Mark sensing apparatus

Details Mark sensing apparatus Mark sensing apparatus

1978-05-09

1980-04-01

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

35 48B, 235462, G06K 706, G06K 710, G09B 2300

Patent

active

041957725

ABSTRACT:
A mark sensing apparatus for detecting the presence of electrically conductive mark traces at designated files on a mark sheet. A plurality of thin, insulated electrically conductive brushes contact each mark file. The brushes are arranged as interleaved pairs, with alternated brushes interconnected. The presence of a mark shortcircuits at least one of the brush pairs, and resulted in a detectable current pulse. A current waveform connected to the interconnected brush pairs produces an undistorted waveform whenever the brush pairs are short circuited.

REFERENCES:
patent: 1573174 (1926-02-01), Lasker
patent: 3209471 (1965-10-01), Brittan
patent: 3509324 (1970-04-01), Shaw
patent: 3542287 (1970-11-01), Schena
patent: 3631611 (1972-01-01), Abell
patent: 3749887 (1973-07-01), Giuliani
patent: 4095091 (1978-06-01), Nakano
patent: 4104682 (1978-08-01), Lehner

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