JPH1146541A - Riding lawn mower - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To rationally configure a lawn mower that does not need to increase the overlapping amount of the mowing areas of a plurality of reel mowers. A first arm (33) and left and right second arms (34) are swingable about an axis (X) in a lateral posture with respect to a traveling body.
The swing arm of the first arm 33 supports the reel mower 6 at the central position, the swing arms of the left and right second arms 34, 34 support the reel mowers 6, 6, respectively. , 6, and 6 are arranged so that a part of the cutting width overlaps.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel mower provided at a central position in the left-right direction of a front portion of a traveling machine body and a reel mower provided at the left-right position such that a part of each cutting width is overlapped. In addition, the present invention relates to a riding lawn mower in which each reel mower is supported by a traveling body so as to be able to move up and down via a drive elevating mechanism, and more particularly, to an improvement in a support form of the reel mower.

[0002]

2. Description of the Related Art A riding lawn mower constructed as described above is disclosed in Japanese Unexamined Patent Publication No. Hei 5-328813. In this conventional example, an axis centered laterally to a front position of a traveling body is disclosed. A support frame 16 in a front-rear position is provided so as to swing forward and backward, and a reel mower 9a at a center position with respect to a front end position of the support frame 16 is provided.
And left and right swing arms 19 and 20 at an intermediate portion of the support frame 16 so as to be swingable around an axis in a front-rear posture.
And supports the reel mowers 9b and 9c at the left and right positions with respect to the outer end positions of the left and right swing arms 19 and 20.

[0003]

Considering the working mode of a riding lawn mower having a plurality of reel mowers, in this type of lawn mower, each reel mower is provided with a grounding wheel so as to allow the reel mower to move up and down. Since the support system is configured, when there is unevenness on the ground, the reel mower is vertically displaced in accordance with the unevenness on the ground. But,
As in the conventional example, when the reel mower at the left and right positions is supported by the swing arm that swings around the axis in the front-rear direction, the reel mower is displaced in the horizontal direction when the reel mower is displaced in the vertical direction. The area is also displaced in the lateral direction.

In a lawn mower equipped with a plurality of reel mowers, the mowing areas in the lateral width direction of the respective reel mowers are overlapped with each other so as to prevent uncut mowing. However, as described above, when the cutting area in the lateral direction of the reel mower is displaced in the left-right direction at the time of vertical displacement, the overlapping amount of the cutting area should be sufficiently large so that even if the cutting area fluctuates at the time of work, uncut leaves will not occur. At present, it is necessary to increase the setting, and the cutting efficiency in each reel mower is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lawn mower which does not generate uncut even if the reel mower is displaced in the vertical direction without setting the overlapping amount of the cutting area in the width direction of the plurality of reel mowers to a large value. It is in the point that it comprises.

[0006]

According to a first feature of the present invention, as described at the outset, a reel mower provided at a center position in the left-right direction of a front portion of a traveling body, and a left-right position thereof. In the riding lawn mower, the reel mower provided in the above is arranged so that a part of each cutting width is overlapped, and each reel mower is supported on the traveling machine so as to be able to move up and down via a drive elevating mechanism. The drive elevating mechanism raises and lowers each reel mower without displacing the traveling direction of the traveling body in the front-rear direction and does not move laterally, and is configured to be freely set to a floating state that allows the reel mower to freely move up and down while the reel mower is in contact with the ground. The operation and effect are as follows.

A second feature (claim 2) of the present invention is that in claim 1, each of the drive elevating mechanisms is provided with an arm that is swingably supported around an axis centered in a lateral posture with respect to the traveling body. And an actuator for raising and lowering the arm. The operation and effect of the actuator are as follows.

A third feature of the present invention (claim 3) resides in that, in claim 2, the respective arms are configured to be swingable about axes having the same lateral orientation. And the effect is as follows.

A fourth feature (claim 4) of the present invention is that, in claim 2 or 3, an actuator constituting the drive elevating mechanism is configured to be a hydraulic type, and an oil passage for the hydraulic type actuator is closed. A valve that prevents the lowering of the reel mower that has been raised by the rotary actuator, and a rotary actuator that rotationally drives the reel blade of each of the reel mowers. There is a regulating mechanism for preventing the operation, and the operation and effect are as follows.

According to the first feature, by setting the drive elevating mechanism in the floating state at the time of work, the respective reel mowers are displaced in the horizontal direction when ascending and descending following irregularities on the ground. Therefore, there is no need to set a large overlapping amount of the cutting area in the width direction of each reel motor.

According to the second feature, the reel mower is not displaced in the horizontal direction when ascending and descending, while having a simple structure of the swingable arm and the actuator.

According to the third feature, since a plurality of arms are swingably supported around the same axis, the support structure can be simplified.

According to the fourth feature, any one of the reel mowers is maintained in a state where any one of the reel mowers is lifted as in the case where only the side reel mower is lifted out of the plurality of reel mowers for work. When the mowing work is performed, the hydraulic actuator is used to raise all (or a part of) the reel mower, close the oil passage with a valve corresponding to the target reel mower, and then control to lower the reel mower. The target reel mower is prevented from descending and is maintained in a lifted state, and the operation of the rotary actuator of the target reel mower is prevented by the regulating mechanism, so that the reel mower is not driven uselessly. In particular, in the reel mower, since the fixed blade is disposed in contact with the driven and rotated reel blade, by stopping the drive of the unused reel mower, heat generation due to friction between the reel blade and the fixed blade is eliminated. No damage to reel mower.

[Effect of the Invention] Therefore, even if the reel mower is displaced in the vertical direction, the mowing area is not changed, and the overlapping amount of the mowing areas in the lateral width direction of the plurality of reel mowers is set to a minimum value to achieve high efficiency. The riding-type lawn mower that enables the work was rationally configured (claim 1). Further, the support structure of the reel mower is simple and easy to manufacture (claim 2), the support structure of the plurality of reel moers is simplified and easy to manufacture (claim 3), and some reel moers are not used. Even when the work is performed, it is not necessary to use a configuration in which all the reel mowers are moved up and down independently, and there is no damage to the unused reel mowers.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, an engine 4 is disposed in a rear portion of a traveling body including a driving type front wheel 1 and a driving type rear wheel 2 to be steered, in a state of being installed in an engine hood 3. At the same time, the grass container 5 is arranged above the engine bonnet 3 and three reel mowers 6, 6,
6 is provided so as to be able to move up and down freely, and a riding lawn mower is constructed in which the cut grass from the respective reel mowers 6, 6, 6 is fed into the grass collection container 5 through the duct 7 and the suction blower 8, respectively.

[0016] Also, a forward and forward position of the traveling body is provided;
A step 11 for opening to both sides is formed, a control tower 12 is provided at a front position of the step 11, a steering handle 13 is provided at an upper end position of the control tower 12, and a driver seat 14 is provided at a rear position of the step 11. Further, a loop-shaped protection frame 15 for protecting the upper portion and side portions of the driver's seat 14 is provided. As shown in FIG. 5, the three reel mowers 6, 6, and 6 are arranged at a center position in the left-right direction with respect to the traveling machine body and at both side positions behind the center position. The two ends of the cutting width of the reel mower 6 and the inner ends of the cutting widths of the reel mowers 6 and 6 on both sides are arranged in a positional relationship so as to overlap with each other.

Also, the duct 7 is provided with three flexible first feeders for feeding cut grass from three reel mowers 6, 6, and 6, respectively.
Ducts 7a, 7a, 7a and these three first ducts 7
a, a, 7a, and 7a are joined at a position in front of the fuselage; and a second duct 7c, which is larger in diameter and flexible than the first duct 7a, for feeding the cut grass from the joining member 7b. The second duct 7c is arranged from the front of the body to the right side of the body, and the suction blower 8 is interposed at an intermediate position of the second duct 7c at the side of the traveling body. In addition, the second duct 7
c through the second duct 7
It is sent to the receiving cylinder 16 of the grass collection container 5 through an opening formed in the upper end of the container c in an oblique posture.
Also, the merging member 7b is formed by forming a tubular portion to which the first duct 7a is connected in such a manner as to open forward and left and right, and forming a tubular portion to which the second duct 7c is connected in such a manner as to open upward. The joining member 7b is supported in a fixed position via a column 17 at a position forward of a center position of the traveling body in the left-right direction.

As shown in FIG. 1, a joining member 7b is provided at a portion of the second duct 7c in front of the suction blower 8.
The position directly above the part connected to the suction blower 8 is set to the highest position, and the part connected to the suction blower 8 is set to be the lowest, so that it is arranged in an oblique posture, so that the cut grass does not remain in the second duct 7c. Has become.

As shown in FIG. 1, the grass collection container 5 is attached to the container main body 5a having an opening which is opened rearward in the posture shown in FIG. And a lid 5b. The grass collection container 5 is provided with a bracket 20 provided at a position below the opening edge.
Is connected to a stay 22 formed on a support frame 21 at the rear part of the traveling body so as to be swingable around a support shaft 23 in a lateral posture, so that the grass container 5 as a whole is in the grass-collecting posture shown in FIG. And the discharge posture shown in FIG. The cut turf sent in with the flow of air from the receiving cylinder 16 falls into the grass collection container 5 by its own weight due to a decrease in the flow velocity of the air inside the grass collection container 5 and is collected. The air is exhausted from an upper space inside the grass collecting container 5 to the rear side of the lid 5b (not shown).
Is discharged out of the container via the

The release cylinder 24 for switching the attitude of the grass container 5a is connected to the bracket 20 and the support frame 2.
1 and a link member 25 for opening and closing the lid 5b in conjunction with the switching of the attitude of the grass collecting container main body 5a is provided over the stay 22 and the arm 26 connected to the lid 5b. When the grass collecting container main body 5a is set in the grass collecting posture by driving the discharge cylinder 24 to the contraction side, the lid 5b is maintained in the closed state as shown in FIG. Grass container body 5 by driving
a is changed to the second position as shown in FIG.
The receiving cylinder 16 is separated from the upper end of the duct 7c, and
With the lid 5b opened, the cut grass can be discharged with the opening of the grass collecting container main body 5a facing downward.

As shown in FIG. 5, the suction blower 8 has a drive shaft 8a in a front-rear position.
Power from the engine 4 is transmitted to the motor a through a belt tension type clutch 28, a transmission shaft 29 in a front-rear position, and a belt transmission mechanism 30 formed between the transmission shaft 29 and the drive shaft 8a. It has become something.

As shown in FIG. 5, the base end of the first arm 33 extending in the front-rear direction of the traveling body with respect to the center position of the front end of the vehicle body frame 32 in the left-right direction, the axis X of the lateral posture. The base end of the second arm 34, which is pivotally supported around the periphery of the vehicle body frame 32 and is bent toward the outside of the traveling body toward the front end with respect to the left and right end positions of the front end of the body frame 32, has the shaft center in the lateral posture. It is pivotally supported around the coaxial core with X,
The respective reel mowers 6, 6, 6 are connected and supported at the front end positions of the first arm 33 and the second arm 34.

That is, as shown in FIG.
A lift arm 36 driven up and down by a first lift cylinder 35 is provided in the vicinity of the base end of No. 3 and the lift arm 36 and the base end of the first arm 33 are connected in a suspended state via a link member 37. Also, as shown in FIG. 7, each of the second arms
4. An arm 34a that swings integrally is provided.
Is provided with a second lift cylinder 38 for operating the. FIG.
As shown in FIG. 7, a channel-shaped support bracket 39 that opens forward is provided at the distal end position of each of the first arm 33 and the second arm 34 so as to be rotatable around a rolling axis Y in a front-rear posture. A center position of the main frame 40 above the reel mower 6 in the left-right direction with respect to 39 is rotatably supported around a yawing axis Z in a vertical orientation.

As shown in FIGS. 3 and 4, at the front end position of the traveling body, there is provided a frame member 41 having a shape which is directed upward toward the outer end in the left-right direction. Contact rollers 42, 42 made of an elastic material such as rubber are rotatably supported around an axis in a front-rear direction. When raising the three reel mowers 6, 6, and 6, the first lift cylinder 35, the second lift cylinder 38,
At the time of ascending, as shown in FIG. 4, contact rollers 42, 42 are attached to the main frames 40 of the reel mowers 6, 6 at the left and right positions.
, And the respective reel mowers 6, 6, 6 are rotated around the rolling axes Y, Y to switch to an inclined posture in which the outer end thereof is directed upward.

The three reel mowers 6, 6, and 6 have the same structure, and the structure will be described by taking the reel mower 6 at the center position as an example. That is, as shown in FIGS. 8 to 10, the reel mower 6 has a case body 45 including side wall members 45a, 45a arranged on the left and right, an upper wall member 45b arranged on the upper part, and a rear wall member 45c arranged on the rear part. And a guide member 46 detachably attached to a front position of the case body 45, and a reel blade rotatable around an axis in a laterally oriented posture with respect to the side wall members 45a, 45a. 47, a fixed blade 48 is disposed close to the outer periphery of the lower side of the reel blade 47, and a front ground roller 49 and a rear ground roller 50 as gauge wheels are provided for the front position and the rear position. One of the side wall members 45a is provided with a hydraulic motor 51 for driving the reel blade 47. Also, the upper ends of the support members 52, 52 extending upward so as to be able to swing relative to the side wall members 45a, 45a around the rod 54 penetrating the front portions of the left and right side wall members 45a, 45a to the left and right. Since the main frame 40 is provided in a form in which the reel frame 47 is connected in a posture parallel to the rotation axis of the reel blade 47, pitching around the rod 54 of the reel mower 6 is allowed at the time of work, and the followability to the ground is improved. Further, stoppers 43 are provided at the upper positions of the left and right side wall members 45a, 45a to determine the pitching limit of the reel mower 6 when the reel mower 6 is brought up to a level separated from the ground and comes into contact with the support member 52. ing.

The rear wall member 45c is provided so as to swing open and close around a swing shaft 53 in a horizontal posture. The guide member 46 has a rear portion communicating with the inside of the case main body 45 and is formed into a bag shape having a discharge port 46a opened upward at a front position, and the first duct is connected to the discharge port 46a. 7a is to be connected. Further, the discharge port 46a is set at the center position in the left and right direction in plan view, and a mountain-shaped guide slope is formed so as to project forward toward the center in the left and right direction in plan view so as to guide the cut grass to the discharge port 46a. Surface 46b,
46b are formed. A rod 54 in a horizontal position is disposed below the front opening inside the case body 45, and a left and right spring made of a spring material is elastically sandwiched between the lower end of the opening edge behind the guide member 46. The guide member 46 is provided with a pair of left and right buckles 57, 57 which can be disengaged from the pair of engagement pieces 56, 56 of the upper wall member 45a. 46 is configured to be detachable from the case body 45.

As shown in FIG. 9, the left and right side wall members 4
The air inflow path 44 is formed by setting a gap with a sufficient space for intake between the front positions of 5a and 45a and the ground.

The rotation direction of the reel blade 47 is set in the direction indicated by the arrow in FIG. 9, that is, the rotation direction is set so that the outer peripheral ground moves toward the rear side of the traveling machine body.
The cutting grass cut by the fixed blade 7 and the fixed blade 48 is
7 or is sent upward from the case lower position through the case rear position by the wind pressure caused by the rotation. The guide member 46 is fed forward inside the guide member 46 and guided by the inclined surface 46b of the guide member 46 to the center position in the left-right direction.
From above. Then, after being sent out in this manner, it is sent to the grass collection container 5 via the first duct 7a, the merging member 7b, the second duct 7c, the suction blower 8, and the receiving cylinder 16 to be collected. I have.

As shown in FIG. 10, the drive shaft 47a of the reel blade 47 has one end supported by a side wall member 45a via a bearing member 58, and the other end supported by the hydraulic motor 5a.
1 and supported on the side wall member 45a through the bearing member 5
8, each of the hydraulic motors 51 is a support shaft 5 disposed on a shaft center parallel to the drive shaft 47a at a position rearward of the drive shaft 47a.
As shown in FIG. 8, for example, on the side provided with the hydraulic motor 51, which is swingably supported around 9, 59, a screw shaft 61 screwed to a nut member 60 provided at each front position is provided. The knob 6 of the screw shaft 61 is provided on the side wall member 45a.
The rotating shaft 1a is configured to adjust the position of the drive shaft 47a in the vertical direction to adjust the gap with the fixed blade 48.

As shown in FIGS. 8, 11 (a) and 12 (a), the front ground roller 49 has a support shaft 49 extending over the entire width.
a, and metal roller portions 49 at both end positions
b on a support shaft 49a, and a grass upright portion in which large-diameter portions 49c and small-diameter portions 49d are alternately arranged in the middle portion is supported on the support shaft 49a.
The rear grounding roller 50 is configured to rotate freely on the support shaft 5.
It is configured with rollers of equal diameter over the entire width that is idlely supported around 0a. Also, the left and right side wall members 45
A front end portion of each of the a and 45a is bent laterally outward to form a vertical wall-shaped flange 64 as a support portion. A support member 65 is connected and fixed to the front surfaces of the left and right flanges 64 with bolts 66. is there. The support member 65 is vertically threaded with a screw shaft 67 threaded therethrough.
7a, a support piece 68 is provided at the lower end, and the support shaft 4 of the front ground roller 49 is attached to the left and right support pieces 68, 68.
9a is supported. The support member 65 is shown in FIG.
(B), as shown in FIG. 12 (b), it is also possible to connect to the rear side of the flange 64.

That is, the bolt 66 is attached to the flange 64.
When a support member 65 is connected to the front support surface of the flange 64, the grass cutting position by the reel blade 47 and the front ground roller 4 are formed.
9, the distance D from the contact point 9 is enlarged, and FIG.
12B, when the support member 65 is connected to the support surface on the rear side of the flange 64 as shown in FIG. 12B, the distance between the lawn cutting position by the reel blade 47 and the grounding point of the front grounding roller 49. When the distance d is reduced and the distance D is set to be enlarged, the turf that has fallen down by the pressure of the front contact roller 49 can be harvested in a state where it takes a long time to restore the turf to a standing posture, and the reduced distance can be obtained. When it is set to d, it can follow small irregularities on the ground with high accuracy.
The amount of downward protrusion of the front ground roller 49 is changed by rotating the knob 67a, so that the lawn mowing height can be adjusted.

As shown in FIGS. 8 and 9, a plate 69 having a plurality of through holes 69a formed in the vertical direction with respect to the outer surface at the rear end position of the left and right side wall members 45a, 45a is selected. The right and left plates 69, 69a are connected to the side wall member 45a through bolts 70 that pass through them.
A support shaft 50 a of the rear ground roller 50 is supported by 69. The plate 69 can be adjusted by selecting the through hole 69a through which the bolt 70 is inserted.
The amount of downward protrusion of the turf has been changed, so that the height of grass cutting can be adjusted.

As shown in FIG. 13, three hydraulic motors 5
1, 51, 51, first and second lift cylinders 35, 3
6 and 36, a hydraulic circuit is formed. In this hydraulic circuit, hydraulic oil from a hydraulic pump 71 driven by the engine 4 is arranged in series via a first oil passage L1 and a first solenoid valve V1. A path is formed to be sent to the three hydraulic motors 51, 51, 51, and a second oil to which hydraulic oil branched from the first oil passage L1 and return oil from the first solenoid valve V1 are sent.
The first and second lift cylinders 35, 36, 36 are provided in the oil passage L2.
And a second solenoid valve V2 for controlling the second solenoid valve V2.
A drain oil passage L3 for discharging the return oil from the tank is formed. In this hydraulic circuit, on-off valves V3, V4, V4 for switching between stop and drive of the three reel mowers 6 at the center position in the left and right direction and the hydraulic motors 51, 51, 51 of the left and right reel mowers 6, 6 are provided. And the first oil passage L1 and the second oil passage L1
A first variable throttle valve 72 for adjusting the drive speed of the hydraulic motors 51, 51, 51 is provided between the first oil passage L1 and the drain oil passage L3. A first relief valve 73 for ensuring the driving pressure of the first and second lift cylinders 35, 36, 36 between the second oil passage L2 and the drain oil passage L3. A variable throttle valve 74, a second relief valve 75 for securing the driving pressure of the first and second lift cylinders 35, 36, 36 between the second oil passage L2 and the drain oil passage L3; From the second solenoid valve V2 to the first and second lift cylinders 35, 36, 3
6 to the oil passage branched from the oil passage that sends hydraulic oil
A check valve 76 is opened by the pilot pressure when the second lift cylinders 35, 36, 36 are lowered. The first and second lift cylinders are provided on the drain oil passage side of the check valve 76 to reduce the ground pressure of the reel mower 6. 35, 36,
A third relief valve 77 for applying a back pressure to 36 is provided.

The first solenoid valve V1 is configured to be freely switchable to three positions so that the hydraulic motor 51 can perform normal rotation, reverse rotation, and stop, and the second solenoid valve V2 controls the rise, fall, and stop of the elevation of the reel mower 6. It is configured to be operable in three positions so that it can be performed,
During operation, the hydraulic oil is supplied to each hydraulic motor 51 by setting the first solenoid valve V1 to the normal rotation position, and the second solenoid valve V1
By setting 2 to the lowered position, the reel mower 6 is lowered until the front and rear ground rollers 49 and 50 are grounded. In this state, the back pressure from the third relief valve 77 acts, so that when there is unevenness on the ground, Is to float lightly following irregularities.

The left and right second lift cylinders 36, 36
And descent prevention valves V5 and V5 for preventing the hydraulic motors from being discharged from the cylinders to the oil passages to prevent the left and right reel mowers 6 and 6 from descending. Is linked with the on-off valve V4 via a regulating mechanism 78 composed of a wire or the like so as to stop driving the hydraulic motor 51 corresponding to the reel mower 6 when the closing operation is performed. Then, when performing the work while maintaining only one of the left and right reel mowers 6 and 6 in the up posture during the work, the first and second lift cylinders 35, 36 and 36 are operated by operating the second solenoid valve V2. After the hydraulic oil is supplied to raise the three reel mowers 6, 6, and 6, the descent prevention valve V5 corresponding to the reel mower 6 that is maintained in the raised state is closed, so that the oil passage is closed. As a result of the corresponding on-off valve V4 being in communication, even if the second solenoid valve V2 is operated to lower the first and second lift cylinders 35, 36, 36, the reel mower 6 is prevented from lowering, and The drive of the hydraulic motor 51 of the reel mower 6 is also stopped.

As described above, according to the present invention, the drive elevating mechanism comprises the first lift cylinder 35, the second lift cylinder 38 (an example of an actuator), the first arm 33, and the second arm 34.
When the three reel mowers are raised, the first lift cylinder 35 and the second lift cylinder 38 are simultaneously operated by operating the second solenoid valve V2 to the raised position, whereby the first arm 33, Since each of the second arms 34 operates upward around the axis in the horizontal posture, none of the reel mowers 6, 6, 6 is displaced in the horizontal direction. For this reason, in the riding lawn mower of the present invention, the overlapping amount of the cutting area of the left and right reel mowers 6 is made smaller with respect to both end areas of the cutting area of the reel mower 6 at the center position in the left and right direction, and the entire cutting is performed. The width can be expanded.

Further, according to the present invention, it is possible to carry out the work while maintaining either the left or right reel mower 6 in the lifted state. By operating the valve V2 to the raised position, all three reel mowers 6, 6, 6 are raised, and the lowering prevention valve V5 corresponding to the reel mower 6 for maintaining the lifted state is closed, and then the second electromagnetic valve V2 is moved to the lowered position. The other two reel mowers 6 are lowered by the operation described above. In this state, when the operating oil is supplied to the hydraulic motor 51 as a rotary actuator by operating the first solenoid valve V1, the lowering prevention valve V5 is closed. As a result of the opening / closing valve V4 of the hydraulic motor 51 of the corresponding reel mower being operated to the communication position by the regulating mechanism 78 in conjunction with the operation, the reel mower in the raised state is not driven. There. In particular, in reel mower 6,
Since the fixed blade 48 is disposed in contact with the driven and rotated reel blade 47, the drive of the unused reel mower 6 is stopped to prevent heat generation due to friction between the reel blade 47 and the fixed blade 48. The reel mower 6 is not damaged.

[Another Embodiment] In addition to the above-described embodiment, the present invention provides a descent-preventing valve so that, of the three reel mowers 6, 6, 6, for example, the reel mower 6 at the center position in the left-right direction can be maintained in a raised state. By providing the V5, the reel mower 6 at the center position is lifted, and a mowing operation is performed in a state where the left and right reel mowers 6 and 6 are grounded.
It is also possible to configure so that zebra cutting can be performed.

Further, according to the present invention, it is possible to use a pantograph-type link mechanism or a vertically long guide rail for the drive elevating mechanism so that the reel mower is moved up and down in a parallel attitude with respect to the traveling body. It is also possible to apply to a riding lawn mower having four or more reel mowers.

[Brief description of the drawings]

FIG. 1 is an overall side view of a lawn mower.

FIG. 2 is a side view of a grass collection container in a discharging position.

FIG. 3 is a front view of the lawn mower.

FIG. 4 is a front view of a state where a reel mower is raised.

FIG. 5 is a schematic plan view of a lawn mower.

FIG. 6 is a side view of a lifting / lowering structure of a first arm.

FIG. 7 is a side view of the lifting structure of the second arm.

FIG. 8 is a side view of a reel mower.

FIG. 9 is a longitudinal sectional side view of a reel mower.

FIG. 10 is a plan view of a reel mower.

FIG. 11 is a side view showing two states in which the mounting position of the front ground roller is switched.

FIG. 12 is a plan view showing two states in which the mounting position of the front ground roller is switched.

FIG. 13 is a hydraulic circuit diagram for a reel mower.

[Explanation of symbols]

 6 Reel mower 33, 34 Arm 35, 38 Actuator 51 Rotary actuator 78 Regulatory mechanism V5 valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Matsuo Tachibana 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Plant (72) Inventor Osamu Fujiwara 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house (72) Inventor Yoshihiro Kawahara 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Inside Kubota Sakai Plant, Inc. (72) Inventor Yoshiyuki Ezaki 64 Ishizu-Kitamachi Town, Sakai City, Osaka Prefecture In Kubota Sakai Plant, Inc.

Claims (4)

[Claims] 1. A reel mower provided at a center position in the left-right direction of a front portion of a traveling machine body and a reel mower provided at the left-right position are arranged so that respective cutting widths partially overlap each other. On the other hand, a riding lawn mower that supports each reel mower so as to be able to move up and down via a driving elevating mechanism, wherein the driving elevating mechanism displaces each reel mower in a lateral direction as viewed in the front-rear direction of the traveling machine body. A riding lawn mower configured to be freely settable in a floating state in which the reel mower can be freely moved up and down while the reel mower is in contact with the ground. 2. The apparatus according to claim 1, wherein each of the drive elevating mechanisms comprises an arm swingably supported around an axis centered in a lateral position with respect to the traveling body, and an actuator for operating the arm up and down. 1. The riding lawn mower according to 1. 3. The riding lawn mower according to claim 2, wherein each of said arms is configured to be swingable about an axis having the same lateral orientation. 4. An actuator constituting said drive lifting mechanism is configured to be hydraulic, and comprises a valve for preventing a lowering of a reel mower raised by closing an oil passage for the hydraulic actuator; 4. A passenger according to claim 2, further comprising a rotary actuator for rotating said reel blade, and a regulating mechanism for preventing operation of said rotary actuator when a lowering of the reel mower raised by closing of the valve is prevented. Type mower.