US PATENT SUBCLASS 400 / 219.4
.~.~.~.~ Senser received in depression in core of spool

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

191  DF  INCLUDING INTERPOSED INKING DEVICE (E.G., RIBBON) FOR RECORD-MEDIUM {15}
218  DF  .~ Ribbon-reversing mechanism {4}
219  DF  .~.~ Including means responsive to depletion of ribbon supply {4}
219.3  DF  .~.~.~ Including senser for diameter of wound ribbon {1}
219.4.~.~.~.~ Senser received in depression in core of spool

DEFINITION

Classification: 400/219.4

Sensor received in depression in core of spool:

(under subclass 219.3) Subject matter wherein the ribbon* is stored on the typewriter in convolutions around a cylindrical surface of a reel, and wherein said cylindrical surface includes an opening or cavity which receives said detecting member when all the convolutions have been exhausted from the reel.