Noun
typebar (plural typebars)
In some typewriters, an arm actuated by pressing the keys that carried the type to strike the ribbon to form a letter.
A "noiseless" typewriter has a complex lever mechanism that decelerates the typebar mechanically before pressing it against the ribbon and paper in an attempt to dampen the noise. Source: Internet
Before the shift key, typewriters had to have a separate key and typebar for upper-case letters; in essence, the typewriter had two keyboards, one above the other. Source: Internet
By the 1970s, IBM had succeeded in establishing the Selectric as the de facto standard typewriter in mid- to high-end office environments, replacing the raucous "clack" of older typebar machines with the quieter sound of gyrating typeballs. Source: Internet
Either mechanism caused a different portion of the typebar to come in contact with the ribbon/platen. Source: Internet
It used a traditional typebar mechanism, not the "golfball" IBM Selectric typewriter mechanism, which was not introduced until the next year. Source: Internet
The result is that each typebar could type two different characters, cutting the number of keys and typebars in half (and simplifying the internal mechanisms considerably). Source: Internet