ETYM French platine, from plat flat. Related to Plate, Platin.
1. The bed of a machine tool to which the work is clamped.
2. The flat plate of a printing press that presses the paper against the type.
3. The roller on a typewriter against which the keys strike.
Plate pressing paper against type in printing machine; roller of typewriter.
The cylinder in most impact printers and typewriters, around which the paper wraps and against which the print mechanism strikes the paper. The paper bail, a spring-loaded bar with small rollers, holds the paper smoothly against the platen just above the print mechanism.