Abstract: An electrically operated actuator includes a box-shaped body to which an angularly movable rocking arm is pivotally connected; the actuator also includes control elements operatively connected to the rocking arm by a toggle-lever mechanism, the control elements in turn having at least one electric motor, and a connecting screw-nut mechanism. The actuator further includes a position transducer device of rotary and absolute type, providing reference signals univocally related to the angular positions of the rocking arm, and a programmable electronic control unit and self-braking elements for the electric motor, the control unit being programmed to control the angular rotation of the rocking arm and to actuate the self-braking elements for the electric motor, in relation to the control signals provided by the absolute transducer device.

Abstract: An electrically actuated linear actuator capable of simulating the performances of a pneumatic cylinder; the actuator includes a gear reduction unit connected to a slidable rod via a drive device including a screw-nut assembly. The gear reduction unit is slidably supported and, at the end of the working stroke of the actuator, is moved backwards by the rotation of the screw of the drive device, against biasing springs which provide a forward thrust on the rod. An electronic control unit selectively controls the power supply to the electric motor and to a locking brake, in relation to control signals emitted by a rotary signal generator.

Abstract: A toggle-lever clamping device for clamping work pieces includes a box-shaped body which supports a clamping member movable between a forward disengaging position and a backward position for clamping the work piece. The device also includes control elements operatively connected to the clamping member by elements of an intermediate toggle-lever connecting link, and an articulated quadrilateral system; the intermediate connecting link is in the form of an axially yieldable flat spring having a plurality of side by side arranged elastically yieldable spring sections, aligned according to its longitudinal axis. The articulated quadrilateral system and the intermediate connecting link are constructed and disposed in such a way as to maintain an irreversible locking condition of the clamping member to clamp work pieces, compensating differences in thickness of the work pieces.

Abstract: The toggle-lever clamping device comprises a box-shaped body provided with a clamping member movable between an advanced and a retracted position in which it disengages and respectively locks a work piece. The clamping member is arranged on a side of the box-shaped body and is operatively connected to a linear actuator by an articulated quadrilateral system and an intermediate toggle-lever connecting link. The clamping member extends from the box-shaped body in a substantially orthogonal direction to the linear actuator, and the articulated quadrilateral system and the intermediate toggle-lever link are constructed and arranged to transform a linear movement of the actuator into a composite racking and linear movement of the clamping member to retain and disengage a work piece.

Abstract: A clamping device for clamping work pieces; the clamping device comprises a box-shaped body, a clamping member, and a manually operable control lever; first and second toggle-lever system and an intermediate guide member are provided to connect the control lever to the clamping member of the device. The first and the second toggle-lever systems are constructed and arranged to act in correlation, in such a way that in the clamping condition of the device, the pivotal axes and the intermediate hinge axis of the second toggle-lever system, in the advanced condition of the clamping member are arranged on reference lines forming a small angle against a stop.

Abstract: A device for clamping overlapped edges of metal sheets to be joined by laser welding; the clamping device comprises a box-shaped head, a clamping arm pivotally connected to one end of the head, in order to rotate between an open condition, a closed condition in which the overlapped edges of the metal sheets are pressed against each other, and an intermediate condition in which the overlapped edges of the metal sheets are made to be slightly spaced apart for laser welding; the clamping arm is operatively connected to an electric control actuator by a toggle mechanism and intermediate transmission members; the clamping device also comprises counteracting biasing means to rearwardly urging the clamping arm for compensation of clearances existing in the operative connection between the clamping arm and the electric control actuator.

Abstract: The apparatus comprises a clamping device having a box-shaped casing and a clamping member for clamping work pieces, operatively connected to an electric actuator to move the clamping member between a first and a second operative position. The clamping apparatus is also provided with electric switching means which can be manually operated by a control member to reverse the polarities of the power voltage supply to the electric actuator, to selectively control the movement of the clamping member in respect to both operative positions; the control member may be in the form of a manually operable lever or control buttons.

Abstract: The apparatus comprises a box shaped body and a clamping member, movably supported between first and second operative positions to lock and respectively release a work piece. A linear detecting device generates a set of control signals for a control unit, during the movement between the operative positions of the clamping arm. The detecting device comprises a first and a second sensor and indexing means in the form of a comb-shaped member having spaced apart teeth to sequentially activate the sensors and provide the set of control signals during the movement of the clamping member.

Abstract: The clamping device for clamping work pieces comprises a box-shaped body, and an angularly movable clamping arm, operatively connected to an electric control actuator by a toggle-lever mechanism and an axially extensible thrust member. The toggle-lever mechanism comprises a connecting link having first and second link sections hinged on opposite sides of a crank member of the clamping arm, and to a screw and nut mechanism of the thrust member. The screw slides in an axial through bore which extends along the thrust member and through a hole in a hinge pin which connects the thrust member to the sections of the connecting link.

Abstract: The clamping device for clamping work pieces comprises a box-shaped casing and a pivotally supported clamping arm operatively connected to a control actuator. The clamping device comprises at least a first and a second sensor for detecting and monitoring operative positions of the clamping arm; the sensors are adjustably fastened to a base plate comprising a plurality of anchoring bushes for the sensors spaced apart and aligned in a longitudinal direction of a base plate. Each sensor is removably secured to the base plate by fasteners, which engage with respective anchoring bushes.

Abstract: A centering device provided with cleaning means for cleaning a movable centering rod, and for preventing infiltration of dirt. The cleaning means comprise at least one annularly-shaped scraping member provided with angularly spaced apart cross-cuts, which divide the scraping member into circular sections having inner scraping edges. The scraping member is locked against a conical shoulder in such a way as to be elastically yieldable, making the inner scraping edges of the sections adhere to the centering rod.

Abstract: The clamping device comprises a box-shaped body provided with a clamping member movable between a forward position and a backward position. Control means are provided for controlling the movement of the clamping member; the control means comprise a thrust member operatively connected to the clamping member by an articulated quadrilateral system, and a toggle-link, in which the hinge point of the link, in the backward position of the clamping member are disposed on opposite sides of the thrust member. The device also comprises scraping means for cleaning the clamping member and to prevent the infiltration of dirt.

Abstract: A toggle lever clamping device for clamping a workpiece to a support frame includes a box-shaped head to which a clamping arm is pivoted to rotate between an open and a closed condition to release respectively to lock the workpiece; the clamping arm is operatively connected to an actuator by a toggle lever mechanism having a dead center condition beyond which the clamping arm is tightened against the workpiece. The toggle mechanism includes an elastically yieldable connection link which, upon reaching the dead center of the toggle lever mechanism is sequentially allowed to axially yield for a some degree and to deflect in a controlled mode by a confronting stop provided on the same clamping arm.

Abstract: An electrically-operated clamping device includes a clamping member pivotally supported by a housing, to rotate between an open and a closed position; the clamping member is connected to electric motor element by a toggle joint mechanism and an axially extendable thrust member. The thrust member comprises a nut screw mechanism, connected to the electric motor element of a geared mechanism having a gear reduction unit and a torque adapter. The electric motor element in turn includes a first and a second electric motor disposed parallel to each other on opposite sides of the thrust member.

Abstract: A clamping device for clamping work pieces; the clamping device comprises a box-shaped body, a clamping member, and a manually operable control lever; first and second toggle-lever system and an intermediate guide member are provided to connect the control lever to the clamping member of the device. The first and the second toggle-lever systems are constructed and arranged to act in correlation, in such a way that in the clamping condition of the device, the pivotal axes and the intermediate hinge axis of the second toggle-lever system, in the advanced condition of the clamping member are arranged on reference lines forming a small angle against a stop.

Abstract: A clamping device for work pieces; the device comprises a box-shaped body, at least one clamping member protruding from the front end of the box-shaped body, and sealing means to prevent dirt from entering through the front end of the box-shaped body and a tiltable closing member, having a scraping head which extends between the rear longitudinal edge of the clamping member, and a cross edge of an aperture for protrusion of the clamping member. A spring urge the clamping member to maintain the scraping head constantly in contact with the rear edge of the clamping member during the movement.

Abstract: A clamping device for work pieces; the device comprises a box-shaped body having un longitudinal axis, at least one movable gripping member, and control means for moving the gripping member between an advanced and a retracted position. The gripping member is operatively connected to the control means by an articulated system having an L-shaped lever, and a toggle lever device; an arm of the L-shaped lever defines a first connecting rod pivotally supported by a first pivotal axis and connected to the clamping member by a first articulation axis. A second connecting rod is pivotally supported by the box-shaped body to rotate according to a second pivotal axis, and in turn is connected to the clamping member by a second articulation axis. The two connecting rods are of different lengths, and the pivotal axes or articulation axes, lie in a plane passing through a reference line which forms an angle with respect to the longitudinal axis of the box-shaped body.

Abstract: A device for clamping overlapped edges of metal sheets to be joined by laser welding; the clamping device comprises a box-shaped head, a clamping arm pivotally connected to one end of the head, in order to rotate between an open condition, a closed condition in which the overlapped edges of the metal sheets are pressed against each other, and an intermediate condition in which the overlapped edges of the metal sheets are made to be slightly spaced apart for laser welding; the clamping arm is operatively connected to an electric control actuator by a toggle mechanism and intermediate transmission members; the clamping device also comprises counteracting biasing means to rearwardly urging the clamping arm for compensation of clearances existing in the operative connection between the clamping arm and the electric control actuator.

Abstract: An electrically-operated clamping device. The clamping device comprising a clamping member pivotally supported by a housing, to rotate between an open and a closed position; the clamping member is connected to electric motor means by a toggle joint mechanism and an axially extendable thrust member. The thrust member comprises a nut screw mechanism, connected to the electric motor means by means of a geared mechanism comprising a gear reduction unit and a torque adapter. The electric motor means in turn comprises a first and a second electric motor disposed parallel to each other on opposite sides of the thrust member.

Abstract: The clamping apparatus for clamping work-pieces, is provided with optical detectors for sensing and/or controlling a movable member at the ends of a stroke. The working positions of the movable member are sensed by optical detectors removably supported and positionably housed in a front open casing fitted in the body of the apparatus. In the event the clamping apparatus being operated by a rotary actuator, use is made of an optical detector of rotary type to provide a set of control signals.