WO2016114505A1

WO2016114505A1 - Electric pruning shears

Info

Publication number: WO2016114505A1
Application number: PCT/KR2015/013885
Authority: WO
Inventors: 한운선
Original assignee: 한운선
Priority date: 2015-01-16
Filing date: 2015-12-17
Publication date: 2016-07-21
Also published as: CN205266388U; KR101535295B1

Abstract

The present invention relates to electric pruning shears comprising: a case having a mounting space formed therein; a pipe part which, on one side thereof, is installed in a support pipe extending from the case, and is formed so as to have an adjustable length; a cutting unit including a fixing blade fixed to an end of the pipe part, and a cutting blade rotatably coupled to the fixing blade so as to cut a branch of a tree together with the fixing blade; a driving unit including a driving motor installed inside the case, and a power conversion unit coupled to one side of the driving motor so as to convert a rotational motion of the driving motor into a linear motion; an operation unit including a switch unit for selecting the rotation direction of the driving motor, and a control unit for controlling an operation of the driving motor according to the operation of the switch unit; a power transmission unit which is coupled to the driving unit on one side thereof and is coupled to the cutting blade on the other side thereof, and transfers power generated by the driving unit to the cutting blade such that the cutting unit can perform a cutting operation or a releasing operation according to an operation state of the driving unit; and a battery unit for supplying power to the driving unit.

Description

Electric pruning shears

The present invention relates to electric pruning shears, and more particularly, to electric pruning shears that can easily and easily pruning fruit trees or other trees by securing the cutting force necessary to cut thick branches in high places.

In general, a variety of cutting tools are used to prun the trees in order to help the fruit tree, landscaping or forestry to grow fruitful, ornamental or other trees, and to harvest a strong and large fruit.

The most widely used among the conventional cutting tools as described above is a pair of shears, the shears protrude so as to cut a branch with a support blade body having an arc-shaped support blade inserted into the tip side, and the support blade. A cutting blade body having a circular arc-shaped cutting blade is provided, and the cutting blade body is freely moved by rotatably coupling the cutting blade body with respect to the support blade body.

The handle is fixed to the rear of the support blade body and the cutting blade body so that the operator can hold the hand by hand and apply pressure necessary for cutting, and the support blade and the cutting blade are not bite to each other after the cutting, that is, in an open state. Install and configure a restoring spring so that it can be restored.

Since the above-described conventional scissors are manually made by the operator's grip, fatigue is accumulated in the operator's hand, which causes a problem that the efficiency of the battery operation is lowered.

In order to solve this problem, various types of electric pruning shears have been developed and used recently using electric motors. Among them, automatic pruning shears are disclosed in Korean Utility Model Registration No. 20-0416812.

The automatic pruning shear is connected to the rear of the pedestal and the motor is operated by receiving external power, the fixed blade is connected to the front of the pedestal via a fixing bracket, and the fixed blade side can be rotated in a pin structure A movable blade coupled to each other, a rotary disc rotatably mounted on the upper portion of the pedestal, one end of which is connected to one side of the edge of the rotary disc, and the other end of which is connected to the rear of the movable blade; It is composed of a gear transmission connected to the rear to transmit the power of the motor to the rotating disk.

Automatic pruning shears with such a configuration are relatively large and heavy in weight compared to commonly used pruning shears, and are not suitable for battery work requiring long hours of work. Becomes

In addition, since the cutting of the branch is performed solely by electric movement, when the branch is large, it is not possible to cut it frequently, and in this process, even if the worker tries to add power by hand, Since there is no handle at all, there are various problems, such as a significant drop in efficiency compared to battery operation performed by hand.

The present invention is to solve the conventional problems as described above, it is an object of the present invention to provide electric pruning shears that can improve the work efficiency by reducing the fatigue of the operator.

Electric pruning shears according to the present invention for achieving the above object is provided with a mounting space therein; A pipe part rotatably installed on one side of the support pipe extending from the case and adjustable in length; A cutting part including a fixed blade fixed to an end of the pipe part, and a cutting blade rotatably coupled to the fixed blade so as to cut branches together with the fixed blade; A driving unit including a driving motor installed inside the case and a power converter coupled to one side of the driving motor to convert the rotational motion of the driving motor into a linear motion; An operation unit including a switch unit for selecting a rotation direction of the drive motor, and a control unit controlling an operation of the drive motor according to an operation of the switch unit; One side is coupled to the drive unit and the other side is coupled to the cutting blade to transfer power generated by the drive unit to the cutting blade so that the cutting unit may perform a cutting operation or an unwinding operation according to the operating state of the driving unit. A power transmission unit; And a battery unit supplying power to the driving unit.

The pipe part enters the inside of the first pipe in a state in which one side is rotatably installed in the support pipe and one side is inserted into the other side of the first pipe, or out of the first pipe. A second pipe which is installed to be movable and an end portion of the first pipe, which is installed at an end of the first pipe and interferes with the second pipe or prevents the second pipe from slidingly moving with respect to the first pipe according to an operator's manipulation; And a position fixing part for releasing interference to the second pipe such that the second pipe is slidably movable with respect to one pipe, wherein the power transmission unit rotates the drive motor in one direction through the operation unit. Advancing toward the cutting part along the part and rotating the driving motor in the other direction, the driving part along the pipe part; It is to be retracted toward, the one end is fixed to the power conversion portion and the other end is a first power transmission rod extending along the inside of the first pipe, the relay portion fixed to the other end of the first power transmission rod and One side is fixed to the cutting blade and the other side extends into the first pipe, and one side interferes with the relay or the relay so as to move forward or backward with the relay according to the manipulation of the position fixing unit. And a second power transmission rod for releasing interference from the relay portion so as to move forward or backward separately from the portion, wherein the relay portion has a through hole formed along the longitudinal direction to allow the second power transmission rod to pass therethrough. A relay body disposed inside the pipe portion corresponding to the position fixing portion, and rotatably installed on an upper portion of the relay body to be lowered by the position fixing portion; During the time of rotation and interfere with the second power transmission rod rotated upward by the position fixing section is characterized in that it comprises a lever that interference is interference on the second power transmission eject.

The interference lever is provided with an interference rod installed in a horizontal direction, and an upper portion of the second power transmission rod has an inlet groove drawn downward so that the interference rod can be inserted when the interference lever rotates downward. Characterized in that spaced apart a predetermined interval along the longitudinal direction of the transfer rod.

A screw thread is formed at an end portion of the first power transmission rod fixed to the power converter along the longitudinal direction, and rotatably supports the first pipe with respect to the support pipe between the support pipe and the first pipe. And a rotation support part for preventing the first pipe from being separated from the support pipe, and a rotation limit part for limiting the rotation of the first pipe within a predetermined angle at a position spaced apart from the rotation support part.

And a gripping portion provided at the cutting portion so that the branch cut by the cutting portion may be gripped by the cutting operation of the cutting blade during the cutting operation of the cutting portion.

The power conversion unit is installed in a first position that is a forward limiting position of the advance and retraction rod for limiting the moving range of the advance and retraction rod and the retraction rod in the case according to the rotation direction of the drive unit; And a limit switch and a second limit switch installed at a second position which is a retreat limit position of the advance rod, wherein the control unit drives the drive when the advance rod reaches the first limit switch or the second limit switch. And to stop the motor.

The inside of the case is further provided with a micro switch for detecting that the drive unit flows in the interior of the case more than a set range by the reaction force transmitted from the power transmission unit during the cutting operation of the cutting unit, the control unit is the micro When the drive unit is separated from the switch is characterized in that to stop the drive motor.

Electric pruning shears according to the present invention can reduce the fatigue of the operator by applying a motor as a power source, improve the work efficiency, and protect the motor through the first limit switch, the second limit switch and the micro switch This has the advantage of easy maintenance.

1 is a perspective view showing the electric pruning shears according to the present invention.

Figure 2 is an exploded perspective view of the electric pruning shears according to the present invention shown in FIG.

3 is a partial perspective view of the electric pruning shears according to the present invention shown in FIG.

Figure 4 is a partial perspective view showing a power transmission unit of the electric pruning shears according to the present invention shown in FIG.

5 is a side view showing a power transmission unit of the electric pruning shears according to the present invention shown in FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the electric pruning shears according to an embodiment of the present invention.

1 to 5 are shown the electric pruning shears according to the present invention. 1 to 5, the electric pruning shears 1 according to the present invention includes a case 100; A pipe part 200; Cutting unit 300; A driving unit 400; An operation unit 500; A power transmission unit; It includes a battery unit 700.

As shown in FIG. 1, the case 100 includes a left case 110 and a right case 120 to form a mounting space for mounting the driving unit 400 therein. The case 100 has a main body formed in a rectangular parallelepiped shape, and a support pipe 130 extending to one side from the main body and having a hollow portion provided therein. The pipe portion 200 to be described later is rotatably installed on the support pipe 130.

The pipe part 200 is rotatably installed on one side of the support pipe 130 extending from the case 100 and adjustable in length, and includes a first pipe 210 and a second pipe 220. And position fixing part 230.

One end of the first pipe 210 is rotatably installed at the support pipe 130, and the first pipe 210 is disposed between the first pipe 210 and the support pipe 130. While rotatably supporting the support pipe 130, the rotation support part 211 is installed to prevent the first pipe 210 from being separated from the support pipe 130 and spaced apart from the rotation support part 211. The rotation limiter 221 is provided at the position to limit the rotation of the first pipe 210 to within the set angle.

The rotation support part 211 is disposed along the end circumferential surface of the first pipe 210 and is spaced apart by a predetermined interval and is formed in a semicircular shape, and an inner circumferential surface of the support pipe 130 corresponding to the first protrusion. It is formed to include a first guide groove for guiding the first projection.

The rotation limiting part 221 is disposed to be spaced apart from the rotation support part 211 by a predetermined distance in a direction far from the end side side case 100 of the pipe part 200, and the second projection formed in a semi-circular shape, And a second guide groove formed on an inner circumferential surface of the support pipe 130 corresponding to the second protrusion to guide the first protrusion, wherein the second guide groove is based on the center of the support pipe 130. It is formed to be able to rotate by a set angle. For example, the second guide groove may be formed to be rotatable by 90 ° in the left and right direction by 90 °, ie, 180 ° when rotating from one end to the other end, which may be variously changed. to be.

The second pipe 220 is provided with a cutting portion 300 to be described later in the end, the other end of the first pipe 210 of the first pipe 210 in a state where a predetermined length is inserted into the other side of the first pipe 210 It is installed to enter the interior or the exterior of the first pipe 210. The second pipe 220 is slidably movable with respect to the first pipe 210 and may be fixed by a position fixing unit 230 to be described later.

On the outer peripheral surface of the upper side adjacent to the end side of the second pipe 220, fixing grooves penetrating up and down are formed to be spaced apart by a predetermined distance along the longitudinal direction of the second pipe 220, and through the position fixing portion 230 Its length can be adjusted freely.

The position fixing part 230 is installed at the end of the first pipe 210 and the second pipe 220 to prevent the sliding movement with respect to the first pipe 210 according to the operator's operation Interfering with the second pipe 220 or to release the interference to the second pipe 220 so that the second pipe 220 is movable sliding relative to the first pipe (210).

The position fixing part 230 is a coupler 231 fixed to a position where the first pipe 210 and the second pipe 220 are bound, and the second pipe 220 is rotatably installed on the coupler 231. It includes an adjusting unit 232 including a fixing pin 233 to enter the fixing groove formed in the). The adjusting unit 232 is normally maintained while the fixing pin 233 enters the fixing groove of the second pipe 220, the operator presses the other side, the fixing pin 233 is raised while the second pipe 220 Is released from the fixing groove of the first pipe 210 to release the fixed state of the second pipe (220).

The cutting part 300 is installed at the end of the second pipe 220 to cut the tree to be cut, the fixed blade 310 fixed to the end of the second pipe 220, part 200, It includes a cutting blade 320 rotatably coupled to the fixed blade 310 to cut the branches with the fixed blade 310.

The fixed blade 310 has a concave blade is formed downward, the cutting blade 320 is convex downward formed a blade between the fixed blade 310 and the cutting blade 320 fixed blades When the cutting blade 320 is rotated downward with respect to 310, the tree branches are cut. The cut portion 300 is formed in a shape similar to the conventional scissors (1) used.

The fixed blade 310 is fixed to the end of the second pipe 220 through a separate bracket, the cutting blade 320 is rotatably mounted to the fixed blade 310 by a hinge, one side will be described later The power transmission unit is fixed.

In addition, the cutout part 300 has a cutting part 300 so as to hold a branch cut by the cutout part 300 until an open operation of the cutting blade 320. Installed grip portion 330; is further provided.

The gripping portion 330 includes a lower portion 331 fixed to the fixed blade 310 side, and an upper portion 332 fixed to the cutting blade 320 side, the upper side 332 is the cutting It is elastically rotatably coupled to the blade 320 side to hold the branches together with the lower side 331 before the cutting blade 320 of the cutting unit 300 during the cutting operation of the cutting unit 300. The gripping portion 330 can be omitted if necessary.

The drive unit 400 is coupled to one side of the drive motor 410 and the drive motor 410 installed inside the case 100, the power to convert the rotational movement of the drive motor 410 to linear motion The conversion unit 420 is included. The power converter 420 is coupled to the gear box 441 and the gear box 441 including the gear members coupled to the drive motor 410 is able to move forward or backward in accordance with the rotation direction of the gear members A retraction rod 442.

One side of the power transmission unit is coupled to the driving unit 400 and the other side is coupled to the cutting blade 320 to perform the cutting operation or the loosening operation of the cutting unit 300 according to the operating state of the driving unit 400. In order to be able to transmit the power generated in the drive unit 400 to the cutting blade (320).

When the power transmission unit rotates the drive motor 410 in one direction through the operation unit 500, the power transmission unit moves forward toward the cutting unit 300 along the pipe part 200 and receives the drive motor 410. As it is rotated in the lateral direction toward the driving unit 400 along the pipe portion 200, the first power transmission rod 310, the relay unit 630, and the second power transmission rod 620 ) Is configured to include.

The first power transmission rod 310 is screwed to the end side of the advancing rod 442 of the power converter 420, the other end extends along the inside of the first pipe (210).

The relay unit 630 is fixed to the other end of the first power transmission rod 310, and is configured to include a relay body 631, an interference lever 632, and an elastic spring 633.

The relay body 631 has a through hole formed along a longitudinal direction of the second power transmission rod 620 so as to pass therethrough, and is disposed inside the pipe part 200 corresponding to the position fixing part 230. It is. Rib grooves are formed at both sides of the relay body 631 so that interference ribs formed in the first pipe 210 and the second pipe 220 may be inserted, and the relay body 631 has the rib groove in the rib groove. It is coupled to the pipe part 200 to be inserted into the pipe part 200 is prevented from rotating inside the pipe part 200.

The interference lever 632 is rotatably installed on the bracket provided on the upper portion of the relay body 631, and the rear end is coupled to the other end of the restoration spring having one end fixed to the relay body 631. The interference lever 632 is rotated downward by pressing the upper surface of the one side while the fixing pin 233 of the position fixing portion 230 is moved downward, to the second power transmission rod 620 when rotated downward Are interfering. On the other hand, the interference lever 632 is rotated upward while one side of the fixing pin 233 of the position fixing part 230 is released upward while the pressing state by the fixing pin 233 is released, and rotates upward When the interference to the second power transmission rod 620 is released.

One side of the interference lever 632 is provided with an interference rod 634 installed in a horizontal direction to interfere with the second power transmission rod 620.

One side of the second power transmission rod 620 is fixed to the cutting blade 320 and the other side of the second power transmission rod 620 extends into the first pipe 210. Interference is released from the relay unit 630 so that one side may interfere with the relay unit 630 or move forward or retracts separately from the relay unit 630 so as to move forward or retract with the 630.

On the upper portion of the second power transmission rod 620, the inlet grooves 621 drawn downward so that the interference rod 634 is inserted when the interference lever 632 rotates downward, the second power transmission rod. It is formed to be spaced apart a predetermined interval along the longitudinal direction of (620).

The operation unit 500 includes a switch unit for the operator to select the rotation direction of the drive motor 410, and a control unit for controlling the operation of the drive motor 410 according to the operation of the switch unit.

The switch unit includes a cutting switch for rotating the drive motor 410 to one side so that the cutting unit 300 performs a cutting operation, an unwinding switch for rotating the driving motor 410 to the other side to perform an unwinding operation, and the driving. It includes a stop switch for stopping the operation of the motor 410.

The battery unit 700 supplies power to the driving unit 400 and the operation unit 500, and is mounted on one side of the case 100 and is capable of being charged.

In the electric pruning shears 1 according to the present embodiment, when the power transmission unit moves to the rear side along the pipe unit 200, that is, toward the driving unit 400, a cutting operation is performed in the cutting unit 300. In the case of moving toward the front side, that is, moving toward the cutting unit 300, the cutting unit 300 has been applied to perform the unwinding operation.

On the other hand, although the electric pruning shears 1 according to the present invention are not shown in the drawing, the maximum of the retraction rod 442 is limited in order to limit the moving range of the retraction rod 442 provided in the power converter 420. And a first limit switch installed at a first position which is a forward limit position, and a second limit switch installed at a second position which is a maximum retraction limit position of the forward and backward rod 442, wherein the control unit includes the first limit switch. When the advancing rod 442 reaches the switch or the second limit switch, the driving motor 410 is stopped to prevent the load from being generated on the driving motor 410. The position of the first limit switch may be variously changed when it is necessary to adjust the cutting force of the cutting unit 300.

In addition, the electric pruning shears 1 according to the present invention are transferred from the power transmission unit during the cutting operation of the cutting unit 300 inside the case 100 in order to prevent the load from occurring in the driving unit 400. The micro switch is further provided to detect that the driving unit 400 flows (moves toward the front of the case) within the case 100 by a reaction force which is greater than a set range. The micro switch is fixed at a position set inside the case 100, and the driving unit 400 is installed to be in contact with the micro switch, that is, to press the micro switch.

The control unit is configured to stop the driving motor 410 when the driving unit 400 is separated from the micro switch, that is, when the contact state with the micro switch is released. That is, when the tree branches are not cut and stagnated, or the state of being unable to cut is continuously maintained during the cutting operation of the cutting unit 300, the driving motor 410 to prevent the load from occurring in advance. ) Is to stop.

In addition, the inside of the case 100 is provided with a cutting force adjusting unit 800 to adjust the cutting force of the cutting unit 300. The cutting force adjusting unit 800 is a fixing plate fitted to the mounting portion integrally formed on one side inside the case 100 between the driving unit 400 and the case 100, the end is installed so as to penetrate through the fixing plate It includes an adjustment bolt screwed in, and an elastic spring is installed between the adjustment bolt and the fixed plate to continuously bias the drive unit 400 toward the rear side of the case 100 with respect to the fixed plate.

Since the adjusting bolt is coupled to the driving unit 400 and the adjusting bolt is continuously biased toward the rear side of the case 100 by the elastic spring, the driving unit 400 also includes the case 100. It becomes the state which elastically biases to the rear side of. In this state, when the adjusting bolt is tightened with respect to the fixing plate, the elastic spring has a force biasing the adjusting bolt larger than the previous state, so that the driving part 400 moves forward from the inside of the case to the front side during the cutting operation of the cutting part 300. It will be difficult to move. That is, it becomes difficult for the driving unit 400 to be separated from the microswitch fixed at the set position inside the case 100, thereby increasing the cutting force of the cutting unit 300.

On the other hand, if the loosening the adjustment bolt against the fixed plate is performed in the elastic spring is a force biasing the adjustment bolt is smaller than the previous state, so the drive unit 400 is cut in the case 100 during the cutting operation of the cutting unit 300 It is easy to move forward. That is, the driving force of the cutting unit 400 is easily separated from the microswitch fixed to the set position inside the case 100, and the cutting force of the cutting unit 300 is reduced.

As described above, the electric pruning shears according to the present invention have the advantage of freely adjusting the cutting force of the cutting portion through the cutting force adjusting unit.

In addition, the electric pruning shears according to the present invention can reduce the fatigue of the operator by applying the motor as a power source, improve the work efficiency, and protect the motor through the first limit switch, the second limit switch and the micro switch. It has the advantage of easy maintenance.

The electric pruning shears according to the present invention described above have been described with reference to an example shown in the drawings, but this is merely exemplary, and those skilled in the art may have various modifications and equivalent embodiments therefrom. I understand that it is possible. Therefore, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

Claims

A case provided with a mounting space therein;

A pipe part rotatably installed on one side of the support pipe extending from the case and adjustable in length;

A cutting part including a fixed blade fixed to an end of the pipe part, and a cutting blade rotatably coupled to the fixed blade so as to cut branches together with the fixed blade;

A driving unit including a driving motor installed inside the case and a power converter coupled to one side of the driving motor to convert the rotational motion of the driving motor into a linear motion;

An operation unit including a switch unit for selecting a rotation direction of the drive motor, and a control unit controlling an operation of the drive motor according to an operation of the switch unit;

One side is coupled to the drive unit and the other side is coupled to the cutting blade to transfer power generated by the drive unit to the cutting blade so that the cutting unit may perform a cutting operation or an unwinding operation according to the operating state of the driving unit. A power transmission unit;

And a battery unit supplying power to the driving unit.

The pipe part enters the inside of the first pipe in a state in which one side is rotatably installed in the support pipe and one side is inserted into the other side of the first pipe, or out of the first pipe. A second pipe which is installed to be movable and an end portion of the first pipe, which is installed at an end of the first pipe and interferes with the second pipe or prevents the second pipe from slidingly moving with respect to the first pipe according to an operator's manipulation; And a position fixing part for releasing interference to the second pipe such that the second pipe is slidably movable relative to one pipe.

The power transmission unit advances toward the cutting part along the pipe part when the driving motor is rotated in one direction through the operation part and retracts toward the driving part along the pipe part when the driving motor is rotated in the other direction. As one end, the one end is fixed to the power conversion unit and the other end is a first power transmission rod extending along the inside of the first pipe, a relay unit fixed to the other end of the first power transmission rod, the cutting One side is fixed to the blade and the other side extends into the first pipe and one side interferes with the relay unit or is separated from the relay unit so as to move forward or backward with the relay unit according to the manipulation of the position fixing unit. And a second power transmission rod for releasing interference from the relay unit so as to move forward or backward with

The relay unit has a transit hole formed along a longitudinal direction to allow the second power transmission rod to pass therethrough, the relay body being disposed inside the pipe part corresponding to the position fixing unit, and rotatably on an upper portion of the relay body. And an interference lever installed to interfere with the second power transmission rod when rotating downward by the position fixing unit, and to interfere with the second power transmission rod when rotating upward by the position fixing unit. Electric pruning shears.
The method of claim 1,

The interference lever is provided with an interference rod installed in a horizontal direction,

In the upper portion of the second power transmission rod is characterized in that the inlet recess downwardly inserted in the longitudinal direction of the second power transmission rod spaced apart so that the interference rod is inserted when the interference lever rotates downward. Electric pruning shears.
The method of claim 1,

The end of the first power transmission rod fixed to the power converter is formed with a thread along the longitudinal direction,

A rotation support portion between the support pipe and the first pipe to rotatably support the first pipe with respect to the support pipe and to prevent the first pipe from being separated from the support pipe, and a position spaced apart from the rotation support part Electric pruning shears, characterized in that it further comprises a rotation limiting unit for limiting the rotation of the first pipe within a set angle.
The method of claim 1,

And a holding part provided on the cutting part to hold a branch cut by the cutting part until the cutting operation of the cutting blade when the cutting part is cut.
The method of claim 1,

The power conversion unit is installed in a first position that is a forward limiting position of the advance and retraction rod for limiting the moving range of the advance and retraction rod and the retraction rod in the case according to the rotation direction of the drive unit; A limit switch, and a second limit switch installed at a second position which is a retreat restriction position of the advance and reverse rod,

And the control unit stops the driving motor when the advancing rod reaches the first limit switch or the second limit switch.
A case provided with a mounting space therein;

A pipe part rotatably installed on one side of the support pipe extending from the case and adjustable in length;

A cutting part including a fixed blade fixed to an end of the pipe part, and a cutting blade rotatably coupled to the fixed blade so as to cut branches together with the fixed blade;

A driving unit including a driving motor installed inside the case and a power converter coupled to one side of the driving motor to convert the rotational motion of the driving motor into a linear motion;

An operation unit including a switch unit for selecting a rotation direction of the drive motor, and a control unit controlling an operation of the drive motor according to an operation of the switch unit;

One side is coupled to the drive unit and the other side is coupled to the cutting blade to transfer power generated by the drive unit to the cutting blade so that the cutting unit may perform a cutting operation or an unwinding operation according to the operating state of the driving unit. A power transmission unit;

And a battery unit supplying power to the driving unit.

The inside of the case is further provided with a micro switch for detecting the flow of the drive in the case more than the set range by the reaction force transmitted from the power transmission unit during the cutting operation of the cutting unit,

And the control unit stops the driving motor when the driving unit is separated from the micro switch.