JP2010158700A - Return mechanism for cam device - Google Patents

Return mechanism for cam device Download PDF

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JP2010158700A
JP2010158700A JP2009002344A JP2009002344A JP2010158700A JP 2010158700 A JP2010158700 A JP 2010158700A JP 2009002344 A JP2009002344 A JP 2009002344A JP 2009002344 A JP2009002344 A JP 2009002344A JP 2010158700 A JP2010158700 A JP 2010158700A
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cam
coil spring
coil
spring
return mechanism
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Hiromi Takahashi
弘実 高橋
Nobuyuki Kobayashi
伸之 小林
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Sankyo Oilless Industries Inc
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Sankyo Oilless Industries Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a return mechanism for a cam device which is compact and is easy to assemble. <P>SOLUTION: In the return mechanism 1 for the cam device, a cam slider 3 in a cam device advances so as to resist the energizing force of a returning coil spring 6, to compress the spring and to work a workpiece, and is then returned by the energizing force of the compressed coil spring to the original position. The returning coil spring includes two coil springs 7a, 7b that are different from each other in allowable load and are provided in series between a spring storage space 3b located at the lower part of the cam slider and a sidewall surface 2a which faces an opening on one end side of the spring storage space in a cam base sidewall part 2b that slides and supports the cam slider. The two coil springs are different from each other in coil diameter, and the front end of one of the coil springs enters the inside of the other coil spring from the opening on the one end side so that a part of one of the coil springs overlaps with a part of the other coil spring. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、板金等のパネルをプレス成形するプレス金型におけるカム装置の戻し機構に係り、パネル等の端部を穴明け若しくは曲げ加工するカム装置のスライダーを、加工作用後に元の位置に戻す弾性部材の戻し機構に関するものである。   The present invention relates to a cam device return mechanism in a press die for press-molding a panel such as a sheet metal, and returns a slider of a cam device for drilling or bending an end of the panel or the like to its original position after a processing operation. The present invention relates to an elastic member return mechanism.

従来、カム装置の戻し機構は、例えば、図５に示すように、許容荷重の相違する複数種類のコイルバネを直列に並べて、圧縮方向に外力を加えて圧縮するとき、許容荷重の大きいコイルバネを除くコイルバネの圧縮される撓み量を独自に規制して、その規制された撓み量までしか圧縮されないようにし、プレス動作時に、許容荷重の小さいコイルバネから許容荷重の最も大きいコイルバネかで順に圧縮させて、許容荷重の最も大きいコイルバネの圧縮でプレス動作が完了するようにし、プレス動作完了後に、許容荷重の大きなコイルバネから順に伸長させてカム戻し動作をさせるようにした、カム戻しばね装置が知られている。
特開２００１−３２１８５５号公報 2. Description of the Related Art Conventionally, as shown in FIG. 5, for example, a return mechanism of a cam device removes a coil spring having a large allowable load when a plurality of types of coil springs having different allowable loads are arranged in series and compressed by applying an external force in the compression direction. The amount of deflection of the coil spring is restricted independently, and only the amount of deflection that is restricted is compressed, and during the press operation, the coil spring having the largest allowable load is compressed in order from the coil spring having the smallest allowable load, 2. Description of the Related Art A cam return spring device is known in which a press operation is completed by compression of a coil spring having the largest allowable load, and after the press operation is completed, a cam return operation is performed by sequentially extending from the coil spring having a large allowable load. .
JP 2001-321855 A

しかし、従来のカム装置の戻し機構においては、許容荷重の相違するコイルバネが直列に配置されているので、これを収容するカムベースにおける戻し機構部の軸線方向（カムスライダーの往復移動方向）における長さが長くなり、カム装置全体の大きさが大きくなってしまう。また、コイルバネをガイドするガイドピンがカムベース側にも必要になると、カムベースとカムスライダーとの組立においても、作業工数が増えて複雑化することになるという課題がある。またコイルバネが直列に配置されているために、カムのストロークエンドで得られるカムの戻し力が１つのコイルバネの圧縮力により決まり、戻し力をより大きくすることが困難であった。本発明に係るカム装置の戻し機構は、このような課題を解決するために提案されたものである。   However, in the return mechanism of the conventional cam device, since the coil springs having different allowable loads are arranged in series, the length in the axial direction (the reciprocating direction of the cam slider) of the return mechanism portion in the cam base that accommodates the coil spring. Becomes longer, and the overall size of the cam device becomes larger. In addition, if a guide pin for guiding the coil spring is also required on the cam base side, there is a problem in that the number of work steps increases in the assembly of the cam base and the cam slider. Since the coil springs are arranged in series, the cam return force obtained at the stroke end of the cam is determined by the compression force of one coil spring, and it is difficult to increase the return force. The cam device return mechanism according to the present invention has been proposed in order to solve such problems.

本発明に係るカム装置の戻し機構の上記課題を解決して目的を達成するための要旨は、
カム装置におけるカムスライダーが戻し用コイルバネの付勢力に抗して圧縮しワークに加工するように前進して、その後、前記圧縮されたコイルバネの付勢力で元の位置に戻る戻し機構において、前記戻し用コイルバネが、前記カムスライダー下部のバネ収容空間と前記カムスライダーを摺動させ支持するカムベースの側壁部における前記バネ収容空間の一端側開口部に対向する側壁面との間に直列配列にして設けられる許容荷重の異なる二つのコイルバネからなり、前記二つのコイルバネは、そのコイル直径が異なっていて一方のコイルバネの先端部が他方のコイルバネの一端側開口部から内側に入り込んでコイルバネの一部が重複して配設されていることである。 The gist for solving the above-mentioned problems of the return mechanism of the cam device according to the present invention is as follows.
In the return mechanism, the cam slider in the cam device is compressed against the urging force of the return coil spring so as to be processed into a workpiece, and then returned to the original position by the urging force of the compressed coil spring. Coil springs are provided in a series arrangement between a spring accommodating space below the cam slider and a side wall facing the one end side opening of the spring accommodating space in the side wall of the cam base that slides and supports the cam slider. The two coil springs have different coil diameters, the coil diameters of which are different, and the tip of one coil spring enters the inside from the opening on one end side of the other coil spring, so that part of the coil spring overlaps It is arranged as.

前記一方のコイルバネと他方のコイルバネとの間には、一端開口の筒体の底部と、該筒体の前記一端開口部に設けられたフランジ部とで、前記両コイルバネの押圧力を伝達する筒状の伝達部材が設けられていることを含み、
前記カムスライダーのバネ収容空間に取り付けられるコイルバネ用のガイド棒における長手方向の長さと、細長い伝達部材における長手方向の長さとは、これらの両コイルバネが縮小される押圧工程の途中で前記ガイド棒の先端と前記伝達部材の底板の表面とが当接して前記両コイルバネのいずれかを押圧するように設定されていることを含むものである。 A cylinder that transmits the pressing force of the two coil springs between the one coil spring and the other coil spring by a bottom portion of the cylindrical body having an opening at one end and a flange portion provided at the one end opening of the cylindrical body. Including a transmission member having a shape,
The length in the longitudinal direction of the guide rod for the coil spring attached to the spring accommodating space of the cam slider and the length in the longitudinal direction of the elongated transmission member are determined in the course of the pressing process in which both the coil springs are reduced. It is set that the front end and the surface of the bottom plate of the transmission member are in contact with each other and press either one of the two coil springs.

本発明のカム装置の戻し機構によれば、複数個のコイルバネを使用した場合でも、その全体の長さを短くすることが出来るようになり、コンパクトにできて、コストの低減が図られ、組立作業も容易になる。またコイルバネの力を列として利用できるためにカムの戻し力をより大きく設定できる。   According to the return mechanism of the cam device of the present invention, even when a plurality of coil springs are used, the overall length thereof can be shortened, the size can be reduced, and the cost can be reduced. Work becomes easy. Further, since the force of the coil spring can be used as a row, the return force of the cam can be set larger.

本発明に係るカム装置の戻し機構１は、図１に示すように、プレス金型の下ダイに固定されるカムベース２と、このカムベース２に摺動支持されるカムスライダー３と、該カムスライダー３を所定の方向に直進させるカム面４ａを有して上ダイに固定されて上下方向に昇降されるカムドライバー４とからなるカム装置５において、前記カムスライダー３が戻し用コイルバネ６の付勢力に抗して圧縮しワーク（図示せず）に加工するように前進して、その後、前記圧縮されたコイルバネ６の付勢力で元の位置に戻すための機構である。   As shown in FIG. 1, a cam device return mechanism 1 according to the present invention includes a cam base 2 fixed to a lower die of a press die, a cam slider 3 slidably supported by the cam base 2, and the cam slider. In a cam device 5 comprising a cam driver 4 having a cam surface 4a for moving 3 straight in a predetermined direction and being fixed to the upper die and moved up and down in the vertical direction, the cam slider 3 is biased by a return coil spring 6 It is a mechanism for proceeding to compress the workpiece against a workpiece and processing it into a workpiece (not shown) and then returning it to the original position by the urging force of the compressed coil spring 6.

前記カムスライダー３の前面には、工具取付面３ａがあり、下部にはバネ収納空間を形成するバネ収容部３ｂが在る。このカムスライダー３は、カムベース２に一端を嵌合穴に差し込んで他端をボルト２ｃで固定される棒状のガイド部材２ｂによってガイドされている。   The cam slider 3 has a tool mounting surface 3a on the front surface, and a spring housing portion 3b that forms a spring housing space on the bottom. The cam slider 3 is guided to a cam base 2 by a rod-shaped guide member 2b having one end inserted into a fitting hole and the other end fixed by a bolt 2c.

前記戻し用コイルバネ６が、前記カムスライダー下部のバネ収容空間と前記カムスライダー３を摺動させ支持するカムベース２の側壁部２ｄにおける前記バネ収容空間の一端側開口部に対向する側壁面２ａとの間に直列配列にして設けられる許容荷重の異なる二つのコイルバネ７ａ，７ｂからなる。   The return coil spring 6 is formed between the spring housing space below the cam slider and the side wall surface 2a facing the one end side opening of the spring housing space in the side wall 2d of the cam base 2 that slides and supports the cam slider 3. It consists of two coil springs 7a and 7b with different allowable loads provided in series.

前記二つのコイルバネ７ａ，７ｂは、そのコイル直径が異なっていて、その自由長およびバネ定数ｋも異なっている。そして、図１に図示するように、コイル直径が小さくてバネ定数の大きい一方のコイルバネ７ｂの先端部が、コイル直径が大きくバネ定数の小さい他方のコイルバネ７ａの一端側開口部から内側に入り込んで、これらのコイルバネ７ａ，７ｂの一部が重複して配設されている。   The two coil springs 7a and 7b have different coil diameters and different free lengths and spring constants k. Then, as shown in FIG. 1, the tip of one coil spring 7b having a small coil diameter and a large spring constant enters inside from one end opening of the other coil spring 7a having a large coil diameter and a small spring constant. These coil springs 7a and 7b are partially overlapped.

前記コイルバネ７ａ，７ｂがカムスライダー３が往復移動する前後方向に沿って、重複させて配設されることで、単純に直列にして配設する場合に比べて、その全体長さが短くなる。よって、前記カムベース２の側壁部２ｄの位置も前後方向において近くに配置でき、前記バネ収容空間を形成するバネ収容部３ｂも、前後方向の長さを短くしてコンパクトにできる。   The coil springs 7a and 7b are disposed so as to overlap each other in the front-rear direction in which the cam slider 3 reciprocates, so that the overall length thereof is shortened as compared with the case where the coil springs 7a and 7b are simply disposed in series. Therefore, the position of the side wall portion 2d of the cam base 2 can be arranged close in the front-rear direction, and the spring housing portion 3b forming the spring housing space can be made compact by shortening the length in the front-rear direction.

図１に示す実施例では、コイルバネ７ａが、バネ定数の小さい弱いバネであり、コイルバネ７ｂがバネ定数の大きい強いバネである。このように設定したのは、カムスライダー３が前進し始める際には負荷が強くならないように軽負荷にし、下死点近くで、強いバネのコイルバネ７ｂを押し込んで工具でパネルなどを穴加工し、その後、カムドライバー４が下死点から上昇した際に、前記強いバネのコイルバネ７ｂの付勢力で、工具をパネルから確実に引き抜き、工具の引っかかり抵抗に負けないようにして、カムスライダー３が確実に戻るようにするためである。また、コイル直径の大きい方をバネ定数の弱いコイルバネにすることで、構造的にも設計的にも安定するからである。   In the embodiment shown in FIG. 1, the coil spring 7a is a weak spring having a small spring constant, and the coil spring 7b is a strong spring having a large spring constant. The reason for this is that when the cam slider 3 starts to move forward, the load is light so that the load does not become strong, and the coil spring 7b of a strong spring is pushed in near the bottom dead center and the panel is drilled with a tool. After that, when the cam driver 4 is lifted from the bottom dead center, the urging force of the coil spring 7b of the strong spring ensures that the tool is pulled out from the panel so that the cam slider 3 is not defeated by the catching resistance of the tool. This is to ensure that it returns. In addition, by making the coil having a larger coil diameter a coil spring having a weak spring constant, the structure and the design are stabilized.

そして、このように実現するため、図１に示す実施例では、前記一方のコイルバネ７ｂと他方のコイルバネ7ａとの間には、一端開口している筒体の底部８ｂと、該筒体の前記一端開口部に設けられたフランジ部８ｃとで、前記両コイルバネ７ａ，７ｂの押圧力を伝達する金属製で筒状の伝達部材８が設けられている。この伝達部材８が在ることで、両コイルバネ７ａ，７ｂが前後方向において重複して配設され、全体長さＬを短くすることができるものである。尚、伝達部材８の開口側外周部は、側壁部２ａに穿孔した伝達部材支持用の穴２ｅに、摺動自在に嵌装され支持されるものである。   And in order to implement | achieve in this way, in the Example shown in FIG. 1, between the said one coil spring 7b and the other coil spring 7a, the bottom part 8b of the cylinder opened at one end, and the said cylinder of the said cylinder A metal-made cylindrical transmission member 8 that transmits the pressing force of the coil springs 7a and 7b is provided with a flange portion 8c provided at one end opening. Since the transmission member 8 is present, both the coil springs 7a and 7b are disposed in the front-rear direction so that the overall length L can be shortened. In addition, the opening side outer peripheral part of the transmission member 8 is slidably fitted and supported in a hole 2e for supporting the transmission member drilled in the side wall 2a.

尚、前記コイルバネ７ａ，７ｂの図１に示す上死点位置での長さについては、設計事項ではあるが、カムスライダー３の摺動において、始めから途中においては軽負荷にして、加工直前に工具等の戻しが確実に出来るように負荷を増大させればよいので、バネ定数の小さいコイルバネ７ａは長くして、バネ定数の大きいコイルバネ７ｂは短くする。また、その方が、カムベース２にカムスライダー３を組み付ける際にも、作業がやり易くなる。   The length of the coil springs 7a and 7b at the top dead center position shown in FIG. 1 is a matter of design, but during the sliding of the cam slider 3, a light load is applied from the beginning to the middle and immediately before machining. Since it is sufficient to increase the load so that the tool or the like can be reliably returned, the coil spring 7a having a small spring constant is lengthened and the coil spring 7b having a large spring constant is shortened. This also facilitates the work when the cam slider 3 is assembled to the cam base 2.

カムスライダー３のバネ収容空間に取り付けられるコイルバネ用のガイド棒３ｃにおける長手方向の長さと、細長い伝達部材８における長手方向の長さとは、これらの両コイルバネ７ａ，７ｂが縮小される押圧工程の途中で前記ガイド棒の先端３ｄと前記伝達部材８の底板の表面８ａとが当接して前記両コイルバネ７ａ，７ｂのいずれか、この実施例の場合にはコイルバネ７ｂを、強制的に押圧するように設定されている。バネ定数の大きいコイルバネ７ｂを押圧して負荷を増大させるためである。尚、このためには、前記伝達部材８のフランジ８ｃがカムベース２の側壁面２ａに当接しないで、前記コイルバネ７ｂが所要長さに縮まってから、前記側壁面２ａに当接するように設定する。   The length in the longitudinal direction of the guide rod 3c for the coil spring attached to the spring accommodating space of the cam slider 3 and the length in the longitudinal direction of the elongated transmission member 8 are in the middle of the pressing process in which both the coil springs 7a and 7b are reduced. Thus, the tip 3d of the guide rod and the surface 8a of the bottom plate of the transmission member 8 come into contact with each other so that either one of the coil springs 7a and 7b, in this embodiment, the coil spring 7b is forcibly pressed. Is set. This is because the coil spring 7b having a large spring constant is pressed to increase the load. For this purpose, the flange 8c of the transmission member 8 is set so as not to come into contact with the side wall surface 2a of the cam base 2 but to come into contact with the side wall surface 2a after the coil spring 7b is contracted to a required length. .

以上のようなカム装置５の戻し機構１により、コイルバネ７ａ，７ｂを重複させて配設し、２重バネの特徴を活かせると共に、カムスライダー３の下部のバネ収容部３ｂ、カムベース２の前後方向の長さを短くして、カム装置５を全体的にコンパクトにすることができる。   By the return mechanism 1 of the cam device 5 as described above, the coil springs 7 a and 7 b are overlapped to make use of the characteristics of the double spring, and the spring accommodating portion 3 b below the cam slider 3 and the front and rear of the cam base 2. The cam device 5 can be made compact as a whole by reducing the length in the direction.

前記コイルバネ７ａ，７ｂの配設の方法としては、図１乃至図２に示した実施例に限らず、例えば、図３（Ａ）に示すように、伝達部材８の中央部に貫通孔を設けて、ガイド棒３ｃの先端３ｄによって、側壁面２ａにフランジ８ｃが当接した後に、座金８ｅを介して直接コイルバネ７ｂを押圧するようにできる。   The method of arranging the coil springs 7a and 7b is not limited to the embodiment shown in FIGS. 1 and 2, and for example, as shown in FIG. 3A, a through hole is provided in the central portion of the transmission member 8. Thus, the coil spring 7b can be pressed directly through the washer 8e after the flange 8c abuts against the side wall surface 2a by the tip 3d of the guide bar 3c.

このようにすると、コイルバネ７ａ，７ｂの重複した範囲は減少するかもしれないが、図３（Ｂ）に示す荷重曲線が得られ、バネ定数ｋがｋ＝ｋＡ＋ｋＢとなって下死点の直近で高負荷となり、カムスライダー３の戻りの時の工具の引き抜きが確実になる。更に、図４（Ａ），（Ｂ）に示すように、伝達部材８をはじめからそのフランジ８ｃが側壁面２ａに着座した状態にして、ガイド棒３ｃの先端３ｄが座金８ｅに当接したときから、並列状態になってコイルバネ７ａ，７ｂを押圧するようにして、バネ定数を高くするようにしてもよい。この図３と図４に示す他の実施例においては、コイルバネ７ａ，７ｂのと由服する範囲が少ない分、軽負荷となって組立は行い易い。 In this way, the overlapping range of the coil springs 7a and 7b may decrease, but the load curve shown in FIG. 3B is obtained, and the spring constant k becomes k = k A + k B and the bottom dead center. The load becomes high immediately before the tool slider 3 is reliably pulled out when the cam slider 3 returns. Further, as shown in FIGS. 4A and 4B, when the flange 8c of the transmission member 8 is seated on the side wall surface 2a from the beginning, the tip 3d of the guide bar 3c abuts against the washer 8e. Therefore, the spring constant may be increased by pressing the coil springs 7a and 7b in a parallel state. In the other embodiments shown in FIGS. 3 and 4, the coil springs 7a and 7b have a small range, so that the load is light and easy to assemble.

本発明に係るカム装置の戻し機構１を示す断面図である。It is sectional drawing which shows the return mechanism 1 of the cam apparatus which concerns on this invention. 同本発明のカム装置の戻し機構１の下死点の位置での状態を示す断面図である。It is sectional drawing which shows the state in the position of the bottom dead center of the return mechanism 1 of the cam apparatus of the same invention. 他の実施例に係る戻し機構１ａの半断面図（Ａ）、そのストロークと荷重との関係を示す曲線図（Ｂ）である。It is the half sectional view (A) of the return mechanism 1a which concerns on another Example, and the curve figure (B) which shows the relationship between the stroke and a load. 他の実施例に係る戻し機構１ｂ，１ｃの半断面図（Ａ），（Ｂ）と、そのそのストロークと荷重との関係を示す曲線図（Ｃ）である。It is a half sectional view (A), (B) of return mechanism 1b, 1c concerning other examples, and a curve figure (C) showing the relation between the stroke and load. 従来例に係る戻し機構において、次第に押圧していく過程の説明図（Ａ），（Ｂ），（Ｃ）である。In the return mechanism which concerns on a prior art example, it is explanatory drawing (A), (B), (C) of the process which presses gradually.

１ カム装置の戻し機構、
１ａ，１ｂ，１ｃ 他の例に係るカム装置の戻し機構、
２ カムベース、 ２ａ 側壁面、
２ｂ ガイド部材、 ２ｃ ボルト、
２ｄ 側壁部、 ２ｅ 穴、
３ カムスライダー、 ３ａ 取付面、
３ｂ バネ収容部、 ３ｃ ガイド棒、
３ｄ ガイド棒の先端、
４ カムドライバー、
５ カム装置、
６ 戻し用コイルバネ、
７ａ，７ｂ コイルバネ、
８ 伝達部材、 ８ａ 表面、
８ｂ 底部、 ８ｃ フランジ部、
８ｄ ８ｅ 座金。 1 return mechanism of cam device,
1a, 1b, 1c Cam mechanism return mechanism according to another example,
2 Cam base, 2a Side wall surface,
2b guide member, 2c bolt,
2d side wall, 2e hole,
3 Cam slider, 3a Mounting surface,
3b spring accommodating part, 3c guide rod,
The tip of the 3d guide rod,
4 Cam driver,
5 cam device,
6 Return coil spring,
7a, 7b coil spring,
8 Transmission member, 8a Surface,
8b bottom, 8c flange,
8d 8e Washer.

Claims (3)

カム装置におけるカムスライダーが戻し用コイルバネの付勢力に抗して圧縮しワークに加工するように前進して、その後、前記圧縮されたコイルバネの付勢力で元の位置に戻る戻し機構において、
前記戻し用コイルバネが、前記カムスライダー下部のバネ収容空間と前記カムスライダーを摺動させ支持するカムベースの側壁部における前記バネ収容空間の一端側開口部に対向する側壁面との間に直列配列にして設けられる許容荷重の異なる二つのコイルバネからなり、
前記二つのコイルバネは、そのコイル直径が異なっていて一方のコイルバネの先端部が他方のコイルバネの一端側開口部から内側に入り込んでコイルバネの一部が重複して配設されていること、
を特徴とするカム装置の戻し機構。 In the return mechanism in which the cam slider in the cam device is compressed against the urging force of the return coil spring to advance into a workpiece and then returns to the original position by the urging force of the compressed coil spring.
The return coil spring is arranged in series between a spring accommodating space below the cam slider and a side wall facing the one end side opening of the spring accommodating space in the side wall of the cam base that slides and supports the cam slider. Consisting of two coil springs with different allowable loads,
The two coil springs have different coil diameters, the tip of one coil spring enters the inside from the one end opening of the other coil spring, and a part of the coil spring is disposed overlappingly,
The return mechanism of the cam device characterized by the above. 一方のコイルバネと他方のコイルバネとの間には、一端開口の筒体の底部と、該筒体の前記一端開口部に設けられたフランジ部とで、前記両コイルバネの押圧力を伝達する筒状の伝達部材が設けられていること、
を特徴とする請求項１に記載のカム装置の戻し機構。 Between the one coil spring and the other coil spring, a cylindrical shape that transmits the pressing force of the two coil springs at the bottom of the cylindrical body with one end opening and the flange portion provided at the one end opening of the cylindrical body A transmission member is provided,
The return mechanism for a cam device according to claim 1. カムスライダーのバネ収容空間に取り付けられるコイルバネ用のガイド棒における長手方向の長さと、細長い伝達部材における長手方向の長さとは、これらの両コイルバネが縮小される押圧工程の途中で前記ガイド棒の先端と前記伝達部材の底板の表面とが当接して前記両コイルバネのいずれかを押圧するように設定されていること、
を特徴とする請求項２に記載のカム装置の戻し機構。 The length in the longitudinal direction of the guide rod for the coil spring attached to the spring accommodating space of the cam slider and the length in the longitudinal direction of the elongated transmission member are the tip of the guide rod in the middle of the pressing process in which both the coil springs are reduced. And the surface of the bottom plate of the transmission member are in contact with each other and set so as to press either of the coil springs,
The return mechanism for a cam device according to claim 2.
JP2009002344A 2009-01-08 2009-01-08 Return mechanism for cam device Pending JP2010158700A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534519U (en) * 1978-08-29 1980-03-05
JPH08277959A (en) * 1995-04-06 1996-10-22 Okano Valve Seizo Kk Valve operating device
JP2001321855A (en) * 2000-05-16 2001-11-20 Daihatsu Motor Co Ltd Cam returning spring device for press die

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534519U (en) * 1978-08-29 1980-03-05
JPH08277959A (en) * 1995-04-06 1996-10-22 Okano Valve Seizo Kk Valve operating device
JP2001321855A (en) * 2000-05-16 2001-11-20 Daihatsu Motor Co Ltd Cam returning spring device for press die

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