竖钩

wén bǎn shang de kǒng yǔn xǔ xiāng yìng de shù gōu tí shēng zhè jiù què dìng le zài gòu chéng suō kǒu shí nǎ xiē jīng shā yīng gāi tí qǐ

纹板上的孔允许相应的竖钩提升，这就确定了在构成梭口时，哪些经纱应该提起。

The holes in the card permit the lifting of hooks on the machine that determine which warp yarns are to be raised in forming the shed.