Method for controlling a rotary press and rotary press

A rotary press comprising at least one printing unit having at least one printing group including at least one printing and feeding cylinder for a web to be printed, a drive device for driving in rotation the or each printing and feed cylinder, and a controller controlling the drive device of the at least one printing unit to apply to the printing and feed cylinder a positive torque and a positive power for driving in rotation or a negative torque and a negative power for braking,

• the control system is adapted and programmed for driving, in normal operation, the at least one printing and feed cylinder using the associated drive device with a first torque or power and,
• performing, in the event of the web breaking, an emergency shutdown step by braking the at least one printing and feed cylinder using the associated drive device;
• and
• limiting, in the emergency shutdown step, a second torque or power driving the at least one printing and feed cylinder applied by the associated drive device, the second torque or power being limited so the at least one printing and feed cylinder does not exceed a first predetermined torque threshold or power threshold.

A method for controlling a rotary press, the rotary press including at least one printing cylinder for printing on a web and a corresponding drive device driving the at least one printing cylinder, the method comprising the steps of:

• driving the at least one printing cylinder with the drive device by applying a first torque, the first torque being a positive driving torque;
• braking the at least one printing cylinder, in an event of a web break, by applying a second torque, the second torque being a negative braking torque;
• driving the at least one printing cylinder by applying a third torque, the third torque being a positive driving torque;
• and
• limiting the third torque to a first predetermined torque threshold to reduce damage to the at least one printing cylinder.