JPH0314976Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to walking-type paddy field working machines such as rice transplanters, sowing machines, and turning machines.

[Problems to be solved by the prior art and the invention]
Generally, in this type of paddy field working machine, the running wheels that run on the tiller move up and down with respect to the machine body to maintain a substantially constant working posture with respect to the field, thereby making the working depth uniform. I try to measure it. However, in this device, in order to counter the running reaction force from the field during planting, the running wheels are moved backward when the running wheels move downward within the vertical movement range of the running wheels during planting work. An example of this is shown in Japanese Patent Publication No. 52-23928. However, due to its mechanism, when running on the road, when the running wheels are lowered far beyond the range of vertical movement during planting work, the rearward displacement of the running wheels is small and the wheels are almost vertical. As a result, the operator holding the operating handle has to support the aircraft with a large hand load, which requires a great deal of effort and increases the workload. Moreover, there is a problem in that it is difficult to move the aircraft around.

[Means for solving problems]

The present invention was devised in view of the above-mentioned circumstances with the aim of providing a walking-type paddy field work machine that can eliminate these drawbacks.
In a walk-behind paddy field work machine that maintains the machine body in a substantially constant working posture with respect to the field surface by vertical displacement of the running wheels, the base end of the vertical movement mechanism of the running wheels swings toward the machine body. a first chain case which is pivotably supported; a second chain case whose proximal end is bendably provided on the distal end side of the first chain case and a running wheel is pivoted on the distal end side; A swinging arm is swingably supported on the fuselage side at a position rearward of the swinging support shaft of the second chain case, and a swinging arm whose distal end side extends forward and is pivotally connected to the second chain case, The running wheels are swung around the pivot on the machine side of the swinging arm, and are moved up and down in the vertical direction during the range of vertical movement when working in paddy fields, and further down beyond the range of vertical movement when working in paddy fields. The present invention is characterized in that the traveling wheels are configured to be displaced by a large amount of backward movement when the vehicle is in use.

The present invention utilizes a bendable chain case that bends at the middle of the structure to displace the running wheels significantly backwards when the wheels are moved down beyond the paddy field work range. This makes it possible to greatly reduce the burden on the worker's hands.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings. In the drawing, reference numeral 1 denotes a walk-behind rice transplanter, which is equipped with an engine 2 in the front, and a seedling stand 3 with a low front and high back.
The unit planting seedlings are scraped off from the seedling platform 3 and planted on the rice field by the planting operation of the planting claw 4 in synchronization with the movement of the machine, as is conventional.

5 is a running wheel, and the running wheel 5 is a chain case (corresponds to the second chain case of the present invention).
The front end of the second chain case 6 is rotatably (flexibly) supported on the front end of the first chain case 7.
The first chain case 7 is swingably supported at the lower part of the transmission case 8 with a support shaft 7a as a fulcrum, and the driving force from the engine is transmitted from the transmission case 8 to the first chain case 7. , the power is transmitted to the running wheels 5 via the second chain case 6, thereby running and rotating.

Reference numeral 9 denotes a swinging arm whose rear end is swingably supported on a fulcrum shaft 10 provided at a position rearward of the front swinging support shaft of the second chain case 7 on the body frame 1a side of the rice transplanter 1. The swinging arm 9 extends forward, and its front end is pivotally supported at the intermediate portion of the second chain case 6 via a pin shaft 6a. The middle part of this swinging arm 9 (in the embodiment, the plate hanging from the bay body) has a plurality of (two in total in the embodiment)
An engagement hole 11b is formed in the swinging arm 9.
The rear end of the connecting rod 11 is swingably supported via the pin shaft 11a so that one of the engaging holes 11b can be selected.
At the front end of the operating arm 12, the upper end of the operating arm 12, whose lower end is swingably supported on the body frame 1a by a support shaft 12a, is swingably supported via a pin shaft 12b. Moreover, the upper end of this operating arm 12 is further interlocked and connected to the cylinder rod of a hydraulic cylinder 13. Then, the hydraulic cylinder 13 is moved to the connecting rod 1 by the swinging of the operating arm 12 accompanying the expansion and contraction operation.
1 is pushed rearward and displaced, and as a result, the swinging arm 9 swings downward and rearward about the fulcrum shaft 10, and the second chain case 6 is moved so that the front end of the second chain case 6 is Support shaft 7 of first chain case 7
As shown in Fig. 2, with rocking around a as a fulcrum, the plant moves vertically up and down in a straight line within the range of vertical movement during planting work, and when it moves further down beyond this range, The traveling wheels 5 are set to be displaced by a larger amount of backward movement as they move downward.
In addition, in the figure, 14 is a float, and 15 is a driving handle.

In the embodiment configured as described above, when planting work is being performed, the hydraulic cylinder 13 expands and contracts by detecting the depth of the tiller (for example, detected by the ground pressure received by the float 14), and the operating arm 13 Due to the continuous bending motion of both chain cases 6 and 7 and the rocking motion of the rocking arm 9, the running wheel 5 moves linearly in the vertical direction as described above. The planting operation will be performed. Therefore, this product has unevenness on the tiller when traveling during planting,
Even if the traveling wheels 5 are vertically displaced, there is an advantage that the longitudinal balance of the machine body remains substantially constant without changing, which contributes to improved workability.

After completing the planting run for this one-stroke work, it is necessary to rotate the machine for the next work cycle.
In this case, the traveling wheels 5 are moved further down beyond the range of vertical movement required for the planting work, and the work is carried out after lifting the machine body together with the float 14 from the field surface. In other words, if the float 14 remains in contact with the ground while the aircraft is rotating, the float 1
The mud extrusion effect caused by No. 4 disturbs the field and has a negative impact on the already planted seedlings.
For this reason, it becomes necessary to lift the float 14 from the field surface, and then the traveling wheels 5 are moved further down beyond the range of vertical movement necessary for planting work, and the body is lifted together with the float. In this case, in the present invention, the bending operation of the first chain case 7 and the second chain case 6 (both chain cases 6, 7
becomes larger as the angle approaches the horizontal)
and the swinging motion of the swinging arm 9, the running wheel 5
The machine moves with a large rearward displacement from the above-mentioned linear up-and-down motion. Therefore, when the machine is lifted off the rice field, that is, with the float 14 floating above the rice field, the machine's center of gravity is aligned with the traveling wheels. It will be displaced forward with respect to 5. For this reason, the aircraft, which is set to the rear balance state to maintain the aircraft balance during planting work, changes to the front balance state, and as a result, the load at hand when lifting the aircraft, including the float, during turning. becomes smaller, allowing the operator to hold and support the operating handle with only a small amount of force, and the maneuverability of the machine is significantly improved, greatly reducing the workload on the operator. Furthermore, the running wheels 5 are supported in a distributed manner at two locations: the front swing support shaft 9a and the rear fulcrum shaft 10, so that the running wheels 5 can be reinforced.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and the means for ensuring a large backward movement amount of the running wheels 5 when the running wheels 5 are lowered when the aircraft is rotating include: For example, 4th~
It can also be constructed with a bent chain case like the one shown in Figure 6, and any of these can be used.

[Effect]

In summary, since the present invention is constructed as described above, the chain case for the traveling wheels becomes the first and second bent type chain cases, and the chain case is located at the rear of the fuselage side support shaft position. A second chain case is connected to a swinging arm that is pivotally supported on the machine body and extends forward, and the swinging of the swinging arm causes the running wheels to move in a substantially vertical direction within the range of vertical movement during rice field work. If the wheel is moved vertically and moved further down beyond the range of vertical movement during paddy field work, the running wheels will be displaced by a large amount of backward movement, and therefore,
When the machine is turning, the traveling wheels are displaced backward by a large amount of movement, and the machine is in a state of forward balance, which reduces the hand load of the worker who holds the operating handle, and the worker The machine can be supported by simply holding the operating handle with a small amount of force, and the maneuverability of the machine is significantly improved, greatly reducing the workload on the operator. Moreover, the running wheels have a distributed support structure in which they are supported on the body side by the front and rear support shafts of the first chain case and the swing arm, and as a result, the running wheels can also be reinforced.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking rice paddy work machine according to the present invention, in which Fig. 1 is a side view of the walking rice transplanter, Fig. 2 is an enlarged side view of the main parts, and Fig. 3 shows the main parts. FIG. 4 is a side view of another example of a walking rice transplanter, FIG. 5 is an enlarged side view of the main parts of the same, and FIG. 6 is an enlarged plan view of the main parts of the same. In the figure, 1 is a rice transplanter, 5 is a running wheel, 6 is a second chain case, 7 is a first chain case, and 9 is a swing arm.

Claims (1)

[Scope of utility model registration request] In a walk-behind paddy field work machine that maintains the machine body in a substantially constant working posture with respect to the field surface by vertical displacement of the running wheels, the base end of the vertical movement mechanism of the running wheels swings toward the machine body. a first chain case which is pivotably supported; a second chain case whose proximal end is bendably provided on the distal end side of the first chain case and a running wheel is pivoted on the distal end side; A swinging arm is swingably supported on the fuselage side at a position rearward of the swinging support shaft of the second chain case, and a swinging arm whose distal end side extends forward and is pivotally connected to the second chain case, The running wheels are swung around the pivot on the machine side of the swinging arm, and are moved up and down in the vertical direction during the range of vertical movement when working in paddy fields, and further down beyond the range of vertical movement when working in paddy fields. A walking type paddy field working machine characterized in that the running wheels are configured to be displaced by a large amount of backward movement when the vehicle is in use.