US PATENT SUBCLASS 400 / 547.8
.~.~.~.~.~.~ With spring motor

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  DF  .~.~.~.~ By lever or push-rod drive for platen {2}
547.7  DF  .~.~.~.~.~ Via pawl and ratchet wheel drive {1}
547.8.~.~.~.~.~.~ With spring motor

DEFINITION

Classification: 400/547.8

With spring motor:

(under subclass 547.7) Subject matter wherein said ratchet* is joined to the platen* by way of a resilient component, a portion of which component is moved to tension the component, and another portion of which component is moved by the tension in the component to rotate the platen.

(1) Note. The spring motor of this subclass may be used to rotate the platen in a direction to feed the record-medium* (i.e., move it in line-space* direction) or to retract the record-medium (i.e., move it in a direction opposite to line-space direction).