High-speed facsimile with electrostatic recording

Herein is reported a newly developed high-speed facsimile receiver for use over a wide-band transmission line of up to 48 kHz. The main feature of this equipment is low cost and high speed obtained by mechanical scanning. Good quality electrostatic recording has been achieved at a speed of up to 4000 line scans per minute. The circle-to-line converting multistylus made by printed circuit technology is used for the recording head. A single torsional spring-type rotating wire brush is driven directly by a high-frequency multipole hysteresis motor; thus good contact and smooth operation are obtained with light pressure at high scanning speed.