JPS6335539Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lever device for adjusting the planting depth of seedlings by vertically adjusting the set position of a float in a rice transplanter.

In general, a planting depth adjustment lever device is guided by a lever guide having a large number of locking grooves in a direction perpendicular to the direction of rotation of the lever, and is used to directly adjust the float up and down by rotation of the lever. , it is required to be bendable in the horizontal direction and rigid in the vertical direction. For this reason, conventionally, the lever is divided into two parts in the middle, and both lever pieces are pivotally connected via a hinge, and the lever pieces are engaged with the locking groove of the lever guide.
It was constructed using springs to ensure stability. Therefore, the lever device has a large number of parts, and even if the precision of the parts is improved, the lever device inevitably has looseness at the hinge part, which causes variations in the set position of the float, which increases the cost and reduces the planting depth. The adjustment performance was reduced. It is also possible to construct the lever with spring steel or insert a leaf spring between the levers, but these devices require expensive spring steel and are expensive, and spring steel does not have sufficient rigidity. Otherwise, there is a risk that the lever and float may vibrate.

Therefore, in the present invention, the lever is partially compressed into a flat shape in the middle part between the lever guide and the fulcrum so that the direction perpendicular to the direction of rotation of the lever is thinner, and the lever can be rotated. It is an object of the present invention to provide a vertical adjustment device for a float that has high rigidity in the directional direction and moderate elasticity in the lateral direction, thereby eliminating the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the planting device 1 in the riding rice transplanter includes a drive case 3 supported by a link 2 at the rear of the traveling machine so as to be able to rise and fall freely.
have. A seedling stand 5 is supported on the case 3 so as to be slidable in the horizontal direction, and behind it is a planting rod 7 for planting the seedlings on the seedling stand 5 onto the rice field 6 in a predetermined trajectory. It is rotatably supported.
In addition, there are floats 9, 9 on the left and right below the case 3.
However, an auxiliary float 9' is suspended in the center, and the front part of the float 9 is swingably suspended via bendable links 10 and 11 at the middle part. The latter is suspended so that its set position can be adjusted by a planting depth adjusting lever device 12 according to the present invention.

The planting depth adjusting lever device 12 includes a rod-shaped lever 13 made of ordinary steel and a lever guide 15 into which the lever 13 is inserted and which is fixed to the case 3. The lever guide 15 includes a guide groove 15a extending in the rotational direction of the lever 13 and a large number of locking grooves 15b cut out laterally on one side of the guide groove 15a. Also, lever 13
As shown in detail in FIG. 3, the lever guide 15
The intermediate part between the and the fulcrum is partially pressed by a press so that the direction perpendicular to the rotational direction of the lever 13 is thinner, and the flattened part 13a is formed into a flat shape. That is, the lever 1 is thicker in the vertical direction and thinner in the horizontal direction.
3 is constructed to have high rigidity in the rotational direction and moderate elasticity in the lateral direction.
Furthermore, the tip of the lever 13 is bent and welded to a holder 16 having a U-shaped cross section. Holder 1
6 is rotatably supported by the case 3 by a fulcrum bolt 17, and its tip is connected to the rear part of the float 9 by a pin 19.

Since the present embodiment has the above-described configuration, the planting device 1 has the floats 9 and 9' sliding on the rice field 6 while the planting rod 7 scrapes off the seedlings on the seedling stand 5.
Planting is carried out one by one on the rice field 6. At this time, the planting device 1 is controlled up and down by a planting depth control device (not shown) based on the swinging angle of the float 9, and is The planting depth is controlled to maintain a substantially constant planting depth, but the planting depth is controlled by the float 9.
It is determined by the position of the swing fulcrum pin 19 and, therefore, the position of the lever 13 of the planting depth adjustment lever device 12. To adjust the planting depth, hold the upper end of the lever 13 and move it in the direction of the arrow in Figure 2 while bending the lever 13 based on its flat part 13a to remove it from the locking groove 15b. , and further guide groove 1
5a in the direction of the arrow in FIG. Then, when the lever 13 reaches the desired locking groove 15b,
By removing the force acting on the lever 13,
The lever 13 is restored based on the elasticity of the flat portion 13a and engages with a predetermined locking groove 15b. As a result, the holder 16 integrated with the lever 13 rotates around the fulcrum bolt 17, changing the setting position of the pin 19 and adjusting the planting depth. At this time, lever 13
Since the rotation of the lever 13 is transmitted through the thickness direction of the flat portion 13a, the force can be transmitted rigidly without the lever 13 being bent, and the heavy float 9 can be moved. The elasticity based on the thinner direction of the flat portion 13a ensures that the locking groove 15b
is engaged and held.

In addition, although the above-mentioned Example demonstrated the planting device of a riding rice transplanter, it is of course applicable also to a walking rice transplanter.

As explained above, according to the present invention, the intermediate part of the lever 13 is flattened by being crushed so that the thickness is thinner in the direction perpendicular to the direction of rotation of the lever, so that the load from the float 9 acts on the intermediate part of the lever 13. Although it has very high rigidity in the vertical direction and moderate elasticity in the horizontal direction based on only the operating force, and has an ideal function as the planting depth lever device 12, it does not have a hinge part or an expensive It does not require spring steel or the like and can be constructed at low cost, and since it is a one-piece structure, no play occurs, and the set position of the float 9 can be accurately matched to the set position of the lever 13. The depth can be maintained constant. Generally, the planting device 1 has a complicated component structure, and an increase in weight greatly affects performance, so a particularly simple structure is desired. However, the present lever device 12 has a simple lever 13 Therefore, only a small amount of installation space is required, and since it is lightweight, it can be easily attached to the planting device 1, and the balance performance and performance against deep paddy fields of the planting device 1 can be improved.

[Brief explanation of drawings]

Fig. 1 is a side view showing a planting device to which the present invention is applied, Fig. 2 is a partially omitted plan view thereof, and Fig. 3 is a plan view of a portion of the planting depth adjusting lever device. 1... Planting device, 3... Case, 9... Float, 12... Planting depth adjustment lever device, 13...
Lever, 13a... Flat part, 15... Lever guide, 15a... Guide groove, 15b... Locking groove, 1
7...Fulcrum.

Claims (1)

[Scope of utility model registration request] In a planting device having a float suspended in a case so that the front part can swing freely and the rear part can freely adjust the set position by a planting depth adjustment lever device, the planting depth adjustment lever device A rod-shaped lever rotatably supported by the case and interlocked with the float, and a lever guide having a guide groove and a number of locking grooves cut out laterally on one side of the guide groove. Further, the lever is partially crushed into a flat shape at an intermediate portion between the lever guide and the fulcrum so that the lever becomes thinner in a direction perpendicular to the rotational direction of the lever, and the flat part is formed into a flat shape. 1. A vertical adjustment device for a float, characterized in that the lever is bent in a direction to engage and disengage from a locking groove, is biased in a direction to engage in a locking groove, and has high rigidity in the rotating direction of the lever.