JPH08228552A - Braking of cutter in mower - Google Patents

Abstract

PURPOSE: To perform raising of a cutter, an operation letting out a clutch and an operation braking the cutter in single operation for protection from danger and breakage of the cutter in moving of a mower. CONSTITUTION: A reaping part 2 is freely elevatingly provided below a chassis between a front wheel W1 and a rear wheel W2 of a mower A. The reaping part 2 is raised and lowered by an elevator handle 34 and has a cover 20 and a cutter C. A vertical shaft 50 of the cutter C has a driven pulley 51 and is driven by a driving pulley of a prime mover E through a belt. An operation clutch mechanism intermittently transmitting a driving force to the belt is provided near the belt and has the elevator handle 34 and a clutch lever 41. The clutch lever 41 raises the reaping part 2 up to a prescribed position by acting on the elevator handle 34, and then, operates to a let out side following the elevation handle 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of braking a cutter of a mower, and more particularly, to braking of a cutter of a mower by raising a reaper to stop the disengagement of a clutch and the rotation of the cutter. Regarding the method.

[0002]

2. Description of the Related Art A riding-type mower is used for cutting grass and grass. In the conventional riding-type mower, the mowing part cannot be moved up or down, or even if it can be moved up and down, the lifting stroke is small. For this reason, when running on an inclined plate leaning against the bed of a truck and placing it on the truck, there is a problem that the reaping unit comes into contact with the upper end of the inclined plate and cannot be placed by one person. This problem can be solved by increasing the lifting stroke of the reaper.

[0003] The cutter of a riding type mower is driven by a driven pulley driven from a driving pulley via a belt. The drive pulley is provided on the side of the vehicle body, and the driven pulley is provided on the side of the mowing unit that moves up and down. Thus, when the cutting unit is lowered, that is, during the cutting operation, the driving pulley and the driven pulley are positioned on the same plane, are set at the same height, and are set to have high transmission efficiency.

For this reason, when the mowing section is raised, that is, when the mower is moved, there is a difference in height between the driving pulley and the driven pulley. If tension is applied to the belt at that time, the belt will come off the pulley.

By the way, when the cutting unit is raised, that is, when the mowing machine is moved, it is necessary to brake the rotation of the cutter in order to prevent danger and damage to the blade. In that case, it is not only convenient if the disengagement of the clutch and the braking of the cutter can be performed by the operation of raising the cutting unit, and the belt does not come off the pulley.

[0006]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to raise the cutting portion so that the clutch disengagement operation and the cutter rotation can be braked.

[0007]

[Means for Solving the Problems] Means for solving the above problems and achieving the object of the present invention are as follows. First
In the invention of claim 1, there is provided a mowing section which has a rotating cutter and is vertically movable below the vehicle body through an ascending / descending means, an elevating and lowering operation means for elevating and lowering the mowing section, and an intermittent driving force to the cutter. A method for braking a cutter of a mowing machine, comprising: a clutch mechanism for taking the clutch, wherein the disengaging operation of the clutch and the rotation of the cutter are braked by raising the mowing section. This is the method of braking the cutter.

[0008]

For example, when the mowing machine is loaded on a truck for transportation or when the mowing work area has a lot of unevenness, the mowing section arranged below the mowing machine is raised by the elevating operation means.
By raising the cutting unit, the clutch disengagement operation and the cutter rotation are braked. As a result, rotation of the cutter is stopped and safety can be ensured.

[0009]

The present invention will be described in more detail based on the riding type mower shown in the drawings. FIG. 1 is a schematic side view showing an embodiment of a mower for realizing the present invention, FIG. 2 is a rear view of a main part showing the structure of a drive part, and FIG. 3 is a main part showing the structure of a lifting lever and a clutch lever. FIG. 4 is a perspective view, and FIG. 4 is an explanatory view showing the structure of the drive unit. Reference numeral A is a mower, which has a frame 1. A front axle 10 and a rear axle 10a are provided at the front and rear of the frame 1. A front wheel W1 and a rear wheel W2 are attached to each axle 10, 10a.

At the rear of the frame 1, a rear axle 10a and a prime mover E for driving a cutter described later are mounted.
The cooling air duct D of the prime mover E is led out downward. Pulleys P1, P2 are provided on a drive shaft 13 (shown in FIG. 2) of the prime mover E.
Is installed. A belt B1 is wound around the pulley P2 and the pulley P3 of the mission M arranged on the rear side of the rear portion of the frame 1. Reference numeral 14 is a tension pulley forming a clutch. A belt B2 is wound between the pulley P1 and a driven pulley 51 which is a vertical axis of the cutter, which will be described later.

At the front portion of the frame 1, a steering wheel S for steering the front wheels W1 is provided. Further, reference numeral 12 is a brake pedal, 120 is an operating rod for operating the traveling brake and disengaging the traveling clutch together with the brake pedal, and B is a battery.

A seat frame plate 15, which is formed by swelling upward, is attached to the upper portion of the middle portion of the frame 1. The seat 11 is attached to the upper portion of the seat frame plate 15. Below the seat frame plate 15, a support plate 15a which is formed in substantially the same shape as the seat frame plate 15 and supports the vertical shaft 50 described later together with the top cover 201 is provided. The support plate 15a is attached to the upper portion of the cover 20 described later. Further, the seat frame plate 15 and the support plate 15a are formed by using the same mold, so that the cost is reduced.

A reaper 2 is disposed below the middle of the frame 1. The mowing unit 2 includes a cover 20 having a substantially disc shape. The cover 20 has a side cover 200 and a top cover 201. The support plate 15a described above is provided on the top cover 201. The front side of the side cover 200 is open, and the rear side and the left side in the traveling direction are closed by the side cover 200. On the right side of the cover 20, a side cover 24 that constitutes a part of the side cover 200 is provided. The side cover 24 is rotatable upward, and the right side of the cover 20 can be opened and closed.

The mowing section 2 including the cover 20 includes mounting pins 30a, 30b, 30c, 30d and links 31,3.
It is attached to the frame 1 so as to be able to move up and down by a link device 3 composed of 2, 33 (provided on the left and right of the frame 1). A long hole 330 is provided at the upper end of the link 33. The link 33 is attached by slidably fitting the elongated hole 330 into the pin 341 of the rotation support 340.
The base of the rotary support 340 is rotatably attached to the support plate 43 via a support shaft 342. Further, an elevating handle 34, which is an elevating and lowering operation body, is attached to the rotation support body 340 so as to be rotatable around the base portion as a central axis.

The elevating handle 34 is inserted into an adjusting groove 350 of an arcuate adjusting plate 35 adjacent to the support plate 43. The adjusting groove 350 is provided with hooking portions 351 that are cut out in a semicircular shape at four locations on the lower portion. A hook 352 is provided on the upper end of the adjustment groove 350.

According to the above structure, the cover 20 can be lifted by pulling the lifting handle 34 upward. Note that the mowing unit 2 is constantly pulled upward by the pull-up spring 25, which reduces the force required to pull up the elevating handle 34 by manual operation, and the link device 3
The burden on each part is reduced.

Above the support plate 43, a clutch lever 41 serving as means for operating a clutch mechanism via a support shaft 44 is provided.
The rear part is attached so as to be rotatable. An engagement pin 42 is provided near the support shaft 44 of the clutch lever 41 so as to project toward the adjustment plate 35. The tip of the engaging pin 42 is projected to a position where it contacts the rotating support 340 that rotates. An attachment pin 45 is provided at the rear end of the clutch lever 41 so as to project to the side opposite to the engagement pin 42. Attachment pin 4
One end of an operation wire W to be described later is attached to 5.

FIG. 3 shows a case where the operation wire W is pulled. Then, from this state, if the elevating handle 34 is pulled up and hooked on the hooking portion 352, the rotation support body 340 pushes up the engagement pin 42, turns the clutch lever 41 upward, and loosens the operation wire W. This actuates the clutch mechanism in the disengagement direction.

A vertical shaft 50 is attached to the center of the cover 20 via a bearing (not shown). Further, the vertical shaft 50 penetrates the support plate 15a through a bearing (not shown), and a driven pulley 51 is attached to the upper end thereof.
The driven pulley 51 is located in the space between the seat frame plate 15 and the support plate 15a. The belt B2 is wound around the driven pulley 51 as described above, and is driven by the prime mover E.

A cutter C is attached to the lower end of the vertical shaft 50. The cutter C has a cutter bar 21, and the cutter bar 21 is horizontally attached to a vertical shaft 50. The cutter bar 21 is located below the cover 20, and a cutting blade 22 is swingably (fixable) attached to both ends of the cutter bar 21 via shaft pins 23. The cutting edges of both cutting blades 22 are set so as to fit inside the cover 20.

The pulley P1 on the prime mover E side and the driven pulley 51
On the side of the pulley P1 of the belt B2 wound around the
A tension pulley 16 forming a clutch mechanism is arranged. The tension pulley 16 is attached to the front part of the arm 160, and the intermediate part of the arm 160 has a shaft pin 161.
It is rotatably supported by. The tip of the operation wire W is attached to the rear end of the arm 160. The intermediate portion of the operation wire W is passed through the tube T, and the proximal end portion is attached to the attachment pin 45 of the clutch lever 41.

Further, a rear end portion of the brake rod 170 is attached to a front portion of the arm 160 beyond the shaft pin 161 via a shaft pin 162. The tip of the brake rod 170 is formed in a hook shape, and is hooked on a part of a brake shoe 17, which is a braking means, which is rotatably attached via a support shaft 171. The brake shoe 17 rotates forward when the arm 160 rotates to release the tension on the belt B2 by the tension pulley 16, and the driven pulley 5
Apply the brake by pressing the 1st surface. Also arm 160
When the belt B2 is rotated and tension is applied to the belt B2 by the tension pulley 16, the belt B2 is rotated rearward to release the brake.

FIG. 5 is an explanatory view showing the operation of the cover and the cutter during the mowing work. The method of use and the operation of this embodiment will be described with reference to FIGS. (1) The operator gets on and operates the elevating handle 34 to adjust the height of the mowing unit 2 to an optimum height for the state of the mowing work site.

(2) Even when a convex portion of the work site comes into contact with the mowing portion 2 during the mowing work, only the mowing portion 2 bounces up due to the action of the elongated hole 330 of the link 33, releasing the force and damaging each part. To prevent.

Since the front of the cover 20 is open,
As shown in FIG. 5, even when mowing long grass, the grass does not fall down easily and is easy to mow. When the side cover 24 of the cover 20 is bent upward to open the side, the cutting blade 22 can be easily replaced. Further, since the cutting blade 22 of the cutter C is swingably attached, it is easy to escape even when hitting a hard object such as a road stone, and damage can be prevented.

(3) When the mowing machine is loaded on the transport truck, the mowing section 2 may come into contact with the pedestal or the like at the height at which the work is carried out, or when the work site has many irregularities. Part 2 is raised. At that time, the elevating handle 34 is pulled up and hooked on the hooking portion 352. As a result, the rotation support 3
40 pushes up the engagement pin 42, turns the clutch lever 41 upward, and loosens the operation wire W. When the operation wire W is loosened, the arm 160 is rotated, the tension on the belt B2 by the tension clutch 16 is released, and the belt B2 is released.
Is loosened and the operation of the cutter C is stopped even during operation. At this time, the brake shoe 17 rotates to stop the driven pulley 51.

Further, since the belt B2 is loosened, the belt B2 does not drop even if there is a difference in height between the driven pulley 51 and the drive pulley P1. The present invention is not limited to the illustrated embodiments, and various modifications can be made within the scope of the claims.

[0028]

The present invention having the above-mentioned structure has the following effects. For example, when the mowing machine is loaded on a truck for transportation, or when the mowing work area has a lot of unevenness, the mowing section arranged below the mowing machine is raised by the elevating operation means. By raising the cutting unit, the clutch disengagement operation and the cutter rotation are braked. As a result, rotation of the cutter is stopped and safety can be ensured.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of a mower for realizing the present invention.

FIG. 2 is a rear view of a main portion showing the structure of a drive unit.

FIG. 3 is a perspective view of essential parts showing structures of a lift lever and a clutch lever.

FIG. 4 is an explanatory diagram showing a structure of a drive unit.

FIG. 5 is an explanatory view showing the action of the cover and the cutter during the mowing work.

FIG. 6 is an explanatory view showing actions of a cover and a cutter during a conventional mowing operation.

[Explanation of symbols]

 A Mower 2 Mowing part 20 Cover 21 Cutter bar 22 Cutting blade 24 Side cover 25 Lifting spring C Cutter 34 Lifting handle 41 Clutch lever 50 Vertical shaft 51 Driven pulley B2 Belt

Claims (1)

[Claims] 1. A reaping unit having a rotating cutter and capable of moving up and down under a vehicle body through an elevating unit, an elevating and lowering operation unit for elevating and lowering the reaping unit, and a clutch for connecting and disconnecting a driving force to the cutter. And a mechanism for braking the cutter of a mower, wherein the cutting operation of the clutch and the rotation of the cutter are braked by raising the reaper. Braking method.