US PATENT SUBCLASS 400 / 219.3
.~.~.~ Including senser for diameter of wound ribbon

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.~.~.~ Including senser for diameter of wound ribbon {1}
219.4  DF  .~.~.~.~> Senser received in depression in core of spool

DEFINITION

Classification: 400/219.3

Including sensor for diameter of wound ribbon:

(under subclass 219) Subject matter wherein the ribbon* is stored on the typewriter accumulated in wound convolutions, and wherein said detecting means includes a detecting member which is biased against the outermost convolution in a manner such that said member moves as the number of convolutions increases or decreases and wherein the movement of said member influences the ribbon direction-changing means.