JPH0225Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention raises the planting device when the operating lever is operated to one end position of the operating route, and the operating lever is moved to the middle of the operating route on the opposite side from the raising operating position. When the planting device is operated to the raised/lowered position, the planting device is stopped moving up and down, and the operating lever is located at the other end of the operating path opposite to the raised operating position and close to the raised/lowered stop operating position. A drive mechanism is provided that automatically raises and lowers the planting device so that the planting depth is maintained within a set range when the planting device is operated to a position including a first operating region and a second operating region located far away; The operation lever and the planting clutch, which is biased to the engaged state, are moved in conjunction with the movement of the operation lever at the automatic lifting operation position to a second operation area on the side far from the lifting stop operation position. is provided with an interlocking mechanism for reversibly entering and operating, and when the planting device rises to the upper limit of its lifting range with the operating lever being operated to the raising operation position, the operation The present invention relates to a lifting operation device for a rice transplanter, which is equipped with a mechanism for automatically returning the lever to the lifting stop operation position.

In the conventional raising/lowering operation device for the planting device of such a rice transplanter, only a biasing force for biasing the planting clutch to the engaged state was applied to the operating lever, but when using this, The operation stroke of the operating lever to engage and close the clutch naturally becomes larger due to its combination with the lifting drive mechanism, and when operating the planting clutch to engage, the operating lever can be operated reliably to the planting clutch engaged position. If the driver did not do so, he would take his hand off the operating lever in the middle of the operation, and as a result, there was a possibility that the clutch would engage unconsciously and say that it was not being operated.

In particular, when the planting device rises to the upper limit of its lifting range, the automatic return of the operating lever from the lifting operation position to the raising/lowering stop operation position via the automatic return mechanism should not go too far toward the automatic raising/lowering operation position. In order to ensure that the planting clutch is operated without any resistance, and to enable each operation of the operating lever from the automatic lift operation position to the lift stop operation position and from the lift stop operation position to the lift operation position to be performed easily and with little resistance, the planting clutch is It is not possible to increase the force that urges the lever toward the engaged state, and the operating lever is naturally subject to considerable operating resistance due to friction.

Therefore, when using the conventional device, if the operation lever is released in the middle of the operation due to the worker's carelessness when the planting clutch is engaged, the operation lever will not be activated when the planting clutch is engaged. The plants did not move to the desired position and remained stopped in the middle, and the planting work was carried out against the wishes of the workers with the planting device not operating, resulting in a large number of missing plants. There was a drawback.

The purpose of the present invention is to overcome these conventional drawbacks.

The planting device lifting/lowering operating device of the rice transplanter according to the present invention allows the operating lever to engage the planting clutch only when the operating lever is in the operating position in the second operating area of the operating path where the planting clutch is engaged. It is characterized by being equipped with a mechanism that applies a moving force to a position.

According to the characteristic configuration of such a device, a moving force applying mechanism is provided that moves the operating lever located in the second operating area to the planting clutch engaged operating position against the movement resistance acting on the operating lever. from,
Although the operating stroke of the operating lever for engaging and disengaging the planting clutch is large, and the biasing force for engaging the planting clutch is small, the operating lever is operated and moved to the second operating area with a small stroke, and With a lever operation that can be easily performed, the planting clutch can be reliably engaged and operated, thereby preventing the occurrence of stock loss. Moreover, since the moving force applying mechanism applies a moving force only to the operating lever located in the second operating area, the moving force is applied to the operating lever to move the operating lever to the planting clutch engagement position. As a result, each operation of the operating lever from the up/down stop operation position to the up/down operation position and from the first operation area to the up/down stop operation position can be performed easily without being heavy, and the operation can be performed easily from the up/down operation position of the operation lever. Automatic return to the lifting/lowering stop operation position can be reliably performed without going too far.

Therefore, with the present invention as a whole, the planting device can be raised and lowered and the planting clutch can be engaged and closed easily and reliably.

Hereinafter, embodiments of the present invention will be described based on the drawings.

A riding rice transplanter in which a multi-row planting device 5 is connected to the rear of a main traveling machine 4 equipped with running wheels 1, a driver's seat 2, a steering handle 3, etc. via a link mechanism 6 so that it can be raised and lowered. In, the planting device 5
The lifting/lowering operation device for this includes a single swinging operating lever 7, a drive mechanism 8 that raises and lowers the planting device 5 using a hydraulic cylinder 8A as an actuator, and a drive mechanism 8 that moves the planting device 5 up and down in conjunction with the swinging of the operating lever 7 to enter the entry state. Interlocking mechanism 10 for turning on and off the energized planting clutch 9
and a mechanism 11 that switches the elevating drive mechanism 8 to an elevating stop state when the planting device 5 rises to the upper limit of its elevating range.

When the operating lever 7 is operated to one end position PU of the operating path A, the elevating drive mechanism 8
When the planting device 5 is raised and the operating lever 7 is operated to the intermediate position PN of the operating path A on the opposite side from the raising operating position PU, the planting device 5 is stopped rising and falling, and the operating lever 7 is moved up and down. 7 is a position on the other end side of the operating path A opposite to the lifting operation position PU, including a first area a located close to the lifting stop operation position PN and a second area b located far away from the lifting operation position PN. When operated by the PO, the planting device 5 swings up and down in response to fluctuations in planting depth based on the detection by the planting depth detection sensor 12 that is attached to the planting device 5 and also serves as a soil leveling float. 5 is automatically raised and lowered so that the planting depth is maintained within a set range, and specifically, it is configured as follows.

In other words, by swinging in conjunction with the vertical swing of the sensor 12, when the sensor 12 is in a posture corresponding to the set planting depth, the spool 8a of the spool valve 8B relative to the hydraulic cylinder 8A is moved to the neutral state where it stops raising and lowering. When the sensor 12 is positioned at position N and the sensor 12 is in a posture corresponding to a planting depth deeper than the set planting depth, the spool valve 8B is positioned at the raised position U and the sensor 12 is positioned at a planting depth shallower than the set planting depth. When the spool valve 8B is in the horizontal position, the sensitivity of the sensor 12 is set by the cooperation of the first arm 8C that positions the spool valve 8B at the lowered position D and the spring D that biases the spool valve 8B toward the upper position U. The spring 8E swings and urges the sensor 12 downward, and the operating lever 7 is in the raised operating position.
When the spool valve 8B is in the PU operating position, the spool valve 8B is pressed and held in the raised position U against the weight of the sensor 12, etc., and when the operating lever 7 is in the lifting stop operating position PN, the spool valve 8B is in the raised position. When the spool valve 8B is pressed and held at the neutral position N in a state allowing movement to U, and the operating lever 7 is operated at the automatic raising/lowering operation position PO, the spool valve 8B is moved to the raised position U, the neutral position N, and the lowered position. In order to allow movement between positions D, a second arm 8F is provided that swings together with the operating lever 7 around the same axis X as the first arm 8C. 8G is a wire that connects the sensor 12 with the first arm 8C, and 13 is a wire that connects the sensitivity setting spring 8.
This is an operating lever for adjusting the biasing force exerted by E, that is, the setting sensitivity.

The interlocking mechanism 10 is a second
The planting clutch 9 is reversibly engaged and operated in conjunction with the swinging to the operation area b, and is in the raised operation position
The operating lever 7 and the planting clutch 9 are linked together so that the operating lever 7 can be unstablely switched by the biasing force of the planting clutch 9 with a dead point between the PU and the lifting stop operation position PN, A rod 10A is pivotally connected to the arm 7a connected to the boss 7A of the operating lever 7, and a rod 10 is connected to the planting clutch 9.
A relay link 10C, which is linked via a spring 10D, is connected to the relay link 10C via a spring 10D.

The mechanism 11 includes a boss 7 of the operating lever 7.
It is pivotally connected to an arm 7b connected to A, and when the planting device 5 rises to the upper limit of its lifting range with the operating lever 7 being operated to the lifting operation position PU, the a rod 11A that is pressed by a link 6A of the link mechanism 6 via a spring 11a to press and swing the arm 7b, that is, the operating lever 7 toward the lifting stop operating position PN;
When the operating lever 7 is at the lifting/lowering stop operating position PN, the hole 1 formed in the second arm 8F
1b is provided with a spring ball 11B of a detent mechanism that elastically engages from the direction along the axis X and holds the operating lever 7 at the lifting/lowering stop operation position PN, so that the planting device 5 reaches the upper limit of the lifting range. The control lever 7 is configured to automatically return to the lifting/lowering stop operating position PN when the lifting lever 7 is lifted up to this point.

Therefore, only when the operating lever 7 is placed in the planting clutch engaging operating position P of the second operating area b, the operating force is applied to the operating lever 7 to move to the planting clutch engaging operating position P. A mechanism 13 for applying is provided.

The moving force applying mechanism 13 is provided with a spring ball 13A, and is pressed from the direction along the axis X by the spring ball 13A to move the second arm 8F, that is, the operating lever 7 to the planting clutch engaged operating position. The second arm 8F is configured with a cam surface 13B that generates a force to move it toward the P side, and the spring ball 13A moves the operating lever 7 to the lifting/lowering stop operation position.
It is also configured to have the aforementioned spring ball 11B held in the PN. and the cam surface 1
3B is also configured to have a part of the circumferential surface of the hole 14 into which the spring ball 13A is inserted to position the operating lever 7 when the operating lever 7 is in the planting clutch engaged operating position P. There is.

P' is the automatic lifting/lowering operation position of the operating lever 7 configured in the first operating area a when the planting clutch is in the disengaged state.

According to the configuration of the above embodiment, the operation lever 7 is not operated and swung to the planting clutch engaged operation position P, but only the operation lever 7 is operated and swung to the second operation area b portion, and the operation is not performed thereafter. Even when released, the operating lever 7 can be moved to the planting clutch engaged operating position P by the moving force applying mechanism 13.

FIGS. 7 and 8 show another embodiment, which
The cam surface 13B is configured to extend over the entire second operation area b.

[Brief explanation of the drawing]

Figures 1 to 6 show examples, Figure 1 is a side view of the rice transplanter, Figure 2 is an operation system diagram, Figure 3 is a side view of the main parts, and Figure 4 is a vertical front view of the main parts. 5 is a sectional view taken along the - line in FIG. 4, and FIG. 6 is a sectional view taken along the - line in FIG. 7th
8 show another embodiment, FIG. 7 is an enlarged side view of the main part, and FIG. 8 is a sectional view taken along the line - in FIG. 7. 7... Operating lever, A... Operating path, PU...
Lifting operation position, 5... Planting device, PN... Lifting stop operation position, a... First operating area, b... Second operating area, PO... Automatic lifting operation position, 8... Drive mechanism, 9 ...Planting clutch, 10...Interlocking mechanism,
11... Automatic return mechanism, P... Planting clutch engaged operation position, 13... Movement force imparting mechanism.

Claims (1)

[Scope of claim for utility model registration] The operating lever 7 is located at one end of its operating path A.
Raise the planting device 5 when operated by the PU,
When the operating lever 7 is operated to the intermediate position PN of the operating path A on the opposite side from the raising operating position PU, the planting device 5 is stopped moving up and down, and the operating lever 7 is moved to the raising operating position PU.
On the other end side of the operation path A opposite to the PU, it is operated to a position PO that includes a first operation area a located close to the lifting stop operation position PN and a second operation area b located far away. At this time, a drive mechanism 8 is provided to automatically raise and lower the planting device 5 so that the planting depth is maintained within a set range, and the control lever 7 and the planting clutch 9 biased to the engaged state are provided. , so that the planting clutch 9 is reversibly engaged and operated in conjunction with the movement of the operating lever 7 from the automatic raising/lowering operating position PO to the second operating area b on the far side from the raising/lowering stop operating position PN. An interlocking mechanism 10 is provided to cause the operation lever 7 to move to the raising operation position.
A planting device for a rice transplanter, which is provided with a mechanism 11 that automatically returns the operating lever 7 to the lifting stop operation position PN when the planting device 5 rises to the upper limit of its lifting range while being operated by a PU. In the lifting operation device, only when the operating lever 7 is placed in the second operating area b of the operating path A where the planting clutch 9 is entered, the operating lever 7 is moved to the operating position P where the planting clutch 9 is entered. A planting device lifting/lowering operating device for a rice transplanter, characterized in that it is provided with a mechanism 13 that provides a moving force. The raising and lowering operation device for a planting device for a rice transplanter according to claim 1, wherein the raising and lowering drive mechanism 8 is a hydraulic mechanism using a hydraulic cylinder 8A as an actuator. The moving force applying mechanism 13 is composed of a spring ball 13A and a cam surface 13B that is pressed by the spring ball 13A and generates a component force that moves the operating lever 7 to the planting clutch engaged operating position P side. A planting device lifting/lowering operating device for a rice transplanter according to claim 1 or 2 of claim 1, which is a utility model registration. The spring ball 13A of the moving force applying mechanism 13 also serves as the spring ball 11B of a detent mechanism for holding the operating lever 7 at the lifting/lowering stop operation position PN. A device for lifting and lowering the planting device of the rice transplanter described above.