JP2006129748A - Seedling transplanting mechanism in rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seedling transplanting mechanism solving conventional problem in dividing a seedling mat on a seedling tray into a seedling and transplanting the seedling to a surface of a paddy field. <P>SOLUTION: The seedling transplanting mechanism reduces noise and oscillation generated in swing turning of a push out lever 28, and also reduces weight. Wherein the seedling transplanting case 18 in the seedling transplanting mechanism is provided with a soft elastic body 32 such as a rubber, a push out lever 28 which abuts on the soft elastic body on the dead end of the downward turning, and a spring means 29 disposed on an upper face of the lever on the opposite side to the side abutting on the elastic body. A push out shaft 25 which has a seedling pushing out piece 26 on the tip is pivoted as slidable on the axis direction on the seedling transplanting case 18 which has a dividing claw 20 and vertically reciprocates between a seedling tray 10 and the surface of the paddy field 11, and the push out lever 28 connected to the push out shaft is provided in the seedling transplanting case to upward turn against the spring means 29 in the time point of passing through the bottom dead center of the downward stroke and changed to upward stroke in the reciprocating motion of the seedling case in association with the push out lever, and downward moves by a spring force of the spring means on the vicinity of the bottom dead center in the downward stroke of the reciprocating movement. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seedling planting mechanism for splitting seedlings one by one from a seedling mat on a seedling platform in a rice transplanter and planting the seedlings on a field scene.

  In general, this kind of seedling planting mechanism is provided with a split claw projecting in the direction of the seedling stand at the tip of the seedling planting case that reciprocates vertically with respect to the field scene. In the middle of the downward movement toward the center, the tip of the split claw passes through the seedling stage, so that a single seedling is split from the seedling mat on the seedling stage, and then the tip of the split claw is By entering the field scene, the one seedling is planted in the field scene.

  In a conventional seedling planting mechanism, for example, as described in Patent Document 1 and the like, an extrusion shaft extending in the longitudinal direction of the divided claw is provided on the seedling planting case so as to be slidable in the axial direction thereof. The pushing shaft is provided with an extruding piece for the seedling divided by the split claw at the projecting end of the extruding shaft from the seedling planting case, and connected to the extrusion shaft inside the seedling planting case. The push lever is turned upward against the spring means at the time when the bottom lever is moved from the bottom dead center of the downward stroke to the upward stroke in conjunction with the reciprocating motion of the seedling planting case. In the lower stroke of the lower stroke, the spring means is provided so as to be turned downward by the spring force, so that the push-out shaft is moved to the split claw by the upward turn of the push-out lever. Kicking and retraction toward the root portion from the tip portion, the extrusion axis at a downward rotation of the push-out lever is a configuration that connects to advance movement toward the tip end portion of the split nail.

According to this configuration, when the tip of the split claw in the seedling planting case splits a single seedling from the seedling stage during the descending process, and enters the field scene while holding this single seedling Further, when the pushing lever is turned downward, the pushing shaft is moved forward toward the tip of the split claw by the spring force of the spring means, thereby forcibly pushing out the seedling of the strain. Therefore, the certainty of seedling planting can be improved and the planting posture can be stabilized.
JP 2000-139146 A

  In the conventional seedling planting mechanism, a soft elastic body, such as rubber, attached to the lower surface of the push-out lever at the end of the forward movement toward the tip of the split claw on the push-out shaft, It is configured to set by touching.

  However, the downward rotation of the push lever is performed by the spring force stored in the spring means when the push lever rotates in the upward direction, so that a soft elastic body provided on the lower surface of the push lever is provided. Is strongly struck by the spring force of the spring means against the inner bottom surface of the hollow seedling planting case, and the impact generated by this hammering is directly transmitted to the seedling planting case. However, there has been a problem that a considerable amount of noise and vibration are generated by the hitting.

  In particular, the seedling case is generally made of a light alloy such as an aluminum alloy in order to reduce the weight, but this light alloy such as an aluminum alloy is more heavy than a heavy and rigid carbon steel. Since it is rich in resonance with sound and vibration, the noise and vibration generated by hitting the soft elastic body are further amplified.

  In addition, when the soft elastic body moves together with the pushing lever, lubricant such as lubricating grease filled in the seedling planting case leaks out of the seedling planting case by the movement of the soft elastic body. Not only is the fear large, but the soft elastic body moves in the lubricant, so that the wear of the soft elastic body is large and the stroke of the push lever changes, and the speed of the push lever also changes the soft elastic body. There was also a problem that the planting posture of the seedlings on the field scene deteriorated because the body was slowed by exercising in the lubricant.

  In addition to this, in the conventional seedling planting mechanism, as described in Patent Document 1, the spring means for the push-out lever is placed on the portion directly above the push-out shaft so that the upper surface of the seedling case is placed. While being housed and provided in a spring holder provided on the closing lid, the soft elastic body for restricting the end of downward rotation of the push-out lever is provided at a portion deviated from the spring means.

  With such a configuration, in the state in which the push lever is rotated downward by the spring force of the spring means and the soft elastic body is in contact with the seedling case, the push lever is provided with the spring. A bending moment is generated when the spring force in the means acts on a position deviated from the soft elastic body.

  In other words, the pushing lever must be constructed so that it can withstand the bending moment that is repeatedly applied to the spring means and the soft elastic body without interruption, so that the weight increases. There were also problems such as delays in operation and increased power.

  The present invention has a technical problem to solve these problems.

In order to achieve this technical problem, claim 1 of the present invention provides:
“A seedling planting case is attached to the transmission case, and a split claw provided at the tip of the seedling case is reciprocated up and down between the seedling platform and the field scene. An extrusion shaft extending in the longitudinal direction of the claw is provided so as to be slidably supported in the axial direction thereof, and an extruding piece for the seedling divided by the division claw is provided at a protruding end of the extrusion shaft from the seedling planting case. On the other hand, an extruding lever connected to the extruding shaft inside the seedling case is linked to the reciprocating motion of the seedling case and exceeds the bottom dead center of the downward stroke of the reciprocating motion. It turns upward against the spring means at the time of transition to the ascending stroke, and it turns downward by the spring force at the spring means at the time of approximately the bottom dead center of the downward stroke of the reciprocation. In the seedling planting mechanism provided in
A soft elastic body such as rubber is attached to the seedling planting case, and the lower surface of the push lever is brought into contact with the soft elastic body at the end of its downward rotation, while the soft elastic body of the push lever is contacted with the soft elastic body. The spring means is disposed on the upper surface portion on the opposite side to the contact portion. ".

Further, claim 2 of the present invention is
“In the above-mentioned claim 1, the seedling planting case is arranged such that a portion of the seedling planting case on a proximal end side attached to the transmission case is close to the transmission case, and the split claw of the seedling planting case is And the portion on the distal end side where the push-out shaft is provided is bent so as to be located in a part away from the transmission case, and the spring means is a portion of the seedling planting case on the proximal end side attached to the transmission case In addition, it is housed in a spring holder provided on a lid that covers the upper surface of the seedling planting case. "
It is characterized by that.

  Thus, by attaching a soft elastic body such as rubber to a hollow seedling planting case and contacting the push lever to the soft elastic body, the push lever is in contact with the soft elastic body. Since the impact force is buffered by the soft elastic body and then transmitted to the seedling planting case, noise and vibration generated in the seedling planting case are made of an aluminum alloy that is rich in resonance. Even in cases, it can be greatly reduced.

  In addition, since the soft elastic body does not move together with the pushing lever, not only can the leakage of the lubricant such as the lubricating grease filled in the seedling planting case be reliably reduced, but also the lubricant of the soft elastic body. Since the wear of the push lever is reduced, the change in the stroke of the push lever is reduced, and the movement speed of the push lever is hardly slowed, so that it is possible to reliably reduce the deterioration of the planting posture of the seedling with respect to the field scene. .

  In addition, spring means for urging the push lever downward is provided on the upper surface portion of the push lever opposite to the portion that contacts the soft elastic body. Is reduced or avoided from acting on the push lever as a bending moment on the push-out lever in a state where the spring is rotated downward by the spring force of the spring means and is in contact with the soft elastic body. Therefore, the push lever can be reduced in weight, its operation delay can be prevented, and power loss can be reduced.

  In particular, as described in claim 2, the seedling planting case is a part of the seedling planting case in which the portion on the proximal end side to be attached to the transmission case is close to the rotating case. The tip of the split claw and the push-out shaft are bent so that the tip side portion is located at a part away from the rotating case, while the spring means is attached to the transmission case in the seedling case. And a split claw projecting from the seedling planting case toward the seedling mounting stage, and the seedlings are configured so as to be housed in a spring holder provided on a lid that closes the upper surface of the seedling planting case. The spring holders protruding upward from the planting case can be displaced from each other in the axial direction of the drive shaft so that they do not interfere with each other. Thus, by shortening the radius of the rotating case, it is possible to reduce the size and weight of the seedling planting mechanism.

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

  In the figure, reference numeral 1 denotes an eight-row riding type rice transplanter. The rice transplanter 1 is mounted on a traveling machine body 2 supported by a pair of left and right front wheels 3 and a rear wheel 4 and on the rear part of the traveling machine body 2. A seedling planting device 5 mounted so as to be able to move up and down is provided. The traveling machine body 2 is provided with an engine 6 and a control seat 7.

  The seedling planting device 5 includes a transmission case 8 that transmits power from the engine 6, eight rotary seedling planting mechanisms 9 that are disposed in parallel in the transmission case 8 in the horizontal direction at appropriate intervals, and left and right It is constituted by a seedling table 10 which is inclined backward and downward so as to reciprocate, and a plurality of floats 12 which are arranged so as to slide on the surface of the field scene 11 between the seedling planting mechanisms 9. Yes.

  Each seedling planting mechanism 9 is configured as shown in FIGS.

  That is, a drive shaft 13 that is supported by the transmission case 8 horizontally and horizontally and is driven by the engine 6 is provided, and a portion of the drive shaft 13 that protrudes from the transmission case 8 is seen in a side view. An oval rotary case 14 is detachably fixed, and this rotary case 14 is rotated counterclockwise by the drive shaft 13 as shown 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 non-rotatably locked to the transmission case 8 via a connecting member 35. .

  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 at 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 the tip of each seedling planting case 18 in a posture position toward the seedling mounting table 10, while the operation The tip of the 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, and on the upper surface of the seedling planting case 18, A lid body 33 is attached for sealing.

  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 form a gear train mechanism, and each planting shaft 17 is rotated once in the clockwise direction by the gear train mechanism during one counterclockwise rotation in the rotating case 14. Thus, each seedling planting case 18 is configured to reciprocate between the seedling mounting table 10 and the field scene 11 in a state in which the divided claws 20 maintain 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.

  Each seedling planting case 18 is provided with an extrusion shaft 25 extending in parallel with the longitudinal direction of the divided claw 20 so as to be slidable in the axial direction, and an extrusion piece 26 having a U-shaped cross section is formed at the lower end thereof. The upper end of the push-out shaft 25 protrudes into the seedling case 18, and the upper end of the push-out shaft 25 extends vertically into the seedling case 18. The distal end of the pushing lever 28 pivotally attached to the pin 27 so as to pivot and move forward is moved forward in the direction in which the pushing shaft 25 moves toward the tip of the split claw 20 by the downward turning of the pushing lever 28. The push-out shaft 25 is connected via a connecting piece 34 so that the push-out shaft 25 moves backward from the tip end of the split claw 20 toward the root by turning upward in the push-out lever 28.

  Further, in the seedling planting case 18, spring means 29 for urging the pushing lever 28 downward is housed and provided in a spring holder 33a provided so as to protrude upward from the lid 33. On the other hand, the base end of the push lever 28 is brought into contact with the outer peripheral surface of the push cam 21 so that the split claws 20 of the seedling cases 18 are linked with the rotation of the rotary case 14. When the tip of the rotary case 14 comes to the vicinity of the bottom dead center at the lower limit of the reciprocation as the rotary case 14 rotates, the push lever 28 rotates downward by the pressing force of the spring means 29, and each seedling When the planting case 18 moves upward from the bottom dead center of the reciprocating motion as the rotary case 14 rotates, the pusher lever 28 rotates upward against the spring means 29. It is configured to so that.

  In this case, the seedling planting case 18 has a base end side portion attached to the planting shaft 17 in the seedling planting case 18 located at a portion close to the rotating case 14. The seedling planting case 18 has a shape bent in an outward crank shape in a plan view so that the tip side portion where the split claws 20 and the push-out shaft 25 are provided is located at a position away from the rotating case 14. In accordance with the crank shape as described above, the push lever 28 mounted therein is also bent outwardly in a plan view.

  The bottom plate 18a 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 detachably attached to the boss portion 31. The push-out lever 28 is in contact with the upper surface of the soft elastic body 32 at the end of its downward rotation.

  In this case, the push-out lever 28 is bent in a crank shape in a plan view in the same manner as the seedling planting case 18 is bent in a crank shape in a plan view as described above. Of the two corner portions bent in a crank shape, the first corner portion 28a located on the proximal end side of the take-out lever 28 is configured to contact the soft elastic body 32, and The spring means 29 for pressing and pushing the push lever 28 downward and the spring holder 33a for housing the spring means 29 are arranged at a position almost directly above the first corner portion 28a. ing.

  Further, as shown in FIGS. 4 and 6, the boss portion 31 loaded with the soft elastic body 32 is directly and integrally connected to one side plate 18b in the seedling planting case 18, and the other side plate 18c. Are connected together via a rib 36.

  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 the rotation angle of the revolution. Since each seedling planting case 18 rotates, each of the seedling planting cases 18 performs a swinging motion so that the divided claws 20 reciprocate in the vertical direction in a state of facing the seedling mounting table 10. When descending from top to bottom on the side facing the top surface of the base 10, after dividing the seedling from the seedling mat 30 on the seedling mounting base 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. One seedling at the tip of the split claw 20 is planted in the field scene 11 so as to be pushed out.

  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 rotates 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 pushing lever 28 in the seedling planting case 18 contacts the soft elastic body 32 at the end of the downward rotation, thereby restricting the end of the pushing piece 26 in the forward movement.

  In this case, if the soft elastic body 32 is provided on the pushing lever 28 side as in the prior art, the soft elastic body 32 will move against the inner bottom surface of the seedling planting case 18 with the spring means. Since it is struck by the spring force of 29 and the impact generated by this smashing is directly transmitted to the seedling planting case 18, considerably large noises and vibrations are generated.

  On the other hand, in the present invention, as described above, the soft elastic body 32 is provided on the seedling planting case 18 side, so that the push-out lever 28 comes into contact with the soft elastic body 32. Since the impact force is buffered by the soft elastic body 32 and then transmitted to the seedling planting case 18, noise and vibration generated in the seedling planting case 18 are rich in resonance in the seedling planting case 18. Even when it is made of a light alloy such as an aluminum alloy, it can be significantly reduced.

  The push lever 28 is bent in a crank shape in plan view, and comes into contact with the soft elastic body 32 by contacting the soft elastic body 32 at the bent corner portion 18a. The area of the elastic elastic body 32 is larger than that when the pushing lever 28 is straight in a plan view, and the surface pressure when the pushing lever 28 contacts the soft elastic body 32 becomes small. Can be improved.

  Then, the spring means 29 that presses and biases the push lever 28 downward is a portion of the push lever 28 that contacts the soft elastic body 32, that is, the bending of the push lever 28. Since the push lever 28 is in contact with the soft elastic body 32, the spring force in the spring means 29 is bent on the push lever 28 when the push lever 28 is in contact with the soft elastic body 32. Acting as a moment can be reduced or avoided.

  The soft elastic body 32 can be stably supported by being fitted in a boss 31 provided integrally with the bottom plate 18a of the seedling planting case 18, while the soft elastic body 32 can be stably supported. Since the bottom plate 18a of the seedling planting case 18 can be reinforced by the boss portion 31 provided integrally therewith, the push lever 28 contacts the soft elastic body 32. Noise and vibration can be further reduced.

  Moreover, the boss portion 31 is directly integrated with one side plate 18b of the seedling planting case 18, or is integrated with the other side plate 18c via a rib 36, or one side plate 18b. Since the bottom plate 18a can be more strongly reinforced by being integrated directly with the other side plate 18c via the rib 36, the above-described effects can be promoted.

  Furthermore, the pin 27 for pivotally attaching the push lever 28 to the seedling case 18 is in the form of a bolt with a head having a hexagonal hole, as shown in FIG. A sealing ring 27 ′ is fitted to the base, inserted through one side plate 18 b in the seedling planting case 18, and then screwed into a female screw hole in the other side plate 18 c. Yes.

  In addition, the split claws 20 projecting from the seedling planting case 18 toward the seedling mounting table 16 and the spring holder 33a projecting upward from the seedling planting case 18 are shifted from each other in the axial direction of the drive shaft 13. Therefore, they can be prevented from interfering with each other.

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. FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rice transplanter 2 Traveling machine body 3, 4 Wheel 5 Seedling device 8 Transmission case 9 Seedling planting mechanism 10 Seedling stand 11 Field scene 12 Float 13 Drive shaft 14 Rotating case 18 Seedling case 20 Dividing claw 21 Pushing cam 25 Pushing Axis 26 Pushing piece 28 Pushing lever 28a Corner portion 29 Spring means 32 Soft elastic body 33 Lid body 33a Spring holder

Claims (2)

A seedling planting case is attached to the transmission case, and a split claw provided at the tip of the seedling case is reciprocated up and down between the seedling platform and the field scene. An extruding shaft extending in the longitudinal direction is slidably supported in the axial direction of the extruding shaft, and an extruding piece for the seedling divided by the dividing claw is provided at the protruding end of the extruding shaft from the seedling planting case. On the other hand, an extrusion lever connected to the extrusion shaft is raised inside the seedling planting case, and is moved over the bottom dead center of the downward stroke of the reciprocating motion in conjunction with the reciprocating motion of the seedling planting case. It turns upward against the spring means at the time of transition to the stroke, and turns downward by the spring force at the spring means at the time of approximately the bottom dead center of the downward stroke of the reciprocation. In the established seedling planting mechanism,
A soft elastic body such as rubber is attached to the seedling planting case, and the lower surface of the push lever is brought into contact with the soft elastic body at the end of its downward rotation, while the soft elastic body of the push lever is contacted with the soft elastic body. A seedling planting mechanism in a rice transplanter, wherein the spring means is disposed on an upper surface portion on the opposite side to a portion to be in contact with.   The seedling planting case according to claim 1, wherein the part of the seedling planting case where the proximal end side of the seedling planting case is attached to the transmission case is close to the transmission case, and the split claws and While the distal end portion for providing the push-out shaft is bent so as to be located at portions away from the transmission case, the spring means is attached to the proximal end portion of the seedling case to the transmission case. A seedling planting mechanism in a rice transplanter, wherein the seedling planting mechanism is housed in a spring holder provided on a lid that closes the upper surface of the seedling planting case.

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