JP4677117B2 - Mower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mower. More specifically, in a self-propelled mower having a sub-cutter unit that has a sub-cutter and a part or the whole of which can be opened and closed laterally, the sub-cutter during mowing work. Even if the unit hits an obstacle, the mower will not be prevented from traveling and mowing around the obstacle will be possible, and the driver will not accidentally drive due to the impact. It is related with what can prevent that a cutter unit breaks or damages an obstacle.
[0002]
[Prior art]
Conventionally, as a mower that can cut grass growing near obstacles such as trees, for example, a traveling vehicle has a sub-cutter unit that can be moved to the side by a slide mechanism, and the sub-cutter unit Has a structure in which a sub-cutter is provided.
According to such a mower, the sub cutter unit can be moved to project to the side of the traveling vehicle, and the grass cutter can be operated to cut the grass around the obstacle by the sub cutter.
[0003]
[Problems to be solved by the invention]
However, the conventional mower described above has the following problems:
In other words, during the mowing operation, the sub cutter unit may be brought into contact with an obstacle such as a tree. In addition, the driver was in danger of accidental driving due to the impact. In addition, the sub cutter unit may be damaged or the obstacle may be damaged.
In addition, when mowing while avoiding obstacles, it was necessary to perform twice the trouble of cutting the remaining grass with a mower such as a backpack or spraying herbicide around the roots.
[0004]
(Object of the present invention)
The object of the present invention is that even when the sub-cutter unit hits an obstacle during mowing work, the driving of the mower is not hindered, and the driver does not accidentally drive due to the impact, It is an object of the present invention to provide a mowing machine that can efficiently cut grass around a tree trunk without damaging a sub-cutter unit or damaging an obstacle.
[0005]
  The means of the present invention taken to achieve the above object are as follows.
In the first invention,
  A traveling vehicle having a main cutter, a sub cutter unit that is provided on one or both sides of the traveling vehicle and that can be partially or wholly opened and closed toward the side,
  An air cylinder that opens and closes the sub-cutter unit;
  It is provided on the running direction side when the sub cutter unit is opened to the side.the aboveClose the sub cutter unit inwardOperate the above air cylinderA contact sensor;
A contact sensor that closes the sub-cutter unit inside,
  An operation unit for driving the air cylinder to open and close the sub-cutter unit;
  With
  The operation unit
  An opening / closing lever for opening / closing the sub cutter unit;
  In a normal state, a mechanical valve that sends air to the side where the rod of the air cylinder extends and the switch is pushed and the control circuit is switched, and sends air to the side where the rod of the air cylinder contracts,
  It is provided between the open / close lever and the mechanical valve and is moved by pulling with a wire that conveys the movement of the contact sensor and contact with the open / close lever.RuAn operation plate for pressing the switch of the mechanical valve;
  including,
  It is a mower.
[0006]
In the second invention,
  The operation unit includes an operation lever for operating the forward and backward movements of the mower in addition to the open / close lever, and the operation lever has a structure in which the traveling speed of the mower increases as the distance from the neutral position increases.
  The operation lever is provided with an operation pin that contacts the opening / closing lever when the operation lever is rotated backward.
  When the operation lever is tilted in the backward direction and the reverse speed reaches a predetermined speed, the operation pin provided on the operation lever comes into contact with the opening / closing lever to move the opening / closing lever, and the operation plate pushes the switch to activate the control circuit The rod of the switching air cylinder was shrunk.
  According to the first inventionIt is a mower.
[0011]
A single sub cutter can be provided in the sub cutter unit, or a plurality of sub cutters can be provided.
The structure of the main cutter and the sub cutter is not particularly limited. For example, a structure in which the blade rotates in the horizontal direction or a rotary type (vertical rotation) can be used.
The side on which the sub-cutter unit is provided is not limited to either the left or right side, and may be provided on either the left or right side as required, or on both the left and right sides.
Further, the sub-cutter unit may have a structure that opens and closes as a whole, or a part that does not open and close and the other part that opens and closes.
[0012]
The position where the contact sensor is provided is not particularly limited as long as it is in the traveling direction when the sub cutter unit is opened sideways. For example, it can be provided in the sub-cutter unit or can be provided in the traveling vehicle.
The “traveling direction side” includes the meaning that the traveling vehicle is in front of the sub-cutter unit when moving forward and the rear side of the sub-cutter unit when moving backward.
[0013]
  The driving means is not particularly limited. For example, an actuator capable of obtaining a strong driving force is used. An actuator is a prime mover that uses electricity, hydraulic pressure, compressed air, etc., for example, a hydraulic cylinder-Or air cylinder-For example, a device that performs mechanical work using fluid energy (fluid device), a ball screw type cylinder that uses a motor, and the like are not limited thereto.
[0014]
(Work)
The mower according to the present invention operates as follows.
When mowing the grass around an obstacle such as a tree with a mower, the driving means is operated by operating the operation unit to open the sub-cutter unit and project it to the side of the traveling vehicle. Move the mower forward or backward to mow the grass around the obstacle. Also, if the sub-cutter unit that is open to the side hits an obstacle during work and the work cannot be performed as it is, close the sub-cutter unit to make frequent contact with the obstacle in a short time. Can prevent the sub-cutter unit from being damaged and the obstacles from being damaged.
[0015]
In the case of a device equipped with a contact sensor, when the contact sensor touches an obstacle during mowing work, the driving means is activated, and the sub-cutter unit automatically moves and closes inward. By automatically closing the sub cutter unit, the sub cutter unit does not get in the way even if the traveling vehicle continues to move forward or backward. Moreover, since the sub cutter unit avoids beforehand, it can prevent that a sub cutter unit breaks or damages an obstruction.
As a result, the mowing operation around the obstacle can be performed with high efficiency without obstructing the obstruction and driving of the mower, and the driver is driven by the impact of the collision with the obstacle. There is no danger of accidents causing accidents.
When the sub-cutter unit is closed and the contact with the obstacle of the contact sensor is released, the sub-cutter unit opens automatically or by the operation of the driver, and continuously performs the grass cutting operation between the obstacles. Will be able to. Thereby, smooth mowing work is possible.
[0016]
In the case where the sub-cutter unit is closed when the mower moves backward, the sub-cutter unit can be prevented from being caught by an obstacle or the like when it is moving backward.
That is, the sub-cutter unit does not normally move in the direction opposite to the closing direction in the opened state. For this reason, if the sub cutter unit is retracted with the sub-cutter unit opened and touches an obstacle, the sub-cutter unit may be damaged by receiving a force in a direction in which it cannot move. This situation can also be avoided by closing.
[0017]
If the sub cutter unit is closed when the speed of the mower moves backward exceeds a predetermined speed, the reverse speed will satisfy the predetermined speed when the sub cutter unit is retracted from the open state. If there is no low speed, the sub-cutter unit remains open.
That is, if the predetermined speed is not exceeded when retreating, the sub-cutter unit will not be closed, so that the mowing work can be continued. Therefore, the work efficiency can be improved, and a smoother work can be performed.
[0018]
The sub-cutter unit that can swing in the vertical direction can move up and down along obstacles around the swell and swell of the ground to cut the grass. it can.
[0019]
When the driving means uses an actuator as a prime mover, the driving force is large, and more reliable and smooth opening and closing is possible. In addition, since the response speed when opening and closing can be increased by using an actuator, it is particularly useful when the vehicle speed is increased in order to increase the mowing capability.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in more detail based on embodiments shown in the drawings.
FIG. 1 is a schematic plan view showing an embodiment of a mower according to the present invention,
FIG. 2 is a plan view explanatory view showing a state in which the sub cutter unit is closed,
FIG. 3 is an explanatory plan view showing a state in which the sub cutter unit is opened,
FIG. 4 is a perspective view of the main part of the sub-cutter unit.
FIG. 5 is an explanatory view showing the structure of the contact sensor,
FIG. 6 is a perspective explanatory view showing the structure of the operation unit,
FIG. 7 is an explanatory view showing the operation of the sub-cutter unit. In FIG. 7, illustration of an air cylinder and the like is omitted for convenience. FIG. 6 is a view as seen from diagonally forward right in FIG.
[0021]
  Reference numeral A denotes a mower, which includes a traveling vehicle 1 having a main cutter 10, a sub-cutter unit 2 that can be opened and closed (turned) sideways on one side of the traveling vehicle 1, and a sub-cutter unit 2. Driving air cylinder-3 and air cylinder-3 is provided with an operation unit 4 that opens and closes the sub-cutter unit 2.
  In addition to the main cutter 10, the traveling vehicle 1 includes an engine 11, a travel drive mechanism (not shown), a main cutter drive mechanism (not shown), a seat 12, a handle 13, and the like.
[0022]
The structure of the sub cutter unit 2 will be described. The sub-cutter unit 2 includes a stationary sub-cutter 21 in which the position of the rotating shaft does not move by opening / closing the sub-cutter unit 2 and moving sub-cutters 22 and 23 in which the position of the rotating shaft moves by opening / closing the sub-cutter unit 2. .
Each of the main cutter 10, the stationary sub-cutter 21, and the movable sub-cutters 22 and 23 has a structure having a rotary blade (not shown) that rotates in the horizontal direction. The cutting edges of the cutters are set so that the trajectories overlap so that there is no uncut residue when mowing.
[0023]
The stationary sub-cutter 21 is provided on a base body 20 attached to one side of the traveling vehicle 1 via a hinge 200 so as to be swingable in the vertical direction. The rotating shaft 210 of the stationary sub-cutter 21 is vertically supported by a bearing (not shown), and a pulley 211 is attached to an end protruding to the upper surface of the base body 20. A rotary blade is attached to the lower part of the rotary shaft 210.
The pulley 211 has a groove for the belt B1 that is turned around between the drive pulley (not shown) of the main cutter 10 and a groove for the belt B2 that is turned around between the pulleys of the moving sub-cutters 22 and 23. It is provided in two upper and lower stages.
[0024]
A movable body 24 is rotatably provided on the base body 20. The movable body 24 can be rotated in a certain angular range (about 80 ° in the present embodiment) in the horizontal direction via a bearing (not shown) whose rotation center is the same as that of the rotation shaft 210.
The angle range in which the movable body 24 can be rotated is set as appropriate and is not particularly limited.
The base body 20 and the movable body 24 have a function as a cover that covers the rotary blade. The edge of the movable body 24 is bent downward, and the height of the lower end of the movable body 24 is set to be slightly above the rotary blades of the moving sub-cutters 22 and 23 described later. A rubber plate 240 is suspended from front and rear edges of the movable body 24. The lower end of the rubber plate 240 is set so as to be positioned at substantially the same height as the rotary blades of the movable sub-cutters 22 and 23 (see FIG. 5).
[0025]
The movable sub-cutters 22 and 23 are arranged in parallel in the longitudinal direction of the movable body 24 at a required interval. The rotary shafts 220 and 230 of the moving sub-cutters 22 and 23 are vertically supported by bearings (not shown), and pulleys 221 and 231 are attached to end portions protruding to the upper surface of the movable body 24. A rotary blade is attached to the lower part of the rotary shafts 220 and 230.
The pulleys 221 and 231 are provided with a groove for the belt B <b> 2 that is turned around between the pulleys 211 and 231.
[0026]
A belt B1 is rotated between a driving pulley (not shown) of the main cutter 10 and the pulley 211, and a belt B2 is rotated between the pulley 211 and the pulleys 221, 231. In addition, the fluctuation | variation of the tension | tensile_strength of belt B1 by the base | substrate 20 rock | fluctuating is adjusted suitably by a well-known means.
Further, tension pulleys 25 and 26 are provided near the pulley 221 between the pulley 211 and the pulley 221 and between the pulley 221 and the pulley 231. Thereby, the rotational force of the main cutter 10 is transmitted to the stationary sub cutter 21 and the movable sub cutters 22 and 23 regardless of the angle of the movable body 24.
The sub cutter unit 2 is provided with a cover 28 that covers the pulleys 211, 221, 231 and the belt B2.
[0027]
A contact sensor 27 is provided on the side of the movable body 24 (the traveling direction side when opened) on the front side. In addition, a fixed guard 29 made of metal is provided adjacent to the contact sensor 27 on the base side of the movable body 24. Both end sides of the fixed guard 29 are gently bent toward the movable body 24 side.
The contact sensor 27 includes a movable guard 273 formed by pressing a metal plate. For example, a rubber cushion 274 is provided at the lower end of the movable guard 273 on the outer surface side over the entire width.
[0028]
A rubber cushion plate 277 is attached to the front side surface on the front end side of the movable body 24 to soften the impact when the contact sensor 27 hits.
On the inner surface side of the upper end portion of the movable guard 273, attachment pieces 275 are provided at two locations on both sides. A wire attachment piece 276 is provided on the side (outer surface side) opposite to the attachment piece 275 on the side close to the fixed guard 29.
[0029]
The contact sensor 27 is provided so as to be rotatable by attaching attachment pieces 275 to attachment brackets 270 provided at two locations on both sides of the upper surface of the movable body 24 via shaft pins 272. The mounting bracket 270 is provided with a coil spring 278 obliquely toward the movable guard 273.
The mounting bracket 270 on the side close to the fixed guard 29 is provided with a mounting portion 271 for mounting the wire 45. In the wire 45, the distal end portion of the outer tube 450 is fixed to the attachment portion 271, and the distal end portion of the inner wire 451 is fixed to the wire attachment piece 276.
[0030]
The proximal end side of the wire 45 is extended to the operation unit 4 described later, and the movement of the contact sensor 27 is transmitted to the operation plate 44 described later. The mechanical valve 43 operated by the operation plate 44 controls expansion / contraction of the rod of the air cylinder 3 described later.
The contact sensor 27 is normally pushed by a coil spring 278 and opened at a required angle as shown in FIG. When an external force is applied such as an obstacle hitting the contact sensor 27, the contact sensor 27 rotates to the movable body 24 side, and the inner wire 451 is pulled. The contact sensor 27 returns to the original position by the action of the coil spring 278 when the external force is lost.
[0031]
Between the base body 20 and the movable body 24, an air cylinder 3 constituting a driving means for opening and closing the movable body 24 is provided. The air cylinder 3 is pivotally supported by a pin 30 so that the base end portion of the cylinder can be rotated in the horizontal direction and attached to the base 20, and the tip end portion of the rod is supported by a pin 31 so as to be rotatable in the horizontal direction. It is attached to the body 24.
Thereby, when the rod of the air cylinder 3 is contracted, the sub-cutter unit 2 is closed (see the portion shown by the solid line in FIG. 1 and FIG. 2), and when the rod is extended, the sub-cutter unit 2 is opened (see FIG. 1 and the part represented by the phantom line and FIG. 3).
[0032]
The operation unit 4 is provided on the right side of the seat 12. As shown in FIG. 6, the operation unit 4 includes an operation lever 41 for operating the mowing machine A forward and backward, an opening / closing lever 42 for opening / closing the sub-cutter unit 2, a mechanical valve 43, and an operation plate 44. I have.
The operation plate 44 is provided close to the switch 430 of the mechanical valve 43, and is suspended so as to be rotatable about the upper end portion. The operation plate 44 is connected to the proximal end portion of the inner wire 451 having the distal end portion connected to the contact sensor 27 described above.
[0033]
When the contact sensor 27 is rotated toward the movable body 24, the operation plate 44 is rotated by the pulled inner wire 451 to press the switch 430, and the rod of the air cylinder 3 is contracted by the mechanical valve 43.
Note that the switch 430 is a spring return type switch, and the control circuit is switched when the button is pressed (withdrawn) and when the button is released (withdrawn). Further, the mechanical valve 43 normally sends air to the side where the rod of the air cylinder 3 extends, and when the switch 430 is pressed and the control circuit is switched, the air is sent to the side where the rod of the air cylinder 3 contracts.
[0034]
The opening / closing lever 42 can contact the operation plate 44 by rotating to the operation plate 44 side (arrow a direction), and can rotate the operation plate 44 to the switch 430 side. As a result, the operation plate 44 can press the switch 430 to contract the rod of the air cylinder 3 and close the sub cutter unit 2.
An operation pin 410 that protrudes toward the opening / closing lever 42 is provided at an intermediate portion of the operation lever 41. The operation pin 410 comes into contact with the opening / closing lever 42 when the operation lever 41 is rotated backward.
[0035]
Further, the operation lever 41 has N (neutral) at a substantially upright position. When the operation lever 41 is tilted in the F direction, the mower A moves forward, and when it is tilted in the R direction, the operation lever 41 moves backward. The operating lever 41 has a structure in which the traveling speed increases as the distance from the N (neutral) increases (the inclination angle increases).
According to this structure, when the operation lever 41 is tilted in the R direction and the reverse speed reaches a predetermined speed, the operation pin 410 contacts the opening / closing lever 42 to move the opening / closing lever 42, and the opening / closing lever 42 moves the operation plate 44. When the switch 430 is pushed and the control circuit is switched, the rod of the air cylinder 3 is contracted.
The timing at which the operation pin 410 and the opening / closing lever 42 come into contact with each other can be set to the N (neutral) position of the operation lever 41. Further, the opening / closing lever 42 may be structured to be fixed at a position where the sub cutter unit 2 is closed.
[0036]
(Function)
The operation of the mower A will be described with reference to FIGS.
When the mower A drives the prime mover, air is sent to the air cylinder 3, the rod extends, and the sub-cutter unit 2 opens. When the vehicle is parked or travels, the sub cutter unit 2 is closed as necessary by operating the opening / closing lever 42 (see FIGS. 1 and 2).
When the grass cutter A cuts grass around an obstacle such as a tree, for example, the opening / closing lever 42 is operated to release the pressure of the switch 430 and the rod of the air cylinder 3 is extended by the mechanical valve 43. The cutter unit 2 is opened and protruded to the side of the traveling vehicle 1 (see FIGS. 1 and 3).
Thus, the sub-cutter unit 2 is opened by the air cylinder 3. Then, the operator drives the mower A to mow the grass around an obstacle such as a tree. Since the sub-cutter unit 2 can be swung in the vertical direction, it can move up and down along the rise and swell of the ground to mow the grass even around obstacles such as trees, so there is little uncutting and mowing Work is highly efficient.
[0037]
The operation of the sub cutter unit 2 will be described with reference to FIG.
During the mowing operation, when the tree W that is an obstacle approaches (see FIG. 7A) and the contact sensor 27 touches the tree W, the contact sensor 27 rotates to the movable body 24 side, and the inner wire 45 The operation plate 44 pulled by the wire 451 rotates, and the switch 430 of the mechanical valve 43 is pushed, so that the control circuit is switched. As a result, the air cylinder 3 is operated and the rod is contracted, whereby the sub cutter unit 2 is rotated inward and closed.
When the tree W is slightly close to the traveling vehicle 1, the tree W comes into contact with the fixed guard 29 even when the sub cutter unit 2 is closed (see FIG. 7B).
Further, when the traveling vehicle 1 travels, the tree W does not hit the side of the contact sensor 27 due to the action of the fixed guard 29, and the contact sensor 27 is pushed by the tree W and can be turned inward to escape. (See FIG. 7C). Thereby, damage to the contact sensor 27 can be prevented.
[0038]
In this way, the sub-cutter unit 2 can pass through the tree W, and the tree W does not get in the way and the travel of the mower A is not hindered. Since the sub cutter unit 2 is driven by an air cylinder having a large driving force, the sub cutter unit 2 closes quickly and there is almost no impact caused by contact with an obstacle. For this reason, the mowing operation can be continuously performed with high efficiency, and there is no danger that the driver accidentally causes an accident by driving.
Further, since the sub cutter unit 2 automatically closes when the contact sensor 27 touches the obstacle, it is possible to prevent the sub cutter unit 2 from being damaged or scratching the obstacle.
Then, when the sub cutter unit 2 passes through the tree W, the contact sensor 27 returns to the original state, the pressure of the switch 430 is released, the rod of the air cylinder 3 extends, and the sub cutter unit 2 opens as it was. . Thereby, the mowing work around obstacles, such as the tree W, can be performed continuously.
[0039]
Further, when the sub-cutter unit 2 automatically closes when the mower A moves backward, for example, when the sub-cutter unit 2 is opened, the sub-cutter unit 2 is moved backward when moving on a wavy road surface or the like. Although there is a possibility that a force in a direction in which 2 cannot move is received from the road surface and it may be damaged, such a situation can be avoided by closing the sub-cutter unit 2 when moving backward.
[0040]
Further, when the sub cutter unit 2 is retracted with the sub cutter unit 2 opened, if the sub cutter unit 2 cannot be closed if the reverse speed is less than a predetermined speed, an obstacle such as a tree W can be used. If the predetermined speed is not exceeded during a short retreat, such as a change of direction in a place where there is not, the sub-cutter unit 2 will not be closed, and a higher efficiency can be achieved when the above mowing operation is continued. Makes smooth work possible.
[0041]
Note that the terms and expressions used in the present specification are merely explanatory and not restrictive, and do not exclude terms and expressions equivalent to the above terms and expressions. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the technical idea.
[0042]
【The invention's effect】
The mower according to the present invention has the following effects.
(A) When mowing the grass around an obstacle such as a tree with a mower, if the sub-cutter unit that is open to the side hits the obstacle and you cannot work as it is, remove the sub-cutter unit. If it is closed, it is possible to prevent the sub-cutter unit from being damaged or damaged from being damaged by frequent contact with the obstacle in a short time.
[0043]
(B) In a device provided with a contact sensor, when the contact sensor touches an obstacle during mowing work, the driving means is activated, and the sub-cutter unit automatically moves and closes inward. By automatically closing the sub cutter unit, the sub cutter unit does not get in the way even if the traveling vehicle continues to move forward or backward. Moreover, since the sub cutter unit avoids beforehand, it can prevent that a sub cutter unit breaks or damages an obstruction.
As a result, the mowing operation around the obstacle can be performed with high efficiency without obstructing the obstruction and driving of the mower, and the driver is driven by the impact of the collision with the obstacle. There is no danger of accidents causing accidents.
[0044]
(C) When the sub cutter unit is closed when the mower moves backward, the sub cutter unit can be prevented from being caught by an obstacle or the like when the sub cutter unit is retracted.
[0045]
(D) When the speed at which the mower moves backward exceeds a predetermined speed, when the sub cutter unit is closed, when the sub cutter unit is retracted from the open state, the reverse speed is predetermined. If the speed is less than the speed, the sub-cutter unit remains open.
That is, if the predetermined speed is not exceeded when retreating, the sub-cutter unit will not be closed, so that the mowing work can be continued. Therefore, the work efficiency can be improved, and a smoother work can be performed.
[0046]
(E) A sub cutter unit that can swing in the vertical direction can move up and down along the rise and swell of the ground to mow the grass even around obstacles, so there is little uncutting and mowing work Highly efficient.
[0047]
(F) Since the driving means using the actuator as the prime mover has a large driving force, the sub-cutter unit can be opened and closed more reliably and smoothly.
In addition, since the response speed when opening and closing can be increased by using an actuator, it is particularly useful when the vehicle speed is increased in order to increase the mowing capability.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing an embodiment of a mower according to the present invention.
FIG. 2 is an explanatory plan view showing a state in which a sub cutter unit is closed.
FIG. 3 is an explanatory plan view showing a state in which a sub cutter unit is opened.
FIG. 4 is a perspective view illustrating a main part of a sub cutter unit.
FIG. 5 is an explanatory view showing a structure of a contact sensor.
FIG. 6 is a perspective explanatory view showing a structure of an operation unit.
FIG. 7 is an explanatory view showing the operation of the sub-cutter unit.
[Explanation of symbols]
A Mower
1 traveling vehicle
10 Main cutter
11 engine
12 seats
13 Handle
2 Sub cutter unit
20 substrate
200 Hinge
21 fixed sub cutter
210 Rotating shaft
211 pulley
22 Moving sub cutter
220 Rotating shaft
221 pulley
23 Moving sub cutter
230 Rotating shaft
231 pulley
B1, B2 belt
24 Movable body
240 Rubber plate
25, 26 Tension pulley
27 Contact sensor
270 Mounting bracket
271 Mounting part
272 shaft pin
273 Movable guard
274 cushion
275 Mounting piece
276 Wire mounting piece
277 Cushion board
278 Coil spring
28 Cover
29 Fixed guard
3 Air cylinder
30, 31 pins
4 Operation part
41 Control lever
410 Operation pin
42 Opening and closing lever
43 Mechanical valve
430 switch
44 Operation panel
45 wire
450 outer tube
451 inner wire

Claims (2)

A traveling vehicle (1) having a main cutter (10), and a sub-cutter unit (2) that is provided on one or both sides of the traveling vehicle (1) and that can be partially or wholly opened and closed toward the side. When,
An air cylinder (3) that opens and closes the sub-cutter unit (2); and
The sub cutter unit (2) is provided in the traveling direction side when opening laterally, actuate the air cylinder to close the obstacle touches the sub cutter unit (2) on the inside (3) A contact sensor (27);
An operation unit (4) for driving the air cylinder (3) to open and close the sub-cutter unit (2);
With
The operation unit (4)
An open / close lever (42) for opening and closing the sub cutter unit (2);
In a normal state, air is sent to the side where the rod of the air cylinder (3) is extended, and when the switch (430) is pressed and the control circuit is switched, a mechanical valve that sends air to the side where the rod of the air cylinder (3) contracts ( 43)
The opening / closing lever (42) and the mechanical valve (43) are provided between the contact sensor (27) and are pulled by a wire (45) and moved by contact with the opening / closing lever (42). An operation plate (44) that presses the switch (430) of the mechanical valve (43),
including,
Mower. The operation unit (4) includes an operation lever (41) for operating the forward and backward movements of the mower in addition to the open / close lever (42), and the operation lever (41) travels away from the neutral position. It has a structure that speeds up,
The operation lever (41) is provided with an operation pin (410) that contacts the open / close lever (42) when the operation lever (41) is rotated backward.
When the operation lever (41) is tilted in the reverse direction and the reverse speed reaches a predetermined speed, the operation pin (410) provided on the operation lever (41) contacts the open / close lever (42) and the open / close lever (42 ), And the operation plate (44) presses the switch (430) to switch the control circuit so that the rod of the air cylinder (3) is retracted.
The mower according to claim 1.

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