US PATENT SUBCLASS 400 / 309
.~.~ Backspace proportional to variable width of imprinted characters


Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

283  DF  CARRIAGE OR CARRIAGE-MOVING OR MOVEMENT-REGULATING MECHANISM {11}
308  DF  .~ Carriage backspace mechanism {4}
309.~.~ Backspace proportional to variable width of imprinted characters


DEFINITION

Classification: 400/309

Backspace proportional to variable width of imprinted characters:

(under subclass 308) Subject matter wherein the carriage* is caused to be moved in irregular or unequal increments, the increment of movement for any particular movement corresponding to a variable character-space* distance equivalent to the various widths of the character* symbols that were imprinted on the record-medium* just prior to the need for backspacing.

(1) Note. See the definition of character-space in the Glossary, section III, for a discussion of the need for variable carriage feed. This discussion is amplified in (1) Note to the definition of subclass 306. In the typewriter of this subclass the backspace distance is the same amount, but in the opposite direction, as the variable character feed, and is for the purpose of returning the carriage to exactly the same print-point* that the carriage was before a particular character was imprinted.