Abstract: The scanning mechanism of facsimile transmitter and receiver units are synchronized by comparing the relative positions of each of the scanning mechanism at a particular time. A variation in the rate of the scanning motion for one of the scanning mechanisms is then initiated and this variation is continued until a predetermined time corresponding to a substantial degree of coincidence in the scanning position of each of the scanning mechanisms. The variation in the rate of the scanning motion is a substantially ramp-like function of time.

Abstract: Disclosed herein is a facsimile apparatus with an improved sheet transport means including a transport path and a feeder in the path for moving sheets along it to a scanner. A sensor is situated in the path for sensing the length of the sheets being fed to the scanner. The sensor is utilized for detecting the length of the document such that it may be removed from the scanner by engaging the trailing edge of the sheet.

Abstract: The scanning drum of a facsimile receiver carries a longitudinally extending stripe such that portions of the stripe at opposite extremities of a document carried by the drum are exposed. The width of the stripe at the exposed portion adjacent the leading edge of the document is sensed by an optical sensing head and stored in memory prior to transmitting dark/light variations in the document. The scanning of the document continues until the optical scanning head is juxtaposed to the exposed portion of the drum adjacent the trailing edge of the document. At this time, the width of the stripe is again detected and compared with the width in memory so as to verify that the scanning of the document is complete. The facsimile transmission is then terminated.