JP2007082451A5 - - Google Patents

Description

Rice transplanter seedling planting equipment

  The present invention relates to a seedling planting apparatus connected and supported at the rear part of a riding type rice transplanter, and more particularly to a seedling planting apparatus characterized by a planting case equipped with a planting mechanism at the rear part.

As a seedling planting device, for example, as disclosed in Patent Document 1, a feed case is connected to a horizontally long planting frame, and a front end portion of a planting case equipped with a planting mechanism at the rear is cantilevered to the planting frame. connected to Jo, transmits the horizontal axis the power taken from the feed case to an input shaft which is laterally placed on the front of the planting case, the planting drive shaft horizontally extends to a rear portion of the input shaft and the planting case, planting As shown in Patent Document 2, a case where the planting case is integrally formed through a transmission means in the case, or a long cylindrical shape before and after integrally molding the planting case, and the front part of the planting case is placed next to the feed case. A structure is known that is connected to the side end to transmit the lateral axis power from the feed case to the planting case.

  The structure in which a feed case and a planting case are connected to a horizontally long planting frame can constitute a seedling planting device with various numbers of planting lines by changing the number and arrangement of planting cases. In the device disclosed in Patent Document 1, the planting case has a left and right divided structure, and the front end of one of the divided case portions is connected to the planting frame. At the same time, the other divided case portion is joined to the divided case portion by bolting.

Japanese Patent Laid-Open No. 10-164920 Japanese Patent No. 2707727

  The planting case is filled or stored with lubricating oil to lubricate the internal transmission means, so it is necessary to provide a strict oil-tight seal on the planting case so that this lubricant does not leak into the paddy field. is there.

Disclosed in Patent Document 1, in the planting case of split structure, the entire periphery joints of the left and right split housing part is sealed portion, it will be bolted joining the outer periphery of the planting case with a small pitch, bolt Not only is the number of connecting points increased, but the assembly takes time, and the planting case weight increases due to the large number of bolts.

  In order to reduce the weight of the planting case and improve the assemblability, as shown in Patent Document 1, it is effective to integrally form the planting case in a long cylindrical shape at the front and back, but the planting case is mounted on the planting frame. In the structure to connect the planting case, the front opening end of the planting case integrally molded in a cylindrical shape is connected to and supported by the planting frame. Therefore, in order to seal the inside of the planting case, the connection part between the planting frame and the planting case Need to be provided with a seal structure. However, the connecting part between the planting frame and the planting case is a place where the weight load of the planting case and the planting reaction force from the planting mechanism are concentrated, and deformation and distortion occur at the joint and the sealing performance decreases. There is a fear.

  The present invention has been made paying attention to such points, and is intended to reduce the weight of the planting case, improve the assembly workability, and ensure high sealing performance. The main purpose.

A first invention is an input shaft in which a front end portion of a planting case equipped with a planting mechanism at a rear portion is connected to a horizontally long planting frame in a cantilever direction so that power from a traveling machine body is horizontally mounted on the front portion of the planting case. transmitted to, and planting drive shaft horizontally extends the input shaft and the rear of the planting case, the seedling planting apparatus rice transplanters which interlockingly connected through a transmission means in the planting case,
Together constituting a long cylindrical shape before and after integral molding the planting case, said is positioned between the front end of the planting case and the shaft support position of the input shaft, integrally a partition that partitions the inside of the planting case back and forth formed, characterized in that the rear open end of the planting case are configured to closed by a lid cover.

  According to the above configuration, the shaft portion of the input shaft and the planting drive shaft, which are installed horizontally before and after the planting case, is sealed with a seal ring or the like, and the rear opening end of the planting case is closed with the lid cover. The accommodated internal space can be sealed. And since the opening area of a rear opening end is small, it can seal reliably only by several bolting.

  The partition wall, which is the front wall of the transmission chamber that houses the transmission means, functions as a reinforcing rib, and the rigidity of the front end side of the planting case is high, and the connection strength of the planting case to the planting frame is high.

  Therefore, according to the first invention, it is possible to reduce the weight by integrally molding the planting case into a cylindrical shape, to improve the assembly workability, and to ensure high sealing performance.

According to a second invention, in the first invention,
The transmission means in the planting case, constituted by a chain transmission mechanism for decelerating driving said planting drive shaft, as well as constituting the upper side of the planting case linearly, the lower end side of the planting case, the planting drive shaft in which it is configured to different levels shape protruding to the lower side Te near smell.

In planting apparatus, the float supporting arms below the planting case is deployed vertically swingably around a front end, leveling float rear end portion of the float supporting arms are pivotally connected, the float support By swinging the arm and changing the relative height of the leveling float with respect to the planting case, the planting depth is adjusted by changing the height of the planting mechanism with respect to the paddy surface. In this case, a large space above and below is formed below the planting case in which the lower end side is formed in a stepped shape as described above except for the vicinity of the planting drive shaft. By swinging the float support arm up and down in this vertically high space, the pivot connection point of the leveling float can be repositioned up and down to ensure a large planting depth adjustment range.

According to a third invention, in the first or second invention,
Locking the said transmission means in the planting case constitute a chain transmission mechanism for driving decelerating the planting drive shaft, the front end of the strip-shaped chain tightener in the chain transmission mechanism, are integrally formed inside the planting case It is configured to be positioned and locked to the part.

According to the above configuration, the chain tighter is properly positioned and transmitted simply by inserting the chain tighter from the rear end opening of the planting case and locking the front end of the chain tighter to the locking part in the planting case. The chain can be applied to the chain, and the chain tighter can be easily assembled.

A fourth invention is the invention according to any one of the first to third inventions,
The lid cover is provided with a drain hole that is opened and closed by detaching a drain plug.

According to the above arrangement, when the planting case itself providing the drain hole, the strength of Oite planting case around the drain hole is reduced, it is possible to secure the strength of the planting case by providing the drain hole in the lid cover .

A fifth invention is the fourth invention, wherein:
The transmission means in the planting case is constituted by a chain transmission mechanism that drives the planting drive shaft at a reduced speed, and the rear end of a belt plate-like chain tightener in the chain transmission mechanism is supported by the tip of the drain plug. It is configured.

  According to the above configuration, a dedicated part for supporting the chain tighter is not necessary, which is effective in reducing the number of parts and reducing the weight.

A sixth invention is the invention according to any one of the first to fifth inventions,
On the outer periphery of the rear opening end of the planting case, a ridge that surrounds the cover cover over the entire periphery is provided.

  According to the above configuration, when a liquid sealant is applied to the joint surface between the rear opening end of the planting case and the lid cover and the lid cover is bolted and connected, the sealant that protrudes from the joint surface by tightening the bolt is removed. The lid cover is blocked by the ridge that surrounds the entire circumference and is prevented from flowing out to the outside, and the appearance is prevented from being damaged by the protruding sealant. In addition, the sealing performance is improved by solidifying the stored sealant that is blocked by the ridges.

  FIG. 1 shows a side view of a seedling planting apparatus 1 connected to the rear part of the riding rice transplanter, and FIG. 2 shows a plan view of the main part thereof. This seedling planting device 1 is configured to have a six-row planting specification, and is connected to the lower part of the rear end of the lifting link mechanism 2 provided in the traveling machine body on the left side of the figure in a freely rolling manner. 6 seedling seedling stands 3 that are moved back and forth with a fixed stroke and cut out seedlings one by one from the lower end of this seedling resting base 3 and planted on the rice field T. The planting mechanism 4 and three leveling floats 5 arranged in parallel so as to level the planting locations of the surface T every two strips are provided.

  At the front lower part of the seedling planting device 1, there is provided a right and left square tubular planting frame 6 formed by extruding aluminum material, and this planting frame 6 is connected to the lower part of the rear end of the lifting link mechanism 2 so as to be able to roll. Has been. A feed case 7 that receives power from the traveling machine body is connected to the left and right intermediate portions of the planting frame 6, and three planting cases 8 are connected rearward and cantilevered near the left and right central portions and both left and right ends of the planting frame 6. Has been. A planting drive shaft 9 is penetrating and traversing the rear portion of each planting case 8, and two sets of the planting mechanisms 4 are mounted on the left and right ends of each planting drive shaft 9.

  The planting mechanism 4 includes a rotary case 10 that is connected and fixed to the end of the planting drive shaft 9 and rotates integrally around the axis p of the planting drive shaft 9, and a horizontal axis that extends laterally outside both ends of the rotary case 10. A claw case 11 pivotally supported around the center q is provided, and each claw case 11 is provided with a planting claw 12 and a seedling pusher 13.

Although the detailed description of the structure is omitted, the claw case 11 rotates in conjunction with the rotation of the rotating case 10 at a constant speed in the forward rotation direction (counterclockwise in FIG. 1) by the planting drive shaft 9. A non-illustrated infinite speed gear transmission mechanism (not shown) built in the case 10 rotates one revolution in the opposite direction at an infinite speed, whereby the planting claw 12 is vertically long across the seedling take-out port at the lower end of the seedling bed 3 and the rice field. The tip rotation trajectory S is drawn and circulated. When the planting claw 12 brings the seedling cut out and held from the lower end of the seedling table 3 into the field surface T , the seedling pushing tool 13 protrudes toward the toe side, separates the held seedling from the planting claw 12 and pushes it into the ground. It is configured to

  A float fulcrum shaft 15 is horizontally and horizontally disposed below the front portion of the planting case 8 and supported by brackets 6a provided at both ends of the planting frame 6. The float fulcrum shaft 15 projects rearward from the float fulcrum shaft 15. Further, the leveling float 5 is connected and supported at the rear ends of the three sets of float support arms 16 so as to be swingable up and down around the fulcrum a.

  The feed case 7 is axially transmitted with working power extracted from the left-side traveling machine body, and the seedling table 3 is laterally driven by the power transmitted to the feed case 7, and the stroke end thereof is also transmitted. Each time, the seedling feed belt 17 provided on the seedling bed 3 is driven by a constant pitch. The horizontal shaft power taken out from the rear portion of the feed case 7 is transmitted to the input shaft 20 that is horizontally supported at the front portion of each planting case 8.

  The planting case 8 is integrally formed in a long cylindrical shape by aluminum die casting, and its detailed structure will be described with reference to FIGS.

  The input shaft 20 passes through and is supported by a boss 8a provided at the front of the planting case 8, and the planting drive shaft 9 passes through the boss 8b provided at the rear of the planting case 8. The bearing shaft is horizontally supported and the input shaft 20 and the planting drive shaft 9 are interlocked and connected by a chain transmission mechanism 21.

  The chain transmission mechanism 21 is provided with a drive sprocket 22 attached to the input shaft 20, a driven sprocket 23 attached to the planting drive shaft 9, a transmission chain 24 wound around them, and slackness of the transmission chain 24. Absorbing chain tighters 25 and the like are provided. The driven sprocket 23 is set to a pitch diameter twice that of the drive sprocket 22 so that the planting drive shaft 9 is driven to decelerate at a rotational speed that is half that of the input shaft 20.

  The drive sprocket 22 is loosely supported by the input shaft 20 and is linked to the input shaft 20 via a torque limiter 26. The torque limiter 26 includes a clutch member 27 that is spline-mounted on the input shaft 20, a torque spring 28 that slidably biases the clutch member 27 toward the drive sprocket 22, and a facing portion of the clutch member 27 and the drive sprocket 22. It is comprised by the cam engaging part 29 etc. which were provided in. Normally, the spring-biased clutch member 27 is integrated with the drive sprocket 22 by the engagement of the cam engaging portion 29, and the rotational power of the input 20 is transmitted to the drive sprocket 22 via the clutch member 27. When the load torque acting on the drive sprocket 22 becomes larger than the set torque regulated as the spring pressure of the torque spring 28, the cam engagement portion 29 rides up and the clutch member 27 is displaced backward against the torque spring 28. Further, the transmission of power from the clutch portion 27 to the drive sprocket 22 is interrupted, and an excessive load torque is prevented from acting on the planting mechanism drive system.

When assembling the chain transmission mechanism 21, as shown in FIG. 6, the lower end loop of the transmission chain 24 suspended in the planting case 8 with the planting case 8 in a standing posture with its front end facing downward. Next, the drive sprocket 22 is supported, and then a shaft assembly assembling the input shaft 20 with the clutch member 27 of the torque limiter 26, the torque spring 28, and the spring receiving washer 30 is inserted from the boss 8a on the large diameter side. Thereafter, the bearing 31, oil seal 32, bearing seal cover 33, etc. are mounted on the left and right boss portions 8a to support the input shaft 20 in a sealed state.

  The driven sprocket 23 is loosely supported by the planting drive shaft 9 and is linked to the planting drive shaft 9 via a saddle clutch 35. The hook clutch 35 stops the operation of the planting mechanism 4 for each planting case 8 in units of two strips, and is used when planting with fewer than all planting strips near the coast. The saddle clutch 35 includes a clutch member 36 that is spline-mounted on the planting drive shaft 9, a spring 37 that slides the clutch member 36 toward the driven sprocket 23, and the clutch member 36 and the driven sprocket 23. In the normal planting operation state, the spring-biased clutch member 36 is integrated with the driven sprocket 23 via the nail biting portion 38. Rotational power transmitted to the driven sprocket 23 via the chain transmission mechanism 21 is transmitted to the planting drive shaft 9 via the clutch member 36. By disengaging the clutch member 36 against the spring 37 and releasing the engagement at the claw engagement portion 38, power transmission from the driven sprocket 23 to the planting drive shaft 9 is interrupted, and the planting drive shaft 9 is driven. The planting mechanism 4 is stopped.

  As shown in FIG. 8, the peripheral portion of the clutch member 36 in the saddle clutch 35 is provided with a climbing inclination cam 36 a facing in the axial direction, and a clutch operation pin 39 that is inserted through the planting case 8 from the front. Is inserted into the rotation trajectory of the climbing inclination cam 36a of the clutch member 36 rotating at the clutch engagement position, the cam action is caused by the relative rotation of the clutch operating pin 39 and the climbing inclination cam 36a at a fixed position. Thus, the clutch member 36 is forcibly shifted in the clutch disengagement direction against the spring 37, and the planting drive shaft 9 is stopped at a predetermined rotational phase.

The rotation phase at which the planting drive shaft 9 is stopped by the clutch disengagement operation of the saddle clutch 35 is set corresponding to a position where each of the pair of planting claws 12 provided at both ends of the rotating case 10 does not enter the surface T. Yes. The rotation phase at which the clutch member 36 and the driven sprocket 23 are engaged is also set to a constant position in the rotation direction, and the planting drive shaft 9 is kept at a constant rotation phase even if the clutch engagement operation for extracting the clutch operation pin 39 is performed. fairly first time will be the claw engaging portion 38 bite in the Zenjo planted state furrow when clutch 35 is placed all the planting case 8, so that the whole of the planting only mechanism 4 is planted operate at the same time ing.

  The clutch operating pin 39 is engaged and interlocked with one end of a clutch operating arm 40 pivotally connected to the upper portion of the planting case 8 so as to be swingable around a lateral fulcrum b, and the clutch operating arm 40 is mounted on the fulcrum b. The torsion spring 41 is urged to swing in the pin pull-out direction (clutch engagement direction). An elastic arm 43 using a torsion spring is attached to the clutch operation arm 40, and the inner end of the operation wire 42 operated from the machine operating unit is connected to the end of the elastic arm 43. By pulling the operating wire 42 and swinging the clutch operating arm 40 against the torsion spring 41, the clutch operating pin 39 is rushed in and the closing clutch 35 is cut off. Depending on the timing at which the operation wire 42 is pulled, the clutch operation pin 39 may not come into contact with the outer peripheral surface of the climbing cam 36a and enter the rotation trajectory of the climbing cam 36a. The torsional deformation of the elastic arm 43 when the elastic member 43 is twisted to absorb the wire stroke and the clutch member 36 is rotated to a rotational phase at which the clutch operating pin 39 can enter into the turning locus of the climbing cam 36a. The clutch operating arm 40 is swung by the restoring force, and the clutch operating pin 39 is operated to enter.

  As shown in FIG. 4, the lower path of the transmission chain 24 in the chain transmission mechanism 21 housed in the planting case 8 is a slack side path. The chain tighter 25 acting on the slack side path is made of a strip-shaped leaf spring material, and is curved upward so as to be pressed by the transmission chain 24 from below.

The planting case 8 is integrally molded in a long cylindrical shape with front and rear ends opened by aluminum die casting, and the case front end portion 8c serving as a connecting portion to the planting frame 6 and the shaft support portion of the input shaft 20 are formed. A partition wall 8d that is positioned in between and partitions the planting case 8 forward and backward is integrally formed. The partition 8 d is formed in a partial arc shape close to the transmission chain 24 wound around the drive sprocket 22, and the rear space of the partition 8 d is a transmission space R that houses the chain transmission mechanism 21. .

  The case front end portion 8c of the planting case 8 is formed in a hollow structure opened forward, and ribs 8e connected to the upper and lower wall surfaces and the partition wall 8d are formed to increase bending rigidity in the vertical and horizontal directions. . This case front end portion 8c has a height substantially equal to the height of the planting frame 6, is formed in a front spreading shape having a large lateral width, and is stably contacted with a large lateral width on the rear surface of the planting frame 6, It is firmly fixed to the planting frame 6 by through bolts 45 at the top, bottom, left and right. A protrusion 8f projecting forward is integrally formed at the left and right central portion of the upper end side of the case front end portion 8c. By engaging the protrusion 8f with the upper surface of the planting frame 6, the planting case 8 is positioned with respect to the planting frame 6. In addition, the load is supported.

  A lid cover 46 having a sheet metal press structure is joined to the rear opening end 8g of the planting case 8, and is fastened and fixed by upper, lower, left, and right bolts 47, and the rear end of the transmission space R that houses the chain transmission mechanism 21 is closed. Yes. The chain transmission mechanism 21 is oil bath lubricated by the lubricating oil stored in the transmission space R. The chain transmission mechanism 21 is replenished with lubricating oil from an oil injection hole c provided in the upper part of the cover cover 46 and provided in the lower part of the cover cover 46. If it is, oil can be discharged from the drain hole d. The oil supply hole c is opened / closed by attaching / detaching the resin cap 48, and the drain hole d is opened / closed by attaching / detaching the drain plug 49.

  On the outer periphery of the rear opening end 8g of the planting case 8, a ridge 50 that surrounds the cover cover 46 over the entire periphery is formed. When a liquid sealant is applied to the joint surface between the rear opening end 8g of the planting case 8 and the lid cover 46 and the lid cover 46 is bolted and connected, the sealant protruding from the joint surface by tightening the bolt 47 is removed. It is prevented from being blocked by the protrusion 50 and flowing out to the outside, and the appearance is prevented from being damaged by the protruding sealant. Moreover, the sealing performance of the joint portion is enhanced by solidifying the stored sealing agent that is blocked by the ridges 50.

  As shown in FIGS. 3 and 4, the upper end side of the planting case 8 is configured in a straight line, whereas the bottom wall of the planting case 8 is formed in three steps that are lower toward the rear side. When the transmission space R is molded, the inner mold is easily rearwardly expanded.

  The front step e formed on the step-shaped bottom wall is small, and a groove-like locking portion 51 opened rearward is formed here. By inserting the front end of the chain tighter 25 into the locking portion 51, it is possible to prevent the forward displacement of the chain tighter 25. The rear end of the chain tighter 25 is bent into a bowl shape, and the rear end is pressed against the front by the drain plug 49, so that the chain tighter 25 is pressed against the transmission chain 24 from below in a mountain-shaped bent state. It is like that.

  The rear portion of the planting case 8 needs a large vertical width to accommodate the large-diameter driven sprocket 23, the rear step f formed on the stepped bottom wall is large, and the lower end side of the planting case 8 is In the vicinity of the planting drive shaft 9, it has a stepped shape protruding greatly downward. In front of such a large step f, a high space is formed below the planting case 8, and the rear end of the float support arm 16, that is, the fulcrum a of the leveling float 5 has a large step f. By arranging to be positioned forward, the position of the fulcrum a of the leveling float 5 can be greatly changed up and down to ensure a large planting depth adjustment range.

The planting case 8 functions not only as a transmission case to drive supports the planting mechanism 4 has also a function as a supporting frame for supporting the other mechanisms and devices will be described in its structure below .

  A semicircular recess 61 is integrally formed below the front portion of each planting case 8, and the float fulcrum shaft 15 is rotatably inserted into the recess 52 of each planting case 8 from below.

  A slide bracket 62 for supporting the seedling bed 3 so as to be movable up and down along the inclination direction is bolted to the upper lateral side of each planting case 8 in the middle of the front and rear, and an operating arm for up and down movement. A fulcrum stand 65 for engaging and holding 63 fulcrum shafts 64 is integrally formed on the upper surface of the planting case 8. The bottom of the seedling table 3 is supported by a horizontally long slide rail 66 so as to be slidable in the left-right direction, and the rear surface of the seedling table 3 is placed on top of a pair of left and right supports 67 erected from the planting frame 6. The upper part is received and supported so as to be slidable left and right and movable up and down along the seedling table tilt direction. Then, slide rods 69 projecting from the pair of left and right support fittings 68 connected to the slide rail 66 along the seedling stand tilt direction are respectively supported by the slide brackets 62 of the planting case 8 on the left and right sides. The sliding rail 66 is slid up and down integrally with the slide rod 69 so that the entire seedling bed 3 is displaced in the tilt direction.

  The distal end of the operation arm 63 is engaged with a support fitting 68 of the slide rail 66, and the fulcrum shaft 64 is rotated and adjusted by an unillustrated seedling amount adjusting lever to be fixed and held at an arbitrary position. The seedling stage 3 is moved in the inclination direction, and the overlap margin between the tip rotation trajectory S of the planting claw 12 and the lower end part of the seedling stage changes so that the amount of seedling is changed. It is.

A discarding boss 70 is provided at the upper half of each planting case 8. In the specification for mounting an implement (not shown) such as a fertilizer application device or a chemical spraying device, the discarding boss 70 is used to implement the discarding boss 70. A support frame (not shown) can be bolted.

  [Other Examples]

  (1) As shown in FIG. 9, an eccentric cam 71 that supports the chain tighter 25 from below is attached to the side surface of the planting case 8 via a support shaft 72 so as to be adjustable, and the eccentric cam 71 is appropriately rotated. By adjusting to the moving position and fixing with the double nut 73, it is possible to perform a suitable tension adjustment corresponding to the extension of the transmission chain 24.

  (2) As shown in FIG. 10, the support arm 74 that receives the chain tighter 25 from below is attached to the side surface of the planting case 8 through the adjustment knob 75 with a scale so that the swinging adjustment is possible. The tension can be adjusted with little variation.

  (3) In the above-described embodiment, the chain transmission mechanism 21 is used as a transmission means for interlockingly connecting the input shaft 20 and the planting drive shaft 9 that are installed horizontally before and after the planting case 8, but a bevel gear (not shown). It is also possible to interlock and connect via a transmission shaft (not shown) installed along the planting case 8.

  (4) As the planting mechanism 4 driven by the planting drive shaft 9, as described above, in addition to the rotary type that performs planting twice by one rotation of the planting drive shaft 9, 1 is achieved by one rotation of the planting drive shaft 9. You can also use a crank type planting plant.

Side view of seedling planting device Plan view of main parts of seedling planting device Side view of planting case Vertical side view of planting case Transverse plan view of planting case Illustration of assembly process Rear end view of planting case Longitudinal rear view showing the operating structure of the saddle clutch Longitudinal side view (b) and longitudinal front view (b) showing another embodiment of chain tension structure Side view showing still another embodiment of chain tension structure

Explanation of symbols

4 Planting mechanism
6 Planting frame
8 Planting cases
8c Front end 8d Bulkhead 8g Rear opening 9 Planting drive shaft 20 Input shaft 21 Chain transmission mechanism 25 Chain tighter 46 Lid cover 49 Drain plug 50 Projection 51 Locking portion d Drain hole

Claims (6)

The front end of the planting case equipped with a planting mechanism at the rear is connected to a horizontally long planting frame in a cantilevered manner, and the power from the traveling machine is transmitted to the input shaft that is installed horizontally on the front of the planting case. and planting drive shaft horizontally extends the shaft and the rear portion of the planting case, the seedling planting apparatus rice transplanters which interlockingly connected through a transmission means in the planting case,
Together constituting a long cylindrical shape before and after integral molding the planting case, said is positioned between the front end of the planting case and the shaft support position of the input shaft, integrally a partition that partitions the inside of the planting case back and forth formed, seedling planting apparatus rice transplanter, characterized in that are configured to closed by a lid covering the rear opening end of the planting case. The transmission means in the planting case, constituted by a chain transmission mechanism for decelerating driving said planting drive shaft, as well as constituting the upper side of the planting case linearly, the lower end side of the planting case, the planting drive shaft planting devices planting machine according to claim 1, wherein are configured to different levels shape protruding to the lower side Te near smell. Engagement of said transmission means in the planting case, the planting drive shaft constituted by a chain transmission mechanism for drive reduction, the front end of the strip-shaped chain tightener in the chain transmission mechanism, are integrally formed inside the planting case The seedling planting device of the rice transplanter according to claim 1 or 2, wherein the seedling planting device is configured to be positioned and locked to the stopper.   The seedling planting apparatus of the rice transplanter as described in any one of Claims 1-3 in which the drain hole opened and closed by attachment or detachment of the drain plug is provided in the said cover cover. The transmission means in the planting case is constituted by a chain transmission mechanism that drives the planting drive shaft at a reduced speed, and the rear end of a belt plate-like chain tightener in the chain transmission mechanism is supported by the tip of the drain plug. The seedling planting apparatus of the rice transplanter of Claim 4 comprised.   The seedling planting apparatus of the rice transplanter as described in any one of Claims 1-5 provided with the protrusion which encloses the said cover cover over the perimeter on the outer periphery of the rear part opening end in the said planting case.