JPH066371B

A device for safeguarding a rotary printing machine for printing sheets in a first form and perfector printing operation having a storage and a turning drum, first adjusting elements for adjusting a trailing drum body of the storage drum to different format sizes, second adjusting elements for adjusting the turning drum, and grippers and mechanical and electrical means for safeguarding the printing machine during a system-determined function setting includes a first coupling wheel assigned to the trailing drum body of the storage drum, a second coupling wheel mounted on a shaft journal of the turning drum, both of the coupling wheels being linked free of slippage via drive means in such a way that the second coupling wheel and the turning drum run in synchronism, the second coupling wheel being braced axially via trip cams on a disk secured to the shaft journal so that, in a case of rotation between the second coupling wheel and the turning drum due to a fault, a switching pulse is issued which releases a signal.