Error checking circuit for digitally controlled printers
Abstract
Abstract A CHECKING CIRCUIT IS ARRANGED TO DETECT MALFUNCTIONS IN THE OUTPUT PORTION OF A DIGITALLY CONTROLLED PRINTER WHOSE INCOMING DIGITAL CONTROL INFORMATION IS IN THE FORM OF SUCCESSIVE FIRST FRAMES HAVING N TIME SLOTS EACH. THE FIRST FRAMES ARE CONVERTED TO N PARALLEL PATHS SELECTIVELY CONTAINING COMMAND BITS FOR N SOLENOID-ACTUATED HAMMERS IN THE PRINTER. A PARALLEL PULSE PATTERN CORRESPONDING TO THOSE OF THE HAMMER SOLENOIDS ACTUALLY EXCITED IS CONVERTED TO SERIAL FORM AS SUCCESSIVE SECOND FRAMES. THE LATTER ARE COMPARED WITH THE FIRST FRAMES IN AN ANTICOINCIDENCE GATE, AND SUCCESSIVE SECOND FRAMES ARE COMPARED (AFTER A RELATIVE DELAY OF N TIME SLOTS) IN A COINCIDENCE GATE. THE OUTPUTS FROM ANTICOINCIDENCE AND COINCIDENCE GATES ARE RESPECTIVELY INDICATIVE OF IMPERFECT OPERATION OF THE HAMMER ACTUATING POWER SUPPLY AND OF ERRONEOUS DOUBLE PRINTING.
Inventors
- 👤 Jaroslav Mrkvicka
Bibliographic Details
Claims Analysis
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