Abstract: A planetary gear train for a wind power station having at least one rotatable blade, including a frame, a driven shaft coupled to the frame and rotated by the at least one blade, a planet carrier coupled to the frame and the driven shaft, the planet carrier being structured and arranged to rotate with the driven shaft, at least one planet gear rotatably coupled to the planet carrier, each of the at least one planet gear having helical toothings, a ring gear coupled to the frame and having helical toothings engaging with the toothings of each of the at least one planet gear such that the ring gear is rotatably operative with each of the at least one planet gear, and a sun gear coupled to the frame and having helical toothings engaging with the toothings of each of the at least one planet gear such that the sun gear is rotatably operative with each of the at least one planet gear.

Abstract: The invention concerns a drive unit (10) for the center-wind reel-up of a paper machine or paper finishing machine, comprising means by which the rotation drive of the motor (11) is transferred to the shaft (19). In its interior, the shaft (19) comprises a transfer shaft (21) rotatable along with the shaft (19), said transfer shaft (21) being fitted to be displaceable on a coupling and uncoupling process in the direction of the longitudinal axis (X.sub.1) of the shaft (19) by means of a cylinder device (22). When the transfer shaft (21) is displaced (arrow L.sub.1) towards the coupling half (23b) of the central drum of the paper web roll (P), the coupling half (23a) of the drive unit attached to the end of the transfer shaft (21) is displaced into engagement with the web roll coupling half (23b). The invention further concerns a hydraulic operating system for the reel-up.