Mark reader with improved mark sensing heads

Details Mark reader with improved mark sensing heads Mark reader with improved mark sensing heads

1976-03-29

1977-10-04

Kilgore, Robert M.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

235 6111D, 360110, G06K 714, G06K 708, G11B 512

Patent

active

040525945

ABSTRACT:
A document reader having a pair of improved sensing heads for reading marks on both sides of a document. Each head comprises a body portion equipped to transmit radiation onto a document and sense radiation reflected back from marks on the document. A substantially transparent, ultra high molecular weight polyethylene film secured to the body portion over the transmitting and receiving apparatus shields the body portion from wear by passing documents. With the film in place it is possible to avoid wrapping the documents about the sensing heads, a procedure that is otherwise desirable for accurate mark reading, and thereby further reduce wear.

REFERENCES:
patent: 2926982 (1960-01-01), Nafius
patent: 3686466 (1972-08-01), Sato
patent: 3801776 (1974-04-01), Goeppinger
patent: 3836754 (1974-09-01), Toye
patent: 3868514 (1975-02-01), Israelsson
patent: 3912909 (1975-10-01), Harrison
patent: 3919447 (1975-11-01), Kilmer

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