Abstract: The invention relates to a gripper system (100) for a cylinder (3) of a sheet-fed printing press (1) which guides sheets and which is used to detect printed sheets. Said system comprises a gripping shaft (9) and grippers (8) which are arranged on the gripper shaft (9) and which, during a synchronised normal operation, can be introduced into a cylinder channel of a cylinder (3) which guides the sheet, by means of a pivoting movement of gripper shaft (9), such that the gripper (8) is arranged completely in the cylinder contour after pivoting. According to the invention, the gripper system (100) can be displaced in a radial manner during a cylinder phase displacement such that the grippers (8) of the gripper system (100) enter into a recess and strike an elastically mounted gripper strike bar (10) which enables the gripper (8) to be struck during the radial displacement of the gripper system (100).