Abstract: A method of automatically adjusting a printing machine which is selectively operatable in a single-side printing mode and in a two-side printing mode and includes a sheet turning drum, gripper systems and controls therefor, and a ring gear, comprises, during the adjustment from the single-side printing mode to the two-side printing mode and commencing from a first initial position, the succession of steps of adjusting the angular position of the sheet turning drum, adjusting the gripper system controls, and adjusting the angular position of the ring gear, including releasing, angularly displacing, and engaging the ring gear; and during the adjustment from the two-side printing mode to the single-side printing mode and commencing from the first initial position, the succession of steps of adjusting the angular position of the ring gear, including releasing, angularly displacing, and engaging the ring gear, adjusting the gripper systems controls, and adjusting the angular position of the sheet turning drum.

Abstract: A control system for adjusting functional elements of consecutive printing units of a multi-color, sheet-fed, rotary printing machine during its changeover from a first or face printing mode of operation to the first and second or back-up printing mode of operation. The system includes a first control circuit fed with data signals and clock pulse signals for controlling functional elements of a first printing unit, and a second control circuit for controlling functional elements of the subsequent printing unit. An auxiliary control circuit is arranged between the two control circuits and cooperates with a timing pulse adjuster which in turn is controlled by timing pulses from a timing pulse generator, from a sheet-control device and from a machine stop detecting device.