JPS6029444B2 - Wet field work machine - Google Patents

Description

【発明の詳細な説明】 本発明は、たとえば乗用トラクタに苗楯付装置等の槌込
み装置を着脱自在にかつ駆動装置によりレベル調整自在
に設けると共に、前記楯込み装置の上下揺動可能フロー
トと前記駆動装置の制御機構とを、フロートの俺仰角を
設定範囲に自動的に総持すべく、解除自在に連係させた
乗用型田植機等の湿由作業機に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a driving device such as a seedling shield attaching device that is detachably attached to a riding tractor and whose level can be freely adjusted by a drive device, and a vertically swingable float of the shield device. The present invention relates to a wet working machine such as a riding type rice transplanter, in which the control mechanism of the drive device is releasably linked to automatically maintain the elevation angle of the float within a set range.

この種のものでは、耕盤レベルに変動があっても、楢込
み装置の田面に対するレベルを一定化するために、耕盤
レベルに追随しながら植込み装置を自動的に昇降制御で
きるようにすると共に、樋込み終端での回行時に、不用
意に植込み装置を引きずり、楯込んだ苗等の槌込み物を
倒したり由面を荒らしたりする問題を確実に回避できる
ように、人為的には強制的な上昇操作のみ行えるように
することが要求されている。With this type of device, in order to maintain a constant level of the planting device relative to the field surface even if the level of the tiller changes, the planting device can be automatically raised and lowered while following the level of the tiller. , to avoid the problem of inadvertently dragging the planting device when turning around at the end of the trough, knocking over things that are being hammered in, such as shielded seedlings, or damaging the surface of the slope. It is required that only manual lifting operations can be performed.

他方、この種のトラクタに、植込み装置に代えて、ロー
タリー耕転装置がプラウ等の作業装置を付設する場合、
耕深調節等のために、人為的に作業装置を昇降両操作で
きるようにすることが要求されている。本発明は、上記
の点に鑑み、トラクタに楯込み装置を連結する場合と、
連結解除する場合、換言すれば他装置を連結する場合と
で異なる上述要求を簡単な構造でもつて満たせるように
することを目的とするもので、この目的を達成するため
の具体的な技術手段は、冒頭に記した如き湿田作業機に
おいて、楯込み装置の昇降を司る駆動装置の制御機構の
制御バルブに、相対回転自在な内外二重軸を支承し、外
軸には操作レバーとスプール操作アームを固着すると共
に、内軸には、回転部材とスプール操作フオークを固着
し、前記スブール操作アームは、スプールに上昇操作方
向時にのみ接当押圧可能に配置すると共に、スブール操
作フオークは前記スプールに正逆し、ずれの操作方向に
も係合できすように構成し、前記回転部村には、一端が
前記フロートに連結されていて該フロートの上下動を伝
達するための連繋臭の他端を係脱できるように構成した
連結部材を装着すると共に、該連結部材を、連繋臭と係
合して前記回転部材と−体作動可能となる作用姿勢と、
連繋具との係合を解除して操作レバーに係合し回転部材
とこの操作レバーとを一体作動可能とする作用姿勢とに
、切換え自在に構成した点にある。On the other hand, when a rotary tillage device is attached to this type of tractor in place of a planting device and a working device such as a plow,
In order to adjust the plowing depth, etc., it is required to be able to manually raise and lower the working device. In view of the above points, the present invention provides a case where a shielding device is connected to a tractor,
The purpose of this is to satisfy the above-mentioned requirements, which are different when disconnecting devices, or in other words, when connecting other devices, with a simple structure, and the specific technical means for achieving this purpose are as follows. In the wet field work machine as described at the beginning, the control valve of the control mechanism of the drive device that controls the raising and lowering of the shielding device supports an inner and outer double shaft that can rotate freely, and the outer shaft has an operating lever and a spool operating arm. At the same time, a rotating member and a spool operating fork are fixed to the inner shaft, and the subur operating arm is arranged so as to be able to contact and press the spool only in the upward operating direction, and the subur operating fork is attached to the spool in the correct direction. On the other hand, the rotary part is configured so that it can be engaged in the operating direction of the shift, and the rotary part has one end connected to the float and the other end of the rotary part connected to the float for transmitting the vertical movement of the float. a working position in which a connecting member configured to be engageable and detachable is attached, and the connecting member is engaged with the connecting member so as to be able to move with the rotating member;
The rotary member is configured to be able to be freely switched to an operating position in which the rotary member is disengaged from the connecting member and engaged with the operating lever so that the rotating member and the operating lever can be operated integrally.

従って、植込み作業では、連結部材に連繋臭を係合して
回転部村と一体作動可能にしておけば、耕盤レベルの変
動によってフロートが上下動し、これを連繋臭を介して
回転部材を正逆方向に作動させるためスプールが正逆方
向に切換えられて、耕盤レベルに応じて楯込み装置を自
動的に適正な高さ位置に修正してくれると共に、棺込み
作業工程の終端では、単に操作レバーを操作するだけで
、楯込み装置を人為的、強制的に上昇させて不用意に田
面をひきづり回すことがない。Therefore, in planting work, if the connecting member is engaged with the connecting member so that it can operate integrally with the rotating part, the float will move up and down due to fluctuations in the level of the tiller, and this will cause the rotating member to be connected to the connecting member through the connecting member. In order to operate in the forward and reverse directions, the spool is switched between forward and reverse directions, and the shielding device is automatically adjusted to the appropriate height position according to the level of the tiller. By simply operating the operating lever, there is no need to artificially or forcibly raise the shielding device and unintentionally drag the field.

そして楯込み装置に代えて、ロータリー耕転装置がプラ
ウ等の作業装置を装着した場合には、連繋具を連結部材
から外しこの連結部村を操作レバーに係合して回転部材
と該操作レバーとを一体作動可能とすることで、操作レ
バーを人為的に操作しさえすれば、回転部材を介してス
プールを正逆操作でき前記作業装置を人為的に昇降する
ことができ、もって所期の目的を達成できるに至った。
そして本発明は、楯込み装置を装着した状態での自動制
御と耕転装置等を装着した状態での手動制御とを、単に
連結部材の切換え操作で現出できるので、自動手動の切
換え操作が非常に簡単となる上に、回転部材と連繋具と
を連結する都材、つまり連結部材を操作レバーと回転部
材とを連結するための部材に兼用してあると共に、操作
レバー、スプール操作アーム、そして回転部材、スプー
ル操作フオークを制御バルブの内外二重軸に装着してあ
るために、構造の簡素化とコンパクト化とを一挙に図る
ことができ、しかも操作レバー並びに回転部材、連結部
材を制御バルブの一側にまとめて配談できるために制御
バルブの取付箇所に制約をうけずどこにでも取付け易い
利点がある。If the rotary tilling device is equipped with a plow or other working device instead of the shielding device, the connecting tool is removed from the connecting member, and the connecting portion is engaged with the operating lever to connect the rotating member and the operating lever. By making it possible to integrally operate the spool and the operating lever, the spool can be operated in the forward and reverse directions via the rotating member, and the working device can be raised and lowered manually, thereby making it possible to manually operate the operating lever. I was able to achieve my goal.
In addition, the present invention enables automatic control when the shielding device is installed and manual control when the tillage device is installed by simply switching the connecting member, so that the switching operation between automatic and manual is easy. In addition to being very simple, the connecting member that connects the rotating member and the connecting member is also used as a member that connects the operating lever and the rotating member, and the operating lever, spool operating arm, Since the rotating member and spool operating fork are attached to the dual inner and outer shafts of the control valve, the structure can be simplified and compacted all at once, and the operating lever, rotating member, and connecting member can be controlled. Since all control valves can be installed on one side of the valve, there is no restriction on where the control valve can be installed, and it has the advantage of being easy to install anywhere.

次に、本発明を乗用型の田植機に採用した場合を図面に
基づいて詳述する。トラクタ１の後部に６条植えの苗槽
装置２が昇降自在に枢支連結され、機体横方向に往復移
動する苗敷燈台３から、６組の苗槽付機４・・で所定量
の苗ブロックを取出して田圃に楯付けてゆくべく構成さ
れており、もって、走行に伴って田圃に苗を連続的に楯
付けてゆくべく乗用型田植機が構成されている。Next, a case in which the present invention is applied to a riding type rice transplanter will be described in detail based on the drawings. A seedling tank device 2 for planting six rows is pivotally connected to the rear of the tractor 1 so as to be able to rise and fall freely, and a predetermined amount of seedlings are harvested from a seedling lighthouse 3 that moves back and forth in the lateral direction of the tractor by six sets of seedling tank attachers 4. The riding-type rice transplanter is configured to take out blocks and attach them to the rice field as a shield, and thereby to continuously attach seedlings to the rice field as it travels.

前記苗桶装置２に楯付ケース５には、左右一対のロアー
リンク６，６及びアッパーリンク７，７が同芯に枢着さ
れ、前記ロアーリンク６，６の前端がトラクターの後部
ヒッチ８に枢支連結されると共に、アッパーリンク７，
７の前端がトラクタ１の後部ミッションケース９の上部
に設けたアタッチメント昇降用の油圧駆動式のＩＪフト
アーム１０，１０１こピン連結され、もって、前記ＩＪ
フトアーム１０，１０の上下揺動に伴って苗樋装置２が
ロァーリンク６，６の前端枢支点Ｑを中心に揺動昇降す
るべく構成されている。A pair of left and right lower links 6, 6 and upper links 7, 7 are concentrically pivotally connected to the shield case 5 of the seedling pail device 2, and the front ends of the lower links 6, 6 are connected to the rear hitch 8 of the tractor. The upper link 7,
The front end of the IJ foot arm 7 is connected with a pin to a hydraulically driven IJ foot arm 10, 101 for raising and lowering an attachment provided on the upper part of the rear transmission case 9 of the tractor 1.
The seedling gutter device 2 is configured to swing up and down around the front end pivot point Q of the lower links 6, 6 as the foot arms 10, 10 swing up and down.

前記苗楯装置２の上部には合成樹脂からなる４個の中空
フロート状整地体１１が並置されると共に、その前方側
、後車輪１２との間に苗楯装置２の横幅ほぼ全幅にわた
らせて常時接地側に付勢した波板１３が設けられ、もっ
て、車輪１２の跡や田園の凹凸を波板１３で均平化した
後、整地体１１・・で檀付田面を整地していくよう構成
されている。Four hollow float-like ground leveling bodies 11 made of synthetic resin are juxtaposed on the upper part of the seedling shielding device 2, and on the front side thereof, between the rear wheels 12 and the rear wheels 12, almost the entire width of the seedling shielding device 2 is disposed. A corrugated plate 13 is provided which is always biased toward the ground contact side, and after leveling the marks of the wheels 12 and unevenness in the countryside with the corrugated plate 13, the land leveling body 11... is used to level the rice field with trees. It is configured.

前記整地体１１・・は、その長さ方向中間部において、
楯付ケース５の後部に同芯状に並置本区支されたアーム
１４・・にブラケツト１５・・を介して枢着されると共
に、楢付ケース５の前部に回動固定可能に構架支承した
支軸１６に並瞳突設したアーム１７・・に屈折リンク１
８・・を介して各整地体１１・・の前端近くが枢支連結
されており、苗才直装置２と田面との才直付距離の変化
に応じて各整地体１１・・が中間枢支点Ｐ・・を中心に
して上下揺動できるように構成されている。The ground leveling body 11... has, in its longitudinal intermediate portion,
It is pivotally connected via a bracket 15 to an arm 14 which is supported concentrically in parallel to the rear of the case 5 with a shield, and is rotatably fixed to the front part of the case 5 with a shield. A refractive link 1 is attached to an arm 17 with a parallel pupil protruding from the support shaft 16.
Near the front end of each earth leveling body 11... is pivotally connected via 8..., and each earth leveling body 11... is connected to the intermediate pivot according to the change in the direct attachment distance between the seedling straightening device 2 and the rice field. It is configured to be able to swing up and down about a fulcrum P.

前記両アーム１４・・，１７・・は、リンク１９・・で
連結され、支軸１６を回動議節してアーム１４・・を揺
動して整地体１１・・の中間枢支点Ｐを樋付ケース５に
対して上下に位置変更して植付深さの調節が行えるよう
に構成されている。又、前記整地体１１・・の前記ブラ
ケット１５・・にも上下方向に複数の枢支連結孔２０・
・が穿設されており、アーム１４・・とブラケット１５
・・との連結位置変更によっても楯付深さの調節が行え
るように構成してある。前記整地体１ １・・のうちの
ひとつが苗楯装置２と田面との相対距離を検出するセン
サーとして作動し、この検出結果に基づいて苗桶装置２
を自動昇降制御すべ〈制御機構２１を構成してあり、以
下に説明する。The arms 14..., 17... are connected by a link 19..., and the pivot shaft 16 is rotated to swing the arms 14... to move the intermediate pivot point P of the ground leveling body 11... to the gutter. It is configured so that the planting depth can be adjusted by changing the position up and down with respect to the attached case 5. Further, the brackets 15 of the ground leveling bodies 11 are also provided with a plurality of pivot connection holes 20 in the vertical direction.
・ is drilled, and the arm 14... and the bracket 15
It is configured so that the depth of the shield can be adjusted by changing the connection position with... One of the ground leveling bodies 11... operates as a sensor that detects the relative distance between the seedling shield device 2 and the rice field, and based on this detection result, the seedling tray device 2
A control mechanism 21 is configured to automatically control the elevation and descent, and will be explained below.

つまり、前記ブラケット１５は、前記アーム１４に枢支
されたＬ型アーム２２の一端に枢支され、Ｌ型アーム２
２の他端に引っ張りスプリング２３が介装され、前記Ｌ
型アーム２２が常時下方に向けて揺動するべく付勢され
、整地体１１の接地圧変化に応じてＬ型アーム２２が揺
動するように構成されている。That is, the bracket 15 is pivotally supported on one end of the L-shaped arm 22 that is pivotally supported by the arm 14, and
A tension spring 23 is interposed at the other end of the L
The type arm 22 is always urged to swing downward, and the L-shaped arm 22 is configured to swing in response to changes in the ground pressure of the ground leveling body 11.

前記Ｌ型アーム２２の他端には、レリーズワイヤ２４の
インナーワイヤ２４ａの一端が連結されるとともに、レ
リーズワィャ２４のアウターワイャ２４ｂの一端がアー
ム１４とりンク１９の連結部に支持され、他方、インナ
ーワイヤ２４ａの他端が、前記リフトアーム１０を駆動
昇降する単動式の油圧シリンダ２５に対する制御バルブ
２６に運動連結の回転部材２７に連結されるとともに、
前記アウターワィャ２４ｂの池端が、フローティング制
御装置２８に、その装置を変更及び固定自在に連結され
ていて、前記Ｌ型アーム２２の揺動変位がしリーズワィ
ャ２４を介してフィードバックされて前記回転部材２７
に伝達され、バルブ２６を作動し、苗槽装置２を自動的
に昇降制御し、楢付深さを一定化できるように構成され
ている。前記制御バルブ２６には、内外二重軸２９，３
０が横架支承され、外軸３川こは操作レバー３１とスプ
ール操作アーム３２が固着されると共に、内軸２９には
、前記回転部材２７とスプール操作フオーク３３が固着
されている。One end of an inner wire 24a of a release wire 24 is connected to the other end of the L-shaped arm 22, and one end of an outer wire 24b of the release wire 24 is supported by a connecting portion between the arm 14 and the link 19. The other end of 24a is connected to a rotating member 27 that is movably connected to a control valve 26 for a single-acting hydraulic cylinder 25 that drives the lift arm 10 up and down;
The end of the outer wire 24b is connected to a floating control device 28 so that the device can be changed and fixed, and the swinging displacement of the L-shaped arm 22 is fed back via the lead wire 24 to control the rotating member 27.
It is configured such that the seedling tank device 2 is automatically controlled to move up and down by operating the valve 26 and the seedling tank device 2 is automatically controlled to move up and down, thereby making it possible to make the depth of raking constant. The control valve 26 includes inner and outer double shafts 29, 3.
0 is horizontally supported, and the outer shaft 3 has an operating lever 31 and a spool operating arm 32 fixed to it, and the inner shaft 29 has the rotating member 27 and a spool operating fork 33 fixed to it.

前記スプール操作アーム３２は、スププール３４の先端
ピン３５に上昇操作方向時にのみ薮当押圧可能に配置さ
れると共に、スプール操作フオーク３３は前記ピン３５
に正逆操作可能に係合されている。又、バルブ２６には
、中立位置にあるスプール操作アーム３２に係合して操
作レバー３１の中立姿勢を保持するスプリングポール３
６が装備されており、路上走行時等、苗楯装置２を上昇
させた状態でロックアーム（図外）を介して固定した時
に、前記操作レバー３１が中立姿勢から不測に外れない
ように構成してある。The spool operation arm 32 is arranged so as to be able to press against the tip pin 35 of the spool 34 only in the upward operation direction, and the spool operation fork 33 is arranged to press against the tip pin 35 of the spool 34.
It is engaged so that it can be operated in forward and reverse directions. Further, the valve 26 has a spring pawl 3 that engages with the spool operating arm 32 in the neutral position to maintain the neutral position of the operating lever 31.
6, and is configured to prevent the operating lever 31 from accidentally coming off from the neutral position when the seedling shield device 2 is fixed via a lock arm (not shown) in an elevated state, such as when driving on the road. It has been done.

尚、苗才直作業時には、前記操作レバー３１を苗植装置
２下降側の操作限度にまで揺動し、その状態で前記スプ
リングボール３６の押圧力で位置保持し、接地圧変動に
伴ってスプール３４が昇降両側に移動して苗楯装置２が
昇降制御されるように構成されている。前記回転部村２
７の所定箇所には、第３図及び第４図に示すように、前
記インナーワイヤ２４ａの他端を蜜止するための突起３
７が突談されると共に、前記突起３７にインナーワイヤ
２４ａを係止した状態で抜止めするためのダルマ型の連
結部材３８が揺動自在に設けられている。前記連結部材
３８には、トッグルバネ（図外）を介装してあり、前記
インナーワイヤ２４ａを係止する状態及びインナーワイ
ヤ２４ａの係止解除を許容する状態夫々の状態を付勢維
持できるように構成してある。In addition, during direct seedling work, the operating lever 31 is swung to the operating limit on the lowering side of the seedling planting device 2, and in this state, the position is maintained by the pressing force of the spring ball 36, and the spool is moved as the ground pressure changes. The seedling shield device 2 is controlled to rise and fall by moving the seedling shield device 34 to both sides. Said rotating club village 2
As shown in FIGS. 3 and 4, a projection 3 is provided at a predetermined location of 7 for fastening the other end of the inner wire 24a.
7 is butted, and a daruma-shaped connecting member 38 is swingably provided to prevent the inner wire 24a from coming off while being locked to the protrusion 37. A toggle spring (not shown) is interposed in the connecting member 38 so as to be able to maintain the state in which the inner wire 24a is locked and the state in which the inner wire 24a is allowed to be released. It is configured.

前記操作レバー３１の所定箇所には、中立姿勢にある時
、前記連結部材３８を、上述連結解除状態に揺動される
に伴って係合する係合部材３９を一体達設し、連結部材
３８を係合部材３９に係合した状態で前記回転部材２７
と操作レバー３１とが一体連結され、操作レバー３１で
制御機構２１を昇降両側に操作できるように構成されて
おり、苗橘装置２に代えて、ロータリ−耕泰装置、プラ
ウ、モアー、あるいはトレンチャー等の作業装置を付設
して作業する場合に、それら作業装置を人為的に昇降制
御操作できるように構成されている。An engaging member 39 is integrally provided at a predetermined location of the operating lever 31 to engage the connecting member 38 when the connecting member 38 is swung to the uncoupled state when the lever 31 is in the neutral position. The rotating member 27 is engaged with the engaging member 39.
and an operating lever 31 are integrally connected, and the control mechanism 21 is configured to be able to be operated both upward and downward by the operating lever 31, and instead of the seedling device 2, it can be used with a rotary tiller, plow, mower, or trencher. When working with working devices such as the above, the construction is such that the lifting and lowering of these working devices can be controlled manually.

尚、前記リフトアーム１川こ付設の作業装置を駆動昇降
するのに、油圧シリンダ２５に限らず、その他各種の駆
動装置２５が適用できるものである。In addition, in order to drive and lower the working device equipped with the lift arm 1, not only the hydraulic cylinder 25 but also various other drive devices 25 can be applied.

前記制御機構２１を人為的に操作する操作レバー３１、
外軸３０及びスプール操作アーム３２をして人為的操作
具４１と総称する。an operating lever 31 for manually operating the control mechanism 21;
The outer shaft 30 and the spool operating arm 32 are collectively referred to as an artificial operating tool 41.

【図面の簡単な説明】[Brief explanation of drawings]

図面は本発明に係る湿由作業機の実施例を示し、第１図
は乗用型田植機の全体側面図、第２図は要部の側面図、
第３図は制御機構を示す概略側面図、第４図は要部の一
部切欠背面図、第５図は第４図のＶ−Ｖ線失視図である
。 １・・・…車体、２・・・…楯込み装置、１１・・・・
・・フロート、２１・・・・・・制御機構、２４・・・
・・・連繋臭、２５・・・・・・駆動装置、２６・…・
・制御バルブ、２７・・・・・・回転部村、２９・・…
・内軸、３０・・・・・・外軸、３１・・・・・・操作
レバー、３２・・・・・・スブール操作アーム、３３・
・・・・・スプール操作フオーク、３４・・・・・・ス
プール、３８・・・・・・連結部材。 第１図 第２図 第４図 第５図 第３図The drawings show an embodiment of the wet working machine according to the present invention, and FIG. 1 is an overall side view of the riding-type rice transplanter, and FIG. 2 is a side view of the main parts.
3 is a schematic side view showing the control mechanism, FIG. 4 is a partially cutaway rear view of the main part, and FIG. 5 is a view taken along the line V--V in FIG. 4. 1... Vehicle body, 2... Shielding device, 11...
...Float, 21...Control mechanism, 24...
...Connection odor, 25... Drive device, 26...
・Control valve, 27...Rotating part village, 29...
・Inner shaft, 30... Outer shaft, 31... Operation lever, 32... Subur operation arm, 33.
... Spool operation fork, 34 ... Spool, 38 ... Connection member. Figure 1 Figure 2 Figure 4 Figure 5 Figure 3

Claims (1)

【特許請求の範囲】[Claims] １ 車体１に植込み装置２を駆動装置２５によりレベル
調整自在に装置すると共、植込み装置２の上下揺動可能
フロート１１と前記駆動装置２５の制御機構２１とを、
フロート１１の俯仰角を設定範囲内に自動的に維持すべ
く、解除自在に連係させた湿田作業機であつて、前記制
御機構２１の制御バルブ２６に、相対回転自在な内外二
重軸２９，３０を支承し、外軸３０には操作レバー３１
とスプール操作アーム３２を固着すると共に、内軸２９
には、回転部材２７とスプール操作フオーク３３を固着
し、前記スプール操作アーム３２は、スプール３４に上
昇操作方向時にのみ接当押圧可能に配置すると共に、ス
プール操作フオーク３３は前記スプール３４に正逆いず
れの操作方向にも係合できるように構成し、前記回転部
材２７には、一端が前記フロート１１に連結されていて
該フロート１１の上下動を伝達するための連繋具２４の
他端を係脱できるように構成した連結部材３８を装着す
ると共に、該連結部材３８を、連繋具２４と係合して前
記回転部材２７と一体作動可能となる作用姿勢と、連繋
具２４との係合を解除して操作レバー３１に係合し回転
部材２７とこの操作レバー３１とを一体作動可能とする
作用姿勢とに切換え自在に構成してある湿田作業機。1. The implantation device 2 is mounted on the vehicle body 1 so that its level can be freely adjusted by a drive device 25, and the vertically swingable float 11 of the implantation device 2 and the control mechanism 21 of the drive device 25 are connected to the vehicle body 1.
The wet field working machine is releasably linked to automatically maintain the elevation angle of the float 11 within a set range, and the control valve 26 of the control mechanism 21 is provided with a dual shaft 29, which is relatively rotatable. 30, and an operating lever 31 is mounted on the outer shaft 30.
and the spool operating arm 32, and the inner shaft 29
The rotating member 27 and the spool operating fork 33 are fixed to each other, and the spool operating arm 32 is arranged so as to be able to contact and press the spool 34 only in the upward operating direction, and the spool operating fork 33 is attached to the spool 34 in the forward and reverse directions. The rotating member 27 has one end connected to the float 11 and the other end of a linking member 24 for transmitting the vertical movement of the float 11. The connecting member 38 configured to be removable is attached, and the connecting member 38 is engaged with the connecting member 24 and placed in an operating position in which it can be operated integrally with the rotating member 27, and the connecting member 38 is engaged with the connecting member 24. This wet field working machine is configured to be able to be freely switched to an operating position in which the rotary member 27 and the operating lever 31 can be operated integrally by being released and engaged with the operating lever 31.