US PATENT SUBCLASS 400 / 564
.~.~ Including a drive member engageable with line-space ratchet wheel

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.~.~ Including a drive member engageable with line-space ratchet wheel {1}
564.1  DF  .~.~.~> Via displaceable detent

DEFINITION

Classification: 400/564

Including a drive member engageable with line-space ratchet wheel:

(under subclass 555) Subject matter wherein said first mechanism for effecting normal increments of platen* rotation includes a ratchet* disc having teeth and notches on the peripheral edge thereof and being connected to the platen, a

first pawl* that engages in one of the notches between the teeth and moves to rotate the platen incrementally, and a detent (i.e., an arm having a protrusion that meshes with one of the notches to restrain rotation at the incremental position), and wherein said second mechanism for effecting other than normal increments includes either (a) a second pawl that engages in one of the notches of the ratchet and moves to rotate the platen to the extent of a partial increment, or (b) and additional means to move said first pawl to the extent of a partial increment.