JP2004218530A - Air compression device by rotation of feed shaft - Google Patents

Air compression device by rotation of feed shaft Download PDF

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Publication number
JP2004218530A
JP2004218530A JP2003006878A JP2003006878A JP2004218530A JP 2004218530 A JP2004218530 A JP 2004218530A JP 2003006878 A JP2003006878 A JP 2003006878A JP 2003006878 A JP2003006878 A JP 2003006878A JP 2004218530 A JP2004218530 A JP 2004218530A
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JP
Japan
Prior art keywords
air
compressed air
feed shaft
cam
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003006878A
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Japanese (ja)
Inventor
Wataru Hongo
渉 本郷
Hisaharu Saito
寿春 斎藤
Masanari Kito
勝成 鬼頭
Osamu Kuroda
修 黒田
Yukinobu Ueda
行信 植田
Takehiko Suzuki
毅彦 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Okuma Corp
Original Assignee
Okuma Corp
Okuma Machinery Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Okuma Corp, Okuma Machinery Works Ltd filed Critical Okuma Corp
Priority to JP2003006878A priority Critical patent/JP2004218530A/en
Publication of JP2004218530A publication Critical patent/JP2004218530A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an air compression device for a machine tool, which can generate only a necessary amount of compressed air to be used at the time of tool change, at a necessary pressure level, inside the machine tool, without requiring an additional compressed air supplying source outside the machine tool. <P>SOLUTION: A motor for driving a moving element of the machine tool for positioning is used as a prime motor, and a feed shaft for positioning the moving element is used as a driving shaft. A cam capable of applying displacement to a dependent node is mounted on the feed shaft, and a piston cylinder member capable of intermittently sending out air by converting displacement of the dependent node to displacement of a piston is provided. In addition, a tank that stores the air sent out against a check valve as certain compressed air is provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、工作機械等で主軸工具等の交換時に主軸周辺と工具等を清掃する場合に使用する空気圧縮装置に関する。
【0002】
【従来の技術】
工作機械等で主軸工具を交換する場合に、主軸の工具装着穴と工具とに圧縮空気を吐出して清掃を行っている。このため、従来から機外に設けたエアコンプレッサー等から工作機械の所要の部位に至る管路を配設し圧縮空気を導いて使用している。
【0003】
機内の回転部材の余剰エネルギーを利用して圧縮空気を発生する方法が開示されている。この方法によれば、プレス1サイクル中の減圧開始から可動盤下降完了までのほぼ1/3サイクルに相当する時間、無駄にされていた高圧ポンプからの油圧を利用しエアシリンダを駆動してアキュムレータへの圧縮空気補充を行うようにしたものであり、この場合は次のラムシリンダの上昇用の油圧駆動源を補助動力に活用するものである。この方法は高圧ポンプの油圧で1/3サイクルだけシリンダを駆動しているが機械の稼働中に連続的に圧縮空気を生成するのではなく高圧ポンプの有効活用に着眼点をおいている。(例えば特許文献1参照)
【0004】
〔特許文献1〕
特開昭50−141772号公報〔第2頁下段左欄第4行目から第3頁上段左欄第9行目、第1図〕
【0005】
【発明が解決しようとする課題】
従来技術で述べた主軸周辺と工具を清掃するための圧縮空気は、例えば加工機械とは別に圧縮空気発生装置を備え、その場所から各機械ごとにその位置まで配管を屋内装備として設ける必要があり、発生装置と配管設備の費用および更新費用が嵩むという問題を生じていた。
また、設備する機械ごとに外部から圧縮空気の供給が必要となると、圧縮空気発生機の台数も増加し消費電力も多くなって省エネルギー時代に対応していないという問題を含んでいた。
【0006】
また、機内に圧縮空気発生機構を有する場合であっても、駆動源の有効活用であり無駄な動作中の動力を利用して圧縮空気を発生させ、これを補助動力として活用するものであり、圧縮空気を連続的に発生させることができない技術が開示されているのみで、量的に圧縮空気を必要とする場合には応用できないという問題を有するものである。
【0007】
本発明は従来技術の有するこのような問題に鑑みなされたものであり、その目的とすることろは、機内において圧縮空気を必要とする場所の近くに存在する送り軸,駆動軸若しくは伝導軸にカムを取着し、このカムによりピストンを変位させることにより、シリンダ空室から断続的に逆止弁に抗してタンク内に空気を送り込んで所定の圧縮空気として貯え、電磁弁により圧縮空気を随時利用できるようにした空気圧縮装置を提供するものである。
【0008】
【課題を解決するための手段】
上記目的を達成するために本発明は、圧縮空気を生成する空気圧縮装置であって、機械の移動体を位置決め駆動するモータと、ベッドやコラム等の枠体に軸承され前記モータで駆動される送り軸と、該送り軸に取着され回転により従属節のピストンに変位を付与するカムと、該カムの作用を受けてシリンダ空室に外気の吸入のみ可とする第1逆止弁と、このシンリダ空室から排出する空気の逆流を不可とする第2逆止弁とを備えたピストン・シリンダ部材と、前記シリンダ空室から排出される空気を圧縮空気として貯蔵するタンクとを含んでなり、機内の送り軸の回転を駆動源としカムを駆動しシリンダ空室内の空気を断続的にタンクに送り圧縮空気を生成するものである。
【0009】
請求項1記載の発明によれば、主軸頭やテーブル等の移動体を案内するベッドやコラムに設けられる送り軸の軸端にカムを取着し、カムの外周面の変位量によりピストン・シリンダ部材を作動させて圧縮空気を生成するようにしたものである。送り軸は移動体の位置決めのため正逆回転するが回転中は絶えずシリンダ空室内の空気をタンクへ送り込むことができる。カム1個に対しピストン・シリンダ部材を複数設けて送り軸の1回転に対し複数回にわたり空気を送り込むことも可能であり、必要な量の圧縮空気を発生させることができる。
【0010】
なお、ピストン・シリンダ部材を駆動するための負荷が通常の負荷に加えられるため、カムは可能な限り駆動用モータ軸の近くに設けるのが望ましい。
しかし、軸の捩じれが機械生産に影響しない場合はこのような制限を受けることはない。伝導軸が存在し、ピストン・シリンダ部材とエアタンクを設けることは可能な部位に装置することも可能である。
【0011】
【発明の実施の形態】
以下本発明の実施の態様を図面にもとづいて説明する。
図1は本発明の主要部の構成説明図である。ベッド,コラム,横桁等の機械を構成する主要な枠体に軸承される送り軸1の両軸端にカム2A,2Bを取着し送り軸1を図示しない制御モータを原動機として回転させることにより正逆の回転方向の如何に関わらず、カム2A,2Bの従属節であるピストンに変位を付与し、これにより第1逆止弁を介しピストン・シリンダ部材3A,3Bのそれぞれのシリンダ空室に吸入した外気を第2逆止弁に抗しタンク6に断続的に送り込んでいる。
【0012】
タンク6には圧力が所定値の圧縮空気が貯えられる。この圧縮空気は必要に応じバルブ7を開口して送り出して使用することができる。送り軸1に取着するカム2は一方の軸端にのみ設けることも可能である。送り軸1に捩じれを発生させないためにはモータに近い位置にカム2を設けることが望ましい。
なお、一つのカム2に対してピストン・シリンダ部材を複数設置して必要な圧縮空気を生成させることが可能である。
【0013】
ピストン・シリンダ部材3A,3Bには、シリンダ内にばねが設けられている単動式シリンダを用いることができる。単動式シリンダのピストンはばねでカム面に押圧されている。ピストンがカムで変位しばねを圧縮してシリンダ空室の空気をタンク6に所定圧に達するまで送り込んでいる。貯えられた圧縮空気は二方向の電磁弁7の操作により必要に応じ取り出すことができる。なお、送り軸1はテーブル・主軸頭等の移動体8を位置決めする。
【0014】
〔実施例〕
図2は本発明を実施した送り軸の回転による空気圧縮装置、図3は図2の左側面図である。図2において、ベッド等の機械の枠体9に原動部のモータ10が設けられ、同じくベッド上で軸受11に支承される送り軸1を回転駆動し移動体8を位置決めしている。
本実施例では、モータ10が取着されていない送り軸1の軸端に支え12で支承されるカム軸13に嵌装されカム2が設けられている。なお、送り軸1とカム軸13と間の伝導は歯車14A,14Bで行われている。
【0015】
図3において、移動体8と一対の平行なガイドレール15A,15Bで案内される。例えば、ベッドの左側面9Aにはピストン・シリンダ部材3A,3Bがカム軸13を中心に対称的に設けられている。図に例示するピストン・シリンダ部材3A,3Bは単動式シリンダであり、カム2の外周面にばね16で付勢されて当接している。なお、ピストン・シリンダ部材は単動式シリンダに限定されるものではなく、カム2A,2Bに確動カム方式を採用してピストンを往復動させることも可能である。
【0016】
それぞれのシリンダの空室への通気口には、空室の空気を外気へ流出させない第1逆止弁4A,4Bが設けられ外気の吸入のみを可としている。また、タンク6から圧力空気を逆流させないように第2逆止弁5A,5Bがタンク6へ通じる管路の途中に設けられ、タンク内に圧縮空気を貯蔵できるようにしている。
タンク6には断続的であるが送り軸1が駆動されている限りシリンダ空室から新たな空気が送り込まれので、タンク6内の圧力を所定値に保持するように圧力調整弁17が設けられている。工具交換時、圧縮空気を取り出すために操作される二方向電磁弁18が設けられている。
【0017】
ここでタンク6に圧縮空気が蓄積されるプロセスについて考察する。
タンク6にシリンダ空室から空気が送り込まれていない時は、ピストンは空気内のばね16に抗して空室内の空気をタンク6に送り出している。送り込んだ空気は逆止弁5A,5Bによりタンク6から逆流することはない。
従って、徐々にタンク6内の空気圧力が上昇する。この状態でシリンダ空室の空気をタンク内に続いて送り込む場合は、逆止弁5A,5Bに抗して仕事をしなければならないので、それに対応してシリンダ空室内の空気も圧縮されることになる。
【0018】
従ってピストン・シリンダ部材3A,3Bのピストンを無理なく変位させるために設計上の配慮が必要である。例えば、ピストンの一回の変位量を小さくしたり、送り軸1の一回転だとの変位回数を複数回となるようカム山を設計するのが良い。
また、送り軸1に取着するカム2の位置もモータ10に近い位置が良く、取着する個所も分散させ、複数個のカム2を用いる方法も選択肢として考えられる。
なお、カム2に確動カムを採用し変位を取り出すようにすれば、ばね16を圧縮させるための負荷は軽減できるので有利である。
なお、圧縮・蓄積した空気の用途は、これに限定されるものではなく、例えば、ワーク上に堆積した切粉を吹き飛ばすエアに使用するなど他の用途に利用しても良い。
【0019】
【発明の効果】
本発明の装置は上述のように構成されているので、次に記載する効果を奏する。
請求項1の発明は機内において必要に応じた量の圧縮空気を生成させることができる。従って、機外にエアコンプレッサー等の設備を設けることを要しないので設備費用の低減が可能という効果を有する。
また、工場設備としての配管が不要であり、また高圧配管による空気漏れ等の発生によるロスがなくなり必要な圧力の圧縮空気を必要な量だけ機内タンクに溜めて使用すれば良いので、消費電力も少なくなり運転コストが少なくなるという効果を有する。
また、高圧の圧縮空気源用のエアコンプレッサーは寿命が短く設備の更新費用が高価であるが、このようなコスト要因を避けることができるという効果を有する。
【図面の簡単な説明】
【図1】本発明の主要部の構成説明図である。
【図2】送り軸の回転による空気圧縮装置図である。
【図3】図2の左側面図である。
【符号の説明】
1 送り軸 2A,2B カム
3A,3B ピストン・シリンダ部材
4 第1逆止弁 5 第2逆止弁
6 タンク 7 電磁弁
8 移動体 9 機械の枠体
10 モータ 11 軸受
12 支え 13 カム軸
14A,14B 歯車
15A,15B ガイドレール
16 ばね 17 圧力調整弁
18 二方向電磁弁
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air compression device used for cleaning a periphery of a spindle and a tool or the like when replacing a spindle tool or the like with a machine tool or the like.
[0002]
[Prior art]
When a spindle tool is replaced with a machine tool or the like, cleaning is performed by discharging compressed air to a tool mounting hole of the spindle and the tool. For this reason, conventionally, a pipeline from an air compressor or the like provided outside the machine to a required portion of the machine tool is arranged to guide and use the compressed air.
[0003]
A method for generating compressed air by using surplus energy of a rotating member in the machine is disclosed. According to this method, the accumulator is driven by using the wasted oil pressure from the high-pressure pump for a time corresponding to approximately 1/3 cycle from the start of pressure reduction in one cycle of the press to the completion of the lowering of the movable platen. In this case, a hydraulic drive source for raising the next ram cylinder is used as auxiliary power. This method drives the cylinder by 1/3 cycle with the hydraulic pressure of the high-pressure pump, but focuses on the effective use of the high-pressure pump instead of continuously generating compressed air during operation of the machine. (For example, see Patent Document 1)
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. Sho 50-141772 [page 2, lower left column, fourth line to page 3, upper left column, ninth line, FIG. 1]
[0005]
[Problems to be solved by the invention]
Compressed air for cleaning the periphery of the spindle and tools described in the prior art, for example, it is necessary to provide a compressed air generator separately from the processing machine, and to provide piping from that location to that position for each machine as indoor equipment In addition, there has been a problem that the cost of the generator and the piping equipment and the replacement cost are increased.
Further, if the supply of compressed air is required from the outside for each machine to be installed, the number of compressed air generators is increased, the power consumption is increased, and there is a problem that it is not compatible with the energy saving era.
[0006]
In addition, even when a compressed air generating mechanism is provided in the machine, the drive source is effectively used, and compressed air is generated by using useless power during operation, and the compressed air is used as auxiliary power. It only discloses a technique that cannot continuously generate compressed air, and has a problem that it cannot be applied when compressed air is required quantitatively.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and an object thereof is to provide a feed shaft, a drive shaft, or a transmission shaft existing near a place where compressed air is required in a machine. By attaching a cam and displacing the piston with this cam, air is intermittently sent from the cylinder empty chamber into the tank against the check valve and stored as predetermined compressed air. An object of the present invention is to provide an air compression device which can be used at any time.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is an air compression device for generating compressed air, which is a motor for positioning and driving a moving body of a machine, and is supported by a frame such as a bed or a column and driven by the motor. A feed shaft, a cam attached to the feed shaft and imparting displacement to a subordinate joint piston by rotation, a first check valve that allows only external air to be sucked into the cylinder chamber under the action of the cam, A piston / cylinder member provided with a second check valve for preventing backflow of air discharged from the thin chamber, and a tank for storing air discharged from the cylinder chamber as compressed air. The cam is driven by the rotation of a feed shaft in the machine as a drive source to intermittently send air in a cylinder chamber to a tank to generate compressed air.
[0009]
According to the first aspect of the present invention, a cam is attached to a shaft end of a feed shaft provided on a bed or a column for guiding a moving body such as a spindle head or a table, and a piston / cylinder is determined by a displacement amount of an outer peripheral surface of the cam. A member is operated to generate compressed air. The feed shaft rotates forward and backward for positioning of the moving body, but the air in the cylinder chamber can be constantly fed into the tank during rotation. It is also possible to provide a plurality of piston / cylinder members for one cam and to feed air a plurality of times for one rotation of the feed shaft, so that a required amount of compressed air can be generated.
[0010]
Since a load for driving the piston / cylinder member is added to a normal load, it is desirable that the cam be provided as close to the drive motor shaft as possible.
However, such limitation is not imposed if the torsion of the shaft does not affect the machine production. It is also possible to install the device at a position where a transmission shaft exists and where a piston / cylinder member and an air tank can be provided.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram of a configuration of a main part of the present invention. Cams 2A and 2B are attached to both shaft ends of a feed shaft 1 which is supported on a main frame constituting a machine such as a bed, a column, a horizontal girder, and the feed shaft 1 is rotated by a control motor (not shown) as a prime mover. Irrespective of the forward and reverse rotation directions, a displacement is imparted to the pistons which are subordinate nodes of the cams 2A, 2B, and thereby the respective cylinder vacancies of the piston / cylinder members 3A, 3B are passed through the first check valve. Is intermittently fed into the tank 6 against the second check valve.
[0012]
The tank 6 stores compressed air having a predetermined pressure. This compressed air can be used by opening the valve 7 as needed and sending it out. The cam 2 attached to the feed shaft 1 can be provided at only one shaft end. In order to prevent the feed shaft 1 from being twisted, it is desirable to provide the cam 2 near the motor.
Note that a plurality of piston / cylinder members can be provided for one cam 2 to generate necessary compressed air.
[0013]
A single-acting cylinder in which a spring is provided in the cylinder can be used for the piston / cylinder members 3A and 3B. The piston of the single-acting cylinder is pressed against the cam surface by a spring. The piston is displaced by the cam, compresses the spring, and sends the air in the cylinder chamber to the tank 6 until the pressure reaches a predetermined pressure. The stored compressed air can be taken out as needed by operating the two-way solenoid valve 7. The feed shaft 1 positions a moving body 8 such as a table or a spindle head.
[0014]
〔Example〕
FIG. 2 is an air compression device by rotation of a feed shaft embodying the present invention, and FIG. 3 is a left side view of FIG. In FIG. 2, a motor 10 of a driving unit is provided on a frame 9 of a machine such as a bed, and the feed shaft 1 supported on a bearing 11 is also rotated on the bed to position the moving body 8.
In this embodiment, a cam 2 is provided by being fitted to a cam shaft 13 supported by a support 12 at the shaft end of the feed shaft 1 to which the motor 10 is not attached. The transmission between the feed shaft 1 and the cam shaft 13 is performed by the gears 14A and 14B.
[0015]
In FIG. 3, the movable body 8 is guided by a pair of parallel guide rails 15A and 15B. For example, piston / cylinder members 3A and 3B are provided symmetrically about the cam shaft 13 on the left side surface 9A of the bed. The piston / cylinder members 3A and 3B illustrated in the figure are single-acting cylinders, and are urged by the spring 16 to abut the outer peripheral surface of the cam 2. The piston / cylinder member is not limited to a single-acting cylinder, but the pistons can be reciprocated by adopting a positive cam system for the cams 2A and 2B.
[0016]
The first check valves 4A and 4B that prevent the air in the vacant chamber from flowing out to the outside air are provided in the ventilation holes to the vacant chambers of the respective cylinders so that only the outside air can be sucked. Further, the second check valves 5A and 5B are provided in the middle of the pipeline leading to the tank 6 so that the compressed air does not flow backward from the tank 6, so that the compressed air can be stored in the tank.
Since the tank 6 is intermittently supplied with new air from the cylinder chamber as long as the feed shaft 1 is driven, a pressure regulating valve 17 is provided to keep the pressure in the tank 6 at a predetermined value. ing. A two-way solenoid valve 18 that is operated to take out compressed air when changing tools is provided.
[0017]
Here, a process in which the compressed air is accumulated in the tank 6 will be considered.
When air is not being fed into the tank 6 from the cylinder chamber, the piston is sending air from the chamber to the tank 6 against the spring 16 in the air. The supplied air does not flow backward from the tank 6 by the check valves 5A and 5B.
Therefore, the air pressure in the tank 6 gradually increases. If the air in the cylinder vacancy is continuously fed into the tank in this state, work must be performed against the check valves 5A and 5B, so that the air in the cylinder vacancy is correspondingly compressed. become.
[0018]
Therefore, it is necessary to consider the design in order to easily displace the pistons of the piston / cylinder members 3A and 3B. For example, it is preferable to design the cam ridge so that the amount of displacement of the piston at one time is reduced, or the number of times of displacement per rotation of the feed shaft 1 is plural.
Also, the position of the cam 2 attached to the feed shaft 1 is preferably close to the motor 10, and the attachment points are dispersed, and a method using a plurality of cams 2 is also considered as an option.
It is advantageous to adopt a positive cam as the cam 2 to take out the displacement, since the load for compressing the spring 16 can be reduced.
The use of the compressed and accumulated air is not limited to this, and the air may be used for other purposes such as, for example, using the air that blows off chips accumulated on the work.
[0019]
【The invention's effect】
Since the device of the present invention is configured as described above, the following effects can be obtained.
According to the first aspect of the present invention, a required amount of compressed air can be generated in the machine. Therefore, there is no need to provide facilities such as an air compressor outside the machine, and thus there is an effect that facility costs can be reduced.
In addition, there is no need for piping as factory equipment, and there is no loss due to the occurrence of air leakage etc. due to high-pressure piping, and only the required amount of compressed air at the required pressure can be stored in the in-machine tank and used. This has the effect of reducing the operating cost.
In addition, the air compressor for the high-pressure compressed air source has a short life and a high facility replacement cost, but has the effect that such cost factors can be avoided.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a configuration of a main part of the present invention.
FIG. 2 is a diagram of an air compression device based on rotation of a feed shaft.
FIG. 3 is a left side view of FIG.
[Explanation of symbols]
Reference Signs List 1 feed shaft 2A, 2B cam 3A, 3B piston / cylinder member 4 first check valve 5 second check valve 6 tank 7 solenoid valve 8 moving body 9 machine frame 10 motor 11 bearing 12 support 13 cam shaft 14A, 14B Gear 15A, 15B Guide rail 16 Spring 17 Pressure regulating valve 18 Two-way solenoid valve

Claims (1)

圧縮空気を生成する空気圧縮装置であって、機械の移動体を位置決め駆動するモータと、ベッドやコラム等の枠体に軸承され前記モータで駆動される送り軸と、該送り軸に取着され回転により従属節のピストンに変位を付与するカムと、該カムの作用を受けてシリンダ空室に外気の吸入のみ可とする第1逆止弁と、このシンリダ空室から排出する空気の逆流を不可とする第2逆止弁とを備えたピストン・シリンダ部材と、前記シリンダ空室から排出される空気を圧縮空気として貯蔵するタンクとを含んでなり、機内の送り軸の回転を駆動源としカムを駆動しシリンダ空室内の空気を断続的にタンクに送り圧縮空気を生成することを特徴とする送り軸の回転による空気圧縮装置。An air compressor for generating compressed air, a motor for positioning and driving a moving body of a machine, a feed shaft which is mounted on a frame such as a bed or a column and driven by the motor, and which is attached to the feed shaft. A cam that imparts displacement to the piston of the subordinate node by rotation, a first check valve that allows only external air to be sucked into the cylinder chamber by the action of the cam, and a reverse flow of air that is discharged from the cylinder chamber. A piston / cylinder member provided with a second check valve to be disabled, and a tank for storing air discharged from the cylinder chamber as compressed air, wherein rotation of a feed shaft in the machine is used as a drive source. An air compression device based on rotation of a feed shaft, wherein a cam is driven to intermittently send air in a cylinder chamber to a tank to generate compressed air.
JP2003006878A 2003-01-15 2003-01-15 Air compression device by rotation of feed shaft Pending JP2004218530A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009050931A1 (en) * 2007-10-15 2009-04-23 Shibamoto, Kiyoko Multiple confronting symmetry cam drive plunger pump
JP2010137319A (en) * 2008-12-10 2010-06-24 Komatsu Ntc Ltd Machine tool and machining line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009050931A1 (en) * 2007-10-15 2009-04-23 Shibamoto, Kiyoko Multiple confronting symmetry cam drive plunger pump
JP2010137319A (en) * 2008-12-10 2010-06-24 Komatsu Ntc Ltd Machine tool and machining line

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