公开(公告)号：WO1989001145A1

公开(公告)日：1989-02-09

申请号：PCT/US1988002510

申请日：1988-07-21

Applicant: STORAGE TECHNOLOGY CORPORATION

Inventor： STORAGE TECHNOLOGY CORPORATION ,  FRENCH, Andrew, J. ,  FORD, James ,  FLENNER, Thomas ,  KLEIN, Schnitz, Thomas ,  COMSTOCK, Robert

IPC: G01N21/86

CPC classification number: B41J17/36

Abstract: An adjustable optical ribbon edge sensor (40) having a relatively short throat (60) for ease of loading a towel ribbon (22) in a high-speed line printer (10) includes one or more pairs of photosensitive switches (66), coupled through a variable resistor (74), to a comparator (76) facilitates accurate and repeated detection of the ribbon (22) edge regardless of the color of the ribbon (22). By adjusting the variable resistor (74), the comparator (76) is biased for the particular color ribbon (22) in use.