| 摘要 |
The motion-picture camera includes a prime mover, a film wind-up member, and a torque-equalizing clutch arrangement coupling the film wind-up member to the prime mover for transmitting torque to the latter. The clutch arrangement includes an automatic disengaging device which automatically disengages the clutch arrangement when the torque being transmitted by the clutch arrangement exceeds a preselected value. The automatic disengaging device includes a worm wheel connected to and driving the film wind-up member, a worm screw driving the worm wheel and driven by the disengageable part of the clutch arrangement. The worm screw is so mounted that as it drives the worm wheel it simultaneously tends to move in a direction causing the disengageable part of the clutch arrangement to become disengaged. The automatic disengaging device furthermore includes a biasing spring which exerts upon the worm screw a force counteracting the tendency of the worm screw to move in the direction associated with clutch disengagement.
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