US PATENT SUBCLASS 400 / 567
.~.~ Including gear (e.g., differential gear, etc.) structure

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}
567.~.~ Including gear (e.g., differential gear, etc.) structure

DEFINITION

Classification: 400/567

Including gear (e.g., differential gear, etc.) structure:

(under subclass 555) Subject matter wherein said second mechanism includes at least two intermeshing and coacting toothed members that connect said first mechanism with the platen*.

(1) Note. Usually the gear drive, for example, a differential drive or a planetary gear arrangement, is used to connect the platen ratchet* wheel and the platen so as to provide for adjustment of the platen relative to the ratchet wheel.