JPS5854906Y2 - Seedling planting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drive structure for a seedling planting device in a rice transplanter.

Generally, the drive structure of the seedling planting device described above transmits the power of the installed engine to the seedling planting device via a gear transmission mechanism, but due to irregularities in the gear transmission, manufacturing errors, and assembly errors, etc. The seedling planting arm of the seedling planting device operates in advance due to inertia, its own weight, etc., hindering smooth movement, and as a result, the seedling retrieval posture and seedling planting posture may change, leading to work errors. Ta.

Therefore, as a solution to the above-mentioned drawbacks,
A technique described in Japanese Patent No. 112616 is disclosed.

This structure eliminates the above drawback by providing rotational resistance to the crankshaft to the planting arm, but with this structure, the transmission system up to the crankshaft is Even if rattling could be prevented, it was not possible to absorb rattling at the joint between the planting arm and the crank arm or at the joint between the planting arm and the swinging arm.

The present invention aims to eliminate the above-mentioned drawbacks, and at the same time, it is an object of the present invention to provide as much braking action as possible over a long period of time.

The characteristic structure of the seedling planting device of the present invention is that one end of the planting arm is pivoted to the tip of a swinging arm that is pivotally connected to the planting mission case, and the middle part is attached from the planting mission case. A seedling planting device configured to pivotally connect to a crank arm provided on a protruding crankshaft to drive the planting arm in circular swinging motion, the swinging arm and the planting arm being pivotally connected to each other. A rotational resistance imparting mechanism is interposed in the connecting portion, and this rotational resistance imparting mechanism is housed in a closed space formed at the end of one arm, and this configuration provides the following effects.

In other words, at the connection point between the planting arm and the crank arm, there is a gap due to the fitting of the shaft and the hole, and this gap is forcibly driven by the crank arm, so the rotation of the crank arm A gap is formed on the rear side, and as the crank arm rotates 360 degrees, the gap also rotates 360 degrees.

On the other hand, there is also a gap at the connection point between the planting arm and the swinging arm due to the fitting of the shaft and the hole, and this gap is filled by the swinging arm being pulled by the planting arm while the planting arm is lowering. This creates a gap on the front side in the direction of movement of the swing arm, and while the planting arm is rising, the swing arm is pushed by the planting arm.
As expected, a gap is created on the front side in the direction of movement of the swinging arm, but this gap causes backlash because it is reversed 180 degrees with respect to the planting arm at the turning point where the swinging arm moves from the front to the rear. do.

In order to suppress such rattling, the gap at the connection point between the planting arm and the crank arm is gradually displaced by the rotation of the crank arm, so it is important to consider that when planting, Since a rotational resistance imparting mechanism is provided at the connection point between the arm and the swinging arm, it is possible to suppress large wobbling at the turning point of the swinging arm. In contrast, since it swings back and forth within 180 degrees, the amount of movement relative to the rotational resistance applying mechanism is small, and wear on the rotational resistance applying mechanism is suppressed, allowing the rotational resistance applying mechanism to be used for a long period of time. .

Furthermore, since the rotational resistance imparting mechanism is housed in a sealed space formed at the end of the arm, it will not be exposed to mud, water, etc. in the paddy fields, causing material deterioration and reducing frictional resistance. The braking action as a rotational resistance imparting mechanism is less likely to deteriorate, and good functionality can be maintained over a long period of time.

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

Fig. 1 shows the side view of the seedling planting device, in which a group of seedlings placed on a seedling platform 1 that moves horizontally is picked up by a planting claw 2 attached to a planting arm 7 that oscillates up and down. The structure is such that seedlings equivalent to one plant are scraped off and planted on the mud surface.

One end of the planting arm 7 is pivotally supported at the tip of a swinging arm 4 which is pivotally attached to the planting mission case 3, and is connected to a crankshaft 5 which projects from the mission case 3.
The middle part of the planting arm 7 is pivotally connected to a crank arm 6 provided in the planter.

A rotational resistance imparting mechanism 9 is provided at the pivot connection portion 8 between the swinging arm 4 and the planting arm 7 to prevent the planting arm 7 from operating in advance due to backlash in the drive system. It is an intervention.

As shown in FIG. 2, the rotational resistance imparting mechanism 9 includes a side surface 11 a of a flange 11 formed on a pivot pin 10 inserted and fixed to the planting arm 7 and an inside of the boss portion 12 of the swinging arm 4. A spring member 13 and a rotary friction member 14 as shown in FIGS. 4 and 5 are interposed between the formed step portion 12a and the friction member 14 and the flange side surface 11a. Due to the sliding resistance between the arms 4 and 7
This provides resistance to the relative rotation of the

Further, a sealing material 15 is interposed between the end of the boss portion 12 and the pivot pin 10 to form a sealed space A, and the rotational resistance imparting mechanism 9 is installed inside the space A. .

According to the above configuration, if there is any play in the rotational drive system of the crankshaft 5, the planting arm 7 will perform advance operation due to inertia and its own weight in the downward stroke from the seedling take-out position to the seedling planting position. This is what I am trying to do, but the planting arm 7
The rotational resistance imparting mechanism 9 interposed in the pivot connection portion 8 of the swinging arm 4 prevents the planting arm 7 from advancing in advance, allowing the predetermined operation to be performed without wobbling.

[Brief explanation of drawings]

The drawings show an embodiment of the seedling planting device according to the present invention, and FIG. 1 is a side view showing the planting part, FIG. 2 is a cross-sectional plan view of the main part, and FIG.
The figures are a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a perspective view showing a spring member, and FIG. 5 is a perspective view showing a rotating friction member. 3... Planting mission, 4... Rocking arm, 5... Crank shaft, 6... Crank arm, 7... Planting Attached arm, 8...
・Pivotal connection part, 9...Rotation resistance imparting mechanism, A・
...closed space.

Claims (1)

[Scope of utility model registration request] One end of the planting arm 7 is pivoted to the tip of a swinging arm 4 pivotally attached to the planting mission case 3, and the intermediate portion is provided on a crankshaft 5 protruding from the planting mission case 3. This seedling planting device is configured to be pivotally connected to a crank arm 6 to drive the planting arm 7 in a circular swing manner, and the seedling planting device is configured to rotate at a pivot connecting portion 8 between the swinging arm 4 and the planting arm 7. A seedling planting device characterized in that a resistance imparting mechanism 9 is interposed and the rotational resistance imparting mechanism 9 is housed inside a closed space A formed at the end of one arm 4.