platen
Noun
Meaning
The part of a printing press which presses the paper against the type and by which the impression is made.
Hence, an analogous part of a typewriter, on which the paper rests to receive an impression.
The movable table of a machine tool, as a planer, on which the work is fastened, and presented to the action of the tool; -- also called table.
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Ackerman invented nonstoparagraphing as a space-saving measure. citation When the typist comes to the end of a paragraph, they simply moved the platen down one line.
A small rotating handle is used called the 'rounce' to do this, and the impression is made with a screw that transmits pressure through the platen.
Gutenberg adapted the construction so that the pressing power exerted by the platen on the paper was now applied both evenly and with the required sudden elasticity.
In Epson printers, there is typically a large absorption pad in a pan underneath the paper feed platen.
The Selectric used a system of latches, metal tapes, and pulleys driven by an electric motor to rotate the ball into the correct position and then strike it against the ribbon and platen.
"I was experimenting," he said, "on an automatic method of recording telegraph messages on a disk of paper laid on a revolving platen, exactly the same as the disk talking-machine of to-day.