【０００１】
【発明の属する技術分野】
本発明は、回転刃の研磨装置に関する。
【０００２】
【従来の技術】
例えば草刈り機等に用いられる回転刃（チップソー）の各刃の研磨には、グラインダと呼ばれる研磨砥石を備えた電動研磨工具又は電動研磨装置を用いる。しかし、前記電動研磨工具を手に持って各刃を正しく研磨するのは難しく、従来より電動研磨工具に代わる、又は電動研磨工具を用いた研磨装置が種々提案されており、登録実用新案第３００１７８６号「チップソー等の研磨器」や特開２００１−３４７４４２「回転刈刃用研磨機」を例示できる。
【０００３】
登録実用新案第３００１７８６号は、小型の携帯用の電動研磨工具（グラインダ）を用い、台板の一側部側に、研磨盤を回転駆動自在に軸着した小型の携帯用の電動研磨工具を所定の角度に着脱可能に電動研磨工具取付材で装着し、前記台板の他側部側に超硬のチップソー等の被研磨材を水平旋回可能に搭載し、電動研磨工具の研磨盤に向かって弾性材に抗して摺動可能に摺動台を配設した研磨装置である。摺動台に搭載して摺動する超硬のチップソー等の被研磨材が前進するのを所定の位置で停止する前進限調節具を前進限位置調節可能に摺動台に設けてあり、素人でも簡単に確実に研磨できるようにしている。
【０００４】
特開２００１−３４７４４２は、回転刈刃（回転刃）の刃先における逃げ角の研磨とすくい角の研磨という２種の研磨に対応した電動研磨工具の取付位置の変更が簡単かつ確実にでき、電動研磨工具の装着安定性が極めて優れ、各刃先を均等に研磨できる研磨装置を提案している。具体的には、回転刈刃の刃先のすくい角の研磨と逃げ角の研磨に対応した基台上に各１個ずつテーパピンを立設させ、グラインダ（電動研磨工具）Ｍの側壁にこのテーパピンに支持される被支持部を設けて、２種の研磨に対応した箇所にグラインダ（電動研磨工具）Ｍを挿脱自在に装着できるように構成し、さらにグラインダ（電動研磨工具）Ｍをその先端の研磨面を上方に向けて基台上に載置して装着し、その上面に沿った箇所に刃物研ぎ台を位置させている。
【０００５】
【発明が解決しようとする課題】
回転刃の研磨は、特開２００１−３４７４４２が指摘しているように、各刃における（ａ）逃げ角の研磨＝天刃の研磨及び（ｂ）すくい角の研磨＝腹刃の研磨の２種類があり、各研磨を一つの研磨装置で実施できることが望ましい。特開２００１−３４７４４２は、上記２種類の研磨を、電動研磨工具の支持位置を切り替えることで実現している。電動研磨工具は、各テーパピンに従った角度で水平旋回させることができるが、各テーパピンに対する電動研磨工具の付け替え作業が必要で、回転刃の各刃すべての天刃の研磨を先に実施し、電動研磨工具の位置を替えて各刃すべての腹刃の研磨を実施する（特開２００１−３４７４４２公開公報［００１２］参照）。
【０００６】
回転刃の各刃毎に天刃及び腹刃の研磨ができることが好ましいが、各研磨に対して定めた電動研磨工具の水平角は固定であり、市販されている異なる種々の電動研磨工具毎に設定できる研磨砥石の水平角が異なる問題がある。また、同一の電動研磨工具を用いる場合でも、各刃毎に天刃及び腹刃を研磨するためには、特開２００１−３４７４４２の装置は煩雑に電動研磨工具を付け替えなければならい。そこで、市販されている電動研磨工具の違いに関係なく利用でき、しかも電動研磨工具の付け替え作業を要することなく、各刃毎に天刃及び腹刃の連続的な研磨作業を実現する研磨装置について検討した。
【０００７】
【課題を解決するための手段】
検討の結果開発したものが、ベース上に回転刃保持部及び研磨砥石操作部を設けた研磨装置において、回転刃保持部は研磨砥石操作部に対して回転刃を接近離反させる接近離反機構を、研磨砥石操作部は前記回転刃の接近離反方向に対して研磨砥石を水平旋回させる旋回機構をそれぞれ備え、研磨砥石操作部の旋回機構は研磨砥石を所定姿勢で保持する工具移動材と、この工具移動材をベースに係合する中心係合部及び旋回係合部とから構成してなり、この研磨砥石操作部は中心係合部により直線方向に移動自在な旋回中心と、旋回係合部により旋回半径を連続的に増減しながら旋回自在な楕円弧軌道とに従って水平旋回する回転刃の研磨装置である。
【０００８】
研磨砥石操作部は、旋回機構を備えた工具移動材に電動研磨工具を着脱自在及び姿勢自在（通常揺動姿勢自在）に取り付け、この電動研磨工具が有する研磨砥石を用いる構成を基本とするが、工具移動材に直接研磨砥石を設けた専用の装置構成でもよい。以下では、電動研磨工具を着脱自在及び姿勢自在に装置本体部に取り付けた構成とし、研磨砥石は工具移動材部に対して姿勢固定で取り付けた電動研磨工具の姿勢に従って研磨砥石の各刃に宛う場合を説明する。
【０００９】
天刃及び腹刃は、正確には直線状ではなく微妙に湾曲した円弧状で、それぞれの角度が異なるだけでなく前記円弧の曲率半径も異なるため、単に研磨砥石を水平旋回させても、天刃及び腹刃両方に適切な角度を実現しにくく、また天刃又は腹刃毎に微妙な円弧状を実現できない。そこで、本発明の研磨装置は、研磨砥石操作部の旋回機構により、研磨砥石が旋回中心を移動させながら旋回半径を連続的に増減（長く又は短く）する楕円弧軌道に従って水平旋回できるようにしている。これにより、各刃毎の天刃及び腹刃に合わせて、研磨砥石を宛う角度を連続的に調整しながら、また各天刃又は腹刃毎に研磨砥石を円弧状に微調整できる。
【００１０】
上記旋回機構を備えた研磨砥石操作部の実効性を確保するには、研磨砥石に対して直線的に一方向から回転刃が接近離反しながら、他方向へ動かないことが必要である。こうした回転刃保持部は、（１）研磨砥石の略中心高さに合わせた接面を有する載置台と、この接面に設けた回転刃の接近離反方向の案内部と、この案内部に沿って移動する突起軸とからなり、この回転刃保持部の接近離反機構は案内部に沿って移動する突起軸により構成し、回転刃は突起軸に嵌合して接面に摺接しながら研磨砥石操作部に対して接近離反する構成とする。
【００１１】
回転刃は、突起軸によって研磨砥石に対する接近離反方向のみ運動し、前記方向以外の水平面内はもちろん、高さ方向にも接面により規制され、不要な動きをしない。特に、本発明のように回転刃に宛う研磨砥石の角度を微調整できるようにした場合、不要な回転刃の動きを極力規制する必要があるが、回転刃は接面に摺接して動くため、運動方向が規制されるだけでなく、唯一許された接近離反方向へも姿勢を崩すことなく安定して回転刃を運動させることができる。こうした回転刃の運動を実現するには、突起軸の運動を規定する案内部として、回転刃の接近離反方向で接面内に延在する長孔が好ましい。しかし、突起軸の移動方向を一方向及び直線的に規制できれば、凸条又は凹溝でもよい。
【００１２】
ここで、回転刃保持部は、研磨砥石操作部に対する回転刃の接近方向で載置台に係止する基準設定ボルトを突起軸の位置設定部に螺合し、基準設定ボルトは研磨砥石操作部に対する回転刃の離反方向で反発する圧縮バネを装着し、研磨砥石操作部に対する回転刃の接近方向へ突起軸を付勢する構成にすると、装置利用者は回転刃を後退させて回転刃を各刃毎に送る（回転刃の円周方向に各刃を送る）だけで、後は自動的に回転刃が前進し、適度な押圧力（＝付勢力）をもって研磨砥石に宛うことができる。
【００１３】
別例の回転刃保持部は、（２）研磨砥石の略中心高さに合わせた接面を有し、下方に向けて摺動脚を設けた載置台と、この接面に突設する突起軸とからなり、回転刃保持部の接近離反機構はベースに設けた回転刃の接近離反方向の案内部に摺動脚を差し込んで移動する該載置台により構成し、回転刃は突起軸に嵌合して接面に摺接しながら研磨砥石操作部に対して接近離反する構成がある。ここで、研磨砥石操作部に対する回転刃の接近離反方向に移動自在な基準設定材をベースに設け、前記基準設定材に当接又は係止する前進位置決め部を回転刃保持部の載置台に設けると、研磨砥石に対して回転刃を接近させ過ぎることがなくなり、安全性が高まる。
【００１４】
更に別例の回転刃保持部は、（３）研磨砥石の略中心高さに合わせた摺接面を有し、この摺接面に案内部を設けた載置台と、この案内部に沿って移動する接面部と、この接面部に突設する突起軸とからなり、該回転刃保持部の接近離反機構は載置台の摺接面に設けた案内部に沿って移動する接面部により構成し、回転刃は突起軸に嵌合して接面部と一体に移動しながら研磨砥石操作部に対して接近離反する構成を例示できる。
【００１５】
上記構成において、（ａ）研磨砥石操作部に対する回転刃の接近離反方向に移動自在な基準設定材をベースに設け、前記基準設定材に当接又は係止する前進位置決め部を回転刃保持部の接面部に設けるか、（ｂ）研磨砥石操作部に対する回転刃の接近離反方向に移動自在な基準設定ボルトを接面部の位置設定部に螺合し、この基準設定ボルトに当接又は係止する前進位置決め部を載置台に設けると、研磨砥石に対する回転刃の過剰接近を防止できる。
【００１６】
また、上記回転刃保持部は、研磨砥石操作部に対する回転刃の接近方向で載置台に係止する基準設定ボルトを接面部の位置設定部に螺合し、この基準設定ボルトは研磨砥石操作部に対する回転刃の離反方向で反発する圧縮バネを装着し、研磨砥石操作部に対する回転刃の接近方向へ接面部を付勢すると、装置利用者は回転刃を後退させて回転刃を各刃毎に送る（回転刃の円周方向に各刃を送る）だけで、後は自動的に回転刃が前進し、適度な押圧力（＝付勢力）をもって研磨砥石に宛うことができる。
【００１７】
【発明の実施の形態】
以下、本発明の実施形態について図を参照しながら説明する。図１は回転刃１の接近離反方向に移動する突起軸２を載置台３に係合した回転刃保持部４を設けた研磨装置を表す斜視図、図２は載置台３の断面図、図３は研磨砥石操作部５を表す平面図、図４は研磨砥石操作部５を回転刃１の直交方向に向けて水平旋回させた状態を表す平面図、図５は研磨砥石操作部５を回転刃１の接線方向に向けて水平旋回させた状態を表す平面図、図６は研磨砥石操作部５に対する回転刃１の接近方向で載置台３に係止する基準設定ボルト６を設けた研磨装置を表す斜視図で、図７は基準設定ボルト６の働きを表す部分側面図である。
【００１８】
まず、各例に共通な全体構成及び研磨砥石操作部５を説明する。本発明の研磨装置は、図１に見られるように、四隅に台足ゴム７を取り付けた金属製平板からなるベース８上に、回転刃保持部４及び研磨砥石操作部５を設けている。研磨砥石操作部５は、金属製板材を断面Ｌ字形に折り曲げて水平板９及び垂直板１０からなる工具移動材１１を形成し、前記垂直板１０に対して同じく金属製板材からなる工具取付材１２を揺動自在に螺着し、電動研磨工具（グラインダ）１３は前記工具取付材１２の装着ベルト１４により装着する。工具取付材１２は、垂直板１０に対する螺着要素であるネジ１５を揺動中心として揺動自在になっており、工具取付材１２に設けた円周方向の揺動長孔１６から締結ボルト１７を垂直板１０に締め付けて、工具移動材１１の垂直板１０に対して所定の揺動角を保って固定する。これにより、電動研磨工具１３が備える研磨砥石１８は、所定の揺動姿勢を実現、保持する。電動研磨工具１３の揺動角は、工具移動材１１の垂直板１０に刻設した角度目盛り１９を指示する工具取付材１２の指示突部２０によって目視しながら決定する。この揺動姿勢の調整は、市販されている電動研磨工具毎に異なる研磨砥石の揺動角の違いを吸収し、使用にあたって同じ揺動角を実現する効果をもたらす。
【００１９】
工具移動材１１の水平板９は、ベース８に対して摺接しながら中心係合部２１により定まる旋回中心を軸に水平面内で水平旋回し、電動研磨工具１３の水平角、すなわち研磨砥石１８の旋回姿勢を決定する。本発明は、前記旋回姿勢は一定の旋回半径に基づく水平旋回ではなく、工具移動材１１の水平板９と、この水平板９に設けた中心係合部２１及び旋回係合部２２とにより旋回機構を構成し、前記中心係合部２１及び旋回係合部２２がそれぞれ移動して、回転刃保持部４に対する水平角が異なる旋回姿勢毎に、旋回半径を連続的に増減する楕円弧軌道に従って研磨砥石１８が水平旋回できるようにしている。
【００２０】
本例の工具移動材１１は、回転刃１（図３〜図５参照）の接近離反方向に延在する移動材長孔２３を水平板９に設け、この移動材長孔２３に対して中心係合部２１を係合し、工具移動材１１を移動自在にしている。すなわち、本例では中心係合部２１を位置固定し、この中心係合部２１と係合する移動材長孔２３を有する工具移動材１１が相対的に移動する構成である。本例とは逆に、ベースに長孔を設け、工具移動材に固着した中心係合部を移動自在に前記長孔に係合してもよい。本例の中心係合部２１はフランジ付ボルトにナットを螺合して構成しており、工具移動材１１側からフランジ付ボルトを移動材長孔２３、ベース８に挿通し、ベース８裏面でナットを螺着することで、移動材長孔２３との係合を実現している。
【００２１】
旋回係合部２２は、旋回半径を連続的に増減しながら旋回方向に延在してベース８に設けた旋回長孔２４へ、工具移動材１１が旋回自在となるように係合している。本例の旋回係合部２２はフランジ付ボルトにナットを螺合して構成し、工具移動材１１側からフランジ付ボルトをベース８の旋回長孔２４に挿通し、ベース８裏面でナットを螺着することで、旋回長孔２４との係合を実現している。工具移動材１１は、旋回長孔２４に従って旋回係合部２２が移動する際、同時に中心係合部２１の移動材長孔２３に対する係合位置が移動することで、図３〜図５に見られるように、前記中心係合部２１の係合位置〜旋回係合部２２の距離＝旋回半径を増減しながら水平旋回する。これにより、回転刃１の各刃（図示略）毎における天刃及び腹刃に適切な角度及び微調整を工具移動材１１の水平旋回により実現でき、従来同種の研磨装置に比べ、より細かで丁寧な回転刃１の研磨が可能となる。
【００２２】
本例の回転刃保持部４は、図１に見られるように、研磨砥石操作部５に対して回転刃１を接近離反させる接近離反機構を、研磨砥石１８の略中心高さに合わせた接面２５を有する載置台３と、この接面２５に設けた回転刃１の接近離反方向に延在する案内部である接面長孔２６と、この接面長孔２６に沿って移動する突起軸２とから構成している。突起軸２は、図１及び図２に見られるように、接面長孔２６から差し込んだ係合ボルト２７に螺合した係止用リング２８を接面２５裏から係合し、突起軸２が接面長孔２６から離脱しないようにしている。また、載置台３は、接面２５から研磨砥石操作部５に向けて連続する突出部２９を突出し、研磨中に負荷がかかる回転刃１を安定して支持できるようにしている。回転刃１は、中心に設けてある取付孔を突起軸２に嵌合し、接面２５に摺接しながら研磨砥石操作部５に対して接近離反する。本例では、利用者が手で回転刃を持って接近離反させるが、突起軸を動力によって接近離反を実現してもよい。
【００２３】
上記回転刃保持部４は、研磨砥石操作部５に対する回転刃１の接近離反方向に突起軸２の規制を施していないが、例えば図６及び図７に見られるように、研磨砥石操作部５に対する回転刃１の接近方向で載置台３に係止する基準設定ボルト６を、突起軸２に取り付けた位置設定部である位置設定板３０に螺合し、研磨砥石操作部５に対する回転刃１の離反方向で反発する圧縮バネ３１を基準設定ボルト６に装着して、研磨砥石操作部５に対する回転刃１の接近方向へ突起軸２を付勢してもよい。これにより、突起軸２は圧縮バネ３１の反発により常に前進しようとするので回転刃１の後退を制限できると共に、圧縮バネ３１の伸長限度により突起軸２の前進量を制限、すなわち研磨砥石１８に対する回転刃１の異常接近をも防止できるようになる。
【００２４】
図８は接面２５に突起軸２を設けた載置台３の摺動脚３２，３２をベース８の案内部に差し込んで移動する回転刃保持部４を設けた研磨装置を表す斜視図であり、図９は載置台３の案内部に沿って移動する接面部３３からなる回転刃保持部４を設けた研磨装置の斜視図である。図８及び図９に示す各例は、上記例示（図１参照）と異なる回転刃保持部４を構成し、かつ基準設定材３４を設けて研磨砥石操作部５に対する回転刃１の接近を制限した研磨装置についての例である。
【００２５】
図８に見られる回転刃保持部４は、研磨砥石１８の略中心高さに合わせた接面２５を有し、下方に向けて摺動脚３２，３２を設けた載置台３と、この接面２５に突設する突起軸２とからなる。この回転刃保持部４の接近離反機構は、ベース８に設けた回転刃１の接近離反方向に延在する案内部である前後一対の案内溝３５，３５にそれぞれ摺動脚３２，３２を差し込んで移動する載置台３により構成している。接面２５には、連続して突出部２９を突出しており、回転刃１は突起軸２に嵌合して載置台３と一体となって研磨砥石操作部５に対して接近離反する。
【００２６】
本例では、更に研磨砥石操作部５に対する回転刃１の接近離反方向に移動自在な基準設定材３４をベース８に設け、前記基準設定材３４に係止する前進位置決め部として制限板３６を載置台３に設けている。基準設定材３４は、金属製の板材を折り曲げて係止面３７、ベース摺接面３８及び操作面３９を形成し、前記ベース摺接面３８に調整長孔４０を設けた部材で、前記調整長孔４０に挿通した設定材締結ボルト４１によりベース８に固定する。回転刃１は、載置台３の制限板３６を基準設定材３４の係止面３７に係止することで、前進が制限されるようになる。
【００２７】
図９に見られる回転刃保持部４は、研磨砥石１８の略中心高さに合わせた摺接面４２を有し、この摺接面４２の側縁を案内部とする載置台３と、前記摺接面４２の側縁それぞれに両側のガイド４３，４３を添わせて移動する接面部３３と、この接面部３３に突設する突起軸２とから構成している。接近離反機構は、載置台３の摺接面４２の側縁にガイド４３，４３を添わせて移動する接面部３３により構成する。接面部３３は、連続して突出部２９を突出している。回転刃１は、突起軸２に嵌合して接面部３３と一体に移動しながら研磨砥石操作部５に対して接近離反する。本例では、上記例示（図８参照）と同様、基準設定材３４をベース８に固定し、接面部３３に設けた制限板３６を前記基準設定材３４の係止面３７に係止することで、回転刃１の前進を制限する。
【００２８】
基準設定材３４は、研磨砥石操作部５に対する回転刃１の過剰な接近を抑制又は防止できればよい。そこで、上記図９に示した構成に代えて、図１０（載置台３の案内部に沿って移動する接面部３３からなる回転刃保持部４を設けた別例の研磨装置の斜視図）及び図１１（基準設定ボルト６の働きを表す部分側面図）に見られるように、研磨砥石操作部５に対する回転刃１の接近離反方向に移動自在な基準設定材として基準設定ボルト６を接面部３３から垂下した位置設定部である位置設定板３０に螺合し、この基準設定ボルト６の先端が当接する前進位置決め部として載置台３の前面４４を利用する構成を例示できる。接面部３３は、前記前面４４に先端を当接するまで前進する基準設定ボルト６により、研磨砥石操作部５に対する回転刃１の過剰な接近を抑制できる。
【００２９】
図１２は載置台３の案内部に沿って移動する接面部３３からなる回転刃保持部４を設けた更に別例の研磨装置の斜視図であり、図１３は接面部３３に設けた位置設定部である位置設定板３０に螺合する基準設定ボルト６の働きを表す部分側面図である。本例は、研磨砥石操作部５に対する回転刃１の接近方向で載置台３に係止する基準設定ボルト６を、接面部３３に取り付けた位置設定部である位置設定板３０に螺合し、研磨砥石操作部５に対する回転刃１の離反方向で反発する圧縮バネ３１を基準設定ボルト６に装着することで、研磨砥石操作部５に対する回転刃１の接近方向へ突起軸２を付勢した構成である。これにより、圧縮バネ３１の反発により突起軸２は常に前進しようとして回転刃１の後退を制限すると共に、圧縮バネ３１の伸長限度により突起軸２の前進量を制限、すなわち研磨砥石１８に対する回転刃１の異常接近をも防止できるようになる。
【００３０】
【発明の効果】
本発明は、まず研磨砥石操作部により、回転刃の各刃における（ａ）天刃の研磨及び（ｂ）腹刃の研磨を、研磨砥石の付け替え（電動研磨工具＝グラインダの付け替え）を要することなく、容易かつ細やかに調整しながら実現できるようにする。これは、構造の異なる種々の電動研磨工具に基づく研磨砥石の姿勢（特に研磨砥石の水平角）の違いを吸収して、いずれの電動研磨工具でも同様に利用しうる効果をもたらす。そして、こうした研磨砥石操作部に対して回転刃が接近離反する方向にだけ動く回転刃保持部を設けることで、正確な（ａ）天刃の研磨及び（ｂ）腹刃の研磨をも可能にする。更に、回転刃操作部に設ける基準設定材や、研磨砥石に対する接近方向への回転刃の付勢により、装置利用者は特に注意を払うことなく、回転刃を研磨砥石に宛うために押す、又は刃送りのために回転刃を引く、といった簡単な作業だけを意識すればよいので、労力が軽減される。本発明は、このように簡易な作業で従来以上に容易かつ細やかな回転刃の研磨を実現する効果を有する。
【図面の簡単な説明】
【図１】回転刃の接近離反方向に移動する突起軸を載置台に係合した回転刃保持部を設けた研磨装置を表す斜視図である。
【図２】載置台の断面図である。
【図３】研磨砥石操作部を表す平面図である。
【図４】研磨砥石操作部を回転刃の直交方向に向けて水平旋回させた状態を表す平面図である。
【図５】研磨砥石操作部を回転刃の接線方向に向けて水平旋回させた状態を表す平面図である。
【図６】研磨砥石操作部に対する回転刃の接近方向で載置台に係止する基準設定ボルトを設けた研磨装置を表す斜視図である。
【図７】基準設定ボルトの働きを表す部分側面図である。
【図８】接面に突起軸を設けた載置台の摺動脚をベースの案内部に差し込んで移動する回転刃保持部を設けた研磨装置を表す斜視図である。
【図９】載置台の案内部に沿って移動する接面部からなる回転刃保持部を設けた研磨装置の斜視図である。
【図１０】載置台の案内部に沿って移動する接面部からなる回転刃保持部を設けた別例の研磨装置の斜視図である。
【図１１】基準設定ボルトの働きを表す部分側面図である。
【図１２】載置台の案内部に沿って移動する接面部からなる回転刃保持部を設けた更に別例の研磨装置の斜視図である。
【図１３】接面部に設けた位置設定部である位置設定板に螺合する基準設定ボルトの働きを表す部分側面図である。
【符号の説明】
１ 回転刃
２ 突起軸
３ 載置台
４ 回転刃保持部
５ 研磨砥石操作部
６ 基準設定ボルト
８ ベース
１１ 工具移動材
１２ 工具取付材
１３ 電動研磨工具（グラインダ）
１８ 研磨砥石
２１ 中心係合部
２２ 旋回係合部
２３ 移動材長孔
２４ 旋回長孔
２５ 接面
２６ 接面長孔[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary blade polishing apparatus.
[0002]
[Prior art]
For example, for polishing each blade of a rotary blade (tip saw) used in a mower or the like, an electric polishing tool or an electric polishing device provided with a polishing grindstone called a grinder is used. However, it is difficult to correctly grind each blade by holding the electric polishing tool in a hand, and various polishing apparatuses have been proposed in the place of the electric polishing tool or using the electric polishing tool. No. "A grinder such as a chip saw" and JP-A-2001-347442 "A grinder for a rotary cutting blade" can be exemplified.
[0003]
Japanese Utility Model Registration No. 30017886 discloses a small portable electric polishing tool which uses a small portable electric polishing tool (grinder) and has a polishing plate rotatably mounted on one side of a base plate. Attached with an electric polishing tool attachment material detachably at a predetermined angle, a material to be polished such as a carbide tip saw is mounted on the other side of the base plate so as to be able to turn horizontally, and is directed toward the polishing machine of the electric polishing tool. This is a polishing apparatus in which a slide table is provided so as to be slidable against an elastic material. An advance limit adjuster that stops a workpiece to be polished such as a carbide tip saw that slides on a slide table at a predetermined position is provided on the slide table so that the advance limit position can be adjusted. But it is designed to be easy and reliable.
[0004]
Japanese Patent Application Laid-Open No. 2001-347442 can easily and reliably change the mounting position of an electric polishing tool corresponding to two types of polishing, namely, polishing of a clearance angle and polishing of a rake angle at the cutting edge of a rotary cutting blade (rotary blade). There has been proposed a polishing apparatus having extremely excellent mounting stability of a polishing tool and capable of uniformly polishing each cutting edge. More specifically, one taper pin is erected on a base corresponding to the rake angle and the clearance angle of the cutting edge of the rotary cutting blade, and the taper pin is provided on the side wall of a grinder (electric polishing tool) M. A supported portion to be supported is provided so that a grinder (electric polishing tool) M can be removably mounted at a position corresponding to two types of polishing. The polished surface is mounted on the base with the polished surface facing upward, and the blade sharpening table is located at a position along the upper surface.
[0005]
[Problems to be solved by the invention]
As pointed out in Japanese Patent Application Laid-Open No. 2001-347442, there are two types of polishing of the rotary blade: (a) polishing of the clearance angle = polishing of the top blade and (b) polishing of the rake angle = polishing of the belly blade for each blade. Therefore, it is desirable that each polishing can be performed by one polishing apparatus. Japanese Patent Application Laid-Open No. 2001-347442 realizes the above two types of polishing by switching the support position of the electric polishing tool. The electric polishing tool can be turned horizontally at an angle according to each taper pin, but it is necessary to replace the electric polishing tool for each taper pin, and first perform polishing of all the top blades of each rotary blade, The position of the electric polishing tool is changed to polish the belly blades of all the blades (see Japanese Patent Application Laid-Open No. 2001-347442 [0012]).
[0006]
It is preferable that the top blade and the belly blade can be polished for each blade of the rotary blade.However, the horizontal angle of the electric polishing tool defined for each polishing is fixed, and for each of various commercially available different electric polishing tools, There is a problem that the horizontal angle of the polishing wheel that can be set is different. Further, even when the same electric polishing tool is used, in order to polish the top blade and the abdominal blade for each blade, the apparatus disclosed in JP-A-2001-347442 must change the electric polishing tool in a complicated manner. Therefore, a polishing apparatus that can be used regardless of the difference between commercially available electric polishing tools, and that realizes continuous polishing of a top blade and a belly blade for each blade without requiring replacement work of the electric polishing tool. investigated.
[0007]
[Means for Solving the Problems]
What was developed as a result of the examination, in a polishing apparatus provided with a rotary blade holding unit and a polishing wheel operating unit on the base, the rotating blade holding unit has an approach / separation mechanism that moves the rotating blade toward and away from the polishing wheel operating unit, The grinding wheel operating unit includes a turning mechanism that horizontally turns the grinding wheel in the approaching and separating directions of the rotary blade. The turning mechanism of the grinding wheel operating unit includes a tool moving member that holds the grinding wheel in a predetermined posture, The grinding wheel operating part comprises a center engaging part and a turning engaging part for engaging the moving material with the base. This is a rotary blade polishing apparatus that horizontally turns according to a swivelable elliptical arc trajectory while continuously increasing and decreasing the turning radius.
[0008]
The grinding wheel operating unit is basically configured such that an electric polishing tool is detachably and freely mounted on a tool moving member having a turning mechanism (usually free to swing), and a polishing wheel provided in the electric grinding tool is used. Alternatively, a dedicated device configuration in which a polishing wheel is directly provided on the tool moving member may be used. In the following, the configuration is such that the electric polishing tool is detachably and freely mounted on the apparatus main body, and the polishing grindstone is addressed to each blade of the polishing grindstone according to the posture of the electric polishing tool fixedly mounted on the tool moving member. Will be described.
[0009]
The top blade and the belly blade are not exactly linear but slightly curved arcs, and not only have different angles but also different radii of curvature of the arcs. It is difficult to achieve an appropriate angle for both the blade and the belly blade, and it is not possible to realize a subtle arc shape for each top blade or belly blade. Therefore, the polishing apparatus of the present invention enables the polishing wheel to horizontally rotate according to an elliptical arc trajectory in which the turning radius is continuously increased or decreased (long or short) while moving the turning center by the turning mechanism of the polishing wheel operating unit. . Thus, the grinding wheel can be finely adjusted in an arc shape for each top blade or belly blade while continuously adjusting the angle to which the grinding wheel is applied in accordance with the top blade and belly blade of each blade.
[0010]
In order to ensure the effectiveness of the grinding wheel operating unit provided with the turning mechanism, it is necessary that the rotary blade approaches and separates from the grinding wheel in one direction linearly and does not move in the other direction. Such a rotary blade holding portion includes: (1) a mounting table having a contact surface adjusted to substantially the center height of a polishing grindstone, a guide portion provided on the contact surface in a direction in which the rotary blade approaches and separates, and The rotating blade holder is configured to have a protruding shaft that moves along the guide portion. It is configured to approach and move away from the operation unit.
[0011]
The rotating blade moves only in the direction of approaching and moving away from the grinding wheel by the projection axis, and is restricted by the contact surface not only in the horizontal plane but also in the height direction other than the above direction, and does not move unnecessarily. In particular, when the angle of the grinding wheel directed to the rotary blade can be finely adjusted as in the present invention, it is necessary to restrict unnecessary movement of the rotary blade as much as possible, but the rotary blade slides on the contact surface and moves. Therefore, not only the movement direction is restricted, but also the rotating blade can be stably moved in the only allowed approaching / separating direction without losing the posture. In order to realize such a movement of the rotary blade, a long hole extending in the contact surface in the approaching / separating direction of the rotary blade is preferably used as a guide for regulating the movement of the projection shaft. However, a ridge or a groove may be used as long as the movement direction of the projection shaft can be regulated in one direction and linearly.
[0012]
Here, the rotary blade holding unit is screwed with a reference setting bolt that locks to the mounting table in a direction in which the rotary blade approaches the polishing wheel operating unit to the position setting unit of the projection shaft, and the reference setting bolt is By installing a compression spring that repels in the direction in which the rotary blade separates, and urges the protruding shaft in the direction in which the rotary blade approaches the grinding wheel operating unit, the user of the apparatus retracts the rotary blade and moves the rotary blade to each blade. By simply feeding each time (feeding each blade in the circumferential direction of the rotary blade), the rotary blade automatically advances thereafter, and can reach the grinding wheel with an appropriate pressing force (= biasing force).
[0013]
Another example of the rotary blade holder is (2) a mounting table having a contact surface corresponding to the approximate center height of the grinding wheel, a mounting table provided with sliding legs facing downward, and a projection protruding from the contact surface. The rotating blade holder has an approaching / separating mechanism of the rotating blade holder, and the mounting table is configured to move by inserting a sliding leg into the guide portion of the rotating blade approaching / separating direction, and the rotating blade is fitted on the projection shaft. There is a configuration in which the polishing wheel approaches and separates from the operation unit while sliding on the contact surface. Here, a reference setting material that is movable in the direction in which the rotary blade approaches and separates from the polishing wheel operating unit is provided on the base, and a forward positioning unit that abuts or locks on the reference setting material is provided on the mounting table of the rotary blade holding unit. This prevents the rotating blade from being too close to the polishing grindstone, thereby increasing safety.
[0014]
Still another example of the rotary blade holding portion has (3) a sliding surface which is adjusted to substantially the height of the center of the grinding wheel, and a mounting table provided with a guide portion on the sliding surface, and along the guide portion. It comprises a moving contact surface portion and a projecting shaft projecting from the contact surface portion, and the approach / separation mechanism of the rotary blade holding portion is constituted by a contact surface portion moving along a guide portion provided on a sliding contact surface of the mounting table. In addition, a configuration in which the rotating blade approaches and separates from the polishing grindstone operation unit while being fitted to the projection shaft and moving integrally with the contact surface portion can be exemplified.
[0015]
In the above configuration, (a) a reference setting material that is movable in a direction in which the rotary blade approaches and separates from the grinding wheel operating unit is provided on the base, and a forward positioning unit that abuts or locks on the reference setting material is provided on the rotary blade holding unit. Either provided on the contact surface, or (b) a reference setting bolt that is movable in the direction in which the rotary blade approaches or separates from the grinding wheel operating portion is screwed into the position setting portion of the contact surface to abut or lock the reference setting bolt. When the forward positioning unit is provided on the mounting table, it is possible to prevent the rotating blade from excessively approaching the polishing grindstone.
[0016]
Further, the rotary blade holding unit is configured to screw a reference setting bolt, which locks to the mounting table in a direction in which the rotary blade approaches the polishing wheel operating unit, to a position setting unit of the contact surface portion, and the reference setting bolt is a polishing wheel operating unit. When a compression spring that rebounds in the direction in which the rotary blade separates from the rotating blade is attached, and the contact surface is urged in the direction in which the rotary blade approaches the grinding wheel operating unit, the user of the device retracts the rotary blade and sets the rotary blade for each blade. Only by feeding (feeding each blade in the circumferential direction of the rotary blade), the rotary blade automatically advances thereafter, and can reach the grinding wheel with an appropriate pressing force (= biasing force).
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a polishing apparatus provided with a rotary blade holder 4 in which a projection shaft 2 that moves in a direction in which the rotary blade 1 approaches and separates from a mounting table 3. FIG. 2 is a cross-sectional view of the mounting table 3. 3 is a plan view showing the grinding wheel operating unit 5, FIG. 4 is a plan view showing a state in which the grinding wheel operating unit 5 is horizontally turned in the direction perpendicular to the rotary blade 1, and FIG. FIG. 6 is a plan view showing a state in which the blade 1 is horizontally turned in a tangential direction. FIG. 6 is a polishing apparatus provided with a reference setting bolt 6 which is engaged with the mounting table 3 in a direction in which the rotary blade 1 approaches the polishing wheel operating unit 5. FIG. 7 is a partial side view showing the function of the reference setting bolt 6.
[0018]
First, the overall configuration common to each example and the grinding wheel operating unit 5 will be described. As shown in FIG. 1, the polishing apparatus of the present invention has a rotary blade holder 4 and a polishing wheel operating unit 5 on a base 8 made of a flat metal plate with rubber feet 7 attached to four corners. The grinding wheel operating unit 5 forms a tool moving member 11 composed of a horizontal plate 9 and a vertical plate 10 by bending a metal plate material into an L-shaped cross section, and a tool mounting member also composed of a metal plate material with respect to the vertical plate 10 An electric polishing tool (grinder) 13 is mounted on a mounting belt 14 of the tool mounting member 12. The tool mounting member 12 is swingable around a screw 15 which is a screwing element to the vertical plate 10 as a swing center, and is provided with a fastening bolt 17 through a circumferential swinging long hole 16 provided in the tool mounting member 12. Is fixed to the vertical plate 10 while maintaining a predetermined swing angle with respect to the vertical plate 10 of the tool moving member 11. Thereby, the polishing grindstone 18 provided in the electric polishing tool 13 achieves and holds a predetermined swinging posture. The swing angle of the electric polishing tool 13 is determined while visually observing the pointing projection 20 of the tool mounting member 12 for indicating the angle scale 19 engraved on the vertical plate 10 of the tool moving member 11. The adjustment of the swinging posture has an effect of absorbing the difference in the swinging angle of the polishing grindstone which is different for each commercially available electric polishing tool and realizing the same swinging angle in use.
[0019]
The horizontal plate 9 of the tool moving member 11 rotates horizontally in a horizontal plane around the rotation center determined by the center engaging portion 21 while slidingly contacting the base 8, and the horizontal angle of the electric polishing tool 13, that is, the horizontal angle of the polishing grindstone 18. Determine the turning posture. According to the present invention, the turning posture is not horizontal turning based on a constant turning radius, but is turned by the horizontal plate 9 of the tool moving member 11 and the center engaging portion 21 and the turning engaging portion 22 provided on the horizontal plate 9. The center engaging portion 21 and the turning engaging portion 22 are respectively moved to polish according to an elliptical arc trajectory that continuously increases and decreases the turning radius for each turning posture having a different horizontal angle with respect to the rotary blade holding portion 4. The grindstone 18 can be turned horizontally.
[0020]
In the tool moving member 11 of the present embodiment, a moving member long hole 23 extending in the approaching / separating direction of the rotary blade 1 (see FIGS. 3 to 5) is provided in the horizontal plate 9, and the center of the moving member long hole 23 is provided. The engaging portion 21 is engaged to make the tool moving member 11 movable. That is, in this example, the position of the center engaging portion 21 is fixed, and the tool moving member 11 having the moving member long hole 23 engaged with the center engaging portion 21 relatively moves. Contrary to this example, a long hole may be provided in the base, and the center engaging portion fixed to the tool moving member may be movably engaged with the long hole. The center engaging portion 21 of this example is formed by screwing a nut to a flanged bolt, and the flanged bolt is inserted into the moving material slot 23 and the base 8 from the tool moving material 11 side. The engagement with the moving material long hole 23 is realized by screwing the nut.
[0021]
The turning engagement portion 22 extends in the turning direction while continuously increasing and decreasing the turning radius, and engages with the turning long hole 24 provided in the base 8 so that the tool moving member 11 can turn freely. . The turning engagement portion 22 of this example is configured by screwing a nut to a bolt with a flange, inserting the bolt with the flange into the turning slot 24 of the base 8 from the tool moving member 11 side, and screwing the nut on the back surface of the base 8. The engagement with the turning long hole 24 is realized by attaching. When the turning engagement portion 22 moves according to the turning slot 24, the tool moving member 11 simultaneously moves the engagement position of the center engaging portion 21 with the moving member slot 23, as shown in FIGS. As shown in the figure, horizontal turning is performed while increasing / decreasing the turning radius = the distance from the engaging position of the center engaging portion 21 to the turning engaging portion 22. Thereby, an appropriate angle and fine adjustment of the top blade and the belly blade for each blade (not shown) of the rotary blade 1 can be realized by the horizontal rotation of the tool moving member 11, and it is finer and finer than the conventional polishing apparatus of the same type. Careful polishing of the rotary blade 1 is possible.
[0022]
As shown in FIG. 1, the rotary blade holding unit 4 of the present embodiment has a contact / separation mechanism that moves the rotary blade 1 toward and away from the polishing grindstone operation unit 5 so as to match the approximate center height of the polishing grindstone 18. A mounting table 3 having a surface 25, a contact surface long hole 26 provided on the contact surface 25 and extending in a direction in which the rotary blade 1 approaches and separates, and a projection moving along the contact surface long hole 26 And the shaft 2. As shown in FIGS. 1 and 2, the projecting shaft 2 engages a locking ring 28 screwed into an engaging bolt 27 inserted from a long surface 26 of the contact surface from the back of the contact surface 25. Are not separated from the contact surface long hole 26. Further, the mounting table 3 protrudes a continuous protruding portion 29 from the contact surface 25 toward the grinding wheel operating portion 5 so that the rotary blade 1 that is loaded during polishing can be stably supported. The rotary blade 1 fits a mounting hole provided at the center with the projection shaft 2, and moves toward and away from the grinding wheel operating unit 5 while slidingly contacting the contact surface 25. In the present example, the user approaches and separates by holding the rotary blade by hand, but the protrusion shaft may be approached and separated by power.
[0023]
Although the rotary blade holder 4 does not restrict the projection shaft 2 in the direction in which the rotary blade 1 approaches and separates from the grinding wheel operating unit 5, as shown in FIGS. 6 and 7, for example, as shown in FIGS. The reference setting bolt 6 which is locked to the mounting table 3 in the approach direction of the rotary blade 1 to the position setting plate 30 which is a position setting portion attached to the projection shaft 2 is screwed into the rotary blade 1 with respect to the grinding wheel operating unit 5. May be mounted on the reference setting bolt 6 to bias the projection shaft 2 in the direction in which the rotary blade 1 approaches the polishing grindstone operation unit 5. Thus, the projection shaft 2 always tries to move forward due to the repulsion of the compression spring 31, so that the retreat of the rotary blade 1 can be limited, and the extension amount of the projection shaft 2 is limited by the extension limit of the compression spring 31, that is, with respect to the polishing grindstone 18. Abnormal approach of the rotary blade 1 can also be prevented.
[0024]
FIG. 8 is a perspective view showing a polishing apparatus provided with a rotary blade holder 4 which moves by inserting the sliding legs 32 of the mounting table 3 having the protruding shaft 2 on the contact surface 25 into the guide portion of the base 8. FIG. 9 is a perspective view of a polishing apparatus provided with a rotary blade holding portion 4 including a contact surface portion 33 that moves along a guide portion of the mounting table 3. Each of the examples shown in FIGS. 8 and 9 constitutes a rotary blade holder 4 different from the above example (see FIG. 1), and provides a reference setting material 34 to restrict the approach of the rotary blade 1 to the polishing wheel operating unit 5. This is an example of a polishing apparatus that is used.
[0025]
The rotary blade holder 4 shown in FIG. 8 has a contact surface 25 corresponding to the approximate center height of the polishing grindstone 18, and the mounting table 3 provided with sliding legs 32, 32 facing downward, and the contact surface 25. And a projection shaft 2 projecting from the surface 25. The approaching / separating mechanism of the rotary blade holder 4 inserts the sliding legs 32, 32 into a pair of front and rear guide grooves 35, 35 which are guide portions provided on the base 8 and extending in the approaching / separating direction of the rotary blade 1. And the mounting table 3 that moves. The protruding portion 29 is continuously protruding from the contact surface 25, and the rotary blade 1 is fitted to the protruding shaft 2, and approaches and separates from the polishing grindstone operation unit 5 integrally with the mounting table 3.
[0026]
In the present example, a reference setting member 34 that is movable in the direction in which the rotary blade 1 approaches and separates from the polishing grindstone operation unit 5 is further provided on the base 8, and a limiting plate 36 is mounted as a forward positioning portion that is locked to the reference setting member 34. It is provided on the table 3. The reference setting member 34 is a member having a locking surface 37, a base sliding contact surface 38, and an operation surface 39 formed by bending a metal plate material, and an adjustment slot 40 provided in the base sliding contact surface 38. It is fixed to the base 8 by the setting material fastening bolt 41 inserted through the long hole 40. The advancement of the rotary blade 1 is restricted by locking the limiting plate 36 of the mounting table 3 to the locking surface 37 of the reference setting member 34.
[0027]
The rotary blade holder 4 shown in FIG. 9 has a sliding surface 42 that is adjusted to substantially the center height of the grinding wheel 18, and the mounting table 3 having a side edge of the sliding surface 42 as a guide, The sliding surface 42 includes a contact surface portion 33 that moves with the guides 43 on both sides attached to respective side edges of the sliding contact surface 42, and the projection shaft 2 protruding from the contact surface portion 33. The approach / separation mechanism is configured by a contact surface portion 33 that moves with guides 43, 43 attached to side edges of a sliding contact surface 42 of the mounting table 3. The contact surface 33 continuously projects the protrusion 29. The rotary blade 1 is fitted to the projection shaft 2 and moves toward and away from the grinding wheel operating unit 5 while moving integrally with the contact surface portion 33. In this example, similarly to the above example (see FIG. 8), the reference setting member 34 is fixed to the base 8, and the limiting plate 36 provided on the contact surface 33 is locked to the locking surface 37 of the reference setting member 34. Thus, the advance of the rotary blade 1 is limited.
[0028]
The reference setting member 34 only needs to be able to suppress or prevent the rotating blade 1 from excessively approaching the grinding wheel operating unit 5. Therefore, instead of the configuration shown in FIG. 9, FIG. 10 (a perspective view of another example of a polishing apparatus provided with a rotary blade holding portion 4 including a contact surface portion 33 that moves along the guide portion of the mounting table 3) and As shown in FIG. 11 (partial side view showing the function of the reference setting bolt 6), the reference setting bolt 6 is used as a reference setting member that is movable in the direction in which the rotary blade 1 approaches and separates from the grinding wheel operating unit 5. A configuration in which the front surface 44 of the mounting table 3 is used as a forward positioning portion that is screwed into a position setting plate 30 that is a position setting portion that hangs down from above and that a tip of the reference setting bolt 6 contacts. The contact surface portion 33 can prevent the rotating blade 1 from excessively approaching the polishing grindstone operation portion 5 by the reference setting bolt 6 that advances until the front end contacts the front surface 44.
[0029]
FIG. 12 is a perspective view of a further example of a polishing apparatus provided with a rotary blade holder 4 including a contact surface portion 33 that moves along a guide portion of the mounting table 3, and FIG. 13 shows a position setting provided on the contact surface portion 33. FIG. 6 is a partial side view showing the function of a reference setting bolt 6 screwed to a position setting plate 30 which is a part. In this example, a reference setting bolt 6 that is locked to the mounting table 3 in the direction in which the rotary blade 1 approaches the polishing wheel operating unit 5 is screwed into a position setting plate 30 that is a position setting unit attached to the contact surface 33, A configuration in which a compression spring 31 that repels the rotating blade 1 in a direction away from the grinding wheel operating unit 5 is attached to the reference setting bolt 6, thereby urging the projection shaft 2 in a direction in which the rotating blade 1 approaches the grinding wheel operating unit 5. It is. Thereby, the projection shaft 2 always moves forward due to the repulsion of the compression spring 31 and limits the retreat of the rotary blade 1, and the extension amount of the compression spring 31 limits the advance amount of the projection shaft 2, that is, the rotation blade 1 with respect to the grinding wheel 18. 1 can be prevented from approaching abnormally.
[0030]
【The invention's effect】
According to the present invention, it is necessary to firstly change (a) the polishing of the top blade and (b) the polishing of the belly blade in each of the rotary blades by means of the polishing wheel operating unit by replacing the polishing wheel (replacement of the electric polishing tool = grinder). , And can be realized with easy and fine adjustment. This absorbs the difference in the posture (particularly the horizontal angle of the polishing wheel) of the polishing wheel based on the various types of electric polishing tools having different structures, and brings about an effect that any electric polishing tool can be used similarly. By providing a rotary blade holder that moves only in the direction in which the rotary blade approaches and separates from the polishing wheel operating unit, accurate (a) polishing of the top blade and (b) accurate polishing of the belly blade are also possible. I do. Furthermore, by the reference setting material provided in the rotary blade operating section, and the bias of the rotary blade in the approaching direction to the grinding wheel, the device user presses the rotary blade to address the grinding wheel without paying particular attention. Alternatively, since only a simple operation such as pulling the rotary blade for blade feeding need be considered, the labor is reduced. The present invention has the effect of realizing easier and finer polishing of the rotary blade than in the past with such a simple operation.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a polishing apparatus provided with a rotary blade holding portion in which a projection shaft that moves in a direction in which a rotary blade approaches and separates from a mounting table;
FIG. 2 is a sectional view of a mounting table.
FIG. 3 is a plan view illustrating a polishing wheel operating unit.
FIG. 4 is a plan view showing a state in which a polishing wheel operating unit is horizontally turned in a direction orthogonal to a rotary blade.
FIG. 5 is a plan view showing a state in which the grinding wheel operating unit is horizontally turned toward the tangential direction of the rotary blade.
FIG. 6 is a perspective view illustrating a polishing apparatus provided with a reference setting bolt that is locked to a mounting table in a direction in which the rotary blade approaches the polishing wheel operating unit.
FIG. 7 is a partial side view showing the function of a reference setting bolt.
FIG. 8 is a perspective view showing a polishing apparatus provided with a rotary blade holding portion that moves by inserting a sliding leg of a mounting table having a projection shaft on a contact surface into a guide portion of a base.
FIG. 9 is a perspective view of a polishing apparatus provided with a rotary blade holding portion including a contact surface portion that moves along a guide portion of the mounting table.
FIG. 10 is a perspective view of another example of a polishing apparatus provided with a rotary blade holding portion including a contact surface portion that moves along a guide portion of a mounting table.
FIG. 11 is a partial side view showing the function of a reference setting bolt.
FIG. 12 is a perspective view of still another example of a polishing apparatus provided with a rotary blade holding portion including a contact surface portion that moves along a guide portion of a mounting table.
FIG. 13 is a partial side view showing a function of a reference setting bolt screwed into a position setting plate which is a position setting portion provided on the contact surface portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotary blade 2 Projection shaft 3 Mounting table 4 Rotary blade holder 5 Polishing grindstone operation part 6 Reference setting bolt 8 Base 11 Tool moving material 12 Tool mounting material 13 Electric polishing tool (grinder)
18 Polishing grindstone 21 Center engaging portion 22 Swivel engaging portion 23 Moving material long hole 24 Swiveling long hole 25 Contact surface 26 Contact long hole
