Rotary imprint printing system

1. Field of the Invention The imprint printing system allows imprinter head changes on the run. A printing roller, either an offset or a flexo printing roller, has an axial channel in which one or more imprinter heads are disposed. The imprinter heads can be selectively raised out of the channel so that the print surface projects radially above the periphery of the printing roller. In a variation of the basic concept, the imprinter heads are also axially movable along the axial channel. The individual heads can thereby be brought into a printing section defined by the location at which the product is to be imprinted. The respective imprinter head is raised for printing only in the printing section, while the other heads are withdrawn into the channel.