US PATENT SUBCLASS 400 / 575.1
.~.~.~ By movable ratchet-wheel shield

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  DF  .~ By pawl and ratchet wheel drive {3}
575  DF  .~.~ Including means to regulate pawl engagement or drive {2}
575.1.~.~.~ By movable ratchet-wheel shield

DEFINITION

Classification: 400/575.1

By movable ratchet-wheel shield:

(under subclass 575) Subject matter wherein the change in the number of steps effected by movement of the actuator is caused by an element having a surface with which the pawl* or a portion connected thereto is in contact until the pawl is moved to said first location, which element is movable so that the pawl is in contact with the surface until the pawl is moved to a second location, at which second location the pawl will engage a notch in the ratchet* disc to effect a second predetermined number of steps of platen incremental movement.