Method and apparatus for facsimile scanning

Details Method and apparatus for facsimile scanning Method and apparatus for facsimile scanning

1975-10-14

1978-05-30

Dobeck, B.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318318, 318 72, 358275, G05B 106

Patent

active

040925765

ABSTRACT:
A facsimile transceiver comprises a rotatably mounted drum and an information transducer juxtaposed to the drum for marking on a copy medium carried by the drum or detecting dark-light variations in a document carried by the drum. The drum is driven by a DC motor with the speed of the motor controlled by a phase locked loop in which the phase and frequency of reference pulses are compared with the phase and frequency of pulses having a frequency proportional to the speed of rotation of the drum.

REFERENCES:
patent: 2230821 (1941-02-01), Artzt
patent: 3231807 (1966-01-01), Willis
patent: 3622703 (1971-11-01), Ricketts et al.
patent: 3885206 (1975-05-01), Hort
patent: 3906319 (1975-09-01), Milligan
patent: 3952237 (1976-04-01), Kimizuka

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