Robert A Comstock

US Patent:

47679336, Aug 30, 1988

Filed:

Jul 21, 1987

Appl. No.:

7/076060

Inventors:

Andrew J. French - Palm Bay FL
James Ford - Melbourne FL
Thomas Flenner - Melbourne FL
Robert Comstock - Sarasota FL

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G01N 2186

US Classification:

250548

Abstract:

An adjustable optical ribbon edge sensor having a relatively short throat for ease of loading a towel ribbon in a high-speed line printer includes one or more pairs of photosensitive switches, coupled through a variable resistor, to a comparator facilitates accurate and repeated detection of the ribbon edge regardless of the color of the ribbon. By adjusting the variable resistor, the comparator is biased for the particular color ribbon in use.