Framing pulse generator for facsimile recorder

摘要

A facsimile recorder using an endless scanning belt which carries styli for electrically marking graphic signals on a recording web has a pulley for the belt at the finish of a scan across the web. The belt includes conductive means connected to or integral with the stylus which contacts the pulley as the stylus passes over the pulley. During the pass the stylus touches a contact adjacent the pulley thereby completing a framing pulse generating circuit through the pulley and contact. This recorder framing pulse is compared with a synchronization (sync) pulse of an incoming facsimile signal and used to synchronize the scanning belt with the signal.