[發明所欲解決的課題] [0004] 上述之以往的技術在以下的觀點還留有改良的餘地。 上述的輸出構件與工件抵接時，在該抵接部分產生衝撃這點還有著改良的餘地。 本發明的目的，是緩和附倍力機構的壓缸裝置的輸出構件對按壓對象物賦予的衝撃。 [用以解決課題的手段] [0005] 為了達成上述目的，第1發明，例如圖1至圖2B、圖3A及圖3B、圖4A至圖5B所示般，使附倍力機構的壓缸裝置構成如下。 使第1活塞5可於軸方向移動地插入至殼體1。該第1活塞5，具有往軸方向形成的筒孔6。使第2活塞8可於軸方向移動地插入至前述筒孔6。倍力機構20，具有：在前述第1活塞5與前述第2活塞8之間於圓周方向空出既定間隔來配置的複數個卡合構件（卡合球22）。使將前述第1活塞5往軸方向按壓的力藉由倍力機構20來倍力變換並傳達至前述第2活塞8。使輸出構件29可於軸方向移動地連結於前述第2活塞8。該輸出構件29是在軸方向空出既定間隔L而可與前述第2活塞8抵接地相面對。在前述第2活塞8與前述輸出構件29之間所安裝的彈推手段（壓縮彈簧41），是往使前述第2活塞8與前述輸出構件29分開的方向來作用力。 [0006] 第1發明，發揮以下的作用效果。 上述的倍力機構在倍力驅動開始之前，是使第2活塞透過彈推手段與輸出構件來抵接於按壓對象物。因此，相較於前述的以往技術般，在倍力機構的倍力驅動行程途中，使第2活塞透過輸出構件抵接於按壓對象物的情況，本發明的壓缸裝置，可緩和輸出構件對按壓對象物賦予的衝撃。 [0007] 第1發明，以加上下述（1）及（4）的構造為佳。 （1）從前述殼體1的前端壁1a往基端側突出設置有導引筒3。前述倍力機構20，具備：支撐筒21、卡合構件（卡合球22）、凸輪面24、按壓面27。支撐孔21是於圓周方向空出既定間隔來往半徑方向貫通前述導引筒3的筒壁3a。於前述支撐孔21插入有前述卡合構件（卡合球22）。凸輪面24可卡合於前述卡合構件（卡合球22），該凸輪面24在前述第2活塞8的外周是形成為隨著朝向基端側而接近軸心。按壓面27可卡合於前述卡合構件（卡合球22），該按壓面27在前述第1活塞5的前述筒孔6是形成為隨著朝向基端側而接近軸心。 此情況時，在上述倍力機構的倍力驅動時，往前端側按壓第1活塞的力，會透過按壓面與卡合構件與凸輪面來倍力變換並確實傳達至第2活塞。 [0008] （2）藉由前述第1活塞5及前述第2活塞8使前述殼體1內於軸方向被區隔成鎖固室15與釋放室16。於前述鎖固室15及前述釋放室16供給排出有壓力流體。安裝於前述鎖固室15的固定彈簧19，是將前述第1活塞5往前端側彈推。 此情況時，在上述倍力機構的倍力驅動時，相當於鎖固室之壓力流體之壓力的按壓力與固定彈簧的按壓力之合力，會透過第1活塞與倍力機構與第2活塞與輸出構件來將按壓對象物往前端側強力地按壓。 [0009] （3）在前述第2活塞8的前端部朝向前端側來開口的安裝孔10a處，插入有前述輸出構件29的基端部。於前述安裝孔10a安裝有前述彈推手段（壓縮彈簧41）。 此情況時，彈推手段是相對於第2活塞確實地將輸出構件往前端側彈推。 [0010] （4）前述第2活塞8形成為環狀。使前述輸出構件29可於軸方向移動地插入至前述第2活塞8的筒孔51。前述輸出構件29的基端部是可被承接地與前述殼體1的基端壁1b相面對。 此情況時，在壓缸裝置的釋放狀態下，輸出構件可確實地被殼體的基端壁給承接。 [0011] 第2發明，例如圖3A及圖3B、圖4A至圖5B所示般，使附倍力機構的壓缸裝置構成如下。 使第1活塞5可於軸方向移動地插入至殼體1。該第1活塞5，具有往軸方向形成的筒孔6。使環狀的第2活塞8可於軸方向移動地插入至前述筒孔6。使將前述第1活塞5往軸方向按壓的力藉由倍力機構20來倍力變換並傳達至前述第2活塞8。該倍力機構20，具有：在前述第1活塞5與前述第2活塞8之間於圓周方向空出既定間隔來配置的複數個卡合構件（卡合球22）。可往軸方向移動地插入至前述第2活塞8之筒孔51的輸出構件29，是在軸方向空出既定間隔L而可與前述第2活塞8抵接地相面對。藉由設在前述殼體1的基端壁1b與前述輸出構件29之間的彈推手段56，使前述輸出構件29往前端側移動。 [0012] 第2發明，發揮以下的作用效果。 上述的倍力機構在倍力驅動開始之前，是使第2活塞透過彈推手段與輸出構件來抵接於按壓對象物。因此，相較於前述的以往技術般，在倍力機構的倍力驅動行程途中，使第2活塞透過輸出構件抵接於按壓對象物的情況，本發明的壓缸裝置，可緩和輸出構件對按壓對象物賦予的衝撃。 [0013] 第2發明，以加上下述（5）至（7）的構造為佳。 （5）前述輸出構件29的基端部是可被承接地與前述殼體1的基端壁1b相面對。 此情況時，在壓缸裝置的釋放狀態下，輸出構件可確實地被殼體的基端壁給承接。 [0014] （6）前述輸出構件29是構成為可透過前述第2活塞8來被前述殼體1的基端壁1b給承接。 此情況時，在壓缸裝置的釋放狀態下，輸出構件可確實地透過前述第2活塞被殼體的基端壁給承接。 [0015] （7）在前述第2活塞8與前述輸出構件29之間安裝有彈推手段（壓縮彈簧41），藉由前述彈推手段（壓縮彈簧41）來彈推使前述第2活塞8與前述輸出構件29分離。 此情況時，藉由設在殼體的基端壁與輸出構件之間的彈推手段、以及安裝在第2活塞與輸出構件之間的彈推手段，來確實地將前述第2活塞與前述輸出構件往分離方向彈推。 （8）藉由前述第1活塞（5）、前述第2活塞（8）、及前述輸出構件（29），使前述殼體（1）內在軸方向被區隔成鎖固室（15）與釋放室（16），於前述鎖固室（15）及前述釋放室（16）供給排出有壓力流體，前述輸出構件（29）的受壓面積（S1），是設定成比前述第2活塞（8）之環狀受壓部分的受壓面積（S2）還要寬廣。 此情況時，以鎖固室的壓縮空氣將輸出構件往上方移動的推力，是變得比以鎖固室的壓縮空氣將第2活塞往上方按壓的力還要大。因此，輸出構件會比第2活塞還要先往上方被鎖固室的壓縮空氣給推動。[Problem to be Solved by the Invention] [0004] The above-mentioned conventional technology still leaves room for improvement from the following viewpoints. When the above-mentioned output member abuts against the workpiece, there is room for improvement in that a shock occurs at the abutting part. The object of the present invention is to alleviate the impact that the output member of the cylinder device with a double force mechanism exerts on the pressing object. [Means to Solve the Problem] [0005] In order to achieve the above object, the first invention, for example, as shown in Figs. 1 to 2B, 3A and 3B, and Figs. The device configuration is as follows. "" The first piston 5 is inserted into the housing 1 so as to be movable in the axial direction. The first piston 5 has a cylindrical hole 6 formed in the axial direction. The second piston 8 is inserted into the cylindrical hole 6 so as to be movable in the axial direction. The double force mechanism 20 includes a plurality of engagement members (engagement balls 22) arranged at a predetermined interval in the circumferential direction between the first piston 5 and the second piston 8. The force that pushes the first piston 5 in the axial direction is converted to the force by the multiplying mechanism 20 and transmitted to the second piston 8. The output member 29 is connected to the second piston 8 described above so as to be movable in the axial direction. The output member 29 has a predetermined interval L in the axial direction and can abut against and face the second piston 8 described above. The urging means (compression spring 41) installed between the second piston 8 and the output member 29 biases the second piston 8 and the output member 29 in a direction. [0006] The first invention exerts the following functions and effects. The above-mentioned double-force mechanism causes the second piston to abut against the pressing object through the elastic pushing means and the output member before the double-force drive starts. Therefore, compared to the aforementioned prior art, when the second piston is made to abut the pressing object through the output member during the double-force drive stroke of the double-force mechanism, the cylinder device of the present invention can alleviate the pairing of the output member. Press the impact given by the object. [0007] The first invention is preferably a structure in which the following (1) and (4) are added. (1) A guide tube 3 is provided protruding from the front end wall 1a of the housing 1 toward the base end side. The aforementioned double force mechanism 20 includes a support tube 21, an engagement member (engagement ball 22 ), a cam surface 24, and a pressing surface 27. The support hole 21 penetrates the tube wall 3a of the guide tube 3 in the radial direction with a predetermined interval in the circumferential direction. The aforementioned engagement member (engagement ball 22) is inserted into the aforementioned support hole 21. The cam surface 24 can be engaged with the aforementioned engagement member (engagement ball 22), and the cam surface 24 is formed on the outer periphery of the aforementioned second piston 8 so as to approach the axis as it goes to the proximal side. The pressing surface 27 can be engaged with the engagement member (the engagement ball 22), and the pressing surface 27 is formed in the cylindrical hole 6 of the first piston 5 so as to approach the axis as it goes to the proximal side. In this case, during the double force driving of the above-mentioned double force mechanism, the force pressing the first piston toward the front end side is converted to double force through the pressing surface, the engagement member and the cam surface, and is surely transmitted to the second piston. [0008] (2) The housing 1 is partitioned into a lock chamber 15 and a release chamber 16 in the axial direction by the first piston 5 and the second piston 8. The lock chamber 15 and the release chamber 16 are supplied and discharged with pressurized fluid. The fixed spring 19 attached to the lock chamber 15 urges the first piston 5 toward the front end side. In this case, when the above-mentioned double-force mechanism is driven by the double-force, the combined force of the pressing force corresponding to the pressure of the pressure fluid in the lock chamber and the pressing force of the fixed spring will pass through the first piston, the double-force mechanism and the second piston Together with the output member, the pressing object is strongly pressed toward the tip side. [0009] (3) The base end of the output member 29 is inserted into the mounting hole 10a where the front end of the second piston 8 opens toward the front end. The elastic pushing means (compression spring 41) is attached to the attachment hole 10a. In this case, the spring pushing means reliably pushes the output member toward the front end with respect to the second piston. [0010] (4) The second piston 8 is formed in a ring shape. The output member 29 is inserted into the cylindrical hole 51 of the second piston 8 so as to be movable in the axial direction. The base end portion of the output member 29 can be supported to face the base end wall 1b of the housing 1. "In this case, in the released state of the cylinder device, the output member can be reliably received by the base end wall of the housing." [0011] In the second invention, for example, as shown in FIGS. 3A and 3B, and FIGS. 4A to 5B, a cylinder device with a double force mechanism is configured as follows. "" The first piston 5 is inserted into the housing 1 so as to be movable in the axial direction. The first piston 5 has a cylindrical hole 6 formed in the axial direction. The ring-shaped second piston 8 is inserted into the cylindrical hole 6 so as to be movable in the axial direction. The force that pushes the first piston 5 in the axial direction is converted to the force by the multiplying mechanism 20 and transmitted to the second piston 8. This multiplying mechanism 20 has a plurality of engagement members (engagement balls 22) arranged at predetermined intervals in the circumferential direction between the first piston 5 and the second piston 8. The output member 29 inserted into the cylindrical hole 51 of the second piston 8 movably in the axial direction has a predetermined interval L in the axial direction and can abut against and face the second piston 8. The output member 29 is moved to the front end side by the elastic pushing means 56 provided between the base end wall 1b of the housing 1 and the output member 29. [0012] The second invention exerts the following functions and effects. The above-mentioned double-force mechanism causes the second piston to abut against the pressing object through the elastic pushing means and the output member before the double-force drive starts. Therefore, compared to the aforementioned prior art, when the second piston is made to abut the pressing object through the output member during the double-force drive stroke of the double-force mechanism, the cylinder device of the present invention can alleviate the pairing of the output member. Press the impact given by the object. [0013] The second invention is preferably a structure in which the following (5) to (7) are added. (5) The base end portion of the output member 29 can be supported to face the base end wall 1b of the housing 1. "In this case, in the released state of the cylinder device, the output member can be reliably received by the base end wall of the housing." [0014] (6) The output member 29 is configured to be received by the base end wall 1b of the housing 1 through the second piston 8. "In this case, in the released state of the cylinder device, the output member can be reliably received by the base end wall of the housing through the second piston. [0015] (7) An elastic pushing means (compression spring 41) is installed between the second piston 8 and the output member 29, and the second piston 8 is pushed by the elastic pushing means (compression spring 41). It is separated from the aforementioned output member 29. In this case, the elastic pushing means provided between the base end wall of the housing and the output member, and the elastic pushing means installed between the second piston and the output member, reliably connect the second piston to the output member. The output member bounces toward the separation direction. (8) By means of the first piston (5), the second piston (8), and the output member (29), the housing (1) is partitioned in the axial direction into a lock chamber (15) and The release chamber (16) supplies and discharges pressure fluid to the lock chamber (15) and the release chamber (16). The pressure receiving area (S1) of the output member (29) is set to be larger than that of the second piston ( 8) The pressure-receiving area (S2) of the ring-shaped pressure-receiving part should be wider. In this case, the pushing force for moving the output member upward with the compressed air in the lock chamber becomes greater than the force with which the compressed air in the lock chamber pushes the second piston upward. Therefore, the output member is pushed upward by the compressed air in the lock chamber before the second piston.
[0017] 圖1至圖2B，表示本發明的第1實施形態。該第1實施形態，示例出將工件（按壓對象物）W從下方往上推起之附倍力機構的壓缸裝置。首先，藉由圖1，說明附倍力機構的壓缸裝置的構造。 [0018] 上述附倍力機構的壓缸裝置的殼體1，是藉由複數個螺栓（未圖示），而被固定在作為固定台的桌台T。該殼體1具有：上端壁（前端壁）1a、下端壁（基端壁）1b、胴部1c。 [0019] 在上述殼體1內使缸體孔2於上下方向（軸方向）形成。在該缸體孔2內使導引筒3從上端壁1a往下方突出設置。使倍力用的第1活塞5可於上下方向移動地以密封狀插入至缸體孔2。筒孔6於上下方向貫通於第1活塞5，使第2活塞8可於上下方向移動地以密封狀態插入至該筒孔6。 [0020] 上述的第2活塞8，具有：插入至第1活塞5之筒孔6的活塞本體9、以及從該活塞本體9往上方一體地突出設置的活塞桿10。在該活塞桿10的外周部所設置的導引面11，是插入至導引筒3的筒孔12內。從活塞桿10的外周部使銷13往半徑方向的外側突出設置。該銷13，是插入至在導引筒3的筒壁3a往上下方向形成的導引槽14。藉此，使第2活塞8相對於殼體1的導引筒3被往上下方向導引，並且防止旋轉。 [0021] 藉由上述的第1活塞5及第2活塞8使殼體1的內部空間被區隔成2個室。於第1活塞5及第2活塞8的下側形成有鎖固室15，並於第1活塞5及第2活塞8的上側形成有釋放室16。於鎖固室15進行壓縮空氣（壓力流體）的供給及排出的供給排出路17，是形成在殼體1的上端壁1a及胴部1c，於釋放室16進行壓縮空氣（壓力流體）的供給及排出之其他的供給排出路18是形成在殼體1的上端壁1a。且，於鎖固室15安裝有固定彈簧19，該固定彈簧19是將第1活塞5往上方彈推。 [0022] 在上述釋放室16內配置有倍力機構20。該倍力機構20，是構成為將以鎖固室15的壓縮空氣使第1活塞5往上方（釋放室16側）按壓的力予以倍力變換並傳達至第2活塞8。 [0023] 上述倍力機構20，是構成如下。 支撐孔21是於圓周方向空出既定間隔來往半徑方向貫通上述導引筒3之筒壁3a的下部。卡合球（卡合構件）22是可於半徑方向移動地插入至支撐孔21。與上述卡合球22對應地在活塞桿10的外周部形成有凸輪槽23。於該凸輪槽23的底壁所形成的凸輪面24，是形成為隨著朝向下方而接近軸心（直徑變小）。使卡合球22可抵接於該凸輪面24。且，在第1活塞5之筒孔6的上半部分使按壓面27形成為隨著朝向下方而接近軸心。卡合球22可抵接於該按壓面27。 [0024] 在上述按壓面27的上側使筒孔6的按壓部28形成為隨著朝向鎖固室15側而逐漸接近軸心。藉此，在倍力機構20的倍力驅動開始時，按壓部28會將卡合球22往半徑方向的內側推出。且，從壓缸裝置之鎖固驅動的開始時到倍力機構20之倍力驅動開始的前一刻為止的鎖固驅動步驟，按壓部28會將卡合球22朝向活塞桿10的導引面11來往半徑方向的內側按壓。又，以按壓部28將卡合球22往半徑方向的內側按壓的力，是設定成比以按壓面27將卡合球22往半徑方向的內側按壓的力還要小。 [0025] 使輸出構件29可於上下方向移動地連結於上述活塞桿10。在此，本實施形態中，輸出構件29是藉由夾桿30所構成。於該活塞桿10的上面使安裝孔10a朝向上方開口，使夾桿30的短徑部30a可於上下方向移動地插入至該安裝孔10a。於夾桿30之短徑部30a的上側形成有長徑部30b。使該長徑部30b以密封狀態插入至導引筒3的筒孔12。於活塞桿10的上面形成有卡合部33。在夾桿30之長徑部30b的下端面形成有可與該卡合部33抵接的卡止部34。從活塞桿10之安裝孔10a的周壁，使銷37往半徑方向的內側突出設置。該銷37，是插入至在夾桿30的短徑部30a往上下方向形成的38。且，在夾桿30的上端面所形成的按壓部40，可抵接於工件（按壓對象物）W的下面。 [0026] 在上述活塞桿10的安裝孔10a內安裝有壓縮彈簧（彈推手段）41。該壓縮彈簧41是相對於活塞桿10來將夾桿30往上方彈推，使夾桿30之長孔38的下端面被活塞桿10的銷37給承接。藉此，使活塞桿10的卡合部33與夾桿30的卡止部34成為空出既定間隔L且可抵接地相面對。 [0027] 上述第1實施形態所示的壓缸裝置，是如圖1至圖2B所示般，進行以下動作。 在圖1的釋放狀態中，是從鎖固室15排出壓縮空氣，並對釋放室16供給壓縮空氣。藉此，釋放室16的壓縮空氣會讓第1活塞5及第2活塞8下降到下限位置。 在上述釋放狀態中將工件W搬入至夾桿30的上方，使該工件W被載置在從桌台T往上方突出設置的支撐銷42上。 [0028] 在將上述壓缸裝置從圖1的釋放狀態往圖2B的鎖固狀態進行鎖固驅動時，是從釋放室16排出壓縮空氣，並對鎖固室15供給壓縮空氣。如此一來，鎖固室15的壓縮空氣會使第2活塞8往上方移動。在該狀態中，活塞桿10的導引面11會阻止卡合球22往半徑方向之內側的移動，第1活塞5的按壓部28會透過卡合球22而被導引筒3之支撐孔21的上壁給承接（亦即，使第1活塞5透過卡合球22連結於導引筒3），故阻止第1活塞5的上升。且，如圖2A所示般，第2活塞8，會留下第1活塞5以低負載來上升既定行程。如此一來，第2活塞8會透過壓縮彈簧41來使夾桿30上升。藉此，夾桿30的按壓部40會抵接於工件W的下面。其結果，夾桿30雖被工件W給承接，但第2活塞8會抵抗壓縮彈簧41的彈推力而逐漸上升。 [0029] 接著，第2活塞8往上方移動，使得第2活塞8的凸輪面24上升到卡合球22的高度位置。如此一來，會容許卡合球22往半徑方向之內側的移動。接著，相當於鎖固室15之壓縮空氣之壓力的按壓力及固定彈簧19的彈推力之合力，會透過第1活塞5的按壓部28使卡合球22往半徑方向的內側移動，來使卡合球22按壓凸輪面24。藉此，第1活塞5與導引筒3（殼體1）之間的連結被解除，並且使第1活塞5透過卡合球22與第2活塞8連結。接著，第1活塞5，是透過按壓面27與卡合球22與凸輪面24來使第2活塞8抵抗前述壓縮彈簧41的彈推力來往上方移動。如此一來，如圖2B所示般，活塞桿10的卡合部33會抵接於夾桿30的卡止部34。藉此，第2活塞8會透過夾桿30來從下方按壓並支撐工件W。其結果，使壓缸裝置從釋放狀態切換至鎖固狀態。 [0030] 在上述鎖固狀態中，即使因某種原因使得鎖固室15的壓力降低或是消失時，亦可使固定彈簧19之往上方的彈推力透過倍力機構20（按壓面27、卡合球22、凸輪面24）的卡榫作用來機械性地保持鎖固狀態，故可確實地維持該鎖固狀態。 [0031] 在將上述壓缸裝置從圖2B的鎖固狀態切換至圖1的釋放狀態時，是在該圖2B的鎖固狀態，從鎖固室15排出壓縮空氣，並對釋放室16供給壓縮空氣，從而以釋放室16的壓縮空氣來使第1活塞5逐漸下降。如此一來，會容許卡合球22往半徑方向之外側的移動。接著，以釋放室16的壓縮空氣使第2活塞8下降，並以該第2活塞8的凸輪面24將卡合球22往半徑方向的外側推動。如此一來，第1活塞5會藉由下端壁1b被從下方承接，幾乎與此同時地，上述活塞桿10的導引面11會阻止卡合球22往半徑方向之內側的移動。於是，使第1活塞5與第2活塞8之間的連結狀態被解除，並且使上述第1活塞5透過卡合球22來被導引筒3之支撐孔21的周壁給承接，而阻止該第1活塞5的上升。之後，相對於上下方向的移動被阻止的第1活塞5，使第2活塞8進一步下降。如此一來，活塞桿10的銷37會抵接於夾桿30之長孔38的下端壁，從而以第2活塞8使夾桿30往下方移動。接著，該第2活塞8的下端面會被殼體1的下端壁1b給承接。藉此，使壓缸裝置從鎖固狀態切換成釋放狀態。 [0032] 第1實施形態是發揮以下的優點。 上述第1實施形態中，在倍力機構20的倍力驅動開始之前，第2活塞8是透過壓縮彈簧41與夾桿30來抵接於工件W。因此，相較於前述的以往技術般，在倍力機構的倍力驅動行程途中，使夾桿抵接於工件的情況，本實施形態的壓缸裝置，可緩和夾桿30對工件W賦予的衝撃。 [0033] 圖3A及圖3B或圖4A至圖5B，表示本發明的第2實施形態或第3實施形態，對於與上述第1實施形態的構成構件相同的構件（或類似的構件），原則上附上相同的參考符號來進行說明。舉例表示適用該第2實施形態之附倍力機構的壓缸裝置之連桿式夾緊裝置。 [0034] 圖3A及圖3B所示的第2實施形態與上述第1實施形態不同的點如下。 在前述夾桿30的上端部於水平方向形成有插通孔，並在夾臂44的左端部於水平方向形成有插通孔。對該夾桿30的插通孔與夾臂44的插通孔插入有連結銷。藉此，使夾臂44的左端部可在垂直面內擺動地連結於夾桿30的上端部。且，在夾桿30的右側於殼體1的上端壁1a使樞軸部45往上方突出設置。使連桿構件46的下端部可擺動地連結於該樞軸部45。使連桿構件46的上端部可擺動地連結於該夾臂44之長度方向的途中部。於夾臂44的右端部安裝有按壓件48。於該按壓件48的下端部形成有按壓部48a，使該按壓部48a可抵接於工件W。 又，本實施形態中，是藉由夾桿30與夾臂44來構成輸出構件29。 [0035] 如圖3A所示般，第2活塞8形成為環狀，使夾桿30可於上下方向移動地以密封狀態插入至該第2活塞8的筒孔51。該夾桿30的下端面可抵接於殼體1的下端壁1b。藉此，在釋放狀態中，釋放室16的壓縮空氣會透過第2活塞8來將夾桿30的下桿53往下限位置推動，使該下桿53的下端面被殼體1的下端壁1b給承接。其結果，在釋放狀態下，夾桿30，其上下方向的移動被阻止，而確實維持釋放狀態。 [0036] 第2實施形態是發揮以下的優點。 上述第2實施形態中，在倍力機構20的倍力驅動開始之前，第2活塞8是透過壓縮彈簧41與輸出構件29（夾桿30與夾臂44）來抵接於工件W。因此，相較於前述的以往技術般，在倍力機構的倍力驅動行程途中，使夾桿抵接於工件的情況，本實施形態的壓缸裝置，可緩和輸出構件29對工件W賦予的衝撃。 [0037] 圖4A至圖5B，表示本發明的第3實施形態，該第3實施形態與上述第1實施形態及第2實施形態不同的點如下。 本實施形態的壓缸裝置，如圖4A所示般，是使筒狀的第2活塞8可於上下方向移動地以密封狀態插入至第1活塞5的筒孔6。於第2活塞8貫通有上下方向的筒孔51。使輸出構件29的夾桿30可於上下方向移動地以密封狀態插入至該筒孔51。第2活塞8的下端面可抵接於殼體1的下端壁1b。且，在構成前述筒孔51之一部分的安裝孔10a，安裝有壓縮彈簧（彈推手段）41。 [0038] 上述夾桿30是插入至導引筒3的筒孔12內。在該筒孔12的內周壁所形成的凹部，使球54往半徑方向的內側突出設置地來安裝。該球54，是插入至在活塞桿10的外周壁往上下方向形成的導引槽55。藉此，使第2活塞8可相對於殼體1的導引筒3往上下方向移動且防止旋轉。 [0039] 藉由上述第1活塞5與第2活塞8與夾桿30使缸體孔2被區隔成上下2個室。於第1活塞5與第2活塞8與夾桿30的下側形成有鎖固室15，並於第1活塞5與第2活塞8與夾桿30的上側形成有釋放室16。 [0040] 上述夾桿30，具有：插入至導引筒3之筒孔12的桿本體52、以及比桿本體52還要長徑地形成在該桿本體52之下側的下桿53。上述鎖固室15或釋放室16之壓縮空氣的壓力是作用於下桿53，該下桿53之受壓部分的受壓面積S1，是被設定成比第2活塞8之環狀受壓部分的受壓面積S2還要寬廣。因此，以鎖固室15的壓縮空氣將夾桿30往上方移動的推力，是變得比以鎖固室15的壓縮空氣將第2活塞8往上方按壓的力還要大。因此，夾桿30會比第2活塞8還要先往上方（下方）被鎖固室15（或釋放室16）的壓縮空氣給推動。本實施形態中，相對於第2活塞8使夾桿30往上方移動的彈推手段56，是藉由鎖固室15與供給至該鎖固室15的壓縮空氣來構成。 在此，彈推手段56，亦可取代由鎖固室15等所構成者，而採用安裝在夾桿30的下端面與殼體1的下端壁1b之間的壓縮彈簧。 [0041] 且，上述第3實施形態的壓缸裝置中，亦可省略上述的壓縮彈簧41。此情況時，是對作為彈推手段56的鎖固室15供給壓縮空氣，藉此使相當於該壓縮空氣之壓力的推力作用於該夾桿30，使得夾桿30比第2活塞8還要先往上方移動。 [0042] 上述第3實施形態所示的壓缸裝置，是如圖4A至圖5B所示般，進行以下動作。 在圖4A的釋放狀態中，是從鎖固室15排出壓縮空氣，並對釋放室16供給壓縮空氣。藉此，釋放室16的壓縮空氣會讓第1活塞5與第2活塞8與夾桿30移動到下限位置。 在上述釋放狀態中從夾桿30的上方藉由搬送機構（未圖示）將工件W搬入，並將該工件W載置在桌台T上。 [0043] 在將上述壓缸裝置從圖4A的釋放狀態往圖5B的鎖固狀態進行鎖固驅動時，是從釋放室16排出壓縮空氣，並對鎖固室15供給壓縮空氣。如此一來，鎖固室15的壓縮空氣會將夾桿30與第1活塞5與第2活塞8往上方按壓。在該狀態中，活塞桿10的導引面11會阻止卡合球22往半徑方向之內側的移動，第1活塞5的按壓部28會透過卡合球22而被導引筒3之支撐孔21的上壁給承接（亦即，使第1活塞5透過卡合球22連結於導引筒3），故阻止第1活塞5的上升。且，第1活塞5是透過卡合球22來按壓活塞桿10的導引面11，故第2活塞8，會抵抗卡合球22與導引面11之間產生的摩擦力來逐漸上升。如此一來，藉由相當於鎖固室15之壓縮空氣之壓力的按壓力與壓縮彈簧41的彈推力，使夾桿30比第2活塞8還要先往上方移動。接著，如圖5A所示般，使夾桿30之下桿53的上面53a抵接於筒孔51之長徑孔的頂壁51a的話，夾桿30與第2活塞8會成為一體來往上方移動。如此一來，夾臂44的按壓部44a會抵接於工件W的上面。接著，第2活塞8會抵抗壓縮彈簧41的彈推力而逐漸上升。 [0044] 接著，當第2活塞8的凸輪面24上升至對面卡合球22的高度位置為止時，會容許卡合球22往半徑方向之內側的移動。然後，相當於鎖固室15之壓縮空氣之壓力的按壓力及固定彈簧19的彈推力之合力，會使第1活塞5上升，且該第1活塞5會透過按壓部28來使卡合球22往半徑方向的內側移動，進一步，使卡合球22按壓凸輪面24。藉此，第1活塞5透過卡合球22連結於導引筒3（殼體1）的狀態被解除，並且使第1活塞5透過卡合球22來連結於第2活塞8。藉此，第1活塞5會透過卡合球22來使第2活塞8往上方移動。如此一來，如圖5B所示般，活塞桿10的卡合部33會抵接於夾桿30的卡止部34。藉此，第2活塞8會透過倍力機構20與夾桿30與夾臂44來從上方按壓工件W。其結果，使壓缸裝置從釋放狀態切換至鎖固狀態。 [0045] 在上述鎖固狀態中，即使因某種原因使得鎖固室15的壓力降低或是消失時，亦可使固定彈簧19之往上方的彈推力透過倍力機構20（按壓面27、卡合球22、凸輪面24）的卡榫作用來機械性地保持鎖固狀態，故可確實地維持該鎖固狀態。 [0046] 在將上述壓缸裝置從圖5B的鎖固狀態切換至圖4A的釋放狀態時，是在該圖5B的鎖固狀態，從鎖固室15排出壓縮空氣，並對釋放室16供給壓縮空氣，從而以釋放室16的壓縮空氣來抵抗固定彈簧19之往上方的彈推力使第1活塞5下降。如此一來，會容許卡合球22往半徑方向之外側的移動。接著，以釋放室16的壓縮空氣使第2活塞8下降，並以該第2活塞8的凸輪面24將卡合球22往半徑方向的外側推動。此時，壓縮彈簧41是相對於第2活塞8將夾桿30往上方彈推，故夾桿30會留在上限位置。接著，使筒孔51之長徑孔的頂壁51a抵接於夾桿30之下桿53的上面53a的話，第2活塞8與夾桿30會成為一體來往下方移動。接著，第1活塞5會從下方從被下端壁1b給承接，幾乎與此同時地，上述活塞桿10的導引面11會將卡合球22往半徑方向的外側推出。於是，使第1活塞5與第2活塞8之間的連結狀態被解除，並且使上述第1活塞5透過卡合球22來被導引筒3之支撐孔21的周壁給承接。藉此，使該第1活塞5的上升被阻止。之後，若第2活塞8與夾桿30進一步下降的話，第2活塞8的下端面會從下方被殼體1的下端壁1b給承接。此外，夾桿30會將壓縮彈簧41按壓縮短有距離L，而使夾桿30的卡合部33從下方被活塞桿10的卡止部34給承接。藉此，使壓缸裝置從鎖固狀態切換成釋放狀態。 [0047] 不過，上述第1、2實施形態的壓缸裝置中，在使夾桿30往下限位置移動後的釋放狀態中，第2活塞8與夾桿30是藉由壓縮彈簧41來分離既定距離L。 相對於此，上述第3實施形態的壓缸裝置中，在釋放狀態下，夾桿30是將壓縮彈簧41按壓縮短有距離L，來抵接於第2活塞8。因此，釋放狀態之壓缸裝置的高度尺寸，在與第1、2實施形態之壓缸裝置的高度尺寸相比之下，可至少縮短有距離L。 [0048] 上述各實施形態，可進行如下變更。 上述壓缸裝置的設置姿勢，亦可與示例過的姿勢成為上下顛倒的姿勢，或是以橫向的姿勢、或是以斜向的姿勢來設置亦可。 上述第2活塞8，並不限定於藉由活塞本體9與活塞桿10來構成，亦可省略活塞桿。此情況時，凸輪槽23及凸輪面是形成在活塞本體9的外周面，且安裝孔10a是形成在活塞本體9的上端部。 上述卡合球22的設置數量，以3個或4個為佳，但亦可
上午 11:15 2018/5/3
為2個或5個以上。 上述卡合球22所插入的支撐孔21，亦可在導引筒3的筒壁3a，將往水平方向貫通取代成往傾斜方向貫通。 上述卡合構件，並不限定於示例的卡合球22，例如，亦可為圓柱形的輥子等之其他形狀的構件。 本發明的壓缸裝置所使用的壓力流體，亦可取代示例的壓縮空氣，改成其他的壓縮氣體或液壓油等的液體。 上述的彈推手段，亦可取代示例的壓縮彈簧41，改成橡膠或樹脂等之彈性構件，或是氣彈簧亦可。 其他，在本業業者所想得到的範圍內當然能進行各種變更。[0017] FIGS. 1 to 2B show the first embodiment of the present invention. The first embodiment exemplifies a press cylinder device with a double force mechanism that pushes up a work (pressing object) W from below. First, with reference to FIG. 1, the structure of a cylinder device with a double force mechanism will be described. [0018] The housing 1 of the cylinder device with double force mechanism described above is fixed to a table T as a fixed table by a plurality of bolts (not shown). The housing 1 has an upper end wall (front end wall) 1a, a lower end wall (base end wall) 1b, and a body portion 1c. [0019] The cylinder hole 2 is formed in the above-mentioned housing 1 in the vertical direction (axial direction). In the cylinder hole 2, the guide tube 3 is protruded downward from the upper end wall 1a. The first piston 5 for double force is inserted into the cylinder hole 2 in a sealed manner so as to be movable in the vertical direction. The cylindrical hole 6 penetrates the first piston 5 in the vertical direction, and the second piston 8 is inserted into the cylindrical hole 6 in a sealed state so as to be movable in the vertical direction. [0020] The above-mentioned second piston 8 has a piston body 9 inserted into the cylindrical hole 6 of the first piston 5, and a piston rod 10 integrally protruding upward from the piston body 9. The guide surface 11 provided on the outer periphery of the piston rod 10 is inserted into the cylindrical hole 12 of the guide cylinder 3. From the outer peripheral portion of the piston rod 10, the pin 13 is provided to protrude outward in the radial direction. The pin 13 is inserted into the guide groove 14 formed in the cylinder wall 3a of the guide cylinder 3 in the vertical direction. Thereby, the second piston 8 is guided upward and downward with respect to the guide tube 3 of the housing 1, and rotation is prevented. [0021] The internal space of the housing 1 is divided into two chambers by the first piston 5 and the second piston 8 described above. A lock chamber 15 is formed on the lower side of the first piston 5 and the second piston 8, and a release chamber 16 is formed on the upper side of the first piston 5 and the second piston 8. The supply and discharge path 17 for supplying and discharging compressed air (pressurized fluid) in the lock chamber 15 is formed on the upper end wall 1a and the body portion 1c of the housing 1, and the compressed air (pressurized fluid) is supplied in the release chamber 16. The other supply and discharge path 18 for discharge is formed on the upper end wall 1 a of the casing 1. In addition, a fixed spring 19 is attached to the lock chamber 15 and the fixed spring 19 urges the first piston 5 upward. [0022] A double force mechanism 20 is arranged in the release chamber 16 described above. This multiplying mechanism 20 is configured to multiply the force of pressing the first piston 5 upward (the release chamber 16 side) by the compressed air of the lock chamber 15 and transmit it to the second piston 8. [0023] The above-mentioned double force mechanism 20 is configured as follows. The "support hole 21" penetrates the lower part of the cylinder wall 3a of the guide cylinder 3 in the radial direction with a predetermined interval in the circumferential direction. The engagement ball (engagement member) 22 is inserted into the support hole 21 movably in the radial direction. A cam groove 23 is formed in the outer peripheral portion of the piston rod 10 corresponding to the aforementioned engagement ball 22. The cam surface 24 formed on the bottom wall of the cam groove 23 is formed so as to approach the shaft center (the diameter becomes smaller) as it goes downward. The engaging ball 22 can abut against the cam surface 24. In addition, in the upper half of the cylindrical hole 6 of the first piston 5, the pressing surface 27 is formed so as to approach the axis as it goes downward. The engaging ball 22 can abut against the pressing surface 27. [0024] On the upper side of the pressing surface 27, the pressing portion 28 of the cylinder hole 6 is formed so as to gradually approach the axis as it goes to the lock chamber 15 side. Thereby, when the double-force drive of the double-force mechanism 20 starts, the pressing portion 28 pushes out the engagement ball 22 toward the inner side in the radial direction. And, from the start of the locking drive of the press cylinder device to the moment before the start of the double force drive of the double force mechanism 20, the pressing portion 28 will move the engagement ball 22 toward the guide surface of the piston rod 10 11 Press to and from the inside in the radial direction. In addition, the force with which the pressing portion 28 presses the engagement ball 22 to the radial inside is set to be smaller than the force with which the pressing surface 27 presses the engagement ball 22 to the radial inside. [0025] The output member 29 is connected to the piston rod 10 so as to be movable in the vertical direction. Here, in this embodiment, the output member 29 is constituted by the clamp rod 30. The mounting hole 10a is opened upward on the upper surface of the piston rod 10, and the short-diameter portion 30a of the clamp rod 30 is inserted into the mounting hole 10a so as to be movable in the vertical direction. The long diameter part 30b is formed on the upper side of the short diameter part 30a of the clamp rod 30. As shown in FIG. The long diameter portion 30b is inserted into the tube hole 12 of the guide tube 3 in a sealed state. An engaging portion 33 is formed on the upper surface of the piston rod 10. On the lower end surface of the long-diameter portion 30 b of the clamp rod 30, a locking portion 34 that can abut against the engaging portion 33 is formed. From the peripheral wall of the mounting hole 10a of the piston rod 10, the pin 37 is protruded inward in the radial direction. The pin 37 is inserted into the short-diameter portion 30a of the clamp rod 30 and formed in the vertical direction 38. In addition, the pressing portion 40 formed on the upper end surface of the clamp lever 30 can abut against the lower surface of the workpiece (the pressing object) W. [0026] A compression spring (elastic pushing means) 41 is installed in the mounting hole 10a of the piston rod 10 described above. The compression spring 41 urges the clamp rod 30 upward with respect to the piston rod 10 so that the lower end surface of the long hole 38 of the clamp rod 30 is received by the pin 37 of the piston rod 10. Thereby, the engaging portion 33 of the piston rod 10 and the engaging portion 34 of the clamp rod 30 are made to face each other with a predetermined interval L therebetween. [0027] The cylinder device shown in the first embodiment described above performs the following operations as shown in FIGS. 1 to 2B. "In the released state of FIG. 1, compressed air is discharged from the lock chamber 15 and compressed air is supplied to the release chamber 16." As a result, the compressed air in the release chamber 16 lowers the first piston 5 and the second piston 8 to the lower limit position. "In the above-mentioned released state, the workpiece W is carried in above the clamp bar 30, and the workpiece W is placed on the support pin 42 protruding upward from the table T. [0028] When the pressure cylinder device is locked and driven from the released state of FIG. 1 to the locked state of FIG. 2B, compressed air is discharged from the release chamber 16 and compressed air is supplied to the lock chamber 15. In this way, the compressed air in the lock chamber 15 moves the second piston 8 upward. In this state, the guide surface 11 of the piston rod 10 prevents the engagement ball 22 from moving inward in the radial direction, and the pressing portion 28 of the first piston 5 passes through the engagement ball 22 and is received by the support hole of the guide tube 3 The upper wall of 21 is received (that is, the first piston 5 is connected to the guide tube 3 through the engagement ball 22), so the ascent of the first piston 5 is prevented. And, as shown in FIG. 2A, the second piston 8 leaves the first piston 5 to raise a predetermined stroke with a low load. In this way, the second piston 8 lifts the clamp rod 30 through the compression spring 41. Thereby, the pressing portion 40 of the clamp rod 30 abuts against the lower surface of the workpiece W. As a result, although the clamp rod 30 is received by the workpiece W, the second piston 8 gradually rises against the urging force of the compression spring 41. [0029] Next, the second piston 8 moves upward so that the cam surface 24 of the second piston 8 rises to the height position of the engagement ball 22. In this way, the engagement ball 22 is allowed to move to the inside in the radial direction. Then, the combined force of the pressing force corresponding to the pressure of the compressed air in the lock chamber 15 and the elastic thrust of the fixed spring 19 will move the engagement ball 22 to the radially inner side through the pressing portion 28 of the first piston 5 The engagement ball 22 presses the cam surface 24. Thereby, the connection between the first piston 5 and the guide tube 3 (housing 1) is released, and the first piston 5 is connected to the second piston 8 through the engagement ball 22. Next, the first piston 5 moves the second piston 8 upward and downward against the elastic force of the compression spring 41 through the pressing surface 27, the engagement ball 22, and the cam surface 24. In this way, as shown in FIG. 2B, the engaging portion 33 of the piston rod 10 abuts against the engaging portion 34 of the clamp rod 30. Thereby, the second piston 8 presses and supports the workpiece W from below through the clamp rod 30. As a result, the cylinder device is switched from the released state to the locked state. [0030] In the above-mentioned locked state, even when the pressure of the locking chamber 15 is reduced or disappeared for some reason, the upward elastic thrust of the fixed spring 19 can be transmitted through the multiplying mechanism 20 (pressing surface 27, The latching action of the engagement ball 22 and the cam surface 24) mechanically maintain the locked state, so the locked state can be reliably maintained. [0031] When the above-mentioned cylinder device is switched from the locked state of FIG. 2B to the released state of FIG. 1, in the locked state of FIG. 2B, compressed air is discharged from the lock chamber 15 and supplied to the release chamber 16. The compressed air is compressed to release the compressed air in the chamber 16 to gradually lower the first piston 5. In this way, the movement of the engagement ball 22 to the outer side in the radial direction is allowed. Next, the second piston 8 is lowered by the compressed air in the release chamber 16, and the cam surface 24 of the second piston 8 pushes the engagement ball 22 outward in the radial direction. In this way, the first piston 5 is received from below by the lower end wall 1b, and almost at the same time, the guide surface 11 of the piston rod 10 prevents the engagement ball 22 from moving inward in the radial direction. Then, the connection state between the first piston 5 and the second piston 8 is released, and the first piston 5 is received by the peripheral wall of the support hole 21 of the guide tube 3 through the engagement ball 22, thereby preventing this The first piston 5 rises. After that, the second piston 8 is further lowered with respect to the first piston 5 whose movement in the vertical direction is prevented. In this way, the pin 37 of the piston rod 10 abuts against the lower end wall of the long hole 38 of the clamping rod 30, so that the second piston 8 moves the clamping rod 30 downward. Then, the lower end surface of the second piston 8 is received by the lower end wall 1b of the housing 1. Thereby, the press cylinder device is switched from the locked state to the released state. [0032] The first embodiment has the following advantages. "In the first embodiment described above, before the multiplying drive of the multiplying mechanism 20 starts, the second piston 8 abuts the work W through the compression spring 41 and the clamp rod 30. Therefore, compared with the aforementioned prior art, the clamping rod is brought into contact with the workpiece during the double-force driving stroke of the double-force mechanism. The press cylinder device of this embodiment can alleviate the effect of the clamping rod 30 on the workpiece W. Rush. [0033] FIGS. 3A and 3B or FIGS. 4A to 5B show the second embodiment or the third embodiment of the present invention. For the same components (or similar components) as the above-mentioned first embodiment, the principle is The same reference symbols are attached for explanation. An example is a link type clamping device to which the cylinder device with double force mechanism of the second embodiment is applied. [0034] The second embodiment shown in FIGS. 3A and 3B differs from the above-mentioned first embodiment in the following points. An insertion hole is formed in the horizontal direction at the upper end of the clip rod 30, and an insertion hole is formed in the horizontal direction at the left end of the clip arm 44. A connecting pin is inserted into the insertion hole of the clamp rod 30 and the insertion hole of the clamp arm 44. Thereby, the left end of the clamp arm 44 is connected to the upper end of the clamp rod 30 so as to be swingable in the vertical plane. In addition, on the upper end wall 1a of the housing 1 on the right side of the clamp lever 30, the pivot portion 45 is protruded upward. The lower end portion of the link member 46 is swingably connected to the pivot portion 45. The upper end portion of the link member 46 is swingably connected to the middle portion of the clamp arm 44 in the longitudinal direction. A pressing member 48 is attached to the right end of the clamp arm 44. A pressing portion 48a is formed at the lower end of the pressing member 48 so that the pressing portion 48a can abut against the work W. As shown in FIG. , in this embodiment, the output member 29 is constituted by the clamp rod 30 and the clamp arm 44. [0035] As shown in FIG. 3A, the second piston 8 is formed in a ring shape, and the clamp rod 30 is inserted into the cylindrical hole 51 of the second piston 8 in a sealed state so as to be movable in the vertical direction. The lower end surface of the clamping rod 30 can abut against the lower end wall 1 b of the housing 1. Thereby, in the released state, the compressed air in the release chamber 16 will pass through the second piston 8 to push the lower rod 53 of the clamp rod 30 to the lower limit position, so that the lower end surface of the lower rod 53 is covered by the lower end wall 1b of the housing 1 Give to undertake. As a result, in the released state, the vertical movement of the clamp lever 30 is prevented, and the released state is surely maintained. [0036] The second embodiment has the following advantages. "In the second embodiment described above, before the multiplying drive of the multiplying mechanism 20 starts, the second piston 8 abuts the workpiece W through the compression spring 41 and the output member 29 (the clamp rod 30 and the clamp arm 44). Therefore, compared with the aforementioned prior art, when the clamp rod is brought into contact with the workpiece during the double-force drive stroke of the double-force mechanism, the press cylinder device of this embodiment can alleviate the effect of the output member 29 on the workpiece W. Rush. [0037] FIGS. 4A to 5B show a third embodiment of the present invention. The third embodiment differs from the above-mentioned first and second embodiments in the following points. "In the cylinder device of this embodiment, as shown in FIG. 4A, the cylindrical second piston 8 is inserted into the cylindrical hole 6 of the first piston 5 in a sealed state so as to be movable in the vertical direction. A cylindrical hole 51 in the vertical direction penetrates through the second piston 8. The clamp rod 30 of the output member 29 is inserted into the cylindrical hole 51 in a sealed state so as to be movable in the vertical direction. The lower end surface of the second piston 8 can abut against the lower end wall 1b of the housing 1. In addition, a compression spring (elastic pushing means) 41 is attached to the attachment hole 10 a constituting a part of the aforementioned cylindrical hole 51. [0038] The clamp rod 30 is inserted into the tube hole 12 of the guide tube 3. In the recess formed in the inner peripheral wall of the cylindrical hole 12, the ball 54 is installed so as to protrude inward in the radial direction. The ball 54 is inserted into a guide groove 55 formed in the vertical direction on the outer peripheral wall of the piston rod 10. Thereby, the second piston 8 can be moved up and down with respect to the guide tube 3 of the housing 1 and rotation is prevented. [0039] The cylinder bore 2 is partitioned into two upper and lower chambers by the first piston 5 and the second piston 8 and the clamp rod 30 described above. A lock chamber 15 is formed on the lower side of the first piston 5 and the second piston 8 and the clamp rod 30, and a release chamber 16 is formed on the upper side of the first piston 5 and the second piston 8 and the clamp rod 30. [0040] The clamp rod 30 has a rod body 52 inserted into the tube hole 12 of the guide tube 3, and a lower rod 53 formed on the lower side of the rod body 52 with a longer diameter than the rod body 52. The pressure of the compressed air in the lock chamber 15 or the release chamber 16 is applied to the lower rod 53, and the pressure receiving area S1 of the pressure receiving part of the lower rod 53 is set to be larger than the annular pressure receiving part of the second piston 8. The compressive area S2 is even wider. Therefore, the pushing force for moving the clamp rod 30 upward with the compressed air of the locking chamber 15 is greater than the force for pressing the second piston 8 upward with the compressed air of the locking chamber 15. Therefore, the clamp rod 30 is pushed upward (downward) by the compressed air in the lock chamber 15 (or the release chamber 16) before the second piston 8. In this embodiment, the elastic pushing means 56 that moves the clamp rod 30 upward with respect to the second piston 8 is constituted by the lock chamber 15 and compressed air supplied to the lock chamber 15. Here, the elastic pushing means 56 may replace the one formed by the lock chamber 15 and the like, and adopt a compression spring installed between the lower end surface of the clamp rod 30 and the lower end wall 1b of the housing 1. [0041] In addition, in the cylinder device of the third embodiment described above, the compression spring 41 described above may be omitted. In this case, compressed air is supplied to the lock chamber 15 as the elastic pushing means 56 to apply a thrust corresponding to the pressure of the compressed air to the clamp rod 30, making the clamp rod 30 larger than the second piston 8. Move up first. [0042] The cylinder device shown in the third embodiment described above performs the following operations as shown in FIGS. 4A to 5B. "In the released state of FIG. 4A, compressed air is discharged from the lock chamber 15 and compressed air is supplied to the release chamber 16. Thereby, the compressed air in the release chamber 16 moves the first piston 5 and the second piston 8 and the clamp rod 30 to the lower limit position. In the above-mentioned released state, the workpiece W is carried in by a transport mechanism (not shown) from above the clamp bar 30, and the workpiece W is placed on the table T. [0043] When the cylinder device is locked and driven from the released state of FIG. 4A to the locked state of FIG. 5B, compressed air is discharged from the release chamber 16 and compressed air is supplied to the lock chamber 15. In this way, the compressed air in the locking chamber 15 will press the clamping rod 30 and the first piston 5 and the second piston 8 upward. In this state, the guide surface 11 of the piston rod 10 prevents the engagement ball 22 from moving inward in the radial direction, and the pressing portion 28 of the first piston 5 passes through the engagement ball 22 and is received by the support hole of the guide tube 3 The upper wall of 21 is received (that is, the first piston 5 is connected to the guide tube 3 through the engagement ball 22), so the ascent of the first piston 5 is prevented. In addition, the first piston 5 presses the guide surface 11 of the piston rod 10 through the engagement ball 22, so the second piston 8 gradually rises against the friction force generated between the engagement ball 22 and the guide surface 11. In this way, the clamping rod 30 is moved upward before the second piston 8 by the pressing force corresponding to the pressure of the compressed air in the lock chamber 15 and the elastic thrust of the compression spring 41. Next, as shown in FIG. 5A, if the upper surface 53a of the rod 53 under the clamp rod 30 abuts against the top wall 51a of the long-diameter hole of the cylindrical hole 51, the clamp rod 30 and the second piston 8 move upwards as one unit. . In this way, the pressing portion 44a of the clamp arm 44 abuts against the upper surface of the work W. Then, the second piston 8 gradually rises against the urging force of the compression spring 41. [0044] Next, when the cam surface 24 of the second piston 8 rises to the height position of the opposing engagement ball 22, the engagement ball 22 is allowed to move inward in the radial direction. Then, the combined force of the pressing force corresponding to the pressure of the compressed air in the lock chamber 15 and the elastic thrust of the fixed spring 19 will cause the first piston 5 to rise, and the first piston 5 will engage the ball through the pressing portion 28 22 moves to the inner side in the radial direction, and further presses the engagement ball 22 against the cam surface 24. Thereby, the state in which the first piston 5 is connected to the guide cylinder 3 (housing 1) through the engagement ball 22 is released, and the first piston 5 is connected to the second piston 8 through the engagement ball 22. Thereby, the first piston 5 moves the second piston 8 upward through the engagement ball 22. In this way, as shown in FIG. 5B, the engaging portion 33 of the piston rod 10 abuts against the engaging portion 34 of the clamp rod 30. Thereby, the second piston 8 presses the workpiece W from above through the double force mechanism 20, the clamp rod 30, and the clamp arm 44. As a result, the cylinder device is switched from the released state to the locked state. [0045] In the above-mentioned locked state, even when the pressure of the locking chamber 15 is reduced or disappeared for some reason, the upward elastic force of the fixed spring 19 can be transmitted through the multiplying force mechanism 20 (pressing surface 27, The latching action of the engagement ball 22 and the cam surface 24) mechanically maintain the locked state, so the locked state can be reliably maintained. [0046] When the pressure cylinder device is switched from the locked state of FIG. 5B to the released state of FIG. 4A, in the locked state of FIG. 5B, compressed air is discharged from the lock chamber 15 and supplied to the release chamber 16. By compressing the air, the compressed air in the release chamber 16 resists the upward elastic thrust of the fixed spring 19 to lower the first piston 5. In this way, the movement of the engagement ball 22 to the outer side in the radial direction is allowed. Next, the second piston 8 is lowered by the compressed air in the release chamber 16, and the cam surface 24 of the second piston 8 pushes the engagement ball 22 outward in the radial direction. At this time, the compression spring 41 urges the clamp rod 30 upward with respect to the second piston 8, so the clamp rod 30 remains at the upper limit position. Next, when the top wall 51a of the long diameter hole of the cylinder hole 51 is brought into contact with the upper surface 53a of the lower rod 53 of the clamp rod 30, the second piston 8 and the clamp rod 30 move downward as a whole. Next, the first piston 5 is received by the lower end wall 1b from below, and almost simultaneously, the guide surface 11 of the piston rod 10 pushes the engagement ball 22 outward in the radial direction. Then, the connection state between the first piston 5 and the second piston 8 is released, and the first piston 5 is received by the peripheral wall of the support hole 21 of the guide tube 3 through the engagement ball 22. Thereby, the ascent of the first piston 5 is prevented. After that, if the second piston 8 and the clamp rod 30 descend further, the lower end surface of the second piston 8 is received by the lower end wall 1b of the housing 1 from below. In addition, the clamp rod 30 presses the compression spring 41 to shorten the distance L, so that the engaging portion 33 of the clamp rod 30 is received by the engaging portion 34 of the piston rod 10 from below. Thereby, the press cylinder device is switched from the locked state to the released state. [0047] However, in the cylinder device of the first and second embodiments described above, in the released state after the clamp rod 30 is moved to the lower limit position, the second piston 8 and the clamp rod 30 are separated by the compression spring 41. Distance L. "In contrast, in the cylinder device of the third embodiment described above, in the released state, the clamp rod 30 presses and shortens the compression spring 41 by a distance L, and abuts against the second piston 8. Therefore, the height dimension of the pressure cylinder device in the released state can be reduced by at least the distance L compared with the height dimension of the pressure cylinder device of the first and second embodiments. [0048] The above embodiments can be modified as follows. The installation posture of the cylinder pressure device may be an upside-down posture from the illustrated posture, or it may be installed in a horizontal posture or an oblique posture. "The second piston 8 described above is not limited to being constituted by the piston body 9 and the piston rod 10, and the piston rod may be omitted. In this case, the cam groove 23 and the cam surface are formed on the outer peripheral surface of the piston body 9, and the mounting hole 10 a is formed on the upper end of the piston body 9. The number of the above-mentioned engagement balls 22 is preferably 3 or 4, but it is also acceptable
11:15 AM 2018/5/3
There are 2 or more. The support hole 21 into which the engagement ball 22 is inserted may be penetrated in the horizontal direction instead of the oblique direction in the tube wall 3a of the guide tube 3. "The above-mentioned engagement member is not limited to the exemplified engagement ball 22, for example, it may be a member of other shapes, such as a cylindrical roller." The pressure fluid used in the pressure cylinder device of the present invention can also be substituted for the example compressed air and can be changed to other liquids such as compressed gas or hydraulic oil. The above-mentioned elastic pushing means may be substituted for the example compression spring 41, and may be replaced by an elastic member such as rubber or resin, or a gas spring. Others, of course, various changes can be made within the scope of the industry's expectations.
1‧‧‧殼體
1‧‧‧Shell
1a‧‧‧上端壁(前端壁)
1a‧‧‧Upper end wall (front end wall)
1b‧‧‧下端壁(基端壁)
1b‧‧‧Lower end wall (base end wall)
1c‧‧‧胴部
1c‧‧‧Carcass
2‧‧‧缸體孔
2‧‧‧Cylinder Bore
3‧‧‧導引筒
3‧‧‧Guide tube
3a‧‧‧筒壁
3a‧‧‧Cylinder wall
5‧‧‧第1活塞
5‧‧‧1st Piston
6‧‧‧筒孔
6‧‧‧Cylinder hole
8‧‧‧第2活塞
8‧‧‧Second Piston
9‧‧‧活塞本體
9‧‧‧Piston body
10‧‧‧活塞桿
10‧‧‧Piston rod
10a‧‧‧安裝孔
10a‧‧‧Mounting hole
11‧‧‧導引面
11‧‧‧Guide surface
12‧‧‧筒孔
12‧‧‧Cylinder hole
13‧‧‧銷
13‧‧‧pin
14‧‧‧導引槽
14‧‧‧Guide Slot
15‧‧‧鎖固室
15‧‧‧Locking room
16‧‧‧釋放室
16‧‧‧Release Room
17‧‧‧供給排出路
17‧‧‧Supply and discharge path
18‧‧‧供給排出路
18‧‧‧Supply and discharge path
19‧‧‧固定彈簧
19‧‧‧Fixed spring
20‧‧‧倍力機構
20‧‧‧Bei Li mechanism
21‧‧‧支撐孔
21‧‧‧Support hole
22‧‧‧卡合球(卡合構件)
22‧‧‧Clamping ball (Clamping member)
23‧‧‧凸輪槽
23‧‧‧Cam groove
24‧‧‧凸輪面
24‧‧‧Cam surface
27‧‧‧按壓面
27‧‧‧Pressing surface
28‧‧‧按壓部
28‧‧‧Pressing part
30(29)‧‧‧夾桿(輸出構件)
30(29)‧‧‧Clamp lever (output member)
30a‧‧‧短徑部
30a‧‧‧Short diameter part
30b‧‧‧長徑部
30b‧‧‧Long Diameter
33‧‧‧卡合部
33‧‧‧Clamping part
34‧‧‧卡止部
34‧‧‧Locking part
37‧‧‧銷
37‧‧‧pin
38‧‧‧長孔
38‧‧‧Long hole
40‧‧‧按壓部(輸出部)
40‧‧‧Pressing part (output part)
41‧‧‧壓縮彈簧(彈推手段)
41‧‧‧Compression spring (bouncing means)
42‧‧‧支撐銷
42‧‧‧Support pin
W‧‧‧工件(按壓對象物)
W‧‧‧Workpiece (pressing object)
T‧‧‧桌台
T‧‧‧table
