6a Wall part 6b Opening part 6c Inclination part 6d Rear support wall part 7 Motor cover 7a Recessed part 8 Drive motor 8a Motor shaft 9 Battery case 9a Handle 9b Foot 9c Convex portion 10 Mounting table 10a Hole 10b Opening portion 11 Handle frames 12a and 12b Operation handles 13a and 13b Handle grip 14 Support wheel 15 Resistance rod 16 Power switch 17 Operation lever 17a Switch operation portion 17b Holding portion 18 Output terminal 19 Charging terminal 20 Wiring 21 100V power supply cassette 22 Harness 23 Outlet socket 24 Light 25 Spring 26 LED display unit 26a Power on / off LED display unit 26b Operation on / off LED display unit 26c Battery level LE Display unit 28 speaker 29 inverted U-shaped cover (member)
30 Horizontal axis 30a Protrusion 31 Movement axis 31a Small diameter part 31b Large diameter part 31c Push part 33 Limit switch (operation switch)
35 Spring 36 Adjustment screw 36a Rotation fulcrum 38 Connecting rod 39 Bumper 40 Bucket 41 Transmission shaft 45 Charging circuit 46 Discharging circuit 47 Battery cell 48 Secondary battery (battery) 48a Charging connector 48b Working coupler 50 Charger 51 Display unit 100 Control device T Operation safety device R Rotary part

Claims (2)

A rotary part (R) for cultivating the field, an electric motor (8) for driving the rotary part (R), a battery (48) for supplying electric power to the electric motor (8), and the state of the battery voltage capacity are displayed. In the electric field cultivator provided with the display unit (26)
An electric tiller comprising a control device (100) for displaying on the display unit (26) in red when it is detected that the voltage value of the battery (48) is below the reference voltage value for a predetermined time. Machine.   The control device (100) is provided with a charger (50) for charging the battery (48), and when charging is performed by connecting the charger (50) to the battery (48), the charger (50) An overcharge prevention function for sending a charge stop signal to cut the current flowing to the battery (48) to the charger 50, and when receiving a signal from the overcharge prevention function, it is determined that charging is complete, and the charger (50) The electric field cultivator according to claim 1, characterized in that a display (51) provided displays that the charging of the battery (48) has been completed.

Images