Facsimile recorder framing circuit

Details Facsimile recorder framing circuit Facsimile recorder framing circuit

1979-05-09

1981-04-14

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

318 85, H04N 136

Patent

active

042623103

ABSTRACT:
A facsimile recorder has a motor driving a scanning element and also generating recorder pulses occurring proportionally to the recorder scanning speed. A circuit for synchronizing the scanning motor with incoming framing pulses of a facsimile signal comprises a first dual data type flip flop with a first output, a first input receiving the framing pulses and a second input receiving the recorder pulses. The flip flop produces a gating pulse of duration corresponding to the interval between asynchronous occurrence of framing and recorder pulses which causes transmission of power to the recorder motor during the asynchronous interval. Consequently the motor speed and hence the period of the recorder pulses are varied in proportion to asynchronism until the framing and recorder pulses are coincident when the motor is synchronous with the framing pulses.
Power is transmitted to the recorder motor at a particular frequency derived from a frequency standard. In addition to varying the time the power is transmitted the frequency of the power and hence the speed of the motor is varied by a second flip flop so as to reduce the time needed to bring the motor into synchronism with the received framing pulses.

REFERENCES:
patent: 3401321 (1968-09-01), Miki
patent: 3408547 (1968-10-01), Saeger
patent: 3408549 (1968-10-01), Shimbukuro
patent: 3430148 (1969-02-01), Miki
patent: 3582550 (1971-06-01), Latanzi
patent: 3670105 (1972-06-01), Houck
patent: 3934182 (1976-01-01), Donohue et al.

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