Patent ID: 8087440

Claim:
A device for transferring an image-forming layer from a transfer foil to a printing sheet in a sheet fed rotary printing press comprising: a supply of transfer foil having a multi-layer structure including a carrier layer and an image forming layer, an application unit for coating a side of the printing sheet with an adhesive pattern; a coating module for transferring the image-forming layer from the transfer foil to the printing sheet, the coating module including an impression cylinder and a press cylinder that define a transfer gap therebetween; a transfer foil feeding device for feeding the transfer foil to the coating unit and for delivering the transfer foil from the coating unit, the transfer foil feeding device including a drive for transporting the transfer foil in a working direction; a transfer foil guiding device for guiding the transfer foil through the transfer gap with the carrier layer in contacting relation to the press cylinder under pressure through the transfer gap with the coated side of the printing sheet in contact with the image forming layer of the transfer foil such that the image forming layer is transferred to the adhesive pattern on the printing sheet; said impression cylinder having a sheet gripper channel; said press cylinder having a covering with an outer surface in the form of fine spherical segments for preventing adhesion of the covering surface to said transfer foil, and said transfer foil feeding device being operable for controlling the feed of the transfer foil such that the feed of the transfer foil is stopped when said sheet gripper channel of the impression cylinder passes the transfer gap and the image forming layer of the transfer foil is not to be transferred in the transfer gap while the press cylinder continues to rotate in sliding fashion with the transfer foil while maintaining contact with the transfer foil.