Mark sensing apparatus
First Claim
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1. An apparatus for sensing electrically conductive marks on a mark file of a marked sheet comprising:
- sensing means having two input terminals for sensing a short-circuiting of the two terminals,a plurality of juxtaposed pairs of parallel and electrically conductive brushes, alternate brushes being electrically insulated from one another and electrically connected at one end to opposite input terminals of the sensing means,the separation between the centers of adjacent brushes being much less than the width of a mark file and the separation between the centers of the two end brushes in the plurality being substantially the width of a mark file,a pair of feed rollers disposed in front of the plurality of brush pairs for pinching a marked sheet and feeding the sheet to the brush pairs to enable the other ends of the plurality of brushes to slide on a mark file of the sheet;
whereby the presence of an electrically conductive mark on the mark file will cause at least two of the brushes to be short circuited and the mark will be sensed by the sensing means regardless of the length or straightness of the mark.
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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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Citations
1 Claim
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1. An apparatus for sensing electrically conductive marks on a mark file of a marked sheet comprising:
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sensing means having two input terminals for sensing a short-circuiting of the two terminals, a plurality of juxtaposed pairs of parallel and electrically conductive brushes, alternate brushes being electrically insulated from one another and electrically connected at one end to opposite input terminals of the sensing means, the separation between the centers of adjacent brushes being much less than the width of a mark file and the separation between the centers of the two end brushes in the plurality being substantially the width of a mark file, a pair of feed rollers disposed in front of the plurality of brush pairs for pinching a marked sheet and feeding the sheet to the brush pairs to enable the other ends of the plurality of brushes to slide on a mark file of the sheet; whereby the presence of an electrically conductive mark on the mark file will cause at least two of the brushes to be short circuited and the mark will be sensed by the sensing means regardless of the length or straightness of the mark.
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Specification
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Current AssigneeRicoh Denshi Kogyo Kabushiki Kaisha
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Original AssigneeRicoh Denshi Kogyo Kabushiki Kaisha
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InventorsNishimura, Yasuhiko
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Primary Examiner(s)Kilgore, Robert M.
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Application NumberUS05/904,339Time in Patent Office693 DaysField of Search235/492, 235/441, 235/442, 235/443, 35/48 B, 235/489, 235/462US Class Current235/441CPC Class CodesG06K 7/0021 for reading/sensing record ...
