Printing unit having a throw-off configuration which allows the risks of damage to the cylinders caused by winding the web of paper to be limited and corresponding printing press

A printing unit for printing a web of paper comprising:

• a frame;
• at least a first printing group and second printing group, the first printing group including a first blanket cylinder and a first plate cylinder, the second printing group including a second blanket cylinder and a second plate cylinder;
• and
• a cylinder support and movement mechanism moving the printing unit into at least one throw-on configuration and at least one throw-off configuration;
• the support and movement mechanism including at least one element including a region designed to have a lesser strength so as to break under a predetermined force wherein the predetermined force is the force applied to each of either the first plate and blanket cylinders or the second plate and blanket cylinders when a wound web completely fills a space between either the first plate and blanket cylinders or the second plate and blanket cylinders and the at least one element connects either the first plate and blanket cylinder or the second plate and blanket cylinder,
• the at least one throw-on configuration occurring when the first blanket cylinder is pressed against the second blanket cylinder and the first and second blanket cylinders are pressed against the first and second plate cylinders respectively,
• the at least one throw-off configuration occurring when the first blanket cylinder is spaced apart from the second blanket cylinder.