Error detection in a digital printer employing type wheels

Details Error detection in a digital printer employing type wheels Error detection in a digital printer employing type wheels

1979-09-25

1981-09-29

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101110, 400 74, B41J 144

Patent

active

042916208

ABSTRACT:
A digital printer of the print wheel controlling type comprising a timing signal generator for developing type selection controlling signals (.alpha.) for selecting a desired type mounted on the print wheel, and a wheel round detection signal (.beta.) for indicating a complete one round of the print wheel. A print control circuit is provided for detecting whether the wheel round detection signal (.beta.) is developed next after the development of the type selection controlling signals (.alpha.) by a predetermined number. If the wheel round detection signal (.beta.) is not developed at a preselected timing, the print control circuit learns an erroneous printing operation, and functions to conduct a corrected printing operation.

REFERENCES:
patent: 3884144 (1975-05-01), Shimodaira
patent: 4033256 (1977-07-01), Hanaoka
patent: 4170937 (1979-10-01), Nakagaki et al.
patent: 4175488 (1979-11-01), Minowa

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