Method for changing printing plates in rotary printing presses having a plurality of printing units, printing press and controller
AssigneeHeidelberger Druckmaschinen AG
InventorsMARTIN GREIVE, ALEXANDER KNABE, JOCHEN KÖRNER, JAN TEUBERT
Life of this patent
Estimating the term…
Abstract
A method for changing printing plates in rotary printing presses, including a plurality of printing units each having a plate cylinder and a dedicated drive for driving the plate cylinder independently of an associated blanket cylinder in a respective printing unit, includes moving the respective blanket cylinder at a somewhat higher circumferential speed than the associated plate cylinder while conveying one or more printing plates out of the printing unit, at least in one operating mode, during a plate changing operation. A printing press and a controller are also provided.
Claims29
A method for changing printing plates in rotary printing presses having a plurality of printing units, the method comprising the following steps:
- providing each printing unit with a blanket cylinder, a plate cylinder associated with the blanket cylinder, and a dedicated drive for driving the plate cylinder independently of the associated blanket cylinder;
- and
- during a plate changing operation, at least in one operating mode, moving a respective blanket cylinder at a higher circumferential speed than an associated plate cylinder, while conveying one or more printing plates out of the printing unit.
A printing press, comprising:
- a machine drive;
- a plurality of printing units each containing a plate cylinder and an associated blanket cylinder to be coupled to said machine drive;
- said plate cylinder having a dedicated drive for driving said plate cylinder independently of said associated blanket cylinder;
- and
- a controller for actuating said drives for said blanket cylinders and said plate cylinders in accordance with different operating modes and procedures, said controller being programmed to execute a control program to perform a step of moving at least one respective blanket cylinder at a higher circumferential speed than an associated plate cylinder, at least in one operating mode.
In a rotary printing press including a machine drive, and a plurality of printing units each having a blanket cylinder and an associated plate cylinder coupled to the machine drive and a dedicated drive for driving the plate cylinder independently of the associated a blanket cylinder, the improvement comprising:
- a controller controlling the drives of the plate cylinder and the blanket cylinder in at least one printing unit to cause the blanket cylinder to rotate at a higher circumferential speed than the associated plate cylinder, at least if a fault message for conveying one or more printing plates out of the printing unit is received in a printing plate change operating mode.
Dependencies are inferred from the claim text.