JP4577828B2 - Rice transplanter - Google Patents

Description

The present invention, among the rice transplanters, at least the seedling mounting table by the rotation of the rotating case two provided seedlings explants remain attitude of facing forward seedling mounting table direction in one rotating case and the field plane It is related with the rice transplanter which equips with the rotary type seedling planting mechanism comprised so that it could reciprocate up and down between.

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 horizontally supported by a transmission case in a rice transplanter. At least two equally divided seedlings on the circumference around the drive shaft are attached to the rotating case, while each rotating plant is attached to the rotating case during one revolution of the rotating case. An interlocking mechanism that rotates only once in the opposite direction is provided, and each seedling plant is placed between the seedling platform and the field scene in a posture in which the divided claws face the direction of the seedling platform located in front. When reciprocating between them, the interlocking mechanism is configured to delay the rotation speed of each seedling plant in the reverse direction associated with the revolution of the rotating case around the bottom dead center of the seedling plant. By using an interlocking mechanism, The tip of the split nail in seedling explants is constitutes so as to draw a movement trajectory of the long oval shape of the closed loop up and down.

  Moreover, in the case of the rice planting operation by the rice transplanter equipped with the rotary seedling planting mechanism, the sparse planting or the standard planting in which the number of planted stocks per unit area is 50 to 60 or less for the field scene, In some cases, the planting density is increased by increasing the number of planted strains per area.

In this case, the change in the number of planted strains described above is such that the rotational speed in the rotating case is slowed in the case of sparse planting or standard planting relative to the forward traveling speed in the rice transplanter by the inter-strain transmission mechanism. In this case, it is configured to be performed by speeding up.
JP 2000-139146 A

However, the motion trajectory at the tip of the split claw of each seedling plant is set by the inconstant speed interlocking mechanism in the rotating case, so that the motion trajectory by the inconstant speed interlocking mechanism in this rotating case is In accordance with the sparse planting or standard planting with the rotational speed being relatively slow relative to the forward traveling speed of the rice transplanter, it is optimal for this sparse planting or standard planting, that is, the divided claws are If the speed at which the parting claw is lifted up is set so that the dragging in the state where the split claws are inserted into the field scene is reduced, the rotational speed of the rotating case is set to the forward traveling speed of the rice transplanter. in case of the example dense planting by relatively fast against, missing increase from field surface of the split nail, only the rotating case faster the minute rotational speed of the sparse planting or Since faster than the quasi-planting, by the division pawl splashed backward mud by increases in the field plane, and a large digging pitting it behind planting seedlings.

In the case of this dense planting, the movement locus by the inconstant speed interlocking mechanism in the rotating case is matched with the dense planting in which the rotational speed in the rotating case is relatively faster than the forward traveling speed of the rice transplanter. The speed at which the split claws are lifted and removed from the farm scene is set so as to reduce the back-up of mud when the split claws are lifted and lifted from the farm scene. , When the rotation speed of the rotating case is set to be sparsely planted or standard planted by slowing the rotational speed of the rice transplanter relative to the forward traveling speed, only slow the minute speed, because slower remote I case of dense planting example, due to be dragged forward in a state where the split nail is inserted into the field plane, in the field plane , A big digging pitting it in front of planting seedlings.

  In other words, in the rotary seedling planting mechanism, when the planting performance is set so as to be suitable for sparse planting or standard planting with the rotational speed of the rotating case being slowed by the inter-shaft transmission mechanism, the rotational speed of the rotating case is set. If the plant speed is increased by the inter-shaft transmission mechanism, the seedlings cannot be properly planted. Of course, the planting performance is set according to the dense planting speed of the rotating case by the inter-shaft transmission mechanism. Then, there was a problem that proper seedling planting was not possible when the rotational speed of the rotating case was slowed down by the inter-strain transmission mechanism to make the planted loose or standard.

In the present invention, when the power transmission mechanism is configured to rotate at a non-uniform speed and resonate at a specific rotation speed, the phase at the non-uniform speed rotation is lower than the resonance rotation speed. The technical problem is to provide a rice transplanter with a rotary seedling planting mechanism that solves the above-mentioned problems, taking note of the fact that it shifts in the rotational direction so that it is substantially reversed on the higher side. It is what.

In order to achieve this technical problem, claim 1 of the present invention provides:
“ It has a traveling machine body equipped with a power source and supported by front and rear wheels, and a seedling planting device mounted on the traveling body so as to be able to be raised and lowered.
The seedling planting device is provided with a rotary seedling planting mechanism having a rotary case fixed to a lateral drive shaft to which power is transmitted from the power source through a transmission mechanism between strains , and the drive among the rotary cases at least equal two places on a circumference around the axis, Rutotomoni provided NaeUe body provided with a split nail, the rotating case, reverse the seedlings explant at a time during rotation of the rotating case direction is reciprocated only rotation is allowed by the respective seedling explant once up and down the split nail is oriented in the mounting base seedling posture, and, the reciprocating speed of rotation in the respective seedling explant Among them, an inconstant speed interlocking mechanism is provided that is delayed around the bottom dead center .
A rice transplanter,
Middle, rotation speed portion at the time when the said rotational case of its single rotation each seedling explants are in phase in the vicinity before and after the bottom dead center of the PTO power transmission mechanism for power transmission to the drive shaft from the strains transmission mechanism has established a non-uniform rotary mechanism of the order is by sea urchin non-uniform speed rotation made to fast,
Dense at the PTO of rotating parts non-uniform on the downstream side of the non-uniform rotary mechanism of the power transmission mechanism, the rotational speed when the planted sparsely planted or standard in the strains transmission mechanism the strains transmission mechanism When the plant speed change mechanism is densely planted by setting a specific rotation speed between the rotation speed at the time of planting as the resonance rotation speed, the rotation speed of the part rotating at an inconstant speed is the resonance rotation speed. And the phase of the inconstant speed rotation by the inconstant speed rotation mechanism is substantially reversed with respect to the phase of the inconstant speed rotation when the resonance speed is not exceeded. The rotation speed of the rotation phase is automatically shifted from the state where the split claw of the seedling planting mechanism is near the bottom dead center by an appropriate rotation angle in the rotation direction. ''
It is characterized by that.

Claim 2 of the present invention includes:
“In claim 1, the inconstant speed rotation mechanism is a pair of non-circular gears meshing with each other.”
It is characterized by that.

In the configuration as described in the claim 1, in a state where the rotational speed was slowed to a planted sparsely planted or standard in the strains transmission mechanism of the rotating case, the non-uniform rotary of the PTO power transmission mechanism Since the rotational speed at the part that rotates at a non-uniform speed on the downstream side of the mechanism does not exceed the resonant rotational speed at the part that rotates at a non-uniform speed, the part that rotates at a non- uniform speed does not resonate. The phase in which the rotation speed of the case is increased by the non-uniform rotation mechanism remains around the bottom dead center in the seedling plant of the rotation case.

  In this case, the speed at which the divided claws are lifted out of the field scene is adjusted by the inconstant speed interlocking mechanism in the rotating case and the inconstant speed rotating mechanism in accordance with the sparse planting or the standard planting. By setting so as to reduce the lifting up and dragging of the divided claws, sparse planting or standard planting can be stably performed under the condition that the digging holes before and after the planted seedling are made small.

Next, in the state where the rotational speed of the rotating case is increased so as to be densely planted by the inter-shaft transmission mechanism, the PTO power transmission mechanism rotates at an infinite speed downstream from the inconstant speed rotating mechanism. when the rotational speed of the part, Ri by the exceed resonance rotational speed at a portion rotating the non-uniform, pre Symbol unequal speed rotation of the phase due to non-uniform rotary mechanism, which does not exceed the resonance rotational speed The phase in which the rotational speed is increased among the inconstant speed rotations such that the rotation speed is substantially reversed with respect to the phase of the inconstant speed rotation is an appropriate rotation angle in the rotation direction from around the bottom dead center in the seedling body of the rotating case. Will only shift automatically.

  As a result, it is possible to reliably avoid that the speed at which the divided claws are lifted out of the field scene is increased by increasing the number of rotations in the rotating case to be densely planted. The speed of can be maintained at a value close to that in the case of the sparse planting or the standard planting, so that the dense planting is less dragged to the rear of the divided claws and the digging holes before and after the planted seedlings are made smaller Can be performed stably under

  In addition, when the division claw is set to dense planting instead of setting the speed at which the divided claws are lifted out of the field scene according to sparse planting or standard planting, the inter-strain shifting mechanism is sparsely planted or standardized. By manipulating the planting, the speed at which the divided claws are lifted off the field scene can be automatically adjusted to the sparse planting or the standard planting.

That is, according to the present invention, in bamboo for operating the strains transmission mechanism to either dense planting e or sparse planting and dense planting example, in any dense planting or sparse planting and close planting example of automatically, for approximately the same It can be performed in an optimal planting state.

  In addition, the configuration described in claim 2 has an advantage that the non-constant speed rotation mechanism can be reduced in size and weight by simplifying the configuration.

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

  1 and 2, reference numeral 1 denotes an eight-row riding type rice transplanter. The rice transplanter 1 includes a traveling machine body 2 supported by a pair of left and right front wheels 3 and a rear wheel 4, and the traveling machine body. 2 and a seedling planting device 6 for planting the field scene 5 so that it can be raised and lowered. The traveling machine body 2 is equipped with an engine 7 and a control seat 8; Furthermore, a traveling mission 9 for appropriately shifting the power from the engine 7 and transmitting it to the wheels 3 and 4 is mounted, and is configured to travel forward at an appropriate speed in the direction indicated by the arrow A. In the portion of the traveling machine body 2 adjacent to the rear portion of the control seat 8, a fertilizer application mechanism 10 for applying fertilizer to a portion of the farm scene 5 immediately before seedling planting by the seedling planting device 6 is provided. It is installed.

  In this case, the traveling aircraft body 2 is provided with a front axle 11 having the traveling mission 9 at a front portion thereof and a rear axle 13 connected to the front accelerator 11 via a tubular frame 12 at a rear portion thereof. It has been.

  The front wheels 3 are attached to the front axle 11 and the rear wheels 4 are attached to the rear axle 13, respectively. The power from the engine 7 is first appropriately shifted by the traveling mission 9, and then the front axle. 11 is transmitted to both front wheels 3 via axles (not shown), and at the same time, a shaft (not shown) in the cylindrical frame 12 and an axle (not shown) in the rear axle 13 are transmitted. To the two rear wheels 4.

  The seedling planting device 6 includes a transmission case 14 for transmitting power from the engine 7, eight rotary seedling planting mechanisms 15 arranged in parallel in the transmission case 14 in the horizontal direction at appropriate intervals, and left and right It is constituted by a seedling stage 16 that is inclined backward and downward so as to reciprocate, and a plurality of floats 17 that are arranged so as to slide on the surface of the farm scene 5 between the seedling planting mechanisms 15. ing.

  As shown in FIG. 6, the transmission case 14 includes a first case 19 having a power input shaft 18 from the engine 7, a pipe-like second case 20 extending laterally from the first case 19, and The seedling planting mechanism 15 includes four third cases 21 that extend rearward from the second case 20 at an appropriate interval in the lateral direction. The second case 20 is provided with transmission shafts 24 for transmitting power to the drive shafts 22 of the third cases 21 via the shafts 23, respectively. The first case 19 is provided with a main shaft 26 that transmits power from the power input shaft 18 via a bevel gear mechanism 25 and a power transmission mechanism 27 from the main shaft 26 to the transmission shaft 24. ing. Further, power is transmitted from the main driving shaft 26 to a seedling table lateral feed mechanism (not shown).

  On the other hand, the traveling mission 9 in the traveling machine body 2 is provided with a stock shifting mechanism 28 that receives the power branched from the engine 7, and the upper surface of the rear axle 13 is not described in detail later. A constant speed rotation mechanism 29 is attached, and the first PTO power transmission shaft 30 from the inter-gear transmission mechanism 28 is connected to an input shaft 31 in the inconstant speed rotation mechanism 29, and an output shaft 32 in the inconstant speed rotation mechanism 29. Further, a power input shaft 18 in the seedling planting device 6 is connected via a second PTO power transmission shaft 33 having a universal shaft joint at both ends, and the rotational speed of the drive shaft 22 in each seedling planting mechanism 15 is The inter-stock transmission mechanism 28 is configured to change gears as appropriate.

  Each seedling planting mechanism 15 is configured as shown in FIGS.

That is, a rotary case 34 that is oval in a side view is detachably fixed to both ends of the drive shaft 22 protruding from the third case 21, and the rotary case 34 is transplanted by the drive shaft 22. As shown by an arrow B in a side view of the machine 1, it rotates (revolves) counterclockwise . A sun gear 35 is rotatably fitted on the drive shaft 22 in the rotating case 34. The sun gear 35 is locked to the third case 21 through a connecting member 36 so as not to rotate.

  An operation shaft 37 for a pusher, which will be described later, is pivotally supported in parallel with the drive shaft 22 at positions where the distance from the drive shaft 22 is equal at the outer peripheral portion of the rotating case 34, that is, both left and right end portions. A hollow planting shaft 38 is rotatably fitted on both operating shafts 37 in the rotating case 34.

The end portions of the planting shaft 38 and the operating shaft 37 project outward from the side surface of the rotating case 34, and the projecting ends of the planting shafts 38 are opened to the upper surface with a light alloy such as an aluminum alloy. A hollow seedling plant 39 is attached with a bolt 30 , and a split claw 40 is fixed to a boss portion 39 a at the tip of each seedling plant 39 in a posture toward the seedling mount 16. On the other hand, the tip of the operating shaft 37 protrudes into the hollow portion of the seedling plant 39, and a cam 41 for pushing operation is fixed to this portion.

  A planetary gear 42 having the same number of teeth as the sun gear 35 is fitted on each planting shaft 38, while the sun gear 35 and the planetary gear 42 are connected to the rotating case 34. An intermediate gear 43 that meshes at the same time is provided to constitute a gear train mechanism. When the rotating case 34 revolves only once counterclockwise in this gear train mechanism, each planting shaft 38 is moved clockwise. By rotating only once, each seedling plant 39 is reciprocated between the seedling stage 16 and the field scene 5 in a state in which the divided claw 40 maintains a posture toward the seedling stage 16. It is configured as follows.

The sun gear 35, the planetary gear 42, and the intermediate gear 43 that constitute the gear train mechanism are arranged as described in, for example, Japanese Patent Publication No. 63-20486 and Japanese Patent Publication No. 63-74413. The tip of the split claw 40 in each seedling plant 39 is constituted by a non-circular gear such as a core gear, and the rotational speed of each seedling plant 39 is delayed in the vicinity of the bottom dead center of the reciprocating motion. However, as shown in FIG. 5, it is configured to draw an elliptical closed-loop motion trajectory 44 that is long in the vertical direction.

  The boss portion 39a of each seedling plant 39 is provided with an extrusion shaft 45 constituting an extrusion tool so as to slidably penetrate in an axial direction extending in parallel with the longitudinal direction of the divided claw 40, and its lower end A pushing piece 46 having a U-shaped cross section is fixed so as to be close to the rear surface of the divided claw 40, and the upper end of the pushing shaft 46 projects into the seedling plant 39. At the upper end, the tip of an extrusion lever 47 pivotally attached by a pin 46 so as to swing and rotate in the vertical direction in the seedling plant 39, and the extrusion shaft 45 is moved downward by the extrusion lever 47. It moves forward in the direction toward the tip of the split claw 40, and the push-out shaft 45 retreats in the direction from the tip of the split claw 40 toward the root by the upward rotation of the push-out lever 47. It is connected via a single 48.

  The seedling plant 39 is provided with spring means 49 for urging the pushing lever 47 in the downward direction, and the base end of the pushing lever 47 serves as the outer peripheral surface of the pushing operation cam 41. In contact with the rotation of the rotating case 34, the tip of the divided claw 40 in each seedling plant 39 is rotated with the rotation of the rotating case 34, and the bottom dead center at the lower end of the reciprocating movement is reached. The pushing lever 47 is rotated downward by the biasing force of the spring means 49, and the seedlings 39 are moved from the bottom dead center of the reciprocating motion as the rotating case 34 rotates. When moving upward, the push-out lever 47 is configured to rotate upward against the spring means 49.

  Furthermore, the bottom plate of the seedling plant 39 is integrally provided with a boss portion 50 projecting into the seedling plant body 39, and a soft elastic body 51 such as rubber can be attached to and detached from the boss portion 50. And the push-out lever 47 contacts the upper surface of the soft elastic body 51 at the end of the downward rotation.

  On the other hand, the non-uniform speed rotation mechanism 29 is configured as shown in FIGS.

  That is, the input shaft 31 and the output shaft 32 are supported in parallel in the gear case 53 with an appropriate distance between the axes, and the intermediate shaft 53 is connected in parallel between the input shaft 31 and the output shaft 32. The intermediate shaft 53 and the input shaft 31 are interlocked so that the rotation of the input shaft 31 is transmitted to the intermediate shaft 53 at the same rotational speed by a pair of gears 54 and 55 meshing with each other. On the other hand, the rotation of the intermediate shaft 53 is transmitted to the output shaft 32 at the same rotational speed by a pair of gears 56 and 57 that mesh with the intermediate shaft 53 and the output shaft 32. It is configured to be linked to.

  Then, as shown in FIG. 10, a pair of gears 56 and 57 meshing with each other between the intermediate shaft 54 and the output shaft 32 is eccentrically decentered from the center of each shaft by a dimension e as shown in FIG. By configuring the rotating case 34 as a non-circular gear such as an eccentric gear, the rotational speed of the rotating case 34 is in a phase position around the bottom dead center of the seedlings 39 in one rotation. It is configured to rotate at an unequal speed so as to be partially faster at times.

  Further, the inconstant speed rotation mechanism 29 is shifted to one side so that the first PTO power transmission shaft 30 from the inter-shaft transmission mechanism 28 in the traveling mission 9 extends straight in the traveling direction in a plan view (FIG. 4). A part of the upper surface of the rear axle 13 that is detachably attached to the upper surface of the rear axle 13 is displaced to the side opposite to the inconstant speed rotating mechanism 29. A fan 10a is provided.

  Along with the rotation (revolution) of the rotating case 34 in the direction of arrow B, the seedlings 39 rotate around the planting shaft 38 in the direction opposite to the direction of the arrow B by the same rotation angle as that of the revolution. Therefore, each seedling plant 39 revolves so that the divided claws 40 reciprocate in the up-down direction with the divided claw 40 facing the direction of the seedling rest 16. When descending from top to bottom on the side facing the top surface of 16, after splitting only one seedling from the seedling mat on the seedling mounting table 16 with the split claw 40 at the tip, this one seedling is lowered The tip of the split claw 40 enters the farm scene 5 in the vicinity of the lower bottom dead center.

  At this time, the pushing lever 47 in the seedling plant 39 is rotated downward by the spring force of the spring means 49, so that the pushing piece 46 moves forward toward the tip of the dividing claw 40. A single seedling at the tip of the nail 40 is planted in the field scene 5 so as to be pushed out.

  When planting of the seedling is completed, the pushing piece 47 moves backward, and at the same time, the split claw 40 moves upward so as to come out of the field scene 5.

  When this rice planting operation is performed with a sparse planting or standard planting with a planting number of less than 50-60 plants per 3.3 square meters, the rotation speed in the rotating case 34 is changed to a speed change operation in the inter-strain changing mechanism 28. In the case where the rotation speed is set to N1 at the time of the sparse planting or the standard planting, the rice planting operation is performed as a dense planting in which the number of planted plants per 3.3 square meters is larger than the sparse planting or the standard planting. The rotational speed in the case 34 is increased to the rotational speed N2 at the time of dense planting by the speed change operation in the inter- stock change mechanism 28.

  During this rice planting operation, the rotating case 34 is partially moved by the inconstant speed rotating mechanism 29 when the rotational speed of each of the seedlings 39 is in the phase position around the bottom dead center of the one rotation. It is rotated at a non-uniform speed so as to be faster.

  Therefore, since the rotation of the seedlings 39 of the rotating case 34 becomes faster around the bottom dead center, the speed at which the divided claws 41 are lifted from the field scene 5 is increased. When the non-circular gears 56, 57 in the gear mechanism 35, 42, 43 and the non-constant speed rotation mechanism 29 are used for loose planting or standard planting of the rotational speed N1 in the rotating case 34, By setting so as to reduce the drag of the split claws, the tip of the split claws 40 draws a traveling movement locus as indicated by reference numeral 44 'in FIG. This can be carried out stably in a state where the front and rear digging holes are made small.

Next, of the PTO power transmission mechanism from the inter-strain changing mechanism 28 to the seedling planting device 6, the part that rotates at a non-uniform speed downstream from the non-uniform speed rotation mechanism 29, that is, the second PTO power transmission shaft 33, constituting the power input shaft 18, the transmission shaft 24 and the shaft 23, Oite the the rotational speed N1 of the sparse planting or standard planting, the rotational speed between the rotational speed N2 of the dense planting example, so as to resonate To do.

A portion of the PTO power transmission mechanism to the seedling planting device 6 that rotates at a non-uniform speed downstream from the non-uniform speed rotation mechanism 29 is the rotational speed N1 of the sparse planting or standard planting and the rotation of the dense planting. the Runisaishite is Oite resonance rotational speed between the number N2, the setting of the shaft diameter and / or length in each axis 33,18,24,23, stiffness settings to these bearing portions, the bearing portion backlash It is possible to adopt the setting with the rigidity and the setting of the rigidity to the transmission case 14, and it is possible to employ a combination of two or more of these.

With this configuration, when the rotational speed of the rotating case 34 is increased to N2 so as to be densely planted by the inter-gear transmission mechanism 28, the second PTO power transmission shaft 33, the power input shaft 18, the transmission unequal rotational speed, Ri by the fact that beyond the resonance rotational speed in the power transmission unit, according to prior Symbol non-uniform rotary mechanism 29 at the time when the power transmission portion including a shaft 24 and the shaft 23 rotates non-uniform The phase in which the rotational speed is increased in the non-constant speed rotation is such that the phase of the fast rotation is substantially reversed with respect to the phase of the inconstant speed rotation when the resonance rotational speed is not exceeded. Thus, the seedling plant body 39 is automatically shifted from the vicinity of the bottom dead center by an appropriate rotation angle in the rotation direction.

As a result, it is possible to reliably avoid the speed at which the divided claw 40 comes off from the farm scene 5 and increases as the number of rotations in the rotating case 34 is increased so as to densely plant, the rate at which rising, the can be maintained at a value close to that of the sparse planting or standard planting, therefore, the travel motion path at the tip of the divided pawl 40 in when the dense planting example, the sparse planting or Ki out Rukoto traveling to approximate the motion trajectory 44 'when the standard planting, the example dense planting can be carried out under conditions of reduced digging holes before and after planting seedlings stably.

  In addition, instead of setting the speed at which the divided claws 40 are lifted out of the farm scene 5 in accordance with the sparse planting or the standard planting, the sparse planting in the inter-strain transmission mechanism 28 is set by setting the dense planting. Alternatively, by performing an operation for standard planting, the speed at which the divided claws 40 are lifted from the field scene 5 can be automatically adjusted to the sparse planting or standard planting.

It is a side view of a riding type rice transplanter. It is a top view of a riding type rice transplanter. It is a side view of a traveling machine body. FIG. 4 is a plan view of FIG. 3. It is a principal part expanded side view of the seedling planting apparatus in FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. FIG. 7 is an enlarged sectional view taken along the line VII-VII in FIG. 5. FIG. 8 is an enlarged sectional view taken along line VIII-VIII in FIG. 7. It is an expansion vertical front view of an inconstant speed rotation mechanism. FIG. 10 is a sectional view taken along line XX in FIG. 9.

DESCRIPTION OF SYMBOLS 1 Rice transplanter 2 Traveling machine body 3, 4 Wheel 5 Farm scene 6 Seedling planting device 9 Traveling mission 14 Transmission case 15 Seedling planting mechanism 16 Seedling stand 17 Float 22 Drive shaft 28 Inter-shaft speed change mechanism 29 Non-uniform speed rotation mechanism 30 1st PTO power Transmission shaft 31 Input shaft to the inconstant speed rotation mechanism 32 Output shaft from the inconstant speed rotation mechanism 33 Second PTO power transmission shaft 34 Rotating case 35 Sun gear 39 Seedling body 40 Dividing claw 42 Planetary gear 43 Intermediate gear 56, 57 Non-circular gear

Claims (2)

A traveling machine body mounted with a power source and supported by the front and rear wheels, and a seedling planting device mounted on the traveling machine body so as to be able to move up and down;
The seedling planting device is provided with a rotary seedling planting mechanism having a rotary case fixed to a lateral drive shaft to which power is transmitted from the power source through a transmission mechanism between strains , and the drive among the rotary cases at least equal two places on a circumference around the axis, Rutotomoni provided NaeUe body provided with a split nail, the rotating case, reverse the seedlings explant at a time during rotation of the rotating case direction is reciprocated only rotation is allowed by the respective seedling explant once up and down the split nail is oriented in the mounting base seedling posture, and, the reciprocating speed of rotation in the respective seedling explant Among them, an inconstant speed interlocking mechanism is provided that is delayed around the bottom dead center .
A rice transplanter,
Middle, rotation speed portion at the time when the said rotational case of its single rotation each seedling explants are in phase in the vicinity before and after the bottom dead center of the PTO power transmission mechanism for power transmission to the drive shaft from the strains transmission mechanism has established a non-uniform rotary mechanism of the order is by sea urchin non-uniform speed rotation made to fast,
Dense at the PTO of rotating parts non-uniform on the downstream side of the non-uniform rotary mechanism of the power transmission mechanism, the rotational speed when the planted sparsely planted or standard in the strains transmission mechanism the strains transmission mechanism When the plant speed change mechanism is densely planted by setting a specific rotation speed between the rotation speed at the time of planting as the resonance rotation speed, the rotation speed of the part rotating at an inconstant speed is the resonance rotation speed. And the phase of the inconstant speed rotation by the inconstant speed rotation mechanism is substantially reversed with respect to the phase of the inconstant speed rotation when the resonance speed is not exceeded. The rotation speed of the rotation phase is automatically shifted by an appropriate rotation angle in the rotation direction from a state where the division claw of the seedling planting mechanism is near the bottom dead center. Characteristic rice planting .   2. The rice transplanter according to claim 1, wherein the inconstant speed rotation mechanism is a pair of non-circular gears meshing with each other.

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