Abstract: An operation member (51) is fixedly secured to a right portion of a relief member (29) inserted into a housing (20). An annular transmission member (52) externally fitted to the operation member (51) is supported by a guide groove (62) so as to be vertically movable and is urged downward by a spring (74). When the relief member (29) doesn't perform the relief operation, a detected portion (65) of the transmission member (52) is made to access a detecting portion (68) of a proximity switch (14) by the operation member (51). At the time of the relief operation, the relief member (29) and the operation member (51) are rapidly moved rightward, so that the detected portion (65) is spaced apart from the detecting portion (68) by the spring (74).

Abstract: A first threaded member (11) is supported by a housing (3) so as to be rotatable about its axis and to be unable to axially advance and retreat. While a second threaded member (22) is threadably engaged with the first threaded member (11) so as to be able to axially advance and retreat, the second threaded member (22) is supported by the housing (3) under the condition that its rotation about its axis is preventable. Under a clamping condition, the second threaded member (22) is strongly tightened by the first threaded member (11) which has been rotated by an impact wrench (16). Thereby, a metal mold (6) is fixedly pressed by a clamping member (5). When changing over from the clamping condition to an unclamping condition, large counterclockwise impacts are intermittently imposed to the first threaded member (11) by the wrench (16). Thereupon, the first threaded member (11) is rotated counterclockwise little by little by those impacts.

Abstract: A supply-discharge valve member (30) inserted into a valve casing (29) can be pushed downward by pressure fluid of an actuation chamber (35). A restriction passage (G) is constituted by a fitting clearance between a valve bore (61) and an opening-closing valve member (62) provided in the valve casing (29). The pressure fluid supplied to the chamber (35) is quickly discharged to an atmosphere side through the restriction passage (G) when an amount of the supplied fluid is extremely a little. When the supplied amount increases, since a flowing resistance of the restriction passage (G) increases and the pressure within the chamber (35) is increased, a closing valve surface (69) of the opening-closing valve member (62) is brought into contact with a valve seat (70) for closing by that pressure to prevent the pressure fluid from being discharged.

Abstract: A fulcrum portion (5a) provided in a midway portion of a clamp arm (5) in the left and right direction is supported vertically pivotably by a housing (3) through a pin (13). A first shaft (21) of a transmission member (18) is fitted into a driven portion (5b) provided in the right portion of the arm (5). A second shaft (22) of the transmission member (18) is so supported by support grooves (25) of the housing (3) through rollers (24) as to be movable in the front and rear direction. The first shaft (21) and a piston rod (50) of a pneumatic cylinder (6) are connected to each other by a lever (19). At the time of clamping, the first shaft (21) is eccentrically rotated clockwise about an axis (A) of the second shaft (22).

Abstract: A clamp rod (20) is inserted into a through hole (2) of a base (1). The rod (20) is provided with a first external thread (21) adapted to engage with a clamping internal thread (11a) of a metal mold (11) and a second external thread (22) adapted to engage with a raising and lowering internal thread (12a). When the metal mold (11) is fixedly secured to the base (1), the rod (20) is rotated by an impact wrench (28). Thereupon, the rod (20) is screwed downward along the raising and lowering internal thread (12a) and then along the clamping internal thread (11a). Thereby, the base (1) is pressed downward by a pressing portion (23) of the rod (20).

Abstract: A cylindrical case (8) is inserted hermetically into a first housing (1) of a socket (A), and the cylindrical case (8) is urged rightward by an advancing spring (9). A sliding cylinder (20) is inserted hermetically into the cylindrical case (8), and the sliding cylinder (20) is urged rightward by another advancing spring (28). As the socket (A) and a plug (B) are connected toward each other, a pushing member (65) arranged at the leading end portion of a second housing (2) of the plug (B) makes the sliding cylinder (20) retreat to an opening position on the left side as well as a first closing member (26) inserted into the sliding cylinder (20) pushes a second closing member (62) inserted into the second housing (2) to , an opening position on the right side.

Abstract: In a movable plate (1) of an injection moulding machine, there are arranged a threaded hole (29) and a supporting hole (28) in series in the substantially horizontal direction. A supporting portion (22) of a support cylinder (12) is fitted into the supporting hole (28), and a roller member (14) is externally rotatably fitted to a bearing portion (23) of the support cylinder (12). An annular flange portion (25) is provided between the supporting portion (22) and the bearing portion (23). An outer diameter (D) of the flange portion (25) is so set as to be larger than an inner diameter (A) of the supporting hole (28) and to be smaller than an outer diameter (B) of the roller member (14). The bolt (16) is screwed into the threaded hole (29) so as to press the flange portion (25) onto the movable wall (1) through the support cylinder (12).

Abstract: A stopping device (37) is provided in a metal mould depository stand (6) and a stop cancelling device (39) is provided in a metal mould replacing carriage (3). When a metal mould (13) supported by the stand (6) is transferred onto the carriage (3), firstly the carriage (3) is moved to a location of the stand (6) a stopped condition of which is going to be cancelled, so as to make an output portion (53) of the cancelling device (39) face an actuating member (44) of the stopping device (37). Then, the output portion (53) is made to advance from a return position (G) to an advanced position (H). Thereupon, the actuating member (44) is changed over to a retracting actuation position (D), so that the actuating member (44) changes over a stopper member (42) to a retracted posture (B).

Abstract: An annular block (3) and an annular housing (23) are arranged in a lower portion of a head unit (1). A plurality of cylinder bores (27) are arranged within the housing (23) in along its outer periphery. The cylinder bores (27) are opened inwardly and acclivously in an inner peripheral surface (26) of the housing (23). At the time of clamping actuation, pistons (28) inserted into the respective cylinder bores (27) are adapted to be advanced inwardly and acclivously. Thereupon, a flange (15) provided in the upper portion of a die (5) is pressed to a bottom surface of a receiving hole (14) provided in the block (3) by clamping members (42) of the pistons (28).

Abstract: A rear portion of a chain transmission member (21) is connected to a push/pull drive device (19) disposed in the rear portion of the metal mould replacing stand (3) while a front portion of the transmission member (21) is connected to the advancing/retreating member (22). A guide rail (23) for accommodating the transmission member (21) and the advancing/retreating member (22) is placed in the upper portion of the replacing stand (3) so as to extend in the fore and rear direction. A front portion of a hook (28) is supported vertically swingably by a front portion of the advancing/retreating member (22) through a pin (29) and a concave engaging portion (30) is formed in the rear swingable portion of the hook (28) so as to face upward. An engaged portion (34) is formed in the rear portion of the metal mould (7) so as to project downward and the engaging portion (30) is adapted to be engaged with the engaged portion (34) by means of a spring (36) from below.

Abstract: In a lower portion of a movable plate (1) of an injection moulding machine, there are provided a plurality of conveying rollers (10) arranged with a predetermined interval in the horizontal direction. The roller (10) comprises a support block (11) facing the movable plate (1), a support cylinder (12) fitted into an upper portion of the block (11), a roller member (14) externally mounted to the support cylinder (12), a bolt (16) inserted into a bore (15) of the support cylinder (12) through an annular clearance (17) and a positioning pin (18) fitted into a lower portion of the block (11) and the movable plate (1). The bolt (16) is screwed into the threaded hole (29) of the movable plate (1), so that the bolt (16) presses the support cylinder (12) onto the movable plate (1).

Abstract: A first cylinder bore (7) for accommodating a first piston (8), a plunger bore (20) for accommodating a plunger (21), and a second cylinder bore (57) for accommodating a second piston (58) are provided in this order from above. The plunger (21) is fixed to the first piston (8). A cushion chamber (61), provided below the second piston (58), and an outlet (25b) of a second check valve (25) for gas discharge are connected to each other via a communicating passage (62). The second piston (58) is prevented from moving upward in excess of a set extent by a stopper (64) provided in the peripheral wall of the second cylinder bore (57).

Abstract: An operated member (17) fixed to a mold plate (14) is adapted to be pushed and pulled in the left and right direction by way of a push/pull hook (31) of a mold replacing carriage (3). When a mold (13) on the carriage (3) is moved onto a mold placing stand (6), the mold plate (14) is brought out to a predetermined position on the stand (6) by way of the hook (31) and after that the leftward and rightward movements of the operated member (17) is prevented by way of the left and right stoppers (41) (42). The first stopper (41) on the left side is retracted below a mold supporting surface (S) at the time of passing of the mold (13). The second stopper (42) on the right side is disposed at such a position as allowing the mold (13) and the mold plate (14) to pass thereby.

Abstract: A wedge type locking member (27) is brought into contact with a first piston (12) for clamping by means of a pushing spring (28). Thereby, the first piston (12) is prevented from returning from the clamping position (X) to the unclamping position (Y). The locking member (27) is provided with two pressure receiving surfaces (F)(S) having substantially equal areas. A fluid pressure within a first actuation chamber (13) for clamping acts upon these pressure receiving surfaces (F)(S). The locking condition of the locking member (27) is cancelled by means of a second piston (39).

Abstract: A clamping device including a clamp housing a generally horizontally extending cylinder bore that opens into an upwardly and rearwardly sloping guide bore formed in a front portion of the clamp housing is disclosed. A clamping member is shiftably mounted within the guide bore and a piston is shiftably mounted within the cylinder bore. The clamping member is formed with a groove into which a projection, carried by the piston, is fitted. By this arrangement, movement of the piston forces the clamping member to shift in an inclined direction between clamping and unclamping positions.

Abstract: A clamping first piston (11) is inserted into a locking second piston (17) inserted into a cylinder bore (9) of a housing (4). A clamping member (7) is fixedly secured to the left portion of the first piston (11). A clamping first actuation chamber (21) is formed on the right side of both those pistons (11)(17), and an enclamping second actuation chamber (25) is formed on the left siede of the second piston (17). A wedgy space (30) is formed between the outer circumferential surface of the first piston (11) and the cylinder bore (9). A locking wedge (31) is inserted into the wedgy space (30) from right side and an unlocking engaging portion (34) is opposed to an unlocking engaged portion (33) of the first piston (11) from left side, so that these wedge (31) and the engaging portion (34) are fixedly secured to the second piston (17).

Abstract: A first piston (11) is inserted into a second piston (12) within a housing (4). An acting point portion (A), a fulcrum portion (C) and a wedge type pressure receiving surface (B) are provided in the first piston (11) in order from front side. A first swing gap (37) and a second swing gap (38) are provided in a space below the front portion of the first piston (11) and in a space above the rear portion thereof respectively. The second piston (12) is provided with a pushing surface (F) facing the pressure receiving surface (B) from below. At the time of clamping, by a fluid pressure within a first actuation chamber (21) both the pistons (11) (12) are advanced and after that the second piston (12) is advanced relative to the first piston (11). Thereupon, the acting point portion (A) is swung downwardly about the fulcrum portion (C).

Abstract: A pillar (3) is projected upwardly from a central portion (2) of a base plate (1), and at least two work receiving portions (4) (4) are disposed in the opposite sides of the peripheral portion of the base plate (1). A plurality of pressing arms (5) (5) are projected radially from the pillar (3) toward the work receiving portions (4) (4), and these pressing arms (5) (5) are supported horizontally pivotally by the pillar (3). A pressing hydraulic cylinder (6) is disposed in the projecting portion of the pressing arm (5) so as to face downwardly.

Abstract: A clamping-member (7) is adapted to be straightly actuated from slantly above relative to a clamped surface (2a) of a clamped object (2) placed in front of a housing (4) and is provided with a clamping end surface (22) formed substantially in parallel to the clamped surface (2a). A shuttle member (21) for sliding is interposed between the clamped surface (2a) and the clamping end surface (22) and supported by the clamping end surface (22) so as to be slidingly movable within a certain extent in front and rear directions.

Abstract: A check valve (14) with a valve opening actuator function and a bypass opening/closing valve (17) are disposed in parallel in a pressure oil supply/discharge passage (3) connected in communication with a hydraulic actuation chamber (2). The opening/closing valve (17) is adapted to be held at a valve opened position (Y) against a residual pressure holding spring (19) when the pressure on the check valve inlet (14a) side is normal and to be changed over to a valve closed condition (X) by means of the spring (19) when the pressure has lowered to a predetermined value. The pressure oil supply/discharge passage (3) and a pressure discharge passage (7) are connected in communication with each other through a pressure compensation valve (12). The opening/closing valve (17) is composed of a piston valve member (38) resiliently biased against a bypass valve seat (40) by means of the spring (19).