<p>The device has guide vanes (10) pivotable about respective vane shank (12). Adjusting levers (13) transmit a torque from an adjusting ring (30) to the vane shank. The vane shank and the adjusting lever of the respective guide vanes are of one-piece design. The adjusting levers include a cylindrical pin guided to rotate about an axis of the pin, and displaceable along the axis in a hole of a cylindrical transmission element. The element is guided to rotate about an axis of the element and displaceable along the axis of the element in a hole of the ring.</p>
