Defect detector

Details Defect detector Defect detector

1978-04-10

1980-01-22

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

400 54, 400703, B41J 310, B41J 2946

Patent

active

041847814

ABSTRACT:
The present invention discloses a dot printer in which means are provided for detecting deterioration of dot print elements which print characters and so on and for detecting trouble caused by a print drive circuit. Print sensing elements are placed at a suitable point of a platen corresponding to a traverse range of dot print elements which are housed within a printing head and a mechanism for driving each dot print element is provided when said dot print elements move in front of the above-said print sensing elements sensing signal is generated when said dot print elements effect printing on the print sensing elements, to indicate the existence of trouble of the print drive circuit or dot print elements.

REFERENCES:
patent: 3495070 (1970-02-01), Zissen
patent: 3500437 (1970-03-01), Foerster
patent: 3627096 (1971-12-01), Finnegan
patent: 3710913 (1973-01-01), Brennan
patent: 3970184 (1976-07-01), Helmrich et al.
IBM Tech. Disc. Bulletin, F. W. Schaaf, "Serial Printer Error Correction", vol. 4, No. 11, Apr. 1962, pp. 14-15.

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