JP3298271B2 - Workpiece holding device - Google Patents
Workpiece holding deviceInfo
- Publication number
- JP3298271B2 JP3298271B2 JP29191493A JP29191493A JP3298271B2 JP 3298271 B2 JP3298271 B2 JP 3298271B2 JP 29191493 A JP29191493 A JP 29191493A JP 29191493 A JP29191493 A JP 29191493A JP 3298271 B2 JP3298271 B2 JP 3298271B2
- Authority
- JP
- Japan
- Prior art keywords
- face plate
- conical cam
- rotating face
- arm
- rotating
- 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.)
- Expired - Fee Related
Links
Landscapes
- Gripping On Spindles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主軸台等に設けられる
工作物の把持装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work holding device provided on a headstock or the like.
【０００２】[0002]
【従来の技術】従来、把持爪をアンクランプ状態に作動
する直動シリンダ装置等を主軸台前面から排除し、主軸
台前方のスペースを確保するようにした工作物把持装置
として、特開平４−１３５１１０号が公知である。この
技術の概要は以下の通りである。即ち、主軸台に回転可
能に軸承された駆動プーリに同心で回転面板を固定し、
この回転面板の前方に揺動面板を回転方向に揺動可能に
支持し、この揺動面板上で把持爪を円周上略３等分位置
に揺動面板を貫通した係合ピンの軸線回りに回転可能に
支持するとともに、回転面板から突出した支持軸を把持
爪に係合させる。そして、回転面板と揺動面板との間に
バネを設けることにより、揺動面板は把持爪が工作物を
クランプする方向に常時付勢された状態となっている。2. Description of the Related Art Conventionally, as a workpiece gripping device, a linear motion cylinder device for operating a gripping claw in an unclamped state is removed from the front of a headstock to secure a space in front of the headstock. No. 135110 is known. The outline of this technology is as follows. That is, the rotating face plate is fixed concentrically to the drive pulley rotatably supported on the headstock,
A swinging face plate is supported in front of the rotating face plate so as to be swingable in the rotation direction, and a gripping claw is disposed on the swinging face plate at approximately three equally spaced positions around the axis of an engaging pin that has penetrated the swinging face plate. And a supporting shaft protruding from the rotating face plate is engaged with the gripping claw. By providing a spring between the rotating face plate and the swing face plate, the swing face plate is always urged in the direction in which the gripping claws clamp the workpiece.
【０００３】また、揺動面板と回転面板との間でローラ
が取り付けられた揺動レバーを支持軸の軸線回りに回転
可能に支持するとともに、この揺動レバーの先端を係合
ピンと係合させる。そして、回転面板の中心部で駆動プ
ーリの軸線方向に円錐カムを進退可能に配置し、この円
錐カム前進時に円錐カムとローラが当接することによ
り、揺動レバーを回転面板の外側方向に旋回させ、これ
に伴い、揺動面板がバネの付勢方向と逆方向に回転し、
把持爪を開き方向に旋回させ、アンクランプ状態とす
る。Further, a rocking lever having rollers mounted between the rocking face plate and the rotating face plate is rotatably supported around the axis of a support shaft, and the tip of the rocking lever is engaged with an engaging pin. . A conical cam is arranged so as to be able to advance and retreat in the axial direction of the driving pulley at the center of the rotating face plate. When the cone cam and the roller come into contact with each other when the conical cam advances, the swing lever is turned outwardly of the rotating face plate. With this, the swinging face plate rotates in the direction opposite to the biasing direction of the spring,
The grasping claw is turned in the opening direction to be in the unclamped state.
【０００４】[0004]
【課題を解決するための課題】かかる従来の工作物把持
装置において、径差の異なる多種の工作物に対応するた
め、把持爪のカム幅を大きくすると、アンクランプ時の
把持爪およびローラの揺動量が大きくなってしまう。ロ
ーラは支持軸を中心とした円周上を揺動するため、揺動
量が大きくなると、円錐カムとの接触位置がずれ、点接
触でなくなるため、ローラに滑りが生じて回転しにくく
なり、ローラに無理な荷重がかかってしまう。従って、
ローラの磨耗が大となり、ローラの耐久性が悪くなると
いう問題がある。In such a conventional workpiece gripping device, when the cam width of the gripping claws is increased in order to cope with various types of workpieces having different diameters, the swing of the gripping claws and rollers during unclamping is increased. The momentum increases. Since the rollers to swing on the circumference around the support shaft, the swing amount is increased, shift the contact position of the conical cams, to become not touch point contact <br/>, sliding rollers caused rotation And the roller is subjected to an excessive load. Therefore,
There is a problem that the abrasion of the roller increases and the durability of the roller deteriorates.
【０００５】[0005]
【課題を解決するための手段】本発明の工作物把持装置
は、上述した問題点を解決するためになされたもので、
主軸台に回転可能に軸承された駆動部材と、この駆動部
材に同心で固定された回転面板と、この回転面板の中心
部で前記駆動部材の回転軸線方向に進退移動可能に配置
された円錐カムと、前記回転面板の板面に一端を回転可
能に枢支された揺動レバーと、この揺動レバーの他端に
一端が回転可能に枢着され、前記円錐カムの前進時に前
記円錐カムと点接触で当接するとともに前記円錐カムの
径方向に移動されるローラが回転自在に取り付けられた
アームと、このアームの他端に一端が回転可能に枢着さ
れるとともに他端が前記回転面板の板面に枢支されて前
記アームおよび前記揺動レバーとによって平行リンク機
構を構成するリンクと、前記揺動レバーの旋回に応じて
開閉可能に枢支された把持爪と、この把持爪を常に閉じ
方向に付勢するバネと、前記円錐カムを進退作動させる
進退作動用アクチュエータと、前記駆動部材を回転駆動
するモータとを備えたものである。SUMMARY OF THE INVENTION A work holding device according to the present invention has been made to solve the above-mentioned problems.
A driving member rotatably mounted on the headstock, a rotating face plate concentrically fixed to the driving member, and a conical cam arranged at the center of the rotating face plate so as to be able to advance and retreat in the direction of the rotation axis of the driving member. A swing lever pivotally supported at one end rotatably on the plate surface of the rotating face plate, and one end rotatably pivoted at the other end of the swing lever, and the cone cam when the cone cam advances. An arm, which is rotatably mounted with a roller that abuts by point contact and is moved in the radial direction of the conical cam, has one end rotatably pivotally attached to the other end of the arm and the other end of the rotating face plate. and links constituting the parallel link mechanism by the front <br/> Symbol arm and the swing lever is pivotally supported on the plate surface, and openable the pivoted gripping claws in accordance with the turning of the rocking lever, Always urge this gripper in the closing direction A spring, and a forward and backward actuating actuator for advancing and retracting operation of said conical cam, in which a motor for rotating the drive member.
【０００６】[0006]
【作用】上記のように構成された工作物把持装置は、円
錐カムが後退している時には把持爪はバネにより閉じ方
向に付勢され工作物をクランプした状態となる。円錐カ
ムを前進作動させると、円錐カムとローラとが当接し、
揺動レバーを外側方向に旋回させる。この旋回により把
持爪はバネの付勢力に抗して開き方向に作動してアンク
ランプ状態となる。ここで、ローラは平行リンク機構に
より円錐カムの径方向に移動されるので、常に円錐カム
に対して点接触を保ちながら転動する。In the workpiece gripping device constructed as described above, when the conical cam is retracted, the gripping claws are urged in the closing direction by a spring to clamp the workpiece. When the conical cam is operated forward, the conical cam and the roller abut,
Rotate the swing lever outward. Due to this rotation, the gripping claw operates in the opening direction against the urging force of the spring to enter an unclamped state. Here, since the roller is moved in the radial direction of the conical cam by the parallel link mechanism, it always rolls while maintaining point contact with the conical cam.
【０００７】[0007]
【実施例】以下本発明の実施例について図面に基づいて
説明する。図１において、１は主軸台本体、２はこの主
軸台本体１に固定された固定軸であり、この固定軸２の
先端に主軸センタ３が嵌着されている。また、この固定
軸２には駆動プーリ４（駆動部材）が回転可能に軸承さ
れ、図略のモータによって回転駆動されるようになって
いる。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a headstock main body, and 2 denotes a fixed shaft fixed to the headstock main body 1, and a spindle center 3 is fitted to a tip of the fixed shaft 2. A drive pulley 4 (drive member) is rotatably mounted on the fixed shaft 2 and is driven to rotate by a motor (not shown).
【０００８】５は駆動プーリに固設した回転面板であ
り、この回転面板５上の円周略３等分割位置に駆動プー
リ５の回転軸線方向に支持軸６が突設されている。７は
揺動面板であり、この揺動面板７の板面３個所に回転中
心を半径とする円弧状の穴８が設けられ、前記回転面板
５の前方で前記支持軸６に前記円弧状の穴８を介して回
転方向に揺動可能に支持されている。この揺動面板７の
板面には環状の取付板９が同心で固設され、この取付板
９の円周上略３等分割位置に前記支持軸６と係合する把
持爪１０が支軸１１によって枢支されている。そして、
この把持爪１０が協同して把持爪１０に形成されたカム
部１０ａによって工作物Ｗをクランプする閉じ方向に回
動するように前記揺動面板７は前記回転面板５との間
で、バネ１２により回転力が付勢されている。Reference numeral 5 denotes a rotary face plate fixed to the drive pulley, and a support shaft 6 protrudes in the direction of the rotation axis of the drive pulley 5 at approximately three equally-divided positions on the rotary face plate 5 along the circumference. Reference numeral 7 denotes an oscillating face plate. An arc-shaped hole 8 having a center of rotation as a radius is provided at three plate faces of the oscillating face plate 7, and the arc of the support shaft 6 is provided in front of the rotating face plate 5 on the support shaft 6. It is supported via a hole 8 so as to be swingable in the rotational direction. An annular mounting plate 9 is concentrically fixed on the plate surface of the swinging surface plate 7, and a gripping claw 10 that engages with the support shaft 6 is provided on the support plate 6 at approximately three equally divided positions on the circumference of the mounting plate 9. It is pivoted by 11. And
The swinging face plate 7 is moved between the rotating face plate 5 and the spring 12 so that the gripping claws 10 cooperate with each other to rotate in a closing direction in which the workpiece W is clamped by a cam portion 10 a formed on the gripping claws 10. The rotational force is urged by.
【０００９】前記回転面板５と揺動面板７との間には、
揺動レバー１３が前記支持軸６の軸線回りに回動可能に
支持されている。そして、この揺動レバー１３には係合
凹溝１４が形成されており、この係合凹溝１４が前記支
軸１１に係合している。また、前記回転面板５の板面に
は支持ピン１７が各々突設されており、この支持ピン１
７の軸線回りにリンク１６の一端が回動可能に枢支され
ている。そして、このリンク１６の他端と前記揺動レバ
ー１３の一端とにアーム１８が枢着されている。また、
このアーム１８には後述する円錐カム２１の前進時に円
錐カム２１と点接触で当接するローラ１９が回転自在に
設けられている。Between the rotary face plate 5 and the swing face plate 7,
A swing lever 13 is supported rotatably about the axis of the support shaft 6. An engagement groove 14 is formed in the swing lever 13, and the engagement groove 14 is engaged with the support shaft 11. A support pin 17 is provided on the surface of the rotary face plate 5 so as to protrude therefrom.
One end of a link 16 is rotatably supported about the axis of 7. An arm 18 is pivotally connected to the other end of the link 16 and one end of the swing lever 13. Also,
The arm 18 is rotatably provided with a roller 19 that comes into contact with the conical cam 21 at a point contact when the conical cam 21 described later advances.
【００１０】従って、前記揺動レバー１３とリンク１６
とアーム１８とによって平行リンク機構１５を構成し、
この平行リンク機構１５によって、ローラ１３が回転面
板５の径方向に移動されるようになっている。これによ
り、前記ローラ１９は後述する円錐カム２１と点接触を
保って転動される。ここで、ローラ１３の径方向移動
時、アーム１８が前記回転面板５に干渉しないように、
前記回転面板５には空間部２０が形成されている。Therefore, the swing lever 13 and the link 16
And the arm 18 constitute a parallel link mechanism 15,
The roller 13 is moved in the radial direction of the rotating face plate 5 by the parallel link mechanism 15. As a result, the roller 19 is rolled while maintaining point contact with a conical cam 21 described later. Here, when the roller 13 moves in the radial direction, the arm 18 does not interfere with the rotating face plate 5 so that
A space 20 is formed in the rotating face plate 5.
【００１１】２１は円錐カムであり、前記回転面板５の
中央部で固定軸２の軸線方向に進退移動可能に配置さ
れ、前進動によりアーム１８のローラ１９に当接する。
この円錐カム２１の進退作動機構は、固定軸２の後方の
主軸台本体１に固設されたシリンダ２２の図略のピスト
ンに一体的に形成されたピストンロッド２３に係止バー
２４、２５を設け、そして、ピストンロッド２３を摺動
可能に支持するとともに前記係止バー２４、２５を案内
する案内溝２６が形成されたガイド部材２７を主軸台本
体１に固設し、このガイド部材２７の外周に前記係止バ
ー２４、２５によって軸方向移動が係止される環状の連
動部材２８を配設し、この連動部材２８に作動ロッド２
９を介して前記円錐カム２１を連結して構成されてい
る。Reference numeral 21 denotes a conical cam, which is disposed at the center of the rotary face plate 5 so as to be able to advance and retreat in the axial direction of the fixed shaft 2, and comes into contact with the roller 19 of the arm 18 by forward movement.
The reciprocating operation mechanism of the conical cam 21 includes locking bars 24 and 25 on a piston rod 23 formed integrally with a piston (not shown) of a cylinder 22 fixed to the headstock body 1 behind the fixed shaft 2. And a guide member 27 having a guide groove 26 for slidably supporting the piston rod 23 and guiding the locking bars 24 and 25 is fixed to the headstock body 1. An annular interlocking member 28 whose axial movement is locked by the locking bars 24 and 25 is provided on the outer periphery.
9, the conical cams 21 are connected to each other.
【００１２】次に、本実施例の工作物把持装置の作用を
説明する。上記構成において円錐カムは通常後退端に位
置し、揺動面板７はバネ１２の引張力により回転面板５
に対して所定の回転角で相対回転され、支持軸６と係合
している把持爪１０が閉じ方向に旋回された状態となっ
ている。この状態から工作物Ｗをクランプする場合に
は、先ず、シリンダ２２を作動させて円錐カム２１を図
１に示す２１aの位置まで前進させる。この前進により
アーム１８に取り付けられているローラ１９に円錐カム
２１のテーパ面が点接触で当接し、アーム１８は平行リ
ンク機構１５の作用によって回転面板５の径方向にロー
ラ１９が点接触を保って転動しながら図２に示す１９a
の位置まで移動される。これにより、揺動レバー１３は
支持軸６を支点として半径方向外側に図３に示す１３a
の位置まで回動される。揺動レバー１３の回動により支
軸１１を介して揺動面板７はバネ１２の引張力に抗して
相対回転し、固定側の回転面板５と一体的な支持軸６に
係合している把持爪１０は開き方向に旋回され、工作物
Ｗをクランプ可能な状態となる。Next, the operation of the workpiece holding device of the present embodiment will be described. In the above configuration, the conical cam is usually located at the retracted end, and the swing face plate 7 is rotated by the tension force of the spring 12.
And the gripping claw 10 engaged with the support shaft 6 is turned in the closing direction. When clamping the workpiece W from this state, first, the cylinder 22 is operated to advance the conical cam 21 to the position 21a shown in FIG. As a result of this advance, the tapered surface of the conical cam 21 comes into contact with the roller 19 attached to the arm 18 at a point contact, and the roller 18 keeps the point contact in the radial direction of the rotating face plate 5 by the action of the parallel link mechanism 15. 19a shown in FIG.
Is moved to the position. As a result, the swing lever 13 is moved radially outward with respect to the support shaft 6 as a fulcrum, as shown in FIG.
Is rotated to the position. Due to the rotation of the swing lever 13, the swing face plate 7 relatively rotates via the support shaft 11 against the tensile force of the spring 12, and engages with the support shaft 6 integrated with the fixed-side rotating face plate 5. The gripper 10 is turned in the opening direction, and the workpiece W can be clamped.
【００１３】このような把持爪１０が開いた状態で、固
定軸２の主軸センタ３に工作物Ｗを取り付けた後、円錐
カム２１を後退移動させることにより、アーム１８のロ
ーラ１９との当接が解除され、バネ１２の引張力により
揺動面板７が回転面板５に対し相対回転され、上述した
ように把持爪１０を閉じ方向に旋回し、工作物Ｗを把持
爪１０のカム部１０ａの３点で自動求心してクランプす
る。After the workpiece W is mounted on the spindle center 3 of the fixed shaft 2 with the gripping claw 10 opened, the conical cam 21 is moved backward to abut on the roller 19 of the arm 18. Is released, the swinging face plate 7 is relatively rotated with respect to the rotating face plate 5 by the tension force of the spring 12, and the gripping claw 10 is turned in the closing direction as described above, thereby moving the workpiece W to the cam portion 10a of the gripping claw 10. Clamps automatically at three points.
【００１４】この状態で、工作物Ｗの加工のために図略
のモータにより駆動プーリ４を反時計回りに回転させる
と、回転面板５が同方向に回転し、この回転面板５の回
転が支持軸６を介して把持爪１０に伝達され、工作物Ｗ
を回転駆動する。この時、工作物Ｗの回転駆動方向が把
持爪１０の工作物Ｗに対するクランプ方向への偏心旋回
傾向となるため、強固なクランプ状態を確保できる。こ
こで、揺動面板７は回転面板５と連れ回りされる。In this state, when the drive pulley 4 is rotated counterclockwise by a motor (not shown) for processing the workpiece W, the rotating face plate 5 rotates in the same direction, and the rotation of the rotating face plate 5 is supported. The work W is transmitted to the gripper 10 via the shaft 6 and
Is driven to rotate. At this time, since the rotational driving direction of the workpiece W tends to be eccentric in the clamping direction of the gripping claw 10 with respect to the workpiece W, a strong clamping state can be secured. Here, the swing face plate 7 is rotated together with the rotating face plate 5.
【００１５】次に、この工作物Ｗを回転駆動した状態か
ら工作物Ｗをアンクランプするためには、図略のモータ
を停止し、上述した状態と同様に円錐カム２１を２１ａ
の位置まで前進させて、アーム１８および揺動レバー１
３を作動させることにより把持爪１０を開き方向に旋回
させれば良い。Next, in order to unclamp the workpiece W from the state in which the workpiece W is rotationally driven, the motor (not shown) is stopped, and the conical cam 21 is moved to 21a in the same manner as described above.
To the arm 18 and the swing lever 1
By operating the grip 3, the gripping claw 10 may be turned in the opening direction.
【００１６】[0016]
【発明の効果】以上述べたように本発明の工作物把持装
置は、円錐カムの前進時に円錐カムと当接するローラを
平行リンク機構により点接触を保ちながら回転面板の径
方向に移動するように構成したので、ローラの移動量が
大きくなってもローラは円錐カムに対して滑りを生ずる
ことなく転動し、ローラに無理な荷重がかかる恐れがな
くなる。従って、把持爪のカム幅および旋回角度を大き
くすることが可能となり、クランプできる工作物の径範
囲を大きくすることができる。As described above, the workpiece gripping device of the present invention moves the roller abutting on the conical cam in the radial direction of the rotating face plate while maintaining point contact by the parallel link mechanism when the conical cam advances. With this configuration, even if the amount of movement of the roller increases, the roller rolls without causing slippage with respect to the conical cam, and there is no possibility that an excessive load is applied to the roller. Therefore, the cam width and the turning angle of the gripping claws can be increased, and the diameter range of the work that can be clamped can be increased.
【図１】本実施例の工作物把持装置の側面断面図であ
る。FIG. 1 is a side cross-sectional view of a workpiece holding device according to the present embodiment.
【図２】図１におけるＡ−Ａ矢視断面図である。FIG. 2 is a sectional view taken along the line AA in FIG.
【図３】図１におけるＢ矢視図である。FIG. 3 is a view taken in the direction of arrow B in FIG. 1;
１ 主軸台本体 ２ 固定軸 ４ 駆動プーリ ５ 回転面板 ６ 支持軸 ７ 揺動面板 １０ 把持爪 １１ 支軸 １２ バネ １３ 揺動レバー １５ 平行リンク機構 １６ リンク １７ 支持ピン １８ アーム １９ ローラ ２１ 円錐カム ２２ シリンダ ２９ 作動ロッド Reference Signs List 1 headstock body 2 fixed shaft 4 drive pulley 5 rotating face plate 6 support shaft 7 swing face plate 10 gripping claw 11 support shaft 12 spring 13 swing lever 15 parallel link mechanism 16 link 17 support pin 18 arm 19 roller 21 cone cam 22 cylinder 29 Operating rod
Claims (1)
と、この駆動部材に同心で固定された回転面板と、この
回転面板の中心部で前記駆動部材の回転軸線方向に進退
移動可能に配置された円錐カムと、前記回転面板の板面
に一端を回転可能に枢支された揺動レバーと、この揺動
レバーの他端に一端が回転可能に枢着され、前記円錐カ
ムの前進時に前記円錐カムと点接触で当接するとともに
前記円錐カムの径方向に移動されるローラが回転自在に
取り付けられたアームと、このアームの他端に一端が回
転可能に枢着されるとともに他端が前記回転面板の板面
に枢支されて前記アームおよび前記揺動レバーとによっ
て平行リンク機構を構成するリンクと、前記揺動レバー
の旋回に応じて開閉可能に枢支された把持爪と、この把
持爪を常に閉じ方向に付勢するバネと、前記円錐カムを
進退作動させる進退作動用アクチュエータと、前記駆動
部材を回転駆動するモータとを備えたことを特徴とする
工作把持装置。1. A driving member rotatably supported on a headstock, a rotating face plate fixed concentrically to the driving member, and a central portion of the rotating face plate capable of moving forward and backward in the rotation axis direction of the driving member. A conical cam arranged, a swinging lever pivotally supported at one end to the plate surface of the rotating face plate, and one end rotatably pivotally connected to the other end of the swinging lever, so that the conical cam advances. An arm having a roller rotatably attached to the conical cam, which is sometimes in point contact with the conical cam, and is rotatably mounted on the other end of the arm; Is the plate surface of the rotating face plate
Always closing direction and links are pivotally supported constitute a parallel link mechanism by said arm and said swing lever, and openably pivoted the gripping claws in accordance with the turning of the rocking lever, the gripping claws in A work gripping device comprising: a spring for biasing the conical cam; an actuator for advancing and retreating the conical cam; and a motor for rotating the driving member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29191493A JP3298271B2 (en) | 1993-11-22 | 1993-11-22 | Workpiece holding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29191493A JP3298271B2 (en) | 1993-11-22 | 1993-11-22 | Workpiece holding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07136814A JPH07136814A (en) | 1995-05-30 |
| JP3298271B2 true JP3298271B2 (en) | 2002-07-02 |
Family
ID=17775096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29191493A Expired - Fee Related JP3298271B2 (en) | 1993-11-22 | 1993-11-22 | Workpiece holding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3298271B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672227A (en) * | 2011-03-16 | 2012-09-19 | 贺自清 | Self-centering power chuck for star-shaped connecting rod |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100861710B1 (en) * | 2006-11-28 | 2008-10-06 | 김태석 | Clapping device for milling machine |
| CN107116243B (en) * | 2017-06-05 | 2018-11-23 | 广东长盈精密技术有限公司 | Fixture |
| KR102158603B1 (en) * | 2018-05-21 | 2020-09-22 | 희성촉매 주식회사 | Jig unit for catalyst support clamping |
-
1993
- 1993-11-22 JP JP29191493A patent/JP3298271B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672227A (en) * | 2011-03-16 | 2012-09-19 | 贺自清 | Self-centering power chuck for star-shaped connecting rod |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07136814A (en) | 1995-05-30 |
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