Motorized manipulator of the cable transmission type having an increased field of action

A motorized manipulator, wherein it comprises a body, a shaft (2) which rotates about its longitudinal axis (3) with respect to said body, an upper arm (4) articulated to the end of the shaft about a shoulder axis (5) orthogonal to the longitudinal axis of the shaft and to the longitudinal axis of the arm, an intermediate arm (6) directly articulated to the end of the upper arm about an elbow axis (7) parallel to the shoulder axis, a forearm (9) articulated to the end of the intermediate arm about another axis (8) parallel to the elbow axis, said forearm being able to rotate about its longitudinal axis, a tool (12) having a longitudinal axis (13) mounted in pivotal manner at the end of said forearm about an axis (11) perpendicular to the plane defined by the longitudinal axes of the forearm and tool, the tool being able to rotate about its longitudinal axis, a plurality of motors (22, 22', 23) fixed within the body and transmission means by cables and pulleys for transmitting the control movements of the motors to the corresponding moving members of the manipulator, at least the rotation movement of the forearm about its longitudinal axis and the movements of the tool with respect to the forearm being in each case controlled by at least one cable or line strand passing over first pulleys of the same diameter mounted respectively on the shoulder axis, the elbow axis and the another axis, at least one opposing cable or line strand passing over second pulleys of the same diameter as the first pulleys, mounted respectively on the shoulder axis, the elbow axis and the another axis, said at least one opposing cable or line strand being mounted in an opposing path with respect to said at least one cable or line strand, to balance tension of the latter and maintain the angle between the longitudinal axis of the forearm and the longitudinal axis of the shaft to a given value.