JP3661465B2

JP3661465B2 - Metal cutting machine

Info

Publication number: JP3661465B2
Application number: JP00273899A
Authority: JP
Inventors: 智彦川崎; 寿徳松下
Original assignee: Hitachi Koki Co Ltd
Current assignee: Koki Holdings Co Ltd
Priority date: 1999-01-08
Filing date: 1999-01-08
Publication date: 2005-06-15
Anticipated expiration: 2019-01-08
Also published as: JP2000198021A

Description

【０００１】
【発明の属する技術分野】
本発明は、切断刃物の保護カバーを有する金属用切断機に関するものである。
【０００２】
【従来の技術】
従来の金属用切断機は、チップソー、砥石等の切断刃物で金属の被切断材を切断する際、切断刃物外周方向に火花や高温の切屑が飛散するため、切断刃物の外周には鉄板の保護カバーが設けられていた。
【０００３】
【発明が解決しようとする課題】
従来、被切断材に記した切断位置を示す墨線に切断刃物の刃先を合わせるとき、切断刃物は鉄板の保護カバーで覆われ刃先が見えないため、保護カバーを持ち上げて切断刃物を露出させてから被切断材の墨線と刃先を一致させていた。
【０００４】
また、保護カバーを持ち上げなくても墨線が見えるように、透明な樹脂製の保護カバーにすると、切断時に切断刃物外周方向に飛散する火花等で保護カバーを焼損してしまう問題があった。
【０００５】
さらに、切断刃物の交換で保護カバーを上死点位置に持ち上げたあと、保護カバーを元の位置へ下げる際、保護カバーの上死点位置に対する重心位置の偏心量で自重落下させているが、切断刃物を交換するときは保護カバーを大きく上げなければならないため、偏心量を大きくできない。
【０００６】
重量の軽い樹脂製の保護カバーの場合、重心位置は図４に示すように保護カバーの回動支点に近いＧ１となる。図５に示すように、保護カバーの回動支点軸部などに切屑２１がつまっていると、保護カバーを自重落下させた際、回転モーメントが小さいため、下がりが悪くなり保護カバーが途中で止まってしまう。よって、保護カバーから切断刃物の一部が露出してしまうため、このまま使用すれば、火花や切屑が作業者側に飛散する問題があった。
【０００７】
本発明の目的は、保護カバーを上げなくても切断刃物の刃先が見えるようにしつつ、焼損しない保護カバーを提供することである。また、他の目的は保護カバーの回転力を大きくして、保護カバーを下がりやすくすることである。
【０００８】
【課題を解決するための手段】
上記目的は、被切断材を載置するベース部と、切断刃物を覆い、ほぼ円弧形状をした外周部を有する回動可能な保護カバーとを有する金属用切断機において、保護カバーを透明なカバーとし、前記外周部の内側に該外周部に沿うように金属板を設けることにより達成される。
【０００９】
【発明の実施の形態】
本発明の実施形態を図１〜図６により説明する。図１は金属用切断機の左側面図、図２は図１のＡ−Ａ線断面図、図３は図１の正面図、図４は保護カバーを上死点へ回動させたときの左側面図、図５は図４のＢ−Ｂ線断面図、図６は切断時の火花や切屑の飛散状態を示す部分左側面図である。
【００１０】
図において、ベース１の上面後方には被切断材２０を支持するフェンス２を固定するとともに、ベース１に被切断材２０を固定するバイス装置５を設けている。ベース１のほぼ中央に水平方向へ回動自在なターンテーブル３を埋設する。ターンテーブル３の一端部にホルダ４をボルト１８で取り付ける。ホルダ４上方にはシャフト６を回動支点軸としてベース１上面に対して垂直に揺動する切断刃物部７を取付ける。切断刃物部７は、切断刃物８、ハンドル９、切断刃物８の上半部を覆うソーカバー１０、モーター１９で構成されている。
【００１１】
切断刃物部７の切断刃物８外周部には、透明な樹脂製の保護カバー１１が切断刃物部７の回動支点と同じ位置を支点として回動自在にシャフト６に取り付けている。保護カバー１１の切断刃物８外周上の内側には、鉄や銅、アルミなど不燃性の材料となる金属板１２を取付ける。金属板１２の取付けは外観良くするために保護カバー１１を保護カバー１１ａと保護カバー１１ｂに分割し、保護カバー１１ａと保護カバー１１ｂの内側に設けられた溝１３ａ，１３ｂに金属板１２をはさみ込みネジ１４で固定している。
【００１２】
上記構成において、墨線合わせをするときは、ベース１上に被切断材２０をのせ、ハンドル９を下げ保護カバー１１越しに墨線を見て、被切断材２０を左右に移動させながら墨線を切断刃物８の刃先に合わせバイス装置３で被切断材２０を固定する。
【００１３】
ハンドル９を押し下げ切断すると、火花や切屑２１は切断刃物８の外周方向に飛散するが、保護カバー１１の内側の金属板１２に当り、保護カバー１１自体は火花等の熱から保護されるため焼損することはない。
【００１４】
また、切断刃物８などの交換で保護カバー１１を上死点へ回動すると、保護カバー１１に設けられたストッパ部１５がソーカバー１０の端部１０ａに当たり回動が規制される。図４に示すように、保護カバー１１が樹脂製のみの場合、重心位置はＧ１となるが、本発明は保護カバー１１外周部に比重の大きい金属板１２を設けることにより重心Ｇ２となり、Ｇ１よりも反シャフト６側に位置する。よって、切断刃物の交換で保護カバー１１を上死点位置に持ち上げたあと、自重落下で保護カバー１１を元の位置へ下げる際、保護カバー１１の回転モーメントが大きくなり、図５に示すように保護カバー１１とシャフト６の隙間に切屑２１がつまっても、保護カバー１１は元に位置に戻りやすくなる。
【００１５】
他の実施形態として図７，図８に示すように、保護カバー１１を一体成形とし、突部１６を成形したときにできる溝１７に金属板１２をＤ方向から挿入する方法もある。
【００１６】
【発明の効果】
本発明によれば、透明な樹脂製の保護カバーとし、不燃性の材料を保護カバー外周部に設けることで、切断刃物の刃先が見やすくなるとともに、火花や切屑の熱による保護カバーの焼損を防止することができる。
【図面の簡単な説明】
【図１】本発明の実施形態を示す金属用切断機の左側面図。
【図２】図１のＡ−Ａ線断面図。
【図３】図１の正面図。
【図４】保護カバーを上死点へ回動させたときの左側面図。
【図５】図４のＢ−Ｂ線断面図。
【図６】図１で切断時の火花や切屑の飛散状態を示す部分左側面図。
【図７】保護カバーの他の実施形態を示す側面図。
【図８】図７のＣ−Ｃ線断面図。
【符号の説明】
７…切断刃物、１１…保護カバー、１２…金属板。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal cutting machine having a protective cover for a cutting blade .
[0002]
[Prior art]
In conventional metal cutting machines, when cutting a metal workpiece with a cutting saw such as a tip saw or a grindstone, sparks and high-temperature chips are scattered in the outer peripheral direction of the cutting blade. A cover was provided.
[0003]
[Problems to be solved by the invention]
Conventionally, when aligning the cutting edge of the cutting blade with the black line indicating the cutting position marked on the material to be cut, the cutting blade is covered with an iron plate protective cover and the cutting edge cannot be seen. The black line of the material to be cut was matched with the cutting edge.
[0004]
In addition, when a transparent resin protective cover is used so that the black line can be seen without lifting the protective cover, there is a problem that the protective cover is burned out by sparks scattered in the outer peripheral direction of the cutting blade during cutting.
[0005]
Furthermore, after lifting the protective cover to the top dead center position by exchanging the cutting blade, when the protective cover is lowered to the original position, it is dropped by its own weight with the eccentric amount of the center of gravity position with respect to the top dead center position of the protective cover. When exchanging the cutting blade, the protective cover must be raised greatly, so the eccentricity cannot be increased.
[0006]
In the case of a lightweight protective cover made of resin, the position of the center of gravity is G1 close to the pivot point of the protective cover as shown in FIG. As shown in FIG. 5, if chips 21 are clogged at the pivot point of the protective cover, etc., when the protective cover is dropped by its own weight, the rotational moment is small, so the lowering becomes worse and the protective cover stops midway. End up. Therefore, since a part of the cutting blade is exposed from the protective cover, there is a problem that sparks and chips are scattered to the operator side if used as it is.
[0007]
An object of the present invention is to provide a protective cover that does not burn while allowing the cutting edge of the cutting blade to be seen without raising the protective cover. Another object is to increase the rotational force of the protective cover so that the protective cover can be easily lowered.
[0008]
[Means for Solving the Problems]
An object of the present invention is to provide a metal cutting machine having a base portion for placing a material to be cut and a rotatable protective cover that covers a cutting blade and has a substantially arc-shaped outer peripheral portion. And by providing a metal plate along the outer periphery of the outer periphery .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. 1 is a left side view of a metal cutting machine, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a front view of FIG. 1, and FIG. FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 4, and FIG. 6 is a partial left side view showing a state of sparks and chips scattered during cutting.
[0010]
In the figure, a vise device 5 for fixing the material to be cut 20 to the base 1 is provided at the rear of the upper surface of the base 1 while fixing the fence 2 that supports the material to be cut 20. A turntable 3 that is rotatable in the horizontal direction is embedded in the center of the base 1. The holder 4 is attached to one end of the turntable 3 with bolts 18. A cutting blade portion 7 that swings vertically with respect to the upper surface of the base 1 is attached to the upper side of the holder 4 with the shaft 6 as a rotation fulcrum shaft. The cutting blade portion 7 includes a cutting blade 8, a handle 9, a saw cover 10 that covers the upper half of the cutting blade 8, and a motor 19.
[0011]
A transparent resin protective cover 11 is attached to the outer periphery of the cutting blade 8 of the cutting blade 7 on the shaft 6 so as to be rotatable about the same position as the rotation fulcrum of the cutting blade 7. A metal plate 12, which is a nonflammable material such as iron, copper, or aluminum, is attached to the inner side of the protective cover 11 on the outer periphery of the cutting blade 8. In order to improve the appearance of the metal plate 12, the protective cover 11 is divided into a protective cover 11a and a protective cover 11b, and the metal plate 12 is inserted into grooves 13a and 13b provided inside the protective cover 11a and the protective cover 11b. It is fixed with screws 14.
[0012]
In the above configuration, when aligning the black line, the workpiece 20 is placed on the base 1, the handle 9 is lowered, the black line is seen through the protective cover 11, and the black line is cut while moving the workpiece 20 left and right. The material 20 to be cut is fixed by the vise device 3 in accordance with the 8 cutting edges.
[0013]
When the handle 9 is pushed down and cut, sparks and chips 21 scatter in the outer peripheral direction of the cutting blade 8, but hit the metal plate 12 inside the protective cover 11, and the protective cover 11 itself is protected from heat such as sparks and burned out. Never do.
[0014]
Further, when the protective cover 11 is rotated to the top dead center by exchanging the cutting blade 8 or the like, the stopper portion 15 provided on the protective cover 11 hits the end portion 10a of the saw cover 10 and the rotation is restricted. As shown in FIG. 4, when the protective cover 11 is only made of resin, the center of gravity is G1, but the present invention provides the center of gravity G2 by providing a metal plate 12 with a large specific gravity on the outer periphery of the protective cover 11, and the center of gravity is G1. Is also located on the opposite shaft 6 side. Therefore, when the protective cover 11 is lifted to the top dead center position by exchanging the cutting blade, and when the protective cover 11 is lowered to its original position due to falling by its own weight, the rotational moment of the protective cover 11 increases, as shown in FIG. Even if chips 21 are caught in the gap between the protective cover 11 and the shaft 6, the protective cover 11 is easily returned to its original position.
[0015]
As another embodiment, as shown in FIGS. 7 and 8, there is a method in which the protective cover 11 is integrally formed and the metal plate 12 is inserted into the groove 17 formed when the protrusion 16 is formed from the D direction.
[0016]
【The invention's effect】
According to the present invention, a protective cover made of a transparent resin is provided, and a nonflammable material is provided on the outer periphery of the protective cover so that the cutting edge of the cutting blade can be easily seen and the burning of the protective cover due to the heat of sparks and chips is prevented. can do.
[Brief description of the drawings]
FIG. 1 is a left side view of a metal cutting machine showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a front view of FIG. 1;
FIG. 4 is a left side view when the protective cover is rotated to the top dead center.
5 is a cross-sectional view taken along line BB in FIG.
6 is a partial left side view showing a state of sparks and chips scattered during cutting in FIG. 1;
FIG. 7 is a side view showing another embodiment of the protective cover.
8 is a cross-sectional view taken along line CC in FIG.
[Explanation of symbols]
7 ... Cutting blade, 11 ... Protective cover, 12 ... Metal plate.

Claims

A base part on which a material to be cut is placed, a cutting tool part having a cutting tool and swingable with respect to the upper surface of the base, and a rotatable part having a substantially arc-shaped outer periphery covering the cutting tool. in the metal cutting machine having a protective cover, the protective cover and transparent cover, metal cutting machine, characterized in that a metal plate along the outer peripheral portion on the inner side of the outer peripheral portion.

2. The metal cutting machine according to claim 1, wherein the protective cover is divided, and a groove is provided in each protective cover, and the metal plate is sandwiched in the groove.

The metal cutting machine according to claim 1, wherein the base portion includes a turntable connected to the base and the cutting blade portion and rotatable in a horizontal direction with respect to the base.

The metal cutting machine according to any one of claims 1 to 3, wherein the protective cover rotates toward the base portion by its own weight.