发明授权
US5683053A Cine-video film transport apparatus having film supply and take-up reels between which the film is driven at a speed varied in accordance with changes in the outer diameter of the film being unwound from one of the reels 失效
电影胶片输送装置具有胶片供应和卷取卷轴,薄膜在其之间以根据从其中一个卷轴展开的薄膜外径的变化而变化的速度驱动

Cine-video film transport apparatus having film supply and take-up reels
between which the film is driven at a speed varied in accordance with
changes in the outer diameter of the film being unwound from one of the
reels
摘要:
Film transport apparatus for a cine-video system in which video signals are produced from film that is driven between supply and take-up reels. The film, which may be wound in A or B configuration on each reel, is threaded automatically about a film drive mechanism which transports the film from the supply reel, through a film gate to the take-up reel. Tensioning apparatus imparts tension to the film at the entry and exit of the film gate which, during the threading operation, causes the respective reels to rotate before film actually is transported therebetween. The direction in which each reel rotates to unwind film therefrom when tension is imparted serves to identify whether the film is wound in A or B configuration. Advantageously, a programmable processor controls the film transport speed in response to a user-actuated knob; and this same processor serves to detect when the film approaches its end on the supply or take-up reel.
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