JP3818009B2 - Rice transplanter - Google Patents

Rice transplanter Download PDF

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Publication number
JP3818009B2
JP3818009B2 JP2000086660A JP2000086660A JP3818009B2 JP 3818009 B2 JP3818009 B2 JP 3818009B2 JP 2000086660 A JP2000086660 A JP 2000086660A JP 2000086660 A JP2000086660 A JP 2000086660A JP 3818009 B2 JP3818009 B2 JP 3818009B2
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seedling
planting
supply port
case
planting tool
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JP2001269023A (en
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和弘 竹川
塩崎  孝秀
篤史 北尾
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Iseki and Co Ltd
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Iseki and Co Ltd
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Description

【0001】
【発明の属する技術分野】
この発明は、苗載置台上のマット状の苗から掻き取った苗を苗押出体により押し出して圃場に植え付ける苗植付具を備える田植機に関するものである。
【0002】
【従来の技術】
従来、特開平11−75447号公報に示すように、田植機等の苗移植機において、苗載置台上のマット状の苗から一株分の苗を掻き取る植付爪と該植付爪40が掻き取った苗を押し出すべく摺動する苗押出体41とを備え、前記苗押出体の一部と該苗押出体を摺動させるための苗押出スプリングとをケ−ス内に設けた構成の苗植付具がある。そして、前記苗押出体の摺動をスム−ズに行わせるべく前記ケ−ス内にグリス等の潤滑剤を供給するための潤滑剤供給口を設けたものがあるが、この潤滑剤供給口は苗押出体を摺動させる苗押出ア−ムの近くに設けたものであった。
【0003】
【発明が解決しようとする課題】
上記従来技術の構成によると、前記ケ−ス内のスペ−スが小さいために前記潤滑剤の粘性が高くなると、潤滑剤供給口から供給した潤滑剤がケ−ス内に行きわたらずにケ−ス内の潤滑にむらを生じることがあり、長期にわたって使用すると苗押出体を含めた該苗押出体を摺動させる構成部材の一部に著しく摩耗を生じ、苗押出体の摺動が適正に且つスム−ズに行われなくなるおそれがある。
【0004】
【課題を解決するための手段】
この発明は、上記の課題を解決するために、次の技術的手段を講じた。
すなわち、請求項1に係る発明は、苗植付装置駆動軸(30)と一体回転する回転ケース(31)を設け、該回転ケース(31)の端部に苗植付具(32)を回転ケース(31)に対して逆方向に回転するように装着し、前記苗植付具(32)は、苗載置台20上のマット状の苗から一株分の苗を掻き取る植付爪41と該植付爪41が掻き取った苗を押し出すべく摺動する苗押出体42とを備え、前記植付爪(41)の先端部には基部側に向かう切欠き部(41d)を設け、前記苗押出体42の一部と該苗押出体42を摺動させるための苗押出スプリング51とをケ−ス32a内に設け、前記苗押出体42より上位で且つ前記苗押出スプリング51の近くに前記ケ−ス32a内に潤滑剤を供給するための潤滑剤供給口56を設け、該潤滑剤供給口56を閉塞するための供給口キャップ57を設けると共に、該供給口キャップ57を前記潤滑剤供給口56に装着したとき、前記供給口キャップ57の少なくとも一部57bが苗押出スプリング51の内径部53に挿入される構成とし、苗植付具(32)が苗を掻き取るとき苗押出体(42)の苗押出面はその下側が上側より先に苗床に接触し、苗植付具(32)が苗を植え付けるとき前記苗押出面は前上がりとなるよう傾斜し、苗植付具(32)が苗を植え付けるべく苗押出体(42)が押出作動する直前において植付爪(41)の切欠き部(41d)の後端が苗押出体(42)の前端より後位となる田植機とした。
【0005】
【発明の効果】
従って苗押出体42より上位に潤滑剤供給口56を設けているので、潤滑剤供給口56から潤滑剤をケ−ス32a内の苗押出体42付近に供給することができ、摺動する苗押出体42の摩耗を抑制できるばかりでなく、苗押出体42の摺動により潤滑剤がケ−ス32a全体に行きわたらせることができ、長期にわたって苗押出体42の摺動を適正に且つスム−ズに行わせることができる。
【0006】
また苗押出スプリング51の近くに潤滑剤供給口56を設けているので、苗押出体42の摺動により撓んで変形を繰り返すために損傷や摩耗が生じやすい苗押出スプリング51に潤滑剤を供給することができ、前記苗押出スプリング51の損傷や摩耗を抑制することができ、苗植付具の耐用性を向上させることができる。
【0007】
また潤滑剤供給口56に装着した供給口キャップ57の少なくとも一部57bが苗押出スプリング51の内径部53に挿入される構成としたので、潤滑剤供給口56を苗押出スプリング51に近接した配置とすることができ苗押出スプリング51に的確に潤滑剤を供給することができ、前記苗押出スプリングの損傷や摩耗を抑制することができ、苗植付具の耐用性を向上させることができる。また、前記供給口キャップ57を苗押出スプリング51の位置決め部材と兼用することができる。
【0008】
また、苗植付具32が苗を掻き取るとき苗押出体42の苗押出面はその下側が上側より先に苗床に接触し、苗植付具32が苗を植え付けるとき前記苗押出面は前上がりとなるよう傾斜し、苗植付具32が苗を植え付けるべく苗押出体42が押出作動する直前において植付爪41の切欠き部41dの後端が苗押出体42の前端より後位となるので、苗を後傾姿勢で植え付けた後に苗植付具32が前側へ押すことで該苗が鉛直な姿勢となるように修正され、圃場に適正な姿勢で苗を植え付けることができる。
【0009】
【発明の実施の形態】
この発明の実施の一形態を図面に基づき説明する。
【0010】
図1及び図2は、乗用型の田植機1を示すものであり、この乗用型の田植機1は、走行車体2と6条植えの苗植付部3とから構成される。
【0011】
走行車体2の略中央に駆動源であるエンジン4が備えられ、該エンジン4の駆動により走行ミッションケ−ス5等を介して前輪6,6及び後輪7,7が駆動され、これらの前後輪6,6,7,7が駆動されて走行車体2が走行する。前記エンジン4の上方に操縦席8が備えられ、該操縦席8の前側にステアリングハンドル9が設けられている。この走行車体2の後部に昇降リンク機構10が設けられ、該昇降リンク機構10を介して前記苗植付部3が装着され、油圧昇降シリンダ11の伸縮により上下に昇降するように設けられている。尚、走行車体側からの動力が植付クラッチケ−ス12を介して前記苗植付部3に伝動されるようになっている。
【0012】
また、操縦席前側のステップ部には有段操作される株間変速レバ−13が設けられており、走行車体2の走行速度に対する苗植付部3の作動速度を変速できるようになっている。この株間変速レバ−13により、植付作業者が圃場に移植する苗の植付株間を設定できるようになっている。従って、前記株間変速レバ−13を操作しない限り、走行速度に比例した速度で前記苗植付部3が作動されるようになっている。
【0013】
苗植付部3は、苗載置台20と植付伝動部21及び各条の苗植付装置22,…とを備えて構成される。苗植付部3の下部には、センタ−フロ−ト23及び両側部にサイドフロ−ト24,24が設けられており、該フロ−ト23,24,24が圃場面を滑走する構成である。
【0014】
また、苗植付部3は、植付伝動部21からの動力により前記苗植付装置22を作動する。前記苗載置台20は、上部を苗載置台支持ロ−ラ25,25、下部を左右移動ガイド板26により左右移動可能に支持されている。従って、苗植付部3は、苗載置台20が固着された苗載置台左右移動棒27を左右移動させて苗載置台20を左右移動させ、マット状の苗を苗植付装置22により一株づつ掻き取る構成となっている。尚、前記左右移動ガイド板26には、苗植付装置22,…の苗掻き取り口26a,…が設けられている。また、前記苗載置台20は、左右移動終端においてマット状の苗を各条の苗送りベルト28,…により苗載置台20に沿って苗植付装置側に順次移送する公知の構成である。
【0015】
苗植付装置22は、植付伝動部21の植付伝動フレ−ム29の端部から出力され機体の走行速度に比例して一定速度で回動する苗植付装置駆動軸30の駆動により作動するようになっている。尚、前記苗植付装置駆動軸30は、前側から巻きかけたチェ−ン37からの伝動により駆動する従動スプロケット38と安全クラッチ39とを介して伝動されて駆動する。前記安全クラッチ39は、該従動スプロケット38の端部に一体で設けた駆動クラッチ爪39a、該駆動クラッチ爪39aと噛み合う受動クラッチ爪を備える受動クラッチ爪体39b及び前記従動スプロケット38を前記受動クラッチ爪体39b側へ付勢する圧縮スプリング39cを備えて構成される。尚、前記従動スプロケット38すなわち前記駆動クラッチ爪39aは苗植付装置駆動軸30回りに回転するように設けられ、前記受動クラッチ爪体39bは前記苗植付装置駆動軸30と一体回転するようになっている。前記駆動クラッチ39a爪及び受動クラッチ爪体39bの爪部は傾斜面を備えており、苗植付装置22が異物等に干渉してメカロックを起こすと、前記傾斜面により圧縮スプリング39cに抗して駆動クラッチ爪39aすなわち従動スプロケット38が受動クラッチ爪体39bとは反対側に移動して、安全クラッチ39の伝動を断つようになっている。
【0016】
前記苗植付装置22は、苗植付装置駆動軸30と一体回転する回転ケ−ス31と該回転ケ−ス31の両端部にそれぞれ装着された苗植付具32,32とを備えて構成され、該苗植付具32,32が前記苗掻き取り口26a上の苗を掻き取り、掻き取った苗を圃場に植え付けていくようになっている。前記回転ケ−ス31が該苗植付装置駆動軸30と一体回転するように取り付けられると共に、回転ケ−ス31内の太陽ギヤ33が前記植付伝動フレ−ム29に対して回転しないように設けられ、回転ケ−ス31の回動により該太陽ギヤ33と噛み合う中間ギヤ34,34を前記太陽ギヤ33回りに回動させ、前記中間ギヤ34,34の駆動により該中間ギヤ34,34と噛み合う最終ギヤ35,35を回動させる。そして、該最終ギヤ35,35と一体回転する最終ギヤ回動軸36,36の端部の方形軸部が苗植付具32の苗植付具固定部材32cの方形穴部に嵌合しており、前記最終ギヤ回動軸と前記苗植付具32,32を一体回転させ、前記回転ケ−ス31の回動位置に対して前記苗植付具32,32の前後傾斜姿勢が決定される。すなわち、前記苗植付具32が最終ギヤ35と一体回転するようになっている。また、前記中間ギヤ34,34及び前記最終ギヤ35,35は、前記太陽ギヤ33に対して対称位置に設けられてそれぞれの苗植付具32,32の前後傾斜姿勢を決定するようになっている。尚、苗植付具32,32には苗植付具ケ−ス32a,32aを備えており、該苗植付具ケ−ス32aを2本の取付ボルト32b,32bにより前記苗植付具固定部材32cに固着している。
【0017】
また、前記太陽ギヤ33と前記中間ギヤ34,34と前記最終ギヤ35,35とは非円形の偏心ギヤであると共にそれぞれ同歯数であり、回転ケ−ス31の一回転につき前記中間ギヤ34,34及び前記最終ギヤ35,35が回動角速度を変えながらそれぞれ一回転する。従って、回転ケ−ス31が一回転する間に、苗植付具32,32が回転ケ−ス31の回動とは逆方向に該回転ケ−ス31に対して一回転するようになっている。
【0018】
また、回転ケ−ス31内の太陽ギヤ33、中間ギヤ34及び最終ギヤ35の噛み合いにおけるバックラッシにより発生するガタを吸収すべく、ガタ止め機構40を回転ケ−ス31内に設けている。前記ガタ止め機構40は、最終ギヤ35と一体回転するガタ止めカム40aと該カム40aに当接するガタ止めア−ム40bと該ア−ム40bを前記ガタ止めカム40a側に付勢するガタ止めスプリング40cとを備えて構成される。このガタ止め機構40cにより、苗植付装置22が苗掻き取り口26aから苗を掻き取るとき及び掻き取った苗を圃場に植え付けるときに前記バックラッシによる最終ギヤ35のガタを止めて苗植付具32の前後傾斜姿勢のガタを抑え、該苗植付具32により適確に苗を掻き取り適確に圃場に苗を植え付けるようにしている。
【0019】
前記苗植付具32は、マット状の苗を一株分掻き取って保持する植付爪41と該植付爪41で分離して保持した苗を圃場面へ向けて押し出す苗押出体の一例である苗押出フォ−ク42とを備えて構成される。前記回転ケ−ス31の回動により苗植付具32がル−プ軌跡Tを描いて前記苗掻き取り口26aを通過することにより、前記植付爪41が苗掻き取り口26aにある苗を掻き取り保持するようになっている。
【0020】
前記植付爪41は、取付ボルト43により苗植付具ケ−ス32aに固着されており、上壁部41aと該上壁部41aの先端側の左右両端部から下方へ突出して設けられた左右の側壁部41c,41cとを備えて構成される。また、前記上壁部41aの左右中央には、植付爪41の先端部から基部側に向かって切欠き部41dを設けている。尚、前記切欠き部41dは、前記左右の側壁部41c,41cより植付爪41の基部側にまで延設されると共に、植付爪41の先端において前記上壁部41aの左右幅と略同一に構成され、植付爪41の先端から基部側に向かうに従って左右幅が縮小され、所定の位置から基部側は一定の左右幅となっている。従って、植付爪41の先端部において、上壁部41a及び左右の側壁部41c,41cにより横断面が左右一対のL字型で構成される苗保持部を構成している。
【0021】
苗押出フォ−ク42は、押出作動により前記苗植付具ケ−ス32aに対して摺動する丸軸部42aと該丸軸部42aの先端に固着された苗押出部42bとを備えて構成される。前記苗押出部42bには苗押出基部42cと左右の苗押出プレ−ト42d,42dとを設け、該苗押出プレ−ト42d,42dの前端部が植付爪41が保持した苗の苗床に当接して植付爪41が保持した苗を押し出すようになっている。左右の前記苗押出プレ−ト42d,42dは、植付爪41の側壁部41c,41cより左右内側の該側壁部41c,41cの近傍に設けられ、該プレ−ト42d,42dの上部が側面視で植付爪41の前記側壁部41c,41cと重複するように設けられている。
【0022】
前記苗押出フォ−ク42の上部すなわち丸軸部42aの一部は、苗植付具ケ−ス32a内に挿入されている。前記苗植付具ケ−ス32a内には、前記苗押出フォ−ク42の上端部に下部支軸44aを介して連結された連結リンク44と、該連結リンク44に上部支軸44bを介して連結した苗押出ア−ム45と、苗押出ア−ム45と一体的に設けたカム側ア−ム46と、該カム側ア−ム46と当接する苗押出カム47とを備えている。尚、前記苗押出ア−ム45及び前記カム側ア−ム46は、苗植付具ケ−ス32aに取り付けた揺動軸48回りに一体で揺動するようになっている。尚、前記連結リンク44は、前記下部支軸44aを介して前記苗押出フォ−ク42に連結されているが、苗押出フォ−ク42と当接することにより該苗押出フォ−ク42に対してほとんど回動しないように設けられている。また、前記苗押出カム47は、回転ケ−ス31の最終ギヤ回動軸36,36回りに回動可能に設けられると共に、該苗押出カム47の回転ケ−ス31側の端部47aの外形が側面視で方形に構成されて回転ケ−ス31の方形穴部49に挿入されており、前記回転ケ−ス31に対して回動しないように設けられている。従って、回転ケ−ス31の一回転につき、苗押出カム47が苗植付具32に対して一回転する構成となっている。そして、苗植付具32に対する苗押出カム47の一回転につき、カム側ア−ム46を介して苗押出ア−ム45が1往復分揺動し、苗押出フォ−ク42が1往復分摺動する構成となっている。尚、苗植付具ケ−ス32aにおける苗押出フォ−ク42が摺動する部分にはゴム製のシ−ル材50を設けており、該シ−ル材50により苗押出フォ−ク42の摺動により苗植付具ケ−ス32a内に供給された後述するグリス(潤滑剤)が苗植付具ケ−ス32a外へ連れ出されないようにしている。
【0023】
連結リンク44の上端部には、圧縮スプリングである苗押出スプリング51を当接させて設けている。尚、苗押出スプリング51の他端は、苗植付具ケ−ス32aの内面に当接している。また、前記連結リンク44の上端部には、前記苗押出スプリング51の下端部が当接するための当接面を構成している。そして、苗押出フォ−ク42は、前記苗押出スプリング51により苗の押出作用側へ付勢されており、前記苗押出カム47により苗の押出作用側への摺動を規制され、カム側ア−ム46が苗押出カム47の小径部47bに当接する状態で苗押出スプリング51により摺動して押出作動するようになっている。尚、苗植付具32のル−プ軌跡Tの下死点Aの位置にきたとき、前記苗押出フォ−ク42が押出作動するようになっている。そして、苗植付具32が前記下死点Aの位置から上昇して苗掻き取り口26aの位置に来るまでに押出作動した苗押出フォーク42が戻り作動して、植付爪41が苗を掻き取るまでに苗押出フォーク42が戻り作動するようになっている。尚、苗押出フォ−ク42が押出作動したときに苗押出ア−ム45と当接するクッションゴム52を苗植付具ケ−ス32a内に設けており、該クッションゴム52により苗押出スプリング51による苗押出フォ−ク42の押出作動の衝撃を緩和する構成となっている。
【0024】
そして、苗押出スプリング51の圧縮方向と苗押出フォ−ク42の摺動方向とは同方向であり、苗押出フォ−ク42の丸軸部42aの軸心の延長線が苗押出スプリング51の内径部53を通過する位置関係になっている。従って、苗押出スプリング51のスプリング力が苗押出フォ−ク42に対して該フォ−ク42の摺動方向と交差する方向に作用しないようにでき、苗押出フォ−ク42をスム−ズに摺動させることができ、苗押出フォ−ク42の摺動部に設けたシ−ル材50や苗押出フォ−ク42の丸軸部42aの摺動部等の摩耗を抑えることができる。
【0025】
ところで、前記苗押出スプリング51の上側の苗植付具ケ−ス32aの上端部には、潤滑剤供給口56を設けている。この潤滑剤供給口56より苗植付具ケ−ス32a内へ潤滑剤であるグリスを吐出する吐出口を挿入する等して、前記グリスを苗植付具ケ−ス32a内に供給するようになっている。苗植付具ケ−ス32a内に供給されたグリスにより、苗押出フォ−ク42、苗押出スプリング51、連結リンク44、苗押出ア−ム45、カム側ア−ム46及び苗押出カム47といった苗植付具ケ−ス32a内の苗押出フォ−ク42を摺動させる構成部材を潤滑し、これらの構成部材をスム−ズに作動させると共にこれらの構成部材の摩耗を抑制するようになっている。尚、前記潤滑剤供給口56は、苗押出スプリング51の内径より小さい径で構成されている。
【0026】
そして、前記潤滑剤供給口56には、苗植付具ケ−ス32a内のグリスが潤滑剤供給口56から飛び出さないように該供給口56を閉塞するための供給口キャップ57を設けている。この供給口キャップ57は、ゴム製であり、潤滑剤供給口56より径が大きい大径部57aと前記潤滑剤供給口56と外形が略同径の小径部57bとを備え、前記小径部57bが潤滑剤供給口56に嵌入して該潤滑剤供給口56を閉塞する構成となっている。前記小径部57bは、内側に空洞が設けられており、径方向に撓みやすく、潤滑剤供給口56へ嵌入しやすく構成されている。尚、前記小径部57bは、苗押出スプリング51の内径より若干径が小さく、図5に示すように、供給口キャップ57を装着したとき苗押出スプリング51の内径部53に挿入された状態となる。
【0027】
以上により、この苗植付具32は、回転ケ−ス31の回転により、上下方向のル−プ軌跡Tで旋回し植付爪41により苗載置台20の下部の苗掻き取り口26aから一株分の苗を掻き取ってその掻き取った苗を圃場面に移送し、苗押出フォ−ク42が摺動して圃場に苗を押し出して植え付ける。一株分の苗を掻き取るとき、苗床から上方に延びる苗の葉が植付爪41の切欠き部41dに入ると共に植付爪41の先端部の上壁部41aと左右の側壁部41c,41cとにより苗植付具32に一株分の苗床が保持され、圃場面に移送する苗の苗床が分離しないように確実に苗床を保持する。また、苗植付具32に保持された苗は、前記左右の側壁部41c,41cの左右内側近傍にある苗押出フォ−ク42の苗押出プレ−ト42d,42dの押出作動により確実に圃場に植え付けられる。
【0028】
そして、この苗植付具32は、苗押出フォ−ク42の丸軸部42aの一部を苗植付具ケ−ス32a内に設けた構成となっており、前記苗押出フォ−ク42より上位の苗植付具ケ−ス32aの上端部に前記ケ−ス32a内に潤滑剤であるグリスを供給するための潤滑剤供給口56を設けている。
【0029】
よって、苗押出フォ−ク42より上位に潤滑剤供給口56を設けているので、潤滑剤供給口56からグリスを苗植付具ケ−ス32a内の苗押出フォ−ク42付近に供給することができ、摺動する苗押出フォ−ク42の丸軸部42aの摺動部の摩耗を抑制できるばかりでなく、苗押出フォ−ク42の摺動によりグリスが苗植付具ケ−ス32a全体に行きわたらせることができ、長期にわたって苗押出フォ−ク42の摺動を適正に且つスム−ズに行わせることができる。
【0030】
また、この苗植付具32は、前記苗押出フォ−ク42の丸軸部42aの一部と該苗押出フォ−ク42を摺動させるための苗押出スプリング51を苗植付具ケ−ス32a内に設けた構成となっており、前記苗押出スプリング51の上端近くの苗植付具ケ−ス32aの上端部に前記ケ−ス32a内に潤滑剤であるグリスを供給するための潤滑剤供給口56を設けている。
【0031】
よって、苗押出スプリング51の近くに潤滑剤供給口56を設けているので、苗押出フォ−ク42の摺動により撓んで変形を繰り返すために損傷や摩耗が生じやすい苗押出スプリング51にグリスを供給することができ、前記苗押出スプリング51の損傷や摩耗を抑制することができ、苗植付具32の耐用性すなわち寿命を向上させることができる。
【0032】
また、この苗植付具32は、潤滑剤供給口56を閉塞するための供給口キャップ57を設けると共に、該供給口キャップ57を前記潤滑剤供給口56に装着したとき、前記供給口キャップ57の小径部57bが苗押出スプリング51の内径部53に挿入される構成としている。
【0033】
よって、潤滑剤供給口56に装着した供給口キャップ57の少なくとも一部57bが苗押出スプリング51の内径部53に挿入される構成としたので、潤滑剤供給口56を苗押出スプリング51に近接した配置とすることができ苗押出スプリング51に的確にグリスを供給することができ、前記苗押出スプリング51の損傷や摩耗を抑制することができ、苗植付具32の耐用性すなわち寿命を向上させることができる。また、前記供給口キャップ57を苗押出スプリング51の苗押出フォ−ク42の摺動方向と交差する方向の位置決め部材と兼用することができる。
【0034】
ところで、植付作業能率を向上させるべく機体の走行速度を高速にすると、苗植付具32により苗を植え付けた直後に該苗を苗植付具32が前側へ押しながら上昇するようになり、植え付けた苗の植付姿勢が前傾姿勢となるおそれがある。ところが、図7に示すように、苗植付具32が下死点Aで苗を植え付けるべく押出作動した苗押出フォ−ク42の苗押出面となる苗押出プレ−ト42d,42dの端面は、水平面に対して前上がりに傾斜した状態となる。これにより、苗植付具32の作動軌跡Tの下死点Aで苗押出フォ−ク42が押出作動して苗を植え付けると、苗は若干後傾姿勢で植え付けられるので、植え付けた後に苗植付具32が苗を前側へ押すことで該苗が鉛直な姿勢となるように修正されることになり、圃場に適正な姿勢で苗を植え付けることができる。また、苗植付具32が苗掻き取り口26aで苗を掻き取るとき、前記苗押出フォ−ク42の苗押出面となる苗押出プレ−ト42d,42dの端面は苗掻き取り口26a上の苗の床部すなわち左右移動ガイド板26の前後傾斜に対して平行かそれより苗押出プレ−ト42d,42dの端面の下側が上側より先に苗床に接触するように傾斜しているので、苗掻き取り時に苗が後傾姿勢で苗植付具32に保持されることとなり、作動軌跡Tの下死点Aで苗を後傾姿勢で植え付けることができる。従って、後傾姿勢で植え付けられた苗を直後に苗植付具32が前側へ押すことで該苗が鉛直な姿勢となるように修正されることになり、圃場に適正な姿勢で苗を植え付けることができる。
【0035】
尚、苗植付具32が下死点Aで苗を植え付けるべく苗押出フォ−ク42が押出作動する直前において、植付爪41の切欠き部41dの後端が苗押出フォ−ク42の前端より後位にあるので、植付爪41に保持された苗を植え付ける直前において後傾姿勢とすることができる。そして、苗押出フォ−ク42が押出作動すると、該苗押出フォ−ク42が若干前側に傾く下方に向けて押出作動するので、苗床が若干前側に押し出され、苗を後傾姿勢で植え付けることができる。従って、後傾姿勢で植え付けられた苗を直後に苗植付具32が前側へ押すことで該苗が鉛直な姿勢となるように修正されることになり、圃場に適正な姿勢で苗を植え付けることができる。
【0036】
また、苗掻き取り口26aに異物等があって苗植付具32と干渉すると、苗植付装置22の駆動においてメカロックを起こさないために、苗植付装置駆動軸30に設けた安全クラッチ39が作動して苗植付装置22の伝動を断つ。このとき、回転ケ−ス31の回転により連続的に作動していた苗植付装置22の駆動が突然停止するので、回転ケ−ス31内のガタ止め機構40が作用しているのも相俟って苗植付装置22の駆動の停止の衝撃が苗植付具32に伝わり、苗植付具ケ−ス32aを苗植付具固定部材32cに固着するための取付ボルト32b,32bが弛み、それに伴って苗植付具32の作動が不安定になり苗を適正に植え付けられなくなるおそれがある。ところが、図7に示すように、苗植付具32の先端が苗掻き取り口26aの位置にあるとき、苗植付具ケ−ス32aを苗植付具固定部材32cに固着するための2本の取付ボルト32b,32bが共に最終ギヤ回動軸36より前側に位置するので、安全クラッチ39の作動により苗植付装置22が突然停止しても、図7視で苗植付具32が回転ケ−ス31に対して右回りに回動するため、回転ケ−ス31内の伝動により前記2本の取付ボルト32b,32bが最終ギヤ回動軸36回りに上側に回動しようとするときに停止することとなる。従って、安全クラッチ39の作動により苗植付具32の先端が苗掻き取り口26aの位置にあるときに停止しても、前記2本の取付ボルト32b,32b共に苗植付具32の自重とは相反する方向に苗植付装置22の駆動力が伝えられるので、前記2本の取付ボルト32b,32bが共に弛みにくくなる。よって、苗の植付を再開したときに、苗植付具32の作動が不安定になり苗を適正に植え付けられなくなるのを抑えることができる。
【0037】
尚、一方の苗植付具32が苗掻き取り口26aの位置にあるとき、回転ケ−ス31の反対側に設けた他方の苗植付具32は苗を植え付ける作動軌跡Tの下死点A付近に位置する。このとき、前記他方の苗植付具32においても、苗植付具ケ−ス32aを苗植付具固定部材32cに固着するための2本の取付ボルト32b,32bが共に最終ギヤ回動軸36より前側に位置するので、安全クラッチ39の作動により苗植付装置22が突然停止しても、前記2本の取付ボルト32b,32bが共に弛みにくく、苗の植付を再開したときに苗植付具32の作動が不安定になり苗を適正に植え付けられなくなるのを抑えることができる。また、苗植付具32が作動軌跡Tの下死点A付近で苗を植え付けるとき、圃場に石等の異物があって苗植付具32と干渉することにより安全クラッチ39が作動して苗植付装置22が突然停止しても、前記2本の取付ボルト32b,32bが共に最終ギヤ回動軸36より前側に位置するので、前記2本の取付ボルト32b,32bが共に弛みにくく、苗の植付を再開したときに苗植付具32の作動が不安定になり苗を適正に植え付けられなくなるのを抑えることができる。
【0038】
尚、以上の発明の実施の形態は乗用型の田植機1について記述したが、本発明は乗用型の田植機に限定されるものではない。
同様に、以上の発明の実施の形態は回転ケ−ス31を備える苗植付装置22について記述したが、本発明はこれに限定されるものではない。
【図面の簡単な説明】
【図1】乗用型の田植機を示す側面図
【図2】乗用型の田植機を示す平面図
【図3】苗植付装置駆動軸への伝動構成を示す平面断面図
【図4】苗植付装置を示す平面一部断面図
【図5】苗植付装置を示す側面一部断面図
【図6】回転ケ−スの側面断面図
【図7】苗掻き取り時及び苗植付時の苗植付具を示す側面図
【符号の説明】
20…苗載置台、30…苗植付装置駆動軸、31…回転ケース、32…苗植付具、32a…苗植付具ケ−ス、41…植付爪、41d…切欠き部、42…苗押出フォ−ク、51…苗押出スプリング、53…苗押出スプリングの内径部、56…潤滑剤供給口、57…供給口キャップ、57b…供給口キャップの小径部
[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a seedling planting tool for extruding a seedling scraped from a mat-shaped seedling on a seedling mounting table by a seedling extrudate and planting the seedling in a field.Rice transplanter withIt is about.
[0002]
[Prior art]
  Conventionally, as shown in Japanese Patent Application Laid-Open No. 11-75447, in a seedling transplanting machine such as a rice transplanter, a planting claw for scraping off one seedling from a mat-like seedling on a seedling mounting table and the planting claw 40 And a seedling extrudate 41 that slides to extrude the seedling that has been scraped off, and a part of the seedling extrudate and a seedling extruding spring for sliding the seedling extrudate are provided in the case. There is a seedling planting tool. Further, there is a lubricant supply port for supplying a lubricant such as grease in the case so that the seedling extrudate can be smoothly slid. Was provided near the seedling extrusion arm on which the seedling extrudate was slid.
[0003]
[Problems to be solved by the invention]
  According to the configuration of the above prior art, when the viscosity of the lubricant increases because the space in the case is small, the lubricant supplied from the lubricant supply port does not reach the case. -If the product is used for a long period of time, it may cause wear on some of the components that slide the seedling extrudate, including the seedling extrudate. In addition, there is a risk that it will not be performed smoothly.
[0004]
[Means for Solving the Problems]
  In order to solve the above problems, the present invention has taken the following technical means.
  That is, the invention according to claim 1A rotating case (31) that rotates integrally with the seedling planting device drive shaft (30) is provided, and the seedling planting tool (32) is placed in the opposite direction to the rotating case (31) at the end of the rotating case (31). Wearing to rotate, the seedling planting tool (32)A planting claw 41 for scraping one seedling from the mat-like seedling on the seedling mounting table 20 and a seedling extrudate 42 that slides to extrude the seedling scraped off by the planting claw 41;The tip of the planting claw (41) is provided with a notch (41d) toward the base side,A part of the seedling extrudate 42 and a seedling extruding spring 51 for sliding the seedling extruding body 42 are provided in the case 32 a, higher than the seedling extruding body 42 and near the seedling extruding spring 51. Provided with a lubricant supply port 56 for supplying a lubricant into the case 32a, a supply port cap 57 for closing the lubricant supply port 56, and the supply port cap 57 with the lubrication. When mounted on the agent supply port 56, at least a portion 57b of the supply port cap 57 is inserted into the inner diameter portion 53 of the seedling extrusion spring 51,When the seedling planting tool (32) scrapes off the seedling, the lower side of the seedling extrusion surface of the seedling extrudate (42) contacts the seedbed before the upper side, and when the seedling planting tool (32) plants the seedling, the seedling The extrusion surface is inclined so as to rise forward, and immediately after the seedling extruding body (42) is pushed out so that the seedling planting tool (32) can plant the seedling, after the notch (41d) of the planting claw (41). Rice transplanter whose end is behind the front end of the seedling extrudate (42)It was.
[0005]
【The invention's effect】
  Therefore,Since the lubricant supply port 56 is provided above the seedling extrudate 42, the lubricant can be supplied from the lubricant supply port 56 to the vicinity of the seedling extrudate 42 in the case 32a, and the sliding seedling extrusion Not only can the wear of the body 42 be suppressed, but also the lubricant can be spread over the entire case 32a by the sliding of the seedling extruding body 42, and the sliding of the seedling extruding body 42 can be performed properly and smoothly over a long period of time. Can be done.
[0006]
  Also,Since the lubricant supply port 56 is provided near the seedling extrusion spring 51, the lubricant is supplied to the seedling extrusion spring 51 which is likely to be damaged and worn due to bending and repeated deformation due to the sliding of the seedling extrusion 42. Thus, damage and wear of the seedling push spring 51 can be suppressed, and durability of the seedling planting tool can be improved.
[0007]
  Also,Since at least a part 57 b of the supply port cap 57 attached to the lubricant supply port 56 is inserted into the inner diameter portion 53 of the seedling extrusion spring 51, the lubricant supply port 56 is disposed close to the seedling extrusion spring 51. Thus, the lubricant can be accurately supplied to the seedling pushing spring 51, damage and wear of the seedling pushing spring can be suppressed, and the durability of the seedling planting tool can be improved. The supply port cap 57 can also be used as a positioning member for the seedling pushing spring 51.
[0008]
  Further, when the seedling planting tool 32 scrapes off the seedling, the seedling extruding surface of the seedling extruding body 42 comes into contact with the seedbed before the upper side, and when the seedling planting tool 32 plants the seedling, the seedling extruding surface is the front side. The rear end of the notch 41d of the planting claw 41 is rearward of the front end of the seedling extrudate 42 immediately before the seedling extruding body 42 pushes out to inject the seedling planting tool 32 so as to plant the seedling. Therefore, after the seedling is planted in the backward tilted posture, the seedling planting tool 32 is pushed forward to correct the seedling so that the seedling is in a vertical posture, and the seedling can be planted in an appropriate posture on the field.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0010]
  1 and 2 show a riding-type rice transplanter 1, and this riding-type rice transplanter 1 is composed of a traveling vehicle body 2 and a six-row planting part 3.
[0011]
  An engine 4 as a drive source is provided at the approximate center of the traveling vehicle body 2, and the front wheels 6, 6 and the rear wheels 7, 7 are driven by the driving of the engine 4 through the traveling mission case 5. The traveling vehicle body 2 travels by driving the wheels 6, 6, 7, 7. A cockpit 8 is provided above the engine 4, and a steering handle 9 is provided on the front side of the cockpit 8. An elevating link mechanism 10 is provided at the rear part of the traveling vehicle body 2, and the seedling planting part 3 is mounted via the elevating link mechanism 10, and is provided so as to be moved up and down by expansion and contraction of the hydraulic elevating cylinder 11. . The power from the traveling vehicle body side is transmitted to the seedling planting portion 3 through the planting clutch case 12.
[0012]
  Further, an inter-stock shift lever 13 that is operated stepwise is provided at the step portion in front of the cockpit, so that the operating speed of the seedling planting section 3 with respect to the traveling speed of the traveling vehicle body 2 can be changed. With this inter-strain shift lever 13, the planting operator can set the planting strains of seedlings to be transplanted in the field. Therefore, unless the inter-strain shift lever 13 is operated, the seedling planting unit 3 is operated at a speed proportional to the traveling speed.
[0013]
  The seedling planting unit 3 includes a seedling mounting table 20, a planting transmission unit 21, and seedling planting devices 22 for each strip. At the lower part of the seedling planting part 3, a center float 23 and side floats 24, 24 are provided on both sides, and the floats 23, 24, 24 are configured to slide in a field scene. .
[0014]
  In addition, the seedling planting unit 3 operates the seedling planting device 22 by the power from the planting transmission unit 21. The seedling mounting table 20 is supported by a seedling mounting table support rollers 25 and 25 at the upper part and a left and right movement guide plate 26 at the lower part so as to be movable left and right. Accordingly, the seedling planting unit 3 moves the seedling placement table left / right moving rod 27 to which the seedling placement table 20 is fixed to the left and right to move the seedling placement table 20 left and right. It is configured to scrape stocks one by one. The left and right moving guide plate 26 is provided with seedling scraping openings 26a of the seedling planting devices 22,. The seedling mounting table 20 has a known configuration in which mat-shaped seedlings are sequentially transferred to the seedling planting device side along the seedling mounting table 20 by the seedling feeding belts 28,.
[0015]
  The seedling planting device 22 is driven by a seedling planting device drive shaft 30 that is output from the end of the planting transmission frame 29 of the planting transmission unit 21 and rotates at a constant speed in proportion to the traveling speed of the machine body. It comes to work. The seedling planting device drive shaft 30 is driven and driven via a driven sprocket 38 and a safety clutch 39 which are driven by transmission from a chain 37 wound from the front side. The safety clutch 39 includes a drive clutch pawl 39a integrally provided at an end of the driven sprocket 38, a passive clutch pawl body 39b having a passive clutch pawl meshing with the drive clutch pawl 39a, and the driven sprocket 38. A compression spring 39c that urges the body 39b is provided. The driven sprocket 38, that is, the drive clutch pawl 39a is provided so as to rotate around the seedling planting device drive shaft 30, and the passive clutch pawl body 39b rotates integrally with the seedling planting device drive shaft 30. It has become. The claw portions of the drive clutch 39a claw and the passive clutch claw body 39b are provided with inclined surfaces, and when the seedling planting device 22 interferes with a foreign object or the like to cause a mechanical lock, the inclined surfaces resist the compression spring 39c. The drive clutch pawl 39a, that is, the driven sprocket 38 moves to the side opposite to the passive clutch pawl body 39b, and the transmission of the safety clutch 39 is cut off.
[0016]
  The seedling planting device 22 includes a rotating case 31 that rotates integrally with the seedling planting device drive shaft 30, and seedling planting tools 32 and 32 that are respectively attached to both ends of the rotating case 31. The seedling planting tools 32, 32 scrape off the seedlings on the seedling scraping opening 26a, and plant the scraped seedlings in the field. The rotating case 31 is attached so as to rotate integrally with the seedling planting device drive shaft 30 and the sun gear 33 in the rotating case 31 does not rotate with respect to the planting transmission frame 29. The intermediate gears 34, 34 that are engaged with the sun gear 33 are rotated around the sun gear 33 by rotation of the rotary case 31, and the intermediate gears 34, 34 are driven by driving the intermediate gears 34, 34. The final gears 35 and 35 that mesh with the gears are rotated. And the square shaft part of the end part of the last gear rotating shafts 36 and 36 which rotate integrally with the last gears 35 and 35 is fitted in the square hole part of the seedling planting fixture fixing member 32c of the seedling planting tool 32. The final gear rotation shaft and the seedling planting tools 32, 32 are integrally rotated, and the forward / backward inclined postures of the seedling planting tools 32, 32 are determined with respect to the rotational position of the rotary case 31. The That is, the seedling planting tool 32 rotates integrally with the final gear 35. In addition, the intermediate gears 34 and 34 and the final gears 35 and 35 are provided at symmetrical positions with respect to the sun gear 33 so as to determine the front and rear inclined postures of the respective seedling planting tools 32 and 32. Yes. The seedling planting tools 32, 32 are provided with seedling planting tool cases 32a, 32a, and the seedling planting tools case 32a is connected to the seedling planting tools 32b, 32b by two mounting bolts 32b, 32b. It is fixed to the fixing member 32c.
[0017]
  The sun gear 33, the intermediate gears 34 and 34, and the final gears 35 and 35 are non-circular eccentric gears and have the same number of teeth, respectively, and the intermediate gear 34 per rotation of the rotary case 31. , 34 and the final gears 35, 35 rotate one time while changing the rotational angular velocity. Therefore, while the rotary case 31 rotates once, the seedling planting tools 32, 32 rotate once with respect to the rotary case 31 in the direction opposite to the rotation of the rotary case 31. ing.
[0018]
  Further, a rattling stop mechanism 40 is provided in the rotary case 31 in order to absorb backlash generated by backlash in the meshing of the sun gear 33, the intermediate gear 34, and the final gear 35 in the rotary case 31. The backlash stop mechanism 40 includes a backlash stop cam 40a that rotates integrally with the final gear 35, a backlash stop arm 40b that contacts the cam 40a, and a back end stop that urges the arm 40b toward the backlash stop cam 40a. And a spring 40c. When the seedling planting device 22 scrapes off the seedling from the seedling scraping opening 26a and when the scraped seedling is planted in the field, the rattling stop mechanism 40c stops the backlash of the final gear 35 and stops the seedling planting tool 32. The seedling planting tool 32 scrapes off the seedlings accurately and accurately seeds them in the field.
[0019]
  The seedling planting tool 32 is an example of a planting claw 41 for scraping and holding a mat-like seedling and a seedling extrudate for extruding the seedling separated and held by the planting claw 41 toward a field scene. And a seedling extruding fork 42. As the rotation case 31 rotates, the seedling planting tool 32 draws a loop trajectory T and passes through the seedling scraping opening 26a, so that the planting claw 41 scrapes the seedling in the seedling scraping opening 26a. It comes to hold.
[0020]
  The planting claws 41 are fixed to the seedling planting tool case 32a by mounting bolts 43, and are provided to project downward from the upper wall portion 41a and the left and right end portions on the distal end side of the upper wall portion 41a. The left and right side wall portions 41c and 41c are provided. In addition, a notch 41d is provided from the tip of the planting claw 41 toward the base at the left and right center of the upper wall 41a. The notch portion 41d extends from the left and right side wall portions 41c, 41c to the base side of the planting claw 41, and substantially the same as the lateral width of the upper wall portion 41a at the tip of the planting claw 41. The left and right widths are reduced as they are configured in the same manner from the tip of the planting claw 41 toward the base side, and the base side has a constant left and right width from a predetermined position. Therefore, in the tip part of the planting claw 41, the upper wall part 41a and the left and right side wall parts 41c, 41c constitute a seedling holding part whose cross section is a pair of left and right L-shaped.
[0021]
  The seedling extrusion fork 42 includes a round shaft portion 42a that slides with respect to the seedling planting case 32a by an extrusion operation, and a seedling extrusion portion 42b that is fixed to the tip of the round shaft portion 42a. Composed. The seedling extruding portion 42b is provided with a seedling extruding base portion 42c and left and right seedling extruding plates 42d, 42d, and the front end portions of the seedling extruding plates 42d, 42d are on the seedling bed of the seedling held by the planting claws 41. The seedling held by the planting claw 41 is pushed out and pushed out. The left and right seedling extrusion plates 42d and 42d are provided in the vicinity of the side wall portions 41c and 41c on the left and right inner sides of the side wall portions 41c and 41c of the planting claw 41, and the upper portions of the plates 42d and 42d are side surfaces. It is provided so that it may overlap with the said side wall parts 41c and 41c of the planting nail | claw 41 by visual observation.
[0022]
  An upper portion of the seedling pushing fork 42, that is, a part of the round shaft portion 42a, is inserted into the seedling planting case 32a. In the seedling planting case 32a, a connection link 44 is connected to the upper end of the seedling push-out fork 42 via a lower support shaft 44a, and an upper support shaft 44b is connected to the connection link 44. The seedling push-out arm 45, the cam-side arm 46 provided integrally with the seedling push-out arm 45, and the seedling push-out cam 47 in contact with the cam-side arm 46. . The seedling push-out arm 45 and the cam side arm 46 swing integrally around a swing shaft 48 attached to the seedling planting case 32a. The connecting link 44 is connected to the seedling extruding fork 42 through the lower support shaft 44a. So that it hardly rotates. The seedling extrusion cam 47 is provided so as to be rotatable around the final gear rotation shafts 36, 36 of the rotary case 31, and the seedling extrusion cam 47 has an end 47a on the rotary case 31 side. The outer shape is rectangular when viewed from the side, and is inserted into the square hole 49 of the rotary case 31 so as not to rotate with respect to the rotary case 31. Therefore, the seedling pushing cam 47 is configured to rotate once relative to the seedling planting tool 32 for each rotation of the rotary case 31. Then, for each rotation of the seedling pushing cam 47 with respect to the seedling planting tool 32, the seedling pushing arm 45 swings by one reciprocation via the cam side arm 46, and the seedling pushing fork 42 takes one reciprocation. It is configured to slide. In addition, a rubber seal material 50 is provided in a portion where the seedling extrusion fork 42 slides in the seedling planting tool case 32 a, and the seedling extrusion fork 42 is provided by the seal material 50. Thus, the later-described grease (lubricant) supplied into the seedling planting tool case 32a is prevented from being taken out of the seedling planting tool case 32a.
[0023]
  A seedling extrusion spring 51 that is a compression spring is provided in contact with the upper end portion of the connection link 44. The other end of the seedling pushing spring 51 is in contact with the inner surface of the seedling planting case 32a. Further, the upper end portion of the connection link 44 constitutes a contact surface for the lower end portion of the seedling push spring 51 to contact. The seedling extruding fork 42 is biased toward the seedling extruding action side by the seedling extruding spring 51, and sliding of the seedling extruding action side to the seedling extruding action side is restricted by the seedling extruding cam 47. The slide 46 is slid by the seedling pushing spring 51 in a state where it is in contact with the small diameter portion 47b of the seedling pushing cam 47, and is pushed out. In addition, when it comes to the position of the bottom dead center A of the loop locus | trajectory T of the seedling planting tool 32, the said seedling pushing fork 42 is pushed out. Then, the seedling pushing fork 42 that has been pushed out by the time the seedling planting tool 32 rises from the position of the bottom dead center A and reaches the position of the seedling scraping opening 26a returns, and the planting claws 41 scrape the seedling. The seedling extruding fork 42 returns and operates until it is removed. A cushion rubber 52 that abuts the seedling extrusion arm 45 when the seedling extrusion fork 42 is pushed out is provided in the seedling planting case 32a. It is configured to mitigate the impact of the pushing operation of the seedling pushing fork 42 due to the above.
[0024]
  Then, the compression direction of the seedling extrusion spring 51 and the sliding direction of the seedling extrusion fork 42 are the same direction, and the extension line of the shaft center of the round shaft portion 42 a of the seedling extrusion fork 42 corresponds to the seedling extrusion spring 51. The positional relationship passes through the inner diameter portion 53. Accordingly, the spring force of the seedling pushing spring 51 can be prevented from acting on the seedling pushing fork 42 in a direction intersecting the sliding direction of the fork 42, and the seedling pushing fork 42 can be made smooth. The sliding of the seal material 50 provided at the sliding portion of the seedling extrusion fork 42 and the sliding portion of the round shaft portion 42a of the seedling extrusion fork 42 can be suppressed.
[0025]
  Incidentally, a lubricant supply port 56 is provided at the upper end of the seedling planting case 32a on the upper side of the seedling pushing spring 51. The grease is supplied into the seedling planting tool case 32a by inserting a discharge port for discharging the grease as the lubricant into the seedling planting tool case 32a from the lubricant supply port 56. It has become. By the grease supplied into the seedling planting case 32a, the seedling extruding fork 42, the seedling extruding spring 51, the connecting link 44, the seedling extruding arm 45, the cam side arm 46 and the seedling extruding cam 47 are provided. The constituent members for sliding the seedling extruding fork 42 in the seedling planting case 32a are lubricated to smoothly operate these constituent members and suppress wear of these constituent members. It has become. The lubricant supply port 56 has a diameter smaller than the inner diameter of the seedling push spring 51.
[0026]
  The lubricant supply port 56 is provided with a supply port cap 57 for closing the supply port 56 so that the grease in the seedling planting case 32a does not jump out of the lubricant supply port 56. Yes. The supply port cap 57 is made of rubber, and includes a large-diameter portion 57a having a diameter larger than that of the lubricant supply port 56, and a small-diameter portion 57b having the same outer diameter as the lubricant supply port 56, and the small-diameter portion 57b. Is inserted into the lubricant supply port 56 to close the lubricant supply port 56. The small-diameter portion 57 b is provided with a cavity on the inside, and is configured to be easily bent in the radial direction and to be easily fitted into the lubricant supply port 56. The small diameter portion 57b is slightly smaller in diameter than the inner diameter of the seedling pushing spring 51, and is inserted into the inner diameter portion 53 of the seedling pushing spring 51 when the supply port cap 57 is attached as shown in FIG. .
[0027]
  As described above, the seedling planting tool 32 is rotated by the rotation of the rotary case 31 and swung along the loop trajectory T in the vertical direction, and is planted by the planting claw 41 from the seedling scraping opening 26a below the seedling mounting table 20. Minute seedlings are scraped off and the scraped seedlings are transferred to the field scene, and the seedling extrusion fork 42 slides to push the seedlings into the field and plant them. When scraping off a single seedling, the leaves of the seedling extending upward from the seedbed enter the notch 41d of the planting claw 41 and the upper wall 41a and the left and right side walls 41c of the tip of the planting claw 41, 41c holds the seedbed for one strain on the seedling planting tool 32, and securely holds the seedbed so that the seedbed of the seedling to be transferred to the field scene does not separate. In addition, the seedlings held by the seedling planting tool 32 are surely brought into the field by the pushing operation of the seedling pushing plates 42d and 42d of the seedling pushing fork 42 in the vicinity of the left and right inner sides of the left and right side wall portions 41c and 41c. To be planted.
[0028]
  The seedling planting tool 32 has a configuration in which a part of the round shaft portion 42a of the seedling extrusion fork 42 is provided in the seedling planting case 32a. A lubricant supply port 56 for supplying grease as a lubricant into the case 32a is provided at the upper end portion of the upper seedling planting tool case 32a.
[0029]
  Therefore, since the lubricant supply port 56 is provided above the seedling extrusion fork 42, the grease is supplied from the lubricant supply port 56 to the vicinity of the seedling extrusion fork 42 in the seedling planting case 32a. In addition to suppressing the wear of the sliding portion of the round shaft portion 42a of the sliding seedling extruding fork 42, the sliding of the seedling extruding fork 42 causes the grease to form the seedling planting tool case. Thus, the seedling extruding fork 42 can slide properly and smoothly over a long period of time.
[0030]
  In addition, the seedling planting tool 32 includes a seedling planting tool case in which a part of the round shaft portion 42a of the seedling pushing fork 42 and a seedling pushing spring 51 for sliding the seedling pushing fork 42 are provided. The case 32a is configured to supply grease, which is a lubricant, into the case 32a to the upper end portion of the seedling planting case 32a near the upper end of the seedling pushing spring 51. A lubricant supply port 56 is provided.
[0031]
  Therefore, since the lubricant supply port 56 is provided near the seedling pushing spring 51, the seedling pushing spring 51 is likely to be damaged and worn due to bending and repeated deformation due to sliding of the seedling pushing fork 42. It can supply, the damage and abrasion of the said seedling pushing spring 51 can be suppressed, and the durability, ie, lifetime, of the seedling planting tool 32 can be improved.
[0032]
  The seedling planting tool 32 is provided with a supply port cap 57 for closing the lubricant supply port 56, and when the supply port cap 57 is attached to the lubricant supply port 56, the supply port cap 57 is provided. The small diameter portion 57b is inserted into the inner diameter portion 53 of the seedling push spring 51.
[0033]
  Therefore, since at least a part 57 b of the supply port cap 57 attached to the lubricant supply port 56 is inserted into the inner diameter portion 53 of the seedling extrusion spring 51, the lubricant supply port 56 is close to the seedling extrusion spring 51. It can be arranged, grease can be accurately supplied to the seedling extrusion spring 51, damage and wear of the seedling extrusion spring 51 can be suppressed, and the durability, that is, the life of the seedling applicator 32 is improved. be able to. The supply port cap 57 can also be used as a positioning member in a direction intersecting the sliding direction of the seedling pushing fork 42 of the seedling pushing spring 51.
[0034]
  By the way, when the traveling speed of the aircraft is increased to improve the planting work efficiency, immediately after planting the seedling with the seedling planting tool 32, the seedling planting tool 32 comes to rise while pushing it forward. There is a possibility that the planting posture of the planted seedling becomes a forward leaning posture. However, as shown in FIG. 7, the end faces of the seedling extrusion plates 42d and 42d, which are the seedling extrusion surfaces of the seedling extrusion fork 42 that has been pushed to plant seedlings at the bottom dead center A, are as shown in FIG. It will be in the state which inclined to the front rise with respect to the horizontal surface. Thereby, when the seedling pushing fork 42 is pushed out at the bottom dead center A of the operation trajectory T of the seedling planting tool 32 and the seedling is planted, the seedling is planted in a slightly inclined posture. When the attachment 32 pushes the seedling forward, the seedling is corrected so as to have a vertical posture, and the seedling can be planted in an appropriate posture in the field. When the seedling planting tool 32 scrapes off the seedlings at the seedling scraping opening 26a, the end surfaces of the seedling extrusion plates 42d and 42d, which are the seedling extrusion surfaces of the seedling extrusion fork 42, are seedlings on the seedling scraping opening 26a. Since the base plate is inclined so that the lower side of the end faces of the seedling extruding plates 42d and 42d is in contact with the seedbed before the upper side, it is parallel to the front and rear inclination of the left and right moving guide plate 26. At the time of picking, the seedling is held in the seedling planting tool 32 in a backward tilting posture, and the seedling can be planted in the backward tilting posture at the bottom dead center A of the operation locus T. Therefore, when the seedling planting tool 32 is pushed forward immediately after the seedling planted in the backward tilted posture, the seedling is corrected so as to have a vertical posture, and the seedling is planted in a proper posture in the field. be able to.
[0035]
  It should be noted that the rear end of the notch 41d of the planting claw 41 is located at the bottom of the seedling pushing fork 42 just before the seedling pushing fork 42 is pushed to plant the seedling at the bottom dead center A. Since it is in the rear position from the front end, it can be in a backward tilted position immediately before planting the seedlings held by the planting claws 41. Then, when the seedling pushing fork 42 is pushed out, the seedling pushing fork 42 is pushed forward and slightly tilted forward, so that the seedbed is pushed forward slightly and the seedling is planted in a tilted posture. Can do. Therefore, when the seedling planting tool 32 is pushed forward immediately after the seedling planted in the backward tilted posture, the seedling is corrected so as to have a vertical posture, and the seedling is planted in a proper posture in the field. be able to.
[0036]
  In addition, if there is a foreign matter or the like in the seedling scraping opening 26a and interferes with the seedling planting tool 32, a safety clutch 39 provided on the seedling planting device drive shaft 30 is provided to prevent mechanical locking in driving the seedling planting device 22. Actuates and cuts off the transmission of the seedling planting device 22. At this time, since the drive of the seedling planting device 22 that has been continuously operated by the rotation of the rotary case 31 is suddenly stopped, the backlash stopping mechanism 40 in the rotary case 31 is also acting. Then, the impact of stopping the driving of the seedling planting device 22 is transmitted to the seedling planting tool 32, and the mounting bolts 32b, 32b for fixing the seedling planting tool case 32a to the seedling planting tool fixing member 32c are provided. As a result, the operation of the seedling planting tool 32 becomes unstable and the seedling may not be planted properly. However, as shown in FIG. 7, when the tip of the seedling planting tool 32 is at the position of the seedling scraping opening 26a, two seedling planting tool cases 32a are fixed to the seedling planting tool fixing member 32c. Since both the mounting bolts 32b and 32b are located in front of the final gear rotation shaft 36, even if the seedling planting device 22 suddenly stops due to the operation of the safety clutch 39, the seedling planting tool 32 rotates as shown in FIG. When the two mounting bolts 32b and 32b are about to rotate upward around the final gear rotation shaft 36 due to transmission in the rotation case 31 because they rotate clockwise with respect to the case 31. Will stop. Therefore, even if the tip of the seedling planting tool 32 is at the position of the seedling scraping opening 26a by the operation of the safety clutch 39, the weight of the seedling planting tool 32 is the same with the two mounting bolts 32b and 32b. Since the driving force of the seedling planting device 22 is transmitted in the opposite direction, the two mounting bolts 32b and 32b are less likely to loosen. Therefore, when the seedling planting is resumed, it is possible to prevent the operation of the seedling planting tool 32 from becoming unstable and preventing the seedling from being properly planted.
[0037]
  When one seedling planting tool 32 is at the position of the seedling scraping opening 26a, the other seedling planting tool 32 provided on the opposite side of the rotating case 31 is the bottom dead center A of the operation locus T for planting the seedling. Located in the vicinity. At this time, also in the other seedling planting tool 32, the two mounting bolts 32b and 32b for fixing the seedling planting tool case 32a to the seedling planting tool fixing member 32c are both the final gear rotation shaft. 36, the two mounting bolts 32b and 32b are not easily loosened even if the seedling planting device 22 is suddenly stopped by the operation of the safety clutch 39. It can suppress that the operation | movement of the planting tool 32 becomes unstable and it becomes impossible to plant a seedling appropriately. Further, when the seedling planting tool 32 is planting a seedling near the bottom dead center A of the operation trajectory T, the safety clutch 39 is activated by the presence of a foreign object such as a stone in the field and interfering with the seedling planting tool 32. Even if the planting device 22 stops suddenly, both the two mounting bolts 32b and 32b are located on the front side of the final gear rotation shaft 36. When the planting of the seedling is resumed, the operation of the seedling planting tool 32 becomes unstable and the seedling cannot be properly planted.
[0038]
  The embodiment of the present invention has been described with respect to the riding type rice transplanter 1. However, the present invention is not limited to the riding type rice transplanter.
  Similarly, although the embodiment of the above invention described the seedling planting apparatus 22 provided with the rotary case 31, the present invention is not limited to this.
[Brief description of the drawings]
FIG. 1 is a side view showing a riding type rice transplanter.
FIG. 2 is a plan view showing a riding type rice transplanter.
FIG. 3 is a cross-sectional plan view showing a transmission configuration to a seedling planting device drive shaft
FIG. 4 is a partial cross-sectional view showing a seedling planting apparatus.
FIG. 5 is a partial sectional side view showing a seedling planting apparatus.
FIG. 6 is a side sectional view of a rotating case.
FIG. 7 is a side view showing a seedling planting tool at the time of seedling scraping and seedling planting.
[Explanation of symbols]
20 ... Seedling mount,30 ... Seedling planting device drive shaft, 31 ... Rotating case,32 ... Seedling planting tool, 32a ... Seedling planting tool case, 41 ... Planting nail,41d ... Notch,42 ... seedling extrusion fork, 51 ... seedling extrusion spring, 53 ... inner diameter portion of seedling extrusion spring, 56 ... lubricant supply port, 57 ... supply port cap, 57b ... small diameter portion of supply port cap

Claims (1)

苗植付装置駆動軸(30)と一体回転する回転ケース(31)を設け、該回転ケース(31)の端部に苗植付具(32)を回転ケース(31)に対して逆方向に回転するように装着し、前記苗植付具(32)は、苗載置台(20)上のマット状の苗から一株分の苗を掻き取る植付爪(41)と該植付爪(41)が掻き取った苗を押し出すべく摺動する苗押出体(42)とを備え、前記植付爪(41)の先端部には基部側に向かう切欠き部(41d)を設け、前記苗押出体(42)の一部と該苗押出体(42)を摺動させるための苗押出スプリング(51)とをケ−ス(32a)内に設け、前記苗押出体(42)より上位で且つ前記苗押出スプリング(51)の近くに前記ケ−ス(32a)内に潤滑剤を供給するための潤滑剤供給口(56)を設け、該潤滑剤供給口(56)を閉塞するための供給口キャップ(57)を設けると共に、該供給口キャップ(57)を前記潤滑剤供給口(56)に装着したとき、前記供給口キャップ(57)の少なくとも一部(57b)が苗押出スプリング(51)の内径部(53)に挿入される構成とし、苗植付具(32)が苗を掻き取るとき苗押出体(42)の苗押出面はその下側が上側より先に苗床に接触し、苗植付具(32)が苗を植え付けるとき前記苗押出面は前上がりとなるよう傾斜し、苗植付具(32)が苗を植え付けるべく苗押出体(42)が押出作動する直前において植付爪(41)の切欠き部(41d)の後端が苗押出体(42)の前端より後位となる田植機。  A rotating case (31) that rotates integrally with the seedling planting device drive shaft (30) is provided, and the seedling planting tool (32) is placed in the opposite direction to the rotating case (31) at the end of the rotating case (31). The seedling planting tool (32) is mounted so as to rotate. The seedling planting tool (32) has a planting claw (41) for scraping off one seedling from a mat-like seedling on the seedling mounting table (20) and the planting claw ( 41) and a seedling extrudate (42) that slides to extrude the scraped seedling, and a notch (41d) toward the base side is provided at the tip of the planting claw (41). A part of the extrudate (42) and a seedling extruding spring (51) for sliding the seedling extrudate (42) are provided in the case (32a) above the seedling extrudate (42). A lubricant supply port (56) for supplying a lubricant into the case (32a) is provided near the seedling pushing spring (51). The supply port cap (57) for closing the lubricant supply port (56) is provided, and when the supply port cap (57) is attached to the lubricant supply port (56), the supply port cap is provided. At least a part (57b) of (57) is configured to be inserted into the inner diameter part (53) of the seedling extrusion spring (51), and when the seedling planting tool (32) scrapes off the seedling, the seedling extrudate (42) The lower side of the seedling extruding surface comes into contact with the seedbed before the upper side, and when the seedling planting tool (32) plants a seedling, the seedling extruding surface is inclined so as to rise forward, and the seedling planting tool (32) A rice transplanter in which the rear end of the notch (41d) of the planting claw (41) is located behind the front end of the seedling extrudate (42) immediately before the seedling extrudate (42) is pushed out.
JP2000086660A 2000-03-27 2000-03-27 Rice transplanter Expired - Fee Related JP3818009B2 (en)

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JP2000086660A JP3818009B2 (en) 2000-03-27 2000-03-27 Rice transplanter

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JP2000086660A JP3818009B2 (en) 2000-03-27 2000-03-27 Rice transplanter

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