Some copy machines are already able to do double-sided copying. You put the sheet into the copy machine, it scans the page, then you open the lid again, turn the sheet, let the copier scan the second side of your document, and then you get your double-sided copy. If you want to make a big stack of double-sided copies, that is such a hassle to keep opening and closing the lid to copy just one page! It would be nice to have a copy machine which could scan both sides of a page simultaneously. Maybe that could be done through some mirror system or having another scanner in the lid of the copier? Or do such things already exist?
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There is an interesting idea here for extending the capability of a printer. If a printer could print from digital data simultaneously on both sides of a piece of paper that might save considerable time. It would also be a rather expensive machine.
The Lanier 127 in our office copies both sides.
The way copiers do double-sided copying is they copy one side of the original, then flip the paper over and copy the other side. They can also copy onto both sides of the copy. Again, they do this by using a mechanism to flip the paper over. The mechanism to do this is expensive, so only high-end copiers do this. I have access to one of these at work. It would prohibitively expensive to have two copiers in one unit, to copy both sides of an original at the same time. The mechanism to flip over the paper is much less expensive.
You want to make a lot of double-sided copies? Put your stack of source material in the tray and copy it all on one side. Then flip it over, put it back in, pull the blank paper tray, put the copies you just made in there so the machine will print side two appropriately, and hit copy.
What am I missing? Why does this not work for you?
Its called duplexing. Many printers and copiers do this already. Some printers and copiers you can just buy an extra attachment to make it happen. This often is a large point of failure and I dont recommend buying one unless you would use it alot. I work with them all the time, some of them are very old... not a new idea.