A type of feeder that automatically inverts two-sided originals for copying of the second side for duplex copying.

Recirculating Automatic Document Feeder

An RADF can handle double as well as single sided originals. RADFs on analogue copiers need bins in order to produce multiple sets of multi-page documents. RADFs on digital copiers donâ€(tm)t need sorter bins, providing the machine operates with scan-once/print-many technology.