JP4381583B2

JP4381583B2 - Scale device holding device

Info

Publication number: JP4381583B2
Application number: JP2000285805A
Authority: JP
Inventors: 健尾上
Original assignee: ソニーマニュファクチュアリングシステムズ株式会社
Priority date: 2000-09-20
Filing date: 2000-09-20
Publication date: 2009-12-09
Anticipated expiration: 2020-09-20
Also published as: JP2002096228A

Description

【０００１】
【発明の属する技術分野】
本発明は、各種の工作機械、産業機械或いは精密機械等の本体機械に付設されて可動部の相対移動距離や移動位置等の位置情報を検出する位置検出装置、デジタルスケール装置或いはエンコーダ等のスケール装置を本体機械に対して位置決め保持するスケール装置の保持装置に関する。
【０００２】
【従来の技術】
各種の工作機械、産業機械或いは精密機械等の本体機械には、スケール装置が取り付けられてテーブル等の可動部の相対移動距離や移動位置等の位置情報が検出される。スケール装置は、一般に、目盛が設けられた長尺のスケール部材と、このスケール部材に対してスライド自在に組み付けられたスケールヘッドとを備えて構成されている。スケール装置は、スケールヘッドを可動部と連結させて本体機械に形成したスケール取付面に取り付けられ或いは可動部に設けられたスケール取付面に直接取り付けられる。スケール装置は、可動部の移動動作に伴ってスケールヘッドが定点から所定の位置へと移動することにより、このスケールヘッドの移動量に応じた位置情報を出力する。
【０００３】
【発明が解決しようとする課題】
従来のスケール装置は、一般に筐体やスケール部材が、鉄板の折曲げ加工や軽量化を目的としてアルミ材の押出し加工によって形成されている。スケール装置は、筐体やスケール部材をアルミ材によって形成した場合に、全体が長尺であることから充分な機械的剛性を確保することが困難となって本体機械に対して可動部の移動方向に対して高精度の平行度を保持し得ないといった問題があった。また、スケール装置は、本体機械のスケール取付面を高精度に形成し得ないこともあって、直接取り付けた場合にこのスケール取付面の仕上り形状にしたがってうねり曲りが生じてしまう。したがって、スケール装置は、可動部の移動位置を高精度に検出し得なくなるといった問題があった。
【０００４】
スケール装置は、上述した問題を解決するために、その取付面と本体機械或いは可動部等の本体機械側に形成されたスケール取付面との間に高精度に形成されたスペーサを介挿して取付を行う対応も図られている。しかしながら、かかるスペーサは、スケール装置のコストをアップさせるとともに構成各部材を高精度に位置決めした状態で取り付けが行われるために工数がかかるといった問題があった。また、スペーサ部材は、これ自体が押出し加工によって形成された部材であるとともにスケール装置を固定するように構成した場合に、スケール装置に対して本体機械側のスケール取付面の面精度の影響を受けないように作用するが、これ自体のうねり曲りの影響をスケール装置に及ぼしてしまうといった問題があった。
【０００５】
従来のスケール装置においては、上述したスペーサ部材に複数個の板ばねを取り付け、これら板ばねの弾性力によって本体機械に固定したスペーサ部材の側面に挟み込んで取り付ける対応も図られている。かかる取付構造は、スペーサ部材のうねり曲りを板ばねの弾性力が吸収することで、スケール装置が本体機械に対して精度よく取り付けられるようにする。しかしながら、かかる取付構造も、多数個の板ばねを必要とするとともにスペーサ部材に対するスケール装置の取付作業が面倒でかつ時間もかかるといった問題があった。さらに、取付構造は、板ばねの弾性力がスケール装置に対してスペーサ部材の取付面に圧接する方向に作用するが、長さ方向に対しての規制力として作用されていない。このため、スケール装置は、温度環境の変化により本体機械やスペーサ部材或いは自身の熱膨張により、正確な位置検出が行い得ないといった問題があった。
【０００６】
したがって、本発明は、スケール装置とともに機械的剛性が小さいが軽量で高寸法の加工が行われる軽量金属材によって形成され、本体機械に対してスケール装置を簡易にかつ精度よく取付を可能とするとともに温度変化による熱膨張の影響を低減して高精度の位置情報の検出を行い得るようにしたスケール装置の保持装置を提供することを目的に提案されたものである。
【０００７】
【課題を解決するための手段】
上述した目的を達成する本発明にかかるスケール装置の保持装置は、長尺の筐体を有し本体機械側の可動部の位置情報を検出するスケール装置を本体機械側に位置決め保持する。スケール装置の保持装置は、本体機械側のスケール取付面に取り付けられる取付部材と、スケール装置を保持する保持部材と、これら取付部材と保持部材とを一体化する弾性連結部材とから構成される。保持部材は、長尺な部材からなり、本体機械側のスケール取付面に固定される位置決め取付面と、スケール装置の筐体に形成された取付基準面が当接される第１の基準面とが設けられ、取付手段を介してスケール取付面に取り付けられるとともにスケール装置の取付基準面及びこの取付基準面と直交する第１の側面とを保持する。保持部材も、長尺な部材からなり、スケール装置の筐体に形成された取付基準面が当接されことによって本体機械側のスケール取付面に対するスケール装置の取付位置を規定する第２の基準面と、この第２の基準面に直交して形成されスケール装置の取付基準面と直交する第２の側面を保持する保持手段とが形成されてなる。弾性連結部材は、取付部材と保持部材とを連結するとともに、これらを互いに引き合う方向に付勢する。
【０００８】
以上のように構成された本発明にかかるスケール装置の保持装置によれば、取付部材と保持部材とを弾性連結部材の弾性力に抗して互いに開いた状態として、この状態においてスケール装置がその筐体を取付部材と保持部材との間に押し込まれて組み付けられるようにする。スケール装置の保持装置によれば、弾性連結部材の弾性力によってスケール装置を取付部材と保持部材とに長さ方向の全域に亘って挟み込んで保持する。スケール装置の保持装置は、取付部材がその位置決め取付面を本体機械側のスケール取付面に固定されて取り付けられることによって、この取付部材と保持部材とによって保持したスケール装置を本体機械側に位置決めした状態で付設する。したがって、スケール装置の保持装置は、本体機械側のスケール取付面の面精度にかかわらず極めて簡易な取付作業によりスケール装置を本体機械側に高精度に取り付けることを可能とし、スケール装置による可動部の位置検出が高精度に行われるようにする。スケール装置の保持装置は、取付部材をスケール取付面に取り付けるとともに弾性部材を介して連結された保持部材とともにスケール装置を保持することで温度変化による本体機械とスケール装置との熱膨張の差異が緩和されるようにして、スケール装置による可動部の位置検出が高精度に行われるようにする。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態について、図面を参照して詳細に説明する。実施の形態として図面に示した保持装置１は、本体機械２に付設されてその可動部３と連結されたスケールヘッド５を備えるスケール装置４を、本体機械２に対して高精度にかつ簡易な方法によって取り付ける。本体機械２は、各種の工作機械や産業機械或いは精密機械からなり、詳細を省略するが加工テーブルやバイト台等の精密な直線移動を行う可動部３が備えられる。本体機械２は、可動部３の原点位置からの移動量や現在位置の情報がスケール装置４によって検出され、この検出情報がフィードバックされて可動部３の移動動作が制御される。なお、本体機械２は、可動部３にスケール取付部が形成されており、この可動部３側に保持装置１を介してスケール装置４を取り付けるようにも構成される。
【００１０】
本体機械２には、図１に示すように、可動部３の移動領域に沿った全域に亘って、スケール装置４が付設される平坦なスケール取付面６が形成されている。スケール取付面６は、比較的精度の高い面精度を以って形成されているが、加工精度等により多少のうねり曲りを有している。スケール取付面６には、可動部３の移動方向に沿って複数個の取付孔７が形成されており、詳細を後述するようにこれら取付孔７にねじ込まれる取付ねじ８によって保持装置１が取り付けられる。
【００１１】
スケール装置４は、詳細を省略するが筐体９の内部に図示しないスケールが収納されており、このスケールに対して連結片１３を介してスケールヘッド５がスライド自在に組み合わされてなる。筐体９は、本体機械２のフレーム材よりも剛性の小さな例えばアルミ材の押出し加工によって形成され、本体機械２の可動部３の移動領域の全域に亘って延在するに足る長尺な箱状を呈している。筐体９には、図１に示すように、本体機械２のスケール取付面６と対向する主面が高精度の平坦面とされた取付基準面１０として構成されてなる。なお、スケール装置４は、上述した構成に限定されるものではなく、種々の装置が用いられる。
【００１２】
筐体９には、図４及び図５に示すように取付基準面１０に直交する長さ方向の第１の側面（上面）９ａに嵌合凹部１１が全域に亘って形成されている。筐体９には、この嵌合凹部１１によって第１の側面９ａの両側縁に沿って長さ方向の全域に亘って互いに平行な凸部が形成されてなる。筐体９には、第１の側面９ａと対向する取付基準面１０と直交する長さ方向の第２の側面（底面）９ｂに嵌合凹部１２が形成されている。嵌合凹部１２は、第２の側面９ｂの両側縁に沿って形成されており、内側に向かって次第にその深さが大ならしめられた断面楔状の凹部からなる。
【００１３】
なお、筐体９は、第１の側面９ａに嵌合凹部１１によって構成される一対の凸部が形成されるとともに第２の側面９ｂに一対の嵌合凹部１２を形成することによって、反転した状態で後述する保持装置１への取付を可能とした構成となっている。筐体９は、取付基準面１０と対向する主面も高精度の平坦面とされた取付基準面として構成されてなる。勿論、筐体９は、保持装置１に対する取付方向が規定されている場合には、一方側にのみ取付基準面１０や凸部或いは嵌合凹部１２を形成すればよい。
【００１４】
スケールヘッド５には、詳細を省略するが検出部や出力部が内蔵されており、出力部を介して検出情報を本体機械へと出力する。スケールヘッド５には、図４及び図５に示すように、スケールの目盛を指し示す指針１４が設けられている。なお、スケール装置４は、スケールヘッド５を本体機械２の可動部３に連結したが、例えばスライダを内蔵し、このスライダを可動部３に連結するようにしてもよい。
【００１５】
スケール装置４は、本体機械２の可動部３が移動動作されると、この可動部３に連動してスケールヘッド５も原点位置から移動動作する。スケール装置４は、スケールヘッド５によって可動部３の移動量或いは移動位置を検出して、検出情報を出力部を介して本体機械２へと出力する。スケール装置４は、保持装置１を介して本体機械２に取り付けられることにより、上述した本体機械２のスケール取付面６のうねり曲りの影響を直接受けることなくその取付が行われる。
【００１６】
保持装置１は、図１及び図２（ａ）、図３に示すように本体機械２に取り付けられるとともにスケール装置４を保持する取付部材１５と、スケール装置４を保持する保持部材１６と、これら取付部材１５と保持部材１６とを一体化する連結板ばね部材１７とから構成される。取付部材１５は、上述したように本体機械２の可動部３の移動領域の全域に亘る長さを有するスケール装置４をその長さ方向の全域に亘って保持するに足る長尺な略角棒状の部材からなる。
【００１７】
取付部材１５は、例えばアルミ材やアルミ合金材等の機械的剛性はやや小さいが軽量で長尺部材であっても高精度の加工が可能な軽量金属材を基材として、押出し加工によって形成されてなる。なお、取付部材１５は、鉄材等によって形成するようにしてもよいが、全体の重量が大きくなって取り扱いが面倒となるとともに長尺部材を高精度に加工することが困難であることから、上述したアルミ材やアルミ合金材等の軽量金属材料を用いることが好ましい。
【００１８】
取付部材１５は、一方の側面が高精度の平坦面として形成されることによって本体機械２のスケール取付面６に長さ方向の全域に亘って接合される位置決め取付面１８として構成されてなる。取付部材１５には、位置決め取付面１８と直交する底面に全長に亘って断面形状が矩形の凸部１９が一体に形成されている。取付部材１５は、この凸部１９の位置決め取付面１８側の側面が、後述するように連結板ばね部材１７の取付面２０として構成される。取付部材１５は、凸部１９の位置決め取付面１８と対向する側面が、高精度の平坦面として形成されてスケール装置４を本体機械２に対して位置決めする第１の基準面２１として構成されてなる。
【００１９】
取付部材１５には、位置決め取付面１８とその対向面とに貫通する複数個の取付孔２２が形成されている。取付部材１５には、凸部１９が形成された底面に、ストッパ凸部１５ａが一体に形成されている。ストッパ凸部１５ａは、凸部１９の第１の基準面２１との間に長さ方向の全域に亘って浅い凹部を形成するようにして一体に突設されてなる。ストッパ凸部１５ａは、後述するようにスケール装置４が取り付けられた状態において、筐体９の第１の側面９ａに形成した嵌合凹部１１と相対嵌合してこの筐体９の上部を係止する。
【００２０】
以上のように構成された取付部材１５は、位置決め取付面１８をスケール取付面６に当てがうとともに各取付孔２２を相対する取付孔７にそれぞれ対応位置させて、本体機械２に組み付けられる。取付部材１５は、図３に示すように取付孔２２に取付ねじ８を挿入して取付孔７にねじ込むことによって本体機械２に取付固定される。取付部材１５は、上述したように機械本体２のスケール取付面６が多少のうねり曲りを有しており、このスケール取付面６に対して位置決め取付面１８が密着して取り付けられるわけではないが、比較的精度を有して形成されていることから互いの平行度が保持される。取付部材１５は、例えば０．１ｍｍ／ｍ程度の精度を以って本体機械２のスケール取付面６に取付固定される。
【００２１】
保持部材１６も、本体機械２の可動部３の移動領域の全域に亘る長さ、換言すれば取付部材１５とほぼ等しい長さを有する長尺な略角棒状に形成された部材からなる。保持部材１６も、例えばアルミ材やアルミ合金材等の軽量金属材を基材として押出し加工によって形成されてなる。保持部材１６も、鉄材等によって形成するようにしてもよいが、全体の重量が大きくなって取り扱いが面倒となるとともに長尺部材を高精度に加工することが困難であることから、上述したアルミ材やアルミ合金材等の比較的軽量な金属材料を用いることが好ましい。
【００２２】
保持部材１６は、後述するように連結板ばね部材１７によって取付部材１５側に引き寄せられて組み合わされる。したがって、保持部材１６には、その上面と取付部材１５の底面とが長さ方向の全域に亘って接合する構造とならないように図２（ａ）に示すように上面の両端部に対向間隔を保持する凸部１６ａ、１６ｂが形成されている。保持部材１６には、本体機械２側の側面に長さ方向の全域に亘って上面に開放された段部が形成されており、この段部の側面が上述した取付部材１５の板ばね取付面２０に対応する板ばね取付面２３を構成してなる。
【００２３】
保持部材１６は、板ばね取付面２３と対向する側面がスケール装置４を本体機械２に対して位置決めする第２の基準面２４として構成されてなる。第２の基準面２４は、高精度の平坦面として形成されており、筐体９の取付基準面１０が接合されることによりスケール装置４を本体機械２のスケール取付面６に対して位置決めする。第２の基準面２４は、取付部材１５と組み合わされた状態において、本体機械２のスケール取付面６と略平行で第１の基準面２１と略同一面を構成する。
【００２４】
保持部材１６には、第２の基準面２４の下端縁に沿って長さ方向の全域に亘って係合凸縁部２５が突設されている。係合凸縁部２５は、スケール装置４の筐体９の第２の側面（底面）９ｂに形成した嵌合凹部１２に対応した断面形状が楔形を呈して形成されている。係合凸縁部２５は、取付部材１５と保持部材１６とを組み合わせた状態において、取付部材１５の底面との間隔がスケール装置４の筐体９の高さ寸法、すなわち第１の側面９ａ、９ｂの間隔とほぼ等しい。
【００２５】
以上のように構成された保持部材１６は、係合凸縁部２５が筐体９の嵌合凹部１２と嵌合することによって、スケール装置４を長さ方向の全域に亘って保持する。保持部材１６は、後述する連結板ばね部材１７の弾性力によって、取付部材１５との間でスケール装置４を挟持する。保持部材１６は、相対嵌合する係合凸縁部２５と嵌合凹部１２とが楔形の形状を呈することで、その第２の基準面２４と取付部材１５の第１の基準面２１とに対してスケール装置４の筐体９を引き寄せるようにする。
【００２６】
連結板ばね部材１７は、図２に示すように、取付部材１５及び保持部材１６とほぼ等しい長さを有している。連結板ばね部材１７は、幅方向の略中央部を頂点として山折りされてなり、両側縁部位がそれぞれ固定端部２６、２７とされるとともに頂点部位が弾性変位部２８として構成されてなる。連結板ばね部材１７には、固定端部２６、２７にそれぞれ多数個の取付孔２６ａ、２７ａが形成されている。
【００２７】
以上のように構成された連結板ばね部材１７は、図１に示すように一方の固定端部２６が取付部材１５の凸部１９の側面に形成したばね取付面２０に図示しない取付ねじによって固定される。連結板ばね部材１７は、他方の固定端部２７が保持部材１６に形成したばね取付面２３に図示しない取付ねじによって固定される。連結板ばね部材１７は、弾性変位部２８が取付部材１５と保持部材１６との対向空間部に長さ方向の全域亘って延在するようにして取り付けられる。連結板ばね部材１７は、図１及び図２（ｂ）に示すように、本体機械２に取り付けられた取付部材１５に対して長さ方向の全域に亘って保持部材１６が懸架状態で組み合わされるようにする。連結板ばね部材１７は、取付部材１５と保持部材１６とを引き寄せるようにして弾性力を作用させる。
【００２８】
なお、連結板ばね部材１７は、取付部材１５及び保持部材１６とほぼ等しい長さを有する長尺の一体の部材が用いられているが、複数個に分割された板ばね部材であってもよい。かかる板ばね部材は、取付部材１５と保持部材１６とに対してほぼ等間隔で固定されることにより、長さ方向に対して等しい弾性力が生成されるようにすることが好ましい。
【００２９】
保持装置１は、上述した構成部材１５〜１７を組み立てた状態で、本体機械２のスケール取付面６に対して取付部材１５が可動部３の移動領域の全域に亘って延在するようにして取り付けられる。保持装置１は、図３及び図２（ｂ）に示すように取付部材１５の第１の基準面２１と保持部材１６の第２の基準面２４とが露呈されてこれら基準面２１、２４と取付部材１５の底面及び保持部材１６の係合凸縁部２５とに囲まれたスケール装置４の組付空間部Ｈを構成する。保持装置１は、本体機械２に直接取り付けられる取付部材１５と、後述するようにスケール装置４を位置決め保持する保持部材１６とが長さ方向の全域に亘って連結板ばね部材１７を介して連結されている。
【００３０】
したがって、保持装置１は、本体機械２のスケール取付面６に多少のうねり曲りがあってもその影響が連結板ばね部材１７によって吸収され、保持部材１６に形成した第２の基準面２４が正確に位置出しされる。なお、保持装置１は、後述するようにスケール装置４を組み付けた状態で、取付部材１５を本体機械２に取り付けるようにしてもよいことは勿論である。
【００３１】
保持装置１には、図４に示すように組付空間部Ｈに対してスケール装置４が押込み操作されて組み付けられる。保持装置１には、図５及び図６に示すように、スケール装置４が、その筐体９の嵌合凹部１２を保持部材１６の係合凸縁部２５上に嵌合された状態で保持部材１６を下方へと押し下げながら組付空間部Ｈ内に押し込まれる。保持装置１は、図６に示すように保持部材１６が連結板ばね部材１７の弾性力に抗して本体機械２側へと変位して組付空間部Ｈの高さを大きくすることで、スケール装置４の筐体９の上部が取付部材１５のストッパ凸部１５ａを通過し得るようにする。
【００３２】
保持装置１は、スケール装置４が、筐体９の上部がストッパ凸部１５ａを通過するとともに取付基準面１０が取付部材１５の第１の基準面２１に衝合した状態において押込み操作が止められると、連結板ばね部材１７が初期状態へと弾性復帰する。保持装置１は、連結板ばね部材１７の弾性力によって、図７に示すようにスケール装置４の筐体９を取付部材１５の底面と保持部材１６の係合凸縁部２５との間で挟持する。保持装置１は、連結板ばね部材１７の弾性力が、上述した嵌合凹部１２と係合凸縁部２５の形状によりスケール装置４を本体機械２側へと引き寄せる方向に作用することで、筐体９の取付基準面１０を第１の基準面２１及び第２の基準面２４に押し付けてこのスケール装置４を位置決めした状態で保持する。
【００３３】
保持装置１は、上述したようにスケール装置４がワンタッチ操作で装着されるとともに、このスケール装置４を本体機械２に付設する。保持装置１は、保持部材１６の第２の基準面２４によってスケール装置４を本体機械２に対してその可動部３の移動領域の全域に亘って位置決め保持する。保持装置１は、それ自体の構成部材やスケール装置４の筐体９をアルミ材等の機械的剛性がやや小さい金属材によって形成した場合においても、本体機械２に対してスケール装置４を高精度に位置決めして付設する。保持装置１は、スケール装置４とともに構成部材がアルミ材等の軽量金属材で形成されることによって軽量化が図られ、長尺であっても高精度に形成されるとともに取り扱いが簡便である。
【００３４】
保持装置１は、上述したように連結板ばね部材１７の弾性力によってスケール装置４を取付部材１５と保持部材１６との間で挟持するが、本体機械２から大きな振動等が加えられた場合に、長さ方向に対して移動する虞がある。保持装置１においては、図８に示すように取付部材１５に上下方向に貫通する取付孔２９が形成され、この取付孔２９に取付ねじ３０をねじこむことによってスケール装置４の筐体９を固定するようにしてもよい。勿論、筐体９には、図示しないが取付部材１５の取付孔２９に対応して取付孔が形成されている。
【００３５】
保持装置１は、上述したように本体機械２に対してスケール装置４が直接固定されない構成とされており、本体機械２に直接固定される取付部材１５に対してスケール装置４を強固に固定した場合には従来と同様の問題が生じる。保持装置１は、スケール装置４が、長さ方向の略中央部の１ヶ所で取付部材１５に対して取付ねじ３０によって固定されるようにする。なお、保持装置１は、取付部材１５に対してスケール装置４を長さ方向に固定すればよく、例えば取付部材１５と筐体９との対向面に相対係合する係合凸部と係合凹部とからなる係止手段を形成して同様の作用を奏するようにしてもよい。
【００３６】
保持装置１は、スケール装置４とともに長尺であることから、上述したように長さ方向の略中央部で固定することによりスケール装置４をバランスよくかつ安定した状態で固定する。スケール装置４は、取付部材１５と保持部材１６とを分離して連結板ばね部材１７によって連結した保持装置１により温度変化に伴う熱膨張による計測誤差の低減が図られており、略中央部を基準として温度変化に伴って伸び縮みが生じる。また、スケール装置４は、一般に原点となる基準点が中央部に設けられている。したがって、保持装置１は、スケール装置４を略中央部の原点の近傍において取付部材１５に固定することによって位置ズレを小さくして高精度の計測が行われるようにする。
【００３７】
【発明の効果】
以上詳細に説明したように、本発明にかかるスケール装置の保持装置よれば、本体機械側に取り付けられる取付部材と、スケール装置を保持する保持部材とを弾性連結部材によって組み合わせ、取付部材と保持部材とによりスケール装置を挟持して本体機械に対して付設するように構成したことから、機械的剛性が比較的小さい材質で形成されたり高精度に形成されたスケール装置に対して本体機械側のスケール取付面の面精度や取付状態或いは温度変化による熱膨張の差異等の影響を直接及ぼさないようにしてスケール装置による高精度の計測が行われるようにする。保持装置よれば、スケール装置を取付部材と保持部材との間に構成された組付空間部内に押し込み操作するといった極めて簡易な操作によって取付を可能とすることで、操作性の向上が図られる。保持装置は、スケール装置とともに取付部材と保持部材とをアルミ材等の軽量金属材によって長尺であっても高精度にかつ軽量化を図って形成することが可能とされ、取り扱いも簡便となる。
【図面の簡単な説明】
【図１】本発明にかかるスケール装置の保持装置の使用状態を説明する要部縦断面図である。
【図２】同保持装置であり、同図（ａ）は分解斜視図、同図（ｂ）は組立状態の斜視図である。
【図３】同保持装置の本体機械への取り付け操作を説明する要部縦断面図である。
【図４】同保持装置へのスケール装置の組立操作を説明する要部分解斜視図である。
【図５】同保持装置にスケール装置を組み立てた状態の要部斜視図である。
【図６】同保持装置へのスケール装置の組立操作を説明する要部縦断面図である。
【図７】同保持装置にスケール装置を組み立てた状態の要部縦断面図である。
【図８】同保持装置とスケール装置との固定操作を説明する要部斜視図である。
【符号の説明】
１保持装置、２本体機械、３可動部、４スケール装置、５スケールヘッド、６スケール取付面、９筐体、１０取付基準面、１１，１２嵌合凹部、１５取付部材、１６保持部材、１７連結板ばね部材、１８位置決め取付面、１９凸部、２１第１の基準面、２４第２の基準面、２５係合凸縁部、２８弾性変位部、２９取付孔、３０取付ねじ[0001]
BACKGROUND OF THE INVENTION
The present invention is a position detector, a digital scale device, or an encoder scale that is attached to a main machine such as various machine tools, industrial machines, or precision machines and detects position information such as a relative movement distance and a movement position of a movable part. The present invention relates to a holding device of a scale device that positions and holds the device with respect to a main machine.
[0002]
[Prior art]
A scale device is attached to a main machine such as various machine tools, industrial machines, or precision machines, and position information such as a relative movement distance and a movement position of a movable part such as a table is detected. Generally, the scale device includes a long scale member provided with a scale and a scale head that is slidably assembled to the scale member. The scale device is attached to a scale attachment surface formed on the main body machine by connecting the scale head to the movable portion or directly attached to the scale attachment surface provided on the movable portion. The scale device outputs position information corresponding to the amount of movement of the scale head as the scale head moves from a fixed point to a predetermined position in accordance with the movement of the movable part.
[0003]
[Problems to be solved by the invention]
In a conventional scale device, a housing and a scale member are generally formed by extruding an aluminum material for the purpose of bending a steel plate or reducing the weight. When the scale device is made of an aluminum material, the scale device has a long length, making it difficult to ensure sufficient mechanical rigidity. However, there is a problem that it is impossible to maintain a high degree of parallelism. In addition, the scale device may not be able to form the scale mounting surface of the main body machine with high accuracy, and thus when the scale device is directly mounted, undulation will occur according to the finished shape of the scale mounting surface. Therefore, the scale device has a problem that the moving position of the movable part cannot be detected with high accuracy.
[0004]
In order to solve the above-mentioned problem, the scale device is mounted by inserting a spacer formed with high accuracy between the mounting surface and the scale mounting surface formed on the main body machine side such as the main body machine or movable part. The correspondence which performs is also planned. However, such a spacer raises the cost of the scale device and has a problem that it takes a lot of man-hours because it is mounted in a state where the constituent members are positioned with high accuracy. In addition, the spacer member itself is a member formed by extrusion, and when configured to fix the scale device, the spacer member is affected by the surface accuracy of the scale mounting surface on the main body machine side with respect to the scale device. There is a problem that the scale device is affected by the undulation of itself.
[0005]
In the conventional scale device, a plurality of leaf springs are attached to the spacer member described above, and the attachment is performed by sandwiching the spacer members on the side surface of the spacer member fixed to the main body machine by the elastic force of these leaf springs. Such an attachment structure allows the scale device to be attached to the main body machine with high accuracy by the elastic force of the leaf spring absorbing the undulation of the spacer member. However, this mounting structure also has a problem that a large number of leaf springs are required and the mounting operation of the scale device to the spacer member is troublesome and takes time. Furthermore, although the attachment structure acts in the direction in which the elastic force of the leaf spring is pressed against the attachment surface of the spacer member with respect to the scale device, it does not act as a regulating force in the length direction. For this reason, the scale device has a problem that accurate position detection cannot be performed due to a thermal expansion of the main body machine, the spacer member, or itself due to a change in temperature environment.
[0006]
Therefore, the present invention is formed of a lightweight metal material that has low mechanical rigidity but is lightweight and is processed with a scale device together with the scale device, and enables the scale device to be easily and accurately attached to the main body machine. The present invention has been proposed for the purpose of providing a holding device for a scale device that can detect position information with high accuracy by reducing the influence of thermal expansion due to temperature change.
[0007]
[Means for Solving the Problems]
A holding device for a scale device according to the present invention that achieves the above-described object positions and holds a scale device that has a long casing and detects position information of a movable part on the main machine side on the main machine side. The holding device of the scale device includes an attachment member that is attached to the scale attachment surface on the main body machine side, a holding member that holds the scale device, and an elastic connecting member that integrates the attachment member and the holding member. The holding member is a long member, and includes a positioning mounting surface fixed to the scale mounting surface on the main body machine side, and a first reference surface with which a mounting reference surface formed on the housing of the scale device comes into contact. And is attached to the scale attachment surface via the attachment means and holds the attachment reference surface of the scale device and the first side surface orthogonal to the attachment reference surface. The holding member is also a long member, and a second reference surface that defines the mounting position of the scale device with respect to the scale mounting surface on the main machine side when the mounting reference surface formed on the casing of the scale device is in contact with the holding member. And a holding means for holding a second side surface that is formed orthogonal to the second reference surface and orthogonal to the mounting reference surface of the scale device. The elastic connecting member connects the attachment member and the holding member, and biases them in a direction in which they are attracted to each other.
[0008]
According to the holding device of the scale device according to the present invention configured as described above, the attachment member and the holding member are opened to each other against the elastic force of the elastic connecting member. The housing is pushed between the mounting member and the holding member so as to be assembled. According to the holding device of the scale device, the scale device is sandwiched and held between the mounting member and the holding member by the elastic force of the elastic connecting member over the entire length direction. The holding device of the scale device positions the scale device held by the mounting member and the holding member on the main body machine side by mounting the mounting member with its positioning mounting surface fixed to the scale mounting surface on the main body machine side. Attached in state. Therefore, the holding device of the scale device enables the scale device to be attached to the main body machine side with high accuracy by an extremely simple mounting operation regardless of the surface accuracy of the scale mounting surface on the main body machine side. Position detection is performed with high accuracy. The holding device of the scale device attaches the mounting member to the scale mounting surface and holds the scale device together with the holding member connected via the elastic member, thereby reducing the difference in thermal expansion between the main machine and the scale device due to temperature change. Thus, the position detection of the movable part by the scale device is performed with high accuracy.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A holding device 1 shown in the drawings as an embodiment is a highly accurate and simple scale device 4 including a scale head 5 attached to a main body machine 2 and connected to a movable portion 3 of the main body machine 2. Install by method. The main body machine 2 is composed of various machine tools, industrial machines, or precision machines, and is provided with a movable part 3 that performs precise linear movement such as a machining table or a bite table, although details are omitted. In the main body machine 2, the moving amount of the movable part 3 from the origin position and information on the current position are detected by the scale device 4, and the detected information is fed back to control the moving operation of the movable part 3. In addition, the main body machine 2 is configured such that a scale attaching portion is formed on the movable portion 3 and the scale device 4 is attached to the movable portion 3 side via the holding device 1.
[0010]
As shown in FIG. 1, the main machine 2 has a flat scale mounting surface 6 to which the scale device 4 is attached over the entire area along the moving region of the movable portion 3. The scale mounting surface 6 is formed with relatively high surface accuracy, but has some undulation due to processing accuracy and the like. A plurality of mounting holes 7 are formed in the scale mounting surface 6 along the moving direction of the movable portion 3, and the holding device 1 is mounted by mounting screws 8 screwed into the mounting holes 7 as will be described in detail later. It is done.
[0011]
The scale device 4 has a scale (not shown) housed inside the housing 9 although the details are omitted, and the scale head 5 is slidably combined with the scale via a connecting piece 13. The casing 9 is formed by an extrusion process of, for example, an aluminum material that is less rigid than the frame material of the main body machine 2, and is a long box enough to extend over the entire moving region of the movable portion 3 of the main body machine 2. It has a shape. As shown in FIG. 1, the housing 9 is configured as a mounting reference surface 10 whose main surface facing the scale mounting surface 6 of the main machine 2 is a high-precision flat surface. The scale device 4 is not limited to the above-described configuration, and various devices are used.
[0012]
As shown in FIGS. 4 and 5, the housing 9 has a fitting recess 11 formed on the entire first side surface (upper surface) 9 a in the length direction perpendicular to the attachment reference surface 10. The housing 9 is formed with protrusions parallel to each other over the entire area in the length direction along both side edges of the first side surface 9 a by the fitting recess 11. The housing 9 is formed with a fitting recess 12 on a second side surface (bottom surface) 9b in the length direction orthogonal to the mounting reference surface 10 facing the first side surface 9a. The fitting concave portion 12 is formed along both side edges of the second side surface 9b, and is formed of a concave wedge-shaped concave portion whose depth is gradually increased inward.
[0013]
Note that the housing 9 is inverted by forming a pair of projections formed by the fitting recesses 11 on the first side surface 9a and forming a pair of fitting recesses 12 on the second side surface 9b. In this state, it can be attached to the holding device 1 described later. The housing 9 is configured as an attachment reference surface whose main surface facing the attachment reference surface 10 is also a high-precision flat surface. Of course, when the mounting direction with respect to the holding device 1 is defined, the housing 9 may be formed with the mounting reference surface 10, the convex portion, or the fitting concave portion 12 only on one side.
[0014]
Although not described in detail, the scale head 5 includes a detection unit and an output unit, and outputs detection information to the main body machine via the output unit. As shown in FIGS. 4 and 5, the scale head 5 is provided with a pointer 14 indicating the scale of the scale. In the scale device 4, the scale head 5 is connected to the movable part 3 of the main machine 2. However, for example, a slider may be incorporated and the slider may be connected to the movable part 3.
[0015]
In the scale device 4, when the movable part 3 of the main machine 2 is moved, the scale head 5 is also moved from the origin position in conjunction with the movable part 3. The scale device 4 detects the moving amount or moving position of the movable unit 3 with the scale head 5 and outputs the detection information to the main machine 2 via the output unit. The scale device 4 is attached to the main body machine 2 via the holding device 1 so that the scale device 4 is attached without being directly affected by the undulation of the scale attachment surface 6 of the main body machine 2 described above.
[0016]
As shown in FIGS. 1, 2 (a), and 3, the holding device 1 is attached to the main machine 2 and holds the scale device 4, the holding member 16 that holds the scale device 4, and these It is comprised from the connection leaf | plate spring member 17 which unifies the attachment member 15 and the holding member 16. As shown in FIG. As described above, the attachment member 15 has a substantially rectangular bar shape that is long enough to hold the scale device 4 having a length over the entire moving region of the movable portion 3 of the main body machine 2 over the entire region in the length direction. It consists of the member.
[0017]
The attachment member 15 is formed by extrusion processing using a lightweight metal material, which is slightly small in mechanical rigidity, such as an aluminum material or an aluminum alloy material, but is lightweight and capable of high-precision processing even if it is a long member. It becomes. The attachment member 15 may be formed of iron or the like. However, since the entire weight becomes large and the handling becomes troublesome and it is difficult to process the long member with high accuracy, the above-described attachment member 15 is used. It is preferable to use a lightweight metal material such as an aluminum material or an aluminum alloy material.
[0018]
The mounting member 15 is configured as a positioning mounting surface 18 that is joined to the scale mounting surface 6 of the main machine 2 over the entire length direction by forming one side surface as a highly accurate flat surface. The mounting member 15 is integrally formed with a convex portion 19 having a rectangular cross-sectional shape over the entire length on a bottom surface orthogonal to the positioning mounting surface 18. In the mounting member 15, the side surface of the convex portion 19 on the positioning mounting surface 18 side is configured as a mounting surface 20 of the connecting leaf spring member 17 as described later. The mounting member 15 is configured as a first reference surface 21 for positioning the scale device 4 with respect to the main body machine 2 by forming the side surface of the convex portion 19 facing the positioning mounting surface 18 as a high-precision flat surface. Become.
[0019]
A plurality of mounting holes 22 are formed in the mounting member 15 so as to penetrate the positioning mounting surface 18 and its opposing surface. A stopper convex portion 15 a is integrally formed on the bottom surface of the mounting member 15 where the convex portion 19 is formed. The stopper convex portion 15 a is integrally projected so as to form a shallow concave portion over the entire length direction between the convex portion 19 and the first reference surface 21. The stopper projection 15a engages with the fitting recess 11 formed on the first side surface 9a of the housing 9 to engage the upper portion of the housing 9 in a state where the scale device 4 is attached as will be described later. Stop.
[0020]
The mounting member 15 configured as described above is assembled to the main body machine 2 with the positioning mounting surface 18 applied to the scale mounting surface 6 and the mounting holes 22 corresponding to the mounting holes 7 facing each other. As shown in FIG. 3, the attachment member 15 is attached and fixed to the main body machine 2 by inserting the attachment screw 8 into the attachment hole 22 and screwing it into the attachment hole 7. As described above, the scale mounting surface 6 of the machine body 2 has a slight undulation, and the positioning mounting surface 18 is not attached to the mounting member 15 in close contact with the scale mounting surface 6. Since they are formed with relatively high accuracy, the parallelism of each other is maintained. The attachment member 15 is attached and fixed to the scale attachment surface 6 of the main machine 2 with an accuracy of, for example, about 0.1 mm / m.
[0021]
The holding member 16 is also made of a member formed in a long, substantially rectangular bar shape having a length over the entire moving region of the movable portion 3 of the main machine 2, in other words, a length substantially equal to the mounting member 15. The holding member 16 is also formed by extrusion processing using a lightweight metal material such as an aluminum material or an aluminum alloy material as a base material. The holding member 16 may also be formed of iron or the like. However, since the overall weight becomes large and handling becomes troublesome and it is difficult to process the long member with high accuracy, the above-described aluminum is used. It is preferable to use a relatively lightweight metal material such as a metal material or an aluminum alloy material.
[0022]
As will be described later, the holding member 16 is combined by being pulled toward the mounting member 15 by the connecting leaf spring member 17. Therefore, the holding member 16 is provided with a facing interval at both ends of the upper surface as shown in FIG. 2A so that the upper surface of the holding member 16 and the bottom surface of the mounting member 15 are not joined over the entire length direction. Protrusions 16a and 16b to be held are formed. In the holding member 16, a stepped portion is formed on the side surface of the main body machine 2 on the upper surface over the entire length direction, and the side surface of this stepped portion is the leaf spring mounting surface of the mounting member 15 described above. The leaf spring mounting surface 23 corresponding to 20 is configured.
[0023]
The holding member 16 has a side surface facing the leaf spring mounting surface 23 configured as a second reference surface 24 for positioning the scale device 4 with respect to the main body machine 2. The second reference surface 24 is formed as a high-precision flat surface, and the scale device 4 is positioned with respect to the scale attachment surface 6 of the main machine 2 by joining the attachment reference surface 10 of the housing 9. . The second reference surface 24 is substantially parallel to the scale mounting surface 6 of the main body machine 2 and substantially the same surface as the first reference surface 21 when combined with the mounting member 15.
[0024]
On the holding member 16, an engaging convex edge portion 25 is provided so as to project over the entire region in the length direction along the lower end edge of the second reference surface 24. The engagement convex edge 25 is formed so that the cross-sectional shape corresponding to the fitting recess 12 formed in the second side surface (bottom surface) 9 b of the housing 9 of the scale device 4 has a wedge shape. In the state in which the engagement convex edge portion 25 is a combination of the attachment member 15 and the holding member 16, the distance from the bottom surface of the attachment member 15 is the height dimension of the housing 9 of the scale device 4, that is, the first side surface 9 a. It is almost equal to the interval 9b.
[0025]
The holding member 16 configured as described above holds the scale device 4 over the entire area in the length direction by engaging the engaging convex edge 25 with the fitting recess 12 of the housing 9. The holding member 16 clamps the scale device 4 with the attachment member 15 by the elastic force of the connecting leaf spring member 17 described later. In the holding member 16, the engagement convex edge portion 25 and the fitting concave portion 12 that are relatively fitted to each other have a wedge shape, so that the second reference surface 24 and the first reference surface 21 of the attachment member 15 are formed. On the other hand, the housing 9 of the scale device 4 is drawn.
[0026]
As shown in FIG. 2, the connecting leaf spring member 17 has a length substantially equal to that of the mounting member 15 and the holding member 16. The connecting leaf spring member 17 is mountain-folded with a substantially central portion in the width direction as an apex, both side edge portions are formed as fixed end portions 26 and 27, and the apex portion is configured as an elastic displacement portion 28. A large number of attachment holes 26 a and 27 a are formed in the fixed end portions 26 and 27 in the connecting leaf spring member 17, respectively.
[0027]
As shown in FIG. 1, the connecting plate spring member 17 configured as described above is fixed to a spring mounting surface 20 having one fixed end portion 26 formed on the side surface of the convex portion 19 of the mounting member 15 with a mounting screw (not shown). Is done. The connecting plate spring member 17 is fixed to a spring mounting surface 23 formed on the holding member 16 by the other fixed end portion 27 by a mounting screw (not shown). The connecting leaf spring member 17 is attached in such a manner that the elastic displacement portion 28 extends over the entire area in the length direction in the opposing space portion between the attachment member 15 and the holding member 16. As shown in FIGS. 1 and 2B, the connecting leaf spring member 17 is combined with the mounting member 15 mounted on the main body machine 2 in a suspended state over the entire region in the length direction. Like that. The connecting leaf spring member 17 applies an elastic force so as to pull the attachment member 15 and the holding member 16 together.
[0028]
The connecting leaf spring member 17 is a long and integral member having a length substantially equal to that of the mounting member 15 and the holding member 16, but may be a leaf spring member divided into a plurality of pieces. . Such a leaf spring member is preferably fixed at substantially equal intervals to the attachment member 15 and the holding member 16 so that an equal elastic force is generated in the length direction.
[0029]
The holding device 1 is configured so that the mounting member 15 extends over the entire moving region of the movable portion 3 with respect to the scale mounting surface 6 of the main body machine 2 in a state where the above-described constituent members 15 to 17 are assembled. It is attached. As shown in FIGS. 3 and 2B, the holding device 1 exposes the first reference surface 21 of the mounting member 15 and the second reference surface 24 of the holding member 16, so that the reference surfaces 21, 24 are exposed. An assembly space portion H of the scale device 4 surrounded by the bottom surface of the mounting member 15 and the engaging convex edge portion 25 of the holding member 16 is configured. In the holding device 1, an attachment member 15 that is directly attached to the main machine 2 and a holding member 16 that positions and holds the scale device 4 as described later are connected via a connecting leaf spring member 17 over the entire length direction. Has been.
[0030]
Accordingly, in the holding device 1, even if the scale mounting surface 6 of the main machine 2 has a slight undulation, the influence is absorbed by the connecting leaf spring member 17, and the second reference surface 24 formed on the holding member 16 is accurate. Is located. Of course, the holding device 1 may attach the attachment member 15 to the main body machine 2 in a state where the scale device 4 is assembled as will be described later.
[0031]
As shown in FIG. 4, the scale device 4 is pushed into the holding device 1 and attached to the holding device 1. As shown in FIGS. 5 and 6, the holding device 1 holds the scale device 4 in a state in which the fitting concave portion 12 of the housing 9 is fitted onto the engaging convex edge portion 25 of the holding member 16. The member 16 is pushed into the assembly space H while being pushed down. As shown in FIG. 6, the holding device 1 is configured such that the holding member 16 is displaced toward the main body machine 2 against the elastic force of the connecting leaf spring member 17 to increase the height of the assembly space H. The upper part of the housing 9 of the scale device 4 is allowed to pass through the stopper projection 15a of the mounting member 15.
[0032]
In the holding device 1, the pressing operation of the scale device 4 is stopped in a state where the upper portion of the housing 9 passes through the stopper protrusion 15 a and the attachment reference surface 10 abuts on the first reference surface 21 of the attachment member 15. Then, the connecting leaf spring member 17 is elastically returned to the initial state. As shown in FIG. 7, the holding device 1 holds the housing 9 of the scale device 4 between the bottom surface of the mounting member 15 and the engaging convex edge portion 25 of the holding member 16 by the elastic force of the connecting leaf spring member 17. To do. In the holding device 1, the elastic force of the connecting leaf spring member 17 acts in a direction in which the scale device 4 is pulled toward the main body machine 2 by the shape of the fitting concave portion 12 and the engaging convex edge portion 25 described above. The attachment reference surface 10 of the body 9 is pressed against the first reference surface 21 and the second reference surface 24 to hold the scale device 4 in a positioned state.
[0033]
As described above, the holding device 1 is mounted with the scale device 4 by one-touch operation, and attaches the scale device 4 to the main body machine 2. The holding device 1 positions and holds the scale device 4 with respect to the main body machine 2 over the entire moving region of the movable portion 3 by the second reference surface 24 of the holding member 16. Even when the holding device 1 is formed of a metal member having a slightly low mechanical rigidity such as an aluminum material, the scale device 4 is highly accurate with respect to the main body machine 2 even when the structural member of the scale device 4 and the housing 9 of the scale device 4 are formed of a metal material. Position and attach to the. The holding device 1 can be reduced in weight by forming the structural member together with the scale device 4 from a lightweight metal material such as an aluminum material. The holding device 1 can be formed with high accuracy even when it is long and is easy to handle.
[0034]
The holding device 1 holds the scale device 4 between the mounting member 15 and the holding member 16 by the elastic force of the connecting leaf spring member 17 as described above, but when a large vibration or the like is applied from the main body machine 2. There is a risk of moving in the length direction. In the holding device 1, as shown in FIG. 8, a mounting hole 29 penetrating in the vertical direction is formed in the mounting member 15, and the housing 9 of the scale device 4 is fixed by screwing a mounting screw 30 into the mounting hole 29. You may make it do. Of course, the housing 9 has an attachment hole corresponding to the attachment hole 29 of the attachment member 15 (not shown).
[0035]
As described above, the holding device 1 is configured such that the scale device 4 is not directly fixed to the main body machine 2, and the scale device 4 is firmly fixed to the mounting member 15 that is directly fixed to the main body machine 2. In this case, the same problem as in the conventional case arises. The holding device 1 is configured such that the scale device 4 is fixed to the attachment member 15 by the attachment screw 30 at one place in the substantially central portion in the length direction. Note that the holding device 1 only needs to fix the scale device 4 in the length direction with respect to the attachment member 15. For example, the holding device 1 is engaged with an engagement convex portion that is relatively engaged with the opposing surface of the attachment member 15 and the housing 9. Locking means composed of recesses may be formed to achieve the same effect.
[0036]
Since the holding device 1 is long together with the scale device 4, the scale device 4 is fixed in a balanced and stable state by being fixed at a substantially central portion in the length direction as described above. In the scale device 4, the mounting member 15 and the holding member 16 are separated from each other and the holding device 1 connected by the connecting leaf spring member 17 reduces the measurement error due to the thermal expansion accompanying the temperature change. As a reference, expansion and contraction occur with temperature change. The scale device 4 is generally provided with a reference point at the center as the origin. Accordingly, the holding device 1 fixes the scale device 4 to the attachment member 15 in the vicinity of the origin at the substantially central portion, thereby reducing the positional deviation and performing highly accurate measurement.
[0037]
【The invention's effect】
As described above in detail, according to the holding device of the scale device according to the present invention, the mounting member attached to the main body machine side and the holding member holding the scale device are combined by the elastic connecting member, and the mounting member and the holding member are combined. Since the scale device is sandwiched between and attached to the main body machine, the scale on the main body machine side with respect to the scale device formed of a material with relatively low mechanical rigidity or high precision High precision measurement is performed by the scale device without directly affecting the surface accuracy of the mounting surface, the mounting state, or the difference in thermal expansion due to temperature change. According to the holding device, the operability can be improved by allowing the scale device to be attached by an extremely simple operation such as pushing the scale device into the assembly space portion formed between the attachment member and the holding member. The holding device, together with the scale device, can be formed with high accuracy and light weight even if the attachment member and the holding member are made of a lightweight metal material such as an aluminum material, and the handling becomes easy. .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part for explaining a use state of a holding device of a scale device according to the present invention.
2A is an exploded perspective view, and FIG. 2B is a perspective view in an assembled state. FIG.
FIG. 3 is a main part longitudinal sectional view for explaining an operation of attaching the holding device to the main body machine.
FIG. 4 is an exploded perspective view of a main part for explaining an assembling operation of the scale device to the holding device.
FIG. 5 is a perspective view of a main part in a state where the scale device is assembled to the holding device.
FIG. 6 is a longitudinal sectional view of a main part for explaining an assembling operation of the scale device to the holding device.
FIG. 7 is a longitudinal sectional view of a main part in a state where the scale device is assembled to the holding device.
FIG. 8 is a perspective view of relevant parts for explaining a fixing operation between the holding device and the scale device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Holding device, 2 Main body machine, 3 Movable part, 4 Scale apparatus, 5 Scale head, 6 Scale mounting surface, 9 Housing | casing, 10 Mounting reference surface, 11, 12 Fitting recessed part, 15 Mounting member, 16 Holding member, 17 Connecting leaf spring member, 18 positioning mounting surface, 19 convex portion, 21 first reference surface, 24 second reference surface, 25 engaging convex edge portion, 28 elastic displacement portion, 29 mounting hole, 30 mounting screw

Claims

In a holding device that has a long casing and positions and holds the scale device that detects the position information of the movable part of the main machine on the main machine side,
A positioning mounting surface fixed to the scale mounting surface on the main machine side and a first reference surface with which a mounting reference surface formed on the housing of the scale device abuts are provided, via mounting means The positioning attachment surface is fixedly attached to the scale attachment surface, and a long attachment member that holds the attachment reference surface of the scale device and the first side surface orthogonal to the attachment reference surface;
A second reference surface that is positioned with respect to the scale mounting surface on the main machine side by contacting the mounting reference surface of the scale device, and is formed orthogonal to the second reference surface, and A long holding member formed with holding means for holding the second side surface orthogonal to the mounting reference surface;
The connecting member and the holding member are connected, and the elastic connecting member is urged in a pulling direction with each other.
A holding device for a scale device, wherein the scale device is sandwiched between the mounting member and a holding member by an elastic force of the elastic connecting member, and is attached and held in a state of being positioned with respect to the scale mounting surface.

The elastic connecting member is made of an integral leaf spring material whose both ends are interposed between the mounting member and the holding member over the entire region in the length direction and whose central portion is bent in a cross-sectional shape. The holding device for a scale device according to claim 1.

2. The scale device according to claim 1, wherein at least one locking means for locking the scale device with respect to the length direction is provided on the attachment member at a substantially central portion in the length direction. Holding device.