Method and apparatus for driving facsimile transceivers

Details Method and apparatus for driving facsimile transceivers Method and apparatus for driving facsimile transceivers

1975-10-14

1979-03-27

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358264, H04N 136

Patent

active

041469089

ABSTRACT:
In a facsimile system, rotation of a transmitter drum carrying a document is synchronized with the rotation of a receiver drum carrying a copy medium. Synchronization of the rotating transmitter drum and the rotating receiver drum is assured by driving the transmitter drum from an AC power line and locking the receiver drum to the AC power line frequency once synchronization of the transmitter drum and the receiver drum have been achieved. In order to achieve initial synchronization, the drive for the receiver drum is initially locked to a source of controlled frequency until a predetermined angular position of the receiver drum relative to a predetermined angular position of the transmitter drum is attained. The receiver motor which is of the DC type is controlled in angular frequency after initial synchronization by generating a signal having a frequency phase locked to the AC power line frequency.

REFERENCES:
patent: 2250284 (1941-07-01), Wendt
patent: 2556970 (1951-06-01), McFarlane
patent: 2722564 (1955-11-01), McFarlane
patent: 2835733 (1958-05-01), Smith
patent: 3129390 (1964-04-01), March et al.
patent: 3313884 (1967-04-01), Hackenberg et al.
patent: 3622703 (1971-11-01), Ricketts et al.
patent: 3794760 (1974-02-01), Moriki

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