Device for transmitting optical signals between a first structural unit and a second structural unit which is arranged so as to be rotatable about an axis relative to the first structural unit, wherein the first structural unit has a first optical fibre (1.1) and the second structural unit has a second optical fibre (2.1), wherein the second structural unit comprises a second connector housing (2.5) which encloses the second optical fibre (2.1), and the device also comprises a first sleeve (1.2), a first bushing (1.3) and a housing (1.4), wherein the first sleeve (1.2) encloses the first optical fibre (1.1) and the first bushing (1.3) encloses the first sleeve (1.2), comprises a second sleeve (2.2) and a second bushing (2.3), wherein the second sleeve (2.2) encloses the second optical fibre (2.1) and the second bushing (2.3) encloses the second sleeve (2.2), and additionally comprises a bearing arrangement which has at least a first ring (3.1) and rolling bodies (3.3) that are supported so as to be able to roll on a conical surface (3.11) of the first ring (3.1), wherein the device is additionally configured such that the housing (1.4) at least partially encloses the first bushing (1.3) and at least partially encloses the second bushing (2.3) and also at least partially encloses the bearing arrangement, wherein the bearing arrangement is arranged so as to be axially displaceable both relative to the housing (1.4) and relative to the second connector housing (2.5), and the second bushing (2.3) is preloaded axially, by a second spring element, against the first bushing (1.3) via the bearing arrangement, such that the force introduced by the second spring element is introduced into the first bushing (1.3) by way of the bearing arrangement and the flow of force from the second spring element to the first bushing (1.3) takes place via the bearing arrangement, wherein the rolling bodies (3.3) are preloaded radially against the housing (1.4) by being supported on the conical surface (3.11). comprises a first sleeve (1.2), a first bushing (1.3) and a housing (1.4), wherein the first sleeve (1.2) encloses the first optical fibre (1.1) and the first bushing (1.3) encloses the first sleeve (1.2), comprises a second sleeve (2.2) and a second bushing (2.3), wherein the second sleeve (2.2) encloses the second optical fibre (2.1) and the second bushing (2.3) encloses the second sleeve (2.2), and additionally comprises a bearing arrangement which has at least a first ring (3.1) and rolling bodies (3.3) that are supported so as to be able to roll on a conical surface (3.11) of the first ring (3.1), wherein the device is additionally configured such that the housing (1.4) at least partially encloses the first bushing (1.3) and at least partially encloses the second bushing (2.3) and also at least partially encloses the bearing arrangement, wherein the bearing arrangement is arranged so as to be axially displaceable both relative to the housing (1.4) and relative to the second connector housing (2.5), and the second bushing (2.3) is preloaded axially, by a second spring element, against the first bushing (1.3) via the bearing arrangement, such that the force introduced by the second spring element is introduced into the first bushing (1.3) by way of the bearing arrangement and the flow of force from the second spring element to the first bushing (1.3) takes place via the bearing arrangement, wherein the rolling bodies (3.3) are preloaded radially against the housing (1.4) by being supported on the conical surface (3.11).