When a typewriter's key is hit, a bar rises and hits a thin strip of carbon tape, this bar prints a letter, number, or symbol on the paper. A roll called a Platen supports the paper in the typewriter. When a key is hit the platen moves the paper to the left one space.
The typewriter was the start of all keyboards. It evolved into electronic typewriters and more hybrids were made. Your standard keyboard today came from the QWERTY model Sholes made.
"Typewriter." Wikipedia. Wikimedia Foundation, n.d. Web. 20 Jan. 2015.
"World Book Online Reference Center | Online Reference Book| Online Encyclopedia." World Book. N.p., n.d. Web. 20 Jan. 2015.