The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 1977
Filed:
Apr. 12, 1976
John M Vandling, Pleasantville, NY (US);
Exxon Research and Engineering Company, Linden, NJ (US);
Abstract
In a facsimile system, rotation of a transmitter drum carrying a document is synchronized with the rotation of a receiver drum carrying a copy medium. Synchronization is achieved by rotating the transmitter drum at a substantially constant angular frequency while generating transmitter synchronizing pulses corresponding to that frequency and rotating the receiver drum at an initial angular frequency while generating receiver synchronizing pulses corresponding to the initial frequency where the initial frequency of the receiver drum differs substantially from the constant frequency of the transmitter drum. When partial coincidence between portions of a transmitter synchronizing pulse and the receiver drum synchronizing pulse is detected, the receiver drum is rotated at another frequency closer to the constant frequency of the transmitter drum. When a reversal in the lead-lag relationship between the transmitter synchronizing pulse and the receiver drum synchronizing pulse corresponding to substantial coincidence between the synchronizing pulses is detected, the receiver drum is driven at the constant angular frequency of the transmitter drum.