JPH0159854B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a swinging ground float is mechanically interlocked with an operating unit for raising and lowering a wheel by an aircraft-to-aircraft drive so that its posture on the ground is maintained almost constant, and the wheel is moved by the float. This invention relates to a walk-behind rice transplanter in which a main clutch operating tool is mechanically interlocked with a stopper that prevents a lowering operation of the machine body so that the stopper is in the operating position only when the main clutch is in the disengaged state.

The above-mentioned walk-behind rice transplanter is designed to automatically release the automatic lifting control of the wheels relative to the aircraft by detecting the rocking of the ground float when the main clutch is disengaged. In order to interlock the main clutch and stopper, conventionally, the main clutch and stopper have been separately interlocked and connected to the main clutch operating tool using two wires, rods, etc.

However, since there are two mechanical interlocking systems connected to the main clutch operating tool, the structure is complicated.

An object of the present invention is to simplify the interlocking structure from the main clutch operation tool by simple and rational improvement in view of the above-mentioned conventional situation.

A characteristic feature of the present invention is that, in the above-mentioned walk-behind rice transplanter, the stopper is attached to an interlocking member between the main clutch and its operating tool.

In other words, by simply attaching the stopper to the interlocking member between the main clutch and its operating tool, it is possible to integrate the interlocking structure from the operating tool into one system while the interlocking member is also used. In addition, the operation structure for the stopper can be greatly simplified, and a walking rice transplanter can be provided which is extremely advantageous in terms of manufacturing, assembly, and economy.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

As shown in FIG. 1, a front driving unit 4 and a pair of left and right rear extension wheels are attached to a fuselage frame 3 equipped with a pair of left and right propulsion wheels 1 and a ground leveling float 2 that supports the fuselage on the ground in cooperation with them. Departure control handle 5
and a slanted seedling stand 6 that moves back and forth horizontally with a constant stroke, and a plurality of pine-shaped seedlings W placed side by side on the seedling stand 6, one plant at a time from the lower end row of each. A seedling planting device 8 equipped with various devices such as a plurality of seedling claws 7 for taking out seedlings and planting them on the mud surface is attached to the rear of the aircraft frame 3, and as the aircraft moves, it sequentially plants multiple rows of seedlings. It consists of a walking rice transplanter that plants seedlings.

The pair of left and right propulsion wheels 1 connect the pair of left and right wheel transmission cases 9 to which they are attached to the hydraulic cylinder 1.
0, the left and right sides of the aircraft can be integrally swung around the transverse axis P of the aircraft, allowing for free lifting and lowering of the aircraft's drive, and the height of the aircraft above the ground can be changed depending on the driving situation. .

In addition to the wheel transmission case 9 being able to drive and oscillate in a right-and-left integral manner, it is configured to be able to freely swing left and right around the coaxial core P, so that during planting work, the wheel transmission case 9 is configured to be able to freely swing left and right around the coaxial core P. Even when the relative height of the two wheels 1 changes, the machine body and the planting device 8 are maintained in a substantially horizontal posture by the back-and-forth rocking motion.

The structure for lifting and lowering the wheel 1 relative to the aircraft will be described in detail below.

As shown in FIG. 2A, one sensor float 11 is installed at the center of the front end of the aircraft
are connected to each other so as to be able to freely swing around the transverse axis Q on the front end side thereof, and the swinging ends of an L-shaped swinging member 13 and the rear end of the sensor float 11 are interlocked and connected to the valve 12 for operating the hydraulic cylinder 10. part and rod 1
4, they are interlocked and connected. Then, the swinging end of the L-shaped swinging member 13 and the sensor float 11 are urged downward through the swinging contact member 15 that comes into contact with the upper side of the swinging end of the L-shaped swinging member 13. A coil spring 16 is provided for the purpose of planting, and planting travel is performed with a set ground load applied to the sensor float 11 by the coil spring 16, and based on the detection of the swing of the sensor float 11 due to changes in the depth of the plow. In other words, when the depth of the plow becomes deep and the sensor float 11 swings upward against the spring 16, the valve 12 is automatically operated.
The wheels 1 are automatically lowered relative to the machine, and when the plowing depth becomes shallow and the sensor float 11 swings downward, the wheels 1 are automatically raised relative to the machine and the planting device 8 is brought to an appropriate working height above the ground. The aircraft is configured to automatically ascend and descend in order to maintain this level.

The long hole accommodating portion 14a provided at the connecting portion of the rod 14 to the L-shaped swinging member 13 allows automatic operation of the valve 12 based on detection of swinging of the sensor float 11 when the planting device 8 is at an appropriate working height above the ground. This is to provide a dead zone, and is configured to prevent hunting during automatic aircraft elevation control.

The valve 12 is operated manually by operating a control lever 17 provided on the control handle 5, giving priority to automatic operation based on the detection of the rocking of the sensor float 11. The operation structure will be explained in detail in Figure 2 A, B, C, and D.

A locking pin 19 connects an arm 18 connected to the L-shaped swinging member 13 so as to be able to freely swing integrally thereto, and an end on the spring 16 acting side of the swinging abutment member 15 to the swinging abutment member 15 side. is engaged with a long hole 18a formed in the arm 18 for interlocking connection, and also pulls the operating lever 17 and the swinging contact member 15 in a direction that resists the spring 16. Interlockingly connected via 20,
By operating the operating lever 17, the following (a), (b), (c), (d)
It is configured to display four operating states.

(a) By operating the operating lever 17 to the automatic control position A, the wire 2
0 is loosened to allow the downward biasing of the sensor float 11 by the spring 16, and to position the locking pin 19 approximately in the middle of the elongated hole 18a when the valve 12 is in the neutral state, thereby increasing the flexibility of the elongated hole 18a. By allowing the arm 18 to swing with
The above-mentioned machine self-elevating control state allows vertical swinging of the mold swinging member 13 and automatically operates the valve 12.

(B) By operating the operating lever 17 to the pivot position N' and locking and holding it in the lever locking groove 21a formed at that position, the swinging abutment member 15 is moved to the spring 16 as shown in FIG. 2B. The sensor float 11 is held at a swinging position separated from the L-shaped swinging member 13 in the neutral state against the biasing force of At the same time, when the valve 12 is in the neutral state, the locking pin 1
9 is located at a position slightly offset from the middle part toward the elongated hole 18a, thereby maintaining the vertical swinging state of the L-shaped swinging member 13 due to the accommodation effect of the elongated hole 18a. The automatic operation of the valve 12 to the wheel-to-body downward side based on the upward swing detection of the machine body is maintained in a slightly upward position, and the sliding resistance of the soil leveling float 2 to the mud surface is reduced. This is a condition that allows the aircraft to turn smoothly.

(c) By operating the operating lever 17 to the fixed position N and locking and holding it in the lever locking groove 21b at that position, the swinging abutting member 15 can be moved against the spring 16 as shown in FIG. 2c. L in neutral state
While separating it largely from the mold swinging member 13,
When the valve 12 is in a neutral state, the locking pin 19 is held in a position where it contacts the end of the elongated hole 18a, and the locking action between the elongated hole 18a and the locking pin 19 causes the L-shaped swinging member 13 to A state in which the downward swinging from the neutral position is prevented, the operation of the valve 12 toward the wheel-to-airframe upward movement is checked, and the upward posture of the aircraft is maintained when traveling on the road.

(d) As the operating lever 17 is operated to the raised position U against the biasing force of the spring 16,
As shown in FIG. 2D, the elongated hole 18 of the locking pin 19
A state in which the L-shaped swinging member 13 is forcibly swung upward with a locking action on the a end, and the valve 12 is operated to the wheel-to-airframe downward side to forcibly raise the airframe when driving on the road.

Note that the operating lever 17 is also linked to a planting clutch (not shown) that operates intermittently to transmit power from the machine to the planting device 8.
7 to the automatic control position A, and the planting clutch is automatically engaged and operated by operating the operating lever 17 to other operating positions N', N, and U. It is configured so that the manual lifting/lowering operation of the machine body and the driving operation of the planting device 8 can be performed at the same time with a single operating lever 17 depending on the running condition.

The wheel lifting/lowering operating structure is also linked to a main clutch lever 22 attached to the control handle 5 in parallel with the lifting/lowering operating lever 17, and the linked operating structure with the main clutch lever 22 will be described in detail below.

The operating member 24a of the main clutch 24 and the main clutch lever 22 are interlocked and connected by a wire 26 disposed through the locking portion 18b at the upper swinging end of the arm 18.
A stopper 27 is attached to the wire 26, which comes into contact with and locks the locking portion 18b when the wire 26 is cut (that is, the wire 26 is pulled),
As shown in FIG. 2C, at the main clutch lever 22 cutting operation portion, the arm 18
In addition, by checking the swinging of the L-shaped swinging arm 13, the operation of the valve 12 toward the wheel-to-body lowering side is automatically prevented, and, for example, the sensor float 11 is The system is configured to detect this and prevent the aircraft from automatically ascending unexpectedly.

Also, the stopper 27 is connected to the main clutch 24.
By directly attaching the main clutch lever 22 to the wire 26 that interlocks and connects the main clutch lever 22 with the main clutch lever 22, the main clutch lever 22 can be connected to the main clutch 24 and the stopper 27 while the wire 26 is also used.
The interlocking structure from 1 to 1 is set to one system, and the interlocking structure is configured to be simplified.

The automatic operation structure of the wheel-to-airframe lifting operation valve 12 based on the detection of the rocking of the sensor float 11 and the specific structure of the manual operation structure can be changed in various ways, and the stoppers 27 and The specific linking structure with the valve 12 can also be modified in various ways.

Furthermore, the main clutch lever 22 and the main clutch 24
The interlocking member 26 that interlocks can also be changed in various ways, such as using a rod instead of a wire, and the structure for attaching the stopper 27 to the interlocking member 26, the shape of the stopper 27, etc. can also be changed in various ways. is possible.

The present invention is directed to various types of walk-behind rice transplanters that are equipped with a mechanism for automatically raising and lowering wheels relative to a machine body based on detection of rocking of a sensor float.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the walking rice transplanter according to the present invention, and FIG. 1 is an overall side view, and FIG. 2 is a, b, c, and c.
D is a diagram showing the operating state of the wheel-to-body lifting operation structure. 1...wheel, 11...ground float, 12...
Operation section, 22... Main clutch operation section, 24... Main clutch, 36... Interlocking member, 27... Stopper.

Claims (1)

[Claims] 1 Operation unit 12 that raises and lowers the wheels 1 by driving against the aircraft
A main clutch operation tool 22 is attached to a stopper 27 that mechanically interlocks the swinging grounding float 11 so that its posture on the ground is maintained substantially constant, and prevents the float 11 from lowering the wheel 1 relative to the aircraft.
is a walk-behind rice transplanter mechanically interlocked so that the stopper 27 is in the operating position only when the main clutch 24 is in the disengaged state, and the stopper is connected to an interlocking member 26 between the main clutch 24 and its operating tool 22. A walk-behind rice transplanter characterized by having 27 attached.