I want to know the answer to the following question:
In scanners, what do stepper motors move?
All the background I'm provided with is that "Likewise, many computer plotters (which since the early 1990s have been replaced with large-format inkjet and laser printers) used rotary stepper motors for pen and platen movement; the typical alternatives here were either linear stepper motors or servomotors with closed-loop analog control systems.". Is that enough to answer the question?