GRAFLEX - Graphex Shutter USN ServiceNotes1950

Technical service document issued by the Naval Air Station Camera Repair School in Pensacola, Florida, dated January 1950. This comprehensive manual provides detailed explanations of the Graphex shutter mechanism used on GRAFLEX cameras. Coverage includes all internal systems: the setting lever that cocks the main lever and resets via spring tension, shutter blades driven by a revolving ring with specific overlap specifications, the main lever mechanics, release lever operation, and leaf lever function that controls blade opening and closing. Extensive sections address the retarding action system functioning up to 1/100 second using wheels and pallet mechanisms, with speed cam control enabling various exposure times from 1 second to 1/400 (free boosted speed). The syncro unit for flash synchronization is thoroughly explained, including the 20 millisecond delay option and contact closure mechanisms. Practical guidance covers shutter speed adjustment through retard lever bending and speed cam modification, flash bulb selection by delay type, graphite lubrication procedures, and maintenance protocols for friction surfaces. An annotated technical diagram illustrates the complete lever assembly and mechanical layout. Essential reference for technicians and restoration specialists working with vintage GRAFLEX photography equipment.