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Most copiers allow scanning on the flatbed or platen (the "glass") or through a document feeder. The vast majority of fax machines have an ADF, allowing the unattended sending of multi-page faxes. ADF is so ubiquitous in fax machines that some fax machine owners use the machine as a scanner, faxing
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scans both sides in one pass. The advantage of the DADF is faster speed for two-sided originals. 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).
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multi-page documents to themselves. Document feeders are described by speed, in pages per minute or ppm, and capacity, usually in a range from 10 sheets to 200.
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is a feature which takes several pages and feeds the paper one page at a time into a scanner or copier, allowing the user to
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There are two kinds of document feeders capable of two-sided (duplex) scanning: a
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scans one side of a page, then flips it and scans the other side. A
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photocopier with an automatic document feeder in use
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A scanner with a duplexing automatic document feeder
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