JP3829671B2

JP3829671B2 - Portable electric cutting tool

Info

Publication number: JP3829671B2
Application number: JP2001272420A
Authority: JP
Inventors: 章小野瀬; 晋二高野
Original assignee: Hitachi Koki Co Ltd
Current assignee: Koki Holdings Co Ltd
Priority date: 2001-09-07
Filing date: 2001-09-07
Publication date: 2006-10-04
Anticipated expiration: 2021-09-07
Also published as: JP2003080418A

Description

【０００１】
【発明の属する技術分野】
本発明は、光線照射装置を搭載した携帯用切断工具に関するものである。以下、携帯用切断工具を携帯用電気丸鋸を例に取り説明する。
【０００２】
【従来の技術】
作業者が携帯用切断工具を用いて正確な切断作業をする時の方法は、図５に示すように被切断材６上にケガキ線１３を描き、ケガキ線１３に鋸刃２の刃先部２ａのどちらか一方の側面１２ａ、１２ｂを沿わせながら切断を行う方法があり、図５（ａ）に示すように刃先部２ａの一方の側面１２ａ（本体側）をケガキ線１３に沿わせながら切断する方法と、あるいは図５（ｂ）に示すように刃先部２ａの他方の側面１２ｂ（反本体側）をケガキ線１３に沿わせながら切断する方法の２つの作業方法を作業者は使い分け切断作業を行っている。
【０００３】
上記したようにケガキ線１３に沿った切断作業を精度良く行うことができるようにすると共に、上記したように切断方法を使い分けるための作業を精度良く行うことができるようにしたレーザ発振器搭載の携帯用電気丸鋸がＵＳ５３７５４９５公報に開示されている。
【０００４】
上記携帯用電気丸鋸は図６に示すように、鋸刃２外周とベース１底面とが交差する交点Ｇの接線Ｈよりもレーザ発振器４を前方に配置し、レーザ光線５が鋸刃２に当接可能なように鋸刃２側に向かって照射させる構成をしていると共に、レーザ光線５が鋸刃２の刃先部２ａのどちらか一方の側面１２ａ、１２ｂに沿って照射することができるようにレーザ発振器４が鋸刃２の回転軸方向に平行移動可能に設けられた構成となっている。
【０００５】
図７は図６のＥ−Ｅ線断面図であり、鋸刃２の刃先部２ａ付近における鋸刃２とレーザ光線５が照射されることにより被切断材６上に表れたライン１１との関係を示すものである。図７（ａ）はライン１１が鋸刃２の刃先部の一方の側面１２ａに沿うようにレーザ発振器４の鋸刃２の回転軸方向における位置が設定された状態を示し、図７（ｅ）はライン１１が鋸刃２の刃先部の他方の側面１２ｂに沿うようにレーザ発振器４の位置を設定した状態を示し、図７（ｂ）〜図７（ｃ）は図７（ａ）の状態からレーザ発振器４を平行移動させ図７（ｅ）の状態になる中間の状態を示している。
【０００６】
なお、鋸刃２の刃先部２ａのどちらか一方の側面１２ａ、１２ｂのいずれかにレーザ光線５を照射させる作業は、図６及び図７に示すように被切断材６の端面６ａに鋸刃２の刃先部２ａを突き当てた状態で行われる。
【０００７】
【発明が解決しようとする課題】
正確な切断作業を行なうには、図５（ａ）及び図５（ｂ）に示すように被切断材６上に描かれたケガキ線１３に刃先部２ａのどちらか一方の側面１２ａ、１２ｂを沿わせながら切断するものであるが、上記したようにレーザ発振器４を採用した従来の携帯用電気丸鋸においては、レーザ光線４により被切断材６上に照射されるライン１１を図７（ａ）及び図７（ｅ）に示すように刃先部２ａの側面１２ａ、１２ｂに合わせた状態で切断作業を行なうことが重要である。
【０００８】
しかしながら、上記した従来の携帯用電気丸鋸では、鋸刃２外周とベース１底面とが交差する交点Ｇの接線Ｈよりもレーザ発振器４を前方に配置し、レーザ光線５が鋸刃２に当接可能なように鋸刃２側に向かって照射させる構成をしたものであり、刃先部２ａのどちらか一方の側面１２ａ、１２ｂにレーザ光線５を合わせる際には、レーザ発振器４の平行移動調整を行いながら、刃先部２ａに対する端面６ａ付近の被切断材６上に照射されるライン１１との関係を刃先部２ａを直接目視することにより行わなければならないものであると共に、刃先部２ａが被切断材６上面付近の端面に当接されていない状態では、ライン１１と刃先部２ａとの関係が把握できるように鋸刃２を回転させなければならいものであり、上記したように刃先部２ａの側面１２ａ、１２ｂにライン１１を合わせる作業が容易に行えないものであるという欠点があった。
【０００９】
また、携帯用電気丸鋸に一般的に使用される鋸刃２は図８及び図９に示すように、２種類の形状をした刃先部２ａが互い違いに配置された形状をしており、この種の鋸刃２を使用して切断作業を行った際には被切断材６が切断される幅寸法は図９に示す幅Ｄとなり、上述した刃先部２ａの側面１２ａ、１２ｂはそれぞれ突出した部分となる。この種の鋸刃２を上記した従来の携帯用電気丸鋸に採用し上述したように刃先部２ａの側面１２ａ、１２ｂにライン１１を合わせる作業を行った場合には、鋸刃２の回転位置によって被切断材６上面近傍の被切断材６の端面６ａに当接する刃先部２ａの形状が異なるために、鋸刃２を適正な回転位置に位置させた状態でなければ刃先部２ａのどちらか一方の側面１２ａ、１２ｂとライン１１とを合わせることができないものであり、刃先部２ａの側面１２ａ、１２ｂにライン１１を合わせる作業が非常に困難なものであった。
【００１０】
また、刃先部２ａの反本体側の側面１２ｂにライン１１を合わせる作業については、鋸刃２の側面側が開放されているために切断方向後方側から刃先部２ａとライン１１との関係を目視することができるものであるが、本体側の側面１２ａにライン１１を合わせる作業については、鋸刃２の本体側側面が閉塞されているために切断方向後方側から刃先部２ａとライン１１との関係を目視することが比較的困難であるという欠点があった。
【００１１】
本発明の目的は、上記欠点を解消し、鋸刃の刃先部のどちらか一方の側面に光線を合わせる作業を容易に行うことができ、作業性が良い携帯用電動切断工具を提供することである。
【００１２】
【課題を解決するための手段】
上記目的は、光線照射装置を鋸刃の外周とベース底面とが交差する交点に対する接線方向よりも切断方向後方に配置すると共に鋸刃の回転軸方向に平行移動可能でラインを平行移動させることができるようにし、且つ鋸刃の切断方向前方であって回転軸方向における刃先部の範囲内に光線によるラインを照射可能とし、刃先部の範囲内に光線の少なくとも一部が位置する際に、光線の一部が刃先部に遮られる構成とすることにより達成される。
【００１３】
【発明の実施の形態】
本発明携帯用電気丸鋸の一実施形態を図１〜図４を用いて説明する。
【００１４】
図１に示すように携帯用電気丸鋸は、電動機（図示せず）を内蔵した本体と、本体に回動可能に保持され、電動機を動力として回転駆動する鋸刃２と、本体に設けられ鋸刃２の一部を覆う形状をしたソーカバー３と、本体に取付けられ鋸刃２の一部を下方に突出可能な開口部（図示せず）を有し切断作業時に被切断材６上面を摺動可能なベース１と、鋸刃２の切断方向延長上にレーザ光線５を照射可能な光線照射装置であるレーザ発振器４とを有する構成をしている。
【００１５】
レーザ発振器４はソーカバー３上に載置された構成となっており、レーザ発振器４近傍のソーカバー３外周には、レーザ発振器４が発振するレーザ光線５の照射範囲内であり、レーザ光線５が通過可能な穴３ａが設けられている。従って、レーザ発振器４が発振したレーザ光線５は図１に示すように、ベース１の切断方向前方端部及びベース1の端部よりも切断方向前方側の被切断材６上を照射可能な構成となっていると共に、ソーカバー３の穴３ａを介してソーカバー３内部を通過したレーザ光線５は鋸刃２の切断部（鋸刃２外周とベース１底面とが交差する交点Ｇ）付近の被切断材６上を照射する。なお、図２の符号７はレーザ光線４が被切断材６上に照射されることによって表れるラインである。
【００１６】
また、レーザ発振器４は図１に示すように鋸刃２外周とベース１底面とが交差する交点Ｇに対する接線Ｈよりも切断方向後方に配置されている。
【００１７】
レーザ発振器４から発振されるレーザ光線５は、図１及び図２に示すように鋸刃２の切断部である交点Ｇよりも切断方向後方を照射することができるようになっていると共に、予め鋸刃２の長手方向と平行して延びるように設定されている。また、レーザ光線５が鋸刃２の回転軸方向に平行移動可能なようにレーザ発振器４を平行移動させる調整機構が図３に示すように設けられており、これにより鋸刃２の刃先部２ａのいずれか一方の側面１２ａ、１２ｂにレーザ光線４を合わせる作業を選択して行うことができるようにしている。すなわち、図２に示す状態では被切断材６上に表れたライン１１が鋸刃２の刃先部２ａの一方の側面１２ａ（本体側）に合わさり、一方の側面１２ａにレーザ光線５が合わさった状態となっているが、レーザ光線５を平行移動させることにより他方の側面１２ｂ（反本体側）にレーザ光線５を合わせることが可能となる。
【００１８】
次に上記したレーザ発振器４を平行移動させる調整機構について図３を用いて説明する。
【００１９】
図に状態ではレーザ光線発振器４のレーザ光線５を発振する部分Ｃは鋸刃２の一方の側面１２ａ（本体側）に位置した状態にある。レーザ光線発振器４は図に示すように取付け部４ａを介して移動部材２０に固定されている。移動部材２０にはレーザ光線発振器５を挟む位置にねじ穴２０ａと穴２０ｂが設けられている。移動部材２０のねじ穴２０ａには、ソーカバー３に固定される固定部材２２の貫通穴２２ａ内に挿入されたボルト２１がねじ嵌合していると共に、移動部材２０と固定部材２２との間にはスプリング２３、２４が配置されており、移動部材２０は常に固定部材２２から離れる方向に付勢されている。また、固定部材２２には貫通穴２２ｂにピン２５が圧入されており、ピン２５上を移動部材２０が摺動可能なようにピン２５が貫通穴２０ｂ内に配置されている。
【００２０】
上記したような構成としたことにより、ボルト２１が移動部材２０のねじ穴２０ａに対して締まる方向にボルト２１を回転させると、移動部材２０のボルト２１側はスプリング２３の付勢力に抗して固定部材２２に近づく方向に移動する。これに伴って移動部材２０のピン２５側はピン２５と貫通穴２０ｂとの係合によって固定部材２２に近づく方向に移動し、移動部材２０はボルト２１及びピン２５の軸方向に平行移動することとなる。また、ボルト２１が移動部材２０のねじ穴２０ａに対して緩まる方向にボルト２１を回転させると、移動部材２０のボルト２１側は固定部材２２から離れる方向に移動し、これに伴って移動部材２０のピン２５側はスプリング２４の付勢力により固定部材２２から離れる方向に移動する。ボルト２１及びピン２５は軸方向が鋸刃１の回転軸方向と一致するように設けられており、これによりレーザ光線５は鋸刃２の回転軸方向に平行移動することとなる。すなわち、ボルト２１の回転操作によってレーザ光線５の照射位置を鋸刃２の回転軸方向に平行移動させることができるので、作業状況等に応じてレーザ光線５を鋸刃２の刃先部２ａのどちらか一方の側面１２ａ、１２ｂに合わせることが可能となる。なお、図２に示す状態はレーザ光線４を発振する部分Ｃが刃先部２ａの一方の側面１２ａに合う状態となっているが、この状態からボルト２１とねじ穴２０ａとのねじ嵌合を緩める方向にボルト２１を回転させれば、レーザ光線４の照射位置を鋸刃１の中央部もしくは他方の側面に合わせることができる。また、スプリング２３は、ボルト２１とねじ穴２０ａとのねじ部に存在する若干の隙間によってレーザ光線発振装置５が振動してしまうことを防止する目的で設けられている。
【００２１】
上記したようなレーザ発振器４を平行移動させる機構を操作した状態を、図４に示す鋸刃２と被切断材６上に表れたライン１１との関係を用いて説明する。なお、図４は切断作業開始前に鋸刃２を被切断材６の端面６ａに当接させ、レーザ発振器４を平行移動させることにより刃先部２ａのどちらか一方の側面１２ａ、１２ｂにレーザ光線５を合わせる作業を示す。
【００２２】
図４（ａ）は、刃先部２ａの一方の側面１２ａにライン１１が合わさり刃先部２ａの一方の側面１２ａにレーザ光線５が合わさっている状態を示し、図４（ｅ）は刃先部２ａの他方の側面１２ｂにライン１１が合わさっている状態を示し、図４（ｂ）〜図４（ｄ）は図４（ａ）の状態から図４（ｅ）の状態となるようにレーザ発振器４を平行移動させた中間の状態を示している。
【００２３】
図４（ａ）に示すように刃先部２ａの一方の側面１２ａにライン１１が合わさり刃先部２ａの一方の側面１２ａにレーザ光線５が合わさっている状態からレーザ光線５を刃先部２ａの他方の側面１２ｂに合わせるには、上記した図３に示すボルト２１をボルト２１と移動部材２０のねじ穴２０ａとのねじ嵌合が緩む方向に回転操作することにより行われるものであるが、レーザ発振器４の平行移動に合わせてライン１１が図４（ａ）に示す状態から図４（ｅ）に示す状態へと平行移動する間は図４（ｂ）〜図４（ｄ）に示すように、被切断材６の端面からＬの範囲分ライン１１が消えることになる。これは、レーザ発振器４のレーザ光線５を発振する部分Ｃが鋸刃２上に位置し、レーザ光線５が鋸刃２に当接している状態では、図１に示すようにレーザ光線５と鋸刃２の外周とが交差するＫ点よりも切断方向後方側についてはレーザ光線５が鋸刃２によってさえぎられるためであり、鋸刃２外周とベース１底面との交差する交点Ｇに対する接線Ｈよりもレーザ発振器４を切断方向後方に配置すると共にレーザ光線５が前記交点Ｇよりも切断方向後方側を照射可能とし、更にレーザ発振器４を鋸刃２の回転軸方向に平行移動可能な構成としたことにより成し得るものである。
【００２４】
なお、図４（ｂ）〜図４（ｄ）の状態でライン１１の消える部分は、レーザ光線５が交点Ｇよりも上方に位置する複数の刃先部２ａによってさえぎられることによって生じるものであり、このため、ライン１１の一部が消える状態にある時には、レーザ光線５が刃先部２ａの幅寸法Ｄ内に位置していることを表している。
【００２５】
従って本発明携帯用電気丸鋸では、レーザ光線５を刃先部２ａのどちらか一方の側面１２ａ、１２ｂに合わせる際には、ライン１１が寸法Ｌの範囲で消えるか否かを確認しながらレーザ発振器４を平行移動させる作業を行えば良く、容易にレーザ光線５と刃先部２ａのどちらか一方の側面１２ａ、１２ｂとが合わさっているか否かを把握することができるため、上記合わせ作業を容易に行うことができる。また、刃先部２ａを直接目視することにより刃先部２ａとライン１１との関係を把握しなしなくとも、ライン１１の状態（一部が消えるか否か）を確認するのみでレーザ光線５と刃先部２ａとの関係を容易に把握することができると共に、鋸刃２の回転位置がライン１１近傍に刃先部２ａが位置する回転位置になくとも、刃先部２ａの幅Ｄ内にレーザ光線５が位置した状態にあるか否かを容易に把握することができ、レーザ光線５を刃先部２ａの側面１２ａ、１２ｂに合わせる作業時に鋸刃２の回転位置に制限されないものであり、容易に上記合わせ作業を行うことができるものである。
【００２６】
なお、図８及び図９に示すように形状の異なる刃先部２ａが互い違いに配置された鋸刃２であっても上記したのと同様に複数の刃先部２ａによってレーザ光線５がさえぎられることにより、レーザ光線５が刃先部２ａの幅Ｄ内に位置している際にはライン１１が消えるため、容易に上記合わせ作業を行うことができる。
【００２７】
また、ライン１１の状態（一部が消えるか否か）を確認するのみでレーザ光線５と刃先部２ａとの関係を容易に把握することができるものであるため、レーザ光線５を刃先部２ａの本体側の側面１２ａに合わせる際にも切断方向後方から容易に上記合わせ作業を行うことができるものである。
【００２８】
なお、上記実施形態では、ソーカバー３上にレーザ発振器４を載置し、ソーカバー３に穴３ａを設けることにより、交点Ｇよりも切断方向後方の個所をレーザ光線５によって照射可能な構成としたが、レーザ発振器４をソーカバー３内部に配置する構成としても良いものである。
【００２９】
また、上記実施形態では、レーザ発振器４を鋸刃２の回転軸方向に平行移動させる機構が設けられた構成としたが、この機構に加えて、レーザ光線５が発振する部分Ｃを支点としてレーザ光線５が回転可能なようにレーザ発振器４を回転させる機構及びレーザ光線５とベース１底面に対する垂直度を調整可能なようにベース９底面に対して直交するよう延びた支点部を支点としてレーザ発振器４を回転させる機構等を備えた構成としても良い。
【００３０】
【発明の効果】
本発明によれば、被切断材上に表れたラインを確認するのみで光線が刃先部の幅内に位置している状態を容易に把握することができ、光線を刃先部のどちらか一方の側面に合わせる作業を容易に行うことができ、作業性が良い携帯用電動切断工具を提供することができるようになる。
【図面の簡単な説明】
【図１】本発明携帯用電動切断工具の一実施形態を示す要部断面正面図。
【図２】図１のＡ−Ａ線断面図。
【図３】図１のＢ−Ｂ線断面図。
【図４】図１に示す携帯用電動切断工具を用いた際の鋸刃と被切断材上に表れたラインとの関係を示す説明図。
【図５】従来の携帯用電気丸鋸の切断方法を示す説明図。
【図６】従来の携帯用電気丸鋸の一例を示す要部断面正面図。
【図７】図６に示す携帯用電気丸鋸を用いた際の鋸刃と被切断材上に表れたラインとの関係を示す説明図。
【図８】携帯用電気丸鋸に使用される鋸刃の一例を示す要部拡大正面図。
【図９】図８のＦ方向矢視要部拡大図。
【符号の説明】
１はベース、２は鋸刃、３はソーカバー、４はレーザ発振器、５はレーザ光線、６は被切断材、６ａは被切断材端面、１２ａ、１２ｂは刃先部側面である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable cutting tool equipped with a light irradiation device. Hereinafter, a portable cutting tool will be described by taking a portable electric circular saw as an example.
[0002]
[Prior art]
As shown in FIG. 5, the worker performs an accurate cutting operation using a portable cutting tool by drawing a marking line 13 on the material 6 to be cut, and the cutting edge 2 a of the saw blade 2 on the marking line 13. There is a method of cutting along one of the side surfaces 12a and 12b, and cutting one side surface 12a (main body side) of the blade edge portion 2a along the marking line 13 as shown in FIG. The operator uses the two cutting methods, or a method of cutting the other side surface 12b (on the main body side) of the blade edge portion 2a along the marking line 13 as shown in FIG. It is carried out.
[0003]
As described above, it is possible to perform the cutting operation along the marking line 13 with high accuracy, and to carry the operation for selectively using the cutting method as described above with high accuracy. An electric circular saw is disclosed in US Pat. No. 5,375,495.
[0004]
In the portable electric circular saw, as shown in FIG. 6, the laser oscillator 4 is disposed in front of the tangent H of the intersection G where the outer periphery of the saw blade 2 and the bottom surface of the base 1 intersect, and the laser beam 5 is applied to the saw blade 2. The laser beam 5 can be irradiated along one of the side surfaces 12a and 12b of the cutting edge portion 2a of the saw blade 2 while being configured to irradiate toward the saw blade 2 side so as to be able to come into contact. Thus, the laser oscillator 4 is configured to be movable in the direction of the rotation axis of the saw blade 2.
[0005]
FIG. 7 is a cross-sectional view taken along line E-E in FIG. 6, and the relationship between the saw blade 2 near the cutting edge 2 a of the saw blade 2 and the line 11 appearing on the workpiece 6 when irradiated with the laser beam 5. Is shown. FIG. 7A shows a state in which the position in the rotation axis direction of the saw blade 2 of the laser oscillator 4 is set so that the line 11 is along one side surface 12a of the cutting edge portion of the saw blade 2. FIG. 7 shows a state in which the position of the laser oscillator 4 is set so that the line 11 is along the other side surface 12b of the cutting edge portion of the saw blade 2, and FIGS. 7B to 7C show the state of FIG. 7 shows an intermediate state in which the laser oscillator 4 is translated from the state shown in FIG.
[0006]
The operation of irradiating one of the side surfaces 12a and 12b of the blade edge 2a of the saw blade 2 with the laser beam 5 is performed on the end surface 6a of the workpiece 6 as shown in FIGS. It is performed in a state where the two blade edge portions 2a are abutted.
[0007]
[Problems to be solved by the invention]
In order to perform an accurate cutting operation, as shown in FIGS. 5A and 5B, either one of the side surfaces 12a and 12b of the blade edge portion 2a is attached to the marking line 13 drawn on the material 6 to be cut. In the conventional portable electric circular saw employing the laser oscillator 4 as described above, the line 11 irradiated on the workpiece 6 by the laser beam 4 is shown in FIG. ) And FIG. 7 (e), it is important to perform the cutting operation in accordance with the side surfaces 12a and 12b of the blade edge portion 2a.
[0008]
However, in the above-described conventional portable electric circular saw, the laser oscillator 4 is disposed in front of the tangent line H of the intersection G where the outer periphery of the saw blade 2 and the bottom surface of the base 1 intersect, and the laser beam 5 strikes the saw blade 2. It is configured to irradiate toward the saw blade 2 so as to be able to come into contact. When the laser beam 5 is aligned with one of the side surfaces 12a and 12b of the blade edge portion 2a, the parallel movement adjustment of the laser oscillator 4 is adjusted. While performing the above, the relationship between the blade 11 and the line 11 irradiated on the workpiece 6 near the end face 6a must be observed by directly observing the blade 2a, and the blade 2a is covered. In a state where the cutting material 6 is not in contact with the end face near the upper surface, the saw blade 2 must be rotated so that the relationship between the line 11 and the blade edge portion 2a can be grasped. As described above, the blade edge portion 2a. Side 12a, has a drawback that work to align the line 11 to 12b is one that is not easy to.
[0009]
Further, the saw blade 2 generally used for portable electric circular saws has a shape in which the blade tip portions 2a having two kinds of shapes are alternately arranged as shown in FIGS. When the cutting operation is performed using the seed saw blade 2, the width dimension of the material 6 to be cut is the width D shown in FIG. 9, and the side surfaces 12a and 12b of the above-mentioned blade edge portion 2a protrude. Part. When this type of saw blade 2 is employed in the above-described conventional portable electric circular saw and the operation of aligning the line 11 with the side surfaces 12a and 12b of the blade edge portion 2a as described above, the rotational position of the saw blade 2 is performed. Since the shape of the blade edge portion 2a contacting the end surface 6a of the workpiece 6 near the upper surface of the workpiece 6 differs depending on the cutting edge 6a, if the saw blade 2 is not positioned at an appropriate rotational position, either the blade edge portion 2a is used. The one side surface 12a, 12b and the line 11 cannot be aligned, and the operation of aligning the line 11 with the side surface 12a, 12b of the blade edge portion 2a is very difficult.
[0010]
Moreover, about the operation | work which aligns the line 11 with the side surface 12b of the blade edge | tip part 2a on the opposite main body side, since the side surface side of the saw blade 2 is open | released, the relationship between the blade edge | tip part 2a and the line 11 is visually observed from a cutting direction back side. As for the operation of aligning the line 11 with the side surface 12a on the main body side, since the side surface on the main body side of the saw blade 2 is closed, the relationship between the cutting edge portion 2a and the line 11 from the rear side in the cutting direction. There is a drawback that it is relatively difficult to visually check the image.
[0011]
An object of the present invention is to provide a portable electric cutting tool that eliminates the above-mentioned drawbacks, can easily perform the operation of aligning the light beam on one side surface of the blade edge portion of the saw blade, and has good workability. is there.
[0012]
[Means for Solving the Problems]
The purpose of the present invention is to arrange the light beam irradiation device behind the tangential direction with respect to the intersection where the outer periphery of the saw blade intersects with the base bottom surface, and to translate the line in parallel with the rotation direction of the saw blade. When the line by the light beam can be irradiated within the range of the blade edge part in the rotation axis direction in front of the cutting direction of the saw blade, and at least a part of the light beam is located within the blade edge part. This is achieved by adopting a configuration in which a part of the blade is blocked by the blade edge portion .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the portable electric circular saw of the present invention will be described with reference to FIGS.
[0014]
As shown in FIG. 1, a portable electric circular saw is provided in a main body with a built-in electric motor (not shown), a saw blade 2 that is rotatably held in the main body and is driven to rotate by using the electric motor as power. A saw cover 3 having a shape covering a part of the saw blade 2 and an opening (not shown) attached to the main body and capable of projecting a part of the saw blade 2 downward, the upper surface of the material 6 to be cut during cutting operation. The structure includes a slidable base 1 and a laser oscillator 4 which is a light beam irradiation device capable of irradiating a laser beam 5 on the cutting direction extension of the saw blade 2.
[0015]
The laser oscillator 4 is mounted on the saw cover 3, and the outer periphery of the saw cover 3 near the laser oscillator 4 is within the irradiation range of the laser beam 5 oscillated by the laser oscillator 4, and the laser beam 5 passes therethrough. A possible hole 3a is provided. Therefore, as shown in FIG. 1, the laser beam 5 oscillated by the laser oscillator 4 can irradiate the front end portion in the cutting direction of the base 1 and the workpiece 6 on the front side in the cutting direction from the end portion of the base 1. The laser beam 5 that has passed through the inside of the saw cover 3 through the hole 3a of the saw cover 3 is to be cut in the vicinity of the cutting portion of the saw blade 2 (intersection G where the outer periphery of the saw blade 2 intersects the bottom surface of the base 1). The material 6 is irradiated. 2 is a line that appears when the laser beam 4 is irradiated onto the material 6 to be cut.
[0016]
Further, as shown in FIG. 1, the laser oscillator 4 is disposed behind the tangent line H to the intersection point G where the outer periphery of the saw blade 2 and the bottom surface of the base 1 intersect.
[0017]
The laser beam 5 oscillated from the laser oscillator 4 can irradiate the cutting direction rearward from the intersection point G which is the cutting portion of the saw blade 2 as shown in FIGS. It is set to extend in parallel with the longitudinal direction of the saw blade 2. Further, an adjustment mechanism for moving the laser oscillator 4 in parallel so that the laser beam 5 can be translated in the direction of the rotation axis of the saw blade 2 is provided as shown in FIG. The operation of aligning the laser beam 4 with any one of the side surfaces 12a and 12b can be selected and performed. That is, in the state shown in FIG. 2, the line 11 appearing on the workpiece 6 is aligned with one side surface 12a (main body side) of the cutting edge 2a of the saw blade 2, and the laser beam 5 is aligned with one side surface 12a. However, by moving the laser beam 5 in parallel, it becomes possible to match the laser beam 5 to the other side surface 12b (on the main body side).
[0018]
Next, an adjustment mechanism for translating the laser oscillator 4 will be described with reference to FIG.
[0019]
In the state shown in the drawing, the portion C of the laser beam oscillator 4 that oscillates the laser beam 5 is located on one side surface 12a (main body side) of the saw blade 2. As shown in the figure, the laser beam oscillator 4 is fixed to the moving member 20 via an attachment portion 4a. The moving member 20 is provided with a screw hole 20a and a hole 20b at positions where the laser beam oscillator 5 is sandwiched. Bolts 21 inserted into the through holes 22a of the fixing member 22 fixed to the saw cover 3 are screwed into the screw holes 20a of the moving member 20, and between the moving member 20 and the fixing member 22. The springs 23 and 24 are arranged, and the moving member 20 is always urged away from the fixed member 22. Further, a pin 25 is press-fitted into the through hole 22b in the fixing member 22, and the pin 25 is disposed in the through hole 20b so that the moving member 20 can slide on the pin 25.
[0020]
With the above-described configuration, when the bolt 21 is rotated in a direction in which the bolt 21 is tightened with respect to the screw hole 20a of the moving member 20, the bolt 21 side of the moving member 20 resists the biasing force of the spring 23. It moves in a direction approaching the fixing member 22 . Along with this, the pin 25 side of the moving member 20 moves in the direction approaching the fixed member 22 by the engagement of the pin 25 and the through hole 20b, and the moving member 20 moves in parallel in the axial direction of the bolt 21 and the pin 25. It becomes. Further, when the bolt 21 is rotated in a direction in which the bolt 21 is loosened with respect to the screw hole 20a of the moving member 20, the bolt 21 side of the moving member 20 moves in a direction away from the fixed member 22 , and accordingly the moving member is moved. The pin 25 side of 20 moves in a direction away from the fixing member 22 by the urging force of the spring 24. The bolt 21 and the pin 25 are provided so that the axial direction thereof coincides with the rotational axis direction of the saw blade 1, whereby the laser beam 5 is translated in the rotational axis direction of the saw blade 2. That is, the irradiation position of the laser beam 5 can be translated in the direction of the rotation axis of the saw blade 2 by rotating the bolt 21, so that the laser beam 5 can be applied to either the cutting edge portion 2a of the saw blade 2 according to the work situation or the like. It becomes possible to match with one of the side surfaces 12a and 12b. In the state shown in FIG. 2, the portion C that oscillates the laser beam 4 is in a state that fits to one side surface 12 a of the blade edge portion 2 a. From this state, the screw fitting between the bolt 21 and the screw hole 20 a is loosened. If the bolt 21 is rotated in the direction, the irradiation position of the laser beam 4 can be adjusted to the central portion or the other side surface of the saw blade 1. The spring 23 is provided for the purpose of preventing the laser beam oscillation device 5 from vibrating due to a slight gap existing in the threaded portion between the bolt 21 and the screw hole 20a.
[0021]
A state in which the mechanism for moving the laser oscillator 4 as described above is operated will be described using the relationship between the saw blade 2 and the line 11 appearing on the workpiece 6 shown in FIG. In FIG. 4, before starting the cutting operation, the saw blade 2 is brought into contact with the end surface 6a of the material 6 to be cut, and the laser oscillator 4 is moved in parallel, whereby a laser beam is applied to one of the side surfaces 12a and 12b of the blade edge portion 2a. The work of combining 5 is shown.
[0022]
FIG. 4A shows a state in which the line 11 is aligned with one side surface 12a of the blade edge portion 2a and the laser beam 5 is aligned with one side surface 12a of the blade edge portion 2a, and FIG. The state where the line 11 is aligned with the other side surface 12b is shown, and the laser oscillator 4 is set so that FIGS. 4 (b) to 4 (d) change from the state of FIG. 4 (a) to the state of FIG. 4 (e). An intermediate state after translation is shown.
[0023]
As shown in FIG. 4A, from the state where the line 11 is aligned with one side surface 12a of the blade edge portion 2a and the laser beam 5 is aligned with one side surface 12a of the blade edge portion 2a, the laser beam 5 is transferred to the other side of the blade edge portion 2a. The adjustment to the side surface 12b is performed by rotating the bolt 21 shown in FIG. 3 in the direction in which the screw fit between the bolt 21 and the screw hole 20a of the moving member 20 is loosened. As shown in FIGS. 4 (b) to 4 (d), while the line 11 is translated from the state shown in FIG. 4 (a) to the state shown in FIG. The line 11 disappears from the end face of the cutting material 6 by the range of L. This is because when the portion C of the laser oscillator 4 that oscillates the laser beam 5 is located on the saw blade 2 and the laser beam 5 is in contact with the saw blade 2, the laser beam 5 and the saw are shown in FIG. This is because the laser beam 5 is interrupted by the saw blade 2 on the rear side in the cutting direction from the point K where the outer periphery of the blade 2 intersects, and from the tangent line H to the intersection G where the outer periphery of the saw blade 2 intersects the bottom surface of the base 1. Also, the laser oscillator 4 is arranged behind the cutting direction, the laser beam 5 can irradiate the rear side in the cutting direction from the intersection point G, and the laser oscillator 4 can be translated in the rotational axis direction of the saw blade 2. This can be achieved.
[0024]
In addition, the part where the line 11 disappears in the states of FIGS. 4B to 4D is caused by the laser beam 5 being interrupted by a plurality of cutting edge portions 2a located above the intersection G, For this reason, when a part of the line 11 is in a state of disappearing, it indicates that the laser beam 5 is positioned within the width dimension D of the blade edge portion 2a.
[0025]
Therefore, in the portable electric circular saw of the present invention, when the laser beam 5 is aligned with one of the side surfaces 12a and 12b of the cutting edge portion 2a, the laser oscillator is checked while confirming whether or not the line 11 disappears in the range of the dimension L. 4 can be performed in parallel, and since it is possible to easily grasp whether the laser beam 5 and one of the side surfaces 12a and 12b of the blade edge portion 2a are aligned, the above alignment operation is facilitated. It can be carried out. Further, the laser beam 5 and the blade edge can be obtained by simply confirming the state of the line 11 (whether or not part of it disappears) without having to grasp the relationship between the blade edge part 2a and the line 11 by directly observing the blade edge part 2a. The laser beam 5 can be easily grasped within the width D of the blade edge portion 2a even if the rotation position of the saw blade 2 is not at the rotation position where the blade edge portion 2a is positioned in the vicinity of the line 11 while the relationship with the portion 2a can be easily grasped. It is possible to easily grasp whether or not the laser beam 5 is positioned, and the laser beam 5 is not limited to the rotational position of the saw blade 2 when the laser beam 5 is aligned with the side surfaces 12a and 12b of the blade edge portion 2a. It can do work.
[0026]
As shown in FIGS. 8 and 9, even when the blade edges 2a having different shapes are arranged alternately, the laser beam 5 is blocked by the plurality of blade edges 2a as described above. When the laser beam 5 is positioned within the width D of the blade edge portion 2a, the line 11 disappears, so that the above alignment operation can be easily performed.
[0027]
Further, since the relationship between the laser beam 5 and the blade edge portion 2a can be easily grasped only by confirming the state of the line 11 (whether or not part of the line 11 disappears), the laser beam 5 is used as the blade edge portion 2a. Even when the main body side side surface 12a is aligned, the above-described alignment operation can be easily performed from the rear in the cutting direction.
[0028]
In the above embodiment, the laser oscillator 4 is mounted on the saw cover 3 and the hole 3a is provided in the saw cover 3, so that the portion behind the intersection G in the cutting direction can be irradiated with the laser beam 5. The laser oscillator 4 may be arranged inside the saw cover 3.
[0029]
In the above-described embodiment, a mechanism is provided in which the laser oscillator 4 is translated in the direction of the rotation axis of the saw blade 2. In addition to this mechanism, the laser beam 5 oscillates at a portion C as a fulcrum. A mechanism for rotating the laser oscillator 4 so that the light beam 5 can rotate, and a laser oscillator with a fulcrum extending perpendicular to the bottom surface of the base 9 so that the perpendicularity to the laser beam 5 and the bottom surface of the base 1 can be adjusted. It is good also as a structure provided with the mechanism etc. which rotate 4.
[0030]
【The invention's effect】
According to the present invention, it is possible to easily grasp the state in which the light beam is positioned within the width of the blade edge part only by confirming the line appearing on the material to be cut. It is possible to provide a portable electric cutting tool that can be easily fitted to the side surface and has good workability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view of an essential part showing an embodiment of a portable electric cutting tool of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
4 is an explanatory diagram showing a relationship between a saw blade and a line appearing on a material to be cut when the portable electric cutting tool shown in FIG. 1 is used.
FIG. 5 is an explanatory view showing a conventional method for cutting a portable electric circular saw.
FIG. 6 is a cross-sectional front view of an essential part showing an example of a conventional portable electric circular saw.
7 is an explanatory diagram showing a relationship between a saw blade and a line appearing on a material to be cut when the portable electric circular saw shown in FIG. 6 is used.
FIG. 8 is an enlarged front view of a main part showing an example of a saw blade used in a portable electric circular saw.
FIG. 9 is an enlarged view of a main part viewed in the direction of arrow F in FIG. 8;
[Explanation of symbols]
1 is a base, 2 is a saw blade, 3 is a saw cover, 4 is a laser oscillator, 5 is a laser beam, 6 is a material to be cut, 6a is an end surface of the material to be cut, and 12a and 12b are side surfaces of the cutting edge.

Claims

A main body having a built-in electric motor; a saw blade that is rotatably supported by the main body and is driven to rotate by using the electric motor as a power; and a cutting edge that defines a cutting width on an outer peripheral portion; of the saw cover in which the form covering portion, and slidable based workpiece upper surface during cutting work has a possible opening downwardly projecting part of the saw blade attached to said body, to be cut A portable electric cutting tool having a light beam irradiation device capable of irradiating a light beam for displaying a line indicating a cutting direction of the saw blade on a material upper surface, wherein the outer periphery of the saw blade and the base bottom surface intersect the light beam irradiation device. The cutting blade is disposed behind the tangential direction with respect to the intersecting point and is parallel to the rotational axis direction of the saw blade so that the line can be moved in parallel. Axis of rotation It is possible to irradiate the line by the light beam within the range of the blade edge part in the direction, and when at least a part of the light beam is located within the range of the blade edge part, a part of the light beam is blocked by the blade edge part. A portable electric cutting tool characterized by having a configuration .

2. The portable electric cutting tool according to claim 1, wherein the light beam irradiation device can irradiate a front side in a cutting direction with respect to an end portion of the base.

The portable electric cutting device according to claim 1 or 2, wherein the light irradiation device is disposed on the saw cover, and a hole is provided in the saw cover through which the light beam can pass within an irradiation range of the light beam. tool.