US PATENT SUBCLASS 400 / 308
.~ Carriage backspace mechanism

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


400 /   HD   TYPEWRITING MACHINES

283  DF  CARRIAGE OR CARRIAGE-MOVING OR MOVEMENT-REGULATING MECHANISM {11}
308.~ Carriage backspace mechanism {4}
309  DF  .~.~> Backspace proportional to variable width of imprinted characters
310  DF  .~.~> Including powered drive means
311  DF  .~.~> Including pawl and escapement wheel
312  DF  .~.~> Including pawl and escapement rack

DEFINITION

Classification: 400/308

Carriage backspace mechanism:

(under subclass 283) Subject matter wherein the carriage* is caused to be moved in a direction opposite to the typing (i.e., character-space*) direction that enables the character* symbols to be imprinted in succession, and wherein the movement in said opposite direction is regulated to occur in increments corresponding to character-space distances but in the direction opposite to the character-space direction.

(1) Note. The backspace increments may be regular (i.e., corresponding to equal character-space distances), or the backspace increments may be irregular or unequal or variable (i.e., corresponding to variable character-space distances, mechanism for which is found in subclass 303).