Circuit for the Prevention of Errors Due to the Contamination of the Timing Holes in the Dot Element Band in a Dot Element Band Printer
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
A dot element band printer includes a transducer for sensing timing holes in the dot element band and generating corresponding timing signals. In order to avoid errors in the operation of the printer due to the absence of a timing signal from a blocked timing hole, the printer also includes an error-prevention circuit which allows the printer to continue to operate even though one or more of the timing holes is blocked by paper dust or pieces of ink ribbon. Fig. 1 illustrates a portion of the dot print element band 1 of a printer. The band 1 is formed with a plurality of chevron-shaped fingers 2 by forming holes 3 in the band 1. To the apex 4 of each finger is attached a dot printing element 5. Extending along the length of the band 1 are two rows of timing holes 7 and 8.