초록 ▼

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 loca

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.

대표청구항 ▼

An apparatus for detecting a document jam in a system that moves documents, said documents having first and second broad, opposite surfaces; said apparatus comprising: means located adjacent the first surface of said moving document for illuminating at least a portion of said moving document; means

An apparatus for detecting a document jam in a system that moves documents, said documents having first and second broad, opposite surfaces; said apparatus comprising: means located adjacent the first surface of said moving document for illuminating at least a portion of said moving document; means located adjacent the opposite surface of said moving document for detecting the magnitude of light that passes through translucent portions of the document as it is between said illuminating means and said detecting means; and electronic means connected to said detecting means for indicating a document jam when the translucency of said document is generally unchanged for a period of time while the document is between the illuminating means and the detecting means.