Copiers (and printers) are astonishingly complex things, but remain prone to jams because paper kind of sucks as a material.
Nifty article here on how the problem of paper jams continues to be studied and attacked by engineers.
Why Paper Jams Persist | The New Yorker
Who you gonna call?
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When you take a good look at the mechanism, the wonder is that they work at all.
That's a nice article. Having worked at Xerox, I got a little taste of the complexity inside a xerographic copier when I got to play with some copier simulation software that (IIRC) was intended to teach new copier repairmen how to diagnose and fix problems with copiers. I can see why someone would make a career out of that stuff. But I print and copy so little these days, I haven't seen a paper jam in ages (knock wood).