1316388 玫、發明說明 【發明所屬之技術領域】 本發明係有關於插秧機等移植機。 【先前技術】 習知以來’具備了將秧苗插於苗圃之插秧部、及被旋 轉驅動後以翻耕整平（翻土）苗圃之翻土滾輪，並將該翻土 滾輪橫設於插秧部的前方之插秧作業機係爲眾所皆知的， 將該插秧作業機連結於行進機體上，但不是預先進行翻 土 ’而是在翻土的同時，進行插秧作業之翻土同步移植機 係爲眾所皆知的（例如參照日本特許文獻1)。 〔日本特許文獻1〕日本特許第3075661號公報。 【發明內容】 發明揭示 發明欲解決之課題 然而一般而言，會與插秧作業分開，而預先進行翻土 作業，其後再利用插秧機等進行插秧作業爲大多數農家之 作業程序，在該情況下，於插秧作業時，會造成由於行進 機體的車輪而輾踏苗圃的情形，因此期望有可以整平苗圃 表層之簡單的裝置。 爲解決課題之手段 爲了解決上述課題之本發明的移植機，其第1特徵 -5- 1316388 爲：具備了被連結於行進機體3，且將秧苗插入苗圃之插 秧部12，並於插秧部12前方，設置了：具備對苗圃表層 進行翻土的複數的整地構件3 7，進行苗圃表層的整地作 業之筐型的整地滾輪1 3，整地滾輪1 3的各整地構件之行 進軌跡α、與相對於該整地構件37a的旋轉方向的前1個 整地構件37b之行進軌跡β，由側面看來在苗圃表面附近 交叉，將整地滾輪13連動於行進機體3之行進速度後加 以驅動。 又本發明之第2特徵爲：具備了被連結於行進機體3 且將秧苗插入苗圃之插秧部12，並於插秧部12前方，設 置了對苗圃表層進行整地作業之整地滾輪13，整地滾輪 13係藉由安裝成一體地旋轉於滾輪軸14，且由隔著滾輪 軸1 4呈對稱地被分割之分割片3 6的組合來構成的，其全 體在側面視角呈筐型，各分割片3 6是由：伴隨旋轉來對 苗圃表層進行翻土的複數的整地構件37、及將該整地構 件3 7在左右兩側予以連結的連結構件3 8所構成，該分割 片3 6分別是將整地構件3 7與連結構件3 8 一體成形。 發明效果 當根據如上述所構成之本發明的構造時，因爲藉由整 地 '滾輪’可以進行苗圃表層之整地作業，因此在翻土後的 苗圃上進行插秧作業之情況下，藉由上述整地滾輪，可以 1 +行S機體的車輪跡等，可以使穩定的插秧作業達到順 手(J €行的效果。接著由於該整地滾輪係僅只整平比所謂從 ® Η表面到插秧深度之習知的翻土插秧機更淺的苗圃極表 J1側即可’因此整地滾輪的驅動力比較小，再者也由於整 %滾輪自身不須要大的強度，因此可以利用樹脂等比較輕 -6- 1316388 量的材質加以構成。 因整地滾輪1 3係藉由安裝成一體地旋轉於滾輪軸 1 4，且隔著滾輪軸1 4呈對稱地被分割之分割片3 6的組合 來構成的，其全體在側面視角呈筐型，各分割片3 6是由 伴隨旋轉來對苗圃表層進行翻土的複數的整地構件37、 及將該整地構件3 7在左右兩側予以連結的連結構件3 8所 構成，分割片3 6分別是將整地構件3 7與連結構件3 8 — 體成形，所以能將整地滾輪1 3作成輕量化且簡單的構 造。 又藉由讓各整地構件之各整地構件之行進軌跡，其預 定的整地構件、與對於該整地構件而言爲旋轉方向的前1 個整地構件之行進軌跡，由側面看來在苗圃表面附近交叉 的狀態，將整地滾輪連動於行進機體之行進速度加以驅 動，隨著行進機體的速度變化以變更整地滾輪的驅動速 度’使利用各整地構件之整地作業（苗圃翻土作業）係在比 苗圃表面更內部處大致上不會重複翻耕，由於沒有在翻土 後的苗圃上進行必要以上的翻耕，因此可以達到防止由於 過度翻耕所造成的秧苗生育等惡化的效果。 【實施方式】 實施發明之最佳形態 其次，根據圖面加以說明本發明之第1實施形態。第 1.圖係爲具備本發明之整地滾輪的移植機，也就是搭乘用 插秧機的側面圖，該搭乘用插秧機係與習知相同，在被支 撐於前後輪1’ 2上之行進機體3的後方，使插秧作業機 4藉由升降桿6而可以自由升降，且成爲可自由滾壓連結 的構造。 1316388 在上述插秧作業機4之秧苗置放台7的正面（內面）側 上，如第1圖、第2圖所不’_設置了縱方向之縱框架8、 及被一體固定於該縱框架8上’且在縱框架8下方於左右 方向橫設之橫框架9。再者在上述橫框架9側，安裝了多 個播種殼體11，並於該播種殼體11上設置了秧苗插狭用 之播種爪12。 又在播種殻體11的下方，於左右方向設置了多個浮 子10，本搭乘用插秧機係藉由將浮子10接觸苗圃表面而 降下插秧作業機4，一邊使行進機體3行進的同時，一邊 旋轉驅動播種爪12，使播種爪12撥取秧苗置放台7上的 秧苗後，插入於苗圃中。又由於該搭乘用插秧機不是翻土 同步移植機，因此是在翻土後的苗圃上進行秧苗的插秧作 業。 再者，在插狹作業機4側，於播種爪12的前方且爲 後輪2的後方，就是於播種爪12與後輪2中間的位置， 將約略涵蓋插秧作業機4整個寬幅之多個整地滾輪13可 自由旋轉驅動地軸支設置於支點軸（滾輪軸）14上，藉由將 該整地滾輪1 3插入苗圃內再加以旋轉驅動後，可以於上 述插秧作業時，對於因爲行進機體3之旋轉等所輾踏之翻 土後的苗圃、枕地等進行整地，因此可以在整地後的苗圃 上進行插秩。 其次針對上述整地滾輪1 3的支撐構造加以說明。在 上述兩縱框架8的上方側之間，使左右方向之軸1 6可自 由轉動地被軸支，並於該軸1 6的左右兩側上，使上臂i 7 -8- 1316388 被突出設置。又在左右各縱框架8的下方側上，使下臂 20可自由搖動地被軸支。 再者，在左右各上臂17的前端側與左右各下臂20的 前端側之間，各自使縱臂18被軸支，並於左右各縱臂18 的下端側之間，介有滾輪軸1 4而使多個整地滾輪1 3於左 右方向被軸支。又整地滾輪13係藉由被設置在左右方向 之約略中央位置的齒輪殼體1 5之驅動力加以旋轉驅動。 此時在軸1 6上突出設置了控制桿2 3，該控制桿2 3 係被貫穿固定於縱框架8上之控制桿導引部24。如此一 來，當藉由控制桿23的搖動而轉動軸16時，介由上臂 17、縱臂18’升降整地滾輪13而可以調整高度，並藉由 將控制桿23卡止於任何一個被設置在控制桿導引部24上 端及下方側之多個段差部，使整地滾輪1 3的高度係可以 階段性地定位調整。 上述各整地滾輪13如第3(a)圖、第3(b)圖所示，挾 持滾輪軸1 4而被對稱分割爲2，並藉由2個相同形狀的 分割片3 6、3 6加以組合構成，使整體在側面看來成爲正 6角形之筐型。再者各分割片36係由隨著旋轉而翻耕苗 圃表面之多個板狀的整地構件37、及在左右兩側連結該 整地構件37之連結構件38所構成。又兩分割片36中之 各整地構件3 7與連結構件3 8係利用樹脂一體成形。 再者在連結構件38之挾持滾輪軸14的兩側上，係使 爲了安裝固定2分割片36之螺检42的螺栓座43、及爲 了收納螺帽44之螺帽孔46被形成。又各連結構件3 8 1316388 上，形成爲了貫穿滾輪軸14之半圓形的切口部。 藉此，使一方分割片36之螺栓座43與另一方分割片 36之螺帽孔46相對向，而且利用切口部挾持滾輪軸14， 將兩分割片3 6從滾輪軸1 4的周面側加以安裝，此時再插 入與滾輪軸14垂直交叉的栓部49，並將該栓部49之兩 端插入各分割片3 6側內，藉由利用螺栓42及螺帽44固 定兩分割片3 6，使整地用滾輪1 3係與滾輪軸1 4 一倂旋 ，轉地加以安裝。又藉由解除根據螺栓42及螺帽44的固 定，可以從滾輪軸1 4周面側拆下兩分割片3 6 (分解整地 用滾輪1 3 )。 一方面，上述整地滾輪13係如前述所示，可以藉由 控制桿23進行高度的調整，當其係由浮子10的上方朝較 浮子10下面更下方突出時，可以插入來自於浮子10之突 出量部分苗圃內，而進行整地作業。但是該整地滾輪13 的高度係使整地滾輪1 3插入苗圃的最深深度可以調整在 )未達（較插秧深度Z更表面側）插秧深度Z的範圍（參照第4 圖），藉此使整地滾輪1 3係僅只整平比苗圃之插秧深度z 更淺的表層部分Y(參照第4圖）。又本實施形態中之整地 滾輪13係可以使由浮子10下面的突出量調整在大致爲 10〜40mm之範圍’因此可以進行比上述插秧作業時之插 秧深度Z更淺的表層部分Y之整地。 藉此，配合插秧深度（習知同樣可以變更），可以調整 整地滾輪13的高度，並藉由將整地滾輪13插入苗圃後再 加以旋轉驅動’使整地滾輪13僅只整平苗圃之比插秧深 -10- 1316388 度z更淺的表層部分Y’因此可以對如前述所示之在插狭 作業時由於行進機體3之旋轉等而藉由行進機體3的車輪 跡等所輾踏之翻土後的苗圃、枕地等進行整地’對於整地 後的苗圃，可以使穩定的插秧作業順利進行。 一方面，當使翻土的苗圃再次翻土或進行與翻土相同 程度的整地時，苗圃面會造成過度翻耕的狀態，，而發生 秧苗的生育惡化等不好的情況係爲眾所皆知的。再者本整 地滾輪1 3係使用於在翻土後的苗圃上進行插秧作業的時 候，因此藉由使用本整地滾輪1 3，可以防止過度翻耕， 如第4圖所示，各整地構件37之行進軌跡係使既定的整 地構件37a之行進軌跡α與對於該整地構件37a而言爲旋 轉方向的前1個整地構件37b之行進軌跡0，由側面看來 在苗圃表面附近的A部分交叉，以設定旋轉速度。又第4 圖係以1 6階段之時間系列性來顯示隨著行進機體3之行 進的2個整地構件37a、37b的位置。 又如第1圖所示’整地滾輪1 3用之齒輪殼體1 5係從 後輪2之傳動部2 5的驅動力加以傳動，因此當變更行進 速度時，會隨著行進速度而變更整地滾輪13的旋轉速 度’即使在變更行進速度之情況下，通常也會如上述所 示，使既定的整地構件37a之行進軌跡^與對於該整地構 件37a而言爲旋轉方向的前1個整地構件37b之行進軌跡 Θ ’由側面看來在苗圃表面附近交叉。 如此一來，整地浪輪1 3之根據各整地構件3 7之整地 作業（翻耕苗圃作業）係無論怎樣的行進速度，只會在苗圃 -11 - 1316388 表面重複翻土，比田圃表面更內部處幾乎沒有重複翻土。 換言之，於苗圃表面上以不會發生漏耕的狀態進行全面性 的整地，而在苗圃內部則是以會發生漏耕的狀態進行粗略 的整地作業。 如此一來，由於沒有在翻土後的苗圃上進行必要以上 的翻耕，因而可以防止由於過度翻耕而造成之狭苗生育惡 化等，而且由於在苗圃表面係以不會發生漏耕的狀態，約 :略涵蓋插秧作業機3的整個寬幅下進行整地，藉由將翻土 後掉落在苗圃'上的雜草種子或雜草耕入土中，而可以達到 除草效果。再者由於整地作業係未達插秧深度Z，因此不 會造成秧苗之根部分的土壤過於鬆軟，因此可以穩固秧苗 的姿勢，而使秧苗直立，減少秧苗的傾斜。 又藉由將整地滚輪1 3的旋轉速度連動於行進機體3 的行進速度，可以將苗圃表面之泥土或泥水利用一定速度 朝後方移動，因此可以防止在浮子1 0前方之泥土或泥水 )的積存、或是在整地滾輪13前方之泥土或泥水積存，也 可以防止由於泥土或泥水所造成的插秧不良。爲此，整地 滾輪13之旋轉速度係對於行進機體3之車速而言爲1.5〜 2.5倍，換言之對於行進速度爲im/s而言則被設定在1 .5 〜2·5 m/s 。 再者上述整地滾輪13係如前述所示，由於僅只整平 苗圃的極表層側，因此使整地滾輪1 3之驅動力比較小， 爲此，可以從如前述所示之其他傳動部（本實施形態中爲 後輪2之驅動用的傳動部2 5)的驅動力分散取得，因此可 -12- 1316388 以簡單地構成整地滾輪13之驅動機構。 又由於整地部分係如前述所示爲苗圃之極淺表層’而 且整地滾輪1 3自身係不須大的強度，因此如本實施形態 所示，可以利用樹脂或樹脂等比較輕量的材質加以形成’ 可以使整地滾輪1 3之構造簡單化，而且由於輕量’使驅 動力變得更小。 【圖式簡單說明】 第1圖係爲搭乘用插秧機之側面圖。 第2圖係爲整地滾輪部分之主要部分正面圖。 第3圖中（a)爲整地滾輪之側面圖，（b)爲分割片之正 面圖。 第4圖係爲以1 6階段之時間系列性來顯示2個整地 構件之位置的側面槪略圖。 符號說明 3行進機體 12播種爪（插秧部） 1 3整地滾輪 3 7整地構件 3 7a整地構件 3 7b整地構件 3 8連結構件 Z插秧深度 -13- 1316388 α 整地構件之行進軌跡 β 整地構件之行進軌跡 -141316388 玫,发明发明 [Technical Field] The present invention relates to a transplanter such as a rice transplanter. [Prior Art] Since the prior art, the seedlings have been inserted into the transplanting part of the nursery, and the turning wheel has been rotated to drive the flattening (turning) nursery, and the turning roller is placed horizontally in the transplanting part. The front of the transplanting machine is well-known, the transplanting machine is connected to the traveling body, but it is not the pre-turning of the soil, but the soil-transplanting synchronous transplanting machine that performs the transplanting operation while turning the soil It is well known (for example, refer to Japanese Patent Document 1). [Japanese Patent Literature 1] Japanese Patent No. 3076061. SUMMARY OF THE INVENTION The present invention discloses a problem to be solved by the invention. However, in general, it is separated from the transplanting operation, and the soil-turning operation is performed in advance, and then the rice transplanting machine or the like is used for the transplanting operation, which is the operation procedure of most farms. In the case of the transplanting operation, the nursery is caused by the wheels of the traveling body, and therefore it is desirable to have a simple device that can level the surface of the nursery. Means for Solving the Problem In order to solve the above-described problems, the first feature of the transplanting machine of the present invention is that the insertion mechanism 12 is connected to the traveling body 3, and the seedlings are inserted into the nursery, and the insertion portion 12 is inserted into the transplanting portion 12. In the front, there are provided a plurality of grading members 3 7 for cultivating the surface of the nursery, a basket-type grading roller 13 for the grading of the surface of the nursery, and a trajectory α and a relative of the grading members of the grading roller 13 The traveling trajectory β of the former grading member 37b in the rotation direction of the grading member 37a crosses the vicinity of the nursery surface from the side, and drives the grading roller 13 to the traveling speed of the traveling body 3, and drives it. Further, according to a second aspect of the present invention, the insertion portion 12 that is coupled to the traveling body 3 and inserts the seedling into the nursery is provided, and the grounding roller 13 for the surface preparation of the nursery surface is provided in front of the insertion portion 12, and the grounding roller 13 is provided. It is constituted by a combination of the divided pieces 36 which are integrally rotated by the roller shaft 14 and which are symmetrically divided by the roller shaft 14 , and the whole is in a basket shape in the side view, and each divided piece 3 6 is composed of a plurality of grading members 37 for tumbling the surface of the nursery with rotation, and a connecting member 38 for connecting the grading members 37 to the left and right sides, and the divided pieces 36 are respectively The member 3 7 is integrally formed with the joint member 38. Advantageous Effects of Invention According to the configuration of the present invention constructed as described above, since the soil preparation of the nursery surface layer can be performed by the soil preparation 'roller', the above-mentioned ground preparation roller is used in the case of performing the transplanting operation on the nursery after the soiling It can make 1 + row of the wheel traces of the S body, etc., so that the stable transplanting operation can be achieved smoothly (J € line effect. Then, since the grounding roller system is only leveling, it is only known from the surface of the Η to the depth of the insertion. The shallower seedlings of the soil transplanter can be used on the side of the J1 side. Therefore, the driving force of the grounding roller is relatively small. In addition, since the whole roller does not require a large strength, it can be used with a relatively light weight of 6-6316388. The material is configured by the combination of the grounding roller 13 and the divided piece 36 which are symmetrically divided by the roller shaft 14 by being mounted integrally on the side of the roller shaft 14 The viewing angle is a basket type, and each of the divided pieces 36 is a plurality of the grounding members 37 that are used to turn the nursery surface layer with the rotation, and the connecting members 3 that connect the grounding members 37 to the left and right sides. According to the configuration of the eighth embodiment, the divided member 36 is formed by integrally forming the grounding member 37 and the connecting member 38, so that the grounding roller 13 can be made lightweight and simple. Further, the grounding members of the respective grounding members can be made. The traveling trajectory, the predetermined trajectory of the grading member, and the trajectory of the former grading member for the grading member in the direction of rotation, intersecting the grounding roller in the state of the nursery surface The traveling speed is driven, and the driving speed of the grounding roller is changed as the speed of the traveling body changes. The grounding operation (mower tilling operation) using the respective soil preparation members is substantially not repeated in the interior of the nursery surface. Since it is not necessary to carry out the necessary tillage on the nursery after the soiling, it is possible to prevent the deterioration of the seedling growth and the like due to excessive tillage. [Embodiment] The best mode for carrying out the invention is as follows, according to the drawing A first embodiment of the present invention will be described. Fig. 1 is a transplanting machine including the grounding roller of the present invention, that is, a boarding machine. In the side view of the machine, the riding machine is the same as the conventional one, and the rice transplanting machine 4 can be freely moved up and down by the lifting rod 6 behind the traveling body 3 supported on the front and rear wheels 1'2, and 1316388 On the front side (inner side) side of the seedling placing table 7 of the above-described rice transplanting machine 4, as shown in Fig. 1 and Fig. 2, a vertical frame in the longitudinal direction is provided. 8. A horizontal frame 9 that is integrally fixed to the vertical frame 8 and that is horizontally disposed below the vertical frame 8 in the left-right direction. Further, a plurality of seeding casings 11 are attached to the lateral frame 9 side, and The seeding casing 11 is provided with a seeding claw 12 for seedling insertion. Further, a plurality of floats 10 are provided in the left-right direction below the seeding casing 11, and the docking machine is used to contact the float 10 with the surface of the nursery. The rice transplanting machine 4 is lowered, and while the traveling body 3 is being driven, the seeding claws 12 are rotationally driven, and the seeding claws 12 are picked up from the seedling placing table 7, and then inserted into the nursery. Since the riding transplanter is not a soil transplanting synchronous transplanting machine, the transplanting operation of the seedlings is carried out on the nursery after the soil is turned over. Further, on the side of the insertion work machine 4, in front of the seeding claw 12 and behind the rear wheel 2, at a position intermediate the seeding claw 12 and the rear wheel 2, roughly covers the entire width of the rice transplanting machine 4 The grounding roller 13 is rotatably driven to be pivotally mounted on the fulcrum shaft (roller shaft) 14. After the grounding roller 13 is inserted into the nursery and then rotationally driven, it can be used in the above-mentioned transplanting operation, because the traveling body 3 is The seedlings, pillows, etc. after the soiling, such as the rotation, are grounded, so that the rank can be inserted on the nursery after the soil preparation. Next, the support structure of the above-described ground preparation roller 13 will be described. Between the upper sides of the two vertical frames 8, the shafts 16 in the left-right direction are rotatably supported, and on the left and right sides of the shafts 16, the upper arms i 7 -8 - 1316388 are protruded. . Further, on the lower side of each of the left and right vertical frames 8, the lower arm 20 is pivotally supported by the rocker. Further, between the front end sides of the left and right upper arms 17 and the front end sides of the left and right lower arms 20, the trailing arms 18 are axially supported, and the roller shaft 1 is interposed between the lower end sides of the left and right trailing arms 18 4, the plurality of grounding rollers 13 are axially supported in the left-right direction. Further, the grounding roller 13 is rotationally driven by the driving force of the gear housing 15 which is disposed at the approximate center position in the left-right direction. At this time, a lever 2 3 is protruded from the shaft 16 and the lever 2 is passed through the lever guide 24 fixed to the vertical frame 8. In this way, when the shaft 16 is rotated by the rocking of the control lever 23, the height can be adjusted by lifting the grounding roller 13 via the upper arm 17 and the trailing arm 18', and is set by locking the control lever 23 to any one. The plurality of step portions on the upper end and the lower side of the lever guiding portion 24 allow the height of the leveling roller 13 to be positioned and adjusted stepwise. As shown in the third (a) and third (b) views, each of the above-described ground preparation rollers 13 is symmetrically divided into two by the roller shaft 14 and is divided by two divided pieces 36, 36 of the same shape. The combination is configured such that the entire body becomes a positive hexagonal basket type on the side. Further, each of the divided pieces 36 is composed of a plurality of plate-shaped grading members 37 that plough the surface of the seedlings with rotation, and a connecting member 38 that connects the grading members 37 to the left and right sides. Further, each of the grounding members 37 and the connecting member 38 of the two divided pieces 36 is integrally molded by a resin. Further, on both sides of the holding roller shaft 14 of the connecting member 38, a bolt seat 43 for attaching and fixing the screw 42 of the split piece 36 and a nut hole 46 for accommodating the nut 44 are formed. Further, in each of the connecting members 3 8 1316388, a notched portion for penetrating the semicircular shape of the roller shaft 14 is formed. Thereby, the bolt seat 43 of one of the divided pieces 36 is opposed to the nut hole 46 of the other divided piece 36, and the roller shaft 14 is held by the notch portion, and the two divided pieces 36 are taken from the circumferential side of the roller shaft 14 Mounted at this time, the plug portion 49 perpendicularly intersecting the roller shaft 14 is inserted, and both ends of the plug portion 49 are inserted into the sides of the divided pieces 36, and the two divided pieces 3 are fixed by the bolt 42 and the nut 44. 6. The grounding roller 1 3 system is rotated with the roller shaft 1 4 and grounded for installation. Further, by releasing the fixing of the bolt 42 and the nut 44, the two divided pieces 3 6 (decomposing the grounding roller 1 3) can be removed from the peripheral surface side of the roller shaft 14 . On the one hand, the above-mentioned ground preparation roller 13 can be adjusted by the height of the control rod 23 as described above, and can be inserted from the upper side of the float 10 to protrude below the float 10, and can be inserted from the protrusion of the float 10. Part of the nursery is carried out, and the soil preparation work is carried out. However, the height of the grading roller 13 is such that the deepest depth at which the grading roller 13 is inserted into the nursery can be adjusted to a range of less than the depth Z of the insertion depth (more on the surface side than the insertion depth Z) (refer to FIG. 4), thereby making the grounding roller The 1 3 series only flattens the surface portion Y which is shallower than the insertion depth z of the nursery (see Fig. 4). Further, in the grounding roller 13 of the present embodiment, the amount of protrusion from the lower surface of the float 10 can be adjusted to be in the range of approximately 10 to 40 mm, so that the surface portion Y of the surface layer portion Y which is shallower than the insertion depth Z at the time of the insertion operation can be performed. Thereby, the height of the soil preparation roller 13 can be adjusted in accordance with the depth of the insertion (which can be changed as well), and the grounding roller 13 is inserted into the nursery and then rotationally driven to make the grounding roller 13 only flatten the ratio of the nursery to the depth of the seedling. 10 1316388 degree d shallower surface portion Y' can thus be turned over by the wheel traces of the traveling body 3 or the like due to the rotation of the traveling body 3 during the insertion work, etc. Nursery, pillows, etc. to carry out the land preparation 'for the nursery after the land preparation, the stable transplanting operation can be carried out smoothly. On the one hand, when the nursery that turns over the soil is turned over again or the same level of land preparation as the soil is turned, the nursery face will cause excessive tillage, and the deterioration of the growth of the seedlings will be bad. Known. Furthermore, the grounding roller 13 is used for the insertion work on the nursery after the soil is turned over. Therefore, by using the soil preparation roller 13 , excessive tillage can be prevented. As shown in Fig. 4, the soil preparation members 37 are provided. The traveling trajectory is such that the traveling trajectory α of the predetermined grading member 37a and the traveling trajectory 0 of the former grading member 37b which is the rotating direction for the grading member 37a intersect with the A portion near the nursery surface from the side. To set the rotation speed. Further, Fig. 4 shows the positions of the two grading members 37a, 37b which follow the traveling body 3 in a series of time series of sixteen stages. Further, as shown in Fig. 1, the gear housing 15 for the grounding roller 13 is driven by the driving force of the transmission portion 25 of the rear wheel 2, so when the traveling speed is changed, the grounding is changed depending on the traveling speed. The rotational speed of the roller 13 is generally changed as shown above, and the traveling trajectory of the predetermined grading member 37a and the first grading member for the grading member 37a are generally as shown above. The path of travel of 37b Θ 'crosses from the side of the nursery surface. In this way, the ground preparation wheel 1 3 according to the ground preparation operation (tillage nursery operation) of the soil preparation members 3, regardless of the speed of travel, will only repeat the soil on the surface of the nursery -11 - 1316388, more internal than the surface of the field There was almost no repetition of the soil. In other words, comprehensive soil preparation is performed on the surface of the nursery in a state where no leakage is caused, and in the nursery, rough soil preparation work is performed in a state where leakage is caused. In this way, since the necessary tillage is not carried out on the nursery after the soil is turned over, it is possible to prevent the deterioration of the seedling growth due to excessive tillage, and since the surface of the nursery is not damaged. , about: covering the whole width of the transplanting machine 3 for land preparation, the weeding effect can be achieved by cultivating the weed seeds or weeds dropped on the nursery after the soil is turned into the soil. In addition, since the soil preparation system does not reach the depth Z of the transplanting, the soil of the root portion of the seedling is not too soft, so that the posture of the seedling can be stabilized, and the seedlings can be erected to reduce the inclination of the seedlings. Further, by interlocking the rotational speed of the grounding roller 13 with the traveling speed of the traveling body 3, the soil or muddy water on the surface of the nursery can be moved rearward at a constant speed, so that the accumulation of dirt or muddy water in front of the float 10 can be prevented. Or the accumulation of mud or mud in front of the soil preparation roller 13 can also prevent the poor insertion caused by mud or muddy water. For this reason, the rotational speed of the grading roller 13 is 1.5 to 2.5 times the vehicle speed of the traveling body 3, in other words, it is set at 1.5 to 2·5 m/s for the traveling speed im/s. Further, as described above, since the grounding roller 13 is only flattened on the extreme surface side of the nursery, the driving force of the grounding roller 13 is relatively small, and therefore, other transmission portions as described above can be used. In the embodiment, the driving force of the transmission portion 25) for driving the rear wheel 2 is dispersed, so that the driving mechanism of the grounding roller 13 can be simply constituted by -12-133168. Further, since the soil preparation portion is as described above as the extremely shallow surface layer of the nursery, and the soil preparation roller 13 itself does not require a large strength, it can be formed by using a relatively lightweight material such as resin or resin as shown in the present embodiment. 'It is possible to simplify the construction of the grounding roller 13 and to make the driving force smaller due to the lightweight '. [Simple description of the drawing] Fig. 1 is a side view of the rice transplanter. Figure 2 is a front elevational view of the main part of the grounding roller section. In Fig. 3, (a) is a side view of the grounding roller, and (b) is a front view of the divided piece. Fig. 4 is a side elevational view showing the position of two grading members in a series of time series of 16 stages. DESCRIPTION OF REFERENCE NUMERALS 3 traveling body 12 seeding claw (plugging portion) 1 3 grading roller 3 7 grading member 3 7a grading member 3 7b grading member 3 8 coupling member Z ploughing depth -13 - 1316388 α trajectory of the grading member θ Track-14