Automatic document feeder

In multifunction or all-in-one printers, fax machines, photocopiers and scanners, an automatic document feeder or ADF is a feature which takes several pages and feeds the paper one page at a time into a scanner or copier,[1] allowing the user to scan, and thereby copy, print, or fax, multiple-page documents without having to manually replace each page.

Most copiers allow scanning on the flatbed or platen (the "glass") or through a document feeder.

Document feeders are described by speed, in pages per minute or ppm, and capacity, usually in a range from 10 sheets to 200.

A duplexing automatic document feeder or DADF scans both sides in one pass.

RADFs and DADFs are rated in images per minute (IPM), the number of sides they can scan each minute; this may depend upon the resolution being used (rather than the maximum resolution supported).