platen

noun
  1. 1

    The part of a printing press which presses the paper against the type and by which the impression is made.

  2. 2

    The part of a typewriter or printer on which the paper rests to receive an impression.

  3. 3

    The movable table of a planer or other machine tool, on which the work is fastened, and presented to the action of the tool.

  4. 4

    The flat glass surface of a scanner or photocopier on which operators place items to be scanned.

Source: https://en.wiktionary.org/wiki/platen