| 摘要 |
A reflex photographic apparatus incorporates an operator reflex assembly which is moved during a photographic cycle to convert an optical path from a viewing-focusing mode configuration to an exposure mode configuration. Spring means are utilized to drive the assembly, via a four-bar linkage, from the viewing mode position to an exposure mode position quickly and while minimizing elastic rebound at the termination of the movement. A motor is utilized to return the assembly to the viewing mode position following a photographic exposure. A pair of override springs interconnect two of the elements of the four-bar linkage so as to provide a lost-motion connection between the operator reflex assembly and the motor means. Should the reflex assembly be restrained during its return movement, the lost-motion connection permits the motor to complete its cycle without overloading. Further, the override springs function to provide a supplemental torque to aid in moving the operator assembly from its viewing mode position to its exposure mode position.
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