Drum recording means with dual scanning heads

Details Drum recording means with dual scanning heads Drum recording means with dual scanning heads

1975-07-25

1977-03-01

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Recording apparatus

346138, 274 22, 358287, 358297, H04N 106

Patent

active

040103200

ABSTRACT:
An apparatus for reproducing a pattern on a recording medium has a master cylinder adapted to carry the pattern and a copy cylinder adapted to carry the recording medium. A main drive motor is connected to both the cylinders for continuously and jointly rotating them about their respective axes. First and second reader leadscrews, parallel to the master cylinder carry first and second reading means, respectively, which scan the pattern on this master cylinder along a first set of helixes. A scriber is carried on another leadscrew parallel to the copy cylinder and is connected to the reader for replicating the pattern at least once in each of a plurality of axially adjoining sections on the cylinder by marking the medium on the cylinder along a second helix extending over all of the sections. The main drive motor is connected to the main input of a differential gear train whose output is operatively connected to the first and second reader leadscrews. An auxiliary drive means is connected to an auxiliary input of this differential gear train and is effective in one operational mode to axially displace a reading means in one direction relative to the master cylinder and in another operational mode to axially displace it in the opposite direction. This auxiliary drive means is operated only to return the scanner to its starting position at the beginning of the pattern. Thus, a reading means which has completed its scan of the master cylinder is rapidly returned to its starting position while the other reading means scans the master cylinder; i.e. the master cylinder is continuously scanned.

REFERENCES:
patent: 2989586 (1961-06-01), Beck
patent: 3037074 (1962-05-01), Foll
patent: 3541245 (1970-11-01), Wilby
patent: 3770888 (1973-11-01), De Vos
patent: 3784739 (1974-01-01), De Vos

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