Transfer printing ribbon error detection system

Details Transfer printing ribbon error detection system Transfer printing ribbon error detection system

1977-12-29

1979-02-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

73 14, G01N 2130

Patent

active

041421060

ABSTRACT:
Errors occurring during the printing of characters in an impact printer using transfer ribbon are detected by scanning the ribbon optically after the printing operation using a slit scanner and analyzing the resulting signals to determine the value of the printed character. This value is compared with the value of the character which was to be printed. If a discrepancy exists, a printing error has occurred.

REFERENCES:
patent: 3445670 (1969-05-01), Westdale
patent: 3890048 (1975-06-01), Abbondio et al.

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