Rotation joint

A rotation joint with weight compensation comprising first and second joint elements (4, 9) arranged for rotation with respect to each other about an axle (2), a cam ring (5) arranged in a housing coaxial to the axle, the cam ring having a curved track with a spatial curvature, a spring guide element arranged coaxial to the axle, a spring (3) mounted coaxial to the axle along the spring guide element, and bolts (7) arranged radial to the axle and having bearings (8) whose outer circumference lies in force-transmitting relation on the curved track, wherein the housing is essentially formed by the first and second joint elements (4, 9), the axle (2) is rigidly connected with the first joint element (4), the cam ring (5) is axially movable but fixed against rotation, the second joint element (9) is locked against movement in a direction of the axle, and the bolts (7) are fixed in the second joint element (9), such that the first joint element is maintained in any desired rotational position relative to the second joint element by the bearings (8) acting on the curved track to strain or relieve the spring to provide weight compensation depending on a direction of rotation.