Patent ID: 7000540

Claim:
A method of operating a machine processing printing material sheets, which comprises: providing a sheet transport drum of the printing machine with drum circumferential shells; operating the sheet transport drum in various operating modes; in a first of the operating modes, fixing the drum circumferential shells in an outer position on the sheet transport drum at a distance from an axis of rotation of the drum; in a second of the operating modes, fixing the drum circumferential shells in an inner position on the sheet transport drum at a distance from the axis of rotation of the drum being less than the distance in the outer position; providing the sheet transport drum with adjustable carriers being swinging arms of coupler mechanisms; in the first and second operating modes, carrying the drum circumferential shells with the adjustable carriers; before a start of a third of the operating modes, removing the drum circumferential shells from the sheet transport drum during a drum conversion; and in the third operating mode, rotating the sheet transport drum without the drum circumferential shells.