Safety device for control or regulation systems of drive units of a printing machine

Safety device for control or regulation systems of drive units of a printing machine having at least two individual sub-aggregates thereof mechanically disconnected from one another, the drive units having a plurality of motors, respective gear transmissions via which the plurality of motors are connected to the sub-aggregates for driving them in synchronous rotation, at least one measuring device for ensuring synchronous running of the sub-aggregates, and a device for controlling the rotary speed or the torque of the motors connected to the measuring device, the safety device comprising a clutch disposable between the gear transmissions of the at least two individual sub-aggregates, said clutch having clutch halves respectively connectible to the respective gear transmissions, said clutch halves having a preset rotational-angle difference therebetween at which said clutch halves are disengaged, said clutch halves being engageable with one another for transmitting torque when the preset rotational-angle difference between said clutch halves is exceeded.