Loading patent…
AssigneeDe La Rue Giori S.A.
InventorsGualtiero Giori, Albrecht J. Germann
Estimating the term…
The printing machine has a multi-color offset printing unit, behind this a sheet conveying device, and an intaglio printing unit to which the sheets printed and provided with register marks in the first printing unit are transferred by the conveying device. The conveying device comprises a detector system responding to these register marks, and a register drum. Each of the two printing units and the register drum have their own drive mechanisms mechanically independent of each other. The drive mechanism for the second printing unit is controlled in dependence upon the speed of the first printing unit, and the drive mechanism for the register drum is controlled on the one hand in dependence upon the speed of the second printing unit and on the other hand in dependence upon the register deviation measured in the circumferential direction. Further, on the register drum are disposed devices for correcting side register and any skew of a sheet in dependence upon the measured register deviations. A second detector system reads the position of the abovementioned register marks relative to further register marks applied in the intaglio printing unit, and if necessary performs fine correction of register.
Combined sheet fed rotary printing machine for securities, in particular bank-notes, comprising a first printing unit, a second printing unit formed by an intaglio printing unit, and a conveying device connecting the two printing units for transferring the sheets, said printing units each have an independent drive mechanism without a continuous longitudinal shaft, the drive mechanism of the second printing unit being controlled in dependence upon the speed of the first printing unit, a detector system mounted in the conveying zone and being equipped with measuring heads which respond to register marks applied to the sheets in the first printing unit and detect register deviations in the circumferential direction and in the lateral direction, and a register correcting device, located between the detector system and the second printing unit, said device comprises a register drum and is arranged to correct the position of the sheets in dependence upon the measured register deviations.
Dependencies are inferred from the claim text.