Abstract: The invention relates to a frictional planetary gear with variator action. A first set of planet wheels roll along the internal rolling surface of a driving ring. A second set of planet wheels roll along a fixed rotation roller path. The planet wheels have pins thereof supported on planet flanges. The planet wheels of the second set are supported by means of a resilient central element for radial displacement. The fixed rotation roller path has a diameter which is adjustable, enabling an easy and expedient regulation of the transmission ratio even at high transmission ratios.

Abstract: The invention concerns a planetary gear with friction planet wheels, especially for high rotational speeds. One of the gear shafts is connected to a flange further connected to the friction planet wheels transmitting the power. The planet wheels form the sole bearing for the gear casing and both gear shafts.

Abstract: A method for providing a running web with a perforation pattern fitting into printed image units successively printed on the web. The method includes the steps of performing a longitudinal perforation in a separate longitudinal perforator and performing a transverse perforation in a transverse perforator, wherein the perforation is divided to be carried out by a plurality of separate units. The pitch of the transverse perforation rows in the longitudinal direction of the web is controlled by changing the relative position of the transverse perforation units with respect to each other in accordance with the desired perforation pattern. The transverse perforator can be formed by a plurality of transverse perforation units each having a die roll in cooperation with two needle rolls placed diametrically at opposite sides of the die roll.