We have this table-top Xerox machine we got from Staples.
Worked just fine for a couple of years.
Now, however, it has a hard time grabbing the next piece of blank paper -- grabs two, then ERROR.
Pain in the butt!
I've adopted a scheme of BY HAND feeding paper into it.
Total of two pieces in the feeder, the 2nd one of them between my fingers.
Assuming the first one has "gone down" that half-inch before it gets pulled through,
I then press "copy" (or whatever the button is called) (number of copies set to 1), and as that sheet gets pulled into the machine, I make sure that the one between my fingers actually does go down that half-inch *it* has to, before its turn.
ie, a sheet of paper must, while the prior sheet is being pulled into the machine, get grabbed (by the machine) for the purpose of having it drop (or get pulled) down .5 inch or so, so its ready for the NEXT print-cycle, when it's *its* turn to get pulled through.
When things are working properly, this all happens automatically -- the machine takes care of that preparatory step.
But now it no longer does -- the only way to get that step done is for ME to do it.