( 12976 of 12976 ) |
United States Patent | 3,553,359 |
Dixon , et al. | January 5, 1971 |
A facsimile transmitter includes a pair of traveling scanners carried by a vertically shiftable head and alternately movable through an active or scanning stroke across a document to be reproduced as the document is fed continuously beneath the scanners. A light source carried on the head transmits a collimated beam of light toward the active scanner which directs the light downwardly onto the document to detect the shade value thereof, picks up the light reflected upwardly from the document and directs such light in a collimated beam to a photomultiplier operable to send to a reproducing recorder an electrical signal varying in proportion to changes in the intensity of the beam and the shade value of the document. At the completion of its scanning stroke, each scanner is shifted to an inactive position out of the light beam and is moved reversely through a return stroke while the other scanner is moved through a scanning stroke to direct the light from the source onto the document and then to the photomultiplier. By feeding the document beneath the scanners, documents of any length can be reproduced and, through the use of a vertically movable head, documents of various thicknesses can be reproduced. A pressure responsive actuating mechanism for lowering the head and specially constructed rollers for advancing the document insure uniform and straight line feeding of the document regardless of its thickness.
Inventors: | Dixon; Paul H. (Belvidere, IL), Darsie; Burns (Rockford, IL), Zilka; Jerry M. (Rockford, IL) |
Assignee: |
Dixon Automatic Tool, Inc.
(Rockford,
IL)
|
Appl. No.: | 04/726,409 |
Filed: | May 3, 1968 |
Current U.S. Class: | 358/496 ; 358/498 |
Current International Class: | H04N 1/00 (20060101); H04n 001/04 () |
Field of Search: | 178/7.1E,7.1,7.2E,7.6,7.6X 250/219,219F,219I,234,223,223X |
2587145 | February 1952 | Grib |
2778873 | January 1957 | Nyman |
2989586 | June 1961 | Beck et al. |