Mark sensing apparatus
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United States of America Patent
Stats
-
Apr 1, 1980
Grant Date -
N/A
app pub date -
May 9, 1978
filing date -
May 24, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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