JPH0160211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mechanism to mechanically control a swinging grounding float, which is biased toward the grounding side by a spring, in an operation unit that raises and lowers the wheel by driving it against the aircraft, so that its attitude toward the ground is maintained almost constant. a check member that mechanically interlocks the human operating tool and acts on the spring so that it is switched to a non-acting state or a substantially non-acting state with respect to the float; This invention relates to a walking rice transplanter that mechanically interlocks human operating tools.

By switching the spring to a non-active state, the above-mentioned walk-behind rice transplanter makes the lifting control of the wheels to the machine body sensitive based on the detection of the rocking of the ground floats, and maintains the machine body in a slightly ascending position. This allows the aircraft to turn easily while reducing the sliding resistance against the surface.
Conventionally, a wheel lifting/lowering operating section and a restraining member have been separately interlocked and connected to a human operating tool using two wires, rods, or the like. However, since there are two interlocking systems from the human operating tool, there is a drawback that the structure is complicated.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional situation, an object of the present invention is to simplify the interlocking structure from the human operating tool through simple and rational improvements.

A characteristic feature of the present invention is that, in the walking rice transplanter described above, the restraining member is attached to an interlocking member between the human operating tool and the operating section.

In other words, by simply attaching a restraining member to the interlocking member between the human operating tool and the operating section, the interlocking structure from the human operating tool can be integrated into one system while the interlocking member is used for both purposes. The operating structure for the parts and restraining members can be greatly simplified, and it has become possible to provide a walking-type rice transplanter that is extremely advantageous in terms of production and assembly as well as in terms of economy.

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

As shown in FIG. 1, a pair of left and right propulsion wheels 1,
The fuselage float 3 is equipped with a ground leveling float 2 that supports the aircraft on the ground in cooperation with the fuselage float 3, and is provided with a front driving unit 4 and a pair of left and right rearwardly extending control handles 5, and is capable of horizontal reciprocating with a constant stroke. A plurality of seedlings are taken out one by one from the lower end row of each of the plurality of pine-shaped seedlings W placed side by side on the seedling platform 6 and planted on the mud surface. A seedling planting device 8 equipped with various devices such as a seedling planting claw 7 is attached to the rear of the machine frame 3, thereby forming a walking rice transplanter that sequentially plants multiple rows of seedlings as the machine moves. It has been done.

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 aircraft can be freely moved up and down by swinging around the horizontal axis P of the aircraft on both the left and right sides, and the height of the aircraft above the ground can be changed according to the driving situation. be.

In addition, the wheel transmission case 9 is configured to not only drive and oscillate in a pair of left and right directions, but also to be able to freely swing left and right around the coaxial core P. Even when the relative height of both wheels 1 changes, the machine body and the planting device 8 are configured to be 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 moves 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.

In addition, the elongated 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 the swinging detection of the sensor float 11 when the planting device 8 is at the appropriate working height above the ground. This is to provide a dead zone in the airframe, and is designed to prevent hunting during automatic aircraft elevation control.

In order to operate the valve 12, priority is given to automatic operation based on the detection of the swinging of the sensor float 11, so that the valve 12 can be manually operated by operating a control lever 17 provided on the operating handle 5; 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,
It is constructed so that the following four operating states A, B, C, and D can be brought out by operating the operating lever 17.

(a) By operating the operating lever 17 to the automatic control position A, the wire 2
0 is loosened to allow the downward bias of the sensor float 11 by the spring 16, and
When the valve 12 is in a neutral state, the locking pin 19 is located approximately in the middle of the elongated hole 18a, and the elongated hole 18a allows the arm 18 to swing, thereby detecting the biased state of the spring 16. The above-mentioned automatic body elevation control state allows the L-shaped swinging member 13 to swing up and down based on the detection of the swinging of the float 11, and automatically operates the valve 12.

(b) By operating the operating lever 17 to the swing position N' and locking and holding it in the lever locking groove 21a formed at that position, the swinging abutting member 15 is moved as shown in FIG. 2b. The sensor float 11 is held in a swinging position separated from the L-shaped swinging member 13 in the neutral state against the biasing force of the spring 16, and the biasing action of the sensor float 11 by the spring 16 is released.
The set grounding load of the sensor float 11 is set to approximately 0, and the locking pin 19 is located at a position slightly offset from the middle part of the elongated hole 18a when the valve 12 is in the neutral state. The vertical swinging state of the L-shaped swinging member 13 is maintained, and the automatic operation of the valve 12 to the wheel-to-aircraft downward side based on the detection of the upward swinging of the sensor float 11 is made sensitive to the airframe and the planting device. 8 is maintained in a slightly upward position, and the sliding resistance of the ground leveling float 2 against the mud surface is reduced, and the aircraft turns 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 abutment member 15 is attached to the spring 16 as shown in FIG. 2c. The locking pin 19 is moved far away from the L-shaped swinging member 13 in the neutral state while the valve 12 is in the neutral state.
The L-shaped swinging member 13 is prevented from swinging downward from the neutral position by the locking action between the slotted hole 18a and the locking pin 19. This is a state in which the operation of the valve 12 toward the wheel-to-body lifting side is restrained, and the rising attitude 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, the elongated hole 18a of the locking pin 19 opens as shown in FIG. 2D.
An L-shaped swinging member 1 with a locking action on the end.
3 is forcibly swung upwards, the valve 12 is operated to the wheel-to-aircraft downward direction, and the aircraft is forcibly raised 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, the planting clutch is automatically engaged, and the planting clutch is automatically engaged when the operating lever 17 is operated to the other operating positions (N', N, U). The clutch is configured to be automatically disengaged, and a single operating lever 17 can be used to manually raise and lower the machine body and drive the planting device 8 at the same time depending on the running condition.

Reference numeral 27 in the figure is a coil spring attached to a wire 26 that interlocks and connects the main clutch lever 22 and the operating member 24a of the main clutch 24. As shown in FIG.
8b, and the engagement between the locking pin 19 and the elongated hole 18a in conjunction with the operation of the lifting operation lever 17 to the fixed position N, which is performed prior to the operation of disconnecting the main clutch lever 22. Due to these two actions, when the main clutch lever 22 is disconnected, the automatic lifting and lowering operation of the valve 12 is automatically checked.
For example, when replenishing seedlings, the sensor float 11
In order to reliably prevent the machine from automatically lifting or lowering unexpectedly, and if it is necessary to raise the machine with the main clutch in the disengaged position to adjust the height of seedling supply, etc., the coil spring 2
The structure is such that the body can be forcibly raised by operating the lifting operation lever 17 against the biasing force 7.

In summary, the swing abutment member 15 that acts to switch the biasing action of the ground load setting coil spring 16 on the sensor float 11 between the active state and the non-active state in accordance with the operation of the operating lever 17, The operating lever 17 and the valve 12
By directly attaching it to the wire 20 that interlocks and connects the valve 12 and the swinging contact member 15, the interlocking structure from the operating lever 17 to the valve 12 and the swinging contact member 15 is made into one system, while the wire 20 is used for both purposes.
It is configured to simplify the interlocking structure.

Incidentally, the spring 16 for setting the ground contact load of the sensor float 11 can be arranged in various ways as shown in FIG. 3A or 3B.

Also, the sensor float 11 of the spring 16
In place of the swing abutting member 15, members having various shapes and various operating structures may be used as a member that acts to switch the biasing action between the operating state and the non-acting state as the operating lever 17 is operated. possible, and these members are collectively referred to as the restraining member 15.

Furthermore, the interlocking member 20 that interlocks the operating lever 17 and the valve 12 can be modified in various ways, such as using a rod or link instead of a wire. The mounting structure can also be modified in various ways.

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.
FIG. 3A and FIG. 3B are diagrams showing different embodiments, respectively. 1...wheel, 11...ground float, 12...
Operation unit, 15... check member, 16... spring, 17... human operating tool, 20... interlocking member.

Claims (1)

[Claims] 1 Operation unit 12 that raises and lowers the wheels 1 by driving against the aircraft
Then, the swinging grounding float 11, which is urged toward the grounding side by the spring 16, is mechanically interlocked so that its posture on the ground is maintained almost constant, and the human operating tool 17 is mechanically interlocked, so that the spring 16 A walk-behind rice transplanter in which the human operating tool 17 is mechanically linked to a restraining member 15 that acts on the float 11 so that it is switched to a non-acting state or a substantially non-acting state with respect to the float 11. And,
Interlocking member 2 between the human operating tool 17 and the operating section 12
A walking rice transplanter characterized in that the restraining member 15 is attached to the 0.