US PATENT SUBCLASS 400 / 564.1
.~.~.~ Via displaceable detent

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

545  DF  FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN {15}
555  DF  .~ By irregular increments of platen rotation (e.g., for adjustment of platen relative to its actuator, etc.) {6}
564  DF  .~.~ Including a drive member engageable with line-space ratchet wheel {1}
564.1.~.~.~ Via displaceable detent

DEFINITION

Classification: 400/564.1

Via displaceable detent:

(under subclass 564) Subject matter wherein said second mechanism includes means to move said detent (i.e., of said first mechanism) while it is in mesh with one of the notches of said ratchet* disc in an arcuate path to the extent of a partial increment, thereby rotating the platen* to a similar extent.