Abstract: A hydraulic drive for a multi-color, sheet-fed rotary printing machine assembled of a plurality of consecutively arranged press units each having a set of sheet-processing cylinders and gear trains interconnecting the cylinders, is constituted by the following combination:a plurality of constant-flow, radial piston type hydraulic motors directly connected for driving a cylinder in each press unit;a first hydraulic control means including a main directional control valve and an auxiliary or switching directional control valve connected between the source of pressure fluid and the hydraulic motors; anda second hydraulic control means including a control cylinder-and-piston unit assigned to each operational radial piston of the motors and controlled by the latter so as to overlap in the cross-over position of the motors both the intake port and the discharge port for working fluid.

Abstract: Method and device for positioning application rollers and printing cylinders in the printing machine during the operation with reduced machine numbers of revolutions occuring during the slow-down operation, tipping operation or hand operation, in which a precise transmission of the torque to printing units and thus accurate development of predetermined angular rotation steps is possible due to the fact that a portion of the torque of the whole initial breakaway torque is applied directly to each individual printing unit and the remaining portion of the torque required for positioning of printing cylinders and application rollers is produced by an auxiliary drive.

Abstract: A rotary sheet printing machine with a plurality of successively arranged printing mechanisms has a drive motor, a rotatable shaft extending between the printing mechanisms, a planetary transmission for each of the printing mechanisms and having a planetary gear carrier, and a worm gear transmission connecting the planetary gear carrier with a cylinder of each of the printing mechanisms.