An automatic document feeder (ADF) allows you to copy multi-page documents without having to lift and lower the cover for every sheet you copy. Instead, you drop a stack of originals (up to 50 pages) into the office copier feeder, press start, and the ADF automatically pulls each page through.
If you copy lots of double sided originals, you should invest in a recirculating automatic document feeder (RADF), which can flip pages inside the machine for simplified double-sided copying.
Sorting and finishing
Digital copiers can sort copied sets electronically without the use of sorter bins. Instead of separate bins, the copies are placed in a single tray at a right angle or offset from each other, allowing you to easily identify where one set ends and another begins. Bin-free sorting allows you to make unlimited sets at one time, rather than only as many sets as you have sorter bins.
You may want a finisher if you want your office copier to copy many sets of multi-page documents. The most familiar type of finisher is the automatic stapler, which can be a huge time-saver. More advanced versions include three-hole punches, saddle stitch binding, folding, and more. Finishers are optional on many machines, and usually carry an additional cost.
Paper supply
Each paper tray, cassette, pedestal, or paper feed unit is a separate paper source. The number of sources is important if you want to be able to copy onto different paper stocks, such as letterhead, legal size stock, or transparencies, without reloading the machine. Paper sources typically hold a minimum of 50 to 100 sheets, and the largest-capacity units can hold up to 3,000 sheets.
Typically, office copiers include at least one fixed-size and a couple of adjustable-size paper trays. Unfortunately, heavy paper stock often jams if you load it into a standard paper tray. To get around this problem, most copiers include a bypass tray, a special tray that provides a straight paper path for heavy paper and labels.
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