Gripper device for mounting rubber elastic rings and finger for a gripper device of this type

A gripper device for mounting rubber elastic rings on at least one of an inner wall of a work piece opening and on an exterior of a work piece with a basic housing and with forming jaws and bearing jaws, whereby the forming jaws and the bearing jaws are displaced in relation to the basic housing wherein the individual forming jaws and the individual bearing jaws are respectively coupled to one another in such a way that the forming jaws are displaced independently of the bearing jaws and the bearing jaws are displaced independently of the forming jaws in a radial direction in at least one of toward and away from one another, the gripper device further comprising an axially displaceable plate element on which jaw guides are positioned for at least one of the forming jaws and the bearing jaws to guide said jaws in the radial direction in at least one of toward and away from one another, wherein to displace the plate element together with the jaws that are located on said element in an axial direction, the element is provided with a piston which engages in a piston cylinder in the basic housing, wherein the jaws that are located on the plate element are mechanically coupled by means of a common actuator to displace the jaws in the jaw guides in the radial direction, wherein said actuator is driven by an actuator piston that is located in the piston.