US PATENT SUBCLASS 400 / 555
.~ By irregular increments of platen rotation (e.g., for adjustment of platen relative to its actuator, etc.)

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.~ By irregular increments of platen rotation (e.g., for adjustment of platen relative to its actuator, etc.) {6}
556  DF  .~.~> Including disconnecting ratchet wheel from platen (e.g., declutching ratchet, etc.) {6}
562  DF  .~.~> Including settable stops
563  DF  .~.~> Including plural detents selectively engageable with ratchet wheel
564  DF  .~.~> Including a drive member engageable with line-space ratchet wheel {1}
565  DF  .~.~> Detent-release structure {2}
567  DF  .~.~> Including gear (e.g., differential gear, etc.) structure

DEFINITION

Classification: 400/555

By irregular increments of platen rotation (e.g., for adjustment of platen relative to its actuator, etc.):

(under subclass 545) Subject matter wherein the typewriter is provided with a first mechanism for effecting normal increments of platen* rotation that correspond to normal line-space* distances for the feeding of record-medium* between successive print-line* rows, and wherein significance is attributed to a second mechanism that effects or enables rotation of the platen in other than normal increments that correspond to other than normal line-space distances for irregular feeding of record-medium.

(1) Note. The irregular platen rotation increment may enable imprinting of successive print-lines that are spaced apart by distances that are greater than or less than normal line-space distances, or may enable imprint of subscript or superscript character* symbols.