JPS5947575B2 - Safety device for seedling planting equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention sequentially removes and plants seedlings one by one from the bacterial group on the seedling stand while performing vertical circulation between the seedling take-out point of the seedling stand and the mud. The present invention relates to a safety device for a seedling planting device that incorporates a safety clutch mechanism that automatically stops driving the planting claw when the driving torque of the planting claw exceeds an allowable setting value.

If a safety clutch mechanism is incorporated, it will be possible to prevent damage to the planting claw even if an overload is applied to the planting claw. Since this was done using only one safety clutch that operated over the entire range of operation, there were the following disadvantages.

In other words, if we compare the loads acting on the planting claws in the upper seedling retrieval range and the lower planting range of the entire range of operation of the planting claws, we find that the lower part of the claws, which may penetrate into the hard mud of the field and plant seedlings, is A larger load acts on the planting area than on the upper seedling extraction area where seedlings are taken out and planted from a bacterial group managed and grown for the seedling planting device.

It is preferable to set the permissible setting value of the claw drive torque in the lower planting range to a large value that can reliably perform planting work even in hard mud. The allowable torque setting value should be set to such a value that the claw drive will immediately stop when a load greater than that applied during normal seedling removal is applied, to avoid applying unnecessary loads to the claws as much as possible. First, it is preferable to prevent the bacterial group from being damaged by forcibly separating the strong intertwining of the bacterial group, which is thought to be the cause of overload.

However, a single safety clutch cannot exert a sufficient effect on the seedling planting range and seedling removal range, making it difficult to plant in hard fields and easily damaging the bacterial group. It had become a thing.

The present invention has been made with the above problems in mind, and
By improving the safety clutch mechanism, it is possible to perform planting work in hard fields, and to avoid damage to seedlings as much as possible when taking out seedlings. In a safety device for a seedling planting device, an input shaft of the seedling planting device includes a rotating body to which an output from a prime mover is manually applied, and a movable clutch piece provided with an articulating protrusion that engages with an articulating protrusion of this rotating body. The rotating body is loosely fitted to the shaft, and the movable clutch piece is fitted to be able to rotate integrally with the shaft, and both are mounted on the shaft so as to be able to slide freely in the axial direction. The occlusal protrusions are elastically biased in the direction in which they interlock with each other, and the elastic pressing force acting on the pupil body is greater than the elastic pressing force acting on the movable clutch piece. In the remaining part of the planting claw excluding the part corresponding to the part in the upper seedling retrieval range outside the lower planting range within the entire operating range of the planting claw, the input side contacts the fixed piece attached to the transmission case. It is characterized by being provided with an abutment piece that prevents movement of the rotor in a direction away from the rotating body.

In other words, if an extra load is applied to the claws when taking out the upper seedlings, the rotating cam body will respond at the part where the cam does not come into contact with the fixed piece, and the elastic pressing force on the rotating body will be applied to the rotating cam body. Because it overcomes the elastic pressing force, the rotating cam body resists the elastic pressing force and separates from the rotating body, causing the occlusion of the occlusal process to be released and the driving force from the rotating body to the human power shaft to be cut off. In this case, the rotary cam body comes into contact with the cam fixing piece and cannot slide if an excessive load is applied to the claws in the lower planting range, while fully exerting the effect of preventing damage to the seedlings. The rotating body resists the elastic pressing force and separates from the rotating cam body, disengaging the occlusal protrusion and cutting off the driving force from the rotating body to the input shaft, so it is reliable even in hard mud. As a result, it has become possible to solve the above-mentioned problems while exhibiting a good safety effect on claw drive.

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

Figure 1 shows the side view of the walking rice transplanter, with the front engine 1
, a main transmission case 2, a longitudinally long frame 3 that also serves as a transmission case, a rear seedling planting device 4, etc., a pair of left and right propulsion wheels 5, 5 that move forward while touching the hard surface, and a field scene. It is configured to advance while being supported by a group of sliding floats 6, and to sequentially plant seedlings in the field using the seedling planting device 4.

The seedling planting device 4 includes an inclined seedling platform 7 that is horizontally reciprocated with a constant stroke, and a planting claw 8 that circulates up and down between the lower end of the seedling platform 7 and the mud.・・・
. . . etc., and the planting claw 8 is configured to sequentially take out one seedling at a time from the bacterial group placed on the seedling stand 7 and plant it. .

In the planting mission case 9 connected to the rear end of the frame 3, as shown in FIGS. 2 to 4, there is an input sprocket 10, which is an example of a rotating body to which the engine output is transmitted by a chain, and a seedling seedling transmission case. A planting clutch 12 is provided to connect and disconnect the input shaft 11 of the attachment device 4.

That is, this planted clutch 12 has an interlocking protrusion 12a formed on the side of the human-powered sprocket 10 rotatably supported by the input shaft 11, and a movable clutch piece 13 formed on the side of the movable clutch piece 13 spline-connected to the input shaft 11. The movable clutch piece 13 is configured to disconnect and disengage power transmission by engaging and disengaging the occlusal protrusion 12b, and the partially arc-shaped contact piece 13a formed integrally with the movable clutch piece 13 comes into contact with the fixed piece 14.
Only when the planting claw 8 is in the upper seedling retrieval range outside the lower planting range within the entire operating range, the movable clutch piece 13
The clutch is configured so that a clutch disengagement operation can be performed by moving the clutch in the separating direction.

In addition, 19 in the figure is a shift fork that is engagedly connected to the outer peripheral portion of the movable clutch piece 13.

Further, by using the components of the planting clutch 12, a safety clutch mechanism described below is configured which automatically stops driving the planting claw 8 when the drive torque of the planting claw 8 becomes less than an allowable set value. .

That is, both the occlusal protrusions 12a and 12b are formed on gently inclined cam surfaces, and the first blade ring 15 that urges the movable clutch piece 13 toward the occlusal side and the input sprocket 10
A second spring blade ring 16 is provided to bias the spring toward the occlusal side, and the first spring 15 is set to have a smaller biasing force than the second spring 16.

Then, in the upper planting range, the first spring 15
The first safety clutch 17 shifts the movable clutch piece 13 to the disengagement side by cam action against the cam action, and the input sprocket 10 is shifted to the disengagement side by cam action against the second blade ring 16 in the lower planting range. A second safety clutch 18 is configured to shift the first safety clutch 18 to
Due to the setting of the biasing force of the second spring 15,16, the allowable set point of the second safety clutch 18 is set to be smaller than the allowable set point of the first safety clutch 17.

Note that the safety clutch mechanism of the embodiment operates not only in response to fluctuations in the drive torque of the seedling platform 7 and other devices, but also in response to fluctuations in the driving torque of the seedling platform 7 and other devices.
Among the various devices described above, the planting claw 8 is the only one that causes a large variation in the drive I/lux, so it is substantially activated only in response to variations in the claw drive I/lux.

Further, as in the embodiment, if the present invention is implemented using the components of the existing planting clutch 12, the desired purpose can be achieved with a low cost and simple structure, which is advantageous. .

[Brief explanation of the drawing]

The drawings show an embodiment of the safety device of the seedling planting device according to the present invention, FIG. 1 is a side view of the walking rice transplanter, FIG. 2 is a cross-sectional plan view showing the attachment part of the planting clutch, and FIG. FIG. 2 is a sectional view taken along line IfJ-III in FIG. 2, and FIG. 4 is a developed view of the occlusal process. 4... Seedling planting device, 7... Seedling stand,
8... Planting claw, 9... Mission case, 1o... Curved rotating body, 11... Input shaft, 12
a, 12b... occlusal projection, 13... movable clutch piece, 13a... contact piece, 14... curved rotation fixed piece, 17... first safety clutch , 18...
...Second safety clutch.

Claims (1)

[Claims] 1. Driving torque of the planting claw 8 which sequentially takes out seedlings one by one from the bacteria group on the seedling platform 7 and plants them while circulating up and down between the seedling take-out point of the seedling platform 7 and the mud. This is a safety device for a seedling planting device that incorporates a safety clutch mechanism that automatically stops driving the planting claw 8 when the amount exceeds an allowable set value, and the input shaft 11 of the seedling planting device 4 is The rotary body 10 is loosely fitted to the input shaft 11, and the movable clutch piece 13 is provided with a rotary body 10 into which the output from the prime mover is input, and a movable clutch piece 13 having an occlusal protrusion 12b that engages with the occlusal protrusion 12a of the rotary body 10. The movable clutch piece 13 is fitted to be rotatable together and is slidable in the axial direction.
3 is configured such that the respective occlusal protrusions 12a and 12b are elastically pressed in the direction in which they are engaged with each other, and the elastic pressing force acting on the rotating body 10 is greater than the elastic pressing force acting on the movable clutch piece 13. At the same time, the movable clutch piece 13 is arranged in the transmission case 9 in the remaining parts excluding the part corresponding to the part in the upper seedling retrieval range outside the lower planting range within the entire operating range of the planting claw 8. A safety device for a seedling planting device, characterized in that a contact piece 13a is provided to prevent the input end from moving away from the rotating body 10 by coming into contact with a fixed piece 14 attached to the rotating body 10.