During double weft weaving of GAMMA rapier loom, the mechanism has its speciality.
GAMMA型剑杆织机进行双纬织造时，机构设置有其特殊性。
It is usually use crochet form for weaving selvedge on gripper-projectile looms, but it leads to weft density double and thickness increased.
片梭织机上的布边通常采用钩边形式，但钩边形式使布边的纬密增大，厚度也增加，造成布边与布身不相适应，给生产造成困难。
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