JPH0817613B2 - Planter drive mechanism in seedling transplanter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a planter drive mechanism in a seedling transplanter for planting scraped seedlings in a field.

[Problems to be Solved by Prior Art and Invention] In general, in this seedling transplanter, a planter is moved in a constant circulation path based on the rotation of a planting axis to scrape and drive seedlings. However, the posture of the planter is changed with respect to the planting axis so that the planter takes a proper seedling scraping posture or planting posture. For this reason, the planter is
The circulation locus is moved in a state in which the deceleration movement process in which the high speed state gradually changes to the low speed state and the speed increase movement process in which the low speed state gradually changes to the high speed state are repeated are repeated.

By the way, the power transmission from the PTO shaft to the planting shaft is
Generally, a cruciform universal joint is performed via a power transmission shaft provided at both ends. Such a universal joint, when the input side shaft rotates at a constant speed,
The shaft on the output side has the property of transmitting power while repeating acceleration / deceleration and a sinusoidal change in angular velocity.

Therefore, conventionally, both universal joints have a 90-degree phase difference as shown in FIG. 6 to cancel the angular velocity change of both universal joints, and the output shaft connected to the planting shaft side is driven at a constant speed. Either the rotary motion is performed, or, as shown in Japanese Utility Model Publication No. 54-20336, the phase difference between the two universal joints is eliminated and the planting shaft is rotated at a large unequal speed. In the latter case, the deceleration position is set so as to pass the seedling scraping point or planting point of the planter.

By the way, in the movement of the circulating locus of the planter described above,
During the deceleration movement process, deceleration (negative acceleration) acts on the planter. As a result, the planter will move ahead of the rotation of the planting shaft due to the inertia so that the planter will move forward, and as a result, the planter will be in a state where backlash such as backlash is absorbed on the leading side. However, when the planter shifts from the deceleration movement process to the acceleration movement process, the planter receives the acceleration acceleration, which means that the backlash absorbed by the leading side is absorbed by the trailing side. It will change.

As a result, as described above, in the case where the planting shaft is rotated at a constant speed, the fluctuation of the backlash is directly reflected in the rotation unevenness and the movement of the planter appears, resulting in lack of smoothness in the movement of the planter. If the planting performance is impaired and the planting shaft is rotated at a non-constant speed and the deceleration position is set to the time when the planter passes the seedling scraping point or planting point, this is further promoted. There is.

[Means for Solving the Problems] The present invention has been devised with the object of providing a planter drive mechanism in a seedling transplanter that can eliminate these drawbacks in view of the above circumstances.
Decelerate the planter, which moves and draws a constant circulation trajectory based on the rotation of the planting axis to scrape the seedling and drive the planting, from the high speed state to the low speed state with the rotation of the pitching axis of the planting shaft at a constant angle. In a seedling transplanter configured to repeat the moving process and the speed increasing moving process that changes from the low speed state to the high speed state again, from the PTO shaft through a power transmission shaft equipped with a universal joint on the planting shaft. In order to drive the planter by transmitting the power of the above, the power transmission shaft shall transmit the non-constant rotational motion in which the speed-up rotation process and the deceleration rotation process are repeated to the planting shaft, and the power transmission shaft and the planter are connected to each other. The timing is set so that the speed-up rotation process of the power transmission shaft corresponds to the deceleration movement process of the planter, and the speed reduction rotation process of the power transmission shaft corresponds to the speed-up movement process of the planter. It is an feature.

According to the present invention, the uneven rotation is eliminated as much as possible, and the planter can move smoothly.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a riding type traveling machine body, and a planting portion 2 is connected to a rear portion of the traveling machine body 1 so as to be vertically movable. 1a is a PTO shaft of the traveling body 1, 2a is an input shaft of the planting section 2, and the PTO shaft 1a and the input shaft 2a are interlocked via a power transmission shaft 3 having universal joints 4 and 5 at both ends. It is connected.

That is, the power transmission shaft 3 is provided with the first universal joint 4 on the traveling machine body 1 side and the second universal joint 5 on the planting portion 2 side at both ends, but both universal joints 4 and 5 are Is set to have a phase difference θ (the phase difference is set to about 30 degrees in the embodiment) in the mounting angle around the axis, and accordingly, as shown by the solid line in FIG. Output shaft of two universal joint 5
5a is configured to perform a non-constant rotational motion having a decelerating rotational process i, iii and a speed-increasing rotational process ii, iv during one rotation, and this non-constant rotational motion is directly transmitted to the input shaft 2a. Is set.

The variably rotating motion of the input shaft 2a is directly applied to the planting shaft 6
The planter 7 is planted and driven by the power transmission to the planter 7, and the planter 7 of the embodiment employs the following high-speed planting type planter. That is, planting axis 6
The gear case 8 is integrally assembled with the gear case 8, and the sun gear 9 is rotatably supported by the planting shaft 6 so as to be freely rotatable in a state of being installed in the gear case 8. An intermediate gear 10 meshes with the sun gear 9, and the intermediate gear 10 has a final gear.
11 mesh. An output shaft 12 is integrally supported by the final gear 11, and the planter 7 is provided on the output shaft 12. Moreover, the gears 9, 10 and 11 are all configured by using eccentric gears, and the rotation of the gear case 8 associated with the rotation of the planting shaft 6 causes an intermediate rotation around the sun gear 9 fixed to the planting frame 2b side. It is set that the gear 10 revolves while revolving, and the final gear 11 revolves in the opposite direction with respect to the intermediate gear 10, revolving in the opposite direction, whereby the output shaft 12 rotates at a non-constant speed. . Due to the rotation of the output shaft 12 and the rotation of the gear case 8, the planter 7
As shown in FIG. 5, while changing its posture with respect to the gear case 8 so as to always face the seedling mounting table 2c, it operates by drawing a circulation locus close to a substantially oval shape that is long in the up-down direction. The planting seedlings are scraped off and the planted seedlings scraped off are planted. With this, the moving speed of the planter 7 changes with respect to the rotation of the planting shaft 6 at a constant angle pitch. The unequal speeds are set so that the top and bottom sides are slow. In other words, when the planter 7 makes one cycle circulation movement, the planter 7 descends halfway while gradually increasing the speed from the low speed state near the top of the upper part. Deceleration movement process II that descends to the vicinity of the lower top, speed-up movement process III that accelerates from the vicinity of the lower top and rises halfway, and finally further accelerates while decelerating from this midway position It is set to change the speed through the deceleration movement process VII to the vicinity of the top.

Incidentally, in the present invention, the non-uniform speed moving processes I to IV of the planter 7 and the non-uniform speed rotating processes i to iv of the planting shaft 6 are set in timing as described below. That is, the decelerating movement processes II and IV of the planter 7 become the accelerating rotation processes ii and iv of the planting shaft 6, and the accelerating movement processes I and III of the planter 7.
However, the timing is set so that the decelerated rotation processes i and iii of the planting shaft 6 substantially correspond to each other.

In an embodiment of the invention constructed as described, PT
The driving force of the O shaft 1a is transmitted to the planting shaft 6 via the power transmission shaft 3, and the seedling planting drive of the planter 7 is performed based on this, but the deceleration movement process II of the planter 7
Timing IV substantially corresponds to the speed increasing rotation processes ii and iv of the planting shaft 6, and speed increasing moving processes I and III substantially correspond to the decelerating rotation processes i and iii of the planting shaft 6, respectively. As a result, planter 7
The deceleration acceleration received when moving the deceleration movement processes II and IV and the acceleration acceleration received when moving the acceleration movement processes I and III are offset by the acceleration rotation and the deceleration rotation on the planting shaft 6 side. Will be done. Therefore, when the planting shaft 6 moves in the decelerating movement processes II and IV, like the conventional planting shaft 6 that makes a constant-velocity rotational motion, the planter 7 precedes the rotation of the planting shaft 6 by inertia and moves toward the top of the locus. When it goes to the speed increasing movement process I and III, it will be delayed to the rotation of the planting shaft 6 and the uneven rotation will be surely suppressed, and the jerky movement of the planter will be avoided. As a result, the locus can move smoothly and contribute to improving the planting performance.

In addition, the present invention is not limited to the above-mentioned embodiment, and the unequal speed rotation of the power transmission shaft corresponds to the phase difference between the universal joints so as to correspond to the acceleration / deceleration state on the planter 7 side. Can be set to an appropriate angle to set the optimum angle. Further, in the above-described embodiment, the gear case provided with two sets of planters has been described, but it is needless to say that the present invention is not limited to this and one set of planters may be provided.

[Advantageous Effects] In short, since the present invention is configured as described above, the planter drives and scrapes while repeating the acceleration / deceleration change to perform the planting operation, but the planter performs the deceleration movement process. When moving, the accelerating rotation process of the planting shaft that rotates unequally corresponds, and when moving the accelerating moving process, the decelerating rotation process of the planting shaft corresponds to the deceleration acceleration and Acceleration acceleration received in the acceleration movement process is offset by acceleration rotation and deceleration rotation on the planting shaft side.
For this reason, when the planting shaft moves from the deceleration movement process to the acceleration movement process as in the case where the conventional planting shaft moves at a constant speed, the inertia received by the planter changes in the opposite direction, which causes uneven rotation. This is surely prevented, and a smooth trajectory movement without a jerky planter movement is achieved, which can contribute to the improvement of planting performance.

[Brief description of drawings]

The drawings show an embodiment of a planter drive mechanism in a seedling transplanting machine according to the present invention. Fig. 1 is an overall side view of the seedling transplanting machine, Fig. 2 is an enlarged sectional side view of a planter part, Fig. 3 is a sectional front view of the same as above, Fig. 4 is an operation explanatory view showing a moving state of the planter, and Figs. 5A and 5B are schematic views of a power transmission shaft and angular velocity change diagrams from which a non-uniform rotational force is taken out. 6 Fig. A, B
FIG. 4A is a schematic view of a power transmission shaft from which a uniform rotational force is extracted and an angular velocity change diagram. In the figure, 1 is a traveling body, 2 is a planting portion, 3 is a power transmission shaft,
4 and 5 are universal joints, 6 is a planting shaft, and 7 is a planter.

Claims (1)

[Claims] 1. A planter, which moves in a constant circulation locus based on the rotation of the planting axis to scrape the seedling and drive the planting, with respect to the rotation of a constant angle pitch of the planting axis,
A seedling transplanter configured to repeat a deceleration moving process changing from a high speed state to a low speed state and a speed increasing moving process changing from the low speed state to a high speed state again, wherein the planting shaft is provided with a universal joint. When the planter is driven by transmitting power from the PTO shaft via the power transmission shaft, the power transmission shaft shall transmit non-constant rotational motion in which the speed increasing rotation process and the speed reducing rotation process are repeated to the planting shaft. And the power transmission shaft and the planter are timed so that the speed-up rotation process of the power transmission shaft corresponds to the deceleration movement process of the planter, and the speed reduction rotation process of the power transmission shaft corresponds to the speed-up movement process of the planter. A planter drive mechanism in a seedling transplanter.