US PATENT SUBCLASS 400 / 572
.~ By pawl and ratchet wheel drive

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

545  DF  FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN {15}
572.~ By pawl and ratchet wheel drive {3}
573  DF  .~.~> Including rectilinearly movable pawl {1}
574  DF  .~.~> Including pawl carrier coaxial with ratchet wheel {1}
575  DF  .~.~> Including means to regulate pawl engagement or drive {2}

DEFINITION

Classification: 400/572

By pawl and ratchet wheel drive:

(under subclass 545) Subject matter wherein the incremental rotation of the platen* is accomplished by way of a ratchet* disc connected to the platen that is intermittently rotated step-by-step by a pawl* that is moved by an actuator when platen rotation is desired.