A transport disc for an opening device of a printed sheet feeder is arranged on a first opening drum of the opening device and has at least one outer elastic support. A bolt attachment is attached to the outer surface of the fan case and has an internal composite boss with at least one threaded metallic insert. The external load electric power is adjusted during the stop to reduce the total electric power load to be equal to or less than the constant electric power, and the electric power supply is resumed after the predetermined period of time has elapsed.