JPH0220899Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is designed to detachably attach a seedling planting device to a traveling vehicle body, and to reduce the power transmission to the seedling planting device when the load on the seedling planting device exceeds a certain level. A riding type vehicle equipped with a safety clutch that automatically shuts off, and a fixed position stop clutch that can cut off the transmission to the seedling planting device only when the seedling planting claw of the seedling planting device is in the fixed position. Regarding rice transplanters.

[Conventional technology]

Regarding the above-mentioned riding type rice transplanter, for example, one configured as described below is known. That is, as shown in FIG. 8, inside the mission case 5, there is a PTO shaft 17 that transmits power to the seedling planting device and a PTO transmission shaft 16 that is interlocked with the shaft 17.
A safety clutch S and a fixed position stop clutch T are interposed in series. Safety clutch S is
They come into contact with each other via a plurality of balls 23. Respectively
Two discs 22 fitted onto the PTO transmission shaft 16,
24, and when a load on the seedling planting device exceeds a certain level, the locking state of both discs 22 and 24 by the ball 23 is released, thereby interrupting power transmission to the seedling planting device. Also, fixed position stop clutch T
A notch 18a is formed on the outer periphery of one end of the clutch piece 18 which is movable in the axis _P0 direction by the shifter 21, and the check pin 20 screwed to the transmission case 5 fits into the notch 18a. It is designed so that the power transmission to the seedling planting device can be cut off only when the seedlings are planted (see Japanese Utility Model Application Publication No. 111352/1983).

[Problem that the invention attempts to solve]

However, in the case of the above-mentioned conventional configuration, there is a possibility that the following disadvantages may occur, and there is room for improvement.

In other words, it is not possible to try to make the running vehicle more versatile by connecting other working devices such as a rotary tiller or grass cutting device instead of the seedling planting device during times other than the rice planting season. It is done. However, when a rotary tiller or the like, which has a larger work load than a seedling planting device, is connected, the above-mentioned conventional configuration cannot adjust the load related to the operation of the safety clutch S, so the work load is relatively small. Even in this state, the safety clutch S is activated and power transmission to the working device is cut off. Therefore, it has been virtually impossible to use working devices with heavy workloads.

On the other hand, even when a mowing device or the like that does not have a large workload is connected, the power transmission cutoff/limiting function by the fixed position stop clutch T is not necessary.
On the contrary, this results in a delay in stopping the drive of the working device. Therefore, it may be possible to cancel the limiting function, but in the conventional configuration described above, the check pin 20 screwed to the mission case 5 had to be removed one by one, which was cumbersome to operate.

In view of the above-mentioned circumstances, the purpose of this invention is to improve the functions of the safety clutch and fixed position stop clutch in order to make the traveling vehicle more versatile by connecting other work devices instead of the seedling planting device. The purpose is to make it possible to release it with a simple operation.

[Means for solving problems]

The characteristic configuration of the riding-type rice transplanter according to the present invention is that when the load on the seedling planting device, which is removably attached to the vehicle body, exceeds a certain level, the safety clutch automatically cuts off the power transmission to the seedling planting device, which prevents the power transmission from being cut off. and a mechanism for canceling the transmission cut-off limited state by a fixed position stop clutch that can cut off the power transmission to the seedling planting device only when the seedling planting claw of the seedling planting device is in the fixed position,
Both mechanisms can be operated simultaneously by one operating tool, and the effects are as follows.

[Effect]

In other words, if the regulation mechanism for the safety clutch is activated, the power transmission to the work equipment will not be automatically cut off even if the work load increases to a certain extent, so even work equipment with a relatively heavy work load can be carried by the vehicle. It can be used in conjunction with. Further, by activating the release mechanism for the fixed position stop clutch, the power transmission to the working device can be interrupted at any time.

[Effect of idea]

As a result, when connecting various work devices to the traveling vehicle body in place of the seedling planting device during periods other than the rice-planting season, rotary tillers and other drive-type work devices that could not be used in the past have become available. It became possible to use this equipment, making it possible to make the vehicle body more versatile. In addition, when the working device is connected, the power transmission to the working device can be cut off at any time, so there is no delay in stopping the driving of the working device, and as a result, work efficiency can be improved.

Furthermore, since both mechanisms can be operated at once with one operating tool, the operation is easier than when separate operating tools are provided for both mechanisms, and it is easier to forget to operate one of the mechanisms. Without a problem,
Overall, it has become possible to provide a riding-type rice transplanter with excellent versatility and workability.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 4, an engine 4, a transmission case 5, and a passenger driving section 6 are mounted on a running vehicle body 3 that pivotally supports a pair of left and right steering front driving wheels 1 and a pair of left and right driving rear wheels 2, respectively. Equipped with etc. A link mechanism 8 that is vertically swingable by a cylinder 7 is provided at the rear of the traveling vehicle body 3, and a seedling planting device 9 is detachably attached to the rear end of the link mechanism 8. A transmission shaft 11 extends between the transmission case 5 of the traveling vehicle body 3 and the seedling planting transmission case 10 of the seedling planting device 9.
can be freely divided at the intermediate joint part 11a, and by connecting various working devices to the link mechanism 8 instead of the seedling planting device 9 during periods other than the rice planting season, the traveling vehicle body 3 can be used for general purposes. This is a riding-type rice transplanter that can be used to increase the number of rice transplanters.

The seedling planting device 9 includes an inclined seedling platform 12 that reciprocates laterally, a pine that guides and supports the lower end of the inclined seedling platform 12 in a relatively slidable manner, and projects downward from the seedling platform 12. A sliding rail 13 that receives the lower end of the seedling M, reciprocatingly moves up and down so as to pass through a seedling taking opening 13a formed in this rail 13,
It consists of a seedling planting claw 14 that cuts out one seedling at a time from the pine seedlings M on the seedling table 12 and plants them on the field surface, and a plurality of soil leveling floats 15 that level the field surface to be planted. . As shown in FIG. 5, on the inclined side surface of the sliding rail 13, there are protrusions 13 that are continuous in the sliding direction of the seedling stand 12.
A plurality of b are formed at appropriate intervals in the pine seedling feeding direction. Each protrusion 13b consists of two surfaces, a surface Q that is gently sloped when viewed in cross section on the upper side for feeding pine seedlings, and a surface R that is steeply sloped when viewed in cross section on the lower side for feeding pine seedlings, and these surfaces R and S intersect. By receiving the pine seedlings M at the top, the pine seedlings M are sent downward in the figure with little resistance.

As shown in FIG. 1, inside the transmission case 5, a PTO transmission shaft 16 that transmits power after shifting
A PTO shaft 17 is interlocked via a safety clutch S and a fixed position stop clutch T. The fixed position stop clutch T has a disc-shaped clutch piece 18 that is slidable in the axis _P1 direction of the PTO shaft 17 and rotates integrally with this shaft 17, and a clutch pawl 19a that engages with this clutch piece 18. It also includes a claw gear 19 that loosely fits onto the PTO shaft 17. Then, as shown in Fig. 2, the clutch piece 1
Two notches 18a are formed 180 degrees apart on the surface opposite to the surface facing the claw gear 19 of No. 8, and the check pin 20 is fitted into either of the notches 18a. It is provided on the outer wall of the transmission case 5, and only when the check pin 20 is engaged with one of the notches 18a, the clutch piece 18 can be moved by operating a shift fork 21 linked to a clutch lever (not shown). It is constructed so that it can be slid to interrupt transmission. In other words, one rotation of the PTO shaft 17 causes the seedling planting claw 14 of the seedling planting device 9 to rotate twice.
By forming two notches 18a in the clutch piece 18 of the fixed position stop clutch T, corresponding to the state in which the seedling planting claw 14 is positioned upward, Only when the seedling planting claw 14 is above, that is, away from the ground surface,
It is constructed so that transmission to the PTO shaft 17 can be interrupted. The safety clutch S includes a disc-shaped clutch piece 22 that is slidable in the axis _P2 direction of the PTO transmission shaft 16 and rotates integrally with the shaft 16, and a plurality of balls 23 on the clutch piece 22. The clutch boss 24 is in opposing contact with the PTO transmission shaft 16 via the clutch boss 24 and is loosely fitted onto the PTO transmission shaft 16. The gear portion 2 formed on this clutch boss 24
4a is the claw gear 19 of the fixed position stop clutch T.
It is always in occlusion. The clutch piece 22 is normally biased by a spring 25 so that it interlocks with the clutch boss 24 through engagement with a ball 23, and when the rotational torque on the clutch boss 24 side exceeds a certain level due to overload on the PTO shaft 17, the spring Overcoming the biasing force caused by 25, the ball 23
The clutch boss 24 is disengaged from the clutch boss 24, thereby interrupting transmission. In the figure, 34 is a nut for adjusting the biasing force of the spring 25.

A check arm 26 is provided with one end facing the clutch piece 22 of the safety clutch S, and the middle part of the check arm 26 is attached to the transmission case 5 with its axis.
Attached so that it can swing freely around P ₃ , check arm 26
A wire 27 is attached to the other end of the transmission case 5 protruding outside. That is, by pulling this wire 27, the check arm 26 is swung against the spring 28, and the clutch piece 22 is forcibly pressed against the clutch boss 24, so that the rotational torque on the clutch boss 24 side exceeds the set value. It is constructed so that the transmission can remain uninterrupted even when the seedlings are planted, and instead of the seedling planting claws 9, it is possible to connect a working device with a relatively large workload such as a rotary tiller. It's like this.

Further, as shown in FIG. 2, the restraining pin 20 that engages with the notch 18a formed in the clutch piece 18 of the fixed position stop clutch T is set at a position where it engages with the notch 18a and where it does not engage with the notch 18a. At the end of the pin 20, which is inserted into the boss part of the mission case 5 and protrudes outside the mission case 5, there is an operating arm that can freely swing around the axis _P4. One end of 29 is attached.
A wire 30 is attached to the other end of the operating arm 29, and by pulling the wire 30, the restraining pin 20 is moved against the spring 31 to a position where it does not engage with the notch 18a. This is designed to create a state where the clutch can be operated at any time.

Then, as shown in Fig. 3, the safety clutch S
A wire 27 for swinging the check arm 26 and a wire 30 for moving the check pin 20 of the fixed position stop clutch T are connected to one operating lever 32 provided in the driving section 6.
They are connected via an interlocking mechanism 33, and by operating this lever 32, the above-mentioned pressing operation of the clutch piece 22 by the check arm 26 and the check pin 2
The structure is such that the 0 pulling operation can be performed at the same time.

The configuration for pressing the clutch piece 22 of the safety clutch S against the clutch boss 24 is such that the clutch piece 22 is directly pulled toward the clutch boss 24 side by a wire 27 instead of using the check arm 26 as in the above-mentioned embodiment. Good too,
These will be referred to as regulatory mechanism X. Alternatively, a wire 30 may be directly attached to the check pin 20 of the fixed position stop clutch T, and the check pin 20 may be moved by pulling the wire 30. This is referred to as a release mechanism Y. Further, the regulating operation for the safety clutch S and the releasing operation for the fixed position stop clutch T by both mechanisms X and Y may be performed by operating one member, and an example thereof will be shown below.

As shown in FIGS. 6 and 7, a notch 18 formed in the clutch piece 18 of the fixed position stop clutch T
A restraining member 35 that engages with a is attached to the mission case 5 so as to be swingable around an axis _P4 . A wire 34 interlocking with the operating lever 32 is attached to the free end side of the check member 35, and is biased by a spring 36 toward the engagement side with the notch 18a. By pulling this wire 34, the check member 35 is swung to the position shown by the dashed line in FIG.
A state in which the transmission can be cut off by operation 1 is created, and the lost end of the restraining member 35 is brought into contact with the boss portion 22a connected to the clutch piece 22 of the safety clutch S, so that the clutch of the safety clutch S is closed. It is configured to prevent the piece 22 from moving toward the transmission cutoff side. The parts having the same configuration as the previous embodiment are as follows.
Drawings and descriptions are omitted.

Further, in order to operate both mechanisms X and Y, a pedal may be provided in the operating section 6 instead of the operating lever 32, and these pedals are referred to as operating tools 32. Further, this operating tool 32 does not necessarily need to be provided in the driving section 6, and may be provided directly in the mission case 5.

The specific configurations of the safety clutch S and the fixed position stop clutch T can be changed as appropriate. For example, the clutch piece 22 of the safety clutch S and the clutch boss 24 may be brought into opposing contact with each other via an inclined surface.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the riding rice transplanter according to the present invention, FIG. 1 is a sectional view of the transmission case, FIG. 2 is a sectional view taken along the line - in FIG. 1,
FIG. 3 is a schematic diagram showing the operating structure of the regulating mechanism and interlocking mechanism, FIG. 4 is an overall side view of the riding rice transplanter, and FIG. 5 is an enlarged perspective view of the vicinity of the seedling opening. 6 and 7 show another embodiment of the present invention, respectively.
FIG. 3 is a sectional view corresponding to FIG. FIG. 8 is a sectional view corresponding to FIG. 1 showing a conventional example. 3... Traveling vehicle body, 6... Driving unit, 9... Seedling planting device, 14... Seedling planting claw, 32... Operation tool, S...
…Safety clutch, T…Fixed position stop clutch, X
...Regulation mechanism, Y...Release mechanism.

Claims (1)

[Scope of utility model registration request] A safety clutch S that detachably attaches the seedling planting device 9 to the traveling vehicle body 3 and automatically cuts off power transmission to the seedling planting device 9 when the load on the seedling planting device 9 exceeds a certain level; Device 9
In a riding type rice transplanter in which a fixed position stop clutch T is provided on the traveling vehicle body 3 side, which is capable of interrupting power transmission to the seedling planting device 9 only when the seedling planting claw 14 is in the fixed position, the safety clutch S is used. A regulation mechanism X that prevents transmission cutoff, and a mechanism Y that releases the transmission cutoff restriction state caused by the fixed position stop clutch T.
A riding-type rice transplanter in which both mechanisms X and Y can be operated simultaneously by a single operating tool 32.