Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1978-07-17
1980-11-04
Tupper, Robert S.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358258, 358267, A04N 122
Patent
active
042323428
ABSTRACT:
Facsimile systems, having a plurality of uniformly spaced scanning and printing elements in a linear array along their direction of advance, are coupled by time division multiplexed signals comprising a first component representing a sequence of light levels along an image line which are sampled cyclically, a second component representing completion of one sampling cycle and beginning of another as the scanning elements advance, and a third component representing a fixed reference position which each of the scanning elements pass.
Apparatus for generating the signal includes a cyclical circuit which is illustrated by a rotary switch operated by a stepping motor having one contact for each photodetector to generate the first component and one contact to generate the second component which may also be used for the third component. The three signal components are distinguished by pulse width which is determined by dwell time on the contacts.
A facsimile receiver includes a serial to parallel register to accumulate first signal components and to release them to control printing elements when a second component is received. The second component also provides a synchronous driving frequency for the printing elements. The third component is used to generate an error signal for correcting printing element position.
REFERENCES:
patent: 3582798 (1971-06-01), Veale
patent: 3592963 (1971-07-01), Young
patent: 3622703 (1971-11-01), Ricketts
patent: 3846801 (1974-11-01), DuMont
patent: 3943525 (1976-03-01), Skala
patent: 3947627 (1976-03-01), Tanaka
patent: 3972053 (1976-07-01), Skala
patent: 4117518 (1978-09-01), Skala
Faber Alan
Tupper Robert S.
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