US PATENT SUBCLASS 400 / 307
.~.~.~ By ratchet rack and controlled pawl

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

283  DF  CARRIAGE OR CARRIAGE-MOVING OR MOVEMENT-REGULATING MECHANISM {11}
303  DF  .~ For varying carriage feed {3}
306  DF  .~.~ Proportional to variable widths of imprinted characters {4}
307.~.~.~ By ratchet rack and controlled pawl {1}
307.1  DF  .~.~.~.~> Including multiple pawls

DEFINITION

Classification: 400/307

By ratchet rack and controlled pawl:

(under subclass 306) Subject matter wherein the irregular increments of carriage* movement are caused by drive means that includes a pawl* that is oscillated and caused to move into engagement with the teeth of a ratchet* in the form of a ratchet rack.

(1) Note. The term "ratchet rack" is defined in the definition of ratchet.