JP2001224213A - Rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice transplanter which can form small holes on the surface of a paddy field by the use of planting tines to suitably plant seedlings without disarranging the postures of the seedlings and without bringing down the seedlings, even when the intrarow spacing of the seedlings is largely changed. SOLUTION: This transplanter provided with a planting mechanism 18 having a planting tine 28 which is circulated on a longitudinally long tine tip circulation locus P ranged from the lower end of a seedling carriage 16 to the surface of the paddy field T, is characterized by disposing an irregular motion transmission mechanism in a transmission system toward the planting mechanism 18 and furthermore setting the speed of a planting process for planting a taken seedling on the surface T of the paddy field at a larger speed than the speed of the downward movement process of the planting tine 28 for taking out the seedling from the seedling carriage 16 to the surface T of the paddy field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice transplanter having a planting mechanism having a planting claw that circulates and rotates with a vertically long toe rotation locus extending from a lower end of a seedling rest to a rice field surface, and in particular, to its drive. The present invention relates to a rice transplanter having a structure.

[0002]

2. Description of the Related Art As a planting mechanism of a rice transplanter, there are used a mechanism that drives a planting claw in a crank type and a rotary type that has planting claws at both ends of a rotating case. The planting mechanism is driven at a constant speed.

[0003]

In the rice transplanter, by changing the speed of the planting mechanism with respect to the moving speed of the machine, the interval in the machine traveling direction of the planted seedlings, that is, the so-called interplant, can be selected. However, when a large change was made between stocks, the following problems occurred.

[0004] For example, if the planting is switched so that the planting is made larger than the standard and the planting is performed loosely, the speed of the planting mechanism is changed so that the speed of the planting mechanism becomes slower than the moving speed of the body. The operating speed also slows down, and in the planting process where the planting claws push the seedlings into the rice field, the time during which the planting claws rush into the rice field becomes longer, and the holes drilled on the rice field by the planting claws become larger, resulting in planting. A phenomenon that the posture of the seedlings deteriorates and sometimes the planted seedlings fall down is caused.

Conversely, if the plant is switched so that the planting is made smaller than the standard and dense planting is performed, in this case, the speed of the planting mechanism is changed so as to increase the speed of the planting mechanism with respect to the moving speed of the airframe. The operating speed also increases, and the speed at which the planting nail enters the rice field is too high, so that the seedlings separated from the planting nail may disturb the posture with excessive momentum.

The present invention has been made in view of such a point, and it is a main object of the present invention to make it possible to carry out planting suitably even if the number of strains is largely changed.

[0007]

Means for Solving the Problems [Structure, operation and effect of the invention according to claim 1]

(Structure) The rice transplanter according to the first aspect of the present invention includes a planting mechanism having a planting claw that circulates and rotates with a vertically long claw tip turning locus extending from the lower end of the seedling rest to the rice field. The transmission system has a non-constant speed transmission mechanism, and the speed of the planting process of planting the extracted seedlings on the rice field is faster than the speed of the descending process in which the planting claws take out the seedlings from the seedling cradle and move toward the rice surface. Is set to be faster.

(Operation) According to the above configuration, the time during which the planting nail is intruding into the rice field surface during the planting process is shorter, and is smaller than the hole drilled on the rice field surface by the planting nail when operating the planting nail at a constant speed. Becomes

(Effects) Therefore, according to the first aspect of the present invention, even if the circulating operation speed of the planting claws is reduced with respect to the traveling speed, the posture of the planted seedlings deteriorates, and sometimes the planted seedlings fall down. Such a phenomenon has disappeared, and large sparse planting between plants has been successfully performed.

[Structure, operation and effect of the invention according to claim 2]

(Structure) The rice transplanter according to the second aspect of the present invention includes a planting mechanism having a planting claw that circulates and rotates with a vertically long claw tip turning locus extending from the lower end of the seedling rest to the rice field. A non-constant speed transmission mechanism in the power transmission system, and the seedling removal passing through the lower end of the seedling pedestal rather than the speed of the descending stroke in which the planting claw takes out the seedling from the nest and moves toward the rice field surface It is characterized in that the speed of the process and the speed of the planting process of planting the extracted seedlings on the rice field are set to be high.

(Function) According to the above configuration, in the seedling removal process in which the planting nail passes through the lower end of the seedling rest, the time required for passing the seedling rest is shortened, and the planting nail is circulated at a constant speed. The planting claw also quickly cuts out the seedling placed on the seedling mounting table, so that even a seedling with strong root entanglement and poor separability can be reliably cut off. Also,
During the planting process of the planting nail, the time during which the planting nail enters the rice field is shortened, and the hole is smaller than the hole drilled on the rice field by the planting nail when circulating the planting nail at a constant speed.

(Effects) Therefore, according to the second aspect of the present invention, even if the circulating operation speed of the planting claws is reduced with respect to the traveling speed, cutting of the seedlings by the planted seedlings can be performed quickly and favorably. In addition to stabilizing the yield of the seedlings, there was no phenomenon that the posture of the planted seedlings deteriorated or the planted seedlings sometimes fell down, so that large sparse planting between plants could be favorably performed.

[Structure, operation and effect of the invention according to claim 3]

(Structure) According to a third aspect of the present invention, in the rice transplanter according to the first or second aspect, the unequal speed transmission mechanism is constituted by a pair of eccentric gears or non-circular gears that are engaged. The rotation phase of the eccentric gear or the non-circular gear with respect to the planting mechanism can be changed.

(Operation) According to the above configuration, by changing the rotation phase of the eccentric gear or the non-circular gear with respect to the planting mechanism, the speed of the descending stroke at which the planting claw takes out the seedling from the seedling cradle and moves toward the rice field surface. Rather than setting so that the speed of the planting process of planting the extracted seedlings on the rice field is faster, or conversely, the speed of the descending process in which the planting claws take out the seedlings from the seedling cradle and move toward the rice surface, It is possible to set so that the speed of the planting process of planting the extracted seedlings on the rice field is slowed down. The former is suitable for sparse planting, and the latter is suitable for dense planting. Also, these intermediate states can be revealed.

(Effects) Therefore, according to the third aspect of the present invention, by changing the circulating operation speed of the planting claw with respect to the traveling speed, and changing the rotation phase of the eccentric gear or the non-circular gear with respect to the planting mechanism. The specifications can be easily changed to sparse planting specifications, dense planting specifications, or standard planting specifications between plants, resulting in excellent practical convenience.

[Structure, operation and effect of the invention according to claim 4]

(Structure) According to a fourth aspect of the present invention, there is provided a rice transplanter according to any one of the first to third aspects, wherein the speed of the planting mechanism with respect to the body running speed is changed to a plurality of stages. A gear transmission unit having a serial transmission relationship with the inter-stock transmission mechanism is provided outside a transmission case incorporating a transmission mechanism, and a pair of gears in the gear transmission unit can be rearranged.

(Action) According to the above configuration, the inter-gear transmission mechanism in the transmission case is switched to the lowest speed, and further reduced by the pair of gears in the gear transmission section outside the transmission case. The speed of the planting mechanism can be set to a speed suitable for loose planting.

(Effects) Therefore, according to the fourth aspect of the present invention, it is not necessary to previously incorporate a large number of inter-gear transmission mechanisms including the sparsely planted specification into the transmission case, or disassemble the transmission case. Without the hassle of changing the inter-gear transmission mechanism to the sparsely planted specification,
A desired sparse planting specification can be obtained by a simple change process only by changing gears outside the transmission case, and the practical convenience is large.

[Structure, operation and effect of the invention according to claim 5]

(Structure) A rice transplanter according to a fifth aspect of the present invention is the rice transplanter according to any one of the first to fourth aspects, further comprising a planting clutch having a fixed position stopping function in a transmission system to the planting mechanism. In addition, the on / off phase of the planting clutch is matched to the rotational phase at which the planting mechanism operates at or near the minimum speed.

(Function) According to the above configuration, the clutch engagement / disengagement operation is performed in a state where the planting mechanism operates at the minimum speed or a speed close to the minimum speed. The impact at which the planting mechanism stops is relatively small.

(Effects) Therefore, according to the invention of claim 5, the starting impact and the stopping impact when the planting clutch is turned on and off are small, and a smooth planting operation can be performed as a whole.

[Structure, operation and effect of the invention according to claim 6]

(Structure) In a rice transplanter according to a sixth aspect of the present invention, in the invention according to the fifth aspect, the unequal-speed transmission mechanism is arranged on the transmission upper side of the planting clutch.

(Operation) According to the above configuration, the planting clutch itself rotates at an irregular speed, so that the clutch disengaging operation is performed without difficulty and without overrun when operating at the minimum speed or a speed close thereto. That is, an accurate fixed position stop is performed. Also, when the interlocking type planting clutch is turned on and off, since the clutch is operated at the minimum speed or a speed close thereto, the clutch engagement operation is performed smoothly with little impact. In particular, in the case of an interlocking type planting clutch, a relatively large play is formed in the interlocking portion to ensure the operation of engaging the clutch. According to the configuration of the present invention, the play formed at the bite portion is small, and therefore, the impact when the bite is started is further reduced.

(Effects) Therefore, according to the invention of claim 6, the function of stopping the fixed position of the planting clutch can be enhanced by rationally interposing the planting clutch in the unequal-speed rotary transmission system. In addition, it is effective in improving the durability of the planting clutch by enabling the operation of engaging the clutch with less impact.

[Structure, operation and effect of the invention according to claim 7]

(Structure) In the rice transplanter according to the present invention according to the seventh aspect, in the invention according to any one of the first to sixth aspects, the seedling rest is reciprocated and laterally moved with a constant stroke in a feed case. A mounting platform horizontal feeding mechanism, a seedling vertical feeding mechanism that sends the seedlings placed on the seedling mounting base downward, and a transmission means to the planting mechanism, and the transmission mechanism to the feed case includes the non-constant speed transmission mechanism. Has been deployed.

(Operation) According to the above configuration, when the seedling placing table reaches the end of the horizontal feed stroke and the lowest row of the placed seedlings is taken, the seedling vertical feed mechanism operates to feed, and then the next row. The first seedling removal is performed. Therefore, when the planting claw is set to the sparse planting specification in which the speed of the planting process of planting the extracted seedlings on the rice field is faster than the speed of the descending process of moving the seedlings from the seedling mounting table and moving toward the rice field, The timing at which the seedling rest reaches the end of the horizontal feed stroke and the feed operation of the vertical seedling feed mechanism corresponds to the low-speed phase in the unequal speed rotation. For this reason, the lateral movement acceleration at the time when the seedling placing table reverses and laterally moves at the stroke end is low, and the lateral displacement due to the inertia of the placed seedling is reduced. Further, in the seedling vertical feeding mechanism for vertically feeding the seedlings placed on the transport belt, the slip between the transport belt and the seedlings is eliminated because the seedling feeding operation of the vertical seedling feeding mechanism is performed at a low speed.

(Effects) Therefore, according to the invention of claim 7, it is possible to reduce the problem that the seedlings placed on the seedling rest are displaced due to the reversal lateral feeding of the seedling rest, and The seedlings can be reliably fed vertically without slips, which is effective in stabilizing the amount of seedlings collected.

[0035]

FIG. 1 is an overall side view showing an embodiment of a rice transplanter according to the present invention. This rice transplanter is provided with a six-row seedling planting at a rear portion of a four-wheel drive type riding traveling machine body 3 having a steering front wheel 1 and a rear wheel 2 via a lifting link mechanism 5 driven by a hydraulic cylinder 4. Device 6
Are connected so as to be able to move up and down freely.

An engine 7 is provided at the front of the riding traveling body 3.
The engine 7 and a transmission case 8 having the steered front wheels 1 are interlocked by a main transmission 9 constituted by a belt-type continuously variable transmission, and the engine output is shifted by the main transmission 9. After that, the power is transmitted to the transmission case 8 and branched into a traveling system and a working system. The power of the traveling system is transmitted to the left and right steering front wheels 1 and the main shaft 10 of the lower abdomen of the body.
After being transmitted to the rear transmission case 11 through the rear of the fuselage, the power is transmitted to the left and right rear wheels 2 and further, the power of the working system branched in the transmission case 8 is transmitted to the work transmission shaft 12 at the lower abdomen of the fuselage. The transmission is transmitted to the seedling planting device 6 via the transmission shaft 13.

As shown in FIG.
Is a rectangular pipe-shaped horizontally long frame 14 connected to the rear end of the elevating link mechanism 5, a feed case 15 receiving the power of the working system via the transmission shaft 13, and a seedling F. The seedling rest 16 which moves laterally, a plurality of planting cases 17 extending in a cantilevered manner from a plurality of longitudinal positions of the horizontally long frame 14, and each planting case 17
Rotary planting mechanism 1 installed on the left and right rear end
8, a plurality of leveling floats 19 for leveling the planned planting location of the rice field T, etc., and the feed case 15 is a screw feed type seedling for feeding the seedling mounting table 16 reciprocally sideways with a constant stroke. The seedling F placed every time the table lateral feed mechanism 20 and the seedling placing table 16 reach the stroke end.
A belt-type seedling vertical feeding mechanism 21 for feeding the seedling vertically to the seedling outlet a at the lower end of the seedling mounting table 16 is provided.

As shown in FIGS. 2 and 5, a lateral transmission shaft 22 for receiving power from the feed case 15 is provided at the base end of the planting case 17, and the power of the lateral transmission shaft 22 is supplied to the driving sprocket. 23, the driven sprocket 24, and the planting drive shaft 2 via the chain 25.
6 to drive the left and right planting mechanisms 18 connected to both projecting ends of the planting drive shaft 26. The planting mechanism 18 includes a rotating case 27 connected to a planting drive shaft 26 and a pair of planting claws 28 rotatably mounted on both ends of the rotating case 27. The rotating case 27 makes one rotation forward (revolution). Then, each planting claw 28 rotates in the reverse direction by one rotation (rotation), and the planting claw 28 revolves around the rotating case 27 so that the tip of the planting claw 28 draws a vertically long rotation locus P. A gear mechanism for rotating at an irregular speed is incorporated.

Here, the chain transmission from the driving sprocket 23 to the driven sprocket 24 is a transmission with half reduction, and the rotation case 27 makes one rotation with two rotations of the transmission shaft 22. In addition, the chain 25
In this case, the tie toner 29 is moderately strongly pressed by the pressing bolt 30, and the vibration of the chain 25 during driving is suppressed.

FIGS. 3 and 4 show a transmission structure in the transmission case 8. An input shaft 31 of the transmission case 8 has a driven pulley 32 of the main transmission 9.
Are loosely fitted, and the driven pulley 32 and the input shaft 3
1, a main clutch 33 composed of a dry multi-plate clutch is provided in a biased state with the clutch engaged, and is operated to be depressed by depressing a main clutch pedal 34 provided at the foot of the operating unit.

The power transmitted to the input shaft 31 is transmitted to the gear G1.
, G2 to the second shaft 35, and then to the third shaft 37 via the auxiliary transmission mechanism 36. Sub transmission mechanism 3
6 is a shift gear G3 spline-mounted on the third shaft 37.
Is shifted to perform two forward speeds and one reverse speed. By engaging the shift gear G3 with a gear G4 fixed to the second shaft 35 as shown in the figure, a low forward speed, which is the planting operation speed, is obtained. By shifting the shift gear G3 to the left and engaging the gear G5 loosely fitted on the third shaft 37 from the side, a high forward speed, which is a moving speed, is obtained, and the shift gear G3 is shifted to the right. By shifting and engaging with the gear G6 of the fourth shaft 38, reverse travel can be obtained. The forward high speed gear G5 is operatively connected to a gear G8 integrated with the input shaft via a gear G7 loosely fitted to the second shaft 35, and a fourth shaft 38 to which the reverse gear G6 is fixed.
Is linked to the second shaft 35 via gears G9 and G10.

The shifting power transmitted to the third shaft 37 is transmitted to the left and right front wheel axles 40 via the gear G11 and the front wheel differential device 39, and is also transmitted to the rear wheel driving main shaft 10. ing.

The gear G2 of the second shaft 35 is in a standard transmission state in which it meshes with the gear G1 of the input shaft 31, as shown in the figure.
The gear G detached from the gear G1 and loosely fitted on the second shaft 35
7 is configured to be shiftable to a deceleration transmission state in which the claw is engaged from the side, and by selecting this deceleration transmission state and selecting forward or low speed or reverse with the shift gear G3, it is possible to travel at a lower speed. It can be used for crossing ridges and transporting vehicles to and from loading platforms.

The fourth shaft 38 serves as a transmission shaft for the working system branched from the traveling system. The fourth shaft 38 projects outward from the transmission case 8 and is connected to the second shaft 35. Fifth axis 41 concentrically installed is also mission case 8
And the fourth shaft 38 and the fifth shaft 4
A gear transmission portion 42 is provided on the outside of the case 1 and is covered by a detachable cover case 43.

As shown in FIG.
Is configured to perform a large gear reduction for sparse planting. The small-diameter gear G12 is spline-mounted on the case-out projecting portion 38a of the fourth shaft 38, and the spline is formed in the case-out projecting portion 41a of the fifth shaft 41. The mounted large-diameter gear G13 is engaged, and the fifth shaft 41 is largely driven to reduce speed.

The fifth shaft 41 driven in such a manner as described above,
An inter-stock transmission mechanism 45 is provided over the sixth shaft 44. This inter-stock transmission mechanism 45 selects and engages two-stage shift gears G17, G18 spline-mounted on the sixth shaft 44 with three gears G14, G15, G16 provided on the fifth shaft 41. , The sixth shaft 44 can be shifted in three stages.

The power of the working system thus shifted is transmitted from the sixth shaft 44 via the bevel gears G19 and G20 to the forward and backward seventh shaft 46, and then transmitted to the torque limiter 4
7. Variable speed transmission mechanism 48 and planting clutch 49
, And transmitted to the feed case 15 of the seedling planting device 6 by the work transmission shaft 12 and the transmission shaft 13.

The torque limiter 47 engages and interlocks a drive-side disk 51 spline-mounted on the seventh shaft 46 so as to be slidably displaceable and a driven-side disk 52 loosely fitted on the seventh shaft 46 via a transmission ball 53. In addition, the drive side disk 51 is configured to be strongly pressed against the driven side disk 52 by a spring 54. When the rotation load of the driven side disk 52 becomes larger than a set value, the drive side disk 51 resists the spring 54. As a result, the transmission of the rotational power from the drive-side disk 51 to the driven-side disk 52 is interrupted, so that an excessive load is applied to the seedling planting device 6.

The unequal speed transmission mechanism 48 includes an eccentric gear 56 integrated with the driven disk 52 and an output shaft 5 for work.
The eccentric gear 57 that is loosely fitted to the gear 0 is engaged. As shown in FIGS. 4 and 6, these eccentric gears 56 and 57 are composed of eccentric spur gears in which the center of rotation of a circular gear having the same diameter is deviated from the center of the circle. The eccentric gear 57, which is driven by one rotation, is rotated one rotation with characteristics as shown in FIG.

As shown in FIGS. 4 and 6, the planting clutch 49 has a clutch boss 58 which is spline-mounted on the working output shaft 50 so as to be slidably displaceable, and the eccentric gear 57 has partially arcuate engaging projections 57a, 58a. , And slidably urged in the engaging direction by a spring 59. The shift fork 60 is rotated counterclockwise around the support shaft 61 to move the clutch boss 58 to the spring 59.
The power output from the working output shaft 50 is cut off by disengaging the eccentric gear 57 with the eccentric gear 57, and the traction arm extending from the shift fork 60. The rotation of the shift fork 60 in the clutch disengaging direction is allowed only when the position 60a coincides with the concave portion 58c formed by cutting out one place in the circumferential direction of the restraining flange portion 58b of the clutch boss 58. In other words, the planting clutch 49 is provided with a fixed position stop function that allows the clutch to be turned on and off only in a set phase within a certain small range during one rotation.

Since the working output shaft 50 to which power is transmitted as described above rotates at an irregular speed with the characteristics shown in FIG. 7, the seedling planting device 6 receiving this power also operates at an irregular speed. That is, when unequal-speed rotation power is input to the feed case 15, the transmission shaft 22 traversed at the base of the planting case 17 rotates at unequal speed, and this is reduced by half to the planting drive shaft 26. By being transmitted, the rotating case 27 of the planting mechanism 18 repeats two high-speed states and two low-speed states during one rotation. Here, the speed of the descending stroke in which the planting claws 28 provided at both ends of the rotating case 27 take out the seedlings from the seedling rest 16 and move toward the rice field T, and the planting claws 28 move from the rice surface T to the seedling rests. The speed of the ascending stroke of moving to the lower end of the seedling 16 is slow, and the speed of the seedling taking-out process passing through the lower end of the seedling rest 16 and the extracted seedlings
The rotation phase of the rotating case 27 is set so that the speed of the planting process for planting the garments in the garbage can be increased.

FIG. 8A shows a working transmission system in which the above-mentioned unequal-speed transmission mechanism 48 is introduced, in which the inter-stock transmission mechanism 45 is set between the largest stocks to perform sparse planting (for example, 24 cm between stocks). FIG. 8 (b) shows the trajectory of the tip of the planting claw 28 relative to the rice field surface T. FIG. Field T of planting claw 28 when performing sparse planting
5 shows a trajectory of the claw tip rotation with respect to.

As is apparent from FIG. 8, when the non-constant speed transmission mechanism 48 is introduced, the front and rear width w of the hole formed by the planting claw 28 that has entered the rice field T is high because the speed of the planting process is high. The planted seedlings are not tilted greatly by the nail mark holes to disturb the posture or to fall down. On the other hand, when the non-constant speed transmission mechanism 48 is not introduced, the front and rear width w of the hole formed by the planting claw 28 that has entered the rice field T becomes large because the speed of the planting process is slow. There is a possibility that the seedling may be greatly inclined by the nail mark hole, disturbing the posture or falling down.

In the rotary type planting mechanism 18 that performs planting twice in one rotation, one of the planting claws 2 is used.
When the plant 8 is in the planting process, the other planting claw 28 is in the process of picking the seedling passing through the lower end of the seedling rest 16. Therefore, the speed of the descending process of the planting claw 28 and the rising process after the planting is also performed. It becomes faster, and quickly passes through the lower end of the seedling holder 16 to reliably cut out the seedlings.

Here, in the work transmission system for performing unequal-speed transmission, the rotational phase in which the planting clutch 49 can be turned on and off is limited to a certain phase range during one rotation. Therefore, there is no possibility that the operation phase in each part of the seedling planting apparatus 6 is changed.

When the seedling placing table 16 reaches the end of the horizontal feed stroke, the vertical seedling feed mechanism 21 operates. The timing is the same as the seedling removal process immediately before the end of the horizontal feed stroke and the next reverse direction. Between the first seedling removal process at the start of lateral feeding to In other words, the vertical feeding operation of the seedling vertical feeding mechanism 21 and the change of the horizontal movement direction of the seedling cradle 16 are executed in a low-speed phase in unequal speed transmission. Therefore, since the vertical feeding operation of the seedling vertical feeding mechanism 21 is performed at a low speed, a slip is less likely to occur between the seedling feeding belt 20 and the placed seedlings. Seedling stand 16
Is also performed in a low-speed phase, so that the lateral displacement due to the inertia of the placed seedling F is less likely to occur.

When planting is not performed, as shown in FIG. 9, the gear transmission 42 can be changed to standard specifications. In this case, the gear transmission section 42 provided outside the mission case of the inter-stock transmission mechanism 45 is provided with a shift gear G for gears G21 and G22 having the same outer diameter and slightly different numbers of teeth.
23 is selectively engaged with each other to perform a two-stage shift.
Multi-stage (six-stage) inter-gear shifting can be performed within the standard stock range.

[Other Embodiment] By changing the mounting phase of the pair of eccentric gears 56 and 57 constituting the unequal speed transmission mechanism 48 by 180 degrees with respect to the planting mechanism 18, the planting claw 2 is changed.
The speed of the descending process in which 8 takes out the seedlings from the seedling rest 16 and moves toward the rice field T, and the speed of the climbing process in which the planting claws 28 move from the rice surface T to the lower end of the seedling rest 16 are high,
The speed of the seedling removal process passing through the lower end of the seedling rest 16;
In addition, the speed of the planting process of planting the extracted seedlings on the rice field T can be reduced. In this way, when the speed of the planting mechanism is changed so as to increase the speed of the planting mechanism with respect to the moving speed of the airframe, and the dense planting is performed with the spacing between the plants smaller than the standard, the rush speed of the planting claws 28 with respect to the rice field T is moderate. It is possible to avoid that the seedlings separated from the planting claws 28 disturb the posture due to excessive momentum.

As the gears constituting the unequal speed transmission mechanism 48, besides using the eccentric gear having a circular outer periphery as described above, an elliptical gear or a non-circular gear whose pitch diameter changes with an arbitrary characteristic is used. It is also possible. Further, the unequal speed transmission mechanism 48 may be configured by using an eccentric crank mechanism.

The non-constant speed transmission mechanism 48 does not necessarily need to be provided in the transmission skill of the seedling planting device 6. For example, the non-constant speed transmission mechanism performs non-constant speed transmission in the chain transmission system in the seedling planting case 17, and It is also possible to drive at a non-uniform speed.

In the above embodiment, the planting mechanism 18 is of a rotary type in which two plants are planted by one rotation of the rotating case 27. However, a single cranking driven planting claw is used for each rotation. The present invention can be applied to a plant in which one plant is planted.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a side view of the seedling planting apparatus.

FIG. 3 is a sectional view of a mission.

FIG. 4 is a sectional view of a mission.

FIG. 5 is a sectional view of a planting case.

FIG. 6 is an explanatory view of an eccentric gear and a planting clutch.

FIG. 7 is an explanatory view showing characteristics of unequal speed transmission.

FIG. 8 is an explanatory view showing a locus of planting movement.

FIG. 9 is a cross-sectional view of the mission in a standard specification state.

[Explanation of symbols]

 Reference Signs List 15 feed case 16 seedling rest 18 planting mechanism 20 seedling rest horizontal feed mechanism 21 seedling vertical feed mechanism 28 planting claw 45 inter-stock transmission mechanism 48 unequal speed transmission mechanism 49 planting clutch 56 non-circular gear 57 non-circular gear P nail tip turning Motion trajectory T

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yusuke Kishioka 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Inside the Kubota Sakai Plant (72) Inventor Kenji Fujii 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house F-term (reference) 2B065 AA05 AA07 AC06 AC07 DA02 DA03 DA05 DA07 DA17 DA23

Claims (7)

[Claims] 1. A planting mechanism having a planting claw that circulates and rotates with a vertically long claw tip turning trajectory extending from a lower end of a seedling rest to a rice field surface, and a non-uniform speed transmission mechanism is provided in a transmission system to the planting mechanism. The planting claw is set so that the speed of the planting process of implanting the extracted seedlings on the rice field is faster than the speed of the descending process in which the planting claws remove the seedlings from the seedling mounting table and move toward the rice surface. And rice transplanter. 2. A planting mechanism having a planting claw that circulates and rotates with a vertically long claw tip turning locus extending from a lower end of a seedling placing stand to a rice field surface, and a non-constant speed transmission mechanism is provided in a transmission system to the planting mechanism. The speed of the seedling removal process that passes through the lower end of the seedling rest and the speed of the descending process in which the planting claw removes the seedling from the seedling rest and moves toward the rice field surface, and the extracted seedling is placed on the rice surface. A rice transplanter characterized in that the speed of the planting process for planting is set to be high. 3. The unequal-speed transmission mechanism is constituted by a pair of eccentric gears or non-circular gears that are engaged with each other, and the rotational phase of the eccentric gear or non-circular gear with respect to the planting mechanism can be changed. The rice transplanter according to claim 1. 4. A gear transmission unit having a serial transmission relationship with the inter-stock transmission mechanism is provided outside a transmission case having a built-in inter-stock transmission mechanism for changing the speed of the planting mechanism with respect to the body running speed in a plurality of stages. The pair of gears in the gear change portion is configured to be recombinable.
3. The rice transplanter according to any one of 3. 5. A planting clutch having a fixed position stop function is provided in a transmission system to the planting mechanism, and a clutch disengaging phase of the planting clutch is set to a rotation phase at which the planting mechanism operates at a minimum speed or a speed close thereto. The rice transplanter according to any one of claims 1 to 4, wherein 6. The rice transplanter according to claim 5, wherein the non-uniform speed transmission mechanism is provided on a transmission upper side of the planting clutch. 7. A seedling platform horizontal feed mechanism for moving the seedling platform reciprocally and horizontally with a constant stroke in a feed case, a seedling vertical transport mechanism for feeding a seedling placed on the seedling platform downward, and the planting mechanism. The rice transplanter according to any one of claims 1 to 6, further comprising a power transmission means, and the variable speed transmission mechanism is provided in a power transmission system to the feed case.