Conductive brush paper position sensor

Details Conductive brush paper position sensor Conductive brush paper position sensor

1985-08-26

1987-02-10

Prescott, A. C.

Photocopying

Including fiber optics

355 3R, 355 14SH, 271258, G03G 1500

Patent

active

046419497

ABSTRACT:
The present invention is concerned with a switching element comprised of oppositely disposed conductive fiber brushes and/or brush-like elements for detecting the presence or absence of paper at various locations in a xerographic copy machine. The oppositely disposed brushes are made from poly-acrylo-nitrile, a carbon based polymer material, which can be fabricated with relatively low values of resistance. Typical fiber bundles may consist of 6000 individual fibers each of 6-10 microns in diameter. In operation each individual conductive fiber acts as a separate electrical path through which the external circuit is completed. Passage of paper through the "nip" of the fiber to fiber electrical contact opens the circuit which is easily detected through associated circuitry which indicates the presence of paper. Likewise, arrays incorporating multiple such sensor switches may be fabricated for the purpose of indicating the size of the document interrupting specific low resistance fiber-fiber switches.

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Xerox Disclosure Journal vol. 9, No. 6, Nov./Dec. 1984.

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