JP2000324923A - Mowing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mowing machine capable of certainly preventing running off of a belt for transmitting a power to a rotative blade even when a mowing unit is raised to an escaped position higher than a usual mowing position and good in reliability and durability as to a mowing machine for mowing lawn and grass. SOLUTION: In a mowing machine installed with a mowing unit 4 capable of being lifted from a usual mowing position to a higher escaped position under a traveling machine body, a lift lever 24 for lifting the mowing unit 4, a belt transmission mechanism for transmitting a power to a rotative mowing blade 5 installed to the mowing unit 4, a clutch for intermittently transmitting the power to the rotative mowing blade 5 and a clutch operation lever 14, a regulatory material 30 for preventing connection of the clutch in a lifted state of the mowing unit 4 lifted to the escaped position is specifically installed between the lifting lever 24 and the clutch operating lever 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower for cutting lawn and grass. More specifically, the present invention relates to a mower in which a mowing portion having a rotary mowing blade is configured to be able to move up and down between a normal mowing position and a retracted position higher than the normal mowing position, and to transmit power to the rotary mowing blade by belt transmission. .

[0002]

2. Description of the Related Art Conventionally, for example, in a riding type mowing machine, a mowing portion is provided between the front and rear wheels at a lower portion of a traveling machine body, and a rotary cutting blade provided in the mowing portion is provided with a power from an engine mounted on the machine body. Is generally transmitted by a belt. That is, a drive pulley that rotates by the power of the engine is provided on the machine body side, and a driven pulley for the drive pulley is provided on the reaping unit side, and a belt is suspended around the two pulleys.

[0003] The above-mentioned mowing section is generally constructed so as to be adjustable in height, so as to adjust the mowing height. When transporting such a mower on a truck bed or the like, an inclined plate is installed at the rear of the bed, and the mowing unit is placed on the bed while moving on the inclined plate. The reaper is configured to be able to be held in a retracted position above a normal reaping height so as not to come into contact with the upper end of the inclined plate or the loading platform.

[0004] By the way, when a normal mowing operation is performed, the height of the driving pulley and the driven pulley is almost equal or slightly shifted, so that the belt hardly comes off during transmission. If the mowing unit is raised to the retracted position during transportation of the mower, the heights of the driving pulley and the driven pulley are largely displaced, and if the belt is driven in this state, the belt may come off the pulley. There is. So, when I raised the mowing part,
There has been proposed a system in which the power intermittent clutch to the reaper is disengaged in conjunction therewith.

[0005]

However, as described above, the clutch that is disengaged in conjunction with the raising operation of the mowing part is often changed over time due to wear or deformation of the interlocking mechanism due to long-term use. The interlocking operation may be uncertain. In addition, the raising and lowering operation of the reaping unit and the intermittent operation of the clutch are adversely affected, and there are disadvantages such as reduction in reliability and durability.

The present invention has been proposed in view of the above problems, and has as its object to provide a reliable and durable mower.

[0007]

Means for Solving the Problems To achieve the above object, a mower according to the present invention has the following configuration.

[0008] That is, a mowing portion which can be moved up and down between a normal mowing position and a retracted position above the normal mowing position,
Mowing machine comprising an elevating lever for raising and lowering the cutting unit, a belt transmission mechanism for transmitting power to a rotary cutting blade provided in the cutting unit, a clutch for intermittently supplying power to the rotary cutting blade, and a clutch operating lever. The machine is characterized in that a regulating member for preventing the clutch from being connected with the reaper raised to the retracted position is provided between the lifting lever and the clutch operating lever.

According to the above configuration, it is possible to reliably prevent the clutch from being connected in a state where the mowing portion is raised to the retracted position, and to perform the raising / lowering operation of the mowing portion by the raising / lowering lever and the clutch by the clutch operating lever. Can be performed independently and reliably.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a mower according to the present invention will be specifically described based on an embodiment shown in the drawings. FIG. 1 is a side view of a schematic configuration showing an embodiment of a mower according to the present invention,
FIG. 2 is an enlarged view of a part thereof.

The embodiment shown in FIG. 1 is applied to a riding-type mower, and a front body 2 and a rear wheel 3 are provided at a front lower portion and a rear lower portion of a body frame 1 of a traveling body, respectively. The vehicle is configured to run at a predetermined speed by rotating and driving the rear wheel 3 with power from an engine (not shown) mounted on the upper portion.

A mowing portion 4 is provided below the body frame 1 between the front and rear wheels 2 and 3, and the mowing portion 4 includes a rotary blade 5 and a blade housing that covers the upper surface of the rotary blade 5. Consists of 6 mag. The cutting blade housing 6 is connected to and held by the machine body frame 1 by a parallel link 7 so as to be vertically movable. The rotary cutting blade 5 is provided at the lower end of a longitudinal axis 9 which is rotatably provided on the cutting blade housing 6 via a bearing member 8. However, the driven pulleys 10 are provided integrally with the upper end of the longitudinal axis 8, respectively.

On the other hand, a drive pulley 12 is provided on the body frame 1 on an output shaft 11 for driving the cutting blade, which is output from an engine (not shown) via a speed reducer (not shown). A belt 13 is suspended around the pulley 12 and the driven pulley 10. In the vicinity of the belt 13,
Although not shown in the figure, a tension pulley is provided as a power intermittent clutch to the rotary cutting blade 5, and transmission of power from the driving pulley 12 to the driven pulley 10 by moving the tension pulley toward and away from the belt 13. A clutch operation lever 14 that allows or shuts off is provided on one side of the body frame 1. The clutch operation lever 14 is provided with a lever bracket 14 provided integrally therewith.
The support arm 15 is attached to the support arm 15 provided in the side cover 17 on the body frame 1 via the support shaft 16 via a.

FIG. 3 is a plan view of an operation panel 20 provided on the front inclined surface of the side cover 17. The operation panel 20 has a sliding guide hole 21 for the clutch operation lever 14, a lifting guide A lever slide guide hole 22 is provided. The clutch operating lever 14 can be tilted within the range of the sliding guide hole 21, and the clutch operating lever 14 is tilted to the solid line position (ON position) in FIGS. When the tension pulley (not shown) is engaged with the concave groove 21a on the
And the transmission from the driving pulley 12 to the driven pulley 10 is allowed.

Further, the clutch operating lever 14 is
When the lever 14 is moved to the end 21b of the slide guide hole 21 on the opposite side to the concave groove 21a and is raised to the position shown by the chain line (OFF position) in FIGS. (Not shown) is configured to be separated from the belt 13 so that the transmission from the driving pulley 12 to the driven pulley 10 is cut off. Note that the clutch operation lever 14 is
When the transmission from the driving pulley 12 to the driven pulley 10 is interrupted by being raised at the chain line position (OFF position) in FIG. 2, a braking means (brake) for stopping the rotary cutting blade 5 in conjunction therewith is provided. But omitted from the figure.

Further, an elevating lever 24 for raising and lowering the reaper 4 is provided near the clutch operating lever 14. The lifting lever 24 is connected to the body frame 1 via a lever bracket 24a provided integrally therewith.
The lever bracket 24a is attached to the upper support bracket 25 so as to be tiltable by a support shaft 26, and the parallel link 7 and the lever bracket 24a are connected by a lifting link 27. 28 is a connecting pin between the lifting link 27 and the parallel link 7, 29a is a connecting pin between the lifting link 27 and the lever bracket 24a,
Reference numeral 29b denotes a slot for inserting the connecting pin 29a.

The raising / lowering lever 24 is tilted about the support shaft 26 so that the sliding guide hole 22 shown in FIG.
When a normal mowing operation is performed, the concave grooves 22U, 22M, 22
By selectively engaging with the 22L, the cutting unit 4 can be changed to three levels of upper (U), middle (M), and lower (L), thereby cutting the grass by the rotary cutting blade 5. Height can be adjusted. When the mower is carried, for example, the mowing portion 4 is engaged with the concave / groove lever 22 in the concave groove 22H on the right side of the concave groove 22U in FIG. 3 as shown in FIG. Can be raised to the retracted position (H) further above the cutting position.

The lifting lever 24 is connected to the above-mentioned concave groove 22.
U, 22M, and 22L, when performing normal mowing work, the height of the drive pulley 12 and the driven pulley 10 is substantially equal or slightly shifted, and the drive pulley 12 And the driven pulley 10 are separated from each other, so that even if the clutch is engaged in this state (the tension pulley is pressed against the belt), the belt does not come off, but the lifting lever 24 is engaged with the concave groove 22H and the mowing is performed. When the section 4 is moved to the retreat position (H) above the normal mowing position as shown in FIG. 4, the height of the drive pulley 12 and the driven pulley 10 is largely shifted, and the clutch is disengaged in that state. If so, the belt 13 may come off from the driving pulley 12 or the driven pulley 10.

Therefore, in the present invention, the lifting lever 24
Is moved to the retracted position (H), and the restricting member 30 for preventing the clutch from being connected is moved up and down by the lifting lever 2.
4 and the clutch operation lever 14. The regulating member 30 in the illustrated example is provided integrally with a U-shaped sliding piece 32 at one end of a rotating arm 31 that is rotatably mounted on a lever bracket 14a of the clutch operation lever 14 with a horizontal axis 33, The sliding piece 32 is slidably engaged with and held by a sliding guide pin 34 provided on a lever bracket 24a of the elevating lever 24.

In the above construction, in performing a normal mowing operation, in a state where the lifting lever 24 is engaged with any of the concave grooves 22U, 22M, 22L of the sliding guide hole 22, the clutch operating lever is operated. Numeral 14 is arbitrarily rotatable between a chain line position (ON position) and a solid line position (OFF position) shown in FIGS. 1 and 2, whereby the clutch can be arbitrarily connected and disconnected. Also, the clutch operation lever 14
In the state where is raised as shown in FIG. 4, that is, when the clutch is disengaged (OFF state), the elevating lever 24 can be raised and lowered to an arbitrary position.

On the other hand, when the clutch operating lever 14 is tilted as shown in FIG. 2, that is, when the clutch is engaged (ON
State), the lifting lever 24 is connected to the groove 22U,
The mowing unit 4 can be moved up and down to any of the upper (U), middle (M), and lower (L) positions by engaging with any one of 22M and 22L. When pivoted in the retracted position (H), that is, in the direction engaging with the concave groove 22H, the sliding guide pin 34 provided on the lever bracket 24a of the elevating lever 24 as shown in FIG.
The abutment is in contact with the inner surface of the end of the zero U-shaped sliding piece 32, and further rotation is prevented. Therefore, when the clutch is engaged, the lifting lever 24 cannot be raised to the retracted position shown by the chain line in FIG. 6, thereby preventing the belt 13 from coming off.

Further, as shown in FIG. 5, the elevating lever 24 is rotated to the uppermost retracted position (H), and the clutch operating lever 14 is raised to the position indicated by the chain line 14A (OF).
From state F), when the clutch operation lever 14 is tilted forward to engage the clutch, the sliding guide pin 34 comes into contact with the inner surface of the end of the U-shaped sliding piece 32, and the clutch operation lever 14 The above rotation is prevented. This prevents the belt 13 from being driven in a state where the mowing unit 4 has moved to the upper evacuation position, and prevents the belt from coming off.

If a rotation preventing lever 35 for preventing the rotation of the clutch lever 14 when the lifting lever 24 is rotated to the retracted position (H) is provided as shown in FIG. It is possible to more reliably prevent the clutch from being engaged in a state where the clutch is raised to the upper evacuation position. In the case of the figure, the rotation preventing lever 35 is rotatably mounted on the lower surface side of the operation panel 20 by a support shaft 36, and the lever 35 is always provided with a tension coil spring 37 provided on one end 35a side thereof. As a result, it is biased to rotate clockwise in the figure, and is in the position of the solid line in the figure by a stopper omitted in the figure. In this state, the clutch operating lever 14 is moved to the end 21b of the sliding guide hole 21 as shown by the chain line in the figure, and the elevating lever 24 is engaged with the concave groove 22H. , And the other end 35b of the lever 35 advances into the slide guide hole 21 as shown by a chain line. Thus, the clutch operation lever 14 is prevented from rotating to the left in the drawing.

In the embodiment shown in the drawings, the regulating member 30 has the lever bracket 1 of the clutch operating lever 14.
4a, a U-shaped sliding piece 32 is integrally provided at one end of a rotating arm 31 rotatably mounted on a horizontal shaft 33, and the sliding piece 32 is provided on a lever bracket 24a of the elevating lever 24. Although the sliding guide pin 34 is slidably engaged with the moving guide pin 34, for example, the rotating arm 31 is slidably mounted on the lifting lever 24 side and engages with the sliding piece 32.
May be provided on the clutch operation lever 14 side. The shape and mounting structure of the restricting member 30 can be changed as appropriate. For example, the restricting member 30 may be a plate-like member having an elongated hole at at least one end, or may be a ring-shaped member having a substantially oval shape as a whole. is there.

[0025]

As described above, the mowing machine according to the present invention has a mowing portion 4 which can be moved up and down between a normal mowing position and a retracted position higher than the mowing portion, at the lower part of the traveling machine body.
Lever 24 for raising and lowering the blade, a belt transmission mechanism for transmitting power to the rotary cutting blade 5 provided on the cutting unit 4, a clutch for intermitting power to the rotary cutting blade 5, and the clutch operating lever 14. The mowing machine 4
Since the regulating member 30 for preventing the clutch from being connected in the state of being raised to the evacuation position is provided between the elevating lever 24 and the clutch operation lever 14, the mowing part 4 is raised to the evacuation position. In this state, the clutch can be reliably prevented from being connected, and the raising and lowering operation of the mowing unit 4 by the raising and lowering lever 24 and the on-off operation of the clutch by the clutch operating lever 14 can be performed independently and reliably. This makes it possible to provide a mower with good reliability and durability.

[Brief description of the drawings]

FIG. 1 is a side view of a schematic configuration showing an embodiment of a mower according to the present invention.

FIG. 2 is an enlarged side view of a part of the mower.

FIG. 3 is a plan view of an operation panel.

FIG. 4 is an enlarged side view of a part of the state where the mowing unit is pulled up to a retracted position.

FIG. 5 is an explanatory diagram of a state in which a clutch connection operation is performed in a state where the mowing unit is raised to a retracted position.

FIG. 6 is an explanatory view of a state in which the reaping unit is pulled up with the clutch connected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 2 Front wheel 3 Rear wheel 4 Cutting part 5 Rotating cutting blade 6 Cutting blade housing 7 Parallel link 10 Follower pulley 12 Drive pulley 14 Clutch operation lever 24 Lifting lever 30 Regulation member 31 Rotating arm 32 Sliding piece

Claims (1)

[Claims] 1. A cutting part which can be moved up and down between a normal cutting position and a retreat position above it, a raising and lowering lever which moves up and down the cutting part, and a rotary cutting provided on the cutting part. In a mowing machine including a belt transmission mechanism for transmitting power to a blade, a clutch for intermittently supplying power to the rotary cutting blade, and the clutch operation lever, the clutch may be lifted to a retracted position while the clutch is raised. A lawn mower characterized in that a regulating member for preventing connection is provided between the lifting lever and the clutch operating lever.