Thanks for you memories and observations on old printers!
There the Epsons were called the "Ärztedrucker" because Doctors they used them for "carbon copy" prescriptions. Even after Laser- or Inkjetprinters were common. No carbon copy possible there. And they had to be carbon copied, for legal reasons.
The background sound resembling constant dental drilling was actually fairly painless compared to the volley of machine-gun fire that multiple high-impact printers could be sending across the room from different parts of the office.
Could be why they invented Tylenol ;)