Abstract: A sound cine camera with a cassette-receiving compartment, in which a pinch roller is movable toward a continuously rotating capstan to drive a motion-picture film, is provided with a manually operable control member whose displacement into an off-normal position, against the force of a restoring spring, prepared or completes an energizing circuit for the film drive. The control member is linked with a pinch-roller support through a releasable coupling which remains effective only as long as the compartment cover or a latch thereof is in a closure position. Clamping pressure is exerted upon the pinch roller by a biasing spring engaging its support and acting upon the control member through a camming or toggle mechanism which reduces the holding force required to maintain that pressure when the control member is in its off-normal position.

Abstract: A cine camera for taking talking pictures, in which a film is moved intermittently past an image gate by a reciprocating traction claw and continuously past a recording head by a rotating capstan coacting with a pinch roller, includes a latch by which the pinch roller can be held spaced from the capstan in an inactive position. The latching of the pinch roller in this inactive position, against the force of a biasing spring providing the necessary contact pressure during filming, is accomplished upon deactivation of the film drive by the residual kinetic energy of an inertial mass such as a flywheel which is coupled with either the capstan drive or the claw drive. The latch is released upon actuation of a trigger, either directly or through the intermediary of the claw drive. The biasing spring may be part of a toggle mechanism tripped by a presetting member, such as a sensor detecting the presence of a sound-film cassette in the camera.