Capacitive metering means for uniform ribbon feed and take-up me

Details Capacitive metering means for uniform ribbon feed and take-up me Capacitive metering means for uniform ribbon feed and take-up me

1981-04-30

1984-10-09

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400208, 400225, B41J 3314

Patent

active

044758294

ABSTRACT:
Apparatus for feeding ribbon in an impact printer or typewriter is provided in which the ribbon metering means are very simple and minimize the potential for damage to the ribbon. Ribbon is fed from a supply reel to a take-up reel each of which is adapted to support a portion of an inventory of ribbon running from the supply reel to the take-up reel. The apparatus includes a drive mechanism which drives the take-up reel at a selected one of a plurality of different rotational velocities, apparatus for sensing the portion of the inventory of ribbon on one of the reels and for producing an electrical signal representative of the radius of said portion, and apparatus for selecting one of said rotational velocities in response to said signal. The sensing apparatus used to sense the portion of the ribbon inventory which remains on the supply reel is capacitive sensing apparatus.

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