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 workshop manual provides detailed technical explanations of the Graphex shutter mechanism fitted to GRAFLEX cameras. Coverage includes the setting lever mechanics that cock the main lever and reset via spring tension, shutter blade operation driven by a revolving ring with precise overlap specifications, main lever function, release lever operation, and leaf lever mechanics controlling blade opening and closing cycles. The retarding action system for speeds up to 1/100 second employs wheel and pallet mechanisms, with speed cam control enabling exposure times from 1 second through 1/400 second at free boosted speed. The flash synchronization unit receives thorough explanation, including the 20 millisecond delay option and contact closure mechanisms. Practical repair guidance covers shutter speed adjustment through retard lever bending and speed cam modification, flash bulb selection matched to delay specifications, graphite lubrication procedures, and maintenance protocols for friction surfaces throughout the assembly. An annotated technical diagram illustrates the complete lever assembly and mechanical layout. Essential reference for camera technicians and restoration specialists working with vintage GRAFLEX equipment.