typewriter

Devices {typewriter}| can print letters.

roller

A roller {platen} can rotate to move paper forward and back. Roller can slide back and forth, to allow typing anywhere on line.

process

When a key depresses, a lever moves type bar onto paper on platen. Shift key raises or lowers type bar to allow uppercase or lowercase letters to strike. Levers have angles so keys hit at same position. Depressing a key can rotate a wheel of raised letters into position for a hammer to strike from behind. Depressing a key can rotate a ball of raised letters into position for pressing against platen.

slide

When type bar, wheel, or ball returns to normal position, it hits a release lever that springs platen one space to right.

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Date Modified: 2022.0224