JP4510592B2 - Seedling planting mechanism in rice transplanter - Google Patents

Description

  The present invention relates to a rotary seedling planting mechanism in a rice transplanter, in which at least two seedling plants are provided in one rotating case.

  Conventionally, this type of rotary seedling planting mechanism is, for example, as described in Patent Document 1 and the like, in which a rotating case is fixed to a drive shaft that is supported horizontally on a transmission case in a rice transplanter. In two equally divided places on the circumference centering on the drive shaft, the drive shaft is supported in parallel with the drive shaft, and a seedling planting case with split claws is attached to each planting shaft, An interlocking mechanism is provided between the drive shaft and the planting shafts in the rotating case so as to rotate the planting shafts in the opposite direction during one rotation of the rotating case. The case is configured such that the tip of the split claw in each of the rice transplanter in the rice transplanter reciprocates while drawing a vertical closed loop motion trajectory.

  Further, in this conventional rotary seedling planting mechanism, each seedling planting case is provided with an extruding tool that reciprocates along the split claws, and this pushing tool is interlocked with the reciprocating motion of the seedling planting case. , Of the reciprocating movement, it moves backward from the tip of the split claw against the spring means at the time of transition from the bottom dead center of the downward stroke to the upward stroke, and at the time of the bottom dead center of the downward stroke of the reciprocating movement, It is configured to move forward toward the tip of the split claw by the spring force of the spring means.

According to this configuration, when the tip of the split claw in the seedling planting case splits one seedling from the seedling stage in the descending process, and enters the field scene while holding this one seedling In addition, since the pushing tool moves forward toward the tip of the split claw by the spring force of the spring means, the one seedling is forcedly pushed out. Can be improved and the planting posture can be stabilized.
JP 2000-139146 A

  However, in the conventional rotary seedling planting mechanism, when the split claw moves up from the bottom dead center where the split claw enters the farm scene most deeply during one rotation of the rotary case, When the spring means is moved backward against the spring means, that is, the elastic force is stored in the spring means, and when it moves downward toward the bottom dead center, the tip of the split claw is moved by the elastic force stored in the spring means. However, there is a problem as described below.

  That is, at a time after the bottom dead center of the reciprocating movement in one rotation of the rotating case, the torque for moving the pusher backward against the spring means prevents the rotating case from rotating. In other words, in the rotational drive of the rotating case, the torque for moving the pusher backward against the spring means acts as a negative torque that prevents the rotating case from rotating. The rotation speed during one rotation of the rotating case fluctuates so that it becomes delayed after the bottom dead center of the reciprocating motion.

  Such a change in the rotation speed during one rotation of the rotating case has a problem that it causes not only a change in the planting posture of the seedling with respect to the field scene but also a kicking of the seedling planted in the field scene.

  In particular, when the split claw in each seedling plant in one rotation of the rotating case splits the seedling from the seedling mount, the torque required for the seedling splitting acts as a resistance that prevents the rotation of the rotating case, and this seedling The torque required for the splitting acts at the time when the top dead center just opposite the bottom dead center of the reciprocating motion has passed, in other words, the torque required for the seedling splitting is the rotational drive of the rotating case, Following the negative torque required for the pusher to move backward against its spring means, it acts as a negative torque that prevents the rotation of the rotating case. It was expanded further.

  The present invention has a technical problem to reduce this problem, that is, to reduce fluctuations in rotational speed during one rotation of the rotating case.

In order to achieve this technical problem, claim 1 of the present invention provides:
“A rotary case is fixed to a drive shaft that is horizontally supported by a transmission case in a rice transplanter, and is divided into planting shafts that are pivotally supported at least in two places on the circumference around the drive shaft in this rotary case. A seedling planting case equipped with claws is mounted, and each seedling planting case is reciprocated up and down with the rotation of the rotating case so that the split claws in the seedling planting case face the direction of the seedling platform in the rice transplanter. Further, each of the seedling planting cases is provided with an extruding tool that reciprocates along the split claws, and the extruding tool is linked to the reciprocating motion of the seedling planting case, Of these, when moving from the bottom dead center of the downward stroke to the upward stroke, it moves backward from the tip of the split claw against the spring means provided in the seedling planting case, and the time of the bottom dead center of the downward stroke of the reciprocating motion And the spring means In planting mechanism consisting configured to forward movement towards the end,
A cam provided to rotate together with or in conjunction with the drive shaft and two elastic bodies provided so as not to rotate. The cam is provided with two protuberances, and both the protuberances are provided. One raised portion of the two parts is moved to the bottom dead center of the downward stroke or the vicinity thereof in the reciprocating motion in each of the seedling planting cases with respect to one of the two elastic bodies. While contacting the elastic body so as to be elastically deformed against its elastic force, the other raised portion of the raised portions is connected to the other elastic body of the two elastic bodies. In the reciprocating motion in the planting case, the other elastic body is contacted so as to be elastically deformed against the elastic force at the top dead center of the rising stroke or in the vicinity thereof. "
It is characterized by that.

Furthermore, claim 2 of the present invention provides
“In the description of claim 2, the two raised portions are provided with a 180 ° angle shift on the outer peripheral surface of the cam, while the two elastic bodies are leaf springs. The cam was arranged so as to be sandwiched from both the right and left sides in the direction perpendicular to the rotation axis. "
It is characterized by that.

With the configuration described in the first aspect, the cam is advanced at a time when the cam that rotates in conjunction with the rotating case shifts from the bottom dead center to the rising stroke in the reciprocating motion in the seedling planting case. By applying a positive torque that rotates, a negative torque required to move the pusher in the seedling planting case against the elastic body by an amount corresponding to the positive torque, and a seedling The negative torque required for the split claw in the planting case to be split from the seedling stage to the seedling can be reliably reduced, so that the rotation of the rotating case is the upward stroke from the bottom dead center of the reciprocating motion in the seedling planting case. Since it is possible to reliably reduce the delay in the timing of shifting to, the rotation of the rotating case can be greatly stabilized.

In particular, with the structure described in the claim 1, the positive torque that rotates the cam advances, since it can be imparted by two ridges and two elastic bodies, it can facilitate the above-mentioned effect.

Moreover, according to the structure described in Claim 2, there exists an advantage which can reduce in size and weight the mechanism for providing the positive torque which advances the said cam and rotates.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, drawings when embodiments of the present invention are applied to a riding type multi-row planting rice transplanter will be described.

  In the figure, reference numeral 1 denotes an 8-row riding type rice transplanter. The rice transplanter 1 has a traveling machine body 2 supported by a pair of left and right front wheels 3 and a rear wheel 4, and a rear part of the traveling machine body 2. The traveling machine body 2 is provided with an engine 6 and a steering seat 7.

  The seedling planting device 5 includes a transmission case 8 to which power is transmitted from the engine 6, eight rotary seedling planting mechanisms 9 disposed in parallel in the transmission case 8 at appropriate intervals in the lateral direction, It is comprised by the seedling mounting base 10 arrange | positioned back and downward inclined so that it may reciprocate, and the several float 12 arrange | positioned so that the surface of the field scene 11 might be slid between each said seedling planting mechanisms 9. Yes.

  Each of the seedling planting mechanisms 9 is configured as shown in FIGS.

  That is, a drive shaft 13 that is supported by the transmission case 8 in a horizontal and horizontal direction and is driven by the engine 6 is provided. A portion of the drive shaft 13 that protrudes from the transmission case 8 has a side view. An oval rotating case 14 is detachably fixed, and the rotating case 14 is rotated counterclockwise by the drive shaft 13 as indicated by an arrow A in a side view of the rice transplanter 1. A sun gear 15 is rotatably fitted on the drive shaft 13 in the case 14, and the sun gear 15 is locked to the transmission case 8 through a connecting member 35 so as not to rotate. .

  An operation shaft 16 for a pusher, which will be described later, is pivotally supported in parallel with the drive shaft 13 at a position where the distance from the drive shaft 13 is equal to the outer peripheral portion of the rotating case 14, that is, both left and right end portions. A hollow planting shaft 17 is rotatably fitted on both operating shafts 16 in the rotating case 14.

  The end portions of the planting shaft 17 and the operating shaft 16 project outward from the side surface of the rotating case 14, and the projecting ends of the planting shafts 17 are opened to the upper surface with a light alloy such as an aluminum alloy. A hollow seedling planting case 18 is attached with a bolt 19, and a split claw 20 is fixed to a boss portion 18 a at the tip of each seedling planting case 18 in a posture position toward the seedling mounting table 10. On the other hand, the tip of the operating shaft 16 protrudes into the hollow portion of the seedling planting case 18, and a cam 21 for pushing operation is fixed to this portion. A lid 33 for sealing the inside of the planting case 18 is attached.

  A planetary gear 22 having the same number of teeth as the sun gear 15 is fitted on each planting shaft 17, while the sun gear 15 and the planetary gear 22 are connected to the rotating case 14. An intermediate gear 23 that meshes at the same time is provided to constitute a gear train mechanism, and the planting shaft 17 is rotated once in the clockwise direction by the gear train mechanism during one counterclockwise rotation in the rotating case 14. By doing so, each seedling planting case 18 is configured to reciprocate between the seedling mounting table 10 and the field scene 11 in a state where the divided claws 20 hold the posture toward the seedling mounting table 10. ing.

  In this case, the sun gear 15, the planetary gear 22 and the intermediate gear 23 constituting the gear mechanism are offset as described in, for example, Japanese Patent Publication Nos. 63-20486 and 63-74413. By constructing a non-circular gear such as a core gear, the tip of the split claw 20 in each seedling planting case 18 draws an elliptical closed-loop motion locus 24 that is long in the vertical direction as shown in FIG. It is composed.

  The boss portion 18a in each seedling planting case 18 is provided with an extrusion shaft 25 constituting an extrusion tool so as to slidably penetrate in an axial direction extending in parallel with the longitudinal direction of the divided claw 20, and its lower end. An extrusion piece 26 having a U-shaped cross section is fixed so as to be close to the rear surface of the split claw 20, and the upper end of the extrusion shaft 25 projects into the seedling planting case 18. At the upper end, the tip of an extrusion lever 28 pivotally attached by a pin 27 so as to pivot in the vertical direction in the seedling planting case 18, and the extrusion shaft 25 is moved downward by the extrusion lever 28. It moves forward in the direction toward the tip of the split claw 20, and the push-out shaft 25 moves backward from the tip of the split claw 20 toward the root by the upward rotation of the push-out lever 28. As it is coupled via a coupling piece 34.

  In the seedling planting case 18, spring means 29 for biasing the push lever 28 in the downward direction is provided between the push lever 28 and the lid 33. By contacting the base end with the outer peripheral surface of the push-out actuating cam 21, the tip of the split claw 20 in each seedling planting case 18 is rotated by the rotation of the rotating case 14 in conjunction with the rotation of the rotating case 14. Accordingly, when the reciprocating motion comes close to the bottom dead center at the lowering lower limit, the pushing lever 28 is rotated downward by the pressing force of the spring means 29, and each seedling case 18 is attached to the rotating case 14. The push-out lever 28 is configured to rotate upward against the spring means 29 when it moves upward from the bottom dead center in the reciprocating motion as it rotates.

  Furthermore, the bottom plate 18b of the seedling planting case 18 is integrally provided with a boss portion 31 protruding into the seedling planting case 18, and a soft elastic body 32 such as rubber can be attached to and detached from the boss portion 31. And the pushing lever 28 contacts the upper surface of the soft elastic body 32 at the end of the downward rotation.

  A cam 36 is fitted in a portion of the drive shaft 13 in the transmission case 8, while two leaf springs 37 and 38 as elastic bodies are provided in the transmission case 8. 6 and 7, the cam 36 is disposed so as to be sandwiched from both right and left sides in the direction perpendicular to the rotation axis thereof, and both ends of the leaf springs 37, 38 are connected to the transmission case 8. The springs 37 and 38 are engaged so as to be elastically deformed outwardly against the elasticity.

  On the other hand, on the outer peripheral surface of the cam 36, two raised portions 39, 40 are provided by shifting the angle by 180 °, and one of the raised portions 39, 40 is connected to the two plates. Of the springs 37, 38, one leaf spring 37 is elastically applied to the leaf spring 37 at the bottom dead center of the descending stroke or in the vicinity thereof in the reciprocating motion in each seedling planting case 18. On the other hand, the other protruding portion 40 of the two protruding portions 39, 40 is connected to the other leaf spring 38 of the two leaf springs 37, 38 while being in contact with each other so as to be elastically deformed outward. In the reciprocating motion in each seedling planting case 18, the other leaf spring 38 is contacted so as to be elastically deformed outward against the elastic force at the top dead center of the rising stroke or in the vicinity thereof. .

  In this configuration, as the rotation case 14 revolves in the arrow A direction, the seedling planting case 18 is centered on the planting shaft 17 in the direction opposite to the arrow A direction by the same rotation angle as that of the revolution. Since each seedling planting case 18 rotates, each of the seedling planting cases 18 swivels so that the split claw 20 reciprocates in the up-down direction in a state of facing the seedling placing table 10. When descending from top to bottom on the side facing the upper surface of the table 10, after dividing one seedling from the seedling mat 30 on the seedling mounting table 10 with the split claws 20 at the tip, The tip of the split claw 20 enters the farm scene 11 in the vicinity of the bottom dead center of the lower limit of the descent.

  At this time, since the pushing lever 28 in the seedling planting case 18 is rotated downward by the spring force of the spring means 29, the pushing piece 26 moves forward toward the tip of the split claw 20. A single seedling at the tip of the split claw 20 is pushed out and planted in the field scene 11, while both leaf springs 39, 40 are formed on both raised portions 39, 40 of the cam 36 as shown in FIG. 6. Thus, the elastic force is stored in the leaf springs 39 and 40 by being elastically deformed outward.

  When planting of the seedling is finished, the split claw 20 moves upward from the farm scene 11. Simultaneously with this upward movement, the push-out lever 28 pivots upward against the spring means 29, so that the push-out piece 26 moves backward from the tip of the split claw 20 toward the root portion. The cam 36 acts so that the elastic force stored in the plate springs 37 and 38 advances and rotates the cam 36 via the raised portions 39 and 40.

  In this way, the cam 36 is rotated and advanced at the time when the cam 36 that rotates in conjunction with the rotating case 14 moves from the bottom dead center to the rising stroke in the reciprocating motion in the seedling planting case 18. By applying a positive torque, a negative torque required to move the pushing shaft 25 in the seedling planting case 18 back against the spring means 29 by the amount of the positive torque, and a seedling planting case. The negative torque required for the split claw 20 at 18 to split the seedling mounting base 10 into seedlings can be reliably reduced.

  And when the said seedling planting case 18 is located between the said bottom dead center and the said top dead center, both the protruding parts 39 and 40 in the said cam 36 are shown in FIG. 38, the two leaf springs 37 and 38 are not elastically deformed.

  In the above-described embodiment, the cam 36 is provided on the drive shaft 13 to which the rotating case 14 is fixed. However, the present invention is not limited to this, and the cam 36 may be combined with the rotating case 14 or the same. Needless to say, it may be configured to be provided on a shaft that rotates in conjunction with, for example, a power transmission shaft to the drive shaft 13.

It is a side view of a riding type rice transplanter. It is a top view of a riding type rice transplanter. It is an enlarged side view of the seedling planting mechanism in FIG. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 3. FIG. 5 is an enlarged sectional view taken along line VV in FIG. 4. It is a figure which shows the state which exists in a bottom dead center in the VI-VI cross-sectional view of FIG. It is a figure which shows the state which exists in a top dead center in the VI-VI sectional view of FIG.

1 Rice transplanter 2 Traveling machine 3, 4 Wheel
DESCRIPTION OF SYMBOLS 5 Seedling planting device 8 Transmission case 9 Seedling planting mechanism 10 Seedling stand 11 Farm scene 12 Float 13 Drive shaft 14 Rotating case 18 Seedling case 20 Dividing claw 21 Pushing operation cam 25 Pushing shaft 26 Pushing piece 28 Pushing lever 29 Spring means 32 Soft elastic body 36 Cam 37, 38 Leaf spring 39, 40 Raised portion

Claims (2)

A rotary case is fixed to a drive shaft that is horizontally supported by a transmission case in a rice transplanter, and a split claw is attached to a planting shaft that is pivotally supported at least in two places on the circumference around the drive shaft in the rotary case. A seedling planting case equipped with the above is mounted, and by rotating the rotating case, the split claws in the seedling planting case are reciprocated up and down in a posture facing the direction of the seedling mounting platform in the rice transplanter. Further, each of the seedling planting cases is provided with an extruding tool that reciprocates along the split claws, and the extruding tool is linked to the reciprocating motion of the seedling planting case. At the time of transition from the bottom dead center of the downward stroke to the upward stroke, it moves backward from the tip of the split claw against the spring means provided in the seedling planting case, and at the time of the bottom dead center of the downward stroke of the reciprocating motion. The tip of the split claw by the spring means In planting mechanism consisting configured to forward movement towards,
A cam provided to rotate together with or in conjunction with the drive shaft and two elastic bodies provided so as not to rotate . The cam is provided with two protuberances, and both the protuberances are provided. One raised portion of the two parts is moved to the bottom dead center of the downward stroke or the vicinity thereof in the reciprocating motion in each of the seedling planting cases with respect to one of the two elastic bodies. While contacting the elastic body so as to be elastically deformed against its elastic force, the other raised portion of the raised portions is connected to the other elastic body of the two elastic bodies. A seedling in a rice transplanter, wherein the other elastic body is contacted so as to be elastically deformed against the elastic force at a time near or near the top dead center of the ascending stroke of the reciprocating movement in the planting case. Planting mechanism. In the description of claim 1, the two raised portions are provided by shifting the angle of 180 degrees on the outer peripheral surface of the cam, while the two elastic bodies are leaf springs, and both the leaf springs are connected to the cam. A seedling planting mechanism in a rice transplanter, characterized in that it is arranged so as to be sandwiched from both the right and left sides in a direction perpendicular to the rotation axis .

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