| 摘要 |
A trigger device for a sound motion picture camera actuates a capstan drive mechanism of the camera at an initial stage of advancing movement of a reciprocatable trigger member and claw and shutter drive mechanism of the camera simultaneously with resilient contact of a pinch roller holder with a capstan at a final stage of the advancing movement of the trigger member. A locking member releasably locking a pinch roller holder at its retracted position wherein the pinch roller is separated from the capstan, is disposed in the path of the advancing movement of the trigger member at a position wherein it is disabled by the trigger member at the final stage of the advancing movement of the trigger member. A wire spring of relatively small spring constant is engaged with the pinch roller holder and a movable member, which is in turn engageable with the trigger member upon the advancing movement of the trigger member, such that the wire spring is loaded by way of the movable member in response to the advancing movement of the trigger member, for urging the pinch roller holder towards an advanced position wherein the pinch roller is in resilient contact with the capstan. A switch is disposed in the path of the movement of the pinch roller holder so as to be activated for actuating the claw and shutter drive mechanism of the camera when the pinch roller holder is moved to its advanced position after released from the locking member.
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