US PATENT SUBCLASS 400 / 547.3
.~.~.~.~ By lever or push-rod drive for platen

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

545  DF  FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN {15}
546  DF  .~ To facilitate condensed billing (i.e., by determining a desired limit or amount of retrograde or advance platen movement) {2}
547  DF  .~.~ Including stop structure (e.g, traveling stop, etc.) {1}
547.1  DF  .~.~.~ For arresting platen at limit of both retrograde and advance movement {2}
547.3.~.~.~.~ By lever or push-rod drive for platen {2}
547.4  DF  .~.~.~.~.~> Via gear drive {2}
547.7  DF  .~.~.~.~.~> Via pawl and ratchet wheel drive {1}

DEFINITION

Classification: 400/547.3

By lever or push-rod drive for platen:

(under subclass 547.1) Subject matter wherein the rotation of the platen* in both of said directions is caused by a movable arm that is moved to-and-fro with reciprocatory or oscillatory movement, the movement of the arm in both directions being limited by contact of said abutments to correspond the arm movement to a desired degree of rotation of the platen in either direction.