Worm shaft of worm-gear box fixes collecting rope wheel and counter so that count rope length.
蜗轮箱内蜗轮轴上装有收绳轮和计数器，计算绳索的长度。
Everything is driven by the big gear: when it rotates counter-clockwise (with respect to the photos above) the cams push the arm up while the grabber opens wide.
一切都是由那个大齿轮控制的：当它逆时针运动时，手臂被打开；
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