JP4326840B2

JP4326840B2 - Retainer

Info

Publication number: JP4326840B2
Application number: JP2003156730A
Authority: JP
Inventors: 保廣成澤; 均石川; 秀一江坂
Original assignee: NT Tool Corp
Current assignee: NT Tool Corp
Priority date: 2003-06-02
Filing date: 2003-06-02
Publication date: 2009-09-09
Anticipated expiration: 2023-06-02
Also published as: JP2004358569A

Description

【０００１】
【発明の属する技術分野】
本発明は、工作機械において、ドリル等の工具又は加工を施すべき被工作物を保持するようにした保持具に関する。
【０００２】
【従来の技術】
従来の保持具は、内側には工具又は被工作物等の被保持物（本明細書においては単に工具ともいう）を装着する為の保持孔を有し、外周は先細り状にした締着筒と、これの外周に位置させ、かつ締着筒にはめ合する回動筒と、締着筒と回動筒との間の間隙に、締着筒の軸線に対し適宜の傾斜角をなすようにした多数のローラを広範囲にわたり配列し、回動筒を回動させることによりローラが自転しつつ螺旋公転し、締着筒の収縮を行なわせてその内周面で被保持物を締着保持するようにしていた（例えば、特許文献１参照）。
【０００３】
さらに、従来においては図６（Ａ）（Ｂ）に示されるように、締着筒１０と回動筒１２との間に切り粉４０や切削油が入り込むのを防止する為に２つの環状形成のスペーサ２１、２２の間に、やはり環状形成のゴム等の弾性材製のシール２０を介在させ、これにより上記の切り粉４０や切削油の侵入を防止するようにしてある。
しかしそのままでは、保持具を回動させて切削加工に利用すると上記のシールは締着筒の軸芯方向に移動し、先端から抜け出す危険がある。
そこで従来より締着筒１０の先端部近くの外周に環状の溝２３を形成し、そこに一部に切目24aを持つ状態で環状になるように弾力材形成の止め輪（止部材ともいう）２４を、落込み状に嵌着して上記シールの抜け脱を防止するようにしてある。
【０００４】
【特許文献１】
特開平６−２９７２１５号公報（段落０００８、０００９、図１）
【０００５】
【発明が解決しようとする課題】
ところで最近は、工作機械における主軸の回転速度が２０，０００から３０，０００rpmへと、高速化しており、上記の「一部に切目を持つ状態で環状になるように弾力材形成の止め輪２４」は、主軸の回転速度が高まると遠心力により拡径して、落込み溝２３から浮き上がり、さらには高速回転中の保持具の先端から外側に向けて急速に飛び出す危険性があった。
さらには、「止め輪」が落込み溝２４から反復浮き沈みすると、その「止め輪」の外周には微細な切粉４０が付着しているので、「止め輪」の外周に付着していた微細な切粉が落込み溝２３に入り込み、やがては「止め輪２４」の復元を不可能にし、高速回転中の保持具の先端から外側に向けて飛び出すようになる問題点があった。
【０００６】
更に工具保持孔７から工具６の元部を抜き出して再装着する場合、治具との関係から締着筒１０は図６（Ａ）（Ｂ）のように締着筒１０の先端側10cが上向きになる。この状態で回動筒１２を回動操作して上下方向４１に進退させると、この回動筒１２には多くの微細な切り粉４０が付着しているので、それらの切り粉４０が締着筒１０の先端面及び回動筒１２と締着筒１０の間に降り注ぎ、「止め輪２４」の周囲に付着する。すると次に工具を高速回転させて切削加工に用いると、止め輪（止部材）の外周には微細な切粉４０が多く付着しているのでこれらが上記説明の場合と同様に、微細な切粉が落込み溝２３に入り込み、やがては「止め輪２４」の復元を不可能にする問題点が生じる。
【０００７】
本件出願の目的は、締着筒と回動筒との間に切り粉や切削油が入り込むのを防止できるようにした保持具を提供しようとするものである。
他の目的は、締着筒と回動筒との間に切り粉や切削油が入り込むのを防止するために環状形成のシール材料を具備させたものであっても、それが保持具の先端から飛び出さないように締着筒の先端部近くの外周に落込み溝（凹部）を周設し、そこに止部材を落込み状に嵌着して、環状形成のシール材料の脱出を防止するようにした保持具を提供しようとするものである。
他の目的は、主軸の回転速度が高まって、上記の止部材が遠心力により放射方向に移動しないように、即ち、嵌合凹部から浮き上がらないようにした保持具を提供しようとするものである。
他の目的は、上記止部材が遠心力により嵌合凹部から浮き上がらないようにその周囲を拡張防止用のリングで取り囲むようにするものであっても、そのリングは常時締着筒に一体化していて、工具保持孔から工具の元部を抜き出して再装着する作業の場合に、上下動させる回動筒に付着していた微細な切り粉が締着筒に向けて降り注いだ場合においても、回動筒の上下動作とは関係なく、締着筒に付着された状態を保って締着筒における止部材の周囲を微細な切り粉から守ることができるようにした保持具を提供しようとするものである。
他の目的及び利点は図面及びそれに関連した以下の説明により容易に明らかになるであろう。
【０００８】
【課題を解決するための手段】
本願発明における保持具は、半径方向に弾性変形可能な中空の筒状で、内側には先端を開口させた被保持物の保持孔を備え、外周面はテーパー面にしている締着筒と、
上記締着筒の周囲に間隙を隔てて相対回動可能に配設された回動筒と、
締着筒の外周面と回動筒の内周面との間隙に、締着筒に対し回動筒を相対回動させることにより回動筒を締着筒の軸線方向へ移動させて締着筒を収縮させてその内周面により被保持物を締着するように位置させた多数のローラと、
上記間隙におけるローラよりも先端寄りにおいて締着筒の周囲に設けられている凹部に嵌合させてある止部材とを備えている保持具において、
上記止部材の外周位置には、内側は止部材に嵌合一体化させ、外周は回動筒の内面に対して相対移動自在に拡張防止用のリングを周設させたものである。
【０００９】
また好ましくは、半径方向に弾性変形可能な中空の筒状で、内側には先端を開口させた被保持物の保持孔を備え、外周面はテーパー面にしている締着筒と、
上記締着筒の周囲に間隙を隔てて相対回動可能に配設された回動筒と、
締着筒の外周面と回動筒の内周面との間隙に、締着筒に対し回動筒を相対回動させることにより回動筒を締着筒の軸線方向へ移動させて締着筒を収縮させてその内周面により被保持物を締着するように位置させた多数のローラと、
上記間隙におけるローラよりも先端寄りにおいて締着筒の周囲に周設されている凹部に嵌合させてある環状の止部材とを備えている保持具において、
上記環状の止部材の外周位置には、内側は上記止部材に嵌合一体化させ、外周は回動筒の内面に対して相対移動自在に弾性材形成の拡張防止用のリングを周設させたものであればよい。
【００１０】
また好ましくは、上記拡張防止用のリングの先端側には、上記環状の止部材における先端側を覆うように内周に向けて突出させた切粉侵入防止用の覆い部材を具備させたものであればよい。
【００１１】
また好ましくは、半径方向に弾性変形可能な中空の筒状で、内側には先端を開口させた被保持物の保持孔を備え、外周面はテーパー面にしている締着筒と、
上記締着筒の周囲に間隙を隔てて相対回動可能に配設された回動筒と、
締着筒の外周面と回動筒の内周面との間隙に、締着筒に対し回動筒を相対回動させることにより回動筒を締着筒の軸線方向へ移動させて締着筒を収縮させてその内周面により被保持物を締着するように位置させた多数のローラと、
上記間隙におけるローラよりも先端寄りにおいて締着筒の周囲に周設されている凹部に嵌合させてある止部材とを備えている保持具において、
上記止部材の外周位置には、内側は止部材に当接し、外周は回動筒の内面に対して相対移動自在に拡張防止用のリングを周設させ、そのリングの奥側には、一体材でもって、内周に向けて突設させた位置決部材を備えさせ、さらにその奥側には断面が拡張、縮径を自在とする弾性材形成の押付リングを拡張状態においては上記位置決部材を止部材に押付可能に定着させたものであればよい。
【００１２】
また好ましくは、半径方向に弾性変形可能な中空の筒状で、内側には先端を開口させた被保持物の保持孔を備え、外周面はテーパー面にしている締着筒と、
上記締着筒の周囲に間隙を隔てて相対回動可能に配設された回動筒と、
締着筒の外周面と回動筒の内周面との間隙に、締着筒に対し回動筒を相対回動させることにより回動筒を締着筒の軸線方向へ移動させて締着筒を収縮させてその内周面により被保持物を締着するように位置させた多数のローラと、
上記間隙におけるローラよりも先端寄りにおいて締着筒の周囲に周設されている凹部に嵌合させてある止部材とを備えている保持具において、
上記止部材の外周位置には、内側は止部材に当接し、外周は回動筒の内面に対して相対移動自在に弾性材形成の拡張防止用のリングを周設させ、上記拡張防止用のリングの先端側には、上記環状の止部材における先端側を覆うように一体材でもって、内周に向けて突出させた覆い部材を具備させ、リングの奥側には、一体材でもって、内周に向けて突設させた係合部材を備えさせたものであればよい。
【００１３】
また好ましくは、半径方向に弾性変形可能な中空の筒状で、内側には先端を開口させた被保持物の保持孔を備え、外周面はテーパー面にしている締着筒と、上記締着筒の周囲に間隙を隔てて相対回動可能に配設された回動筒と、締着筒の外周面と回動筒の内周面との間隙に、締着筒に対し回動筒を相対回動させることにより回動筒を締着筒の軸線方向へ移動させて締着筒を収縮させてその内周面により被保持物を締着するように位置させた多数のローラと、上記間隙におけるローラよりも先端寄りにおいて締着筒の周囲に設けられている凹部に嵌合させてある止部材とを備えている保持具において、上記凹部は、締着筒の周囲複数個所に設けられ、夫々は軸芯方向に深い孔であり、止部材は球状に形成され、上記複数個所に設けられた各軸芯方向に深い孔に対して出没可能に備えさせてあり、上記球状の止部材の外周位置には、内側は上記締着筒の外周に接し、かつ上記球状の止部材に嵌合することによって、横ずれが阻止されており、外周は回動筒の内面に対して相対移動自在に接近させている弾性材形成の拡張防止用のリングを配設したものであればよい。
【００１４】
【発明の実施の形態】
以下本願発明の実施の形態を示す図面について説明する。図１乃至図５において、符号１〜２４は通常広く知られた構成である。１は本体、２はその元部に備わった連結部で、工作機のスピンドルに取付けるようにした部分である。８は連結孔で、例えば公知のプルスタッドを備えさせる。また冷却液を通す。
３は本体１の一端に一体的に連設具備された締着部で、上記被保持物を着脱自在に保持する部分である。４は鍔部で周囲には操作用の凹溝を有する。１０は締着筒で、
半径方向に弾性変形可能な中空の筒状体で、内側には先端側を開口させた被保持物６を抜き差し装着する為の保持孔７を備え、外周面10aは先細り状のテーパー面にしている。１２は回動筒で、上記締着筒の周囲に間隙１１を隔てて相対回動可能に配設されている。
締着筒１０の外周面10aと回動筒１２の内周面12aとの間隙１１には、締着筒１０に対し回動筒１２を相対回動させることにより回動筒１２を締着筒１０の軸線方向へ移動させて締着筒１０を収縮させてその内周面10bにより被保持物６を締着するように位置させた多数のローラ１４が配置されている。１５はリテーナーを示す。１６、１７、１８は、後方から切り粉や切削油が入り込むのを防止する為に夫々配設された環状のゴムシールと、防塵リングと、パッキンを示す。
【００１５】
環状のシール２０は、締着筒１０と回動筒１２との間のローラー１４の部分に切り粉や切削油が入り込むのを防止する為に図２に示されるように２つの環状形成の金属材でなるスペーサ２１、２２の間に配置したもので、通常ゴム、合成樹脂等の弾性材料で形成されている。
２４は弾力性のある金属材料で、一部に装着の利便性を図る為に形成されている切目24aを持つ環状形成の止部材（止め輪）で、締着筒１０の先端部10c近くの外周に環状の溝２３を形成し、その溝２３に対して、上記切目24aを広げる状態で全体を弾力的に拡径させ、着脱自在に落込み、その落込み状態で嵌着し、上記シール２０の抜け脱を防止するようにしてある。
【００１６】
２７は弾力性のある材料、例えば合成樹脂、硬質合成ゴム材料で環状に形成された拡張防止用のリングで、止部材２４の外周位置に着脱自在配置させてある。
上記拡張防止用のリング２７の形状は、内側は止部材２４に当接し、外周27aは回動筒の内面12aに対して相対移動自在になる範囲で極めて小さな間隙が形成される程度に近づく厚みに設定してある。
拡張防止用のリング２７の厚みの目安としては、締着筒１０が高速回転した状態に於いて止部材２４が遠心力により放射方向に浮き上がる状態になったとき、溝２３から外れる寸前に拡張防止用のリング２７に当たって、止部材２４が放射方向へ浮き上がって溝２３から外れるのを阻止できるに十分な厚みがあればよい。
２８はリング２７と一体材で成型した覆い部材で、リング２７の先端側において、図２（Ｃ）に現れているように上記環状の止部材２４における先端側を覆うように対応させた形状にし、内周に向けて突出させた切粉侵入防止用の覆い部材である。３０はリング２７と一体材で成型した内向き突出状の係合部材で、図２（Ｃ）に現れているようにリング２７の装着状態においては、環状の止部材２４の内側に弾力的に係合し、止部材２４の外周が、リング２７の内周における嵌合凹部２９に嵌合して、リング２７が先端側に抜け脱しないようにしたものである。
【００１７】
上記構成のものの組立を図２（Ａ）〜（Ｃ）を用いて説明する。締着筒１０と、回動筒１２と、ローラ１４との組み合わせ、ゴムシール２０の配設、凹部２３に対する止部材２４の装着等は、広く知られた手法でその組み付けは行われる。図２（Ｅ）に現れている環状の拡張防止用のリング２７の装着は、図２（Ａ）、（B）から明らかなように締着筒１０と回動筒１２との間に形成される環状の間隙１１に対して、リング２７の軸芯５（図１参照）と締着部３の軸芯５とが一致する状態で軸芯に平行する方向へ横滑り状態で横滑り状に挿入する。この場合内側に向けて突出させてある係合部３０が邪魔になるが、これには弾力があるので強い力を加えて変形させた状態で押し込み、図２（C）の押し込み完了状態で復元させる。
【００１８】
上記構成のものにあっては、工具保持孔７に工具６の元部を挿入し、回動筒１２を回動させて締着筒１０を縮径させて工具６を一体化させて高速回転状態で機械加工に使用する。その高速回転状態においては、止部材２４は高速回転に伴う遠心力の作用を受けて拡径する（直径が大きくなる）。しかし止部材２４の外周位置には図２（Ｃ）のようにリング２７が配置されているので、これの存在に邪魔されて大きく拡径することはできず、止部材２４が溝２３から脱出することは防止される。
【００１９】
次に工具保持孔７から工具６の元部を抜き出して再装着する場合について説明する。この場合、治具との関係から締着部３は図２（D）のように締着筒１０の先端側10cが上向きになる。この状態で回動筒１２を回動を操作して上下方向（矢印４１方向）に進退させると、この回動筒１２には多くの微細な切り粉が付着しているので、それらの切り粉が締着筒１０の先端面及び回動筒１２と締着筒１０の間に降り注ぐことになる。しかし実施例に示されるものは、切れ目24aを備える止部材２４の上端面は主体部２７と覆い部材２８とで覆われており、切粉が切れ目24aを通過して内部に侵入することを防止する。この切粉の侵入防止効果は、回動筒１２を回動させて上下方向（矢印４１）に進退させても、リング２７は締着筒１０の側に対して付着されているので、回動筒１２を回動させも、上下方向（矢印４１方向）に進退させてもそれの影響は受けない利点がある。
【００２０】
次に、図１、図２の締着部３における拡張防止用のリング２７に係わる構成とは異なる例を示す図３について説明する。
拡張防止用のリング３２は、弾性材例えばゴム材、合成樹脂材で環状に形成されており、止部材２４の外周位置に周設されており、内側は止部材２４に当接し、外周32aは回動筒の内面12aに対して相対移動自在になる範囲で切り粉の通過を妨げるように極めて僅かな間隙が残る範囲で近づく厚みに形成されている。
図３（A）〜（Ｃ）に現れているようにリング３２の奥側には、一体材でもって内周に向けて突設させた環状の位置決部材３３を備える。
さらにその奥側には断面が拡張、縮径を自在とする弾性材で環状に形成された押付リング３４が配設してある。この押付リング３４を拡張させた状態（復元膨張した状態）においては上記位置決部材３３を止部材２４に押付けるように定着させてある。この定着手段は、締着筒１０の周囲に設けた段部４２に環状の金属材製のスペーサ２１を固着し、それの前側に図示のように添わせた状態で、かつ締着筒１０の外面10aと回動筒１２の内面12aに夫々密着する状態に設けてある。従ってこの押付リング３４は前記のゴムシール２０と同様の働きがある。
【００２１】
次に図３（Ａ）〜（Ｃ）に現れる締着部３の構成のものについての組立は、（Ｂ）図におけるスペーサ２１と、押付リング３４と、止部材２４を夫々図示の状態に組み付け、その後、環状のリング３２と位置決部材３３とをそれの弾性力を利用し、リング３２の軸芯５と締着部３の軸芯５とが一致する状態で軸芯方向へ横滑り状態で、かつ押付リング３４を押し縮めて（Ｂ）図の位置に押し込む。（Ｂ）図の状態で押し込み力を取り去ると押付リング３４は（Ｃ）図のように復元して膨らみ、位置決部材３３を止部材２４の側面に押し付けると共に、拡張防止用のリング３２を止部材２４の外周位置に定着させる。なお止部材２４の装着順は、リング３２を（Ｃ）図の位置に押し込んだ後に環状の溝２３に嵌着させても良い。
【００２２】
上記構成の締着部３について、工具６を装着し、高速回転状態で機械加工に使用する場合には、その高速回転状態において、止部材２４は高速回転に伴う遠心力の作用を受けて拡径する。しかし止部材２４の外周位置には図３（Ｃ）のようにリング３２が配置されているので、これの存在に邪魔されて大きく拡径することはできず、止部材２４が溝２３から脱出することは防止される。
また、回転筒１２を進退させたときの切り粉、油などの侵入物は、拡張防止用のリング３２と、位置決部材３３の存在により二重に阻止される。
【００２３】
次に、図１〜図３の締着部３における拡張防止用のリング２７、３２に係わる構成とは異なる例を示す図４について説明する。
拡張防止用のリング３６は、弾性材例えばゴム材、合成樹脂材で環状に形成されており、止部材２４の外周位置に周設されている。内側は止部材２４に当接し、外周は回動筒の内面12aに対して相対移動自在になるように極めて僅かな間隙が残る範囲で近づく厚みに形成されている。リング３６の内周側の断面形状は、
中央部に止部材２４の外周面に対応する角形又は円弧状の凹溝36bを形成する。図４の場合、止部材２４の断面が円形のものを例示するので、凹溝36bも半円弧にして嵌合を可能にしてある。【？】ある。
先端側には覆部材36dを張り出し、後端側には係合部材36cが形成されるようにしてある。リング３６の一部には装着作業の容易性を考慮して切れ目36aが形成してある。しかしその切れ目36aは図４（A）（B）に現れているよう装着状態においては合着する寸法にしてあり、そこから切り粉が侵入する恐れはない。
【００２４】
次に図４（Ａ）、（Ｂ）に現れる締着部３の構成のものについての組立は、（A）図におけるスペーサ２１と、ゴムシール２０と、止部材２４とを夫々図示の状態に組み付け、その後、環状のリング３６をそれの弾性力を利用し、切れ目36aを先頭にして止部材２４の外周を滑らすような状態で図示の位置に差込む。この切れ目36a の存在により、装着作業は極めて楽になる。
上記構成の締着部３について、工具６を装着し、高速回転状態で機械加工に使用する場合には、その高速回転状態において、止部材２４は高速回転に伴う遠心力の作用を受けて拡径する。しかし止部材２４の外周位置には図４（A、B）のようにリング３６が配置されているので、これの存在に邪魔されて大きく拡径することはできず、止部材２４が溝２３から脱出することは防止される。
なお、切れ目24aを備える止部材２４の上側は環状のリング３６の主体部と覆い部材36dとで覆われており、切粉が切れ目24aを通過して内部に侵入することは防止される。
【００２５】
次に、図１〜図４の締着部３における拡張防止用のリングに係わる構成とは異なる例を示す図５について説明する。
拡張防止用のリング４６は、弾性材例えばゴム材、合成樹脂材で環状に形成されており、球状の止部材４７の外周位置に周設されている。リング４６の内側は図５（Ｄ）に現れているように、多くの部分で締付筒１０の外周10aに当接し、一部において球状の止部材４７に当接し、外周は回動筒の内面12aに対して相対移動自在になるように極めて僅かな間隙が残る範囲で近づく厚みに形成されている。リング４６の内周側における止部材４７に対向する部分は、止部材４７の外周面に対応する凹部46aを形成し、嵌合を可能にしてある。図５の場合、止部材４７の断面が球状のものを例示するので、凹部46aも半円球にしてある。凹部46aの
先端側には覆部材46bを張り出し、後端側には係合部材46cが形成されるようにしてある。
【００２６】
次に凹部４８は、締着筒１０の周囲には任意の複数個所、例えば図５（Ｄ）又は図５（Ｅ）に現れているように４個所又は３個所に等分割の状態で設けられ、夫々は軸芯５が位置する内側に向けて深い貫通孔にしてある。内径は止部材４７の上下動を可能にする範囲で対応する小さな径にしてある。球状の止部材４７は、複数個所に設けられた上記の深い孔４８の夫々に対して一部が埋没される状態で納められている。
４９は、締着筒１０の先端から上記凹部４８の底側に向けて設けた雌ねじ孔を示し、図５（Ｂ）に示されているように雌ねじ孔４９の中に向けて球状の止部材４７が降下して突出（又は落下）できるようにしてある。５０は雄ねじ棒を示し、ドライバーなどの任意の工具を用いて回動させることにより図５（Ｃ）に現れるように雌ねじ孔４９の中に向けて侵入可能にしてある。雄ねじ棒５０を雌ねじ孔４９の中に挿入した状態では、止部材４７は放射方向に向けて押し上げられ、
図示のようにリング４６の凹部46aに嵌合する。
また、図５（Ｂ）に示される球状の止部材４７の下側近くに雄ねじ棒５０の先頭を停止させておけば、止部材４７の外周側の面はリング４６の凹部46aから図示のように離れ、リング４６の装着、離脱作業を容易にする効果がある。この作業の場合、止部材４７の内周側の面は雄ねじ棒５０の先頭に支えられて雌ねじ孔４９の中に向けて脱出することは防げる。
【００２７】
次に図５（Ａ）〜（Ｄ）に現れる締着部３の構成のものについての組立は、（Ｂ）図におけるスペーサ２１と、ゴムシール２０とを夫々図示の状態に組み付け、更に複数個所の凹部４８の夫々に球状の止部材４７を図５（Ｂ）に示されるような状態で存置させる。その後、環状のリング４６をそれの弾性力を利用し、リング４６の軸芯５と締着部３の軸芯５とが一致し、リング４６の凹部46aが止部材４７に対応させ得る状態で軸芯方向へ横滑り状態で図示の位置に差込む。この状態で、各雌ねじ孔４９について雄ねじ棒５０を雌ねじ孔４９の中に向けて螺合侵入させると、各球状の止部材４７は放射方向に図示の如き寸法だけ移動し、リング４６の凹部46aと嵌合状態となってリング４６及びゴムシール２０の抜け脱を防止する。
【００２８】
上記構成の締着部３について、工具６を装着し、高速回転状態で機械加工に使用する場合には、その高速回転状態において、止部材４７は高速回転に伴う遠心力の作用を受けて放射方向に移動しようとする。しかし止部材４７の外周位置には図５（Ｃ）（Ｄ）（Ｅ）のようにリング４６が配置されているので、これの存在に邪魔されて大きく移動することはできず、止部材４７が凹部４８から脱出することは防止される。
【００２９】
なお、図３〜図６の説明において、前述の図１、図２のものと機能、性質又は特徴等が同一又は均等構成と考えられる部分には、重複した説明を避けるために前述の図１、図２と同一の符号を付して重複する説明を省略した。
【００３０】
【発明の効果】
以上のように本願発明は、主軸の回転速度が高まっても、止部材２４の外周位置には、拡張防止用のリング２７を周設するものであるから、止部材２４が遠心力により放射方向に大きく移動しない、即ち、嵌合凹部２３から大きく浮き上がることのないようにできる効果がある。
更に本願発明にあっては、止部材２４が遠心力により嵌合凹部２３から浮き上がらないようにその周囲に拡張防止用のリング２７を配置したものであっても、そのリング２７は常時締着筒１０に一体化させて、工具保持孔７から工具６の元部を抜き出して再装着する作業の場合に、上下動させる（矢印４１方向に移動させる）回動筒１２に微細な切り粉が付着していて、締着筒１０に向けて降り注いだ場合においても、リング２７は回動筒１２の上下動作とは関係なく、締着筒１０に常時付着された状態を保って、締着筒１０における止部材２４の周囲を微細な切り粉が通るのを守ることができ、これにより切り粉がシール２０に向けて進入する度合いを著しく減少させる画期的効果がある。
【図面の簡単な説明】
【図１】工具の断面図。
【図２】（Ａ）は、締付部においてリング２７を装着する寸前の要部拡大断面図、（Ｂ）はリング２７を装着する過程での要部拡大断面図、（Ｃ）は、リング２７を装着した状態の要部拡大断面図、（Ｄ）は、締付部を上向きにし回動筒を上昇させた状態の要部拡大断面図、（Ｅ）は、止部材とリングとを示す斜視図。
【図３】（Ａ）は、図２に示される締付部とは異なる例を示す要部断面図、（Ｂ）は、リング３２を装着する過程での要部拡大断面図、（Ｃ）は、リング３２を装着した状態の要部拡大断面図、（Ｄ）は、押付リング３４とリング３２と止部材２４とを示す斜視図。
【図４】（Ａ）は、図２、３に示される締付部とは異なる例を示す要部断面図、（Ｂ）は、ＩＶ−ＩＶ線断面図、（Ｃ）は、リング３６と止部材２４とを示す斜視図。
【図５】（Ａ）は、図２、３、４に示される締付部とは異なる例を示す要部断面図、（Ｂ）は、リング４６を装着する過程での要部拡大断面図、（Ｃ）は、リング４６を装着した状態の要部拡大断面図、
（Ｄ）と（Ｅ）は、異なる事例を示すＶ−Ｖ線断面図。
【図６】従来の工具において（Ａ）は、工具取り換えの為に切り粉が付着している回転筒を上昇させた状態の要部拡大断面図、（Ｂ）は、締付部の回転筒を下降させ、締付筒に切り粉が落下した状態の拡大要部断面図。
【符号の説明】
１・・・本体、
３・・・締着部、
６・・・被保持物、
１０・・・締着筒、
１１・・・間隙、
１２・・・回動筒、
２３・・・凹部、
２４・・・止部材、
２７・・・拡張防止用のリング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a holding tool configured to hold a tool such as a drill or a workpiece to be processed in a machine tool.
[0002]
[Prior art]
A conventional holder has a holding hole for mounting a holding object such as a tool or a workpiece (also simply referred to as a tool in this specification) on the inside, and a fastening cylinder whose outer periphery is tapered. And an appropriate inclination angle with respect to the axis of the fastening cylinder in the gap between the fastening cylinder and the turning cylinder positioned on the outer periphery of the fastening cylinder and the fastening cylinder. A large number of rollers are arranged in a wide range, and when the rotating cylinder is rotated, the roller rotates and revolves spirally, and the fastening cylinder is contracted to hold the object to be held in its inner peripheral surface. (For example, refer to Patent Document 1).
[0003]
Furthermore, in the prior art, as shown in FIGS. 6A and 6B, two annular formations are provided to prevent chips 40 and cutting oil from entering between the fastening cylinder 10 and the rotating cylinder 12. A seal 20 made of an elastic material such as an annular rubber is also interposed between the spacers 21 and 22 so as to prevent the chips 40 and cutting oil from entering.
However, as it is, if the holder is rotated and used for cutting, the above seal moves in the axial direction of the fastening cylinder, and there is a risk of coming out of the tip.
Therefore, an annular groove 23 is formed in the outer periphery near the tip of the fastening cylinder 10 and a retaining ring (also referred to as a stop member) formed with an elastic material so as to be annular with a notch 24a in a part thereof. 24 is fitted in a drop shape to prevent the seal from coming off.
[0004]
[Patent Document 1]
JP-A-6-297215 (paragraphs 0008, 0009, FIG. 1)
[0005]
[Problems to be solved by the invention]
Recently, the rotational speed of the spindle in a machine tool has been increased from 20,000 to 30,000 rpm. "Has a risk that when the rotation speed of the main shaft is increased, the diameter is increased by the centrifugal force, and is lifted from the drop groove 23, and further rapidly jumps outward from the tip of the holder during high-speed rotation.
Furthermore, when the “retaining ring” repeatedly floats and sinks from the drop groove 24, fine chips 40 adhere to the outer periphery of the “retaining ring”, so the fineness that has adhered to the outer periphery of the “retaining ring”. There is a problem that the chip enters the dropping groove 23 and eventually makes it impossible to restore the “retaining ring 24” and jumps outward from the tip of the holder during high-speed rotation.
[0006]
Furthermore, when the base part of the tool 6 is extracted from the tool holding hole 7 and remounted, the fastening cylinder 10 has a distal end side 10c of the fastening cylinder 10 as shown in FIGS. Become upward. In this state, when the rotating cylinder 12 is rotated and moved forward and backward in the vertical direction 41, a lot of fine chips 40 are attached to the rotating cylinder 12, so that the chips 40 are fastened. It pours down between the tip surface of the cylinder 10 and between the rotating cylinder 12 and the fastening cylinder 10 and adheres around the “retaining ring 24”. Then, when the tool is rotated at a high speed and used for cutting, a large amount of fine chips 40 adhere to the outer periphery of the retaining ring (stopping member). The powder enters the dropping groove 23 and eventually causes a problem that makes it impossible to restore the “retaining ring 24”.
[0007]
An object of the present application is to provide a holder that can prevent chips and cutting oil from entering between a fastening cylinder and a rotating cylinder.
Another object is to provide an annular sealing material to prevent chips and cutting oil from entering between the fastening cylinder and the rotating cylinder, even if it is provided with the tip of the holder. A drop groove (recess) is provided on the outer periphery near the tip of the fastening cylinder so that it does not jump out of the tube, and a stop member is fitted into the drop cylinder to prevent the annular seal material from escaping. An object of the present invention is to provide a holding tool.
Another object is to provide a holder in which the rotation speed of the main shaft is increased so that the above-described stop member does not move in the radial direction due to centrifugal force, that is, does not float from the fitting recess. .
Another purpose is to surround the periphery of the stop member with an expansion preventing ring so that the stop member does not float from the fitting recess due to centrifugal force. In the case of removing the tool base from the tool holding hole and remounting it, even if fine chips adhering to the rotating cylinder that moves up and down fall down toward the fastening cylinder, An object of the present invention is to provide a holder capable of protecting the periphery of a fastening member in a fastening cylinder from fine chips regardless of the vertical movement of the moving cylinder. It is.
Other objects and advantages will be readily apparent from the drawings and the following description associated therewith.
[0008]
[Means for Solving the Problems]
The holder in the present invention is a hollow cylinder that can be elastically deformed in the radial direction, and is provided with a holding hole for an object to be held with an opening at the inside, a fastening cylinder whose outer peripheral surface is a tapered surface,
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In a holder provided with a stopper member fitted in a recess provided around the fastening tube closer to the tip than the roller in the gap,
At the outer peripheral position of the stop member, the inner side is fitted and integrated with the stop member, and the outer periphery is provided with a ring for preventing expansion relative to the inner surface of the rotating cylinder.
[0009]
Preferably, the fastening tube is a hollow tube that can be elastically deformed in the radial direction, provided with a holding hole for an object to be held with an opening at the inside, and an outer peripheral surface having a tapered surface;
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In holder and an annular stop member that is fitted to the concave portion, which is circumferentially provided around the fastening sleeve at the distal nearer rollers in the gap,
At the outer peripheral position of the annular stop member, the inner side is fitted and integrated with the stop member, and the outer periphery is provided with a ring for preventing expansion of elastic material so that it can move relative to the inner surface of the rotating cylinder. Anything can be used.
[0010]
Preferably, the expansion preventing ring is provided with a covering member for preventing chip intrusion protruding toward the inner periphery so as to cover the distal end side of the annular stop member. I just need it.
[0011]
Preferably, the fastening tube is a hollow tube that can be elastically deformed in the radial direction, provided with a holding hole for an object to be held with an opening at the inside, and an outer peripheral surface having a tapered surface;
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In holder and a stop member that is fitted to the concave portion, which is circumferentially provided around the fastening sleeve at the distal nearer rollers in the gap,
At the outer peripheral position of the stopper member, the inner side is in contact with the stopper member, and the outer periphery is provided with a ring for preventing expansion so as to be relatively movable with respect to the inner surface of the rotating cylinder. A positioning member that protrudes toward the inner periphery is provided with a material, and a pressing ring formed of an elastic material that can be expanded and contracted in cross section on the inner side is positioned in the expanded state. Any member may be used as long as the member is fixed to the stop member so as to be pressed.
[0012]
Preferably, the fastening tube is a hollow tube that can be elastically deformed in the radial direction, provided with a holding hole for an object to be held with an opening at the inside, and an outer peripheral surface having a tapered surface;
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In holder and a stop member that is fitted to the concave portion, which is circumferentially provided around the fastening sleeve at the distal nearer rollers in the gap,
At the outer peripheral position of the stop member, the inner side is in contact with the stop member, and the outer periphery is provided with an expansion preventing ring for elastic material formation so as to be relatively movable with respect to the inner surface of the rotating cylinder. On the tip side of the ring, an integral material is provided so as to cover the tip side of the annular stop member, and a cover member is provided that protrudes toward the inner periphery. What is necessary is just to provide the engaging member projected toward the inner periphery.
[0013]
Preferably, the fastening tube has a hollow cylindrical shape that can be elastically deformed in the radial direction, and has a holding hole for an object to be held with an opening at the inside, and a tapered outer peripheral surface. A rotating cylinder is disposed with respect to the fastening cylinder in a gap between a rotating cylinder disposed around the cylinder so as to be relatively rotatable with a gap therebetween, and an outer peripheral surface of the fastening cylinder and an inner peripheral surface of the rotating cylinder. A plurality of rollers positioned so as to move the rotating cylinder in the axial direction of the fastening cylinder by relative rotation to contract the fastening cylinder and fasten the object to be held by the inner peripheral surface thereof; A holding member fitted to a recess provided around the fastening tube at a position closer to the tip than the roller in the gap, wherein the recess is provided at a plurality of locations around the fastening tube. , Each of which is a deep hole in the axial direction, the stop member is formed in a spherical shape, and each axial core provided at the plurality of locations In the outer peripheral position of the spherical stop member, the inner side is in contact with the outer periphery of the fastening tube, and is fitted to the spherical stop member. Any lateral displacement is prevented, and the outer periphery may be provided with an expansion preventing ring formed of an elastic material that is relatively close to the inner surface of the rotating cylinder.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, drawings showing embodiments of the present invention will be described. 1 to 5, reference numerals 1 to 24 are generally well-known configurations. Reference numeral 1 denotes a main body, and 2 denotes a connecting portion provided at a base portion thereof, which is a portion that is attached to a spindle of a machine tool. 8 is a connection hole, for example, a known pull stud is provided. Pass the coolant.
Reference numeral 3 denotes a fastening portion that is integrally connected to one end of the main body 1, and is a portion that detachably holds the object to be held. Reference numeral 4 denotes a collar, which has a concave groove for operation around it. 10 is a fastening tube,
It is a hollow cylindrical body that can be elastically deformed in the radial direction, and is provided with a holding hole 7 for inserting / removing the object to be held 6 having an open end on the inner side, and the outer peripheral surface 10a has a tapered tapered surface. Yes. A rotating cylinder 12 is disposed around the fastening cylinder so as to be relatively rotatable with a gap 11 therebetween.
In the gap 11 between the outer peripheral surface 10 a of the fastening tube 10 and the inner peripheral surface 12 a of the rotating tube 12, the rotating tube 12 is rotated relative to the fastening tube 10, whereby the rotating tube 12 is fastened. A number of rollers 14 are arranged so as to move in the axial direction of 10 to contract the fastening cylinder 10 and fasten the object 6 to be held by the inner peripheral surface 10b. Reference numeral 15 denotes a retainer. Reference numerals 16, 17 and 18 denote an annular rubber seal, a dust-proof ring, and a packing, which are respectively disposed to prevent chips and cutting oil from entering from behind.
[0015]
The annular seal 20 is formed of two annularly formed metals as shown in FIG. 2 in order to prevent chips and cutting oil from entering the portion of the roller 14 between the fastening cylinder 10 and the rotating cylinder 12. It is arranged between the spacers 21 and 22 made of a material, and is usually formed of an elastic material such as rubber or synthetic resin.
Reference numeral 24 denotes an elastic metal material, which is an annular formed retaining member (retaining ring) having a notch 24a formed in part for convenience of mounting, and is located near the tip 10c of the fastening cylinder 10. An annular groove 23 is formed on the outer periphery. The entire groove 24a is elastically expanded in a state where the cut 24a is widened, is detachably dropped, is fitted in the depressed state, and the seal 20 is prevented from coming off.
[0016]
Reference numeral 27 denotes an expansion preventing ring formed in an annular shape with an elastic material, for example, a synthetic resin or a hard synthetic rubber material, and is detachably disposed at the outer peripheral position of the stopper member 24.
The expansion preventing ring 27 is shaped so that the inner side abuts against the stopper member 24 and the outer periphery 27a is close to the extent that a very small gap is formed within a range in which it can move relative to the inner surface 12a of the rotating cylinder. It is set to.
As a guideline for the thickness of the expansion preventing ring 27, when the fastening cylinder 10 is rotated at a high speed and the stop member 24 is lifted in the radial direction by the centrifugal force, the expansion prevention is performed just before it is detached from the groove 23. The stop member 24 only needs to have a sufficient thickness so as to prevent the stop member 24 from being lifted in the radial direction and coming off the groove 23.
Reference numeral 28 denotes a cover member formed of an integral material with the ring 27, and has a shape corresponding to cover the front end side of the annular stop member 24 on the front end side of the ring 27 as shown in FIG. A covering member for preventing chip intrusion protruding toward the inner periphery. Reference numeral 30 denotes an inwardly projecting engaging member formed of a single material with the ring 27. As shown in FIG. 2C, when the ring 27 is mounted, the engaging member is elastically formed inside the annular stop member 24. The outer periphery of the stop member 24 is engaged with the fitting recess 29 in the inner periphery of the ring 27 so that the ring 27 does not come off to the tip side.
[0017]
The assembly of the above structure will be described with reference to FIGS. The combination of the fastening cylinder 10, the rotating cylinder 12, and the roller 14, the arrangement of the rubber seal 20, the attachment of the stop member 24 to the recess 23, and the like are performed by a widely known technique. The annular expansion preventing ring 27 appearing in FIG. 2 (E) is formed between the fastening cylinder 10 and the rotating cylinder 12 as is apparent from FIGS. 2 (A) and 2 (B). Is inserted in a side-sliding manner in a side-sliding direction in a direction parallel to the axis when the axis 5 (see FIG. 1) of the ring 27 and the axis 5 of the fastening portion 3 coincide with each other. . In this case, the engaging portion 30 that protrudes inward becomes an obstacle, but since this has elasticity, it is pushed in with a strong force and deformed, and restored in the pushing-in completed state in FIG. 2 (C). Let
[0018]
In the above configuration, the base of the tool 6 is inserted into the tool holding hole 7, the rotating cylinder 12 is rotated, the fastening cylinder 10 is reduced in diameter, and the tool 6 is integrated to rotate at high speed. Used for machining in state. In the high-speed rotation state, the stop member 24 expands in diameter due to the action of centrifugal force accompanying high-speed rotation (the diameter increases). However, since the ring 27 is disposed at the outer peripheral position of the stop member 24 as shown in FIG. 2C, the stop member 24 cannot escape from the groove 23 due to the presence of the ring 27. Doing so is prevented.
[0019]
Next, the case where the base part of the tool 6 is extracted from the tool holding hole 7 and remounted will be described. In this case, due to the relationship with the jig, the fastening portion 3 has the tip side 10c of the fastening tube 10 facing upward as shown in FIG. In this state, if the rotating cylinder 12 is operated to rotate up and down (in the direction of the arrow 41), a lot of fine chips are attached to the rotating cylinder 12. Falls between the distal end surface of the fastening tube 10 and the rotating tube 12 and the fastening tube 10. However, what is shown in the embodiment is that the upper end surface of the stop member 24 having the cut 24a is covered with the main body 27 and the covering member 28, and prevents chips from entering the inside through the cut 24a. To do. Even if the turning cylinder 12 is rotated and moved forward and backward (arrow 41), the ring 27 is attached to the fastening cylinder 10 side. There is an advantage that even if the tube 12 is rotated, it is not affected by the vertical movement (in the direction of the arrow 41).
[0020]
Next, FIG. 3 showing an example different from the configuration relating to the expansion preventing ring 27 in the fastening portion 3 of FIGS. 1 and 2 will be described.
The expansion preventing ring 32 is formed in an annular shape with an elastic material such as a rubber material or a synthetic resin material, and is provided around the outer peripheral position of the stop member 24. The inner side abuts on the stop member 24, and the outer periphery 32a is It is formed to a thickness that approaches a very small gap so as to prevent the passage of chips within a range in which it can move relative to the inner surface 12a of the rotating cylinder.
As shown in FIGS. 3A to 3C, an annular positioning member 33 is provided on the inner side of the ring 32 so as to project toward the inner periphery with an integral material.
Further, a pressing ring 34 formed in an annular shape with an elastic material whose cross section can be expanded and reduced in diameter is disposed on the inner side. In the state where the pressing ring 34 is expanded (restored and expanded), the positioning member 33 is fixed so as to be pressed against the stop member 24. In this fixing means, a spacer 21 made of an annular metal material is fixed to a step portion 42 provided around the fastening cylinder 10 and is attached to the front side thereof as shown in the figure, and the fastening cylinder 10 The outer surface 10a and the inner surface 12a of the rotating cylinder 12 are provided in close contact with each other. Therefore, the pressing ring 34 has the same function as the rubber seal 20 described above.
[0021]
3 (A) to 3 (C), the assembly of the fastening portion 3 is assembled by assembling the spacer 21, the pressing ring 34, and the stop member 24 in the state shown in FIG. 3 (B). Thereafter, the annular ring 32 and the positioning member 33 are made to slide in the axial direction in a state where the axial core 5 of the ring 32 and the axial core 5 of the fastening portion 3 coincide with each other by utilizing the elastic force thereof. Then, the pressing ring 34 is pressed and contracted (B) to the position shown in the figure. (B) When the pushing force is removed in the state shown in the figure, the pressing ring 34 is restored and swells as shown in (C), and the positioning member 33 is pressed against the side surface of the stopping member 24 and the expansion preventing ring 32 is stopped. Fixing is performed at the outer peripheral position of the member 24. The stop member 24 may be mounted in the annular groove 23 after the ring 32 is pushed into the position shown in FIG.
[0022]
When the tool 6 is attached to the fastening portion 3 having the above-described configuration and used for machining in a high-speed rotation state, the stop member 24 is expanded under the action of the centrifugal force accompanying the high-speed rotation in the high-speed rotation state. Diameter. However, since the ring 32 is disposed at the outer peripheral position of the stop member 24 as shown in FIG. 3C, the diameter of the stop member 24 cannot be increased due to the presence of the ring 32, and the stop member 24 escapes from the groove 23. Doing so is prevented.
Intruders such as chips and oil when the rotary cylinder 12 is advanced and retracted are double-blocked by the presence of the expansion preventing ring 32 and the positioning member 33.
[0023]
Next, FIG. 4 showing an example different from the configuration related to the expansion preventing rings 27 and 32 in the fastening portion 3 of FIGS. 1 to 3 will be described.
The expansion preventing ring 36 is formed in an annular shape from an elastic material such as a rubber material or a synthetic resin material, and is provided around the outer peripheral position of the stopper member 24. The inner side is in contact with the stop member 24, and the outer periphery is formed with a thickness approaching within a very small gap so that it can move relative to the inner surface 12a of the rotating cylinder. The cross-sectional shape of the inner periphery side of the ring 36 is
A square or arcuate groove 36b corresponding to the outer peripheral surface of the stop member 24 is formed at the center. In the case of FIG. 4, since the cross-section of the stop member 24 is exemplified, the concave groove 36b is also a semicircular arc so that the fitting is possible. [? 】is there.
A cover member 36d is projected on the front end side, and an engagement member 36c is formed on the rear end side. A cut 36a is formed in part of the ring 36 in consideration of ease of mounting work. However, the cut 36a is dimensioned so that it fits in the mounted state as shown in FIGS. 4 (A) and 4 (B), and there is no risk of chips entering from there.
[0024]
Next, the assembly of the structure of the fastening portion 3 appearing in FIGS. 4A and 4B is performed by assembling the spacer 21, the rubber seal 20 and the stopper member 24 in the state shown in FIG. Thereafter, the annular ring 36 is inserted into the position shown in the state in which the outer periphery of the stop member 24 is slid with the cut 36a at the top by utilizing the elastic force of the ring 36. Due to the presence of the cut 36a, the mounting work becomes extremely easy.
When the tool 6 is attached to the fastening portion 3 having the above-described configuration and used for machining in a high-speed rotation state, the stop member 24 is expanded under the action of the centrifugal force accompanying the high-speed rotation in the high-speed rotation state. Diameter. However, since the ring 36 is disposed at the outer peripheral position of the stop member 24 as shown in FIGS. 4A and 4B, the diameter of the stop member 24 cannot be increased due to the presence of the ring 36. Escape from is prevented.
Note that the upper side of the stop member 24 having the cut 24a is covered with the main portion of the annular ring 36 and the cover member 36d, and it is possible to prevent chips from entering the inside through the cut 24a.
[0025]
Next, FIG. 5 which shows an example different from the structure concerning the ring for expansion prevention in the fastening part 3 of FIGS. 1-4 is demonstrated.
The expansion preventing ring 46 is formed in an annular shape from an elastic material such as a rubber material or a synthetic resin material, and is provided around the outer peripheral position of the spherical stop member 47. As shown in FIG. 5D, the inner side of the ring 46 comes into contact with the outer periphery 10a of the fastening cylinder 10 in many parts, and in part comes into contact with the spherical stop member 47, and the outer periphery is the rotating cylinder. The inner surface 12a is formed to have a thickness that approaches within a range in which a very small gap remains so as to be movable relative to the inner surface 12a. A portion facing the stop member 47 on the inner peripheral side of the ring 46 forms a recess 46a corresponding to the outer peripheral surface of the stop member 47 so that the fitting is possible. In the case of FIG. 5, the stop member 47 has a spherical cross section, so the recess 46a is also a semi-sphere. A cover member 46b projects from the front end side of the recess 46a, and an engagement member 46c is formed on the rear end side.
[0026]
Next, the recess 48 is provided in an equally divided state around the fastening cylinder 10 at an arbitrary plurality of locations, for example, 4 locations or 3 locations as shown in FIG. 5D or 5E. Each has a deep through-hole toward the inner side where the shaft core 5 is located. The inner diameter is a small diameter corresponding to the range in which the stop member 47 can be moved up and down. The spherical stop member 47 is housed in a state in which a part thereof is buried in each of the deep holes 48 provided at a plurality of positions.
Reference numeral 49 denotes a female screw hole provided from the front end of the fastening cylinder 10 toward the bottom side of the recess 48, and as shown in FIG. 47 is lowered so that it can protrude (or fall). Reference numeral 50 denotes a male threaded rod, which can be inserted into the female threaded hole 49 as shown in FIG. 5C by rotating it using an arbitrary tool such as a screwdriver. In a state where the male screw rod 50 is inserted into the female screw hole 49, the stop member 47 is pushed up in the radial direction,
As shown in the figure, the ring 46 is fitted into the recess 46a.
Further, if the head of the male threaded rod 50 is stopped near the lower side of the spherical stop member 47 shown in FIG. 5B, the outer peripheral surface of the stop member 47 is shown in the figure from the recess 46a of the ring 46. The ring 46 can be easily attached and detached. In the case of this operation, the inner peripheral surface of the stop member 47 is supported by the head of the male screw rod 50 and can be prevented from escaping into the female screw hole 49.
[0027]
Next, the assembly of the fastening part 3 appearing in FIGS. 5 (A) to 5 (D) is performed by assembling the spacer 21 and the rubber seal 20 in the state shown in FIG. A spherical stop member 47 is placed in each of the recesses 48 in a state as shown in FIG. Thereafter, the annular ring 46 is utilized in its elastic force so that the shaft core 5 of the ring 46 and the shaft core 5 of the fastening portion 3 coincide with each other, and the recess 46a of the ring 46 can correspond to the stop member 47. Insert into the illustrated position in a side-sliding state in the axial direction. In this state, when the male threaded rod 50 is screwed into the female threaded hole 49 with respect to each female threaded hole 49, each spherical stop member 47 moves in the radial direction by the dimension shown in the figure, and the recess 46a of the ring 46 is moved. To prevent the ring 46 and the rubber seal 20 from coming off.
[0028]
When the tool 6 is mounted on the fastening portion 3 having the above-described configuration and used for machining in a high-speed rotation state, the stop member 47 is radiated in response to the centrifugal force associated with the high-speed rotation in the high-speed rotation state. Try to move in the direction. However, since the ring 46 is arranged at the outer peripheral position of the stop member 47 as shown in FIGS. 5C, 5D and 5E, it cannot be moved greatly because of the presence of the ring 46. Escapes from the recess 48.
[0029]
In the description of FIGS. 3 to 6, parts that are considered to have the same or equivalent configuration in function, property, feature, or the like as those in FIGS. 1 and 2 are described with reference to FIG. The same reference numerals as those in FIG.
[0030]
【The invention's effect】
As described above, according to the present invention, even when the rotation speed of the main shaft is increased, the expansion preventing ring 27 is provided around the outer peripheral position of the stop member 24. Therefore, the stop member 24 is radiated in the radial direction by centrifugal force. Therefore, there is an effect that it does not move greatly, that is, it does not float significantly from the fitting recess 23.
Further, in the present invention, even if the stop member 24 is provided with a ring 27 for preventing expansion around it so that it does not float from the fitting recess 23 due to centrifugal force, the ring 27 is always a fastening cylinder. In the case where the tool 6 is integrated to the tool holding hole 7 and the original part of the tool 6 is extracted and remounted, fine chips adhere to the rotating cylinder 12 that is moved up and down (moved in the direction of the arrow 41). In this case, the ring 27 is always attached to the fastening cylinder 10 regardless of the up-and-down movement of the rotating cylinder 12 even when it is poured down toward the fastening cylinder 10. It is possible to protect the fine chips from passing around the stopper member 24 in this case, and this has the epoch-making effect of significantly reducing the degree of the chips entering toward the seal 20.
[Brief description of the drawings]
FIG. 1 is a sectional view of a tool.
2A is an enlarged cross-sectional view of the main part immediately before mounting the ring 27 in the tightening portion, FIG. 2B is an enlarged cross-sectional view of the main part in the process of mounting the ring 27, and FIG. 27 is an enlarged cross-sectional view of a main part in a state in which 27 is mounted, (D) is an enlarged cross-sectional view of a main part in a state where the tightening part is upward and the rotating cylinder is raised, and (E) is a stop member and a ring. Perspective view.
3A is a cross-sectional view of a main part showing an example different from the tightening part shown in FIG. 2, FIG. 3B is an enlarged cross-sectional view of the main part in the process of mounting the ring 32, and FIG. FIG. 4 is an enlarged cross-sectional view of a main part in a state where the ring 32 is mounted, and FIG. 4D is a perspective view showing the pressing ring 34, the ring 32, and the stop member 24.
4A is a cross-sectional view of an essential part showing an example different from the tightening portion shown in FIGS. 2 and 3, FIG. 4B is a cross-sectional view taken along line IV-IV, and FIG. The perspective view which shows the stop member 24. FIG.
5A is a cross-sectional view of a main part showing an example different from the tightening part shown in FIGS. 2, 3, and 4. FIG. 5B is an enlarged cross-sectional view of the main part in the process of mounting the ring 46. FIG. , (C) is an enlarged cross-sectional view of the main part with the ring 46 mounted,
(D) and (E) are VV sectional views showing different cases.
6A is an enlarged cross-sectional view of a main part of a conventional tool in a state in which a rotating cylinder to which chips are attached is raised for tool replacement, and FIG. 6B is a rotating cylinder of a tightening part. Fig. 3 is an enlarged cross-sectional view of the main part in a state where the swarf is lowered and chips fall into the fastening cylinder.
[Explanation of symbols]
1 ... Body,
3 ... Fastening part,
6 ... to-be-held object,
10 ... Fastening tube,
11 ... Gap,
12 ... rotating cylinder,
23 ... concave portion,
24 ... stopping member,
27 ... Ring for preventing expansion

Claims

A hollow cylinder that is elastically deformable in the radial direction, and is provided with a holding hole for a held object with an opening at the inside, and a fastening cylinder whose outer peripheral surface is a tapered surface;
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In a holder provided with a stopper member fitted in a recess provided around the fastening tube closer to the tip than the roller in the gap,
The holding member is characterized in that an inner ring is fitted and integrated with the stopper member at the outer peripheral position of the stopper member, and an expansion preventing ring is provided around the outer periphery so as to be movable relative to the inner surface of the rotating cylinder. Ingredients.

A hollow cylinder that is elastically deformable in the radial direction, and is provided with a holding hole for a held object with an opening at the inside, and a fastening cylinder whose outer peripheral surface is a tapered surface;
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In holder and an annular stop member that is fitted to the concave portion, which is circumferentially provided around the fastening sleeve at the distal nearer rollers in the gap,
At the outer peripheral position of the annular stop member, the inner side is fitted and integrated with the stop member, and the outer periphery is provided with a ring for preventing expansion of elastic material so that it can move relative to the inner surface of the rotating cylinder. A holding tool characterized by that.

The tip end side of the expansion preventing ring is provided with a covering member for preventing chip intrusion protruding toward the inner periphery so as to cover the tip end side of the annular stop member. Item 3. The holder according to Item 2.

A hollow cylinder that is elastically deformable in the radial direction, and is provided with a holding hole for a held object with an opening at the inside, and a fastening cylinder whose outer peripheral surface is a tapered surface;
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In holder and a stop member that is fitted to the concave portion, which is circumferentially provided around the fastening sleeve at the distal nearer rollers in the gap,
At the outer peripheral position of the stopper member, the inner side is in contact with the stopper member, and the outer periphery is provided with a ring for preventing expansion so as to be relatively movable with respect to the inner surface of the rotating cylinder. A positioning member that protrudes toward the inner periphery is provided with a material, and a pressing ring formed of an elastic material that can be expanded and contracted in cross section on the inner side is positioned in the expanded state. A holder characterized in that a member is fixed to a stop member so as to be pressed.

A hollow cylinder that is elastically deformable in the radial direction, and is provided with a holding hole for a held object with an opening at the inside, and a fastening cylinder whose outer peripheral surface is a tapered surface;
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In holder and a stop member that is fitted to the concave portion, which is circumferentially provided around the fastening sleeve at the distal nearer rollers in the gap,
At the outer peripheral position of the stop member, the inner side is in contact with the stop member, and the outer periphery is provided with an expansion preventing ring for elastic material formation so as to be relatively movable with respect to the inner surface of the rotating cylinder. On the tip side of the ring, an integral material is provided so as to cover the tip side of the annular stop member, and a cover member is provided that protrudes toward the inner periphery. A holding tool comprising an engaging member protruding toward an inner periphery.

A hollow cylinder that is elastically deformable in the radial direction, and is provided with a holding hole for a held object with an opening at the inside, and a fastening cylinder whose outer peripheral surface is a tapered surface;
A rotating cylinder disposed around the fastening cylinder so as to be relatively rotatable with a gap therebetween;
The rotating cylinder is moved relative to the fastening cylinder in the gap between the outer peripheral surface of the fastening cylinder and the inner peripheral surface of the rotating cylinder, thereby moving the rotating cylinder in the axial direction of the fastening cylinder and fastening. A number of rollers positioned to shrink the cylinder and fasten the object to be held by its inner peripheral surface;
In a holder provided with a stopper member fitted in a recess provided around the fastening tube closer to the tip than the roller in the gap,
The recesses are provided at a plurality of locations around the fastening cylinder, each of which is a deep hole in the axial direction, and the stop member is formed in a spherical shape with respect to the deep holes in the axial direction provided at the plurality of locations. And is prepared for infestation,
At the outer peripheral position of the spherical stop member, the inner side is in contact with the outer periphery of the fastening cylinder and is fitted to the spherical stop member to prevent lateral displacement, and the outer periphery is on the inner surface of the rotating cylinder. A holder for disposing an expansion preventing ring formed of an elastic material that is close to be relatively movable.