JP3973080B2

JP3973080B2 - Method and apparatus for preventing fall of protective fence of press machine

Info

Publication number: JP3973080B2
Application number: JP2002006457A
Authority: JP
Inventors: 洋木下
Original assignee: Komatsu Ltd; Komatsu Industries Corp
Current assignee: Komatsu Ltd; Komatsu Industries Corp
Priority date: 2002-01-15
Filing date: 2002-01-15
Publication date: 2007-09-05
Anticipated expiration: 2022-01-15
Also published as: JP2003205398A

Description

【０００１】
【発明の属する技術分野】
本発明は、プレス機械の作業部に設けられる防護柵を吊下げている吊下索が切れたときにそのまま防護柵が落下するのを防止するプレス機械の防護柵の落下防止方法及びその装置に関するものである。
【０００２】
【従来の技術】
プレス機械の防護柵は、作業域に作業者の立ち入りを拒んだり、加工時のスクラップの作業者側への飛散を防いだりするためにプレス機械の作業部に設置される。したがってプレス機械の稼動時には閉じた状態にしている。そして金型の出し入れ及びプレス内作業等の場合、防護柵が邪魔になるため、これを所定の高さまで上昇して不用意に落下しないように保持できるようになっている。
【０００３】
【発明が解決しようとする課題】
この種の防護柵はチェーン等の吊下索にて吊り下げられており、吊下索を巻き上げたり、巻き下げることより昇降するようになっている。このため、上記吊下索が切れた場合、防護柵がこれの自重で自然に落下し、重大な事故に繋がる恐れがあった。
【０００４】
本発明は上記のことに鑑みなされたもので、仮に防護柵を吊り下げている吊下柵が切れても落下することがなくなり、安全性を向上することができるようにしたプレス機械の防護柵の落下防止方法及びこの方法を実施するための装置を提供することを目的とするものである。
【０００５】
【課題を解決するための手段及び作用効果】
上記目的を達成するために、本発明の請求項１に係るプレス機械の防護柵の落下防止方法は、プレス機械の防護柵の落下防止方法において、プレス機械の防護柵の落下防止装置において、左右のフレームに沿って昇降動可能にした防護柵の中央に上下方向に長くした長穴を設けたブラケットを固着し、このブラケットの長穴に吊り棒を防護柵の幅方向に平行に、かつ長穴に沿って上下方向に移動可能に係合し、また防護柵の両側部に、側方へ突出する方向に付勢された係合部材を設け、左右のフレームに係合部材の先端が係合する被係合部材を上下方向に設け、一方の係合部材と上記吊り棒の一端と、また他方の係合部材と上記吊り棒の他端とを、それぞれ長さ調節可能にすると共に、上記吊り棒が長穴の下端まで下動した状態で係合部材の先端が被係合部材に係合し、上端まで上動した状態で係合部材の先端が被係合部材から抜けるようにした長さにした伝動索にて連結し、上記吊り棒に防護柵を吊り下げる吊下索を連結した構成になっている。
【０００７】
上記した請求項１に係るプレス機械の防護柵の落下防止装置では、吊下索が切れた場合には、防護柵が確実にその位置でフレーム側に係合し、上記吊下索が切断されたときの防護柵落下の危険を回避できるので防護柵としての安全性を向上することができる。
【０００８】
そして上記係合部材は伝動索を介して吊下索に連結されているので、上記のように吊下索だけでなく、伝動索が切断しても係合部材による係止作用がなされる。また、吊下索及び伝動索の端部結合部品等の破損に対しても、係合部材による係止作用がなされる。
【０００９】
また、係合部材による係合機構自体が簡単であることにより、製造コストが安い上に、係合後の回復作業が容易である。
【００１０】
防護柵の大きさが異なる機種間でも、吊下索及び伝動索の長さを変えるだけで、落下防止装置の部品を共通化することができる。
【００１１】
また本発明の請求項２は、上記請求項１に係る構成のプレス機械の防護柵の落下防止装置において、係合部材を少なくとも防護柵の一側部に１個以上設け、係合部材の先端が係合する被係合部材を上下方向に所定の間隔があると共に、防護柵の昇降ストロークの全長にわたって複数並べて設けた構成になっており、この構成によれば、係合部材が一側部に１個だけの場合、構成を簡単にすることができる。また、係合部材の数を一側部に２個以上設けることにより、１個の係合部材が被係合部材に入り損ねても他の係合部材が被係合部材に係合することができて安全性が向上される。また、吊下索あるいは伝動索が防護柵の昇降ストローク上のどこで切れても防護柵の落下を防止できる。
【００１２】
また、本発明の請求項３は、上記請求項１に係る構成のプレス機械の防護柵の落下防止装置において、係合部材を少なくとも防護柵の一側部に上下方向に離間して２個設けると共に、この係合部材の先端が係合する被係合部材を上下方向に所定の間隔があると共に、防護柵の昇降ストロークの全長にわたって複数並べて設け、両係合部材の基端部を連結部材と軸着し、連結部材の略中央部に伝動索を連結した構成になっており、２本設けられた係合部材は連結部材により並列に作動する。また、防護柵の昇降ストローク上のどこで吊下索あるいは伝動索が切れても必ずどこかの係合部材が被係合部材に係合することができるので安全性が向上される。
【００１３】
【発明の実施の形態】
本発明の実施の形態を図面に基づいて説明する。図１は中・大型のプレス機械１を示すもので、２ａ，２ｂは左右（及び前後）のフレーム、３はクラウン、４は基台であり、基台４の上方にスライド（図示せず）が上下動可能に備えてあり、このスライドの上下動により、基台４上にセットした下型装置に対してスライドの下面にセットした上型装置（いずれも図示せず）にてプレス作業がなされるようになっている。
【００１４】
上記基台４の前側（及び後側）に、基台４の作業域と作業者の立つ位置との間に防護柵５が所定のストロークにわたって昇降動可能に設けてある。この防護柵５は、クラウン３側に吊り下げ状に設けた巻き上げ機６にチェーンを用いた吊下索７を介して連結されていて、巻き上げ機６の作動にて吊下索７を介して昇降動されるようになっている。
【００１５】
図２は防護柵５を裏側（作業域側）から見た図であり、防護柵５の両側部のそれぞれの上下部にガイド片８が固着されていて、この各ガイド片８がフレーム２ａ，２ｂの内側面に設けたレール溝９ａ，９ｂに上下方向に摺動可能に係合されている。また、この防護柵５の両側部の下部に、防護柵５をフレーム２ａ，２ｂに下降方向に係脱可能に係合する係合装置１０ａ，１０ｂがフレーム２ａ，２ｂの内面に対向させて設けてある。
【００１６】
係合装置１０ａ，１０ｂは、図４にて拡大して示すように、防護柵５に固着した案内ブロック１１と、この案内ブロック１１を水平方向に貫通し、かつ弾性体、例えばばね１２によりフレーム２ａ，２ｂ側へ付勢されて嵌合された係合部材である２本のストッパピン１３，１３と、この２本のストッパピン１３，１３の基端部と軸着した連結部材１４とからなっている。なお、軸着部の嵌め合いは適宜ゆるく、例えば下側のストッパピンのみが突出動した場合でも連結部材１４が傾くことが許容されるようになっている。
【００１７】
上記ストッパピン１３は、これの先端が防護柵５の側面より所定寸法突出する位置から防護柵５の側面の内側へ没入する位置にわたってストロークするようになっている。またこのストッパピン１３の先端は、太さの略１／２の上側が斜面状に切り欠かれている。
【００１８】
フレーム２の内側面で、かつ上記係合装置１０ａ，１０ｂのストッパピン１３が対向する位置には係合部材であるストッパピン１３の先端部が係合する被係合部材としての係合凹部１５が上下方向に防護柵５の昇降ストロークの全長にわたって複数個設けてある。この各係合凹部１５は長溝状になっている。
【００１９】
係合凹部１５は、図５（ａ），（ｂ）に示すように、板材１６に設け、これをフレーム２ａ，２ｂの内側面にボルト等にて固着するか、あるいは図６（ａ），（ｂ）に示すように、係合凹部１５をＵ字状に設けた多数の板片１７を上下方向に所定の数だけボルト等にて固着するようにしてもよい。図４では板片１７の例を示している。なおこの各板片１７に設ける係合凹部１５はＵ字状に限ることなく長溝状にしてもよい。この実施の形態によれば、板片１７の増減により係合凹部１５の数を上下方向に任意に変えることができる。また、板材１６または板片１７は前記レール溝９ａ，９ｂと重ならないように配置してある。
【００２０】
防護柵５の裏側の上部中央にブラケット１８が固着してあり、このブラケット１８に設けられた上下方向に長くした長穴１８ａに吊り棒１９が防護柵５の幅方向平行に、かつ上下方向に移動可能に係合されている。そしてこの吊り棒１９の両端部のそれぞれに同一長さのチェーンを用いた伝動索２０ａ，２０ｂの一端が連結されており、図２に示すように、左側の伝動索２０ａはガイドスプロケット２１ａ，２２ａを介して左側の係合装置１０ａの連結部材１４の中間部に、また、右側の伝動索２０ｂはガイドスプロケット２１ｂ，２２ｂを介して右側の係合装置１０ｂの連結部材１４の中間部に、それぞれ連結されている。なお各伝動索２０ａ，２０ｂの途中にはターンバックル２３ａ，２３ｂが介装してあり、これにより長さが調節できるようになっている。
【００２１】
伝動索２０ａ，２０ｂの長さは、吊り棒１９がブラケット１８に対して上限まで移動した状態で、伝動索２０ａ，２０ｂを介して引かれるストッパピン１３，１３がばね（弾性体）１２に抗して、これの先端が係合凹部１５から抜けるようにした長さになっている。なお、吊り棒１９の上下方向のストロークはストッパピン１３のストロークより十分長くなっている。
【００２２】
吊り棒１９は吊り部材２４を介して吊下索７に連結されている。吊り部材２４は、吊り棒１９が水平状態を維持した状態で上下動するように、吊り棒１９の両側部で連結されている。
【００２３】
上記した係合装置１０ａ，１０ｂにおけるストッパピン１３，１３を突出方向に付勢する１個ずつのばね（弾性体）１２の付勢力は、防護柵５の重量の１／４より小さくなっている。しかしながらストッパピン１３を突出動作させるには十分な付勢力を有している。
【００２４】
上記構成において、防護柵５は巻き上げ機６にて、吊下索７、吊り部材２４、吊り棒１９、ブラケット１８を介して吊り下げ保持される。このとき、防護柵５の全重量が、係合装置１０ａ，１０ｂのストッパピン１３を突出させるためのばね（弾性体）１２の付勢力より大きいことにより、ストッパピン１３に連結した伝動索２０ａ，２０ｂの基端を連結した吊り棒１９はブラケット１８の長穴１８ａの上端まで移動し、防護柵５はこの吊り棒１９がブラケット１８に係合することにより吊り下げられる。
【００２５】
この状態で、係合装置１０ａ，１０ｂのストッパピン１３，１３はばね（弾性体）１２に抗して伝動索２０ａ，２０ｂにて引っぱられて没入され、これの先端がフレーム２ａ，２ｂの内側に設けられた係合凹部１５から離隔された状態となり、ストッパピン１３の先端は係合凹部１５とは干渉せず、防護柵５は巻き上げ機６の作動により昇降動される。そして作業域での作業者の立ち入り作業時には巻き上げ機６を操作して防護柵５を上昇限まで上昇させた状態で保持し、プレス作業時には巻き上げ機６を下降操作して防護柵５をこれの下降限まで下降させる。
【００２６】
上記防護柵５の上昇時において、吊下索７または伝動索２０ａ，２０ｂが切断すると防護柵５は自然落下する。このとき、吊り下げ力による張力がなくなるため、係合装置１０ａ，１０ｂのストッパピン１３と吊り棒１９を連結する伝動索２０ａ，２０ｂの張力もなくなり、各ストッパピン１３はばね（弾性体）１２により突出動作され、防護柵５の側方へ突出し、これの先端がフレーム２ａ，２ｂの内側面に設けた係合凹部１５に係合して防護柵５の落下が停止される。
【００２７】
このとき、係合凹部１５が上下方向に複数個あることにより、防護柵５の落下中にいずれか１つの係合凹部１５にストッパピン１３が係合し、短い落下ストロークで防護柵５が停止される。また、上記係合凹部１５が上下方向に長穴にしたこと、及びストッパピン１３の先端の上側を斜面状に切り欠いたことにより、係合凹部１５へのストッパピン１３の係合はスムーズに短時間に行われる。
【００２８】
なお、ストッパピン１３の先端を小さくすることにより、係合凹部１５の形状を丸穴状にしてもよく、さらにラック歯車状にギザギザにした形状であってもよい。また、ストッパピン１３の数も、２本に限らず１本でもよく、さらに係合凹部との係合がより確実にするために２本以上設けてもよい。吊下索７及び伝動索２０ａ，２０ｂはそれぞれチェーンを用いた例を示したが、これはワイヤに置き換えてもよいもちろんである。
【００２９】
さらに、係合装置１０ａ，１０ｂの係合部材は軸方向に摺動するストッパピン１３の形状に限るものでなく、ベルクランク形状にし、これが回動することにより、これの先端が被係合部材に係脱するようにしてもよい。
【００３０】
また上記した実施の形態では係合装置１０ａ，１０ｂを防護柵５の両側に設けた例を示したが、これは左右のどちらか一方に設けてもよい。この場合、吊下索７と吊り棒１９及び１本の伝動索の位置は左右方向のバランスをとって配置する。
【図面の簡単な説明】
【図１】本発明を適用しようとするプレス機械を概略的に示す正面図である。
【図２】本発明を適用した防護柵を示す裏側図である。
【図３】図２のＡ−Ａ線に沿う断面矢視図である。
【図４】係合装置を示す拡大断面図である。
【図５】（ａ）は係合凹部を示す正面図、（ｂ）はその断面図である。
【図６】（ａ）は係合凹部の他例を示す正面図、（ｂ）はその断面図である。
【符号の説明】
１…プレス機械、２ａ，２ｂ…フレーム、３…クラウン、４…基台、５…防護柵、６…巻き上げ機、７…吊下索、８…ガイド片、９ａ，９ｂ…レール溝、１０ａ，１０ｂ…係合装置、１１…案内ブロック、１２…ばね（弾性体）、１３…ストッパピン、１４…連結部材、１５…係合凹部、１６…板材、１７…板片、１８…ブラケット、１８ａ…長穴、１９…吊り棒、２０ａ、２０ｂ…伝動索、２１ａ，２１ｂ，２２ａ，２２ｂ…ガイドスプロケット、２３ａ，２３ｂ…ターンバックル、２４…吊り部材。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fall prevention method and apparatus for a protective fence of a press machine that prevents the protective fence from dropping as it is when a hanging rope that suspends a protective fence provided in a working part of a press machine is cut. Is.
[0002]
[Prior art]
The protective fence of the press machine is installed in the working part of the press machine in order to prevent the worker from entering the work area or prevent the scrap from being scattered to the worker side during processing. Therefore, it is in a closed state when the press machine is in operation. In the case of taking in and out of the mold and working in the press, the protective fence becomes an obstacle, so that the fence can be raised to a predetermined height and can be held so as not to fall inadvertently.
[0003]
[Problems to be solved by the invention]
This type of protective fence is suspended by a suspension rope such as a chain, and is lifted or lowered by winding up or down the suspension rope. For this reason, when the above-mentioned suspension cable is cut, the protective fence naturally falls by its own weight, which may lead to a serious accident.
[0004]
The present invention has been made in view of the above, and even if a suspended fence that suspends the protective fence is cut, it does not fall, and the protective fence of the press machine can be improved in safety. An object of the present invention is to provide a fall prevention method and an apparatus for carrying out this method.
[0005]
[Means for solving the problems and effects]
To achieve the above object, drop prevention method for fences of a press machine according to claim 1 of the present invention, the fall prevention method fences of the press machine, the fall prevention device of fences of the press machine, left and right A bracket with a long slot that is elongated in the vertical direction is fixed to the center of the protective fence that can be moved up and down along the frame of the frame, and a suspension rod is attached to the long hole of this bracket in parallel with the width direction of the protective fence. Engagement members that are movable in the vertical direction along the holes are provided, and engagement members that are urged in the direction of protruding sideways are provided on both sides of the protective fence, and the distal ends of the engagement members are engaged with the left and right frames. The engaging members to be combined are provided in the vertical direction, and one of the engaging members and one end of the suspension rod, and the other engagement member and the other end of the suspension rod are adjustable in length, With the suspension rod moved down to the lower end of the slot, The end is engaged with the member to be engaged, and is connected to the suspension rod by a transmission line having such a length that the tip of the engaging member is removed from the member to be engaged with the upper end moved upward. It is the structure which connected the suspension cable which suspends .
[0007]
In the protective fence fall prevention device for a press machine according to claim 1 described above, when the suspended rope is cut, the protective fence is surely engaged with the frame side at that position, and the suspended rope is cut. can be avoided the danger of guard fence falling can be improved safety as the safety barrier when the.
[0008]
And since the said engagement member is connected with the suspension cable via the transmission line, even if not only the suspension line as mentioned above but a transmission line cut | disconnects, the latching effect by an engagement member is made | formed. In addition, the engaging member can be locked against damage to the end coupling parts of the suspension cable and the transmission cable.
[0009]
Further, since the engagement mechanism itself by the engagement member is simple, the manufacturing cost is low and the recovery work after engagement is easy.
[0010]
Even among models with different sizes of protective fences, the parts of the fall prevention device can be shared by simply changing the lengths of the suspension cable and the transmission cable.
[0011]
According to a second aspect of the present invention, in the protective fence fall prevention device for a press machine having the configuration according to the first aspect , at least one engagement member is provided on one side of the protection fence, and the tip of the engagement member is provided. The engaged members to be engaged with each other have a predetermined interval in the vertical direction, and are arranged side by side over the entire length of the lifting / lowering stroke of the guard fence. If there is only one, the configuration can be simplified. Further, by providing two or more engaging members on one side, even if one engaging member fails to enter the engaged member, the other engaging member engages with the engaged member. To improve safety. In addition, it is possible to prevent the protective fence from falling no matter where the suspended cable or the transmission cable breaks on the lifting stroke of the protective fence.
[0012]
Further, Claim 3 of the present invention is the anti-drop device for fences press machine configuration according to the claim 1, provided two spaced apart vertically on one side of at least the safety barrier engaging member In addition, the engaged members with which the distal ends of the engaging members are engaged have a predetermined interval in the vertical direction and are arranged side by side over the entire length of the lifting / lowering stroke of the protective fence, and the base ends of both engaging members are connected to each other. The transmission line is connected to the substantially central portion of the connecting member, and the two engaging members are operated in parallel by the connecting member. In addition, any engagement member can always engage with the engaged member regardless of where the suspension or transmission line is cut off on the lifting / lowering stroke of the protective fence, so that safety is improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a medium / large press machine 1, 2 a and 2 b are left and right (and front and rear) frames, 3 is a crown, 4 is a base, and slides above the base 4 (not shown). Can be moved up and down, and by this vertical movement of the slide, the lower mold device set on the base 4 is pressed by an upper mold device (none of which is shown) set on the lower surface of the slide. It has been made.
[0014]
On the front side (and the rear side) of the base 4, a protective fence 5 is provided between a work area of the base 4 and a position where an operator stands so as to be movable up and down over a predetermined stroke. The protective fence 5 is connected to a hoisting machine 6 provided in a suspended form on the crown 3 side via a hoisting rope 7 using a chain, and the hoisting machine 6 operates the hoisting rope 7 via the hoisting rope 7. It can be moved up and down.
[0015]
FIG. 2 is a view of the protective fence 5 as viewed from the back side (working area side). Guide pieces 8 are fixed to the upper and lower portions of both sides of the protective fence 5, and each guide piece 8 is attached to the frame 2a, The rail grooves 9a and 9b provided on the inner surface of 2b are engaged with each other so as to be slidable in the vertical direction. Further, engaging devices 10a and 10b for engaging the guard fence 5 with the frames 2a and 2b so as to be detachable in the downward direction are provided at the lower portions of both sides of the guard fence 5 so as to face the inner surfaces of the frames 2a and 2b. It is.
[0016]
As shown in an enlarged view in FIG. 4, the engaging devices 10 a and 10 b include a guide block 11 fixed to the protective fence 5, a horizontal passage through the guide block 11, and an elastic body such as a spring 12 that 2 stopper pins 13 and 13 which are engaging members urged and fitted to the 2a and 2b sides, and a connecting member 14 which is pivotally attached to the base ends of the two stopper pins 13 and 13 It has become. In addition, the fitting of the shaft attachment portion is appropriately loose, and for example, even when only the lower stopper pin protrudes, the connecting member 14 is allowed to tilt.
[0017]
The stopper pin 13 strokes from the position where the tip of the stopper pin 13 protrudes by a predetermined dimension from the side surface of the protective fence 5 to the position where the stopper pin 13 enters the inside of the side surface of the protective fence 5. Further, the tip of the stopper pin 13 is notched in an inclined shape on the upper side of about 1/2 of the thickness.
[0018]
An engaging recess 15 as an engaged member with which the front end portion of the stopper pin 13 as an engaging member engages with the inner surface of the frame 2 and the position where the stopper pin 13 of the engaging devices 10a and 10b opposes. Are provided in the vertical direction over the entire length of the lifting / lowering stroke of the protective fence 5. Each engaging recess 15 has a long groove shape.
[0019]
As shown in FIGS. 5 (a) and 5 (b), the engaging recess 15 is provided on the plate 16 and is fixed to the inner side surfaces of the frames 2a and 2b with bolts or the like. As shown in (b), a large number of plate pieces 17 provided with engaging recesses 15 in a U shape may be fixed in a vertical direction by a predetermined number of bolts or the like. FIG. 4 shows an example of the plate piece 17. Note that the engagement recess 15 provided in each plate piece 17 is not limited to a U-shape but may be a long groove. According to this embodiment, the number of engaging recesses 15 can be arbitrarily changed in the vertical direction by increasing or decreasing the number of plate pieces 17. Further, the plate member 16 or the plate piece 17 is arranged so as not to overlap the rail grooves 9a, 9b.
[0020]
A bracket 18 is fixed to the upper center of the back side of the protective fence 5, and a suspension rod 19 is parallel to the width direction of the protective fence 5 and vertically in a long hole 18 a provided in the bracket 18 that is elongated in the vertical direction. It is movably engaged. Then, one end of a transmission line 20a, 20b using a chain of the same length is connected to each of both ends of the suspension bar 19, and as shown in FIG. 2, the transmission line 20a on the left side is a guide sprocket 21a, 22a. The right transmission cable 20b is connected to the intermediate portion of the connecting member 14 of the right engaging device 10b via the guide sprockets 21b and 22b, respectively. It is connected. In addition, turnbuckles 23a and 23b are interposed in the middle of the transmission lines 20a and 20b, so that the length can be adjusted.
[0021]
The lengths of the transmission lines 20 a and 20 b are such that the stopper pins 13 and 13 pulled through the transmission lines 20 a and 20 b resist the spring (elastic body) 12 in a state where the suspension bar 19 has moved to the upper limit with respect to the bracket 18. Thus, the length is such that the tip of the tip is removed from the engagement recess 15. The vertical stroke of the suspension bar 19 is sufficiently longer than the stroke of the stopper pin 13.
[0022]
The suspension bar 19 is connected to the suspension cable 7 through a suspension member 24. The suspension member 24 is connected to both sides of the suspension bar 19 so that the suspension bar 19 moves up and down while maintaining a horizontal state.
[0023]
The urging force of each spring (elastic body) 12 that urges the stopper pins 13 and 13 in the protruding direction in the engagement devices 10a and 10b described above is smaller than ¼ of the weight of the protective fence 5. . However, it has a sufficient urging force to cause the stopper pin 13 to project.
[0024]
In the above configuration, the protective fence 5 is suspended and held by the hoisting machine 6 through the suspension rope 7, the suspension member 24, the suspension rod 19, and the bracket 18. At this time, since the total weight of the protective fence 5 is larger than the urging force of the spring (elastic body) 12 for projecting the stopper pin 13 of the engagement devices 10a and 10b, the transmission cable 20a connected to the stopper pin 13 The suspension rod 19 connected to the base end of 20b moves to the upper end of the long hole 18a of the bracket 18, and the protective fence 5 is suspended by engaging the suspension rod 19 with the bracket 18.
[0025]
In this state, the stopper pins 13 and 13 of the engagement devices 10a and 10b are pulled and immersed by the transmission lines 20a and 20b against the springs (elastic bodies) 12, and the tips thereof are inside the frames 2a and 2b. The tip of the stopper pin 13 does not interfere with the engaging recess 15 and the protective fence 5 is moved up and down by the operation of the hoisting machine 6. When the operator enters the work area, the hoisting machine 6 is operated to hold the protective fence 5 in the raised state, and during the press work, the hoisting machine 6 is lowered to remove the protective fence 5. Lower to the lower limit.
[0026]
When the protective fence 5 is raised, the protective fence 5 naturally falls when the suspension cable 7 or the transmission cables 20a and 20b are cut. At this time, since the tension due to the suspending force is eliminated, the tension of the transmission lines 20a and 20b connecting the stopper pins 13 and the suspension rods 19 of the engagement devices 10a and 10b is also eliminated. , Projecting to the side of the protective fence 5, the tip of which engages with the engagement recess 15 provided on the inner surface of the frame 2a, 2b, and the fall of the protective fence 5 is stopped.
[0027]
At this time, since there are a plurality of engaging recesses 15 in the vertical direction, the stopper pin 13 is engaged with any one of the engaging recesses 15 while the protective fence 5 is dropped, and the protective fence 5 stops with a short dropping stroke. Is done. Further, the engagement recess 15 is formed into a long hole in the vertical direction, and the upper side of the tip of the stopper pin 13 is notched in a slope shape, so that the stopper pin 13 is smoothly engaged with the engagement recess 15. It takes a short time.
[0028]
In addition, by making the tip of the stopper pin 13 small, the shape of the engagement concave portion 15 may be a round hole shape, or may be a shape that is jagged like a rack gear. Further, the number of stopper pins 13 is not limited to two, but may be one, and two or more stopper pins 13 may be provided in order to make the engagement with the engaging recess more reliable. Although the suspension cable 7 and the transmission cables 20a and 20b have shown examples using chains, it is needless to say that they may be replaced with wires.
[0029]
Further, the engaging members of the engaging devices 10a and 10b are not limited to the shape of the stopper pin 13 that slides in the axial direction, but are formed into a bell crank shape, and when this is rotated, the tip of the engaging pin is engaged. You may make it disengage from.
[0030]
Further, in the above-described embodiment, the example in which the engagement devices 10a and 10b are provided on both sides of the protective fence 5 is shown, but this may be provided on either the left or right side. In this case, the positions of the suspension rope 7, the suspension rod 19, and one transmission line are arranged with a balance in the left-right direction.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a press machine to which the present invention is applied.
FIG. 2 is a back side view showing a protective fence to which the present invention is applied.
3 is a cross-sectional arrow view taken along the line AA in FIG. 2;
FIG. 4 is an enlarged sectional view showing an engagement device.
5A is a front view showing an engaging recess, and FIG. 5B is a cross-sectional view thereof.
6A is a front view showing another example of the engaging recess, and FIG. 6B is a cross-sectional view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Press machine, 2a, 2b ... Frame, 3 ... Crown, 4 ... Base, 5 ... Guard fence, 6 ... Hoisting machine, 7 ... Suspension rope, 8 ... Guide piece, 9a, 9b ... Rail groove, 10a, DESCRIPTION OF SYMBOLS 10b ... Engagement device, 11 ... Guide block, 12 ... Spring (elastic body), 13 ... Stopper pin, 14 ... Connection member, 15 ... Engagement recessed part, 16 ... Plate material, 17 ... Plate piece, 18 ... Bracket, 18a ... Long hole, 19 ... suspension rod, 20a, 20b ... transmission line, 21a, 21b, 22a, 22b ... guide sprocket, 23a, 23b ... turnbuckle, 24 ... suspension member.

Claims

In the fall prevention device of the protective fence of the press machine,
A bracket (18) provided with a long hole (18a) elongated in the vertical direction is fixed to the center of the protective fence (5) that can be moved up and down along the left and right frames,
A suspension rod (19) is engaged with the elongated hole (18a) of the bracket (18) in parallel with the width direction of the protective fence (5) and movably in the vertical direction along the elongated hole (18a).
Moreover, the engagement member urged | biased in the direction which protrudes to a side is provided in the both sides of a protective fence (5),
An engaged member that engages the distal end of the engaging member with the left and right frames is provided in the vertical direction,
The length of one engagement member and one end of the suspension rod (19), and the other engagement member and the other end of the suspension rod (19) are adjustable, and the suspension rod (19). So that the tip of the engaging member engages with the engaged member in a state where it moves down to the lower end of the long hole (18a), and the tip of the engaging member comes out of the engaged member in a state where it moves up to the upper end. Connected with the length of the transmission cable (23a, 23b),
A device for preventing fall of a protective fence, wherein a suspension cable for suspending a protective fence (5) is connected to the suspension rod (19) .

At least one engagement member is provided on one side of the protective fence (5), and the engaged member with which the tip of the engagement member engages has a predetermined interval in the vertical direction,
The apparatus according to claim 2, wherein a plurality of the fences are arranged side by side over the entire length of the lifting / lowering stroke of the guard fence.

Two engaging members are provided at least on one side of the protective fence (5) so as to be spaced apart in the vertical direction, and the members to be engaged with which the tips of the engaging members are engaged have a predetermined interval in the vertical direction. The guard fence (5) is provided side by side over the entire length of the lifting stroke, the base ends of both engaging members are attached to the connecting member (14), and the transmission cable is connected to the substantially central portion of the connecting member (14). The fall prevention device for a protective fence of a press machine according to claim 2.