Patent ID: 8225716

Claim:
A printing unit of a printing press comprising at least two frame parts, the position of which relative to one another can be changed, wherein interacting frame parts ( 13 ; 14 ) are placed against one another along a shared joining surface ( 16 ) in a first operating position and are moved away from one another in a second operating position, wherein between frame parts ( 13 ; 14 ) that are moved away from one another in the printing unit ( 01 ), an intermediate space ( 17 ) is formed, delimited in part by said frame parts ( 13 ; 14 ), wherein of the interacting frame parts ( 13 ; 14 ), at least one frame part ( 14 ) is arranged so as to be movable along an adjustment path (S), wherein at least one sensor ( 31 ) for monitoring the intermediate space ( 17 ) is provided, having a directional characteristic ( 32 ) effective along the joining surface ( 16 ) or having a sensing zone ( 37 ) effective along the joining surface ( 16 ), wherein a control unit ( 28 ) connected to the sensor ( 31 ) is provided, characterized in that at least one first drive unit ( 23 ) is provided, wherein said drive unit ( 23 ) is assigned to at least one of the interacting frame parts ( 13 ; 14 ) in order to change said frame part from one operating position to the other operating position, wherein a control element ( 29 ), arranged in a conduit system ( 19 ) for supplying power to the first drive unit ( 23 ), is controlled by the control unit ( 28 ) on the basis of a signal from the sensor ( 31 ) that monitors the intermediate space ( 17 ), wherein the control element ( 29 ) is additionally provided for actuating the first drive unit ( 23 ) and is controlled independently from the actuation of the first drive unit ( 23 ), wherein a functional position of the control element ( 29 ), which can be selected by the control unit ( 28 ), prevents relative movement between the frame parts ( 13 ; 14 ).