JP2010068802A - Motor-driven pruning scissors - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pair of motor-driven pruning scissors increasing a work speed in pruning work of fruit trees, and achieving working convenience such as elimination of fatigue feeling of the hand. <P>SOLUTION: The pair of pruning scissors is equipped with a fixing blade and an operating blade, and performs pruning work by operating the operating blade by a driving force of a motor, and include a contact switch which is set on one side of a body for operating the motor, and comprises an operation contact and a fixation contact, and a portable operating switch which is formed in a separate annular form allowing putting between the fingers, and operates the motor by internally installing a magnet and sticking together the operation contact and the fixation contact of the contact switch with magnetic force. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric pruning shears, and more specifically, an electric type that can increase work speed during pruning work of fruit trees and can eliminate the feeling of hand fatigue and can improve work convenience. About pruning shears.

  In general, pruning shears, pruning saws, or swords are used for fruit trees, landscapes, various forest and flower crops and tree pruning.

Usually, since the pruning shears are simply dependent on the operator's human power, a lot of work time is required and the work ability is greatly reduced.
In order to solve this, many devices related to the electric pruning shears that operate on the basis of the driving force of the motor are available.
The blade of such an electric pruning scissors is composed of a fixed blade and an operating blade fixed to the main body, and the operating blade moves repeatedly in a certain section around a rotation axis formed on the fixed blade. Pruning work with fixed blade.
The repetitive movement of the working blade is repeatedly performed without condition by the rotational force of the motor.

  Recently, it is possible to use continuously for a certain time with one charge, and the preference for portable electric pruning scissors that are easy to handle has increased, so that the miniaturization and weight reduction are gradually pursued. It has become to.

  In the case of the recent electric pruning shears, emphasis is placed on stability as well as functionality, but in addition to the operation switch, a separate safety switch is provided to ensure safety during handling. Adding parts increases the size and weight, which is disadvantageous for reducing the weight and size of the equipment.

Furthermore, when using a conventional electric pruning scissors, the blade of the pruning scissors may not be able to cut the branches, particularly when trying to cut a branch that requires a driving force greater than the available load of the motor.
In this case, the pruning scissors blade may be pinched by the branches and may continue to be pinched.
When this happens, no further pruning work may be possible.
In this state, since the motor is placed in a continuous overload state, not only the motor but also other parts are damaged.

  Although fuses can be used to prevent this situation, such methods do not eliminate the user's inconvenience.

  The present invention has been devised in view of the above points, and an object of the present invention is to provide a new type switch having a separate safety switch that can be used by being sandwiched between fingers by separating from the main body. An object of the present invention is to provide an electric pruning scissors that embodies the means.

  Furthermore, another object of the present invention is to control the motor so that the motor rotates in the reverse direction when an abnormality occurs in the scissors for the pruning operation despite the supply of power to the blade during the pruning operation. It is an object of the present invention to provide an electric pruning scissors that can escape from general abnormal states including damages.

In order to achieve the above object, the present invention comprises an electric pruning shears comprising a fixed blade and a working blade, and performing a pruning operation by operating the working blade with a driving force of a motor.
It consists of a contact switch composed of an operating contact and a fixed contact installed on one side of the main body for the operation of the motor, and a separate ring shape that can be sandwiched between fingers, and has a magnet and a magnetic contact switch The electric pruning scissors further includes a portable operation switch that can operate the motor by pulling the operation contact and the fixed contact.

  According to the electric pruning shears of the present invention, it is a system that cuts the powerful driving force of the motor, so it is suitable for pruning all fruit trees such as pear trees and apple trees, as well as hard fruit mandarin trees and orange trees. In addition to exhibiting excellent performance, it is possible to ensure safety by configuring it with a separate component form that can be used with the switch for operating the device sandwiched between fingers. By adopting the switch, the size of the device body can be reduced, and the size and weight can be reduced.

  Since the electric pruning shears are thus reduced in size and weight, there is no hand fatigue and there is an effect that the convenience of work can be improved.

  Furthermore, by solving an abnormality such as a motor overload state that occurs during the pruning operation, there is an advantage that the durable life of the device can be extended, such as motor breakage and failure can be prevented.

  Also, a rotating ring with magnets is installed at the bottom of the main body of the electric pruning shears, and the battery power is supplied to the motor during the pruning operation by rotating the rotating ring. When the pruning shears are not used, the power supply unit By shutting off the battery power, unnecessary power consumption can be prevented by preventing electricity from entering the cable and the device main body.

  Furthermore, when the operating state of the operating blade is sensed through the hall sensor and the portable operating switch is attached to the contact switch and then removed, it is moved back and forth once, and the portable operating switch is continuously attached for a certain time during storage. In this case, the convenience of work can be achieved by making the operating blades in the closed state.

  Moreover, since the overall size of the device can be reduced by mounting the control bucks, which are separately configured separately from the device main body, inside the main body, it is easy to transport and handle.

1 is a diagram illustrating a closed state of an electric pruning shears according to an embodiment of the present invention. It is drawing which shows the open state of the pruning shears in FIG. It is the schematic which shows the operation | movement flow of a contact switch in FIG. It is the schematic which shows the operation | movement flow of the switch of a Hall sensor type by another Example of this invention. It is AA sectional drawing for demonstrating the on-off operation state of a safety means in FIG. FIG. 2 is a diagram for explaining a current flow diagram of a power supply unit in FIG. 1. It is explanatory drawing for demonstrating 1 reciprocation rotation of the working blade using a 1st Hall sensor and a 2nd Hall sensor in FIG. It is explanatory drawing for demonstrating 1 reciprocation rotation of the working blade using a 1st Hall sensor and a 2nd Hall sensor in FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a view showing a closed state of an electric pruning shear according to an embodiment of the present invention, and FIG. 2 is a view showing an opened state of the pruning shear in FIG.

  The electric pruning shears include a driving means composed of a motor 11 and a speed reducer 12, a fixed blade 13 and a working blade 14 that perform a substantial pruning operation, a control unit 19 that is in charge of operation control of the motor 11, and a power source. In order to operate the supply unit 26 and the motor 11, a portable operation switch 20 for operations such as on / off is included.

  The drive means plays a role of moving the working blade 14 with a driving force generated by a gear combination of the motor 11 and the speed reducer 12, and the fixed blade 13 and the working blade 14 perform a pruning operation while making a pair.

  The control unit 19 and the power supply unit 26 supply power for operating the motor 11 and the like, and control the power supplied to the driving means so that the motor 11 performs forward and reverse rotation functions.

  As the power supplied from the control unit 19 and the power supply unit 26, a rechargeable battery 27 or an external power source can be used.

  Further, the control unit 19 and the power supply unit 26 are supplied to the driving unit so as to determine whether or not an abnormality is caused during the pruning operation and to escape from the general pruning scissors abnormal state including the motor 11 of the driving unit. By changing the phase of the power source, the operation blade 14 is controlled to operate in reverse.

  As a result, the electric pruning shears themselves detect an abnormal state such as an overload that occurs during the pruning operation, and if it is determined that the detection result is an overload state, the pruning operation in progress is interrupted, and the motor 11 By operating the working blade 14 in reverse through the reverse rotation drive, it is possible to prevent damage to the internal motor 11 and the electric circuit portion.

  In particular, in the case of the portable operation switch 20, the electric pruning shear main body 10 is constituted by a separate part, and can be used by being sandwiched between fingers only during use.

  For example, the motor 11 can be driven by the ON operation of the contact switch 33 by applying the portable operation switch 20 to a contact switch built in the main body 10 with the finger sandwiched between the fingers.

  This means that the previous safety switch and its peripheral components can be removed from the main body 10 so that the overall size and weight of the electric pruning shears can be greatly reduced. Obtainable.

  The structure of the electric pruning shears will be described in more detail as follows.

  A motor 11 and a speed reducer 12 that are directly connected to each other are installed in the main body 10 of the electric pruning shears. At this time, the motor 11 is turned on and off by a contact switch 33 installed on one side of the main body 10. Driven or stopped while receiving or shutting off power supply.

  Here, the motor 11 is a motor 11 capable of forward / reverse rotation, and repeats forward rotation and reverse rotation when the contact switch 33 is turned on, whereby the operating blade 14 also repeats opening and closing. Pruning work.

  The upper end portion of the main body 10 wraps a gear portion 16 of the working blade 14 to be described later and a leg portion of the fixed blade 13 so that the working blade 14 and the fixed blade 13 spread, and a rectangular support is provided inside the upper end of the main body 10. Block 22 is installed. At this time, the leg portion of the fixed blade 13 is supported by the support block 22, and the shaft portion of the drive gear 15 for driving the working blade 14 is supported by the support block 22.

  That is, the drive gear 15 is supported so as to be able to rotate while being supported by a number of bearings inside the support block 22, and the shaft portion of the drive gear 15 thus supported is connected to the shaft of the speed reducer 12. Thus, the rotational force generated in the motor 11 is transmitted through the speed reducer 12.

  The fixed blade 13 and the working blade 14 that perform the pruning operation are substantially installed in a structure that is supported by the upper end portion of the support block 22.

  For example, both leg portions of the fixed blade 13 are fastened and installed at the upper end of the support block 22, and the support block 22 serves as a support, and the working blade 14 is placed on one surface of the fixed blade 13 installed in this way. Are fixed by the hinge pin 38 with the blades facing each other.

  Thus, the pruning operation can be performed while the working blade 14 is paired with the fixed blade 13 while rotating about the hinge pin 38 as a central axis.

  Due to the movement of the working blade 14, a fan-shaped gear portion 16 formed with a gear is integrally formed on one surface of the rear end portion of the working blade 14. The operating blade 14 is rotated by gear transmission with the drive gear 15 by engaging with the drive gear 15 on the side of the container 12.

  FIG. 3 is a schematic diagram showing an operation flow of the contact switch 33 in FIG.

  One embodiment of the present invention provides a contact switch 33 as means for interrupting the power supplied to the motor 11, and the contact switch 33 is composed of an operating contact 33 a and a fixed contact 33 b installed on one side of the main body 10. Is done.

  Since the operating contact 33a at this time has a structure that is elastically supported by the return spring, in a state where no external force is applied, for example, a state where no magnetic force is applied, the operating contact 33a is always separated from the fixed contact 33b by the restoring force of the return spring. This is the OFF state of the contact switch 33, and no power is supplied to the motor 11.

  On the other hand, when an external force is applied, for example, when a magnetic force is applied, the operating contact 33a is pulled by the magnetic force and is attached to the fixed contact 33b. This is an ON state of the contact switch 33, and power is supplied to the motor 11. The

  Since the portable operation switch 20 that functions as an operation switch and a safety switch for use of the electric pruning shears provided in the present invention has a ring shape, it can be used by being sandwiched between the fingers of the operator. .

  Further, since the portable operation switch 20 is made of a fiber material extending like rubber, it has an advantage that it is not easily detached even if it is sandwiched between any fingers, and the feeling of wearing is good.

  Such a portable operation switch 20 includes a magnet 21, and at this time, using the magnetic force generated by the magnet 21, the operation contact 33 a of the contact switch 33 is moved to the fixed contact 33 b.

  That is, when the magnet 21 of the portable operation switch 20 is applied to the contact switch 33 side of the main body 10, the operation contact 33 a made of a metal is pulled and stuck to the fixed contact 33 b. In response to the ON signal input, power is supplied to the motor 11.

  FIG. 4 is a schematic view showing an operation flow of a hall sensor type switch according to another embodiment of the present invention.

  In another embodiment of the present invention, a hall sensor type switch 36 can be provided instead of the contact switch 33.

  The Hall sensor type switch 36 includes a plate film 35 therein, and the plate film 35 is made of a conductive material. When the magnet 21 comes close, the plate 21 is pulled to the left or right side by a magnetic field, and two plates 36a. , 36b, an on signal is generated electrically. At this time, the controller 19 receives the electric signal (ON signal) and supplies power to the motor 11.

  As described above, since the portable operation switch 20 is separated from the main body 10 of the electric pruning shears and is configured as a separate part, the overall size and weight of the conventional electric pruning shears can be greatly reduced. In addition, when an operation switch is attached to the main body 10 of the electric pruning scissors as in the past, there is a risk of a safety accident that may occur when a child who does not know the operation method grabs and touches the operation switch. Can be prevented.

  In particular, in the present invention, by providing means that can prevent overload of the motor 11, it is possible to prevent damage to the motor 11, electrical wiring, and the like.

  For this reason, when a load is applied to the working blade 14 around the hinge pin 38 that is fastened for coupling the fixed blade 13 and the working blade 14 due to a state in which the working blade 14 is stuck in a branch during the pruning operation, That is, when the motor 11 continues to be operated with the progress of the working blade 14 being controlled, the sensor unit 37 that can sense the load at this time is installed.

  Here, the sensor unit 37 is a load cell capable of measuring the resistance change of the strain gauge and detecting the magnitude of the force with an electrical signal. However, a sensing means such as a torque limit can be applied. it can.

  The control unit 19 and the power supply unit 26 can control the operation of the motor 11 by switching signals from the portable operation switch 20 and the contact switch 33, but are operating in the positive direction for normal pruning work. When an abnormal state of the pruning scissors occurs, such as when the motor 11 is in an overload state, that is, a load value greater than the set value is sensed by the sensor unit 37, and this is input to the control unit 19 and the power supply unit 26. Then, the control unit 19 and the power supply unit 26 change the phase of the power supplied to the motor 11 and perform control so that the motor 11 rotates in reverse, so that the drive gear 15 operates reversely and an abnormal state is caused. It can be taken off.

  Here, a method of coupling and installing the sensor unit 37 so as to be interlocked with the operating blade 14, a method of obtaining a detection signal from the sensor unit 37 in conjunction with the operation of the operating blade 14, and a set value and a load value are processed. A method for outputting an appropriate control signal for the motor 11 may be adopted without particular limitation as long as it is a method generally known in the art.

  As another example, the control unit 19 and the power supply unit 26 sense the intensity of the current supplied to the motor 11 and set in advance in order to determine whether or not the motor 11 is in an overload state. The overload state of the motor 11 can also be determined by determining whether or not it is within the range.

  In addition to this, the control unit 19 and the power supply unit 26 can be variously realized by a method of detecting the overload state of the motor 11 by a method of detecting the strength of the voltage of the DC power supplied to the motor 11. Can do.

  The control unit 19 and the power supply unit 26 include a control unit 19 that generally controls the operation of the motor 11 and a power supply unit 26 that supplies power to the motor 11.

  A printed circuit board widely known in the art is used as the control unit 19, and the printed circuit board includes the sensor unit 37, a contact switch 33 or a hall sensor type switch 36, a first hall sensor 17 to be described later, The second hall sensor 18 and the motor 11 are electrically connected and can be electrically controlled.

  Furthermore, the control unit 19 according to an embodiment of the present invention is installed in the main body 10 and substantially below the motor 11 as a printed circuit board that is reduced in size and weight, so that an existing control box can be used. Compared with those separated from each other, the overall size and weight are reduced, so that the pruning operation and transportation are convenient.

  The power supply unit 26 is configured separately from the main body 10 and includes a battery 27, a substrate 28 (PCB), a relay 29, and the like housed in a case. At this time, the control unit 19 and the power supply unit 26 are connected by the cable 25 and the connection jack 30.

  5 is a cross-sectional view taken along line AA for explaining the on / off operation state of the safety means in FIG. 1, and FIG. 6 is a diagram for explaining a current flow diagram of the power supply unit 26 in FIG.

  In one embodiment of the present invention, the safety means provided at the lower end of the main body 10 is provided and the power supply unit 26 is cut off so that current does not flow through the cable 25, thereby causing damage to parts due to overload of the motor 11, It is possible to prevent unnecessary electrical energy consumption and safety accidents due to the inside of the main body 10 and the cable 25 being energized.

  For this purpose, the safety means is fixed by a fixed tube 24 installed at the lower end of the main body 10 and a rotating ring 23 supported so as to be rotatable outside the fixed tube 24. The guide groove is formed in the circumferential direction, and the rotating ring 23 can rotate along the guide groove.

  In the fixed tube 24 and the rotating ring 23, an iron part 31a and a magnet part 31b are installed on a circumference with a constant interval, for example, an interval of 180 °. Further, a reed switch 32 made of a conductive material is installed on the inner side (radial direction reference) so as to be adjacent to the iron portion 31 a of the fixed tube 24, and the reed switch 32 is connected to the relay 29 of the power supply unit 26.

  At this time, in the power supply unit 26, the cathode of the battery 27 is connected to the substrate 28, the relay 29 and the connection jack 30 by the first electric wire, and the anode of the battery 27 is connected to the substrate 28 and the connection jack 30 by the second electric wire. Is done.

  The operating state of the safety means having such a configuration will be described as follows.

  The rotating ring 23 can be rotated left and right as needed by an operator. For example, when the rotating ring 23 is rotated 180 ° to one side, the magnet portion 31b of the rotating ring 23 is turned into the iron portion 31a of the fixed tube 24. And the reed switch 32 installed so that the magnet part 31b of the rotating ring 23 is adjacent to the iron part 31a of the fixed tube 24 by the iron part 31a of the rotating ring 23 being attracted to the magnet part 31b of the fixed tube 24. Are connected to each other by magnetic force, and the reed switch 32 is turned on.

  Accordingly, the relay 29 is turned on by the ON signal of the reed switch 32, and the power of the battery 27 is supplied to the motor 11 of the main body 10 through the cable 25, and the rotational force generated by the motor 11 is transmitted to the working blade 14 through the gear device. Thus, the operating blade 14 is automatically moved to perform the pruning operation.

  On the other hand, when the rotating ring 23 is rotated 180 ° in the opposite direction or the same direction, the magnet portion 31b of the rotating ring 23 is turned into the magnet portion 31b of the fixed tube 24, and the iron portion 31a of the rotating ring 23 is turned into the iron portion of the fixed tube 24. Since the magnet portion 31b of the rotating ring 23 is far from the reed switch 32 installed so as to be adjacent to the iron portion 31a of the fixed tube 24 and the magnetic force does not act by being pulled by 31a, the reed switch 32 is turned off. Become.

  Accordingly, the relay 29 is turned off by the off signal of the reed switch 32, and the power of the battery 27 is not energized through the cable 25. Therefore, even when the electric pruning operation is not performed, the current is energized through the cable 25 to the main body 10. It is possible to prevent unnecessary power consumption and safety accidents.

  The usage state of the electric pruning shears thus configured is as follows.

As shown in FIGS. 1 and 2, when pruning a pear tree, an apple tree, an oak tree, a vine, or a fruit tree such as a hard citrus tree, an orange tree, or a palm tree, When a person touches the contact switch 33 side of the main body 10 with the ring-shaped portable operation switch 20 sandwiched between fingers, the operating contact 33a of the contact switch 33 sticks to the fixed contact 33b side by the magnetic force at this time. At the same time, power is supplied to the motor 11 and the motor 11 operates.
That is, the motor 11 rotates in the positive direction.

  Such an operation of the motor 11 includes an operation of the speed reducer 12 and a toothed electric motor between the drive gear 15 and the gear portion 16 of the working blade 14, and the working blade 14 rotates around the hinge pin 38 as a central axis, and eventually the fixed blade. 13 can cut fruit trees.

  At this time, the operation of the motor 11 shows an operation state in which the forward direction and the reverse direction are repeated, whereby the working blade 14 also forms a pair with the fixed blade 13 while repeating the forward direction or the reverse direction. Pruning work.

  Of course, the basic system is that the motor 11 is repeatedly operated in the forward / reverse direction once while the portable operation switch 20 held between the fingers is in contact with the contact switch.

  Here, while the portable operation switch 20 is continuously applied to the contact switch 33 built in the main body 10 according to the embodiment of the present invention, the motor 11 is repeatedly operated in the forward / reverse direction several times. At the moment when the portable operation switch 20 is released, the operation of the operating blade 14 is stopped while the operation of the motor 11 is interrupted.

  7 and 8 are explanatory views for explaining one reciprocal rotation of the working blade 14 using the first Hall sensor 17 and the second Hall sensor 18 in FIG.

  Furthermore, in another embodiment of the present invention, the first and second Hall sensors 17 for detecting the position of the rotating magnet 34 on the fixed blade 13 by installing the rotating magnet 34 in the gear portion 16 of the working blade 14. By installing 18, when the portable operation switch 20 is applied to the contact switch 33, the working blade 14 can be reciprocated only once.

  At this time, the first and second Hall sensors 17 and 18 are installed at the upper end of the fixed blade 13 on the leg side so as to correspond to both ends of the rotation radius of the rotating magnet 34 installed in the gear portion 16 of the working blade 14. .

  For example, when the rotating magnet 34 moves to the first hall sensor 17 and is sensed by the first hall sensor 17, the control unit 19 and the power supply unit 26 receive a sensing signal from the first hall sensor 17 and receive a motor. A rotation control signal is sent to 11, and the working blade 14 opens when the motor 11 rotates in the reverse direction.

  On the other hand, when the rotating magnet 34 moves to the second hall sensor 18 and is sensed by the second hall sensor 18, the control unit 19 and the power supply unit 26 receive a sensing signal from the second hall sensor 18 and receive a motor. A stop control signal is sent to 11, and the working blade 14 is stopped in the open state.

  While the portable operation switch 20 is kept in contact with the contact switch 33 by changing the circuit of the substrate as in the above-described embodiment, the motor 11 can be continuously operated several times. The portable operation switch 20 may be attached to the main body 10 by using a sensor so as to be reciprocally operated only once.

  Further, when the circuit of the substrate is changed according to another embodiment, and the portable operation switch 20 is continuously brought into contact with the contact switch 33 for a certain time, for example, 3 to 4 seconds, the working blade 14 is closed. can do. In this case, the working blade 14 can be operated by detecting the position of the working blade 14 using the Hall sensor and controlling the motor 11.

  Here, the method of electrically controlling the forward and reverse rotations of the motor 11 is generally known in the art, as is the case with the electrical control method employed in ordinary electric pruning shears. Can be adopted without any particular restrictions.

  Thus, the switch means for operating the electric pruning shears is not provided on the pruning shears main body 10 side, but can be provided separately and stored separately, so that pruning due to carelessness of children or unskilled persons, etc. It can prevent the malfunction of scissors at the source, and it has a great effect on safety accident prevention. Above all, additional parts such as an operation switch can be removed from the main body 10, so that the size of the pruning shears can be reduced and the weight can be reduced. Can be achieved.

DESCRIPTION OF SYMBOLS 10 Main body 11 Motor 12 Decelerator 13 Fixed blade 14 Working blade 15 Drive gear 16 Gear part 17 1st Hall sensor 18 2nd Hall sensor 19 Control part 20 Portable operation switch 21 Magnet 22 Support block 23 Rotating ring 24 Fixed tube 25 Cable 26 Power supply section 27 Battery 28 Board 29 Relay 30 Connection jack 31a Iron section 31b Magnet section 32 Reed switch 33 Contact switch 33a Working contact 33b Fixed contact 34 Rotating magnet 35 Plate film 36 Hall sensor type switch 36a, 36b Plate 37 Load cell 38 Hinge pin

Claims (12)

In the electric pruning shears that comprise a fixed blade and an operating blade and perform the pruning work by operating the operating blade with the driving force of the motor,
A contact switch that is installed on one side of the main body for the operation of the motor and is composed of an operating contact and a fixed contact;
A portable operation switch that can be operated by a motor with a separate ring form that can be sandwiched between fingers, and that has an internal magnet and attaches the operating contact and fixed contact of the contact switch magnetically.
An electric pruning shears further comprising:   The electric pruning shears according to claim 1, wherein the operating contact of the contact switch includes a return spring that allows the operating contact of the contact switch to return to a position away from the fixed contact when no magnetic force is applied.   The working blade is coupled to a fixed blade fixed to the main body so that it can be rotated by a hinge pin on one side of the fixed blade, and is formed in a fan shape formed at the rear end of the working blade. The electric pruning shears according to claim 1, wherein the pruning operation is performed by engaging with a drive gear on the monitor side through a gear portion.   4. The electric motor according to claim 1, further comprising a sensor unit that is installed at a hinge pin fastening portion of the working blade and detects a load applied to the working blade in order to prevent overload of the motor. Pruning shears.   The electric pruning shears according to claim 4, wherein the sensor unit is a load cell capable of measuring a resistance change of a strain gauge and detecting a magnitude of a force by an electric signal. A fixed tube installed at the lower end of the main body;
A rotating ring supported so as to be concentrically rotatable on the outer surface of the fixed tube;
A reed switch that is turned on or off by a magnetic force by operating the rotating ring;
The electric pruning shears according to claim 1, further comprising:   The fixed tube and the rotating ring each include an iron part and a magnet part that are embedded and installed on the circumference at regular intervals, and the reed switch is installed adjacent to the iron part of the fixed tube, The electric pruning shears according to claim 1, wherein the reed switch is turned on or off depending on whether or not the magnet part of the rotating ring overlaps the iron part of the fixed tube.   A power supply unit connected by the main body and a cable, and a battery is built inside, a relay installed in the power supply unit, receiving a signal input from the reed switch, and supplying or cutting off power to the cable, The electric pruning shears according to claim 6, characterized by comprising:   A rotating magnet embedded and installed on one side of the working blade, and first and second Hall sensors attached to the rear end of the fixed blade at regular intervals to sense the position of the rotating magnet. The first Hall sensor senses a closed state of the working blade, and the second Hall sensor senses an open state of the working blade to control the reciprocating rotation of the working blade once. Item 1. The electric pruning shears according to Item 1.   The electric pruning shears according to claim 1, further comprising a control unit that is mounted inside the main body and controls general operation and power supply of the motor.   The electric pruning shears according to claim 1, wherein the closed state of the working blade and the fixed blade can be maintained by keeping the portable operation switch in contact with the contact switch for a predetermined time during storage. In the electric pruning shears that have a fixed blade and an operating blade and perform the pruning work by operating the operating blade with the driving force of the motor,
Hall sensor type switch installed on one side of the main body for the operation of the motor,
A portable operation switch that operates the motor by turning on the switch with a magnet by touching the hall sensor type switch with a magnet built in,
Electric pruning shears including

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