通过蜗杆、蜗轮驱动收绳轮来卷绕绳索。
It winds rope through worm and collecting rope wheel of worm device.
蜗轮箱内蜗轮轴上装有收绳轮和计数器，计算绳索的长度。
Worm shaft of worm-gear box fixes collecting rope wheel and counter so that count rope length.
确保者有注意，收绳并往后跑，也会帮攀爬者避开撞击地面的状况。
An attentive belayer can also save a climber from hitting the ground by taking the rope in and running backwards.
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