Paper wont feed through on my canon fc224 photocopier

On these fax machines the most component that gets the most usage are the feed rolls.
Even though they are hard to find and hard to reach, using a flashlight one can view the surface of the feed wheels. By inspecting the surface, they may appear to be shinny instead of the normal feed wheel surface tracks.

Either the wheels need to be replaced or cleaning the surface might get a little reliablity, eventually they may need to be replaced.

Some feed wheels have a lower or they might be on the upper part of the drive train, where they have a square rubber pad.

This is especially true with document feeders, the most common part that wears out.

These pads or, arm tips wear out and need to be replaced.
I hope this helps out.