Perfect plate changes on Rapida sheetfed offset presses

On most Rapida sheetfed offset presses, plate changing is performed either fully automatically with FAPC or simultaneously with DriveTronic SPC. The highest level of automation is the facility for non-stop job changeovers (Flying JobChange) on the KBA Rapida 106. As a vital prerequisite, the function DriveTronic Plate Ident here ensures that the new plates are mounted on the press in the correct position and order. This automation option is unique to KBA-Sheetfed and contributes to further makeready savings at job changeovers, enabling saleable production to re-commence with practically no need for adjustment.

Plate detection before the change process

DriveTronic Plate Ident is a camera-based system which determines the proper positioning of the printing plates during a fully automatic plate change. Special register marks on the plate enable Plate Ident to detect the presence of a plate and at the same time to check its correct insertion into the plate clamps. If the new plates are correctly positioned in all the units to be changed, the automatic process is enabled and plate changing begins.DriveTronic Plate Ident was to date only available for presses of the Rapida 106, Rapida 145, Rapida 164 and MetalStar 3 series with DriveTronic SPC. With immediate effect, however, it is now offered as an option for all presses with FAPC plate changers. That means that the half-format presses Rapida 75 PRO and Rapida 76 can also be configured with this additional automation function for FAPC in future.

Automatic correction of the plate position

Plate Position Check is an additional function of DriveTronic Plate Ident to permit automatic correction of the plate position already before the first sheet is printed. It evaluates the relative positions of the plates and corrects the plate cylinders accordingly. In most cases, only minimal register corrections remain to be made after checking of a first sample sheet before full job production begins. Users who wish to move straight on to production without stopping to check a sample sheet are recommended to consider the inline QualiTronic ICR system.

Plate Position Check is aimed above all at print companies where plates are still punched manually. The punching accuracy of modern CtP systems is generally such that the Plate Position Check function is superfluous, provided all the plates for a given job were punched on the same device.

The right plates in the right place

While the job presetting data such as ink profiles, duct roller speeds and area coverage are being transferred to the Rapida press from the PPS system LogoTronic Professional or via CIPLinkX, DataMatrix Select checks that the new plates to be mounted actually belong to the current job or section of a job, and furthermore that the colour sequence matches the press configuration. In this way, DataMatrix Select is a further significant step towards full process management.

Any incorrect plate assignments are immediately detected and signalled to the operator. In addition, the possibilities for cost accounting after completion of a job are improved.