US PATENT SUBCLASS 400 / 697.1
.~.~.~ With drive for ribbon having coating thereon

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

679  DF  MEANS AUXILIARY TO TYPEWRITING FUNCTION {12}
695  DF  .~ Means for correcting typing errors (e.g., by abrasive eraser, etc.) {5}
697  DF  .~.~ By overprinting (e.g, with coated material) to cancel error {1}
697.1.~.~.~ With drive for ribbon having coating thereon

DEFINITION

Classification: 400/697.1

With drive for ribbon having coating thereon:

(under subclass 697) Subject matter wherein the specially prepared tape is wound on a spool and the tape is advanced relative to the record-medium*.

(1) Note. In some typewriters of this subclass the correction by overprinting is performed by depressing a single key* element (identified by some term indicating correction), which effects the following actions: (a) the carriage* is backspaced one character-space*, (b) the ribbon*, which has an inking field and a coated field, is shifted so as to move the inking field out of imprinting position and move the coating field into imprint position, and (c) the carriage-feed mechanism is made temporarily ineffective (i.e., "silenced"). Then (a) the improperly used type-face* will be restruck to coat the incorrect character* with pigment that is the color of the record-medium, but the carriage will not be character-spaced, (b) the ribbon will be reshifted so that the inking field will overlie the print-point*, and (c) the correct type-face will be actuated which will imprint the correct character and character-space on the carriage.