Patent ID: 7668418

Claim:
A machine, comprising: a first machine part; a second rotating machine part, which rotates relative to the first machine part around an axis of rotation; a plurality of light sources provided on the second rotating machine part for outputting light signals for a data transfer; light receivers for receiving the light signals located on the first machine part, the light source and the light receiver being arranged such that the light signals are transmitted in a radial direction to the axis of rotation, a branching optical waveguide structure, wherein the plurality of light sources couple light into the branching optical waveguide structure, individual optical waveguide branches ending at the edge of the second rotating machine part, ends of the optical waveguide branches and their angular spacing being selected suitable for the number and angular spacing of the receivers so that for each angular position light from at least one optical waveguide branch end reaches a receiver, wherein the plurality of light sources are activated by a control unit which only causes some of the light sources to output light simultaneously, and wherein the control unit selects the part of the light sources caused to output light simultaneously as a function of an angular position of the second rotating machine part such that only those light sources of which the light reaches a receiver at the angular position are made to output light.