US PATENT SUBCLASS 400 / 670.3
.~.~.~.~ By cam groove and follower

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

663  DF  LOCKING OR INTERLOCKING MECHANISM {7}
668  DF  .~ Locking means actuated in response to a condition {4}
670  DF  .~.~ End-of-page lock (e.g., responsive to preset condition) {2}
670.2  DF  .~.~.~ Including lock for platen or line-space {1}
670.3.~.~.~.~ By cam groove and follower

DEFINITION

Classification: 400/670.3

By cam groove and follower:

(under subclass 670.2) Subject matter wherein the preventing means includes a channel that is engaged by a member within the channel, which channel is formed as a helical or spiral cam and is moved by incremental rotation of a platen*, whereby the movement of the channel effects movement of the member to effect stopping of the platen.