The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1979
Filed:
Dec. 02, 1977
Andrew H McMillan, Wayne, MI (US);
William B Templeton, Howell, MI (US);
Burroughs Corporation, Detroit, MI (US);
Abstract
An apparatus and process for detecting document jams in a document processing apparatus by detecting the translucency of the documents. The disclosed apparatus includes a transport path for guiding documents and drive wheels for moving the documents along the transport path. An LED light source located on one side of the transport path illuminates at least a portion of the moving document as it passes along the transport path. A phototransistor light detector located on the other side of the transport path detects light from the LED that passes through translucent portions of the document. Electronics connected to the light detector indicate a document jam when the translucency of a document is generally unchanged for a period of time while the document is between the light source and light detector. The electronics includes circuitry for detecting the presence of a document, circuitry for detecting the absence of rapid changes in document translucency and circuitry for remembering the absence of such rapid changes in document translucency.